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-"))
27 #define NFT_SET_MAX_ANONLEN 16
29 unsigned int nf_tables_net_id __read_mostly;
31 static LIST_HEAD(nf_tables_expressions);
32 static LIST_HEAD(nf_tables_objects);
33 static LIST_HEAD(nf_tables_flowtables);
34 static LIST_HEAD(nf_tables_destroy_list);
35 static LIST_HEAD(nf_tables_gc_list);
36 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
40 NFT_VALIDATE_SKIP = 0,
45 static struct rhltable nft_objname_ht;
47 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
48 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
49 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
51 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
52 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
53 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
55 static const struct rhashtable_params nft_chain_ht_params = {
56 .head_offset = offsetof(struct nft_chain, rhlhead),
57 .key_offset = offsetof(struct nft_chain, name),
58 .hashfn = nft_chain_hash,
59 .obj_hashfn = nft_chain_hash_obj,
60 .obj_cmpfn = nft_chain_hash_cmp,
61 .automatic_shrinking = true,
64 static const struct rhashtable_params nft_objname_ht_params = {
65 .head_offset = offsetof(struct nft_object, rhlhead),
66 .key_offset = offsetof(struct nft_object, key),
67 .hashfn = nft_objname_hash,
68 .obj_hashfn = nft_objname_hash_obj,
69 .obj_cmpfn = nft_objname_hash_cmp,
70 .automatic_shrinking = true,
73 struct nft_audit_data {
74 struct nft_table *table;
77 struct list_head list;
80 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
81 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
82 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
84 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
85 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
87 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
88 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
90 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
91 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
93 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
94 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
96 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
97 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
100 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
101 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
102 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
103 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
104 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
105 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
109 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
111 switch (table->validate_state) {
112 case NFT_VALIDATE_SKIP:
113 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
115 case NFT_VALIDATE_NEED:
117 case NFT_VALIDATE_DO:
118 if (new_validate_state == NFT_VALIDATE_NEED)
122 table->validate_state = new_validate_state;
124 static void nf_tables_trans_destroy_work(struct work_struct *w);
125 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
127 static void nft_trans_gc_work(struct work_struct *work);
128 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
130 static void nft_ctx_init(struct nft_ctx *ctx,
132 const struct sk_buff *skb,
133 const struct nlmsghdr *nlh,
135 struct nft_table *table,
136 struct nft_chain *chain,
137 const struct nlattr * const *nla)
140 ctx->family = family;
145 ctx->portid = NETLINK_CB(skb).portid;
146 ctx->report = nlmsg_report(nlh);
147 ctx->flags = nlh->nlmsg_flags;
148 ctx->seq = nlh->nlmsg_seq;
151 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
152 int msg_type, u32 size, gfp_t gfp)
154 struct nft_trans *trans;
156 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
160 INIT_LIST_HEAD(&trans->list);
161 INIT_LIST_HEAD(&trans->binding_list);
162 trans->msg_type = msg_type;
168 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
169 int msg_type, u32 size)
171 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
174 static void nft_trans_list_del(struct nft_trans *trans)
176 list_del(&trans->list);
177 list_del(&trans->binding_list);
180 static void nft_trans_destroy(struct nft_trans *trans)
182 nft_trans_list_del(trans);
186 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
189 struct nftables_pernet *nft_net;
190 struct net *net = ctx->net;
191 struct nft_trans *trans;
193 if (!nft_set_is_anonymous(set))
196 nft_net = nft_pernet(net);
197 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
198 switch (trans->msg_type) {
200 if (nft_trans_set(trans) == set)
201 nft_trans_set_bound(trans) = bind;
203 case NFT_MSG_NEWSETELEM:
204 if (nft_trans_elem_set(trans) == set)
205 nft_trans_elem_set_bound(trans) = bind;
211 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
213 return __nft_set_trans_bind(ctx, set, true);
216 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
218 return __nft_set_trans_bind(ctx, set, false);
221 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
222 struct nft_chain *chain, bool bind)
224 struct nftables_pernet *nft_net;
225 struct net *net = ctx->net;
226 struct nft_trans *trans;
228 if (!nft_chain_binding(chain))
231 nft_net = nft_pernet(net);
232 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
233 switch (trans->msg_type) {
234 case NFT_MSG_NEWCHAIN:
235 if (nft_trans_chain(trans) == chain)
236 nft_trans_chain_bound(trans) = bind;
238 case NFT_MSG_NEWRULE:
239 if (trans->ctx.chain == chain)
240 nft_trans_rule_bound(trans) = bind;
246 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
247 struct nft_chain *chain)
249 __nft_chain_trans_bind(ctx, chain, true);
252 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
254 if (!nft_chain_binding(chain))
257 if (nft_chain_binding(ctx->chain))
263 if (!nft_use_inc(&chain->use))
267 nft_chain_trans_bind(ctx, chain);
272 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
274 __nft_chain_trans_bind(ctx, chain, false);
277 static int nft_netdev_register_hooks(struct net *net,
278 struct list_head *hook_list)
280 struct nft_hook *hook;
284 list_for_each_entry(hook, hook_list, list) {
285 err = nf_register_net_hook(net, &hook->ops);
294 list_for_each_entry(hook, hook_list, list) {
298 nf_unregister_net_hook(net, &hook->ops);
303 static void nft_netdev_unregister_hooks(struct net *net,
304 struct list_head *hook_list,
307 struct nft_hook *hook, *next;
309 list_for_each_entry_safe(hook, next, hook_list, list) {
310 nf_unregister_net_hook(net, &hook->ops);
311 if (release_netdev) {
312 list_del(&hook->list);
313 kfree_rcu(hook, rcu);
318 static int nf_tables_register_hook(struct net *net,
319 const struct nft_table *table,
320 struct nft_chain *chain)
322 struct nft_base_chain *basechain;
323 const struct nf_hook_ops *ops;
325 if (table->flags & NFT_TABLE_F_DORMANT ||
326 !nft_is_base_chain(chain))
329 basechain = nft_base_chain(chain);
330 ops = &basechain->ops;
332 if (basechain->type->ops_register)
333 return basechain->type->ops_register(net, ops);
335 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
336 return nft_netdev_register_hooks(net, &basechain->hook_list);
338 return nf_register_net_hook(net, &basechain->ops);
341 static void __nf_tables_unregister_hook(struct net *net,
342 const struct nft_table *table,
343 struct nft_chain *chain,
346 struct nft_base_chain *basechain;
347 const struct nf_hook_ops *ops;
349 if (table->flags & NFT_TABLE_F_DORMANT ||
350 !nft_is_base_chain(chain))
352 basechain = nft_base_chain(chain);
353 ops = &basechain->ops;
355 if (basechain->type->ops_unregister)
356 return basechain->type->ops_unregister(net, ops);
358 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
359 nft_netdev_unregister_hooks(net, &basechain->hook_list,
362 nf_unregister_net_hook(net, &basechain->ops);
365 static void nf_tables_unregister_hook(struct net *net,
366 const struct nft_table *table,
367 struct nft_chain *chain)
369 return __nf_tables_unregister_hook(net, table, chain, false);
372 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
374 struct nftables_pernet *nft_net = nft_pernet(net);
376 switch (trans->msg_type) {
378 if (!nft_trans_set_update(trans) &&
379 nft_set_is_anonymous(nft_trans_set(trans)))
380 list_add_tail(&trans->binding_list, &nft_net->binding_list);
382 case NFT_MSG_NEWCHAIN:
383 if (!nft_trans_chain_update(trans) &&
384 nft_chain_binding(nft_trans_chain(trans)))
385 list_add_tail(&trans->binding_list, &nft_net->binding_list);
389 list_add_tail(&trans->list, &nft_net->commit_list);
392 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
394 struct nft_trans *trans;
396 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
400 if (msg_type == NFT_MSG_NEWTABLE)
401 nft_activate_next(ctx->net, ctx->table);
403 nft_trans_commit_list_add_tail(ctx->net, trans);
407 static int nft_deltable(struct nft_ctx *ctx)
411 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
415 nft_deactivate_next(ctx->net, ctx->table);
419 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
421 struct nft_trans *trans;
423 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
425 return ERR_PTR(-ENOMEM);
427 if (msg_type == NFT_MSG_NEWCHAIN) {
428 nft_activate_next(ctx->net, ctx->chain);
430 if (ctx->nla[NFTA_CHAIN_ID]) {
431 nft_trans_chain_id(trans) =
432 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
435 nft_trans_chain(trans) = ctx->chain;
436 nft_trans_commit_list_add_tail(ctx->net, trans);
441 static int nft_delchain(struct nft_ctx *ctx)
443 struct nft_trans *trans;
445 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
447 return PTR_ERR(trans);
449 nft_use_dec(&ctx->table->use);
450 nft_deactivate_next(ctx->net, ctx->chain);
455 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
457 struct nft_expr *expr;
459 expr = nft_expr_first(rule);
460 while (nft_expr_more(rule, expr)) {
461 if (expr->ops->activate)
462 expr->ops->activate(ctx, expr);
464 expr = nft_expr_next(expr);
468 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
469 enum nft_trans_phase phase)
471 struct nft_expr *expr;
473 expr = nft_expr_first(rule);
474 while (nft_expr_more(rule, expr)) {
475 if (expr->ops->deactivate)
476 expr->ops->deactivate(ctx, expr, phase);
478 expr = nft_expr_next(expr);
483 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
485 /* You cannot delete the same rule twice */
486 if (nft_is_active_next(ctx->net, rule)) {
487 nft_deactivate_next(ctx->net, rule);
488 nft_use_dec(&ctx->chain->use);
494 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
495 struct nft_rule *rule)
497 struct nft_trans *trans;
499 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
503 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
504 nft_trans_rule_id(trans) =
505 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
507 nft_trans_rule(trans) = rule;
508 nft_trans_commit_list_add_tail(ctx->net, trans);
513 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
515 struct nft_flow_rule *flow;
516 struct nft_trans *trans;
519 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
523 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
524 flow = nft_flow_rule_create(ctx->net, rule);
526 nft_trans_destroy(trans);
527 return PTR_ERR(flow);
530 nft_trans_flow_rule(trans) = flow;
533 err = nf_tables_delrule_deactivate(ctx, rule);
535 nft_trans_destroy(trans);
538 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
543 static int nft_delrule_by_chain(struct nft_ctx *ctx)
545 struct nft_rule *rule;
548 list_for_each_entry(rule, &ctx->chain->rules, list) {
549 if (!nft_is_active_next(ctx->net, rule))
552 err = nft_delrule(ctx, rule);
559 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
561 const struct nft_set_desc *desc)
563 struct nft_trans *trans;
565 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
569 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
570 nft_trans_set_id(trans) =
571 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
572 nft_activate_next(ctx->net, set);
574 nft_trans_set(trans) = set;
576 nft_trans_set_update(trans) = true;
577 nft_trans_set_gc_int(trans) = desc->gc_int;
578 nft_trans_set_timeout(trans) = desc->timeout;
579 nft_trans_set_size(trans) = desc->size;
581 nft_trans_commit_list_add_tail(ctx->net, trans);
586 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
589 return __nft_trans_set_add(ctx, msg_type, set, NULL);
592 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
594 const struct nft_set_iter *iter,
595 struct nft_elem_priv *elem_priv)
597 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
602 struct nft_set_elem_catchall {
603 struct list_head list;
605 struct nft_elem_priv *elem;
608 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
611 u8 genmask = nft_genmask_next(ctx->net);
612 struct nft_set_elem_catchall *catchall;
613 struct nft_set_ext *ext;
615 list_for_each_entry(catchall, &set->catchall_list, list) {
616 ext = nft_set_elem_ext(set, catchall->elem);
617 if (!nft_set_elem_active(ext, genmask))
620 nft_setelem_data_deactivate(ctx->net, set, catchall->elem);
625 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
627 struct nft_set_iter iter = {
628 .genmask = nft_genmask_next(ctx->net),
629 .fn = nft_mapelem_deactivate,
632 set->ops->walk(ctx, set, &iter);
633 WARN_ON_ONCE(iter.err);
635 nft_map_catchall_deactivate(ctx, set);
638 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
642 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
646 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
647 nft_map_deactivate(ctx, set);
649 nft_deactivate_next(ctx->net, set);
650 nft_use_dec(&ctx->table->use);
655 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
656 struct nft_object *obj)
658 struct nft_trans *trans;
660 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
664 if (msg_type == NFT_MSG_NEWOBJ)
665 nft_activate_next(ctx->net, obj);
667 nft_trans_obj(trans) = obj;
668 nft_trans_commit_list_add_tail(ctx->net, trans);
673 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
677 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
681 nft_deactivate_next(ctx->net, obj);
682 nft_use_dec(&ctx->table->use);
687 static struct nft_trans *
688 nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
689 struct nft_flowtable *flowtable)
691 struct nft_trans *trans;
693 trans = nft_trans_alloc(ctx, msg_type,
694 sizeof(struct nft_trans_flowtable));
696 return ERR_PTR(-ENOMEM);
698 if (msg_type == NFT_MSG_NEWFLOWTABLE)
699 nft_activate_next(ctx->net, flowtable);
701 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
702 nft_trans_flowtable(trans) = flowtable;
703 nft_trans_commit_list_add_tail(ctx->net, trans);
708 static int nft_delflowtable(struct nft_ctx *ctx,
709 struct nft_flowtable *flowtable)
711 struct nft_trans *trans;
713 trans = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
715 return PTR_ERR(trans);
717 nft_deactivate_next(ctx->net, flowtable);
718 nft_use_dec(&ctx->table->use);
723 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
727 for (i = track->regs[dreg].num_reg; i > 0; i--)
728 __nft_reg_track_cancel(track, dreg - i);
731 static void __nft_reg_track_update(struct nft_regs_track *track,
732 const struct nft_expr *expr,
735 track->regs[dreg].selector = expr;
736 track->regs[dreg].bitwise = NULL;
737 track->regs[dreg].num_reg = num_reg;
740 void nft_reg_track_update(struct nft_regs_track *track,
741 const struct nft_expr *expr, u8 dreg, u8 len)
743 unsigned int regcount;
746 __nft_reg_track_clobber(track, dreg);
748 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
749 for (i = 0; i < regcount; i++, dreg++)
750 __nft_reg_track_update(track, expr, dreg, i);
752 EXPORT_SYMBOL_GPL(nft_reg_track_update);
754 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
756 unsigned int regcount;
759 __nft_reg_track_clobber(track, dreg);
761 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
762 for (i = 0; i < regcount; i++, dreg++)
763 __nft_reg_track_cancel(track, dreg);
765 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
767 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
769 track->regs[dreg].selector = NULL;
770 track->regs[dreg].bitwise = NULL;
771 track->regs[dreg].num_reg = 0;
773 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
779 static struct nft_table *nft_table_lookup(const struct net *net,
780 const struct nlattr *nla,
781 u8 family, u8 genmask, u32 nlpid)
783 struct nftables_pernet *nft_net;
784 struct nft_table *table;
787 return ERR_PTR(-EINVAL);
789 nft_net = nft_pernet(net);
790 list_for_each_entry_rcu(table, &nft_net->tables, list,
791 lockdep_is_held(&nft_net->commit_mutex)) {
792 if (!nla_strcmp(nla, table->name) &&
793 table->family == family &&
794 nft_active_genmask(table, genmask)) {
795 if (nft_table_has_owner(table) &&
796 nlpid && table->nlpid != nlpid)
797 return ERR_PTR(-EPERM);
803 return ERR_PTR(-ENOENT);
806 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
807 const struct nlattr *nla,
808 int family, u8 genmask, u32 nlpid)
810 struct nftables_pernet *nft_net;
811 struct nft_table *table;
813 nft_net = nft_pernet(net);
814 list_for_each_entry(table, &nft_net->tables, list) {
815 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
816 table->family == family &&
817 nft_active_genmask(table, genmask)) {
818 if (nft_table_has_owner(table) &&
819 nlpid && table->nlpid != nlpid)
820 return ERR_PTR(-EPERM);
826 return ERR_PTR(-ENOENT);
829 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
831 return ++table->hgenerator;
834 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
836 static const struct nft_chain_type *
837 __nft_chain_type_get(u8 family, enum nft_chain_types type)
839 if (family >= NFPROTO_NUMPROTO ||
840 type >= NFT_CHAIN_T_MAX)
843 return chain_type[family][type];
846 static const struct nft_chain_type *
847 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
849 const struct nft_chain_type *type;
852 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
853 type = __nft_chain_type_get(family, i);
856 if (!nla_strcmp(nla, type->name))
862 struct nft_module_request {
863 struct list_head list;
864 char module[MODULE_NAME_LEN];
868 #ifdef CONFIG_MODULES
869 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
872 char module_name[MODULE_NAME_LEN];
873 struct nftables_pernet *nft_net;
874 struct nft_module_request *req;
879 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
881 if (ret >= MODULE_NAME_LEN)
884 nft_net = nft_pernet(net);
885 list_for_each_entry(req, &nft_net->module_list, list) {
886 if (!strcmp(req->module, module_name)) {
890 /* A request to load this module already exists. */
895 req = kmalloc(sizeof(*req), GFP_KERNEL);
900 strscpy(req->module, module_name, MODULE_NAME_LEN);
901 list_add_tail(&req->list, &nft_net->module_list);
905 EXPORT_SYMBOL_GPL(nft_request_module);
908 static void lockdep_nfnl_nft_mutex_not_held(void)
910 #ifdef CONFIG_PROVE_LOCKING
912 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
916 static const struct nft_chain_type *
917 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
918 u8 family, bool autoload)
920 const struct nft_chain_type *type;
922 type = __nf_tables_chain_type_lookup(nla, family);
926 lockdep_nfnl_nft_mutex_not_held();
927 #ifdef CONFIG_MODULES
929 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
931 (const char *)nla_data(nla)) == -EAGAIN)
932 return ERR_PTR(-EAGAIN);
935 return ERR_PTR(-ENOENT);
938 static __be16 nft_base_seq(const struct net *net)
940 struct nftables_pernet *nft_net = nft_pernet(net);
942 return htons(nft_net->base_seq & 0xffff);
945 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
946 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
947 .len = NFT_TABLE_MAXNAMELEN - 1 },
948 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
949 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
950 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
951 .len = NFT_USERDATA_MAXLEN }
954 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
955 u32 portid, u32 seq, int event, u32 flags,
956 int family, const struct nft_table *table)
958 struct nlmsghdr *nlh;
960 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
961 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
962 NFNETLINK_V0, nft_base_seq(net));
964 goto nla_put_failure;
966 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
967 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
968 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
970 goto nla_put_failure;
972 if (event == NFT_MSG_DELTABLE) {
977 if (nla_put_be32(skb, NFTA_TABLE_FLAGS,
978 htonl(table->flags & NFT_TABLE_F_MASK)))
979 goto nla_put_failure;
981 if (nft_table_has_owner(table) &&
982 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
983 goto nla_put_failure;
986 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
987 goto nla_put_failure;
994 nlmsg_trim(skb, nlh);
998 struct nftnl_skb_parms {
1001 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
1003 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
1004 struct list_head *notify_list)
1006 NFT_CB(skb).report = report;
1007 list_add_tail(&skb->list, notify_list);
1010 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
1012 struct nftables_pernet *nft_net;
1013 struct sk_buff *skb;
1018 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1021 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1025 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1026 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1028 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
1029 event, flags, ctx->family, ctx->table);
1035 nft_net = nft_pernet(ctx->net);
1036 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1039 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1042 static int nf_tables_dump_tables(struct sk_buff *skb,
1043 struct netlink_callback *cb)
1045 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1046 struct nftables_pernet *nft_net;
1047 const struct nft_table *table;
1048 unsigned int idx = 0, s_idx = cb->args[0];
1049 struct net *net = sock_net(skb->sk);
1050 int family = nfmsg->nfgen_family;
1053 nft_net = nft_pernet(net);
1054 cb->seq = READ_ONCE(nft_net->base_seq);
1056 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1057 if (family != NFPROTO_UNSPEC && family != table->family)
1063 memset(&cb->args[1], 0,
1064 sizeof(cb->args) - sizeof(cb->args[0]));
1065 if (!nft_is_active(net, table))
1067 if (nf_tables_fill_table_info(skb, net,
1068 NETLINK_CB(cb->skb).portid,
1070 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1071 table->family, table) < 0)
1074 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1084 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1085 const struct nlmsghdr *nlh,
1086 struct netlink_dump_control *c)
1090 if (!try_module_get(THIS_MODULE))
1094 err = netlink_dump_start(nlsk, skb, nlh, c);
1096 module_put(THIS_MODULE);
1101 /* called with rcu_read_lock held */
1102 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1103 const struct nlattr * const nla[])
1105 struct netlink_ext_ack *extack = info->extack;
1106 u8 genmask = nft_genmask_cur(info->net);
1107 u8 family = info->nfmsg->nfgen_family;
1108 const struct nft_table *table;
1109 struct net *net = info->net;
1110 struct sk_buff *skb2;
1113 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1114 struct netlink_dump_control c = {
1115 .dump = nf_tables_dump_tables,
1116 .module = THIS_MODULE,
1119 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1122 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1123 if (IS_ERR(table)) {
1124 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1125 return PTR_ERR(table);
1128 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1132 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1133 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1136 goto err_fill_table_info;
1138 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1140 err_fill_table_info:
1145 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1147 struct nft_chain *chain;
1150 list_for_each_entry(chain, &table->chains, list) {
1151 if (!nft_is_active_next(net, chain))
1153 if (!nft_is_base_chain(chain))
1156 if (cnt && i++ == cnt)
1159 nf_tables_unregister_hook(net, table, chain);
1163 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1165 struct nft_chain *chain;
1168 list_for_each_entry(chain, &table->chains, list) {
1169 if (!nft_is_active_next(net, chain))
1171 if (!nft_is_base_chain(chain))
1174 err = nf_tables_register_hook(net, table, chain);
1176 goto err_register_hooks;
1184 nft_table_disable(net, table, i);
1188 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1190 table->flags &= ~NFT_TABLE_F_DORMANT;
1191 nft_table_disable(net, table, 0);
1192 table->flags |= NFT_TABLE_F_DORMANT;
1195 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1196 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1197 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1198 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1199 __NFT_TABLE_F_WAS_AWAKEN)
1201 static int nf_tables_updtable(struct nft_ctx *ctx)
1203 struct nft_trans *trans;
1207 if (!ctx->nla[NFTA_TABLE_FLAGS])
1210 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1211 if (flags & ~NFT_TABLE_F_MASK)
1214 if (flags == ctx->table->flags)
1217 if ((nft_table_has_owner(ctx->table) &&
1218 !(flags & NFT_TABLE_F_OWNER)) ||
1219 (!nft_table_has_owner(ctx->table) &&
1220 flags & NFT_TABLE_F_OWNER))
1223 /* No dormant off/on/off/on games in single transaction */
1224 if (ctx->table->flags & __NFT_TABLE_F_UPDATE)
1227 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1228 sizeof(struct nft_trans_table));
1232 if ((flags & NFT_TABLE_F_DORMANT) &&
1233 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1234 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1235 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1236 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1237 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1238 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1239 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1240 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1241 ret = nf_tables_table_enable(ctx->net, ctx->table);
1243 goto err_register_hooks;
1245 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1249 nft_trans_table_update(trans) = true;
1250 nft_trans_commit_list_add_tail(ctx->net, trans);
1255 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1256 nft_trans_destroy(trans);
1260 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1262 const char *name = data;
1264 return jhash(name, strlen(name), seed);
1267 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1269 const struct nft_chain *chain = data;
1271 return nft_chain_hash(chain->name, 0, seed);
1274 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1277 const struct nft_chain *chain = ptr;
1278 const char *name = arg->key;
1280 return strcmp(chain->name, name);
1283 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1285 const struct nft_object_hash_key *k = data;
1287 seed ^= hash_ptr(k->table, 32);
1289 return jhash(k->name, strlen(k->name), seed);
1292 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1294 const struct nft_object *obj = data;
1296 return nft_objname_hash(&obj->key, 0, seed);
1299 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1302 const struct nft_object_hash_key *k = arg->key;
1303 const struct nft_object *obj = ptr;
1305 if (obj->key.table != k->table)
1308 return strcmp(obj->key.name, k->name);
1311 static bool nft_supported_family(u8 family)
1314 #ifdef CONFIG_NF_TABLES_INET
1315 || family == NFPROTO_INET
1317 #ifdef CONFIG_NF_TABLES_IPV4
1318 || family == NFPROTO_IPV4
1320 #ifdef CONFIG_NF_TABLES_ARP
1321 || family == NFPROTO_ARP
1323 #ifdef CONFIG_NF_TABLES_NETDEV
1324 || family == NFPROTO_NETDEV
1326 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1327 || family == NFPROTO_BRIDGE
1329 #ifdef CONFIG_NF_TABLES_IPV6
1330 || family == NFPROTO_IPV6
1335 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1336 const struct nlattr * const nla[])
1338 struct nftables_pernet *nft_net = nft_pernet(info->net);
1339 struct netlink_ext_ack *extack = info->extack;
1340 u8 genmask = nft_genmask_next(info->net);
1341 u8 family = info->nfmsg->nfgen_family;
1342 struct net *net = info->net;
1343 const struct nlattr *attr;
1344 struct nft_table *table;
1349 if (!nft_supported_family(family))
1352 lockdep_assert_held(&nft_net->commit_mutex);
1353 attr = nla[NFTA_TABLE_NAME];
1354 table = nft_table_lookup(net, attr, family, genmask,
1355 NETLINK_CB(skb).portid);
1356 if (IS_ERR(table)) {
1357 if (PTR_ERR(table) != -ENOENT)
1358 return PTR_ERR(table);
1360 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1361 NL_SET_BAD_ATTR(extack, attr);
1364 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1367 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1369 return nf_tables_updtable(&ctx);
1372 if (nla[NFTA_TABLE_FLAGS]) {
1373 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1374 if (flags & ~NFT_TABLE_F_MASK)
1379 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1383 table->validate_state = nft_net->validate_state;
1384 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1385 if (table->name == NULL)
1388 if (nla[NFTA_TABLE_USERDATA]) {
1389 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1390 if (table->udata == NULL)
1391 goto err_table_udata;
1393 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1396 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1400 INIT_LIST_HEAD(&table->chains);
1401 INIT_LIST_HEAD(&table->sets);
1402 INIT_LIST_HEAD(&table->objects);
1403 INIT_LIST_HEAD(&table->flowtables);
1404 table->family = family;
1405 table->flags = flags;
1406 table->handle = ++nft_net->table_handle;
1407 if (table->flags & NFT_TABLE_F_OWNER)
1408 table->nlpid = NETLINK_CB(skb).portid;
1410 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1411 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1415 list_add_tail_rcu(&table->list, &nft_net->tables);
1418 rhltable_destroy(&table->chains_ht);
1420 kfree(table->udata);
1429 static int nft_flush_table(struct nft_ctx *ctx)
1431 struct nft_flowtable *flowtable, *nft;
1432 struct nft_chain *chain, *nc;
1433 struct nft_object *obj, *ne;
1434 struct nft_set *set, *ns;
1437 list_for_each_entry(chain, &ctx->table->chains, list) {
1438 if (!nft_is_active_next(ctx->net, chain))
1441 if (nft_chain_binding(chain))
1446 err = nft_delrule_by_chain(ctx);
1451 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1452 if (!nft_is_active_next(ctx->net, set))
1455 if (nft_set_is_anonymous(set))
1458 err = nft_delset(ctx, set);
1463 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1464 if (!nft_is_active_next(ctx->net, flowtable))
1467 err = nft_delflowtable(ctx, flowtable);
1472 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1473 if (!nft_is_active_next(ctx->net, obj))
1476 err = nft_delobj(ctx, obj);
1481 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1482 if (!nft_is_active_next(ctx->net, chain))
1485 if (nft_chain_binding(chain))
1490 err = nft_delchain(ctx);
1495 err = nft_deltable(ctx);
1500 static int nft_flush(struct nft_ctx *ctx, int family)
1502 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1503 const struct nlattr * const *nla = ctx->nla;
1504 struct nft_table *table, *nt;
1507 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1508 if (family != AF_UNSPEC && table->family != family)
1511 ctx->family = table->family;
1513 if (!nft_is_active_next(ctx->net, table))
1516 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1519 if (nla[NFTA_TABLE_NAME] &&
1520 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1525 err = nft_flush_table(ctx);
1533 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1534 const struct nlattr * const nla[])
1536 struct netlink_ext_ack *extack = info->extack;
1537 u8 genmask = nft_genmask_next(info->net);
1538 u8 family = info->nfmsg->nfgen_family;
1539 struct net *net = info->net;
1540 const struct nlattr *attr;
1541 struct nft_table *table;
1544 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1545 if (family == AF_UNSPEC ||
1546 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1547 return nft_flush(&ctx, family);
1549 if (nla[NFTA_TABLE_HANDLE]) {
1550 attr = nla[NFTA_TABLE_HANDLE];
1551 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1552 NETLINK_CB(skb).portid);
1554 attr = nla[NFTA_TABLE_NAME];
1555 table = nft_table_lookup(net, attr, family, genmask,
1556 NETLINK_CB(skb).portid);
1559 if (IS_ERR(table)) {
1560 if (PTR_ERR(table) == -ENOENT &&
1561 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1564 NL_SET_BAD_ATTR(extack, attr);
1565 return PTR_ERR(table);
1568 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1572 ctx.family = family;
1575 return nft_flush_table(&ctx);
1578 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1580 if (WARN_ON(ctx->table->use > 0))
1583 rhltable_destroy(&ctx->table->chains_ht);
1584 kfree(ctx->table->name);
1585 kfree(ctx->table->udata);
1589 void nft_register_chain_type(const struct nft_chain_type *ctype)
1591 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1592 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1593 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1596 chain_type[ctype->family][ctype->type] = ctype;
1597 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1599 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1601 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1603 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1604 chain_type[ctype->family][ctype->type] = NULL;
1605 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1607 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1613 static struct nft_chain *
1614 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1616 struct nft_chain *chain;
1618 list_for_each_entry(chain, &table->chains, list) {
1619 if (chain->handle == handle &&
1620 nft_active_genmask(chain, genmask))
1624 return ERR_PTR(-ENOENT);
1627 static bool lockdep_commit_lock_is_held(const struct net *net)
1629 #ifdef CONFIG_PROVE_LOCKING
1630 struct nftables_pernet *nft_net = nft_pernet(net);
1632 return lockdep_is_held(&nft_net->commit_mutex);
1638 static struct nft_chain *nft_chain_lookup(struct net *net,
1639 struct nft_table *table,
1640 const struct nlattr *nla, u8 genmask)
1642 char search[NFT_CHAIN_MAXNAMELEN + 1];
1643 struct rhlist_head *tmp, *list;
1644 struct nft_chain *chain;
1647 return ERR_PTR(-EINVAL);
1649 nla_strscpy(search, nla, sizeof(search));
1651 WARN_ON(!rcu_read_lock_held() &&
1652 !lockdep_commit_lock_is_held(net));
1654 chain = ERR_PTR(-ENOENT);
1656 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1660 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1661 if (nft_active_genmask(chain, genmask))
1664 chain = ERR_PTR(-ENOENT);
1670 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1671 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1672 .len = NFT_TABLE_MAXNAMELEN - 1 },
1673 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1674 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1675 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1676 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1677 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1678 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1679 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1680 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1681 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1682 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1683 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1684 .len = NFT_USERDATA_MAXLEN },
1687 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1688 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1689 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1690 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1691 .len = IFNAMSIZ - 1 },
1694 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1696 struct nft_stats *cpu_stats, total;
1697 struct nlattr *nest;
1705 memset(&total, 0, sizeof(total));
1706 for_each_possible_cpu(cpu) {
1707 cpu_stats = per_cpu_ptr(stats, cpu);
1709 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1710 pkts = cpu_stats->pkts;
1711 bytes = cpu_stats->bytes;
1712 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1714 total.bytes += bytes;
1716 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1718 goto nla_put_failure;
1720 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1721 NFTA_COUNTER_PAD) ||
1722 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1724 goto nla_put_failure;
1726 nla_nest_end(skb, nest);
1733 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1734 const struct nft_base_chain *basechain,
1735 const struct list_head *hook_list)
1737 const struct nf_hook_ops *ops = &basechain->ops;
1738 struct nft_hook *hook, *first = NULL;
1739 struct nlattr *nest, *nest_devs;
1742 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1744 goto nla_put_failure;
1745 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1746 goto nla_put_failure;
1747 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1748 goto nla_put_failure;
1750 if (nft_base_chain_netdev(family, ops->hooknum)) {
1751 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1753 goto nla_put_failure;
1756 hook_list = &basechain->hook_list;
1758 list_for_each_entry(hook, hook_list, list) {
1762 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1763 hook->ops.dev->name))
1764 goto nla_put_failure;
1767 nla_nest_end(skb, nest_devs);
1770 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1771 goto nla_put_failure;
1773 nla_nest_end(skb, nest);
1780 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1781 u32 portid, u32 seq, int event, u32 flags,
1782 int family, const struct nft_table *table,
1783 const struct nft_chain *chain,
1784 const struct list_head *hook_list)
1786 struct nlmsghdr *nlh;
1788 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1789 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1790 NFNETLINK_V0, nft_base_seq(net));
1792 goto nla_put_failure;
1794 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1795 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1796 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1798 goto nla_put_failure;
1800 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1801 nlmsg_end(skb, nlh);
1805 if (nft_is_base_chain(chain)) {
1806 const struct nft_base_chain *basechain = nft_base_chain(chain);
1807 struct nft_stats __percpu *stats;
1809 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1810 goto nla_put_failure;
1812 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1813 htonl(basechain->policy)))
1814 goto nla_put_failure;
1816 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1817 goto nla_put_failure;
1819 stats = rcu_dereference_check(basechain->stats,
1820 lockdep_commit_lock_is_held(net));
1821 if (nft_dump_stats(skb, stats))
1822 goto nla_put_failure;
1826 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1827 goto nla_put_failure;
1829 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1830 goto nla_put_failure;
1833 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1834 goto nla_put_failure;
1836 nlmsg_end(skb, nlh);
1840 nlmsg_trim(skb, nlh);
1844 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1845 const struct list_head *hook_list)
1847 struct nftables_pernet *nft_net;
1848 struct sk_buff *skb;
1853 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1856 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1860 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1861 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1863 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1864 event, flags, ctx->family, ctx->table,
1865 ctx->chain, hook_list);
1871 nft_net = nft_pernet(ctx->net);
1872 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1875 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1878 static int nf_tables_dump_chains(struct sk_buff *skb,
1879 struct netlink_callback *cb)
1881 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1882 unsigned int idx = 0, s_idx = cb->args[0];
1883 struct net *net = sock_net(skb->sk);
1884 int family = nfmsg->nfgen_family;
1885 struct nftables_pernet *nft_net;
1886 const struct nft_table *table;
1887 const struct nft_chain *chain;
1890 nft_net = nft_pernet(net);
1891 cb->seq = READ_ONCE(nft_net->base_seq);
1893 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1894 if (family != NFPROTO_UNSPEC && family != table->family)
1897 list_for_each_entry_rcu(chain, &table->chains, list) {
1901 memset(&cb->args[1], 0,
1902 sizeof(cb->args) - sizeof(cb->args[0]));
1903 if (!nft_is_active(net, chain))
1905 if (nf_tables_fill_chain_info(skb, net,
1906 NETLINK_CB(cb->skb).portid,
1910 table->family, table,
1914 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1925 /* called with rcu_read_lock held */
1926 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1927 const struct nlattr * const nla[])
1929 struct netlink_ext_ack *extack = info->extack;
1930 u8 genmask = nft_genmask_cur(info->net);
1931 u8 family = info->nfmsg->nfgen_family;
1932 const struct nft_chain *chain;
1933 struct net *net = info->net;
1934 struct nft_table *table;
1935 struct sk_buff *skb2;
1938 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1939 struct netlink_dump_control c = {
1940 .dump = nf_tables_dump_chains,
1941 .module = THIS_MODULE,
1944 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1947 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1948 if (IS_ERR(table)) {
1949 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1950 return PTR_ERR(table);
1953 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1954 if (IS_ERR(chain)) {
1955 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1956 return PTR_ERR(chain);
1959 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1963 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1964 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1965 0, family, table, chain, NULL);
1967 goto err_fill_chain_info;
1969 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1971 err_fill_chain_info:
1976 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1977 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1978 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1981 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1983 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1984 struct nft_stats __percpu *newstats;
1985 struct nft_stats *stats;
1988 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1989 nft_counter_policy, NULL);
1991 return ERR_PTR(err);
1993 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1994 return ERR_PTR(-EINVAL);
1996 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1997 if (newstats == NULL)
1998 return ERR_PTR(-ENOMEM);
2000 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2001 * are not exposed to userspace.
2004 stats = this_cpu_ptr(newstats);
2005 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2006 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2012 static void nft_chain_stats_replace(struct nft_trans *trans)
2014 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2016 if (!nft_trans_chain_stats(trans))
2019 nft_trans_chain_stats(trans) =
2020 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2021 lockdep_commit_lock_is_held(trans->ctx.net));
2023 if (!nft_trans_chain_stats(trans))
2024 static_branch_inc(&nft_counters_enabled);
2027 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2029 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2030 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2036 /* should be NULL either via abort or via successful commit */
2037 WARN_ON_ONCE(chain->blob_next);
2038 kvfree(chain->blob_next);
2041 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2043 struct nft_chain *chain = ctx->chain;
2044 struct nft_hook *hook, *next;
2046 if (WARN_ON(chain->use > 0))
2049 /* no concurrent access possible anymore */
2050 nf_tables_chain_free_chain_rules(chain);
2052 if (nft_is_base_chain(chain)) {
2053 struct nft_base_chain *basechain = nft_base_chain(chain);
2055 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2056 list_for_each_entry_safe(hook, next,
2057 &basechain->hook_list, list) {
2058 list_del_rcu(&hook->list);
2059 kfree_rcu(hook, rcu);
2062 module_put(basechain->type->owner);
2063 if (rcu_access_pointer(basechain->stats)) {
2064 static_branch_dec(&nft_counters_enabled);
2065 free_percpu(rcu_dereference_raw(basechain->stats));
2068 kfree(chain->udata);
2072 kfree(chain->udata);
2077 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2078 const struct nlattr *attr)
2080 struct net_device *dev;
2081 char ifname[IFNAMSIZ];
2082 struct nft_hook *hook;
2085 hook = kzalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2088 goto err_hook_alloc;
2091 nla_strscpy(ifname, attr, IFNAMSIZ);
2092 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2093 * indirectly serializing all the other holders of the commit_mutex with
2096 dev = __dev_get_by_name(net, ifname);
2101 hook->ops.dev = dev;
2108 return ERR_PTR(err);
2111 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2112 const struct nft_hook *this)
2114 struct nft_hook *hook;
2116 list_for_each_entry(hook, hook_list, list) {
2117 if (this->ops.dev == hook->ops.dev)
2124 static int nf_tables_parse_netdev_hooks(struct net *net,
2125 const struct nlattr *attr,
2126 struct list_head *hook_list,
2127 struct netlink_ext_ack *extack)
2129 struct nft_hook *hook, *next;
2130 const struct nlattr *tmp;
2131 int rem, n = 0, err;
2133 nla_for_each_nested(tmp, attr, rem) {
2134 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2139 hook = nft_netdev_hook_alloc(net, tmp);
2141 NL_SET_BAD_ATTR(extack, tmp);
2142 err = PTR_ERR(hook);
2145 if (nft_hook_list_find(hook_list, hook)) {
2146 NL_SET_BAD_ATTR(extack, tmp);
2151 list_add_tail(&hook->list, hook_list);
2154 if (n == NFT_NETDEVICE_MAX) {
2163 list_for_each_entry_safe(hook, next, hook_list, list) {
2164 list_del(&hook->list);
2170 struct nft_chain_hook {
2173 const struct nft_chain_type *type;
2174 struct list_head list;
2177 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2178 struct list_head *hook_list,
2179 struct netlink_ext_ack *extack, u32 flags)
2181 struct nft_hook *hook;
2184 if (tb[NFTA_HOOK_DEV]) {
2185 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2187 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2188 return PTR_ERR(hook);
2191 list_add_tail(&hook->list, hook_list);
2192 } else if (tb[NFTA_HOOK_DEVS]) {
2193 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2200 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2201 list_empty(hook_list))
2207 static int nft_chain_parse_hook(struct net *net,
2208 struct nft_base_chain *basechain,
2209 const struct nlattr * const nla[],
2210 struct nft_chain_hook *hook, u8 family,
2211 u32 flags, struct netlink_ext_ack *extack)
2213 struct nftables_pernet *nft_net = nft_pernet(net);
2214 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2215 const struct nft_chain_type *type;
2218 lockdep_assert_held(&nft_net->commit_mutex);
2219 lockdep_nfnl_nft_mutex_not_held();
2221 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2222 nla[NFTA_CHAIN_HOOK],
2223 nft_hook_policy, NULL);
2228 if (!ha[NFTA_HOOK_HOOKNUM] ||
2229 !ha[NFTA_HOOK_PRIORITY]) {
2230 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2234 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2235 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2237 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2241 if (nla[NFTA_CHAIN_TYPE]) {
2242 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2245 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2246 return PTR_ERR(type);
2249 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2252 if (type->type == NFT_CHAIN_T_NAT &&
2253 hook->priority <= NF_IP_PRI_CONNTRACK)
2256 if (ha[NFTA_HOOK_HOOKNUM]) {
2257 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2258 if (hook->num != basechain->ops.hooknum)
2261 if (ha[NFTA_HOOK_PRIORITY]) {
2262 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2263 if (hook->priority != basechain->ops.priority)
2267 if (nla[NFTA_CHAIN_TYPE]) {
2268 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2271 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2275 type = basechain->type;
2279 if (!try_module_get(type->owner)) {
2280 if (nla[NFTA_CHAIN_TYPE])
2281 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2287 INIT_LIST_HEAD(&hook->list);
2288 if (nft_base_chain_netdev(family, hook->num)) {
2289 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2291 module_put(type->owner);
2294 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2295 module_put(type->owner);
2302 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2304 struct nft_hook *h, *next;
2306 list_for_each_entry_safe(h, next, &hook->list, list) {
2310 module_put(hook->type->owner);
2313 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2315 struct nft_rule_dp_last *lrule;
2317 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2319 lrule = (struct nft_rule_dp_last *)ptr;
2320 lrule->end.is_last = 1;
2321 lrule->chain = chain;
2322 /* blob size does not include the trailer rule */
2325 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2328 struct nft_rule_blob *blob;
2333 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2335 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2340 nft_last_rule(chain, blob->data);
2345 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2346 const struct nft_chain_hook *hook,
2347 struct nft_chain *chain)
2350 ops->hooknum = hook->num;
2351 ops->priority = hook->priority;
2353 ops->hook = hook->type->hooks[ops->hooknum];
2354 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2357 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2358 struct nft_chain_hook *hook, u32 flags)
2360 struct nft_chain *chain;
2363 basechain->type = hook->type;
2364 INIT_LIST_HEAD(&basechain->hook_list);
2365 chain = &basechain->chain;
2367 if (nft_base_chain_netdev(family, hook->num)) {
2368 list_splice_init(&hook->list, &basechain->hook_list);
2369 list_for_each_entry(h, &basechain->hook_list, list)
2370 nft_basechain_hook_init(&h->ops, family, hook, chain);
2372 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2374 chain->flags |= NFT_CHAIN_BASE | flags;
2375 basechain->policy = NF_ACCEPT;
2376 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2377 !nft_chain_offload_support(basechain)) {
2378 list_splice_init(&basechain->hook_list, &hook->list);
2382 flow_block_init(&basechain->flow_block);
2387 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2391 err = rhltable_insert_key(&table->chains_ht, chain->name,
2392 &chain->rhlhead, nft_chain_ht_params);
2396 list_add_tail_rcu(&chain->list, &table->chains);
2401 static u64 chain_id;
2403 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2404 u8 policy, u32 flags,
2405 struct netlink_ext_ack *extack)
2407 const struct nlattr * const *nla = ctx->nla;
2408 struct nft_table *table = ctx->table;
2409 struct nft_base_chain *basechain;
2410 struct net *net = ctx->net;
2411 char name[NFT_NAME_MAXLEN];
2412 struct nft_rule_blob *blob;
2413 struct nft_trans *trans;
2414 struct nft_chain *chain;
2417 if (nla[NFTA_CHAIN_HOOK]) {
2418 struct nft_stats __percpu *stats = NULL;
2419 struct nft_chain_hook hook = {};
2421 if (flags & NFT_CHAIN_BINDING)
2424 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2429 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2430 if (basechain == NULL) {
2431 nft_chain_release_hook(&hook);
2434 chain = &basechain->chain;
2436 if (nla[NFTA_CHAIN_COUNTERS]) {
2437 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2438 if (IS_ERR(stats)) {
2439 nft_chain_release_hook(&hook);
2441 return PTR_ERR(stats);
2443 rcu_assign_pointer(basechain->stats, stats);
2446 err = nft_basechain_init(basechain, family, &hook, flags);
2448 nft_chain_release_hook(&hook);
2454 static_branch_inc(&nft_counters_enabled);
2456 if (flags & NFT_CHAIN_BASE)
2458 if (flags & NFT_CHAIN_HW_OFFLOAD)
2461 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2465 chain->flags = flags;
2469 INIT_LIST_HEAD(&chain->rules);
2470 chain->handle = nf_tables_alloc_handle(table);
2471 chain->table = table;
2473 if (nla[NFTA_CHAIN_NAME]) {
2474 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2476 if (!(flags & NFT_CHAIN_BINDING)) {
2478 goto err_destroy_chain;
2481 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2482 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2487 goto err_destroy_chain;
2490 if (nla[NFTA_CHAIN_USERDATA]) {
2491 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2492 if (chain->udata == NULL) {
2494 goto err_destroy_chain;
2496 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2499 blob = nf_tables_chain_alloc_rules(chain, 0);
2502 goto err_destroy_chain;
2505 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2506 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2508 if (!nft_use_inc(&table->use)) {
2510 goto err_destroy_chain;
2513 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2514 if (IS_ERR(trans)) {
2515 err = PTR_ERR(trans);
2519 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2520 if (nft_is_base_chain(chain))
2521 nft_trans_chain_policy(trans) = policy;
2523 err = nft_chain_add(table, chain);
2527 /* This must be LAST to ensure no packets are walking over this chain. */
2528 err = nf_tables_register_hook(net, table, chain);
2530 goto err_register_hook;
2535 nft_chain_del(chain);
2537 nft_trans_destroy(trans);
2539 nft_use_dec_restore(&table->use);
2541 nf_tables_chain_destroy(ctx);
2546 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2547 u32 flags, const struct nlattr *attr,
2548 struct netlink_ext_ack *extack)
2550 const struct nlattr * const *nla = ctx->nla;
2551 struct nft_base_chain *basechain = NULL;
2552 struct nft_table *table = ctx->table;
2553 struct nft_chain *chain = ctx->chain;
2554 struct nft_chain_hook hook = {};
2555 struct nft_stats *stats = NULL;
2556 struct nft_hook *h, *next;
2557 struct nf_hook_ops *ops;
2558 struct nft_trans *trans;
2559 bool unregister = false;
2562 if (chain->flags ^ flags)
2565 INIT_LIST_HEAD(&hook.list);
2567 if (nla[NFTA_CHAIN_HOOK]) {
2568 if (!nft_is_base_chain(chain)) {
2569 NL_SET_BAD_ATTR(extack, attr);
2573 basechain = nft_base_chain(chain);
2574 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2575 ctx->family, flags, extack);
2579 if (basechain->type != hook.type) {
2580 nft_chain_release_hook(&hook);
2581 NL_SET_BAD_ATTR(extack, attr);
2585 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2586 list_for_each_entry_safe(h, next, &hook.list, list) {
2587 h->ops.pf = basechain->ops.pf;
2588 h->ops.hooknum = basechain->ops.hooknum;
2589 h->ops.priority = basechain->ops.priority;
2590 h->ops.priv = basechain->ops.priv;
2591 h->ops.hook = basechain->ops.hook;
2593 if (nft_hook_list_find(&basechain->hook_list, h)) {
2599 ops = &basechain->ops;
2600 if (ops->hooknum != hook.num ||
2601 ops->priority != hook.priority) {
2602 nft_chain_release_hook(&hook);
2603 NL_SET_BAD_ATTR(extack, attr);
2609 if (nla[NFTA_CHAIN_HANDLE] &&
2610 nla[NFTA_CHAIN_NAME]) {
2611 struct nft_chain *chain2;
2613 chain2 = nft_chain_lookup(ctx->net, table,
2614 nla[NFTA_CHAIN_NAME], genmask);
2615 if (!IS_ERR(chain2)) {
2616 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2622 if (nla[NFTA_CHAIN_COUNTERS]) {
2623 if (!nft_is_base_chain(chain)) {
2628 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2629 if (IS_ERR(stats)) {
2630 err = PTR_ERR(stats);
2635 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2636 nft_is_base_chain(chain) &&
2637 !list_empty(&hook.list)) {
2638 basechain = nft_base_chain(chain);
2639 ops = &basechain->ops;
2641 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2642 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2650 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2651 sizeof(struct nft_trans_chain));
2655 nft_trans_chain_stats(trans) = stats;
2656 nft_trans_chain_update(trans) = true;
2658 if (nla[NFTA_CHAIN_POLICY])
2659 nft_trans_chain_policy(trans) = policy;
2661 nft_trans_chain_policy(trans) = -1;
2663 if (nla[NFTA_CHAIN_HANDLE] &&
2664 nla[NFTA_CHAIN_NAME]) {
2665 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2666 struct nft_trans *tmp;
2670 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2675 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2676 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2677 tmp->ctx.table == table &&
2678 nft_trans_chain_update(tmp) &&
2679 nft_trans_chain_name(tmp) &&
2680 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2681 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2687 nft_trans_chain_name(trans) = name;
2690 nft_trans_basechain(trans) = basechain;
2691 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2692 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2693 if (nla[NFTA_CHAIN_HOOK])
2694 module_put(hook.type->owner);
2696 nft_trans_commit_list_add_tail(ctx->net, trans);
2704 if (nla[NFTA_CHAIN_HOOK]) {
2705 list_for_each_entry_safe(h, next, &hook.list, list) {
2707 nf_unregister_net_hook(ctx->net, &h->ops);
2711 module_put(hook.type->owner);
2717 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2718 const struct nft_table *table,
2719 const struct nlattr *nla, u8 genmask)
2721 struct nftables_pernet *nft_net = nft_pernet(net);
2722 u32 id = ntohl(nla_get_be32(nla));
2723 struct nft_trans *trans;
2725 list_for_each_entry(trans, &nft_net->commit_list, list) {
2726 struct nft_chain *chain = trans->ctx.chain;
2728 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2729 chain->table == table &&
2730 id == nft_trans_chain_id(trans) &&
2731 nft_active_genmask(chain, genmask))
2734 return ERR_PTR(-ENOENT);
2737 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2738 const struct nlattr * const nla[])
2740 struct nftables_pernet *nft_net = nft_pernet(info->net);
2741 struct netlink_ext_ack *extack = info->extack;
2742 u8 genmask = nft_genmask_next(info->net);
2743 u8 family = info->nfmsg->nfgen_family;
2744 struct nft_chain *chain = NULL;
2745 struct net *net = info->net;
2746 const struct nlattr *attr;
2747 struct nft_table *table;
2748 u8 policy = NF_ACCEPT;
2753 lockdep_assert_held(&nft_net->commit_mutex);
2755 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2756 NETLINK_CB(skb).portid);
2757 if (IS_ERR(table)) {
2758 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2759 return PTR_ERR(table);
2763 attr = nla[NFTA_CHAIN_NAME];
2765 if (nla[NFTA_CHAIN_HANDLE]) {
2766 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2767 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2768 if (IS_ERR(chain)) {
2769 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2770 return PTR_ERR(chain);
2772 attr = nla[NFTA_CHAIN_HANDLE];
2773 } else if (nla[NFTA_CHAIN_NAME]) {
2774 chain = nft_chain_lookup(net, table, attr, genmask);
2775 if (IS_ERR(chain)) {
2776 if (PTR_ERR(chain) != -ENOENT) {
2777 NL_SET_BAD_ATTR(extack, attr);
2778 return PTR_ERR(chain);
2782 } else if (!nla[NFTA_CHAIN_ID]) {
2786 if (nla[NFTA_CHAIN_POLICY]) {
2787 if (chain != NULL &&
2788 !nft_is_base_chain(chain)) {
2789 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2793 if (chain == NULL &&
2794 nla[NFTA_CHAIN_HOOK] == NULL) {
2795 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2799 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2809 if (nla[NFTA_CHAIN_FLAGS])
2810 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2812 flags = chain->flags;
2814 if (flags & ~NFT_CHAIN_FLAGS)
2817 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2819 if (chain != NULL) {
2820 if (chain->flags & NFT_CHAIN_BINDING)
2823 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2824 NL_SET_BAD_ATTR(extack, attr);
2827 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2830 flags |= chain->flags & NFT_CHAIN_BASE;
2831 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2835 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2838 static int nft_delchain_hook(struct nft_ctx *ctx,
2839 struct nft_base_chain *basechain,
2840 struct netlink_ext_ack *extack)
2842 const struct nft_chain *chain = &basechain->chain;
2843 const struct nlattr * const *nla = ctx->nla;
2844 struct nft_chain_hook chain_hook = {};
2845 struct nft_hook *this, *hook;
2846 LIST_HEAD(chain_del_list);
2847 struct nft_trans *trans;
2850 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2851 ctx->family, chain->flags, extack);
2855 list_for_each_entry(this, &chain_hook.list, list) {
2856 hook = nft_hook_list_find(&basechain->hook_list, this);
2859 goto err_chain_del_hook;
2861 list_move(&hook->list, &chain_del_list);
2864 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2865 sizeof(struct nft_trans_chain));
2868 goto err_chain_del_hook;
2871 nft_trans_basechain(trans) = basechain;
2872 nft_trans_chain_update(trans) = true;
2873 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2874 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2875 nft_chain_release_hook(&chain_hook);
2877 nft_trans_commit_list_add_tail(ctx->net, trans);
2882 list_splice(&chain_del_list, &basechain->hook_list);
2883 nft_chain_release_hook(&chain_hook);
2888 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2889 const struct nlattr * const nla[])
2891 struct netlink_ext_ack *extack = info->extack;
2892 u8 genmask = nft_genmask_next(info->net);
2893 u8 family = info->nfmsg->nfgen_family;
2894 struct net *net = info->net;
2895 const struct nlattr *attr;
2896 struct nft_table *table;
2897 struct nft_chain *chain;
2898 struct nft_rule *rule;
2904 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2905 NETLINK_CB(skb).portid);
2906 if (IS_ERR(table)) {
2907 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2908 return PTR_ERR(table);
2911 if (nla[NFTA_CHAIN_HANDLE]) {
2912 attr = nla[NFTA_CHAIN_HANDLE];
2913 handle = be64_to_cpu(nla_get_be64(attr));
2914 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2916 attr = nla[NFTA_CHAIN_NAME];
2917 chain = nft_chain_lookup(net, table, attr, genmask);
2919 if (IS_ERR(chain)) {
2920 if (PTR_ERR(chain) == -ENOENT &&
2921 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2924 NL_SET_BAD_ATTR(extack, attr);
2925 return PTR_ERR(chain);
2928 if (nft_chain_binding(chain))
2931 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2933 if (nla[NFTA_CHAIN_HOOK]) {
2934 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2937 if (nft_is_base_chain(chain)) {
2938 struct nft_base_chain *basechain = nft_base_chain(chain);
2940 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2941 return nft_delchain_hook(&ctx, basechain, extack);
2945 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2950 list_for_each_entry(rule, &chain->rules, list) {
2951 if (!nft_is_active_next(net, rule))
2955 err = nft_delrule(&ctx, rule);
2960 /* There are rules and elements that are still holding references to us,
2961 * we cannot do a recursive removal in this case.
2964 NL_SET_BAD_ATTR(extack, attr);
2968 return nft_delchain(&ctx);
2976 * nft_register_expr - register nf_tables expr type
2979 * Registers the expr type for use with nf_tables. Returns zero on
2980 * success or a negative errno code otherwise.
2982 int nft_register_expr(struct nft_expr_type *type)
2984 if (WARN_ON_ONCE(type->maxattr > NFT_EXPR_MAXATTR))
2987 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2988 if (type->family == NFPROTO_UNSPEC)
2989 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2991 list_add_rcu(&type->list, &nf_tables_expressions);
2992 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2995 EXPORT_SYMBOL_GPL(nft_register_expr);
2998 * nft_unregister_expr - unregister nf_tables expr type
3001 * Unregisters the expr typefor use with nf_tables.
3003 void nft_unregister_expr(struct nft_expr_type *type)
3005 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3006 list_del_rcu(&type->list);
3007 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3009 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3011 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3014 const struct nft_expr_type *type, *candidate = NULL;
3016 list_for_each_entry(type, &nf_tables_expressions, list) {
3017 if (!nla_strcmp(nla, type->name)) {
3018 if (!type->family && !candidate)
3020 else if (type->family == family)
3027 #ifdef CONFIG_MODULES
3028 static int nft_expr_type_request_module(struct net *net, u8 family,
3031 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3032 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3039 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3043 const struct nft_expr_type *type;
3046 return ERR_PTR(-EINVAL);
3048 type = __nft_expr_type_get(family, nla);
3049 if (type != NULL && try_module_get(type->owner))
3052 lockdep_nfnl_nft_mutex_not_held();
3053 #ifdef CONFIG_MODULES
3055 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3056 return ERR_PTR(-EAGAIN);
3058 if (nft_request_module(net, "nft-expr-%.*s",
3060 (char *)nla_data(nla)) == -EAGAIN)
3061 return ERR_PTR(-EAGAIN);
3064 return ERR_PTR(-ENOENT);
3067 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3068 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3069 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3070 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3073 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3074 const struct nft_expr *expr, bool reset)
3076 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3077 goto nla_put_failure;
3079 if (expr->ops->dump) {
3080 struct nlattr *data = nla_nest_start_noflag(skb,
3083 goto nla_put_failure;
3084 if (expr->ops->dump(skb, expr, reset) < 0)
3085 goto nla_put_failure;
3086 nla_nest_end(skb, data);
3095 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3096 const struct nft_expr *expr, bool reset)
3098 struct nlattr *nest;
3100 nest = nla_nest_start_noflag(skb, attr);
3102 goto nla_put_failure;
3103 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3104 goto nla_put_failure;
3105 nla_nest_end(skb, nest);
3112 struct nft_expr_info {
3113 const struct nft_expr_ops *ops;
3114 const struct nlattr *attr;
3115 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3118 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3119 const struct nlattr *nla,
3120 struct nft_expr_info *info)
3122 const struct nft_expr_type *type;
3123 const struct nft_expr_ops *ops;
3124 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3127 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3128 nft_expr_policy, NULL);
3132 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3134 return PTR_ERR(type);
3136 if (tb[NFTA_EXPR_DATA]) {
3137 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3139 type->policy, NULL);
3143 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3145 if (type->select_ops != NULL) {
3146 ops = type->select_ops(ctx,
3147 (const struct nlattr * const *)info->tb);
3150 #ifdef CONFIG_MODULES
3152 if (nft_expr_type_request_module(ctx->net,
3154 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3168 module_put(type->owner);
3172 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3173 struct nft_expr_info *info)
3175 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3176 const struct nft_expr_type *type;
3179 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3180 nft_expr_policy, NULL);
3184 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3187 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3191 if (!type->inner_ops)
3194 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3196 type->policy, NULL);
3201 info->ops = type->inner_ops;
3209 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3210 const struct nft_expr_info *expr_info,
3211 struct nft_expr *expr)
3213 const struct nft_expr_ops *ops = expr_info->ops;
3218 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3229 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3230 struct nft_expr *expr)
3232 const struct nft_expr_type *type = expr->ops->type;
3234 if (expr->ops->destroy)
3235 expr->ops->destroy(ctx, expr);
3236 module_put(type->owner);
3239 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3240 const struct nlattr *nla)
3242 struct nft_expr_info expr_info;
3243 struct nft_expr *expr;
3244 struct module *owner;
3247 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3249 goto err_expr_parse;
3252 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3253 goto err_expr_stateful;
3256 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3258 goto err_expr_stateful;
3260 err = nf_tables_newexpr(ctx, &expr_info, expr);
3268 owner = expr_info.ops->type->owner;
3269 if (expr_info.ops->type->release_ops)
3270 expr_info.ops->type->release_ops(expr_info.ops);
3274 return ERR_PTR(err);
3277 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3281 if (WARN_ON_ONCE(!src->ops->clone))
3284 dst->ops = src->ops;
3285 err = src->ops->clone(dst, src);
3289 __module_get(src->ops->type->owner);
3294 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3296 nf_tables_expr_destroy(ctx, expr);
3304 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3307 struct nft_rule *rule;
3309 // FIXME: this sucks
3310 list_for_each_entry_rcu(rule, &chain->rules, list) {
3311 if (handle == rule->handle)
3315 return ERR_PTR(-ENOENT);
3318 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3319 const struct nlattr *nla)
3322 return ERR_PTR(-EINVAL);
3324 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3327 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3328 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3329 .len = NFT_TABLE_MAXNAMELEN - 1 },
3330 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3331 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3332 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3333 [NFTA_RULE_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
3334 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3335 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3336 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3337 .len = NFT_USERDATA_MAXLEN },
3338 [NFTA_RULE_ID] = { .type = NLA_U32 },
3339 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3340 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3343 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3344 u32 portid, u32 seq, int event,
3345 u32 flags, int family,
3346 const struct nft_table *table,
3347 const struct nft_chain *chain,
3348 const struct nft_rule *rule, u64 handle,
3351 struct nlmsghdr *nlh;
3352 const struct nft_expr *expr, *next;
3353 struct nlattr *list;
3354 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3356 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3359 goto nla_put_failure;
3361 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3362 goto nla_put_failure;
3363 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3364 goto nla_put_failure;
3365 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3367 goto nla_put_failure;
3369 if (event != NFT_MSG_DELRULE && handle) {
3370 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3372 goto nla_put_failure;
3375 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3376 nft_flow_rule_stats(chain, rule);
3378 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3380 goto nla_put_failure;
3381 nft_rule_for_each_expr(expr, next, rule) {
3382 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3383 goto nla_put_failure;
3385 nla_nest_end(skb, list);
3388 struct nft_userdata *udata = nft_userdata(rule);
3389 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3391 goto nla_put_failure;
3394 nlmsg_end(skb, nlh);
3398 nlmsg_trim(skb, nlh);
3402 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3403 const struct nft_rule *rule, int event)
3405 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3406 const struct nft_rule *prule;
3407 struct sk_buff *skb;
3413 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3416 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3420 if (event == NFT_MSG_NEWRULE &&
3421 !list_is_first(&rule->list, &ctx->chain->rules) &&
3422 !list_is_last(&rule->list, &ctx->chain->rules)) {
3423 prule = list_prev_entry(rule, list);
3424 handle = prule->handle;
3426 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3427 flags |= NLM_F_APPEND;
3428 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3429 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3431 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3432 event, flags, ctx->family, ctx->table,
3433 ctx->chain, rule, handle, false);
3439 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3442 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3445 static void audit_log_rule_reset(const struct nft_table *table,
3446 unsigned int base_seq,
3447 unsigned int nentries)
3449 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3450 table->name, base_seq);
3452 audit_log_nfcfg(buf, table->family, nentries,
3453 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3457 struct nft_rule_dump_ctx {
3464 static int __nf_tables_dump_rules(struct sk_buff *skb,
3466 struct netlink_callback *cb,
3467 const struct nft_table *table,
3468 const struct nft_chain *chain)
3470 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3471 struct net *net = sock_net(skb->sk);
3472 const struct nft_rule *rule, *prule;
3473 unsigned int entries = 0;
3478 list_for_each_entry_rcu(rule, &chain->rules, list) {
3479 if (!nft_is_active(net, rule))
3481 if (*idx < ctx->s_idx)
3484 handle = prule->handle;
3488 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3491 NLM_F_MULTI | NLM_F_APPEND,
3493 table, chain, rule, handle, ctx->reset) < 0) {
3498 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3505 if (ctx->reset && entries)
3506 audit_log_rule_reset(table, cb->seq, entries);
3511 static int nf_tables_dump_rules(struct sk_buff *skb,
3512 struct netlink_callback *cb)
3514 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3515 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3516 struct nft_table *table;
3517 const struct nft_chain *chain;
3518 unsigned int idx = 0;
3519 struct net *net = sock_net(skb->sk);
3520 int family = nfmsg->nfgen_family;
3521 struct nftables_pernet *nft_net;
3524 nft_net = nft_pernet(net);
3525 cb->seq = READ_ONCE(nft_net->base_seq);
3527 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3528 if (family != NFPROTO_UNSPEC && family != table->family)
3531 if (ctx->table && strcmp(ctx->table, table->name) != 0)
3534 if (ctx->table && ctx->chain) {
3535 struct rhlist_head *list, *tmp;
3537 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3538 nft_chain_ht_params);
3542 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3543 if (!nft_is_active(net, chain))
3545 __nf_tables_dump_rules(skb, &idx,
3552 list_for_each_entry_rcu(chain, &table->chains, list) {
3553 if (__nf_tables_dump_rules(skb, &idx,
3568 static int nf_tables_dumpreset_rules(struct sk_buff *skb,
3569 struct netlink_callback *cb)
3571 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
3574 /* Mutex is held is to prevent that two concurrent dump-and-reset calls
3575 * do not underrun counters and quotas. The commit_mutex is used for
3576 * the lack a better lock, this is not transaction path.
3578 mutex_lock(&nft_net->commit_mutex);
3579 ret = nf_tables_dump_rules(skb, cb);
3580 mutex_unlock(&nft_net->commit_mutex);
3585 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3587 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3588 const struct nlattr * const *nla = cb->data;
3590 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
3592 if (nla[NFTA_RULE_TABLE]) {
3593 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE], GFP_ATOMIC);
3597 if (nla[NFTA_RULE_CHAIN]) {
3598 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN], GFP_ATOMIC);
3607 static int nf_tables_dumpreset_rules_start(struct netlink_callback *cb)
3609 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3613 return nf_tables_dump_rules_start(cb);
3616 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3618 struct nft_rule_dump_ctx *ctx = (void *)cb->ctx;
3625 /* called with rcu_read_lock held */
3626 static struct sk_buff *
3627 nf_tables_getrule_single(u32 portid, const struct nfnl_info *info,
3628 const struct nlattr * const nla[], bool reset)
3630 struct netlink_ext_ack *extack = info->extack;
3631 u8 genmask = nft_genmask_cur(info->net);
3632 u8 family = info->nfmsg->nfgen_family;
3633 const struct nft_chain *chain;
3634 const struct nft_rule *rule;
3635 struct net *net = info->net;
3636 struct nft_table *table;
3637 struct sk_buff *skb2;
3640 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3641 if (IS_ERR(table)) {
3642 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3643 return ERR_CAST(table);
3646 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3647 if (IS_ERR(chain)) {
3648 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3649 return ERR_CAST(chain);
3652 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3654 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3655 return ERR_CAST(rule);
3658 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3660 return ERR_PTR(-ENOMEM);
3662 err = nf_tables_fill_rule_info(skb2, net, portid,
3663 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3664 family, table, chain, rule, 0, reset);
3667 return ERR_PTR(err);
3673 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3674 const struct nlattr * const nla[])
3676 u32 portid = NETLINK_CB(skb).portid;
3677 struct net *net = info->net;
3678 struct sk_buff *skb2;
3680 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3681 struct netlink_dump_control c = {
3682 .start= nf_tables_dump_rules_start,
3683 .dump = nf_tables_dump_rules,
3684 .done = nf_tables_dump_rules_done,
3685 .module = THIS_MODULE,
3686 .data = (void *)nla,
3689 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3692 skb2 = nf_tables_getrule_single(portid, info, nla, false);
3694 return PTR_ERR(skb2);
3696 return nfnetlink_unicast(skb2, net, portid);
3699 static int nf_tables_getrule_reset(struct sk_buff *skb,
3700 const struct nfnl_info *info,
3701 const struct nlattr * const nla[])
3703 struct nftables_pernet *nft_net = nft_pernet(info->net);
3704 u32 portid = NETLINK_CB(skb).portid;
3705 struct net *net = info->net;
3706 struct sk_buff *skb2;
3709 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3710 struct netlink_dump_control c = {
3711 .start= nf_tables_dumpreset_rules_start,
3712 .dump = nf_tables_dumpreset_rules,
3713 .done = nf_tables_dump_rules_done,
3714 .module = THIS_MODULE,
3715 .data = (void *)nla,
3718 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3721 if (!try_module_get(THIS_MODULE))
3724 mutex_lock(&nft_net->commit_mutex);
3725 skb2 = nf_tables_getrule_single(portid, info, nla, true);
3726 mutex_unlock(&nft_net->commit_mutex);
3728 module_put(THIS_MODULE);
3731 return PTR_ERR(skb2);
3733 buf = kasprintf(GFP_ATOMIC, "%.*s:%u",
3734 nla_len(nla[NFTA_RULE_TABLE]),
3735 (char *)nla_data(nla[NFTA_RULE_TABLE]),
3737 audit_log_nfcfg(buf, info->nfmsg->nfgen_family, 1,
3738 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3741 return nfnetlink_unicast(skb2, net, portid);
3744 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3746 struct nft_expr *expr, *next;
3749 * Careful: some expressions might not be initialized in case this
3750 * is called on error from nf_tables_newrule().
3752 expr = nft_expr_first(rule);
3753 while (nft_expr_more(rule, expr)) {
3754 next = nft_expr_next(expr);
3755 nf_tables_expr_destroy(ctx, expr);
3761 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3763 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3764 nf_tables_rule_destroy(ctx, rule);
3767 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3769 struct nft_expr *expr, *last;
3770 const struct nft_data *data;
3771 struct nft_rule *rule;
3774 if (ctx->level == NFT_JUMP_STACK_SIZE)
3777 list_for_each_entry(rule, &chain->rules, list) {
3778 if (fatal_signal_pending(current))
3781 if (!nft_is_active_next(ctx->net, rule))
3784 nft_rule_for_each_expr(expr, last, rule) {
3785 if (!expr->ops->validate)
3788 err = expr->ops->validate(ctx, expr, &data);
3796 EXPORT_SYMBOL_GPL(nft_chain_validate);
3798 static int nft_table_validate(struct net *net, const struct nft_table *table)
3800 struct nft_chain *chain;
3801 struct nft_ctx ctx = {
3803 .family = table->family,
3807 list_for_each_entry(chain, &table->chains, list) {
3808 if (!nft_is_base_chain(chain))
3812 err = nft_chain_validate(&ctx, chain);
3822 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3823 const struct nft_set_iter *iter,
3824 struct nft_elem_priv *elem_priv)
3826 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
3827 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3828 const struct nft_data *data;
3831 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3832 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3835 data = nft_set_ext_data(ext);
3836 switch (data->verdict.code) {
3840 err = nft_chain_validate(ctx, data->verdict.chain);
3852 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3854 u8 genmask = nft_genmask_next(ctx->net);
3855 struct nft_set_elem_catchall *catchall;
3856 struct nft_set_ext *ext;
3859 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3860 ext = nft_set_elem_ext(set, catchall->elem);
3861 if (!nft_set_elem_active(ext, genmask))
3864 ret = nft_setelem_validate(ctx, set, NULL, catchall->elem);
3872 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3873 const struct nft_chain *chain,
3874 const struct nlattr *nla);
3876 #define NFT_RULE_MAXEXPRS 128
3878 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3879 const struct nlattr * const nla[])
3881 struct nftables_pernet *nft_net = nft_pernet(info->net);
3882 struct netlink_ext_ack *extack = info->extack;
3883 unsigned int size, i, n, ulen = 0, usize = 0;
3884 u8 genmask = nft_genmask_next(info->net);
3885 struct nft_rule *rule, *old_rule = NULL;
3886 struct nft_expr_info *expr_info = NULL;
3887 u8 family = info->nfmsg->nfgen_family;
3888 struct nft_flow_rule *flow = NULL;
3889 struct net *net = info->net;
3890 struct nft_userdata *udata;
3891 struct nft_table *table;
3892 struct nft_chain *chain;
3893 struct nft_trans *trans;
3894 u64 handle, pos_handle;
3895 struct nft_expr *expr;
3900 lockdep_assert_held(&nft_net->commit_mutex);
3902 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3903 NETLINK_CB(skb).portid);
3904 if (IS_ERR(table)) {
3905 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3906 return PTR_ERR(table);
3909 if (nla[NFTA_RULE_CHAIN]) {
3910 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3912 if (IS_ERR(chain)) {
3913 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3914 return PTR_ERR(chain);
3917 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3918 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3920 if (IS_ERR(chain)) {
3921 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3922 return PTR_ERR(chain);
3928 if (nft_chain_is_bound(chain))
3931 if (nla[NFTA_RULE_HANDLE]) {
3932 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3933 rule = __nft_rule_lookup(chain, handle);
3935 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3936 return PTR_ERR(rule);
3939 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3940 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3943 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3948 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3949 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3951 handle = nf_tables_alloc_handle(table);
3953 if (nla[NFTA_RULE_POSITION]) {
3954 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3955 old_rule = __nft_rule_lookup(chain, pos_handle);
3956 if (IS_ERR(old_rule)) {
3957 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3958 return PTR_ERR(old_rule);
3960 } else if (nla[NFTA_RULE_POSITION_ID]) {
3961 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3962 if (IS_ERR(old_rule)) {
3963 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3964 return PTR_ERR(old_rule);
3969 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3973 if (nla[NFTA_RULE_EXPRESSIONS]) {
3974 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3975 sizeof(struct nft_expr_info),
3980 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3982 if (nla_type(tmp) != NFTA_LIST_ELEM)
3983 goto err_release_expr;
3984 if (n == NFT_RULE_MAXEXPRS)
3985 goto err_release_expr;
3986 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3988 NL_SET_BAD_ATTR(extack, tmp);
3989 goto err_release_expr;
3991 size += expr_info[n].ops->size;
3995 /* Check for overflow of dlen field */
3997 if (size >= 1 << 12)
3998 goto err_release_expr;
4000 if (nla[NFTA_RULE_USERDATA]) {
4001 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
4003 usize = sizeof(struct nft_userdata) + ulen;
4007 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
4009 goto err_release_expr;
4011 nft_activate_next(net, rule);
4013 rule->handle = handle;
4015 rule->udata = ulen ? 1 : 0;
4018 udata = nft_userdata(rule);
4019 udata->len = ulen - 1;
4020 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
4023 expr = nft_expr_first(rule);
4024 for (i = 0; i < n; i++) {
4025 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
4027 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
4028 goto err_release_rule;
4031 if (expr_info[i].ops->validate)
4032 nft_validate_state_update(table, NFT_VALIDATE_NEED);
4034 expr_info[i].ops = NULL;
4035 expr = nft_expr_next(expr);
4038 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
4039 flow = nft_flow_rule_create(net, rule);
4041 err = PTR_ERR(flow);
4042 goto err_release_rule;
4046 if (!nft_use_inc(&chain->use)) {
4048 goto err_release_rule;
4051 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
4052 if (nft_chain_binding(chain)) {
4054 goto err_destroy_flow_rule;
4057 err = nft_delrule(&ctx, old_rule);
4059 goto err_destroy_flow_rule;
4061 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4062 if (trans == NULL) {
4064 goto err_destroy_flow_rule;
4066 list_add_tail_rcu(&rule->list, &old_rule->list);
4068 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4071 goto err_destroy_flow_rule;
4074 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4076 list_add_rcu(&rule->list, &old_rule->list);
4078 list_add_tail_rcu(&rule->list, &chain->rules);
4081 list_add_tail_rcu(&rule->list, &old_rule->list);
4083 list_add_rcu(&rule->list, &chain->rules);
4089 nft_trans_flow_rule(trans) = flow;
4091 if (table->validate_state == NFT_VALIDATE_DO)
4092 return nft_table_validate(net, table);
4096 err_destroy_flow_rule:
4097 nft_use_dec_restore(&chain->use);
4099 nft_flow_rule_destroy(flow);
4101 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4102 nf_tables_rule_destroy(&ctx, rule);
4104 for (i = 0; i < n; i++) {
4105 if (expr_info[i].ops) {
4106 module_put(expr_info[i].ops->type->owner);
4107 if (expr_info[i].ops->type->release_ops)
4108 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4116 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4117 const struct nft_chain *chain,
4118 const struct nlattr *nla)
4120 struct nftables_pernet *nft_net = nft_pernet(net);
4121 u32 id = ntohl(nla_get_be32(nla));
4122 struct nft_trans *trans;
4124 list_for_each_entry(trans, &nft_net->commit_list, list) {
4125 if (trans->msg_type == NFT_MSG_NEWRULE &&
4126 trans->ctx.chain == chain &&
4127 id == nft_trans_rule_id(trans))
4128 return nft_trans_rule(trans);
4130 return ERR_PTR(-ENOENT);
4133 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4134 const struct nlattr * const nla[])
4136 struct netlink_ext_ack *extack = info->extack;
4137 u8 genmask = nft_genmask_next(info->net);
4138 u8 family = info->nfmsg->nfgen_family;
4139 struct nft_chain *chain = NULL;
4140 struct net *net = info->net;
4141 struct nft_table *table;
4142 struct nft_rule *rule;
4146 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4147 NETLINK_CB(skb).portid);
4148 if (IS_ERR(table)) {
4149 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4150 return PTR_ERR(table);
4153 if (nla[NFTA_RULE_CHAIN]) {
4154 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4156 if (IS_ERR(chain)) {
4157 if (PTR_ERR(chain) == -ENOENT &&
4158 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4161 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4162 return PTR_ERR(chain);
4164 if (nft_chain_binding(chain))
4168 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4171 if (nla[NFTA_RULE_HANDLE]) {
4172 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4174 if (PTR_ERR(rule) == -ENOENT &&
4175 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4178 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4179 return PTR_ERR(rule);
4182 err = nft_delrule(&ctx, rule);
4183 } else if (nla[NFTA_RULE_ID]) {
4184 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4186 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4187 return PTR_ERR(rule);
4190 err = nft_delrule(&ctx, rule);
4192 err = nft_delrule_by_chain(&ctx);
4195 list_for_each_entry(chain, &table->chains, list) {
4196 if (!nft_is_active_next(net, chain))
4198 if (nft_chain_binding(chain))
4202 err = nft_delrule_by_chain(&ctx);
4214 static const struct nft_set_type *nft_set_types[] = {
4215 &nft_set_hash_fast_type,
4217 &nft_set_rhash_type,
4218 &nft_set_bitmap_type,
4219 &nft_set_rbtree_type,
4220 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4221 &nft_set_pipapo_avx2_type,
4223 &nft_set_pipapo_type,
4226 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4227 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4230 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4232 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4236 * Select a set implementation based on the data characteristics and the
4237 * given policy. The total memory use might not be known if no size is
4238 * given, in that case the amount of memory per element is used.
4240 static const struct nft_set_ops *
4241 nft_select_set_ops(const struct nft_ctx *ctx,
4242 const struct nlattr * const nla[],
4243 const struct nft_set_desc *desc)
4245 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4246 const struct nft_set_ops *ops, *bops;
4247 struct nft_set_estimate est, best;
4248 const struct nft_set_type *type;
4252 lockdep_assert_held(&nft_net->commit_mutex);
4253 lockdep_nfnl_nft_mutex_not_held();
4255 if (nla[NFTA_SET_FLAGS] != NULL)
4256 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4263 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4264 type = nft_set_types[i];
4267 if (!nft_set_ops_candidate(type, flags))
4269 if (!ops->estimate(desc, flags, &est))
4272 switch (desc->policy) {
4273 case NFT_SET_POL_PERFORMANCE:
4274 if (est.lookup < best.lookup)
4276 if (est.lookup == best.lookup &&
4277 est.space < best.space)
4280 case NFT_SET_POL_MEMORY:
4282 if (est.space < best.space)
4284 if (est.space == best.space &&
4285 est.lookup < best.lookup)
4287 } else if (est.size < best.size || !bops) {
4302 return ERR_PTR(-EOPNOTSUPP);
4305 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4306 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4307 .len = NFT_TABLE_MAXNAMELEN - 1 },
4308 [NFTA_SET_NAME] = { .type = NLA_STRING,
4309 .len = NFT_SET_MAXNAMELEN - 1 },
4310 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4311 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4312 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4313 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4314 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4315 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4316 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4317 [NFTA_SET_ID] = { .type = NLA_U32 },
4318 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4319 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4320 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4321 .len = NFT_USERDATA_MAXLEN },
4322 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4323 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4324 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4325 [NFTA_SET_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
4328 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4329 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4332 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4333 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4334 [NFTA_SET_DESC_CONCAT] = NLA_POLICY_NESTED_ARRAY(nft_concat_policy),
4337 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4338 const struct nlattr *nla, u8 genmask)
4340 struct nft_set *set;
4343 return ERR_PTR(-EINVAL);
4345 list_for_each_entry_rcu(set, &table->sets, list) {
4346 if (!nla_strcmp(nla, set->name) &&
4347 nft_active_genmask(set, genmask))
4350 return ERR_PTR(-ENOENT);
4353 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4354 const struct nlattr *nla,
4357 struct nft_set *set;
4359 list_for_each_entry(set, &table->sets, list) {
4360 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4361 nft_active_genmask(set, genmask))
4364 return ERR_PTR(-ENOENT);
4367 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4368 const struct nft_table *table,
4369 const struct nlattr *nla, u8 genmask)
4371 struct nftables_pernet *nft_net = nft_pernet(net);
4372 u32 id = ntohl(nla_get_be32(nla));
4373 struct nft_trans *trans;
4375 list_for_each_entry(trans, &nft_net->commit_list, list) {
4376 if (trans->msg_type == NFT_MSG_NEWSET) {
4377 struct nft_set *set = nft_trans_set(trans);
4379 if (id == nft_trans_set_id(trans) &&
4380 set->table == table &&
4381 nft_active_genmask(set, genmask))
4385 return ERR_PTR(-ENOENT);
4388 struct nft_set *nft_set_lookup_global(const struct net *net,
4389 const struct nft_table *table,
4390 const struct nlattr *nla_set_name,
4391 const struct nlattr *nla_set_id,
4394 struct nft_set *set;
4396 set = nft_set_lookup(table, nla_set_name, genmask);
4401 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4405 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4407 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4410 const struct nft_set *i;
4412 unsigned long *inuse;
4413 unsigned int n = 0, min = 0;
4415 p = strchr(name, '%');
4417 if (p[1] != 'd' || strchr(p + 2, '%'))
4420 if (strnlen(name, NFT_SET_MAX_ANONLEN) >= NFT_SET_MAX_ANONLEN)
4423 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4427 list_for_each_entry(i, &ctx->table->sets, list) {
4430 if (!nft_is_active_next(ctx->net, i))
4432 if (!sscanf(i->name, name, &tmp))
4434 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4437 set_bit(tmp - min, inuse);
4440 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4441 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4442 min += BITS_PER_BYTE * PAGE_SIZE;
4443 memset(inuse, 0, PAGE_SIZE);
4446 free_page((unsigned long)inuse);
4449 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4453 list_for_each_entry(i, &ctx->table->sets, list) {
4454 if (!nft_is_active_next(ctx->net, i))
4456 if (!strcmp(set->name, i->name)) {
4465 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4467 u64 ms = be64_to_cpu(nla_get_be64(nla));
4468 u64 max = (u64)(~((u64)0));
4470 max = div_u64(max, NSEC_PER_MSEC);
4474 ms *= NSEC_PER_MSEC;
4475 *result = nsecs_to_jiffies64(ms);
4479 __be64 nf_jiffies64_to_msecs(u64 input)
4481 return cpu_to_be64(jiffies64_to_msecs(input));
4484 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4485 const struct nft_set *set)
4487 struct nlattr *concat, *field;
4490 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4494 for (i = 0; i < set->field_count; i++) {
4495 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4499 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4500 htonl(set->field_len[i])))
4503 nla_nest_end(skb, field);
4506 nla_nest_end(skb, concat);
4511 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4512 const struct nft_set *set, u16 event, u16 flags)
4514 u64 timeout = READ_ONCE(set->timeout);
4515 u32 gc_int = READ_ONCE(set->gc_int);
4516 u32 portid = ctx->portid;
4517 struct nlmsghdr *nlh;
4518 struct nlattr *nest;
4522 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4523 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4524 NFNETLINK_V0, nft_base_seq(ctx->net));
4526 goto nla_put_failure;
4528 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4529 goto nla_put_failure;
4530 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4531 goto nla_put_failure;
4532 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4534 goto nla_put_failure;
4536 if (event == NFT_MSG_DELSET) {
4537 nlmsg_end(skb, nlh);
4541 if (set->flags != 0)
4542 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4543 goto nla_put_failure;
4545 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4546 goto nla_put_failure;
4547 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4548 goto nla_put_failure;
4549 if (set->flags & NFT_SET_MAP) {
4550 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4551 goto nla_put_failure;
4552 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4553 goto nla_put_failure;
4555 if (set->flags & NFT_SET_OBJECT &&
4556 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4557 goto nla_put_failure;
4560 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4561 nf_jiffies64_to_msecs(timeout),
4563 goto nla_put_failure;
4565 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4566 goto nla_put_failure;
4568 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4569 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4570 goto nla_put_failure;
4574 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4575 goto nla_put_failure;
4577 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4579 goto nla_put_failure;
4581 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4582 goto nla_put_failure;
4584 if (set->field_count > 1 &&
4585 nf_tables_fill_set_concat(skb, set))
4586 goto nla_put_failure;
4588 nla_nest_end(skb, nest);
4590 if (set->num_exprs == 1) {
4591 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4592 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4593 goto nla_put_failure;
4595 nla_nest_end(skb, nest);
4596 } else if (set->num_exprs > 1) {
4597 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4599 goto nla_put_failure;
4601 for (i = 0; i < set->num_exprs; i++) {
4602 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4603 set->exprs[i], false) < 0)
4604 goto nla_put_failure;
4606 nla_nest_end(skb, nest);
4609 nlmsg_end(skb, nlh);
4613 nlmsg_trim(skb, nlh);
4617 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4618 const struct nft_set *set, int event,
4621 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4622 u32 portid = ctx->portid;
4623 struct sk_buff *skb;
4628 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4631 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4635 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4636 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4638 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4644 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4647 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4650 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4652 const struct nft_set *set;
4653 unsigned int idx, s_idx = cb->args[0];
4654 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4655 struct net *net = sock_net(skb->sk);
4656 struct nft_ctx *ctx = cb->data, ctx_set;
4657 struct nftables_pernet *nft_net;
4663 nft_net = nft_pernet(net);
4664 cb->seq = READ_ONCE(nft_net->base_seq);
4666 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4667 if (ctx->family != NFPROTO_UNSPEC &&
4668 ctx->family != table->family)
4671 if (ctx->table && ctx->table != table)
4675 if (cur_table != table)
4681 list_for_each_entry_rcu(set, &table->sets, list) {
4684 if (!nft_is_active(net, set))
4688 ctx_set.table = table;
4689 ctx_set.family = table->family;
4691 if (nf_tables_fill_set(skb, &ctx_set, set,
4695 cb->args[2] = (unsigned long) table;
4698 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4711 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4713 struct nft_ctx *ctx_dump = NULL;
4715 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4716 if (ctx_dump == NULL)
4719 cb->data = ctx_dump;
4723 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4729 /* called with rcu_read_lock held */
4730 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4731 const struct nlattr * const nla[])
4733 struct netlink_ext_ack *extack = info->extack;
4734 u8 genmask = nft_genmask_cur(info->net);
4735 u8 family = info->nfmsg->nfgen_family;
4736 struct nft_table *table = NULL;
4737 struct net *net = info->net;
4738 const struct nft_set *set;
4739 struct sk_buff *skb2;
4743 if (nla[NFTA_SET_TABLE]) {
4744 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4746 if (IS_ERR(table)) {
4747 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4748 return PTR_ERR(table);
4752 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4754 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4755 struct netlink_dump_control c = {
4756 .start = nf_tables_dump_sets_start,
4757 .dump = nf_tables_dump_sets,
4758 .done = nf_tables_dump_sets_done,
4760 .module = THIS_MODULE,
4763 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4766 /* Only accept unspec with dump */
4767 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4768 return -EAFNOSUPPORT;
4769 if (!nla[NFTA_SET_TABLE])
4772 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4774 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4775 return PTR_ERR(set);
4778 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4782 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4784 goto err_fill_set_info;
4786 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4793 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4794 struct nft_set_desc *desc)
4796 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4800 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4803 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4804 nft_concat_policy, NULL);
4808 if (!tb[NFTA_SET_FIELD_LEN])
4811 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4812 if (!len || len > U8_MAX)
4815 desc->field_len[desc->field_count++] = len;
4820 static int nft_set_desc_concat(struct nft_set_desc *desc,
4821 const struct nlattr *nla)
4823 u32 num_regs = 0, key_num_regs = 0;
4824 struct nlattr *attr;
4827 nla_for_each_nested(attr, nla, rem) {
4828 if (nla_type(attr) != NFTA_LIST_ELEM)
4831 err = nft_set_desc_concat_parse(attr, desc);
4836 for (i = 0; i < desc->field_count; i++)
4837 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4839 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4840 if (key_num_regs != num_regs)
4843 if (num_regs > NFT_REG32_COUNT)
4849 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4850 const struct nlattr *nla)
4852 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4855 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4856 nft_set_desc_policy, NULL);
4860 if (da[NFTA_SET_DESC_SIZE] != NULL)
4861 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4862 if (da[NFTA_SET_DESC_CONCAT])
4863 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4868 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4869 const struct nlattr * const *nla,
4870 struct nft_expr **exprs, int *num_exprs,
4873 struct nft_expr *expr;
4876 if (nla[NFTA_SET_EXPR]) {
4877 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4879 err = PTR_ERR(expr);
4880 goto err_set_expr_alloc;
4884 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4888 if (!(flags & NFT_SET_EXPR)) {
4890 goto err_set_expr_alloc;
4893 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4894 if (i == NFT_SET_EXPR_MAX) {
4896 goto err_set_expr_alloc;
4898 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4900 goto err_set_expr_alloc;
4902 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4904 err = PTR_ERR(expr);
4905 goto err_set_expr_alloc;
4915 for (i = 0; i < *num_exprs; i++)
4916 nft_expr_destroy(ctx, exprs[i]);
4921 static bool nft_set_is_same(const struct nft_set *set,
4922 const struct nft_set_desc *desc,
4923 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4927 if (set->ktype != desc->ktype ||
4928 set->dtype != desc->dtype ||
4929 set->flags != flags ||
4930 set->klen != desc->klen ||
4931 set->dlen != desc->dlen ||
4932 set->field_count != desc->field_count ||
4933 set->num_exprs != num_exprs)
4936 for (i = 0; i < desc->field_count; i++) {
4937 if (set->field_len[i] != desc->field_len[i])
4941 for (i = 0; i < num_exprs; i++) {
4942 if (set->exprs[i]->ops != exprs[i]->ops)
4949 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4950 const struct nlattr * const nla[])
4952 struct netlink_ext_ack *extack = info->extack;
4953 u8 genmask = nft_genmask_next(info->net);
4954 u8 family = info->nfmsg->nfgen_family;
4955 const struct nft_set_ops *ops;
4956 struct net *net = info->net;
4957 struct nft_set_desc desc;
4958 struct nft_table *table;
4959 unsigned char *udata;
4960 struct nft_set *set;
4970 if (nla[NFTA_SET_TABLE] == NULL ||
4971 nla[NFTA_SET_NAME] == NULL ||
4972 nla[NFTA_SET_KEY_LEN] == NULL ||
4973 nla[NFTA_SET_ID] == NULL)
4976 memset(&desc, 0, sizeof(desc));
4978 desc.ktype = NFT_DATA_VALUE;
4979 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4980 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4981 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4985 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4986 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4990 if (nla[NFTA_SET_FLAGS] != NULL) {
4991 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4992 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4993 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4994 NFT_SET_MAP | NFT_SET_EVAL |
4995 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4997 /* Only one of these operations is supported */
4998 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4999 (NFT_SET_MAP | NFT_SET_OBJECT))
5001 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
5002 (NFT_SET_EVAL | NFT_SET_OBJECT))
5004 if ((flags & (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT | NFT_SET_EVAL)) ==
5005 (NFT_SET_ANONYMOUS | NFT_SET_TIMEOUT))
5007 if ((flags & (NFT_SET_CONSTANT | NFT_SET_TIMEOUT)) ==
5008 (NFT_SET_CONSTANT | NFT_SET_TIMEOUT))
5013 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
5014 if (!(flags & NFT_SET_MAP))
5017 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
5018 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
5019 desc.dtype != NFT_DATA_VERDICT)
5022 if (desc.dtype != NFT_DATA_VERDICT) {
5023 if (nla[NFTA_SET_DATA_LEN] == NULL)
5025 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
5026 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
5029 desc.dlen = sizeof(struct nft_verdict);
5030 } else if (flags & NFT_SET_MAP)
5033 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
5034 if (!(flags & NFT_SET_OBJECT))
5037 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
5038 if (desc.objtype == NFT_OBJECT_UNSPEC ||
5039 desc.objtype > NFT_OBJECT_MAX)
5041 } else if (flags & NFT_SET_OBJECT)
5044 desc.objtype = NFT_OBJECT_UNSPEC;
5047 if (nla[NFTA_SET_TIMEOUT] != NULL) {
5048 if (!(flags & NFT_SET_TIMEOUT))
5051 if (flags & NFT_SET_ANONYMOUS)
5054 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
5059 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
5060 if (!(flags & NFT_SET_TIMEOUT))
5063 if (flags & NFT_SET_ANONYMOUS)
5066 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
5069 desc.policy = NFT_SET_POL_PERFORMANCE;
5070 if (nla[NFTA_SET_POLICY] != NULL) {
5071 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
5072 switch (desc.policy) {
5073 case NFT_SET_POL_PERFORMANCE:
5074 case NFT_SET_POL_MEMORY:
5081 if (nla[NFTA_SET_DESC] != NULL) {
5082 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5086 if (desc.field_count > 1) {
5087 if (!(flags & NFT_SET_CONCAT))
5089 } else if (flags & NFT_SET_CONCAT) {
5092 } else if (flags & NFT_SET_CONCAT) {
5096 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5099 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5100 NETLINK_CB(skb).portid);
5101 if (IS_ERR(table)) {
5102 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5103 return PTR_ERR(table);
5106 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5108 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5110 if (PTR_ERR(set) != -ENOENT) {
5111 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5112 return PTR_ERR(set);
5115 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5117 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5118 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5121 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5124 if (nft_set_is_anonymous(set))
5127 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5132 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5133 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5137 for (i = 0; i < num_exprs; i++)
5138 nft_expr_destroy(&ctx, exprs[i]);
5143 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5146 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5149 ops = nft_select_set_ops(&ctx, nla, &desc);
5151 return PTR_ERR(ops);
5154 if (nla[NFTA_SET_USERDATA])
5155 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5158 if (ops->privsize != NULL)
5159 size = ops->privsize(nla, &desc);
5160 alloc_size = sizeof(*set) + size + udlen;
5161 if (alloc_size < size || alloc_size > INT_MAX)
5164 if (!nft_use_inc(&table->use))
5167 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5173 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5179 err = nf_tables_set_alloc_name(&ctx, set, name);
5186 udata = set->data + size;
5187 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5190 INIT_LIST_HEAD(&set->bindings);
5191 INIT_LIST_HEAD(&set->catchall_list);
5192 refcount_set(&set->refs, 1);
5194 write_pnet(&set->net, net);
5196 set->ktype = desc.ktype;
5197 set->klen = desc.klen;
5198 set->dtype = desc.dtype;
5199 set->objtype = desc.objtype;
5200 set->dlen = desc.dlen;
5202 set->size = desc.size;
5203 set->policy = desc.policy;
5206 set->timeout = desc.timeout;
5207 set->gc_int = desc.gc_int;
5209 set->field_count = desc.field_count;
5210 for (i = 0; i < desc.field_count; i++)
5211 set->field_len[i] = desc.field_len[i];
5213 err = ops->init(set, &desc, nla);
5217 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5219 goto err_set_destroy;
5221 set->num_exprs = num_exprs;
5222 set->handle = nf_tables_alloc_handle(table);
5223 INIT_LIST_HEAD(&set->pending_update);
5225 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5227 goto err_set_expr_alloc;
5229 list_add_tail_rcu(&set->list, &table->sets);
5234 for (i = 0; i < set->num_exprs; i++)
5235 nft_expr_destroy(&ctx, set->exprs[i]);
5237 ops->destroy(&ctx, set);
5243 nft_use_dec_restore(&table->use);
5248 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5249 struct nft_set *set)
5251 struct nft_set_elem_catchall *next, *catchall;
5253 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5254 list_del_rcu(&catchall->list);
5255 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5256 kfree_rcu(catchall, rcu);
5260 static void nft_set_put(struct nft_set *set)
5262 if (refcount_dec_and_test(&set->refs)) {
5268 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5272 if (WARN_ON(set->use > 0))
5275 for (i = 0; i < set->num_exprs; i++)
5276 nft_expr_destroy(ctx, set->exprs[i]);
5278 set->ops->destroy(ctx, set);
5279 nft_set_catchall_destroy(ctx, set);
5283 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5284 const struct nlattr * const nla[])
5286 struct netlink_ext_ack *extack = info->extack;
5287 u8 genmask = nft_genmask_next(info->net);
5288 u8 family = info->nfmsg->nfgen_family;
5289 struct net *net = info->net;
5290 const struct nlattr *attr;
5291 struct nft_table *table;
5292 struct nft_set *set;
5295 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5296 return -EAFNOSUPPORT;
5298 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5299 genmask, NETLINK_CB(skb).portid);
5300 if (IS_ERR(table)) {
5301 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5302 return PTR_ERR(table);
5305 if (nla[NFTA_SET_HANDLE]) {
5306 attr = nla[NFTA_SET_HANDLE];
5307 set = nft_set_lookup_byhandle(table, attr, genmask);
5309 attr = nla[NFTA_SET_NAME];
5310 set = nft_set_lookup(table, attr, genmask);
5314 if (PTR_ERR(set) == -ENOENT &&
5315 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5318 NL_SET_BAD_ATTR(extack, attr);
5319 return PTR_ERR(set);
5322 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5323 atomic_read(&set->nelems) > 0)) {
5324 NL_SET_BAD_ATTR(extack, attr);
5328 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5330 return nft_delset(&ctx, set);
5333 static int nft_validate_register_store(const struct nft_ctx *ctx,
5334 enum nft_registers reg,
5335 const struct nft_data *data,
5336 enum nft_data_types type,
5339 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5340 struct nft_set *set,
5341 struct nft_elem_priv *elem_priv)
5343 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5344 enum nft_registers dreg;
5346 dreg = nft_type_to_reg(set->dtype);
5347 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5348 set->dtype == NFT_DATA_VERDICT ?
5349 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5353 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5354 struct nft_set *set,
5355 const struct nft_set_iter *iter,
5356 struct nft_elem_priv *elem_priv)
5358 return nft_setelem_data_validate(ctx, set, elem_priv);
5361 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5362 struct nft_set *set)
5364 u8 genmask = nft_genmask_next(ctx->net);
5365 struct nft_set_elem_catchall *catchall;
5366 struct nft_set_ext *ext;
5369 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5370 ext = nft_set_elem_ext(set, catchall->elem);
5371 if (!nft_set_elem_active(ext, genmask))
5374 ret = nft_setelem_data_validate(ctx, set, catchall->elem);
5382 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5383 struct nft_set_binding *binding)
5385 struct nft_set_binding *i;
5386 struct nft_set_iter iter;
5388 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5391 if (binding->flags & NFT_SET_MAP) {
5392 /* If the set is already bound to the same chain all
5393 * jumps are already validated for that chain.
5395 list_for_each_entry(i, &set->bindings, list) {
5396 if (i->flags & NFT_SET_MAP &&
5397 i->chain == binding->chain)
5401 iter.genmask = nft_genmask_next(ctx->net);
5405 iter.fn = nf_tables_bind_check_setelem;
5407 set->ops->walk(ctx, set, &iter);
5409 iter.err = nft_set_catchall_bind_check(ctx, set);
5415 if (!nft_use_inc(&set->use))
5418 binding->chain = ctx->chain;
5419 list_add_tail_rcu(&binding->list, &set->bindings);
5420 nft_set_trans_bind(ctx, set);
5424 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5426 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5427 struct nft_set_binding *binding, bool event)
5429 list_del_rcu(&binding->list);
5431 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5432 list_del_rcu(&set->list);
5435 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5440 static void nft_setelem_data_activate(const struct net *net,
5441 const struct nft_set *set,
5442 struct nft_elem_priv *elem_priv);
5444 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5445 struct nft_set *set,
5446 const struct nft_set_iter *iter,
5447 struct nft_elem_priv *elem_priv)
5449 nft_setelem_data_activate(ctx->net, set, elem_priv);
5454 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5455 struct nft_set *set)
5457 u8 genmask = nft_genmask_next(ctx->net);
5458 struct nft_set_elem_catchall *catchall;
5459 struct nft_set_ext *ext;
5461 list_for_each_entry(catchall, &set->catchall_list, list) {
5462 ext = nft_set_elem_ext(set, catchall->elem);
5463 if (!nft_set_elem_active(ext, genmask))
5466 nft_setelem_data_activate(ctx->net, set, catchall->elem);
5471 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5473 struct nft_set_iter iter = {
5474 .genmask = nft_genmask_next(ctx->net),
5475 .fn = nft_mapelem_activate,
5478 set->ops->walk(ctx, set, &iter);
5479 WARN_ON_ONCE(iter.err);
5481 nft_map_catchall_activate(ctx, set);
5484 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5486 if (nft_set_is_anonymous(set)) {
5487 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5488 nft_map_activate(ctx, set);
5490 nft_clear(ctx->net, set);
5493 nft_use_inc_restore(&set->use);
5495 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5497 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5498 struct nft_set_binding *binding,
5499 enum nft_trans_phase phase)
5502 case NFT_TRANS_PREPARE_ERROR:
5503 nft_set_trans_unbind(ctx, set);
5504 if (nft_set_is_anonymous(set))
5505 nft_deactivate_next(ctx->net, set);
5507 list_del_rcu(&binding->list);
5509 nft_use_dec(&set->use);
5511 case NFT_TRANS_PREPARE:
5512 if (nft_set_is_anonymous(set)) {
5513 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5514 nft_map_deactivate(ctx, set);
5516 nft_deactivate_next(ctx->net, set);
5518 nft_use_dec(&set->use);
5520 case NFT_TRANS_ABORT:
5521 case NFT_TRANS_RELEASE:
5522 if (nft_set_is_anonymous(set) &&
5523 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5524 nft_map_deactivate(ctx, set);
5526 nft_use_dec(&set->use);
5529 nf_tables_unbind_set(ctx, set, binding,
5530 phase == NFT_TRANS_COMMIT);
5533 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5535 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5537 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5538 nft_set_destroy(ctx, set);
5540 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5542 const struct nft_set_ext_type nft_set_ext_types[] = {
5543 [NFT_SET_EXT_KEY] = {
5544 .align = __alignof__(u32),
5546 [NFT_SET_EXT_DATA] = {
5547 .align = __alignof__(u32),
5549 [NFT_SET_EXT_EXPRESSIONS] = {
5550 .align = __alignof__(struct nft_set_elem_expr),
5552 [NFT_SET_EXT_OBJREF] = {
5553 .len = sizeof(struct nft_object *),
5554 .align = __alignof__(struct nft_object *),
5556 [NFT_SET_EXT_FLAGS] = {
5558 .align = __alignof__(u8),
5560 [NFT_SET_EXT_TIMEOUT] = {
5562 .align = __alignof__(u64),
5564 [NFT_SET_EXT_EXPIRATION] = {
5566 .align = __alignof__(u64),
5568 [NFT_SET_EXT_USERDATA] = {
5569 .len = sizeof(struct nft_userdata),
5570 .align = __alignof__(struct nft_userdata),
5572 [NFT_SET_EXT_KEY_END] = {
5573 .align = __alignof__(u32),
5581 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5582 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5583 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5584 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5585 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5586 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5587 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5588 .len = NFT_USERDATA_MAXLEN },
5589 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5590 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5591 .len = NFT_OBJ_MAXNAMELEN - 1 },
5592 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5593 [NFTA_SET_ELEM_EXPRESSIONS] = NLA_POLICY_NESTED_ARRAY(nft_expr_policy),
5596 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5597 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5598 .len = NFT_TABLE_MAXNAMELEN - 1 },
5599 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5600 .len = NFT_SET_MAXNAMELEN - 1 },
5601 [NFTA_SET_ELEM_LIST_ELEMENTS] = NLA_POLICY_NESTED_ARRAY(nft_set_elem_policy),
5602 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5605 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5606 const struct nft_set *set,
5607 const struct nft_set_ext *ext,
5610 struct nft_set_elem_expr *elem_expr;
5611 u32 size, num_exprs = 0;
5612 struct nft_expr *expr;
5613 struct nlattr *nest;
5615 elem_expr = nft_set_ext_expr(ext);
5616 nft_setelem_expr_foreach(expr, elem_expr, size)
5619 if (num_exprs == 1) {
5620 expr = nft_setelem_expr_at(elem_expr, 0);
5621 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5625 } else if (num_exprs > 1) {
5626 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5628 goto nla_put_failure;
5630 nft_setelem_expr_foreach(expr, elem_expr, size) {
5631 expr = nft_setelem_expr_at(elem_expr, size);
5632 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5633 goto nla_put_failure;
5635 nla_nest_end(skb, nest);
5643 static int nf_tables_fill_setelem(struct sk_buff *skb,
5644 const struct nft_set *set,
5645 const struct nft_elem_priv *elem_priv,
5648 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5649 unsigned char *b = skb_tail_pointer(skb);
5650 struct nlattr *nest;
5652 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5654 goto nla_put_failure;
5656 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5657 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5658 NFT_DATA_VALUE, set->klen) < 0)
5659 goto nla_put_failure;
5661 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5662 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5663 NFT_DATA_VALUE, set->klen) < 0)
5664 goto nla_put_failure;
5666 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5667 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5668 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5670 goto nla_put_failure;
5672 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5673 nft_set_elem_expr_dump(skb, set, ext, reset))
5674 goto nla_put_failure;
5676 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5677 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5678 (*nft_set_ext_obj(ext))->key.name) < 0)
5679 goto nla_put_failure;
5681 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5682 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5683 htonl(*nft_set_ext_flags(ext))))
5684 goto nla_put_failure;
5686 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5687 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5688 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5690 goto nla_put_failure;
5692 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5693 u64 expires, now = get_jiffies_64();
5695 expires = *nft_set_ext_expiration(ext);
5696 if (time_before64(now, expires))
5701 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5702 nf_jiffies64_to_msecs(expires),
5704 goto nla_put_failure;
5707 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5708 struct nft_userdata *udata;
5710 udata = nft_set_ext_userdata(ext);
5711 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5712 udata->len + 1, udata->data))
5713 goto nla_put_failure;
5716 nla_nest_end(skb, nest);
5724 struct nft_set_dump_args {
5725 const struct netlink_callback *cb;
5726 struct nft_set_iter iter;
5727 struct sk_buff *skb;
5731 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5732 struct nft_set *set,
5733 const struct nft_set_iter *iter,
5734 struct nft_elem_priv *elem_priv)
5736 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
5737 struct nft_set_dump_args *args;
5739 if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
5742 args = container_of(iter, struct nft_set_dump_args, iter);
5743 return nf_tables_fill_setelem(args->skb, set, elem_priv, args->reset);
5746 static void audit_log_nft_set_reset(const struct nft_table *table,
5747 unsigned int base_seq,
5748 unsigned int nentries)
5750 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5752 audit_log_nfcfg(buf, table->family, nentries,
5753 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5757 struct nft_set_dump_ctx {
5758 const struct nft_set *set;
5763 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5764 const struct nft_set *set, bool reset,
5765 unsigned int base_seq)
5767 struct nft_set_elem_catchall *catchall;
5768 u8 genmask = nft_genmask_cur(net);
5769 struct nft_set_ext *ext;
5772 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5773 ext = nft_set_elem_ext(set, catchall->elem);
5774 if (!nft_set_elem_active(ext, genmask) ||
5775 nft_set_elem_expired(ext))
5778 ret = nf_tables_fill_setelem(skb, set, catchall->elem, reset);
5780 audit_log_nft_set_reset(set->table, base_seq, 1);
5787 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5789 struct nft_set_dump_ctx *dump_ctx = cb->data;
5790 struct net *net = sock_net(skb->sk);
5791 struct nftables_pernet *nft_net;
5792 struct nft_table *table;
5793 struct nft_set *set;
5794 struct nft_set_dump_args args;
5795 bool set_found = false;
5796 struct nlmsghdr *nlh;
5797 struct nlattr *nest;
5802 nft_net = nft_pernet(net);
5803 cb->seq = READ_ONCE(nft_net->base_seq);
5805 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5806 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5807 dump_ctx->ctx.family != table->family)
5810 if (table != dump_ctx->ctx.table)
5813 list_for_each_entry_rcu(set, &table->sets, list) {
5814 if (set == dump_ctx->set) {
5827 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5828 portid = NETLINK_CB(cb->skb).portid;
5829 seq = cb->nlh->nlmsg_seq;
5831 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5832 table->family, NFNETLINK_V0, nft_base_seq(net));
5834 goto nla_put_failure;
5836 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5837 goto nla_put_failure;
5838 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5839 goto nla_put_failure;
5841 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5843 goto nla_put_failure;
5847 args.reset = dump_ctx->reset;
5848 args.iter.genmask = nft_genmask_cur(net);
5849 args.iter.skip = cb->args[0];
5850 args.iter.count = 0;
5852 args.iter.fn = nf_tables_dump_setelem;
5853 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5855 if (!args.iter.err && args.iter.count == cb->args[0])
5856 args.iter.err = nft_set_catchall_dump(net, skb, set,
5857 dump_ctx->reset, cb->seq);
5858 nla_nest_end(skb, nest);
5859 nlmsg_end(skb, nlh);
5863 if (args.iter.err && args.iter.err != -EMSGSIZE)
5864 return args.iter.err;
5865 if (args.iter.count == cb->args[0])
5868 cb->args[0] = args.iter.count;
5876 static int nf_tables_dumpreset_set(struct sk_buff *skb,
5877 struct netlink_callback *cb)
5879 struct nftables_pernet *nft_net = nft_pernet(sock_net(skb->sk));
5880 struct nft_set_dump_ctx *dump_ctx = cb->data;
5881 int ret, skip = cb->args[0];
5883 mutex_lock(&nft_net->commit_mutex);
5885 ret = nf_tables_dump_set(skb, cb);
5887 if (cb->args[0] > skip)
5888 audit_log_nft_set_reset(dump_ctx->ctx.table, cb->seq,
5889 cb->args[0] - skip);
5891 mutex_unlock(&nft_net->commit_mutex);
5896 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5898 struct nft_set_dump_ctx *dump_ctx = cb->data;
5900 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5902 return cb->data ? 0 : -ENOMEM;
5905 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5911 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5912 const struct nft_ctx *ctx, u32 seq,
5913 u32 portid, int event, u16 flags,
5914 const struct nft_set *set,
5915 const struct nft_elem_priv *elem_priv,
5918 struct nlmsghdr *nlh;
5919 struct nlattr *nest;
5922 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5923 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5924 NFNETLINK_V0, nft_base_seq(ctx->net));
5926 goto nla_put_failure;
5928 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5929 goto nla_put_failure;
5930 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5931 goto nla_put_failure;
5933 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5935 goto nla_put_failure;
5937 err = nf_tables_fill_setelem(skb, set, elem_priv, reset);
5939 goto nla_put_failure;
5941 nla_nest_end(skb, nest);
5943 nlmsg_end(skb, nlh);
5947 nlmsg_trim(skb, nlh);
5951 static int nft_setelem_parse_flags(const struct nft_set *set,
5952 const struct nlattr *attr, u32 *flags)
5957 *flags = ntohl(nla_get_be32(attr));
5958 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5960 if (!(set->flags & NFT_SET_INTERVAL) &&
5961 *flags & NFT_SET_ELEM_INTERVAL_END)
5963 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5964 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5970 static int nft_setelem_parse_key(struct nft_ctx *ctx, const struct nft_set *set,
5971 struct nft_data *key, struct nlattr *attr)
5973 struct nft_data_desc desc = {
5974 .type = NFT_DATA_VALUE,
5975 .size = NFT_DATA_VALUE_MAXLEN,
5979 return nft_data_init(ctx, key, &desc, attr);
5982 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5983 struct nft_data_desc *desc,
5984 struct nft_data *data,
5985 struct nlattr *attr)
5989 if (set->dtype == NFT_DATA_VERDICT)
5990 dtype = NFT_DATA_VERDICT;
5992 dtype = NFT_DATA_VALUE;
5995 desc->size = NFT_DATA_VALUE_MAXLEN;
5996 desc->len = set->dlen;
5997 desc->flags = NFT_DATA_DESC_SETELEM;
5999 return nft_data_init(ctx, data, desc, attr);
6002 static void *nft_setelem_catchall_get(const struct net *net,
6003 const struct nft_set *set)
6005 struct nft_set_elem_catchall *catchall;
6006 u8 genmask = nft_genmask_cur(net);
6007 struct nft_set_ext *ext;
6010 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6011 ext = nft_set_elem_ext(set, catchall->elem);
6012 if (!nft_set_elem_active(ext, genmask) ||
6013 nft_set_elem_expired(ext))
6016 priv = catchall->elem;
6023 static int nft_setelem_get(struct nft_ctx *ctx, const struct nft_set *set,
6024 struct nft_set_elem *elem, u32 flags)
6028 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6029 priv = set->ops->get(ctx->net, set, elem, flags);
6031 return PTR_ERR(priv);
6033 priv = nft_setelem_catchall_get(ctx->net, set);
6042 static int nft_get_set_elem(struct nft_ctx *ctx, const struct nft_set *set,
6043 const struct nlattr *attr, bool reset)
6045 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6046 struct nft_set_elem elem;
6047 struct sk_buff *skb;
6051 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6052 nft_set_elem_policy, NULL);
6056 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6060 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6063 if (nla[NFTA_SET_ELEM_KEY]) {
6064 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6065 nla[NFTA_SET_ELEM_KEY]);
6070 if (nla[NFTA_SET_ELEM_KEY_END]) {
6071 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6072 nla[NFTA_SET_ELEM_KEY_END]);
6077 err = nft_setelem_get(ctx, set, &elem, flags);
6082 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6086 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6087 NFT_MSG_NEWSETELEM, 0, set, elem.priv,
6090 goto err_fill_setelem;
6092 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6099 static int nft_set_dump_ctx_init(struct nft_set_dump_ctx *dump_ctx,
6100 const struct sk_buff *skb,
6101 const struct nfnl_info *info,
6102 const struct nlattr * const nla[],
6105 struct netlink_ext_ack *extack = info->extack;
6106 u8 genmask = nft_genmask_cur(info->net);
6107 u8 family = info->nfmsg->nfgen_family;
6108 struct net *net = info->net;
6109 struct nft_table *table;
6110 struct nft_set *set;
6112 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6114 if (IS_ERR(table)) {
6115 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6116 return PTR_ERR(table);
6119 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6121 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
6122 return PTR_ERR(set);
6125 nft_ctx_init(&dump_ctx->ctx, net, skb,
6126 info->nlh, family, table, NULL, nla);
6127 dump_ctx->set = set;
6128 dump_ctx->reset = reset;
6132 /* called with rcu_read_lock held */
6133 static int nf_tables_getsetelem(struct sk_buff *skb,
6134 const struct nfnl_info *info,
6135 const struct nlattr * const nla[])
6137 struct netlink_ext_ack *extack = info->extack;
6138 struct nft_set_dump_ctx dump_ctx;
6139 struct nlattr *attr;
6142 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6143 struct netlink_dump_control c = {
6144 .start = nf_tables_dump_set_start,
6145 .dump = nf_tables_dump_set,
6146 .done = nf_tables_dump_set_done,
6147 .module = THIS_MODULE,
6150 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6155 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6158 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6161 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, false);
6165 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6166 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, false);
6168 NL_SET_BAD_ATTR(extack, attr);
6176 static int nf_tables_getsetelem_reset(struct sk_buff *skb,
6177 const struct nfnl_info *info,
6178 const struct nlattr * const nla[])
6180 struct nftables_pernet *nft_net = nft_pernet(info->net);
6181 struct netlink_ext_ack *extack = info->extack;
6182 struct nft_set_dump_ctx dump_ctx;
6183 int rem, err = 0, nelems = 0;
6184 struct nlattr *attr;
6186 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6187 struct netlink_dump_control c = {
6188 .start = nf_tables_dump_set_start,
6189 .dump = nf_tables_dumpreset_set,
6190 .done = nf_tables_dump_set_done,
6191 .module = THIS_MODULE,
6194 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6199 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6202 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6205 if (!try_module_get(THIS_MODULE))
6208 mutex_lock(&nft_net->commit_mutex);
6211 err = nft_set_dump_ctx_init(&dump_ctx, skb, info, nla, true);
6215 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6216 err = nft_get_set_elem(&dump_ctx.ctx, dump_ctx.set, attr, true);
6218 NL_SET_BAD_ATTR(extack, attr);
6223 audit_log_nft_set_reset(dump_ctx.ctx.table, nft_net->base_seq, nelems);
6227 mutex_unlock(&nft_net->commit_mutex);
6229 module_put(THIS_MODULE);
6234 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6235 const struct nft_set *set,
6236 const struct nft_elem_priv *elem_priv,
6239 struct nftables_pernet *nft_net;
6240 struct net *net = ctx->net;
6241 u32 portid = ctx->portid;
6242 struct sk_buff *skb;
6246 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6249 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6253 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6254 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6256 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6257 set, elem_priv, false);
6263 nft_net = nft_pernet(net);
6264 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6267 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6270 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6272 struct nft_set *set)
6274 struct nft_trans *trans;
6276 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6280 nft_trans_elem_set(trans) = set;
6284 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6285 const struct nft_set *set,
6286 const struct nlattr *attr)
6288 struct nft_expr *expr;
6291 expr = nft_expr_init(ctx, attr);
6296 if (expr->ops->type->flags & NFT_EXPR_GC) {
6297 if (set->flags & NFT_SET_TIMEOUT)
6298 goto err_set_elem_expr;
6299 if (!set->ops->gc_init)
6300 goto err_set_elem_expr;
6301 set->ops->gc_init(set);
6307 nft_expr_destroy(ctx, expr);
6308 return ERR_PTR(err);
6311 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6313 len += nft_set_ext_types[id].len;
6314 if (len > tmpl->ext_len[id] ||
6321 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6322 void *to, const void *from, u32 len)
6324 if (nft_set_ext_check(tmpl, id, len) < 0)
6327 memcpy(to, from, len);
6332 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
6333 const struct nft_set_ext_tmpl *tmpl,
6334 const u32 *key, const u32 *key_end,
6336 u64 timeout, u64 expiration, gfp_t gfp)
6338 struct nft_set_ext *ext;
6341 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6343 return ERR_PTR(-ENOMEM);
6345 ext = nft_set_elem_ext(set, elem);
6346 nft_set_ext_init(ext, tmpl);
6348 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6349 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6350 nft_set_ext_key(ext), key, set->klen) < 0)
6353 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6354 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6355 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6358 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6359 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6360 nft_set_ext_data(ext), data, set->dlen) < 0)
6363 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6364 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6365 if (expiration == 0)
6366 *nft_set_ext_expiration(ext) += timeout;
6368 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6369 *nft_set_ext_timeout(ext) = timeout;
6376 return ERR_PTR(-EINVAL);
6379 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6380 struct nft_expr *expr)
6382 if (expr->ops->destroy_clone) {
6383 expr->ops->destroy_clone(ctx, expr);
6384 module_put(expr->ops->type->owner);
6386 nf_tables_expr_destroy(ctx, expr);
6390 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6391 struct nft_set_elem_expr *elem_expr)
6393 struct nft_expr *expr;
6396 nft_setelem_expr_foreach(expr, elem_expr, size)
6397 __nft_set_elem_expr_destroy(ctx, expr);
6400 /* Drop references and destroy. Called from gc, dynset and abort path. */
6401 void nft_set_elem_destroy(const struct nft_set *set,
6402 const struct nft_elem_priv *elem_priv,
6405 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6406 struct nft_ctx ctx = {
6407 .net = read_pnet(&set->net),
6408 .family = set->table->family,
6411 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6412 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6413 nft_data_release(nft_set_ext_data(ext), set->dtype);
6414 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6415 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6416 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6417 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6421 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6423 /* Destroy element. References have been already dropped in the preparation
6424 * path via nft_setelem_data_deactivate().
6426 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6427 const struct nft_set *set,
6428 const struct nft_elem_priv *elem_priv)
6430 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6432 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6433 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6438 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6439 struct nft_expr *expr_array[])
6441 struct nft_expr *expr;
6444 for (i = 0; i < set->num_exprs; i++) {
6445 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6449 err = nft_expr_clone(expr, set->exprs[i]);
6454 expr_array[i] = expr;
6460 for (k = i - 1; k >= 0; k--)
6461 nft_expr_destroy(ctx, expr_array[k]);
6466 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6467 const struct nft_set_ext_tmpl *tmpl,
6468 const struct nft_set_ext *ext,
6469 struct nft_expr *expr_array[],
6472 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6473 u32 len = sizeof(struct nft_set_elem_expr);
6474 struct nft_expr *expr;
6480 for (i = 0; i < num_exprs; i++)
6481 len += expr_array[i]->ops->size;
6483 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6486 for (i = 0; i < num_exprs; i++) {
6487 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6488 err = nft_expr_clone(expr, expr_array[i]);
6490 goto err_elem_expr_setup;
6492 elem_expr->size += expr_array[i]->ops->size;
6493 nft_expr_destroy(ctx, expr_array[i]);
6494 expr_array[i] = NULL;
6499 err_elem_expr_setup:
6500 for (; i < num_exprs; i++) {
6501 nft_expr_destroy(ctx, expr_array[i]);
6502 expr_array[i] = NULL;
6508 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6509 const struct nft_set *set)
6511 struct nft_set_elem_catchall *catchall;
6512 u8 genmask = nft_genmask_cur(net);
6513 struct nft_set_ext *ext;
6515 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6516 ext = nft_set_elem_ext(set, catchall->elem);
6517 if (nft_set_elem_active(ext, genmask) &&
6518 !nft_set_elem_expired(ext) &&
6519 !nft_set_elem_is_dead(ext))
6525 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6527 static int nft_setelem_catchall_insert(const struct net *net,
6528 struct nft_set *set,
6529 const struct nft_set_elem *elem,
6530 struct nft_elem_priv **priv)
6532 struct nft_set_elem_catchall *catchall;
6533 u8 genmask = nft_genmask_next(net);
6534 struct nft_set_ext *ext;
6536 list_for_each_entry(catchall, &set->catchall_list, list) {
6537 ext = nft_set_elem_ext(set, catchall->elem);
6538 if (nft_set_elem_active(ext, genmask)) {
6539 *priv = catchall->elem;
6544 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6548 catchall->elem = elem->priv;
6549 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6554 static int nft_setelem_insert(const struct net *net,
6555 struct nft_set *set,
6556 const struct nft_set_elem *elem,
6557 struct nft_elem_priv **elem_priv,
6562 if (flags & NFT_SET_ELEM_CATCHALL)
6563 ret = nft_setelem_catchall_insert(net, set, elem, elem_priv);
6565 ret = set->ops->insert(net, set, elem, elem_priv);
6570 static bool nft_setelem_is_catchall(const struct nft_set *set,
6571 const struct nft_elem_priv *elem_priv)
6573 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6575 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6576 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6582 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6583 struct nft_elem_priv *elem_priv)
6585 struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
6587 if (nft_setelem_is_catchall(set, elem_priv)) {
6588 nft_set_elem_change_active(net, set, ext);
6590 set->ops->activate(net, set, elem_priv);
6594 static int nft_setelem_catchall_deactivate(const struct net *net,
6595 struct nft_set *set,
6596 struct nft_set_elem *elem)
6598 struct nft_set_elem_catchall *catchall;
6599 struct nft_set_ext *ext;
6601 list_for_each_entry(catchall, &set->catchall_list, list) {
6602 ext = nft_set_elem_ext(set, catchall->elem);
6603 if (!nft_is_active_next(net, ext))
6607 elem->priv = catchall->elem;
6608 nft_set_elem_change_active(net, set, ext);
6615 static int __nft_setelem_deactivate(const struct net *net,
6616 struct nft_set *set,
6617 struct nft_set_elem *elem)
6621 priv = set->ops->deactivate(net, set, elem);
6632 static int nft_setelem_deactivate(const struct net *net,
6633 struct nft_set *set,
6634 struct nft_set_elem *elem, u32 flags)
6638 if (flags & NFT_SET_ELEM_CATCHALL)
6639 ret = nft_setelem_catchall_deactivate(net, set, elem);
6641 ret = __nft_setelem_deactivate(net, set, elem);
6646 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6648 list_del_rcu(&catchall->list);
6649 kfree_rcu(catchall, rcu);
6652 static void nft_setelem_catchall_remove(const struct net *net,
6653 const struct nft_set *set,
6654 struct nft_elem_priv *elem_priv)
6656 struct nft_set_elem_catchall *catchall, *next;
6658 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6659 if (catchall->elem == elem_priv) {
6660 nft_setelem_catchall_destroy(catchall);
6666 static void nft_setelem_remove(const struct net *net,
6667 const struct nft_set *set,
6668 struct nft_elem_priv *elem_priv)
6670 if (nft_setelem_is_catchall(set, elem_priv))
6671 nft_setelem_catchall_remove(net, set, elem_priv);
6673 set->ops->remove(net, set, elem_priv);
6676 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6677 struct nlattr **nla, u32 flags)
6679 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6680 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6681 if (flags & NFT_SET_ELEM_INTERVAL_END)
6684 if (nla[NFTA_SET_ELEM_KEY_END] &&
6685 flags & NFT_SET_ELEM_CATCHALL)
6688 if (nla[NFTA_SET_ELEM_KEY_END])
6695 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6696 const struct nlattr *attr, u32 nlmsg_flags)
6698 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6699 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6700 u8 genmask = nft_genmask_next(ctx->net);
6701 u32 flags = 0, size = 0, num_exprs = 0;
6702 struct nft_set_ext_tmpl tmpl;
6703 struct nft_set_ext *ext, *ext2;
6704 struct nft_set_elem elem;
6705 struct nft_set_binding *binding;
6706 struct nft_elem_priv *elem_priv;
6707 struct nft_object *obj = NULL;
6708 struct nft_userdata *udata;
6709 struct nft_data_desc desc;
6710 enum nft_registers dreg;
6711 struct nft_trans *trans;
6717 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6718 nft_set_elem_policy, NULL);
6722 nft_set_ext_prepare(&tmpl);
6724 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6728 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6729 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6733 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6738 if (set->flags & NFT_SET_MAP) {
6739 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6740 !(flags & NFT_SET_ELEM_INTERVAL_END))
6743 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6747 if (set->flags & NFT_SET_OBJECT) {
6748 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6749 !(flags & NFT_SET_ELEM_INTERVAL_END))
6752 if (nla[NFTA_SET_ELEM_OBJREF])
6756 if (!nft_setelem_valid_key_end(set, nla, flags))
6759 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6760 (nla[NFTA_SET_ELEM_DATA] ||
6761 nla[NFTA_SET_ELEM_OBJREF] ||
6762 nla[NFTA_SET_ELEM_TIMEOUT] ||
6763 nla[NFTA_SET_ELEM_EXPIRATION] ||
6764 nla[NFTA_SET_ELEM_USERDATA] ||
6765 nla[NFTA_SET_ELEM_EXPR] ||
6766 nla[NFTA_SET_ELEM_KEY_END] ||
6767 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6771 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6772 if (!(set->flags & NFT_SET_TIMEOUT))
6774 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6778 } else if (set->flags & NFT_SET_TIMEOUT &&
6779 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6780 timeout = READ_ONCE(set->timeout);
6784 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6785 if (!(set->flags & NFT_SET_TIMEOUT))
6787 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6793 if (nla[NFTA_SET_ELEM_EXPR]) {
6794 struct nft_expr *expr;
6796 if (set->num_exprs && set->num_exprs != 1)
6799 expr = nft_set_elem_expr_alloc(ctx, set,
6800 nla[NFTA_SET_ELEM_EXPR]);
6802 return PTR_ERR(expr);
6804 expr_array[0] = expr;
6807 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6809 goto err_set_elem_expr;
6811 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6812 struct nft_expr *expr;
6817 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6818 if (i == NFT_SET_EXPR_MAX ||
6819 (set->num_exprs && set->num_exprs == i)) {
6821 goto err_set_elem_expr;
6823 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6825 goto err_set_elem_expr;
6827 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6829 err = PTR_ERR(expr);
6830 goto err_set_elem_expr;
6832 expr_array[i] = expr;
6835 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6837 goto err_set_elem_expr;
6841 if (set->num_exprs && set->num_exprs != i) {
6843 goto err_set_elem_expr;
6845 } else if (set->num_exprs > 0 &&
6846 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6847 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6849 goto err_set_elem_expr_clone;
6851 num_exprs = set->num_exprs;
6854 if (nla[NFTA_SET_ELEM_KEY]) {
6855 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6856 nla[NFTA_SET_ELEM_KEY]);
6858 goto err_set_elem_expr;
6860 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6865 if (nla[NFTA_SET_ELEM_KEY_END]) {
6866 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6867 nla[NFTA_SET_ELEM_KEY_END]);
6871 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6873 goto err_parse_key_end;
6877 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6879 goto err_parse_key_end;
6881 if (timeout != READ_ONCE(set->timeout)) {
6882 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6884 goto err_parse_key_end;
6889 for (i = 0; i < num_exprs; i++)
6890 size += expr_array[i]->ops->size;
6892 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6893 sizeof(struct nft_set_elem_expr) + size);
6895 goto err_parse_key_end;
6898 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6899 obj = nft_obj_lookup(ctx->net, ctx->table,
6900 nla[NFTA_SET_ELEM_OBJREF],
6901 set->objtype, genmask);
6905 goto err_parse_key_end;
6908 if (!nft_use_inc(&obj->use)) {
6911 goto err_parse_key_end;
6914 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6916 goto err_parse_key_end;
6919 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6920 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6921 nla[NFTA_SET_ELEM_DATA]);
6923 goto err_parse_key_end;
6925 dreg = nft_type_to_reg(set->dtype);
6926 list_for_each_entry(binding, &set->bindings, list) {
6927 struct nft_ctx bind_ctx = {
6929 .family = ctx->family,
6930 .table = ctx->table,
6931 .chain = (struct nft_chain *)binding->chain,
6934 if (!(binding->flags & NFT_SET_MAP))
6937 err = nft_validate_register_store(&bind_ctx, dreg,
6939 desc.type, desc.len);
6941 goto err_parse_data;
6943 if (desc.type == NFT_DATA_VERDICT &&
6944 (elem.data.val.verdict.code == NFT_GOTO ||
6945 elem.data.val.verdict.code == NFT_JUMP))
6946 nft_validate_state_update(ctx->table,
6950 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6952 goto err_parse_data;
6955 /* The full maximum length of userdata can exceed the maximum
6956 * offset value (U8_MAX) for following extensions, therefor it
6957 * must be the last extension added.
6960 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6961 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6963 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6966 goto err_parse_data;
6970 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6971 elem.key_end.val.data, elem.data.val.data,
6972 timeout, expiration, GFP_KERNEL_ACCOUNT);
6973 if (IS_ERR(elem.priv)) {
6974 err = PTR_ERR(elem.priv);
6975 goto err_parse_data;
6978 ext = nft_set_elem_ext(set, elem.priv);
6980 *nft_set_ext_flags(ext) = flags;
6983 *nft_set_ext_obj(ext) = obj;
6986 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6990 udata = nft_set_ext_userdata(ext);
6991 udata->len = ulen - 1;
6992 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6994 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6998 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6999 if (trans == NULL) {
7004 ext->genmask = nft_genmask_cur(ctx->net);
7006 err = nft_setelem_insert(ctx->net, set, &elem, &elem_priv, flags);
7008 if (err == -EEXIST) {
7009 ext2 = nft_set_elem_ext(set, elem_priv);
7010 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
7011 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
7012 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
7013 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
7014 goto err_element_clash;
7015 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
7016 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
7017 memcmp(nft_set_ext_data(ext),
7018 nft_set_ext_data(ext2), set->dlen) != 0) ||
7019 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
7020 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
7021 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
7022 goto err_element_clash;
7023 else if (!(nlmsg_flags & NLM_F_EXCL))
7025 } else if (err == -ENOTEMPTY) {
7026 /* ENOTEMPTY reports overlapping between this element
7027 * and an existing one.
7031 goto err_element_clash;
7034 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
7035 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
7037 if (!atomic_add_unless(&set->nelems, 1, max)) {
7043 nft_trans_elem_priv(trans) = elem.priv;
7044 nft_trans_commit_list_add_tail(ctx->net, trans);
7048 nft_setelem_remove(ctx->net, set, elem.priv);
7052 nf_tables_set_elem_destroy(ctx, set, elem.priv);
7054 if (nla[NFTA_SET_ELEM_DATA] != NULL)
7055 nft_data_release(&elem.data.val, desc.type);
7058 nft_use_dec_restore(&obj->use);
7060 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7062 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7064 for (i = 0; i < num_exprs && expr_array[i]; i++)
7065 nft_expr_destroy(ctx, expr_array[i]);
7066 err_set_elem_expr_clone:
7070 static int nf_tables_newsetelem(struct sk_buff *skb,
7071 const struct nfnl_info *info,
7072 const struct nlattr * const nla[])
7074 struct netlink_ext_ack *extack = info->extack;
7075 u8 genmask = nft_genmask_next(info->net);
7076 u8 family = info->nfmsg->nfgen_family;
7077 struct net *net = info->net;
7078 const struct nlattr *attr;
7079 struct nft_table *table;
7080 struct nft_set *set;
7084 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
7087 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7088 genmask, NETLINK_CB(skb).portid);
7089 if (IS_ERR(table)) {
7090 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7091 return PTR_ERR(table);
7094 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
7095 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
7097 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7098 return PTR_ERR(set);
7101 if (!list_empty(&set->bindings) &&
7102 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
7105 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7107 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7108 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
7110 NL_SET_BAD_ATTR(extack, attr);
7115 if (table->validate_state == NFT_VALIDATE_DO)
7116 return nft_table_validate(net, table);
7122 * nft_data_hold - hold a nft_data item
7124 * @data: struct nft_data to release
7125 * @type: type of data
7127 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
7128 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
7129 * NFT_GOTO verdicts. This function must be called on active data objects
7130 * from the second phase of the commit protocol.
7132 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
7134 struct nft_chain *chain;
7136 if (type == NFT_DATA_VERDICT) {
7137 switch (data->verdict.code) {
7140 chain = data->verdict.chain;
7141 nft_use_inc_restore(&chain->use);
7147 static void nft_setelem_data_activate(const struct net *net,
7148 const struct nft_set *set,
7149 struct nft_elem_priv *elem_priv)
7151 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7153 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7154 nft_data_hold(nft_set_ext_data(ext), set->dtype);
7155 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7156 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
7159 void nft_setelem_data_deactivate(const struct net *net,
7160 const struct nft_set *set,
7161 struct nft_elem_priv *elem_priv)
7163 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
7165 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7166 nft_data_release(nft_set_ext_data(ext), set->dtype);
7167 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7168 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7171 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7172 const struct nlattr *attr)
7174 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7175 struct nft_set_ext_tmpl tmpl;
7176 struct nft_set_elem elem;
7177 struct nft_set_ext *ext;
7178 struct nft_trans *trans;
7182 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7183 nft_set_elem_policy, NULL);
7187 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7191 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7194 if (!nft_setelem_valid_key_end(set, nla, flags))
7197 nft_set_ext_prepare(&tmpl);
7200 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7205 if (nla[NFTA_SET_ELEM_KEY]) {
7206 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7207 nla[NFTA_SET_ELEM_KEY]);
7211 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7216 if (nla[NFTA_SET_ELEM_KEY_END]) {
7217 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7218 nla[NFTA_SET_ELEM_KEY_END]);
7222 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7224 goto fail_elem_key_end;
7228 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7229 elem.key_end.val.data, NULL, 0, 0,
7230 GFP_KERNEL_ACCOUNT);
7231 if (IS_ERR(elem.priv)) {
7232 err = PTR_ERR(elem.priv);
7233 goto fail_elem_key_end;
7236 ext = nft_set_elem_ext(set, elem.priv);
7238 *nft_set_ext_flags(ext) = flags;
7240 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7244 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7248 nft_setelem_data_deactivate(ctx->net, set, elem.priv);
7250 nft_trans_elem_priv(trans) = elem.priv;
7251 nft_trans_commit_list_add_tail(ctx->net, trans);
7259 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7261 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7265 static int nft_setelem_flush(const struct nft_ctx *ctx,
7266 struct nft_set *set,
7267 const struct nft_set_iter *iter,
7268 struct nft_elem_priv *elem_priv)
7270 struct nft_trans *trans;
7272 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7273 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7277 set->ops->flush(ctx->net, set, elem_priv);
7280 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7281 nft_trans_elem_set(trans) = set;
7282 nft_trans_elem_priv(trans) = elem_priv;
7283 nft_trans_commit_list_add_tail(ctx->net, trans);
7288 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7289 struct nft_set *set,
7290 struct nft_elem_priv *elem_priv)
7292 struct nft_trans *trans;
7294 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7295 sizeof(struct nft_trans_elem), GFP_KERNEL);
7299 nft_setelem_data_deactivate(ctx->net, set, elem_priv);
7300 nft_trans_elem_set(trans) = set;
7301 nft_trans_elem_priv(trans) = elem_priv;
7302 nft_trans_commit_list_add_tail(ctx->net, trans);
7307 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7308 struct nft_set *set)
7310 u8 genmask = nft_genmask_next(ctx->net);
7311 struct nft_set_elem_catchall *catchall;
7312 struct nft_set_ext *ext;
7315 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7316 ext = nft_set_elem_ext(set, catchall->elem);
7317 if (!nft_set_elem_active(ext, genmask))
7320 ret = __nft_set_catchall_flush(ctx, set, catchall->elem);
7323 nft_set_elem_change_active(ctx->net, set, ext);
7329 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7331 struct nft_set_iter iter = {
7333 .fn = nft_setelem_flush,
7336 set->ops->walk(ctx, set, &iter);
7338 iter.err = nft_set_catchall_flush(ctx, set);
7343 static int nf_tables_delsetelem(struct sk_buff *skb,
7344 const struct nfnl_info *info,
7345 const struct nlattr * const nla[])
7347 struct netlink_ext_ack *extack = info->extack;
7348 u8 genmask = nft_genmask_next(info->net);
7349 u8 family = info->nfmsg->nfgen_family;
7350 struct net *net = info->net;
7351 const struct nlattr *attr;
7352 struct nft_table *table;
7353 struct nft_set *set;
7357 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7358 genmask, NETLINK_CB(skb).portid);
7359 if (IS_ERR(table)) {
7360 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7361 return PTR_ERR(table);
7364 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7366 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_SET]);
7367 return PTR_ERR(set);
7370 if (nft_set_is_anonymous(set))
7373 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7376 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7378 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7379 return nft_set_flush(&ctx, set, genmask);
7381 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7382 err = nft_del_setelem(&ctx, set, attr);
7383 if (err == -ENOENT &&
7384 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7388 NL_SET_BAD_ATTR(extack, attr);
7401 * nft_register_obj- register nf_tables stateful object type
7402 * @obj_type: object type
7404 * Registers the object type for use with nf_tables. Returns zero on
7405 * success or a negative errno code otherwise.
7407 int nft_register_obj(struct nft_object_type *obj_type)
7409 if (obj_type->type == NFT_OBJECT_UNSPEC)
7412 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7413 list_add_rcu(&obj_type->list, &nf_tables_objects);
7414 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7417 EXPORT_SYMBOL_GPL(nft_register_obj);
7420 * nft_unregister_obj - unregister nf_tables object type
7421 * @obj_type: object type
7423 * Unregisters the object type for use with nf_tables.
7425 void nft_unregister_obj(struct nft_object_type *obj_type)
7427 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7428 list_del_rcu(&obj_type->list);
7429 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7431 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7433 struct nft_object *nft_obj_lookup(const struct net *net,
7434 const struct nft_table *table,
7435 const struct nlattr *nla, u32 objtype,
7438 struct nft_object_hash_key k = { .table = table };
7439 char search[NFT_OBJ_MAXNAMELEN];
7440 struct rhlist_head *tmp, *list;
7441 struct nft_object *obj;
7443 nla_strscpy(search, nla, sizeof(search));
7446 WARN_ON_ONCE(!rcu_read_lock_held() &&
7447 !lockdep_commit_lock_is_held(net));
7450 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7454 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7455 if (objtype == obj->ops->type->type &&
7456 nft_active_genmask(obj, genmask)) {
7463 return ERR_PTR(-ENOENT);
7465 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7467 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7468 const struct nlattr *nla,
7469 u32 objtype, u8 genmask)
7471 struct nft_object *obj;
7473 list_for_each_entry(obj, &table->objects, list) {
7474 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7475 objtype == obj->ops->type->type &&
7476 nft_active_genmask(obj, genmask))
7479 return ERR_PTR(-ENOENT);
7482 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7483 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7484 .len = NFT_TABLE_MAXNAMELEN - 1 },
7485 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7486 .len = NFT_OBJ_MAXNAMELEN - 1 },
7487 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7488 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7489 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7490 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7491 .len = NFT_USERDATA_MAXLEN },
7494 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7495 const struct nft_object_type *type,
7496 const struct nlattr *attr)
7499 const struct nft_object_ops *ops;
7500 struct nft_object *obj;
7503 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7508 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7509 type->policy, NULL);
7513 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7516 if (type->select_ops) {
7517 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7527 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7531 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7544 return ERR_PTR(err);
7547 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7548 struct nft_object *obj, bool reset)
7550 struct nlattr *nest;
7552 nest = nla_nest_start_noflag(skb, attr);
7554 goto nla_put_failure;
7555 if (obj->ops->dump(skb, obj, reset) < 0)
7556 goto nla_put_failure;
7557 nla_nest_end(skb, nest);
7564 static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
7566 const struct nft_object_type *type;
7568 list_for_each_entry(type, &nf_tables_objects, list) {
7569 if (type->family != NFPROTO_UNSPEC &&
7570 type->family != family)
7573 if (objtype == type->type)
7579 static const struct nft_object_type *
7580 nft_obj_type_get(struct net *net, u32 objtype, u8 family)
7582 const struct nft_object_type *type;
7584 type = __nft_obj_type_get(objtype, family);
7585 if (type != NULL && try_module_get(type->owner))
7588 lockdep_nfnl_nft_mutex_not_held();
7589 #ifdef CONFIG_MODULES
7591 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7592 return ERR_PTR(-EAGAIN);
7595 return ERR_PTR(-ENOENT);
7598 static int nf_tables_updobj(const struct nft_ctx *ctx,
7599 const struct nft_object_type *type,
7600 const struct nlattr *attr,
7601 struct nft_object *obj)
7603 struct nft_object *newobj;
7604 struct nft_trans *trans;
7607 if (!try_module_get(type->owner))
7610 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7611 sizeof(struct nft_trans_obj));
7615 newobj = nft_obj_init(ctx, type, attr);
7616 if (IS_ERR(newobj)) {
7617 err = PTR_ERR(newobj);
7618 goto err_free_trans;
7621 nft_trans_obj(trans) = obj;
7622 nft_trans_obj_update(trans) = true;
7623 nft_trans_obj_newobj(trans) = newobj;
7624 nft_trans_commit_list_add_tail(ctx->net, trans);
7631 module_put(type->owner);
7635 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7636 const struct nlattr * const nla[])
7638 struct netlink_ext_ack *extack = info->extack;
7639 u8 genmask = nft_genmask_next(info->net);
7640 u8 family = info->nfmsg->nfgen_family;
7641 const struct nft_object_type *type;
7642 struct net *net = info->net;
7643 struct nft_table *table;
7644 struct nft_object *obj;
7649 if (!nla[NFTA_OBJ_TYPE] ||
7650 !nla[NFTA_OBJ_NAME] ||
7651 !nla[NFTA_OBJ_DATA])
7654 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7655 NETLINK_CB(skb).portid);
7656 if (IS_ERR(table)) {
7657 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7658 return PTR_ERR(table);
7661 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7662 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7665 if (err != -ENOENT) {
7666 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7670 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7671 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7674 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7677 type = __nft_obj_type_get(objtype, family);
7678 if (WARN_ON_ONCE(!type))
7681 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7683 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7686 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7688 if (!nft_use_inc(&table->use))
7691 type = nft_obj_type_get(net, objtype, family);
7693 err = PTR_ERR(type);
7697 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7702 obj->key.table = table;
7703 obj->handle = nf_tables_alloc_handle(table);
7705 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7706 if (!obj->key.name) {
7711 if (nla[NFTA_OBJ_USERDATA]) {
7712 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7713 if (obj->udata == NULL)
7716 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7719 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7723 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7724 nft_objname_ht_params);
7728 list_add_tail_rcu(&obj->list, &table->objects);
7732 /* queued in transaction log */
7733 INIT_LIST_HEAD(&obj->list);
7738 kfree(obj->key.name);
7740 if (obj->ops->destroy)
7741 obj->ops->destroy(&ctx, obj);
7744 module_put(type->owner);
7746 nft_use_dec_restore(&table->use);
7751 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7752 u32 portid, u32 seq, int event, u32 flags,
7753 int family, const struct nft_table *table,
7754 struct nft_object *obj, bool reset)
7756 struct nlmsghdr *nlh;
7758 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7759 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7760 NFNETLINK_V0, nft_base_seq(net));
7762 goto nla_put_failure;
7764 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7765 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7766 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7768 goto nla_put_failure;
7770 if (event == NFT_MSG_DELOBJ) {
7771 nlmsg_end(skb, nlh);
7775 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7776 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7777 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7778 goto nla_put_failure;
7781 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7782 goto nla_put_failure;
7784 nlmsg_end(skb, nlh);
7788 nlmsg_trim(skb, nlh);
7792 static void audit_log_obj_reset(const struct nft_table *table,
7793 unsigned int base_seq, unsigned int nentries)
7795 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7797 audit_log_nfcfg(buf, table->family, nentries,
7798 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7802 struct nft_obj_dump_ctx {
7809 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7811 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7812 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7813 struct net *net = sock_net(skb->sk);
7814 int family = nfmsg->nfgen_family;
7815 struct nftables_pernet *nft_net;
7816 const struct nft_table *table;
7817 unsigned int entries = 0;
7818 struct nft_object *obj;
7819 unsigned int idx = 0;
7823 nft_net = nft_pernet(net);
7824 cb->seq = READ_ONCE(nft_net->base_seq);
7826 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7827 if (family != NFPROTO_UNSPEC && family != table->family)
7831 list_for_each_entry_rcu(obj, &table->objects, list) {
7832 if (!nft_is_active(net, obj))
7834 if (idx < ctx->s_idx)
7836 if (ctx->table && strcmp(ctx->table, table->name))
7838 if (ctx->type != NFT_OBJECT_UNSPEC &&
7839 obj->ops->type->type != ctx->type)
7842 rc = nf_tables_fill_obj_info(skb, net,
7843 NETLINK_CB(cb->skb).portid,
7846 NLM_F_MULTI | NLM_F_APPEND,
7847 table->family, table,
7853 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7857 if (ctx->reset && entries)
7858 audit_log_obj_reset(table, nft_net->base_seq, entries);
7868 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7870 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7871 const struct nlattr * const *nla = cb->data;
7873 BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
7875 if (nla[NFTA_OBJ_TABLE]) {
7876 ctx->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7881 if (nla[NFTA_OBJ_TYPE])
7882 ctx->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7884 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7890 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7892 struct nft_obj_dump_ctx *ctx = (void *)cb->ctx;
7899 /* called with rcu_read_lock held */
7900 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7901 const struct nlattr * const nla[])
7903 struct netlink_ext_ack *extack = info->extack;
7904 u8 genmask = nft_genmask_cur(info->net);
7905 u8 family = info->nfmsg->nfgen_family;
7906 const struct nft_table *table;
7907 struct net *net = info->net;
7908 struct nft_object *obj;
7909 struct sk_buff *skb2;
7914 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7915 struct netlink_dump_control c = {
7916 .start = nf_tables_dump_obj_start,
7917 .dump = nf_tables_dump_obj,
7918 .done = nf_tables_dump_obj_done,
7919 .module = THIS_MODULE,
7920 .data = (void *)nla,
7923 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7926 if (!nla[NFTA_OBJ_NAME] ||
7927 !nla[NFTA_OBJ_TYPE])
7930 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7931 if (IS_ERR(table)) {
7932 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7933 return PTR_ERR(table);
7936 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7937 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7939 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7940 return PTR_ERR(obj);
7943 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7947 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7951 const struct nftables_pernet *nft_net;
7954 nft_net = nft_pernet(net);
7955 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7957 audit_log_nfcfg(buf,
7960 AUDIT_NFT_OP_OBJ_RESET,
7965 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7966 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7967 family, table, obj, reset);
7969 goto err_fill_obj_info;
7971 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7978 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7980 if (obj->ops->destroy)
7981 obj->ops->destroy(ctx, obj);
7983 module_put(obj->ops->type->owner);
7984 kfree(obj->key.name);
7989 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7990 const struct nlattr * const nla[])
7992 struct netlink_ext_ack *extack = info->extack;
7993 u8 genmask = nft_genmask_next(info->net);
7994 u8 family = info->nfmsg->nfgen_family;
7995 struct net *net = info->net;
7996 const struct nlattr *attr;
7997 struct nft_table *table;
7998 struct nft_object *obj;
8002 if (!nla[NFTA_OBJ_TYPE] ||
8003 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
8006 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
8007 NETLINK_CB(skb).portid);
8008 if (IS_ERR(table)) {
8009 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
8010 return PTR_ERR(table);
8013 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
8014 if (nla[NFTA_OBJ_HANDLE]) {
8015 attr = nla[NFTA_OBJ_HANDLE];
8016 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
8018 attr = nla[NFTA_OBJ_NAME];
8019 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
8023 if (PTR_ERR(obj) == -ENOENT &&
8024 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
8027 NL_SET_BAD_ATTR(extack, attr);
8028 return PTR_ERR(obj);
8031 NL_SET_BAD_ATTR(extack, attr);
8035 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8037 return nft_delobj(&ctx, obj);
8041 __nft_obj_notify(struct net *net, const struct nft_table *table,
8042 struct nft_object *obj, u32 portid, u32 seq, int event,
8043 u16 flags, int family, int report, gfp_t gfp)
8045 struct nftables_pernet *nft_net = nft_pernet(net);
8046 struct sk_buff *skb;
8050 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8053 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
8057 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
8058 flags & (NLM_F_CREATE | NLM_F_EXCL),
8059 family, table, obj, false);
8065 nft_notify_enqueue(skb, report, &nft_net->notify_list);
8068 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
8071 void nft_obj_notify(struct net *net, const struct nft_table *table,
8072 struct nft_object *obj, u32 portid, u32 seq, int event,
8073 u16 flags, int family, int report, gfp_t gfp)
8075 struct nftables_pernet *nft_net = nft_pernet(net);
8076 char *buf = kasprintf(gfp, "%s:%u",
8077 table->name, nft_net->base_seq);
8079 audit_log_nfcfg(buf,
8082 event == NFT_MSG_NEWOBJ ?
8083 AUDIT_NFT_OP_OBJ_REGISTER :
8084 AUDIT_NFT_OP_OBJ_UNREGISTER,
8088 __nft_obj_notify(net, table, obj, portid, seq, event,
8089 flags, family, report, gfp);
8091 EXPORT_SYMBOL_GPL(nft_obj_notify);
8093 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
8094 struct nft_object *obj, int event)
8096 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
8097 ctx->seq, event, ctx->flags, ctx->family,
8098 ctx->report, GFP_KERNEL);
8104 void nft_register_flowtable_type(struct nf_flowtable_type *type)
8106 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8107 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
8108 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8110 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
8112 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
8114 nfnl_lock(NFNL_SUBSYS_NFTABLES);
8115 list_del_rcu(&type->list);
8116 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
8118 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
8120 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
8121 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
8122 .len = NFT_NAME_MAXLEN - 1 },
8123 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
8124 .len = NFT_NAME_MAXLEN - 1 },
8125 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
8126 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
8127 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
8130 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
8131 const struct nlattr *nla, u8 genmask)
8133 struct nft_flowtable *flowtable;
8135 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8136 if (!nla_strcmp(nla, flowtable->name) &&
8137 nft_active_genmask(flowtable, genmask))
8140 return ERR_PTR(-ENOENT);
8142 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8144 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8145 struct nft_flowtable *flowtable,
8146 enum nft_trans_phase phase)
8149 case NFT_TRANS_PREPARE_ERROR:
8150 case NFT_TRANS_PREPARE:
8151 case NFT_TRANS_ABORT:
8152 case NFT_TRANS_RELEASE:
8153 nft_use_dec(&flowtable->use);
8159 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8161 static struct nft_flowtable *
8162 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8163 const struct nlattr *nla, u8 genmask)
8165 struct nft_flowtable *flowtable;
8167 list_for_each_entry(flowtable, &table->flowtables, list) {
8168 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8169 nft_active_genmask(flowtable, genmask))
8172 return ERR_PTR(-ENOENT);
8175 struct nft_flowtable_hook {
8178 struct list_head list;
8181 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8182 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8183 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8184 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8187 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8188 const struct nlattr * const nla[],
8189 struct nft_flowtable_hook *flowtable_hook,
8190 struct nft_flowtable *flowtable,
8191 struct netlink_ext_ack *extack, bool add)
8193 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8194 struct nft_hook *hook;
8195 int hooknum, priority;
8198 INIT_LIST_HEAD(&flowtable_hook->list);
8200 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8201 nla[NFTA_FLOWTABLE_HOOK],
8202 nft_flowtable_hook_policy, NULL);
8207 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8208 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8209 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8213 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8214 if (hooknum != NF_NETDEV_INGRESS)
8217 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8219 flowtable_hook->priority = priority;
8220 flowtable_hook->num = hooknum;
8222 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8223 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8224 if (hooknum != flowtable->hooknum)
8228 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8229 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8230 if (priority != flowtable->data.priority)
8234 flowtable_hook->priority = flowtable->data.priority;
8235 flowtable_hook->num = flowtable->hooknum;
8238 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8239 err = nf_tables_parse_netdev_hooks(ctx->net,
8240 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8241 &flowtable_hook->list,
8247 list_for_each_entry(hook, &flowtable_hook->list, list) {
8248 hook->ops.pf = NFPROTO_NETDEV;
8249 hook->ops.hooknum = flowtable_hook->num;
8250 hook->ops.priority = flowtable_hook->priority;
8251 hook->ops.priv = &flowtable->data;
8252 hook->ops.hook = flowtable->data.type->hook;
8258 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8260 const struct nf_flowtable_type *type;
8262 list_for_each_entry(type, &nf_tables_flowtables, list) {
8263 if (family == type->family)
8269 static const struct nf_flowtable_type *
8270 nft_flowtable_type_get(struct net *net, u8 family)
8272 const struct nf_flowtable_type *type;
8274 type = __nft_flowtable_type_get(family);
8275 if (type != NULL && try_module_get(type->owner))
8278 lockdep_nfnl_nft_mutex_not_held();
8279 #ifdef CONFIG_MODULES
8281 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8282 return ERR_PTR(-EAGAIN);
8285 return ERR_PTR(-ENOENT);
8288 /* Only called from error and netdev event paths. */
8289 static void nft_unregister_flowtable_hook(struct net *net,
8290 struct nft_flowtable *flowtable,
8291 struct nft_hook *hook)
8293 nf_unregister_net_hook(net, &hook->ops);
8294 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8298 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8299 struct list_head *hook_list,
8300 bool release_netdev)
8302 struct nft_hook *hook, *next;
8304 list_for_each_entry_safe(hook, next, hook_list, list) {
8305 nf_unregister_net_hook(net, &hook->ops);
8306 if (release_netdev) {
8307 list_del(&hook->list);
8308 kfree_rcu(hook, rcu);
8313 static void nft_unregister_flowtable_net_hooks(struct net *net,
8314 struct list_head *hook_list)
8316 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8319 static int nft_register_flowtable_net_hooks(struct net *net,
8320 struct nft_table *table,
8321 struct list_head *hook_list,
8322 struct nft_flowtable *flowtable)
8324 struct nft_hook *hook, *hook2, *next;
8325 struct nft_flowtable *ft;
8328 list_for_each_entry(hook, hook_list, list) {
8329 list_for_each_entry(ft, &table->flowtables, list) {
8330 if (!nft_is_active_next(net, ft))
8333 list_for_each_entry(hook2, &ft->hook_list, list) {
8334 if (hook->ops.dev == hook2->ops.dev &&
8335 hook->ops.pf == hook2->ops.pf) {
8337 goto err_unregister_net_hooks;
8342 err = flowtable->data.type->setup(&flowtable->data,
8346 goto err_unregister_net_hooks;
8348 err = nf_register_net_hook(net, &hook->ops);
8350 flowtable->data.type->setup(&flowtable->data,
8353 goto err_unregister_net_hooks;
8361 err_unregister_net_hooks:
8362 list_for_each_entry_safe(hook, next, hook_list, list) {
8366 nft_unregister_flowtable_hook(net, flowtable, hook);
8367 list_del_rcu(&hook->list);
8368 kfree_rcu(hook, rcu);
8374 static void nft_hooks_destroy(struct list_head *hook_list)
8376 struct nft_hook *hook, *next;
8378 list_for_each_entry_safe(hook, next, hook_list, list) {
8379 list_del_rcu(&hook->list);
8380 kfree_rcu(hook, rcu);
8384 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8385 struct nft_flowtable *flowtable,
8386 struct netlink_ext_ack *extack)
8388 const struct nlattr * const *nla = ctx->nla;
8389 struct nft_flowtable_hook flowtable_hook;
8390 struct nft_hook *hook, *next;
8391 struct nft_trans *trans;
8392 bool unregister = false;
8396 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8401 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8402 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8403 list_del(&hook->list);
8408 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8409 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8410 if (flags & ~NFT_FLOWTABLE_MASK) {
8412 goto err_flowtable_update_hook;
8414 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8415 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8417 goto err_flowtable_update_hook;
8420 flags = flowtable->data.flags;
8423 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8424 &flowtable_hook.list, flowtable);
8426 goto err_flowtable_update_hook;
8428 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8429 sizeof(struct nft_trans_flowtable));
8433 goto err_flowtable_update_hook;
8436 nft_trans_flowtable_flags(trans) = flags;
8437 nft_trans_flowtable(trans) = flowtable;
8438 nft_trans_flowtable_update(trans) = true;
8439 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8440 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8442 nft_trans_commit_list_add_tail(ctx->net, trans);
8446 err_flowtable_update_hook:
8447 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8449 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8450 list_del_rcu(&hook->list);
8451 kfree_rcu(hook, rcu);
8458 static int nf_tables_newflowtable(struct sk_buff *skb,
8459 const struct nfnl_info *info,
8460 const struct nlattr * const nla[])
8462 struct netlink_ext_ack *extack = info->extack;
8463 struct nft_flowtable_hook flowtable_hook;
8464 u8 genmask = nft_genmask_next(info->net);
8465 u8 family = info->nfmsg->nfgen_family;
8466 const struct nf_flowtable_type *type;
8467 struct nft_flowtable *flowtable;
8468 struct net *net = info->net;
8469 struct nft_table *table;
8470 struct nft_trans *trans;
8474 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8475 !nla[NFTA_FLOWTABLE_NAME] ||
8476 !nla[NFTA_FLOWTABLE_HOOK])
8479 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8480 genmask, NETLINK_CB(skb).portid);
8481 if (IS_ERR(table)) {
8482 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8483 return PTR_ERR(table);
8486 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8488 if (IS_ERR(flowtable)) {
8489 err = PTR_ERR(flowtable);
8490 if (err != -ENOENT) {
8491 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8495 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8496 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8500 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8502 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8505 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8507 if (!nft_use_inc(&table->use))
8510 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8513 goto flowtable_alloc;
8516 flowtable->table = table;
8517 flowtable->handle = nf_tables_alloc_handle(table);
8518 INIT_LIST_HEAD(&flowtable->hook_list);
8520 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8521 if (!flowtable->name) {
8526 type = nft_flowtable_type_get(net, family);
8528 err = PTR_ERR(type);
8532 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8533 flowtable->data.flags =
8534 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8535 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8541 write_pnet(&flowtable->data.net, net);
8542 flowtable->data.type = type;
8543 err = type->init(&flowtable->data);
8547 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8550 goto err_flowtable_parse_hooks;
8552 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8553 flowtable->data.priority = flowtable_hook.priority;
8554 flowtable->hooknum = flowtable_hook.num;
8556 trans = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8557 if (IS_ERR(trans)) {
8558 err = PTR_ERR(trans);
8559 goto err_flowtable_trans;
8562 /* This must be LAST to ensure no packets are walking over this flowtable. */
8563 err = nft_register_flowtable_net_hooks(ctx.net, table,
8564 &flowtable->hook_list,
8567 goto err_flowtable_hooks;
8569 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8573 err_flowtable_hooks:
8574 nft_trans_destroy(trans);
8575 err_flowtable_trans:
8576 nft_hooks_destroy(&flowtable->hook_list);
8577 err_flowtable_parse_hooks:
8578 flowtable->data.type->free(&flowtable->data);
8580 module_put(type->owner);
8582 kfree(flowtable->name);
8586 nft_use_dec_restore(&table->use);
8591 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8593 struct nft_hook *this, *next;
8595 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8596 list_del(&this->list);
8601 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8602 struct nft_flowtable *flowtable,
8603 struct netlink_ext_ack *extack)
8605 const struct nlattr * const *nla = ctx->nla;
8606 struct nft_flowtable_hook flowtable_hook;
8607 LIST_HEAD(flowtable_del_list);
8608 struct nft_hook *this, *hook;
8609 struct nft_trans *trans;
8612 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8617 list_for_each_entry(this, &flowtable_hook.list, list) {
8618 hook = nft_hook_list_find(&flowtable->hook_list, this);
8621 goto err_flowtable_del_hook;
8623 list_move(&hook->list, &flowtable_del_list);
8626 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8627 sizeof(struct nft_trans_flowtable));
8630 goto err_flowtable_del_hook;
8633 nft_trans_flowtable(trans) = flowtable;
8634 nft_trans_flowtable_update(trans) = true;
8635 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8636 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8637 nft_flowtable_hook_release(&flowtable_hook);
8639 nft_trans_commit_list_add_tail(ctx->net, trans);
8643 err_flowtable_del_hook:
8644 list_splice(&flowtable_del_list, &flowtable->hook_list);
8645 nft_flowtable_hook_release(&flowtable_hook);
8650 static int nf_tables_delflowtable(struct sk_buff *skb,
8651 const struct nfnl_info *info,
8652 const struct nlattr * const nla[])
8654 struct netlink_ext_ack *extack = info->extack;
8655 u8 genmask = nft_genmask_next(info->net);
8656 u8 family = info->nfmsg->nfgen_family;
8657 struct nft_flowtable *flowtable;
8658 struct net *net = info->net;
8659 const struct nlattr *attr;
8660 struct nft_table *table;
8663 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8664 (!nla[NFTA_FLOWTABLE_NAME] &&
8665 !nla[NFTA_FLOWTABLE_HANDLE]))
8668 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8669 genmask, NETLINK_CB(skb).portid);
8670 if (IS_ERR(table)) {
8671 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8672 return PTR_ERR(table);
8675 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8676 attr = nla[NFTA_FLOWTABLE_HANDLE];
8677 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8679 attr = nla[NFTA_FLOWTABLE_NAME];
8680 flowtable = nft_flowtable_lookup(table, attr, genmask);
8683 if (IS_ERR(flowtable)) {
8684 if (PTR_ERR(flowtable) == -ENOENT &&
8685 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8688 NL_SET_BAD_ATTR(extack, attr);
8689 return PTR_ERR(flowtable);
8692 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8694 if (nla[NFTA_FLOWTABLE_HOOK])
8695 return nft_delflowtable_hook(&ctx, flowtable, extack);
8697 if (flowtable->use > 0) {
8698 NL_SET_BAD_ATTR(extack, attr);
8702 return nft_delflowtable(&ctx, flowtable);
8705 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8706 u32 portid, u32 seq, int event,
8707 u32 flags, int family,
8708 struct nft_flowtable *flowtable,
8709 struct list_head *hook_list)
8711 struct nlattr *nest, *nest_devs;
8712 struct nft_hook *hook;
8713 struct nlmsghdr *nlh;
8715 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8716 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8717 NFNETLINK_V0, nft_base_seq(net));
8719 goto nla_put_failure;
8721 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8722 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8723 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8724 NFTA_FLOWTABLE_PAD))
8725 goto nla_put_failure;
8727 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8728 nlmsg_end(skb, nlh);
8732 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8733 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8734 goto nla_put_failure;
8736 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8738 goto nla_put_failure;
8739 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8740 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8741 goto nla_put_failure;
8743 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8745 goto nla_put_failure;
8748 hook_list = &flowtable->hook_list;
8750 list_for_each_entry_rcu(hook, hook_list, list) {
8751 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8752 goto nla_put_failure;
8754 nla_nest_end(skb, nest_devs);
8755 nla_nest_end(skb, nest);
8757 nlmsg_end(skb, nlh);
8761 nlmsg_trim(skb, nlh);
8765 struct nft_flowtable_filter {
8769 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8770 struct netlink_callback *cb)
8772 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8773 struct nft_flowtable_filter *filter = cb->data;
8774 unsigned int idx = 0, s_idx = cb->args[0];
8775 struct net *net = sock_net(skb->sk);
8776 int family = nfmsg->nfgen_family;
8777 struct nft_flowtable *flowtable;
8778 struct nftables_pernet *nft_net;
8779 const struct nft_table *table;
8782 nft_net = nft_pernet(net);
8783 cb->seq = READ_ONCE(nft_net->base_seq);
8785 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8786 if (family != NFPROTO_UNSPEC && family != table->family)
8789 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8790 if (!nft_is_active(net, flowtable))
8795 memset(&cb->args[1], 0,
8796 sizeof(cb->args) - sizeof(cb->args[0]));
8797 if (filter && filter->table &&
8798 strcmp(filter->table, table->name))
8801 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8803 NFT_MSG_NEWFLOWTABLE,
8804 NLM_F_MULTI | NLM_F_APPEND,
8806 flowtable, NULL) < 0)
8809 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8821 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8823 const struct nlattr * const *nla = cb->data;
8824 struct nft_flowtable_filter *filter = NULL;
8826 if (nla[NFTA_FLOWTABLE_TABLE]) {
8827 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8831 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8833 if (!filter->table) {
8843 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8845 struct nft_flowtable_filter *filter = cb->data;
8850 kfree(filter->table);
8856 /* called with rcu_read_lock held */
8857 static int nf_tables_getflowtable(struct sk_buff *skb,
8858 const struct nfnl_info *info,
8859 const struct nlattr * const nla[])
8861 struct netlink_ext_ack *extack = info->extack;
8862 u8 genmask = nft_genmask_cur(info->net);
8863 u8 family = info->nfmsg->nfgen_family;
8864 struct nft_flowtable *flowtable;
8865 const struct nft_table *table;
8866 struct net *net = info->net;
8867 struct sk_buff *skb2;
8870 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8871 struct netlink_dump_control c = {
8872 .start = nf_tables_dump_flowtable_start,
8873 .dump = nf_tables_dump_flowtable,
8874 .done = nf_tables_dump_flowtable_done,
8875 .module = THIS_MODULE,
8876 .data = (void *)nla,
8879 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8882 if (!nla[NFTA_FLOWTABLE_NAME])
8885 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8887 if (IS_ERR(table)) {
8888 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8889 return PTR_ERR(table);
8892 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8894 if (IS_ERR(flowtable)) {
8895 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8896 return PTR_ERR(flowtable);
8899 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8903 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8904 info->nlh->nlmsg_seq,
8905 NFT_MSG_NEWFLOWTABLE, 0, family,
8908 goto err_fill_flowtable_info;
8910 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8912 err_fill_flowtable_info:
8917 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8918 struct nft_flowtable *flowtable,
8919 struct list_head *hook_list, int event)
8921 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8922 struct sk_buff *skb;
8927 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8930 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8934 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8935 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8937 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8938 ctx->seq, event, flags,
8939 ctx->family, flowtable, hook_list);
8945 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8948 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8951 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8953 struct nft_hook *hook, *next;
8955 flowtable->data.type->free(&flowtable->data);
8956 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8957 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8959 list_del_rcu(&hook->list);
8962 kfree(flowtable->name);
8963 module_put(flowtable->data.type->owner);
8967 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8968 u32 portid, u32 seq)
8970 struct nftables_pernet *nft_net = nft_pernet(net);
8971 struct nlmsghdr *nlh;
8972 char buf[TASK_COMM_LEN];
8973 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8975 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8976 NFNETLINK_V0, nft_base_seq(net));
8978 goto nla_put_failure;
8980 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8981 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8982 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8983 goto nla_put_failure;
8985 nlmsg_end(skb, nlh);
8989 nlmsg_trim(skb, nlh);
8993 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8994 struct nft_flowtable *flowtable)
8996 struct nft_hook *hook;
8998 list_for_each_entry(hook, &flowtable->hook_list, list) {
8999 if (hook->ops.dev != dev)
9002 /* flow_offload_netdev_event() cleans up entries for us. */
9003 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
9004 list_del_rcu(&hook->list);
9005 kfree_rcu(hook, rcu);
9010 static int nf_tables_flowtable_event(struct notifier_block *this,
9011 unsigned long event, void *ptr)
9013 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
9014 struct nft_flowtable *flowtable;
9015 struct nftables_pernet *nft_net;
9016 struct nft_table *table;
9019 if (event != NETDEV_UNREGISTER)
9023 nft_net = nft_pernet(net);
9024 mutex_lock(&nft_net->commit_mutex);
9025 list_for_each_entry(table, &nft_net->tables, list) {
9026 list_for_each_entry(flowtable, &table->flowtables, list) {
9027 nft_flowtable_event(event, dev, flowtable);
9030 mutex_unlock(&nft_net->commit_mutex);
9035 static struct notifier_block nf_tables_flowtable_notifier = {
9036 .notifier_call = nf_tables_flowtable_event,
9039 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
9042 struct nlmsghdr *nlh = nlmsg_hdr(skb);
9043 struct sk_buff *skb2;
9046 if (!nlmsg_report(nlh) &&
9047 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
9050 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
9054 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
9061 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9062 nlmsg_report(nlh), GFP_KERNEL);
9065 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
9069 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
9070 const struct nlattr * const nla[])
9072 struct sk_buff *skb2;
9075 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
9079 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
9080 info->nlh->nlmsg_seq);
9082 goto err_fill_gen_info;
9084 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
9091 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
9092 [NFT_MSG_NEWTABLE] = {
9093 .call = nf_tables_newtable,
9094 .type = NFNL_CB_BATCH,
9095 .attr_count = NFTA_TABLE_MAX,
9096 .policy = nft_table_policy,
9098 [NFT_MSG_GETTABLE] = {
9099 .call = nf_tables_gettable,
9100 .type = NFNL_CB_RCU,
9101 .attr_count = NFTA_TABLE_MAX,
9102 .policy = nft_table_policy,
9104 [NFT_MSG_DELTABLE] = {
9105 .call = nf_tables_deltable,
9106 .type = NFNL_CB_BATCH,
9107 .attr_count = NFTA_TABLE_MAX,
9108 .policy = nft_table_policy,
9110 [NFT_MSG_DESTROYTABLE] = {
9111 .call = nf_tables_deltable,
9112 .type = NFNL_CB_BATCH,
9113 .attr_count = NFTA_TABLE_MAX,
9114 .policy = nft_table_policy,
9116 [NFT_MSG_NEWCHAIN] = {
9117 .call = nf_tables_newchain,
9118 .type = NFNL_CB_BATCH,
9119 .attr_count = NFTA_CHAIN_MAX,
9120 .policy = nft_chain_policy,
9122 [NFT_MSG_GETCHAIN] = {
9123 .call = nf_tables_getchain,
9124 .type = NFNL_CB_RCU,
9125 .attr_count = NFTA_CHAIN_MAX,
9126 .policy = nft_chain_policy,
9128 [NFT_MSG_DELCHAIN] = {
9129 .call = nf_tables_delchain,
9130 .type = NFNL_CB_BATCH,
9131 .attr_count = NFTA_CHAIN_MAX,
9132 .policy = nft_chain_policy,
9134 [NFT_MSG_DESTROYCHAIN] = {
9135 .call = nf_tables_delchain,
9136 .type = NFNL_CB_BATCH,
9137 .attr_count = NFTA_CHAIN_MAX,
9138 .policy = nft_chain_policy,
9140 [NFT_MSG_NEWRULE] = {
9141 .call = nf_tables_newrule,
9142 .type = NFNL_CB_BATCH,
9143 .attr_count = NFTA_RULE_MAX,
9144 .policy = nft_rule_policy,
9146 [NFT_MSG_GETRULE] = {
9147 .call = nf_tables_getrule,
9148 .type = NFNL_CB_RCU,
9149 .attr_count = NFTA_RULE_MAX,
9150 .policy = nft_rule_policy,
9152 [NFT_MSG_GETRULE_RESET] = {
9153 .call = nf_tables_getrule_reset,
9154 .type = NFNL_CB_RCU,
9155 .attr_count = NFTA_RULE_MAX,
9156 .policy = nft_rule_policy,
9158 [NFT_MSG_DELRULE] = {
9159 .call = nf_tables_delrule,
9160 .type = NFNL_CB_BATCH,
9161 .attr_count = NFTA_RULE_MAX,
9162 .policy = nft_rule_policy,
9164 [NFT_MSG_DESTROYRULE] = {
9165 .call = nf_tables_delrule,
9166 .type = NFNL_CB_BATCH,
9167 .attr_count = NFTA_RULE_MAX,
9168 .policy = nft_rule_policy,
9170 [NFT_MSG_NEWSET] = {
9171 .call = nf_tables_newset,
9172 .type = NFNL_CB_BATCH,
9173 .attr_count = NFTA_SET_MAX,
9174 .policy = nft_set_policy,
9176 [NFT_MSG_GETSET] = {
9177 .call = nf_tables_getset,
9178 .type = NFNL_CB_RCU,
9179 .attr_count = NFTA_SET_MAX,
9180 .policy = nft_set_policy,
9182 [NFT_MSG_DELSET] = {
9183 .call = nf_tables_delset,
9184 .type = NFNL_CB_BATCH,
9185 .attr_count = NFTA_SET_MAX,
9186 .policy = nft_set_policy,
9188 [NFT_MSG_DESTROYSET] = {
9189 .call = nf_tables_delset,
9190 .type = NFNL_CB_BATCH,
9191 .attr_count = NFTA_SET_MAX,
9192 .policy = nft_set_policy,
9194 [NFT_MSG_NEWSETELEM] = {
9195 .call = nf_tables_newsetelem,
9196 .type = NFNL_CB_BATCH,
9197 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9198 .policy = nft_set_elem_list_policy,
9200 [NFT_MSG_GETSETELEM] = {
9201 .call = nf_tables_getsetelem,
9202 .type = NFNL_CB_RCU,
9203 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9204 .policy = nft_set_elem_list_policy,
9206 [NFT_MSG_GETSETELEM_RESET] = {
9207 .call = nf_tables_getsetelem_reset,
9208 .type = NFNL_CB_RCU,
9209 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9210 .policy = nft_set_elem_list_policy,
9212 [NFT_MSG_DELSETELEM] = {
9213 .call = nf_tables_delsetelem,
9214 .type = NFNL_CB_BATCH,
9215 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9216 .policy = nft_set_elem_list_policy,
9218 [NFT_MSG_DESTROYSETELEM] = {
9219 .call = nf_tables_delsetelem,
9220 .type = NFNL_CB_BATCH,
9221 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9222 .policy = nft_set_elem_list_policy,
9224 [NFT_MSG_GETGEN] = {
9225 .call = nf_tables_getgen,
9226 .type = NFNL_CB_RCU,
9228 [NFT_MSG_NEWOBJ] = {
9229 .call = nf_tables_newobj,
9230 .type = NFNL_CB_BATCH,
9231 .attr_count = NFTA_OBJ_MAX,
9232 .policy = nft_obj_policy,
9234 [NFT_MSG_GETOBJ] = {
9235 .call = nf_tables_getobj,
9236 .type = NFNL_CB_RCU,
9237 .attr_count = NFTA_OBJ_MAX,
9238 .policy = nft_obj_policy,
9240 [NFT_MSG_DELOBJ] = {
9241 .call = nf_tables_delobj,
9242 .type = NFNL_CB_BATCH,
9243 .attr_count = NFTA_OBJ_MAX,
9244 .policy = nft_obj_policy,
9246 [NFT_MSG_DESTROYOBJ] = {
9247 .call = nf_tables_delobj,
9248 .type = NFNL_CB_BATCH,
9249 .attr_count = NFTA_OBJ_MAX,
9250 .policy = nft_obj_policy,
9252 [NFT_MSG_GETOBJ_RESET] = {
9253 .call = nf_tables_getobj,
9254 .type = NFNL_CB_RCU,
9255 .attr_count = NFTA_OBJ_MAX,
9256 .policy = nft_obj_policy,
9258 [NFT_MSG_NEWFLOWTABLE] = {
9259 .call = nf_tables_newflowtable,
9260 .type = NFNL_CB_BATCH,
9261 .attr_count = NFTA_FLOWTABLE_MAX,
9262 .policy = nft_flowtable_policy,
9264 [NFT_MSG_GETFLOWTABLE] = {
9265 .call = nf_tables_getflowtable,
9266 .type = NFNL_CB_RCU,
9267 .attr_count = NFTA_FLOWTABLE_MAX,
9268 .policy = nft_flowtable_policy,
9270 [NFT_MSG_DELFLOWTABLE] = {
9271 .call = nf_tables_delflowtable,
9272 .type = NFNL_CB_BATCH,
9273 .attr_count = NFTA_FLOWTABLE_MAX,
9274 .policy = nft_flowtable_policy,
9276 [NFT_MSG_DESTROYFLOWTABLE] = {
9277 .call = nf_tables_delflowtable,
9278 .type = NFNL_CB_BATCH,
9279 .attr_count = NFTA_FLOWTABLE_MAX,
9280 .policy = nft_flowtable_policy,
9284 static int nf_tables_validate(struct net *net)
9286 struct nftables_pernet *nft_net = nft_pernet(net);
9287 struct nft_table *table;
9289 list_for_each_entry(table, &nft_net->tables, list) {
9290 switch (table->validate_state) {
9291 case NFT_VALIDATE_SKIP:
9293 case NFT_VALIDATE_NEED:
9294 nft_validate_state_update(table, NFT_VALIDATE_DO);
9296 case NFT_VALIDATE_DO:
9297 if (nft_table_validate(net, table) < 0)
9300 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9308 /* a drop policy has to be deferred until all rules have been activated,
9309 * otherwise a large ruleset that contains a drop-policy base chain will
9310 * cause all packets to get dropped until the full transaction has been
9313 * We defer the drop policy until the transaction has been finalized.
9315 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9317 struct nft_base_chain *basechain;
9319 if (nft_trans_chain_policy(trans) != NF_DROP)
9322 if (!nft_is_base_chain(trans->ctx.chain))
9325 basechain = nft_base_chain(trans->ctx.chain);
9326 basechain->policy = NF_DROP;
9329 static void nft_chain_commit_update(struct nft_trans *trans)
9331 struct nft_base_chain *basechain;
9333 if (nft_trans_chain_name(trans)) {
9334 rhltable_remove(&trans->ctx.table->chains_ht,
9335 &trans->ctx.chain->rhlhead,
9336 nft_chain_ht_params);
9337 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9338 rhltable_insert_key(&trans->ctx.table->chains_ht,
9339 trans->ctx.chain->name,
9340 &trans->ctx.chain->rhlhead,
9341 nft_chain_ht_params);
9344 if (!nft_is_base_chain(trans->ctx.chain))
9347 nft_chain_stats_replace(trans);
9349 basechain = nft_base_chain(trans->ctx.chain);
9351 switch (nft_trans_chain_policy(trans)) {
9354 basechain->policy = nft_trans_chain_policy(trans);
9359 static void nft_obj_commit_update(struct nft_trans *trans)
9361 struct nft_object *newobj;
9362 struct nft_object *obj;
9364 obj = nft_trans_obj(trans);
9365 newobj = nft_trans_obj_newobj(trans);
9367 if (obj->ops->update)
9368 obj->ops->update(obj, newobj);
9370 nft_obj_destroy(&trans->ctx, newobj);
9373 static void nft_commit_release(struct nft_trans *trans)
9375 switch (trans->msg_type) {
9376 case NFT_MSG_DELTABLE:
9377 case NFT_MSG_DESTROYTABLE:
9378 nf_tables_table_destroy(&trans->ctx);
9380 case NFT_MSG_NEWCHAIN:
9381 free_percpu(nft_trans_chain_stats(trans));
9382 kfree(nft_trans_chain_name(trans));
9384 case NFT_MSG_DELCHAIN:
9385 case NFT_MSG_DESTROYCHAIN:
9386 if (nft_trans_chain_update(trans))
9387 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9389 nf_tables_chain_destroy(&trans->ctx);
9391 case NFT_MSG_DELRULE:
9392 case NFT_MSG_DESTROYRULE:
9393 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9395 case NFT_MSG_DELSET:
9396 case NFT_MSG_DESTROYSET:
9397 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9399 case NFT_MSG_DELSETELEM:
9400 case NFT_MSG_DESTROYSETELEM:
9401 nf_tables_set_elem_destroy(&trans->ctx,
9402 nft_trans_elem_set(trans),
9403 nft_trans_elem_priv(trans));
9405 case NFT_MSG_DELOBJ:
9406 case NFT_MSG_DESTROYOBJ:
9407 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9409 case NFT_MSG_DELFLOWTABLE:
9410 case NFT_MSG_DESTROYFLOWTABLE:
9411 if (nft_trans_flowtable_update(trans))
9412 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9414 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9419 put_net(trans->ctx.net);
9424 static void nf_tables_trans_destroy_work(struct work_struct *w)
9426 struct nft_trans *trans, *next;
9429 spin_lock(&nf_tables_destroy_list_lock);
9430 list_splice_init(&nf_tables_destroy_list, &head);
9431 spin_unlock(&nf_tables_destroy_list_lock);
9433 if (list_empty(&head))
9438 list_for_each_entry_safe(trans, next, &head, list) {
9439 nft_trans_list_del(trans);
9440 nft_commit_release(trans);
9444 void nf_tables_trans_destroy_flush_work(void)
9446 flush_work(&trans_destroy_work);
9448 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9450 static bool nft_expr_reduce(struct nft_regs_track *track,
9451 const struct nft_expr *expr)
9456 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9458 const struct nft_expr *expr, *last;
9459 struct nft_regs_track track = {};
9460 unsigned int size, data_size;
9461 void *data, *data_boundary;
9462 struct nft_rule_dp *prule;
9463 struct nft_rule *rule;
9465 /* already handled or inactive chain? */
9466 if (chain->blob_next || !nft_is_active_next(net, chain))
9470 list_for_each_entry(rule, &chain->rules, list) {
9471 if (nft_is_active_next(net, rule)) {
9472 data_size += sizeof(*prule) + rule->dlen;
9473 if (data_size > INT_MAX)
9478 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9479 if (!chain->blob_next)
9482 data = (void *)chain->blob_next->data;
9483 data_boundary = data + data_size;
9486 list_for_each_entry(rule, &chain->rules, list) {
9487 if (!nft_is_active_next(net, rule))
9490 prule = (struct nft_rule_dp *)data;
9491 data += offsetof(struct nft_rule_dp, data);
9492 if (WARN_ON_ONCE(data > data_boundary))
9496 track.last = nft_expr_last(rule);
9497 nft_rule_for_each_expr(expr, last, rule) {
9500 if (nft_expr_reduce(&track, expr)) {
9505 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9508 memcpy(data + size, expr, expr->ops->size);
9509 size += expr->ops->size;
9511 if (WARN_ON_ONCE(size >= 1 << 12))
9514 prule->handle = rule->handle;
9520 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9523 if (WARN_ON_ONCE(data > data_boundary))
9526 prule = (struct nft_rule_dp *)data;
9527 nft_last_rule(chain, prule);
9532 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9534 struct nftables_pernet *nft_net = nft_pernet(net);
9535 struct nft_trans *trans, *next;
9537 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9538 struct nft_chain *chain = trans->ctx.chain;
9540 if (trans->msg_type == NFT_MSG_NEWRULE ||
9541 trans->msg_type == NFT_MSG_DELRULE) {
9542 kvfree(chain->blob_next);
9543 chain->blob_next = NULL;
9548 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9550 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9555 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9557 struct nft_rule_dp_last *last;
9559 /* last rule trailer is after end marker */
9560 last = (void *)blob + sizeof(*blob) + blob->size;
9563 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9566 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9568 struct nft_rule_blob *g0, *g1;
9571 next_genbit = nft_gencursor_next(net);
9573 g0 = rcu_dereference_protected(chain->blob_gen_0,
9574 lockdep_commit_lock_is_held(net));
9575 g1 = rcu_dereference_protected(chain->blob_gen_1,
9576 lockdep_commit_lock_is_held(net));
9578 /* No changes to this chain? */
9579 if (chain->blob_next == NULL) {
9580 /* chain had no change in last or next generation */
9584 * chain had no change in this generation; make sure next
9585 * one uses same rules as current generation.
9588 rcu_assign_pointer(chain->blob_gen_1, g0);
9589 nf_tables_commit_chain_free_rules_old(g1);
9591 rcu_assign_pointer(chain->blob_gen_0, g1);
9592 nf_tables_commit_chain_free_rules_old(g0);
9599 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9601 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9603 chain->blob_next = NULL;
9609 nf_tables_commit_chain_free_rules_old(g1);
9611 nf_tables_commit_chain_free_rules_old(g0);
9614 static void nft_obj_del(struct nft_object *obj)
9616 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9617 list_del_rcu(&obj->list);
9620 void nft_chain_del(struct nft_chain *chain)
9622 struct nft_table *table = chain->table;
9624 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9625 nft_chain_ht_params));
9626 list_del_rcu(&chain->list);
9629 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9630 struct nft_trans_gc *trans)
9632 struct nft_elem_priv **priv = trans->priv;
9635 for (i = 0; i < trans->count; i++) {
9636 nft_setelem_data_deactivate(ctx->net, trans->set, priv[i]);
9637 nft_setelem_remove(ctx->net, trans->set, priv[i]);
9641 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9643 nft_set_put(trans->set);
9644 put_net(trans->net);
9648 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9650 struct nft_elem_priv *elem_priv;
9651 struct nft_trans_gc *trans;
9652 struct nft_ctx ctx = {};
9655 trans = container_of(rcu, struct nft_trans_gc, rcu);
9656 ctx.net = read_pnet(&trans->set->net);
9658 for (i = 0; i < trans->count; i++) {
9659 elem_priv = trans->priv[i];
9660 if (!nft_setelem_is_catchall(trans->set, elem_priv))
9661 atomic_dec(&trans->set->nelems);
9663 nf_tables_set_elem_destroy(&ctx, trans->set, elem_priv);
9666 nft_trans_gc_destroy(trans);
9669 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9671 struct nftables_pernet *nft_net;
9672 struct nft_ctx ctx = {};
9674 nft_net = nft_pernet(trans->net);
9676 mutex_lock(&nft_net->commit_mutex);
9678 /* Check for race with transaction, otherwise this batch refers to
9679 * stale objects that might not be there anymore. Skip transaction if
9680 * set has been destroyed from control plane transaction in case gc
9681 * worker loses race.
9683 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9684 mutex_unlock(&nft_net->commit_mutex);
9688 ctx.net = trans->net;
9689 ctx.table = trans->set->table;
9691 nft_trans_gc_setelem_remove(&ctx, trans);
9692 mutex_unlock(&nft_net->commit_mutex);
9697 static void nft_trans_gc_work(struct work_struct *work)
9699 struct nft_trans_gc *trans, *next;
9700 LIST_HEAD(trans_gc_list);
9702 spin_lock(&nf_tables_gc_list_lock);
9703 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9704 spin_unlock(&nf_tables_gc_list_lock);
9706 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9707 list_del(&trans->list);
9708 if (!nft_trans_gc_work_done(trans)) {
9709 nft_trans_gc_destroy(trans);
9712 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9716 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9717 unsigned int gc_seq, gfp_t gfp)
9719 struct net *net = read_pnet(&set->net);
9720 struct nft_trans_gc *trans;
9722 trans = kzalloc(sizeof(*trans), gfp);
9726 trans->net = maybe_get_net(net);
9732 refcount_inc(&set->refs);
9734 trans->seq = gc_seq;
9739 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9741 trans->priv[trans->count++] = priv;
9744 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9746 spin_lock(&nf_tables_gc_list_lock);
9747 list_add_tail(&trans->list, &nf_tables_gc_list);
9748 spin_unlock(&nf_tables_gc_list_lock);
9750 schedule_work(&trans_gc_work);
9753 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9755 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9758 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9759 unsigned int gc_seq, gfp_t gfp)
9761 struct nft_set *set;
9763 if (nft_trans_gc_space(gc))
9767 nft_trans_gc_queue_work(gc);
9769 return nft_trans_gc_alloc(set, gc_seq, gfp);
9772 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9774 if (trans->count == 0) {
9775 nft_trans_gc_destroy(trans);
9779 nft_trans_gc_queue_work(trans);
9782 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9784 struct nft_set *set;
9786 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9789 if (nft_trans_gc_space(gc))
9793 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9795 return nft_trans_gc_alloc(set, 0, gfp);
9798 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9800 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9802 if (trans->count == 0) {
9803 nft_trans_gc_destroy(trans);
9807 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9810 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9811 unsigned int gc_seq)
9813 struct nft_set_elem_catchall *catchall;
9814 const struct nft_set *set = gc->set;
9815 struct nft_set_ext *ext;
9817 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9818 ext = nft_set_elem_ext(set, catchall->elem);
9820 if (!nft_set_elem_expired(ext))
9822 if (nft_set_elem_is_dead(ext))
9825 nft_set_elem_dead(ext);
9827 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9831 nft_trans_gc_elem_add(gc, catchall->elem);
9837 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9839 struct nft_set_elem_catchall *catchall, *next;
9840 u64 tstamp = nft_net_tstamp(gc->net);
9841 const struct nft_set *set = gc->set;
9842 struct nft_elem_priv *elem_priv;
9843 struct nft_set_ext *ext;
9845 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9847 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9848 ext = nft_set_elem_ext(set, catchall->elem);
9850 if (!__nft_set_elem_expired(ext, tstamp))
9853 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9857 elem_priv = catchall->elem;
9858 nft_setelem_data_deactivate(gc->net, gc->set, elem_priv);
9859 nft_setelem_catchall_destroy(catchall);
9860 nft_trans_gc_elem_add(gc, elem_priv);
9866 static void nf_tables_module_autoload_cleanup(struct net *net)
9868 struct nftables_pernet *nft_net = nft_pernet(net);
9869 struct nft_module_request *req, *next;
9871 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9872 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9873 WARN_ON_ONCE(!req->done);
9874 list_del(&req->list);
9879 static void nf_tables_commit_release(struct net *net)
9881 struct nftables_pernet *nft_net = nft_pernet(net);
9882 struct nft_trans *trans;
9884 /* all side effects have to be made visible.
9885 * For example, if a chain named 'foo' has been deleted, a
9886 * new transaction must not find it anymore.
9888 * Memory reclaim happens asynchronously from work queue
9889 * to prevent expensive synchronize_rcu() in commit phase.
9891 if (list_empty(&nft_net->commit_list)) {
9892 nf_tables_module_autoload_cleanup(net);
9893 mutex_unlock(&nft_net->commit_mutex);
9897 trans = list_last_entry(&nft_net->commit_list,
9898 struct nft_trans, list);
9899 get_net(trans->ctx.net);
9900 WARN_ON_ONCE(trans->put_net);
9902 trans->put_net = true;
9903 spin_lock(&nf_tables_destroy_list_lock);
9904 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9905 spin_unlock(&nf_tables_destroy_list_lock);
9907 nf_tables_module_autoload_cleanup(net);
9908 schedule_work(&trans_destroy_work);
9910 mutex_unlock(&nft_net->commit_mutex);
9913 static void nft_commit_notify(struct net *net, u32 portid)
9915 struct nftables_pernet *nft_net = nft_pernet(net);
9916 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9917 unsigned char *data;
9920 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9924 len = NLMSG_GOODSIZE - skb->len;
9925 list_del(&skb->list);
9929 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9930 data = skb_put(batch_skb, skb->len);
9931 memcpy(data, skb->data, skb->len);
9932 list_del(&skb->list);
9936 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9937 NFT_CB(batch_skb).report, GFP_KERNEL);
9942 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9943 NFT_CB(batch_skb).report, GFP_KERNEL);
9946 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9949 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9950 struct nft_table *table)
9952 struct nft_audit_data *adp;
9954 list_for_each_entry(adp, adl, list) {
9955 if (adp->table == table)
9958 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9962 list_add(&adp->list, adl);
9966 static void nf_tables_commit_audit_free(struct list_head *adl)
9968 struct nft_audit_data *adp, *adn;
9970 list_for_each_entry_safe(adp, adn, adl, list) {
9971 list_del(&adp->list);
9976 static void nf_tables_commit_audit_collect(struct list_head *adl,
9977 struct nft_table *table, u32 op)
9979 struct nft_audit_data *adp;
9981 list_for_each_entry(adp, adl, list) {
9982 if (adp->table == table)
9985 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9989 if (!adp->op || adp->op > op)
9993 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9995 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9997 struct nft_audit_data *adp, *adn;
9998 char aubuf[AUNFTABLENAMELEN];
10000 list_for_each_entry_safe(adp, adn, adl, list) {
10001 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
10003 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
10004 nft2audit_op[adp->op], GFP_KERNEL);
10005 list_del(&adp->list);
10010 static void nft_set_commit_update(struct list_head *set_update_list)
10012 struct nft_set *set, *next;
10014 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10015 list_del_init(&set->pending_update);
10017 if (!set->ops->commit || set->dead)
10020 set->ops->commit(set);
10024 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
10026 unsigned int gc_seq;
10028 /* Bump gc counter, it becomes odd, this is the busy mark. */
10029 gc_seq = READ_ONCE(nft_net->gc_seq);
10030 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10035 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
10037 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
10040 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
10042 struct nftables_pernet *nft_net = nft_pernet(net);
10043 struct nft_trans *trans, *next;
10044 unsigned int base_seq, gc_seq;
10045 LIST_HEAD(set_update_list);
10046 struct nft_trans_elem *te;
10047 struct nft_chain *chain;
10048 struct nft_table *table;
10052 if (list_empty(&nft_net->commit_list)) {
10053 mutex_unlock(&nft_net->commit_mutex);
10057 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
10058 switch (trans->msg_type) {
10059 case NFT_MSG_NEWSET:
10060 if (!nft_trans_set_update(trans) &&
10061 nft_set_is_anonymous(nft_trans_set(trans)) &&
10062 !nft_trans_set_bound(trans)) {
10063 pr_warn_once("nftables ruleset with unbound set\n");
10067 case NFT_MSG_NEWCHAIN:
10068 if (!nft_trans_chain_update(trans) &&
10069 nft_chain_binding(nft_trans_chain(trans)) &&
10070 !nft_trans_chain_bound(trans)) {
10071 pr_warn_once("nftables ruleset with unbound chain\n");
10078 /* 0. Validate ruleset, otherwise roll back for error reporting. */
10079 if (nf_tables_validate(net) < 0) {
10080 nft_net->validate_state = NFT_VALIDATE_DO;
10084 err = nft_flow_rule_offload_commit(net);
10088 /* 1. Allocate space for next generation rules_gen_X[] */
10089 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10092 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
10094 nf_tables_commit_chain_prepare_cancel(net);
10095 nf_tables_commit_audit_free(&adl);
10098 if (trans->msg_type == NFT_MSG_NEWRULE ||
10099 trans->msg_type == NFT_MSG_DELRULE) {
10100 chain = trans->ctx.chain;
10102 ret = nf_tables_commit_chain_prepare(net, chain);
10104 nf_tables_commit_chain_prepare_cancel(net);
10105 nf_tables_commit_audit_free(&adl);
10111 /* step 2. Make rules_gen_X visible to packet path */
10112 list_for_each_entry(table, &nft_net->tables, list) {
10113 list_for_each_entry(chain, &table->chains, list)
10114 nf_tables_commit_chain(net, chain);
10118 * Bump generation counter, invalidate any dump in progress.
10119 * Cannot fail after this point.
10121 base_seq = READ_ONCE(nft_net->base_seq);
10122 while (++base_seq == 0)
10125 WRITE_ONCE(nft_net->base_seq, base_seq);
10127 gc_seq = nft_gc_seq_begin(nft_net);
10129 /* step 3. Start new generation, rules_gen_X now in use. */
10130 net->nft.gencursor = nft_gencursor_next(net);
10132 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
10133 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
10135 switch (trans->msg_type) {
10136 case NFT_MSG_NEWTABLE:
10137 if (nft_trans_table_update(trans)) {
10138 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10139 nft_trans_destroy(trans);
10142 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
10143 nf_tables_table_disable(net, trans->ctx.table);
10145 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10147 nft_clear(net, trans->ctx.table);
10149 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10150 nft_trans_destroy(trans);
10152 case NFT_MSG_DELTABLE:
10153 case NFT_MSG_DESTROYTABLE:
10154 list_del_rcu(&trans->ctx.table->list);
10155 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10157 case NFT_MSG_NEWCHAIN:
10158 if (nft_trans_chain_update(trans)) {
10159 nft_chain_commit_update(trans);
10160 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10161 &nft_trans_chain_hooks(trans));
10162 list_splice(&nft_trans_chain_hooks(trans),
10163 &nft_trans_basechain(trans)->hook_list);
10164 /* trans destroyed after rcu grace period */
10166 nft_chain_commit_drop_policy(trans);
10167 nft_clear(net, trans->ctx.chain);
10168 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10169 nft_trans_destroy(trans);
10172 case NFT_MSG_DELCHAIN:
10173 case NFT_MSG_DESTROYCHAIN:
10174 if (nft_trans_chain_update(trans)) {
10175 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10176 &nft_trans_chain_hooks(trans));
10177 nft_netdev_unregister_hooks(net,
10178 &nft_trans_chain_hooks(trans),
10181 nft_chain_del(trans->ctx.chain);
10182 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10184 nf_tables_unregister_hook(trans->ctx.net,
10189 case NFT_MSG_NEWRULE:
10190 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10191 nf_tables_rule_notify(&trans->ctx,
10192 nft_trans_rule(trans),
10194 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10195 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10197 nft_trans_destroy(trans);
10199 case NFT_MSG_DELRULE:
10200 case NFT_MSG_DESTROYRULE:
10201 list_del_rcu(&nft_trans_rule(trans)->list);
10202 nf_tables_rule_notify(&trans->ctx,
10203 nft_trans_rule(trans),
10205 nft_rule_expr_deactivate(&trans->ctx,
10206 nft_trans_rule(trans),
10209 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10210 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10212 case NFT_MSG_NEWSET:
10213 if (nft_trans_set_update(trans)) {
10214 struct nft_set *set = nft_trans_set(trans);
10216 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10217 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10219 if (nft_trans_set_size(trans))
10220 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10222 nft_clear(net, nft_trans_set(trans));
10223 /* This avoids hitting -EBUSY when deleting the table
10224 * from the transaction.
10226 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10227 !list_empty(&nft_trans_set(trans)->bindings))
10228 nft_use_dec(&trans->ctx.table->use);
10230 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10231 NFT_MSG_NEWSET, GFP_KERNEL);
10232 nft_trans_destroy(trans);
10234 case NFT_MSG_DELSET:
10235 case NFT_MSG_DESTROYSET:
10236 nft_trans_set(trans)->dead = 1;
10237 list_del_rcu(&nft_trans_set(trans)->list);
10238 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10239 trans->msg_type, GFP_KERNEL);
10241 case NFT_MSG_NEWSETELEM:
10242 te = (struct nft_trans_elem *)trans->data;
10244 nft_setelem_activate(net, te->set, te->elem_priv);
10245 nf_tables_setelem_notify(&trans->ctx, te->set,
10247 NFT_MSG_NEWSETELEM);
10248 if (te->set->ops->commit &&
10249 list_empty(&te->set->pending_update)) {
10250 list_add_tail(&te->set->pending_update,
10253 nft_trans_destroy(trans);
10255 case NFT_MSG_DELSETELEM:
10256 case NFT_MSG_DESTROYSETELEM:
10257 te = (struct nft_trans_elem *)trans->data;
10259 nf_tables_setelem_notify(&trans->ctx, te->set,
10262 nft_setelem_remove(net, te->set, te->elem_priv);
10263 if (!nft_setelem_is_catchall(te->set, te->elem_priv)) {
10264 atomic_dec(&te->set->nelems);
10267 if (te->set->ops->commit &&
10268 list_empty(&te->set->pending_update)) {
10269 list_add_tail(&te->set->pending_update,
10273 case NFT_MSG_NEWOBJ:
10274 if (nft_trans_obj_update(trans)) {
10275 nft_obj_commit_update(trans);
10276 nf_tables_obj_notify(&trans->ctx,
10277 nft_trans_obj(trans),
10280 nft_clear(net, nft_trans_obj(trans));
10281 nf_tables_obj_notify(&trans->ctx,
10282 nft_trans_obj(trans),
10284 nft_trans_destroy(trans);
10287 case NFT_MSG_DELOBJ:
10288 case NFT_MSG_DESTROYOBJ:
10289 nft_obj_del(nft_trans_obj(trans));
10290 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10293 case NFT_MSG_NEWFLOWTABLE:
10294 if (nft_trans_flowtable_update(trans)) {
10295 nft_trans_flowtable(trans)->data.flags =
10296 nft_trans_flowtable_flags(trans);
10297 nf_tables_flowtable_notify(&trans->ctx,
10298 nft_trans_flowtable(trans),
10299 &nft_trans_flowtable_hooks(trans),
10300 NFT_MSG_NEWFLOWTABLE);
10301 list_splice(&nft_trans_flowtable_hooks(trans),
10302 &nft_trans_flowtable(trans)->hook_list);
10304 nft_clear(net, nft_trans_flowtable(trans));
10305 nf_tables_flowtable_notify(&trans->ctx,
10306 nft_trans_flowtable(trans),
10308 NFT_MSG_NEWFLOWTABLE);
10310 nft_trans_destroy(trans);
10312 case NFT_MSG_DELFLOWTABLE:
10313 case NFT_MSG_DESTROYFLOWTABLE:
10314 if (nft_trans_flowtable_update(trans)) {
10315 nf_tables_flowtable_notify(&trans->ctx,
10316 nft_trans_flowtable(trans),
10317 &nft_trans_flowtable_hooks(trans),
10319 nft_unregister_flowtable_net_hooks(net,
10320 &nft_trans_flowtable_hooks(trans));
10322 list_del_rcu(&nft_trans_flowtable(trans)->list);
10323 nf_tables_flowtable_notify(&trans->ctx,
10324 nft_trans_flowtable(trans),
10327 nft_unregister_flowtable_net_hooks(net,
10328 &nft_trans_flowtable(trans)->hook_list);
10334 nft_set_commit_update(&set_update_list);
10336 nft_commit_notify(net, NETLINK_CB(skb).portid);
10337 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10338 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10340 nft_gc_seq_end(nft_net, gc_seq);
10341 nft_net->validate_state = NFT_VALIDATE_SKIP;
10342 nf_tables_commit_release(net);
10347 static void nf_tables_module_autoload(struct net *net)
10349 struct nftables_pernet *nft_net = nft_pernet(net);
10350 struct nft_module_request *req, *next;
10351 LIST_HEAD(module_list);
10353 list_splice_init(&nft_net->module_list, &module_list);
10354 mutex_unlock(&nft_net->commit_mutex);
10355 list_for_each_entry_safe(req, next, &module_list, list) {
10356 request_module("%s", req->module);
10359 mutex_lock(&nft_net->commit_mutex);
10360 list_splice(&module_list, &nft_net->module_list);
10363 static void nf_tables_abort_release(struct nft_trans *trans)
10365 switch (trans->msg_type) {
10366 case NFT_MSG_NEWTABLE:
10367 nf_tables_table_destroy(&trans->ctx);
10369 case NFT_MSG_NEWCHAIN:
10370 if (nft_trans_chain_update(trans))
10371 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10373 nf_tables_chain_destroy(&trans->ctx);
10375 case NFT_MSG_NEWRULE:
10376 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10378 case NFT_MSG_NEWSET:
10379 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10381 case NFT_MSG_NEWSETELEM:
10382 nft_set_elem_destroy(nft_trans_elem_set(trans),
10383 nft_trans_elem_priv(trans), true);
10385 case NFT_MSG_NEWOBJ:
10386 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10388 case NFT_MSG_NEWFLOWTABLE:
10389 if (nft_trans_flowtable_update(trans))
10390 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10392 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10398 static void nft_set_abort_update(struct list_head *set_update_list)
10400 struct nft_set *set, *next;
10402 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10403 list_del_init(&set->pending_update);
10405 if (!set->ops->abort)
10408 set->ops->abort(set);
10412 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10414 struct nftables_pernet *nft_net = nft_pernet(net);
10415 struct nft_trans *trans, *next;
10416 LIST_HEAD(set_update_list);
10417 struct nft_trans_elem *te;
10419 if (action == NFNL_ABORT_VALIDATE &&
10420 nf_tables_validate(net) < 0)
10423 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10425 switch (trans->msg_type) {
10426 case NFT_MSG_NEWTABLE:
10427 if (nft_trans_table_update(trans)) {
10428 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10429 nft_trans_destroy(trans);
10432 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10433 nf_tables_table_disable(net, trans->ctx.table);
10434 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10435 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10436 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10438 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10439 nft_trans_destroy(trans);
10441 list_del_rcu(&trans->ctx.table->list);
10444 case NFT_MSG_DELTABLE:
10445 case NFT_MSG_DESTROYTABLE:
10446 nft_clear(trans->ctx.net, trans->ctx.table);
10447 nft_trans_destroy(trans);
10449 case NFT_MSG_NEWCHAIN:
10450 if (nft_trans_chain_update(trans)) {
10451 nft_netdev_unregister_hooks(net,
10452 &nft_trans_chain_hooks(trans),
10454 free_percpu(nft_trans_chain_stats(trans));
10455 kfree(nft_trans_chain_name(trans));
10456 nft_trans_destroy(trans);
10458 if (nft_trans_chain_bound(trans)) {
10459 nft_trans_destroy(trans);
10462 nft_use_dec_restore(&trans->ctx.table->use);
10463 nft_chain_del(trans->ctx.chain);
10464 nf_tables_unregister_hook(trans->ctx.net,
10469 case NFT_MSG_DELCHAIN:
10470 case NFT_MSG_DESTROYCHAIN:
10471 if (nft_trans_chain_update(trans)) {
10472 list_splice(&nft_trans_chain_hooks(trans),
10473 &nft_trans_basechain(trans)->hook_list);
10475 nft_use_inc_restore(&trans->ctx.table->use);
10476 nft_clear(trans->ctx.net, trans->ctx.chain);
10478 nft_trans_destroy(trans);
10480 case NFT_MSG_NEWRULE:
10481 if (nft_trans_rule_bound(trans)) {
10482 nft_trans_destroy(trans);
10485 nft_use_dec_restore(&trans->ctx.chain->use);
10486 list_del_rcu(&nft_trans_rule(trans)->list);
10487 nft_rule_expr_deactivate(&trans->ctx,
10488 nft_trans_rule(trans),
10490 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10491 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10493 case NFT_MSG_DELRULE:
10494 case NFT_MSG_DESTROYRULE:
10495 nft_use_inc_restore(&trans->ctx.chain->use);
10496 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10497 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10498 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10499 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10501 nft_trans_destroy(trans);
10503 case NFT_MSG_NEWSET:
10504 if (nft_trans_set_update(trans)) {
10505 nft_trans_destroy(trans);
10508 nft_use_dec_restore(&trans->ctx.table->use);
10509 if (nft_trans_set_bound(trans)) {
10510 nft_trans_destroy(trans);
10513 nft_trans_set(trans)->dead = 1;
10514 list_del_rcu(&nft_trans_set(trans)->list);
10516 case NFT_MSG_DELSET:
10517 case NFT_MSG_DESTROYSET:
10518 nft_use_inc_restore(&trans->ctx.table->use);
10519 nft_clear(trans->ctx.net, nft_trans_set(trans));
10520 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10521 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10523 nft_trans_destroy(trans);
10525 case NFT_MSG_NEWSETELEM:
10526 if (nft_trans_elem_set_bound(trans)) {
10527 nft_trans_destroy(trans);
10530 te = (struct nft_trans_elem *)trans->data;
10531 nft_setelem_remove(net, te->set, te->elem_priv);
10532 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10533 atomic_dec(&te->set->nelems);
10535 if (te->set->ops->abort &&
10536 list_empty(&te->set->pending_update)) {
10537 list_add_tail(&te->set->pending_update,
10541 case NFT_MSG_DELSETELEM:
10542 case NFT_MSG_DESTROYSETELEM:
10543 te = (struct nft_trans_elem *)trans->data;
10545 nft_setelem_data_activate(net, te->set, te->elem_priv);
10546 nft_setelem_activate(net, te->set, te->elem_priv);
10547 if (!nft_setelem_is_catchall(te->set, te->elem_priv))
10550 if (te->set->ops->abort &&
10551 list_empty(&te->set->pending_update)) {
10552 list_add_tail(&te->set->pending_update,
10555 nft_trans_destroy(trans);
10557 case NFT_MSG_NEWOBJ:
10558 if (nft_trans_obj_update(trans)) {
10559 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10560 nft_trans_destroy(trans);
10562 nft_use_dec_restore(&trans->ctx.table->use);
10563 nft_obj_del(nft_trans_obj(trans));
10566 case NFT_MSG_DELOBJ:
10567 case NFT_MSG_DESTROYOBJ:
10568 nft_use_inc_restore(&trans->ctx.table->use);
10569 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10570 nft_trans_destroy(trans);
10572 case NFT_MSG_NEWFLOWTABLE:
10573 if (nft_trans_flowtable_update(trans)) {
10574 nft_unregister_flowtable_net_hooks(net,
10575 &nft_trans_flowtable_hooks(trans));
10577 nft_use_dec_restore(&trans->ctx.table->use);
10578 list_del_rcu(&nft_trans_flowtable(trans)->list);
10579 nft_unregister_flowtable_net_hooks(net,
10580 &nft_trans_flowtable(trans)->hook_list);
10583 case NFT_MSG_DELFLOWTABLE:
10584 case NFT_MSG_DESTROYFLOWTABLE:
10585 if (nft_trans_flowtable_update(trans)) {
10586 list_splice(&nft_trans_flowtable_hooks(trans),
10587 &nft_trans_flowtable(trans)->hook_list);
10589 nft_use_inc_restore(&trans->ctx.table->use);
10590 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10592 nft_trans_destroy(trans);
10597 nft_set_abort_update(&set_update_list);
10601 list_for_each_entry_safe_reverse(trans, next,
10602 &nft_net->commit_list, list) {
10603 nft_trans_list_del(trans);
10604 nf_tables_abort_release(trans);
10607 if (action == NFNL_ABORT_AUTOLOAD)
10608 nf_tables_module_autoload(net);
10610 nf_tables_module_autoload_cleanup(net);
10615 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10616 enum nfnl_abort_action action)
10618 struct nftables_pernet *nft_net = nft_pernet(net);
10619 unsigned int gc_seq;
10622 gc_seq = nft_gc_seq_begin(nft_net);
10623 ret = __nf_tables_abort(net, action);
10624 nft_gc_seq_end(nft_net, gc_seq);
10625 mutex_unlock(&nft_net->commit_mutex);
10630 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10632 struct nftables_pernet *nft_net = nft_pernet(net);
10635 mutex_lock(&nft_net->commit_mutex);
10636 nft_net->tstamp = get_jiffies_64();
10638 genid_ok = genid == 0 || nft_net->base_seq == genid;
10640 mutex_unlock(&nft_net->commit_mutex);
10642 /* else, commit mutex has to be released by commit or abort function */
10646 static const struct nfnetlink_subsystem nf_tables_subsys = {
10647 .name = "nf_tables",
10648 .subsys_id = NFNL_SUBSYS_NFTABLES,
10649 .cb_count = NFT_MSG_MAX,
10650 .cb = nf_tables_cb,
10651 .commit = nf_tables_commit,
10652 .abort = nf_tables_abort,
10653 .valid_genid = nf_tables_valid_genid,
10654 .owner = THIS_MODULE,
10657 int nft_chain_validate_dependency(const struct nft_chain *chain,
10658 enum nft_chain_types type)
10660 const struct nft_base_chain *basechain;
10662 if (nft_is_base_chain(chain)) {
10663 basechain = nft_base_chain(chain);
10664 if (basechain->type->type != type)
10665 return -EOPNOTSUPP;
10669 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10671 int nft_chain_validate_hooks(const struct nft_chain *chain,
10672 unsigned int hook_flags)
10674 struct nft_base_chain *basechain;
10676 if (nft_is_base_chain(chain)) {
10677 basechain = nft_base_chain(chain);
10679 if ((1 << basechain->ops.hooknum) & hook_flags)
10682 return -EOPNOTSUPP;
10687 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10690 * Loop detection - walk through the ruleset beginning at the destination chain
10691 * of a new jump until either the source chain is reached (loop) or all
10692 * reachable chains have been traversed.
10694 * The loop check is performed whenever a new jump verdict is added to an
10695 * expression or verdict map or a verdict map is bound to a new chain.
10698 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10699 const struct nft_chain *chain);
10701 static int nft_check_loops(const struct nft_ctx *ctx,
10702 const struct nft_set_ext *ext)
10704 const struct nft_data *data;
10707 data = nft_set_ext_data(ext);
10708 switch (data->verdict.code) {
10711 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10721 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10722 struct nft_set *set,
10723 const struct nft_set_iter *iter,
10724 struct nft_elem_priv *elem_priv)
10726 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem_priv);
10728 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10729 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10732 return nft_check_loops(ctx, ext);
10735 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10736 struct nft_set *set)
10738 u8 genmask = nft_genmask_next(ctx->net);
10739 struct nft_set_elem_catchall *catchall;
10740 struct nft_set_ext *ext;
10743 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10744 ext = nft_set_elem_ext(set, catchall->elem);
10745 if (!nft_set_elem_active(ext, genmask))
10748 ret = nft_check_loops(ctx, ext);
10756 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10757 const struct nft_chain *chain)
10759 const struct nft_rule *rule;
10760 const struct nft_expr *expr, *last;
10761 struct nft_set *set;
10762 struct nft_set_binding *binding;
10763 struct nft_set_iter iter;
10765 if (ctx->chain == chain)
10768 if (fatal_signal_pending(current))
10771 list_for_each_entry(rule, &chain->rules, list) {
10772 nft_rule_for_each_expr(expr, last, rule) {
10773 struct nft_immediate_expr *priv;
10774 const struct nft_data *data;
10777 if (strcmp(expr->ops->type->name, "immediate"))
10780 priv = nft_expr_priv(expr);
10781 if (priv->dreg != NFT_REG_VERDICT)
10784 data = &priv->data;
10785 switch (data->verdict.code) {
10788 err = nf_tables_check_loops(ctx,
10789 data->verdict.chain);
10799 list_for_each_entry(set, &ctx->table->sets, list) {
10800 if (!nft_is_active_next(ctx->net, set))
10802 if (!(set->flags & NFT_SET_MAP) ||
10803 set->dtype != NFT_DATA_VERDICT)
10806 list_for_each_entry(binding, &set->bindings, list) {
10807 if (!(binding->flags & NFT_SET_MAP) ||
10808 binding->chain != chain)
10811 iter.genmask = nft_genmask_next(ctx->net);
10815 iter.fn = nf_tables_loop_check_setelem;
10817 set->ops->walk(ctx, set, &iter);
10819 iter.err = nft_set_catchall_loops(ctx, set);
10830 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10832 * @attr: netlink attribute to fetch value from
10833 * @max: maximum value to be stored in dest
10834 * @dest: pointer to the variable
10836 * Parse, check and store a given u32 netlink attribute into variable.
10837 * This function returns -ERANGE if the value goes over maximum value.
10838 * Otherwise a 0 is returned and the attribute value is stored in the
10839 * destination variable.
10841 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10845 val = ntohl(nla_get_be32(attr));
10852 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10854 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10858 reg = ntohl(nla_get_be32(attr));
10860 case NFT_REG_VERDICT...NFT_REG_4:
10861 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10863 case NFT_REG32_00...NFT_REG32_15:
10864 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10874 * nft_dump_register - dump a register value to a netlink attribute
10876 * @skb: socket buffer
10877 * @attr: attribute number
10878 * @reg: register number
10880 * Construct a netlink attribute containing the register number. For
10881 * compatibility reasons, register numbers being a multiple of 4 are
10882 * translated to the corresponding 128 bit register numbers.
10884 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10886 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10887 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10889 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10891 return nla_put_be32(skb, attr, htonl(reg));
10893 EXPORT_SYMBOL_GPL(nft_dump_register);
10895 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10897 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10901 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10907 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10912 err = nft_parse_register(attr, ®);
10916 err = nft_validate_register_load(reg, len);
10923 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10925 static int nft_validate_register_store(const struct nft_ctx *ctx,
10926 enum nft_registers reg,
10927 const struct nft_data *data,
10928 enum nft_data_types type,
10934 case NFT_REG_VERDICT:
10935 if (type != NFT_DATA_VERDICT)
10938 if (data != NULL &&
10939 (data->verdict.code == NFT_GOTO ||
10940 data->verdict.code == NFT_JUMP)) {
10941 err = nf_tables_check_loops(ctx, data->verdict.chain);
10948 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10952 if (reg * NFT_REG32_SIZE + len >
10953 sizeof_field(struct nft_regs, data))
10956 if (data != NULL && type != NFT_DATA_VALUE)
10962 int nft_parse_register_store(const struct nft_ctx *ctx,
10963 const struct nlattr *attr, u8 *dreg,
10964 const struct nft_data *data,
10965 enum nft_data_types type, unsigned int len)
10970 err = nft_parse_register(attr, ®);
10974 err = nft_validate_register_store(ctx, reg, data, type, len);
10981 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10983 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10984 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10985 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10986 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10987 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10990 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10991 struct nft_data_desc *desc, const struct nlattr *nla)
10993 u8 genmask = nft_genmask_next(ctx->net);
10994 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10995 struct nft_chain *chain;
10998 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10999 nft_verdict_policy, NULL);
11003 if (!tb[NFTA_VERDICT_CODE])
11006 /* zero padding hole for memcmp */
11007 memset(data, 0, sizeof(*data));
11008 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
11010 switch (data->verdict.code) {
11021 if (tb[NFTA_VERDICT_CHAIN]) {
11022 chain = nft_chain_lookup(ctx->net, ctx->table,
11023 tb[NFTA_VERDICT_CHAIN],
11025 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
11026 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
11027 tb[NFTA_VERDICT_CHAIN_ID],
11030 return PTR_ERR(chain);
11036 return PTR_ERR(chain);
11037 if (nft_is_base_chain(chain))
11038 return -EOPNOTSUPP;
11039 if (nft_chain_is_bound(chain))
11041 if (desc->flags & NFT_DATA_DESC_SETELEM &&
11042 chain->flags & NFT_CHAIN_BINDING)
11044 if (!nft_use_inc(&chain->use))
11047 data->verdict.chain = chain;
11053 desc->len = sizeof(data->verdict);
11058 static void nft_verdict_uninit(const struct nft_data *data)
11060 struct nft_chain *chain;
11062 switch (data->verdict.code) {
11065 chain = data->verdict.chain;
11066 nft_use_dec(&chain->use);
11071 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
11073 struct nlattr *nest;
11075 nest = nla_nest_start_noflag(skb, type);
11077 goto nla_put_failure;
11079 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
11080 goto nla_put_failure;
11085 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
11087 goto nla_put_failure;
11089 nla_nest_end(skb, nest);
11096 static int nft_value_init(const struct nft_ctx *ctx,
11097 struct nft_data *data, struct nft_data_desc *desc,
11098 const struct nlattr *nla)
11102 len = nla_len(nla);
11105 if (len > desc->size)
11108 if (len != desc->len)
11114 nla_memcpy(data->data, nla, len);
11119 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
11122 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
11125 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
11126 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
11127 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
11131 * nft_data_init - parse nf_tables data netlink attributes
11133 * @ctx: context of the expression using the data
11134 * @data: destination struct nft_data
11135 * @desc: data description
11136 * @nla: netlink attribute containing data
11138 * Parse the netlink data attributes and initialize a struct nft_data.
11139 * The type and length of data are returned in the data description.
11141 * The caller can indicate that it only wants to accept data of type
11142 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11144 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11145 struct nft_data_desc *desc, const struct nlattr *nla)
11147 struct nlattr *tb[NFTA_DATA_MAX + 1];
11150 if (WARN_ON_ONCE(!desc->size))
11153 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11154 nft_data_policy, NULL);
11158 if (tb[NFTA_DATA_VALUE]) {
11159 if (desc->type != NFT_DATA_VALUE)
11162 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11163 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11164 if (desc->type != NFT_DATA_VERDICT)
11167 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11174 EXPORT_SYMBOL_GPL(nft_data_init);
11177 * nft_data_release - release a nft_data item
11179 * @data: struct nft_data to release
11180 * @type: type of data
11182 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11183 * all others need to be released by calling this function.
11185 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11187 if (type < NFT_DATA_VERDICT)
11190 case NFT_DATA_VERDICT:
11191 return nft_verdict_uninit(data);
11196 EXPORT_SYMBOL_GPL(nft_data_release);
11198 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11199 enum nft_data_types type, unsigned int len)
11201 struct nlattr *nest;
11204 nest = nla_nest_start_noflag(skb, attr);
11209 case NFT_DATA_VALUE:
11210 err = nft_value_dump(skb, data, len);
11212 case NFT_DATA_VERDICT:
11213 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11220 nla_nest_end(skb, nest);
11223 EXPORT_SYMBOL_GPL(nft_data_dump);
11225 int __nft_release_basechain(struct nft_ctx *ctx)
11227 struct nft_rule *rule, *nr;
11229 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11232 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11233 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11234 list_del(&rule->list);
11235 nft_use_dec(&ctx->chain->use);
11236 nf_tables_rule_release(ctx, rule);
11238 nft_chain_del(ctx->chain);
11239 nft_use_dec(&ctx->table->use);
11240 nf_tables_chain_destroy(ctx);
11244 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11246 static void __nft_release_hook(struct net *net, struct nft_table *table)
11248 struct nft_flowtable *flowtable;
11249 struct nft_chain *chain;
11251 list_for_each_entry(chain, &table->chains, list)
11252 __nf_tables_unregister_hook(net, table, chain, true);
11253 list_for_each_entry(flowtable, &table->flowtables, list)
11254 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11258 static void __nft_release_hooks(struct net *net)
11260 struct nftables_pernet *nft_net = nft_pernet(net);
11261 struct nft_table *table;
11263 list_for_each_entry(table, &nft_net->tables, list) {
11264 if (nft_table_has_owner(table))
11267 __nft_release_hook(net, table);
11271 static void __nft_release_table(struct net *net, struct nft_table *table)
11273 struct nft_flowtable *flowtable, *nf;
11274 struct nft_chain *chain, *nc;
11275 struct nft_object *obj, *ne;
11276 struct nft_rule *rule, *nr;
11277 struct nft_set *set, *ns;
11278 struct nft_ctx ctx = {
11280 .family = NFPROTO_NETDEV,
11283 ctx.family = table->family;
11285 list_for_each_entry(chain, &table->chains, list) {
11286 if (nft_chain_binding(chain))
11290 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11291 list_del(&rule->list);
11292 nft_use_dec(&chain->use);
11293 nf_tables_rule_release(&ctx, rule);
11296 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11297 list_del(&flowtable->list);
11298 nft_use_dec(&table->use);
11299 nf_tables_flowtable_destroy(flowtable);
11301 list_for_each_entry_safe(set, ns, &table->sets, list) {
11302 list_del(&set->list);
11303 nft_use_dec(&table->use);
11304 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11305 nft_map_deactivate(&ctx, set);
11307 nft_set_destroy(&ctx, set);
11309 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11311 nft_use_dec(&table->use);
11312 nft_obj_destroy(&ctx, obj);
11314 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11316 nft_chain_del(chain);
11317 nft_use_dec(&table->use);
11318 nf_tables_chain_destroy(&ctx);
11320 nf_tables_table_destroy(&ctx);
11323 static void __nft_release_tables(struct net *net)
11325 struct nftables_pernet *nft_net = nft_pernet(net);
11326 struct nft_table *table, *nt;
11328 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11329 if (nft_table_has_owner(table))
11332 list_del(&table->list);
11334 __nft_release_table(net, table);
11338 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11341 struct nft_table *table, *to_delete[8];
11342 struct nftables_pernet *nft_net;
11343 struct netlink_notify *n = ptr;
11344 struct net *net = n->net;
11345 unsigned int deleted;
11346 bool restart = false;
11347 unsigned int gc_seq;
11349 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11350 return NOTIFY_DONE;
11352 nft_net = nft_pernet(net);
11354 mutex_lock(&nft_net->commit_mutex);
11356 gc_seq = nft_gc_seq_begin(nft_net);
11358 if (!list_empty(&nf_tables_destroy_list))
11359 nf_tables_trans_destroy_flush_work();
11361 list_for_each_entry(table, &nft_net->tables, list) {
11362 if (nft_table_has_owner(table) &&
11363 n->portid == table->nlpid) {
11364 __nft_release_hook(net, table);
11365 list_del_rcu(&table->list);
11366 to_delete[deleted++] = table;
11367 if (deleted >= ARRAY_SIZE(to_delete))
11372 restart = deleted >= ARRAY_SIZE(to_delete);
11375 __nft_release_table(net, to_delete[--deleted]);
11380 nft_gc_seq_end(nft_net, gc_seq);
11382 mutex_unlock(&nft_net->commit_mutex);
11384 return NOTIFY_DONE;
11387 static struct notifier_block nft_nl_notifier = {
11388 .notifier_call = nft_rcv_nl_event,
11391 static int __net_init nf_tables_init_net(struct net *net)
11393 struct nftables_pernet *nft_net = nft_pernet(net);
11395 INIT_LIST_HEAD(&nft_net->tables);
11396 INIT_LIST_HEAD(&nft_net->commit_list);
11397 INIT_LIST_HEAD(&nft_net->binding_list);
11398 INIT_LIST_HEAD(&nft_net->module_list);
11399 INIT_LIST_HEAD(&nft_net->notify_list);
11400 mutex_init(&nft_net->commit_mutex);
11401 nft_net->base_seq = 1;
11402 nft_net->gc_seq = 0;
11403 nft_net->validate_state = NFT_VALIDATE_SKIP;
11408 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11410 struct nftables_pernet *nft_net = nft_pernet(net);
11412 mutex_lock(&nft_net->commit_mutex);
11413 __nft_release_hooks(net);
11414 mutex_unlock(&nft_net->commit_mutex);
11417 static void __net_exit nf_tables_exit_net(struct net *net)
11419 struct nftables_pernet *nft_net = nft_pernet(net);
11420 unsigned int gc_seq;
11422 mutex_lock(&nft_net->commit_mutex);
11424 gc_seq = nft_gc_seq_begin(nft_net);
11426 if (!list_empty(&nft_net->commit_list) ||
11427 !list_empty(&nft_net->module_list))
11428 __nf_tables_abort(net, NFNL_ABORT_NONE);
11430 __nft_release_tables(net);
11432 nft_gc_seq_end(nft_net, gc_seq);
11434 mutex_unlock(&nft_net->commit_mutex);
11435 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11436 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11437 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11440 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11442 flush_work(&trans_gc_work);
11445 static struct pernet_operations nf_tables_net_ops = {
11446 .init = nf_tables_init_net,
11447 .pre_exit = nf_tables_pre_exit_net,
11448 .exit = nf_tables_exit_net,
11449 .exit_batch = nf_tables_exit_batch,
11450 .id = &nf_tables_net_id,
11451 .size = sizeof(struct nftables_pernet),
11454 static int __init nf_tables_module_init(void)
11458 err = register_pernet_subsys(&nf_tables_net_ops);
11462 err = nft_chain_filter_init();
11464 goto err_chain_filter;
11466 err = nf_tables_core_module_init();
11468 goto err_core_module;
11470 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11472 goto err_netdev_notifier;
11474 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11476 goto err_rht_objname;
11478 err = nft_offload_init();
11482 err = netlink_register_notifier(&nft_nl_notifier);
11484 goto err_netlink_notifier;
11487 err = nfnetlink_subsys_register(&nf_tables_subsys);
11489 goto err_nfnl_subsys;
11491 nft_chain_route_init();
11496 netlink_unregister_notifier(&nft_nl_notifier);
11497 err_netlink_notifier:
11498 nft_offload_exit();
11500 rhltable_destroy(&nft_objname_ht);
11502 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11503 err_netdev_notifier:
11504 nf_tables_core_module_exit();
11506 nft_chain_filter_fini();
11508 unregister_pernet_subsys(&nf_tables_net_ops);
11512 static void __exit nf_tables_module_exit(void)
11514 nfnetlink_subsys_unregister(&nf_tables_subsys);
11515 netlink_unregister_notifier(&nft_nl_notifier);
11516 nft_offload_exit();
11517 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11518 nft_chain_filter_fini();
11519 nft_chain_route_fini();
11520 unregister_pernet_subsys(&nf_tables_net_ops);
11521 cancel_work_sync(&trans_gc_work);
11522 cancel_work_sync(&trans_destroy_work);
11524 rhltable_destroy(&nft_objname_ht);
11525 nf_tables_core_module_exit();
11528 module_init(nf_tables_module_init);
11529 module_exit(nf_tables_module_exit);
11531 MODULE_LICENSE("GPL");
11532 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11533 MODULE_DESCRIPTION("Framework for packet filtering and classification");
11534 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);