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 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
587 char module_name[MODULE_NAME_LEN];
588 struct nft_module_request *req;
593 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
595 if (ret >= MODULE_NAME_LEN)
598 list_for_each_entry(req, &net->nft.module_list, list) {
599 if (!strcmp(req->module, module_name)) {
603 /* A request to load this module already exists. */
608 req = kmalloc(sizeof(*req), GFP_KERNEL);
613 strlcpy(req->module, module_name, MODULE_NAME_LEN);
614 list_add_tail(&req->list, &net->nft.module_list);
620 static void lockdep_nfnl_nft_mutex_not_held(void)
622 #ifdef CONFIG_PROVE_LOCKING
624 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
628 static const struct nft_chain_type *
629 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
630 u8 family, bool autoload)
632 const struct nft_chain_type *type;
634 type = __nf_tables_chain_type_lookup(nla, family);
638 lockdep_nfnl_nft_mutex_not_held();
639 #ifdef CONFIG_MODULES
641 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
643 (const char *)nla_data(nla)) == -EAGAIN)
644 return ERR_PTR(-EAGAIN);
647 return ERR_PTR(-ENOENT);
650 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
651 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
652 .len = NFT_TABLE_MAXNAMELEN - 1 },
653 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
654 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
655 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
656 .len = NFT_USERDATA_MAXLEN }
659 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
660 u32 portid, u32 seq, int event, u32 flags,
661 int family, const struct nft_table *table)
663 struct nlmsghdr *nlh;
664 struct nfgenmsg *nfmsg;
666 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
667 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
669 goto nla_put_failure;
671 nfmsg = nlmsg_data(nlh);
672 nfmsg->nfgen_family = family;
673 nfmsg->version = NFNETLINK_V0;
674 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
676 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
677 nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
678 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
679 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
681 goto nla_put_failure;
684 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
685 goto nla_put_failure;
692 nlmsg_trim(skb, nlh);
696 struct nftnl_skb_parms {
699 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
701 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
702 struct list_head *notify_list)
704 NFT_CB(skb).report = report;
705 list_add_tail(&skb->list, notify_list);
708 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
712 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;?:0",
713 ctx->table->name, ctx->table->handle);
718 event == NFT_MSG_NEWTABLE ?
719 AUDIT_NFT_OP_TABLE_REGISTER :
720 AUDIT_NFT_OP_TABLE_UNREGISTER,
725 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
728 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
732 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
733 event, 0, ctx->family, ctx->table);
739 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
742 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
745 static int nf_tables_dump_tables(struct sk_buff *skb,
746 struct netlink_callback *cb)
748 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
749 const struct nft_table *table;
750 unsigned int idx = 0, s_idx = cb->args[0];
751 struct net *net = sock_net(skb->sk);
752 int family = nfmsg->nfgen_family;
755 cb->seq = net->nft.base_seq;
757 list_for_each_entry_rcu(table, &net->nft.tables, list) {
758 if (family != NFPROTO_UNSPEC && family != table->family)
764 memset(&cb->args[1], 0,
765 sizeof(cb->args) - sizeof(cb->args[0]));
766 if (!nft_is_active(net, table))
768 if (nf_tables_fill_table_info(skb, net,
769 NETLINK_CB(cb->skb).portid,
771 NFT_MSG_NEWTABLE, NLM_F_MULTI,
772 table->family, table) < 0)
775 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
785 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
786 const struct nlmsghdr *nlh,
787 struct netlink_dump_control *c)
791 if (!try_module_get(THIS_MODULE))
795 err = netlink_dump_start(nlsk, skb, nlh, c);
797 module_put(THIS_MODULE);
802 /* called with rcu_read_lock held */
803 static int nf_tables_gettable(struct net *net, struct sock *nlsk,
804 struct sk_buff *skb, const struct nlmsghdr *nlh,
805 const struct nlattr * const nla[],
806 struct netlink_ext_ack *extack)
808 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
809 u8 genmask = nft_genmask_cur(net);
810 const struct nft_table *table;
811 struct sk_buff *skb2;
812 int family = nfmsg->nfgen_family;
815 if (nlh->nlmsg_flags & NLM_F_DUMP) {
816 struct netlink_dump_control c = {
817 .dump = nf_tables_dump_tables,
818 .module = THIS_MODULE,
821 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
824 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask);
826 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
827 return PTR_ERR(table);
830 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
834 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
835 nlh->nlmsg_seq, NFT_MSG_NEWTABLE, 0,
838 goto err_fill_table_info;
840 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
847 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
849 struct nft_chain *chain;
852 list_for_each_entry(chain, &table->chains, list) {
853 if (!nft_is_active_next(net, chain))
855 if (!nft_is_base_chain(chain))
858 if (cnt && i++ == cnt)
861 nf_tables_unregister_hook(net, table, chain);
865 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
867 struct nft_chain *chain;
870 list_for_each_entry(chain, &table->chains, list) {
871 if (!nft_is_active_next(net, chain))
873 if (!nft_is_base_chain(chain))
876 err = nf_tables_register_hook(net, table, chain);
878 goto err_register_hooks;
886 nft_table_disable(net, table, i);
890 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
892 nft_table_disable(net, table, 0);
895 static int nf_tables_updtable(struct nft_ctx *ctx)
897 struct nft_trans *trans;
901 if (!ctx->nla[NFTA_TABLE_FLAGS])
904 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
905 if (flags & ~NFT_TABLE_F_DORMANT)
908 if (flags == ctx->table->flags)
911 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
912 sizeof(struct nft_trans_table));
916 if ((flags & NFT_TABLE_F_DORMANT) &&
917 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
918 nft_trans_table_enable(trans) = false;
919 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
920 ctx->table->flags & NFT_TABLE_F_DORMANT) {
921 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
922 ret = nf_tables_table_enable(ctx->net, ctx->table);
924 nft_trans_table_enable(trans) = true;
926 ctx->table->flags |= NFT_TABLE_F_DORMANT;
931 nft_trans_table_update(trans) = true;
932 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
935 nft_trans_destroy(trans);
939 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
941 const char *name = data;
943 return jhash(name, strlen(name), seed);
946 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
948 const struct nft_chain *chain = data;
950 return nft_chain_hash(chain->name, 0, seed);
953 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
956 const struct nft_chain *chain = ptr;
957 const char *name = arg->key;
959 return strcmp(chain->name, name);
962 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
964 const struct nft_object_hash_key *k = data;
966 seed ^= hash_ptr(k->table, 32);
968 return jhash(k->name, strlen(k->name), seed);
971 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
973 const struct nft_object *obj = data;
975 return nft_objname_hash(&obj->key, 0, seed);
978 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
981 const struct nft_object_hash_key *k = arg->key;
982 const struct nft_object *obj = ptr;
984 if (obj->key.table != k->table)
987 return strcmp(obj->key.name, k->name);
990 static int nf_tables_newtable(struct net *net, struct sock *nlsk,
991 struct sk_buff *skb, const struct nlmsghdr *nlh,
992 const struct nlattr * const nla[],
993 struct netlink_ext_ack *extack)
995 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
996 u8 genmask = nft_genmask_next(net);
997 int family = nfmsg->nfgen_family;
998 const struct nlattr *attr;
999 struct nft_table *table;
1004 lockdep_assert_held(&net->nft.commit_mutex);
1005 attr = nla[NFTA_TABLE_NAME];
1006 table = nft_table_lookup(net, attr, family, genmask);
1007 if (IS_ERR(table)) {
1008 if (PTR_ERR(table) != -ENOENT)
1009 return PTR_ERR(table);
1011 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1012 NL_SET_BAD_ATTR(extack, attr);
1015 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1018 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1019 return nf_tables_updtable(&ctx);
1022 if (nla[NFTA_TABLE_FLAGS]) {
1023 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1024 if (flags & ~NFT_TABLE_F_DORMANT)
1029 table = kzalloc(sizeof(*table), GFP_KERNEL);
1033 table->name = nla_strdup(attr, GFP_KERNEL);
1034 if (table->name == NULL)
1037 if (nla[NFTA_TABLE_USERDATA]) {
1038 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1039 if (table->udata == NULL)
1040 goto err_table_udata;
1042 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1045 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1049 INIT_LIST_HEAD(&table->chains);
1050 INIT_LIST_HEAD(&table->sets);
1051 INIT_LIST_HEAD(&table->objects);
1052 INIT_LIST_HEAD(&table->flowtables);
1053 table->family = family;
1054 table->flags = flags;
1055 table->handle = ++table_handle;
1057 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
1058 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1062 list_add_tail_rcu(&table->list, &net->nft.tables);
1065 rhltable_destroy(&table->chains_ht);
1067 kfree(table->udata);
1076 static int nft_flush_table(struct nft_ctx *ctx)
1078 struct nft_flowtable *flowtable, *nft;
1079 struct nft_chain *chain, *nc;
1080 struct nft_object *obj, *ne;
1081 struct nft_set *set, *ns;
1084 list_for_each_entry(chain, &ctx->table->chains, list) {
1085 if (!nft_is_active_next(ctx->net, chain))
1088 if (nft_chain_is_bound(chain))
1093 err = nft_delrule_by_chain(ctx);
1098 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1099 if (!nft_is_active_next(ctx->net, set))
1102 if (nft_set_is_anonymous(set) &&
1103 !list_empty(&set->bindings))
1106 err = nft_delset(ctx, set);
1111 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1112 if (!nft_is_active_next(ctx->net, flowtable))
1115 err = nft_delflowtable(ctx, flowtable);
1120 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1121 if (!nft_is_active_next(ctx->net, obj))
1124 err = nft_delobj(ctx, obj);
1129 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1130 if (!nft_is_active_next(ctx->net, chain))
1133 if (nft_chain_is_bound(chain))
1138 err = nft_delchain(ctx);
1143 err = nft_deltable(ctx);
1148 static int nft_flush(struct nft_ctx *ctx, int family)
1150 struct nft_table *table, *nt;
1151 const struct nlattr * const *nla = ctx->nla;
1154 list_for_each_entry_safe(table, nt, &ctx->net->nft.tables, list) {
1155 if (family != AF_UNSPEC && table->family != family)
1158 ctx->family = table->family;
1160 if (!nft_is_active_next(ctx->net, table))
1163 if (nla[NFTA_TABLE_NAME] &&
1164 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1169 err = nft_flush_table(ctx);
1177 static int nf_tables_deltable(struct net *net, struct sock *nlsk,
1178 struct sk_buff *skb, const struct nlmsghdr *nlh,
1179 const struct nlattr * const nla[],
1180 struct netlink_ext_ack *extack)
1182 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1183 u8 genmask = nft_genmask_next(net);
1184 int family = nfmsg->nfgen_family;
1185 const struct nlattr *attr;
1186 struct nft_table *table;
1189 nft_ctx_init(&ctx, net, skb, nlh, 0, NULL, NULL, nla);
1190 if (family == AF_UNSPEC ||
1191 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1192 return nft_flush(&ctx, family);
1194 if (nla[NFTA_TABLE_HANDLE]) {
1195 attr = nla[NFTA_TABLE_HANDLE];
1196 table = nft_table_lookup_byhandle(net, attr, genmask);
1198 attr = nla[NFTA_TABLE_NAME];
1199 table = nft_table_lookup(net, attr, family, genmask);
1202 if (IS_ERR(table)) {
1203 NL_SET_BAD_ATTR(extack, attr);
1204 return PTR_ERR(table);
1207 if (nlh->nlmsg_flags & NLM_F_NONREC &&
1211 ctx.family = family;
1214 return nft_flush_table(&ctx);
1217 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1219 if (WARN_ON(ctx->table->use > 0))
1222 rhltable_destroy(&ctx->table->chains_ht);
1223 kfree(ctx->table->name);
1224 kfree(ctx->table->udata);
1228 void nft_register_chain_type(const struct nft_chain_type *ctype)
1230 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1231 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1232 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1235 chain_type[ctype->family][ctype->type] = ctype;
1236 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1238 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1240 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1242 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1243 chain_type[ctype->family][ctype->type] = NULL;
1244 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1246 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1252 static struct nft_chain *
1253 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1255 struct nft_chain *chain;
1257 list_for_each_entry(chain, &table->chains, list) {
1258 if (chain->handle == handle &&
1259 nft_active_genmask(chain, genmask))
1263 return ERR_PTR(-ENOENT);
1266 static bool lockdep_commit_lock_is_held(const struct net *net)
1268 #ifdef CONFIG_PROVE_LOCKING
1269 return lockdep_is_held(&net->nft.commit_mutex);
1275 static struct nft_chain *nft_chain_lookup(struct net *net,
1276 struct nft_table *table,
1277 const struct nlattr *nla, u8 genmask)
1279 char search[NFT_CHAIN_MAXNAMELEN + 1];
1280 struct rhlist_head *tmp, *list;
1281 struct nft_chain *chain;
1284 return ERR_PTR(-EINVAL);
1286 nla_strscpy(search, nla, sizeof(search));
1288 WARN_ON(!rcu_read_lock_held() &&
1289 !lockdep_commit_lock_is_held(net));
1291 chain = ERR_PTR(-ENOENT);
1293 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1297 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1298 if (nft_active_genmask(chain, genmask))
1301 chain = ERR_PTR(-ENOENT);
1307 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1308 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1309 .len = NFT_TABLE_MAXNAMELEN - 1 },
1310 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1311 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1312 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1313 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1314 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1315 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1316 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1317 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1318 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1319 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1320 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1321 .len = NFT_USERDATA_MAXLEN },
1324 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1325 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1326 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1327 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1328 .len = IFNAMSIZ - 1 },
1331 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1333 struct nft_stats *cpu_stats, total;
1334 struct nlattr *nest;
1342 memset(&total, 0, sizeof(total));
1343 for_each_possible_cpu(cpu) {
1344 cpu_stats = per_cpu_ptr(stats, cpu);
1346 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1347 pkts = cpu_stats->pkts;
1348 bytes = cpu_stats->bytes;
1349 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1351 total.bytes += bytes;
1353 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1355 goto nla_put_failure;
1357 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1358 NFTA_COUNTER_PAD) ||
1359 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1361 goto nla_put_failure;
1363 nla_nest_end(skb, nest);
1370 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1371 const struct nft_base_chain *basechain)
1373 const struct nf_hook_ops *ops = &basechain->ops;
1374 struct nft_hook *hook, *first = NULL;
1375 struct nlattr *nest, *nest_devs;
1378 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1380 goto nla_put_failure;
1381 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1382 goto nla_put_failure;
1383 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1384 goto nla_put_failure;
1386 if (nft_base_chain_netdev(family, ops->hooknum)) {
1387 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1388 list_for_each_entry(hook, &basechain->hook_list, list) {
1392 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1393 hook->ops.dev->name))
1394 goto nla_put_failure;
1397 nla_nest_end(skb, nest_devs);
1400 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1401 goto nla_put_failure;
1403 nla_nest_end(skb, nest);
1410 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1411 u32 portid, u32 seq, int event, u32 flags,
1412 int family, const struct nft_table *table,
1413 const struct nft_chain *chain)
1415 struct nlmsghdr *nlh;
1416 struct nfgenmsg *nfmsg;
1418 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1419 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
1421 goto nla_put_failure;
1423 nfmsg = nlmsg_data(nlh);
1424 nfmsg->nfgen_family = family;
1425 nfmsg->version = NFNETLINK_V0;
1426 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
1428 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1429 goto nla_put_failure;
1430 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1432 goto nla_put_failure;
1433 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1434 goto nla_put_failure;
1436 if (nft_is_base_chain(chain)) {
1437 const struct nft_base_chain *basechain = nft_base_chain(chain);
1438 struct nft_stats __percpu *stats;
1440 if (nft_dump_basechain_hook(skb, family, basechain))
1441 goto nla_put_failure;
1443 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1444 htonl(basechain->policy)))
1445 goto nla_put_failure;
1447 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1448 goto nla_put_failure;
1450 stats = rcu_dereference_check(basechain->stats,
1451 lockdep_commit_lock_is_held(net));
1452 if (nft_dump_stats(skb, stats))
1453 goto nla_put_failure;
1457 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1458 goto nla_put_failure;
1460 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1461 goto nla_put_failure;
1464 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1465 goto nla_put_failure;
1467 nlmsg_end(skb, nlh);
1471 nlmsg_trim(skb, nlh);
1475 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1477 struct sk_buff *skb;
1479 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
1480 ctx->table->name, ctx->table->handle,
1481 ctx->chain->name, ctx->chain->handle);
1483 audit_log_nfcfg(buf,
1486 event == NFT_MSG_NEWCHAIN ?
1487 AUDIT_NFT_OP_CHAIN_REGISTER :
1488 AUDIT_NFT_OP_CHAIN_UNREGISTER,
1493 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1496 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1500 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1501 event, 0, ctx->family, ctx->table,
1508 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
1511 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1514 static int nf_tables_dump_chains(struct sk_buff *skb,
1515 struct netlink_callback *cb)
1517 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1518 const struct nft_table *table;
1519 const struct nft_chain *chain;
1520 unsigned int idx = 0, s_idx = cb->args[0];
1521 struct net *net = sock_net(skb->sk);
1522 int family = nfmsg->nfgen_family;
1525 cb->seq = net->nft.base_seq;
1527 list_for_each_entry_rcu(table, &net->nft.tables, list) {
1528 if (family != NFPROTO_UNSPEC && family != table->family)
1531 list_for_each_entry_rcu(chain, &table->chains, list) {
1535 memset(&cb->args[1], 0,
1536 sizeof(cb->args) - sizeof(cb->args[0]));
1537 if (!nft_is_active(net, chain))
1539 if (nf_tables_fill_chain_info(skb, net,
1540 NETLINK_CB(cb->skb).portid,
1544 table->family, table,
1548 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1559 /* called with rcu_read_lock held */
1560 static int nf_tables_getchain(struct net *net, struct sock *nlsk,
1561 struct sk_buff *skb, const struct nlmsghdr *nlh,
1562 const struct nlattr * const nla[],
1563 struct netlink_ext_ack *extack)
1565 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1566 u8 genmask = nft_genmask_cur(net);
1567 const struct nft_chain *chain;
1568 struct nft_table *table;
1569 struct sk_buff *skb2;
1570 int family = nfmsg->nfgen_family;
1573 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1574 struct netlink_dump_control c = {
1575 .dump = nf_tables_dump_chains,
1576 .module = THIS_MODULE,
1579 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
1582 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
1583 if (IS_ERR(table)) {
1584 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1585 return PTR_ERR(table);
1588 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1589 if (IS_ERR(chain)) {
1590 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1591 return PTR_ERR(chain);
1594 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1598 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1599 nlh->nlmsg_seq, NFT_MSG_NEWCHAIN, 0,
1600 family, table, chain);
1602 goto err_fill_chain_info;
1604 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1606 err_fill_chain_info:
1611 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1612 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1613 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1616 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1618 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1619 struct nft_stats __percpu *newstats;
1620 struct nft_stats *stats;
1623 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1624 nft_counter_policy, NULL);
1626 return ERR_PTR(err);
1628 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1629 return ERR_PTR(-EINVAL);
1631 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1632 if (newstats == NULL)
1633 return ERR_PTR(-ENOMEM);
1635 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1636 * are not exposed to userspace.
1639 stats = this_cpu_ptr(newstats);
1640 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1641 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1647 static void nft_chain_stats_replace(struct nft_trans *trans)
1649 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1651 if (!nft_trans_chain_stats(trans))
1654 nft_trans_chain_stats(trans) =
1655 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1656 lockdep_commit_lock_is_held(trans->ctx.net));
1658 if (!nft_trans_chain_stats(trans))
1659 static_branch_inc(&nft_counters_enabled);
1662 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1664 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1665 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1671 /* should be NULL either via abort or via successful commit */
1672 WARN_ON_ONCE(chain->rules_next);
1673 kvfree(chain->rules_next);
1676 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1678 struct nft_chain *chain = ctx->chain;
1679 struct nft_hook *hook, *next;
1681 if (WARN_ON(chain->use > 0))
1684 /* no concurrent access possible anymore */
1685 nf_tables_chain_free_chain_rules(chain);
1687 if (nft_is_base_chain(chain)) {
1688 struct nft_base_chain *basechain = nft_base_chain(chain);
1690 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1691 list_for_each_entry_safe(hook, next,
1692 &basechain->hook_list, list) {
1693 list_del_rcu(&hook->list);
1694 kfree_rcu(hook, rcu);
1697 module_put(basechain->type->owner);
1698 if (rcu_access_pointer(basechain->stats)) {
1699 static_branch_dec(&nft_counters_enabled);
1700 free_percpu(rcu_dereference_raw(basechain->stats));
1703 kfree(chain->udata);
1707 kfree(chain->udata);
1712 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1713 const struct nlattr *attr)
1715 struct net_device *dev;
1716 char ifname[IFNAMSIZ];
1717 struct nft_hook *hook;
1720 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1723 goto err_hook_alloc;
1726 nla_strscpy(ifname, attr, IFNAMSIZ);
1727 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1728 * indirectly serializing all the other holders of the commit_mutex with
1731 dev = __dev_get_by_name(net, ifname);
1736 hook->ops.dev = dev;
1737 hook->inactive = false;
1744 return ERR_PTR(err);
1747 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1748 const struct nft_hook *this)
1750 struct nft_hook *hook;
1752 list_for_each_entry(hook, hook_list, list) {
1753 if (this->ops.dev == hook->ops.dev)
1760 static int nf_tables_parse_netdev_hooks(struct net *net,
1761 const struct nlattr *attr,
1762 struct list_head *hook_list)
1764 struct nft_hook *hook, *next;
1765 const struct nlattr *tmp;
1766 int rem, n = 0, err;
1768 nla_for_each_nested(tmp, attr, rem) {
1769 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1774 hook = nft_netdev_hook_alloc(net, tmp);
1776 err = PTR_ERR(hook);
1779 if (nft_hook_list_find(hook_list, hook)) {
1784 list_add_tail(&hook->list, hook_list);
1787 if (n == NFT_NETDEVICE_MAX) {
1796 list_for_each_entry_safe(hook, next, hook_list, list) {
1797 list_del(&hook->list);
1803 struct nft_chain_hook {
1806 const struct nft_chain_type *type;
1807 struct list_head list;
1810 static int nft_chain_parse_netdev(struct net *net,
1811 struct nlattr *tb[],
1812 struct list_head *hook_list)
1814 struct nft_hook *hook;
1817 if (tb[NFTA_HOOK_DEV]) {
1818 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1820 return PTR_ERR(hook);
1822 list_add_tail(&hook->list, hook_list);
1823 } else if (tb[NFTA_HOOK_DEVS]) {
1824 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1829 if (list_empty(hook_list))
1838 static int nft_chain_parse_hook(struct net *net,
1839 const struct nlattr * const nla[],
1840 struct nft_chain_hook *hook, u8 family,
1843 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1844 const struct nft_chain_type *type;
1847 lockdep_assert_held(&net->nft.commit_mutex);
1848 lockdep_nfnl_nft_mutex_not_held();
1850 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1851 nla[NFTA_CHAIN_HOOK],
1852 nft_hook_policy, NULL);
1856 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1857 ha[NFTA_HOOK_PRIORITY] == NULL)
1860 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1861 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1863 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1867 if (nla[NFTA_CHAIN_TYPE]) {
1868 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1871 return PTR_ERR(type);
1873 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1876 if (type->type == NFT_CHAIN_T_NAT &&
1877 hook->priority <= NF_IP_PRI_CONNTRACK)
1880 if (!try_module_get(type->owner))
1885 INIT_LIST_HEAD(&hook->list);
1886 if (nft_base_chain_netdev(family, hook->num)) {
1887 err = nft_chain_parse_netdev(net, ha, &hook->list);
1889 module_put(type->owner);
1892 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1893 module_put(type->owner);
1900 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1902 struct nft_hook *h, *next;
1904 list_for_each_entry_safe(h, next, &hook->list, list) {
1908 module_put(hook->type->owner);
1911 struct nft_rules_old {
1913 struct nft_rule **start;
1916 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
1919 if (alloc > INT_MAX)
1922 alloc += 1; /* NULL, ends rules */
1923 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
1926 alloc *= sizeof(struct nft_rule *);
1927 alloc += sizeof(struct nft_rules_old);
1929 return kvmalloc(alloc, GFP_KERNEL);
1932 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
1933 const struct nft_chain_hook *hook,
1934 struct nft_chain *chain)
1937 ops->hooknum = hook->num;
1938 ops->priority = hook->priority;
1940 ops->hook = hook->type->hooks[ops->hooknum];
1943 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
1944 struct nft_chain_hook *hook, u32 flags)
1946 struct nft_chain *chain;
1949 basechain->type = hook->type;
1950 INIT_LIST_HEAD(&basechain->hook_list);
1951 chain = &basechain->chain;
1953 if (nft_base_chain_netdev(family, hook->num)) {
1954 list_splice_init(&hook->list, &basechain->hook_list);
1955 list_for_each_entry(h, &basechain->hook_list, list)
1956 nft_basechain_hook_init(&h->ops, family, hook, chain);
1958 basechain->ops.hooknum = hook->num;
1959 basechain->ops.priority = hook->priority;
1961 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
1964 chain->flags |= NFT_CHAIN_BASE | flags;
1965 basechain->policy = NF_ACCEPT;
1966 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
1967 nft_chain_offload_priority(basechain) < 0)
1970 flow_block_init(&basechain->flow_block);
1975 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
1979 err = rhltable_insert_key(&table->chains_ht, chain->name,
1980 &chain->rhlhead, nft_chain_ht_params);
1984 list_add_tail_rcu(&chain->list, &table->chains);
1989 static u64 chain_id;
1991 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
1992 u8 policy, u32 flags)
1994 const struct nlattr * const *nla = ctx->nla;
1995 struct nft_table *table = ctx->table;
1996 struct nft_base_chain *basechain;
1997 struct nft_stats __percpu *stats;
1998 struct net *net = ctx->net;
1999 char name[NFT_NAME_MAXLEN];
2000 struct nft_trans *trans;
2001 struct nft_chain *chain;
2002 struct nft_rule **rules;
2005 if (table->use == UINT_MAX)
2008 if (nla[NFTA_CHAIN_HOOK]) {
2009 struct nft_chain_hook hook;
2011 if (flags & NFT_CHAIN_BINDING)
2014 err = nft_chain_parse_hook(net, nla, &hook, family, true);
2018 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2019 if (basechain == NULL) {
2020 nft_chain_release_hook(&hook);
2023 chain = &basechain->chain;
2025 if (nla[NFTA_CHAIN_COUNTERS]) {
2026 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2027 if (IS_ERR(stats)) {
2028 nft_chain_release_hook(&hook);
2030 return PTR_ERR(stats);
2032 rcu_assign_pointer(basechain->stats, stats);
2033 static_branch_inc(&nft_counters_enabled);
2036 err = nft_basechain_init(basechain, family, &hook, flags);
2038 nft_chain_release_hook(&hook);
2043 if (flags & NFT_CHAIN_BASE)
2045 if (flags & NFT_CHAIN_HW_OFFLOAD)
2048 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2052 chain->flags = flags;
2056 INIT_LIST_HEAD(&chain->rules);
2057 chain->handle = nf_tables_alloc_handle(table);
2058 chain->table = table;
2060 if (nla[NFTA_CHAIN_NAME]) {
2061 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2063 if (!(flags & NFT_CHAIN_BINDING)) {
2065 goto err_destroy_chain;
2068 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2069 chain->name = kstrdup(name, GFP_KERNEL);
2074 goto err_destroy_chain;
2077 if (nla[NFTA_CHAIN_USERDATA]) {
2078 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2079 if (chain->udata == NULL) {
2081 goto err_destroy_chain;
2083 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2086 rules = nf_tables_chain_alloc_rules(chain, 0);
2089 goto err_destroy_chain;
2093 rcu_assign_pointer(chain->rules_gen_0, rules);
2094 rcu_assign_pointer(chain->rules_gen_1, rules);
2096 err = nf_tables_register_hook(net, table, chain);
2098 goto err_destroy_chain;
2100 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2101 if (IS_ERR(trans)) {
2102 err = PTR_ERR(trans);
2103 goto err_unregister_hook;
2106 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2107 if (nft_is_base_chain(chain))
2108 nft_trans_chain_policy(trans) = policy;
2110 err = nft_chain_add(table, chain);
2112 nft_trans_destroy(trans);
2113 goto err_unregister_hook;
2119 err_unregister_hook:
2120 nf_tables_unregister_hook(net, table, chain);
2122 nf_tables_chain_destroy(ctx);
2127 static bool nft_hook_list_equal(struct list_head *hook_list1,
2128 struct list_head *hook_list2)
2130 struct nft_hook *hook;
2134 list_for_each_entry(hook, hook_list2, list) {
2135 if (!nft_hook_list_find(hook_list1, hook))
2140 list_for_each_entry(hook, hook_list1, list)
2146 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2147 u32 flags, const struct nlattr *attr,
2148 struct netlink_ext_ack *extack)
2150 const struct nlattr * const *nla = ctx->nla;
2151 struct nft_table *table = ctx->table;
2152 struct nft_chain *chain = ctx->chain;
2153 struct nft_base_chain *basechain;
2154 struct nft_stats *stats = NULL;
2155 struct nft_chain_hook hook;
2156 struct nf_hook_ops *ops;
2157 struct nft_trans *trans;
2160 if (chain->flags ^ flags)
2163 if (nla[NFTA_CHAIN_HOOK]) {
2164 if (!nft_is_base_chain(chain)) {
2165 NL_SET_BAD_ATTR(extack, attr);
2168 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2173 basechain = nft_base_chain(chain);
2174 if (basechain->type != hook.type) {
2175 nft_chain_release_hook(&hook);
2176 NL_SET_BAD_ATTR(extack, attr);
2180 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2181 if (!nft_hook_list_equal(&basechain->hook_list,
2183 nft_chain_release_hook(&hook);
2184 NL_SET_BAD_ATTR(extack, attr);
2188 ops = &basechain->ops;
2189 if (ops->hooknum != hook.num ||
2190 ops->priority != hook.priority) {
2191 nft_chain_release_hook(&hook);
2192 NL_SET_BAD_ATTR(extack, attr);
2196 nft_chain_release_hook(&hook);
2199 if (nla[NFTA_CHAIN_HANDLE] &&
2200 nla[NFTA_CHAIN_NAME]) {
2201 struct nft_chain *chain2;
2203 chain2 = nft_chain_lookup(ctx->net, table,
2204 nla[NFTA_CHAIN_NAME], genmask);
2205 if (!IS_ERR(chain2)) {
2206 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2211 if (nla[NFTA_CHAIN_COUNTERS]) {
2212 if (!nft_is_base_chain(chain))
2215 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2217 return PTR_ERR(stats);
2221 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2222 sizeof(struct nft_trans_chain));
2226 nft_trans_chain_stats(trans) = stats;
2227 nft_trans_chain_update(trans) = true;
2229 if (nla[NFTA_CHAIN_POLICY])
2230 nft_trans_chain_policy(trans) = policy;
2232 nft_trans_chain_policy(trans) = -1;
2234 if (nla[NFTA_CHAIN_HANDLE] &&
2235 nla[NFTA_CHAIN_NAME]) {
2236 struct nft_trans *tmp;
2240 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2245 list_for_each_entry(tmp, &ctx->net->nft.commit_list, list) {
2246 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2247 tmp->ctx.table == table &&
2248 nft_trans_chain_update(tmp) &&
2249 nft_trans_chain_name(tmp) &&
2250 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2251 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2257 nft_trans_chain_name(trans) = name;
2259 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
2268 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2269 const struct nlattr *nla)
2271 u32 id = ntohl(nla_get_be32(nla));
2272 struct nft_trans *trans;
2274 list_for_each_entry(trans, &net->nft.commit_list, list) {
2275 struct nft_chain *chain = trans->ctx.chain;
2277 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2278 id == nft_trans_chain_id(trans))
2281 return ERR_PTR(-ENOENT);
2284 static int nf_tables_newchain(struct net *net, struct sock *nlsk,
2285 struct sk_buff *skb, const struct nlmsghdr *nlh,
2286 const struct nlattr * const nla[],
2287 struct netlink_ext_ack *extack)
2289 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2290 u8 genmask = nft_genmask_next(net);
2291 int family = nfmsg->nfgen_family;
2292 struct nft_chain *chain = NULL;
2293 const struct nlattr *attr;
2294 struct nft_table *table;
2295 u8 policy = NF_ACCEPT;
2300 lockdep_assert_held(&net->nft.commit_mutex);
2302 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2303 if (IS_ERR(table)) {
2304 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2305 return PTR_ERR(table);
2309 attr = nla[NFTA_CHAIN_NAME];
2311 if (nla[NFTA_CHAIN_HANDLE]) {
2312 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2313 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2314 if (IS_ERR(chain)) {
2315 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2316 return PTR_ERR(chain);
2318 attr = nla[NFTA_CHAIN_HANDLE];
2319 } else if (nla[NFTA_CHAIN_NAME]) {
2320 chain = nft_chain_lookup(net, table, attr, genmask);
2321 if (IS_ERR(chain)) {
2322 if (PTR_ERR(chain) != -ENOENT) {
2323 NL_SET_BAD_ATTR(extack, attr);
2324 return PTR_ERR(chain);
2328 } else if (!nla[NFTA_CHAIN_ID]) {
2332 if (nla[NFTA_CHAIN_POLICY]) {
2333 if (chain != NULL &&
2334 !nft_is_base_chain(chain)) {
2335 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2339 if (chain == NULL &&
2340 nla[NFTA_CHAIN_HOOK] == NULL) {
2341 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2345 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2355 if (nla[NFTA_CHAIN_FLAGS])
2356 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2358 flags = chain->flags;
2360 if (flags & ~NFT_CHAIN_FLAGS)
2363 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2365 if (chain != NULL) {
2366 if (nlh->nlmsg_flags & NLM_F_EXCL) {
2367 NL_SET_BAD_ATTR(extack, attr);
2370 if (nlh->nlmsg_flags & NLM_F_REPLACE)
2373 flags |= chain->flags & NFT_CHAIN_BASE;
2374 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2378 return nf_tables_addchain(&ctx, family, genmask, policy, flags);
2381 static int nf_tables_delchain(struct net *net, struct sock *nlsk,
2382 struct sk_buff *skb, const struct nlmsghdr *nlh,
2383 const struct nlattr * const nla[],
2384 struct netlink_ext_ack *extack)
2386 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2387 u8 genmask = nft_genmask_next(net);
2388 int family = nfmsg->nfgen_family;
2389 const struct nlattr *attr;
2390 struct nft_table *table;
2391 struct nft_chain *chain;
2392 struct nft_rule *rule;
2398 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask);
2399 if (IS_ERR(table)) {
2400 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2401 return PTR_ERR(table);
2404 if (nla[NFTA_CHAIN_HANDLE]) {
2405 attr = nla[NFTA_CHAIN_HANDLE];
2406 handle = be64_to_cpu(nla_get_be64(attr));
2407 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2409 attr = nla[NFTA_CHAIN_NAME];
2410 chain = nft_chain_lookup(net, table, attr, genmask);
2412 if (IS_ERR(chain)) {
2413 NL_SET_BAD_ATTR(extack, attr);
2414 return PTR_ERR(chain);
2417 if (nlh->nlmsg_flags & NLM_F_NONREC &&
2421 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
2424 list_for_each_entry(rule, &chain->rules, list) {
2425 if (!nft_is_active_next(net, rule))
2429 err = nft_delrule(&ctx, rule);
2434 /* There are rules and elements that are still holding references to us,
2435 * we cannot do a recursive removal in this case.
2438 NL_SET_BAD_ATTR(extack, attr);
2442 return nft_delchain(&ctx);
2450 * nft_register_expr - register nf_tables expr type
2453 * Registers the expr type for use with nf_tables. Returns zero on
2454 * success or a negative errno code otherwise.
2456 int nft_register_expr(struct nft_expr_type *type)
2458 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2459 if (type->family == NFPROTO_UNSPEC)
2460 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2462 list_add_rcu(&type->list, &nf_tables_expressions);
2463 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2466 EXPORT_SYMBOL_GPL(nft_register_expr);
2469 * nft_unregister_expr - unregister nf_tables expr type
2472 * Unregisters the expr typefor use with nf_tables.
2474 void nft_unregister_expr(struct nft_expr_type *type)
2476 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2477 list_del_rcu(&type->list);
2478 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2480 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2482 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2485 const struct nft_expr_type *type, *candidate = NULL;
2487 list_for_each_entry(type, &nf_tables_expressions, list) {
2488 if (!nla_strcmp(nla, type->name)) {
2489 if (!type->family && !candidate)
2491 else if (type->family == family)
2498 #ifdef CONFIG_MODULES
2499 static int nft_expr_type_request_module(struct net *net, u8 family,
2502 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2503 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2510 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2514 const struct nft_expr_type *type;
2517 return ERR_PTR(-EINVAL);
2519 type = __nft_expr_type_get(family, nla);
2520 if (type != NULL && try_module_get(type->owner))
2523 lockdep_nfnl_nft_mutex_not_held();
2524 #ifdef CONFIG_MODULES
2526 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2527 return ERR_PTR(-EAGAIN);
2529 if (nft_request_module(net, "nft-expr-%.*s",
2531 (char *)nla_data(nla)) == -EAGAIN)
2532 return ERR_PTR(-EAGAIN);
2535 return ERR_PTR(-ENOENT);
2538 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2539 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2540 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2541 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2544 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2545 const struct nft_expr *expr)
2547 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2548 goto nla_put_failure;
2550 if (expr->ops->dump) {
2551 struct nlattr *data = nla_nest_start_noflag(skb,
2554 goto nla_put_failure;
2555 if (expr->ops->dump(skb, expr) < 0)
2556 goto nla_put_failure;
2557 nla_nest_end(skb, data);
2566 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2567 const struct nft_expr *expr)
2569 struct nlattr *nest;
2571 nest = nla_nest_start_noflag(skb, attr);
2573 goto nla_put_failure;
2574 if (nf_tables_fill_expr_info(skb, expr) < 0)
2575 goto nla_put_failure;
2576 nla_nest_end(skb, nest);
2583 struct nft_expr_info {
2584 const struct nft_expr_ops *ops;
2585 const struct nlattr *attr;
2586 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2589 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2590 const struct nlattr *nla,
2591 struct nft_expr_info *info)
2593 const struct nft_expr_type *type;
2594 const struct nft_expr_ops *ops;
2595 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2598 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2599 nft_expr_policy, NULL);
2603 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2605 return PTR_ERR(type);
2607 if (tb[NFTA_EXPR_DATA]) {
2608 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2610 type->policy, NULL);
2614 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2616 if (type->select_ops != NULL) {
2617 ops = type->select_ops(ctx,
2618 (const struct nlattr * const *)info->tb);
2621 #ifdef CONFIG_MODULES
2623 if (nft_expr_type_request_module(ctx->net,
2625 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2639 module_put(type->owner);
2643 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2644 const struct nft_expr_info *info,
2645 struct nft_expr *expr)
2647 const struct nft_expr_ops *ops = info->ops;
2652 err = ops->init(ctx, expr, (const struct nlattr **)info->tb);
2663 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2664 struct nft_expr *expr)
2666 const struct nft_expr_type *type = expr->ops->type;
2668 if (expr->ops->destroy)
2669 expr->ops->destroy(ctx, expr);
2670 module_put(type->owner);
2673 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2674 const struct nlattr *nla)
2676 struct nft_expr_info info;
2677 struct nft_expr *expr;
2678 struct module *owner;
2681 err = nf_tables_expr_parse(ctx, nla, &info);
2686 expr = kzalloc(info.ops->size, GFP_KERNEL);
2690 err = nf_tables_newexpr(ctx, &info, expr);
2698 owner = info.ops->type->owner;
2699 if (info.ops->type->release_ops)
2700 info.ops->type->release_ops(info.ops);
2704 return ERR_PTR(err);
2707 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2711 if (src->ops->clone) {
2712 dst->ops = src->ops;
2713 err = src->ops->clone(dst, src);
2717 memcpy(dst, src, src->ops->size);
2720 __module_get(src->ops->type->owner);
2725 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2727 nf_tables_expr_destroy(ctx, expr);
2735 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2738 struct nft_rule *rule;
2740 // FIXME: this sucks
2741 list_for_each_entry_rcu(rule, &chain->rules, list) {
2742 if (handle == rule->handle)
2746 return ERR_PTR(-ENOENT);
2749 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2750 const struct nlattr *nla)
2753 return ERR_PTR(-EINVAL);
2755 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2758 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2759 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2760 .len = NFT_TABLE_MAXNAMELEN - 1 },
2761 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2762 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2763 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2764 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2765 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2766 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2767 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2768 .len = NFT_USERDATA_MAXLEN },
2769 [NFTA_RULE_ID] = { .type = NLA_U32 },
2770 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2771 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2774 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2775 u32 portid, u32 seq, int event,
2776 u32 flags, int family,
2777 const struct nft_table *table,
2778 const struct nft_chain *chain,
2779 const struct nft_rule *rule,
2780 const struct nft_rule *prule)
2782 struct nlmsghdr *nlh;
2783 struct nfgenmsg *nfmsg;
2784 const struct nft_expr *expr, *next;
2785 struct nlattr *list;
2786 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2788 nlh = nlmsg_put(skb, portid, seq, type, sizeof(struct nfgenmsg), flags);
2790 goto nla_put_failure;
2792 nfmsg = nlmsg_data(nlh);
2793 nfmsg->nfgen_family = family;
2794 nfmsg->version = NFNETLINK_V0;
2795 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
2797 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2798 goto nla_put_failure;
2799 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2800 goto nla_put_failure;
2801 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2803 goto nla_put_failure;
2805 if (event != NFT_MSG_DELRULE && prule) {
2806 if (nla_put_be64(skb, NFTA_RULE_POSITION,
2807 cpu_to_be64(prule->handle),
2809 goto nla_put_failure;
2812 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2814 goto nla_put_failure;
2815 nft_rule_for_each_expr(expr, next, rule) {
2816 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2817 goto nla_put_failure;
2819 nla_nest_end(skb, list);
2822 struct nft_userdata *udata = nft_userdata(rule);
2823 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2825 goto nla_put_failure;
2828 nlmsg_end(skb, nlh);
2832 nlmsg_trim(skb, nlh);
2836 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2837 const struct nft_rule *rule, int event)
2839 struct sk_buff *skb;
2841 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
2842 ctx->table->name, ctx->table->handle,
2843 ctx->chain->name, ctx->chain->handle);
2845 audit_log_nfcfg(buf,
2848 event == NFT_MSG_NEWRULE ?
2849 AUDIT_NFT_OP_RULE_REGISTER :
2850 AUDIT_NFT_OP_RULE_UNREGISTER,
2855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2858 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2862 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2863 event, 0, ctx->family, ctx->table,
2864 ctx->chain, rule, NULL);
2870 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
2873 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2876 struct nft_rule_dump_ctx {
2881 static int __nf_tables_dump_rules(struct sk_buff *skb,
2883 struct netlink_callback *cb,
2884 const struct nft_table *table,
2885 const struct nft_chain *chain)
2887 struct net *net = sock_net(skb->sk);
2888 const struct nft_rule *rule, *prule;
2889 unsigned int s_idx = cb->args[0];
2892 list_for_each_entry_rcu(rule, &chain->rules, list) {
2893 if (!nft_is_active(net, rule))
2898 memset(&cb->args[1], 0,
2899 sizeof(cb->args) - sizeof(cb->args[0]));
2901 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
2904 NLM_F_MULTI | NLM_F_APPEND,
2906 table, chain, rule, prule) < 0)
2909 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2918 static int nf_tables_dump_rules(struct sk_buff *skb,
2919 struct netlink_callback *cb)
2921 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2922 const struct nft_rule_dump_ctx *ctx = cb->data;
2923 struct nft_table *table;
2924 const struct nft_chain *chain;
2925 unsigned int idx = 0;
2926 struct net *net = sock_net(skb->sk);
2927 int family = nfmsg->nfgen_family;
2930 cb->seq = net->nft.base_seq;
2932 list_for_each_entry_rcu(table, &net->nft.tables, list) {
2933 if (family != NFPROTO_UNSPEC && family != table->family)
2936 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
2939 if (ctx && ctx->table && ctx->chain) {
2940 struct rhlist_head *list, *tmp;
2942 list = rhltable_lookup(&table->chains_ht, ctx->chain,
2943 nft_chain_ht_params);
2947 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
2948 if (!nft_is_active(net, chain))
2950 __nf_tables_dump_rules(skb, &idx,
2957 list_for_each_entry_rcu(chain, &table->chains, list) {
2958 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
2962 if (ctx && ctx->table)
2972 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
2974 const struct nlattr * const *nla = cb->data;
2975 struct nft_rule_dump_ctx *ctx = NULL;
2977 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
2978 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
2982 if (nla[NFTA_RULE_TABLE]) {
2983 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
2990 if (nla[NFTA_RULE_CHAIN]) {
2991 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3005 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3007 struct nft_rule_dump_ctx *ctx = cb->data;
3017 /* called with rcu_read_lock held */
3018 static int nf_tables_getrule(struct net *net, struct sock *nlsk,
3019 struct sk_buff *skb, const struct nlmsghdr *nlh,
3020 const struct nlattr * const nla[],
3021 struct netlink_ext_ack *extack)
3023 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3024 u8 genmask = nft_genmask_cur(net);
3025 const struct nft_chain *chain;
3026 const struct nft_rule *rule;
3027 struct nft_table *table;
3028 struct sk_buff *skb2;
3029 int family = nfmsg->nfgen_family;
3032 if (nlh->nlmsg_flags & NLM_F_DUMP) {
3033 struct netlink_dump_control c = {
3034 .start= nf_tables_dump_rules_start,
3035 .dump = nf_tables_dump_rules,
3036 .done = nf_tables_dump_rules_done,
3037 .module = THIS_MODULE,
3038 .data = (void *)nla,
3041 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
3044 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3045 if (IS_ERR(table)) {
3046 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3047 return PTR_ERR(table);
3050 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3051 if (IS_ERR(chain)) {
3052 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3053 return PTR_ERR(chain);
3056 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3058 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3059 return PTR_ERR(rule);
3062 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3066 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3067 nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3068 family, table, chain, rule, NULL);
3070 goto err_fill_rule_info;
3072 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3079 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3080 struct nft_rule *rule)
3082 struct nft_expr *expr, *next;
3085 * Careful: some expressions might not be initialized in case this
3086 * is called on error from nf_tables_newrule().
3088 expr = nft_expr_first(rule);
3089 while (nft_expr_more(rule, expr)) {
3090 next = nft_expr_next(expr);
3091 nf_tables_expr_destroy(ctx, expr);
3097 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3099 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3100 nf_tables_rule_destroy(ctx, rule);
3103 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3105 struct nft_expr *expr, *last;
3106 const struct nft_data *data;
3107 struct nft_rule *rule;
3110 if (ctx->level == NFT_JUMP_STACK_SIZE)
3113 list_for_each_entry(rule, &chain->rules, list) {
3114 if (!nft_is_active_next(ctx->net, rule))
3117 nft_rule_for_each_expr(expr, last, rule) {
3118 if (!expr->ops->validate)
3121 err = expr->ops->validate(ctx, expr, &data);
3129 EXPORT_SYMBOL_GPL(nft_chain_validate);
3131 static int nft_table_validate(struct net *net, const struct nft_table *table)
3133 struct nft_chain *chain;
3134 struct nft_ctx ctx = {
3136 .family = table->family,
3140 list_for_each_entry(chain, &table->chains, list) {
3141 if (!nft_is_base_chain(chain))
3145 err = nft_chain_validate(&ctx, chain);
3153 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3154 const struct nlattr *nla);
3156 #define NFT_RULE_MAXEXPRS 128
3158 static int nf_tables_newrule(struct net *net, struct sock *nlsk,
3159 struct sk_buff *skb, const struct nlmsghdr *nlh,
3160 const struct nlattr * const nla[],
3161 struct netlink_ext_ack *extack)
3163 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3164 u8 genmask = nft_genmask_next(net);
3165 struct nft_expr_info *info = NULL;
3166 int family = nfmsg->nfgen_family;
3167 struct nft_flow_rule *flow;
3168 struct nft_table *table;
3169 struct nft_chain *chain;
3170 struct nft_rule *rule, *old_rule = NULL;
3171 struct nft_userdata *udata;
3172 struct nft_trans *trans = NULL;
3173 struct nft_expr *expr;
3176 unsigned int size, i, n, ulen = 0, usize = 0;
3178 u64 handle, pos_handle;
3180 lockdep_assert_held(&net->nft.commit_mutex);
3182 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3183 if (IS_ERR(table)) {
3184 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3185 return PTR_ERR(table);
3188 if (nla[NFTA_RULE_CHAIN]) {
3189 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3191 if (IS_ERR(chain)) {
3192 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3193 return PTR_ERR(chain);
3195 if (nft_chain_is_bound(chain))
3198 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3199 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3200 if (IS_ERR(chain)) {
3201 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3202 return PTR_ERR(chain);
3208 if (nla[NFTA_RULE_HANDLE]) {
3209 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3210 rule = __nft_rule_lookup(chain, handle);
3212 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3213 return PTR_ERR(rule);
3216 if (nlh->nlmsg_flags & NLM_F_EXCL) {
3217 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3220 if (nlh->nlmsg_flags & NLM_F_REPLACE)
3225 if (!(nlh->nlmsg_flags & NLM_F_CREATE) ||
3226 nlh->nlmsg_flags & NLM_F_REPLACE)
3228 handle = nf_tables_alloc_handle(table);
3230 if (chain->use == UINT_MAX)
3233 if (nla[NFTA_RULE_POSITION]) {
3234 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3235 old_rule = __nft_rule_lookup(chain, pos_handle);
3236 if (IS_ERR(old_rule)) {
3237 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3238 return PTR_ERR(old_rule);
3240 } else if (nla[NFTA_RULE_POSITION_ID]) {
3241 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3242 if (IS_ERR(old_rule)) {
3243 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3244 return PTR_ERR(old_rule);
3249 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3253 if (nla[NFTA_RULE_EXPRESSIONS]) {
3254 info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3255 sizeof(struct nft_expr_info),
3260 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3262 if (nla_type(tmp) != NFTA_LIST_ELEM)
3264 if (n == NFT_RULE_MAXEXPRS)
3266 err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
3269 size += info[n].ops->size;
3273 /* Check for overflow of dlen field */
3275 if (size >= 1 << 12)
3278 if (nla[NFTA_RULE_USERDATA]) {
3279 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3281 usize = sizeof(struct nft_userdata) + ulen;
3285 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3289 nft_activate_next(net, rule);
3291 rule->handle = handle;
3293 rule->udata = ulen ? 1 : 0;
3296 udata = nft_userdata(rule);
3297 udata->len = ulen - 1;
3298 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3301 expr = nft_expr_first(rule);
3302 for (i = 0; i < n; i++) {
3303 err = nf_tables_newexpr(&ctx, &info[i], expr);
3305 NL_SET_BAD_ATTR(extack, info[i].attr);
3309 if (info[i].ops->validate)
3310 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3313 expr = nft_expr_next(expr);
3316 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
3317 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3318 if (trans == NULL) {
3322 err = nft_delrule(&ctx, old_rule);
3324 nft_trans_destroy(trans);
3328 list_add_tail_rcu(&rule->list, &old_rule->list);
3330 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3336 if (nlh->nlmsg_flags & NLM_F_APPEND) {
3338 list_add_rcu(&rule->list, &old_rule->list);
3340 list_add_tail_rcu(&rule->list, &chain->rules);
3343 list_add_tail_rcu(&rule->list, &old_rule->list);
3345 list_add_rcu(&rule->list, &chain->rules);
3351 if (net->nft.validate_state == NFT_VALIDATE_DO)
3352 return nft_table_validate(net, table);
3354 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3355 flow = nft_flow_rule_create(net, rule);
3357 return PTR_ERR(flow);
3359 nft_trans_flow_rule(trans) = flow;
3364 nf_tables_rule_release(&ctx, rule);
3366 for (i = 0; i < n; i++) {
3368 module_put(info[i].ops->type->owner);
3369 if (info[i].ops->type->release_ops)
3370 info[i].ops->type->release_ops(info[i].ops);
3377 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3378 const struct nlattr *nla)
3380 u32 id = ntohl(nla_get_be32(nla));
3381 struct nft_trans *trans;
3383 list_for_each_entry(trans, &net->nft.commit_list, list) {
3384 struct nft_rule *rule = nft_trans_rule(trans);
3386 if (trans->msg_type == NFT_MSG_NEWRULE &&
3387 id == nft_trans_rule_id(trans))
3390 return ERR_PTR(-ENOENT);
3393 static int nf_tables_delrule(struct net *net, struct sock *nlsk,
3394 struct sk_buff *skb, const struct nlmsghdr *nlh,
3395 const struct nlattr * const nla[],
3396 struct netlink_ext_ack *extack)
3398 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3399 u8 genmask = nft_genmask_next(net);
3400 struct nft_table *table;
3401 struct nft_chain *chain = NULL;
3402 struct nft_rule *rule;
3403 int family = nfmsg->nfgen_family, err = 0;
3406 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask);
3407 if (IS_ERR(table)) {
3408 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3409 return PTR_ERR(table);
3412 if (nla[NFTA_RULE_CHAIN]) {
3413 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3415 if (IS_ERR(chain)) {
3416 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3417 return PTR_ERR(chain);
3419 if (nft_chain_is_bound(chain))
3423 nft_ctx_init(&ctx, net, skb, nlh, family, table, chain, nla);
3426 if (nla[NFTA_RULE_HANDLE]) {
3427 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3429 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3430 return PTR_ERR(rule);
3433 err = nft_delrule(&ctx, rule);
3434 } else if (nla[NFTA_RULE_ID]) {
3435 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3437 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3438 return PTR_ERR(rule);
3441 err = nft_delrule(&ctx, rule);
3443 err = nft_delrule_by_chain(&ctx);
3446 list_for_each_entry(chain, &table->chains, list) {
3447 if (!nft_is_active_next(net, chain))
3451 err = nft_delrule_by_chain(&ctx);
3463 static const struct nft_set_type *nft_set_types[] = {
3464 &nft_set_hash_fast_type,
3466 &nft_set_rhash_type,
3467 &nft_set_bitmap_type,
3468 &nft_set_rbtree_type,
3469 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3470 &nft_set_pipapo_avx2_type,
3472 &nft_set_pipapo_type,
3475 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3476 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3479 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3481 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3485 * Select a set implementation based on the data characteristics and the
3486 * given policy. The total memory use might not be known if no size is
3487 * given, in that case the amount of memory per element is used.
3489 static const struct nft_set_ops *
3490 nft_select_set_ops(const struct nft_ctx *ctx,
3491 const struct nlattr * const nla[],
3492 const struct nft_set_desc *desc,
3493 enum nft_set_policies policy)
3495 const struct nft_set_ops *ops, *bops;
3496 struct nft_set_estimate est, best;
3497 const struct nft_set_type *type;
3501 lockdep_assert_held(&ctx->net->nft.commit_mutex);
3502 lockdep_nfnl_nft_mutex_not_held();
3504 if (nla[NFTA_SET_FLAGS] != NULL)
3505 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3512 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3513 type = nft_set_types[i];
3516 if (!nft_set_ops_candidate(type, flags))
3518 if (!ops->estimate(desc, flags, &est))
3522 case NFT_SET_POL_PERFORMANCE:
3523 if (est.lookup < best.lookup)
3525 if (est.lookup == best.lookup &&
3526 est.space < best.space)
3529 case NFT_SET_POL_MEMORY:
3531 if (est.space < best.space)
3533 if (est.space == best.space &&
3534 est.lookup < best.lookup)
3536 } else if (est.size < best.size || !bops) {
3551 return ERR_PTR(-EOPNOTSUPP);
3554 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3555 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3556 .len = NFT_TABLE_MAXNAMELEN - 1 },
3557 [NFTA_SET_NAME] = { .type = NLA_STRING,
3558 .len = NFT_SET_MAXNAMELEN - 1 },
3559 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3560 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3561 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3562 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3563 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3564 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3565 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3566 [NFTA_SET_ID] = { .type = NLA_U32 },
3567 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3568 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3569 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3570 .len = NFT_USERDATA_MAXLEN },
3571 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3572 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3573 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3574 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3577 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3578 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3579 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3582 static int nft_ctx_init_from_setattr(struct nft_ctx *ctx, struct net *net,
3583 const struct sk_buff *skb,
3584 const struct nlmsghdr *nlh,
3585 const struct nlattr * const nla[],
3586 struct netlink_ext_ack *extack,
3589 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3590 int family = nfmsg->nfgen_family;
3591 struct nft_table *table = NULL;
3593 if (nla[NFTA_SET_TABLE] != NULL) {
3594 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
3596 if (IS_ERR(table)) {
3597 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
3598 return PTR_ERR(table);
3602 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
3606 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3607 const struct nlattr *nla, u8 genmask)
3609 struct nft_set *set;
3612 return ERR_PTR(-EINVAL);
3614 list_for_each_entry_rcu(set, &table->sets, list) {
3615 if (!nla_strcmp(nla, set->name) &&
3616 nft_active_genmask(set, genmask))
3619 return ERR_PTR(-ENOENT);
3622 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3623 const struct nlattr *nla,
3626 struct nft_set *set;
3628 list_for_each_entry(set, &table->sets, list) {
3629 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3630 nft_active_genmask(set, genmask))
3633 return ERR_PTR(-ENOENT);
3636 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3637 const struct nlattr *nla, u8 genmask)
3639 struct nft_trans *trans;
3640 u32 id = ntohl(nla_get_be32(nla));
3642 list_for_each_entry(trans, &net->nft.commit_list, list) {
3643 if (trans->msg_type == NFT_MSG_NEWSET) {
3644 struct nft_set *set = nft_trans_set(trans);
3646 if (id == nft_trans_set_id(trans) &&
3647 nft_active_genmask(set, genmask))
3651 return ERR_PTR(-ENOENT);
3654 struct nft_set *nft_set_lookup_global(const struct net *net,
3655 const struct nft_table *table,
3656 const struct nlattr *nla_set_name,
3657 const struct nlattr *nla_set_id,
3660 struct nft_set *set;
3662 set = nft_set_lookup(table, nla_set_name, genmask);
3667 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3671 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3673 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3676 const struct nft_set *i;
3678 unsigned long *inuse;
3679 unsigned int n = 0, min = 0;
3681 p = strchr(name, '%');
3683 if (p[1] != 'd' || strchr(p + 2, '%'))
3686 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3690 list_for_each_entry(i, &ctx->table->sets, list) {
3693 if (!nft_is_active_next(ctx->net, set))
3695 if (!sscanf(i->name, name, &tmp))
3697 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3700 set_bit(tmp - min, inuse);
3703 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3704 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3705 min += BITS_PER_BYTE * PAGE_SIZE;
3706 memset(inuse, 0, PAGE_SIZE);
3709 free_page((unsigned long)inuse);
3712 set->name = kasprintf(GFP_KERNEL, name, min + n);
3716 list_for_each_entry(i, &ctx->table->sets, list) {
3717 if (!nft_is_active_next(ctx->net, i))
3719 if (!strcmp(set->name, i->name)) {
3728 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3730 u64 ms = be64_to_cpu(nla_get_be64(nla));
3731 u64 max = (u64)(~((u64)0));
3733 max = div_u64(max, NSEC_PER_MSEC);
3737 ms *= NSEC_PER_MSEC;
3738 *result = nsecs_to_jiffies64(ms);
3742 __be64 nf_jiffies64_to_msecs(u64 input)
3744 return cpu_to_be64(jiffies64_to_msecs(input));
3747 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3748 const struct nft_set *set)
3750 struct nlattr *concat, *field;
3753 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3757 for (i = 0; i < set->field_count; i++) {
3758 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3762 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3763 htonl(set->field_len[i])))
3766 nla_nest_end(skb, field);
3769 nla_nest_end(skb, concat);
3774 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3775 const struct nft_set *set, u16 event, u16 flags)
3777 struct nfgenmsg *nfmsg;
3778 struct nlmsghdr *nlh;
3779 u32 portid = ctx->portid;
3780 struct nlattr *nest;
3784 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3785 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
3788 goto nla_put_failure;
3790 nfmsg = nlmsg_data(nlh);
3791 nfmsg->nfgen_family = ctx->family;
3792 nfmsg->version = NFNETLINK_V0;
3793 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
3795 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3796 goto nla_put_failure;
3797 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3798 goto nla_put_failure;
3799 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3801 goto nla_put_failure;
3802 if (set->flags != 0)
3803 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3804 goto nla_put_failure;
3806 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3807 goto nla_put_failure;
3808 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3809 goto nla_put_failure;
3810 if (set->flags & NFT_SET_MAP) {
3811 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3812 goto nla_put_failure;
3813 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3814 goto nla_put_failure;
3816 if (set->flags & NFT_SET_OBJECT &&
3817 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3818 goto nla_put_failure;
3821 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3822 nf_jiffies64_to_msecs(set->timeout),
3824 goto nla_put_failure;
3826 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3827 goto nla_put_failure;
3829 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3830 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3831 goto nla_put_failure;
3835 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3836 goto nla_put_failure;
3838 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3840 goto nla_put_failure;
3842 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3843 goto nla_put_failure;
3845 if (set->field_count > 1 &&
3846 nf_tables_fill_set_concat(skb, set))
3847 goto nla_put_failure;
3849 nla_nest_end(skb, nest);
3851 if (set->num_exprs == 1) {
3852 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3853 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3854 goto nla_put_failure;
3856 nla_nest_end(skb, nest);
3857 } else if (set->num_exprs > 1) {
3858 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3860 goto nla_put_failure;
3862 for (i = 0; i < set->num_exprs; i++) {
3863 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3865 goto nla_put_failure;
3867 nla_nest_end(skb, nest);
3870 nlmsg_end(skb, nlh);
3874 nlmsg_trim(skb, nlh);
3878 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3879 const struct nft_set *set, int event,
3882 struct sk_buff *skb;
3883 u32 portid = ctx->portid;
3885 char *buf = kasprintf(gfp_flags, "%s:%llu;%s:%llu",
3886 ctx->table->name, ctx->table->handle,
3887 set->name, set->handle);
3889 audit_log_nfcfg(buf,
3892 event == NFT_MSG_NEWSET ?
3893 AUDIT_NFT_OP_SET_REGISTER :
3894 AUDIT_NFT_OP_SET_UNREGISTER,
3899 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3902 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3906 err = nf_tables_fill_set(skb, ctx, set, event, 0);
3912 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
3915 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3918 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
3920 const struct nft_set *set;
3921 unsigned int idx, s_idx = cb->args[0];
3922 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
3923 struct net *net = sock_net(skb->sk);
3924 struct nft_ctx *ctx = cb->data, ctx_set;
3930 cb->seq = net->nft.base_seq;
3932 list_for_each_entry_rcu(table, &net->nft.tables, list) {
3933 if (ctx->family != NFPROTO_UNSPEC &&
3934 ctx->family != table->family)
3937 if (ctx->table && ctx->table != table)
3941 if (cur_table != table)
3947 list_for_each_entry_rcu(set, &table->sets, list) {
3950 if (!nft_is_active(net, set))
3954 ctx_set.table = table;
3955 ctx_set.family = table->family;
3957 if (nf_tables_fill_set(skb, &ctx_set, set,
3961 cb->args[2] = (unsigned long) table;
3964 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3977 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
3979 struct nft_ctx *ctx_dump = NULL;
3981 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
3982 if (ctx_dump == NULL)
3985 cb->data = ctx_dump;
3989 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
3995 /* called with rcu_read_lock held */
3996 static int nf_tables_getset(struct net *net, struct sock *nlsk,
3997 struct sk_buff *skb, const struct nlmsghdr *nlh,
3998 const struct nlattr * const nla[],
3999 struct netlink_ext_ack *extack)
4001 u8 genmask = nft_genmask_cur(net);
4002 const struct nft_set *set;
4004 struct sk_buff *skb2;
4005 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4008 /* Verify existence before starting dump */
4009 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4014 if (nlh->nlmsg_flags & NLM_F_DUMP) {
4015 struct netlink_dump_control c = {
4016 .start = nf_tables_dump_sets_start,
4017 .dump = nf_tables_dump_sets,
4018 .done = nf_tables_dump_sets_done,
4020 .module = THIS_MODULE,
4023 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
4026 /* Only accept unspec with dump */
4027 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4028 return -EAFNOSUPPORT;
4029 if (!nla[NFTA_SET_TABLE])
4032 set = nft_set_lookup(ctx.table, nla[NFTA_SET_NAME], genmask);
4034 return PTR_ERR(set);
4036 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4040 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4042 goto err_fill_set_info;
4044 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4051 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4052 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4055 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4056 struct nft_set_desc *desc)
4058 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4062 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4063 nft_concat_policy, NULL);
4067 if (!tb[NFTA_SET_FIELD_LEN])
4070 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4072 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4075 desc->field_len[desc->field_count++] = len;
4080 static int nft_set_desc_concat(struct nft_set_desc *desc,
4081 const struct nlattr *nla)
4083 struct nlattr *attr;
4086 nla_for_each_nested(attr, nla, rem) {
4087 if (nla_type(attr) != NFTA_LIST_ELEM)
4090 err = nft_set_desc_concat_parse(attr, desc);
4098 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4099 const struct nlattr *nla)
4101 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4104 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4105 nft_set_desc_policy, NULL);
4109 if (da[NFTA_SET_DESC_SIZE] != NULL)
4110 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4111 if (da[NFTA_SET_DESC_CONCAT])
4112 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4117 static int nf_tables_newset(struct net *net, struct sock *nlsk,
4118 struct sk_buff *skb, const struct nlmsghdr *nlh,
4119 const struct nlattr * const nla[],
4120 struct netlink_ext_ack *extack)
4122 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4123 u8 genmask = nft_genmask_next(net);
4124 int family = nfmsg->nfgen_family;
4125 const struct nft_set_ops *ops;
4126 struct nft_expr *expr = NULL;
4127 struct nft_table *table;
4128 struct nft_set *set;
4133 u32 ktype, dtype, flags, policy, gc_int, objtype;
4134 struct nft_set_desc desc;
4135 unsigned char *udata;
4140 if (nla[NFTA_SET_TABLE] == NULL ||
4141 nla[NFTA_SET_NAME] == NULL ||
4142 nla[NFTA_SET_KEY_LEN] == NULL ||
4143 nla[NFTA_SET_ID] == NULL)
4146 memset(&desc, 0, sizeof(desc));
4148 ktype = NFT_DATA_VALUE;
4149 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4150 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4151 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4155 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4156 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4160 if (nla[NFTA_SET_FLAGS] != NULL) {
4161 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4162 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4163 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4164 NFT_SET_MAP | NFT_SET_EVAL |
4165 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4167 /* Only one of these operations is supported */
4168 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4169 (NFT_SET_MAP | NFT_SET_OBJECT))
4171 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4172 (NFT_SET_EVAL | NFT_SET_OBJECT))
4177 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4178 if (!(flags & NFT_SET_MAP))
4181 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4182 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4183 dtype != NFT_DATA_VERDICT)
4186 if (dtype != NFT_DATA_VERDICT) {
4187 if (nla[NFTA_SET_DATA_LEN] == NULL)
4189 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4190 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4193 desc.dlen = sizeof(struct nft_verdict);
4194 } else if (flags & NFT_SET_MAP)
4197 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4198 if (!(flags & NFT_SET_OBJECT))
4201 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4202 if (objtype == NFT_OBJECT_UNSPEC ||
4203 objtype > NFT_OBJECT_MAX)
4205 } else if (flags & NFT_SET_OBJECT)
4208 objtype = NFT_OBJECT_UNSPEC;
4211 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4212 if (!(flags & NFT_SET_TIMEOUT))
4215 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4220 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4221 if (!(flags & NFT_SET_TIMEOUT))
4223 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4226 policy = NFT_SET_POL_PERFORMANCE;
4227 if (nla[NFTA_SET_POLICY] != NULL)
4228 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4230 if (nla[NFTA_SET_DESC] != NULL) {
4231 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4236 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4239 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask);
4240 if (IS_ERR(table)) {
4241 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4242 return PTR_ERR(table);
4245 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
4247 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4249 if (PTR_ERR(set) != -ENOENT) {
4250 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4251 return PTR_ERR(set);
4254 if (nlh->nlmsg_flags & NLM_F_EXCL) {
4255 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4258 if (nlh->nlmsg_flags & NLM_F_REPLACE)
4264 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
4267 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4269 return PTR_ERR(ops);
4272 if (nla[NFTA_SET_USERDATA])
4273 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4276 if (ops->privsize != NULL)
4277 size = ops->privsize(nla, &desc);
4279 set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL);
4283 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4289 err = nf_tables_set_alloc_name(&ctx, set, name);
4292 goto err_set_alloc_name;
4294 if (nla[NFTA_SET_EXPR]) {
4295 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4297 err = PTR_ERR(expr);
4298 goto err_set_alloc_name;
4300 set->exprs[0] = expr;
4302 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4303 struct nft_expr *expr;
4307 if (!(flags & NFT_SET_EXPR)) {
4309 goto err_set_alloc_name;
4312 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4313 if (i == NFT_SET_EXPR_MAX) {
4317 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4321 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4323 err = PTR_ERR(expr);
4326 set->exprs[i++] = expr;
4333 udata = set->data + size;
4334 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4337 INIT_LIST_HEAD(&set->bindings);
4339 write_pnet(&set->net, net);
4342 set->klen = desc.klen;
4344 set->objtype = objtype;
4345 set->dlen = desc.dlen;
4347 set->size = desc.size;
4348 set->policy = policy;
4351 set->timeout = timeout;
4352 set->gc_int = gc_int;
4353 set->handle = nf_tables_alloc_handle(table);
4355 set->field_count = desc.field_count;
4356 for (i = 0; i < desc.field_count; i++)
4357 set->field_len[i] = desc.field_len[i];
4359 err = ops->init(set, &desc, nla);
4363 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4367 list_add_tail_rcu(&set->list, &table->sets);
4374 for (i = 0; i < set->num_exprs; i++)
4375 nft_expr_destroy(&ctx, set->exprs[i]);
4383 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4387 if (WARN_ON(set->use > 0))
4390 for (i = 0; i < set->num_exprs; i++)
4391 nft_expr_destroy(ctx, set->exprs[i]);
4393 set->ops->destroy(set);
4398 static int nf_tables_delset(struct net *net, struct sock *nlsk,
4399 struct sk_buff *skb, const struct nlmsghdr *nlh,
4400 const struct nlattr * const nla[],
4401 struct netlink_ext_ack *extack)
4403 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4404 u8 genmask = nft_genmask_next(net);
4405 const struct nlattr *attr;
4406 struct nft_set *set;
4410 if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
4411 return -EAFNOSUPPORT;
4412 if (nla[NFTA_SET_TABLE] == NULL)
4415 err = nft_ctx_init_from_setattr(&ctx, net, skb, nlh, nla, extack,
4420 if (nla[NFTA_SET_HANDLE]) {
4421 attr = nla[NFTA_SET_HANDLE];
4422 set = nft_set_lookup_byhandle(ctx.table, attr, genmask);
4424 attr = nla[NFTA_SET_NAME];
4425 set = nft_set_lookup(ctx.table, attr, genmask);
4429 NL_SET_BAD_ATTR(extack, attr);
4430 return PTR_ERR(set);
4433 (nlh->nlmsg_flags & NLM_F_NONREC && atomic_read(&set->nelems) > 0)) {
4434 NL_SET_BAD_ATTR(extack, attr);
4438 return nft_delset(&ctx, set);
4441 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4442 struct nft_set *set,
4443 const struct nft_set_iter *iter,
4444 struct nft_set_elem *elem)
4446 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4447 enum nft_registers dreg;
4449 dreg = nft_type_to_reg(set->dtype);
4450 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4451 set->dtype == NFT_DATA_VERDICT ?
4452 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4456 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4457 struct nft_set_binding *binding)
4459 struct nft_set_binding *i;
4460 struct nft_set_iter iter;
4462 if (set->use == UINT_MAX)
4465 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4468 if (binding->flags & NFT_SET_MAP) {
4469 /* If the set is already bound to the same chain all
4470 * jumps are already validated for that chain.
4472 list_for_each_entry(i, &set->bindings, list) {
4473 if (i->flags & NFT_SET_MAP &&
4474 i->chain == binding->chain)
4478 iter.genmask = nft_genmask_next(ctx->net);
4482 iter.fn = nf_tables_bind_check_setelem;
4484 set->ops->walk(ctx, set, &iter);
4489 binding->chain = ctx->chain;
4490 list_add_tail_rcu(&binding->list, &set->bindings);
4491 nft_set_trans_bind(ctx, set);
4496 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4498 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4499 struct nft_set_binding *binding, bool event)
4501 list_del_rcu(&binding->list);
4503 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4504 list_del_rcu(&set->list);
4506 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4511 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4512 struct nft_set_binding *binding,
4513 enum nft_trans_phase phase)
4516 case NFT_TRANS_PREPARE:
4519 case NFT_TRANS_ABORT:
4520 case NFT_TRANS_RELEASE:
4524 nf_tables_unbind_set(ctx, set, binding,
4525 phase == NFT_TRANS_COMMIT);
4528 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4530 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4532 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4533 nft_set_destroy(ctx, set);
4535 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4537 const struct nft_set_ext_type nft_set_ext_types[] = {
4538 [NFT_SET_EXT_KEY] = {
4539 .align = __alignof__(u32),
4541 [NFT_SET_EXT_DATA] = {
4542 .align = __alignof__(u32),
4544 [NFT_SET_EXT_EXPRESSIONS] = {
4545 .align = __alignof__(struct nft_set_elem_expr),
4547 [NFT_SET_EXT_OBJREF] = {
4548 .len = sizeof(struct nft_object *),
4549 .align = __alignof__(struct nft_object *),
4551 [NFT_SET_EXT_FLAGS] = {
4553 .align = __alignof__(u8),
4555 [NFT_SET_EXT_TIMEOUT] = {
4557 .align = __alignof__(u64),
4559 [NFT_SET_EXT_EXPIRATION] = {
4561 .align = __alignof__(u64),
4563 [NFT_SET_EXT_USERDATA] = {
4564 .len = sizeof(struct nft_userdata),
4565 .align = __alignof__(struct nft_userdata),
4567 [NFT_SET_EXT_KEY_END] = {
4568 .align = __alignof__(u32),
4576 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4577 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4578 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4579 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4580 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4581 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4582 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4583 .len = NFT_USERDATA_MAXLEN },
4584 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4585 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4586 .len = NFT_OBJ_MAXNAMELEN - 1 },
4587 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4588 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4591 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4592 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4593 .len = NFT_TABLE_MAXNAMELEN - 1 },
4594 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4595 .len = NFT_SET_MAXNAMELEN - 1 },
4596 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4597 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4600 static int nft_ctx_init_from_elemattr(struct nft_ctx *ctx, struct net *net,
4601 const struct sk_buff *skb,
4602 const struct nlmsghdr *nlh,
4603 const struct nlattr * const nla[],
4604 struct netlink_ext_ack *extack,
4607 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
4608 int family = nfmsg->nfgen_family;
4609 struct nft_table *table;
4611 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
4613 if (IS_ERR(table)) {
4614 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
4615 return PTR_ERR(table);
4618 nft_ctx_init(ctx, net, skb, nlh, family, table, NULL, nla);
4622 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4623 const struct nft_set *set,
4624 const struct nft_set_ext *ext)
4626 struct nft_set_elem_expr *elem_expr;
4627 u32 size, num_exprs = 0;
4628 struct nft_expr *expr;
4629 struct nlattr *nest;
4631 elem_expr = nft_set_ext_expr(ext);
4632 nft_setelem_expr_foreach(expr, elem_expr, size)
4635 if (num_exprs == 1) {
4636 expr = nft_setelem_expr_at(elem_expr, 0);
4637 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4641 } else if (num_exprs > 1) {
4642 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4644 goto nla_put_failure;
4646 nft_setelem_expr_foreach(expr, elem_expr, size) {
4647 expr = nft_setelem_expr_at(elem_expr, size);
4648 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4649 goto nla_put_failure;
4651 nla_nest_end(skb, nest);
4659 static int nf_tables_fill_setelem(struct sk_buff *skb,
4660 const struct nft_set *set,
4661 const struct nft_set_elem *elem)
4663 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4664 unsigned char *b = skb_tail_pointer(skb);
4665 struct nlattr *nest;
4667 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4669 goto nla_put_failure;
4671 if (nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4672 NFT_DATA_VALUE, set->klen) < 0)
4673 goto nla_put_failure;
4675 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4676 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4677 NFT_DATA_VALUE, set->klen) < 0)
4678 goto nla_put_failure;
4680 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4681 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4682 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4684 goto nla_put_failure;
4686 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4687 nft_set_elem_expr_dump(skb, set, ext))
4688 goto nla_put_failure;
4690 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4691 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4692 (*nft_set_ext_obj(ext))->key.name) < 0)
4693 goto nla_put_failure;
4695 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4696 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4697 htonl(*nft_set_ext_flags(ext))))
4698 goto nla_put_failure;
4700 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4701 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4702 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4704 goto nla_put_failure;
4706 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4707 u64 expires, now = get_jiffies_64();
4709 expires = *nft_set_ext_expiration(ext);
4710 if (time_before64(now, expires))
4715 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4716 nf_jiffies64_to_msecs(expires),
4718 goto nla_put_failure;
4721 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4722 struct nft_userdata *udata;
4724 udata = nft_set_ext_userdata(ext);
4725 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4726 udata->len + 1, udata->data))
4727 goto nla_put_failure;
4730 nla_nest_end(skb, nest);
4738 struct nft_set_dump_args {
4739 const struct netlink_callback *cb;
4740 struct nft_set_iter iter;
4741 struct sk_buff *skb;
4744 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4745 struct nft_set *set,
4746 const struct nft_set_iter *iter,
4747 struct nft_set_elem *elem)
4749 struct nft_set_dump_args *args;
4751 args = container_of(iter, struct nft_set_dump_args, iter);
4752 return nf_tables_fill_setelem(args->skb, set, elem);
4755 struct nft_set_dump_ctx {
4756 const struct nft_set *set;
4760 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4762 struct nft_set_dump_ctx *dump_ctx = cb->data;
4763 struct net *net = sock_net(skb->sk);
4764 struct nft_table *table;
4765 struct nft_set *set;
4766 struct nft_set_dump_args args;
4767 bool set_found = false;
4768 struct nfgenmsg *nfmsg;
4769 struct nlmsghdr *nlh;
4770 struct nlattr *nest;
4775 list_for_each_entry_rcu(table, &net->nft.tables, list) {
4776 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4777 dump_ctx->ctx.family != table->family)
4780 if (table != dump_ctx->ctx.table)
4783 list_for_each_entry_rcu(set, &table->sets, list) {
4784 if (set == dump_ctx->set) {
4797 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4798 portid = NETLINK_CB(cb->skb).portid;
4799 seq = cb->nlh->nlmsg_seq;
4801 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4804 goto nla_put_failure;
4806 nfmsg = nlmsg_data(nlh);
4807 nfmsg->nfgen_family = table->family;
4808 nfmsg->version = NFNETLINK_V0;
4809 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
4811 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4812 goto nla_put_failure;
4813 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4814 goto nla_put_failure;
4816 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4818 goto nla_put_failure;
4822 args.iter.genmask = nft_genmask_cur(net);
4823 args.iter.skip = cb->args[0];
4824 args.iter.count = 0;
4826 args.iter.fn = nf_tables_dump_setelem;
4827 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4830 nla_nest_end(skb, nest);
4831 nlmsg_end(skb, nlh);
4833 if (args.iter.err && args.iter.err != -EMSGSIZE)
4834 return args.iter.err;
4835 if (args.iter.count == cb->args[0])
4838 cb->args[0] = args.iter.count;
4846 static int nf_tables_dump_set_start(struct netlink_callback *cb)
4848 struct nft_set_dump_ctx *dump_ctx = cb->data;
4850 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
4852 return cb->data ? 0 : -ENOMEM;
4855 static int nf_tables_dump_set_done(struct netlink_callback *cb)
4861 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
4862 const struct nft_ctx *ctx, u32 seq,
4863 u32 portid, int event, u16 flags,
4864 const struct nft_set *set,
4865 const struct nft_set_elem *elem)
4867 struct nfgenmsg *nfmsg;
4868 struct nlmsghdr *nlh;
4869 struct nlattr *nest;
4872 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4873 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
4876 goto nla_put_failure;
4878 nfmsg = nlmsg_data(nlh);
4879 nfmsg->nfgen_family = ctx->family;
4880 nfmsg->version = NFNETLINK_V0;
4881 nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
4883 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4884 goto nla_put_failure;
4885 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4886 goto nla_put_failure;
4888 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4890 goto nla_put_failure;
4892 err = nf_tables_fill_setelem(skb, set, elem);
4894 goto nla_put_failure;
4896 nla_nest_end(skb, nest);
4898 nlmsg_end(skb, nlh);
4902 nlmsg_trim(skb, nlh);
4906 static int nft_setelem_parse_flags(const struct nft_set *set,
4907 const struct nlattr *attr, u32 *flags)
4912 *flags = ntohl(nla_get_be32(attr));
4913 if (*flags & ~NFT_SET_ELEM_INTERVAL_END)
4915 if (!(set->flags & NFT_SET_INTERVAL) &&
4916 *flags & NFT_SET_ELEM_INTERVAL_END)
4922 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
4923 struct nft_data *key, struct nlattr *attr)
4925 struct nft_data_desc desc;
4928 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
4932 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
4933 nft_data_release(key, desc.type);
4940 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
4941 struct nft_data_desc *desc,
4942 struct nft_data *data,
4943 struct nlattr *attr)
4947 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
4951 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
4952 nft_data_release(data, desc->type);
4959 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
4960 const struct nlattr *attr)
4962 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
4963 struct nft_set_elem elem;
4964 struct sk_buff *skb;
4969 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
4970 nft_set_elem_policy, NULL);
4974 if (!nla[NFTA_SET_ELEM_KEY])
4977 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
4981 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
4982 nla[NFTA_SET_ELEM_KEY]);
4986 if (nla[NFTA_SET_ELEM_KEY_END]) {
4987 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
4988 nla[NFTA_SET_ELEM_KEY_END]);
4993 priv = set->ops->get(ctx->net, set, &elem, flags);
4995 return PTR_ERR(priv);
5000 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5004 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5005 NFT_MSG_NEWSETELEM, 0, set, &elem);
5007 goto err_fill_setelem;
5009 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5016 /* called with rcu_read_lock held */
5017 static int nf_tables_getsetelem(struct net *net, struct sock *nlsk,
5018 struct sk_buff *skb, const struct nlmsghdr *nlh,
5019 const struct nlattr * const nla[],
5020 struct netlink_ext_ack *extack)
5022 u8 genmask = nft_genmask_cur(net);
5023 struct nft_set *set;
5024 struct nlattr *attr;
5028 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5033 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5035 return PTR_ERR(set);
5037 if (nlh->nlmsg_flags & NLM_F_DUMP) {
5038 struct netlink_dump_control c = {
5039 .start = nf_tables_dump_set_start,
5040 .dump = nf_tables_dump_set,
5041 .done = nf_tables_dump_set_done,
5042 .module = THIS_MODULE,
5044 struct nft_set_dump_ctx dump_ctx = {
5050 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
5053 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5056 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5057 err = nft_get_set_elem(&ctx, set, attr);
5065 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5066 const struct nft_set *set,
5067 const struct nft_set_elem *elem,
5068 int event, u16 flags)
5070 struct net *net = ctx->net;
5071 u32 portid = ctx->portid;
5072 struct sk_buff *skb;
5074 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
5075 ctx->table->name, ctx->table->handle,
5076 set->name, set->handle);
5078 audit_log_nfcfg(buf,
5081 event == NFT_MSG_NEWSETELEM ?
5082 AUDIT_NFT_OP_SETELEM_REGISTER :
5083 AUDIT_NFT_OP_SETELEM_UNREGISTER,
5087 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5090 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5094 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5101 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
5104 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5107 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5109 struct nft_set *set)
5111 struct nft_trans *trans;
5113 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5117 nft_trans_elem_set(trans) = set;
5121 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5122 const struct nft_set *set,
5123 const struct nlattr *attr)
5125 struct nft_expr *expr;
5128 expr = nft_expr_init(ctx, attr);
5133 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5134 goto err_set_elem_expr;
5136 if (expr->ops->type->flags & NFT_EXPR_GC) {
5137 if (set->flags & NFT_SET_TIMEOUT)
5138 goto err_set_elem_expr;
5139 if (!set->ops->gc_init)
5140 goto err_set_elem_expr;
5141 set->ops->gc_init(set);
5147 nft_expr_destroy(ctx, expr);
5148 return ERR_PTR(err);
5151 void *nft_set_elem_init(const struct nft_set *set,
5152 const struct nft_set_ext_tmpl *tmpl,
5153 const u32 *key, const u32 *key_end,
5154 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5156 struct nft_set_ext *ext;
5159 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5163 ext = nft_set_elem_ext(set, elem);
5164 nft_set_ext_init(ext, tmpl);
5166 memcpy(nft_set_ext_key(ext), key, set->klen);
5167 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5168 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5169 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5170 memcpy(nft_set_ext_data(ext), data, set->dlen);
5171 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5172 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5173 if (expiration == 0)
5174 *nft_set_ext_expiration(ext) += timeout;
5176 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5177 *nft_set_ext_timeout(ext) = timeout;
5182 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5183 struct nft_expr *expr)
5185 if (expr->ops->destroy_clone) {
5186 expr->ops->destroy_clone(ctx, expr);
5187 module_put(expr->ops->type->owner);
5189 nf_tables_expr_destroy(ctx, expr);
5193 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5194 struct nft_set_elem_expr *elem_expr)
5196 struct nft_expr *expr;
5199 nft_setelem_expr_foreach(expr, elem_expr, size)
5200 __nft_set_elem_expr_destroy(ctx, expr);
5203 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5206 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5207 struct nft_ctx ctx = {
5208 .net = read_pnet(&set->net),
5209 .family = set->table->family,
5212 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5213 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5214 nft_data_release(nft_set_ext_data(ext), set->dtype);
5215 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5216 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5218 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5219 (*nft_set_ext_obj(ext))->use--;
5222 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5224 /* Only called from commit path, nft_set_elem_deactivate() already deals with
5225 * the refcounting from the preparation phase.
5227 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5228 const struct nft_set *set, void *elem)
5230 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5232 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5233 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5238 static int nft_set_elem_expr_clone(const struct nft_ctx *ctx,
5239 struct nft_set *set,
5240 struct nft_expr *expr_array[])
5242 struct nft_expr *expr;
5245 for (i = 0; i < set->num_exprs; i++) {
5246 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5250 err = nft_expr_clone(expr, set->exprs[i]);
5252 nft_expr_destroy(ctx, expr);
5255 expr_array[i] = expr;
5261 for (k = i - 1; k >= 0; k--)
5262 nft_expr_destroy(ctx, expr_array[k]);
5267 static void nft_set_elem_expr_setup(const struct nft_set_ext *ext, int i,
5268 struct nft_expr *expr_array[])
5270 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5271 struct nft_expr *expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5273 memcpy(expr, expr_array[i], expr_array[i]->ops->size);
5274 elem_expr->size += expr_array[i]->ops->size;
5275 kfree(expr_array[i]);
5276 expr_array[i] = NULL;
5279 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5280 const struct nlattr *attr, u32 nlmsg_flags)
5282 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5283 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5284 u8 genmask = nft_genmask_next(ctx->net);
5285 struct nft_set_ext_tmpl tmpl;
5286 struct nft_set_ext *ext, *ext2;
5287 struct nft_set_elem elem;
5288 struct nft_set_binding *binding;
5289 struct nft_object *obj = NULL;
5290 struct nft_userdata *udata;
5291 struct nft_data_desc desc;
5292 enum nft_registers dreg;
5293 struct nft_trans *trans;
5294 u32 flags = 0, size = 0;
5300 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5301 nft_set_elem_policy, NULL);
5305 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5308 nft_set_ext_prepare(&tmpl);
5310 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5314 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5316 if (set->flags & NFT_SET_MAP) {
5317 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5318 !(flags & NFT_SET_ELEM_INTERVAL_END))
5321 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5325 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5326 (nla[NFTA_SET_ELEM_DATA] ||
5327 nla[NFTA_SET_ELEM_OBJREF] ||
5328 nla[NFTA_SET_ELEM_TIMEOUT] ||
5329 nla[NFTA_SET_ELEM_EXPIRATION] ||
5330 nla[NFTA_SET_ELEM_USERDATA] ||
5331 nla[NFTA_SET_ELEM_EXPR] ||
5332 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5336 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5337 if (!(set->flags & NFT_SET_TIMEOUT))
5339 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5343 } else if (set->flags & NFT_SET_TIMEOUT) {
5344 timeout = set->timeout;
5348 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5349 if (!(set->flags & NFT_SET_TIMEOUT))
5351 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5357 if (nla[NFTA_SET_ELEM_EXPR]) {
5358 struct nft_expr *expr;
5360 if (set->num_exprs != 1)
5363 expr = nft_set_elem_expr_alloc(ctx, set,
5364 nla[NFTA_SET_ELEM_EXPR]);
5366 return PTR_ERR(expr);
5368 expr_array[0] = expr;
5370 if (set->exprs[0] && set->exprs[0]->ops != expr->ops) {
5372 goto err_set_elem_expr;
5374 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5375 struct nft_expr *expr;
5379 if (set->num_exprs == 0)
5383 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5384 if (i == set->num_exprs) {
5386 goto err_set_elem_expr;
5388 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5390 goto err_set_elem_expr;
5392 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5394 err = PTR_ERR(expr);
5395 goto err_set_elem_expr;
5397 expr_array[i] = expr;
5399 if (expr->ops != set->exprs[i]->ops) {
5401 goto err_set_elem_expr;
5405 if (set->num_exprs != i) {
5407 goto err_set_elem_expr;
5409 } else if (set->num_exprs > 0) {
5410 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5412 goto err_set_elem_expr_clone;
5415 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5416 nla[NFTA_SET_ELEM_KEY]);
5418 goto err_set_elem_expr;
5420 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5422 if (nla[NFTA_SET_ELEM_KEY_END]) {
5423 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5424 nla[NFTA_SET_ELEM_KEY_END]);
5428 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5432 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5433 if (timeout != set->timeout)
5434 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5437 if (set->num_exprs) {
5438 for (i = 0; i < set->num_exprs; i++)
5439 size += expr_array[i]->ops->size;
5441 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5442 sizeof(struct nft_set_elem_expr) +
5446 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5447 if (!(set->flags & NFT_SET_OBJECT)) {
5449 goto err_parse_key_end;
5451 obj = nft_obj_lookup(ctx->net, ctx->table,
5452 nla[NFTA_SET_ELEM_OBJREF],
5453 set->objtype, genmask);
5456 goto err_parse_key_end;
5458 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5461 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5462 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5463 nla[NFTA_SET_ELEM_DATA]);
5465 goto err_parse_key_end;
5467 dreg = nft_type_to_reg(set->dtype);
5468 list_for_each_entry(binding, &set->bindings, list) {
5469 struct nft_ctx bind_ctx = {
5471 .family = ctx->family,
5472 .table = ctx->table,
5473 .chain = (struct nft_chain *)binding->chain,
5476 if (!(binding->flags & NFT_SET_MAP))
5479 err = nft_validate_register_store(&bind_ctx, dreg,
5481 desc.type, desc.len);
5483 goto err_parse_data;
5485 if (desc.type == NFT_DATA_VERDICT &&
5486 (elem.data.val.verdict.code == NFT_GOTO ||
5487 elem.data.val.verdict.code == NFT_JUMP))
5488 nft_validate_state_update(ctx->net,
5492 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5495 /* The full maximum length of userdata can exceed the maximum
5496 * offset value (U8_MAX) for following extensions, therefor it
5497 * must be the last extension added.
5500 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5501 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5503 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5508 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5509 elem.key_end.val.data, elem.data.val.data,
5510 timeout, expiration, GFP_KERNEL);
5511 if (elem.priv == NULL)
5512 goto err_parse_data;
5514 ext = nft_set_elem_ext(set, elem.priv);
5516 *nft_set_ext_flags(ext) = flags;
5518 udata = nft_set_ext_userdata(ext);
5519 udata->len = ulen - 1;
5520 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5523 *nft_set_ext_obj(ext) = obj;
5526 for (i = 0; i < set->num_exprs; i++)
5527 nft_set_elem_expr_setup(ext, i, expr_array);
5529 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5533 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5534 err = set->ops->insert(ctx->net, set, &elem, &ext2);
5536 if (err == -EEXIST) {
5537 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5538 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5539 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5540 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5541 goto err_element_clash;
5542 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5543 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5544 memcmp(nft_set_ext_data(ext),
5545 nft_set_ext_data(ext2), set->dlen) != 0) ||
5546 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5547 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5548 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5549 goto err_element_clash;
5550 else if (!(nlmsg_flags & NLM_F_EXCL))
5552 } else if (err == -ENOTEMPTY) {
5553 /* ENOTEMPTY reports overlapping between this element
5554 * and an existing one.
5558 goto err_element_clash;
5562 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5567 nft_trans_elem(trans) = elem;
5568 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5572 set->ops->remove(ctx->net, set, &elem);
5579 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5581 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5582 nft_data_release(&elem.data.val, desc.type);
5584 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5586 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5588 for (i = 0; i < set->num_exprs && expr_array[i]; i++)
5589 nft_expr_destroy(ctx, expr_array[i]);
5590 err_set_elem_expr_clone:
5594 static int nf_tables_newsetelem(struct net *net, struct sock *nlsk,
5595 struct sk_buff *skb, const struct nlmsghdr *nlh,
5596 const struct nlattr * const nla[],
5597 struct netlink_ext_ack *extack)
5599 u8 genmask = nft_genmask_next(net);
5600 const struct nlattr *attr;
5601 struct nft_set *set;
5605 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
5608 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5613 set = nft_set_lookup_global(net, ctx.table, nla[NFTA_SET_ELEM_LIST_SET],
5614 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
5616 return PTR_ERR(set);
5618 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5621 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5622 err = nft_add_set_elem(&ctx, set, attr, nlh->nlmsg_flags);
5627 if (net->nft.validate_state == NFT_VALIDATE_DO)
5628 return nft_table_validate(net, ctx.table);
5634 * nft_data_hold - hold a nft_data item
5636 * @data: struct nft_data to release
5637 * @type: type of data
5639 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
5640 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
5641 * NFT_GOTO verdicts. This function must be called on active data objects
5642 * from the second phase of the commit protocol.
5644 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
5646 struct nft_chain *chain;
5647 struct nft_rule *rule;
5649 if (type == NFT_DATA_VERDICT) {
5650 switch (data->verdict.code) {
5653 chain = data->verdict.chain;
5656 if (!nft_chain_is_bound(chain))
5659 chain->table->use++;
5660 list_for_each_entry(rule, &chain->rules, list)
5663 nft_chain_add(chain->table, chain);
5669 static void nft_set_elem_activate(const struct net *net,
5670 const struct nft_set *set,
5671 struct nft_set_elem *elem)
5673 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5675 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5676 nft_data_hold(nft_set_ext_data(ext), set->dtype);
5677 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5678 (*nft_set_ext_obj(ext))->use++;
5681 static void nft_set_elem_deactivate(const struct net *net,
5682 const struct nft_set *set,
5683 struct nft_set_elem *elem)
5685 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5687 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5688 nft_data_release(nft_set_ext_data(ext), set->dtype);
5689 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5690 (*nft_set_ext_obj(ext))->use--;
5693 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
5694 const struct nlattr *attr)
5696 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5697 struct nft_set_ext_tmpl tmpl;
5698 struct nft_set_elem elem;
5699 struct nft_set_ext *ext;
5700 struct nft_trans *trans;
5705 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5706 nft_set_elem_policy, NULL);
5710 if (nla[NFTA_SET_ELEM_KEY] == NULL)
5713 nft_set_ext_prepare(&tmpl);
5715 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5719 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5721 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5722 nla[NFTA_SET_ELEM_KEY]);
5726 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5728 if (nla[NFTA_SET_ELEM_KEY_END]) {
5729 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5730 nla[NFTA_SET_ELEM_KEY_END]);
5734 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5738 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5739 elem.key_end.val.data, NULL, 0, 0,
5741 if (elem.priv == NULL)
5744 ext = nft_set_elem_ext(set, elem.priv);
5746 *nft_set_ext_flags(ext) = flags;
5748 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
5752 priv = set->ops->deactivate(ctx->net, set, &elem);
5760 nft_set_elem_deactivate(ctx->net, set, &elem);
5762 nft_trans_elem(trans) = elem;
5763 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5771 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5775 static int nft_flush_set(const struct nft_ctx *ctx,
5776 struct nft_set *set,
5777 const struct nft_set_iter *iter,
5778 struct nft_set_elem *elem)
5780 struct nft_trans *trans;
5783 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
5784 sizeof(struct nft_trans_elem), GFP_ATOMIC);
5788 if (!set->ops->flush(ctx->net, set, elem->priv)) {
5794 nft_set_elem_deactivate(ctx->net, set, elem);
5795 nft_trans_elem_set(trans) = set;
5796 nft_trans_elem(trans) = *elem;
5797 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
5805 static int nf_tables_delsetelem(struct net *net, struct sock *nlsk,
5806 struct sk_buff *skb, const struct nlmsghdr *nlh,
5807 const struct nlattr * const nla[],
5808 struct netlink_ext_ack *extack)
5810 u8 genmask = nft_genmask_next(net);
5811 const struct nlattr *attr;
5812 struct nft_set *set;
5816 err = nft_ctx_init_from_elemattr(&ctx, net, skb, nlh, nla, extack,
5821 set = nft_set_lookup(ctx.table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5823 return PTR_ERR(set);
5824 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
5827 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL) {
5828 struct nft_set_iter iter = {
5830 .fn = nft_flush_set,
5832 set->ops->walk(&ctx, set, &iter);
5837 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5838 err = nft_del_setelem(&ctx, set, attr);
5847 void nft_set_gc_batch_release(struct rcu_head *rcu)
5849 struct nft_set_gc_batch *gcb;
5852 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
5853 for (i = 0; i < gcb->head.cnt; i++)
5854 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
5858 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
5861 struct nft_set_gc_batch *gcb;
5863 gcb = kzalloc(sizeof(*gcb), gfp);
5866 gcb->head.set = set;
5875 * nft_register_obj- register nf_tables stateful object type
5876 * @obj_type: object type
5878 * Registers the object type for use with nf_tables. Returns zero on
5879 * success or a negative errno code otherwise.
5881 int nft_register_obj(struct nft_object_type *obj_type)
5883 if (obj_type->type == NFT_OBJECT_UNSPEC)
5886 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5887 list_add_rcu(&obj_type->list, &nf_tables_objects);
5888 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5891 EXPORT_SYMBOL_GPL(nft_register_obj);
5894 * nft_unregister_obj - unregister nf_tables object type
5895 * @obj_type: object type
5897 * Unregisters the object type for use with nf_tables.
5899 void nft_unregister_obj(struct nft_object_type *obj_type)
5901 nfnl_lock(NFNL_SUBSYS_NFTABLES);
5902 list_del_rcu(&obj_type->list);
5903 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
5905 EXPORT_SYMBOL_GPL(nft_unregister_obj);
5907 struct nft_object *nft_obj_lookup(const struct net *net,
5908 const struct nft_table *table,
5909 const struct nlattr *nla, u32 objtype,
5912 struct nft_object_hash_key k = { .table = table };
5913 char search[NFT_OBJ_MAXNAMELEN];
5914 struct rhlist_head *tmp, *list;
5915 struct nft_object *obj;
5917 nla_strscpy(search, nla, sizeof(search));
5920 WARN_ON_ONCE(!rcu_read_lock_held() &&
5921 !lockdep_commit_lock_is_held(net));
5924 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
5928 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
5929 if (objtype == obj->ops->type->type &&
5930 nft_active_genmask(obj, genmask)) {
5937 return ERR_PTR(-ENOENT);
5939 EXPORT_SYMBOL_GPL(nft_obj_lookup);
5941 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
5942 const struct nlattr *nla,
5943 u32 objtype, u8 genmask)
5945 struct nft_object *obj;
5947 list_for_each_entry(obj, &table->objects, list) {
5948 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
5949 objtype == obj->ops->type->type &&
5950 nft_active_genmask(obj, genmask))
5953 return ERR_PTR(-ENOENT);
5956 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
5957 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
5958 .len = NFT_TABLE_MAXNAMELEN - 1 },
5959 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
5960 .len = NFT_OBJ_MAXNAMELEN - 1 },
5961 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
5962 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
5963 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
5964 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
5965 .len = NFT_USERDATA_MAXLEN },
5968 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
5969 const struct nft_object_type *type,
5970 const struct nlattr *attr)
5973 const struct nft_object_ops *ops;
5974 struct nft_object *obj;
5977 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
5982 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
5983 type->policy, NULL);
5987 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
5990 if (type->select_ops) {
5991 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6001 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6005 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6018 return ERR_PTR(err);
6021 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6022 struct nft_object *obj, bool reset)
6024 struct nlattr *nest;
6026 nest = nla_nest_start_noflag(skb, attr);
6028 goto nla_put_failure;
6029 if (obj->ops->dump(skb, obj, reset) < 0)
6030 goto nla_put_failure;
6031 nla_nest_end(skb, nest);
6038 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6040 const struct nft_object_type *type;
6042 list_for_each_entry(type, &nf_tables_objects, list) {
6043 if (objtype == type->type)
6049 static const struct nft_object_type *
6050 nft_obj_type_get(struct net *net, u32 objtype)
6052 const struct nft_object_type *type;
6054 type = __nft_obj_type_get(objtype);
6055 if (type != NULL && try_module_get(type->owner))
6058 lockdep_nfnl_nft_mutex_not_held();
6059 #ifdef CONFIG_MODULES
6061 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6062 return ERR_PTR(-EAGAIN);
6065 return ERR_PTR(-ENOENT);
6068 static int nf_tables_updobj(const struct nft_ctx *ctx,
6069 const struct nft_object_type *type,
6070 const struct nlattr *attr,
6071 struct nft_object *obj)
6073 struct nft_object *newobj;
6074 struct nft_trans *trans;
6077 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6078 sizeof(struct nft_trans_obj));
6082 newobj = nft_obj_init(ctx, type, attr);
6083 if (IS_ERR(newobj)) {
6084 err = PTR_ERR(newobj);
6085 goto err_free_trans;
6088 nft_trans_obj(trans) = obj;
6089 nft_trans_obj_update(trans) = true;
6090 nft_trans_obj_newobj(trans) = newobj;
6091 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6100 static int nf_tables_newobj(struct net *net, struct sock *nlsk,
6101 struct sk_buff *skb, const struct nlmsghdr *nlh,
6102 const struct nlattr * const nla[],
6103 struct netlink_ext_ack *extack)
6105 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6106 const struct nft_object_type *type;
6107 u8 genmask = nft_genmask_next(net);
6108 int family = nfmsg->nfgen_family;
6109 struct nft_table *table;
6110 struct nft_object *obj;
6115 if (!nla[NFTA_OBJ_TYPE] ||
6116 !nla[NFTA_OBJ_NAME] ||
6117 !nla[NFTA_OBJ_DATA])
6120 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6121 if (IS_ERR(table)) {
6122 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6123 return PTR_ERR(table);
6126 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6127 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6130 if (err != -ENOENT) {
6131 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6135 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6136 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6139 if (nlh->nlmsg_flags & NLM_F_REPLACE)
6142 type = __nft_obj_type_get(objtype);
6143 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6145 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6148 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6150 type = nft_obj_type_get(net, objtype);
6152 return PTR_ERR(type);
6154 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6159 obj->key.table = table;
6160 obj->handle = nf_tables_alloc_handle(table);
6162 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6163 if (!obj->key.name) {
6168 if (nla[NFTA_OBJ_USERDATA]) {
6169 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6170 if (obj->udata == NULL)
6173 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6176 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6180 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6181 nft_objname_ht_params);
6185 list_add_tail_rcu(&obj->list, &table->objects);
6189 /* queued in transaction log */
6190 INIT_LIST_HEAD(&obj->list);
6193 kfree(obj->key.name);
6197 if (obj->ops->destroy)
6198 obj->ops->destroy(&ctx, obj);
6201 module_put(type->owner);
6205 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6206 u32 portid, u32 seq, int event, u32 flags,
6207 int family, const struct nft_table *table,
6208 struct nft_object *obj, bool reset)
6210 struct nfgenmsg *nfmsg;
6211 struct nlmsghdr *nlh;
6213 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6214 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
6216 goto nla_put_failure;
6218 nfmsg = nlmsg_data(nlh);
6219 nfmsg->nfgen_family = family;
6220 nfmsg->version = NFNETLINK_V0;
6221 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
6223 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6224 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6225 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6226 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6227 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6228 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6230 goto nla_put_failure;
6233 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6234 goto nla_put_failure;
6236 nlmsg_end(skb, nlh);
6240 nlmsg_trim(skb, nlh);
6244 struct nft_obj_filter {
6249 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6251 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6252 const struct nft_table *table;
6253 unsigned int idx = 0, s_idx = cb->args[0];
6254 struct nft_obj_filter *filter = cb->data;
6255 struct net *net = sock_net(skb->sk);
6256 int family = nfmsg->nfgen_family;
6257 struct nft_object *obj;
6260 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6264 cb->seq = net->nft.base_seq;
6266 list_for_each_entry_rcu(table, &net->nft.tables, list) {
6267 if (family != NFPROTO_UNSPEC && family != table->family)
6270 list_for_each_entry_rcu(obj, &table->objects, list) {
6271 if (!nft_is_active(net, obj))
6276 memset(&cb->args[1], 0,
6277 sizeof(cb->args) - sizeof(cb->args[0]));
6278 if (filter && filter->table &&
6279 strcmp(filter->table, table->name))
6282 filter->type != NFT_OBJECT_UNSPEC &&
6283 obj->ops->type->type != filter->type)
6287 char *buf = kasprintf(GFP_ATOMIC,
6292 audit_log_nfcfg(buf,
6295 AUDIT_NFT_OP_OBJ_RESET,
6300 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6303 NLM_F_MULTI | NLM_F_APPEND,
6304 table->family, table,
6308 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6320 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6322 const struct nlattr * const *nla = cb->data;
6323 struct nft_obj_filter *filter = NULL;
6325 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6326 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6330 if (nla[NFTA_OBJ_TABLE]) {
6331 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6332 if (!filter->table) {
6338 if (nla[NFTA_OBJ_TYPE])
6339 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6346 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6348 struct nft_obj_filter *filter = cb->data;
6351 kfree(filter->table);
6358 /* called with rcu_read_lock held */
6359 static int nf_tables_getobj(struct net *net, struct sock *nlsk,
6360 struct sk_buff *skb, const struct nlmsghdr *nlh,
6361 const struct nlattr * const nla[],
6362 struct netlink_ext_ack *extack)
6364 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6365 u8 genmask = nft_genmask_cur(net);
6366 int family = nfmsg->nfgen_family;
6367 const struct nft_table *table;
6368 struct nft_object *obj;
6369 struct sk_buff *skb2;
6374 if (nlh->nlmsg_flags & NLM_F_DUMP) {
6375 struct netlink_dump_control c = {
6376 .start = nf_tables_dump_obj_start,
6377 .dump = nf_tables_dump_obj,
6378 .done = nf_tables_dump_obj_done,
6379 .module = THIS_MODULE,
6380 .data = (void *)nla,
6383 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
6386 if (!nla[NFTA_OBJ_NAME] ||
6387 !nla[NFTA_OBJ_TYPE])
6390 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6391 if (IS_ERR(table)) {
6392 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6393 return PTR_ERR(table);
6396 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6397 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6399 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6400 return PTR_ERR(obj);
6403 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6407 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6411 char *buf = kasprintf(GFP_ATOMIC, "%s:%llu;?:0",
6412 table->name, table->handle);
6414 audit_log_nfcfg(buf,
6417 AUDIT_NFT_OP_OBJ_RESET,
6422 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6423 nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6424 family, table, obj, reset);
6426 goto err_fill_obj_info;
6428 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6435 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6437 if (obj->ops->destroy)
6438 obj->ops->destroy(ctx, obj);
6440 module_put(obj->ops->type->owner);
6441 kfree(obj->key.name);
6446 static int nf_tables_delobj(struct net *net, struct sock *nlsk,
6447 struct sk_buff *skb, const struct nlmsghdr *nlh,
6448 const struct nlattr * const nla[],
6449 struct netlink_ext_ack *extack)
6451 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6452 u8 genmask = nft_genmask_next(net);
6453 int family = nfmsg->nfgen_family;
6454 const struct nlattr *attr;
6455 struct nft_table *table;
6456 struct nft_object *obj;
6460 if (!nla[NFTA_OBJ_TYPE] ||
6461 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6464 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask);
6465 if (IS_ERR(table)) {
6466 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6467 return PTR_ERR(table);
6470 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6471 if (nla[NFTA_OBJ_HANDLE]) {
6472 attr = nla[NFTA_OBJ_HANDLE];
6473 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6475 attr = nla[NFTA_OBJ_NAME];
6476 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6480 NL_SET_BAD_ATTR(extack, attr);
6481 return PTR_ERR(obj);
6484 NL_SET_BAD_ATTR(extack, attr);
6488 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6490 return nft_delobj(&ctx, obj);
6493 void nft_obj_notify(struct net *net, const struct nft_table *table,
6494 struct nft_object *obj, u32 portid, u32 seq, int event,
6495 int family, int report, gfp_t gfp)
6497 struct sk_buff *skb;
6499 char *buf = kasprintf(gfp, "%s:%llu;?:0",
6500 table->name, table->handle);
6502 audit_log_nfcfg(buf,
6505 event == NFT_MSG_NEWOBJ ?
6506 AUDIT_NFT_OP_OBJ_REGISTER :
6507 AUDIT_NFT_OP_OBJ_UNREGISTER,
6512 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6515 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6519 err = nf_tables_fill_obj_info(skb, net, portid, seq, event, 0, family,
6526 nft_notify_enqueue(skb, report, &net->nft.notify_list);
6529 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6531 EXPORT_SYMBOL_GPL(nft_obj_notify);
6533 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6534 struct nft_object *obj, int event)
6536 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
6537 ctx->family, ctx->report, GFP_KERNEL);
6543 void nft_register_flowtable_type(struct nf_flowtable_type *type)
6545 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6546 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
6547 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6549 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
6551 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
6553 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6554 list_del_rcu(&type->list);
6555 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6557 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
6559 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
6560 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
6561 .len = NFT_NAME_MAXLEN - 1 },
6562 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
6563 .len = NFT_NAME_MAXLEN - 1 },
6564 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
6565 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
6566 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
6569 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
6570 const struct nlattr *nla, u8 genmask)
6572 struct nft_flowtable *flowtable;
6574 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
6575 if (!nla_strcmp(nla, flowtable->name) &&
6576 nft_active_genmask(flowtable, genmask))
6579 return ERR_PTR(-ENOENT);
6581 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
6583 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
6584 struct nft_flowtable *flowtable,
6585 enum nft_trans_phase phase)
6588 case NFT_TRANS_PREPARE:
6589 case NFT_TRANS_ABORT:
6590 case NFT_TRANS_RELEASE:
6597 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
6599 static struct nft_flowtable *
6600 nft_flowtable_lookup_byhandle(const struct nft_table *table,
6601 const struct nlattr *nla, u8 genmask)
6603 struct nft_flowtable *flowtable;
6605 list_for_each_entry(flowtable, &table->flowtables, list) {
6606 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
6607 nft_active_genmask(flowtable, genmask))
6610 return ERR_PTR(-ENOENT);
6613 struct nft_flowtable_hook {
6616 struct list_head list;
6619 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
6620 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
6621 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
6622 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
6625 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
6626 const struct nlattr *attr,
6627 struct nft_flowtable_hook *flowtable_hook,
6628 struct nft_flowtable *flowtable, bool add)
6630 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
6631 struct nft_hook *hook;
6632 int hooknum, priority;
6635 INIT_LIST_HEAD(&flowtable_hook->list);
6637 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
6638 nft_flowtable_hook_policy, NULL);
6643 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
6644 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
6647 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6648 if (hooknum != NF_NETDEV_INGRESS)
6651 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6653 flowtable_hook->priority = priority;
6654 flowtable_hook->num = hooknum;
6656 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
6657 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
6658 if (hooknum != flowtable->hooknum)
6662 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
6663 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
6664 if (priority != flowtable->data.priority)
6668 flowtable_hook->priority = flowtable->data.priority;
6669 flowtable_hook->num = flowtable->hooknum;
6672 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
6673 err = nf_tables_parse_netdev_hooks(ctx->net,
6674 tb[NFTA_FLOWTABLE_HOOK_DEVS],
6675 &flowtable_hook->list);
6680 list_for_each_entry(hook, &flowtable_hook->list, list) {
6681 hook->ops.pf = NFPROTO_NETDEV;
6682 hook->ops.hooknum = flowtable_hook->num;
6683 hook->ops.priority = flowtable_hook->priority;
6684 hook->ops.priv = &flowtable->data;
6685 hook->ops.hook = flowtable->data.type->hook;
6691 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
6693 const struct nf_flowtable_type *type;
6695 list_for_each_entry(type, &nf_tables_flowtables, list) {
6696 if (family == type->family)
6702 static const struct nf_flowtable_type *
6703 nft_flowtable_type_get(struct net *net, u8 family)
6705 const struct nf_flowtable_type *type;
6707 type = __nft_flowtable_type_get(family);
6708 if (type != NULL && try_module_get(type->owner))
6711 lockdep_nfnl_nft_mutex_not_held();
6712 #ifdef CONFIG_MODULES
6714 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
6715 return ERR_PTR(-EAGAIN);
6718 return ERR_PTR(-ENOENT);
6721 /* Only called from error and netdev event paths. */
6722 static void nft_unregister_flowtable_hook(struct net *net,
6723 struct nft_flowtable *flowtable,
6724 struct nft_hook *hook)
6726 nf_unregister_net_hook(net, &hook->ops);
6727 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
6731 static void nft_unregister_flowtable_net_hooks(struct net *net,
6732 struct list_head *hook_list)
6734 struct nft_hook *hook;
6736 list_for_each_entry(hook, hook_list, list)
6737 nf_unregister_net_hook(net, &hook->ops);
6740 static int nft_register_flowtable_net_hooks(struct net *net,
6741 struct nft_table *table,
6742 struct list_head *hook_list,
6743 struct nft_flowtable *flowtable)
6745 struct nft_hook *hook, *hook2, *next;
6746 struct nft_flowtable *ft;
6749 list_for_each_entry(hook, hook_list, list) {
6750 list_for_each_entry(ft, &table->flowtables, list) {
6751 list_for_each_entry(hook2, &ft->hook_list, list) {
6752 if (hook->ops.dev == hook2->ops.dev &&
6753 hook->ops.pf == hook2->ops.pf) {
6755 goto err_unregister_net_hooks;
6760 err = flowtable->data.type->setup(&flowtable->data,
6764 goto err_unregister_net_hooks;
6766 err = nf_register_net_hook(net, &hook->ops);
6768 flowtable->data.type->setup(&flowtable->data,
6771 goto err_unregister_net_hooks;
6779 err_unregister_net_hooks:
6780 list_for_each_entry_safe(hook, next, hook_list, list) {
6784 nft_unregister_flowtable_hook(net, flowtable, hook);
6785 list_del_rcu(&hook->list);
6786 kfree_rcu(hook, rcu);
6792 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
6794 struct nft_hook *hook, *next;
6796 list_for_each_entry_safe(hook, next, hook_list, list) {
6797 list_del_rcu(&hook->list);
6798 kfree_rcu(hook, rcu);
6802 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
6803 struct nft_flowtable *flowtable)
6805 const struct nlattr * const *nla = ctx->nla;
6806 struct nft_flowtable_hook flowtable_hook;
6807 struct nft_hook *hook, *next;
6808 struct nft_trans *trans;
6809 bool unregister = false;
6812 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
6813 &flowtable_hook, flowtable, false);
6817 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6818 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
6819 list_del(&hook->list);
6824 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
6825 &flowtable_hook.list, flowtable);
6827 goto err_flowtable_update_hook;
6829 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
6830 sizeof(struct nft_trans_flowtable));
6834 goto err_flowtable_update_hook;
6837 nft_trans_flowtable(trans) = flowtable;
6838 nft_trans_flowtable_update(trans) = true;
6839 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
6840 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
6842 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
6846 err_flowtable_update_hook:
6847 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
6849 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
6850 list_del_rcu(&hook->list);
6851 kfree_rcu(hook, rcu);
6858 static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
6859 struct sk_buff *skb,
6860 const struct nlmsghdr *nlh,
6861 const struct nlattr * const nla[],
6862 struct netlink_ext_ack *extack)
6864 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
6865 struct nft_flowtable_hook flowtable_hook;
6866 const struct nf_flowtable_type *type;
6867 u8 genmask = nft_genmask_next(net);
6868 int family = nfmsg->nfgen_family;
6869 struct nft_flowtable *flowtable;
6870 struct nft_hook *hook, *next;
6871 struct nft_table *table;
6875 if (!nla[NFTA_FLOWTABLE_TABLE] ||
6876 !nla[NFTA_FLOWTABLE_NAME] ||
6877 !nla[NFTA_FLOWTABLE_HOOK])
6880 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
6882 if (IS_ERR(table)) {
6883 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
6884 return PTR_ERR(table);
6887 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
6889 if (IS_ERR(flowtable)) {
6890 err = PTR_ERR(flowtable);
6891 if (err != -ENOENT) {
6892 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6896 if (nlh->nlmsg_flags & NLM_F_EXCL) {
6897 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
6901 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6903 return nft_flowtable_update(&ctx, nlh, flowtable);
6906 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
6908 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
6912 flowtable->table = table;
6913 flowtable->handle = nf_tables_alloc_handle(table);
6914 INIT_LIST_HEAD(&flowtable->hook_list);
6916 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
6917 if (!flowtable->name) {
6922 type = nft_flowtable_type_get(net, family);
6924 err = PTR_ERR(type);
6928 if (nla[NFTA_FLOWTABLE_FLAGS]) {
6929 flowtable->data.flags =
6930 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
6931 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK)
6935 write_pnet(&flowtable->data.net, net);
6936 flowtable->data.type = type;
6937 err = type->init(&flowtable->data);
6941 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
6942 &flowtable_hook, flowtable, true);
6946 list_splice(&flowtable_hook.list, &flowtable->hook_list);
6947 flowtable->data.priority = flowtable_hook.priority;
6948 flowtable->hooknum = flowtable_hook.num;
6950 err = nft_register_flowtable_net_hooks(ctx.net, table,
6951 &flowtable->hook_list,
6954 nft_flowtable_hooks_destroy(&flowtable->hook_list);
6958 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
6962 list_add_tail_rcu(&flowtable->list, &table->flowtables);
6967 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
6968 nft_unregister_flowtable_hook(net, flowtable, hook);
6969 list_del_rcu(&hook->list);
6970 kfree_rcu(hook, rcu);
6973 flowtable->data.type->free(&flowtable->data);
6975 module_put(type->owner);
6977 kfree(flowtable->name);
6983 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
6985 struct nft_hook *this, *next;
6987 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
6988 list_del(&this->list);
6993 static int nft_delflowtable_hook(struct nft_ctx *ctx,
6994 struct nft_flowtable *flowtable)
6996 const struct nlattr * const *nla = ctx->nla;
6997 struct nft_flowtable_hook flowtable_hook;
6998 struct nft_hook *this, *hook;
6999 struct nft_trans *trans;
7002 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7003 &flowtable_hook, flowtable, false);
7007 list_for_each_entry(this, &flowtable_hook.list, list) {
7008 hook = nft_hook_list_find(&flowtable->hook_list, this);
7011 goto err_flowtable_del_hook;
7013 hook->inactive = true;
7016 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7017 sizeof(struct nft_trans_flowtable));
7020 goto err_flowtable_del_hook;
7023 nft_trans_flowtable(trans) = flowtable;
7024 nft_trans_flowtable_update(trans) = true;
7025 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7026 nft_flowtable_hook_release(&flowtable_hook);
7028 list_add_tail(&trans->list, &ctx->net->nft.commit_list);
7032 err_flowtable_del_hook:
7033 list_for_each_entry(this, &flowtable_hook.list, list) {
7034 hook = nft_hook_list_find(&flowtable->hook_list, this);
7038 hook->inactive = false;
7040 nft_flowtable_hook_release(&flowtable_hook);
7045 static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
7046 struct sk_buff *skb,
7047 const struct nlmsghdr *nlh,
7048 const struct nlattr * const nla[],
7049 struct netlink_ext_ack *extack)
7051 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7052 u8 genmask = nft_genmask_next(net);
7053 int family = nfmsg->nfgen_family;
7054 struct nft_flowtable *flowtable;
7055 const struct nlattr *attr;
7056 struct nft_table *table;
7059 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7060 (!nla[NFTA_FLOWTABLE_NAME] &&
7061 !nla[NFTA_FLOWTABLE_HANDLE]))
7064 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7066 if (IS_ERR(table)) {
7067 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7068 return PTR_ERR(table);
7071 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7072 attr = nla[NFTA_FLOWTABLE_HANDLE];
7073 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7075 attr = nla[NFTA_FLOWTABLE_NAME];
7076 flowtable = nft_flowtable_lookup(table, attr, genmask);
7079 if (IS_ERR(flowtable)) {
7080 NL_SET_BAD_ATTR(extack, attr);
7081 return PTR_ERR(flowtable);
7084 nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
7086 if (nla[NFTA_FLOWTABLE_HOOK])
7087 return nft_delflowtable_hook(&ctx, flowtable);
7089 if (flowtable->use > 0) {
7090 NL_SET_BAD_ATTR(extack, attr);
7094 return nft_delflowtable(&ctx, flowtable);
7097 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7098 u32 portid, u32 seq, int event,
7099 u32 flags, int family,
7100 struct nft_flowtable *flowtable,
7101 struct list_head *hook_list)
7103 struct nlattr *nest, *nest_devs;
7104 struct nfgenmsg *nfmsg;
7105 struct nft_hook *hook;
7106 struct nlmsghdr *nlh;
7108 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7109 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), flags);
7111 goto nla_put_failure;
7113 nfmsg = nlmsg_data(nlh);
7114 nfmsg->nfgen_family = family;
7115 nfmsg->version = NFNETLINK_V0;
7116 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7118 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7119 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7120 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7121 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7122 NFTA_FLOWTABLE_PAD) ||
7123 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7124 goto nla_put_failure;
7126 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7128 goto nla_put_failure;
7129 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7130 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7131 goto nla_put_failure;
7133 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7135 goto nla_put_failure;
7137 list_for_each_entry_rcu(hook, hook_list, list) {
7138 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7139 goto nla_put_failure;
7141 nla_nest_end(skb, nest_devs);
7142 nla_nest_end(skb, nest);
7144 nlmsg_end(skb, nlh);
7148 nlmsg_trim(skb, nlh);
7152 struct nft_flowtable_filter {
7156 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7157 struct netlink_callback *cb)
7159 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7160 struct nft_flowtable_filter *filter = cb->data;
7161 unsigned int idx = 0, s_idx = cb->args[0];
7162 struct net *net = sock_net(skb->sk);
7163 int family = nfmsg->nfgen_family;
7164 struct nft_flowtable *flowtable;
7165 const struct nft_table *table;
7168 cb->seq = net->nft.base_seq;
7170 list_for_each_entry_rcu(table, &net->nft.tables, list) {
7171 if (family != NFPROTO_UNSPEC && family != table->family)
7174 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7175 if (!nft_is_active(net, flowtable))
7180 memset(&cb->args[1], 0,
7181 sizeof(cb->args) - sizeof(cb->args[0]));
7182 if (filter && filter->table &&
7183 strcmp(filter->table, table->name))
7186 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7188 NFT_MSG_NEWFLOWTABLE,
7189 NLM_F_MULTI | NLM_F_APPEND,
7192 &flowtable->hook_list) < 0)
7195 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7207 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7209 const struct nlattr * const *nla = cb->data;
7210 struct nft_flowtable_filter *filter = NULL;
7212 if (nla[NFTA_FLOWTABLE_TABLE]) {
7213 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7217 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7219 if (!filter->table) {
7229 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7231 struct nft_flowtable_filter *filter = cb->data;
7236 kfree(filter->table);
7242 /* called with rcu_read_lock held */
7243 static int nf_tables_getflowtable(struct net *net, struct sock *nlsk,
7244 struct sk_buff *skb,
7245 const struct nlmsghdr *nlh,
7246 const struct nlattr * const nla[],
7247 struct netlink_ext_ack *extack)
7249 const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
7250 u8 genmask = nft_genmask_cur(net);
7251 int family = nfmsg->nfgen_family;
7252 struct nft_flowtable *flowtable;
7253 const struct nft_table *table;
7254 struct sk_buff *skb2;
7257 if (nlh->nlmsg_flags & NLM_F_DUMP) {
7258 struct netlink_dump_control c = {
7259 .start = nf_tables_dump_flowtable_start,
7260 .dump = nf_tables_dump_flowtable,
7261 .done = nf_tables_dump_flowtable_done,
7262 .module = THIS_MODULE,
7263 .data = (void *)nla,
7266 return nft_netlink_dump_start_rcu(nlsk, skb, nlh, &c);
7269 if (!nla[NFTA_FLOWTABLE_NAME])
7272 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7275 return PTR_ERR(table);
7277 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7279 if (IS_ERR(flowtable))
7280 return PTR_ERR(flowtable);
7282 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7286 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7288 NFT_MSG_NEWFLOWTABLE, 0, family,
7289 flowtable, &flowtable->hook_list);
7291 goto err_fill_flowtable_info;
7293 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7295 err_fill_flowtable_info:
7300 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7301 struct nft_flowtable *flowtable,
7302 struct list_head *hook_list,
7305 struct sk_buff *skb;
7307 char *buf = kasprintf(GFP_KERNEL, "%s:%llu;%s:%llu",
7308 flowtable->table->name, flowtable->table->handle,
7309 flowtable->name, flowtable->handle);
7311 audit_log_nfcfg(buf,
7314 event == NFT_MSG_NEWFLOWTABLE ?
7315 AUDIT_NFT_OP_FLOWTABLE_REGISTER :
7316 AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
7321 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7324 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7328 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7330 ctx->family, flowtable, hook_list);
7336 nft_notify_enqueue(skb, ctx->report, &ctx->net->nft.notify_list);
7339 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7342 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7344 struct nft_hook *hook, *next;
7346 flowtable->data.type->free(&flowtable->data);
7347 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7348 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7350 list_del_rcu(&hook->list);
7353 kfree(flowtable->name);
7354 module_put(flowtable->data.type->owner);
7358 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7359 u32 portid, u32 seq)
7361 struct nlmsghdr *nlh;
7362 struct nfgenmsg *nfmsg;
7363 char buf[TASK_COMM_LEN];
7364 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7366 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg), 0);
7368 goto nla_put_failure;
7370 nfmsg = nlmsg_data(nlh);
7371 nfmsg->nfgen_family = AF_UNSPEC;
7372 nfmsg->version = NFNETLINK_V0;
7373 nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
7375 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
7376 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7377 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7378 goto nla_put_failure;
7380 nlmsg_end(skb, nlh);
7384 nlmsg_trim(skb, nlh);
7388 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7389 struct nft_flowtable *flowtable)
7391 struct nft_hook *hook;
7393 list_for_each_entry(hook, &flowtable->hook_list, list) {
7394 if (hook->ops.dev != dev)
7397 /* flow_offload_netdev_event() cleans up entries for us. */
7398 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7399 list_del_rcu(&hook->list);
7400 kfree_rcu(hook, rcu);
7405 static int nf_tables_flowtable_event(struct notifier_block *this,
7406 unsigned long event, void *ptr)
7408 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7409 struct nft_flowtable *flowtable;
7410 struct nft_table *table;
7413 if (event != NETDEV_UNREGISTER)
7417 mutex_lock(&net->nft.commit_mutex);
7418 list_for_each_entry(table, &net->nft.tables, list) {
7419 list_for_each_entry(flowtable, &table->flowtables, list) {
7420 nft_flowtable_event(event, dev, flowtable);
7423 mutex_unlock(&net->nft.commit_mutex);
7428 static struct notifier_block nf_tables_flowtable_notifier = {
7429 .notifier_call = nf_tables_flowtable_event,
7432 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7435 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7436 struct sk_buff *skb2;
7439 audit_log_nfcfg("?:0;?:0", 0, net->nft.base_seq,
7440 AUDIT_NFT_OP_GEN_REGISTER, GFP_KERNEL);
7442 if (!nlmsg_report(nlh) &&
7443 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7446 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7450 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7457 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7458 nlmsg_report(nlh), GFP_KERNEL);
7461 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7465 static int nf_tables_getgen(struct net *net, struct sock *nlsk,
7466 struct sk_buff *skb, const struct nlmsghdr *nlh,
7467 const struct nlattr * const nla[],
7468 struct netlink_ext_ack *extack)
7470 struct sk_buff *skb2;
7473 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7477 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7480 goto err_fill_gen_info;
7482 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7489 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7490 [NFT_MSG_NEWTABLE] = {
7491 .call_batch = nf_tables_newtable,
7492 .attr_count = NFTA_TABLE_MAX,
7493 .policy = nft_table_policy,
7495 [NFT_MSG_GETTABLE] = {
7496 .call_rcu = nf_tables_gettable,
7497 .attr_count = NFTA_TABLE_MAX,
7498 .policy = nft_table_policy,
7500 [NFT_MSG_DELTABLE] = {
7501 .call_batch = nf_tables_deltable,
7502 .attr_count = NFTA_TABLE_MAX,
7503 .policy = nft_table_policy,
7505 [NFT_MSG_NEWCHAIN] = {
7506 .call_batch = nf_tables_newchain,
7507 .attr_count = NFTA_CHAIN_MAX,
7508 .policy = nft_chain_policy,
7510 [NFT_MSG_GETCHAIN] = {
7511 .call_rcu = nf_tables_getchain,
7512 .attr_count = NFTA_CHAIN_MAX,
7513 .policy = nft_chain_policy,
7515 [NFT_MSG_DELCHAIN] = {
7516 .call_batch = nf_tables_delchain,
7517 .attr_count = NFTA_CHAIN_MAX,
7518 .policy = nft_chain_policy,
7520 [NFT_MSG_NEWRULE] = {
7521 .call_batch = nf_tables_newrule,
7522 .attr_count = NFTA_RULE_MAX,
7523 .policy = nft_rule_policy,
7525 [NFT_MSG_GETRULE] = {
7526 .call_rcu = nf_tables_getrule,
7527 .attr_count = NFTA_RULE_MAX,
7528 .policy = nft_rule_policy,
7530 [NFT_MSG_DELRULE] = {
7531 .call_batch = nf_tables_delrule,
7532 .attr_count = NFTA_RULE_MAX,
7533 .policy = nft_rule_policy,
7535 [NFT_MSG_NEWSET] = {
7536 .call_batch = nf_tables_newset,
7537 .attr_count = NFTA_SET_MAX,
7538 .policy = nft_set_policy,
7540 [NFT_MSG_GETSET] = {
7541 .call_rcu = nf_tables_getset,
7542 .attr_count = NFTA_SET_MAX,
7543 .policy = nft_set_policy,
7545 [NFT_MSG_DELSET] = {
7546 .call_batch = nf_tables_delset,
7547 .attr_count = NFTA_SET_MAX,
7548 .policy = nft_set_policy,
7550 [NFT_MSG_NEWSETELEM] = {
7551 .call_batch = nf_tables_newsetelem,
7552 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7553 .policy = nft_set_elem_list_policy,
7555 [NFT_MSG_GETSETELEM] = {
7556 .call_rcu = nf_tables_getsetelem,
7557 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7558 .policy = nft_set_elem_list_policy,
7560 [NFT_MSG_DELSETELEM] = {
7561 .call_batch = nf_tables_delsetelem,
7562 .attr_count = NFTA_SET_ELEM_LIST_MAX,
7563 .policy = nft_set_elem_list_policy,
7565 [NFT_MSG_GETGEN] = {
7566 .call_rcu = nf_tables_getgen,
7568 [NFT_MSG_NEWOBJ] = {
7569 .call_batch = nf_tables_newobj,
7570 .attr_count = NFTA_OBJ_MAX,
7571 .policy = nft_obj_policy,
7573 [NFT_MSG_GETOBJ] = {
7574 .call_rcu = nf_tables_getobj,
7575 .attr_count = NFTA_OBJ_MAX,
7576 .policy = nft_obj_policy,
7578 [NFT_MSG_DELOBJ] = {
7579 .call_batch = nf_tables_delobj,
7580 .attr_count = NFTA_OBJ_MAX,
7581 .policy = nft_obj_policy,
7583 [NFT_MSG_GETOBJ_RESET] = {
7584 .call_rcu = nf_tables_getobj,
7585 .attr_count = NFTA_OBJ_MAX,
7586 .policy = nft_obj_policy,
7588 [NFT_MSG_NEWFLOWTABLE] = {
7589 .call_batch = nf_tables_newflowtable,
7590 .attr_count = NFTA_FLOWTABLE_MAX,
7591 .policy = nft_flowtable_policy,
7593 [NFT_MSG_GETFLOWTABLE] = {
7594 .call_rcu = nf_tables_getflowtable,
7595 .attr_count = NFTA_FLOWTABLE_MAX,
7596 .policy = nft_flowtable_policy,
7598 [NFT_MSG_DELFLOWTABLE] = {
7599 .call_batch = nf_tables_delflowtable,
7600 .attr_count = NFTA_FLOWTABLE_MAX,
7601 .policy = nft_flowtable_policy,
7605 static int nf_tables_validate(struct net *net)
7607 struct nft_table *table;
7609 switch (net->nft.validate_state) {
7610 case NFT_VALIDATE_SKIP:
7612 case NFT_VALIDATE_NEED:
7613 nft_validate_state_update(net, NFT_VALIDATE_DO);
7615 case NFT_VALIDATE_DO:
7616 list_for_each_entry(table, &net->nft.tables, list) {
7617 if (nft_table_validate(net, table) < 0)
7626 /* a drop policy has to be deferred until all rules have been activated,
7627 * otherwise a large ruleset that contains a drop-policy base chain will
7628 * cause all packets to get dropped until the full transaction has been
7631 * We defer the drop policy until the transaction has been finalized.
7633 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
7635 struct nft_base_chain *basechain;
7637 if (nft_trans_chain_policy(trans) != NF_DROP)
7640 if (!nft_is_base_chain(trans->ctx.chain))
7643 basechain = nft_base_chain(trans->ctx.chain);
7644 basechain->policy = NF_DROP;
7647 static void nft_chain_commit_update(struct nft_trans *trans)
7649 struct nft_base_chain *basechain;
7651 if (nft_trans_chain_name(trans)) {
7652 rhltable_remove(&trans->ctx.table->chains_ht,
7653 &trans->ctx.chain->rhlhead,
7654 nft_chain_ht_params);
7655 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
7656 rhltable_insert_key(&trans->ctx.table->chains_ht,
7657 trans->ctx.chain->name,
7658 &trans->ctx.chain->rhlhead,
7659 nft_chain_ht_params);
7662 if (!nft_is_base_chain(trans->ctx.chain))
7665 nft_chain_stats_replace(trans);
7667 basechain = nft_base_chain(trans->ctx.chain);
7669 switch (nft_trans_chain_policy(trans)) {
7672 basechain->policy = nft_trans_chain_policy(trans);
7677 static void nft_obj_commit_update(struct nft_trans *trans)
7679 struct nft_object *newobj;
7680 struct nft_object *obj;
7682 obj = nft_trans_obj(trans);
7683 newobj = nft_trans_obj_newobj(trans);
7685 if (obj->ops->update)
7686 obj->ops->update(obj, newobj);
7691 static void nft_commit_release(struct nft_trans *trans)
7693 switch (trans->msg_type) {
7694 case NFT_MSG_DELTABLE:
7695 nf_tables_table_destroy(&trans->ctx);
7697 case NFT_MSG_NEWCHAIN:
7698 free_percpu(nft_trans_chain_stats(trans));
7699 kfree(nft_trans_chain_name(trans));
7701 case NFT_MSG_DELCHAIN:
7702 nf_tables_chain_destroy(&trans->ctx);
7704 case NFT_MSG_DELRULE:
7705 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
7707 case NFT_MSG_DELSET:
7708 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
7710 case NFT_MSG_DELSETELEM:
7711 nf_tables_set_elem_destroy(&trans->ctx,
7712 nft_trans_elem_set(trans),
7713 nft_trans_elem(trans).priv);
7715 case NFT_MSG_DELOBJ:
7716 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
7718 case NFT_MSG_DELFLOWTABLE:
7719 if (nft_trans_flowtable_update(trans))
7720 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
7722 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
7727 put_net(trans->ctx.net);
7732 static void nf_tables_trans_destroy_work(struct work_struct *w)
7734 struct nft_trans *trans, *next;
7737 spin_lock(&nf_tables_destroy_list_lock);
7738 list_splice_init(&nf_tables_destroy_list, &head);
7739 spin_unlock(&nf_tables_destroy_list_lock);
7741 if (list_empty(&head))
7746 list_for_each_entry_safe(trans, next, &head, list) {
7747 list_del(&trans->list);
7748 nft_commit_release(trans);
7752 void nf_tables_trans_destroy_flush_work(void)
7754 flush_work(&trans_destroy_work);
7756 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
7758 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
7760 struct nft_rule *rule;
7761 unsigned int alloc = 0;
7764 /* already handled or inactive chain? */
7765 if (chain->rules_next || !nft_is_active_next(net, chain))
7768 rule = list_entry(&chain->rules, struct nft_rule, list);
7771 list_for_each_entry_continue(rule, &chain->rules, list) {
7772 if (nft_is_active_next(net, rule))
7776 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
7777 if (!chain->rules_next)
7780 list_for_each_entry_continue(rule, &chain->rules, list) {
7781 if (nft_is_active_next(net, rule))
7782 chain->rules_next[i++] = rule;
7785 chain->rules_next[i] = NULL;
7789 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
7791 struct nft_trans *trans, *next;
7793 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
7794 struct nft_chain *chain = trans->ctx.chain;
7796 if (trans->msg_type == NFT_MSG_NEWRULE ||
7797 trans->msg_type == NFT_MSG_DELRULE) {
7798 kvfree(chain->rules_next);
7799 chain->rules_next = NULL;
7804 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
7806 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
7811 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
7813 struct nft_rule **r = rules;
7814 struct nft_rules_old *old;
7819 r++; /* rcu_head is after end marker */
7823 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
7826 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
7828 struct nft_rule **g0, **g1;
7831 next_genbit = nft_gencursor_next(net);
7833 g0 = rcu_dereference_protected(chain->rules_gen_0,
7834 lockdep_commit_lock_is_held(net));
7835 g1 = rcu_dereference_protected(chain->rules_gen_1,
7836 lockdep_commit_lock_is_held(net));
7838 /* No changes to this chain? */
7839 if (chain->rules_next == NULL) {
7840 /* chain had no change in last or next generation */
7844 * chain had no change in this generation; make sure next
7845 * one uses same rules as current generation.
7848 rcu_assign_pointer(chain->rules_gen_1, g0);
7849 nf_tables_commit_chain_free_rules_old(g1);
7851 rcu_assign_pointer(chain->rules_gen_0, g1);
7852 nf_tables_commit_chain_free_rules_old(g0);
7859 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
7861 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
7863 chain->rules_next = NULL;
7869 nf_tables_commit_chain_free_rules_old(g1);
7871 nf_tables_commit_chain_free_rules_old(g0);
7874 static void nft_obj_del(struct nft_object *obj)
7876 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
7877 list_del_rcu(&obj->list);
7880 void nft_chain_del(struct nft_chain *chain)
7882 struct nft_table *table = chain->table;
7884 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
7885 nft_chain_ht_params));
7886 list_del_rcu(&chain->list);
7889 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
7890 struct list_head *hook_list)
7892 struct nft_hook *hook, *next;
7894 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7896 list_move(&hook->list, hook_list);
7900 static void nf_tables_module_autoload_cleanup(struct net *net)
7902 struct nft_module_request *req, *next;
7904 WARN_ON_ONCE(!list_empty(&net->nft.commit_list));
7905 list_for_each_entry_safe(req, next, &net->nft.module_list, list) {
7906 WARN_ON_ONCE(!req->done);
7907 list_del(&req->list);
7912 static void nf_tables_commit_release(struct net *net)
7914 struct nft_trans *trans;
7916 /* all side effects have to be made visible.
7917 * For example, if a chain named 'foo' has been deleted, a
7918 * new transaction must not find it anymore.
7920 * Memory reclaim happens asynchronously from work queue
7921 * to prevent expensive synchronize_rcu() in commit phase.
7923 if (list_empty(&net->nft.commit_list)) {
7924 nf_tables_module_autoload_cleanup(net);
7925 mutex_unlock(&net->nft.commit_mutex);
7929 trans = list_last_entry(&net->nft.commit_list,
7930 struct nft_trans, list);
7931 get_net(trans->ctx.net);
7932 WARN_ON_ONCE(trans->put_net);
7934 trans->put_net = true;
7935 spin_lock(&nf_tables_destroy_list_lock);
7936 list_splice_tail_init(&net->nft.commit_list, &nf_tables_destroy_list);
7937 spin_unlock(&nf_tables_destroy_list_lock);
7939 nf_tables_module_autoload_cleanup(net);
7940 schedule_work(&trans_destroy_work);
7942 mutex_unlock(&net->nft.commit_mutex);
7945 static void nft_commit_notify(struct net *net, u32 portid)
7947 struct sk_buff *batch_skb = NULL, *nskb, *skb;
7948 unsigned char *data;
7951 list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) {
7955 len = NLMSG_GOODSIZE - skb->len;
7956 list_del(&skb->list);
7960 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
7961 data = skb_put(batch_skb, skb->len);
7962 memcpy(data, skb->data, skb->len);
7963 list_del(&skb->list);
7967 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7968 NFT_CB(batch_skb).report, GFP_KERNEL);
7973 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
7974 NFT_CB(batch_skb).report, GFP_KERNEL);
7977 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
7980 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
7982 struct nft_trans *trans, *next;
7983 struct nft_trans_elem *te;
7984 struct nft_chain *chain;
7985 struct nft_table *table;
7988 if (list_empty(&net->nft.commit_list)) {
7989 mutex_unlock(&net->nft.commit_mutex);
7993 /* 0. Validate ruleset, otherwise roll back for error reporting. */
7994 if (nf_tables_validate(net) < 0)
7997 err = nft_flow_rule_offload_commit(net);
8001 /* 1. Allocate space for next generation rules_gen_X[] */
8002 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8005 if (trans->msg_type == NFT_MSG_NEWRULE ||
8006 trans->msg_type == NFT_MSG_DELRULE) {
8007 chain = trans->ctx.chain;
8009 ret = nf_tables_commit_chain_prepare(net, chain);
8011 nf_tables_commit_chain_prepare_cancel(net);
8017 /* step 2. Make rules_gen_X visible to packet path */
8018 list_for_each_entry(table, &net->nft.tables, list) {
8019 list_for_each_entry(chain, &table->chains, list)
8020 nf_tables_commit_chain(net, chain);
8024 * Bump generation counter, invalidate any dump in progress.
8025 * Cannot fail after this point.
8027 while (++net->nft.base_seq == 0);
8029 /* step 3. Start new generation, rules_gen_X now in use. */
8030 net->nft.gencursor = nft_gencursor_next(net);
8032 list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
8033 switch (trans->msg_type) {
8034 case NFT_MSG_NEWTABLE:
8035 if (nft_trans_table_update(trans)) {
8036 if (!nft_trans_table_enable(trans)) {
8037 nf_tables_table_disable(net,
8039 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8042 nft_clear(net, trans->ctx.table);
8044 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8045 nft_trans_destroy(trans);
8047 case NFT_MSG_DELTABLE:
8048 list_del_rcu(&trans->ctx.table->list);
8049 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8051 case NFT_MSG_NEWCHAIN:
8052 if (nft_trans_chain_update(trans)) {
8053 nft_chain_commit_update(trans);
8054 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8055 /* trans destroyed after rcu grace period */
8057 nft_chain_commit_drop_policy(trans);
8058 nft_clear(net, trans->ctx.chain);
8059 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8060 nft_trans_destroy(trans);
8063 case NFT_MSG_DELCHAIN:
8064 nft_chain_del(trans->ctx.chain);
8065 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8066 nf_tables_unregister_hook(trans->ctx.net,
8070 case NFT_MSG_NEWRULE:
8071 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8072 nf_tables_rule_notify(&trans->ctx,
8073 nft_trans_rule(trans),
8075 nft_trans_destroy(trans);
8077 case NFT_MSG_DELRULE:
8078 list_del_rcu(&nft_trans_rule(trans)->list);
8079 nf_tables_rule_notify(&trans->ctx,
8080 nft_trans_rule(trans),
8082 nft_rule_expr_deactivate(&trans->ctx,
8083 nft_trans_rule(trans),
8086 case NFT_MSG_NEWSET:
8087 nft_clear(net, nft_trans_set(trans));
8088 /* This avoids hitting -EBUSY when deleting the table
8089 * from the transaction.
8091 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8092 !list_empty(&nft_trans_set(trans)->bindings))
8093 trans->ctx.table->use--;
8095 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8096 NFT_MSG_NEWSET, GFP_KERNEL);
8097 nft_trans_destroy(trans);
8099 case NFT_MSG_DELSET:
8100 list_del_rcu(&nft_trans_set(trans)->list);
8101 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8102 NFT_MSG_DELSET, GFP_KERNEL);
8104 case NFT_MSG_NEWSETELEM:
8105 te = (struct nft_trans_elem *)trans->data;
8107 te->set->ops->activate(net, te->set, &te->elem);
8108 nf_tables_setelem_notify(&trans->ctx, te->set,
8110 NFT_MSG_NEWSETELEM, 0);
8111 nft_trans_destroy(trans);
8113 case NFT_MSG_DELSETELEM:
8114 te = (struct nft_trans_elem *)trans->data;
8116 nf_tables_setelem_notify(&trans->ctx, te->set,
8118 NFT_MSG_DELSETELEM, 0);
8119 te->set->ops->remove(net, te->set, &te->elem);
8120 atomic_dec(&te->set->nelems);
8123 case NFT_MSG_NEWOBJ:
8124 if (nft_trans_obj_update(trans)) {
8125 nft_obj_commit_update(trans);
8126 nf_tables_obj_notify(&trans->ctx,
8127 nft_trans_obj(trans),
8130 nft_clear(net, nft_trans_obj(trans));
8131 nf_tables_obj_notify(&trans->ctx,
8132 nft_trans_obj(trans),
8134 nft_trans_destroy(trans);
8137 case NFT_MSG_DELOBJ:
8138 nft_obj_del(nft_trans_obj(trans));
8139 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8142 case NFT_MSG_NEWFLOWTABLE:
8143 if (nft_trans_flowtable_update(trans)) {
8144 nf_tables_flowtable_notify(&trans->ctx,
8145 nft_trans_flowtable(trans),
8146 &nft_trans_flowtable_hooks(trans),
8147 NFT_MSG_NEWFLOWTABLE);
8148 list_splice(&nft_trans_flowtable_hooks(trans),
8149 &nft_trans_flowtable(trans)->hook_list);
8151 nft_clear(net, nft_trans_flowtable(trans));
8152 nf_tables_flowtable_notify(&trans->ctx,
8153 nft_trans_flowtable(trans),
8154 &nft_trans_flowtable(trans)->hook_list,
8155 NFT_MSG_NEWFLOWTABLE);
8157 nft_trans_destroy(trans);
8159 case NFT_MSG_DELFLOWTABLE:
8160 if (nft_trans_flowtable_update(trans)) {
8161 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8162 &nft_trans_flowtable_hooks(trans));
8163 nf_tables_flowtable_notify(&trans->ctx,
8164 nft_trans_flowtable(trans),
8165 &nft_trans_flowtable_hooks(trans),
8166 NFT_MSG_DELFLOWTABLE);
8167 nft_unregister_flowtable_net_hooks(net,
8168 &nft_trans_flowtable_hooks(trans));
8170 list_del_rcu(&nft_trans_flowtable(trans)->list);
8171 nf_tables_flowtable_notify(&trans->ctx,
8172 nft_trans_flowtable(trans),
8173 &nft_trans_flowtable(trans)->hook_list,
8174 NFT_MSG_DELFLOWTABLE);
8175 nft_unregister_flowtable_net_hooks(net,
8176 &nft_trans_flowtable(trans)->hook_list);
8182 nft_commit_notify(net, NETLINK_CB(skb).portid);
8183 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8184 nf_tables_commit_release(net);
8189 static void nf_tables_module_autoload(struct net *net)
8191 struct nft_module_request *req, *next;
8192 LIST_HEAD(module_list);
8194 list_splice_init(&net->nft.module_list, &module_list);
8195 mutex_unlock(&net->nft.commit_mutex);
8196 list_for_each_entry_safe(req, next, &module_list, list) {
8197 request_module("%s", req->module);
8200 mutex_lock(&net->nft.commit_mutex);
8201 list_splice(&module_list, &net->nft.module_list);
8204 static void nf_tables_abort_release(struct nft_trans *trans)
8206 switch (trans->msg_type) {
8207 case NFT_MSG_NEWTABLE:
8208 nf_tables_table_destroy(&trans->ctx);
8210 case NFT_MSG_NEWCHAIN:
8211 nf_tables_chain_destroy(&trans->ctx);
8213 case NFT_MSG_NEWRULE:
8214 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8216 case NFT_MSG_NEWSET:
8217 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8219 case NFT_MSG_NEWSETELEM:
8220 nft_set_elem_destroy(nft_trans_elem_set(trans),
8221 nft_trans_elem(trans).priv, true);
8223 case NFT_MSG_NEWOBJ:
8224 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8226 case NFT_MSG_NEWFLOWTABLE:
8227 if (nft_trans_flowtable_update(trans))
8228 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8230 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8236 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8238 struct nft_trans *trans, *next;
8239 struct nft_trans_elem *te;
8240 struct nft_hook *hook;
8242 if (action == NFNL_ABORT_VALIDATE &&
8243 nf_tables_validate(net) < 0)
8246 list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
8248 switch (trans->msg_type) {
8249 case NFT_MSG_NEWTABLE:
8250 if (nft_trans_table_update(trans)) {
8251 if (nft_trans_table_enable(trans)) {
8252 nf_tables_table_disable(net,
8254 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8256 nft_trans_destroy(trans);
8258 list_del_rcu(&trans->ctx.table->list);
8261 case NFT_MSG_DELTABLE:
8262 nft_clear(trans->ctx.net, trans->ctx.table);
8263 nft_trans_destroy(trans);
8265 case NFT_MSG_NEWCHAIN:
8266 if (nft_trans_chain_update(trans)) {
8267 free_percpu(nft_trans_chain_stats(trans));
8268 kfree(nft_trans_chain_name(trans));
8269 nft_trans_destroy(trans);
8271 if (nft_chain_is_bound(trans->ctx.chain)) {
8272 nft_trans_destroy(trans);
8275 trans->ctx.table->use--;
8276 nft_chain_del(trans->ctx.chain);
8277 nf_tables_unregister_hook(trans->ctx.net,
8282 case NFT_MSG_DELCHAIN:
8283 trans->ctx.table->use++;
8284 nft_clear(trans->ctx.net, trans->ctx.chain);
8285 nft_trans_destroy(trans);
8287 case NFT_MSG_NEWRULE:
8288 trans->ctx.chain->use--;
8289 list_del_rcu(&nft_trans_rule(trans)->list);
8290 nft_rule_expr_deactivate(&trans->ctx,
8291 nft_trans_rule(trans),
8294 case NFT_MSG_DELRULE:
8295 trans->ctx.chain->use++;
8296 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8297 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8298 nft_trans_destroy(trans);
8300 case NFT_MSG_NEWSET:
8301 trans->ctx.table->use--;
8302 if (nft_trans_set_bound(trans)) {
8303 nft_trans_destroy(trans);
8306 list_del_rcu(&nft_trans_set(trans)->list);
8308 case NFT_MSG_DELSET:
8309 trans->ctx.table->use++;
8310 nft_clear(trans->ctx.net, nft_trans_set(trans));
8311 nft_trans_destroy(trans);
8313 case NFT_MSG_NEWSETELEM:
8314 if (nft_trans_elem_set_bound(trans)) {
8315 nft_trans_destroy(trans);
8318 te = (struct nft_trans_elem *)trans->data;
8319 te->set->ops->remove(net, te->set, &te->elem);
8320 atomic_dec(&te->set->nelems);
8322 case NFT_MSG_DELSETELEM:
8323 te = (struct nft_trans_elem *)trans->data;
8325 nft_set_elem_activate(net, te->set, &te->elem);
8326 te->set->ops->activate(net, te->set, &te->elem);
8329 nft_trans_destroy(trans);
8331 case NFT_MSG_NEWOBJ:
8332 if (nft_trans_obj_update(trans)) {
8333 kfree(nft_trans_obj_newobj(trans));
8334 nft_trans_destroy(trans);
8336 trans->ctx.table->use--;
8337 nft_obj_del(nft_trans_obj(trans));
8340 case NFT_MSG_DELOBJ:
8341 trans->ctx.table->use++;
8342 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8343 nft_trans_destroy(trans);
8345 case NFT_MSG_NEWFLOWTABLE:
8346 if (nft_trans_flowtable_update(trans)) {
8347 nft_unregister_flowtable_net_hooks(net,
8348 &nft_trans_flowtable_hooks(trans));
8350 trans->ctx.table->use--;
8351 list_del_rcu(&nft_trans_flowtable(trans)->list);
8352 nft_unregister_flowtable_net_hooks(net,
8353 &nft_trans_flowtable(trans)->hook_list);
8356 case NFT_MSG_DELFLOWTABLE:
8357 if (nft_trans_flowtable_update(trans)) {
8358 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8359 hook->inactive = false;
8361 trans->ctx.table->use++;
8362 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8364 nft_trans_destroy(trans);
8371 list_for_each_entry_safe_reverse(trans, next,
8372 &net->nft.commit_list, list) {
8373 list_del(&trans->list);
8374 nf_tables_abort_release(trans);
8377 if (action == NFNL_ABORT_AUTOLOAD)
8378 nf_tables_module_autoload(net);
8380 nf_tables_module_autoload_cleanup(net);
8385 static void nf_tables_cleanup(struct net *net)
8387 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8390 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8391 enum nfnl_abort_action action)
8393 int ret = __nf_tables_abort(net, action);
8395 mutex_unlock(&net->nft.commit_mutex);
8400 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8404 mutex_lock(&net->nft.commit_mutex);
8406 genid_ok = genid == 0 || net->nft.base_seq == genid;
8408 mutex_unlock(&net->nft.commit_mutex);
8410 /* else, commit mutex has to be released by commit or abort function */
8414 static const struct nfnetlink_subsystem nf_tables_subsys = {
8415 .name = "nf_tables",
8416 .subsys_id = NFNL_SUBSYS_NFTABLES,
8417 .cb_count = NFT_MSG_MAX,
8419 .commit = nf_tables_commit,
8420 .abort = nf_tables_abort,
8421 .cleanup = nf_tables_cleanup,
8422 .valid_genid = nf_tables_valid_genid,
8423 .owner = THIS_MODULE,
8426 int nft_chain_validate_dependency(const struct nft_chain *chain,
8427 enum nft_chain_types type)
8429 const struct nft_base_chain *basechain;
8431 if (nft_is_base_chain(chain)) {
8432 basechain = nft_base_chain(chain);
8433 if (basechain->type->type != type)
8438 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
8440 int nft_chain_validate_hooks(const struct nft_chain *chain,
8441 unsigned int hook_flags)
8443 struct nft_base_chain *basechain;
8445 if (nft_is_base_chain(chain)) {
8446 basechain = nft_base_chain(chain);
8448 if ((1 << basechain->ops.hooknum) & hook_flags)
8456 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
8459 * Loop detection - walk through the ruleset beginning at the destination chain
8460 * of a new jump until either the source chain is reached (loop) or all
8461 * reachable chains have been traversed.
8463 * The loop check is performed whenever a new jump verdict is added to an
8464 * expression or verdict map or a verdict map is bound to a new chain.
8467 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8468 const struct nft_chain *chain);
8470 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
8471 struct nft_set *set,
8472 const struct nft_set_iter *iter,
8473 struct nft_set_elem *elem)
8475 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
8476 const struct nft_data *data;
8478 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
8479 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
8482 data = nft_set_ext_data(ext);
8483 switch (data->verdict.code) {
8486 return nf_tables_check_loops(ctx, data->verdict.chain);
8492 static int nf_tables_check_loops(const struct nft_ctx *ctx,
8493 const struct nft_chain *chain)
8495 const struct nft_rule *rule;
8496 const struct nft_expr *expr, *last;
8497 struct nft_set *set;
8498 struct nft_set_binding *binding;
8499 struct nft_set_iter iter;
8501 if (ctx->chain == chain)
8504 list_for_each_entry(rule, &chain->rules, list) {
8505 nft_rule_for_each_expr(expr, last, rule) {
8506 struct nft_immediate_expr *priv;
8507 const struct nft_data *data;
8510 if (strcmp(expr->ops->type->name, "immediate"))
8513 priv = nft_expr_priv(expr);
8514 if (priv->dreg != NFT_REG_VERDICT)
8518 switch (data->verdict.code) {
8521 err = nf_tables_check_loops(ctx,
8522 data->verdict.chain);
8531 list_for_each_entry(set, &ctx->table->sets, list) {
8532 if (!nft_is_active_next(ctx->net, set))
8534 if (!(set->flags & NFT_SET_MAP) ||
8535 set->dtype != NFT_DATA_VERDICT)
8538 list_for_each_entry(binding, &set->bindings, list) {
8539 if (!(binding->flags & NFT_SET_MAP) ||
8540 binding->chain != chain)
8543 iter.genmask = nft_genmask_next(ctx->net);
8547 iter.fn = nf_tables_loop_check_setelem;
8549 set->ops->walk(ctx, set, &iter);
8559 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
8561 * @attr: netlink attribute to fetch value from
8562 * @max: maximum value to be stored in dest
8563 * @dest: pointer to the variable
8565 * Parse, check and store a given u32 netlink attribute into variable.
8566 * This function returns -ERANGE if the value goes over maximum value.
8567 * Otherwise a 0 is returned and the attribute value is stored in the
8568 * destination variable.
8570 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
8574 val = ntohl(nla_get_be32(attr));
8581 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
8584 * nft_parse_register - parse a register value from a netlink attribute
8586 * @attr: netlink attribute
8588 * Parse and translate a register value from a netlink attribute.
8589 * Registers used to be 128 bit wide, these register numbers will be
8590 * mapped to the corresponding 32 bit register numbers.
8592 unsigned int nft_parse_register(const struct nlattr *attr)
8596 reg = ntohl(nla_get_be32(attr));
8598 case NFT_REG_VERDICT...NFT_REG_4:
8599 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
8601 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
8604 EXPORT_SYMBOL_GPL(nft_parse_register);
8607 * nft_dump_register - dump a register value to a netlink attribute
8609 * @skb: socket buffer
8610 * @attr: attribute number
8611 * @reg: register number
8613 * Construct a netlink attribute containing the register number. For
8614 * compatibility reasons, register numbers being a multiple of 4 are
8615 * translated to the corresponding 128 bit register numbers.
8617 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
8619 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
8620 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
8622 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
8624 return nla_put_be32(skb, attr, htonl(reg));
8626 EXPORT_SYMBOL_GPL(nft_dump_register);
8629 * nft_validate_register_load - validate a load from a register
8631 * @reg: the register number
8632 * @len: the length of the data
8634 * Validate that the input register is one of the general purpose
8635 * registers and that the length of the load is within the bounds.
8637 int nft_validate_register_load(enum nft_registers reg, unsigned int len)
8639 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8643 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
8648 EXPORT_SYMBOL_GPL(nft_validate_register_load);
8651 * nft_validate_register_store - validate an expressions' register store
8653 * @ctx: context of the expression performing the load
8654 * @reg: the destination register number
8655 * @data: the data to load
8656 * @type: the data type
8657 * @len: the length of the data
8659 * Validate that a data load uses the appropriate data type for
8660 * the destination register and the length is within the bounds.
8661 * A value of NULL for the data means that its runtime gathered
8664 int nft_validate_register_store(const struct nft_ctx *ctx,
8665 enum nft_registers reg,
8666 const struct nft_data *data,
8667 enum nft_data_types type, unsigned int len)
8672 case NFT_REG_VERDICT:
8673 if (type != NFT_DATA_VERDICT)
8677 (data->verdict.code == NFT_GOTO ||
8678 data->verdict.code == NFT_JUMP)) {
8679 err = nf_tables_check_loops(ctx, data->verdict.chain);
8686 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
8690 if (reg * NFT_REG32_SIZE + len >
8691 sizeof_field(struct nft_regs, data))
8694 if (data != NULL && type != NFT_DATA_VALUE)
8699 EXPORT_SYMBOL_GPL(nft_validate_register_store);
8701 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
8702 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
8703 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
8704 .len = NFT_CHAIN_MAXNAMELEN - 1 },
8705 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
8708 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
8709 struct nft_data_desc *desc, const struct nlattr *nla)
8711 u8 genmask = nft_genmask_next(ctx->net);
8712 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
8713 struct nft_chain *chain;
8716 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
8717 nft_verdict_policy, NULL);
8721 if (!tb[NFTA_VERDICT_CODE])
8723 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
8725 switch (data->verdict.code) {
8727 switch (data->verdict.code & NF_VERDICT_MASK) {
8742 if (tb[NFTA_VERDICT_CHAIN]) {
8743 chain = nft_chain_lookup(ctx->net, ctx->table,
8744 tb[NFTA_VERDICT_CHAIN],
8746 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
8747 chain = nft_chain_lookup_byid(ctx->net,
8748 tb[NFTA_VERDICT_CHAIN_ID]);
8750 return PTR_ERR(chain);
8756 return PTR_ERR(chain);
8757 if (nft_is_base_chain(chain))
8761 data->verdict.chain = chain;
8765 desc->len = sizeof(data->verdict);
8766 desc->type = NFT_DATA_VERDICT;
8770 static void nft_verdict_uninit(const struct nft_data *data)
8772 struct nft_chain *chain;
8773 struct nft_rule *rule;
8775 switch (data->verdict.code) {
8778 chain = data->verdict.chain;
8781 if (!nft_chain_is_bound(chain))
8784 chain->table->use--;
8785 list_for_each_entry(rule, &chain->rules, list)
8788 nft_chain_del(chain);
8793 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
8795 struct nlattr *nest;
8797 nest = nla_nest_start_noflag(skb, type);
8799 goto nla_put_failure;
8801 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
8802 goto nla_put_failure;
8807 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
8809 goto nla_put_failure;
8811 nla_nest_end(skb, nest);
8818 static int nft_value_init(const struct nft_ctx *ctx,
8819 struct nft_data *data, unsigned int size,
8820 struct nft_data_desc *desc, const struct nlattr *nla)
8830 nla_memcpy(data->data, nla, len);
8831 desc->type = NFT_DATA_VALUE;
8836 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
8839 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
8842 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
8843 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
8844 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
8848 * nft_data_init - parse nf_tables data netlink attributes
8850 * @ctx: context of the expression using the data
8851 * @data: destination struct nft_data
8852 * @size: maximum data length
8853 * @desc: data description
8854 * @nla: netlink attribute containing data
8856 * Parse the netlink data attributes and initialize a struct nft_data.
8857 * The type and length of data are returned in the data description.
8859 * The caller can indicate that it only wants to accept data of type
8860 * NFT_DATA_VALUE by passing NULL for the ctx argument.
8862 int nft_data_init(const struct nft_ctx *ctx,
8863 struct nft_data *data, unsigned int size,
8864 struct nft_data_desc *desc, const struct nlattr *nla)
8866 struct nlattr *tb[NFTA_DATA_MAX + 1];
8869 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
8870 nft_data_policy, NULL);
8874 if (tb[NFTA_DATA_VALUE])
8875 return nft_value_init(ctx, data, size, desc,
8876 tb[NFTA_DATA_VALUE]);
8877 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
8878 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
8881 EXPORT_SYMBOL_GPL(nft_data_init);
8884 * nft_data_release - release a nft_data item
8886 * @data: struct nft_data to release
8887 * @type: type of data
8889 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
8890 * all others need to be released by calling this function.
8892 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
8894 if (type < NFT_DATA_VERDICT)
8897 case NFT_DATA_VERDICT:
8898 return nft_verdict_uninit(data);
8903 EXPORT_SYMBOL_GPL(nft_data_release);
8905 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
8906 enum nft_data_types type, unsigned int len)
8908 struct nlattr *nest;
8911 nest = nla_nest_start_noflag(skb, attr);
8916 case NFT_DATA_VALUE:
8917 err = nft_value_dump(skb, data, len);
8919 case NFT_DATA_VERDICT:
8920 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
8927 nla_nest_end(skb, nest);
8930 EXPORT_SYMBOL_GPL(nft_data_dump);
8932 int __nft_release_basechain(struct nft_ctx *ctx)
8934 struct nft_rule *rule, *nr;
8936 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
8939 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
8940 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
8941 list_del(&rule->list);
8943 nf_tables_rule_release(ctx, rule);
8945 nft_chain_del(ctx->chain);
8947 nf_tables_chain_destroy(ctx);
8951 EXPORT_SYMBOL_GPL(__nft_release_basechain);
8953 static void __nft_release_tables(struct net *net)
8955 struct nft_flowtable *flowtable, *nf;
8956 struct nft_table *table, *nt;
8957 struct nft_chain *chain, *nc;
8958 struct nft_object *obj, *ne;
8959 struct nft_rule *rule, *nr;
8960 struct nft_set *set, *ns;
8961 struct nft_ctx ctx = {
8963 .family = NFPROTO_NETDEV,
8966 list_for_each_entry_safe(table, nt, &net->nft.tables, list) {
8967 ctx.family = table->family;
8969 list_for_each_entry(chain, &table->chains, list)
8970 nf_tables_unregister_hook(net, table, chain);
8971 /* No packets are walking on these chains anymore. */
8973 list_for_each_entry(chain, &table->chains, list) {
8975 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
8976 list_del(&rule->list);
8978 nf_tables_rule_release(&ctx, rule);
8981 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
8982 list_del(&flowtable->list);
8984 nf_tables_flowtable_destroy(flowtable);
8986 list_for_each_entry_safe(set, ns, &table->sets, list) {
8987 list_del(&set->list);
8989 nft_set_destroy(&ctx, set);
8991 list_for_each_entry_safe(obj, ne, &table->objects, list) {
8994 nft_obj_destroy(&ctx, obj);
8996 list_for_each_entry_safe(chain, nc, &table->chains, list) {
8998 nft_chain_del(chain);
9000 nf_tables_chain_destroy(&ctx);
9002 list_del(&table->list);
9003 nf_tables_table_destroy(&ctx);
9007 static int __net_init nf_tables_init_net(struct net *net)
9009 INIT_LIST_HEAD(&net->nft.tables);
9010 INIT_LIST_HEAD(&net->nft.commit_list);
9011 INIT_LIST_HEAD(&net->nft.module_list);
9012 INIT_LIST_HEAD(&net->nft.notify_list);
9013 mutex_init(&net->nft.commit_mutex);
9014 net->nft.base_seq = 1;
9015 net->nft.validate_state = NFT_VALIDATE_SKIP;
9020 static void __net_exit nf_tables_exit_net(struct net *net)
9022 mutex_lock(&net->nft.commit_mutex);
9023 if (!list_empty(&net->nft.commit_list))
9024 __nf_tables_abort(net, NFNL_ABORT_NONE);
9025 __nft_release_tables(net);
9026 mutex_unlock(&net->nft.commit_mutex);
9027 WARN_ON_ONCE(!list_empty(&net->nft.tables));
9028 WARN_ON_ONCE(!list_empty(&net->nft.module_list));
9029 WARN_ON_ONCE(!list_empty(&net->nft.notify_list));
9032 static struct pernet_operations nf_tables_net_ops = {
9033 .init = nf_tables_init_net,
9034 .exit = nf_tables_exit_net,
9037 static int __init nf_tables_module_init(void)
9041 spin_lock_init(&nf_tables_destroy_list_lock);
9042 err = register_pernet_subsys(&nf_tables_net_ops);
9046 err = nft_chain_filter_init();
9050 err = nf_tables_core_module_init();
9054 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9058 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9062 err = nft_offload_init();
9067 err = nfnetlink_subsys_register(&nf_tables_subsys);
9071 nft_chain_route_init();
9077 rhltable_destroy(&nft_objname_ht);
9079 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9081 nf_tables_core_module_exit();
9083 nft_chain_filter_fini();
9085 unregister_pernet_subsys(&nf_tables_net_ops);
9089 static void __exit nf_tables_module_exit(void)
9091 nfnetlink_subsys_unregister(&nf_tables_subsys);
9093 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9094 nft_chain_filter_fini();
9095 nft_chain_route_fini();
9096 unregister_pernet_subsys(&nf_tables_net_ops);
9097 cancel_work_sync(&trans_destroy_work);
9099 rhltable_destroy(&nft_objname_ht);
9100 nf_tables_core_module_exit();
9103 module_init(nf_tables_module_init);
9104 module_exit(nf_tables_module_exit);
9106 MODULE_LICENSE("GPL");
9107 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9108 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);