aboutsummaryrefslogtreecommitdiffstats
path: root/net/netfilter/nf_conntrack_standalone.c
blob: 98844c87d01e8ea1e9a160a984155be52f6ac2ff (plain) (blame)
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
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
 *
 * 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.
 */

#include <linux/types.h>
#include <linux/netfilter.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/percpu.h>
#include <linux/netdevice.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
#include <linux/rculist_nulls.h>

MODULE_LICENSE("GPL");

#ifdef CONFIG_NF_CONNTRACK_PROCFS
void
print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
            const struct nf_conntrack_l3proto *l3proto,
            const struct nf_conntrack_l4proto *l4proto)
{
	switch (l3proto->l3proto) {
	case NFPROTO_IPV4:
		seq_printf(s, "src=%pI4 dst=%pI4 ",
			   &tuple->src.u3.ip, &tuple->dst.u3.ip);
		break;
	case NFPROTO_IPV6:
		seq_printf(s, "src=%pI6 dst=%pI6 ",
			   tuple->src.u3.ip6, tuple->dst.u3.ip6);
		break;
	default:
		break;
	}

	switch (l4proto->l4proto) {
	case IPPROTO_ICMP:
		seq_printf(s, "type=%u code=%u id=%u ",
			   tuple->dst.u.icmp.type,
			   tuple->dst.u.icmp.code,
			   ntohs(tuple->src.u.icmp.id));
		break;
	case IPPROTO_TCP:
		seq_printf(s, "sport=%hu dport=%hu ",
			   ntohs(tuple->src.u.tcp.port),
			   ntohs(tuple->dst.u.tcp.port));
		break;
	case IPPROTO_UDPLITE: /* fallthrough */
	case IPPROTO_UDP:
		seq_printf(s, "sport=%hu dport=%hu ",
			   ntohs(tuple->src.u.udp.port),
			   ntohs(tuple->dst.u.udp.port));

		break;
	case IPPROTO_DCCP:
		seq_printf(s, "sport=%hu dport=%hu ",
			   ntohs(tuple->src.u.dccp.port),
			   ntohs(tuple->dst.u.dccp.port));
		break;
	case IPPROTO_SCTP:
		seq_printf(s, "sport=%hu dport=%hu ",
			   ntohs(tuple->src.u.sctp.port),
			   ntohs(tuple->dst.u.sctp.port));
		break;
	case IPPROTO_ICMPV6:
		seq_printf(s, "type=%u code=%u id=%u ",
			   tuple->dst.u.icmp.type,
			   tuple->dst.u.icmp.code,
			   ntohs(tuple->src.u.icmp.id));
		break;
	case IPPROTO_GRE:
		seq_printf(s, "srckey=0x%x dstkey=0x%x ",
			   ntohs(tuple->src.u.gre.key),
			   ntohs(tuple->dst.u.gre.key));
		break;
	default:
		break;
	}
}
EXPORT_SYMBOL_GPL(print_tuple);

struct ct_iter_state {
	struct seq_net_private p;
	struct hlist_nulls_head *hash;
	unsigned int htable_size;
	unsigned int bucket;
	u_int64_t time_now;
};

static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
{
	struct ct_iter_state *st = seq->private;
	struct hlist_nulls_node *n;

	for (st->bucket = 0;
	     st->bucket < st->htable_size;
	     st->bucket++) {
		n = rcu_dereference(
			hlist_nulls_first_rcu(&st->hash[st->bucket]));
		if (!is_a_nulls(n))
			return n;
	}
	return NULL;
}

static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
				      struct hlist_nulls_node *head)
{
	struct ct_iter_state *st = seq->private;

	head = rcu_dereference(hlist_nulls_next_rcu(head));
	while (is_a_nulls(head)) {
		if (likely(get_nulls_value(head) == st->bucket)) {
			if (++st->bucket >= st->htable_size)
				return NULL;
		}
		head = rcu_dereference(
			hlist_nulls_first_rcu(&st->hash[st->bucket]));
	}
	return head;
}

static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
{
	struct hlist_nulls_node *head = ct_get_first(seq);

	if (head)
		while (pos && (head = ct_get_next(seq, head)))
			pos--;
	return pos ? NULL : head;
}

static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(RCU)
{
	struct ct_iter_state *st = seq->private;

	st->time_now = ktime_get_real_ns();
	rcu_read_lock();

	nf_conntrack_get_ht(&st->hash, &st->htable_size);
	return ct_get_idx(seq, *pos);
}

static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
	(*pos)++;
	return ct_get_next(s, v);
}

static void ct_seq_stop(struct seq_file *s, void *v)
	__releases(RCU)
{
	rcu_read_unlock();
}

#ifdef CONFIG_NF_CONNTRACK_SECMARK
static void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
	int ret;
	u32 len;
	char *secctx;

	ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
	if (ret)
		return;

	seq_printf(s, "secctx=%s ", secctx);

	security_release_secctx(secctx, len);
}
#else
static inline void ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
{
}
#endif

#ifdef CONFIG_NF_CONNTRACK_ZONES
static void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
			 int dir)
{
	const struct nf_conntrack_zone *zone = nf_ct_zone(ct);

	if (zone->dir != dir)
		return;
	switch (zone->dir) {
	case NF_CT_DEFAULT_ZONE_DIR:
		seq_printf(s, "zone=%u ", zone->id);
		break;
	case NF_CT_ZONE_DIR_ORIG:
		seq_printf(s, "zone-orig=%u ", zone->id);
		break;
	case NF_CT_ZONE_DIR_REPL:
		seq_printf(s, "zone-reply=%u ", zone->id);
		break;
	default:
		break;
	}
}
#else
static inline void ct_show_zone(struct seq_file *s, const struct nf_conn *ct,
				int dir)
{
}
#endif

#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
static void ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
{
	struct ct_iter_state *st = s->private;
	struct nf_conn_tstamp *tstamp;
	s64 delta_time;

	tstamp = nf_conn_tstamp_find(ct);
	if (tstamp) {
		delta_time = st->time_now - tstamp->start;
		if (delta_time > 0)
			delta_time = div_s64(delta_time, NSEC_PER_SEC);
		else
			delta_time = 0;

		seq_printf(s, "delta-time=%llu ",
			   (unsigned long long)delta_time);
	}
	return;
}
#else
static inline void
ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
{
}
#endif

static const char* l3proto_name(u16 proto)
{
	switch (proto) {
	case AF_INET: return "ipv4";
	case AF_INET6: return "ipv6";
	}

	return "unknown";
}

static const char* l4proto_name(u16 proto)
{
	switch (proto) {
	case IPPROTO_ICMP: return "icmp";
	case IPPROTO_TCP: return "tcp";
	case IPPROTO_UDP: return "udp";
	case IPPROTO_DCCP: return "dccp";
	case IPPROTO_GRE: return "gre";
	case IPPROTO_SCTP: return "sctp";
	case IPPROTO_UDPLITE: return "udplite";
	}

	return "unknown";
}

/* return 0 on success, 1 in case of error */
static int ct_seq_show(struct seq_file *s, void *v)
{
	struct nf_conntrack_tuple_hash *hash = v;
	struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
	const struct nf_conntrack_l3proto *l3proto;
	const struct nf_conntrack_l4proto *l4proto;
	struct net *net = seq_file_net(s);
	int ret = 0;

	WARN_ON(!ct);
	if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
		return 0;

	if (nf_ct_should_gc(ct)) {
		nf_ct_kill(ct);
		goto release;
	}

	/* we only want to print DIR_ORIGINAL */
	if (NF_CT_DIRECTION(hash))
		goto release;

	if (!net_eq(nf_ct_net(ct), net))
		goto release;

	l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
	WARN_ON(!l3proto);
	l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
	WARN_ON(!l4proto);

	ret = -ENOSPC;
	seq_printf(s, "%-8s %u %-8s %u ",
		   l3proto_name(l3proto->l3proto), nf_ct_l3num(ct),
		   l4proto_name(l4proto->l4proto), nf_ct_protonum(ct));

	if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
		seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);

	if (l4proto->print_conntrack)
		l4proto->print_conntrack(s, ct);

	print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
		    l3proto, l4proto);

	ct_show_zone(s, ct, NF_CT_ZONE_DIR_ORIG);

	if (seq_has_overflowed(s))
		goto release;

	if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
		goto release;

	if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
		seq_puts(s, "[UNREPLIED] ");

	print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
		    l3proto, l4proto);

	ct_show_zone(s, ct, NF_CT_ZONE_DIR_REPL);

	if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
		goto release;

	if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
		seq_puts(s, "[OFFLOAD] ");
	else if (test_bit(IPS_ASSURED_BIT, &ct->status))
		seq_puts(s, "[ASSURED] ");

	if (seq_has_overflowed(s))
		goto release;

#if defined(CONFIG_NF_CONNTRACK_MARK)
	seq_printf(s, "mark=%u ", ct->mark);
#endif

	ct_show_secctx(s, ct);
	ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
	ct_show_delta_time(s, ct);

	seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));

	if (seq_has_overflowed(s))
		goto release;

	ret = 0;
release:
	nf_ct_put(ct);
	return ret;
}

static const struct seq_operations ct_seq_ops = {
	.start = ct_seq_start,
	.next  = ct_seq_next,
	.stop  = ct_seq_stop,
	.show  = ct_seq_show
};

static int ct_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &ct_seq_ops,
			sizeof(struct ct_iter_state));
}

static const struct file_operations ct_file_ops = {
	.open    = ct_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net,
};

static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	int cpu;

	if (*pos == 0)
		return SEQ_START_TOKEN;

	for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
		if (!cpu_possible(cpu))
			continue;
		*pos = cpu + 1;
		return per_cpu_ptr(net->ct.stat, cpu);
	}

	return NULL;
}

static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	int cpu;

	for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
		if (!cpu_possible(cpu))
			continue;
		*pos = cpu + 1;
		return per_cpu_ptr(net->ct.stat, cpu);
	}

	return NULL;
}

static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
{
}

static int ct_cpu_seq_show(struct seq_file *seq, void *v)
{
	struct net *net = seq_file_net(seq);
	unsigned int nr_conntracks = atomic_read(&net->ct.count);
	const struct ip_conntrack_stat *st = v;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
		return 0;
	}

	seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
			"%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
		   nr_conntracks,
		   0,
		   st->found,
		   0,
		   st->invalid,
		   st->ignore,
		   0,
		   0,
		   st->insert,
		   st->insert_failed,
		   st->drop,
		   st->early_drop,
		   st->error,

		   st->expect_new,
		   st->expect_create,
		   st->expect_delete,
		   st->search_restart
		);
	return 0;
}

static const struct seq_operations ct_cpu_seq_ops = {
	.start	= ct_cpu_seq_start,
	.next	= ct_cpu_seq_next,
	.stop	= ct_cpu_seq_stop,
	.show	= ct_cpu_seq_show,
};

static int ct_cpu_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &ct_cpu_seq_ops,
			    sizeof(struct seq_net_private));
}

static const struct file_operations ct_cpu_seq_fops = {
	.open	 = ct_cpu_seq_open,
	.read	 = seq_read,
	.llseek	 = seq_lseek,
	.release = seq_release_net,
};

static int nf_conntrack_standalone_init_proc(struct net *net)
{
	struct proc_dir_entry *pde;
	kuid_t root_uid;
	kgid_t root_gid;

	pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
	if (!pde)
		goto out_nf_conntrack;

	root_uid = make_kuid(net->user_ns, 0);
	root_gid = make_kgid(net->user_ns, 0);
	if (uid_valid(root_uid) && gid_valid(root_gid))
		proc_set_user(pde, root_uid, root_gid);

	pde = proc_create("nf_conntrack", 0444, net->proc_net_stat,
			  &ct_cpu_seq_fops);
	if (!pde)
		goto out_stat_nf_conntrack;
	return 0;

out_stat_nf_conntrack:
	remove_proc_entry("nf_conntrack", net->proc_net);
out_nf_conntrack:
	return -ENOMEM;
}

static void nf_conntrack_standalone_fini_proc(struct net *net)
{
	remove_proc_entry("nf_conntrack", net->proc_net_stat);
	remove_proc_entry("nf_conntrack", net->proc_net);
}
#else
static int nf_conntrack_standalone_init_proc(struct net *net)
{
	return 0;
}

static void nf_conntrack_standalone_fini_proc(struct net *net)
{
}
#endif /* CONFIG_NF_CONNTRACK_PROCFS */

/* Sysctl support */

#ifdef CONFIG_SYSCTL
/* Log invalid packets of a given protocol */
static int log_invalid_proto_min __read_mostly;
static int log_invalid_proto_max __read_mostly = 255;

/* size the user *wants to set */
static unsigned int nf_conntrack_htable_size_user __read_mostly;

static int
nf_conntrack_hash_sysctl(struct ctl_table *table, int write,
			 void __user *buffer, size_t *lenp, loff_t *ppos)
{
	int ret;

	ret = proc_dointvec(table, write, buffer, lenp, ppos);
	if (ret < 0 || !write)
		return ret;

	/* update ret, we might not be able to satisfy request */
	ret = nf_conntrack_hash_resize(nf_conntrack_htable_size_user);

	/* update it to the actual value used by conntrack */
	nf_conntrack_htable_size_user = nf_conntrack_htable_size;
	return ret;
}

static struct ctl_table_header *nf_ct_netfilter_header;

static struct ctl_table nf_ct_sysctl_table[] = {
	{
		.procname	= "nf_conntrack_max",
		.data		= &nf_conntrack_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "nf_conntrack_count",
		.data		= &init_net.ct.count,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname       = "nf_conntrack_buckets",
		.data           = &nf_conntrack_htable_size_user,
		.maxlen         = sizeof(unsigned int),
		.mode           = 0644,
		.proc_handler   = nf_conntrack_hash_sysctl,
	},
	{
		.procname	= "nf_conntrack_checksum",
		.data		= &init_net.ct.sysctl_checksum,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "nf_conntrack_log_invalid",
		.data		= &init_net.ct.sysctl_log_invalid,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &log_invalid_proto_min,
		.extra2		= &log_invalid_proto_max,
	},
	{
		.procname	= "nf_conntrack_expect_max",
		.data		= &nf_ct_expect_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

static struct ctl_table nf_ct_netfilter_table[] = {
	{
		.procname	= "nf_conntrack_max",
		.data		= &nf_conntrack_max,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
	struct ctl_table *table;

	table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
			GFP_KERNEL);
	if (!table)
		goto out_kmemdup;

	table[1].data = &net->ct.count;
	table[3].data = &net->ct.sysctl_checksum;
	table[4].data = &net->ct.sysctl_log_invalid;

	/* Don't export sysctls to unprivileged users */
	if (net->user_ns != &init_user_ns)
		table[0].procname = NULL;

	if (!net_eq(&init_net, net))
		table[2].mode = 0444;

	net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
	if (!net->ct.sysctl_header)
		goto out_unregister_netfilter;

	return 0;

out_unregister_netfilter:
	kfree(table);
out_kmemdup:
	return -ENOMEM;
}

static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
	struct ctl_table *table;

	table = net->ct.sysctl_header->ctl_table_arg;
	unregister_net_sysctl_table(net->ct.sysctl_header);
	kfree(table);
}
#else
static int nf_conntrack_standalone_init_sysctl(struct net *net)
{
	return 0;
}

static void nf_conntrack_standalone_fini_sysctl(struct net *net)
{
}
#endif /* CONFIG_SYSCTL */

static int nf_conntrack_pernet_init(struct net *net)
{
	int ret;

	ret = nf_conntrack_init_net(net);
	if (ret < 0)
		goto out_init;

	ret = nf_conntrack_standalone_init_proc(net);
	if (ret < 0)
		goto out_proc;

	net->ct.sysctl_checksum = 1;
	net->ct.sysctl_log_invalid = 0;
	ret = nf_conntrack_standalone_init_sysctl(net);
	if (ret < 0)
		goto out_sysctl;

	return 0;

out_sysctl:
	nf_conntrack_standalone_fini_proc(net);
out_proc:
	nf_conntrack_cleanup_net(net);
out_init:
	return ret;
}

static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
{
	struct net *net;

	list_for_each_entry(net, net_exit_list, exit_list) {
		nf_conntrack_standalone_fini_sysctl(net);
		nf_conntrack_standalone_fini_proc(net);
	}
	nf_conntrack_cleanup_net_list(net_exit_list);
}

static struct pernet_operations nf_conntrack_net_ops = {
	.init		= nf_conntrack_pernet_init,
	.exit_batch	= nf_conntrack_pernet_exit,
	.async		= true,
};

static int __init nf_conntrack_standalone_init(void)
{
	int ret = nf_conntrack_init_start();
	if (ret < 0)
		goto out_start;

	BUILD_BUG_ON(SKB_NFCT_PTRMASK != NFCT_PTRMASK);
	BUILD_BUG_ON(NFCT_INFOMASK <= IP_CT_NUMBER);

#ifdef CONFIG_SYSCTL
	nf_ct_netfilter_header =
		register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
	if (!nf_ct_netfilter_header) {
		pr_err("nf_conntrack: can't register to sysctl.\n");
		ret = -ENOMEM;
		goto out_sysctl;
	}

	nf_conntrack_htable_size_user = nf_conntrack_htable_size;
#endif

	ret = register_pernet_subsys(&nf_conntrack_net_ops);
	if (ret < 0)
		goto out_pernet;

	nf_conntrack_init_end();
	return 0;

out_pernet:
#ifdef CONFIG_SYSCTL
	unregister_net_sysctl_table(nf_ct_netfilter_header);
out_sysctl:
#endif
	nf_conntrack_cleanup_end();
out_start:
	return ret;
}

static void __exit nf_conntrack_standalone_fini(void)
{
	nf_conntrack_cleanup_start();
	unregister_pernet_subsys(&nf_conntrack_net_ops);
#ifdef CONFIG_SYSCTL
	unregister_net_sysctl_table(nf_ct_netfilter_header);
#endif
	nf_conntrack_cleanup_end();
}

module_init(nf_conntrack_standalone_init);
module_exit(nf_conntrack_standalone_fini);

/* Some modules need us, but don't depend directly on any symbol.
   They should call this. */
void need_conntrack(void)
{
}
EXPORT_SYMBOL_GPL(need_conntrack);