aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv6/netfilter/ip6_queue.c
blob: 66a2c41352515fb64eaadf8e7761e20030fac08e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
/*
 * This is a module which is used for queueing IPv6 packets and
 * communicating with userspace via netlink.
 *
 * (C) 2001 Fernando Anton, this code is GPL.
 *     IPv64 Project - Work based in IPv64 draft by Arturo Azcorra.
 *     Universidad Carlos III de Madrid - Leganes (Madrid) - Spain
 *     Universidad Politecnica de Alcala de Henares - Alcala de H. (Madrid) - Spain
 *     email: fanton@it.uc3m.es
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 2001-11-06: First try. Working with ip_queue.c for IPv4 and trying
 *             to adapt it to IPv6
 *             HEAVILY based in ipqueue.c by James Morris. It's just
 *             a little modified version of it, so he's nearly the
 *             real coder of this.
 *             Few changes needed, mainly the hard_routing code and
 *             the netlink socket protocol (we're NETLINK_IP6_FW).
 * 2002-06-25: Code cleanup. [JM: ported cleanup over from ip_queue.c]
 * 2005-02-04: Added /proc counter for dropped packets; fixed so
 *             packets aren't delivered to user space if they're going
 *             to be dropped.
 */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/ipv6.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/mutex.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <linux/netfilter_ipv4/ip_queue.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>

#define IPQ_QMAX_DEFAULT 1024
#define IPQ_PROC_FS_NAME "ip6_queue"
#define NET_IPQ_QMAX 2088
#define NET_IPQ_QMAX_NAME "ip6_queue_maxlen"

struct ipq_queue_entry {
	struct list_head list;
	struct nf_info *info;
	struct sk_buff *skb;
};

typedef int (*ipq_cmpfn)(struct ipq_queue_entry *, unsigned long);

static unsigned char copy_mode __read_mostly = IPQ_COPY_NONE;
static unsigned int queue_maxlen __read_mostly = IPQ_QMAX_DEFAULT;
static DEFINE_RWLOCK(queue_lock);
static int peer_pid __read_mostly;
static unsigned int copy_range __read_mostly;
static unsigned int queue_total;
static unsigned int queue_dropped = 0;
static unsigned int queue_user_dropped = 0;
static struct sock *ipqnl __read_mostly;
static LIST_HEAD(queue_list);
static DEFINE_MUTEX(ipqnl_mutex);

static void
ipq_issue_verdict(struct ipq_queue_entry *entry, int verdict)
{
	local_bh_disable();
	nf_reinject(entry->skb, entry->info, verdict);
	local_bh_enable();
	kfree(entry);
}

static inline void
__ipq_enqueue_entry(struct ipq_queue_entry *entry)
{
       list_add(&entry->list, &queue_list);
       queue_total++;
}

/*
 * Find and return a queued entry matched by cmpfn, or return the last
 * entry if cmpfn is NULL.
 */
static inline struct ipq_queue_entry *
__ipq_find_entry(ipq_cmpfn cmpfn, unsigned long data)
{
	struct list_head *p;

	list_for_each_prev(p, &queue_list) {
		struct ipq_queue_entry *entry = (struct ipq_queue_entry *)p;

		if (!cmpfn || cmpfn(entry, data))
			return entry;
	}
	return NULL;
}

static inline void
__ipq_dequeue_entry(struct ipq_queue_entry *entry)
{
	list_del(&entry->list);
	queue_total--;
}

static inline struct ipq_queue_entry *
__ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
{
	struct ipq_queue_entry *entry;

	entry = __ipq_find_entry(cmpfn, data);
	if (entry == NULL)
		return NULL;

	__ipq_dequeue_entry(entry);
	return entry;
}


static inline void
__ipq_flush(int verdict)
{
	struct ipq_queue_entry *entry;

	while ((entry = __ipq_find_dequeue_entry(NULL, 0)))
		ipq_issue_verdict(entry, verdict);
}

static inline int
__ipq_set_mode(unsigned char mode, unsigned int range)
{
	int status = 0;

	switch(mode) {
	case IPQ_COPY_NONE:
	case IPQ_COPY_META:
		copy_mode = mode;
		copy_range = 0;
		break;

	case IPQ_COPY_PACKET:
		copy_mode = mode;
		copy_range = range;
		if (copy_range > 0xFFFF)
			copy_range = 0xFFFF;
		break;

	default:
		status = -EINVAL;

	}
	return status;
}

static inline void
__ipq_reset(void)
{
	peer_pid = 0;
	net_disable_timestamp();
	__ipq_set_mode(IPQ_COPY_NONE, 0);
	__ipq_flush(NF_DROP);
}

static struct ipq_queue_entry *
ipq_find_dequeue_entry(ipq_cmpfn cmpfn, unsigned long data)
{
	struct ipq_queue_entry *entry;

	write_lock_bh(&queue_lock);
	entry = __ipq_find_dequeue_entry(cmpfn, data);
	write_unlock_bh(&queue_lock);
	return entry;
}

static void
ipq_flush(int verdict)
{
	write_lock_bh(&queue_lock);
	__ipq_flush(verdict);
	write_unlock_bh(&queue_lock);
}

static struct sk_buff *
ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
{
	unsigned char *old_tail;
	size_t size = 0;
	size_t data_len = 0;
	struct sk_buff *skb;
	struct ipq_packet_msg *pmsg;
	struct nlmsghdr *nlh;
	struct timeval tv;

	read_lock_bh(&queue_lock);

	switch (copy_mode) {
	case IPQ_COPY_META:
	case IPQ_COPY_NONE:
		size = NLMSG_SPACE(sizeof(*pmsg));
		data_len = 0;
		break;

	case IPQ_COPY_PACKET:
		if ((entry->skb->ip_summed == CHECKSUM_PARTIAL ||
		     entry->skb->ip_summed == CHECKSUM_COMPLETE) &&
		    (*errp = skb_checksum_help(entry->skb))) {
			read_unlock_bh(&queue_lock);
			return NULL;
		}
		if (copy_range == 0 || copy_range > entry->skb->len)
			data_len = entry->skb->len;
		else
			data_len = copy_range;

		size = NLMSG_SPACE(sizeof(*pmsg) + data_len);
		break;

	default:
		*errp = -EINVAL;
		read_unlock_bh(&queue_lock);
		return NULL;
	}

	read_unlock_bh(&queue_lock);

	skb = alloc_skb(size, GFP_ATOMIC);
	if (!skb)
		goto nlmsg_failure;

	old_tail= skb->tail;
	nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
	pmsg = NLMSG_DATA(nlh);
	memset(pmsg, 0, sizeof(*pmsg));

	pmsg->packet_id       = (unsigned long )entry;
	pmsg->data_len        = data_len;
	tv = ktime_to_timeval(entry->skb->tstamp);
	pmsg->timestamp_sec   = tv.tv_sec;
	pmsg->timestamp_usec  = tv.tv_usec;
	pmsg->mark            = entry->skb->mark;
	pmsg->hook            = entry->info->hook;
	pmsg->hw_protocol     = entry->skb->protocol;

	if (entry->info->indev)
		strcpy(pmsg->indev_name, entry->info->indev->name);
	else
		pmsg->indev_name[0] = '\0';

	if (entry->info->outdev)
		strcpy(pmsg->outdev_name, entry->info->outdev->name);
	else
		pmsg->outdev_name[0] = '\0';

	if (entry->info->indev && entry->skb->dev) {
		pmsg->hw_type = entry->skb->dev->type;
		if (entry->skb->dev->hard_header_parse)
			pmsg->hw_addrlen =
				entry->skb->dev->hard_header_parse(entry->skb,
								   pmsg->hw_addr);
	}

	if (data_len)
		if (skb_copy_bits(entry->skb, 0, pmsg->payload, data_len))
			BUG();

	nlh->nlmsg_len = skb->tail - old_tail;
	return skb;

nlmsg_failure:
	if (skb)
		kfree_skb(skb);
	*errp = -EINVAL;
	printk(KERN_ERR "ip6_queue: error creating packet message\n");
	return NULL;
}

static int
ipq_enqueue_packet(struct sk_buff *skb, struct nf_info *info,
		   unsigned int queuenum, void *data)
{
	int status = -EINVAL;
	struct sk_buff *nskb;
	struct ipq_queue_entry *entry;

	if (copy_mode == IPQ_COPY_NONE)
		return -EAGAIN;

	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL) {
		printk(KERN_ERR "ip6_queue: OOM in ipq_enqueue_packet()\n");
		return -ENOMEM;
	}

	entry->info = info;
	entry->skb = skb;

	nskb = ipq_build_packet_message(entry, &status);
	if (nskb == NULL)
		goto err_out_free;

	write_lock_bh(&queue_lock);

	if (!peer_pid)
		goto err_out_free_nskb;

	if (queue_total >= queue_maxlen) {
		queue_dropped++;
		status = -ENOSPC;
		if (net_ratelimit())
			printk (KERN_WARNING "ip6_queue: fill at %d entries, "
				"dropping packet(s).  Dropped: %d\n", queue_total,
				queue_dropped);
		goto err_out_free_nskb;
	}

	/* netlink_unicast will either free the nskb or attach it to a socket */
	status = netlink_unicast(ipqnl, nskb, peer_pid, MSG_DONTWAIT);
	if (status < 0) {
		queue_user_dropped++;
		goto err_out_unlock;
	}

	__ipq_enqueue_entry(entry);

	write_unlock_bh(&queue_lock);
	return status;

err_out_free_nskb:
	kfree_skb(nskb);

err_out_unlock:
	write_unlock_bh(&queue_lock);

err_out_free:
	kfree(entry);
	return status;
}

static int
ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
{
	int diff;
	struct ipv6hdr *user_iph = (struct ipv6hdr *)v->payload;

	if (v->data_len < sizeof(*user_iph))
		return 0;
	diff = v->data_len - e->skb->len;
	if (diff < 0) {
		if (pskb_trim(e->skb, v->data_len))
			return -ENOMEM;
	} else if (diff > 0) {
		if (v->data_len > 0xFFFF)
			return -EINVAL;
		if (diff > skb_tailroom(e->skb)) {
			struct sk_buff *newskb;

			newskb = skb_copy_expand(e->skb,
						 skb_headroom(e->skb),
						 diff,
						 GFP_ATOMIC);
			if (newskb == NULL) {
				printk(KERN_WARNING "ip6_queue: OOM "
				      "in mangle, dropping packet\n");
				return -ENOMEM;
			}
			if (e->skb->sk)
				skb_set_owner_w(newskb, e->skb->sk);
			kfree_skb(e->skb);
			e->skb = newskb;
		}
		skb_put(e->skb, diff);
	}
	if (!skb_make_writable(&e->skb, v->data_len))
		return -ENOMEM;
	memcpy(e->skb->data, v->payload, v->data_len);
	e->skb->ip_summed = CHECKSUM_NONE;

	return 0;
}

static inline int
id_cmp(struct ipq_queue_entry *e, unsigned long id)
{
	return (id == (unsigned long )e);
}

static int
ipq_set_verdict(struct ipq_verdict_msg *vmsg, unsigned int len)
{
	struct ipq_queue_entry *entry;

	if (vmsg->value > NF_MAX_VERDICT)
		return -EINVAL;

	entry = ipq_find_dequeue_entry(id_cmp, vmsg->id);
	if (entry == NULL)
		return -ENOENT;
	else {
		int verdict = vmsg->value;

		if (vmsg->data_len && vmsg->data_len == len)
			if (ipq_mangle_ipv6(vmsg, entry) < 0)
				verdict = NF_DROP;

		ipq_issue_verdict(entry, verdict);
		return 0;
	}
}

static int
ipq_set_mode(unsigned char mode, unsigned int range)
{
	int status;

	write_lock_bh(&queue_lock);
	status = __ipq_set_mode(mode, range);
	write_unlock_bh(&queue_lock);
	return status;
}

static int
ipq_receive_peer(struct ipq_peer_msg *pmsg,
		 unsigned char type, unsigned int len)
{
	int status = 0;

	if (len < sizeof(*pmsg))
		return -EINVAL;

	switch (type) {
	case IPQM_MODE:
		status = ipq_set_mode(pmsg->msg.mode.value,
				      pmsg->msg.mode.range);
		break;

	case IPQM_VERDICT:
		if (pmsg->msg.verdict.value > NF_MAX_VERDICT)
			status = -EINVAL;
		else
			status = ipq_set_verdict(&pmsg->msg.verdict,
						 len - sizeof(*pmsg));
			break;
	default:
		status = -EINVAL;
	}
	return status;
}

static int
dev_cmp(struct ipq_queue_entry *entry, unsigned long ifindex)
{
	if (entry->info->indev)
		if (entry->info->indev->ifindex == ifindex)
			return 1;

	if (entry->info->outdev)
		if (entry->info->outdev->ifindex == ifindex)
			return 1;

	return 0;
}

static void
ipq_dev_drop(int ifindex)
{
	struct ipq_queue_entry *entry;

	while ((entry = ipq_find_dequeue_entry(dev_cmp, ifindex)) != NULL)
		ipq_issue_verdict(entry, NF_DROP);
}

#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)

static inline void
ipq_rcv_skb(struct sk_buff *skb)
{
	int status, type, pid, flags, nlmsglen, skblen;
	struct nlmsghdr *nlh;

	skblen = skb->len;
	if (skblen < sizeof(*nlh))
		return;

	nlh = (struct nlmsghdr *)skb->data;
	nlmsglen = nlh->nlmsg_len;
	if (nlmsglen < sizeof(*nlh) || skblen < nlmsglen)
		return;

	pid = nlh->nlmsg_pid;
	flags = nlh->nlmsg_flags;

	if(pid <= 0 || !(flags & NLM_F_REQUEST) || flags & NLM_F_MULTI)
		RCV_SKB_FAIL(-EINVAL);

	if (flags & MSG_TRUNC)
		RCV_SKB_FAIL(-ECOMM);

	type = nlh->nlmsg_type;
	if (type < NLMSG_NOOP || type >= IPQM_MAX)
		RCV_SKB_FAIL(-EINVAL);

	if (type <= IPQM_BASE)
		return;

	if (security_netlink_recv(skb, CAP_NET_ADMIN))
		RCV_SKB_FAIL(-EPERM);

	write_lock_bh(&queue_lock);

	if (peer_pid) {
		if (peer_pid != pid) {
			write_unlock_bh(&queue_lock);
			RCV_SKB_FAIL(-EBUSY);
		}
	} else {
		net_enable_timestamp();
		peer_pid = pid;
	}

	write_unlock_bh(&queue_lock);

	status = ipq_receive_peer(NLMSG_DATA(nlh), type,
				  nlmsglen - NLMSG_LENGTH(0));
	if (status < 0)
		RCV_SKB_FAIL(status);

	if (flags & NLM_F_ACK)
		netlink_ack(skb, nlh, 0);
	return;
}

static void
ipq_rcv_sk(struct sock *sk, int len)
{
	struct sk_buff *skb;
	unsigned int qlen;

	mutex_lock(&ipqnl_mutex);

	for (qlen = skb_queue_len(&sk->sk_receive_queue); qlen; qlen--) {
		skb = skb_dequeue(&sk->sk_receive_queue);
		ipq_rcv_skb(skb);
		kfree_skb(skb);
	}

	mutex_unlock(&ipqnl_mutex);
}

static int
ipq_rcv_dev_event(struct notifier_block *this,
		  unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;

	/* Drop any packets associated with the downed device */
	if (event == NETDEV_DOWN)
		ipq_dev_drop(dev->ifindex);
	return NOTIFY_DONE;
}

static struct notifier_block ipq_dev_notifier = {
	.notifier_call	= ipq_rcv_dev_event,
};

static int
ipq_rcv_nl_event(struct notifier_block *this,
		 unsigned long event, void *ptr)
{
	struct netlink_notify *n = ptr;

	if (event == NETLINK_URELEASE &&
	    n->protocol == NETLINK_IP6_FW && n->pid) {
		write_lock_bh(&queue_lock);
		if (n->pid == peer_pid)
			__ipq_reset();
		write_unlock_bh(&queue_lock);
	}
	return NOTIFY_DONE;
}

static struct notifier_block ipq_nl_notifier = {
	.notifier_call	= ipq_rcv_nl_event,
};

static struct ctl_table_header *ipq_sysctl_header;

static ctl_table ipq_table[] = {
	{
		.ctl_name	= NET_IPQ_QMAX,
		.procname	= NET_IPQ_QMAX_NAME,
		.data		= &queue_maxlen,
		.maxlen		= sizeof(queue_maxlen),
		.mode		= 0644,
		.proc_handler	= proc_dointvec
	},
	{ .ctl_name = 0 }
};

static ctl_table ipq_dir_table[] = {
	{
		.ctl_name	= NET_IPV6,
		.procname	= "ipv6",
		.mode		= 0555,
		.child		= ipq_table
	},
	{ .ctl_name = 0 }
};

static ctl_table ipq_root_table[] = {
	{
		.ctl_name	= CTL_NET,
		.procname	= "net",
		.mode		= 0555,
		.child		= ipq_dir_table
	},
	{ .ctl_name = 0 }
};

#ifdef CONFIG_PROC_FS
static int
ipq_get_info(char *buffer, char **start, off_t offset, int length)
{
	int len;

	read_lock_bh(&queue_lock);

	len = sprintf(buffer,
		      "Peer PID          : %d\n"
		      "Copy mode         : %hu\n"
		      "Copy range        : %u\n"
		      "Queue length      : %u\n"
		      "Queue max. length : %u\n"
		      "Queue dropped     : %u\n"
		      "Netfilter dropped : %u\n",
		      peer_pid,
		      copy_mode,
		      copy_range,
		      queue_total,
		      queue_maxlen,
		      queue_dropped,
		      queue_user_dropped);

	read_unlock_bh(&queue_lock);

	*start = buffer + offset;
	len -= offset;
	if (len > length)
		len = length;
	else if (len < 0)
		len = 0;
	return len;
}
#endif /* CONFIG_PROC_FS */

static struct nf_queue_handler nfqh = {
	.name	= "ip6_queue",
	.outfn	= &ipq_enqueue_packet,
};

static int __init ip6_queue_init(void)
{
	int status = -ENOMEM;
	struct proc_dir_entry *proc;

	netlink_register_notifier(&ipq_nl_notifier);
	ipqnl = netlink_kernel_create(NETLINK_IP6_FW, 0, ipq_rcv_sk,
				      THIS_MODULE);
	if (ipqnl == NULL) {
		printk(KERN_ERR "ip6_queue: failed to create netlink socket\n");
		goto cleanup_netlink_notifier;
	}

	proc = proc_net_create(IPQ_PROC_FS_NAME, 0, ipq_get_info);
	if (proc)
		proc->owner = THIS_MODULE;
	else {
		printk(KERN_ERR "ip6_queue: failed to create proc entry\n");
		goto cleanup_ipqnl;
	}

	register_netdevice_notifier(&ipq_dev_notifier);
	ipq_sysctl_header = register_sysctl_table(ipq_root_table);

	status = nf_register_queue_handler(PF_INET6, &nfqh);
	if (status < 0) {
		printk(KERN_ERR "ip6_queue: failed to register queue handler\n");
		goto cleanup_sysctl;
	}
	return status;

cleanup_sysctl:
	unregister_sysctl_table(ipq_sysctl_header);
	unregister_netdevice_notifier(&ipq_dev_notifier);
	proc_net_remove(IPQ_PROC_FS_NAME);

cleanup_ipqnl:
	sock_release(ipqnl->sk_socket);
	mutex_lock(&ipqnl_mutex);
	mutex_unlock(&ipqnl_mutex);

cleanup_netlink_notifier:
	netlink_unregister_notifier(&ipq_nl_notifier);
	return status;
}

static void __exit ip6_queue_fini(void)
{
	nf_unregister_queue_handlers(&nfqh);
	synchronize_net();
	ipq_flush(NF_DROP);

	unregister_sysctl_table(ipq_sysctl_header);
	unregister_netdevice_notifier(&ipq_dev_notifier);
	proc_net_remove(IPQ_PROC_FS_NAME);

	sock_release(ipqnl->sk_socket);
	mutex_lock(&ipqnl_mutex);
	mutex_unlock(&ipqnl_mutex);

	netlink_unregister_notifier(&ipq_nl_notifier);
}

MODULE_DESCRIPTION("IPv6 packet queue handler");
MODULE_LICENSE("GPL");

module_init(ip6_queue_init);
module_exit(ip6_queue_fini);

Privacy Policy