2 * This is a module which is used for queueing packets and communicating with
3 * userspace via nfetlink.
5 * (C) 2005 by Harald Welte <laforge@netfilter.org>
7 * Based on the old ipv4-only ip_queue.c:
8 * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
9 * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/skbuff.h>
18 #include <linux/init.h>
19 #include <linux/spinlock.h>
20 #include <linux/notifier.h>
21 #include <linux/netdevice.h>
22 #include <linux/netfilter.h>
23 #include <linux/netfilter_ipv4.h>
24 #include <linux/netfilter_ipv6.h>
25 #include <linux/netfilter/nfnetlink.h>
26 #include <linux/netfilter/nfnetlink_queue.h>
27 #include <linux/list.h>
30 #include <asm/atomic.h>
32 #define NFQNL_QMAX_DEFAULT 1024
35 #define QDEBUG(x, args ...) printk(KERN_DEBUG "%s(%d):%s(): " x, \
36 __FILE__, __LINE__, __FUNCTION__, \
39 #define QDEBUG(x, ...)
42 struct nfqnl_queue_entry
{
43 struct list_head list
;
49 struct nfqnl_instance
{
50 struct hlist_node hlist
; /* global list of queues */
53 unsigned int queue_maxlen
;
54 unsigned int copy_range
;
55 unsigned int queue_total
;
56 unsigned int queue_dropped
;
57 unsigned int queue_user_dropped
;
59 atomic_t id_sequence
; /* 'sequence' of pkt ids */
61 u_int16_t queue_num
; /* number of this queue */
66 struct list_head queue_list
; /* packets in queue */
69 typedef int (*nfqnl_cmpfn
)(struct nfqnl_queue_entry
*, unsigned long);
71 static DEFINE_RWLOCK(instances_lock
);
73 u_int64_t
htonll(u_int64_t in
)
78 for (i
= 0; i
< sizeof(u_int64_t
); i
++)
79 ((u_int8_t
*)&out
)[sizeof(u_int64_t
)-1] = ((u_int8_t
*)&in
)[i
];
84 #define INSTANCE_BUCKETS 16
85 static struct hlist_head instance_table
[INSTANCE_BUCKETS
];
87 static inline u_int8_t
instance_hashfn(u_int16_t queue_num
)
89 return ((queue_num
>> 8) | queue_num
) % INSTANCE_BUCKETS
;
92 static struct nfqnl_instance
*
93 __instance_lookup(u_int16_t queue_num
)
95 struct hlist_head
*head
;
96 struct hlist_node
*pos
;
97 struct nfqnl_instance
*inst
;
99 head
= &instance_table
[instance_hashfn(queue_num
)];
100 hlist_for_each_entry(inst
, pos
, head
, hlist
) {
101 if (inst
->queue_num
== queue_num
)
107 static struct nfqnl_instance
*
108 instance_lookup(u_int16_t queue_num
)
110 struct nfqnl_instance
*inst
;
112 read_lock_bh(&instances_lock
);
113 inst
= __instance_lookup(queue_num
);
114 read_unlock_bh(&instances_lock
);
119 static struct nfqnl_instance
*
120 instance_create(u_int16_t queue_num
, int pid
)
122 struct nfqnl_instance
*inst
;
124 QDEBUG("entering for queue_num=%u, pid=%d\n", queue_num
, pid
);
126 write_lock_bh(&instances_lock
);
127 if (__instance_lookup(queue_num
)) {
129 QDEBUG("aborting, instance already exists\n");
133 inst
= kmalloc(sizeof(*inst
), GFP_ATOMIC
);
137 memset(inst
, 0, sizeof(*inst
));
138 inst
->queue_num
= queue_num
;
139 inst
->peer_pid
= pid
;
140 inst
->queue_maxlen
= NFQNL_QMAX_DEFAULT
;
141 inst
->copy_range
= 0xfffff;
142 inst
->copy_mode
= NFQNL_COPY_NONE
;
143 atomic_set(&inst
->id_sequence
, 0);
144 inst
->lock
= SPIN_LOCK_UNLOCKED
;
145 INIT_LIST_HEAD(&inst
->queue_list
);
147 if (!try_module_get(THIS_MODULE
))
150 hlist_add_head(&inst
->hlist
,
151 &instance_table
[instance_hashfn(queue_num
)]);
153 write_unlock_bh(&instances_lock
);
155 QDEBUG("successfully created new instance\n");
162 write_unlock_bh(&instances_lock
);
166 static void nfqnl_flush(struct nfqnl_instance
*queue
, int verdict
);
169 _instance_destroy2(struct nfqnl_instance
*inst
, int lock
)
171 /* first pull it out of the global list */
173 write_lock_bh(&instances_lock
);
175 QDEBUG("removing instance %p (queuenum=%u) from hash\n",
176 inst
, inst
->queue_num
);
177 hlist_del(&inst
->hlist
);
180 write_unlock_bh(&instances_lock
);
182 /* then flush all pending skbs from the queue */
183 nfqnl_flush(inst
, NF_DROP
);
185 /* and finally free the data structure */
188 module_put(THIS_MODULE
);
192 __instance_destroy(struct nfqnl_instance
*inst
)
194 _instance_destroy2(inst
, 0);
198 instance_destroy(struct nfqnl_instance
*inst
)
200 _instance_destroy2(inst
, 1);
206 issue_verdict(struct nfqnl_queue_entry
*entry
, int verdict
)
208 QDEBUG("entering for entry %p, verdict %u\n", entry
, verdict
);
210 /* TCP input path (and probably other bits) assume to be called
211 * from softirq context, not from syscall, like issue_verdict is
212 * called. TCP input path deadlocks with locks taken from timer
213 * softirq, e.g. We therefore emulate this by local_bh_disable() */
216 nf_reinject(entry
->skb
, entry
->info
, verdict
);
223 __enqueue_entry(struct nfqnl_instance
*queue
,
224 struct nfqnl_queue_entry
*entry
)
226 list_add(&entry
->list
, &queue
->queue_list
);
227 queue
->queue_total
++;
231 * Find and return a queued entry matched by cmpfn, or return the last
232 * entry if cmpfn is NULL.
234 static inline struct nfqnl_queue_entry
*
235 __find_entry(struct nfqnl_instance
*queue
, nfqnl_cmpfn cmpfn
,
240 list_for_each_prev(p
, &queue
->queue_list
) {
241 struct nfqnl_queue_entry
*entry
= (struct nfqnl_queue_entry
*)p
;
243 if (!cmpfn
|| cmpfn(entry
, data
))
250 __dequeue_entry(struct nfqnl_instance
*q
, struct nfqnl_queue_entry
*entry
)
252 list_del(&entry
->list
);
256 static inline struct nfqnl_queue_entry
*
257 __find_dequeue_entry(struct nfqnl_instance
*queue
,
258 nfqnl_cmpfn cmpfn
, unsigned long data
)
260 struct nfqnl_queue_entry
*entry
;
262 entry
= __find_entry(queue
, cmpfn
, data
);
266 __dequeue_entry(queue
, entry
);
272 __nfqnl_flush(struct nfqnl_instance
*queue
, int verdict
)
274 struct nfqnl_queue_entry
*entry
;
276 while ((entry
= __find_dequeue_entry(queue
, NULL
, 0)))
277 issue_verdict(entry
, verdict
);
281 __nfqnl_set_mode(struct nfqnl_instance
*queue
,
282 unsigned char mode
, unsigned int range
)
287 case NFQNL_COPY_NONE
:
288 case NFQNL_COPY_META
:
289 queue
->copy_mode
= mode
;
290 queue
->copy_range
= 0;
293 case NFQNL_COPY_PACKET
:
294 queue
->copy_mode
= mode
;
295 /* we're using struct nfattr which has 16bit nfa_len */
297 queue
->copy_range
= 0xffff;
299 queue
->copy_range
= range
;
309 static struct nfqnl_queue_entry
*
310 find_dequeue_entry(struct nfqnl_instance
*queue
,
311 nfqnl_cmpfn cmpfn
, unsigned long data
)
313 struct nfqnl_queue_entry
*entry
;
315 spin_lock_bh(&queue
->lock
);
316 entry
= __find_dequeue_entry(queue
, cmpfn
, data
);
317 spin_unlock_bh(&queue
->lock
);
323 nfqnl_flush(struct nfqnl_instance
*queue
, int verdict
)
325 spin_lock_bh(&queue
->lock
);
326 __nfqnl_flush(queue
, verdict
);
327 spin_unlock_bh(&queue
->lock
);
330 static struct sk_buff
*
331 nfqnl_build_packet_message(struct nfqnl_instance
*queue
,
332 struct nfqnl_queue_entry
*entry
, int *errp
)
334 unsigned char *old_tail
;
338 struct nfqnl_msg_packet_hdr pmsg
;
339 struct nlmsghdr
*nlh
;
340 struct nfgenmsg
*nfmsg
;
341 unsigned int tmp_uint
;
345 /* all macros expand to constant values at compile time */
346 size
= NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hdr
))
347 + NLMSG_SPACE(sizeof(u_int32_t
)) /* ifindex */
348 + NLMSG_SPACE(sizeof(u_int32_t
)) /* ifindex */
349 + NLMSG_SPACE(sizeof(u_int32_t
)) /* mark */
350 + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_hw
))
351 + NLMSG_SPACE(sizeof(struct nfqnl_msg_packet_timestamp
));
353 spin_lock_bh(&queue
->lock
);
355 switch (queue
->copy_mode
) {
356 case NFQNL_COPY_META
:
357 case NFQNL_COPY_NONE
:
361 case NFQNL_COPY_PACKET
:
362 if (queue
->copy_range
== 0
363 || queue
->copy_range
> entry
->skb
->len
)
364 data_len
= entry
->skb
->len
;
366 data_len
= queue
->copy_range
;
368 size
+= NLMSG_SPACE(data_len
);
373 spin_unlock_bh(&queue
->lock
);
377 spin_unlock_bh(&queue
->lock
);
379 skb
= alloc_skb(size
, GFP_ATOMIC
);
384 nlh
= NLMSG_PUT(skb
, 0, 0,
385 NFNL_SUBSYS_QUEUE
<< 8 | NFQNL_MSG_PACKET
,
386 sizeof(struct nfgenmsg
));
387 nfmsg
= NLMSG_DATA(nlh
);
388 nfmsg
->nfgen_family
= entry
->info
->pf
;
389 nfmsg
->version
= NFNETLINK_V0
;
390 nfmsg
->res_id
= htons(queue
->queue_num
);
392 pmsg
.packet_id
= htonl(entry
->id
);
393 pmsg
.hw_protocol
= htons(entry
->skb
->protocol
);
394 pmsg
.hook
= entry
->info
->hook
;
396 NFA_PUT(skb
, NFQA_PACKET_HDR
, sizeof(pmsg
), &pmsg
);
398 if (entry
->info
->indev
) {
399 tmp_uint
= htonl(entry
->info
->indev
->ifindex
);
400 NFA_PUT(skb
, NFQA_IFINDEX_INDEV
, sizeof(tmp_uint
), &tmp_uint
);
403 if (entry
->info
->outdev
) {
404 tmp_uint
= htonl(entry
->info
->outdev
->ifindex
);
405 NFA_PUT(skb
, NFQA_IFINDEX_OUTDEV
, sizeof(tmp_uint
), &tmp_uint
);
408 if (entry
->skb
->nfmark
) {
409 tmp_uint
= htonl(entry
->skb
->nfmark
);
410 NFA_PUT(skb
, NFQA_MARK
, sizeof(u_int32_t
), &tmp_uint
);
413 if (entry
->info
->indev
&& entry
->skb
->dev
414 && entry
->skb
->dev
->hard_header_parse
) {
415 struct nfqnl_msg_packet_hw phw
;
418 entry
->skb
->dev
->hard_header_parse(entry
->skb
,
420 phw
.hw_addrlen
= htons(phw
.hw_addrlen
);
421 NFA_PUT(skb
, NFQA_HWADDR
, sizeof(phw
), &phw
);
424 if (entry
->skb
->stamp
.tv_sec
) {
425 struct nfqnl_msg_packet_timestamp ts
;
427 ts
.sec
= htonll(entry
->skb
->stamp
.tv_sec
);
428 ts
.usec
= htonll(entry
->skb
->stamp
.tv_usec
);
430 NFA_PUT(skb
, NFQA_TIMESTAMP
, sizeof(ts
), &ts
);
435 int size
= NFA_LENGTH(data_len
);
437 if (skb_tailroom(skb
) < (int)NFA_SPACE(data_len
)) {
438 printk(KERN_WARNING
"nf_queue: no tailroom!\n");
442 nfa
= (struct nfattr
*)skb_put(skb
, NFA_ALIGN(size
));
443 nfa
->nfa_type
= NFQA_PAYLOAD
;
446 if (skb_copy_bits(entry
->skb
, 0, NFA_DATA(nfa
), data_len
))
450 nlh
->nlmsg_len
= skb
->tail
- old_tail
;
459 printk(KERN_ERR
"nf_queue: error creating packet message\n");
464 nfqnl_enqueue_packet(struct sk_buff
*skb
, struct nf_info
*info
,
465 unsigned int queuenum
, void *data
)
467 int status
= -EINVAL
;
468 struct sk_buff
*nskb
;
469 struct nfqnl_instance
*queue
;
470 struct nfqnl_queue_entry
*entry
;
474 queue
= instance_lookup(queuenum
);
476 QDEBUG("no queue instance matching\n");
480 if (queue
->copy_mode
== NFQNL_COPY_NONE
) {
481 QDEBUG("mode COPY_NONE, aborting\n");
485 entry
= kmalloc(sizeof(*entry
), GFP_ATOMIC
);
489 "nf_queue: OOM in nfqnl_enqueue_packet()\n");
495 entry
->id
= atomic_inc_return(&queue
->id_sequence
);
497 nskb
= nfqnl_build_packet_message(queue
, entry
, &status
);
501 spin_lock_bh(&queue
->lock
);
503 if (!queue
->peer_pid
)
504 goto err_out_free_nskb
;
506 if (queue
->queue_total
>= queue
->queue_maxlen
) {
507 queue
->queue_dropped
++;
510 printk(KERN_WARNING
"ip_queue: full at %d entries, "
511 "dropping packets(s). Dropped: %d\n",
512 queue
->queue_total
, queue
->queue_dropped
);
513 goto err_out_free_nskb
;
516 /* nfnetlink_unicast will either free the nskb or add it to a socket */
517 status
= nfnetlink_unicast(nskb
, queue
->peer_pid
, MSG_DONTWAIT
);
519 queue
->queue_user_dropped
++;
523 __enqueue_entry(queue
, entry
);
525 spin_unlock_bh(&queue
->lock
);
532 spin_unlock_bh(&queue
->lock
);
540 nfqnl_mangle(void *data
, int data_len
, struct nfqnl_queue_entry
*e
)
544 diff
= data_len
- e
->skb
->len
;
546 skb_trim(e
->skb
, data_len
);
548 if (data_len
> 0xFFFF)
550 if (diff
> skb_tailroom(e
->skb
)) {
551 struct sk_buff
*newskb
;
553 newskb
= skb_copy_expand(e
->skb
,
554 skb_headroom(e
->skb
),
557 if (newskb
== NULL
) {
558 printk(KERN_WARNING
"ip_queue: OOM "
559 "in mangle, dropping packet\n");
563 skb_set_owner_w(newskb
, e
->skb
->sk
);
567 skb_put(e
->skb
, diff
);
569 if (!skb_make_writable(&e
->skb
, data_len
))
571 memcpy(e
->skb
->data
, data
, data_len
);
577 id_cmp(struct nfqnl_queue_entry
*e
, unsigned long id
)
579 return (id
== e
->id
);
583 nfqnl_set_mode(struct nfqnl_instance
*queue
,
584 unsigned char mode
, unsigned int range
)
588 spin_lock_bh(&queue
->lock
);
589 status
= __nfqnl_set_mode(queue
, mode
, range
);
590 spin_unlock_bh(&queue
->lock
);
596 dev_cmp(struct nfqnl_queue_entry
*entry
, unsigned long ifindex
)
598 if (entry
->info
->indev
)
599 if (entry
->info
->indev
->ifindex
== ifindex
)
602 if (entry
->info
->outdev
)
603 if (entry
->info
->outdev
->ifindex
== ifindex
)
609 /* drop all packets with either indev or outdev == ifindex from all queue
612 nfqnl_dev_drop(int ifindex
)
616 QDEBUG("entering for ifindex %u\n", ifindex
);
618 /* this only looks like we have to hold the readlock for a way too long
619 * time, issue_verdict(), nf_reinject(), ... - but we always only
620 * issue NF_DROP, which is processed directly in nf_reinject() */
621 read_lock_bh(&instances_lock
);
623 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
624 struct hlist_node
*tmp
;
625 struct nfqnl_instance
*inst
;
626 struct hlist_head
*head
= &instance_table
[i
];
628 hlist_for_each_entry(inst
, tmp
, head
, hlist
) {
629 struct nfqnl_queue_entry
*entry
;
630 while ((entry
= find_dequeue_entry(inst
, dev_cmp
,
632 issue_verdict(entry
, NF_DROP
);
636 read_unlock_bh(&instances_lock
);
639 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
642 nfqnl_rcv_dev_event(struct notifier_block
*this,
643 unsigned long event
, void *ptr
)
645 struct net_device
*dev
= ptr
;
647 /* Drop any packets associated with the downed device */
648 if (event
== NETDEV_DOWN
)
649 nfqnl_dev_drop(dev
->ifindex
);
653 static struct notifier_block nfqnl_dev_notifier
= {
654 .notifier_call
= nfqnl_rcv_dev_event
,
658 nfqnl_rcv_nl_event(struct notifier_block
*this,
659 unsigned long event
, void *ptr
)
661 struct netlink_notify
*n
= ptr
;
663 if (event
== NETLINK_URELEASE
&&
664 n
->protocol
== NETLINK_NETFILTER
&& n
->pid
) {
667 /* destroy all instances for this pid */
668 write_lock_bh(&instances_lock
);
669 for (i
= 0; i
< INSTANCE_BUCKETS
; i
++) {
670 struct hlist_node
*tmp
, *t2
;
671 struct nfqnl_instance
*inst
;
672 struct hlist_head
*head
= &instance_table
[i
];
674 hlist_for_each_entry_safe(inst
, tmp
, t2
, head
, hlist
) {
675 if (n
->pid
== inst
->peer_pid
)
676 __instance_destroy(inst
);
679 write_unlock_bh(&instances_lock
);
684 static struct notifier_block nfqnl_rtnl_notifier
= {
685 .notifier_call
= nfqnl_rcv_nl_event
,
689 nfqnl_recv_verdict(struct sock
*ctnl
, struct sk_buff
*skb
,
690 struct nlmsghdr
*nlh
, struct nfattr
*nfqa
[], int *errp
)
692 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
693 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
695 struct nfqnl_msg_verdict_hdr
*vhdr
;
696 struct nfqnl_instance
*queue
;
697 unsigned int verdict
;
698 struct nfqnl_queue_entry
*entry
;
700 queue
= instance_lookup(queue_num
);
704 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
)
707 if (!nfqa
[NFQA_VERDICT_HDR
-1])
710 vhdr
= NFA_DATA(nfqa
[NFQA_VERDICT_HDR
-1]);
711 verdict
= ntohl(vhdr
->verdict
);
713 if ((verdict
& NF_VERDICT_MASK
) > NF_MAX_VERDICT
)
716 entry
= find_dequeue_entry(queue
, id_cmp
, ntohl(vhdr
->id
));
720 if (nfqa
[NFQA_PAYLOAD
-1]) {
721 if (nfqnl_mangle(NFA_DATA(nfqa
[NFQA_PAYLOAD
-1]),
722 NFA_PAYLOAD(nfqa
[NFQA_PAYLOAD
-1]), entry
) < 0)
726 if (nfqa
[NFQA_MARK
-1])
727 skb
->nfmark
= ntohl(*(u_int32_t
*)NFA_DATA(nfqa
[NFQA_MARK
-1]));
729 issue_verdict(entry
, verdict
);
734 nfqnl_recv_unsupp(struct sock
*ctnl
, struct sk_buff
*skb
,
735 struct nlmsghdr
*nlh
, struct nfattr
*nfqa
[], int *errp
)
741 nfqnl_recv_config(struct sock
*ctnl
, struct sk_buff
*skb
,
742 struct nlmsghdr
*nlh
, struct nfattr
*nfqa
[], int *errp
)
744 struct nfgenmsg
*nfmsg
= NLMSG_DATA(nlh
);
745 u_int16_t queue_num
= ntohs(nfmsg
->res_id
);
746 struct nfqnl_instance
*queue
;
748 QDEBUG("entering for msg %u\n", NFNL_MSG_TYPE(nlh
->nlmsg_type
));
750 queue
= instance_lookup(queue_num
);
751 if (nfqa
[NFQA_CFG_CMD
-1]) {
752 struct nfqnl_msg_config_cmd
*cmd
;
753 cmd
= NFA_DATA(nfqa
[NFQA_CFG_CMD
-1]);
754 QDEBUG("found CFG_CMD\n");
756 switch (cmd
->command
) {
757 case NFQNL_CFG_CMD_BIND
:
761 queue
= instance_create(queue_num
, NETLINK_CB(skb
).pid
);
765 case NFQNL_CFG_CMD_UNBIND
:
769 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
)
772 instance_destroy(queue
);
774 case NFQNL_CFG_CMD_PF_BIND
:
775 QDEBUG("registering queue handler for pf=%u\n",
777 return nf_register_queue_handler(ntohs(cmd
->pf
),
778 nfqnl_enqueue_packet
,
782 case NFQNL_CFG_CMD_PF_UNBIND
:
783 QDEBUG("unregistering queue handler for pf=%u\n",
785 /* This is a bug and a feature. We can unregister
786 * other handlers(!) */
787 return nf_unregister_queue_handler(ntohs(cmd
->pf
));
794 QDEBUG("no config command, and no instance ENOENT\n");
798 if (queue
->peer_pid
!= NETLINK_CB(skb
).pid
) {
799 QDEBUG("no config command, and wrong pid\n");
804 if (nfqa
[NFQA_CFG_PARAMS
-1]) {
805 struct nfqnl_msg_config_params
*params
;
806 params
= NFA_DATA(nfqa
[NFQA_CFG_PARAMS
-1]);
808 nfqnl_set_mode(queue
, params
->copy_mode
,
809 ntohl(params
->copy_range
));
815 static struct nfnl_callback nfqnl_cb
[NFQNL_MSG_MAX
] = {
816 [NFQNL_MSG_PACKET
] = { .call
= nfqnl_recv_unsupp
,
817 .cap_required
= CAP_NET_ADMIN
},
818 [NFQNL_MSG_VERDICT
] = { .call
= nfqnl_recv_verdict
,
819 .cap_required
= CAP_NET_ADMIN
},
820 [NFQNL_MSG_CONFIG
] = { .call
= nfqnl_recv_config
,
821 .cap_required
= CAP_NET_ADMIN
},
824 static struct nfnetlink_subsystem nfqnl_subsys
= {
826 .subsys_id
= NFNL_SUBSYS_QUEUE
,
827 .cb_count
= NFQNL_MSG_MAX
,
828 .attr_count
= NFQA_MAX
,
833 init_or_cleanup(int init
)
835 int status
= -ENOMEM
;
840 netlink_register_notifier(&nfqnl_rtnl_notifier
);
841 status
= nfnetlink_subsys_register(&nfqnl_subsys
);
843 printk(KERN_ERR
"nf_queue: failed to create netlink socket\n");
844 goto cleanup_netlink_notifier
;
847 register_netdevice_notifier(&nfqnl_dev_notifier
);
851 nf_unregister_queue_handlers(nfqnl_enqueue_packet
);
852 unregister_netdevice_notifier(&nfqnl_dev_notifier
);
853 nfnetlink_subsys_unregister(&nfqnl_subsys
);
855 cleanup_netlink_notifier
:
856 netlink_unregister_notifier(&nfqnl_rtnl_notifier
);
860 static int __init
init(void)
863 return init_or_cleanup(1);
866 static void __exit
fini(void)
871 MODULE_DESCRIPTION("netfilter packet queue handler");
872 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
873 MODULE_LICENSE("GPL");
874 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_QUEUE
);