a14798a850d7334311dad6d5170b8adcd688c356
[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
201         read_lock_bh(&queue_lock);
202
203         switch (copy_mode) {
204         case IPQ_COPY_META:
205         case IPQ_COPY_NONE:
206                 size = NLMSG_SPACE(sizeof(*pmsg));
207                 data_len = 0;
208                 break;
209
210         case IPQ_COPY_PACKET:
211                 if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
212                      entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
213                     (*errp = skb_checksum_help(entry->skb))) {
214                         read_unlock_bh(&queue_lock);
215                         return NULL;
216                 }
217                 if (copy_range == 0 || copy_range > entry->skb->len)
218                         data_len = entry->skb->len;
219                 else
220                         data_len = copy_range;
221
222                 size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
223                 break;
224
225         default:
226                 *errp = -EINVAL;
227                 read_unlock_bh(&queue_lock);
228                 return NULL;
229         }
230
231         read_unlock_bh(&queue_lock);
232
233         skb = alloc_skb(size, GFP_ATOMIC);
234         if (!skb)
235                 goto nlmsg_failure;
236
237         old_tail= skb->tail;
238         nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
239         pmsg = NLMSG_DATA(nlh);
240         memset(pmsg, 0, sizeof(*pmsg));
241
242         pmsg->packet_id       = (unsigned long )entry;
243         pmsg->data_len        = data_len;
244         pmsg->timestamp_sec   = entry->skb->tstamp.off_sec;
245         pmsg->timestamp_usec  = entry->skb->tstamp.off_usec;
246         pmsg->mark            = entry->skb->mark;
247         pmsg->hook            = entry->info->hook;
248         pmsg->hw_protocol     = entry->skb->protocol;
249
250         if (entry->info->indev)
251                 strcpy(pmsg->indev_name, entry->info->indev->name);
252         else
253                 pmsg->indev_name[0] = '\0';
254
255         if (entry->info->outdev)
256                 strcpy(pmsg->outdev_name, entry->info->outdev->name);
257         else
258                 pmsg->outdev_name[0] = '\0';
259
260         if (entry->info->indev && entry->skb->dev) {
261                 pmsg->hw_type = entry->skb->dev->type;
262                 if (entry->skb->dev->hard_header_parse)
263                         pmsg->hw_addrlen =
264                                 entry->skb->dev->hard_header_parse(entry->skb,
265                                                                    pmsg->hw_addr);
266         }
267
268         if (data_len)
269                 if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
270                         BUG();
271
272         nlh->nlmsg_len = skb->tail - old_tail;
273         return skb;
274
275 nlmsg_failure:
276         if (skb)
277                 kfree_skb(skb);
278         *errp = -EINVAL;
279         printk(KERN_ERR "ip_queue: error creating packet message\n");
280         return NULL;
281 }
282
283 static int
284 ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
285                    unsigned int queuenum, void *data)
286 {
287         int status = -EINVAL;
288         struct sk_buff *nskb;
289         struct ipq_queue_entry *entry;
290
291         if (copy_mode == IPQ_COPY_NONE)
292                 return -EAGAIN;
293
294         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
295         if (entry == NULL) {
296                 printk(KERN_ERR "ip_queue: OOM in ipq_enqueue_packet()\n");
297                 return -ENOMEM;
298         }
299
300         entry->info = info;
301         entry->skb = skb;
302
303         nskb = ipq_build_packet_message(entry, &status);
304         if (nskb == NULL)
305                 goto err_out_free;
306
307         write_lock_bh(&queue_lock);
308
309         if (!peer_pid)
310                 goto err_out_free_nskb;
311
312         if (queue_total >= queue_maxlen) {
313                 queue_dropped++;
314                 status = -ENOSPC;
315                 if (net_ratelimit())
316                           printk (KERN_WARNING "ip_queue: full at %d entries, "
317                                   "dropping packets(s). Dropped: %d\n", queue_total,
318                                   queue_dropped);
319                 goto err_out_free_nskb;
320         }
321
322         /* netlink_unicast will either free the nskb or attach it to a socket */
323         status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
324         if (status < 0) {
325                 queue_user_dropped++;
326                 goto err_out_unlock;
327         }
328
329         __ipq_enqueue_entry(entry);
330
331         write_unlock_bh(&queue_lock);
332         return status;
333
334 err_out_free_nskb:
335         kfree_skb(nskb);
336
337 err_out_unlock:
338         write_unlock_bh(&queue_lock);
339
340 err_out_free:
341         kfree(entry);
342         return status;
343 }
344
345 static int
346 ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
347 {
348         int diff;
349         struct iphdr *user_iph = (struct iphdr *)v->payload;
350
351         if (v->data_len < sizeof(*user_iph))
352                 return 0;
353         diff = v->data_len - e->skb->len;
354         if (diff < 0) {
355                 if (pskb_trim(e->skb, v->data_len))
356                         return -ENOMEM;
357         } else if (diff > 0) {
358                 if (v->data_len > 0xFFFF)
359                         return -EINVAL;
360                 if (diff > skb_tailroom(e->skb)) {
361                         struct sk_buff *newskb;
362
363                         newskb = skb_copy_expand(e->skb,
364                                                  skb_headroom(e->skb),
365                                                  diff,
366                                                  GFP_ATOMIC);
367                         if (newskb == NULL) {
368                                 printk(KERN_WARNING "ip_queue: OOM "
369                                       "in mangle, dropping packet\n");
370                                 return -ENOMEM;
371                         }
372                         if (e->skb->sk)
373                                 skb_set_owner_w(newskb, e->skb->sk);
374                         kfree_skb(e->skb);
375                         e->skb = newskb;
376                 }
377                 skb_put(e->skb, diff);
378         }
379         if (!skb_make_writable(&e->skb, v->data_len))
380                 return -ENOMEM;
381         memcpy(e->skb->data, v->payload, v->data_len);
382         e->skb->ip_summed = CHECKSUM_NONE;
383
384         return 0;
385 }
386
387 static inline int
388 id_cmp(struct ipq_queue_entry *e, unsigned long id)
389 {
390         return (id == (unsigned long )e);
391 }
392
393 static int
394 ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
395 {
396         struct ipq_queue_entry *entry;
397
398         if (vmsg->value > NF_MAX_VERDICT)
399                 return -EINVAL;
400
401         entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
402         if (entry == NULL)
403                 return -ENOENT;
404         else {
405                 int verdict = vmsg->value;
406
407                 if (vmsg->data_len && vmsg->data_len == len)
408                         if (ipq_mangle_ipv4(vmsg, entry) < 0)
409                                 verdict = NF_DROP;
410
411                 ipq_issue_verdict(entry, verdict);
412                 return 0;
413         }
414 }
415
416 static int
417 ipq_set_mode(unsigned char mode, unsigned int range)
418 {
419         int status;
420
421         write_lock_bh(&queue_lock);
422         status = __ipq_set_mode(mode, range);
423         write_unlock_bh(&queue_lock);
424         return status;
425 }
426
427 static int
428 ipq_receive_peer(struct ipq_peer_msg *pmsg,
429                  unsigned char type, unsigned int len)
430 {
431         int status = 0;
432
433         if (len < sizeof(*pmsg))
434                 return -EINVAL;
435
436         switch (type) {
437         case IPQM_MODE:
438                 status = ipq_set_mode(pmsg->msg.mode.value,
439                                       pmsg->msg.mode.range);
440                 break;
441
442         case IPQM_VERDICT:
443                 if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
444                         status = -EINVAL;
445                 else
446                         status = ipq_set_verdict(&pmsg->msg.verdict,
447                                                  len - sizeof(*pmsg));
448                         break;
449         default:
450                 status = -EINVAL;
451         }
452         return status;
453 }
454
455 static int
456 dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
457 {
458         if (entry->info->indev)
459                 if (entry->info->indev->ifindex == ifindex)
460                         return 1;
461         if (entry->info->outdev)
462                 if (entry->info->outdev->ifindex == ifindex)
463                         return 1;
464 #ifdef CONFIG_BRIDGE_NETFILTER
465         if (entry->skb->nf_bridge) {
466                 if (entry->skb->nf_bridge->physindev &&
467                     entry->skb->nf_bridge->physindev->ifindex == ifindex)
468                         return 1;
469                 if (entry->skb->nf_bridge->physoutdev &&
470                     entry->skb->nf_bridge->physoutdev->ifindex == ifindex)
471                         return 1;
472         }
473 #endif
474         return 0;
475 }
476
477 static void
478 ipq_dev_drop(int ifindex)
479 {
480         struct ipq_queue_entry *entry;
481
482         while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
483                 ipq_issue_verdict(entry, NF_DROP);
484 }
485
486 #define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
487
488 static inline void
489 ipq_rcv_skb(struct sk_buff *skb)
490 {
491         int status, type, pid, flags, nlmsglen, skblen;
492         struct nlmsghdr *nlh;
493
494         skblen = skb->len;
495         if (skblen < sizeof(*nlh))
496                 return;
497
498         nlh = (struct nlmsghdr *)skb->data;
499         nlmsglen = nlh->nlmsg_len;
500         if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
501                 return;
502
503         pid = nlh->nlmsg_pid;
504         flags = nlh->nlmsg_flags;
505
506         if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
507                 RCV_SKB_FAIL(-EINVAL);
508
509         if (flags & MSG_TRUNC)
510                 RCV_SKB_FAIL(-ECOMM);
511
512         type = nlh->nlmsg_type;
513         if (type < NLMSG_NOOP || type >= IPQM_MAX)
514                 RCV_SKB_FAIL(-EINVAL);
515
516         if (type <= IPQM_BASE)
517                 return;
518
519         if (security_netlink_recv(skb, CAP_NET_ADMIN))
520                 RCV_SKB_FAIL(-EPERM);
521
522         write_lock_bh(&queue_lock);
523
524         if (peer_pid) {
525                 if (peer_pid != pid) {
526                         write_unlock_bh(&queue_lock);
527                         RCV_SKB_FAIL(-EBUSY);
528                 }
529         } else {
530                 net_enable_timestamp();
531                 peer_pid = pid;
532         }
533
534         write_unlock_bh(&queue_lock);
535
536         status = ipq_receive_peer(NLMSG_DATA(nlh), type,
537                                   nlmsglen - NLMSG_LENGTH(0));
538         if (status < 0)
539                 RCV_SKB_FAIL(status);
540
541         if (flags & NLM_F_ACK)
542                 netlink_ack(skb, nlh, 0);
543         return;
544 }
545
546 static void
547 ipq_rcv_sk(struct sock *sk, int len)
548 {
549         struct sk_buff *skb;
550         unsigned int qlen;
551
552         mutex_lock(&ipqnl_mutex);
553
554         for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
555                 skb = skb_dequeue(&sk->sk_receive_queue);
556                 ipq_rcv_skb(skb);
557                 kfree_skb(skb);
558         }
559
560         mutex_unlock(&ipqnl_mutex);
561 }
562
563 static int
564 ipq_rcv_dev_event(struct notifier_block *this,
565                   unsigned long event, void *ptr)
566 {
567         struct net_device *dev = ptr;
568
569         /* Drop any packets associated with the downed device */
570         if (event == NETDEV_DOWN)
571                 ipq_dev_drop(dev->ifindex);
572         return NOTIFY_DONE;
573 }
574
575 static struct notifier_block ipq_dev_notifier = {
576         .notifier_call  = ipq_rcv_dev_event,
577 };
578
579 static int
580 ipq_rcv_nl_event(struct notifier_block *this,
581                  unsigned long event, void *ptr)
582 {
583         struct netlink_notify *n = ptr;
584
585         if (event == NETLINK_URELEASE &&
586             n->protocol == NETLINK_FIREWALL && n->pid) {
587                 write_lock_bh(&queue_lock);
588                 if (n->pid == peer_pid)
589                         __ipq_reset();
590                 write_unlock_bh(&queue_lock);
591         }
592         return NOTIFY_DONE;
593 }
594
595 static struct notifier_block ipq_nl_notifier = {
596         .notifier_call  = ipq_rcv_nl_event,
597 };
598
599 static struct ctl_table_header *ipq_sysctl_header;
600
601 static ctl_table ipq_table[] = {
602         {
603                 .ctl_name       = NET_IPQ_QMAX,
604                 .procname       = NET_IPQ_QMAX_NAME,
605                 .data           = &queue_maxlen,
606                 .maxlen         = sizeof(queue_maxlen),
607                 .mode           = 0644,
608                 .proc_handler   = proc_dointvec
609         },
610         { .ctl_name = 0 }
611 };
612
613 static ctl_table ipq_dir_table[] = {
614         {
615                 .ctl_name       = NET_IPV4,
616                 .procname       = "ipv4",
617                 .mode           = 0555,
618                 .child          = ipq_table
619         },
620         { .ctl_name = 0 }
621 };
622
623 static ctl_table ipq_root_table[] = {
624         {
625                 .ctl_name       = CTL_NET,
626                 .procname       = "net",
627                 .mode           = 0555,
628                 .child          = ipq_dir_table
629         },
630         { .ctl_name = 0 }
631 };
632
633 #ifdef CONFIG_PROC_FS
634 static int
635 ipq_get_info(char *buffer, char **start, off_t offset, int length)
636 {
637         int len;
638
639         read_lock_bh(&queue_lock);
640
641         len = sprintf(buffer,
642                       "Peer PID          : %d\n"
643                       "Copy mode         : %hu\n"
644                       "Copy range        : %u\n"
645                       "Queue length      : %u\n"
646                       "Queue max. length : %u\n"
647                       "Queue dropped     : %u\n"
648                       "Netlink dropped   : %u\n",
649                       peer_pid,
650                       copy_mode,
651                       copy_range,
652                       queue_total,
653                       queue_maxlen,
654                       queue_dropped,
655                       queue_user_dropped);
656
657         read_unlock_bh(&queue_lock);
658
659         *start = buffer + offset;
660         len -= offset;
661         if (len > length)
662                 len = length;
663         else if (len < 0)
664                 len = 0;
665         return len;
666 }
667 #endif /* CONFIG_PROC_FS */
668
669 static struct nf_queue_handler nfqh = {
670         .name   = "ip_queue",
671         .outfn  = &ipq_enqueue_packet,
672 };
673
674 static int __init ip_queue_init(void)
675 {
676         int status = -ENOMEM;
677         struct proc_dir_entry *proc;
678
679         netlink_register_notifier(&ipq_nl_notifier);
680         ipqnl = netlink_kernel_create(NETLINK_FIREWALL, 0, ipq_rcv_sk,
681                                       THIS_MODULE);
682         if (ipqnl == NULL) {
683                 printk(KERN_ERR "ip_queue: failed to create netlink socket\n");
684                 goto cleanup_netlink_notifier;
685         }
686
687         proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
688         if (proc)
689                 proc->owner = THIS_MODULE;
690         else {
691                 printk(KERN_ERR "ip_queue: failed to create proc entry\n");
692                 goto cleanup_ipqnl;
693         }
694
695         register_netdevice_notifier(&ipq_dev_notifier);
696         ipq_sysctl_header = register_sysctl_table(ipq_root_table);
697
698         status = nf_register_queue_handler(PF_INET, &nfqh);
699         if (status < 0) {
700                 printk(KERN_ERR "ip_queue: failed to register queue handler\n");
701                 goto cleanup_sysctl;
702         }
703         return status;
704
705 cleanup_sysctl:
706         unregister_sysctl_table(ipq_sysctl_header);
707         unregister_netdevice_notifier(&ipq_dev_notifier);
708         proc_net_remove(IPQ_PROC_FS_NAME);
709
710 cleanup_ipqnl:
711         sock_release(ipqnl->sk_socket);
712         mutex_lock(&ipqnl_mutex);
713         mutex_unlock(&ipqnl_mutex);
714
715 cleanup_netlink_notifier:
716         netlink_unregister_notifier(&ipq_nl_notifier);
717         return status;
718 }
719
720 static void __exit ip_queue_fini(void)
721 {
722         nf_unregister_queue_handlers(&nfqh);
723         synchronize_net();
724         ipq_flush(NF_DROP);
725
726         unregister_sysctl_table(ipq_sysctl_header);
727         unregister_netdevice_notifier(&ipq_dev_notifier);
728         proc_net_remove(IPQ_PROC_FS_NAME);
729
730         sock_release(ipqnl->sk_socket);
731         mutex_lock(&ipqnl_mutex);
732         mutex_unlock(&ipqnl_mutex);
733
734         netlink_unregister_notifier(&ipq_nl_notifier);
735 }
736
737 MODULE_DESCRIPTION("IPv4 packet queue handler");
738 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
739 MODULE_LICENSE("GPL");
740
741 module_init(ip_queue_init);
742 module_exit(ip_queue_fini);