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 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
35 static u64 table_handle;
38 NFT_VALIDATE_SKIP = 0,
43 static struct rhltable nft_objname_ht;
45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
53 static const struct rhashtable_params nft_chain_ht_params = {
54 .head_offset = offsetof(struct nft_chain, rhlhead),
55 .key_offset = offsetof(struct nft_chain, name),
56 .hashfn = nft_chain_hash,
57 .obj_hashfn = nft_chain_hash_obj,
58 .obj_cmpfn = nft_chain_hash_cmp,
59 .automatic_shrinking = true,
62 static const struct rhashtable_params nft_objname_ht_params = {
63 .head_offset = offsetof(struct nft_object, rhlhead),
64 .key_offset = offsetof(struct nft_object, key),
65 .hashfn = nft_objname_hash,
66 .obj_hashfn = nft_objname_hash_obj,
67 .obj_cmpfn = nft_objname_hash_cmp,
68 .automatic_shrinking = true,
71 struct nft_audit_data {
72 struct nft_table *table;
75 struct list_head list;
78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
108 struct nftables_pernet *nft_net = nft_pernet(net);
110 switch (nft_net->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 nft_net->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_ctx_init(struct nft_ctx *ctx,
128 const struct sk_buff *skb,
129 const struct nlmsghdr *nlh,
131 struct nft_table *table,
132 struct nft_chain *chain,
133 const struct nlattr * const *nla)
136 ctx->family = family;
141 ctx->portid = NETLINK_CB(skb).portid;
142 ctx->report = nlmsg_report(nlh);
143 ctx->flags = nlh->nlmsg_flags;
144 ctx->seq = nlh->nlmsg_seq;
147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
148 int msg_type, u32 size, gfp_t gfp)
150 struct nft_trans *trans;
152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
156 trans->msg_type = msg_type;
162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
168 static void nft_trans_destroy(struct nft_trans *trans)
170 list_del(&trans->list);
174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
180 if (!nft_set_is_anonymous(set))
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
198 static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
201 struct nft_hook *hook;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
215 list_for_each_entry(hook, hook_list, list) {
219 nf_unregister_net_hook(net, &hook->ops);
224 static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list)
227 struct nft_hook *hook;
229 list_for_each_entry(hook, hook_list, list)
230 nf_unregister_net_hook(net, &hook->ops);
233 static int nf_tables_register_hook(struct net *net,
234 const struct nft_table *table,
235 struct nft_chain *chain)
237 struct nft_base_chain *basechain;
238 const struct nf_hook_ops *ops;
240 if (table->flags & NFT_TABLE_F_DORMANT ||
241 !nft_is_base_chain(chain))
244 basechain = nft_base_chain(chain);
245 ops = &basechain->ops;
247 if (basechain->type->ops_register)
248 return basechain->type->ops_register(net, ops);
250 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
251 return nft_netdev_register_hooks(net, &basechain->hook_list);
253 return nf_register_net_hook(net, &basechain->ops);
256 static void nf_tables_unregister_hook(struct net *net,
257 const struct nft_table *table,
258 struct nft_chain *chain)
260 struct nft_base_chain *basechain;
261 const struct nf_hook_ops *ops;
263 if (table->flags & NFT_TABLE_F_DORMANT ||
264 !nft_is_base_chain(chain))
266 basechain = nft_base_chain(chain);
267 ops = &basechain->ops;
269 if (basechain->type->ops_unregister)
270 return basechain->type->ops_unregister(net, ops);
272 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
273 nft_netdev_unregister_hooks(net, &basechain->hook_list);
275 nf_unregister_net_hook(net, &basechain->ops);
278 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
280 struct nftables_pernet *nft_net = nft_pernet(net);
282 list_add_tail(&trans->list, &nft_net->commit_list);
285 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
287 struct nft_trans *trans;
289 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
293 if (msg_type == NFT_MSG_NEWTABLE)
294 nft_activate_next(ctx->net, ctx->table);
296 nft_trans_commit_list_add_tail(ctx->net, trans);
300 static int nft_deltable(struct nft_ctx *ctx)
304 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
308 nft_deactivate_next(ctx->net, ctx->table);
312 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
314 struct nft_trans *trans;
316 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
318 return ERR_PTR(-ENOMEM);
320 if (msg_type == NFT_MSG_NEWCHAIN) {
321 nft_activate_next(ctx->net, ctx->chain);
323 if (ctx->nla[NFTA_CHAIN_ID]) {
324 nft_trans_chain_id(trans) =
325 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
329 nft_trans_commit_list_add_tail(ctx->net, trans);
333 static int nft_delchain(struct nft_ctx *ctx)
335 struct nft_trans *trans;
337 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
339 return PTR_ERR(trans);
342 nft_deactivate_next(ctx->net, ctx->chain);
347 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
348 struct nft_rule *rule)
350 struct nft_expr *expr;
352 expr = nft_expr_first(rule);
353 while (nft_expr_more(rule, expr)) {
354 if (expr->ops->activate)
355 expr->ops->activate(ctx, expr);
357 expr = nft_expr_next(expr);
361 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
362 struct nft_rule *rule,
363 enum nft_trans_phase phase)
365 struct nft_expr *expr;
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->deactivate)
370 expr->ops->deactivate(ctx, expr, phase);
372 expr = nft_expr_next(expr);
377 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
379 /* You cannot delete the same rule twice */
380 if (nft_is_active_next(ctx->net, rule)) {
381 nft_deactivate_next(ctx->net, rule);
388 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
389 struct nft_rule *rule)
391 struct nft_trans *trans;
393 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
397 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
398 nft_trans_rule_id(trans) =
399 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
401 nft_trans_rule(trans) = rule;
402 nft_trans_commit_list_add_tail(ctx->net, trans);
407 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
409 struct nft_flow_rule *flow;
410 struct nft_trans *trans;
413 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
417 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
418 flow = nft_flow_rule_create(ctx->net, rule);
420 nft_trans_destroy(trans);
421 return PTR_ERR(flow);
424 nft_trans_flow_rule(trans) = flow;
427 err = nf_tables_delrule_deactivate(ctx, rule);
429 nft_trans_destroy(trans);
432 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
437 static int nft_delrule_by_chain(struct nft_ctx *ctx)
439 struct nft_rule *rule;
442 list_for_each_entry(rule, &ctx->chain->rules, list) {
443 if (!nft_is_active_next(ctx->net, rule))
446 err = nft_delrule(ctx, rule);
453 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
456 struct nft_trans *trans;
458 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
462 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
463 nft_trans_set_id(trans) =
464 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
465 nft_activate_next(ctx->net, set);
467 nft_trans_set(trans) = set;
468 nft_trans_commit_list_add_tail(ctx->net, trans);
473 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
477 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
481 nft_deactivate_next(ctx->net, set);
487 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
488 struct nft_object *obj)
490 struct nft_trans *trans;
492 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
496 if (msg_type == NFT_MSG_NEWOBJ)
497 nft_activate_next(ctx->net, obj);
499 nft_trans_obj(trans) = obj;
500 nft_trans_commit_list_add_tail(ctx->net, trans);
505 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
509 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
513 nft_deactivate_next(ctx->net, obj);
519 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
520 struct nft_flowtable *flowtable)
522 struct nft_trans *trans;
524 trans = nft_trans_alloc(ctx, msg_type,
525 sizeof(struct nft_trans_flowtable));
529 if (msg_type == NFT_MSG_NEWFLOWTABLE)
530 nft_activate_next(ctx->net, flowtable);
532 nft_trans_flowtable(trans) = flowtable;
533 nft_trans_commit_list_add_tail(ctx->net, trans);
538 static int nft_delflowtable(struct nft_ctx *ctx,
539 struct nft_flowtable *flowtable)
543 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
547 nft_deactivate_next(ctx->net, flowtable);
557 static struct nft_table *nft_table_lookup(const struct net *net,
558 const struct nlattr *nla,
559 u8 family, u8 genmask, u32 nlpid)
561 struct nftables_pernet *nft_net;
562 struct nft_table *table;
565 return ERR_PTR(-EINVAL);
567 nft_net = nft_pernet(net);
568 list_for_each_entry_rcu(table, &nft_net->tables, list,
569 lockdep_is_held(&nft_net->commit_mutex)) {
570 if (!nla_strcmp(nla, table->name) &&
571 table->family == family &&
572 nft_active_genmask(table, genmask)) {
573 if (nft_table_has_owner(table) &&
574 nlpid && table->nlpid != nlpid)
575 return ERR_PTR(-EPERM);
581 return ERR_PTR(-ENOENT);
584 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
585 const struct nlattr *nla,
586 u8 genmask, u32 nlpid)
588 struct nftables_pernet *nft_net;
589 struct nft_table *table;
591 nft_net = nft_pernet(net);
592 list_for_each_entry(table, &nft_net->tables, list) {
593 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
594 nft_active_genmask(table, genmask)) {
595 if (nft_table_has_owner(table) &&
596 nlpid && table->nlpid != nlpid)
597 return ERR_PTR(-EPERM);
603 return ERR_PTR(-ENOENT);
606 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
608 return ++table->hgenerator;
611 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
613 static const struct nft_chain_type *
614 __nft_chain_type_get(u8 family, enum nft_chain_types type)
616 if (family >= NFPROTO_NUMPROTO ||
617 type >= NFT_CHAIN_T_MAX)
620 return chain_type[family][type];
623 static const struct nft_chain_type *
624 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
626 const struct nft_chain_type *type;
629 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
630 type = __nft_chain_type_get(family, i);
633 if (!nla_strcmp(nla, type->name))
639 struct nft_module_request {
640 struct list_head list;
641 char module[MODULE_NAME_LEN];
645 #ifdef CONFIG_MODULES
646 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
649 char module_name[MODULE_NAME_LEN];
650 struct nftables_pernet *nft_net;
651 struct nft_module_request *req;
656 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
658 if (ret >= MODULE_NAME_LEN)
661 nft_net = nft_pernet(net);
662 list_for_each_entry(req, &nft_net->module_list, list) {
663 if (!strcmp(req->module, module_name)) {
667 /* A request to load this module already exists. */
672 req = kmalloc(sizeof(*req), GFP_KERNEL);
677 strlcpy(req->module, module_name, MODULE_NAME_LEN);
678 list_add_tail(&req->list, &nft_net->module_list);
682 EXPORT_SYMBOL_GPL(nft_request_module);
685 static void lockdep_nfnl_nft_mutex_not_held(void)
687 #ifdef CONFIG_PROVE_LOCKING
689 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
693 static const struct nft_chain_type *
694 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
695 u8 family, bool autoload)
697 const struct nft_chain_type *type;
699 type = __nf_tables_chain_type_lookup(nla, family);
703 lockdep_nfnl_nft_mutex_not_held();
704 #ifdef CONFIG_MODULES
706 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
708 (const char *)nla_data(nla)) == -EAGAIN)
709 return ERR_PTR(-EAGAIN);
712 return ERR_PTR(-ENOENT);
715 static __be16 nft_base_seq(const struct net *net)
717 struct nftables_pernet *nft_net = nft_pernet(net);
719 return htons(nft_net->base_seq & 0xffff);
722 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
723 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
724 .len = NFT_TABLE_MAXNAMELEN - 1 },
725 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
726 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
727 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
728 .len = NFT_USERDATA_MAXLEN }
731 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
732 u32 portid, u32 seq, int event, u32 flags,
733 int family, const struct nft_table *table)
735 struct nlmsghdr *nlh;
737 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
738 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
739 NFNETLINK_V0, nft_base_seq(net));
741 goto nla_put_failure;
743 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
744 nla_put_be32(skb, NFTA_TABLE_FLAGS,
745 htonl(table->flags & NFT_TABLE_F_MASK)) ||
746 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
747 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
749 goto nla_put_failure;
750 if (nft_table_has_owner(table) &&
751 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
752 goto nla_put_failure;
755 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
756 goto nla_put_failure;
763 nlmsg_trim(skb, nlh);
767 struct nftnl_skb_parms {
770 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
772 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
773 struct list_head *notify_list)
775 NFT_CB(skb).report = report;
776 list_add_tail(&skb->list, notify_list);
779 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
781 struct nftables_pernet *nft_net;
787 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
790 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
794 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
795 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
797 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
798 event, flags, ctx->family, ctx->table);
804 nft_net = nft_pernet(ctx->net);
805 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
808 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
811 static int nf_tables_dump_tables(struct sk_buff *skb,
812 struct netlink_callback *cb)
814 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
815 struct nftables_pernet *nft_net;
816 const struct nft_table *table;
817 unsigned int idx = 0, s_idx = cb->args[0];
818 struct net *net = sock_net(skb->sk);
819 int family = nfmsg->nfgen_family;
822 nft_net = nft_pernet(net);
823 cb->seq = nft_net->base_seq;
825 list_for_each_entry_rcu(table, &nft_net->tables, list) {
826 if (family != NFPROTO_UNSPEC && family != table->family)
832 memset(&cb->args[1], 0,
833 sizeof(cb->args) - sizeof(cb->args[0]));
834 if (!nft_is_active(net, table))
836 if (nf_tables_fill_table_info(skb, net,
837 NETLINK_CB(cb->skb).portid,
839 NFT_MSG_NEWTABLE, NLM_F_MULTI,
840 table->family, table) < 0)
843 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
853 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
854 const struct nlmsghdr *nlh,
855 struct netlink_dump_control *c)
859 if (!try_module_get(THIS_MODULE))
863 err = netlink_dump_start(nlsk, skb, nlh, c);
865 module_put(THIS_MODULE);
870 /* called with rcu_read_lock held */
871 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
872 const struct nlattr * const nla[])
874 struct netlink_ext_ack *extack = info->extack;
875 u8 genmask = nft_genmask_cur(info->net);
876 u8 family = info->nfmsg->nfgen_family;
877 const struct nft_table *table;
878 struct net *net = info->net;
879 struct sk_buff *skb2;
882 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
883 struct netlink_dump_control c = {
884 .dump = nf_tables_dump_tables,
885 .module = THIS_MODULE,
888 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
891 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
893 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
894 return PTR_ERR(table);
897 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
901 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
902 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
905 goto err_fill_table_info;
907 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
914 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
916 struct nft_chain *chain;
919 list_for_each_entry(chain, &table->chains, list) {
920 if (!nft_is_active_next(net, chain))
922 if (!nft_is_base_chain(chain))
925 if (cnt && i++ == cnt)
928 nf_tables_unregister_hook(net, table, chain);
932 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
934 struct nft_chain *chain;
937 list_for_each_entry(chain, &table->chains, list) {
938 if (!nft_is_active_next(net, chain))
940 if (!nft_is_base_chain(chain))
943 err = nf_tables_register_hook(net, table, chain);
945 goto err_register_hooks;
953 nft_table_disable(net, table, i);
957 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
959 table->flags &= ~NFT_TABLE_F_DORMANT;
960 nft_table_disable(net, table, 0);
961 table->flags |= NFT_TABLE_F_DORMANT;
964 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
965 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
966 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
967 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
968 __NFT_TABLE_F_WAS_AWAKEN)
970 static int nf_tables_updtable(struct nft_ctx *ctx)
972 struct nft_trans *trans;
976 if (!ctx->nla[NFTA_TABLE_FLAGS])
979 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
980 if (flags & ~NFT_TABLE_F_MASK)
983 if (flags == ctx->table->flags)
986 if ((nft_table_has_owner(ctx->table) &&
987 !(flags & NFT_TABLE_F_OWNER)) ||
988 (!nft_table_has_owner(ctx->table) &&
989 flags & NFT_TABLE_F_OWNER))
992 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
993 sizeof(struct nft_trans_table));
997 if ((flags & NFT_TABLE_F_DORMANT) &&
998 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
999 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1000 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1001 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1002 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1003 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1004 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1005 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1006 ret = nf_tables_table_enable(ctx->net, ctx->table);
1008 goto err_register_hooks;
1010 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1014 nft_trans_table_update(trans) = true;
1015 nft_trans_commit_list_add_tail(ctx->net, trans);
1020 nft_trans_destroy(trans);
1024 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1026 const char *name = data;
1028 return jhash(name, strlen(name), seed);
1031 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1033 const struct nft_chain *chain = data;
1035 return nft_chain_hash(chain->name, 0, seed);
1038 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1041 const struct nft_chain *chain = ptr;
1042 const char *name = arg->key;
1044 return strcmp(chain->name, name);
1047 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1049 const struct nft_object_hash_key *k = data;
1051 seed ^= hash_ptr(k->table, 32);
1053 return jhash(k->name, strlen(k->name), seed);
1056 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1058 const struct nft_object *obj = data;
1060 return nft_objname_hash(&obj->key, 0, seed);
1063 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1066 const struct nft_object_hash_key *k = arg->key;
1067 const struct nft_object *obj = ptr;
1069 if (obj->key.table != k->table)
1072 return strcmp(obj->key.name, k->name);
1075 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1076 const struct nlattr * const nla[])
1078 struct nftables_pernet *nft_net = nft_pernet(info->net);
1079 struct netlink_ext_ack *extack = info->extack;
1080 u8 genmask = nft_genmask_next(info->net);
1081 u8 family = info->nfmsg->nfgen_family;
1082 struct net *net = info->net;
1083 const struct nlattr *attr;
1084 struct nft_table *table;
1089 lockdep_assert_held(&nft_net->commit_mutex);
1090 attr = nla[NFTA_TABLE_NAME];
1091 table = nft_table_lookup(net, attr, family, genmask,
1092 NETLINK_CB(skb).portid);
1093 if (IS_ERR(table)) {
1094 if (PTR_ERR(table) != -ENOENT)
1095 return PTR_ERR(table);
1097 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1098 NL_SET_BAD_ATTR(extack, attr);
1101 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1104 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1106 return nf_tables_updtable(&ctx);
1109 if (nla[NFTA_TABLE_FLAGS]) {
1110 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1111 if (flags & ~NFT_TABLE_F_MASK)
1116 table = kzalloc(sizeof(*table), GFP_KERNEL);
1120 table->name = nla_strdup(attr, GFP_KERNEL);
1121 if (table->name == NULL)
1124 if (nla[NFTA_TABLE_USERDATA]) {
1125 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1126 if (table->udata == NULL)
1127 goto err_table_udata;
1129 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1132 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1136 INIT_LIST_HEAD(&table->chains);
1137 INIT_LIST_HEAD(&table->sets);
1138 INIT_LIST_HEAD(&table->objects);
1139 INIT_LIST_HEAD(&table->flowtables);
1140 table->family = family;
1141 table->flags = flags;
1142 table->handle = ++table_handle;
1143 if (table->flags & NFT_TABLE_F_OWNER)
1144 table->nlpid = NETLINK_CB(skb).portid;
1146 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1147 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1151 list_add_tail_rcu(&table->list, &nft_net->tables);
1154 rhltable_destroy(&table->chains_ht);
1156 kfree(table->udata);
1165 static int nft_flush_table(struct nft_ctx *ctx)
1167 struct nft_flowtable *flowtable, *nft;
1168 struct nft_chain *chain, *nc;
1169 struct nft_object *obj, *ne;
1170 struct nft_set *set, *ns;
1173 list_for_each_entry(chain, &ctx->table->chains, list) {
1174 if (!nft_is_active_next(ctx->net, chain))
1177 if (nft_chain_is_bound(chain))
1182 err = nft_delrule_by_chain(ctx);
1187 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1188 if (!nft_is_active_next(ctx->net, set))
1191 if (nft_set_is_anonymous(set) &&
1192 !list_empty(&set->bindings))
1195 err = nft_delset(ctx, set);
1200 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1201 if (!nft_is_active_next(ctx->net, flowtable))
1204 err = nft_delflowtable(ctx, flowtable);
1209 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1210 if (!nft_is_active_next(ctx->net, obj))
1213 err = nft_delobj(ctx, obj);
1218 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1219 if (!nft_is_active_next(ctx->net, chain))
1222 if (nft_chain_is_bound(chain))
1227 err = nft_delchain(ctx);
1232 err = nft_deltable(ctx);
1237 static int nft_flush(struct nft_ctx *ctx, int family)
1239 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1240 const struct nlattr * const *nla = ctx->nla;
1241 struct nft_table *table, *nt;
1244 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1245 if (family != AF_UNSPEC && table->family != family)
1248 ctx->family = table->family;
1250 if (!nft_is_active_next(ctx->net, table))
1253 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1256 if (nla[NFTA_TABLE_NAME] &&
1257 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1262 err = nft_flush_table(ctx);
1270 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1271 const struct nlattr * const nla[])
1273 struct netlink_ext_ack *extack = info->extack;
1274 u8 genmask = nft_genmask_next(info->net);
1275 u8 family = info->nfmsg->nfgen_family;
1276 struct net *net = info->net;
1277 const struct nlattr *attr;
1278 struct nft_table *table;
1281 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1282 if (family == AF_UNSPEC ||
1283 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1284 return nft_flush(&ctx, family);
1286 if (nla[NFTA_TABLE_HANDLE]) {
1287 attr = nla[NFTA_TABLE_HANDLE];
1288 table = nft_table_lookup_byhandle(net, attr, genmask,
1289 NETLINK_CB(skb).portid);
1291 attr = nla[NFTA_TABLE_NAME];
1292 table = nft_table_lookup(net, attr, family, genmask,
1293 NETLINK_CB(skb).portid);
1296 if (IS_ERR(table)) {
1297 NL_SET_BAD_ATTR(extack, attr);
1298 return PTR_ERR(table);
1301 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1305 ctx.family = family;
1308 return nft_flush_table(&ctx);
1311 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1313 if (WARN_ON(ctx->table->use > 0))
1316 rhltable_destroy(&ctx->table->chains_ht);
1317 kfree(ctx->table->name);
1318 kfree(ctx->table->udata);
1322 void nft_register_chain_type(const struct nft_chain_type *ctype)
1324 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1325 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1326 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1329 chain_type[ctype->family][ctype->type] = ctype;
1330 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1332 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1334 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1336 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1337 chain_type[ctype->family][ctype->type] = NULL;
1338 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1340 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1346 static struct nft_chain *
1347 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1349 struct nft_chain *chain;
1351 list_for_each_entry(chain, &table->chains, list) {
1352 if (chain->handle == handle &&
1353 nft_active_genmask(chain, genmask))
1357 return ERR_PTR(-ENOENT);
1360 static bool lockdep_commit_lock_is_held(const struct net *net)
1362 #ifdef CONFIG_PROVE_LOCKING
1363 struct nftables_pernet *nft_net = nft_pernet(net);
1365 return lockdep_is_held(&nft_net->commit_mutex);
1371 static struct nft_chain *nft_chain_lookup(struct net *net,
1372 struct nft_table *table,
1373 const struct nlattr *nla, u8 genmask)
1375 char search[NFT_CHAIN_MAXNAMELEN + 1];
1376 struct rhlist_head *tmp, *list;
1377 struct nft_chain *chain;
1380 return ERR_PTR(-EINVAL);
1382 nla_strscpy(search, nla, sizeof(search));
1384 WARN_ON(!rcu_read_lock_held() &&
1385 !lockdep_commit_lock_is_held(net));
1387 chain = ERR_PTR(-ENOENT);
1389 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1393 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1394 if (nft_active_genmask(chain, genmask))
1397 chain = ERR_PTR(-ENOENT);
1403 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1404 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1405 .len = NFT_TABLE_MAXNAMELEN - 1 },
1406 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1407 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1408 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1409 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1410 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1411 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1412 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1413 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1414 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1415 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1416 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1417 .len = NFT_USERDATA_MAXLEN },
1420 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1421 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1422 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1423 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1424 .len = IFNAMSIZ - 1 },
1427 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1429 struct nft_stats *cpu_stats, total;
1430 struct nlattr *nest;
1438 memset(&total, 0, sizeof(total));
1439 for_each_possible_cpu(cpu) {
1440 cpu_stats = per_cpu_ptr(stats, cpu);
1442 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1443 pkts = cpu_stats->pkts;
1444 bytes = cpu_stats->bytes;
1445 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1447 total.bytes += bytes;
1449 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1451 goto nla_put_failure;
1453 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1454 NFTA_COUNTER_PAD) ||
1455 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1457 goto nla_put_failure;
1459 nla_nest_end(skb, nest);
1466 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1467 const struct nft_base_chain *basechain)
1469 const struct nf_hook_ops *ops = &basechain->ops;
1470 struct nft_hook *hook, *first = NULL;
1471 struct nlattr *nest, *nest_devs;
1474 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1476 goto nla_put_failure;
1477 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1478 goto nla_put_failure;
1479 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1480 goto nla_put_failure;
1482 if (nft_base_chain_netdev(family, ops->hooknum)) {
1483 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1484 list_for_each_entry(hook, &basechain->hook_list, list) {
1488 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1489 hook->ops.dev->name))
1490 goto nla_put_failure;
1493 nla_nest_end(skb, nest_devs);
1496 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1497 goto nla_put_failure;
1499 nla_nest_end(skb, nest);
1506 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1507 u32 portid, u32 seq, int event, u32 flags,
1508 int family, const struct nft_table *table,
1509 const struct nft_chain *chain)
1511 struct nlmsghdr *nlh;
1513 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1514 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1515 NFNETLINK_V0, nft_base_seq(net));
1517 goto nla_put_failure;
1519 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1520 goto nla_put_failure;
1521 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1523 goto nla_put_failure;
1524 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1525 goto nla_put_failure;
1527 if (nft_is_base_chain(chain)) {
1528 const struct nft_base_chain *basechain = nft_base_chain(chain);
1529 struct nft_stats __percpu *stats;
1531 if (nft_dump_basechain_hook(skb, family, basechain))
1532 goto nla_put_failure;
1534 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1535 htonl(basechain->policy)))
1536 goto nla_put_failure;
1538 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1539 goto nla_put_failure;
1541 stats = rcu_dereference_check(basechain->stats,
1542 lockdep_commit_lock_is_held(net));
1543 if (nft_dump_stats(skb, stats))
1544 goto nla_put_failure;
1548 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1549 goto nla_put_failure;
1551 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1552 goto nla_put_failure;
1555 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1556 goto nla_put_failure;
1558 nlmsg_end(skb, nlh);
1562 nlmsg_trim(skb, nlh);
1566 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1568 struct nftables_pernet *nft_net;
1569 struct sk_buff *skb;
1574 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1577 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1581 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1582 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1584 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1585 event, flags, ctx->family, ctx->table,
1592 nft_net = nft_pernet(ctx->net);
1593 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1596 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1599 static int nf_tables_dump_chains(struct sk_buff *skb,
1600 struct netlink_callback *cb)
1602 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1603 unsigned int idx = 0, s_idx = cb->args[0];
1604 struct net *net = sock_net(skb->sk);
1605 int family = nfmsg->nfgen_family;
1606 struct nftables_pernet *nft_net;
1607 const struct nft_table *table;
1608 const struct nft_chain *chain;
1611 nft_net = nft_pernet(net);
1612 cb->seq = nft_net->base_seq;
1614 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1615 if (family != NFPROTO_UNSPEC && family != table->family)
1618 list_for_each_entry_rcu(chain, &table->chains, list) {
1622 memset(&cb->args[1], 0,
1623 sizeof(cb->args) - sizeof(cb->args[0]));
1624 if (!nft_is_active(net, chain))
1626 if (nf_tables_fill_chain_info(skb, net,
1627 NETLINK_CB(cb->skb).portid,
1631 table->family, table,
1635 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1646 /* called with rcu_read_lock held */
1647 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1648 const struct nlattr * const nla[])
1650 struct netlink_ext_ack *extack = info->extack;
1651 u8 genmask = nft_genmask_cur(info->net);
1652 u8 family = info->nfmsg->nfgen_family;
1653 const struct nft_chain *chain;
1654 struct net *net = info->net;
1655 struct nft_table *table;
1656 struct sk_buff *skb2;
1659 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1660 struct netlink_dump_control c = {
1661 .dump = nf_tables_dump_chains,
1662 .module = THIS_MODULE,
1665 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1668 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1669 if (IS_ERR(table)) {
1670 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1671 return PTR_ERR(table);
1674 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1675 if (IS_ERR(chain)) {
1676 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1677 return PTR_ERR(chain);
1680 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1684 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1685 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1686 0, family, table, chain);
1688 goto err_fill_chain_info;
1690 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1692 err_fill_chain_info:
1697 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1698 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1699 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1702 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1704 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1705 struct nft_stats __percpu *newstats;
1706 struct nft_stats *stats;
1709 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1710 nft_counter_policy, NULL);
1712 return ERR_PTR(err);
1714 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1715 return ERR_PTR(-EINVAL);
1717 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1718 if (newstats == NULL)
1719 return ERR_PTR(-ENOMEM);
1721 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1722 * are not exposed to userspace.
1725 stats = this_cpu_ptr(newstats);
1726 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1727 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1733 static void nft_chain_stats_replace(struct nft_trans *trans)
1735 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1737 if (!nft_trans_chain_stats(trans))
1740 nft_trans_chain_stats(trans) =
1741 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1742 lockdep_commit_lock_is_held(trans->ctx.net));
1744 if (!nft_trans_chain_stats(trans))
1745 static_branch_inc(&nft_counters_enabled);
1748 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1750 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1751 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1757 /* should be NULL either via abort or via successful commit */
1758 WARN_ON_ONCE(chain->rules_next);
1759 kvfree(chain->rules_next);
1762 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1764 struct nft_chain *chain = ctx->chain;
1765 struct nft_hook *hook, *next;
1767 if (WARN_ON(chain->use > 0))
1770 /* no concurrent access possible anymore */
1771 nf_tables_chain_free_chain_rules(chain);
1773 if (nft_is_base_chain(chain)) {
1774 struct nft_base_chain *basechain = nft_base_chain(chain);
1776 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1777 list_for_each_entry_safe(hook, next,
1778 &basechain->hook_list, list) {
1779 list_del_rcu(&hook->list);
1780 kfree_rcu(hook, rcu);
1783 module_put(basechain->type->owner);
1784 if (rcu_access_pointer(basechain->stats)) {
1785 static_branch_dec(&nft_counters_enabled);
1786 free_percpu(rcu_dereference_raw(basechain->stats));
1789 kfree(chain->udata);
1793 kfree(chain->udata);
1798 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1799 const struct nlattr *attr)
1801 struct net_device *dev;
1802 char ifname[IFNAMSIZ];
1803 struct nft_hook *hook;
1806 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1809 goto err_hook_alloc;
1812 nla_strscpy(ifname, attr, IFNAMSIZ);
1813 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1814 * indirectly serializing all the other holders of the commit_mutex with
1817 dev = __dev_get_by_name(net, ifname);
1822 hook->ops.dev = dev;
1823 hook->inactive = false;
1830 return ERR_PTR(err);
1833 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1834 const struct nft_hook *this)
1836 struct nft_hook *hook;
1838 list_for_each_entry(hook, hook_list, list) {
1839 if (this->ops.dev == hook->ops.dev)
1846 static int nf_tables_parse_netdev_hooks(struct net *net,
1847 const struct nlattr *attr,
1848 struct list_head *hook_list)
1850 struct nft_hook *hook, *next;
1851 const struct nlattr *tmp;
1852 int rem, n = 0, err;
1854 nla_for_each_nested(tmp, attr, rem) {
1855 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1860 hook = nft_netdev_hook_alloc(net, tmp);
1862 err = PTR_ERR(hook);
1865 if (nft_hook_list_find(hook_list, hook)) {
1870 list_add_tail(&hook->list, hook_list);
1873 if (n == NFT_NETDEVICE_MAX) {
1882 list_for_each_entry_safe(hook, next, hook_list, list) {
1883 list_del(&hook->list);
1889 struct nft_chain_hook {
1892 const struct nft_chain_type *type;
1893 struct list_head list;
1896 static int nft_chain_parse_netdev(struct net *net,
1897 struct nlattr *tb[],
1898 struct list_head *hook_list)
1900 struct nft_hook *hook;
1903 if (tb[NFTA_HOOK_DEV]) {
1904 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1906 return PTR_ERR(hook);
1908 list_add_tail(&hook->list, hook_list);
1909 } else if (tb[NFTA_HOOK_DEVS]) {
1910 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1915 if (list_empty(hook_list))
1924 static int nft_chain_parse_hook(struct net *net,
1925 const struct nlattr * const nla[],
1926 struct nft_chain_hook *hook, u8 family,
1927 struct netlink_ext_ack *extack, bool autoload)
1929 struct nftables_pernet *nft_net = nft_pernet(net);
1930 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1931 const struct nft_chain_type *type;
1934 lockdep_assert_held(&nft_net->commit_mutex);
1935 lockdep_nfnl_nft_mutex_not_held();
1937 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1938 nla[NFTA_CHAIN_HOOK],
1939 nft_hook_policy, NULL);
1943 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1944 ha[NFTA_HOOK_PRIORITY] == NULL)
1947 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1948 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1950 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1954 if (nla[NFTA_CHAIN_TYPE]) {
1955 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1958 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1959 return PTR_ERR(type);
1962 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1965 if (type->type == NFT_CHAIN_T_NAT &&
1966 hook->priority <= NF_IP_PRI_CONNTRACK)
1969 if (!try_module_get(type->owner)) {
1970 if (nla[NFTA_CHAIN_TYPE])
1971 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1977 INIT_LIST_HEAD(&hook->list);
1978 if (nft_base_chain_netdev(family, hook->num)) {
1979 err = nft_chain_parse_netdev(net, ha, &hook->list);
1981 module_put(type->owner);
1984 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
1985 module_put(type->owner);
1992 static void nft_chain_release_hook(struct nft_chain_hook *hook)
1994 struct nft_hook *h, *next;
1996 list_for_each_entry_safe(h, next, &hook->list, list) {
2000 module_put(hook->type->owner);
2003 struct nft_rules_old {
2005 struct nft_rule **start;
2008 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2011 if (alloc > INT_MAX)
2014 alloc += 1; /* NULL, ends rules */
2015 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2018 alloc *= sizeof(struct nft_rule *);
2019 alloc += sizeof(struct nft_rules_old);
2021 return kvmalloc(alloc, GFP_KERNEL);
2024 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2025 const struct nft_chain_hook *hook,
2026 struct nft_chain *chain)
2029 ops->hooknum = hook->num;
2030 ops->priority = hook->priority;
2032 ops->hook = hook->type->hooks[ops->hooknum];
2033 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2036 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2037 struct nft_chain_hook *hook, u32 flags)
2039 struct nft_chain *chain;
2042 basechain->type = hook->type;
2043 INIT_LIST_HEAD(&basechain->hook_list);
2044 chain = &basechain->chain;
2046 if (nft_base_chain_netdev(family, hook->num)) {
2047 list_splice_init(&hook->list, &basechain->hook_list);
2048 list_for_each_entry(h, &basechain->hook_list, list)
2049 nft_basechain_hook_init(&h->ops, family, hook, chain);
2051 basechain->ops.hooknum = hook->num;
2052 basechain->ops.priority = hook->priority;
2054 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2057 chain->flags |= NFT_CHAIN_BASE | flags;
2058 basechain->policy = NF_ACCEPT;
2059 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2060 nft_chain_offload_priority(basechain) < 0)
2063 flow_block_init(&basechain->flow_block);
2068 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2072 err = rhltable_insert_key(&table->chains_ht, chain->name,
2073 &chain->rhlhead, nft_chain_ht_params);
2077 list_add_tail_rcu(&chain->list, &table->chains);
2082 static u64 chain_id;
2084 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2085 u8 policy, u32 flags,
2086 struct netlink_ext_ack *extack)
2088 const struct nlattr * const *nla = ctx->nla;
2089 struct nft_table *table = ctx->table;
2090 struct nft_base_chain *basechain;
2091 struct nft_stats __percpu *stats;
2092 struct net *net = ctx->net;
2093 char name[NFT_NAME_MAXLEN];
2094 struct nft_trans *trans;
2095 struct nft_chain *chain;
2096 struct nft_rule **rules;
2099 if (table->use == UINT_MAX)
2102 if (nla[NFTA_CHAIN_HOOK]) {
2103 struct nft_chain_hook hook;
2105 if (flags & NFT_CHAIN_BINDING)
2108 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2113 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2114 if (basechain == NULL) {
2115 nft_chain_release_hook(&hook);
2118 chain = &basechain->chain;
2120 if (nla[NFTA_CHAIN_COUNTERS]) {
2121 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2122 if (IS_ERR(stats)) {
2123 nft_chain_release_hook(&hook);
2125 return PTR_ERR(stats);
2127 rcu_assign_pointer(basechain->stats, stats);
2128 static_branch_inc(&nft_counters_enabled);
2131 err = nft_basechain_init(basechain, family, &hook, flags);
2133 nft_chain_release_hook(&hook);
2138 if (flags & NFT_CHAIN_BASE)
2140 if (flags & NFT_CHAIN_HW_OFFLOAD)
2143 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2147 chain->flags = flags;
2151 INIT_LIST_HEAD(&chain->rules);
2152 chain->handle = nf_tables_alloc_handle(table);
2153 chain->table = table;
2155 if (nla[NFTA_CHAIN_NAME]) {
2156 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2158 if (!(flags & NFT_CHAIN_BINDING)) {
2160 goto err_destroy_chain;
2163 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2164 chain->name = kstrdup(name, GFP_KERNEL);
2169 goto err_destroy_chain;
2172 if (nla[NFTA_CHAIN_USERDATA]) {
2173 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2174 if (chain->udata == NULL) {
2176 goto err_destroy_chain;
2178 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2181 rules = nf_tables_chain_alloc_rules(chain, 0);
2184 goto err_destroy_chain;
2188 rcu_assign_pointer(chain->rules_gen_0, rules);
2189 rcu_assign_pointer(chain->rules_gen_1, rules);
2191 err = nf_tables_register_hook(net, table, chain);
2193 goto err_destroy_chain;
2195 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2196 if (IS_ERR(trans)) {
2197 err = PTR_ERR(trans);
2198 goto err_unregister_hook;
2201 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2202 if (nft_is_base_chain(chain))
2203 nft_trans_chain_policy(trans) = policy;
2205 err = nft_chain_add(table, chain);
2207 nft_trans_destroy(trans);
2208 goto err_unregister_hook;
2214 err_unregister_hook:
2215 nf_tables_unregister_hook(net, table, chain);
2217 nf_tables_chain_destroy(ctx);
2222 static bool nft_hook_list_equal(struct list_head *hook_list1,
2223 struct list_head *hook_list2)
2225 struct nft_hook *hook;
2229 list_for_each_entry(hook, hook_list2, list) {
2230 if (!nft_hook_list_find(hook_list1, hook))
2235 list_for_each_entry(hook, hook_list1, list)
2241 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2242 u32 flags, const struct nlattr *attr,
2243 struct netlink_ext_ack *extack)
2245 const struct nlattr * const *nla = ctx->nla;
2246 struct nft_table *table = ctx->table;
2247 struct nft_chain *chain = ctx->chain;
2248 struct nft_base_chain *basechain;
2249 struct nft_stats *stats = NULL;
2250 struct nft_chain_hook hook;
2251 struct nf_hook_ops *ops;
2252 struct nft_trans *trans;
2255 if (chain->flags ^ flags)
2258 if (nla[NFTA_CHAIN_HOOK]) {
2259 if (!nft_is_base_chain(chain)) {
2260 NL_SET_BAD_ATTR(extack, attr);
2263 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2268 basechain = nft_base_chain(chain);
2269 if (basechain->type != hook.type) {
2270 nft_chain_release_hook(&hook);
2271 NL_SET_BAD_ATTR(extack, attr);
2275 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2276 if (!nft_hook_list_equal(&basechain->hook_list,
2278 nft_chain_release_hook(&hook);
2279 NL_SET_BAD_ATTR(extack, attr);
2283 ops = &basechain->ops;
2284 if (ops->hooknum != hook.num ||
2285 ops->priority != hook.priority) {
2286 nft_chain_release_hook(&hook);
2287 NL_SET_BAD_ATTR(extack, attr);
2291 nft_chain_release_hook(&hook);
2294 if (nla[NFTA_CHAIN_HANDLE] &&
2295 nla[NFTA_CHAIN_NAME]) {
2296 struct nft_chain *chain2;
2298 chain2 = nft_chain_lookup(ctx->net, table,
2299 nla[NFTA_CHAIN_NAME], genmask);
2300 if (!IS_ERR(chain2)) {
2301 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2306 if (nla[NFTA_CHAIN_COUNTERS]) {
2307 if (!nft_is_base_chain(chain))
2310 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2312 return PTR_ERR(stats);
2316 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2317 sizeof(struct nft_trans_chain));
2321 nft_trans_chain_stats(trans) = stats;
2322 nft_trans_chain_update(trans) = true;
2324 if (nla[NFTA_CHAIN_POLICY])
2325 nft_trans_chain_policy(trans) = policy;
2327 nft_trans_chain_policy(trans) = -1;
2329 if (nla[NFTA_CHAIN_HANDLE] &&
2330 nla[NFTA_CHAIN_NAME]) {
2331 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2332 struct nft_trans *tmp;
2336 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2341 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2342 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2343 tmp->ctx.table == table &&
2344 nft_trans_chain_update(tmp) &&
2345 nft_trans_chain_name(tmp) &&
2346 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2347 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2353 nft_trans_chain_name(trans) = name;
2355 nft_trans_commit_list_add_tail(ctx->net, trans);
2364 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2365 const struct nlattr *nla)
2367 struct nftables_pernet *nft_net = nft_pernet(net);
2368 u32 id = ntohl(nla_get_be32(nla));
2369 struct nft_trans *trans;
2371 list_for_each_entry(trans, &nft_net->commit_list, list) {
2372 struct nft_chain *chain = trans->ctx.chain;
2374 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2375 id == nft_trans_chain_id(trans))
2378 return ERR_PTR(-ENOENT);
2381 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2382 const struct nlattr * const nla[])
2384 struct nftables_pernet *nft_net = nft_pernet(info->net);
2385 struct netlink_ext_ack *extack = info->extack;
2386 u8 genmask = nft_genmask_next(info->net);
2387 u8 family = info->nfmsg->nfgen_family;
2388 struct nft_chain *chain = NULL;
2389 struct net *net = info->net;
2390 const struct nlattr *attr;
2391 struct nft_table *table;
2392 u8 policy = NF_ACCEPT;
2397 lockdep_assert_held(&nft_net->commit_mutex);
2399 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2400 NETLINK_CB(skb).portid);
2401 if (IS_ERR(table)) {
2402 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2403 return PTR_ERR(table);
2407 attr = nla[NFTA_CHAIN_NAME];
2409 if (nla[NFTA_CHAIN_HANDLE]) {
2410 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2411 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2412 if (IS_ERR(chain)) {
2413 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2414 return PTR_ERR(chain);
2416 attr = nla[NFTA_CHAIN_HANDLE];
2417 } else if (nla[NFTA_CHAIN_NAME]) {
2418 chain = nft_chain_lookup(net, table, attr, genmask);
2419 if (IS_ERR(chain)) {
2420 if (PTR_ERR(chain) != -ENOENT) {
2421 NL_SET_BAD_ATTR(extack, attr);
2422 return PTR_ERR(chain);
2426 } else if (!nla[NFTA_CHAIN_ID]) {
2430 if (nla[NFTA_CHAIN_POLICY]) {
2431 if (chain != NULL &&
2432 !nft_is_base_chain(chain)) {
2433 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2437 if (chain == NULL &&
2438 nla[NFTA_CHAIN_HOOK] == NULL) {
2439 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2443 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2453 if (nla[NFTA_CHAIN_FLAGS])
2454 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2456 flags = chain->flags;
2458 if (flags & ~NFT_CHAIN_FLAGS)
2461 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2463 if (chain != NULL) {
2464 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2465 NL_SET_BAD_ATTR(extack, attr);
2468 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2471 flags |= chain->flags & NFT_CHAIN_BASE;
2472 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2476 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2479 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2480 const struct nlattr * const nla[])
2482 struct netlink_ext_ack *extack = info->extack;
2483 u8 genmask = nft_genmask_next(info->net);
2484 u8 family = info->nfmsg->nfgen_family;
2485 struct net *net = info->net;
2486 const struct nlattr *attr;
2487 struct nft_table *table;
2488 struct nft_chain *chain;
2489 struct nft_rule *rule;
2495 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2496 NETLINK_CB(skb).portid);
2497 if (IS_ERR(table)) {
2498 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2499 return PTR_ERR(table);
2502 if (nla[NFTA_CHAIN_HANDLE]) {
2503 attr = nla[NFTA_CHAIN_HANDLE];
2504 handle = be64_to_cpu(nla_get_be64(attr));
2505 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2507 attr = nla[NFTA_CHAIN_NAME];
2508 chain = nft_chain_lookup(net, table, attr, genmask);
2510 if (IS_ERR(chain)) {
2511 NL_SET_BAD_ATTR(extack, attr);
2512 return PTR_ERR(chain);
2515 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2519 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2522 list_for_each_entry(rule, &chain->rules, list) {
2523 if (!nft_is_active_next(net, rule))
2527 err = nft_delrule(&ctx, rule);
2532 /* There are rules and elements that are still holding references to us,
2533 * we cannot do a recursive removal in this case.
2536 NL_SET_BAD_ATTR(extack, attr);
2540 return nft_delchain(&ctx);
2548 * nft_register_expr - register nf_tables expr type
2551 * Registers the expr type for use with nf_tables. Returns zero on
2552 * success or a negative errno code otherwise.
2554 int nft_register_expr(struct nft_expr_type *type)
2556 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2557 if (type->family == NFPROTO_UNSPEC)
2558 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2560 list_add_rcu(&type->list, &nf_tables_expressions);
2561 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2564 EXPORT_SYMBOL_GPL(nft_register_expr);
2567 * nft_unregister_expr - unregister nf_tables expr type
2570 * Unregisters the expr typefor use with nf_tables.
2572 void nft_unregister_expr(struct nft_expr_type *type)
2574 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2575 list_del_rcu(&type->list);
2576 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2578 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2580 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2583 const struct nft_expr_type *type, *candidate = NULL;
2585 list_for_each_entry(type, &nf_tables_expressions, list) {
2586 if (!nla_strcmp(nla, type->name)) {
2587 if (!type->family && !candidate)
2589 else if (type->family == family)
2596 #ifdef CONFIG_MODULES
2597 static int nft_expr_type_request_module(struct net *net, u8 family,
2600 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2601 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2608 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2612 const struct nft_expr_type *type;
2615 return ERR_PTR(-EINVAL);
2617 type = __nft_expr_type_get(family, nla);
2618 if (type != NULL && try_module_get(type->owner))
2621 lockdep_nfnl_nft_mutex_not_held();
2622 #ifdef CONFIG_MODULES
2624 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2625 return ERR_PTR(-EAGAIN);
2627 if (nft_request_module(net, "nft-expr-%.*s",
2629 (char *)nla_data(nla)) == -EAGAIN)
2630 return ERR_PTR(-EAGAIN);
2633 return ERR_PTR(-ENOENT);
2636 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2637 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2638 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2639 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2642 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2643 const struct nft_expr *expr)
2645 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2646 goto nla_put_failure;
2648 if (expr->ops->dump) {
2649 struct nlattr *data = nla_nest_start_noflag(skb,
2652 goto nla_put_failure;
2653 if (expr->ops->dump(skb, expr) < 0)
2654 goto nla_put_failure;
2655 nla_nest_end(skb, data);
2664 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2665 const struct nft_expr *expr)
2667 struct nlattr *nest;
2669 nest = nla_nest_start_noflag(skb, attr);
2671 goto nla_put_failure;
2672 if (nf_tables_fill_expr_info(skb, expr) < 0)
2673 goto nla_put_failure;
2674 nla_nest_end(skb, nest);
2681 struct nft_expr_info {
2682 const struct nft_expr_ops *ops;
2683 const struct nlattr *attr;
2684 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2687 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2688 const struct nlattr *nla,
2689 struct nft_expr_info *info)
2691 const struct nft_expr_type *type;
2692 const struct nft_expr_ops *ops;
2693 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2696 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2697 nft_expr_policy, NULL);
2701 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2703 return PTR_ERR(type);
2705 if (tb[NFTA_EXPR_DATA]) {
2706 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2708 type->policy, NULL);
2712 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2714 if (type->select_ops != NULL) {
2715 ops = type->select_ops(ctx,
2716 (const struct nlattr * const *)info->tb);
2719 #ifdef CONFIG_MODULES
2721 if (nft_expr_type_request_module(ctx->net,
2723 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2737 module_put(type->owner);
2741 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2742 const struct nft_expr_info *expr_info,
2743 struct nft_expr *expr)
2745 const struct nft_expr_ops *ops = expr_info->ops;
2750 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2761 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2762 struct nft_expr *expr)
2764 const struct nft_expr_type *type = expr->ops->type;
2766 if (expr->ops->destroy)
2767 expr->ops->destroy(ctx, expr);
2768 module_put(type->owner);
2771 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2772 const struct nlattr *nla)
2774 struct nft_expr_info expr_info;
2775 struct nft_expr *expr;
2776 struct module *owner;
2779 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2784 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2788 err = nf_tables_newexpr(ctx, &expr_info, expr);
2796 owner = expr_info.ops->type->owner;
2797 if (expr_info.ops->type->release_ops)
2798 expr_info.ops->type->release_ops(expr_info.ops);
2802 return ERR_PTR(err);
2805 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2809 if (src->ops->clone) {
2810 dst->ops = src->ops;
2811 err = src->ops->clone(dst, src);
2815 memcpy(dst, src, src->ops->size);
2818 __module_get(src->ops->type->owner);
2823 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2825 nf_tables_expr_destroy(ctx, expr);
2833 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2836 struct nft_rule *rule;
2838 // FIXME: this sucks
2839 list_for_each_entry_rcu(rule, &chain->rules, list) {
2840 if (handle == rule->handle)
2844 return ERR_PTR(-ENOENT);
2847 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2848 const struct nlattr *nla)
2851 return ERR_PTR(-EINVAL);
2853 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2856 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2857 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2858 .len = NFT_TABLE_MAXNAMELEN - 1 },
2859 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2860 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2861 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2862 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2863 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2864 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2865 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2866 .len = NFT_USERDATA_MAXLEN },
2867 [NFTA_RULE_ID] = { .type = NLA_U32 },
2868 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2869 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2872 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2873 u32 portid, u32 seq, int event,
2874 u32 flags, int family,
2875 const struct nft_table *table,
2876 const struct nft_chain *chain,
2877 const struct nft_rule *rule, u64 handle)
2879 struct nlmsghdr *nlh;
2880 const struct nft_expr *expr, *next;
2881 struct nlattr *list;
2882 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2884 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2887 goto nla_put_failure;
2889 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2890 goto nla_put_failure;
2891 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2892 goto nla_put_failure;
2893 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2895 goto nla_put_failure;
2897 if (event != NFT_MSG_DELRULE && handle) {
2898 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2900 goto nla_put_failure;
2903 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2904 nft_flow_rule_stats(chain, rule);
2906 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2908 goto nla_put_failure;
2909 nft_rule_for_each_expr(expr, next, rule) {
2910 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2911 goto nla_put_failure;
2913 nla_nest_end(skb, list);
2916 struct nft_userdata *udata = nft_userdata(rule);
2917 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2919 goto nla_put_failure;
2922 nlmsg_end(skb, nlh);
2926 nlmsg_trim(skb, nlh);
2930 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2931 const struct nft_rule *rule, int event)
2933 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2934 const struct nft_rule *prule;
2935 struct sk_buff *skb;
2941 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2944 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2948 if (event == NFT_MSG_NEWRULE &&
2949 !list_is_first(&rule->list, &ctx->chain->rules) &&
2950 !list_is_last(&rule->list, &ctx->chain->rules)) {
2951 prule = list_prev_entry(rule, list);
2952 handle = prule->handle;
2954 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2955 flags |= NLM_F_APPEND;
2956 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2957 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2959 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2960 event, flags, ctx->family, ctx->table,
2961 ctx->chain, rule, handle);
2967 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2970 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
2973 struct nft_rule_dump_ctx {
2978 static int __nf_tables_dump_rules(struct sk_buff *skb,
2980 struct netlink_callback *cb,
2981 const struct nft_table *table,
2982 const struct nft_chain *chain)
2984 struct net *net = sock_net(skb->sk);
2985 const struct nft_rule *rule, *prule;
2986 unsigned int s_idx = cb->args[0];
2990 list_for_each_entry_rcu(rule, &chain->rules, list) {
2991 if (!nft_is_active(net, rule))
2996 memset(&cb->args[1], 0,
2997 sizeof(cb->args) - sizeof(cb->args[0]));
3000 handle = prule->handle;
3004 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3007 NLM_F_MULTI | NLM_F_APPEND,
3009 table, chain, rule, handle) < 0)
3012 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3021 static int nf_tables_dump_rules(struct sk_buff *skb,
3022 struct netlink_callback *cb)
3024 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3025 const struct nft_rule_dump_ctx *ctx = cb->data;
3026 struct nft_table *table;
3027 const struct nft_chain *chain;
3028 unsigned int idx = 0;
3029 struct net *net = sock_net(skb->sk);
3030 int family = nfmsg->nfgen_family;
3031 struct nftables_pernet *nft_net;
3034 nft_net = nft_pernet(net);
3035 cb->seq = nft_net->base_seq;
3037 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3038 if (family != NFPROTO_UNSPEC && family != table->family)
3041 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3044 if (ctx && ctx->table && ctx->chain) {
3045 struct rhlist_head *list, *tmp;
3047 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3048 nft_chain_ht_params);
3052 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3053 if (!nft_is_active(net, chain))
3055 __nf_tables_dump_rules(skb, &idx,
3062 list_for_each_entry_rcu(chain, &table->chains, list) {
3063 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3067 if (ctx && ctx->table)
3077 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3079 const struct nlattr * const *nla = cb->data;
3080 struct nft_rule_dump_ctx *ctx = NULL;
3082 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3083 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3087 if (nla[NFTA_RULE_TABLE]) {
3088 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3095 if (nla[NFTA_RULE_CHAIN]) {
3096 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3110 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3112 struct nft_rule_dump_ctx *ctx = cb->data;
3122 /* called with rcu_read_lock held */
3123 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3124 const struct nlattr * const nla[])
3126 struct netlink_ext_ack *extack = info->extack;
3127 u8 genmask = nft_genmask_cur(info->net);
3128 u8 family = info->nfmsg->nfgen_family;
3129 const struct nft_chain *chain;
3130 const struct nft_rule *rule;
3131 struct net *net = info->net;
3132 struct nft_table *table;
3133 struct sk_buff *skb2;
3136 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3137 struct netlink_dump_control c = {
3138 .start= nf_tables_dump_rules_start,
3139 .dump = nf_tables_dump_rules,
3140 .done = nf_tables_dump_rules_done,
3141 .module = THIS_MODULE,
3142 .data = (void *)nla,
3145 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3148 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3149 if (IS_ERR(table)) {
3150 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3151 return PTR_ERR(table);
3154 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3155 if (IS_ERR(chain)) {
3156 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3157 return PTR_ERR(chain);
3160 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3162 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3163 return PTR_ERR(rule);
3166 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3170 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3171 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3172 family, table, chain, rule, 0);
3174 goto err_fill_rule_info;
3176 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3183 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3184 struct nft_rule *rule)
3186 struct nft_expr *expr, *next;
3189 * Careful: some expressions might not be initialized in case this
3190 * is called on error from nf_tables_newrule().
3192 expr = nft_expr_first(rule);
3193 while (nft_expr_more(rule, expr)) {
3194 next = nft_expr_next(expr);
3195 nf_tables_expr_destroy(ctx, expr);
3201 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3203 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3204 nf_tables_rule_destroy(ctx, rule);
3207 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3209 struct nft_expr *expr, *last;
3210 const struct nft_data *data;
3211 struct nft_rule *rule;
3214 if (ctx->level == NFT_JUMP_STACK_SIZE)
3217 list_for_each_entry(rule, &chain->rules, list) {
3218 if (!nft_is_active_next(ctx->net, rule))
3221 nft_rule_for_each_expr(expr, last, rule) {
3222 if (!expr->ops->validate)
3225 err = expr->ops->validate(ctx, expr, &data);
3233 EXPORT_SYMBOL_GPL(nft_chain_validate);
3235 static int nft_table_validate(struct net *net, const struct nft_table *table)
3237 struct nft_chain *chain;
3238 struct nft_ctx ctx = {
3240 .family = table->family,
3244 list_for_each_entry(chain, &table->chains, list) {
3245 if (!nft_is_base_chain(chain))
3249 err = nft_chain_validate(&ctx, chain);
3257 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3258 const struct nlattr *nla);
3260 #define NFT_RULE_MAXEXPRS 128
3262 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3263 const struct nlattr * const nla[])
3265 struct nftables_pernet *nft_net = nft_pernet(info->net);
3266 struct netlink_ext_ack *extack = info->extack;
3267 unsigned int size, i, n, ulen = 0, usize = 0;
3268 u8 genmask = nft_genmask_next(info->net);
3269 struct nft_rule *rule, *old_rule = NULL;
3270 struct nft_expr_info *expr_info = NULL;
3271 u8 family = info->nfmsg->nfgen_family;
3272 struct nft_flow_rule *flow = NULL;
3273 struct net *net = info->net;
3274 struct nft_userdata *udata;
3275 struct nft_table *table;
3276 struct nft_chain *chain;
3277 struct nft_trans *trans;
3278 u64 handle, pos_handle;
3279 struct nft_expr *expr;
3284 lockdep_assert_held(&nft_net->commit_mutex);
3286 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3287 NETLINK_CB(skb).portid);
3288 if (IS_ERR(table)) {
3289 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3290 return PTR_ERR(table);
3293 if (nla[NFTA_RULE_CHAIN]) {
3294 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3296 if (IS_ERR(chain)) {
3297 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3298 return PTR_ERR(chain);
3300 if (nft_chain_is_bound(chain))
3303 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3304 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3305 if (IS_ERR(chain)) {
3306 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3307 return PTR_ERR(chain);
3313 if (nla[NFTA_RULE_HANDLE]) {
3314 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3315 rule = __nft_rule_lookup(chain, handle);
3317 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3318 return PTR_ERR(rule);
3321 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3322 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3325 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3330 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3331 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3333 handle = nf_tables_alloc_handle(table);
3335 if (chain->use == UINT_MAX)
3338 if (nla[NFTA_RULE_POSITION]) {
3339 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3340 old_rule = __nft_rule_lookup(chain, pos_handle);
3341 if (IS_ERR(old_rule)) {
3342 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3343 return PTR_ERR(old_rule);
3345 } else if (nla[NFTA_RULE_POSITION_ID]) {
3346 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3347 if (IS_ERR(old_rule)) {
3348 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3349 return PTR_ERR(old_rule);
3354 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3358 if (nla[NFTA_RULE_EXPRESSIONS]) {
3359 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3360 sizeof(struct nft_expr_info),
3365 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3367 if (nla_type(tmp) != NFTA_LIST_ELEM)
3368 goto err_release_expr;
3369 if (n == NFT_RULE_MAXEXPRS)
3370 goto err_release_expr;
3371 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3373 NL_SET_BAD_ATTR(extack, tmp);
3374 goto err_release_expr;
3376 size += expr_info[n].ops->size;
3380 /* Check for overflow of dlen field */
3382 if (size >= 1 << 12)
3383 goto err_release_expr;
3385 if (nla[NFTA_RULE_USERDATA]) {
3386 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3388 usize = sizeof(struct nft_userdata) + ulen;
3392 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3394 goto err_release_expr;
3396 nft_activate_next(net, rule);
3398 rule->handle = handle;
3400 rule->udata = ulen ? 1 : 0;
3403 udata = nft_userdata(rule);
3404 udata->len = ulen - 1;
3405 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3408 expr = nft_expr_first(rule);
3409 for (i = 0; i < n; i++) {
3410 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3412 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3413 goto err_release_rule;
3416 if (expr_info[i].ops->validate)
3417 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3419 expr_info[i].ops = NULL;
3420 expr = nft_expr_next(expr);
3423 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3424 flow = nft_flow_rule_create(net, rule);
3426 err = PTR_ERR(flow);
3427 goto err_release_rule;
3431 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3432 err = nft_delrule(&ctx, old_rule);
3434 goto err_destroy_flow_rule;
3436 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3437 if (trans == NULL) {
3439 goto err_destroy_flow_rule;
3441 list_add_tail_rcu(&rule->list, &old_rule->list);
3443 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3446 goto err_destroy_flow_rule;
3449 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3451 list_add_rcu(&rule->list, &old_rule->list);
3453 list_add_tail_rcu(&rule->list, &chain->rules);
3456 list_add_tail_rcu(&rule->list, &old_rule->list);
3458 list_add_rcu(&rule->list, &chain->rules);
3465 nft_trans_flow_rule(trans) = flow;
3467 if (nft_net->validate_state == NFT_VALIDATE_DO)
3468 return nft_table_validate(net, table);
3472 err_destroy_flow_rule:
3474 nft_flow_rule_destroy(flow);
3476 nf_tables_rule_release(&ctx, rule);
3478 for (i = 0; i < n; i++) {
3479 if (expr_info[i].ops) {
3480 module_put(expr_info[i].ops->type->owner);
3481 if (expr_info[i].ops->type->release_ops)
3482 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3490 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3491 const struct nlattr *nla)
3493 struct nftables_pernet *nft_net = nft_pernet(net);
3494 u32 id = ntohl(nla_get_be32(nla));
3495 struct nft_trans *trans;
3497 list_for_each_entry(trans, &nft_net->commit_list, list) {
3498 struct nft_rule *rule = nft_trans_rule(trans);
3500 if (trans->msg_type == NFT_MSG_NEWRULE &&
3501 id == nft_trans_rule_id(trans))
3504 return ERR_PTR(-ENOENT);
3507 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3508 const struct nlattr * const nla[])
3510 struct netlink_ext_ack *extack = info->extack;
3511 u8 genmask = nft_genmask_next(info->net);
3512 u8 family = info->nfmsg->nfgen_family;
3513 struct nft_chain *chain = NULL;
3514 struct net *net = info->net;
3515 struct nft_table *table;
3516 struct nft_rule *rule;
3520 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3521 NETLINK_CB(skb).portid);
3522 if (IS_ERR(table)) {
3523 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3524 return PTR_ERR(table);
3527 if (nla[NFTA_RULE_CHAIN]) {
3528 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3530 if (IS_ERR(chain)) {
3531 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3532 return PTR_ERR(chain);
3534 if (nft_chain_is_bound(chain))
3538 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3541 if (nla[NFTA_RULE_HANDLE]) {
3542 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3544 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3545 return PTR_ERR(rule);
3548 err = nft_delrule(&ctx, rule);
3549 } else if (nla[NFTA_RULE_ID]) {
3550 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3552 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3553 return PTR_ERR(rule);
3556 err = nft_delrule(&ctx, rule);
3558 err = nft_delrule_by_chain(&ctx);
3561 list_for_each_entry(chain, &table->chains, list) {
3562 if (!nft_is_active_next(net, chain))
3566 err = nft_delrule_by_chain(&ctx);
3578 static const struct nft_set_type *nft_set_types[] = {
3579 &nft_set_hash_fast_type,
3581 &nft_set_rhash_type,
3582 &nft_set_bitmap_type,
3583 &nft_set_rbtree_type,
3584 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3585 &nft_set_pipapo_avx2_type,
3587 &nft_set_pipapo_type,
3590 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3591 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3594 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3596 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3600 * Select a set implementation based on the data characteristics and the
3601 * given policy. The total memory use might not be known if no size is
3602 * given, in that case the amount of memory per element is used.
3604 static const struct nft_set_ops *
3605 nft_select_set_ops(const struct nft_ctx *ctx,
3606 const struct nlattr * const nla[],
3607 const struct nft_set_desc *desc,
3608 enum nft_set_policies policy)
3610 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3611 const struct nft_set_ops *ops, *bops;
3612 struct nft_set_estimate est, best;
3613 const struct nft_set_type *type;
3617 lockdep_assert_held(&nft_net->commit_mutex);
3618 lockdep_nfnl_nft_mutex_not_held();
3620 if (nla[NFTA_SET_FLAGS] != NULL)
3621 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3628 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3629 type = nft_set_types[i];
3632 if (!nft_set_ops_candidate(type, flags))
3634 if (!ops->estimate(desc, flags, &est))
3638 case NFT_SET_POL_PERFORMANCE:
3639 if (est.lookup < best.lookup)
3641 if (est.lookup == best.lookup &&
3642 est.space < best.space)
3645 case NFT_SET_POL_MEMORY:
3647 if (est.space < best.space)
3649 if (est.space == best.space &&
3650 est.lookup < best.lookup)
3652 } else if (est.size < best.size || !bops) {
3667 return ERR_PTR(-EOPNOTSUPP);
3670 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3671 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3672 .len = NFT_TABLE_MAXNAMELEN - 1 },
3673 [NFTA_SET_NAME] = { .type = NLA_STRING,
3674 .len = NFT_SET_MAXNAMELEN - 1 },
3675 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3676 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3677 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3678 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3679 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3680 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3681 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3682 [NFTA_SET_ID] = { .type = NLA_U32 },
3683 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3684 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3685 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3686 .len = NFT_USERDATA_MAXLEN },
3687 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3688 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3689 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3690 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3693 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3694 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3695 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3698 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3699 const struct nlattr *nla, u8 genmask)
3701 struct nft_set *set;
3704 return ERR_PTR(-EINVAL);
3706 list_for_each_entry_rcu(set, &table->sets, list) {
3707 if (!nla_strcmp(nla, set->name) &&
3708 nft_active_genmask(set, genmask))
3711 return ERR_PTR(-ENOENT);
3714 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3715 const struct nlattr *nla,
3718 struct nft_set *set;
3720 list_for_each_entry(set, &table->sets, list) {
3721 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3722 nft_active_genmask(set, genmask))
3725 return ERR_PTR(-ENOENT);
3728 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3729 const struct nlattr *nla, u8 genmask)
3731 struct nftables_pernet *nft_net = nft_pernet(net);
3732 u32 id = ntohl(nla_get_be32(nla));
3733 struct nft_trans *trans;
3735 list_for_each_entry(trans, &nft_net->commit_list, list) {
3736 if (trans->msg_type == NFT_MSG_NEWSET) {
3737 struct nft_set *set = nft_trans_set(trans);
3739 if (id == nft_trans_set_id(trans) &&
3740 nft_active_genmask(set, genmask))
3744 return ERR_PTR(-ENOENT);
3747 struct nft_set *nft_set_lookup_global(const struct net *net,
3748 const struct nft_table *table,
3749 const struct nlattr *nla_set_name,
3750 const struct nlattr *nla_set_id,
3753 struct nft_set *set;
3755 set = nft_set_lookup(table, nla_set_name, genmask);
3760 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3764 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3766 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3769 const struct nft_set *i;
3771 unsigned long *inuse;
3772 unsigned int n = 0, min = 0;
3774 p = strchr(name, '%');
3776 if (p[1] != 'd' || strchr(p + 2, '%'))
3779 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3783 list_for_each_entry(i, &ctx->table->sets, list) {
3786 if (!nft_is_active_next(ctx->net, set))
3788 if (!sscanf(i->name, name, &tmp))
3790 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3793 set_bit(tmp - min, inuse);
3796 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3797 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3798 min += BITS_PER_BYTE * PAGE_SIZE;
3799 memset(inuse, 0, PAGE_SIZE);
3802 free_page((unsigned long)inuse);
3805 set->name = kasprintf(GFP_KERNEL, name, min + n);
3809 list_for_each_entry(i, &ctx->table->sets, list) {
3810 if (!nft_is_active_next(ctx->net, i))
3812 if (!strcmp(set->name, i->name)) {
3821 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3823 u64 ms = be64_to_cpu(nla_get_be64(nla));
3824 u64 max = (u64)(~((u64)0));
3826 max = div_u64(max, NSEC_PER_MSEC);
3830 ms *= NSEC_PER_MSEC;
3831 *result = nsecs_to_jiffies64(ms);
3835 __be64 nf_jiffies64_to_msecs(u64 input)
3837 return cpu_to_be64(jiffies64_to_msecs(input));
3840 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3841 const struct nft_set *set)
3843 struct nlattr *concat, *field;
3846 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3850 for (i = 0; i < set->field_count; i++) {
3851 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3855 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3856 htonl(set->field_len[i])))
3859 nla_nest_end(skb, field);
3862 nla_nest_end(skb, concat);
3867 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3868 const struct nft_set *set, u16 event, u16 flags)
3870 struct nlmsghdr *nlh;
3871 u32 portid = ctx->portid;
3872 struct nlattr *nest;
3876 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3877 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3878 NFNETLINK_V0, nft_base_seq(ctx->net));
3880 goto nla_put_failure;
3882 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3883 goto nla_put_failure;
3884 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3885 goto nla_put_failure;
3886 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3888 goto nla_put_failure;
3889 if (set->flags != 0)
3890 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3891 goto nla_put_failure;
3893 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3894 goto nla_put_failure;
3895 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3896 goto nla_put_failure;
3897 if (set->flags & NFT_SET_MAP) {
3898 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3899 goto nla_put_failure;
3900 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3901 goto nla_put_failure;
3903 if (set->flags & NFT_SET_OBJECT &&
3904 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3905 goto nla_put_failure;
3908 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3909 nf_jiffies64_to_msecs(set->timeout),
3911 goto nla_put_failure;
3913 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3914 goto nla_put_failure;
3916 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3917 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3918 goto nla_put_failure;
3922 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3923 goto nla_put_failure;
3925 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3927 goto nla_put_failure;
3929 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3930 goto nla_put_failure;
3932 if (set->field_count > 1 &&
3933 nf_tables_fill_set_concat(skb, set))
3934 goto nla_put_failure;
3936 nla_nest_end(skb, nest);
3938 if (set->num_exprs == 1) {
3939 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3940 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3941 goto nla_put_failure;
3943 nla_nest_end(skb, nest);
3944 } else if (set->num_exprs > 1) {
3945 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3947 goto nla_put_failure;
3949 for (i = 0; i < set->num_exprs; i++) {
3950 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3952 goto nla_put_failure;
3954 nla_nest_end(skb, nest);
3957 nlmsg_end(skb, nlh);
3961 nlmsg_trim(skb, nlh);
3965 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3966 const struct nft_set *set, int event,
3969 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3970 u32 portid = ctx->portid;
3971 struct sk_buff *skb;
3976 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3979 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
3983 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3984 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3986 err = nf_tables_fill_set(skb, ctx, set, event, flags);
3992 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3995 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
3998 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4000 const struct nft_set *set;
4001 unsigned int idx, s_idx = cb->args[0];
4002 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4003 struct net *net = sock_net(skb->sk);
4004 struct nft_ctx *ctx = cb->data, ctx_set;
4005 struct nftables_pernet *nft_net;
4011 nft_net = nft_pernet(net);
4012 cb->seq = nft_net->base_seq;
4014 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4015 if (ctx->family != NFPROTO_UNSPEC &&
4016 ctx->family != table->family)
4019 if (ctx->table && ctx->table != table)
4023 if (cur_table != table)
4029 list_for_each_entry_rcu(set, &table->sets, list) {
4032 if (!nft_is_active(net, set))
4036 ctx_set.table = table;
4037 ctx_set.family = table->family;
4039 if (nf_tables_fill_set(skb, &ctx_set, set,
4043 cb->args[2] = (unsigned long) table;
4046 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4059 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4061 struct nft_ctx *ctx_dump = NULL;
4063 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4064 if (ctx_dump == NULL)
4067 cb->data = ctx_dump;
4071 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4077 /* called with rcu_read_lock held */
4078 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4079 const struct nlattr * const nla[])
4081 struct netlink_ext_ack *extack = info->extack;
4082 u8 genmask = nft_genmask_cur(info->net);
4083 u8 family = info->nfmsg->nfgen_family;
4084 struct nft_table *table = NULL;
4085 struct net *net = info->net;
4086 const struct nft_set *set;
4087 struct sk_buff *skb2;
4091 if (nla[NFTA_SET_TABLE]) {
4092 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4094 if (IS_ERR(table)) {
4095 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4096 return PTR_ERR(table);
4100 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4102 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4103 struct netlink_dump_control c = {
4104 .start = nf_tables_dump_sets_start,
4105 .dump = nf_tables_dump_sets,
4106 .done = nf_tables_dump_sets_done,
4108 .module = THIS_MODULE,
4111 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4114 /* Only accept unspec with dump */
4115 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4116 return -EAFNOSUPPORT;
4117 if (!nla[NFTA_SET_TABLE])
4120 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4122 return PTR_ERR(set);
4124 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4128 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4130 goto err_fill_set_info;
4132 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4139 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4140 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4143 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4144 struct nft_set_desc *desc)
4146 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4150 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4151 nft_concat_policy, NULL);
4155 if (!tb[NFTA_SET_FIELD_LEN])
4158 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4160 if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
4163 desc->field_len[desc->field_count++] = len;
4168 static int nft_set_desc_concat(struct nft_set_desc *desc,
4169 const struct nlattr *nla)
4171 struct nlattr *attr;
4174 nla_for_each_nested(attr, nla, rem) {
4175 if (nla_type(attr) != NFTA_LIST_ELEM)
4178 err = nft_set_desc_concat_parse(attr, desc);
4186 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4187 const struct nlattr *nla)
4189 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4192 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4193 nft_set_desc_policy, NULL);
4197 if (da[NFTA_SET_DESC_SIZE] != NULL)
4198 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4199 if (da[NFTA_SET_DESC_CONCAT])
4200 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4205 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4206 const struct nlattr * const nla[])
4208 u32 ktype, dtype, flags, policy, gc_int, objtype;
4209 struct netlink_ext_ack *extack = info->extack;
4210 u8 genmask = nft_genmask_next(info->net);
4211 u8 family = info->nfmsg->nfgen_family;
4212 const struct nft_set_ops *ops;
4213 struct nft_expr *expr = NULL;
4214 struct net *net = info->net;
4215 struct nft_set_desc desc;
4216 struct nft_table *table;
4217 unsigned char *udata;
4218 struct nft_set *set;
4227 if (nla[NFTA_SET_TABLE] == NULL ||
4228 nla[NFTA_SET_NAME] == NULL ||
4229 nla[NFTA_SET_KEY_LEN] == NULL ||
4230 nla[NFTA_SET_ID] == NULL)
4233 memset(&desc, 0, sizeof(desc));
4235 ktype = NFT_DATA_VALUE;
4236 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4237 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4238 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4242 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4243 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4247 if (nla[NFTA_SET_FLAGS] != NULL) {
4248 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4249 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4250 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4251 NFT_SET_MAP | NFT_SET_EVAL |
4252 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4254 /* Only one of these operations is supported */
4255 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4256 (NFT_SET_MAP | NFT_SET_OBJECT))
4258 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4259 (NFT_SET_EVAL | NFT_SET_OBJECT))
4264 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4265 if (!(flags & NFT_SET_MAP))
4268 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4269 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4270 dtype != NFT_DATA_VERDICT)
4273 if (dtype != NFT_DATA_VERDICT) {
4274 if (nla[NFTA_SET_DATA_LEN] == NULL)
4276 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4277 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4280 desc.dlen = sizeof(struct nft_verdict);
4281 } else if (flags & NFT_SET_MAP)
4284 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4285 if (!(flags & NFT_SET_OBJECT))
4288 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4289 if (objtype == NFT_OBJECT_UNSPEC ||
4290 objtype > NFT_OBJECT_MAX)
4292 } else if (flags & NFT_SET_OBJECT)
4295 objtype = NFT_OBJECT_UNSPEC;
4298 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4299 if (!(flags & NFT_SET_TIMEOUT))
4302 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4307 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4308 if (!(flags & NFT_SET_TIMEOUT))
4310 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4313 policy = NFT_SET_POL_PERFORMANCE;
4314 if (nla[NFTA_SET_POLICY] != NULL)
4315 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4317 if (nla[NFTA_SET_DESC] != NULL) {
4318 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4323 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4326 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4327 NETLINK_CB(skb).portid);
4328 if (IS_ERR(table)) {
4329 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4330 return PTR_ERR(table);
4333 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4335 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4337 if (PTR_ERR(set) != -ENOENT) {
4338 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4339 return PTR_ERR(set);
4342 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4343 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4346 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4352 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4355 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4357 return PTR_ERR(ops);
4360 if (nla[NFTA_SET_USERDATA])
4361 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4364 if (ops->privsize != NULL)
4365 size = ops->privsize(nla, &desc);
4366 alloc_size = sizeof(*set) + size + udlen;
4367 if (alloc_size < size || alloc_size > INT_MAX)
4369 set = kvzalloc(alloc_size, GFP_KERNEL);
4373 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4379 err = nf_tables_set_alloc_name(&ctx, set, name);
4386 udata = set->data + size;
4387 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4390 INIT_LIST_HEAD(&set->bindings);
4391 INIT_LIST_HEAD(&set->catchall_list);
4393 write_pnet(&set->net, net);
4396 set->klen = desc.klen;
4398 set->objtype = objtype;
4399 set->dlen = desc.dlen;
4401 set->size = desc.size;
4402 set->policy = policy;
4405 set->timeout = timeout;
4406 set->gc_int = gc_int;
4408 set->field_count = desc.field_count;
4409 for (i = 0; i < desc.field_count; i++)
4410 set->field_len[i] = desc.field_len[i];
4412 err = ops->init(set, &desc, nla);
4416 if (nla[NFTA_SET_EXPR]) {
4417 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4419 err = PTR_ERR(expr);
4420 goto err_set_expr_alloc;
4422 set->exprs[0] = expr;
4424 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4425 struct nft_expr *expr;
4429 if (!(flags & NFT_SET_EXPR)) {
4431 goto err_set_expr_alloc;
4434 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4435 if (i == NFT_SET_EXPR_MAX) {
4437 goto err_set_expr_alloc;
4439 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4441 goto err_set_expr_alloc;
4443 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4445 err = PTR_ERR(expr);
4446 goto err_set_expr_alloc;
4448 set->exprs[i++] = expr;
4453 set->handle = nf_tables_alloc_handle(table);
4455 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4457 goto err_set_expr_alloc;
4459 list_add_tail_rcu(&set->list, &table->sets);
4464 for (i = 0; i < set->num_exprs; i++)
4465 nft_expr_destroy(&ctx, set->exprs[i]);
4475 struct nft_set_elem_catchall {
4476 struct list_head list;
4477 struct rcu_head rcu;
4481 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4482 struct nft_set *set)
4484 struct nft_set_elem_catchall *catchall;
4486 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4487 list_del_rcu(&catchall->list);
4488 nft_set_elem_destroy(set, catchall->elem, true);
4489 kfree_rcu(catchall);
4493 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4497 if (WARN_ON(set->use > 0))
4500 for (i = 0; i < set->num_exprs; i++)
4501 nft_expr_destroy(ctx, set->exprs[i]);
4503 set->ops->destroy(set);
4504 nft_set_catchall_destroy(ctx, set);
4509 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4510 const struct nlattr * const nla[])
4512 struct netlink_ext_ack *extack = info->extack;
4513 u8 genmask = nft_genmask_next(info->net);
4514 u8 family = info->nfmsg->nfgen_family;
4515 struct net *net = info->net;
4516 const struct nlattr *attr;
4517 struct nft_table *table;
4518 struct nft_set *set;
4521 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4522 return -EAFNOSUPPORT;
4524 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4525 genmask, NETLINK_CB(skb).portid);
4526 if (IS_ERR(table)) {
4527 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4528 return PTR_ERR(table);
4531 if (nla[NFTA_SET_HANDLE]) {
4532 attr = nla[NFTA_SET_HANDLE];
4533 set = nft_set_lookup_byhandle(table, attr, genmask);
4535 attr = nla[NFTA_SET_NAME];
4536 set = nft_set_lookup(table, attr, genmask);
4540 NL_SET_BAD_ATTR(extack, attr);
4541 return PTR_ERR(set);
4544 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4545 atomic_read(&set->nelems) > 0)) {
4546 NL_SET_BAD_ATTR(extack, attr);
4550 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4552 return nft_delset(&ctx, set);
4555 static int nft_validate_register_store(const struct nft_ctx *ctx,
4556 enum nft_registers reg,
4557 const struct nft_data *data,
4558 enum nft_data_types type,
4561 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4562 struct nft_set *set,
4563 struct nft_set_elem *elem)
4565 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4566 enum nft_registers dreg;
4568 dreg = nft_type_to_reg(set->dtype);
4569 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4570 set->dtype == NFT_DATA_VERDICT ?
4571 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4575 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4576 struct nft_set *set,
4577 const struct nft_set_iter *iter,
4578 struct nft_set_elem *elem)
4580 return nft_setelem_data_validate(ctx, set, elem);
4583 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4584 struct nft_set *set)
4586 u8 genmask = nft_genmask_next(ctx->net);
4587 struct nft_set_elem_catchall *catchall;
4588 struct nft_set_elem elem;
4589 struct nft_set_ext *ext;
4592 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4593 ext = nft_set_elem_ext(set, catchall->elem);
4594 if (!nft_set_elem_active(ext, genmask))
4597 elem.priv = catchall->elem;
4598 ret = nft_setelem_data_validate(ctx, set, &elem);
4606 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4607 struct nft_set_binding *binding)
4609 struct nft_set_binding *i;
4610 struct nft_set_iter iter;
4612 if (set->use == UINT_MAX)
4615 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4618 if (binding->flags & NFT_SET_MAP) {
4619 /* If the set is already bound to the same chain all
4620 * jumps are already validated for that chain.
4622 list_for_each_entry(i, &set->bindings, list) {
4623 if (i->flags & NFT_SET_MAP &&
4624 i->chain == binding->chain)
4628 iter.genmask = nft_genmask_next(ctx->net);
4632 iter.fn = nf_tables_bind_check_setelem;
4634 set->ops->walk(ctx, set, &iter);
4636 iter.err = nft_set_catchall_bind_check(ctx, set);
4642 binding->chain = ctx->chain;
4643 list_add_tail_rcu(&binding->list, &set->bindings);
4644 nft_set_trans_bind(ctx, set);
4649 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4651 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4652 struct nft_set_binding *binding, bool event)
4654 list_del_rcu(&binding->list);
4656 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4657 list_del_rcu(&set->list);
4659 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4664 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4665 struct nft_set_binding *binding,
4666 enum nft_trans_phase phase)
4669 case NFT_TRANS_PREPARE:
4672 case NFT_TRANS_ABORT:
4673 case NFT_TRANS_RELEASE:
4677 nf_tables_unbind_set(ctx, set, binding,
4678 phase == NFT_TRANS_COMMIT);
4681 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4683 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4685 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4686 nft_set_destroy(ctx, set);
4688 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4690 const struct nft_set_ext_type nft_set_ext_types[] = {
4691 [NFT_SET_EXT_KEY] = {
4692 .align = __alignof__(u32),
4694 [NFT_SET_EXT_DATA] = {
4695 .align = __alignof__(u32),
4697 [NFT_SET_EXT_EXPRESSIONS] = {
4698 .align = __alignof__(struct nft_set_elem_expr),
4700 [NFT_SET_EXT_OBJREF] = {
4701 .len = sizeof(struct nft_object *),
4702 .align = __alignof__(struct nft_object *),
4704 [NFT_SET_EXT_FLAGS] = {
4706 .align = __alignof__(u8),
4708 [NFT_SET_EXT_TIMEOUT] = {
4710 .align = __alignof__(u64),
4712 [NFT_SET_EXT_EXPIRATION] = {
4714 .align = __alignof__(u64),
4716 [NFT_SET_EXT_USERDATA] = {
4717 .len = sizeof(struct nft_userdata),
4718 .align = __alignof__(struct nft_userdata),
4720 [NFT_SET_EXT_KEY_END] = {
4721 .align = __alignof__(u32),
4729 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4730 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4731 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4732 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4733 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4734 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4735 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4736 .len = NFT_USERDATA_MAXLEN },
4737 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4738 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4739 .len = NFT_OBJ_MAXNAMELEN - 1 },
4740 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4741 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4744 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4745 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4746 .len = NFT_TABLE_MAXNAMELEN - 1 },
4747 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4748 .len = NFT_SET_MAXNAMELEN - 1 },
4749 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4750 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4753 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4754 const struct nft_set *set,
4755 const struct nft_set_ext *ext)
4757 struct nft_set_elem_expr *elem_expr;
4758 u32 size, num_exprs = 0;
4759 struct nft_expr *expr;
4760 struct nlattr *nest;
4762 elem_expr = nft_set_ext_expr(ext);
4763 nft_setelem_expr_foreach(expr, elem_expr, size)
4766 if (num_exprs == 1) {
4767 expr = nft_setelem_expr_at(elem_expr, 0);
4768 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4772 } else if (num_exprs > 1) {
4773 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4775 goto nla_put_failure;
4777 nft_setelem_expr_foreach(expr, elem_expr, size) {
4778 expr = nft_setelem_expr_at(elem_expr, size);
4779 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4780 goto nla_put_failure;
4782 nla_nest_end(skb, nest);
4790 static int nf_tables_fill_setelem(struct sk_buff *skb,
4791 const struct nft_set *set,
4792 const struct nft_set_elem *elem)
4794 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4795 unsigned char *b = skb_tail_pointer(skb);
4796 struct nlattr *nest;
4798 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4800 goto nla_put_failure;
4802 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4803 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4804 NFT_DATA_VALUE, set->klen) < 0)
4805 goto nla_put_failure;
4807 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4808 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4809 NFT_DATA_VALUE, set->klen) < 0)
4810 goto nla_put_failure;
4812 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4813 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4814 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4816 goto nla_put_failure;
4818 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4819 nft_set_elem_expr_dump(skb, set, ext))
4820 goto nla_put_failure;
4822 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4823 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4824 (*nft_set_ext_obj(ext))->key.name) < 0)
4825 goto nla_put_failure;
4827 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4828 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4829 htonl(*nft_set_ext_flags(ext))))
4830 goto nla_put_failure;
4832 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4833 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4834 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4836 goto nla_put_failure;
4838 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4839 u64 expires, now = get_jiffies_64();
4841 expires = *nft_set_ext_expiration(ext);
4842 if (time_before64(now, expires))
4847 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4848 nf_jiffies64_to_msecs(expires),
4850 goto nla_put_failure;
4853 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4854 struct nft_userdata *udata;
4856 udata = nft_set_ext_userdata(ext);
4857 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4858 udata->len + 1, udata->data))
4859 goto nla_put_failure;
4862 nla_nest_end(skb, nest);
4870 struct nft_set_dump_args {
4871 const struct netlink_callback *cb;
4872 struct nft_set_iter iter;
4873 struct sk_buff *skb;
4876 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4877 struct nft_set *set,
4878 const struct nft_set_iter *iter,
4879 struct nft_set_elem *elem)
4881 struct nft_set_dump_args *args;
4883 args = container_of(iter, struct nft_set_dump_args, iter);
4884 return nf_tables_fill_setelem(args->skb, set, elem);
4887 struct nft_set_dump_ctx {
4888 const struct nft_set *set;
4892 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4893 const struct nft_set *set)
4895 struct nft_set_elem_catchall *catchall;
4896 u8 genmask = nft_genmask_cur(net);
4897 struct nft_set_elem elem;
4898 struct nft_set_ext *ext;
4901 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4902 ext = nft_set_elem_ext(set, catchall->elem);
4903 if (!nft_set_elem_active(ext, genmask) ||
4904 nft_set_elem_expired(ext))
4907 elem.priv = catchall->elem;
4908 ret = nf_tables_fill_setelem(skb, set, &elem);
4915 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4917 struct nft_set_dump_ctx *dump_ctx = cb->data;
4918 struct net *net = sock_net(skb->sk);
4919 struct nftables_pernet *nft_net;
4920 struct nft_table *table;
4921 struct nft_set *set;
4922 struct nft_set_dump_args args;
4923 bool set_found = false;
4924 struct nlmsghdr *nlh;
4925 struct nlattr *nest;
4930 nft_net = nft_pernet(net);
4931 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4932 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4933 dump_ctx->ctx.family != table->family)
4936 if (table != dump_ctx->ctx.table)
4939 list_for_each_entry_rcu(set, &table->sets, list) {
4940 if (set == dump_ctx->set) {
4953 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
4954 portid = NETLINK_CB(cb->skb).portid;
4955 seq = cb->nlh->nlmsg_seq;
4957 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
4958 table->family, NFNETLINK_V0, nft_base_seq(net));
4960 goto nla_put_failure;
4962 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
4963 goto nla_put_failure;
4964 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
4965 goto nla_put_failure;
4967 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
4969 goto nla_put_failure;
4973 args.iter.genmask = nft_genmask_cur(net);
4974 args.iter.skip = cb->args[0];
4975 args.iter.count = 0;
4977 args.iter.fn = nf_tables_dump_setelem;
4978 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
4980 if (!args.iter.err && args.iter.count == cb->args[0])
4981 args.iter.err = nft_set_catchall_dump(net, skb, set);
4984 nla_nest_end(skb, nest);
4985 nlmsg_end(skb, nlh);
4987 if (args.iter.err && args.iter.err != -EMSGSIZE)
4988 return args.iter.err;
4989 if (args.iter.count == cb->args[0])
4992 cb->args[0] = args.iter.count;
5000 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5002 struct nft_set_dump_ctx *dump_ctx = cb->data;
5004 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5006 return cb->data ? 0 : -ENOMEM;
5009 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5015 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5016 const struct nft_ctx *ctx, u32 seq,
5017 u32 portid, int event, u16 flags,
5018 const struct nft_set *set,
5019 const struct nft_set_elem *elem)
5021 struct nlmsghdr *nlh;
5022 struct nlattr *nest;
5025 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5026 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5027 NFNETLINK_V0, nft_base_seq(ctx->net));
5029 goto nla_put_failure;
5031 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5032 goto nla_put_failure;
5033 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5034 goto nla_put_failure;
5036 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5038 goto nla_put_failure;
5040 err = nf_tables_fill_setelem(skb, set, elem);
5042 goto nla_put_failure;
5044 nla_nest_end(skb, nest);
5046 nlmsg_end(skb, nlh);
5050 nlmsg_trim(skb, nlh);
5054 static int nft_setelem_parse_flags(const struct nft_set *set,
5055 const struct nlattr *attr, u32 *flags)
5060 *flags = ntohl(nla_get_be32(attr));
5061 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5063 if (!(set->flags & NFT_SET_INTERVAL) &&
5064 *flags & NFT_SET_ELEM_INTERVAL_END)
5070 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5071 struct nft_data *key, struct nlattr *attr)
5073 struct nft_data_desc desc;
5076 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5080 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5081 nft_data_release(key, desc.type);
5088 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5089 struct nft_data_desc *desc,
5090 struct nft_data *data,
5091 struct nlattr *attr)
5095 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5099 if (desc->type != NFT_DATA_VERDICT && desc->len != set->dlen) {
5100 nft_data_release(data, desc->type);
5107 static void *nft_setelem_catchall_get(const struct net *net,
5108 const struct nft_set *set)
5110 struct nft_set_elem_catchall *catchall;
5111 u8 genmask = nft_genmask_cur(net);
5112 struct nft_set_ext *ext;
5115 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5116 ext = nft_set_elem_ext(set, catchall->elem);
5117 if (!nft_set_elem_active(ext, genmask) ||
5118 nft_set_elem_expired(ext))
5121 priv = catchall->elem;
5128 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5129 struct nft_set_elem *elem, u32 flags)
5133 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5134 priv = set->ops->get(ctx->net, set, elem, flags);
5136 return PTR_ERR(priv);
5138 priv = nft_setelem_catchall_get(ctx->net, set);
5147 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5148 const struct nlattr *attr)
5150 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5151 struct nft_set_elem elem;
5152 struct sk_buff *skb;
5156 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5157 nft_set_elem_policy, NULL);
5161 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5165 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5168 if (nla[NFTA_SET_ELEM_KEY]) {
5169 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5170 nla[NFTA_SET_ELEM_KEY]);
5175 if (nla[NFTA_SET_ELEM_KEY_END]) {
5176 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5177 nla[NFTA_SET_ELEM_KEY_END]);
5182 err = nft_setelem_get(ctx, set, &elem, flags);
5187 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5191 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5192 NFT_MSG_NEWSETELEM, 0, set, &elem);
5194 goto err_fill_setelem;
5196 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5203 /* called with rcu_read_lock held */
5204 static int nf_tables_getsetelem(struct sk_buff *skb,
5205 const struct nfnl_info *info,
5206 const struct nlattr * const nla[])
5208 struct netlink_ext_ack *extack = info->extack;
5209 u8 genmask = nft_genmask_cur(info->net);
5210 u8 family = info->nfmsg->nfgen_family;
5211 struct net *net = info->net;
5212 struct nft_table *table;
5213 struct nft_set *set;
5214 struct nlattr *attr;
5218 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5219 genmask, NETLINK_CB(skb).portid);
5220 if (IS_ERR(table)) {
5221 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5222 return PTR_ERR(table);
5225 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5227 return PTR_ERR(set);
5229 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5231 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5232 struct netlink_dump_control c = {
5233 .start = nf_tables_dump_set_start,
5234 .dump = nf_tables_dump_set,
5235 .done = nf_tables_dump_set_done,
5236 .module = THIS_MODULE,
5238 struct nft_set_dump_ctx dump_ctx = {
5244 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5247 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5250 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5251 err = nft_get_set_elem(&ctx, set, attr);
5259 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5260 const struct nft_set *set,
5261 const struct nft_set_elem *elem,
5264 struct nftables_pernet *nft_net;
5265 struct net *net = ctx->net;
5266 u32 portid = ctx->portid;
5267 struct sk_buff *skb;
5271 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5274 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5278 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5279 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5281 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5288 nft_net = nft_pernet(net);
5289 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5292 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5295 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5297 struct nft_set *set)
5299 struct nft_trans *trans;
5301 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5305 nft_trans_elem_set(trans) = set;
5309 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5310 const struct nft_set *set,
5311 const struct nlattr *attr)
5313 struct nft_expr *expr;
5316 expr = nft_expr_init(ctx, attr);
5321 if (!(expr->ops->type->flags & NFT_EXPR_STATEFUL))
5322 goto err_set_elem_expr;
5324 if (expr->ops->type->flags & NFT_EXPR_GC) {
5325 if (set->flags & NFT_SET_TIMEOUT)
5326 goto err_set_elem_expr;
5327 if (!set->ops->gc_init)
5328 goto err_set_elem_expr;
5329 set->ops->gc_init(set);
5335 nft_expr_destroy(ctx, expr);
5336 return ERR_PTR(err);
5339 void *nft_set_elem_init(const struct nft_set *set,
5340 const struct nft_set_ext_tmpl *tmpl,
5341 const u32 *key, const u32 *key_end,
5342 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5344 struct nft_set_ext *ext;
5347 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5351 ext = nft_set_elem_ext(set, elem);
5352 nft_set_ext_init(ext, tmpl);
5354 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5355 memcpy(nft_set_ext_key(ext), key, set->klen);
5356 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5357 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5358 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5359 memcpy(nft_set_ext_data(ext), data, set->dlen);
5360 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5361 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5362 if (expiration == 0)
5363 *nft_set_ext_expiration(ext) += timeout;
5365 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5366 *nft_set_ext_timeout(ext) = timeout;
5371 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5372 struct nft_expr *expr)
5374 if (expr->ops->destroy_clone) {
5375 expr->ops->destroy_clone(ctx, expr);
5376 module_put(expr->ops->type->owner);
5378 nf_tables_expr_destroy(ctx, expr);
5382 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5383 struct nft_set_elem_expr *elem_expr)
5385 struct nft_expr *expr;
5388 nft_setelem_expr_foreach(expr, elem_expr, size)
5389 __nft_set_elem_expr_destroy(ctx, expr);
5392 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5395 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5396 struct nft_ctx ctx = {
5397 .net = read_pnet(&set->net),
5398 .family = set->table->family,
5401 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5402 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5403 nft_data_release(nft_set_ext_data(ext), set->dtype);
5404 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5405 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5407 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5408 (*nft_set_ext_obj(ext))->use--;
5411 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5413 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5414 * with the refcounting from the preparation phase.
5416 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5417 const struct nft_set *set, void *elem)
5419 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5421 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5422 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5427 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5428 struct nft_expr *expr_array[])
5430 struct nft_expr *expr;
5433 for (i = 0; i < set->num_exprs; i++) {
5434 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5438 err = nft_expr_clone(expr, set->exprs[i]);
5440 nft_expr_destroy(ctx, expr);
5443 expr_array[i] = expr;
5449 for (k = i - 1; k >= 0; k--)
5450 nft_expr_destroy(ctx, expr_array[k]);
5455 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5456 const struct nft_set_ext *ext,
5457 struct nft_expr *expr_array[],
5460 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5461 struct nft_expr *expr;
5464 for (i = 0; i < num_exprs; i++) {
5465 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5466 err = nft_expr_clone(expr, expr_array[i]);
5468 goto err_elem_expr_setup;
5470 elem_expr->size += expr_array[i]->ops->size;
5471 nft_expr_destroy(ctx, expr_array[i]);
5472 expr_array[i] = NULL;
5477 err_elem_expr_setup:
5478 for (; i < num_exprs; i++) {
5479 nft_expr_destroy(ctx, expr_array[i]);
5480 expr_array[i] = NULL;
5486 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5487 const struct nft_set *set)
5489 struct nft_set_elem_catchall *catchall;
5490 u8 genmask = nft_genmask_cur(net);
5491 struct nft_set_ext *ext;
5493 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5494 ext = nft_set_elem_ext(set, catchall->elem);
5495 if (nft_set_elem_active(ext, genmask) &&
5496 !nft_set_elem_expired(ext))
5502 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5504 void *nft_set_catchall_gc(const struct nft_set *set)
5506 struct nft_set_elem_catchall *catchall, *next;
5507 struct nft_set_ext *ext;
5510 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5511 ext = nft_set_elem_ext(set, catchall->elem);
5513 if (!nft_set_elem_expired(ext) ||
5514 nft_set_elem_mark_busy(ext))
5517 elem = catchall->elem;
5518 list_del_rcu(&catchall->list);
5519 kfree_rcu(catchall, rcu);
5525 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5527 static int nft_setelem_catchall_insert(const struct net *net,
5528 struct nft_set *set,
5529 const struct nft_set_elem *elem,
5530 struct nft_set_ext **pext)
5532 struct nft_set_elem_catchall *catchall;
5533 u8 genmask = nft_genmask_next(net);
5534 struct nft_set_ext *ext;
5536 list_for_each_entry(catchall, &set->catchall_list, list) {
5537 ext = nft_set_elem_ext(set, catchall->elem);
5538 if (nft_set_elem_active(ext, genmask)) {
5544 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5548 catchall->elem = elem->priv;
5549 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5554 static int nft_setelem_insert(const struct net *net,
5555 struct nft_set *set,
5556 const struct nft_set_elem *elem,
5557 struct nft_set_ext **ext, unsigned int flags)
5561 if (flags & NFT_SET_ELEM_CATCHALL)
5562 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5564 ret = set->ops->insert(net, set, elem, ext);
5569 static bool nft_setelem_is_catchall(const struct nft_set *set,
5570 const struct nft_set_elem *elem)
5572 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5574 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5575 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5581 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5582 struct nft_set_elem *elem)
5584 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5586 if (nft_setelem_is_catchall(set, elem)) {
5587 nft_set_elem_change_active(net, set, ext);
5588 nft_set_elem_clear_busy(ext);
5590 set->ops->activate(net, set, elem);
5594 static int nft_setelem_catchall_deactivate(const struct net *net,
5595 struct nft_set *set,
5596 struct nft_set_elem *elem)
5598 struct nft_set_elem_catchall *catchall;
5599 struct nft_set_ext *ext;
5601 list_for_each_entry(catchall, &set->catchall_list, list) {
5602 ext = nft_set_elem_ext(set, catchall->elem);
5603 if (!nft_is_active(net, ext) ||
5604 nft_set_elem_mark_busy(ext))
5608 elem->priv = catchall->elem;
5609 nft_set_elem_change_active(net, set, ext);
5616 static int __nft_setelem_deactivate(const struct net *net,
5617 struct nft_set *set,
5618 struct nft_set_elem *elem)
5622 priv = set->ops->deactivate(net, set, elem);
5633 static int nft_setelem_deactivate(const struct net *net,
5634 struct nft_set *set,
5635 struct nft_set_elem *elem, u32 flags)
5639 if (flags & NFT_SET_ELEM_CATCHALL)
5640 ret = nft_setelem_catchall_deactivate(net, set, elem);
5642 ret = __nft_setelem_deactivate(net, set, elem);
5647 static void nft_setelem_catchall_remove(const struct net *net,
5648 const struct nft_set *set,
5649 const struct nft_set_elem *elem)
5651 struct nft_set_elem_catchall *catchall, *next;
5653 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5654 if (catchall->elem == elem->priv) {
5655 list_del_rcu(&catchall->list);
5656 kfree_rcu(catchall);
5662 static void nft_setelem_remove(const struct net *net,
5663 const struct nft_set *set,
5664 const struct nft_set_elem *elem)
5666 if (nft_setelem_is_catchall(set, elem))
5667 nft_setelem_catchall_remove(net, set, elem);
5669 set->ops->remove(net, set, elem);
5672 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5673 const struct nlattr *attr, u32 nlmsg_flags)
5675 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5676 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5677 u8 genmask = nft_genmask_next(ctx->net);
5678 u32 flags = 0, size = 0, num_exprs = 0;
5679 struct nft_set_ext_tmpl tmpl;
5680 struct nft_set_ext *ext, *ext2;
5681 struct nft_set_elem elem;
5682 struct nft_set_binding *binding;
5683 struct nft_object *obj = NULL;
5684 struct nft_userdata *udata;
5685 struct nft_data_desc desc;
5686 enum nft_registers dreg;
5687 struct nft_trans *trans;
5693 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5694 nft_set_elem_policy, NULL);
5698 nft_set_ext_prepare(&tmpl);
5700 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5704 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5708 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5710 if (set->flags & NFT_SET_MAP) {
5711 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5712 !(flags & NFT_SET_ELEM_INTERVAL_END))
5715 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5719 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5720 (nla[NFTA_SET_ELEM_DATA] ||
5721 nla[NFTA_SET_ELEM_OBJREF] ||
5722 nla[NFTA_SET_ELEM_TIMEOUT] ||
5723 nla[NFTA_SET_ELEM_EXPIRATION] ||
5724 nla[NFTA_SET_ELEM_USERDATA] ||
5725 nla[NFTA_SET_ELEM_EXPR] ||
5726 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5730 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5731 if (!(set->flags & NFT_SET_TIMEOUT))
5733 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5737 } else if (set->flags & NFT_SET_TIMEOUT) {
5738 timeout = set->timeout;
5742 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5743 if (!(set->flags & NFT_SET_TIMEOUT))
5745 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5751 if (nla[NFTA_SET_ELEM_EXPR]) {
5752 struct nft_expr *expr;
5754 if (set->num_exprs && set->num_exprs != 1)
5757 expr = nft_set_elem_expr_alloc(ctx, set,
5758 nla[NFTA_SET_ELEM_EXPR]);
5760 return PTR_ERR(expr);
5762 expr_array[0] = expr;
5765 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5767 goto err_set_elem_expr;
5769 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5770 struct nft_expr *expr;
5775 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5776 if (i == NFT_SET_EXPR_MAX ||
5777 (set->num_exprs && set->num_exprs == i)) {
5779 goto err_set_elem_expr;
5781 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5783 goto err_set_elem_expr;
5785 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5787 err = PTR_ERR(expr);
5788 goto err_set_elem_expr;
5790 expr_array[i] = expr;
5793 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5795 goto err_set_elem_expr;
5799 if (set->num_exprs && set->num_exprs != i) {
5801 goto err_set_elem_expr;
5803 } else if (set->num_exprs > 0) {
5804 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5806 goto err_set_elem_expr_clone;
5808 num_exprs = set->num_exprs;
5811 if (nla[NFTA_SET_ELEM_KEY]) {
5812 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5813 nla[NFTA_SET_ELEM_KEY]);
5815 goto err_set_elem_expr;
5817 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5820 if (nla[NFTA_SET_ELEM_KEY_END]) {
5821 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5822 nla[NFTA_SET_ELEM_KEY_END]);
5826 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5830 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5831 if (timeout != set->timeout)
5832 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5836 for (i = 0; i < num_exprs; i++)
5837 size += expr_array[i]->ops->size;
5839 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5840 sizeof(struct nft_set_elem_expr) +
5844 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5845 if (!(set->flags & NFT_SET_OBJECT)) {
5847 goto err_parse_key_end;
5849 obj = nft_obj_lookup(ctx->net, ctx->table,
5850 nla[NFTA_SET_ELEM_OBJREF],
5851 set->objtype, genmask);
5854 goto err_parse_key_end;
5856 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5859 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5860 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5861 nla[NFTA_SET_ELEM_DATA]);
5863 goto err_parse_key_end;
5865 dreg = nft_type_to_reg(set->dtype);
5866 list_for_each_entry(binding, &set->bindings, list) {
5867 struct nft_ctx bind_ctx = {
5869 .family = ctx->family,
5870 .table = ctx->table,
5871 .chain = (struct nft_chain *)binding->chain,
5874 if (!(binding->flags & NFT_SET_MAP))
5877 err = nft_validate_register_store(&bind_ctx, dreg,
5879 desc.type, desc.len);
5881 goto err_parse_data;
5883 if (desc.type == NFT_DATA_VERDICT &&
5884 (elem.data.val.verdict.code == NFT_GOTO ||
5885 elem.data.val.verdict.code == NFT_JUMP))
5886 nft_validate_state_update(ctx->net,
5890 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5893 /* The full maximum length of userdata can exceed the maximum
5894 * offset value (U8_MAX) for following extensions, therefor it
5895 * must be the last extension added.
5898 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5899 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5901 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5906 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5907 elem.key_end.val.data, elem.data.val.data,
5908 timeout, expiration, GFP_KERNEL);
5909 if (elem.priv == NULL)
5910 goto err_parse_data;
5912 ext = nft_set_elem_ext(set, elem.priv);
5914 *nft_set_ext_flags(ext) = flags;
5916 udata = nft_set_ext_userdata(ext);
5917 udata->len = ulen - 1;
5918 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
5921 *nft_set_ext_obj(ext) = obj;
5924 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
5928 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
5929 if (trans == NULL) {
5934 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
5936 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
5938 if (err == -EEXIST) {
5939 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
5940 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
5941 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
5942 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
5943 goto err_element_clash;
5944 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5945 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
5946 memcmp(nft_set_ext_data(ext),
5947 nft_set_ext_data(ext2), set->dlen) != 0) ||
5948 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5949 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
5950 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
5951 goto err_element_clash;
5952 else if (!(nlmsg_flags & NLM_F_EXCL))
5954 } else if (err == -ENOTEMPTY) {
5955 /* ENOTEMPTY reports overlapping between this element
5956 * and an existing one.
5960 goto err_element_clash;
5963 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
5964 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
5969 nft_trans_elem(trans) = elem;
5970 nft_trans_commit_list_add_tail(ctx->net, trans);
5974 nft_setelem_remove(ctx->net, set, &elem);
5981 nf_tables_set_elem_destroy(ctx, set, elem.priv);
5983 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5984 nft_data_release(&elem.data.val, desc.type);
5986 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
5988 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
5990 for (i = 0; i < num_exprs && expr_array[i]; i++)
5991 nft_expr_destroy(ctx, expr_array[i]);
5992 err_set_elem_expr_clone:
5996 static int nf_tables_newsetelem(struct sk_buff *skb,
5997 const struct nfnl_info *info,
5998 const struct nlattr * const nla[])
6000 struct nftables_pernet *nft_net = nft_pernet(info->net);
6001 struct netlink_ext_ack *extack = info->extack;
6002 u8 genmask = nft_genmask_next(info->net);
6003 u8 family = info->nfmsg->nfgen_family;
6004 struct net *net = info->net;
6005 const struct nlattr *attr;
6006 struct nft_table *table;
6007 struct nft_set *set;
6011 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6014 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6015 genmask, NETLINK_CB(skb).portid);
6016 if (IS_ERR(table)) {
6017 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6018 return PTR_ERR(table);
6021 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6022 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6024 return PTR_ERR(set);
6026 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6029 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6031 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6032 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6037 if (nft_net->validate_state == NFT_VALIDATE_DO)
6038 return nft_table_validate(net, table);
6044 * nft_data_hold - hold a nft_data item
6046 * @data: struct nft_data to release
6047 * @type: type of data
6049 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6050 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6051 * NFT_GOTO verdicts. This function must be called on active data objects
6052 * from the second phase of the commit protocol.
6054 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6056 struct nft_chain *chain;
6057 struct nft_rule *rule;
6059 if (type == NFT_DATA_VERDICT) {
6060 switch (data->verdict.code) {
6063 chain = data->verdict.chain;
6066 if (!nft_chain_is_bound(chain))
6069 chain->table->use++;
6070 list_for_each_entry(rule, &chain->rules, list)
6073 nft_chain_add(chain->table, chain);
6079 static void nft_setelem_data_activate(const struct net *net,
6080 const struct nft_set *set,
6081 struct nft_set_elem *elem)
6083 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6085 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6086 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6087 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6088 (*nft_set_ext_obj(ext))->use++;
6091 static void nft_setelem_data_deactivate(const struct net *net,
6092 const struct nft_set *set,
6093 struct nft_set_elem *elem)
6095 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6097 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6098 nft_data_release(nft_set_ext_data(ext), set->dtype);
6099 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6100 (*nft_set_ext_obj(ext))->use--;
6103 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6104 const struct nlattr *attr)
6106 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6107 struct nft_set_ext_tmpl tmpl;
6108 struct nft_set_elem elem;
6109 struct nft_set_ext *ext;
6110 struct nft_trans *trans;
6114 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6115 nft_set_elem_policy, NULL);
6119 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6123 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6126 nft_set_ext_prepare(&tmpl);
6129 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6131 if (nla[NFTA_SET_ELEM_KEY]) {
6132 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6133 nla[NFTA_SET_ELEM_KEY]);
6137 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6140 if (nla[NFTA_SET_ELEM_KEY_END]) {
6141 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6142 nla[NFTA_SET_ELEM_KEY_END]);
6146 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6150 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6151 elem.key_end.val.data, NULL, 0, 0,
6153 if (elem.priv == NULL)
6156 ext = nft_set_elem_ext(set, elem.priv);
6158 *nft_set_ext_flags(ext) = flags;
6160 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6164 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6168 nft_setelem_data_deactivate(ctx->net, set, &elem);
6170 nft_trans_elem(trans) = elem;
6171 nft_trans_commit_list_add_tail(ctx->net, trans);
6179 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6183 static int nft_setelem_flush(const struct nft_ctx *ctx,
6184 struct nft_set *set,
6185 const struct nft_set_iter *iter,
6186 struct nft_set_elem *elem)
6188 struct nft_trans *trans;
6191 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6192 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6196 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6202 nft_setelem_data_deactivate(ctx->net, set, elem);
6203 nft_trans_elem_set(trans) = set;
6204 nft_trans_elem(trans) = *elem;
6205 nft_trans_commit_list_add_tail(ctx->net, trans);
6213 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6214 struct nft_set *set,
6215 struct nft_set_elem *elem)
6217 struct nft_trans *trans;
6219 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6220 sizeof(struct nft_trans_elem), GFP_KERNEL);
6224 nft_setelem_data_deactivate(ctx->net, set, elem);
6225 nft_trans_elem_set(trans) = set;
6226 nft_trans_elem(trans) = *elem;
6227 nft_trans_commit_list_add_tail(ctx->net, trans);
6232 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6233 struct nft_set *set)
6235 u8 genmask = nft_genmask_next(ctx->net);
6236 struct nft_set_elem_catchall *catchall;
6237 struct nft_set_elem elem;
6238 struct nft_set_ext *ext;
6241 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6242 ext = nft_set_elem_ext(set, catchall->elem);
6243 if (!nft_set_elem_active(ext, genmask) ||
6244 nft_set_elem_mark_busy(ext))
6247 elem.priv = catchall->elem;
6248 ret = __nft_set_catchall_flush(ctx, set, &elem);
6256 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6258 struct nft_set_iter iter = {
6260 .fn = nft_setelem_flush,
6263 set->ops->walk(ctx, set, &iter);
6265 iter.err = nft_set_catchall_flush(ctx, set);
6270 static int nf_tables_delsetelem(struct sk_buff *skb,
6271 const struct nfnl_info *info,
6272 const struct nlattr * const nla[])
6274 struct netlink_ext_ack *extack = info->extack;
6275 u8 genmask = nft_genmask_next(info->net);
6276 u8 family = info->nfmsg->nfgen_family;
6277 struct net *net = info->net;
6278 const struct nlattr *attr;
6279 struct nft_table *table;
6280 struct nft_set *set;
6284 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6285 genmask, NETLINK_CB(skb).portid);
6286 if (IS_ERR(table)) {
6287 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6288 return PTR_ERR(table);
6291 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6293 return PTR_ERR(set);
6294 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6297 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6299 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6300 return nft_set_flush(&ctx, set, genmask);
6302 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6303 err = nft_del_setelem(&ctx, set, attr);
6310 void nft_set_gc_batch_release(struct rcu_head *rcu)
6312 struct nft_set_gc_batch *gcb;
6315 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6316 for (i = 0; i < gcb->head.cnt; i++)
6317 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6321 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6324 struct nft_set_gc_batch *gcb;
6326 gcb = kzalloc(sizeof(*gcb), gfp);
6329 gcb->head.set = set;
6338 * nft_register_obj- register nf_tables stateful object type
6339 * @obj_type: object type
6341 * Registers the object type for use with nf_tables. Returns zero on
6342 * success or a negative errno code otherwise.
6344 int nft_register_obj(struct nft_object_type *obj_type)
6346 if (obj_type->type == NFT_OBJECT_UNSPEC)
6349 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6350 list_add_rcu(&obj_type->list, &nf_tables_objects);
6351 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6354 EXPORT_SYMBOL_GPL(nft_register_obj);
6357 * nft_unregister_obj - unregister nf_tables object type
6358 * @obj_type: object type
6360 * Unregisters the object type for use with nf_tables.
6362 void nft_unregister_obj(struct nft_object_type *obj_type)
6364 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6365 list_del_rcu(&obj_type->list);
6366 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6368 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6370 struct nft_object *nft_obj_lookup(const struct net *net,
6371 const struct nft_table *table,
6372 const struct nlattr *nla, u32 objtype,
6375 struct nft_object_hash_key k = { .table = table };
6376 char search[NFT_OBJ_MAXNAMELEN];
6377 struct rhlist_head *tmp, *list;
6378 struct nft_object *obj;
6380 nla_strscpy(search, nla, sizeof(search));
6383 WARN_ON_ONCE(!rcu_read_lock_held() &&
6384 !lockdep_commit_lock_is_held(net));
6387 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6391 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6392 if (objtype == obj->ops->type->type &&
6393 nft_active_genmask(obj, genmask)) {
6400 return ERR_PTR(-ENOENT);
6402 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6404 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6405 const struct nlattr *nla,
6406 u32 objtype, u8 genmask)
6408 struct nft_object *obj;
6410 list_for_each_entry(obj, &table->objects, list) {
6411 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6412 objtype == obj->ops->type->type &&
6413 nft_active_genmask(obj, genmask))
6416 return ERR_PTR(-ENOENT);
6419 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6420 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6421 .len = NFT_TABLE_MAXNAMELEN - 1 },
6422 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6423 .len = NFT_OBJ_MAXNAMELEN - 1 },
6424 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6425 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6426 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6427 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6428 .len = NFT_USERDATA_MAXLEN },
6431 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6432 const struct nft_object_type *type,
6433 const struct nlattr *attr)
6436 const struct nft_object_ops *ops;
6437 struct nft_object *obj;
6440 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6445 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6446 type->policy, NULL);
6450 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6453 if (type->select_ops) {
6454 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6464 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6468 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6481 return ERR_PTR(err);
6484 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6485 struct nft_object *obj, bool reset)
6487 struct nlattr *nest;
6489 nest = nla_nest_start_noflag(skb, attr);
6491 goto nla_put_failure;
6492 if (obj->ops->dump(skb, obj, reset) < 0)
6493 goto nla_put_failure;
6494 nla_nest_end(skb, nest);
6501 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6503 const struct nft_object_type *type;
6505 list_for_each_entry(type, &nf_tables_objects, list) {
6506 if (objtype == type->type)
6512 static const struct nft_object_type *
6513 nft_obj_type_get(struct net *net, u32 objtype)
6515 const struct nft_object_type *type;
6517 type = __nft_obj_type_get(objtype);
6518 if (type != NULL && try_module_get(type->owner))
6521 lockdep_nfnl_nft_mutex_not_held();
6522 #ifdef CONFIG_MODULES
6524 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6525 return ERR_PTR(-EAGAIN);
6528 return ERR_PTR(-ENOENT);
6531 static int nf_tables_updobj(const struct nft_ctx *ctx,
6532 const struct nft_object_type *type,
6533 const struct nlattr *attr,
6534 struct nft_object *obj)
6536 struct nft_object *newobj;
6537 struct nft_trans *trans;
6540 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6541 sizeof(struct nft_trans_obj));
6545 newobj = nft_obj_init(ctx, type, attr);
6546 if (IS_ERR(newobj)) {
6547 err = PTR_ERR(newobj);
6548 goto err_free_trans;
6551 nft_trans_obj(trans) = obj;
6552 nft_trans_obj_update(trans) = true;
6553 nft_trans_obj_newobj(trans) = newobj;
6554 nft_trans_commit_list_add_tail(ctx->net, trans);
6563 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6564 const struct nlattr * const nla[])
6566 struct netlink_ext_ack *extack = info->extack;
6567 u8 genmask = nft_genmask_next(info->net);
6568 u8 family = info->nfmsg->nfgen_family;
6569 const struct nft_object_type *type;
6570 struct net *net = info->net;
6571 struct nft_table *table;
6572 struct nft_object *obj;
6577 if (!nla[NFTA_OBJ_TYPE] ||
6578 !nla[NFTA_OBJ_NAME] ||
6579 !nla[NFTA_OBJ_DATA])
6582 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6583 NETLINK_CB(skb).portid);
6584 if (IS_ERR(table)) {
6585 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6586 return PTR_ERR(table);
6589 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6590 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6593 if (err != -ENOENT) {
6594 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6598 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6599 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6602 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6605 type = __nft_obj_type_get(objtype);
6606 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6608 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6611 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6613 type = nft_obj_type_get(net, objtype);
6615 return PTR_ERR(type);
6617 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6622 obj->key.table = table;
6623 obj->handle = nf_tables_alloc_handle(table);
6625 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6626 if (!obj->key.name) {
6631 if (nla[NFTA_OBJ_USERDATA]) {
6632 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6633 if (obj->udata == NULL)
6636 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6639 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6643 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6644 nft_objname_ht_params);
6648 list_add_tail_rcu(&obj->list, &table->objects);
6652 /* queued in transaction log */
6653 INIT_LIST_HEAD(&obj->list);
6658 kfree(obj->key.name);
6660 if (obj->ops->destroy)
6661 obj->ops->destroy(&ctx, obj);
6664 module_put(type->owner);
6668 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6669 u32 portid, u32 seq, int event, u32 flags,
6670 int family, const struct nft_table *table,
6671 struct nft_object *obj, bool reset)
6673 struct nlmsghdr *nlh;
6675 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6676 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6677 NFNETLINK_V0, nft_base_seq(net));
6679 goto nla_put_failure;
6681 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6682 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6683 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6684 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6685 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6686 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6688 goto nla_put_failure;
6691 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6692 goto nla_put_failure;
6694 nlmsg_end(skb, nlh);
6698 nlmsg_trim(skb, nlh);
6702 struct nft_obj_filter {
6707 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6709 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6710 const struct nft_table *table;
6711 unsigned int idx = 0, s_idx = cb->args[0];
6712 struct nft_obj_filter *filter = cb->data;
6713 struct net *net = sock_net(skb->sk);
6714 int family = nfmsg->nfgen_family;
6715 struct nftables_pernet *nft_net;
6716 struct nft_object *obj;
6719 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6723 nft_net = nft_pernet(net);
6724 cb->seq = nft_net->base_seq;
6726 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6727 if (family != NFPROTO_UNSPEC && family != table->family)
6730 list_for_each_entry_rcu(obj, &table->objects, list) {
6731 if (!nft_is_active(net, obj))
6736 memset(&cb->args[1], 0,
6737 sizeof(cb->args) - sizeof(cb->args[0]));
6738 if (filter && filter->table &&
6739 strcmp(filter->table, table->name))
6742 filter->type != NFT_OBJECT_UNSPEC &&
6743 obj->ops->type->type != filter->type)
6746 char *buf = kasprintf(GFP_ATOMIC,
6751 audit_log_nfcfg(buf,
6754 AUDIT_NFT_OP_OBJ_RESET,
6759 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6762 NLM_F_MULTI | NLM_F_APPEND,
6763 table->family, table,
6767 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6779 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6781 const struct nlattr * const *nla = cb->data;
6782 struct nft_obj_filter *filter = NULL;
6784 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6785 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6789 if (nla[NFTA_OBJ_TABLE]) {
6790 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6791 if (!filter->table) {
6797 if (nla[NFTA_OBJ_TYPE])
6798 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6805 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6807 struct nft_obj_filter *filter = cb->data;
6810 kfree(filter->table);
6817 /* called with rcu_read_lock held */
6818 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6819 const struct nlattr * const nla[])
6821 struct netlink_ext_ack *extack = info->extack;
6822 u8 genmask = nft_genmask_cur(info->net);
6823 u8 family = info->nfmsg->nfgen_family;
6824 const struct nft_table *table;
6825 struct net *net = info->net;
6826 struct nft_object *obj;
6827 struct sk_buff *skb2;
6832 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6833 struct netlink_dump_control c = {
6834 .start = nf_tables_dump_obj_start,
6835 .dump = nf_tables_dump_obj,
6836 .done = nf_tables_dump_obj_done,
6837 .module = THIS_MODULE,
6838 .data = (void *)nla,
6841 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6844 if (!nla[NFTA_OBJ_NAME] ||
6845 !nla[NFTA_OBJ_TYPE])
6848 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6849 if (IS_ERR(table)) {
6850 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6851 return PTR_ERR(table);
6854 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6855 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6857 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6858 return PTR_ERR(obj);
6861 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6865 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6869 const struct nftables_pernet *nft_net;
6872 nft_net = nft_pernet(net);
6873 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6875 audit_log_nfcfg(buf,
6878 AUDIT_NFT_OP_OBJ_RESET,
6883 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6884 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6885 family, table, obj, reset);
6887 goto err_fill_obj_info;
6889 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
6896 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
6898 if (obj->ops->destroy)
6899 obj->ops->destroy(ctx, obj);
6901 module_put(obj->ops->type->owner);
6902 kfree(obj->key.name);
6907 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
6908 const struct nlattr * const nla[])
6910 struct netlink_ext_ack *extack = info->extack;
6911 u8 genmask = nft_genmask_next(info->net);
6912 u8 family = info->nfmsg->nfgen_family;
6913 struct net *net = info->net;
6914 const struct nlattr *attr;
6915 struct nft_table *table;
6916 struct nft_object *obj;
6920 if (!nla[NFTA_OBJ_TYPE] ||
6921 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
6924 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6925 NETLINK_CB(skb).portid);
6926 if (IS_ERR(table)) {
6927 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6928 return PTR_ERR(table);
6931 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6932 if (nla[NFTA_OBJ_HANDLE]) {
6933 attr = nla[NFTA_OBJ_HANDLE];
6934 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
6936 attr = nla[NFTA_OBJ_NAME];
6937 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
6941 NL_SET_BAD_ATTR(extack, attr);
6942 return PTR_ERR(obj);
6945 NL_SET_BAD_ATTR(extack, attr);
6949 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6951 return nft_delobj(&ctx, obj);
6954 void nft_obj_notify(struct net *net, const struct nft_table *table,
6955 struct nft_object *obj, u32 portid, u32 seq, int event,
6956 u16 flags, int family, int report, gfp_t gfp)
6958 struct nftables_pernet *nft_net = nft_pernet(net);
6959 struct sk_buff *skb;
6961 char *buf = kasprintf(gfp, "%s:%u",
6962 table->name, nft_net->base_seq);
6964 audit_log_nfcfg(buf,
6967 event == NFT_MSG_NEWOBJ ?
6968 AUDIT_NFT_OP_OBJ_REGISTER :
6969 AUDIT_NFT_OP_OBJ_UNREGISTER,
6974 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6977 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
6981 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
6982 flags & (NLM_F_CREATE | NLM_F_EXCL),
6983 family, table, obj, false);
6989 nft_notify_enqueue(skb, report, &nft_net->notify_list);
6992 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6994 EXPORT_SYMBOL_GPL(nft_obj_notify);
6996 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
6997 struct nft_object *obj, int event)
6999 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7000 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7006 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7008 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7009 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7010 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7012 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7014 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7016 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7017 list_del_rcu(&type->list);
7018 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7020 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7022 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7023 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7024 .len = NFT_NAME_MAXLEN - 1 },
7025 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7026 .len = NFT_NAME_MAXLEN - 1 },
7027 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7028 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7029 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7032 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7033 const struct nlattr *nla, u8 genmask)
7035 struct nft_flowtable *flowtable;
7037 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7038 if (!nla_strcmp(nla, flowtable->name) &&
7039 nft_active_genmask(flowtable, genmask))
7042 return ERR_PTR(-ENOENT);
7044 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7046 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7047 struct nft_flowtable *flowtable,
7048 enum nft_trans_phase phase)
7051 case NFT_TRANS_PREPARE:
7052 case NFT_TRANS_ABORT:
7053 case NFT_TRANS_RELEASE:
7060 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7062 static struct nft_flowtable *
7063 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7064 const struct nlattr *nla, u8 genmask)
7066 struct nft_flowtable *flowtable;
7068 list_for_each_entry(flowtable, &table->flowtables, list) {
7069 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7070 nft_active_genmask(flowtable, genmask))
7073 return ERR_PTR(-ENOENT);
7076 struct nft_flowtable_hook {
7079 struct list_head list;
7082 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7083 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7084 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7085 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7088 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7089 const struct nlattr *attr,
7090 struct nft_flowtable_hook *flowtable_hook,
7091 struct nft_flowtable *flowtable, bool add)
7093 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7094 struct nft_hook *hook;
7095 int hooknum, priority;
7098 INIT_LIST_HEAD(&flowtable_hook->list);
7100 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7101 nft_flowtable_hook_policy, NULL);
7106 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7107 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7110 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7111 if (hooknum != NF_NETDEV_INGRESS)
7114 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7116 flowtable_hook->priority = priority;
7117 flowtable_hook->num = hooknum;
7119 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7120 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7121 if (hooknum != flowtable->hooknum)
7125 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7126 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7127 if (priority != flowtable->data.priority)
7131 flowtable_hook->priority = flowtable->data.priority;
7132 flowtable_hook->num = flowtable->hooknum;
7135 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7136 err = nf_tables_parse_netdev_hooks(ctx->net,
7137 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7138 &flowtable_hook->list);
7143 list_for_each_entry(hook, &flowtable_hook->list, list) {
7144 hook->ops.pf = NFPROTO_NETDEV;
7145 hook->ops.hooknum = flowtable_hook->num;
7146 hook->ops.priority = flowtable_hook->priority;
7147 hook->ops.priv = &flowtable->data;
7148 hook->ops.hook = flowtable->data.type->hook;
7154 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7156 const struct nf_flowtable_type *type;
7158 list_for_each_entry(type, &nf_tables_flowtables, list) {
7159 if (family == type->family)
7165 static const struct nf_flowtable_type *
7166 nft_flowtable_type_get(struct net *net, u8 family)
7168 const struct nf_flowtable_type *type;
7170 type = __nft_flowtable_type_get(family);
7171 if (type != NULL && try_module_get(type->owner))
7174 lockdep_nfnl_nft_mutex_not_held();
7175 #ifdef CONFIG_MODULES
7177 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7178 return ERR_PTR(-EAGAIN);
7181 return ERR_PTR(-ENOENT);
7184 /* Only called from error and netdev event paths. */
7185 static void nft_unregister_flowtable_hook(struct net *net,
7186 struct nft_flowtable *flowtable,
7187 struct nft_hook *hook)
7189 nf_unregister_net_hook(net, &hook->ops);
7190 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7194 static void nft_unregister_flowtable_net_hooks(struct net *net,
7195 struct list_head *hook_list)
7197 struct nft_hook *hook;
7199 list_for_each_entry(hook, hook_list, list)
7200 nf_unregister_net_hook(net, &hook->ops);
7203 static int nft_register_flowtable_net_hooks(struct net *net,
7204 struct nft_table *table,
7205 struct list_head *hook_list,
7206 struct nft_flowtable *flowtable)
7208 struct nft_hook *hook, *hook2, *next;
7209 struct nft_flowtable *ft;
7212 list_for_each_entry(hook, hook_list, list) {
7213 list_for_each_entry(ft, &table->flowtables, list) {
7214 if (!nft_is_active_next(net, ft))
7217 list_for_each_entry(hook2, &ft->hook_list, list) {
7218 if (hook->ops.dev == hook2->ops.dev &&
7219 hook->ops.pf == hook2->ops.pf) {
7221 goto err_unregister_net_hooks;
7226 err = flowtable->data.type->setup(&flowtable->data,
7230 goto err_unregister_net_hooks;
7232 err = nf_register_net_hook(net, &hook->ops);
7234 flowtable->data.type->setup(&flowtable->data,
7237 goto err_unregister_net_hooks;
7245 err_unregister_net_hooks:
7246 list_for_each_entry_safe(hook, next, hook_list, list) {
7250 nft_unregister_flowtable_hook(net, flowtable, hook);
7251 list_del_rcu(&hook->list);
7252 kfree_rcu(hook, rcu);
7258 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7260 struct nft_hook *hook, *next;
7262 list_for_each_entry_safe(hook, next, hook_list, list) {
7263 list_del_rcu(&hook->list);
7264 kfree_rcu(hook, rcu);
7268 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7269 struct nft_flowtable *flowtable)
7271 const struct nlattr * const *nla = ctx->nla;
7272 struct nft_flowtable_hook flowtable_hook;
7273 struct nft_hook *hook, *next;
7274 struct nft_trans *trans;
7275 bool unregister = false;
7279 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7280 &flowtable_hook, flowtable, false);
7284 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7285 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7286 list_del(&hook->list);
7291 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7292 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7293 if (flags & ~NFT_FLOWTABLE_MASK)
7295 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7296 (flags & NFT_FLOWTABLE_HW_OFFLOAD))
7299 flags = flowtable->data.flags;
7302 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7303 &flowtable_hook.list, flowtable);
7305 goto err_flowtable_update_hook;
7307 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7308 sizeof(struct nft_trans_flowtable));
7312 goto err_flowtable_update_hook;
7315 nft_trans_flowtable_flags(trans) = flags;
7316 nft_trans_flowtable(trans) = flowtable;
7317 nft_trans_flowtable_update(trans) = true;
7318 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7319 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7321 nft_trans_commit_list_add_tail(ctx->net, trans);
7325 err_flowtable_update_hook:
7326 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7328 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7329 list_del_rcu(&hook->list);
7330 kfree_rcu(hook, rcu);
7337 static int nf_tables_newflowtable(struct sk_buff *skb,
7338 const struct nfnl_info *info,
7339 const struct nlattr * const nla[])
7341 struct netlink_ext_ack *extack = info->extack;
7342 struct nft_flowtable_hook flowtable_hook;
7343 u8 genmask = nft_genmask_next(info->net);
7344 u8 family = info->nfmsg->nfgen_family;
7345 const struct nf_flowtable_type *type;
7346 struct nft_flowtable *flowtable;
7347 struct nft_hook *hook, *next;
7348 struct net *net = info->net;
7349 struct nft_table *table;
7353 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7354 !nla[NFTA_FLOWTABLE_NAME] ||
7355 !nla[NFTA_FLOWTABLE_HOOK])
7358 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7359 genmask, NETLINK_CB(skb).portid);
7360 if (IS_ERR(table)) {
7361 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7362 return PTR_ERR(table);
7365 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7367 if (IS_ERR(flowtable)) {
7368 err = PTR_ERR(flowtable);
7369 if (err != -ENOENT) {
7370 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7374 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7375 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7379 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7381 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7384 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7386 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7390 flowtable->table = table;
7391 flowtable->handle = nf_tables_alloc_handle(table);
7392 INIT_LIST_HEAD(&flowtable->hook_list);
7394 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7395 if (!flowtable->name) {
7400 type = nft_flowtable_type_get(net, family);
7402 err = PTR_ERR(type);
7406 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7407 flowtable->data.flags =
7408 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7409 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7415 write_pnet(&flowtable->data.net, net);
7416 flowtable->data.type = type;
7417 err = type->init(&flowtable->data);
7421 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7422 &flowtable_hook, flowtable, true);
7426 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7427 flowtable->data.priority = flowtable_hook.priority;
7428 flowtable->hooknum = flowtable_hook.num;
7430 err = nft_register_flowtable_net_hooks(ctx.net, table,
7431 &flowtable->hook_list,
7434 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7438 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7442 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7447 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7448 nft_unregister_flowtable_hook(net, flowtable, hook);
7449 list_del_rcu(&hook->list);
7450 kfree_rcu(hook, rcu);
7453 flowtable->data.type->free(&flowtable->data);
7455 module_put(type->owner);
7457 kfree(flowtable->name);
7463 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7465 struct nft_hook *this, *next;
7467 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7468 list_del(&this->list);
7473 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7474 struct nft_flowtable *flowtable)
7476 const struct nlattr * const *nla = ctx->nla;
7477 struct nft_flowtable_hook flowtable_hook;
7478 struct nft_hook *this, *hook;
7479 struct nft_trans *trans;
7482 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7483 &flowtable_hook, flowtable, false);
7487 list_for_each_entry(this, &flowtable_hook.list, list) {
7488 hook = nft_hook_list_find(&flowtable->hook_list, this);
7491 goto err_flowtable_del_hook;
7493 hook->inactive = true;
7496 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7497 sizeof(struct nft_trans_flowtable));
7500 goto err_flowtable_del_hook;
7503 nft_trans_flowtable(trans) = flowtable;
7504 nft_trans_flowtable_update(trans) = true;
7505 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7506 nft_flowtable_hook_release(&flowtable_hook);
7508 nft_trans_commit_list_add_tail(ctx->net, trans);
7512 err_flowtable_del_hook:
7513 list_for_each_entry(this, &flowtable_hook.list, list) {
7514 hook = nft_hook_list_find(&flowtable->hook_list, this);
7518 hook->inactive = false;
7520 nft_flowtable_hook_release(&flowtable_hook);
7525 static int nf_tables_delflowtable(struct sk_buff *skb,
7526 const struct nfnl_info *info,
7527 const struct nlattr * const nla[])
7529 struct netlink_ext_ack *extack = info->extack;
7530 u8 genmask = nft_genmask_next(info->net);
7531 u8 family = info->nfmsg->nfgen_family;
7532 struct nft_flowtable *flowtable;
7533 struct net *net = info->net;
7534 const struct nlattr *attr;
7535 struct nft_table *table;
7538 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7539 (!nla[NFTA_FLOWTABLE_NAME] &&
7540 !nla[NFTA_FLOWTABLE_HANDLE]))
7543 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7544 genmask, NETLINK_CB(skb).portid);
7545 if (IS_ERR(table)) {
7546 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7547 return PTR_ERR(table);
7550 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7551 attr = nla[NFTA_FLOWTABLE_HANDLE];
7552 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7554 attr = nla[NFTA_FLOWTABLE_NAME];
7555 flowtable = nft_flowtable_lookup(table, attr, genmask);
7558 if (IS_ERR(flowtable)) {
7559 NL_SET_BAD_ATTR(extack, attr);
7560 return PTR_ERR(flowtable);
7563 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7565 if (nla[NFTA_FLOWTABLE_HOOK])
7566 return nft_delflowtable_hook(&ctx, flowtable);
7568 if (flowtable->use > 0) {
7569 NL_SET_BAD_ATTR(extack, attr);
7573 return nft_delflowtable(&ctx, flowtable);
7576 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7577 u32 portid, u32 seq, int event,
7578 u32 flags, int family,
7579 struct nft_flowtable *flowtable,
7580 struct list_head *hook_list)
7582 struct nlattr *nest, *nest_devs;
7583 struct nft_hook *hook;
7584 struct nlmsghdr *nlh;
7586 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7587 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7588 NFNETLINK_V0, nft_base_seq(net));
7590 goto nla_put_failure;
7592 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7593 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7594 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7595 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7596 NFTA_FLOWTABLE_PAD) ||
7597 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7598 goto nla_put_failure;
7600 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7602 goto nla_put_failure;
7603 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7604 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7605 goto nla_put_failure;
7607 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7609 goto nla_put_failure;
7611 list_for_each_entry_rcu(hook, hook_list, list) {
7612 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7613 goto nla_put_failure;
7615 nla_nest_end(skb, nest_devs);
7616 nla_nest_end(skb, nest);
7618 nlmsg_end(skb, nlh);
7622 nlmsg_trim(skb, nlh);
7626 struct nft_flowtable_filter {
7630 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7631 struct netlink_callback *cb)
7633 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7634 struct nft_flowtable_filter *filter = cb->data;
7635 unsigned int idx = 0, s_idx = cb->args[0];
7636 struct net *net = sock_net(skb->sk);
7637 int family = nfmsg->nfgen_family;
7638 struct nft_flowtable *flowtable;
7639 struct nftables_pernet *nft_net;
7640 const struct nft_table *table;
7643 nft_net = nft_pernet(net);
7644 cb->seq = nft_net->base_seq;
7646 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7647 if (family != NFPROTO_UNSPEC && family != table->family)
7650 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7651 if (!nft_is_active(net, flowtable))
7656 memset(&cb->args[1], 0,
7657 sizeof(cb->args) - sizeof(cb->args[0]));
7658 if (filter && filter->table &&
7659 strcmp(filter->table, table->name))
7662 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7664 NFT_MSG_NEWFLOWTABLE,
7665 NLM_F_MULTI | NLM_F_APPEND,
7668 &flowtable->hook_list) < 0)
7671 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7683 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7685 const struct nlattr * const *nla = cb->data;
7686 struct nft_flowtable_filter *filter = NULL;
7688 if (nla[NFTA_FLOWTABLE_TABLE]) {
7689 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7693 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7695 if (!filter->table) {
7705 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7707 struct nft_flowtable_filter *filter = cb->data;
7712 kfree(filter->table);
7718 /* called with rcu_read_lock held */
7719 static int nf_tables_getflowtable(struct sk_buff *skb,
7720 const struct nfnl_info *info,
7721 const struct nlattr * const nla[])
7723 u8 genmask = nft_genmask_cur(info->net);
7724 u8 family = info->nfmsg->nfgen_family;
7725 struct nft_flowtable *flowtable;
7726 const struct nft_table *table;
7727 struct net *net = info->net;
7728 struct sk_buff *skb2;
7731 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7732 struct netlink_dump_control c = {
7733 .start = nf_tables_dump_flowtable_start,
7734 .dump = nf_tables_dump_flowtable,
7735 .done = nf_tables_dump_flowtable_done,
7736 .module = THIS_MODULE,
7737 .data = (void *)nla,
7740 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7743 if (!nla[NFTA_FLOWTABLE_NAME])
7746 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7749 return PTR_ERR(table);
7751 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7753 if (IS_ERR(flowtable))
7754 return PTR_ERR(flowtable);
7756 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7760 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7761 info->nlh->nlmsg_seq,
7762 NFT_MSG_NEWFLOWTABLE, 0, family,
7763 flowtable, &flowtable->hook_list);
7765 goto err_fill_flowtable_info;
7767 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7769 err_fill_flowtable_info:
7774 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7775 struct nft_flowtable *flowtable,
7776 struct list_head *hook_list,
7779 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7780 struct sk_buff *skb;
7785 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7788 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7792 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7793 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7795 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7796 ctx->seq, event, flags,
7797 ctx->family, flowtable, hook_list);
7803 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7806 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7809 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7811 struct nft_hook *hook, *next;
7813 flowtable->data.type->free(&flowtable->data);
7814 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7815 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7817 list_del_rcu(&hook->list);
7820 kfree(flowtable->name);
7821 module_put(flowtable->data.type->owner);
7825 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7826 u32 portid, u32 seq)
7828 struct nftables_pernet *nft_net = nft_pernet(net);
7829 struct nlmsghdr *nlh;
7830 char buf[TASK_COMM_LEN];
7831 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7833 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7834 NFNETLINK_V0, nft_base_seq(net));
7836 goto nla_put_failure;
7838 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7839 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7840 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7841 goto nla_put_failure;
7843 nlmsg_end(skb, nlh);
7847 nlmsg_trim(skb, nlh);
7851 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7852 struct nft_flowtable *flowtable)
7854 struct nft_hook *hook;
7856 list_for_each_entry(hook, &flowtable->hook_list, list) {
7857 if (hook->ops.dev != dev)
7860 /* flow_offload_netdev_event() cleans up entries for us. */
7861 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7862 list_del_rcu(&hook->list);
7863 kfree_rcu(hook, rcu);
7868 static int nf_tables_flowtable_event(struct notifier_block *this,
7869 unsigned long event, void *ptr)
7871 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7872 struct nft_flowtable *flowtable;
7873 struct nftables_pernet *nft_net;
7874 struct nft_table *table;
7877 if (event != NETDEV_UNREGISTER)
7881 nft_net = nft_pernet(net);
7882 mutex_lock(&nft_net->commit_mutex);
7883 list_for_each_entry(table, &nft_net->tables, list) {
7884 list_for_each_entry(flowtable, &table->flowtables, list) {
7885 nft_flowtable_event(event, dev, flowtable);
7888 mutex_unlock(&nft_net->commit_mutex);
7893 static struct notifier_block nf_tables_flowtable_notifier = {
7894 .notifier_call = nf_tables_flowtable_event,
7897 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
7900 struct nlmsghdr *nlh = nlmsg_hdr(skb);
7901 struct sk_buff *skb2;
7904 if (!nlmsg_report(nlh) &&
7905 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7908 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7912 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
7919 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7920 nlmsg_report(nlh), GFP_KERNEL);
7923 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
7927 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
7928 const struct nlattr * const nla[])
7930 struct sk_buff *skb2;
7933 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7937 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
7938 info->nlh->nlmsg_seq);
7940 goto err_fill_gen_info;
7942 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
7949 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
7950 [NFT_MSG_NEWTABLE] = {
7951 .call = nf_tables_newtable,
7952 .type = NFNL_CB_BATCH,
7953 .attr_count = NFTA_TABLE_MAX,
7954 .policy = nft_table_policy,
7956 [NFT_MSG_GETTABLE] = {
7957 .call = nf_tables_gettable,
7958 .type = NFNL_CB_RCU,
7959 .attr_count = NFTA_TABLE_MAX,
7960 .policy = nft_table_policy,
7962 [NFT_MSG_DELTABLE] = {
7963 .call = nf_tables_deltable,
7964 .type = NFNL_CB_BATCH,
7965 .attr_count = NFTA_TABLE_MAX,
7966 .policy = nft_table_policy,
7968 [NFT_MSG_NEWCHAIN] = {
7969 .call = nf_tables_newchain,
7970 .type = NFNL_CB_BATCH,
7971 .attr_count = NFTA_CHAIN_MAX,
7972 .policy = nft_chain_policy,
7974 [NFT_MSG_GETCHAIN] = {
7975 .call = nf_tables_getchain,
7976 .type = NFNL_CB_RCU,
7977 .attr_count = NFTA_CHAIN_MAX,
7978 .policy = nft_chain_policy,
7980 [NFT_MSG_DELCHAIN] = {
7981 .call = nf_tables_delchain,
7982 .type = NFNL_CB_BATCH,
7983 .attr_count = NFTA_CHAIN_MAX,
7984 .policy = nft_chain_policy,
7986 [NFT_MSG_NEWRULE] = {
7987 .call = nf_tables_newrule,
7988 .type = NFNL_CB_BATCH,
7989 .attr_count = NFTA_RULE_MAX,
7990 .policy = nft_rule_policy,
7992 [NFT_MSG_GETRULE] = {
7993 .call = nf_tables_getrule,
7994 .type = NFNL_CB_RCU,
7995 .attr_count = NFTA_RULE_MAX,
7996 .policy = nft_rule_policy,
7998 [NFT_MSG_DELRULE] = {
7999 .call = nf_tables_delrule,
8000 .type = NFNL_CB_BATCH,
8001 .attr_count = NFTA_RULE_MAX,
8002 .policy = nft_rule_policy,
8004 [NFT_MSG_NEWSET] = {
8005 .call = nf_tables_newset,
8006 .type = NFNL_CB_BATCH,
8007 .attr_count = NFTA_SET_MAX,
8008 .policy = nft_set_policy,
8010 [NFT_MSG_GETSET] = {
8011 .call = nf_tables_getset,
8012 .type = NFNL_CB_RCU,
8013 .attr_count = NFTA_SET_MAX,
8014 .policy = nft_set_policy,
8016 [NFT_MSG_DELSET] = {
8017 .call = nf_tables_delset,
8018 .type = NFNL_CB_BATCH,
8019 .attr_count = NFTA_SET_MAX,
8020 .policy = nft_set_policy,
8022 [NFT_MSG_NEWSETELEM] = {
8023 .call = nf_tables_newsetelem,
8024 .type = NFNL_CB_BATCH,
8025 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8026 .policy = nft_set_elem_list_policy,
8028 [NFT_MSG_GETSETELEM] = {
8029 .call = nf_tables_getsetelem,
8030 .type = NFNL_CB_RCU,
8031 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8032 .policy = nft_set_elem_list_policy,
8034 [NFT_MSG_DELSETELEM] = {
8035 .call = nf_tables_delsetelem,
8036 .type = NFNL_CB_BATCH,
8037 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8038 .policy = nft_set_elem_list_policy,
8040 [NFT_MSG_GETGEN] = {
8041 .call = nf_tables_getgen,
8042 .type = NFNL_CB_RCU,
8044 [NFT_MSG_NEWOBJ] = {
8045 .call = nf_tables_newobj,
8046 .type = NFNL_CB_BATCH,
8047 .attr_count = NFTA_OBJ_MAX,
8048 .policy = nft_obj_policy,
8050 [NFT_MSG_GETOBJ] = {
8051 .call = nf_tables_getobj,
8052 .type = NFNL_CB_RCU,
8053 .attr_count = NFTA_OBJ_MAX,
8054 .policy = nft_obj_policy,
8056 [NFT_MSG_DELOBJ] = {
8057 .call = nf_tables_delobj,
8058 .type = NFNL_CB_BATCH,
8059 .attr_count = NFTA_OBJ_MAX,
8060 .policy = nft_obj_policy,
8062 [NFT_MSG_GETOBJ_RESET] = {
8063 .call = nf_tables_getobj,
8064 .type = NFNL_CB_RCU,
8065 .attr_count = NFTA_OBJ_MAX,
8066 .policy = nft_obj_policy,
8068 [NFT_MSG_NEWFLOWTABLE] = {
8069 .call = nf_tables_newflowtable,
8070 .type = NFNL_CB_BATCH,
8071 .attr_count = NFTA_FLOWTABLE_MAX,
8072 .policy = nft_flowtable_policy,
8074 [NFT_MSG_GETFLOWTABLE] = {
8075 .call = nf_tables_getflowtable,
8076 .type = NFNL_CB_RCU,
8077 .attr_count = NFTA_FLOWTABLE_MAX,
8078 .policy = nft_flowtable_policy,
8080 [NFT_MSG_DELFLOWTABLE] = {
8081 .call = nf_tables_delflowtable,
8082 .type = NFNL_CB_BATCH,
8083 .attr_count = NFTA_FLOWTABLE_MAX,
8084 .policy = nft_flowtable_policy,
8088 static int nf_tables_validate(struct net *net)
8090 struct nftables_pernet *nft_net = nft_pernet(net);
8091 struct nft_table *table;
8093 switch (nft_net->validate_state) {
8094 case NFT_VALIDATE_SKIP:
8096 case NFT_VALIDATE_NEED:
8097 nft_validate_state_update(net, NFT_VALIDATE_DO);
8099 case NFT_VALIDATE_DO:
8100 list_for_each_entry(table, &nft_net->tables, list) {
8101 if (nft_table_validate(net, table) < 0)
8110 /* a drop policy has to be deferred until all rules have been activated,
8111 * otherwise a large ruleset that contains a drop-policy base chain will
8112 * cause all packets to get dropped until the full transaction has been
8115 * We defer the drop policy until the transaction has been finalized.
8117 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8119 struct nft_base_chain *basechain;
8121 if (nft_trans_chain_policy(trans) != NF_DROP)
8124 if (!nft_is_base_chain(trans->ctx.chain))
8127 basechain = nft_base_chain(trans->ctx.chain);
8128 basechain->policy = NF_DROP;
8131 static void nft_chain_commit_update(struct nft_trans *trans)
8133 struct nft_base_chain *basechain;
8135 if (nft_trans_chain_name(trans)) {
8136 rhltable_remove(&trans->ctx.table->chains_ht,
8137 &trans->ctx.chain->rhlhead,
8138 nft_chain_ht_params);
8139 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8140 rhltable_insert_key(&trans->ctx.table->chains_ht,
8141 trans->ctx.chain->name,
8142 &trans->ctx.chain->rhlhead,
8143 nft_chain_ht_params);
8146 if (!nft_is_base_chain(trans->ctx.chain))
8149 nft_chain_stats_replace(trans);
8151 basechain = nft_base_chain(trans->ctx.chain);
8153 switch (nft_trans_chain_policy(trans)) {
8156 basechain->policy = nft_trans_chain_policy(trans);
8161 static void nft_obj_commit_update(struct nft_trans *trans)
8163 struct nft_object *newobj;
8164 struct nft_object *obj;
8166 obj = nft_trans_obj(trans);
8167 newobj = nft_trans_obj_newobj(trans);
8169 if (obj->ops->update)
8170 obj->ops->update(obj, newobj);
8175 static void nft_commit_release(struct nft_trans *trans)
8177 switch (trans->msg_type) {
8178 case NFT_MSG_DELTABLE:
8179 nf_tables_table_destroy(&trans->ctx);
8181 case NFT_MSG_NEWCHAIN:
8182 free_percpu(nft_trans_chain_stats(trans));
8183 kfree(nft_trans_chain_name(trans));
8185 case NFT_MSG_DELCHAIN:
8186 nf_tables_chain_destroy(&trans->ctx);
8188 case NFT_MSG_DELRULE:
8189 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8191 case NFT_MSG_DELSET:
8192 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8194 case NFT_MSG_DELSETELEM:
8195 nf_tables_set_elem_destroy(&trans->ctx,
8196 nft_trans_elem_set(trans),
8197 nft_trans_elem(trans).priv);
8199 case NFT_MSG_DELOBJ:
8200 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8202 case NFT_MSG_DELFLOWTABLE:
8203 if (nft_trans_flowtable_update(trans))
8204 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8206 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8211 put_net(trans->ctx.net);
8216 static void nf_tables_trans_destroy_work(struct work_struct *w)
8218 struct nft_trans *trans, *next;
8221 spin_lock(&nf_tables_destroy_list_lock);
8222 list_splice_init(&nf_tables_destroy_list, &head);
8223 spin_unlock(&nf_tables_destroy_list_lock);
8225 if (list_empty(&head))
8230 list_for_each_entry_safe(trans, next, &head, list) {
8231 list_del(&trans->list);
8232 nft_commit_release(trans);
8236 void nf_tables_trans_destroy_flush_work(void)
8238 flush_work(&trans_destroy_work);
8240 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8242 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8244 struct nft_rule *rule;
8245 unsigned int alloc = 0;
8248 /* already handled or inactive chain? */
8249 if (chain->rules_next || !nft_is_active_next(net, chain))
8252 rule = list_entry(&chain->rules, struct nft_rule, list);
8255 list_for_each_entry_continue(rule, &chain->rules, list) {
8256 if (nft_is_active_next(net, rule))
8260 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8261 if (!chain->rules_next)
8264 list_for_each_entry_continue(rule, &chain->rules, list) {
8265 if (nft_is_active_next(net, rule))
8266 chain->rules_next[i++] = rule;
8269 chain->rules_next[i] = NULL;
8273 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8275 struct nftables_pernet *nft_net = nft_pernet(net);
8276 struct nft_trans *trans, *next;
8278 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8279 struct nft_chain *chain = trans->ctx.chain;
8281 if (trans->msg_type == NFT_MSG_NEWRULE ||
8282 trans->msg_type == NFT_MSG_DELRULE) {
8283 kvfree(chain->rules_next);
8284 chain->rules_next = NULL;
8289 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8291 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8296 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8298 struct nft_rule **r = rules;
8299 struct nft_rules_old *old;
8304 r++; /* rcu_head is after end marker */
8308 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8311 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8313 struct nft_rule **g0, **g1;
8316 next_genbit = nft_gencursor_next(net);
8318 g0 = rcu_dereference_protected(chain->rules_gen_0,
8319 lockdep_commit_lock_is_held(net));
8320 g1 = rcu_dereference_protected(chain->rules_gen_1,
8321 lockdep_commit_lock_is_held(net));
8323 /* No changes to this chain? */
8324 if (chain->rules_next == NULL) {
8325 /* chain had no change in last or next generation */
8329 * chain had no change in this generation; make sure next
8330 * one uses same rules as current generation.
8333 rcu_assign_pointer(chain->rules_gen_1, g0);
8334 nf_tables_commit_chain_free_rules_old(g1);
8336 rcu_assign_pointer(chain->rules_gen_0, g1);
8337 nf_tables_commit_chain_free_rules_old(g0);
8344 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8346 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8348 chain->rules_next = NULL;
8354 nf_tables_commit_chain_free_rules_old(g1);
8356 nf_tables_commit_chain_free_rules_old(g0);
8359 static void nft_obj_del(struct nft_object *obj)
8361 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8362 list_del_rcu(&obj->list);
8365 void nft_chain_del(struct nft_chain *chain)
8367 struct nft_table *table = chain->table;
8369 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8370 nft_chain_ht_params));
8371 list_del_rcu(&chain->list);
8374 static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
8375 struct list_head *hook_list)
8377 struct nft_hook *hook, *next;
8379 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8381 list_move(&hook->list, hook_list);
8385 static void nf_tables_module_autoload_cleanup(struct net *net)
8387 struct nftables_pernet *nft_net = nft_pernet(net);
8388 struct nft_module_request *req, *next;
8390 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8391 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8392 WARN_ON_ONCE(!req->done);
8393 list_del(&req->list);
8398 static void nf_tables_commit_release(struct net *net)
8400 struct nftables_pernet *nft_net = nft_pernet(net);
8401 struct nft_trans *trans;
8403 /* all side effects have to be made visible.
8404 * For example, if a chain named 'foo' has been deleted, a
8405 * new transaction must not find it anymore.
8407 * Memory reclaim happens asynchronously from work queue
8408 * to prevent expensive synchronize_rcu() in commit phase.
8410 if (list_empty(&nft_net->commit_list)) {
8411 nf_tables_module_autoload_cleanup(net);
8412 mutex_unlock(&nft_net->commit_mutex);
8416 trans = list_last_entry(&nft_net->commit_list,
8417 struct nft_trans, list);
8418 get_net(trans->ctx.net);
8419 WARN_ON_ONCE(trans->put_net);
8421 trans->put_net = true;
8422 spin_lock(&nf_tables_destroy_list_lock);
8423 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8424 spin_unlock(&nf_tables_destroy_list_lock);
8426 nf_tables_module_autoload_cleanup(net);
8427 schedule_work(&trans_destroy_work);
8429 mutex_unlock(&nft_net->commit_mutex);
8432 static void nft_commit_notify(struct net *net, u32 portid)
8434 struct nftables_pernet *nft_net = nft_pernet(net);
8435 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8436 unsigned char *data;
8439 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8443 len = NLMSG_GOODSIZE - skb->len;
8444 list_del(&skb->list);
8448 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8449 data = skb_put(batch_skb, skb->len);
8450 memcpy(data, skb->data, skb->len);
8451 list_del(&skb->list);
8455 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8456 NFT_CB(batch_skb).report, GFP_KERNEL);
8461 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8462 NFT_CB(batch_skb).report, GFP_KERNEL);
8465 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8468 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8469 struct nft_table *table)
8471 struct nft_audit_data *adp;
8473 list_for_each_entry(adp, adl, list) {
8474 if (adp->table == table)
8477 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8481 list_add(&adp->list, adl);
8485 static void nf_tables_commit_audit_free(struct list_head *adl)
8487 struct nft_audit_data *adp, *adn;
8489 list_for_each_entry_safe(adp, adn, adl, list) {
8490 list_del(&adp->list);
8495 static void nf_tables_commit_audit_collect(struct list_head *adl,
8496 struct nft_table *table, u32 op)
8498 struct nft_audit_data *adp;
8500 list_for_each_entry(adp, adl, list) {
8501 if (adp->table == table)
8504 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8508 if (!adp->op || adp->op > op)
8512 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8514 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8516 struct nft_audit_data *adp, *adn;
8517 char aubuf[AUNFTABLENAMELEN];
8519 list_for_each_entry_safe(adp, adn, adl, list) {
8520 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8522 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8523 nft2audit_op[adp->op], GFP_KERNEL);
8524 list_del(&adp->list);
8529 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8531 struct nftables_pernet *nft_net = nft_pernet(net);
8532 struct nft_trans *trans, *next;
8533 struct nft_trans_elem *te;
8534 struct nft_chain *chain;
8535 struct nft_table *table;
8539 if (list_empty(&nft_net->commit_list)) {
8540 mutex_unlock(&nft_net->commit_mutex);
8544 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8545 if (nf_tables_validate(net) < 0)
8548 err = nft_flow_rule_offload_commit(net);
8552 /* 1. Allocate space for next generation rules_gen_X[] */
8553 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8556 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8558 nf_tables_commit_chain_prepare_cancel(net);
8559 nf_tables_commit_audit_free(&adl);
8562 if (trans->msg_type == NFT_MSG_NEWRULE ||
8563 trans->msg_type == NFT_MSG_DELRULE) {
8564 chain = trans->ctx.chain;
8566 ret = nf_tables_commit_chain_prepare(net, chain);
8568 nf_tables_commit_chain_prepare_cancel(net);
8569 nf_tables_commit_audit_free(&adl);
8575 /* step 2. Make rules_gen_X visible to packet path */
8576 list_for_each_entry(table, &nft_net->tables, list) {
8577 list_for_each_entry(chain, &table->chains, list)
8578 nf_tables_commit_chain(net, chain);
8582 * Bump generation counter, invalidate any dump in progress.
8583 * Cannot fail after this point.
8585 while (++nft_net->base_seq == 0)
8588 /* step 3. Start new generation, rules_gen_X now in use. */
8589 net->nft.gencursor = nft_gencursor_next(net);
8591 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8592 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8594 switch (trans->msg_type) {
8595 case NFT_MSG_NEWTABLE:
8596 if (nft_trans_table_update(trans)) {
8597 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8598 nft_trans_destroy(trans);
8601 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8602 nf_tables_table_disable(net, trans->ctx.table);
8604 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8606 nft_clear(net, trans->ctx.table);
8608 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8609 nft_trans_destroy(trans);
8611 case NFT_MSG_DELTABLE:
8612 list_del_rcu(&trans->ctx.table->list);
8613 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8615 case NFT_MSG_NEWCHAIN:
8616 if (nft_trans_chain_update(trans)) {
8617 nft_chain_commit_update(trans);
8618 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8619 /* trans destroyed after rcu grace period */
8621 nft_chain_commit_drop_policy(trans);
8622 nft_clear(net, trans->ctx.chain);
8623 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8624 nft_trans_destroy(trans);
8627 case NFT_MSG_DELCHAIN:
8628 nft_chain_del(trans->ctx.chain);
8629 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8630 nf_tables_unregister_hook(trans->ctx.net,
8634 case NFT_MSG_NEWRULE:
8635 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8636 nf_tables_rule_notify(&trans->ctx,
8637 nft_trans_rule(trans),
8639 nft_trans_destroy(trans);
8641 case NFT_MSG_DELRULE:
8642 list_del_rcu(&nft_trans_rule(trans)->list);
8643 nf_tables_rule_notify(&trans->ctx,
8644 nft_trans_rule(trans),
8646 nft_rule_expr_deactivate(&trans->ctx,
8647 nft_trans_rule(trans),
8650 case NFT_MSG_NEWSET:
8651 nft_clear(net, nft_trans_set(trans));
8652 /* This avoids hitting -EBUSY when deleting the table
8653 * from the transaction.
8655 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8656 !list_empty(&nft_trans_set(trans)->bindings))
8657 trans->ctx.table->use--;
8659 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8660 NFT_MSG_NEWSET, GFP_KERNEL);
8661 nft_trans_destroy(trans);
8663 case NFT_MSG_DELSET:
8664 list_del_rcu(&nft_trans_set(trans)->list);
8665 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8666 NFT_MSG_DELSET, GFP_KERNEL);
8668 case NFT_MSG_NEWSETELEM:
8669 te = (struct nft_trans_elem *)trans->data;
8671 nft_setelem_activate(net, te->set, &te->elem);
8672 nf_tables_setelem_notify(&trans->ctx, te->set,
8674 NFT_MSG_NEWSETELEM);
8675 nft_trans_destroy(trans);
8677 case NFT_MSG_DELSETELEM:
8678 te = (struct nft_trans_elem *)trans->data;
8680 nf_tables_setelem_notify(&trans->ctx, te->set,
8682 NFT_MSG_DELSETELEM);
8683 nft_setelem_remove(net, te->set, &te->elem);
8684 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8685 atomic_dec(&te->set->nelems);
8689 case NFT_MSG_NEWOBJ:
8690 if (nft_trans_obj_update(trans)) {
8691 nft_obj_commit_update(trans);
8692 nf_tables_obj_notify(&trans->ctx,
8693 nft_trans_obj(trans),
8696 nft_clear(net, nft_trans_obj(trans));
8697 nf_tables_obj_notify(&trans->ctx,
8698 nft_trans_obj(trans),
8700 nft_trans_destroy(trans);
8703 case NFT_MSG_DELOBJ:
8704 nft_obj_del(nft_trans_obj(trans));
8705 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8708 case NFT_MSG_NEWFLOWTABLE:
8709 if (nft_trans_flowtable_update(trans)) {
8710 nft_trans_flowtable(trans)->data.flags =
8711 nft_trans_flowtable_flags(trans);
8712 nf_tables_flowtable_notify(&trans->ctx,
8713 nft_trans_flowtable(trans),
8714 &nft_trans_flowtable_hooks(trans),
8715 NFT_MSG_NEWFLOWTABLE);
8716 list_splice(&nft_trans_flowtable_hooks(trans),
8717 &nft_trans_flowtable(trans)->hook_list);
8719 nft_clear(net, nft_trans_flowtable(trans));
8720 nf_tables_flowtable_notify(&trans->ctx,
8721 nft_trans_flowtable(trans),
8722 &nft_trans_flowtable(trans)->hook_list,
8723 NFT_MSG_NEWFLOWTABLE);
8725 nft_trans_destroy(trans);
8727 case NFT_MSG_DELFLOWTABLE:
8728 if (nft_trans_flowtable_update(trans)) {
8729 nft_flowtable_hooks_del(nft_trans_flowtable(trans),
8730 &nft_trans_flowtable_hooks(trans));
8731 nf_tables_flowtable_notify(&trans->ctx,
8732 nft_trans_flowtable(trans),
8733 &nft_trans_flowtable_hooks(trans),
8734 NFT_MSG_DELFLOWTABLE);
8735 nft_unregister_flowtable_net_hooks(net,
8736 &nft_trans_flowtable_hooks(trans));
8738 list_del_rcu(&nft_trans_flowtable(trans)->list);
8739 nf_tables_flowtable_notify(&trans->ctx,
8740 nft_trans_flowtable(trans),
8741 &nft_trans_flowtable(trans)->hook_list,
8742 NFT_MSG_DELFLOWTABLE);
8743 nft_unregister_flowtable_net_hooks(net,
8744 &nft_trans_flowtable(trans)->hook_list);
8750 nft_commit_notify(net, NETLINK_CB(skb).portid);
8751 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8752 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8753 nf_tables_commit_release(net);
8758 static void nf_tables_module_autoload(struct net *net)
8760 struct nftables_pernet *nft_net = nft_pernet(net);
8761 struct nft_module_request *req, *next;
8762 LIST_HEAD(module_list);
8764 list_splice_init(&nft_net->module_list, &module_list);
8765 mutex_unlock(&nft_net->commit_mutex);
8766 list_for_each_entry_safe(req, next, &module_list, list) {
8767 request_module("%s", req->module);
8770 mutex_lock(&nft_net->commit_mutex);
8771 list_splice(&module_list, &nft_net->module_list);
8774 static void nf_tables_abort_release(struct nft_trans *trans)
8776 switch (trans->msg_type) {
8777 case NFT_MSG_NEWTABLE:
8778 nf_tables_table_destroy(&trans->ctx);
8780 case NFT_MSG_NEWCHAIN:
8781 nf_tables_chain_destroy(&trans->ctx);
8783 case NFT_MSG_NEWRULE:
8784 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8786 case NFT_MSG_NEWSET:
8787 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8789 case NFT_MSG_NEWSETELEM:
8790 nft_set_elem_destroy(nft_trans_elem_set(trans),
8791 nft_trans_elem(trans).priv, true);
8793 case NFT_MSG_NEWOBJ:
8794 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8796 case NFT_MSG_NEWFLOWTABLE:
8797 if (nft_trans_flowtable_update(trans))
8798 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8800 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8806 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8808 struct nftables_pernet *nft_net = nft_pernet(net);
8809 struct nft_trans *trans, *next;
8810 struct nft_trans_elem *te;
8811 struct nft_hook *hook;
8813 if (action == NFNL_ABORT_VALIDATE &&
8814 nf_tables_validate(net) < 0)
8817 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8819 switch (trans->msg_type) {
8820 case NFT_MSG_NEWTABLE:
8821 if (nft_trans_table_update(trans)) {
8822 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8823 nft_trans_destroy(trans);
8826 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8827 nf_tables_table_disable(net, trans->ctx.table);
8828 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8829 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8830 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8832 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8833 nft_trans_destroy(trans);
8835 list_del_rcu(&trans->ctx.table->list);
8838 case NFT_MSG_DELTABLE:
8839 nft_clear(trans->ctx.net, trans->ctx.table);
8840 nft_trans_destroy(trans);
8842 case NFT_MSG_NEWCHAIN:
8843 if (nft_trans_chain_update(trans)) {
8844 free_percpu(nft_trans_chain_stats(trans));
8845 kfree(nft_trans_chain_name(trans));
8846 nft_trans_destroy(trans);
8848 if (nft_chain_is_bound(trans->ctx.chain)) {
8849 nft_trans_destroy(trans);
8852 trans->ctx.table->use--;
8853 nft_chain_del(trans->ctx.chain);
8854 nf_tables_unregister_hook(trans->ctx.net,
8859 case NFT_MSG_DELCHAIN:
8860 trans->ctx.table->use++;
8861 nft_clear(trans->ctx.net, trans->ctx.chain);
8862 nft_trans_destroy(trans);
8864 case NFT_MSG_NEWRULE:
8865 trans->ctx.chain->use--;
8866 list_del_rcu(&nft_trans_rule(trans)->list);
8867 nft_rule_expr_deactivate(&trans->ctx,
8868 nft_trans_rule(trans),
8870 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8871 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8873 case NFT_MSG_DELRULE:
8874 trans->ctx.chain->use++;
8875 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8876 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8877 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8878 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8880 nft_trans_destroy(trans);
8882 case NFT_MSG_NEWSET:
8883 trans->ctx.table->use--;
8884 if (nft_trans_set_bound(trans)) {
8885 nft_trans_destroy(trans);
8888 list_del_rcu(&nft_trans_set(trans)->list);
8890 case NFT_MSG_DELSET:
8891 trans->ctx.table->use++;
8892 nft_clear(trans->ctx.net, nft_trans_set(trans));
8893 nft_trans_destroy(trans);
8895 case NFT_MSG_NEWSETELEM:
8896 if (nft_trans_elem_set_bound(trans)) {
8897 nft_trans_destroy(trans);
8900 te = (struct nft_trans_elem *)trans->data;
8901 nft_setelem_remove(net, te->set, &te->elem);
8902 if (!nft_setelem_is_catchall(te->set, &te->elem))
8903 atomic_dec(&te->set->nelems);
8905 case NFT_MSG_DELSETELEM:
8906 te = (struct nft_trans_elem *)trans->data;
8908 nft_setelem_data_activate(net, te->set, &te->elem);
8909 nft_setelem_activate(net, te->set, &te->elem);
8910 if (!nft_setelem_is_catchall(te->set, &te->elem))
8913 nft_trans_destroy(trans);
8915 case NFT_MSG_NEWOBJ:
8916 if (nft_trans_obj_update(trans)) {
8917 kfree(nft_trans_obj_newobj(trans));
8918 nft_trans_destroy(trans);
8920 trans->ctx.table->use--;
8921 nft_obj_del(nft_trans_obj(trans));
8924 case NFT_MSG_DELOBJ:
8925 trans->ctx.table->use++;
8926 nft_clear(trans->ctx.net, nft_trans_obj(trans));
8927 nft_trans_destroy(trans);
8929 case NFT_MSG_NEWFLOWTABLE:
8930 if (nft_trans_flowtable_update(trans)) {
8931 nft_unregister_flowtable_net_hooks(net,
8932 &nft_trans_flowtable_hooks(trans));
8934 trans->ctx.table->use--;
8935 list_del_rcu(&nft_trans_flowtable(trans)->list);
8936 nft_unregister_flowtable_net_hooks(net,
8937 &nft_trans_flowtable(trans)->hook_list);
8940 case NFT_MSG_DELFLOWTABLE:
8941 if (nft_trans_flowtable_update(trans)) {
8942 list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
8943 hook->inactive = false;
8945 trans->ctx.table->use++;
8946 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
8948 nft_trans_destroy(trans);
8955 list_for_each_entry_safe_reverse(trans, next,
8956 &nft_net->commit_list, list) {
8957 list_del(&trans->list);
8958 nf_tables_abort_release(trans);
8961 if (action == NFNL_ABORT_AUTOLOAD)
8962 nf_tables_module_autoload(net);
8964 nf_tables_module_autoload_cleanup(net);
8969 static void nf_tables_cleanup(struct net *net)
8971 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8974 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
8975 enum nfnl_abort_action action)
8977 struct nftables_pernet *nft_net = nft_pernet(net);
8978 int ret = __nf_tables_abort(net, action);
8980 mutex_unlock(&nft_net->commit_mutex);
8985 static bool nf_tables_valid_genid(struct net *net, u32 genid)
8987 struct nftables_pernet *nft_net = nft_pernet(net);
8990 mutex_lock(&nft_net->commit_mutex);
8992 genid_ok = genid == 0 || nft_net->base_seq == genid;
8994 mutex_unlock(&nft_net->commit_mutex);
8996 /* else, commit mutex has to be released by commit or abort function */
9000 static const struct nfnetlink_subsystem nf_tables_subsys = {
9001 .name = "nf_tables",
9002 .subsys_id = NFNL_SUBSYS_NFTABLES,
9003 .cb_count = NFT_MSG_MAX,
9005 .commit = nf_tables_commit,
9006 .abort = nf_tables_abort,
9007 .cleanup = nf_tables_cleanup,
9008 .valid_genid = nf_tables_valid_genid,
9009 .owner = THIS_MODULE,
9012 int nft_chain_validate_dependency(const struct nft_chain *chain,
9013 enum nft_chain_types type)
9015 const struct nft_base_chain *basechain;
9017 if (nft_is_base_chain(chain)) {
9018 basechain = nft_base_chain(chain);
9019 if (basechain->type->type != type)
9024 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9026 int nft_chain_validate_hooks(const struct nft_chain *chain,
9027 unsigned int hook_flags)
9029 struct nft_base_chain *basechain;
9031 if (nft_is_base_chain(chain)) {
9032 basechain = nft_base_chain(chain);
9034 if ((1 << basechain->ops.hooknum) & hook_flags)
9042 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9045 * Loop detection - walk through the ruleset beginning at the destination chain
9046 * of a new jump until either the source chain is reached (loop) or all
9047 * reachable chains have been traversed.
9049 * The loop check is performed whenever a new jump verdict is added to an
9050 * expression or verdict map or a verdict map is bound to a new chain.
9053 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9054 const struct nft_chain *chain);
9056 static int nft_check_loops(const struct nft_ctx *ctx,
9057 const struct nft_set_ext *ext)
9059 const struct nft_data *data;
9062 data = nft_set_ext_data(ext);
9063 switch (data->verdict.code) {
9066 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9076 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9077 struct nft_set *set,
9078 const struct nft_set_iter *iter,
9079 struct nft_set_elem *elem)
9081 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9083 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9084 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9087 return nft_check_loops(ctx, ext);
9090 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9091 struct nft_set *set)
9093 u8 genmask = nft_genmask_next(ctx->net);
9094 struct nft_set_elem_catchall *catchall;
9095 struct nft_set_ext *ext;
9098 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9099 ext = nft_set_elem_ext(set, catchall->elem);
9100 if (!nft_set_elem_active(ext, genmask))
9103 ret = nft_check_loops(ctx, ext);
9111 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9112 const struct nft_chain *chain)
9114 const struct nft_rule *rule;
9115 const struct nft_expr *expr, *last;
9116 struct nft_set *set;
9117 struct nft_set_binding *binding;
9118 struct nft_set_iter iter;
9120 if (ctx->chain == chain)
9123 list_for_each_entry(rule, &chain->rules, list) {
9124 nft_rule_for_each_expr(expr, last, rule) {
9125 struct nft_immediate_expr *priv;
9126 const struct nft_data *data;
9129 if (strcmp(expr->ops->type->name, "immediate"))
9132 priv = nft_expr_priv(expr);
9133 if (priv->dreg != NFT_REG_VERDICT)
9137 switch (data->verdict.code) {
9140 err = nf_tables_check_loops(ctx,
9141 data->verdict.chain);
9151 list_for_each_entry(set, &ctx->table->sets, list) {
9152 if (!nft_is_active_next(ctx->net, set))
9154 if (!(set->flags & NFT_SET_MAP) ||
9155 set->dtype != NFT_DATA_VERDICT)
9158 list_for_each_entry(binding, &set->bindings, list) {
9159 if (!(binding->flags & NFT_SET_MAP) ||
9160 binding->chain != chain)
9163 iter.genmask = nft_genmask_next(ctx->net);
9167 iter.fn = nf_tables_loop_check_setelem;
9169 set->ops->walk(ctx, set, &iter);
9171 iter.err = nft_set_catchall_loops(ctx, set);
9182 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9184 * @attr: netlink attribute to fetch value from
9185 * @max: maximum value to be stored in dest
9186 * @dest: pointer to the variable
9188 * Parse, check and store a given u32 netlink attribute into variable.
9189 * This function returns -ERANGE if the value goes over maximum value.
9190 * Otherwise a 0 is returned and the attribute value is stored in the
9191 * destination variable.
9193 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9197 val = ntohl(nla_get_be32(attr));
9204 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9206 static unsigned int nft_parse_register(const struct nlattr *attr)
9210 reg = ntohl(nla_get_be32(attr));
9212 case NFT_REG_VERDICT...NFT_REG_4:
9213 return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9215 return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9220 * nft_dump_register - dump a register value to a netlink attribute
9222 * @skb: socket buffer
9223 * @attr: attribute number
9224 * @reg: register number
9226 * Construct a netlink attribute containing the register number. For
9227 * compatibility reasons, register numbers being a multiple of 4 are
9228 * translated to the corresponding 128 bit register numbers.
9230 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9232 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9233 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9235 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9237 return nla_put_be32(skb, attr, htonl(reg));
9239 EXPORT_SYMBOL_GPL(nft_dump_register);
9241 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9243 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9247 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9253 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9258 reg = nft_parse_register(attr);
9259 err = nft_validate_register_load(reg, len);
9266 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9268 static int nft_validate_register_store(const struct nft_ctx *ctx,
9269 enum nft_registers reg,
9270 const struct nft_data *data,
9271 enum nft_data_types type,
9277 case NFT_REG_VERDICT:
9278 if (type != NFT_DATA_VERDICT)
9282 (data->verdict.code == NFT_GOTO ||
9283 data->verdict.code == NFT_JUMP)) {
9284 err = nf_tables_check_loops(ctx, data->verdict.chain);
9291 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9295 if (reg * NFT_REG32_SIZE + len >
9296 sizeof_field(struct nft_regs, data))
9299 if (data != NULL && type != NFT_DATA_VALUE)
9305 int nft_parse_register_store(const struct nft_ctx *ctx,
9306 const struct nlattr *attr, u8 *dreg,
9307 const struct nft_data *data,
9308 enum nft_data_types type, unsigned int len)
9313 reg = nft_parse_register(attr);
9314 err = nft_validate_register_store(ctx, reg, data, type, len);
9321 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9323 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9324 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9325 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9326 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9327 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9330 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9331 struct nft_data_desc *desc, const struct nlattr *nla)
9333 u8 genmask = nft_genmask_next(ctx->net);
9334 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9335 struct nft_chain *chain;
9338 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9339 nft_verdict_policy, NULL);
9343 if (!tb[NFTA_VERDICT_CODE])
9345 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9347 switch (data->verdict.code) {
9349 switch (data->verdict.code & NF_VERDICT_MASK) {
9364 if (tb[NFTA_VERDICT_CHAIN]) {
9365 chain = nft_chain_lookup(ctx->net, ctx->table,
9366 tb[NFTA_VERDICT_CHAIN],
9368 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9369 chain = nft_chain_lookup_byid(ctx->net,
9370 tb[NFTA_VERDICT_CHAIN_ID]);
9372 return PTR_ERR(chain);
9378 return PTR_ERR(chain);
9379 if (nft_is_base_chain(chain))
9383 data->verdict.chain = chain;
9387 desc->len = sizeof(data->verdict);
9388 desc->type = NFT_DATA_VERDICT;
9392 static void nft_verdict_uninit(const struct nft_data *data)
9394 struct nft_chain *chain;
9395 struct nft_rule *rule;
9397 switch (data->verdict.code) {
9400 chain = data->verdict.chain;
9403 if (!nft_chain_is_bound(chain))
9406 chain->table->use--;
9407 list_for_each_entry(rule, &chain->rules, list)
9410 nft_chain_del(chain);
9415 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9417 struct nlattr *nest;
9419 nest = nla_nest_start_noflag(skb, type);
9421 goto nla_put_failure;
9423 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9424 goto nla_put_failure;
9429 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9431 goto nla_put_failure;
9433 nla_nest_end(skb, nest);
9440 static int nft_value_init(const struct nft_ctx *ctx,
9441 struct nft_data *data, unsigned int size,
9442 struct nft_data_desc *desc, const struct nlattr *nla)
9452 nla_memcpy(data->data, nla, len);
9453 desc->type = NFT_DATA_VALUE;
9458 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9461 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9464 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9465 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9466 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9470 * nft_data_init - parse nf_tables data netlink attributes
9472 * @ctx: context of the expression using the data
9473 * @data: destination struct nft_data
9474 * @size: maximum data length
9475 * @desc: data description
9476 * @nla: netlink attribute containing data
9478 * Parse the netlink data attributes and initialize a struct nft_data.
9479 * The type and length of data are returned in the data description.
9481 * The caller can indicate that it only wants to accept data of type
9482 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9484 int nft_data_init(const struct nft_ctx *ctx,
9485 struct nft_data *data, unsigned int size,
9486 struct nft_data_desc *desc, const struct nlattr *nla)
9488 struct nlattr *tb[NFTA_DATA_MAX + 1];
9491 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9492 nft_data_policy, NULL);
9496 if (tb[NFTA_DATA_VALUE])
9497 return nft_value_init(ctx, data, size, desc,
9498 tb[NFTA_DATA_VALUE]);
9499 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9500 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9503 EXPORT_SYMBOL_GPL(nft_data_init);
9506 * nft_data_release - release a nft_data item
9508 * @data: struct nft_data to release
9509 * @type: type of data
9511 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9512 * all others need to be released by calling this function.
9514 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9516 if (type < NFT_DATA_VERDICT)
9519 case NFT_DATA_VERDICT:
9520 return nft_verdict_uninit(data);
9525 EXPORT_SYMBOL_GPL(nft_data_release);
9527 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9528 enum nft_data_types type, unsigned int len)
9530 struct nlattr *nest;
9533 nest = nla_nest_start_noflag(skb, attr);
9538 case NFT_DATA_VALUE:
9539 err = nft_value_dump(skb, data, len);
9541 case NFT_DATA_VERDICT:
9542 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9549 nla_nest_end(skb, nest);
9552 EXPORT_SYMBOL_GPL(nft_data_dump);
9554 int __nft_release_basechain(struct nft_ctx *ctx)
9556 struct nft_rule *rule, *nr;
9558 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9561 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9562 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9563 list_del(&rule->list);
9565 nf_tables_rule_release(ctx, rule);
9567 nft_chain_del(ctx->chain);
9569 nf_tables_chain_destroy(ctx);
9573 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9575 static void __nft_release_hook(struct net *net, struct nft_table *table)
9577 struct nft_chain *chain;
9579 list_for_each_entry(chain, &table->chains, list)
9580 nf_tables_unregister_hook(net, table, chain);
9583 static void __nft_release_hooks(struct net *net)
9585 struct nftables_pernet *nft_net = nft_pernet(net);
9586 struct nft_table *table;
9588 list_for_each_entry(table, &nft_net->tables, list) {
9589 if (nft_table_has_owner(table))
9592 __nft_release_hook(net, table);
9596 static void __nft_release_table(struct net *net, struct nft_table *table)
9598 struct nft_flowtable *flowtable, *nf;
9599 struct nft_chain *chain, *nc;
9600 struct nft_object *obj, *ne;
9601 struct nft_rule *rule, *nr;
9602 struct nft_set *set, *ns;
9603 struct nft_ctx ctx = {
9605 .family = NFPROTO_NETDEV,
9608 ctx.family = table->family;
9610 list_for_each_entry(chain, &table->chains, list) {
9612 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9613 list_del(&rule->list);
9615 nf_tables_rule_release(&ctx, rule);
9618 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9619 list_del(&flowtable->list);
9621 nf_tables_flowtable_destroy(flowtable);
9623 list_for_each_entry_safe(set, ns, &table->sets, list) {
9624 list_del(&set->list);
9626 nft_set_destroy(&ctx, set);
9628 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9631 nft_obj_destroy(&ctx, obj);
9633 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9635 nft_chain_del(chain);
9637 nf_tables_chain_destroy(&ctx);
9639 nf_tables_table_destroy(&ctx);
9642 static void __nft_release_tables(struct net *net)
9644 struct nftables_pernet *nft_net = nft_pernet(net);
9645 struct nft_table *table, *nt;
9647 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9648 if (nft_table_has_owner(table))
9651 list_del(&table->list);
9653 __nft_release_table(net, table);
9657 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9660 struct nft_table *table, *to_delete[8];
9661 struct nftables_pernet *nft_net;
9662 struct netlink_notify *n = ptr;
9663 struct net *net = n->net;
9664 unsigned int deleted;
9665 bool restart = false;
9667 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9670 nft_net = nft_pernet(net);
9672 mutex_lock(&nft_net->commit_mutex);
9674 list_for_each_entry(table, &nft_net->tables, list) {
9675 if (nft_table_has_owner(table) &&
9676 n->portid == table->nlpid) {
9677 __nft_release_hook(net, table);
9678 list_del_rcu(&table->list);
9679 to_delete[deleted++] = table;
9680 if (deleted >= ARRAY_SIZE(to_delete))
9685 restart = deleted >= ARRAY_SIZE(to_delete);
9688 __nft_release_table(net, to_delete[--deleted]);
9693 mutex_unlock(&nft_net->commit_mutex);
9698 static struct notifier_block nft_nl_notifier = {
9699 .notifier_call = nft_rcv_nl_event,
9702 static int __net_init nf_tables_init_net(struct net *net)
9704 struct nftables_pernet *nft_net = nft_pernet(net);
9706 INIT_LIST_HEAD(&nft_net->tables);
9707 INIT_LIST_HEAD(&nft_net->commit_list);
9708 INIT_LIST_HEAD(&nft_net->module_list);
9709 INIT_LIST_HEAD(&nft_net->notify_list);
9710 mutex_init(&nft_net->commit_mutex);
9711 nft_net->base_seq = 1;
9712 nft_net->validate_state = NFT_VALIDATE_SKIP;
9717 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9719 __nft_release_hooks(net);
9722 static void __net_exit nf_tables_exit_net(struct net *net)
9724 struct nftables_pernet *nft_net = nft_pernet(net);
9726 mutex_lock(&nft_net->commit_mutex);
9727 if (!list_empty(&nft_net->commit_list))
9728 __nf_tables_abort(net, NFNL_ABORT_NONE);
9729 __nft_release_tables(net);
9730 mutex_unlock(&nft_net->commit_mutex);
9731 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9732 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9733 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9736 static struct pernet_operations nf_tables_net_ops = {
9737 .init = nf_tables_init_net,
9738 .pre_exit = nf_tables_pre_exit_net,
9739 .exit = nf_tables_exit_net,
9740 .id = &nf_tables_net_id,
9741 .size = sizeof(struct nftables_pernet),
9744 static int __init nf_tables_module_init(void)
9748 err = register_pernet_subsys(&nf_tables_net_ops);
9752 err = nft_chain_filter_init();
9754 goto err_chain_filter;
9756 err = nf_tables_core_module_init();
9758 goto err_core_module;
9760 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9762 goto err_netdev_notifier;
9764 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9766 goto err_rht_objname;
9768 err = nft_offload_init();
9772 err = netlink_register_notifier(&nft_nl_notifier);
9774 goto err_netlink_notifier;
9777 err = nfnetlink_subsys_register(&nf_tables_subsys);
9779 goto err_nfnl_subsys;
9781 nft_chain_route_init();
9786 netlink_unregister_notifier(&nft_nl_notifier);
9787 err_netlink_notifier:
9790 rhltable_destroy(&nft_objname_ht);
9792 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9793 err_netdev_notifier:
9794 nf_tables_core_module_exit();
9796 nft_chain_filter_fini();
9798 unregister_pernet_subsys(&nf_tables_net_ops);
9802 static void __exit nf_tables_module_exit(void)
9804 nfnetlink_subsys_unregister(&nf_tables_subsys);
9805 netlink_unregister_notifier(&nft_nl_notifier);
9807 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9808 nft_chain_filter_fini();
9809 nft_chain_route_fini();
9810 unregister_pernet_subsys(&nf_tables_net_ops);
9811 cancel_work_sync(&trans_destroy_work);
9813 rhltable_destroy(&nft_objname_ht);
9814 nf_tables_core_module_exit();
9817 module_init(nf_tables_module_init);
9818 module_exit(nf_tables_module_exit);
9820 MODULE_LICENSE("GPL");
9821 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9822 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);