[NET]: convert network timestamps to ktime_t
[linux-2.6.git] / net / ipv4 / netfilter / ip_queue.c
1 /*
2  * This is a module which is used for queueing IPv4 packets and
3  * communicating with userspace via netlink.
4  *
5  * (C) 2000-2002 James Morris <jmorris@intercode.com.au>
6  * (C) 2003-2005 Netfilter Core Team <coreteam@netfilter.org>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * 2000-03-27: Simplified code (thanks to Andi Kleen for clues).
13  * 2000-05-20: Fixed notifier problems (following Miguel Freitas' report).
14  * 2000-06-19: Fixed so nfmark is copied to metadata (reported by Sebastian
15  *             Zander).
16  * 2000-08-01: Added Nick Williams' MAC support.
17  * 2002-06-25: Code cleanup.
18  * 2005-01-10: Added /proc counter for dropped packets; fixed so
19  *             packets aren't delivered to user space if they're going
20  *             to be dropped.
21  * 2005-05-26: local_bh_{disable,enable} around nf_reinject (Harald Welte)
22  *
23  */
24 #include <linux/module.h>
25 #include <linux/skbuff.h>
26 #include <linux/init.h>
27 #include <linux/ip.h>
28 #include <linux/notifier.h>
29 #include <linux/netdevice.h>
30 #include <linux/netfilter.h>
31 #include <linux/netfilter_ipv4/ip_queue.h>
32 #include <linux/netfilter_ipv4/ip_tables.h>
33 #include <linux/netlink.h>
34 #include <linux/spinlock.h>
35 #include <linux/sysctl.h>
36 #include <linux/proc_fs.h>
37 #include <linux/security.h>
38 #include <linux/mutex.h>
39 #include <net/sock.h>
40 #include <net/route.h>
41
42 #define IPQ_QMAX_DEFAULT 1024
43 #define IPQ_PROC_FS_NAME "ip_queue"
44 #define NET_IPQ_QMAX 2088
45 #define NET_IPQ_QMAX_NAME "ip_queue_maxlen"
46
47 struct ipq_queue_entry {
48         struct list_head list;
49         struct nf_info *info;
50         struct sk_buff *skb;
51 };
52
53 typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);
54
55 static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
56 static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
57 static DEFINE_RWLOCK(queue_lock);
58 static int peer_pid __read_mostly;
59 static unsigned int copy_range __read_mostly;
60 static unsigned int queue_total;
61 static unsigned int queue_dropped = 0;
62 static unsigned int queue_user_dropped = 0;
63 static struct sock *ipqnl __read_mostly;
64 static LIST_HEAD(queue_list);
65 static DEFINE_MUTEX(ipqnl_mutex);
66
67 static void
68 ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
69 {
70         /* TCP input path (and probably other bits) assume to be called
71          * from softirq context, not from syscall, like ipq_issue_verdict is
72          * called.  TCP input path deadlocks with locks taken from timer
73          * softirq, e.g.  We therefore emulate this by local_bh_disable() */
74
75         local_bh_disable();
76         nf_reinject(entry->skb, entry->info, verdict);
77         local_bh_enable();
78
79         kfree(entry);
80 }
81
82 static inline void
83 __ipq_enqueue_entry(struct ipq_queue_entry *entry)
84 {
85        list_add(&entry->list, &queue_list);
86        queue_total++;
87 }
88
89 /*
90  * Find and return a queued entry matched by cmpfn, or return the last
91  * entry if cmpfn is NULL.
92  */
93 static inline struct ipq_queue_entry *
94 __ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
95 {
96         struct list_head *p;
97
98         list_for_each_prev(p, &queue_list) {
99                 struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;
100
101                 if (!cmpfn || cmpfn(entry, data))
102                         return entry;
103         }
104         return NULL;
105 }
106
107 static inline void
108 __ipq_dequeue_entry(struct ipq_queue_entry *entry)
109 {
110         list_del(&entry->list);
111         queue_total--;
112 }
113
114 static inline struct ipq_queue_entry *
115 __ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
116 {
117         struct ipq_queue_entry *entry;
118
119         entry = __ipq_find_entry(cmpfn, data);
120         if (entry == NULL)
121                 return NULL;
122
123         __ipq_dequeue_entry(entry);
124         return entry;
125 }
126
127
128 static inline void
129 __ipq_flush(int verdict)
130 {
131         struct ipq_queue_entry *entry;
132
133         while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
134                 ipq_issue_verdict(entry, verdict);
135 }
136
137 static inline int
138 __ipq_set_mode(unsigned char mode, unsigned int range)
139 {
140         int status = 0;
141
142         switch(mode) {
143         case IPQ_COPY_NONE:
144         case IPQ_COPY_META:
145                 copy_mode = mode;
146                 copy_range = 0;
147                 break;
148
149         case IPQ_COPY_PACKET:
150                 copy_mode = mode;
151                 copy_range = range;
152                 if (copy_range > 0xFFFF)
153                         copy_range = 0xFFFF;
154                 break;
155
156         default:
157                 status = -EINVAL;
158
159         }
160         return status;
161 }
162
163 static inline void
164 __ipq_reset(void)
165 {
166         peer_pid = 0;
167         net_disable_timestamp();
168         __ipq_set_mode(IPQ_COPY_NONE, 0);
169         __ipq_flush(NF_DROP);
170 }
171
172 static struct ipq_queue_entry *
173 ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
174 {
175         struct ipq_queue_entry *entry;
176
177         write_lock_bh(&queue_lock);
178         entry = __ipq_find_dequeue_entry(cmpfn, data);
179         write_unlock_bh(&queue_lock);
180         return entry;
181 }
182
183 static void
184 ipq_flush(int verdict)
185 {
186         write_lock_bh(&queue_lock);
187         __ipq_flush(verdict);
188         write_unlock_bh(&queue_lock);
189 }
190
191 static struct sk_buff *
192 ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
193 {
194         unsigned char *old_tail;
195         size_t size = 0;
196         size_t data_len = 0;
197         struct sk_buff *skb;
198         struct ipq_packet_msg *pmsg;
199         struct nlmsghdr *nlh;
200         struct timeval tv;
201
202         read_lock_bh(&queue_lock);
203
204         switch (copy_mode) {
205         case IPQ_COPY_META:
206         case IPQ_COPY_NONE:
207                 size = NLMSG_SPACE(sizeof(*pmsg));
208                 data_len = 0;
209                 break;
210
211         case IPQ_COPY_PACKET:
212                 if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
213                      entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
214                     (*errp = skb_checksum_help(entry->skb))) {
215                         read_unlock_bh(&queue_lock);
216                         return NULL;
217                 }
218                 if (copy_range == 0 || copy_range > entry->skb->len)
219                         data_len = entry->skb->len;
220                 else
221                         data_len = copy_range;
222
223                 size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
224                 break;
225
226         default:
227                 *errp = -EINVAL;
228                 read_unlock_bh(&queue_lock);
229                 return NULL;
230         }
231
232         read_unlock_bh(&queue_lock);
233
234         skb = alloc_skb(size, GFP_ATOMIC);
235         if (!skb)
236                 goto nlmsg_failure;
237
238         old_tail= skb->tail;
239         nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
240         pmsg = NLMSG_DATA(nlh);
241         memset(pmsg, 0, sizeof(*pmsg));
242
243         pmsg->packet_id       = (unsigned long )entry;
244         pmsg->data_len        = data_len;
245         tv = ktime_to_timeval(entry->skb->tstamp);
246         pmsg->timestamp_sec   = tv.tv_sec;
247         pmsg->timestamp_usec  = tv.tv_usec;
248         pmsg->mark            = entry->skb->mark;
249         pmsg->hook            = entry->info->hook;
250         pmsg->hw_protocol     = entry->skb->protocol;
251
252         if (entry->info->indev)
253                 strcpy(pmsg->indev_name, entry->info->indev->name);
254         else
255                 pmsg->indev_name[0] = '\0';
256
257         if (entry->info->outdev)
258                 strcpy(pmsg->outdev_name, entry->info->outdev->name);
259         else
260                 pmsg->outdev_name[0] = '\0';
261
262         if (entry->info->indev && entry->skb->dev) {
263                 pmsg->hw_type = entry->skb->dev->type;
264                 if (entry->skb->dev->hard_header_parse)
265                         pmsg->hw_addrlen =
266                                 entry->skb->dev->hard_header_parse(entry->skb,
267                                                                    pmsg->hw_addr);
268         }
269
270         if (data_len)
271                 if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
272                         BUG();
273
274         nlh->nlmsg_len = skb->tail - old_tail;
275         return skb;
276
277 nlmsg_failure:
278         if (skb)
279                 kfree_skb(skb);
280         *errp = -EINVAL;
281         printk(KERN_ERR "ip_queue: error creating packet message\n");
282         return NULL;
283 }
284
285 static int
286 ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
287                    unsigned int queuenum, void *data)
288 {
289         int status = -EINVAL;
290         struct sk_buff *nskb;
291         struct ipq_queue_entry *entry;
292
293         if (copy_mode == IPQ_COPY_NONE)
294                 return -EAGAIN;
295
296         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
297         if (entry == NULL) {
298                 printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n");
299                 return -ENOMEM;
300         }
301
302         entry->info = info;
303         entry->skb = skb;
304
305         nskb = ipq_build_packet_message(entry, &status);
306         if (nskb == NULL)
307                 goto err_out_free;
308
309         write_lock_bh(&queue_lock);
310
311         if (!peer_pid)
312                 goto err_out_free_nskb;
313
314         if (queue_total >= queue_maxlen) {
315                 queue_dropped++;
316                 status = -ENOSPC;
317                 if (net_ratelimit())
318                           printk (KERN_WARNING "ip_queue: full at %d entries, "
319                                   "dropping packets(s). Dropped: %d\n", queue_total,
320                                   queue_dropped);
321                 goto err_out_free_nskb;
322         }
323
324         /* netlink_unicast will either free the nskb or attach it to a socket */
325         status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
326         if (status < 0) {
327                 queue_user_dropped++;
328                 goto err_out_unlock;
329         }
330
331         __ipq_enqueue_entry(entry);
332
333         write_unlock_bh(&queue_lock);
334         return status;
335
336 err_out_free_nskb:
337         kfree_skb(nskb);
338
339 err_out_unlock:
340         write_unlock_bh(&queue_lock);
341
342 err_out_free:
343         kfree(entry);
344         return status;
345 }
346
347 static int
348 ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
349 {
350         int diff;
351         struct iphdr *user_iph = (struct iphdr *)v->payload;
352
353         if (v->data_len < sizeof(*user_iph))
354                 return 0;
355         diff = v->data_len - e->skb->len;
356         if (diff < 0) {
357                 if (pskb_trim(e->skb, v->data_len))
358                         return -ENOMEM;
359         } else if (diff > 0) {
360                 if (v->data_len > 0xFFFF)
361                         return -EINVAL;
362                 if (diff > skb_tailroom(e->skb)) {
363                         struct sk_buff *newskb;
364
365                         newskb = skb_copy_expand(e->skb,
366                                                  skb_headroom(e->skb),
367                                                  diff,
368                                                  GFP_ATOMIC);
369                         if (newskb == NULL) {
370                                 printk(KERN_WARNING "ip_queue: OOM "
371                                       "in mangle, dropping packet\n");
372                                 return -ENOMEM;
373                         }
374                         if (e->skb->sk)
375                                 skb_set_owner_w(newskb, e->skb->sk);
376                         kfree_skb(e->skb);
377                         e->skb = newskb;
378                 }
379                 skb_put(e->skb, diff);
380         }
381         if (!skb_make_writable(&e->skb, v->data_len))
382                 return -ENOMEM;
383         memcpy(e->skb->data, v->payload, v->data_len);
384         e->skb->ip_summed = CHECKSUM_NONE;
385
386         return 0;
387 }
388
389 static inline int
390 id_cmp(struct ipq_queue_entry *e, unsigned long id)
391 {
392         return (id == (unsigned long )e);
393 }
394
395 static int
396 ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
397 {
398         struct ipq_queue_entry *entry;
399
400         if (vmsg->value > NF_MAX_VERDICT)
401                 return -EINVAL;
402
403         entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
404         if (entry == NULL)
405                 return -ENOENT;
406         else {
407                 int verdict = vmsg->value;
408
409                 if (vmsg->data_len && vmsg->data_len == len)
410                         if (ipq_mangle_ipv4(vmsg, entry) < 0)
411                                 verdict = NF_DROP;
412
413                 ipq_issue_verdict(entry, verdict);
414                 return 0;
415         }
416 }
417
418 static int
419 ipq_set_mode(unsigned char mode, unsigned int range)
420 {
421         int status;
422
423         write_lock_bh(&queue_lock);
424         status = __ipq_set_mode(mode, range);
425         write_unlock_bh(&queue_lock);
426         return status;
427 }
428
429 static int
430 ipq_receive_peer(struct ipq_peer_msg *pmsg,
431                  unsigned char type, unsigned int len)
432 {
433         int status = 0;
434
435         if (len < sizeof(*pmsg))
436                 return -EINVAL;
437
438         switch (type) {
439         case IPQM_MODE:
440                 status = ipq_set_mode(pmsg->msg.mode.value,
441                                       pmsg->msg.mode.range);
442                 break;
443
444         case IPQM_VERDICT:
445                 if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
446                         status = -EINVAL;
447                 else
448                         status = ipq_set_verdict(&pmsg->msg.verdict,
449                                                  len - sizeof(*pmsg));
450                         break;
451         default:
452                 status = -EINVAL;
453         }
454         return status;
455 }
456
457 static int
458 dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
459 {
460         if (entry->info->indev)
461                 if (entry->info->indev->ifindex == ifindex)
462                         return 1;
463         if (entry->info->outdev)
464                 if (entry->info->outdev->ifindex == ifindex)
465                         return 1;
466 #ifdef CONFIG_BRIDGE_NETFILTER
467         if (entry->skb->nf_bridge) {
468                 if (entry->skb->nf_bridge->physindev &&
469                     entry->skb->nf_bridge->physindev->ifindex == ifindex)
470                         return 1;
471                 if (entry->skb->nf_bridge->physoutdev &&
472                     entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
473                         return 1;
474         }
475 #endif
476         return 0;
477 }
478
479 static void
480 ipq_dev_drop(int ifindex)
481 {
482         struct ipq_queue_entry *entry;
483
484         while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
485                 ipq_issue_verdict(entry, NF_DROP);
486 }
487
488 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
489
490 static inline void
491 ipq_rcv_skb(struct sk_buff *skb)
492 {
493         int status, type, pid, flags, nlmsglen, skblen;
494         struct nlmsghdr *nlh;
495
496         skblen = skb->len;
497         if (skblen < sizeof(*nlh))
498                 return;
499
500         nlh = (struct nlmsghdr *)skb->data;
501         nlmsglen = nlh->nlmsg_len;
502         if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
503                 return;
504
505         pid = nlh->nlmsg_pid;
506         flags = nlh->nlmsg_flags;
507
508         if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
509                 RCV_SKB_FAIL(-EINVAL);
510
511         if (flags & MSG_TRUNC)
512                 RCV_SKB_FAIL(-ECOMM);
513
514         type = nlh->nlmsg_type;
515         if (type < NLMSG_NOOP || type >= IPQM_MAX)
516                 RCV_SKB_FAIL(-EINVAL);
517
518         if (type <= IPQM_BASE)
519                 return;
520
521         if (security_netlink_recv(skb, CAP_NET_ADMIN))
522                 RCV_SKB_FAIL(-EPERM);
523
524         write_lock_bh(&queue_lock);
525
526         if (peer_pid) {
527                 if (peer_pid != pid) {
528                         write_unlock_bh(&queue_lock);
529                         RCV_SKB_FAIL(-EBUSY);
530                 }
531         } else {
532                 net_enable_timestamp();
533                 peer_pid = pid;
534         }
535
536         write_unlock_bh(&queue_lock);
537
538         status = ipq_receive_peer(NLMSG_DATA(nlh), type,
539                                   nlmsglen - NLMSG_LENGTH(0));
540         if (status < 0)
541                 RCV_SKB_FAIL(status);
542
543         if (flags & NLM_F_ACK)
544                 netlink_ack(skb, nlh, 0);
545         return;
546 }
547
548 static void
549 ipq_rcv_sk(struct sock *sk, int len)
550 {
551         struct sk_buff *skb;
552         unsigned int qlen;
553
554         mutex_lock(&ipqnl_mutex);
555
556         for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
557                 skb = skb_dequeue(&sk->sk_receive_queue);
558                 ipq_rcv_skb(skb);
559                 kfree_skb(skb);
560         }
561
562         mutex_unlock(&ipqnl_mutex);
563 }
564
565 static int
566 ipq_rcv_dev_event(struct notifier_block *this,
567                   unsigned long event, void *ptr)
568 {
569         struct net_device *dev = ptr;
570
571         /* Drop any packets associated with the downed device */
572         if (event == NETDEV_DOWN)
573                 ipq_dev_drop(dev->ifindex);
574         return NOTIFY_DONE;
575 }
576
577 static struct notifier_block ipq_dev_notifier = {
578         .notifier_call  = ipq_rcv_dev_event,
579 };
580
581 static int
582 ipq_rcv_nl_event(struct notifier_block *this,
583                  unsigned long event, void *ptr)
584 {
585         struct netlink_notify *n = ptr;
586
587         if (event == NETLINK_URELEASE &&
588             n->protocol == NETLINK_FIREWALL && n->pid) {
589                 write_lock_bh(&queue_lock);
590                 if (n->pid == peer_pid)
591                         __ipq_reset();
592                 write_unlock_bh(&queue_lock);
593         }
594         return NOTIFY_DONE;
595 }
596
597 static struct notifier_block ipq_nl_notifier = {
598         .notifier_call  = ipq_rcv_nl_event,
599 };
600
601 static struct ctl_table_header *ipq_sysctl_header;
602
603 static ctl_table ipq_table[] = {
604         {
605                 .ctl_name       = NET_IPQ_QMAX,
606                 .procname       = NET_IPQ_QMAX_NAME,
607                 .data           = &queue_maxlen,
608                 .maxlen         = sizeof(queue_maxlen),
609                 .mode           = 0644,
610                 .proc_handler   = proc_dointvec
611         },
612         { .ctl_name = 0 }
613 };
614
615 static ctl_table ipq_dir_table[] = {
616         {
617                 .ctl_name       = NET_IPV4,
618                 .procname       = "ipv4",
619                 .mode           = 0555,
620                 .child          = ipq_table
621         },
622         { .ctl_name = 0 }
623 };
624
625 static ctl_table ipq_root_table[] = {
626         {
627                 .ctl_name       = CTL_NET,
628                 .procname       = "net",
629                 .mode           = 0555,
630                 .child          = ipq_dir_table
631         },
632         { .ctl_name = 0 }
633 };
634
635 #ifdef CONFIG_PROC_FS
636 static int
637 ipq_get_info(char *buffer, char **start, off_t offset, int length)
638 {
639         int len;
640
641         read_lock_bh(&queue_lock);
642
643         len = sprintf(buffer,
644                       "Peer PID          : %d\n"
645                       "Copy mode         : %hu\n"
646                       "Copy range        : %u\n"
647                       "Queue length      : %u\n"
648                       "Queue max. length : %u\n"
649                       "Queue dropped     : %u\n"
650                       "Netlink dropped   : %u\n",
651                       peer_pid,
652                       copy_mode,
653                       copy_range,
654                       queue_total,
655                       queue_maxlen,
656                       queue_dropped,
657                       queue_user_dropped);
658
659         read_unlock_bh(&queue_lock);
660
661         *start = buffer + offset;
662         len -= offset;
663         if (len > length)
664                 len = length;
665         else if (len < 0)
666                 len = 0;
667         return len;
668 }
669 #endif /* CONFIG_PROC_FS */
670
671 static struct nf_queue_handler nfqh = {
672         .name   = "ip_queue",
673         .outfn  = &ipq_enqueue_packet,
674 };
675
676 static int __init ip_queue_init(void)
677 {
678         int status = -ENOMEM;
679         struct proc_dir_entry *proc;
680
681         netlink_register_notifier(&ipq_nl_notifier);
682         ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk,
683                                       THIS_MODULE);
684         if (ipqnl == NULL) {
685                 printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
686                 goto cleanup_netlink_notifier;
687         }
688
689         proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
690         if (proc)
691                 proc->owner = THIS_MODULE;
692         else {
693                 printk(KERN_ERR "ip_queue: failed to create proc entry\n");
694                 goto cleanup_ipqnl;
695         }
696
697         register_netdevice_notifier(&ipq_dev_notifier);
698         ipq_sysctl_header = register_sysctl_table(ipq_root_table);
699
700         status = nf_register_queue_handler(PF_INET, &nfqh);
701         if (status < 0) {
702                 printk(KERN_ERR "ip_queue: failed to register queue handler\n");
703                 goto cleanup_sysctl;
704         }
705         return status;
706
707 cleanup_sysctl:
708         unregister_sysctl_table(ipq_sysctl_header);
709         unregister_netdevice_notifier(&ipq_dev_notifier);
710         proc_net_remove(IPQ_PROC_FS_NAME);
711
712 cleanup_ipqnl:
713         sock_release(ipqnl->sk_socket);
714         mutex_lock(&ipqnl_mutex);
715         mutex_unlock(&ipqnl_mutex);
716
717 cleanup_netlink_notifier:
718         netlink_unregister_notifier(&ipq_nl_notifier);
719         return status;
720 }
721
722 static void __exit ip_queue_fini(void)
723 {
724         nf_unregister_queue_handlers(&nfqh);
725         synchronize_net();
726         ipq_flush(NF_DROP);
727
728         unregister_sysctl_table(ipq_sysctl_header);
729         unregister_netdevice_notifier(&ipq_dev_notifier);
730         proc_net_remove(IPQ_PROC_FS_NAME);
731
732         sock_release(ipqnl->sk_socket);
733         mutex_lock(&ipqnl_mutex);
734         mutex_unlock(&ipqnl_mutex);
735
736         netlink_unregister_notifier(&ipq_nl_notifier);
737 }
738
739 MODULE_DESCRIPTION("IPv4 packet queue handler");
740 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
741 MODULE_LICENSE("GPL");
742
743 module_init(ip_queue_init);
744 module_exit(ip_queue_fini);