1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/skbuff.h>
12 #include <linux/netlink.h>
13 #include <linux/vmalloc.h>
14 #include <linux/rhashtable.h>
15 #include <linux/audit.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_flow_table.h>
20 #include <net/netfilter/nf_tables_core.h>
21 #include <net/netfilter/nf_tables.h>
22 #include <net/netfilter/nf_tables_offload.h>
23 #include <net/net_namespace.h>
26 #define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
28 unsigned int nf_tables_net_id __read_mostly;
30 static LIST_HEAD(nf_tables_expressions);
31 static LIST_HEAD(nf_tables_objects);
32 static LIST_HEAD(nf_tables_flowtables);
33 static LIST_HEAD(nf_tables_destroy_list);
34 static DEFINE_SPINLOCK(nf_tables_destroy_list_lock);
37 NFT_VALIDATE_SKIP = 0,
42 static struct rhltable nft_objname_ht;
44 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
45 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
46 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
48 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
49 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
50 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
52 static const struct rhashtable_params nft_chain_ht_params = {
53 .head_offset = offsetof(struct nft_chain, rhlhead),
54 .key_offset = offsetof(struct nft_chain, name),
55 .hashfn = nft_chain_hash,
56 .obj_hashfn = nft_chain_hash_obj,
57 .obj_cmpfn = nft_chain_hash_cmp,
58 .automatic_shrinking = true,
61 static const struct rhashtable_params nft_objname_ht_params = {
62 .head_offset = offsetof(struct nft_object, rhlhead),
63 .key_offset = offsetof(struct nft_object, key),
64 .hashfn = nft_objname_hash,
65 .obj_hashfn = nft_objname_hash_obj,
66 .obj_cmpfn = nft_objname_hash_cmp,
67 .automatic_shrinking = true,
70 struct nft_audit_data {
71 struct nft_table *table;
74 struct list_head list;
77 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
78 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
79 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
80 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
81 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
82 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
83 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
84 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
85 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
86 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
87 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
88 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
89 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
90 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
91 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
92 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
93 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
94 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
95 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
97 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
98 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
99 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
100 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
101 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
102 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
105 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
107 struct nftables_pernet *nft_net = nft_pernet(net);
109 switch (nft_net->validate_state) {
110 case NFT_VALIDATE_SKIP:
111 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
113 case NFT_VALIDATE_NEED:
115 case NFT_VALIDATE_DO:
116 if (new_validate_state == NFT_VALIDATE_NEED)
120 nft_net->validate_state = new_validate_state;
122 static void nf_tables_trans_destroy_work(struct work_struct *w);
123 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
125 static void nft_ctx_init(struct nft_ctx *ctx,
127 const struct sk_buff *skb,
128 const struct nlmsghdr *nlh,
130 struct nft_table *table,
131 struct nft_chain *chain,
132 const struct nlattr * const *nla)
135 ctx->family = family;
140 ctx->portid = NETLINK_CB(skb).portid;
141 ctx->report = nlmsg_report(nlh);
142 ctx->flags = nlh->nlmsg_flags;
143 ctx->seq = nlh->nlmsg_seq;
146 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
147 int msg_type, u32 size, gfp_t gfp)
149 struct nft_trans *trans;
151 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
155 INIT_LIST_HEAD(&trans->list);
156 trans->msg_type = msg_type;
162 static struct nft_trans *nft_trans_alloc(const struct nft_ctx *ctx,
163 int msg_type, u32 size)
165 return nft_trans_alloc_gfp(ctx, msg_type, size, GFP_KERNEL);
168 static void nft_trans_destroy(struct nft_trans *trans)
170 list_del(&trans->list);
174 static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
176 struct nftables_pernet *nft_net;
177 struct net *net = ctx->net;
178 struct nft_trans *trans;
180 if (!nft_set_is_anonymous(set))
183 nft_net = nft_pernet(net);
184 list_for_each_entry_reverse(trans, &nft_net->commit_list, list) {
185 switch (trans->msg_type) {
187 if (nft_trans_set(trans) == set)
188 nft_trans_set_bound(trans) = true;
190 case NFT_MSG_NEWSETELEM:
191 if (nft_trans_elem_set(trans) == set)
192 nft_trans_elem_set_bound(trans) = true;
198 static int nft_netdev_register_hooks(struct net *net,
199 struct list_head *hook_list)
201 struct nft_hook *hook;
205 list_for_each_entry(hook, hook_list, list) {
206 err = nf_register_net_hook(net, &hook->ops);
215 list_for_each_entry(hook, hook_list, list) {
219 nf_unregister_net_hook(net, &hook->ops);
224 static void nft_netdev_unregister_hooks(struct net *net,
225 struct list_head *hook_list,
228 struct nft_hook *hook, *next;
230 list_for_each_entry_safe(hook, next, hook_list, list) {
231 nf_unregister_net_hook(net, &hook->ops);
232 if (release_netdev) {
233 list_del(&hook->list);
234 kfree_rcu(hook, rcu);
239 static int nf_tables_register_hook(struct net *net,
240 const struct nft_table *table,
241 struct nft_chain *chain)
243 struct nft_base_chain *basechain;
244 const struct nf_hook_ops *ops;
246 if (table->flags & NFT_TABLE_F_DORMANT ||
247 !nft_is_base_chain(chain))
250 basechain = nft_base_chain(chain);
251 ops = &basechain->ops;
253 if (basechain->type->ops_register)
254 return basechain->type->ops_register(net, ops);
256 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
257 return nft_netdev_register_hooks(net, &basechain->hook_list);
259 return nf_register_net_hook(net, &basechain->ops);
262 static void __nf_tables_unregister_hook(struct net *net,
263 const struct nft_table *table,
264 struct nft_chain *chain,
267 struct nft_base_chain *basechain;
268 const struct nf_hook_ops *ops;
270 if (table->flags & NFT_TABLE_F_DORMANT ||
271 !nft_is_base_chain(chain))
273 basechain = nft_base_chain(chain);
274 ops = &basechain->ops;
276 if (basechain->type->ops_unregister)
277 return basechain->type->ops_unregister(net, ops);
279 if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
280 nft_netdev_unregister_hooks(net, &basechain->hook_list,
283 nf_unregister_net_hook(net, &basechain->ops);
286 static void nf_tables_unregister_hook(struct net *net,
287 const struct nft_table *table,
288 struct nft_chain *chain)
290 return __nf_tables_unregister_hook(net, table, chain, false);
293 static void nft_trans_commit_list_add_tail(struct net *net, struct nft_trans *trans)
295 struct nftables_pernet *nft_net = nft_pernet(net);
297 list_add_tail(&trans->list, &nft_net->commit_list);
300 static int nft_trans_table_add(struct nft_ctx *ctx, int msg_type)
302 struct nft_trans *trans;
304 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_table));
308 if (msg_type == NFT_MSG_NEWTABLE)
309 nft_activate_next(ctx->net, ctx->table);
311 nft_trans_commit_list_add_tail(ctx->net, trans);
315 static int nft_deltable(struct nft_ctx *ctx)
319 err = nft_trans_table_add(ctx, NFT_MSG_DELTABLE);
323 nft_deactivate_next(ctx->net, ctx->table);
327 static struct nft_trans *nft_trans_chain_add(struct nft_ctx *ctx, int msg_type)
329 struct nft_trans *trans;
331 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_chain));
333 return ERR_PTR(-ENOMEM);
335 if (msg_type == NFT_MSG_NEWCHAIN) {
336 nft_activate_next(ctx->net, ctx->chain);
338 if (ctx->nla[NFTA_CHAIN_ID]) {
339 nft_trans_chain_id(trans) =
340 ntohl(nla_get_be32(ctx->nla[NFTA_CHAIN_ID]));
344 nft_trans_commit_list_add_tail(ctx->net, trans);
348 static int nft_delchain(struct nft_ctx *ctx)
350 struct nft_trans *trans;
352 trans = nft_trans_chain_add(ctx, NFT_MSG_DELCHAIN);
354 return PTR_ERR(trans);
357 nft_deactivate_next(ctx->net, ctx->chain);
362 static void nft_rule_expr_activate(const struct nft_ctx *ctx,
363 struct nft_rule *rule)
365 struct nft_expr *expr;
367 expr = nft_expr_first(rule);
368 while (nft_expr_more(rule, expr)) {
369 if (expr->ops->activate)
370 expr->ops->activate(ctx, expr);
372 expr = nft_expr_next(expr);
376 static void nft_rule_expr_deactivate(const struct nft_ctx *ctx,
377 struct nft_rule *rule,
378 enum nft_trans_phase phase)
380 struct nft_expr *expr;
382 expr = nft_expr_first(rule);
383 while (nft_expr_more(rule, expr)) {
384 if (expr->ops->deactivate)
385 expr->ops->deactivate(ctx, expr, phase);
387 expr = nft_expr_next(expr);
392 nf_tables_delrule_deactivate(struct nft_ctx *ctx, struct nft_rule *rule)
394 /* You cannot delete the same rule twice */
395 if (nft_is_active_next(ctx->net, rule)) {
396 nft_deactivate_next(ctx->net, rule);
403 static struct nft_trans *nft_trans_rule_add(struct nft_ctx *ctx, int msg_type,
404 struct nft_rule *rule)
406 struct nft_trans *trans;
408 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_rule));
412 if (msg_type == NFT_MSG_NEWRULE && ctx->nla[NFTA_RULE_ID] != NULL) {
413 nft_trans_rule_id(trans) =
414 ntohl(nla_get_be32(ctx->nla[NFTA_RULE_ID]));
416 nft_trans_rule(trans) = rule;
417 nft_trans_commit_list_add_tail(ctx->net, trans);
422 static int nft_delrule(struct nft_ctx *ctx, struct nft_rule *rule)
424 struct nft_flow_rule *flow;
425 struct nft_trans *trans;
428 trans = nft_trans_rule_add(ctx, NFT_MSG_DELRULE, rule);
432 if (ctx->chain->flags & NFT_CHAIN_HW_OFFLOAD) {
433 flow = nft_flow_rule_create(ctx->net, rule);
435 nft_trans_destroy(trans);
436 return PTR_ERR(flow);
439 nft_trans_flow_rule(trans) = flow;
442 err = nf_tables_delrule_deactivate(ctx, rule);
444 nft_trans_destroy(trans);
447 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_PREPARE);
452 static int nft_delrule_by_chain(struct nft_ctx *ctx)
454 struct nft_rule *rule;
457 list_for_each_entry(rule, &ctx->chain->rules, list) {
458 if (!nft_is_active_next(ctx->net, rule))
461 err = nft_delrule(ctx, rule);
468 static int nft_trans_set_add(const struct nft_ctx *ctx, int msg_type,
471 struct nft_trans *trans;
473 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_set));
477 if (msg_type == NFT_MSG_NEWSET && ctx->nla[NFTA_SET_ID] != NULL) {
478 nft_trans_set_id(trans) =
479 ntohl(nla_get_be32(ctx->nla[NFTA_SET_ID]));
480 nft_activate_next(ctx->net, set);
482 nft_trans_set(trans) = set;
483 nft_trans_commit_list_add_tail(ctx->net, trans);
488 static int nft_delset(const struct nft_ctx *ctx, struct nft_set *set)
492 err = nft_trans_set_add(ctx, NFT_MSG_DELSET, set);
496 nft_deactivate_next(ctx->net, set);
502 static int nft_trans_obj_add(struct nft_ctx *ctx, int msg_type,
503 struct nft_object *obj)
505 struct nft_trans *trans;
507 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_obj));
511 if (msg_type == NFT_MSG_NEWOBJ)
512 nft_activate_next(ctx->net, obj);
514 nft_trans_obj(trans) = obj;
515 nft_trans_commit_list_add_tail(ctx->net, trans);
520 static int nft_delobj(struct nft_ctx *ctx, struct nft_object *obj)
524 err = nft_trans_obj_add(ctx, NFT_MSG_DELOBJ, obj);
528 nft_deactivate_next(ctx->net, obj);
534 static int nft_trans_flowtable_add(struct nft_ctx *ctx, int msg_type,
535 struct nft_flowtable *flowtable)
537 struct nft_trans *trans;
539 trans = nft_trans_alloc(ctx, msg_type,
540 sizeof(struct nft_trans_flowtable));
544 if (msg_type == NFT_MSG_NEWFLOWTABLE)
545 nft_activate_next(ctx->net, flowtable);
547 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
548 nft_trans_flowtable(trans) = flowtable;
549 nft_trans_commit_list_add_tail(ctx->net, trans);
554 static int nft_delflowtable(struct nft_ctx *ctx,
555 struct nft_flowtable *flowtable)
559 err = nft_trans_flowtable_add(ctx, NFT_MSG_DELFLOWTABLE, flowtable);
563 nft_deactivate_next(ctx->net, flowtable);
569 static void __nft_reg_track_clobber(struct nft_regs_track *track, u8 dreg)
573 for (i = track->regs[dreg].num_reg; i > 0; i--)
574 __nft_reg_track_cancel(track, dreg - i);
577 static void __nft_reg_track_update(struct nft_regs_track *track,
578 const struct nft_expr *expr,
581 track->regs[dreg].selector = expr;
582 track->regs[dreg].bitwise = NULL;
583 track->regs[dreg].num_reg = num_reg;
586 void nft_reg_track_update(struct nft_regs_track *track,
587 const struct nft_expr *expr, u8 dreg, u8 len)
589 unsigned int regcount;
592 __nft_reg_track_clobber(track, dreg);
594 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
595 for (i = 0; i < regcount; i++, dreg++)
596 __nft_reg_track_update(track, expr, dreg, i);
598 EXPORT_SYMBOL_GPL(nft_reg_track_update);
600 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len)
602 unsigned int regcount;
605 __nft_reg_track_clobber(track, dreg);
607 regcount = DIV_ROUND_UP(len, NFT_REG32_SIZE);
608 for (i = 0; i < regcount; i++, dreg++)
609 __nft_reg_track_cancel(track, dreg);
611 EXPORT_SYMBOL_GPL(nft_reg_track_cancel);
613 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg)
615 track->regs[dreg].selector = NULL;
616 track->regs[dreg].bitwise = NULL;
617 track->regs[dreg].num_reg = 0;
619 EXPORT_SYMBOL_GPL(__nft_reg_track_cancel);
625 static struct nft_table *nft_table_lookup(const struct net *net,
626 const struct nlattr *nla,
627 u8 family, u8 genmask, u32 nlpid)
629 struct nftables_pernet *nft_net;
630 struct nft_table *table;
633 return ERR_PTR(-EINVAL);
635 nft_net = nft_pernet(net);
636 list_for_each_entry_rcu(table, &nft_net->tables, list,
637 lockdep_is_held(&nft_net->commit_mutex)) {
638 if (!nla_strcmp(nla, table->name) &&
639 table->family == family &&
640 nft_active_genmask(table, genmask)) {
641 if (nft_table_has_owner(table) &&
642 nlpid && table->nlpid != nlpid)
643 return ERR_PTR(-EPERM);
649 return ERR_PTR(-ENOENT);
652 static struct nft_table *nft_table_lookup_byhandle(const struct net *net,
653 const struct nlattr *nla,
654 u8 genmask, u32 nlpid)
656 struct nftables_pernet *nft_net;
657 struct nft_table *table;
659 nft_net = nft_pernet(net);
660 list_for_each_entry(table, &nft_net->tables, list) {
661 if (be64_to_cpu(nla_get_be64(nla)) == table->handle &&
662 nft_active_genmask(table, genmask)) {
663 if (nft_table_has_owner(table) &&
664 nlpid && table->nlpid != nlpid)
665 return ERR_PTR(-EPERM);
671 return ERR_PTR(-ENOENT);
674 static inline u64 nf_tables_alloc_handle(struct nft_table *table)
676 return ++table->hgenerator;
679 static const struct nft_chain_type *chain_type[NFPROTO_NUMPROTO][NFT_CHAIN_T_MAX];
681 static const struct nft_chain_type *
682 __nft_chain_type_get(u8 family, enum nft_chain_types type)
684 if (family >= NFPROTO_NUMPROTO ||
685 type >= NFT_CHAIN_T_MAX)
688 return chain_type[family][type];
691 static const struct nft_chain_type *
692 __nf_tables_chain_type_lookup(const struct nlattr *nla, u8 family)
694 const struct nft_chain_type *type;
697 for (i = 0; i < NFT_CHAIN_T_MAX; i++) {
698 type = __nft_chain_type_get(family, i);
701 if (!nla_strcmp(nla, type->name))
707 struct nft_module_request {
708 struct list_head list;
709 char module[MODULE_NAME_LEN];
713 #ifdef CONFIG_MODULES
714 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
717 char module_name[MODULE_NAME_LEN];
718 struct nftables_pernet *nft_net;
719 struct nft_module_request *req;
724 ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
726 if (ret >= MODULE_NAME_LEN)
729 nft_net = nft_pernet(net);
730 list_for_each_entry(req, &nft_net->module_list, list) {
731 if (!strcmp(req->module, module_name)) {
735 /* A request to load this module already exists. */
740 req = kmalloc(sizeof(*req), GFP_KERNEL);
745 strscpy(req->module, module_name, MODULE_NAME_LEN);
746 list_add_tail(&req->list, &nft_net->module_list);
750 EXPORT_SYMBOL_GPL(nft_request_module);
753 static void lockdep_nfnl_nft_mutex_not_held(void)
755 #ifdef CONFIG_PROVE_LOCKING
757 WARN_ON_ONCE(lockdep_nfnl_is_held(NFNL_SUBSYS_NFTABLES));
761 static const struct nft_chain_type *
762 nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
763 u8 family, bool autoload)
765 const struct nft_chain_type *type;
767 type = __nf_tables_chain_type_lookup(nla, family);
771 lockdep_nfnl_nft_mutex_not_held();
772 #ifdef CONFIG_MODULES
774 if (nft_request_module(net, "nft-chain-%u-%.*s", family,
776 (const char *)nla_data(nla)) == -EAGAIN)
777 return ERR_PTR(-EAGAIN);
780 return ERR_PTR(-ENOENT);
783 static __be16 nft_base_seq(const struct net *net)
785 struct nftables_pernet *nft_net = nft_pernet(net);
787 return htons(nft_net->base_seq & 0xffff);
790 static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
791 [NFTA_TABLE_NAME] = { .type = NLA_STRING,
792 .len = NFT_TABLE_MAXNAMELEN - 1 },
793 [NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
794 [NFTA_TABLE_HANDLE] = { .type = NLA_U64 },
795 [NFTA_TABLE_USERDATA] = { .type = NLA_BINARY,
796 .len = NFT_USERDATA_MAXLEN }
799 static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
800 u32 portid, u32 seq, int event, u32 flags,
801 int family, const struct nft_table *table)
803 struct nlmsghdr *nlh;
805 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
806 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
807 NFNETLINK_V0, nft_base_seq(net));
809 goto nla_put_failure;
811 if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
812 nla_put_be32(skb, NFTA_TABLE_FLAGS,
813 htonl(table->flags & NFT_TABLE_F_MASK)) ||
814 nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)) ||
815 nla_put_be64(skb, NFTA_TABLE_HANDLE, cpu_to_be64(table->handle),
817 goto nla_put_failure;
818 if (nft_table_has_owner(table) &&
819 nla_put_be32(skb, NFTA_TABLE_OWNER, htonl(table->nlpid)))
820 goto nla_put_failure;
823 if (nla_put(skb, NFTA_TABLE_USERDATA, table->udlen, table->udata))
824 goto nla_put_failure;
831 nlmsg_trim(skb, nlh);
835 struct nftnl_skb_parms {
838 #define NFT_CB(skb) (*(struct nftnl_skb_parms*)&((skb)->cb))
840 static void nft_notify_enqueue(struct sk_buff *skb, bool report,
841 struct list_head *notify_list)
843 NFT_CB(skb).report = report;
844 list_add_tail(&skb->list, notify_list);
847 static void nf_tables_table_notify(const struct nft_ctx *ctx, int event)
849 struct nftables_pernet *nft_net;
855 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
858 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
862 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
863 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
865 err = nf_tables_fill_table_info(skb, ctx->net, ctx->portid, ctx->seq,
866 event, flags, ctx->family, ctx->table);
872 nft_net = nft_pernet(ctx->net);
873 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
876 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
879 static int nf_tables_dump_tables(struct sk_buff *skb,
880 struct netlink_callback *cb)
882 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
883 struct nftables_pernet *nft_net;
884 const struct nft_table *table;
885 unsigned int idx = 0, s_idx = cb->args[0];
886 struct net *net = sock_net(skb->sk);
887 int family = nfmsg->nfgen_family;
890 nft_net = nft_pernet(net);
891 cb->seq = READ_ONCE(nft_net->base_seq);
893 list_for_each_entry_rcu(table, &nft_net->tables, list) {
894 if (family != NFPROTO_UNSPEC && family != table->family)
900 memset(&cb->args[1], 0,
901 sizeof(cb->args) - sizeof(cb->args[0]));
902 if (!nft_is_active(net, table))
904 if (nf_tables_fill_table_info(skb, net,
905 NETLINK_CB(cb->skb).portid,
907 NFT_MSG_NEWTABLE, NLM_F_MULTI,
908 table->family, table) < 0)
911 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
921 static int nft_netlink_dump_start_rcu(struct sock *nlsk, struct sk_buff *skb,
922 const struct nlmsghdr *nlh,
923 struct netlink_dump_control *c)
927 if (!try_module_get(THIS_MODULE))
931 err = netlink_dump_start(nlsk, skb, nlh, c);
933 module_put(THIS_MODULE);
938 /* called with rcu_read_lock held */
939 static int nf_tables_gettable(struct sk_buff *skb, const struct nfnl_info *info,
940 const struct nlattr * const nla[])
942 struct netlink_ext_ack *extack = info->extack;
943 u8 genmask = nft_genmask_cur(info->net);
944 u8 family = info->nfmsg->nfgen_family;
945 const struct nft_table *table;
946 struct net *net = info->net;
947 struct sk_buff *skb2;
950 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
951 struct netlink_dump_control c = {
952 .dump = nf_tables_dump_tables,
953 .module = THIS_MODULE,
956 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
959 table = nft_table_lookup(net, nla[NFTA_TABLE_NAME], family, genmask, 0);
961 NL_SET_BAD_ATTR(extack, nla[NFTA_TABLE_NAME]);
962 return PTR_ERR(table);
965 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
969 err = nf_tables_fill_table_info(skb2, net, NETLINK_CB(skb).portid,
970 info->nlh->nlmsg_seq, NFT_MSG_NEWTABLE,
973 goto err_fill_table_info;
975 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
982 static void nft_table_disable(struct net *net, struct nft_table *table, u32 cnt)
984 struct nft_chain *chain;
987 list_for_each_entry(chain, &table->chains, list) {
988 if (!nft_is_active_next(net, chain))
990 if (!nft_is_base_chain(chain))
993 if (cnt && i++ == cnt)
996 nf_tables_unregister_hook(net, table, chain);
1000 static int nf_tables_table_enable(struct net *net, struct nft_table *table)
1002 struct nft_chain *chain;
1005 list_for_each_entry(chain, &table->chains, list) {
1006 if (!nft_is_active_next(net, chain))
1008 if (!nft_is_base_chain(chain))
1011 err = nf_tables_register_hook(net, table, chain);
1013 goto err_register_hooks;
1021 nft_table_disable(net, table, i);
1025 static void nf_tables_table_disable(struct net *net, struct nft_table *table)
1027 table->flags &= ~NFT_TABLE_F_DORMANT;
1028 nft_table_disable(net, table, 0);
1029 table->flags |= NFT_TABLE_F_DORMANT;
1032 #define __NFT_TABLE_F_INTERNAL (NFT_TABLE_F_MASK + 1)
1033 #define __NFT_TABLE_F_WAS_DORMANT (__NFT_TABLE_F_INTERNAL << 0)
1034 #define __NFT_TABLE_F_WAS_AWAKEN (__NFT_TABLE_F_INTERNAL << 1)
1035 #define __NFT_TABLE_F_UPDATE (__NFT_TABLE_F_WAS_DORMANT | \
1036 __NFT_TABLE_F_WAS_AWAKEN)
1038 static int nf_tables_updtable(struct nft_ctx *ctx)
1040 struct nft_trans *trans;
1044 if (!ctx->nla[NFTA_TABLE_FLAGS])
1047 flags = ntohl(nla_get_be32(ctx->nla[NFTA_TABLE_FLAGS]));
1048 if (flags & ~NFT_TABLE_F_MASK)
1051 if (flags == ctx->table->flags)
1054 if ((nft_table_has_owner(ctx->table) &&
1055 !(flags & NFT_TABLE_F_OWNER)) ||
1056 (!nft_table_has_owner(ctx->table) &&
1057 flags & NFT_TABLE_F_OWNER))
1060 trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
1061 sizeof(struct nft_trans_table));
1065 if ((flags & NFT_TABLE_F_DORMANT) &&
1066 !(ctx->table->flags & NFT_TABLE_F_DORMANT)) {
1067 ctx->table->flags |= NFT_TABLE_F_DORMANT;
1068 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE))
1069 ctx->table->flags |= __NFT_TABLE_F_WAS_AWAKEN;
1070 } else if (!(flags & NFT_TABLE_F_DORMANT) &&
1071 ctx->table->flags & NFT_TABLE_F_DORMANT) {
1072 ctx->table->flags &= ~NFT_TABLE_F_DORMANT;
1073 if (!(ctx->table->flags & __NFT_TABLE_F_UPDATE)) {
1074 ret = nf_tables_table_enable(ctx->net, ctx->table);
1076 goto err_register_hooks;
1078 ctx->table->flags |= __NFT_TABLE_F_WAS_DORMANT;
1082 nft_trans_table_update(trans) = true;
1083 nft_trans_commit_list_add_tail(ctx->net, trans);
1088 nft_trans_destroy(trans);
1092 static u32 nft_chain_hash(const void *data, u32 len, u32 seed)
1094 const char *name = data;
1096 return jhash(name, strlen(name), seed);
1099 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed)
1101 const struct nft_chain *chain = data;
1103 return nft_chain_hash(chain->name, 0, seed);
1106 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *arg,
1109 const struct nft_chain *chain = ptr;
1110 const char *name = arg->key;
1112 return strcmp(chain->name, name);
1115 static u32 nft_objname_hash(const void *data, u32 len, u32 seed)
1117 const struct nft_object_hash_key *k = data;
1119 seed ^= hash_ptr(k->table, 32);
1121 return jhash(k->name, strlen(k->name), seed);
1124 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed)
1126 const struct nft_object *obj = data;
1128 return nft_objname_hash(&obj->key, 0, seed);
1131 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *arg,
1134 const struct nft_object_hash_key *k = arg->key;
1135 const struct nft_object *obj = ptr;
1137 if (obj->key.table != k->table)
1140 return strcmp(obj->key.name, k->name);
1143 static bool nft_supported_family(u8 family)
1146 #ifdef CONFIG_NF_TABLES_INET
1147 || family == NFPROTO_INET
1149 #ifdef CONFIG_NF_TABLES_IPV4
1150 || family == NFPROTO_IPV4
1152 #ifdef CONFIG_NF_TABLES_ARP
1153 || family == NFPROTO_ARP
1155 #ifdef CONFIG_NF_TABLES_NETDEV
1156 || family == NFPROTO_NETDEV
1158 #if IS_ENABLED(CONFIG_NF_TABLES_BRIDGE)
1159 || family == NFPROTO_BRIDGE
1161 #ifdef CONFIG_NF_TABLES_IPV6
1162 || family == NFPROTO_IPV6
1167 static int nf_tables_newtable(struct sk_buff *skb, const struct nfnl_info *info,
1168 const struct nlattr * const nla[])
1170 struct nftables_pernet *nft_net = nft_pernet(info->net);
1171 struct netlink_ext_ack *extack = info->extack;
1172 u8 genmask = nft_genmask_next(info->net);
1173 u8 family = info->nfmsg->nfgen_family;
1174 struct net *net = info->net;
1175 const struct nlattr *attr;
1176 struct nft_table *table;
1181 if (!nft_supported_family(family))
1184 lockdep_assert_held(&nft_net->commit_mutex);
1185 attr = nla[NFTA_TABLE_NAME];
1186 table = nft_table_lookup(net, attr, family, genmask,
1187 NETLINK_CB(skb).portid);
1188 if (IS_ERR(table)) {
1189 if (PTR_ERR(table) != -ENOENT)
1190 return PTR_ERR(table);
1192 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
1193 NL_SET_BAD_ATTR(extack, attr);
1196 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
1199 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1201 return nf_tables_updtable(&ctx);
1204 if (nla[NFTA_TABLE_FLAGS]) {
1205 flags = ntohl(nla_get_be32(nla[NFTA_TABLE_FLAGS]));
1206 if (flags & ~NFT_TABLE_F_MASK)
1211 table = kzalloc(sizeof(*table), GFP_KERNEL_ACCOUNT);
1215 table->name = nla_strdup(attr, GFP_KERNEL_ACCOUNT);
1216 if (table->name == NULL)
1219 if (nla[NFTA_TABLE_USERDATA]) {
1220 table->udata = nla_memdup(nla[NFTA_TABLE_USERDATA], GFP_KERNEL_ACCOUNT);
1221 if (table->udata == NULL)
1222 goto err_table_udata;
1224 table->udlen = nla_len(nla[NFTA_TABLE_USERDATA]);
1227 err = rhltable_init(&table->chains_ht, &nft_chain_ht_params);
1231 INIT_LIST_HEAD(&table->chains);
1232 INIT_LIST_HEAD(&table->sets);
1233 INIT_LIST_HEAD(&table->objects);
1234 INIT_LIST_HEAD(&table->flowtables);
1235 table->family = family;
1236 table->flags = flags;
1237 table->handle = ++nft_net->table_handle;
1238 if (table->flags & NFT_TABLE_F_OWNER)
1239 table->nlpid = NETLINK_CB(skb).portid;
1241 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
1242 err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
1246 list_add_tail_rcu(&table->list, &nft_net->tables);
1249 rhltable_destroy(&table->chains_ht);
1251 kfree(table->udata);
1260 static int nft_flush_table(struct nft_ctx *ctx)
1262 struct nft_flowtable *flowtable, *nft;
1263 struct nft_chain *chain, *nc;
1264 struct nft_object *obj, *ne;
1265 struct nft_set *set, *ns;
1268 list_for_each_entry(chain, &ctx->table->chains, list) {
1269 if (!nft_is_active_next(ctx->net, chain))
1272 if (nft_chain_is_bound(chain))
1277 err = nft_delrule_by_chain(ctx);
1282 list_for_each_entry_safe(set, ns, &ctx->table->sets, list) {
1283 if (!nft_is_active_next(ctx->net, set))
1286 if (nft_set_is_anonymous(set) &&
1287 !list_empty(&set->bindings))
1290 err = nft_delset(ctx, set);
1295 list_for_each_entry_safe(flowtable, nft, &ctx->table->flowtables, list) {
1296 if (!nft_is_active_next(ctx->net, flowtable))
1299 err = nft_delflowtable(ctx, flowtable);
1304 list_for_each_entry_safe(obj, ne, &ctx->table->objects, list) {
1305 if (!nft_is_active_next(ctx->net, obj))
1308 err = nft_delobj(ctx, obj);
1313 list_for_each_entry_safe(chain, nc, &ctx->table->chains, list) {
1314 if (!nft_is_active_next(ctx->net, chain))
1317 if (nft_chain_is_bound(chain))
1322 err = nft_delchain(ctx);
1327 err = nft_deltable(ctx);
1332 static int nft_flush(struct nft_ctx *ctx, int family)
1334 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
1335 const struct nlattr * const *nla = ctx->nla;
1336 struct nft_table *table, *nt;
1339 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
1340 if (family != AF_UNSPEC && table->family != family)
1343 ctx->family = table->family;
1345 if (!nft_is_active_next(ctx->net, table))
1348 if (nft_table_has_owner(table) && table->nlpid != ctx->portid)
1351 if (nla[NFTA_TABLE_NAME] &&
1352 nla_strcmp(nla[NFTA_TABLE_NAME], table->name) != 0)
1357 err = nft_flush_table(ctx);
1365 static int nf_tables_deltable(struct sk_buff *skb, const struct nfnl_info *info,
1366 const struct nlattr * const nla[])
1368 struct netlink_ext_ack *extack = info->extack;
1369 u8 genmask = nft_genmask_next(info->net);
1370 u8 family = info->nfmsg->nfgen_family;
1371 struct net *net = info->net;
1372 const struct nlattr *attr;
1373 struct nft_table *table;
1376 nft_ctx_init(&ctx, net, skb, info->nlh, 0, NULL, NULL, nla);
1377 if (family == AF_UNSPEC ||
1378 (!nla[NFTA_TABLE_NAME] && !nla[NFTA_TABLE_HANDLE]))
1379 return nft_flush(&ctx, family);
1381 if (nla[NFTA_TABLE_HANDLE]) {
1382 attr = nla[NFTA_TABLE_HANDLE];
1383 table = nft_table_lookup_byhandle(net, attr, genmask,
1384 NETLINK_CB(skb).portid);
1386 attr = nla[NFTA_TABLE_NAME];
1387 table = nft_table_lookup(net, attr, family, genmask,
1388 NETLINK_CB(skb).portid);
1391 if (IS_ERR(table)) {
1392 NL_SET_BAD_ATTR(extack, attr);
1393 return PTR_ERR(table);
1396 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
1400 ctx.family = family;
1403 return nft_flush_table(&ctx);
1406 static void nf_tables_table_destroy(struct nft_ctx *ctx)
1408 if (WARN_ON(ctx->table->use > 0))
1411 rhltable_destroy(&ctx->table->chains_ht);
1412 kfree(ctx->table->name);
1413 kfree(ctx->table->udata);
1417 void nft_register_chain_type(const struct nft_chain_type *ctype)
1419 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1420 if (WARN_ON(__nft_chain_type_get(ctype->family, ctype->type))) {
1421 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1424 chain_type[ctype->family][ctype->type] = ctype;
1425 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1427 EXPORT_SYMBOL_GPL(nft_register_chain_type);
1429 void nft_unregister_chain_type(const struct nft_chain_type *ctype)
1431 nfnl_lock(NFNL_SUBSYS_NFTABLES);
1432 chain_type[ctype->family][ctype->type] = NULL;
1433 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
1435 EXPORT_SYMBOL_GPL(nft_unregister_chain_type);
1441 static struct nft_chain *
1442 nft_chain_lookup_byhandle(const struct nft_table *table, u64 handle, u8 genmask)
1444 struct nft_chain *chain;
1446 list_for_each_entry(chain, &table->chains, list) {
1447 if (chain->handle == handle &&
1448 nft_active_genmask(chain, genmask))
1452 return ERR_PTR(-ENOENT);
1455 static bool lockdep_commit_lock_is_held(const struct net *net)
1457 #ifdef CONFIG_PROVE_LOCKING
1458 struct nftables_pernet *nft_net = nft_pernet(net);
1460 return lockdep_is_held(&nft_net->commit_mutex);
1466 static struct nft_chain *nft_chain_lookup(struct net *net,
1467 struct nft_table *table,
1468 const struct nlattr *nla, u8 genmask)
1470 char search[NFT_CHAIN_MAXNAMELEN + 1];
1471 struct rhlist_head *tmp, *list;
1472 struct nft_chain *chain;
1475 return ERR_PTR(-EINVAL);
1477 nla_strscpy(search, nla, sizeof(search));
1479 WARN_ON(!rcu_read_lock_held() &&
1480 !lockdep_commit_lock_is_held(net));
1482 chain = ERR_PTR(-ENOENT);
1484 list = rhltable_lookup(&table->chains_ht, search, nft_chain_ht_params);
1488 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
1489 if (nft_active_genmask(chain, genmask))
1492 chain = ERR_PTR(-ENOENT);
1498 static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
1499 [NFTA_CHAIN_TABLE] = { .type = NLA_STRING,
1500 .len = NFT_TABLE_MAXNAMELEN - 1 },
1501 [NFTA_CHAIN_HANDLE] = { .type = NLA_U64 },
1502 [NFTA_CHAIN_NAME] = { .type = NLA_STRING,
1503 .len = NFT_CHAIN_MAXNAMELEN - 1 },
1504 [NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
1505 [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
1506 [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
1507 .len = NFT_MODULE_AUTOLOAD_LIMIT },
1508 [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
1509 [NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
1510 [NFTA_CHAIN_ID] = { .type = NLA_U32 },
1511 [NFTA_CHAIN_USERDATA] = { .type = NLA_BINARY,
1512 .len = NFT_USERDATA_MAXLEN },
1515 static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
1516 [NFTA_HOOK_HOOKNUM] = { .type = NLA_U32 },
1517 [NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
1518 [NFTA_HOOK_DEV] = { .type = NLA_STRING,
1519 .len = IFNAMSIZ - 1 },
1522 static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
1524 struct nft_stats *cpu_stats, total;
1525 struct nlattr *nest;
1533 memset(&total, 0, sizeof(total));
1534 for_each_possible_cpu(cpu) {
1535 cpu_stats = per_cpu_ptr(stats, cpu);
1537 seq = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1538 pkts = cpu_stats->pkts;
1539 bytes = cpu_stats->bytes;
1540 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, seq));
1542 total.bytes += bytes;
1544 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_COUNTERS);
1546 goto nla_put_failure;
1548 if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts),
1549 NFTA_COUNTER_PAD) ||
1550 nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes),
1552 goto nla_put_failure;
1554 nla_nest_end(skb, nest);
1561 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
1562 const struct nft_base_chain *basechain)
1564 const struct nf_hook_ops *ops = &basechain->ops;
1565 struct nft_hook *hook, *first = NULL;
1566 struct nlattr *nest, *nest_devs;
1569 nest = nla_nest_start_noflag(skb, NFTA_CHAIN_HOOK);
1571 goto nla_put_failure;
1572 if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
1573 goto nla_put_failure;
1574 if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
1575 goto nla_put_failure;
1577 if (nft_base_chain_netdev(family, ops->hooknum)) {
1578 nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
1579 list_for_each_entry(hook, &basechain->hook_list, list) {
1583 if (nla_put_string(skb, NFTA_DEVICE_NAME,
1584 hook->ops.dev->name))
1585 goto nla_put_failure;
1588 nla_nest_end(skb, nest_devs);
1591 nla_put_string(skb, NFTA_HOOK_DEV, first->ops.dev->name))
1592 goto nla_put_failure;
1594 nla_nest_end(skb, nest);
1601 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
1602 u32 portid, u32 seq, int event, u32 flags,
1603 int family, const struct nft_table *table,
1604 const struct nft_chain *chain)
1606 struct nlmsghdr *nlh;
1608 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
1609 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
1610 NFNETLINK_V0, nft_base_seq(net));
1612 goto nla_put_failure;
1614 if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
1615 goto nla_put_failure;
1616 if (nla_put_be64(skb, NFTA_CHAIN_HANDLE, cpu_to_be64(chain->handle),
1618 goto nla_put_failure;
1619 if (nla_put_string(skb, NFTA_CHAIN_NAME, chain->name))
1620 goto nla_put_failure;
1622 if (nft_is_base_chain(chain)) {
1623 const struct nft_base_chain *basechain = nft_base_chain(chain);
1624 struct nft_stats __percpu *stats;
1626 if (nft_dump_basechain_hook(skb, family, basechain))
1627 goto nla_put_failure;
1629 if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
1630 htonl(basechain->policy)))
1631 goto nla_put_failure;
1633 if (nla_put_string(skb, NFTA_CHAIN_TYPE, basechain->type->name))
1634 goto nla_put_failure;
1636 stats = rcu_dereference_check(basechain->stats,
1637 lockdep_commit_lock_is_held(net));
1638 if (nft_dump_stats(skb, stats))
1639 goto nla_put_failure;
1643 nla_put_be32(skb, NFTA_CHAIN_FLAGS, htonl(chain->flags)))
1644 goto nla_put_failure;
1646 if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
1647 goto nla_put_failure;
1650 nla_put(skb, NFTA_CHAIN_USERDATA, chain->udlen, chain->udata))
1651 goto nla_put_failure;
1653 nlmsg_end(skb, nlh);
1657 nlmsg_trim(skb, nlh);
1661 static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
1663 struct nftables_pernet *nft_net;
1664 struct sk_buff *skb;
1669 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
1672 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1676 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
1677 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
1679 err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
1680 event, flags, ctx->family, ctx->table,
1687 nft_net = nft_pernet(ctx->net);
1688 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
1691 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
1694 static int nf_tables_dump_chains(struct sk_buff *skb,
1695 struct netlink_callback *cb)
1697 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1698 unsigned int idx = 0, s_idx = cb->args[0];
1699 struct net *net = sock_net(skb->sk);
1700 int family = nfmsg->nfgen_family;
1701 struct nftables_pernet *nft_net;
1702 const struct nft_table *table;
1703 const struct nft_chain *chain;
1706 nft_net = nft_pernet(net);
1707 cb->seq = READ_ONCE(nft_net->base_seq);
1709 list_for_each_entry_rcu(table, &nft_net->tables, list) {
1710 if (family != NFPROTO_UNSPEC && family != table->family)
1713 list_for_each_entry_rcu(chain, &table->chains, list) {
1717 memset(&cb->args[1], 0,
1718 sizeof(cb->args) - sizeof(cb->args[0]));
1719 if (!nft_is_active(net, chain))
1721 if (nf_tables_fill_chain_info(skb, net,
1722 NETLINK_CB(cb->skb).portid,
1726 table->family, table,
1730 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1741 /* called with rcu_read_lock held */
1742 static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
1743 const struct nlattr * const nla[])
1745 struct netlink_ext_ack *extack = info->extack;
1746 u8 genmask = nft_genmask_cur(info->net);
1747 u8 family = info->nfmsg->nfgen_family;
1748 const struct nft_chain *chain;
1749 struct net *net = info->net;
1750 struct nft_table *table;
1751 struct sk_buff *skb2;
1754 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
1755 struct netlink_dump_control c = {
1756 .dump = nf_tables_dump_chains,
1757 .module = THIS_MODULE,
1760 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
1763 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask, 0);
1764 if (IS_ERR(table)) {
1765 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
1766 return PTR_ERR(table);
1769 chain = nft_chain_lookup(net, table, nla[NFTA_CHAIN_NAME], genmask);
1770 if (IS_ERR(chain)) {
1771 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
1772 return PTR_ERR(chain);
1775 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1779 err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
1780 info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
1781 0, family, table, chain);
1783 goto err_fill_chain_info;
1785 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
1787 err_fill_chain_info:
1792 static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
1793 [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
1794 [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
1797 static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
1799 struct nlattr *tb[NFTA_COUNTER_MAX+1];
1800 struct nft_stats __percpu *newstats;
1801 struct nft_stats *stats;
1804 err = nla_parse_nested_deprecated(tb, NFTA_COUNTER_MAX, attr,
1805 nft_counter_policy, NULL);
1807 return ERR_PTR(err);
1809 if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
1810 return ERR_PTR(-EINVAL);
1812 newstats = netdev_alloc_pcpu_stats(struct nft_stats);
1813 if (newstats == NULL)
1814 return ERR_PTR(-ENOMEM);
1816 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1817 * are not exposed to userspace.
1820 stats = this_cpu_ptr(newstats);
1821 stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
1822 stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
1828 static void nft_chain_stats_replace(struct nft_trans *trans)
1830 struct nft_base_chain *chain = nft_base_chain(trans->ctx.chain);
1832 if (!nft_trans_chain_stats(trans))
1835 nft_trans_chain_stats(trans) =
1836 rcu_replace_pointer(chain->stats, nft_trans_chain_stats(trans),
1837 lockdep_commit_lock_is_held(trans->ctx.net));
1839 if (!nft_trans_chain_stats(trans))
1840 static_branch_inc(&nft_counters_enabled);
1843 static void nf_tables_chain_free_chain_rules(struct nft_chain *chain)
1845 struct nft_rule_blob *g0 = rcu_dereference_raw(chain->blob_gen_0);
1846 struct nft_rule_blob *g1 = rcu_dereference_raw(chain->blob_gen_1);
1852 /* should be NULL either via abort or via successful commit */
1853 WARN_ON_ONCE(chain->blob_next);
1854 kvfree(chain->blob_next);
1857 void nf_tables_chain_destroy(struct nft_ctx *ctx)
1859 struct nft_chain *chain = ctx->chain;
1860 struct nft_hook *hook, *next;
1862 if (WARN_ON(chain->use > 0))
1865 /* no concurrent access possible anymore */
1866 nf_tables_chain_free_chain_rules(chain);
1868 if (nft_is_base_chain(chain)) {
1869 struct nft_base_chain *basechain = nft_base_chain(chain);
1871 if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
1872 list_for_each_entry_safe(hook, next,
1873 &basechain->hook_list, list) {
1874 list_del_rcu(&hook->list);
1875 kfree_rcu(hook, rcu);
1878 module_put(basechain->type->owner);
1879 if (rcu_access_pointer(basechain->stats)) {
1880 static_branch_dec(&nft_counters_enabled);
1881 free_percpu(rcu_dereference_raw(basechain->stats));
1884 kfree(chain->udata);
1888 kfree(chain->udata);
1893 static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
1894 const struct nlattr *attr)
1896 struct net_device *dev;
1897 char ifname[IFNAMSIZ];
1898 struct nft_hook *hook;
1901 hook = kmalloc(sizeof(struct nft_hook), GFP_KERNEL_ACCOUNT);
1904 goto err_hook_alloc;
1907 nla_strscpy(ifname, attr, IFNAMSIZ);
1908 /* nf_tables_netdev_event() is called under rtnl_mutex, this is
1909 * indirectly serializing all the other holders of the commit_mutex with
1912 dev = __dev_get_by_name(net, ifname);
1917 hook->ops.dev = dev;
1924 return ERR_PTR(err);
1927 static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
1928 const struct nft_hook *this)
1930 struct nft_hook *hook;
1932 list_for_each_entry(hook, hook_list, list) {
1933 if (this->ops.dev == hook->ops.dev)
1940 static int nf_tables_parse_netdev_hooks(struct net *net,
1941 const struct nlattr *attr,
1942 struct list_head *hook_list)
1944 struct nft_hook *hook, *next;
1945 const struct nlattr *tmp;
1946 int rem, n = 0, err;
1948 nla_for_each_nested(tmp, attr, rem) {
1949 if (nla_type(tmp) != NFTA_DEVICE_NAME) {
1954 hook = nft_netdev_hook_alloc(net, tmp);
1956 err = PTR_ERR(hook);
1959 if (nft_hook_list_find(hook_list, hook)) {
1964 list_add_tail(&hook->list, hook_list);
1967 if (n == NFT_NETDEVICE_MAX) {
1976 list_for_each_entry_safe(hook, next, hook_list, list) {
1977 list_del(&hook->list);
1983 struct nft_chain_hook {
1986 const struct nft_chain_type *type;
1987 struct list_head list;
1990 static int nft_chain_parse_netdev(struct net *net,
1991 struct nlattr *tb[],
1992 struct list_head *hook_list)
1994 struct nft_hook *hook;
1997 if (tb[NFTA_HOOK_DEV]) {
1998 hook = nft_netdev_hook_alloc(net, tb[NFTA_HOOK_DEV]);
2000 return PTR_ERR(hook);
2002 list_add_tail(&hook->list, hook_list);
2003 } else if (tb[NFTA_HOOK_DEVS]) {
2004 err = nf_tables_parse_netdev_hooks(net, tb[NFTA_HOOK_DEVS],
2009 if (list_empty(hook_list))
2018 static int nft_chain_parse_hook(struct net *net,
2019 const struct nlattr * const nla[],
2020 struct nft_chain_hook *hook, u8 family,
2021 struct netlink_ext_ack *extack, bool autoload)
2023 struct nftables_pernet *nft_net = nft_pernet(net);
2024 struct nlattr *ha[NFTA_HOOK_MAX + 1];
2025 const struct nft_chain_type *type;
2028 lockdep_assert_held(&nft_net->commit_mutex);
2029 lockdep_nfnl_nft_mutex_not_held();
2031 err = nla_parse_nested_deprecated(ha, NFTA_HOOK_MAX,
2032 nla[NFTA_CHAIN_HOOK],
2033 nft_hook_policy, NULL);
2037 if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
2038 ha[NFTA_HOOK_PRIORITY] == NULL)
2041 hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
2042 hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
2044 type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
2048 if (nla[NFTA_CHAIN_TYPE]) {
2049 type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
2052 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2053 return PTR_ERR(type);
2056 if (hook->num >= NFT_MAX_HOOKS || !(type->hook_mask & (1 << hook->num)))
2059 if (type->type == NFT_CHAIN_T_NAT &&
2060 hook->priority <= NF_IP_PRI_CONNTRACK)
2063 if (!try_module_get(type->owner)) {
2064 if (nla[NFTA_CHAIN_TYPE])
2065 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
2071 INIT_LIST_HEAD(&hook->list);
2072 if (nft_base_chain_netdev(family, hook->num)) {
2073 err = nft_chain_parse_netdev(net, ha, &hook->list);
2075 module_put(type->owner);
2078 } else if (ha[NFTA_HOOK_DEV] || ha[NFTA_HOOK_DEVS]) {
2079 module_put(type->owner);
2086 static void nft_chain_release_hook(struct nft_chain_hook *hook)
2088 struct nft_hook *h, *next;
2090 list_for_each_entry_safe(h, next, &hook->list, list) {
2094 module_put(hook->type->owner);
2097 struct nft_rules_old {
2099 struct nft_rule_blob *blob;
2102 static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
2104 struct nft_rule_dp *prule;
2106 prule = (struct nft_rule_dp *)ptr;
2108 /* blob size does not include the trailer rule */
2111 static struct nft_rule_blob *nf_tables_chain_alloc_rules(unsigned int size)
2113 struct nft_rule_blob *blob;
2115 /* size must include room for the last rule */
2116 if (size < offsetof(struct nft_rule_dp, data))
2119 size += sizeof(struct nft_rule_blob) + sizeof(struct nft_rules_old);
2123 blob = kvmalloc(size, GFP_KERNEL_ACCOUNT);
2128 nft_last_rule(blob, blob->data);
2133 static void nft_basechain_hook_init(struct nf_hook_ops *ops, u8 family,
2134 const struct nft_chain_hook *hook,
2135 struct nft_chain *chain)
2138 ops->hooknum = hook->num;
2139 ops->priority = hook->priority;
2141 ops->hook = hook->type->hooks[ops->hooknum];
2142 ops->hook_ops_type = NF_HOOK_OP_NF_TABLES;
2145 static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
2146 struct nft_chain_hook *hook, u32 flags)
2148 struct nft_chain *chain;
2151 basechain->type = hook->type;
2152 INIT_LIST_HEAD(&basechain->hook_list);
2153 chain = &basechain->chain;
2155 if (nft_base_chain_netdev(family, hook->num)) {
2156 list_splice_init(&hook->list, &basechain->hook_list);
2157 list_for_each_entry(h, &basechain->hook_list, list)
2158 nft_basechain_hook_init(&h->ops, family, hook, chain);
2160 basechain->ops.hooknum = hook->num;
2161 basechain->ops.priority = hook->priority;
2163 nft_basechain_hook_init(&basechain->ops, family, hook, chain);
2166 chain->flags |= NFT_CHAIN_BASE | flags;
2167 basechain->policy = NF_ACCEPT;
2168 if (chain->flags & NFT_CHAIN_HW_OFFLOAD &&
2169 !nft_chain_offload_support(basechain)) {
2170 list_splice_init(&basechain->hook_list, &hook->list);
2174 flow_block_init(&basechain->flow_block);
2179 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2183 err = rhltable_insert_key(&table->chains_ht, chain->name,
2184 &chain->rhlhead, nft_chain_ht_params);
2188 list_add_tail_rcu(&chain->list, &table->chains);
2193 static u64 chain_id;
2195 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2196 u8 policy, u32 flags,
2197 struct netlink_ext_ack *extack)
2199 const struct nlattr * const *nla = ctx->nla;
2200 struct nft_table *table = ctx->table;
2201 struct nft_base_chain *basechain;
2202 struct net *net = ctx->net;
2203 char name[NFT_NAME_MAXLEN];
2204 struct nft_rule_blob *blob;
2205 struct nft_trans *trans;
2206 struct nft_chain *chain;
2207 unsigned int data_size;
2210 if (table->use == UINT_MAX)
2213 if (nla[NFTA_CHAIN_HOOK]) {
2214 struct nft_stats __percpu *stats = NULL;
2215 struct nft_chain_hook hook;
2217 if (flags & NFT_CHAIN_BINDING)
2220 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2225 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2226 if (basechain == NULL) {
2227 nft_chain_release_hook(&hook);
2230 chain = &basechain->chain;
2232 if (nla[NFTA_CHAIN_COUNTERS]) {
2233 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2234 if (IS_ERR(stats)) {
2235 nft_chain_release_hook(&hook);
2237 return PTR_ERR(stats);
2239 rcu_assign_pointer(basechain->stats, stats);
2242 err = nft_basechain_init(basechain, family, &hook, flags);
2244 nft_chain_release_hook(&hook);
2250 static_branch_inc(&nft_counters_enabled);
2252 if (flags & NFT_CHAIN_BASE)
2254 if (flags & NFT_CHAIN_HW_OFFLOAD)
2257 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2261 chain->flags = flags;
2265 INIT_LIST_HEAD(&chain->rules);
2266 chain->handle = nf_tables_alloc_handle(table);
2267 chain->table = table;
2269 if (nla[NFTA_CHAIN_NAME]) {
2270 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2272 if (!(flags & NFT_CHAIN_BINDING)) {
2274 goto err_destroy_chain;
2277 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2278 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2283 goto err_destroy_chain;
2286 if (nla[NFTA_CHAIN_USERDATA]) {
2287 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2288 if (chain->udata == NULL) {
2290 goto err_destroy_chain;
2292 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2295 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2296 blob = nf_tables_chain_alloc_rules(data_size);
2299 goto err_destroy_chain;
2302 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2303 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2305 err = nf_tables_register_hook(net, table, chain);
2307 goto err_destroy_chain;
2309 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2310 if (IS_ERR(trans)) {
2311 err = PTR_ERR(trans);
2312 goto err_unregister_hook;
2315 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2316 if (nft_is_base_chain(chain))
2317 nft_trans_chain_policy(trans) = policy;
2319 err = nft_chain_add(table, chain);
2321 nft_trans_destroy(trans);
2322 goto err_unregister_hook;
2328 err_unregister_hook:
2329 nf_tables_unregister_hook(net, table, chain);
2331 nf_tables_chain_destroy(ctx);
2336 static bool nft_hook_list_equal(struct list_head *hook_list1,
2337 struct list_head *hook_list2)
2339 struct nft_hook *hook;
2343 list_for_each_entry(hook, hook_list2, list) {
2344 if (!nft_hook_list_find(hook_list1, hook))
2349 list_for_each_entry(hook, hook_list1, list)
2355 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2356 u32 flags, const struct nlattr *attr,
2357 struct netlink_ext_ack *extack)
2359 const struct nlattr * const *nla = ctx->nla;
2360 struct nft_table *table = ctx->table;
2361 struct nft_chain *chain = ctx->chain;
2362 struct nft_base_chain *basechain;
2363 struct nft_stats *stats = NULL;
2364 struct nft_chain_hook hook;
2365 struct nf_hook_ops *ops;
2366 struct nft_trans *trans;
2369 if (chain->flags ^ flags)
2372 if (nla[NFTA_CHAIN_HOOK]) {
2373 if (!nft_is_base_chain(chain)) {
2374 NL_SET_BAD_ATTR(extack, attr);
2377 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2382 basechain = nft_base_chain(chain);
2383 if (basechain->type != hook.type) {
2384 nft_chain_release_hook(&hook);
2385 NL_SET_BAD_ATTR(extack, attr);
2389 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2390 if (!nft_hook_list_equal(&basechain->hook_list,
2392 nft_chain_release_hook(&hook);
2393 NL_SET_BAD_ATTR(extack, attr);
2397 ops = &basechain->ops;
2398 if (ops->hooknum != hook.num ||
2399 ops->priority != hook.priority) {
2400 nft_chain_release_hook(&hook);
2401 NL_SET_BAD_ATTR(extack, attr);
2405 nft_chain_release_hook(&hook);
2408 if (nla[NFTA_CHAIN_HANDLE] &&
2409 nla[NFTA_CHAIN_NAME]) {
2410 struct nft_chain *chain2;
2412 chain2 = nft_chain_lookup(ctx->net, table,
2413 nla[NFTA_CHAIN_NAME], genmask);
2414 if (!IS_ERR(chain2)) {
2415 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2420 if (nla[NFTA_CHAIN_COUNTERS]) {
2421 if (!nft_is_base_chain(chain))
2424 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2426 return PTR_ERR(stats);
2430 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2431 sizeof(struct nft_trans_chain));
2435 nft_trans_chain_stats(trans) = stats;
2436 nft_trans_chain_update(trans) = true;
2438 if (nla[NFTA_CHAIN_POLICY])
2439 nft_trans_chain_policy(trans) = policy;
2441 nft_trans_chain_policy(trans) = -1;
2443 if (nla[NFTA_CHAIN_HANDLE] &&
2444 nla[NFTA_CHAIN_NAME]) {
2445 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2446 struct nft_trans *tmp;
2450 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2455 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2456 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2457 tmp->ctx.table == table &&
2458 nft_trans_chain_update(tmp) &&
2459 nft_trans_chain_name(tmp) &&
2460 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2461 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2467 nft_trans_chain_name(trans) = name;
2469 nft_trans_commit_list_add_tail(ctx->net, trans);
2478 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2479 const struct nft_table *table,
2480 const struct nlattr *nla)
2482 struct nftables_pernet *nft_net = nft_pernet(net);
2483 u32 id = ntohl(nla_get_be32(nla));
2484 struct nft_trans *trans;
2486 list_for_each_entry(trans, &nft_net->commit_list, list) {
2487 struct nft_chain *chain = trans->ctx.chain;
2489 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2490 chain->table == table &&
2491 id == nft_trans_chain_id(trans))
2494 return ERR_PTR(-ENOENT);
2497 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2498 const struct nlattr * const nla[])
2500 struct nftables_pernet *nft_net = nft_pernet(info->net);
2501 struct netlink_ext_ack *extack = info->extack;
2502 u8 genmask = nft_genmask_next(info->net);
2503 u8 family = info->nfmsg->nfgen_family;
2504 struct nft_chain *chain = NULL;
2505 struct net *net = info->net;
2506 const struct nlattr *attr;
2507 struct nft_table *table;
2508 u8 policy = NF_ACCEPT;
2513 lockdep_assert_held(&nft_net->commit_mutex);
2515 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2516 NETLINK_CB(skb).portid);
2517 if (IS_ERR(table)) {
2518 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2519 return PTR_ERR(table);
2523 attr = nla[NFTA_CHAIN_NAME];
2525 if (nla[NFTA_CHAIN_HANDLE]) {
2526 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2527 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2528 if (IS_ERR(chain)) {
2529 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2530 return PTR_ERR(chain);
2532 attr = nla[NFTA_CHAIN_HANDLE];
2533 } else if (nla[NFTA_CHAIN_NAME]) {
2534 chain = nft_chain_lookup(net, table, attr, genmask);
2535 if (IS_ERR(chain)) {
2536 if (PTR_ERR(chain) != -ENOENT) {
2537 NL_SET_BAD_ATTR(extack, attr);
2538 return PTR_ERR(chain);
2542 } else if (!nla[NFTA_CHAIN_ID]) {
2546 if (nla[NFTA_CHAIN_POLICY]) {
2547 if (chain != NULL &&
2548 !nft_is_base_chain(chain)) {
2549 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2553 if (chain == NULL &&
2554 nla[NFTA_CHAIN_HOOK] == NULL) {
2555 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2559 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2569 if (nla[NFTA_CHAIN_FLAGS])
2570 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2572 flags = chain->flags;
2574 if (flags & ~NFT_CHAIN_FLAGS)
2577 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2579 if (chain != NULL) {
2580 if (chain->flags & NFT_CHAIN_BINDING)
2583 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2584 NL_SET_BAD_ATTR(extack, attr);
2587 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2590 flags |= chain->flags & NFT_CHAIN_BASE;
2591 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2595 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2598 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2599 const struct nlattr * const nla[])
2601 struct netlink_ext_ack *extack = info->extack;
2602 u8 genmask = nft_genmask_next(info->net);
2603 u8 family = info->nfmsg->nfgen_family;
2604 struct net *net = info->net;
2605 const struct nlattr *attr;
2606 struct nft_table *table;
2607 struct nft_chain *chain;
2608 struct nft_rule *rule;
2614 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2615 NETLINK_CB(skb).portid);
2616 if (IS_ERR(table)) {
2617 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2618 return PTR_ERR(table);
2621 if (nla[NFTA_CHAIN_HANDLE]) {
2622 attr = nla[NFTA_CHAIN_HANDLE];
2623 handle = be64_to_cpu(nla_get_be64(attr));
2624 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2626 attr = nla[NFTA_CHAIN_NAME];
2627 chain = nft_chain_lookup(net, table, attr, genmask);
2629 if (IS_ERR(chain)) {
2630 NL_SET_BAD_ATTR(extack, attr);
2631 return PTR_ERR(chain);
2634 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2638 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2641 list_for_each_entry(rule, &chain->rules, list) {
2642 if (!nft_is_active_next(net, rule))
2646 err = nft_delrule(&ctx, rule);
2651 /* There are rules and elements that are still holding references to us,
2652 * we cannot do a recursive removal in this case.
2655 NL_SET_BAD_ATTR(extack, attr);
2659 return nft_delchain(&ctx);
2667 * nft_register_expr - register nf_tables expr type
2670 * Registers the expr type for use with nf_tables. Returns zero on
2671 * success or a negative errno code otherwise.
2673 int nft_register_expr(struct nft_expr_type *type)
2675 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2676 if (type->family == NFPROTO_UNSPEC)
2677 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2679 list_add_rcu(&type->list, &nf_tables_expressions);
2680 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2683 EXPORT_SYMBOL_GPL(nft_register_expr);
2686 * nft_unregister_expr - unregister nf_tables expr type
2689 * Unregisters the expr typefor use with nf_tables.
2691 void nft_unregister_expr(struct nft_expr_type *type)
2693 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2694 list_del_rcu(&type->list);
2695 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2697 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2699 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2702 const struct nft_expr_type *type, *candidate = NULL;
2704 list_for_each_entry(type, &nf_tables_expressions, list) {
2705 if (!nla_strcmp(nla, type->name)) {
2706 if (!type->family && !candidate)
2708 else if (type->family == family)
2715 #ifdef CONFIG_MODULES
2716 static int nft_expr_type_request_module(struct net *net, u8 family,
2719 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2720 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2727 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2731 const struct nft_expr_type *type;
2734 return ERR_PTR(-EINVAL);
2736 type = __nft_expr_type_get(family, nla);
2737 if (type != NULL && try_module_get(type->owner))
2740 lockdep_nfnl_nft_mutex_not_held();
2741 #ifdef CONFIG_MODULES
2743 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2744 return ERR_PTR(-EAGAIN);
2746 if (nft_request_module(net, "nft-expr-%.*s",
2748 (char *)nla_data(nla)) == -EAGAIN)
2749 return ERR_PTR(-EAGAIN);
2752 return ERR_PTR(-ENOENT);
2755 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2756 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2757 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2758 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2761 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2762 const struct nft_expr *expr)
2764 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2765 goto nla_put_failure;
2767 if (expr->ops->dump) {
2768 struct nlattr *data = nla_nest_start_noflag(skb,
2771 goto nla_put_failure;
2772 if (expr->ops->dump(skb, expr) < 0)
2773 goto nla_put_failure;
2774 nla_nest_end(skb, data);
2783 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2784 const struct nft_expr *expr)
2786 struct nlattr *nest;
2788 nest = nla_nest_start_noflag(skb, attr);
2790 goto nla_put_failure;
2791 if (nf_tables_fill_expr_info(skb, expr) < 0)
2792 goto nla_put_failure;
2793 nla_nest_end(skb, nest);
2800 struct nft_expr_info {
2801 const struct nft_expr_ops *ops;
2802 const struct nlattr *attr;
2803 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2806 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2807 const struct nlattr *nla,
2808 struct nft_expr_info *info)
2810 const struct nft_expr_type *type;
2811 const struct nft_expr_ops *ops;
2812 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2815 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2816 nft_expr_policy, NULL);
2820 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2822 return PTR_ERR(type);
2824 if (tb[NFTA_EXPR_DATA]) {
2825 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2827 type->policy, NULL);
2831 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2833 if (type->select_ops != NULL) {
2834 ops = type->select_ops(ctx,
2835 (const struct nlattr * const *)info->tb);
2838 #ifdef CONFIG_MODULES
2840 if (nft_expr_type_request_module(ctx->net,
2842 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2856 module_put(type->owner);
2860 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2861 const struct nft_expr_info *expr_info,
2862 struct nft_expr *expr)
2864 const struct nft_expr_ops *ops = expr_info->ops;
2869 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2880 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2881 struct nft_expr *expr)
2883 const struct nft_expr_type *type = expr->ops->type;
2885 if (expr->ops->destroy)
2886 expr->ops->destroy(ctx, expr);
2887 module_put(type->owner);
2890 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2891 const struct nlattr *nla)
2893 struct nft_expr_info expr_info;
2894 struct nft_expr *expr;
2895 struct module *owner;
2898 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2900 goto err_expr_parse;
2903 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2904 goto err_expr_stateful;
2907 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2909 goto err_expr_stateful;
2911 err = nf_tables_newexpr(ctx, &expr_info, expr);
2919 owner = expr_info.ops->type->owner;
2920 if (expr_info.ops->type->release_ops)
2921 expr_info.ops->type->release_ops(expr_info.ops);
2925 return ERR_PTR(err);
2928 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2932 if (src->ops->clone) {
2933 dst->ops = src->ops;
2934 err = src->ops->clone(dst, src);
2938 memcpy(dst, src, src->ops->size);
2941 __module_get(src->ops->type->owner);
2946 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2948 nf_tables_expr_destroy(ctx, expr);
2956 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2959 struct nft_rule *rule;
2961 // FIXME: this sucks
2962 list_for_each_entry_rcu(rule, &chain->rules, list) {
2963 if (handle == rule->handle)
2967 return ERR_PTR(-ENOENT);
2970 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2971 const struct nlattr *nla)
2974 return ERR_PTR(-EINVAL);
2976 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2979 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2980 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2981 .len = NFT_TABLE_MAXNAMELEN - 1 },
2982 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2983 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2984 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2985 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2986 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2987 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2988 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2989 .len = NFT_USERDATA_MAXLEN },
2990 [NFTA_RULE_ID] = { .type = NLA_U32 },
2991 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2992 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2995 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2996 u32 portid, u32 seq, int event,
2997 u32 flags, int family,
2998 const struct nft_table *table,
2999 const struct nft_chain *chain,
3000 const struct nft_rule *rule, u64 handle)
3002 struct nlmsghdr *nlh;
3003 const struct nft_expr *expr, *next;
3004 struct nlattr *list;
3005 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3007 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3010 goto nla_put_failure;
3012 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3013 goto nla_put_failure;
3014 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3015 goto nla_put_failure;
3016 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3018 goto nla_put_failure;
3020 if (event != NFT_MSG_DELRULE && handle) {
3021 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3023 goto nla_put_failure;
3026 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3027 nft_flow_rule_stats(chain, rule);
3029 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3031 goto nla_put_failure;
3032 nft_rule_for_each_expr(expr, next, rule) {
3033 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3034 goto nla_put_failure;
3036 nla_nest_end(skb, list);
3039 struct nft_userdata *udata = nft_userdata(rule);
3040 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3042 goto nla_put_failure;
3045 nlmsg_end(skb, nlh);
3049 nlmsg_trim(skb, nlh);
3053 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3054 const struct nft_rule *rule, int event)
3056 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3057 const struct nft_rule *prule;
3058 struct sk_buff *skb;
3064 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3067 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3071 if (event == NFT_MSG_NEWRULE &&
3072 !list_is_first(&rule->list, &ctx->chain->rules) &&
3073 !list_is_last(&rule->list, &ctx->chain->rules)) {
3074 prule = list_prev_entry(rule, list);
3075 handle = prule->handle;
3077 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3078 flags |= NLM_F_APPEND;
3079 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3080 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3082 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3083 event, flags, ctx->family, ctx->table,
3084 ctx->chain, rule, handle);
3090 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3093 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3096 struct nft_rule_dump_ctx {
3101 static int __nf_tables_dump_rules(struct sk_buff *skb,
3103 struct netlink_callback *cb,
3104 const struct nft_table *table,
3105 const struct nft_chain *chain)
3107 struct net *net = sock_net(skb->sk);
3108 const struct nft_rule *rule, *prule;
3109 unsigned int s_idx = cb->args[0];
3113 list_for_each_entry_rcu(rule, &chain->rules, list) {
3114 if (!nft_is_active(net, rule))
3119 memset(&cb->args[1], 0,
3120 sizeof(cb->args) - sizeof(cb->args[0]));
3123 handle = prule->handle;
3127 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3130 NLM_F_MULTI | NLM_F_APPEND,
3132 table, chain, rule, handle) < 0)
3135 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3144 static int nf_tables_dump_rules(struct sk_buff *skb,
3145 struct netlink_callback *cb)
3147 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3148 const struct nft_rule_dump_ctx *ctx = cb->data;
3149 struct nft_table *table;
3150 const struct nft_chain *chain;
3151 unsigned int idx = 0;
3152 struct net *net = sock_net(skb->sk);
3153 int family = nfmsg->nfgen_family;
3154 struct nftables_pernet *nft_net;
3157 nft_net = nft_pernet(net);
3158 cb->seq = READ_ONCE(nft_net->base_seq);
3160 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3161 if (family != NFPROTO_UNSPEC && family != table->family)
3164 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3167 if (ctx && ctx->table && ctx->chain) {
3168 struct rhlist_head *list, *tmp;
3170 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3171 nft_chain_ht_params);
3175 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3176 if (!nft_is_active(net, chain))
3178 __nf_tables_dump_rules(skb, &idx,
3185 list_for_each_entry_rcu(chain, &table->chains, list) {
3186 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3190 if (ctx && ctx->table)
3200 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3202 const struct nlattr * const *nla = cb->data;
3203 struct nft_rule_dump_ctx *ctx = NULL;
3205 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3206 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3210 if (nla[NFTA_RULE_TABLE]) {
3211 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3218 if (nla[NFTA_RULE_CHAIN]) {
3219 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3233 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3235 struct nft_rule_dump_ctx *ctx = cb->data;
3245 /* called with rcu_read_lock held */
3246 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3247 const struct nlattr * const nla[])
3249 struct netlink_ext_ack *extack = info->extack;
3250 u8 genmask = nft_genmask_cur(info->net);
3251 u8 family = info->nfmsg->nfgen_family;
3252 const struct nft_chain *chain;
3253 const struct nft_rule *rule;
3254 struct net *net = info->net;
3255 struct nft_table *table;
3256 struct sk_buff *skb2;
3259 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3260 struct netlink_dump_control c = {
3261 .start= nf_tables_dump_rules_start,
3262 .dump = nf_tables_dump_rules,
3263 .done = nf_tables_dump_rules_done,
3264 .module = THIS_MODULE,
3265 .data = (void *)nla,
3268 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3271 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3272 if (IS_ERR(table)) {
3273 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3274 return PTR_ERR(table);
3277 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3278 if (IS_ERR(chain)) {
3279 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3280 return PTR_ERR(chain);
3283 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3285 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3286 return PTR_ERR(rule);
3289 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3293 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3294 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3295 family, table, chain, rule, 0);
3297 goto err_fill_rule_info;
3299 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3306 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3307 struct nft_rule *rule)
3309 struct nft_expr *expr, *next;
3312 * Careful: some expressions might not be initialized in case this
3313 * is called on error from nf_tables_newrule().
3315 expr = nft_expr_first(rule);
3316 while (nft_expr_more(rule, expr)) {
3317 next = nft_expr_next(expr);
3318 nf_tables_expr_destroy(ctx, expr);
3324 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3326 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3327 nf_tables_rule_destroy(ctx, rule);
3330 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3332 struct nft_expr *expr, *last;
3333 const struct nft_data *data;
3334 struct nft_rule *rule;
3337 if (ctx->level == NFT_JUMP_STACK_SIZE)
3340 list_for_each_entry(rule, &chain->rules, list) {
3341 if (!nft_is_active_next(ctx->net, rule))
3344 nft_rule_for_each_expr(expr, last, rule) {
3345 if (!expr->ops->validate)
3348 err = expr->ops->validate(ctx, expr, &data);
3358 EXPORT_SYMBOL_GPL(nft_chain_validate);
3360 static int nft_table_validate(struct net *net, const struct nft_table *table)
3362 struct nft_chain *chain;
3363 struct nft_ctx ctx = {
3365 .family = table->family,
3369 list_for_each_entry(chain, &table->chains, list) {
3370 if (!nft_is_base_chain(chain))
3374 err = nft_chain_validate(&ctx, chain);
3382 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3383 const struct nft_chain *chain,
3384 const struct nlattr *nla);
3386 #define NFT_RULE_MAXEXPRS 128
3388 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3389 const struct nlattr * const nla[])
3391 struct nftables_pernet *nft_net = nft_pernet(info->net);
3392 struct netlink_ext_ack *extack = info->extack;
3393 unsigned int size, i, n, ulen = 0, usize = 0;
3394 u8 genmask = nft_genmask_next(info->net);
3395 struct nft_rule *rule, *old_rule = NULL;
3396 struct nft_expr_info *expr_info = NULL;
3397 u8 family = info->nfmsg->nfgen_family;
3398 struct nft_flow_rule *flow = NULL;
3399 struct net *net = info->net;
3400 struct nft_userdata *udata;
3401 struct nft_table *table;
3402 struct nft_chain *chain;
3403 struct nft_trans *trans;
3404 u64 handle, pos_handle;
3405 struct nft_expr *expr;
3410 lockdep_assert_held(&nft_net->commit_mutex);
3412 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3413 NETLINK_CB(skb).portid);
3414 if (IS_ERR(table)) {
3415 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3416 return PTR_ERR(table);
3419 if (nla[NFTA_RULE_CHAIN]) {
3420 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3422 if (IS_ERR(chain)) {
3423 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3424 return PTR_ERR(chain);
3426 if (nft_chain_is_bound(chain))
3429 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3430 chain = nft_chain_lookup_byid(net, table, nla[NFTA_RULE_CHAIN_ID]);
3431 if (IS_ERR(chain)) {
3432 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3433 return PTR_ERR(chain);
3439 if (nla[NFTA_RULE_HANDLE]) {
3440 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3441 rule = __nft_rule_lookup(chain, handle);
3443 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3444 return PTR_ERR(rule);
3447 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3448 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3451 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3456 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3457 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3459 handle = nf_tables_alloc_handle(table);
3461 if (chain->use == UINT_MAX)
3464 if (nla[NFTA_RULE_POSITION]) {
3465 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3466 old_rule = __nft_rule_lookup(chain, pos_handle);
3467 if (IS_ERR(old_rule)) {
3468 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3469 return PTR_ERR(old_rule);
3471 } else if (nla[NFTA_RULE_POSITION_ID]) {
3472 old_rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_POSITION_ID]);
3473 if (IS_ERR(old_rule)) {
3474 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3475 return PTR_ERR(old_rule);
3480 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3484 if (nla[NFTA_RULE_EXPRESSIONS]) {
3485 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3486 sizeof(struct nft_expr_info),
3491 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3493 if (nla_type(tmp) != NFTA_LIST_ELEM)
3494 goto err_release_expr;
3495 if (n == NFT_RULE_MAXEXPRS)
3496 goto err_release_expr;
3497 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3499 NL_SET_BAD_ATTR(extack, tmp);
3500 goto err_release_expr;
3502 size += expr_info[n].ops->size;
3506 /* Check for overflow of dlen field */
3508 if (size >= 1 << 12)
3509 goto err_release_expr;
3511 if (nla[NFTA_RULE_USERDATA]) {
3512 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3514 usize = sizeof(struct nft_userdata) + ulen;
3518 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3520 goto err_release_expr;
3522 nft_activate_next(net, rule);
3524 rule->handle = handle;
3526 rule->udata = ulen ? 1 : 0;
3529 udata = nft_userdata(rule);
3530 udata->len = ulen - 1;
3531 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3534 expr = nft_expr_first(rule);
3535 for (i = 0; i < n; i++) {
3536 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3538 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3539 goto err_release_rule;
3542 if (expr_info[i].ops->validate)
3543 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3545 expr_info[i].ops = NULL;
3546 expr = nft_expr_next(expr);
3549 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3550 flow = nft_flow_rule_create(net, rule);
3552 err = PTR_ERR(flow);
3553 goto err_release_rule;
3557 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3558 err = nft_delrule(&ctx, old_rule);
3560 goto err_destroy_flow_rule;
3562 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3563 if (trans == NULL) {
3565 goto err_destroy_flow_rule;
3567 list_add_tail_rcu(&rule->list, &old_rule->list);
3569 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3572 goto err_destroy_flow_rule;
3575 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3577 list_add_rcu(&rule->list, &old_rule->list);
3579 list_add_tail_rcu(&rule->list, &chain->rules);
3582 list_add_tail_rcu(&rule->list, &old_rule->list);
3584 list_add_rcu(&rule->list, &chain->rules);
3591 nft_trans_flow_rule(trans) = flow;
3593 if (nft_net->validate_state == NFT_VALIDATE_DO)
3594 return nft_table_validate(net, table);
3598 err_destroy_flow_rule:
3600 nft_flow_rule_destroy(flow);
3602 nf_tables_rule_release(&ctx, rule);
3604 for (i = 0; i < n; i++) {
3605 if (expr_info[i].ops) {
3606 module_put(expr_info[i].ops->type->owner);
3607 if (expr_info[i].ops->type->release_ops)
3608 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3616 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3617 const struct nft_chain *chain,
3618 const struct nlattr *nla)
3620 struct nftables_pernet *nft_net = nft_pernet(net);
3621 u32 id = ntohl(nla_get_be32(nla));
3622 struct nft_trans *trans;
3624 list_for_each_entry(trans, &nft_net->commit_list, list) {
3625 struct nft_rule *rule = nft_trans_rule(trans);
3627 if (trans->msg_type == NFT_MSG_NEWRULE &&
3628 trans->ctx.chain == chain &&
3629 id == nft_trans_rule_id(trans))
3632 return ERR_PTR(-ENOENT);
3635 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3636 const struct nlattr * const nla[])
3638 struct netlink_ext_ack *extack = info->extack;
3639 u8 genmask = nft_genmask_next(info->net);
3640 u8 family = info->nfmsg->nfgen_family;
3641 struct nft_chain *chain = NULL;
3642 struct net *net = info->net;
3643 struct nft_table *table;
3644 struct nft_rule *rule;
3648 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3649 NETLINK_CB(skb).portid);
3650 if (IS_ERR(table)) {
3651 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3652 return PTR_ERR(table);
3655 if (nla[NFTA_RULE_CHAIN]) {
3656 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3658 if (IS_ERR(chain)) {
3659 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3660 return PTR_ERR(chain);
3662 if (nft_chain_is_bound(chain))
3666 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3669 if (nla[NFTA_RULE_HANDLE]) {
3670 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3672 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3673 return PTR_ERR(rule);
3676 err = nft_delrule(&ctx, rule);
3677 } else if (nla[NFTA_RULE_ID]) {
3678 rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
3680 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3681 return PTR_ERR(rule);
3684 err = nft_delrule(&ctx, rule);
3686 err = nft_delrule_by_chain(&ctx);
3689 list_for_each_entry(chain, &table->chains, list) {
3690 if (!nft_is_active_next(net, chain))
3694 err = nft_delrule_by_chain(&ctx);
3706 static const struct nft_set_type *nft_set_types[] = {
3707 &nft_set_hash_fast_type,
3709 &nft_set_rhash_type,
3710 &nft_set_bitmap_type,
3711 &nft_set_rbtree_type,
3712 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3713 &nft_set_pipapo_avx2_type,
3715 &nft_set_pipapo_type,
3718 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3719 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3722 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3724 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3728 * Select a set implementation based on the data characteristics and the
3729 * given policy. The total memory use might not be known if no size is
3730 * given, in that case the amount of memory per element is used.
3732 static const struct nft_set_ops *
3733 nft_select_set_ops(const struct nft_ctx *ctx,
3734 const struct nlattr * const nla[],
3735 const struct nft_set_desc *desc,
3736 enum nft_set_policies policy)
3738 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3739 const struct nft_set_ops *ops, *bops;
3740 struct nft_set_estimate est, best;
3741 const struct nft_set_type *type;
3745 lockdep_assert_held(&nft_net->commit_mutex);
3746 lockdep_nfnl_nft_mutex_not_held();
3748 if (nla[NFTA_SET_FLAGS] != NULL)
3749 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3756 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3757 type = nft_set_types[i];
3760 if (!nft_set_ops_candidate(type, flags))
3762 if (!ops->estimate(desc, flags, &est))
3766 case NFT_SET_POL_PERFORMANCE:
3767 if (est.lookup < best.lookup)
3769 if (est.lookup == best.lookup &&
3770 est.space < best.space)
3773 case NFT_SET_POL_MEMORY:
3775 if (est.space < best.space)
3777 if (est.space == best.space &&
3778 est.lookup < best.lookup)
3780 } else if (est.size < best.size || !bops) {
3795 return ERR_PTR(-EOPNOTSUPP);
3798 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3799 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3800 .len = NFT_TABLE_MAXNAMELEN - 1 },
3801 [NFTA_SET_NAME] = { .type = NLA_STRING,
3802 .len = NFT_SET_MAXNAMELEN - 1 },
3803 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3804 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3805 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3806 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3807 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3808 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3809 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3810 [NFTA_SET_ID] = { .type = NLA_U32 },
3811 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3812 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3813 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3814 .len = NFT_USERDATA_MAXLEN },
3815 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3816 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3817 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3818 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3821 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3822 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3823 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3826 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3827 const struct nlattr *nla, u8 genmask)
3829 struct nft_set *set;
3832 return ERR_PTR(-EINVAL);
3834 list_for_each_entry_rcu(set, &table->sets, list) {
3835 if (!nla_strcmp(nla, set->name) &&
3836 nft_active_genmask(set, genmask))
3839 return ERR_PTR(-ENOENT);
3842 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3843 const struct nlattr *nla,
3846 struct nft_set *set;
3848 list_for_each_entry(set, &table->sets, list) {
3849 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3850 nft_active_genmask(set, genmask))
3853 return ERR_PTR(-ENOENT);
3856 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3857 const struct nft_table *table,
3858 const struct nlattr *nla, u8 genmask)
3860 struct nftables_pernet *nft_net = nft_pernet(net);
3861 u32 id = ntohl(nla_get_be32(nla));
3862 struct nft_trans *trans;
3864 list_for_each_entry(trans, &nft_net->commit_list, list) {
3865 if (trans->msg_type == NFT_MSG_NEWSET) {
3866 struct nft_set *set = nft_trans_set(trans);
3868 if (id == nft_trans_set_id(trans) &&
3869 set->table == table &&
3870 nft_active_genmask(set, genmask))
3874 return ERR_PTR(-ENOENT);
3877 struct nft_set *nft_set_lookup_global(const struct net *net,
3878 const struct nft_table *table,
3879 const struct nlattr *nla_set_name,
3880 const struct nlattr *nla_set_id,
3883 struct nft_set *set;
3885 set = nft_set_lookup(table, nla_set_name, genmask);
3890 set = nft_set_lookup_byid(net, table, nla_set_id, genmask);
3894 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3896 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3899 const struct nft_set *i;
3901 unsigned long *inuse;
3902 unsigned int n = 0, min = 0;
3904 p = strchr(name, '%');
3906 if (p[1] != 'd' || strchr(p + 2, '%'))
3909 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3913 list_for_each_entry(i, &ctx->table->sets, list) {
3916 if (!nft_is_active_next(ctx->net, i))
3918 if (!sscanf(i->name, name, &tmp))
3920 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3923 set_bit(tmp - min, inuse);
3926 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3927 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3928 min += BITS_PER_BYTE * PAGE_SIZE;
3929 memset(inuse, 0, PAGE_SIZE);
3932 free_page((unsigned long)inuse);
3935 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3939 list_for_each_entry(i, &ctx->table->sets, list) {
3940 if (!nft_is_active_next(ctx->net, i))
3942 if (!strcmp(set->name, i->name)) {
3951 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3953 u64 ms = be64_to_cpu(nla_get_be64(nla));
3954 u64 max = (u64)(~((u64)0));
3956 max = div_u64(max, NSEC_PER_MSEC);
3960 ms *= NSEC_PER_MSEC;
3961 *result = nsecs_to_jiffies64(ms);
3965 __be64 nf_jiffies64_to_msecs(u64 input)
3967 return cpu_to_be64(jiffies64_to_msecs(input));
3970 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3971 const struct nft_set *set)
3973 struct nlattr *concat, *field;
3976 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3980 for (i = 0; i < set->field_count; i++) {
3981 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3985 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3986 htonl(set->field_len[i])))
3989 nla_nest_end(skb, field);
3992 nla_nest_end(skb, concat);
3997 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3998 const struct nft_set *set, u16 event, u16 flags)
4000 struct nlmsghdr *nlh;
4001 u32 portid = ctx->portid;
4002 struct nlattr *nest;
4006 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
4007 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
4008 NFNETLINK_V0, nft_base_seq(ctx->net));
4010 goto nla_put_failure;
4012 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
4013 goto nla_put_failure;
4014 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
4015 goto nla_put_failure;
4016 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4018 goto nla_put_failure;
4019 if (set->flags != 0)
4020 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4021 goto nla_put_failure;
4023 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4024 goto nla_put_failure;
4025 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4026 goto nla_put_failure;
4027 if (set->flags & NFT_SET_MAP) {
4028 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4029 goto nla_put_failure;
4030 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4031 goto nla_put_failure;
4033 if (set->flags & NFT_SET_OBJECT &&
4034 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4035 goto nla_put_failure;
4038 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4039 nf_jiffies64_to_msecs(set->timeout),
4041 goto nla_put_failure;
4043 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4044 goto nla_put_failure;
4046 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4047 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4048 goto nla_put_failure;
4052 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4053 goto nla_put_failure;
4055 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4057 goto nla_put_failure;
4059 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4060 goto nla_put_failure;
4062 if (set->field_count > 1 &&
4063 nf_tables_fill_set_concat(skb, set))
4064 goto nla_put_failure;
4066 nla_nest_end(skb, nest);
4068 if (set->num_exprs == 1) {
4069 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4070 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4071 goto nla_put_failure;
4073 nla_nest_end(skb, nest);
4074 } else if (set->num_exprs > 1) {
4075 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4077 goto nla_put_failure;
4079 for (i = 0; i < set->num_exprs; i++) {
4080 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4082 goto nla_put_failure;
4084 nla_nest_end(skb, nest);
4087 nlmsg_end(skb, nlh);
4091 nlmsg_trim(skb, nlh);
4095 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4096 const struct nft_set *set, int event,
4099 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4100 u32 portid = ctx->portid;
4101 struct sk_buff *skb;
4106 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4109 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4113 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4114 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4116 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4122 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4125 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4128 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4130 const struct nft_set *set;
4131 unsigned int idx, s_idx = cb->args[0];
4132 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4133 struct net *net = sock_net(skb->sk);
4134 struct nft_ctx *ctx = cb->data, ctx_set;
4135 struct nftables_pernet *nft_net;
4141 nft_net = nft_pernet(net);
4142 cb->seq = READ_ONCE(nft_net->base_seq);
4144 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4145 if (ctx->family != NFPROTO_UNSPEC &&
4146 ctx->family != table->family)
4149 if (ctx->table && ctx->table != table)
4153 if (cur_table != table)
4159 list_for_each_entry_rcu(set, &table->sets, list) {
4162 if (!nft_is_active(net, set))
4166 ctx_set.table = table;
4167 ctx_set.family = table->family;
4169 if (nf_tables_fill_set(skb, &ctx_set, set,
4173 cb->args[2] = (unsigned long) table;
4176 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4189 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4191 struct nft_ctx *ctx_dump = NULL;
4193 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4194 if (ctx_dump == NULL)
4197 cb->data = ctx_dump;
4201 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4207 /* called with rcu_read_lock held */
4208 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4209 const struct nlattr * const nla[])
4211 struct netlink_ext_ack *extack = info->extack;
4212 u8 genmask = nft_genmask_cur(info->net);
4213 u8 family = info->nfmsg->nfgen_family;
4214 struct nft_table *table = NULL;
4215 struct net *net = info->net;
4216 const struct nft_set *set;
4217 struct sk_buff *skb2;
4221 if (nla[NFTA_SET_TABLE]) {
4222 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4224 if (IS_ERR(table)) {
4225 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4226 return PTR_ERR(table);
4230 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4232 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4233 struct netlink_dump_control c = {
4234 .start = nf_tables_dump_sets_start,
4235 .dump = nf_tables_dump_sets,
4236 .done = nf_tables_dump_sets_done,
4238 .module = THIS_MODULE,
4241 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4244 /* Only accept unspec with dump */
4245 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4246 return -EAFNOSUPPORT;
4247 if (!nla[NFTA_SET_TABLE])
4250 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4252 return PTR_ERR(set);
4254 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4258 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4260 goto err_fill_set_info;
4262 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4269 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4270 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4273 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4274 struct nft_set_desc *desc)
4276 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4280 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4283 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4284 nft_concat_policy, NULL);
4288 if (!tb[NFTA_SET_FIELD_LEN])
4291 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4292 if (!len || len > U8_MAX)
4295 desc->field_len[desc->field_count++] = len;
4300 static int nft_set_desc_concat(struct nft_set_desc *desc,
4301 const struct nlattr *nla)
4303 struct nlattr *attr;
4307 nla_for_each_nested(attr, nla, rem) {
4308 if (nla_type(attr) != NFTA_LIST_ELEM)
4311 err = nft_set_desc_concat_parse(attr, desc);
4316 for (i = 0; i < desc->field_count; i++)
4317 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4319 if (num_regs > NFT_REG32_COUNT)
4325 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4326 const struct nlattr *nla)
4328 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4331 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4332 nft_set_desc_policy, NULL);
4336 if (da[NFTA_SET_DESC_SIZE] != NULL)
4337 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4338 if (da[NFTA_SET_DESC_CONCAT])
4339 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4344 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4345 const struct nlattr * const nla[])
4347 u32 ktype, dtype, flags, policy, gc_int, objtype;
4348 struct netlink_ext_ack *extack = info->extack;
4349 u8 genmask = nft_genmask_next(info->net);
4350 u8 family = info->nfmsg->nfgen_family;
4351 const struct nft_set_ops *ops;
4352 struct nft_expr *expr = NULL;
4353 struct net *net = info->net;
4354 struct nft_set_desc desc;
4355 struct nft_table *table;
4356 unsigned char *udata;
4357 struct nft_set *set;
4366 if (nla[NFTA_SET_TABLE] == NULL ||
4367 nla[NFTA_SET_NAME] == NULL ||
4368 nla[NFTA_SET_KEY_LEN] == NULL ||
4369 nla[NFTA_SET_ID] == NULL)
4372 memset(&desc, 0, sizeof(desc));
4374 ktype = NFT_DATA_VALUE;
4375 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4376 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4377 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4381 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4382 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4386 if (nla[NFTA_SET_FLAGS] != NULL) {
4387 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4388 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4389 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4390 NFT_SET_MAP | NFT_SET_EVAL |
4391 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4393 /* Only one of these operations is supported */
4394 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4395 (NFT_SET_MAP | NFT_SET_OBJECT))
4397 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4398 (NFT_SET_EVAL | NFT_SET_OBJECT))
4403 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4404 if (!(flags & NFT_SET_MAP))
4407 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4408 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4409 dtype != NFT_DATA_VERDICT)
4412 if (dtype != NFT_DATA_VERDICT) {
4413 if (nla[NFTA_SET_DATA_LEN] == NULL)
4415 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4416 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4419 desc.dlen = sizeof(struct nft_verdict);
4420 } else if (flags & NFT_SET_MAP)
4423 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4424 if (!(flags & NFT_SET_OBJECT))
4427 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4428 if (objtype == NFT_OBJECT_UNSPEC ||
4429 objtype > NFT_OBJECT_MAX)
4431 } else if (flags & NFT_SET_OBJECT)
4434 objtype = NFT_OBJECT_UNSPEC;
4437 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4438 if (!(flags & NFT_SET_TIMEOUT))
4441 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4446 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4447 if (!(flags & NFT_SET_TIMEOUT))
4449 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4452 policy = NFT_SET_POL_PERFORMANCE;
4453 if (nla[NFTA_SET_POLICY] != NULL)
4454 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4456 if (nla[NFTA_SET_DESC] != NULL) {
4457 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4461 if (desc.field_count > 1 && !(flags & NFT_SET_CONCAT))
4463 } else if (flags & NFT_SET_CONCAT) {
4467 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4470 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4471 NETLINK_CB(skb).portid);
4472 if (IS_ERR(table)) {
4473 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4474 return PTR_ERR(table);
4477 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4479 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4481 if (PTR_ERR(set) != -ENOENT) {
4482 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4483 return PTR_ERR(set);
4486 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4487 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4490 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4496 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4499 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4501 return PTR_ERR(ops);
4504 if (nla[NFTA_SET_USERDATA])
4505 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4508 if (ops->privsize != NULL)
4509 size = ops->privsize(nla, &desc);
4510 alloc_size = sizeof(*set) + size + udlen;
4511 if (alloc_size < size || alloc_size > INT_MAX)
4513 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4517 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4523 err = nf_tables_set_alloc_name(&ctx, set, name);
4530 udata = set->data + size;
4531 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4534 INIT_LIST_HEAD(&set->bindings);
4535 INIT_LIST_HEAD(&set->catchall_list);
4537 write_pnet(&set->net, net);
4540 set->klen = desc.klen;
4542 set->objtype = objtype;
4543 set->dlen = desc.dlen;
4545 set->size = desc.size;
4546 set->policy = policy;
4549 set->timeout = timeout;
4550 set->gc_int = gc_int;
4552 set->field_count = desc.field_count;
4553 for (i = 0; i < desc.field_count; i++)
4554 set->field_len[i] = desc.field_len[i];
4556 err = ops->init(set, &desc, nla);
4560 if (nla[NFTA_SET_EXPR]) {
4561 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4563 err = PTR_ERR(expr);
4564 goto err_set_expr_alloc;
4566 set->exprs[0] = expr;
4568 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4569 struct nft_expr *expr;
4573 if (!(flags & NFT_SET_EXPR)) {
4575 goto err_set_expr_alloc;
4578 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4579 if (i == NFT_SET_EXPR_MAX) {
4581 goto err_set_expr_alloc;
4583 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4585 goto err_set_expr_alloc;
4587 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4589 err = PTR_ERR(expr);
4590 goto err_set_expr_alloc;
4592 set->exprs[i++] = expr;
4597 set->handle = nf_tables_alloc_handle(table);
4599 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4601 goto err_set_expr_alloc;
4603 list_add_tail_rcu(&set->list, &table->sets);
4608 for (i = 0; i < set->num_exprs; i++)
4609 nft_expr_destroy(&ctx, set->exprs[i]);
4619 struct nft_set_elem_catchall {
4620 struct list_head list;
4621 struct rcu_head rcu;
4625 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4626 struct nft_set *set)
4628 struct nft_set_elem_catchall *next, *catchall;
4630 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4631 list_del_rcu(&catchall->list);
4632 nft_set_elem_destroy(set, catchall->elem, true);
4633 kfree_rcu(catchall, rcu);
4637 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4641 if (WARN_ON(set->use > 0))
4644 for (i = 0; i < set->num_exprs; i++)
4645 nft_expr_destroy(ctx, set->exprs[i]);
4647 set->ops->destroy(set);
4648 nft_set_catchall_destroy(ctx, set);
4653 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4654 const struct nlattr * const nla[])
4656 struct netlink_ext_ack *extack = info->extack;
4657 u8 genmask = nft_genmask_next(info->net);
4658 u8 family = info->nfmsg->nfgen_family;
4659 struct net *net = info->net;
4660 const struct nlattr *attr;
4661 struct nft_table *table;
4662 struct nft_set *set;
4665 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4666 return -EAFNOSUPPORT;
4668 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4669 genmask, NETLINK_CB(skb).portid);
4670 if (IS_ERR(table)) {
4671 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4672 return PTR_ERR(table);
4675 if (nla[NFTA_SET_HANDLE]) {
4676 attr = nla[NFTA_SET_HANDLE];
4677 set = nft_set_lookup_byhandle(table, attr, genmask);
4679 attr = nla[NFTA_SET_NAME];
4680 set = nft_set_lookup(table, attr, genmask);
4684 NL_SET_BAD_ATTR(extack, attr);
4685 return PTR_ERR(set);
4688 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4689 atomic_read(&set->nelems) > 0)) {
4690 NL_SET_BAD_ATTR(extack, attr);
4694 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4696 return nft_delset(&ctx, set);
4699 static int nft_validate_register_store(const struct nft_ctx *ctx,
4700 enum nft_registers reg,
4701 const struct nft_data *data,
4702 enum nft_data_types type,
4705 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4706 struct nft_set *set,
4707 struct nft_set_elem *elem)
4709 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4710 enum nft_registers dreg;
4712 dreg = nft_type_to_reg(set->dtype);
4713 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4714 set->dtype == NFT_DATA_VERDICT ?
4715 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4719 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4720 struct nft_set *set,
4721 const struct nft_set_iter *iter,
4722 struct nft_set_elem *elem)
4724 return nft_setelem_data_validate(ctx, set, elem);
4727 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4728 struct nft_set *set)
4730 u8 genmask = nft_genmask_next(ctx->net);
4731 struct nft_set_elem_catchall *catchall;
4732 struct nft_set_elem elem;
4733 struct nft_set_ext *ext;
4736 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4737 ext = nft_set_elem_ext(set, catchall->elem);
4738 if (!nft_set_elem_active(ext, genmask))
4741 elem.priv = catchall->elem;
4742 ret = nft_setelem_data_validate(ctx, set, &elem);
4750 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4751 struct nft_set_binding *binding)
4753 struct nft_set_binding *i;
4754 struct nft_set_iter iter;
4756 if (set->use == UINT_MAX)
4759 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4762 if (binding->flags & NFT_SET_MAP) {
4763 /* If the set is already bound to the same chain all
4764 * jumps are already validated for that chain.
4766 list_for_each_entry(i, &set->bindings, list) {
4767 if (i->flags & NFT_SET_MAP &&
4768 i->chain == binding->chain)
4772 iter.genmask = nft_genmask_next(ctx->net);
4776 iter.fn = nf_tables_bind_check_setelem;
4778 set->ops->walk(ctx, set, &iter);
4780 iter.err = nft_set_catchall_bind_check(ctx, set);
4786 binding->chain = ctx->chain;
4787 list_add_tail_rcu(&binding->list, &set->bindings);
4788 nft_set_trans_bind(ctx, set);
4793 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4795 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4796 struct nft_set_binding *binding, bool event)
4798 list_del_rcu(&binding->list);
4800 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4801 list_del_rcu(&set->list);
4803 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4808 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4809 struct nft_set_binding *binding,
4810 enum nft_trans_phase phase)
4813 case NFT_TRANS_PREPARE:
4816 case NFT_TRANS_ABORT:
4817 case NFT_TRANS_RELEASE:
4821 nf_tables_unbind_set(ctx, set, binding,
4822 phase == NFT_TRANS_COMMIT);
4825 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4827 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4829 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4830 nft_set_destroy(ctx, set);
4832 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4834 const struct nft_set_ext_type nft_set_ext_types[] = {
4835 [NFT_SET_EXT_KEY] = {
4836 .align = __alignof__(u32),
4838 [NFT_SET_EXT_DATA] = {
4839 .align = __alignof__(u32),
4841 [NFT_SET_EXT_EXPRESSIONS] = {
4842 .align = __alignof__(struct nft_set_elem_expr),
4844 [NFT_SET_EXT_OBJREF] = {
4845 .len = sizeof(struct nft_object *),
4846 .align = __alignof__(struct nft_object *),
4848 [NFT_SET_EXT_FLAGS] = {
4850 .align = __alignof__(u8),
4852 [NFT_SET_EXT_TIMEOUT] = {
4854 .align = __alignof__(u64),
4856 [NFT_SET_EXT_EXPIRATION] = {
4858 .align = __alignof__(u64),
4860 [NFT_SET_EXT_USERDATA] = {
4861 .len = sizeof(struct nft_userdata),
4862 .align = __alignof__(struct nft_userdata),
4864 [NFT_SET_EXT_KEY_END] = {
4865 .align = __alignof__(u32),
4873 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4874 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4875 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4876 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4877 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4878 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4879 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4880 .len = NFT_USERDATA_MAXLEN },
4881 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4882 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4883 .len = NFT_OBJ_MAXNAMELEN - 1 },
4884 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4885 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4888 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4889 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4890 .len = NFT_TABLE_MAXNAMELEN - 1 },
4891 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4892 .len = NFT_SET_MAXNAMELEN - 1 },
4893 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4894 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4897 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4898 const struct nft_set *set,
4899 const struct nft_set_ext *ext)
4901 struct nft_set_elem_expr *elem_expr;
4902 u32 size, num_exprs = 0;
4903 struct nft_expr *expr;
4904 struct nlattr *nest;
4906 elem_expr = nft_set_ext_expr(ext);
4907 nft_setelem_expr_foreach(expr, elem_expr, size)
4910 if (num_exprs == 1) {
4911 expr = nft_setelem_expr_at(elem_expr, 0);
4912 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4916 } else if (num_exprs > 1) {
4917 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4919 goto nla_put_failure;
4921 nft_setelem_expr_foreach(expr, elem_expr, size) {
4922 expr = nft_setelem_expr_at(elem_expr, size);
4923 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4924 goto nla_put_failure;
4926 nla_nest_end(skb, nest);
4934 static int nf_tables_fill_setelem(struct sk_buff *skb,
4935 const struct nft_set *set,
4936 const struct nft_set_elem *elem)
4938 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4939 unsigned char *b = skb_tail_pointer(skb);
4940 struct nlattr *nest;
4942 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4944 goto nla_put_failure;
4946 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4947 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4948 NFT_DATA_VALUE, set->klen) < 0)
4949 goto nla_put_failure;
4951 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4952 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4953 NFT_DATA_VALUE, set->klen) < 0)
4954 goto nla_put_failure;
4956 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4957 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4958 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4960 goto nla_put_failure;
4962 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4963 nft_set_elem_expr_dump(skb, set, ext))
4964 goto nla_put_failure;
4966 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4967 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4968 (*nft_set_ext_obj(ext))->key.name) < 0)
4969 goto nla_put_failure;
4971 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4972 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4973 htonl(*nft_set_ext_flags(ext))))
4974 goto nla_put_failure;
4976 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4977 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4978 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4980 goto nla_put_failure;
4982 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4983 u64 expires, now = get_jiffies_64();
4985 expires = *nft_set_ext_expiration(ext);
4986 if (time_before64(now, expires))
4991 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4992 nf_jiffies64_to_msecs(expires),
4994 goto nla_put_failure;
4997 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4998 struct nft_userdata *udata;
5000 udata = nft_set_ext_userdata(ext);
5001 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
5002 udata->len + 1, udata->data))
5003 goto nla_put_failure;
5006 nla_nest_end(skb, nest);
5014 struct nft_set_dump_args {
5015 const struct netlink_callback *cb;
5016 struct nft_set_iter iter;
5017 struct sk_buff *skb;
5020 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5021 struct nft_set *set,
5022 const struct nft_set_iter *iter,
5023 struct nft_set_elem *elem)
5025 struct nft_set_dump_args *args;
5027 args = container_of(iter, struct nft_set_dump_args, iter);
5028 return nf_tables_fill_setelem(args->skb, set, elem);
5031 struct nft_set_dump_ctx {
5032 const struct nft_set *set;
5036 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5037 const struct nft_set *set)
5039 struct nft_set_elem_catchall *catchall;
5040 u8 genmask = nft_genmask_cur(net);
5041 struct nft_set_elem elem;
5042 struct nft_set_ext *ext;
5045 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5046 ext = nft_set_elem_ext(set, catchall->elem);
5047 if (!nft_set_elem_active(ext, genmask) ||
5048 nft_set_elem_expired(ext))
5051 elem.priv = catchall->elem;
5052 ret = nf_tables_fill_setelem(skb, set, &elem);
5059 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5061 struct nft_set_dump_ctx *dump_ctx = cb->data;
5062 struct net *net = sock_net(skb->sk);
5063 struct nftables_pernet *nft_net;
5064 struct nft_table *table;
5065 struct nft_set *set;
5066 struct nft_set_dump_args args;
5067 bool set_found = false;
5068 struct nlmsghdr *nlh;
5069 struct nlattr *nest;
5074 nft_net = nft_pernet(net);
5075 cb->seq = READ_ONCE(nft_net->base_seq);
5077 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5078 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5079 dump_ctx->ctx.family != table->family)
5082 if (table != dump_ctx->ctx.table)
5085 list_for_each_entry_rcu(set, &table->sets, list) {
5086 if (set == dump_ctx->set) {
5099 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5100 portid = NETLINK_CB(cb->skb).portid;
5101 seq = cb->nlh->nlmsg_seq;
5103 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5104 table->family, NFNETLINK_V0, nft_base_seq(net));
5106 goto nla_put_failure;
5108 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5109 goto nla_put_failure;
5110 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5111 goto nla_put_failure;
5113 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5115 goto nla_put_failure;
5119 args.iter.genmask = nft_genmask_cur(net);
5120 args.iter.skip = cb->args[0];
5121 args.iter.count = 0;
5123 args.iter.fn = nf_tables_dump_setelem;
5124 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5126 if (!args.iter.err && args.iter.count == cb->args[0])
5127 args.iter.err = nft_set_catchall_dump(net, skb, set);
5130 nla_nest_end(skb, nest);
5131 nlmsg_end(skb, nlh);
5133 if (args.iter.err && args.iter.err != -EMSGSIZE)
5134 return args.iter.err;
5135 if (args.iter.count == cb->args[0])
5138 cb->args[0] = args.iter.count;
5146 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5148 struct nft_set_dump_ctx *dump_ctx = cb->data;
5150 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5152 return cb->data ? 0 : -ENOMEM;
5155 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5161 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5162 const struct nft_ctx *ctx, u32 seq,
5163 u32 portid, int event, u16 flags,
5164 const struct nft_set *set,
5165 const struct nft_set_elem *elem)
5167 struct nlmsghdr *nlh;
5168 struct nlattr *nest;
5171 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5172 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5173 NFNETLINK_V0, nft_base_seq(ctx->net));
5175 goto nla_put_failure;
5177 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5178 goto nla_put_failure;
5179 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5180 goto nla_put_failure;
5182 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5184 goto nla_put_failure;
5186 err = nf_tables_fill_setelem(skb, set, elem);
5188 goto nla_put_failure;
5190 nla_nest_end(skb, nest);
5192 nlmsg_end(skb, nlh);
5196 nlmsg_trim(skb, nlh);
5200 static int nft_setelem_parse_flags(const struct nft_set *set,
5201 const struct nlattr *attr, u32 *flags)
5206 *flags = ntohl(nla_get_be32(attr));
5207 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5209 if (!(set->flags & NFT_SET_INTERVAL) &&
5210 *flags & NFT_SET_ELEM_INTERVAL_END)
5212 if ((*flags & (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL)) ==
5213 (NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5219 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5220 struct nft_data *key, struct nlattr *attr)
5222 struct nft_data_desc desc = {
5223 .type = NFT_DATA_VALUE,
5224 .size = NFT_DATA_VALUE_MAXLEN,
5228 return nft_data_init(ctx, key, &desc, attr);
5231 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5232 struct nft_data_desc *desc,
5233 struct nft_data *data,
5234 struct nlattr *attr)
5238 if (set->dtype == NFT_DATA_VERDICT)
5239 dtype = NFT_DATA_VERDICT;
5241 dtype = NFT_DATA_VALUE;
5244 desc->size = NFT_DATA_VALUE_MAXLEN;
5245 desc->len = set->dlen;
5246 desc->flags = NFT_DATA_DESC_SETELEM;
5248 return nft_data_init(ctx, data, desc, attr);
5251 static void *nft_setelem_catchall_get(const struct net *net,
5252 const struct nft_set *set)
5254 struct nft_set_elem_catchall *catchall;
5255 u8 genmask = nft_genmask_cur(net);
5256 struct nft_set_ext *ext;
5259 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5260 ext = nft_set_elem_ext(set, catchall->elem);
5261 if (!nft_set_elem_active(ext, genmask) ||
5262 nft_set_elem_expired(ext))
5265 priv = catchall->elem;
5272 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5273 struct nft_set_elem *elem, u32 flags)
5277 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5278 priv = set->ops->get(ctx->net, set, elem, flags);
5280 return PTR_ERR(priv);
5282 priv = nft_setelem_catchall_get(ctx->net, set);
5291 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5292 const struct nlattr *attr)
5294 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5295 struct nft_set_elem elem;
5296 struct sk_buff *skb;
5300 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5301 nft_set_elem_policy, NULL);
5305 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5309 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5312 if (nla[NFTA_SET_ELEM_KEY]) {
5313 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5314 nla[NFTA_SET_ELEM_KEY]);
5319 if (nla[NFTA_SET_ELEM_KEY_END]) {
5320 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5321 nla[NFTA_SET_ELEM_KEY_END]);
5326 err = nft_setelem_get(ctx, set, &elem, flags);
5331 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5335 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5336 NFT_MSG_NEWSETELEM, 0, set, &elem);
5338 goto err_fill_setelem;
5340 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5347 /* called with rcu_read_lock held */
5348 static int nf_tables_getsetelem(struct sk_buff *skb,
5349 const struct nfnl_info *info,
5350 const struct nlattr * const nla[])
5352 struct netlink_ext_ack *extack = info->extack;
5353 u8 genmask = nft_genmask_cur(info->net);
5354 u8 family = info->nfmsg->nfgen_family;
5355 struct net *net = info->net;
5356 struct nft_table *table;
5357 struct nft_set *set;
5358 struct nlattr *attr;
5362 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5363 genmask, NETLINK_CB(skb).portid);
5364 if (IS_ERR(table)) {
5365 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5366 return PTR_ERR(table);
5369 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5371 return PTR_ERR(set);
5373 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5375 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5376 struct netlink_dump_control c = {
5377 .start = nf_tables_dump_set_start,
5378 .dump = nf_tables_dump_set,
5379 .done = nf_tables_dump_set_done,
5380 .module = THIS_MODULE,
5382 struct nft_set_dump_ctx dump_ctx = {
5388 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5391 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5394 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5395 err = nft_get_set_elem(&ctx, set, attr);
5397 NL_SET_BAD_ATTR(extack, attr);
5405 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5406 const struct nft_set *set,
5407 const struct nft_set_elem *elem,
5410 struct nftables_pernet *nft_net;
5411 struct net *net = ctx->net;
5412 u32 portid = ctx->portid;
5413 struct sk_buff *skb;
5417 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5420 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5424 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5425 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5427 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5434 nft_net = nft_pernet(net);
5435 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5438 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5441 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5443 struct nft_set *set)
5445 struct nft_trans *trans;
5447 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5451 nft_trans_elem_set(trans) = set;
5455 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5456 const struct nft_set *set,
5457 const struct nlattr *attr)
5459 struct nft_expr *expr;
5462 expr = nft_expr_init(ctx, attr);
5467 if (expr->ops->type->flags & NFT_EXPR_GC) {
5468 if (set->flags & NFT_SET_TIMEOUT)
5469 goto err_set_elem_expr;
5470 if (!set->ops->gc_init)
5471 goto err_set_elem_expr;
5472 set->ops->gc_init(set);
5478 nft_expr_destroy(ctx, expr);
5479 return ERR_PTR(err);
5482 static int nft_set_ext_check(const struct nft_set_ext_tmpl *tmpl, u8 id, u32 len)
5484 len += nft_set_ext_types[id].len;
5485 if (len > tmpl->ext_len[id] ||
5492 static int nft_set_ext_memcpy(const struct nft_set_ext_tmpl *tmpl, u8 id,
5493 void *to, const void *from, u32 len)
5495 if (nft_set_ext_check(tmpl, id, len) < 0)
5498 memcpy(to, from, len);
5503 void *nft_set_elem_init(const struct nft_set *set,
5504 const struct nft_set_ext_tmpl *tmpl,
5505 const u32 *key, const u32 *key_end,
5506 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5508 struct nft_set_ext *ext;
5511 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5513 return ERR_PTR(-ENOMEM);
5515 ext = nft_set_elem_ext(set, elem);
5516 nft_set_ext_init(ext, tmpl);
5518 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
5519 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY,
5520 nft_set_ext_key(ext), key, set->klen) < 0)
5523 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
5524 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_KEY_END,
5525 nft_set_ext_key_end(ext), key_end, set->klen) < 0)
5528 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
5529 nft_set_ext_memcpy(tmpl, NFT_SET_EXT_DATA,
5530 nft_set_ext_data(ext), data, set->dlen) < 0)
5533 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5534 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5535 if (expiration == 0)
5536 *nft_set_ext_expiration(ext) += timeout;
5538 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5539 *nft_set_ext_timeout(ext) = timeout;
5546 return ERR_PTR(-EINVAL);
5549 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5550 struct nft_expr *expr)
5552 if (expr->ops->destroy_clone) {
5553 expr->ops->destroy_clone(ctx, expr);
5554 module_put(expr->ops->type->owner);
5556 nf_tables_expr_destroy(ctx, expr);
5560 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5561 struct nft_set_elem_expr *elem_expr)
5563 struct nft_expr *expr;
5566 nft_setelem_expr_foreach(expr, elem_expr, size)
5567 __nft_set_elem_expr_destroy(ctx, expr);
5570 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5573 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5574 struct nft_ctx ctx = {
5575 .net = read_pnet(&set->net),
5576 .family = set->table->family,
5579 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5580 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5581 nft_data_release(nft_set_ext_data(ext), set->dtype);
5582 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5583 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5585 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5586 (*nft_set_ext_obj(ext))->use--;
5589 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5591 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5592 * with the refcounting from the preparation phase.
5594 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5595 const struct nft_set *set, void *elem)
5597 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5599 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5600 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5605 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5606 struct nft_expr *expr_array[])
5608 struct nft_expr *expr;
5611 for (i = 0; i < set->num_exprs; i++) {
5612 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5616 err = nft_expr_clone(expr, set->exprs[i]);
5621 expr_array[i] = expr;
5627 for (k = i - 1; k >= 0; k--)
5628 nft_expr_destroy(ctx, expr_array[k]);
5633 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5634 const struct nft_set_ext_tmpl *tmpl,
5635 const struct nft_set_ext *ext,
5636 struct nft_expr *expr_array[],
5639 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5640 u32 len = sizeof(struct nft_set_elem_expr);
5641 struct nft_expr *expr;
5647 for (i = 0; i < num_exprs; i++)
5648 len += expr_array[i]->ops->size;
5650 if (nft_set_ext_check(tmpl, NFT_SET_EXT_EXPRESSIONS, len) < 0)
5653 for (i = 0; i < num_exprs; i++) {
5654 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5655 err = nft_expr_clone(expr, expr_array[i]);
5657 goto err_elem_expr_setup;
5659 elem_expr->size += expr_array[i]->ops->size;
5660 nft_expr_destroy(ctx, expr_array[i]);
5661 expr_array[i] = NULL;
5666 err_elem_expr_setup:
5667 for (; i < num_exprs; i++) {
5668 nft_expr_destroy(ctx, expr_array[i]);
5669 expr_array[i] = NULL;
5675 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5676 const struct nft_set *set)
5678 struct nft_set_elem_catchall *catchall;
5679 u8 genmask = nft_genmask_cur(net);
5680 struct nft_set_ext *ext;
5682 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5683 ext = nft_set_elem_ext(set, catchall->elem);
5684 if (nft_set_elem_active(ext, genmask) &&
5685 !nft_set_elem_expired(ext))
5691 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5693 void *nft_set_catchall_gc(const struct nft_set *set)
5695 struct nft_set_elem_catchall *catchall, *next;
5696 struct nft_set_ext *ext;
5699 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5700 ext = nft_set_elem_ext(set, catchall->elem);
5702 if (!nft_set_elem_expired(ext) ||
5703 nft_set_elem_mark_busy(ext))
5706 elem = catchall->elem;
5707 list_del_rcu(&catchall->list);
5708 kfree_rcu(catchall, rcu);
5714 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5716 static int nft_setelem_catchall_insert(const struct net *net,
5717 struct nft_set *set,
5718 const struct nft_set_elem *elem,
5719 struct nft_set_ext **pext)
5721 struct nft_set_elem_catchall *catchall;
5722 u8 genmask = nft_genmask_next(net);
5723 struct nft_set_ext *ext;
5725 list_for_each_entry(catchall, &set->catchall_list, list) {
5726 ext = nft_set_elem_ext(set, catchall->elem);
5727 if (nft_set_elem_active(ext, genmask)) {
5733 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5737 catchall->elem = elem->priv;
5738 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5743 static int nft_setelem_insert(const struct net *net,
5744 struct nft_set *set,
5745 const struct nft_set_elem *elem,
5746 struct nft_set_ext **ext, unsigned int flags)
5750 if (flags & NFT_SET_ELEM_CATCHALL)
5751 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5753 ret = set->ops->insert(net, set, elem, ext);
5758 static bool nft_setelem_is_catchall(const struct nft_set *set,
5759 const struct nft_set_elem *elem)
5761 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5763 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5764 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5770 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5771 struct nft_set_elem *elem)
5773 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5775 if (nft_setelem_is_catchall(set, elem)) {
5776 nft_set_elem_change_active(net, set, ext);
5777 nft_set_elem_clear_busy(ext);
5779 set->ops->activate(net, set, elem);
5783 static int nft_setelem_catchall_deactivate(const struct net *net,
5784 struct nft_set *set,
5785 struct nft_set_elem *elem)
5787 struct nft_set_elem_catchall *catchall;
5788 struct nft_set_ext *ext;
5790 list_for_each_entry(catchall, &set->catchall_list, list) {
5791 ext = nft_set_elem_ext(set, catchall->elem);
5792 if (!nft_is_active(net, ext) ||
5793 nft_set_elem_mark_busy(ext))
5797 elem->priv = catchall->elem;
5798 nft_set_elem_change_active(net, set, ext);
5805 static int __nft_setelem_deactivate(const struct net *net,
5806 struct nft_set *set,
5807 struct nft_set_elem *elem)
5811 priv = set->ops->deactivate(net, set, elem);
5822 static int nft_setelem_deactivate(const struct net *net,
5823 struct nft_set *set,
5824 struct nft_set_elem *elem, u32 flags)
5828 if (flags & NFT_SET_ELEM_CATCHALL)
5829 ret = nft_setelem_catchall_deactivate(net, set, elem);
5831 ret = __nft_setelem_deactivate(net, set, elem);
5836 static void nft_setelem_catchall_remove(const struct net *net,
5837 const struct nft_set *set,
5838 const struct nft_set_elem *elem)
5840 struct nft_set_elem_catchall *catchall, *next;
5842 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5843 if (catchall->elem == elem->priv) {
5844 list_del_rcu(&catchall->list);
5845 kfree_rcu(catchall, rcu);
5851 static void nft_setelem_remove(const struct net *net,
5852 const struct nft_set *set,
5853 const struct nft_set_elem *elem)
5855 if (nft_setelem_is_catchall(set, elem))
5856 nft_setelem_catchall_remove(net, set, elem);
5858 set->ops->remove(net, set, elem);
5861 static bool nft_setelem_valid_key_end(const struct nft_set *set,
5862 struct nlattr **nla, u32 flags)
5864 if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
5865 (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
5866 if (flags & NFT_SET_ELEM_INTERVAL_END)
5869 if (nla[NFTA_SET_ELEM_KEY_END] &&
5870 flags & NFT_SET_ELEM_CATCHALL)
5873 if (nla[NFTA_SET_ELEM_KEY_END])
5880 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5881 const struct nlattr *attr, u32 nlmsg_flags)
5883 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5884 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5885 u8 genmask = nft_genmask_next(ctx->net);
5886 u32 flags = 0, size = 0, num_exprs = 0;
5887 struct nft_set_ext_tmpl tmpl;
5888 struct nft_set_ext *ext, *ext2;
5889 struct nft_set_elem elem;
5890 struct nft_set_binding *binding;
5891 struct nft_object *obj = NULL;
5892 struct nft_userdata *udata;
5893 struct nft_data_desc desc;
5894 enum nft_registers dreg;
5895 struct nft_trans *trans;
5901 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5902 nft_set_elem_policy, NULL);
5906 nft_set_ext_prepare(&tmpl);
5908 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5912 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5916 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5921 if (set->flags & NFT_SET_MAP) {
5922 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5923 !(flags & NFT_SET_ELEM_INTERVAL_END))
5926 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5930 if (set->flags & NFT_SET_OBJECT) {
5931 if (!nla[NFTA_SET_ELEM_OBJREF] &&
5932 !(flags & NFT_SET_ELEM_INTERVAL_END))
5935 if (nla[NFTA_SET_ELEM_OBJREF])
5939 if (!nft_setelem_valid_key_end(set, nla, flags))
5942 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5943 (nla[NFTA_SET_ELEM_DATA] ||
5944 nla[NFTA_SET_ELEM_OBJREF] ||
5945 nla[NFTA_SET_ELEM_TIMEOUT] ||
5946 nla[NFTA_SET_ELEM_EXPIRATION] ||
5947 nla[NFTA_SET_ELEM_USERDATA] ||
5948 nla[NFTA_SET_ELEM_EXPR] ||
5949 nla[NFTA_SET_ELEM_KEY_END] ||
5950 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5954 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5955 if (!(set->flags & NFT_SET_TIMEOUT))
5957 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5961 } else if (set->flags & NFT_SET_TIMEOUT &&
5962 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
5963 timeout = set->timeout;
5967 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5968 if (!(set->flags & NFT_SET_TIMEOUT))
5970 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5976 if (nla[NFTA_SET_ELEM_EXPR]) {
5977 struct nft_expr *expr;
5979 if (set->num_exprs && set->num_exprs != 1)
5982 expr = nft_set_elem_expr_alloc(ctx, set,
5983 nla[NFTA_SET_ELEM_EXPR]);
5985 return PTR_ERR(expr);
5987 expr_array[0] = expr;
5990 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5992 goto err_set_elem_expr;
5994 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5995 struct nft_expr *expr;
6000 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
6001 if (i == NFT_SET_EXPR_MAX ||
6002 (set->num_exprs && set->num_exprs == i)) {
6004 goto err_set_elem_expr;
6006 if (nla_type(tmp) != NFTA_LIST_ELEM) {
6008 goto err_set_elem_expr;
6010 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
6012 err = PTR_ERR(expr);
6013 goto err_set_elem_expr;
6015 expr_array[i] = expr;
6018 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
6020 goto err_set_elem_expr;
6024 if (set->num_exprs && set->num_exprs != i) {
6026 goto err_set_elem_expr;
6028 } else if (set->num_exprs > 0 &&
6029 !(flags & NFT_SET_ELEM_INTERVAL_END)) {
6030 err = nft_set_elem_expr_clone(ctx, set, expr_array);
6032 goto err_set_elem_expr_clone;
6034 num_exprs = set->num_exprs;
6037 if (nla[NFTA_SET_ELEM_KEY]) {
6038 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6039 nla[NFTA_SET_ELEM_KEY]);
6041 goto err_set_elem_expr;
6043 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6048 if (nla[NFTA_SET_ELEM_KEY_END]) {
6049 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6050 nla[NFTA_SET_ELEM_KEY_END]);
6054 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6056 goto err_parse_key_end;
6060 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
6062 goto err_parse_key_end;
6064 if (timeout != set->timeout) {
6065 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
6067 goto err_parse_key_end;
6072 for (i = 0; i < num_exprs; i++)
6073 size += expr_array[i]->ops->size;
6075 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
6076 sizeof(struct nft_set_elem_expr) + size);
6078 goto err_parse_key_end;
6081 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
6082 obj = nft_obj_lookup(ctx->net, ctx->table,
6083 nla[NFTA_SET_ELEM_OBJREF],
6084 set->objtype, genmask);
6087 goto err_parse_key_end;
6089 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
6091 goto err_parse_key_end;
6094 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
6095 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
6096 nla[NFTA_SET_ELEM_DATA]);
6098 goto err_parse_key_end;
6100 dreg = nft_type_to_reg(set->dtype);
6101 list_for_each_entry(binding, &set->bindings, list) {
6102 struct nft_ctx bind_ctx = {
6104 .family = ctx->family,
6105 .table = ctx->table,
6106 .chain = (struct nft_chain *)binding->chain,
6109 if (!(binding->flags & NFT_SET_MAP))
6112 err = nft_validate_register_store(&bind_ctx, dreg,
6114 desc.type, desc.len);
6116 goto err_parse_data;
6118 if (desc.type == NFT_DATA_VERDICT &&
6119 (elem.data.val.verdict.code == NFT_GOTO ||
6120 elem.data.val.verdict.code == NFT_JUMP))
6121 nft_validate_state_update(ctx->net,
6125 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6127 goto err_parse_data;
6130 /* The full maximum length of userdata can exceed the maximum
6131 * offset value (U8_MAX) for following extensions, therefor it
6132 * must be the last extension added.
6135 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6136 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6138 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6141 goto err_parse_data;
6145 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6146 elem.key_end.val.data, elem.data.val.data,
6147 timeout, expiration, GFP_KERNEL_ACCOUNT);
6148 if (IS_ERR(elem.priv)) {
6149 err = PTR_ERR(elem.priv);
6150 goto err_parse_data;
6153 ext = nft_set_elem_ext(set, elem.priv);
6155 *nft_set_ext_flags(ext) = flags;
6158 if (nft_set_ext_check(&tmpl, NFT_SET_EXT_USERDATA, ulen) < 0) {
6160 goto err_elem_userdata;
6162 udata = nft_set_ext_userdata(ext);
6163 udata->len = ulen - 1;
6164 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6167 *nft_set_ext_obj(ext) = obj;
6170 err = nft_set_elem_expr_setup(ctx, &tmpl, ext, expr_array, num_exprs);
6174 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6175 if (trans == NULL) {
6180 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6182 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6184 if (err == -EEXIST) {
6185 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6186 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6187 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6188 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6189 goto err_element_clash;
6190 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6191 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6192 memcmp(nft_set_ext_data(ext),
6193 nft_set_ext_data(ext2), set->dlen) != 0) ||
6194 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6195 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6196 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6197 goto err_element_clash;
6198 else if (!(nlmsg_flags & NLM_F_EXCL))
6200 } else if (err == -ENOTEMPTY) {
6201 /* ENOTEMPTY reports overlapping between this element
6202 * and an existing one.
6206 goto err_element_clash;
6209 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6210 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6215 nft_trans_elem(trans) = elem;
6216 nft_trans_commit_list_add_tail(ctx->net, trans);
6220 nft_setelem_remove(ctx->net, set, &elem);
6227 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6229 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6230 nft_data_release(&elem.data.val, desc.type);
6232 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6234 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6236 for (i = 0; i < num_exprs && expr_array[i]; i++)
6237 nft_expr_destroy(ctx, expr_array[i]);
6238 err_set_elem_expr_clone:
6242 static int nf_tables_newsetelem(struct sk_buff *skb,
6243 const struct nfnl_info *info,
6244 const struct nlattr * const nla[])
6246 struct nftables_pernet *nft_net = nft_pernet(info->net);
6247 struct netlink_ext_ack *extack = info->extack;
6248 u8 genmask = nft_genmask_next(info->net);
6249 u8 family = info->nfmsg->nfgen_family;
6250 struct net *net = info->net;
6251 const struct nlattr *attr;
6252 struct nft_table *table;
6253 struct nft_set *set;
6257 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6260 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6261 genmask, NETLINK_CB(skb).portid);
6262 if (IS_ERR(table)) {
6263 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6264 return PTR_ERR(table);
6267 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6268 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6270 return PTR_ERR(set);
6272 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6275 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6277 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6278 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6280 NL_SET_BAD_ATTR(extack, attr);
6285 if (nft_net->validate_state == NFT_VALIDATE_DO)
6286 return nft_table_validate(net, table);
6292 * nft_data_hold - hold a nft_data item
6294 * @data: struct nft_data to release
6295 * @type: type of data
6297 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6298 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6299 * NFT_GOTO verdicts. This function must be called on active data objects
6300 * from the second phase of the commit protocol.
6302 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6304 struct nft_chain *chain;
6305 struct nft_rule *rule;
6307 if (type == NFT_DATA_VERDICT) {
6308 switch (data->verdict.code) {
6311 chain = data->verdict.chain;
6314 if (!nft_chain_is_bound(chain))
6317 chain->table->use++;
6318 list_for_each_entry(rule, &chain->rules, list)
6321 nft_chain_add(chain->table, chain);
6327 static void nft_setelem_data_activate(const struct net *net,
6328 const struct nft_set *set,
6329 struct nft_set_elem *elem)
6331 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6333 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6334 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6335 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6336 (*nft_set_ext_obj(ext))->use++;
6339 static void nft_setelem_data_deactivate(const struct net *net,
6340 const struct nft_set *set,
6341 struct nft_set_elem *elem)
6343 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6345 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6346 nft_data_release(nft_set_ext_data(ext), set->dtype);
6347 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6348 (*nft_set_ext_obj(ext))->use--;
6351 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6352 const struct nlattr *attr)
6354 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6355 struct nft_set_ext_tmpl tmpl;
6356 struct nft_set_elem elem;
6357 struct nft_set_ext *ext;
6358 struct nft_trans *trans;
6362 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6363 nft_set_elem_policy, NULL);
6367 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6371 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6374 if (!nft_setelem_valid_key_end(set, nla, flags))
6377 nft_set_ext_prepare(&tmpl);
6380 err = nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6385 if (nla[NFTA_SET_ELEM_KEY]) {
6386 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6387 nla[NFTA_SET_ELEM_KEY]);
6391 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6396 if (nla[NFTA_SET_ELEM_KEY_END]) {
6397 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6398 nla[NFTA_SET_ELEM_KEY_END]);
6402 err = nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6404 goto fail_elem_key_end;
6408 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6409 elem.key_end.val.data, NULL, 0, 0,
6410 GFP_KERNEL_ACCOUNT);
6411 if (IS_ERR(elem.priv)) {
6412 err = PTR_ERR(elem.priv);
6413 goto fail_elem_key_end;
6416 ext = nft_set_elem_ext(set, elem.priv);
6418 *nft_set_ext_flags(ext) = flags;
6420 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6424 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6428 nft_setelem_data_deactivate(ctx->net, set, &elem);
6430 nft_trans_elem(trans) = elem;
6431 nft_trans_commit_list_add_tail(ctx->net, trans);
6439 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6441 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6445 static int nft_setelem_flush(const struct nft_ctx *ctx,
6446 struct nft_set *set,
6447 const struct nft_set_iter *iter,
6448 struct nft_set_elem *elem)
6450 struct nft_trans *trans;
6453 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6454 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6458 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6464 nft_setelem_data_deactivate(ctx->net, set, elem);
6465 nft_trans_elem_set(trans) = set;
6466 nft_trans_elem(trans) = *elem;
6467 nft_trans_commit_list_add_tail(ctx->net, trans);
6475 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6476 struct nft_set *set,
6477 struct nft_set_elem *elem)
6479 struct nft_trans *trans;
6481 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6482 sizeof(struct nft_trans_elem), GFP_KERNEL);
6486 nft_setelem_data_deactivate(ctx->net, set, elem);
6487 nft_trans_elem_set(trans) = set;
6488 nft_trans_elem(trans) = *elem;
6489 nft_trans_commit_list_add_tail(ctx->net, trans);
6494 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6495 struct nft_set *set)
6497 u8 genmask = nft_genmask_next(ctx->net);
6498 struct nft_set_elem_catchall *catchall;
6499 struct nft_set_elem elem;
6500 struct nft_set_ext *ext;
6503 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6504 ext = nft_set_elem_ext(set, catchall->elem);
6505 if (!nft_set_elem_active(ext, genmask) ||
6506 nft_set_elem_mark_busy(ext))
6509 elem.priv = catchall->elem;
6510 ret = __nft_set_catchall_flush(ctx, set, &elem);
6518 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6520 struct nft_set_iter iter = {
6522 .fn = nft_setelem_flush,
6525 set->ops->walk(ctx, set, &iter);
6527 iter.err = nft_set_catchall_flush(ctx, set);
6532 static int nf_tables_delsetelem(struct sk_buff *skb,
6533 const struct nfnl_info *info,
6534 const struct nlattr * const nla[])
6536 struct netlink_ext_ack *extack = info->extack;
6537 u8 genmask = nft_genmask_next(info->net);
6538 u8 family = info->nfmsg->nfgen_family;
6539 struct net *net = info->net;
6540 const struct nlattr *attr;
6541 struct nft_table *table;
6542 struct nft_set *set;
6546 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6547 genmask, NETLINK_CB(skb).portid);
6548 if (IS_ERR(table)) {
6549 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6550 return PTR_ERR(table);
6553 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6555 return PTR_ERR(set);
6556 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6559 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6561 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6562 return nft_set_flush(&ctx, set, genmask);
6564 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6565 err = nft_del_setelem(&ctx, set, attr);
6567 NL_SET_BAD_ATTR(extack, attr);
6574 void nft_set_gc_batch_release(struct rcu_head *rcu)
6576 struct nft_set_gc_batch *gcb;
6579 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6580 for (i = 0; i < gcb->head.cnt; i++)
6581 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6585 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6588 struct nft_set_gc_batch *gcb;
6590 gcb = kzalloc(sizeof(*gcb), gfp);
6593 gcb->head.set = set;
6602 * nft_register_obj- register nf_tables stateful object type
6603 * @obj_type: object type
6605 * Registers the object type for use with nf_tables. Returns zero on
6606 * success or a negative errno code otherwise.
6608 int nft_register_obj(struct nft_object_type *obj_type)
6610 if (obj_type->type == NFT_OBJECT_UNSPEC)
6613 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6614 list_add_rcu(&obj_type->list, &nf_tables_objects);
6615 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6618 EXPORT_SYMBOL_GPL(nft_register_obj);
6621 * nft_unregister_obj - unregister nf_tables object type
6622 * @obj_type: object type
6624 * Unregisters the object type for use with nf_tables.
6626 void nft_unregister_obj(struct nft_object_type *obj_type)
6628 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6629 list_del_rcu(&obj_type->list);
6630 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6632 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6634 struct nft_object *nft_obj_lookup(const struct net *net,
6635 const struct nft_table *table,
6636 const struct nlattr *nla, u32 objtype,
6639 struct nft_object_hash_key k = { .table = table };
6640 char search[NFT_OBJ_MAXNAMELEN];
6641 struct rhlist_head *tmp, *list;
6642 struct nft_object *obj;
6644 nla_strscpy(search, nla, sizeof(search));
6647 WARN_ON_ONCE(!rcu_read_lock_held() &&
6648 !lockdep_commit_lock_is_held(net));
6651 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6655 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6656 if (objtype == obj->ops->type->type &&
6657 nft_active_genmask(obj, genmask)) {
6664 return ERR_PTR(-ENOENT);
6666 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6668 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6669 const struct nlattr *nla,
6670 u32 objtype, u8 genmask)
6672 struct nft_object *obj;
6674 list_for_each_entry(obj, &table->objects, list) {
6675 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6676 objtype == obj->ops->type->type &&
6677 nft_active_genmask(obj, genmask))
6680 return ERR_PTR(-ENOENT);
6683 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6684 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6685 .len = NFT_TABLE_MAXNAMELEN - 1 },
6686 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6687 .len = NFT_OBJ_MAXNAMELEN - 1 },
6688 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6689 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6690 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6691 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6692 .len = NFT_USERDATA_MAXLEN },
6695 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6696 const struct nft_object_type *type,
6697 const struct nlattr *attr)
6700 const struct nft_object_ops *ops;
6701 struct nft_object *obj;
6704 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6709 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6710 type->policy, NULL);
6714 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6717 if (type->select_ops) {
6718 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6728 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6732 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6745 return ERR_PTR(err);
6748 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6749 struct nft_object *obj, bool reset)
6751 struct nlattr *nest;
6753 nest = nla_nest_start_noflag(skb, attr);
6755 goto nla_put_failure;
6756 if (obj->ops->dump(skb, obj, reset) < 0)
6757 goto nla_put_failure;
6758 nla_nest_end(skb, nest);
6765 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6767 const struct nft_object_type *type;
6769 list_for_each_entry(type, &nf_tables_objects, list) {
6770 if (objtype == type->type)
6776 static const struct nft_object_type *
6777 nft_obj_type_get(struct net *net, u32 objtype)
6779 const struct nft_object_type *type;
6781 type = __nft_obj_type_get(objtype);
6782 if (type != NULL && try_module_get(type->owner))
6785 lockdep_nfnl_nft_mutex_not_held();
6786 #ifdef CONFIG_MODULES
6788 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6789 return ERR_PTR(-EAGAIN);
6792 return ERR_PTR(-ENOENT);
6795 static int nf_tables_updobj(const struct nft_ctx *ctx,
6796 const struct nft_object_type *type,
6797 const struct nlattr *attr,
6798 struct nft_object *obj)
6800 struct nft_object *newobj;
6801 struct nft_trans *trans;
6804 if (!try_module_get(type->owner))
6807 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6808 sizeof(struct nft_trans_obj));
6812 newobj = nft_obj_init(ctx, type, attr);
6813 if (IS_ERR(newobj)) {
6814 err = PTR_ERR(newobj);
6815 goto err_free_trans;
6818 nft_trans_obj(trans) = obj;
6819 nft_trans_obj_update(trans) = true;
6820 nft_trans_obj_newobj(trans) = newobj;
6821 nft_trans_commit_list_add_tail(ctx->net, trans);
6828 module_put(type->owner);
6832 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6833 const struct nlattr * const nla[])
6835 struct netlink_ext_ack *extack = info->extack;
6836 u8 genmask = nft_genmask_next(info->net);
6837 u8 family = info->nfmsg->nfgen_family;
6838 const struct nft_object_type *type;
6839 struct net *net = info->net;
6840 struct nft_table *table;
6841 struct nft_object *obj;
6846 if (!nla[NFTA_OBJ_TYPE] ||
6847 !nla[NFTA_OBJ_NAME] ||
6848 !nla[NFTA_OBJ_DATA])
6851 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6852 NETLINK_CB(skb).portid);
6853 if (IS_ERR(table)) {
6854 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6855 return PTR_ERR(table);
6858 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6859 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6862 if (err != -ENOENT) {
6863 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6867 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6868 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6871 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6874 type = __nft_obj_type_get(objtype);
6875 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6877 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6880 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6882 type = nft_obj_type_get(net, objtype);
6884 return PTR_ERR(type);
6886 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6891 obj->key.table = table;
6892 obj->handle = nf_tables_alloc_handle(table);
6894 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6895 if (!obj->key.name) {
6900 if (nla[NFTA_OBJ_USERDATA]) {
6901 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6902 if (obj->udata == NULL)
6905 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6908 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6912 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6913 nft_objname_ht_params);
6917 list_add_tail_rcu(&obj->list, &table->objects);
6921 /* queued in transaction log */
6922 INIT_LIST_HEAD(&obj->list);
6927 kfree(obj->key.name);
6929 if (obj->ops->destroy)
6930 obj->ops->destroy(&ctx, obj);
6933 module_put(type->owner);
6937 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6938 u32 portid, u32 seq, int event, u32 flags,
6939 int family, const struct nft_table *table,
6940 struct nft_object *obj, bool reset)
6942 struct nlmsghdr *nlh;
6944 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6945 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6946 NFNETLINK_V0, nft_base_seq(net));
6948 goto nla_put_failure;
6950 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6951 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6952 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6953 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6954 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6955 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6957 goto nla_put_failure;
6960 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6961 goto nla_put_failure;
6963 nlmsg_end(skb, nlh);
6967 nlmsg_trim(skb, nlh);
6971 struct nft_obj_filter {
6976 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6978 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6979 const struct nft_table *table;
6980 unsigned int idx = 0, s_idx = cb->args[0];
6981 struct nft_obj_filter *filter = cb->data;
6982 struct net *net = sock_net(skb->sk);
6983 int family = nfmsg->nfgen_family;
6984 struct nftables_pernet *nft_net;
6985 struct nft_object *obj;
6988 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6992 nft_net = nft_pernet(net);
6993 cb->seq = READ_ONCE(nft_net->base_seq);
6995 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6996 if (family != NFPROTO_UNSPEC && family != table->family)
6999 list_for_each_entry_rcu(obj, &table->objects, list) {
7000 if (!nft_is_active(net, obj))
7005 memset(&cb->args[1], 0,
7006 sizeof(cb->args) - sizeof(cb->args[0]));
7007 if (filter && filter->table &&
7008 strcmp(filter->table, table->name))
7011 filter->type != NFT_OBJECT_UNSPEC &&
7012 obj->ops->type->type != filter->type)
7015 char *buf = kasprintf(GFP_ATOMIC,
7020 audit_log_nfcfg(buf,
7023 AUDIT_NFT_OP_OBJ_RESET,
7028 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
7031 NLM_F_MULTI | NLM_F_APPEND,
7032 table->family, table,
7036 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7048 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
7050 const struct nlattr * const *nla = cb->data;
7051 struct nft_obj_filter *filter = NULL;
7053 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
7054 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7058 if (nla[NFTA_OBJ_TABLE]) {
7059 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
7060 if (!filter->table) {
7066 if (nla[NFTA_OBJ_TYPE])
7067 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7074 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
7076 struct nft_obj_filter *filter = cb->data;
7079 kfree(filter->table);
7086 /* called with rcu_read_lock held */
7087 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
7088 const struct nlattr * const nla[])
7090 struct netlink_ext_ack *extack = info->extack;
7091 u8 genmask = nft_genmask_cur(info->net);
7092 u8 family = info->nfmsg->nfgen_family;
7093 const struct nft_table *table;
7094 struct net *net = info->net;
7095 struct nft_object *obj;
7096 struct sk_buff *skb2;
7101 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7102 struct netlink_dump_control c = {
7103 .start = nf_tables_dump_obj_start,
7104 .dump = nf_tables_dump_obj,
7105 .done = nf_tables_dump_obj_done,
7106 .module = THIS_MODULE,
7107 .data = (void *)nla,
7110 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7113 if (!nla[NFTA_OBJ_NAME] ||
7114 !nla[NFTA_OBJ_TYPE])
7117 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
7118 if (IS_ERR(table)) {
7119 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7120 return PTR_ERR(table);
7123 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7124 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
7126 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
7127 return PTR_ERR(obj);
7130 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7134 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7138 const struct nftables_pernet *nft_net;
7141 nft_net = nft_pernet(net);
7142 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7144 audit_log_nfcfg(buf,
7147 AUDIT_NFT_OP_OBJ_RESET,
7152 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7153 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7154 family, table, obj, reset);
7156 goto err_fill_obj_info;
7158 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7165 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7167 if (obj->ops->destroy)
7168 obj->ops->destroy(ctx, obj);
7170 module_put(obj->ops->type->owner);
7171 kfree(obj->key.name);
7176 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7177 const struct nlattr * const nla[])
7179 struct netlink_ext_ack *extack = info->extack;
7180 u8 genmask = nft_genmask_next(info->net);
7181 u8 family = info->nfmsg->nfgen_family;
7182 struct net *net = info->net;
7183 const struct nlattr *attr;
7184 struct nft_table *table;
7185 struct nft_object *obj;
7189 if (!nla[NFTA_OBJ_TYPE] ||
7190 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7193 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7194 NETLINK_CB(skb).portid);
7195 if (IS_ERR(table)) {
7196 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7197 return PTR_ERR(table);
7200 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7201 if (nla[NFTA_OBJ_HANDLE]) {
7202 attr = nla[NFTA_OBJ_HANDLE];
7203 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7205 attr = nla[NFTA_OBJ_NAME];
7206 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7210 NL_SET_BAD_ATTR(extack, attr);
7211 return PTR_ERR(obj);
7214 NL_SET_BAD_ATTR(extack, attr);
7218 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7220 return nft_delobj(&ctx, obj);
7223 void nft_obj_notify(struct net *net, const struct nft_table *table,
7224 struct nft_object *obj, u32 portid, u32 seq, int event,
7225 u16 flags, int family, int report, gfp_t gfp)
7227 struct nftables_pernet *nft_net = nft_pernet(net);
7228 struct sk_buff *skb;
7230 char *buf = kasprintf(gfp, "%s:%u",
7231 table->name, nft_net->base_seq);
7233 audit_log_nfcfg(buf,
7236 event == NFT_MSG_NEWOBJ ?
7237 AUDIT_NFT_OP_OBJ_REGISTER :
7238 AUDIT_NFT_OP_OBJ_UNREGISTER,
7243 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7246 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7250 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7251 flags & (NLM_F_CREATE | NLM_F_EXCL),
7252 family, table, obj, false);
7258 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7261 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7263 EXPORT_SYMBOL_GPL(nft_obj_notify);
7265 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7266 struct nft_object *obj, int event)
7268 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7269 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7275 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7277 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7278 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7279 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7281 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7283 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7285 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7286 list_del_rcu(&type->list);
7287 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7289 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7291 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7292 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7293 .len = NFT_NAME_MAXLEN - 1 },
7294 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7295 .len = NFT_NAME_MAXLEN - 1 },
7296 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7297 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7298 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7301 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7302 const struct nlattr *nla, u8 genmask)
7304 struct nft_flowtable *flowtable;
7306 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7307 if (!nla_strcmp(nla, flowtable->name) &&
7308 nft_active_genmask(flowtable, genmask))
7311 return ERR_PTR(-ENOENT);
7313 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7315 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7316 struct nft_flowtable *flowtable,
7317 enum nft_trans_phase phase)
7320 case NFT_TRANS_PREPARE:
7321 case NFT_TRANS_ABORT:
7322 case NFT_TRANS_RELEASE:
7329 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7331 static struct nft_flowtable *
7332 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7333 const struct nlattr *nla, u8 genmask)
7335 struct nft_flowtable *flowtable;
7337 list_for_each_entry(flowtable, &table->flowtables, list) {
7338 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7339 nft_active_genmask(flowtable, genmask))
7342 return ERR_PTR(-ENOENT);
7345 struct nft_flowtable_hook {
7348 struct list_head list;
7351 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7352 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7353 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7354 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7357 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7358 const struct nlattr *attr,
7359 struct nft_flowtable_hook *flowtable_hook,
7360 struct nft_flowtable *flowtable, bool add)
7362 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7363 struct nft_hook *hook;
7364 int hooknum, priority;
7367 INIT_LIST_HEAD(&flowtable_hook->list);
7369 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7370 nft_flowtable_hook_policy, NULL);
7375 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7376 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7379 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7380 if (hooknum != NF_NETDEV_INGRESS)
7383 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7385 flowtable_hook->priority = priority;
7386 flowtable_hook->num = hooknum;
7388 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7389 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7390 if (hooknum != flowtable->hooknum)
7394 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7395 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7396 if (priority != flowtable->data.priority)
7400 flowtable_hook->priority = flowtable->data.priority;
7401 flowtable_hook->num = flowtable->hooknum;
7404 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7405 err = nf_tables_parse_netdev_hooks(ctx->net,
7406 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7407 &flowtable_hook->list);
7412 list_for_each_entry(hook, &flowtable_hook->list, list) {
7413 hook->ops.pf = NFPROTO_NETDEV;
7414 hook->ops.hooknum = flowtable_hook->num;
7415 hook->ops.priority = flowtable_hook->priority;
7416 hook->ops.priv = &flowtable->data;
7417 hook->ops.hook = flowtable->data.type->hook;
7423 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7425 const struct nf_flowtable_type *type;
7427 list_for_each_entry(type, &nf_tables_flowtables, list) {
7428 if (family == type->family)
7434 static const struct nf_flowtable_type *
7435 nft_flowtable_type_get(struct net *net, u8 family)
7437 const struct nf_flowtable_type *type;
7439 type = __nft_flowtable_type_get(family);
7440 if (type != NULL && try_module_get(type->owner))
7443 lockdep_nfnl_nft_mutex_not_held();
7444 #ifdef CONFIG_MODULES
7446 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7447 return ERR_PTR(-EAGAIN);
7450 return ERR_PTR(-ENOENT);
7453 /* Only called from error and netdev event paths. */
7454 static void nft_unregister_flowtable_hook(struct net *net,
7455 struct nft_flowtable *flowtable,
7456 struct nft_hook *hook)
7458 nf_unregister_net_hook(net, &hook->ops);
7459 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7463 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7464 struct list_head *hook_list,
7465 bool release_netdev)
7467 struct nft_hook *hook, *next;
7469 list_for_each_entry_safe(hook, next, hook_list, list) {
7470 nf_unregister_net_hook(net, &hook->ops);
7471 if (release_netdev) {
7472 list_del(&hook->list);
7473 kfree_rcu(hook, rcu);
7478 static void nft_unregister_flowtable_net_hooks(struct net *net,
7479 struct list_head *hook_list)
7481 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7484 static int nft_register_flowtable_net_hooks(struct net *net,
7485 struct nft_table *table,
7486 struct list_head *hook_list,
7487 struct nft_flowtable *flowtable)
7489 struct nft_hook *hook, *hook2, *next;
7490 struct nft_flowtable *ft;
7493 list_for_each_entry(hook, hook_list, list) {
7494 list_for_each_entry(ft, &table->flowtables, list) {
7495 if (!nft_is_active_next(net, ft))
7498 list_for_each_entry(hook2, &ft->hook_list, list) {
7499 if (hook->ops.dev == hook2->ops.dev &&
7500 hook->ops.pf == hook2->ops.pf) {
7502 goto err_unregister_net_hooks;
7507 err = flowtable->data.type->setup(&flowtable->data,
7511 goto err_unregister_net_hooks;
7513 err = nf_register_net_hook(net, &hook->ops);
7515 flowtable->data.type->setup(&flowtable->data,
7518 goto err_unregister_net_hooks;
7526 err_unregister_net_hooks:
7527 list_for_each_entry_safe(hook, next, hook_list, list) {
7531 nft_unregister_flowtable_hook(net, flowtable, hook);
7532 list_del_rcu(&hook->list);
7533 kfree_rcu(hook, rcu);
7539 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7541 struct nft_hook *hook, *next;
7543 list_for_each_entry_safe(hook, next, hook_list, list) {
7544 list_del_rcu(&hook->list);
7545 kfree_rcu(hook, rcu);
7549 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7550 struct nft_flowtable *flowtable)
7552 const struct nlattr * const *nla = ctx->nla;
7553 struct nft_flowtable_hook flowtable_hook;
7554 struct nft_hook *hook, *next;
7555 struct nft_trans *trans;
7556 bool unregister = false;
7560 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7561 &flowtable_hook, flowtable, false);
7565 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7566 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7567 list_del(&hook->list);
7572 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7573 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7574 if (flags & ~NFT_FLOWTABLE_MASK) {
7576 goto err_flowtable_update_hook;
7578 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7579 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7581 goto err_flowtable_update_hook;
7584 flags = flowtable->data.flags;
7587 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7588 &flowtable_hook.list, flowtable);
7590 goto err_flowtable_update_hook;
7592 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7593 sizeof(struct nft_trans_flowtable));
7597 goto err_flowtable_update_hook;
7600 nft_trans_flowtable_flags(trans) = flags;
7601 nft_trans_flowtable(trans) = flowtable;
7602 nft_trans_flowtable_update(trans) = true;
7603 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7604 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7606 nft_trans_commit_list_add_tail(ctx->net, trans);
7610 err_flowtable_update_hook:
7611 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7613 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7614 list_del_rcu(&hook->list);
7615 kfree_rcu(hook, rcu);
7622 static int nf_tables_newflowtable(struct sk_buff *skb,
7623 const struct nfnl_info *info,
7624 const struct nlattr * const nla[])
7626 struct netlink_ext_ack *extack = info->extack;
7627 struct nft_flowtable_hook flowtable_hook;
7628 u8 genmask = nft_genmask_next(info->net);
7629 u8 family = info->nfmsg->nfgen_family;
7630 const struct nf_flowtable_type *type;
7631 struct nft_flowtable *flowtable;
7632 struct nft_hook *hook, *next;
7633 struct net *net = info->net;
7634 struct nft_table *table;
7638 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7639 !nla[NFTA_FLOWTABLE_NAME] ||
7640 !nla[NFTA_FLOWTABLE_HOOK])
7643 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7644 genmask, NETLINK_CB(skb).portid);
7645 if (IS_ERR(table)) {
7646 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7647 return PTR_ERR(table);
7650 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7652 if (IS_ERR(flowtable)) {
7653 err = PTR_ERR(flowtable);
7654 if (err != -ENOENT) {
7655 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7659 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7660 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7664 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7666 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7669 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7671 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7675 flowtable->table = table;
7676 flowtable->handle = nf_tables_alloc_handle(table);
7677 INIT_LIST_HEAD(&flowtable->hook_list);
7679 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7680 if (!flowtable->name) {
7685 type = nft_flowtable_type_get(net, family);
7687 err = PTR_ERR(type);
7691 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7692 flowtable->data.flags =
7693 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7694 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7700 write_pnet(&flowtable->data.net, net);
7701 flowtable->data.type = type;
7702 err = type->init(&flowtable->data);
7706 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7707 &flowtable_hook, flowtable, true);
7711 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7712 flowtable->data.priority = flowtable_hook.priority;
7713 flowtable->hooknum = flowtable_hook.num;
7715 err = nft_register_flowtable_net_hooks(ctx.net, table,
7716 &flowtable->hook_list,
7719 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7723 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7727 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7732 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7733 nft_unregister_flowtable_hook(net, flowtable, hook);
7734 list_del_rcu(&hook->list);
7735 kfree_rcu(hook, rcu);
7738 flowtable->data.type->free(&flowtable->data);
7740 module_put(type->owner);
7742 kfree(flowtable->name);
7748 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7750 struct nft_hook *this, *next;
7752 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7753 list_del(&this->list);
7758 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7759 struct nft_flowtable *flowtable)
7761 const struct nlattr * const *nla = ctx->nla;
7762 struct nft_flowtable_hook flowtable_hook;
7763 LIST_HEAD(flowtable_del_list);
7764 struct nft_hook *this, *hook;
7765 struct nft_trans *trans;
7768 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7769 &flowtable_hook, flowtable, false);
7773 list_for_each_entry(this, &flowtable_hook.list, list) {
7774 hook = nft_hook_list_find(&flowtable->hook_list, this);
7777 goto err_flowtable_del_hook;
7779 list_move(&hook->list, &flowtable_del_list);
7782 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7783 sizeof(struct nft_trans_flowtable));
7786 goto err_flowtable_del_hook;
7789 nft_trans_flowtable(trans) = flowtable;
7790 nft_trans_flowtable_update(trans) = true;
7791 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7792 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7793 nft_flowtable_hook_release(&flowtable_hook);
7795 nft_trans_commit_list_add_tail(ctx->net, trans);
7799 err_flowtable_del_hook:
7800 list_splice(&flowtable_del_list, &flowtable->hook_list);
7801 nft_flowtable_hook_release(&flowtable_hook);
7806 static int nf_tables_delflowtable(struct sk_buff *skb,
7807 const struct nfnl_info *info,
7808 const struct nlattr * const nla[])
7810 struct netlink_ext_ack *extack = info->extack;
7811 u8 genmask = nft_genmask_next(info->net);
7812 u8 family = info->nfmsg->nfgen_family;
7813 struct nft_flowtable *flowtable;
7814 struct net *net = info->net;
7815 const struct nlattr *attr;
7816 struct nft_table *table;
7819 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7820 (!nla[NFTA_FLOWTABLE_NAME] &&
7821 !nla[NFTA_FLOWTABLE_HANDLE]))
7824 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7825 genmask, NETLINK_CB(skb).portid);
7826 if (IS_ERR(table)) {
7827 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7828 return PTR_ERR(table);
7831 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7832 attr = nla[NFTA_FLOWTABLE_HANDLE];
7833 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7835 attr = nla[NFTA_FLOWTABLE_NAME];
7836 flowtable = nft_flowtable_lookup(table, attr, genmask);
7839 if (IS_ERR(flowtable)) {
7840 NL_SET_BAD_ATTR(extack, attr);
7841 return PTR_ERR(flowtable);
7844 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7846 if (nla[NFTA_FLOWTABLE_HOOK])
7847 return nft_delflowtable_hook(&ctx, flowtable);
7849 if (flowtable->use > 0) {
7850 NL_SET_BAD_ATTR(extack, attr);
7854 return nft_delflowtable(&ctx, flowtable);
7857 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7858 u32 portid, u32 seq, int event,
7859 u32 flags, int family,
7860 struct nft_flowtable *flowtable,
7861 struct list_head *hook_list)
7863 struct nlattr *nest, *nest_devs;
7864 struct nft_hook *hook;
7865 struct nlmsghdr *nlh;
7867 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7868 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7869 NFNETLINK_V0, nft_base_seq(net));
7871 goto nla_put_failure;
7873 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7874 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7875 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7876 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7877 NFTA_FLOWTABLE_PAD) ||
7878 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7879 goto nla_put_failure;
7881 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7883 goto nla_put_failure;
7884 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7885 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7886 goto nla_put_failure;
7888 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7890 goto nla_put_failure;
7892 list_for_each_entry_rcu(hook, hook_list, list) {
7893 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7894 goto nla_put_failure;
7896 nla_nest_end(skb, nest_devs);
7897 nla_nest_end(skb, nest);
7899 nlmsg_end(skb, nlh);
7903 nlmsg_trim(skb, nlh);
7907 struct nft_flowtable_filter {
7911 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7912 struct netlink_callback *cb)
7914 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7915 struct nft_flowtable_filter *filter = cb->data;
7916 unsigned int idx = 0, s_idx = cb->args[0];
7917 struct net *net = sock_net(skb->sk);
7918 int family = nfmsg->nfgen_family;
7919 struct nft_flowtable *flowtable;
7920 struct nftables_pernet *nft_net;
7921 const struct nft_table *table;
7924 nft_net = nft_pernet(net);
7925 cb->seq = READ_ONCE(nft_net->base_seq);
7927 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7928 if (family != NFPROTO_UNSPEC && family != table->family)
7931 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7932 if (!nft_is_active(net, flowtable))
7937 memset(&cb->args[1], 0,
7938 sizeof(cb->args) - sizeof(cb->args[0]));
7939 if (filter && filter->table &&
7940 strcmp(filter->table, table->name))
7943 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7945 NFT_MSG_NEWFLOWTABLE,
7946 NLM_F_MULTI | NLM_F_APPEND,
7949 &flowtable->hook_list) < 0)
7952 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7964 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7966 const struct nlattr * const *nla = cb->data;
7967 struct nft_flowtable_filter *filter = NULL;
7969 if (nla[NFTA_FLOWTABLE_TABLE]) {
7970 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7974 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7976 if (!filter->table) {
7986 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7988 struct nft_flowtable_filter *filter = cb->data;
7993 kfree(filter->table);
7999 /* called with rcu_read_lock held */
8000 static int nf_tables_getflowtable(struct sk_buff *skb,
8001 const struct nfnl_info *info,
8002 const struct nlattr * const nla[])
8004 u8 genmask = nft_genmask_cur(info->net);
8005 u8 family = info->nfmsg->nfgen_family;
8006 struct nft_flowtable *flowtable;
8007 const struct nft_table *table;
8008 struct net *net = info->net;
8009 struct sk_buff *skb2;
8012 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
8013 struct netlink_dump_control c = {
8014 .start = nf_tables_dump_flowtable_start,
8015 .dump = nf_tables_dump_flowtable,
8016 .done = nf_tables_dump_flowtable_done,
8017 .module = THIS_MODULE,
8018 .data = (void *)nla,
8021 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
8024 if (!nla[NFTA_FLOWTABLE_NAME])
8027 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
8030 return PTR_ERR(table);
8032 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
8034 if (IS_ERR(flowtable))
8035 return PTR_ERR(flowtable);
8037 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8041 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
8042 info->nlh->nlmsg_seq,
8043 NFT_MSG_NEWFLOWTABLE, 0, family,
8044 flowtable, &flowtable->hook_list);
8046 goto err_fill_flowtable_info;
8048 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
8050 err_fill_flowtable_info:
8055 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
8056 struct nft_flowtable *flowtable,
8057 struct list_head *hook_list,
8060 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
8061 struct sk_buff *skb;
8066 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
8069 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8073 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
8074 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
8076 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
8077 ctx->seq, event, flags,
8078 ctx->family, flowtable, hook_list);
8084 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
8087 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
8090 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
8092 struct nft_hook *hook, *next;
8094 flowtable->data.type->free(&flowtable->data);
8095 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
8096 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
8098 list_del_rcu(&hook->list);
8101 kfree(flowtable->name);
8102 module_put(flowtable->data.type->owner);
8106 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
8107 u32 portid, u32 seq)
8109 struct nftables_pernet *nft_net = nft_pernet(net);
8110 struct nlmsghdr *nlh;
8111 char buf[TASK_COMM_LEN];
8112 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
8114 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
8115 NFNETLINK_V0, nft_base_seq(net));
8117 goto nla_put_failure;
8119 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
8120 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
8121 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
8122 goto nla_put_failure;
8124 nlmsg_end(skb, nlh);
8128 nlmsg_trim(skb, nlh);
8132 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8133 struct nft_flowtable *flowtable)
8135 struct nft_hook *hook;
8137 list_for_each_entry(hook, &flowtable->hook_list, list) {
8138 if (hook->ops.dev != dev)
8141 /* flow_offload_netdev_event() cleans up entries for us. */
8142 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8143 list_del_rcu(&hook->list);
8144 kfree_rcu(hook, rcu);
8149 static int nf_tables_flowtable_event(struct notifier_block *this,
8150 unsigned long event, void *ptr)
8152 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8153 struct nft_flowtable *flowtable;
8154 struct nftables_pernet *nft_net;
8155 struct nft_table *table;
8158 if (event != NETDEV_UNREGISTER)
8162 nft_net = nft_pernet(net);
8163 mutex_lock(&nft_net->commit_mutex);
8164 list_for_each_entry(table, &nft_net->tables, list) {
8165 list_for_each_entry(flowtable, &table->flowtables, list) {
8166 nft_flowtable_event(event, dev, flowtable);
8169 mutex_unlock(&nft_net->commit_mutex);
8174 static struct notifier_block nf_tables_flowtable_notifier = {
8175 .notifier_call = nf_tables_flowtable_event,
8178 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8181 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8182 struct sk_buff *skb2;
8185 if (!nlmsg_report(nlh) &&
8186 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8189 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8193 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8200 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8201 nlmsg_report(nlh), GFP_KERNEL);
8204 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8208 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8209 const struct nlattr * const nla[])
8211 struct sk_buff *skb2;
8214 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8218 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8219 info->nlh->nlmsg_seq);
8221 goto err_fill_gen_info;
8223 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8230 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8231 [NFT_MSG_NEWTABLE] = {
8232 .call = nf_tables_newtable,
8233 .type = NFNL_CB_BATCH,
8234 .attr_count = NFTA_TABLE_MAX,
8235 .policy = nft_table_policy,
8237 [NFT_MSG_GETTABLE] = {
8238 .call = nf_tables_gettable,
8239 .type = NFNL_CB_RCU,
8240 .attr_count = NFTA_TABLE_MAX,
8241 .policy = nft_table_policy,
8243 [NFT_MSG_DELTABLE] = {
8244 .call = nf_tables_deltable,
8245 .type = NFNL_CB_BATCH,
8246 .attr_count = NFTA_TABLE_MAX,
8247 .policy = nft_table_policy,
8249 [NFT_MSG_NEWCHAIN] = {
8250 .call = nf_tables_newchain,
8251 .type = NFNL_CB_BATCH,
8252 .attr_count = NFTA_CHAIN_MAX,
8253 .policy = nft_chain_policy,
8255 [NFT_MSG_GETCHAIN] = {
8256 .call = nf_tables_getchain,
8257 .type = NFNL_CB_RCU,
8258 .attr_count = NFTA_CHAIN_MAX,
8259 .policy = nft_chain_policy,
8261 [NFT_MSG_DELCHAIN] = {
8262 .call = nf_tables_delchain,
8263 .type = NFNL_CB_BATCH,
8264 .attr_count = NFTA_CHAIN_MAX,
8265 .policy = nft_chain_policy,
8267 [NFT_MSG_NEWRULE] = {
8268 .call = nf_tables_newrule,
8269 .type = NFNL_CB_BATCH,
8270 .attr_count = NFTA_RULE_MAX,
8271 .policy = nft_rule_policy,
8273 [NFT_MSG_GETRULE] = {
8274 .call = nf_tables_getrule,
8275 .type = NFNL_CB_RCU,
8276 .attr_count = NFTA_RULE_MAX,
8277 .policy = nft_rule_policy,
8279 [NFT_MSG_DELRULE] = {
8280 .call = nf_tables_delrule,
8281 .type = NFNL_CB_BATCH,
8282 .attr_count = NFTA_RULE_MAX,
8283 .policy = nft_rule_policy,
8285 [NFT_MSG_NEWSET] = {
8286 .call = nf_tables_newset,
8287 .type = NFNL_CB_BATCH,
8288 .attr_count = NFTA_SET_MAX,
8289 .policy = nft_set_policy,
8291 [NFT_MSG_GETSET] = {
8292 .call = nf_tables_getset,
8293 .type = NFNL_CB_RCU,
8294 .attr_count = NFTA_SET_MAX,
8295 .policy = nft_set_policy,
8297 [NFT_MSG_DELSET] = {
8298 .call = nf_tables_delset,
8299 .type = NFNL_CB_BATCH,
8300 .attr_count = NFTA_SET_MAX,
8301 .policy = nft_set_policy,
8303 [NFT_MSG_NEWSETELEM] = {
8304 .call = nf_tables_newsetelem,
8305 .type = NFNL_CB_BATCH,
8306 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8307 .policy = nft_set_elem_list_policy,
8309 [NFT_MSG_GETSETELEM] = {
8310 .call = nf_tables_getsetelem,
8311 .type = NFNL_CB_RCU,
8312 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8313 .policy = nft_set_elem_list_policy,
8315 [NFT_MSG_DELSETELEM] = {
8316 .call = nf_tables_delsetelem,
8317 .type = NFNL_CB_BATCH,
8318 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8319 .policy = nft_set_elem_list_policy,
8321 [NFT_MSG_GETGEN] = {
8322 .call = nf_tables_getgen,
8323 .type = NFNL_CB_RCU,
8325 [NFT_MSG_NEWOBJ] = {
8326 .call = nf_tables_newobj,
8327 .type = NFNL_CB_BATCH,
8328 .attr_count = NFTA_OBJ_MAX,
8329 .policy = nft_obj_policy,
8331 [NFT_MSG_GETOBJ] = {
8332 .call = nf_tables_getobj,
8333 .type = NFNL_CB_RCU,
8334 .attr_count = NFTA_OBJ_MAX,
8335 .policy = nft_obj_policy,
8337 [NFT_MSG_DELOBJ] = {
8338 .call = nf_tables_delobj,
8339 .type = NFNL_CB_BATCH,
8340 .attr_count = NFTA_OBJ_MAX,
8341 .policy = nft_obj_policy,
8343 [NFT_MSG_GETOBJ_RESET] = {
8344 .call = nf_tables_getobj,
8345 .type = NFNL_CB_RCU,
8346 .attr_count = NFTA_OBJ_MAX,
8347 .policy = nft_obj_policy,
8349 [NFT_MSG_NEWFLOWTABLE] = {
8350 .call = nf_tables_newflowtable,
8351 .type = NFNL_CB_BATCH,
8352 .attr_count = NFTA_FLOWTABLE_MAX,
8353 .policy = nft_flowtable_policy,
8355 [NFT_MSG_GETFLOWTABLE] = {
8356 .call = nf_tables_getflowtable,
8357 .type = NFNL_CB_RCU,
8358 .attr_count = NFTA_FLOWTABLE_MAX,
8359 .policy = nft_flowtable_policy,
8361 [NFT_MSG_DELFLOWTABLE] = {
8362 .call = nf_tables_delflowtable,
8363 .type = NFNL_CB_BATCH,
8364 .attr_count = NFTA_FLOWTABLE_MAX,
8365 .policy = nft_flowtable_policy,
8369 static int nf_tables_validate(struct net *net)
8371 struct nftables_pernet *nft_net = nft_pernet(net);
8372 struct nft_table *table;
8374 switch (nft_net->validate_state) {
8375 case NFT_VALIDATE_SKIP:
8377 case NFT_VALIDATE_NEED:
8378 nft_validate_state_update(net, NFT_VALIDATE_DO);
8380 case NFT_VALIDATE_DO:
8381 list_for_each_entry(table, &nft_net->tables, list) {
8382 if (nft_table_validate(net, table) < 0)
8391 /* a drop policy has to be deferred until all rules have been activated,
8392 * otherwise a large ruleset that contains a drop-policy base chain will
8393 * cause all packets to get dropped until the full transaction has been
8396 * We defer the drop policy until the transaction has been finalized.
8398 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8400 struct nft_base_chain *basechain;
8402 if (nft_trans_chain_policy(trans) != NF_DROP)
8405 if (!nft_is_base_chain(trans->ctx.chain))
8408 basechain = nft_base_chain(trans->ctx.chain);
8409 basechain->policy = NF_DROP;
8412 static void nft_chain_commit_update(struct nft_trans *trans)
8414 struct nft_base_chain *basechain;
8416 if (nft_trans_chain_name(trans)) {
8417 rhltable_remove(&trans->ctx.table->chains_ht,
8418 &trans->ctx.chain->rhlhead,
8419 nft_chain_ht_params);
8420 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8421 rhltable_insert_key(&trans->ctx.table->chains_ht,
8422 trans->ctx.chain->name,
8423 &trans->ctx.chain->rhlhead,
8424 nft_chain_ht_params);
8427 if (!nft_is_base_chain(trans->ctx.chain))
8430 nft_chain_stats_replace(trans);
8432 basechain = nft_base_chain(trans->ctx.chain);
8434 switch (nft_trans_chain_policy(trans)) {
8437 basechain->policy = nft_trans_chain_policy(trans);
8442 static void nft_obj_commit_update(struct nft_trans *trans)
8444 struct nft_object *newobj;
8445 struct nft_object *obj;
8447 obj = nft_trans_obj(trans);
8448 newobj = nft_trans_obj_newobj(trans);
8450 if (obj->ops->update)
8451 obj->ops->update(obj, newobj);
8453 nft_obj_destroy(&trans->ctx, newobj);
8456 static void nft_commit_release(struct nft_trans *trans)
8458 switch (trans->msg_type) {
8459 case NFT_MSG_DELTABLE:
8460 nf_tables_table_destroy(&trans->ctx);
8462 case NFT_MSG_NEWCHAIN:
8463 free_percpu(nft_trans_chain_stats(trans));
8464 kfree(nft_trans_chain_name(trans));
8466 case NFT_MSG_DELCHAIN:
8467 nf_tables_chain_destroy(&trans->ctx);
8469 case NFT_MSG_DELRULE:
8470 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8472 case NFT_MSG_DELSET:
8473 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8475 case NFT_MSG_DELSETELEM:
8476 nf_tables_set_elem_destroy(&trans->ctx,
8477 nft_trans_elem_set(trans),
8478 nft_trans_elem(trans).priv);
8480 case NFT_MSG_DELOBJ:
8481 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8483 case NFT_MSG_DELFLOWTABLE:
8484 if (nft_trans_flowtable_update(trans))
8485 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8487 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8492 put_net(trans->ctx.net);
8497 static void nf_tables_trans_destroy_work(struct work_struct *w)
8499 struct nft_trans *trans, *next;
8502 spin_lock(&nf_tables_destroy_list_lock);
8503 list_splice_init(&nf_tables_destroy_list, &head);
8504 spin_unlock(&nf_tables_destroy_list_lock);
8506 if (list_empty(&head))
8511 list_for_each_entry_safe(trans, next, &head, list) {
8512 list_del(&trans->list);
8513 nft_commit_release(trans);
8517 void nf_tables_trans_destroy_flush_work(void)
8519 flush_work(&trans_destroy_work);
8521 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8523 static bool nft_expr_reduce(struct nft_regs_track *track,
8524 const struct nft_expr *expr)
8529 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8531 const struct nft_expr *expr, *last;
8532 struct nft_regs_track track = {};
8533 unsigned int size, data_size;
8534 void *data, *data_boundary;
8535 struct nft_rule_dp *prule;
8536 struct nft_rule *rule;
8538 /* already handled or inactive chain? */
8539 if (chain->blob_next || !nft_is_active_next(net, chain))
8543 list_for_each_entry(rule, &chain->rules, list) {
8544 if (nft_is_active_next(net, rule)) {
8545 data_size += sizeof(*prule) + rule->dlen;
8546 if (data_size > INT_MAX)
8550 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
8552 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8553 if (!chain->blob_next)
8556 data = (void *)chain->blob_next->data;
8557 data_boundary = data + data_size;
8560 list_for_each_entry(rule, &chain->rules, list) {
8561 if (!nft_is_active_next(net, rule))
8564 prule = (struct nft_rule_dp *)data;
8565 data += offsetof(struct nft_rule_dp, data);
8566 if (WARN_ON_ONCE(data > data_boundary))
8570 track.last = nft_expr_last(rule);
8571 nft_rule_for_each_expr(expr, last, rule) {
8574 if (nft_expr_reduce(&track, expr)) {
8579 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8582 memcpy(data + size, expr, expr->ops->size);
8583 size += expr->ops->size;
8585 if (WARN_ON_ONCE(size >= 1 << 12))
8588 prule->handle = rule->handle;
8594 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8597 prule = (struct nft_rule_dp *)data;
8598 data += offsetof(struct nft_rule_dp, data);
8599 if (WARN_ON_ONCE(data > data_boundary))
8602 nft_last_rule(chain->blob_next, prule);
8607 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8609 struct nftables_pernet *nft_net = nft_pernet(net);
8610 struct nft_trans *trans, *next;
8612 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8613 struct nft_chain *chain = trans->ctx.chain;
8615 if (trans->msg_type == NFT_MSG_NEWRULE ||
8616 trans->msg_type == NFT_MSG_DELRULE) {
8617 kvfree(chain->blob_next);
8618 chain->blob_next = NULL;
8623 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8625 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8630 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8632 struct nft_rules_old *old;
8634 /* rcu_head is after end marker */
8635 old = (void *)blob + sizeof(*blob) + blob->size;
8638 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8641 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8643 struct nft_rule_blob *g0, *g1;
8646 next_genbit = nft_gencursor_next(net);
8648 g0 = rcu_dereference_protected(chain->blob_gen_0,
8649 lockdep_commit_lock_is_held(net));
8650 g1 = rcu_dereference_protected(chain->blob_gen_1,
8651 lockdep_commit_lock_is_held(net));
8653 /* No changes to this chain? */
8654 if (chain->blob_next == NULL) {
8655 /* chain had no change in last or next generation */
8659 * chain had no change in this generation; make sure next
8660 * one uses same rules as current generation.
8663 rcu_assign_pointer(chain->blob_gen_1, g0);
8664 nf_tables_commit_chain_free_rules_old(g1);
8666 rcu_assign_pointer(chain->blob_gen_0, g1);
8667 nf_tables_commit_chain_free_rules_old(g0);
8674 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8676 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8678 chain->blob_next = NULL;
8684 nf_tables_commit_chain_free_rules_old(g1);
8686 nf_tables_commit_chain_free_rules_old(g0);
8689 static void nft_obj_del(struct nft_object *obj)
8691 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8692 list_del_rcu(&obj->list);
8695 void nft_chain_del(struct nft_chain *chain)
8697 struct nft_table *table = chain->table;
8699 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8700 nft_chain_ht_params));
8701 list_del_rcu(&chain->list);
8704 static void nf_tables_module_autoload_cleanup(struct net *net)
8706 struct nftables_pernet *nft_net = nft_pernet(net);
8707 struct nft_module_request *req, *next;
8709 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8710 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8711 WARN_ON_ONCE(!req->done);
8712 list_del(&req->list);
8717 static void nf_tables_commit_release(struct net *net)
8719 struct nftables_pernet *nft_net = nft_pernet(net);
8720 struct nft_trans *trans;
8722 /* all side effects have to be made visible.
8723 * For example, if a chain named 'foo' has been deleted, a
8724 * new transaction must not find it anymore.
8726 * Memory reclaim happens asynchronously from work queue
8727 * to prevent expensive synchronize_rcu() in commit phase.
8729 if (list_empty(&nft_net->commit_list)) {
8730 nf_tables_module_autoload_cleanup(net);
8731 mutex_unlock(&nft_net->commit_mutex);
8735 trans = list_last_entry(&nft_net->commit_list,
8736 struct nft_trans, list);
8737 get_net(trans->ctx.net);
8738 WARN_ON_ONCE(trans->put_net);
8740 trans->put_net = true;
8741 spin_lock(&nf_tables_destroy_list_lock);
8742 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8743 spin_unlock(&nf_tables_destroy_list_lock);
8745 nf_tables_module_autoload_cleanup(net);
8746 schedule_work(&trans_destroy_work);
8748 mutex_unlock(&nft_net->commit_mutex);
8751 static void nft_commit_notify(struct net *net, u32 portid)
8753 struct nftables_pernet *nft_net = nft_pernet(net);
8754 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8755 unsigned char *data;
8758 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8762 len = NLMSG_GOODSIZE - skb->len;
8763 list_del(&skb->list);
8767 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8768 data = skb_put(batch_skb, skb->len);
8769 memcpy(data, skb->data, skb->len);
8770 list_del(&skb->list);
8774 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8775 NFT_CB(batch_skb).report, GFP_KERNEL);
8780 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8781 NFT_CB(batch_skb).report, GFP_KERNEL);
8784 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8787 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8788 struct nft_table *table)
8790 struct nft_audit_data *adp;
8792 list_for_each_entry(adp, adl, list) {
8793 if (adp->table == table)
8796 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8800 list_add(&adp->list, adl);
8804 static void nf_tables_commit_audit_free(struct list_head *adl)
8806 struct nft_audit_data *adp, *adn;
8808 list_for_each_entry_safe(adp, adn, adl, list) {
8809 list_del(&adp->list);
8814 static void nf_tables_commit_audit_collect(struct list_head *adl,
8815 struct nft_table *table, u32 op)
8817 struct nft_audit_data *adp;
8819 list_for_each_entry(adp, adl, list) {
8820 if (adp->table == table)
8823 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8827 if (!adp->op || adp->op > op)
8831 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8833 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8835 struct nft_audit_data *adp, *adn;
8836 char aubuf[AUNFTABLENAMELEN];
8838 list_for_each_entry_safe(adp, adn, adl, list) {
8839 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8841 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8842 nft2audit_op[adp->op], GFP_KERNEL);
8843 list_del(&adp->list);
8848 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8850 struct nftables_pernet *nft_net = nft_pernet(net);
8851 struct nft_trans *trans, *next;
8852 struct nft_trans_elem *te;
8853 struct nft_chain *chain;
8854 struct nft_table *table;
8855 unsigned int base_seq;
8859 if (list_empty(&nft_net->commit_list)) {
8860 mutex_unlock(&nft_net->commit_mutex);
8864 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8865 if (nf_tables_validate(net) < 0)
8868 err = nft_flow_rule_offload_commit(net);
8872 /* 1. Allocate space for next generation rules_gen_X[] */
8873 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8876 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8878 nf_tables_commit_chain_prepare_cancel(net);
8879 nf_tables_commit_audit_free(&adl);
8882 if (trans->msg_type == NFT_MSG_NEWRULE ||
8883 trans->msg_type == NFT_MSG_DELRULE) {
8884 chain = trans->ctx.chain;
8886 ret = nf_tables_commit_chain_prepare(net, chain);
8888 nf_tables_commit_chain_prepare_cancel(net);
8889 nf_tables_commit_audit_free(&adl);
8895 /* step 2. Make rules_gen_X visible to packet path */
8896 list_for_each_entry(table, &nft_net->tables, list) {
8897 list_for_each_entry(chain, &table->chains, list)
8898 nf_tables_commit_chain(net, chain);
8902 * Bump generation counter, invalidate any dump in progress.
8903 * Cannot fail after this point.
8905 base_seq = READ_ONCE(nft_net->base_seq);
8906 while (++base_seq == 0)
8909 WRITE_ONCE(nft_net->base_seq, base_seq);
8911 /* step 3. Start new generation, rules_gen_X now in use. */
8912 net->nft.gencursor = nft_gencursor_next(net);
8914 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8915 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8917 switch (trans->msg_type) {
8918 case NFT_MSG_NEWTABLE:
8919 if (nft_trans_table_update(trans)) {
8920 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8921 nft_trans_destroy(trans);
8924 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8925 nf_tables_table_disable(net, trans->ctx.table);
8927 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8929 nft_clear(net, trans->ctx.table);
8931 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8932 nft_trans_destroy(trans);
8934 case NFT_MSG_DELTABLE:
8935 list_del_rcu(&trans->ctx.table->list);
8936 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8938 case NFT_MSG_NEWCHAIN:
8939 if (nft_trans_chain_update(trans)) {
8940 nft_chain_commit_update(trans);
8941 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8942 /* trans destroyed after rcu grace period */
8944 nft_chain_commit_drop_policy(trans);
8945 nft_clear(net, trans->ctx.chain);
8946 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8947 nft_trans_destroy(trans);
8950 case NFT_MSG_DELCHAIN:
8951 nft_chain_del(trans->ctx.chain);
8952 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8953 nf_tables_unregister_hook(trans->ctx.net,
8957 case NFT_MSG_NEWRULE:
8958 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8959 nf_tables_rule_notify(&trans->ctx,
8960 nft_trans_rule(trans),
8962 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8963 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8965 nft_trans_destroy(trans);
8967 case NFT_MSG_DELRULE:
8968 list_del_rcu(&nft_trans_rule(trans)->list);
8969 nf_tables_rule_notify(&trans->ctx,
8970 nft_trans_rule(trans),
8972 nft_rule_expr_deactivate(&trans->ctx,
8973 nft_trans_rule(trans),
8976 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8977 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8979 case NFT_MSG_NEWSET:
8980 nft_clear(net, nft_trans_set(trans));
8981 /* This avoids hitting -EBUSY when deleting the table
8982 * from the transaction.
8984 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8985 !list_empty(&nft_trans_set(trans)->bindings))
8986 trans->ctx.table->use--;
8988 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8989 NFT_MSG_NEWSET, GFP_KERNEL);
8990 nft_trans_destroy(trans);
8992 case NFT_MSG_DELSET:
8993 list_del_rcu(&nft_trans_set(trans)->list);
8994 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8995 NFT_MSG_DELSET, GFP_KERNEL);
8997 case NFT_MSG_NEWSETELEM:
8998 te = (struct nft_trans_elem *)trans->data;
9000 nft_setelem_activate(net, te->set, &te->elem);
9001 nf_tables_setelem_notify(&trans->ctx, te->set,
9003 NFT_MSG_NEWSETELEM);
9004 nft_trans_destroy(trans);
9006 case NFT_MSG_DELSETELEM:
9007 te = (struct nft_trans_elem *)trans->data;
9009 nf_tables_setelem_notify(&trans->ctx, te->set,
9011 NFT_MSG_DELSETELEM);
9012 nft_setelem_remove(net, te->set, &te->elem);
9013 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
9014 atomic_dec(&te->set->nelems);
9018 case NFT_MSG_NEWOBJ:
9019 if (nft_trans_obj_update(trans)) {
9020 nft_obj_commit_update(trans);
9021 nf_tables_obj_notify(&trans->ctx,
9022 nft_trans_obj(trans),
9025 nft_clear(net, nft_trans_obj(trans));
9026 nf_tables_obj_notify(&trans->ctx,
9027 nft_trans_obj(trans),
9029 nft_trans_destroy(trans);
9032 case NFT_MSG_DELOBJ:
9033 nft_obj_del(nft_trans_obj(trans));
9034 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
9037 case NFT_MSG_NEWFLOWTABLE:
9038 if (nft_trans_flowtable_update(trans)) {
9039 nft_trans_flowtable(trans)->data.flags =
9040 nft_trans_flowtable_flags(trans);
9041 nf_tables_flowtable_notify(&trans->ctx,
9042 nft_trans_flowtable(trans),
9043 &nft_trans_flowtable_hooks(trans),
9044 NFT_MSG_NEWFLOWTABLE);
9045 list_splice(&nft_trans_flowtable_hooks(trans),
9046 &nft_trans_flowtable(trans)->hook_list);
9048 nft_clear(net, nft_trans_flowtable(trans));
9049 nf_tables_flowtable_notify(&trans->ctx,
9050 nft_trans_flowtable(trans),
9051 &nft_trans_flowtable(trans)->hook_list,
9052 NFT_MSG_NEWFLOWTABLE);
9054 nft_trans_destroy(trans);
9056 case NFT_MSG_DELFLOWTABLE:
9057 if (nft_trans_flowtable_update(trans)) {
9058 nf_tables_flowtable_notify(&trans->ctx,
9059 nft_trans_flowtable(trans),
9060 &nft_trans_flowtable_hooks(trans),
9061 NFT_MSG_DELFLOWTABLE);
9062 nft_unregister_flowtable_net_hooks(net,
9063 &nft_trans_flowtable_hooks(trans));
9065 list_del_rcu(&nft_trans_flowtable(trans)->list);
9066 nf_tables_flowtable_notify(&trans->ctx,
9067 nft_trans_flowtable(trans),
9068 &nft_trans_flowtable(trans)->hook_list,
9069 NFT_MSG_DELFLOWTABLE);
9070 nft_unregister_flowtable_net_hooks(net,
9071 &nft_trans_flowtable(trans)->hook_list);
9077 nft_commit_notify(net, NETLINK_CB(skb).portid);
9078 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
9079 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
9080 nf_tables_commit_release(net);
9085 static void nf_tables_module_autoload(struct net *net)
9087 struct nftables_pernet *nft_net = nft_pernet(net);
9088 struct nft_module_request *req, *next;
9089 LIST_HEAD(module_list);
9091 list_splice_init(&nft_net->module_list, &module_list);
9092 mutex_unlock(&nft_net->commit_mutex);
9093 list_for_each_entry_safe(req, next, &module_list, list) {
9094 request_module("%s", req->module);
9097 mutex_lock(&nft_net->commit_mutex);
9098 list_splice(&module_list, &nft_net->module_list);
9101 static void nf_tables_abort_release(struct nft_trans *trans)
9103 switch (trans->msg_type) {
9104 case NFT_MSG_NEWTABLE:
9105 nf_tables_table_destroy(&trans->ctx);
9107 case NFT_MSG_NEWCHAIN:
9108 nf_tables_chain_destroy(&trans->ctx);
9110 case NFT_MSG_NEWRULE:
9111 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
9113 case NFT_MSG_NEWSET:
9114 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
9116 case NFT_MSG_NEWSETELEM:
9117 nft_set_elem_destroy(nft_trans_elem_set(trans),
9118 nft_trans_elem(trans).priv, true);
9120 case NFT_MSG_NEWOBJ:
9121 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
9123 case NFT_MSG_NEWFLOWTABLE:
9124 if (nft_trans_flowtable_update(trans))
9125 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
9127 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
9133 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9135 struct nftables_pernet *nft_net = nft_pernet(net);
9136 struct nft_trans *trans, *next;
9137 struct nft_trans_elem *te;
9139 if (action == NFNL_ABORT_VALIDATE &&
9140 nf_tables_validate(net) < 0)
9143 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9145 switch (trans->msg_type) {
9146 case NFT_MSG_NEWTABLE:
9147 if (nft_trans_table_update(trans)) {
9148 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9149 nft_trans_destroy(trans);
9152 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9153 nf_tables_table_disable(net, trans->ctx.table);
9154 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9155 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9156 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9158 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9159 nft_trans_destroy(trans);
9161 list_del_rcu(&trans->ctx.table->list);
9164 case NFT_MSG_DELTABLE:
9165 nft_clear(trans->ctx.net, trans->ctx.table);
9166 nft_trans_destroy(trans);
9168 case NFT_MSG_NEWCHAIN:
9169 if (nft_trans_chain_update(trans)) {
9170 free_percpu(nft_trans_chain_stats(trans));
9171 kfree(nft_trans_chain_name(trans));
9172 nft_trans_destroy(trans);
9174 if (nft_chain_is_bound(trans->ctx.chain)) {
9175 nft_trans_destroy(trans);
9178 trans->ctx.table->use--;
9179 nft_chain_del(trans->ctx.chain);
9180 nf_tables_unregister_hook(trans->ctx.net,
9185 case NFT_MSG_DELCHAIN:
9186 trans->ctx.table->use++;
9187 nft_clear(trans->ctx.net, trans->ctx.chain);
9188 nft_trans_destroy(trans);
9190 case NFT_MSG_NEWRULE:
9191 trans->ctx.chain->use--;
9192 list_del_rcu(&nft_trans_rule(trans)->list);
9193 nft_rule_expr_deactivate(&trans->ctx,
9194 nft_trans_rule(trans),
9196 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9197 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9199 case NFT_MSG_DELRULE:
9200 trans->ctx.chain->use++;
9201 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9202 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9203 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9204 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9206 nft_trans_destroy(trans);
9208 case NFT_MSG_NEWSET:
9209 trans->ctx.table->use--;
9210 if (nft_trans_set_bound(trans)) {
9211 nft_trans_destroy(trans);
9214 list_del_rcu(&nft_trans_set(trans)->list);
9216 case NFT_MSG_DELSET:
9217 trans->ctx.table->use++;
9218 nft_clear(trans->ctx.net, nft_trans_set(trans));
9219 nft_trans_destroy(trans);
9221 case NFT_MSG_NEWSETELEM:
9222 if (nft_trans_elem_set_bound(trans)) {
9223 nft_trans_destroy(trans);
9226 te = (struct nft_trans_elem *)trans->data;
9227 nft_setelem_remove(net, te->set, &te->elem);
9228 if (!nft_setelem_is_catchall(te->set, &te->elem))
9229 atomic_dec(&te->set->nelems);
9231 case NFT_MSG_DELSETELEM:
9232 te = (struct nft_trans_elem *)trans->data;
9234 nft_setelem_data_activate(net, te->set, &te->elem);
9235 nft_setelem_activate(net, te->set, &te->elem);
9236 if (!nft_setelem_is_catchall(te->set, &te->elem))
9239 nft_trans_destroy(trans);
9241 case NFT_MSG_NEWOBJ:
9242 if (nft_trans_obj_update(trans)) {
9243 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9244 nft_trans_destroy(trans);
9246 trans->ctx.table->use--;
9247 nft_obj_del(nft_trans_obj(trans));
9250 case NFT_MSG_DELOBJ:
9251 trans->ctx.table->use++;
9252 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9253 nft_trans_destroy(trans);
9255 case NFT_MSG_NEWFLOWTABLE:
9256 if (nft_trans_flowtable_update(trans)) {
9257 nft_unregister_flowtable_net_hooks(net,
9258 &nft_trans_flowtable_hooks(trans));
9260 trans->ctx.table->use--;
9261 list_del_rcu(&nft_trans_flowtable(trans)->list);
9262 nft_unregister_flowtable_net_hooks(net,
9263 &nft_trans_flowtable(trans)->hook_list);
9266 case NFT_MSG_DELFLOWTABLE:
9267 if (nft_trans_flowtable_update(trans)) {
9268 list_splice(&nft_trans_flowtable_hooks(trans),
9269 &nft_trans_flowtable(trans)->hook_list);
9271 trans->ctx.table->use++;
9272 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9274 nft_trans_destroy(trans);
9281 list_for_each_entry_safe_reverse(trans, next,
9282 &nft_net->commit_list, list) {
9283 list_del(&trans->list);
9284 nf_tables_abort_release(trans);
9287 if (action == NFNL_ABORT_AUTOLOAD)
9288 nf_tables_module_autoload(net);
9290 nf_tables_module_autoload_cleanup(net);
9295 static void nf_tables_cleanup(struct net *net)
9297 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9300 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9301 enum nfnl_abort_action action)
9303 struct nftables_pernet *nft_net = nft_pernet(net);
9304 int ret = __nf_tables_abort(net, action);
9306 mutex_unlock(&nft_net->commit_mutex);
9311 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9313 struct nftables_pernet *nft_net = nft_pernet(net);
9316 mutex_lock(&nft_net->commit_mutex);
9318 genid_ok = genid == 0 || nft_net->base_seq == genid;
9320 mutex_unlock(&nft_net->commit_mutex);
9322 /* else, commit mutex has to be released by commit or abort function */
9326 static const struct nfnetlink_subsystem nf_tables_subsys = {
9327 .name = "nf_tables",
9328 .subsys_id = NFNL_SUBSYS_NFTABLES,
9329 .cb_count = NFT_MSG_MAX,
9331 .commit = nf_tables_commit,
9332 .abort = nf_tables_abort,
9333 .cleanup = nf_tables_cleanup,
9334 .valid_genid = nf_tables_valid_genid,
9335 .owner = THIS_MODULE,
9338 int nft_chain_validate_dependency(const struct nft_chain *chain,
9339 enum nft_chain_types type)
9341 const struct nft_base_chain *basechain;
9343 if (nft_is_base_chain(chain)) {
9344 basechain = nft_base_chain(chain);
9345 if (basechain->type->type != type)
9350 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9352 int nft_chain_validate_hooks(const struct nft_chain *chain,
9353 unsigned int hook_flags)
9355 struct nft_base_chain *basechain;
9357 if (nft_is_base_chain(chain)) {
9358 basechain = nft_base_chain(chain);
9360 if ((1 << basechain->ops.hooknum) & hook_flags)
9368 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9371 * Loop detection - walk through the ruleset beginning at the destination chain
9372 * of a new jump until either the source chain is reached (loop) or all
9373 * reachable chains have been traversed.
9375 * The loop check is performed whenever a new jump verdict is added to an
9376 * expression or verdict map or a verdict map is bound to a new chain.
9379 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9380 const struct nft_chain *chain);
9382 static int nft_check_loops(const struct nft_ctx *ctx,
9383 const struct nft_set_ext *ext)
9385 const struct nft_data *data;
9388 data = nft_set_ext_data(ext);
9389 switch (data->verdict.code) {
9392 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9402 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9403 struct nft_set *set,
9404 const struct nft_set_iter *iter,
9405 struct nft_set_elem *elem)
9407 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9409 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9410 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9413 return nft_check_loops(ctx, ext);
9416 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9417 struct nft_set *set)
9419 u8 genmask = nft_genmask_next(ctx->net);
9420 struct nft_set_elem_catchall *catchall;
9421 struct nft_set_ext *ext;
9424 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9425 ext = nft_set_elem_ext(set, catchall->elem);
9426 if (!nft_set_elem_active(ext, genmask))
9429 ret = nft_check_loops(ctx, ext);
9437 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9438 const struct nft_chain *chain)
9440 const struct nft_rule *rule;
9441 const struct nft_expr *expr, *last;
9442 struct nft_set *set;
9443 struct nft_set_binding *binding;
9444 struct nft_set_iter iter;
9446 if (ctx->chain == chain)
9449 list_for_each_entry(rule, &chain->rules, list) {
9450 nft_rule_for_each_expr(expr, last, rule) {
9451 struct nft_immediate_expr *priv;
9452 const struct nft_data *data;
9455 if (strcmp(expr->ops->type->name, "immediate"))
9458 priv = nft_expr_priv(expr);
9459 if (priv->dreg != NFT_REG_VERDICT)
9463 switch (data->verdict.code) {
9466 err = nf_tables_check_loops(ctx,
9467 data->verdict.chain);
9477 list_for_each_entry(set, &ctx->table->sets, list) {
9478 if (!nft_is_active_next(ctx->net, set))
9480 if (!(set->flags & NFT_SET_MAP) ||
9481 set->dtype != NFT_DATA_VERDICT)
9484 list_for_each_entry(binding, &set->bindings, list) {
9485 if (!(binding->flags & NFT_SET_MAP) ||
9486 binding->chain != chain)
9489 iter.genmask = nft_genmask_next(ctx->net);
9493 iter.fn = nf_tables_loop_check_setelem;
9495 set->ops->walk(ctx, set, &iter);
9497 iter.err = nft_set_catchall_loops(ctx, set);
9508 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9510 * @attr: netlink attribute to fetch value from
9511 * @max: maximum value to be stored in dest
9512 * @dest: pointer to the variable
9514 * Parse, check and store a given u32 netlink attribute into variable.
9515 * This function returns -ERANGE if the value goes over maximum value.
9516 * Otherwise a 0 is returned and the attribute value is stored in the
9517 * destination variable.
9519 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9523 val = ntohl(nla_get_be32(attr));
9530 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9532 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9536 reg = ntohl(nla_get_be32(attr));
9538 case NFT_REG_VERDICT...NFT_REG_4:
9539 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9541 case NFT_REG32_00...NFT_REG32_15:
9542 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9552 * nft_dump_register - dump a register value to a netlink attribute
9554 * @skb: socket buffer
9555 * @attr: attribute number
9556 * @reg: register number
9558 * Construct a netlink attribute containing the register number. For
9559 * compatibility reasons, register numbers being a multiple of 4 are
9560 * translated to the corresponding 128 bit register numbers.
9562 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9564 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9565 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9567 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9569 return nla_put_be32(skb, attr, htonl(reg));
9571 EXPORT_SYMBOL_GPL(nft_dump_register);
9573 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9575 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9579 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9585 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9590 err = nft_parse_register(attr, ®);
9594 err = nft_validate_register_load(reg, len);
9601 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9603 static int nft_validate_register_store(const struct nft_ctx *ctx,
9604 enum nft_registers reg,
9605 const struct nft_data *data,
9606 enum nft_data_types type,
9612 case NFT_REG_VERDICT:
9613 if (type != NFT_DATA_VERDICT)
9617 (data->verdict.code == NFT_GOTO ||
9618 data->verdict.code == NFT_JUMP)) {
9619 err = nf_tables_check_loops(ctx, data->verdict.chain);
9626 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9630 if (reg * NFT_REG32_SIZE + len >
9631 sizeof_field(struct nft_regs, data))
9634 if (data != NULL && type != NFT_DATA_VALUE)
9640 int nft_parse_register_store(const struct nft_ctx *ctx,
9641 const struct nlattr *attr, u8 *dreg,
9642 const struct nft_data *data,
9643 enum nft_data_types type, unsigned int len)
9648 err = nft_parse_register(attr, ®);
9652 err = nft_validate_register_store(ctx, reg, data, type, len);
9659 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9661 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9662 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9663 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9664 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9665 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9668 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9669 struct nft_data_desc *desc, const struct nlattr *nla)
9671 u8 genmask = nft_genmask_next(ctx->net);
9672 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9673 struct nft_chain *chain;
9676 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9677 nft_verdict_policy, NULL);
9681 if (!tb[NFTA_VERDICT_CODE])
9683 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9685 switch (data->verdict.code) {
9687 switch (data->verdict.code & NF_VERDICT_MASK) {
9702 if (tb[NFTA_VERDICT_CHAIN]) {
9703 chain = nft_chain_lookup(ctx->net, ctx->table,
9704 tb[NFTA_VERDICT_CHAIN],
9706 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9707 chain = nft_chain_lookup_byid(ctx->net, ctx->table,
9708 tb[NFTA_VERDICT_CHAIN_ID]);
9710 return PTR_ERR(chain);
9716 return PTR_ERR(chain);
9717 if (nft_is_base_chain(chain))
9719 if (nft_chain_is_bound(chain))
9721 if (desc->flags & NFT_DATA_DESC_SETELEM &&
9722 chain->flags & NFT_CHAIN_BINDING)
9726 data->verdict.chain = chain;
9730 desc->len = sizeof(data->verdict);
9735 static void nft_verdict_uninit(const struct nft_data *data)
9737 struct nft_chain *chain;
9738 struct nft_rule *rule;
9740 switch (data->verdict.code) {
9743 chain = data->verdict.chain;
9746 if (!nft_chain_is_bound(chain))
9749 chain->table->use--;
9750 list_for_each_entry(rule, &chain->rules, list)
9753 nft_chain_del(chain);
9758 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9760 struct nlattr *nest;
9762 nest = nla_nest_start_noflag(skb, type);
9764 goto nla_put_failure;
9766 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9767 goto nla_put_failure;
9772 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9774 goto nla_put_failure;
9776 nla_nest_end(skb, nest);
9783 static int nft_value_init(const struct nft_ctx *ctx,
9784 struct nft_data *data, struct nft_data_desc *desc,
9785 const struct nlattr *nla)
9792 if (len > desc->size)
9795 if (len != desc->len)
9801 nla_memcpy(data->data, nla, len);
9806 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9809 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9812 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9813 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9814 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9818 * nft_data_init - parse nf_tables data netlink attributes
9820 * @ctx: context of the expression using the data
9821 * @data: destination struct nft_data
9822 * @desc: data description
9823 * @nla: netlink attribute containing data
9825 * Parse the netlink data attributes and initialize a struct nft_data.
9826 * The type and length of data are returned in the data description.
9828 * The caller can indicate that it only wants to accept data of type
9829 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9831 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
9832 struct nft_data_desc *desc, const struct nlattr *nla)
9834 struct nlattr *tb[NFTA_DATA_MAX + 1];
9837 if (WARN_ON_ONCE(!desc->size))
9840 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9841 nft_data_policy, NULL);
9845 if (tb[NFTA_DATA_VALUE]) {
9846 if (desc->type != NFT_DATA_VALUE)
9849 err = nft_value_init(ctx, data, desc, tb[NFTA_DATA_VALUE]);
9850 } else if (tb[NFTA_DATA_VERDICT] && ctx != NULL) {
9851 if (desc->type != NFT_DATA_VERDICT)
9854 err = nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9861 EXPORT_SYMBOL_GPL(nft_data_init);
9864 * nft_data_release - release a nft_data item
9866 * @data: struct nft_data to release
9867 * @type: type of data
9869 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9870 * all others need to be released by calling this function.
9872 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9874 if (type < NFT_DATA_VERDICT)
9877 case NFT_DATA_VERDICT:
9878 return nft_verdict_uninit(data);
9883 EXPORT_SYMBOL_GPL(nft_data_release);
9885 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9886 enum nft_data_types type, unsigned int len)
9888 struct nlattr *nest;
9891 nest = nla_nest_start_noflag(skb, attr);
9896 case NFT_DATA_VALUE:
9897 err = nft_value_dump(skb, data, len);
9899 case NFT_DATA_VERDICT:
9900 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9907 nla_nest_end(skb, nest);
9910 EXPORT_SYMBOL_GPL(nft_data_dump);
9912 int __nft_release_basechain(struct nft_ctx *ctx)
9914 struct nft_rule *rule, *nr;
9916 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9919 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9920 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9921 list_del(&rule->list);
9923 nf_tables_rule_release(ctx, rule);
9925 nft_chain_del(ctx->chain);
9927 nf_tables_chain_destroy(ctx);
9931 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9933 static void __nft_release_hook(struct net *net, struct nft_table *table)
9935 struct nft_flowtable *flowtable;
9936 struct nft_chain *chain;
9938 list_for_each_entry(chain, &table->chains, list)
9939 __nf_tables_unregister_hook(net, table, chain, true);
9940 list_for_each_entry(flowtable, &table->flowtables, list)
9941 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9945 static void __nft_release_hooks(struct net *net)
9947 struct nftables_pernet *nft_net = nft_pernet(net);
9948 struct nft_table *table;
9950 list_for_each_entry(table, &nft_net->tables, list) {
9951 if (nft_table_has_owner(table))
9954 __nft_release_hook(net, table);
9958 static void __nft_release_table(struct net *net, struct nft_table *table)
9960 struct nft_flowtable *flowtable, *nf;
9961 struct nft_chain *chain, *nc;
9962 struct nft_object *obj, *ne;
9963 struct nft_rule *rule, *nr;
9964 struct nft_set *set, *ns;
9965 struct nft_ctx ctx = {
9967 .family = NFPROTO_NETDEV,
9970 ctx.family = table->family;
9972 list_for_each_entry(chain, &table->chains, list) {
9974 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9975 list_del(&rule->list);
9977 nf_tables_rule_release(&ctx, rule);
9980 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9981 list_del(&flowtable->list);
9983 nf_tables_flowtable_destroy(flowtable);
9985 list_for_each_entry_safe(set, ns, &table->sets, list) {
9986 list_del(&set->list);
9988 nft_set_destroy(&ctx, set);
9990 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9993 nft_obj_destroy(&ctx, obj);
9995 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9997 nft_chain_del(chain);
9999 nf_tables_chain_destroy(&ctx);
10001 nf_tables_table_destroy(&ctx);
10004 static void __nft_release_tables(struct net *net)
10006 struct nftables_pernet *nft_net = nft_pernet(net);
10007 struct nft_table *table, *nt;
10009 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
10010 if (nft_table_has_owner(table))
10013 list_del(&table->list);
10015 __nft_release_table(net, table);
10019 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
10022 struct nft_table *table, *to_delete[8];
10023 struct nftables_pernet *nft_net;
10024 struct netlink_notify *n = ptr;
10025 struct net *net = n->net;
10026 unsigned int deleted;
10027 bool restart = false;
10029 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
10030 return NOTIFY_DONE;
10032 nft_net = nft_pernet(net);
10034 mutex_lock(&nft_net->commit_mutex);
10035 if (!list_empty(&nf_tables_destroy_list))
10038 list_for_each_entry(table, &nft_net->tables, list) {
10039 if (nft_table_has_owner(table) &&
10040 n->portid == table->nlpid) {
10041 __nft_release_hook(net, table);
10042 list_del_rcu(&table->list);
10043 to_delete[deleted++] = table;
10044 if (deleted >= ARRAY_SIZE(to_delete))
10049 restart = deleted >= ARRAY_SIZE(to_delete);
10052 __nft_release_table(net, to_delete[--deleted]);
10057 mutex_unlock(&nft_net->commit_mutex);
10059 return NOTIFY_DONE;
10062 static struct notifier_block nft_nl_notifier = {
10063 .notifier_call = nft_rcv_nl_event,
10066 static int __net_init nf_tables_init_net(struct net *net)
10068 struct nftables_pernet *nft_net = nft_pernet(net);
10070 INIT_LIST_HEAD(&nft_net->tables);
10071 INIT_LIST_HEAD(&nft_net->commit_list);
10072 INIT_LIST_HEAD(&nft_net->module_list);
10073 INIT_LIST_HEAD(&nft_net->notify_list);
10074 mutex_init(&nft_net->commit_mutex);
10075 nft_net->base_seq = 1;
10076 nft_net->validate_state = NFT_VALIDATE_SKIP;
10081 static void __net_exit nf_tables_pre_exit_net(struct net *net)
10083 struct nftables_pernet *nft_net = nft_pernet(net);
10085 mutex_lock(&nft_net->commit_mutex);
10086 __nft_release_hooks(net);
10087 mutex_unlock(&nft_net->commit_mutex);
10090 static void __net_exit nf_tables_exit_net(struct net *net)
10092 struct nftables_pernet *nft_net = nft_pernet(net);
10094 mutex_lock(&nft_net->commit_mutex);
10095 if (!list_empty(&nft_net->commit_list) ||
10096 !list_empty(&nft_net->module_list))
10097 __nf_tables_abort(net, NFNL_ABORT_NONE);
10098 __nft_release_tables(net);
10099 mutex_unlock(&nft_net->commit_mutex);
10100 WARN_ON_ONCE(!list_empty(&nft_net->tables));
10101 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
10102 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
10105 static struct pernet_operations nf_tables_net_ops = {
10106 .init = nf_tables_init_net,
10107 .pre_exit = nf_tables_pre_exit_net,
10108 .exit = nf_tables_exit_net,
10109 .id = &nf_tables_net_id,
10110 .size = sizeof(struct nftables_pernet),
10113 static int __init nf_tables_module_init(void)
10117 err = register_pernet_subsys(&nf_tables_net_ops);
10121 err = nft_chain_filter_init();
10123 goto err_chain_filter;
10125 err = nf_tables_core_module_init();
10127 goto err_core_module;
10129 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
10131 goto err_netdev_notifier;
10133 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
10135 goto err_rht_objname;
10137 err = nft_offload_init();
10141 err = netlink_register_notifier(&nft_nl_notifier);
10143 goto err_netlink_notifier;
10146 err = nfnetlink_subsys_register(&nf_tables_subsys);
10148 goto err_nfnl_subsys;
10150 nft_chain_route_init();
10155 netlink_unregister_notifier(&nft_nl_notifier);
10156 err_netlink_notifier:
10157 nft_offload_exit();
10159 rhltable_destroy(&nft_objname_ht);
10161 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10162 err_netdev_notifier:
10163 nf_tables_core_module_exit();
10165 nft_chain_filter_fini();
10167 unregister_pernet_subsys(&nf_tables_net_ops);
10171 static void __exit nf_tables_module_exit(void)
10173 nfnetlink_subsys_unregister(&nf_tables_subsys);
10174 netlink_unregister_notifier(&nft_nl_notifier);
10175 nft_offload_exit();
10176 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10177 nft_chain_filter_fini();
10178 nft_chain_route_fini();
10179 unregister_pernet_subsys(&nf_tables_net_ops);
10180 cancel_work_sync(&trans_destroy_work);
10182 rhltable_destroy(&nft_objname_ht);
10183 nf_tables_core_module_exit();
10186 module_init(nf_tables_module_init);
10187 module_exit(nf_tables_module_exit);
10189 MODULE_LICENSE("GPL");
10190 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10191 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);