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/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 static LIST_HEAD(nf_tables_expressions);
29 static LIST_HEAD(nf_tables_objects);
30 static LIST_HEAD(nf_tables_flowtables);
31 static LIST_HEAD(nf_tables_destroy_list);
32 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
33 static u64 table_handle;
36 NFT_VALIDATE_SKIP = 0,
41 static struct rhltable nft_objname_ht;
43 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
44 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
45 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
47 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
51 static const struct rhashtable_params nft_chain_ht_params = {
52 .head_offset = offsetof(struct nft_chain, rhlhead),
53 .key_offset = offsetof(struct nft_chain, name),
54 .hashfn = nft_chain_hash,
55 .obj_hashfn = nft_chain_hash_obj,
56 .obj_cmpfn = nft_chain_hash_cmp,
57 .automatic_shrinking = true,
60 static const struct rhashtable_params nft_objname_ht_params = {
61 .head_offset = offsetof(struct nft_object, rhlhead),
62 .key_offset = offsetof(struct nft_object, key),
63 .hashfn = nft_objname_hash,
64 .obj_hashfn = nft_objname_hash_obj,
65 .obj_cmpfn = nft_objname_hash_cmp,
66 .automatic_shrinking = true,
69 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
71 switch (net->nft.validate_state) {
72 case NFT_VALIDATE_SKIP:
73 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
75 case NFT_VALIDATE_NEED:
78 if (new_validate_state == NFT_VALIDATE_NEED)
82 net->nft.validate_state = new_validate_state;
84 static void nf_tables_trans_destroy_work(struct work_struct *w);
85 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
87 static void nft_ctx_init(struct nft_ctx *ctx,
89 const struct sk_buff *skb,
90 const struct nlmsghdr *nlh,
92 struct nft_table *table,
93 struct nft_chain *chain,
94 const struct nlattr * const *nla)
102 ctx->portid = NETLINK_CB(skb).portid;
103 ctx->report = nlmsg_report(nlh);
104 ctx->flags = nlh->nlmsg_flags;
105 ctx->seq = nlh->nlmsg_seq;
108 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
109 int msg_type, u32 size, gfp_t gfp)
111 struct nft_trans *trans;
113 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
117 trans->msg_type = msg_type;
123 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
124 int msg_type, u32 size)
126 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
129 static void nft_trans_destroy(struct nft_trans *trans)
131 list_del(&trans->list);
135 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
137 struct net *net = ctx->net;
138 struct nft_trans *trans;
140 if (!nft_set_is_anonymous(set))
143 list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
144 switch (trans->msg_type) {
146 if (nft_trans_set(trans) == set)
147 nft_trans_set_bound(trans) = true;
149 case NFT_MSG_NEWSETELEM:
150 if (nft_trans_elem_set(trans) == set)
151 nft_trans_elem_set_bound(trans) = true;
157 static int nft_netdev_register_hooks(struct net *net,
158 struct list_head *hook_list)
160 struct nft_hook *hook;
164 list_for_each_entry(hook, hook_list, list) {
165 err = nf_register_net_hook(net, &hook->ops);
174 list_for_each_entry(hook, hook_list, list) {
178 nf_unregister_net_hook(net, &hook->ops);
183 static void nft_netdev_unregister_hooks(struct net *net,
184 struct list_head *hook_list)
186 struct nft_hook *hook;
188 list_for_each_entry(hook, hook_list, list)
189 nf_unregister_net_hook(net, &hook->ops);
192 static int nf_tables_register_hook(struct net *net,
193 const struct nft_table *table,
194 struct nft_chain *chain)
196 struct nft_base_chain *basechain;
197 const struct nf_hook_ops *ops;
199 if (table->flags & NFT_TABLE_F_DORMANT ||
200 !nft_is_base_chain(chain))
203 basechain = nft_base_chain(chain);
204 ops = &basechain->ops;
206 if (basechain->type->ops_register)
207 return basechain->type->ops_register(net, ops);
209 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
210 return nft_netdev_register_hooks(net, &basechain->hook_list);
212 return nf_register_net_hook(net, &basechain->ops);
215 static void nf_tables_unregister_hook(struct net *net,
216 const struct nft_table *table,
217 struct nft_chain *chain)
219 struct nft_base_chain *basechain;
220 const struct nf_hook_ops *ops;
222 if (table->flags & NFT_TABLE_F_DORMANT ||
223 !nft_is_base_chain(chain))
225 basechain = nft_base_chain(chain);
226 ops = &basechain->ops;
228 if (basechain->type->ops_unregister)
229 return basechain->type->ops_unregister(net, ops);
231 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
232 nft_netdev_unregister_hooks(net, &basechain->hook_list);
234 nf_unregister_net_hook(net, &basechain->ops);
237 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
239 struct nft_trans *trans;
241 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
245 if (msg_type == NFT_MSG_NEWTABLE)
246 nft_activate_next(ctx->net, ctx->table);
248 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
252 static int nft_deltable(struct nft_ctx *ctx)
256 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
260 nft_deactivate_next(ctx->net, ctx->table);
264 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
266 struct nft_trans *trans;
268 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
270 return ERR_PTR(-ENOMEM);
272 if (msg_type == NFT_MSG_NEWCHAIN) {
273 nft_activate_next(ctx->net, ctx->chain);
275 if (ctx->nla[NFTA_CHAIN_ID]) {
276 nft_trans_chain_id(trans) =
277 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
281 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
285 static int nft_delchain(struct nft_ctx *ctx)
287 struct nft_trans *trans;
289 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
291 return PTR_ERR(trans);
294 nft_deactivate_next(ctx->net, ctx->chain);
299 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
300 struct nft_rule *rule)
302 struct nft_expr *expr;
304 expr = nft_expr_first(rule);
305 while (nft_expr_more(rule, expr)) {
306 if (expr->ops->activate)
307 expr->ops->activate(ctx, expr);
309 expr = nft_expr_next(expr);
313 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
314 struct nft_rule *rule,
315 enum nft_trans_phase phase)
317 struct nft_expr *expr;
319 expr = nft_expr_first(rule);
320 while (nft_expr_more(rule, expr)) {
321 if (expr->ops->deactivate)
322 expr->ops->deactivate(ctx, expr, phase);
324 expr = nft_expr_next(expr);
329 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
331 /* You cannot delete the same rule twice */
332 if (nft_is_active_next(ctx->net, rule)) {
333 nft_deactivate_next(ctx->net, rule);
340 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
341 struct nft_rule *rule)
343 struct nft_trans *trans;
345 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
349 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
350 nft_trans_rule_id(trans) =
351 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
353 nft_trans_rule(trans) = rule;
354 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
359 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
361 struct nft_flow_rule *flow;
362 struct nft_trans *trans;
365 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
369 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
370 flow = nft_flow_rule_create(ctx->net, rule);
372 nft_trans_destroy(trans);
373 return PTR_ERR(flow);
376 nft_trans_flow_rule(trans) = flow;
379 err = nf_tables_delrule_deactivate(ctx, rule);
381 nft_trans_destroy(trans);
384 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
389 static int nft_delrule_by_chain(struct nft_ctx *ctx)
391 struct nft_rule *rule;
394 list_for_each_entry(rule, &ctx->chain->rules, list) {
395 if (!nft_is_active_next(ctx->net, rule))
398 err = nft_delrule(ctx, rule);
405 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
408 struct nft_trans *trans;
410 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
414 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
415 nft_trans_set_id(trans) =
416 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
417 nft_activate_next(ctx->net, set);
419 nft_trans_set(trans) = set;
420 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
425 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
429 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
433 nft_deactivate_next(ctx->net, set);
439 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
440 struct nft_object *obj)
442 struct nft_trans *trans;
444 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
448 if (msg_type == NFT_MSG_NEWOBJ)
449 nft_activate_next(ctx->net, obj);
451 nft_trans_obj(trans) = obj;
452 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
457 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
461 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
465 nft_deactivate_next(ctx->net, obj);
471 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
472 struct nft_flowtable *flowtable)
474 struct nft_trans *trans;
476 trans = nft_trans_alloc(ctx, msg_type,
477 sizeof(struct nft_trans_flowtable));
481 if (msg_type == NFT_MSG_NEWFLOWTABLE)
482 nft_activate_next(ctx->net, flowtable);
484 nft_trans_flowtable(trans) = flowtable;
485 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
490 static int nft_delflowtable(struct nft_ctx *ctx,
491 struct nft_flowtable *flowtable)
495 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
499 nft_deactivate_next(ctx->net, flowtable);
509 static struct nft_table *nft_table_lookup(const struct net *net,
510 const struct nlattr *nla,
511 u8 family, u8 genmask)
513 struct nft_table *table;
516 return ERR_PTR(-EINVAL);
518 list_for_each_entry_rcu(table, &net->nft.tables, list,
519 lockdep_is_held(&net->nft.commit_mutex)) {
520 if (!nla_strcmp(nla, table->name) &&
521 table->family == family &&
522 nft_active_genmask(table, genmask))
526 return ERR_PTR(-ENOENT);
529 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
530 const struct nlattr *nla,
533 struct nft_table *table;
535 list_for_each_entry(table, &net->nft.tables, list) {
536 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
537 nft_active_genmask(table, genmask))
541 return ERR_PTR(-ENOENT);
544 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
546 return ++table->hgenerator;
549 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
551 static const struct nft_chain_type *
552 __nft_chain_type_get(u8 family, enum nft_chain_types type)
554 if (family >= NFPROTO_NUMPROTO ||
555 type >= NFT_CHAIN_T_MAX)
558 return chain_type[family][type];
561 static const struct nft_chain_type *
562 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
564 const struct nft_chain_type *type;
567 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
568 type = __nft_chain_type_get(family, i);
571 if (!nla_strcmp(nla, type->name))
577 struct nft_module_request {
578 struct list_head list;
579 char module[MODULE_NAME_LEN];
583 #ifdef CONFIG_MODULES
584 static int nft_request_module(struct net *net, const char *fmt, ...)
586 char module_name[MODULE_NAME_LEN];
587 struct nft_module_request *req;
592 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
594 if (ret >= MODULE_NAME_LEN)
597 list_for_each_entry(req, &net->nft.module_list, list) {
598 if (!strcmp(req->module, module_name)) {
602 /* A request to load this module already exists. */
607 req = kmalloc(sizeof(*req), GFP_KERNEL);
612 strlcpy(req->module, module_name, MODULE_NAME_LEN);
613 list_add_tail(&req->list, &net->nft.module_list);
619 static void lockdep_nfnl_nft_mutex_not_held(void)
621 #ifdef CONFIG_PROVE_LOCKING
623 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
627 static const struct nft_chain_type *
628 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
629 u8 family, bool autoload)
631 const struct nft_chain_type *type;
633 type = __nf_tables_chain_type_lookup(nla, family);
637 lockdep_nfnl_nft_mutex_not_held();
638 #ifdef CONFIG_MODULES
640 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
642 (const char *)nla_data(nla)) == -EAGAIN)
643 return ERR_PTR(-EAGAIN);
646 return ERR_PTR(-ENOENT);
649 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
650 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
651 .len = NFT_TABLE_MAXNAMELEN - 1 },
652 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
653 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
654 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
655 .len = NFT_USERDATA_MAXLEN }
658 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
659 u32 portid, u32 seq, int event, u32 flags,
660 int family, const struct nft_table *table)
662 struct nlmsghdr *nlh;
663 struct nfgenmsg *nfmsg;
665 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
666 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
668 goto nla_put_failure;
670 nfmsg = nlmsg_data(nlh);
671 nfmsg->nfgen_family = family;
672 nfmsg->version = NFNETLINK_V0;
673 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
675 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
676 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
677 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
678 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
680 goto nla_put_failure;
683 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
684 goto nla_put_failure;
691 nlmsg_trim(skb, nlh);
695 struct nftnl_skb_parms {
698 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
700 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
701 struct list_head *notify_list)
703 NFT_CB(skb).report = report;
704 list_add_tail(&skb->list, notify_list);
707 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
711 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
712 ctx->table->name, ctx->table->handle);
717 event == NFT_MSG_NEWTABLE ?
718 AUDIT_NFT_OP_TABLE_REGISTER :
719 AUDIT_NFT_OP_TABLE_UNREGISTER,
724 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
727 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
731 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
732 event, 0, ctx->family, ctx->table);
738 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
741 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
744 static int nf_tables_dump_tables(struct sk_buff *skb,
745 struct netlink_callback *cb)
747 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
748 const struct nft_table *table;
749 unsigned int idx = 0, s_idx = cb->args[0];
750 struct net *net = sock_net(skb->sk);
751 int family = nfmsg->nfgen_family;
754 cb->seq = net->nft.base_seq;
756 list_for_each_entry_rcu(table, &net->nft.tables, list) {
757 if (family != NFPROTO_UNSPEC && family != table->family)
763 memset(&cb->args[1], 0,
764 sizeof(cb->args) - sizeof(cb->args[0]));
765 if (!nft_is_active(net, table))
767 if (nf_tables_fill_table_info(skb, net,
768 NETLINK_CB(cb->skb).portid,
770 NFT_MSG_NEWTABLE, NLM_F_MULTI,
771 table->family, table) < 0)
774 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
784 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
785 const struct nlmsghdr *nlh,
786 struct netlink_dump_control *c)
790 if (!try_module_get(THIS_MODULE))
794 err = netlink_dump_start(nlsk, skb, nlh, c);
796 module_put(THIS_MODULE);
801 /* called with rcu_read_lock held */
802 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
803 struct sk_buff *skb, const struct nlmsghdr *nlh,
804 const struct nlattr * const nla[],
805 struct netlink_ext_ack *extack)
807 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
808 u8 genmask = nft_genmask_cur(net);
809 const struct nft_table *table;
810 struct sk_buff *skb2;
811 int family = nfmsg->nfgen_family;
814 if (nlh->nlmsg_flags & NLM_F_DUMP) {
815 struct netlink_dump_control c = {
816 .dump = nf_tables_dump_tables,
817 .module = THIS_MODULE,
820 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
823 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
825 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
826 return PTR_ERR(table);
829 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
833 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
834 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
837 goto err_fill_table_info;
839 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
846 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
848 struct nft_chain *chain;
851 list_for_each_entry(chain, &table->chains, list) {
852 if (!nft_is_active_next(net, chain))
854 if (!nft_is_base_chain(chain))
857 if (cnt && i++ == cnt)
860 nf_tables_unregister_hook(net, table, chain);
864 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
866 struct nft_chain *chain;
869 list_for_each_entry(chain, &table->chains, list) {
870 if (!nft_is_active_next(net, chain))
872 if (!nft_is_base_chain(chain))
875 err = nf_tables_register_hook(net, table, chain);
877 goto err_register_hooks;
885 nft_table_disable(net, table, i);
889 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
891 nft_table_disable(net, table, 0);
894 static int nf_tables_updtable(struct nft_ctx *ctx)
896 struct nft_trans *trans;
900 if (!ctx->nla[NFTA_TABLE_FLAGS])
903 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
904 if (flags & ~NFT_TABLE_F_DORMANT)
907 if (flags == ctx->table->flags)
910 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
911 sizeof(struct nft_trans_table));
915 if ((flags & NFT_TABLE_F_DORMANT) &&
916 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
917 nft_trans_table_enable(trans) = false;
918 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
919 ctx->table->flags & NFT_TABLE_F_DORMANT) {
920 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
921 ret = nf_tables_table_enable(ctx->net, ctx->table);
923 nft_trans_table_enable(trans) = true;
925 ctx->table->flags |= NFT_TABLE_F_DORMANT;
930 nft_trans_table_update(trans) = true;
931 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
934 nft_trans_destroy(trans);
938 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
940 const char *name = data;
942 return jhash(name, strlen(name), seed);
945 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
947 const struct nft_chain *chain = data;
949 return nft_chain_hash(chain->name, 0, seed);
952 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
955 const struct nft_chain *chain = ptr;
956 const char *name = arg->key;
958 return strcmp(chain->name, name);
961 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
963 const struct nft_object_hash_key *k = data;
965 seed ^= hash_ptr(k->table, 32);
967 return jhash(k->name, strlen(k->name), seed);
970 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
972 const struct nft_object *obj = data;
974 return nft_objname_hash(&obj->key, 0, seed);
977 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
980 const struct nft_object_hash_key *k = arg->key;
981 const struct nft_object *obj = ptr;
983 if (obj->key.table != k->table)
986 return strcmp(obj->key.name, k->name);
989 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
990 struct sk_buff *skb, const struct nlmsghdr *nlh,
991 const struct nlattr * const nla[],
992 struct netlink_ext_ack *extack)
994 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
995 u8 genmask = nft_genmask_next(net);
996 int family = nfmsg->nfgen_family;
997 const struct nlattr *attr;
998 struct nft_table *table;
1003 lockdep_assert_held(&net->nft.commit_mutex);
1004 attr = nla[NFTA_TABLE_NAME];
1005 table = nft_table_lookup(net, attr, family, genmask);
1006 if (IS_ERR(table)) {
1007 if (PTR_ERR(table) != -ENOENT)
1008 return PTR_ERR(table);
1010 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1011 NL_SET_BAD_ATTR(extack, attr);
1014 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1017 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1018 return nf_tables_updtable(&ctx);
1021 if (nla[NFTA_TABLE_FLAGS]) {
1022 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1023 if (flags & ~NFT_TABLE_F_DORMANT)
1028 table = kzalloc(sizeof(*table), GFP_KERNEL);
1032 table->name = nla_strdup(attr, GFP_KERNEL);
1033 if (table->name == NULL)
1036 if (nla[NFTA_TABLE_USERDATA]) {
1037 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1038 if (table->udata == NULL)
1039 goto err_table_udata;
1041 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1044 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1048 INIT_LIST_HEAD(&table->chains);
1049 INIT_LIST_HEAD(&table->sets);
1050 INIT_LIST_HEAD(&table->objects);
1051 INIT_LIST_HEAD(&table->flowtables);
1052 table->family = family;
1053 table->flags = flags;
1054 table->handle = ++table_handle;
1056 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1057 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1061 list_add_tail_rcu(&table->list, &net->nft.tables);
1064 rhltable_destroy(&table->chains_ht);
1066 kfree(table->udata);
1075 static int nft_flush_table(struct nft_ctx *ctx)
1077 struct nft_flowtable *flowtable, *nft;
1078 struct nft_chain *chain, *nc;
1079 struct nft_object *obj, *ne;
1080 struct nft_set *set, *ns;
1083 list_for_each_entry(chain, &ctx->table->chains, list) {
1084 if (!nft_is_active_next(ctx->net, chain))
1087 if (nft_chain_is_bound(chain))
1092 err = nft_delrule_by_chain(ctx);
1097 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1098 if (!nft_is_active_next(ctx->net, set))
1101 if (nft_set_is_anonymous(set) &&
1102 !list_empty(&set->bindings))
1105 err = nft_delset(ctx, set);
1110 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1111 if (!nft_is_active_next(ctx->net, flowtable))
1114 err = nft_delflowtable(ctx, flowtable);
1119 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1120 if (!nft_is_active_next(ctx->net, obj))
1123 err = nft_delobj(ctx, obj);
1128 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1129 if (!nft_is_active_next(ctx->net, chain))
1132 if (nft_chain_is_bound(chain))
1137 err = nft_delchain(ctx);
1142 err = nft_deltable(ctx);
1147 static int nft_flush(struct nft_ctx *ctx, int family)
1149 struct nft_table *table, *nt;
1150 const struct nlattr * const *nla = ctx->nla;
1153 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1154 if (family != AF_UNSPEC && table->family != family)
1157 ctx->family = table->family;
1159 if (!nft_is_active_next(ctx->net, table))
1162 if (nla[NFTA_TABLE_NAME] &&
1163 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1168 err = nft_flush_table(ctx);
1176 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1177 struct sk_buff *skb, const struct nlmsghdr *nlh,
1178 const struct nlattr * const nla[],
1179 struct netlink_ext_ack *extack)
1181 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1182 u8 genmask = nft_genmask_next(net);
1183 int family = nfmsg->nfgen_family;
1184 const struct nlattr *attr;
1185 struct nft_table *table;
1188 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1189 if (family == AF_UNSPEC ||
1190 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1191 return nft_flush(&ctx, family);
1193 if (nla[NFTA_TABLE_HANDLE]) {
1194 attr = nla[NFTA_TABLE_HANDLE];
1195 table = nft_table_lookup_byhandle(net, attr, genmask);
1197 attr = nla[NFTA_TABLE_NAME];
1198 table = nft_table_lookup(net, attr, family, genmask);
1201 if (IS_ERR(table)) {
1202 NL_SET_BAD_ATTR(extack, attr);
1203 return PTR_ERR(table);
1206 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1210 ctx.family = family;
1213 return nft_flush_table(&ctx);
1216 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1218 if (WARN_ON(ctx->table->use > 0))
1221 rhltable_destroy(&ctx->table->chains_ht);
1222 kfree(ctx->table->name);
1223 kfree(ctx->table->udata);
1227 void nft_register_chain_type(const struct nft_chain_type *ctype)
1229 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1230 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1231 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1234 chain_type[ctype->family][ctype->type] = ctype;
1235 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1237 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1239 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1241 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1242 chain_type[ctype->family][ctype->type] = NULL;
1243 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1245 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1251 static struct nft_chain *
1252 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1254 struct nft_chain *chain;
1256 list_for_each_entry(chain, &table->chains, list) {
1257 if (chain->handle == handle &&
1258 nft_active_genmask(chain, genmask))
1262 return ERR_PTR(-ENOENT);
1265 static bool lockdep_commit_lock_is_held(const struct net *net)
1267 #ifdef CONFIG_PROVE_LOCKING
1268 return lockdep_is_held(&net->nft.commit_mutex);
1274 static struct nft_chain *nft_chain_lookup(struct net *net,
1275 struct nft_table *table,
1276 const struct nlattr *nla, u8 genmask)
1278 char search[NFT_CHAIN_MAXNAMELEN + 1];
1279 struct rhlist_head *tmp, *list;
1280 struct nft_chain *chain;
1283 return ERR_PTR(-EINVAL);
1285 nla_strlcpy(search, nla, sizeof(search));
1287 WARN_ON(!rcu_read_lock_held() &&
1288 !lockdep_commit_lock_is_held(net));
1290 chain = ERR_PTR(-ENOENT);
1292 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1296 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1297 if (nft_active_genmask(chain, genmask))
1300 chain = ERR_PTR(-ENOENT);
1306 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1307 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1308 .len = NFT_TABLE_MAXNAMELEN - 1 },
1309 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1310 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1311 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1312 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1313 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1314 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1315 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1316 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1317 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1318 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1319 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1320 .len = NFT_USERDATA_MAXLEN },
1323 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1324 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1325 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1326 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1327 .len = IFNAMSIZ - 1 },
1330 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1332 struct nft_stats *cpu_stats, total;
1333 struct nlattr *nest;
1341 memset(&total, 0, sizeof(total));
1342 for_each_possible_cpu(cpu) {
1343 cpu_stats = per_cpu_ptr(stats, cpu);
1345 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1346 pkts = cpu_stats->pkts;
1347 bytes = cpu_stats->bytes;
1348 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1350 total.bytes += bytes;
1352 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1354 goto nla_put_failure;
1356 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1357 NFTA_COUNTER_PAD) ||
1358 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1360 goto nla_put_failure;
1362 nla_nest_end(skb, nest);
1369 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1370 const struct nft_base_chain *basechain)
1372 const struct nf_hook_ops *ops = &basechain->ops;
1373 struct nft_hook *hook, *first = NULL;
1374 struct nlattr *nest, *nest_devs;
1377 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1379 goto nla_put_failure;
1380 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1381 goto nla_put_failure;
1382 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1383 goto nla_put_failure;
1385 if (nft_base_chain_netdev(family, ops->hooknum)) {
1386 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1387 list_for_each_entry(hook, &basechain->hook_list, list) {
1391 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1392 hook->ops.dev->name))
1393 goto nla_put_failure;
1396 nla_nest_end(skb, nest_devs);
1399 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1400 goto nla_put_failure;
1402 nla_nest_end(skb, nest);
1409 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1410 u32 portid, u32 seq, int event, u32 flags,
1411 int family, const struct nft_table *table,
1412 const struct nft_chain *chain)
1414 struct nlmsghdr *nlh;
1415 struct nfgenmsg *nfmsg;
1417 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1418 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1420 goto nla_put_failure;
1422 nfmsg = nlmsg_data(nlh);
1423 nfmsg->nfgen_family = family;
1424 nfmsg->version = NFNETLINK_V0;
1425 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1427 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1428 goto nla_put_failure;
1429 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1431 goto nla_put_failure;
1432 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1433 goto nla_put_failure;
1435 if (nft_is_base_chain(chain)) {
1436 const struct nft_base_chain *basechain = nft_base_chain(chain);
1437 struct nft_stats __percpu *stats;
1439 if (nft_dump_basechain_hook(skb, family, basechain))
1440 goto nla_put_failure;
1442 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1443 htonl(basechain->policy)))
1444 goto nla_put_failure;
1446 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1447 goto nla_put_failure;
1449 stats = rcu_dereference_check(basechain->stats,
1450 lockdep_commit_lock_is_held(net));
1451 if (nft_dump_stats(skb, stats))
1452 goto nla_put_failure;
1456 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1457 goto nla_put_failure;
1459 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1460 goto nla_put_failure;
1463 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1464 goto nla_put_failure;
1466 nlmsg_end(skb, nlh);
1470 nlmsg_trim(skb, nlh);
1474 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1476 struct sk_buff *skb;
1478 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1479 ctx->table->name, ctx->table->handle,
1480 ctx->chain->name, ctx->chain->handle);
1482 audit_log_nfcfg(buf,
1485 event == NFT_MSG_NEWCHAIN ?
1486 AUDIT_NFT_OP_CHAIN_REGISTER :
1487 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1492 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1495 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1499 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1500 event, 0, ctx->family, ctx->table,
1507 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1510 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1513 static int nf_tables_dump_chains(struct sk_buff *skb,
1514 struct netlink_callback *cb)
1516 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1517 const struct nft_table *table;
1518 const struct nft_chain *chain;
1519 unsigned int idx = 0, s_idx = cb->args[0];
1520 struct net *net = sock_net(skb->sk);
1521 int family = nfmsg->nfgen_family;
1524 cb->seq = net->nft.base_seq;
1526 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1527 if (family != NFPROTO_UNSPEC && family != table->family)
1530 list_for_each_entry_rcu(chain, &table->chains, list) {
1534 memset(&cb->args[1], 0,
1535 sizeof(cb->args) - sizeof(cb->args[0]));
1536 if (!nft_is_active(net, chain))
1538 if (nf_tables_fill_chain_info(skb, net,
1539 NETLINK_CB(cb->skb).portid,
1543 table->family, table,
1547 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1558 /* called with rcu_read_lock held */
1559 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1560 struct sk_buff *skb, const struct nlmsghdr *nlh,
1561 const struct nlattr * const nla[],
1562 struct netlink_ext_ack *extack)
1564 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1565 u8 genmask = nft_genmask_cur(net);
1566 const struct nft_chain *chain;
1567 struct nft_table *table;
1568 struct sk_buff *skb2;
1569 int family = nfmsg->nfgen_family;
1572 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1573 struct netlink_dump_control c = {
1574 .dump = nf_tables_dump_chains,
1575 .module = THIS_MODULE,
1578 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1581 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1582 if (IS_ERR(table)) {
1583 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1584 return PTR_ERR(table);
1587 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1588 if (IS_ERR(chain)) {
1589 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1590 return PTR_ERR(chain);
1593 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1597 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1598 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1599 family, table, chain);
1601 goto err_fill_chain_info;
1603 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1605 err_fill_chain_info:
1610 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1611 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1612 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1615 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1617 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1618 struct nft_stats __percpu *newstats;
1619 struct nft_stats *stats;
1622 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1623 nft_counter_policy, NULL);
1625 return ERR_PTR(err);
1627 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1628 return ERR_PTR(-EINVAL);
1630 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1631 if (newstats == NULL)
1632 return ERR_PTR(-ENOMEM);
1634 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1635 * are not exposed to userspace.
1638 stats = this_cpu_ptr(newstats);
1639 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1640 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1646 static void nft_chain_stats_replace(struct nft_trans *trans)
1648 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1650 if (!nft_trans_chain_stats(trans))
1653 nft_trans_chain_stats(trans) =
1654 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1655 lockdep_commit_lock_is_held(trans->ctx.net));
1657 if (!nft_trans_chain_stats(trans))
1658 static_branch_inc(&nft_counters_enabled);
1661 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1663 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1664 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1670 /* should be NULL either via abort or via successful commit */
1671 WARN_ON_ONCE(chain->rules_next);
1672 kvfree(chain->rules_next);
1675 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1677 struct nft_chain *chain = ctx->chain;
1678 struct nft_hook *hook, *next;
1680 if (WARN_ON(chain->use > 0))
1683 /* no concurrent access possible anymore */
1684 nf_tables_chain_free_chain_rules(chain);
1686 if (nft_is_base_chain(chain)) {
1687 struct nft_base_chain *basechain = nft_base_chain(chain);
1689 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1690 list_for_each_entry_safe(hook, next,
1691 &basechain->hook_list, list) {
1692 list_del_rcu(&hook->list);
1693 kfree_rcu(hook, rcu);
1696 module_put(basechain->type->owner);
1697 if (rcu_access_pointer(basechain->stats)) {
1698 static_branch_dec(&nft_counters_enabled);
1699 free_percpu(rcu_dereference_raw(basechain->stats));
1702 kfree(chain->udata);
1706 kfree(chain->udata);
1711 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1712 const struct nlattr *attr)
1714 struct net_device *dev;
1715 char ifname[IFNAMSIZ];
1716 struct nft_hook *hook;
1719 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1722 goto err_hook_alloc;
1725 nla_strlcpy(ifname, attr, IFNAMSIZ);
1726 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1727 * indirectly serializing all the other holders of the commit_mutex with
1730 dev = __dev_get_by_name(net, ifname);
1735 hook->ops.dev = dev;
1736 hook->inactive = false;
1743 return ERR_PTR(err);
1746 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1747 const struct nft_hook *this)
1749 struct nft_hook *hook;
1751 list_for_each_entry(hook, hook_list, list) {
1752 if (this->ops.dev == hook->ops.dev)
1759 static int nf_tables_parse_netdev_hooks(struct net *net,
1760 const struct nlattr *attr,
1761 struct list_head *hook_list)
1763 struct nft_hook *hook, *next;
1764 const struct nlattr *tmp;
1765 int rem, n = 0, err;
1767 nla_for_each_nested(tmp, attr, rem) {
1768 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1773 hook = nft_netdev_hook_alloc(net, tmp);
1775 err = PTR_ERR(hook);
1778 if (nft_hook_list_find(hook_list, hook)) {
1783 list_add_tail(&hook->list, hook_list);
1786 if (n == NFT_NETDEVICE_MAX) {
1795 list_for_each_entry_safe(hook, next, hook_list, list) {
1796 list_del(&hook->list);
1802 struct nft_chain_hook {
1805 const struct nft_chain_type *type;
1806 struct list_head list;
1809 static int nft_chain_parse_netdev(struct net *net,
1810 struct nlattr *tb[],
1811 struct list_head *hook_list)
1813 struct nft_hook *hook;
1816 if (tb[NFTA_HOOK_DEV]) {
1817 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1819 return PTR_ERR(hook);
1821 list_add_tail(&hook->list, hook_list);
1822 } else if (tb[NFTA_HOOK_DEVS]) {
1823 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1828 if (list_empty(hook_list))
1837 static int nft_chain_parse_hook(struct net *net,
1838 const struct nlattr * const nla[],
1839 struct nft_chain_hook *hook, u8 family,
1842 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1843 const struct nft_chain_type *type;
1846 lockdep_assert_held(&net->nft.commit_mutex);
1847 lockdep_nfnl_nft_mutex_not_held();
1849 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1850 nla[NFTA_CHAIN_HOOK],
1851 nft_hook_policy, NULL);
1855 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1856 ha[NFTA_HOOK_PRIORITY] == NULL)
1859 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1860 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1862 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1866 if (nla[NFTA_CHAIN_TYPE]) {
1867 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1870 return PTR_ERR(type);
1872 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1875 if (type->type == NFT_CHAIN_T_NAT &&
1876 hook->priority <= NF_IP_PRI_CONNTRACK)
1879 if (!try_module_get(type->owner))
1884 INIT_LIST_HEAD(&hook->list);
1885 if (nft_base_chain_netdev(family, hook->num)) {
1886 err = nft_chain_parse_netdev(net, ha, &hook->list);
1888 module_put(type->owner);
1891 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1892 module_put(type->owner);
1899 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1901 struct nft_hook *h, *next;
1903 list_for_each_entry_safe(h, next, &hook->list, list) {
1907 module_put(hook->type->owner);
1910 struct nft_rules_old {
1912 struct nft_rule **start;
1915 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1918 if (alloc > INT_MAX)
1921 alloc += 1; /* NULL, ends rules */
1922 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1925 alloc *= sizeof(struct nft_rule *);
1926 alloc += sizeof(struct nft_rules_old);
1928 return kvmalloc(alloc, GFP_KERNEL);
1931 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1932 const struct nft_chain_hook *hook,
1933 struct nft_chain *chain)
1936 ops->hooknum = hook->num;
1937 ops->priority = hook->priority;
1939 ops->hook = hook->type->hooks[ops->hooknum];
1942 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1943 struct nft_chain_hook *hook, u32 flags)
1945 struct nft_chain *chain;
1948 basechain->type = hook->type;
1949 INIT_LIST_HEAD(&basechain->hook_list);
1950 chain = &basechain->chain;
1952 if (nft_base_chain_netdev(family, hook->num)) {
1953 list_splice_init(&hook->list, &basechain->hook_list);
1954 list_for_each_entry(h, &basechain->hook_list, list)
1955 nft_basechain_hook_init(&h->ops, family, hook, chain);
1957 basechain->ops.hooknum = hook->num;
1958 basechain->ops.priority = hook->priority;
1960 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1963 chain->flags |= NFT_CHAIN_BASE | flags;
1964 basechain->policy = NF_ACCEPT;
1965 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1966 nft_chain_offload_priority(basechain) < 0)
1969 flow_block_init(&basechain->flow_block);
1974 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1978 err = rhltable_insert_key(&table->chains_ht, chain->name,
1979 &chain->rhlhead, nft_chain_ht_params);
1983 list_add_tail_rcu(&chain->list, &table->chains);
1988 static u64 chain_id;
1990 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1991 u8 policy, u32 flags)
1993 const struct nlattr * const *nla = ctx->nla;
1994 struct nft_table *table = ctx->table;
1995 struct nft_base_chain *basechain;
1996 struct nft_stats __percpu *stats;
1997 struct net *net = ctx->net;
1998 char name[NFT_NAME_MAXLEN];
1999 struct nft_trans *trans;
2000 struct nft_chain *chain;
2001 struct nft_rule **rules;
2004 if (table->use == UINT_MAX)
2007 if (nla[NFTA_CHAIN_HOOK]) {
2008 struct nft_chain_hook hook;
2010 if (flags & NFT_CHAIN_BINDING)
2013 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2017 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2018 if (basechain == NULL) {
2019 nft_chain_release_hook(&hook);
2022 chain = &basechain->chain;
2024 if (nla[NFTA_CHAIN_COUNTERS]) {
2025 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2026 if (IS_ERR(stats)) {
2027 nft_chain_release_hook(&hook);
2029 return PTR_ERR(stats);
2031 rcu_assign_pointer(basechain->stats, stats);
2032 static_branch_inc(&nft_counters_enabled);
2035 err = nft_basechain_init(basechain, family, &hook, flags);
2037 nft_chain_release_hook(&hook);
2042 if (flags & NFT_CHAIN_BASE)
2044 if (flags & NFT_CHAIN_HW_OFFLOAD)
2047 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2051 chain->flags = flags;
2055 INIT_LIST_HEAD(&chain->rules);
2056 chain->handle = nf_tables_alloc_handle(table);
2057 chain->table = table;
2059 if (nla[NFTA_CHAIN_NAME]) {
2060 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2062 if (!(flags & NFT_CHAIN_BINDING)) {
2064 goto err_destroy_chain;
2067 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2068 chain->name = kstrdup(name, GFP_KERNEL);
2073 goto err_destroy_chain;
2076 if (nla[NFTA_CHAIN_USERDATA]) {
2077 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2078 if (chain->udata == NULL) {
2080 goto err_destroy_chain;
2082 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2085 rules = nf_tables_chain_alloc_rules(chain, 0);
2088 goto err_destroy_chain;
2092 rcu_assign_pointer(chain->rules_gen_0, rules);
2093 rcu_assign_pointer(chain->rules_gen_1, rules);
2095 err = nf_tables_register_hook(net, table, chain);
2097 goto err_destroy_chain;
2099 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2100 if (IS_ERR(trans)) {
2101 err = PTR_ERR(trans);
2102 goto err_unregister_hook;
2105 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2106 if (nft_is_base_chain(chain))
2107 nft_trans_chain_policy(trans) = policy;
2109 err = nft_chain_add(table, chain);
2111 nft_trans_destroy(trans);
2112 goto err_unregister_hook;
2118 err_unregister_hook:
2119 nf_tables_unregister_hook(net, table, chain);
2121 nf_tables_chain_destroy(ctx);
2126 static bool nft_hook_list_equal(struct list_head *hook_list1,
2127 struct list_head *hook_list2)
2129 struct nft_hook *hook;
2133 list_for_each_entry(hook, hook_list2, list) {
2134 if (!nft_hook_list_find(hook_list1, hook))
2139 list_for_each_entry(hook, hook_list1, list)
2145 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2146 u32 flags, const struct nlattr *attr,
2147 struct netlink_ext_ack *extack)
2149 const struct nlattr * const *nla = ctx->nla;
2150 struct nft_table *table = ctx->table;
2151 struct nft_chain *chain = ctx->chain;
2152 struct nft_base_chain *basechain;
2153 struct nft_stats *stats = NULL;
2154 struct nft_chain_hook hook;
2155 struct nf_hook_ops *ops;
2156 struct nft_trans *trans;
2159 if (chain->flags ^ flags)
2162 if (nla[NFTA_CHAIN_HOOK]) {
2163 if (!nft_is_base_chain(chain)) {
2164 NL_SET_BAD_ATTR(extack, attr);
2167 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2172 basechain = nft_base_chain(chain);
2173 if (basechain->type != hook.type) {
2174 nft_chain_release_hook(&hook);
2175 NL_SET_BAD_ATTR(extack, attr);
2179 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2180 if (!nft_hook_list_equal(&basechain->hook_list,
2182 nft_chain_release_hook(&hook);
2183 NL_SET_BAD_ATTR(extack, attr);
2187 ops = &basechain->ops;
2188 if (ops->hooknum != hook.num ||
2189 ops->priority != hook.priority) {
2190 nft_chain_release_hook(&hook);
2191 NL_SET_BAD_ATTR(extack, attr);
2195 nft_chain_release_hook(&hook);
2198 if (nla[NFTA_CHAIN_HANDLE] &&
2199 nla[NFTA_CHAIN_NAME]) {
2200 struct nft_chain *chain2;
2202 chain2 = nft_chain_lookup(ctx->net, table,
2203 nla[NFTA_CHAIN_NAME], genmask);
2204 if (!IS_ERR(chain2)) {
2205 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2210 if (nla[NFTA_CHAIN_COUNTERS]) {
2211 if (!nft_is_base_chain(chain))
2214 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2216 return PTR_ERR(stats);
2220 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2221 sizeof(struct nft_trans_chain));
2225 nft_trans_chain_stats(trans) = stats;
2226 nft_trans_chain_update(trans) = true;
2228 if (nla[NFTA_CHAIN_POLICY])
2229 nft_trans_chain_policy(trans) = policy;
2231 nft_trans_chain_policy(trans) = -1;
2233 if (nla[NFTA_CHAIN_HANDLE] &&
2234 nla[NFTA_CHAIN_NAME]) {
2235 struct nft_trans *tmp;
2239 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2244 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2245 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2246 tmp->ctx.table == table &&
2247 nft_trans_chain_update(tmp) &&
2248 nft_trans_chain_name(tmp) &&
2249 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2250 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2256 nft_trans_chain_name(trans) = name;
2258 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2267 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2268 const struct nlattr *nla)
2270 u32 id = ntohl(nla_get_be32(nla));
2271 struct nft_trans *trans;
2273 list_for_each_entry(trans, &net->nft.commit_list, list) {
2274 struct nft_chain *chain = trans->ctx.chain;
2276 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2277 id == nft_trans_chain_id(trans))
2280 return ERR_PTR(-ENOENT);
2283 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2284 struct sk_buff *skb, const struct nlmsghdr *nlh,
2285 const struct nlattr * const nla[],
2286 struct netlink_ext_ack *extack)
2288 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2289 u8 genmask = nft_genmask_next(net);
2290 int family = nfmsg->nfgen_family;
2291 struct nft_chain *chain = NULL;
2292 const struct nlattr *attr;
2293 struct nft_table *table;
2294 u8 policy = NF_ACCEPT;
2299 lockdep_assert_held(&net->nft.commit_mutex);
2301 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2302 if (IS_ERR(table)) {
2303 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2304 return PTR_ERR(table);
2308 attr = nla[NFTA_CHAIN_NAME];
2310 if (nla[NFTA_CHAIN_HANDLE]) {
2311 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2312 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2313 if (IS_ERR(chain)) {
2314 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2315 return PTR_ERR(chain);
2317 attr = nla[NFTA_CHAIN_HANDLE];
2318 } else if (nla[NFTA_CHAIN_NAME]) {
2319 chain = nft_chain_lookup(net, table, attr, genmask);
2320 if (IS_ERR(chain)) {
2321 if (PTR_ERR(chain) != -ENOENT) {
2322 NL_SET_BAD_ATTR(extack, attr);
2323 return PTR_ERR(chain);
2327 } else if (!nla[NFTA_CHAIN_ID]) {
2331 if (nla[NFTA_CHAIN_POLICY]) {
2332 if (chain != NULL &&
2333 !nft_is_base_chain(chain)) {
2334 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2338 if (chain == NULL &&
2339 nla[NFTA_CHAIN_HOOK] == NULL) {
2340 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2344 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2354 if (nla[NFTA_CHAIN_FLAGS])
2355 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2357 flags = chain->flags;
2359 if (flags & ~NFT_CHAIN_FLAGS)
2362 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2364 if (chain != NULL) {
2365 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2366 NL_SET_BAD_ATTR(extack, attr);
2369 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2372 flags |= chain->flags & NFT_CHAIN_BASE;
2373 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2377 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2380 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2381 struct sk_buff *skb, const struct nlmsghdr *nlh,
2382 const struct nlattr * const nla[],
2383 struct netlink_ext_ack *extack)
2385 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2386 u8 genmask = nft_genmask_next(net);
2387 int family = nfmsg->nfgen_family;
2388 const struct nlattr *attr;
2389 struct nft_table *table;
2390 struct nft_chain *chain;
2391 struct nft_rule *rule;
2397 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2398 if (IS_ERR(table)) {
2399 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2400 return PTR_ERR(table);
2403 if (nla[NFTA_CHAIN_HANDLE]) {
2404 attr = nla[NFTA_CHAIN_HANDLE];
2405 handle = be64_to_cpu(nla_get_be64(attr));
2406 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2408 attr = nla[NFTA_CHAIN_NAME];
2409 chain = nft_chain_lookup(net, table, attr, genmask);
2411 if (IS_ERR(chain)) {
2412 NL_SET_BAD_ATTR(extack, attr);
2413 return PTR_ERR(chain);
2416 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2420 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2423 list_for_each_entry(rule, &chain->rules, list) {
2424 if (!nft_is_active_next(net, rule))
2428 err = nft_delrule(&ctx, rule);
2433 /* There are rules and elements that are still holding references to us,
2434 * we cannot do a recursive removal in this case.
2437 NL_SET_BAD_ATTR(extack, attr);
2441 return nft_delchain(&ctx);
2449 * nft_register_expr - register nf_tables expr type
2452 * Registers the expr type for use with nf_tables. Returns zero on
2453 * success or a negative errno code otherwise.
2455 int nft_register_expr(struct nft_expr_type *type)
2457 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2458 if (type->family == NFPROTO_UNSPEC)
2459 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2461 list_add_rcu(&type->list, &nf_tables_expressions);
2462 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2465 EXPORT_SYMBOL_GPL(nft_register_expr);
2468 * nft_unregister_expr - unregister nf_tables expr type
2471 * Unregisters the expr typefor use with nf_tables.
2473 void nft_unregister_expr(struct nft_expr_type *type)
2475 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2476 list_del_rcu(&type->list);
2477 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2479 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2481 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2484 const struct nft_expr_type *type, *candidate = NULL;
2486 list_for_each_entry(type, &nf_tables_expressions, list) {
2487 if (!nla_strcmp(nla, type->name)) {
2488 if (!type->family && !candidate)
2490 else if (type->family == family)
2497 #ifdef CONFIG_MODULES
2498 static int nft_expr_type_request_module(struct net *net, u8 family,
2501 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2502 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2509 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2513 const struct nft_expr_type *type;
2516 return ERR_PTR(-EINVAL);
2518 type = __nft_expr_type_get(family, nla);
2519 if (type != NULL && try_module_get(type->owner))
2522 lockdep_nfnl_nft_mutex_not_held();
2523 #ifdef CONFIG_MODULES
2525 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2526 return ERR_PTR(-EAGAIN);
2528 if (nft_request_module(net, "nft-expr-%.*s",
2530 (char *)nla_data(nla)) == -EAGAIN)
2531 return ERR_PTR(-EAGAIN);
2534 return ERR_PTR(-ENOENT);
2537 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2538 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2539 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2540 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2543 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2544 const struct nft_expr *expr)
2546 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2547 goto nla_put_failure;
2549 if (expr->ops->dump) {
2550 struct nlattr *data = nla_nest_start_noflag(skb,
2553 goto nla_put_failure;
2554 if (expr->ops->dump(skb, expr) < 0)
2555 goto nla_put_failure;
2556 nla_nest_end(skb, data);
2565 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2566 const struct nft_expr *expr)
2568 struct nlattr *nest;
2570 nest = nla_nest_start_noflag(skb, attr);
2572 goto nla_put_failure;
2573 if (nf_tables_fill_expr_info(skb, expr) < 0)
2574 goto nla_put_failure;
2575 nla_nest_end(skb, nest);
2582 struct nft_expr_info {
2583 const struct nft_expr_ops *ops;
2584 const struct nlattr *attr;
2585 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2588 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2589 const struct nlattr *nla,
2590 struct nft_expr_info *info)
2592 const struct nft_expr_type *type;
2593 const struct nft_expr_ops *ops;
2594 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2597 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2598 nft_expr_policy, NULL);
2602 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2604 return PTR_ERR(type);
2606 if (tb[NFTA_EXPR_DATA]) {
2607 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2609 type->policy, NULL);
2613 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2615 if (type->select_ops != NULL) {
2616 ops = type->select_ops(ctx,
2617 (const struct nlattr * const *)info->tb);
2620 #ifdef CONFIG_MODULES
2622 if (nft_expr_type_request_module(ctx->net,
2624 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2638 module_put(type->owner);
2642 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2643 const struct nft_expr_info *info,
2644 struct nft_expr *expr)
2646 const struct nft_expr_ops *ops = info->ops;
2651 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2662 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2663 struct nft_expr *expr)
2665 const struct nft_expr_type *type = expr->ops->type;
2667 if (expr->ops->destroy)
2668 expr->ops->destroy(ctx, expr);
2669 module_put(type->owner);
2672 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2673 const struct nlattr *nla)
2675 struct nft_expr_info info;
2676 struct nft_expr *expr;
2677 struct module *owner;
2680 err = nf_tables_expr_parse(ctx, nla, &info);
2685 expr = kzalloc(info.ops->size, GFP_KERNEL);
2689 err = nf_tables_newexpr(ctx, &info, expr);
2697 owner = info.ops->type->owner;
2698 if (info.ops->type->release_ops)
2699 info.ops->type->release_ops(info.ops);
2703 return ERR_PTR(err);
2706 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2710 if (src->ops->clone) {
2711 dst->ops = src->ops;
2712 err = src->ops->clone(dst, src);
2716 memcpy(dst, src, src->ops->size);
2719 __module_get(src->ops->type->owner);
2724 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2726 nf_tables_expr_destroy(ctx, expr);
2734 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2737 struct nft_rule *rule;
2739 // FIXME: this sucks
2740 list_for_each_entry_rcu(rule, &chain->rules, list) {
2741 if (handle == rule->handle)
2745 return ERR_PTR(-ENOENT);
2748 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2749 const struct nlattr *nla)
2752 return ERR_PTR(-EINVAL);
2754 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2757 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2758 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2759 .len = NFT_TABLE_MAXNAMELEN - 1 },
2760 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2761 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2762 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2763 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2764 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2765 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2766 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2767 .len = NFT_USERDATA_MAXLEN },
2768 [NFTA_RULE_ID] = { .type = NLA_U32 },
2769 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2770 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2773 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2774 u32 portid, u32 seq, int event,
2775 u32 flags, int family,
2776 const struct nft_table *table,
2777 const struct nft_chain *chain,
2778 const struct nft_rule *rule,
2779 const struct nft_rule *prule)
2781 struct nlmsghdr *nlh;
2782 struct nfgenmsg *nfmsg;
2783 const struct nft_expr *expr, *next;
2784 struct nlattr *list;
2785 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2787 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2789 goto nla_put_failure;
2791 nfmsg = nlmsg_data(nlh);
2792 nfmsg->nfgen_family = family;
2793 nfmsg->version = NFNETLINK_V0;
2794 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2796 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2797 goto nla_put_failure;
2798 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2799 goto nla_put_failure;
2800 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2802 goto nla_put_failure;
2804 if (event != NFT_MSG_DELRULE && prule) {
2805 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2806 cpu_to_be64(prule->handle),
2808 goto nla_put_failure;
2811 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2813 goto nla_put_failure;
2814 nft_rule_for_each_expr(expr, next, rule) {
2815 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2816 goto nla_put_failure;
2818 nla_nest_end(skb, list);
2821 struct nft_userdata *udata = nft_userdata(rule);
2822 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2824 goto nla_put_failure;
2827 nlmsg_end(skb, nlh);
2831 nlmsg_trim(skb, nlh);
2835 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2836 const struct nft_rule *rule, int event)
2838 struct sk_buff *skb;
2840 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2841 ctx->table->name, ctx->table->handle,
2842 ctx->chain->name, ctx->chain->handle);
2844 audit_log_nfcfg(buf,
2847 event == NFT_MSG_NEWRULE ?
2848 AUDIT_NFT_OP_RULE_REGISTER :
2849 AUDIT_NFT_OP_RULE_UNREGISTER,
2854 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2857 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2861 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2862 event, 0, ctx->family, ctx->table,
2863 ctx->chain, rule, NULL);
2869 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2872 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2875 struct nft_rule_dump_ctx {
2880 static int __nf_tables_dump_rules(struct sk_buff *skb,
2882 struct netlink_callback *cb,
2883 const struct nft_table *table,
2884 const struct nft_chain *chain)
2886 struct net *net = sock_net(skb->sk);
2887 const struct nft_rule *rule, *prule;
2888 unsigned int s_idx = cb->args[0];
2891 list_for_each_entry_rcu(rule, &chain->rules, list) {
2892 if (!nft_is_active(net, rule))
2897 memset(&cb->args[1], 0,
2898 sizeof(cb->args) - sizeof(cb->args[0]));
2900 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2903 NLM_F_MULTI | NLM_F_APPEND,
2905 table, chain, rule, prule) < 0)
2908 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2917 static int nf_tables_dump_rules(struct sk_buff *skb,
2918 struct netlink_callback *cb)
2920 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2921 const struct nft_rule_dump_ctx *ctx = cb->data;
2922 struct nft_table *table;
2923 const struct nft_chain *chain;
2924 unsigned int idx = 0;
2925 struct net *net = sock_net(skb->sk);
2926 int family = nfmsg->nfgen_family;
2929 cb->seq = net->nft.base_seq;
2931 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2932 if (family != NFPROTO_UNSPEC && family != table->family)
2935 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2938 if (ctx && ctx->table && ctx->chain) {
2939 struct rhlist_head *list, *tmp;
2941 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2942 nft_chain_ht_params);
2946 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2947 if (!nft_is_active(net, chain))
2949 __nf_tables_dump_rules(skb, &idx,
2956 list_for_each_entry_rcu(chain, &table->chains, list) {
2957 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2961 if (ctx && ctx->table)
2971 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2973 const struct nlattr * const *nla = cb->data;
2974 struct nft_rule_dump_ctx *ctx = NULL;
2976 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2977 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2981 if (nla[NFTA_RULE_TABLE]) {
2982 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2989 if (nla[NFTA_RULE_CHAIN]) {
2990 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3004 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3006 struct nft_rule_dump_ctx *ctx = cb->data;
3016 /* called with rcu_read_lock held */
3017 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3018 struct sk_buff *skb, const struct nlmsghdr *nlh,
3019 const struct nlattr * const nla[],
3020 struct netlink_ext_ack *extack)
3022 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3023 u8 genmask = nft_genmask_cur(net);
3024 const struct nft_chain *chain;
3025 const struct nft_rule *rule;
3026 struct nft_table *table;
3027 struct sk_buff *skb2;
3028 int family = nfmsg->nfgen_family;
3031 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3032 struct netlink_dump_control c = {
3033 .start= nf_tables_dump_rules_start,
3034 .dump = nf_tables_dump_rules,
3035 .done = nf_tables_dump_rules_done,
3036 .module = THIS_MODULE,
3037 .data = (void *)nla,
3040 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3043 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3044 if (IS_ERR(table)) {
3045 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3046 return PTR_ERR(table);
3049 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3050 if (IS_ERR(chain)) {
3051 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3052 return PTR_ERR(chain);
3055 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3057 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3058 return PTR_ERR(rule);
3061 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3065 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3066 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3067 family, table, chain, rule, NULL);
3069 goto err_fill_rule_info;
3071 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3078 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3079 struct nft_rule *rule)
3081 struct nft_expr *expr, *next;
3084 * Careful: some expressions might not be initialized in case this
3085 * is called on error from nf_tables_newrule().
3087 expr = nft_expr_first(rule);
3088 while (nft_expr_more(rule, expr)) {
3089 next = nft_expr_next(expr);
3090 nf_tables_expr_destroy(ctx, expr);
3096 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3098 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3099 nf_tables_rule_destroy(ctx, rule);
3102 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3104 struct nft_expr *expr, *last;
3105 const struct nft_data *data;
3106 struct nft_rule *rule;
3109 if (ctx->level == NFT_JUMP_STACK_SIZE)
3112 list_for_each_entry(rule, &chain->rules, list) {
3113 if (!nft_is_active_next(ctx->net, rule))
3116 nft_rule_for_each_expr(expr, last, rule) {
3117 if (!expr->ops->validate)
3120 err = expr->ops->validate(ctx, expr, &data);
3128 EXPORT_SYMBOL_GPL(nft_chain_validate);
3130 static int nft_table_validate(struct net *net, const struct nft_table *table)
3132 struct nft_chain *chain;
3133 struct nft_ctx ctx = {
3135 .family = table->family,
3139 list_for_each_entry(chain, &table->chains, list) {
3140 if (!nft_is_base_chain(chain))
3144 err = nft_chain_validate(&ctx, chain);
3152 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3153 const struct nlattr *nla);
3155 #define NFT_RULE_MAXEXPRS 128
3157 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3158 struct sk_buff *skb, const struct nlmsghdr *nlh,
3159 const struct nlattr * const nla[],
3160 struct netlink_ext_ack *extack)
3162 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3163 u8 genmask = nft_genmask_next(net);
3164 struct nft_expr_info *info = NULL;
3165 int family = nfmsg->nfgen_family;
3166 struct nft_flow_rule *flow;
3167 struct nft_table *table;
3168 struct nft_chain *chain;
3169 struct nft_rule *rule, *old_rule = NULL;
3170 struct nft_userdata *udata;
3171 struct nft_trans *trans = NULL;
3172 struct nft_expr *expr;
3175 unsigned int size, i, n, ulen = 0, usize = 0;
3177 u64 handle, pos_handle;
3179 lockdep_assert_held(&net->nft.commit_mutex);
3181 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3182 if (IS_ERR(table)) {
3183 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3184 return PTR_ERR(table);
3187 if (nla[NFTA_RULE_CHAIN]) {
3188 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3190 if (IS_ERR(chain)) {
3191 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3192 return PTR_ERR(chain);
3194 if (nft_chain_is_bound(chain))
3197 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3198 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3199 if (IS_ERR(chain)) {
3200 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3201 return PTR_ERR(chain);
3207 if (nla[NFTA_RULE_HANDLE]) {
3208 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3209 rule = __nft_rule_lookup(chain, handle);
3211 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3212 return PTR_ERR(rule);
3215 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3216 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3219 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3224 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3225 nlh->nlmsg_flags & NLM_F_REPLACE)
3227 handle = nf_tables_alloc_handle(table);
3229 if (chain->use == UINT_MAX)
3232 if (nla[NFTA_RULE_POSITION]) {
3233 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3234 old_rule = __nft_rule_lookup(chain, pos_handle);
3235 if (IS_ERR(old_rule)) {
3236 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3237 return PTR_ERR(old_rule);
3239 } else if (nla[NFTA_RULE_POSITION_ID]) {
3240 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3241 if (IS_ERR(old_rule)) {
3242 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3243 return PTR_ERR(old_rule);
3248 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3252 if (nla[NFTA_RULE_EXPRESSIONS]) {
3253 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3254 sizeof(struct nft_expr_info),
3259 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3261 if (nla_type(tmp) != NFTA_LIST_ELEM)
3263 if (n == NFT_RULE_MAXEXPRS)
3265 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3268 size += info[n].ops->size;
3272 /* Check for overflow of dlen field */
3274 if (size >= 1 << 12)
3277 if (nla[NFTA_RULE_USERDATA]) {
3278 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3280 usize = sizeof(struct nft_userdata) + ulen;
3284 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3288 nft_activate_next(net, rule);
3290 rule->handle = handle;
3292 rule->udata = ulen ? 1 : 0;
3295 udata = nft_userdata(rule);
3296 udata->len = ulen - 1;
3297 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3300 expr = nft_expr_first(rule);
3301 for (i = 0; i < n; i++) {
3302 err = nf_tables_newexpr(&ctx, &info[i], expr);
3304 NL_SET_BAD_ATTR(extack, info[i].attr);
3308 if (info[i].ops->validate)
3309 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3312 expr = nft_expr_next(expr);
3315 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3316 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3317 if (trans == NULL) {
3321 err = nft_delrule(&ctx, old_rule);
3323 nft_trans_destroy(trans);
3327 list_add_tail_rcu(&rule->list, &old_rule->list);
3329 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3335 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3337 list_add_rcu(&rule->list, &old_rule->list);
3339 list_add_tail_rcu(&rule->list, &chain->rules);
3342 list_add_tail_rcu(&rule->list, &old_rule->list);
3344 list_add_rcu(&rule->list, &chain->rules);
3350 if (net->nft.validate_state == NFT_VALIDATE_DO)
3351 return nft_table_validate(net, table);
3353 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3354 flow = nft_flow_rule_create(net, rule);
3356 return PTR_ERR(flow);
3358 nft_trans_flow_rule(trans) = flow;
3363 nf_tables_rule_release(&ctx, rule);
3365 for (i = 0; i < n; i++) {
3367 module_put(info[i].ops->type->owner);
3368 if (info[i].ops->type->release_ops)
3369 info[i].ops->type->release_ops(info[i].ops);
3376 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3377 const struct nlattr *nla)
3379 u32 id = ntohl(nla_get_be32(nla));
3380 struct nft_trans *trans;
3382 list_for_each_entry(trans, &net->nft.commit_list, list) {
3383 struct nft_rule *rule = nft_trans_rule(trans);
3385 if (trans->msg_type == NFT_MSG_NEWRULE &&
3386 id == nft_trans_rule_id(trans))
3389 return ERR_PTR(-ENOENT);
3392 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3393 struct sk_buff *skb, const struct nlmsghdr *nlh,
3394 const struct nlattr * const nla[],
3395 struct netlink_ext_ack *extack)
3397 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3398 u8 genmask = nft_genmask_next(net);
3399 struct nft_table *table;
3400 struct nft_chain *chain = NULL;
3401 struct nft_rule *rule;
3402 int family = nfmsg->nfgen_family, err = 0;
3405 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3406 if (IS_ERR(table)) {
3407 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3408 return PTR_ERR(table);
3411 if (nla[NFTA_RULE_CHAIN]) {
3412 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3414 if (IS_ERR(chain)) {
3415 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3416 return PTR_ERR(chain);
3418 if (nft_chain_is_bound(chain))
3422 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3425 if (nla[NFTA_RULE_HANDLE]) {
3426 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3428 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3429 return PTR_ERR(rule);
3432 err = nft_delrule(&ctx, rule);
3433 } else if (nla[NFTA_RULE_ID]) {
3434 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3436 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3437 return PTR_ERR(rule);
3440 err = nft_delrule(&ctx, rule);
3442 err = nft_delrule_by_chain(&ctx);
3445 list_for_each_entry(chain, &table->chains, list) {
3446 if (!nft_is_active_next(net, chain))
3450 err = nft_delrule_by_chain(&ctx);
3462 static const struct nft_set_type *nft_set_types[] = {
3463 &nft_set_hash_fast_type,
3465 &nft_set_rhash_type,
3466 &nft_set_bitmap_type,
3467 &nft_set_rbtree_type,
3468 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3469 &nft_set_pipapo_avx2_type,
3471 &nft_set_pipapo_type,
3474 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3475 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3478 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3480 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3484 * Select a set implementation based on the data characteristics and the
3485 * given policy. The total memory use might not be known if no size is
3486 * given, in that case the amount of memory per element is used.
3488 static const struct nft_set_ops *
3489 nft_select_set_ops(const struct nft_ctx *ctx,
3490 const struct nlattr * const nla[],
3491 const struct nft_set_desc *desc,
3492 enum nft_set_policies policy)
3494 const struct nft_set_ops *ops, *bops;
3495 struct nft_set_estimate est, best;
3496 const struct nft_set_type *type;
3500 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3501 lockdep_nfnl_nft_mutex_not_held();
3503 if (nla[NFTA_SET_FLAGS] != NULL)
3504 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3511 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3512 type = nft_set_types[i];
3515 if (!nft_set_ops_candidate(type, flags))
3517 if (!ops->estimate(desc, flags, &est))
3521 case NFT_SET_POL_PERFORMANCE:
3522 if (est.lookup < best.lookup)
3524 if (est.lookup == best.lookup &&
3525 est.space < best.space)
3528 case NFT_SET_POL_MEMORY:
3530 if (est.space < best.space)
3532 if (est.space == best.space &&
3533 est.lookup < best.lookup)
3535 } else if (est.size < best.size || !bops) {
3550 return ERR_PTR(-EOPNOTSUPP);
3553 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3554 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3555 .len = NFT_TABLE_MAXNAMELEN - 1 },
3556 [NFTA_SET_NAME] = { .type = NLA_STRING,
3557 .len = NFT_SET_MAXNAMELEN - 1 },
3558 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3559 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3560 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3561 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3562 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3563 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3564 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3565 [NFTA_SET_ID] = { .type = NLA_U32 },
3566 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3567 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3568 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3569 .len = NFT_USERDATA_MAXLEN },
3570 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3571 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3572 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3575 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3576 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3577 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3580 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3581 const struct sk_buff *skb,
3582 const struct nlmsghdr *nlh,
3583 const struct nlattr * const nla[],
3584 struct netlink_ext_ack *extack,
3587 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3588 int family = nfmsg->nfgen_family;
3589 struct nft_table *table = NULL;
3591 if (nla[NFTA_SET_TABLE] != NULL) {
3592 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3594 if (IS_ERR(table)) {
3595 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3596 return PTR_ERR(table);
3600 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3604 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3605 const struct nlattr *nla, u8 genmask)
3607 struct nft_set *set;
3610 return ERR_PTR(-EINVAL);
3612 list_for_each_entry_rcu(set, &table->sets, list) {
3613 if (!nla_strcmp(nla, set->name) &&
3614 nft_active_genmask(set, genmask))
3617 return ERR_PTR(-ENOENT);
3620 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3621 const struct nlattr *nla,
3624 struct nft_set *set;
3626 list_for_each_entry(set, &table->sets, list) {
3627 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3628 nft_active_genmask(set, genmask))
3631 return ERR_PTR(-ENOENT);
3634 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3635 const struct nlattr *nla, u8 genmask)
3637 struct nft_trans *trans;
3638 u32 id = ntohl(nla_get_be32(nla));
3640 list_for_each_entry(trans, &net->nft.commit_list, list) {
3641 if (trans->msg_type == NFT_MSG_NEWSET) {
3642 struct nft_set *set = nft_trans_set(trans);
3644 if (id == nft_trans_set_id(trans) &&
3645 nft_active_genmask(set, genmask))
3649 return ERR_PTR(-ENOENT);
3652 struct nft_set *nft_set_lookup_global(const struct net *net,
3653 const struct nft_table *table,
3654 const struct nlattr *nla_set_name,
3655 const struct nlattr *nla_set_id,
3658 struct nft_set *set;
3660 set = nft_set_lookup(table, nla_set_name, genmask);
3665 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3669 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3671 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3674 const struct nft_set *i;
3676 unsigned long *inuse;
3677 unsigned int n = 0, min = 0;
3679 p = strchr(name, '%');
3681 if (p[1] != 'd' || strchr(p + 2, '%'))
3684 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3688 list_for_each_entry(i, &ctx->table->sets, list) {
3691 if (!nft_is_active_next(ctx->net, set))
3693 if (!sscanf(i->name, name, &tmp))
3695 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3698 set_bit(tmp - min, inuse);
3701 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3702 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3703 min += BITS_PER_BYTE * PAGE_SIZE;
3704 memset(inuse, 0, PAGE_SIZE);
3707 free_page((unsigned long)inuse);
3710 set->name = kasprintf(GFP_KERNEL, name, min + n);
3714 list_for_each_entry(i, &ctx->table->sets, list) {
3715 if (!nft_is_active_next(ctx->net, i))
3717 if (!strcmp(set->name, i->name)) {
3726 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3728 u64 ms = be64_to_cpu(nla_get_be64(nla));
3729 u64 max = (u64)(~((u64)0));
3731 max = div_u64(max, NSEC_PER_MSEC);
3735 ms *= NSEC_PER_MSEC;
3736 *result = nsecs_to_jiffies64(ms);
3740 __be64 nf_jiffies64_to_msecs(u64 input)
3742 return cpu_to_be64(jiffies64_to_msecs(input));
3745 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3746 const struct nft_set *set)
3748 struct nlattr *concat, *field;
3751 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3755 for (i = 0; i < set->field_count; i++) {
3756 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3760 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3761 htonl(set->field_len[i])))
3764 nla_nest_end(skb, field);
3767 nla_nest_end(skb, concat);
3772 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3773 const struct nft_set *set, u16 event, u16 flags)
3775 struct nfgenmsg *nfmsg;
3776 struct nlmsghdr *nlh;
3777 u32 portid = ctx->portid;
3778 struct nlattr *nest;
3781 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3782 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3785 goto nla_put_failure;
3787 nfmsg = nlmsg_data(nlh);
3788 nfmsg->nfgen_family = ctx->family;
3789 nfmsg->version = NFNETLINK_V0;
3790 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3792 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3793 goto nla_put_failure;
3794 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3795 goto nla_put_failure;
3796 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3798 goto nla_put_failure;
3799 if (set->flags != 0)
3800 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3801 goto nla_put_failure;
3803 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3804 goto nla_put_failure;
3805 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3806 goto nla_put_failure;
3807 if (set->flags & NFT_SET_MAP) {
3808 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3809 goto nla_put_failure;
3810 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3811 goto nla_put_failure;
3813 if (set->flags & NFT_SET_OBJECT &&
3814 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3815 goto nla_put_failure;
3818 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3819 nf_jiffies64_to_msecs(set->timeout),
3821 goto nla_put_failure;
3823 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3824 goto nla_put_failure;
3826 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3827 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3828 goto nla_put_failure;
3832 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3833 goto nla_put_failure;
3835 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3837 goto nla_put_failure;
3839 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3840 goto nla_put_failure;
3842 if (set->field_count > 1 &&
3843 nf_tables_fill_set_concat(skb, set))
3844 goto nla_put_failure;
3846 nla_nest_end(skb, nest);
3849 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3850 if (nf_tables_fill_expr_info(skb, set->expr) < 0)
3851 goto nla_put_failure;
3853 nla_nest_end(skb, nest);
3856 nlmsg_end(skb, nlh);
3860 nlmsg_trim(skb, nlh);
3864 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3865 const struct nft_set *set, int event,
3868 struct sk_buff *skb;
3869 u32 portid = ctx->portid;
3871 char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3872 ctx->table->name, ctx->table->handle,
3873 set->name, set->handle);
3875 audit_log_nfcfg(buf,
3878 event == NFT_MSG_NEWSET ?
3879 AUDIT_NFT_OP_SET_REGISTER :
3880 AUDIT_NFT_OP_SET_UNREGISTER,
3885 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3888 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3892 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3898 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3901 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3904 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3906 const struct nft_set *set;
3907 unsigned int idx, s_idx = cb->args[0];
3908 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3909 struct net *net = sock_net(skb->sk);
3910 struct nft_ctx *ctx = cb->data, ctx_set;
3916 cb->seq = net->nft.base_seq;
3918 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3919 if (ctx->family != NFPROTO_UNSPEC &&
3920 ctx->family != table->family)
3923 if (ctx->table && ctx->table != table)
3927 if (cur_table != table)
3933 list_for_each_entry_rcu(set, &table->sets, list) {
3936 if (!nft_is_active(net, set))
3940 ctx_set.table = table;
3941 ctx_set.family = table->family;
3943 if (nf_tables_fill_set(skb, &ctx_set, set,
3947 cb->args[2] = (unsigned long) table;
3950 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3963 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3965 struct nft_ctx *ctx_dump = NULL;
3967 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3968 if (ctx_dump == NULL)
3971 cb->data = ctx_dump;
3975 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3981 /* called with rcu_read_lock held */
3982 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3983 struct sk_buff *skb, const struct nlmsghdr *nlh,
3984 const struct nlattr * const nla[],
3985 struct netlink_ext_ack *extack)
3987 u8 genmask = nft_genmask_cur(net);
3988 const struct nft_set *set;
3990 struct sk_buff *skb2;
3991 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3994 /* Verify existence before starting dump */
3995 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4000 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4001 struct netlink_dump_control c = {
4002 .start = nf_tables_dump_sets_start,
4003 .dump = nf_tables_dump_sets,
4004 .done = nf_tables_dump_sets_done,
4006 .module = THIS_MODULE,
4009 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4012 /* Only accept unspec with dump */
4013 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4014 return -EAFNOSUPPORT;
4015 if (!nla[NFTA_SET_TABLE])
4018 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4020 return PTR_ERR(set);
4022 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4026 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4028 goto err_fill_set_info;
4030 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4037 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4038 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4041 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4042 struct nft_set_desc *desc)
4044 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4048 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4049 nft_concat_policy, NULL);
4053 if (!tb[NFTA_SET_FIELD_LEN])
4056 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4058 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4061 desc->field_len[desc->field_count++] = len;
4066 static int nft_set_desc_concat(struct nft_set_desc *desc,
4067 const struct nlattr *nla)
4069 struct nlattr *attr;
4072 nla_for_each_nested(attr, nla, rem) {
4073 if (nla_type(attr) != NFTA_LIST_ELEM)
4076 err = nft_set_desc_concat_parse(attr, desc);
4084 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4085 const struct nlattr *nla)
4087 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4090 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4091 nft_set_desc_policy, NULL);
4095 if (da[NFTA_SET_DESC_SIZE] != NULL)
4096 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4097 if (da[NFTA_SET_DESC_CONCAT])
4098 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4103 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4104 struct sk_buff *skb, const struct nlmsghdr *nlh,
4105 const struct nlattr * const nla[],
4106 struct netlink_ext_ack *extack)
4108 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4109 u8 genmask = nft_genmask_next(net);
4110 int family = nfmsg->nfgen_family;
4111 const struct nft_set_ops *ops;
4112 struct nft_expr *expr = NULL;
4113 struct nft_table *table;
4114 struct nft_set *set;
4119 u32 ktype, dtype, flags, policy, gc_int, objtype;
4120 struct nft_set_desc desc;
4121 unsigned char *udata;
4126 if (nla[NFTA_SET_TABLE] == NULL ||
4127 nla[NFTA_SET_NAME] == NULL ||
4128 nla[NFTA_SET_KEY_LEN] == NULL ||
4129 nla[NFTA_SET_ID] == NULL)
4132 memset(&desc, 0, sizeof(desc));
4134 ktype = NFT_DATA_VALUE;
4135 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4136 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4137 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4141 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4142 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4146 if (nla[NFTA_SET_FLAGS] != NULL) {
4147 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4148 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4149 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4150 NFT_SET_MAP | NFT_SET_EVAL |
4151 NFT_SET_OBJECT | NFT_SET_CONCAT))
4153 /* Only one of these operations is supported */
4154 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4155 (NFT_SET_MAP | NFT_SET_OBJECT))
4157 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4158 (NFT_SET_EVAL | NFT_SET_OBJECT))
4163 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4164 if (!(flags & NFT_SET_MAP))
4167 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4168 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4169 dtype != NFT_DATA_VERDICT)
4172 if (dtype != NFT_DATA_VERDICT) {
4173 if (nla[NFTA_SET_DATA_LEN] == NULL)
4175 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4176 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4179 desc.dlen = sizeof(struct nft_verdict);
4180 } else if (flags & NFT_SET_MAP)
4183 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4184 if (!(flags & NFT_SET_OBJECT))
4187 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4188 if (objtype == NFT_OBJECT_UNSPEC ||
4189 objtype > NFT_OBJECT_MAX)
4191 } else if (flags & NFT_SET_OBJECT)
4194 objtype = NFT_OBJECT_UNSPEC;
4197 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4198 if (!(flags & NFT_SET_TIMEOUT))
4201 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4206 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4207 if (!(flags & NFT_SET_TIMEOUT))
4209 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4212 policy = NFT_SET_POL_PERFORMANCE;
4213 if (nla[NFTA_SET_POLICY] != NULL)
4214 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4216 if (nla[NFTA_SET_DESC] != NULL) {
4217 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4222 if (nla[NFTA_SET_EXPR])
4225 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4226 if (IS_ERR(table)) {
4227 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4228 return PTR_ERR(table);
4231 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4233 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4235 if (PTR_ERR(set) != -ENOENT) {
4236 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4237 return PTR_ERR(set);
4240 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4241 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4244 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4250 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4253 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4255 return PTR_ERR(ops);
4258 if (nla[NFTA_SET_USERDATA])
4259 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4262 if (ops->privsize != NULL)
4263 size = ops->privsize(nla, &desc);
4265 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4269 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4275 err = nf_tables_set_alloc_name(&ctx, set, name);
4278 goto err_set_alloc_name;
4280 if (nla[NFTA_SET_EXPR]) {
4281 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4283 err = PTR_ERR(expr);
4284 goto err_set_alloc_name;
4290 udata = set->data + size;
4291 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4294 INIT_LIST_HEAD(&set->bindings);
4296 write_pnet(&set->net, net);
4299 set->klen = desc.klen;
4301 set->objtype = objtype;
4302 set->dlen = desc.dlen;
4305 set->size = desc.size;
4306 set->policy = policy;
4309 set->timeout = timeout;
4310 set->gc_int = gc_int;
4311 set->handle = nf_tables_alloc_handle(table);
4313 set->field_count = desc.field_count;
4314 for (i = 0; i < desc.field_count; i++)
4315 set->field_len[i] = desc.field_len[i];
4317 err = ops->init(set, &desc, nla);
4321 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4325 list_add_tail_rcu(&set->list, &table->sets);
4333 nft_expr_destroy(&ctx, expr);
4341 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4343 if (WARN_ON(set->use > 0))
4347 nft_expr_destroy(ctx, set->expr);
4349 set->ops->destroy(set);
4354 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4355 struct sk_buff *skb, const struct nlmsghdr *nlh,
4356 const struct nlattr * const nla[],
4357 struct netlink_ext_ack *extack)
4359 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4360 u8 genmask = nft_genmask_next(net);
4361 const struct nlattr *attr;
4362 struct nft_set *set;
4366 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4367 return -EAFNOSUPPORT;
4368 if (nla[NFTA_SET_TABLE] == NULL)
4371 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4376 if (nla[NFTA_SET_HANDLE]) {
4377 attr = nla[NFTA_SET_HANDLE];
4378 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4380 attr = nla[NFTA_SET_NAME];
4381 set = nft_set_lookup(ctx.table, attr, genmask);
4385 NL_SET_BAD_ATTR(extack, attr);
4386 return PTR_ERR(set);
4389 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4390 NL_SET_BAD_ATTR(extack, attr);
4394 return nft_delset(&ctx, set);
4397 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4398 struct nft_set *set,
4399 const struct nft_set_iter *iter,
4400 struct nft_set_elem *elem)
4402 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4403 enum nft_registers dreg;
4405 dreg = nft_type_to_reg(set->dtype);
4406 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4407 set->dtype == NFT_DATA_VERDICT ?
4408 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4412 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4413 struct nft_set_binding *binding)
4415 struct nft_set_binding *i;
4416 struct nft_set_iter iter;
4418 if (set->use == UINT_MAX)
4421 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4424 if (binding->flags & NFT_SET_MAP) {
4425 /* If the set is already bound to the same chain all
4426 * jumps are already validated for that chain.
4428 list_for_each_entry(i, &set->bindings, list) {
4429 if (i->flags & NFT_SET_MAP &&
4430 i->chain == binding->chain)
4434 iter.genmask = nft_genmask_next(ctx->net);
4438 iter.fn = nf_tables_bind_check_setelem;
4440 set->ops->walk(ctx, set, &iter);
4445 binding->chain = ctx->chain;
4446 list_add_tail_rcu(&binding->list, &set->bindings);
4447 nft_set_trans_bind(ctx, set);
4452 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4454 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4455 struct nft_set_binding *binding, bool event)
4457 list_del_rcu(&binding->list);
4459 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4460 list_del_rcu(&set->list);
4462 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4467 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4468 struct nft_set_binding *binding,
4469 enum nft_trans_phase phase)
4472 case NFT_TRANS_PREPARE:
4475 case NFT_TRANS_ABORT:
4476 case NFT_TRANS_RELEASE:
4480 nf_tables_unbind_set(ctx, set, binding,
4481 phase == NFT_TRANS_COMMIT);
4484 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4486 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4488 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4489 nft_set_destroy(ctx, set);
4491 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4493 const struct nft_set_ext_type nft_set_ext_types[] = {
4494 [NFT_SET_EXT_KEY] = {
4495 .align = __alignof__(u32),
4497 [NFT_SET_EXT_DATA] = {
4498 .align = __alignof__(u32),
4500 [NFT_SET_EXT_EXPR] = {
4501 .align = __alignof__(struct nft_expr),
4503 [NFT_SET_EXT_OBJREF] = {
4504 .len = sizeof(struct nft_object *),
4505 .align = __alignof__(struct nft_object *),
4507 [NFT_SET_EXT_FLAGS] = {
4509 .align = __alignof__(u8),
4511 [NFT_SET_EXT_TIMEOUT] = {
4513 .align = __alignof__(u64),
4515 [NFT_SET_EXT_EXPIRATION] = {
4517 .align = __alignof__(u64),
4519 [NFT_SET_EXT_USERDATA] = {
4520 .len = sizeof(struct nft_userdata),
4521 .align = __alignof__(struct nft_userdata),
4523 [NFT_SET_EXT_KEY_END] = {
4524 .align = __alignof__(u32),
4532 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4533 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4534 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4535 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4536 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4537 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4538 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4539 .len = NFT_USERDATA_MAXLEN },
4540 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4541 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4542 .len = NFT_OBJ_MAXNAMELEN - 1 },
4543 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4546 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4547 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4548 .len = NFT_TABLE_MAXNAMELEN - 1 },
4549 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4550 .len = NFT_SET_MAXNAMELEN - 1 },
4551 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4552 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4555 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4556 const struct sk_buff *skb,
4557 const struct nlmsghdr *nlh,
4558 const struct nlattr * const nla[],
4559 struct netlink_ext_ack *extack,
4562 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4563 int family = nfmsg->nfgen_family;
4564 struct nft_table *table;
4566 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4568 if (IS_ERR(table)) {
4569 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4570 return PTR_ERR(table);
4573 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4577 static int nf_tables_fill_setelem(struct sk_buff *skb,
4578 const struct nft_set *set,
4579 const struct nft_set_elem *elem)
4581 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4582 unsigned char *b = skb_tail_pointer(skb);
4583 struct nlattr *nest;
4585 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4587 goto nla_put_failure;
4589 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4590 NFT_DATA_VALUE, set->klen) < 0)
4591 goto nla_put_failure;
4593 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4594 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4595 NFT_DATA_VALUE, set->klen) < 0)
4596 goto nla_put_failure;
4598 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4599 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4600 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4602 goto nla_put_failure;
4604 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR) &&
4605 nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, nft_set_ext_expr(ext)) < 0)
4606 goto nla_put_failure;
4608 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4609 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4610 (*nft_set_ext_obj(ext))->key.name) < 0)
4611 goto nla_put_failure;
4613 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4614 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4615 htonl(*nft_set_ext_flags(ext))))
4616 goto nla_put_failure;
4618 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4619 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4620 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4622 goto nla_put_failure;
4624 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4625 u64 expires, now = get_jiffies_64();
4627 expires = *nft_set_ext_expiration(ext);
4628 if (time_before64(now, expires))
4633 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4634 nf_jiffies64_to_msecs(expires),
4636 goto nla_put_failure;
4639 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4640 struct nft_userdata *udata;
4642 udata = nft_set_ext_userdata(ext);
4643 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4644 udata->len + 1, udata->data))
4645 goto nla_put_failure;
4648 nla_nest_end(skb, nest);
4656 struct nft_set_dump_args {
4657 const struct netlink_callback *cb;
4658 struct nft_set_iter iter;
4659 struct sk_buff *skb;
4662 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4663 struct nft_set *set,
4664 const struct nft_set_iter *iter,
4665 struct nft_set_elem *elem)
4667 struct nft_set_dump_args *args;
4669 args = container_of(iter, struct nft_set_dump_args, iter);
4670 return nf_tables_fill_setelem(args->skb, set, elem);
4673 struct nft_set_dump_ctx {
4674 const struct nft_set *set;
4678 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4680 struct nft_set_dump_ctx *dump_ctx = cb->data;
4681 struct net *net = sock_net(skb->sk);
4682 struct nft_table *table;
4683 struct nft_set *set;
4684 struct nft_set_dump_args args;
4685 bool set_found = false;
4686 struct nfgenmsg *nfmsg;
4687 struct nlmsghdr *nlh;
4688 struct nlattr *nest;
4693 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4694 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4695 dump_ctx->ctx.family != table->family)
4698 if (table != dump_ctx->ctx.table)
4701 list_for_each_entry_rcu(set, &table->sets, list) {
4702 if (set == dump_ctx->set) {
4715 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4716 portid = NETLINK_CB(cb->skb).portid;
4717 seq = cb->nlh->nlmsg_seq;
4719 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4722 goto nla_put_failure;
4724 nfmsg = nlmsg_data(nlh);
4725 nfmsg->nfgen_family = table->family;
4726 nfmsg->version = NFNETLINK_V0;
4727 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4729 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4730 goto nla_put_failure;
4731 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4732 goto nla_put_failure;
4734 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4736 goto nla_put_failure;
4740 args.iter.genmask = nft_genmask_cur(net);
4741 args.iter.skip = cb->args[0];
4742 args.iter.count = 0;
4744 args.iter.fn = nf_tables_dump_setelem;
4745 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4748 nla_nest_end(skb, nest);
4749 nlmsg_end(skb, nlh);
4751 if (args.iter.err && args.iter.err != -EMSGSIZE)
4752 return args.iter.err;
4753 if (args.iter.count == cb->args[0])
4756 cb->args[0] = args.iter.count;
4764 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4766 struct nft_set_dump_ctx *dump_ctx = cb->data;
4768 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4770 return cb->data ? 0 : -ENOMEM;
4773 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4779 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4780 const struct nft_ctx *ctx, u32 seq,
4781 u32 portid, int event, u16 flags,
4782 const struct nft_set *set,
4783 const struct nft_set_elem *elem)
4785 struct nfgenmsg *nfmsg;
4786 struct nlmsghdr *nlh;
4787 struct nlattr *nest;
4790 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4791 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4794 goto nla_put_failure;
4796 nfmsg = nlmsg_data(nlh);
4797 nfmsg->nfgen_family = ctx->family;
4798 nfmsg->version = NFNETLINK_V0;
4799 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4801 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4802 goto nla_put_failure;
4803 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4804 goto nla_put_failure;
4806 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4808 goto nla_put_failure;
4810 err = nf_tables_fill_setelem(skb, set, elem);
4812 goto nla_put_failure;
4814 nla_nest_end(skb, nest);
4816 nlmsg_end(skb, nlh);
4820 nlmsg_trim(skb, nlh);
4824 static int nft_setelem_parse_flags(const struct nft_set *set,
4825 const struct nlattr *attr, u32 *flags)
4830 *flags = ntohl(nla_get_be32(attr));
4831 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4833 if (!(set->flags & NFT_SET_INTERVAL) &&
4834 *flags & NFT_SET_ELEM_INTERVAL_END)
4840 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4841 struct nft_data *key, struct nlattr *attr)
4843 struct nft_data_desc desc;
4846 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4850 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4851 nft_data_release(key, desc.type);
4858 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4859 struct nft_data_desc *desc,
4860 struct nft_data *data,
4861 struct nlattr *attr)
4865 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4869 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4870 nft_data_release(data, desc->type);
4877 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4878 const struct nlattr *attr)
4880 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4881 struct nft_set_elem elem;
4882 struct sk_buff *skb;
4887 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4888 nft_set_elem_policy, NULL);
4892 if (!nla[NFTA_SET_ELEM_KEY])
4895 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4899 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4900 nla[NFTA_SET_ELEM_KEY]);
4904 if (nla[NFTA_SET_ELEM_KEY_END]) {
4905 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4906 nla[NFTA_SET_ELEM_KEY_END]);
4911 priv = set->ops->get(ctx->net, set, &elem, flags);
4913 return PTR_ERR(priv);
4918 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
4922 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
4923 NFT_MSG_NEWSETELEM, 0, set, &elem);
4925 goto err_fill_setelem;
4927 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
4934 /* called with rcu_read_lock held */
4935 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
4936 struct sk_buff *skb, const struct nlmsghdr *nlh,
4937 const struct nlattr * const nla[],
4938 struct netlink_ext_ack *extack)
4940 u8 genmask = nft_genmask_cur(net);
4941 struct nft_set *set;
4942 struct nlattr *attr;
4946 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
4951 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
4953 return PTR_ERR(set);
4955 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4956 struct netlink_dump_control c = {
4957 .start = nf_tables_dump_set_start,
4958 .dump = nf_tables_dump_set,
4959 .done = nf_tables_dump_set_done,
4960 .module = THIS_MODULE,
4962 struct nft_set_dump_ctx dump_ctx = {
4968 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4971 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
4974 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
4975 err = nft_get_set_elem(&ctx, set, attr);
4983 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
4984 const struct nft_set *set,
4985 const struct nft_set_elem *elem,
4986 int event, u16 flags)
4988 struct net *net = ctx->net;
4989 u32 portid = ctx->portid;
4990 struct sk_buff *skb;
4992 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
4993 ctx->table->name, ctx->table->handle,
4994 set->name, set->handle);
4996 audit_log_nfcfg(buf,
4999 event == NFT_MSG_NEWSETELEM ?
5000 AUDIT_NFT_OP_SETELEM_REGISTER :
5001 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5005 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5008 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5012 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5019 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5022 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5025 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5027 struct nft_set *set)
5029 struct nft_trans *trans;
5031 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5035 nft_trans_elem_set(trans) = set;
5039 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5040 const struct nft_set *set,
5041 const struct nlattr *attr)
5043 struct nft_expr *expr;
5046 expr = nft_expr_init(ctx, attr);
5051 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5052 goto err_set_elem_expr;
5054 if (expr->ops->type->flags & NFT_EXPR_GC) {
5055 if (set->flags & NFT_SET_TIMEOUT)
5056 goto err_set_elem_expr;
5057 if (!set->ops->gc_init)
5058 goto err_set_elem_expr;
5059 set->ops->gc_init(set);
5065 nft_expr_destroy(ctx, expr);
5066 return ERR_PTR(err);
5069 void *nft_set_elem_init(const struct nft_set *set,
5070 const struct nft_set_ext_tmpl *tmpl,
5071 const u32 *key, const u32 *key_end,
5072 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5074 struct nft_set_ext *ext;
5077 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5081 ext = nft_set_elem_ext(set, elem);
5082 nft_set_ext_init(ext, tmpl);
5084 memcpy(nft_set_ext_key(ext), key, set->klen);
5085 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5086 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5087 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5088 memcpy(nft_set_ext_data(ext), data, set->dlen);
5089 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5090 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5091 if (expiration == 0)
5092 *nft_set_ext_expiration(ext) += timeout;
5094 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5095 *nft_set_ext_timeout(ext) = timeout;
5100 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5101 struct nft_expr *expr)
5103 if (expr->ops->destroy_clone) {
5104 expr->ops->destroy_clone(ctx, expr);
5105 module_put(expr->ops->type->owner);
5107 nf_tables_expr_destroy(ctx, expr);
5111 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5114 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5115 struct nft_ctx ctx = {
5116 .net = read_pnet(&set->net),
5117 .family = set->table->family,
5120 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5121 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5122 nft_data_release(nft_set_ext_data(ext), set->dtype);
5123 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5124 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5126 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5127 (*nft_set_ext_obj(ext))->use--;
5130 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5132 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5133 * the refcounting from the preparation phase.
5135 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5136 const struct nft_set *set, void *elem)
5138 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5140 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPR))
5141 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5146 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5147 const struct nlattr *attr, u32 nlmsg_flags)
5149 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5150 u8 genmask = nft_genmask_next(ctx->net);
5151 struct nft_set_ext_tmpl tmpl;
5152 struct nft_set_ext *ext, *ext2;
5153 struct nft_set_elem elem;
5154 struct nft_set_binding *binding;
5155 struct nft_object *obj = NULL;
5156 struct nft_expr *expr = NULL;
5157 struct nft_userdata *udata;
5158 struct nft_data_desc desc;
5159 enum nft_registers dreg;
5160 struct nft_trans *trans;
5167 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5168 nft_set_elem_policy, NULL);
5172 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5175 nft_set_ext_prepare(&tmpl);
5177 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5181 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5183 if (set->flags & NFT_SET_MAP) {
5184 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5185 !(flags & NFT_SET_ELEM_INTERVAL_END))
5188 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5192 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5193 (nla[NFTA_SET_ELEM_DATA] ||
5194 nla[NFTA_SET_ELEM_OBJREF] ||
5195 nla[NFTA_SET_ELEM_TIMEOUT] ||
5196 nla[NFTA_SET_ELEM_EXPIRATION] ||
5197 nla[NFTA_SET_ELEM_USERDATA] ||
5198 nla[NFTA_SET_ELEM_EXPR]))
5202 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5203 if (!(set->flags & NFT_SET_TIMEOUT))
5205 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5209 } else if (set->flags & NFT_SET_TIMEOUT) {
5210 timeout = set->timeout;
5214 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5215 if (!(set->flags & NFT_SET_TIMEOUT))
5217 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5223 if (nla[NFTA_SET_ELEM_EXPR] != NULL) {
5224 expr = nft_set_elem_expr_alloc(ctx, set,
5225 nla[NFTA_SET_ELEM_EXPR]);
5227 return PTR_ERR(expr);
5230 if (set->expr && set->expr->ops != expr->ops)
5231 goto err_set_elem_expr;
5232 } else if (set->expr) {
5233 expr = kzalloc(set->expr->ops->size, GFP_KERNEL);
5237 err = nft_expr_clone(expr, set->expr);
5239 goto err_set_elem_expr;
5242 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5243 nla[NFTA_SET_ELEM_KEY]);
5245 goto err_set_elem_expr;
5247 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5249 if (nla[NFTA_SET_ELEM_KEY_END]) {
5250 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5251 nla[NFTA_SET_ELEM_KEY_END]);
5255 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5259 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5260 if (timeout != set->timeout)
5261 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5265 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPR,
5268 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5269 if (!(set->flags & NFT_SET_OBJECT)) {
5271 goto err_parse_key_end;
5273 obj = nft_obj_lookup(ctx->net, ctx->table,
5274 nla[NFTA_SET_ELEM_OBJREF],
5275 set->objtype, genmask);
5278 goto err_parse_key_end;
5280 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5283 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5284 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5285 nla[NFTA_SET_ELEM_DATA]);
5287 goto err_parse_key_end;
5289 dreg = nft_type_to_reg(set->dtype);
5290 list_for_each_entry(binding, &set->bindings, list) {
5291 struct nft_ctx bind_ctx = {
5293 .family = ctx->family,
5294 .table = ctx->table,
5295 .chain = (struct nft_chain *)binding->chain,
5298 if (!(binding->flags & NFT_SET_MAP))
5301 err = nft_validate_register_store(&bind_ctx, dreg,
5303 desc.type, desc.len);
5305 goto err_parse_data;
5307 if (desc.type == NFT_DATA_VERDICT &&
5308 (elem.data.val.verdict.code == NFT_GOTO ||
5309 elem.data.val.verdict.code == NFT_JUMP))
5310 nft_validate_state_update(ctx->net,
5314 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5317 /* The full maximum length of userdata can exceed the maximum
5318 * offset value (U8_MAX) for following extensions, therefor it
5319 * must be the last extension added.
5322 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5323 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5325 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5330 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5331 elem.key_end.val.data, elem.data.val.data,
5332 timeout, expiration, GFP_KERNEL);
5333 if (elem.priv == NULL)
5334 goto err_parse_data;
5336 ext = nft_set_elem_ext(set, elem.priv);
5338 *nft_set_ext_flags(ext) = flags;
5340 udata = nft_set_ext_userdata(ext);
5341 udata->len = ulen - 1;
5342 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5345 *nft_set_ext_obj(ext) = obj;
5349 memcpy(nft_set_ext_expr(ext), expr, expr->ops->size);
5354 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5358 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5359 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5361 if (err == -EEXIST) {
5362 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5363 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5364 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5365 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5366 goto err_element_clash;
5367 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5368 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5369 memcmp(nft_set_ext_data(ext),
5370 nft_set_ext_data(ext2), set->dlen) != 0) ||
5371 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5372 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5373 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5374 goto err_element_clash;
5375 else if (!(nlmsg_flags & NLM_F_EXCL))
5377 } else if (err == -ENOTEMPTY) {
5378 /* ENOTEMPTY reports overlapping between this element
5379 * and an existing one.
5383 goto err_element_clash;
5387 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5392 nft_trans_elem(trans) = elem;
5393 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5397 set->ops->remove(ctx->net, set, &elem);
5404 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5406 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5407 nft_data_release(&elem.data.val, desc.type);
5409 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5411 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5414 nft_expr_destroy(ctx, expr);
5419 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5420 struct sk_buff *skb, const struct nlmsghdr *nlh,
5421 const struct nlattr * const nla[],
5422 struct netlink_ext_ack *extack)
5424 u8 genmask = nft_genmask_next(net);
5425 const struct nlattr *attr;
5426 struct nft_set *set;
5430 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5433 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5438 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5439 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5441 return PTR_ERR(set);
5443 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5446 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5447 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5452 if (net->nft.validate_state == NFT_VALIDATE_DO)
5453 return nft_table_validate(net, ctx.table);
5459 * nft_data_hold - hold a nft_data item
5461 * @data: struct nft_data to release
5462 * @type: type of data
5464 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5465 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5466 * NFT_GOTO verdicts. This function must be called on active data objects
5467 * from the second phase of the commit protocol.
5469 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5471 struct nft_chain *chain;
5472 struct nft_rule *rule;
5474 if (type == NFT_DATA_VERDICT) {
5475 switch (data->verdict.code) {
5478 chain = data->verdict.chain;
5481 if (!nft_chain_is_bound(chain))
5484 chain->table->use++;
5485 list_for_each_entry(rule, &chain->rules, list)
5488 nft_chain_add(chain->table, chain);
5494 static void nft_set_elem_activate(const struct net *net,
5495 const struct nft_set *set,
5496 struct nft_set_elem *elem)
5498 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5500 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5501 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5502 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5503 (*nft_set_ext_obj(ext))->use++;
5506 static void nft_set_elem_deactivate(const struct net *net,
5507 const struct nft_set *set,
5508 struct nft_set_elem *elem)
5510 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5512 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5513 nft_data_release(nft_set_ext_data(ext), set->dtype);
5514 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5515 (*nft_set_ext_obj(ext))->use--;
5518 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5519 const struct nlattr *attr)
5521 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5522 struct nft_set_ext_tmpl tmpl;
5523 struct nft_set_elem elem;
5524 struct nft_set_ext *ext;
5525 struct nft_trans *trans;
5530 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5531 nft_set_elem_policy, NULL);
5535 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5538 nft_set_ext_prepare(&tmpl);
5540 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5544 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5546 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5547 nla[NFTA_SET_ELEM_KEY]);
5551 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5553 if (nla[NFTA_SET_ELEM_KEY_END]) {
5554 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5555 nla[NFTA_SET_ELEM_KEY_END]);
5559 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5563 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5564 elem.key_end.val.data, NULL, 0, 0,
5566 if (elem.priv == NULL)
5569 ext = nft_set_elem_ext(set, elem.priv);
5571 *nft_set_ext_flags(ext) = flags;
5573 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5577 priv = set->ops->deactivate(ctx->net, set, &elem);
5585 nft_set_elem_deactivate(ctx->net, set, &elem);
5587 nft_trans_elem(trans) = elem;
5588 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5596 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5600 static int nft_flush_set(const struct nft_ctx *ctx,
5601 struct nft_set *set,
5602 const struct nft_set_iter *iter,
5603 struct nft_set_elem *elem)
5605 struct nft_trans *trans;
5608 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5609 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5613 if (!set->ops->flush(ctx->net, set, elem->priv)) {
5619 nft_set_elem_deactivate(ctx->net, set, elem);
5620 nft_trans_elem_set(trans) = set;
5621 nft_trans_elem(trans) = *elem;
5622 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5630 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5631 struct sk_buff *skb, const struct nlmsghdr *nlh,
5632 const struct nlattr * const nla[],
5633 struct netlink_ext_ack *extack)
5635 u8 genmask = nft_genmask_next(net);
5636 const struct nlattr *attr;
5637 struct nft_set *set;
5641 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5646 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5648 return PTR_ERR(set);
5649 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5652 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5653 struct nft_set_iter iter = {
5655 .fn = nft_flush_set,
5657 set->ops->walk(&ctx, set, &iter);
5662 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5663 err = nft_del_setelem(&ctx, set, attr);
5672 void nft_set_gc_batch_release(struct rcu_head *rcu)
5674 struct nft_set_gc_batch *gcb;
5677 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5678 for (i = 0; i < gcb->head.cnt; i++)
5679 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5683 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5686 struct nft_set_gc_batch *gcb;
5688 gcb = kzalloc(sizeof(*gcb), gfp);
5691 gcb->head.set = set;
5700 * nft_register_obj- register nf_tables stateful object type
5701 * @obj_type: object type
5703 * Registers the object type for use with nf_tables. Returns zero on
5704 * success or a negative errno code otherwise.
5706 int nft_register_obj(struct nft_object_type *obj_type)
5708 if (obj_type->type == NFT_OBJECT_UNSPEC)
5711 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5712 list_add_rcu(&obj_type->list, &nf_tables_objects);
5713 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5716 EXPORT_SYMBOL_GPL(nft_register_obj);
5719 * nft_unregister_obj - unregister nf_tables object type
5720 * @obj_type: object type
5722 * Unregisters the object type for use with nf_tables.
5724 void nft_unregister_obj(struct nft_object_type *obj_type)
5726 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5727 list_del_rcu(&obj_type->list);
5728 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5730 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5732 struct nft_object *nft_obj_lookup(const struct net *net,
5733 const struct nft_table *table,
5734 const struct nlattr *nla, u32 objtype,
5737 struct nft_object_hash_key k = { .table = table };
5738 char search[NFT_OBJ_MAXNAMELEN];
5739 struct rhlist_head *tmp, *list;
5740 struct nft_object *obj;
5742 nla_strlcpy(search, nla, sizeof(search));
5745 WARN_ON_ONCE(!rcu_read_lock_held() &&
5746 !lockdep_commit_lock_is_held(net));
5749 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5753 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5754 if (objtype == obj->ops->type->type &&
5755 nft_active_genmask(obj, genmask)) {
5762 return ERR_PTR(-ENOENT);
5764 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5766 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5767 const struct nlattr *nla,
5768 u32 objtype, u8 genmask)
5770 struct nft_object *obj;
5772 list_for_each_entry(obj, &table->objects, list) {
5773 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5774 objtype == obj->ops->type->type &&
5775 nft_active_genmask(obj, genmask))
5778 return ERR_PTR(-ENOENT);
5781 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5782 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5783 .len = NFT_TABLE_MAXNAMELEN - 1 },
5784 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5785 .len = NFT_OBJ_MAXNAMELEN - 1 },
5786 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5787 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5788 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5789 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
5790 .len = NFT_USERDATA_MAXLEN },
5793 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5794 const struct nft_object_type *type,
5795 const struct nlattr *attr)
5798 const struct nft_object_ops *ops;
5799 struct nft_object *obj;
5802 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5807 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5808 type->policy, NULL);
5812 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5815 if (type->select_ops) {
5816 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
5826 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
5830 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
5843 return ERR_PTR(err);
5846 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
5847 struct nft_object *obj, bool reset)
5849 struct nlattr *nest;
5851 nest = nla_nest_start_noflag(skb, attr);
5853 goto nla_put_failure;
5854 if (obj->ops->dump(skb, obj, reset) < 0)
5855 goto nla_put_failure;
5856 nla_nest_end(skb, nest);
5863 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
5865 const struct nft_object_type *type;
5867 list_for_each_entry(type, &nf_tables_objects, list) {
5868 if (objtype == type->type)
5874 static const struct nft_object_type *
5875 nft_obj_type_get(struct net *net, u32 objtype)
5877 const struct nft_object_type *type;
5879 type = __nft_obj_type_get(objtype);
5880 if (type != NULL && try_module_get(type->owner))
5883 lockdep_nfnl_nft_mutex_not_held();
5884 #ifdef CONFIG_MODULES
5886 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
5887 return ERR_PTR(-EAGAIN);
5890 return ERR_PTR(-ENOENT);
5893 static int nf_tables_updobj(const struct nft_ctx *ctx,
5894 const struct nft_object_type *type,
5895 const struct nlattr *attr,
5896 struct nft_object *obj)
5898 struct nft_object *newobj;
5899 struct nft_trans *trans;
5902 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
5903 sizeof(struct nft_trans_obj));
5907 newobj = nft_obj_init(ctx, type, attr);
5908 if (IS_ERR(newobj)) {
5909 err = PTR_ERR(newobj);
5910 goto err_free_trans;
5913 nft_trans_obj(trans) = obj;
5914 nft_trans_obj_update(trans) = true;
5915 nft_trans_obj_newobj(trans) = newobj;
5916 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5925 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
5926 struct sk_buff *skb, const struct nlmsghdr *nlh,
5927 const struct nlattr * const nla[],
5928 struct netlink_ext_ack *extack)
5930 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
5931 const struct nft_object_type *type;
5932 u8 genmask = nft_genmask_next(net);
5933 int family = nfmsg->nfgen_family;
5934 struct nft_table *table;
5935 struct nft_object *obj;
5940 if (!nla[NFTA_OBJ_TYPE] ||
5941 !nla[NFTA_OBJ_NAME] ||
5942 !nla[NFTA_OBJ_DATA])
5945 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
5946 if (IS_ERR(table)) {
5947 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
5948 return PTR_ERR(table);
5951 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
5952 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
5955 if (err != -ENOENT) {
5956 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5960 if (nlh->nlmsg_flags & NLM_F_EXCL) {
5961 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
5964 if (nlh->nlmsg_flags & NLM_F_REPLACE)
5967 type = __nft_obj_type_get(objtype);
5968 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5970 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
5973 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
5975 type = nft_obj_type_get(net, objtype);
5977 return PTR_ERR(type);
5979 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
5984 obj->key.table = table;
5985 obj->handle = nf_tables_alloc_handle(table);
5987 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
5988 if (!obj->key.name) {
5993 if (nla[NFTA_OBJ_USERDATA]) {
5994 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
5995 if (obj->udata == NULL)
5998 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6001 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6005 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6006 nft_objname_ht_params);
6010 list_add_tail_rcu(&obj->list, &table->objects);
6014 /* queued in transaction log */
6015 INIT_LIST_HEAD(&obj->list);
6018 kfree(obj->key.name);
6022 if (obj->ops->destroy)
6023 obj->ops->destroy(&ctx, obj);
6026 module_put(type->owner);
6030 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6031 u32 portid, u32 seq, int event, u32 flags,
6032 int family, const struct nft_table *table,
6033 struct nft_object *obj, bool reset)
6035 struct nfgenmsg *nfmsg;
6036 struct nlmsghdr *nlh;
6038 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6039 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6041 goto nla_put_failure;
6043 nfmsg = nlmsg_data(nlh);
6044 nfmsg->nfgen_family = family;
6045 nfmsg->version = NFNETLINK_V0;
6046 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6048 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6049 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6050 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6051 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6052 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6053 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6055 goto nla_put_failure;
6058 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6059 goto nla_put_failure;
6061 nlmsg_end(skb, nlh);
6065 nlmsg_trim(skb, nlh);
6069 struct nft_obj_filter {
6074 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6076 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6077 const struct nft_table *table;
6078 unsigned int idx = 0, s_idx = cb->args[0];
6079 struct nft_obj_filter *filter = cb->data;
6080 struct net *net = sock_net(skb->sk);
6081 int family = nfmsg->nfgen_family;
6082 struct nft_object *obj;
6085 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6089 cb->seq = net->nft.base_seq;
6091 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6092 if (family != NFPROTO_UNSPEC && family != table->family)
6095 list_for_each_entry_rcu(obj, &table->objects, list) {
6096 if (!nft_is_active(net, obj))
6101 memset(&cb->args[1], 0,
6102 sizeof(cb->args) - sizeof(cb->args[0]));
6103 if (filter && filter->table &&
6104 strcmp(filter->table, table->name))
6107 filter->type != NFT_OBJECT_UNSPEC &&
6108 obj->ops->type->type != filter->type)
6112 char *buf = kasprintf(GFP_ATOMIC,
6117 audit_log_nfcfg(buf,
6120 AUDIT_NFT_OP_OBJ_RESET,
6125 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6128 NLM_F_MULTI | NLM_F_APPEND,
6129 table->family, table,
6133 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6145 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6147 const struct nlattr * const *nla = cb->data;
6148 struct nft_obj_filter *filter = NULL;
6150 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6151 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6155 if (nla[NFTA_OBJ_TABLE]) {
6156 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6157 if (!filter->table) {
6163 if (nla[NFTA_OBJ_TYPE])
6164 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6171 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6173 struct nft_obj_filter *filter = cb->data;
6176 kfree(filter->table);
6183 /* called with rcu_read_lock held */
6184 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6185 struct sk_buff *skb, const struct nlmsghdr *nlh,
6186 const struct nlattr * const nla[],
6187 struct netlink_ext_ack *extack)
6189 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6190 u8 genmask = nft_genmask_cur(net);
6191 int family = nfmsg->nfgen_family;
6192 const struct nft_table *table;
6193 struct nft_object *obj;
6194 struct sk_buff *skb2;
6199 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6200 struct netlink_dump_control c = {
6201 .start = nf_tables_dump_obj_start,
6202 .dump = nf_tables_dump_obj,
6203 .done = nf_tables_dump_obj_done,
6204 .module = THIS_MODULE,
6205 .data = (void *)nla,
6208 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6211 if (!nla[NFTA_OBJ_NAME] ||
6212 !nla[NFTA_OBJ_TYPE])
6215 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6216 if (IS_ERR(table)) {
6217 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6218 return PTR_ERR(table);
6221 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6222 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6224 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6225 return PTR_ERR(obj);
6228 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6232 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6236 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6237 table->name, table->handle);
6239 audit_log_nfcfg(buf,
6242 AUDIT_NFT_OP_OBJ_RESET,
6247 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6248 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6249 family, table, obj, reset);
6251 goto err_fill_obj_info;
6253 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6260 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6262 if (obj->ops->destroy)
6263 obj->ops->destroy(ctx, obj);
6265 module_put(obj->ops->type->owner);
6266 kfree(obj->key.name);
6271 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6272 struct sk_buff *skb, const struct nlmsghdr *nlh,
6273 const struct nlattr * const nla[],
6274 struct netlink_ext_ack *extack)
6276 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6277 u8 genmask = nft_genmask_next(net);
6278 int family = nfmsg->nfgen_family;
6279 const struct nlattr *attr;
6280 struct nft_table *table;
6281 struct nft_object *obj;
6285 if (!nla[NFTA_OBJ_TYPE] ||
6286 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6289 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6290 if (IS_ERR(table)) {
6291 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6292 return PTR_ERR(table);
6295 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6296 if (nla[NFTA_OBJ_HANDLE]) {
6297 attr = nla[NFTA_OBJ_HANDLE];
6298 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6300 attr = nla[NFTA_OBJ_NAME];
6301 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6305 NL_SET_BAD_ATTR(extack, attr);
6306 return PTR_ERR(obj);
6309 NL_SET_BAD_ATTR(extack, attr);
6313 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6315 return nft_delobj(&ctx, obj);
6318 void nft_obj_notify(struct net *net, const struct nft_table *table,
6319 struct nft_object *obj, u32 portid, u32 seq, int event,
6320 int family, int report, gfp_t gfp)
6322 struct sk_buff *skb;
6324 char *buf = kasprintf(gfp, "%s:%llu;?:0",
6325 table->name, table->handle);
6327 audit_log_nfcfg(buf,
6330 event == NFT_MSG_NEWOBJ ?
6331 AUDIT_NFT_OP_OBJ_REGISTER :
6332 AUDIT_NFT_OP_OBJ_UNREGISTER,
6337 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6340 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6344 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6351 nft_notify_enqueue(skb, report, &net->nft.notify_list);
6354 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6356 EXPORT_SYMBOL_GPL(nft_obj_notify);
6358 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6359 struct nft_object *obj, int event)
6361 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6362 ctx->family, ctx->report, GFP_KERNEL);
6368 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6370 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6371 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6372 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6374 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6376 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6378 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6379 list_del_rcu(&type->list);
6380 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6382 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6384 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6385 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6386 .len = NFT_NAME_MAXLEN - 1 },
6387 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6388 .len = NFT_NAME_MAXLEN - 1 },
6389 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6390 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6391 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6394 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6395 const struct nlattr *nla, u8 genmask)
6397 struct nft_flowtable *flowtable;
6399 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6400 if (!nla_strcmp(nla, flowtable->name) &&
6401 nft_active_genmask(flowtable, genmask))
6404 return ERR_PTR(-ENOENT);
6406 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6408 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6409 struct nft_flowtable *flowtable,
6410 enum nft_trans_phase phase)
6413 case NFT_TRANS_PREPARE:
6414 case NFT_TRANS_ABORT:
6415 case NFT_TRANS_RELEASE:
6422 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6424 static struct nft_flowtable *
6425 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6426 const struct nlattr *nla, u8 genmask)
6428 struct nft_flowtable *flowtable;
6430 list_for_each_entry(flowtable, &table->flowtables, list) {
6431 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6432 nft_active_genmask(flowtable, genmask))
6435 return ERR_PTR(-ENOENT);
6438 struct nft_flowtable_hook {
6441 struct list_head list;
6444 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6445 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6446 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6447 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6450 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6451 const struct nlattr *attr,
6452 struct nft_flowtable_hook *flowtable_hook,
6453 struct nft_flowtable *flowtable, bool add)
6455 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6456 struct nft_hook *hook;
6457 int hooknum, priority;
6460 INIT_LIST_HEAD(&flowtable_hook->list);
6462 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6463 nft_flowtable_hook_policy, NULL);
6468 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6469 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6472 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6473 if (hooknum != NF_NETDEV_INGRESS)
6476 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6478 flowtable_hook->priority = priority;
6479 flowtable_hook->num = hooknum;
6481 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6482 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6483 if (hooknum != flowtable->hooknum)
6487 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6488 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6489 if (priority != flowtable->data.priority)
6493 flowtable_hook->priority = flowtable->data.priority;
6494 flowtable_hook->num = flowtable->hooknum;
6497 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6498 err = nf_tables_parse_netdev_hooks(ctx->net,
6499 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6500 &flowtable_hook->list);
6505 list_for_each_entry(hook, &flowtable_hook->list, list) {
6506 hook->ops.pf = NFPROTO_NETDEV;
6507 hook->ops.hooknum = flowtable_hook->num;
6508 hook->ops.priority = flowtable_hook->priority;
6509 hook->ops.priv = &flowtable->data;
6510 hook->ops.hook = flowtable->data.type->hook;
6516 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6518 const struct nf_flowtable_type *type;
6520 list_for_each_entry(type, &nf_tables_flowtables, list) {
6521 if (family == type->family)
6527 static const struct nf_flowtable_type *
6528 nft_flowtable_type_get(struct net *net, u8 family)
6530 const struct nf_flowtable_type *type;
6532 type = __nft_flowtable_type_get(family);
6533 if (type != NULL && try_module_get(type->owner))
6536 lockdep_nfnl_nft_mutex_not_held();
6537 #ifdef CONFIG_MODULES
6539 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6540 return ERR_PTR(-EAGAIN);
6543 return ERR_PTR(-ENOENT);
6546 /* Only called from error and netdev event paths. */
6547 static void nft_unregister_flowtable_hook(struct net *net,
6548 struct nft_flowtable *flowtable,
6549 struct nft_hook *hook)
6551 nf_unregister_net_hook(net, &hook->ops);
6552 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6556 static void nft_unregister_flowtable_net_hooks(struct net *net,
6557 struct list_head *hook_list)
6559 struct nft_hook *hook;
6561 list_for_each_entry(hook, hook_list, list)
6562 nf_unregister_net_hook(net, &hook->ops);
6565 static int nft_register_flowtable_net_hooks(struct net *net,
6566 struct nft_table *table,
6567 struct list_head *hook_list,
6568 struct nft_flowtable *flowtable)
6570 struct nft_hook *hook, *hook2, *next;
6571 struct nft_flowtable *ft;
6574 list_for_each_entry(hook, hook_list, list) {
6575 list_for_each_entry(ft, &table->flowtables, list) {
6576 list_for_each_entry(hook2, &ft->hook_list, list) {
6577 if (hook->ops.dev == hook2->ops.dev &&
6578 hook->ops.pf == hook2->ops.pf) {
6580 goto err_unregister_net_hooks;
6585 err = flowtable->data.type->setup(&flowtable->data,
6589 goto err_unregister_net_hooks;
6591 err = nf_register_net_hook(net, &hook->ops);
6593 flowtable->data.type->setup(&flowtable->data,
6596 goto err_unregister_net_hooks;
6604 err_unregister_net_hooks:
6605 list_for_each_entry_safe(hook, next, hook_list, list) {
6609 nft_unregister_flowtable_hook(net, flowtable, hook);
6610 list_del_rcu(&hook->list);
6611 kfree_rcu(hook, rcu);
6617 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6619 struct nft_hook *hook, *next;
6621 list_for_each_entry_safe(hook, next, hook_list, list) {
6622 list_del_rcu(&hook->list);
6623 kfree_rcu(hook, rcu);
6627 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6628 struct nft_flowtable *flowtable)
6630 const struct nlattr * const *nla = ctx->nla;
6631 struct nft_flowtable_hook flowtable_hook;
6632 struct nft_hook *hook, *next;
6633 struct nft_trans *trans;
6634 bool unregister = false;
6637 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6638 &flowtable_hook, flowtable, false);
6642 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6643 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6644 list_del(&hook->list);
6649 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6650 &flowtable_hook.list, flowtable);
6652 goto err_flowtable_update_hook;
6654 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6655 sizeof(struct nft_trans_flowtable));
6659 goto err_flowtable_update_hook;
6662 nft_trans_flowtable(trans) = flowtable;
6663 nft_trans_flowtable_update(trans) = true;
6664 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6665 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6667 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6671 err_flowtable_update_hook:
6672 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6674 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6675 list_del_rcu(&hook->list);
6676 kfree_rcu(hook, rcu);
6683 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6684 struct sk_buff *skb,
6685 const struct nlmsghdr *nlh,
6686 const struct nlattr * const nla[],
6687 struct netlink_ext_ack *extack)
6689 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6690 struct nft_flowtable_hook flowtable_hook;
6691 const struct nf_flowtable_type *type;
6692 u8 genmask = nft_genmask_next(net);
6693 int family = nfmsg->nfgen_family;
6694 struct nft_flowtable *flowtable;
6695 struct nft_hook *hook, *next;
6696 struct nft_table *table;
6700 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6701 !nla[NFTA_FLOWTABLE_NAME] ||
6702 !nla[NFTA_FLOWTABLE_HOOK])
6705 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6707 if (IS_ERR(table)) {
6708 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6709 return PTR_ERR(table);
6712 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6714 if (IS_ERR(flowtable)) {
6715 err = PTR_ERR(flowtable);
6716 if (err != -ENOENT) {
6717 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6721 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6722 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6726 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6728 return nft_flowtable_update(&ctx, nlh, flowtable);
6731 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6733 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6737 flowtable->table = table;
6738 flowtable->handle = nf_tables_alloc_handle(table);
6739 INIT_LIST_HEAD(&flowtable->hook_list);
6741 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6742 if (!flowtable->name) {
6747 type = nft_flowtable_type_get(net, family);
6749 err = PTR_ERR(type);
6753 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6754 flowtable->data.flags =
6755 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6756 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6760 write_pnet(&flowtable->data.net, net);
6761 flowtable->data.type = type;
6762 err = type->init(&flowtable->data);
6766 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6767 &flowtable_hook, flowtable, true);
6771 list_splice(&flowtable_hook.list, &flowtable->hook_list);
6772 flowtable->data.priority = flowtable_hook.priority;
6773 flowtable->hooknum = flowtable_hook.num;
6775 err = nft_register_flowtable_net_hooks(ctx.net, table,
6776 &flowtable->hook_list,
6779 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6783 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6787 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6792 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6793 nft_unregister_flowtable_hook(net, flowtable, hook);
6794 list_del_rcu(&hook->list);
6795 kfree_rcu(hook, rcu);
6798 flowtable->data.type->free(&flowtable->data);
6800 module_put(type->owner);
6802 kfree(flowtable->name);
6808 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6810 struct nft_hook *this, *next;
6812 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6813 list_del(&this->list);
6818 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6819 struct nft_flowtable *flowtable)
6821 const struct nlattr * const *nla = ctx->nla;
6822 struct nft_flowtable_hook flowtable_hook;
6823 struct nft_hook *this, *hook;
6824 struct nft_trans *trans;
6827 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6828 &flowtable_hook, flowtable, false);
6832 list_for_each_entry(this, &flowtable_hook.list, list) {
6833 hook = nft_hook_list_find(&flowtable->hook_list, this);
6836 goto err_flowtable_del_hook;
6838 hook->inactive = true;
6841 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
6842 sizeof(struct nft_trans_flowtable));
6845 goto err_flowtable_del_hook;
6848 nft_trans_flowtable(trans) = flowtable;
6849 nft_trans_flowtable_update(trans) = true;
6850 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6851 nft_flowtable_hook_release(&flowtable_hook);
6853 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6857 err_flowtable_del_hook:
6858 list_for_each_entry(this, &flowtable_hook.list, list) {
6859 hook = nft_hook_list_find(&flowtable->hook_list, this);
6863 hook->inactive = false;
6865 nft_flowtable_hook_release(&flowtable_hook);
6870 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
6871 struct sk_buff *skb,
6872 const struct nlmsghdr *nlh,
6873 const struct nlattr * const nla[],
6874 struct netlink_ext_ack *extack)
6876 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6877 u8 genmask = nft_genmask_next(net);
6878 int family = nfmsg->nfgen_family;
6879 struct nft_flowtable *flowtable;
6880 const struct nlattr *attr;
6881 struct nft_table *table;
6884 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6885 (!nla[NFTA_FLOWTABLE_NAME] &&
6886 !nla[NFTA_FLOWTABLE_HANDLE]))
6889 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6891 if (IS_ERR(table)) {
6892 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6893 return PTR_ERR(table);
6896 if (nla[NFTA_FLOWTABLE_HANDLE]) {
6897 attr = nla[NFTA_FLOWTABLE_HANDLE];
6898 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
6900 attr = nla[NFTA_FLOWTABLE_NAME];
6901 flowtable = nft_flowtable_lookup(table, attr, genmask);
6904 if (IS_ERR(flowtable)) {
6905 NL_SET_BAD_ATTR(extack, attr);
6906 return PTR_ERR(flowtable);
6909 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6911 if (nla[NFTA_FLOWTABLE_HOOK])
6912 return nft_delflowtable_hook(&ctx, flowtable);
6914 if (flowtable->use > 0) {
6915 NL_SET_BAD_ATTR(extack, attr);
6919 return nft_delflowtable(&ctx, flowtable);
6922 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
6923 u32 portid, u32 seq, int event,
6924 u32 flags, int family,
6925 struct nft_flowtable *flowtable,
6926 struct list_head *hook_list)
6928 struct nlattr *nest, *nest_devs;
6929 struct nfgenmsg *nfmsg;
6930 struct nft_hook *hook;
6931 struct nlmsghdr *nlh;
6933 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6934 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6936 goto nla_put_failure;
6938 nfmsg = nlmsg_data(nlh);
6939 nfmsg->nfgen_family = family;
6940 nfmsg->version = NFNETLINK_V0;
6941 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6943 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
6944 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
6945 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
6946 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
6947 NFTA_FLOWTABLE_PAD) ||
6948 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
6949 goto nla_put_failure;
6951 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
6953 goto nla_put_failure;
6954 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
6955 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
6956 goto nla_put_failure;
6958 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
6960 goto nla_put_failure;
6962 list_for_each_entry_rcu(hook, hook_list, list) {
6963 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
6964 goto nla_put_failure;
6966 nla_nest_end(skb, nest_devs);
6967 nla_nest_end(skb, nest);
6969 nlmsg_end(skb, nlh);
6973 nlmsg_trim(skb, nlh);
6977 struct nft_flowtable_filter {
6981 static int nf_tables_dump_flowtable(struct sk_buff *skb,
6982 struct netlink_callback *cb)
6984 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6985 struct nft_flowtable_filter *filter = cb->data;
6986 unsigned int idx = 0, s_idx = cb->args[0];
6987 struct net *net = sock_net(skb->sk);
6988 int family = nfmsg->nfgen_family;
6989 struct nft_flowtable *flowtable;
6990 const struct nft_table *table;
6993 cb->seq = net->nft.base_seq;
6995 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6996 if (family != NFPROTO_UNSPEC && family != table->family)
6999 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7000 if (!nft_is_active(net, flowtable))
7005 memset(&cb->args[1], 0,
7006 sizeof(cb->args) - sizeof(cb->args[0]));
7007 if (filter && filter->table &&
7008 strcmp(filter->table, table->name))
7011 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7013 NFT_MSG_NEWFLOWTABLE,
7014 NLM_F_MULTI | NLM_F_APPEND,
7017 &flowtable->hook_list) < 0)
7020 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7032 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7034 const struct nlattr * const *nla = cb->data;
7035 struct nft_flowtable_filter *filter = NULL;
7037 if (nla[NFTA_FLOWTABLE_TABLE]) {
7038 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7042 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7044 if (!filter->table) {
7054 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7056 struct nft_flowtable_filter *filter = cb->data;
7061 kfree(filter->table);
7067 /* called with rcu_read_lock held */
7068 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7069 struct sk_buff *skb,
7070 const struct nlmsghdr *nlh,
7071 const struct nlattr * const nla[],
7072 struct netlink_ext_ack *extack)
7074 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7075 u8 genmask = nft_genmask_cur(net);
7076 int family = nfmsg->nfgen_family;
7077 struct nft_flowtable *flowtable;
7078 const struct nft_table *table;
7079 struct sk_buff *skb2;
7082 if (nlh->nlmsg_flags & NLM_F_DUMP) {
7083 struct netlink_dump_control c = {
7084 .start = nf_tables_dump_flowtable_start,
7085 .dump = nf_tables_dump_flowtable,
7086 .done = nf_tables_dump_flowtable_done,
7087 .module = THIS_MODULE,
7088 .data = (void *)nla,
7091 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7094 if (!nla[NFTA_FLOWTABLE_NAME])
7097 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7100 return PTR_ERR(table);
7102 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7104 if (IS_ERR(flowtable))
7105 return PTR_ERR(flowtable);
7107 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7111 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7113 NFT_MSG_NEWFLOWTABLE, 0, family,
7114 flowtable, &flowtable->hook_list);
7116 goto err_fill_flowtable_info;
7118 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7120 err_fill_flowtable_info:
7125 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7126 struct nft_flowtable *flowtable,
7127 struct list_head *hook_list,
7130 struct sk_buff *skb;
7132 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7133 flowtable->table->name, flowtable->table->handle,
7134 flowtable->name, flowtable->handle);
7136 audit_log_nfcfg(buf,
7139 event == NFT_MSG_NEWFLOWTABLE ?
7140 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7141 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7146 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7149 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7153 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7155 ctx->family, flowtable, hook_list);
7161 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7164 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7167 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7169 struct nft_hook *hook, *next;
7171 flowtable->data.type->free(&flowtable->data);
7172 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7173 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7175 list_del_rcu(&hook->list);
7178 kfree(flowtable->name);
7179 module_put(flowtable->data.type->owner);
7183 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7184 u32 portid, u32 seq)
7186 struct nlmsghdr *nlh;
7187 struct nfgenmsg *nfmsg;
7188 char buf[TASK_COMM_LEN];
7189 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7191 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7193 goto nla_put_failure;
7195 nfmsg = nlmsg_data(nlh);
7196 nfmsg->nfgen_family = AF_UNSPEC;
7197 nfmsg->version = NFNETLINK_V0;
7198 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7200 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7201 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7202 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7203 goto nla_put_failure;
7205 nlmsg_end(skb, nlh);
7209 nlmsg_trim(skb, nlh);
7213 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7214 struct nft_flowtable *flowtable)
7216 struct nft_hook *hook;
7218 list_for_each_entry(hook, &flowtable->hook_list, list) {
7219 if (hook->ops.dev != dev)
7222 /* flow_offload_netdev_event() cleans up entries for us. */
7223 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7224 list_del_rcu(&hook->list);
7225 kfree_rcu(hook, rcu);
7230 static int nf_tables_flowtable_event(struct notifier_block *this,
7231 unsigned long event, void *ptr)
7233 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7234 struct nft_flowtable *flowtable;
7235 struct nft_table *table;
7238 if (event != NETDEV_UNREGISTER)
7242 mutex_lock(&net->nft.commit_mutex);
7243 list_for_each_entry(table, &net->nft.tables, list) {
7244 list_for_each_entry(flowtable, &table->flowtables, list) {
7245 nft_flowtable_event(event, dev, flowtable);
7248 mutex_unlock(&net->nft.commit_mutex);
7253 static struct notifier_block nf_tables_flowtable_notifier = {
7254 .notifier_call = nf_tables_flowtable_event,
7257 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7260 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7261 struct sk_buff *skb2;
7264 audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7265 AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7267 if (!nlmsg_report(nlh) &&
7268 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7271 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7275 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7282 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7283 nlmsg_report(nlh), GFP_KERNEL);
7286 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7290 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7291 struct sk_buff *skb, const struct nlmsghdr *nlh,
7292 const struct nlattr * const nla[],
7293 struct netlink_ext_ack *extack)
7295 struct sk_buff *skb2;
7298 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7302 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7305 goto err_fill_gen_info;
7307 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7314 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7315 [NFT_MSG_NEWTABLE] = {
7316 .call_batch = nf_tables_newtable,
7317 .attr_count = NFTA_TABLE_MAX,
7318 .policy = nft_table_policy,
7320 [NFT_MSG_GETTABLE] = {
7321 .call_rcu = nf_tables_gettable,
7322 .attr_count = NFTA_TABLE_MAX,
7323 .policy = nft_table_policy,
7325 [NFT_MSG_DELTABLE] = {
7326 .call_batch = nf_tables_deltable,
7327 .attr_count = NFTA_TABLE_MAX,
7328 .policy = nft_table_policy,
7330 [NFT_MSG_NEWCHAIN] = {
7331 .call_batch = nf_tables_newchain,
7332 .attr_count = NFTA_CHAIN_MAX,
7333 .policy = nft_chain_policy,
7335 [NFT_MSG_GETCHAIN] = {
7336 .call_rcu = nf_tables_getchain,
7337 .attr_count = NFTA_CHAIN_MAX,
7338 .policy = nft_chain_policy,
7340 [NFT_MSG_DELCHAIN] = {
7341 .call_batch = nf_tables_delchain,
7342 .attr_count = NFTA_CHAIN_MAX,
7343 .policy = nft_chain_policy,
7345 [NFT_MSG_NEWRULE] = {
7346 .call_batch = nf_tables_newrule,
7347 .attr_count = NFTA_RULE_MAX,
7348 .policy = nft_rule_policy,
7350 [NFT_MSG_GETRULE] = {
7351 .call_rcu = nf_tables_getrule,
7352 .attr_count = NFTA_RULE_MAX,
7353 .policy = nft_rule_policy,
7355 [NFT_MSG_DELRULE] = {
7356 .call_batch = nf_tables_delrule,
7357 .attr_count = NFTA_RULE_MAX,
7358 .policy = nft_rule_policy,
7360 [NFT_MSG_NEWSET] = {
7361 .call_batch = nf_tables_newset,
7362 .attr_count = NFTA_SET_MAX,
7363 .policy = nft_set_policy,
7365 [NFT_MSG_GETSET] = {
7366 .call_rcu = nf_tables_getset,
7367 .attr_count = NFTA_SET_MAX,
7368 .policy = nft_set_policy,
7370 [NFT_MSG_DELSET] = {
7371 .call_batch = nf_tables_delset,
7372 .attr_count = NFTA_SET_MAX,
7373 .policy = nft_set_policy,
7375 [NFT_MSG_NEWSETELEM] = {
7376 .call_batch = nf_tables_newsetelem,
7377 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7378 .policy = nft_set_elem_list_policy,
7380 [NFT_MSG_GETSETELEM] = {
7381 .call_rcu = nf_tables_getsetelem,
7382 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7383 .policy = nft_set_elem_list_policy,
7385 [NFT_MSG_DELSETELEM] = {
7386 .call_batch = nf_tables_delsetelem,
7387 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7388 .policy = nft_set_elem_list_policy,
7390 [NFT_MSG_GETGEN] = {
7391 .call_rcu = nf_tables_getgen,
7393 [NFT_MSG_NEWOBJ] = {
7394 .call_batch = nf_tables_newobj,
7395 .attr_count = NFTA_OBJ_MAX,
7396 .policy = nft_obj_policy,
7398 [NFT_MSG_GETOBJ] = {
7399 .call_rcu = nf_tables_getobj,
7400 .attr_count = NFTA_OBJ_MAX,
7401 .policy = nft_obj_policy,
7403 [NFT_MSG_DELOBJ] = {
7404 .call_batch = nf_tables_delobj,
7405 .attr_count = NFTA_OBJ_MAX,
7406 .policy = nft_obj_policy,
7408 [NFT_MSG_GETOBJ_RESET] = {
7409 .call_rcu = nf_tables_getobj,
7410 .attr_count = NFTA_OBJ_MAX,
7411 .policy = nft_obj_policy,
7413 [NFT_MSG_NEWFLOWTABLE] = {
7414 .call_batch = nf_tables_newflowtable,
7415 .attr_count = NFTA_FLOWTABLE_MAX,
7416 .policy = nft_flowtable_policy,
7418 [NFT_MSG_GETFLOWTABLE] = {
7419 .call_rcu = nf_tables_getflowtable,
7420 .attr_count = NFTA_FLOWTABLE_MAX,
7421 .policy = nft_flowtable_policy,
7423 [NFT_MSG_DELFLOWTABLE] = {
7424 .call_batch = nf_tables_delflowtable,
7425 .attr_count = NFTA_FLOWTABLE_MAX,
7426 .policy = nft_flowtable_policy,
7430 static int nf_tables_validate(struct net *net)
7432 struct nft_table *table;
7434 switch (net->nft.validate_state) {
7435 case NFT_VALIDATE_SKIP:
7437 case NFT_VALIDATE_NEED:
7438 nft_validate_state_update(net, NFT_VALIDATE_DO);
7440 case NFT_VALIDATE_DO:
7441 list_for_each_entry(table, &net->nft.tables, list) {
7442 if (nft_table_validate(net, table) < 0)
7451 /* a drop policy has to be deferred until all rules have been activated,
7452 * otherwise a large ruleset that contains a drop-policy base chain will
7453 * cause all packets to get dropped until the full transaction has been
7456 * We defer the drop policy until the transaction has been finalized.
7458 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7460 struct nft_base_chain *basechain;
7462 if (nft_trans_chain_policy(trans) != NF_DROP)
7465 if (!nft_is_base_chain(trans->ctx.chain))
7468 basechain = nft_base_chain(trans->ctx.chain);
7469 basechain->policy = NF_DROP;
7472 static void nft_chain_commit_update(struct nft_trans *trans)
7474 struct nft_base_chain *basechain;
7476 if (nft_trans_chain_name(trans)) {
7477 rhltable_remove(&trans->ctx.table->chains_ht,
7478 &trans->ctx.chain->rhlhead,
7479 nft_chain_ht_params);
7480 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7481 rhltable_insert_key(&trans->ctx.table->chains_ht,
7482 trans->ctx.chain->name,
7483 &trans->ctx.chain->rhlhead,
7484 nft_chain_ht_params);
7487 if (!nft_is_base_chain(trans->ctx.chain))
7490 nft_chain_stats_replace(trans);
7492 basechain = nft_base_chain(trans->ctx.chain);
7494 switch (nft_trans_chain_policy(trans)) {
7497 basechain->policy = nft_trans_chain_policy(trans);
7502 static void nft_obj_commit_update(struct nft_trans *trans)
7504 struct nft_object *newobj;
7505 struct nft_object *obj;
7507 obj = nft_trans_obj(trans);
7508 newobj = nft_trans_obj_newobj(trans);
7510 if (obj->ops->update)
7511 obj->ops->update(obj, newobj);
7516 static void nft_commit_release(struct nft_trans *trans)
7518 switch (trans->msg_type) {
7519 case NFT_MSG_DELTABLE:
7520 nf_tables_table_destroy(&trans->ctx);
7522 case NFT_MSG_NEWCHAIN:
7523 free_percpu(nft_trans_chain_stats(trans));
7524 kfree(nft_trans_chain_name(trans));
7526 case NFT_MSG_DELCHAIN:
7527 nf_tables_chain_destroy(&trans->ctx);
7529 case NFT_MSG_DELRULE:
7530 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7532 case NFT_MSG_DELSET:
7533 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7535 case NFT_MSG_DELSETELEM:
7536 nf_tables_set_elem_destroy(&trans->ctx,
7537 nft_trans_elem_set(trans),
7538 nft_trans_elem(trans).priv);
7540 case NFT_MSG_DELOBJ:
7541 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7543 case NFT_MSG_DELFLOWTABLE:
7544 if (nft_trans_flowtable_update(trans))
7545 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7547 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7552 put_net(trans->ctx.net);
7557 static void nf_tables_trans_destroy_work(struct work_struct *w)
7559 struct nft_trans *trans, *next;
7562 spin_lock(&nf_tables_destroy_list_lock);
7563 list_splice_init(&nf_tables_destroy_list, &head);
7564 spin_unlock(&nf_tables_destroy_list_lock);
7566 if (list_empty(&head))
7571 list_for_each_entry_safe(trans, next, &head, list) {
7572 list_del(&trans->list);
7573 nft_commit_release(trans);
7577 void nf_tables_trans_destroy_flush_work(void)
7579 flush_work(&trans_destroy_work);
7581 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7583 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7585 struct nft_rule *rule;
7586 unsigned int alloc = 0;
7589 /* already handled or inactive chain? */
7590 if (chain->rules_next || !nft_is_active_next(net, chain))
7593 rule = list_entry(&chain->rules, struct nft_rule, list);
7596 list_for_each_entry_continue(rule, &chain->rules, list) {
7597 if (nft_is_active_next(net, rule))
7601 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7602 if (!chain->rules_next)
7605 list_for_each_entry_continue(rule, &chain->rules, list) {
7606 if (nft_is_active_next(net, rule))
7607 chain->rules_next[i++] = rule;
7610 chain->rules_next[i] = NULL;
7614 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7616 struct nft_trans *trans, *next;
7618 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7619 struct nft_chain *chain = trans->ctx.chain;
7621 if (trans->msg_type == NFT_MSG_NEWRULE ||
7622 trans->msg_type == NFT_MSG_DELRULE) {
7623 kvfree(chain->rules_next);
7624 chain->rules_next = NULL;
7629 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7631 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7636 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7638 struct nft_rule **r = rules;
7639 struct nft_rules_old *old;
7644 r++; /* rcu_head is after end marker */
7648 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7651 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7653 struct nft_rule **g0, **g1;
7656 next_genbit = nft_gencursor_next(net);
7658 g0 = rcu_dereference_protected(chain->rules_gen_0,
7659 lockdep_commit_lock_is_held(net));
7660 g1 = rcu_dereference_protected(chain->rules_gen_1,
7661 lockdep_commit_lock_is_held(net));
7663 /* No changes to this chain? */
7664 if (chain->rules_next == NULL) {
7665 /* chain had no change in last or next generation */
7669 * chain had no change in this generation; make sure next
7670 * one uses same rules as current generation.
7673 rcu_assign_pointer(chain->rules_gen_1, g0);
7674 nf_tables_commit_chain_free_rules_old(g1);
7676 rcu_assign_pointer(chain->rules_gen_0, g1);
7677 nf_tables_commit_chain_free_rules_old(g0);
7684 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7686 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7688 chain->rules_next = NULL;
7694 nf_tables_commit_chain_free_rules_old(g1);
7696 nf_tables_commit_chain_free_rules_old(g0);
7699 static void nft_obj_del(struct nft_object *obj)
7701 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7702 list_del_rcu(&obj->list);
7705 void nft_chain_del(struct nft_chain *chain)
7707 struct nft_table *table = chain->table;
7709 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7710 nft_chain_ht_params));
7711 list_del_rcu(&chain->list);
7714 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7715 struct list_head *hook_list)
7717 struct nft_hook *hook, *next;
7719 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7721 list_move(&hook->list, hook_list);
7725 static void nf_tables_module_autoload_cleanup(struct net *net)
7727 struct nft_module_request *req, *next;
7729 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7730 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7731 WARN_ON_ONCE(!req->done);
7732 list_del(&req->list);
7737 static void nf_tables_commit_release(struct net *net)
7739 struct nft_trans *trans;
7741 /* all side effects have to be made visible.
7742 * For example, if a chain named 'foo' has been deleted, a
7743 * new transaction must not find it anymore.
7745 * Memory reclaim happens asynchronously from work queue
7746 * to prevent expensive synchronize_rcu() in commit phase.
7748 if (list_empty(&net->nft.commit_list)) {
7749 nf_tables_module_autoload_cleanup(net);
7750 mutex_unlock(&net->nft.commit_mutex);
7754 trans = list_last_entry(&net->nft.commit_list,
7755 struct nft_trans, list);
7756 get_net(trans->ctx.net);
7757 WARN_ON_ONCE(trans->put_net);
7759 trans->put_net = true;
7760 spin_lock(&nf_tables_destroy_list_lock);
7761 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7762 spin_unlock(&nf_tables_destroy_list_lock);
7764 nf_tables_module_autoload_cleanup(net);
7765 schedule_work(&trans_destroy_work);
7767 mutex_unlock(&net->nft.commit_mutex);
7770 static void nft_commit_notify(struct net *net, u32 portid)
7772 struct sk_buff *batch_skb = NULL, *nskb, *skb;
7773 unsigned char *data;
7776 list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7780 len = NLMSG_GOODSIZE - skb->len;
7781 list_del(&skb->list);
7785 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7786 data = skb_put(batch_skb, skb->len);
7787 memcpy(data, skb->data, skb->len);
7788 list_del(&skb->list);
7792 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7793 NFT_CB(batch_skb).report, GFP_KERNEL);
7798 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7799 NFT_CB(batch_skb).report, GFP_KERNEL);
7802 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7805 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7807 struct nft_trans *trans, *next;
7808 struct nft_trans_elem *te;
7809 struct nft_chain *chain;
7810 struct nft_table *table;
7813 if (list_empty(&net->nft.commit_list)) {
7814 mutex_unlock(&net->nft.commit_mutex);
7818 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7819 if (nf_tables_validate(net) < 0)
7822 err = nft_flow_rule_offload_commit(net);
7826 /* 1. Allocate space for next generation rules_gen_X[] */
7827 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7830 if (trans->msg_type == NFT_MSG_NEWRULE ||
7831 trans->msg_type == NFT_MSG_DELRULE) {
7832 chain = trans->ctx.chain;
7834 ret = nf_tables_commit_chain_prepare(net, chain);
7836 nf_tables_commit_chain_prepare_cancel(net);
7842 /* step 2. Make rules_gen_X visible to packet path */
7843 list_for_each_entry(table, &net->nft.tables, list) {
7844 list_for_each_entry(chain, &table->chains, list)
7845 nf_tables_commit_chain(net, chain);
7849 * Bump generation counter, invalidate any dump in progress.
7850 * Cannot fail after this point.
7852 while (++net->nft.base_seq == 0);
7854 /* step 3. Start new generation, rules_gen_X now in use. */
7855 net->nft.gencursor = nft_gencursor_next(net);
7857 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7858 switch (trans->msg_type) {
7859 case NFT_MSG_NEWTABLE:
7860 if (nft_trans_table_update(trans)) {
7861 if (!nft_trans_table_enable(trans)) {
7862 nf_tables_table_disable(net,
7864 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
7867 nft_clear(net, trans->ctx.table);
7869 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
7870 nft_trans_destroy(trans);
7872 case NFT_MSG_DELTABLE:
7873 list_del_rcu(&trans->ctx.table->list);
7874 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
7876 case NFT_MSG_NEWCHAIN:
7877 if (nft_trans_chain_update(trans)) {
7878 nft_chain_commit_update(trans);
7879 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7880 /* trans destroyed after rcu grace period */
7882 nft_chain_commit_drop_policy(trans);
7883 nft_clear(net, trans->ctx.chain);
7884 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
7885 nft_trans_destroy(trans);
7888 case NFT_MSG_DELCHAIN:
7889 nft_chain_del(trans->ctx.chain);
7890 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
7891 nf_tables_unregister_hook(trans->ctx.net,
7895 case NFT_MSG_NEWRULE:
7896 nft_clear(trans->ctx.net, nft_trans_rule(trans));
7897 nf_tables_rule_notify(&trans->ctx,
7898 nft_trans_rule(trans),
7900 nft_trans_destroy(trans);
7902 case NFT_MSG_DELRULE:
7903 list_del_rcu(&nft_trans_rule(trans)->list);
7904 nf_tables_rule_notify(&trans->ctx,
7905 nft_trans_rule(trans),
7907 nft_rule_expr_deactivate(&trans->ctx,
7908 nft_trans_rule(trans),
7911 case NFT_MSG_NEWSET:
7912 nft_clear(net, nft_trans_set(trans));
7913 /* This avoids hitting -EBUSY when deleting the table
7914 * from the transaction.
7916 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
7917 !list_empty(&nft_trans_set(trans)->bindings))
7918 trans->ctx.table->use--;
7920 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7921 NFT_MSG_NEWSET, GFP_KERNEL);
7922 nft_trans_destroy(trans);
7924 case NFT_MSG_DELSET:
7925 list_del_rcu(&nft_trans_set(trans)->list);
7926 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
7927 NFT_MSG_DELSET, GFP_KERNEL);
7929 case NFT_MSG_NEWSETELEM:
7930 te = (struct nft_trans_elem *)trans->data;
7932 te->set->ops->activate(net, te->set, &te->elem);
7933 nf_tables_setelem_notify(&trans->ctx, te->set,
7935 NFT_MSG_NEWSETELEM, 0);
7936 nft_trans_destroy(trans);
7938 case NFT_MSG_DELSETELEM:
7939 te = (struct nft_trans_elem *)trans->data;
7941 nf_tables_setelem_notify(&trans->ctx, te->set,
7943 NFT_MSG_DELSETELEM, 0);
7944 te->set->ops->remove(net, te->set, &te->elem);
7945 atomic_dec(&te->set->nelems);
7948 case NFT_MSG_NEWOBJ:
7949 if (nft_trans_obj_update(trans)) {
7950 nft_obj_commit_update(trans);
7951 nf_tables_obj_notify(&trans->ctx,
7952 nft_trans_obj(trans),
7955 nft_clear(net, nft_trans_obj(trans));
7956 nf_tables_obj_notify(&trans->ctx,
7957 nft_trans_obj(trans),
7959 nft_trans_destroy(trans);
7962 case NFT_MSG_DELOBJ:
7963 nft_obj_del(nft_trans_obj(trans));
7964 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
7967 case NFT_MSG_NEWFLOWTABLE:
7968 if (nft_trans_flowtable_update(trans)) {
7969 nf_tables_flowtable_notify(&trans->ctx,
7970 nft_trans_flowtable(trans),
7971 &nft_trans_flowtable_hooks(trans),
7972 NFT_MSG_NEWFLOWTABLE);
7973 list_splice(&nft_trans_flowtable_hooks(trans),
7974 &nft_trans_flowtable(trans)->hook_list);
7976 nft_clear(net, nft_trans_flowtable(trans));
7977 nf_tables_flowtable_notify(&trans->ctx,
7978 nft_trans_flowtable(trans),
7979 &nft_trans_flowtable(trans)->hook_list,
7980 NFT_MSG_NEWFLOWTABLE);
7982 nft_trans_destroy(trans);
7984 case NFT_MSG_DELFLOWTABLE:
7985 if (nft_trans_flowtable_update(trans)) {
7986 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
7987 &nft_trans_flowtable_hooks(trans));
7988 nf_tables_flowtable_notify(&trans->ctx,
7989 nft_trans_flowtable(trans),
7990 &nft_trans_flowtable_hooks(trans),
7991 NFT_MSG_DELFLOWTABLE);
7992 nft_unregister_flowtable_net_hooks(net,
7993 &nft_trans_flowtable_hooks(trans));
7995 list_del_rcu(&nft_trans_flowtable(trans)->list);
7996 nf_tables_flowtable_notify(&trans->ctx,
7997 nft_trans_flowtable(trans),
7998 &nft_trans_flowtable(trans)->hook_list,
7999 NFT_MSG_DELFLOWTABLE);
8000 nft_unregister_flowtable_net_hooks(net,
8001 &nft_trans_flowtable(trans)->hook_list);
8007 nft_commit_notify(net, NETLINK_CB(skb).portid);
8008 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8009 nf_tables_commit_release(net);
8014 static void nf_tables_module_autoload(struct net *net)
8016 struct nft_module_request *req, *next;
8017 LIST_HEAD(module_list);
8019 list_splice_init(&net->nft.module_list, &module_list);
8020 mutex_unlock(&net->nft.commit_mutex);
8021 list_for_each_entry_safe(req, next, &module_list, list) {
8022 request_module("%s", req->module);
8025 mutex_lock(&net->nft.commit_mutex);
8026 list_splice(&module_list, &net->nft.module_list);
8029 static void nf_tables_abort_release(struct nft_trans *trans)
8031 switch (trans->msg_type) {
8032 case NFT_MSG_NEWTABLE:
8033 nf_tables_table_destroy(&trans->ctx);
8035 case NFT_MSG_NEWCHAIN:
8036 nf_tables_chain_destroy(&trans->ctx);
8038 case NFT_MSG_NEWRULE:
8039 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8041 case NFT_MSG_NEWSET:
8042 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8044 case NFT_MSG_NEWSETELEM:
8045 nft_set_elem_destroy(nft_trans_elem_set(trans),
8046 nft_trans_elem(trans).priv, true);
8048 case NFT_MSG_NEWOBJ:
8049 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8051 case NFT_MSG_NEWFLOWTABLE:
8052 if (nft_trans_flowtable_update(trans))
8053 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8055 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8061 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8063 struct nft_trans *trans, *next;
8064 struct nft_trans_elem *te;
8065 struct nft_hook *hook;
8067 if (action == NFNL_ABORT_VALIDATE &&
8068 nf_tables_validate(net) < 0)
8071 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8073 switch (trans->msg_type) {
8074 case NFT_MSG_NEWTABLE:
8075 if (nft_trans_table_update(trans)) {
8076 if (nft_trans_table_enable(trans)) {
8077 nf_tables_table_disable(net,
8079 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8081 nft_trans_destroy(trans);
8083 list_del_rcu(&trans->ctx.table->list);
8086 case NFT_MSG_DELTABLE:
8087 nft_clear(trans->ctx.net, trans->ctx.table);
8088 nft_trans_destroy(trans);
8090 case NFT_MSG_NEWCHAIN:
8091 if (nft_trans_chain_update(trans)) {
8092 free_percpu(nft_trans_chain_stats(trans));
8093 kfree(nft_trans_chain_name(trans));
8094 nft_trans_destroy(trans);
8096 if (nft_chain_is_bound(trans->ctx.chain)) {
8097 nft_trans_destroy(trans);
8100 trans->ctx.table->use--;
8101 nft_chain_del(trans->ctx.chain);
8102 nf_tables_unregister_hook(trans->ctx.net,
8107 case NFT_MSG_DELCHAIN:
8108 trans->ctx.table->use++;
8109 nft_clear(trans->ctx.net, trans->ctx.chain);
8110 nft_trans_destroy(trans);
8112 case NFT_MSG_NEWRULE:
8113 trans->ctx.chain->use--;
8114 list_del_rcu(&nft_trans_rule(trans)->list);
8115 nft_rule_expr_deactivate(&trans->ctx,
8116 nft_trans_rule(trans),
8119 case NFT_MSG_DELRULE:
8120 trans->ctx.chain->use++;
8121 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8122 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8123 nft_trans_destroy(trans);
8125 case NFT_MSG_NEWSET:
8126 trans->ctx.table->use--;
8127 if (nft_trans_set_bound(trans)) {
8128 nft_trans_destroy(trans);
8131 list_del_rcu(&nft_trans_set(trans)->list);
8133 case NFT_MSG_DELSET:
8134 trans->ctx.table->use++;
8135 nft_clear(trans->ctx.net, nft_trans_set(trans));
8136 nft_trans_destroy(trans);
8138 case NFT_MSG_NEWSETELEM:
8139 if (nft_trans_elem_set_bound(trans)) {
8140 nft_trans_destroy(trans);
8143 te = (struct nft_trans_elem *)trans->data;
8144 te->set->ops->remove(net, te->set, &te->elem);
8145 atomic_dec(&te->set->nelems);
8147 case NFT_MSG_DELSETELEM:
8148 te = (struct nft_trans_elem *)trans->data;
8150 nft_set_elem_activate(net, te->set, &te->elem);
8151 te->set->ops->activate(net, te->set, &te->elem);
8154 nft_trans_destroy(trans);
8156 case NFT_MSG_NEWOBJ:
8157 if (nft_trans_obj_update(trans)) {
8158 kfree(nft_trans_obj_newobj(trans));
8159 nft_trans_destroy(trans);
8161 trans->ctx.table->use--;
8162 nft_obj_del(nft_trans_obj(trans));
8165 case NFT_MSG_DELOBJ:
8166 trans->ctx.table->use++;
8167 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8168 nft_trans_destroy(trans);
8170 case NFT_MSG_NEWFLOWTABLE:
8171 if (nft_trans_flowtable_update(trans)) {
8172 nft_unregister_flowtable_net_hooks(net,
8173 &nft_trans_flowtable_hooks(trans));
8175 trans->ctx.table->use--;
8176 list_del_rcu(&nft_trans_flowtable(trans)->list);
8177 nft_unregister_flowtable_net_hooks(net,
8178 &nft_trans_flowtable(trans)->hook_list);
8181 case NFT_MSG_DELFLOWTABLE:
8182 if (nft_trans_flowtable_update(trans)) {
8183 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8184 hook->inactive = false;
8186 trans->ctx.table->use++;
8187 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8189 nft_trans_destroy(trans);
8196 list_for_each_entry_safe_reverse(trans, next,
8197 &net->nft.commit_list, list) {
8198 list_del(&trans->list);
8199 nf_tables_abort_release(trans);
8202 if (action == NFNL_ABORT_AUTOLOAD)
8203 nf_tables_module_autoload(net);
8205 nf_tables_module_autoload_cleanup(net);
8210 static void nf_tables_cleanup(struct net *net)
8212 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8215 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8216 enum nfnl_abort_action action)
8218 int ret = __nf_tables_abort(net, action);
8220 mutex_unlock(&net->nft.commit_mutex);
8225 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8229 mutex_lock(&net->nft.commit_mutex);
8231 genid_ok = genid == 0 || net->nft.base_seq == genid;
8233 mutex_unlock(&net->nft.commit_mutex);
8235 /* else, commit mutex has to be released by commit or abort function */
8239 static const struct nfnetlink_subsystem nf_tables_subsys = {
8240 .name = "nf_tables",
8241 .subsys_id = NFNL_SUBSYS_NFTABLES,
8242 .cb_count = NFT_MSG_MAX,
8244 .commit = nf_tables_commit,
8245 .abort = nf_tables_abort,
8246 .cleanup = nf_tables_cleanup,
8247 .valid_genid = nf_tables_valid_genid,
8248 .owner = THIS_MODULE,
8251 int nft_chain_validate_dependency(const struct nft_chain *chain,
8252 enum nft_chain_types type)
8254 const struct nft_base_chain *basechain;
8256 if (nft_is_base_chain(chain)) {
8257 basechain = nft_base_chain(chain);
8258 if (basechain->type->type != type)
8263 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8265 int nft_chain_validate_hooks(const struct nft_chain *chain,
8266 unsigned int hook_flags)
8268 struct nft_base_chain *basechain;
8270 if (nft_is_base_chain(chain)) {
8271 basechain = nft_base_chain(chain);
8273 if ((1 << basechain->ops.hooknum) & hook_flags)
8281 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8284 * Loop detection - walk through the ruleset beginning at the destination chain
8285 * of a new jump until either the source chain is reached (loop) or all
8286 * reachable chains have been traversed.
8288 * The loop check is performed whenever a new jump verdict is added to an
8289 * expression or verdict map or a verdict map is bound to a new chain.
8292 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8293 const struct nft_chain *chain);
8295 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8296 struct nft_set *set,
8297 const struct nft_set_iter *iter,
8298 struct nft_set_elem *elem)
8300 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8301 const struct nft_data *data;
8303 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8304 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8307 data = nft_set_ext_data(ext);
8308 switch (data->verdict.code) {
8311 return nf_tables_check_loops(ctx, data->verdict.chain);
8317 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8318 const struct nft_chain *chain)
8320 const struct nft_rule *rule;
8321 const struct nft_expr *expr, *last;
8322 struct nft_set *set;
8323 struct nft_set_binding *binding;
8324 struct nft_set_iter iter;
8326 if (ctx->chain == chain)
8329 list_for_each_entry(rule, &chain->rules, list) {
8330 nft_rule_for_each_expr(expr, last, rule) {
8331 struct nft_immediate_expr *priv;
8332 const struct nft_data *data;
8335 if (strcmp(expr->ops->type->name, "immediate"))
8338 priv = nft_expr_priv(expr);
8339 if (priv->dreg != NFT_REG_VERDICT)
8343 switch (data->verdict.code) {
8346 err = nf_tables_check_loops(ctx,
8347 data->verdict.chain);
8356 list_for_each_entry(set, &ctx->table->sets, list) {
8357 if (!nft_is_active_next(ctx->net, set))
8359 if (!(set->flags & NFT_SET_MAP) ||
8360 set->dtype != NFT_DATA_VERDICT)
8363 list_for_each_entry(binding, &set->bindings, list) {
8364 if (!(binding->flags & NFT_SET_MAP) ||
8365 binding->chain != chain)
8368 iter.genmask = nft_genmask_next(ctx->net);
8372 iter.fn = nf_tables_loop_check_setelem;
8374 set->ops->walk(ctx, set, &iter);
8384 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
8386 * @attr: netlink attribute to fetch value from
8387 * @max: maximum value to be stored in dest
8388 * @dest: pointer to the variable
8390 * Parse, check and store a given u32 netlink attribute into variable.
8391 * This function returns -ERANGE if the value goes over maximum value.
8392 * Otherwise a 0 is returned and the attribute value is stored in the
8393 * destination variable.
8395 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8399 val = ntohl(nla_get_be32(attr));
8406 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8409 * nft_parse_register - parse a register value from a netlink attribute
8411 * @attr: netlink attribute
8413 * Parse and translate a register value from a netlink attribute.
8414 * Registers used to be 128 bit wide, these register numbers will be
8415 * mapped to the corresponding 32 bit register numbers.
8417 unsigned int nft_parse_register(const struct nlattr *attr)
8421 reg = ntohl(nla_get_be32(attr));
8423 case NFT_REG_VERDICT...NFT_REG_4:
8424 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8426 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8429 EXPORT_SYMBOL_GPL(nft_parse_register);
8432 * nft_dump_register - dump a register value to a netlink attribute
8434 * @skb: socket buffer
8435 * @attr: attribute number
8436 * @reg: register number
8438 * Construct a netlink attribute containing the register number. For
8439 * compatibility reasons, register numbers being a multiple of 4 are
8440 * translated to the corresponding 128 bit register numbers.
8442 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8444 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8445 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8447 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8449 return nla_put_be32(skb, attr, htonl(reg));
8451 EXPORT_SYMBOL_GPL(nft_dump_register);
8454 * nft_validate_register_load - validate a load from a register
8456 * @reg: the register number
8457 * @len: the length of the data
8459 * Validate that the input register is one of the general purpose
8460 * registers and that the length of the load is within the bounds.
8462 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8464 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8468 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8473 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8476 * nft_validate_register_store - validate an expressions' register store
8478 * @ctx: context of the expression performing the load
8479 * @reg: the destination register number
8480 * @data: the data to load
8481 * @type: the data type
8482 * @len: the length of the data
8484 * Validate that a data load uses the appropriate data type for
8485 * the destination register and the length is within the bounds.
8486 * A value of NULL for the data means that its runtime gathered
8489 int nft_validate_register_store(const struct nft_ctx *ctx,
8490 enum nft_registers reg,
8491 const struct nft_data *data,
8492 enum nft_data_types type, unsigned int len)
8497 case NFT_REG_VERDICT:
8498 if (type != NFT_DATA_VERDICT)
8502 (data->verdict.code == NFT_GOTO ||
8503 data->verdict.code == NFT_JUMP)) {
8504 err = nf_tables_check_loops(ctx, data->verdict.chain);
8511 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8515 if (reg * NFT_REG32_SIZE + len >
8516 sizeof_field(struct nft_regs, data))
8519 if (data != NULL && type != NFT_DATA_VALUE)
8524 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8526 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8527 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
8528 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
8529 .len = NFT_CHAIN_MAXNAMELEN - 1 },
8530 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8533 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8534 struct nft_data_desc *desc, const struct nlattr *nla)
8536 u8 genmask = nft_genmask_next(ctx->net);
8537 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8538 struct nft_chain *chain;
8541 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8542 nft_verdict_policy, NULL);
8546 if (!tb[NFTA_VERDICT_CODE])
8548 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8550 switch (data->verdict.code) {
8552 switch (data->verdict.code & NF_VERDICT_MASK) {
8567 if (tb[NFTA_VERDICT_CHAIN]) {
8568 chain = nft_chain_lookup(ctx->net, ctx->table,
8569 tb[NFTA_VERDICT_CHAIN],
8571 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8572 chain = nft_chain_lookup_byid(ctx->net,
8573 tb[NFTA_VERDICT_CHAIN_ID]);
8575 return PTR_ERR(chain);
8581 return PTR_ERR(chain);
8582 if (nft_is_base_chain(chain))
8586 data->verdict.chain = chain;
8590 desc->len = sizeof(data->verdict);
8591 desc->type = NFT_DATA_VERDICT;
8595 static void nft_verdict_uninit(const struct nft_data *data)
8597 struct nft_chain *chain;
8598 struct nft_rule *rule;
8600 switch (data->verdict.code) {
8603 chain = data->verdict.chain;
8606 if (!nft_chain_is_bound(chain))
8609 chain->table->use--;
8610 list_for_each_entry(rule, &chain->rules, list)
8613 nft_chain_del(chain);
8618 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8620 struct nlattr *nest;
8622 nest = nla_nest_start_noflag(skb, type);
8624 goto nla_put_failure;
8626 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8627 goto nla_put_failure;
8632 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8634 goto nla_put_failure;
8636 nla_nest_end(skb, nest);
8643 static int nft_value_init(const struct nft_ctx *ctx,
8644 struct nft_data *data, unsigned int size,
8645 struct nft_data_desc *desc, const struct nlattr *nla)
8655 nla_memcpy(data->data, nla, len);
8656 desc->type = NFT_DATA_VALUE;
8661 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8664 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8667 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8668 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
8669 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8673 * nft_data_init - parse nf_tables data netlink attributes
8675 * @ctx: context of the expression using the data
8676 * @data: destination struct nft_data
8677 * @size: maximum data length
8678 * @desc: data description
8679 * @nla: netlink attribute containing data
8681 * Parse the netlink data attributes and initialize a struct nft_data.
8682 * The type and length of data are returned in the data description.
8684 * The caller can indicate that it only wants to accept data of type
8685 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8687 int nft_data_init(const struct nft_ctx *ctx,
8688 struct nft_data *data, unsigned int size,
8689 struct nft_data_desc *desc, const struct nlattr *nla)
8691 struct nlattr *tb[NFTA_DATA_MAX + 1];
8694 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8695 nft_data_policy, NULL);
8699 if (tb[NFTA_DATA_VALUE])
8700 return nft_value_init(ctx, data, size, desc,
8701 tb[NFTA_DATA_VALUE]);
8702 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8703 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8706 EXPORT_SYMBOL_GPL(nft_data_init);
8709 * nft_data_release - release a nft_data item
8711 * @data: struct nft_data to release
8712 * @type: type of data
8714 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8715 * all others need to be released by calling this function.
8717 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8719 if (type < NFT_DATA_VERDICT)
8722 case NFT_DATA_VERDICT:
8723 return nft_verdict_uninit(data);
8728 EXPORT_SYMBOL_GPL(nft_data_release);
8730 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8731 enum nft_data_types type, unsigned int len)
8733 struct nlattr *nest;
8736 nest = nla_nest_start_noflag(skb, attr);
8741 case NFT_DATA_VALUE:
8742 err = nft_value_dump(skb, data, len);
8744 case NFT_DATA_VERDICT:
8745 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8752 nla_nest_end(skb, nest);
8755 EXPORT_SYMBOL_GPL(nft_data_dump);
8757 int __nft_release_basechain(struct nft_ctx *ctx)
8759 struct nft_rule *rule, *nr;
8761 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8764 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8765 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8766 list_del(&rule->list);
8768 nf_tables_rule_release(ctx, rule);
8770 nft_chain_del(ctx->chain);
8772 nf_tables_chain_destroy(ctx);
8776 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8778 static void __nft_release_tables(struct net *net)
8780 struct nft_flowtable *flowtable, *nf;
8781 struct nft_table *table, *nt;
8782 struct nft_chain *chain, *nc;
8783 struct nft_object *obj, *ne;
8784 struct nft_rule *rule, *nr;
8785 struct nft_set *set, *ns;
8786 struct nft_ctx ctx = {
8788 .family = NFPROTO_NETDEV,
8791 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8792 ctx.family = table->family;
8794 list_for_each_entry(chain, &table->chains, list)
8795 nf_tables_unregister_hook(net, table, chain);
8796 /* No packets are walking on these chains anymore. */
8798 list_for_each_entry(chain, &table->chains, list) {
8800 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8801 list_del(&rule->list);
8803 nf_tables_rule_release(&ctx, rule);
8806 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8807 list_del(&flowtable->list);
8809 nf_tables_flowtable_destroy(flowtable);
8811 list_for_each_entry_safe(set, ns, &table->sets, list) {
8812 list_del(&set->list);
8814 nft_set_destroy(&ctx, set);
8816 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8819 nft_obj_destroy(&ctx, obj);
8821 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8823 nft_chain_del(chain);
8825 nf_tables_chain_destroy(&ctx);
8827 list_del(&table->list);
8828 nf_tables_table_destroy(&ctx);
8832 static int __net_init nf_tables_init_net(struct net *net)
8834 INIT_LIST_HEAD(&net->nft.tables);
8835 INIT_LIST_HEAD(&net->nft.commit_list);
8836 INIT_LIST_HEAD(&net->nft.module_list);
8837 INIT_LIST_HEAD(&net->nft.notify_list);
8838 mutex_init(&net->nft.commit_mutex);
8839 net->nft.base_seq = 1;
8840 net->nft.validate_state = NFT_VALIDATE_SKIP;
8845 static void __net_exit nf_tables_exit_net(struct net *net)
8847 mutex_lock(&net->nft.commit_mutex);
8848 if (!list_empty(&net->nft.commit_list))
8849 __nf_tables_abort(net, NFNL_ABORT_NONE);
8850 __nft_release_tables(net);
8851 mutex_unlock(&net->nft.commit_mutex);
8852 WARN_ON_ONCE(!list_empty(&net->nft.tables));
8853 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
8854 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
8857 static struct pernet_operations nf_tables_net_ops = {
8858 .init = nf_tables_init_net,
8859 .exit = nf_tables_exit_net,
8862 static int __init nf_tables_module_init(void)
8866 spin_lock_init(&nf_tables_destroy_list_lock);
8867 err = register_pernet_subsys(&nf_tables_net_ops);
8871 err = nft_chain_filter_init();
8875 err = nf_tables_core_module_init();
8879 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
8883 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
8887 err = nft_offload_init();
8892 err = nfnetlink_subsys_register(&nf_tables_subsys);
8896 nft_chain_route_init();
8902 rhltable_destroy(&nft_objname_ht);
8904 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8906 nf_tables_core_module_exit();
8908 nft_chain_filter_fini();
8910 unregister_pernet_subsys(&nf_tables_net_ops);
8914 static void __exit nf_tables_module_exit(void)
8916 nfnetlink_subsys_unregister(&nf_tables_subsys);
8918 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
8919 nft_chain_filter_fini();
8920 nft_chain_route_fini();
8921 unregister_pernet_subsys(&nf_tables_net_ops);
8922 cancel_work_sync(&trans_destroy_work);
8924 rhltable_destroy(&nft_objname_ht);
8925 nf_tables_core_module_exit();
8928 module_init(nf_tables_module_init);
8929 module_exit(nf_tables_module_exit);
8931 MODULE_LICENSE("GPL");
8932 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
8933 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);