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>
34 #include <linux/atomic.h>
36 #ifdef CONFIG_BRIDGE_NETFILTER
37 #include "../bridge/br_private.h"
40 #define NFQNL_QMAX_DEFAULT 1024
42 struct nfqnl_instance
{
43 struct hlist_node hlist
; /* global list of queues */
47 unsigned int queue_maxlen
;
48 unsigned int copy_range
;
49 unsigned int queue_dropped
;
50 unsigned int queue_user_dropped
;
53 u_int16_t queue_num
; /* number of this queue */
56 * Following fields are dirtied for each queued packet,
57 * keep them in same cache line if possible.
60 unsigned int queue_total
;
61 unsigned int id_sequence
; /* 'sequence' of pkt ids */
62 struct list_head queue_list
; /* packets in queue */
65 typedef int (*nfqnl_cmpfn
)(struct nf_queue_entry
*, unsigned long);
67 static DEFINE_SPINLOCK(instances_lock
);
69 #define INSTANCE_BUCKETS 16
70 static struct hlist_head instance_table
[INSTANCE_BUCKETS
] __read_mostly
;
72 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
74 return ((queue_num
>> 8) | queue_num
) % INSTANCE_BUCKETS
;
77 static struct nfqnl_instance
*
78 instance_lookup(u_int16_t queue_num
)
80 struct hlist_head
*head
;
81 struct hlist_node
*pos
;
82 struct nfqnl_instance
*inst
;
84 head
= &instance_table
[instance_hashfn(queue_num
)];
85 hlist_for_each_entry_rcu(inst
, pos
, head
, hlist
) {
86 if (inst
->queue_num
== queue_num
)
92 static struct nfqnl_instance
*
93 instance_create(u_int16_t queue_num
, int pid
)
95 struct nfqnl_instance
*inst
;
99 spin_lock(&instances_lock
);
100 if (instance_lookup(queue_num
)) {
105 inst
= kzalloc(sizeof(*inst
), GFP_ATOMIC
);
111 inst
->queue_num
= queue_num
;
112 inst
->peer_pid
= pid
;
113 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
114 inst
->copy_range
= 0xfffff;
115 inst
->copy_mode
= NFQNL_COPY_NONE
;
116 spin_lock_init(&inst
->lock
);
117 INIT_LIST_HEAD(&inst
->queue_list
);
119 if (!try_module_get(THIS_MODULE
)) {
124 h
= instance_hashfn(queue_num
);
125 hlist_add_head_rcu(&inst
->hlist
, &instance_table
[h
]);
127 spin_unlock(&instances_lock
);
134 spin_unlock(&instances_lock
);
138 static void nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
142 instance_destroy_rcu(struct rcu_head
*head
)
144 struct nfqnl_instance
*inst
= container_of(head
, struct nfqnl_instance
,
147 nfqnl_flush(inst
, NULL
, 0);
149 module_put(THIS_MODULE
);
153 __instance_destroy(struct nfqnl_instance
*inst
)
155 hlist_del_rcu(&inst
->hlist
);
156 call_rcu(&inst
->rcu
, instance_destroy_rcu
);
160 instance_destroy(struct nfqnl_instance
*inst
)
162 spin_lock(&instances_lock
);
163 __instance_destroy(inst
);
164 spin_unlock(&instances_lock
);
168 __enqueue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
170 list_add_tail(&entry
->list
, &queue
->queue_list
);
171 queue
->queue_total
++;
175 __dequeue_entry(struct nfqnl_instance
*queue
, struct nf_queue_entry
*entry
)
177 list_del(&entry
->list
);
178 queue
->queue_total
--;
181 static struct nf_queue_entry
*
182 find_dequeue_entry(struct nfqnl_instance
*queue
, unsigned int id
)
184 struct nf_queue_entry
*entry
= NULL
, *i
;
186 spin_lock_bh(&queue
->lock
);
188 list_for_each_entry(i
, &queue
->queue_list
, list
) {
196 __dequeue_entry(queue
, entry
);
198 spin_unlock_bh(&queue
->lock
);
204 nfqnl_flush(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
, unsigned long data
)
206 struct nf_queue_entry
*entry
, *next
;
208 spin_lock_bh(&queue
->lock
);
209 list_for_each_entry_safe(entry
, next
, &queue
->queue_list
, list
) {
210 if (!cmpfn
|| cmpfn(entry
, data
)) {
211 list_del(&entry
->list
);
212 queue
->queue_total
--;
213 nf_reinject(entry
, NF_DROP
);
216 spin_unlock_bh(&queue
->lock
);
219 static struct sk_buff
*
220 nfqnl_build_packet_message(struct nfqnl_instance
*queue
,
221 struct nf_queue_entry
*entry
,
222 __be32
**packet_id_ptr
)
224 sk_buff_data_t old_tail
;
229 struct nfqnl_msg_packet_hdr
*pmsg
;
230 struct nlmsghdr
*nlh
;
231 struct nfgenmsg
*nfmsg
;
232 struct sk_buff
*entskb
= entry
->skb
;
233 struct net_device
*indev
;
234 struct net_device
*outdev
;
236 size
= NLMSG_SPACE(sizeof(struct nfgenmsg
))
237 + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr
))
238 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
239 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
240 #ifdef CONFIG_BRIDGE_NETFILTER
241 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
242 + nla_total_size(sizeof(u_int32_t
)) /* ifindex */
244 + nla_total_size(sizeof(u_int32_t
)) /* mark */
245 + nla_total_size(sizeof(struct nfqnl_msg_packet_hw
))
246 + nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp
));
248 outdev
= entry
->outdev
;
250 switch ((enum nfqnl_config_mode
)ACCESS_ONCE(queue
->copy_mode
)) {
251 case NFQNL_COPY_META
:
252 case NFQNL_COPY_NONE
:
255 case NFQNL_COPY_PACKET
:
256 if (entskb
->ip_summed
== CHECKSUM_PARTIAL
&&
257 skb_checksum_help(entskb
))
260 data_len
= ACCESS_ONCE(queue
->copy_range
);
261 if (data_len
== 0 || data_len
> entskb
->len
)
262 data_len
= entskb
->len
;
264 size
+= nla_total_size(data_len
);
269 skb
= alloc_skb(size
, GFP_ATOMIC
);
273 old_tail
= skb
->tail
;
274 nlh
= NLMSG_PUT(skb
, 0, 0,
275 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
276 sizeof(struct nfgenmsg
));
277 nfmsg
= NLMSG_DATA(nlh
);
278 nfmsg
->nfgen_family
= entry
->pf
;
279 nfmsg
->version
= NFNETLINK_V0
;
280 nfmsg
->res_id
= htons(queue
->queue_num
);
282 nla
= __nla_reserve(skb
, NFQA_PACKET_HDR
, sizeof(*pmsg
));
283 pmsg
= nla_data(nla
);
284 pmsg
->hw_protocol
= entskb
->protocol
;
285 pmsg
->hook
= entry
->hook
;
286 *packet_id_ptr
= &pmsg
->packet_id
;
288 indev
= entry
->indev
;
290 #ifndef CONFIG_BRIDGE_NETFILTER
291 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
, htonl(indev
->ifindex
)))
292 goto nla_put_failure
;
294 if (entry
->pf
== PF_BRIDGE
) {
295 /* Case 1: indev is physical input device, we need to
296 * look for bridge group (when called from
297 * netfilter_bridge) */
298 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
299 htonl(indev
->ifindex
)) ||
300 /* this is the bridge group "brX" */
301 /* rcu_read_lock()ed by __nf_queue */
302 nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
303 htonl(br_port_get_rcu(indev
)->br
->dev
->ifindex
)))
304 goto nla_put_failure
;
306 /* Case 2: indev is bridge group, we need to look for
307 * physical device (when called from ipv4) */
308 if (nla_put_be32(skb
, NFQA_IFINDEX_INDEV
,
309 htonl(indev
->ifindex
)))
310 goto nla_put_failure
;
311 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physindev
&&
312 nla_put_be32(skb
, NFQA_IFINDEX_PHYSINDEV
,
313 htonl(entskb
->nf_bridge
->physindev
->ifindex
)))
314 goto nla_put_failure
;
320 #ifndef CONFIG_BRIDGE_NETFILTER
321 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
, htonl(outdev
->ifindex
)))
322 goto nla_put_failure
;
324 if (entry
->pf
== PF_BRIDGE
) {
325 /* Case 1: outdev is physical output device, we need to
326 * look for bridge group (when called from
327 * netfilter_bridge) */
328 if (nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
329 htonl(outdev
->ifindex
)) ||
330 /* this is the bridge group "brX" */
331 /* rcu_read_lock()ed by __nf_queue */
332 nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
333 htonl(br_port_get_rcu(outdev
)->br
->dev
->ifindex
)))
334 goto nla_put_failure
;
336 /* Case 2: outdev is bridge group, we need to look for
337 * physical output device (when called from ipv4) */
338 if (nla_put_be32(skb
, NFQA_IFINDEX_OUTDEV
,
339 htonl(outdev
->ifindex
)))
340 goto nla_put_failure
;
341 if (entskb
->nf_bridge
&& entskb
->nf_bridge
->physoutdev
&&
342 nla_put_be32(skb
, NFQA_IFINDEX_PHYSOUTDEV
,
343 htonl(entskb
->nf_bridge
->physoutdev
->ifindex
)))
344 goto nla_put_failure
;
350 nla_put_be32(skb
, NFQA_MARK
, htonl(entskb
->mark
)))
351 goto nla_put_failure
;
353 if (indev
&& entskb
->dev
&&
354 entskb
->mac_header
!= entskb
->network_header
) {
355 struct nfqnl_msg_packet_hw phw
;
356 int len
= dev_parse_header(entskb
, phw
.hw_addr
);
358 phw
.hw_addrlen
= htons(len
);
359 if (nla_put(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
))
360 goto nla_put_failure
;
364 if (entskb
->tstamp
.tv64
) {
365 struct nfqnl_msg_packet_timestamp ts
;
366 struct timeval tv
= ktime_to_timeval(entskb
->tstamp
);
367 ts
.sec
= cpu_to_be64(tv
.tv_sec
);
368 ts
.usec
= cpu_to_be64(tv
.tv_usec
);
370 if (nla_put(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
))
371 goto nla_put_failure
;
376 int sz
= nla_attr_size(data_len
);
378 if (skb_tailroom(skb
) < nla_total_size(data_len
)) {
379 printk(KERN_WARNING
"nf_queue: no tailroom!\n");
383 nla
= (struct nlattr
*)skb_put(skb
, nla_total_size(data_len
));
384 nla
->nla_type
= NFQA_PAYLOAD
;
387 if (skb_copy_bits(entskb
, 0, nla_data(nla
), data_len
))
391 nlh
->nlmsg_len
= skb
->tail
- old_tail
;
398 net_err_ratelimited("nf_queue: error creating packet message\n");
403 nfqnl_enqueue_packet(struct nf_queue_entry
*entry
, unsigned int queuenum
)
405 struct sk_buff
*nskb
;
406 struct nfqnl_instance
*queue
;
408 __be32
*packet_id_ptr
;
410 /* rcu_read_lock()ed by nf_hook_slow() */
411 queue
= instance_lookup(queuenum
);
417 if (queue
->copy_mode
== NFQNL_COPY_NONE
) {
422 nskb
= nfqnl_build_packet_message(queue
, entry
, &packet_id_ptr
);
427 spin_lock_bh(&queue
->lock
);
429 if (!queue
->peer_pid
) {
431 goto err_out_free_nskb
;
433 if (queue
->queue_total
>= queue
->queue_maxlen
) {
434 queue
->queue_dropped
++;
435 net_warn_ratelimited("nf_queue: full at %d entries, dropping packets(s)\n",
437 goto err_out_free_nskb
;
439 entry
->id
= ++queue
->id_sequence
;
440 *packet_id_ptr
= htonl(entry
->id
);
442 /* nfnetlink_unicast will either free the nskb or add it to a socket */
443 err
= nfnetlink_unicast(nskb
, &init_net
, queue
->peer_pid
, MSG_DONTWAIT
);
445 queue
->queue_user_dropped
++;
449 __enqueue_entry(queue
, entry
);
451 spin_unlock_bh(&queue
->lock
);
457 spin_unlock_bh(&queue
->lock
);
463 nfqnl_mangle(void *data
, int data_len
, struct nf_queue_entry
*e
)
465 struct sk_buff
*nskb
;
468 diff
= data_len
- e
->skb
->len
;
470 if (pskb_trim(e
->skb
, data_len
))
472 } else if (diff
> 0) {
473 if (data_len
> 0xFFFF)
475 if (diff
> skb_tailroom(e
->skb
)) {
476 nskb
= skb_copy_expand(e
->skb
, skb_headroom(e
->skb
),
479 printk(KERN_WARNING
"nf_queue: OOM "
480 "in mangle, dropping packet\n");
486 skb_put(e
->skb
, diff
);
488 if (!skb_make_writable(e
->skb
, data_len
))
490 skb_copy_to_linear_data(e
->skb
, data
, data_len
);
491 e
->skb
->ip_summed
= CHECKSUM_NONE
;
496 nfqnl_set_mode(struct nfqnl_instance
*queue
,
497 unsigned char mode
, unsigned int range
)
501 spin_lock_bh(&queue
->lock
);
503 case NFQNL_COPY_NONE
:
504 case NFQNL_COPY_META
:
505 queue
->copy_mode
= mode
;
506 queue
->copy_range
= 0;
509 case NFQNL_COPY_PACKET
:
510 queue
->copy_mode
= mode
;
511 /* we're using struct nlattr which has 16bit nla_len */
513 queue
->copy_range
= 0xffff;
515 queue
->copy_range
= range
;
522 spin_unlock_bh(&queue
->lock
);
528 dev_cmp(struct nf_queue_entry
*entry
, unsigned long ifindex
)
531 if (entry
->indev
->ifindex
== ifindex
)
534 if (entry
->outdev
->ifindex
== ifindex
)
536 #ifdef CONFIG_BRIDGE_NETFILTER
537 if (entry
->skb
->nf_bridge
) {
538 if (entry
->skb
->nf_bridge
->physindev
&&
539 entry
->skb
->nf_bridge
->physindev
->ifindex
== ifindex
)
541 if (entry
->skb
->nf_bridge
->physoutdev
&&
542 entry
->skb
->nf_bridge
->physoutdev
->ifindex
== ifindex
)
549 /* drop all packets with either indev or outdev == ifindex from all queue
552 nfqnl_dev_drop(int ifindex
)
558 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
559 struct hlist_node
*tmp
;
560 struct nfqnl_instance
*inst
;
561 struct hlist_head
*head
= &instance_table
[i
];
563 hlist_for_each_entry_rcu(inst
, tmp
, head
, hlist
)
564 nfqnl_flush(inst
, dev_cmp
, ifindex
);
570 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
573 nfqnl_rcv_dev_event(struct notifier_block
*this,
574 unsigned long event
, void *ptr
)
576 struct net_device
*dev
= ptr
;
578 if (!net_eq(dev_net(dev
), &init_net
))
581 /* Drop any packets associated with the downed device */
582 if (event
== NETDEV_DOWN
)
583 nfqnl_dev_drop(dev
->ifindex
);
587 static struct notifier_block nfqnl_dev_notifier
= {
588 .notifier_call
= nfqnl_rcv_dev_event
,
592 nfqnl_rcv_nl_event(struct notifier_block
*this,
593 unsigned long event
, void *ptr
)
595 struct netlink_notify
*n
= ptr
;
597 if (event
== NETLINK_URELEASE
&& n
->protocol
== NETLINK_NETFILTER
) {
600 /* destroy all instances for this pid */
601 spin_lock(&instances_lock
);
602 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
603 struct hlist_node
*tmp
, *t2
;
604 struct nfqnl_instance
*inst
;
605 struct hlist_head
*head
= &instance_table
[i
];
607 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
608 if ((n
->net
== &init_net
) &&
609 (n
->pid
== inst
->peer_pid
))
610 __instance_destroy(inst
);
613 spin_unlock(&instances_lock
);
618 static struct notifier_block nfqnl_rtnl_notifier
= {
619 .notifier_call
= nfqnl_rcv_nl_event
,
622 static const struct nla_policy nfqa_verdict_policy
[NFQA_MAX
+1] = {
623 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
624 [NFQA_MARK
] = { .type
= NLA_U32
},
625 [NFQA_PAYLOAD
] = { .type
= NLA_UNSPEC
},
628 static const struct nla_policy nfqa_verdict_batch_policy
[NFQA_MAX
+1] = {
629 [NFQA_VERDICT_HDR
] = { .len
= sizeof(struct nfqnl_msg_verdict_hdr
) },
630 [NFQA_MARK
] = { .type
= NLA_U32
},
633 static struct nfqnl_instance
*verdict_instance_lookup(u16 queue_num
, int nlpid
)
635 struct nfqnl_instance
*queue
;
637 queue
= instance_lookup(queue_num
);
639 return ERR_PTR(-ENODEV
);
641 if (queue
->peer_pid
!= nlpid
)
642 return ERR_PTR(-EPERM
);
647 static struct nfqnl_msg_verdict_hdr
*
648 verdicthdr_get(const struct nlattr
* const nfqa
[])
650 struct nfqnl_msg_verdict_hdr
*vhdr
;
651 unsigned int verdict
;
653 if (!nfqa
[NFQA_VERDICT_HDR
])
656 vhdr
= nla_data(nfqa
[NFQA_VERDICT_HDR
]);
657 verdict
= ntohl(vhdr
->verdict
) & NF_VERDICT_MASK
;
658 if (verdict
> NF_MAX_VERDICT
|| verdict
== NF_STOLEN
)
663 static int nfq_id_after(unsigned int id
, unsigned int max
)
665 return (int)(id
- max
) > 0;
669 nfqnl_recv_verdict_batch(struct sock
*ctnl
, struct sk_buff
*skb
,
670 const struct nlmsghdr
*nlh
,
671 const struct nlattr
* const nfqa
[])
673 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
674 struct nf_queue_entry
*entry
, *tmp
;
675 unsigned int verdict
, maxid
;
676 struct nfqnl_msg_verdict_hdr
*vhdr
;
677 struct nfqnl_instance
*queue
;
678 LIST_HEAD(batch_list
);
679 u16 queue_num
= ntohs(nfmsg
->res_id
);
681 queue
= verdict_instance_lookup(queue_num
, NETLINK_CB(skb
).pid
);
683 return PTR_ERR(queue
);
685 vhdr
= verdicthdr_get(nfqa
);
689 verdict
= ntohl(vhdr
->verdict
);
690 maxid
= ntohl(vhdr
->id
);
692 spin_lock_bh(&queue
->lock
);
694 list_for_each_entry_safe(entry
, tmp
, &queue
->queue_list
, list
) {
695 if (nfq_id_after(entry
->id
, maxid
))
697 __dequeue_entry(queue
, entry
);
698 list_add_tail(&entry
->list
, &batch_list
);
701 spin_unlock_bh(&queue
->lock
);
703 if (list_empty(&batch_list
))
706 list_for_each_entry_safe(entry
, tmp
, &batch_list
, list
) {
708 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
709 nf_reinject(entry
, verdict
);
715 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
716 const struct nlmsghdr
*nlh
,
717 const struct nlattr
* const nfqa
[])
719 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
720 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
722 struct nfqnl_msg_verdict_hdr
*vhdr
;
723 struct nfqnl_instance
*queue
;
724 unsigned int verdict
;
725 struct nf_queue_entry
*entry
;
727 queue
= instance_lookup(queue_num
);
730 queue
= verdict_instance_lookup(queue_num
, NETLINK_CB(skb
).pid
);
732 return PTR_ERR(queue
);
734 vhdr
= verdicthdr_get(nfqa
);
738 verdict
= ntohl(vhdr
->verdict
);
740 entry
= find_dequeue_entry(queue
, ntohl(vhdr
->id
));
744 if (nfqa
[NFQA_PAYLOAD
]) {
745 if (nfqnl_mangle(nla_data(nfqa
[NFQA_PAYLOAD
]),
746 nla_len(nfqa
[NFQA_PAYLOAD
]), entry
) < 0)
751 entry
->skb
->mark
= ntohl(nla_get_be32(nfqa
[NFQA_MARK
]));
753 nf_reinject(entry
, verdict
);
758 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
759 const struct nlmsghdr
*nlh
,
760 const struct nlattr
* const nfqa
[])
765 static const struct nla_policy nfqa_cfg_policy
[NFQA_CFG_MAX
+1] = {
766 [NFQA_CFG_CMD
] = { .len
= sizeof(struct nfqnl_msg_config_cmd
) },
767 [NFQA_CFG_PARAMS
] = { .len
= sizeof(struct nfqnl_msg_config_params
) },
770 static const struct nf_queue_handler nfqh
= {
772 .outfn
= &nfqnl_enqueue_packet
,
776 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
777 const struct nlmsghdr
*nlh
,
778 const struct nlattr
* const nfqa
[])
780 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
781 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
782 struct nfqnl_instance
*queue
;
783 struct nfqnl_msg_config_cmd
*cmd
= NULL
;
786 if (nfqa
[NFQA_CFG_CMD
]) {
787 cmd
= nla_data(nfqa
[NFQA_CFG_CMD
]);
789 /* Commands without queue context - might sleep */
790 switch (cmd
->command
) {
791 case NFQNL_CFG_CMD_PF_BIND
:
792 return nf_register_queue_handler(ntohs(cmd
->pf
),
794 case NFQNL_CFG_CMD_PF_UNBIND
:
795 return nf_unregister_queue_handler(ntohs(cmd
->pf
),
801 queue
= instance_lookup(queue_num
);
802 if (queue
&& queue
->peer_pid
!= NETLINK_CB(skb
).pid
) {
808 switch (cmd
->command
) {
809 case NFQNL_CFG_CMD_BIND
:
814 queue
= instance_create(queue_num
, NETLINK_CB(skb
).pid
);
816 ret
= PTR_ERR(queue
);
820 case NFQNL_CFG_CMD_UNBIND
:
825 instance_destroy(queue
);
827 case NFQNL_CFG_CMD_PF_BIND
:
828 case NFQNL_CFG_CMD_PF_UNBIND
:
836 if (nfqa
[NFQA_CFG_PARAMS
]) {
837 struct nfqnl_msg_config_params
*params
;
843 params
= nla_data(nfqa
[NFQA_CFG_PARAMS
]);
844 nfqnl_set_mode(queue
, params
->copy_mode
,
845 ntohl(params
->copy_range
));
848 if (nfqa
[NFQA_CFG_QUEUE_MAXLEN
]) {
849 __be32
*queue_maxlen
;
855 queue_maxlen
= nla_data(nfqa
[NFQA_CFG_QUEUE_MAXLEN
]);
856 spin_lock_bh(&queue
->lock
);
857 queue
->queue_maxlen
= ntohl(*queue_maxlen
);
858 spin_unlock_bh(&queue
->lock
);
866 static const struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
867 [NFQNL_MSG_PACKET
] = { .call_rcu
= nfqnl_recv_unsupp
,
868 .attr_count
= NFQA_MAX
, },
869 [NFQNL_MSG_VERDICT
] = { .call_rcu
= nfqnl_recv_verdict
,
870 .attr_count
= NFQA_MAX
,
871 .policy
= nfqa_verdict_policy
},
872 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
873 .attr_count
= NFQA_CFG_MAX
,
874 .policy
= nfqa_cfg_policy
},
875 [NFQNL_MSG_VERDICT_BATCH
]={ .call_rcu
= nfqnl_recv_verdict_batch
,
876 .attr_count
= NFQA_MAX
,
877 .policy
= nfqa_verdict_batch_policy
},
880 static const struct nfnetlink_subsystem nfqnl_subsys
= {
882 .subsys_id
= NFNL_SUBSYS_QUEUE
,
883 .cb_count
= NFQNL_MSG_MAX
,
887 #ifdef CONFIG_PROC_FS
892 static struct hlist_node
*get_first(struct seq_file
*seq
)
894 struct iter_state
*st
= seq
->private;
899 for (st
->bucket
= 0; st
->bucket
< INSTANCE_BUCKETS
; st
->bucket
++) {
900 if (!hlist_empty(&instance_table
[st
->bucket
]))
901 return instance_table
[st
->bucket
].first
;
906 static struct hlist_node
*get_next(struct seq_file
*seq
, struct hlist_node
*h
)
908 struct iter_state
*st
= seq
->private;
912 if (++st
->bucket
>= INSTANCE_BUCKETS
)
915 h
= instance_table
[st
->bucket
].first
;
920 static struct hlist_node
*get_idx(struct seq_file
*seq
, loff_t pos
)
922 struct hlist_node
*head
;
923 head
= get_first(seq
);
926 while (pos
&& (head
= get_next(seq
, head
)))
928 return pos
? NULL
: head
;
931 static void *seq_start(struct seq_file
*seq
, loff_t
*pos
)
932 __acquires(instances_lock
)
934 spin_lock(&instances_lock
);
935 return get_idx(seq
, *pos
);
938 static void *seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
941 return get_next(s
, v
);
944 static void seq_stop(struct seq_file
*s
, void *v
)
945 __releases(instances_lock
)
947 spin_unlock(&instances_lock
);
950 static int seq_show(struct seq_file
*s
, void *v
)
952 const struct nfqnl_instance
*inst
= v
;
954 return seq_printf(s
, "%5d %6d %5d %1d %5d %5d %5d %8d %2d\n",
956 inst
->peer_pid
, inst
->queue_total
,
957 inst
->copy_mode
, inst
->copy_range
,
958 inst
->queue_dropped
, inst
->queue_user_dropped
,
959 inst
->id_sequence
, 1);
962 static const struct seq_operations nfqnl_seq_ops
= {
969 static int nfqnl_open(struct inode
*inode
, struct file
*file
)
971 return seq_open_private(file
, &nfqnl_seq_ops
,
972 sizeof(struct iter_state
));
975 static const struct file_operations nfqnl_file_ops
= {
976 .owner
= THIS_MODULE
,
980 .release
= seq_release_private
,
985 static int __init
nfnetlink_queue_init(void)
987 int i
, status
= -ENOMEM
;
989 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++)
990 INIT_HLIST_HEAD(&instance_table
[i
]);
992 netlink_register_notifier(&nfqnl_rtnl_notifier
);
993 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
995 printk(KERN_ERR
"nf_queue: failed to create netlink socket\n");
996 goto cleanup_netlink_notifier
;
999 #ifdef CONFIG_PROC_FS
1000 if (!proc_create("nfnetlink_queue", 0440,
1001 proc_net_netfilter
, &nfqnl_file_ops
))
1002 goto cleanup_subsys
;
1005 register_netdevice_notifier(&nfqnl_dev_notifier
);
1008 #ifdef CONFIG_PROC_FS
1010 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1012 cleanup_netlink_notifier
:
1013 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1017 static void __exit
nfnetlink_queue_fini(void)
1019 nf_unregister_queue_handlers(&nfqh
);
1020 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
1021 #ifdef CONFIG_PROC_FS
1022 remove_proc_entry("nfnetlink_queue", proc_net_netfilter
);
1024 nfnetlink_subsys_unregister(&nfqnl_subsys
);
1025 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
1027 rcu_barrier(); /* Wait for completion of call_rcu()'s */
1030 MODULE_DESCRIPTION("netfilter packet queue handler");
1031 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
1032 MODULE_LICENSE("GPL");
1033 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);
1035 module_init(nfnetlink_queue_init
);
1036 module_exit(nfnetlink_queue_fini
);