1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107 struct nftables_pernet *nft_net = nft_pernet(net);
109 switch (nft_net->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 case NFT_VALIDATE_NEED:
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
120 nft_net->validate_state = new_validate_state;
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125 static void nft_ctx_init(struct nft_ctx *ctx,
127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
135 ctx->family = family;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
142 ctx->flags = nlh->nlmsg_flags;
143 ctx->seq = nlh->nlmsg_seq;
146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
149 struct nft_trans *trans;
151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
155 INIT_LIST_HEAD(&trans->list);
156 trans->msg_type = msg_type;
162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
168 static void nft_trans_destroy(struct nft_trans *trans)
170 list_del(&trans->list);
174 static void __nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set,
177 struct nftables_pernet *nft_net;
178 struct net *net = ctx->net;
179 struct nft_trans *trans;
181 if (!nft_set_is_anonymous(set))
184 nft_net = nft_pernet(net);
185 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
186 switch (trans->msg_type) {
188 if (nft_trans_set(trans) == set)
189 nft_trans_set_bound(trans) = bind;
191 case NFT_MSG_NEWSETELEM:
192 if (nft_trans_elem_set(trans) == set)
193 nft_trans_elem_set_bound(trans) = bind;
199 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
201 return __nft_set_trans_bind(ctx, set, true);
204 static void nft_set_trans_unbind(const struct nft_ctx *ctx, struct nft_set *set)
206 return __nft_set_trans_bind(ctx, set, false);
209 static void __nft_chain_trans_bind(const struct nft_ctx *ctx,
210 struct nft_chain *chain, bool bind)
212 struct nftables_pernet *nft_net;
213 struct net *net = ctx->net;
214 struct nft_trans *trans;
216 if (!nft_chain_binding(chain))
219 nft_net = nft_pernet(net);
220 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
221 switch (trans->msg_type) {
222 case NFT_MSG_NEWCHAIN:
223 if (nft_trans_chain(trans) == chain)
224 nft_trans_chain_bound(trans) = bind;
226 case NFT_MSG_NEWRULE:
227 if (trans->ctx.chain == chain)
228 nft_trans_rule_bound(trans) = bind;
234 static void nft_chain_trans_bind(const struct nft_ctx *ctx,
235 struct nft_chain *chain)
237 __nft_chain_trans_bind(ctx, chain, true);
240 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
242 if (!nft_chain_binding(chain))
245 if (nft_chain_binding(ctx->chain))
253 nft_chain_trans_bind(ctx, chain);
258 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain)
260 __nft_chain_trans_bind(ctx, chain, false);
263 static int nft_netdev_register_hooks(struct net *net,
264 struct list_head *hook_list)
266 struct nft_hook *hook;
270 list_for_each_entry(hook, hook_list, list) {
271 err = nf_register_net_hook(net, &hook->ops);
280 list_for_each_entry(hook, hook_list, list) {
284 nf_unregister_net_hook(net, &hook->ops);
289 static void nft_netdev_unregister_hooks(struct net *net,
290 struct list_head *hook_list,
293 struct nft_hook *hook, *next;
295 list_for_each_entry_safe(hook, next, hook_list, list) {
296 nf_unregister_net_hook(net, &hook->ops);
297 if (release_netdev) {
298 list_del(&hook->list);
299 kfree_rcu(hook, rcu);
304 static int nf_tables_register_hook(struct net *net,
305 const struct nft_table *table,
306 struct nft_chain *chain)
308 struct nft_base_chain *basechain;
309 const struct nf_hook_ops *ops;
311 if (table->flags & NFT_TABLE_F_DORMANT ||
312 !nft_is_base_chain(chain))
315 basechain = nft_base_chain(chain);
316 ops = &basechain->ops;
318 if (basechain->type->ops_register)
319 return basechain->type->ops_register(net, ops);
321 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
322 return nft_netdev_register_hooks(net, &basechain->hook_list);
324 return nf_register_net_hook(net, &basechain->ops);
327 static void __nf_tables_unregister_hook(struct net *net,
328 const struct nft_table *table,
329 struct nft_chain *chain,
332 struct nft_base_chain *basechain;
333 const struct nf_hook_ops *ops;
335 if (table->flags & NFT_TABLE_F_DORMANT ||
336 !nft_is_base_chain(chain))
338 basechain = nft_base_chain(chain);
339 ops = &basechain->ops;
341 if (basechain->type->ops_unregister)
342 return basechain->type->ops_unregister(net, ops);
344 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
345 nft_netdev_unregister_hooks(net, &basechain->hook_list,
348 nf_unregister_net_hook(net, &basechain->ops);
351 static void nf_tables_unregister_hook(struct net *net,
352 const struct nft_table *table,
353 struct nft_chain *chain)
355 return __nf_tables_unregister_hook(net, table, chain, false);
358 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
360 struct nftables_pernet *nft_net = nft_pernet(net);
362 list_add_tail(&trans->list, &nft_net->commit_list);
365 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
367 struct nft_trans *trans;
369 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
373 if (msg_type == NFT_MSG_NEWTABLE)
374 nft_activate_next(ctx->net, ctx->table);
376 nft_trans_commit_list_add_tail(ctx->net, trans);
380 static int nft_deltable(struct nft_ctx *ctx)
384 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
388 nft_deactivate_next(ctx->net, ctx->table);
392 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
394 struct nft_trans *trans;
396 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
398 return ERR_PTR(-ENOMEM);
400 if (msg_type == NFT_MSG_NEWCHAIN) {
401 nft_activate_next(ctx->net, ctx->chain);
403 if (ctx->nla[NFTA_CHAIN_ID]) {
404 nft_trans_chain_id(trans) =
405 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
408 nft_trans_chain(trans) = ctx->chain;
409 nft_trans_commit_list_add_tail(ctx->net, trans);
414 static int nft_delchain(struct nft_ctx *ctx)
416 struct nft_trans *trans;
418 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
420 return PTR_ERR(trans);
423 nft_deactivate_next(ctx->net, ctx->chain);
428 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule)
430 struct nft_expr *expr;
432 expr = nft_expr_first(rule);
433 while (nft_expr_more(rule, expr)) {
434 if (expr->ops->activate)
435 expr->ops->activate(ctx, expr);
437 expr = nft_expr_next(expr);
441 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
442 enum nft_trans_phase phase)
444 struct nft_expr *expr;
446 expr = nft_expr_first(rule);
447 while (nft_expr_more(rule, expr)) {
448 if (expr->ops->deactivate)
449 expr->ops->deactivate(ctx, expr, phase);
451 expr = nft_expr_next(expr);
456 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
458 /* You cannot delete the same rule twice */
459 if (nft_is_active_next(ctx->net, rule)) {
460 nft_deactivate_next(ctx->net, rule);
467 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
468 struct nft_rule *rule)
470 struct nft_trans *trans;
472 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
476 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
477 nft_trans_rule_id(trans) =
478 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
480 nft_trans_rule(trans) = rule;
481 nft_trans_commit_list_add_tail(ctx->net, trans);
486 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
488 struct nft_flow_rule *flow;
489 struct nft_trans *trans;
492 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
496 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
497 flow = nft_flow_rule_create(ctx->net, rule);
499 nft_trans_destroy(trans);
500 return PTR_ERR(flow);
503 nft_trans_flow_rule(trans) = flow;
506 err = nf_tables_delrule_deactivate(ctx, rule);
508 nft_trans_destroy(trans);
511 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
516 static int nft_delrule_by_chain(struct nft_ctx *ctx)
518 struct nft_rule *rule;
521 list_for_each_entry(rule, &ctx->chain->rules, list) {
522 if (!nft_is_active_next(ctx->net, rule))
525 err = nft_delrule(ctx, rule);
532 static int __nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
534 const struct nft_set_desc *desc)
536 struct nft_trans *trans;
538 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
542 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] && !desc) {
543 nft_trans_set_id(trans) =
544 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
545 nft_activate_next(ctx->net, set);
547 nft_trans_set(trans) = set;
549 nft_trans_set_update(trans) = true;
550 nft_trans_set_gc_int(trans) = desc->gc_int;
551 nft_trans_set_timeout(trans) = desc->timeout;
553 nft_trans_commit_list_add_tail(ctx->net, trans);
558 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
561 return __nft_trans_set_add(ctx, msg_type, set, NULL);
564 static void nft_setelem_data_deactivate(const struct net *net,
565 const struct nft_set *set,
566 struct nft_set_elem *elem);
568 static int nft_mapelem_deactivate(const struct nft_ctx *ctx,
570 const struct nft_set_iter *iter,
571 struct nft_set_elem *elem)
573 nft_setelem_data_deactivate(ctx->net, set, elem);
578 struct nft_set_elem_catchall {
579 struct list_head list;
584 static void nft_map_catchall_deactivate(const struct nft_ctx *ctx,
587 u8 genmask = nft_genmask_next(ctx->net);
588 struct nft_set_elem_catchall *catchall;
589 struct nft_set_elem elem;
590 struct nft_set_ext *ext;
592 list_for_each_entry(catchall, &set->catchall_list, list) {
593 ext = nft_set_elem_ext(set, catchall->elem);
594 if (!nft_set_elem_active(ext, genmask))
597 elem.priv = catchall->elem;
598 nft_setelem_data_deactivate(ctx->net, set, &elem);
603 static void nft_map_deactivate(const struct nft_ctx *ctx, struct nft_set *set)
605 struct nft_set_iter iter = {
606 .genmask = nft_genmask_next(ctx->net),
607 .fn = nft_mapelem_deactivate,
610 set->ops->walk(ctx, set, &iter);
611 WARN_ON_ONCE(iter.err);
613 nft_map_catchall_deactivate(ctx, set);
616 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
620 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
624 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
625 nft_map_deactivate(ctx, set);
627 nft_deactivate_next(ctx->net, set);
633 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
634 struct nft_object *obj)
636 struct nft_trans *trans;
638 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
642 if (msg_type == NFT_MSG_NEWOBJ)
643 nft_activate_next(ctx->net, obj);
645 nft_trans_obj(trans) = obj;
646 nft_trans_commit_list_add_tail(ctx->net, trans);
651 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
655 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
659 nft_deactivate_next(ctx->net, obj);
665 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
666 struct nft_flowtable *flowtable)
668 struct nft_trans *trans;
670 trans = nft_trans_alloc(ctx, msg_type,
671 sizeof(struct nft_trans_flowtable));
675 if (msg_type == NFT_MSG_NEWFLOWTABLE)
676 nft_activate_next(ctx->net, flowtable);
678 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
679 nft_trans_flowtable(trans) = flowtable;
680 nft_trans_commit_list_add_tail(ctx->net, trans);
685 static int nft_delflowtable(struct nft_ctx *ctx,
686 struct nft_flowtable *flowtable)
690 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
694 nft_deactivate_next(ctx->net, flowtable);
700 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
704 for (i = track->regs[dreg].num_reg; i > 0; i--)
705 __nft_reg_track_cancel(track, dreg - i);
708 static void __nft_reg_track_update(struct nft_regs_track *track,
709 const struct nft_expr *expr,
712 track->regs[dreg].selector = expr;
713 track->regs[dreg].bitwise = NULL;
714 track->regs[dreg].num_reg = num_reg;
717 void nft_reg_track_update(struct nft_regs_track *track,
718 const struct nft_expr *expr, u8 dreg, u8 len)
720 unsigned int regcount;
723 __nft_reg_track_clobber(track, dreg);
725 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
726 for (i = 0; i < regcount; i++, dreg++)
727 __nft_reg_track_update(track, expr, dreg, i);
729 EXPORT_SYMBOL_GPL(nft_reg_track_update);
731 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
733 unsigned int regcount;
736 __nft_reg_track_clobber(track, dreg);
738 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
739 for (i = 0; i < regcount; i++, dreg++)
740 __nft_reg_track_cancel(track, dreg);
742 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
744 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
746 track->regs[dreg].selector = NULL;
747 track->regs[dreg].bitwise = NULL;
748 track->regs[dreg].num_reg = 0;
750 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
756 static struct nft_table *nft_table_lookup(const struct net *net,
757 const struct nlattr *nla,
758 u8 family, u8 genmask, u32 nlpid)
760 struct nftables_pernet *nft_net;
761 struct nft_table *table;
764 return ERR_PTR(-EINVAL);
766 nft_net = nft_pernet(net);
767 list_for_each_entry_rcu(table, &nft_net->tables, list,
768 lockdep_is_held(&nft_net->commit_mutex)) {
769 if (!nla_strcmp(nla, table->name) &&
770 table->family == family &&
771 nft_active_genmask(table, genmask)) {
772 if (nft_table_has_owner(table) &&
773 nlpid && table->nlpid != nlpid)
774 return ERR_PTR(-EPERM);
780 return ERR_PTR(-ENOENT);
783 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
784 const struct nlattr *nla,
785 u8 genmask, u32 nlpid)
787 struct nftables_pernet *nft_net;
788 struct nft_table *table;
790 nft_net = nft_pernet(net);
791 list_for_each_entry(table, &nft_net->tables, list) {
792 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
793 nft_active_genmask(table, genmask)) {
794 if (nft_table_has_owner(table) &&
795 nlpid && table->nlpid != nlpid)
796 return ERR_PTR(-EPERM);
802 return ERR_PTR(-ENOENT);
805 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
807 return ++table->hgenerator;
810 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
812 static const struct nft_chain_type *
813 __nft_chain_type_get(u8 family, enum nft_chain_types type)
815 if (family >= NFPROTO_NUMPROTO ||
816 type >= NFT_CHAIN_T_MAX)
819 return chain_type[family][type];
822 static const struct nft_chain_type *
823 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
825 const struct nft_chain_type *type;
828 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
829 type = __nft_chain_type_get(family, i);
832 if (!nla_strcmp(nla, type->name))
838 struct nft_module_request {
839 struct list_head list;
840 char module[MODULE_NAME_LEN];
844 #ifdef CONFIG_MODULES
845 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
848 char module_name[MODULE_NAME_LEN];
849 struct nftables_pernet *nft_net;
850 struct nft_module_request *req;
855 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
857 if (ret >= MODULE_NAME_LEN)
860 nft_net = nft_pernet(net);
861 list_for_each_entry(req, &nft_net->module_list, list) {
862 if (!strcmp(req->module, module_name)) {
866 /* A request to load this module already exists. */
871 req = kmalloc(sizeof(*req), GFP_KERNEL);
876 strscpy(req->module, module_name, MODULE_NAME_LEN);
877 list_add_tail(&req->list, &nft_net->module_list);
881 EXPORT_SYMBOL_GPL(nft_request_module);
884 static void lockdep_nfnl_nft_mutex_not_held(void)
886 #ifdef CONFIG_PROVE_LOCKING
888 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
892 static const struct nft_chain_type *
893 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
894 u8 family, bool autoload)
896 const struct nft_chain_type *type;
898 type = __nf_tables_chain_type_lookup(nla, family);
902 lockdep_nfnl_nft_mutex_not_held();
903 #ifdef CONFIG_MODULES
905 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
907 (const char *)nla_data(nla)) == -EAGAIN)
908 return ERR_PTR(-EAGAIN);
911 return ERR_PTR(-ENOENT);
914 static __be16 nft_base_seq(const struct net *net)
916 struct nftables_pernet *nft_net = nft_pernet(net);
918 return htons(nft_net->base_seq & 0xffff);
921 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
922 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
923 .len = NFT_TABLE_MAXNAMELEN - 1 },
924 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
925 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
926 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
927 .len = NFT_USERDATA_MAXLEN }
930 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
931 u32 portid, u32 seq, int event, u32 flags,
932 int family, const struct nft_table *table)
934 struct nlmsghdr *nlh;
936 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
937 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
938 NFNETLINK_V0, nft_base_seq(net));
940 goto nla_put_failure;
942 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
943 nla_put_be32(skb, NFTA_TABLE_FLAGS,
944 htonl(table->flags & NFT_TABLE_F_MASK)) ||
945 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
946 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
948 goto nla_put_failure;
949 if (nft_table_has_owner(table) &&
950 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
951 goto nla_put_failure;
954 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
955 goto nla_put_failure;
962 nlmsg_trim(skb, nlh);
966 struct nftnl_skb_parms {
969 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
971 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
972 struct list_head *notify_list)
974 NFT_CB(skb).report = report;
975 list_add_tail(&skb->list, notify_list);
978 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
980 struct nftables_pernet *nft_net;
986 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
989 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
993 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
994 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
996 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
997 event, flags, ctx->family, ctx->table);
1003 nft_net = nft_pernet(ctx->net);
1004 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1007 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1010 static int nf_tables_dump_tables(struct sk_buff *skb,
1011 struct netlink_callback *cb)
1013 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1014 struct nftables_pernet *nft_net;
1015 const struct nft_table *table;
1016 unsigned int idx = 0, s_idx = cb->args[0];
1017 struct net *net = sock_net(skb->sk);
1018 int family = nfmsg->nfgen_family;
1021 nft_net = nft_pernet(net);
1022 cb->seq = READ_ONCE(nft_net->base_seq);
1024 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1025 if (family != NFPROTO_UNSPEC && family != table->family)
1031 memset(&cb->args[1], 0,
1032 sizeof(cb->args) - sizeof(cb->args[0]));
1033 if (!nft_is_active(net, table))
1035 if (nf_tables_fill_table_info(skb, net,
1036 NETLINK_CB(cb->skb).portid,
1038 NFT_MSG_NEWTABLE, NLM_F_MULTI,
1039 table->family, table) < 0)
1042 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1052 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
1053 const struct nlmsghdr *nlh,
1054 struct netlink_dump_control *c)
1058 if (!try_module_get(THIS_MODULE))
1062 err = netlink_dump_start(nlsk, skb, nlh, c);
1064 module_put(THIS_MODULE);
1069 /* called with rcu_read_lock held */
1070 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
1071 const struct nlattr * const nla[])
1073 struct netlink_ext_ack *extack = info->extack;
1074 u8 genmask = nft_genmask_cur(info->net);
1075 u8 family = info->nfmsg->nfgen_family;
1076 const struct nft_table *table;
1077 struct net *net = info->net;
1078 struct sk_buff *skb2;
1081 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1082 struct netlink_dump_control c = {
1083 .dump = nf_tables_dump_tables,
1084 .module = THIS_MODULE,
1087 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1090 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
1091 if (IS_ERR(table)) {
1092 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
1093 return PTR_ERR(table);
1096 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1100 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
1101 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
1104 goto err_fill_table_info;
1106 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1108 err_fill_table_info:
1113 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
1115 struct nft_chain *chain;
1118 list_for_each_entry(chain, &table->chains, list) {
1119 if (!nft_is_active_next(net, chain))
1121 if (!nft_is_base_chain(chain))
1124 if (cnt && i++ == cnt)
1127 nf_tables_unregister_hook(net, table, chain);
1131 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1133 struct nft_chain *chain;
1136 list_for_each_entry(chain, &table->chains, list) {
1137 if (!nft_is_active_next(net, chain))
1139 if (!nft_is_base_chain(chain))
1142 err = nf_tables_register_hook(net, table, chain);
1144 goto err_register_hooks;
1152 nft_table_disable(net, table, i);
1156 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1158 table->flags &= ~NFT_TABLE_F_DORMANT;
1159 nft_table_disable(net, table, 0);
1160 table->flags |= NFT_TABLE_F_DORMANT;
1163 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1164 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1165 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1166 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1167 __NFT_TABLE_F_WAS_AWAKEN)
1169 static int nf_tables_updtable(struct nft_ctx *ctx)
1171 struct nft_trans *trans;
1175 if (!ctx->nla[NFTA_TABLE_FLAGS])
1178 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1179 if (flags & ~NFT_TABLE_F_MASK)
1182 if (flags == ctx->table->flags)
1185 if ((nft_table_has_owner(ctx->table) &&
1186 !(flags & NFT_TABLE_F_OWNER)) ||
1187 (!nft_table_has_owner(ctx->table) &&
1188 flags & NFT_TABLE_F_OWNER))
1191 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1192 sizeof(struct nft_trans_table));
1196 if ((flags & NFT_TABLE_F_DORMANT) &&
1197 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1198 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1199 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1200 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1201 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1202 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1203 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1204 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1205 ret = nf_tables_table_enable(ctx->net, ctx->table);
1207 goto err_register_hooks;
1209 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1213 nft_trans_table_update(trans) = true;
1214 nft_trans_commit_list_add_tail(ctx->net, trans);
1219 nft_trans_destroy(trans);
1223 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1225 const char *name = data;
1227 return jhash(name, strlen(name), seed);
1230 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1232 const struct nft_chain *chain = data;
1234 return nft_chain_hash(chain->name, 0, seed);
1237 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1240 const struct nft_chain *chain = ptr;
1241 const char *name = arg->key;
1243 return strcmp(chain->name, name);
1246 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1248 const struct nft_object_hash_key *k = data;
1250 seed ^= hash_ptr(k->table, 32);
1252 return jhash(k->name, strlen(k->name), seed);
1255 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1257 const struct nft_object *obj = data;
1259 return nft_objname_hash(&obj->key, 0, seed);
1262 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1265 const struct nft_object_hash_key *k = arg->key;
1266 const struct nft_object *obj = ptr;
1268 if (obj->key.table != k->table)
1271 return strcmp(obj->key.name, k->name);
1274 static bool nft_supported_family(u8 family)
1277 #ifdef CONFIG_NF_TABLES_INET
1278 || family == NFPROTO_INET
1280 #ifdef CONFIG_NF_TABLES_IPV4
1281 || family == NFPROTO_IPV4
1283 #ifdef CONFIG_NF_TABLES_ARP
1284 || family == NFPROTO_ARP
1286 #ifdef CONFIG_NF_TABLES_NETDEV
1287 || family == NFPROTO_NETDEV
1289 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1290 || family == NFPROTO_BRIDGE
1292 #ifdef CONFIG_NF_TABLES_IPV6
1293 || family == NFPROTO_IPV6
1298 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1299 const struct nlattr * const nla[])
1301 struct nftables_pernet *nft_net = nft_pernet(info->net);
1302 struct netlink_ext_ack *extack = info->extack;
1303 u8 genmask = nft_genmask_next(info->net);
1304 u8 family = info->nfmsg->nfgen_family;
1305 struct net *net = info->net;
1306 const struct nlattr *attr;
1307 struct nft_table *table;
1312 if (!nft_supported_family(family))
1315 lockdep_assert_held(&nft_net->commit_mutex);
1316 attr = nla[NFTA_TABLE_NAME];
1317 table = nft_table_lookup(net, attr, family, genmask,
1318 NETLINK_CB(skb).portid);
1319 if (IS_ERR(table)) {
1320 if (PTR_ERR(table) != -ENOENT)
1321 return PTR_ERR(table);
1323 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1324 NL_SET_BAD_ATTR(extack, attr);
1327 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1330 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1332 return nf_tables_updtable(&ctx);
1335 if (nla[NFTA_TABLE_FLAGS]) {
1336 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1337 if (flags & ~NFT_TABLE_F_MASK)
1342 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1346 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1347 if (table->name == NULL)
1350 if (nla[NFTA_TABLE_USERDATA]) {
1351 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1352 if (table->udata == NULL)
1353 goto err_table_udata;
1355 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1358 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1362 INIT_LIST_HEAD(&table->chains);
1363 INIT_LIST_HEAD(&table->sets);
1364 INIT_LIST_HEAD(&table->objects);
1365 INIT_LIST_HEAD(&table->flowtables);
1366 table->family = family;
1367 table->flags = flags;
1368 table->handle = ++nft_net->table_handle;
1369 if (table->flags & NFT_TABLE_F_OWNER)
1370 table->nlpid = NETLINK_CB(skb).portid;
1372 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1373 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1377 list_add_tail_rcu(&table->list, &nft_net->tables);
1380 rhltable_destroy(&table->chains_ht);
1382 kfree(table->udata);
1391 static int nft_flush_table(struct nft_ctx *ctx)
1393 struct nft_flowtable *flowtable, *nft;
1394 struct nft_chain *chain, *nc;
1395 struct nft_object *obj, *ne;
1396 struct nft_set *set, *ns;
1399 list_for_each_entry(chain, &ctx->table->chains, list) {
1400 if (!nft_is_active_next(ctx->net, chain))
1403 if (nft_chain_is_bound(chain))
1408 err = nft_delrule_by_chain(ctx);
1413 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1414 if (!nft_is_active_next(ctx->net, set))
1417 if (nft_set_is_anonymous(set) &&
1418 !list_empty(&set->bindings))
1421 err = nft_delset(ctx, set);
1426 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1427 if (!nft_is_active_next(ctx->net, flowtable))
1430 err = nft_delflowtable(ctx, flowtable);
1435 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1436 if (!nft_is_active_next(ctx->net, obj))
1439 err = nft_delobj(ctx, obj);
1444 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1445 if (!nft_is_active_next(ctx->net, chain))
1448 if (nft_chain_is_bound(chain))
1453 err = nft_delchain(ctx);
1458 err = nft_deltable(ctx);
1463 static int nft_flush(struct nft_ctx *ctx, int family)
1465 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1466 const struct nlattr * const *nla = ctx->nla;
1467 struct nft_table *table, *nt;
1470 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1471 if (family != AF_UNSPEC && table->family != family)
1474 ctx->family = table->family;
1476 if (!nft_is_active_next(ctx->net, table))
1479 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1482 if (nla[NFTA_TABLE_NAME] &&
1483 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1488 err = nft_flush_table(ctx);
1496 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1497 const struct nlattr * const nla[])
1499 struct netlink_ext_ack *extack = info->extack;
1500 u8 genmask = nft_genmask_next(info->net);
1501 u8 family = info->nfmsg->nfgen_family;
1502 struct net *net = info->net;
1503 const struct nlattr *attr;
1504 struct nft_table *table;
1507 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1508 if (family == AF_UNSPEC ||
1509 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1510 return nft_flush(&ctx, family);
1512 if (nla[NFTA_TABLE_HANDLE]) {
1513 attr = nla[NFTA_TABLE_HANDLE];
1514 table = nft_table_lookup_byhandle(net, attr, genmask,
1515 NETLINK_CB(skb).portid);
1517 attr = nla[NFTA_TABLE_NAME];
1518 table = nft_table_lookup(net, attr, family, genmask,
1519 NETLINK_CB(skb).portid);
1522 if (IS_ERR(table)) {
1523 NL_SET_BAD_ATTR(extack, attr);
1524 return PTR_ERR(table);
1527 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1531 ctx.family = family;
1534 return nft_flush_table(&ctx);
1537 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1539 if (WARN_ON(ctx->table->use > 0))
1542 rhltable_destroy(&ctx->table->chains_ht);
1543 kfree(ctx->table->name);
1544 kfree(ctx->table->udata);
1548 void nft_register_chain_type(const struct nft_chain_type *ctype)
1550 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1551 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1552 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1555 chain_type[ctype->family][ctype->type] = ctype;
1556 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1558 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1560 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1562 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1563 chain_type[ctype->family][ctype->type] = NULL;
1564 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1566 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1572 static struct nft_chain *
1573 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1575 struct nft_chain *chain;
1577 list_for_each_entry(chain, &table->chains, list) {
1578 if (chain->handle == handle &&
1579 nft_active_genmask(chain, genmask))
1583 return ERR_PTR(-ENOENT);
1586 static bool lockdep_commit_lock_is_held(const struct net *net)
1588 #ifdef CONFIG_PROVE_LOCKING
1589 struct nftables_pernet *nft_net = nft_pernet(net);
1591 return lockdep_is_held(&nft_net->commit_mutex);
1597 static struct nft_chain *nft_chain_lookup(struct net *net,
1598 struct nft_table *table,
1599 const struct nlattr *nla, u8 genmask)
1601 char search[NFT_CHAIN_MAXNAMELEN + 1];
1602 struct rhlist_head *tmp, *list;
1603 struct nft_chain *chain;
1606 return ERR_PTR(-EINVAL);
1608 nla_strscpy(search, nla, sizeof(search));
1610 WARN_ON(!rcu_read_lock_held() &&
1611 !lockdep_commit_lock_is_held(net));
1613 chain = ERR_PTR(-ENOENT);
1615 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1619 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1620 if (nft_active_genmask(chain, genmask))
1623 chain = ERR_PTR(-ENOENT);
1629 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1630 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1631 .len = NFT_TABLE_MAXNAMELEN - 1 },
1632 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1633 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1634 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1635 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1636 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1637 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1638 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1639 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1640 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1641 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1642 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1643 .len = NFT_USERDATA_MAXLEN },
1646 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1647 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1648 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1649 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1650 .len = IFNAMSIZ - 1 },
1653 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1655 struct nft_stats *cpu_stats, total;
1656 struct nlattr *nest;
1664 memset(&total, 0, sizeof(total));
1665 for_each_possible_cpu(cpu) {
1666 cpu_stats = per_cpu_ptr(stats, cpu);
1668 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1669 pkts = cpu_stats->pkts;
1670 bytes = cpu_stats->bytes;
1671 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1673 total.bytes += bytes;
1675 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1677 goto nla_put_failure;
1679 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1680 NFTA_COUNTER_PAD) ||
1681 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1683 goto nla_put_failure;
1685 nla_nest_end(skb, nest);
1692 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1693 const struct nft_base_chain *basechain)
1695 const struct nf_hook_ops *ops = &basechain->ops;
1696 struct nft_hook *hook, *first = NULL;
1697 struct nlattr *nest, *nest_devs;
1700 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1702 goto nla_put_failure;
1703 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1704 goto nla_put_failure;
1705 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1706 goto nla_put_failure;
1708 if (nft_base_chain_netdev(family, ops->hooknum)) {
1709 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1710 list_for_each_entry(hook, &basechain->hook_list, list) {
1714 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1715 hook->ops.dev->name))
1716 goto nla_put_failure;
1719 nla_nest_end(skb, nest_devs);
1722 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1723 goto nla_put_failure;
1725 nla_nest_end(skb, nest);
1732 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1733 u32 portid, u32 seq, int event, u32 flags,
1734 int family, const struct nft_table *table,
1735 const struct nft_chain *chain)
1737 struct nlmsghdr *nlh;
1739 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1740 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1741 NFNETLINK_V0, nft_base_seq(net));
1743 goto nla_put_failure;
1745 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1746 goto nla_put_failure;
1747 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1749 goto nla_put_failure;
1750 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1751 goto nla_put_failure;
1753 if (nft_is_base_chain(chain)) {
1754 const struct nft_base_chain *basechain = nft_base_chain(chain);
1755 struct nft_stats __percpu *stats;
1757 if (nft_dump_basechain_hook(skb, family, basechain))
1758 goto nla_put_failure;
1760 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1761 htonl(basechain->policy)))
1762 goto nla_put_failure;
1764 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1765 goto nla_put_failure;
1767 stats = rcu_dereference_check(basechain->stats,
1768 lockdep_commit_lock_is_held(net));
1769 if (nft_dump_stats(skb, stats))
1770 goto nla_put_failure;
1774 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1775 goto nla_put_failure;
1777 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1778 goto nla_put_failure;
1781 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1782 goto nla_put_failure;
1784 nlmsg_end(skb, nlh);
1788 nlmsg_trim(skb, nlh);
1792 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1794 struct nftables_pernet *nft_net;
1795 struct sk_buff *skb;
1800 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1803 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1807 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1808 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1810 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1811 event, flags, ctx->family, ctx->table,
1818 nft_net = nft_pernet(ctx->net);
1819 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1822 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1825 static int nf_tables_dump_chains(struct sk_buff *skb,
1826 struct netlink_callback *cb)
1828 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1829 unsigned int idx = 0, s_idx = cb->args[0];
1830 struct net *net = sock_net(skb->sk);
1831 int family = nfmsg->nfgen_family;
1832 struct nftables_pernet *nft_net;
1833 const struct nft_table *table;
1834 const struct nft_chain *chain;
1837 nft_net = nft_pernet(net);
1838 cb->seq = READ_ONCE(nft_net->base_seq);
1840 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1841 if (family != NFPROTO_UNSPEC && family != table->family)
1844 list_for_each_entry_rcu(chain, &table->chains, list) {
1848 memset(&cb->args[1], 0,
1849 sizeof(cb->args) - sizeof(cb->args[0]));
1850 if (!nft_is_active(net, chain))
1852 if (nf_tables_fill_chain_info(skb, net,
1853 NETLINK_CB(cb->skb).portid,
1857 table->family, table,
1861 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1872 /* called with rcu_read_lock held */
1873 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1874 const struct nlattr * const nla[])
1876 struct netlink_ext_ack *extack = info->extack;
1877 u8 genmask = nft_genmask_cur(info->net);
1878 u8 family = info->nfmsg->nfgen_family;
1879 const struct nft_chain *chain;
1880 struct net *net = info->net;
1881 struct nft_table *table;
1882 struct sk_buff *skb2;
1885 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1886 struct netlink_dump_control c = {
1887 .dump = nf_tables_dump_chains,
1888 .module = THIS_MODULE,
1891 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1894 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1895 if (IS_ERR(table)) {
1896 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1897 return PTR_ERR(table);
1900 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1901 if (IS_ERR(chain)) {
1902 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1903 return PTR_ERR(chain);
1906 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1910 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1911 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1912 0, family, table, chain);
1914 goto err_fill_chain_info;
1916 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1918 err_fill_chain_info:
1923 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1924 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1925 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1928 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1930 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1931 struct nft_stats __percpu *newstats;
1932 struct nft_stats *stats;
1935 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1936 nft_counter_policy, NULL);
1938 return ERR_PTR(err);
1940 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1941 return ERR_PTR(-EINVAL);
1943 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1944 if (newstats == NULL)
1945 return ERR_PTR(-ENOMEM);
1947 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1948 * are not exposed to userspace.
1951 stats = this_cpu_ptr(newstats);
1952 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1953 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1959 static void nft_chain_stats_replace(struct nft_trans *trans)
1961 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1963 if (!nft_trans_chain_stats(trans))
1966 nft_trans_chain_stats(trans) =
1967 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1968 lockdep_commit_lock_is_held(trans->ctx.net));
1970 if (!nft_trans_chain_stats(trans))
1971 static_branch_inc(&nft_counters_enabled);
1974 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1976 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1977 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1983 /* should be NULL either via abort or via successful commit */
1984 WARN_ON_ONCE(chain->blob_next);
1985 kvfree(chain->blob_next);
1988 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1990 struct nft_chain *chain = ctx->chain;
1991 struct nft_hook *hook, *next;
1993 if (WARN_ON(chain->use > 0))
1996 /* no concurrent access possible anymore */
1997 nf_tables_chain_free_chain_rules(chain);
1999 if (nft_is_base_chain(chain)) {
2000 struct nft_base_chain *basechain = nft_base_chain(chain);
2002 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
2003 list_for_each_entry_safe(hook, next,
2004 &basechain->hook_list, list) {
2005 list_del_rcu(&hook->list);
2006 kfree_rcu(hook, rcu);
2009 module_put(basechain->type->owner);
2010 if (rcu_access_pointer(basechain->stats)) {
2011 static_branch_dec(&nft_counters_enabled);
2012 free_percpu(rcu_dereference_raw(basechain->stats));
2015 kfree(chain->udata);
2019 kfree(chain->udata);
2024 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
2025 const struct nlattr *attr)
2027 struct net_device *dev;
2028 char ifname[IFNAMSIZ];
2029 struct nft_hook *hook;
2032 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
2035 goto err_hook_alloc;
2038 nla_strscpy(ifname, attr, IFNAMSIZ);
2039 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
2040 * indirectly serializing all the other holders of the commit_mutex with
2043 dev = __dev_get_by_name(net, ifname);
2048 hook->ops.dev = dev;
2055 return ERR_PTR(err);
2058 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
2059 const struct nft_hook *this)
2061 struct nft_hook *hook;
2063 list_for_each_entry(hook, hook_list, list) {
2064 if (this->ops.dev == hook->ops.dev)
2071 static int nf_tables_parse_netdev_hooks(struct net *net,
2072 const struct nlattr *attr,
2073 struct list_head *hook_list)
2075 struct nft_hook *hook, *next;
2076 const struct nlattr *tmp;
2077 int rem, n = 0, err;
2079 nla_for_each_nested(tmp, attr, rem) {
2080 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
2085 hook = nft_netdev_hook_alloc(net, tmp);
2087 err = PTR_ERR(hook);
2090 if (nft_hook_list_find(hook_list, hook)) {
2095 list_add_tail(&hook->list, hook_list);
2098 if (n == NFT_NETDEVICE_MAX) {
2107 list_for_each_entry_safe(hook, next, hook_list, list) {
2108 list_del(&hook->list);
2114 struct nft_chain_hook {
2117 const struct nft_chain_type *type;
2118 struct list_head list;
2121 static int nft_chain_parse_netdev(struct net *net,
2122 struct nlattr *tb[],
2123 struct list_head *hook_list)
2125 struct nft_hook *hook;
2128 if (tb[NFTA_HOOK_DEV]) {
2129 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2131 return PTR_ERR(hook);
2133 list_add_tail(&hook->list, hook_list);
2134 } else if (tb[NFTA_HOOK_DEVS]) {
2135 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2140 if (list_empty(hook_list))
2149 static int nft_chain_parse_hook(struct net *net,
2150 const struct nlattr * const nla[],
2151 struct nft_chain_hook *hook, u8 family,
2152 struct netlink_ext_ack *extack, bool autoload)
2154 struct nftables_pernet *nft_net = nft_pernet(net);
2155 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2156 const struct nft_chain_type *type;
2159 lockdep_assert_held(&nft_net->commit_mutex);
2160 lockdep_nfnl_nft_mutex_not_held();
2162 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2163 nla[NFTA_CHAIN_HOOK],
2164 nft_hook_policy, NULL);
2168 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2169 ha[NFTA_HOOK_PRIORITY] == NULL)
2172 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2173 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2175 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2179 if (nla[NFTA_CHAIN_TYPE]) {
2180 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2183 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2184 return PTR_ERR(type);
2187 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2190 if (type->type == NFT_CHAIN_T_NAT &&
2191 hook->priority <= NF_IP_PRI_CONNTRACK)
2194 if (!try_module_get(type->owner)) {
2195 if (nla[NFTA_CHAIN_TYPE])
2196 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2202 INIT_LIST_HEAD(&hook->list);
2203 if (nft_base_chain_netdev(family, hook->num)) {
2204 err = nft_chain_parse_netdev(net, ha, &hook->list);
2206 module_put(type->owner);
2209 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2210 module_put(type->owner);
2217 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2219 struct nft_hook *h, *next;
2221 list_for_each_entry_safe(h, next, &hook->list, list) {
2225 module_put(hook->type->owner);
2228 struct nft_rules_old {
2230 struct nft_rule_blob *blob;
2233 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2235 struct nft_rule_dp *prule;
2237 prule = (struct nft_rule_dp *)ptr;
2239 /* blob size does not include the trailer rule */
2242 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2244 struct nft_rule_blob *blob;
2246 /* size must include room for the last rule */
2247 if (size < offsetof(struct nft_rule_dp, data))
2250 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2254 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2259 nft_last_rule(blob, blob->data);
2264 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2265 const struct nft_chain_hook *hook,
2266 struct nft_chain *chain)
2269 ops->hooknum = hook->num;
2270 ops->priority = hook->priority;
2272 ops->hook = hook->type->hooks[ops->hooknum];
2273 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2276 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2277 struct nft_chain_hook *hook, u32 flags)
2279 struct nft_chain *chain;
2282 basechain->type = hook->type;
2283 INIT_LIST_HEAD(&basechain->hook_list);
2284 chain = &basechain->chain;
2286 if (nft_base_chain_netdev(family, hook->num)) {
2287 list_splice_init(&hook->list, &basechain->hook_list);
2288 list_for_each_entry(h, &basechain->hook_list, list)
2289 nft_basechain_hook_init(&h->ops, family, hook, chain);
2291 basechain->ops.hooknum = hook->num;
2292 basechain->ops.priority = hook->priority;
2294 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2297 chain->flags |= NFT_CHAIN_BASE | flags;
2298 basechain->policy = NF_ACCEPT;
2299 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2300 !nft_chain_offload_support(basechain)) {
2301 list_splice_init(&basechain->hook_list, &hook->list);
2305 flow_block_init(&basechain->flow_block);
2310 int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2314 err = rhltable_insert_key(&table->chains_ht, chain->name,
2315 &chain->rhlhead, nft_chain_ht_params);
2319 list_add_tail_rcu(&chain->list, &table->chains);
2324 static u64 chain_id;
2326 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2327 u8 policy, u32 flags,
2328 struct netlink_ext_ack *extack)
2330 const struct nlattr * const *nla = ctx->nla;
2331 struct nft_table *table = ctx->table;
2332 struct nft_base_chain *basechain;
2333 struct net *net = ctx->net;
2334 char name[NFT_NAME_MAXLEN];
2335 struct nft_rule_blob *blob;
2336 struct nft_trans *trans;
2337 struct nft_chain *chain;
2338 unsigned int data_size;
2341 if (table->use == UINT_MAX)
2344 if (nla[NFTA_CHAIN_HOOK]) {
2345 struct nft_stats __percpu *stats = NULL;
2346 struct nft_chain_hook hook;
2348 if (flags & NFT_CHAIN_BINDING)
2351 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2356 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2357 if (basechain == NULL) {
2358 nft_chain_release_hook(&hook);
2361 chain = &basechain->chain;
2363 if (nla[NFTA_CHAIN_COUNTERS]) {
2364 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2365 if (IS_ERR(stats)) {
2366 nft_chain_release_hook(&hook);
2368 return PTR_ERR(stats);
2370 rcu_assign_pointer(basechain->stats, stats);
2373 err = nft_basechain_init(basechain, family, &hook, flags);
2375 nft_chain_release_hook(&hook);
2381 static_branch_inc(&nft_counters_enabled);
2383 if (flags & NFT_CHAIN_BASE)
2385 if (flags & NFT_CHAIN_HW_OFFLOAD)
2388 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2392 chain->flags = flags;
2396 INIT_LIST_HEAD(&chain->rules);
2397 chain->handle = nf_tables_alloc_handle(table);
2398 chain->table = table;
2400 if (nla[NFTA_CHAIN_NAME]) {
2401 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2403 if (!(flags & NFT_CHAIN_BINDING)) {
2405 goto err_destroy_chain;
2408 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2409 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2414 goto err_destroy_chain;
2417 if (nla[NFTA_CHAIN_USERDATA]) {
2418 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2419 if (chain->udata == NULL) {
2421 goto err_destroy_chain;
2423 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2426 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2427 blob = nf_tables_chain_alloc_rules(data_size);
2430 goto err_destroy_chain;
2433 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2434 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2436 err = nf_tables_register_hook(net, table, chain);
2438 goto err_destroy_chain;
2440 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2441 if (IS_ERR(trans)) {
2442 err = PTR_ERR(trans);
2443 goto err_unregister_hook;
2446 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2447 if (nft_is_base_chain(chain))
2448 nft_trans_chain_policy(trans) = policy;
2450 err = nft_chain_add(table, chain);
2452 nft_trans_destroy(trans);
2453 goto err_unregister_hook;
2459 err_unregister_hook:
2460 nf_tables_unregister_hook(net, table, chain);
2462 nf_tables_chain_destroy(ctx);
2467 static bool nft_hook_list_equal(struct list_head *hook_list1,
2468 struct list_head *hook_list2)
2470 struct nft_hook *hook;
2474 list_for_each_entry(hook, hook_list2, list) {
2475 if (!nft_hook_list_find(hook_list1, hook))
2480 list_for_each_entry(hook, hook_list1, list)
2486 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2487 u32 flags, const struct nlattr *attr,
2488 struct netlink_ext_ack *extack)
2490 const struct nlattr * const *nla = ctx->nla;
2491 struct nft_table *table = ctx->table;
2492 struct nft_chain *chain = ctx->chain;
2493 struct nft_base_chain *basechain;
2494 struct nft_stats *stats = NULL;
2495 struct nft_chain_hook hook;
2496 struct nf_hook_ops *ops;
2497 struct nft_trans *trans;
2500 if (chain->flags ^ flags)
2503 if (nla[NFTA_CHAIN_HOOK]) {
2504 if (!nft_is_base_chain(chain)) {
2505 NL_SET_BAD_ATTR(extack, attr);
2508 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2513 basechain = nft_base_chain(chain);
2514 if (basechain->type != hook.type) {
2515 nft_chain_release_hook(&hook);
2516 NL_SET_BAD_ATTR(extack, attr);
2520 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2521 if (!nft_hook_list_equal(&basechain->hook_list,
2523 nft_chain_release_hook(&hook);
2524 NL_SET_BAD_ATTR(extack, attr);
2528 ops = &basechain->ops;
2529 if (ops->hooknum != hook.num ||
2530 ops->priority != hook.priority) {
2531 nft_chain_release_hook(&hook);
2532 NL_SET_BAD_ATTR(extack, attr);
2536 nft_chain_release_hook(&hook);
2539 if (nla[NFTA_CHAIN_HANDLE] &&
2540 nla[NFTA_CHAIN_NAME]) {
2541 struct nft_chain *chain2;
2543 chain2 = nft_chain_lookup(ctx->net, table,
2544 nla[NFTA_CHAIN_NAME], genmask);
2545 if (!IS_ERR(chain2)) {
2546 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2551 if (nla[NFTA_CHAIN_COUNTERS]) {
2552 if (!nft_is_base_chain(chain))
2555 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2557 return PTR_ERR(stats);
2561 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2562 sizeof(struct nft_trans_chain));
2566 nft_trans_chain_stats(trans) = stats;
2567 nft_trans_chain_update(trans) = true;
2569 if (nla[NFTA_CHAIN_POLICY])
2570 nft_trans_chain_policy(trans) = policy;
2572 nft_trans_chain_policy(trans) = -1;
2574 if (nla[NFTA_CHAIN_HANDLE] &&
2575 nla[NFTA_CHAIN_NAME]) {
2576 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2577 struct nft_trans *tmp;
2581 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2586 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2587 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2588 tmp->ctx.table == table &&
2589 nft_trans_chain_update(tmp) &&
2590 nft_trans_chain_name(tmp) &&
2591 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2592 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2598 nft_trans_chain_name(trans) = name;
2600 nft_trans_commit_list_add_tail(ctx->net, trans);
2609 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2610 const struct nft_table *table,
2611 const struct nlattr *nla)
2613 struct nftables_pernet *nft_net = nft_pernet(net);
2614 u32 id = ntohl(nla_get_be32(nla));
2615 struct nft_trans *trans;
2617 list_for_each_entry(trans, &nft_net->commit_list, list) {
2618 struct nft_chain *chain = trans->ctx.chain;
2620 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2621 chain->table == table &&
2622 id == nft_trans_chain_id(trans))
2625 return ERR_PTR(-ENOENT);
2628 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2629 const struct nlattr * const nla[])
2631 struct nftables_pernet *nft_net = nft_pernet(info->net);
2632 struct netlink_ext_ack *extack = info->extack;
2633 u8 genmask = nft_genmask_next(info->net);
2634 u8 family = info->nfmsg->nfgen_family;
2635 struct nft_chain *chain = NULL;
2636 struct net *net = info->net;
2637 const struct nlattr *attr;
2638 struct nft_table *table;
2639 u8 policy = NF_ACCEPT;
2644 lockdep_assert_held(&nft_net->commit_mutex);
2646 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2647 NETLINK_CB(skb).portid);
2648 if (IS_ERR(table)) {
2649 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2650 return PTR_ERR(table);
2654 attr = nla[NFTA_CHAIN_NAME];
2656 if (nla[NFTA_CHAIN_HANDLE]) {
2657 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2658 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2659 if (IS_ERR(chain)) {
2660 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2661 return PTR_ERR(chain);
2663 attr = nla[NFTA_CHAIN_HANDLE];
2664 } else if (nla[NFTA_CHAIN_NAME]) {
2665 chain = nft_chain_lookup(net, table, attr, genmask);
2666 if (IS_ERR(chain)) {
2667 if (PTR_ERR(chain) != -ENOENT) {
2668 NL_SET_BAD_ATTR(extack, attr);
2669 return PTR_ERR(chain);
2673 } else if (!nla[NFTA_CHAIN_ID]) {
2677 if (nla[NFTA_CHAIN_POLICY]) {
2678 if (chain != NULL &&
2679 !nft_is_base_chain(chain)) {
2680 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2684 if (chain == NULL &&
2685 nla[NFTA_CHAIN_HOOK] == NULL) {
2686 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2690 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2700 if (nla[NFTA_CHAIN_FLAGS])
2701 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2703 flags = chain->flags;
2705 if (flags & ~NFT_CHAIN_FLAGS)
2708 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2710 if (chain != NULL) {
2711 if (chain->flags & NFT_CHAIN_BINDING)
2714 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2715 NL_SET_BAD_ATTR(extack, attr);
2718 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2721 flags |= chain->flags & NFT_CHAIN_BASE;
2722 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2726 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2729 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2730 const struct nlattr * const nla[])
2732 struct netlink_ext_ack *extack = info->extack;
2733 u8 genmask = nft_genmask_next(info->net);
2734 u8 family = info->nfmsg->nfgen_family;
2735 struct net *net = info->net;
2736 const struct nlattr *attr;
2737 struct nft_table *table;
2738 struct nft_chain *chain;
2739 struct nft_rule *rule;
2745 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2746 NETLINK_CB(skb).portid);
2747 if (IS_ERR(table)) {
2748 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2749 return PTR_ERR(table);
2752 if (nla[NFTA_CHAIN_HANDLE]) {
2753 attr = nla[NFTA_CHAIN_HANDLE];
2754 handle = be64_to_cpu(nla_get_be64(attr));
2755 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2757 attr = nla[NFTA_CHAIN_NAME];
2758 chain = nft_chain_lookup(net, table, attr, genmask);
2760 if (IS_ERR(chain)) {
2761 NL_SET_BAD_ATTR(extack, attr);
2762 return PTR_ERR(chain);
2765 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2769 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2772 list_for_each_entry(rule, &chain->rules, list) {
2773 if (!nft_is_active_next(net, rule))
2777 err = nft_delrule(&ctx, rule);
2782 /* There are rules and elements that are still holding references to us,
2783 * we cannot do a recursive removal in this case.
2786 NL_SET_BAD_ATTR(extack, attr);
2790 return nft_delchain(&ctx);
2798 * nft_register_expr - register nf_tables expr type
2801 * Registers the expr type for use with nf_tables. Returns zero on
2802 * success or a negative errno code otherwise.
2804 int nft_register_expr(struct nft_expr_type *type)
2806 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2807 if (type->family == NFPROTO_UNSPEC)
2808 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2810 list_add_rcu(&type->list, &nf_tables_expressions);
2811 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2814 EXPORT_SYMBOL_GPL(nft_register_expr);
2817 * nft_unregister_expr - unregister nf_tables expr type
2820 * Unregisters the expr typefor use with nf_tables.
2822 void nft_unregister_expr(struct nft_expr_type *type)
2824 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2825 list_del_rcu(&type->list);
2826 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2828 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2830 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2833 const struct nft_expr_type *type, *candidate = NULL;
2835 list_for_each_entry(type, &nf_tables_expressions, list) {
2836 if (!nla_strcmp(nla, type->name)) {
2837 if (!type->family && !candidate)
2839 else if (type->family == family)
2846 #ifdef CONFIG_MODULES
2847 static int nft_expr_type_request_module(struct net *net, u8 family,
2850 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2851 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2858 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2862 const struct nft_expr_type *type;
2865 return ERR_PTR(-EINVAL);
2867 type = __nft_expr_type_get(family, nla);
2868 if (type != NULL && try_module_get(type->owner))
2871 lockdep_nfnl_nft_mutex_not_held();
2872 #ifdef CONFIG_MODULES
2874 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2875 return ERR_PTR(-EAGAIN);
2877 if (nft_request_module(net, "nft-expr-%.*s",
2879 (char *)nla_data(nla)) == -EAGAIN)
2880 return ERR_PTR(-EAGAIN);
2883 return ERR_PTR(-ENOENT);
2886 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2887 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2888 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2889 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2892 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2893 const struct nft_expr *expr)
2895 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2896 goto nla_put_failure;
2898 if (expr->ops->dump) {
2899 struct nlattr *data = nla_nest_start_noflag(skb,
2902 goto nla_put_failure;
2903 if (expr->ops->dump(skb, expr) < 0)
2904 goto nla_put_failure;
2905 nla_nest_end(skb, data);
2914 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2915 const struct nft_expr *expr)
2917 struct nlattr *nest;
2919 nest = nla_nest_start_noflag(skb, attr);
2921 goto nla_put_failure;
2922 if (nf_tables_fill_expr_info(skb, expr) < 0)
2923 goto nla_put_failure;
2924 nla_nest_end(skb, nest);
2931 struct nft_expr_info {
2932 const struct nft_expr_ops *ops;
2933 const struct nlattr *attr;
2934 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2937 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2938 const struct nlattr *nla,
2939 struct nft_expr_info *info)
2941 const struct nft_expr_type *type;
2942 const struct nft_expr_ops *ops;
2943 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2946 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2947 nft_expr_policy, NULL);
2951 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2953 return PTR_ERR(type);
2955 if (tb[NFTA_EXPR_DATA]) {
2956 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2958 type->policy, NULL);
2962 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2964 if (type->select_ops != NULL) {
2965 ops = type->select_ops(ctx,
2966 (const struct nlattr * const *)info->tb);
2969 #ifdef CONFIG_MODULES
2971 if (nft_expr_type_request_module(ctx->net,
2973 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2987 module_put(type->owner);
2991 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2992 const struct nft_expr_info *expr_info,
2993 struct nft_expr *expr)
2995 const struct nft_expr_ops *ops = expr_info->ops;
3000 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
3011 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
3012 struct nft_expr *expr)
3014 const struct nft_expr_type *type = expr->ops->type;
3016 if (expr->ops->destroy)
3017 expr->ops->destroy(ctx, expr);
3018 module_put(type->owner);
3021 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
3022 const struct nlattr *nla)
3024 struct nft_expr_info expr_info;
3025 struct nft_expr *expr;
3026 struct module *owner;
3029 err = nf_tables_expr_parse(ctx, nla, &expr_info);
3031 goto err_expr_parse;
3034 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
3035 goto err_expr_stateful;
3038 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
3040 goto err_expr_stateful;
3042 err = nf_tables_newexpr(ctx, &expr_info, expr);
3050 owner = expr_info.ops->type->owner;
3051 if (expr_info.ops->type->release_ops)
3052 expr_info.ops->type->release_ops(expr_info.ops);
3056 return ERR_PTR(err);
3059 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
3063 if (src->ops->clone) {
3064 dst->ops = src->ops;
3065 err = src->ops->clone(dst, src);
3069 memcpy(dst, src, src->ops->size);
3072 __module_get(src->ops->type->owner);
3077 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
3079 nf_tables_expr_destroy(ctx, expr);
3087 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
3090 struct nft_rule *rule;
3092 // FIXME: this sucks
3093 list_for_each_entry_rcu(rule, &chain->rules, list) {
3094 if (handle == rule->handle)
3098 return ERR_PTR(-ENOENT);
3101 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
3102 const struct nlattr *nla)
3105 return ERR_PTR(-EINVAL);
3107 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
3110 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
3111 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
3112 .len = NFT_TABLE_MAXNAMELEN - 1 },
3113 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
3114 .len = NFT_CHAIN_MAXNAMELEN - 1 },
3115 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
3116 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
3117 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
3118 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
3119 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
3120 .len = NFT_USERDATA_MAXLEN },
3121 [NFTA_RULE_ID] = { .type = NLA_U32 },
3122 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
3123 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
3126 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
3127 u32 portid, u32 seq, int event,
3128 u32 flags, int family,
3129 const struct nft_table *table,
3130 const struct nft_chain *chain,
3131 const struct nft_rule *rule, u64 handle)
3133 struct nlmsghdr *nlh;
3134 const struct nft_expr *expr, *next;
3135 struct nlattr *list;
3136 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3138 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3141 goto nla_put_failure;
3143 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3144 goto nla_put_failure;
3145 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3146 goto nla_put_failure;
3147 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3149 goto nla_put_failure;
3151 if (event != NFT_MSG_DELRULE && handle) {
3152 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3154 goto nla_put_failure;
3157 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3158 nft_flow_rule_stats(chain, rule);
3160 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3162 goto nla_put_failure;
3163 nft_rule_for_each_expr(expr, next, rule) {
3164 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3165 goto nla_put_failure;
3167 nla_nest_end(skb, list);
3170 struct nft_userdata *udata = nft_userdata(rule);
3171 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3173 goto nla_put_failure;
3176 nlmsg_end(skb, nlh);
3180 nlmsg_trim(skb, nlh);
3184 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3185 const struct nft_rule *rule, int event)
3187 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3188 const struct nft_rule *prule;
3189 struct sk_buff *skb;
3195 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3198 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3202 if (event == NFT_MSG_NEWRULE &&
3203 !list_is_first(&rule->list, &ctx->chain->rules) &&
3204 !list_is_last(&rule->list, &ctx->chain->rules)) {
3205 prule = list_prev_entry(rule, list);
3206 handle = prule->handle;
3208 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3209 flags |= NLM_F_APPEND;
3210 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3211 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3213 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3214 event, flags, ctx->family, ctx->table,
3215 ctx->chain, rule, handle);
3221 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3224 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3227 struct nft_rule_dump_ctx {
3232 static int __nf_tables_dump_rules(struct sk_buff *skb,
3234 struct netlink_callback *cb,
3235 const struct nft_table *table,
3236 const struct nft_chain *chain)
3238 struct net *net = sock_net(skb->sk);
3239 const struct nft_rule *rule, *prule;
3240 unsigned int s_idx = cb->args[0];
3244 list_for_each_entry_rcu(rule, &chain->rules, list) {
3245 if (!nft_is_active(net, rule))
3250 memset(&cb->args[1], 0,
3251 sizeof(cb->args) - sizeof(cb->args[0]));
3254 handle = prule->handle;
3258 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3261 NLM_F_MULTI | NLM_F_APPEND,
3263 table, chain, rule, handle) < 0)
3266 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3275 static int nf_tables_dump_rules(struct sk_buff *skb,
3276 struct netlink_callback *cb)
3278 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3279 const struct nft_rule_dump_ctx *ctx = cb->data;
3280 struct nft_table *table;
3281 const struct nft_chain *chain;
3282 unsigned int idx = 0;
3283 struct net *net = sock_net(skb->sk);
3284 int family = nfmsg->nfgen_family;
3285 struct nftables_pernet *nft_net;
3288 nft_net = nft_pernet(net);
3289 cb->seq = READ_ONCE(nft_net->base_seq);
3291 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3292 if (family != NFPROTO_UNSPEC && family != table->family)
3295 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3298 if (ctx && ctx->table && ctx->chain) {
3299 struct rhlist_head *list, *tmp;
3301 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3302 nft_chain_ht_params);
3306 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3307 if (!nft_is_active(net, chain))
3309 __nf_tables_dump_rules(skb, &idx,
3316 list_for_each_entry_rcu(chain, &table->chains, list) {
3317 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3321 if (ctx && ctx->table)
3331 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3333 const struct nlattr * const *nla = cb->data;
3334 struct nft_rule_dump_ctx *ctx = NULL;
3336 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3337 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3341 if (nla[NFTA_RULE_TABLE]) {
3342 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3349 if (nla[NFTA_RULE_CHAIN]) {
3350 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3364 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3366 struct nft_rule_dump_ctx *ctx = cb->data;
3376 /* called with rcu_read_lock held */
3377 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3378 const struct nlattr * const nla[])
3380 struct netlink_ext_ack *extack = info->extack;
3381 u8 genmask = nft_genmask_cur(info->net);
3382 u8 family = info->nfmsg->nfgen_family;
3383 const struct nft_chain *chain;
3384 const struct nft_rule *rule;
3385 struct net *net = info->net;
3386 struct nft_table *table;
3387 struct sk_buff *skb2;
3390 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3391 struct netlink_dump_control c = {
3392 .start= nf_tables_dump_rules_start,
3393 .dump = nf_tables_dump_rules,
3394 .done = nf_tables_dump_rules_done,
3395 .module = THIS_MODULE,
3396 .data = (void *)nla,
3399 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3402 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3403 if (IS_ERR(table)) {
3404 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3405 return PTR_ERR(table);
3408 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3409 if (IS_ERR(chain)) {
3410 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3411 return PTR_ERR(chain);
3414 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3416 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3417 return PTR_ERR(rule);
3420 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3424 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3425 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3426 family, table, chain, rule, 0);
3428 goto err_fill_rule_info;
3430 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3437 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule)
3439 struct nft_expr *expr, *next;
3442 * Careful: some expressions might not be initialized in case this
3443 * is called on error from nf_tables_newrule().
3445 expr = nft_expr_first(rule);
3446 while (nft_expr_more(rule, expr)) {
3447 next = nft_expr_next(expr);
3448 nf_tables_expr_destroy(ctx, expr);
3454 static void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3456 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3457 nf_tables_rule_destroy(ctx, rule);
3460 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3462 struct nft_expr *expr, *last;
3463 const struct nft_data *data;
3464 struct nft_rule *rule;
3467 if (ctx->level == NFT_JUMP_STACK_SIZE)
3470 list_for_each_entry(rule, &chain->rules, list) {
3471 if (!nft_is_active_next(ctx->net, rule))
3474 nft_rule_for_each_expr(expr, last, rule) {
3475 if (!expr->ops->validate)
3478 err = expr->ops->validate(ctx, expr, &data);
3488 EXPORT_SYMBOL_GPL(nft_chain_validate);
3490 static int nft_table_validate(struct net *net, const struct nft_table *table)
3492 struct nft_chain *chain;
3493 struct nft_ctx ctx = {
3495 .family = table->family,
3499 list_for_each_entry(chain, &table->chains, list) {
3500 if (!nft_is_base_chain(chain))
3504 err = nft_chain_validate(&ctx, chain);
3512 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
3513 const struct nft_set_iter *iter,
3514 struct nft_set_elem *elem)
3516 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
3517 struct nft_ctx *pctx = (struct nft_ctx *)ctx;
3518 const struct nft_data *data;
3521 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
3522 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
3525 data = nft_set_ext_data(ext);
3526 switch (data->verdict.code) {
3530 err = nft_chain_validate(ctx, data->verdict.chain);
3542 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set)
3544 u8 genmask = nft_genmask_next(ctx->net);
3545 struct nft_set_elem_catchall *catchall;
3546 struct nft_set_elem elem;
3547 struct nft_set_ext *ext;
3550 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
3551 ext = nft_set_elem_ext(set, catchall->elem);
3552 if (!nft_set_elem_active(ext, genmask))
3555 elem.priv = catchall->elem;
3556 ret = nft_setelem_validate(ctx, set, NULL, &elem);
3564 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3565 const struct nft_chain *chain,
3566 const struct nlattr *nla);
3568 #define NFT_RULE_MAXEXPRS 128
3570 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3571 const struct nlattr * const nla[])
3573 struct nftables_pernet *nft_net = nft_pernet(info->net);
3574 struct netlink_ext_ack *extack = info->extack;
3575 unsigned int size, i, n, ulen = 0, usize = 0;
3576 u8 genmask = nft_genmask_next(info->net);
3577 struct nft_rule *rule, *old_rule = NULL;
3578 struct nft_expr_info *expr_info = NULL;
3579 u8 family = info->nfmsg->nfgen_family;
3580 struct nft_flow_rule *flow = NULL;
3581 struct net *net = info->net;
3582 struct nft_userdata *udata;
3583 struct nft_table *table;
3584 struct nft_chain *chain;
3585 struct nft_trans *trans;
3586 u64 handle, pos_handle;
3587 struct nft_expr *expr;
3592 lockdep_assert_held(&nft_net->commit_mutex);
3594 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3595 NETLINK_CB(skb).portid);
3596 if (IS_ERR(table)) {
3597 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3598 return PTR_ERR(table);
3601 if (nla[NFTA_RULE_CHAIN]) {
3602 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3604 if (IS_ERR(chain)) {
3605 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3606 return PTR_ERR(chain);
3608 if (nft_chain_is_bound(chain))
3611 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3612 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3613 if (IS_ERR(chain)) {
3614 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3615 return PTR_ERR(chain);
3621 if (nla[NFTA_RULE_HANDLE]) {
3622 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3623 rule = __nft_rule_lookup(chain, handle);
3625 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3626 return PTR_ERR(rule);
3629 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3630 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3633 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3638 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3639 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3641 handle = nf_tables_alloc_handle(table);
3643 if (chain->use == UINT_MAX)
3646 if (nla[NFTA_RULE_POSITION]) {
3647 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3648 old_rule = __nft_rule_lookup(chain, pos_handle);
3649 if (IS_ERR(old_rule)) {
3650 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3651 return PTR_ERR(old_rule);
3653 } else if (nla[NFTA_RULE_POSITION_ID]) {
3654 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3655 if (IS_ERR(old_rule)) {
3656 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3657 return PTR_ERR(old_rule);
3662 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3666 if (nla[NFTA_RULE_EXPRESSIONS]) {
3667 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3668 sizeof(struct nft_expr_info),
3673 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3675 if (nla_type(tmp) != NFTA_LIST_ELEM)
3676 goto err_release_expr;
3677 if (n == NFT_RULE_MAXEXPRS)
3678 goto err_release_expr;
3679 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3681 NL_SET_BAD_ATTR(extack, tmp);
3682 goto err_release_expr;
3684 size += expr_info[n].ops->size;
3688 /* Check for overflow of dlen field */
3690 if (size >= 1 << 12)
3691 goto err_release_expr;
3693 if (nla[NFTA_RULE_USERDATA]) {
3694 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3696 usize = sizeof(struct nft_userdata) + ulen;
3700 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3702 goto err_release_expr;
3704 nft_activate_next(net, rule);
3706 rule->handle = handle;
3708 rule->udata = ulen ? 1 : 0;
3711 udata = nft_userdata(rule);
3712 udata->len = ulen - 1;
3713 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3716 expr = nft_expr_first(rule);
3717 for (i = 0; i < n; i++) {
3718 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3720 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3721 goto err_release_rule;
3724 if (expr_info[i].ops->validate)
3725 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3727 expr_info[i].ops = NULL;
3728 expr = nft_expr_next(expr);
3731 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3732 flow = nft_flow_rule_create(net, rule);
3734 err = PTR_ERR(flow);
3735 goto err_release_rule;
3739 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3740 err = nft_delrule(&ctx, old_rule);
3742 goto err_destroy_flow_rule;
3744 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3745 if (trans == NULL) {
3747 goto err_destroy_flow_rule;
3749 list_add_tail_rcu(&rule->list, &old_rule->list);
3751 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3754 goto err_destroy_flow_rule;
3757 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3759 list_add_rcu(&rule->list, &old_rule->list);
3761 list_add_tail_rcu(&rule->list, &chain->rules);
3764 list_add_tail_rcu(&rule->list, &old_rule->list);
3766 list_add_rcu(&rule->list, &chain->rules);
3773 nft_trans_flow_rule(trans) = flow;
3775 if (nft_net->validate_state == NFT_VALIDATE_DO)
3776 return nft_table_validate(net, table);
3780 err_destroy_flow_rule:
3782 nft_flow_rule_destroy(flow);
3784 nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE_ERROR);
3785 nf_tables_rule_destroy(&ctx, rule);
3787 for (i = 0; i < n; i++) {
3788 if (expr_info[i].ops) {
3789 module_put(expr_info[i].ops->type->owner);
3790 if (expr_info[i].ops->type->release_ops)
3791 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3799 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3800 const struct nft_chain *chain,
3801 const struct nlattr *nla)
3803 struct nftables_pernet *nft_net = nft_pernet(net);
3804 u32 id = ntohl(nla_get_be32(nla));
3805 struct nft_trans *trans;
3807 list_for_each_entry(trans, &nft_net->commit_list, list) {
3808 if (trans->msg_type == NFT_MSG_NEWRULE &&
3809 trans->ctx.chain == chain &&
3810 id == nft_trans_rule_id(trans))
3811 return nft_trans_rule(trans);
3813 return ERR_PTR(-ENOENT);
3816 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3817 const struct nlattr * const nla[])
3819 struct netlink_ext_ack *extack = info->extack;
3820 u8 genmask = nft_genmask_next(info->net);
3821 u8 family = info->nfmsg->nfgen_family;
3822 struct nft_chain *chain = NULL;
3823 struct net *net = info->net;
3824 struct nft_table *table;
3825 struct nft_rule *rule;
3829 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3830 NETLINK_CB(skb).portid);
3831 if (IS_ERR(table)) {
3832 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3833 return PTR_ERR(table);
3836 if (nla[NFTA_RULE_CHAIN]) {
3837 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3839 if (IS_ERR(chain)) {
3840 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3841 return PTR_ERR(chain);
3843 if (nft_chain_is_bound(chain))
3847 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3850 if (nla[NFTA_RULE_HANDLE]) {
3851 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3853 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3854 return PTR_ERR(rule);
3857 err = nft_delrule(&ctx, rule);
3858 } else if (nla[NFTA_RULE_ID]) {
3859 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3861 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3862 return PTR_ERR(rule);
3865 err = nft_delrule(&ctx, rule);
3867 err = nft_delrule_by_chain(&ctx);
3870 list_for_each_entry(chain, &table->chains, list) {
3871 if (!nft_is_active_next(net, chain))
3875 err = nft_delrule_by_chain(&ctx);
3887 static const struct nft_set_type *nft_set_types[] = {
3888 &nft_set_hash_fast_type,
3890 &nft_set_rhash_type,
3891 &nft_set_bitmap_type,
3892 &nft_set_rbtree_type,
3893 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3894 &nft_set_pipapo_avx2_type,
3896 &nft_set_pipapo_type,
3899 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3900 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3903 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3905 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3909 * Select a set implementation based on the data characteristics and the
3910 * given policy. The total memory use might not be known if no size is
3911 * given, in that case the amount of memory per element is used.
3913 static const struct nft_set_ops *
3914 nft_select_set_ops(const struct nft_ctx *ctx,
3915 const struct nlattr * const nla[],
3916 const struct nft_set_desc *desc)
3918 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3919 const struct nft_set_ops *ops, *bops;
3920 struct nft_set_estimate est, best;
3921 const struct nft_set_type *type;
3925 lockdep_assert_held(&nft_net->commit_mutex);
3926 lockdep_nfnl_nft_mutex_not_held();
3928 if (nla[NFTA_SET_FLAGS] != NULL)
3929 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3936 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3937 type = nft_set_types[i];
3940 if (!nft_set_ops_candidate(type, flags))
3942 if (!ops->estimate(desc, flags, &est))
3945 switch (desc->policy) {
3946 case NFT_SET_POL_PERFORMANCE:
3947 if (est.lookup < best.lookup)
3949 if (est.lookup == best.lookup &&
3950 est.space < best.space)
3953 case NFT_SET_POL_MEMORY:
3955 if (est.space < best.space)
3957 if (est.space == best.space &&
3958 est.lookup < best.lookup)
3960 } else if (est.size < best.size || !bops) {
3975 return ERR_PTR(-EOPNOTSUPP);
3978 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3979 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3980 .len = NFT_TABLE_MAXNAMELEN - 1 },
3981 [NFTA_SET_NAME] = { .type = NLA_STRING,
3982 .len = NFT_SET_MAXNAMELEN - 1 },
3983 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3984 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3985 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3986 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3987 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3988 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3989 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3990 [NFTA_SET_ID] = { .type = NLA_U32 },
3991 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3992 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3993 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3994 .len = NFT_USERDATA_MAXLEN },
3995 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3996 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3997 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3998 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
4001 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
4002 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
4003 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
4006 static struct nft_set *nft_set_lookup(const struct nft_table *table,
4007 const struct nlattr *nla, u8 genmask)
4009 struct nft_set *set;
4012 return ERR_PTR(-EINVAL);
4014 list_for_each_entry_rcu(set, &table->sets, list) {
4015 if (!nla_strcmp(nla, set->name) &&
4016 nft_active_genmask(set, genmask))
4019 return ERR_PTR(-ENOENT);
4022 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
4023 const struct nlattr *nla,
4026 struct nft_set *set;
4028 list_for_each_entry(set, &table->sets, list) {
4029 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
4030 nft_active_genmask(set, genmask))
4033 return ERR_PTR(-ENOENT);
4036 static struct nft_set *nft_set_lookup_byid(const struct net *net,
4037 const struct nft_table *table,
4038 const struct nlattr *nla, u8 genmask)
4040 struct nftables_pernet *nft_net = nft_pernet(net);
4041 u32 id = ntohl(nla_get_be32(nla));
4042 struct nft_trans *trans;
4044 list_for_each_entry(trans, &nft_net->commit_list, list) {
4045 if (trans->msg_type == NFT_MSG_NEWSET) {
4046 struct nft_set *set = nft_trans_set(trans);
4048 if (id == nft_trans_set_id(trans) &&
4049 set->table == table &&
4050 nft_active_genmask(set, genmask))
4054 return ERR_PTR(-ENOENT);
4057 struct nft_set *nft_set_lookup_global(const struct net *net,
4058 const struct nft_table *table,
4059 const struct nlattr *nla_set_name,
4060 const struct nlattr *nla_set_id,
4063 struct nft_set *set;
4065 set = nft_set_lookup(table, nla_set_name, genmask);
4070 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
4074 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
4076 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
4079 const struct nft_set *i;
4081 unsigned long *inuse;
4082 unsigned int n = 0, min = 0;
4084 p = strchr(name, '%');
4086 if (p[1] != 'd' || strchr(p + 2, '%'))
4089 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
4093 list_for_each_entry(i, &ctx->table->sets, list) {
4096 if (!nft_is_active_next(ctx->net, i))
4098 if (!sscanf(i->name, name, &tmp))
4100 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
4103 set_bit(tmp - min, inuse);
4106 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
4107 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
4108 min += BITS_PER_BYTE * PAGE_SIZE;
4109 memset(inuse, 0, PAGE_SIZE);
4112 free_page((unsigned long)inuse);
4115 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
4119 list_for_each_entry(i, &ctx->table->sets, list) {
4120 if (!nft_is_active_next(ctx->net, i))
4122 if (!strcmp(set->name, i->name)) {
4131 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
4133 u64 ms = be64_to_cpu(nla_get_be64(nla));
4134 u64 max = (u64)(~((u64)0));
4136 max = div_u64(max, NSEC_PER_MSEC);
4140 ms *= NSEC_PER_MSEC;
4141 *result = nsecs_to_jiffies64(ms);
4145 __be64 nf_jiffies64_to_msecs(u64 input)
4147 return cpu_to_be64(jiffies64_to_msecs(input));
4150 static int nf_tables_fill_set_concat(struct sk_buff *skb,
4151 const struct nft_set *set)
4153 struct nlattr *concat, *field;
4156 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
4160 for (i = 0; i < set->field_count; i++) {
4161 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4165 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
4166 htonl(set->field_len[i])))
4169 nla_nest_end(skb, field);
4172 nla_nest_end(skb, concat);
4177 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
4178 const struct nft_set *set, u16 event, u16 flags)
4180 u64 timeout = READ_ONCE(set->timeout);
4181 u32 gc_int = READ_ONCE(set->gc_int);
4182 u32 portid = ctx->portid;
4183 struct nlmsghdr *nlh;
4184 struct nlattr *nest;
4188 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4189 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4190 NFNETLINK_V0, nft_base_seq(ctx->net));
4192 goto nla_put_failure;
4194 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4195 goto nla_put_failure;
4196 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4197 goto nla_put_failure;
4198 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4200 goto nla_put_failure;
4201 if (set->flags != 0)
4202 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4203 goto nla_put_failure;
4205 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4206 goto nla_put_failure;
4207 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4208 goto nla_put_failure;
4209 if (set->flags & NFT_SET_MAP) {
4210 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4211 goto nla_put_failure;
4212 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4213 goto nla_put_failure;
4215 if (set->flags & NFT_SET_OBJECT &&
4216 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4217 goto nla_put_failure;
4220 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4221 nf_jiffies64_to_msecs(timeout),
4223 goto nla_put_failure;
4225 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(gc_int)))
4226 goto nla_put_failure;
4228 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4229 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4230 goto nla_put_failure;
4234 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4235 goto nla_put_failure;
4237 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4239 goto nla_put_failure;
4241 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4242 goto nla_put_failure;
4244 if (set->field_count > 1 &&
4245 nf_tables_fill_set_concat(skb, set))
4246 goto nla_put_failure;
4248 nla_nest_end(skb, nest);
4250 if (set->num_exprs == 1) {
4251 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4252 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4253 goto nla_put_failure;
4255 nla_nest_end(skb, nest);
4256 } else if (set->num_exprs > 1) {
4257 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4259 goto nla_put_failure;
4261 for (i = 0; i < set->num_exprs; i++) {
4262 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4264 goto nla_put_failure;
4266 nla_nest_end(skb, nest);
4269 nlmsg_end(skb, nlh);
4273 nlmsg_trim(skb, nlh);
4277 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4278 const struct nft_set *set, int event,
4281 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4282 u32 portid = ctx->portid;
4283 struct sk_buff *skb;
4288 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4291 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4295 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4296 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4298 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4304 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4307 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4310 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4312 const struct nft_set *set;
4313 unsigned int idx, s_idx = cb->args[0];
4314 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4315 struct net *net = sock_net(skb->sk);
4316 struct nft_ctx *ctx = cb->data, ctx_set;
4317 struct nftables_pernet *nft_net;
4323 nft_net = nft_pernet(net);
4324 cb->seq = READ_ONCE(nft_net->base_seq);
4326 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4327 if (ctx->family != NFPROTO_UNSPEC &&
4328 ctx->family != table->family)
4331 if (ctx->table && ctx->table != table)
4335 if (cur_table != table)
4341 list_for_each_entry_rcu(set, &table->sets, list) {
4344 if (!nft_is_active(net, set))
4348 ctx_set.table = table;
4349 ctx_set.family = table->family;
4351 if (nf_tables_fill_set(skb, &ctx_set, set,
4355 cb->args[2] = (unsigned long) table;
4358 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4371 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4373 struct nft_ctx *ctx_dump = NULL;
4375 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4376 if (ctx_dump == NULL)
4379 cb->data = ctx_dump;
4383 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4389 /* called with rcu_read_lock held */
4390 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4391 const struct nlattr * const nla[])
4393 struct netlink_ext_ack *extack = info->extack;
4394 u8 genmask = nft_genmask_cur(info->net);
4395 u8 family = info->nfmsg->nfgen_family;
4396 struct nft_table *table = NULL;
4397 struct net *net = info->net;
4398 const struct nft_set *set;
4399 struct sk_buff *skb2;
4403 if (nla[NFTA_SET_TABLE]) {
4404 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4406 if (IS_ERR(table)) {
4407 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4408 return PTR_ERR(table);
4412 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4414 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4415 struct netlink_dump_control c = {
4416 .start = nf_tables_dump_sets_start,
4417 .dump = nf_tables_dump_sets,
4418 .done = nf_tables_dump_sets_done,
4420 .module = THIS_MODULE,
4423 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4426 /* Only accept unspec with dump */
4427 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4428 return -EAFNOSUPPORT;
4429 if (!nla[NFTA_SET_TABLE])
4432 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4434 return PTR_ERR(set);
4436 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4440 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4442 goto err_fill_set_info;
4444 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4451 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4452 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4455 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4456 struct nft_set_desc *desc)
4458 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4462 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4465 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4466 nft_concat_policy, NULL);
4470 if (!tb[NFTA_SET_FIELD_LEN])
4473 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4474 if (!len || len > U8_MAX)
4477 desc->field_len[desc->field_count++] = len;
4482 static int nft_set_desc_concat(struct nft_set_desc *desc,
4483 const struct nlattr *nla)
4485 struct nlattr *attr;
4489 nla_for_each_nested(attr, nla, rem) {
4490 if (nla_type(attr) != NFTA_LIST_ELEM)
4493 err = nft_set_desc_concat_parse(attr, desc);
4498 for (i = 0; i < desc->field_count; i++)
4499 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4501 if (num_regs > NFT_REG32_COUNT)
4507 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4508 const struct nlattr *nla)
4510 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4513 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4514 nft_set_desc_policy, NULL);
4518 if (da[NFTA_SET_DESC_SIZE] != NULL)
4519 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4520 if (da[NFTA_SET_DESC_CONCAT])
4521 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4526 static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set,
4527 const struct nlattr * const *nla,
4528 struct nft_expr **exprs, int *num_exprs,
4531 struct nft_expr *expr;
4534 if (nla[NFTA_SET_EXPR]) {
4535 expr = nft_set_elem_expr_alloc(ctx, set, nla[NFTA_SET_EXPR]);
4537 err = PTR_ERR(expr);
4538 goto err_set_expr_alloc;
4542 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4546 if (!(flags & NFT_SET_EXPR)) {
4548 goto err_set_expr_alloc;
4551 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4552 if (i == NFT_SET_EXPR_MAX) {
4554 goto err_set_expr_alloc;
4556 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4558 goto err_set_expr_alloc;
4560 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
4562 err = PTR_ERR(expr);
4563 goto err_set_expr_alloc;
4573 for (i = 0; i < *num_exprs; i++)
4574 nft_expr_destroy(ctx, exprs[i]);
4579 static bool nft_set_is_same(const struct nft_set *set,
4580 const struct nft_set_desc *desc,
4581 struct nft_expr *exprs[], u32 num_exprs, u32 flags)
4585 if (set->ktype != desc->ktype ||
4586 set->dtype != desc->dtype ||
4587 set->flags != flags ||
4588 set->klen != desc->klen ||
4589 set->dlen != desc->dlen ||
4590 set->field_count != desc->field_count ||
4591 set->num_exprs != num_exprs)
4594 for (i = 0; i < desc->field_count; i++) {
4595 if (set->field_len[i] != desc->field_len[i])
4599 for (i = 0; i < num_exprs; i++) {
4600 if (set->exprs[i]->ops != exprs[i]->ops)
4607 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4608 const struct nlattr * const nla[])
4610 struct netlink_ext_ack *extack = info->extack;
4611 u8 genmask = nft_genmask_next(info->net);
4612 u8 family = info->nfmsg->nfgen_family;
4613 const struct nft_set_ops *ops;
4614 struct net *net = info->net;
4615 struct nft_set_desc desc;
4616 struct nft_table *table;
4617 unsigned char *udata;
4618 struct nft_set *set;
4628 if (nla[NFTA_SET_TABLE] == NULL ||
4629 nla[NFTA_SET_NAME] == NULL ||
4630 nla[NFTA_SET_KEY_LEN] == NULL ||
4631 nla[NFTA_SET_ID] == NULL)
4634 memset(&desc, 0, sizeof(desc));
4636 desc.ktype = NFT_DATA_VALUE;
4637 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4638 desc.ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4639 if ((desc.ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4643 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4644 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4648 if (nla[NFTA_SET_FLAGS] != NULL) {
4649 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4650 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4651 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4652 NFT_SET_MAP | NFT_SET_EVAL |
4653 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4655 /* Only one of these operations is supported */
4656 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4657 (NFT_SET_MAP | NFT_SET_OBJECT))
4659 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4660 (NFT_SET_EVAL | NFT_SET_OBJECT))
4665 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4666 if (!(flags & NFT_SET_MAP))
4669 desc.dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4670 if ((desc.dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4671 desc.dtype != NFT_DATA_VERDICT)
4674 if (desc.dtype != NFT_DATA_VERDICT) {
4675 if (nla[NFTA_SET_DATA_LEN] == NULL)
4677 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4678 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4681 desc.dlen = sizeof(struct nft_verdict);
4682 } else if (flags & NFT_SET_MAP)
4685 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4686 if (!(flags & NFT_SET_OBJECT))
4689 desc.objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4690 if (desc.objtype == NFT_OBJECT_UNSPEC ||
4691 desc.objtype > NFT_OBJECT_MAX)
4693 } else if (flags & NFT_SET_OBJECT)
4696 desc.objtype = NFT_OBJECT_UNSPEC;
4699 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4700 if (!(flags & NFT_SET_TIMEOUT))
4703 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &desc.timeout);
4708 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4709 if (!(flags & NFT_SET_TIMEOUT))
4711 desc.gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4714 desc.policy = NFT_SET_POL_PERFORMANCE;
4715 if (nla[NFTA_SET_POLICY] != NULL)
4716 desc.policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4718 if (nla[NFTA_SET_DESC] != NULL) {
4719 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4723 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4725 } else if (flags & NFT_SET_CONCAT) {
4729 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4732 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4733 NETLINK_CB(skb).portid);
4734 if (IS_ERR(table)) {
4735 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4736 return PTR_ERR(table);
4739 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4741 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4743 if (PTR_ERR(set) != -ENOENT) {
4744 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4745 return PTR_ERR(set);
4748 struct nft_expr *exprs[NFT_SET_EXPR_MAX] = {};
4750 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4751 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4754 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4757 err = nft_set_expr_alloc(&ctx, set, nla, exprs, &num_exprs, flags);
4762 if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) {
4763 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4767 for (i = 0; i < num_exprs; i++)
4768 nft_expr_destroy(&ctx, exprs[i]);
4773 return __nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set, &desc);
4776 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4779 ops = nft_select_set_ops(&ctx, nla, &desc);
4781 return PTR_ERR(ops);
4784 if (nla[NFTA_SET_USERDATA])
4785 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4788 if (ops->privsize != NULL)
4789 size = ops->privsize(nla, &desc);
4790 alloc_size = sizeof(*set) + size + udlen;
4791 if (alloc_size < size || alloc_size > INT_MAX)
4793 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4797 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4803 err = nf_tables_set_alloc_name(&ctx, set, name);
4810 udata = set->data + size;
4811 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4814 INIT_LIST_HEAD(&set->bindings);
4815 INIT_LIST_HEAD(&set->catchall_list);
4817 write_pnet(&set->net, net);
4819 set->ktype = desc.ktype;
4820 set->klen = desc.klen;
4821 set->dtype = desc.dtype;
4822 set->objtype = desc.objtype;
4823 set->dlen = desc.dlen;
4825 set->size = desc.size;
4826 set->policy = desc.policy;
4829 set->timeout = desc.timeout;
4830 set->gc_int = desc.gc_int;
4832 set->field_count = desc.field_count;
4833 for (i = 0; i < desc.field_count; i++)
4834 set->field_len[i] = desc.field_len[i];
4836 err = ops->init(set, &desc, nla);
4840 err = nft_set_expr_alloc(&ctx, set, nla, set->exprs, &num_exprs, flags);
4842 goto err_set_destroy;
4844 set->num_exprs = num_exprs;
4845 set->handle = nf_tables_alloc_handle(table);
4846 INIT_LIST_HEAD(&set->pending_update);
4848 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4850 goto err_set_expr_alloc;
4852 list_add_tail_rcu(&set->list, &table->sets);
4857 for (i = 0; i < set->num_exprs; i++)
4858 nft_expr_destroy(&ctx, set->exprs[i]);
4860 ops->destroy(&ctx, set);
4868 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4869 struct nft_set *set)
4871 struct nft_set_elem_catchall *next, *catchall;
4873 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4874 list_del_rcu(&catchall->list);
4875 nf_tables_set_elem_destroy(ctx, set, catchall->elem);
4876 kfree_rcu(catchall, rcu);
4880 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4884 if (WARN_ON(set->use > 0))
4887 for (i = 0; i < set->num_exprs; i++)
4888 nft_expr_destroy(ctx, set->exprs[i]);
4890 set->ops->destroy(ctx, set);
4891 nft_set_catchall_destroy(ctx, set);
4896 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4897 const struct nlattr * const nla[])
4899 struct netlink_ext_ack *extack = info->extack;
4900 u8 genmask = nft_genmask_next(info->net);
4901 u8 family = info->nfmsg->nfgen_family;
4902 struct net *net = info->net;
4903 const struct nlattr *attr;
4904 struct nft_table *table;
4905 struct nft_set *set;
4908 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4909 return -EAFNOSUPPORT;
4911 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4912 genmask, NETLINK_CB(skb).portid);
4913 if (IS_ERR(table)) {
4914 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4915 return PTR_ERR(table);
4918 if (nla[NFTA_SET_HANDLE]) {
4919 attr = nla[NFTA_SET_HANDLE];
4920 set = nft_set_lookup_byhandle(table, attr, genmask);
4922 attr = nla[NFTA_SET_NAME];
4923 set = nft_set_lookup(table, attr, genmask);
4927 NL_SET_BAD_ATTR(extack, attr);
4928 return PTR_ERR(set);
4931 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4932 atomic_read(&set->nelems) > 0)) {
4933 NL_SET_BAD_ATTR(extack, attr);
4937 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4939 return nft_delset(&ctx, set);
4942 static int nft_validate_register_store(const struct nft_ctx *ctx,
4943 enum nft_registers reg,
4944 const struct nft_data *data,
4945 enum nft_data_types type,
4948 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4949 struct nft_set *set,
4950 struct nft_set_elem *elem)
4952 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4953 enum nft_registers dreg;
4955 dreg = nft_type_to_reg(set->dtype);
4956 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4957 set->dtype == NFT_DATA_VERDICT ?
4958 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4962 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4963 struct nft_set *set,
4964 const struct nft_set_iter *iter,
4965 struct nft_set_elem *elem)
4967 return nft_setelem_data_validate(ctx, set, elem);
4970 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4971 struct nft_set *set)
4973 u8 genmask = nft_genmask_next(ctx->net);
4974 struct nft_set_elem_catchall *catchall;
4975 struct nft_set_elem elem;
4976 struct nft_set_ext *ext;
4979 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4980 ext = nft_set_elem_ext(set, catchall->elem);
4981 if (!nft_set_elem_active(ext, genmask))
4984 elem.priv = catchall->elem;
4985 ret = nft_setelem_data_validate(ctx, set, &elem);
4993 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4994 struct nft_set_binding *binding)
4996 struct nft_set_binding *i;
4997 struct nft_set_iter iter;
4999 if (set->use == UINT_MAX)
5002 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
5005 if (binding->flags & NFT_SET_MAP) {
5006 /* If the set is already bound to the same chain all
5007 * jumps are already validated for that chain.
5009 list_for_each_entry(i, &set->bindings, list) {
5010 if (i->flags & NFT_SET_MAP &&
5011 i->chain == binding->chain)
5015 iter.genmask = nft_genmask_next(ctx->net);
5019 iter.fn = nf_tables_bind_check_setelem;
5021 set->ops->walk(ctx, set, &iter);
5023 iter.err = nft_set_catchall_bind_check(ctx, set);
5029 binding->chain = ctx->chain;
5030 list_add_tail_rcu(&binding->list, &set->bindings);
5031 nft_set_trans_bind(ctx, set);
5036 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
5038 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
5039 struct nft_set_binding *binding, bool event)
5041 list_del_rcu(&binding->list);
5043 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
5044 list_del_rcu(&set->list);
5046 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
5051 static void nft_setelem_data_activate(const struct net *net,
5052 const struct nft_set *set,
5053 struct nft_set_elem *elem);
5055 static int nft_mapelem_activate(const struct nft_ctx *ctx,
5056 struct nft_set *set,
5057 const struct nft_set_iter *iter,
5058 struct nft_set_elem *elem)
5060 nft_setelem_data_activate(ctx->net, set, elem);
5065 static void nft_map_catchall_activate(const struct nft_ctx *ctx,
5066 struct nft_set *set)
5068 u8 genmask = nft_genmask_next(ctx->net);
5069 struct nft_set_elem_catchall *catchall;
5070 struct nft_set_elem elem;
5071 struct nft_set_ext *ext;
5073 list_for_each_entry(catchall, &set->catchall_list, list) {
5074 ext = nft_set_elem_ext(set, catchall->elem);
5075 if (!nft_set_elem_active(ext, genmask))
5078 elem.priv = catchall->elem;
5079 nft_setelem_data_activate(ctx->net, set, &elem);
5084 static void nft_map_activate(const struct nft_ctx *ctx, struct nft_set *set)
5086 struct nft_set_iter iter = {
5087 .genmask = nft_genmask_next(ctx->net),
5088 .fn = nft_mapelem_activate,
5091 set->ops->walk(ctx, set, &iter);
5092 WARN_ON_ONCE(iter.err);
5094 nft_map_catchall_activate(ctx, set);
5097 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
5099 if (nft_set_is_anonymous(set)) {
5100 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5101 nft_map_activate(ctx, set);
5103 nft_clear(ctx->net, set);
5108 EXPORT_SYMBOL_GPL(nf_tables_activate_set);
5110 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
5111 struct nft_set_binding *binding,
5112 enum nft_trans_phase phase)
5115 case NFT_TRANS_PREPARE_ERROR:
5116 nft_set_trans_unbind(ctx, set);
5117 if (nft_set_is_anonymous(set))
5118 nft_deactivate_next(ctx->net, set);
5122 case NFT_TRANS_PREPARE:
5123 if (nft_set_is_anonymous(set)) {
5124 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5125 nft_map_deactivate(ctx, set);
5127 nft_deactivate_next(ctx->net, set);
5131 case NFT_TRANS_ABORT:
5132 case NFT_TRANS_RELEASE:
5133 if (nft_set_is_anonymous(set) &&
5134 set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
5135 nft_map_deactivate(ctx, set);
5140 nf_tables_unbind_set(ctx, set, binding,
5141 phase == NFT_TRANS_COMMIT);
5144 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
5146 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
5148 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
5149 nft_set_destroy(ctx, set);
5151 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
5153 const struct nft_set_ext_type nft_set_ext_types[] = {
5154 [NFT_SET_EXT_KEY] = {
5155 .align = __alignof__(u32),
5157 [NFT_SET_EXT_DATA] = {
5158 .align = __alignof__(u32),
5160 [NFT_SET_EXT_EXPRESSIONS] = {
5161 .align = __alignof__(struct nft_set_elem_expr),
5163 [NFT_SET_EXT_OBJREF] = {
5164 .len = sizeof(struct nft_object *),
5165 .align = __alignof__(struct nft_object *),
5167 [NFT_SET_EXT_FLAGS] = {
5169 .align = __alignof__(u8),
5171 [NFT_SET_EXT_TIMEOUT] = {
5173 .align = __alignof__(u64),
5175 [NFT_SET_EXT_EXPIRATION] = {
5177 .align = __alignof__(u64),
5179 [NFT_SET_EXT_USERDATA] = {
5180 .len = sizeof(struct nft_userdata),
5181 .align = __alignof__(struct nft_userdata),
5183 [NFT_SET_EXT_KEY_END] = {
5184 .align = __alignof__(u32),
5192 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
5193 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
5194 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
5195 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
5196 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
5197 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
5198 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
5199 .len = NFT_USERDATA_MAXLEN },
5200 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
5201 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
5202 .len = NFT_OBJ_MAXNAMELEN - 1 },
5203 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
5204 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
5207 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
5208 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
5209 .len = NFT_TABLE_MAXNAMELEN - 1 },
5210 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
5211 .len = NFT_SET_MAXNAMELEN - 1 },
5212 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
5213 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
5216 static int nft_set_elem_expr_dump(struct sk_buff *skb,
5217 const struct nft_set *set,
5218 const struct nft_set_ext *ext)
5220 struct nft_set_elem_expr *elem_expr;
5221 u32 size, num_exprs = 0;
5222 struct nft_expr *expr;
5223 struct nlattr *nest;
5225 elem_expr = nft_set_ext_expr(ext);
5226 nft_setelem_expr_foreach(expr, elem_expr, size)
5229 if (num_exprs == 1) {
5230 expr = nft_setelem_expr_at(elem_expr, 0);
5231 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
5235 } else if (num_exprs > 1) {
5236 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
5238 goto nla_put_failure;
5240 nft_setelem_expr_foreach(expr, elem_expr, size) {
5241 expr = nft_setelem_expr_at(elem_expr, size);
5242 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
5243 goto nla_put_failure;
5245 nla_nest_end(skb, nest);
5253 static int nf_tables_fill_setelem(struct sk_buff *skb,
5254 const struct nft_set *set,
5255 const struct nft_set_elem *elem)
5257 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5258 unsigned char *b = skb_tail_pointer(skb);
5259 struct nlattr *nest;
5261 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
5263 goto nla_put_failure;
5265 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5266 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
5267 NFT_DATA_VALUE, set->klen) < 0)
5268 goto nla_put_failure;
5270 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5271 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
5272 NFT_DATA_VALUE, set->klen) < 0)
5273 goto nla_put_failure;
5275 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5276 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
5277 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
5279 goto nla_put_failure;
5281 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
5282 nft_set_elem_expr_dump(skb, set, ext))
5283 goto nla_put_failure;
5285 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
5286 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
5287 (*nft_set_ext_obj(ext))->key.name) < 0)
5288 goto nla_put_failure;
5290 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5291 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
5292 htonl(*nft_set_ext_flags(ext))))
5293 goto nla_put_failure;
5295 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
5296 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
5297 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
5299 goto nla_put_failure;
5301 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5302 u64 expires, now = get_jiffies_64();
5304 expires = *nft_set_ext_expiration(ext);
5305 if (time_before64(now, expires))
5310 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
5311 nf_jiffies64_to_msecs(expires),
5313 goto nla_put_failure;
5316 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
5317 struct nft_userdata *udata;
5319 udata = nft_set_ext_userdata(ext);
5320 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5321 udata->len + 1, udata->data))
5322 goto nla_put_failure;
5325 nla_nest_end(skb, nest);
5333 struct nft_set_dump_args {
5334 const struct netlink_callback *cb;
5335 struct nft_set_iter iter;
5336 struct sk_buff *skb;
5339 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5340 struct nft_set *set,
5341 const struct nft_set_iter *iter,
5342 struct nft_set_elem *elem)
5344 struct nft_set_dump_args *args;
5346 args = container_of(iter, struct nft_set_dump_args, iter);
5347 return nf_tables_fill_setelem(args->skb, set, elem);
5350 struct nft_set_dump_ctx {
5351 const struct nft_set *set;
5355 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5356 const struct nft_set *set)
5358 struct nft_set_elem_catchall *catchall;
5359 u8 genmask = nft_genmask_cur(net);
5360 struct nft_set_elem elem;
5361 struct nft_set_ext *ext;
5364 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5365 ext = nft_set_elem_ext(set, catchall->elem);
5366 if (!nft_set_elem_active(ext, genmask) ||
5367 nft_set_elem_expired(ext))
5370 elem.priv = catchall->elem;
5371 ret = nf_tables_fill_setelem(skb, set, &elem);
5378 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5380 struct nft_set_dump_ctx *dump_ctx = cb->data;
5381 struct net *net = sock_net(skb->sk);
5382 struct nftables_pernet *nft_net;
5383 struct nft_table *table;
5384 struct nft_set *set;
5385 struct nft_set_dump_args args;
5386 bool set_found = false;
5387 struct nlmsghdr *nlh;
5388 struct nlattr *nest;
5393 nft_net = nft_pernet(net);
5394 cb->seq = READ_ONCE(nft_net->base_seq);
5396 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5397 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5398 dump_ctx->ctx.family != table->family)
5401 if (table != dump_ctx->ctx.table)
5404 list_for_each_entry_rcu(set, &table->sets, list) {
5405 if (set == dump_ctx->set) {
5418 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5419 portid = NETLINK_CB(cb->skb).portid;
5420 seq = cb->nlh->nlmsg_seq;
5422 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5423 table->family, NFNETLINK_V0, nft_base_seq(net));
5425 goto nla_put_failure;
5427 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5428 goto nla_put_failure;
5429 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5430 goto nla_put_failure;
5432 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5434 goto nla_put_failure;
5438 args.iter.genmask = nft_genmask_cur(net);
5439 args.iter.skip = cb->args[0];
5440 args.iter.count = 0;
5442 args.iter.fn = nf_tables_dump_setelem;
5443 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5445 if (!args.iter.err && args.iter.count == cb->args[0])
5446 args.iter.err = nft_set_catchall_dump(net, skb, set);
5449 nla_nest_end(skb, nest);
5450 nlmsg_end(skb, nlh);
5452 if (args.iter.err && args.iter.err != -EMSGSIZE)
5453 return args.iter.err;
5454 if (args.iter.count == cb->args[0])
5457 cb->args[0] = args.iter.count;
5465 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5467 struct nft_set_dump_ctx *dump_ctx = cb->data;
5469 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5471 return cb->data ? 0 : -ENOMEM;
5474 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5480 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5481 const struct nft_ctx *ctx, u32 seq,
5482 u32 portid, int event, u16 flags,
5483 const struct nft_set *set,
5484 const struct nft_set_elem *elem)
5486 struct nlmsghdr *nlh;
5487 struct nlattr *nest;
5490 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5491 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5492 NFNETLINK_V0, nft_base_seq(ctx->net));
5494 goto nla_put_failure;
5496 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5497 goto nla_put_failure;
5498 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5499 goto nla_put_failure;
5501 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5503 goto nla_put_failure;
5505 err = nf_tables_fill_setelem(skb, set, elem);
5507 goto nla_put_failure;
5509 nla_nest_end(skb, nest);
5511 nlmsg_end(skb, nlh);
5515 nlmsg_trim(skb, nlh);
5519 static int nft_setelem_parse_flags(const struct nft_set *set,
5520 const struct nlattr *attr, u32 *flags)
5525 *flags = ntohl(nla_get_be32(attr));
5526 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5528 if (!(set->flags & NFT_SET_INTERVAL) &&
5529 *flags & NFT_SET_ELEM_INTERVAL_END)
5531 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5532 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5538 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5539 struct nft_data *key, struct nlattr *attr)
5541 struct nft_data_desc desc = {
5542 .type = NFT_DATA_VALUE,
5543 .size = NFT_DATA_VALUE_MAXLEN,
5547 return nft_data_init(ctx, key, &desc, attr);
5550 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5551 struct nft_data_desc *desc,
5552 struct nft_data *data,
5553 struct nlattr *attr)
5557 if (set->dtype == NFT_DATA_VERDICT)
5558 dtype = NFT_DATA_VERDICT;
5560 dtype = NFT_DATA_VALUE;
5563 desc->size = NFT_DATA_VALUE_MAXLEN;
5564 desc->len = set->dlen;
5565 desc->flags = NFT_DATA_DESC_SETELEM;
5567 return nft_data_init(ctx, data, desc, attr);
5570 static void *nft_setelem_catchall_get(const struct net *net,
5571 const struct nft_set *set)
5573 struct nft_set_elem_catchall *catchall;
5574 u8 genmask = nft_genmask_cur(net);
5575 struct nft_set_ext *ext;
5578 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5579 ext = nft_set_elem_ext(set, catchall->elem);
5580 if (!nft_set_elem_active(ext, genmask) ||
5581 nft_set_elem_expired(ext))
5584 priv = catchall->elem;
5591 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5592 struct nft_set_elem *elem, u32 flags)
5596 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5597 priv = set->ops->get(ctx->net, set, elem, flags);
5599 return PTR_ERR(priv);
5601 priv = nft_setelem_catchall_get(ctx->net, set);
5610 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5611 const struct nlattr *attr)
5613 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5614 struct nft_set_elem elem;
5615 struct sk_buff *skb;
5619 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5620 nft_set_elem_policy, NULL);
5624 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5628 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5631 if (nla[NFTA_SET_ELEM_KEY]) {
5632 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5633 nla[NFTA_SET_ELEM_KEY]);
5638 if (nla[NFTA_SET_ELEM_KEY_END]) {
5639 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5640 nla[NFTA_SET_ELEM_KEY_END]);
5645 err = nft_setelem_get(ctx, set, &elem, flags);
5650 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5654 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5655 NFT_MSG_NEWSETELEM, 0, set, &elem);
5657 goto err_fill_setelem;
5659 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5666 /* called with rcu_read_lock held */
5667 static int nf_tables_getsetelem(struct sk_buff *skb,
5668 const struct nfnl_info *info,
5669 const struct nlattr * const nla[])
5671 struct netlink_ext_ack *extack = info->extack;
5672 u8 genmask = nft_genmask_cur(info->net);
5673 u8 family = info->nfmsg->nfgen_family;
5674 struct net *net = info->net;
5675 struct nft_table *table;
5676 struct nft_set *set;
5677 struct nlattr *attr;
5681 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5683 if (IS_ERR(table)) {
5684 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5685 return PTR_ERR(table);
5688 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5690 return PTR_ERR(set);
5692 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5694 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5695 struct netlink_dump_control c = {
5696 .start = nf_tables_dump_set_start,
5697 .dump = nf_tables_dump_set,
5698 .done = nf_tables_dump_set_done,
5699 .module = THIS_MODULE,
5701 struct nft_set_dump_ctx dump_ctx = {
5707 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5710 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5713 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5714 err = nft_get_set_elem(&ctx, set, attr);
5716 NL_SET_BAD_ATTR(extack, attr);
5724 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5725 const struct nft_set *set,
5726 const struct nft_set_elem *elem,
5729 struct nftables_pernet *nft_net;
5730 struct net *net = ctx->net;
5731 u32 portid = ctx->portid;
5732 struct sk_buff *skb;
5736 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5739 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5743 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5744 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5746 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5753 nft_net = nft_pernet(net);
5754 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5757 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5760 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5762 struct nft_set *set)
5764 struct nft_trans *trans;
5766 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5770 nft_trans_elem_set(trans) = set;
5774 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5775 const struct nft_set *set,
5776 const struct nlattr *attr)
5778 struct nft_expr *expr;
5781 expr = nft_expr_init(ctx, attr);
5786 if (expr->ops->type->flags & NFT_EXPR_GC) {
5787 if (set->flags & NFT_SET_TIMEOUT)
5788 goto err_set_elem_expr;
5789 if (!set->ops->gc_init)
5790 goto err_set_elem_expr;
5791 set->ops->gc_init(set);
5797 nft_expr_destroy(ctx, expr);
5798 return ERR_PTR(err);
5801 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5803 len += nft_set_ext_types[id].len;
5804 if (len > tmpl->ext_len[id] ||
5811 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5812 void *to, const void *from, u32 len)
5814 if (nft_set_ext_check(tmpl, id, len) < 0)
5817 memcpy(to, from, len);
5822 void *nft_set_elem_init(const struct nft_set *set,
5823 const struct nft_set_ext_tmpl *tmpl,
5824 const u32 *key, const u32 *key_end,
5825 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5827 struct nft_set_ext *ext;
5830 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5832 return ERR_PTR(-ENOMEM);
5834 ext = nft_set_elem_ext(set, elem);
5835 nft_set_ext_init(ext, tmpl);
5837 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5838 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5839 nft_set_ext_key(ext), key, set->klen) < 0)
5842 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5843 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5844 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5847 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5848 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5849 nft_set_ext_data(ext), data, set->dlen) < 0)
5852 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5853 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5854 if (expiration == 0)
5855 *nft_set_ext_expiration(ext) += timeout;
5857 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5858 *nft_set_ext_timeout(ext) = timeout;
5865 return ERR_PTR(-EINVAL);
5868 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5869 struct nft_expr *expr)
5871 if (expr->ops->destroy_clone) {
5872 expr->ops->destroy_clone(ctx, expr);
5873 module_put(expr->ops->type->owner);
5875 nf_tables_expr_destroy(ctx, expr);
5879 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5880 struct nft_set_elem_expr *elem_expr)
5882 struct nft_expr *expr;
5885 nft_setelem_expr_foreach(expr, elem_expr, size)
5886 __nft_set_elem_expr_destroy(ctx, expr);
5889 /* Drop references and destroy. Called from gc, dynset and abort path. */
5890 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5893 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5894 struct nft_ctx ctx = {
5895 .net = read_pnet(&set->net),
5896 .family = set->table->family,
5899 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5900 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5901 nft_data_release(nft_set_ext_data(ext), set->dtype);
5902 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5903 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5905 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5906 (*nft_set_ext_obj(ext))->use--;
5909 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5911 /* Destroy element. References have been already dropped in the preparation
5912 * path via nft_setelem_data_deactivate().
5914 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5915 const struct nft_set *set, void *elem)
5917 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5919 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5920 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5925 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5926 struct nft_expr *expr_array[])
5928 struct nft_expr *expr;
5931 for (i = 0; i < set->num_exprs; i++) {
5932 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5936 err = nft_expr_clone(expr, set->exprs[i]);
5941 expr_array[i] = expr;
5947 for (k = i - 1; k >= 0; k--)
5948 nft_expr_destroy(ctx, expr_array[k]);
5953 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5954 const struct nft_set_ext_tmpl *tmpl,
5955 const struct nft_set_ext *ext,
5956 struct nft_expr *expr_array[],
5959 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5960 u32 len = sizeof(struct nft_set_elem_expr);
5961 struct nft_expr *expr;
5967 for (i = 0; i < num_exprs; i++)
5968 len += expr_array[i]->ops->size;
5970 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5973 for (i = 0; i < num_exprs; i++) {
5974 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5975 err = nft_expr_clone(expr, expr_array[i]);
5977 goto err_elem_expr_setup;
5979 elem_expr->size += expr_array[i]->ops->size;
5980 nft_expr_destroy(ctx, expr_array[i]);
5981 expr_array[i] = NULL;
5986 err_elem_expr_setup:
5987 for (; i < num_exprs; i++) {
5988 nft_expr_destroy(ctx, expr_array[i]);
5989 expr_array[i] = NULL;
5995 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5996 const struct nft_set *set)
5998 struct nft_set_elem_catchall *catchall;
5999 u8 genmask = nft_genmask_cur(net);
6000 struct nft_set_ext *ext;
6002 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6003 ext = nft_set_elem_ext(set, catchall->elem);
6004 if (nft_set_elem_active(ext, genmask) &&
6005 !nft_set_elem_expired(ext))
6011 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
6013 void *nft_set_catchall_gc(const struct nft_set *set)
6015 struct nft_set_elem_catchall *catchall, *next;
6016 struct nft_set_ext *ext;
6019 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6020 ext = nft_set_elem_ext(set, catchall->elem);
6022 if (!nft_set_elem_expired(ext) ||
6023 nft_set_elem_mark_busy(ext))
6026 elem = catchall->elem;
6027 list_del_rcu(&catchall->list);
6028 kfree_rcu(catchall, rcu);
6034 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
6036 static int nft_setelem_catchall_insert(const struct net *net,
6037 struct nft_set *set,
6038 const struct nft_set_elem *elem,
6039 struct nft_set_ext **pext)
6041 struct nft_set_elem_catchall *catchall;
6042 u8 genmask = nft_genmask_next(net);
6043 struct nft_set_ext *ext;
6045 list_for_each_entry(catchall, &set->catchall_list, list) {
6046 ext = nft_set_elem_ext(set, catchall->elem);
6047 if (nft_set_elem_active(ext, genmask)) {
6053 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
6057 catchall->elem = elem->priv;
6058 list_add_tail_rcu(&catchall->list, &set->catchall_list);
6063 static int nft_setelem_insert(const struct net *net,
6064 struct nft_set *set,
6065 const struct nft_set_elem *elem,
6066 struct nft_set_ext **ext, unsigned int flags)
6070 if (flags & NFT_SET_ELEM_CATCHALL)
6071 ret = nft_setelem_catchall_insert(net, set, elem, ext);
6073 ret = set->ops->insert(net, set, elem, ext);
6078 static bool nft_setelem_is_catchall(const struct nft_set *set,
6079 const struct nft_set_elem *elem)
6081 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6083 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
6084 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
6090 static void nft_setelem_activate(struct net *net, struct nft_set *set,
6091 struct nft_set_elem *elem)
6093 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6095 if (nft_setelem_is_catchall(set, elem)) {
6096 nft_set_elem_change_active(net, set, ext);
6097 nft_set_elem_clear_busy(ext);
6099 set->ops->activate(net, set, elem);
6103 static int nft_setelem_catchall_deactivate(const struct net *net,
6104 struct nft_set *set,
6105 struct nft_set_elem *elem)
6107 struct nft_set_elem_catchall *catchall;
6108 struct nft_set_ext *ext;
6110 list_for_each_entry(catchall, &set->catchall_list, list) {
6111 ext = nft_set_elem_ext(set, catchall->elem);
6112 if (!nft_is_active(net, ext) ||
6113 nft_set_elem_mark_busy(ext))
6117 elem->priv = catchall->elem;
6118 nft_set_elem_change_active(net, set, ext);
6125 static int __nft_setelem_deactivate(const struct net *net,
6126 struct nft_set *set,
6127 struct nft_set_elem *elem)
6131 priv = set->ops->deactivate(net, set, elem);
6142 static int nft_setelem_deactivate(const struct net *net,
6143 struct nft_set *set,
6144 struct nft_set_elem *elem, u32 flags)
6148 if (flags & NFT_SET_ELEM_CATCHALL)
6149 ret = nft_setelem_catchall_deactivate(net, set, elem);
6151 ret = __nft_setelem_deactivate(net, set, elem);
6156 static void nft_setelem_catchall_remove(const struct net *net,
6157 const struct nft_set *set,
6158 const struct nft_set_elem *elem)
6160 struct nft_set_elem_catchall *catchall, *next;
6162 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
6163 if (catchall->elem == elem->priv) {
6164 list_del_rcu(&catchall->list);
6165 kfree_rcu(catchall, rcu);
6171 static void nft_setelem_remove(const struct net *net,
6172 const struct nft_set *set,
6173 const struct nft_set_elem *elem)
6175 if (nft_setelem_is_catchall(set, elem))
6176 nft_setelem_catchall_remove(net, set, elem);
6178 set->ops->remove(net, set, elem);
6181 static bool nft_setelem_valid_key_end(const struct nft_set *set,
6182 struct nlattr **nla, u32 flags)
6184 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
6185 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
6186 if (flags & NFT_SET_ELEM_INTERVAL_END)
6189 if (nla[NFTA_SET_ELEM_KEY_END] &&
6190 flags & NFT_SET_ELEM_CATCHALL)
6193 if (nla[NFTA_SET_ELEM_KEY_END])
6200 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
6201 const struct nlattr *attr, u32 nlmsg_flags)
6203 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
6204 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6205 u8 genmask = nft_genmask_next(ctx->net);
6206 u32 flags = 0, size = 0, num_exprs = 0;
6207 struct nft_set_ext_tmpl tmpl;
6208 struct nft_set_ext *ext, *ext2;
6209 struct nft_set_elem elem;
6210 struct nft_set_binding *binding;
6211 struct nft_object *obj = NULL;
6212 struct nft_userdata *udata;
6213 struct nft_data_desc desc;
6214 enum nft_registers dreg;
6215 struct nft_trans *trans;
6221 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6222 nft_set_elem_policy, NULL);
6226 nft_set_ext_prepare(&tmpl);
6228 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6232 if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
6233 (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
6237 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6242 if (set->flags & NFT_SET_MAP) {
6243 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
6244 !(flags & NFT_SET_ELEM_INTERVAL_END))
6247 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6251 if (set->flags & NFT_SET_OBJECT) {
6252 if (!nla[NFTA_SET_ELEM_OBJREF] &&
6253 !(flags & NFT_SET_ELEM_INTERVAL_END))
6256 if (nla[NFTA_SET_ELEM_OBJREF])
6260 if (!nft_setelem_valid_key_end(set, nla, flags))
6263 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
6264 (nla[NFTA_SET_ELEM_DATA] ||
6265 nla[NFTA_SET_ELEM_OBJREF] ||
6266 nla[NFTA_SET_ELEM_TIMEOUT] ||
6267 nla[NFTA_SET_ELEM_EXPIRATION] ||
6268 nla[NFTA_SET_ELEM_USERDATA] ||
6269 nla[NFTA_SET_ELEM_EXPR] ||
6270 nla[NFTA_SET_ELEM_KEY_END] ||
6271 nla[NFTA_SET_ELEM_EXPRESSIONS]))
6275 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
6276 if (!(set->flags & NFT_SET_TIMEOUT))
6278 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
6282 } else if (set->flags & NFT_SET_TIMEOUT &&
6283 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6284 timeout = READ_ONCE(set->timeout);
6288 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
6289 if (!(set->flags & NFT_SET_TIMEOUT))
6291 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
6297 if (nla[NFTA_SET_ELEM_EXPR]) {
6298 struct nft_expr *expr;
6300 if (set->num_exprs && set->num_exprs != 1)
6303 expr = nft_set_elem_expr_alloc(ctx, set,
6304 nla[NFTA_SET_ELEM_EXPR]);
6306 return PTR_ERR(expr);
6308 expr_array[0] = expr;
6311 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
6313 goto err_set_elem_expr;
6315 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
6316 struct nft_expr *expr;
6321 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6322 if (i == NFT_SET_EXPR_MAX ||
6323 (set->num_exprs && set->num_exprs == i)) {
6325 goto err_set_elem_expr;
6327 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6329 goto err_set_elem_expr;
6331 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6333 err = PTR_ERR(expr);
6334 goto err_set_elem_expr;
6336 expr_array[i] = expr;
6339 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6341 goto err_set_elem_expr;
6345 if (set->num_exprs && set->num_exprs != i) {
6347 goto err_set_elem_expr;
6349 } else if (set->num_exprs > 0 &&
6350 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6351 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6353 goto err_set_elem_expr_clone;
6355 num_exprs = set->num_exprs;
6358 if (nla[NFTA_SET_ELEM_KEY]) {
6359 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6360 nla[NFTA_SET_ELEM_KEY]);
6362 goto err_set_elem_expr;
6364 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6369 if (nla[NFTA_SET_ELEM_KEY_END]) {
6370 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6371 nla[NFTA_SET_ELEM_KEY_END]);
6375 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6377 goto err_parse_key_end;
6381 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6383 goto err_parse_key_end;
6385 if (timeout != READ_ONCE(set->timeout)) {
6386 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6388 goto err_parse_key_end;
6393 for (i = 0; i < num_exprs; i++)
6394 size += expr_array[i]->ops->size;
6396 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6397 sizeof(struct nft_set_elem_expr) + size);
6399 goto err_parse_key_end;
6402 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6403 obj = nft_obj_lookup(ctx->net, ctx->table,
6404 nla[NFTA_SET_ELEM_OBJREF],
6405 set->objtype, genmask);
6408 goto err_parse_key_end;
6410 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6412 goto err_parse_key_end;
6415 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6416 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6417 nla[NFTA_SET_ELEM_DATA]);
6419 goto err_parse_key_end;
6421 dreg = nft_type_to_reg(set->dtype);
6422 list_for_each_entry(binding, &set->bindings, list) {
6423 struct nft_ctx bind_ctx = {
6425 .family = ctx->family,
6426 .table = ctx->table,
6427 .chain = (struct nft_chain *)binding->chain,
6430 if (!(binding->flags & NFT_SET_MAP))
6433 err = nft_validate_register_store(&bind_ctx, dreg,
6435 desc.type, desc.len);
6437 goto err_parse_data;
6439 if (desc.type == NFT_DATA_VERDICT &&
6440 (elem.data.val.verdict.code == NFT_GOTO ||
6441 elem.data.val.verdict.code == NFT_JUMP))
6442 nft_validate_state_update(ctx->net,
6446 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6448 goto err_parse_data;
6451 /* The full maximum length of userdata can exceed the maximum
6452 * offset value (U8_MAX) for following extensions, therefor it
6453 * must be the last extension added.
6456 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6457 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6459 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6462 goto err_parse_data;
6466 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6467 elem.key_end.val.data, elem.data.val.data,
6468 timeout, expiration, GFP_KERNEL_ACCOUNT);
6469 if (IS_ERR(elem.priv)) {
6470 err = PTR_ERR(elem.priv);
6471 goto err_parse_data;
6474 ext = nft_set_elem_ext(set, elem.priv);
6476 *nft_set_ext_flags(ext) = flags;
6479 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6481 goto err_elem_userdata;
6483 udata = nft_set_ext_userdata(ext);
6484 udata->len = ulen - 1;
6485 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6488 *nft_set_ext_obj(ext) = obj;
6491 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6495 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6496 if (trans == NULL) {
6501 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6503 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6505 if (err == -EEXIST) {
6506 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6507 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6508 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6509 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6510 goto err_element_clash;
6511 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6512 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6513 memcmp(nft_set_ext_data(ext),
6514 nft_set_ext_data(ext2), set->dlen) != 0) ||
6515 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6516 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6517 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6518 goto err_element_clash;
6519 else if (!(nlmsg_flags & NLM_F_EXCL))
6521 } else if (err == -ENOTEMPTY) {
6522 /* ENOTEMPTY reports overlapping between this element
6523 * and an existing one.
6527 goto err_element_clash;
6530 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6531 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6536 nft_trans_elem(trans) = elem;
6537 nft_trans_commit_list_add_tail(ctx->net, trans);
6541 nft_setelem_remove(ctx->net, set, &elem);
6548 nft_set_elem_destroy(set, elem.priv, true);
6550 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6551 nft_data_release(&elem.data.val, desc.type);
6553 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6555 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6557 for (i = 0; i < num_exprs && expr_array[i]; i++)
6558 nft_expr_destroy(ctx, expr_array[i]);
6559 err_set_elem_expr_clone:
6563 static int nf_tables_newsetelem(struct sk_buff *skb,
6564 const struct nfnl_info *info,
6565 const struct nlattr * const nla[])
6567 struct nftables_pernet *nft_net = nft_pernet(info->net);
6568 struct netlink_ext_ack *extack = info->extack;
6569 u8 genmask = nft_genmask_next(info->net);
6570 u8 family = info->nfmsg->nfgen_family;
6571 struct net *net = info->net;
6572 const struct nlattr *attr;
6573 struct nft_table *table;
6574 struct nft_set *set;
6578 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6581 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6582 genmask, NETLINK_CB(skb).portid);
6583 if (IS_ERR(table)) {
6584 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6585 return PTR_ERR(table);
6588 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6589 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6591 return PTR_ERR(set);
6593 if (!list_empty(&set->bindings) &&
6594 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6597 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6599 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6600 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6602 NL_SET_BAD_ATTR(extack, attr);
6607 if (nft_net->validate_state == NFT_VALIDATE_DO)
6608 return nft_table_validate(net, table);
6614 * nft_data_hold - hold a nft_data item
6616 * @data: struct nft_data to release
6617 * @type: type of data
6619 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6620 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6621 * NFT_GOTO verdicts. This function must be called on active data objects
6622 * from the second phase of the commit protocol.
6624 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6626 struct nft_chain *chain;
6628 if (type == NFT_DATA_VERDICT) {
6629 switch (data->verdict.code) {
6632 chain = data->verdict.chain;
6639 static void nft_setelem_data_activate(const struct net *net,
6640 const struct nft_set *set,
6641 struct nft_set_elem *elem)
6643 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6645 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6646 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6647 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6648 (*nft_set_ext_obj(ext))->use++;
6651 static void nft_setelem_data_deactivate(const struct net *net,
6652 const struct nft_set *set,
6653 struct nft_set_elem *elem)
6655 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6657 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6658 nft_data_release(nft_set_ext_data(ext), set->dtype);
6659 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6660 (*nft_set_ext_obj(ext))->use--;
6663 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6664 const struct nlattr *attr)
6666 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6667 struct nft_set_ext_tmpl tmpl;
6668 struct nft_set_elem elem;
6669 struct nft_set_ext *ext;
6670 struct nft_trans *trans;
6674 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6675 nft_set_elem_policy, NULL);
6679 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6683 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6686 if (!nft_setelem_valid_key_end(set, nla, flags))
6689 nft_set_ext_prepare(&tmpl);
6692 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6697 if (nla[NFTA_SET_ELEM_KEY]) {
6698 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6699 nla[NFTA_SET_ELEM_KEY]);
6703 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6708 if (nla[NFTA_SET_ELEM_KEY_END]) {
6709 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6710 nla[NFTA_SET_ELEM_KEY_END]);
6714 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6716 goto fail_elem_key_end;
6720 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6721 elem.key_end.val.data, NULL, 0, 0,
6722 GFP_KERNEL_ACCOUNT);
6723 if (IS_ERR(elem.priv)) {
6724 err = PTR_ERR(elem.priv);
6725 goto fail_elem_key_end;
6728 ext = nft_set_elem_ext(set, elem.priv);
6730 *nft_set_ext_flags(ext) = flags;
6732 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6736 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6740 nft_setelem_data_deactivate(ctx->net, set, &elem);
6742 nft_trans_elem(trans) = elem;
6743 nft_trans_commit_list_add_tail(ctx->net, trans);
6751 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6753 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6757 static int nft_setelem_flush(const struct nft_ctx *ctx,
6758 struct nft_set *set,
6759 const struct nft_set_iter *iter,
6760 struct nft_set_elem *elem)
6762 struct nft_trans *trans;
6765 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6766 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6770 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6776 nft_setelem_data_deactivate(ctx->net, set, elem);
6777 nft_trans_elem_set(trans) = set;
6778 nft_trans_elem(trans) = *elem;
6779 nft_trans_commit_list_add_tail(ctx->net, trans);
6787 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6788 struct nft_set *set,
6789 struct nft_set_elem *elem)
6791 struct nft_trans *trans;
6793 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6794 sizeof(struct nft_trans_elem), GFP_KERNEL);
6798 nft_setelem_data_deactivate(ctx->net, set, elem);
6799 nft_trans_elem_set(trans) = set;
6800 nft_trans_elem(trans) = *elem;
6801 nft_trans_commit_list_add_tail(ctx->net, trans);
6806 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6807 struct nft_set *set)
6809 u8 genmask = nft_genmask_next(ctx->net);
6810 struct nft_set_elem_catchall *catchall;
6811 struct nft_set_elem elem;
6812 struct nft_set_ext *ext;
6815 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6816 ext = nft_set_elem_ext(set, catchall->elem);
6817 if (!nft_set_elem_active(ext, genmask) ||
6818 nft_set_elem_mark_busy(ext))
6821 elem.priv = catchall->elem;
6822 ret = __nft_set_catchall_flush(ctx, set, &elem);
6830 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6832 struct nft_set_iter iter = {
6834 .fn = nft_setelem_flush,
6837 set->ops->walk(ctx, set, &iter);
6839 iter.err = nft_set_catchall_flush(ctx, set);
6844 static int nf_tables_delsetelem(struct sk_buff *skb,
6845 const struct nfnl_info *info,
6846 const struct nlattr * const nla[])
6848 struct netlink_ext_ack *extack = info->extack;
6849 u8 genmask = nft_genmask_next(info->net);
6850 u8 family = info->nfmsg->nfgen_family;
6851 struct net *net = info->net;
6852 const struct nlattr *attr;
6853 struct nft_table *table;
6854 struct nft_set *set;
6858 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6859 genmask, NETLINK_CB(skb).portid);
6860 if (IS_ERR(table)) {
6861 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6862 return PTR_ERR(table);
6865 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6867 return PTR_ERR(set);
6869 if (!list_empty(&set->bindings) &&
6870 (set->flags & (NFT_SET_CONSTANT | NFT_SET_ANONYMOUS)))
6873 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6875 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6876 return nft_set_flush(&ctx, set, genmask);
6878 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6879 err = nft_del_setelem(&ctx, set, attr);
6881 NL_SET_BAD_ATTR(extack, attr);
6888 void nft_set_gc_batch_release(struct rcu_head *rcu)
6890 struct nft_set_gc_batch *gcb;
6893 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6894 for (i = 0; i < gcb->head.cnt; i++)
6895 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6899 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6902 struct nft_set_gc_batch *gcb;
6904 gcb = kzalloc(sizeof(*gcb), gfp);
6907 gcb->head.set = set;
6916 * nft_register_obj- register nf_tables stateful object type
6917 * @obj_type: object type
6919 * Registers the object type for use with nf_tables. Returns zero on
6920 * success or a negative errno code otherwise.
6922 int nft_register_obj(struct nft_object_type *obj_type)
6924 if (obj_type->type == NFT_OBJECT_UNSPEC)
6927 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6928 list_add_rcu(&obj_type->list, &nf_tables_objects);
6929 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6932 EXPORT_SYMBOL_GPL(nft_register_obj);
6935 * nft_unregister_obj - unregister nf_tables object type
6936 * @obj_type: object type
6938 * Unregisters the object type for use with nf_tables.
6940 void nft_unregister_obj(struct nft_object_type *obj_type)
6942 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6943 list_del_rcu(&obj_type->list);
6944 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6946 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6948 struct nft_object *nft_obj_lookup(const struct net *net,
6949 const struct nft_table *table,
6950 const struct nlattr *nla, u32 objtype,
6953 struct nft_object_hash_key k = { .table = table };
6954 char search[NFT_OBJ_MAXNAMELEN];
6955 struct rhlist_head *tmp, *list;
6956 struct nft_object *obj;
6958 nla_strscpy(search, nla, sizeof(search));
6961 WARN_ON_ONCE(!rcu_read_lock_held() &&
6962 !lockdep_commit_lock_is_held(net));
6965 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6969 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6970 if (objtype == obj->ops->type->type &&
6971 nft_active_genmask(obj, genmask)) {
6978 return ERR_PTR(-ENOENT);
6980 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6982 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6983 const struct nlattr *nla,
6984 u32 objtype, u8 genmask)
6986 struct nft_object *obj;
6988 list_for_each_entry(obj, &table->objects, list) {
6989 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6990 objtype == obj->ops->type->type &&
6991 nft_active_genmask(obj, genmask))
6994 return ERR_PTR(-ENOENT);
6997 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6998 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6999 .len = NFT_TABLE_MAXNAMELEN - 1 },
7000 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
7001 .len = NFT_OBJ_MAXNAMELEN - 1 },
7002 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
7003 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
7004 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
7005 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
7006 .len = NFT_USERDATA_MAXLEN },
7009 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
7010 const struct nft_object_type *type,
7011 const struct nlattr *attr)
7014 const struct nft_object_ops *ops;
7015 struct nft_object *obj;
7018 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
7023 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
7024 type->policy, NULL);
7028 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
7031 if (type->select_ops) {
7032 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
7042 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
7046 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
7059 return ERR_PTR(err);
7062 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
7063 struct nft_object *obj, bool reset)
7065 struct nlattr *nest;
7067 nest = nla_nest_start_noflag(skb, attr);
7069 goto nla_put_failure;
7070 if (obj->ops->dump(skb, obj, reset) < 0)
7071 goto nla_put_failure;
7072 nla_nest_end(skb, nest);
7079 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
7081 const struct nft_object_type *type;
7083 list_for_each_entry(type, &nf_tables_objects, list) {
7084 if (objtype == type->type)
7090 static const struct nft_object_type *
7091 nft_obj_type_get(struct net *net, u32 objtype)
7093 const struct nft_object_type *type;
7095 type = __nft_obj_type_get(objtype);
7096 if (type != NULL && try_module_get(type->owner))
7099 lockdep_nfnl_nft_mutex_not_held();
7100 #ifdef CONFIG_MODULES
7102 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
7103 return ERR_PTR(-EAGAIN);
7106 return ERR_PTR(-ENOENT);
7109 static int nf_tables_updobj(const struct nft_ctx *ctx,
7110 const struct nft_object_type *type,
7111 const struct nlattr *attr,
7112 struct nft_object *obj)
7114 struct nft_object *newobj;
7115 struct nft_trans *trans;
7118 if (!try_module_get(type->owner))
7121 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
7122 sizeof(struct nft_trans_obj));
7126 newobj = nft_obj_init(ctx, type, attr);
7127 if (IS_ERR(newobj)) {
7128 err = PTR_ERR(newobj);
7129 goto err_free_trans;
7132 nft_trans_obj(trans) = obj;
7133 nft_trans_obj_update(trans) = true;
7134 nft_trans_obj_newobj(trans) = newobj;
7135 nft_trans_commit_list_add_tail(ctx->net, trans);
7142 module_put(type->owner);
7146 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
7147 const struct nlattr * const nla[])
7149 struct netlink_ext_ack *extack = info->extack;
7150 u8 genmask = nft_genmask_next(info->net);
7151 u8 family = info->nfmsg->nfgen_family;
7152 const struct nft_object_type *type;
7153 struct net *net = info->net;
7154 struct nft_table *table;
7155 struct nft_object *obj;
7160 if (!nla[NFTA_OBJ_TYPE] ||
7161 !nla[NFTA_OBJ_NAME] ||
7162 !nla[NFTA_OBJ_DATA])
7165 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7166 NETLINK_CB(skb).portid);
7167 if (IS_ERR(table)) {
7168 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7169 return PTR_ERR(table);
7172 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7173 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7176 if (err != -ENOENT) {
7177 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7181 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7182 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7185 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
7188 type = __nft_obj_type_get(objtype);
7189 if (WARN_ON_ONCE(!type))
7192 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7194 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
7197 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7199 type = nft_obj_type_get(net, objtype);
7201 return PTR_ERR(type);
7203 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
7208 obj->key.table = table;
7209 obj->handle = nf_tables_alloc_handle(table);
7211 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
7212 if (!obj->key.name) {
7217 if (nla[NFTA_OBJ_USERDATA]) {
7218 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL_ACCOUNT);
7219 if (obj->udata == NULL)
7222 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
7225 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
7229 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
7230 nft_objname_ht_params);
7234 list_add_tail_rcu(&obj->list, &table->objects);
7238 /* queued in transaction log */
7239 INIT_LIST_HEAD(&obj->list);
7244 kfree(obj->key.name);
7246 if (obj->ops->destroy)
7247 obj->ops->destroy(&ctx, obj);
7250 module_put(type->owner);
7254 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
7255 u32 portid, u32 seq, int event, u32 flags,
7256 int family, const struct nft_table *table,
7257 struct nft_object *obj, bool reset)
7259 struct nlmsghdr *nlh;
7261 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7262 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7263 NFNETLINK_V0, nft_base_seq(net));
7265 goto nla_put_failure;
7267 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
7268 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
7269 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
7270 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
7271 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
7272 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
7274 goto nla_put_failure;
7277 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
7278 goto nla_put_failure;
7280 nlmsg_end(skb, nlh);
7284 nlmsg_trim(skb, nlh);
7288 struct nft_obj_filter {
7293 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
7295 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7296 const struct nft_table *table;
7297 unsigned int idx = 0, s_idx = cb->args[0];
7298 struct nft_obj_filter *filter = cb->data;
7299 struct net *net = sock_net(skb->sk);
7300 int family = nfmsg->nfgen_family;
7301 struct nftables_pernet *nft_net;
7302 struct nft_object *obj;
7305 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7309 nft_net = nft_pernet(net);
7310 cb->seq = READ_ONCE(nft_net->base_seq);
7312 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7313 if (family != NFPROTO_UNSPEC && family != table->family)
7316 list_for_each_entry_rcu(obj, &table->objects, list) {
7317 if (!nft_is_active(net, obj))
7322 memset(&cb->args[1], 0,
7323 sizeof(cb->args) - sizeof(cb->args[0]));
7324 if (filter && filter->table &&
7325 strcmp(filter->table, table->name))
7328 filter->type != NFT_OBJECT_UNSPEC &&
7329 obj->ops->type->type != filter->type)
7332 char *buf = kasprintf(GFP_ATOMIC,
7337 audit_log_nfcfg(buf,
7340 AUDIT_NFT_OP_OBJ_RESET,
7345 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7348 NLM_F_MULTI | NLM_F_APPEND,
7349 table->family, table,
7353 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7365 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7367 const struct nlattr * const *nla = cb->data;
7368 struct nft_obj_filter *filter = NULL;
7370 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7371 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7375 if (nla[NFTA_OBJ_TABLE]) {
7376 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7377 if (!filter->table) {
7383 if (nla[NFTA_OBJ_TYPE])
7384 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7391 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7393 struct nft_obj_filter *filter = cb->data;
7396 kfree(filter->table);
7403 /* called with rcu_read_lock held */
7404 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7405 const struct nlattr * const nla[])
7407 struct netlink_ext_ack *extack = info->extack;
7408 u8 genmask = nft_genmask_cur(info->net);
7409 u8 family = info->nfmsg->nfgen_family;
7410 const struct nft_table *table;
7411 struct net *net = info->net;
7412 struct nft_object *obj;
7413 struct sk_buff *skb2;
7418 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7419 struct netlink_dump_control c = {
7420 .start = nf_tables_dump_obj_start,
7421 .dump = nf_tables_dump_obj,
7422 .done = nf_tables_dump_obj_done,
7423 .module = THIS_MODULE,
7424 .data = (void *)nla,
7427 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7430 if (!nla[NFTA_OBJ_NAME] ||
7431 !nla[NFTA_OBJ_TYPE])
7434 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7435 if (IS_ERR(table)) {
7436 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7437 return PTR_ERR(table);
7440 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7441 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7443 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7444 return PTR_ERR(obj);
7447 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7451 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7455 const struct nftables_pernet *nft_net;
7458 nft_net = nft_pernet(net);
7459 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7461 audit_log_nfcfg(buf,
7464 AUDIT_NFT_OP_OBJ_RESET,
7469 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7470 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7471 family, table, obj, reset);
7473 goto err_fill_obj_info;
7475 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7482 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7484 if (obj->ops->destroy)
7485 obj->ops->destroy(ctx, obj);
7487 module_put(obj->ops->type->owner);
7488 kfree(obj->key.name);
7493 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7494 const struct nlattr * const nla[])
7496 struct netlink_ext_ack *extack = info->extack;
7497 u8 genmask = nft_genmask_next(info->net);
7498 u8 family = info->nfmsg->nfgen_family;
7499 struct net *net = info->net;
7500 const struct nlattr *attr;
7501 struct nft_table *table;
7502 struct nft_object *obj;
7506 if (!nla[NFTA_OBJ_TYPE] ||
7507 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7510 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7511 NETLINK_CB(skb).portid);
7512 if (IS_ERR(table)) {
7513 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7514 return PTR_ERR(table);
7517 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7518 if (nla[NFTA_OBJ_HANDLE]) {
7519 attr = nla[NFTA_OBJ_HANDLE];
7520 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7522 attr = nla[NFTA_OBJ_NAME];
7523 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7527 NL_SET_BAD_ATTR(extack, attr);
7528 return PTR_ERR(obj);
7531 NL_SET_BAD_ATTR(extack, attr);
7535 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7537 return nft_delobj(&ctx, obj);
7540 void nft_obj_notify(struct net *net, const struct nft_table *table,
7541 struct nft_object *obj, u32 portid, u32 seq, int event,
7542 u16 flags, int family, int report, gfp_t gfp)
7544 struct nftables_pernet *nft_net = nft_pernet(net);
7545 struct sk_buff *skb;
7547 char *buf = kasprintf(gfp, "%s:%u",
7548 table->name, nft_net->base_seq);
7550 audit_log_nfcfg(buf,
7553 event == NFT_MSG_NEWOBJ ?
7554 AUDIT_NFT_OP_OBJ_REGISTER :
7555 AUDIT_NFT_OP_OBJ_UNREGISTER,
7560 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7563 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7567 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7568 flags & (NLM_F_CREATE | NLM_F_EXCL),
7569 family, table, obj, false);
7575 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7578 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7580 EXPORT_SYMBOL_GPL(nft_obj_notify);
7582 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7583 struct nft_object *obj, int event)
7585 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7586 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7592 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7594 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7595 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7596 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7598 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7600 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7602 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7603 list_del_rcu(&type->list);
7604 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7606 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7608 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7609 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7610 .len = NFT_NAME_MAXLEN - 1 },
7611 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7612 .len = NFT_NAME_MAXLEN - 1 },
7613 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7614 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7615 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7618 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7619 const struct nlattr *nla, u8 genmask)
7621 struct nft_flowtable *flowtable;
7623 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7624 if (!nla_strcmp(nla, flowtable->name) &&
7625 nft_active_genmask(flowtable, genmask))
7628 return ERR_PTR(-ENOENT);
7630 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7632 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7633 struct nft_flowtable *flowtable,
7634 enum nft_trans_phase phase)
7637 case NFT_TRANS_PREPARE_ERROR:
7638 case NFT_TRANS_PREPARE:
7639 case NFT_TRANS_ABORT:
7640 case NFT_TRANS_RELEASE:
7647 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7649 static struct nft_flowtable *
7650 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7651 const struct nlattr *nla, u8 genmask)
7653 struct nft_flowtable *flowtable;
7655 list_for_each_entry(flowtable, &table->flowtables, list) {
7656 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7657 nft_active_genmask(flowtable, genmask))
7660 return ERR_PTR(-ENOENT);
7663 struct nft_flowtable_hook {
7666 struct list_head list;
7669 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7670 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7671 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7672 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7675 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7676 const struct nlattr *attr,
7677 struct nft_flowtable_hook *flowtable_hook,
7678 struct nft_flowtable *flowtable, bool add)
7680 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7681 struct nft_hook *hook;
7682 int hooknum, priority;
7685 INIT_LIST_HEAD(&flowtable_hook->list);
7687 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7688 nft_flowtable_hook_policy, NULL);
7693 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7694 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7697 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7698 if (hooknum != NF_NETDEV_INGRESS)
7701 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7703 flowtable_hook->priority = priority;
7704 flowtable_hook->num = hooknum;
7706 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7707 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7708 if (hooknum != flowtable->hooknum)
7712 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7713 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7714 if (priority != flowtable->data.priority)
7718 flowtable_hook->priority = flowtable->data.priority;
7719 flowtable_hook->num = flowtable->hooknum;
7722 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7723 err = nf_tables_parse_netdev_hooks(ctx->net,
7724 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7725 &flowtable_hook->list);
7730 list_for_each_entry(hook, &flowtable_hook->list, list) {
7731 hook->ops.pf = NFPROTO_NETDEV;
7732 hook->ops.hooknum = flowtable_hook->num;
7733 hook->ops.priority = flowtable_hook->priority;
7734 hook->ops.priv = &flowtable->data;
7735 hook->ops.hook = flowtable->data.type->hook;
7741 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7743 const struct nf_flowtable_type *type;
7745 list_for_each_entry(type, &nf_tables_flowtables, list) {
7746 if (family == type->family)
7752 static const struct nf_flowtable_type *
7753 nft_flowtable_type_get(struct net *net, u8 family)
7755 const struct nf_flowtable_type *type;
7757 type = __nft_flowtable_type_get(family);
7758 if (type != NULL && try_module_get(type->owner))
7761 lockdep_nfnl_nft_mutex_not_held();
7762 #ifdef CONFIG_MODULES
7764 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7765 return ERR_PTR(-EAGAIN);
7768 return ERR_PTR(-ENOENT);
7771 /* Only called from error and netdev event paths. */
7772 static void nft_unregister_flowtable_hook(struct net *net,
7773 struct nft_flowtable *flowtable,
7774 struct nft_hook *hook)
7776 nf_unregister_net_hook(net, &hook->ops);
7777 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7781 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7782 struct list_head *hook_list,
7783 bool release_netdev)
7785 struct nft_hook *hook, *next;
7787 list_for_each_entry_safe(hook, next, hook_list, list) {
7788 nf_unregister_net_hook(net, &hook->ops);
7789 if (release_netdev) {
7790 list_del(&hook->list);
7791 kfree_rcu(hook, rcu);
7796 static void nft_unregister_flowtable_net_hooks(struct net *net,
7797 struct list_head *hook_list)
7799 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7802 static int nft_register_flowtable_net_hooks(struct net *net,
7803 struct nft_table *table,
7804 struct list_head *hook_list,
7805 struct nft_flowtable *flowtable)
7807 struct nft_hook *hook, *hook2, *next;
7808 struct nft_flowtable *ft;
7811 list_for_each_entry(hook, hook_list, list) {
7812 list_for_each_entry(ft, &table->flowtables, list) {
7813 if (!nft_is_active_next(net, ft))
7816 list_for_each_entry(hook2, &ft->hook_list, list) {
7817 if (hook->ops.dev == hook2->ops.dev &&
7818 hook->ops.pf == hook2->ops.pf) {
7820 goto err_unregister_net_hooks;
7825 err = flowtable->data.type->setup(&flowtable->data,
7829 goto err_unregister_net_hooks;
7831 err = nf_register_net_hook(net, &hook->ops);
7833 flowtable->data.type->setup(&flowtable->data,
7836 goto err_unregister_net_hooks;
7844 err_unregister_net_hooks:
7845 list_for_each_entry_safe(hook, next, hook_list, list) {
7849 nft_unregister_flowtable_hook(net, flowtable, hook);
7850 list_del_rcu(&hook->list);
7851 kfree_rcu(hook, rcu);
7857 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7859 struct nft_hook *hook, *next;
7861 list_for_each_entry_safe(hook, next, hook_list, list) {
7862 list_del_rcu(&hook->list);
7863 kfree_rcu(hook, rcu);
7867 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7868 struct nft_flowtable *flowtable)
7870 const struct nlattr * const *nla = ctx->nla;
7871 struct nft_flowtable_hook flowtable_hook;
7872 struct nft_hook *hook, *next;
7873 struct nft_trans *trans;
7874 bool unregister = false;
7878 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7879 &flowtable_hook, flowtable, false);
7883 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7884 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7885 list_del(&hook->list);
7890 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7891 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7892 if (flags & ~NFT_FLOWTABLE_MASK) {
7894 goto err_flowtable_update_hook;
7896 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7897 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7899 goto err_flowtable_update_hook;
7902 flags = flowtable->data.flags;
7905 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7906 &flowtable_hook.list, flowtable);
7908 goto err_flowtable_update_hook;
7910 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7911 sizeof(struct nft_trans_flowtable));
7915 goto err_flowtable_update_hook;
7918 nft_trans_flowtable_flags(trans) = flags;
7919 nft_trans_flowtable(trans) = flowtable;
7920 nft_trans_flowtable_update(trans) = true;
7921 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7922 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7924 nft_trans_commit_list_add_tail(ctx->net, trans);
7928 err_flowtable_update_hook:
7929 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7931 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7932 list_del_rcu(&hook->list);
7933 kfree_rcu(hook, rcu);
7940 static int nf_tables_newflowtable(struct sk_buff *skb,
7941 const struct nfnl_info *info,
7942 const struct nlattr * const nla[])
7944 struct netlink_ext_ack *extack = info->extack;
7945 struct nft_flowtable_hook flowtable_hook;
7946 u8 genmask = nft_genmask_next(info->net);
7947 u8 family = info->nfmsg->nfgen_family;
7948 const struct nf_flowtable_type *type;
7949 struct nft_flowtable *flowtable;
7950 struct nft_hook *hook, *next;
7951 struct net *net = info->net;
7952 struct nft_table *table;
7956 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7957 !nla[NFTA_FLOWTABLE_NAME] ||
7958 !nla[NFTA_FLOWTABLE_HOOK])
7961 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7962 genmask, NETLINK_CB(skb).portid);
7963 if (IS_ERR(table)) {
7964 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7965 return PTR_ERR(table);
7968 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7970 if (IS_ERR(flowtable)) {
7971 err = PTR_ERR(flowtable);
7972 if (err != -ENOENT) {
7973 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7977 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7978 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7982 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7984 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7987 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7989 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7993 flowtable->table = table;
7994 flowtable->handle = nf_tables_alloc_handle(table);
7995 INIT_LIST_HEAD(&flowtable->hook_list);
7997 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7998 if (!flowtable->name) {
8003 type = nft_flowtable_type_get(net, family);
8005 err = PTR_ERR(type);
8009 if (nla[NFTA_FLOWTABLE_FLAGS]) {
8010 flowtable->data.flags =
8011 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
8012 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
8018 write_pnet(&flowtable->data.net, net);
8019 flowtable->data.type = type;
8020 err = type->init(&flowtable->data);
8024 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
8025 &flowtable_hook, flowtable, true);
8029 list_splice(&flowtable_hook.list, &flowtable->hook_list);
8030 flowtable->data.priority = flowtable_hook.priority;
8031 flowtable->hooknum = flowtable_hook.num;
8033 err = nft_register_flowtable_net_hooks(ctx.net, table,
8034 &flowtable->hook_list,
8037 nft_flowtable_hooks_destroy(&flowtable->hook_list);
8041 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
8045 list_add_tail_rcu(&flowtable->list, &table->flowtables);
8050 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8051 nft_unregister_flowtable_hook(net, flowtable, hook);
8052 list_del_rcu(&hook->list);
8053 kfree_rcu(hook, rcu);
8056 flowtable->data.type->free(&flowtable->data);
8058 module_put(type->owner);
8060 kfree(flowtable->name);
8066 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
8068 struct nft_hook *this, *next;
8070 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
8071 list_del(&this->list);
8076 static int nft_delflowtable_hook(struct nft_ctx *ctx,
8077 struct nft_flowtable *flowtable)
8079 const struct nlattr * const *nla = ctx->nla;
8080 struct nft_flowtable_hook flowtable_hook;
8081 LIST_HEAD(flowtable_del_list);
8082 struct nft_hook *this, *hook;
8083 struct nft_trans *trans;
8086 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
8087 &flowtable_hook, flowtable, false);
8091 list_for_each_entry(this, &flowtable_hook.list, list) {
8092 hook = nft_hook_list_find(&flowtable->hook_list, this);
8095 goto err_flowtable_del_hook;
8097 list_move(&hook->list, &flowtable_del_list);
8100 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
8101 sizeof(struct nft_trans_flowtable));
8104 goto err_flowtable_del_hook;
8107 nft_trans_flowtable(trans) = flowtable;
8108 nft_trans_flowtable_update(trans) = true;
8109 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
8110 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
8111 nft_flowtable_hook_release(&flowtable_hook);
8113 nft_trans_commit_list_add_tail(ctx->net, trans);
8117 err_flowtable_del_hook:
8118 list_splice(&flowtable_del_list, &flowtable->hook_list);
8119 nft_flowtable_hook_release(&flowtable_hook);
8124 static int nf_tables_delflowtable(struct sk_buff *skb,
8125 const struct nfnl_info *info,
8126 const struct nlattr * const nla[])
8128 struct netlink_ext_ack *extack = info->extack;
8129 u8 genmask = nft_genmask_next(info->net);
8130 u8 family = info->nfmsg->nfgen_family;
8131 struct nft_flowtable *flowtable;
8132 struct net *net = info->net;
8133 const struct nlattr *attr;
8134 struct nft_table *table;
8137 if (!nla[NFTA_FLOWTABLE_TABLE] ||
8138 (!nla[NFTA_FLOWTABLE_NAME] &&
8139 !nla[NFTA_FLOWTABLE_HANDLE]))
8142 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8143 genmask, NETLINK_CB(skb).portid);
8144 if (IS_ERR(table)) {
8145 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
8146 return PTR_ERR(table);
8149 if (nla[NFTA_FLOWTABLE_HANDLE]) {
8150 attr = nla[NFTA_FLOWTABLE_HANDLE];
8151 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
8153 attr = nla[NFTA_FLOWTABLE_NAME];
8154 flowtable = nft_flowtable_lookup(table, attr, genmask);
8157 if (IS_ERR(flowtable)) {
8158 NL_SET_BAD_ATTR(extack, attr);
8159 return PTR_ERR(flowtable);
8162 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
8164 if (nla[NFTA_FLOWTABLE_HOOK])
8165 return nft_delflowtable_hook(&ctx, flowtable);
8167 if (flowtable->use > 0) {
8168 NL_SET_BAD_ATTR(extack, attr);
8172 return nft_delflowtable(&ctx, flowtable);
8175 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
8176 u32 portid, u32 seq, int event,
8177 u32 flags, int family,
8178 struct nft_flowtable *flowtable,
8179 struct list_head *hook_list)
8181 struct nlattr *nest, *nest_devs;
8182 struct nft_hook *hook;
8183 struct nlmsghdr *nlh;
8185 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
8186 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
8187 NFNETLINK_V0, nft_base_seq(net));
8189 goto nla_put_failure;
8191 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
8192 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
8193 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
8194 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
8195 NFTA_FLOWTABLE_PAD) ||
8196 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
8197 goto nla_put_failure;
8199 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
8201 goto nla_put_failure;
8202 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
8203 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
8204 goto nla_put_failure;
8206 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
8208 goto nla_put_failure;
8210 list_for_each_entry_rcu(hook, hook_list, list) {
8211 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
8212 goto nla_put_failure;
8214 nla_nest_end(skb, nest_devs);
8215 nla_nest_end(skb, nest);
8217 nlmsg_end(skb, nlh);
8221 nlmsg_trim(skb, nlh);
8225 struct nft_flowtable_filter {
8229 static int nf_tables_dump_flowtable(struct sk_buff *skb,
8230 struct netlink_callback *cb)
8232 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
8233 struct nft_flowtable_filter *filter = cb->data;
8234 unsigned int idx = 0, s_idx = cb->args[0];
8235 struct net *net = sock_net(skb->sk);
8236 int family = nfmsg->nfgen_family;
8237 struct nft_flowtable *flowtable;
8238 struct nftables_pernet *nft_net;
8239 const struct nft_table *table;
8242 nft_net = nft_pernet(net);
8243 cb->seq = READ_ONCE(nft_net->base_seq);
8245 list_for_each_entry_rcu(table, &nft_net->tables, list) {
8246 if (family != NFPROTO_UNSPEC && family != table->family)
8249 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
8250 if (!nft_is_active(net, flowtable))
8255 memset(&cb->args[1], 0,
8256 sizeof(cb->args) - sizeof(cb->args[0]));
8257 if (filter && filter->table &&
8258 strcmp(filter->table, table->name))
8261 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
8263 NFT_MSG_NEWFLOWTABLE,
8264 NLM_F_MULTI | NLM_F_APPEND,
8267 &flowtable->hook_list) < 0)
8270 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
8282 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
8284 const struct nlattr * const *nla = cb->data;
8285 struct nft_flowtable_filter *filter = NULL;
8287 if (nla[NFTA_FLOWTABLE_TABLE]) {
8288 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
8292 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
8294 if (!filter->table) {
8304 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
8306 struct nft_flowtable_filter *filter = cb->data;
8311 kfree(filter->table);
8317 /* called with rcu_read_lock held */
8318 static int nf_tables_getflowtable(struct sk_buff *skb,
8319 const struct nfnl_info *info,
8320 const struct nlattr * const nla[])
8322 u8 genmask = nft_genmask_cur(info->net);
8323 u8 family = info->nfmsg->nfgen_family;
8324 struct nft_flowtable *flowtable;
8325 const struct nft_table *table;
8326 struct net *net = info->net;
8327 struct sk_buff *skb2;
8330 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8331 struct netlink_dump_control c = {
8332 .start = nf_tables_dump_flowtable_start,
8333 .dump = nf_tables_dump_flowtable,
8334 .done = nf_tables_dump_flowtable_done,
8335 .module = THIS_MODULE,
8336 .data = (void *)nla,
8339 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8342 if (!nla[NFTA_FLOWTABLE_NAME])
8345 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8348 return PTR_ERR(table);
8350 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8352 if (IS_ERR(flowtable))
8353 return PTR_ERR(flowtable);
8355 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8359 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8360 info->nlh->nlmsg_seq,
8361 NFT_MSG_NEWFLOWTABLE, 0, family,
8362 flowtable, &flowtable->hook_list);
8364 goto err_fill_flowtable_info;
8366 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8368 err_fill_flowtable_info:
8373 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8374 struct nft_flowtable *flowtable,
8375 struct list_head *hook_list,
8378 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8379 struct sk_buff *skb;
8384 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8387 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8391 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8392 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8394 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8395 ctx->seq, event, flags,
8396 ctx->family, flowtable, hook_list);
8402 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8405 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8408 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8410 struct nft_hook *hook, *next;
8412 flowtable->data.type->free(&flowtable->data);
8413 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8414 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8416 list_del_rcu(&hook->list);
8419 kfree(flowtable->name);
8420 module_put(flowtable->data.type->owner);
8424 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8425 u32 portid, u32 seq)
8427 struct nftables_pernet *nft_net = nft_pernet(net);
8428 struct nlmsghdr *nlh;
8429 char buf[TASK_COMM_LEN];
8430 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8432 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8433 NFNETLINK_V0, nft_base_seq(net));
8435 goto nla_put_failure;
8437 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8438 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8439 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8440 goto nla_put_failure;
8442 nlmsg_end(skb, nlh);
8446 nlmsg_trim(skb, nlh);
8450 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8451 struct nft_flowtable *flowtable)
8453 struct nft_hook *hook;
8455 list_for_each_entry(hook, &flowtable->hook_list, list) {
8456 if (hook->ops.dev != dev)
8459 /* flow_offload_netdev_event() cleans up entries for us. */
8460 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8461 list_del_rcu(&hook->list);
8462 kfree_rcu(hook, rcu);
8467 static int nf_tables_flowtable_event(struct notifier_block *this,
8468 unsigned long event, void *ptr)
8470 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8471 struct nft_flowtable *flowtable;
8472 struct nftables_pernet *nft_net;
8473 struct nft_table *table;
8476 if (event != NETDEV_UNREGISTER)
8480 nft_net = nft_pernet(net);
8481 mutex_lock(&nft_net->commit_mutex);
8482 list_for_each_entry(table, &nft_net->tables, list) {
8483 list_for_each_entry(flowtable, &table->flowtables, list) {
8484 nft_flowtable_event(event, dev, flowtable);
8487 mutex_unlock(&nft_net->commit_mutex);
8492 static struct notifier_block nf_tables_flowtable_notifier = {
8493 .notifier_call = nf_tables_flowtable_event,
8496 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8499 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8500 struct sk_buff *skb2;
8503 if (!nlmsg_report(nlh) &&
8504 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8507 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8511 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8518 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8519 nlmsg_report(nlh), GFP_KERNEL);
8522 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8526 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8527 const struct nlattr * const nla[])
8529 struct sk_buff *skb2;
8532 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8536 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8537 info->nlh->nlmsg_seq);
8539 goto err_fill_gen_info;
8541 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8548 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8549 [NFT_MSG_NEWTABLE] = {
8550 .call = nf_tables_newtable,
8551 .type = NFNL_CB_BATCH,
8552 .attr_count = NFTA_TABLE_MAX,
8553 .policy = nft_table_policy,
8555 [NFT_MSG_GETTABLE] = {
8556 .call = nf_tables_gettable,
8557 .type = NFNL_CB_RCU,
8558 .attr_count = NFTA_TABLE_MAX,
8559 .policy = nft_table_policy,
8561 [NFT_MSG_DELTABLE] = {
8562 .call = nf_tables_deltable,
8563 .type = NFNL_CB_BATCH,
8564 .attr_count = NFTA_TABLE_MAX,
8565 .policy = nft_table_policy,
8567 [NFT_MSG_NEWCHAIN] = {
8568 .call = nf_tables_newchain,
8569 .type = NFNL_CB_BATCH,
8570 .attr_count = NFTA_CHAIN_MAX,
8571 .policy = nft_chain_policy,
8573 [NFT_MSG_GETCHAIN] = {
8574 .call = nf_tables_getchain,
8575 .type = NFNL_CB_RCU,
8576 .attr_count = NFTA_CHAIN_MAX,
8577 .policy = nft_chain_policy,
8579 [NFT_MSG_DELCHAIN] = {
8580 .call = nf_tables_delchain,
8581 .type = NFNL_CB_BATCH,
8582 .attr_count = NFTA_CHAIN_MAX,
8583 .policy = nft_chain_policy,
8585 [NFT_MSG_NEWRULE] = {
8586 .call = nf_tables_newrule,
8587 .type = NFNL_CB_BATCH,
8588 .attr_count = NFTA_RULE_MAX,
8589 .policy = nft_rule_policy,
8591 [NFT_MSG_GETRULE] = {
8592 .call = nf_tables_getrule,
8593 .type = NFNL_CB_RCU,
8594 .attr_count = NFTA_RULE_MAX,
8595 .policy = nft_rule_policy,
8597 [NFT_MSG_DELRULE] = {
8598 .call = nf_tables_delrule,
8599 .type = NFNL_CB_BATCH,
8600 .attr_count = NFTA_RULE_MAX,
8601 .policy = nft_rule_policy,
8603 [NFT_MSG_NEWSET] = {
8604 .call = nf_tables_newset,
8605 .type = NFNL_CB_BATCH,
8606 .attr_count = NFTA_SET_MAX,
8607 .policy = nft_set_policy,
8609 [NFT_MSG_GETSET] = {
8610 .call = nf_tables_getset,
8611 .type = NFNL_CB_RCU,
8612 .attr_count = NFTA_SET_MAX,
8613 .policy = nft_set_policy,
8615 [NFT_MSG_DELSET] = {
8616 .call = nf_tables_delset,
8617 .type = NFNL_CB_BATCH,
8618 .attr_count = NFTA_SET_MAX,
8619 .policy = nft_set_policy,
8621 [NFT_MSG_NEWSETELEM] = {
8622 .call = nf_tables_newsetelem,
8623 .type = NFNL_CB_BATCH,
8624 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8625 .policy = nft_set_elem_list_policy,
8627 [NFT_MSG_GETSETELEM] = {
8628 .call = nf_tables_getsetelem,
8629 .type = NFNL_CB_RCU,
8630 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8631 .policy = nft_set_elem_list_policy,
8633 [NFT_MSG_DELSETELEM] = {
8634 .call = nf_tables_delsetelem,
8635 .type = NFNL_CB_BATCH,
8636 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8637 .policy = nft_set_elem_list_policy,
8639 [NFT_MSG_GETGEN] = {
8640 .call = nf_tables_getgen,
8641 .type = NFNL_CB_RCU,
8643 [NFT_MSG_NEWOBJ] = {
8644 .call = nf_tables_newobj,
8645 .type = NFNL_CB_BATCH,
8646 .attr_count = NFTA_OBJ_MAX,
8647 .policy = nft_obj_policy,
8649 [NFT_MSG_GETOBJ] = {
8650 .call = nf_tables_getobj,
8651 .type = NFNL_CB_RCU,
8652 .attr_count = NFTA_OBJ_MAX,
8653 .policy = nft_obj_policy,
8655 [NFT_MSG_DELOBJ] = {
8656 .call = nf_tables_delobj,
8657 .type = NFNL_CB_BATCH,
8658 .attr_count = NFTA_OBJ_MAX,
8659 .policy = nft_obj_policy,
8661 [NFT_MSG_GETOBJ_RESET] = {
8662 .call = nf_tables_getobj,
8663 .type = NFNL_CB_RCU,
8664 .attr_count = NFTA_OBJ_MAX,
8665 .policy = nft_obj_policy,
8667 [NFT_MSG_NEWFLOWTABLE] = {
8668 .call = nf_tables_newflowtable,
8669 .type = NFNL_CB_BATCH,
8670 .attr_count = NFTA_FLOWTABLE_MAX,
8671 .policy = nft_flowtable_policy,
8673 [NFT_MSG_GETFLOWTABLE] = {
8674 .call = nf_tables_getflowtable,
8675 .type = NFNL_CB_RCU,
8676 .attr_count = NFTA_FLOWTABLE_MAX,
8677 .policy = nft_flowtable_policy,
8679 [NFT_MSG_DELFLOWTABLE] = {
8680 .call = nf_tables_delflowtable,
8681 .type = NFNL_CB_BATCH,
8682 .attr_count = NFTA_FLOWTABLE_MAX,
8683 .policy = nft_flowtable_policy,
8687 static int nf_tables_validate(struct net *net)
8689 struct nftables_pernet *nft_net = nft_pernet(net);
8690 struct nft_table *table;
8692 switch (nft_net->validate_state) {
8693 case NFT_VALIDATE_SKIP:
8695 case NFT_VALIDATE_NEED:
8696 nft_validate_state_update(net, NFT_VALIDATE_DO);
8698 case NFT_VALIDATE_DO:
8699 list_for_each_entry(table, &nft_net->tables, list) {
8700 if (nft_table_validate(net, table) < 0)
8704 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
8711 /* a drop policy has to be deferred until all rules have been activated,
8712 * otherwise a large ruleset that contains a drop-policy base chain will
8713 * cause all packets to get dropped until the full transaction has been
8716 * We defer the drop policy until the transaction has been finalized.
8718 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8720 struct nft_base_chain *basechain;
8722 if (nft_trans_chain_policy(trans) != NF_DROP)
8725 if (!nft_is_base_chain(trans->ctx.chain))
8728 basechain = nft_base_chain(trans->ctx.chain);
8729 basechain->policy = NF_DROP;
8732 static void nft_chain_commit_update(struct nft_trans *trans)
8734 struct nft_base_chain *basechain;
8736 if (nft_trans_chain_name(trans)) {
8737 rhltable_remove(&trans->ctx.table->chains_ht,
8738 &trans->ctx.chain->rhlhead,
8739 nft_chain_ht_params);
8740 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8741 rhltable_insert_key(&trans->ctx.table->chains_ht,
8742 trans->ctx.chain->name,
8743 &trans->ctx.chain->rhlhead,
8744 nft_chain_ht_params);
8747 if (!nft_is_base_chain(trans->ctx.chain))
8750 nft_chain_stats_replace(trans);
8752 basechain = nft_base_chain(trans->ctx.chain);
8754 switch (nft_trans_chain_policy(trans)) {
8757 basechain->policy = nft_trans_chain_policy(trans);
8762 static void nft_obj_commit_update(struct nft_trans *trans)
8764 struct nft_object *newobj;
8765 struct nft_object *obj;
8767 obj = nft_trans_obj(trans);
8768 newobj = nft_trans_obj_newobj(trans);
8770 if (obj->ops->update)
8771 obj->ops->update(obj, newobj);
8773 nft_obj_destroy(&trans->ctx, newobj);
8776 static void nft_commit_release(struct nft_trans *trans)
8778 switch (trans->msg_type) {
8779 case NFT_MSG_DELTABLE:
8780 nf_tables_table_destroy(&trans->ctx);
8782 case NFT_MSG_NEWCHAIN:
8783 free_percpu(nft_trans_chain_stats(trans));
8784 kfree(nft_trans_chain_name(trans));
8786 case NFT_MSG_DELCHAIN:
8787 nf_tables_chain_destroy(&trans->ctx);
8789 case NFT_MSG_DELRULE:
8790 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8792 case NFT_MSG_DELSET:
8793 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8795 case NFT_MSG_DELSETELEM:
8796 nf_tables_set_elem_destroy(&trans->ctx,
8797 nft_trans_elem_set(trans),
8798 nft_trans_elem(trans).priv);
8800 case NFT_MSG_DELOBJ:
8801 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8803 case NFT_MSG_DELFLOWTABLE:
8804 if (nft_trans_flowtable_update(trans))
8805 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8807 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8812 put_net(trans->ctx.net);
8817 static void nf_tables_trans_destroy_work(struct work_struct *w)
8819 struct nft_trans *trans, *next;
8822 spin_lock(&nf_tables_destroy_list_lock);
8823 list_splice_init(&nf_tables_destroy_list, &head);
8824 spin_unlock(&nf_tables_destroy_list_lock);
8826 if (list_empty(&head))
8831 list_for_each_entry_safe(trans, next, &head, list) {
8832 list_del(&trans->list);
8833 nft_commit_release(trans);
8837 void nf_tables_trans_destroy_flush_work(void)
8839 flush_work(&trans_destroy_work);
8841 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8843 static bool nft_expr_reduce(struct nft_regs_track *track,
8844 const struct nft_expr *expr)
8849 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8851 const struct nft_expr *expr, *last;
8852 struct nft_regs_track track = {};
8853 unsigned int size, data_size;
8854 void *data, *data_boundary;
8855 struct nft_rule_dp *prule;
8856 struct nft_rule *rule;
8858 /* already handled or inactive chain? */
8859 if (chain->blob_next || !nft_is_active_next(net, chain))
8863 list_for_each_entry(rule, &chain->rules, list) {
8864 if (nft_is_active_next(net, rule)) {
8865 data_size += sizeof(*prule) + rule->dlen;
8866 if (data_size > INT_MAX)
8870 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
8872 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8873 if (!chain->blob_next)
8876 data = (void *)chain->blob_next->data;
8877 data_boundary = data + data_size;
8880 list_for_each_entry(rule, &chain->rules, list) {
8881 if (!nft_is_active_next(net, rule))
8884 prule = (struct nft_rule_dp *)data;
8885 data += offsetof(struct nft_rule_dp, data);
8886 if (WARN_ON_ONCE(data > data_boundary))
8890 track.last = nft_expr_last(rule);
8891 nft_rule_for_each_expr(expr, last, rule) {
8894 if (nft_expr_reduce(&track, expr)) {
8899 if (WARN_ON_ONCE(data + size + expr->ops->size > data_boundary))
8902 memcpy(data + size, expr, expr->ops->size);
8903 size += expr->ops->size;
8905 if (WARN_ON_ONCE(size >= 1 << 12))
8908 prule->handle = rule->handle;
8914 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8917 prule = (struct nft_rule_dp *)data;
8918 data += offsetof(struct nft_rule_dp, data);
8919 if (WARN_ON_ONCE(data > data_boundary))
8922 nft_last_rule(chain->blob_next, prule);
8927 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8929 struct nftables_pernet *nft_net = nft_pernet(net);
8930 struct nft_trans *trans, *next;
8932 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8933 struct nft_chain *chain = trans->ctx.chain;
8935 if (trans->msg_type == NFT_MSG_NEWRULE ||
8936 trans->msg_type == NFT_MSG_DELRULE) {
8937 kvfree(chain->blob_next);
8938 chain->blob_next = NULL;
8943 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8945 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8950 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8952 struct nft_rules_old *old;
8954 /* rcu_head is after end marker */
8955 old = (void *)blob + sizeof(*blob) + blob->size;
8958 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8961 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8963 struct nft_rule_blob *g0, *g1;
8966 next_genbit = nft_gencursor_next(net);
8968 g0 = rcu_dereference_protected(chain->blob_gen_0,
8969 lockdep_commit_lock_is_held(net));
8970 g1 = rcu_dereference_protected(chain->blob_gen_1,
8971 lockdep_commit_lock_is_held(net));
8973 /* No changes to this chain? */
8974 if (chain->blob_next == NULL) {
8975 /* chain had no change in last or next generation */
8979 * chain had no change in this generation; make sure next
8980 * one uses same rules as current generation.
8983 rcu_assign_pointer(chain->blob_gen_1, g0);
8984 nf_tables_commit_chain_free_rules_old(g1);
8986 rcu_assign_pointer(chain->blob_gen_0, g1);
8987 nf_tables_commit_chain_free_rules_old(g0);
8994 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8996 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8998 chain->blob_next = NULL;
9004 nf_tables_commit_chain_free_rules_old(g1);
9006 nf_tables_commit_chain_free_rules_old(g0);
9009 static void nft_obj_del(struct nft_object *obj)
9011 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
9012 list_del_rcu(&obj->list);
9015 void nft_chain_del(struct nft_chain *chain)
9017 struct nft_table *table = chain->table;
9019 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
9020 nft_chain_ht_params));
9021 list_del_rcu(&chain->list);
9024 static void nf_tables_module_autoload_cleanup(struct net *net)
9026 struct nftables_pernet *nft_net = nft_pernet(net);
9027 struct nft_module_request *req, *next;
9029 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
9030 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
9031 WARN_ON_ONCE(!req->done);
9032 list_del(&req->list);
9037 static void nf_tables_commit_release(struct net *net)
9039 struct nftables_pernet *nft_net = nft_pernet(net);
9040 struct nft_trans *trans;
9042 /* all side effects have to be made visible.
9043 * For example, if a chain named 'foo' has been deleted, a
9044 * new transaction must not find it anymore.
9046 * Memory reclaim happens asynchronously from work queue
9047 * to prevent expensive synchronize_rcu() in commit phase.
9049 if (list_empty(&nft_net->commit_list)) {
9050 nf_tables_module_autoload_cleanup(net);
9051 mutex_unlock(&nft_net->commit_mutex);
9055 trans = list_last_entry(&nft_net->commit_list,
9056 struct nft_trans, list);
9057 get_net(trans->ctx.net);
9058 WARN_ON_ONCE(trans->put_net);
9060 trans->put_net = true;
9061 spin_lock(&nf_tables_destroy_list_lock);
9062 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
9063 spin_unlock(&nf_tables_destroy_list_lock);
9065 nf_tables_module_autoload_cleanup(net);
9066 schedule_work(&trans_destroy_work);
9068 mutex_unlock(&nft_net->commit_mutex);
9071 static void nft_commit_notify(struct net *net, u32 portid)
9073 struct nftables_pernet *nft_net = nft_pernet(net);
9074 struct sk_buff *batch_skb = NULL, *nskb, *skb;
9075 unsigned char *data;
9078 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
9082 len = NLMSG_GOODSIZE - skb->len;
9083 list_del(&skb->list);
9087 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
9088 data = skb_put(batch_skb, skb->len);
9089 memcpy(data, skb->data, skb->len);
9090 list_del(&skb->list);
9094 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9095 NFT_CB(batch_skb).report, GFP_KERNEL);
9100 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
9101 NFT_CB(batch_skb).report, GFP_KERNEL);
9104 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9107 static int nf_tables_commit_audit_alloc(struct list_head *adl,
9108 struct nft_table *table)
9110 struct nft_audit_data *adp;
9112 list_for_each_entry(adp, adl, list) {
9113 if (adp->table == table)
9116 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
9120 list_add(&adp->list, adl);
9124 static void nf_tables_commit_audit_free(struct list_head *adl)
9126 struct nft_audit_data *adp, *adn;
9128 list_for_each_entry_safe(adp, adn, adl, list) {
9129 list_del(&adp->list);
9134 static void nf_tables_commit_audit_collect(struct list_head *adl,
9135 struct nft_table *table, u32 op)
9137 struct nft_audit_data *adp;
9139 list_for_each_entry(adp, adl, list) {
9140 if (adp->table == table)
9143 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
9147 if (!adp->op || adp->op > op)
9151 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
9153 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
9155 struct nft_audit_data *adp, *adn;
9156 char aubuf[AUNFTABLENAMELEN];
9158 list_for_each_entry_safe(adp, adn, adl, list) {
9159 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
9161 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
9162 nft2audit_op[adp->op], GFP_KERNEL);
9163 list_del(&adp->list);
9168 static void nft_set_commit_update(struct list_head *set_update_list)
9170 struct nft_set *set, *next;
9172 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9173 list_del_init(&set->pending_update);
9175 if (!set->ops->commit)
9178 set->ops->commit(set);
9182 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
9184 struct nftables_pernet *nft_net = nft_pernet(net);
9185 struct nft_trans *trans, *next;
9186 LIST_HEAD(set_update_list);
9187 struct nft_trans_elem *te;
9188 struct nft_chain *chain;
9189 struct nft_table *table;
9190 unsigned int base_seq;
9194 if (list_empty(&nft_net->commit_list)) {
9195 mutex_unlock(&nft_net->commit_mutex);
9199 /* 0. Validate ruleset, otherwise roll back for error reporting. */
9200 if (nf_tables_validate(net) < 0)
9203 err = nft_flow_rule_offload_commit(net);
9207 /* 1. Allocate space for next generation rules_gen_X[] */
9208 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9211 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
9213 nf_tables_commit_chain_prepare_cancel(net);
9214 nf_tables_commit_audit_free(&adl);
9217 if (trans->msg_type == NFT_MSG_NEWRULE ||
9218 trans->msg_type == NFT_MSG_DELRULE) {
9219 chain = trans->ctx.chain;
9221 ret = nf_tables_commit_chain_prepare(net, chain);
9223 nf_tables_commit_chain_prepare_cancel(net);
9224 nf_tables_commit_audit_free(&adl);
9230 /* step 2. Make rules_gen_X visible to packet path */
9231 list_for_each_entry(table, &nft_net->tables, list) {
9232 list_for_each_entry(chain, &table->chains, list)
9233 nf_tables_commit_chain(net, chain);
9237 * Bump generation counter, invalidate any dump in progress.
9238 * Cannot fail after this point.
9240 base_seq = READ_ONCE(nft_net->base_seq);
9241 while (++base_seq == 0)
9244 WRITE_ONCE(nft_net->base_seq, base_seq);
9246 /* step 3. Start new generation, rules_gen_X now in use. */
9247 net->nft.gencursor = nft_gencursor_next(net);
9249 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
9250 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
9252 switch (trans->msg_type) {
9253 case NFT_MSG_NEWTABLE:
9254 if (nft_trans_table_update(trans)) {
9255 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9256 nft_trans_destroy(trans);
9259 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
9260 nf_tables_table_disable(net, trans->ctx.table);
9262 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9264 nft_clear(net, trans->ctx.table);
9266 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
9267 nft_trans_destroy(trans);
9269 case NFT_MSG_DELTABLE:
9270 list_del_rcu(&trans->ctx.table->list);
9271 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
9273 case NFT_MSG_NEWCHAIN:
9274 if (nft_trans_chain_update(trans)) {
9275 nft_chain_commit_update(trans);
9276 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9277 /* trans destroyed after rcu grace period */
9279 nft_chain_commit_drop_policy(trans);
9280 nft_clear(net, trans->ctx.chain);
9281 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
9282 nft_trans_destroy(trans);
9285 case NFT_MSG_DELCHAIN:
9286 nft_chain_del(trans->ctx.chain);
9287 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
9288 nf_tables_unregister_hook(trans->ctx.net,
9292 case NFT_MSG_NEWRULE:
9293 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9294 nf_tables_rule_notify(&trans->ctx,
9295 nft_trans_rule(trans),
9297 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9298 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9300 nft_trans_destroy(trans);
9302 case NFT_MSG_DELRULE:
9303 list_del_rcu(&nft_trans_rule(trans)->list);
9304 nf_tables_rule_notify(&trans->ctx,
9305 nft_trans_rule(trans),
9307 nft_rule_expr_deactivate(&trans->ctx,
9308 nft_trans_rule(trans),
9311 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9312 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9314 case NFT_MSG_NEWSET:
9315 if (nft_trans_set_update(trans)) {
9316 struct nft_set *set = nft_trans_set(trans);
9318 WRITE_ONCE(set->timeout, nft_trans_set_timeout(trans));
9319 WRITE_ONCE(set->gc_int, nft_trans_set_gc_int(trans));
9321 nft_clear(net, nft_trans_set(trans));
9322 /* This avoids hitting -EBUSY when deleting the table
9323 * from the transaction.
9325 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
9326 !list_empty(&nft_trans_set(trans)->bindings))
9327 trans->ctx.table->use--;
9329 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9330 NFT_MSG_NEWSET, GFP_KERNEL);
9331 nft_trans_destroy(trans);
9333 case NFT_MSG_DELSET:
9334 list_del_rcu(&nft_trans_set(trans)->list);
9335 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
9336 NFT_MSG_DELSET, GFP_KERNEL);
9338 case NFT_MSG_NEWSETELEM:
9339 te = (struct nft_trans_elem *)trans->data;
9341 nft_setelem_activate(net, te->set, &te->elem);
9342 nf_tables_setelem_notify(&trans->ctx, te->set,
9344 NFT_MSG_NEWSETELEM);
9345 if (te->set->ops->commit &&
9346 list_empty(&te->set->pending_update)) {
9347 list_add_tail(&te->set->pending_update,
9350 nft_trans_destroy(trans);
9352 case NFT_MSG_DELSETELEM:
9353 te = (struct nft_trans_elem *)trans->data;
9355 nf_tables_setelem_notify(&trans->ctx, te->set,
9357 NFT_MSG_DELSETELEM);
9358 nft_setelem_remove(net, te->set, &te->elem);
9359 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9360 atomic_dec(&te->set->nelems);
9363 if (te->set->ops->commit &&
9364 list_empty(&te->set->pending_update)) {
9365 list_add_tail(&te->set->pending_update,
9369 case NFT_MSG_NEWOBJ:
9370 if (nft_trans_obj_update(trans)) {
9371 nft_obj_commit_update(trans);
9372 nf_tables_obj_notify(&trans->ctx,
9373 nft_trans_obj(trans),
9376 nft_clear(net, nft_trans_obj(trans));
9377 nf_tables_obj_notify(&trans->ctx,
9378 nft_trans_obj(trans),
9380 nft_trans_destroy(trans);
9383 case NFT_MSG_DELOBJ:
9384 nft_obj_del(nft_trans_obj(trans));
9385 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9388 case NFT_MSG_NEWFLOWTABLE:
9389 if (nft_trans_flowtable_update(trans)) {
9390 nft_trans_flowtable(trans)->data.flags =
9391 nft_trans_flowtable_flags(trans);
9392 nf_tables_flowtable_notify(&trans->ctx,
9393 nft_trans_flowtable(trans),
9394 &nft_trans_flowtable_hooks(trans),
9395 NFT_MSG_NEWFLOWTABLE);
9396 list_splice(&nft_trans_flowtable_hooks(trans),
9397 &nft_trans_flowtable(trans)->hook_list);
9399 nft_clear(net, nft_trans_flowtable(trans));
9400 nf_tables_flowtable_notify(&trans->ctx,
9401 nft_trans_flowtable(trans),
9402 &nft_trans_flowtable(trans)->hook_list,
9403 NFT_MSG_NEWFLOWTABLE);
9405 nft_trans_destroy(trans);
9407 case NFT_MSG_DELFLOWTABLE:
9408 if (nft_trans_flowtable_update(trans)) {
9409 nf_tables_flowtable_notify(&trans->ctx,
9410 nft_trans_flowtable(trans),
9411 &nft_trans_flowtable_hooks(trans),
9412 NFT_MSG_DELFLOWTABLE);
9413 nft_unregister_flowtable_net_hooks(net,
9414 &nft_trans_flowtable_hooks(trans));
9416 list_del_rcu(&nft_trans_flowtable(trans)->list);
9417 nf_tables_flowtable_notify(&trans->ctx,
9418 nft_trans_flowtable(trans),
9419 &nft_trans_flowtable(trans)->hook_list,
9420 NFT_MSG_DELFLOWTABLE);
9421 nft_unregister_flowtable_net_hooks(net,
9422 &nft_trans_flowtable(trans)->hook_list);
9428 nft_set_commit_update(&set_update_list);
9430 nft_commit_notify(net, NETLINK_CB(skb).portid);
9431 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9432 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9433 nf_tables_commit_release(net);
9438 static void nf_tables_module_autoload(struct net *net)
9440 struct nftables_pernet *nft_net = nft_pernet(net);
9441 struct nft_module_request *req, *next;
9442 LIST_HEAD(module_list);
9444 list_splice_init(&nft_net->module_list, &module_list);
9445 mutex_unlock(&nft_net->commit_mutex);
9446 list_for_each_entry_safe(req, next, &module_list, list) {
9447 request_module("%s", req->module);
9450 mutex_lock(&nft_net->commit_mutex);
9451 list_splice(&module_list, &nft_net->module_list);
9454 static void nf_tables_abort_release(struct nft_trans *trans)
9456 switch (trans->msg_type) {
9457 case NFT_MSG_NEWTABLE:
9458 nf_tables_table_destroy(&trans->ctx);
9460 case NFT_MSG_NEWCHAIN:
9461 nf_tables_chain_destroy(&trans->ctx);
9463 case NFT_MSG_NEWRULE:
9464 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9466 case NFT_MSG_NEWSET:
9467 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9469 case NFT_MSG_NEWSETELEM:
9470 nft_set_elem_destroy(nft_trans_elem_set(trans),
9471 nft_trans_elem(trans).priv, true);
9473 case NFT_MSG_NEWOBJ:
9474 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9476 case NFT_MSG_NEWFLOWTABLE:
9477 if (nft_trans_flowtable_update(trans))
9478 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9480 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9486 static void nft_set_abort_update(struct list_head *set_update_list)
9488 struct nft_set *set, *next;
9490 list_for_each_entry_safe(set, next, set_update_list, pending_update) {
9491 list_del_init(&set->pending_update);
9493 if (!set->ops->abort)
9496 set->ops->abort(set);
9500 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9502 struct nftables_pernet *nft_net = nft_pernet(net);
9503 struct nft_trans *trans, *next;
9504 LIST_HEAD(set_update_list);
9505 struct nft_trans_elem *te;
9507 if (action == NFNL_ABORT_VALIDATE &&
9508 nf_tables_validate(net) < 0)
9511 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9513 switch (trans->msg_type) {
9514 case NFT_MSG_NEWTABLE:
9515 if (nft_trans_table_update(trans)) {
9516 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9517 nft_trans_destroy(trans);
9520 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9521 nf_tables_table_disable(net, trans->ctx.table);
9522 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9523 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9524 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9526 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9527 nft_trans_destroy(trans);
9529 list_del_rcu(&trans->ctx.table->list);
9532 case NFT_MSG_DELTABLE:
9533 nft_clear(trans->ctx.net, trans->ctx.table);
9534 nft_trans_destroy(trans);
9536 case NFT_MSG_NEWCHAIN:
9537 if (nft_trans_chain_update(trans)) {
9538 free_percpu(nft_trans_chain_stats(trans));
9539 kfree(nft_trans_chain_name(trans));
9540 nft_trans_destroy(trans);
9542 if (nft_trans_chain_bound(trans)) {
9543 nft_trans_destroy(trans);
9546 trans->ctx.table->use--;
9547 nft_chain_del(trans->ctx.chain);
9548 nf_tables_unregister_hook(trans->ctx.net,
9553 case NFT_MSG_DELCHAIN:
9554 trans->ctx.table->use++;
9555 nft_clear(trans->ctx.net, trans->ctx.chain);
9556 nft_trans_destroy(trans);
9558 case NFT_MSG_NEWRULE:
9559 if (nft_trans_rule_bound(trans)) {
9560 nft_trans_destroy(trans);
9563 trans->ctx.chain->use--;
9564 list_del_rcu(&nft_trans_rule(trans)->list);
9565 nft_rule_expr_deactivate(&trans->ctx,
9566 nft_trans_rule(trans),
9568 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9569 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9571 case NFT_MSG_DELRULE:
9572 trans->ctx.chain->use++;
9573 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9574 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9575 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9576 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9578 nft_trans_destroy(trans);
9580 case NFT_MSG_NEWSET:
9581 if (nft_trans_set_update(trans)) {
9582 nft_trans_destroy(trans);
9585 trans->ctx.table->use--;
9586 if (nft_trans_set_bound(trans)) {
9587 nft_trans_destroy(trans);
9590 list_del_rcu(&nft_trans_set(trans)->list);
9592 case NFT_MSG_DELSET:
9593 trans->ctx.table->use++;
9594 nft_clear(trans->ctx.net, nft_trans_set(trans));
9595 if (nft_trans_set(trans)->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
9596 nft_map_activate(&trans->ctx, nft_trans_set(trans));
9598 nft_trans_destroy(trans);
9600 case NFT_MSG_NEWSETELEM:
9601 if (nft_trans_elem_set_bound(trans)) {
9602 nft_trans_destroy(trans);
9605 te = (struct nft_trans_elem *)trans->data;
9606 nft_setelem_remove(net, te->set, &te->elem);
9607 if (!nft_setelem_is_catchall(te->set, &te->elem))
9608 atomic_dec(&te->set->nelems);
9610 if (te->set->ops->abort &&
9611 list_empty(&te->set->pending_update)) {
9612 list_add_tail(&te->set->pending_update,
9616 case NFT_MSG_DELSETELEM:
9617 te = (struct nft_trans_elem *)trans->data;
9619 nft_setelem_data_activate(net, te->set, &te->elem);
9620 nft_setelem_activate(net, te->set, &te->elem);
9621 if (!nft_setelem_is_catchall(te->set, &te->elem))
9624 if (te->set->ops->abort &&
9625 list_empty(&te->set->pending_update)) {
9626 list_add_tail(&te->set->pending_update,
9629 nft_trans_destroy(trans);
9631 case NFT_MSG_NEWOBJ:
9632 if (nft_trans_obj_update(trans)) {
9633 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9634 nft_trans_destroy(trans);
9636 trans->ctx.table->use--;
9637 nft_obj_del(nft_trans_obj(trans));
9640 case NFT_MSG_DELOBJ:
9641 trans->ctx.table->use++;
9642 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9643 nft_trans_destroy(trans);
9645 case NFT_MSG_NEWFLOWTABLE:
9646 if (nft_trans_flowtable_update(trans)) {
9647 nft_unregister_flowtable_net_hooks(net,
9648 &nft_trans_flowtable_hooks(trans));
9650 trans->ctx.table->use--;
9651 list_del_rcu(&nft_trans_flowtable(trans)->list);
9652 nft_unregister_flowtable_net_hooks(net,
9653 &nft_trans_flowtable(trans)->hook_list);
9656 case NFT_MSG_DELFLOWTABLE:
9657 if (nft_trans_flowtable_update(trans)) {
9658 list_splice(&nft_trans_flowtable_hooks(trans),
9659 &nft_trans_flowtable(trans)->hook_list);
9661 trans->ctx.table->use++;
9662 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9664 nft_trans_destroy(trans);
9669 nft_set_abort_update(&set_update_list);
9673 list_for_each_entry_safe_reverse(trans, next,
9674 &nft_net->commit_list, list) {
9675 list_del(&trans->list);
9676 nf_tables_abort_release(trans);
9679 if (action == NFNL_ABORT_AUTOLOAD)
9680 nf_tables_module_autoload(net);
9682 nf_tables_module_autoload_cleanup(net);
9687 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9688 enum nfnl_abort_action action)
9690 struct nftables_pernet *nft_net = nft_pernet(net);
9691 int ret = __nf_tables_abort(net, action);
9693 mutex_unlock(&nft_net->commit_mutex);
9698 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9700 struct nftables_pernet *nft_net = nft_pernet(net);
9703 mutex_lock(&nft_net->commit_mutex);
9705 genid_ok = genid == 0 || nft_net->base_seq == genid;
9707 mutex_unlock(&nft_net->commit_mutex);
9709 /* else, commit mutex has to be released by commit or abort function */
9713 static const struct nfnetlink_subsystem nf_tables_subsys = {
9714 .name = "nf_tables",
9715 .subsys_id = NFNL_SUBSYS_NFTABLES,
9716 .cb_count = NFT_MSG_MAX,
9718 .commit = nf_tables_commit,
9719 .abort = nf_tables_abort,
9720 .valid_genid = nf_tables_valid_genid,
9721 .owner = THIS_MODULE,
9724 int nft_chain_validate_dependency(const struct nft_chain *chain,
9725 enum nft_chain_types type)
9727 const struct nft_base_chain *basechain;
9729 if (nft_is_base_chain(chain)) {
9730 basechain = nft_base_chain(chain);
9731 if (basechain->type->type != type)
9736 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9738 int nft_chain_validate_hooks(const struct nft_chain *chain,
9739 unsigned int hook_flags)
9741 struct nft_base_chain *basechain;
9743 if (nft_is_base_chain(chain)) {
9744 basechain = nft_base_chain(chain);
9746 if ((1 << basechain->ops.hooknum) & hook_flags)
9754 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9757 * Loop detection - walk through the ruleset beginning at the destination chain
9758 * of a new jump until either the source chain is reached (loop) or all
9759 * reachable chains have been traversed.
9761 * The loop check is performed whenever a new jump verdict is added to an
9762 * expression or verdict map or a verdict map is bound to a new chain.
9765 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9766 const struct nft_chain *chain);
9768 static int nft_check_loops(const struct nft_ctx *ctx,
9769 const struct nft_set_ext *ext)
9771 const struct nft_data *data;
9774 data = nft_set_ext_data(ext);
9775 switch (data->verdict.code) {
9778 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9788 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9789 struct nft_set *set,
9790 const struct nft_set_iter *iter,
9791 struct nft_set_elem *elem)
9793 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9795 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9796 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9799 return nft_check_loops(ctx, ext);
9802 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9803 struct nft_set *set)
9805 u8 genmask = nft_genmask_next(ctx->net);
9806 struct nft_set_elem_catchall *catchall;
9807 struct nft_set_ext *ext;
9810 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9811 ext = nft_set_elem_ext(set, catchall->elem);
9812 if (!nft_set_elem_active(ext, genmask))
9815 ret = nft_check_loops(ctx, ext);
9823 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9824 const struct nft_chain *chain)
9826 const struct nft_rule *rule;
9827 const struct nft_expr *expr, *last;
9828 struct nft_set *set;
9829 struct nft_set_binding *binding;
9830 struct nft_set_iter iter;
9832 if (ctx->chain == chain)
9835 list_for_each_entry(rule, &chain->rules, list) {
9836 nft_rule_for_each_expr(expr, last, rule) {
9837 struct nft_immediate_expr *priv;
9838 const struct nft_data *data;
9841 if (strcmp(expr->ops->type->name, "immediate"))
9844 priv = nft_expr_priv(expr);
9845 if (priv->dreg != NFT_REG_VERDICT)
9849 switch (data->verdict.code) {
9852 err = nf_tables_check_loops(ctx,
9853 data->verdict.chain);
9863 list_for_each_entry(set, &ctx->table->sets, list) {
9864 if (!nft_is_active_next(ctx->net, set))
9866 if (!(set->flags & NFT_SET_MAP) ||
9867 set->dtype != NFT_DATA_VERDICT)
9870 list_for_each_entry(binding, &set->bindings, list) {
9871 if (!(binding->flags & NFT_SET_MAP) ||
9872 binding->chain != chain)
9875 iter.genmask = nft_genmask_next(ctx->net);
9879 iter.fn = nf_tables_loop_check_setelem;
9881 set->ops->walk(ctx, set, &iter);
9883 iter.err = nft_set_catchall_loops(ctx, set);
9894 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9896 * @attr: netlink attribute to fetch value from
9897 * @max: maximum value to be stored in dest
9898 * @dest: pointer to the variable
9900 * Parse, check and store a given u32 netlink attribute into variable.
9901 * This function returns -ERANGE if the value goes over maximum value.
9902 * Otherwise a 0 is returned and the attribute value is stored in the
9903 * destination variable.
9905 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9909 val = ntohl(nla_get_be32(attr));
9916 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9918 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9922 reg = ntohl(nla_get_be32(attr));
9924 case NFT_REG_VERDICT...NFT_REG_4:
9925 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9927 case NFT_REG32_00...NFT_REG32_15:
9928 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9938 * nft_dump_register - dump a register value to a netlink attribute
9940 * @skb: socket buffer
9941 * @attr: attribute number
9942 * @reg: register number
9944 * Construct a netlink attribute containing the register number. For
9945 * compatibility reasons, register numbers being a multiple of 4 are
9946 * translated to the corresponding 128 bit register numbers.
9948 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9950 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9951 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9953 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9955 return nla_put_be32(skb, attr, htonl(reg));
9957 EXPORT_SYMBOL_GPL(nft_dump_register);
9959 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9961 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9965 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9971 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9976 err = nft_parse_register(attr, ®);
9980 err = nft_validate_register_load(reg, len);
9987 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9989 static int nft_validate_register_store(const struct nft_ctx *ctx,
9990 enum nft_registers reg,
9991 const struct nft_data *data,
9992 enum nft_data_types type,
9998 case NFT_REG_VERDICT:
9999 if (type != NFT_DATA_VERDICT)
10002 if (data != NULL &&
10003 (data->verdict.code == NFT_GOTO ||
10004 data->verdict.code == NFT_JUMP)) {
10005 err = nf_tables_check_loops(ctx, data->verdict.chain);
10012 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
10016 if (reg * NFT_REG32_SIZE + len >
10017 sizeof_field(struct nft_regs, data))
10020 if (data != NULL && type != NFT_DATA_VALUE)
10026 int nft_parse_register_store(const struct nft_ctx *ctx,
10027 const struct nlattr *attr, u8 *dreg,
10028 const struct nft_data *data,
10029 enum nft_data_types type, unsigned int len)
10034 err = nft_parse_register(attr, ®);
10038 err = nft_validate_register_store(ctx, reg, data, type, len);
10045 EXPORT_SYMBOL_GPL(nft_parse_register_store);
10047 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
10048 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
10049 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
10050 .len = NFT_CHAIN_MAXNAMELEN - 1 },
10051 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
10054 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
10055 struct nft_data_desc *desc, const struct nlattr *nla)
10057 u8 genmask = nft_genmask_next(ctx->net);
10058 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
10059 struct nft_chain *chain;
10062 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
10063 nft_verdict_policy, NULL);
10067 if (!tb[NFTA_VERDICT_CODE])
10069 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
10071 switch (data->verdict.code) {
10073 switch (data->verdict.code & NF_VERDICT_MASK) {
10088 if (tb[NFTA_VERDICT_CHAIN]) {
10089 chain = nft_chain_lookup(ctx->net, ctx->table,
10090 tb[NFTA_VERDICT_CHAIN],
10092 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
10093 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
10094 tb[NFTA_VERDICT_CHAIN_ID]);
10096 return PTR_ERR(chain);
10102 return PTR_ERR(chain);
10103 if (nft_is_base_chain(chain))
10104 return -EOPNOTSUPP;
10105 if (nft_chain_is_bound(chain))
10107 if (desc->flags & NFT_DATA_DESC_SETELEM &&
10108 chain->flags & NFT_CHAIN_BINDING)
10112 data->verdict.chain = chain;
10116 desc->len = sizeof(data->verdict);
10121 static void nft_verdict_uninit(const struct nft_data *data)
10123 struct nft_chain *chain;
10125 switch (data->verdict.code) {
10128 chain = data->verdict.chain;
10134 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
10136 struct nlattr *nest;
10138 nest = nla_nest_start_noflag(skb, type);
10140 goto nla_put_failure;
10142 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
10143 goto nla_put_failure;
10148 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
10150 goto nla_put_failure;
10152 nla_nest_end(skb, nest);
10159 static int nft_value_init(const struct nft_ctx *ctx,
10160 struct nft_data *data, struct nft_data_desc *desc,
10161 const struct nlattr *nla)
10165 len = nla_len(nla);
10168 if (len > desc->size)
10171 if (len != desc->len)
10177 nla_memcpy(data->data, nla, len);
10182 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
10185 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
10188 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
10189 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
10190 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
10194 * nft_data_init - parse nf_tables data netlink attributes
10196 * @ctx: context of the expression using the data
10197 * @data: destination struct nft_data
10198 * @desc: data description
10199 * @nla: netlink attribute containing data
10201 * Parse the netlink data attributes and initialize a struct nft_data.
10202 * The type and length of data are returned in the data description.
10204 * The caller can indicate that it only wants to accept data of type
10205 * NFT_DATA_VALUE by passing NULL for the ctx argument.
10207 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
10208 struct nft_data_desc *desc, const struct nlattr *nla)
10210 struct nlattr *tb[NFTA_DATA_MAX + 1];
10213 if (WARN_ON_ONCE(!desc->size))
10216 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
10217 nft_data_policy, NULL);
10221 if (tb[NFTA_DATA_VALUE]) {
10222 if (desc->type != NFT_DATA_VALUE)
10225 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
10226 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
10227 if (desc->type != NFT_DATA_VERDICT)
10230 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
10237 EXPORT_SYMBOL_GPL(nft_data_init);
10240 * nft_data_release - release a nft_data item
10242 * @data: struct nft_data to release
10243 * @type: type of data
10245 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
10246 * all others need to be released by calling this function.
10248 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
10250 if (type < NFT_DATA_VERDICT)
10253 case NFT_DATA_VERDICT:
10254 return nft_verdict_uninit(data);
10259 EXPORT_SYMBOL_GPL(nft_data_release);
10261 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
10262 enum nft_data_types type, unsigned int len)
10264 struct nlattr *nest;
10267 nest = nla_nest_start_noflag(skb, attr);
10272 case NFT_DATA_VALUE:
10273 err = nft_value_dump(skb, data, len);
10275 case NFT_DATA_VERDICT:
10276 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
10283 nla_nest_end(skb, nest);
10286 EXPORT_SYMBOL_GPL(nft_data_dump);
10288 int __nft_release_basechain(struct nft_ctx *ctx)
10290 struct nft_rule *rule, *nr;
10292 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
10295 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
10296 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
10297 list_del(&rule->list);
10299 nf_tables_rule_release(ctx, rule);
10301 nft_chain_del(ctx->chain);
10303 nf_tables_chain_destroy(ctx);
10307 EXPORT_SYMBOL_GPL(__nft_release_basechain);
10309 static void __nft_release_hook(struct net *net, struct nft_table *table)
10311 struct nft_flowtable *flowtable;
10312 struct nft_chain *chain;
10314 list_for_each_entry(chain, &table->chains, list)
10315 __nf_tables_unregister_hook(net, table, chain, true);
10316 list_for_each_entry(flowtable, &table->flowtables, list)
10317 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
10321 static void __nft_release_hooks(struct net *net)
10323 struct nftables_pernet *nft_net = nft_pernet(net);
10324 struct nft_table *table;
10326 list_for_each_entry(table, &nft_net->tables, list) {
10327 if (nft_table_has_owner(table))
10330 __nft_release_hook(net, table);
10334 static void __nft_release_table(struct net *net, struct nft_table *table)
10336 struct nft_flowtable *flowtable, *nf;
10337 struct nft_chain *chain, *nc;
10338 struct nft_object *obj, *ne;
10339 struct nft_rule *rule, *nr;
10340 struct nft_set *set, *ns;
10341 struct nft_ctx ctx = {
10343 .family = NFPROTO_NETDEV,
10346 ctx.family = table->family;
10348 list_for_each_entry(chain, &table->chains, list) {
10350 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
10351 list_del(&rule->list);
10353 nf_tables_rule_release(&ctx, rule);
10356 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
10357 list_del(&flowtable->list);
10359 nf_tables_flowtable_destroy(flowtable);
10361 list_for_each_entry_safe(set, ns, &table->sets, list) {
10362 list_del(&set->list);
10364 if (set->flags & (NFT_SET_MAP | NFT_SET_OBJECT))
10365 nft_map_deactivate(&ctx, set);
10367 nft_set_destroy(&ctx, set);
10369 list_for_each_entry_safe(obj, ne, &table->objects, list) {
10372 nft_obj_destroy(&ctx, obj);
10374 list_for_each_entry_safe(chain, nc, &table->chains, list) {
10376 nft_chain_del(chain);
10378 nf_tables_chain_destroy(&ctx);
10380 nf_tables_table_destroy(&ctx);
10383 static void __nft_release_tables(struct net *net)
10385 struct nftables_pernet *nft_net = nft_pernet(net);
10386 struct nft_table *table, *nt;
10388 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10389 if (nft_table_has_owner(table))
10392 list_del(&table->list);
10394 __nft_release_table(net, table);
10398 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10401 struct nft_table *table, *to_delete[8];
10402 struct nftables_pernet *nft_net;
10403 struct netlink_notify *n = ptr;
10404 struct net *net = n->net;
10405 unsigned int deleted;
10406 bool restart = false;
10408 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10409 return NOTIFY_DONE;
10411 nft_net = nft_pernet(net);
10413 mutex_lock(&nft_net->commit_mutex);
10414 if (!list_empty(&nf_tables_destroy_list))
10417 list_for_each_entry(table, &nft_net->tables, list) {
10418 if (nft_table_has_owner(table) &&
10419 n->portid == table->nlpid) {
10420 __nft_release_hook(net, table);
10421 list_del_rcu(&table->list);
10422 to_delete[deleted++] = table;
10423 if (deleted >= ARRAY_SIZE(to_delete))
10428 restart = deleted >= ARRAY_SIZE(to_delete);
10431 __nft_release_table(net, to_delete[--deleted]);
10436 mutex_unlock(&nft_net->commit_mutex);
10438 return NOTIFY_DONE;
10441 static struct notifier_block nft_nl_notifier = {
10442 .notifier_call = nft_rcv_nl_event,
10445 static int __net_init nf_tables_init_net(struct net *net)
10447 struct nftables_pernet *nft_net = nft_pernet(net);
10449 INIT_LIST_HEAD(&nft_net->tables);
10450 INIT_LIST_HEAD(&nft_net->commit_list);
10451 INIT_LIST_HEAD(&nft_net->module_list);
10452 INIT_LIST_HEAD(&nft_net->notify_list);
10453 mutex_init(&nft_net->commit_mutex);
10454 nft_net->base_seq = 1;
10455 nft_net->validate_state = NFT_VALIDATE_SKIP;
10460 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10462 struct nftables_pernet *nft_net = nft_pernet(net);
10464 mutex_lock(&nft_net->commit_mutex);
10465 __nft_release_hooks(net);
10466 mutex_unlock(&nft_net->commit_mutex);
10469 static void __net_exit nf_tables_exit_net(struct net *net)
10471 struct nftables_pernet *nft_net = nft_pernet(net);
10473 mutex_lock(&nft_net->commit_mutex);
10474 if (!list_empty(&nft_net->commit_list) ||
10475 !list_empty(&nft_net->module_list))
10476 __nf_tables_abort(net, NFNL_ABORT_NONE);
10477 __nft_release_tables(net);
10478 mutex_unlock(&nft_net->commit_mutex);
10479 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10480 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10481 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10484 static struct pernet_operations nf_tables_net_ops = {
10485 .init = nf_tables_init_net,
10486 .pre_exit = nf_tables_pre_exit_net,
10487 .exit = nf_tables_exit_net,
10488 .id = &nf_tables_net_id,
10489 .size = sizeof(struct nftables_pernet),
10492 static int __init nf_tables_module_init(void)
10496 err = register_pernet_subsys(&nf_tables_net_ops);
10500 err = nft_chain_filter_init();
10502 goto err_chain_filter;
10504 err = nf_tables_core_module_init();
10506 goto err_core_module;
10508 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10510 goto err_netdev_notifier;
10512 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10514 goto err_rht_objname;
10516 err = nft_offload_init();
10520 err = netlink_register_notifier(&nft_nl_notifier);
10522 goto err_netlink_notifier;
10525 err = nfnetlink_subsys_register(&nf_tables_subsys);
10527 goto err_nfnl_subsys;
10529 nft_chain_route_init();
10534 netlink_unregister_notifier(&nft_nl_notifier);
10535 err_netlink_notifier:
10536 nft_offload_exit();
10538 rhltable_destroy(&nft_objname_ht);
10540 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10541 err_netdev_notifier:
10542 nf_tables_core_module_exit();
10544 nft_chain_filter_fini();
10546 unregister_pernet_subsys(&nf_tables_net_ops);
10550 static void __exit nf_tables_module_exit(void)
10552 nfnetlink_subsys_unregister(&nf_tables_subsys);
10553 netlink_unregister_notifier(&nft_nl_notifier);
10554 nft_offload_exit();
10555 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10556 nft_chain_filter_fini();
10557 nft_chain_route_fini();
10558 unregister_pernet_subsys(&nf_tables_net_ops);
10559 cancel_work_sync(&trans_destroy_work);
10561 rhltable_destroy(&nft_objname_ht);
10562 nf_tables_core_module_exit();
10565 module_init(nf_tables_module_init);
10566 module_exit(nf_tables_module_exit);
10568 MODULE_LICENSE("GPL");
10569 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10570 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);