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
);
134 static struct nft_table
*nft_table_lookup(const struct nft_af_info
*afi
,
135 const struct nlattr
*nla
)
137 struct nft_table
*table
;
139 list_for_each_entry(table
, &afi
->tables
, list
) {
140 if (!nla_strcmp(nla
, table
->name
))
146 static struct nft_table
*nf_tables_table_lookup(const struct nft_af_info
*afi
,
147 const struct nlattr
*nla
)
149 struct nft_table
*table
;
152 return ERR_PTR(-EINVAL
);
154 table
= nft_table_lookup(afi
, nla
);
158 return ERR_PTR(-ENOENT
);
161 static inline u64
nf_tables_alloc_handle(struct nft_table
*table
)
163 return ++table
->hgenerator
;
166 static const struct nf_chain_type
*chain_type
[AF_MAX
][NFT_CHAIN_T_MAX
];
168 static const struct nf_chain_type
*
169 __nf_tables_chain_type_lookup(int family
, const struct nlattr
*nla
)
173 for (i
= 0; i
< NFT_CHAIN_T_MAX
; i
++) {
174 if (chain_type
[family
][i
] != NULL
&&
175 !nla_strcmp(nla
, chain_type
[family
][i
]->name
))
176 return chain_type
[family
][i
];
181 static const struct nf_chain_type
*
182 nf_tables_chain_type_lookup(const struct nft_af_info
*afi
,
183 const struct nlattr
*nla
,
186 const struct nf_chain_type
*type
;
188 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
191 #ifdef CONFIG_MODULES
193 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
194 request_module("nft-chain-%u-%.*s", afi
->family
,
195 nla_len(nla
), (const char *)nla_data(nla
));
196 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
197 type
= __nf_tables_chain_type_lookup(afi
->family
, nla
);
199 return ERR_PTR(-EAGAIN
);
202 return ERR_PTR(-ENOENT
);
205 static const struct nla_policy nft_table_policy
[NFTA_TABLE_MAX
+ 1] = {
206 [NFTA_TABLE_NAME
] = { .type
= NLA_STRING
},
207 [NFTA_TABLE_FLAGS
] = { .type
= NLA_U32
},
210 static int nf_tables_fill_table_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
211 int event
, u32 flags
, int family
,
212 const struct nft_table
*table
)
214 struct nlmsghdr
*nlh
;
215 struct nfgenmsg
*nfmsg
;
217 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
218 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
220 goto nla_put_failure
;
222 nfmsg
= nlmsg_data(nlh
);
223 nfmsg
->nfgen_family
= family
;
224 nfmsg
->version
= NFNETLINK_V0
;
227 if (nla_put_string(skb
, NFTA_TABLE_NAME
, table
->name
) ||
228 nla_put_be32(skb
, NFTA_TABLE_FLAGS
, htonl(table
->flags
)) ||
229 nla_put_be32(skb
, NFTA_TABLE_USE
, htonl(table
->use
)))
230 goto nla_put_failure
;
232 return nlmsg_end(skb
, nlh
);
235 nlmsg_trim(skb
, nlh
);
239 static int nf_tables_table_notify(const struct nft_ctx
*ctx
, int event
)
245 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
249 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
253 err
= nf_tables_fill_table_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
254 ctx
->afi
->family
, ctx
->table
);
260 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
261 ctx
->report
, GFP_KERNEL
);
264 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
270 static int nf_tables_dump_tables(struct sk_buff
*skb
,
271 struct netlink_callback
*cb
)
273 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
274 const struct nft_af_info
*afi
;
275 const struct nft_table
*table
;
276 unsigned int idx
= 0, s_idx
= cb
->args
[0];
277 struct net
*net
= sock_net(skb
->sk
);
278 int family
= nfmsg
->nfgen_family
;
281 cb
->seq
= net
->nft
.base_seq
;
283 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
284 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
287 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
291 memset(&cb
->args
[1], 0,
292 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
293 if (nf_tables_fill_table_info(skb
,
294 NETLINK_CB(cb
->skb
).portid
,
298 afi
->family
, table
) < 0)
301 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
312 /* Internal table flags */
313 #define NFT_TABLE_INACTIVE (1 << 15)
315 static int nf_tables_gettable(struct sock
*nlsk
, struct sk_buff
*skb
,
316 const struct nlmsghdr
*nlh
,
317 const struct nlattr
* const nla
[])
319 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
320 const struct nft_af_info
*afi
;
321 const struct nft_table
*table
;
322 struct sk_buff
*skb2
;
323 struct net
*net
= sock_net(skb
->sk
);
324 int family
= nfmsg
->nfgen_family
;
327 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
328 struct netlink_dump_control c
= {
329 .dump
= nf_tables_dump_tables
,
331 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
334 afi
= nf_tables_afinfo_lookup(net
, family
, false);
338 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
340 return PTR_ERR(table
);
341 if (table
->flags
& NFT_TABLE_INACTIVE
)
344 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
348 err
= nf_tables_fill_table_info(skb2
, NETLINK_CB(skb
).portid
,
349 nlh
->nlmsg_seq
, NFT_MSG_NEWTABLE
, 0,
354 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
361 static int nf_tables_table_enable(const struct nft_af_info
*afi
,
362 struct nft_table
*table
)
364 struct nft_chain
*chain
;
367 list_for_each_entry(chain
, &table
->chains
, list
) {
368 if (!(chain
->flags
& NFT_BASE_CHAIN
))
371 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
379 list_for_each_entry(chain
, &table
->chains
, list
) {
380 if (!(chain
->flags
& NFT_BASE_CHAIN
))
386 nf_unregister_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
391 static void nf_tables_table_disable(const struct nft_af_info
*afi
,
392 struct nft_table
*table
)
394 struct nft_chain
*chain
;
396 list_for_each_entry(chain
, &table
->chains
, list
) {
397 if (chain
->flags
& NFT_BASE_CHAIN
)
398 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
403 static int nf_tables_updtable(struct nft_ctx
*ctx
)
405 struct nft_trans
*trans
;
409 if (!ctx
->nla
[NFTA_TABLE_FLAGS
])
412 flags
= ntohl(nla_get_be32(ctx
->nla
[NFTA_TABLE_FLAGS
]));
413 if (flags
& ~NFT_TABLE_F_DORMANT
)
416 if (flags
== ctx
->table
->flags
)
419 trans
= nft_trans_alloc(ctx
, NFT_MSG_NEWTABLE
,
420 sizeof(struct nft_trans_table
));
424 if ((flags
& NFT_TABLE_F_DORMANT
) &&
425 !(ctx
->table
->flags
& NFT_TABLE_F_DORMANT
)) {
426 nft_trans_table_enable(trans
) = false;
427 } else if (!(flags
& NFT_TABLE_F_DORMANT
) &&
428 ctx
->table
->flags
& NFT_TABLE_F_DORMANT
) {
429 ret
= nf_tables_table_enable(ctx
->afi
, ctx
->table
);
431 ctx
->table
->flags
&= ~NFT_TABLE_F_DORMANT
;
432 nft_trans_table_enable(trans
) = true;
438 nft_trans_table_update(trans
) = true;
439 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
442 nft_trans_destroy(trans
);
446 static int nft_trans_table_add(struct nft_ctx
*ctx
, int msg_type
)
448 struct nft_trans
*trans
;
450 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_table
));
454 if (msg_type
== NFT_MSG_NEWTABLE
)
455 ctx
->table
->flags
|= NFT_TABLE_INACTIVE
;
457 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
461 static int nf_tables_newtable(struct sock
*nlsk
, struct sk_buff
*skb
,
462 const struct nlmsghdr
*nlh
,
463 const struct nlattr
* const nla
[])
465 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
466 const struct nlattr
*name
;
467 struct nft_af_info
*afi
;
468 struct nft_table
*table
;
469 struct net
*net
= sock_net(skb
->sk
);
470 int family
= nfmsg
->nfgen_family
;
475 afi
= nf_tables_afinfo_lookup(net
, family
, true);
479 name
= nla
[NFTA_TABLE_NAME
];
480 table
= nf_tables_table_lookup(afi
, name
);
482 if (PTR_ERR(table
) != -ENOENT
)
483 return PTR_ERR(table
);
488 if (table
->flags
& NFT_TABLE_INACTIVE
)
490 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
492 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
495 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
496 return nf_tables_updtable(&ctx
);
499 if (nla
[NFTA_TABLE_FLAGS
]) {
500 flags
= ntohl(nla_get_be32(nla
[NFTA_TABLE_FLAGS
]));
501 if (flags
& ~NFT_TABLE_F_DORMANT
)
505 if (!try_module_get(afi
->owner
))
506 return -EAFNOSUPPORT
;
508 table
= kzalloc(sizeof(*table
) + nla_len(name
), GFP_KERNEL
);
510 module_put(afi
->owner
);
514 nla_strlcpy(table
->name
, name
, nla_len(name
));
515 INIT_LIST_HEAD(&table
->chains
);
516 INIT_LIST_HEAD(&table
->sets
);
517 table
->flags
= flags
;
519 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
520 err
= nft_trans_table_add(&ctx
, NFT_MSG_NEWTABLE
);
523 module_put(afi
->owner
);
526 list_add_tail_rcu(&table
->list
, &afi
->tables
);
530 static int nf_tables_deltable(struct sock
*nlsk
, struct sk_buff
*skb
,
531 const struct nlmsghdr
*nlh
,
532 const struct nlattr
* const nla
[])
534 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
535 struct nft_af_info
*afi
;
536 struct nft_table
*table
;
537 struct net
*net
= sock_net(skb
->sk
);
538 int family
= nfmsg
->nfgen_family
, err
;
541 afi
= nf_tables_afinfo_lookup(net
, family
, false);
545 table
= nf_tables_table_lookup(afi
, nla
[NFTA_TABLE_NAME
]);
547 return PTR_ERR(table
);
548 if (table
->flags
& NFT_TABLE_INACTIVE
)
553 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
554 err
= nft_trans_table_add(&ctx
, NFT_MSG_DELTABLE
);
558 list_del_rcu(&table
->list
);
562 static void nf_tables_table_destroy(struct nft_ctx
*ctx
)
564 BUG_ON(ctx
->table
->use
> 0);
567 module_put(ctx
->afi
->owner
);
570 int nft_register_chain_type(const struct nf_chain_type
*ctype
)
574 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
575 if (chain_type
[ctype
->family
][ctype
->type
] != NULL
) {
579 chain_type
[ctype
->family
][ctype
->type
] = ctype
;
581 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
584 EXPORT_SYMBOL_GPL(nft_register_chain_type
);
586 void nft_unregister_chain_type(const struct nf_chain_type
*ctype
)
588 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
589 chain_type
[ctype
->family
][ctype
->type
] = NULL
;
590 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
592 EXPORT_SYMBOL_GPL(nft_unregister_chain_type
);
598 static struct nft_chain
*
599 nf_tables_chain_lookup_byhandle(const struct nft_table
*table
, u64 handle
)
601 struct nft_chain
*chain
;
603 list_for_each_entry(chain
, &table
->chains
, list
) {
604 if (chain
->handle
== handle
)
608 return ERR_PTR(-ENOENT
);
611 static struct nft_chain
*nf_tables_chain_lookup(const struct nft_table
*table
,
612 const struct nlattr
*nla
)
614 struct nft_chain
*chain
;
617 return ERR_PTR(-EINVAL
);
619 list_for_each_entry(chain
, &table
->chains
, list
) {
620 if (!nla_strcmp(nla
, chain
->name
))
624 return ERR_PTR(-ENOENT
);
627 static const struct nla_policy nft_chain_policy
[NFTA_CHAIN_MAX
+ 1] = {
628 [NFTA_CHAIN_TABLE
] = { .type
= NLA_STRING
},
629 [NFTA_CHAIN_HANDLE
] = { .type
= NLA_U64
},
630 [NFTA_CHAIN_NAME
] = { .type
= NLA_STRING
,
631 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
632 [NFTA_CHAIN_HOOK
] = { .type
= NLA_NESTED
},
633 [NFTA_CHAIN_POLICY
] = { .type
= NLA_U32
},
634 [NFTA_CHAIN_TYPE
] = { .type
= NLA_STRING
},
635 [NFTA_CHAIN_COUNTERS
] = { .type
= NLA_NESTED
},
638 static const struct nla_policy nft_hook_policy
[NFTA_HOOK_MAX
+ 1] = {
639 [NFTA_HOOK_HOOKNUM
] = { .type
= NLA_U32
},
640 [NFTA_HOOK_PRIORITY
] = { .type
= NLA_U32
},
643 static int nft_dump_stats(struct sk_buff
*skb
, struct nft_stats __percpu
*stats
)
645 struct nft_stats
*cpu_stats
, total
;
651 memset(&total
, 0, sizeof(total
));
652 for_each_possible_cpu(cpu
) {
653 cpu_stats
= per_cpu_ptr(stats
, cpu
);
655 seq
= u64_stats_fetch_begin_irq(&cpu_stats
->syncp
);
656 pkts
= cpu_stats
->pkts
;
657 bytes
= cpu_stats
->bytes
;
658 } while (u64_stats_fetch_retry_irq(&cpu_stats
->syncp
, seq
));
660 total
.bytes
+= bytes
;
662 nest
= nla_nest_start(skb
, NFTA_CHAIN_COUNTERS
);
664 goto nla_put_failure
;
666 if (nla_put_be64(skb
, NFTA_COUNTER_PACKETS
, cpu_to_be64(total
.pkts
)) ||
667 nla_put_be64(skb
, NFTA_COUNTER_BYTES
, cpu_to_be64(total
.bytes
)))
668 goto nla_put_failure
;
670 nla_nest_end(skb
, nest
);
677 static int nf_tables_fill_chain_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
678 int event
, u32 flags
, int family
,
679 const struct nft_table
*table
,
680 const struct nft_chain
*chain
)
682 struct nlmsghdr
*nlh
;
683 struct nfgenmsg
*nfmsg
;
685 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
686 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
), flags
);
688 goto nla_put_failure
;
690 nfmsg
= nlmsg_data(nlh
);
691 nfmsg
->nfgen_family
= family
;
692 nfmsg
->version
= NFNETLINK_V0
;
695 if (nla_put_string(skb
, NFTA_CHAIN_TABLE
, table
->name
))
696 goto nla_put_failure
;
697 if (nla_put_be64(skb
, NFTA_CHAIN_HANDLE
, cpu_to_be64(chain
->handle
)))
698 goto nla_put_failure
;
699 if (nla_put_string(skb
, NFTA_CHAIN_NAME
, chain
->name
))
700 goto nla_put_failure
;
702 if (chain
->flags
& NFT_BASE_CHAIN
) {
703 const struct nft_base_chain
*basechain
= nft_base_chain(chain
);
704 const struct nf_hook_ops
*ops
= &basechain
->ops
[0];
707 nest
= nla_nest_start(skb
, NFTA_CHAIN_HOOK
);
709 goto nla_put_failure
;
710 if (nla_put_be32(skb
, NFTA_HOOK_HOOKNUM
, htonl(ops
->hooknum
)))
711 goto nla_put_failure
;
712 if (nla_put_be32(skb
, NFTA_HOOK_PRIORITY
, htonl(ops
->priority
)))
713 goto nla_put_failure
;
714 nla_nest_end(skb
, nest
);
716 if (nla_put_be32(skb
, NFTA_CHAIN_POLICY
,
717 htonl(basechain
->policy
)))
718 goto nla_put_failure
;
720 if (nla_put_string(skb
, NFTA_CHAIN_TYPE
, basechain
->type
->name
))
721 goto nla_put_failure
;
723 if (nft_dump_stats(skb
, nft_base_chain(chain
)->stats
))
724 goto nla_put_failure
;
727 if (nla_put_be32(skb
, NFTA_CHAIN_USE
, htonl(chain
->use
)))
728 goto nla_put_failure
;
730 return nlmsg_end(skb
, nlh
);
733 nlmsg_trim(skb
, nlh
);
737 static int nf_tables_chain_notify(const struct nft_ctx
*ctx
, int event
)
743 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
747 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
751 err
= nf_tables_fill_chain_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
752 ctx
->afi
->family
, ctx
->table
,
759 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
760 ctx
->report
, GFP_KERNEL
);
763 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
769 static int nf_tables_dump_chains(struct sk_buff
*skb
,
770 struct netlink_callback
*cb
)
772 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
773 const struct nft_af_info
*afi
;
774 const struct nft_table
*table
;
775 const struct nft_chain
*chain
;
776 unsigned int idx
= 0, s_idx
= cb
->args
[0];
777 struct net
*net
= sock_net(skb
->sk
);
778 int family
= nfmsg
->nfgen_family
;
781 cb
->seq
= net
->nft
.base_seq
;
783 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
784 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
787 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
788 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
792 memset(&cb
->args
[1], 0,
793 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
794 if (nf_tables_fill_chain_info(skb
, NETLINK_CB(cb
->skb
).portid
,
798 afi
->family
, table
, chain
) < 0)
801 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
813 static int nf_tables_getchain(struct sock
*nlsk
, struct sk_buff
*skb
,
814 const struct nlmsghdr
*nlh
,
815 const struct nlattr
* const nla
[])
817 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
818 const struct nft_af_info
*afi
;
819 const struct nft_table
*table
;
820 const struct nft_chain
*chain
;
821 struct sk_buff
*skb2
;
822 struct net
*net
= sock_net(skb
->sk
);
823 int family
= nfmsg
->nfgen_family
;
826 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
827 struct netlink_dump_control c
= {
828 .dump
= nf_tables_dump_chains
,
830 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
833 afi
= nf_tables_afinfo_lookup(net
, family
, false);
837 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
839 return PTR_ERR(table
);
840 if (table
->flags
& NFT_TABLE_INACTIVE
)
843 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
845 return PTR_ERR(chain
);
846 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
849 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
853 err
= nf_tables_fill_chain_info(skb2
, NETLINK_CB(skb
).portid
,
854 nlh
->nlmsg_seq
, NFT_MSG_NEWCHAIN
, 0,
855 family
, table
, chain
);
859 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
866 static const struct nla_policy nft_counter_policy
[NFTA_COUNTER_MAX
+ 1] = {
867 [NFTA_COUNTER_PACKETS
] = { .type
= NLA_U64
},
868 [NFTA_COUNTER_BYTES
] = { .type
= NLA_U64
},
871 static struct nft_stats __percpu
*nft_stats_alloc(const struct nlattr
*attr
)
873 struct nlattr
*tb
[NFTA_COUNTER_MAX
+1];
874 struct nft_stats __percpu
*newstats
;
875 struct nft_stats
*stats
;
878 err
= nla_parse_nested(tb
, NFTA_COUNTER_MAX
, attr
, nft_counter_policy
);
882 if (!tb
[NFTA_COUNTER_BYTES
] || !tb
[NFTA_COUNTER_PACKETS
])
883 return ERR_PTR(-EINVAL
);
885 newstats
= netdev_alloc_pcpu_stats(struct nft_stats
);
886 if (newstats
== NULL
)
887 return ERR_PTR(-ENOMEM
);
889 /* Restore old counters on this cpu, no problem. Per-cpu statistics
890 * are not exposed to userspace.
892 stats
= this_cpu_ptr(newstats
);
893 stats
->bytes
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_BYTES
]));
894 stats
->pkts
= be64_to_cpu(nla_get_be64(tb
[NFTA_COUNTER_PACKETS
]));
899 static void nft_chain_stats_replace(struct nft_base_chain
*chain
,
900 struct nft_stats __percpu
*newstats
)
903 struct nft_stats __percpu
*oldstats
=
904 nft_dereference(chain
->stats
);
906 rcu_assign_pointer(chain
->stats
, newstats
);
908 free_percpu(oldstats
);
910 rcu_assign_pointer(chain
->stats
, newstats
);
913 static int nft_trans_chain_add(struct nft_ctx
*ctx
, int msg_type
)
915 struct nft_trans
*trans
;
917 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_chain
));
921 if (msg_type
== NFT_MSG_NEWCHAIN
)
922 ctx
->chain
->flags
|= NFT_CHAIN_INACTIVE
;
924 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
928 static void nf_tables_chain_destroy(struct nft_chain
*chain
)
930 BUG_ON(chain
->use
> 0);
932 if (chain
->flags
& NFT_BASE_CHAIN
) {
933 module_put(nft_base_chain(chain
)->type
->owner
);
934 free_percpu(nft_base_chain(chain
)->stats
);
935 kfree(nft_base_chain(chain
));
941 static int nf_tables_newchain(struct sock
*nlsk
, struct sk_buff
*skb
,
942 const struct nlmsghdr
*nlh
,
943 const struct nlattr
* const nla
[])
945 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
946 const struct nlattr
* uninitialized_var(name
);
947 struct nft_af_info
*afi
;
948 struct nft_table
*table
;
949 struct nft_chain
*chain
;
950 struct nft_base_chain
*basechain
= NULL
;
951 struct nlattr
*ha
[NFTA_HOOK_MAX
+ 1];
952 struct net
*net
= sock_net(skb
->sk
);
953 int family
= nfmsg
->nfgen_family
;
954 u8 policy
= NF_ACCEPT
;
957 struct nft_stats __percpu
*stats
;
962 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
964 afi
= nf_tables_afinfo_lookup(net
, family
, true);
968 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
970 return PTR_ERR(table
);
973 name
= nla
[NFTA_CHAIN_NAME
];
975 if (nla
[NFTA_CHAIN_HANDLE
]) {
976 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_CHAIN_HANDLE
]));
977 chain
= nf_tables_chain_lookup_byhandle(table
, handle
);
979 return PTR_ERR(chain
);
981 chain
= nf_tables_chain_lookup(table
, name
);
983 if (PTR_ERR(chain
) != -ENOENT
)
984 return PTR_ERR(chain
);
989 if (nla
[NFTA_CHAIN_POLICY
]) {
990 if ((chain
!= NULL
&&
991 !(chain
->flags
& NFT_BASE_CHAIN
)) ||
992 nla
[NFTA_CHAIN_HOOK
] == NULL
)
995 policy
= ntohl(nla_get_be32(nla
[NFTA_CHAIN_POLICY
]));
1005 if (chain
!= NULL
) {
1006 struct nft_stats
*stats
= NULL
;
1007 struct nft_trans
*trans
;
1009 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1011 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1013 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1016 if (nla
[NFTA_CHAIN_HANDLE
] && name
&&
1017 !IS_ERR(nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
])))
1020 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1021 if (!(chain
->flags
& NFT_BASE_CHAIN
))
1024 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1026 return PTR_ERR(stats
);
1029 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1030 trans
= nft_trans_alloc(&ctx
, NFT_MSG_NEWCHAIN
,
1031 sizeof(struct nft_trans_chain
));
1035 nft_trans_chain_stats(trans
) = stats
;
1036 nft_trans_chain_update(trans
) = true;
1038 if (nla
[NFTA_CHAIN_POLICY
])
1039 nft_trans_chain_policy(trans
) = policy
;
1041 nft_trans_chain_policy(trans
) = -1;
1043 if (nla
[NFTA_CHAIN_HANDLE
] && name
) {
1044 nla_strlcpy(nft_trans_chain_name(trans
), name
,
1045 NFT_CHAIN_MAXNAMELEN
);
1047 list_add_tail(&trans
->list
, &net
->nft
.commit_list
);
1051 if (table
->use
== UINT_MAX
)
1054 if (nla
[NFTA_CHAIN_HOOK
]) {
1055 const struct nf_chain_type
*type
;
1056 struct nf_hook_ops
*ops
;
1058 u32 hooknum
, priority
;
1060 type
= chain_type
[family
][NFT_CHAIN_T_DEFAULT
];
1061 if (nla
[NFTA_CHAIN_TYPE
]) {
1062 type
= nf_tables_chain_type_lookup(afi
,
1063 nla
[NFTA_CHAIN_TYPE
],
1066 return PTR_ERR(type
);
1069 err
= nla_parse_nested(ha
, NFTA_HOOK_MAX
, nla
[NFTA_CHAIN_HOOK
],
1073 if (ha
[NFTA_HOOK_HOOKNUM
] == NULL
||
1074 ha
[NFTA_HOOK_PRIORITY
] == NULL
)
1077 hooknum
= ntohl(nla_get_be32(ha
[NFTA_HOOK_HOOKNUM
]));
1078 if (hooknum
>= afi
->nhooks
)
1080 priority
= ntohl(nla_get_be32(ha
[NFTA_HOOK_PRIORITY
]));
1082 if (!(type
->hook_mask
& (1 << hooknum
)))
1084 if (!try_module_get(type
->owner
))
1086 hookfn
= type
->hooks
[hooknum
];
1088 basechain
= kzalloc(sizeof(*basechain
), GFP_KERNEL
);
1089 if (basechain
== NULL
)
1092 if (nla
[NFTA_CHAIN_COUNTERS
]) {
1093 stats
= nft_stats_alloc(nla
[NFTA_CHAIN_COUNTERS
]);
1094 if (IS_ERR(stats
)) {
1095 module_put(type
->owner
);
1097 return PTR_ERR(stats
);
1099 basechain
->stats
= stats
;
1101 stats
= netdev_alloc_pcpu_stats(struct nft_stats
);
1102 if (IS_ERR(stats
)) {
1103 module_put(type
->owner
);
1105 return PTR_ERR(stats
);
1107 rcu_assign_pointer(basechain
->stats
, stats
);
1110 basechain
->type
= type
;
1111 chain
= &basechain
->chain
;
1113 for (i
= 0; i
< afi
->nops
; i
++) {
1114 ops
= &basechain
->ops
[i
];
1116 ops
->owner
= afi
->owner
;
1117 ops
->hooknum
= hooknum
;
1118 ops
->priority
= priority
;
1120 ops
->hook
= afi
->hooks
[ops
->hooknum
];
1123 if (afi
->hook_ops_init
)
1124 afi
->hook_ops_init(ops
, i
);
1127 chain
->flags
|= NFT_BASE_CHAIN
;
1128 basechain
->policy
= policy
;
1130 chain
= kzalloc(sizeof(*chain
), GFP_KERNEL
);
1135 INIT_LIST_HEAD(&chain
->rules
);
1136 chain
->handle
= nf_tables_alloc_handle(table
);
1138 chain
->table
= table
;
1139 nla_strlcpy(chain
->name
, name
, NFT_CHAIN_MAXNAMELEN
);
1141 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1142 chain
->flags
& NFT_BASE_CHAIN
) {
1143 err
= nf_register_hooks(nft_base_chain(chain
)->ops
, afi
->nops
);
1148 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1149 err
= nft_trans_chain_add(&ctx
, NFT_MSG_NEWCHAIN
);
1154 list_add_tail_rcu(&chain
->list
, &table
->chains
);
1157 if (!(table
->flags
& NFT_TABLE_F_DORMANT
) &&
1158 chain
->flags
& NFT_BASE_CHAIN
) {
1159 nf_unregister_hooks(nft_base_chain(chain
)->ops
,
1163 nf_tables_chain_destroy(chain
);
1167 static int nf_tables_delchain(struct sock
*nlsk
, struct sk_buff
*skb
,
1168 const struct nlmsghdr
*nlh
,
1169 const struct nlattr
* const nla
[])
1171 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1172 struct nft_af_info
*afi
;
1173 struct nft_table
*table
;
1174 struct nft_chain
*chain
;
1175 struct net
*net
= sock_net(skb
->sk
);
1176 int family
= nfmsg
->nfgen_family
;
1180 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1182 return PTR_ERR(afi
);
1184 table
= nf_tables_table_lookup(afi
, nla
[NFTA_CHAIN_TABLE
]);
1186 return PTR_ERR(table
);
1187 if (table
->flags
& NFT_TABLE_INACTIVE
)
1190 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_CHAIN_NAME
]);
1192 return PTR_ERR(chain
);
1193 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1198 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1199 err
= nft_trans_chain_add(&ctx
, NFT_MSG_DELCHAIN
);
1204 list_del_rcu(&chain
->list
);
1213 * nft_register_expr - register nf_tables expr type
1216 * Registers the expr type for use with nf_tables. Returns zero on
1217 * success or a negative errno code otherwise.
1219 int nft_register_expr(struct nft_expr_type
*type
)
1221 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1222 if (type
->family
== NFPROTO_UNSPEC
)
1223 list_add_tail_rcu(&type
->list
, &nf_tables_expressions
);
1225 list_add_rcu(&type
->list
, &nf_tables_expressions
);
1226 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1229 EXPORT_SYMBOL_GPL(nft_register_expr
);
1232 * nft_unregister_expr - unregister nf_tables expr type
1235 * Unregisters the expr typefor use with nf_tables.
1237 void nft_unregister_expr(struct nft_expr_type
*type
)
1239 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1240 list_del_rcu(&type
->list
);
1241 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1243 EXPORT_SYMBOL_GPL(nft_unregister_expr
);
1245 static const struct nft_expr_type
*__nft_expr_type_get(u8 family
,
1248 const struct nft_expr_type
*type
;
1250 list_for_each_entry(type
, &nf_tables_expressions
, list
) {
1251 if (!nla_strcmp(nla
, type
->name
) &&
1252 (!type
->family
|| type
->family
== family
))
1258 static const struct nft_expr_type
*nft_expr_type_get(u8 family
,
1261 const struct nft_expr_type
*type
;
1264 return ERR_PTR(-EINVAL
);
1266 type
= __nft_expr_type_get(family
, nla
);
1267 if (type
!= NULL
&& try_module_get(type
->owner
))
1270 #ifdef CONFIG_MODULES
1272 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1273 request_module("nft-expr-%u-%.*s", family
,
1274 nla_len(nla
), (char *)nla_data(nla
));
1275 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1276 if (__nft_expr_type_get(family
, nla
))
1277 return ERR_PTR(-EAGAIN
);
1279 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1280 request_module("nft-expr-%.*s",
1281 nla_len(nla
), (char *)nla_data(nla
));
1282 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1283 if (__nft_expr_type_get(family
, nla
))
1284 return ERR_PTR(-EAGAIN
);
1287 return ERR_PTR(-ENOENT
);
1290 static const struct nla_policy nft_expr_policy
[NFTA_EXPR_MAX
+ 1] = {
1291 [NFTA_EXPR_NAME
] = { .type
= NLA_STRING
},
1292 [NFTA_EXPR_DATA
] = { .type
= NLA_NESTED
},
1295 static int nf_tables_fill_expr_info(struct sk_buff
*skb
,
1296 const struct nft_expr
*expr
)
1298 if (nla_put_string(skb
, NFTA_EXPR_NAME
, expr
->ops
->type
->name
))
1299 goto nla_put_failure
;
1301 if (expr
->ops
->dump
) {
1302 struct nlattr
*data
= nla_nest_start(skb
, NFTA_EXPR_DATA
);
1304 goto nla_put_failure
;
1305 if (expr
->ops
->dump(skb
, expr
) < 0)
1306 goto nla_put_failure
;
1307 nla_nest_end(skb
, data
);
1316 struct nft_expr_info
{
1317 const struct nft_expr_ops
*ops
;
1318 struct nlattr
*tb
[NFT_EXPR_MAXATTR
+ 1];
1321 static int nf_tables_expr_parse(const struct nft_ctx
*ctx
,
1322 const struct nlattr
*nla
,
1323 struct nft_expr_info
*info
)
1325 const struct nft_expr_type
*type
;
1326 const struct nft_expr_ops
*ops
;
1327 struct nlattr
*tb
[NFTA_EXPR_MAX
+ 1];
1330 err
= nla_parse_nested(tb
, NFTA_EXPR_MAX
, nla
, nft_expr_policy
);
1334 type
= nft_expr_type_get(ctx
->afi
->family
, tb
[NFTA_EXPR_NAME
]);
1336 return PTR_ERR(type
);
1338 if (tb
[NFTA_EXPR_DATA
]) {
1339 err
= nla_parse_nested(info
->tb
, type
->maxattr
,
1340 tb
[NFTA_EXPR_DATA
], type
->policy
);
1344 memset(info
->tb
, 0, sizeof(info
->tb
[0]) * (type
->maxattr
+ 1));
1346 if (type
->select_ops
!= NULL
) {
1347 ops
= type
->select_ops(ctx
,
1348 (const struct nlattr
* const *)info
->tb
);
1360 module_put(type
->owner
);
1364 static int nf_tables_newexpr(const struct nft_ctx
*ctx
,
1365 const struct nft_expr_info
*info
,
1366 struct nft_expr
*expr
)
1368 const struct nft_expr_ops
*ops
= info
->ops
;
1373 err
= ops
->init(ctx
, expr
, (const struct nlattr
**)info
->tb
);
1385 static void nf_tables_expr_destroy(const struct nft_ctx
*ctx
,
1386 struct nft_expr
*expr
)
1388 if (expr
->ops
->destroy
)
1389 expr
->ops
->destroy(ctx
, expr
);
1390 module_put(expr
->ops
->type
->owner
);
1397 static struct nft_rule
*__nf_tables_rule_lookup(const struct nft_chain
*chain
,
1400 struct nft_rule
*rule
;
1402 // FIXME: this sucks
1403 list_for_each_entry(rule
, &chain
->rules
, list
) {
1404 if (handle
== rule
->handle
)
1408 return ERR_PTR(-ENOENT
);
1411 static struct nft_rule
*nf_tables_rule_lookup(const struct nft_chain
*chain
,
1412 const struct nlattr
*nla
)
1415 return ERR_PTR(-EINVAL
);
1417 return __nf_tables_rule_lookup(chain
, be64_to_cpu(nla_get_be64(nla
)));
1420 static const struct nla_policy nft_rule_policy
[NFTA_RULE_MAX
+ 1] = {
1421 [NFTA_RULE_TABLE
] = { .type
= NLA_STRING
},
1422 [NFTA_RULE_CHAIN
] = { .type
= NLA_STRING
,
1423 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
1424 [NFTA_RULE_HANDLE
] = { .type
= NLA_U64
},
1425 [NFTA_RULE_EXPRESSIONS
] = { .type
= NLA_NESTED
},
1426 [NFTA_RULE_COMPAT
] = { .type
= NLA_NESTED
},
1427 [NFTA_RULE_POSITION
] = { .type
= NLA_U64
},
1428 [NFTA_RULE_USERDATA
] = { .type
= NLA_BINARY
,
1429 .len
= NFT_USERDATA_MAXLEN
},
1432 static int nf_tables_fill_rule_info(struct sk_buff
*skb
, u32 portid
, u32 seq
,
1433 int event
, u32 flags
, int family
,
1434 const struct nft_table
*table
,
1435 const struct nft_chain
*chain
,
1436 const struct nft_rule
*rule
)
1438 struct nlmsghdr
*nlh
;
1439 struct nfgenmsg
*nfmsg
;
1440 const struct nft_expr
*expr
, *next
;
1441 struct nlattr
*list
;
1442 const struct nft_rule
*prule
;
1443 int type
= event
| NFNL_SUBSYS_NFTABLES
<< 8;
1445 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(struct nfgenmsg
),
1448 goto nla_put_failure
;
1450 nfmsg
= nlmsg_data(nlh
);
1451 nfmsg
->nfgen_family
= family
;
1452 nfmsg
->version
= NFNETLINK_V0
;
1455 if (nla_put_string(skb
, NFTA_RULE_TABLE
, table
->name
))
1456 goto nla_put_failure
;
1457 if (nla_put_string(skb
, NFTA_RULE_CHAIN
, chain
->name
))
1458 goto nla_put_failure
;
1459 if (nla_put_be64(skb
, NFTA_RULE_HANDLE
, cpu_to_be64(rule
->handle
)))
1460 goto nla_put_failure
;
1462 if ((event
!= NFT_MSG_DELRULE
) && (rule
->list
.prev
!= &chain
->rules
)) {
1463 prule
= list_entry(rule
->list
.prev
, struct nft_rule
, list
);
1464 if (nla_put_be64(skb
, NFTA_RULE_POSITION
,
1465 cpu_to_be64(prule
->handle
)))
1466 goto nla_put_failure
;
1469 list
= nla_nest_start(skb
, NFTA_RULE_EXPRESSIONS
);
1471 goto nla_put_failure
;
1472 nft_rule_for_each_expr(expr
, next
, rule
) {
1473 struct nlattr
*elem
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
1475 goto nla_put_failure
;
1476 if (nf_tables_fill_expr_info(skb
, expr
) < 0)
1477 goto nla_put_failure
;
1478 nla_nest_end(skb
, elem
);
1480 nla_nest_end(skb
, list
);
1483 nla_put(skb
, NFTA_RULE_USERDATA
, rule
->ulen
, nft_userdata(rule
)))
1484 goto nla_put_failure
;
1486 return nlmsg_end(skb
, nlh
);
1489 nlmsg_trim(skb
, nlh
);
1493 static int nf_tables_rule_notify(const struct nft_ctx
*ctx
,
1494 const struct nft_rule
*rule
,
1497 struct sk_buff
*skb
;
1501 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
1505 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
1509 err
= nf_tables_fill_rule_info(skb
, ctx
->portid
, ctx
->seq
, event
, 0,
1510 ctx
->afi
->family
, ctx
->table
,
1517 err
= nfnetlink_send(skb
, ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1518 ctx
->report
, GFP_KERNEL
);
1521 nfnetlink_set_err(ctx
->net
, ctx
->portid
, NFNLGRP_NFTABLES
,
1528 nft_rule_is_active(struct net
*net
, const struct nft_rule
*rule
)
1530 return (rule
->genmask
& (1 << net
->nft
.gencursor
)) == 0;
1533 static inline int gencursor_next(struct net
*net
)
1535 return net
->nft
.gencursor
+1 == 1 ? 1 : 0;
1539 nft_rule_is_active_next(struct net
*net
, const struct nft_rule
*rule
)
1541 return (rule
->genmask
& (1 << gencursor_next(net
))) == 0;
1545 nft_rule_activate_next(struct net
*net
, struct nft_rule
*rule
)
1547 /* Now inactive, will be active in the future */
1548 rule
->genmask
= (1 << net
->nft
.gencursor
);
1552 nft_rule_disactivate_next(struct net
*net
, struct nft_rule
*rule
)
1554 rule
->genmask
= (1 << gencursor_next(net
));
1557 static inline void nft_rule_clear(struct net
*net
, struct nft_rule
*rule
)
1562 static int nf_tables_dump_rules(struct sk_buff
*skb
,
1563 struct netlink_callback
*cb
)
1565 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
1566 const struct nft_af_info
*afi
;
1567 const struct nft_table
*table
;
1568 const struct nft_chain
*chain
;
1569 const struct nft_rule
*rule
;
1570 unsigned int idx
= 0, s_idx
= cb
->args
[0];
1571 struct net
*net
= sock_net(skb
->sk
);
1572 int family
= nfmsg
->nfgen_family
;
1575 cb
->seq
= net
->nft
.base_seq
;
1577 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
1578 if (family
!= NFPROTO_UNSPEC
&& family
!= afi
->family
)
1581 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
1582 list_for_each_entry_rcu(chain
, &table
->chains
, list
) {
1583 list_for_each_entry_rcu(rule
, &chain
->rules
, list
) {
1584 if (!nft_rule_is_active(net
, rule
))
1589 memset(&cb
->args
[1], 0,
1590 sizeof(cb
->args
) - sizeof(cb
->args
[0]));
1591 if (nf_tables_fill_rule_info(skb
, NETLINK_CB(cb
->skb
).portid
,
1594 NLM_F_MULTI
| NLM_F_APPEND
,
1595 afi
->family
, table
, chain
, rule
) < 0)
1598 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
1612 static int nf_tables_getrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1613 const struct nlmsghdr
*nlh
,
1614 const struct nlattr
* const nla
[])
1616 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1617 const struct nft_af_info
*afi
;
1618 const struct nft_table
*table
;
1619 const struct nft_chain
*chain
;
1620 const struct nft_rule
*rule
;
1621 struct sk_buff
*skb2
;
1622 struct net
*net
= sock_net(skb
->sk
);
1623 int family
= nfmsg
->nfgen_family
;
1626 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
1627 struct netlink_dump_control c
= {
1628 .dump
= nf_tables_dump_rules
,
1630 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
1633 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1635 return PTR_ERR(afi
);
1637 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1639 return PTR_ERR(table
);
1640 if (table
->flags
& NFT_TABLE_INACTIVE
)
1643 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1645 return PTR_ERR(chain
);
1646 if (chain
->flags
& NFT_CHAIN_INACTIVE
)
1649 rule
= nf_tables_rule_lookup(chain
, nla
[NFTA_RULE_HANDLE
]);
1651 return PTR_ERR(rule
);
1653 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
1657 err
= nf_tables_fill_rule_info(skb2
, NETLINK_CB(skb
).portid
,
1658 nlh
->nlmsg_seq
, NFT_MSG_NEWRULE
, 0,
1659 family
, table
, chain
, rule
);
1663 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
1670 static void nf_tables_rule_destroy(const struct nft_ctx
*ctx
,
1671 struct nft_rule
*rule
)
1673 struct nft_expr
*expr
;
1676 * Careful: some expressions might not be initialized in case this
1677 * is called on error from nf_tables_newrule().
1679 expr
= nft_expr_first(rule
);
1680 while (expr
->ops
&& expr
!= nft_expr_last(rule
)) {
1681 nf_tables_expr_destroy(ctx
, expr
);
1682 expr
= nft_expr_next(expr
);
1687 static struct nft_trans
*nft_trans_rule_add(struct nft_ctx
*ctx
, int msg_type
,
1688 struct nft_rule
*rule
)
1690 struct nft_trans
*trans
;
1692 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_rule
));
1696 nft_trans_rule(trans
) = rule
;
1697 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
1702 #define NFT_RULE_MAXEXPRS 128
1704 static struct nft_expr_info
*info
;
1706 static int nf_tables_newrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1707 const struct nlmsghdr
*nlh
,
1708 const struct nlattr
* const nla
[])
1710 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1711 struct nft_af_info
*afi
;
1712 struct net
*net
= sock_net(skb
->sk
);
1713 struct nft_table
*table
;
1714 struct nft_chain
*chain
;
1715 struct nft_rule
*rule
, *old_rule
= NULL
;
1716 struct nft_trans
*trans
= NULL
;
1717 struct nft_expr
*expr
;
1720 unsigned int size
, i
, n
, ulen
= 0;
1723 u64 handle
, pos_handle
;
1725 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
1727 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
1729 return PTR_ERR(afi
);
1731 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1733 return PTR_ERR(table
);
1735 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1737 return PTR_ERR(chain
);
1739 if (nla
[NFTA_RULE_HANDLE
]) {
1740 handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_HANDLE
]));
1741 rule
= __nf_tables_rule_lookup(chain
, handle
);
1743 return PTR_ERR(rule
);
1745 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
1747 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1752 if (!create
|| nlh
->nlmsg_flags
& NLM_F_REPLACE
)
1754 handle
= nf_tables_alloc_handle(table
);
1756 if (chain
->use
== UINT_MAX
)
1760 if (nla
[NFTA_RULE_POSITION
]) {
1761 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
1764 pos_handle
= be64_to_cpu(nla_get_be64(nla
[NFTA_RULE_POSITION
]));
1765 old_rule
= __nf_tables_rule_lookup(chain
, pos_handle
);
1766 if (IS_ERR(old_rule
))
1767 return PTR_ERR(old_rule
);
1770 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1774 if (nla
[NFTA_RULE_EXPRESSIONS
]) {
1775 nla_for_each_nested(tmp
, nla
[NFTA_RULE_EXPRESSIONS
], rem
) {
1777 if (nla_type(tmp
) != NFTA_LIST_ELEM
)
1779 if (n
== NFT_RULE_MAXEXPRS
)
1781 err
= nf_tables_expr_parse(&ctx
, tmp
, &info
[n
]);
1784 size
+= info
[n
].ops
->size
;
1789 if (nla
[NFTA_RULE_USERDATA
])
1790 ulen
= nla_len(nla
[NFTA_RULE_USERDATA
]);
1793 rule
= kzalloc(sizeof(*rule
) + size
+ ulen
, GFP_KERNEL
);
1797 nft_rule_activate_next(net
, rule
);
1799 rule
->handle
= handle
;
1804 nla_memcpy(nft_userdata(rule
), nla
[NFTA_RULE_USERDATA
], ulen
);
1806 expr
= nft_expr_first(rule
);
1807 for (i
= 0; i
< n
; i
++) {
1808 err
= nf_tables_newexpr(&ctx
, &info
[i
], expr
);
1812 expr
= nft_expr_next(expr
);
1815 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
) {
1816 if (nft_rule_is_active_next(net
, old_rule
)) {
1817 trans
= nft_trans_rule_add(&ctx
, NFT_MSG_DELRULE
,
1819 if (trans
== NULL
) {
1823 nft_rule_disactivate_next(net
, old_rule
);
1825 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
1830 } else if (nlh
->nlmsg_flags
& NLM_F_APPEND
)
1832 list_add_rcu(&rule
->list
, &old_rule
->list
);
1834 list_add_tail_rcu(&rule
->list
, &chain
->rules
);
1837 list_add_tail_rcu(&rule
->list
, &old_rule
->list
);
1839 list_add_rcu(&rule
->list
, &chain
->rules
);
1842 if (nft_trans_rule_add(&ctx
, NFT_MSG_NEWRULE
, rule
) == NULL
) {
1850 list_del_rcu(&rule
->list
);
1852 list_del_rcu(&nft_trans_rule(trans
)->list
);
1853 nft_rule_clear(net
, nft_trans_rule(trans
));
1854 nft_trans_destroy(trans
);
1858 nf_tables_rule_destroy(&ctx
, rule
);
1860 for (i
= 0; i
< n
; i
++) {
1861 if (info
[i
].ops
!= NULL
)
1862 module_put(info
[i
].ops
->type
->owner
);
1868 nf_tables_delrule_one(struct nft_ctx
*ctx
, struct nft_rule
*rule
)
1870 /* You cannot delete the same rule twice */
1871 if (nft_rule_is_active_next(ctx
->net
, rule
)) {
1872 if (nft_trans_rule_add(ctx
, NFT_MSG_DELRULE
, rule
) == NULL
)
1874 nft_rule_disactivate_next(ctx
->net
, rule
);
1881 static int nf_table_delrule_by_chain(struct nft_ctx
*ctx
)
1883 struct nft_rule
*rule
;
1886 list_for_each_entry(rule
, &ctx
->chain
->rules
, list
) {
1887 err
= nf_tables_delrule_one(ctx
, rule
);
1894 static int nf_tables_delrule(struct sock
*nlsk
, struct sk_buff
*skb
,
1895 const struct nlmsghdr
*nlh
,
1896 const struct nlattr
* const nla
[])
1898 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
1899 struct nft_af_info
*afi
;
1900 struct net
*net
= sock_net(skb
->sk
);
1901 struct nft_table
*table
;
1902 struct nft_chain
*chain
= NULL
;
1903 struct nft_rule
*rule
;
1904 int family
= nfmsg
->nfgen_family
, err
= 0;
1907 afi
= nf_tables_afinfo_lookup(net
, family
, false);
1909 return PTR_ERR(afi
);
1911 table
= nf_tables_table_lookup(afi
, nla
[NFTA_RULE_TABLE
]);
1913 return PTR_ERR(table
);
1914 if (table
->flags
& NFT_TABLE_INACTIVE
)
1917 if (nla
[NFTA_RULE_CHAIN
]) {
1918 chain
= nf_tables_chain_lookup(table
, nla
[NFTA_RULE_CHAIN
]);
1920 return PTR_ERR(chain
);
1923 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, chain
, nla
);
1926 if (nla
[NFTA_RULE_HANDLE
]) {
1927 rule
= nf_tables_rule_lookup(chain
,
1928 nla
[NFTA_RULE_HANDLE
]);
1930 return PTR_ERR(rule
);
1932 err
= nf_tables_delrule_one(&ctx
, rule
);
1934 err
= nf_table_delrule_by_chain(&ctx
);
1937 list_for_each_entry(chain
, &table
->chains
, list
) {
1939 err
= nf_table_delrule_by_chain(&ctx
);
1952 static LIST_HEAD(nf_tables_set_ops
);
1954 int nft_register_set(struct nft_set_ops
*ops
)
1956 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1957 list_add_tail_rcu(&ops
->list
, &nf_tables_set_ops
);
1958 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1961 EXPORT_SYMBOL_GPL(nft_register_set
);
1963 void nft_unregister_set(struct nft_set_ops
*ops
)
1965 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1966 list_del_rcu(&ops
->list
);
1967 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1969 EXPORT_SYMBOL_GPL(nft_unregister_set
);
1972 * Select a set implementation based on the data characteristics and the
1973 * given policy. The total memory use might not be known if no size is
1974 * given, in that case the amount of memory per element is used.
1976 static const struct nft_set_ops
*
1977 nft_select_set_ops(const struct nlattr
* const nla
[],
1978 const struct nft_set_desc
*desc
,
1979 enum nft_set_policies policy
)
1981 const struct nft_set_ops
*ops
, *bops
;
1982 struct nft_set_estimate est
, best
;
1985 #ifdef CONFIG_MODULES
1986 if (list_empty(&nf_tables_set_ops
)) {
1987 nfnl_unlock(NFNL_SUBSYS_NFTABLES
);
1988 request_module("nft-set");
1989 nfnl_lock(NFNL_SUBSYS_NFTABLES
);
1990 if (!list_empty(&nf_tables_set_ops
))
1991 return ERR_PTR(-EAGAIN
);
1995 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
1996 features
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
1997 features
&= NFT_SET_INTERVAL
| NFT_SET_MAP
;
2004 list_for_each_entry(ops
, &nf_tables_set_ops
, list
) {
2005 if ((ops
->features
& features
) != features
)
2007 if (!ops
->estimate(desc
, features
, &est
))
2011 case NFT_SET_POL_PERFORMANCE
:
2012 if (est
.class < best
.class)
2014 if (est
.class == best
.class && est
.size
< best
.size
)
2017 case NFT_SET_POL_MEMORY
:
2018 if (est
.size
< best
.size
)
2020 if (est
.size
== best
.size
&& est
.class < best
.class)
2027 if (!try_module_get(ops
->owner
))
2030 module_put(bops
->owner
);
2039 return ERR_PTR(-EOPNOTSUPP
);
2042 static const struct nla_policy nft_set_policy
[NFTA_SET_MAX
+ 1] = {
2043 [NFTA_SET_TABLE
] = { .type
= NLA_STRING
},
2044 [NFTA_SET_NAME
] = { .type
= NLA_STRING
,
2045 .len
= IFNAMSIZ
- 1 },
2046 [NFTA_SET_FLAGS
] = { .type
= NLA_U32
},
2047 [NFTA_SET_KEY_TYPE
] = { .type
= NLA_U32
},
2048 [NFTA_SET_KEY_LEN
] = { .type
= NLA_U32
},
2049 [NFTA_SET_DATA_TYPE
] = { .type
= NLA_U32
},
2050 [NFTA_SET_DATA_LEN
] = { .type
= NLA_U32
},
2051 [NFTA_SET_POLICY
] = { .type
= NLA_U32
},
2052 [NFTA_SET_DESC
] = { .type
= NLA_NESTED
},
2053 [NFTA_SET_ID
] = { .type
= NLA_U32
},
2056 static const struct nla_policy nft_set_desc_policy
[NFTA_SET_DESC_MAX
+ 1] = {
2057 [NFTA_SET_DESC_SIZE
] = { .type
= NLA_U32
},
2060 static int nft_ctx_init_from_setattr(struct nft_ctx
*ctx
,
2061 const struct sk_buff
*skb
,
2062 const struct nlmsghdr
*nlh
,
2063 const struct nlattr
* const nla
[])
2065 struct net
*net
= sock_net(skb
->sk
);
2066 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2067 struct nft_af_info
*afi
= NULL
;
2068 struct nft_table
*table
= NULL
;
2070 if (nfmsg
->nfgen_family
!= NFPROTO_UNSPEC
) {
2071 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2073 return PTR_ERR(afi
);
2076 if (nla
[NFTA_SET_TABLE
] != NULL
) {
2078 return -EAFNOSUPPORT
;
2080 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2082 return PTR_ERR(table
);
2083 if (table
->flags
& NFT_TABLE_INACTIVE
)
2087 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2091 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
2092 const struct nlattr
*nla
)
2094 struct nft_set
*set
;
2097 return ERR_PTR(-EINVAL
);
2099 list_for_each_entry(set
, &table
->sets
, list
) {
2100 if (!nla_strcmp(nla
, set
->name
))
2103 return ERR_PTR(-ENOENT
);
2106 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
2107 const struct nlattr
*nla
)
2109 struct nft_trans
*trans
;
2110 u32 id
= ntohl(nla_get_be32(nla
));
2112 list_for_each_entry(trans
, &net
->nft
.commit_list
, list
) {
2113 if (trans
->msg_type
== NFT_MSG_NEWSET
&&
2114 id
== nft_trans_set_id(trans
))
2115 return nft_trans_set(trans
);
2117 return ERR_PTR(-ENOENT
);
2120 static int nf_tables_set_alloc_name(struct nft_ctx
*ctx
, struct nft_set
*set
,
2123 const struct nft_set
*i
;
2125 unsigned long *inuse
;
2126 unsigned int n
= 0, min
= 0;
2128 p
= strnchr(name
, IFNAMSIZ
, '%');
2130 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
2133 inuse
= (unsigned long *)get_zeroed_page(GFP_KERNEL
);
2137 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2140 if (!sscanf(i
->name
, name
, &tmp
))
2142 if (tmp
< min
|| tmp
>= min
+ BITS_PER_BYTE
* PAGE_SIZE
)
2145 set_bit(tmp
- min
, inuse
);
2148 n
= find_first_zero_bit(inuse
, BITS_PER_BYTE
* PAGE_SIZE
);
2149 if (n
>= BITS_PER_BYTE
* PAGE_SIZE
) {
2150 min
+= BITS_PER_BYTE
* PAGE_SIZE
;
2151 memset(inuse
, 0, PAGE_SIZE
);
2154 free_page((unsigned long)inuse
);
2157 snprintf(set
->name
, sizeof(set
->name
), name
, min
+ n
);
2158 list_for_each_entry(i
, &ctx
->table
->sets
, list
) {
2159 if (!strcmp(set
->name
, i
->name
))
2165 static int nf_tables_fill_set(struct sk_buff
*skb
, const struct nft_ctx
*ctx
,
2166 const struct nft_set
*set
, u16 event
, u16 flags
)
2168 struct nfgenmsg
*nfmsg
;
2169 struct nlmsghdr
*nlh
;
2170 struct nlattr
*desc
;
2171 u32 portid
= ctx
->portid
;
2174 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2175 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2178 goto nla_put_failure
;
2180 nfmsg
= nlmsg_data(nlh
);
2181 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2182 nfmsg
->version
= NFNETLINK_V0
;
2185 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2186 goto nla_put_failure
;
2187 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2188 goto nla_put_failure
;
2189 if (set
->flags
!= 0)
2190 if (nla_put_be32(skb
, NFTA_SET_FLAGS
, htonl(set
->flags
)))
2191 goto nla_put_failure
;
2193 if (nla_put_be32(skb
, NFTA_SET_KEY_TYPE
, htonl(set
->ktype
)))
2194 goto nla_put_failure
;
2195 if (nla_put_be32(skb
, NFTA_SET_KEY_LEN
, htonl(set
->klen
)))
2196 goto nla_put_failure
;
2197 if (set
->flags
& NFT_SET_MAP
) {
2198 if (nla_put_be32(skb
, NFTA_SET_DATA_TYPE
, htonl(set
->dtype
)))
2199 goto nla_put_failure
;
2200 if (nla_put_be32(skb
, NFTA_SET_DATA_LEN
, htonl(set
->dlen
)))
2201 goto nla_put_failure
;
2204 desc
= nla_nest_start(skb
, NFTA_SET_DESC
);
2206 goto nla_put_failure
;
2208 nla_put_be32(skb
, NFTA_SET_DESC_SIZE
, htonl(set
->size
)))
2209 goto nla_put_failure
;
2210 nla_nest_end(skb
, desc
);
2212 return nlmsg_end(skb
, nlh
);
2215 nlmsg_trim(skb
, nlh
);
2219 static int nf_tables_set_notify(const struct nft_ctx
*ctx
,
2220 const struct nft_set
*set
,
2221 int event
, gfp_t gfp_flags
)
2223 struct sk_buff
*skb
;
2224 u32 portid
= ctx
->portid
;
2228 !nfnetlink_has_listeners(ctx
->net
, NFNLGRP_NFTABLES
))
2232 skb
= nlmsg_new(NLMSG_GOODSIZE
, gfp_flags
);
2236 err
= nf_tables_fill_set(skb
, ctx
, set
, event
, 0);
2242 err
= nfnetlink_send(skb
, ctx
->net
, portid
, NFNLGRP_NFTABLES
,
2243 ctx
->report
, gfp_flags
);
2246 nfnetlink_set_err(ctx
->net
, portid
, NFNLGRP_NFTABLES
, err
);
2250 static int nf_tables_dump_sets_table(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2251 struct netlink_callback
*cb
)
2253 const struct nft_set
*set
;
2254 unsigned int idx
= 0, s_idx
= cb
->args
[0];
2260 cb
->seq
= ctx
->net
->nft
.base_seq
;
2262 list_for_each_entry_rcu(set
, &ctx
->table
->sets
, list
) {
2265 if (nf_tables_fill_set(skb
, ctx
, set
, NFT_MSG_NEWSET
,
2270 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2280 static int nf_tables_dump_sets_family(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2281 struct netlink_callback
*cb
)
2283 const struct nft_set
*set
;
2284 unsigned int idx
, s_idx
= cb
->args
[0];
2285 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2291 cb
->seq
= ctx
->net
->nft
.base_seq
;
2293 list_for_each_entry_rcu(table
, &ctx
->afi
->tables
, list
) {
2295 if (cur_table
!= table
)
2302 list_for_each_entry_rcu(set
, &ctx
->table
->sets
, list
) {
2305 if (nf_tables_fill_set(skb
, ctx
, set
, NFT_MSG_NEWSET
,
2308 cb
->args
[2] = (unsigned long) table
;
2311 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2322 static int nf_tables_dump_sets_all(struct nft_ctx
*ctx
, struct sk_buff
*skb
,
2323 struct netlink_callback
*cb
)
2325 const struct nft_set
*set
;
2326 unsigned int idx
, s_idx
= cb
->args
[0];
2327 struct nft_af_info
*afi
;
2328 struct nft_table
*table
, *cur_table
= (struct nft_table
*)cb
->args
[2];
2329 struct net
*net
= sock_net(skb
->sk
);
2330 int cur_family
= cb
->args
[3];
2336 cb
->seq
= net
->nft
.base_seq
;
2338 list_for_each_entry_rcu(afi
, &net
->nft
.af_info
, list
) {
2340 if (afi
->family
!= cur_family
)
2346 list_for_each_entry_rcu(table
, &afi
->tables
, list
) {
2348 if (cur_table
!= table
)
2357 list_for_each_entry_rcu(set
, &ctx
->table
->sets
, list
) {
2360 if (nf_tables_fill_set(skb
, ctx
, set
,
2364 cb
->args
[2] = (unsigned long) table
;
2365 cb
->args
[3] = afi
->family
;
2368 nl_dump_check_consistent(cb
, nlmsg_hdr(skb
));
2382 static int nf_tables_dump_sets(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2384 const struct nfgenmsg
*nfmsg
= nlmsg_data(cb
->nlh
);
2385 struct nlattr
*nla
[NFTA_SET_MAX
+ 1];
2389 err
= nlmsg_parse(cb
->nlh
, sizeof(*nfmsg
), nla
, NFTA_SET_MAX
,
2394 err
= nft_ctx_init_from_setattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
);
2398 if (ctx
.table
== NULL
) {
2399 if (ctx
.afi
== NULL
)
2400 ret
= nf_tables_dump_sets_all(&ctx
, skb
, cb
);
2402 ret
= nf_tables_dump_sets_family(&ctx
, skb
, cb
);
2404 ret
= nf_tables_dump_sets_table(&ctx
, skb
, cb
);
2409 #define NFT_SET_INACTIVE (1 << 15) /* Internal set flag */
2411 static int nf_tables_getset(struct sock
*nlsk
, struct sk_buff
*skb
,
2412 const struct nlmsghdr
*nlh
,
2413 const struct nlattr
* const nla
[])
2415 const struct nft_set
*set
;
2417 struct sk_buff
*skb2
;
2418 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2421 /* Verify existance before starting dump */
2422 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2426 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2427 struct netlink_dump_control c
= {
2428 .dump
= nf_tables_dump_sets
,
2430 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2433 /* Only accept unspec with dump */
2434 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2435 return -EAFNOSUPPORT
;
2437 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2439 return PTR_ERR(set
);
2440 if (set
->flags
& NFT_SET_INACTIVE
)
2443 skb2
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2447 err
= nf_tables_fill_set(skb2
, &ctx
, set
, NFT_MSG_NEWSET
, 0);
2451 return nlmsg_unicast(nlsk
, skb2
, NETLINK_CB(skb
).portid
);
2458 static int nf_tables_set_desc_parse(const struct nft_ctx
*ctx
,
2459 struct nft_set_desc
*desc
,
2460 const struct nlattr
*nla
)
2462 struct nlattr
*da
[NFTA_SET_DESC_MAX
+ 1];
2465 err
= nla_parse_nested(da
, NFTA_SET_DESC_MAX
, nla
, nft_set_desc_policy
);
2469 if (da
[NFTA_SET_DESC_SIZE
] != NULL
)
2470 desc
->size
= ntohl(nla_get_be32(da
[NFTA_SET_DESC_SIZE
]));
2475 static int nft_trans_set_add(struct nft_ctx
*ctx
, int msg_type
,
2476 struct nft_set
*set
)
2478 struct nft_trans
*trans
;
2480 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_set
));
2484 if (msg_type
== NFT_MSG_NEWSET
&& ctx
->nla
[NFTA_SET_ID
] != NULL
) {
2485 nft_trans_set_id(trans
) =
2486 ntohl(nla_get_be32(ctx
->nla
[NFTA_SET_ID
]));
2487 set
->flags
|= NFT_SET_INACTIVE
;
2489 nft_trans_set(trans
) = set
;
2490 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
2495 static int nf_tables_newset(struct sock
*nlsk
, struct sk_buff
*skb
,
2496 const struct nlmsghdr
*nlh
,
2497 const struct nlattr
* const nla
[])
2499 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2500 const struct nft_set_ops
*ops
;
2501 struct nft_af_info
*afi
;
2502 struct net
*net
= sock_net(skb
->sk
);
2503 struct nft_table
*table
;
2504 struct nft_set
*set
;
2506 char name
[IFNAMSIZ
];
2509 u32 ktype
, dtype
, flags
, policy
;
2510 struct nft_set_desc desc
;
2513 if (nla
[NFTA_SET_TABLE
] == NULL
||
2514 nla
[NFTA_SET_NAME
] == NULL
||
2515 nla
[NFTA_SET_KEY_LEN
] == NULL
||
2516 nla
[NFTA_SET_ID
] == NULL
)
2519 memset(&desc
, 0, sizeof(desc
));
2521 ktype
= NFT_DATA_VALUE
;
2522 if (nla
[NFTA_SET_KEY_TYPE
] != NULL
) {
2523 ktype
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_TYPE
]));
2524 if ((ktype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
)
2528 desc
.klen
= ntohl(nla_get_be32(nla
[NFTA_SET_KEY_LEN
]));
2529 if (desc
.klen
== 0 || desc
.klen
> FIELD_SIZEOF(struct nft_data
, data
))
2533 if (nla
[NFTA_SET_FLAGS
] != NULL
) {
2534 flags
= ntohl(nla_get_be32(nla
[NFTA_SET_FLAGS
]));
2535 if (flags
& ~(NFT_SET_ANONYMOUS
| NFT_SET_CONSTANT
|
2536 NFT_SET_INTERVAL
| NFT_SET_MAP
))
2541 if (nla
[NFTA_SET_DATA_TYPE
] != NULL
) {
2542 if (!(flags
& NFT_SET_MAP
))
2545 dtype
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_TYPE
]));
2546 if ((dtype
& NFT_DATA_RESERVED_MASK
) == NFT_DATA_RESERVED_MASK
&&
2547 dtype
!= NFT_DATA_VERDICT
)
2550 if (dtype
!= NFT_DATA_VERDICT
) {
2551 if (nla
[NFTA_SET_DATA_LEN
] == NULL
)
2553 desc
.dlen
= ntohl(nla_get_be32(nla
[NFTA_SET_DATA_LEN
]));
2554 if (desc
.dlen
== 0 ||
2555 desc
.dlen
> FIELD_SIZEOF(struct nft_data
, data
))
2558 desc
.dlen
= sizeof(struct nft_data
);
2559 } else if (flags
& NFT_SET_MAP
)
2562 policy
= NFT_SET_POL_PERFORMANCE
;
2563 if (nla
[NFTA_SET_POLICY
] != NULL
)
2564 policy
= ntohl(nla_get_be32(nla
[NFTA_SET_POLICY
]));
2566 if (nla
[NFTA_SET_DESC
] != NULL
) {
2567 err
= nf_tables_set_desc_parse(&ctx
, &desc
, nla
[NFTA_SET_DESC
]);
2572 create
= nlh
->nlmsg_flags
& NLM_F_CREATE
? true : false;
2574 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, create
);
2576 return PTR_ERR(afi
);
2578 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_TABLE
]);
2580 return PTR_ERR(table
);
2582 nft_ctx_init(&ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2584 set
= nf_tables_set_lookup(table
, nla
[NFTA_SET_NAME
]);
2586 if (PTR_ERR(set
) != -ENOENT
)
2587 return PTR_ERR(set
);
2592 if (nlh
->nlmsg_flags
& NLM_F_EXCL
)
2594 if (nlh
->nlmsg_flags
& NLM_F_REPLACE
)
2599 if (!(nlh
->nlmsg_flags
& NLM_F_CREATE
))
2602 ops
= nft_select_set_ops(nla
, &desc
, policy
);
2604 return PTR_ERR(ops
);
2607 if (ops
->privsize
!= NULL
)
2608 size
= ops
->privsize(nla
);
2611 set
= kzalloc(sizeof(*set
) + size
, GFP_KERNEL
);
2615 nla_strlcpy(name
, nla
[NFTA_SET_NAME
], sizeof(set
->name
));
2616 err
= nf_tables_set_alloc_name(&ctx
, set
, name
);
2620 INIT_LIST_HEAD(&set
->bindings
);
2623 set
->klen
= desc
.klen
;
2625 set
->dlen
= desc
.dlen
;
2627 set
->size
= desc
.size
;
2629 err
= ops
->init(set
, &desc
, nla
);
2633 err
= nft_trans_set_add(&ctx
, NFT_MSG_NEWSET
, set
);
2637 list_add_tail_rcu(&set
->list
, &table
->sets
);
2644 module_put(ops
->owner
);
2648 static void nft_set_destroy(struct nft_set
*set
)
2650 set
->ops
->destroy(set
);
2651 module_put(set
->ops
->owner
);
2655 static void nf_tables_set_destroy(const struct nft_ctx
*ctx
, struct nft_set
*set
)
2657 list_del_rcu(&set
->list
);
2658 nf_tables_set_notify(ctx
, set
, NFT_MSG_DELSET
, GFP_ATOMIC
);
2659 nft_set_destroy(set
);
2662 static int nf_tables_delset(struct sock
*nlsk
, struct sk_buff
*skb
,
2663 const struct nlmsghdr
*nlh
,
2664 const struct nlattr
* const nla
[])
2666 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2667 struct nft_set
*set
;
2671 if (nfmsg
->nfgen_family
== NFPROTO_UNSPEC
)
2672 return -EAFNOSUPPORT
;
2673 if (nla
[NFTA_SET_TABLE
] == NULL
)
2676 err
= nft_ctx_init_from_setattr(&ctx
, skb
, nlh
, nla
);
2680 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_NAME
]);
2682 return PTR_ERR(set
);
2683 if (set
->flags
& NFT_SET_INACTIVE
)
2685 if (!list_empty(&set
->bindings
))
2688 err
= nft_trans_set_add(&ctx
, NFT_MSG_DELSET
, set
);
2692 list_del_rcu(&set
->list
);
2697 static int nf_tables_bind_check_setelem(const struct nft_ctx
*ctx
,
2698 const struct nft_set
*set
,
2699 const struct nft_set_iter
*iter
,
2700 const struct nft_set_elem
*elem
)
2702 enum nft_registers dreg
;
2704 dreg
= nft_type_to_reg(set
->dtype
);
2705 return nft_validate_data_load(ctx
, dreg
, &elem
->data
,
2706 set
->dtype
== NFT_DATA_VERDICT
?
2707 NFT_DATA_VERDICT
: NFT_DATA_VALUE
);
2710 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2711 struct nft_set_binding
*binding
)
2713 struct nft_set_binding
*i
;
2714 struct nft_set_iter iter
;
2716 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
)
2719 if (set
->flags
& NFT_SET_MAP
) {
2720 /* If the set is already bound to the same chain all
2721 * jumps are already validated for that chain.
2723 list_for_each_entry(i
, &set
->bindings
, list
) {
2724 if (i
->chain
== binding
->chain
)
2731 iter
.fn
= nf_tables_bind_check_setelem
;
2733 set
->ops
->walk(ctx
, set
, &iter
);
2735 /* Destroy anonymous sets if binding fails */
2736 if (set
->flags
& NFT_SET_ANONYMOUS
)
2737 nf_tables_set_destroy(ctx
, set
);
2743 binding
->chain
= ctx
->chain
;
2744 list_add_tail_rcu(&binding
->list
, &set
->bindings
);
2748 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
2749 struct nft_set_binding
*binding
)
2751 list_del_rcu(&binding
->list
);
2753 if (list_empty(&set
->bindings
) && set
->flags
& NFT_SET_ANONYMOUS
&&
2754 !(set
->flags
& NFT_SET_INACTIVE
))
2755 nf_tables_set_destroy(ctx
, set
);
2762 static const struct nla_policy nft_set_elem_policy
[NFTA_SET_ELEM_MAX
+ 1] = {
2763 [NFTA_SET_ELEM_KEY
] = { .type
= NLA_NESTED
},
2764 [NFTA_SET_ELEM_DATA
] = { .type
= NLA_NESTED
},
2765 [NFTA_SET_ELEM_FLAGS
] = { .type
= NLA_U32
},
2768 static const struct nla_policy nft_set_elem_list_policy
[NFTA_SET_ELEM_LIST_MAX
+ 1] = {
2769 [NFTA_SET_ELEM_LIST_TABLE
] = { .type
= NLA_STRING
},
2770 [NFTA_SET_ELEM_LIST_SET
] = { .type
= NLA_STRING
},
2771 [NFTA_SET_ELEM_LIST_ELEMENTS
] = { .type
= NLA_NESTED
},
2772 [NFTA_SET_ELEM_LIST_SET_ID
] = { .type
= NLA_U32
},
2775 static int nft_ctx_init_from_elemattr(struct nft_ctx
*ctx
,
2776 const struct sk_buff
*skb
,
2777 const struct nlmsghdr
*nlh
,
2778 const struct nlattr
* const nla
[],
2781 const struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
2782 struct nft_af_info
*afi
;
2783 struct nft_table
*table
;
2784 struct net
*net
= sock_net(skb
->sk
);
2786 afi
= nf_tables_afinfo_lookup(net
, nfmsg
->nfgen_family
, false);
2788 return PTR_ERR(afi
);
2790 table
= nf_tables_table_lookup(afi
, nla
[NFTA_SET_ELEM_LIST_TABLE
]);
2792 return PTR_ERR(table
);
2793 if (!trans
&& (table
->flags
& NFT_TABLE_INACTIVE
))
2796 nft_ctx_init(ctx
, skb
, nlh
, afi
, table
, NULL
, nla
);
2800 static int nf_tables_fill_setelem(struct sk_buff
*skb
,
2801 const struct nft_set
*set
,
2802 const struct nft_set_elem
*elem
)
2804 unsigned char *b
= skb_tail_pointer(skb
);
2805 struct nlattr
*nest
;
2807 nest
= nla_nest_start(skb
, NFTA_LIST_ELEM
);
2809 goto nla_put_failure
;
2811 if (nft_data_dump(skb
, NFTA_SET_ELEM_KEY
, &elem
->key
, NFT_DATA_VALUE
,
2813 goto nla_put_failure
;
2815 if (set
->flags
& NFT_SET_MAP
&&
2816 !(elem
->flags
& NFT_SET_ELEM_INTERVAL_END
) &&
2817 nft_data_dump(skb
, NFTA_SET_ELEM_DATA
, &elem
->data
,
2818 set
->dtype
== NFT_DATA_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
,
2820 goto nla_put_failure
;
2822 if (elem
->flags
!= 0)
2823 if (nla_put_be32(skb
, NFTA_SET_ELEM_FLAGS
, htonl(elem
->flags
)))
2824 goto nla_put_failure
;
2826 nla_nest_end(skb
, nest
);
2834 struct nft_set_dump_args
{
2835 const struct netlink_callback
*cb
;
2836 struct nft_set_iter iter
;
2837 struct sk_buff
*skb
;
2840 static int nf_tables_dump_setelem(const struct nft_ctx
*ctx
,
2841 const struct nft_set
*set
,
2842 const struct nft_set_iter
*iter
,
2843 const struct nft_set_elem
*elem
)
2845 struct nft_set_dump_args
*args
;
2847 args
= container_of(iter
, struct nft_set_dump_args
, iter
);
2848 return nf_tables_fill_setelem(args
->skb
, set
, elem
);
2851 static int nf_tables_dump_set(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2853 const struct nft_set
*set
;
2854 struct nft_set_dump_args args
;
2856 struct nlattr
*nla
[NFTA_SET_ELEM_LIST_MAX
+ 1];
2857 struct nfgenmsg
*nfmsg
;
2858 struct nlmsghdr
*nlh
;
2859 struct nlattr
*nest
;
2863 err
= nlmsg_parse(cb
->nlh
, sizeof(struct nfgenmsg
), nla
,
2864 NFTA_SET_ELEM_LIST_MAX
, nft_set_elem_list_policy
);
2868 err
= nft_ctx_init_from_elemattr(&ctx
, cb
->skb
, cb
->nlh
, (void *)nla
,
2873 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2875 return PTR_ERR(set
);
2876 if (set
->flags
& NFT_SET_INACTIVE
)
2879 event
= NFT_MSG_NEWSETELEM
;
2880 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2881 portid
= NETLINK_CB(cb
->skb
).portid
;
2882 seq
= cb
->nlh
->nlmsg_seq
;
2884 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2887 goto nla_put_failure
;
2889 nfmsg
= nlmsg_data(nlh
);
2890 nfmsg
->nfgen_family
= ctx
.afi
->family
;
2891 nfmsg
->version
= NFNETLINK_V0
;
2894 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_TABLE
, ctx
.table
->name
))
2895 goto nla_put_failure
;
2896 if (nla_put_string(skb
, NFTA_SET_ELEM_LIST_SET
, set
->name
))
2897 goto nla_put_failure
;
2899 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2901 goto nla_put_failure
;
2905 args
.iter
.skip
= cb
->args
[0];
2906 args
.iter
.count
= 0;
2908 args
.iter
.fn
= nf_tables_dump_setelem
;
2909 set
->ops
->walk(&ctx
, set
, &args
.iter
);
2911 nla_nest_end(skb
, nest
);
2912 nlmsg_end(skb
, nlh
);
2914 if (args
.iter
.err
&& args
.iter
.err
!= -EMSGSIZE
)
2915 return args
.iter
.err
;
2916 if (args
.iter
.count
== cb
->args
[0])
2919 cb
->args
[0] = args
.iter
.count
;
2926 static int nf_tables_getsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
2927 const struct nlmsghdr
*nlh
,
2928 const struct nlattr
* const nla
[])
2930 const struct nft_set
*set
;
2934 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
2938 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
2940 return PTR_ERR(set
);
2941 if (set
->flags
& NFT_SET_INACTIVE
)
2944 if (nlh
->nlmsg_flags
& NLM_F_DUMP
) {
2945 struct netlink_dump_control c
= {
2946 .dump
= nf_tables_dump_set
,
2948 return netlink_dump_start(nlsk
, skb
, nlh
, &c
);
2953 static int nf_tables_fill_setelem_info(struct sk_buff
*skb
,
2954 const struct nft_ctx
*ctx
, u32 seq
,
2955 u32 portid
, int event
, u16 flags
,
2956 const struct nft_set
*set
,
2957 const struct nft_set_elem
*elem
)
2959 struct nfgenmsg
*nfmsg
;
2960 struct nlmsghdr
*nlh
;
2961 struct nlattr
*nest
;
2964 event
|= NFNL_SUBSYS_NFTABLES
<< 8;
2965 nlh
= nlmsg_put(skb
, portid
, seq
, event
, sizeof(struct nfgenmsg
),
2968 goto nla_put_failure
;
2970 nfmsg
= nlmsg_data(nlh
);
2971 nfmsg
->nfgen_family
= ctx
->afi
->family
;
2972 nfmsg
->version
= NFNETLINK_V0
;
2975 if (nla_put_string(skb
, NFTA_SET_TABLE
, ctx
->table
->name
))
2976 goto nla_put_failure
;
2977 if (nla_put_string(skb
, NFTA_SET_NAME
, set
->name
))
2978 goto nla_put_failure
;
2980 nest
= nla_nest_start(skb
, NFTA_SET_ELEM_LIST_ELEMENTS
);
2982 goto nla_put_failure
;
2984 err
= nf_tables_fill_setelem(skb
, set
, elem
);
2986 goto nla_put_failure
;
2988 nla_nest_end(skb
, nest
);
2990 return nlmsg_end(skb
, nlh
);
2993 nlmsg_trim(skb
, nlh
);
2997 static int nf_tables_setelem_notify(const struct nft_ctx
*ctx
,
2998 const struct nft_set
*set
,
2999 const struct nft_set_elem
*elem
,
3000 int event
, u16 flags
)
3002 struct net
*net
= ctx
->net
;
3003 u32 portid
= ctx
->portid
;
3004 struct sk_buff
*skb
;
3007 if (!ctx
->report
&& !nfnetlink_has_listeners(net
, NFNLGRP_NFTABLES
))
3011 skb
= nlmsg_new(NLMSG_GOODSIZE
, GFP_KERNEL
);
3015 err
= nf_tables_fill_setelem_info(skb
, ctx
, 0, portid
, event
, flags
,
3022 err
= nfnetlink_send(skb
, net
, portid
, NFNLGRP_NFTABLES
, ctx
->report
,
3026 nfnetlink_set_err(net
, portid
, NFNLGRP_NFTABLES
, err
);
3030 static struct nft_trans
*nft_trans_elem_alloc(struct nft_ctx
*ctx
,
3032 struct nft_set
*set
)
3034 struct nft_trans
*trans
;
3036 trans
= nft_trans_alloc(ctx
, msg_type
, sizeof(struct nft_trans_elem
));
3040 nft_trans_elem_set(trans
) = set
;
3044 static int nft_add_set_elem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3045 const struct nlattr
*attr
)
3047 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3048 struct nft_data_desc d1
, d2
;
3049 struct nft_set_elem elem
;
3050 struct nft_set_binding
*binding
;
3051 enum nft_registers dreg
;
3052 struct nft_trans
*trans
;
3055 if (set
->size
&& set
->nelems
== set
->size
)
3058 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3059 nft_set_elem_policy
);
3063 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3067 if (nla
[NFTA_SET_ELEM_FLAGS
] != NULL
) {
3068 elem
.flags
= ntohl(nla_get_be32(nla
[NFTA_SET_ELEM_FLAGS
]));
3069 if (elem
.flags
& ~NFT_SET_ELEM_INTERVAL_END
)
3073 if (set
->flags
& NFT_SET_MAP
) {
3074 if (nla
[NFTA_SET_ELEM_DATA
] == NULL
&&
3075 !(elem
.flags
& NFT_SET_ELEM_INTERVAL_END
))
3077 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
&&
3078 elem
.flags
& NFT_SET_ELEM_INTERVAL_END
)
3081 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3085 err
= nft_data_init(ctx
, &elem
.key
, &d1
, nla
[NFTA_SET_ELEM_KEY
]);
3089 if (d1
.type
!= NFT_DATA_VALUE
|| d1
.len
!= set
->klen
)
3093 if (set
->ops
->get(set
, &elem
) == 0)
3096 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
) {
3097 err
= nft_data_init(ctx
, &elem
.data
, &d2
, nla
[NFTA_SET_ELEM_DATA
]);
3102 if (set
->dtype
!= NFT_DATA_VERDICT
&& d2
.len
!= set
->dlen
)
3105 dreg
= nft_type_to_reg(set
->dtype
);
3106 list_for_each_entry(binding
, &set
->bindings
, list
) {
3107 struct nft_ctx bind_ctx
= {
3109 .table
= ctx
->table
,
3110 .chain
= (struct nft_chain
*)binding
->chain
,
3113 err
= nft_validate_data_load(&bind_ctx
, dreg
,
3114 &elem
.data
, d2
.type
);
3120 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_NEWSETELEM
, set
);
3124 err
= set
->ops
->insert(set
, &elem
);
3128 nft_trans_elem(trans
) = elem
;
3129 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3135 if (nla
[NFTA_SET_ELEM_DATA
] != NULL
)
3136 nft_data_uninit(&elem
.data
, d2
.type
);
3138 nft_data_uninit(&elem
.key
, d1
.type
);
3143 static int nf_tables_newsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3144 const struct nlmsghdr
*nlh
,
3145 const struct nlattr
* const nla
[])
3147 struct net
*net
= sock_net(skb
->sk
);
3148 const struct nlattr
*attr
;
3149 struct nft_set
*set
;
3153 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, true);
3157 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3159 if (nla
[NFTA_SET_ELEM_LIST_SET_ID
]) {
3160 set
= nf_tables_set_lookup_byid(net
,
3161 nla
[NFTA_SET_ELEM_LIST_SET_ID
]);
3164 return PTR_ERR(set
);
3167 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3170 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3171 err
= nft_add_set_elem(&ctx
, set
, attr
);
3180 static int nft_del_setelem(struct nft_ctx
*ctx
, struct nft_set
*set
,
3181 const struct nlattr
*attr
)
3183 struct nlattr
*nla
[NFTA_SET_ELEM_MAX
+ 1];
3184 struct nft_data_desc desc
;
3185 struct nft_set_elem elem
;
3186 struct nft_trans
*trans
;
3189 err
= nla_parse_nested(nla
, NFTA_SET_ELEM_MAX
, attr
,
3190 nft_set_elem_policy
);
3195 if (nla
[NFTA_SET_ELEM_KEY
] == NULL
)
3198 err
= nft_data_init(ctx
, &elem
.key
, &desc
, nla
[NFTA_SET_ELEM_KEY
]);
3203 if (desc
.type
!= NFT_DATA_VALUE
|| desc
.len
!= set
->klen
)
3206 err
= set
->ops
->get(set
, &elem
);
3210 trans
= nft_trans_elem_alloc(ctx
, NFT_MSG_DELSETELEM
, set
);
3214 nft_trans_elem(trans
) = elem
;
3215 list_add_tail(&trans
->list
, &ctx
->net
->nft
.commit_list
);
3217 nft_data_uninit(&elem
.key
, NFT_DATA_VALUE
);
3218 if (set
->flags
& NFT_SET_MAP
)
3219 nft_data_uninit(&elem
.data
, set
->dtype
);
3222 nft_data_uninit(&elem
.key
, desc
.type
);
3227 static int nf_tables_delsetelem(struct sock
*nlsk
, struct sk_buff
*skb
,
3228 const struct nlmsghdr
*nlh
,
3229 const struct nlattr
* const nla
[])
3231 const struct nlattr
*attr
;
3232 struct nft_set
*set
;
3236 err
= nft_ctx_init_from_elemattr(&ctx
, skb
, nlh
, nla
, false);
3240 set
= nf_tables_set_lookup(ctx
.table
, nla
[NFTA_SET_ELEM_LIST_SET
]);
3242 return PTR_ERR(set
);
3243 if (!list_empty(&set
->bindings
) && set
->flags
& NFT_SET_CONSTANT
)
3246 nla_for_each_nested(attr
, nla
[NFTA_SET_ELEM_LIST_ELEMENTS
], rem
) {
3247 err
= nft_del_setelem(&ctx
, set
, attr
);
3256 static const struct nfnl_callback nf_tables_cb
[NFT_MSG_MAX
] = {
3257 [NFT_MSG_NEWTABLE
] = {
3258 .call_batch
= nf_tables_newtable
,
3259 .attr_count
= NFTA_TABLE_MAX
,
3260 .policy
= nft_table_policy
,
3262 [NFT_MSG_GETTABLE
] = {
3263 .call
= nf_tables_gettable
,
3264 .attr_count
= NFTA_TABLE_MAX
,
3265 .policy
= nft_table_policy
,
3267 [NFT_MSG_DELTABLE
] = {
3268 .call_batch
= nf_tables_deltable
,
3269 .attr_count
= NFTA_TABLE_MAX
,
3270 .policy
= nft_table_policy
,
3272 [NFT_MSG_NEWCHAIN
] = {
3273 .call_batch
= nf_tables_newchain
,
3274 .attr_count
= NFTA_CHAIN_MAX
,
3275 .policy
= nft_chain_policy
,
3277 [NFT_MSG_GETCHAIN
] = {
3278 .call
= nf_tables_getchain
,
3279 .attr_count
= NFTA_CHAIN_MAX
,
3280 .policy
= nft_chain_policy
,
3282 [NFT_MSG_DELCHAIN
] = {
3283 .call_batch
= nf_tables_delchain
,
3284 .attr_count
= NFTA_CHAIN_MAX
,
3285 .policy
= nft_chain_policy
,
3287 [NFT_MSG_NEWRULE
] = {
3288 .call_batch
= nf_tables_newrule
,
3289 .attr_count
= NFTA_RULE_MAX
,
3290 .policy
= nft_rule_policy
,
3292 [NFT_MSG_GETRULE
] = {
3293 .call
= nf_tables_getrule
,
3294 .attr_count
= NFTA_RULE_MAX
,
3295 .policy
= nft_rule_policy
,
3297 [NFT_MSG_DELRULE
] = {
3298 .call_batch
= nf_tables_delrule
,
3299 .attr_count
= NFTA_RULE_MAX
,
3300 .policy
= nft_rule_policy
,
3302 [NFT_MSG_NEWSET
] = {
3303 .call_batch
= nf_tables_newset
,
3304 .attr_count
= NFTA_SET_MAX
,
3305 .policy
= nft_set_policy
,
3307 [NFT_MSG_GETSET
] = {
3308 .call
= nf_tables_getset
,
3309 .attr_count
= NFTA_SET_MAX
,
3310 .policy
= nft_set_policy
,
3312 [NFT_MSG_DELSET
] = {
3313 .call_batch
= nf_tables_delset
,
3314 .attr_count
= NFTA_SET_MAX
,
3315 .policy
= nft_set_policy
,
3317 [NFT_MSG_NEWSETELEM
] = {
3318 .call_batch
= nf_tables_newsetelem
,
3319 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3320 .policy
= nft_set_elem_list_policy
,
3322 [NFT_MSG_GETSETELEM
] = {
3323 .call
= nf_tables_getsetelem
,
3324 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3325 .policy
= nft_set_elem_list_policy
,
3327 [NFT_MSG_DELSETELEM
] = {
3328 .call_batch
= nf_tables_delsetelem
,
3329 .attr_count
= NFTA_SET_ELEM_LIST_MAX
,
3330 .policy
= nft_set_elem_list_policy
,
3334 static void nft_chain_commit_update(struct nft_trans
*trans
)
3336 struct nft_base_chain
*basechain
;
3338 if (nft_trans_chain_name(trans
)[0])
3339 strcpy(trans
->ctx
.chain
->name
, nft_trans_chain_name(trans
));
3341 if (!(trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
))
3344 basechain
= nft_base_chain(trans
->ctx
.chain
);
3345 nft_chain_stats_replace(basechain
, nft_trans_chain_stats(trans
));
3347 switch (nft_trans_chain_policy(trans
)) {
3350 basechain
->policy
= nft_trans_chain_policy(trans
);
3355 /* Schedule objects for release via rcu to make sure no packets are accesing
3358 static void nf_tables_commit_release_rcu(struct rcu_head
*rt
)
3360 struct nft_trans
*trans
= container_of(rt
, struct nft_trans
, rcu_head
);
3362 switch (trans
->msg_type
) {
3363 case NFT_MSG_DELTABLE
:
3364 nf_tables_table_destroy(&trans
->ctx
);
3366 case NFT_MSG_DELCHAIN
:
3367 nf_tables_chain_destroy(trans
->ctx
.chain
);
3369 case NFT_MSG_DELRULE
:
3370 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3372 case NFT_MSG_DELSET
:
3373 nft_set_destroy(nft_trans_set(trans
));
3379 static int nf_tables_commit(struct sk_buff
*skb
)
3381 struct net
*net
= sock_net(skb
->sk
);
3382 struct nft_trans
*trans
, *next
;
3383 struct nft_set
*set
;
3385 /* Bump generation counter, invalidate any dump in progress */
3386 while (++net
->nft
.base_seq
== 0);
3388 /* A new generation has just started */
3389 net
->nft
.gencursor
= gencursor_next(net
);
3391 /* Make sure all packets have left the previous generation before
3392 * purging old rules.
3396 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3397 switch (trans
->msg_type
) {
3398 case NFT_MSG_NEWTABLE
:
3399 if (nft_trans_table_update(trans
)) {
3400 if (!nft_trans_table_enable(trans
)) {
3401 nf_tables_table_disable(trans
->ctx
.afi
,
3403 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3406 trans
->ctx
.table
->flags
&= ~NFT_TABLE_INACTIVE
;
3408 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_NEWTABLE
);
3409 nft_trans_destroy(trans
);
3411 case NFT_MSG_DELTABLE
:
3412 nf_tables_table_notify(&trans
->ctx
, NFT_MSG_DELTABLE
);
3414 case NFT_MSG_NEWCHAIN
:
3415 if (nft_trans_chain_update(trans
))
3416 nft_chain_commit_update(trans
);
3418 trans
->ctx
.chain
->flags
&= ~NFT_CHAIN_INACTIVE
;
3420 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_NEWCHAIN
);
3421 nft_trans_destroy(trans
);
3423 case NFT_MSG_DELCHAIN
:
3424 nf_tables_chain_notify(&trans
->ctx
, NFT_MSG_DELCHAIN
);
3425 if (!(trans
->ctx
.table
->flags
& NFT_TABLE_F_DORMANT
) &&
3426 trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
) {
3427 nf_unregister_hooks(nft_base_chain(trans
->ctx
.chain
)->ops
,
3428 trans
->ctx
.afi
->nops
);
3431 case NFT_MSG_NEWRULE
:
3432 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3433 nf_tables_rule_notify(&trans
->ctx
,
3434 nft_trans_rule(trans
),
3436 nft_trans_destroy(trans
);
3438 case NFT_MSG_DELRULE
:
3439 list_del_rcu(&nft_trans_rule(trans
)->list
);
3440 nf_tables_rule_notify(&trans
->ctx
,
3441 nft_trans_rule(trans
),
3444 case NFT_MSG_NEWSET
:
3445 nft_trans_set(trans
)->flags
&= ~NFT_SET_INACTIVE
;
3446 /* This avoids hitting -EBUSY when deleting the table
3447 * from the transaction.
3449 if (nft_trans_set(trans
)->flags
& NFT_SET_ANONYMOUS
&&
3450 !list_empty(&nft_trans_set(trans
)->bindings
))
3451 trans
->ctx
.table
->use
--;
3453 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3454 NFT_MSG_NEWSET
, GFP_KERNEL
);
3455 nft_trans_destroy(trans
);
3457 case NFT_MSG_DELSET
:
3458 nf_tables_set_notify(&trans
->ctx
, nft_trans_set(trans
),
3459 NFT_MSG_DELSET
, GFP_KERNEL
);
3461 case NFT_MSG_NEWSETELEM
:
3462 nf_tables_setelem_notify(&trans
->ctx
,
3463 nft_trans_elem_set(trans
),
3464 &nft_trans_elem(trans
),
3465 NFT_MSG_NEWSETELEM
, 0);
3466 nft_trans_destroy(trans
);
3468 case NFT_MSG_DELSETELEM
:
3469 nf_tables_setelem_notify(&trans
->ctx
,
3470 nft_trans_elem_set(trans
),
3471 &nft_trans_elem(trans
),
3472 NFT_MSG_DELSETELEM
, 0);
3473 set
= nft_trans_elem_set(trans
);
3474 set
->ops
->get(set
, &nft_trans_elem(trans
));
3475 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3476 nft_trans_destroy(trans
);
3481 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3482 list_del(&trans
->list
);
3483 trans
->ctx
.nla
= NULL
;
3484 call_rcu(&trans
->rcu_head
, nf_tables_commit_release_rcu
);
3490 /* Schedule objects for release via rcu to make sure no packets are accesing
3493 static void nf_tables_abort_release_rcu(struct rcu_head
*rt
)
3495 struct nft_trans
*trans
= container_of(rt
, struct nft_trans
, rcu_head
);
3497 switch (trans
->msg_type
) {
3498 case NFT_MSG_NEWTABLE
:
3499 nf_tables_table_destroy(&trans
->ctx
);
3501 case NFT_MSG_NEWCHAIN
:
3502 nf_tables_chain_destroy(trans
->ctx
.chain
);
3504 case NFT_MSG_NEWRULE
:
3505 nf_tables_rule_destroy(&trans
->ctx
, nft_trans_rule(trans
));
3507 case NFT_MSG_NEWSET
:
3508 nft_set_destroy(nft_trans_set(trans
));
3514 static int nf_tables_abort(struct sk_buff
*skb
)
3516 struct net
*net
= sock_net(skb
->sk
);
3517 struct nft_trans
*trans
, *next
;
3518 struct nft_set
*set
;
3520 list_for_each_entry_safe(trans
, next
, &net
->nft
.commit_list
, list
) {
3521 switch (trans
->msg_type
) {
3522 case NFT_MSG_NEWTABLE
:
3523 if (nft_trans_table_update(trans
)) {
3524 if (nft_trans_table_enable(trans
)) {
3525 nf_tables_table_disable(trans
->ctx
.afi
,
3527 trans
->ctx
.table
->flags
|= NFT_TABLE_F_DORMANT
;
3529 nft_trans_destroy(trans
);
3531 list_del_rcu(&trans
->ctx
.table
->list
);
3534 case NFT_MSG_DELTABLE
:
3535 list_add_tail_rcu(&trans
->ctx
.table
->list
,
3536 &trans
->ctx
.afi
->tables
);
3537 nft_trans_destroy(trans
);
3539 case NFT_MSG_NEWCHAIN
:
3540 if (nft_trans_chain_update(trans
)) {
3541 if (nft_trans_chain_stats(trans
))
3542 free_percpu(nft_trans_chain_stats(trans
));
3544 nft_trans_destroy(trans
);
3546 trans
->ctx
.table
->use
--;
3547 list_del_rcu(&trans
->ctx
.chain
->list
);
3548 if (!(trans
->ctx
.table
->flags
& NFT_TABLE_F_DORMANT
) &&
3549 trans
->ctx
.chain
->flags
& NFT_BASE_CHAIN
) {
3550 nf_unregister_hooks(nft_base_chain(trans
->ctx
.chain
)->ops
,
3551 trans
->ctx
.afi
->nops
);
3555 case NFT_MSG_DELCHAIN
:
3556 trans
->ctx
.table
->use
++;
3557 list_add_tail_rcu(&trans
->ctx
.chain
->list
,
3558 &trans
->ctx
.table
->chains
);
3559 nft_trans_destroy(trans
);
3561 case NFT_MSG_NEWRULE
:
3562 trans
->ctx
.chain
->use
--;
3563 list_del_rcu(&nft_trans_rule(trans
)->list
);
3565 case NFT_MSG_DELRULE
:
3566 trans
->ctx
.chain
->use
++;
3567 nft_rule_clear(trans
->ctx
.net
, nft_trans_rule(trans
));
3568 nft_trans_destroy(trans
);
3570 case NFT_MSG_NEWSET
:
3571 trans
->ctx
.table
->use
--;
3572 list_del_rcu(&nft_trans_set(trans
)->list
);
3574 case NFT_MSG_DELSET
:
3575 trans
->ctx
.table
->use
++;
3576 list_add_tail_rcu(&nft_trans_set(trans
)->list
,
3577 &trans
->ctx
.table
->sets
);
3578 nft_trans_destroy(trans
);
3580 case NFT_MSG_NEWSETELEM
:
3581 nft_trans_elem_set(trans
)->nelems
--;
3582 set
= nft_trans_elem_set(trans
);
3583 set
->ops
->get(set
, &nft_trans_elem(trans
));
3584 set
->ops
->remove(set
, &nft_trans_elem(trans
));
3585 nft_trans_destroy(trans
);
3587 case NFT_MSG_DELSETELEM
:
3588 nft_trans_elem_set(trans
)->nelems
++;
3589 nft_trans_destroy(trans
);
3594 list_for_each_entry_safe_reverse(trans
, next
,
3595 &net
->nft
.commit_list
, list
) {
3596 list_del(&trans
->list
);
3597 trans
->ctx
.nla
= NULL
;
3598 call_rcu(&trans
->rcu_head
, nf_tables_abort_release_rcu
);
3604 static const struct nfnetlink_subsystem nf_tables_subsys
= {
3605 .name
= "nf_tables",
3606 .subsys_id
= NFNL_SUBSYS_NFTABLES
,
3607 .cb_count
= NFT_MSG_MAX
,
3609 .commit
= nf_tables_commit
,
3610 .abort
= nf_tables_abort
,
3614 * Loop detection - walk through the ruleset beginning at the destination chain
3615 * of a new jump until either the source chain is reached (loop) or all
3616 * reachable chains have been traversed.
3618 * The loop check is performed whenever a new jump verdict is added to an
3619 * expression or verdict map or a verdict map is bound to a new chain.
3622 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3623 const struct nft_chain
*chain
);
3625 static int nf_tables_loop_check_setelem(const struct nft_ctx
*ctx
,
3626 const struct nft_set
*set
,
3627 const struct nft_set_iter
*iter
,
3628 const struct nft_set_elem
*elem
)
3630 if (elem
->flags
& NFT_SET_ELEM_INTERVAL_END
)
3633 switch (elem
->data
.verdict
) {
3636 return nf_tables_check_loops(ctx
, elem
->data
.chain
);
3642 static int nf_tables_check_loops(const struct nft_ctx
*ctx
,
3643 const struct nft_chain
*chain
)
3645 const struct nft_rule
*rule
;
3646 const struct nft_expr
*expr
, *last
;
3647 const struct nft_set
*set
;
3648 struct nft_set_binding
*binding
;
3649 struct nft_set_iter iter
;
3651 if (ctx
->chain
== chain
)
3654 list_for_each_entry(rule
, &chain
->rules
, list
) {
3655 nft_rule_for_each_expr(expr
, last
, rule
) {
3656 const struct nft_data
*data
= NULL
;
3659 if (!expr
->ops
->validate
)
3662 err
= expr
->ops
->validate(ctx
, expr
, &data
);
3669 switch (data
->verdict
) {
3672 err
= nf_tables_check_loops(ctx
, data
->chain
);
3681 list_for_each_entry(set
, &ctx
->table
->sets
, list
) {
3682 if (!(set
->flags
& NFT_SET_MAP
) ||
3683 set
->dtype
!= NFT_DATA_VERDICT
)
3686 list_for_each_entry(binding
, &set
->bindings
, list
) {
3687 if (binding
->chain
!= chain
)
3693 iter
.fn
= nf_tables_loop_check_setelem
;
3695 set
->ops
->walk(ctx
, set
, &iter
);
3705 * nft_validate_input_register - validate an expressions' input register
3707 * @reg: the register number
3709 * Validate that the input register is one of the general purpose
3712 int nft_validate_input_register(enum nft_registers reg
)
3714 if (reg
<= NFT_REG_VERDICT
)
3716 if (reg
> NFT_REG_MAX
)
3720 EXPORT_SYMBOL_GPL(nft_validate_input_register
);
3723 * nft_validate_output_register - validate an expressions' output register
3725 * @reg: the register number
3727 * Validate that the output register is one of the general purpose
3728 * registers or the verdict register.
3730 int nft_validate_output_register(enum nft_registers reg
)
3732 if (reg
< NFT_REG_VERDICT
)
3734 if (reg
> NFT_REG_MAX
)
3738 EXPORT_SYMBOL_GPL(nft_validate_output_register
);
3741 * nft_validate_data_load - validate an expressions' data load
3743 * @ctx: context of the expression performing the load
3744 * @reg: the destination register number
3745 * @data: the data to load
3746 * @type: the data type
3748 * Validate that a data load uses the appropriate data type for
3749 * the destination register. A value of NULL for the data means
3750 * that its runtime gathered data, which is always of type
3753 int nft_validate_data_load(const struct nft_ctx
*ctx
, enum nft_registers reg
,
3754 const struct nft_data
*data
,
3755 enum nft_data_types type
)
3760 case NFT_REG_VERDICT
:
3761 if (data
== NULL
|| type
!= NFT_DATA_VERDICT
)
3764 if (data
->verdict
== NFT_GOTO
|| data
->verdict
== NFT_JUMP
) {
3765 err
= nf_tables_check_loops(ctx
, data
->chain
);
3769 if (ctx
->chain
->level
+ 1 > data
->chain
->level
) {
3770 if (ctx
->chain
->level
+ 1 == NFT_JUMP_STACK_SIZE
)
3772 data
->chain
->level
= ctx
->chain
->level
+ 1;
3778 if (data
!= NULL
&& type
!= NFT_DATA_VALUE
)
3783 EXPORT_SYMBOL_GPL(nft_validate_data_load
);
3785 static const struct nla_policy nft_verdict_policy
[NFTA_VERDICT_MAX
+ 1] = {
3786 [NFTA_VERDICT_CODE
] = { .type
= NLA_U32
},
3787 [NFTA_VERDICT_CHAIN
] = { .type
= NLA_STRING
,
3788 .len
= NFT_CHAIN_MAXNAMELEN
- 1 },
3791 static int nft_verdict_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3792 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3794 struct nlattr
*tb
[NFTA_VERDICT_MAX
+ 1];
3795 struct nft_chain
*chain
;
3798 err
= nla_parse_nested(tb
, NFTA_VERDICT_MAX
, nla
, nft_verdict_policy
);
3802 if (!tb
[NFTA_VERDICT_CODE
])
3804 data
->verdict
= ntohl(nla_get_be32(tb
[NFTA_VERDICT_CODE
]));
3806 switch (data
->verdict
) {
3808 switch (data
->verdict
& NF_VERDICT_MASK
) {
3820 desc
->len
= sizeof(data
->verdict
);
3824 if (!tb
[NFTA_VERDICT_CHAIN
])
3826 chain
= nf_tables_chain_lookup(ctx
->table
,
3827 tb
[NFTA_VERDICT_CHAIN
]);
3829 return PTR_ERR(chain
);
3830 if (chain
->flags
& NFT_BASE_CHAIN
)
3834 data
->chain
= chain
;
3835 desc
->len
= sizeof(data
);
3839 desc
->type
= NFT_DATA_VERDICT
;
3843 static void nft_verdict_uninit(const struct nft_data
*data
)
3845 switch (data
->verdict
) {
3853 static int nft_verdict_dump(struct sk_buff
*skb
, const struct nft_data
*data
)
3855 struct nlattr
*nest
;
3857 nest
= nla_nest_start(skb
, NFTA_DATA_VERDICT
);
3859 goto nla_put_failure
;
3861 if (nla_put_be32(skb
, NFTA_VERDICT_CODE
, htonl(data
->verdict
)))
3862 goto nla_put_failure
;
3864 switch (data
->verdict
) {
3867 if (nla_put_string(skb
, NFTA_VERDICT_CHAIN
, data
->chain
->name
))
3868 goto nla_put_failure
;
3870 nla_nest_end(skb
, nest
);
3877 static int nft_value_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3878 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3885 if (len
> sizeof(data
->data
))
3888 nla_memcpy(data
->data
, nla
, sizeof(data
->data
));
3889 desc
->type
= NFT_DATA_VALUE
;
3894 static int nft_value_dump(struct sk_buff
*skb
, const struct nft_data
*data
,
3897 return nla_put(skb
, NFTA_DATA_VALUE
, len
, data
->data
);
3900 static const struct nla_policy nft_data_policy
[NFTA_DATA_MAX
+ 1] = {
3901 [NFTA_DATA_VALUE
] = { .type
= NLA_BINARY
,
3902 .len
= FIELD_SIZEOF(struct nft_data
, data
) },
3903 [NFTA_DATA_VERDICT
] = { .type
= NLA_NESTED
},
3907 * nft_data_init - parse nf_tables data netlink attributes
3909 * @ctx: context of the expression using the data
3910 * @data: destination struct nft_data
3911 * @desc: data description
3912 * @nla: netlink attribute containing data
3914 * Parse the netlink data attributes and initialize a struct nft_data.
3915 * The type and length of data are returned in the data description.
3917 * The caller can indicate that it only wants to accept data of type
3918 * NFT_DATA_VALUE by passing NULL for the ctx argument.
3920 int nft_data_init(const struct nft_ctx
*ctx
, struct nft_data
*data
,
3921 struct nft_data_desc
*desc
, const struct nlattr
*nla
)
3923 struct nlattr
*tb
[NFTA_DATA_MAX
+ 1];
3926 err
= nla_parse_nested(tb
, NFTA_DATA_MAX
, nla
, nft_data_policy
);
3930 if (tb
[NFTA_DATA_VALUE
])
3931 return nft_value_init(ctx
, data
, desc
, tb
[NFTA_DATA_VALUE
]);
3932 if (tb
[NFTA_DATA_VERDICT
] && ctx
!= NULL
)
3933 return nft_verdict_init(ctx
, data
, desc
, tb
[NFTA_DATA_VERDICT
]);
3936 EXPORT_SYMBOL_GPL(nft_data_init
);
3939 * nft_data_uninit - release a nft_data item
3941 * @data: struct nft_data to release
3942 * @type: type of data
3944 * Release a nft_data item. NFT_DATA_VALUE types can be silently discarded,
3945 * all others need to be released by calling this function.
3947 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
)
3950 case NFT_DATA_VALUE
:
3952 case NFT_DATA_VERDICT
:
3953 return nft_verdict_uninit(data
);
3958 EXPORT_SYMBOL_GPL(nft_data_uninit
);
3960 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
3961 enum nft_data_types type
, unsigned int len
)
3963 struct nlattr
*nest
;
3966 nest
= nla_nest_start(skb
, attr
);
3971 case NFT_DATA_VALUE
:
3972 err
= nft_value_dump(skb
, data
, len
);
3974 case NFT_DATA_VERDICT
:
3975 err
= nft_verdict_dump(skb
, data
);
3982 nla_nest_end(skb
, nest
);
3985 EXPORT_SYMBOL_GPL(nft_data_dump
);
3987 static int nf_tables_init_net(struct net
*net
)
3989 INIT_LIST_HEAD(&net
->nft
.af_info
);
3990 INIT_LIST_HEAD(&net
->nft
.commit_list
);
3991 net
->nft
.base_seq
= 1;
3995 static struct pernet_operations nf_tables_net_ops
= {
3996 .init
= nf_tables_init_net
,
3999 static int __init
nf_tables_module_init(void)
4003 info
= kmalloc(sizeof(struct nft_expr_info
) * NFT_RULE_MAXEXPRS
,
4010 err
= nf_tables_core_module_init();
4014 err
= nfnetlink_subsys_register(&nf_tables_subsys
);
4018 pr_info("nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>\n");
4019 return register_pernet_subsys(&nf_tables_net_ops
);
4021 nf_tables_core_module_exit();
4028 static void __exit
nf_tables_module_exit(void)
4030 unregister_pernet_subsys(&nf_tables_net_ops
);
4031 nfnetlink_subsys_unregister(&nf_tables_subsys
);
4032 nf_tables_core_module_exit();
4036 module_init(nf_tables_module_init
);
4037 module_exit(nf_tables_module_exit
);
4039 MODULE_LICENSE("GPL");
4040 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
4041 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFTABLES
);