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);
35 static u64 table_handle;
38 NFT_VALIDATE_SKIP = 0,
43 static struct rhltable nft_objname_ht;
45 static u32 nft_chain_hash(const void *data, u32 len, u32 seed);
46 static u32 nft_chain_hash_obj(const void *data, u32 len, u32 seed);
47 static int nft_chain_hash_cmp(struct rhashtable_compare_arg *, const void *);
49 static u32 nft_objname_hash(const void *data, u32 len, u32 seed);
50 static u32 nft_objname_hash_obj(const void *data, u32 len, u32 seed);
51 static int nft_objname_hash_cmp(struct rhashtable_compare_arg *, const void *);
53 static const struct rhashtable_params nft_chain_ht_params = {
54 .head_offset = offsetof(struct nft_chain, rhlhead),
55 .key_offset = offsetof(struct nft_chain, name),
56 .hashfn = nft_chain_hash,
57 .obj_hashfn = nft_chain_hash_obj,
58 .obj_cmpfn = nft_chain_hash_cmp,
59 .automatic_shrinking = true,
62 static const struct rhashtable_params nft_objname_ht_params = {
63 .head_offset = offsetof(struct nft_object, rhlhead),
64 .key_offset = offsetof(struct nft_object, key),
65 .hashfn = nft_objname_hash,
66 .obj_hashfn = nft_objname_hash_obj,
67 .obj_cmpfn = nft_objname_hash_cmp,
68 .automatic_shrinking = true,
71 struct nft_audit_data {
72 struct nft_table *table;
75 struct list_head list;
78 static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum nf_tables_msg_types
79 [NFT_MSG_NEWTABLE] = AUDIT_NFT_OP_TABLE_REGISTER,
80 [NFT_MSG_GETTABLE] = AUDIT_NFT_OP_INVALID,
81 [NFT_MSG_DELTABLE] = AUDIT_NFT_OP_TABLE_UNREGISTER,
82 [NFT_MSG_NEWCHAIN] = AUDIT_NFT_OP_CHAIN_REGISTER,
83 [NFT_MSG_GETCHAIN] = AUDIT_NFT_OP_INVALID,
84 [NFT_MSG_DELCHAIN] = AUDIT_NFT_OP_CHAIN_UNREGISTER,
85 [NFT_MSG_NEWRULE] = AUDIT_NFT_OP_RULE_REGISTER,
86 [NFT_MSG_GETRULE] = AUDIT_NFT_OP_INVALID,
87 [NFT_MSG_DELRULE] = AUDIT_NFT_OP_RULE_UNREGISTER,
88 [NFT_MSG_NEWSET] = AUDIT_NFT_OP_SET_REGISTER,
89 [NFT_MSG_GETSET] = AUDIT_NFT_OP_INVALID,
90 [NFT_MSG_DELSET] = AUDIT_NFT_OP_SET_UNREGISTER,
91 [NFT_MSG_NEWSETELEM] = AUDIT_NFT_OP_SETELEM_REGISTER,
92 [NFT_MSG_GETSETELEM] = AUDIT_NFT_OP_INVALID,
93 [NFT_MSG_DELSETELEM] = AUDIT_NFT_OP_SETELEM_UNREGISTER,
94 [NFT_MSG_NEWGEN] = AUDIT_NFT_OP_GEN_REGISTER,
95 [NFT_MSG_GETGEN] = AUDIT_NFT_OP_INVALID,
96 [NFT_MSG_TRACE] = AUDIT_NFT_OP_INVALID,
97 [NFT_MSG_NEWOBJ] = AUDIT_NFT_OP_OBJ_REGISTER,
98 [NFT_MSG_GETOBJ] = AUDIT_NFT_OP_INVALID,
99 [NFT_MSG_DELOBJ] = AUDIT_NFT_OP_OBJ_UNREGISTER,
100 [NFT_MSG_GETOBJ_RESET] = AUDIT_NFT_OP_OBJ_RESET,
101 [NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
102 [NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
103 [NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
106 static void nft_validate_state_update(struct net *net, u8 new_validate_state)
108 struct nftables_pernet *nft_net = nft_pernet(net);
110 switch (nft_net->validate_state) {
111 case NFT_VALIDATE_SKIP:
112 WARN_ON_ONCE(new_validate_state == NFT_VALIDATE_DO);
114 case NFT_VALIDATE_NEED:
116 case NFT_VALIDATE_DO:
117 if (new_validate_state == NFT_VALIDATE_NEED)
121 nft_net->validate_state = new_validate_state;
123 static void nf_tables_trans_destroy_work(struct work_struct *w);
124 static DECLARE_WORK(trans_destroy_work, nf_tables_trans_destroy_work);
126 static void nft_ctx_init(struct nft_ctx *ctx,
128 const struct sk_buff *skb,
129 const struct nlmsghdr *nlh,
131 struct nft_table *table,
132 struct nft_chain *chain,
133 const struct nlattr * const *nla)
136 ctx->family = family;
141 ctx->portid = NETLINK_CB(skb).portid;
142 ctx->report = nlmsg_report(nlh);
143 ctx->flags = nlh->nlmsg_flags;
144 ctx->seq = nlh->nlmsg_seq;
147 static struct nft_trans *nft_trans_alloc_gfp(const struct nft_ctx *ctx,
148 int msg_type, u32 size, gfp_t gfp)
150 struct nft_trans *trans;
152 trans = kzalloc(sizeof(struct nft_trans) + size, gfp);
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 strlcpy(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 = 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 = ++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 = 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))
2172 flow_block_init(&basechain->flow_block);
2177 static int nft_chain_add(struct nft_table *table, struct nft_chain *chain)
2181 err = rhltable_insert_key(&table->chains_ht, chain->name,
2182 &chain->rhlhead, nft_chain_ht_params);
2186 list_add_tail_rcu(&chain->list, &table->chains);
2191 static u64 chain_id;
2193 static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
2194 u8 policy, u32 flags,
2195 struct netlink_ext_ack *extack)
2197 const struct nlattr * const *nla = ctx->nla;
2198 struct nft_table *table = ctx->table;
2199 struct nft_base_chain *basechain;
2200 struct nft_stats __percpu *stats;
2201 struct net *net = ctx->net;
2202 char name[NFT_NAME_MAXLEN];
2203 struct nft_rule_blob *blob;
2204 struct nft_trans *trans;
2205 struct nft_chain *chain;
2206 unsigned int data_size;
2209 if (table->use == UINT_MAX)
2212 if (nla[NFTA_CHAIN_HOOK]) {
2213 struct nft_chain_hook hook;
2215 if (flags & NFT_CHAIN_BINDING)
2218 err = nft_chain_parse_hook(net, nla, &hook, family, extack,
2223 basechain = kzalloc(sizeof(*basechain), GFP_KERNEL_ACCOUNT);
2224 if (basechain == NULL) {
2225 nft_chain_release_hook(&hook);
2228 chain = &basechain->chain;
2230 if (nla[NFTA_CHAIN_COUNTERS]) {
2231 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2232 if (IS_ERR(stats)) {
2233 nft_chain_release_hook(&hook);
2235 return PTR_ERR(stats);
2237 rcu_assign_pointer(basechain->stats, stats);
2238 static_branch_inc(&nft_counters_enabled);
2241 err = nft_basechain_init(basechain, family, &hook, flags);
2243 nft_chain_release_hook(&hook);
2248 if (flags & NFT_CHAIN_BASE)
2250 if (flags & NFT_CHAIN_HW_OFFLOAD)
2253 chain = kzalloc(sizeof(*chain), GFP_KERNEL_ACCOUNT);
2257 chain->flags = flags;
2261 INIT_LIST_HEAD(&chain->rules);
2262 chain->handle = nf_tables_alloc_handle(table);
2263 chain->table = table;
2265 if (nla[NFTA_CHAIN_NAME]) {
2266 chain->name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2268 if (!(flags & NFT_CHAIN_BINDING)) {
2270 goto err_destroy_chain;
2273 snprintf(name, sizeof(name), "__chain%llu", ++chain_id);
2274 chain->name = kstrdup(name, GFP_KERNEL_ACCOUNT);
2279 goto err_destroy_chain;
2282 if (nla[NFTA_CHAIN_USERDATA]) {
2283 chain->udata = nla_memdup(nla[NFTA_CHAIN_USERDATA], GFP_KERNEL_ACCOUNT);
2284 if (chain->udata == NULL) {
2286 goto err_destroy_chain;
2288 chain->udlen = nla_len(nla[NFTA_CHAIN_USERDATA]);
2291 data_size = offsetof(struct nft_rule_dp, data); /* last rule */
2292 blob = nf_tables_chain_alloc_rules(data_size);
2295 goto err_destroy_chain;
2298 RCU_INIT_POINTER(chain->blob_gen_0, blob);
2299 RCU_INIT_POINTER(chain->blob_gen_1, blob);
2301 err = nf_tables_register_hook(net, table, chain);
2303 goto err_destroy_chain;
2305 trans = nft_trans_chain_add(ctx, NFT_MSG_NEWCHAIN);
2306 if (IS_ERR(trans)) {
2307 err = PTR_ERR(trans);
2308 goto err_unregister_hook;
2311 nft_trans_chain_policy(trans) = NFT_CHAIN_POLICY_UNSET;
2312 if (nft_is_base_chain(chain))
2313 nft_trans_chain_policy(trans) = policy;
2315 err = nft_chain_add(table, chain);
2317 nft_trans_destroy(trans);
2318 goto err_unregister_hook;
2324 err_unregister_hook:
2325 nf_tables_unregister_hook(net, table, chain);
2327 nf_tables_chain_destroy(ctx);
2332 static bool nft_hook_list_equal(struct list_head *hook_list1,
2333 struct list_head *hook_list2)
2335 struct nft_hook *hook;
2339 list_for_each_entry(hook, hook_list2, list) {
2340 if (!nft_hook_list_find(hook_list1, hook))
2345 list_for_each_entry(hook, hook_list1, list)
2351 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
2352 u32 flags, const struct nlattr *attr,
2353 struct netlink_ext_ack *extack)
2355 const struct nlattr * const *nla = ctx->nla;
2356 struct nft_table *table = ctx->table;
2357 struct nft_chain *chain = ctx->chain;
2358 struct nft_base_chain *basechain;
2359 struct nft_stats *stats = NULL;
2360 struct nft_chain_hook hook;
2361 struct nf_hook_ops *ops;
2362 struct nft_trans *trans;
2365 if (chain->flags ^ flags)
2368 if (nla[NFTA_CHAIN_HOOK]) {
2369 if (!nft_is_base_chain(chain)) {
2370 NL_SET_BAD_ATTR(extack, attr);
2373 err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
2378 basechain = nft_base_chain(chain);
2379 if (basechain->type != hook.type) {
2380 nft_chain_release_hook(&hook);
2381 NL_SET_BAD_ATTR(extack, attr);
2385 if (nft_base_chain_netdev(ctx->family, hook.num)) {
2386 if (!nft_hook_list_equal(&basechain->hook_list,
2388 nft_chain_release_hook(&hook);
2389 NL_SET_BAD_ATTR(extack, attr);
2393 ops = &basechain->ops;
2394 if (ops->hooknum != hook.num ||
2395 ops->priority != hook.priority) {
2396 nft_chain_release_hook(&hook);
2397 NL_SET_BAD_ATTR(extack, attr);
2401 nft_chain_release_hook(&hook);
2404 if (nla[NFTA_CHAIN_HANDLE] &&
2405 nla[NFTA_CHAIN_NAME]) {
2406 struct nft_chain *chain2;
2408 chain2 = nft_chain_lookup(ctx->net, table,
2409 nla[NFTA_CHAIN_NAME], genmask);
2410 if (!IS_ERR(chain2)) {
2411 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2416 if (nla[NFTA_CHAIN_COUNTERS]) {
2417 if (!nft_is_base_chain(chain))
2420 stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
2422 return PTR_ERR(stats);
2426 trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
2427 sizeof(struct nft_trans_chain));
2431 nft_trans_chain_stats(trans) = stats;
2432 nft_trans_chain_update(trans) = true;
2434 if (nla[NFTA_CHAIN_POLICY])
2435 nft_trans_chain_policy(trans) = policy;
2437 nft_trans_chain_policy(trans) = -1;
2439 if (nla[NFTA_CHAIN_HANDLE] &&
2440 nla[NFTA_CHAIN_NAME]) {
2441 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
2442 struct nft_trans *tmp;
2446 name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
2451 list_for_each_entry(tmp, &nft_net->commit_list, list) {
2452 if (tmp->msg_type == NFT_MSG_NEWCHAIN &&
2453 tmp->ctx.table == table &&
2454 nft_trans_chain_update(tmp) &&
2455 nft_trans_chain_name(tmp) &&
2456 strcmp(name, nft_trans_chain_name(tmp)) == 0) {
2457 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
2463 nft_trans_chain_name(trans) = name;
2465 nft_trans_commit_list_add_tail(ctx->net, trans);
2474 static struct nft_chain *nft_chain_lookup_byid(const struct net *net,
2475 const struct nlattr *nla)
2477 struct nftables_pernet *nft_net = nft_pernet(net);
2478 u32 id = ntohl(nla_get_be32(nla));
2479 struct nft_trans *trans;
2481 list_for_each_entry(trans, &nft_net->commit_list, list) {
2482 struct nft_chain *chain = trans->ctx.chain;
2484 if (trans->msg_type == NFT_MSG_NEWCHAIN &&
2485 id == nft_trans_chain_id(trans))
2488 return ERR_PTR(-ENOENT);
2491 static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
2492 const struct nlattr * const nla[])
2494 struct nftables_pernet *nft_net = nft_pernet(info->net);
2495 struct netlink_ext_ack *extack = info->extack;
2496 u8 genmask = nft_genmask_next(info->net);
2497 u8 family = info->nfmsg->nfgen_family;
2498 struct nft_chain *chain = NULL;
2499 struct net *net = info->net;
2500 const struct nlattr *attr;
2501 struct nft_table *table;
2502 u8 policy = NF_ACCEPT;
2507 lockdep_assert_held(&nft_net->commit_mutex);
2509 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2510 NETLINK_CB(skb).portid);
2511 if (IS_ERR(table)) {
2512 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2513 return PTR_ERR(table);
2517 attr = nla[NFTA_CHAIN_NAME];
2519 if (nla[NFTA_CHAIN_HANDLE]) {
2520 handle = be64_to_cpu(nla_get_be64(nla[NFTA_CHAIN_HANDLE]));
2521 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2522 if (IS_ERR(chain)) {
2523 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_HANDLE]);
2524 return PTR_ERR(chain);
2526 attr = nla[NFTA_CHAIN_HANDLE];
2527 } else if (nla[NFTA_CHAIN_NAME]) {
2528 chain = nft_chain_lookup(net, table, attr, genmask);
2529 if (IS_ERR(chain)) {
2530 if (PTR_ERR(chain) != -ENOENT) {
2531 NL_SET_BAD_ATTR(extack, attr);
2532 return PTR_ERR(chain);
2536 } else if (!nla[NFTA_CHAIN_ID]) {
2540 if (nla[NFTA_CHAIN_POLICY]) {
2541 if (chain != NULL &&
2542 !nft_is_base_chain(chain)) {
2543 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2547 if (chain == NULL &&
2548 nla[NFTA_CHAIN_HOOK] == NULL) {
2549 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_POLICY]);
2553 policy = ntohl(nla_get_be32(nla[NFTA_CHAIN_POLICY]));
2563 if (nla[NFTA_CHAIN_FLAGS])
2564 flags = ntohl(nla_get_be32(nla[NFTA_CHAIN_FLAGS]));
2566 flags = chain->flags;
2568 if (flags & ~NFT_CHAIN_FLAGS)
2571 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2573 if (chain != NULL) {
2574 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
2575 NL_SET_BAD_ATTR(extack, attr);
2578 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
2581 flags |= chain->flags & NFT_CHAIN_BASE;
2582 return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
2586 return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
2589 static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
2590 const struct nlattr * const nla[])
2592 struct netlink_ext_ack *extack = info->extack;
2593 u8 genmask = nft_genmask_next(info->net);
2594 u8 family = info->nfmsg->nfgen_family;
2595 struct net *net = info->net;
2596 const struct nlattr *attr;
2597 struct nft_table *table;
2598 struct nft_chain *chain;
2599 struct nft_rule *rule;
2605 table = nft_table_lookup(net, nla[NFTA_CHAIN_TABLE], family, genmask,
2606 NETLINK_CB(skb).portid);
2607 if (IS_ERR(table)) {
2608 NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TABLE]);
2609 return PTR_ERR(table);
2612 if (nla[NFTA_CHAIN_HANDLE]) {
2613 attr = nla[NFTA_CHAIN_HANDLE];
2614 handle = be64_to_cpu(nla_get_be64(attr));
2615 chain = nft_chain_lookup_byhandle(table, handle, genmask);
2617 attr = nla[NFTA_CHAIN_NAME];
2618 chain = nft_chain_lookup(net, table, attr, genmask);
2620 if (IS_ERR(chain)) {
2621 NL_SET_BAD_ATTR(extack, attr);
2622 return PTR_ERR(chain);
2625 if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
2629 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
2632 list_for_each_entry(rule, &chain->rules, list) {
2633 if (!nft_is_active_next(net, rule))
2637 err = nft_delrule(&ctx, rule);
2642 /* There are rules and elements that are still holding references to us,
2643 * we cannot do a recursive removal in this case.
2646 NL_SET_BAD_ATTR(extack, attr);
2650 return nft_delchain(&ctx);
2658 * nft_register_expr - register nf_tables expr type
2661 * Registers the expr type for use with nf_tables. Returns zero on
2662 * success or a negative errno code otherwise.
2664 int nft_register_expr(struct nft_expr_type *type)
2666 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2667 if (type->family == NFPROTO_UNSPEC)
2668 list_add_tail_rcu(&type->list, &nf_tables_expressions);
2670 list_add_rcu(&type->list, &nf_tables_expressions);
2671 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2674 EXPORT_SYMBOL_GPL(nft_register_expr);
2677 * nft_unregister_expr - unregister nf_tables expr type
2680 * Unregisters the expr typefor use with nf_tables.
2682 void nft_unregister_expr(struct nft_expr_type *type)
2684 nfnl_lock(NFNL_SUBSYS_NFTABLES);
2685 list_del_rcu(&type->list);
2686 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
2688 EXPORT_SYMBOL_GPL(nft_unregister_expr);
2690 static const struct nft_expr_type *__nft_expr_type_get(u8 family,
2693 const struct nft_expr_type *type, *candidate = NULL;
2695 list_for_each_entry(type, &nf_tables_expressions, list) {
2696 if (!nla_strcmp(nla, type->name)) {
2697 if (!type->family && !candidate)
2699 else if (type->family == family)
2706 #ifdef CONFIG_MODULES
2707 static int nft_expr_type_request_module(struct net *net, u8 family,
2710 if (nft_request_module(net, "nft-expr-%u-%.*s", family,
2711 nla_len(nla), (char *)nla_data(nla)) == -EAGAIN)
2718 static const struct nft_expr_type *nft_expr_type_get(struct net *net,
2722 const struct nft_expr_type *type;
2725 return ERR_PTR(-EINVAL);
2727 type = __nft_expr_type_get(family, nla);
2728 if (type != NULL && try_module_get(type->owner))
2731 lockdep_nfnl_nft_mutex_not_held();
2732 #ifdef CONFIG_MODULES
2734 if (nft_expr_type_request_module(net, family, nla) == -EAGAIN)
2735 return ERR_PTR(-EAGAIN);
2737 if (nft_request_module(net, "nft-expr-%.*s",
2739 (char *)nla_data(nla)) == -EAGAIN)
2740 return ERR_PTR(-EAGAIN);
2743 return ERR_PTR(-ENOENT);
2746 static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
2747 [NFTA_EXPR_NAME] = { .type = NLA_STRING,
2748 .len = NFT_MODULE_AUTOLOAD_LIMIT },
2749 [NFTA_EXPR_DATA] = { .type = NLA_NESTED },
2752 static int nf_tables_fill_expr_info(struct sk_buff *skb,
2753 const struct nft_expr *expr)
2755 if (nla_put_string(skb, NFTA_EXPR_NAME, expr->ops->type->name))
2756 goto nla_put_failure;
2758 if (expr->ops->dump) {
2759 struct nlattr *data = nla_nest_start_noflag(skb,
2762 goto nla_put_failure;
2763 if (expr->ops->dump(skb, expr) < 0)
2764 goto nla_put_failure;
2765 nla_nest_end(skb, data);
2774 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
2775 const struct nft_expr *expr)
2777 struct nlattr *nest;
2779 nest = nla_nest_start_noflag(skb, attr);
2781 goto nla_put_failure;
2782 if (nf_tables_fill_expr_info(skb, expr) < 0)
2783 goto nla_put_failure;
2784 nla_nest_end(skb, nest);
2791 struct nft_expr_info {
2792 const struct nft_expr_ops *ops;
2793 const struct nlattr *attr;
2794 struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
2797 static int nf_tables_expr_parse(const struct nft_ctx *ctx,
2798 const struct nlattr *nla,
2799 struct nft_expr_info *info)
2801 const struct nft_expr_type *type;
2802 const struct nft_expr_ops *ops;
2803 struct nlattr *tb[NFTA_EXPR_MAX + 1];
2806 err = nla_parse_nested_deprecated(tb, NFTA_EXPR_MAX, nla,
2807 nft_expr_policy, NULL);
2811 type = nft_expr_type_get(ctx->net, ctx->family, tb[NFTA_EXPR_NAME]);
2813 return PTR_ERR(type);
2815 if (tb[NFTA_EXPR_DATA]) {
2816 err = nla_parse_nested_deprecated(info->tb, type->maxattr,
2818 type->policy, NULL);
2822 memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
2824 if (type->select_ops != NULL) {
2825 ops = type->select_ops(ctx,
2826 (const struct nlattr * const *)info->tb);
2829 #ifdef CONFIG_MODULES
2831 if (nft_expr_type_request_module(ctx->net,
2833 tb[NFTA_EXPR_NAME]) != -EAGAIN)
2847 module_put(type->owner);
2851 static int nf_tables_newexpr(const struct nft_ctx *ctx,
2852 const struct nft_expr_info *expr_info,
2853 struct nft_expr *expr)
2855 const struct nft_expr_ops *ops = expr_info->ops;
2860 err = ops->init(ctx, expr, (const struct nlattr **)expr_info->tb);
2871 static void nf_tables_expr_destroy(const struct nft_ctx *ctx,
2872 struct nft_expr *expr)
2874 const struct nft_expr_type *type = expr->ops->type;
2876 if (expr->ops->destroy)
2877 expr->ops->destroy(ctx, expr);
2878 module_put(type->owner);
2881 static struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
2882 const struct nlattr *nla)
2884 struct nft_expr_info expr_info;
2885 struct nft_expr *expr;
2886 struct module *owner;
2889 err = nf_tables_expr_parse(ctx, nla, &expr_info);
2891 goto err_expr_parse;
2894 if (!(expr_info.ops->type->flags & NFT_EXPR_STATEFUL))
2895 goto err_expr_stateful;
2898 expr = kzalloc(expr_info.ops->size, GFP_KERNEL_ACCOUNT);
2900 goto err_expr_stateful;
2902 err = nf_tables_newexpr(ctx, &expr_info, expr);
2910 owner = expr_info.ops->type->owner;
2911 if (expr_info.ops->type->release_ops)
2912 expr_info.ops->type->release_ops(expr_info.ops);
2916 return ERR_PTR(err);
2919 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
2923 if (src->ops->clone) {
2924 dst->ops = src->ops;
2925 err = src->ops->clone(dst, src);
2929 memcpy(dst, src, src->ops->size);
2932 __module_get(src->ops->type->owner);
2937 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr)
2939 nf_tables_expr_destroy(ctx, expr);
2947 static struct nft_rule *__nft_rule_lookup(const struct nft_chain *chain,
2950 struct nft_rule *rule;
2952 // FIXME: this sucks
2953 list_for_each_entry_rcu(rule, &chain->rules, list) {
2954 if (handle == rule->handle)
2958 return ERR_PTR(-ENOENT);
2961 static struct nft_rule *nft_rule_lookup(const struct nft_chain *chain,
2962 const struct nlattr *nla)
2965 return ERR_PTR(-EINVAL);
2967 return __nft_rule_lookup(chain, be64_to_cpu(nla_get_be64(nla)));
2970 static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
2971 [NFTA_RULE_TABLE] = { .type = NLA_STRING,
2972 .len = NFT_TABLE_MAXNAMELEN - 1 },
2973 [NFTA_RULE_CHAIN] = { .type = NLA_STRING,
2974 .len = NFT_CHAIN_MAXNAMELEN - 1 },
2975 [NFTA_RULE_HANDLE] = { .type = NLA_U64 },
2976 [NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
2977 [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
2978 [NFTA_RULE_POSITION] = { .type = NLA_U64 },
2979 [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
2980 .len = NFT_USERDATA_MAXLEN },
2981 [NFTA_RULE_ID] = { .type = NLA_U32 },
2982 [NFTA_RULE_POSITION_ID] = { .type = NLA_U32 },
2983 [NFTA_RULE_CHAIN_ID] = { .type = NLA_U32 },
2986 static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
2987 u32 portid, u32 seq, int event,
2988 u32 flags, int family,
2989 const struct nft_table *table,
2990 const struct nft_chain *chain,
2991 const struct nft_rule *rule, u64 handle)
2993 struct nlmsghdr *nlh;
2994 const struct nft_expr *expr, *next;
2995 struct nlattr *list;
2996 u16 type = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
2998 nlh = nfnl_msg_put(skb, portid, seq, type, flags, family, NFNETLINK_V0,
3001 goto nla_put_failure;
3003 if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
3004 goto nla_put_failure;
3005 if (nla_put_string(skb, NFTA_RULE_CHAIN, chain->name))
3006 goto nla_put_failure;
3007 if (nla_put_be64(skb, NFTA_RULE_HANDLE, cpu_to_be64(rule->handle),
3009 goto nla_put_failure;
3011 if (event != NFT_MSG_DELRULE && handle) {
3012 if (nla_put_be64(skb, NFTA_RULE_POSITION, cpu_to_be64(handle),
3014 goto nla_put_failure;
3017 if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
3018 nft_flow_rule_stats(chain, rule);
3020 list = nla_nest_start_noflag(skb, NFTA_RULE_EXPRESSIONS);
3022 goto nla_put_failure;
3023 nft_rule_for_each_expr(expr, next, rule) {
3024 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
3025 goto nla_put_failure;
3027 nla_nest_end(skb, list);
3030 struct nft_userdata *udata = nft_userdata(rule);
3031 if (nla_put(skb, NFTA_RULE_USERDATA, udata->len + 1,
3033 goto nla_put_failure;
3036 nlmsg_end(skb, nlh);
3040 nlmsg_trim(skb, nlh);
3044 static void nf_tables_rule_notify(const struct nft_ctx *ctx,
3045 const struct nft_rule *rule, int event)
3047 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3048 const struct nft_rule *prule;
3049 struct sk_buff *skb;
3055 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
3058 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
3062 if (event == NFT_MSG_NEWRULE &&
3063 !list_is_first(&rule->list, &ctx->chain->rules) &&
3064 !list_is_last(&rule->list, &ctx->chain->rules)) {
3065 prule = list_prev_entry(rule, list);
3066 handle = prule->handle;
3068 if (ctx->flags & (NLM_F_APPEND | NLM_F_REPLACE))
3069 flags |= NLM_F_APPEND;
3070 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
3071 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
3073 err = nf_tables_fill_rule_info(skb, ctx->net, ctx->portid, ctx->seq,
3074 event, flags, ctx->family, ctx->table,
3075 ctx->chain, rule, handle);
3081 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
3084 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
3087 struct nft_rule_dump_ctx {
3092 static int __nf_tables_dump_rules(struct sk_buff *skb,
3094 struct netlink_callback *cb,
3095 const struct nft_table *table,
3096 const struct nft_chain *chain)
3098 struct net *net = sock_net(skb->sk);
3099 const struct nft_rule *rule, *prule;
3100 unsigned int s_idx = cb->args[0];
3104 list_for_each_entry_rcu(rule, &chain->rules, list) {
3105 if (!nft_is_active(net, rule))
3110 memset(&cb->args[1], 0,
3111 sizeof(cb->args) - sizeof(cb->args[0]));
3114 handle = prule->handle;
3118 if (nf_tables_fill_rule_info(skb, net, NETLINK_CB(cb->skb).portid,
3121 NLM_F_MULTI | NLM_F_APPEND,
3123 table, chain, rule, handle) < 0)
3126 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3135 static int nf_tables_dump_rules(struct sk_buff *skb,
3136 struct netlink_callback *cb)
3138 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3139 const struct nft_rule_dump_ctx *ctx = cb->data;
3140 struct nft_table *table;
3141 const struct nft_chain *chain;
3142 unsigned int idx = 0;
3143 struct net *net = sock_net(skb->sk);
3144 int family = nfmsg->nfgen_family;
3145 struct nftables_pernet *nft_net;
3148 nft_net = nft_pernet(net);
3149 cb->seq = nft_net->base_seq;
3151 list_for_each_entry_rcu(table, &nft_net->tables, list) {
3152 if (family != NFPROTO_UNSPEC && family != table->family)
3155 if (ctx && ctx->table && strcmp(ctx->table, table->name) != 0)
3158 if (ctx && ctx->table && ctx->chain) {
3159 struct rhlist_head *list, *tmp;
3161 list = rhltable_lookup(&table->chains_ht, ctx->chain,
3162 nft_chain_ht_params);
3166 rhl_for_each_entry_rcu(chain, tmp, list, rhlhead) {
3167 if (!nft_is_active(net, chain))
3169 __nf_tables_dump_rules(skb, &idx,
3176 list_for_each_entry_rcu(chain, &table->chains, list) {
3177 if (__nf_tables_dump_rules(skb, &idx, cb, table, chain))
3181 if (ctx && ctx->table)
3191 static int nf_tables_dump_rules_start(struct netlink_callback *cb)
3193 const struct nlattr * const *nla = cb->data;
3194 struct nft_rule_dump_ctx *ctx = NULL;
3196 if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
3197 ctx = kzalloc(sizeof(*ctx), GFP_ATOMIC);
3201 if (nla[NFTA_RULE_TABLE]) {
3202 ctx->table = nla_strdup(nla[NFTA_RULE_TABLE],
3209 if (nla[NFTA_RULE_CHAIN]) {
3210 ctx->chain = nla_strdup(nla[NFTA_RULE_CHAIN],
3224 static int nf_tables_dump_rules_done(struct netlink_callback *cb)
3226 struct nft_rule_dump_ctx *ctx = cb->data;
3236 /* called with rcu_read_lock held */
3237 static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
3238 const struct nlattr * const nla[])
3240 struct netlink_ext_ack *extack = info->extack;
3241 u8 genmask = nft_genmask_cur(info->net);
3242 u8 family = info->nfmsg->nfgen_family;
3243 const struct nft_chain *chain;
3244 const struct nft_rule *rule;
3245 struct net *net = info->net;
3246 struct nft_table *table;
3247 struct sk_buff *skb2;
3250 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
3251 struct netlink_dump_control c = {
3252 .start= nf_tables_dump_rules_start,
3253 .dump = nf_tables_dump_rules,
3254 .done = nf_tables_dump_rules_done,
3255 .module = THIS_MODULE,
3256 .data = (void *)nla,
3259 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
3262 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask, 0);
3263 if (IS_ERR(table)) {
3264 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3265 return PTR_ERR(table);
3268 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN], genmask);
3269 if (IS_ERR(chain)) {
3270 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3271 return PTR_ERR(chain);
3274 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3276 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3277 return PTR_ERR(rule);
3280 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
3284 err = nf_tables_fill_rule_info(skb2, net, NETLINK_CB(skb).portid,
3285 info->nlh->nlmsg_seq, NFT_MSG_NEWRULE, 0,
3286 family, table, chain, rule, 0);
3288 goto err_fill_rule_info;
3290 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
3297 static void nf_tables_rule_destroy(const struct nft_ctx *ctx,
3298 struct nft_rule *rule)
3300 struct nft_expr *expr, *next;
3303 * Careful: some expressions might not be initialized in case this
3304 * is called on error from nf_tables_newrule().
3306 expr = nft_expr_first(rule);
3307 while (nft_expr_more(rule, expr)) {
3308 next = nft_expr_next(expr);
3309 nf_tables_expr_destroy(ctx, expr);
3315 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule)
3317 nft_rule_expr_deactivate(ctx, rule, NFT_TRANS_RELEASE);
3318 nf_tables_rule_destroy(ctx, rule);
3321 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain)
3323 struct nft_expr *expr, *last;
3324 const struct nft_data *data;
3325 struct nft_rule *rule;
3328 if (ctx->level == NFT_JUMP_STACK_SIZE)
3331 list_for_each_entry(rule, &chain->rules, list) {
3332 if (!nft_is_active_next(ctx->net, rule))
3335 nft_rule_for_each_expr(expr, last, rule) {
3336 if (!expr->ops->validate)
3339 err = expr->ops->validate(ctx, expr, &data);
3347 EXPORT_SYMBOL_GPL(nft_chain_validate);
3349 static int nft_table_validate(struct net *net, const struct nft_table *table)
3351 struct nft_chain *chain;
3352 struct nft_ctx ctx = {
3354 .family = table->family,
3358 list_for_each_entry(chain, &table->chains, list) {
3359 if (!nft_is_base_chain(chain))
3363 err = nft_chain_validate(&ctx, chain);
3371 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3372 const struct nlattr *nla);
3374 #define NFT_RULE_MAXEXPRS 128
3376 static int nf_tables_newrule(struct sk_buff *skb, const struct nfnl_info *info,
3377 const struct nlattr * const nla[])
3379 struct nftables_pernet *nft_net = nft_pernet(info->net);
3380 struct netlink_ext_ack *extack = info->extack;
3381 unsigned int size, i, n, ulen = 0, usize = 0;
3382 u8 genmask = nft_genmask_next(info->net);
3383 struct nft_rule *rule, *old_rule = NULL;
3384 struct nft_expr_info *expr_info = NULL;
3385 u8 family = info->nfmsg->nfgen_family;
3386 struct nft_flow_rule *flow = NULL;
3387 struct net *net = info->net;
3388 struct nft_userdata *udata;
3389 struct nft_table *table;
3390 struct nft_chain *chain;
3391 struct nft_trans *trans;
3392 u64 handle, pos_handle;
3393 struct nft_expr *expr;
3398 lockdep_assert_held(&nft_net->commit_mutex);
3400 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3401 NETLINK_CB(skb).portid);
3402 if (IS_ERR(table)) {
3403 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3404 return PTR_ERR(table);
3407 if (nla[NFTA_RULE_CHAIN]) {
3408 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3410 if (IS_ERR(chain)) {
3411 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3412 return PTR_ERR(chain);
3414 if (nft_chain_is_bound(chain))
3417 } else if (nla[NFTA_RULE_CHAIN_ID]) {
3418 chain = nft_chain_lookup_byid(net, nla[NFTA_RULE_CHAIN_ID]);
3419 if (IS_ERR(chain)) {
3420 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN_ID]);
3421 return PTR_ERR(chain);
3427 if (nla[NFTA_RULE_HANDLE]) {
3428 handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_HANDLE]));
3429 rule = __nft_rule_lookup(chain, handle);
3431 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3432 return PTR_ERR(rule);
3435 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
3436 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3439 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
3444 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE) ||
3445 info->nlh->nlmsg_flags & NLM_F_REPLACE)
3447 handle = nf_tables_alloc_handle(table);
3449 if (chain->use == UINT_MAX)
3452 if (nla[NFTA_RULE_POSITION]) {
3453 pos_handle = be64_to_cpu(nla_get_be64(nla[NFTA_RULE_POSITION]));
3454 old_rule = __nft_rule_lookup(chain, pos_handle);
3455 if (IS_ERR(old_rule)) {
3456 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
3457 return PTR_ERR(old_rule);
3459 } else if (nla[NFTA_RULE_POSITION_ID]) {
3460 old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
3461 if (IS_ERR(old_rule)) {
3462 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
3463 return PTR_ERR(old_rule);
3468 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3472 if (nla[NFTA_RULE_EXPRESSIONS]) {
3473 expr_info = kvmalloc_array(NFT_RULE_MAXEXPRS,
3474 sizeof(struct nft_expr_info),
3479 nla_for_each_nested(tmp, nla[NFTA_RULE_EXPRESSIONS], rem) {
3481 if (nla_type(tmp) != NFTA_LIST_ELEM)
3482 goto err_release_expr;
3483 if (n == NFT_RULE_MAXEXPRS)
3484 goto err_release_expr;
3485 err = nf_tables_expr_parse(&ctx, tmp, &expr_info[n]);
3487 NL_SET_BAD_ATTR(extack, tmp);
3488 goto err_release_expr;
3490 size += expr_info[n].ops->size;
3494 /* Check for overflow of dlen field */
3496 if (size >= 1 << 12)
3497 goto err_release_expr;
3499 if (nla[NFTA_RULE_USERDATA]) {
3500 ulen = nla_len(nla[NFTA_RULE_USERDATA]);
3502 usize = sizeof(struct nft_userdata) + ulen;
3506 rule = kzalloc(sizeof(*rule) + size + usize, GFP_KERNEL_ACCOUNT);
3508 goto err_release_expr;
3510 nft_activate_next(net, rule);
3512 rule->handle = handle;
3514 rule->udata = ulen ? 1 : 0;
3517 udata = nft_userdata(rule);
3518 udata->len = ulen - 1;
3519 nla_memcpy(udata->data, nla[NFTA_RULE_USERDATA], ulen);
3522 expr = nft_expr_first(rule);
3523 for (i = 0; i < n; i++) {
3524 err = nf_tables_newexpr(&ctx, &expr_info[i], expr);
3526 NL_SET_BAD_ATTR(extack, expr_info[i].attr);
3527 goto err_release_rule;
3530 if (expr_info[i].ops->validate)
3531 nft_validate_state_update(net, NFT_VALIDATE_NEED);
3533 expr_info[i].ops = NULL;
3534 expr = nft_expr_next(expr);
3537 if (chain->flags & NFT_CHAIN_HW_OFFLOAD) {
3538 flow = nft_flow_rule_create(net, rule);
3540 err = PTR_ERR(flow);
3541 goto err_release_rule;
3545 if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
3546 err = nft_delrule(&ctx, old_rule);
3548 goto err_destroy_flow_rule;
3550 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3551 if (trans == NULL) {
3553 goto err_destroy_flow_rule;
3555 list_add_tail_rcu(&rule->list, &old_rule->list);
3557 trans = nft_trans_rule_add(&ctx, NFT_MSG_NEWRULE, rule);
3560 goto err_destroy_flow_rule;
3563 if (info->nlh->nlmsg_flags & NLM_F_APPEND) {
3565 list_add_rcu(&rule->list, &old_rule->list);
3567 list_add_tail_rcu(&rule->list, &chain->rules);
3570 list_add_tail_rcu(&rule->list, &old_rule->list);
3572 list_add_rcu(&rule->list, &chain->rules);
3579 nft_trans_flow_rule(trans) = flow;
3581 if (nft_net->validate_state == NFT_VALIDATE_DO)
3582 return nft_table_validate(net, table);
3586 err_destroy_flow_rule:
3588 nft_flow_rule_destroy(flow);
3590 nf_tables_rule_release(&ctx, rule);
3592 for (i = 0; i < n; i++) {
3593 if (expr_info[i].ops) {
3594 module_put(expr_info[i].ops->type->owner);
3595 if (expr_info[i].ops->type->release_ops)
3596 expr_info[i].ops->type->release_ops(expr_info[i].ops);
3604 static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
3605 const struct nlattr *nla)
3607 struct nftables_pernet *nft_net = nft_pernet(net);
3608 u32 id = ntohl(nla_get_be32(nla));
3609 struct nft_trans *trans;
3611 list_for_each_entry(trans, &nft_net->commit_list, list) {
3612 struct nft_rule *rule = nft_trans_rule(trans);
3614 if (trans->msg_type == NFT_MSG_NEWRULE &&
3615 id == nft_trans_rule_id(trans))
3618 return ERR_PTR(-ENOENT);
3621 static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
3622 const struct nlattr * const nla[])
3624 struct netlink_ext_ack *extack = info->extack;
3625 u8 genmask = nft_genmask_next(info->net);
3626 u8 family = info->nfmsg->nfgen_family;
3627 struct nft_chain *chain = NULL;
3628 struct net *net = info->net;
3629 struct nft_table *table;
3630 struct nft_rule *rule;
3634 table = nft_table_lookup(net, nla[NFTA_RULE_TABLE], family, genmask,
3635 NETLINK_CB(skb).portid);
3636 if (IS_ERR(table)) {
3637 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_TABLE]);
3638 return PTR_ERR(table);
3641 if (nla[NFTA_RULE_CHAIN]) {
3642 chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
3644 if (IS_ERR(chain)) {
3645 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_CHAIN]);
3646 return PTR_ERR(chain);
3648 if (nft_chain_is_bound(chain))
3652 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
3655 if (nla[NFTA_RULE_HANDLE]) {
3656 rule = nft_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
3658 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_HANDLE]);
3659 return PTR_ERR(rule);
3662 err = nft_delrule(&ctx, rule);
3663 } else if (nla[NFTA_RULE_ID]) {
3664 rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
3666 NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
3667 return PTR_ERR(rule);
3670 err = nft_delrule(&ctx, rule);
3672 err = nft_delrule_by_chain(&ctx);
3675 list_for_each_entry(chain, &table->chains, list) {
3676 if (!nft_is_active_next(net, chain))
3680 err = nft_delrule_by_chain(&ctx);
3692 static const struct nft_set_type *nft_set_types[] = {
3693 &nft_set_hash_fast_type,
3695 &nft_set_rhash_type,
3696 &nft_set_bitmap_type,
3697 &nft_set_rbtree_type,
3698 #if defined(CONFIG_X86_64) && !defined(CONFIG_UML)
3699 &nft_set_pipapo_avx2_type,
3701 &nft_set_pipapo_type,
3704 #define NFT_SET_FEATURES (NFT_SET_INTERVAL | NFT_SET_MAP | \
3705 NFT_SET_TIMEOUT | NFT_SET_OBJECT | \
3708 static bool nft_set_ops_candidate(const struct nft_set_type *type, u32 flags)
3710 return (flags & type->features) == (flags & NFT_SET_FEATURES);
3714 * Select a set implementation based on the data characteristics and the
3715 * given policy. The total memory use might not be known if no size is
3716 * given, in that case the amount of memory per element is used.
3718 static const struct nft_set_ops *
3719 nft_select_set_ops(const struct nft_ctx *ctx,
3720 const struct nlattr * const nla[],
3721 const struct nft_set_desc *desc,
3722 enum nft_set_policies policy)
3724 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
3725 const struct nft_set_ops *ops, *bops;
3726 struct nft_set_estimate est, best;
3727 const struct nft_set_type *type;
3731 lockdep_assert_held(&nft_net->commit_mutex);
3732 lockdep_nfnl_nft_mutex_not_held();
3734 if (nla[NFTA_SET_FLAGS] != NULL)
3735 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
3742 for (i = 0; i < ARRAY_SIZE(nft_set_types); i++) {
3743 type = nft_set_types[i];
3746 if (!nft_set_ops_candidate(type, flags))
3748 if (!ops->estimate(desc, flags, &est))
3752 case NFT_SET_POL_PERFORMANCE:
3753 if (est.lookup < best.lookup)
3755 if (est.lookup == best.lookup &&
3756 est.space < best.space)
3759 case NFT_SET_POL_MEMORY:
3761 if (est.space < best.space)
3763 if (est.space == best.space &&
3764 est.lookup < best.lookup)
3766 } else if (est.size < best.size || !bops) {
3781 return ERR_PTR(-EOPNOTSUPP);
3784 static const struct nla_policy nft_set_policy[NFTA_SET_MAX + 1] = {
3785 [NFTA_SET_TABLE] = { .type = NLA_STRING,
3786 .len = NFT_TABLE_MAXNAMELEN - 1 },
3787 [NFTA_SET_NAME] = { .type = NLA_STRING,
3788 .len = NFT_SET_MAXNAMELEN - 1 },
3789 [NFTA_SET_FLAGS] = { .type = NLA_U32 },
3790 [NFTA_SET_KEY_TYPE] = { .type = NLA_U32 },
3791 [NFTA_SET_KEY_LEN] = { .type = NLA_U32 },
3792 [NFTA_SET_DATA_TYPE] = { .type = NLA_U32 },
3793 [NFTA_SET_DATA_LEN] = { .type = NLA_U32 },
3794 [NFTA_SET_POLICY] = { .type = NLA_U32 },
3795 [NFTA_SET_DESC] = { .type = NLA_NESTED },
3796 [NFTA_SET_ID] = { .type = NLA_U32 },
3797 [NFTA_SET_TIMEOUT] = { .type = NLA_U64 },
3798 [NFTA_SET_GC_INTERVAL] = { .type = NLA_U32 },
3799 [NFTA_SET_USERDATA] = { .type = NLA_BINARY,
3800 .len = NFT_USERDATA_MAXLEN },
3801 [NFTA_SET_OBJ_TYPE] = { .type = NLA_U32 },
3802 [NFTA_SET_HANDLE] = { .type = NLA_U64 },
3803 [NFTA_SET_EXPR] = { .type = NLA_NESTED },
3804 [NFTA_SET_EXPRESSIONS] = { .type = NLA_NESTED },
3807 static const struct nla_policy nft_set_desc_policy[NFTA_SET_DESC_MAX + 1] = {
3808 [NFTA_SET_DESC_SIZE] = { .type = NLA_U32 },
3809 [NFTA_SET_DESC_CONCAT] = { .type = NLA_NESTED },
3812 static struct nft_set *nft_set_lookup(const struct nft_table *table,
3813 const struct nlattr *nla, u8 genmask)
3815 struct nft_set *set;
3818 return ERR_PTR(-EINVAL);
3820 list_for_each_entry_rcu(set, &table->sets, list) {
3821 if (!nla_strcmp(nla, set->name) &&
3822 nft_active_genmask(set, genmask))
3825 return ERR_PTR(-ENOENT);
3828 static struct nft_set *nft_set_lookup_byhandle(const struct nft_table *table,
3829 const struct nlattr *nla,
3832 struct nft_set *set;
3834 list_for_each_entry(set, &table->sets, list) {
3835 if (be64_to_cpu(nla_get_be64(nla)) == set->handle &&
3836 nft_active_genmask(set, genmask))
3839 return ERR_PTR(-ENOENT);
3842 static struct nft_set *nft_set_lookup_byid(const struct net *net,
3843 const struct nlattr *nla, u8 genmask)
3845 struct nftables_pernet *nft_net = nft_pernet(net);
3846 u32 id = ntohl(nla_get_be32(nla));
3847 struct nft_trans *trans;
3849 list_for_each_entry(trans, &nft_net->commit_list, list) {
3850 if (trans->msg_type == NFT_MSG_NEWSET) {
3851 struct nft_set *set = nft_trans_set(trans);
3853 if (id == nft_trans_set_id(trans) &&
3854 nft_active_genmask(set, genmask))
3858 return ERR_PTR(-ENOENT);
3861 struct nft_set *nft_set_lookup_global(const struct net *net,
3862 const struct nft_table *table,
3863 const struct nlattr *nla_set_name,
3864 const struct nlattr *nla_set_id,
3867 struct nft_set *set;
3869 set = nft_set_lookup(table, nla_set_name, genmask);
3874 set = nft_set_lookup_byid(net, nla_set_id, genmask);
3878 EXPORT_SYMBOL_GPL(nft_set_lookup_global);
3880 static int nf_tables_set_alloc_name(struct nft_ctx *ctx, struct nft_set *set,
3883 const struct nft_set *i;
3885 unsigned long *inuse;
3886 unsigned int n = 0, min = 0;
3888 p = strchr(name, '%');
3890 if (p[1] != 'd' || strchr(p + 2, '%'))
3893 inuse = (unsigned long *)get_zeroed_page(GFP_KERNEL);
3897 list_for_each_entry(i, &ctx->table->sets, list) {
3900 if (!nft_is_active_next(ctx->net, set))
3902 if (!sscanf(i->name, name, &tmp))
3904 if (tmp < min || tmp >= min + BITS_PER_BYTE * PAGE_SIZE)
3907 set_bit(tmp - min, inuse);
3910 n = find_first_zero_bit(inuse, BITS_PER_BYTE * PAGE_SIZE);
3911 if (n >= BITS_PER_BYTE * PAGE_SIZE) {
3912 min += BITS_PER_BYTE * PAGE_SIZE;
3913 memset(inuse, 0, PAGE_SIZE);
3916 free_page((unsigned long)inuse);
3919 set->name = kasprintf(GFP_KERNEL_ACCOUNT, name, min + n);
3923 list_for_each_entry(i, &ctx->table->sets, list) {
3924 if (!nft_is_active_next(ctx->net, i))
3926 if (!strcmp(set->name, i->name)) {
3935 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result)
3937 u64 ms = be64_to_cpu(nla_get_be64(nla));
3938 u64 max = (u64)(~((u64)0));
3940 max = div_u64(max, NSEC_PER_MSEC);
3944 ms *= NSEC_PER_MSEC;
3945 *result = nsecs_to_jiffies64(ms);
3949 __be64 nf_jiffies64_to_msecs(u64 input)
3951 return cpu_to_be64(jiffies64_to_msecs(input));
3954 static int nf_tables_fill_set_concat(struct sk_buff *skb,
3955 const struct nft_set *set)
3957 struct nlattr *concat, *field;
3960 concat = nla_nest_start_noflag(skb, NFTA_SET_DESC_CONCAT);
3964 for (i = 0; i < set->field_count; i++) {
3965 field = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
3969 if (nla_put_be32(skb, NFTA_SET_FIELD_LEN,
3970 htonl(set->field_len[i])))
3973 nla_nest_end(skb, field);
3976 nla_nest_end(skb, concat);
3981 static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
3982 const struct nft_set *set, u16 event, u16 flags)
3984 struct nlmsghdr *nlh;
3985 u32 portid = ctx->portid;
3986 struct nlattr *nest;
3990 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
3991 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
3992 NFNETLINK_V0, nft_base_seq(ctx->net));
3994 goto nla_put_failure;
3996 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
3997 goto nla_put_failure;
3998 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
3999 goto nla_put_failure;
4000 if (nla_put_be64(skb, NFTA_SET_HANDLE, cpu_to_be64(set->handle),
4002 goto nla_put_failure;
4003 if (set->flags != 0)
4004 if (nla_put_be32(skb, NFTA_SET_FLAGS, htonl(set->flags)))
4005 goto nla_put_failure;
4007 if (nla_put_be32(skb, NFTA_SET_KEY_TYPE, htonl(set->ktype)))
4008 goto nla_put_failure;
4009 if (nla_put_be32(skb, NFTA_SET_KEY_LEN, htonl(set->klen)))
4010 goto nla_put_failure;
4011 if (set->flags & NFT_SET_MAP) {
4012 if (nla_put_be32(skb, NFTA_SET_DATA_TYPE, htonl(set->dtype)))
4013 goto nla_put_failure;
4014 if (nla_put_be32(skb, NFTA_SET_DATA_LEN, htonl(set->dlen)))
4015 goto nla_put_failure;
4017 if (set->flags & NFT_SET_OBJECT &&
4018 nla_put_be32(skb, NFTA_SET_OBJ_TYPE, htonl(set->objtype)))
4019 goto nla_put_failure;
4022 nla_put_be64(skb, NFTA_SET_TIMEOUT,
4023 nf_jiffies64_to_msecs(set->timeout),
4025 goto nla_put_failure;
4027 nla_put_be32(skb, NFTA_SET_GC_INTERVAL, htonl(set->gc_int)))
4028 goto nla_put_failure;
4030 if (set->policy != NFT_SET_POL_PERFORMANCE) {
4031 if (nla_put_be32(skb, NFTA_SET_POLICY, htonl(set->policy)))
4032 goto nla_put_failure;
4036 nla_put(skb, NFTA_SET_USERDATA, set->udlen, set->udata))
4037 goto nla_put_failure;
4039 nest = nla_nest_start_noflag(skb, NFTA_SET_DESC);
4041 goto nla_put_failure;
4043 nla_put_be32(skb, NFTA_SET_DESC_SIZE, htonl(set->size)))
4044 goto nla_put_failure;
4046 if (set->field_count > 1 &&
4047 nf_tables_fill_set_concat(skb, set))
4048 goto nla_put_failure;
4050 nla_nest_end(skb, nest);
4052 if (set->num_exprs == 1) {
4053 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPR);
4054 if (nf_tables_fill_expr_info(skb, set->exprs[0]) < 0)
4055 goto nla_put_failure;
4057 nla_nest_end(skb, nest);
4058 } else if (set->num_exprs > 1) {
4059 nest = nla_nest_start_noflag(skb, NFTA_SET_EXPRESSIONS);
4061 goto nla_put_failure;
4063 for (i = 0; i < set->num_exprs; i++) {
4064 if (nft_expr_dump(skb, NFTA_LIST_ELEM,
4066 goto nla_put_failure;
4068 nla_nest_end(skb, nest);
4071 nlmsg_end(skb, nlh);
4075 nlmsg_trim(skb, nlh);
4079 static void nf_tables_set_notify(const struct nft_ctx *ctx,
4080 const struct nft_set *set, int event,
4083 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
4084 u32 portid = ctx->portid;
4085 struct sk_buff *skb;
4090 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
4093 skb = nlmsg_new(NLMSG_GOODSIZE, gfp_flags);
4097 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
4098 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
4100 err = nf_tables_fill_set(skb, ctx, set, event, flags);
4106 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
4109 nfnetlink_set_err(ctx->net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
4112 static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
4114 const struct nft_set *set;
4115 unsigned int idx, s_idx = cb->args[0];
4116 struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
4117 struct net *net = sock_net(skb->sk);
4118 struct nft_ctx *ctx = cb->data, ctx_set;
4119 struct nftables_pernet *nft_net;
4125 nft_net = nft_pernet(net);
4126 cb->seq = nft_net->base_seq;
4128 list_for_each_entry_rcu(table, &nft_net->tables, list) {
4129 if (ctx->family != NFPROTO_UNSPEC &&
4130 ctx->family != table->family)
4133 if (ctx->table && ctx->table != table)
4137 if (cur_table != table)
4143 list_for_each_entry_rcu(set, &table->sets, list) {
4146 if (!nft_is_active(net, set))
4150 ctx_set.table = table;
4151 ctx_set.family = table->family;
4153 if (nf_tables_fill_set(skb, &ctx_set, set,
4157 cb->args[2] = (unsigned long) table;
4160 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4173 static int nf_tables_dump_sets_start(struct netlink_callback *cb)
4175 struct nft_ctx *ctx_dump = NULL;
4177 ctx_dump = kmemdup(cb->data, sizeof(*ctx_dump), GFP_ATOMIC);
4178 if (ctx_dump == NULL)
4181 cb->data = ctx_dump;
4185 static int nf_tables_dump_sets_done(struct netlink_callback *cb)
4191 /* called with rcu_read_lock held */
4192 static int nf_tables_getset(struct sk_buff *skb, const struct nfnl_info *info,
4193 const struct nlattr * const nla[])
4195 struct netlink_ext_ack *extack = info->extack;
4196 u8 genmask = nft_genmask_cur(info->net);
4197 u8 family = info->nfmsg->nfgen_family;
4198 struct nft_table *table = NULL;
4199 struct net *net = info->net;
4200 const struct nft_set *set;
4201 struct sk_buff *skb2;
4205 if (nla[NFTA_SET_TABLE]) {
4206 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4208 if (IS_ERR(table)) {
4209 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4210 return PTR_ERR(table);
4214 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4216 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
4217 struct netlink_dump_control c = {
4218 .start = nf_tables_dump_sets_start,
4219 .dump = nf_tables_dump_sets,
4220 .done = nf_tables_dump_sets_done,
4222 .module = THIS_MODULE,
4225 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
4228 /* Only accept unspec with dump */
4229 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4230 return -EAFNOSUPPORT;
4231 if (!nla[NFTA_SET_TABLE])
4234 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4236 return PTR_ERR(set);
4238 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
4242 err = nf_tables_fill_set(skb2, &ctx, set, NFT_MSG_NEWSET, 0);
4244 goto err_fill_set_info;
4246 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
4253 static const struct nla_policy nft_concat_policy[NFTA_SET_FIELD_MAX + 1] = {
4254 [NFTA_SET_FIELD_LEN] = { .type = NLA_U32 },
4257 static int nft_set_desc_concat_parse(const struct nlattr *attr,
4258 struct nft_set_desc *desc)
4260 struct nlattr *tb[NFTA_SET_FIELD_MAX + 1];
4264 if (desc->field_count >= ARRAY_SIZE(desc->field_len))
4267 err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
4268 nft_concat_policy, NULL);
4272 if (!tb[NFTA_SET_FIELD_LEN])
4275 len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
4276 if (!len || len > U8_MAX)
4279 desc->field_len[desc->field_count++] = len;
4284 static int nft_set_desc_concat(struct nft_set_desc *desc,
4285 const struct nlattr *nla)
4287 struct nlattr *attr;
4291 nla_for_each_nested(attr, nla, rem) {
4292 if (nla_type(attr) != NFTA_LIST_ELEM)
4295 err = nft_set_desc_concat_parse(attr, desc);
4300 for (i = 0; i < desc->field_count; i++)
4301 num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
4303 if (num_regs > NFT_REG32_COUNT)
4309 static int nf_tables_set_desc_parse(struct nft_set_desc *desc,
4310 const struct nlattr *nla)
4312 struct nlattr *da[NFTA_SET_DESC_MAX + 1];
4315 err = nla_parse_nested_deprecated(da, NFTA_SET_DESC_MAX, nla,
4316 nft_set_desc_policy, NULL);
4320 if (da[NFTA_SET_DESC_SIZE] != NULL)
4321 desc->size = ntohl(nla_get_be32(da[NFTA_SET_DESC_SIZE]));
4322 if (da[NFTA_SET_DESC_CONCAT])
4323 err = nft_set_desc_concat(desc, da[NFTA_SET_DESC_CONCAT]);
4328 static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
4329 const struct nlattr * const nla[])
4331 u32 ktype, dtype, flags, policy, gc_int, objtype;
4332 struct netlink_ext_ack *extack = info->extack;
4333 u8 genmask = nft_genmask_next(info->net);
4334 u8 family = info->nfmsg->nfgen_family;
4335 const struct nft_set_ops *ops;
4336 struct nft_expr *expr = NULL;
4337 struct net *net = info->net;
4338 struct nft_set_desc desc;
4339 struct nft_table *table;
4340 unsigned char *udata;
4341 struct nft_set *set;
4350 if (nla[NFTA_SET_TABLE] == NULL ||
4351 nla[NFTA_SET_NAME] == NULL ||
4352 nla[NFTA_SET_KEY_LEN] == NULL ||
4353 nla[NFTA_SET_ID] == NULL)
4356 memset(&desc, 0, sizeof(desc));
4358 ktype = NFT_DATA_VALUE;
4359 if (nla[NFTA_SET_KEY_TYPE] != NULL) {
4360 ktype = ntohl(nla_get_be32(nla[NFTA_SET_KEY_TYPE]));
4361 if ((ktype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK)
4365 desc.klen = ntohl(nla_get_be32(nla[NFTA_SET_KEY_LEN]));
4366 if (desc.klen == 0 || desc.klen > NFT_DATA_VALUE_MAXLEN)
4370 if (nla[NFTA_SET_FLAGS] != NULL) {
4371 flags = ntohl(nla_get_be32(nla[NFTA_SET_FLAGS]));
4372 if (flags & ~(NFT_SET_ANONYMOUS | NFT_SET_CONSTANT |
4373 NFT_SET_INTERVAL | NFT_SET_TIMEOUT |
4374 NFT_SET_MAP | NFT_SET_EVAL |
4375 NFT_SET_OBJECT | NFT_SET_CONCAT | NFT_SET_EXPR))
4377 /* Only one of these operations is supported */
4378 if ((flags & (NFT_SET_MAP | NFT_SET_OBJECT)) ==
4379 (NFT_SET_MAP | NFT_SET_OBJECT))
4381 if ((flags & (NFT_SET_EVAL | NFT_SET_OBJECT)) ==
4382 (NFT_SET_EVAL | NFT_SET_OBJECT))
4387 if (nla[NFTA_SET_DATA_TYPE] != NULL) {
4388 if (!(flags & NFT_SET_MAP))
4391 dtype = ntohl(nla_get_be32(nla[NFTA_SET_DATA_TYPE]));
4392 if ((dtype & NFT_DATA_RESERVED_MASK) == NFT_DATA_RESERVED_MASK &&
4393 dtype != NFT_DATA_VERDICT)
4396 if (dtype != NFT_DATA_VERDICT) {
4397 if (nla[NFTA_SET_DATA_LEN] == NULL)
4399 desc.dlen = ntohl(nla_get_be32(nla[NFTA_SET_DATA_LEN]));
4400 if (desc.dlen == 0 || desc.dlen > NFT_DATA_VALUE_MAXLEN)
4403 desc.dlen = sizeof(struct nft_verdict);
4404 } else if (flags & NFT_SET_MAP)
4407 if (nla[NFTA_SET_OBJ_TYPE] != NULL) {
4408 if (!(flags & NFT_SET_OBJECT))
4411 objtype = ntohl(nla_get_be32(nla[NFTA_SET_OBJ_TYPE]));
4412 if (objtype == NFT_OBJECT_UNSPEC ||
4413 objtype > NFT_OBJECT_MAX)
4415 } else if (flags & NFT_SET_OBJECT)
4418 objtype = NFT_OBJECT_UNSPEC;
4421 if (nla[NFTA_SET_TIMEOUT] != NULL) {
4422 if (!(flags & NFT_SET_TIMEOUT))
4425 err = nf_msecs_to_jiffies64(nla[NFTA_SET_TIMEOUT], &timeout);
4430 if (nla[NFTA_SET_GC_INTERVAL] != NULL) {
4431 if (!(flags & NFT_SET_TIMEOUT))
4433 gc_int = ntohl(nla_get_be32(nla[NFTA_SET_GC_INTERVAL]));
4436 policy = NFT_SET_POL_PERFORMANCE;
4437 if (nla[NFTA_SET_POLICY] != NULL)
4438 policy = ntohl(nla_get_be32(nla[NFTA_SET_POLICY]));
4440 if (nla[NFTA_SET_DESC] != NULL) {
4441 err = nf_tables_set_desc_parse(&desc, nla[NFTA_SET_DESC]);
4446 if (nla[NFTA_SET_EXPR] || nla[NFTA_SET_EXPRESSIONS])
4449 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family, genmask,
4450 NETLINK_CB(skb).portid);
4451 if (IS_ERR(table)) {
4452 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4453 return PTR_ERR(table);
4456 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4458 set = nft_set_lookup(table, nla[NFTA_SET_NAME], genmask);
4460 if (PTR_ERR(set) != -ENOENT) {
4461 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4462 return PTR_ERR(set);
4465 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
4466 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]);
4469 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
4475 if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
4478 ops = nft_select_set_ops(&ctx, nla, &desc, policy);
4480 return PTR_ERR(ops);
4483 if (nla[NFTA_SET_USERDATA])
4484 udlen = nla_len(nla[NFTA_SET_USERDATA]);
4487 if (ops->privsize != NULL)
4488 size = ops->privsize(nla, &desc);
4489 alloc_size = sizeof(*set) + size + udlen;
4490 if (alloc_size < size || alloc_size > INT_MAX)
4492 set = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT);
4496 name = nla_strdup(nla[NFTA_SET_NAME], GFP_KERNEL_ACCOUNT);
4502 err = nf_tables_set_alloc_name(&ctx, set, name);
4509 udata = set->data + size;
4510 nla_memcpy(udata, nla[NFTA_SET_USERDATA], udlen);
4513 INIT_LIST_HEAD(&set->bindings);
4514 INIT_LIST_HEAD(&set->catchall_list);
4516 write_pnet(&set->net, net);
4519 set->klen = desc.klen;
4521 set->objtype = objtype;
4522 set->dlen = desc.dlen;
4524 set->size = desc.size;
4525 set->policy = policy;
4528 set->timeout = timeout;
4529 set->gc_int = gc_int;
4531 set->field_count = desc.field_count;
4532 for (i = 0; i < desc.field_count; i++)
4533 set->field_len[i] = desc.field_len[i];
4535 err = ops->init(set, &desc, nla);
4539 if (nla[NFTA_SET_EXPR]) {
4540 expr = nft_set_elem_expr_alloc(&ctx, set, nla[NFTA_SET_EXPR]);
4542 err = PTR_ERR(expr);
4543 goto err_set_expr_alloc;
4545 set->exprs[0] = expr;
4547 } else if (nla[NFTA_SET_EXPRESSIONS]) {
4548 struct nft_expr *expr;
4552 if (!(flags & NFT_SET_EXPR)) {
4554 goto err_set_expr_alloc;
4557 nla_for_each_nested(tmp, nla[NFTA_SET_EXPRESSIONS], left) {
4558 if (i == NFT_SET_EXPR_MAX) {
4560 goto err_set_expr_alloc;
4562 if (nla_type(tmp) != NFTA_LIST_ELEM) {
4564 goto err_set_expr_alloc;
4566 expr = nft_set_elem_expr_alloc(&ctx, set, tmp);
4568 err = PTR_ERR(expr);
4569 goto err_set_expr_alloc;
4571 set->exprs[i++] = expr;
4576 set->handle = nf_tables_alloc_handle(table);
4578 err = nft_trans_set_add(&ctx, NFT_MSG_NEWSET, set);
4580 goto err_set_expr_alloc;
4582 list_add_tail_rcu(&set->list, &table->sets);
4587 for (i = 0; i < set->num_exprs; i++)
4588 nft_expr_destroy(&ctx, set->exprs[i]);
4598 struct nft_set_elem_catchall {
4599 struct list_head list;
4600 struct rcu_head rcu;
4604 static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
4605 struct nft_set *set)
4607 struct nft_set_elem_catchall *next, *catchall;
4609 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
4610 list_del_rcu(&catchall->list);
4611 nft_set_elem_destroy(set, catchall->elem, true);
4612 kfree_rcu(catchall, rcu);
4616 static void nft_set_destroy(const struct nft_ctx *ctx, struct nft_set *set)
4620 if (WARN_ON(set->use > 0))
4623 for (i = 0; i < set->num_exprs; i++)
4624 nft_expr_destroy(ctx, set->exprs[i]);
4626 set->ops->destroy(set);
4627 nft_set_catchall_destroy(ctx, set);
4632 static int nf_tables_delset(struct sk_buff *skb, const struct nfnl_info *info,
4633 const struct nlattr * const nla[])
4635 struct netlink_ext_ack *extack = info->extack;
4636 u8 genmask = nft_genmask_next(info->net);
4637 u8 family = info->nfmsg->nfgen_family;
4638 struct net *net = info->net;
4639 const struct nlattr *attr;
4640 struct nft_table *table;
4641 struct nft_set *set;
4644 if (info->nfmsg->nfgen_family == NFPROTO_UNSPEC)
4645 return -EAFNOSUPPORT;
4647 table = nft_table_lookup(net, nla[NFTA_SET_TABLE], family,
4648 genmask, NETLINK_CB(skb).portid);
4649 if (IS_ERR(table)) {
4650 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_TABLE]);
4651 return PTR_ERR(table);
4654 if (nla[NFTA_SET_HANDLE]) {
4655 attr = nla[NFTA_SET_HANDLE];
4656 set = nft_set_lookup_byhandle(table, attr, genmask);
4658 attr = nla[NFTA_SET_NAME];
4659 set = nft_set_lookup(table, attr, genmask);
4663 NL_SET_BAD_ATTR(extack, attr);
4664 return PTR_ERR(set);
4667 (info->nlh->nlmsg_flags & NLM_F_NONREC &&
4668 atomic_read(&set->nelems) > 0)) {
4669 NL_SET_BAD_ATTR(extack, attr);
4673 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
4675 return nft_delset(&ctx, set);
4678 static int nft_validate_register_store(const struct nft_ctx *ctx,
4679 enum nft_registers reg,
4680 const struct nft_data *data,
4681 enum nft_data_types type,
4684 static int nft_setelem_data_validate(const struct nft_ctx *ctx,
4685 struct nft_set *set,
4686 struct nft_set_elem *elem)
4688 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4689 enum nft_registers dreg;
4691 dreg = nft_type_to_reg(set->dtype);
4692 return nft_validate_register_store(ctx, dreg, nft_set_ext_data(ext),
4693 set->dtype == NFT_DATA_VERDICT ?
4694 NFT_DATA_VERDICT : NFT_DATA_VALUE,
4698 static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx,
4699 struct nft_set *set,
4700 const struct nft_set_iter *iter,
4701 struct nft_set_elem *elem)
4703 return nft_setelem_data_validate(ctx, set, elem);
4706 static int nft_set_catchall_bind_check(const struct nft_ctx *ctx,
4707 struct nft_set *set)
4709 u8 genmask = nft_genmask_next(ctx->net);
4710 struct nft_set_elem_catchall *catchall;
4711 struct nft_set_elem elem;
4712 struct nft_set_ext *ext;
4715 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
4716 ext = nft_set_elem_ext(set, catchall->elem);
4717 if (!nft_set_elem_active(ext, genmask))
4720 elem.priv = catchall->elem;
4721 ret = nft_setelem_data_validate(ctx, set, &elem);
4729 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
4730 struct nft_set_binding *binding)
4732 struct nft_set_binding *i;
4733 struct nft_set_iter iter;
4735 if (set->use == UINT_MAX)
4738 if (!list_empty(&set->bindings) && nft_set_is_anonymous(set))
4741 if (binding->flags & NFT_SET_MAP) {
4742 /* If the set is already bound to the same chain all
4743 * jumps are already validated for that chain.
4745 list_for_each_entry(i, &set->bindings, list) {
4746 if (i->flags & NFT_SET_MAP &&
4747 i->chain == binding->chain)
4751 iter.genmask = nft_genmask_next(ctx->net);
4755 iter.fn = nf_tables_bind_check_setelem;
4757 set->ops->walk(ctx, set, &iter);
4759 iter.err = nft_set_catchall_bind_check(ctx, set);
4765 binding->chain = ctx->chain;
4766 list_add_tail_rcu(&binding->list, &set->bindings);
4767 nft_set_trans_bind(ctx, set);
4772 EXPORT_SYMBOL_GPL(nf_tables_bind_set);
4774 static void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
4775 struct nft_set_binding *binding, bool event)
4777 list_del_rcu(&binding->list);
4779 if (list_empty(&set->bindings) && nft_set_is_anonymous(set)) {
4780 list_del_rcu(&set->list);
4782 nf_tables_set_notify(ctx, set, NFT_MSG_DELSET,
4787 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
4788 struct nft_set_binding *binding,
4789 enum nft_trans_phase phase)
4792 case NFT_TRANS_PREPARE:
4795 case NFT_TRANS_ABORT:
4796 case NFT_TRANS_RELEASE:
4800 nf_tables_unbind_set(ctx, set, binding,
4801 phase == NFT_TRANS_COMMIT);
4804 EXPORT_SYMBOL_GPL(nf_tables_deactivate_set);
4806 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set)
4808 if (list_empty(&set->bindings) && nft_set_is_anonymous(set))
4809 nft_set_destroy(ctx, set);
4811 EXPORT_SYMBOL_GPL(nf_tables_destroy_set);
4813 const struct nft_set_ext_type nft_set_ext_types[] = {
4814 [NFT_SET_EXT_KEY] = {
4815 .align = __alignof__(u32),
4817 [NFT_SET_EXT_DATA] = {
4818 .align = __alignof__(u32),
4820 [NFT_SET_EXT_EXPRESSIONS] = {
4821 .align = __alignof__(struct nft_set_elem_expr),
4823 [NFT_SET_EXT_OBJREF] = {
4824 .len = sizeof(struct nft_object *),
4825 .align = __alignof__(struct nft_object *),
4827 [NFT_SET_EXT_FLAGS] = {
4829 .align = __alignof__(u8),
4831 [NFT_SET_EXT_TIMEOUT] = {
4833 .align = __alignof__(u64),
4835 [NFT_SET_EXT_EXPIRATION] = {
4837 .align = __alignof__(u64),
4839 [NFT_SET_EXT_USERDATA] = {
4840 .len = sizeof(struct nft_userdata),
4841 .align = __alignof__(struct nft_userdata),
4843 [NFT_SET_EXT_KEY_END] = {
4844 .align = __alignof__(u32),
4852 static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
4853 [NFTA_SET_ELEM_KEY] = { .type = NLA_NESTED },
4854 [NFTA_SET_ELEM_DATA] = { .type = NLA_NESTED },
4855 [NFTA_SET_ELEM_FLAGS] = { .type = NLA_U32 },
4856 [NFTA_SET_ELEM_TIMEOUT] = { .type = NLA_U64 },
4857 [NFTA_SET_ELEM_EXPIRATION] = { .type = NLA_U64 },
4858 [NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
4859 .len = NFT_USERDATA_MAXLEN },
4860 [NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
4861 [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
4862 .len = NFT_OBJ_MAXNAMELEN - 1 },
4863 [NFTA_SET_ELEM_KEY_END] = { .type = NLA_NESTED },
4864 [NFTA_SET_ELEM_EXPRESSIONS] = { .type = NLA_NESTED },
4867 static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
4868 [NFTA_SET_ELEM_LIST_TABLE] = { .type = NLA_STRING,
4869 .len = NFT_TABLE_MAXNAMELEN - 1 },
4870 [NFTA_SET_ELEM_LIST_SET] = { .type = NLA_STRING,
4871 .len = NFT_SET_MAXNAMELEN - 1 },
4872 [NFTA_SET_ELEM_LIST_ELEMENTS] = { .type = NLA_NESTED },
4873 [NFTA_SET_ELEM_LIST_SET_ID] = { .type = NLA_U32 },
4876 static int nft_set_elem_expr_dump(struct sk_buff *skb,
4877 const struct nft_set *set,
4878 const struct nft_set_ext *ext)
4880 struct nft_set_elem_expr *elem_expr;
4881 u32 size, num_exprs = 0;
4882 struct nft_expr *expr;
4883 struct nlattr *nest;
4885 elem_expr = nft_set_ext_expr(ext);
4886 nft_setelem_expr_foreach(expr, elem_expr, size)
4889 if (num_exprs == 1) {
4890 expr = nft_setelem_expr_at(elem_expr, 0);
4891 if (nft_expr_dump(skb, NFTA_SET_ELEM_EXPR, expr) < 0)
4895 } else if (num_exprs > 1) {
4896 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_EXPRESSIONS);
4898 goto nla_put_failure;
4900 nft_setelem_expr_foreach(expr, elem_expr, size) {
4901 expr = nft_setelem_expr_at(elem_expr, size);
4902 if (nft_expr_dump(skb, NFTA_LIST_ELEM, expr) < 0)
4903 goto nla_put_failure;
4905 nla_nest_end(skb, nest);
4913 static int nf_tables_fill_setelem(struct sk_buff *skb,
4914 const struct nft_set *set,
4915 const struct nft_set_elem *elem)
4917 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
4918 unsigned char *b = skb_tail_pointer(skb);
4919 struct nlattr *nest;
4921 nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM);
4923 goto nla_put_failure;
4925 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY) &&
4926 nft_data_dump(skb, NFTA_SET_ELEM_KEY, nft_set_ext_key(ext),
4927 NFT_DATA_VALUE, set->klen) < 0)
4928 goto nla_put_failure;
4930 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END) &&
4931 nft_data_dump(skb, NFTA_SET_ELEM_KEY_END, nft_set_ext_key_end(ext),
4932 NFT_DATA_VALUE, set->klen) < 0)
4933 goto nla_put_failure;
4935 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
4936 nft_data_dump(skb, NFTA_SET_ELEM_DATA, nft_set_ext_data(ext),
4937 set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE,
4939 goto nla_put_failure;
4941 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS) &&
4942 nft_set_elem_expr_dump(skb, set, ext))
4943 goto nla_put_failure;
4945 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
4946 nla_put_string(skb, NFTA_SET_ELEM_OBJREF,
4947 (*nft_set_ext_obj(ext))->key.name) < 0)
4948 goto nla_put_failure;
4950 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
4951 nla_put_be32(skb, NFTA_SET_ELEM_FLAGS,
4952 htonl(*nft_set_ext_flags(ext))))
4953 goto nla_put_failure;
4955 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) &&
4956 nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT,
4957 nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)),
4959 goto nla_put_failure;
4961 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
4962 u64 expires, now = get_jiffies_64();
4964 expires = *nft_set_ext_expiration(ext);
4965 if (time_before64(now, expires))
4970 if (nla_put_be64(skb, NFTA_SET_ELEM_EXPIRATION,
4971 nf_jiffies64_to_msecs(expires),
4973 goto nla_put_failure;
4976 if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) {
4977 struct nft_userdata *udata;
4979 udata = nft_set_ext_userdata(ext);
4980 if (nla_put(skb, NFTA_SET_ELEM_USERDATA,
4981 udata->len + 1, udata->data))
4982 goto nla_put_failure;
4985 nla_nest_end(skb, nest);
4993 struct nft_set_dump_args {
4994 const struct netlink_callback *cb;
4995 struct nft_set_iter iter;
4996 struct sk_buff *skb;
4999 static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
5000 struct nft_set *set,
5001 const struct nft_set_iter *iter,
5002 struct nft_set_elem *elem)
5004 struct nft_set_dump_args *args;
5006 args = container_of(iter, struct nft_set_dump_args, iter);
5007 return nf_tables_fill_setelem(args->skb, set, elem);
5010 struct nft_set_dump_ctx {
5011 const struct nft_set *set;
5015 static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
5016 const struct nft_set *set)
5018 struct nft_set_elem_catchall *catchall;
5019 u8 genmask = nft_genmask_cur(net);
5020 struct nft_set_elem elem;
5021 struct nft_set_ext *ext;
5024 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5025 ext = nft_set_elem_ext(set, catchall->elem);
5026 if (!nft_set_elem_active(ext, genmask) ||
5027 nft_set_elem_expired(ext))
5030 elem.priv = catchall->elem;
5031 ret = nf_tables_fill_setelem(skb, set, &elem);
5038 static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
5040 struct nft_set_dump_ctx *dump_ctx = cb->data;
5041 struct net *net = sock_net(skb->sk);
5042 struct nftables_pernet *nft_net;
5043 struct nft_table *table;
5044 struct nft_set *set;
5045 struct nft_set_dump_args args;
5046 bool set_found = false;
5047 struct nlmsghdr *nlh;
5048 struct nlattr *nest;
5053 nft_net = nft_pernet(net);
5054 list_for_each_entry_rcu(table, &nft_net->tables, list) {
5055 if (dump_ctx->ctx.family != NFPROTO_UNSPEC &&
5056 dump_ctx->ctx.family != table->family)
5059 if (table != dump_ctx->ctx.table)
5062 list_for_each_entry_rcu(set, &table->sets, list) {
5063 if (set == dump_ctx->set) {
5076 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWSETELEM);
5077 portid = NETLINK_CB(cb->skb).portid;
5078 seq = cb->nlh->nlmsg_seq;
5080 nlh = nfnl_msg_put(skb, portid, seq, event, NLM_F_MULTI,
5081 table->family, NFNETLINK_V0, nft_base_seq(net));
5083 goto nla_put_failure;
5085 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
5086 goto nla_put_failure;
5087 if (nla_put_string(skb, NFTA_SET_ELEM_LIST_SET, set->name))
5088 goto nla_put_failure;
5090 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5092 goto nla_put_failure;
5096 args.iter.genmask = nft_genmask_cur(net);
5097 args.iter.skip = cb->args[0];
5098 args.iter.count = 0;
5100 args.iter.fn = nf_tables_dump_setelem;
5101 set->ops->walk(&dump_ctx->ctx, set, &args.iter);
5103 if (!args.iter.err && args.iter.count == cb->args[0])
5104 args.iter.err = nft_set_catchall_dump(net, skb, set);
5107 nla_nest_end(skb, nest);
5108 nlmsg_end(skb, nlh);
5110 if (args.iter.err && args.iter.err != -EMSGSIZE)
5111 return args.iter.err;
5112 if (args.iter.count == cb->args[0])
5115 cb->args[0] = args.iter.count;
5123 static int nf_tables_dump_set_start(struct netlink_callback *cb)
5125 struct nft_set_dump_ctx *dump_ctx = cb->data;
5127 cb->data = kmemdup(dump_ctx, sizeof(*dump_ctx), GFP_ATOMIC);
5129 return cb->data ? 0 : -ENOMEM;
5132 static int nf_tables_dump_set_done(struct netlink_callback *cb)
5138 static int nf_tables_fill_setelem_info(struct sk_buff *skb,
5139 const struct nft_ctx *ctx, u32 seq,
5140 u32 portid, int event, u16 flags,
5141 const struct nft_set *set,
5142 const struct nft_set_elem *elem)
5144 struct nlmsghdr *nlh;
5145 struct nlattr *nest;
5148 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
5149 nlh = nfnl_msg_put(skb, portid, seq, event, flags, ctx->family,
5150 NFNETLINK_V0, nft_base_seq(ctx->net));
5152 goto nla_put_failure;
5154 if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
5155 goto nla_put_failure;
5156 if (nla_put_string(skb, NFTA_SET_NAME, set->name))
5157 goto nla_put_failure;
5159 nest = nla_nest_start_noflag(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
5161 goto nla_put_failure;
5163 err = nf_tables_fill_setelem(skb, set, elem);
5165 goto nla_put_failure;
5167 nla_nest_end(skb, nest);
5169 nlmsg_end(skb, nlh);
5173 nlmsg_trim(skb, nlh);
5177 static int nft_setelem_parse_flags(const struct nft_set *set,
5178 const struct nlattr *attr, u32 *flags)
5183 *flags = ntohl(nla_get_be32(attr));
5184 if (*flags & ~(NFT_SET_ELEM_INTERVAL_END | NFT_SET_ELEM_CATCHALL))
5186 if (!(set->flags & NFT_SET_INTERVAL) &&
5187 *flags & NFT_SET_ELEM_INTERVAL_END)
5193 static int nft_setelem_parse_key(struct nft_ctx *ctx, struct nft_set *set,
5194 struct nft_data *key, struct nlattr *attr)
5196 struct nft_data_desc desc;
5199 err = nft_data_init(ctx, key, NFT_DATA_VALUE_MAXLEN, &desc, attr);
5203 if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
5204 nft_data_release(key, desc.type);
5211 static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
5212 struct nft_data_desc *desc,
5213 struct nft_data *data,
5214 struct nlattr *attr)
5219 err = nft_data_init(ctx, data, NFT_DATA_VALUE_MAXLEN, desc, attr);
5223 if (set->dtype == NFT_DATA_VERDICT)
5224 dtype = NFT_DATA_VERDICT;
5226 dtype = NFT_DATA_VALUE;
5228 if (dtype != desc->type ||
5229 set->dlen != desc->len) {
5230 nft_data_release(data, desc->type);
5237 static void *nft_setelem_catchall_get(const struct net *net,
5238 const struct nft_set *set)
5240 struct nft_set_elem_catchall *catchall;
5241 u8 genmask = nft_genmask_cur(net);
5242 struct nft_set_ext *ext;
5245 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5246 ext = nft_set_elem_ext(set, catchall->elem);
5247 if (!nft_set_elem_active(ext, genmask) ||
5248 nft_set_elem_expired(ext))
5251 priv = catchall->elem;
5258 static int nft_setelem_get(struct nft_ctx *ctx, struct nft_set *set,
5259 struct nft_set_elem *elem, u32 flags)
5263 if (!(flags & NFT_SET_ELEM_CATCHALL)) {
5264 priv = set->ops->get(ctx->net, set, elem, flags);
5266 return PTR_ERR(priv);
5268 priv = nft_setelem_catchall_get(ctx->net, set);
5277 static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5278 const struct nlattr *attr)
5280 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5281 struct nft_set_elem elem;
5282 struct sk_buff *skb;
5286 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5287 nft_set_elem_policy, NULL);
5291 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5295 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5298 if (nla[NFTA_SET_ELEM_KEY]) {
5299 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5300 nla[NFTA_SET_ELEM_KEY]);
5305 if (nla[NFTA_SET_ELEM_KEY_END]) {
5306 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5307 nla[NFTA_SET_ELEM_KEY_END]);
5312 err = nft_setelem_get(ctx, set, &elem, flags);
5317 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
5321 err = nf_tables_fill_setelem_info(skb, ctx, ctx->seq, ctx->portid,
5322 NFT_MSG_NEWSETELEM, 0, set, &elem);
5324 goto err_fill_setelem;
5326 return nfnetlink_unicast(skb, ctx->net, ctx->portid);
5333 /* called with rcu_read_lock held */
5334 static int nf_tables_getsetelem(struct sk_buff *skb,
5335 const struct nfnl_info *info,
5336 const struct nlattr * const nla[])
5338 struct netlink_ext_ack *extack = info->extack;
5339 u8 genmask = nft_genmask_cur(info->net);
5340 u8 family = info->nfmsg->nfgen_family;
5341 struct net *net = info->net;
5342 struct nft_table *table;
5343 struct nft_set *set;
5344 struct nlattr *attr;
5348 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
5349 genmask, NETLINK_CB(skb).portid);
5350 if (IS_ERR(table)) {
5351 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
5352 return PTR_ERR(table);
5355 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
5357 return PTR_ERR(set);
5359 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
5361 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
5362 struct netlink_dump_control c = {
5363 .start = nf_tables_dump_set_start,
5364 .dump = nf_tables_dump_set,
5365 .done = nf_tables_dump_set_done,
5366 .module = THIS_MODULE,
5368 struct nft_set_dump_ctx dump_ctx = {
5374 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
5377 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
5380 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
5381 err = nft_get_set_elem(&ctx, set, attr);
5383 NL_SET_BAD_ATTR(extack, attr);
5391 static void nf_tables_setelem_notify(const struct nft_ctx *ctx,
5392 const struct nft_set *set,
5393 const struct nft_set_elem *elem,
5396 struct nftables_pernet *nft_net;
5397 struct net *net = ctx->net;
5398 u32 portid = ctx->portid;
5399 struct sk_buff *skb;
5403 if (!ctx->report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
5406 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
5410 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
5411 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
5413 err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
5420 nft_net = nft_pernet(net);
5421 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
5424 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
5427 static struct nft_trans *nft_trans_elem_alloc(struct nft_ctx *ctx,
5429 struct nft_set *set)
5431 struct nft_trans *trans;
5433 trans = nft_trans_alloc(ctx, msg_type, sizeof(struct nft_trans_elem));
5437 nft_trans_elem_set(trans) = set;
5441 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
5442 const struct nft_set *set,
5443 const struct nlattr *attr)
5445 struct nft_expr *expr;
5448 expr = nft_expr_init(ctx, attr);
5453 if (expr->ops->type->flags & NFT_EXPR_GC) {
5454 if (set->flags & NFT_SET_TIMEOUT)
5455 goto err_set_elem_expr;
5456 if (!set->ops->gc_init)
5457 goto err_set_elem_expr;
5458 set->ops->gc_init(set);
5464 nft_expr_destroy(ctx, expr);
5465 return ERR_PTR(err);
5468 void *nft_set_elem_init(const struct nft_set *set,
5469 const struct nft_set_ext_tmpl *tmpl,
5470 const u32 *key, const u32 *key_end,
5471 const u32 *data, u64 timeout, u64 expiration, gfp_t gfp)
5473 struct nft_set_ext *ext;
5476 elem = kzalloc(set->ops->elemsize + tmpl->len, gfp);
5480 ext = nft_set_elem_ext(set, elem);
5481 nft_set_ext_init(ext, tmpl);
5483 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY))
5484 memcpy(nft_set_ext_key(ext), key, set->klen);
5485 if (nft_set_ext_exists(ext, NFT_SET_EXT_KEY_END))
5486 memcpy(nft_set_ext_key_end(ext), key_end, set->klen);
5487 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5488 memcpy(nft_set_ext_data(ext), data, set->dlen);
5489 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) {
5490 *nft_set_ext_expiration(ext) = get_jiffies_64() + expiration;
5491 if (expiration == 0)
5492 *nft_set_ext_expiration(ext) += timeout;
5494 if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT))
5495 *nft_set_ext_timeout(ext) = timeout;
5500 static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5501 struct nft_expr *expr)
5503 if (expr->ops->destroy_clone) {
5504 expr->ops->destroy_clone(ctx, expr);
5505 module_put(expr->ops->type->owner);
5507 nf_tables_expr_destroy(ctx, expr);
5511 static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
5512 struct nft_set_elem_expr *elem_expr)
5514 struct nft_expr *expr;
5517 nft_setelem_expr_foreach(expr, elem_expr, size)
5518 __nft_set_elem_expr_destroy(ctx, expr);
5521 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
5524 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5525 struct nft_ctx ctx = {
5526 .net = read_pnet(&set->net),
5527 .family = set->table->family,
5530 nft_data_release(nft_set_ext_key(ext), NFT_DATA_VALUE);
5531 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
5532 nft_data_release(nft_set_ext_data(ext), set->dtype);
5533 if (destroy_expr && nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5534 nft_set_elem_expr_destroy(&ctx, nft_set_ext_expr(ext));
5536 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
5537 (*nft_set_ext_obj(ext))->use--;
5540 EXPORT_SYMBOL_GPL(nft_set_elem_destroy);
5542 /* Only called from commit path, nft_setelem_data_deactivate() already deals
5543 * with the refcounting from the preparation phase.
5545 static void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
5546 const struct nft_set *set, void *elem)
5548 struct nft_set_ext *ext = nft_set_elem_ext(set, elem);
5550 if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS))
5551 nft_set_elem_expr_destroy(ctx, nft_set_ext_expr(ext));
5556 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
5557 struct nft_expr *expr_array[])
5559 struct nft_expr *expr;
5562 for (i = 0; i < set->num_exprs; i++) {
5563 expr = kzalloc(set->exprs[i]->ops->size, GFP_KERNEL_ACCOUNT);
5567 err = nft_expr_clone(expr, set->exprs[i]);
5569 nft_expr_destroy(ctx, expr);
5572 expr_array[i] = expr;
5578 for (k = i - 1; k >= 0; k--)
5579 nft_expr_destroy(ctx, expr_array[k]);
5584 static int nft_set_elem_expr_setup(struct nft_ctx *ctx,
5585 const struct nft_set_ext *ext,
5586 struct nft_expr *expr_array[],
5589 struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext);
5590 struct nft_expr *expr;
5593 for (i = 0; i < num_exprs; i++) {
5594 expr = nft_setelem_expr_at(elem_expr, elem_expr->size);
5595 err = nft_expr_clone(expr, expr_array[i]);
5597 goto err_elem_expr_setup;
5599 elem_expr->size += expr_array[i]->ops->size;
5600 nft_expr_destroy(ctx, expr_array[i]);
5601 expr_array[i] = NULL;
5606 err_elem_expr_setup:
5607 for (; i < num_exprs; i++) {
5608 nft_expr_destroy(ctx, expr_array[i]);
5609 expr_array[i] = NULL;
5615 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
5616 const struct nft_set *set)
5618 struct nft_set_elem_catchall *catchall;
5619 u8 genmask = nft_genmask_cur(net);
5620 struct nft_set_ext *ext;
5622 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
5623 ext = nft_set_elem_ext(set, catchall->elem);
5624 if (nft_set_elem_active(ext, genmask) &&
5625 !nft_set_elem_expired(ext))
5631 EXPORT_SYMBOL_GPL(nft_set_catchall_lookup);
5633 void *nft_set_catchall_gc(const struct nft_set *set)
5635 struct nft_set_elem_catchall *catchall, *next;
5636 struct nft_set_ext *ext;
5639 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5640 ext = nft_set_elem_ext(set, catchall->elem);
5642 if (!nft_set_elem_expired(ext) ||
5643 nft_set_elem_mark_busy(ext))
5646 elem = catchall->elem;
5647 list_del_rcu(&catchall->list);
5648 kfree_rcu(catchall, rcu);
5654 EXPORT_SYMBOL_GPL(nft_set_catchall_gc);
5656 static int nft_setelem_catchall_insert(const struct net *net,
5657 struct nft_set *set,
5658 const struct nft_set_elem *elem,
5659 struct nft_set_ext **pext)
5661 struct nft_set_elem_catchall *catchall;
5662 u8 genmask = nft_genmask_next(net);
5663 struct nft_set_ext *ext;
5665 list_for_each_entry(catchall, &set->catchall_list, list) {
5666 ext = nft_set_elem_ext(set, catchall->elem);
5667 if (nft_set_elem_active(ext, genmask)) {
5673 catchall = kmalloc(sizeof(*catchall), GFP_KERNEL);
5677 catchall->elem = elem->priv;
5678 list_add_tail_rcu(&catchall->list, &set->catchall_list);
5683 static int nft_setelem_insert(const struct net *net,
5684 struct nft_set *set,
5685 const struct nft_set_elem *elem,
5686 struct nft_set_ext **ext, unsigned int flags)
5690 if (flags & NFT_SET_ELEM_CATCHALL)
5691 ret = nft_setelem_catchall_insert(net, set, elem, ext);
5693 ret = set->ops->insert(net, set, elem, ext);
5698 static bool nft_setelem_is_catchall(const struct nft_set *set,
5699 const struct nft_set_elem *elem)
5701 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5703 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
5704 *nft_set_ext_flags(ext) & NFT_SET_ELEM_CATCHALL)
5710 static void nft_setelem_activate(struct net *net, struct nft_set *set,
5711 struct nft_set_elem *elem)
5713 struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
5715 if (nft_setelem_is_catchall(set, elem)) {
5716 nft_set_elem_change_active(net, set, ext);
5717 nft_set_elem_clear_busy(ext);
5719 set->ops->activate(net, set, elem);
5723 static int nft_setelem_catchall_deactivate(const struct net *net,
5724 struct nft_set *set,
5725 struct nft_set_elem *elem)
5727 struct nft_set_elem_catchall *catchall;
5728 struct nft_set_ext *ext;
5730 list_for_each_entry(catchall, &set->catchall_list, list) {
5731 ext = nft_set_elem_ext(set, catchall->elem);
5732 if (!nft_is_active(net, ext) ||
5733 nft_set_elem_mark_busy(ext))
5737 elem->priv = catchall->elem;
5738 nft_set_elem_change_active(net, set, ext);
5745 static int __nft_setelem_deactivate(const struct net *net,
5746 struct nft_set *set,
5747 struct nft_set_elem *elem)
5751 priv = set->ops->deactivate(net, set, elem);
5762 static int nft_setelem_deactivate(const struct net *net,
5763 struct nft_set *set,
5764 struct nft_set_elem *elem, u32 flags)
5768 if (flags & NFT_SET_ELEM_CATCHALL)
5769 ret = nft_setelem_catchall_deactivate(net, set, elem);
5771 ret = __nft_setelem_deactivate(net, set, elem);
5776 static void nft_setelem_catchall_remove(const struct net *net,
5777 const struct nft_set *set,
5778 const struct nft_set_elem *elem)
5780 struct nft_set_elem_catchall *catchall, *next;
5782 list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
5783 if (catchall->elem == elem->priv) {
5784 list_del_rcu(&catchall->list);
5785 kfree_rcu(catchall, rcu);
5791 static void nft_setelem_remove(const struct net *net,
5792 const struct nft_set *set,
5793 const struct nft_set_elem *elem)
5795 if (nft_setelem_is_catchall(set, elem))
5796 nft_setelem_catchall_remove(net, set, elem);
5798 set->ops->remove(net, set, elem);
5801 static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
5802 const struct nlattr *attr, u32 nlmsg_flags)
5804 struct nft_expr *expr_array[NFT_SET_EXPR_MAX] = {};
5805 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
5806 u8 genmask = nft_genmask_next(ctx->net);
5807 u32 flags = 0, size = 0, num_exprs = 0;
5808 struct nft_set_ext_tmpl tmpl;
5809 struct nft_set_ext *ext, *ext2;
5810 struct nft_set_elem elem;
5811 struct nft_set_binding *binding;
5812 struct nft_object *obj = NULL;
5813 struct nft_userdata *udata;
5814 struct nft_data_desc desc;
5815 enum nft_registers dreg;
5816 struct nft_trans *trans;
5822 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
5823 nft_set_elem_policy, NULL);
5827 nft_set_ext_prepare(&tmpl);
5829 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
5833 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
5837 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
5839 if (set->flags & NFT_SET_MAP) {
5840 if (nla[NFTA_SET_ELEM_DATA] == NULL &&
5841 !(flags & NFT_SET_ELEM_INTERVAL_END))
5844 if (nla[NFTA_SET_ELEM_DATA] != NULL)
5848 if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
5849 (nla[NFTA_SET_ELEM_DATA] ||
5850 nla[NFTA_SET_ELEM_OBJREF] ||
5851 nla[NFTA_SET_ELEM_TIMEOUT] ||
5852 nla[NFTA_SET_ELEM_EXPIRATION] ||
5853 nla[NFTA_SET_ELEM_USERDATA] ||
5854 nla[NFTA_SET_ELEM_EXPR] ||
5855 nla[NFTA_SET_ELEM_EXPRESSIONS]))
5859 if (nla[NFTA_SET_ELEM_TIMEOUT] != NULL) {
5860 if (!(set->flags & NFT_SET_TIMEOUT))
5862 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_TIMEOUT],
5866 } else if (set->flags & NFT_SET_TIMEOUT) {
5867 timeout = set->timeout;
5871 if (nla[NFTA_SET_ELEM_EXPIRATION] != NULL) {
5872 if (!(set->flags & NFT_SET_TIMEOUT))
5874 err = nf_msecs_to_jiffies64(nla[NFTA_SET_ELEM_EXPIRATION],
5880 if (nla[NFTA_SET_ELEM_EXPR]) {
5881 struct nft_expr *expr;
5883 if (set->num_exprs && set->num_exprs != 1)
5886 expr = nft_set_elem_expr_alloc(ctx, set,
5887 nla[NFTA_SET_ELEM_EXPR]);
5889 return PTR_ERR(expr);
5891 expr_array[0] = expr;
5894 if (set->num_exprs && set->exprs[0]->ops != expr->ops) {
5896 goto err_set_elem_expr;
5898 } else if (nla[NFTA_SET_ELEM_EXPRESSIONS]) {
5899 struct nft_expr *expr;
5904 nla_for_each_nested(tmp, nla[NFTA_SET_ELEM_EXPRESSIONS], left) {
5905 if (i == NFT_SET_EXPR_MAX ||
5906 (set->num_exprs && set->num_exprs == i)) {
5908 goto err_set_elem_expr;
5910 if (nla_type(tmp) != NFTA_LIST_ELEM) {
5912 goto err_set_elem_expr;
5914 expr = nft_set_elem_expr_alloc(ctx, set, tmp);
5916 err = PTR_ERR(expr);
5917 goto err_set_elem_expr;
5919 expr_array[i] = expr;
5922 if (set->num_exprs && expr->ops != set->exprs[i]->ops) {
5924 goto err_set_elem_expr;
5928 if (set->num_exprs && set->num_exprs != i) {
5930 goto err_set_elem_expr;
5932 } else if (set->num_exprs > 0) {
5933 err = nft_set_elem_expr_clone(ctx, set, expr_array);
5935 goto err_set_elem_expr_clone;
5937 num_exprs = set->num_exprs;
5940 if (nla[NFTA_SET_ELEM_KEY]) {
5941 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
5942 nla[NFTA_SET_ELEM_KEY]);
5944 goto err_set_elem_expr;
5946 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
5949 if (nla[NFTA_SET_ELEM_KEY_END]) {
5950 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
5951 nla[NFTA_SET_ELEM_KEY_END]);
5955 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
5959 nft_set_ext_add(&tmpl, NFT_SET_EXT_EXPIRATION);
5960 if (timeout != set->timeout)
5961 nft_set_ext_add(&tmpl, NFT_SET_EXT_TIMEOUT);
5965 for (i = 0; i < num_exprs; i++)
5966 size += expr_array[i]->ops->size;
5968 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_EXPRESSIONS,
5969 sizeof(struct nft_set_elem_expr) +
5973 if (nla[NFTA_SET_ELEM_OBJREF] != NULL) {
5974 if (!(set->flags & NFT_SET_OBJECT)) {
5976 goto err_parse_key_end;
5978 obj = nft_obj_lookup(ctx->net, ctx->table,
5979 nla[NFTA_SET_ELEM_OBJREF],
5980 set->objtype, genmask);
5983 goto err_parse_key_end;
5985 nft_set_ext_add(&tmpl, NFT_SET_EXT_OBJREF);
5988 if (nla[NFTA_SET_ELEM_DATA] != NULL) {
5989 err = nft_setelem_parse_data(ctx, set, &desc, &elem.data.val,
5990 nla[NFTA_SET_ELEM_DATA]);
5992 goto err_parse_key_end;
5994 dreg = nft_type_to_reg(set->dtype);
5995 list_for_each_entry(binding, &set->bindings, list) {
5996 struct nft_ctx bind_ctx = {
5998 .family = ctx->family,
5999 .table = ctx->table,
6000 .chain = (struct nft_chain *)binding->chain,
6003 if (!(binding->flags & NFT_SET_MAP))
6006 err = nft_validate_register_store(&bind_ctx, dreg,
6008 desc.type, desc.len);
6010 goto err_parse_data;
6012 if (desc.type == NFT_DATA_VERDICT &&
6013 (elem.data.val.verdict.code == NFT_GOTO ||
6014 elem.data.val.verdict.code == NFT_JUMP))
6015 nft_validate_state_update(ctx->net,
6019 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_DATA, desc.len);
6022 /* The full maximum length of userdata can exceed the maximum
6023 * offset value (U8_MAX) for following extensions, therefor it
6024 * must be the last extension added.
6027 if (nla[NFTA_SET_ELEM_USERDATA] != NULL) {
6028 ulen = nla_len(nla[NFTA_SET_ELEM_USERDATA]);
6030 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_USERDATA,
6035 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6036 elem.key_end.val.data, elem.data.val.data,
6037 timeout, expiration, GFP_KERNEL_ACCOUNT);
6038 if (elem.priv == NULL)
6039 goto err_parse_data;
6041 ext = nft_set_elem_ext(set, elem.priv);
6043 *nft_set_ext_flags(ext) = flags;
6045 udata = nft_set_ext_userdata(ext);
6046 udata->len = ulen - 1;
6047 nla_memcpy(&udata->data, nla[NFTA_SET_ELEM_USERDATA], ulen);
6050 *nft_set_ext_obj(ext) = obj;
6053 err = nft_set_elem_expr_setup(ctx, ext, expr_array, num_exprs);
6057 trans = nft_trans_elem_alloc(ctx, NFT_MSG_NEWSETELEM, set);
6058 if (trans == NULL) {
6063 ext->genmask = nft_genmask_cur(ctx->net) | NFT_SET_ELEM_BUSY_MASK;
6065 err = nft_setelem_insert(ctx->net, set, &elem, &ext2, flags);
6067 if (err == -EEXIST) {
6068 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
6069 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
6070 nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
6071 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
6072 goto err_element_clash;
6073 if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
6074 nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
6075 memcmp(nft_set_ext_data(ext),
6076 nft_set_ext_data(ext2), set->dlen) != 0) ||
6077 (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) &&
6078 nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF) &&
6079 *nft_set_ext_obj(ext) != *nft_set_ext_obj(ext2)))
6080 goto err_element_clash;
6081 else if (!(nlmsg_flags & NLM_F_EXCL))
6083 } else if (err == -ENOTEMPTY) {
6084 /* ENOTEMPTY reports overlapping between this element
6085 * and an existing one.
6089 goto err_element_clash;
6092 if (!(flags & NFT_SET_ELEM_CATCHALL) && set->size &&
6093 !atomic_add_unless(&set->nelems, 1, set->size + set->ndeact)) {
6098 nft_trans_elem(trans) = elem;
6099 nft_trans_commit_list_add_tail(ctx->net, trans);
6103 nft_setelem_remove(ctx->net, set, &elem);
6110 nf_tables_set_elem_destroy(ctx, set, elem.priv);
6112 if (nla[NFTA_SET_ELEM_DATA] != NULL)
6113 nft_data_release(&elem.data.val, desc.type);
6115 nft_data_release(&elem.key_end.val, NFT_DATA_VALUE);
6117 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6119 for (i = 0; i < num_exprs && expr_array[i]; i++)
6120 nft_expr_destroy(ctx, expr_array[i]);
6121 err_set_elem_expr_clone:
6125 static int nf_tables_newsetelem(struct sk_buff *skb,
6126 const struct nfnl_info *info,
6127 const struct nlattr * const nla[])
6129 struct nftables_pernet *nft_net = nft_pernet(info->net);
6130 struct netlink_ext_ack *extack = info->extack;
6131 u8 genmask = nft_genmask_next(info->net);
6132 u8 family = info->nfmsg->nfgen_family;
6133 struct net *net = info->net;
6134 const struct nlattr *attr;
6135 struct nft_table *table;
6136 struct nft_set *set;
6140 if (nla[NFTA_SET_ELEM_LIST_ELEMENTS] == NULL)
6143 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6144 genmask, NETLINK_CB(skb).portid);
6145 if (IS_ERR(table)) {
6146 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6147 return PTR_ERR(table);
6150 set = nft_set_lookup_global(net, table, nla[NFTA_SET_ELEM_LIST_SET],
6151 nla[NFTA_SET_ELEM_LIST_SET_ID], genmask);
6153 return PTR_ERR(set);
6155 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6158 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6160 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6161 err = nft_add_set_elem(&ctx, set, attr, info->nlh->nlmsg_flags);
6163 NL_SET_BAD_ATTR(extack, attr);
6168 if (nft_net->validate_state == NFT_VALIDATE_DO)
6169 return nft_table_validate(net, table);
6175 * nft_data_hold - hold a nft_data item
6177 * @data: struct nft_data to release
6178 * @type: type of data
6180 * Hold a nft_data item. NFT_DATA_VALUE types can be silently discarded,
6181 * NFT_DATA_VERDICT bumps the reference to chains in case of NFT_JUMP and
6182 * NFT_GOTO verdicts. This function must be called on active data objects
6183 * from the second phase of the commit protocol.
6185 void nft_data_hold(const struct nft_data *data, enum nft_data_types type)
6187 struct nft_chain *chain;
6188 struct nft_rule *rule;
6190 if (type == NFT_DATA_VERDICT) {
6191 switch (data->verdict.code) {
6194 chain = data->verdict.chain;
6197 if (!nft_chain_is_bound(chain))
6200 chain->table->use++;
6201 list_for_each_entry(rule, &chain->rules, list)
6204 nft_chain_add(chain->table, chain);
6210 static void nft_setelem_data_activate(const struct net *net,
6211 const struct nft_set *set,
6212 struct nft_set_elem *elem)
6214 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6216 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6217 nft_data_hold(nft_set_ext_data(ext), set->dtype);
6218 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6219 (*nft_set_ext_obj(ext))->use++;
6222 static void nft_setelem_data_deactivate(const struct net *net,
6223 const struct nft_set *set,
6224 struct nft_set_elem *elem)
6226 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
6228 if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA))
6229 nft_data_release(nft_set_ext_data(ext), set->dtype);
6230 if (nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF))
6231 (*nft_set_ext_obj(ext))->use--;
6234 static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set,
6235 const struct nlattr *attr)
6237 struct nlattr *nla[NFTA_SET_ELEM_MAX + 1];
6238 struct nft_set_ext_tmpl tmpl;
6239 struct nft_set_elem elem;
6240 struct nft_set_ext *ext;
6241 struct nft_trans *trans;
6245 err = nla_parse_nested_deprecated(nla, NFTA_SET_ELEM_MAX, attr,
6246 nft_set_elem_policy, NULL);
6250 err = nft_setelem_parse_flags(set, nla[NFTA_SET_ELEM_FLAGS], &flags);
6254 if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
6257 nft_set_ext_prepare(&tmpl);
6260 nft_set_ext_add(&tmpl, NFT_SET_EXT_FLAGS);
6262 if (nla[NFTA_SET_ELEM_KEY]) {
6263 err = nft_setelem_parse_key(ctx, set, &elem.key.val,
6264 nla[NFTA_SET_ELEM_KEY]);
6268 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY, set->klen);
6271 if (nla[NFTA_SET_ELEM_KEY_END]) {
6272 err = nft_setelem_parse_key(ctx, set, &elem.key_end.val,
6273 nla[NFTA_SET_ELEM_KEY_END]);
6277 nft_set_ext_add_length(&tmpl, NFT_SET_EXT_KEY_END, set->klen);
6281 elem.priv = nft_set_elem_init(set, &tmpl, elem.key.val.data,
6282 elem.key_end.val.data, NULL, 0, 0,
6283 GFP_KERNEL_ACCOUNT);
6284 if (elem.priv == NULL)
6287 ext = nft_set_elem_ext(set, elem.priv);
6289 *nft_set_ext_flags(ext) = flags;
6291 trans = nft_trans_elem_alloc(ctx, NFT_MSG_DELSETELEM, set);
6295 err = nft_setelem_deactivate(ctx->net, set, &elem, flags);
6299 nft_setelem_data_deactivate(ctx->net, set, &elem);
6301 nft_trans_elem(trans) = elem;
6302 nft_trans_commit_list_add_tail(ctx->net, trans);
6310 nft_data_release(&elem.key.val, NFT_DATA_VALUE);
6314 static int nft_setelem_flush(const struct nft_ctx *ctx,
6315 struct nft_set *set,
6316 const struct nft_set_iter *iter,
6317 struct nft_set_elem *elem)
6319 struct nft_trans *trans;
6322 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6323 sizeof(struct nft_trans_elem), GFP_ATOMIC);
6327 if (!set->ops->flush(ctx->net, set, elem->priv)) {
6333 nft_setelem_data_deactivate(ctx->net, set, elem);
6334 nft_trans_elem_set(trans) = set;
6335 nft_trans_elem(trans) = *elem;
6336 nft_trans_commit_list_add_tail(ctx->net, trans);
6344 static int __nft_set_catchall_flush(const struct nft_ctx *ctx,
6345 struct nft_set *set,
6346 struct nft_set_elem *elem)
6348 struct nft_trans *trans;
6350 trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM,
6351 sizeof(struct nft_trans_elem), GFP_KERNEL);
6355 nft_setelem_data_deactivate(ctx->net, set, elem);
6356 nft_trans_elem_set(trans) = set;
6357 nft_trans_elem(trans) = *elem;
6358 nft_trans_commit_list_add_tail(ctx->net, trans);
6363 static int nft_set_catchall_flush(const struct nft_ctx *ctx,
6364 struct nft_set *set)
6366 u8 genmask = nft_genmask_next(ctx->net);
6367 struct nft_set_elem_catchall *catchall;
6368 struct nft_set_elem elem;
6369 struct nft_set_ext *ext;
6372 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
6373 ext = nft_set_elem_ext(set, catchall->elem);
6374 if (!nft_set_elem_active(ext, genmask) ||
6375 nft_set_elem_mark_busy(ext))
6378 elem.priv = catchall->elem;
6379 ret = __nft_set_catchall_flush(ctx, set, &elem);
6387 static int nft_set_flush(struct nft_ctx *ctx, struct nft_set *set, u8 genmask)
6389 struct nft_set_iter iter = {
6391 .fn = nft_setelem_flush,
6394 set->ops->walk(ctx, set, &iter);
6396 iter.err = nft_set_catchall_flush(ctx, set);
6401 static int nf_tables_delsetelem(struct sk_buff *skb,
6402 const struct nfnl_info *info,
6403 const struct nlattr * const nla[])
6405 struct netlink_ext_ack *extack = info->extack;
6406 u8 genmask = nft_genmask_next(info->net);
6407 u8 family = info->nfmsg->nfgen_family;
6408 struct net *net = info->net;
6409 const struct nlattr *attr;
6410 struct nft_table *table;
6411 struct nft_set *set;
6415 table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
6416 genmask, NETLINK_CB(skb).portid);
6417 if (IS_ERR(table)) {
6418 NL_SET_BAD_ATTR(extack, nla[NFTA_SET_ELEM_LIST_TABLE]);
6419 return PTR_ERR(table);
6422 set = nft_set_lookup(table, nla[NFTA_SET_ELEM_LIST_SET], genmask);
6424 return PTR_ERR(set);
6425 if (!list_empty(&set->bindings) && set->flags & NFT_SET_CONSTANT)
6428 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6430 if (!nla[NFTA_SET_ELEM_LIST_ELEMENTS])
6431 return nft_set_flush(&ctx, set, genmask);
6433 nla_for_each_nested(attr, nla[NFTA_SET_ELEM_LIST_ELEMENTS], rem) {
6434 err = nft_del_setelem(&ctx, set, attr);
6436 NL_SET_BAD_ATTR(extack, attr);
6443 void nft_set_gc_batch_release(struct rcu_head *rcu)
6445 struct nft_set_gc_batch *gcb;
6448 gcb = container_of(rcu, struct nft_set_gc_batch, head.rcu);
6449 for (i = 0; i < gcb->head.cnt; i++)
6450 nft_set_elem_destroy(gcb->head.set, gcb->elems[i], true);
6454 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
6457 struct nft_set_gc_batch *gcb;
6459 gcb = kzalloc(sizeof(*gcb), gfp);
6462 gcb->head.set = set;
6471 * nft_register_obj- register nf_tables stateful object type
6472 * @obj_type: object type
6474 * Registers the object type for use with nf_tables. Returns zero on
6475 * success or a negative errno code otherwise.
6477 int nft_register_obj(struct nft_object_type *obj_type)
6479 if (obj_type->type == NFT_OBJECT_UNSPEC)
6482 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6483 list_add_rcu(&obj_type->list, &nf_tables_objects);
6484 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6487 EXPORT_SYMBOL_GPL(nft_register_obj);
6490 * nft_unregister_obj - unregister nf_tables object type
6491 * @obj_type: object type
6493 * Unregisters the object type for use with nf_tables.
6495 void nft_unregister_obj(struct nft_object_type *obj_type)
6497 nfnl_lock(NFNL_SUBSYS_NFTABLES);
6498 list_del_rcu(&obj_type->list);
6499 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
6501 EXPORT_SYMBOL_GPL(nft_unregister_obj);
6503 struct nft_object *nft_obj_lookup(const struct net *net,
6504 const struct nft_table *table,
6505 const struct nlattr *nla, u32 objtype,
6508 struct nft_object_hash_key k = { .table = table };
6509 char search[NFT_OBJ_MAXNAMELEN];
6510 struct rhlist_head *tmp, *list;
6511 struct nft_object *obj;
6513 nla_strscpy(search, nla, sizeof(search));
6516 WARN_ON_ONCE(!rcu_read_lock_held() &&
6517 !lockdep_commit_lock_is_held(net));
6520 list = rhltable_lookup(&nft_objname_ht, &k, nft_objname_ht_params);
6524 rhl_for_each_entry_rcu(obj, tmp, list, rhlhead) {
6525 if (objtype == obj->ops->type->type &&
6526 nft_active_genmask(obj, genmask)) {
6533 return ERR_PTR(-ENOENT);
6535 EXPORT_SYMBOL_GPL(nft_obj_lookup);
6537 static struct nft_object *nft_obj_lookup_byhandle(const struct nft_table *table,
6538 const struct nlattr *nla,
6539 u32 objtype, u8 genmask)
6541 struct nft_object *obj;
6543 list_for_each_entry(obj, &table->objects, list) {
6544 if (be64_to_cpu(nla_get_be64(nla)) == obj->handle &&
6545 objtype == obj->ops->type->type &&
6546 nft_active_genmask(obj, genmask))
6549 return ERR_PTR(-ENOENT);
6552 static const struct nla_policy nft_obj_policy[NFTA_OBJ_MAX + 1] = {
6553 [NFTA_OBJ_TABLE] = { .type = NLA_STRING,
6554 .len = NFT_TABLE_MAXNAMELEN - 1 },
6555 [NFTA_OBJ_NAME] = { .type = NLA_STRING,
6556 .len = NFT_OBJ_MAXNAMELEN - 1 },
6557 [NFTA_OBJ_TYPE] = { .type = NLA_U32 },
6558 [NFTA_OBJ_DATA] = { .type = NLA_NESTED },
6559 [NFTA_OBJ_HANDLE] = { .type = NLA_U64},
6560 [NFTA_OBJ_USERDATA] = { .type = NLA_BINARY,
6561 .len = NFT_USERDATA_MAXLEN },
6564 static struct nft_object *nft_obj_init(const struct nft_ctx *ctx,
6565 const struct nft_object_type *type,
6566 const struct nlattr *attr)
6569 const struct nft_object_ops *ops;
6570 struct nft_object *obj;
6573 tb = kmalloc_array(type->maxattr + 1, sizeof(*tb), GFP_KERNEL);
6578 err = nla_parse_nested_deprecated(tb, type->maxattr, attr,
6579 type->policy, NULL);
6583 memset(tb, 0, sizeof(tb[0]) * (type->maxattr + 1));
6586 if (type->select_ops) {
6587 ops = type->select_ops(ctx, (const struct nlattr * const *)tb);
6597 obj = kzalloc(sizeof(*obj) + ops->size, GFP_KERNEL_ACCOUNT);
6601 err = ops->init(ctx, (const struct nlattr * const *)tb, obj);
6614 return ERR_PTR(err);
6617 static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
6618 struct nft_object *obj, bool reset)
6620 struct nlattr *nest;
6622 nest = nla_nest_start_noflag(skb, attr);
6624 goto nla_put_failure;
6625 if (obj->ops->dump(skb, obj, reset) < 0)
6626 goto nla_put_failure;
6627 nla_nest_end(skb, nest);
6634 static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
6636 const struct nft_object_type *type;
6638 list_for_each_entry(type, &nf_tables_objects, list) {
6639 if (objtype == type->type)
6645 static const struct nft_object_type *
6646 nft_obj_type_get(struct net *net, u32 objtype)
6648 const struct nft_object_type *type;
6650 type = __nft_obj_type_get(objtype);
6651 if (type != NULL && try_module_get(type->owner))
6654 lockdep_nfnl_nft_mutex_not_held();
6655 #ifdef CONFIG_MODULES
6657 if (nft_request_module(net, "nft-obj-%u", objtype) == -EAGAIN)
6658 return ERR_PTR(-EAGAIN);
6661 return ERR_PTR(-ENOENT);
6664 static int nf_tables_updobj(const struct nft_ctx *ctx,
6665 const struct nft_object_type *type,
6666 const struct nlattr *attr,
6667 struct nft_object *obj)
6669 struct nft_object *newobj;
6670 struct nft_trans *trans;
6673 if (!try_module_get(type->owner))
6676 trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ,
6677 sizeof(struct nft_trans_obj));
6681 newobj = nft_obj_init(ctx, type, attr);
6682 if (IS_ERR(newobj)) {
6683 err = PTR_ERR(newobj);
6684 goto err_free_trans;
6687 nft_trans_obj(trans) = obj;
6688 nft_trans_obj_update(trans) = true;
6689 nft_trans_obj_newobj(trans) = newobj;
6690 nft_trans_commit_list_add_tail(ctx->net, trans);
6697 module_put(type->owner);
6701 static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
6702 const struct nlattr * const nla[])
6704 struct netlink_ext_ack *extack = info->extack;
6705 u8 genmask = nft_genmask_next(info->net);
6706 u8 family = info->nfmsg->nfgen_family;
6707 const struct nft_object_type *type;
6708 struct net *net = info->net;
6709 struct nft_table *table;
6710 struct nft_object *obj;
6715 if (!nla[NFTA_OBJ_TYPE] ||
6716 !nla[NFTA_OBJ_NAME] ||
6717 !nla[NFTA_OBJ_DATA])
6720 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
6721 NETLINK_CB(skb).portid);
6722 if (IS_ERR(table)) {
6723 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6724 return PTR_ERR(table);
6727 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6728 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6731 if (err != -ENOENT) {
6732 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6736 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
6737 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6740 if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
6743 type = __nft_obj_type_get(objtype);
6744 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6746 return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
6749 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
6751 type = nft_obj_type_get(net, objtype);
6753 return PTR_ERR(type);
6755 obj = nft_obj_init(&ctx, type, nla[NFTA_OBJ_DATA]);
6760 obj->key.table = table;
6761 obj->handle = nf_tables_alloc_handle(table);
6763 obj->key.name = nla_strdup(nla[NFTA_OBJ_NAME], GFP_KERNEL_ACCOUNT);
6764 if (!obj->key.name) {
6769 if (nla[NFTA_OBJ_USERDATA]) {
6770 obj->udata = nla_memdup(nla[NFTA_OBJ_USERDATA], GFP_KERNEL);
6771 if (obj->udata == NULL)
6774 obj->udlen = nla_len(nla[NFTA_OBJ_USERDATA]);
6777 err = nft_trans_obj_add(&ctx, NFT_MSG_NEWOBJ, obj);
6781 err = rhltable_insert(&nft_objname_ht, &obj->rhlhead,
6782 nft_objname_ht_params);
6786 list_add_tail_rcu(&obj->list, &table->objects);
6790 /* queued in transaction log */
6791 INIT_LIST_HEAD(&obj->list);
6796 kfree(obj->key.name);
6798 if (obj->ops->destroy)
6799 obj->ops->destroy(&ctx, obj);
6802 module_put(type->owner);
6806 static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
6807 u32 portid, u32 seq, int event, u32 flags,
6808 int family, const struct nft_table *table,
6809 struct nft_object *obj, bool reset)
6811 struct nlmsghdr *nlh;
6813 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
6814 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
6815 NFNETLINK_V0, nft_base_seq(net));
6817 goto nla_put_failure;
6819 if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
6820 nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
6821 nla_put_be32(skb, NFTA_OBJ_TYPE, htonl(obj->ops->type->type)) ||
6822 nla_put_be32(skb, NFTA_OBJ_USE, htonl(obj->use)) ||
6823 nft_object_dump(skb, NFTA_OBJ_DATA, obj, reset) ||
6824 nla_put_be64(skb, NFTA_OBJ_HANDLE, cpu_to_be64(obj->handle),
6826 goto nla_put_failure;
6829 nla_put(skb, NFTA_OBJ_USERDATA, obj->udlen, obj->udata))
6830 goto nla_put_failure;
6832 nlmsg_end(skb, nlh);
6836 nlmsg_trim(skb, nlh);
6840 struct nft_obj_filter {
6845 static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
6847 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
6848 const struct nft_table *table;
6849 unsigned int idx = 0, s_idx = cb->args[0];
6850 struct nft_obj_filter *filter = cb->data;
6851 struct net *net = sock_net(skb->sk);
6852 int family = nfmsg->nfgen_family;
6853 struct nftables_pernet *nft_net;
6854 struct nft_object *obj;
6857 if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
6861 nft_net = nft_pernet(net);
6862 cb->seq = nft_net->base_seq;
6864 list_for_each_entry_rcu(table, &nft_net->tables, list) {
6865 if (family != NFPROTO_UNSPEC && family != table->family)
6868 list_for_each_entry_rcu(obj, &table->objects, list) {
6869 if (!nft_is_active(net, obj))
6874 memset(&cb->args[1], 0,
6875 sizeof(cb->args) - sizeof(cb->args[0]));
6876 if (filter && filter->table &&
6877 strcmp(filter->table, table->name))
6880 filter->type != NFT_OBJECT_UNSPEC &&
6881 obj->ops->type->type != filter->type)
6884 char *buf = kasprintf(GFP_ATOMIC,
6889 audit_log_nfcfg(buf,
6892 AUDIT_NFT_OP_OBJ_RESET,
6897 if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
6900 NLM_F_MULTI | NLM_F_APPEND,
6901 table->family, table,
6905 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
6917 static int nf_tables_dump_obj_start(struct netlink_callback *cb)
6919 const struct nlattr * const *nla = cb->data;
6920 struct nft_obj_filter *filter = NULL;
6922 if (nla[NFTA_OBJ_TABLE] || nla[NFTA_OBJ_TYPE]) {
6923 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
6927 if (nla[NFTA_OBJ_TABLE]) {
6928 filter->table = nla_strdup(nla[NFTA_OBJ_TABLE], GFP_ATOMIC);
6929 if (!filter->table) {
6935 if (nla[NFTA_OBJ_TYPE])
6936 filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6943 static int nf_tables_dump_obj_done(struct netlink_callback *cb)
6945 struct nft_obj_filter *filter = cb->data;
6948 kfree(filter->table);
6955 /* called with rcu_read_lock held */
6956 static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
6957 const struct nlattr * const nla[])
6959 struct netlink_ext_ack *extack = info->extack;
6960 u8 genmask = nft_genmask_cur(info->net);
6961 u8 family = info->nfmsg->nfgen_family;
6962 const struct nft_table *table;
6963 struct net *net = info->net;
6964 struct nft_object *obj;
6965 struct sk_buff *skb2;
6970 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
6971 struct netlink_dump_control c = {
6972 .start = nf_tables_dump_obj_start,
6973 .dump = nf_tables_dump_obj,
6974 .done = nf_tables_dump_obj_done,
6975 .module = THIS_MODULE,
6976 .data = (void *)nla,
6979 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
6982 if (!nla[NFTA_OBJ_NAME] ||
6983 !nla[NFTA_OBJ_TYPE])
6986 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
6987 if (IS_ERR(table)) {
6988 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
6989 return PTR_ERR(table);
6992 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
6993 obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
6995 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
6996 return PTR_ERR(obj);
6999 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7003 if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
7007 const struct nftables_pernet *nft_net;
7010 nft_net = nft_pernet(net);
7011 buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, nft_net->base_seq);
7013 audit_log_nfcfg(buf,
7016 AUDIT_NFT_OP_OBJ_RESET,
7021 err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
7022 info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
7023 family, table, obj, reset);
7025 goto err_fill_obj_info;
7027 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7034 static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
7036 if (obj->ops->destroy)
7037 obj->ops->destroy(ctx, obj);
7039 module_put(obj->ops->type->owner);
7040 kfree(obj->key.name);
7045 static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
7046 const struct nlattr * const nla[])
7048 struct netlink_ext_ack *extack = info->extack;
7049 u8 genmask = nft_genmask_next(info->net);
7050 u8 family = info->nfmsg->nfgen_family;
7051 struct net *net = info->net;
7052 const struct nlattr *attr;
7053 struct nft_table *table;
7054 struct nft_object *obj;
7058 if (!nla[NFTA_OBJ_TYPE] ||
7059 (!nla[NFTA_OBJ_NAME] && !nla[NFTA_OBJ_HANDLE]))
7062 table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask,
7063 NETLINK_CB(skb).portid);
7064 if (IS_ERR(table)) {
7065 NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
7066 return PTR_ERR(table);
7069 objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
7070 if (nla[NFTA_OBJ_HANDLE]) {
7071 attr = nla[NFTA_OBJ_HANDLE];
7072 obj = nft_obj_lookup_byhandle(table, attr, objtype, genmask);
7074 attr = nla[NFTA_OBJ_NAME];
7075 obj = nft_obj_lookup(net, table, attr, objtype, genmask);
7079 NL_SET_BAD_ATTR(extack, attr);
7080 return PTR_ERR(obj);
7083 NL_SET_BAD_ATTR(extack, attr);
7087 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7089 return nft_delobj(&ctx, obj);
7092 void nft_obj_notify(struct net *net, const struct nft_table *table,
7093 struct nft_object *obj, u32 portid, u32 seq, int event,
7094 u16 flags, int family, int report, gfp_t gfp)
7096 struct nftables_pernet *nft_net = nft_pernet(net);
7097 struct sk_buff *skb;
7099 char *buf = kasprintf(gfp, "%s:%u",
7100 table->name, nft_net->base_seq);
7102 audit_log_nfcfg(buf,
7105 event == NFT_MSG_NEWOBJ ?
7106 AUDIT_NFT_OP_OBJ_REGISTER :
7107 AUDIT_NFT_OP_OBJ_UNREGISTER,
7112 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
7115 skb = nlmsg_new(NLMSG_GOODSIZE, gfp);
7119 err = nf_tables_fill_obj_info(skb, net, portid, seq, event,
7120 flags & (NLM_F_CREATE | NLM_F_EXCL),
7121 family, table, obj, false);
7127 nft_notify_enqueue(skb, report, &nft_net->notify_list);
7130 nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
7132 EXPORT_SYMBOL_GPL(nft_obj_notify);
7134 static void nf_tables_obj_notify(const struct nft_ctx *ctx,
7135 struct nft_object *obj, int event)
7137 nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
7138 ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
7144 void nft_register_flowtable_type(struct nf_flowtable_type *type)
7146 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7147 list_add_tail_rcu(&type->list, &nf_tables_flowtables);
7148 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7150 EXPORT_SYMBOL_GPL(nft_register_flowtable_type);
7152 void nft_unregister_flowtable_type(struct nf_flowtable_type *type)
7154 nfnl_lock(NFNL_SUBSYS_NFTABLES);
7155 list_del_rcu(&type->list);
7156 nfnl_unlock(NFNL_SUBSYS_NFTABLES);
7158 EXPORT_SYMBOL_GPL(nft_unregister_flowtable_type);
7160 static const struct nla_policy nft_flowtable_policy[NFTA_FLOWTABLE_MAX + 1] = {
7161 [NFTA_FLOWTABLE_TABLE] = { .type = NLA_STRING,
7162 .len = NFT_NAME_MAXLEN - 1 },
7163 [NFTA_FLOWTABLE_NAME] = { .type = NLA_STRING,
7164 .len = NFT_NAME_MAXLEN - 1 },
7165 [NFTA_FLOWTABLE_HOOK] = { .type = NLA_NESTED },
7166 [NFTA_FLOWTABLE_HANDLE] = { .type = NLA_U64 },
7167 [NFTA_FLOWTABLE_FLAGS] = { .type = NLA_U32 },
7170 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
7171 const struct nlattr *nla, u8 genmask)
7173 struct nft_flowtable *flowtable;
7175 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7176 if (!nla_strcmp(nla, flowtable->name) &&
7177 nft_active_genmask(flowtable, genmask))
7180 return ERR_PTR(-ENOENT);
7182 EXPORT_SYMBOL_GPL(nft_flowtable_lookup);
7184 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
7185 struct nft_flowtable *flowtable,
7186 enum nft_trans_phase phase)
7189 case NFT_TRANS_PREPARE:
7190 case NFT_TRANS_ABORT:
7191 case NFT_TRANS_RELEASE:
7198 EXPORT_SYMBOL_GPL(nf_tables_deactivate_flowtable);
7200 static struct nft_flowtable *
7201 nft_flowtable_lookup_byhandle(const struct nft_table *table,
7202 const struct nlattr *nla, u8 genmask)
7204 struct nft_flowtable *flowtable;
7206 list_for_each_entry(flowtable, &table->flowtables, list) {
7207 if (be64_to_cpu(nla_get_be64(nla)) == flowtable->handle &&
7208 nft_active_genmask(flowtable, genmask))
7211 return ERR_PTR(-ENOENT);
7214 struct nft_flowtable_hook {
7217 struct list_head list;
7220 static const struct nla_policy nft_flowtable_hook_policy[NFTA_FLOWTABLE_HOOK_MAX + 1] = {
7221 [NFTA_FLOWTABLE_HOOK_NUM] = { .type = NLA_U32 },
7222 [NFTA_FLOWTABLE_HOOK_PRIORITY] = { .type = NLA_U32 },
7223 [NFTA_FLOWTABLE_HOOK_DEVS] = { .type = NLA_NESTED },
7226 static int nft_flowtable_parse_hook(const struct nft_ctx *ctx,
7227 const struct nlattr *attr,
7228 struct nft_flowtable_hook *flowtable_hook,
7229 struct nft_flowtable *flowtable, bool add)
7231 struct nlattr *tb[NFTA_FLOWTABLE_HOOK_MAX + 1];
7232 struct nft_hook *hook;
7233 int hooknum, priority;
7236 INIT_LIST_HEAD(&flowtable_hook->list);
7238 err = nla_parse_nested_deprecated(tb, NFTA_FLOWTABLE_HOOK_MAX, attr,
7239 nft_flowtable_hook_policy, NULL);
7244 if (!tb[NFTA_FLOWTABLE_HOOK_NUM] ||
7245 !tb[NFTA_FLOWTABLE_HOOK_PRIORITY])
7248 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7249 if (hooknum != NF_NETDEV_INGRESS)
7252 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7254 flowtable_hook->priority = priority;
7255 flowtable_hook->num = hooknum;
7257 if (tb[NFTA_FLOWTABLE_HOOK_NUM]) {
7258 hooknum = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_NUM]));
7259 if (hooknum != flowtable->hooknum)
7263 if (tb[NFTA_FLOWTABLE_HOOK_PRIORITY]) {
7264 priority = ntohl(nla_get_be32(tb[NFTA_FLOWTABLE_HOOK_PRIORITY]));
7265 if (priority != flowtable->data.priority)
7269 flowtable_hook->priority = flowtable->data.priority;
7270 flowtable_hook->num = flowtable->hooknum;
7273 if (tb[NFTA_FLOWTABLE_HOOK_DEVS]) {
7274 err = nf_tables_parse_netdev_hooks(ctx->net,
7275 tb[NFTA_FLOWTABLE_HOOK_DEVS],
7276 &flowtable_hook->list);
7281 list_for_each_entry(hook, &flowtable_hook->list, list) {
7282 hook->ops.pf = NFPROTO_NETDEV;
7283 hook->ops.hooknum = flowtable_hook->num;
7284 hook->ops.priority = flowtable_hook->priority;
7285 hook->ops.priv = &flowtable->data;
7286 hook->ops.hook = flowtable->data.type->hook;
7292 static const struct nf_flowtable_type *__nft_flowtable_type_get(u8 family)
7294 const struct nf_flowtable_type *type;
7296 list_for_each_entry(type, &nf_tables_flowtables, list) {
7297 if (family == type->family)
7303 static const struct nf_flowtable_type *
7304 nft_flowtable_type_get(struct net *net, u8 family)
7306 const struct nf_flowtable_type *type;
7308 type = __nft_flowtable_type_get(family);
7309 if (type != NULL && try_module_get(type->owner))
7312 lockdep_nfnl_nft_mutex_not_held();
7313 #ifdef CONFIG_MODULES
7315 if (nft_request_module(net, "nf-flowtable-%u", family) == -EAGAIN)
7316 return ERR_PTR(-EAGAIN);
7319 return ERR_PTR(-ENOENT);
7322 /* Only called from error and netdev event paths. */
7323 static void nft_unregister_flowtable_hook(struct net *net,
7324 struct nft_flowtable *flowtable,
7325 struct nft_hook *hook)
7327 nf_unregister_net_hook(net, &hook->ops);
7328 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7332 static void __nft_unregister_flowtable_net_hooks(struct net *net,
7333 struct list_head *hook_list,
7334 bool release_netdev)
7336 struct nft_hook *hook, *next;
7338 list_for_each_entry_safe(hook, next, hook_list, list) {
7339 nf_unregister_net_hook(net, &hook->ops);
7340 if (release_netdev) {
7341 list_del(&hook->list);
7342 kfree_rcu(hook, rcu);
7347 static void nft_unregister_flowtable_net_hooks(struct net *net,
7348 struct list_head *hook_list)
7350 __nft_unregister_flowtable_net_hooks(net, hook_list, false);
7353 static int nft_register_flowtable_net_hooks(struct net *net,
7354 struct nft_table *table,
7355 struct list_head *hook_list,
7356 struct nft_flowtable *flowtable)
7358 struct nft_hook *hook, *hook2, *next;
7359 struct nft_flowtable *ft;
7362 list_for_each_entry(hook, hook_list, list) {
7363 list_for_each_entry(ft, &table->flowtables, list) {
7364 if (!nft_is_active_next(net, ft))
7367 list_for_each_entry(hook2, &ft->hook_list, list) {
7368 if (hook->ops.dev == hook2->ops.dev &&
7369 hook->ops.pf == hook2->ops.pf) {
7371 goto err_unregister_net_hooks;
7376 err = flowtable->data.type->setup(&flowtable->data,
7380 goto err_unregister_net_hooks;
7382 err = nf_register_net_hook(net, &hook->ops);
7384 flowtable->data.type->setup(&flowtable->data,
7387 goto err_unregister_net_hooks;
7395 err_unregister_net_hooks:
7396 list_for_each_entry_safe(hook, next, hook_list, list) {
7400 nft_unregister_flowtable_hook(net, flowtable, hook);
7401 list_del_rcu(&hook->list);
7402 kfree_rcu(hook, rcu);
7408 static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
7410 struct nft_hook *hook, *next;
7412 list_for_each_entry_safe(hook, next, hook_list, list) {
7413 list_del_rcu(&hook->list);
7414 kfree_rcu(hook, rcu);
7418 static int nft_flowtable_update(struct nft_ctx *ctx, const struct nlmsghdr *nlh,
7419 struct nft_flowtable *flowtable)
7421 const struct nlattr * const *nla = ctx->nla;
7422 struct nft_flowtable_hook flowtable_hook;
7423 struct nft_hook *hook, *next;
7424 struct nft_trans *trans;
7425 bool unregister = false;
7429 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7430 &flowtable_hook, flowtable, false);
7434 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7435 if (nft_hook_list_find(&flowtable->hook_list, hook)) {
7436 list_del(&hook->list);
7441 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7442 flags = ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7443 if (flags & ~NFT_FLOWTABLE_MASK) {
7445 goto err_flowtable_update_hook;
7447 if ((flowtable->data.flags & NFT_FLOWTABLE_HW_OFFLOAD) ^
7448 (flags & NFT_FLOWTABLE_HW_OFFLOAD)) {
7450 goto err_flowtable_update_hook;
7453 flags = flowtable->data.flags;
7456 err = nft_register_flowtable_net_hooks(ctx->net, ctx->table,
7457 &flowtable_hook.list, flowtable);
7459 goto err_flowtable_update_hook;
7461 trans = nft_trans_alloc(ctx, NFT_MSG_NEWFLOWTABLE,
7462 sizeof(struct nft_trans_flowtable));
7466 goto err_flowtable_update_hook;
7469 nft_trans_flowtable_flags(trans) = flags;
7470 nft_trans_flowtable(trans) = flowtable;
7471 nft_trans_flowtable_update(trans) = true;
7472 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7473 list_splice(&flowtable_hook.list, &nft_trans_flowtable_hooks(trans));
7475 nft_trans_commit_list_add_tail(ctx->net, trans);
7479 err_flowtable_update_hook:
7480 list_for_each_entry_safe(hook, next, &flowtable_hook.list, list) {
7482 nft_unregister_flowtable_hook(ctx->net, flowtable, hook);
7483 list_del_rcu(&hook->list);
7484 kfree_rcu(hook, rcu);
7491 static int nf_tables_newflowtable(struct sk_buff *skb,
7492 const struct nfnl_info *info,
7493 const struct nlattr * const nla[])
7495 struct netlink_ext_ack *extack = info->extack;
7496 struct nft_flowtable_hook flowtable_hook;
7497 u8 genmask = nft_genmask_next(info->net);
7498 u8 family = info->nfmsg->nfgen_family;
7499 const struct nf_flowtable_type *type;
7500 struct nft_flowtable *flowtable;
7501 struct nft_hook *hook, *next;
7502 struct net *net = info->net;
7503 struct nft_table *table;
7507 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7508 !nla[NFTA_FLOWTABLE_NAME] ||
7509 !nla[NFTA_FLOWTABLE_HOOK])
7512 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7513 genmask, NETLINK_CB(skb).portid);
7514 if (IS_ERR(table)) {
7515 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7516 return PTR_ERR(table);
7519 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7521 if (IS_ERR(flowtable)) {
7522 err = PTR_ERR(flowtable);
7523 if (err != -ENOENT) {
7524 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7528 if (info->nlh->nlmsg_flags & NLM_F_EXCL) {
7529 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_NAME]);
7533 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7535 return nft_flowtable_update(&ctx, info->nlh, flowtable);
7538 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7540 flowtable = kzalloc(sizeof(*flowtable), GFP_KERNEL_ACCOUNT);
7544 flowtable->table = table;
7545 flowtable->handle = nf_tables_alloc_handle(table);
7546 INIT_LIST_HEAD(&flowtable->hook_list);
7548 flowtable->name = nla_strdup(nla[NFTA_FLOWTABLE_NAME], GFP_KERNEL_ACCOUNT);
7549 if (!flowtable->name) {
7554 type = nft_flowtable_type_get(net, family);
7556 err = PTR_ERR(type);
7560 if (nla[NFTA_FLOWTABLE_FLAGS]) {
7561 flowtable->data.flags =
7562 ntohl(nla_get_be32(nla[NFTA_FLOWTABLE_FLAGS]));
7563 if (flowtable->data.flags & ~NFT_FLOWTABLE_MASK) {
7569 write_pnet(&flowtable->data.net, net);
7570 flowtable->data.type = type;
7571 err = type->init(&flowtable->data);
7575 err = nft_flowtable_parse_hook(&ctx, nla[NFTA_FLOWTABLE_HOOK],
7576 &flowtable_hook, flowtable, true);
7580 list_splice(&flowtable_hook.list, &flowtable->hook_list);
7581 flowtable->data.priority = flowtable_hook.priority;
7582 flowtable->hooknum = flowtable_hook.num;
7584 err = nft_register_flowtable_net_hooks(ctx.net, table,
7585 &flowtable->hook_list,
7588 nft_flowtable_hooks_destroy(&flowtable->hook_list);
7592 err = nft_trans_flowtable_add(&ctx, NFT_MSG_NEWFLOWTABLE, flowtable);
7596 list_add_tail_rcu(&flowtable->list, &table->flowtables);
7601 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7602 nft_unregister_flowtable_hook(net, flowtable, hook);
7603 list_del_rcu(&hook->list);
7604 kfree_rcu(hook, rcu);
7607 flowtable->data.type->free(&flowtable->data);
7609 module_put(type->owner);
7611 kfree(flowtable->name);
7617 static void nft_flowtable_hook_release(struct nft_flowtable_hook *flowtable_hook)
7619 struct nft_hook *this, *next;
7621 list_for_each_entry_safe(this, next, &flowtable_hook->list, list) {
7622 list_del(&this->list);
7627 static int nft_delflowtable_hook(struct nft_ctx *ctx,
7628 struct nft_flowtable *flowtable)
7630 const struct nlattr * const *nla = ctx->nla;
7631 struct nft_flowtable_hook flowtable_hook;
7632 LIST_HEAD(flowtable_del_list);
7633 struct nft_hook *this, *hook;
7634 struct nft_trans *trans;
7637 err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
7638 &flowtable_hook, flowtable, false);
7642 list_for_each_entry(this, &flowtable_hook.list, list) {
7643 hook = nft_hook_list_find(&flowtable->hook_list, this);
7646 goto err_flowtable_del_hook;
7648 list_move(&hook->list, &flowtable_del_list);
7651 trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
7652 sizeof(struct nft_trans_flowtable));
7655 goto err_flowtable_del_hook;
7658 nft_trans_flowtable(trans) = flowtable;
7659 nft_trans_flowtable_update(trans) = true;
7660 INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
7661 list_splice(&flowtable_del_list, &nft_trans_flowtable_hooks(trans));
7662 nft_flowtable_hook_release(&flowtable_hook);
7664 nft_trans_commit_list_add_tail(ctx->net, trans);
7668 err_flowtable_del_hook:
7669 list_splice(&flowtable_del_list, &flowtable->hook_list);
7670 nft_flowtable_hook_release(&flowtable_hook);
7675 static int nf_tables_delflowtable(struct sk_buff *skb,
7676 const struct nfnl_info *info,
7677 const struct nlattr * const nla[])
7679 struct netlink_ext_ack *extack = info->extack;
7680 u8 genmask = nft_genmask_next(info->net);
7681 u8 family = info->nfmsg->nfgen_family;
7682 struct nft_flowtable *flowtable;
7683 struct net *net = info->net;
7684 const struct nlattr *attr;
7685 struct nft_table *table;
7688 if (!nla[NFTA_FLOWTABLE_TABLE] ||
7689 (!nla[NFTA_FLOWTABLE_NAME] &&
7690 !nla[NFTA_FLOWTABLE_HANDLE]))
7693 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7694 genmask, NETLINK_CB(skb).portid);
7695 if (IS_ERR(table)) {
7696 NL_SET_BAD_ATTR(extack, nla[NFTA_FLOWTABLE_TABLE]);
7697 return PTR_ERR(table);
7700 if (nla[NFTA_FLOWTABLE_HANDLE]) {
7701 attr = nla[NFTA_FLOWTABLE_HANDLE];
7702 flowtable = nft_flowtable_lookup_byhandle(table, attr, genmask);
7704 attr = nla[NFTA_FLOWTABLE_NAME];
7705 flowtable = nft_flowtable_lookup(table, attr, genmask);
7708 if (IS_ERR(flowtable)) {
7709 NL_SET_BAD_ATTR(extack, attr);
7710 return PTR_ERR(flowtable);
7713 nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
7715 if (nla[NFTA_FLOWTABLE_HOOK])
7716 return nft_delflowtable_hook(&ctx, flowtable);
7718 if (flowtable->use > 0) {
7719 NL_SET_BAD_ATTR(extack, attr);
7723 return nft_delflowtable(&ctx, flowtable);
7726 static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
7727 u32 portid, u32 seq, int event,
7728 u32 flags, int family,
7729 struct nft_flowtable *flowtable,
7730 struct list_head *hook_list)
7732 struct nlattr *nest, *nest_devs;
7733 struct nft_hook *hook;
7734 struct nlmsghdr *nlh;
7736 event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, event);
7737 nlh = nfnl_msg_put(skb, portid, seq, event, flags, family,
7738 NFNETLINK_V0, nft_base_seq(net));
7740 goto nla_put_failure;
7742 if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
7743 nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
7744 nla_put_be32(skb, NFTA_FLOWTABLE_USE, htonl(flowtable->use)) ||
7745 nla_put_be64(skb, NFTA_FLOWTABLE_HANDLE, cpu_to_be64(flowtable->handle),
7746 NFTA_FLOWTABLE_PAD) ||
7747 nla_put_be32(skb, NFTA_FLOWTABLE_FLAGS, htonl(flowtable->data.flags)))
7748 goto nla_put_failure;
7750 nest = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK);
7752 goto nla_put_failure;
7753 if (nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_NUM, htonl(flowtable->hooknum)) ||
7754 nla_put_be32(skb, NFTA_FLOWTABLE_HOOK_PRIORITY, htonl(flowtable->data.priority)))
7755 goto nla_put_failure;
7757 nest_devs = nla_nest_start_noflag(skb, NFTA_FLOWTABLE_HOOK_DEVS);
7759 goto nla_put_failure;
7761 list_for_each_entry_rcu(hook, hook_list, list) {
7762 if (nla_put_string(skb, NFTA_DEVICE_NAME, hook->ops.dev->name))
7763 goto nla_put_failure;
7765 nla_nest_end(skb, nest_devs);
7766 nla_nest_end(skb, nest);
7768 nlmsg_end(skb, nlh);
7772 nlmsg_trim(skb, nlh);
7776 struct nft_flowtable_filter {
7780 static int nf_tables_dump_flowtable(struct sk_buff *skb,
7781 struct netlink_callback *cb)
7783 const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
7784 struct nft_flowtable_filter *filter = cb->data;
7785 unsigned int idx = 0, s_idx = cb->args[0];
7786 struct net *net = sock_net(skb->sk);
7787 int family = nfmsg->nfgen_family;
7788 struct nft_flowtable *flowtable;
7789 struct nftables_pernet *nft_net;
7790 const struct nft_table *table;
7793 nft_net = nft_pernet(net);
7794 cb->seq = nft_net->base_seq;
7796 list_for_each_entry_rcu(table, &nft_net->tables, list) {
7797 if (family != NFPROTO_UNSPEC && family != table->family)
7800 list_for_each_entry_rcu(flowtable, &table->flowtables, list) {
7801 if (!nft_is_active(net, flowtable))
7806 memset(&cb->args[1], 0,
7807 sizeof(cb->args) - sizeof(cb->args[0]));
7808 if (filter && filter->table &&
7809 strcmp(filter->table, table->name))
7812 if (nf_tables_fill_flowtable_info(skb, net, NETLINK_CB(cb->skb).portid,
7814 NFT_MSG_NEWFLOWTABLE,
7815 NLM_F_MULTI | NLM_F_APPEND,
7818 &flowtable->hook_list) < 0)
7821 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
7833 static int nf_tables_dump_flowtable_start(struct netlink_callback *cb)
7835 const struct nlattr * const *nla = cb->data;
7836 struct nft_flowtable_filter *filter = NULL;
7838 if (nla[NFTA_FLOWTABLE_TABLE]) {
7839 filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
7843 filter->table = nla_strdup(nla[NFTA_FLOWTABLE_TABLE],
7845 if (!filter->table) {
7855 static int nf_tables_dump_flowtable_done(struct netlink_callback *cb)
7857 struct nft_flowtable_filter *filter = cb->data;
7862 kfree(filter->table);
7868 /* called with rcu_read_lock held */
7869 static int nf_tables_getflowtable(struct sk_buff *skb,
7870 const struct nfnl_info *info,
7871 const struct nlattr * const nla[])
7873 u8 genmask = nft_genmask_cur(info->net);
7874 u8 family = info->nfmsg->nfgen_family;
7875 struct nft_flowtable *flowtable;
7876 const struct nft_table *table;
7877 struct net *net = info->net;
7878 struct sk_buff *skb2;
7881 if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
7882 struct netlink_dump_control c = {
7883 .start = nf_tables_dump_flowtable_start,
7884 .dump = nf_tables_dump_flowtable,
7885 .done = nf_tables_dump_flowtable_done,
7886 .module = THIS_MODULE,
7887 .data = (void *)nla,
7890 return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
7893 if (!nla[NFTA_FLOWTABLE_NAME])
7896 table = nft_table_lookup(net, nla[NFTA_FLOWTABLE_TABLE], family,
7899 return PTR_ERR(table);
7901 flowtable = nft_flowtable_lookup(table, nla[NFTA_FLOWTABLE_NAME],
7903 if (IS_ERR(flowtable))
7904 return PTR_ERR(flowtable);
7906 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
7910 err = nf_tables_fill_flowtable_info(skb2, net, NETLINK_CB(skb).portid,
7911 info->nlh->nlmsg_seq,
7912 NFT_MSG_NEWFLOWTABLE, 0, family,
7913 flowtable, &flowtable->hook_list);
7915 goto err_fill_flowtable_info;
7917 return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
7919 err_fill_flowtable_info:
7924 static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
7925 struct nft_flowtable *flowtable,
7926 struct list_head *hook_list,
7929 struct nftables_pernet *nft_net = nft_pernet(ctx->net);
7930 struct sk_buff *skb;
7935 !nfnetlink_has_listeners(ctx->net, NFNLGRP_NFTABLES))
7938 skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
7942 if (ctx->flags & (NLM_F_CREATE | NLM_F_EXCL))
7943 flags |= ctx->flags & (NLM_F_CREATE | NLM_F_EXCL);
7945 err = nf_tables_fill_flowtable_info(skb, ctx->net, ctx->portid,
7946 ctx->seq, event, flags,
7947 ctx->family, flowtable, hook_list);
7953 nft_notify_enqueue(skb, ctx->report, &nft_net->notify_list);
7956 nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
7959 static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
7961 struct nft_hook *hook, *next;
7963 flowtable->data.type->free(&flowtable->data);
7964 list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
7965 flowtable->data.type->setup(&flowtable->data, hook->ops.dev,
7967 list_del_rcu(&hook->list);
7970 kfree(flowtable->name);
7971 module_put(flowtable->data.type->owner);
7975 static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
7976 u32 portid, u32 seq)
7978 struct nftables_pernet *nft_net = nft_pernet(net);
7979 struct nlmsghdr *nlh;
7980 char buf[TASK_COMM_LEN];
7981 int event = nfnl_msg_type(NFNL_SUBSYS_NFTABLES, NFT_MSG_NEWGEN);
7983 nlh = nfnl_msg_put(skb, portid, seq, event, 0, AF_UNSPEC,
7984 NFNETLINK_V0, nft_base_seq(net));
7986 goto nla_put_failure;
7988 if (nla_put_be32(skb, NFTA_GEN_ID, htonl(nft_net->base_seq)) ||
7989 nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||
7990 nla_put_string(skb, NFTA_GEN_PROC_NAME, get_task_comm(buf, current)))
7991 goto nla_put_failure;
7993 nlmsg_end(skb, nlh);
7997 nlmsg_trim(skb, nlh);
8001 static void nft_flowtable_event(unsigned long event, struct net_device *dev,
8002 struct nft_flowtable *flowtable)
8004 struct nft_hook *hook;
8006 list_for_each_entry(hook, &flowtable->hook_list, list) {
8007 if (hook->ops.dev != dev)
8010 /* flow_offload_netdev_event() cleans up entries for us. */
8011 nft_unregister_flowtable_hook(dev_net(dev), flowtable, hook);
8012 list_del_rcu(&hook->list);
8013 kfree_rcu(hook, rcu);
8018 static int nf_tables_flowtable_event(struct notifier_block *this,
8019 unsigned long event, void *ptr)
8021 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
8022 struct nft_flowtable *flowtable;
8023 struct nftables_pernet *nft_net;
8024 struct nft_table *table;
8027 if (event != NETDEV_UNREGISTER)
8031 nft_net = nft_pernet(net);
8032 mutex_lock(&nft_net->commit_mutex);
8033 list_for_each_entry(table, &nft_net->tables, list) {
8034 list_for_each_entry(flowtable, &table->flowtables, list) {
8035 nft_flowtable_event(event, dev, flowtable);
8038 mutex_unlock(&nft_net->commit_mutex);
8043 static struct notifier_block nf_tables_flowtable_notifier = {
8044 .notifier_call = nf_tables_flowtable_event,
8047 static void nf_tables_gen_notify(struct net *net, struct sk_buff *skb,
8050 struct nlmsghdr *nlh = nlmsg_hdr(skb);
8051 struct sk_buff *skb2;
8054 if (!nlmsg_report(nlh) &&
8055 !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
8058 skb2 = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
8062 err = nf_tables_fill_gen_info(skb2, net, NETLINK_CB(skb).portid,
8069 nfnetlink_send(skb2, net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8070 nlmsg_report(nlh), GFP_KERNEL);
8073 nfnetlink_set_err(net, NETLINK_CB(skb).portid, NFNLGRP_NFTABLES,
8077 static int nf_tables_getgen(struct sk_buff *skb, const struct nfnl_info *info,
8078 const struct nlattr * const nla[])
8080 struct sk_buff *skb2;
8083 skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
8087 err = nf_tables_fill_gen_info(skb2, info->net, NETLINK_CB(skb).portid,
8088 info->nlh->nlmsg_seq);
8090 goto err_fill_gen_info;
8092 return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
8099 static const struct nfnl_callback nf_tables_cb[NFT_MSG_MAX] = {
8100 [NFT_MSG_NEWTABLE] = {
8101 .call = nf_tables_newtable,
8102 .type = NFNL_CB_BATCH,
8103 .attr_count = NFTA_TABLE_MAX,
8104 .policy = nft_table_policy,
8106 [NFT_MSG_GETTABLE] = {
8107 .call = nf_tables_gettable,
8108 .type = NFNL_CB_RCU,
8109 .attr_count = NFTA_TABLE_MAX,
8110 .policy = nft_table_policy,
8112 [NFT_MSG_DELTABLE] = {
8113 .call = nf_tables_deltable,
8114 .type = NFNL_CB_BATCH,
8115 .attr_count = NFTA_TABLE_MAX,
8116 .policy = nft_table_policy,
8118 [NFT_MSG_NEWCHAIN] = {
8119 .call = nf_tables_newchain,
8120 .type = NFNL_CB_BATCH,
8121 .attr_count = NFTA_CHAIN_MAX,
8122 .policy = nft_chain_policy,
8124 [NFT_MSG_GETCHAIN] = {
8125 .call = nf_tables_getchain,
8126 .type = NFNL_CB_RCU,
8127 .attr_count = NFTA_CHAIN_MAX,
8128 .policy = nft_chain_policy,
8130 [NFT_MSG_DELCHAIN] = {
8131 .call = nf_tables_delchain,
8132 .type = NFNL_CB_BATCH,
8133 .attr_count = NFTA_CHAIN_MAX,
8134 .policy = nft_chain_policy,
8136 [NFT_MSG_NEWRULE] = {
8137 .call = nf_tables_newrule,
8138 .type = NFNL_CB_BATCH,
8139 .attr_count = NFTA_RULE_MAX,
8140 .policy = nft_rule_policy,
8142 [NFT_MSG_GETRULE] = {
8143 .call = nf_tables_getrule,
8144 .type = NFNL_CB_RCU,
8145 .attr_count = NFTA_RULE_MAX,
8146 .policy = nft_rule_policy,
8148 [NFT_MSG_DELRULE] = {
8149 .call = nf_tables_delrule,
8150 .type = NFNL_CB_BATCH,
8151 .attr_count = NFTA_RULE_MAX,
8152 .policy = nft_rule_policy,
8154 [NFT_MSG_NEWSET] = {
8155 .call = nf_tables_newset,
8156 .type = NFNL_CB_BATCH,
8157 .attr_count = NFTA_SET_MAX,
8158 .policy = nft_set_policy,
8160 [NFT_MSG_GETSET] = {
8161 .call = nf_tables_getset,
8162 .type = NFNL_CB_RCU,
8163 .attr_count = NFTA_SET_MAX,
8164 .policy = nft_set_policy,
8166 [NFT_MSG_DELSET] = {
8167 .call = nf_tables_delset,
8168 .type = NFNL_CB_BATCH,
8169 .attr_count = NFTA_SET_MAX,
8170 .policy = nft_set_policy,
8172 [NFT_MSG_NEWSETELEM] = {
8173 .call = nf_tables_newsetelem,
8174 .type = NFNL_CB_BATCH,
8175 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8176 .policy = nft_set_elem_list_policy,
8178 [NFT_MSG_GETSETELEM] = {
8179 .call = nf_tables_getsetelem,
8180 .type = NFNL_CB_RCU,
8181 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8182 .policy = nft_set_elem_list_policy,
8184 [NFT_MSG_DELSETELEM] = {
8185 .call = nf_tables_delsetelem,
8186 .type = NFNL_CB_BATCH,
8187 .attr_count = NFTA_SET_ELEM_LIST_MAX,
8188 .policy = nft_set_elem_list_policy,
8190 [NFT_MSG_GETGEN] = {
8191 .call = nf_tables_getgen,
8192 .type = NFNL_CB_RCU,
8194 [NFT_MSG_NEWOBJ] = {
8195 .call = nf_tables_newobj,
8196 .type = NFNL_CB_BATCH,
8197 .attr_count = NFTA_OBJ_MAX,
8198 .policy = nft_obj_policy,
8200 [NFT_MSG_GETOBJ] = {
8201 .call = nf_tables_getobj,
8202 .type = NFNL_CB_RCU,
8203 .attr_count = NFTA_OBJ_MAX,
8204 .policy = nft_obj_policy,
8206 [NFT_MSG_DELOBJ] = {
8207 .call = nf_tables_delobj,
8208 .type = NFNL_CB_BATCH,
8209 .attr_count = NFTA_OBJ_MAX,
8210 .policy = nft_obj_policy,
8212 [NFT_MSG_GETOBJ_RESET] = {
8213 .call = nf_tables_getobj,
8214 .type = NFNL_CB_RCU,
8215 .attr_count = NFTA_OBJ_MAX,
8216 .policy = nft_obj_policy,
8218 [NFT_MSG_NEWFLOWTABLE] = {
8219 .call = nf_tables_newflowtable,
8220 .type = NFNL_CB_BATCH,
8221 .attr_count = NFTA_FLOWTABLE_MAX,
8222 .policy = nft_flowtable_policy,
8224 [NFT_MSG_GETFLOWTABLE] = {
8225 .call = nf_tables_getflowtable,
8226 .type = NFNL_CB_RCU,
8227 .attr_count = NFTA_FLOWTABLE_MAX,
8228 .policy = nft_flowtable_policy,
8230 [NFT_MSG_DELFLOWTABLE] = {
8231 .call = nf_tables_delflowtable,
8232 .type = NFNL_CB_BATCH,
8233 .attr_count = NFTA_FLOWTABLE_MAX,
8234 .policy = nft_flowtable_policy,
8238 static int nf_tables_validate(struct net *net)
8240 struct nftables_pernet *nft_net = nft_pernet(net);
8241 struct nft_table *table;
8243 switch (nft_net->validate_state) {
8244 case NFT_VALIDATE_SKIP:
8246 case NFT_VALIDATE_NEED:
8247 nft_validate_state_update(net, NFT_VALIDATE_DO);
8249 case NFT_VALIDATE_DO:
8250 list_for_each_entry(table, &nft_net->tables, list) {
8251 if (nft_table_validate(net, table) < 0)
8260 /* a drop policy has to be deferred until all rules have been activated,
8261 * otherwise a large ruleset that contains a drop-policy base chain will
8262 * cause all packets to get dropped until the full transaction has been
8265 * We defer the drop policy until the transaction has been finalized.
8267 static void nft_chain_commit_drop_policy(struct nft_trans *trans)
8269 struct nft_base_chain *basechain;
8271 if (nft_trans_chain_policy(trans) != NF_DROP)
8274 if (!nft_is_base_chain(trans->ctx.chain))
8277 basechain = nft_base_chain(trans->ctx.chain);
8278 basechain->policy = NF_DROP;
8281 static void nft_chain_commit_update(struct nft_trans *trans)
8283 struct nft_base_chain *basechain;
8285 if (nft_trans_chain_name(trans)) {
8286 rhltable_remove(&trans->ctx.table->chains_ht,
8287 &trans->ctx.chain->rhlhead,
8288 nft_chain_ht_params);
8289 swap(trans->ctx.chain->name, nft_trans_chain_name(trans));
8290 rhltable_insert_key(&trans->ctx.table->chains_ht,
8291 trans->ctx.chain->name,
8292 &trans->ctx.chain->rhlhead,
8293 nft_chain_ht_params);
8296 if (!nft_is_base_chain(trans->ctx.chain))
8299 nft_chain_stats_replace(trans);
8301 basechain = nft_base_chain(trans->ctx.chain);
8303 switch (nft_trans_chain_policy(trans)) {
8306 basechain->policy = nft_trans_chain_policy(trans);
8311 static void nft_obj_commit_update(struct nft_trans *trans)
8313 struct nft_object *newobj;
8314 struct nft_object *obj;
8316 obj = nft_trans_obj(trans);
8317 newobj = nft_trans_obj_newobj(trans);
8319 if (obj->ops->update)
8320 obj->ops->update(obj, newobj);
8322 nft_obj_destroy(&trans->ctx, newobj);
8325 static void nft_commit_release(struct nft_trans *trans)
8327 switch (trans->msg_type) {
8328 case NFT_MSG_DELTABLE:
8329 nf_tables_table_destroy(&trans->ctx);
8331 case NFT_MSG_NEWCHAIN:
8332 free_percpu(nft_trans_chain_stats(trans));
8333 kfree(nft_trans_chain_name(trans));
8335 case NFT_MSG_DELCHAIN:
8336 nf_tables_chain_destroy(&trans->ctx);
8338 case NFT_MSG_DELRULE:
8339 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8340 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8342 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8344 case NFT_MSG_DELSET:
8345 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8347 case NFT_MSG_DELSETELEM:
8348 nf_tables_set_elem_destroy(&trans->ctx,
8349 nft_trans_elem_set(trans),
8350 nft_trans_elem(trans).priv);
8352 case NFT_MSG_DELOBJ:
8353 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8355 case NFT_MSG_DELFLOWTABLE:
8356 if (nft_trans_flowtable_update(trans))
8357 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8359 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8364 put_net(trans->ctx.net);
8369 static void nf_tables_trans_destroy_work(struct work_struct *w)
8371 struct nft_trans *trans, *next;
8374 spin_lock(&nf_tables_destroy_list_lock);
8375 list_splice_init(&nf_tables_destroy_list, &head);
8376 spin_unlock(&nf_tables_destroy_list_lock);
8378 if (list_empty(&head))
8383 list_for_each_entry_safe(trans, next, &head, list) {
8384 list_del(&trans->list);
8385 nft_commit_release(trans);
8389 void nf_tables_trans_destroy_flush_work(void)
8391 flush_work(&trans_destroy_work);
8393 EXPORT_SYMBOL_GPL(nf_tables_trans_destroy_flush_work);
8395 static bool nft_expr_reduce(struct nft_regs_track *track,
8396 const struct nft_expr *expr)
8401 static int nf_tables_commit_chain_prepare(struct net *net, struct nft_chain *chain)
8403 const struct nft_expr *expr, *last;
8404 struct nft_regs_track track = {};
8405 unsigned int size, data_size;
8406 void *data, *data_boundary;
8407 struct nft_rule_dp *prule;
8408 struct nft_rule *rule;
8410 /* already handled or inactive chain? */
8411 if (chain->blob_next || !nft_is_active_next(net, chain))
8415 list_for_each_entry(rule, &chain->rules, list) {
8416 if (nft_is_active_next(net, rule)) {
8417 data_size += sizeof(*prule) + rule->dlen;
8418 if (data_size > INT_MAX)
8422 data_size += offsetof(struct nft_rule_dp, data); /* last rule */
8424 chain->blob_next = nf_tables_chain_alloc_rules(data_size);
8425 if (!chain->blob_next)
8428 data = (void *)chain->blob_next->data;
8429 data_boundary = data + data_size;
8432 list_for_each_entry(rule, &chain->rules, list) {
8433 if (!nft_is_active_next(net, rule))
8436 prule = (struct nft_rule_dp *)data;
8437 data += offsetof(struct nft_rule_dp, data);
8438 if (WARN_ON_ONCE(data > data_boundary))
8442 track.last = nft_expr_last(rule);
8443 nft_rule_for_each_expr(expr, last, rule) {
8446 if (nft_expr_reduce(&track, expr)) {
8451 if (WARN_ON_ONCE(data + expr->ops->size > data_boundary))
8454 memcpy(data + size, expr, expr->ops->size);
8455 size += expr->ops->size;
8457 if (WARN_ON_ONCE(size >= 1 << 12))
8460 prule->handle = rule->handle;
8466 chain->blob_next->size += (unsigned long)(data - (void *)prule);
8469 prule = (struct nft_rule_dp *)data;
8470 data += offsetof(struct nft_rule_dp, data);
8471 if (WARN_ON_ONCE(data > data_boundary))
8474 nft_last_rule(chain->blob_next, prule);
8479 static void nf_tables_commit_chain_prepare_cancel(struct net *net)
8481 struct nftables_pernet *nft_net = nft_pernet(net);
8482 struct nft_trans *trans, *next;
8484 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8485 struct nft_chain *chain = trans->ctx.chain;
8487 if (trans->msg_type == NFT_MSG_NEWRULE ||
8488 trans->msg_type == NFT_MSG_DELRULE) {
8489 kvfree(chain->blob_next);
8490 chain->blob_next = NULL;
8495 static void __nf_tables_commit_chain_free_rules_old(struct rcu_head *h)
8497 struct nft_rules_old *o = container_of(h, struct nft_rules_old, h);
8502 static void nf_tables_commit_chain_free_rules_old(struct nft_rule_blob *blob)
8504 struct nft_rules_old *old;
8506 /* rcu_head is after end marker */
8507 old = (void *)blob + sizeof(*blob) + blob->size;
8510 call_rcu(&old->h, __nf_tables_commit_chain_free_rules_old);
8513 static void nf_tables_commit_chain(struct net *net, struct nft_chain *chain)
8515 struct nft_rule_blob *g0, *g1;
8518 next_genbit = nft_gencursor_next(net);
8520 g0 = rcu_dereference_protected(chain->blob_gen_0,
8521 lockdep_commit_lock_is_held(net));
8522 g1 = rcu_dereference_protected(chain->blob_gen_1,
8523 lockdep_commit_lock_is_held(net));
8525 /* No changes to this chain? */
8526 if (chain->blob_next == NULL) {
8527 /* chain had no change in last or next generation */
8531 * chain had no change in this generation; make sure next
8532 * one uses same rules as current generation.
8535 rcu_assign_pointer(chain->blob_gen_1, g0);
8536 nf_tables_commit_chain_free_rules_old(g1);
8538 rcu_assign_pointer(chain->blob_gen_0, g1);
8539 nf_tables_commit_chain_free_rules_old(g0);
8546 rcu_assign_pointer(chain->blob_gen_1, chain->blob_next);
8548 rcu_assign_pointer(chain->blob_gen_0, chain->blob_next);
8550 chain->blob_next = NULL;
8556 nf_tables_commit_chain_free_rules_old(g1);
8558 nf_tables_commit_chain_free_rules_old(g0);
8561 static void nft_obj_del(struct nft_object *obj)
8563 rhltable_remove(&nft_objname_ht, &obj->rhlhead, nft_objname_ht_params);
8564 list_del_rcu(&obj->list);
8567 void nft_chain_del(struct nft_chain *chain)
8569 struct nft_table *table = chain->table;
8571 WARN_ON_ONCE(rhltable_remove(&table->chains_ht, &chain->rhlhead,
8572 nft_chain_ht_params));
8573 list_del_rcu(&chain->list);
8576 static void nf_tables_module_autoload_cleanup(struct net *net)
8578 struct nftables_pernet *nft_net = nft_pernet(net);
8579 struct nft_module_request *req, *next;
8581 WARN_ON_ONCE(!list_empty(&nft_net->commit_list));
8582 list_for_each_entry_safe(req, next, &nft_net->module_list, list) {
8583 WARN_ON_ONCE(!req->done);
8584 list_del(&req->list);
8589 static void nf_tables_commit_release(struct net *net)
8591 struct nftables_pernet *nft_net = nft_pernet(net);
8592 struct nft_trans *trans;
8594 /* all side effects have to be made visible.
8595 * For example, if a chain named 'foo' has been deleted, a
8596 * new transaction must not find it anymore.
8598 * Memory reclaim happens asynchronously from work queue
8599 * to prevent expensive synchronize_rcu() in commit phase.
8601 if (list_empty(&nft_net->commit_list)) {
8602 nf_tables_module_autoload_cleanup(net);
8603 mutex_unlock(&nft_net->commit_mutex);
8607 trans = list_last_entry(&nft_net->commit_list,
8608 struct nft_trans, list);
8609 get_net(trans->ctx.net);
8610 WARN_ON_ONCE(trans->put_net);
8612 trans->put_net = true;
8613 spin_lock(&nf_tables_destroy_list_lock);
8614 list_splice_tail_init(&nft_net->commit_list, &nf_tables_destroy_list);
8615 spin_unlock(&nf_tables_destroy_list_lock);
8617 nf_tables_module_autoload_cleanup(net);
8618 schedule_work(&trans_destroy_work);
8620 mutex_unlock(&nft_net->commit_mutex);
8623 static void nft_commit_notify(struct net *net, u32 portid)
8625 struct nftables_pernet *nft_net = nft_pernet(net);
8626 struct sk_buff *batch_skb = NULL, *nskb, *skb;
8627 unsigned char *data;
8630 list_for_each_entry_safe(skb, nskb, &nft_net->notify_list, list) {
8634 len = NLMSG_GOODSIZE - skb->len;
8635 list_del(&skb->list);
8639 if (len > 0 && NFT_CB(skb).report == NFT_CB(batch_skb).report) {
8640 data = skb_put(batch_skb, skb->len);
8641 memcpy(data, skb->data, skb->len);
8642 list_del(&skb->list);
8646 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8647 NFT_CB(batch_skb).report, GFP_KERNEL);
8652 nfnetlink_send(batch_skb, net, portid, NFNLGRP_NFTABLES,
8653 NFT_CB(batch_skb).report, GFP_KERNEL);
8656 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
8659 static int nf_tables_commit_audit_alloc(struct list_head *adl,
8660 struct nft_table *table)
8662 struct nft_audit_data *adp;
8664 list_for_each_entry(adp, adl, list) {
8665 if (adp->table == table)
8668 adp = kzalloc(sizeof(*adp), GFP_KERNEL);
8672 list_add(&adp->list, adl);
8676 static void nf_tables_commit_audit_free(struct list_head *adl)
8678 struct nft_audit_data *adp, *adn;
8680 list_for_each_entry_safe(adp, adn, adl, list) {
8681 list_del(&adp->list);
8686 static void nf_tables_commit_audit_collect(struct list_head *adl,
8687 struct nft_table *table, u32 op)
8689 struct nft_audit_data *adp;
8691 list_for_each_entry(adp, adl, list) {
8692 if (adp->table == table)
8695 WARN_ONCE(1, "table=%s not expected in commit list", table->name);
8699 if (!adp->op || adp->op > op)
8703 #define AUNFTABLENAMELEN (NFT_TABLE_MAXNAMELEN + 22)
8705 static void nf_tables_commit_audit_log(struct list_head *adl, u32 generation)
8707 struct nft_audit_data *adp, *adn;
8708 char aubuf[AUNFTABLENAMELEN];
8710 list_for_each_entry_safe(adp, adn, adl, list) {
8711 snprintf(aubuf, AUNFTABLENAMELEN, "%s:%u", adp->table->name,
8713 audit_log_nfcfg(aubuf, adp->table->family, adp->entries,
8714 nft2audit_op[adp->op], GFP_KERNEL);
8715 list_del(&adp->list);
8720 static int nf_tables_commit(struct net *net, struct sk_buff *skb)
8722 struct nftables_pernet *nft_net = nft_pernet(net);
8723 struct nft_trans *trans, *next;
8724 struct nft_trans_elem *te;
8725 struct nft_chain *chain;
8726 struct nft_table *table;
8730 if (list_empty(&nft_net->commit_list)) {
8731 mutex_unlock(&nft_net->commit_mutex);
8735 /* 0. Validate ruleset, otherwise roll back for error reporting. */
8736 if (nf_tables_validate(net) < 0)
8739 err = nft_flow_rule_offload_commit(net);
8743 /* 1. Allocate space for next generation rules_gen_X[] */
8744 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8747 ret = nf_tables_commit_audit_alloc(&adl, trans->ctx.table);
8749 nf_tables_commit_chain_prepare_cancel(net);
8750 nf_tables_commit_audit_free(&adl);
8753 if (trans->msg_type == NFT_MSG_NEWRULE ||
8754 trans->msg_type == NFT_MSG_DELRULE) {
8755 chain = trans->ctx.chain;
8757 ret = nf_tables_commit_chain_prepare(net, chain);
8759 nf_tables_commit_chain_prepare_cancel(net);
8760 nf_tables_commit_audit_free(&adl);
8766 /* step 2. Make rules_gen_X visible to packet path */
8767 list_for_each_entry(table, &nft_net->tables, list) {
8768 list_for_each_entry(chain, &table->chains, list)
8769 nf_tables_commit_chain(net, chain);
8773 * Bump generation counter, invalidate any dump in progress.
8774 * Cannot fail after this point.
8776 while (++nft_net->base_seq == 0)
8779 /* step 3. Start new generation, rules_gen_X now in use. */
8780 net->nft.gencursor = nft_gencursor_next(net);
8782 list_for_each_entry_safe(trans, next, &nft_net->commit_list, list) {
8783 nf_tables_commit_audit_collect(&adl, trans->ctx.table,
8785 switch (trans->msg_type) {
8786 case NFT_MSG_NEWTABLE:
8787 if (nft_trans_table_update(trans)) {
8788 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
8789 nft_trans_destroy(trans);
8792 if (trans->ctx.table->flags & NFT_TABLE_F_DORMANT)
8793 nf_tables_table_disable(net, trans->ctx.table);
8795 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
8797 nft_clear(net, trans->ctx.table);
8799 nf_tables_table_notify(&trans->ctx, NFT_MSG_NEWTABLE);
8800 nft_trans_destroy(trans);
8802 case NFT_MSG_DELTABLE:
8803 list_del_rcu(&trans->ctx.table->list);
8804 nf_tables_table_notify(&trans->ctx, NFT_MSG_DELTABLE);
8806 case NFT_MSG_NEWCHAIN:
8807 if (nft_trans_chain_update(trans)) {
8808 nft_chain_commit_update(trans);
8809 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8810 /* trans destroyed after rcu grace period */
8812 nft_chain_commit_drop_policy(trans);
8813 nft_clear(net, trans->ctx.chain);
8814 nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
8815 nft_trans_destroy(trans);
8818 case NFT_MSG_DELCHAIN:
8819 nft_chain_del(trans->ctx.chain);
8820 nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
8821 nf_tables_unregister_hook(trans->ctx.net,
8825 case NFT_MSG_NEWRULE:
8826 nft_clear(trans->ctx.net, nft_trans_rule(trans));
8827 nf_tables_rule_notify(&trans->ctx,
8828 nft_trans_rule(trans),
8830 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
8831 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
8833 nft_trans_destroy(trans);
8835 case NFT_MSG_DELRULE:
8836 list_del_rcu(&nft_trans_rule(trans)->list);
8837 nf_tables_rule_notify(&trans->ctx,
8838 nft_trans_rule(trans),
8840 nft_rule_expr_deactivate(&trans->ctx,
8841 nft_trans_rule(trans),
8844 case NFT_MSG_NEWSET:
8845 nft_clear(net, nft_trans_set(trans));
8846 /* This avoids hitting -EBUSY when deleting the table
8847 * from the transaction.
8849 if (nft_set_is_anonymous(nft_trans_set(trans)) &&
8850 !list_empty(&nft_trans_set(trans)->bindings))
8851 trans->ctx.table->use--;
8853 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8854 NFT_MSG_NEWSET, GFP_KERNEL);
8855 nft_trans_destroy(trans);
8857 case NFT_MSG_DELSET:
8858 list_del_rcu(&nft_trans_set(trans)->list);
8859 nf_tables_set_notify(&trans->ctx, nft_trans_set(trans),
8860 NFT_MSG_DELSET, GFP_KERNEL);
8862 case NFT_MSG_NEWSETELEM:
8863 te = (struct nft_trans_elem *)trans->data;
8865 nft_setelem_activate(net, te->set, &te->elem);
8866 nf_tables_setelem_notify(&trans->ctx, te->set,
8868 NFT_MSG_NEWSETELEM);
8869 nft_trans_destroy(trans);
8871 case NFT_MSG_DELSETELEM:
8872 te = (struct nft_trans_elem *)trans->data;
8874 nf_tables_setelem_notify(&trans->ctx, te->set,
8876 NFT_MSG_DELSETELEM);
8877 nft_setelem_remove(net, te->set, &te->elem);
8878 if (!nft_setelem_is_catchall(te->set, &te->elem)) {
8879 atomic_dec(&te->set->nelems);
8883 case NFT_MSG_NEWOBJ:
8884 if (nft_trans_obj_update(trans)) {
8885 nft_obj_commit_update(trans);
8886 nf_tables_obj_notify(&trans->ctx,
8887 nft_trans_obj(trans),
8890 nft_clear(net, nft_trans_obj(trans));
8891 nf_tables_obj_notify(&trans->ctx,
8892 nft_trans_obj(trans),
8894 nft_trans_destroy(trans);
8897 case NFT_MSG_DELOBJ:
8898 nft_obj_del(nft_trans_obj(trans));
8899 nf_tables_obj_notify(&trans->ctx, nft_trans_obj(trans),
8902 case NFT_MSG_NEWFLOWTABLE:
8903 if (nft_trans_flowtable_update(trans)) {
8904 nft_trans_flowtable(trans)->data.flags =
8905 nft_trans_flowtable_flags(trans);
8906 nf_tables_flowtable_notify(&trans->ctx,
8907 nft_trans_flowtable(trans),
8908 &nft_trans_flowtable_hooks(trans),
8909 NFT_MSG_NEWFLOWTABLE);
8910 list_splice(&nft_trans_flowtable_hooks(trans),
8911 &nft_trans_flowtable(trans)->hook_list);
8913 nft_clear(net, nft_trans_flowtable(trans));
8914 nf_tables_flowtable_notify(&trans->ctx,
8915 nft_trans_flowtable(trans),
8916 &nft_trans_flowtable(trans)->hook_list,
8917 NFT_MSG_NEWFLOWTABLE);
8919 nft_trans_destroy(trans);
8921 case NFT_MSG_DELFLOWTABLE:
8922 if (nft_trans_flowtable_update(trans)) {
8923 nf_tables_flowtable_notify(&trans->ctx,
8924 nft_trans_flowtable(trans),
8925 &nft_trans_flowtable_hooks(trans),
8926 NFT_MSG_DELFLOWTABLE);
8927 nft_unregister_flowtable_net_hooks(net,
8928 &nft_trans_flowtable_hooks(trans));
8930 list_del_rcu(&nft_trans_flowtable(trans)->list);
8931 nf_tables_flowtable_notify(&trans->ctx,
8932 nft_trans_flowtable(trans),
8933 &nft_trans_flowtable(trans)->hook_list,
8934 NFT_MSG_DELFLOWTABLE);
8935 nft_unregister_flowtable_net_hooks(net,
8936 &nft_trans_flowtable(trans)->hook_list);
8942 nft_commit_notify(net, NETLINK_CB(skb).portid);
8943 nf_tables_gen_notify(net, skb, NFT_MSG_NEWGEN);
8944 nf_tables_commit_audit_log(&adl, nft_net->base_seq);
8945 nf_tables_commit_release(net);
8950 static void nf_tables_module_autoload(struct net *net)
8952 struct nftables_pernet *nft_net = nft_pernet(net);
8953 struct nft_module_request *req, *next;
8954 LIST_HEAD(module_list);
8956 list_splice_init(&nft_net->module_list, &module_list);
8957 mutex_unlock(&nft_net->commit_mutex);
8958 list_for_each_entry_safe(req, next, &module_list, list) {
8959 request_module("%s", req->module);
8962 mutex_lock(&nft_net->commit_mutex);
8963 list_splice(&module_list, &nft_net->module_list);
8966 static void nf_tables_abort_release(struct nft_trans *trans)
8968 switch (trans->msg_type) {
8969 case NFT_MSG_NEWTABLE:
8970 nf_tables_table_destroy(&trans->ctx);
8972 case NFT_MSG_NEWCHAIN:
8973 nf_tables_chain_destroy(&trans->ctx);
8975 case NFT_MSG_NEWRULE:
8976 nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
8978 case NFT_MSG_NEWSET:
8979 nft_set_destroy(&trans->ctx, nft_trans_set(trans));
8981 case NFT_MSG_NEWSETELEM:
8982 nft_set_elem_destroy(nft_trans_elem_set(trans),
8983 nft_trans_elem(trans).priv, true);
8985 case NFT_MSG_NEWOBJ:
8986 nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
8988 case NFT_MSG_NEWFLOWTABLE:
8989 if (nft_trans_flowtable_update(trans))
8990 nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
8992 nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
8998 static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
9000 struct nftables_pernet *nft_net = nft_pernet(net);
9001 struct nft_trans *trans, *next;
9002 struct nft_trans_elem *te;
9004 if (action == NFNL_ABORT_VALIDATE &&
9005 nf_tables_validate(net) < 0)
9008 list_for_each_entry_safe_reverse(trans, next, &nft_net->commit_list,
9010 switch (trans->msg_type) {
9011 case NFT_MSG_NEWTABLE:
9012 if (nft_trans_table_update(trans)) {
9013 if (!(trans->ctx.table->flags & __NFT_TABLE_F_UPDATE)) {
9014 nft_trans_destroy(trans);
9017 if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_DORMANT) {
9018 nf_tables_table_disable(net, trans->ctx.table);
9019 trans->ctx.table->flags |= NFT_TABLE_F_DORMANT;
9020 } else if (trans->ctx.table->flags & __NFT_TABLE_F_WAS_AWAKEN) {
9021 trans->ctx.table->flags &= ~NFT_TABLE_F_DORMANT;
9023 trans->ctx.table->flags &= ~__NFT_TABLE_F_UPDATE;
9024 nft_trans_destroy(trans);
9026 list_del_rcu(&trans->ctx.table->list);
9029 case NFT_MSG_DELTABLE:
9030 nft_clear(trans->ctx.net, trans->ctx.table);
9031 nft_trans_destroy(trans);
9033 case NFT_MSG_NEWCHAIN:
9034 if (nft_trans_chain_update(trans)) {
9035 free_percpu(nft_trans_chain_stats(trans));
9036 kfree(nft_trans_chain_name(trans));
9037 nft_trans_destroy(trans);
9039 if (nft_chain_is_bound(trans->ctx.chain)) {
9040 nft_trans_destroy(trans);
9043 trans->ctx.table->use--;
9044 nft_chain_del(trans->ctx.chain);
9045 nf_tables_unregister_hook(trans->ctx.net,
9050 case NFT_MSG_DELCHAIN:
9051 trans->ctx.table->use++;
9052 nft_clear(trans->ctx.net, trans->ctx.chain);
9053 nft_trans_destroy(trans);
9055 case NFT_MSG_NEWRULE:
9056 trans->ctx.chain->use--;
9057 list_del_rcu(&nft_trans_rule(trans)->list);
9058 nft_rule_expr_deactivate(&trans->ctx,
9059 nft_trans_rule(trans),
9061 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9062 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9064 case NFT_MSG_DELRULE:
9065 trans->ctx.chain->use++;
9066 nft_clear(trans->ctx.net, nft_trans_rule(trans));
9067 nft_rule_expr_activate(&trans->ctx, nft_trans_rule(trans));
9068 if (trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD)
9069 nft_flow_rule_destroy(nft_trans_flow_rule(trans));
9071 nft_trans_destroy(trans);
9073 case NFT_MSG_NEWSET:
9074 trans->ctx.table->use--;
9075 if (nft_trans_set_bound(trans)) {
9076 nft_trans_destroy(trans);
9079 list_del_rcu(&nft_trans_set(trans)->list);
9081 case NFT_MSG_DELSET:
9082 trans->ctx.table->use++;
9083 nft_clear(trans->ctx.net, nft_trans_set(trans));
9084 nft_trans_destroy(trans);
9086 case NFT_MSG_NEWSETELEM:
9087 if (nft_trans_elem_set_bound(trans)) {
9088 nft_trans_destroy(trans);
9091 te = (struct nft_trans_elem *)trans->data;
9092 nft_setelem_remove(net, te->set, &te->elem);
9093 if (!nft_setelem_is_catchall(te->set, &te->elem))
9094 atomic_dec(&te->set->nelems);
9096 case NFT_MSG_DELSETELEM:
9097 te = (struct nft_trans_elem *)trans->data;
9099 nft_setelem_data_activate(net, te->set, &te->elem);
9100 nft_setelem_activate(net, te->set, &te->elem);
9101 if (!nft_setelem_is_catchall(te->set, &te->elem))
9104 nft_trans_destroy(trans);
9106 case NFT_MSG_NEWOBJ:
9107 if (nft_trans_obj_update(trans)) {
9108 nft_obj_destroy(&trans->ctx, nft_trans_obj_newobj(trans));
9109 nft_trans_destroy(trans);
9111 trans->ctx.table->use--;
9112 nft_obj_del(nft_trans_obj(trans));
9115 case NFT_MSG_DELOBJ:
9116 trans->ctx.table->use++;
9117 nft_clear(trans->ctx.net, nft_trans_obj(trans));
9118 nft_trans_destroy(trans);
9120 case NFT_MSG_NEWFLOWTABLE:
9121 if (nft_trans_flowtable_update(trans)) {
9122 nft_unregister_flowtable_net_hooks(net,
9123 &nft_trans_flowtable_hooks(trans));
9125 trans->ctx.table->use--;
9126 list_del_rcu(&nft_trans_flowtable(trans)->list);
9127 nft_unregister_flowtable_net_hooks(net,
9128 &nft_trans_flowtable(trans)->hook_list);
9131 case NFT_MSG_DELFLOWTABLE:
9132 if (nft_trans_flowtable_update(trans)) {
9133 list_splice(&nft_trans_flowtable_hooks(trans),
9134 &nft_trans_flowtable(trans)->hook_list);
9136 trans->ctx.table->use++;
9137 nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
9139 nft_trans_destroy(trans);
9146 list_for_each_entry_safe_reverse(trans, next,
9147 &nft_net->commit_list, list) {
9148 list_del(&trans->list);
9149 nf_tables_abort_release(trans);
9152 if (action == NFNL_ABORT_AUTOLOAD)
9153 nf_tables_module_autoload(net);
9155 nf_tables_module_autoload_cleanup(net);
9160 static void nf_tables_cleanup(struct net *net)
9162 nft_validate_state_update(net, NFT_VALIDATE_SKIP);
9165 static int nf_tables_abort(struct net *net, struct sk_buff *skb,
9166 enum nfnl_abort_action action)
9168 struct nftables_pernet *nft_net = nft_pernet(net);
9169 int ret = __nf_tables_abort(net, action);
9171 mutex_unlock(&nft_net->commit_mutex);
9176 static bool nf_tables_valid_genid(struct net *net, u32 genid)
9178 struct nftables_pernet *nft_net = nft_pernet(net);
9181 mutex_lock(&nft_net->commit_mutex);
9183 genid_ok = genid == 0 || nft_net->base_seq == genid;
9185 mutex_unlock(&nft_net->commit_mutex);
9187 /* else, commit mutex has to be released by commit or abort function */
9191 static const struct nfnetlink_subsystem nf_tables_subsys = {
9192 .name = "nf_tables",
9193 .subsys_id = NFNL_SUBSYS_NFTABLES,
9194 .cb_count = NFT_MSG_MAX,
9196 .commit = nf_tables_commit,
9197 .abort = nf_tables_abort,
9198 .cleanup = nf_tables_cleanup,
9199 .valid_genid = nf_tables_valid_genid,
9200 .owner = THIS_MODULE,
9203 int nft_chain_validate_dependency(const struct nft_chain *chain,
9204 enum nft_chain_types type)
9206 const struct nft_base_chain *basechain;
9208 if (nft_is_base_chain(chain)) {
9209 basechain = nft_base_chain(chain);
9210 if (basechain->type->type != type)
9215 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency);
9217 int nft_chain_validate_hooks(const struct nft_chain *chain,
9218 unsigned int hook_flags)
9220 struct nft_base_chain *basechain;
9222 if (nft_is_base_chain(chain)) {
9223 basechain = nft_base_chain(chain);
9225 if ((1 << basechain->ops.hooknum) & hook_flags)
9233 EXPORT_SYMBOL_GPL(nft_chain_validate_hooks);
9236 * Loop detection - walk through the ruleset beginning at the destination chain
9237 * of a new jump until either the source chain is reached (loop) or all
9238 * reachable chains have been traversed.
9240 * The loop check is performed whenever a new jump verdict is added to an
9241 * expression or verdict map or a verdict map is bound to a new chain.
9244 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9245 const struct nft_chain *chain);
9247 static int nft_check_loops(const struct nft_ctx *ctx,
9248 const struct nft_set_ext *ext)
9250 const struct nft_data *data;
9253 data = nft_set_ext_data(ext);
9254 switch (data->verdict.code) {
9257 ret = nf_tables_check_loops(ctx, data->verdict.chain);
9267 static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx,
9268 struct nft_set *set,
9269 const struct nft_set_iter *iter,
9270 struct nft_set_elem *elem)
9272 const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
9274 if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) &&
9275 *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END)
9278 return nft_check_loops(ctx, ext);
9281 static int nft_set_catchall_loops(const struct nft_ctx *ctx,
9282 struct nft_set *set)
9284 u8 genmask = nft_genmask_next(ctx->net);
9285 struct nft_set_elem_catchall *catchall;
9286 struct nft_set_ext *ext;
9289 list_for_each_entry_rcu(catchall, &set->catchall_list, list) {
9290 ext = nft_set_elem_ext(set, catchall->elem);
9291 if (!nft_set_elem_active(ext, genmask))
9294 ret = nft_check_loops(ctx, ext);
9302 static int nf_tables_check_loops(const struct nft_ctx *ctx,
9303 const struct nft_chain *chain)
9305 const struct nft_rule *rule;
9306 const struct nft_expr *expr, *last;
9307 struct nft_set *set;
9308 struct nft_set_binding *binding;
9309 struct nft_set_iter iter;
9311 if (ctx->chain == chain)
9314 list_for_each_entry(rule, &chain->rules, list) {
9315 nft_rule_for_each_expr(expr, last, rule) {
9316 struct nft_immediate_expr *priv;
9317 const struct nft_data *data;
9320 if (strcmp(expr->ops->type->name, "immediate"))
9323 priv = nft_expr_priv(expr);
9324 if (priv->dreg != NFT_REG_VERDICT)
9328 switch (data->verdict.code) {
9331 err = nf_tables_check_loops(ctx,
9332 data->verdict.chain);
9342 list_for_each_entry(set, &ctx->table->sets, list) {
9343 if (!nft_is_active_next(ctx->net, set))
9345 if (!(set->flags & NFT_SET_MAP) ||
9346 set->dtype != NFT_DATA_VERDICT)
9349 list_for_each_entry(binding, &set->bindings, list) {
9350 if (!(binding->flags & NFT_SET_MAP) ||
9351 binding->chain != chain)
9354 iter.genmask = nft_genmask_next(ctx->net);
9358 iter.fn = nf_tables_loop_check_setelem;
9360 set->ops->walk(ctx, set, &iter);
9362 iter.err = nft_set_catchall_loops(ctx, set);
9373 * nft_parse_u32_check - fetch u32 attribute and check for maximum value
9375 * @attr: netlink attribute to fetch value from
9376 * @max: maximum value to be stored in dest
9377 * @dest: pointer to the variable
9379 * Parse, check and store a given u32 netlink attribute into variable.
9380 * This function returns -ERANGE if the value goes over maximum value.
9381 * Otherwise a 0 is returned and the attribute value is stored in the
9382 * destination variable.
9384 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
9388 val = ntohl(nla_get_be32(attr));
9395 EXPORT_SYMBOL_GPL(nft_parse_u32_check);
9397 static int nft_parse_register(const struct nlattr *attr, u32 *preg)
9401 reg = ntohl(nla_get_be32(attr));
9403 case NFT_REG_VERDICT...NFT_REG_4:
9404 *preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
9406 case NFT_REG32_00...NFT_REG32_15:
9407 *preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
9417 * nft_dump_register - dump a register value to a netlink attribute
9419 * @skb: socket buffer
9420 * @attr: attribute number
9421 * @reg: register number
9423 * Construct a netlink attribute containing the register number. For
9424 * compatibility reasons, register numbers being a multiple of 4 are
9425 * translated to the corresponding 128 bit register numbers.
9427 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg)
9429 if (reg % (NFT_REG_SIZE / NFT_REG32_SIZE) == 0)
9430 reg = reg / (NFT_REG_SIZE / NFT_REG32_SIZE);
9432 reg = reg - NFT_REG_SIZE / NFT_REG32_SIZE + NFT_REG32_00;
9434 return nla_put_be32(skb, attr, htonl(reg));
9436 EXPORT_SYMBOL_GPL(nft_dump_register);
9438 static int nft_validate_register_load(enum nft_registers reg, unsigned int len)
9440 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9444 if (reg * NFT_REG32_SIZE + len > sizeof_field(struct nft_regs, data))
9450 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
9455 err = nft_parse_register(attr, ®);
9459 err = nft_validate_register_load(reg, len);
9466 EXPORT_SYMBOL_GPL(nft_parse_register_load);
9468 static int nft_validate_register_store(const struct nft_ctx *ctx,
9469 enum nft_registers reg,
9470 const struct nft_data *data,
9471 enum nft_data_types type,
9477 case NFT_REG_VERDICT:
9478 if (type != NFT_DATA_VERDICT)
9482 (data->verdict.code == NFT_GOTO ||
9483 data->verdict.code == NFT_JUMP)) {
9484 err = nf_tables_check_loops(ctx, data->verdict.chain);
9491 if (reg < NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE)
9495 if (reg * NFT_REG32_SIZE + len >
9496 sizeof_field(struct nft_regs, data))
9499 if (data != NULL && type != NFT_DATA_VALUE)
9505 int nft_parse_register_store(const struct nft_ctx *ctx,
9506 const struct nlattr *attr, u8 *dreg,
9507 const struct nft_data *data,
9508 enum nft_data_types type, unsigned int len)
9513 err = nft_parse_register(attr, ®);
9517 err = nft_validate_register_store(ctx, reg, data, type, len);
9524 EXPORT_SYMBOL_GPL(nft_parse_register_store);
9526 static const struct nla_policy nft_verdict_policy[NFTA_VERDICT_MAX + 1] = {
9527 [NFTA_VERDICT_CODE] = { .type = NLA_U32 },
9528 [NFTA_VERDICT_CHAIN] = { .type = NLA_STRING,
9529 .len = NFT_CHAIN_MAXNAMELEN - 1 },
9530 [NFTA_VERDICT_CHAIN_ID] = { .type = NLA_U32 },
9533 static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
9534 struct nft_data_desc *desc, const struct nlattr *nla)
9536 u8 genmask = nft_genmask_next(ctx->net);
9537 struct nlattr *tb[NFTA_VERDICT_MAX + 1];
9538 struct nft_chain *chain;
9541 err = nla_parse_nested_deprecated(tb, NFTA_VERDICT_MAX, nla,
9542 nft_verdict_policy, NULL);
9546 if (!tb[NFTA_VERDICT_CODE])
9548 data->verdict.code = ntohl(nla_get_be32(tb[NFTA_VERDICT_CODE]));
9550 switch (data->verdict.code) {
9552 switch (data->verdict.code & NF_VERDICT_MASK) {
9567 if (tb[NFTA_VERDICT_CHAIN]) {
9568 chain = nft_chain_lookup(ctx->net, ctx->table,
9569 tb[NFTA_VERDICT_CHAIN],
9571 } else if (tb[NFTA_VERDICT_CHAIN_ID]) {
9572 chain = nft_chain_lookup_byid(ctx->net,
9573 tb[NFTA_VERDICT_CHAIN_ID]);
9575 return PTR_ERR(chain);
9581 return PTR_ERR(chain);
9582 if (nft_is_base_chain(chain))
9586 data->verdict.chain = chain;
9590 desc->len = sizeof(data->verdict);
9591 desc->type = NFT_DATA_VERDICT;
9595 static void nft_verdict_uninit(const struct nft_data *data)
9597 struct nft_chain *chain;
9598 struct nft_rule *rule;
9600 switch (data->verdict.code) {
9603 chain = data->verdict.chain;
9606 if (!nft_chain_is_bound(chain))
9609 chain->table->use--;
9610 list_for_each_entry(rule, &chain->rules, list)
9613 nft_chain_del(chain);
9618 int nft_verdict_dump(struct sk_buff *skb, int type, const struct nft_verdict *v)
9620 struct nlattr *nest;
9622 nest = nla_nest_start_noflag(skb, type);
9624 goto nla_put_failure;
9626 if (nla_put_be32(skb, NFTA_VERDICT_CODE, htonl(v->code)))
9627 goto nla_put_failure;
9632 if (nla_put_string(skb, NFTA_VERDICT_CHAIN,
9634 goto nla_put_failure;
9636 nla_nest_end(skb, nest);
9643 static int nft_value_init(const struct nft_ctx *ctx,
9644 struct nft_data *data, unsigned int size,
9645 struct nft_data_desc *desc, const struct nlattr *nla)
9655 nla_memcpy(data->data, nla, len);
9656 desc->type = NFT_DATA_VALUE;
9661 static int nft_value_dump(struct sk_buff *skb, const struct nft_data *data,
9664 return nla_put(skb, NFTA_DATA_VALUE, len, data->data);
9667 static const struct nla_policy nft_data_policy[NFTA_DATA_MAX + 1] = {
9668 [NFTA_DATA_VALUE] = { .type = NLA_BINARY },
9669 [NFTA_DATA_VERDICT] = { .type = NLA_NESTED },
9673 * nft_data_init - parse nf_tables data netlink attributes
9675 * @ctx: context of the expression using the data
9676 * @data: destination struct nft_data
9677 * @size: maximum data length
9678 * @desc: data description
9679 * @nla: netlink attribute containing data
9681 * Parse the netlink data attributes and initialize a struct nft_data.
9682 * The type and length of data are returned in the data description.
9684 * The caller can indicate that it only wants to accept data of type
9685 * NFT_DATA_VALUE by passing NULL for the ctx argument.
9687 int nft_data_init(const struct nft_ctx *ctx,
9688 struct nft_data *data, unsigned int size,
9689 struct nft_data_desc *desc, const struct nlattr *nla)
9691 struct nlattr *tb[NFTA_DATA_MAX + 1];
9694 err = nla_parse_nested_deprecated(tb, NFTA_DATA_MAX, nla,
9695 nft_data_policy, NULL);
9699 if (tb[NFTA_DATA_VALUE])
9700 return nft_value_init(ctx, data, size, desc,
9701 tb[NFTA_DATA_VALUE]);
9702 if (tb[NFTA_DATA_VERDICT] && ctx != NULL)
9703 return nft_verdict_init(ctx, data, desc, tb[NFTA_DATA_VERDICT]);
9706 EXPORT_SYMBOL_GPL(nft_data_init);
9709 * nft_data_release - release a nft_data item
9711 * @data: struct nft_data to release
9712 * @type: type of data
9714 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
9715 * all others need to be released by calling this function.
9717 void nft_data_release(const struct nft_data *data, enum nft_data_types type)
9719 if (type < NFT_DATA_VERDICT)
9722 case NFT_DATA_VERDICT:
9723 return nft_verdict_uninit(data);
9728 EXPORT_SYMBOL_GPL(nft_data_release);
9730 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
9731 enum nft_data_types type, unsigned int len)
9733 struct nlattr *nest;
9736 nest = nla_nest_start_noflag(skb, attr);
9741 case NFT_DATA_VALUE:
9742 err = nft_value_dump(skb, data, len);
9744 case NFT_DATA_VERDICT:
9745 err = nft_verdict_dump(skb, NFTA_DATA_VERDICT, &data->verdict);
9752 nla_nest_end(skb, nest);
9755 EXPORT_SYMBOL_GPL(nft_data_dump);
9757 int __nft_release_basechain(struct nft_ctx *ctx)
9759 struct nft_rule *rule, *nr;
9761 if (WARN_ON(!nft_is_base_chain(ctx->chain)))
9764 nf_tables_unregister_hook(ctx->net, ctx->chain->table, ctx->chain);
9765 list_for_each_entry_safe(rule, nr, &ctx->chain->rules, list) {
9766 list_del(&rule->list);
9768 nf_tables_rule_release(ctx, rule);
9770 nft_chain_del(ctx->chain);
9772 nf_tables_chain_destroy(ctx);
9776 EXPORT_SYMBOL_GPL(__nft_release_basechain);
9778 static void __nft_release_hook(struct net *net, struct nft_table *table)
9780 struct nft_flowtable *flowtable;
9781 struct nft_chain *chain;
9783 list_for_each_entry(chain, &table->chains, list)
9784 __nf_tables_unregister_hook(net, table, chain, true);
9785 list_for_each_entry(flowtable, &table->flowtables, list)
9786 __nft_unregister_flowtable_net_hooks(net, &flowtable->hook_list,
9790 static void __nft_release_hooks(struct net *net)
9792 struct nftables_pernet *nft_net = nft_pernet(net);
9793 struct nft_table *table;
9795 list_for_each_entry(table, &nft_net->tables, list) {
9796 if (nft_table_has_owner(table))
9799 __nft_release_hook(net, table);
9803 static void __nft_release_table(struct net *net, struct nft_table *table)
9805 struct nft_flowtable *flowtable, *nf;
9806 struct nft_chain *chain, *nc;
9807 struct nft_object *obj, *ne;
9808 struct nft_rule *rule, *nr;
9809 struct nft_set *set, *ns;
9810 struct nft_ctx ctx = {
9812 .family = NFPROTO_NETDEV,
9815 ctx.family = table->family;
9817 list_for_each_entry(chain, &table->chains, list) {
9819 list_for_each_entry_safe(rule, nr, &chain->rules, list) {
9820 list_del(&rule->list);
9822 nf_tables_rule_release(&ctx, rule);
9825 list_for_each_entry_safe(flowtable, nf, &table->flowtables, list) {
9826 list_del(&flowtable->list);
9828 nf_tables_flowtable_destroy(flowtable);
9830 list_for_each_entry_safe(set, ns, &table->sets, list) {
9831 list_del(&set->list);
9833 nft_set_destroy(&ctx, set);
9835 list_for_each_entry_safe(obj, ne, &table->objects, list) {
9838 nft_obj_destroy(&ctx, obj);
9840 list_for_each_entry_safe(chain, nc, &table->chains, list) {
9842 nft_chain_del(chain);
9844 nf_tables_chain_destroy(&ctx);
9846 nf_tables_table_destroy(&ctx);
9849 static void __nft_release_tables(struct net *net)
9851 struct nftables_pernet *nft_net = nft_pernet(net);
9852 struct nft_table *table, *nt;
9854 list_for_each_entry_safe(table, nt, &nft_net->tables, list) {
9855 if (nft_table_has_owner(table))
9858 list_del(&table->list);
9860 __nft_release_table(net, table);
9864 static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
9867 struct nft_table *table, *to_delete[8];
9868 struct nftables_pernet *nft_net;
9869 struct netlink_notify *n = ptr;
9870 struct net *net = n->net;
9871 unsigned int deleted;
9872 bool restart = false;
9874 if (event != NETLINK_URELEASE || n->protocol != NETLINK_NETFILTER)
9877 nft_net = nft_pernet(net);
9879 mutex_lock(&nft_net->commit_mutex);
9881 list_for_each_entry(table, &nft_net->tables, list) {
9882 if (nft_table_has_owner(table) &&
9883 n->portid == table->nlpid) {
9884 __nft_release_hook(net, table);
9885 list_del_rcu(&table->list);
9886 to_delete[deleted++] = table;
9887 if (deleted >= ARRAY_SIZE(to_delete))
9892 restart = deleted >= ARRAY_SIZE(to_delete);
9895 __nft_release_table(net, to_delete[--deleted]);
9900 mutex_unlock(&nft_net->commit_mutex);
9905 static struct notifier_block nft_nl_notifier = {
9906 .notifier_call = nft_rcv_nl_event,
9909 static int __net_init nf_tables_init_net(struct net *net)
9911 struct nftables_pernet *nft_net = nft_pernet(net);
9913 INIT_LIST_HEAD(&nft_net->tables);
9914 INIT_LIST_HEAD(&nft_net->commit_list);
9915 INIT_LIST_HEAD(&nft_net->module_list);
9916 INIT_LIST_HEAD(&nft_net->notify_list);
9917 mutex_init(&nft_net->commit_mutex);
9918 nft_net->base_seq = 1;
9919 nft_net->validate_state = NFT_VALIDATE_SKIP;
9924 static void __net_exit nf_tables_pre_exit_net(struct net *net)
9926 struct nftables_pernet *nft_net = nft_pernet(net);
9928 mutex_lock(&nft_net->commit_mutex);
9929 __nft_release_hooks(net);
9930 mutex_unlock(&nft_net->commit_mutex);
9933 static void __net_exit nf_tables_exit_net(struct net *net)
9935 struct nftables_pernet *nft_net = nft_pernet(net);
9937 mutex_lock(&nft_net->commit_mutex);
9938 if (!list_empty(&nft_net->commit_list))
9939 __nf_tables_abort(net, NFNL_ABORT_NONE);
9940 __nft_release_tables(net);
9941 mutex_unlock(&nft_net->commit_mutex);
9942 WARN_ON_ONCE(!list_empty(&nft_net->tables));
9943 WARN_ON_ONCE(!list_empty(&nft_net->module_list));
9944 WARN_ON_ONCE(!list_empty(&nft_net->notify_list));
9947 static struct pernet_operations nf_tables_net_ops = {
9948 .init = nf_tables_init_net,
9949 .pre_exit = nf_tables_pre_exit_net,
9950 .exit = nf_tables_exit_net,
9951 .id = &nf_tables_net_id,
9952 .size = sizeof(struct nftables_pernet),
9955 static int __init nf_tables_module_init(void)
9959 err = register_pernet_subsys(&nf_tables_net_ops);
9963 err = nft_chain_filter_init();
9965 goto err_chain_filter;
9967 err = nf_tables_core_module_init();
9969 goto err_core_module;
9971 err = register_netdevice_notifier(&nf_tables_flowtable_notifier);
9973 goto err_netdev_notifier;
9975 err = rhltable_init(&nft_objname_ht, &nft_objname_ht_params);
9977 goto err_rht_objname;
9979 err = nft_offload_init();
9983 err = netlink_register_notifier(&nft_nl_notifier);
9985 goto err_netlink_notifier;
9988 err = nfnetlink_subsys_register(&nf_tables_subsys);
9990 goto err_nfnl_subsys;
9992 nft_chain_route_init();
9997 netlink_unregister_notifier(&nft_nl_notifier);
9998 err_netlink_notifier:
10001 rhltable_destroy(&nft_objname_ht);
10003 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10004 err_netdev_notifier:
10005 nf_tables_core_module_exit();
10007 nft_chain_filter_fini();
10009 unregister_pernet_subsys(&nf_tables_net_ops);
10013 static void __exit nf_tables_module_exit(void)
10015 nfnetlink_subsys_unregister(&nf_tables_subsys);
10016 netlink_unregister_notifier(&nft_nl_notifier);
10017 nft_offload_exit();
10018 unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
10019 nft_chain_filter_fini();
10020 nft_chain_route_fini();
10021 unregister_pernet_subsys(&nf_tables_net_ops);
10022 cancel_work_sync(&trans_destroy_work);
10024 rhltable_destroy(&nft_objname_ht);
10025 nf_tables_core_module_exit();
10028 module_init(nf_tables_module_init);
10029 module_exit(nf_tables_module_exit);
10031 MODULE_LICENSE("GPL");
10032 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
10033 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES);