2 * Copyright (c) 2007-2009 Patrick McHardy <kaber@trash.net>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/skbuff.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nfnetlink.h>
18 #include <linux/netfilter/nf_tables.h>
19 #include <net/netfilter/nf_tables_core.h>
20 #include <net/netfilter/nf_tables.h>
21 #include <net/net_namespace.h>
24 static LIST_HEAD(nf_tables_expressions
);
27 * nft_register_afinfo - register nf_tables address family info
29 * @afi: address family info to register
31 * Register the address family for use with nf_tables. Returns zero on
32 * success or a negative errno code otherwise.
34 int nft_register_afinfo(struct net
*net
, struct nft_af_info
*afi
)
36 INIT_LIST_HEAD(&afi
->tables
);
37 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
38 list_add_tail_rcu(&afi
->list
, &net
->nft
.af_info
);
39 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
42 EXPORT_SYMBOL_GPL(nft_register_afinfo
);
45 * nft_unregister_afinfo - unregister nf_tables address family info
47 * @afi: address family info to unregister
49 * Unregister the address family for use with nf_tables.
51 void nft_unregister_afinfo(struct nft_af_info
*afi
)
53 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
54 list_del_rcu(&afi
->list
);
55 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
57 EXPORT_SYMBOL_GPL(nft_unregister_afinfo
);
59 static struct nft_af_info
*nft_afinfo_lookup(struct net
*net
, int family
)
61 struct nft_af_info
*afi
;
63 list_for_each_entry(afi
, &net
->nft
.af_info
, list
) {
64 if (afi
->family
== family
)
70 static struct nft_af_info
*
71 nf_tables_afinfo_lookup(struct net
*net
, int family
, bool autoload
)
73 struct nft_af_info
*afi
;
75 afi
= nft_afinfo_lookup(net
, family
);
80 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
81 request_module("nft-afinfo-%u", family
);
82 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
83 afi
= nft_afinfo_lookup(net
, family
);
85 return ERR_PTR(-EAGAIN
);
88 return ERR_PTR(-EAFNOSUPPORT
);
91 static void nft_ctx_init(struct nft_ctx
*ctx
,
92 const struct sk_buff
*skb
,
93 const struct nlmsghdr
*nlh
,
94 struct nft_af_info
*afi
,
95 struct nft_table
*table
,
96 struct nft_chain
*chain
,
97 const struct nlattr
* const *nla
)
99 ctx
->net
= sock_net(skb
->sk
);
104 ctx
->portid
= NETLINK_CB(skb
).portid
;
105 ctx
->report
= nlmsg_report(nlh
);
106 ctx
->seq
= nlh
->nlmsg_seq
;
109 static struct nft_trans
*nft_trans_alloc(struct nft_ctx
*ctx
, int msg_type
,
112 struct nft_trans
*trans
;
114 trans
= kzalloc(sizeof(struct nft_trans
) + size
, GFP_KERNEL
);
118 trans
->msg_type
= msg_type
;
124 static void nft_trans_destroy(struct nft_trans
*trans
)
126 list_del(&trans
->list
);
130 static void nf_tables_unregister_hooks(const struct nft_table
*table
,
131 const struct nft_chain
*chain
,
132 unsigned int hook_nops
)
134 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
135 chain
->flags
& NFT_BASE_CHAIN
)
136 nf_unregister_hooks(nft_base_chain(chain
)->ops
, hook_nops
);
139 /* Internal table flags */
140 #define NFT_TABLE_INACTIVE (1 << 15)
142 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
144 struct nft_trans
*trans
;
146 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
150 if (msg_type
== NFT_MSG_NEWTABLE
)
151 ctx
->table
->flags
|= NFT_TABLE_INACTIVE
;
153 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
157 static int nft_deltable(struct nft_ctx
*ctx
)
161 err
= nft_trans_table_add(ctx
, NFT_MSG_DELTABLE
);
165 list_del_rcu(&ctx
->table
->list
);
169 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
171 struct nft_trans
*trans
;
173 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
177 if (msg_type
== NFT_MSG_NEWCHAIN
)
178 ctx
->chain
->flags
|= NFT_CHAIN_INACTIVE
;
180 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
184 static int nft_delchain(struct nft_ctx
*ctx
)
188 err
= nft_trans_chain_add(ctx
, NFT_MSG_DELCHAIN
);
193 list_del_rcu(&ctx
->chain
->list
);
199 nft_rule_is_active(struct net
*net
, const struct nft_rule
*rule
)
201 return (rule
->genmask
& (1 << net
->nft
.gencursor
)) == 0;
204 static inline int gencursor_next(struct net
*net
)
206 return net
->nft
.gencursor
+1 == 1 ? 1 : 0;
210 nft_rule_is_active_next(struct net
*net
, const struct nft_rule
*rule
)
212 return (rule
->genmask
& (1 << gencursor_next(net
))) == 0;
216 nft_rule_activate_next(struct net
*net
, struct nft_rule
*rule
)
218 /* Now inactive, will be active in the future */
219 rule
->genmask
= (1 << net
->nft
.gencursor
);
223 nft_rule_deactivate_next(struct net
*net
, struct nft_rule
*rule
)
225 rule
->genmask
= (1 << gencursor_next(net
));
228 static inline void nft_rule_clear(struct net
*net
, struct nft_rule
*rule
)
234 nf_tables_delrule_deactivate(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
236 /* You cannot delete the same rule twice */
237 if (nft_rule_is_active_next(ctx
->net
, rule
)) {
238 nft_rule_deactivate_next(ctx
->net
, rule
);
245 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
246 struct nft_rule
*rule
)
248 struct nft_trans
*trans
;
250 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
254 nft_trans_rule(trans
) = rule
;
255 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
260 static int nft_delrule(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
262 struct nft_trans
*trans
;
265 trans
= nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
);
269 err
= nf_tables_delrule_deactivate(ctx
, rule
);
271 nft_trans_destroy(trans
);
278 static int nft_delrule_by_chain(struct nft_ctx
*ctx
)
280 struct nft_rule
*rule
;
283 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
284 err
= nft_delrule(ctx
, rule
);
291 /* Internal set flag */
292 #define NFT_SET_INACTIVE (1 << 15)
294 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
297 struct nft_trans
*trans
;
299 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
303 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
304 nft_trans_set_id(trans
) =
305 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
306 set
->flags
|= NFT_SET_INACTIVE
;
308 nft_trans_set(trans
) = set
;
309 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
314 static int nft_delset(struct nft_ctx
*ctx
, struct nft_set
*set
)
318 err
= nft_trans_set_add(ctx
, NFT_MSG_DELSET
, set
);
322 list_del_rcu(&set
->list
);
332 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
333 const struct nlattr
*nla
)
335 struct nft_table
*table
;
337 list_for_each_entry(table
, &afi
->tables
, list
) {
338 if (!nla_strcmp(nla
, table
->name
))
344 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
345 const struct nlattr
*nla
)
347 struct nft_table
*table
;
350 return ERR_PTR(-EINVAL
);
352 table
= nft_table_lookup(afi
, nla
);
356 return ERR_PTR(-ENOENT
);
359 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
361 return ++table
->hgenerator
;
364 static const struct nf_chain_type
*chain_type
[AF_MAX
][NFT_CHAIN_T_MAX
];
366 static const struct nf_chain_type
*
367 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
371 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
372 if (chain_type
[family
][i
] != NULL
&&
373 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
374 return chain_type
[family
][i
];
379 static const struct nf_chain_type
*
380 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
381 const struct nlattr
*nla
,
384 const struct nf_chain_type
*type
;
386 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
389 #ifdef CONFIG_MODULES
391 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
392 request_module("nft-chain-%u-%.*s", afi
->family
,
393 nla_len(nla
), (const char *)nla_data(nla
));
394 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
395 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
397 return ERR_PTR(-EAGAIN
);
400 return ERR_PTR(-ENOENT
);
403 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
404 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
},
405 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
408 static int nf_tables_fill_table_info(struct sk_buff
*skb
, struct net
*net
,
409 u32 portid
, u32 seq
, int event
, u32 flags
,
410 int family
, const struct nft_table
*table
)
412 struct nlmsghdr
*nlh
;
413 struct nfgenmsg
*nfmsg
;
415 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
416 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
418 goto nla_put_failure
;
420 nfmsg
= nlmsg_data(nlh
);
421 nfmsg
->nfgen_family
= family
;
422 nfmsg
->version
= NFNETLINK_V0
;
423 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
425 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
426 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
427 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
428 goto nla_put_failure
;
430 return nlmsg_end(skb
, nlh
);
433 nlmsg_trim(skb
, nlh
);
437 static int nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
443 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
447 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
451 err
= nf_tables_fill_table_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
452 event
, 0, ctx
->afi
->family
, ctx
->table
);
458 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
459 ctx
->report
, GFP_KERNEL
);
462 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
468 static int nf_tables_dump_tables(struct sk_buff
*skb
,
469 struct netlink_callback
*cb
)
471 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
472 const struct nft_af_info
*afi
;
473 const struct nft_table
*table
;
474 unsigned int idx
= 0, s_idx
= cb
->args
[0];
475 struct net
*net
= sock_net(skb
->sk
);
476 int family
= nfmsg
->nfgen_family
;
479 cb
->seq
= net
->nft
.base_seq
;
481 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
482 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
485 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
489 memset(&cb
->args
[1], 0,
490 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
491 if (nf_tables_fill_table_info(skb
, net
,
492 NETLINK_CB(cb
->skb
).portid
,
496 afi
->family
, table
) < 0)
499 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
510 static int nf_tables_gettable(struct sock
*nlsk
, struct sk_buff
*skb
,
511 const struct nlmsghdr
*nlh
,
512 const struct nlattr
* const nla
[])
514 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
515 const struct nft_af_info
*afi
;
516 const struct nft_table
*table
;
517 struct sk_buff
*skb2
;
518 struct net
*net
= sock_net(skb
->sk
);
519 int family
= nfmsg
->nfgen_family
;
522 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
523 struct netlink_dump_control c
= {
524 .dump
= nf_tables_dump_tables
,
526 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
529 afi
= nf_tables_afinfo_lookup(net
, family
, false);
533 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
535 return PTR_ERR(table
);
536 if (table
->flags
& NFT_TABLE_INACTIVE
)
539 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
543 err
= nf_tables_fill_table_info(skb2
, net
, NETLINK_CB(skb
).portid
,
544 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
549 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
556 static int nf_tables_table_enable(const struct nft_af_info
*afi
,
557 struct nft_table
*table
)
559 struct nft_chain
*chain
;
562 list_for_each_entry(chain
, &table
->chains
, list
) {
563 if (!(chain
->flags
& NFT_BASE_CHAIN
))
566 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
574 list_for_each_entry(chain
, &table
->chains
, list
) {
575 if (!(chain
->flags
& NFT_BASE_CHAIN
))
581 nf_unregister_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
586 static void nf_tables_table_disable(const struct nft_af_info
*afi
,
587 struct nft_table
*table
)
589 struct nft_chain
*chain
;
591 list_for_each_entry(chain
, &table
->chains
, list
) {
592 if (chain
->flags
& NFT_BASE_CHAIN
)
593 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
598 static int nf_tables_updtable(struct nft_ctx
*ctx
)
600 struct nft_trans
*trans
;
604 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
607 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
608 if (flags
& ~NFT_TABLE_F_DORMANT
)
611 if (flags
== ctx
->table
->flags
)
614 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
615 sizeof(struct nft_trans_table
));
619 if ((flags
& NFT_TABLE_F_DORMANT
) &&
620 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
621 nft_trans_table_enable(trans
) = false;
622 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
623 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
624 ret
= nf_tables_table_enable(ctx
->afi
, ctx
->table
);
626 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
627 nft_trans_table_enable(trans
) = true;
633 nft_trans_table_update(trans
) = true;
634 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
637 nft_trans_destroy(trans
);
641 static int nf_tables_newtable(struct sock
*nlsk
, struct sk_buff
*skb
,
642 const struct nlmsghdr
*nlh
,
643 const struct nlattr
* const nla
[])
645 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
646 const struct nlattr
*name
;
647 struct nft_af_info
*afi
;
648 struct nft_table
*table
;
649 struct net
*net
= sock_net(skb
->sk
);
650 int family
= nfmsg
->nfgen_family
;
655 afi
= nf_tables_afinfo_lookup(net
, family
, true);
659 name
= nla
[NFTA_TABLE_NAME
];
660 table
= nf_tables_table_lookup(afi
, name
);
662 if (PTR_ERR(table
) != -ENOENT
)
663 return PTR_ERR(table
);
668 if (table
->flags
& NFT_TABLE_INACTIVE
)
670 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
672 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
675 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
676 return nf_tables_updtable(&ctx
);
679 if (nla
[NFTA_TABLE_FLAGS
]) {
680 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
681 if (flags
& ~NFT_TABLE_F_DORMANT
)
685 if (!try_module_get(afi
->owner
))
686 return -EAFNOSUPPORT
;
688 table
= kzalloc(sizeof(*table
) + nla_len(name
), GFP_KERNEL
);
690 module_put(afi
->owner
);
694 nla_strlcpy(table
->name
, name
, nla_len(name
));
695 INIT_LIST_HEAD(&table
->chains
);
696 INIT_LIST_HEAD(&table
->sets
);
697 table
->flags
= flags
;
699 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
700 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
703 module_put(afi
->owner
);
706 list_add_tail_rcu(&table
->list
, &afi
->tables
);
710 static int nft_flush_table(struct nft_ctx
*ctx
)
713 struct nft_chain
*chain
, *nc
;
714 struct nft_set
*set
, *ns
;
716 list_for_each_entry_safe(chain
, nc
, &ctx
->table
->chains
, list
) {
719 err
= nft_delrule_by_chain(ctx
);
723 err
= nft_delchain(ctx
);
728 list_for_each_entry_safe(set
, ns
, &ctx
->table
->sets
, list
) {
729 if (set
->flags
& NFT_SET_ANONYMOUS
&&
730 !list_empty(&set
->bindings
))
733 err
= nft_delset(ctx
, set
);
738 err
= nft_deltable(ctx
);
743 static int nft_flush(struct nft_ctx
*ctx
, int family
)
745 struct nft_af_info
*afi
;
746 struct nft_table
*table
, *nt
;
747 const struct nlattr
* const *nla
= ctx
->nla
;
750 list_for_each_entry(afi
, &ctx
->net
->nft
.af_info
, list
) {
751 if (family
!= AF_UNSPEC
&& afi
->family
!= family
)
755 list_for_each_entry_safe(table
, nt
, &afi
->tables
, list
) {
756 if (nla
[NFTA_TABLE_NAME
] &&
757 nla_strcmp(nla
[NFTA_TABLE_NAME
], table
->name
) != 0)
762 err
= nft_flush_table(ctx
);
771 static int nf_tables_deltable(struct sock
*nlsk
, struct sk_buff
*skb
,
772 const struct nlmsghdr
*nlh
,
773 const struct nlattr
* const nla
[])
775 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
776 struct nft_af_info
*afi
;
777 struct nft_table
*table
;
778 struct net
*net
= sock_net(skb
->sk
);
779 int family
= nfmsg
->nfgen_family
;
782 nft_ctx_init(&ctx
, skb
, nlh
, NULL
, NULL
, NULL
, nla
);
783 if (family
== AF_UNSPEC
|| nla
[NFTA_TABLE_NAME
] == NULL
)
784 return nft_flush(&ctx
, family
);
786 afi
= nf_tables_afinfo_lookup(net
, family
, false);
790 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
792 return PTR_ERR(table
);
793 if (table
->flags
& NFT_TABLE_INACTIVE
)
799 return nft_flush_table(&ctx
);
802 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
804 BUG_ON(ctx
->table
->use
> 0);
807 module_put(ctx
->afi
->owner
);
810 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
814 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
815 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
819 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
821 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
824 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
826 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
828 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
829 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
830 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
832 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
838 static struct nft_chain
*
839 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
)
841 struct nft_chain
*chain
;
843 list_for_each_entry(chain
, &table
->chains
, list
) {
844 if (chain
->handle
== handle
)
848 return ERR_PTR(-ENOENT
);
851 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
852 const struct nlattr
*nla
)
854 struct nft_chain
*chain
;
857 return ERR_PTR(-EINVAL
);
859 list_for_each_entry(chain
, &table
->chains
, list
) {
860 if (!nla_strcmp(nla
, chain
->name
))
864 return ERR_PTR(-ENOENT
);
867 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
868 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
},
869 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
870 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
871 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
872 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
873 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
874 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
875 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
878 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
879 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
880 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
883 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
885 struct nft_stats
*cpu_stats
, total
;
891 memset(&total
, 0, sizeof(total
));
892 for_each_possible_cpu(cpu
) {
893 cpu_stats
= per_cpu_ptr(stats
, cpu
);
895 seq
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
896 pkts
= cpu_stats
->pkts
;
897 bytes
= cpu_stats
->bytes
;
898 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, seq
));
900 total
.bytes
+= bytes
;
902 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
904 goto nla_put_failure
;
906 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
)) ||
907 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
)))
908 goto nla_put_failure
;
910 nla_nest_end(skb
, nest
);
917 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, struct net
*net
,
918 u32 portid
, u32 seq
, int event
, u32 flags
,
919 int family
, const struct nft_table
*table
,
920 const struct nft_chain
*chain
)
922 struct nlmsghdr
*nlh
;
923 struct nfgenmsg
*nfmsg
;
925 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
926 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
928 goto nla_put_failure
;
930 nfmsg
= nlmsg_data(nlh
);
931 nfmsg
->nfgen_family
= family
;
932 nfmsg
->version
= NFNETLINK_V0
;
933 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
935 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
936 goto nla_put_failure
;
937 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
)))
938 goto nla_put_failure
;
939 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
940 goto nla_put_failure
;
942 if (chain
->flags
& NFT_BASE_CHAIN
) {
943 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
944 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
947 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
949 goto nla_put_failure
;
950 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
951 goto nla_put_failure
;
952 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
953 goto nla_put_failure
;
954 nla_nest_end(skb
, nest
);
956 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
957 htonl(basechain
->policy
)))
958 goto nla_put_failure
;
960 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
961 goto nla_put_failure
;
963 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
964 goto nla_put_failure
;
967 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
968 goto nla_put_failure
;
970 return nlmsg_end(skb
, nlh
);
973 nlmsg_trim(skb
, nlh
);
977 static int nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
983 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
987 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
991 err
= nf_tables_fill_chain_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
992 event
, 0, ctx
->afi
->family
, ctx
->table
,
999 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1000 ctx
->report
, GFP_KERNEL
);
1003 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1009 static int nf_tables_dump_chains(struct sk_buff
*skb
,
1010 struct netlink_callback
*cb
)
1012 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1013 const struct nft_af_info
*afi
;
1014 const struct nft_table
*table
;
1015 const struct nft_chain
*chain
;
1016 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1017 struct net
*net
= sock_net(skb
->sk
);
1018 int family
= nfmsg
->nfgen_family
;
1021 cb
->seq
= net
->nft
.base_seq
;
1023 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1024 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1027 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1028 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1032 memset(&cb
->args
[1], 0,
1033 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1034 if (nf_tables_fill_chain_info(skb
, net
,
1035 NETLINK_CB(cb
->skb
).portid
,
1039 afi
->family
, table
, chain
) < 0)
1042 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1054 static int nf_tables_getchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1055 const struct nlmsghdr
*nlh
,
1056 const struct nlattr
* const nla
[])
1058 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1059 const struct nft_af_info
*afi
;
1060 const struct nft_table
*table
;
1061 const struct nft_chain
*chain
;
1062 struct sk_buff
*skb2
;
1063 struct net
*net
= sock_net(skb
->sk
);
1064 int family
= nfmsg
->nfgen_family
;
1067 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1068 struct netlink_dump_control c
= {
1069 .dump
= nf_tables_dump_chains
,
1071 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1074 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1076 return PTR_ERR(afi
);
1078 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1080 return PTR_ERR(table
);
1081 if (table
->flags
& NFT_TABLE_INACTIVE
)
1084 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1086 return PTR_ERR(chain
);
1087 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1090 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1094 err
= nf_tables_fill_chain_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1095 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
1096 family
, table
, chain
);
1100 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1107 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
1108 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
1109 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
1112 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
1114 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
1115 struct nft_stats __percpu
*newstats
;
1116 struct nft_stats
*stats
;
1119 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
);
1121 return ERR_PTR(err
);
1123 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
1124 return ERR_PTR(-EINVAL
);
1126 newstats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1127 if (newstats
== NULL
)
1128 return ERR_PTR(-ENOMEM
);
1130 /* Restore old counters on this cpu, no problem. Per-cpu statistics
1131 * are not exposed to userspace.
1133 stats
= this_cpu_ptr(newstats
);
1134 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
1135 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
1140 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
1141 struct nft_stats __percpu
*newstats
)
1143 if (newstats
== NULL
)
1147 struct nft_stats __percpu
*oldstats
=
1148 nft_dereference(chain
->stats
);
1150 rcu_assign_pointer(chain
->stats
, newstats
);
1152 free_percpu(oldstats
);
1154 rcu_assign_pointer(chain
->stats
, newstats
);
1157 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
1159 BUG_ON(chain
->use
> 0);
1161 if (chain
->flags
& NFT_BASE_CHAIN
) {
1162 module_put(nft_base_chain(chain
)->type
->owner
);
1163 free_percpu(nft_base_chain(chain
)->stats
);
1164 kfree(nft_base_chain(chain
));
1170 static int nf_tables_newchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1171 const struct nlmsghdr
*nlh
,
1172 const struct nlattr
* const nla
[])
1174 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1175 const struct nlattr
* uninitialized_var(name
);
1176 struct nft_af_info
*afi
;
1177 struct nft_table
*table
;
1178 struct nft_chain
*chain
;
1179 struct nft_base_chain
*basechain
= NULL
;
1180 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
1181 struct net
*net
= sock_net(skb
->sk
);
1182 int family
= nfmsg
->nfgen_family
;
1183 u8 policy
= NF_ACCEPT
;
1186 struct nft_stats __percpu
*stats
;
1191 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1193 afi
= nf_tables_afinfo_lookup(net
, family
, true);
1195 return PTR_ERR(afi
);
1197 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1199 return PTR_ERR(table
);
1202 name
= nla
[NFTA_CHAIN_NAME
];
1204 if (nla
[NFTA_CHAIN_HANDLE
]) {
1205 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
1206 chain
= nf_tables_chain_lookup_byhandle(table
, handle
);
1208 return PTR_ERR(chain
);
1210 chain
= nf_tables_chain_lookup(table
, name
);
1211 if (IS_ERR(chain
)) {
1212 if (PTR_ERR(chain
) != -ENOENT
)
1213 return PTR_ERR(chain
);
1218 if (nla
[NFTA_CHAIN_POLICY
]) {
1219 if ((chain
!= NULL
&&
1220 !(chain
->flags
& NFT_BASE_CHAIN
)) ||
1221 nla
[NFTA_CHAIN_HOOK
] == NULL
)
1224 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
1234 if (chain
!= NULL
) {
1235 struct nft_stats
*stats
= NULL
;
1236 struct nft_trans
*trans
;
1238 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1240 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1242 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1245 if (nla
[NFTA_CHAIN_HANDLE
] && name
&&
1246 !IS_ERR(nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
])))
1249 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1250 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1253 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1255 return PTR_ERR(stats
);
1258 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1259 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1260 sizeof(struct nft_trans_chain
));
1264 nft_trans_chain_stats(trans
) = stats
;
1265 nft_trans_chain_update(trans
) = true;
1267 if (nla
[NFTA_CHAIN_POLICY
])
1268 nft_trans_chain_policy(trans
) = policy
;
1270 nft_trans_chain_policy(trans
) = -1;
1272 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1273 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1274 NFT_CHAIN_MAXNAMELEN
);
1276 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1280 if (table
->use
== UINT_MAX
)
1283 if (nla
[NFTA_CHAIN_HOOK
]) {
1284 const struct nf_chain_type
*type
;
1285 struct nf_hook_ops
*ops
;
1287 u32 hooknum
, priority
;
1289 type
= chain_type
[family
][NFT_CHAIN_T_DEFAULT
];
1290 if (nla
[NFTA_CHAIN_TYPE
]) {
1291 type
= nf_tables_chain_type_lookup(afi
,
1292 nla
[NFTA_CHAIN_TYPE
],
1295 return PTR_ERR(type
);
1298 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1302 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1303 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1306 hooknum
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1307 if (hooknum
>= afi
->nhooks
)
1309 priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1311 if (!(type
->hook_mask
& (1 << hooknum
)))
1313 if (!try_module_get(type
->owner
))
1315 hookfn
= type
->hooks
[hooknum
];
1317 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1318 if (basechain
== NULL
)
1321 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1322 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1323 if (IS_ERR(stats
)) {
1324 module_put(type
->owner
);
1326 return PTR_ERR(stats
);
1328 basechain
->stats
= stats
;
1330 stats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1331 if (stats
== NULL
) {
1332 module_put(type
->owner
);
1336 rcu_assign_pointer(basechain
->stats
, stats
);
1339 basechain
->type
= type
;
1340 chain
= &basechain
->chain
;
1342 for (i
= 0; i
< afi
->nops
; i
++) {
1343 ops
= &basechain
->ops
[i
];
1345 ops
->owner
= afi
->owner
;
1346 ops
->hooknum
= hooknum
;
1347 ops
->priority
= priority
;
1349 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1352 if (afi
->hook_ops_init
)
1353 afi
->hook_ops_init(ops
, i
);
1356 chain
->flags
|= NFT_BASE_CHAIN
;
1357 basechain
->policy
= policy
;
1359 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1364 INIT_LIST_HEAD(&chain
->rules
);
1365 chain
->handle
= nf_tables_alloc_handle(table
);
1367 chain
->table
= table
;
1368 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1370 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1371 chain
->flags
& NFT_BASE_CHAIN
) {
1372 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
1377 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1378 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1383 list_add_tail_rcu(&chain
->list
, &table
->chains
);
1386 nf_tables_unregister_hooks(table
, chain
, afi
->nops
);
1388 nf_tables_chain_destroy(chain
);
1392 static int nf_tables_delchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1393 const struct nlmsghdr
*nlh
,
1394 const struct nlattr
* const nla
[])
1396 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1397 struct nft_af_info
*afi
;
1398 struct nft_table
*table
;
1399 struct nft_chain
*chain
;
1400 struct net
*net
= sock_net(skb
->sk
);
1401 int family
= nfmsg
->nfgen_family
;
1404 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1406 return PTR_ERR(afi
);
1408 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1410 return PTR_ERR(table
);
1411 if (table
->flags
& NFT_TABLE_INACTIVE
)
1414 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1416 return PTR_ERR(chain
);
1417 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1422 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1424 return nft_delchain(&ctx
);
1432 * nft_register_expr - register nf_tables expr type
1435 * Registers the expr type for use with nf_tables. Returns zero on
1436 * success or a negative errno code otherwise.
1438 int nft_register_expr(struct nft_expr_type
*type
)
1440 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1441 if (type
->family
== NFPROTO_UNSPEC
)
1442 list_add_tail_rcu(&type
->list
, &nf_tables_expressions
);
1444 list_add_rcu(&type
->list
, &nf_tables_expressions
);
1445 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1448 EXPORT_SYMBOL_GPL(nft_register_expr
);
1451 * nft_unregister_expr - unregister nf_tables expr type
1454 * Unregisters the expr typefor use with nf_tables.
1456 void nft_unregister_expr(struct nft_expr_type
*type
)
1458 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1459 list_del_rcu(&type
->list
);
1460 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1462 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1464 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1467 const struct nft_expr_type
*type
;
1469 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1470 if (!nla_strcmp(nla
, type
->name
) &&
1471 (!type
->family
|| type
->family
== family
))
1477 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1480 const struct nft_expr_type
*type
;
1483 return ERR_PTR(-EINVAL
);
1485 type
= __nft_expr_type_get(family
, nla
);
1486 if (type
!= NULL
&& try_module_get(type
->owner
))
1489 #ifdef CONFIG_MODULES
1491 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1492 request_module("nft-expr-%u-%.*s", family
,
1493 nla_len(nla
), (char *)nla_data(nla
));
1494 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1495 if (__nft_expr_type_get(family
, nla
))
1496 return ERR_PTR(-EAGAIN
);
1498 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1499 request_module("nft-expr-%.*s",
1500 nla_len(nla
), (char *)nla_data(nla
));
1501 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1502 if (__nft_expr_type_get(family
, nla
))
1503 return ERR_PTR(-EAGAIN
);
1506 return ERR_PTR(-ENOENT
);
1509 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1510 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1511 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1514 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1515 const struct nft_expr
*expr
)
1517 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1518 goto nla_put_failure
;
1520 if (expr
->ops
->dump
) {
1521 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1523 goto nla_put_failure
;
1524 if (expr
->ops
->dump(skb
, expr
) < 0)
1525 goto nla_put_failure
;
1526 nla_nest_end(skb
, data
);
1535 struct nft_expr_info
{
1536 const struct nft_expr_ops
*ops
;
1537 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1540 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1541 const struct nlattr
*nla
,
1542 struct nft_expr_info
*info
)
1544 const struct nft_expr_type
*type
;
1545 const struct nft_expr_ops
*ops
;
1546 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1549 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
);
1553 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1555 return PTR_ERR(type
);
1557 if (tb
[NFTA_EXPR_DATA
]) {
1558 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1559 tb
[NFTA_EXPR_DATA
], type
->policy
);
1563 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1565 if (type
->select_ops
!= NULL
) {
1566 ops
= type
->select_ops(ctx
,
1567 (const struct nlattr
* const *)info
->tb
);
1579 module_put(type
->owner
);
1583 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1584 const struct nft_expr_info
*info
,
1585 struct nft_expr
*expr
)
1587 const struct nft_expr_ops
*ops
= info
->ops
;
1592 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1604 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1605 struct nft_expr
*expr
)
1607 if (expr
->ops
->destroy
)
1608 expr
->ops
->destroy(ctx
, expr
);
1609 module_put(expr
->ops
->type
->owner
);
1616 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1619 struct nft_rule
*rule
;
1621 // FIXME: this sucks
1622 list_for_each_entry(rule
, &chain
->rules
, list
) {
1623 if (handle
== rule
->handle
)
1627 return ERR_PTR(-ENOENT
);
1630 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1631 const struct nlattr
*nla
)
1634 return ERR_PTR(-EINVAL
);
1636 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1639 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1640 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
},
1641 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1642 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1643 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1644 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1645 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1646 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1647 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1648 .len
= NFT_USERDATA_MAXLEN
},
1651 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, struct net
*net
,
1652 u32 portid
, u32 seq
, int event
,
1653 u32 flags
, int family
,
1654 const struct nft_table
*table
,
1655 const struct nft_chain
*chain
,
1656 const struct nft_rule
*rule
)
1658 struct nlmsghdr
*nlh
;
1659 struct nfgenmsg
*nfmsg
;
1660 const struct nft_expr
*expr
, *next
;
1661 struct nlattr
*list
;
1662 const struct nft_rule
*prule
;
1663 int type
= event
| NFNL_SUBSYS_NFTABLES
<< 8;
1665 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
),
1668 goto nla_put_failure
;
1670 nfmsg
= nlmsg_data(nlh
);
1671 nfmsg
->nfgen_family
= family
;
1672 nfmsg
->version
= NFNETLINK_V0
;
1673 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
1675 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1676 goto nla_put_failure
;
1677 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1678 goto nla_put_failure
;
1679 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
)))
1680 goto nla_put_failure
;
1682 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1683 prule
= list_entry(rule
->list
.prev
, struct nft_rule
, list
);
1684 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1685 cpu_to_be64(prule
->handle
)))
1686 goto nla_put_failure
;
1689 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1691 goto nla_put_failure
;
1692 nft_rule_for_each_expr(expr
, next
, rule
) {
1693 struct nlattr
*elem
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
1695 goto nla_put_failure
;
1696 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1697 goto nla_put_failure
;
1698 nla_nest_end(skb
, elem
);
1700 nla_nest_end(skb
, list
);
1703 nla_put(skb
, NFTA_RULE_USERDATA
, rule
->ulen
, nft_userdata(rule
)))
1704 goto nla_put_failure
;
1706 return nlmsg_end(skb
, nlh
);
1709 nlmsg_trim(skb
, nlh
);
1713 static int nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1714 const struct nft_rule
*rule
,
1717 struct sk_buff
*skb
;
1721 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1725 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1729 err
= nf_tables_fill_rule_info(skb
, ctx
->net
, ctx
->portid
, ctx
->seq
,
1730 event
, 0, ctx
->afi
->family
, ctx
->table
,
1737 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1738 ctx
->report
, GFP_KERNEL
);
1741 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1747 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1748 struct netlink_callback
*cb
)
1750 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1751 const struct nft_af_info
*afi
;
1752 const struct nft_table
*table
;
1753 const struct nft_chain
*chain
;
1754 const struct nft_rule
*rule
;
1755 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1756 struct net
*net
= sock_net(skb
->sk
);
1757 int family
= nfmsg
->nfgen_family
;
1760 cb
->seq
= net
->nft
.base_seq
;
1762 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1763 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1766 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1767 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1768 list_for_each_entry_rcu(rule
, &chain
->rules
, list
) {
1769 if (!nft_rule_is_active(net
, rule
))
1774 memset(&cb
->args
[1], 0,
1775 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1776 if (nf_tables_fill_rule_info(skb
, net
, NETLINK_CB(cb
->skb
).portid
,
1779 NLM_F_MULTI
| NLM_F_APPEND
,
1780 afi
->family
, table
, chain
, rule
) < 0)
1783 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1797 static int nf_tables_getrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1798 const struct nlmsghdr
*nlh
,
1799 const struct nlattr
* const nla
[])
1801 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1802 const struct nft_af_info
*afi
;
1803 const struct nft_table
*table
;
1804 const struct nft_chain
*chain
;
1805 const struct nft_rule
*rule
;
1806 struct sk_buff
*skb2
;
1807 struct net
*net
= sock_net(skb
->sk
);
1808 int family
= nfmsg
->nfgen_family
;
1811 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1812 struct netlink_dump_control c
= {
1813 .dump
= nf_tables_dump_rules
,
1815 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1818 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1820 return PTR_ERR(afi
);
1822 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1824 return PTR_ERR(table
);
1825 if (table
->flags
& NFT_TABLE_INACTIVE
)
1828 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1830 return PTR_ERR(chain
);
1831 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1834 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
1836 return PTR_ERR(rule
);
1838 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1842 err
= nf_tables_fill_rule_info(skb2
, net
, NETLINK_CB(skb
).portid
,
1843 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
1844 family
, table
, chain
, rule
);
1848 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1855 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
1856 struct nft_rule
*rule
)
1858 struct nft_expr
*expr
;
1861 * Careful: some expressions might not be initialized in case this
1862 * is called on error from nf_tables_newrule().
1864 expr
= nft_expr_first(rule
);
1865 while (expr
->ops
&& expr
!= nft_expr_last(rule
)) {
1866 nf_tables_expr_destroy(ctx
, expr
);
1867 expr
= nft_expr_next(expr
);
1872 #define NFT_RULE_MAXEXPRS 128
1874 static struct nft_expr_info
*info
;
1876 static int nf_tables_newrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1877 const struct nlmsghdr
*nlh
,
1878 const struct nlattr
* const nla
[])
1880 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1881 struct nft_af_info
*afi
;
1882 struct net
*net
= sock_net(skb
->sk
);
1883 struct nft_table
*table
;
1884 struct nft_chain
*chain
;
1885 struct nft_rule
*rule
, *old_rule
= NULL
;
1886 struct nft_trans
*trans
= NULL
;
1887 struct nft_expr
*expr
;
1890 unsigned int size
, i
, n
, ulen
= 0;
1893 u64 handle
, pos_handle
;
1895 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1897 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
1899 return PTR_ERR(afi
);
1901 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1903 return PTR_ERR(table
);
1905 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1907 return PTR_ERR(chain
);
1909 if (nla
[NFTA_RULE_HANDLE
]) {
1910 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
1911 rule
= __nf_tables_rule_lookup(chain
, handle
);
1913 return PTR_ERR(rule
);
1915 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1917 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1922 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1924 handle
= nf_tables_alloc_handle(table
);
1926 if (chain
->use
== UINT_MAX
)
1930 if (nla
[NFTA_RULE_POSITION
]) {
1931 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
1934 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
1935 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
1936 if (IS_ERR(old_rule
))
1937 return PTR_ERR(old_rule
);
1940 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1944 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
1945 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
1947 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
1949 if (n
== NFT_RULE_MAXEXPRS
)
1951 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
1954 size
+= info
[n
].ops
->size
;
1959 if (nla
[NFTA_RULE_USERDATA
])
1960 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
1963 rule
= kzalloc(sizeof(*rule
) + size
+ ulen
, GFP_KERNEL
);
1967 nft_rule_activate_next(net
, rule
);
1969 rule
->handle
= handle
;
1974 nla_memcpy(nft_userdata(rule
), nla
[NFTA_RULE_USERDATA
], ulen
);
1976 expr
= nft_expr_first(rule
);
1977 for (i
= 0; i
< n
; i
++) {
1978 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
1982 expr
= nft_expr_next(expr
);
1985 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
1986 if (nft_rule_is_active_next(net
, old_rule
)) {
1987 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
1989 if (trans
== NULL
) {
1993 nft_rule_deactivate_next(net
, old_rule
);
1995 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2000 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
2002 list_add_rcu(&rule
->list
, &old_rule
->list
);
2004 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
2007 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
2009 list_add_rcu(&rule
->list
, &chain
->rules
);
2012 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
2020 list_del_rcu(&rule
->list
);
2022 list_del_rcu(&nft_trans_rule(trans
)->list
);
2023 nft_rule_clear(net
, nft_trans_rule(trans
));
2024 nft_trans_destroy(trans
);
2028 nf_tables_rule_destroy(&ctx
, rule
);
2030 for (i
= 0; i
< n
; i
++) {
2031 if (info
[i
].ops
!= NULL
)
2032 module_put(info
[i
].ops
->type
->owner
);
2037 static int nf_tables_delrule(struct sock
*nlsk
, struct sk_buff
*skb
,
2038 const struct nlmsghdr
*nlh
,
2039 const struct nlattr
* const nla
[])
2041 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2042 struct nft_af_info
*afi
;
2043 struct net
*net
= sock_net(skb
->sk
);
2044 struct nft_table
*table
;
2045 struct nft_chain
*chain
= NULL
;
2046 struct nft_rule
*rule
;
2047 int family
= nfmsg
->nfgen_family
, err
= 0;
2050 afi
= nf_tables_afinfo_lookup(net
, family
, false);
2052 return PTR_ERR(afi
);
2054 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
2056 return PTR_ERR(table
);
2057 if (table
->flags
& NFT_TABLE_INACTIVE
)
2060 if (nla
[NFTA_RULE_CHAIN
]) {
2061 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
2063 return PTR_ERR(chain
);
2066 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
2069 if (nla
[NFTA_RULE_HANDLE
]) {
2070 rule
= nf_tables_rule_lookup(chain
,
2071 nla
[NFTA_RULE_HANDLE
]);
2073 return PTR_ERR(rule
);
2075 err
= nft_delrule(&ctx
, rule
);
2077 err
= nft_delrule_by_chain(&ctx
);
2080 list_for_each_entry(chain
, &table
->chains
, list
) {
2082 err
= nft_delrule_by_chain(&ctx
);
2095 static LIST_HEAD(nf_tables_set_ops
);
2097 int nft_register_set(struct nft_set_ops
*ops
)
2099 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2100 list_add_tail_rcu(&ops
->list
, &nf_tables_set_ops
);
2101 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2104 EXPORT_SYMBOL_GPL(nft_register_set
);
2106 void nft_unregister_set(struct nft_set_ops
*ops
)
2108 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2109 list_del_rcu(&ops
->list
);
2110 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2112 EXPORT_SYMBOL_GPL(nft_unregister_set
);
2115 * Select a set implementation based on the data characteristics and the
2116 * given policy. The total memory use might not be known if no size is
2117 * given, in that case the amount of memory per element is used.
2119 static const struct nft_set_ops
*
2120 nft_select_set_ops(const struct nlattr
* const nla
[],
2121 const struct nft_set_desc
*desc
,
2122 enum nft_set_policies policy
)
2124 const struct nft_set_ops
*ops
, *bops
;
2125 struct nft_set_estimate est
, best
;
2128 #ifdef CONFIG_MODULES
2129 if (list_empty(&nf_tables_set_ops
)) {
2130 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
2131 request_module("nft-set");
2132 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
2133 if (!list_empty(&nf_tables_set_ops
))
2134 return ERR_PTR(-EAGAIN
);
2138 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2139 features
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2140 features
&= NFT_SET_INTERVAL
| NFT_SET_MAP
;
2147 list_for_each_entry(ops
, &nf_tables_set_ops
, list
) {
2148 if ((ops
->features
& features
) != features
)
2150 if (!ops
->estimate(desc
, features
, &est
))
2154 case NFT_SET_POL_PERFORMANCE
:
2155 if (est
.class < best
.class)
2157 if (est
.class == best
.class && est
.size
< best
.size
)
2160 case NFT_SET_POL_MEMORY
:
2161 if (est
.size
< best
.size
)
2163 if (est
.size
== best
.size
&& est
.class < best
.class)
2170 if (!try_module_get(ops
->owner
))
2173 module_put(bops
->owner
);
2182 return ERR_PTR(-EOPNOTSUPP
);
2185 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2186 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
},
2187 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2188 .len
= IFNAMSIZ
- 1 },
2189 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2190 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2191 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2192 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2193 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2194 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2195 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2196 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2199 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2200 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2203 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
,
2204 const struct sk_buff
*skb
,
2205 const struct nlmsghdr
*nlh
,
2206 const struct nlattr
* const nla
[])
2208 struct net
*net
= sock_net(skb
->sk
);
2209 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2210 struct nft_af_info
*afi
= NULL
;
2211 struct nft_table
*table
= NULL
;
2213 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2214 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2216 return PTR_ERR(afi
);
2219 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2221 return -EAFNOSUPPORT
;
2223 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2225 return PTR_ERR(table
);
2226 if (table
->flags
& NFT_TABLE_INACTIVE
)
2230 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2234 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2235 const struct nlattr
*nla
)
2237 struct nft_set
*set
;
2240 return ERR_PTR(-EINVAL
);
2242 list_for_each_entry(set
, &table
->sets
, list
) {
2243 if (!nla_strcmp(nla
, set
->name
))
2246 return ERR_PTR(-ENOENT
);
2249 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2250 const struct nlattr
*nla
)
2252 struct nft_trans
*trans
;
2253 u32 id
= ntohl(nla_get_be32(nla
));
2255 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2256 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2257 id
== nft_trans_set_id(trans
))
2258 return nft_trans_set(trans
);
2260 return ERR_PTR(-ENOENT
);
2263 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2266 const struct nft_set
*i
;
2268 unsigned long *inuse
;
2269 unsigned int n
= 0, min
= 0;
2271 p
= strnchr(name
, IFNAMSIZ
, '%');
2273 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2276 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2280 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2283 if (!sscanf(i
->name
, name
, &tmp
))
2285 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2288 set_bit(tmp
- min
, inuse
);
2291 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2292 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2293 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2294 memset(inuse
, 0, PAGE_SIZE
);
2297 free_page((unsigned long)inuse
);
2300 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2301 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2302 if (!strcmp(set
->name
, i
->name
))
2308 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2309 const struct nft_set
*set
, u16 event
, u16 flags
)
2311 struct nfgenmsg
*nfmsg
;
2312 struct nlmsghdr
*nlh
;
2313 struct nlattr
*desc
;
2314 u32 portid
= ctx
->portid
;
2317 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2318 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2321 goto nla_put_failure
;
2323 nfmsg
= nlmsg_data(nlh
);
2324 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2325 nfmsg
->version
= NFNETLINK_V0
;
2326 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
2328 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2329 goto nla_put_failure
;
2330 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2331 goto nla_put_failure
;
2332 if (set
->flags
!= 0)
2333 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2334 goto nla_put_failure
;
2336 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2337 goto nla_put_failure
;
2338 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2339 goto nla_put_failure
;
2340 if (set
->flags
& NFT_SET_MAP
) {
2341 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2342 goto nla_put_failure
;
2343 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2344 goto nla_put_failure
;
2347 if (set
->policy
!= NFT_SET_POL_PERFORMANCE
) {
2348 if (nla_put_be32(skb
, NFTA_SET_POLICY
, htonl(set
->policy
)))
2349 goto nla_put_failure
;
2352 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2354 goto nla_put_failure
;
2356 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2357 goto nla_put_failure
;
2358 nla_nest_end(skb
, desc
);
2360 return nlmsg_end(skb
, nlh
);
2363 nlmsg_trim(skb
, nlh
);
2367 static int nf_tables_set_notify(const struct nft_ctx
*ctx
,
2368 const struct nft_set
*set
,
2369 int event
, gfp_t gfp_flags
)
2371 struct sk_buff
*skb
;
2372 u32 portid
= ctx
->portid
;
2376 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2380 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2384 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2390 err
= nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
,
2391 ctx
->report
, gfp_flags
);
2394 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, err
);
2398 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2400 const struct nft_set
*set
;
2401 unsigned int idx
, s_idx
= cb
->args
[0];
2402 struct nft_af_info
*afi
;
2403 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2404 struct net
*net
= sock_net(skb
->sk
);
2405 int cur_family
= cb
->args
[3];
2406 struct nft_ctx
*ctx
= cb
->data
, ctx_set
;
2412 cb
->seq
= net
->nft
.base_seq
;
2414 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2415 if (ctx
->afi
&& ctx
->afi
!= afi
)
2419 if (afi
->family
!= cur_family
)
2424 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2425 if (ctx
->table
&& ctx
->table
!= table
)
2429 if (cur_table
!= table
)
2435 list_for_each_entry_rcu(set
, &table
->sets
, list
) {
2440 ctx_set
.table
= table
;
2442 if (nf_tables_fill_set(skb
, &ctx_set
, set
,
2446 cb
->args
[2] = (unsigned long) table
;
2447 cb
->args
[3] = afi
->family
;
2450 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2464 static int nf_tables_dump_sets_done(struct netlink_callback
*cb
)
2470 static int nf_tables_getset(struct sock
*nlsk
, struct sk_buff
*skb
,
2471 const struct nlmsghdr
*nlh
,
2472 const struct nlattr
* const nla
[])
2474 const struct nft_set
*set
;
2476 struct sk_buff
*skb2
;
2477 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2480 /* Verify existance before starting dump */
2481 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2485 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2486 struct netlink_dump_control c
= {
2487 .dump
= nf_tables_dump_sets
,
2488 .done
= nf_tables_dump_sets_done
,
2490 struct nft_ctx
*ctx_dump
;
2492 ctx_dump
= kmalloc(sizeof(*ctx_dump
), GFP_KERNEL
);
2493 if (ctx_dump
== NULL
)
2499 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2502 /* Only accept unspec with dump */
2503 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2504 return -EAFNOSUPPORT
;
2506 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2508 return PTR_ERR(set
);
2509 if (set
->flags
& NFT_SET_INACTIVE
)
2512 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2516 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2520 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2527 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2528 struct nft_set_desc
*desc
,
2529 const struct nlattr
*nla
)
2531 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2534 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
, nft_set_desc_policy
);
2538 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2539 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2544 static int nf_tables_newset(struct sock
*nlsk
, struct sk_buff
*skb
,
2545 const struct nlmsghdr
*nlh
,
2546 const struct nlattr
* const nla
[])
2548 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2549 const struct nft_set_ops
*ops
;
2550 struct nft_af_info
*afi
;
2551 struct net
*net
= sock_net(skb
->sk
);
2552 struct nft_table
*table
;
2553 struct nft_set
*set
;
2555 char name
[IFNAMSIZ
];
2558 u32 ktype
, dtype
, flags
, policy
;
2559 struct nft_set_desc desc
;
2562 if (nla
[NFTA_SET_TABLE
] == NULL
||
2563 nla
[NFTA_SET_NAME
] == NULL
||
2564 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2565 nla
[NFTA_SET_ID
] == NULL
)
2568 memset(&desc
, 0, sizeof(desc
));
2570 ktype
= NFT_DATA_VALUE
;
2571 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2572 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2573 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2577 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2578 if (desc
.klen
== 0 || desc
.klen
> FIELD_SIZEOF(struct nft_data
, data
))
2582 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2583 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2584 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2585 NFT_SET_INTERVAL
| NFT_SET_MAP
))
2590 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2591 if (!(flags
& NFT_SET_MAP
))
2594 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2595 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2596 dtype
!= NFT_DATA_VERDICT
)
2599 if (dtype
!= NFT_DATA_VERDICT
) {
2600 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2602 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2603 if (desc
.dlen
== 0 ||
2604 desc
.dlen
> FIELD_SIZEOF(struct nft_data
, data
))
2607 desc
.dlen
= sizeof(struct nft_data
);
2608 } else if (flags
& NFT_SET_MAP
)
2611 policy
= NFT_SET_POL_PERFORMANCE
;
2612 if (nla
[NFTA_SET_POLICY
] != NULL
)
2613 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
2615 if (nla
[NFTA_SET_DESC
] != NULL
) {
2616 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
2621 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2623 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2625 return PTR_ERR(afi
);
2627 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2629 return PTR_ERR(table
);
2631 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2633 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
]);
2635 if (PTR_ERR(set
) != -ENOENT
)
2636 return PTR_ERR(set
);
2641 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2643 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2648 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2651 ops
= nft_select_set_ops(nla
, &desc
, policy
);
2653 return PTR_ERR(ops
);
2656 if (ops
->privsize
!= NULL
)
2657 size
= ops
->privsize(nla
);
2660 set
= kzalloc(sizeof(*set
) + size
, GFP_KERNEL
);
2664 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
2665 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
2669 INIT_LIST_HEAD(&set
->bindings
);
2672 set
->klen
= desc
.klen
;
2674 set
->dlen
= desc
.dlen
;
2676 set
->size
= desc
.size
;
2677 set
->policy
= policy
;
2679 err
= ops
->init(set
, &desc
, nla
);
2683 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
2687 list_add_tail_rcu(&set
->list
, &table
->sets
);
2694 module_put(ops
->owner
);
2698 static void nft_set_destroy(struct nft_set
*set
)
2700 set
->ops
->destroy(set
);
2701 module_put(set
->ops
->owner
);
2705 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
2707 list_del_rcu(&set
->list
);
2708 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
2709 nft_set_destroy(set
);
2712 static int nf_tables_delset(struct sock
*nlsk
, struct sk_buff
*skb
,
2713 const struct nlmsghdr
*nlh
,
2714 const struct nlattr
* const nla
[])
2716 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2717 struct nft_set
*set
;
2721 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2722 return -EAFNOSUPPORT
;
2723 if (nla
[NFTA_SET_TABLE
] == NULL
)
2726 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2730 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2732 return PTR_ERR(set
);
2733 if (set
->flags
& NFT_SET_INACTIVE
)
2735 if (!list_empty(&set
->bindings
))
2738 return nft_delset(&ctx
, set
);
2741 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
2742 const struct nft_set
*set
,
2743 const struct nft_set_iter
*iter
,
2744 const struct nft_set_elem
*elem
)
2746 enum nft_registers dreg
;
2748 dreg
= nft_type_to_reg(set
->dtype
);
2749 return nft_validate_data_load(ctx
, dreg
, &elem
->data
,
2750 set
->dtype
== NFT_DATA_VERDICT
?
2751 NFT_DATA_VERDICT
: NFT_DATA_VALUE
);
2754 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2755 struct nft_set_binding
*binding
)
2757 struct nft_set_binding
*i
;
2758 struct nft_set_iter iter
;
2760 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
2763 if (set
->flags
& NFT_SET_MAP
) {
2764 /* If the set is already bound to the same chain all
2765 * jumps are already validated for that chain.
2767 list_for_each_entry(i
, &set
->bindings
, list
) {
2768 if (i
->chain
== binding
->chain
)
2775 iter
.fn
= nf_tables_bind_check_setelem
;
2777 set
->ops
->walk(ctx
, set
, &iter
);
2779 /* Destroy anonymous sets if binding fails */
2780 if (set
->flags
& NFT_SET_ANONYMOUS
)
2781 nf_tables_set_destroy(ctx
, set
);
2787 binding
->chain
= ctx
->chain
;
2788 list_add_tail_rcu(&binding
->list
, &set
->bindings
);
2792 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2793 struct nft_set_binding
*binding
)
2795 list_del_rcu(&binding
->list
);
2797 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
2798 !(set
->flags
& NFT_SET_INACTIVE
))
2799 nf_tables_set_destroy(ctx
, set
);
2806 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
2807 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
2808 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
2809 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
2812 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
2813 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
},
2814 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
},
2815 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
2816 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
2819 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
,
2820 const struct sk_buff
*skb
,
2821 const struct nlmsghdr
*nlh
,
2822 const struct nlattr
* const nla
[],
2825 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2826 struct nft_af_info
*afi
;
2827 struct nft_table
*table
;
2828 struct net
*net
= sock_net(skb
->sk
);
2830 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2832 return PTR_ERR(afi
);
2834 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
]);
2836 return PTR_ERR(table
);
2837 if (!trans
&& (table
->flags
& NFT_TABLE_INACTIVE
))
2840 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2844 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
2845 const struct nft_set
*set
,
2846 const struct nft_set_elem
*elem
)
2848 unsigned char *b
= skb_tail_pointer(skb
);
2849 struct nlattr
*nest
;
2851 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
2853 goto nla_put_failure
;
2855 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, &elem
->key
, NFT_DATA_VALUE
,
2857 goto nla_put_failure
;
2859 if (set
->flags
& NFT_SET_MAP
&&
2860 !(elem
->flags
& NFT_SET_ELEM_INTERVAL_END
) &&
2861 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, &elem
->data
,
2862 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
2864 goto nla_put_failure
;
2866 if (elem
->flags
!= 0)
2867 if (nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
, htonl(elem
->flags
)))
2868 goto nla_put_failure
;
2870 nla_nest_end(skb
, nest
);
2878 struct nft_set_dump_args
{
2879 const struct netlink_callback
*cb
;
2880 struct nft_set_iter iter
;
2881 struct sk_buff
*skb
;
2884 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
2885 const struct nft_set
*set
,
2886 const struct nft_set_iter
*iter
,
2887 const struct nft_set_elem
*elem
)
2889 struct nft_set_dump_args
*args
;
2891 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
2892 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
2895 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2897 const struct nft_set
*set
;
2898 struct nft_set_dump_args args
;
2900 struct nlattr
*nla
[NFTA_SET_ELEM_LIST_MAX
+ 1];
2901 struct nfgenmsg
*nfmsg
;
2902 struct nlmsghdr
*nlh
;
2903 struct nlattr
*nest
;
2907 err
= nlmsg_parse(cb
->nlh
, sizeof(struct nfgenmsg
), nla
,
2908 NFTA_SET_ELEM_LIST_MAX
, nft_set_elem_list_policy
);
2912 err
= nft_ctx_init_from_elemattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
,
2917 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2919 return PTR_ERR(set
);
2920 if (set
->flags
& NFT_SET_INACTIVE
)
2923 event
= NFT_MSG_NEWSETELEM
;
2924 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2925 portid
= NETLINK_CB(cb
->skb
).portid
;
2926 seq
= cb
->nlh
->nlmsg_seq
;
2928 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2931 goto nla_put_failure
;
2933 nfmsg
= nlmsg_data(nlh
);
2934 nfmsg
->nfgen_family
= ctx
.afi
->family
;
2935 nfmsg
->version
= NFNETLINK_V0
;
2936 nfmsg
->res_id
= htons(ctx
.net
->nft
.base_seq
& 0xffff);
2938 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, ctx
.table
->name
))
2939 goto nla_put_failure
;
2940 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
2941 goto nla_put_failure
;
2943 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2945 goto nla_put_failure
;
2949 args
.iter
.skip
= cb
->args
[0];
2950 args
.iter
.count
= 0;
2952 args
.iter
.fn
= nf_tables_dump_setelem
;
2953 set
->ops
->walk(&ctx
, set
, &args
.iter
);
2955 nla_nest_end(skb
, nest
);
2956 nlmsg_end(skb
, nlh
);
2958 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
2959 return args
.iter
.err
;
2960 if (args
.iter
.count
== cb
->args
[0])
2963 cb
->args
[0] = args
.iter
.count
;
2970 static int nf_tables_getsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
2971 const struct nlmsghdr
*nlh
,
2972 const struct nlattr
* const nla
[])
2974 const struct nft_set
*set
;
2978 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
2982 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2984 return PTR_ERR(set
);
2985 if (set
->flags
& NFT_SET_INACTIVE
)
2988 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2989 struct netlink_dump_control c
= {
2990 .dump
= nf_tables_dump_set
,
2992 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2997 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
2998 const struct nft_ctx
*ctx
, u32 seq
,
2999 u32 portid
, int event
, u16 flags
,
3000 const struct nft_set
*set
,
3001 const struct nft_set_elem
*elem
)
3003 struct nfgenmsg
*nfmsg
;
3004 struct nlmsghdr
*nlh
;
3005 struct nlattr
*nest
;
3008 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
3009 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
3012 goto nla_put_failure
;
3014 nfmsg
= nlmsg_data(nlh
);
3015 nfmsg
->nfgen_family
= ctx
->afi
->family
;
3016 nfmsg
->version
= NFNETLINK_V0
;
3017 nfmsg
->res_id
= htons(ctx
->net
->nft
.base_seq
& 0xffff);
3019 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
3020 goto nla_put_failure
;
3021 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
3022 goto nla_put_failure
;
3024 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
3026 goto nla_put_failure
;
3028 err
= nf_tables_fill_setelem(skb
, set
, elem
);
3030 goto nla_put_failure
;
3032 nla_nest_end(skb
, nest
);
3034 return nlmsg_end(skb
, nlh
);
3037 nlmsg_trim(skb
, nlh
);
3041 static int nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
3042 const struct nft_set
*set
,
3043 const struct nft_set_elem
*elem
,
3044 int event
, u16 flags
)
3046 struct net
*net
= ctx
->net
;
3047 u32 portid
= ctx
->portid
;
3048 struct sk_buff
*skb
;
3051 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3055 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3059 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
3066 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
3070 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
3074 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
3076 struct nft_set
*set
)
3078 struct nft_trans
*trans
;
3080 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3084 nft_trans_elem_set(trans
) = set
;
3088 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3089 const struct nlattr
*attr
)
3091 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3092 struct nft_data_desc d1
, d2
;
3093 struct nft_set_elem elem
;
3094 struct nft_set_binding
*binding
;
3095 enum nft_registers dreg
;
3096 struct nft_trans
*trans
;
3099 if (set
->size
&& set
->nelems
== set
->size
)
3102 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3103 nft_set_elem_policy
);
3107 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3111 if (nla
[NFTA_SET_ELEM_FLAGS
] != NULL
) {
3112 elem
.flags
= ntohl(nla_get_be32(nla
[NFTA_SET_ELEM_FLAGS
]));
3113 if (elem
.flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3117 if (set
->flags
& NFT_SET_MAP
) {
3118 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3119 !(elem
.flags
& NFT_SET_ELEM_INTERVAL_END
))
3121 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3122 elem
.flags
& NFT_SET_ELEM_INTERVAL_END
)
3125 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3129 err
= nft_data_init(ctx
, &elem
.key
, &d1
, nla
[NFTA_SET_ELEM_KEY
]);
3133 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3137 if (set
->ops
->get(set
, &elem
) == 0)
3140 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3141 err
= nft_data_init(ctx
, &elem
.data
, &d2
, nla
[NFTA_SET_ELEM_DATA
]);
3146 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3149 dreg
= nft_type_to_reg(set
->dtype
);
3150 list_for_each_entry(binding
, &set
->bindings
, list
) {
3151 struct nft_ctx bind_ctx
= {
3153 .table
= ctx
->table
,
3154 .chain
= (struct nft_chain
*)binding
->chain
,
3157 err
= nft_validate_data_load(&bind_ctx
, dreg
,
3158 &elem
.data
, d2
.type
);
3164 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3168 err
= set
->ops
->insert(set
, &elem
);
3172 nft_trans_elem(trans
) = elem
;
3173 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3179 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3180 nft_data_uninit(&elem
.data
, d2
.type
);
3182 nft_data_uninit(&elem
.key
, d1
.type
);
3187 static int nf_tables_newsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3188 const struct nlmsghdr
*nlh
,
3189 const struct nlattr
* const nla
[])
3191 struct net
*net
= sock_net(skb
->sk
);
3192 const struct nlattr
*attr
;
3193 struct nft_set
*set
;
3197 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3200 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, true);
3204 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3206 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3207 set
= nf_tables_set_lookup_byid(net
,
3208 nla
[NFTA_SET_ELEM_LIST_SET_ID
]);
3211 return PTR_ERR(set
);
3214 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3217 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3218 err
= nft_add_set_elem(&ctx
, set
, attr
);
3227 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3228 const struct nlattr
*attr
)
3230 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3231 struct nft_data_desc desc
;
3232 struct nft_set_elem elem
;
3233 struct nft_trans
*trans
;
3236 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3237 nft_set_elem_policy
);
3242 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3245 err
= nft_data_init(ctx
, &elem
.key
, &desc
, nla
[NFTA_SET_ELEM_KEY
]);
3250 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
3253 err
= set
->ops
->get(set
, &elem
);
3257 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
3258 if (trans
== NULL
) {
3263 nft_trans_elem(trans
) = elem
;
3264 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3267 nft_data_uninit(&elem
.key
, desc
.type
);
3272 static int nf_tables_delsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3273 const struct nlmsghdr
*nlh
,
3274 const struct nlattr
* const nla
[])
3276 const struct nlattr
*attr
;
3277 struct nft_set
*set
;
3281 if (nla
[NFTA_SET_ELEM_LIST_ELEMENTS
] == NULL
)
3284 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
3288 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3290 return PTR_ERR(set
);
3291 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3294 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3295 err
= nft_del_setelem(&ctx
, set
, attr
);
3304 static int nf_tables_fill_gen_info(struct sk_buff
*skb
, struct net
*net
,
3305 u32 portid
, u32 seq
)
3307 struct nlmsghdr
*nlh
;
3308 struct nfgenmsg
*nfmsg
;
3309 int event
= (NFNL_SUBSYS_NFTABLES
<< 8) | NFT_MSG_NEWGEN
;
3311 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), 0);
3313 goto nla_put_failure
;
3315 nfmsg
= nlmsg_data(nlh
);
3316 nfmsg
->nfgen_family
= AF_UNSPEC
;
3317 nfmsg
->version
= NFNETLINK_V0
;
3318 nfmsg
->res_id
= htons(net
->nft
.base_seq
& 0xffff);
3320 if (nla_put_be32(skb
, NFTA_GEN_ID
, htonl(net
->nft
.base_seq
)))
3321 goto nla_put_failure
;
3323 return nlmsg_end(skb
, nlh
);
3326 nlmsg_trim(skb
, nlh
);
3330 static int nf_tables_gen_notify(struct net
*net
, struct sk_buff
*skb
, int event
)
3332 struct nlmsghdr
*nlh
= nlmsg_hdr(skb
);
3333 struct sk_buff
*skb2
;
3336 if (nlmsg_report(nlh
) &&
3337 !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3341 skb2
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3345 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
3352 err
= nfnetlink_send(skb2
, net
, NETLINK_CB(skb
).portid
,
3353 NFNLGRP_NFTABLES
, nlmsg_report(nlh
), GFP_KERNEL
);
3356 nfnetlink_set_err(net
, NETLINK_CB(skb
).portid
, NFNLGRP_NFTABLES
,
3362 static int nf_tables_getgen(struct sock
*nlsk
, struct sk_buff
*skb
,
3363 const struct nlmsghdr
*nlh
,
3364 const struct nlattr
* const nla
[])
3366 struct net
*net
= sock_net(skb
->sk
);
3367 struct sk_buff
*skb2
;
3370 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
3374 err
= nf_tables_fill_gen_info(skb2
, net
, NETLINK_CB(skb
).portid
,
3379 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
3385 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
3386 [NFT_MSG_NEWTABLE
] = {
3387 .call_batch
= nf_tables_newtable
,
3388 .attr_count
= NFTA_TABLE_MAX
,
3389 .policy
= nft_table_policy
,
3391 [NFT_MSG_GETTABLE
] = {
3392 .call
= nf_tables_gettable
,
3393 .attr_count
= NFTA_TABLE_MAX
,
3394 .policy
= nft_table_policy
,
3396 [NFT_MSG_DELTABLE
] = {
3397 .call_batch
= nf_tables_deltable
,
3398 .attr_count
= NFTA_TABLE_MAX
,
3399 .policy
= nft_table_policy
,
3401 [NFT_MSG_NEWCHAIN
] = {
3402 .call_batch
= nf_tables_newchain
,
3403 .attr_count
= NFTA_CHAIN_MAX
,
3404 .policy
= nft_chain_policy
,
3406 [NFT_MSG_GETCHAIN
] = {
3407 .call
= nf_tables_getchain
,
3408 .attr_count
= NFTA_CHAIN_MAX
,
3409 .policy
= nft_chain_policy
,
3411 [NFT_MSG_DELCHAIN
] = {
3412 .call_batch
= nf_tables_delchain
,
3413 .attr_count
= NFTA_CHAIN_MAX
,
3414 .policy
= nft_chain_policy
,
3416 [NFT_MSG_NEWRULE
] = {
3417 .call_batch
= nf_tables_newrule
,
3418 .attr_count
= NFTA_RULE_MAX
,
3419 .policy
= nft_rule_policy
,
3421 [NFT_MSG_GETRULE
] = {
3422 .call
= nf_tables_getrule
,
3423 .attr_count
= NFTA_RULE_MAX
,
3424 .policy
= nft_rule_policy
,
3426 [NFT_MSG_DELRULE
] = {
3427 .call_batch
= nf_tables_delrule
,
3428 .attr_count
= NFTA_RULE_MAX
,
3429 .policy
= nft_rule_policy
,
3431 [NFT_MSG_NEWSET
] = {
3432 .call_batch
= nf_tables_newset
,
3433 .attr_count
= NFTA_SET_MAX
,
3434 .policy
= nft_set_policy
,
3436 [NFT_MSG_GETSET
] = {
3437 .call
= nf_tables_getset
,
3438 .attr_count
= NFTA_SET_MAX
,
3439 .policy
= nft_set_policy
,
3441 [NFT_MSG_DELSET
] = {
3442 .call_batch
= nf_tables_delset
,
3443 .attr_count
= NFTA_SET_MAX
,
3444 .policy
= nft_set_policy
,
3446 [NFT_MSG_NEWSETELEM
] = {
3447 .call_batch
= nf_tables_newsetelem
,
3448 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3449 .policy
= nft_set_elem_list_policy
,
3451 [NFT_MSG_GETSETELEM
] = {
3452 .call
= nf_tables_getsetelem
,
3453 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3454 .policy
= nft_set_elem_list_policy
,
3456 [NFT_MSG_DELSETELEM
] = {
3457 .call_batch
= nf_tables_delsetelem
,
3458 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3459 .policy
= nft_set_elem_list_policy
,
3461 [NFT_MSG_GETGEN
] = {
3462 .call
= nf_tables_getgen
,
3466 static void nft_chain_commit_update(struct nft_trans
*trans
)
3468 struct nft_base_chain
*basechain
;
3470 if (nft_trans_chain_name(trans
)[0])
3471 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
3473 if (!(trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
))
3476 basechain
= nft_base_chain(trans
->ctx
.chain
);
3477 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
3479 switch (nft_trans_chain_policy(trans
)) {
3482 basechain
->policy
= nft_trans_chain_policy(trans
);
3487 static void nf_tables_commit_release(struct nft_trans
*trans
)
3489 switch (trans
->msg_type
) {
3490 case NFT_MSG_DELTABLE
:
3491 nf_tables_table_destroy(&trans
->ctx
);
3493 case NFT_MSG_DELCHAIN
:
3494 nf_tables_chain_destroy(trans
->ctx
.chain
);
3496 case NFT_MSG_DELRULE
:
3497 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3499 case NFT_MSG_DELSET
:
3500 nft_set_destroy(nft_trans_set(trans
));
3506 static int nf_tables_commit(struct sk_buff
*skb
)
3508 struct net
*net
= sock_net(skb
->sk
);
3509 struct nft_trans
*trans
, *next
;
3510 struct nft_trans_elem
*te
;
3512 /* Bump generation counter, invalidate any dump in progress */
3513 while (++net
->nft
.base_seq
== 0);
3515 /* A new generation has just started */
3516 net
->nft
.gencursor
= gencursor_next(net
);
3518 /* Make sure all packets have left the previous generation before
3519 * purging old rules.
3523 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3524 switch (trans
->msg_type
) {
3525 case NFT_MSG_NEWTABLE
:
3526 if (nft_trans_table_update(trans
)) {
3527 if (!nft_trans_table_enable(trans
)) {
3528 nf_tables_table_disable(trans
->ctx
.afi
,
3530 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3533 trans
->ctx
.table
->flags
&= ~NFT_TABLE_INACTIVE
;
3535 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
3536 nft_trans_destroy(trans
);
3538 case NFT_MSG_DELTABLE
:
3539 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
3541 case NFT_MSG_NEWCHAIN
:
3542 if (nft_trans_chain_update(trans
))
3543 nft_chain_commit_update(trans
);
3545 trans
->ctx
.chain
->flags
&= ~NFT_CHAIN_INACTIVE
;
3547 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
3548 nft_trans_destroy(trans
);
3550 case NFT_MSG_DELCHAIN
:
3551 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
3552 nf_tables_unregister_hooks(trans
->ctx
.table
,
3554 trans
->ctx
.afi
->nops
);
3556 case NFT_MSG_NEWRULE
:
3557 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3558 nf_tables_rule_notify(&trans
->ctx
,
3559 nft_trans_rule(trans
),
3561 nft_trans_destroy(trans
);
3563 case NFT_MSG_DELRULE
:
3564 list_del_rcu(&nft_trans_rule(trans
)->list
);
3565 nf_tables_rule_notify(&trans
->ctx
,
3566 nft_trans_rule(trans
),
3569 case NFT_MSG_NEWSET
:
3570 nft_trans_set(trans
)->flags
&= ~NFT_SET_INACTIVE
;
3571 /* This avoids hitting -EBUSY when deleting the table
3572 * from the transaction.
3574 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
3575 !list_empty(&nft_trans_set(trans
)->bindings
))
3576 trans
->ctx
.table
->use
--;
3578 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3579 NFT_MSG_NEWSET
, GFP_KERNEL
);
3580 nft_trans_destroy(trans
);
3582 case NFT_MSG_DELSET
:
3583 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3584 NFT_MSG_DELSET
, GFP_KERNEL
);
3586 case NFT_MSG_NEWSETELEM
:
3587 nf_tables_setelem_notify(&trans
->ctx
,
3588 nft_trans_elem_set(trans
),
3589 &nft_trans_elem(trans
),
3590 NFT_MSG_NEWSETELEM
, 0);
3591 nft_trans_destroy(trans
);
3593 case NFT_MSG_DELSETELEM
:
3594 te
= (struct nft_trans_elem
*)trans
->data
;
3595 nf_tables_setelem_notify(&trans
->ctx
, te
->set
,
3597 NFT_MSG_DELSETELEM
, 0);
3598 te
->set
->ops
->get(te
->set
, &te
->elem
);
3599 te
->set
->ops
->remove(te
->set
, &te
->elem
);
3600 nft_data_uninit(&te
->elem
.key
, NFT_DATA_VALUE
);
3601 if (te
->elem
.flags
& NFT_SET_MAP
) {
3602 nft_data_uninit(&te
->elem
.data
,
3605 nft_trans_destroy(trans
);
3612 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3613 list_del(&trans
->list
);
3614 nf_tables_commit_release(trans
);
3617 nf_tables_gen_notify(net
, skb
, NFT_MSG_NEWGEN
);
3622 static void nf_tables_abort_release(struct nft_trans
*trans
)
3624 switch (trans
->msg_type
) {
3625 case NFT_MSG_NEWTABLE
:
3626 nf_tables_table_destroy(&trans
->ctx
);
3628 case NFT_MSG_NEWCHAIN
:
3629 nf_tables_chain_destroy(trans
->ctx
.chain
);
3631 case NFT_MSG_NEWRULE
:
3632 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3634 case NFT_MSG_NEWSET
:
3635 nft_set_destroy(nft_trans_set(trans
));
3641 static int nf_tables_abort(struct sk_buff
*skb
)
3643 struct net
*net
= sock_net(skb
->sk
);
3644 struct nft_trans
*trans
, *next
;
3645 struct nft_set
*set
;
3647 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3648 switch (trans
->msg_type
) {
3649 case NFT_MSG_NEWTABLE
:
3650 if (nft_trans_table_update(trans
)) {
3651 if (nft_trans_table_enable(trans
)) {
3652 nf_tables_table_disable(trans
->ctx
.afi
,
3654 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3656 nft_trans_destroy(trans
);
3658 list_del_rcu(&trans
->ctx
.table
->list
);
3661 case NFT_MSG_DELTABLE
:
3662 list_add_tail_rcu(&trans
->ctx
.table
->list
,
3663 &trans
->ctx
.afi
->tables
);
3664 nft_trans_destroy(trans
);
3666 case NFT_MSG_NEWCHAIN
:
3667 if (nft_trans_chain_update(trans
)) {
3668 if (nft_trans_chain_stats(trans
))
3669 free_percpu(nft_trans_chain_stats(trans
));
3671 nft_trans_destroy(trans
);
3673 trans
->ctx
.table
->use
--;
3674 list_del_rcu(&trans
->ctx
.chain
->list
);
3675 nf_tables_unregister_hooks(trans
->ctx
.table
,
3677 trans
->ctx
.afi
->nops
);
3680 case NFT_MSG_DELCHAIN
:
3681 trans
->ctx
.table
->use
++;
3682 list_add_tail_rcu(&trans
->ctx
.chain
->list
,
3683 &trans
->ctx
.table
->chains
);
3684 nft_trans_destroy(trans
);
3686 case NFT_MSG_NEWRULE
:
3687 trans
->ctx
.chain
->use
--;
3688 list_del_rcu(&nft_trans_rule(trans
)->list
);
3690 case NFT_MSG_DELRULE
:
3691 trans
->ctx
.chain
->use
++;
3692 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3693 nft_trans_destroy(trans
);
3695 case NFT_MSG_NEWSET
:
3696 trans
->ctx
.table
->use
--;
3697 list_del_rcu(&nft_trans_set(trans
)->list
);
3699 case NFT_MSG_DELSET
:
3700 trans
->ctx
.table
->use
++;
3701 list_add_tail_rcu(&nft_trans_set(trans
)->list
,
3702 &trans
->ctx
.table
->sets
);
3703 nft_trans_destroy(trans
);
3705 case NFT_MSG_NEWSETELEM
:
3706 nft_trans_elem_set(trans
)->nelems
--;
3707 set
= nft_trans_elem_set(trans
);
3708 set
->ops
->get(set
, &nft_trans_elem(trans
));
3709 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3710 nft_trans_destroy(trans
);
3712 case NFT_MSG_DELSETELEM
:
3713 nft_trans_elem_set(trans
)->nelems
++;
3714 nft_trans_destroy(trans
);
3721 list_for_each_entry_safe_reverse(trans
, next
,
3722 &net
->nft
.commit_list
, list
) {
3723 list_del(&trans
->list
);
3724 nf_tables_abort_release(trans
);
3730 static const struct nfnetlink_subsystem nf_tables_subsys
= {
3731 .name
= "nf_tables",
3732 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
3733 .cb_count
= NFT_MSG_MAX
,
3735 .commit
= nf_tables_commit
,
3736 .abort
= nf_tables_abort
,
3739 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
3740 enum nft_chain_type type
)
3742 const struct nft_base_chain
*basechain
;
3744 if (chain
->flags
& NFT_BASE_CHAIN
) {
3745 basechain
= nft_base_chain(chain
);
3746 if (basechain
->type
->type
!= type
)
3751 EXPORT_SYMBOL_GPL(nft_chain_validate_dependency
);
3754 * Loop detection - walk through the ruleset beginning at the destination chain
3755 * of a new jump until either the source chain is reached (loop) or all
3756 * reachable chains have been traversed.
3758 * The loop check is performed whenever a new jump verdict is added to an
3759 * expression or verdict map or a verdict map is bound to a new chain.
3762 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3763 const struct nft_chain
*chain
);
3765 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
3766 const struct nft_set
*set
,
3767 const struct nft_set_iter
*iter
,
3768 const struct nft_set_elem
*elem
)
3770 if (elem
->flags
& NFT_SET_ELEM_INTERVAL_END
)
3773 switch (elem
->data
.verdict
) {
3776 return nf_tables_check_loops(ctx
, elem
->data
.chain
);
3782 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3783 const struct nft_chain
*chain
)
3785 const struct nft_rule
*rule
;
3786 const struct nft_expr
*expr
, *last
;
3787 const struct nft_set
*set
;
3788 struct nft_set_binding
*binding
;
3789 struct nft_set_iter iter
;
3791 if (ctx
->chain
== chain
)
3794 list_for_each_entry(rule
, &chain
->rules
, list
) {
3795 nft_rule_for_each_expr(expr
, last
, rule
) {
3796 const struct nft_data
*data
= NULL
;
3799 if (!expr
->ops
->validate
)
3802 err
= expr
->ops
->validate(ctx
, expr
, &data
);
3809 switch (data
->verdict
) {
3812 err
= nf_tables_check_loops(ctx
, data
->chain
);
3821 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
3822 if (!(set
->flags
& NFT_SET_MAP
) ||
3823 set
->dtype
!= NFT_DATA_VERDICT
)
3826 list_for_each_entry(binding
, &set
->bindings
, list
) {
3827 if (binding
->chain
!= chain
)
3833 iter
.fn
= nf_tables_loop_check_setelem
;
3835 set
->ops
->walk(ctx
, set
, &iter
);
3845 * nft_validate_input_register - validate an expressions' input register
3847 * @reg: the register number
3849 * Validate that the input register is one of the general purpose
3852 int nft_validate_input_register(enum nft_registers reg
)
3854 if (reg
<= NFT_REG_VERDICT
)
3856 if (reg
> NFT_REG_MAX
)
3860 EXPORT_SYMBOL_GPL(nft_validate_input_register
);
3863 * nft_validate_output_register - validate an expressions' output register
3865 * @reg: the register number
3867 * Validate that the output register is one of the general purpose
3868 * registers or the verdict register.
3870 int nft_validate_output_register(enum nft_registers reg
)
3872 if (reg
< NFT_REG_VERDICT
)
3874 if (reg
> NFT_REG_MAX
)
3878 EXPORT_SYMBOL_GPL(nft_validate_output_register
);
3881 * nft_validate_data_load - validate an expressions' data load
3883 * @ctx: context of the expression performing the load
3884 * @reg: the destination register number
3885 * @data: the data to load
3886 * @type: the data type
3888 * Validate that a data load uses the appropriate data type for
3889 * the destination register. A value of NULL for the data means
3890 * that its runtime gathered data, which is always of type
3893 int nft_validate_data_load(const struct nft_ctx
*ctx
, enum nft_registers reg
,
3894 const struct nft_data
*data
,
3895 enum nft_data_types type
)
3900 case NFT_REG_VERDICT
:
3901 if (data
== NULL
|| type
!= NFT_DATA_VERDICT
)
3904 if (data
->verdict
== NFT_GOTO
|| data
->verdict
== NFT_JUMP
) {
3905 err
= nf_tables_check_loops(ctx
, data
->chain
);
3909 if (ctx
->chain
->level
+ 1 > data
->chain
->level
) {
3910 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
3912 data
->chain
->level
= ctx
->chain
->level
+ 1;
3918 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
3923 EXPORT_SYMBOL_GPL(nft_validate_data_load
);
3925 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
3926 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
3927 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
3928 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
3931 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3932 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3934 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
3935 struct nft_chain
*chain
;
3938 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
);
3942 if (!tb
[NFTA_VERDICT_CODE
])
3944 data
->verdict
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
3946 switch (data
->verdict
) {
3948 switch (data
->verdict
& NF_VERDICT_MASK
) {
3960 desc
->len
= sizeof(data
->verdict
);
3964 if (!tb
[NFTA_VERDICT_CHAIN
])
3966 chain
= nf_tables_chain_lookup(ctx
->table
,
3967 tb
[NFTA_VERDICT_CHAIN
]);
3969 return PTR_ERR(chain
);
3970 if (chain
->flags
& NFT_BASE_CHAIN
)
3974 data
->chain
= chain
;
3975 desc
->len
= sizeof(data
);
3979 desc
->type
= NFT_DATA_VERDICT
;
3983 static void nft_verdict_uninit(const struct nft_data
*data
)
3985 switch (data
->verdict
) {
3993 static int nft_verdict_dump(struct sk_buff
*skb
, const struct nft_data
*data
)
3995 struct nlattr
*nest
;
3997 nest
= nla_nest_start(skb
, NFTA_DATA_VERDICT
);
3999 goto nla_put_failure
;
4001 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(data
->verdict
)))
4002 goto nla_put_failure
;
4004 switch (data
->verdict
) {
4007 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
, data
->chain
->name
))
4008 goto nla_put_failure
;
4010 nla_nest_end(skb
, nest
);
4017 static int nft_value_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
4018 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
4025 if (len
> sizeof(data
->data
))
4028 nla_memcpy(data
->data
, nla
, sizeof(data
->data
));
4029 desc
->type
= NFT_DATA_VALUE
;
4034 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
4037 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
4040 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
4041 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
,
4042 .len
= FIELD_SIZEOF(struct nft_data
, data
) },
4043 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
4047 * nft_data_init - parse nf_tables data netlink attributes
4049 * @ctx: context of the expression using the data
4050 * @data: destination struct nft_data
4051 * @desc: data description
4052 * @nla: netlink attribute containing data
4054 * Parse the netlink data attributes and initialize a struct nft_data.
4055 * The type and length of data are returned in the data description.
4057 * The caller can indicate that it only wants to accept data of type
4058 * NFT_DATA_VALUE by passing NULL for the ctx argument.
4060 int nft_data_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
4061 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
4063 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
4066 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
);
4070 if (tb
[NFTA_DATA_VALUE
])
4071 return nft_value_init(ctx
, data
, desc
, tb
[NFTA_DATA_VALUE
]);
4072 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
4073 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
4076 EXPORT_SYMBOL_GPL(nft_data_init
);
4079 * nft_data_uninit - release a nft_data item
4081 * @data: struct nft_data to release
4082 * @type: type of data
4084 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
4085 * all others need to be released by calling this function.
4087 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
)
4090 case NFT_DATA_VALUE
:
4092 case NFT_DATA_VERDICT
:
4093 return nft_verdict_uninit(data
);
4098 EXPORT_SYMBOL_GPL(nft_data_uninit
);
4100 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
4101 enum nft_data_types type
, unsigned int len
)
4103 struct nlattr
*nest
;
4106 nest
= nla_nest_start(skb
, attr
);
4111 case NFT_DATA_VALUE
:
4112 err
= nft_value_dump(skb
, data
, len
);
4114 case NFT_DATA_VERDICT
:
4115 err
= nft_verdict_dump(skb
, data
);
4122 nla_nest_end(skb
, nest
);
4125 EXPORT_SYMBOL_GPL(nft_data_dump
);
4127 static int nf_tables_init_net(struct net
*net
)
4129 INIT_LIST_HEAD(&net
->nft
.af_info
);
4130 INIT_LIST_HEAD(&net
->nft
.commit_list
);
4131 net
->nft
.base_seq
= 1;
4135 static struct pernet_operations nf_tables_net_ops
= {
4136 .init
= nf_tables_init_net
,
4139 static int __init
nf_tables_module_init(void)
4143 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
4150 err
= nf_tables_core_module_init();
4154 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
4158 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4159 return register_pernet_subsys(&nf_tables_net_ops
);
4161 nf_tables_core_module_exit();
4168 static void __exit
nf_tables_module_exit(void)
4170 unregister_pernet_subsys(&nf_tables_net_ops
);
4171 nfnetlink_subsys_unregister(&nf_tables_subsys
);
4173 nf_tables_core_module_exit();
4177 module_init(nf_tables_module_init
);
4178 module_exit(nf_tables_module_exit
);
4180 MODULE_LICENSE("GPL");
4181 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4182 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);