2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfnetlink.
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
6 * (C) 2007 by Patrick McHardy <kaber@trash.net>
8 * Based on the old ipv4-only ip_queue.c:
9 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
10 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
17 #include <linux/module.h>
18 #include <linux/skbuff.h>
19 #include <linux/init.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/proc_fs.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <linux/netfilter/nfnetlink.h>
29 #include <linux/netfilter/nfnetlink_queue.h>
30 #include <linux/list.h>
32 #include <net/netfilter/nf_queue.h>
33 #include <net/netfilter/nfnetlink_queue.h>
35 #include <linux/atomic.h>
37 #ifdef CONFIG_BRIDGE_NETFILTER
38 #include "../bridge/br_private.h"
41 #define NFQNL_QMAX_DEFAULT 1024
43 struct nfqnl_instance
{
44 struct hlist_node hlist
; /* global list of queues */
48 unsigned int queue_maxlen
;
49 unsigned int copy_range
;
50 unsigned int queue_dropped
;
51 unsigned int queue_user_dropped
;
54 u_int16_t queue_num
; /* number of this queue */
56 u_int32_t flags
; /* Set using NFQA_CFG_FLAGS */
58 * Following fields are dirtied for each queued packet,
59 * keep them in same cache line if possible.
62 unsigned int queue_total
;
63 unsigned int id_sequence
; /* 'sequence' of pkt ids */
64 struct list_head queue_list
; /* packets in queue */
67 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
69 static DEFINE_SPINLOCK(instances_lock
);
71 #define INSTANCE_BUCKETS 16
72 static struct hlist_head instance_table
[INSTANCE_BUCKETS
] __read_mostly
;
74 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
76 return ((queue_num
>> 8) | queue_num
) % INSTANCE_BUCKETS
;
79 static struct nfqnl_instance
*
80 instance_lookup(u_int16_t queue_num
)
82 struct hlist_head
*head
;
83 struct hlist_node
*pos
;
84 struct nfqnl_instance
*inst
;
86 head
= &instance_table
[instance_hashfn(queue_num
)];
87 hlist_for_each_entry_rcu(inst
, pos
, head
, hlist
) {
88 if (inst
->queue_num
== queue_num
)
94 static struct nfqnl_instance
*
95 instance_create(u_int16_t queue_num
, int portid
)
97 struct nfqnl_instance
*inst
;
101 spin_lock(&instances_lock
);
102 if (instance_lookup(queue_num
)) {
107 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
113 inst
->queue_num
= queue_num
;
114 inst
->peer_portid
= portid
;
115 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
116 inst
->copy_range
= 0xfffff;
117 inst
->copy_mode
= NFQNL_COPY_NONE
;
118 spin_lock_init(&inst
->lock
);
119 INIT_LIST_HEAD(&inst
->queue_list
);
121 if (!try_module_get(THIS_MODULE
)) {
126 h
= instance_hashfn(queue_num
);
127 hlist_add_head_rcu(&inst
->hlist
, &instance_table
[h
]);
129 spin_unlock(&instances_lock
);
136 spin_unlock(&instances_lock
);
140 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
144 instance_destroy_rcu(struct rcu_head
*head
)
146 struct nfqnl_instance
*inst
= container_of(head
, struct nfqnl_instance
,
149 nfqnl_flush(inst
, NULL
, 0);
151 module_put(THIS_MODULE
);
155 __instance_destroy(struct nfqnl_instance
*inst
)
157 hlist_del_rcu(&inst
->hlist
);
158 call_rcu(&inst
->rcu
, instance_destroy_rcu
);
162 instance_destroy(struct nfqnl_instance
*inst
)
164 spin_lock(&instances_lock
);
165 __instance_destroy(inst
);
166 spin_unlock(&instances_lock
);
170 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
172 list_add_tail(&entry
->list
, &queue
->queue_list
);
173 queue
->queue_total
++;
177 __dequeue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
179 list_del(&entry
->list
);
180 queue
->queue_total
--;
183 static struct nf_queue_entry
*
184 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
186 struct nf_queue_entry
*entry
= NULL
, *i
;
188 spin_lock_bh(&queue
->lock
);
190 list_for_each_entry(i
, &queue
->queue_list
, list
) {
198 __dequeue_entry(queue
, entry
);
200 spin_unlock_bh(&queue
->lock
);
206 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
208 struct nf_queue_entry
*entry
, *next
;
210 spin_lock_bh(&queue
->lock
);
211 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
212 if (!cmpfn
|| cmpfn(entry
, data
)) {
213 list_del(&entry
->list
);
214 queue
->queue_total
--;
215 nf_reinject(entry
, NF_DROP
);
218 spin_unlock_bh(&queue
->lock
);
221 static struct sk_buff
*
222 nfqnl_build_packet_message(struct nfqnl_instance
*queue
,
223 struct nf_queue_entry
*entry
,
224 __be32
**packet_id_ptr
)
226 sk_buff_data_t old_tail
;
228 size_t data_len
= 0, cap_len
= 0;
231 struct nfqnl_msg_packet_hdr
*pmsg
;
232 struct nlmsghdr
*nlh
;
233 struct nfgenmsg
*nfmsg
;
234 struct sk_buff
*entskb
= entry
->skb
;
235 struct net_device
*indev
;
236 struct net_device
*outdev
;
237 struct nf_conn
*ct
= NULL
;
238 enum ip_conntrack_info
uninitialized_var(ctinfo
);
240 size
= NLMSG_SPACE(sizeof(struct nfgenmsg
))
241 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
242 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
243 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
244 #ifdef CONFIG_BRIDGE_NETFILTER
245 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
246 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
248 + nla_total_size(sizeof(u_int32_t
)) /* mark */
249 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
250 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
)
251 + nla_total_size(sizeof(u_int32_t
))); /* cap_len */
253 outdev
= entry
->outdev
;
255 switch ((enum nfqnl_config_mode
)ACCESS_ONCE(queue
->copy_mode
)) {
256 case NFQNL_COPY_META
:
257 case NFQNL_COPY_NONE
:
260 case NFQNL_COPY_PACKET
:
261 if (entskb
->ip_summed
== CHECKSUM_PARTIAL
&&
262 skb_checksum_help(entskb
))
265 data_len
= ACCESS_ONCE(queue
->copy_range
);
266 if (data_len
== 0 || data_len
> entskb
->len
)
267 data_len
= entskb
->len
;
269 size
+= nla_total_size(data_len
);
270 cap_len
= entskb
->len
;
274 if (queue
->flags
& NFQA_CFG_F_CONNTRACK
)
275 ct
= nfqnl_ct_get(entskb
, &size
, &ctinfo
);
277 skb
= alloc_skb(size
, GFP_ATOMIC
);
281 old_tail
= skb
->tail
;
282 nlh
= nlmsg_put(skb
, 0, 0,
283 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
284 sizeof(struct nfgenmsg
), 0);
289 nfmsg
= nlmsg_data(nlh
);
290 nfmsg
->nfgen_family
= entry
->pf
;
291 nfmsg
->version
= NFNETLINK_V0
;
292 nfmsg
->res_id
= htons(queue
->queue_num
);
294 nla
= __nla_reserve(skb
, NFQA_PACKET_HDR
, sizeof(*pmsg
));
295 pmsg
= nla_data(nla
);
296 pmsg
->hw_protocol
= entskb
->protocol
;
297 pmsg
->hook
= entry
->hook
;
298 *packet_id_ptr
= &pmsg
->packet_id
;
300 indev
= entry
->indev
;
302 #ifndef CONFIG_BRIDGE_NETFILTER
303 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
, htonl(indev
->ifindex
)))
304 goto nla_put_failure
;
306 if (entry
->pf
== PF_BRIDGE
) {
307 /* Case 1: indev is physical input device, we need to
308 * look for bridge group (when called from
309 * netfilter_bridge) */
310 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
311 htonl(indev
->ifindex
)) ||
312 /* this is the bridge group "brX" */
313 /* rcu_read_lock()ed by __nf_queue */
314 nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
315 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
316 goto nla_put_failure
;
318 /* Case 2: indev is bridge group, we need to look for
319 * physical device (when called from ipv4) */
320 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
321 htonl(indev
->ifindex
)))
322 goto nla_put_failure
;
323 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physindev
&&
324 nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
325 htonl(entskb
->nf_bridge
->physindev
->ifindex
)))
326 goto nla_put_failure
;
332 #ifndef CONFIG_BRIDGE_NETFILTER
333 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
, htonl(outdev
->ifindex
)))
334 goto nla_put_failure
;
336 if (entry
->pf
== PF_BRIDGE
) {
337 /* Case 1: outdev is physical output device, we need to
338 * look for bridge group (when called from
339 * netfilter_bridge) */
340 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
341 htonl(outdev
->ifindex
)) ||
342 /* this is the bridge group "brX" */
343 /* rcu_read_lock()ed by __nf_queue */
344 nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
345 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
346 goto nla_put_failure
;
348 /* Case 2: outdev is bridge group, we need to look for
349 * physical output device (when called from ipv4) */
350 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
351 htonl(outdev
->ifindex
)))
352 goto nla_put_failure
;
353 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physoutdev
&&
354 nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
355 htonl(entskb
->nf_bridge
->physoutdev
->ifindex
)))
356 goto nla_put_failure
;
362 nla_put_be32(skb
, NFQA_MARK
, htonl(entskb
->mark
)))
363 goto nla_put_failure
;
365 if (indev
&& entskb
->dev
&&
366 entskb
->mac_header
!= entskb
->network_header
) {
367 struct nfqnl_msg_packet_hw phw
;
368 int len
= dev_parse_header(entskb
, phw
.hw_addr
);
370 phw
.hw_addrlen
= htons(len
);
371 if (nla_put(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
))
372 goto nla_put_failure
;
376 if (entskb
->tstamp
.tv64
) {
377 struct nfqnl_msg_packet_timestamp ts
;
378 struct timeval tv
= ktime_to_timeval(entskb
->tstamp
);
379 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
380 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
382 if (nla_put(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
))
383 goto nla_put_failure
;
388 int sz
= nla_attr_size(data_len
);
390 if (skb_tailroom(skb
) < nla_total_size(data_len
)) {
391 printk(KERN_WARNING
"nf_queue: no tailroom!\n");
396 nla
= (struct nlattr
*)skb_put(skb
, nla_total_size(data_len
));
397 nla
->nla_type
= NFQA_PAYLOAD
;
400 if (skb_copy_bits(entskb
, 0, nla_data(nla
), data_len
))
404 if (ct
&& nfqnl_ct_put(skb
, ct
, ctinfo
) < 0)
405 goto nla_put_failure
;
407 if (cap_len
> 0 && nla_put_be32(skb
, NFQA_CAP_LEN
, htonl(cap_len
)))
408 goto nla_put_failure
;
410 nlh
->nlmsg_len
= skb
->tail
- old_tail
;
415 net_err_ratelimited("nf_queue: error creating packet message\n");
420 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
422 struct sk_buff
*nskb
;
423 struct nfqnl_instance
*queue
;
425 __be32
*packet_id_ptr
;
428 /* rcu_read_lock()ed by nf_hook_slow() */
429 queue
= instance_lookup(queuenum
);
435 if (queue
->copy_mode
== NFQNL_COPY_NONE
) {
440 nskb
= nfqnl_build_packet_message(queue
, entry
, &packet_id_ptr
);
445 spin_lock_bh(&queue
->lock
);
447 if (!queue
->peer_portid
) {
449 goto err_out_free_nskb
;
451 if (queue
->queue_total
>= queue
->queue_maxlen
) {
452 if (queue
->flags
& NFQA_CFG_F_FAIL_OPEN
) {
456 queue
->queue_dropped
++;
457 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
460 goto err_out_free_nskb
;
462 entry
->id
= ++queue
->id_sequence
;
463 *packet_id_ptr
= htonl(entry
->id
);
465 /* nfnetlink_unicast will either free the nskb or add it to a socket */
466 err
= nfnetlink_unicast(nskb
, &init_net
, queue
->peer_portid
, MSG_DONTWAIT
);
468 queue
->queue_user_dropped
++;
472 __enqueue_entry(queue
, entry
);
474 spin_unlock_bh(&queue
->lock
);
480 spin_unlock_bh(&queue
->lock
);
482 nf_reinject(entry
, NF_ACCEPT
);
488 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
, int diff
)
490 struct sk_buff
*nskb
;
493 if (pskb_trim(e
->skb
, data_len
))
495 } else if (diff
> 0) {
496 if (data_len
> 0xFFFF)
498 if (diff
> skb_tailroom(e
->skb
)) {
499 nskb
= skb_copy_expand(e
->skb
, skb_headroom(e
->skb
),
502 printk(KERN_WARNING
"nf_queue: OOM "
503 "in mangle, dropping packet\n");
509 skb_put(e
->skb
, diff
);
511 if (!skb_make_writable(e
->skb
, data_len
))
513 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
514 e
->skb
->ip_summed
= CHECKSUM_NONE
;
519 nfqnl_set_mode(struct nfqnl_instance
*queue
,
520 unsigned char mode
, unsigned int range
)
524 spin_lock_bh(&queue
->lock
);
526 case NFQNL_COPY_NONE
:
527 case NFQNL_COPY_META
:
528 queue
->copy_mode
= mode
;
529 queue
->copy_range
= 0;
532 case NFQNL_COPY_PACKET
:
533 queue
->copy_mode
= mode
;
534 /* We're using struct nlattr which has 16bit nla_len. Note that
535 * nla_len includes the header length. Thus, the maximum packet
536 * length that we support is 65531 bytes. We send truncated
537 * packets if the specified length is larger than that.
539 if (range
> 0xffff - NLA_HDRLEN
)
540 queue
->copy_range
= 0xffff - NLA_HDRLEN
;
542 queue
->copy_range
= range
;
549 spin_unlock_bh(&queue
->lock
);
555 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
558 if (entry
->indev
->ifindex
== ifindex
)
561 if (entry
->outdev
->ifindex
== ifindex
)
563 #ifdef CONFIG_BRIDGE_NETFILTER
564 if (entry
->skb
->nf_bridge
) {
565 if (entry
->skb
->nf_bridge
->physindev
&&
566 entry
->skb
->nf_bridge
->physindev
->ifindex
== ifindex
)
568 if (entry
->skb
->nf_bridge
->physoutdev
&&
569 entry
->skb
->nf_bridge
->physoutdev
->ifindex
== ifindex
)
576 /* drop all packets with either indev or outdev == ifindex from all queue
579 nfqnl_dev_drop(int ifindex
)
585 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
586 struct hlist_node
*tmp
;
587 struct nfqnl_instance
*inst
;
588 struct hlist_head
*head
= &instance_table
[i
];
590 hlist_for_each_entry_rcu(inst
, tmp
, head
, hlist
)
591 nfqnl_flush(inst
, dev_cmp
, ifindex
);
597 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
600 nfqnl_rcv_dev_event(struct notifier_block
*this,
601 unsigned long event
, void *ptr
)
603 struct net_device
*dev
= ptr
;
605 if (!net_eq(dev_net(dev
), &init_net
))
608 /* Drop any packets associated with the downed device */
609 if (event
== NETDEV_DOWN
)
610 nfqnl_dev_drop(dev
->ifindex
);
614 static struct notifier_block nfqnl_dev_notifier
= {
615 .notifier_call
= nfqnl_rcv_dev_event
,
619 nfqnl_rcv_nl_event(struct notifier_block
*this,
620 unsigned long event
, void *ptr
)
622 struct netlink_notify
*n
= ptr
;
624 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
627 /* destroy all instances for this portid */
628 spin_lock(&instances_lock
);
629 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
630 struct hlist_node
*tmp
, *t2
;
631 struct nfqnl_instance
*inst
;
632 struct hlist_head
*head
= &instance_table
[i
];
634 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
635 if ((n
->net
== &init_net
) &&
636 (n
->portid
== inst
->peer_portid
))
637 __instance_destroy(inst
);
640 spin_unlock(&instances_lock
);
645 static struct notifier_block nfqnl_rtnl_notifier
= {
646 .notifier_call
= nfqnl_rcv_nl_event
,
649 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
650 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
651 [NFQA_MARK
] = { .type
= NLA_U32
},
652 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
653 [NFQA_CT
] = { .type
= NLA_UNSPEC
},
656 static const struct nla_policy nfqa_verdict_batch_policy
[NFQA_MAX
+1] = {
657 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
658 [NFQA_MARK
] = { .type
= NLA_U32
},
661 static struct nfqnl_instance
*verdict_instance_lookup(u16 queue_num
, int nlportid
)
663 struct nfqnl_instance
*queue
;
665 queue
= instance_lookup(queue_num
);
667 return ERR_PTR(-ENODEV
);
669 if (queue
->peer_portid
!= nlportid
)
670 return ERR_PTR(-EPERM
);
675 static struct nfqnl_msg_verdict_hdr
*
676 verdicthdr_get(const struct nlattr
* const nfqa
[])
678 struct nfqnl_msg_verdict_hdr
*vhdr
;
679 unsigned int verdict
;
681 if (!nfqa
[NFQA_VERDICT_HDR
])
684 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
685 verdict
= ntohl(vhdr
->verdict
) & NF_VERDICT_MASK
;
686 if (verdict
> NF_MAX_VERDICT
|| verdict
== NF_STOLEN
)
691 static int nfq_id_after(unsigned int id
, unsigned int max
)
693 return (int)(id
- max
) > 0;
697 nfqnl_recv_verdict_batch(struct sock
*ctnl
, struct sk_buff
*skb
,
698 const struct nlmsghdr
*nlh
,
699 const struct nlattr
* const nfqa
[])
701 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
702 struct nf_queue_entry
*entry
, *tmp
;
703 unsigned int verdict
, maxid
;
704 struct nfqnl_msg_verdict_hdr
*vhdr
;
705 struct nfqnl_instance
*queue
;
706 LIST_HEAD(batch_list
);
707 u16 queue_num
= ntohs(nfmsg
->res_id
);
709 queue
= verdict_instance_lookup(queue_num
, NETLINK_CB(skb
).portid
);
711 return PTR_ERR(queue
);
713 vhdr
= verdicthdr_get(nfqa
);
717 verdict
= ntohl(vhdr
->verdict
);
718 maxid
= ntohl(vhdr
->id
);
720 spin_lock_bh(&queue
->lock
);
722 list_for_each_entry_safe(entry
, tmp
, &queue
->queue_list
, list
) {
723 if (nfq_id_after(entry
->id
, maxid
))
725 __dequeue_entry(queue
, entry
);
726 list_add_tail(&entry
->list
, &batch_list
);
729 spin_unlock_bh(&queue
->lock
);
731 if (list_empty(&batch_list
))
734 list_for_each_entry_safe(entry
, tmp
, &batch_list
, list
) {
736 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
737 nf_reinject(entry
, verdict
);
743 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
744 const struct nlmsghdr
*nlh
,
745 const struct nlattr
* const nfqa
[])
747 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
748 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
750 struct nfqnl_msg_verdict_hdr
*vhdr
;
751 struct nfqnl_instance
*queue
;
752 unsigned int verdict
;
753 struct nf_queue_entry
*entry
;
754 enum ip_conntrack_info
uninitialized_var(ctinfo
);
755 struct nf_conn
*ct
= NULL
;
757 queue
= instance_lookup(queue_num
);
760 queue
= verdict_instance_lookup(queue_num
, NETLINK_CB(skb
).portid
);
762 return PTR_ERR(queue
);
764 vhdr
= verdicthdr_get(nfqa
);
768 verdict
= ntohl(vhdr
->verdict
);
770 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
775 if (nfqa
[NFQA_CT
] && (queue
->flags
& NFQA_CFG_F_CONNTRACK
))
776 ct
= nfqnl_ct_parse(entry
->skb
, nfqa
[NFQA_CT
], &ctinfo
);
778 if (nfqa
[NFQA_PAYLOAD
]) {
779 u16 payload_len
= nla_len(nfqa
[NFQA_PAYLOAD
]);
780 int diff
= payload_len
- entry
->skb
->len
;
782 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
783 payload_len
, entry
, diff
) < 0)
787 nfqnl_ct_seq_adjust(skb
, ct
, ctinfo
, diff
);
792 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
794 nf_reinject(entry
, verdict
);
799 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
800 const struct nlmsghdr
*nlh
,
801 const struct nlattr
* const nfqa
[])
806 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
807 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
808 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
811 static const struct nf_queue_handler nfqh
= {
812 .outfn
= &nfqnl_enqueue_packet
,
816 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
817 const struct nlmsghdr
*nlh
,
818 const struct nlattr
* const nfqa
[])
820 struct nfgenmsg
*nfmsg
= nlmsg_data(nlh
);
821 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
822 struct nfqnl_instance
*queue
;
823 struct nfqnl_msg_config_cmd
*cmd
= NULL
;
826 if (nfqa
[NFQA_CFG_CMD
]) {
827 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
829 /* Obsolete commands without queue context */
830 switch (cmd
->command
) {
831 case NFQNL_CFG_CMD_PF_BIND
: return 0;
832 case NFQNL_CFG_CMD_PF_UNBIND
: return 0;
837 queue
= instance_lookup(queue_num
);
838 if (queue
&& queue
->peer_portid
!= NETLINK_CB(skb
).portid
) {
844 switch (cmd
->command
) {
845 case NFQNL_CFG_CMD_BIND
:
850 queue
= instance_create(queue_num
, NETLINK_CB(skb
).portid
);
852 ret
= PTR_ERR(queue
);
856 case NFQNL_CFG_CMD_UNBIND
:
861 instance_destroy(queue
);
863 case NFQNL_CFG_CMD_PF_BIND
:
864 case NFQNL_CFG_CMD_PF_UNBIND
:
872 if (nfqa
[NFQA_CFG_PARAMS
]) {
873 struct nfqnl_msg_config_params
*params
;
879 params
= nla_data(nfqa
[NFQA_CFG_PARAMS
]);
880 nfqnl_set_mode(queue
, params
->copy_mode
,
881 ntohl(params
->copy_range
));
884 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
885 __be32
*queue_maxlen
;
891 queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
892 spin_lock_bh(&queue
->lock
);
893 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
894 spin_unlock_bh(&queue
->lock
);
897 if (nfqa
[NFQA_CFG_FLAGS
]) {
905 if (!nfqa
[NFQA_CFG_MASK
]) {
906 /* A mask is needed to specify which flags are being
913 flags
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_FLAGS
]));
914 mask
= ntohl(nla_get_be32(nfqa
[NFQA_CFG_MASK
]));
916 if (flags
>= NFQA_CFG_F_MAX
) {
921 spin_lock_bh(&queue
->lock
);
922 queue
->flags
&= ~mask
;
923 queue
->flags
|= flags
& mask
;
924 spin_unlock_bh(&queue
->lock
);
932 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
933 [NFQNL_MSG_PACKET
] = { .call_rcu
= nfqnl_recv_unsupp
,
934 .attr_count
= NFQA_MAX
, },
935 [NFQNL_MSG_VERDICT
] = { .call_rcu
= nfqnl_recv_verdict
,
936 .attr_count
= NFQA_MAX
,
937 .policy
= nfqa_verdict_policy
},
938 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
939 .attr_count
= NFQA_CFG_MAX
,
940 .policy
= nfqa_cfg_policy
},
941 [NFQNL_MSG_VERDICT_BATCH
]={ .call_rcu
= nfqnl_recv_verdict_batch
,
942 .attr_count
= NFQA_MAX
,
943 .policy
= nfqa_verdict_batch_policy
},
946 static const struct nfnetlink_subsystem nfqnl_subsys
= {
948 .subsys_id
= NFNL_SUBSYS_QUEUE
,
949 .cb_count
= NFQNL_MSG_MAX
,
953 #ifdef CONFIG_PROC_FS
958 static struct hlist_node
*get_first(struct seq_file
*seq
)
960 struct iter_state
*st
= seq
->private;
965 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
966 if (!hlist_empty(&instance_table
[st
->bucket
]))
967 return instance_table
[st
->bucket
].first
;
972 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
974 struct iter_state
*st
= seq
->private;
978 if (++st
->bucket
>= INSTANCE_BUCKETS
)
981 h
= instance_table
[st
->bucket
].first
;
986 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
988 struct hlist_node
*head
;
989 head
= get_first(seq
);
992 while (pos
&& (head
= get_next(seq
, head
)))
994 return pos
? NULL
: head
;
997 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
998 __acquires(instances_lock
)
1000 spin_lock(&instances_lock
);
1001 return get_idx(seq
, *pos
);
1004 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
1007 return get_next(s
, v
);
1010 static void seq_stop(struct seq_file
*s
, void *v
)
1011 __releases(instances_lock
)
1013 spin_unlock(&instances_lock
);
1016 static int seq_show(struct seq_file
*s
, void *v
)
1018 const struct nfqnl_instance
*inst
= v
;
1020 return seq_printf(s
, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
1022 inst
->peer_portid
, inst
->queue_total
,
1023 inst
->copy_mode
, inst
->copy_range
,
1024 inst
->queue_dropped
, inst
->queue_user_dropped
,
1025 inst
->id_sequence
, 1);
1028 static const struct seq_operations nfqnl_seq_ops
= {
1035 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
1037 return seq_open_private(file
, &nfqnl_seq_ops
,
1038 sizeof(struct iter_state
));
1041 static const struct file_operations nfqnl_file_ops
= {
1042 .owner
= THIS_MODULE
,
1045 .llseek
= seq_lseek
,
1046 .release
= seq_release_private
,
1049 #endif /* PROC_FS */
1051 static int __init
nfnetlink_queue_init(void)
1053 int i
, status
= -ENOMEM
;
1055 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
1056 INIT_HLIST_HEAD(&instance_table
[i
]);
1058 netlink_register_notifier(&nfqnl_rtnl_notifier
);
1059 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
1061 printk(KERN_ERR
"nf_queue: failed to create netlink socket\n");
1062 goto cleanup_netlink_notifier
;
1065 #ifdef CONFIG_PROC_FS
1066 if (!proc_create("nfnetlink_queue", 0440,
1067 proc_net_netfilter
, &nfqnl_file_ops
))
1068 goto cleanup_subsys
;
1071 register_netdevice_notifier(&nfqnl_dev_notifier
);
1072 nf_register_queue_handler(&nfqh
);
1075 #ifdef CONFIG_PROC_FS
1077 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1079 cleanup_netlink_notifier
:
1080 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1084 static void __exit
nfnetlink_queue_fini(void)
1086 nf_unregister_queue_handler();
1087 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1088 #ifdef CONFIG_PROC_FS
1089 remove_proc_entry("nfnetlink_queue", proc_net_netfilter
);
1091 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1092 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1094 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1097 MODULE_DESCRIPTION("netfilter packet queue handler");
1098 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1099 MODULE_LICENSE("GPL");
1100 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1102 module_init(nfnetlink_queue_init
);
1103 module_exit(nfnetlink_queue_fini
);