1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static LIST_HEAD(nf_tables_gc_list);
35 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
36 static DEFINE_SPINLOCK(nf_tables_gc_list_lock);
39 NFT_VALIDATE_SKIP = 0,
44 static struct rhltable nft_objname_ht;
46 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
47 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
48 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
50 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
51 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
52 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
54 static const struct rhashtable_params nft_chain_ht_params = {
55 .head_offset = offsetof(struct nft_chain, rhlhead),
56 .key_offset = offsetof(struct nft_chain, name),
57 .hashfn = nft_chain_hash,
58 .obj_hashfn = nft_chain_hash_obj,
59 .obj_cmpfn = nft_chain_hash_cmp,
60 .automatic_shrinking = true,
63 static const struct rhashtable_params nft_objname_ht_params = {
64 .head_offset = offsetof(struct nft_object, rhlhead),
65 .key_offset = offsetof(struct nft_object, key),
66 .hashfn = nft_objname_hash,
67 .obj_hashfn = nft_objname_hash_obj,
68 .obj_cmpfn = nft_objname_hash_cmp,
69 .automatic_shrinking = true,
72 struct nft_audit_data {
73 struct nft_table *table;
76 struct list_head list;
79 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
80 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
81 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
82 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
83 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
84 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
85 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
86 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
87 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
88 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
89 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
90 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
91 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
92 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
93 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
94 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
95 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
96 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
99 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
100 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
101 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
102 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
103 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
104 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
108 static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
110 switch (table->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 table->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_trans_gc_work(struct work_struct *work);
127 static DECLARE_WORK(trans_gc_work, nft_trans_gc_work);
129 static void nft_ctx_init(struct nft_ctx *ctx,
131 const struct sk_buff *skb,
132 const struct nlmsghdr *nlh,
134 struct nft_table *table,
135 struct nft_chain *chain,
136 const struct nlattr * const *nla)
139 ctx->family = family;
144 ctx->portid = NETLINK_CB(skb).portid;
145 ctx->report = nlmsg_report(nlh);
146 ctx->flags = nlh->nlmsg_flags;
147 ctx->seq = nlh->nlmsg_seq;
150 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
151 int msg_type, u32 size, gfp_t gfp)
153 struct nft_trans *trans;
155 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
159 INIT_LIST_HEAD(&trans->list);
160 INIT_LIST_HEAD(&trans->binding_list);
161 trans->msg_type = msg_type;
167 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
168 int msg_type, u32 size)
170 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
173 static void nft_trans_list_del(struct nft_trans *trans)
175 list_del(&trans->list);
176 list_del(&trans->binding_list);
179 static void nft_trans_destroy(struct nft_trans *trans)
181 nft_trans_list_del(trans);
185 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
188 struct nftables_pernet *nft_net;
189 struct net *net = ctx->net;
190 struct nft_trans *trans;
192 if (!nft_set_is_anonymous(set))
195 nft_net = nft_pernet(net);
196 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
197 switch (trans->msg_type) {
199 if (nft_trans_set(trans) == set)
200 nft_trans_set_bound(trans) = bind;
202 case NFT_MSG_NEWSETELEM:
203 if (nft_trans_elem_set(trans) == set)
204 nft_trans_elem_set_bound(trans) = bind;
210 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
212 return __nft_set_trans_bind(ctx, set, true);
215 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
217 return __nft_set_trans_bind(ctx, set, false);
220 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
221 struct nft_chain *chain, bool bind)
223 struct nftables_pernet *nft_net;
224 struct net *net = ctx->net;
225 struct nft_trans *trans;
227 if (!nft_chain_binding(chain))
230 nft_net = nft_pernet(net);
231 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
232 switch (trans->msg_type) {
233 case NFT_MSG_NEWCHAIN:
234 if (nft_trans_chain(trans) == chain)
235 nft_trans_chain_bound(trans) = bind;
237 case NFT_MSG_NEWRULE:
238 if (trans->ctx.chain == chain)
239 nft_trans_rule_bound(trans) = bind;
245 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
246 struct nft_chain *chain)
248 __nft_chain_trans_bind(ctx, chain, true);
251 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
253 if (!nft_chain_binding(chain))
256 if (nft_chain_binding(ctx->chain))
262 if (!nft_use_inc(&chain->use))
266 nft_chain_trans_bind(ctx, chain);
271 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
273 __nft_chain_trans_bind(ctx, chain, false);
276 static int nft_netdev_register_hooks(struct net *net,
277 struct list_head *hook_list)
279 struct nft_hook *hook;
283 list_for_each_entry(hook, hook_list, list) {
284 err = nf_register_net_hook(net, &hook->ops);
293 list_for_each_entry(hook, hook_list, list) {
297 nf_unregister_net_hook(net, &hook->ops);
302 static void nft_netdev_unregister_hooks(struct net *net,
303 struct list_head *hook_list,
306 struct nft_hook *hook, *next;
308 list_for_each_entry_safe(hook, next, hook_list, list) {
309 nf_unregister_net_hook(net, &hook->ops);
310 if (release_netdev) {
311 list_del(&hook->list);
312 kfree_rcu(hook, rcu);
317 static int nf_tables_register_hook(struct net *net,
318 const struct nft_table *table,
319 struct nft_chain *chain)
321 struct nft_base_chain *basechain;
322 const struct nf_hook_ops *ops;
324 if (table->flags & NFT_TABLE_F_DORMANT ||
325 !nft_is_base_chain(chain))
328 basechain = nft_base_chain(chain);
329 ops = &basechain->ops;
331 if (basechain->type->ops_register)
332 return basechain->type->ops_register(net, ops);
334 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
335 return nft_netdev_register_hooks(net, &basechain->hook_list);
337 return nf_register_net_hook(net, &basechain->ops);
340 static void __nf_tables_unregister_hook(struct net *net,
341 const struct nft_table *table,
342 struct nft_chain *chain,
345 struct nft_base_chain *basechain;
346 const struct nf_hook_ops *ops;
348 if (table->flags & NFT_TABLE_F_DORMANT ||
349 !nft_is_base_chain(chain))
351 basechain = nft_base_chain(chain);
352 ops = &basechain->ops;
354 if (basechain->type->ops_unregister)
355 return basechain->type->ops_unregister(net, ops);
357 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
358 nft_netdev_unregister_hooks(net, &basechain->hook_list,
361 nf_unregister_net_hook(net, &basechain->ops);
364 static void nf_tables_unregister_hook(struct net *net,
365 const struct nft_table *table,
366 struct nft_chain *chain)
368 return __nf_tables_unregister_hook(net, table, chain, false);
371 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
373 struct nftables_pernet *nft_net = nft_pernet(net);
375 switch (trans->msg_type) {
377 if (!nft_trans_set_update(trans) &&
378 nft_set_is_anonymous(nft_trans_set(trans)))
379 list_add_tail(&trans->binding_list, &nft_net->binding_list);
381 case NFT_MSG_NEWCHAIN:
382 if (!nft_trans_chain_update(trans) &&
383 nft_chain_binding(nft_trans_chain(trans)))
384 list_add_tail(&trans->binding_list, &nft_net->binding_list);
388 list_add_tail(&trans->list, &nft_net->commit_list);
391 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
393 struct nft_trans *trans;
395 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
399 if (msg_type == NFT_MSG_NEWTABLE)
400 nft_activate_next(ctx->net, ctx->table);
402 nft_trans_commit_list_add_tail(ctx->net, trans);
406 static int nft_deltable(struct nft_ctx *ctx)
410 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
414 nft_deactivate_next(ctx->net, ctx->table);
418 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
420 struct nft_trans *trans;
422 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
424 return ERR_PTR(-ENOMEM);
426 if (msg_type == NFT_MSG_NEWCHAIN) {
427 nft_activate_next(ctx->net, ctx->chain);
429 if (ctx->nla[NFTA_CHAIN_ID]) {
430 nft_trans_chain_id(trans) =
431 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
434 nft_trans_chain(trans) = ctx->chain;
435 nft_trans_commit_list_add_tail(ctx->net, trans);
440 static int nft_delchain(struct nft_ctx *ctx)
442 struct nft_trans *trans;
444 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
446 return PTR_ERR(trans);
448 nft_use_dec(&ctx->table->use);
449 nft_deactivate_next(ctx->net, ctx->chain);
454 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
456 struct nft_expr *expr;
458 expr = nft_expr_first(rule);
459 while (nft_expr_more(rule, expr)) {
460 if (expr->ops->activate)
461 expr->ops->activate(ctx, expr);
463 expr = nft_expr_next(expr);
467 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
468 enum nft_trans_phase phase)
470 struct nft_expr *expr;
472 expr = nft_expr_first(rule);
473 while (nft_expr_more(rule, expr)) {
474 if (expr->ops->deactivate)
475 expr->ops->deactivate(ctx, expr, phase);
477 expr = nft_expr_next(expr);
482 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
484 /* You cannot delete the same rule twice */
485 if (nft_is_active_next(ctx->net, rule)) {
486 nft_deactivate_next(ctx->net, rule);
487 nft_use_dec(&ctx->chain->use);
493 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
494 struct nft_rule *rule)
496 struct nft_trans *trans;
498 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
502 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
503 nft_trans_rule_id(trans) =
504 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
506 nft_trans_rule(trans) = rule;
507 nft_trans_commit_list_add_tail(ctx->net, trans);
512 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
514 struct nft_flow_rule *flow;
515 struct nft_trans *trans;
518 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
522 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
523 flow = nft_flow_rule_create(ctx->net, rule);
525 nft_trans_destroy(trans);
526 return PTR_ERR(flow);
529 nft_trans_flow_rule(trans) = flow;
532 err = nf_tables_delrule_deactivate(ctx, rule);
534 nft_trans_destroy(trans);
537 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
542 static int nft_delrule_by_chain(struct nft_ctx *ctx)
544 struct nft_rule *rule;
547 list_for_each_entry(rule, &ctx->chain->rules, list) {
548 if (!nft_is_active_next(ctx->net, rule))
551 err = nft_delrule(ctx, rule);
558 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
560 const struct nft_set_desc *desc)
562 struct nft_trans *trans;
564 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
568 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
569 nft_trans_set_id(trans) =
570 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
571 nft_activate_next(ctx->net, set);
573 nft_trans_set(trans) = set;
575 nft_trans_set_update(trans) = true;
576 nft_trans_set_gc_int(trans) = desc->gc_int;
577 nft_trans_set_timeout(trans) = desc->timeout;
578 nft_trans_set_size(trans) = desc->size;
580 nft_trans_commit_list_add_tail(ctx->net, trans);
585 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
588 return __nft_trans_set_add(ctx, msg_type, set, NULL);
591 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
593 const struct nft_set_iter *iter,
594 struct nft_set_elem *elem)
596 nft_setelem_data_deactivate(ctx->net, set, elem);
601 struct nft_set_elem_catchall {
602 struct list_head list;
607 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
610 u8 genmask = nft_genmask_next(ctx->net);
611 struct nft_set_elem_catchall *catchall;
612 struct nft_set_elem elem;
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 elem.priv = catchall->elem;
621 nft_setelem_data_deactivate(ctx->net, set, &elem);
626 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
628 struct nft_set_iter iter = {
629 .genmask = nft_genmask_next(ctx->net),
630 .fn = nft_mapelem_deactivate,
633 set->ops->walk(ctx, set, &iter);
634 WARN_ON_ONCE(iter.err);
636 nft_map_catchall_deactivate(ctx, set);
639 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
643 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
647 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
648 nft_map_deactivate(ctx, set);
650 nft_deactivate_next(ctx->net, set);
651 nft_use_dec(&ctx->table->use);
656 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
657 struct nft_object *obj)
659 struct nft_trans *trans;
661 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
665 if (msg_type == NFT_MSG_NEWOBJ)
666 nft_activate_next(ctx->net, obj);
668 nft_trans_obj(trans) = obj;
669 nft_trans_commit_list_add_tail(ctx->net, trans);
674 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
678 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
682 nft_deactivate_next(ctx->net, obj);
683 nft_use_dec(&ctx->table->use);
688 static int 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));
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)
713 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
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 nft_trans_destroy(trans);
1259 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1261 const char *name = data;
1263 return jhash(name, strlen(name), seed);
1266 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1268 const struct nft_chain *chain = data;
1270 return nft_chain_hash(chain->name, 0, seed);
1273 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1276 const struct nft_chain *chain = ptr;
1277 const char *name = arg->key;
1279 return strcmp(chain->name, name);
1282 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1284 const struct nft_object_hash_key *k = data;
1286 seed ^= hash_ptr(k->table, 32);
1288 return jhash(k->name, strlen(k->name), seed);
1291 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1293 const struct nft_object *obj = data;
1295 return nft_objname_hash(&obj->key, 0, seed);
1298 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1301 const struct nft_object_hash_key *k = arg->key;
1302 const struct nft_object *obj = ptr;
1304 if (obj->key.table != k->table)
1307 return strcmp(obj->key.name, k->name);
1310 static bool nft_supported_family(u8 family)
1313 #ifdef CONFIG_NF_TABLES_INET
1314 || family == NFPROTO_INET
1316 #ifdef CONFIG_NF_TABLES_IPV4
1317 || family == NFPROTO_IPV4
1319 #ifdef CONFIG_NF_TABLES_ARP
1320 || family == NFPROTO_ARP
1322 #ifdef CONFIG_NF_TABLES_NETDEV
1323 || family == NFPROTO_NETDEV
1325 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1326 || family == NFPROTO_BRIDGE
1328 #ifdef CONFIG_NF_TABLES_IPV6
1329 || family == NFPROTO_IPV6
1334 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1335 const struct nlattr * const nla[])
1337 struct nftables_pernet *nft_net = nft_pernet(info->net);
1338 struct netlink_ext_ack *extack = info->extack;
1339 u8 genmask = nft_genmask_next(info->net);
1340 u8 family = info->nfmsg->nfgen_family;
1341 struct net *net = info->net;
1342 const struct nlattr *attr;
1343 struct nft_table *table;
1348 if (!nft_supported_family(family))
1351 lockdep_assert_held(&nft_net->commit_mutex);
1352 attr = nla[NFTA_TABLE_NAME];
1353 table = nft_table_lookup(net, attr, family, genmask,
1354 NETLINK_CB(skb).portid);
1355 if (IS_ERR(table)) {
1356 if (PTR_ERR(table) != -ENOENT)
1357 return PTR_ERR(table);
1359 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1360 NL_SET_BAD_ATTR(extack, attr);
1363 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1366 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1368 return nf_tables_updtable(&ctx);
1371 if (nla[NFTA_TABLE_FLAGS]) {
1372 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1373 if (flags & ~NFT_TABLE_F_MASK)
1378 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1382 table->validate_state = nft_net->validate_state;
1383 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1384 if (table->name == NULL)
1387 if (nla[NFTA_TABLE_USERDATA]) {
1388 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1389 if (table->udata == NULL)
1390 goto err_table_udata;
1392 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1395 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1399 INIT_LIST_HEAD(&table->chains);
1400 INIT_LIST_HEAD(&table->sets);
1401 INIT_LIST_HEAD(&table->objects);
1402 INIT_LIST_HEAD(&table->flowtables);
1403 table->family = family;
1404 table->flags = flags;
1405 table->handle = ++nft_net->table_handle;
1406 if (table->flags & NFT_TABLE_F_OWNER)
1407 table->nlpid = NETLINK_CB(skb).portid;
1409 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1410 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1414 list_add_tail_rcu(&table->list, &nft_net->tables);
1417 rhltable_destroy(&table->chains_ht);
1419 kfree(table->udata);
1428 static int nft_flush_table(struct nft_ctx *ctx)
1430 struct nft_flowtable *flowtable, *nft;
1431 struct nft_chain *chain, *nc;
1432 struct nft_object *obj, *ne;
1433 struct nft_set *set, *ns;
1436 list_for_each_entry(chain, &ctx->table->chains, list) {
1437 if (!nft_is_active_next(ctx->net, chain))
1440 if (nft_chain_binding(chain))
1445 err = nft_delrule_by_chain(ctx);
1450 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1451 if (!nft_is_active_next(ctx->net, set))
1454 if (nft_set_is_anonymous(set))
1457 err = nft_delset(ctx, set);
1462 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1463 if (!nft_is_active_next(ctx->net, flowtable))
1466 err = nft_delflowtable(ctx, flowtable);
1471 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1472 if (!nft_is_active_next(ctx->net, obj))
1475 err = nft_delobj(ctx, obj);
1480 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1481 if (!nft_is_active_next(ctx->net, chain))
1484 if (nft_chain_binding(chain))
1489 err = nft_delchain(ctx);
1494 err = nft_deltable(ctx);
1499 static int nft_flush(struct nft_ctx *ctx, int family)
1501 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1502 const struct nlattr * const *nla = ctx->nla;
1503 struct nft_table *table, *nt;
1506 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1507 if (family != AF_UNSPEC && table->family != family)
1510 ctx->family = table->family;
1512 if (!nft_is_active_next(ctx->net, table))
1515 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1518 if (nla[NFTA_TABLE_NAME] &&
1519 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1524 err = nft_flush_table(ctx);
1532 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1533 const struct nlattr * const nla[])
1535 struct netlink_ext_ack *extack = info->extack;
1536 u8 genmask = nft_genmask_next(info->net);
1537 u8 family = info->nfmsg->nfgen_family;
1538 struct net *net = info->net;
1539 const struct nlattr *attr;
1540 struct nft_table *table;
1543 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1544 if (family == AF_UNSPEC ||
1545 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1546 return nft_flush(&ctx, family);
1548 if (nla[NFTA_TABLE_HANDLE]) {
1549 attr = nla[NFTA_TABLE_HANDLE];
1550 table = nft_table_lookup_byhandle(net, attr, family, genmask,
1551 NETLINK_CB(skb).portid);
1553 attr = nla[NFTA_TABLE_NAME];
1554 table = nft_table_lookup(net, attr, family, genmask,
1555 NETLINK_CB(skb).portid);
1558 if (IS_ERR(table)) {
1559 if (PTR_ERR(table) == -ENOENT &&
1560 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYTABLE)
1563 NL_SET_BAD_ATTR(extack, attr);
1564 return PTR_ERR(table);
1567 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1571 ctx.family = family;
1574 return nft_flush_table(&ctx);
1577 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1579 if (WARN_ON(ctx->table->use > 0))
1582 rhltable_destroy(&ctx->table->chains_ht);
1583 kfree(ctx->table->name);
1584 kfree(ctx->table->udata);
1588 void nft_register_chain_type(const struct nft_chain_type *ctype)
1590 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1591 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1592 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1595 chain_type[ctype->family][ctype->type] = ctype;
1596 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1598 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1600 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1603 chain_type[ctype->family][ctype->type] = NULL;
1604 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1606 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1612 static struct nft_chain *
1613 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1615 struct nft_chain *chain;
1617 list_for_each_entry(chain, &table->chains, list) {
1618 if (chain->handle == handle &&
1619 nft_active_genmask(chain, genmask))
1623 return ERR_PTR(-ENOENT);
1626 static bool lockdep_commit_lock_is_held(const struct net *net)
1628 #ifdef CONFIG_PROVE_LOCKING
1629 struct nftables_pernet *nft_net = nft_pernet(net);
1631 return lockdep_is_held(&nft_net->commit_mutex);
1637 static struct nft_chain *nft_chain_lookup(struct net *net,
1638 struct nft_table *table,
1639 const struct nlattr *nla, u8 genmask)
1641 char search[NFT_CHAIN_MAXNAMELEN + 1];
1642 struct rhlist_head *tmp, *list;
1643 struct nft_chain *chain;
1646 return ERR_PTR(-EINVAL);
1648 nla_strscpy(search, nla, sizeof(search));
1650 WARN_ON(!rcu_read_lock_held() &&
1651 !lockdep_commit_lock_is_held(net));
1653 chain = ERR_PTR(-ENOENT);
1655 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1659 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1660 if (nft_active_genmask(chain, genmask))
1663 chain = ERR_PTR(-ENOENT);
1669 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1670 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1671 .len = NFT_TABLE_MAXNAMELEN - 1 },
1672 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1673 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1674 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1675 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1676 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1677 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1678 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1679 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1680 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1681 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1682 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1683 .len = NFT_USERDATA_MAXLEN },
1686 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1687 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1688 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1689 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1690 .len = IFNAMSIZ - 1 },
1693 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1695 struct nft_stats *cpu_stats, total;
1696 struct nlattr *nest;
1704 memset(&total, 0, sizeof(total));
1705 for_each_possible_cpu(cpu) {
1706 cpu_stats = per_cpu_ptr(stats, cpu);
1708 seq = u64_stats_fetch_begin(&cpu_stats->syncp);
1709 pkts = cpu_stats->pkts;
1710 bytes = cpu_stats->bytes;
1711 } while (u64_stats_fetch_retry(&cpu_stats->syncp, seq));
1713 total.bytes += bytes;
1715 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1717 goto nla_put_failure;
1719 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1720 NFTA_COUNTER_PAD) ||
1721 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1723 goto nla_put_failure;
1725 nla_nest_end(skb, nest);
1732 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1733 const struct nft_base_chain *basechain,
1734 const struct list_head *hook_list)
1736 const struct nf_hook_ops *ops = &basechain->ops;
1737 struct nft_hook *hook, *first = NULL;
1738 struct nlattr *nest, *nest_devs;
1741 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1743 goto nla_put_failure;
1744 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1745 goto nla_put_failure;
1746 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1747 goto nla_put_failure;
1749 if (nft_base_chain_netdev(family, ops->hooknum)) {
1750 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1752 goto nla_put_failure;
1755 hook_list = &basechain->hook_list;
1757 list_for_each_entry(hook, hook_list, list) {
1761 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1762 hook->ops.dev->name))
1763 goto nla_put_failure;
1766 nla_nest_end(skb, nest_devs);
1769 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1770 goto nla_put_failure;
1772 nla_nest_end(skb, nest);
1779 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1780 u32 portid, u32 seq, int event, u32 flags,
1781 int family, const struct nft_table *table,
1782 const struct nft_chain *chain,
1783 const struct list_head *hook_list)
1785 struct nlmsghdr *nlh;
1787 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1788 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1789 NFNETLINK_V0, nft_base_seq(net));
1791 goto nla_put_failure;
1793 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name) ||
1794 nla_put_string(skb, NFTA_CHAIN_NAME, chain->name) ||
1795 nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1797 goto nla_put_failure;
1799 if (event == NFT_MSG_DELCHAIN && !hook_list) {
1800 nlmsg_end(skb, nlh);
1804 if (nft_is_base_chain(chain)) {
1805 const struct nft_base_chain *basechain = nft_base_chain(chain);
1806 struct nft_stats __percpu *stats;
1808 if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
1809 goto nla_put_failure;
1811 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1812 htonl(basechain->policy)))
1813 goto nla_put_failure;
1815 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1816 goto nla_put_failure;
1818 stats = rcu_dereference_check(basechain->stats,
1819 lockdep_commit_lock_is_held(net));
1820 if (nft_dump_stats(skb, stats))
1821 goto nla_put_failure;
1825 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1826 goto nla_put_failure;
1828 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1829 goto nla_put_failure;
1832 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1833 goto nla_put_failure;
1835 nlmsg_end(skb, nlh);
1839 nlmsg_trim(skb, nlh);
1843 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
1844 const struct list_head *hook_list)
1846 struct nftables_pernet *nft_net;
1847 struct sk_buff *skb;
1852 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1855 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1859 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1860 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1862 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1863 event, flags, ctx->family, ctx->table,
1864 ctx->chain, hook_list);
1870 nft_net = nft_pernet(ctx->net);
1871 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1874 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1877 static int nf_tables_dump_chains(struct sk_buff *skb,
1878 struct netlink_callback *cb)
1880 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1881 unsigned int idx = 0, s_idx = cb->args[0];
1882 struct net *net = sock_net(skb->sk);
1883 int family = nfmsg->nfgen_family;
1884 struct nftables_pernet *nft_net;
1885 const struct nft_table *table;
1886 const struct nft_chain *chain;
1889 nft_net = nft_pernet(net);
1890 cb->seq = READ_ONCE(nft_net->base_seq);
1892 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1893 if (family != NFPROTO_UNSPEC && family != table->family)
1896 list_for_each_entry_rcu(chain, &table->chains, list) {
1900 memset(&cb->args[1], 0,
1901 sizeof(cb->args) - sizeof(cb->args[0]));
1902 if (!nft_is_active(net, chain))
1904 if (nf_tables_fill_chain_info(skb, net,
1905 NETLINK_CB(cb->skb).portid,
1909 table->family, table,
1913 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1924 /* called with rcu_read_lock held */
1925 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1926 const struct nlattr * const nla[])
1928 struct netlink_ext_ack *extack = info->extack;
1929 u8 genmask = nft_genmask_cur(info->net);
1930 u8 family = info->nfmsg->nfgen_family;
1931 const struct nft_chain *chain;
1932 struct net *net = info->net;
1933 struct nft_table *table;
1934 struct sk_buff *skb2;
1937 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1938 struct netlink_dump_control c = {
1939 .dump = nf_tables_dump_chains,
1940 .module = THIS_MODULE,
1943 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1946 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1947 if (IS_ERR(table)) {
1948 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1949 return PTR_ERR(table);
1952 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1953 if (IS_ERR(chain)) {
1954 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1955 return PTR_ERR(chain);
1958 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1962 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1963 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1964 0, family, table, chain, NULL);
1966 goto err_fill_chain_info;
1968 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1970 err_fill_chain_info:
1975 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1976 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1977 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1980 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1982 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1983 struct nft_stats __percpu *newstats;
1984 struct nft_stats *stats;
1987 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1988 nft_counter_policy, NULL);
1990 return ERR_PTR(err);
1992 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1993 return ERR_PTR(-EINVAL);
1995 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1996 if (newstats == NULL)
1997 return ERR_PTR(-ENOMEM);
1999 /* Restore old counters on this cpu, no problem. Per-cpu statistics
2000 * are not exposed to userspace.
2003 stats = this_cpu_ptr(newstats);
2004 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
2005 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
2011 static void nft_chain_stats_replace(struct nft_trans *trans)
2013 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
2015 if (!nft_trans_chain_stats(trans))
2018 nft_trans_chain_stats(trans) =
2019 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
2020 lockdep_commit_lock_is_held(trans->ctx.net));
2022 if (!nft_trans_chain_stats(trans))
2023 static_branch_inc(&nft_counters_enabled);
2026 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
2028 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
2029 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
2035 /* should be NULL either via abort or via successful commit */
2036 WARN_ON_ONCE(chain->blob_next);
2037 kvfree(chain->blob_next);
2040 void nf_tables_chain_destroy(struct nft_ctx *ctx)
2042 struct nft_chain *chain = ctx->chain;
2043 struct nft_hook *hook, *next;
2045 if (WARN_ON(chain->use > 0))
2048 /* no concurrent access possible anymore */
2049 nf_tables_chain_free_chain_rules(chain);
2051 if (nft_is_base_chain(chain)) {
2052 struct nft_base_chain *basechain = nft_base_chain(chain);
2054 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2055 list_for_each_entry_safe(hook, next,
2056 &basechain->hook_list, list) {
2057 list_del_rcu(&hook->list);
2058 kfree_rcu(hook, rcu);
2061 module_put(basechain->type->owner);
2062 if (rcu_access_pointer(basechain->stats)) {
2063 static_branch_dec(&nft_counters_enabled);
2064 free_percpu(rcu_dereference_raw(basechain->stats));
2067 kfree(chain->udata);
2071 kfree(chain->udata);
2076 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2077 const struct nlattr *attr)
2079 struct net_device *dev;
2080 char ifname[IFNAMSIZ];
2081 struct nft_hook *hook;
2084 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2087 goto err_hook_alloc;
2090 nla_strscpy(ifname, attr, IFNAMSIZ);
2091 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2092 * indirectly serializing all the other holders of the commit_mutex with
2095 dev = __dev_get_by_name(net, ifname);
2100 hook->ops.dev = dev;
2107 return ERR_PTR(err);
2110 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2111 const struct nft_hook *this)
2113 struct nft_hook *hook;
2115 list_for_each_entry(hook, hook_list, list) {
2116 if (this->ops.dev == hook->ops.dev)
2123 static int nf_tables_parse_netdev_hooks(struct net *net,
2124 const struct nlattr *attr,
2125 struct list_head *hook_list,
2126 struct netlink_ext_ack *extack)
2128 struct nft_hook *hook, *next;
2129 const struct nlattr *tmp;
2130 int rem, n = 0, err;
2132 nla_for_each_nested(tmp, attr, rem) {
2133 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2138 hook = nft_netdev_hook_alloc(net, tmp);
2140 NL_SET_BAD_ATTR(extack, tmp);
2141 err = PTR_ERR(hook);
2144 if (nft_hook_list_find(hook_list, hook)) {
2145 NL_SET_BAD_ATTR(extack, tmp);
2150 list_add_tail(&hook->list, hook_list);
2153 if (n == NFT_NETDEVICE_MAX) {
2162 list_for_each_entry_safe(hook, next, hook_list, list) {
2163 list_del(&hook->list);
2169 struct nft_chain_hook {
2172 const struct nft_chain_type *type;
2173 struct list_head list;
2176 static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
2177 struct list_head *hook_list,
2178 struct netlink_ext_ack *extack, u32 flags)
2180 struct nft_hook *hook;
2183 if (tb[NFTA_HOOK_DEV]) {
2184 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2186 NL_SET_BAD_ATTR(extack, tb[NFTA_HOOK_DEV]);
2187 return PTR_ERR(hook);
2190 list_add_tail(&hook->list, hook_list);
2191 } else if (tb[NFTA_HOOK_DEVS]) {
2192 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2199 if (flags & NFT_CHAIN_HW_OFFLOAD &&
2200 list_empty(hook_list))
2206 static int nft_chain_parse_hook(struct net *net,
2207 struct nft_base_chain *basechain,
2208 const struct nlattr * const nla[],
2209 struct nft_chain_hook *hook, u8 family,
2210 u32 flags, struct netlink_ext_ack *extack)
2212 struct nftables_pernet *nft_net = nft_pernet(net);
2213 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2214 const struct nft_chain_type *type;
2217 lockdep_assert_held(&nft_net->commit_mutex);
2218 lockdep_nfnl_nft_mutex_not_held();
2220 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2221 nla[NFTA_CHAIN_HOOK],
2222 nft_hook_policy, NULL);
2227 if (!ha[NFTA_HOOK_HOOKNUM] ||
2228 !ha[NFTA_HOOK_PRIORITY]) {
2229 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2233 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2234 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2236 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2240 if (nla[NFTA_CHAIN_TYPE]) {
2241 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2244 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2245 return PTR_ERR(type);
2248 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2251 if (type->type == NFT_CHAIN_T_NAT &&
2252 hook->priority <= NF_IP_PRI_CONNTRACK)
2255 if (ha[NFTA_HOOK_HOOKNUM]) {
2256 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2257 if (hook->num != basechain->ops.hooknum)
2260 if (ha[NFTA_HOOK_PRIORITY]) {
2261 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2262 if (hook->priority != basechain->ops.priority)
2266 if (nla[NFTA_CHAIN_TYPE]) {
2267 type = __nf_tables_chain_type_lookup(nla[NFTA_CHAIN_TYPE],
2270 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2274 type = basechain->type;
2278 if (!try_module_get(type->owner)) {
2279 if (nla[NFTA_CHAIN_TYPE])
2280 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2286 INIT_LIST_HEAD(&hook->list);
2287 if (nft_base_chain_netdev(family, hook->num)) {
2288 err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
2290 module_put(type->owner);
2293 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2294 module_put(type->owner);
2301 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2303 struct nft_hook *h, *next;
2305 list_for_each_entry_safe(h, next, &hook->list, list) {
2309 module_put(hook->type->owner);
2312 static void nft_last_rule(const struct nft_chain *chain, const void *ptr)
2314 struct nft_rule_dp_last *lrule;
2316 BUILD_BUG_ON(offsetof(struct nft_rule_dp_last, end) != 0);
2318 lrule = (struct nft_rule_dp_last *)ptr;
2319 lrule->end.is_last = 1;
2320 lrule->chain = chain;
2321 /* blob size does not include the trailer rule */
2324 static struct nft_rule_blob *nf_tables_chain_alloc_rules(const struct nft_chain *chain,
2327 struct nft_rule_blob *blob;
2332 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rule_dp_last);
2334 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2339 nft_last_rule(chain, blob->data);
2344 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2345 const struct nft_chain_hook *hook,
2346 struct nft_chain *chain)
2349 ops->hooknum = hook->num;
2350 ops->priority = hook->priority;
2352 ops->hook = hook->type->hooks[ops->hooknum];
2353 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2356 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2357 struct nft_chain_hook *hook, u32 flags)
2359 struct nft_chain *chain;
2362 basechain->type = hook->type;
2363 INIT_LIST_HEAD(&basechain->hook_list);
2364 chain = &basechain->chain;
2366 if (nft_base_chain_netdev(family, hook->num)) {
2367 list_splice_init(&hook->list, &basechain->hook_list);
2368 list_for_each_entry(h, &basechain->hook_list, list)
2369 nft_basechain_hook_init(&h->ops, family, hook, chain);
2371 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2373 chain->flags |= NFT_CHAIN_BASE | flags;
2374 basechain->policy = NF_ACCEPT;
2375 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2376 !nft_chain_offload_support(basechain)) {
2377 list_splice_init(&basechain->hook_list, &hook->list);
2381 flow_block_init(&basechain->flow_block);
2386 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2390 err = rhltable_insert_key(&table->chains_ht, chain->name,
2391 &chain->rhlhead, nft_chain_ht_params);
2395 list_add_tail_rcu(&chain->list, &table->chains);
2400 static u64 chain_id;
2402 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2403 u8 policy, u32 flags,
2404 struct netlink_ext_ack *extack)
2406 const struct nlattr * const *nla = ctx->nla;
2407 struct nft_table *table = ctx->table;
2408 struct nft_base_chain *basechain;
2409 struct net *net = ctx->net;
2410 char name[NFT_NAME_MAXLEN];
2411 struct nft_rule_blob *blob;
2412 struct nft_trans *trans;
2413 struct nft_chain *chain;
2416 if (nla[NFTA_CHAIN_HOOK]) {
2417 struct nft_stats __percpu *stats = NULL;
2418 struct nft_chain_hook hook = {};
2420 if (flags & NFT_CHAIN_BINDING)
2423 err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
2428 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2429 if (basechain == NULL) {
2430 nft_chain_release_hook(&hook);
2433 chain = &basechain->chain;
2435 if (nla[NFTA_CHAIN_COUNTERS]) {
2436 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2437 if (IS_ERR(stats)) {
2438 nft_chain_release_hook(&hook);
2440 return PTR_ERR(stats);
2442 rcu_assign_pointer(basechain->stats, stats);
2445 err = nft_basechain_init(basechain, family, &hook, flags);
2447 nft_chain_release_hook(&hook);
2453 static_branch_inc(&nft_counters_enabled);
2455 if (flags & NFT_CHAIN_BASE)
2457 if (flags & NFT_CHAIN_HW_OFFLOAD)
2460 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2464 chain->flags = flags;
2468 INIT_LIST_HEAD(&chain->rules);
2469 chain->handle = nf_tables_alloc_handle(table);
2470 chain->table = table;
2472 if (nla[NFTA_CHAIN_NAME]) {
2473 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2475 if (!(flags & NFT_CHAIN_BINDING)) {
2477 goto err_destroy_chain;
2480 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2481 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2486 goto err_destroy_chain;
2489 if (nla[NFTA_CHAIN_USERDATA]) {
2490 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2491 if (chain->udata == NULL) {
2493 goto err_destroy_chain;
2495 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2498 blob = nf_tables_chain_alloc_rules(chain, 0);
2501 goto err_destroy_chain;
2504 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2505 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2507 err = nf_tables_register_hook(net, table, chain);
2509 goto err_destroy_chain;
2511 if (!nft_use_inc(&table->use)) {
2516 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2517 if (IS_ERR(trans)) {
2518 err = PTR_ERR(trans);
2519 goto err_unregister_hook;
2522 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2523 if (nft_is_base_chain(chain))
2524 nft_trans_chain_policy(trans) = policy;
2526 err = nft_chain_add(table, chain);
2528 nft_trans_destroy(trans);
2529 goto err_unregister_hook;
2534 err_unregister_hook:
2535 nft_use_dec_restore(&table->use);
2537 nf_tables_unregister_hook(net, table, chain);
2539 nf_tables_chain_destroy(ctx);
2544 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2545 u32 flags, const struct nlattr *attr,
2546 struct netlink_ext_ack *extack)
2548 const struct nlattr * const *nla = ctx->nla;
2549 struct nft_base_chain *basechain = NULL;
2550 struct nft_table *table = ctx->table;
2551 struct nft_chain *chain = ctx->chain;
2552 struct nft_chain_hook hook = {};
2553 struct nft_stats *stats = NULL;
2554 struct nft_hook *h, *next;
2555 struct nf_hook_ops *ops;
2556 struct nft_trans *trans;
2557 bool unregister = false;
2560 if (chain->flags ^ flags)
2563 INIT_LIST_HEAD(&hook.list);
2565 if (nla[NFTA_CHAIN_HOOK]) {
2566 if (!nft_is_base_chain(chain)) {
2567 NL_SET_BAD_ATTR(extack, attr);
2571 basechain = nft_base_chain(chain);
2572 err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
2573 ctx->family, flags, extack);
2577 if (basechain->type != hook.type) {
2578 nft_chain_release_hook(&hook);
2579 NL_SET_BAD_ATTR(extack, attr);
2583 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2584 list_for_each_entry_safe(h, next, &hook.list, list) {
2585 h->ops.pf = basechain->ops.pf;
2586 h->ops.hooknum = basechain->ops.hooknum;
2587 h->ops.priority = basechain->ops.priority;
2588 h->ops.priv = basechain->ops.priv;
2589 h->ops.hook = basechain->ops.hook;
2591 if (nft_hook_list_find(&basechain->hook_list, h)) {
2597 ops = &basechain->ops;
2598 if (ops->hooknum != hook.num ||
2599 ops->priority != hook.priority) {
2600 nft_chain_release_hook(&hook);
2601 NL_SET_BAD_ATTR(extack, attr);
2607 if (nla[NFTA_CHAIN_HANDLE] &&
2608 nla[NFTA_CHAIN_NAME]) {
2609 struct nft_chain *chain2;
2611 chain2 = nft_chain_lookup(ctx->net, table,
2612 nla[NFTA_CHAIN_NAME], genmask);
2613 if (!IS_ERR(chain2)) {
2614 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2620 if (nla[NFTA_CHAIN_COUNTERS]) {
2621 if (!nft_is_base_chain(chain)) {
2626 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2627 if (IS_ERR(stats)) {
2628 err = PTR_ERR(stats);
2633 if (!(table->flags & NFT_TABLE_F_DORMANT) &&
2634 nft_is_base_chain(chain) &&
2635 !list_empty(&hook.list)) {
2636 basechain = nft_base_chain(chain);
2637 ops = &basechain->ops;
2639 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
2640 err = nft_netdev_register_hooks(ctx->net, &hook.list);
2648 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2649 sizeof(struct nft_trans_chain));
2653 nft_trans_chain_stats(trans) = stats;
2654 nft_trans_chain_update(trans) = true;
2656 if (nla[NFTA_CHAIN_POLICY])
2657 nft_trans_chain_policy(trans) = policy;
2659 nft_trans_chain_policy(trans) = -1;
2661 if (nla[NFTA_CHAIN_HANDLE] &&
2662 nla[NFTA_CHAIN_NAME]) {
2663 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2664 struct nft_trans *tmp;
2668 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2673 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2674 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2675 tmp->ctx.table == table &&
2676 nft_trans_chain_update(tmp) &&
2677 nft_trans_chain_name(tmp) &&
2678 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2679 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2685 nft_trans_chain_name(trans) = name;
2688 nft_trans_basechain(trans) = basechain;
2689 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2690 list_splice(&hook.list, &nft_trans_chain_hooks(trans));
2691 if (nla[NFTA_CHAIN_HOOK])
2692 module_put(hook.type->owner);
2694 nft_trans_commit_list_add_tail(ctx->net, trans);
2702 if (nla[NFTA_CHAIN_HOOK]) {
2703 list_for_each_entry_safe(h, next, &hook.list, list) {
2705 nf_unregister_net_hook(ctx->net, &h->ops);
2709 module_put(hook.type->owner);
2715 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2716 const struct nft_table *table,
2717 const struct nlattr *nla, u8 genmask)
2719 struct nftables_pernet *nft_net = nft_pernet(net);
2720 u32 id = ntohl(nla_get_be32(nla));
2721 struct nft_trans *trans;
2723 list_for_each_entry(trans, &nft_net->commit_list, list) {
2724 struct nft_chain *chain = trans->ctx.chain;
2726 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2727 chain->table == table &&
2728 id == nft_trans_chain_id(trans) &&
2729 nft_active_genmask(chain, genmask))
2732 return ERR_PTR(-ENOENT);
2735 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2736 const struct nlattr * const nla[])
2738 struct nftables_pernet *nft_net = nft_pernet(info->net);
2739 struct netlink_ext_ack *extack = info->extack;
2740 u8 genmask = nft_genmask_next(info->net);
2741 u8 family = info->nfmsg->nfgen_family;
2742 struct nft_chain *chain = NULL;
2743 struct net *net = info->net;
2744 const struct nlattr *attr;
2745 struct nft_table *table;
2746 u8 policy = NF_ACCEPT;
2751 lockdep_assert_held(&nft_net->commit_mutex);
2753 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2754 NETLINK_CB(skb).portid);
2755 if (IS_ERR(table)) {
2756 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2757 return PTR_ERR(table);
2761 attr = nla[NFTA_CHAIN_NAME];
2763 if (nla[NFTA_CHAIN_HANDLE]) {
2764 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2765 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2766 if (IS_ERR(chain)) {
2767 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2768 return PTR_ERR(chain);
2770 attr = nla[NFTA_CHAIN_HANDLE];
2771 } else if (nla[NFTA_CHAIN_NAME]) {
2772 chain = nft_chain_lookup(net, table, attr, genmask);
2773 if (IS_ERR(chain)) {
2774 if (PTR_ERR(chain) != -ENOENT) {
2775 NL_SET_BAD_ATTR(extack, attr);
2776 return PTR_ERR(chain);
2780 } else if (!nla[NFTA_CHAIN_ID]) {
2784 if (nla[NFTA_CHAIN_POLICY]) {
2785 if (chain != NULL &&
2786 !nft_is_base_chain(chain)) {
2787 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2791 if (chain == NULL &&
2792 nla[NFTA_CHAIN_HOOK] == NULL) {
2793 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2797 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2807 if (nla[NFTA_CHAIN_FLAGS])
2808 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2810 flags = chain->flags;
2812 if (flags & ~NFT_CHAIN_FLAGS)
2815 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2817 if (chain != NULL) {
2818 if (chain->flags & NFT_CHAIN_BINDING)
2821 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2822 NL_SET_BAD_ATTR(extack, attr);
2825 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2828 flags |= chain->flags & NFT_CHAIN_BASE;
2829 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2833 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2836 static int nft_delchain_hook(struct nft_ctx *ctx,
2837 struct nft_base_chain *basechain,
2838 struct netlink_ext_ack *extack)
2840 const struct nft_chain *chain = &basechain->chain;
2841 const struct nlattr * const *nla = ctx->nla;
2842 struct nft_chain_hook chain_hook = {};
2843 struct nft_hook *this, *hook;
2844 LIST_HEAD(chain_del_list);
2845 struct nft_trans *trans;
2848 err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
2849 ctx->family, chain->flags, extack);
2853 list_for_each_entry(this, &chain_hook.list, list) {
2854 hook = nft_hook_list_find(&basechain->hook_list, this);
2857 goto err_chain_del_hook;
2859 list_move(&hook->list, &chain_del_list);
2862 trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
2863 sizeof(struct nft_trans_chain));
2866 goto err_chain_del_hook;
2869 nft_trans_basechain(trans) = basechain;
2870 nft_trans_chain_update(trans) = true;
2871 INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
2872 list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
2873 nft_chain_release_hook(&chain_hook);
2875 nft_trans_commit_list_add_tail(ctx->net, trans);
2880 list_splice(&chain_del_list, &basechain->hook_list);
2881 nft_chain_release_hook(&chain_hook);
2886 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2887 const struct nlattr * const nla[])
2889 struct netlink_ext_ack *extack = info->extack;
2890 u8 genmask = nft_genmask_next(info->net);
2891 u8 family = info->nfmsg->nfgen_family;
2892 struct net *net = info->net;
2893 const struct nlattr *attr;
2894 struct nft_table *table;
2895 struct nft_chain *chain;
2896 struct nft_rule *rule;
2902 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2903 NETLINK_CB(skb).portid);
2904 if (IS_ERR(table)) {
2905 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2906 return PTR_ERR(table);
2909 if (nla[NFTA_CHAIN_HANDLE]) {
2910 attr = nla[NFTA_CHAIN_HANDLE];
2911 handle = be64_to_cpu(nla_get_be64(attr));
2912 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2914 attr = nla[NFTA_CHAIN_NAME];
2915 chain = nft_chain_lookup(net, table, attr, genmask);
2917 if (IS_ERR(chain)) {
2918 if (PTR_ERR(chain) == -ENOENT &&
2919 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYCHAIN)
2922 NL_SET_BAD_ATTR(extack, attr);
2923 return PTR_ERR(chain);
2926 if (nft_chain_binding(chain))
2929 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2931 if (nla[NFTA_CHAIN_HOOK]) {
2932 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
2935 if (nft_is_base_chain(chain)) {
2936 struct nft_base_chain *basechain = nft_base_chain(chain);
2938 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
2939 return nft_delchain_hook(&ctx, basechain, extack);
2943 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2948 list_for_each_entry(rule, &chain->rules, list) {
2949 if (!nft_is_active_next(net, rule))
2953 err = nft_delrule(&ctx, rule);
2958 /* There are rules and elements that are still holding references to us,
2959 * we cannot do a recursive removal in this case.
2962 NL_SET_BAD_ATTR(extack, attr);
2966 return nft_delchain(&ctx);
2974 * nft_register_expr - register nf_tables expr type
2977 * Registers the expr type for use with nf_tables. Returns zero on
2978 * success or a negative errno code otherwise.
2980 int nft_register_expr(struct nft_expr_type *type)
2982 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2983 if (type->family == NFPROTO_UNSPEC)
2984 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2986 list_add_rcu(&type->list, &nf_tables_expressions);
2987 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2990 EXPORT_SYMBOL_GPL(nft_register_expr);
2993 * nft_unregister_expr - unregister nf_tables expr type
2996 * Unregisters the expr typefor use with nf_tables.
2998 void nft_unregister_expr(struct nft_expr_type *type)
3000 nfnl_lock(NFNL_SUBSYS_NFTABLES);
3001 list_del_rcu(&type->list);
3002 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
3004 EXPORT_SYMBOL_GPL(nft_unregister_expr);
3006 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
3009 const struct nft_expr_type *type, *candidate = NULL;
3011 list_for_each_entry(type, &nf_tables_expressions, list) {
3012 if (!nla_strcmp(nla, type->name)) {
3013 if (!type->family && !candidate)
3015 else if (type->family == family)
3022 #ifdef CONFIG_MODULES
3023 static int nft_expr_type_request_module(struct net *net, u8 family,
3026 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
3027 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
3034 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
3038 const struct nft_expr_type *type;
3041 return ERR_PTR(-EINVAL);
3043 type = __nft_expr_type_get(family, nla);
3044 if (type != NULL && try_module_get(type->owner))
3047 lockdep_nfnl_nft_mutex_not_held();
3048 #ifdef CONFIG_MODULES
3050 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
3051 return ERR_PTR(-EAGAIN);
3053 if (nft_request_module(net, "nft-expr-%.*s",
3055 (char *)nla_data(nla)) == -EAGAIN)
3056 return ERR_PTR(-EAGAIN);
3059 return ERR_PTR(-ENOENT);
3062 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
3063 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
3064 .len = NFT_MODULE_AUTOLOAD_LIMIT },
3065 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
3068 static int nf_tables_fill_expr_info(struct sk_buff *skb,
3069 const struct nft_expr *expr, bool reset)
3071 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
3072 goto nla_put_failure;
3074 if (expr->ops->dump) {
3075 struct nlattr *data = nla_nest_start_noflag(skb,
3078 goto nla_put_failure;
3079 if (expr->ops->dump(skb, expr, reset) < 0)
3080 goto nla_put_failure;
3081 nla_nest_end(skb, data);
3090 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
3091 const struct nft_expr *expr, bool reset)
3093 struct nlattr *nest;
3095 nest = nla_nest_start_noflag(skb, attr);
3097 goto nla_put_failure;
3098 if (nf_tables_fill_expr_info(skb, expr, reset) < 0)
3099 goto nla_put_failure;
3100 nla_nest_end(skb, nest);
3107 struct nft_expr_info {
3108 const struct nft_expr_ops *ops;
3109 const struct nlattr *attr;
3110 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
3113 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
3114 const struct nlattr *nla,
3115 struct nft_expr_info *info)
3117 const struct nft_expr_type *type;
3118 const struct nft_expr_ops *ops;
3119 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3122 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3123 nft_expr_policy, NULL);
3127 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
3129 return PTR_ERR(type);
3131 if (tb[NFTA_EXPR_DATA]) {
3132 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3134 type->policy, NULL);
3138 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
3140 if (type->select_ops != NULL) {
3141 ops = type->select_ops(ctx,
3142 (const struct nlattr * const *)info->tb);
3145 #ifdef CONFIG_MODULES
3147 if (nft_expr_type_request_module(ctx->net,
3149 tb[NFTA_EXPR_NAME]) != -EAGAIN)
3163 module_put(type->owner);
3167 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
3168 struct nft_expr_info *info)
3170 struct nlattr *tb[NFTA_EXPR_MAX + 1];
3171 const struct nft_expr_type *type;
3174 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
3175 nft_expr_policy, NULL);
3179 if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME])
3182 type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]);
3186 if (!type->inner_ops)
3189 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
3191 type->policy, NULL);
3196 info->ops = type->inner_ops;
3204 static int nf_tables_newexpr(const struct nft_ctx *ctx,
3205 const struct nft_expr_info *expr_info,
3206 struct nft_expr *expr)
3208 const struct nft_expr_ops *ops = expr_info->ops;
3213 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3224 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3225 struct nft_expr *expr)
3227 const struct nft_expr_type *type = expr->ops->type;
3229 if (expr->ops->destroy)
3230 expr->ops->destroy(ctx, expr);
3231 module_put(type->owner);
3234 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3235 const struct nlattr *nla)
3237 struct nft_expr_info expr_info;
3238 struct nft_expr *expr;
3239 struct module *owner;
3242 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3244 goto err_expr_parse;
3247 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3248 goto err_expr_stateful;
3251 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3253 goto err_expr_stateful;
3255 err = nf_tables_newexpr(ctx, &expr_info, expr);
3263 owner = expr_info.ops->type->owner;
3264 if (expr_info.ops->type->release_ops)
3265 expr_info.ops->type->release_ops(expr_info.ops);
3269 return ERR_PTR(err);
3272 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3276 if (src->ops->clone) {
3277 dst->ops = src->ops;
3278 err = src->ops->clone(dst, src);
3282 memcpy(dst, src, src->ops->size);
3285 __module_get(src->ops->type->owner);
3290 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3292 nf_tables_expr_destroy(ctx, expr);
3300 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3303 struct nft_rule *rule;
3305 // FIXME: this sucks
3306 list_for_each_entry_rcu(rule, &chain->rules, list) {
3307 if (handle == rule->handle)
3311 return ERR_PTR(-ENOENT);
3314 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3315 const struct nlattr *nla)
3318 return ERR_PTR(-EINVAL);
3320 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3323 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3324 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3325 .len = NFT_TABLE_MAXNAMELEN - 1 },
3326 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3327 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3328 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3329 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3330 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3331 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3332 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3333 .len = NFT_USERDATA_MAXLEN },
3334 [NFTA_RULE_ID] = { .type = NLA_U32 },
3335 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3336 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3339 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3340 u32 portid, u32 seq, int event,
3341 u32 flags, int family,
3342 const struct nft_table *table,
3343 const struct nft_chain *chain,
3344 const struct nft_rule *rule, u64 handle,
3347 struct nlmsghdr *nlh;
3348 const struct nft_expr *expr, *next;
3349 struct nlattr *list;
3350 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3352 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3355 goto nla_put_failure;
3357 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3358 goto nla_put_failure;
3359 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3360 goto nla_put_failure;
3361 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3363 goto nla_put_failure;
3365 if (event != NFT_MSG_DELRULE && handle) {
3366 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3368 goto nla_put_failure;
3371 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3372 nft_flow_rule_stats(chain, rule);
3374 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3376 goto nla_put_failure;
3377 nft_rule_for_each_expr(expr, next, rule) {
3378 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
3379 goto nla_put_failure;
3381 nla_nest_end(skb, list);
3384 struct nft_userdata *udata = nft_userdata(rule);
3385 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3387 goto nla_put_failure;
3390 nlmsg_end(skb, nlh);
3394 nlmsg_trim(skb, nlh);
3398 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3399 const struct nft_rule *rule, int event)
3401 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3402 const struct nft_rule *prule;
3403 struct sk_buff *skb;
3409 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3412 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3416 if (event == NFT_MSG_NEWRULE &&
3417 !list_is_first(&rule->list, &ctx->chain->rules) &&
3418 !list_is_last(&rule->list, &ctx->chain->rules)) {
3419 prule = list_prev_entry(rule, list);
3420 handle = prule->handle;
3422 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3423 flags |= NLM_F_APPEND;
3424 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3425 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3427 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3428 event, flags, ctx->family, ctx->table,
3429 ctx->chain, rule, handle, false);
3435 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3438 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3441 static void audit_log_rule_reset(const struct nft_table *table,
3442 unsigned int base_seq,
3443 unsigned int nentries)
3445 char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
3446 table->name, base_seq);
3448 audit_log_nfcfg(buf, table->family, nentries,
3449 AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
3453 struct nft_rule_dump_ctx {
3458 static int __nf_tables_dump_rules(struct sk_buff *skb,
3460 struct netlink_callback *cb,
3461 const struct nft_table *table,
3462 const struct nft_chain *chain,
3465 struct net *net = sock_net(skb->sk);
3466 const struct nft_rule *rule, *prule;
3467 unsigned int s_idx = cb->args[0];
3468 unsigned int entries = 0;
3473 list_for_each_entry_rcu(rule, &chain->rules, list) {
3474 if (!nft_is_active(net, rule))
3479 handle = prule->handle;
3483 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3486 NLM_F_MULTI | NLM_F_APPEND,
3488 table, chain, rule, handle, reset) < 0) {
3493 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3500 if (reset && entries)
3501 audit_log_rule_reset(table, cb->seq, entries);
3506 static int nf_tables_dump_rules(struct sk_buff *skb,
3507 struct netlink_callback *cb)
3509 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3510 const struct nft_rule_dump_ctx *ctx = cb->data;
3511 struct nft_table *table;
3512 const struct nft_chain *chain;
3513 unsigned int idx = 0;
3514 struct net *net = sock_net(skb->sk);
3515 int family = nfmsg->nfgen_family;
3516 struct nftables_pernet *nft_net;
3519 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3523 nft_net = nft_pernet(net);
3524 cb->seq = READ_ONCE(nft_net->base_seq);
3526 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3527 if (family != NFPROTO_UNSPEC && family != table->family)
3530 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3533 if (ctx && ctx->table && ctx->chain) {
3534 struct rhlist_head *list, *tmp;
3536 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3537 nft_chain_ht_params);
3541 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3542 if (!nft_is_active(net, chain))
3544 __nf_tables_dump_rules(skb, &idx,
3545 cb, table, chain, reset);
3551 list_for_each_entry_rcu(chain, &table->chains, list) {
3552 if (__nf_tables_dump_rules(skb, &idx,
3553 cb, table, chain, reset))
3557 if (ctx && ctx->table)
3567 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3569 const struct nlattr * const *nla = cb->data;
3570 struct nft_rule_dump_ctx *ctx = NULL;
3572 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3573 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3577 if (nla[NFTA_RULE_TABLE]) {
3578 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3585 if (nla[NFTA_RULE_CHAIN]) {
3586 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3600 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3602 struct nft_rule_dump_ctx *ctx = cb->data;
3612 /* called with rcu_read_lock held */
3613 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3614 const struct nlattr * const nla[])
3616 struct netlink_ext_ack *extack = info->extack;
3617 u8 genmask = nft_genmask_cur(info->net);
3618 u8 family = info->nfmsg->nfgen_family;
3619 const struct nft_chain *chain;
3620 const struct nft_rule *rule;
3621 struct net *net = info->net;
3622 struct nft_table *table;
3623 struct sk_buff *skb2;
3627 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3628 struct netlink_dump_control c = {
3629 .start= nf_tables_dump_rules_start,
3630 .dump = nf_tables_dump_rules,
3631 .done = nf_tables_dump_rules_done,
3632 .module = THIS_MODULE,
3633 .data = (void *)nla,
3636 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3639 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3640 if (IS_ERR(table)) {
3641 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3642 return PTR_ERR(table);
3645 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3646 if (IS_ERR(chain)) {
3647 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3648 return PTR_ERR(chain);
3651 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3653 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3654 return PTR_ERR(rule);
3657 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3661 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETRULE_RESET)
3664 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3665 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3666 family, table, chain, rule, 0, reset);
3668 goto err_fill_rule_info;
3671 audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
3673 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3680 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3682 struct nft_expr *expr, *next;
3685 * Careful: some expressions might not be initialized in case this
3686 * is called on error from nf_tables_newrule().
3688 expr = nft_expr_first(rule);
3689 while (nft_expr_more(rule, expr)) {
3690 next = nft_expr_next(expr);
3691 nf_tables_expr_destroy(ctx, expr);
3697 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3699 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3700 nf_tables_rule_destroy(ctx, rule);
3703 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3705 struct nft_expr *expr, *last;
3706 const struct nft_data *data;
3707 struct nft_rule *rule;
3710 if (ctx->level == NFT_JUMP_STACK_SIZE)
3713 list_for_each_entry(rule, &chain->rules, list) {
3714 if (fatal_signal_pending(current))
3717 if (!nft_is_active_next(ctx->net, rule))
3720 nft_rule_for_each_expr(expr, last, rule) {
3721 if (!expr->ops->validate)
3724 err = expr->ops->validate(ctx, expr, &data);
3732 EXPORT_SYMBOL_GPL(nft_chain_validate);
3734 static int nft_table_validate(struct net *net, const struct nft_table *table)
3736 struct nft_chain *chain;
3737 struct nft_ctx ctx = {
3739 .family = table->family,
3743 list_for_each_entry(chain, &table->chains, list) {
3744 if (!nft_is_base_chain(chain))
3748 err = nft_chain_validate(&ctx, chain);
3758 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3759 const struct nft_set_iter *iter,
3760 struct nft_set_elem *elem)
3762 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3763 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3764 const struct nft_data *data;
3767 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3768 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3771 data = nft_set_ext_data(ext);
3772 switch (data->verdict.code) {
3776 err = nft_chain_validate(ctx, data->verdict.chain);
3788 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3790 u8 genmask = nft_genmask_next(ctx->net);
3791 struct nft_set_elem_catchall *catchall;
3792 struct nft_set_elem elem;
3793 struct nft_set_ext *ext;
3796 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3797 ext = nft_set_elem_ext(set, catchall->elem);
3798 if (!nft_set_elem_active(ext, genmask))
3801 elem.priv = catchall->elem;
3802 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3810 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3811 const struct nft_chain *chain,
3812 const struct nlattr *nla);
3814 #define NFT_RULE_MAXEXPRS 128
3816 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3817 const struct nlattr * const nla[])
3819 struct nftables_pernet *nft_net = nft_pernet(info->net);
3820 struct netlink_ext_ack *extack = info->extack;
3821 unsigned int size, i, n, ulen = 0, usize = 0;
3822 u8 genmask = nft_genmask_next(info->net);
3823 struct nft_rule *rule, *old_rule = NULL;
3824 struct nft_expr_info *expr_info = NULL;
3825 u8 family = info->nfmsg->nfgen_family;
3826 struct nft_flow_rule *flow = NULL;
3827 struct net *net = info->net;
3828 struct nft_userdata *udata;
3829 struct nft_table *table;
3830 struct nft_chain *chain;
3831 struct nft_trans *trans;
3832 u64 handle, pos_handle;
3833 struct nft_expr *expr;
3838 lockdep_assert_held(&nft_net->commit_mutex);
3840 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3841 NETLINK_CB(skb).portid);
3842 if (IS_ERR(table)) {
3843 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3844 return PTR_ERR(table);
3847 if (nla[NFTA_RULE_CHAIN]) {
3848 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3850 if (IS_ERR(chain)) {
3851 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3852 return PTR_ERR(chain);
3855 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3856 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID],
3858 if (IS_ERR(chain)) {
3859 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3860 return PTR_ERR(chain);
3866 if (nft_chain_is_bound(chain))
3869 if (nla[NFTA_RULE_HANDLE]) {
3870 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3871 rule = __nft_rule_lookup(chain, handle);
3873 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3874 return PTR_ERR(rule);
3877 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3878 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3881 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3886 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3887 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3889 handle = nf_tables_alloc_handle(table);
3891 if (nla[NFTA_RULE_POSITION]) {
3892 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3893 old_rule = __nft_rule_lookup(chain, pos_handle);
3894 if (IS_ERR(old_rule)) {
3895 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3896 return PTR_ERR(old_rule);
3898 } else if (nla[NFTA_RULE_POSITION_ID]) {
3899 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3900 if (IS_ERR(old_rule)) {
3901 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3902 return PTR_ERR(old_rule);
3907 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3911 if (nla[NFTA_RULE_EXPRESSIONS]) {
3912 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3913 sizeof(struct nft_expr_info),
3918 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3920 if (nla_type(tmp) != NFTA_LIST_ELEM)
3921 goto err_release_expr;
3922 if (n == NFT_RULE_MAXEXPRS)
3923 goto err_release_expr;
3924 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3926 NL_SET_BAD_ATTR(extack, tmp);
3927 goto err_release_expr;
3929 size += expr_info[n].ops->size;
3933 /* Check for overflow of dlen field */
3935 if (size >= 1 << 12)
3936 goto err_release_expr;
3938 if (nla[NFTA_RULE_USERDATA]) {
3939 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3941 usize = sizeof(struct nft_userdata) + ulen;
3945 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3947 goto err_release_expr;
3949 nft_activate_next(net, rule);
3951 rule->handle = handle;
3953 rule->udata = ulen ? 1 : 0;
3956 udata = nft_userdata(rule);
3957 udata->len = ulen - 1;
3958 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3961 expr = nft_expr_first(rule);
3962 for (i = 0; i < n; i++) {
3963 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3965 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3966 goto err_release_rule;
3969 if (expr_info[i].ops->validate)
3970 nft_validate_state_update(table, NFT_VALIDATE_NEED);
3972 expr_info[i].ops = NULL;
3973 expr = nft_expr_next(expr);
3976 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3977 flow = nft_flow_rule_create(net, rule);
3979 err = PTR_ERR(flow);
3980 goto err_release_rule;
3984 if (!nft_use_inc(&chain->use)) {
3986 goto err_release_rule;
3989 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3990 if (nft_chain_binding(chain)) {
3992 goto err_destroy_flow_rule;
3995 err = nft_delrule(&ctx, old_rule);
3997 goto err_destroy_flow_rule;
3999 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4000 if (trans == NULL) {
4002 goto err_destroy_flow_rule;
4004 list_add_tail_rcu(&rule->list, &old_rule->list);
4006 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
4009 goto err_destroy_flow_rule;
4012 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
4014 list_add_rcu(&rule->list, &old_rule->list);
4016 list_add_tail_rcu(&rule->list, &chain->rules);
4019 list_add_tail_rcu(&rule->list, &old_rule->list);
4021 list_add_rcu(&rule->list, &chain->rules);
4027 nft_trans_flow_rule(trans) = flow;
4029 if (table->validate_state == NFT_VALIDATE_DO)
4030 return nft_table_validate(net, table);
4034 err_destroy_flow_rule:
4035 nft_use_dec_restore(&chain->use);
4037 nft_flow_rule_destroy(flow);
4039 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
4040 nf_tables_rule_destroy(&ctx, rule);
4042 for (i = 0; i < n; i++) {
4043 if (expr_info[i].ops) {
4044 module_put(expr_info[i].ops->type->owner);
4045 if (expr_info[i].ops->type->release_ops)
4046 expr_info[i].ops->type->release_ops(expr_info[i].ops);
4054 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
4055 const struct nft_chain *chain,
4056 const struct nlattr *nla)
4058 struct nftables_pernet *nft_net = nft_pernet(net);
4059 u32 id = ntohl(nla_get_be32(nla));
4060 struct nft_trans *trans;
4062 list_for_each_entry(trans, &nft_net->commit_list, list) {
4063 if (trans->msg_type == NFT_MSG_NEWRULE &&
4064 trans->ctx.chain == chain &&
4065 id == nft_trans_rule_id(trans))
4066 return nft_trans_rule(trans);
4068 return ERR_PTR(-ENOENT);
4071 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
4072 const struct nlattr * const nla[])
4074 struct netlink_ext_ack *extack = info->extack;
4075 u8 genmask = nft_genmask_next(info->net);
4076 u8 family = info->nfmsg->nfgen_family;
4077 struct nft_chain *chain = NULL;
4078 struct net *net = info->net;
4079 struct nft_table *table;
4080 struct nft_rule *rule;
4084 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
4085 NETLINK_CB(skb).portid);
4086 if (IS_ERR(table)) {
4087 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
4088 return PTR_ERR(table);
4091 if (nla[NFTA_RULE_CHAIN]) {
4092 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
4094 if (IS_ERR(chain)) {
4095 if (PTR_ERR(chain) == -ENOENT &&
4096 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4099 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
4100 return PTR_ERR(chain);
4102 if (nft_chain_binding(chain))
4106 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
4109 if (nla[NFTA_RULE_HANDLE]) {
4110 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
4112 if (PTR_ERR(rule) == -ENOENT &&
4113 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
4116 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
4117 return PTR_ERR(rule);
4120 err = nft_delrule(&ctx, rule);
4121 } else if (nla[NFTA_RULE_ID]) {
4122 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
4124 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
4125 return PTR_ERR(rule);
4128 err = nft_delrule(&ctx, rule);
4130 err = nft_delrule_by_chain(&ctx);
4133 list_for_each_entry(chain, &table->chains, list) {
4134 if (!nft_is_active_next(net, chain))
4136 if (nft_chain_binding(chain))
4140 err = nft_delrule_by_chain(&ctx);
4152 static const struct nft_set_type *nft_set_types[] = {
4153 &nft_set_hash_fast_type,
4155 &nft_set_rhash_type,
4156 &nft_set_bitmap_type,
4157 &nft_set_rbtree_type,
4158 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
4159 &nft_set_pipapo_avx2_type,
4161 &nft_set_pipapo_type,
4164 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
4165 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
4168 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
4170 return (flags & type->features) == (flags & NFT_SET_FEATURES);
4174 * Select a set implementation based on the data characteristics and the
4175 * given policy. The total memory use might not be known if no size is
4176 * given, in that case the amount of memory per element is used.
4178 static const struct nft_set_ops *
4179 nft_select_set_ops(const struct nft_ctx *ctx,
4180 const struct nlattr * const nla[],
4181 const struct nft_set_desc *desc)
4183 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4184 const struct nft_set_ops *ops, *bops;
4185 struct nft_set_estimate est, best;
4186 const struct nft_set_type *type;
4190 lockdep_assert_held(&nft_net->commit_mutex);
4191 lockdep_nfnl_nft_mutex_not_held();
4193 if (nla[NFTA_SET_FLAGS] != NULL)
4194 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4201 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
4202 type = nft_set_types[i];
4205 if (!nft_set_ops_candidate(type, flags))
4207 if (!ops->estimate(desc, flags, &est))
4210 switch (desc->policy) {
4211 case NFT_SET_POL_PERFORMANCE:
4212 if (est.lookup < best.lookup)
4214 if (est.lookup == best.lookup &&
4215 est.space < best.space)
4218 case NFT_SET_POL_MEMORY:
4220 if (est.space < best.space)
4222 if (est.space == best.space &&
4223 est.lookup < best.lookup)
4225 } else if (est.size < best.size || !bops) {
4240 return ERR_PTR(-EOPNOTSUPP);
4243 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
4244 [NFTA_SET_TABLE] = { .type = NLA_STRING,
4245 .len = NFT_TABLE_MAXNAMELEN - 1 },
4246 [NFTA_SET_NAME] = { .type = NLA_STRING,
4247 .len = NFT_SET_MAXNAMELEN - 1 },
4248 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
4249 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
4250 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
4251 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
4252 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
4253 [NFTA_SET_POLICY] = { .type = NLA_U32 },
4254 [NFTA_SET_DESC] = { .type = NLA_NESTED },
4255 [NFTA_SET_ID] = { .type = NLA_U32 },
4256 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
4257 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
4258 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
4259 .len = NFT_USERDATA_MAXLEN },
4260 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
4261 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
4262 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
4263 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4266 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4267 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4268 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4271 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4272 const struct nlattr *nla, u8 genmask)
4274 struct nft_set *set;
4277 return ERR_PTR(-EINVAL);
4279 list_for_each_entry_rcu(set, &table->sets, list) {
4280 if (!nla_strcmp(nla, set->name) &&
4281 nft_active_genmask(set, genmask))
4284 return ERR_PTR(-ENOENT);
4287 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4288 const struct nlattr *nla,
4291 struct nft_set *set;
4293 list_for_each_entry(set, &table->sets, list) {
4294 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4295 nft_active_genmask(set, genmask))
4298 return ERR_PTR(-ENOENT);
4301 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4302 const struct nft_table *table,
4303 const struct nlattr *nla, u8 genmask)
4305 struct nftables_pernet *nft_net = nft_pernet(net);
4306 u32 id = ntohl(nla_get_be32(nla));
4307 struct nft_trans *trans;
4309 list_for_each_entry(trans, &nft_net->commit_list, list) {
4310 if (trans->msg_type == NFT_MSG_NEWSET) {
4311 struct nft_set *set = nft_trans_set(trans);
4313 if (id == nft_trans_set_id(trans) &&
4314 set->table == table &&
4315 nft_active_genmask(set, genmask))
4319 return ERR_PTR(-ENOENT);
4322 struct nft_set *nft_set_lookup_global(const struct net *net,
4323 const struct nft_table *table,
4324 const struct nlattr *nla_set_name,
4325 const struct nlattr *nla_set_id,
4328 struct nft_set *set;
4330 set = nft_set_lookup(table, nla_set_name, genmask);
4335 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4339 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4341 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4344 const struct nft_set *i;
4346 unsigned long *inuse;
4347 unsigned int n = 0, min = 0;
4349 p = strchr(name, '%');
4351 if (p[1] != 'd' || strchr(p + 2, '%'))
4354 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4358 list_for_each_entry(i, &ctx->table->sets, list) {
4361 if (!nft_is_active_next(ctx->net, i))
4363 if (!sscanf(i->name, name, &tmp))
4365 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4368 set_bit(tmp - min, inuse);
4371 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4372 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4373 min += BITS_PER_BYTE * PAGE_SIZE;
4374 memset(inuse, 0, PAGE_SIZE);
4377 free_page((unsigned long)inuse);
4380 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4384 list_for_each_entry(i, &ctx->table->sets, list) {
4385 if (!nft_is_active_next(ctx->net, i))
4387 if (!strcmp(set->name, i->name)) {
4396 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4398 u64 ms = be64_to_cpu(nla_get_be64(nla));
4399 u64 max = (u64)(~((u64)0));
4401 max = div_u64(max, NSEC_PER_MSEC);
4405 ms *= NSEC_PER_MSEC;
4406 *result = nsecs_to_jiffies64(ms);
4410 __be64 nf_jiffies64_to_msecs(u64 input)
4412 return cpu_to_be64(jiffies64_to_msecs(input));
4415 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4416 const struct nft_set *set)
4418 struct nlattr *concat, *field;
4421 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4425 for (i = 0; i < set->field_count; i++) {
4426 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4430 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4431 htonl(set->field_len[i])))
4434 nla_nest_end(skb, field);
4437 nla_nest_end(skb, concat);
4442 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4443 const struct nft_set *set, u16 event, u16 flags)
4445 u64 timeout = READ_ONCE(set->timeout);
4446 u32 gc_int = READ_ONCE(set->gc_int);
4447 u32 portid = ctx->portid;
4448 struct nlmsghdr *nlh;
4449 struct nlattr *nest;
4453 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4454 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4455 NFNETLINK_V0, nft_base_seq(ctx->net));
4457 goto nla_put_failure;
4459 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4460 goto nla_put_failure;
4461 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4462 goto nla_put_failure;
4463 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4465 goto nla_put_failure;
4467 if (event == NFT_MSG_DELSET) {
4468 nlmsg_end(skb, nlh);
4472 if (set->flags != 0)
4473 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4474 goto nla_put_failure;
4476 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4477 goto nla_put_failure;
4478 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4479 goto nla_put_failure;
4480 if (set->flags & NFT_SET_MAP) {
4481 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4482 goto nla_put_failure;
4483 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4484 goto nla_put_failure;
4486 if (set->flags & NFT_SET_OBJECT &&
4487 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4488 goto nla_put_failure;
4491 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4492 nf_jiffies64_to_msecs(timeout),
4494 goto nla_put_failure;
4496 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4497 goto nla_put_failure;
4499 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4500 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4501 goto nla_put_failure;
4505 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4506 goto nla_put_failure;
4508 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4510 goto nla_put_failure;
4512 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4513 goto nla_put_failure;
4515 if (set->field_count > 1 &&
4516 nf_tables_fill_set_concat(skb, set))
4517 goto nla_put_failure;
4519 nla_nest_end(skb, nest);
4521 if (set->num_exprs == 1) {
4522 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4523 if (nf_tables_fill_expr_info(skb, set->exprs[0], false) < 0)
4524 goto nla_put_failure;
4526 nla_nest_end(skb, nest);
4527 } else if (set->num_exprs > 1) {
4528 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4530 goto nla_put_failure;
4532 for (i = 0; i < set->num_exprs; i++) {
4533 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4534 set->exprs[i], false) < 0)
4535 goto nla_put_failure;
4537 nla_nest_end(skb, nest);
4540 nlmsg_end(skb, nlh);
4544 nlmsg_trim(skb, nlh);
4548 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4549 const struct nft_set *set, int event,
4552 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4553 u32 portid = ctx->portid;
4554 struct sk_buff *skb;
4559 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4562 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4566 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4567 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4569 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4575 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4578 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4581 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4583 const struct nft_set *set;
4584 unsigned int idx, s_idx = cb->args[0];
4585 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4586 struct net *net = sock_net(skb->sk);
4587 struct nft_ctx *ctx = cb->data, ctx_set;
4588 struct nftables_pernet *nft_net;
4594 nft_net = nft_pernet(net);
4595 cb->seq = READ_ONCE(nft_net->base_seq);
4597 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4598 if (ctx->family != NFPROTO_UNSPEC &&
4599 ctx->family != table->family)
4602 if (ctx->table && ctx->table != table)
4606 if (cur_table != table)
4612 list_for_each_entry_rcu(set, &table->sets, list) {
4615 if (!nft_is_active(net, set))
4619 ctx_set.table = table;
4620 ctx_set.family = table->family;
4622 if (nf_tables_fill_set(skb, &ctx_set, set,
4626 cb->args[2] = (unsigned long) table;
4629 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4642 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4644 struct nft_ctx *ctx_dump = NULL;
4646 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4647 if (ctx_dump == NULL)
4650 cb->data = ctx_dump;
4654 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4660 /* called with rcu_read_lock held */
4661 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4662 const struct nlattr * const nla[])
4664 struct netlink_ext_ack *extack = info->extack;
4665 u8 genmask = nft_genmask_cur(info->net);
4666 u8 family = info->nfmsg->nfgen_family;
4667 struct nft_table *table = NULL;
4668 struct net *net = info->net;
4669 const struct nft_set *set;
4670 struct sk_buff *skb2;
4674 if (nla[NFTA_SET_TABLE]) {
4675 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4677 if (IS_ERR(table)) {
4678 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4679 return PTR_ERR(table);
4683 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4685 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4686 struct netlink_dump_control c = {
4687 .start = nf_tables_dump_sets_start,
4688 .dump = nf_tables_dump_sets,
4689 .done = nf_tables_dump_sets_done,
4691 .module = THIS_MODULE,
4694 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4697 /* Only accept unspec with dump */
4698 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4699 return -EAFNOSUPPORT;
4700 if (!nla[NFTA_SET_TABLE])
4703 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4705 return PTR_ERR(set);
4707 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4711 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4713 goto err_fill_set_info;
4715 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4722 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4723 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4726 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4727 struct nft_set_desc *desc)
4729 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4733 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4736 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4737 nft_concat_policy, NULL);
4741 if (!tb[NFTA_SET_FIELD_LEN])
4744 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4745 if (!len || len > U8_MAX)
4748 desc->field_len[desc->field_count++] = len;
4753 static int nft_set_desc_concat(struct nft_set_desc *desc,
4754 const struct nlattr *nla)
4756 u32 num_regs = 0, key_num_regs = 0;
4757 struct nlattr *attr;
4760 nla_for_each_nested(attr, nla, rem) {
4761 if (nla_type(attr) != NFTA_LIST_ELEM)
4764 err = nft_set_desc_concat_parse(attr, desc);
4769 for (i = 0; i < desc->field_count; i++)
4770 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4772 key_num_regs = DIV_ROUND_UP(desc->klen, sizeof(u32));
4773 if (key_num_regs != num_regs)
4776 if (num_regs > NFT_REG32_COUNT)
4782 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4783 const struct nlattr *nla)
4785 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4788 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4789 nft_set_desc_policy, NULL);
4793 if (da[NFTA_SET_DESC_SIZE] != NULL)
4794 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4795 if (da[NFTA_SET_DESC_CONCAT])
4796 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4801 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4802 const struct nlattr * const *nla,
4803 struct nft_expr **exprs, int *num_exprs,
4806 struct nft_expr *expr;
4809 if (nla[NFTA_SET_EXPR]) {
4810 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4812 err = PTR_ERR(expr);
4813 goto err_set_expr_alloc;
4817 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4821 if (!(flags & NFT_SET_EXPR)) {
4823 goto err_set_expr_alloc;
4826 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4827 if (i == NFT_SET_EXPR_MAX) {
4829 goto err_set_expr_alloc;
4831 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4833 goto err_set_expr_alloc;
4835 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4837 err = PTR_ERR(expr);
4838 goto err_set_expr_alloc;
4848 for (i = 0; i < *num_exprs; i++)
4849 nft_expr_destroy(ctx, exprs[i]);
4854 static bool nft_set_is_same(const struct nft_set *set,
4855 const struct nft_set_desc *desc,
4856 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4860 if (set->ktype != desc->ktype ||
4861 set->dtype != desc->dtype ||
4862 set->flags != flags ||
4863 set->klen != desc->klen ||
4864 set->dlen != desc->dlen ||
4865 set->field_count != desc->field_count ||
4866 set->num_exprs != num_exprs)
4869 for (i = 0; i < desc->field_count; i++) {
4870 if (set->field_len[i] != desc->field_len[i])
4874 for (i = 0; i < num_exprs; i++) {
4875 if (set->exprs[i]->ops != exprs[i]->ops)
4882 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4883 const struct nlattr * const nla[])
4885 struct netlink_ext_ack *extack = info->extack;
4886 u8 genmask = nft_genmask_next(info->net);
4887 u8 family = info->nfmsg->nfgen_family;
4888 const struct nft_set_ops *ops;
4889 struct net *net = info->net;
4890 struct nft_set_desc desc;
4891 struct nft_table *table;
4892 unsigned char *udata;
4893 struct nft_set *set;
4903 if (nla[NFTA_SET_TABLE] == NULL ||
4904 nla[NFTA_SET_NAME] == NULL ||
4905 nla[NFTA_SET_KEY_LEN] == NULL ||
4906 nla[NFTA_SET_ID] == NULL)
4909 memset(&desc, 0, sizeof(desc));
4911 desc.ktype = NFT_DATA_VALUE;
4912 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4913 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4914 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4918 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4919 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4923 if (nla[NFTA_SET_FLAGS] != NULL) {
4924 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4925 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4926 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4927 NFT_SET_MAP | NFT_SET_EVAL |
4928 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4930 /* Only one of these operations is supported */
4931 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4932 (NFT_SET_MAP | NFT_SET_OBJECT))
4934 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4935 (NFT_SET_EVAL | NFT_SET_OBJECT))
4940 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4941 if (!(flags & NFT_SET_MAP))
4944 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4945 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4946 desc.dtype != NFT_DATA_VERDICT)
4949 if (desc.dtype != NFT_DATA_VERDICT) {
4950 if (nla[NFTA_SET_DATA_LEN] == NULL)
4952 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4953 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4956 desc.dlen = sizeof(struct nft_verdict);
4957 } else if (flags & NFT_SET_MAP)
4960 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4961 if (!(flags & NFT_SET_OBJECT))
4964 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4965 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4966 desc.objtype > NFT_OBJECT_MAX)
4968 } else if (flags & NFT_SET_OBJECT)
4971 desc.objtype = NFT_OBJECT_UNSPEC;
4974 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4975 if (!(flags & NFT_SET_TIMEOUT))
4978 if (flags & NFT_SET_ANONYMOUS)
4981 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4986 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4987 if (!(flags & NFT_SET_TIMEOUT))
4990 if (flags & NFT_SET_ANONYMOUS)
4993 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4996 desc.policy = NFT_SET_POL_PERFORMANCE;
4997 if (nla[NFTA_SET_POLICY] != NULL) {
4998 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4999 switch (desc.policy) {
5000 case NFT_SET_POL_PERFORMANCE:
5001 case NFT_SET_POL_MEMORY:
5008 if (nla[NFTA_SET_DESC] != NULL) {
5009 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
5013 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
5015 } else if (flags & NFT_SET_CONCAT) {
5019 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
5022 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
5023 NETLINK_CB(skb).portid);
5024 if (IS_ERR(table)) {
5025 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5026 return PTR_ERR(table);
5029 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5031 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
5033 if (PTR_ERR(set) != -ENOENT) {
5034 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5035 return PTR_ERR(set);
5038 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
5040 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
5041 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5044 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
5047 if (nft_set_is_anonymous(set))
5050 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
5055 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
5056 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
5060 for (i = 0; i < num_exprs; i++)
5061 nft_expr_destroy(&ctx, exprs[i]);
5066 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
5069 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
5072 ops = nft_select_set_ops(&ctx, nla, &desc);
5074 return PTR_ERR(ops);
5077 if (nla[NFTA_SET_USERDATA])
5078 udlen = nla_len(nla[NFTA_SET_USERDATA]);
5081 if (ops->privsize != NULL)
5082 size = ops->privsize(nla, &desc);
5083 alloc_size = sizeof(*set) + size + udlen;
5084 if (alloc_size < size || alloc_size > INT_MAX)
5087 if (!nft_use_inc(&table->use))
5090 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
5096 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
5102 err = nf_tables_set_alloc_name(&ctx, set, name);
5109 udata = set->data + size;
5110 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
5113 INIT_LIST_HEAD(&set->bindings);
5114 INIT_LIST_HEAD(&set->catchall_list);
5115 refcount_set(&set->refs, 1);
5117 write_pnet(&set->net, net);
5119 set->ktype = desc.ktype;
5120 set->klen = desc.klen;
5121 set->dtype = desc.dtype;
5122 set->objtype = desc.objtype;
5123 set->dlen = desc.dlen;
5125 set->size = desc.size;
5126 set->policy = desc.policy;
5129 set->timeout = desc.timeout;
5130 set->gc_int = desc.gc_int;
5132 set->field_count = desc.field_count;
5133 for (i = 0; i < desc.field_count; i++)
5134 set->field_len[i] = desc.field_len[i];
5136 err = ops->init(set, &desc, nla);
5140 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
5142 goto err_set_destroy;
5144 set->num_exprs = num_exprs;
5145 set->handle = nf_tables_alloc_handle(table);
5146 INIT_LIST_HEAD(&set->pending_update);
5148 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
5150 goto err_set_expr_alloc;
5152 list_add_tail_rcu(&set->list, &table->sets);
5157 for (i = 0; i < set->num_exprs; i++)
5158 nft_expr_destroy(&ctx, set->exprs[i]);
5160 ops->destroy(&ctx, set);
5166 nft_use_dec_restore(&table->use);
5171 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
5172 struct nft_set *set)
5174 struct nft_set_elem_catchall *next, *catchall;
5176 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5177 list_del_rcu(&catchall->list);
5178 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
5179 kfree_rcu(catchall, rcu);
5183 static void nft_set_put(struct nft_set *set)
5185 if (refcount_dec_and_test(&set->refs)) {
5191 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
5195 if (WARN_ON(set->use > 0))
5198 for (i = 0; i < set->num_exprs; i++)
5199 nft_expr_destroy(ctx, set->exprs[i]);
5201 set->ops->destroy(ctx, set);
5202 nft_set_catchall_destroy(ctx, set);
5206 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
5207 const struct nlattr * const nla[])
5209 struct netlink_ext_ack *extack = info->extack;
5210 u8 genmask = nft_genmask_next(info->net);
5211 u8 family = info->nfmsg->nfgen_family;
5212 struct net *net = info->net;
5213 const struct nlattr *attr;
5214 struct nft_table *table;
5215 struct nft_set *set;
5218 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
5219 return -EAFNOSUPPORT;
5221 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
5222 genmask, NETLINK_CB(skb).portid);
5223 if (IS_ERR(table)) {
5224 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
5225 return PTR_ERR(table);
5228 if (nla[NFTA_SET_HANDLE]) {
5229 attr = nla[NFTA_SET_HANDLE];
5230 set = nft_set_lookup_byhandle(table, attr, genmask);
5232 attr = nla[NFTA_SET_NAME];
5233 set = nft_set_lookup(table, attr, genmask);
5237 if (PTR_ERR(set) == -ENOENT &&
5238 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSET)
5241 NL_SET_BAD_ATTR(extack, attr);
5242 return PTR_ERR(set);
5245 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
5246 atomic_read(&set->nelems) > 0)) {
5247 NL_SET_BAD_ATTR(extack, attr);
5251 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5253 return nft_delset(&ctx, set);
5256 static int nft_validate_register_store(const struct nft_ctx *ctx,
5257 enum nft_registers reg,
5258 const struct nft_data *data,
5259 enum nft_data_types type,
5262 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
5263 struct nft_set *set,
5264 struct nft_set_elem *elem)
5266 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5267 enum nft_registers dreg;
5269 dreg = nft_type_to_reg(set->dtype);
5270 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
5271 set->dtype == NFT_DATA_VERDICT ?
5272 NFT_DATA_VERDICT : NFT_DATA_VALUE,
5276 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
5277 struct nft_set *set,
5278 const struct nft_set_iter *iter,
5279 struct nft_set_elem *elem)
5281 return nft_setelem_data_validate(ctx, set, elem);
5284 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
5285 struct nft_set *set)
5287 u8 genmask = nft_genmask_next(ctx->net);
5288 struct nft_set_elem_catchall *catchall;
5289 struct nft_set_elem elem;
5290 struct nft_set_ext *ext;
5293 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5294 ext = nft_set_elem_ext(set, catchall->elem);
5295 if (!nft_set_elem_active(ext, genmask))
5298 elem.priv = catchall->elem;
5299 ret = nft_setelem_data_validate(ctx, set, &elem);
5307 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
5308 struct nft_set_binding *binding)
5310 struct nft_set_binding *i;
5311 struct nft_set_iter iter;
5313 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5316 if (binding->flags & NFT_SET_MAP) {
5317 /* If the set is already bound to the same chain all
5318 * jumps are already validated for that chain.
5320 list_for_each_entry(i, &set->bindings, list) {
5321 if (i->flags & NFT_SET_MAP &&
5322 i->chain == binding->chain)
5326 iter.genmask = nft_genmask_next(ctx->net);
5330 iter.fn = nf_tables_bind_check_setelem;
5332 set->ops->walk(ctx, set, &iter);
5334 iter.err = nft_set_catchall_bind_check(ctx, set);
5340 if (!nft_use_inc(&set->use))
5343 binding->chain = ctx->chain;
5344 list_add_tail_rcu(&binding->list, &set->bindings);
5345 nft_set_trans_bind(ctx, set);
5349 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5351 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5352 struct nft_set_binding *binding, bool event)
5354 list_del_rcu(&binding->list);
5356 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5357 list_del_rcu(&set->list);
5359 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5364 static void nft_setelem_data_activate(const struct net *net,
5365 const struct nft_set *set,
5366 struct nft_set_elem *elem);
5368 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5369 struct nft_set *set,
5370 const struct nft_set_iter *iter,
5371 struct nft_set_elem *elem)
5373 nft_setelem_data_activate(ctx->net, set, elem);
5378 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5379 struct nft_set *set)
5381 u8 genmask = nft_genmask_next(ctx->net);
5382 struct nft_set_elem_catchall *catchall;
5383 struct nft_set_elem elem;
5384 struct nft_set_ext *ext;
5386 list_for_each_entry(catchall, &set->catchall_list, list) {
5387 ext = nft_set_elem_ext(set, catchall->elem);
5388 if (!nft_set_elem_active(ext, genmask))
5391 elem.priv = catchall->elem;
5392 nft_setelem_data_activate(ctx->net, set, &elem);
5397 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5399 struct nft_set_iter iter = {
5400 .genmask = nft_genmask_next(ctx->net),
5401 .fn = nft_mapelem_activate,
5404 set->ops->walk(ctx, set, &iter);
5405 WARN_ON_ONCE(iter.err);
5407 nft_map_catchall_activate(ctx, set);
5410 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5412 if (nft_set_is_anonymous(set)) {
5413 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5414 nft_map_activate(ctx, set);
5416 nft_clear(ctx->net, set);
5419 nft_use_inc_restore(&set->use);
5421 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5423 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5424 struct nft_set_binding *binding,
5425 enum nft_trans_phase phase)
5428 case NFT_TRANS_PREPARE_ERROR:
5429 nft_set_trans_unbind(ctx, set);
5430 if (nft_set_is_anonymous(set))
5431 nft_deactivate_next(ctx->net, set);
5433 list_del_rcu(&binding->list);
5435 nft_use_dec(&set->use);
5437 case NFT_TRANS_PREPARE:
5438 if (nft_set_is_anonymous(set)) {
5439 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5440 nft_map_deactivate(ctx, set);
5442 nft_deactivate_next(ctx->net, set);
5444 nft_use_dec(&set->use);
5446 case NFT_TRANS_ABORT:
5447 case NFT_TRANS_RELEASE:
5448 if (nft_set_is_anonymous(set) &&
5449 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5450 nft_map_deactivate(ctx, set);
5452 nft_use_dec(&set->use);
5455 nf_tables_unbind_set(ctx, set, binding,
5456 phase == NFT_TRANS_COMMIT);
5459 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5461 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5463 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5464 nft_set_destroy(ctx, set);
5466 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5468 const struct nft_set_ext_type nft_set_ext_types[] = {
5469 [NFT_SET_EXT_KEY] = {
5470 .align = __alignof__(u32),
5472 [NFT_SET_EXT_DATA] = {
5473 .align = __alignof__(u32),
5475 [NFT_SET_EXT_EXPRESSIONS] = {
5476 .align = __alignof__(struct nft_set_elem_expr),
5478 [NFT_SET_EXT_OBJREF] = {
5479 .len = sizeof(struct nft_object *),
5480 .align = __alignof__(struct nft_object *),
5482 [NFT_SET_EXT_FLAGS] = {
5484 .align = __alignof__(u8),
5486 [NFT_SET_EXT_TIMEOUT] = {
5488 .align = __alignof__(u64),
5490 [NFT_SET_EXT_EXPIRATION] = {
5492 .align = __alignof__(u64),
5494 [NFT_SET_EXT_USERDATA] = {
5495 .len = sizeof(struct nft_userdata),
5496 .align = __alignof__(struct nft_userdata),
5498 [NFT_SET_EXT_KEY_END] = {
5499 .align = __alignof__(u32),
5507 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5508 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5509 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5510 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5511 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5512 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5513 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5514 .len = NFT_USERDATA_MAXLEN },
5515 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5516 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5517 .len = NFT_OBJ_MAXNAMELEN - 1 },
5518 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5519 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5522 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5523 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5524 .len = NFT_TABLE_MAXNAMELEN - 1 },
5525 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5526 .len = NFT_SET_MAXNAMELEN - 1 },
5527 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5528 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5531 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5532 const struct nft_set *set,
5533 const struct nft_set_ext *ext,
5536 struct nft_set_elem_expr *elem_expr;
5537 u32 size, num_exprs = 0;
5538 struct nft_expr *expr;
5539 struct nlattr *nest;
5541 elem_expr = nft_set_ext_expr(ext);
5542 nft_setelem_expr_foreach(expr, elem_expr, size)
5545 if (num_exprs == 1) {
5546 expr = nft_setelem_expr_at(elem_expr, 0);
5547 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr, reset) < 0)
5551 } else if (num_exprs > 1) {
5552 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5554 goto nla_put_failure;
5556 nft_setelem_expr_foreach(expr, elem_expr, size) {
5557 expr = nft_setelem_expr_at(elem_expr, size);
5558 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr, reset) < 0)
5559 goto nla_put_failure;
5561 nla_nest_end(skb, nest);
5569 static int nf_tables_fill_setelem(struct sk_buff *skb,
5570 const struct nft_set *set,
5571 const struct nft_set_elem *elem,
5574 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5575 unsigned char *b = skb_tail_pointer(skb);
5576 struct nlattr *nest;
5578 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5580 goto nla_put_failure;
5582 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5583 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5584 NFT_DATA_VALUE, set->klen) < 0)
5585 goto nla_put_failure;
5587 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5588 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5589 NFT_DATA_VALUE, set->klen) < 0)
5590 goto nla_put_failure;
5592 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5593 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5594 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5596 goto nla_put_failure;
5598 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5599 nft_set_elem_expr_dump(skb, set, ext, reset))
5600 goto nla_put_failure;
5602 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5603 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5604 (*nft_set_ext_obj(ext))->key.name) < 0)
5605 goto nla_put_failure;
5607 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5608 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5609 htonl(*nft_set_ext_flags(ext))))
5610 goto nla_put_failure;
5612 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5613 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5614 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5616 goto nla_put_failure;
5618 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5619 u64 expires, now = get_jiffies_64();
5621 expires = *nft_set_ext_expiration(ext);
5622 if (time_before64(now, expires))
5627 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5628 nf_jiffies64_to_msecs(expires),
5630 goto nla_put_failure;
5633 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5634 struct nft_userdata *udata;
5636 udata = nft_set_ext_userdata(ext);
5637 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5638 udata->len + 1, udata->data))
5639 goto nla_put_failure;
5642 nla_nest_end(skb, nest);
5650 struct nft_set_dump_args {
5651 const struct netlink_callback *cb;
5652 struct nft_set_iter iter;
5653 struct sk_buff *skb;
5657 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5658 struct nft_set *set,
5659 const struct nft_set_iter *iter,
5660 struct nft_set_elem *elem)
5662 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5663 struct nft_set_dump_args *args;
5665 if (nft_set_elem_expired(ext))
5668 args = container_of(iter, struct nft_set_dump_args, iter);
5669 return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
5672 static void audit_log_nft_set_reset(const struct nft_table *table,
5673 unsigned int base_seq,
5674 unsigned int nentries)
5676 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
5678 audit_log_nfcfg(buf, table->family, nentries,
5679 AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
5683 struct nft_set_dump_ctx {
5684 const struct nft_set *set;
5688 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5689 const struct nft_set *set, bool reset,
5690 unsigned int base_seq)
5692 struct nft_set_elem_catchall *catchall;
5693 u8 genmask = nft_genmask_cur(net);
5694 struct nft_set_elem elem;
5695 struct nft_set_ext *ext;
5698 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5699 ext = nft_set_elem_ext(set, catchall->elem);
5700 if (!nft_set_elem_active(ext, genmask) ||
5701 nft_set_elem_expired(ext))
5704 elem.priv = catchall->elem;
5705 ret = nf_tables_fill_setelem(skb, set, &elem, reset);
5707 audit_log_nft_set_reset(set->table, base_seq, 1);
5714 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5716 struct nft_set_dump_ctx *dump_ctx = cb->data;
5717 struct net *net = sock_net(skb->sk);
5718 struct nftables_pernet *nft_net;
5719 struct nft_table *table;
5720 struct nft_set *set;
5721 struct nft_set_dump_args args;
5722 bool set_found = false;
5723 struct nlmsghdr *nlh;
5724 struct nlattr *nest;
5730 nft_net = nft_pernet(net);
5731 cb->seq = READ_ONCE(nft_net->base_seq);
5733 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5734 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5735 dump_ctx->ctx.family != table->family)
5738 if (table != dump_ctx->ctx.table)
5741 list_for_each_entry_rcu(set, &table->sets, list) {
5742 if (set == dump_ctx->set) {
5755 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5756 portid = NETLINK_CB(cb->skb).portid;
5757 seq = cb->nlh->nlmsg_seq;
5759 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5760 table->family, NFNETLINK_V0, nft_base_seq(net));
5762 goto nla_put_failure;
5764 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5765 goto nla_put_failure;
5766 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5767 goto nla_put_failure;
5769 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5771 goto nla_put_failure;
5773 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
5779 args.iter.genmask = nft_genmask_cur(net);
5780 args.iter.skip = cb->args[0];
5781 args.iter.count = 0;
5783 args.iter.fn = nf_tables_dump_setelem;
5784 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5786 if (!args.iter.err && args.iter.count == cb->args[0])
5787 args.iter.err = nft_set_catchall_dump(net, skb, set,
5789 nla_nest_end(skb, nest);
5790 nlmsg_end(skb, nlh);
5792 if (reset && args.iter.count > args.iter.skip)
5793 audit_log_nft_set_reset(table, cb->seq,
5794 args.iter.count - args.iter.skip);
5798 if (args.iter.err && args.iter.err != -EMSGSIZE)
5799 return args.iter.err;
5800 if (args.iter.count == cb->args[0])
5803 cb->args[0] = args.iter.count;
5811 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5813 struct nft_set_dump_ctx *dump_ctx = cb->data;
5815 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5817 return cb->data ? 0 : -ENOMEM;
5820 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5826 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5827 const struct nft_ctx *ctx, u32 seq,
5828 u32 portid, int event, u16 flags,
5829 const struct nft_set *set,
5830 const struct nft_set_elem *elem,
5833 struct nlmsghdr *nlh;
5834 struct nlattr *nest;
5837 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5838 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5839 NFNETLINK_V0, nft_base_seq(ctx->net));
5841 goto nla_put_failure;
5843 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5844 goto nla_put_failure;
5845 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5846 goto nla_put_failure;
5848 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5850 goto nla_put_failure;
5852 err = nf_tables_fill_setelem(skb, set, elem, reset);
5854 goto nla_put_failure;
5856 nla_nest_end(skb, nest);
5858 nlmsg_end(skb, nlh);
5862 nlmsg_trim(skb, nlh);
5866 static int nft_setelem_parse_flags(const struct nft_set *set,
5867 const struct nlattr *attr, u32 *flags)
5872 *flags = ntohl(nla_get_be32(attr));
5873 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5875 if (!(set->flags & NFT_SET_INTERVAL) &&
5876 *flags & NFT_SET_ELEM_INTERVAL_END)
5878 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5879 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5885 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5886 struct nft_data *key, struct nlattr *attr)
5888 struct nft_data_desc desc = {
5889 .type = NFT_DATA_VALUE,
5890 .size = NFT_DATA_VALUE_MAXLEN,
5894 return nft_data_init(ctx, key, &desc, attr);
5897 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5898 struct nft_data_desc *desc,
5899 struct nft_data *data,
5900 struct nlattr *attr)
5904 if (set->dtype == NFT_DATA_VERDICT)
5905 dtype = NFT_DATA_VERDICT;
5907 dtype = NFT_DATA_VALUE;
5910 desc->size = NFT_DATA_VALUE_MAXLEN;
5911 desc->len = set->dlen;
5912 desc->flags = NFT_DATA_DESC_SETELEM;
5914 return nft_data_init(ctx, data, desc, attr);
5917 static void *nft_setelem_catchall_get(const struct net *net,
5918 const struct nft_set *set)
5920 struct nft_set_elem_catchall *catchall;
5921 u8 genmask = nft_genmask_cur(net);
5922 struct nft_set_ext *ext;
5925 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5926 ext = nft_set_elem_ext(set, catchall->elem);
5927 if (!nft_set_elem_active(ext, genmask) ||
5928 nft_set_elem_expired(ext))
5931 priv = catchall->elem;
5938 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5939 struct nft_set_elem *elem, u32 flags)
5943 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5944 priv = set->ops->get(ctx->net, set, elem, flags);
5946 return PTR_ERR(priv);
5948 priv = nft_setelem_catchall_get(ctx->net, set);
5957 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5958 const struct nlattr *attr, bool reset)
5960 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5961 struct nft_set_elem elem;
5962 struct sk_buff *skb;
5966 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5967 nft_set_elem_policy, NULL);
5971 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5975 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5978 if (nla[NFTA_SET_ELEM_KEY]) {
5979 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5980 nla[NFTA_SET_ELEM_KEY]);
5985 if (nla[NFTA_SET_ELEM_KEY_END]) {
5986 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5987 nla[NFTA_SET_ELEM_KEY_END]);
5992 err = nft_setelem_get(ctx, set, &elem, flags);
5997 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
6001 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
6002 NFT_MSG_NEWSETELEM, 0, set, &elem,
6005 goto err_fill_setelem;
6007 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
6014 /* called with rcu_read_lock held */
6015 static int nf_tables_getsetelem(struct sk_buff *skb,
6016 const struct nfnl_info *info,
6017 const struct nlattr * const nla[])
6019 struct netlink_ext_ack *extack = info->extack;
6020 u8 genmask = nft_genmask_cur(info->net);
6021 u8 family = info->nfmsg->nfgen_family;
6022 int rem, err = 0, nelems = 0;
6023 struct net *net = info->net;
6024 struct nft_table *table;
6025 struct nft_set *set;
6026 struct nlattr *attr;
6030 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6032 if (IS_ERR(table)) {
6033 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6034 return PTR_ERR(table);
6037 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6039 return PTR_ERR(set);
6041 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6043 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6044 struct netlink_dump_control c = {
6045 .start = nf_tables_dump_set_start,
6046 .dump = nf_tables_dump_set,
6047 .done = nf_tables_dump_set_done,
6048 .module = THIS_MODULE,
6050 struct nft_set_dump_ctx dump_ctx = {
6056 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6059 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6062 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETSETELEM_RESET)
6065 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6066 err = nft_get_set_elem(&ctx, set, attr, reset);
6068 NL_SET_BAD_ATTR(extack, attr);
6075 audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
6081 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
6082 const struct nft_set *set,
6083 const struct nft_set_elem *elem,
6086 struct nftables_pernet *nft_net;
6087 struct net *net = ctx->net;
6088 u32 portid = ctx->portid;
6089 struct sk_buff *skb;
6093 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
6096 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
6100 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
6101 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
6103 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
6110 nft_net = nft_pernet(net);
6111 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
6114 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
6117 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
6119 struct nft_set *set)
6121 struct nft_trans *trans;
6123 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
6127 nft_trans_elem_set(trans) = set;
6131 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
6132 const struct nft_set *set,
6133 const struct nlattr *attr)
6135 struct nft_expr *expr;
6138 expr = nft_expr_init(ctx, attr);
6143 if (expr->ops->type->flags & NFT_EXPR_GC) {
6144 if (set->flags & NFT_SET_TIMEOUT)
6145 goto err_set_elem_expr;
6146 if (!set->ops->gc_init)
6147 goto err_set_elem_expr;
6148 set->ops->gc_init(set);
6154 nft_expr_destroy(ctx, expr);
6155 return ERR_PTR(err);
6158 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
6160 len += nft_set_ext_types[id].len;
6161 if (len > tmpl->ext_len[id] ||
6168 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
6169 void *to, const void *from, u32 len)
6171 if (nft_set_ext_check(tmpl, id, len) < 0)
6174 memcpy(to, from, len);
6179 void *nft_set_elem_init(const struct nft_set *set,
6180 const struct nft_set_ext_tmpl *tmpl,
6181 const u32 *key, const u32 *key_end,
6182 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
6184 struct nft_set_ext *ext;
6187 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
6189 return ERR_PTR(-ENOMEM);
6191 ext = nft_set_elem_ext(set, elem);
6192 nft_set_ext_init(ext, tmpl);
6194 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
6195 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
6196 nft_set_ext_key(ext), key, set->klen) < 0)
6199 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
6200 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
6201 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
6204 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6205 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
6206 nft_set_ext_data(ext), data, set->dlen) < 0)
6209 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
6210 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
6211 if (expiration == 0)
6212 *nft_set_ext_expiration(ext) += timeout;
6214 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
6215 *nft_set_ext_timeout(ext) = timeout;
6222 return ERR_PTR(-EINVAL);
6225 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6226 struct nft_expr *expr)
6228 if (expr->ops->destroy_clone) {
6229 expr->ops->destroy_clone(ctx, expr);
6230 module_put(expr->ops->type->owner);
6232 nf_tables_expr_destroy(ctx, expr);
6236 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
6237 struct nft_set_elem_expr *elem_expr)
6239 struct nft_expr *expr;
6242 nft_setelem_expr_foreach(expr, elem_expr, size)
6243 __nft_set_elem_expr_destroy(ctx, expr);
6246 /* Drop references and destroy. Called from gc, dynset and abort path. */
6247 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
6250 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6251 struct nft_ctx ctx = {
6252 .net = read_pnet(&set->net),
6253 .family = set->table->family,
6256 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
6257 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6258 nft_data_release(nft_set_ext_data(ext), set->dtype);
6259 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6260 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
6262 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6263 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
6266 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
6268 /* Destroy element. References have been already dropped in the preparation
6269 * path via nft_setelem_data_deactivate().
6271 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
6272 const struct nft_set *set, void *elem)
6274 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
6276 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
6277 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
6282 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
6283 struct nft_expr *expr_array[])
6285 struct nft_expr *expr;
6288 for (i = 0; i < set->num_exprs; i++) {
6289 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
6293 err = nft_expr_clone(expr, set->exprs[i]);
6298 expr_array[i] = expr;
6304 for (k = i - 1; k >= 0; k--)
6305 nft_expr_destroy(ctx, expr_array[k]);
6310 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
6311 const struct nft_set_ext_tmpl *tmpl,
6312 const struct nft_set_ext *ext,
6313 struct nft_expr *expr_array[],
6316 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
6317 u32 len = sizeof(struct nft_set_elem_expr);
6318 struct nft_expr *expr;
6324 for (i = 0; i < num_exprs; i++)
6325 len += expr_array[i]->ops->size;
6327 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
6330 for (i = 0; i < num_exprs; i++) {
6331 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
6332 err = nft_expr_clone(expr, expr_array[i]);
6334 goto err_elem_expr_setup;
6336 elem_expr->size += expr_array[i]->ops->size;
6337 nft_expr_destroy(ctx, expr_array[i]);
6338 expr_array[i] = NULL;
6343 err_elem_expr_setup:
6344 for (; i < num_exprs; i++) {
6345 nft_expr_destroy(ctx, expr_array[i]);
6346 expr_array[i] = NULL;
6352 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
6353 const struct nft_set *set)
6355 struct nft_set_elem_catchall *catchall;
6356 u8 genmask = nft_genmask_cur(net);
6357 struct nft_set_ext *ext;
6359 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6360 ext = nft_set_elem_ext(set, catchall->elem);
6361 if (nft_set_elem_active(ext, genmask) &&
6362 !nft_set_elem_expired(ext) &&
6363 !nft_set_elem_is_dead(ext))
6369 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6371 static int nft_setelem_catchall_insert(const struct net *net,
6372 struct nft_set *set,
6373 const struct nft_set_elem *elem,
6374 struct nft_set_ext **pext)
6376 struct nft_set_elem_catchall *catchall;
6377 u8 genmask = nft_genmask_next(net);
6378 struct nft_set_ext *ext;
6380 list_for_each_entry(catchall, &set->catchall_list, list) {
6381 ext = nft_set_elem_ext(set, catchall->elem);
6382 if (nft_set_elem_active(ext, genmask)) {
6388 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6392 catchall->elem = elem->priv;
6393 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6398 static int nft_setelem_insert(const struct net *net,
6399 struct nft_set *set,
6400 const struct nft_set_elem *elem,
6401 struct nft_set_ext **ext, unsigned int flags)
6405 if (flags & NFT_SET_ELEM_CATCHALL)
6406 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6408 ret = set->ops->insert(net, set, elem, ext);
6413 static bool nft_setelem_is_catchall(const struct nft_set *set,
6414 const struct nft_set_elem *elem)
6416 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6418 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6419 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6425 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6426 struct nft_set_elem *elem)
6428 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6430 if (nft_setelem_is_catchall(set, elem)) {
6431 nft_set_elem_change_active(net, set, ext);
6433 set->ops->activate(net, set, elem);
6437 static int nft_setelem_catchall_deactivate(const struct net *net,
6438 struct nft_set *set,
6439 struct nft_set_elem *elem)
6441 struct nft_set_elem_catchall *catchall;
6442 struct nft_set_ext *ext;
6444 list_for_each_entry(catchall, &set->catchall_list, list) {
6445 ext = nft_set_elem_ext(set, catchall->elem);
6446 if (!nft_is_active_next(net, ext))
6450 elem->priv = catchall->elem;
6451 nft_set_elem_change_active(net, set, ext);
6458 static int __nft_setelem_deactivate(const struct net *net,
6459 struct nft_set *set,
6460 struct nft_set_elem *elem)
6464 priv = set->ops->deactivate(net, set, elem);
6475 static int nft_setelem_deactivate(const struct net *net,
6476 struct nft_set *set,
6477 struct nft_set_elem *elem, u32 flags)
6481 if (flags & NFT_SET_ELEM_CATCHALL)
6482 ret = nft_setelem_catchall_deactivate(net, set, elem);
6484 ret = __nft_setelem_deactivate(net, set, elem);
6489 static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall)
6491 list_del_rcu(&catchall->list);
6492 kfree_rcu(catchall, rcu);
6495 static void nft_setelem_catchall_remove(const struct net *net,
6496 const struct nft_set *set,
6497 const struct nft_set_elem *elem)
6499 struct nft_set_elem_catchall *catchall, *next;
6501 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6502 if (catchall->elem == elem->priv) {
6503 nft_setelem_catchall_destroy(catchall);
6509 static void nft_setelem_remove(const struct net *net,
6510 const struct nft_set *set,
6511 const struct nft_set_elem *elem)
6513 if (nft_setelem_is_catchall(set, elem))
6514 nft_setelem_catchall_remove(net, set, elem);
6516 set->ops->remove(net, set, elem);
6519 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6520 struct nlattr **nla, u32 flags)
6522 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6523 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6524 if (flags & NFT_SET_ELEM_INTERVAL_END)
6527 if (nla[NFTA_SET_ELEM_KEY_END] &&
6528 flags & NFT_SET_ELEM_CATCHALL)
6531 if (nla[NFTA_SET_ELEM_KEY_END])
6538 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6539 const struct nlattr *attr, u32 nlmsg_flags)
6541 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6542 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6543 u8 genmask = nft_genmask_next(ctx->net);
6544 u32 flags = 0, size = 0, num_exprs = 0;
6545 struct nft_set_ext_tmpl tmpl;
6546 struct nft_set_ext *ext, *ext2;
6547 struct nft_set_elem elem;
6548 struct nft_set_binding *binding;
6549 struct nft_object *obj = NULL;
6550 struct nft_userdata *udata;
6551 struct nft_data_desc desc;
6552 enum nft_registers dreg;
6553 struct nft_trans *trans;
6559 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6560 nft_set_elem_policy, NULL);
6564 nft_set_ext_prepare(&tmpl);
6566 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6570 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6571 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6575 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6580 if (set->flags & NFT_SET_MAP) {
6581 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6582 !(flags & NFT_SET_ELEM_INTERVAL_END))
6585 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6589 if (set->flags & NFT_SET_OBJECT) {
6590 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6591 !(flags & NFT_SET_ELEM_INTERVAL_END))
6594 if (nla[NFTA_SET_ELEM_OBJREF])
6598 if (!nft_setelem_valid_key_end(set, nla, flags))
6601 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6602 (nla[NFTA_SET_ELEM_DATA] ||
6603 nla[NFTA_SET_ELEM_OBJREF] ||
6604 nla[NFTA_SET_ELEM_TIMEOUT] ||
6605 nla[NFTA_SET_ELEM_EXPIRATION] ||
6606 nla[NFTA_SET_ELEM_USERDATA] ||
6607 nla[NFTA_SET_ELEM_EXPR] ||
6608 nla[NFTA_SET_ELEM_KEY_END] ||
6609 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6613 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6614 if (!(set->flags & NFT_SET_TIMEOUT))
6616 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6620 } else if (set->flags & NFT_SET_TIMEOUT &&
6621 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6622 timeout = READ_ONCE(set->timeout);
6626 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6627 if (!(set->flags & NFT_SET_TIMEOUT))
6629 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6635 if (nla[NFTA_SET_ELEM_EXPR]) {
6636 struct nft_expr *expr;
6638 if (set->num_exprs && set->num_exprs != 1)
6641 expr = nft_set_elem_expr_alloc(ctx, set,
6642 nla[NFTA_SET_ELEM_EXPR]);
6644 return PTR_ERR(expr);
6646 expr_array[0] = expr;
6649 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6651 goto err_set_elem_expr;
6653 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6654 struct nft_expr *expr;
6659 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6660 if (i == NFT_SET_EXPR_MAX ||
6661 (set->num_exprs && set->num_exprs == i)) {
6663 goto err_set_elem_expr;
6665 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6667 goto err_set_elem_expr;
6669 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6671 err = PTR_ERR(expr);
6672 goto err_set_elem_expr;
6674 expr_array[i] = expr;
6677 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6679 goto err_set_elem_expr;
6683 if (set->num_exprs && set->num_exprs != i) {
6685 goto err_set_elem_expr;
6687 } else if (set->num_exprs > 0 &&
6688 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6689 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6691 goto err_set_elem_expr_clone;
6693 num_exprs = set->num_exprs;
6696 if (nla[NFTA_SET_ELEM_KEY]) {
6697 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6698 nla[NFTA_SET_ELEM_KEY]);
6700 goto err_set_elem_expr;
6702 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6707 if (nla[NFTA_SET_ELEM_KEY_END]) {
6708 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6709 nla[NFTA_SET_ELEM_KEY_END]);
6713 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6715 goto err_parse_key_end;
6719 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6721 goto err_parse_key_end;
6723 if (timeout != READ_ONCE(set->timeout)) {
6724 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6726 goto err_parse_key_end;
6731 for (i = 0; i < num_exprs; i++)
6732 size += expr_array[i]->ops->size;
6734 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6735 sizeof(struct nft_set_elem_expr) + size);
6737 goto err_parse_key_end;
6740 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6741 obj = nft_obj_lookup(ctx->net, ctx->table,
6742 nla[NFTA_SET_ELEM_OBJREF],
6743 set->objtype, genmask);
6747 goto err_parse_key_end;
6750 if (!nft_use_inc(&obj->use)) {
6753 goto err_parse_key_end;
6756 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6758 goto err_parse_key_end;
6761 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6762 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6763 nla[NFTA_SET_ELEM_DATA]);
6765 goto err_parse_key_end;
6767 dreg = nft_type_to_reg(set->dtype);
6768 list_for_each_entry(binding, &set->bindings, list) {
6769 struct nft_ctx bind_ctx = {
6771 .family = ctx->family,
6772 .table = ctx->table,
6773 .chain = (struct nft_chain *)binding->chain,
6776 if (!(binding->flags & NFT_SET_MAP))
6779 err = nft_validate_register_store(&bind_ctx, dreg,
6781 desc.type, desc.len);
6783 goto err_parse_data;
6785 if (desc.type == NFT_DATA_VERDICT &&
6786 (elem.data.val.verdict.code == NFT_GOTO ||
6787 elem.data.val.verdict.code == NFT_JUMP))
6788 nft_validate_state_update(ctx->table,
6792 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6794 goto err_parse_data;
6797 /* The full maximum length of userdata can exceed the maximum
6798 * offset value (U8_MAX) for following extensions, therefor it
6799 * must be the last extension added.
6802 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6803 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6805 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6808 goto err_parse_data;
6812 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6813 elem.key_end.val.data, elem.data.val.data,
6814 timeout, expiration, GFP_KERNEL_ACCOUNT);
6815 if (IS_ERR(elem.priv)) {
6816 err = PTR_ERR(elem.priv);
6817 goto err_parse_data;
6820 ext = nft_set_elem_ext(set, elem.priv);
6822 *nft_set_ext_flags(ext) = flags;
6825 *nft_set_ext_obj(ext) = obj;
6828 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6832 udata = nft_set_ext_userdata(ext);
6833 udata->len = ulen - 1;
6834 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6836 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6840 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6841 if (trans == NULL) {
6846 ext->genmask = nft_genmask_cur(ctx->net);
6848 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6850 if (err == -EEXIST) {
6851 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6852 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6853 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6854 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6855 goto err_element_clash;
6856 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6857 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6858 memcmp(nft_set_ext_data(ext),
6859 nft_set_ext_data(ext2), set->dlen) != 0) ||
6860 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6861 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6862 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6863 goto err_element_clash;
6864 else if (!(nlmsg_flags & NLM_F_EXCL))
6866 } else if (err == -ENOTEMPTY) {
6867 /* ENOTEMPTY reports overlapping between this element
6868 * and an existing one.
6872 goto err_element_clash;
6875 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
6876 unsigned int max = set->size ? set->size + set->ndeact : UINT_MAX;
6878 if (!atomic_add_unless(&set->nelems, 1, max)) {
6884 nft_trans_elem(trans) = elem;
6885 nft_trans_commit_list_add_tail(ctx->net, trans);
6889 nft_setelem_remove(ctx->net, set, &elem);
6893 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6895 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6896 nft_data_release(&elem.data.val, desc.type);
6899 nft_use_dec_restore(&obj->use);
6901 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6903 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6905 for (i = 0; i < num_exprs && expr_array[i]; i++)
6906 nft_expr_destroy(ctx, expr_array[i]);
6907 err_set_elem_expr_clone:
6911 static int nf_tables_newsetelem(struct sk_buff *skb,
6912 const struct nfnl_info *info,
6913 const struct nlattr * const nla[])
6915 struct netlink_ext_ack *extack = info->extack;
6916 u8 genmask = nft_genmask_next(info->net);
6917 u8 family = info->nfmsg->nfgen_family;
6918 struct net *net = info->net;
6919 const struct nlattr *attr;
6920 struct nft_table *table;
6921 struct nft_set *set;
6925 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6928 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6929 genmask, NETLINK_CB(skb).portid);
6930 if (IS_ERR(table)) {
6931 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6932 return PTR_ERR(table);
6935 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6936 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6938 return PTR_ERR(set);
6940 if (!list_empty(&set->bindings) &&
6941 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6944 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6946 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6947 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6949 NL_SET_BAD_ATTR(extack, attr);
6954 if (table->validate_state == NFT_VALIDATE_DO)
6955 return nft_table_validate(net, table);
6961 * nft_data_hold - hold a nft_data item
6963 * @data: struct nft_data to release
6964 * @type: type of data
6966 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6967 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6968 * NFT_GOTO verdicts. This function must be called on active data objects
6969 * from the second phase of the commit protocol.
6971 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6973 struct nft_chain *chain;
6975 if (type == NFT_DATA_VERDICT) {
6976 switch (data->verdict.code) {
6979 chain = data->verdict.chain;
6980 nft_use_inc_restore(&chain->use);
6986 static void nft_setelem_data_activate(const struct net *net,
6987 const struct nft_set *set,
6988 struct nft_set_elem *elem)
6990 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6992 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6993 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6994 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6995 nft_use_inc_restore(&(*nft_set_ext_obj(ext))->use);
6998 void nft_setelem_data_deactivate(const struct net *net,
6999 const struct nft_set *set,
7000 struct nft_set_elem *elem)
7002 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
7004 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
7005 nft_data_release(nft_set_ext_data(ext), set->dtype);
7006 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
7007 nft_use_dec(&(*nft_set_ext_obj(ext))->use);
7010 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
7011 const struct nlattr *attr)
7013 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
7014 struct nft_set_ext_tmpl tmpl;
7015 struct nft_set_elem elem;
7016 struct nft_set_ext *ext;
7017 struct nft_trans *trans;
7021 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
7022 nft_set_elem_policy, NULL);
7026 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
7030 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
7033 if (!nft_setelem_valid_key_end(set, nla, flags))
7036 nft_set_ext_prepare(&tmpl);
7039 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
7044 if (nla[NFTA_SET_ELEM_KEY]) {
7045 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
7046 nla[NFTA_SET_ELEM_KEY]);
7050 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
7055 if (nla[NFTA_SET_ELEM_KEY_END]) {
7056 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
7057 nla[NFTA_SET_ELEM_KEY_END]);
7061 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
7063 goto fail_elem_key_end;
7067 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
7068 elem.key_end.val.data, NULL, 0, 0,
7069 GFP_KERNEL_ACCOUNT);
7070 if (IS_ERR(elem.priv)) {
7071 err = PTR_ERR(elem.priv);
7072 goto fail_elem_key_end;
7075 ext = nft_set_elem_ext(set, elem.priv);
7077 *nft_set_ext_flags(ext) = flags;
7079 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
7083 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
7087 nft_setelem_data_deactivate(ctx->net, set, &elem);
7089 nft_trans_elem(trans) = elem;
7090 nft_trans_commit_list_add_tail(ctx->net, trans);
7098 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
7100 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
7104 static int nft_setelem_flush(const struct nft_ctx *ctx,
7105 struct nft_set *set,
7106 const struct nft_set_iter *iter,
7107 struct nft_set_elem *elem)
7109 struct nft_trans *trans;
7112 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7113 sizeof(struct nft_trans_elem), GFP_ATOMIC);
7117 if (!set->ops->flush(ctx->net, set, elem->priv)) {
7123 nft_setelem_data_deactivate(ctx->net, set, elem);
7124 nft_trans_elem_set(trans) = set;
7125 nft_trans_elem(trans) = *elem;
7126 nft_trans_commit_list_add_tail(ctx->net, trans);
7134 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
7135 struct nft_set *set,
7136 struct nft_set_elem *elem)
7138 struct nft_trans *trans;
7140 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
7141 sizeof(struct nft_trans_elem), GFP_KERNEL);
7145 nft_setelem_data_deactivate(ctx->net, set, elem);
7146 nft_trans_elem_set(trans) = set;
7147 nft_trans_elem(trans) = *elem;
7148 nft_trans_commit_list_add_tail(ctx->net, trans);
7153 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
7154 struct nft_set *set)
7156 u8 genmask = nft_genmask_next(ctx->net);
7157 struct nft_set_elem_catchall *catchall;
7158 struct nft_set_elem elem;
7159 struct nft_set_ext *ext;
7162 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
7163 ext = nft_set_elem_ext(set, catchall->elem);
7164 if (!nft_set_elem_active(ext, genmask))
7167 elem.priv = catchall->elem;
7168 ret = __nft_set_catchall_flush(ctx, set, &elem);
7171 nft_set_elem_change_active(ctx->net, set, ext);
7177 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
7179 struct nft_set_iter iter = {
7181 .fn = nft_setelem_flush,
7184 set->ops->walk(ctx, set, &iter);
7186 iter.err = nft_set_catchall_flush(ctx, set);
7191 static int nf_tables_delsetelem(struct sk_buff *skb,
7192 const struct nfnl_info *info,
7193 const struct nlattr * const nla[])
7195 struct netlink_ext_ack *extack = info->extack;
7196 u8 genmask = nft_genmask_next(info->net);
7197 u8 family = info->nfmsg->nfgen_family;
7198 struct net *net = info->net;
7199 const struct nlattr *attr;
7200 struct nft_table *table;
7201 struct nft_set *set;
7205 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
7206 genmask, NETLINK_CB(skb).portid);
7207 if (IS_ERR(table)) {
7208 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
7209 return PTR_ERR(table);
7212 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
7214 return PTR_ERR(set);
7216 if (nft_set_is_anonymous(set))
7219 if (!list_empty(&set->bindings) && (set->flags & NFT_SET_CONSTANT))
7222 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7224 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
7225 return nft_set_flush(&ctx, set, genmask);
7227 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
7228 err = nft_del_setelem(&ctx, set, attr);
7229 if (err == -ENOENT &&
7230 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYSETELEM)
7234 NL_SET_BAD_ATTR(extack, attr);
7247 * nft_register_obj- register nf_tables stateful object type
7248 * @obj_type: object type
7250 * Registers the object type for use with nf_tables. Returns zero on
7251 * success or a negative errno code otherwise.
7253 int nft_register_obj(struct nft_object_type *obj_type)
7255 if (obj_type->type == NFT_OBJECT_UNSPEC)
7258 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7259 list_add_rcu(&obj_type->list, &nf_tables_objects);
7260 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7263 EXPORT_SYMBOL_GPL(nft_register_obj);
7266 * nft_unregister_obj - unregister nf_tables object type
7267 * @obj_type: object type
7269 * Unregisters the object type for use with nf_tables.
7271 void nft_unregister_obj(struct nft_object_type *obj_type)
7273 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7274 list_del_rcu(&obj_type->list);
7275 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7277 EXPORT_SYMBOL_GPL(nft_unregister_obj);
7279 struct nft_object *nft_obj_lookup(const struct net *net,
7280 const struct nft_table *table,
7281 const struct nlattr *nla, u32 objtype,
7284 struct nft_object_hash_key k = { .table = table };
7285 char search[NFT_OBJ_MAXNAMELEN];
7286 struct rhlist_head *tmp, *list;
7287 struct nft_object *obj;
7289 nla_strscpy(search, nla, sizeof(search));
7292 WARN_ON_ONCE(!rcu_read_lock_held() &&
7293 !lockdep_commit_lock_is_held(net));
7296 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
7300 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
7301 if (objtype == obj->ops->type->type &&
7302 nft_active_genmask(obj, genmask)) {
7309 return ERR_PTR(-ENOENT);
7311 EXPORT_SYMBOL_GPL(nft_obj_lookup);
7313 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
7314 const struct nlattr *nla,
7315 u32 objtype, u8 genmask)
7317 struct nft_object *obj;
7319 list_for_each_entry(obj, &table->objects, list) {
7320 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
7321 objtype == obj->ops->type->type &&
7322 nft_active_genmask(obj, genmask))
7325 return ERR_PTR(-ENOENT);
7328 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
7329 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
7330 .len = NFT_TABLE_MAXNAMELEN - 1 },
7331 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7332 .len = NFT_OBJ_MAXNAMELEN - 1 },
7333 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7334 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7335 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7336 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7337 .len = NFT_USERDATA_MAXLEN },
7340 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7341 const struct nft_object_type *type,
7342 const struct nlattr *attr)
7345 const struct nft_object_ops *ops;
7346 struct nft_object *obj;
7349 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7354 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7355 type->policy, NULL);
7359 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7362 if (type->select_ops) {
7363 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7373 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7377 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7390 return ERR_PTR(err);
7393 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7394 struct nft_object *obj, bool reset)
7396 struct nlattr *nest;
7398 nest = nla_nest_start_noflag(skb, attr);
7400 goto nla_put_failure;
7401 if (obj->ops->dump(skb, obj, reset) < 0)
7402 goto nla_put_failure;
7403 nla_nest_end(skb, nest);
7410 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7412 const struct nft_object_type *type;
7414 list_for_each_entry(type, &nf_tables_objects, list) {
7415 if (objtype == type->type)
7421 static const struct nft_object_type *
7422 nft_obj_type_get(struct net *net, u32 objtype)
7424 const struct nft_object_type *type;
7426 type = __nft_obj_type_get(objtype);
7427 if (type != NULL && try_module_get(type->owner))
7430 lockdep_nfnl_nft_mutex_not_held();
7431 #ifdef CONFIG_MODULES
7433 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7434 return ERR_PTR(-EAGAIN);
7437 return ERR_PTR(-ENOENT);
7440 static int nf_tables_updobj(const struct nft_ctx *ctx,
7441 const struct nft_object_type *type,
7442 const struct nlattr *attr,
7443 struct nft_object *obj)
7445 struct nft_object *newobj;
7446 struct nft_trans *trans;
7449 if (!try_module_get(type->owner))
7452 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7453 sizeof(struct nft_trans_obj));
7457 newobj = nft_obj_init(ctx, type, attr);
7458 if (IS_ERR(newobj)) {
7459 err = PTR_ERR(newobj);
7460 goto err_free_trans;
7463 nft_trans_obj(trans) = obj;
7464 nft_trans_obj_update(trans) = true;
7465 nft_trans_obj_newobj(trans) = newobj;
7466 nft_trans_commit_list_add_tail(ctx->net, trans);
7473 module_put(type->owner);
7477 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7478 const struct nlattr * const nla[])
7480 struct netlink_ext_ack *extack = info->extack;
7481 u8 genmask = nft_genmask_next(info->net);
7482 u8 family = info->nfmsg->nfgen_family;
7483 const struct nft_object_type *type;
7484 struct net *net = info->net;
7485 struct nft_table *table;
7486 struct nft_object *obj;
7491 if (!nla[NFTA_OBJ_TYPE] ||
7492 !nla[NFTA_OBJ_NAME] ||
7493 !nla[NFTA_OBJ_DATA])
7496 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7497 NETLINK_CB(skb).portid);
7498 if (IS_ERR(table)) {
7499 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7500 return PTR_ERR(table);
7503 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7504 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7507 if (err != -ENOENT) {
7508 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7512 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7513 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7516 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7519 type = __nft_obj_type_get(objtype);
7520 if (WARN_ON_ONCE(!type))
7523 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7525 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7528 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7530 if (!nft_use_inc(&table->use))
7533 type = nft_obj_type_get(net, objtype);
7535 err = PTR_ERR(type);
7539 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7544 obj->key.table = table;
7545 obj->handle = nf_tables_alloc_handle(table);
7547 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7548 if (!obj->key.name) {
7553 if (nla[NFTA_OBJ_USERDATA]) {
7554 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7555 if (obj->udata == NULL)
7558 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7561 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7565 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7566 nft_objname_ht_params);
7570 list_add_tail_rcu(&obj->list, &table->objects);
7574 /* queued in transaction log */
7575 INIT_LIST_HEAD(&obj->list);
7580 kfree(obj->key.name);
7582 if (obj->ops->destroy)
7583 obj->ops->destroy(&ctx, obj);
7586 module_put(type->owner);
7588 nft_use_dec_restore(&table->use);
7593 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7594 u32 portid, u32 seq, int event, u32 flags,
7595 int family, const struct nft_table *table,
7596 struct nft_object *obj, bool reset)
7598 struct nlmsghdr *nlh;
7600 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7601 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7602 NFNETLINK_V0, nft_base_seq(net));
7604 goto nla_put_failure;
7606 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7607 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7608 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7610 goto nla_put_failure;
7612 if (event == NFT_MSG_DELOBJ) {
7613 nlmsg_end(skb, nlh);
7617 if (nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7618 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7619 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset))
7620 goto nla_put_failure;
7623 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7624 goto nla_put_failure;
7626 nlmsg_end(skb, nlh);
7630 nlmsg_trim(skb, nlh);
7634 static void audit_log_obj_reset(const struct nft_table *table,
7635 unsigned int base_seq, unsigned int nentries)
7637 char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
7639 audit_log_nfcfg(buf, table->family, nentries,
7640 AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
7644 struct nft_obj_filter {
7649 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7651 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7652 const struct nft_table *table;
7653 unsigned int idx = 0, s_idx = cb->args[0];
7654 struct nft_obj_filter *filter = cb->data;
7655 struct net *net = sock_net(skb->sk);
7656 int family = nfmsg->nfgen_family;
7657 struct nftables_pernet *nft_net;
7658 unsigned int entries = 0;
7659 struct nft_object *obj;
7663 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7667 nft_net = nft_pernet(net);
7668 cb->seq = READ_ONCE(nft_net->base_seq);
7670 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7671 if (family != NFPROTO_UNSPEC && family != table->family)
7675 list_for_each_entry_rcu(obj, &table->objects, list) {
7676 if (!nft_is_active(net, obj))
7681 memset(&cb->args[1], 0,
7682 sizeof(cb->args) - sizeof(cb->args[0]));
7683 if (filter && filter->table &&
7684 strcmp(filter->table, table->name))
7687 filter->type != NFT_OBJECT_UNSPEC &&
7688 obj->ops->type->type != filter->type)
7691 rc = nf_tables_fill_obj_info(skb, net,
7692 NETLINK_CB(cb->skb).portid,
7695 NLM_F_MULTI | NLM_F_APPEND,
7696 table->family, table,
7702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7706 if (reset && entries)
7707 audit_log_obj_reset(table, nft_net->base_seq, entries);
7717 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7719 const struct nlattr * const *nla = cb->data;
7720 struct nft_obj_filter *filter = NULL;
7722 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7723 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7727 if (nla[NFTA_OBJ_TABLE]) {
7728 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7729 if (!filter->table) {
7735 if (nla[NFTA_OBJ_TYPE])
7736 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7743 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7745 struct nft_obj_filter *filter = cb->data;
7748 kfree(filter->table);
7755 /* called with rcu_read_lock held */
7756 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7757 const struct nlattr * const nla[])
7759 struct netlink_ext_ack *extack = info->extack;
7760 u8 genmask = nft_genmask_cur(info->net);
7761 u8 family = info->nfmsg->nfgen_family;
7762 const struct nft_table *table;
7763 struct net *net = info->net;
7764 struct nft_object *obj;
7765 struct sk_buff *skb2;
7770 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7771 struct netlink_dump_control c = {
7772 .start = nf_tables_dump_obj_start,
7773 .dump = nf_tables_dump_obj,
7774 .done = nf_tables_dump_obj_done,
7775 .module = THIS_MODULE,
7776 .data = (void *)nla,
7779 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7782 if (!nla[NFTA_OBJ_NAME] ||
7783 !nla[NFTA_OBJ_TYPE])
7786 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7787 if (IS_ERR(table)) {
7788 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7789 return PTR_ERR(table);
7792 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7793 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7795 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7796 return PTR_ERR(obj);
7799 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7803 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7807 const struct nftables_pernet *nft_net;
7810 nft_net = nft_pernet(net);
7811 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7813 audit_log_nfcfg(buf,
7816 AUDIT_NFT_OP_OBJ_RESET,
7821 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7822 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7823 family, table, obj, reset);
7825 goto err_fill_obj_info;
7827 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7834 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7836 if (obj->ops->destroy)
7837 obj->ops->destroy(ctx, obj);
7839 module_put(obj->ops->type->owner);
7840 kfree(obj->key.name);
7845 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7846 const struct nlattr * const nla[])
7848 struct netlink_ext_ack *extack = info->extack;
7849 u8 genmask = nft_genmask_next(info->net);
7850 u8 family = info->nfmsg->nfgen_family;
7851 struct net *net = info->net;
7852 const struct nlattr *attr;
7853 struct nft_table *table;
7854 struct nft_object *obj;
7858 if (!nla[NFTA_OBJ_TYPE] ||
7859 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7862 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7863 NETLINK_CB(skb).portid);
7864 if (IS_ERR(table)) {
7865 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7866 return PTR_ERR(table);
7869 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7870 if (nla[NFTA_OBJ_HANDLE]) {
7871 attr = nla[NFTA_OBJ_HANDLE];
7872 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7874 attr = nla[NFTA_OBJ_NAME];
7875 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7879 if (PTR_ERR(obj) == -ENOENT &&
7880 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYOBJ)
7883 NL_SET_BAD_ATTR(extack, attr);
7884 return PTR_ERR(obj);
7887 NL_SET_BAD_ATTR(extack, attr);
7891 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7893 return nft_delobj(&ctx, obj);
7897 __nft_obj_notify(struct net *net, const struct nft_table *table,
7898 struct nft_object *obj, u32 portid, u32 seq, int event,
7899 u16 flags, int family, int report, gfp_t gfp)
7901 struct nftables_pernet *nft_net = nft_pernet(net);
7902 struct sk_buff *skb;
7906 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7909 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7913 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7914 flags & (NLM_F_CREATE | NLM_F_EXCL),
7915 family, table, obj, false);
7921 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7924 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7927 void nft_obj_notify(struct net *net, const struct nft_table *table,
7928 struct nft_object *obj, u32 portid, u32 seq, int event,
7929 u16 flags, int family, int report, gfp_t gfp)
7931 struct nftables_pernet *nft_net = nft_pernet(net);
7932 char *buf = kasprintf(gfp, "%s:%u",
7933 table->name, nft_net->base_seq);
7935 audit_log_nfcfg(buf,
7938 event == NFT_MSG_NEWOBJ ?
7939 AUDIT_NFT_OP_OBJ_REGISTER :
7940 AUDIT_NFT_OP_OBJ_UNREGISTER,
7944 __nft_obj_notify(net, table, obj, portid, seq, event,
7945 flags, family, report, gfp);
7947 EXPORT_SYMBOL_GPL(nft_obj_notify);
7949 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7950 struct nft_object *obj, int event)
7952 __nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
7953 ctx->seq, event, ctx->flags, ctx->family,
7954 ctx->report, GFP_KERNEL);
7960 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7962 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7963 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7964 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7966 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7968 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7970 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7971 list_del_rcu(&type->list);
7972 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7974 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7976 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7977 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7978 .len = NFT_NAME_MAXLEN - 1 },
7979 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7980 .len = NFT_NAME_MAXLEN - 1 },
7981 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7982 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7983 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7986 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7987 const struct nlattr *nla, u8 genmask)
7989 struct nft_flowtable *flowtable;
7991 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7992 if (!nla_strcmp(nla, flowtable->name) &&
7993 nft_active_genmask(flowtable, genmask))
7996 return ERR_PTR(-ENOENT);
7998 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
8000 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
8001 struct nft_flowtable *flowtable,
8002 enum nft_trans_phase phase)
8005 case NFT_TRANS_PREPARE_ERROR:
8006 case NFT_TRANS_PREPARE:
8007 case NFT_TRANS_ABORT:
8008 case NFT_TRANS_RELEASE:
8009 nft_use_dec(&flowtable->use);
8015 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
8017 static struct nft_flowtable *
8018 nft_flowtable_lookup_byhandle(const struct nft_table *table,
8019 const struct nlattr *nla, u8 genmask)
8021 struct nft_flowtable *flowtable;
8023 list_for_each_entry(flowtable, &table->flowtables, list) {
8024 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
8025 nft_active_genmask(flowtable, genmask))
8028 return ERR_PTR(-ENOENT);
8031 struct nft_flowtable_hook {
8034 struct list_head list;
8037 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
8038 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
8039 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
8040 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
8043 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
8044 const struct nlattr * const nla[],
8045 struct nft_flowtable_hook *flowtable_hook,
8046 struct nft_flowtable *flowtable,
8047 struct netlink_ext_ack *extack, bool add)
8049 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
8050 struct nft_hook *hook;
8051 int hooknum, priority;
8054 INIT_LIST_HEAD(&flowtable_hook->list);
8056 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX,
8057 nla[NFTA_FLOWTABLE_HOOK],
8058 nft_flowtable_hook_policy, NULL);
8063 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
8064 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8065 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8069 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8070 if (hooknum != NF_NETDEV_INGRESS)
8073 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8075 flowtable_hook->priority = priority;
8076 flowtable_hook->num = hooknum;
8078 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
8079 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
8080 if (hooknum != flowtable->hooknum)
8084 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
8085 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
8086 if (priority != flowtable->data.priority)
8090 flowtable_hook->priority = flowtable->data.priority;
8091 flowtable_hook->num = flowtable->hooknum;
8094 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
8095 err = nf_tables_parse_netdev_hooks(ctx->net,
8096 tb[NFTA_FLOWTABLE_HOOK_DEVS],
8097 &flowtable_hook->list,
8103 list_for_each_entry(hook, &flowtable_hook->list, list) {
8104 hook->ops.pf = NFPROTO_NETDEV;
8105 hook->ops.hooknum = flowtable_hook->num;
8106 hook->ops.priority = flowtable_hook->priority;
8107 hook->ops.priv = &flowtable->data;
8108 hook->ops.hook = flowtable->data.type->hook;
8114 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
8116 const struct nf_flowtable_type *type;
8118 list_for_each_entry(type, &nf_tables_flowtables, list) {
8119 if (family == type->family)
8125 static const struct nf_flowtable_type *
8126 nft_flowtable_type_get(struct net *net, u8 family)
8128 const struct nf_flowtable_type *type;
8130 type = __nft_flowtable_type_get(family);
8131 if (type != NULL && try_module_get(type->owner))
8134 lockdep_nfnl_nft_mutex_not_held();
8135 #ifdef CONFIG_MODULES
8137 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
8138 return ERR_PTR(-EAGAIN);
8141 return ERR_PTR(-ENOENT);
8144 /* Only called from error and netdev event paths. */
8145 static void nft_unregister_flowtable_hook(struct net *net,
8146 struct nft_flowtable *flowtable,
8147 struct nft_hook *hook)
8149 nf_unregister_net_hook(net, &hook->ops);
8150 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8154 static void __nft_unregister_flowtable_net_hooks(struct net *net,
8155 struct list_head *hook_list,
8156 bool release_netdev)
8158 struct nft_hook *hook, *next;
8160 list_for_each_entry_safe(hook, next, hook_list, list) {
8161 nf_unregister_net_hook(net, &hook->ops);
8162 if (release_netdev) {
8163 list_del(&hook->list);
8164 kfree_rcu(hook, rcu);
8169 static void nft_unregister_flowtable_net_hooks(struct net *net,
8170 struct list_head *hook_list)
8172 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
8175 static int nft_register_flowtable_net_hooks(struct net *net,
8176 struct nft_table *table,
8177 struct list_head *hook_list,
8178 struct nft_flowtable *flowtable)
8180 struct nft_hook *hook, *hook2, *next;
8181 struct nft_flowtable *ft;
8184 list_for_each_entry(hook, hook_list, list) {
8185 list_for_each_entry(ft, &table->flowtables, list) {
8186 if (!nft_is_active_next(net, ft))
8189 list_for_each_entry(hook2, &ft->hook_list, list) {
8190 if (hook->ops.dev == hook2->ops.dev &&
8191 hook->ops.pf == hook2->ops.pf) {
8193 goto err_unregister_net_hooks;
8198 err = flowtable->data.type->setup(&flowtable->data,
8202 goto err_unregister_net_hooks;
8204 err = nf_register_net_hook(net, &hook->ops);
8206 flowtable->data.type->setup(&flowtable->data,
8209 goto err_unregister_net_hooks;
8217 err_unregister_net_hooks:
8218 list_for_each_entry_safe(hook, next, hook_list, list) {
8222 nft_unregister_flowtable_hook(net, flowtable, hook);
8223 list_del_rcu(&hook->list);
8224 kfree_rcu(hook, rcu);
8230 static void nft_hooks_destroy(struct list_head *hook_list)
8232 struct nft_hook *hook, *next;
8234 list_for_each_entry_safe(hook, next, hook_list, list) {
8235 list_del_rcu(&hook->list);
8236 kfree_rcu(hook, rcu);
8240 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
8241 struct nft_flowtable *flowtable,
8242 struct netlink_ext_ack *extack)
8244 const struct nlattr * const *nla = ctx->nla;
8245 struct nft_flowtable_hook flowtable_hook;
8246 struct nft_hook *hook, *next;
8247 struct nft_trans *trans;
8248 bool unregister = false;
8252 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8257 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8258 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
8259 list_del(&hook->list);
8264 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8265 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8266 if (flags & ~NFT_FLOWTABLE_MASK) {
8268 goto err_flowtable_update_hook;
8270 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
8271 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
8273 goto err_flowtable_update_hook;
8276 flags = flowtable->data.flags;
8279 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
8280 &flowtable_hook.list, flowtable);
8282 goto err_flowtable_update_hook;
8284 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
8285 sizeof(struct nft_trans_flowtable));
8289 goto err_flowtable_update_hook;
8292 nft_trans_flowtable_flags(trans) = flags;
8293 nft_trans_flowtable(trans) = flowtable;
8294 nft_trans_flowtable_update(trans) = true;
8295 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8296 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
8298 nft_trans_commit_list_add_tail(ctx->net, trans);
8302 err_flowtable_update_hook:
8303 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
8305 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
8306 list_del_rcu(&hook->list);
8307 kfree_rcu(hook, rcu);
8314 static int nf_tables_newflowtable(struct sk_buff *skb,
8315 const struct nfnl_info *info,
8316 const struct nlattr * const nla[])
8318 struct netlink_ext_ack *extack = info->extack;
8319 struct nft_flowtable_hook flowtable_hook;
8320 u8 genmask = nft_genmask_next(info->net);
8321 u8 family = info->nfmsg->nfgen_family;
8322 const struct nf_flowtable_type *type;
8323 struct nft_flowtable *flowtable;
8324 struct nft_hook *hook, *next;
8325 struct net *net = info->net;
8326 struct nft_table *table;
8330 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8331 !nla[NFTA_FLOWTABLE_NAME] ||
8332 !nla[NFTA_FLOWTABLE_HOOK])
8335 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8336 genmask, NETLINK_CB(skb).portid);
8337 if (IS_ERR(table)) {
8338 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8339 return PTR_ERR(table);
8342 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8344 if (IS_ERR(flowtable)) {
8345 err = PTR_ERR(flowtable);
8346 if (err != -ENOENT) {
8347 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8351 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
8352 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
8356 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8358 return nft_flowtable_update(&ctx, info->nlh, flowtable, extack);
8361 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8363 if (!nft_use_inc(&table->use))
8366 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
8369 goto flowtable_alloc;
8372 flowtable->table = table;
8373 flowtable->handle = nf_tables_alloc_handle(table);
8374 INIT_LIST_HEAD(&flowtable->hook_list);
8376 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
8377 if (!flowtable->name) {
8382 type = nft_flowtable_type_get(net, family);
8384 err = PTR_ERR(type);
8388 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8389 flowtable->data.flags =
8390 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8391 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8397 write_pnet(&flowtable->data.net, net);
8398 flowtable->data.type = type;
8399 err = type->init(&flowtable->data);
8403 err = nft_flowtable_parse_hook(&ctx, nla, &flowtable_hook, flowtable,
8408 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8409 flowtable->data.priority = flowtable_hook.priority;
8410 flowtable->hooknum = flowtable_hook.num;
8412 err = nft_register_flowtable_net_hooks(ctx.net, table,
8413 &flowtable->hook_list,
8416 nft_hooks_destroy(&flowtable->hook_list);
8420 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8424 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8428 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8429 nft_unregister_flowtable_hook(net, flowtable, hook);
8430 list_del_rcu(&hook->list);
8431 kfree_rcu(hook, rcu);
8434 flowtable->data.type->free(&flowtable->data);
8436 module_put(type->owner);
8438 kfree(flowtable->name);
8442 nft_use_dec_restore(&table->use);
8447 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8449 struct nft_hook *this, *next;
8451 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8452 list_del(&this->list);
8457 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8458 struct nft_flowtable *flowtable,
8459 struct netlink_ext_ack *extack)
8461 const struct nlattr * const *nla = ctx->nla;
8462 struct nft_flowtable_hook flowtable_hook;
8463 LIST_HEAD(flowtable_del_list);
8464 struct nft_hook *this, *hook;
8465 struct nft_trans *trans;
8468 err = nft_flowtable_parse_hook(ctx, nla, &flowtable_hook, flowtable,
8473 list_for_each_entry(this, &flowtable_hook.list, list) {
8474 hook = nft_hook_list_find(&flowtable->hook_list, this);
8477 goto err_flowtable_del_hook;
8479 list_move(&hook->list, &flowtable_del_list);
8482 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8483 sizeof(struct nft_trans_flowtable));
8486 goto err_flowtable_del_hook;
8489 nft_trans_flowtable(trans) = flowtable;
8490 nft_trans_flowtable_update(trans) = true;
8491 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8492 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8493 nft_flowtable_hook_release(&flowtable_hook);
8495 nft_trans_commit_list_add_tail(ctx->net, trans);
8499 err_flowtable_del_hook:
8500 list_splice(&flowtable_del_list, &flowtable->hook_list);
8501 nft_flowtable_hook_release(&flowtable_hook);
8506 static int nf_tables_delflowtable(struct sk_buff *skb,
8507 const struct nfnl_info *info,
8508 const struct nlattr * const nla[])
8510 struct netlink_ext_ack *extack = info->extack;
8511 u8 genmask = nft_genmask_next(info->net);
8512 u8 family = info->nfmsg->nfgen_family;
8513 struct nft_flowtable *flowtable;
8514 struct net *net = info->net;
8515 const struct nlattr *attr;
8516 struct nft_table *table;
8519 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8520 (!nla[NFTA_FLOWTABLE_NAME] &&
8521 !nla[NFTA_FLOWTABLE_HANDLE]))
8524 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8525 genmask, NETLINK_CB(skb).portid);
8526 if (IS_ERR(table)) {
8527 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8528 return PTR_ERR(table);
8531 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8532 attr = nla[NFTA_FLOWTABLE_HANDLE];
8533 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8535 attr = nla[NFTA_FLOWTABLE_NAME];
8536 flowtable = nft_flowtable_lookup(table, attr, genmask);
8539 if (IS_ERR(flowtable)) {
8540 if (PTR_ERR(flowtable) == -ENOENT &&
8541 NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYFLOWTABLE)
8544 NL_SET_BAD_ATTR(extack, attr);
8545 return PTR_ERR(flowtable);
8548 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8550 if (nla[NFTA_FLOWTABLE_HOOK])
8551 return nft_delflowtable_hook(&ctx, flowtable, extack);
8553 if (flowtable->use > 0) {
8554 NL_SET_BAD_ATTR(extack, attr);
8558 return nft_delflowtable(&ctx, flowtable);
8561 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8562 u32 portid, u32 seq, int event,
8563 u32 flags, int family,
8564 struct nft_flowtable *flowtable,
8565 struct list_head *hook_list)
8567 struct nlattr *nest, *nest_devs;
8568 struct nft_hook *hook;
8569 struct nlmsghdr *nlh;
8571 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8572 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8573 NFNETLINK_V0, nft_base_seq(net));
8575 goto nla_put_failure;
8577 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8578 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8579 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8580 NFTA_FLOWTABLE_PAD))
8581 goto nla_put_failure;
8583 if (event == NFT_MSG_DELFLOWTABLE && !hook_list) {
8584 nlmsg_end(skb, nlh);
8588 if (nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8589 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8590 goto nla_put_failure;
8592 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8594 goto nla_put_failure;
8595 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8596 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8597 goto nla_put_failure;
8599 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8601 goto nla_put_failure;
8604 hook_list = &flowtable->hook_list;
8606 list_for_each_entry_rcu(hook, hook_list, list) {
8607 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8608 goto nla_put_failure;
8610 nla_nest_end(skb, nest_devs);
8611 nla_nest_end(skb, nest);
8613 nlmsg_end(skb, nlh);
8617 nlmsg_trim(skb, nlh);
8621 struct nft_flowtable_filter {
8625 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8626 struct netlink_callback *cb)
8628 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8629 struct nft_flowtable_filter *filter = cb->data;
8630 unsigned int idx = 0, s_idx = cb->args[0];
8631 struct net *net = sock_net(skb->sk);
8632 int family = nfmsg->nfgen_family;
8633 struct nft_flowtable *flowtable;
8634 struct nftables_pernet *nft_net;
8635 const struct nft_table *table;
8638 nft_net = nft_pernet(net);
8639 cb->seq = READ_ONCE(nft_net->base_seq);
8641 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8642 if (family != NFPROTO_UNSPEC && family != table->family)
8645 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8646 if (!nft_is_active(net, flowtable))
8651 memset(&cb->args[1], 0,
8652 sizeof(cb->args) - sizeof(cb->args[0]));
8653 if (filter && filter->table &&
8654 strcmp(filter->table, table->name))
8657 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8659 NFT_MSG_NEWFLOWTABLE,
8660 NLM_F_MULTI | NLM_F_APPEND,
8662 flowtable, NULL) < 0)
8665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8677 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8679 const struct nlattr * const *nla = cb->data;
8680 struct nft_flowtable_filter *filter = NULL;
8682 if (nla[NFTA_FLOWTABLE_TABLE]) {
8683 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8687 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8689 if (!filter->table) {
8699 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8701 struct nft_flowtable_filter *filter = cb->data;
8706 kfree(filter->table);
8712 /* called with rcu_read_lock held */
8713 static int nf_tables_getflowtable(struct sk_buff *skb,
8714 const struct nfnl_info *info,
8715 const struct nlattr * const nla[])
8717 u8 genmask = nft_genmask_cur(info->net);
8718 u8 family = info->nfmsg->nfgen_family;
8719 struct nft_flowtable *flowtable;
8720 const struct nft_table *table;
8721 struct net *net = info->net;
8722 struct sk_buff *skb2;
8725 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8726 struct netlink_dump_control c = {
8727 .start = nf_tables_dump_flowtable_start,
8728 .dump = nf_tables_dump_flowtable,
8729 .done = nf_tables_dump_flowtable_done,
8730 .module = THIS_MODULE,
8731 .data = (void *)nla,
8734 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8737 if (!nla[NFTA_FLOWTABLE_NAME])
8740 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8743 return PTR_ERR(table);
8745 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8747 if (IS_ERR(flowtable))
8748 return PTR_ERR(flowtable);
8750 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8754 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8755 info->nlh->nlmsg_seq,
8756 NFT_MSG_NEWFLOWTABLE, 0, family,
8759 goto err_fill_flowtable_info;
8761 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8763 err_fill_flowtable_info:
8768 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8769 struct nft_flowtable *flowtable,
8770 struct list_head *hook_list, int event)
8772 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8773 struct sk_buff *skb;
8778 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8781 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8785 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8786 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8788 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8789 ctx->seq, event, flags,
8790 ctx->family, flowtable, hook_list);
8796 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8799 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8802 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8804 struct nft_hook *hook, *next;
8806 flowtable->data.type->free(&flowtable->data);
8807 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8808 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8810 list_del_rcu(&hook->list);
8813 kfree(flowtable->name);
8814 module_put(flowtable->data.type->owner);
8818 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8819 u32 portid, u32 seq)
8821 struct nftables_pernet *nft_net = nft_pernet(net);
8822 struct nlmsghdr *nlh;
8823 char buf[TASK_COMM_LEN];
8824 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8826 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8827 NFNETLINK_V0, nft_base_seq(net));
8829 goto nla_put_failure;
8831 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8832 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8833 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8834 goto nla_put_failure;
8836 nlmsg_end(skb, nlh);
8840 nlmsg_trim(skb, nlh);
8844 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8845 struct nft_flowtable *flowtable)
8847 struct nft_hook *hook;
8849 list_for_each_entry(hook, &flowtable->hook_list, list) {
8850 if (hook->ops.dev != dev)
8853 /* flow_offload_netdev_event() cleans up entries for us. */
8854 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8855 list_del_rcu(&hook->list);
8856 kfree_rcu(hook, rcu);
8861 static int nf_tables_flowtable_event(struct notifier_block *this,
8862 unsigned long event, void *ptr)
8864 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8865 struct nft_flowtable *flowtable;
8866 struct nftables_pernet *nft_net;
8867 struct nft_table *table;
8870 if (event != NETDEV_UNREGISTER)
8874 nft_net = nft_pernet(net);
8875 mutex_lock(&nft_net->commit_mutex);
8876 list_for_each_entry(table, &nft_net->tables, list) {
8877 list_for_each_entry(flowtable, &table->flowtables, list) {
8878 nft_flowtable_event(event, dev, flowtable);
8881 mutex_unlock(&nft_net->commit_mutex);
8886 static struct notifier_block nf_tables_flowtable_notifier = {
8887 .notifier_call = nf_tables_flowtable_event,
8890 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8893 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8894 struct sk_buff *skb2;
8897 if (!nlmsg_report(nlh) &&
8898 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8901 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8905 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8912 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8913 nlmsg_report(nlh), GFP_KERNEL);
8916 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8920 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8921 const struct nlattr * const nla[])
8923 struct sk_buff *skb2;
8926 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8930 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8931 info->nlh->nlmsg_seq);
8933 goto err_fill_gen_info;
8935 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8942 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8943 [NFT_MSG_NEWTABLE] = {
8944 .call = nf_tables_newtable,
8945 .type = NFNL_CB_BATCH,
8946 .attr_count = NFTA_TABLE_MAX,
8947 .policy = nft_table_policy,
8949 [NFT_MSG_GETTABLE] = {
8950 .call = nf_tables_gettable,
8951 .type = NFNL_CB_RCU,
8952 .attr_count = NFTA_TABLE_MAX,
8953 .policy = nft_table_policy,
8955 [NFT_MSG_DELTABLE] = {
8956 .call = nf_tables_deltable,
8957 .type = NFNL_CB_BATCH,
8958 .attr_count = NFTA_TABLE_MAX,
8959 .policy = nft_table_policy,
8961 [NFT_MSG_DESTROYTABLE] = {
8962 .call = nf_tables_deltable,
8963 .type = NFNL_CB_BATCH,
8964 .attr_count = NFTA_TABLE_MAX,
8965 .policy = nft_table_policy,
8967 [NFT_MSG_NEWCHAIN] = {
8968 .call = nf_tables_newchain,
8969 .type = NFNL_CB_BATCH,
8970 .attr_count = NFTA_CHAIN_MAX,
8971 .policy = nft_chain_policy,
8973 [NFT_MSG_GETCHAIN] = {
8974 .call = nf_tables_getchain,
8975 .type = NFNL_CB_RCU,
8976 .attr_count = NFTA_CHAIN_MAX,
8977 .policy = nft_chain_policy,
8979 [NFT_MSG_DELCHAIN] = {
8980 .call = nf_tables_delchain,
8981 .type = NFNL_CB_BATCH,
8982 .attr_count = NFTA_CHAIN_MAX,
8983 .policy = nft_chain_policy,
8985 [NFT_MSG_DESTROYCHAIN] = {
8986 .call = nf_tables_delchain,
8987 .type = NFNL_CB_BATCH,
8988 .attr_count = NFTA_CHAIN_MAX,
8989 .policy = nft_chain_policy,
8991 [NFT_MSG_NEWRULE] = {
8992 .call = nf_tables_newrule,
8993 .type = NFNL_CB_BATCH,
8994 .attr_count = NFTA_RULE_MAX,
8995 .policy = nft_rule_policy,
8997 [NFT_MSG_GETRULE] = {
8998 .call = nf_tables_getrule,
8999 .type = NFNL_CB_RCU,
9000 .attr_count = NFTA_RULE_MAX,
9001 .policy = nft_rule_policy,
9003 [NFT_MSG_GETRULE_RESET] = {
9004 .call = nf_tables_getrule,
9005 .type = NFNL_CB_RCU,
9006 .attr_count = NFTA_RULE_MAX,
9007 .policy = nft_rule_policy,
9009 [NFT_MSG_DELRULE] = {
9010 .call = nf_tables_delrule,
9011 .type = NFNL_CB_BATCH,
9012 .attr_count = NFTA_RULE_MAX,
9013 .policy = nft_rule_policy,
9015 [NFT_MSG_DESTROYRULE] = {
9016 .call = nf_tables_delrule,
9017 .type = NFNL_CB_BATCH,
9018 .attr_count = NFTA_RULE_MAX,
9019 .policy = nft_rule_policy,
9021 [NFT_MSG_NEWSET] = {
9022 .call = nf_tables_newset,
9023 .type = NFNL_CB_BATCH,
9024 .attr_count = NFTA_SET_MAX,
9025 .policy = nft_set_policy,
9027 [NFT_MSG_GETSET] = {
9028 .call = nf_tables_getset,
9029 .type = NFNL_CB_RCU,
9030 .attr_count = NFTA_SET_MAX,
9031 .policy = nft_set_policy,
9033 [NFT_MSG_DELSET] = {
9034 .call = nf_tables_delset,
9035 .type = NFNL_CB_BATCH,
9036 .attr_count = NFTA_SET_MAX,
9037 .policy = nft_set_policy,
9039 [NFT_MSG_DESTROYSET] = {
9040 .call = nf_tables_delset,
9041 .type = NFNL_CB_BATCH,
9042 .attr_count = NFTA_SET_MAX,
9043 .policy = nft_set_policy,
9045 [NFT_MSG_NEWSETELEM] = {
9046 .call = nf_tables_newsetelem,
9047 .type = NFNL_CB_BATCH,
9048 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9049 .policy = nft_set_elem_list_policy,
9051 [NFT_MSG_GETSETELEM] = {
9052 .call = nf_tables_getsetelem,
9053 .type = NFNL_CB_RCU,
9054 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9055 .policy = nft_set_elem_list_policy,
9057 [NFT_MSG_GETSETELEM_RESET] = {
9058 .call = nf_tables_getsetelem,
9059 .type = NFNL_CB_RCU,
9060 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9061 .policy = nft_set_elem_list_policy,
9063 [NFT_MSG_DELSETELEM] = {
9064 .call = nf_tables_delsetelem,
9065 .type = NFNL_CB_BATCH,
9066 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9067 .policy = nft_set_elem_list_policy,
9069 [NFT_MSG_DESTROYSETELEM] = {
9070 .call = nf_tables_delsetelem,
9071 .type = NFNL_CB_BATCH,
9072 .attr_count = NFTA_SET_ELEM_LIST_MAX,
9073 .policy = nft_set_elem_list_policy,
9075 [NFT_MSG_GETGEN] = {
9076 .call = nf_tables_getgen,
9077 .type = NFNL_CB_RCU,
9079 [NFT_MSG_NEWOBJ] = {
9080 .call = nf_tables_newobj,
9081 .type = NFNL_CB_BATCH,
9082 .attr_count = NFTA_OBJ_MAX,
9083 .policy = nft_obj_policy,
9085 [NFT_MSG_GETOBJ] = {
9086 .call = nf_tables_getobj,
9087 .type = NFNL_CB_RCU,
9088 .attr_count = NFTA_OBJ_MAX,
9089 .policy = nft_obj_policy,
9091 [NFT_MSG_DELOBJ] = {
9092 .call = nf_tables_delobj,
9093 .type = NFNL_CB_BATCH,
9094 .attr_count = NFTA_OBJ_MAX,
9095 .policy = nft_obj_policy,
9097 [NFT_MSG_DESTROYOBJ] = {
9098 .call = nf_tables_delobj,
9099 .type = NFNL_CB_BATCH,
9100 .attr_count = NFTA_OBJ_MAX,
9101 .policy = nft_obj_policy,
9103 [NFT_MSG_GETOBJ_RESET] = {
9104 .call = nf_tables_getobj,
9105 .type = NFNL_CB_RCU,
9106 .attr_count = NFTA_OBJ_MAX,
9107 .policy = nft_obj_policy,
9109 [NFT_MSG_NEWFLOWTABLE] = {
9110 .call = nf_tables_newflowtable,
9111 .type = NFNL_CB_BATCH,
9112 .attr_count = NFTA_FLOWTABLE_MAX,
9113 .policy = nft_flowtable_policy,
9115 [NFT_MSG_GETFLOWTABLE] = {
9116 .call = nf_tables_getflowtable,
9117 .type = NFNL_CB_RCU,
9118 .attr_count = NFTA_FLOWTABLE_MAX,
9119 .policy = nft_flowtable_policy,
9121 [NFT_MSG_DELFLOWTABLE] = {
9122 .call = nf_tables_delflowtable,
9123 .type = NFNL_CB_BATCH,
9124 .attr_count = NFTA_FLOWTABLE_MAX,
9125 .policy = nft_flowtable_policy,
9127 [NFT_MSG_DESTROYFLOWTABLE] = {
9128 .call = nf_tables_delflowtable,
9129 .type = NFNL_CB_BATCH,
9130 .attr_count = NFTA_FLOWTABLE_MAX,
9131 .policy = nft_flowtable_policy,
9135 static int nf_tables_validate(struct net *net)
9137 struct nftables_pernet *nft_net = nft_pernet(net);
9138 struct nft_table *table;
9140 list_for_each_entry(table, &nft_net->tables, list) {
9141 switch (table->validate_state) {
9142 case NFT_VALIDATE_SKIP:
9144 case NFT_VALIDATE_NEED:
9145 nft_validate_state_update(table, NFT_VALIDATE_DO);
9147 case NFT_VALIDATE_DO:
9148 if (nft_table_validate(net, table) < 0)
9151 nft_validate_state_update(table, NFT_VALIDATE_SKIP);
9159 /* a drop policy has to be deferred until all rules have been activated,
9160 * otherwise a large ruleset that contains a drop-policy base chain will
9161 * cause all packets to get dropped until the full transaction has been
9164 * We defer the drop policy until the transaction has been finalized.
9166 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
9168 struct nft_base_chain *basechain;
9170 if (nft_trans_chain_policy(trans) != NF_DROP)
9173 if (!nft_is_base_chain(trans->ctx.chain))
9176 basechain = nft_base_chain(trans->ctx.chain);
9177 basechain->policy = NF_DROP;
9180 static void nft_chain_commit_update(struct nft_trans *trans)
9182 struct nft_base_chain *basechain;
9184 if (nft_trans_chain_name(trans)) {
9185 rhltable_remove(&trans->ctx.table->chains_ht,
9186 &trans->ctx.chain->rhlhead,
9187 nft_chain_ht_params);
9188 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
9189 rhltable_insert_key(&trans->ctx.table->chains_ht,
9190 trans->ctx.chain->name,
9191 &trans->ctx.chain->rhlhead,
9192 nft_chain_ht_params);
9195 if (!nft_is_base_chain(trans->ctx.chain))
9198 nft_chain_stats_replace(trans);
9200 basechain = nft_base_chain(trans->ctx.chain);
9202 switch (nft_trans_chain_policy(trans)) {
9205 basechain->policy = nft_trans_chain_policy(trans);
9210 static void nft_obj_commit_update(struct nft_trans *trans)
9212 struct nft_object *newobj;
9213 struct nft_object *obj;
9215 obj = nft_trans_obj(trans);
9216 newobj = nft_trans_obj_newobj(trans);
9218 if (obj->ops->update)
9219 obj->ops->update(obj, newobj);
9221 nft_obj_destroy(&trans->ctx, newobj);
9224 static void nft_commit_release(struct nft_trans *trans)
9226 switch (trans->msg_type) {
9227 case NFT_MSG_DELTABLE:
9228 case NFT_MSG_DESTROYTABLE:
9229 nf_tables_table_destroy(&trans->ctx);
9231 case NFT_MSG_NEWCHAIN:
9232 free_percpu(nft_trans_chain_stats(trans));
9233 kfree(nft_trans_chain_name(trans));
9235 case NFT_MSG_DELCHAIN:
9236 case NFT_MSG_DESTROYCHAIN:
9237 if (nft_trans_chain_update(trans))
9238 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
9240 nf_tables_chain_destroy(&trans->ctx);
9242 case NFT_MSG_DELRULE:
9243 case NFT_MSG_DESTROYRULE:
9244 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9246 case NFT_MSG_DELSET:
9247 case NFT_MSG_DESTROYSET:
9248 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9250 case NFT_MSG_DELSETELEM:
9251 case NFT_MSG_DESTROYSETELEM:
9252 nf_tables_set_elem_destroy(&trans->ctx,
9253 nft_trans_elem_set(trans),
9254 nft_trans_elem(trans).priv);
9256 case NFT_MSG_DELOBJ:
9257 case NFT_MSG_DESTROYOBJ:
9258 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9260 case NFT_MSG_DELFLOWTABLE:
9261 case NFT_MSG_DESTROYFLOWTABLE:
9262 if (nft_trans_flowtable_update(trans))
9263 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9265 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9270 put_net(trans->ctx.net);
9275 static void nf_tables_trans_destroy_work(struct work_struct *w)
9277 struct nft_trans *trans, *next;
9280 spin_lock(&nf_tables_destroy_list_lock);
9281 list_splice_init(&nf_tables_destroy_list, &head);
9282 spin_unlock(&nf_tables_destroy_list_lock);
9284 if (list_empty(&head))
9289 list_for_each_entry_safe(trans, next, &head, list) {
9290 nft_trans_list_del(trans);
9291 nft_commit_release(trans);
9295 void nf_tables_trans_destroy_flush_work(void)
9297 flush_work(&trans_destroy_work);
9299 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
9301 static bool nft_expr_reduce(struct nft_regs_track *track,
9302 const struct nft_expr *expr)
9307 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
9309 const struct nft_expr *expr, *last;
9310 struct nft_regs_track track = {};
9311 unsigned int size, data_size;
9312 void *data, *data_boundary;
9313 struct nft_rule_dp *prule;
9314 struct nft_rule *rule;
9316 /* already handled or inactive chain? */
9317 if (chain->blob_next || !nft_is_active_next(net, chain))
9321 list_for_each_entry(rule, &chain->rules, list) {
9322 if (nft_is_active_next(net, rule)) {
9323 data_size += sizeof(*prule) + rule->dlen;
9324 if (data_size > INT_MAX)
9329 chain->blob_next = nf_tables_chain_alloc_rules(chain, data_size);
9330 if (!chain->blob_next)
9333 data = (void *)chain->blob_next->data;
9334 data_boundary = data + data_size;
9337 list_for_each_entry(rule, &chain->rules, list) {
9338 if (!nft_is_active_next(net, rule))
9341 prule = (struct nft_rule_dp *)data;
9342 data += offsetof(struct nft_rule_dp, data);
9343 if (WARN_ON_ONCE(data > data_boundary))
9347 track.last = nft_expr_last(rule);
9348 nft_rule_for_each_expr(expr, last, rule) {
9351 if (nft_expr_reduce(&track, expr)) {
9356 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
9359 memcpy(data + size, expr, expr->ops->size);
9360 size += expr->ops->size;
9362 if (WARN_ON_ONCE(size >= 1 << 12))
9365 prule->handle = rule->handle;
9371 chain->blob_next->size += (unsigned long)(data - (void *)prule);
9374 if (WARN_ON_ONCE(data > data_boundary))
9377 prule = (struct nft_rule_dp *)data;
9378 nft_last_rule(chain, prule);
9383 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
9385 struct nftables_pernet *nft_net = nft_pernet(net);
9386 struct nft_trans *trans, *next;
9388 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9389 struct nft_chain *chain = trans->ctx.chain;
9391 if (trans->msg_type == NFT_MSG_NEWRULE ||
9392 trans->msg_type == NFT_MSG_DELRULE) {
9393 kvfree(chain->blob_next);
9394 chain->blob_next = NULL;
9399 static void __nf_tables_commit_chain_free_rules(struct rcu_head *h)
9401 struct nft_rule_dp_last *l = container_of(h, struct nft_rule_dp_last, h);
9406 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
9408 struct nft_rule_dp_last *last;
9410 /* last rule trailer is after end marker */
9411 last = (void *)blob + sizeof(*blob) + blob->size;
9414 call_rcu(&last->h, __nf_tables_commit_chain_free_rules);
9417 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
9419 struct nft_rule_blob *g0, *g1;
9422 next_genbit = nft_gencursor_next(net);
9424 g0 = rcu_dereference_protected(chain->blob_gen_0,
9425 lockdep_commit_lock_is_held(net));
9426 g1 = rcu_dereference_protected(chain->blob_gen_1,
9427 lockdep_commit_lock_is_held(net));
9429 /* No changes to this chain? */
9430 if (chain->blob_next == NULL) {
9431 /* chain had no change in last or next generation */
9435 * chain had no change in this generation; make sure next
9436 * one uses same rules as current generation.
9439 rcu_assign_pointer(chain->blob_gen_1, g0);
9440 nf_tables_commit_chain_free_rules_old(g1);
9442 rcu_assign_pointer(chain->blob_gen_0, g1);
9443 nf_tables_commit_chain_free_rules_old(g0);
9450 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
9452 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
9454 chain->blob_next = NULL;
9460 nf_tables_commit_chain_free_rules_old(g1);
9462 nf_tables_commit_chain_free_rules_old(g0);
9465 static void nft_obj_del(struct nft_object *obj)
9467 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9468 list_del_rcu(&obj->list);
9471 void nft_chain_del(struct nft_chain *chain)
9473 struct nft_table *table = chain->table;
9475 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9476 nft_chain_ht_params));
9477 list_del_rcu(&chain->list);
9480 static void nft_trans_gc_setelem_remove(struct nft_ctx *ctx,
9481 struct nft_trans_gc *trans)
9483 void **priv = trans->priv;
9486 for (i = 0; i < trans->count; i++) {
9487 struct nft_set_elem elem = {
9491 nft_setelem_data_deactivate(ctx->net, trans->set, &elem);
9492 nft_setelem_remove(ctx->net, trans->set, &elem);
9496 void nft_trans_gc_destroy(struct nft_trans_gc *trans)
9498 nft_set_put(trans->set);
9499 put_net(trans->net);
9503 static void nft_trans_gc_trans_free(struct rcu_head *rcu)
9505 struct nft_set_elem elem = {};
9506 struct nft_trans_gc *trans;
9507 struct nft_ctx ctx = {};
9510 trans = container_of(rcu, struct nft_trans_gc, rcu);
9511 ctx.net = read_pnet(&trans->set->net);
9513 for (i = 0; i < trans->count; i++) {
9514 elem.priv = trans->priv[i];
9515 if (!nft_setelem_is_catchall(trans->set, &elem))
9516 atomic_dec(&trans->set->nelems);
9518 nf_tables_set_elem_destroy(&ctx, trans->set, elem.priv);
9521 nft_trans_gc_destroy(trans);
9524 static bool nft_trans_gc_work_done(struct nft_trans_gc *trans)
9526 struct nftables_pernet *nft_net;
9527 struct nft_ctx ctx = {};
9529 nft_net = nft_pernet(trans->net);
9531 mutex_lock(&nft_net->commit_mutex);
9533 /* Check for race with transaction, otherwise this batch refers to
9534 * stale objects that might not be there anymore. Skip transaction if
9535 * set has been destroyed from control plane transaction in case gc
9536 * worker loses race.
9538 if (READ_ONCE(nft_net->gc_seq) != trans->seq || trans->set->dead) {
9539 mutex_unlock(&nft_net->commit_mutex);
9543 ctx.net = trans->net;
9544 ctx.table = trans->set->table;
9546 nft_trans_gc_setelem_remove(&ctx, trans);
9547 mutex_unlock(&nft_net->commit_mutex);
9552 static void nft_trans_gc_work(struct work_struct *work)
9554 struct nft_trans_gc *trans, *next;
9555 LIST_HEAD(trans_gc_list);
9557 spin_lock(&nf_tables_gc_list_lock);
9558 list_splice_init(&nf_tables_gc_list, &trans_gc_list);
9559 spin_unlock(&nf_tables_gc_list_lock);
9561 list_for_each_entry_safe(trans, next, &trans_gc_list, list) {
9562 list_del(&trans->list);
9563 if (!nft_trans_gc_work_done(trans)) {
9564 nft_trans_gc_destroy(trans);
9567 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9571 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
9572 unsigned int gc_seq, gfp_t gfp)
9574 struct net *net = read_pnet(&set->net);
9575 struct nft_trans_gc *trans;
9577 trans = kzalloc(sizeof(*trans), gfp);
9581 trans->net = maybe_get_net(net);
9587 refcount_inc(&set->refs);
9589 trans->seq = gc_seq;
9594 void nft_trans_gc_elem_add(struct nft_trans_gc *trans, void *priv)
9596 trans->priv[trans->count++] = priv;
9599 static void nft_trans_gc_queue_work(struct nft_trans_gc *trans)
9601 spin_lock(&nf_tables_gc_list_lock);
9602 list_add_tail(&trans->list, &nf_tables_gc_list);
9603 spin_unlock(&nf_tables_gc_list_lock);
9605 schedule_work(&trans_gc_work);
9608 static int nft_trans_gc_space(struct nft_trans_gc *trans)
9610 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
9613 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
9614 unsigned int gc_seq, gfp_t gfp)
9616 struct nft_set *set;
9618 if (nft_trans_gc_space(gc))
9622 nft_trans_gc_queue_work(gc);
9624 return nft_trans_gc_alloc(set, gc_seq, gfp);
9627 void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
9629 if (trans->count == 0) {
9630 nft_trans_gc_destroy(trans);
9634 nft_trans_gc_queue_work(trans);
9637 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
9639 struct nft_set *set;
9641 if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
9644 if (nft_trans_gc_space(gc))
9648 call_rcu(&gc->rcu, nft_trans_gc_trans_free);
9650 return nft_trans_gc_alloc(set, 0, gfp);
9653 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
9655 WARN_ON_ONCE(!lockdep_commit_lock_is_held(trans->net));
9657 if (trans->count == 0) {
9658 nft_trans_gc_destroy(trans);
9662 call_rcu(&trans->rcu, nft_trans_gc_trans_free);
9665 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
9666 unsigned int gc_seq)
9668 struct nft_set_elem_catchall *catchall;
9669 const struct nft_set *set = gc->set;
9670 struct nft_set_ext *ext;
9672 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9673 ext = nft_set_elem_ext(set, catchall->elem);
9675 if (!nft_set_elem_expired(ext))
9677 if (nft_set_elem_is_dead(ext))
9680 nft_set_elem_dead(ext);
9682 gc = nft_trans_gc_queue_async(gc, gc_seq, GFP_ATOMIC);
9686 nft_trans_gc_elem_add(gc, catchall->elem);
9692 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc)
9694 struct nft_set_elem_catchall *catchall, *next;
9695 const struct nft_set *set = gc->set;
9696 struct nft_set_elem elem;
9697 struct nft_set_ext *ext;
9699 WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net));
9701 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
9702 ext = nft_set_elem_ext(set, catchall->elem);
9704 if (!nft_set_elem_expired(ext))
9707 gc = nft_trans_gc_queue_sync(gc, GFP_KERNEL);
9711 memset(&elem, 0, sizeof(elem));
9712 elem.priv = catchall->elem;
9714 nft_setelem_data_deactivate(gc->net, gc->set, &elem);
9715 nft_setelem_catchall_destroy(catchall);
9716 nft_trans_gc_elem_add(gc, elem.priv);
9722 static void nf_tables_module_autoload_cleanup(struct net *net)
9724 struct nftables_pernet *nft_net = nft_pernet(net);
9725 struct nft_module_request *req, *next;
9727 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9728 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9729 WARN_ON_ONCE(!req->done);
9730 list_del(&req->list);
9735 static void nf_tables_commit_release(struct net *net)
9737 struct nftables_pernet *nft_net = nft_pernet(net);
9738 struct nft_trans *trans;
9740 /* all side effects have to be made visible.
9741 * For example, if a chain named 'foo' has been deleted, a
9742 * new transaction must not find it anymore.
9744 * Memory reclaim happens asynchronously from work queue
9745 * to prevent expensive synchronize_rcu() in commit phase.
9747 if (list_empty(&nft_net->commit_list)) {
9748 nf_tables_module_autoload_cleanup(net);
9749 mutex_unlock(&nft_net->commit_mutex);
9753 trans = list_last_entry(&nft_net->commit_list,
9754 struct nft_trans, list);
9755 get_net(trans->ctx.net);
9756 WARN_ON_ONCE(trans->put_net);
9758 trans->put_net = true;
9759 spin_lock(&nf_tables_destroy_list_lock);
9760 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9761 spin_unlock(&nf_tables_destroy_list_lock);
9763 nf_tables_module_autoload_cleanup(net);
9764 schedule_work(&trans_destroy_work);
9766 mutex_unlock(&nft_net->commit_mutex);
9769 static void nft_commit_notify(struct net *net, u32 portid)
9771 struct nftables_pernet *nft_net = nft_pernet(net);
9772 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9773 unsigned char *data;
9776 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9780 len = NLMSG_GOODSIZE - skb->len;
9781 list_del(&skb->list);
9785 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9786 data = skb_put(batch_skb, skb->len);
9787 memcpy(data, skb->data, skb->len);
9788 list_del(&skb->list);
9792 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9793 NFT_CB(batch_skb).report, GFP_KERNEL);
9798 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9799 NFT_CB(batch_skb).report, GFP_KERNEL);
9802 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9805 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9806 struct nft_table *table)
9808 struct nft_audit_data *adp;
9810 list_for_each_entry(adp, adl, list) {
9811 if (adp->table == table)
9814 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9818 list_add(&adp->list, adl);
9822 static void nf_tables_commit_audit_free(struct list_head *adl)
9824 struct nft_audit_data *adp, *adn;
9826 list_for_each_entry_safe(adp, adn, adl, list) {
9827 list_del(&adp->list);
9832 static void nf_tables_commit_audit_collect(struct list_head *adl,
9833 struct nft_table *table, u32 op)
9835 struct nft_audit_data *adp;
9837 list_for_each_entry(adp, adl, list) {
9838 if (adp->table == table)
9841 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9845 if (!adp->op || adp->op > op)
9849 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9851 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9853 struct nft_audit_data *adp, *adn;
9854 char aubuf[AUNFTABLENAMELEN];
9856 list_for_each_entry_safe(adp, adn, adl, list) {
9857 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9859 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9860 nft2audit_op[adp->op], GFP_KERNEL);
9861 list_del(&adp->list);
9866 static void nft_set_commit_update(struct list_head *set_update_list)
9868 struct nft_set *set, *next;
9870 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9871 list_del_init(&set->pending_update);
9873 if (!set->ops->commit || set->dead)
9876 set->ops->commit(set);
9880 static unsigned int nft_gc_seq_begin(struct nftables_pernet *nft_net)
9882 unsigned int gc_seq;
9884 /* Bump gc counter, it becomes odd, this is the busy mark. */
9885 gc_seq = READ_ONCE(nft_net->gc_seq);
9886 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9891 static void nft_gc_seq_end(struct nftables_pernet *nft_net, unsigned int gc_seq)
9893 WRITE_ONCE(nft_net->gc_seq, ++gc_seq);
9896 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9898 struct nftables_pernet *nft_net = nft_pernet(net);
9899 struct nft_trans *trans, *next;
9900 unsigned int base_seq, gc_seq;
9901 LIST_HEAD(set_update_list);
9902 struct nft_trans_elem *te;
9903 struct nft_chain *chain;
9904 struct nft_table *table;
9908 if (list_empty(&nft_net->commit_list)) {
9909 mutex_unlock(&nft_net->commit_mutex);
9913 list_for_each_entry(trans, &nft_net->binding_list, binding_list) {
9914 switch (trans->msg_type) {
9915 case NFT_MSG_NEWSET:
9916 if (!nft_trans_set_update(trans) &&
9917 nft_set_is_anonymous(nft_trans_set(trans)) &&
9918 !nft_trans_set_bound(trans)) {
9919 pr_warn_once("nftables ruleset with unbound set\n");
9923 case NFT_MSG_NEWCHAIN:
9924 if (!nft_trans_chain_update(trans) &&
9925 nft_chain_binding(nft_trans_chain(trans)) &&
9926 !nft_trans_chain_bound(trans)) {
9927 pr_warn_once("nftables ruleset with unbound chain\n");
9934 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9935 if (nf_tables_validate(net) < 0) {
9936 nft_net->validate_state = NFT_VALIDATE_DO;
9940 err = nft_flow_rule_offload_commit(net);
9944 /* 1. Allocate space for next generation rules_gen_X[] */
9945 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9948 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9950 nf_tables_commit_chain_prepare_cancel(net);
9951 nf_tables_commit_audit_free(&adl);
9954 if (trans->msg_type == NFT_MSG_NEWRULE ||
9955 trans->msg_type == NFT_MSG_DELRULE) {
9956 chain = trans->ctx.chain;
9958 ret = nf_tables_commit_chain_prepare(net, chain);
9960 nf_tables_commit_chain_prepare_cancel(net);
9961 nf_tables_commit_audit_free(&adl);
9967 /* step 2. Make rules_gen_X visible to packet path */
9968 list_for_each_entry(table, &nft_net->tables, list) {
9969 list_for_each_entry(chain, &table->chains, list)
9970 nf_tables_commit_chain(net, chain);
9974 * Bump generation counter, invalidate any dump in progress.
9975 * Cannot fail after this point.
9977 base_seq = READ_ONCE(nft_net->base_seq);
9978 while (++base_seq == 0)
9981 WRITE_ONCE(nft_net->base_seq, base_seq);
9983 gc_seq = nft_gc_seq_begin(nft_net);
9985 /* step 3. Start new generation, rules_gen_X now in use. */
9986 net->nft.gencursor = nft_gencursor_next(net);
9988 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9989 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9991 switch (trans->msg_type) {
9992 case NFT_MSG_NEWTABLE:
9993 if (nft_trans_table_update(trans)) {
9994 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9995 nft_trans_destroy(trans);
9998 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9999 nf_tables_table_disable(net, trans->ctx.table);
10001 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10003 nft_clear(net, trans->ctx.table);
10005 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
10006 nft_trans_destroy(trans);
10008 case NFT_MSG_DELTABLE:
10009 case NFT_MSG_DESTROYTABLE:
10010 list_del_rcu(&trans->ctx.table->list);
10011 nf_tables_table_notify(&trans->ctx, trans->msg_type);
10013 case NFT_MSG_NEWCHAIN:
10014 if (nft_trans_chain_update(trans)) {
10015 nft_chain_commit_update(trans);
10016 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
10017 &nft_trans_chain_hooks(trans));
10018 list_splice(&nft_trans_chain_hooks(trans),
10019 &nft_trans_basechain(trans)->hook_list);
10020 /* trans destroyed after rcu grace period */
10022 nft_chain_commit_drop_policy(trans);
10023 nft_clear(net, trans->ctx.chain);
10024 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
10025 nft_trans_destroy(trans);
10028 case NFT_MSG_DELCHAIN:
10029 case NFT_MSG_DESTROYCHAIN:
10030 if (nft_trans_chain_update(trans)) {
10031 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10032 &nft_trans_chain_hooks(trans));
10033 nft_netdev_unregister_hooks(net,
10034 &nft_trans_chain_hooks(trans),
10037 nft_chain_del(trans->ctx.chain);
10038 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
10040 nf_tables_unregister_hook(trans->ctx.net,
10045 case NFT_MSG_NEWRULE:
10046 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10047 nf_tables_rule_notify(&trans->ctx,
10048 nft_trans_rule(trans),
10050 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10051 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10053 nft_trans_destroy(trans);
10055 case NFT_MSG_DELRULE:
10056 case NFT_MSG_DESTROYRULE:
10057 list_del_rcu(&nft_trans_rule(trans)->list);
10058 nf_tables_rule_notify(&trans->ctx,
10059 nft_trans_rule(trans),
10061 nft_rule_expr_deactivate(&trans->ctx,
10062 nft_trans_rule(trans),
10065 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10066 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10068 case NFT_MSG_NEWSET:
10069 if (nft_trans_set_update(trans)) {
10070 struct nft_set *set = nft_trans_set(trans);
10072 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
10073 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
10075 if (nft_trans_set_size(trans))
10076 WRITE_ONCE(set->size, nft_trans_set_size(trans));
10078 nft_clear(net, nft_trans_set(trans));
10079 /* This avoids hitting -EBUSY when deleting the table
10080 * from the transaction.
10082 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
10083 !list_empty(&nft_trans_set(trans)->bindings))
10084 nft_use_dec(&trans->ctx.table->use);
10086 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10087 NFT_MSG_NEWSET, GFP_KERNEL);
10088 nft_trans_destroy(trans);
10090 case NFT_MSG_DELSET:
10091 case NFT_MSG_DESTROYSET:
10092 nft_trans_set(trans)->dead = 1;
10093 list_del_rcu(&nft_trans_set(trans)->list);
10094 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
10095 trans->msg_type, GFP_KERNEL);
10097 case NFT_MSG_NEWSETELEM:
10098 te = (struct nft_trans_elem *)trans->data;
10100 nft_setelem_activate(net, te->set, &te->elem);
10101 nf_tables_setelem_notify(&trans->ctx, te->set,
10103 NFT_MSG_NEWSETELEM);
10104 if (te->set->ops->commit &&
10105 list_empty(&te->set->pending_update)) {
10106 list_add_tail(&te->set->pending_update,
10109 nft_trans_destroy(trans);
10111 case NFT_MSG_DELSETELEM:
10112 case NFT_MSG_DESTROYSETELEM:
10113 te = (struct nft_trans_elem *)trans->data;
10115 nf_tables_setelem_notify(&trans->ctx, te->set,
10118 nft_setelem_remove(net, te->set, &te->elem);
10119 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
10120 atomic_dec(&te->set->nelems);
10123 if (te->set->ops->commit &&
10124 list_empty(&te->set->pending_update)) {
10125 list_add_tail(&te->set->pending_update,
10129 case NFT_MSG_NEWOBJ:
10130 if (nft_trans_obj_update(trans)) {
10131 nft_obj_commit_update(trans);
10132 nf_tables_obj_notify(&trans->ctx,
10133 nft_trans_obj(trans),
10136 nft_clear(net, nft_trans_obj(trans));
10137 nf_tables_obj_notify(&trans->ctx,
10138 nft_trans_obj(trans),
10140 nft_trans_destroy(trans);
10143 case NFT_MSG_DELOBJ:
10144 case NFT_MSG_DESTROYOBJ:
10145 nft_obj_del(nft_trans_obj(trans));
10146 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
10149 case NFT_MSG_NEWFLOWTABLE:
10150 if (nft_trans_flowtable_update(trans)) {
10151 nft_trans_flowtable(trans)->data.flags =
10152 nft_trans_flowtable_flags(trans);
10153 nf_tables_flowtable_notify(&trans->ctx,
10154 nft_trans_flowtable(trans),
10155 &nft_trans_flowtable_hooks(trans),
10156 NFT_MSG_NEWFLOWTABLE);
10157 list_splice(&nft_trans_flowtable_hooks(trans),
10158 &nft_trans_flowtable(trans)->hook_list);
10160 nft_clear(net, nft_trans_flowtable(trans));
10161 nf_tables_flowtable_notify(&trans->ctx,
10162 nft_trans_flowtable(trans),
10164 NFT_MSG_NEWFLOWTABLE);
10166 nft_trans_destroy(trans);
10168 case NFT_MSG_DELFLOWTABLE:
10169 case NFT_MSG_DESTROYFLOWTABLE:
10170 if (nft_trans_flowtable_update(trans)) {
10171 nf_tables_flowtable_notify(&trans->ctx,
10172 nft_trans_flowtable(trans),
10173 &nft_trans_flowtable_hooks(trans),
10175 nft_unregister_flowtable_net_hooks(net,
10176 &nft_trans_flowtable_hooks(trans));
10178 list_del_rcu(&nft_trans_flowtable(trans)->list);
10179 nf_tables_flowtable_notify(&trans->ctx,
10180 nft_trans_flowtable(trans),
10183 nft_unregister_flowtable_net_hooks(net,
10184 &nft_trans_flowtable(trans)->hook_list);
10190 nft_set_commit_update(&set_update_list);
10192 nft_commit_notify(net, NETLINK_CB(skb).portid);
10193 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
10194 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
10196 nft_gc_seq_end(nft_net, gc_seq);
10197 nft_net->validate_state = NFT_VALIDATE_SKIP;
10198 nf_tables_commit_release(net);
10203 static void nf_tables_module_autoload(struct net *net)
10205 struct nftables_pernet *nft_net = nft_pernet(net);
10206 struct nft_module_request *req, *next;
10207 LIST_HEAD(module_list);
10209 list_splice_init(&nft_net->module_list, &module_list);
10210 mutex_unlock(&nft_net->commit_mutex);
10211 list_for_each_entry_safe(req, next, &module_list, list) {
10212 request_module("%s", req->module);
10215 mutex_lock(&nft_net->commit_mutex);
10216 list_splice(&module_list, &nft_net->module_list);
10219 static void nf_tables_abort_release(struct nft_trans *trans)
10221 switch (trans->msg_type) {
10222 case NFT_MSG_NEWTABLE:
10223 nf_tables_table_destroy(&trans->ctx);
10225 case NFT_MSG_NEWCHAIN:
10226 if (nft_trans_chain_update(trans))
10227 nft_hooks_destroy(&nft_trans_chain_hooks(trans));
10229 nf_tables_chain_destroy(&trans->ctx);
10231 case NFT_MSG_NEWRULE:
10232 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
10234 case NFT_MSG_NEWSET:
10235 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
10237 case NFT_MSG_NEWSETELEM:
10238 nft_set_elem_destroy(nft_trans_elem_set(trans),
10239 nft_trans_elem(trans).priv, true);
10241 case NFT_MSG_NEWOBJ:
10242 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
10244 case NFT_MSG_NEWFLOWTABLE:
10245 if (nft_trans_flowtable_update(trans))
10246 nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
10248 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
10254 static void nft_set_abort_update(struct list_head *set_update_list)
10256 struct nft_set *set, *next;
10258 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
10259 list_del_init(&set->pending_update);
10261 if (!set->ops->abort)
10264 set->ops->abort(set);
10268 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
10270 struct nftables_pernet *nft_net = nft_pernet(net);
10271 struct nft_trans *trans, *next;
10272 LIST_HEAD(set_update_list);
10273 struct nft_trans_elem *te;
10275 if (action == NFNL_ABORT_VALIDATE &&
10276 nf_tables_validate(net) < 0)
10279 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
10281 switch (trans->msg_type) {
10282 case NFT_MSG_NEWTABLE:
10283 if (nft_trans_table_update(trans)) {
10284 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
10285 nft_trans_destroy(trans);
10288 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
10289 nf_tables_table_disable(net, trans->ctx.table);
10290 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
10291 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
10292 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
10294 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
10295 nft_trans_destroy(trans);
10297 list_del_rcu(&trans->ctx.table->list);
10300 case NFT_MSG_DELTABLE:
10301 case NFT_MSG_DESTROYTABLE:
10302 nft_clear(trans->ctx.net, trans->ctx.table);
10303 nft_trans_destroy(trans);
10305 case NFT_MSG_NEWCHAIN:
10306 if (nft_trans_chain_update(trans)) {
10307 nft_netdev_unregister_hooks(net,
10308 &nft_trans_chain_hooks(trans),
10310 free_percpu(nft_trans_chain_stats(trans));
10311 kfree(nft_trans_chain_name(trans));
10312 nft_trans_destroy(trans);
10314 if (nft_trans_chain_bound(trans)) {
10315 nft_trans_destroy(trans);
10318 nft_use_dec_restore(&trans->ctx.table->use);
10319 nft_chain_del(trans->ctx.chain);
10320 nf_tables_unregister_hook(trans->ctx.net,
10325 case NFT_MSG_DELCHAIN:
10326 case NFT_MSG_DESTROYCHAIN:
10327 if (nft_trans_chain_update(trans)) {
10328 list_splice(&nft_trans_chain_hooks(trans),
10329 &nft_trans_basechain(trans)->hook_list);
10331 nft_use_inc_restore(&trans->ctx.table->use);
10332 nft_clear(trans->ctx.net, trans->ctx.chain);
10334 nft_trans_destroy(trans);
10336 case NFT_MSG_NEWRULE:
10337 if (nft_trans_rule_bound(trans)) {
10338 nft_trans_destroy(trans);
10341 nft_use_dec_restore(&trans->ctx.chain->use);
10342 list_del_rcu(&nft_trans_rule(trans)->list);
10343 nft_rule_expr_deactivate(&trans->ctx,
10344 nft_trans_rule(trans),
10346 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10347 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10349 case NFT_MSG_DELRULE:
10350 case NFT_MSG_DESTROYRULE:
10351 nft_use_inc_restore(&trans->ctx.chain->use);
10352 nft_clear(trans->ctx.net, nft_trans_rule(trans));
10353 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
10354 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
10355 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
10357 nft_trans_destroy(trans);
10359 case NFT_MSG_NEWSET:
10360 if (nft_trans_set_update(trans)) {
10361 nft_trans_destroy(trans);
10364 nft_use_dec_restore(&trans->ctx.table->use);
10365 if (nft_trans_set_bound(trans)) {
10366 nft_trans_destroy(trans);
10369 nft_trans_set(trans)->dead = 1;
10370 list_del_rcu(&nft_trans_set(trans)->list);
10372 case NFT_MSG_DELSET:
10373 case NFT_MSG_DESTROYSET:
10374 nft_use_inc_restore(&trans->ctx.table->use);
10375 nft_clear(trans->ctx.net, nft_trans_set(trans));
10376 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10377 nft_map_activate(&trans->ctx, nft_trans_set(trans));
10379 nft_trans_destroy(trans);
10381 case NFT_MSG_NEWSETELEM:
10382 if (nft_trans_elem_set_bound(trans)) {
10383 nft_trans_destroy(trans);
10386 te = (struct nft_trans_elem *)trans->data;
10387 nft_setelem_remove(net, te->set, &te->elem);
10388 if (!nft_setelem_is_catchall(te->set, &te->elem))
10389 atomic_dec(&te->set->nelems);
10391 if (te->set->ops->abort &&
10392 list_empty(&te->set->pending_update)) {
10393 list_add_tail(&te->set->pending_update,
10397 case NFT_MSG_DELSETELEM:
10398 case NFT_MSG_DESTROYSETELEM:
10399 te = (struct nft_trans_elem *)trans->data;
10401 nft_setelem_data_activate(net, te->set, &te->elem);
10402 nft_setelem_activate(net, te->set, &te->elem);
10403 if (!nft_setelem_is_catchall(te->set, &te->elem))
10406 if (te->set->ops->abort &&
10407 list_empty(&te->set->pending_update)) {
10408 list_add_tail(&te->set->pending_update,
10411 nft_trans_destroy(trans);
10413 case NFT_MSG_NEWOBJ:
10414 if (nft_trans_obj_update(trans)) {
10415 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
10416 nft_trans_destroy(trans);
10418 nft_use_dec_restore(&trans->ctx.table->use);
10419 nft_obj_del(nft_trans_obj(trans));
10422 case NFT_MSG_DELOBJ:
10423 case NFT_MSG_DESTROYOBJ:
10424 nft_use_inc_restore(&trans->ctx.table->use);
10425 nft_clear(trans->ctx.net, nft_trans_obj(trans));
10426 nft_trans_destroy(trans);
10428 case NFT_MSG_NEWFLOWTABLE:
10429 if (nft_trans_flowtable_update(trans)) {
10430 nft_unregister_flowtable_net_hooks(net,
10431 &nft_trans_flowtable_hooks(trans));
10433 nft_use_dec_restore(&trans->ctx.table->use);
10434 list_del_rcu(&nft_trans_flowtable(trans)->list);
10435 nft_unregister_flowtable_net_hooks(net,
10436 &nft_trans_flowtable(trans)->hook_list);
10439 case NFT_MSG_DELFLOWTABLE:
10440 case NFT_MSG_DESTROYFLOWTABLE:
10441 if (nft_trans_flowtable_update(trans)) {
10442 list_splice(&nft_trans_flowtable_hooks(trans),
10443 &nft_trans_flowtable(trans)->hook_list);
10445 nft_use_inc_restore(&trans->ctx.table->use);
10446 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
10448 nft_trans_destroy(trans);
10453 nft_set_abort_update(&set_update_list);
10457 list_for_each_entry_safe_reverse(trans, next,
10458 &nft_net->commit_list, list) {
10459 nft_trans_list_del(trans);
10460 nf_tables_abort_release(trans);
10463 if (action == NFNL_ABORT_AUTOLOAD)
10464 nf_tables_module_autoload(net);
10466 nf_tables_module_autoload_cleanup(net);
10471 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
10472 enum nfnl_abort_action action)
10474 struct nftables_pernet *nft_net = nft_pernet(net);
10475 unsigned int gc_seq;
10478 gc_seq = nft_gc_seq_begin(nft_net);
10479 ret = __nf_tables_abort(net, action);
10480 nft_gc_seq_end(nft_net, gc_seq);
10481 mutex_unlock(&nft_net->commit_mutex);
10486 static bool nf_tables_valid_genid(struct net *net, u32 genid)
10488 struct nftables_pernet *nft_net = nft_pernet(net);
10491 mutex_lock(&nft_net->commit_mutex);
10493 genid_ok = genid == 0 || nft_net->base_seq == genid;
10495 mutex_unlock(&nft_net->commit_mutex);
10497 /* else, commit mutex has to be released by commit or abort function */
10501 static const struct nfnetlink_subsystem nf_tables_subsys = {
10502 .name = "nf_tables",
10503 .subsys_id = NFNL_SUBSYS_NFTABLES,
10504 .cb_count = NFT_MSG_MAX,
10505 .cb = nf_tables_cb,
10506 .commit = nf_tables_commit,
10507 .abort = nf_tables_abort,
10508 .valid_genid = nf_tables_valid_genid,
10509 .owner = THIS_MODULE,
10512 int nft_chain_validate_dependency(const struct nft_chain *chain,
10513 enum nft_chain_types type)
10515 const struct nft_base_chain *basechain;
10517 if (nft_is_base_chain(chain)) {
10518 basechain = nft_base_chain(chain);
10519 if (basechain->type->type != type)
10520 return -EOPNOTSUPP;
10524 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
10526 int nft_chain_validate_hooks(const struct nft_chain *chain,
10527 unsigned int hook_flags)
10529 struct nft_base_chain *basechain;
10531 if (nft_is_base_chain(chain)) {
10532 basechain = nft_base_chain(chain);
10534 if ((1 << basechain->ops.hooknum) & hook_flags)
10537 return -EOPNOTSUPP;
10542 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
10545 * Loop detection - walk through the ruleset beginning at the destination chain
10546 * of a new jump until either the source chain is reached (loop) or all
10547 * reachable chains have been traversed.
10549 * The loop check is performed whenever a new jump verdict is added to an
10550 * expression or verdict map or a verdict map is bound to a new chain.
10553 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10554 const struct nft_chain *chain);
10556 static int nft_check_loops(const struct nft_ctx *ctx,
10557 const struct nft_set_ext *ext)
10559 const struct nft_data *data;
10562 data = nft_set_ext_data(ext);
10563 switch (data->verdict.code) {
10566 ret = nf_tables_check_loops(ctx, data->verdict.chain);
10576 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
10577 struct nft_set *set,
10578 const struct nft_set_iter *iter,
10579 struct nft_set_elem *elem)
10581 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
10583 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
10584 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
10587 return nft_check_loops(ctx, ext);
10590 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
10591 struct nft_set *set)
10593 u8 genmask = nft_genmask_next(ctx->net);
10594 struct nft_set_elem_catchall *catchall;
10595 struct nft_set_ext *ext;
10598 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
10599 ext = nft_set_elem_ext(set, catchall->elem);
10600 if (!nft_set_elem_active(ext, genmask))
10603 ret = nft_check_loops(ctx, ext);
10611 static int nf_tables_check_loops(const struct nft_ctx *ctx,
10612 const struct nft_chain *chain)
10614 const struct nft_rule *rule;
10615 const struct nft_expr *expr, *last;
10616 struct nft_set *set;
10617 struct nft_set_binding *binding;
10618 struct nft_set_iter iter;
10620 if (ctx->chain == chain)
10623 if (fatal_signal_pending(current))
10626 list_for_each_entry(rule, &chain->rules, list) {
10627 nft_rule_for_each_expr(expr, last, rule) {
10628 struct nft_immediate_expr *priv;
10629 const struct nft_data *data;
10632 if (strcmp(expr->ops->type->name, "immediate"))
10635 priv = nft_expr_priv(expr);
10636 if (priv->dreg != NFT_REG_VERDICT)
10639 data = &priv->data;
10640 switch (data->verdict.code) {
10643 err = nf_tables_check_loops(ctx,
10644 data->verdict.chain);
10654 list_for_each_entry(set, &ctx->table->sets, list) {
10655 if (!nft_is_active_next(ctx->net, set))
10657 if (!(set->flags & NFT_SET_MAP) ||
10658 set->dtype != NFT_DATA_VERDICT)
10661 list_for_each_entry(binding, &set->bindings, list) {
10662 if (!(binding->flags & NFT_SET_MAP) ||
10663 binding->chain != chain)
10666 iter.genmask = nft_genmask_next(ctx->net);
10670 iter.fn = nf_tables_loop_check_setelem;
10672 set->ops->walk(ctx, set, &iter);
10674 iter.err = nft_set_catchall_loops(ctx, set);
10685 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
10687 * @attr: netlink attribute to fetch value from
10688 * @max: maximum value to be stored in dest
10689 * @dest: pointer to the variable
10691 * Parse, check and store a given u32 netlink attribute into variable.
10692 * This function returns -ERANGE if the value goes over maximum value.
10693 * Otherwise a 0 is returned and the attribute value is stored in the
10694 * destination variable.
10696 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
10700 val = ntohl(nla_get_be32(attr));
10707 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
10709 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
10713 reg = ntohl(nla_get_be32(attr));
10715 case NFT_REG_VERDICT...NFT_REG_4:
10716 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
10718 case NFT_REG32_00...NFT_REG32_15:
10719 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
10729 * nft_dump_register - dump a register value to a netlink attribute
10731 * @skb: socket buffer
10732 * @attr: attribute number
10733 * @reg: register number
10735 * Construct a netlink attribute containing the register number. For
10736 * compatibility reasons, register numbers being a multiple of 4 are
10737 * translated to the corresponding 128 bit register numbers.
10739 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
10741 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
10742 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
10744 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
10746 return nla_put_be32(skb, attr, htonl(reg));
10748 EXPORT_SYMBOL_GPL(nft_dump_register);
10750 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
10752 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10756 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
10762 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
10767 err = nft_parse_register(attr, ®);
10771 err = nft_validate_register_load(reg, len);
10778 EXPORT_SYMBOL_GPL(nft_parse_register_load);
10780 static int nft_validate_register_store(const struct nft_ctx *ctx,
10781 enum nft_registers reg,
10782 const struct nft_data *data,
10783 enum nft_data_types type,
10789 case NFT_REG_VERDICT:
10790 if (type != NFT_DATA_VERDICT)
10793 if (data != NULL &&
10794 (data->verdict.code == NFT_GOTO ||
10795 data->verdict.code == NFT_JUMP)) {
10796 err = nf_tables_check_loops(ctx, data->verdict.chain);
10803 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10807 if (reg * NFT_REG32_SIZE + len >
10808 sizeof_field(struct nft_regs, data))
10811 if (data != NULL && type != NFT_DATA_VALUE)
10817 int nft_parse_register_store(const struct nft_ctx *ctx,
10818 const struct nlattr *attr, u8 *dreg,
10819 const struct nft_data *data,
10820 enum nft_data_types type, unsigned int len)
10825 err = nft_parse_register(attr, ®);
10829 err = nft_validate_register_store(ctx, reg, data, type, len);
10836 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10838 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10839 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10840 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10841 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10842 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10845 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10846 struct nft_data_desc *desc, const struct nlattr *nla)
10848 u8 genmask = nft_genmask_next(ctx->net);
10849 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10850 struct nft_chain *chain;
10853 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10854 nft_verdict_policy, NULL);
10858 if (!tb[NFTA_VERDICT_CODE])
10861 /* zero padding hole for memcmp */
10862 memset(data, 0, sizeof(*data));
10863 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10865 switch (data->verdict.code) {
10867 switch (data->verdict.code & NF_VERDICT_MASK) {
10882 if (tb[NFTA_VERDICT_CHAIN]) {
10883 chain = nft_chain_lookup(ctx->net, ctx->table,
10884 tb[NFTA_VERDICT_CHAIN],
10886 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10887 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10888 tb[NFTA_VERDICT_CHAIN_ID],
10891 return PTR_ERR(chain);
10897 return PTR_ERR(chain);
10898 if (nft_is_base_chain(chain))
10899 return -EOPNOTSUPP;
10900 if (nft_chain_is_bound(chain))
10902 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10903 chain->flags & NFT_CHAIN_BINDING)
10905 if (!nft_use_inc(&chain->use))
10908 data->verdict.chain = chain;
10912 desc->len = sizeof(data->verdict);
10917 static void nft_verdict_uninit(const struct nft_data *data)
10919 struct nft_chain *chain;
10921 switch (data->verdict.code) {
10924 chain = data->verdict.chain;
10925 nft_use_dec(&chain->use);
10930 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10932 struct nlattr *nest;
10934 nest = nla_nest_start_noflag(skb, type);
10936 goto nla_put_failure;
10938 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10939 goto nla_put_failure;
10944 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10946 goto nla_put_failure;
10948 nla_nest_end(skb, nest);
10955 static int nft_value_init(const struct nft_ctx *ctx,
10956 struct nft_data *data, struct nft_data_desc *desc,
10957 const struct nlattr *nla)
10961 len = nla_len(nla);
10964 if (len > desc->size)
10967 if (len != desc->len)
10973 nla_memcpy(data->data, nla, len);
10978 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10981 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10984 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10985 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10986 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10990 * nft_data_init - parse nf_tables data netlink attributes
10992 * @ctx: context of the expression using the data
10993 * @data: destination struct nft_data
10994 * @desc: data description
10995 * @nla: netlink attribute containing data
10997 * Parse the netlink data attributes and initialize a struct nft_data.
10998 * The type and length of data are returned in the data description.
11000 * The caller can indicate that it only wants to accept data of type
11001 * NFT_DATA_VALUE by passing NULL for the ctx argument.
11003 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
11004 struct nft_data_desc *desc, const struct nlattr *nla)
11006 struct nlattr *tb[NFTA_DATA_MAX + 1];
11009 if (WARN_ON_ONCE(!desc->size))
11012 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
11013 nft_data_policy, NULL);
11017 if (tb[NFTA_DATA_VALUE]) {
11018 if (desc->type != NFT_DATA_VALUE)
11021 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
11022 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
11023 if (desc->type != NFT_DATA_VERDICT)
11026 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
11033 EXPORT_SYMBOL_GPL(nft_data_init);
11036 * nft_data_release - release a nft_data item
11038 * @data: struct nft_data to release
11039 * @type: type of data
11041 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
11042 * all others need to be released by calling this function.
11044 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
11046 if (type < NFT_DATA_VERDICT)
11049 case NFT_DATA_VERDICT:
11050 return nft_verdict_uninit(data);
11055 EXPORT_SYMBOL_GPL(nft_data_release);
11057 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
11058 enum nft_data_types type, unsigned int len)
11060 struct nlattr *nest;
11063 nest = nla_nest_start_noflag(skb, attr);
11068 case NFT_DATA_VALUE:
11069 err = nft_value_dump(skb, data, len);
11071 case NFT_DATA_VERDICT:
11072 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
11079 nla_nest_end(skb, nest);
11082 EXPORT_SYMBOL_GPL(nft_data_dump);
11084 int __nft_release_basechain(struct nft_ctx *ctx)
11086 struct nft_rule *rule, *nr;
11088 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
11091 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
11092 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
11093 list_del(&rule->list);
11094 nft_use_dec(&ctx->chain->use);
11095 nf_tables_rule_release(ctx, rule);
11097 nft_chain_del(ctx->chain);
11098 nft_use_dec(&ctx->table->use);
11099 nf_tables_chain_destroy(ctx);
11103 EXPORT_SYMBOL_GPL(__nft_release_basechain);
11105 static void __nft_release_hook(struct net *net, struct nft_table *table)
11107 struct nft_flowtable *flowtable;
11108 struct nft_chain *chain;
11110 list_for_each_entry(chain, &table->chains, list)
11111 __nf_tables_unregister_hook(net, table, chain, true);
11112 list_for_each_entry(flowtable, &table->flowtables, list)
11113 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
11117 static void __nft_release_hooks(struct net *net)
11119 struct nftables_pernet *nft_net = nft_pernet(net);
11120 struct nft_table *table;
11122 list_for_each_entry(table, &nft_net->tables, list) {
11123 if (nft_table_has_owner(table))
11126 __nft_release_hook(net, table);
11130 static void __nft_release_table(struct net *net, struct nft_table *table)
11132 struct nft_flowtable *flowtable, *nf;
11133 struct nft_chain *chain, *nc;
11134 struct nft_object *obj, *ne;
11135 struct nft_rule *rule, *nr;
11136 struct nft_set *set, *ns;
11137 struct nft_ctx ctx = {
11139 .family = NFPROTO_NETDEV,
11142 ctx.family = table->family;
11144 list_for_each_entry(chain, &table->chains, list) {
11145 if (nft_chain_binding(chain))
11149 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
11150 list_del(&rule->list);
11151 nft_use_dec(&chain->use);
11152 nf_tables_rule_release(&ctx, rule);
11155 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
11156 list_del(&flowtable->list);
11157 nft_use_dec(&table->use);
11158 nf_tables_flowtable_destroy(flowtable);
11160 list_for_each_entry_safe(set, ns, &table->sets, list) {
11161 list_del(&set->list);
11162 nft_use_dec(&table->use);
11163 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
11164 nft_map_deactivate(&ctx, set);
11166 nft_set_destroy(&ctx, set);
11168 list_for_each_entry_safe(obj, ne, &table->objects, list) {
11170 nft_use_dec(&table->use);
11171 nft_obj_destroy(&ctx, obj);
11173 list_for_each_entry_safe(chain, nc, &table->chains, list) {
11175 nft_chain_del(chain);
11176 nft_use_dec(&table->use);
11177 nf_tables_chain_destroy(&ctx);
11179 nf_tables_table_destroy(&ctx);
11182 static void __nft_release_tables(struct net *net)
11184 struct nftables_pernet *nft_net = nft_pernet(net);
11185 struct nft_table *table, *nt;
11187 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
11188 if (nft_table_has_owner(table))
11191 list_del(&table->list);
11193 __nft_release_table(net, table);
11197 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
11200 struct nft_table *table, *to_delete[8];
11201 struct nftables_pernet *nft_net;
11202 struct netlink_notify *n = ptr;
11203 struct net *net = n->net;
11204 unsigned int deleted;
11205 bool restart = false;
11206 unsigned int gc_seq;
11208 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
11209 return NOTIFY_DONE;
11211 nft_net = nft_pernet(net);
11213 mutex_lock(&nft_net->commit_mutex);
11215 gc_seq = nft_gc_seq_begin(nft_net);
11217 if (!list_empty(&nf_tables_destroy_list))
11218 nf_tables_trans_destroy_flush_work();
11220 list_for_each_entry(table, &nft_net->tables, list) {
11221 if (nft_table_has_owner(table) &&
11222 n->portid == table->nlpid) {
11223 __nft_release_hook(net, table);
11224 list_del_rcu(&table->list);
11225 to_delete[deleted++] = table;
11226 if (deleted >= ARRAY_SIZE(to_delete))
11231 restart = deleted >= ARRAY_SIZE(to_delete);
11234 __nft_release_table(net, to_delete[--deleted]);
11239 nft_gc_seq_end(nft_net, gc_seq);
11241 mutex_unlock(&nft_net->commit_mutex);
11243 return NOTIFY_DONE;
11246 static struct notifier_block nft_nl_notifier = {
11247 .notifier_call = nft_rcv_nl_event,
11250 static int __net_init nf_tables_init_net(struct net *net)
11252 struct nftables_pernet *nft_net = nft_pernet(net);
11254 INIT_LIST_HEAD(&nft_net->tables);
11255 INIT_LIST_HEAD(&nft_net->commit_list);
11256 INIT_LIST_HEAD(&nft_net->binding_list);
11257 INIT_LIST_HEAD(&nft_net->module_list);
11258 INIT_LIST_HEAD(&nft_net->notify_list);
11259 mutex_init(&nft_net->commit_mutex);
11260 nft_net->base_seq = 1;
11261 nft_net->gc_seq = 0;
11262 nft_net->validate_state = NFT_VALIDATE_SKIP;
11267 static void __net_exit nf_tables_pre_exit_net(struct net *net)
11269 struct nftables_pernet *nft_net = nft_pernet(net);
11271 mutex_lock(&nft_net->commit_mutex);
11272 __nft_release_hooks(net);
11273 mutex_unlock(&nft_net->commit_mutex);
11276 static void __net_exit nf_tables_exit_net(struct net *net)
11278 struct nftables_pernet *nft_net = nft_pernet(net);
11279 unsigned int gc_seq;
11281 mutex_lock(&nft_net->commit_mutex);
11283 gc_seq = nft_gc_seq_begin(nft_net);
11285 if (!list_empty(&nft_net->commit_list) ||
11286 !list_empty(&nft_net->module_list))
11287 __nf_tables_abort(net, NFNL_ABORT_NONE);
11289 __nft_release_tables(net);
11291 nft_gc_seq_end(nft_net, gc_seq);
11293 mutex_unlock(&nft_net->commit_mutex);
11294 WARN_ON_ONCE(!list_empty(&nft_net->tables));
11295 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
11296 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
11299 static void nf_tables_exit_batch(struct list_head *net_exit_list)
11301 flush_work(&trans_gc_work);
11304 static struct pernet_operations nf_tables_net_ops = {
11305 .init = nf_tables_init_net,
11306 .pre_exit = nf_tables_pre_exit_net,
11307 .exit = nf_tables_exit_net,
11308 .exit_batch = nf_tables_exit_batch,
11309 .id = &nf_tables_net_id,
11310 .size = sizeof(struct nftables_pernet),
11313 static int __init nf_tables_module_init(void)
11317 err = register_pernet_subsys(&nf_tables_net_ops);
11321 err = nft_chain_filter_init();
11323 goto err_chain_filter;
11325 err = nf_tables_core_module_init();
11327 goto err_core_module;
11329 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
11331 goto err_netdev_notifier;
11333 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
11335 goto err_rht_objname;
11337 err = nft_offload_init();
11341 err = netlink_register_notifier(&nft_nl_notifier);
11343 goto err_netlink_notifier;
11346 err = nfnetlink_subsys_register(&nf_tables_subsys);
11348 goto err_nfnl_subsys;
11350 nft_chain_route_init();
11355 netlink_unregister_notifier(&nft_nl_notifier);
11356 err_netlink_notifier:
11357 nft_offload_exit();
11359 rhltable_destroy(&nft_objname_ht);
11361 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11362 err_netdev_notifier:
11363 nf_tables_core_module_exit();
11365 nft_chain_filter_fini();
11367 unregister_pernet_subsys(&nf_tables_net_ops);
11371 static void __exit nf_tables_module_exit(void)
11373 nfnetlink_subsys_unregister(&nf_tables_subsys);
11374 netlink_unregister_notifier(&nft_nl_notifier);
11375 nft_offload_exit();
11376 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
11377 nft_chain_filter_fini();
11378 nft_chain_route_fini();
11379 unregister_pernet_subsys(&nf_tables_net_ops);
11380 cancel_work_sync(&trans_gc_work);
11381 cancel_work_sync(&trans_destroy_work);
11383 rhltable_destroy(&nft_objname_ht);
11384 nf_tables_core_module_exit();
11387 module_init(nf_tables_module_init);
11388 module_exit(nf_tables_module_exit);
11390 MODULE_LICENSE("GPL");
11391 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
11392 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);