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);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107 struct nftables_pernet *nft_net = nft_pernet(net);
109 switch (nft_net->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 case NFT_VALIDATE_NEED:
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
120 nft_net->validate_state = new_validate_state;
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125 static void nft_ctx_init(struct nft_ctx *ctx,
127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
135 ctx->family = family;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
142 ctx->flags = nlh->nlmsg_flags;
143 ctx->seq = nlh->nlmsg_seq;
146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
149 struct nft_trans *trans;
151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
155 INIT_LIST_HEAD(&trans->list);
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,
228 struct nft_hook *hook, *next;
230 list_for_each_entry_safe(hook, next, hook_list, list) {
231 nf_unregister_net_hook(net, &hook->ops);
232 if (release_netdev) {
233 list_del(&hook->list);
234 kfree_rcu(hook, rcu);
239 static int nf_tables_register_hook(struct net *net,
240 const struct nft_table *table,
241 struct nft_chain *chain)
243 struct nft_base_chain *basechain;
244 const struct nf_hook_ops *ops;
246 if (table->flags & NFT_TABLE_F_DORMANT ||
247 !nft_is_base_chain(chain))
250 basechain = nft_base_chain(chain);
251 ops = &basechain->ops;
253 if (basechain->type->ops_register)
254 return basechain->type->ops_register(net, ops);
256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
257 return nft_netdev_register_hooks(net, &basechain->hook_list);
259 return nf_register_net_hook(net, &basechain->ops);
262 static void __nf_tables_unregister_hook(struct net *net,
263 const struct nft_table *table,
264 struct nft_chain *chain,
267 struct nft_base_chain *basechain;
268 const struct nf_hook_ops *ops;
270 if (table->flags & NFT_TABLE_F_DORMANT ||
271 !nft_is_base_chain(chain))
273 basechain = nft_base_chain(chain);
274 ops = &basechain->ops;
276 if (basechain->type->ops_unregister)
277 return basechain->type->ops_unregister(net, ops);
279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
280 nft_netdev_unregister_hooks(net, &basechain->hook_list,
283 nf_unregister_net_hook(net, &basechain->ops);
286 static void nf_tables_unregister_hook(struct net *net,
287 const struct nft_table *table,
288 struct nft_chain *chain)
290 return __nf_tables_unregister_hook(net, table, chain, false);
293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
295 struct nftables_pernet *nft_net = nft_pernet(net);
297 list_add_tail(&trans->list, &nft_net->commit_list);
300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
302 struct nft_trans *trans;
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
308 if (msg_type == NFT_MSG_NEWTABLE)
309 nft_activate_next(ctx->net, ctx->table);
311 nft_trans_commit_list_add_tail(ctx->net, trans);
315 static int nft_deltable(struct nft_ctx *ctx)
319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
323 nft_deactivate_next(ctx->net, ctx->table);
327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
329 struct nft_trans *trans;
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
333 return ERR_PTR(-ENOMEM);
335 if (msg_type == NFT_MSG_NEWCHAIN) {
336 nft_activate_next(ctx->net, ctx->chain);
338 if (ctx->nla[NFTA_CHAIN_ID]) {
339 nft_trans_chain_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
344 nft_trans_commit_list_add_tail(ctx->net, trans);
348 static int nft_delchain(struct nft_ctx *ctx)
350 struct nft_trans *trans;
352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
354 return PTR_ERR(trans);
357 nft_deactivate_next(ctx->net, ctx->chain);
362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
363 struct nft_rule *rule)
365 struct nft_expr *expr;
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->activate)
370 expr->ops->activate(ctx, expr);
372 expr = nft_expr_next(expr);
376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
377 struct nft_rule *rule,
378 enum nft_trans_phase phase)
380 struct nft_expr *expr;
382 expr = nft_expr_first(rule);
383 while (nft_expr_more(rule, expr)) {
384 if (expr->ops->deactivate)
385 expr->ops->deactivate(ctx, expr, phase);
387 expr = nft_expr_next(expr);
392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
394 /* You cannot delete the same rule twice */
395 if (nft_is_active_next(ctx->net, rule)) {
396 nft_deactivate_next(ctx->net, rule);
403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
404 struct nft_rule *rule)
406 struct nft_trans *trans;
408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
413 nft_trans_rule_id(trans) =
414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
416 nft_trans_rule(trans) = rule;
417 nft_trans_commit_list_add_tail(ctx->net, trans);
422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
424 struct nft_flow_rule *flow;
425 struct nft_trans *trans;
428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
433 flow = nft_flow_rule_create(ctx->net, rule);
435 nft_trans_destroy(trans);
436 return PTR_ERR(flow);
439 nft_trans_flow_rule(trans) = flow;
442 err = nf_tables_delrule_deactivate(ctx, rule);
444 nft_trans_destroy(trans);
447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
454 struct nft_rule *rule;
457 list_for_each_entry(rule, &ctx->chain->rules, list) {
458 if (!nft_is_active_next(ctx->net, rule))
461 err = nft_delrule(ctx, rule);
468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
471 struct nft_trans *trans;
473 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
477 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
478 nft_trans_set_id(trans) =
479 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
480 nft_activate_next(ctx->net, set);
482 nft_trans_set(trans) = set;
483 nft_trans_commit_list_add_tail(ctx->net, trans);
488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
492 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
496 nft_deactivate_next(ctx->net, set);
502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
503 struct nft_object *obj)
505 struct nft_trans *trans;
507 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
511 if (msg_type == NFT_MSG_NEWOBJ)
512 nft_activate_next(ctx->net, obj);
514 nft_trans_obj(trans) = obj;
515 nft_trans_commit_list_add_tail(ctx->net, trans);
520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
524 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
528 nft_deactivate_next(ctx->net, obj);
534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
535 struct nft_flowtable *flowtable)
537 struct nft_trans *trans;
539 trans = nft_trans_alloc(ctx, msg_type,
540 sizeof(struct nft_trans_flowtable));
544 if (msg_type == NFT_MSG_NEWFLOWTABLE)
545 nft_activate_next(ctx->net, flowtable);
547 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
548 nft_trans_flowtable(trans) = flowtable;
549 nft_trans_commit_list_add_tail(ctx->net, trans);
554 static int nft_delflowtable(struct nft_ctx *ctx,
555 struct nft_flowtable *flowtable)
559 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
563 nft_deactivate_next(ctx->net, flowtable);
573 static struct nft_table *nft_table_lookup(const struct net *net,
574 const struct nlattr *nla,
575 u8 family, u8 genmask, u32 nlpid)
577 struct nftables_pernet *nft_net;
578 struct nft_table *table;
581 return ERR_PTR(-EINVAL);
583 nft_net = nft_pernet(net);
584 list_for_each_entry_rcu(table, &nft_net->tables, list,
585 lockdep_is_held(&nft_net->commit_mutex)) {
586 if (!nla_strcmp(nla, table->name) &&
587 table->family == family &&
588 nft_active_genmask(table, genmask)) {
589 if (nft_table_has_owner(table) &&
590 nlpid && table->nlpid != nlpid)
591 return ERR_PTR(-EPERM);
597 return ERR_PTR(-ENOENT);
600 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
601 const struct nlattr *nla,
602 u8 genmask, u32 nlpid)
604 struct nftables_pernet *nft_net;
605 struct nft_table *table;
607 nft_net = nft_pernet(net);
608 list_for_each_entry(table, &nft_net->tables, list) {
609 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
610 nft_active_genmask(table, genmask)) {
611 if (nft_table_has_owner(table) &&
612 nlpid && table->nlpid != nlpid)
613 return ERR_PTR(-EPERM);
619 return ERR_PTR(-ENOENT);
622 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
624 return ++table->hgenerator;
627 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
629 static const struct nft_chain_type *
630 __nft_chain_type_get(u8 family, enum nft_chain_types type)
632 if (family >= NFPROTO_NUMPROTO ||
633 type >= NFT_CHAIN_T_MAX)
636 return chain_type[family][type];
639 static const struct nft_chain_type *
640 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
642 const struct nft_chain_type *type;
645 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
646 type = __nft_chain_type_get(family, i);
649 if (!nla_strcmp(nla, type->name))
655 struct nft_module_request {
656 struct list_head list;
657 char module[MODULE_NAME_LEN];
661 #ifdef CONFIG_MODULES
662 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
665 char module_name[MODULE_NAME_LEN];
666 struct nftables_pernet *nft_net;
667 struct nft_module_request *req;
672 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
674 if (ret >= MODULE_NAME_LEN)
677 nft_net = nft_pernet(net);
678 list_for_each_entry(req, &nft_net->module_list, list) {
679 if (!strcmp(req->module, module_name)) {
683 /* A request to load this module already exists. */
688 req = kmalloc(sizeof(*req), GFP_KERNEL);
693 strlcpy(req->module, module_name, MODULE_NAME_LEN);
694 list_add_tail(&req->list, &nft_net->module_list);
698 EXPORT_SYMBOL_GPL(nft_request_module);
701 static void lockdep_nfnl_nft_mutex_not_held(void)
703 #ifdef CONFIG_PROVE_LOCKING
705 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
709 static const struct nft_chain_type *
710 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
711 u8 family, bool autoload)
713 const struct nft_chain_type *type;
715 type = __nf_tables_chain_type_lookup(nla, family);
719 lockdep_nfnl_nft_mutex_not_held();
720 #ifdef CONFIG_MODULES
722 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
724 (const char *)nla_data(nla)) == -EAGAIN)
725 return ERR_PTR(-EAGAIN);
728 return ERR_PTR(-ENOENT);
731 static __be16 nft_base_seq(const struct net *net)
733 struct nftables_pernet *nft_net = nft_pernet(net);
735 return htons(nft_net->base_seq & 0xffff);
738 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
739 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
740 .len = NFT_TABLE_MAXNAMELEN - 1 },
741 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
742 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
743 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
744 .len = NFT_USERDATA_MAXLEN }
747 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
748 u32 portid, u32 seq, int event, u32 flags,
749 int family, const struct nft_table *table)
751 struct nlmsghdr *nlh;
753 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
754 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
755 NFNETLINK_V0, nft_base_seq(net));
757 goto nla_put_failure;
759 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
760 nla_put_be32(skb, NFTA_TABLE_FLAGS,
761 htonl(table->flags & NFT_TABLE_F_MASK)) ||
762 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
763 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
765 goto nla_put_failure;
766 if (nft_table_has_owner(table) &&
767 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
768 goto nla_put_failure;
771 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
772 goto nla_put_failure;
779 nlmsg_trim(skb, nlh);
783 struct nftnl_skb_parms {
786 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
788 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
789 struct list_head *notify_list)
791 NFT_CB(skb).report = report;
792 list_add_tail(&skb->list, notify_list);
795 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
797 struct nftables_pernet *nft_net;
803 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
806 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
810 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
811 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
813 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
814 event, flags, ctx->family, ctx->table);
820 nft_net = nft_pernet(ctx->net);
821 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
824 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
827 static int nf_tables_dump_tables(struct sk_buff *skb,
828 struct netlink_callback *cb)
830 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
831 struct nftables_pernet *nft_net;
832 const struct nft_table *table;
833 unsigned int idx = 0, s_idx = cb->args[0];
834 struct net *net = sock_net(skb->sk);
835 int family = nfmsg->nfgen_family;
838 nft_net = nft_pernet(net);
839 cb->seq = READ_ONCE(nft_net->base_seq);
841 list_for_each_entry_rcu(table, &nft_net->tables, list) {
842 if (family != NFPROTO_UNSPEC && family != table->family)
848 memset(&cb->args[1], 0,
849 sizeof(cb->args) - sizeof(cb->args[0]));
850 if (!nft_is_active(net, table))
852 if (nf_tables_fill_table_info(skb, net,
853 NETLINK_CB(cb->skb).portid,
855 NFT_MSG_NEWTABLE, NLM_F_MULTI,
856 table->family, table) < 0)
859 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
869 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
870 const struct nlmsghdr *nlh,
871 struct netlink_dump_control *c)
875 if (!try_module_get(THIS_MODULE))
879 err = netlink_dump_start(nlsk, skb, nlh, c);
881 module_put(THIS_MODULE);
886 /* called with rcu_read_lock held */
887 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
888 const struct nlattr * const nla[])
890 struct netlink_ext_ack *extack = info->extack;
891 u8 genmask = nft_genmask_cur(info->net);
892 u8 family = info->nfmsg->nfgen_family;
893 const struct nft_table *table;
894 struct net *net = info->net;
895 struct sk_buff *skb2;
898 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
899 struct netlink_dump_control c = {
900 .dump = nf_tables_dump_tables,
901 .module = THIS_MODULE,
904 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
907 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
909 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
910 return PTR_ERR(table);
913 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
917 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
918 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
921 goto err_fill_table_info;
923 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
930 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
932 struct nft_chain *chain;
935 list_for_each_entry(chain, &table->chains, list) {
936 if (!nft_is_active_next(net, chain))
938 if (!nft_is_base_chain(chain))
941 if (cnt && i++ == cnt)
944 nf_tables_unregister_hook(net, table, chain);
948 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
950 struct nft_chain *chain;
953 list_for_each_entry(chain, &table->chains, list) {
954 if (!nft_is_active_next(net, chain))
956 if (!nft_is_base_chain(chain))
959 err = nf_tables_register_hook(net, table, chain);
961 goto err_register_hooks;
969 nft_table_disable(net, table, i);
973 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
975 table->flags &= ~NFT_TABLE_F_DORMANT;
976 nft_table_disable(net, table, 0);
977 table->flags |= NFT_TABLE_F_DORMANT;
980 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
981 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
982 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
983 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
984 __NFT_TABLE_F_WAS_AWAKEN)
986 static int nf_tables_updtable(struct nft_ctx *ctx)
988 struct nft_trans *trans;
992 if (!ctx->nla[NFTA_TABLE_FLAGS])
995 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
996 if (flags & ~NFT_TABLE_F_MASK)
999 if (flags == ctx->table->flags)
1002 if ((nft_table_has_owner(ctx->table) &&
1003 !(flags & NFT_TABLE_F_OWNER)) ||
1004 (!nft_table_has_owner(ctx->table) &&
1005 flags & NFT_TABLE_F_OWNER))
1008 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1009 sizeof(struct nft_trans_table));
1013 if ((flags & NFT_TABLE_F_DORMANT) &&
1014 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1015 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1016 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1017 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1018 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1019 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1020 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1021 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1022 ret = nf_tables_table_enable(ctx->net, ctx->table);
1024 goto err_register_hooks;
1026 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1030 nft_trans_table_update(trans) = true;
1031 nft_trans_commit_list_add_tail(ctx->net, trans);
1036 nft_trans_destroy(trans);
1040 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1042 const char *name = data;
1044 return jhash(name, strlen(name), seed);
1047 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1049 const struct nft_chain *chain = data;
1051 return nft_chain_hash(chain->name, 0, seed);
1054 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1057 const struct nft_chain *chain = ptr;
1058 const char *name = arg->key;
1060 return strcmp(chain->name, name);
1063 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1065 const struct nft_object_hash_key *k = data;
1067 seed ^= hash_ptr(k->table, 32);
1069 return jhash(k->name, strlen(k->name), seed);
1072 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1074 const struct nft_object *obj = data;
1076 return nft_objname_hash(&obj->key, 0, seed);
1079 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1082 const struct nft_object_hash_key *k = arg->key;
1083 const struct nft_object *obj = ptr;
1085 if (obj->key.table != k->table)
1088 return strcmp(obj->key.name, k->name);
1091 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1092 const struct nlattr * const nla[])
1094 struct nftables_pernet *nft_net = nft_pernet(info->net);
1095 struct netlink_ext_ack *extack = info->extack;
1096 u8 genmask = nft_genmask_next(info->net);
1097 u8 family = info->nfmsg->nfgen_family;
1098 struct net *net = info->net;
1099 const struct nlattr *attr;
1100 struct nft_table *table;
1105 lockdep_assert_held(&nft_net->commit_mutex);
1106 attr = nla[NFTA_TABLE_NAME];
1107 table = nft_table_lookup(net, attr, family, genmask,
1108 NETLINK_CB(skb).portid);
1109 if (IS_ERR(table)) {
1110 if (PTR_ERR(table) != -ENOENT)
1111 return PTR_ERR(table);
1113 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1114 NL_SET_BAD_ATTR(extack, attr);
1117 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1120 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1122 return nf_tables_updtable(&ctx);
1125 if (nla[NFTA_TABLE_FLAGS]) {
1126 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1127 if (flags & ~NFT_TABLE_F_MASK)
1132 table = kzalloc(sizeof(*table), GFP_KERNEL);
1136 table->name = nla_strdup(attr, GFP_KERNEL);
1137 if (table->name == NULL)
1140 if (nla[NFTA_TABLE_USERDATA]) {
1141 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL);
1142 if (table->udata == NULL)
1143 goto err_table_udata;
1145 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1148 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1152 INIT_LIST_HEAD(&table->chains);
1153 INIT_LIST_HEAD(&table->sets);
1154 INIT_LIST_HEAD(&table->objects);
1155 INIT_LIST_HEAD(&table->flowtables);
1156 table->family = family;
1157 table->flags = flags;
1158 table->handle = ++nft_net->table_handle;
1159 if (table->flags & NFT_TABLE_F_OWNER)
1160 table->nlpid = NETLINK_CB(skb).portid;
1162 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1163 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1167 list_add_tail_rcu(&table->list, &nft_net->tables);
1170 rhltable_destroy(&table->chains_ht);
1172 kfree(table->udata);
1181 static int nft_flush_table(struct nft_ctx *ctx)
1183 struct nft_flowtable *flowtable, *nft;
1184 struct nft_chain *chain, *nc;
1185 struct nft_object *obj, *ne;
1186 struct nft_set *set, *ns;
1189 list_for_each_entry(chain, &ctx->table->chains, list) {
1190 if (!nft_is_active_next(ctx->net, chain))
1193 if (nft_chain_is_bound(chain))
1198 err = nft_delrule_by_chain(ctx);
1203 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1204 if (!nft_is_active_next(ctx->net, set))
1207 if (nft_set_is_anonymous(set) &&
1208 !list_empty(&set->bindings))
1211 err = nft_delset(ctx, set);
1216 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1217 if (!nft_is_active_next(ctx->net, flowtable))
1220 err = nft_delflowtable(ctx, flowtable);
1225 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1226 if (!nft_is_active_next(ctx->net, obj))
1229 err = nft_delobj(ctx, obj);
1234 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1235 if (!nft_is_active_next(ctx->net, chain))
1238 if (nft_chain_is_bound(chain))
1243 err = nft_delchain(ctx);
1248 err = nft_deltable(ctx);
1253 static int nft_flush(struct nft_ctx *ctx, int family)
1255 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1256 const struct nlattr * const *nla = ctx->nla;
1257 struct nft_table *table, *nt;
1260 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1261 if (family != AF_UNSPEC && table->family != family)
1264 ctx->family = table->family;
1266 if (!nft_is_active_next(ctx->net, table))
1269 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1272 if (nla[NFTA_TABLE_NAME] &&
1273 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1278 err = nft_flush_table(ctx);
1286 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1287 const struct nlattr * const nla[])
1289 struct netlink_ext_ack *extack = info->extack;
1290 u8 genmask = nft_genmask_next(info->net);
1291 u8 family = info->nfmsg->nfgen_family;
1292 struct net *net = info->net;
1293 const struct nlattr *attr;
1294 struct nft_table *table;
1297 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1298 if (family == AF_UNSPEC ||
1299 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1300 return nft_flush(&ctx, family);
1302 if (nla[NFTA_TABLE_HANDLE]) {
1303 attr = nla[NFTA_TABLE_HANDLE];
1304 table = nft_table_lookup_byhandle(net, attr, genmask,
1305 NETLINK_CB(skb).portid);
1307 attr = nla[NFTA_TABLE_NAME];
1308 table = nft_table_lookup(net, attr, family, genmask,
1309 NETLINK_CB(skb).portid);
1312 if (IS_ERR(table)) {
1313 NL_SET_BAD_ATTR(extack, attr);
1314 return PTR_ERR(table);
1317 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1321 ctx.family = family;
1324 return nft_flush_table(&ctx);
1327 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1329 if (WARN_ON(ctx->table->use > 0))
1332 rhltable_destroy(&ctx->table->chains_ht);
1333 kfree(ctx->table->name);
1334 kfree(ctx->table->udata);
1338 void nft_register_chain_type(const struct nft_chain_type *ctype)
1340 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1341 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1342 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1345 chain_type[ctype->family][ctype->type] = ctype;
1346 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1348 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1350 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1352 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1353 chain_type[ctype->family][ctype->type] = NULL;
1354 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1356 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1362 static struct nft_chain *
1363 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1365 struct nft_chain *chain;
1367 list_for_each_entry(chain, &table->chains, list) {
1368 if (chain->handle == handle &&
1369 nft_active_genmask(chain, genmask))
1373 return ERR_PTR(-ENOENT);
1376 static bool lockdep_commit_lock_is_held(const struct net *net)
1378 #ifdef CONFIG_PROVE_LOCKING
1379 struct nftables_pernet *nft_net = nft_pernet(net);
1381 return lockdep_is_held(&nft_net->commit_mutex);
1387 static struct nft_chain *nft_chain_lookup(struct net *net,
1388 struct nft_table *table,
1389 const struct nlattr *nla, u8 genmask)
1391 char search[NFT_CHAIN_MAXNAMELEN + 1];
1392 struct rhlist_head *tmp, *list;
1393 struct nft_chain *chain;
1396 return ERR_PTR(-EINVAL);
1398 nla_strscpy(search, nla, sizeof(search));
1400 WARN_ON(!rcu_read_lock_held() &&
1401 !lockdep_commit_lock_is_held(net));
1403 chain = ERR_PTR(-ENOENT);
1405 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1409 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1410 if (nft_active_genmask(chain, genmask))
1413 chain = ERR_PTR(-ENOENT);
1419 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1420 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1421 .len = NFT_TABLE_MAXNAMELEN - 1 },
1422 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1423 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1424 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1425 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1426 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1427 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1428 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1429 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1430 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1431 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1432 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1433 .len = NFT_USERDATA_MAXLEN },
1436 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1437 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1438 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1439 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1440 .len = IFNAMSIZ - 1 },
1443 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1445 struct nft_stats *cpu_stats, total;
1446 struct nlattr *nest;
1454 memset(&total, 0, sizeof(total));
1455 for_each_possible_cpu(cpu) {
1456 cpu_stats = per_cpu_ptr(stats, cpu);
1458 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1459 pkts = cpu_stats->pkts;
1460 bytes = cpu_stats->bytes;
1461 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1463 total.bytes += bytes;
1465 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1467 goto nla_put_failure;
1469 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1470 NFTA_COUNTER_PAD) ||
1471 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1473 goto nla_put_failure;
1475 nla_nest_end(skb, nest);
1482 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1483 const struct nft_base_chain *basechain)
1485 const struct nf_hook_ops *ops = &basechain->ops;
1486 struct nft_hook *hook, *first = NULL;
1487 struct nlattr *nest, *nest_devs;
1490 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1492 goto nla_put_failure;
1493 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1494 goto nla_put_failure;
1495 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1496 goto nla_put_failure;
1498 if (nft_base_chain_netdev(family, ops->hooknum)) {
1499 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1500 list_for_each_entry(hook, &basechain->hook_list, list) {
1504 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1505 hook->ops.dev->name))
1506 goto nla_put_failure;
1509 nla_nest_end(skb, nest_devs);
1512 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1513 goto nla_put_failure;
1515 nla_nest_end(skb, nest);
1522 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1523 u32 portid, u32 seq, int event, u32 flags,
1524 int family, const struct nft_table *table,
1525 const struct nft_chain *chain)
1527 struct nlmsghdr *nlh;
1529 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1530 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1531 NFNETLINK_V0, nft_base_seq(net));
1533 goto nla_put_failure;
1535 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1536 goto nla_put_failure;
1537 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1539 goto nla_put_failure;
1540 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1541 goto nla_put_failure;
1543 if (nft_is_base_chain(chain)) {
1544 const struct nft_base_chain *basechain = nft_base_chain(chain);
1545 struct nft_stats __percpu *stats;
1547 if (nft_dump_basechain_hook(skb, family, basechain))
1548 goto nla_put_failure;
1550 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1551 htonl(basechain->policy)))
1552 goto nla_put_failure;
1554 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1555 goto nla_put_failure;
1557 stats = rcu_dereference_check(basechain->stats,
1558 lockdep_commit_lock_is_held(net));
1559 if (nft_dump_stats(skb, stats))
1560 goto nla_put_failure;
1564 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1565 goto nla_put_failure;
1567 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1568 goto nla_put_failure;
1571 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1572 goto nla_put_failure;
1574 nlmsg_end(skb, nlh);
1578 nlmsg_trim(skb, nlh);
1582 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1584 struct nftables_pernet *nft_net;
1585 struct sk_buff *skb;
1590 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1593 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1597 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1598 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1600 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1601 event, flags, ctx->family, ctx->table,
1608 nft_net = nft_pernet(ctx->net);
1609 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1612 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1615 static int nf_tables_dump_chains(struct sk_buff *skb,
1616 struct netlink_callback *cb)
1618 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1619 unsigned int idx = 0, s_idx = cb->args[0];
1620 struct net *net = sock_net(skb->sk);
1621 int family = nfmsg->nfgen_family;
1622 struct nftables_pernet *nft_net;
1623 const struct nft_table *table;
1624 const struct nft_chain *chain;
1627 nft_net = nft_pernet(net);
1628 cb->seq = READ_ONCE(nft_net->base_seq);
1630 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1631 if (family != NFPROTO_UNSPEC && family != table->family)
1634 list_for_each_entry_rcu(chain, &table->chains, list) {
1638 memset(&cb->args[1], 0,
1639 sizeof(cb->args) - sizeof(cb->args[0]));
1640 if (!nft_is_active(net, chain))
1642 if (nf_tables_fill_chain_info(skb, net,
1643 NETLINK_CB(cb->skb).portid,
1647 table->family, table,
1651 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1662 /* called with rcu_read_lock held */
1663 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1664 const struct nlattr * const nla[])
1666 struct netlink_ext_ack *extack = info->extack;
1667 u8 genmask = nft_genmask_cur(info->net);
1668 u8 family = info->nfmsg->nfgen_family;
1669 const struct nft_chain *chain;
1670 struct net *net = info->net;
1671 struct nft_table *table;
1672 struct sk_buff *skb2;
1675 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1676 struct netlink_dump_control c = {
1677 .dump = nf_tables_dump_chains,
1678 .module = THIS_MODULE,
1681 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1684 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1685 if (IS_ERR(table)) {
1686 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1687 return PTR_ERR(table);
1690 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1691 if (IS_ERR(chain)) {
1692 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1693 return PTR_ERR(chain);
1696 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1700 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1701 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1702 0, family, table, chain);
1704 goto err_fill_chain_info;
1706 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1708 err_fill_chain_info:
1713 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1714 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1715 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1718 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1720 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1721 struct nft_stats __percpu *newstats;
1722 struct nft_stats *stats;
1725 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1726 nft_counter_policy, NULL);
1728 return ERR_PTR(err);
1730 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1731 return ERR_PTR(-EINVAL);
1733 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1734 if (newstats == NULL)
1735 return ERR_PTR(-ENOMEM);
1737 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1738 * are not exposed to userspace.
1741 stats = this_cpu_ptr(newstats);
1742 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1743 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1749 static void nft_chain_stats_replace(struct nft_trans *trans)
1751 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1753 if (!nft_trans_chain_stats(trans))
1756 nft_trans_chain_stats(trans) =
1757 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1758 lockdep_commit_lock_is_held(trans->ctx.net));
1760 if (!nft_trans_chain_stats(trans))
1761 static_branch_inc(&nft_counters_enabled);
1764 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1766 struct nft_rule **g0 = rcu_dereference_raw(chain->rules_gen_0);
1767 struct nft_rule **g1 = rcu_dereference_raw(chain->rules_gen_1);
1773 /* should be NULL either via abort or via successful commit */
1774 WARN_ON_ONCE(chain->rules_next);
1775 kvfree(chain->rules_next);
1778 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1780 struct nft_chain *chain = ctx->chain;
1781 struct nft_hook *hook, *next;
1783 if (WARN_ON(chain->use > 0))
1786 /* no concurrent access possible anymore */
1787 nf_tables_chain_free_chain_rules(chain);
1789 if (nft_is_base_chain(chain)) {
1790 struct nft_base_chain *basechain = nft_base_chain(chain);
1792 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1793 list_for_each_entry_safe(hook, next,
1794 &basechain->hook_list, list) {
1795 list_del_rcu(&hook->list);
1796 kfree_rcu(hook, rcu);
1799 module_put(basechain->type->owner);
1800 if (rcu_access_pointer(basechain->stats)) {
1801 static_branch_dec(&nft_counters_enabled);
1802 free_percpu(rcu_dereference_raw(basechain->stats));
1805 kfree(chain->udata);
1809 kfree(chain->udata);
1814 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1815 const struct nlattr *attr)
1817 struct net_device *dev;
1818 char ifname[IFNAMSIZ];
1819 struct nft_hook *hook;
1822 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL);
1825 goto err_hook_alloc;
1828 nla_strscpy(ifname, attr, IFNAMSIZ);
1829 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1830 * indirectly serializing all the other holders of the commit_mutex with
1833 dev = __dev_get_by_name(net, ifname);
1838 hook->ops.dev = dev;
1845 return ERR_PTR(err);
1848 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1849 const struct nft_hook *this)
1851 struct nft_hook *hook;
1853 list_for_each_entry(hook, hook_list, list) {
1854 if (this->ops.dev == hook->ops.dev)
1861 static int nf_tables_parse_netdev_hooks(struct net *net,
1862 const struct nlattr *attr,
1863 struct list_head *hook_list)
1865 struct nft_hook *hook, *next;
1866 const struct nlattr *tmp;
1867 int rem, n = 0, err;
1869 nla_for_each_nested(tmp, attr, rem) {
1870 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1875 hook = nft_netdev_hook_alloc(net, tmp);
1877 err = PTR_ERR(hook);
1880 if (nft_hook_list_find(hook_list, hook)) {
1885 list_add_tail(&hook->list, hook_list);
1888 if (n == NFT_NETDEVICE_MAX) {
1897 list_for_each_entry_safe(hook, next, hook_list, list) {
1898 list_del(&hook->list);
1904 struct nft_chain_hook {
1907 const struct nft_chain_type *type;
1908 struct list_head list;
1911 static int nft_chain_parse_netdev(struct net *net,
1912 struct nlattr *tb[],
1913 struct list_head *hook_list)
1915 struct nft_hook *hook;
1918 if (tb[NFTA_HOOK_DEV]) {
1919 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
1921 return PTR_ERR(hook);
1923 list_add_tail(&hook->list, hook_list);
1924 } else if (tb[NFTA_HOOK_DEVS]) {
1925 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
1930 if (list_empty(hook_list))
1939 static int nft_chain_parse_hook(struct net *net,
1940 const struct nlattr * const nla[],
1941 struct nft_chain_hook *hook, u8 family,
1942 struct netlink_ext_ack *extack, bool autoload)
1944 struct nftables_pernet *nft_net = nft_pernet(net);
1945 struct nlattr *ha[NFTA_HOOK_MAX + 1];
1946 const struct nft_chain_type *type;
1949 lockdep_assert_held(&nft_net->commit_mutex);
1950 lockdep_nfnl_nft_mutex_not_held();
1952 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
1953 nla[NFTA_CHAIN_HOOK],
1954 nft_hook_policy, NULL);
1958 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
1959 ha[NFTA_HOOK_PRIORITY] == NULL)
1962 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
1963 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
1965 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
1969 if (nla[NFTA_CHAIN_TYPE]) {
1970 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
1973 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1974 return PTR_ERR(type);
1977 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
1980 if (type->type == NFT_CHAIN_T_NAT &&
1981 hook->priority <= NF_IP_PRI_CONNTRACK)
1984 if (!try_module_get(type->owner)) {
1985 if (nla[NFTA_CHAIN_TYPE])
1986 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
1992 INIT_LIST_HEAD(&hook->list);
1993 if (nft_base_chain_netdev(family, hook->num)) {
1994 err = nft_chain_parse_netdev(net, ha, &hook->list);
1996 module_put(type->owner);
1999 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2000 module_put(type->owner);
2007 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2009 struct nft_hook *h, *next;
2011 list_for_each_entry_safe(h, next, &hook->list, list) {
2015 module_put(hook->type->owner);
2018 struct nft_rules_old {
2020 struct nft_rule **start;
2023 static struct nft_rule **nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2026 if (alloc > INT_MAX)
2029 alloc += 1; /* NULL, ends rules */
2030 if (sizeof(struct nft_rule *) > INT_MAX / alloc)
2033 alloc *= sizeof(struct nft_rule *);
2034 alloc += sizeof(struct nft_rules_old);
2036 return kvmalloc(alloc, GFP_KERNEL);
2039 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2040 const struct nft_chain_hook *hook,
2041 struct nft_chain *chain)
2044 ops->hooknum = hook->num;
2045 ops->priority = hook->priority;
2047 ops->hook = hook->type->hooks[ops->hooknum];
2048 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2051 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2052 struct nft_chain_hook *hook, u32 flags)
2054 struct nft_chain *chain;
2057 basechain->type = hook->type;
2058 INIT_LIST_HEAD(&basechain->hook_list);
2059 chain = &basechain->chain;
2061 if (nft_base_chain_netdev(family, hook->num)) {
2062 list_splice_init(&hook->list, &basechain->hook_list);
2063 list_for_each_entry(h, &basechain->hook_list, list)
2064 nft_basechain_hook_init(&h->ops, family, hook, chain);
2066 basechain->ops.hooknum = hook->num;
2067 basechain->ops.priority = hook->priority;
2069 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2072 chain->flags |= NFT_CHAIN_BASE | flags;
2073 basechain->policy = NF_ACCEPT;
2074 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2075 !nft_chain_offload_support(basechain)) {
2076 list_splice_init(&basechain->hook_list, &hook->list);
2080 flow_block_init(&basechain->flow_block);
2085 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2089 err = rhltable_insert_key(&table->chains_ht, chain->name,
2090 &chain->rhlhead, nft_chain_ht_params);
2094 list_add_tail_rcu(&chain->list, &table->chains);
2099 static u64 chain_id;
2101 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2102 u8 policy, u32 flags,
2103 struct netlink_ext_ack *extack)
2105 const struct nlattr * const *nla = ctx->nla;
2106 struct nft_stats __percpu *stats = NULL;
2107 struct nft_table *table = ctx->table;
2108 struct nft_base_chain *basechain;
2109 struct net *net = ctx->net;
2110 char name[NFT_NAME_MAXLEN];
2111 struct nft_trans *trans;
2112 struct nft_chain *chain;
2113 struct nft_rule **rules;
2116 if (table->use == UINT_MAX)
2119 if (nla[NFTA_CHAIN_HOOK]) {
2120 struct nft_chain_hook hook;
2122 if (flags & NFT_CHAIN_BINDING)
2125 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2130 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
2131 if (basechain == NULL) {
2132 nft_chain_release_hook(&hook);
2135 chain = &basechain->chain;
2137 if (nla[NFTA_CHAIN_COUNTERS]) {
2138 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2139 if (IS_ERR(stats)) {
2140 nft_chain_release_hook(&hook);
2142 return PTR_ERR(stats);
2144 rcu_assign_pointer(basechain->stats, stats);
2147 err = nft_basechain_init(basechain, family, &hook, flags);
2149 nft_chain_release_hook(&hook);
2154 if (flags & NFT_CHAIN_BASE)
2156 if (flags & NFT_CHAIN_HW_OFFLOAD)
2159 chain = kzalloc(sizeof(*chain), GFP_KERNEL);
2163 chain->flags = flags;
2167 INIT_LIST_HEAD(&chain->rules);
2168 chain->handle = nf_tables_alloc_handle(table);
2169 chain->table = table;
2171 if (nla[NFTA_CHAIN_NAME]) {
2172 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2174 if (!(flags & NFT_CHAIN_BINDING)) {
2176 goto err_destroy_chain;
2179 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2180 chain->name = kstrdup(name, GFP_KERNEL);
2185 goto err_destroy_chain;
2188 if (nla[NFTA_CHAIN_USERDATA]) {
2189 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL);
2190 if (chain->udata == NULL) {
2192 goto err_destroy_chain;
2194 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2197 rules = nf_tables_chain_alloc_rules(chain, 0);
2200 goto err_destroy_chain;
2204 rcu_assign_pointer(chain->rules_gen_0, rules);
2205 rcu_assign_pointer(chain->rules_gen_1, rules);
2207 err = nf_tables_register_hook(net, table, chain);
2209 goto err_destroy_chain;
2211 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2212 if (IS_ERR(trans)) {
2213 err = PTR_ERR(trans);
2214 goto err_unregister_hook;
2217 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2218 if (nft_is_base_chain(chain))
2219 nft_trans_chain_policy(trans) = policy;
2221 err = nft_chain_add(table, chain);
2223 nft_trans_destroy(trans);
2224 goto err_unregister_hook;
2228 static_branch_inc(&nft_counters_enabled);
2233 err_unregister_hook:
2234 nf_tables_unregister_hook(net, table, chain);
2236 nf_tables_chain_destroy(ctx);
2241 static bool nft_hook_list_equal(struct list_head *hook_list1,
2242 struct list_head *hook_list2)
2244 struct nft_hook *hook;
2248 list_for_each_entry(hook, hook_list2, list) {
2249 if (!nft_hook_list_find(hook_list1, hook))
2254 list_for_each_entry(hook, hook_list1, list)
2260 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2261 u32 flags, const struct nlattr *attr,
2262 struct netlink_ext_ack *extack)
2264 const struct nlattr * const *nla = ctx->nla;
2265 struct nft_table *table = ctx->table;
2266 struct nft_chain *chain = ctx->chain;
2267 struct nft_base_chain *basechain;
2268 struct nft_stats *stats = NULL;
2269 struct nft_chain_hook hook;
2270 struct nf_hook_ops *ops;
2271 struct nft_trans *trans;
2274 if (chain->flags ^ flags)
2277 if (nla[NFTA_CHAIN_HOOK]) {
2278 if (!nft_is_base_chain(chain)) {
2279 NL_SET_BAD_ATTR(extack, attr);
2282 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2287 basechain = nft_base_chain(chain);
2288 if (basechain->type != hook.type) {
2289 nft_chain_release_hook(&hook);
2290 NL_SET_BAD_ATTR(extack, attr);
2294 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2295 if (!nft_hook_list_equal(&basechain->hook_list,
2297 nft_chain_release_hook(&hook);
2298 NL_SET_BAD_ATTR(extack, attr);
2302 ops = &basechain->ops;
2303 if (ops->hooknum != hook.num ||
2304 ops->priority != hook.priority) {
2305 nft_chain_release_hook(&hook);
2306 NL_SET_BAD_ATTR(extack, attr);
2310 nft_chain_release_hook(&hook);
2313 if (nla[NFTA_CHAIN_HANDLE] &&
2314 nla[NFTA_CHAIN_NAME]) {
2315 struct nft_chain *chain2;
2317 chain2 = nft_chain_lookup(ctx->net, table,
2318 nla[NFTA_CHAIN_NAME], genmask);
2319 if (!IS_ERR(chain2)) {
2320 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2325 if (nla[NFTA_CHAIN_COUNTERS]) {
2326 if (!nft_is_base_chain(chain))
2329 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2331 return PTR_ERR(stats);
2335 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2336 sizeof(struct nft_trans_chain));
2340 nft_trans_chain_stats(trans) = stats;
2341 nft_trans_chain_update(trans) = true;
2343 if (nla[NFTA_CHAIN_POLICY])
2344 nft_trans_chain_policy(trans) = policy;
2346 nft_trans_chain_policy(trans) = -1;
2348 if (nla[NFTA_CHAIN_HANDLE] &&
2349 nla[NFTA_CHAIN_NAME]) {
2350 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2351 struct nft_trans *tmp;
2355 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL);
2360 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2361 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2362 tmp->ctx.table == table &&
2363 nft_trans_chain_update(tmp) &&
2364 nft_trans_chain_name(tmp) &&
2365 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2366 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2372 nft_trans_chain_name(trans) = name;
2374 nft_trans_commit_list_add_tail(ctx->net, trans);
2383 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2384 const struct nft_table *table,
2385 const struct nlattr *nla)
2387 struct nftables_pernet *nft_net = nft_pernet(net);
2388 u32 id = ntohl(nla_get_be32(nla));
2389 struct nft_trans *trans;
2391 list_for_each_entry(trans, &nft_net->commit_list, list) {
2392 struct nft_chain *chain = trans->ctx.chain;
2394 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2395 chain->table == table &&
2396 id == nft_trans_chain_id(trans))
2399 return ERR_PTR(-ENOENT);
2402 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2403 const struct nlattr * const nla[])
2405 struct nftables_pernet *nft_net = nft_pernet(info->net);
2406 struct netlink_ext_ack *extack = info->extack;
2407 u8 genmask = nft_genmask_next(info->net);
2408 u8 family = info->nfmsg->nfgen_family;
2409 struct nft_chain *chain = NULL;
2410 struct net *net = info->net;
2411 const struct nlattr *attr;
2412 struct nft_table *table;
2413 u8 policy = NF_ACCEPT;
2418 lockdep_assert_held(&nft_net->commit_mutex);
2420 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2421 NETLINK_CB(skb).portid);
2422 if (IS_ERR(table)) {
2423 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2424 return PTR_ERR(table);
2428 attr = nla[NFTA_CHAIN_NAME];
2430 if (nla[NFTA_CHAIN_HANDLE]) {
2431 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2432 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2433 if (IS_ERR(chain)) {
2434 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2435 return PTR_ERR(chain);
2437 attr = nla[NFTA_CHAIN_HANDLE];
2438 } else if (nla[NFTA_CHAIN_NAME]) {
2439 chain = nft_chain_lookup(net, table, attr, genmask);
2440 if (IS_ERR(chain)) {
2441 if (PTR_ERR(chain) != -ENOENT) {
2442 NL_SET_BAD_ATTR(extack, attr);
2443 return PTR_ERR(chain);
2447 } else if (!nla[NFTA_CHAIN_ID]) {
2451 if (nla[NFTA_CHAIN_POLICY]) {
2452 if (chain != NULL &&
2453 !nft_is_base_chain(chain)) {
2454 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2458 if (chain == NULL &&
2459 nla[NFTA_CHAIN_HOOK] == NULL) {
2460 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2464 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2474 if (nla[NFTA_CHAIN_FLAGS])
2475 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2477 flags = chain->flags;
2479 if (flags & ~NFT_CHAIN_FLAGS)
2482 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2484 if (chain != NULL) {
2485 if (chain->flags & NFT_CHAIN_BINDING)
2488 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2489 NL_SET_BAD_ATTR(extack, attr);
2492 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2495 flags |= chain->flags & NFT_CHAIN_BASE;
2496 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2500 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2503 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2504 const struct nlattr * const nla[])
2506 struct netlink_ext_ack *extack = info->extack;
2507 u8 genmask = nft_genmask_next(info->net);
2508 u8 family = info->nfmsg->nfgen_family;
2509 struct net *net = info->net;
2510 const struct nlattr *attr;
2511 struct nft_table *table;
2512 struct nft_chain *chain;
2513 struct nft_rule *rule;
2519 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2520 NETLINK_CB(skb).portid);
2521 if (IS_ERR(table)) {
2522 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2523 return PTR_ERR(table);
2526 if (nla[NFTA_CHAIN_HANDLE]) {
2527 attr = nla[NFTA_CHAIN_HANDLE];
2528 handle = be64_to_cpu(nla_get_be64(attr));
2529 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2531 attr = nla[NFTA_CHAIN_NAME];
2532 chain = nft_chain_lookup(net, table, attr, genmask);
2534 if (IS_ERR(chain)) {
2535 NL_SET_BAD_ATTR(extack, attr);
2536 return PTR_ERR(chain);
2539 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2543 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2546 list_for_each_entry(rule, &chain->rules, list) {
2547 if (!nft_is_active_next(net, rule))
2551 err = nft_delrule(&ctx, rule);
2556 /* There are rules and elements that are still holding references to us,
2557 * we cannot do a recursive removal in this case.
2560 NL_SET_BAD_ATTR(extack, attr);
2564 return nft_delchain(&ctx);
2572 * nft_register_expr - register nf_tables expr type
2575 * Registers the expr type for use with nf_tables. Returns zero on
2576 * success or a negative errno code otherwise.
2578 int nft_register_expr(struct nft_expr_type *type)
2580 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2581 if (type->family == NFPROTO_UNSPEC)
2582 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2584 list_add_rcu(&type->list, &nf_tables_expressions);
2585 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2588 EXPORT_SYMBOL_GPL(nft_register_expr);
2591 * nft_unregister_expr - unregister nf_tables expr type
2594 * Unregisters the expr typefor use with nf_tables.
2596 void nft_unregister_expr(struct nft_expr_type *type)
2598 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2599 list_del_rcu(&type->list);
2600 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2602 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2604 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2607 const struct nft_expr_type *type, *candidate = NULL;
2609 list_for_each_entry(type, &nf_tables_expressions, list) {
2610 if (!nla_strcmp(nla, type->name)) {
2611 if (!type->family && !candidate)
2613 else if (type->family == family)
2620 #ifdef CONFIG_MODULES
2621 static int nft_expr_type_request_module(struct net *net, u8 family,
2624 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2625 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2632 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2636 const struct nft_expr_type *type;
2639 return ERR_PTR(-EINVAL);
2641 type = __nft_expr_type_get(family, nla);
2642 if (type != NULL && try_module_get(type->owner))
2645 lockdep_nfnl_nft_mutex_not_held();
2646 #ifdef CONFIG_MODULES
2648 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2649 return ERR_PTR(-EAGAIN);
2651 if (nft_request_module(net, "nft-expr-%.*s",
2653 (char *)nla_data(nla)) == -EAGAIN)
2654 return ERR_PTR(-EAGAIN);
2657 return ERR_PTR(-ENOENT);
2660 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2661 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2662 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2663 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2666 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2667 const struct nft_expr *expr)
2669 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2670 goto nla_put_failure;
2672 if (expr->ops->dump) {
2673 struct nlattr *data = nla_nest_start_noflag(skb,
2676 goto nla_put_failure;
2677 if (expr->ops->dump(skb, expr) < 0)
2678 goto nla_put_failure;
2679 nla_nest_end(skb, data);
2688 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2689 const struct nft_expr *expr)
2691 struct nlattr *nest;
2693 nest = nla_nest_start_noflag(skb, attr);
2695 goto nla_put_failure;
2696 if (nf_tables_fill_expr_info(skb, expr) < 0)
2697 goto nla_put_failure;
2698 nla_nest_end(skb, nest);
2705 struct nft_expr_info {
2706 const struct nft_expr_ops *ops;
2707 const struct nlattr *attr;
2708 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2711 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2712 const struct nlattr *nla,
2713 struct nft_expr_info *info)
2715 const struct nft_expr_type *type;
2716 const struct nft_expr_ops *ops;
2717 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2720 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2721 nft_expr_policy, NULL);
2725 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2727 return PTR_ERR(type);
2729 if (tb[NFTA_EXPR_DATA]) {
2730 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2732 type->policy, NULL);
2736 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2738 if (type->select_ops != NULL) {
2739 ops = type->select_ops(ctx,
2740 (const struct nlattr * const *)info->tb);
2743 #ifdef CONFIG_MODULES
2745 if (nft_expr_type_request_module(ctx->net,
2747 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2761 module_put(type->owner);
2765 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2766 const struct nft_expr_info *expr_info,
2767 struct nft_expr *expr)
2769 const struct nft_expr_ops *ops = expr_info->ops;
2774 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2785 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2786 struct nft_expr *expr)
2788 const struct nft_expr_type *type = expr->ops->type;
2790 if (expr->ops->destroy)
2791 expr->ops->destroy(ctx, expr);
2792 module_put(type->owner);
2795 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2796 const struct nlattr *nla)
2798 struct nft_expr_info expr_info;
2799 struct nft_expr *expr;
2800 struct module *owner;
2803 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2805 goto err_expr_parse;
2808 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2809 goto err_expr_stateful;
2812 expr = kzalloc(expr_info.ops->size, GFP_KERNEL);
2814 goto err_expr_stateful;
2816 err = nf_tables_newexpr(ctx, &expr_info, expr);
2824 owner = expr_info.ops->type->owner;
2825 if (expr_info.ops->type->release_ops)
2826 expr_info.ops->type->release_ops(expr_info.ops);
2830 return ERR_PTR(err);
2833 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2837 if (src->ops->clone) {
2838 dst->ops = src->ops;
2839 err = src->ops->clone(dst, src);
2843 memcpy(dst, src, src->ops->size);
2846 __module_get(src->ops->type->owner);
2851 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2853 nf_tables_expr_destroy(ctx, expr);
2861 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2864 struct nft_rule *rule;
2866 // FIXME: this sucks
2867 list_for_each_entry_rcu(rule, &chain->rules, list) {
2868 if (handle == rule->handle)
2872 return ERR_PTR(-ENOENT);
2875 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2876 const struct nlattr *nla)
2879 return ERR_PTR(-EINVAL);
2881 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2884 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2885 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2886 .len = NFT_TABLE_MAXNAMELEN - 1 },
2887 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2888 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2889 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2890 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2891 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2892 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2893 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2894 .len = NFT_USERDATA_MAXLEN },
2895 [NFTA_RULE_ID] = { .type = NLA_U32 },
2896 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2897 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2900 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2901 u32 portid, u32 seq, int event,
2902 u32 flags, int family,
2903 const struct nft_table *table,
2904 const struct nft_chain *chain,
2905 const struct nft_rule *rule, u64 handle)
2907 struct nlmsghdr *nlh;
2908 const struct nft_expr *expr, *next;
2909 struct nlattr *list;
2910 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2912 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
2915 goto nla_put_failure;
2917 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
2918 goto nla_put_failure;
2919 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
2920 goto nla_put_failure;
2921 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
2923 goto nla_put_failure;
2925 if (event != NFT_MSG_DELRULE && handle) {
2926 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
2928 goto nla_put_failure;
2931 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2932 nft_flow_rule_stats(chain, rule);
2934 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
2936 goto nla_put_failure;
2937 nft_rule_for_each_expr(expr, next, rule) {
2938 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
2939 goto nla_put_failure;
2941 nla_nest_end(skb, list);
2944 struct nft_userdata *udata = nft_userdata(rule);
2945 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
2947 goto nla_put_failure;
2950 nlmsg_end(skb, nlh);
2954 nlmsg_trim(skb, nlh);
2958 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
2959 const struct nft_rule *rule, int event)
2961 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2962 const struct nft_rule *prule;
2963 struct sk_buff *skb;
2969 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
2972 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2976 if (event == NFT_MSG_NEWRULE &&
2977 !list_is_first(&rule->list, &ctx->chain->rules) &&
2978 !list_is_last(&rule->list, &ctx->chain->rules)) {
2979 prule = list_prev_entry(rule, list);
2980 handle = prule->handle;
2982 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
2983 flags |= NLM_F_APPEND;
2984 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
2985 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
2987 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
2988 event, flags, ctx->family, ctx->table,
2989 ctx->chain, rule, handle);
2995 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
2998 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3001 struct nft_rule_dump_ctx {
3006 static int __nf_tables_dump_rules(struct sk_buff *skb,
3008 struct netlink_callback *cb,
3009 const struct nft_table *table,
3010 const struct nft_chain *chain)
3012 struct net *net = sock_net(skb->sk);
3013 const struct nft_rule *rule, *prule;
3014 unsigned int s_idx = cb->args[0];
3018 list_for_each_entry_rcu(rule, &chain->rules, list) {
3019 if (!nft_is_active(net, rule))
3024 memset(&cb->args[1], 0,
3025 sizeof(cb->args) - sizeof(cb->args[0]));
3028 handle = prule->handle;
3032 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3035 NLM_F_MULTI | NLM_F_APPEND,
3037 table, chain, rule, handle) < 0)
3040 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3049 static int nf_tables_dump_rules(struct sk_buff *skb,
3050 struct netlink_callback *cb)
3052 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3053 const struct nft_rule_dump_ctx *ctx = cb->data;
3054 struct nft_table *table;
3055 const struct nft_chain *chain;
3056 unsigned int idx = 0;
3057 struct net *net = sock_net(skb->sk);
3058 int family = nfmsg->nfgen_family;
3059 struct nftables_pernet *nft_net;
3062 nft_net = nft_pernet(net);
3063 cb->seq = READ_ONCE(nft_net->base_seq);
3065 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3066 if (family != NFPROTO_UNSPEC && family != table->family)
3069 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3072 if (ctx && ctx->table && ctx->chain) {
3073 struct rhlist_head *list, *tmp;
3075 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3076 nft_chain_ht_params);
3080 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3081 if (!nft_is_active(net, chain))
3083 __nf_tables_dump_rules(skb, &idx,
3090 list_for_each_entry_rcu(chain, &table->chains, list) {
3091 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3095 if (ctx && ctx->table)
3105 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3107 const struct nlattr * const *nla = cb->data;
3108 struct nft_rule_dump_ctx *ctx = NULL;
3110 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3111 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3115 if (nla[NFTA_RULE_TABLE]) {
3116 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3123 if (nla[NFTA_RULE_CHAIN]) {
3124 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3138 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3140 struct nft_rule_dump_ctx *ctx = cb->data;
3150 /* called with rcu_read_lock held */
3151 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3152 const struct nlattr * const nla[])
3154 struct netlink_ext_ack *extack = info->extack;
3155 u8 genmask = nft_genmask_cur(info->net);
3156 u8 family = info->nfmsg->nfgen_family;
3157 const struct nft_chain *chain;
3158 const struct nft_rule *rule;
3159 struct net *net = info->net;
3160 struct nft_table *table;
3161 struct sk_buff *skb2;
3164 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3165 struct netlink_dump_control c = {
3166 .start= nf_tables_dump_rules_start,
3167 .dump = nf_tables_dump_rules,
3168 .done = nf_tables_dump_rules_done,
3169 .module = THIS_MODULE,
3170 .data = (void *)nla,
3173 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3176 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3177 if (IS_ERR(table)) {
3178 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3179 return PTR_ERR(table);
3182 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3183 if (IS_ERR(chain)) {
3184 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3185 return PTR_ERR(chain);
3188 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3190 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3191 return PTR_ERR(rule);
3194 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3198 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3199 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3200 family, table, chain, rule, 0);
3202 goto err_fill_rule_info;
3204 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3211 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3212 struct nft_rule *rule)
3214 struct nft_expr *expr, *next;
3217 * Careful: some expressions might not be initialized in case this
3218 * is called on error from nf_tables_newrule().
3220 expr = nft_expr_first(rule);
3221 while (nft_expr_more(rule, expr)) {
3222 next = nft_expr_next(expr);
3223 nf_tables_expr_destroy(ctx, expr);
3229 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3231 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3232 nf_tables_rule_destroy(ctx, rule);
3235 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3237 struct nft_expr *expr, *last;
3238 const struct nft_data *data;
3239 struct nft_rule *rule;
3242 if (ctx->level == NFT_JUMP_STACK_SIZE)
3245 list_for_each_entry(rule, &chain->rules, list) {
3246 if (!nft_is_active_next(ctx->net, rule))
3249 nft_rule_for_each_expr(expr, last, rule) {
3250 if (!expr->ops->validate)
3253 err = expr->ops->validate(ctx, expr, &data);
3261 EXPORT_SYMBOL_GPL(nft_chain_validate);
3263 static int nft_table_validate(struct net *net, const struct nft_table *table)
3265 struct nft_chain *chain;
3266 struct nft_ctx ctx = {
3268 .family = table->family,
3272 list_for_each_entry(chain, &table->chains, list) {
3273 if (!nft_is_base_chain(chain))
3277 err = nft_chain_validate(&ctx, chain);
3285 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3286 const struct nft_chain *chain,
3287 const struct nlattr *nla);
3289 #define NFT_RULE_MAXEXPRS 128
3291 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3292 const struct nlattr * const nla[])
3294 struct nftables_pernet *nft_net = nft_pernet(info->net);
3295 struct netlink_ext_ack *extack = info->extack;
3296 unsigned int size, i, n, ulen = 0, usize = 0;
3297 u8 genmask = nft_genmask_next(info->net);
3298 struct nft_rule *rule, *old_rule = NULL;
3299 struct nft_expr_info *expr_info = NULL;
3300 u8 family = info->nfmsg->nfgen_family;
3301 struct nft_flow_rule *flow = NULL;
3302 struct net *net = info->net;
3303 struct nft_userdata *udata;
3304 struct nft_table *table;
3305 struct nft_chain *chain;
3306 struct nft_trans *trans;
3307 u64 handle, pos_handle;
3308 struct nft_expr *expr;
3313 lockdep_assert_held(&nft_net->commit_mutex);
3315 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3316 NETLINK_CB(skb).portid);
3317 if (IS_ERR(table)) {
3318 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3319 return PTR_ERR(table);
3322 if (nla[NFTA_RULE_CHAIN]) {
3323 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3325 if (IS_ERR(chain)) {
3326 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3327 return PTR_ERR(chain);
3329 if (nft_chain_is_bound(chain))
3332 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3333 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3334 if (IS_ERR(chain)) {
3335 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3336 return PTR_ERR(chain);
3342 if (nla[NFTA_RULE_HANDLE]) {
3343 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3344 rule = __nft_rule_lookup(chain, handle);
3346 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3347 return PTR_ERR(rule);
3350 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3351 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3354 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3359 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3360 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3362 handle = nf_tables_alloc_handle(table);
3364 if (chain->use == UINT_MAX)
3367 if (nla[NFTA_RULE_POSITION]) {
3368 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3369 old_rule = __nft_rule_lookup(chain, pos_handle);
3370 if (IS_ERR(old_rule)) {
3371 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3372 return PTR_ERR(old_rule);
3374 } else if (nla[NFTA_RULE_POSITION_ID]) {
3375 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3376 if (IS_ERR(old_rule)) {
3377 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3378 return PTR_ERR(old_rule);
3383 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3387 if (nla[NFTA_RULE_EXPRESSIONS]) {
3388 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3389 sizeof(struct nft_expr_info),
3394 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3396 if (nla_type(tmp) != NFTA_LIST_ELEM)
3397 goto err_release_expr;
3398 if (n == NFT_RULE_MAXEXPRS)
3399 goto err_release_expr;
3400 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3402 NL_SET_BAD_ATTR(extack, tmp);
3403 goto err_release_expr;
3405 size += expr_info[n].ops->size;
3409 /* Check for overflow of dlen field */
3411 if (size >= 1 << 12)
3412 goto err_release_expr;
3414 if (nla[NFTA_RULE_USERDATA]) {
3415 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3417 usize = sizeof(struct nft_userdata) + ulen;
3421 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL);
3423 goto err_release_expr;
3425 nft_activate_next(net, rule);
3427 rule->handle = handle;
3429 rule->udata = ulen ? 1 : 0;
3432 udata = nft_userdata(rule);
3433 udata->len = ulen - 1;
3434 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3437 expr = nft_expr_first(rule);
3438 for (i = 0; i < n; i++) {
3439 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3441 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3442 goto err_release_rule;
3445 if (expr_info[i].ops->validate)
3446 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3448 expr_info[i].ops = NULL;
3449 expr = nft_expr_next(expr);
3452 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3453 flow = nft_flow_rule_create(net, rule);
3455 err = PTR_ERR(flow);
3456 goto err_release_rule;
3460 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3461 err = nft_delrule(&ctx, old_rule);
3463 goto err_destroy_flow_rule;
3465 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3466 if (trans == NULL) {
3468 goto err_destroy_flow_rule;
3470 list_add_tail_rcu(&rule->list, &old_rule->list);
3472 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3475 goto err_destroy_flow_rule;
3478 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3480 list_add_rcu(&rule->list, &old_rule->list);
3482 list_add_tail_rcu(&rule->list, &chain->rules);
3485 list_add_tail_rcu(&rule->list, &old_rule->list);
3487 list_add_rcu(&rule->list, &chain->rules);
3494 nft_trans_flow_rule(trans) = flow;
3496 if (nft_net->validate_state == NFT_VALIDATE_DO)
3497 return nft_table_validate(net, table);
3501 err_destroy_flow_rule:
3503 nft_flow_rule_destroy(flow);
3505 nf_tables_rule_release(&ctx, rule);
3507 for (i = 0; i < n; i++) {
3508 if (expr_info[i].ops) {
3509 module_put(expr_info[i].ops->type->owner);
3510 if (expr_info[i].ops->type->release_ops)
3511 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3519 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3520 const struct nft_chain *chain,
3521 const struct nlattr *nla)
3523 struct nftables_pernet *nft_net = nft_pernet(net);
3524 u32 id = ntohl(nla_get_be32(nla));
3525 struct nft_trans *trans;
3527 list_for_each_entry(trans, &nft_net->commit_list, list) {
3528 struct nft_rule *rule = nft_trans_rule(trans);
3530 if (trans->msg_type == NFT_MSG_NEWRULE &&
3531 trans->ctx.chain == chain &&
3532 id == nft_trans_rule_id(trans))
3535 return ERR_PTR(-ENOENT);
3538 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3539 const struct nlattr * const nla[])
3541 struct netlink_ext_ack *extack = info->extack;
3542 u8 genmask = nft_genmask_next(info->net);
3543 u8 family = info->nfmsg->nfgen_family;
3544 struct nft_chain *chain = NULL;
3545 struct net *net = info->net;
3546 struct nft_table *table;
3547 struct nft_rule *rule;
3551 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3552 NETLINK_CB(skb).portid);
3553 if (IS_ERR(table)) {
3554 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3555 return PTR_ERR(table);
3558 if (nla[NFTA_RULE_CHAIN]) {
3559 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3561 if (IS_ERR(chain)) {
3562 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3563 return PTR_ERR(chain);
3565 if (nft_chain_is_bound(chain))
3569 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3572 if (nla[NFTA_RULE_HANDLE]) {
3573 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3575 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3576 return PTR_ERR(rule);
3579 err = nft_delrule(&ctx, rule);
3580 } else if (nla[NFTA_RULE_ID]) {
3581 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3583 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3584 return PTR_ERR(rule);
3587 err = nft_delrule(&ctx, rule);
3589 err = nft_delrule_by_chain(&ctx);
3592 list_for_each_entry(chain, &table->chains, list) {
3593 if (!nft_is_active_next(net, chain))
3597 err = nft_delrule_by_chain(&ctx);
3609 static const struct nft_set_type *nft_set_types[] = {
3610 &nft_set_hash_fast_type,
3612 &nft_set_rhash_type,
3613 &nft_set_bitmap_type,
3614 &nft_set_rbtree_type,
3615 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3616 &nft_set_pipapo_avx2_type,
3618 &nft_set_pipapo_type,
3621 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3622 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3625 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3627 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3631 * Select a set implementation based on the data characteristics and the
3632 * given policy. The total memory use might not be known if no size is
3633 * given, in that case the amount of memory per element is used.
3635 static const struct nft_set_ops *
3636 nft_select_set_ops(const struct nft_ctx *ctx,
3637 const struct nlattr * const nla[],
3638 const struct nft_set_desc *desc,
3639 enum nft_set_policies policy)
3641 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3642 const struct nft_set_ops *ops, *bops;
3643 struct nft_set_estimate est, best;
3644 const struct nft_set_type *type;
3648 lockdep_assert_held(&nft_net->commit_mutex);
3649 lockdep_nfnl_nft_mutex_not_held();
3651 if (nla[NFTA_SET_FLAGS] != NULL)
3652 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3659 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3660 type = nft_set_types[i];
3663 if (!nft_set_ops_candidate(type, flags))
3665 if (!ops->estimate(desc, flags, &est))
3669 case NFT_SET_POL_PERFORMANCE:
3670 if (est.lookup < best.lookup)
3672 if (est.lookup == best.lookup &&
3673 est.space < best.space)
3676 case NFT_SET_POL_MEMORY:
3678 if (est.space < best.space)
3680 if (est.space == best.space &&
3681 est.lookup < best.lookup)
3683 } else if (est.size < best.size || !bops) {
3698 return ERR_PTR(-EOPNOTSUPP);
3701 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3702 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3703 .len = NFT_TABLE_MAXNAMELEN - 1 },
3704 [NFTA_SET_NAME] = { .type = NLA_STRING,
3705 .len = NFT_SET_MAXNAMELEN - 1 },
3706 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3707 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3708 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3709 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3710 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3711 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3712 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3713 [NFTA_SET_ID] = { .type = NLA_U32 },
3714 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3715 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3716 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3717 .len = NFT_USERDATA_MAXLEN },
3718 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3719 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3720 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3721 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3724 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3725 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3726 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3729 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3730 const struct nlattr *nla, u8 genmask)
3732 struct nft_set *set;
3735 return ERR_PTR(-EINVAL);
3737 list_for_each_entry_rcu(set, &table->sets, list) {
3738 if (!nla_strcmp(nla, set->name) &&
3739 nft_active_genmask(set, genmask))
3742 return ERR_PTR(-ENOENT);
3745 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3746 const struct nlattr *nla,
3749 struct nft_set *set;
3751 list_for_each_entry(set, &table->sets, list) {
3752 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3753 nft_active_genmask(set, genmask))
3756 return ERR_PTR(-ENOENT);
3759 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3760 const struct nft_table *table,
3761 const struct nlattr *nla, u8 genmask)
3763 struct nftables_pernet *nft_net = nft_pernet(net);
3764 u32 id = ntohl(nla_get_be32(nla));
3765 struct nft_trans *trans;
3767 list_for_each_entry(trans, &nft_net->commit_list, list) {
3768 if (trans->msg_type == NFT_MSG_NEWSET) {
3769 struct nft_set *set = nft_trans_set(trans);
3771 if (id == nft_trans_set_id(trans) &&
3772 set->table == table &&
3773 nft_active_genmask(set, genmask))
3777 return ERR_PTR(-ENOENT);
3780 struct nft_set *nft_set_lookup_global(const struct net *net,
3781 const struct nft_table *table,
3782 const struct nlattr *nla_set_name,
3783 const struct nlattr *nla_set_id,
3786 struct nft_set *set;
3788 set = nft_set_lookup(table, nla_set_name, genmask);
3793 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3797 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3799 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3802 const struct nft_set *i;
3804 unsigned long *inuse;
3805 unsigned int n = 0, min = 0;
3807 p = strchr(name, '%');
3809 if (p[1] != 'd' || strchr(p + 2, '%'))
3812 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3816 list_for_each_entry(i, &ctx->table->sets, list) {
3819 if (!nft_is_active_next(ctx->net, i))
3821 if (!sscanf(i->name, name, &tmp))
3823 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3826 set_bit(tmp - min, inuse);
3829 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3830 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3831 min += BITS_PER_BYTE * PAGE_SIZE;
3832 memset(inuse, 0, PAGE_SIZE);
3835 free_page((unsigned long)inuse);
3838 set->name = kasprintf(GFP_KERNEL, name, min + n);
3842 list_for_each_entry(i, &ctx->table->sets, list) {
3843 if (!nft_is_active_next(ctx->net, i))
3845 if (!strcmp(set->name, i->name)) {
3854 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3856 u64 ms = be64_to_cpu(nla_get_be64(nla));
3857 u64 max = (u64)(~((u64)0));
3859 max = div_u64(max, NSEC_PER_MSEC);
3863 ms *= NSEC_PER_MSEC;
3864 *result = nsecs_to_jiffies64(ms);
3868 __be64 nf_jiffies64_to_msecs(u64 input)
3870 return cpu_to_be64(jiffies64_to_msecs(input));
3873 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3874 const struct nft_set *set)
3876 struct nlattr *concat, *field;
3879 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3883 for (i = 0; i < set->field_count; i++) {
3884 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3888 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3889 htonl(set->field_len[i])))
3892 nla_nest_end(skb, field);
3895 nla_nest_end(skb, concat);
3900 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3901 const struct nft_set *set, u16 event, u16 flags)
3903 struct nlmsghdr *nlh;
3904 u32 portid = ctx->portid;
3905 struct nlattr *nest;
3909 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3910 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3911 NFNETLINK_V0, nft_base_seq(ctx->net));
3913 goto nla_put_failure;
3915 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3916 goto nla_put_failure;
3917 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3918 goto nla_put_failure;
3919 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
3921 goto nla_put_failure;
3922 if (set->flags != 0)
3923 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
3924 goto nla_put_failure;
3926 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
3927 goto nla_put_failure;
3928 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
3929 goto nla_put_failure;
3930 if (set->flags & NFT_SET_MAP) {
3931 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
3932 goto nla_put_failure;
3933 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
3934 goto nla_put_failure;
3936 if (set->flags & NFT_SET_OBJECT &&
3937 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
3938 goto nla_put_failure;
3941 nla_put_be64(skb, NFTA_SET_TIMEOUT,
3942 nf_jiffies64_to_msecs(set->timeout),
3944 goto nla_put_failure;
3946 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
3947 goto nla_put_failure;
3949 if (set->policy != NFT_SET_POL_PERFORMANCE) {
3950 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
3951 goto nla_put_failure;
3955 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
3956 goto nla_put_failure;
3958 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
3960 goto nla_put_failure;
3962 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
3963 goto nla_put_failure;
3965 if (set->field_count > 1 &&
3966 nf_tables_fill_set_concat(skb, set))
3967 goto nla_put_failure;
3969 nla_nest_end(skb, nest);
3971 if (set->num_exprs == 1) {
3972 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
3973 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
3974 goto nla_put_failure;
3976 nla_nest_end(skb, nest);
3977 } else if (set->num_exprs > 1) {
3978 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
3980 goto nla_put_failure;
3982 for (i = 0; i < set->num_exprs; i++) {
3983 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
3985 goto nla_put_failure;
3987 nla_nest_end(skb, nest);
3990 nlmsg_end(skb, nlh);
3994 nlmsg_trim(skb, nlh);
3998 static void nf_tables_set_notify(const struct nft_ctx *ctx,
3999 const struct nft_set *set, int event,
4002 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4003 u32 portid = ctx->portid;
4004 struct sk_buff *skb;
4009 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4012 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4016 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4017 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4019 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4025 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4028 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4031 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4033 const struct nft_set *set;
4034 unsigned int idx, s_idx = cb->args[0];
4035 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4036 struct net *net = sock_net(skb->sk);
4037 struct nft_ctx *ctx = cb->data, ctx_set;
4038 struct nftables_pernet *nft_net;
4044 nft_net = nft_pernet(net);
4045 cb->seq = READ_ONCE(nft_net->base_seq);
4047 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4048 if (ctx->family != NFPROTO_UNSPEC &&
4049 ctx->family != table->family)
4052 if (ctx->table && ctx->table != table)
4056 if (cur_table != table)
4062 list_for_each_entry_rcu(set, &table->sets, list) {
4065 if (!nft_is_active(net, set))
4069 ctx_set.table = table;
4070 ctx_set.family = table->family;
4072 if (nf_tables_fill_set(skb, &ctx_set, set,
4076 cb->args[2] = (unsigned long) table;
4079 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4092 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4094 struct nft_ctx *ctx_dump = NULL;
4096 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4097 if (ctx_dump == NULL)
4100 cb->data = ctx_dump;
4104 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4110 /* called with rcu_read_lock held */
4111 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4112 const struct nlattr * const nla[])
4114 struct netlink_ext_ack *extack = info->extack;
4115 u8 genmask = nft_genmask_cur(info->net);
4116 u8 family = info->nfmsg->nfgen_family;
4117 struct nft_table *table = NULL;
4118 struct net *net = info->net;
4119 const struct nft_set *set;
4120 struct sk_buff *skb2;
4124 if (nla[NFTA_SET_TABLE]) {
4125 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4127 if (IS_ERR(table)) {
4128 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4129 return PTR_ERR(table);
4133 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4135 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4136 struct netlink_dump_control c = {
4137 .start = nf_tables_dump_sets_start,
4138 .dump = nf_tables_dump_sets,
4139 .done = nf_tables_dump_sets_done,
4141 .module = THIS_MODULE,
4144 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4147 /* Only accept unspec with dump */
4148 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4149 return -EAFNOSUPPORT;
4150 if (!nla[NFTA_SET_TABLE])
4153 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4155 return PTR_ERR(set);
4157 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4161 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4163 goto err_fill_set_info;
4165 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4172 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4173 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4176 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4177 struct nft_set_desc *desc)
4179 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4183 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4186 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4187 nft_concat_policy, NULL);
4191 if (!tb[NFTA_SET_FIELD_LEN])
4194 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4195 if (!len || len > U8_MAX)
4198 desc->field_len[desc->field_count++] = len;
4203 static int nft_set_desc_concat(struct nft_set_desc *desc,
4204 const struct nlattr *nla)
4206 struct nlattr *attr;
4210 nla_for_each_nested(attr, nla, rem) {
4211 if (nla_type(attr) != NFTA_LIST_ELEM)
4214 err = nft_set_desc_concat_parse(attr, desc);
4219 for (i = 0; i < desc->field_count; i++)
4220 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4222 if (num_regs > NFT_REG32_COUNT)
4228 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4229 const struct nlattr *nla)
4231 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4234 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4235 nft_set_desc_policy, NULL);
4239 if (da[NFTA_SET_DESC_SIZE] != NULL)
4240 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4241 if (da[NFTA_SET_DESC_CONCAT])
4242 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4247 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4248 const struct nlattr * const nla[])
4250 u32 ktype, dtype, flags, policy, gc_int, objtype;
4251 struct netlink_ext_ack *extack = info->extack;
4252 u8 genmask = nft_genmask_next(info->net);
4253 u8 family = info->nfmsg->nfgen_family;
4254 const struct nft_set_ops *ops;
4255 struct nft_expr *expr = NULL;
4256 struct net *net = info->net;
4257 struct nft_set_desc desc;
4258 struct nft_table *table;
4259 unsigned char *udata;
4260 struct nft_set *set;
4269 if (nla[NFTA_SET_TABLE] == NULL ||
4270 nla[NFTA_SET_NAME] == NULL ||
4271 nla[NFTA_SET_KEY_LEN] == NULL ||
4272 nla[NFTA_SET_ID] == NULL)
4275 memset(&desc, 0, sizeof(desc));
4277 ktype = NFT_DATA_VALUE;
4278 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4279 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4280 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4284 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4285 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4289 if (nla[NFTA_SET_FLAGS] != NULL) {
4290 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4291 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4292 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4293 NFT_SET_MAP | NFT_SET_EVAL |
4294 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4296 /* Only one of these operations is supported */
4297 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4298 (NFT_SET_MAP | NFT_SET_OBJECT))
4300 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4301 (NFT_SET_EVAL | NFT_SET_OBJECT))
4306 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4307 if (!(flags & NFT_SET_MAP))
4310 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4311 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4312 dtype != NFT_DATA_VERDICT)
4315 if (dtype != NFT_DATA_VERDICT) {
4316 if (nla[NFTA_SET_DATA_LEN] == NULL)
4318 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4319 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4322 desc.dlen = sizeof(struct nft_verdict);
4323 } else if (flags & NFT_SET_MAP)
4326 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4327 if (!(flags & NFT_SET_OBJECT))
4330 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4331 if (objtype == NFT_OBJECT_UNSPEC ||
4332 objtype > NFT_OBJECT_MAX)
4334 } else if (flags & NFT_SET_OBJECT)
4337 objtype = NFT_OBJECT_UNSPEC;
4340 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4341 if (!(flags & NFT_SET_TIMEOUT))
4344 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4349 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4350 if (!(flags & NFT_SET_TIMEOUT))
4352 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4355 policy = NFT_SET_POL_PERFORMANCE;
4356 if (nla[NFTA_SET_POLICY] != NULL)
4357 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4359 if (nla[NFTA_SET_DESC] != NULL) {
4360 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4364 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4366 } else if (flags & NFT_SET_CONCAT) {
4370 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4373 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4374 NETLINK_CB(skb).portid);
4375 if (IS_ERR(table)) {
4376 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4377 return PTR_ERR(table);
4380 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4382 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4384 if (PTR_ERR(set) != -ENOENT) {
4385 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4386 return PTR_ERR(set);
4389 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4390 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4393 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4399 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4402 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4404 return PTR_ERR(ops);
4407 if (nla[NFTA_SET_USERDATA])
4408 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4411 if (ops->privsize != NULL)
4412 size = ops->privsize(nla, &desc);
4413 alloc_size = sizeof(*set) + size + udlen;
4414 if (alloc_size < size || alloc_size > INT_MAX)
4416 set = kvzalloc(alloc_size, GFP_KERNEL);
4420 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL);
4426 err = nf_tables_set_alloc_name(&ctx, set, name);
4433 udata = set->data + size;
4434 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4437 INIT_LIST_HEAD(&set->bindings);
4438 INIT_LIST_HEAD(&set->catchall_list);
4440 write_pnet(&set->net, net);
4443 set->klen = desc.klen;
4445 set->objtype = objtype;
4446 set->dlen = desc.dlen;
4448 set->size = desc.size;
4449 set->policy = policy;
4452 set->timeout = timeout;
4453 set->gc_int = gc_int;
4455 set->field_count = desc.field_count;
4456 for (i = 0; i < desc.field_count; i++)
4457 set->field_len[i] = desc.field_len[i];
4459 err = ops->init(set, &desc, nla);
4463 if (nla[NFTA_SET_EXPR]) {
4464 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4466 err = PTR_ERR(expr);
4467 goto err_set_expr_alloc;
4469 set->exprs[0] = expr;
4471 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4472 struct nft_expr *expr;
4476 if (!(flags & NFT_SET_EXPR)) {
4478 goto err_set_expr_alloc;
4481 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4482 if (i == NFT_SET_EXPR_MAX) {
4484 goto err_set_expr_alloc;
4486 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4488 goto err_set_expr_alloc;
4490 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4492 err = PTR_ERR(expr);
4493 goto err_set_expr_alloc;
4495 set->exprs[i++] = expr;
4500 set->handle = nf_tables_alloc_handle(table);
4502 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4504 goto err_set_expr_alloc;
4506 list_add_tail_rcu(&set->list, &table->sets);
4511 for (i = 0; i < set->num_exprs; i++)
4512 nft_expr_destroy(&ctx, set->exprs[i]);
4522 struct nft_set_elem_catchall {
4523 struct list_head list;
4524 struct rcu_head rcu;
4528 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4529 struct nft_set *set)
4531 struct nft_set_elem_catchall *next, *catchall;
4533 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4534 list_del_rcu(&catchall->list);
4535 nft_set_elem_destroy(set, catchall->elem, true);
4536 kfree_rcu(catchall, rcu);
4540 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4544 if (WARN_ON(set->use > 0))
4547 for (i = 0; i < set->num_exprs; i++)
4548 nft_expr_destroy(ctx, set->exprs[i]);
4550 set->ops->destroy(set);
4551 nft_set_catchall_destroy(ctx, set);
4556 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4557 const struct nlattr * const nla[])
4559 struct netlink_ext_ack *extack = info->extack;
4560 u8 genmask = nft_genmask_next(info->net);
4561 u8 family = info->nfmsg->nfgen_family;
4562 struct net *net = info->net;
4563 const struct nlattr *attr;
4564 struct nft_table *table;
4565 struct nft_set *set;
4568 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4569 return -EAFNOSUPPORT;
4571 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4572 genmask, NETLINK_CB(skb).portid);
4573 if (IS_ERR(table)) {
4574 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4575 return PTR_ERR(table);
4578 if (nla[NFTA_SET_HANDLE]) {
4579 attr = nla[NFTA_SET_HANDLE];
4580 set = nft_set_lookup_byhandle(table, attr, genmask);
4582 attr = nla[NFTA_SET_NAME];
4583 set = nft_set_lookup(table, attr, genmask);
4587 NL_SET_BAD_ATTR(extack, attr);
4588 return PTR_ERR(set);
4591 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4592 atomic_read(&set->nelems) > 0)) {
4593 NL_SET_BAD_ATTR(extack, attr);
4597 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4599 return nft_delset(&ctx, set);
4602 static int nft_validate_register_store(const struct nft_ctx *ctx,
4603 enum nft_registers reg,
4604 const struct nft_data *data,
4605 enum nft_data_types type,
4608 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4609 struct nft_set *set,
4610 struct nft_set_elem *elem)
4612 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4613 enum nft_registers dreg;
4615 dreg = nft_type_to_reg(set->dtype);
4616 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4617 set->dtype == NFT_DATA_VERDICT ?
4618 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4622 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4623 struct nft_set *set,
4624 const struct nft_set_iter *iter,
4625 struct nft_set_elem *elem)
4627 return nft_setelem_data_validate(ctx, set, elem);
4630 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4631 struct nft_set *set)
4633 u8 genmask = nft_genmask_next(ctx->net);
4634 struct nft_set_elem_catchall *catchall;
4635 struct nft_set_elem elem;
4636 struct nft_set_ext *ext;
4639 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4640 ext = nft_set_elem_ext(set, catchall->elem);
4641 if (!nft_set_elem_active(ext, genmask))
4644 elem.priv = catchall->elem;
4645 ret = nft_setelem_data_validate(ctx, set, &elem);
4653 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4654 struct nft_set_binding *binding)
4656 struct nft_set_binding *i;
4657 struct nft_set_iter iter;
4659 if (set->use == UINT_MAX)
4662 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4665 if (binding->flags & NFT_SET_MAP) {
4666 /* If the set is already bound to the same chain all
4667 * jumps are already validated for that chain.
4669 list_for_each_entry(i, &set->bindings, list) {
4670 if (i->flags & NFT_SET_MAP &&
4671 i->chain == binding->chain)
4675 iter.genmask = nft_genmask_next(ctx->net);
4679 iter.fn = nf_tables_bind_check_setelem;
4681 set->ops->walk(ctx, set, &iter);
4683 iter.err = nft_set_catchall_bind_check(ctx, set);
4689 binding->chain = ctx->chain;
4690 list_add_tail_rcu(&binding->list, &set->bindings);
4691 nft_set_trans_bind(ctx, set);
4696 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4698 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4699 struct nft_set_binding *binding, bool event)
4701 list_del_rcu(&binding->list);
4703 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4704 list_del_rcu(&set->list);
4706 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4711 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4712 struct nft_set_binding *binding,
4713 enum nft_trans_phase phase)
4716 case NFT_TRANS_PREPARE:
4719 case NFT_TRANS_ABORT:
4720 case NFT_TRANS_RELEASE:
4724 nf_tables_unbind_set(ctx, set, binding,
4725 phase == NFT_TRANS_COMMIT);
4728 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4730 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4732 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4733 nft_set_destroy(ctx, set);
4735 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4737 const struct nft_set_ext_type nft_set_ext_types[] = {
4738 [NFT_SET_EXT_KEY] = {
4739 .align = __alignof__(u32),
4741 [NFT_SET_EXT_DATA] = {
4742 .align = __alignof__(u32),
4744 [NFT_SET_EXT_EXPRESSIONS] = {
4745 .align = __alignof__(struct nft_set_elem_expr),
4747 [NFT_SET_EXT_OBJREF] = {
4748 .len = sizeof(struct nft_object *),
4749 .align = __alignof__(struct nft_object *),
4751 [NFT_SET_EXT_FLAGS] = {
4753 .align = __alignof__(u8),
4755 [NFT_SET_EXT_TIMEOUT] = {
4757 .align = __alignof__(u64),
4759 [NFT_SET_EXT_EXPIRATION] = {
4761 .align = __alignof__(u64),
4763 [NFT_SET_EXT_USERDATA] = {
4764 .len = sizeof(struct nft_userdata),
4765 .align = __alignof__(struct nft_userdata),
4767 [NFT_SET_EXT_KEY_END] = {
4768 .align = __alignof__(u32),
4776 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4777 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4778 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4779 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4780 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4781 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4782 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4783 .len = NFT_USERDATA_MAXLEN },
4784 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4785 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4786 .len = NFT_OBJ_MAXNAMELEN - 1 },
4787 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4788 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4791 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4792 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4793 .len = NFT_TABLE_MAXNAMELEN - 1 },
4794 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4795 .len = NFT_SET_MAXNAMELEN - 1 },
4796 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4797 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4800 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4801 const struct nft_set *set,
4802 const struct nft_set_ext *ext)
4804 struct nft_set_elem_expr *elem_expr;
4805 u32 size, num_exprs = 0;
4806 struct nft_expr *expr;
4807 struct nlattr *nest;
4809 elem_expr = nft_set_ext_expr(ext);
4810 nft_setelem_expr_foreach(expr, elem_expr, size)
4813 if (num_exprs == 1) {
4814 expr = nft_setelem_expr_at(elem_expr, 0);
4815 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4819 } else if (num_exprs > 1) {
4820 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4822 goto nla_put_failure;
4824 nft_setelem_expr_foreach(expr, elem_expr, size) {
4825 expr = nft_setelem_expr_at(elem_expr, size);
4826 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4827 goto nla_put_failure;
4829 nla_nest_end(skb, nest);
4837 static int nf_tables_fill_setelem(struct sk_buff *skb,
4838 const struct nft_set *set,
4839 const struct nft_set_elem *elem)
4841 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4842 unsigned char *b = skb_tail_pointer(skb);
4843 struct nlattr *nest;
4845 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4847 goto nla_put_failure;
4849 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4850 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4851 NFT_DATA_VALUE, set->klen) < 0)
4852 goto nla_put_failure;
4854 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4855 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4856 NFT_DATA_VALUE, set->klen) < 0)
4857 goto nla_put_failure;
4859 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4860 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4861 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4863 goto nla_put_failure;
4865 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4866 nft_set_elem_expr_dump(skb, set, ext))
4867 goto nla_put_failure;
4869 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4870 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4871 (*nft_set_ext_obj(ext))->key.name) < 0)
4872 goto nla_put_failure;
4874 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4875 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4876 htonl(*nft_set_ext_flags(ext))))
4877 goto nla_put_failure;
4879 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4880 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4881 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4883 goto nla_put_failure;
4885 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4886 u64 expires, now = get_jiffies_64();
4888 expires = *nft_set_ext_expiration(ext);
4889 if (time_before64(now, expires))
4894 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4895 nf_jiffies64_to_msecs(expires),
4897 goto nla_put_failure;
4900 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4901 struct nft_userdata *udata;
4903 udata = nft_set_ext_userdata(ext);
4904 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4905 udata->len + 1, udata->data))
4906 goto nla_put_failure;
4909 nla_nest_end(skb, nest);
4917 struct nft_set_dump_args {
4918 const struct netlink_callback *cb;
4919 struct nft_set_iter iter;
4920 struct sk_buff *skb;
4923 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
4924 struct nft_set *set,
4925 const struct nft_set_iter *iter,
4926 struct nft_set_elem *elem)
4928 struct nft_set_dump_args *args;
4930 args = container_of(iter, struct nft_set_dump_args, iter);
4931 return nf_tables_fill_setelem(args->skb, set, elem);
4934 struct nft_set_dump_ctx {
4935 const struct nft_set *set;
4939 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
4940 const struct nft_set *set)
4942 struct nft_set_elem_catchall *catchall;
4943 u8 genmask = nft_genmask_cur(net);
4944 struct nft_set_elem elem;
4945 struct nft_set_ext *ext;
4948 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4949 ext = nft_set_elem_ext(set, catchall->elem);
4950 if (!nft_set_elem_active(ext, genmask) ||
4951 nft_set_elem_expired(ext))
4954 elem.priv = catchall->elem;
4955 ret = nf_tables_fill_setelem(skb, set, &elem);
4962 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
4964 struct nft_set_dump_ctx *dump_ctx = cb->data;
4965 struct net *net = sock_net(skb->sk);
4966 struct nftables_pernet *nft_net;
4967 struct nft_table *table;
4968 struct nft_set *set;
4969 struct nft_set_dump_args args;
4970 bool set_found = false;
4971 struct nlmsghdr *nlh;
4972 struct nlattr *nest;
4977 nft_net = nft_pernet(net);
4978 cb->seq = READ_ONCE(nft_net->base_seq);
4980 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4981 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
4982 dump_ctx->ctx.family != table->family)
4985 if (table != dump_ctx->ctx.table)
4988 list_for_each_entry_rcu(set, &table->sets, list) {
4989 if (set == dump_ctx->set) {
5002 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5003 portid = NETLINK_CB(cb->skb).portid;
5004 seq = cb->nlh->nlmsg_seq;
5006 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5007 table->family, NFNETLINK_V0, nft_base_seq(net));
5009 goto nla_put_failure;
5011 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5012 goto nla_put_failure;
5013 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5014 goto nla_put_failure;
5016 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5018 goto nla_put_failure;
5022 args.iter.genmask = nft_genmask_cur(net);
5023 args.iter.skip = cb->args[0];
5024 args.iter.count = 0;
5026 args.iter.fn = nf_tables_dump_setelem;
5027 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5029 if (!args.iter.err && args.iter.count == cb->args[0])
5030 args.iter.err = nft_set_catchall_dump(net, skb, set);
5033 nla_nest_end(skb, nest);
5034 nlmsg_end(skb, nlh);
5036 if (args.iter.err && args.iter.err != -EMSGSIZE)
5037 return args.iter.err;
5038 if (args.iter.count == cb->args[0])
5041 cb->args[0] = args.iter.count;
5049 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5051 struct nft_set_dump_ctx *dump_ctx = cb->data;
5053 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5055 return cb->data ? 0 : -ENOMEM;
5058 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5064 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5065 const struct nft_ctx *ctx, u32 seq,
5066 u32 portid, int event, u16 flags,
5067 const struct nft_set *set,
5068 const struct nft_set_elem *elem)
5070 struct nlmsghdr *nlh;
5071 struct nlattr *nest;
5074 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5075 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5076 NFNETLINK_V0, nft_base_seq(ctx->net));
5078 goto nla_put_failure;
5080 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5081 goto nla_put_failure;
5082 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5083 goto nla_put_failure;
5085 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5087 goto nla_put_failure;
5089 err = nf_tables_fill_setelem(skb, set, elem);
5091 goto nla_put_failure;
5093 nla_nest_end(skb, nest);
5095 nlmsg_end(skb, nlh);
5099 nlmsg_trim(skb, nlh);
5103 static int nft_setelem_parse_flags(const struct nft_set *set,
5104 const struct nlattr *attr, u32 *flags)
5109 *flags = ntohl(nla_get_be32(attr));
5110 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5112 if (!(set->flags & NFT_SET_INTERVAL) &&
5113 *flags & NFT_SET_ELEM_INTERVAL_END)
5115 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5116 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5122 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5123 struct nft_data *key, struct nlattr *attr)
5125 struct nft_data_desc desc = {
5126 .type = NFT_DATA_VALUE,
5127 .size = NFT_DATA_VALUE_MAXLEN,
5131 return nft_data_init(ctx, key, &desc, attr);
5134 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5135 struct nft_data_desc *desc,
5136 struct nft_data *data,
5137 struct nlattr *attr)
5141 if (set->dtype == NFT_DATA_VERDICT)
5142 dtype = NFT_DATA_VERDICT;
5144 dtype = NFT_DATA_VALUE;
5147 desc->size = NFT_DATA_VALUE_MAXLEN;
5148 desc->len = set->dlen;
5149 desc->flags = NFT_DATA_DESC_SETELEM;
5151 return nft_data_init(ctx, data, desc, attr);
5154 static void *nft_setelem_catchall_get(const struct net *net,
5155 const struct nft_set *set)
5157 struct nft_set_elem_catchall *catchall;
5158 u8 genmask = nft_genmask_cur(net);
5159 struct nft_set_ext *ext;
5162 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5163 ext = nft_set_elem_ext(set, catchall->elem);
5164 if (!nft_set_elem_active(ext, genmask) ||
5165 nft_set_elem_expired(ext))
5168 priv = catchall->elem;
5175 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5176 struct nft_set_elem *elem, u32 flags)
5180 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5181 priv = set->ops->get(ctx->net, set, elem, flags);
5183 return PTR_ERR(priv);
5185 priv = nft_setelem_catchall_get(ctx->net, set);
5194 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5195 const struct nlattr *attr)
5197 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5198 struct nft_set_elem elem;
5199 struct sk_buff *skb;
5203 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5204 nft_set_elem_policy, NULL);
5208 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5212 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5215 if (nla[NFTA_SET_ELEM_KEY]) {
5216 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5217 nla[NFTA_SET_ELEM_KEY]);
5222 if (nla[NFTA_SET_ELEM_KEY_END]) {
5223 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5224 nla[NFTA_SET_ELEM_KEY_END]);
5229 err = nft_setelem_get(ctx, set, &elem, flags);
5234 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5238 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5239 NFT_MSG_NEWSETELEM, 0, set, &elem);
5241 goto err_fill_setelem;
5243 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5250 /* called with rcu_read_lock held */
5251 static int nf_tables_getsetelem(struct sk_buff *skb,
5252 const struct nfnl_info *info,
5253 const struct nlattr * const nla[])
5255 struct netlink_ext_ack *extack = info->extack;
5256 u8 genmask = nft_genmask_cur(info->net);
5257 u8 family = info->nfmsg->nfgen_family;
5258 struct net *net = info->net;
5259 struct nft_table *table;
5260 struct nft_set *set;
5261 struct nlattr *attr;
5265 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5266 genmask, NETLINK_CB(skb).portid);
5267 if (IS_ERR(table)) {
5268 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5269 return PTR_ERR(table);
5272 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5274 return PTR_ERR(set);
5276 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5278 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5279 struct netlink_dump_control c = {
5280 .start = nf_tables_dump_set_start,
5281 .dump = nf_tables_dump_set,
5282 .done = nf_tables_dump_set_done,
5283 .module = THIS_MODULE,
5285 struct nft_set_dump_ctx dump_ctx = {
5291 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5294 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5297 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5298 err = nft_get_set_elem(&ctx, set, attr);
5306 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5307 const struct nft_set *set,
5308 const struct nft_set_elem *elem,
5311 struct nftables_pernet *nft_net;
5312 struct net *net = ctx->net;
5313 u32 portid = ctx->portid;
5314 struct sk_buff *skb;
5318 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5321 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5325 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5326 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5328 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5335 nft_net = nft_pernet(net);
5336 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5339 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5342 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5344 struct nft_set *set)
5346 struct nft_trans *trans;
5348 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5352 nft_trans_elem_set(trans) = set;
5356 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5357 const struct nft_set *set,
5358 const struct nlattr *attr)
5360 struct nft_expr *expr;
5363 expr = nft_expr_init(ctx, attr);
5368 if (expr->ops->type->flags & NFT_EXPR_GC) {
5369 if (set->flags & NFT_SET_TIMEOUT)
5370 goto err_set_elem_expr;
5371 if (!set->ops->gc_init)
5372 goto err_set_elem_expr;
5373 set->ops->gc_init(set);
5379 nft_expr_destroy(ctx, expr);
5380 return ERR_PTR(err);
5383 void *nft_set_elem_init(const struct nft_set *set,
5384 const struct nft_set_ext_tmpl *tmpl,
5385 const u32 *key, const u32 *key_end,
5386 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5388 struct nft_set_ext *ext;
5391 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5395 ext = nft_set_elem_ext(set, elem);
5396 nft_set_ext_init(ext, tmpl);
5398 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5399 memcpy(nft_set_ext_key(ext), key, set->klen);
5400 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5401 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5402 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5403 memcpy(nft_set_ext_data(ext), data, set->dlen);
5404 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5405 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5406 if (expiration == 0)
5407 *nft_set_ext_expiration(ext) += timeout;
5409 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5410 *nft_set_ext_timeout(ext) = timeout;
5415 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5416 struct nft_expr *expr)
5418 if (expr->ops->destroy_clone) {
5419 expr->ops->destroy_clone(ctx, expr);
5420 module_put(expr->ops->type->owner);
5422 nf_tables_expr_destroy(ctx, expr);
5426 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5427 struct nft_set_elem_expr *elem_expr)
5429 struct nft_expr *expr;
5432 nft_setelem_expr_foreach(expr, elem_expr, size)
5433 __nft_set_elem_expr_destroy(ctx, expr);
5436 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5439 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5440 struct nft_ctx ctx = {
5441 .net = read_pnet(&set->net),
5442 .family = set->table->family,
5445 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5446 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5447 nft_data_release(nft_set_ext_data(ext), set->dtype);
5448 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5449 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5451 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5452 (*nft_set_ext_obj(ext))->use--;
5455 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5457 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5458 * with the refcounting from the preparation phase.
5460 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5461 const struct nft_set *set, void *elem)
5463 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5465 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5466 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5471 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5472 struct nft_expr *expr_array[])
5474 struct nft_expr *expr;
5477 for (i = 0; i < set->num_exprs; i++) {
5478 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL);
5482 err = nft_expr_clone(expr, set->exprs[i]);
5487 expr_array[i] = expr;
5493 for (k = i - 1; k >= 0; k--)
5494 nft_expr_destroy(ctx, expr_array[k]);
5499 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5500 const struct nft_set_ext *ext,
5501 struct nft_expr *expr_array[],
5504 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5505 struct nft_expr *expr;
5508 for (i = 0; i < num_exprs; i++) {
5509 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5510 err = nft_expr_clone(expr, expr_array[i]);
5512 goto err_elem_expr_setup;
5514 elem_expr->size += expr_array[i]->ops->size;
5515 nft_expr_destroy(ctx, expr_array[i]);
5516 expr_array[i] = NULL;
5521 err_elem_expr_setup:
5522 for (; i < num_exprs; i++) {
5523 nft_expr_destroy(ctx, expr_array[i]);
5524 expr_array[i] = NULL;
5530 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5531 const struct nft_set *set)
5533 struct nft_set_elem_catchall *catchall;
5534 u8 genmask = nft_genmask_cur(net);
5535 struct nft_set_ext *ext;
5537 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5538 ext = nft_set_elem_ext(set, catchall->elem);
5539 if (nft_set_elem_active(ext, genmask) &&
5540 !nft_set_elem_expired(ext))
5546 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5548 void *nft_set_catchall_gc(const struct nft_set *set)
5550 struct nft_set_elem_catchall *catchall, *next;
5551 struct nft_set_ext *ext;
5554 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5555 ext = nft_set_elem_ext(set, catchall->elem);
5557 if (!nft_set_elem_expired(ext) ||
5558 nft_set_elem_mark_busy(ext))
5561 elem = catchall->elem;
5562 list_del_rcu(&catchall->list);
5563 kfree_rcu(catchall, rcu);
5569 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5571 static int nft_setelem_catchall_insert(const struct net *net,
5572 struct nft_set *set,
5573 const struct nft_set_elem *elem,
5574 struct nft_set_ext **pext)
5576 struct nft_set_elem_catchall *catchall;
5577 u8 genmask = nft_genmask_next(net);
5578 struct nft_set_ext *ext;
5580 list_for_each_entry(catchall, &set->catchall_list, list) {
5581 ext = nft_set_elem_ext(set, catchall->elem);
5582 if (nft_set_elem_active(ext, genmask)) {
5588 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5592 catchall->elem = elem->priv;
5593 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5598 static int nft_setelem_insert(const struct net *net,
5599 struct nft_set *set,
5600 const struct nft_set_elem *elem,
5601 struct nft_set_ext **ext, unsigned int flags)
5605 if (flags & NFT_SET_ELEM_CATCHALL)
5606 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5608 ret = set->ops->insert(net, set, elem, ext);
5613 static bool nft_setelem_is_catchall(const struct nft_set *set,
5614 const struct nft_set_elem *elem)
5616 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5618 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5619 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5625 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5626 struct nft_set_elem *elem)
5628 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5630 if (nft_setelem_is_catchall(set, elem)) {
5631 nft_set_elem_change_active(net, set, ext);
5632 nft_set_elem_clear_busy(ext);
5634 set->ops->activate(net, set, elem);
5638 static int nft_setelem_catchall_deactivate(const struct net *net,
5639 struct nft_set *set,
5640 struct nft_set_elem *elem)
5642 struct nft_set_elem_catchall *catchall;
5643 struct nft_set_ext *ext;
5645 list_for_each_entry(catchall, &set->catchall_list, list) {
5646 ext = nft_set_elem_ext(set, catchall->elem);
5647 if (!nft_is_active(net, ext) ||
5648 nft_set_elem_mark_busy(ext))
5652 elem->priv = catchall->elem;
5653 nft_set_elem_change_active(net, set, ext);
5660 static int __nft_setelem_deactivate(const struct net *net,
5661 struct nft_set *set,
5662 struct nft_set_elem *elem)
5666 priv = set->ops->deactivate(net, set, elem);
5677 static int nft_setelem_deactivate(const struct net *net,
5678 struct nft_set *set,
5679 struct nft_set_elem *elem, u32 flags)
5683 if (flags & NFT_SET_ELEM_CATCHALL)
5684 ret = nft_setelem_catchall_deactivate(net, set, elem);
5686 ret = __nft_setelem_deactivate(net, set, elem);
5691 static void nft_setelem_catchall_remove(const struct net *net,
5692 const struct nft_set *set,
5693 const struct nft_set_elem *elem)
5695 struct nft_set_elem_catchall *catchall, *next;
5697 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5698 if (catchall->elem == elem->priv) {
5699 list_del_rcu(&catchall->list);
5700 kfree_rcu(catchall, rcu);
5706 static void nft_setelem_remove(const struct net *net,
5707 const struct nft_set *set,
5708 const struct nft_set_elem *elem)
5710 if (nft_setelem_is_catchall(set, elem))
5711 nft_setelem_catchall_remove(net, set, elem);
5713 set->ops->remove(net, set, elem);
5716 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5717 struct nlattr **nla, u32 flags)
5719 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5720 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5721 if (flags & NFT_SET_ELEM_INTERVAL_END)
5723 if (!nla[NFTA_SET_ELEM_KEY_END] &&
5724 !(flags & NFT_SET_ELEM_CATCHALL))
5727 if (nla[NFTA_SET_ELEM_KEY_END])
5734 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5735 const struct nlattr *attr, u32 nlmsg_flags)
5737 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5738 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5739 u8 genmask = nft_genmask_next(ctx->net);
5740 u32 flags = 0, size = 0, num_exprs = 0;
5741 struct nft_set_ext_tmpl tmpl;
5742 struct nft_set_ext *ext, *ext2;
5743 struct nft_set_elem elem;
5744 struct nft_set_binding *binding;
5745 struct nft_object *obj = NULL;
5746 struct nft_userdata *udata;
5747 struct nft_data_desc desc;
5748 enum nft_registers dreg;
5749 struct nft_trans *trans;
5755 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5756 nft_set_elem_policy, NULL);
5760 nft_set_ext_prepare(&tmpl);
5762 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5766 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5770 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5775 if (set->flags & NFT_SET_MAP) {
5776 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5777 !(flags & NFT_SET_ELEM_INTERVAL_END))
5780 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5784 if (set->flags & NFT_SET_OBJECT) {
5785 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5786 !(flags & NFT_SET_ELEM_INTERVAL_END))
5789 if (nla[NFTA_SET_ELEM_OBJREF])
5793 if (!nft_setelem_valid_key_end(set, nla, flags))
5796 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5797 (nla[NFTA_SET_ELEM_DATA] ||
5798 nla[NFTA_SET_ELEM_OBJREF] ||
5799 nla[NFTA_SET_ELEM_TIMEOUT] ||
5800 nla[NFTA_SET_ELEM_EXPIRATION] ||
5801 nla[NFTA_SET_ELEM_USERDATA] ||
5802 nla[NFTA_SET_ELEM_EXPR] ||
5803 nla[NFTA_SET_ELEM_KEY_END] ||
5804 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5808 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5809 if (!(set->flags & NFT_SET_TIMEOUT))
5811 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5815 } else if (set->flags & NFT_SET_TIMEOUT) {
5816 timeout = set->timeout;
5820 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5821 if (!(set->flags & NFT_SET_TIMEOUT))
5823 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5829 if (nla[NFTA_SET_ELEM_EXPR]) {
5830 struct nft_expr *expr;
5832 if (set->num_exprs && set->num_exprs != 1)
5835 expr = nft_set_elem_expr_alloc(ctx, set,
5836 nla[NFTA_SET_ELEM_EXPR]);
5838 return PTR_ERR(expr);
5840 expr_array[0] = expr;
5843 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5845 goto err_set_elem_expr;
5847 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5848 struct nft_expr *expr;
5853 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5854 if (i == NFT_SET_EXPR_MAX ||
5855 (set->num_exprs && set->num_exprs == i)) {
5857 goto err_set_elem_expr;
5859 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5861 goto err_set_elem_expr;
5863 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5865 err = PTR_ERR(expr);
5866 goto err_set_elem_expr;
5868 expr_array[i] = expr;
5871 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5873 goto err_set_elem_expr;
5877 if (set->num_exprs && set->num_exprs != i) {
5879 goto err_set_elem_expr;
5881 } else if (set->num_exprs > 0) {
5882 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5884 goto err_set_elem_expr_clone;
5886 num_exprs = set->num_exprs;
5889 if (nla[NFTA_SET_ELEM_KEY]) {
5890 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5891 nla[NFTA_SET_ELEM_KEY]);
5893 goto err_set_elem_expr;
5895 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5900 if (nla[NFTA_SET_ELEM_KEY_END]) {
5901 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5902 nla[NFTA_SET_ELEM_KEY_END]);
5906 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5908 goto err_parse_key_end;
5912 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5914 goto err_parse_key_end;
5916 if (timeout != set->timeout) {
5917 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5919 goto err_parse_key_end;
5924 for (i = 0; i < num_exprs; i++)
5925 size += expr_array[i]->ops->size;
5927 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5928 sizeof(struct nft_set_elem_expr) + size);
5930 goto err_parse_key_end;
5933 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5934 obj = nft_obj_lookup(ctx->net, ctx->table,
5935 nla[NFTA_SET_ELEM_OBJREF],
5936 set->objtype, genmask);
5939 goto err_parse_key_end;
5941 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5943 goto err_parse_key_end;
5946 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5947 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5948 nla[NFTA_SET_ELEM_DATA]);
5950 goto err_parse_key_end;
5952 dreg = nft_type_to_reg(set->dtype);
5953 list_for_each_entry(binding, &set->bindings, list) {
5954 struct nft_ctx bind_ctx = {
5956 .family = ctx->family,
5957 .table = ctx->table,
5958 .chain = (struct nft_chain *)binding->chain,
5961 if (!(binding->flags & NFT_SET_MAP))
5964 err = nft_validate_register_store(&bind_ctx, dreg,
5966 desc.type, desc.len);
5968 goto err_parse_data;
5970 if (desc.type == NFT_DATA_VERDICT &&
5971 (elem.data.val.verdict.code == NFT_GOTO ||
5972 elem.data.val.verdict.code == NFT_JUMP))
5973 nft_validate_state_update(ctx->net,
5977 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
5979 goto err_parse_data;
5982 /* The full maximum length of userdata can exceed the maximum
5983 * offset value (U8_MAX) for following extensions, therefor it
5984 * must be the last extension added.
5987 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
5988 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
5990 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
5993 goto err_parse_data;
5998 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
5999 elem.key_end.val.data, elem.data.val.data,
6000 timeout, expiration, GFP_KERNEL);
6001 if (elem.priv == NULL)
6002 goto err_parse_data;
6004 ext = nft_set_elem_ext(set, elem.priv);
6006 *nft_set_ext_flags(ext) = flags;
6008 udata = nft_set_ext_userdata(ext);
6009 udata->len = ulen - 1;
6010 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6013 *nft_set_ext_obj(ext) = obj;
6016 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6020 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6021 if (trans == NULL) {
6026 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6028 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6030 if (err == -EEXIST) {
6031 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6032 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6033 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6034 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6035 goto err_element_clash;
6036 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6037 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6038 memcmp(nft_set_ext_data(ext),
6039 nft_set_ext_data(ext2), set->dlen) != 0) ||
6040 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6041 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6042 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6043 goto err_element_clash;
6044 else if (!(nlmsg_flags & NLM_F_EXCL))
6046 } else if (err == -ENOTEMPTY) {
6047 /* ENOTEMPTY reports overlapping between this element
6048 * and an existing one.
6052 goto err_element_clash;
6055 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6056 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6061 nft_trans_elem(trans) = elem;
6062 nft_trans_commit_list_add_tail(ctx->net, trans);
6066 nft_setelem_remove(ctx->net, set, &elem);
6073 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6075 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6076 nft_data_release(&elem.data.val, desc.type);
6078 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6080 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6082 for (i = 0; i < num_exprs && expr_array[i]; i++)
6083 nft_expr_destroy(ctx, expr_array[i]);
6084 err_set_elem_expr_clone:
6088 static int nf_tables_newsetelem(struct sk_buff *skb,
6089 const struct nfnl_info *info,
6090 const struct nlattr * const nla[])
6092 struct nftables_pernet *nft_net = nft_pernet(info->net);
6093 struct netlink_ext_ack *extack = info->extack;
6094 u8 genmask = nft_genmask_next(info->net);
6095 u8 family = info->nfmsg->nfgen_family;
6096 struct net *net = info->net;
6097 const struct nlattr *attr;
6098 struct nft_table *table;
6099 struct nft_set *set;
6103 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6106 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6107 genmask, NETLINK_CB(skb).portid);
6108 if (IS_ERR(table)) {
6109 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6110 return PTR_ERR(table);
6113 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6114 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6116 return PTR_ERR(set);
6118 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6121 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6123 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6124 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6129 if (nft_net->validate_state == NFT_VALIDATE_DO)
6130 return nft_table_validate(net, table);
6136 * nft_data_hold - hold a nft_data item
6138 * @data: struct nft_data to release
6139 * @type: type of data
6141 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6142 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6143 * NFT_GOTO verdicts. This function must be called on active data objects
6144 * from the second phase of the commit protocol.
6146 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6148 struct nft_chain *chain;
6149 struct nft_rule *rule;
6151 if (type == NFT_DATA_VERDICT) {
6152 switch (data->verdict.code) {
6155 chain = data->verdict.chain;
6158 if (!nft_chain_is_bound(chain))
6161 chain->table->use++;
6162 list_for_each_entry(rule, &chain->rules, list)
6165 nft_chain_add(chain->table, chain);
6171 static void nft_setelem_data_activate(const struct net *net,
6172 const struct nft_set *set,
6173 struct nft_set_elem *elem)
6175 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6177 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6178 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6179 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6180 (*nft_set_ext_obj(ext))->use++;
6183 static void nft_setelem_data_deactivate(const struct net *net,
6184 const struct nft_set *set,
6185 struct nft_set_elem *elem)
6187 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6189 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6190 nft_data_release(nft_set_ext_data(ext), set->dtype);
6191 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6192 (*nft_set_ext_obj(ext))->use--;
6195 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6196 const struct nlattr *attr)
6198 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6199 struct nft_set_ext_tmpl tmpl;
6200 struct nft_set_elem elem;
6201 struct nft_set_ext *ext;
6202 struct nft_trans *trans;
6206 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6207 nft_set_elem_policy, NULL);
6211 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6215 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6218 if (!nft_setelem_valid_key_end(set, nla, flags))
6221 nft_set_ext_prepare(&tmpl);
6224 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6229 if (nla[NFTA_SET_ELEM_KEY]) {
6230 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6231 nla[NFTA_SET_ELEM_KEY]);
6235 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6240 if (nla[NFTA_SET_ELEM_KEY_END]) {
6241 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6242 nla[NFTA_SET_ELEM_KEY_END]);
6246 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6248 goto fail_elem_key_end;
6252 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6253 elem.key_end.val.data, NULL, 0, 0,
6255 if (elem.priv == NULL)
6256 goto fail_elem_key_end;
6258 ext = nft_set_elem_ext(set, elem.priv);
6260 *nft_set_ext_flags(ext) = flags;
6262 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6266 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6270 nft_setelem_data_deactivate(ctx->net, set, &elem);
6272 nft_trans_elem(trans) = elem;
6273 nft_trans_commit_list_add_tail(ctx->net, trans);
6281 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6283 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6287 static int nft_setelem_flush(const struct nft_ctx *ctx,
6288 struct nft_set *set,
6289 const struct nft_set_iter *iter,
6290 struct nft_set_elem *elem)
6292 struct nft_trans *trans;
6295 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6296 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6300 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6306 nft_setelem_data_deactivate(ctx->net, set, elem);
6307 nft_trans_elem_set(trans) = set;
6308 nft_trans_elem(trans) = *elem;
6309 nft_trans_commit_list_add_tail(ctx->net, trans);
6317 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6318 struct nft_set *set,
6319 struct nft_set_elem *elem)
6321 struct nft_trans *trans;
6323 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6324 sizeof(struct nft_trans_elem), GFP_KERNEL);
6328 nft_setelem_data_deactivate(ctx->net, set, elem);
6329 nft_trans_elem_set(trans) = set;
6330 nft_trans_elem(trans) = *elem;
6331 nft_trans_commit_list_add_tail(ctx->net, trans);
6336 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6337 struct nft_set *set)
6339 u8 genmask = nft_genmask_next(ctx->net);
6340 struct nft_set_elem_catchall *catchall;
6341 struct nft_set_elem elem;
6342 struct nft_set_ext *ext;
6345 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6346 ext = nft_set_elem_ext(set, catchall->elem);
6347 if (!nft_set_elem_active(ext, genmask) ||
6348 nft_set_elem_mark_busy(ext))
6351 elem.priv = catchall->elem;
6352 ret = __nft_set_catchall_flush(ctx, set, &elem);
6360 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6362 struct nft_set_iter iter = {
6364 .fn = nft_setelem_flush,
6367 set->ops->walk(ctx, set, &iter);
6369 iter.err = nft_set_catchall_flush(ctx, set);
6374 static int nf_tables_delsetelem(struct sk_buff *skb,
6375 const struct nfnl_info *info,
6376 const struct nlattr * const nla[])
6378 struct netlink_ext_ack *extack = info->extack;
6379 u8 genmask = nft_genmask_next(info->net);
6380 u8 family = info->nfmsg->nfgen_family;
6381 struct net *net = info->net;
6382 const struct nlattr *attr;
6383 struct nft_table *table;
6384 struct nft_set *set;
6388 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6389 genmask, NETLINK_CB(skb).portid);
6390 if (IS_ERR(table)) {
6391 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6392 return PTR_ERR(table);
6395 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6397 return PTR_ERR(set);
6398 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6401 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6403 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6404 return nft_set_flush(&ctx, set, genmask);
6406 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6407 err = nft_del_setelem(&ctx, set, attr);
6414 void nft_set_gc_batch_release(struct rcu_head *rcu)
6416 struct nft_set_gc_batch *gcb;
6419 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6420 for (i = 0; i < gcb->head.cnt; i++)
6421 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6425 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6428 struct nft_set_gc_batch *gcb;
6430 gcb = kzalloc(sizeof(*gcb), gfp);
6433 gcb->head.set = set;
6442 * nft_register_obj- register nf_tables stateful object type
6443 * @obj_type: object type
6445 * Registers the object type for use with nf_tables. Returns zero on
6446 * success or a negative errno code otherwise.
6448 int nft_register_obj(struct nft_object_type *obj_type)
6450 if (obj_type->type == NFT_OBJECT_UNSPEC)
6453 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6454 list_add_rcu(&obj_type->list, &nf_tables_objects);
6455 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6458 EXPORT_SYMBOL_GPL(nft_register_obj);
6461 * nft_unregister_obj - unregister nf_tables object type
6462 * @obj_type: object type
6464 * Unregisters the object type for use with nf_tables.
6466 void nft_unregister_obj(struct nft_object_type *obj_type)
6468 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6469 list_del_rcu(&obj_type->list);
6470 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6472 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6474 struct nft_object *nft_obj_lookup(const struct net *net,
6475 const struct nft_table *table,
6476 const struct nlattr *nla, u32 objtype,
6479 struct nft_object_hash_key k = { .table = table };
6480 char search[NFT_OBJ_MAXNAMELEN];
6481 struct rhlist_head *tmp, *list;
6482 struct nft_object *obj;
6484 nla_strscpy(search, nla, sizeof(search));
6487 WARN_ON_ONCE(!rcu_read_lock_held() &&
6488 !lockdep_commit_lock_is_held(net));
6491 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6495 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6496 if (objtype == obj->ops->type->type &&
6497 nft_active_genmask(obj, genmask)) {
6504 return ERR_PTR(-ENOENT);
6506 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6508 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6509 const struct nlattr *nla,
6510 u32 objtype, u8 genmask)
6512 struct nft_object *obj;
6514 list_for_each_entry(obj, &table->objects, list) {
6515 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6516 objtype == obj->ops->type->type &&
6517 nft_active_genmask(obj, genmask))
6520 return ERR_PTR(-ENOENT);
6523 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6524 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6525 .len = NFT_TABLE_MAXNAMELEN - 1 },
6526 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6527 .len = NFT_OBJ_MAXNAMELEN - 1 },
6528 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6529 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6530 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6531 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6532 .len = NFT_USERDATA_MAXLEN },
6535 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6536 const struct nft_object_type *type,
6537 const struct nlattr *attr)
6540 const struct nft_object_ops *ops;
6541 struct nft_object *obj;
6544 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6549 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6550 type->policy, NULL);
6554 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6557 if (type->select_ops) {
6558 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6568 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL);
6572 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6585 return ERR_PTR(err);
6588 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6589 struct nft_object *obj, bool reset)
6591 struct nlattr *nest;
6593 nest = nla_nest_start_noflag(skb, attr);
6595 goto nla_put_failure;
6596 if (obj->ops->dump(skb, obj, reset) < 0)
6597 goto nla_put_failure;
6598 nla_nest_end(skb, nest);
6605 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6607 const struct nft_object_type *type;
6609 list_for_each_entry(type, &nf_tables_objects, list) {
6610 if (objtype == type->type)
6616 static const struct nft_object_type *
6617 nft_obj_type_get(struct net *net, u32 objtype)
6619 const struct nft_object_type *type;
6621 type = __nft_obj_type_get(objtype);
6622 if (type != NULL && try_module_get(type->owner))
6625 lockdep_nfnl_nft_mutex_not_held();
6626 #ifdef CONFIG_MODULES
6628 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6629 return ERR_PTR(-EAGAIN);
6632 return ERR_PTR(-ENOENT);
6635 static int nf_tables_updobj(const struct nft_ctx *ctx,
6636 const struct nft_object_type *type,
6637 const struct nlattr *attr,
6638 struct nft_object *obj)
6640 struct nft_object *newobj;
6641 struct nft_trans *trans;
6644 if (!try_module_get(type->owner))
6647 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6648 sizeof(struct nft_trans_obj));
6652 newobj = nft_obj_init(ctx, type, attr);
6653 if (IS_ERR(newobj)) {
6654 err = PTR_ERR(newobj);
6655 goto err_free_trans;
6658 nft_trans_obj(trans) = obj;
6659 nft_trans_obj_update(trans) = true;
6660 nft_trans_obj_newobj(trans) = newobj;
6661 nft_trans_commit_list_add_tail(ctx->net, trans);
6668 module_put(type->owner);
6672 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6673 const struct nlattr * const nla[])
6675 struct netlink_ext_ack *extack = info->extack;
6676 u8 genmask = nft_genmask_next(info->net);
6677 u8 family = info->nfmsg->nfgen_family;
6678 const struct nft_object_type *type;
6679 struct net *net = info->net;
6680 struct nft_table *table;
6681 struct nft_object *obj;
6686 if (!nla[NFTA_OBJ_TYPE] ||
6687 !nla[NFTA_OBJ_NAME] ||
6688 !nla[NFTA_OBJ_DATA])
6691 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6692 NETLINK_CB(skb).portid);
6693 if (IS_ERR(table)) {
6694 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6695 return PTR_ERR(table);
6698 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6699 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6702 if (err != -ENOENT) {
6703 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6707 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6708 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6711 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6714 type = __nft_obj_type_get(objtype);
6715 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6717 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6720 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6722 type = nft_obj_type_get(net, objtype);
6724 return PTR_ERR(type);
6726 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6731 obj->key.table = table;
6732 obj->handle = nf_tables_alloc_handle(table);
6734 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL);
6735 if (!obj->key.name) {
6740 if (nla[NFTA_OBJ_USERDATA]) {
6741 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6742 if (obj->udata == NULL)
6745 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6748 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6752 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6753 nft_objname_ht_params);
6757 list_add_tail_rcu(&obj->list, &table->objects);
6761 /* queued in transaction log */
6762 INIT_LIST_HEAD(&obj->list);
6767 kfree(obj->key.name);
6769 if (obj->ops->destroy)
6770 obj->ops->destroy(&ctx, obj);
6773 module_put(type->owner);
6777 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6778 u32 portid, u32 seq, int event, u32 flags,
6779 int family, const struct nft_table *table,
6780 struct nft_object *obj, bool reset)
6782 struct nlmsghdr *nlh;
6784 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6785 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6786 NFNETLINK_V0, nft_base_seq(net));
6788 goto nla_put_failure;
6790 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6791 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6792 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6793 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6794 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6795 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6797 goto nla_put_failure;
6800 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6801 goto nla_put_failure;
6803 nlmsg_end(skb, nlh);
6807 nlmsg_trim(skb, nlh);
6811 struct nft_obj_filter {
6816 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6818 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6819 const struct nft_table *table;
6820 unsigned int idx = 0, s_idx = cb->args[0];
6821 struct nft_obj_filter *filter = cb->data;
6822 struct net *net = sock_net(skb->sk);
6823 int family = nfmsg->nfgen_family;
6824 struct nftables_pernet *nft_net;
6825 struct nft_object *obj;
6828 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6832 nft_net = nft_pernet(net);
6833 cb->seq = READ_ONCE(nft_net->base_seq);
6835 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6836 if (family != NFPROTO_UNSPEC && family != table->family)
6839 list_for_each_entry_rcu(obj, &table->objects, list) {
6840 if (!nft_is_active(net, obj))
6845 memset(&cb->args[1], 0,
6846 sizeof(cb->args) - sizeof(cb->args[0]));
6847 if (filter && filter->table &&
6848 strcmp(filter->table, table->name))
6851 filter->type != NFT_OBJECT_UNSPEC &&
6852 obj->ops->type->type != filter->type)
6855 char *buf = kasprintf(GFP_ATOMIC,
6860 audit_log_nfcfg(buf,
6863 AUDIT_NFT_OP_OBJ_RESET,
6868 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6871 NLM_F_MULTI | NLM_F_APPEND,
6872 table->family, table,
6876 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6888 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6890 const struct nlattr * const *nla = cb->data;
6891 struct nft_obj_filter *filter = NULL;
6893 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6894 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6898 if (nla[NFTA_OBJ_TABLE]) {
6899 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6900 if (!filter->table) {
6906 if (nla[NFTA_OBJ_TYPE])
6907 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6914 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6916 struct nft_obj_filter *filter = cb->data;
6919 kfree(filter->table);
6926 /* called with rcu_read_lock held */
6927 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6928 const struct nlattr * const nla[])
6930 struct netlink_ext_ack *extack = info->extack;
6931 u8 genmask = nft_genmask_cur(info->net);
6932 u8 family = info->nfmsg->nfgen_family;
6933 const struct nft_table *table;
6934 struct net *net = info->net;
6935 struct nft_object *obj;
6936 struct sk_buff *skb2;
6941 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6942 struct netlink_dump_control c = {
6943 .start = nf_tables_dump_obj_start,
6944 .dump = nf_tables_dump_obj,
6945 .done = nf_tables_dump_obj_done,
6946 .module = THIS_MODULE,
6947 .data = (void *)nla,
6950 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6953 if (!nla[NFTA_OBJ_NAME] ||
6954 !nla[NFTA_OBJ_TYPE])
6957 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6958 if (IS_ERR(table)) {
6959 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6960 return PTR_ERR(table);
6963 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6964 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6966 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6967 return PTR_ERR(obj);
6970 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
6974 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6978 const struct nftables_pernet *nft_net;
6981 nft_net = nft_pernet(net);
6982 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
6984 audit_log_nfcfg(buf,
6987 AUDIT_NFT_OP_OBJ_RESET,
6992 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
6993 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
6994 family, table, obj, reset);
6996 goto err_fill_obj_info;
6998 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7005 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7007 if (obj->ops->destroy)
7008 obj->ops->destroy(ctx, obj);
7010 module_put(obj->ops->type->owner);
7011 kfree(obj->key.name);
7016 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7017 const struct nlattr * const nla[])
7019 struct netlink_ext_ack *extack = info->extack;
7020 u8 genmask = nft_genmask_next(info->net);
7021 u8 family = info->nfmsg->nfgen_family;
7022 struct net *net = info->net;
7023 const struct nlattr *attr;
7024 struct nft_table *table;
7025 struct nft_object *obj;
7029 if (!nla[NFTA_OBJ_TYPE] ||
7030 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7033 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7034 NETLINK_CB(skb).portid);
7035 if (IS_ERR(table)) {
7036 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7037 return PTR_ERR(table);
7040 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7041 if (nla[NFTA_OBJ_HANDLE]) {
7042 attr = nla[NFTA_OBJ_HANDLE];
7043 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7045 attr = nla[NFTA_OBJ_NAME];
7046 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7050 NL_SET_BAD_ATTR(extack, attr);
7051 return PTR_ERR(obj);
7054 NL_SET_BAD_ATTR(extack, attr);
7058 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7060 return nft_delobj(&ctx, obj);
7063 void nft_obj_notify(struct net *net, const struct nft_table *table,
7064 struct nft_object *obj, u32 portid, u32 seq, int event,
7065 u16 flags, int family, int report, gfp_t gfp)
7067 struct nftables_pernet *nft_net = nft_pernet(net);
7068 struct sk_buff *skb;
7070 char *buf = kasprintf(gfp, "%s:%u",
7071 table->name, nft_net->base_seq);
7073 audit_log_nfcfg(buf,
7076 event == NFT_MSG_NEWOBJ ?
7077 AUDIT_NFT_OP_OBJ_REGISTER :
7078 AUDIT_NFT_OP_OBJ_UNREGISTER,
7083 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7086 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7090 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7091 flags & (NLM_F_CREATE | NLM_F_EXCL),
7092 family, table, obj, false);
7098 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7101 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7103 EXPORT_SYMBOL_GPL(nft_obj_notify);
7105 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7106 struct nft_object *obj, int event)
7108 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7109 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7115 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7117 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7118 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7119 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7121 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7123 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7125 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7126 list_del_rcu(&type->list);
7127 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7129 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7131 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7132 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7133 .len = NFT_NAME_MAXLEN - 1 },
7134 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7135 .len = NFT_NAME_MAXLEN - 1 },
7136 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7137 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7138 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7141 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7142 const struct nlattr *nla, u8 genmask)
7144 struct nft_flowtable *flowtable;
7146 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7147 if (!nla_strcmp(nla, flowtable->name) &&
7148 nft_active_genmask(flowtable, genmask))
7151 return ERR_PTR(-ENOENT);
7153 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7155 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7156 struct nft_flowtable *flowtable,
7157 enum nft_trans_phase phase)
7160 case NFT_TRANS_PREPARE:
7161 case NFT_TRANS_ABORT:
7162 case NFT_TRANS_RELEASE:
7169 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7171 static struct nft_flowtable *
7172 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7173 const struct nlattr *nla, u8 genmask)
7175 struct nft_flowtable *flowtable;
7177 list_for_each_entry(flowtable, &table->flowtables, list) {
7178 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7179 nft_active_genmask(flowtable, genmask))
7182 return ERR_PTR(-ENOENT);
7185 struct nft_flowtable_hook {
7188 struct list_head list;
7191 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7192 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7193 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7194 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7197 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7198 const struct nlattr *attr,
7199 struct nft_flowtable_hook *flowtable_hook,
7200 struct nft_flowtable *flowtable, bool add)
7202 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7203 struct nft_hook *hook;
7204 int hooknum, priority;
7207 INIT_LIST_HEAD(&flowtable_hook->list);
7209 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7210 nft_flowtable_hook_policy, NULL);
7215 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7216 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7219 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7220 if (hooknum != NF_NETDEV_INGRESS)
7223 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7225 flowtable_hook->priority = priority;
7226 flowtable_hook->num = hooknum;
7228 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7229 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7230 if (hooknum != flowtable->hooknum)
7234 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7235 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7236 if (priority != flowtable->data.priority)
7240 flowtable_hook->priority = flowtable->data.priority;
7241 flowtable_hook->num = flowtable->hooknum;
7244 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7245 err = nf_tables_parse_netdev_hooks(ctx->net,
7246 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7247 &flowtable_hook->list);
7252 list_for_each_entry(hook, &flowtable_hook->list, list) {
7253 hook->ops.pf = NFPROTO_NETDEV;
7254 hook->ops.hooknum = flowtable_hook->num;
7255 hook->ops.priority = flowtable_hook->priority;
7256 hook->ops.priv = &flowtable->data;
7257 hook->ops.hook = flowtable->data.type->hook;
7263 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7265 const struct nf_flowtable_type *type;
7267 list_for_each_entry(type, &nf_tables_flowtables, list) {
7268 if (family == type->family)
7274 static const struct nf_flowtable_type *
7275 nft_flowtable_type_get(struct net *net, u8 family)
7277 const struct nf_flowtable_type *type;
7279 type = __nft_flowtable_type_get(family);
7280 if (type != NULL && try_module_get(type->owner))
7283 lockdep_nfnl_nft_mutex_not_held();
7284 #ifdef CONFIG_MODULES
7286 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7287 return ERR_PTR(-EAGAIN);
7290 return ERR_PTR(-ENOENT);
7293 /* Only called from error and netdev event paths. */
7294 static void nft_unregister_flowtable_hook(struct net *net,
7295 struct nft_flowtable *flowtable,
7296 struct nft_hook *hook)
7298 nf_unregister_net_hook(net, &hook->ops);
7299 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7303 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7304 struct list_head *hook_list,
7305 bool release_netdev)
7307 struct nft_hook *hook, *next;
7309 list_for_each_entry_safe(hook, next, hook_list, list) {
7310 nf_unregister_net_hook(net, &hook->ops);
7311 if (release_netdev) {
7312 list_del(&hook->list);
7313 kfree_rcu(hook, rcu);
7318 static void nft_unregister_flowtable_net_hooks(struct net *net,
7319 struct list_head *hook_list)
7321 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7324 static int nft_register_flowtable_net_hooks(struct net *net,
7325 struct nft_table *table,
7326 struct list_head *hook_list,
7327 struct nft_flowtable *flowtable)
7329 struct nft_hook *hook, *hook2, *next;
7330 struct nft_flowtable *ft;
7333 list_for_each_entry(hook, hook_list, list) {
7334 list_for_each_entry(ft, &table->flowtables, list) {
7335 if (!nft_is_active_next(net, ft))
7338 list_for_each_entry(hook2, &ft->hook_list, list) {
7339 if (hook->ops.dev == hook2->ops.dev &&
7340 hook->ops.pf == hook2->ops.pf) {
7342 goto err_unregister_net_hooks;
7347 err = flowtable->data.type->setup(&flowtable->data,
7351 goto err_unregister_net_hooks;
7353 err = nf_register_net_hook(net, &hook->ops);
7355 flowtable->data.type->setup(&flowtable->data,
7358 goto err_unregister_net_hooks;
7366 err_unregister_net_hooks:
7367 list_for_each_entry_safe(hook, next, hook_list, list) {
7371 nft_unregister_flowtable_hook(net, flowtable, hook);
7372 list_del_rcu(&hook->list);
7373 kfree_rcu(hook, rcu);
7379 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7381 struct nft_hook *hook, *next;
7383 list_for_each_entry_safe(hook, next, hook_list, list) {
7384 list_del_rcu(&hook->list);
7385 kfree_rcu(hook, rcu);
7389 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7390 struct nft_flowtable *flowtable)
7392 const struct nlattr * const *nla = ctx->nla;
7393 struct nft_flowtable_hook flowtable_hook;
7394 struct nft_hook *hook, *next;
7395 struct nft_trans *trans;
7396 bool unregister = false;
7400 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7401 &flowtable_hook, flowtable, false);
7405 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7406 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7407 list_del(&hook->list);
7412 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7413 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7414 if (flags & ~NFT_FLOWTABLE_MASK) {
7416 goto err_flowtable_update_hook;
7418 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7419 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7421 goto err_flowtable_update_hook;
7424 flags = flowtable->data.flags;
7427 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7428 &flowtable_hook.list, flowtable);
7430 goto err_flowtable_update_hook;
7432 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7433 sizeof(struct nft_trans_flowtable));
7437 goto err_flowtable_update_hook;
7440 nft_trans_flowtable_flags(trans) = flags;
7441 nft_trans_flowtable(trans) = flowtable;
7442 nft_trans_flowtable_update(trans) = true;
7443 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7444 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7446 nft_trans_commit_list_add_tail(ctx->net, trans);
7450 err_flowtable_update_hook:
7451 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7453 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7454 list_del_rcu(&hook->list);
7455 kfree_rcu(hook, rcu);
7462 static int nf_tables_newflowtable(struct sk_buff *skb,
7463 const struct nfnl_info *info,
7464 const struct nlattr * const nla[])
7466 struct netlink_ext_ack *extack = info->extack;
7467 struct nft_flowtable_hook flowtable_hook;
7468 u8 genmask = nft_genmask_next(info->net);
7469 u8 family = info->nfmsg->nfgen_family;
7470 const struct nf_flowtable_type *type;
7471 struct nft_flowtable *flowtable;
7472 struct nft_hook *hook, *next;
7473 struct net *net = info->net;
7474 struct nft_table *table;
7478 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7479 !nla[NFTA_FLOWTABLE_NAME] ||
7480 !nla[NFTA_FLOWTABLE_HOOK])
7483 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7484 genmask, NETLINK_CB(skb).portid);
7485 if (IS_ERR(table)) {
7486 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7487 return PTR_ERR(table);
7490 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7492 if (IS_ERR(flowtable)) {
7493 err = PTR_ERR(flowtable);
7494 if (err != -ENOENT) {
7495 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7499 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7500 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7504 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7506 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7509 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7511 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL);
7515 flowtable->table = table;
7516 flowtable->handle = nf_tables_alloc_handle(table);
7517 INIT_LIST_HEAD(&flowtable->hook_list);
7519 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL);
7520 if (!flowtable->name) {
7525 type = nft_flowtable_type_get(net, family);
7527 err = PTR_ERR(type);
7531 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7532 flowtable->data.flags =
7533 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7534 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7540 write_pnet(&flowtable->data.net, net);
7541 flowtable->data.type = type;
7542 err = type->init(&flowtable->data);
7546 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7547 &flowtable_hook, flowtable, true);
7551 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7552 flowtable->data.priority = flowtable_hook.priority;
7553 flowtable->hooknum = flowtable_hook.num;
7555 err = nft_register_flowtable_net_hooks(ctx.net, table,
7556 &flowtable->hook_list,
7559 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7563 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7567 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7572 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7573 nft_unregister_flowtable_hook(net, flowtable, hook);
7574 list_del_rcu(&hook->list);
7575 kfree_rcu(hook, rcu);
7578 flowtable->data.type->free(&flowtable->data);
7580 module_put(type->owner);
7582 kfree(flowtable->name);
7588 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7590 struct nft_hook *this, *next;
7592 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7593 list_del(&this->list);
7598 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7599 struct nft_flowtable *flowtable)
7601 const struct nlattr * const *nla = ctx->nla;
7602 struct nft_flowtable_hook flowtable_hook;
7603 LIST_HEAD(flowtable_del_list);
7604 struct nft_hook *this, *hook;
7605 struct nft_trans *trans;
7608 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7609 &flowtable_hook, flowtable, false);
7613 list_for_each_entry(this, &flowtable_hook.list, list) {
7614 hook = nft_hook_list_find(&flowtable->hook_list, this);
7617 goto err_flowtable_del_hook;
7619 list_move(&hook->list, &flowtable_del_list);
7622 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7623 sizeof(struct nft_trans_flowtable));
7626 goto err_flowtable_del_hook;
7629 nft_trans_flowtable(trans) = flowtable;
7630 nft_trans_flowtable_update(trans) = true;
7631 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7632 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7633 nft_flowtable_hook_release(&flowtable_hook);
7635 nft_trans_commit_list_add_tail(ctx->net, trans);
7639 err_flowtable_del_hook:
7640 list_splice(&flowtable_del_list, &flowtable->hook_list);
7641 nft_flowtable_hook_release(&flowtable_hook);
7646 static int nf_tables_delflowtable(struct sk_buff *skb,
7647 const struct nfnl_info *info,
7648 const struct nlattr * const nla[])
7650 struct netlink_ext_ack *extack = info->extack;
7651 u8 genmask = nft_genmask_next(info->net);
7652 u8 family = info->nfmsg->nfgen_family;
7653 struct nft_flowtable *flowtable;
7654 struct net *net = info->net;
7655 const struct nlattr *attr;
7656 struct nft_table *table;
7659 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7660 (!nla[NFTA_FLOWTABLE_NAME] &&
7661 !nla[NFTA_FLOWTABLE_HANDLE]))
7664 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7665 genmask, NETLINK_CB(skb).portid);
7666 if (IS_ERR(table)) {
7667 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7668 return PTR_ERR(table);
7671 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7672 attr = nla[NFTA_FLOWTABLE_HANDLE];
7673 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7675 attr = nla[NFTA_FLOWTABLE_NAME];
7676 flowtable = nft_flowtable_lookup(table, attr, genmask);
7679 if (IS_ERR(flowtable)) {
7680 NL_SET_BAD_ATTR(extack, attr);
7681 return PTR_ERR(flowtable);
7684 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7686 if (nla[NFTA_FLOWTABLE_HOOK])
7687 return nft_delflowtable_hook(&ctx, flowtable);
7689 if (flowtable->use > 0) {
7690 NL_SET_BAD_ATTR(extack, attr);
7694 return nft_delflowtable(&ctx, flowtable);
7697 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7698 u32 portid, u32 seq, int event,
7699 u32 flags, int family,
7700 struct nft_flowtable *flowtable,
7701 struct list_head *hook_list)
7703 struct nlattr *nest, *nest_devs;
7704 struct nft_hook *hook;
7705 struct nlmsghdr *nlh;
7707 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7708 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7709 NFNETLINK_V0, nft_base_seq(net));
7711 goto nla_put_failure;
7713 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7714 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7715 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7716 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7717 NFTA_FLOWTABLE_PAD) ||
7718 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7719 goto nla_put_failure;
7721 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7723 goto nla_put_failure;
7724 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7725 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7726 goto nla_put_failure;
7728 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7730 goto nla_put_failure;
7732 list_for_each_entry_rcu(hook, hook_list, list) {
7733 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7734 goto nla_put_failure;
7736 nla_nest_end(skb, nest_devs);
7737 nla_nest_end(skb, nest);
7739 nlmsg_end(skb, nlh);
7743 nlmsg_trim(skb, nlh);
7747 struct nft_flowtable_filter {
7751 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7752 struct netlink_callback *cb)
7754 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7755 struct nft_flowtable_filter *filter = cb->data;
7756 unsigned int idx = 0, s_idx = cb->args[0];
7757 struct net *net = sock_net(skb->sk);
7758 int family = nfmsg->nfgen_family;
7759 struct nft_flowtable *flowtable;
7760 struct nftables_pernet *nft_net;
7761 const struct nft_table *table;
7764 nft_net = nft_pernet(net);
7765 cb->seq = READ_ONCE(nft_net->base_seq);
7767 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7768 if (family != NFPROTO_UNSPEC && family != table->family)
7771 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7772 if (!nft_is_active(net, flowtable))
7777 memset(&cb->args[1], 0,
7778 sizeof(cb->args) - sizeof(cb->args[0]));
7779 if (filter && filter->table &&
7780 strcmp(filter->table, table->name))
7783 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7785 NFT_MSG_NEWFLOWTABLE,
7786 NLM_F_MULTI | NLM_F_APPEND,
7789 &flowtable->hook_list) < 0)
7792 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7804 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7806 const struct nlattr * const *nla = cb->data;
7807 struct nft_flowtable_filter *filter = NULL;
7809 if (nla[NFTA_FLOWTABLE_TABLE]) {
7810 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7814 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7816 if (!filter->table) {
7826 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7828 struct nft_flowtable_filter *filter = cb->data;
7833 kfree(filter->table);
7839 /* called with rcu_read_lock held */
7840 static int nf_tables_getflowtable(struct sk_buff *skb,
7841 const struct nfnl_info *info,
7842 const struct nlattr * const nla[])
7844 u8 genmask = nft_genmask_cur(info->net);
7845 u8 family = info->nfmsg->nfgen_family;
7846 struct nft_flowtable *flowtable;
7847 const struct nft_table *table;
7848 struct net *net = info->net;
7849 struct sk_buff *skb2;
7852 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7853 struct netlink_dump_control c = {
7854 .start = nf_tables_dump_flowtable_start,
7855 .dump = nf_tables_dump_flowtable,
7856 .done = nf_tables_dump_flowtable_done,
7857 .module = THIS_MODULE,
7858 .data = (void *)nla,
7861 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7864 if (!nla[NFTA_FLOWTABLE_NAME])
7867 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7870 return PTR_ERR(table);
7872 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7874 if (IS_ERR(flowtable))
7875 return PTR_ERR(flowtable);
7877 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7881 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7882 info->nlh->nlmsg_seq,
7883 NFT_MSG_NEWFLOWTABLE, 0, family,
7884 flowtable, &flowtable->hook_list);
7886 goto err_fill_flowtable_info;
7888 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7890 err_fill_flowtable_info:
7895 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7896 struct nft_flowtable *flowtable,
7897 struct list_head *hook_list,
7900 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7901 struct sk_buff *skb;
7906 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7909 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7913 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7914 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7916 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7917 ctx->seq, event, flags,
7918 ctx->family, flowtable, hook_list);
7924 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7927 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7930 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7932 struct nft_hook *hook, *next;
7934 flowtable->data.type->free(&flowtable->data);
7935 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7936 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7938 list_del_rcu(&hook->list);
7941 kfree(flowtable->name);
7942 module_put(flowtable->data.type->owner);
7946 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7947 u32 portid, u32 seq)
7949 struct nftables_pernet *nft_net = nft_pernet(net);
7950 struct nlmsghdr *nlh;
7951 char buf[TASK_COMM_LEN];
7952 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7954 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7955 NFNETLINK_V0, nft_base_seq(net));
7957 goto nla_put_failure;
7959 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7960 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7961 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7962 goto nla_put_failure;
7964 nlmsg_end(skb, nlh);
7968 nlmsg_trim(skb, nlh);
7972 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
7973 struct nft_flowtable *flowtable)
7975 struct nft_hook *hook;
7977 list_for_each_entry(hook, &flowtable->hook_list, list) {
7978 if (hook->ops.dev != dev)
7981 /* flow_offload_netdev_event() cleans up entries for us. */
7982 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
7983 list_del_rcu(&hook->list);
7984 kfree_rcu(hook, rcu);
7989 static int nf_tables_flowtable_event(struct notifier_block *this,
7990 unsigned long event, void *ptr)
7992 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
7993 struct nft_flowtable *flowtable;
7994 struct nftables_pernet *nft_net;
7995 struct nft_table *table;
7998 if (event != NETDEV_UNREGISTER)
8002 nft_net = nft_pernet(net);
8003 mutex_lock(&nft_net->commit_mutex);
8004 list_for_each_entry(table, &nft_net->tables, list) {
8005 list_for_each_entry(flowtable, &table->flowtables, list) {
8006 nft_flowtable_event(event, dev, flowtable);
8009 mutex_unlock(&nft_net->commit_mutex);
8014 static struct notifier_block nf_tables_flowtable_notifier = {
8015 .notifier_call = nf_tables_flowtable_event,
8018 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8021 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8022 struct sk_buff *skb2;
8025 if (!nlmsg_report(nlh) &&
8026 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8029 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8033 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8040 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8041 nlmsg_report(nlh), GFP_KERNEL);
8044 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8048 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8049 const struct nlattr * const nla[])
8051 struct sk_buff *skb2;
8054 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8058 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8059 info->nlh->nlmsg_seq);
8061 goto err_fill_gen_info;
8063 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8070 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8071 [NFT_MSG_NEWTABLE] = {
8072 .call = nf_tables_newtable,
8073 .type = NFNL_CB_BATCH,
8074 .attr_count = NFTA_TABLE_MAX,
8075 .policy = nft_table_policy,
8077 [NFT_MSG_GETTABLE] = {
8078 .call = nf_tables_gettable,
8079 .type = NFNL_CB_RCU,
8080 .attr_count = NFTA_TABLE_MAX,
8081 .policy = nft_table_policy,
8083 [NFT_MSG_DELTABLE] = {
8084 .call = nf_tables_deltable,
8085 .type = NFNL_CB_BATCH,
8086 .attr_count = NFTA_TABLE_MAX,
8087 .policy = nft_table_policy,
8089 [NFT_MSG_NEWCHAIN] = {
8090 .call = nf_tables_newchain,
8091 .type = NFNL_CB_BATCH,
8092 .attr_count = NFTA_CHAIN_MAX,
8093 .policy = nft_chain_policy,
8095 [NFT_MSG_GETCHAIN] = {
8096 .call = nf_tables_getchain,
8097 .type = NFNL_CB_RCU,
8098 .attr_count = NFTA_CHAIN_MAX,
8099 .policy = nft_chain_policy,
8101 [NFT_MSG_DELCHAIN] = {
8102 .call = nf_tables_delchain,
8103 .type = NFNL_CB_BATCH,
8104 .attr_count = NFTA_CHAIN_MAX,
8105 .policy = nft_chain_policy,
8107 [NFT_MSG_NEWRULE] = {
8108 .call = nf_tables_newrule,
8109 .type = NFNL_CB_BATCH,
8110 .attr_count = NFTA_RULE_MAX,
8111 .policy = nft_rule_policy,
8113 [NFT_MSG_GETRULE] = {
8114 .call = nf_tables_getrule,
8115 .type = NFNL_CB_RCU,
8116 .attr_count = NFTA_RULE_MAX,
8117 .policy = nft_rule_policy,
8119 [NFT_MSG_DELRULE] = {
8120 .call = nf_tables_delrule,
8121 .type = NFNL_CB_BATCH,
8122 .attr_count = NFTA_RULE_MAX,
8123 .policy = nft_rule_policy,
8125 [NFT_MSG_NEWSET] = {
8126 .call = nf_tables_newset,
8127 .type = NFNL_CB_BATCH,
8128 .attr_count = NFTA_SET_MAX,
8129 .policy = nft_set_policy,
8131 [NFT_MSG_GETSET] = {
8132 .call = nf_tables_getset,
8133 .type = NFNL_CB_RCU,
8134 .attr_count = NFTA_SET_MAX,
8135 .policy = nft_set_policy,
8137 [NFT_MSG_DELSET] = {
8138 .call = nf_tables_delset,
8139 .type = NFNL_CB_BATCH,
8140 .attr_count = NFTA_SET_MAX,
8141 .policy = nft_set_policy,
8143 [NFT_MSG_NEWSETELEM] = {
8144 .call = nf_tables_newsetelem,
8145 .type = NFNL_CB_BATCH,
8146 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8147 .policy = nft_set_elem_list_policy,
8149 [NFT_MSG_GETSETELEM] = {
8150 .call = nf_tables_getsetelem,
8151 .type = NFNL_CB_RCU,
8152 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8153 .policy = nft_set_elem_list_policy,
8155 [NFT_MSG_DELSETELEM] = {
8156 .call = nf_tables_delsetelem,
8157 .type = NFNL_CB_BATCH,
8158 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8159 .policy = nft_set_elem_list_policy,
8161 [NFT_MSG_GETGEN] = {
8162 .call = nf_tables_getgen,
8163 .type = NFNL_CB_RCU,
8165 [NFT_MSG_NEWOBJ] = {
8166 .call = nf_tables_newobj,
8167 .type = NFNL_CB_BATCH,
8168 .attr_count = NFTA_OBJ_MAX,
8169 .policy = nft_obj_policy,
8171 [NFT_MSG_GETOBJ] = {
8172 .call = nf_tables_getobj,
8173 .type = NFNL_CB_RCU,
8174 .attr_count = NFTA_OBJ_MAX,
8175 .policy = nft_obj_policy,
8177 [NFT_MSG_DELOBJ] = {
8178 .call = nf_tables_delobj,
8179 .type = NFNL_CB_BATCH,
8180 .attr_count = NFTA_OBJ_MAX,
8181 .policy = nft_obj_policy,
8183 [NFT_MSG_GETOBJ_RESET] = {
8184 .call = nf_tables_getobj,
8185 .type = NFNL_CB_RCU,
8186 .attr_count = NFTA_OBJ_MAX,
8187 .policy = nft_obj_policy,
8189 [NFT_MSG_NEWFLOWTABLE] = {
8190 .call = nf_tables_newflowtable,
8191 .type = NFNL_CB_BATCH,
8192 .attr_count = NFTA_FLOWTABLE_MAX,
8193 .policy = nft_flowtable_policy,
8195 [NFT_MSG_GETFLOWTABLE] = {
8196 .call = nf_tables_getflowtable,
8197 .type = NFNL_CB_RCU,
8198 .attr_count = NFTA_FLOWTABLE_MAX,
8199 .policy = nft_flowtable_policy,
8201 [NFT_MSG_DELFLOWTABLE] = {
8202 .call = nf_tables_delflowtable,
8203 .type = NFNL_CB_BATCH,
8204 .attr_count = NFTA_FLOWTABLE_MAX,
8205 .policy = nft_flowtable_policy,
8209 static int nf_tables_validate(struct net *net)
8211 struct nftables_pernet *nft_net = nft_pernet(net);
8212 struct nft_table *table;
8214 switch (nft_net->validate_state) {
8215 case NFT_VALIDATE_SKIP:
8217 case NFT_VALIDATE_NEED:
8218 nft_validate_state_update(net, NFT_VALIDATE_DO);
8220 case NFT_VALIDATE_DO:
8221 list_for_each_entry(table, &nft_net->tables, list) {
8222 if (nft_table_validate(net, table) < 0)
8231 /* a drop policy has to be deferred until all rules have been activated,
8232 * otherwise a large ruleset that contains a drop-policy base chain will
8233 * cause all packets to get dropped until the full transaction has been
8236 * We defer the drop policy until the transaction has been finalized.
8238 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8240 struct nft_base_chain *basechain;
8242 if (nft_trans_chain_policy(trans) != NF_DROP)
8245 if (!nft_is_base_chain(trans->ctx.chain))
8248 basechain = nft_base_chain(trans->ctx.chain);
8249 basechain->policy = NF_DROP;
8252 static void nft_chain_commit_update(struct nft_trans *trans)
8254 struct nft_base_chain *basechain;
8256 if (nft_trans_chain_name(trans)) {
8257 rhltable_remove(&trans->ctx.table->chains_ht,
8258 &trans->ctx.chain->rhlhead,
8259 nft_chain_ht_params);
8260 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8261 rhltable_insert_key(&trans->ctx.table->chains_ht,
8262 trans->ctx.chain->name,
8263 &trans->ctx.chain->rhlhead,
8264 nft_chain_ht_params);
8267 if (!nft_is_base_chain(trans->ctx.chain))
8270 nft_chain_stats_replace(trans);
8272 basechain = nft_base_chain(trans->ctx.chain);
8274 switch (nft_trans_chain_policy(trans)) {
8277 basechain->policy = nft_trans_chain_policy(trans);
8282 static void nft_obj_commit_update(struct nft_trans *trans)
8284 struct nft_object *newobj;
8285 struct nft_object *obj;
8287 obj = nft_trans_obj(trans);
8288 newobj = nft_trans_obj_newobj(trans);
8290 if (obj->ops->update)
8291 obj->ops->update(obj, newobj);
8293 nft_obj_destroy(&trans->ctx, newobj);
8296 static void nft_commit_release(struct nft_trans *trans)
8298 switch (trans->msg_type) {
8299 case NFT_MSG_DELTABLE:
8300 nf_tables_table_destroy(&trans->ctx);
8302 case NFT_MSG_NEWCHAIN:
8303 free_percpu(nft_trans_chain_stats(trans));
8304 kfree(nft_trans_chain_name(trans));
8306 case NFT_MSG_DELCHAIN:
8307 nf_tables_chain_destroy(&trans->ctx);
8309 case NFT_MSG_DELRULE:
8310 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8311 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8313 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8315 case NFT_MSG_DELSET:
8316 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8318 case NFT_MSG_DELSETELEM:
8319 nf_tables_set_elem_destroy(&trans->ctx,
8320 nft_trans_elem_set(trans),
8321 nft_trans_elem(trans).priv);
8323 case NFT_MSG_DELOBJ:
8324 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8326 case NFT_MSG_DELFLOWTABLE:
8327 if (nft_trans_flowtable_update(trans))
8328 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8330 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8335 put_net(trans->ctx.net);
8340 static void nf_tables_trans_destroy_work(struct work_struct *w)
8342 struct nft_trans *trans, *next;
8345 spin_lock(&nf_tables_destroy_list_lock);
8346 list_splice_init(&nf_tables_destroy_list, &head);
8347 spin_unlock(&nf_tables_destroy_list_lock);
8349 if (list_empty(&head))
8354 list_for_each_entry_safe(trans, next, &head, list) {
8355 list_del(&trans->list);
8356 nft_commit_release(trans);
8360 void nf_tables_trans_destroy_flush_work(void)
8362 flush_work(&trans_destroy_work);
8364 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8366 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8368 struct nft_rule *rule;
8369 unsigned int alloc = 0;
8372 /* already handled or inactive chain? */
8373 if (chain->rules_next || !nft_is_active_next(net, chain))
8376 rule = list_entry(&chain->rules, struct nft_rule, list);
8379 list_for_each_entry_continue(rule, &chain->rules, list) {
8380 if (nft_is_active_next(net, rule))
8384 chain->rules_next = nf_tables_chain_alloc_rules(chain, alloc);
8385 if (!chain->rules_next)
8388 list_for_each_entry_continue(rule, &chain->rules, list) {
8389 if (nft_is_active_next(net, rule))
8390 chain->rules_next[i++] = rule;
8393 chain->rules_next[i] = NULL;
8397 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8399 struct nftables_pernet *nft_net = nft_pernet(net);
8400 struct nft_trans *trans, *next;
8402 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8403 struct nft_chain *chain = trans->ctx.chain;
8405 if (trans->msg_type == NFT_MSG_NEWRULE ||
8406 trans->msg_type == NFT_MSG_DELRULE) {
8407 kvfree(chain->rules_next);
8408 chain->rules_next = NULL;
8413 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8415 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8420 static void nf_tables_commit_chain_free_rules_old(struct nft_rule **rules)
8422 struct nft_rule **r = rules;
8423 struct nft_rules_old *old;
8428 r++; /* rcu_head is after end marker */
8432 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8435 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8437 struct nft_rule **g0, **g1;
8440 next_genbit = nft_gencursor_next(net);
8442 g0 = rcu_dereference_protected(chain->rules_gen_0,
8443 lockdep_commit_lock_is_held(net));
8444 g1 = rcu_dereference_protected(chain->rules_gen_1,
8445 lockdep_commit_lock_is_held(net));
8447 /* No changes to this chain? */
8448 if (chain->rules_next == NULL) {
8449 /* chain had no change in last or next generation */
8453 * chain had no change in this generation; make sure next
8454 * one uses same rules as current generation.
8457 rcu_assign_pointer(chain->rules_gen_1, g0);
8458 nf_tables_commit_chain_free_rules_old(g1);
8460 rcu_assign_pointer(chain->rules_gen_0, g1);
8461 nf_tables_commit_chain_free_rules_old(g0);
8468 rcu_assign_pointer(chain->rules_gen_1, chain->rules_next);
8470 rcu_assign_pointer(chain->rules_gen_0, chain->rules_next);
8472 chain->rules_next = NULL;
8478 nf_tables_commit_chain_free_rules_old(g1);
8480 nf_tables_commit_chain_free_rules_old(g0);
8483 static void nft_obj_del(struct nft_object *obj)
8485 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8486 list_del_rcu(&obj->list);
8489 void nft_chain_del(struct nft_chain *chain)
8491 struct nft_table *table = chain->table;
8493 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8494 nft_chain_ht_params));
8495 list_del_rcu(&chain->list);
8498 static void nf_tables_module_autoload_cleanup(struct net *net)
8500 struct nftables_pernet *nft_net = nft_pernet(net);
8501 struct nft_module_request *req, *next;
8503 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8504 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8505 WARN_ON_ONCE(!req->done);
8506 list_del(&req->list);
8511 static void nf_tables_commit_release(struct net *net)
8513 struct nftables_pernet *nft_net = nft_pernet(net);
8514 struct nft_trans *trans;
8516 /* all side effects have to be made visible.
8517 * For example, if a chain named 'foo' has been deleted, a
8518 * new transaction must not find it anymore.
8520 * Memory reclaim happens asynchronously from work queue
8521 * to prevent expensive synchronize_rcu() in commit phase.
8523 if (list_empty(&nft_net->commit_list)) {
8524 nf_tables_module_autoload_cleanup(net);
8525 mutex_unlock(&nft_net->commit_mutex);
8529 trans = list_last_entry(&nft_net->commit_list,
8530 struct nft_trans, list);
8531 get_net(trans->ctx.net);
8532 WARN_ON_ONCE(trans->put_net);
8534 trans->put_net = true;
8535 spin_lock(&nf_tables_destroy_list_lock);
8536 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8537 spin_unlock(&nf_tables_destroy_list_lock);
8539 nf_tables_module_autoload_cleanup(net);
8540 schedule_work(&trans_destroy_work);
8542 mutex_unlock(&nft_net->commit_mutex);
8545 static void nft_commit_notify(struct net *net, u32 portid)
8547 struct nftables_pernet *nft_net = nft_pernet(net);
8548 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8549 unsigned char *data;
8552 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8556 len = NLMSG_GOODSIZE - skb->len;
8557 list_del(&skb->list);
8561 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8562 data = skb_put(batch_skb, skb->len);
8563 memcpy(data, skb->data, skb->len);
8564 list_del(&skb->list);
8568 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8569 NFT_CB(batch_skb).report, GFP_KERNEL);
8574 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8575 NFT_CB(batch_skb).report, GFP_KERNEL);
8578 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8581 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8582 struct nft_table *table)
8584 struct nft_audit_data *adp;
8586 list_for_each_entry(adp, adl, list) {
8587 if (adp->table == table)
8590 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8594 list_add(&adp->list, adl);
8598 static void nf_tables_commit_audit_free(struct list_head *adl)
8600 struct nft_audit_data *adp, *adn;
8602 list_for_each_entry_safe(adp, adn, adl, list) {
8603 list_del(&adp->list);
8608 static void nf_tables_commit_audit_collect(struct list_head *adl,
8609 struct nft_table *table, u32 op)
8611 struct nft_audit_data *adp;
8613 list_for_each_entry(adp, adl, list) {
8614 if (adp->table == table)
8617 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8621 if (!adp->op || adp->op > op)
8625 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8627 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8629 struct nft_audit_data *adp, *adn;
8630 char aubuf[AUNFTABLENAMELEN];
8632 list_for_each_entry_safe(adp, adn, adl, list) {
8633 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8635 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8636 nft2audit_op[adp->op], GFP_KERNEL);
8637 list_del(&adp->list);
8642 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8644 struct nftables_pernet *nft_net = nft_pernet(net);
8645 struct nft_trans *trans, *next;
8646 struct nft_trans_elem *te;
8647 struct nft_chain *chain;
8648 struct nft_table *table;
8649 unsigned int base_seq;
8653 if (list_empty(&nft_net->commit_list)) {
8654 mutex_unlock(&nft_net->commit_mutex);
8658 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8659 if (nf_tables_validate(net) < 0)
8662 err = nft_flow_rule_offload_commit(net);
8666 /* 1. Allocate space for next generation rules_gen_X[] */
8667 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8670 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8672 nf_tables_commit_chain_prepare_cancel(net);
8673 nf_tables_commit_audit_free(&adl);
8676 if (trans->msg_type == NFT_MSG_NEWRULE ||
8677 trans->msg_type == NFT_MSG_DELRULE) {
8678 chain = trans->ctx.chain;
8680 ret = nf_tables_commit_chain_prepare(net, chain);
8682 nf_tables_commit_chain_prepare_cancel(net);
8683 nf_tables_commit_audit_free(&adl);
8689 /* step 2. Make rules_gen_X visible to packet path */
8690 list_for_each_entry(table, &nft_net->tables, list) {
8691 list_for_each_entry(chain, &table->chains, list)
8692 nf_tables_commit_chain(net, chain);
8696 * Bump generation counter, invalidate any dump in progress.
8697 * Cannot fail after this point.
8699 base_seq = READ_ONCE(nft_net->base_seq);
8700 while (++base_seq == 0)
8703 WRITE_ONCE(nft_net->base_seq, base_seq);
8705 /* step 3. Start new generation, rules_gen_X now in use. */
8706 net->nft.gencursor = nft_gencursor_next(net);
8708 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8709 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8711 switch (trans->msg_type) {
8712 case NFT_MSG_NEWTABLE:
8713 if (nft_trans_table_update(trans)) {
8714 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8715 nft_trans_destroy(trans);
8718 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8719 nf_tables_table_disable(net, trans->ctx.table);
8721 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8723 nft_clear(net, trans->ctx.table);
8725 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8726 nft_trans_destroy(trans);
8728 case NFT_MSG_DELTABLE:
8729 list_del_rcu(&trans->ctx.table->list);
8730 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8732 case NFT_MSG_NEWCHAIN:
8733 if (nft_trans_chain_update(trans)) {
8734 nft_chain_commit_update(trans);
8735 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8736 /* trans destroyed after rcu grace period */
8738 nft_chain_commit_drop_policy(trans);
8739 nft_clear(net, trans->ctx.chain);
8740 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8741 nft_trans_destroy(trans);
8744 case NFT_MSG_DELCHAIN:
8745 nft_chain_del(trans->ctx.chain);
8746 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8747 nf_tables_unregister_hook(trans->ctx.net,
8751 case NFT_MSG_NEWRULE:
8752 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8753 nf_tables_rule_notify(&trans->ctx,
8754 nft_trans_rule(trans),
8756 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8757 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8759 nft_trans_destroy(trans);
8761 case NFT_MSG_DELRULE:
8762 list_del_rcu(&nft_trans_rule(trans)->list);
8763 nf_tables_rule_notify(&trans->ctx,
8764 nft_trans_rule(trans),
8766 nft_rule_expr_deactivate(&trans->ctx,
8767 nft_trans_rule(trans),
8770 case NFT_MSG_NEWSET:
8771 nft_clear(net, nft_trans_set(trans));
8772 /* This avoids hitting -EBUSY when deleting the table
8773 * from the transaction.
8775 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8776 !list_empty(&nft_trans_set(trans)->bindings))
8777 trans->ctx.table->use--;
8779 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8780 NFT_MSG_NEWSET, GFP_KERNEL);
8781 nft_trans_destroy(trans);
8783 case NFT_MSG_DELSET:
8784 list_del_rcu(&nft_trans_set(trans)->list);
8785 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8786 NFT_MSG_DELSET, GFP_KERNEL);
8788 case NFT_MSG_NEWSETELEM:
8789 te = (struct nft_trans_elem *)trans->data;
8791 nft_setelem_activate(net, te->set, &te->elem);
8792 nf_tables_setelem_notify(&trans->ctx, te->set,
8794 NFT_MSG_NEWSETELEM);
8795 nft_trans_destroy(trans);
8797 case NFT_MSG_DELSETELEM:
8798 te = (struct nft_trans_elem *)trans->data;
8800 nf_tables_setelem_notify(&trans->ctx, te->set,
8802 NFT_MSG_DELSETELEM);
8803 nft_setelem_remove(net, te->set, &te->elem);
8804 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8805 atomic_dec(&te->set->nelems);
8809 case NFT_MSG_NEWOBJ:
8810 if (nft_trans_obj_update(trans)) {
8811 nft_obj_commit_update(trans);
8812 nf_tables_obj_notify(&trans->ctx,
8813 nft_trans_obj(trans),
8816 nft_clear(net, nft_trans_obj(trans));
8817 nf_tables_obj_notify(&trans->ctx,
8818 nft_trans_obj(trans),
8820 nft_trans_destroy(trans);
8823 case NFT_MSG_DELOBJ:
8824 nft_obj_del(nft_trans_obj(trans));
8825 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8828 case NFT_MSG_NEWFLOWTABLE:
8829 if (nft_trans_flowtable_update(trans)) {
8830 nft_trans_flowtable(trans)->data.flags =
8831 nft_trans_flowtable_flags(trans);
8832 nf_tables_flowtable_notify(&trans->ctx,
8833 nft_trans_flowtable(trans),
8834 &nft_trans_flowtable_hooks(trans),
8835 NFT_MSG_NEWFLOWTABLE);
8836 list_splice(&nft_trans_flowtable_hooks(trans),
8837 &nft_trans_flowtable(trans)->hook_list);
8839 nft_clear(net, nft_trans_flowtable(trans));
8840 nf_tables_flowtable_notify(&trans->ctx,
8841 nft_trans_flowtable(trans),
8842 &nft_trans_flowtable(trans)->hook_list,
8843 NFT_MSG_NEWFLOWTABLE);
8845 nft_trans_destroy(trans);
8847 case NFT_MSG_DELFLOWTABLE:
8848 if (nft_trans_flowtable_update(trans)) {
8849 nf_tables_flowtable_notify(&trans->ctx,
8850 nft_trans_flowtable(trans),
8851 &nft_trans_flowtable_hooks(trans),
8852 NFT_MSG_DELFLOWTABLE);
8853 nft_unregister_flowtable_net_hooks(net,
8854 &nft_trans_flowtable_hooks(trans));
8856 list_del_rcu(&nft_trans_flowtable(trans)->list);
8857 nf_tables_flowtable_notify(&trans->ctx,
8858 nft_trans_flowtable(trans),
8859 &nft_trans_flowtable(trans)->hook_list,
8860 NFT_MSG_DELFLOWTABLE);
8861 nft_unregister_flowtable_net_hooks(net,
8862 &nft_trans_flowtable(trans)->hook_list);
8868 nft_commit_notify(net, NETLINK_CB(skb).portid);
8869 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8870 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8871 nf_tables_commit_release(net);
8876 static void nf_tables_module_autoload(struct net *net)
8878 struct nftables_pernet *nft_net = nft_pernet(net);
8879 struct nft_module_request *req, *next;
8880 LIST_HEAD(module_list);
8882 list_splice_init(&nft_net->module_list, &module_list);
8883 mutex_unlock(&nft_net->commit_mutex);
8884 list_for_each_entry_safe(req, next, &module_list, list) {
8885 request_module("%s", req->module);
8888 mutex_lock(&nft_net->commit_mutex);
8889 list_splice(&module_list, &nft_net->module_list);
8892 static void nf_tables_abort_release(struct nft_trans *trans)
8894 switch (trans->msg_type) {
8895 case NFT_MSG_NEWTABLE:
8896 nf_tables_table_destroy(&trans->ctx);
8898 case NFT_MSG_NEWCHAIN:
8899 nf_tables_chain_destroy(&trans->ctx);
8901 case NFT_MSG_NEWRULE:
8902 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8904 case NFT_MSG_NEWSET:
8905 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8907 case NFT_MSG_NEWSETELEM:
8908 nft_set_elem_destroy(nft_trans_elem_set(trans),
8909 nft_trans_elem(trans).priv, true);
8911 case NFT_MSG_NEWOBJ:
8912 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8914 case NFT_MSG_NEWFLOWTABLE:
8915 if (nft_trans_flowtable_update(trans))
8916 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8918 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8924 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
8926 struct nftables_pernet *nft_net = nft_pernet(net);
8927 struct nft_trans *trans, *next;
8928 struct nft_trans_elem *te;
8930 if (action == NFNL_ABORT_VALIDATE &&
8931 nf_tables_validate(net) < 0)
8934 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
8936 switch (trans->msg_type) {
8937 case NFT_MSG_NEWTABLE:
8938 if (nft_trans_table_update(trans)) {
8939 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8940 nft_trans_destroy(trans);
8943 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
8944 nf_tables_table_disable(net, trans->ctx.table);
8945 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
8946 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
8947 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
8949 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8950 nft_trans_destroy(trans);
8952 list_del_rcu(&trans->ctx.table->list);
8955 case NFT_MSG_DELTABLE:
8956 nft_clear(trans->ctx.net, trans->ctx.table);
8957 nft_trans_destroy(trans);
8959 case NFT_MSG_NEWCHAIN:
8960 if (nft_trans_chain_update(trans)) {
8961 free_percpu(nft_trans_chain_stats(trans));
8962 kfree(nft_trans_chain_name(trans));
8963 nft_trans_destroy(trans);
8965 if (nft_chain_is_bound(trans->ctx.chain)) {
8966 nft_trans_destroy(trans);
8969 trans->ctx.table->use--;
8970 nft_chain_del(trans->ctx.chain);
8971 nf_tables_unregister_hook(trans->ctx.net,
8976 case NFT_MSG_DELCHAIN:
8977 trans->ctx.table->use++;
8978 nft_clear(trans->ctx.net, trans->ctx.chain);
8979 nft_trans_destroy(trans);
8981 case NFT_MSG_NEWRULE:
8982 trans->ctx.chain->use--;
8983 list_del_rcu(&nft_trans_rule(trans)->list);
8984 nft_rule_expr_deactivate(&trans->ctx,
8985 nft_trans_rule(trans),
8987 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8988 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8990 case NFT_MSG_DELRULE:
8991 trans->ctx.chain->use++;
8992 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8993 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
8994 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8995 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8997 nft_trans_destroy(trans);
8999 case NFT_MSG_NEWSET:
9000 trans->ctx.table->use--;
9001 if (nft_trans_set_bound(trans)) {
9002 nft_trans_destroy(trans);
9005 list_del_rcu(&nft_trans_set(trans)->list);
9007 case NFT_MSG_DELSET:
9008 trans->ctx.table->use++;
9009 nft_clear(trans->ctx.net, nft_trans_set(trans));
9010 nft_trans_destroy(trans);
9012 case NFT_MSG_NEWSETELEM:
9013 if (nft_trans_elem_set_bound(trans)) {
9014 nft_trans_destroy(trans);
9017 te = (struct nft_trans_elem *)trans->data;
9018 nft_setelem_remove(net, te->set, &te->elem);
9019 if (!nft_setelem_is_catchall(te->set, &te->elem))
9020 atomic_dec(&te->set->nelems);
9022 case NFT_MSG_DELSETELEM:
9023 te = (struct nft_trans_elem *)trans->data;
9025 nft_setelem_data_activate(net, te->set, &te->elem);
9026 nft_setelem_activate(net, te->set, &te->elem);
9027 if (!nft_setelem_is_catchall(te->set, &te->elem))
9030 nft_trans_destroy(trans);
9032 case NFT_MSG_NEWOBJ:
9033 if (nft_trans_obj_update(trans)) {
9034 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9035 nft_trans_destroy(trans);
9037 trans->ctx.table->use--;
9038 nft_obj_del(nft_trans_obj(trans));
9041 case NFT_MSG_DELOBJ:
9042 trans->ctx.table->use++;
9043 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9044 nft_trans_destroy(trans);
9046 case NFT_MSG_NEWFLOWTABLE:
9047 if (nft_trans_flowtable_update(trans)) {
9048 nft_unregister_flowtable_net_hooks(net,
9049 &nft_trans_flowtable_hooks(trans));
9051 trans->ctx.table->use--;
9052 list_del_rcu(&nft_trans_flowtable(trans)->list);
9053 nft_unregister_flowtable_net_hooks(net,
9054 &nft_trans_flowtable(trans)->hook_list);
9057 case NFT_MSG_DELFLOWTABLE:
9058 if (nft_trans_flowtable_update(trans)) {
9059 list_splice(&nft_trans_flowtable_hooks(trans),
9060 &nft_trans_flowtable(trans)->hook_list);
9062 trans->ctx.table->use++;
9063 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9065 nft_trans_destroy(trans);
9072 list_for_each_entry_safe_reverse(trans, next,
9073 &nft_net->commit_list, list) {
9074 list_del(&trans->list);
9075 nf_tables_abort_release(trans);
9078 if (action == NFNL_ABORT_AUTOLOAD)
9079 nf_tables_module_autoload(net);
9081 nf_tables_module_autoload_cleanup(net);
9086 static void nf_tables_cleanup(struct net *net)
9088 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9091 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9092 enum nfnl_abort_action action)
9094 struct nftables_pernet *nft_net = nft_pernet(net);
9095 int ret = __nf_tables_abort(net, action);
9097 mutex_unlock(&nft_net->commit_mutex);
9102 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9104 struct nftables_pernet *nft_net = nft_pernet(net);
9107 mutex_lock(&nft_net->commit_mutex);
9109 genid_ok = genid == 0 || nft_net->base_seq == genid;
9111 mutex_unlock(&nft_net->commit_mutex);
9113 /* else, commit mutex has to be released by commit or abort function */
9117 static const struct nfnetlink_subsystem nf_tables_subsys = {
9118 .name = "nf_tables",
9119 .subsys_id = NFNL_SUBSYS_NFTABLES,
9120 .cb_count = NFT_MSG_MAX,
9122 .commit = nf_tables_commit,
9123 .abort = nf_tables_abort,
9124 .cleanup = nf_tables_cleanup,
9125 .valid_genid = nf_tables_valid_genid,
9126 .owner = THIS_MODULE,
9129 int nft_chain_validate_dependency(const struct nft_chain *chain,
9130 enum nft_chain_types type)
9132 const struct nft_base_chain *basechain;
9134 if (nft_is_base_chain(chain)) {
9135 basechain = nft_base_chain(chain);
9136 if (basechain->type->type != type)
9141 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9143 int nft_chain_validate_hooks(const struct nft_chain *chain,
9144 unsigned int hook_flags)
9146 struct nft_base_chain *basechain;
9148 if (nft_is_base_chain(chain)) {
9149 basechain = nft_base_chain(chain);
9151 if ((1 << basechain->ops.hooknum) & hook_flags)
9159 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9162 * Loop detection - walk through the ruleset beginning at the destination chain
9163 * of a new jump until either the source chain is reached (loop) or all
9164 * reachable chains have been traversed.
9166 * The loop check is performed whenever a new jump verdict is added to an
9167 * expression or verdict map or a verdict map is bound to a new chain.
9170 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9171 const struct nft_chain *chain);
9173 static int nft_check_loops(const struct nft_ctx *ctx,
9174 const struct nft_set_ext *ext)
9176 const struct nft_data *data;
9179 data = nft_set_ext_data(ext);
9180 switch (data->verdict.code) {
9183 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9193 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9194 struct nft_set *set,
9195 const struct nft_set_iter *iter,
9196 struct nft_set_elem *elem)
9198 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9200 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9201 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9204 return nft_check_loops(ctx, ext);
9207 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9208 struct nft_set *set)
9210 u8 genmask = nft_genmask_next(ctx->net);
9211 struct nft_set_elem_catchall *catchall;
9212 struct nft_set_ext *ext;
9215 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9216 ext = nft_set_elem_ext(set, catchall->elem);
9217 if (!nft_set_elem_active(ext, genmask))
9220 ret = nft_check_loops(ctx, ext);
9228 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9229 const struct nft_chain *chain)
9231 const struct nft_rule *rule;
9232 const struct nft_expr *expr, *last;
9233 struct nft_set *set;
9234 struct nft_set_binding *binding;
9235 struct nft_set_iter iter;
9237 if (ctx->chain == chain)
9240 list_for_each_entry(rule, &chain->rules, list) {
9241 nft_rule_for_each_expr(expr, last, rule) {
9242 struct nft_immediate_expr *priv;
9243 const struct nft_data *data;
9246 if (strcmp(expr->ops->type->name, "immediate"))
9249 priv = nft_expr_priv(expr);
9250 if (priv->dreg != NFT_REG_VERDICT)
9254 switch (data->verdict.code) {
9257 err = nf_tables_check_loops(ctx,
9258 data->verdict.chain);
9268 list_for_each_entry(set, &ctx->table->sets, list) {
9269 if (!nft_is_active_next(ctx->net, set))
9271 if (!(set->flags & NFT_SET_MAP) ||
9272 set->dtype != NFT_DATA_VERDICT)
9275 list_for_each_entry(binding, &set->bindings, list) {
9276 if (!(binding->flags & NFT_SET_MAP) ||
9277 binding->chain != chain)
9280 iter.genmask = nft_genmask_next(ctx->net);
9284 iter.fn = nf_tables_loop_check_setelem;
9286 set->ops->walk(ctx, set, &iter);
9288 iter.err = nft_set_catchall_loops(ctx, set);
9299 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9301 * @attr: netlink attribute to fetch value from
9302 * @max: maximum value to be stored in dest
9303 * @dest: pointer to the variable
9305 * Parse, check and store a given u32 netlink attribute into variable.
9306 * This function returns -ERANGE if the value goes over maximum value.
9307 * Otherwise a 0 is returned and the attribute value is stored in the
9308 * destination variable.
9310 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9314 val = ntohl(nla_get_be32(attr));
9321 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9323 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9327 reg = ntohl(nla_get_be32(attr));
9329 case NFT_REG_VERDICT...NFT_REG_4:
9330 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9332 case NFT_REG32_00...NFT_REG32_15:
9333 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9343 * nft_dump_register - dump a register value to a netlink attribute
9345 * @skb: socket buffer
9346 * @attr: attribute number
9347 * @reg: register number
9349 * Construct a netlink attribute containing the register number. For
9350 * compatibility reasons, register numbers being a multiple of 4 are
9351 * translated to the corresponding 128 bit register numbers.
9353 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9355 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9356 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9358 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9360 return nla_put_be32(skb, attr, htonl(reg));
9362 EXPORT_SYMBOL_GPL(nft_dump_register);
9364 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9366 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9370 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9376 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9381 err = nft_parse_register(attr, ®);
9385 err = nft_validate_register_load(reg, len);
9392 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9394 static int nft_validate_register_store(const struct nft_ctx *ctx,
9395 enum nft_registers reg,
9396 const struct nft_data *data,
9397 enum nft_data_types type,
9403 case NFT_REG_VERDICT:
9404 if (type != NFT_DATA_VERDICT)
9408 (data->verdict.code == NFT_GOTO ||
9409 data->verdict.code == NFT_JUMP)) {
9410 err = nf_tables_check_loops(ctx, data->verdict.chain);
9417 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9421 if (reg * NFT_REG32_SIZE + len >
9422 sizeof_field(struct nft_regs, data))
9425 if (data != NULL && type != NFT_DATA_VALUE)
9431 int nft_parse_register_store(const struct nft_ctx *ctx,
9432 const struct nlattr *attr, u8 *dreg,
9433 const struct nft_data *data,
9434 enum nft_data_types type, unsigned int len)
9439 err = nft_parse_register(attr, ®);
9443 err = nft_validate_register_store(ctx, reg, data, type, len);
9450 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9452 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9453 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9454 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9455 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9456 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9459 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9460 struct nft_data_desc *desc, const struct nlattr *nla)
9462 u8 genmask = nft_genmask_next(ctx->net);
9463 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9464 struct nft_chain *chain;
9467 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9468 nft_verdict_policy, NULL);
9472 if (!tb[NFTA_VERDICT_CODE])
9474 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9476 switch (data->verdict.code) {
9478 switch (data->verdict.code & NF_VERDICT_MASK) {
9493 if (tb[NFTA_VERDICT_CHAIN]) {
9494 chain = nft_chain_lookup(ctx->net, ctx->table,
9495 tb[NFTA_VERDICT_CHAIN],
9497 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9498 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9499 tb[NFTA_VERDICT_CHAIN_ID]);
9501 return PTR_ERR(chain);
9507 return PTR_ERR(chain);
9508 if (nft_is_base_chain(chain))
9510 if (nft_chain_is_bound(chain))
9512 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9513 chain->flags & NFT_CHAIN_BINDING)
9517 data->verdict.chain = chain;
9521 desc->len = sizeof(data->verdict);
9526 static void nft_verdict_uninit(const struct nft_data *data)
9528 struct nft_chain *chain;
9529 struct nft_rule *rule;
9531 switch (data->verdict.code) {
9534 chain = data->verdict.chain;
9537 if (!nft_chain_is_bound(chain))
9540 chain->table->use--;
9541 list_for_each_entry(rule, &chain->rules, list)
9544 nft_chain_del(chain);
9549 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9551 struct nlattr *nest;
9553 nest = nla_nest_start_noflag(skb, type);
9555 goto nla_put_failure;
9557 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9558 goto nla_put_failure;
9563 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9565 goto nla_put_failure;
9567 nla_nest_end(skb, nest);
9574 static int nft_value_init(const struct nft_ctx *ctx,
9575 struct nft_data *data, struct nft_data_desc *desc,
9576 const struct nlattr *nla)
9583 if (len > desc->size)
9586 if (len != desc->len)
9592 nla_memcpy(data->data, nla, len);
9597 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9600 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9603 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9604 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9605 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9609 * nft_data_init - parse nf_tables data netlink attributes
9611 * @ctx: context of the expression using the data
9612 * @data: destination struct nft_data
9613 * @desc: data description
9614 * @nla: netlink attribute containing data
9616 * Parse the netlink data attributes and initialize a struct nft_data.
9617 * The type and length of data are returned in the data description.
9619 * The caller can indicate that it only wants to accept data of type
9620 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9622 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9623 struct nft_data_desc *desc, const struct nlattr *nla)
9625 struct nlattr *tb[NFTA_DATA_MAX + 1];
9628 if (WARN_ON_ONCE(!desc->size))
9631 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9632 nft_data_policy, NULL);
9636 if (tb[NFTA_DATA_VALUE]) {
9637 if (desc->type != NFT_DATA_VALUE)
9640 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9641 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9642 if (desc->type != NFT_DATA_VERDICT)
9645 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9652 EXPORT_SYMBOL_GPL(nft_data_init);
9655 * nft_data_release - release a nft_data item
9657 * @data: struct nft_data to release
9658 * @type: type of data
9660 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9661 * all others need to be released by calling this function.
9663 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9665 if (type < NFT_DATA_VERDICT)
9668 case NFT_DATA_VERDICT:
9669 return nft_verdict_uninit(data);
9674 EXPORT_SYMBOL_GPL(nft_data_release);
9676 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9677 enum nft_data_types type, unsigned int len)
9679 struct nlattr *nest;
9682 nest = nla_nest_start_noflag(skb, attr);
9687 case NFT_DATA_VALUE:
9688 err = nft_value_dump(skb, data, len);
9690 case NFT_DATA_VERDICT:
9691 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9698 nla_nest_end(skb, nest);
9701 EXPORT_SYMBOL_GPL(nft_data_dump);
9703 int __nft_release_basechain(struct nft_ctx *ctx)
9705 struct nft_rule *rule, *nr;
9707 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9710 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9711 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9712 list_del(&rule->list);
9714 nf_tables_rule_release(ctx, rule);
9716 nft_chain_del(ctx->chain);
9718 nf_tables_chain_destroy(ctx);
9722 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9724 static void __nft_release_hook(struct net *net, struct nft_table *table)
9726 struct nft_flowtable *flowtable;
9727 struct nft_chain *chain;
9729 list_for_each_entry(chain, &table->chains, list)
9730 __nf_tables_unregister_hook(net, table, chain, true);
9731 list_for_each_entry(flowtable, &table->flowtables, list)
9732 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9736 static void __nft_release_hooks(struct net *net)
9738 struct nftables_pernet *nft_net = nft_pernet(net);
9739 struct nft_table *table;
9741 list_for_each_entry(table, &nft_net->tables, list) {
9742 if (nft_table_has_owner(table))
9745 __nft_release_hook(net, table);
9749 static void __nft_release_table(struct net *net, struct nft_table *table)
9751 struct nft_flowtable *flowtable, *nf;
9752 struct nft_chain *chain, *nc;
9753 struct nft_object *obj, *ne;
9754 struct nft_rule *rule, *nr;
9755 struct nft_set *set, *ns;
9756 struct nft_ctx ctx = {
9758 .family = NFPROTO_NETDEV,
9761 ctx.family = table->family;
9763 list_for_each_entry(chain, &table->chains, list) {
9765 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9766 list_del(&rule->list);
9768 nf_tables_rule_release(&ctx, rule);
9771 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9772 list_del(&flowtable->list);
9774 nf_tables_flowtable_destroy(flowtable);
9776 list_for_each_entry_safe(set, ns, &table->sets, list) {
9777 list_del(&set->list);
9779 nft_set_destroy(&ctx, set);
9781 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9784 nft_obj_destroy(&ctx, obj);
9786 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9788 nft_chain_del(chain);
9790 nf_tables_chain_destroy(&ctx);
9792 nf_tables_table_destroy(&ctx);
9795 static void __nft_release_tables(struct net *net)
9797 struct nftables_pernet *nft_net = nft_pernet(net);
9798 struct nft_table *table, *nt;
9800 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9801 if (nft_table_has_owner(table))
9804 list_del(&table->list);
9806 __nft_release_table(net, table);
9810 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9813 struct nft_table *table, *to_delete[8];
9814 struct nftables_pernet *nft_net;
9815 struct netlink_notify *n = ptr;
9816 struct net *net = n->net;
9817 unsigned int deleted;
9818 bool restart = false;
9820 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9823 nft_net = nft_pernet(net);
9825 mutex_lock(&nft_net->commit_mutex);
9827 list_for_each_entry(table, &nft_net->tables, list) {
9828 if (nft_table_has_owner(table) &&
9829 n->portid == table->nlpid) {
9830 __nft_release_hook(net, table);
9831 list_del_rcu(&table->list);
9832 to_delete[deleted++] = table;
9833 if (deleted >= ARRAY_SIZE(to_delete))
9838 restart = deleted >= ARRAY_SIZE(to_delete);
9841 __nft_release_table(net, to_delete[--deleted]);
9846 mutex_unlock(&nft_net->commit_mutex);
9851 static struct notifier_block nft_nl_notifier = {
9852 .notifier_call = nft_rcv_nl_event,
9855 static int __net_init nf_tables_init_net(struct net *net)
9857 struct nftables_pernet *nft_net = nft_pernet(net);
9859 INIT_LIST_HEAD(&nft_net->tables);
9860 INIT_LIST_HEAD(&nft_net->commit_list);
9861 INIT_LIST_HEAD(&nft_net->module_list);
9862 INIT_LIST_HEAD(&nft_net->notify_list);
9863 mutex_init(&nft_net->commit_mutex);
9864 nft_net->base_seq = 1;
9865 nft_net->validate_state = NFT_VALIDATE_SKIP;
9870 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9872 struct nftables_pernet *nft_net = nft_pernet(net);
9874 mutex_lock(&nft_net->commit_mutex);
9875 __nft_release_hooks(net);
9876 mutex_unlock(&nft_net->commit_mutex);
9879 static void __net_exit nf_tables_exit_net(struct net *net)
9881 struct nftables_pernet *nft_net = nft_pernet(net);
9883 mutex_lock(&nft_net->commit_mutex);
9884 if (!list_empty(&nft_net->commit_list))
9885 __nf_tables_abort(net, NFNL_ABORT_NONE);
9886 __nft_release_tables(net);
9887 mutex_unlock(&nft_net->commit_mutex);
9888 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9889 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9890 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9893 static struct pernet_operations nf_tables_net_ops = {
9894 .init = nf_tables_init_net,
9895 .pre_exit = nf_tables_pre_exit_net,
9896 .exit = nf_tables_exit_net,
9897 .id = &nf_tables_net_id,
9898 .size = sizeof(struct nftables_pernet),
9901 static int __init nf_tables_module_init(void)
9905 err = register_pernet_subsys(&nf_tables_net_ops);
9909 err = nft_chain_filter_init();
9911 goto err_chain_filter;
9913 err = nf_tables_core_module_init();
9915 goto err_core_module;
9917 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9919 goto err_netdev_notifier;
9921 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9923 goto err_rht_objname;
9925 err = nft_offload_init();
9929 err = netlink_register_notifier(&nft_nl_notifier);
9931 goto err_netlink_notifier;
9934 err = nfnetlink_subsys_register(&nf_tables_subsys);
9936 goto err_nfnl_subsys;
9938 nft_chain_route_init();
9943 netlink_unregister_notifier(&nft_nl_notifier);
9944 err_netlink_notifier:
9947 rhltable_destroy(&nft_objname_ht);
9949 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9950 err_netdev_notifier:
9951 nf_tables_core_module_exit();
9953 nft_chain_filter_fini();
9955 unregister_pernet_subsys(&nf_tables_net_ops);
9959 static void __exit nf_tables_module_exit(void)
9961 nfnetlink_subsys_unregister(&nf_tables_subsys);
9962 netlink_unregister_notifier(&nft_nl_notifier);
9964 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
9965 nft_chain_filter_fini();
9966 nft_chain_route_fini();
9967 unregister_pernet_subsys(&nf_tables_net_ops);
9968 cancel_work_sync(&trans_destroy_work);
9970 rhltable_destroy(&nft_objname_ht);
9971 nf_tables_core_module_exit();
9974 module_init(nf_tables_module_init);
9975 module_exit(nf_tables_module_exit);
9977 MODULE_LICENSE("GPL");
9978 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
9979 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);