nf_conntrack_proto_sctp.c 20 KB
Newer Older
1
2
/*
 * Connection tracking protocol helper module for SCTP.
3
4
 *
 * SCTP is defined in RFC 2960. References to various sections in this code
5
 * are to this RFC.
6
 *
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 * 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/timer.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/sctp.h>
#include <linux/string.h>
#include <linux/seq_file.h>
21
22
#include <linux/spinlock.h>
#include <linux/interrupt.h>
23
24

#include <net/netfilter/nf_conntrack.h>
25
#include <net/netfilter/nf_conntrack_l4proto.h>
26
#include <net/netfilter/nf_conntrack_ecache.h>
27
28
29
30
31

/* Protects conntrack->proto.sctp */
static DEFINE_RWLOCK(sctp_lock);

/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
32
   closely.  They're more complex. --RR
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

   And so for me for SCTP :D -Kiran */

static const char *sctp_conntrack_names[] = {
	"NONE",
	"CLOSED",
	"COOKIE_WAIT",
	"COOKIE_ECHOED",
	"ESTABLISHED",
	"SHUTDOWN_SENT",
	"SHUTDOWN_RECD",
	"SHUTDOWN_ACK_SENT",
};

#define SECS  * HZ
#define MINS  * 60 SECS
#define HOURS * 60 MINS
#define DAYS  * 24 HOURS

52
53
54
55
56
57
58
static unsigned int nf_ct_sctp_timeout_closed __read_mostly          =  10 SECS;
static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly     =   3 SECS;
static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly   =   3 SECS;
static unsigned int nf_ct_sctp_timeout_established __read_mostly     =   5 DAYS;
static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly   = 300 SECS / 1000;
static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly   = 300 SECS / 1000;
static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
59

60
static unsigned int * sctp_timeouts[]
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
= { NULL,                                  /* SCTP_CONNTRACK_NONE  */
    &nf_ct_sctp_timeout_closed,	           /* SCTP_CONNTRACK_CLOSED */
    &nf_ct_sctp_timeout_cookie_wait,       /* SCTP_CONNTRACK_COOKIE_WAIT */
    &nf_ct_sctp_timeout_cookie_echoed,     /* SCTP_CONNTRACK_COOKIE_ECHOED */
    &nf_ct_sctp_timeout_established,       /* SCTP_CONNTRACK_ESTABLISHED */
    &nf_ct_sctp_timeout_shutdown_sent,     /* SCTP_CONNTRACK_SHUTDOWN_SENT */
    &nf_ct_sctp_timeout_shutdown_recd,     /* SCTP_CONNTRACK_SHUTDOWN_RECD */
    &nf_ct_sctp_timeout_shutdown_ack_sent  /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
 };

#define sNO SCTP_CONNTRACK_NONE
#define	sCL SCTP_CONNTRACK_CLOSED
#define	sCW SCTP_CONNTRACK_COOKIE_WAIT
#define	sCE SCTP_CONNTRACK_COOKIE_ECHOED
#define	sES SCTP_CONNTRACK_ESTABLISHED
#define	sSS SCTP_CONNTRACK_SHUTDOWN_SENT
#define	sSR SCTP_CONNTRACK_SHUTDOWN_RECD
#define	sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
#define	sIV SCTP_CONNTRACK_MAX

81
/*
82
83
	These are the descriptions of the states:

84
NOTE: These state names are tantalizingly similar to the states of an
85
SCTP endpoint. But the interpretation of the states is a little different,
86
considering that these are the states of the connection and not of an end
87
88
89
point. Please note the subtleties. -Kiran

NONE              - Nothing so far.
90
91
COOKIE WAIT       - We have seen an INIT chunk in the original direction, or also
		    an INIT_ACK chunk in the reply direction.
92
93
94
95
96
COOKIE ECHOED     - We have seen a COOKIE_ECHO chunk in the original direction.
ESTABLISHED       - We have seen a COOKIE_ACK in the reply direction.
SHUTDOWN_SENT     - We have seen a SHUTDOWN chunk in the original direction.
SHUTDOWN_RECD     - We have seen a SHUTDOWN chunk in the reply directoin.
SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
97
98
99
		    to that of the SHUTDOWN chunk.
CLOSED            - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
		    the SHUTDOWN chunk. Connection is closed.
100
101
102
*/

/* TODO
103
 - I have assumed that the first INIT is in the original direction.
104
105
 This messes things when an INIT comes in the reply direction in CLOSED
 state.
106
 - Check the error type in the reply dir before transitioning from
107
108
109
110
111
112
cookie echoed to closed.
 - Sec 5.2.4 of RFC 2960
 - Multi Homing support.
*/

/* SCTP conntrack state transitions */
113
static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
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
	{
/*	ORIGINAL	*/
/*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
/* init         */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
/* init_ack     */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
/* abort        */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
/* shutdown     */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
/* error        */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
/* cookie_echo  */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
/* cookie_ack   */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
	},
	{
/*	REPLY	*/
/*                  sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
/* init         */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
/* init_ack     */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
/* abort        */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
/* shutdown     */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
/* error        */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
/* cookie_echo  */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
/* cookie_ack   */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
	}
};

static int sctp_pkt_to_tuple(const struct sk_buff *skb,
			     unsigned int dataoff,
			     struct nf_conntrack_tuple *tuple)
{
	sctp_sctphdr_t _hdr, *hp;

	/* Actually only need first 8 bytes. */
	hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
	if (hp == NULL)
		return 0;

	tuple->src.u.sctp.port = hp->source;
	tuple->dst.u.sctp.port = hp->dest;
	return 1;
}

static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
			     const struct nf_conntrack_tuple *orig)
{
	tuple->src.u.sctp.port = orig->dst.u.sctp.port;
	tuple->dst.u.sctp.port = orig->src.u.sctp.port;
	return 1;
}

/* Print out the per-protocol part of the tuple. */
static int sctp_print_tuple(struct seq_file *s,
			    const struct nf_conntrack_tuple *tuple)
{
	return seq_printf(s, "sport=%hu dport=%hu ",
			  ntohs(tuple->src.u.sctp.port),
			  ntohs(tuple->dst.u.sctp.port));
}

/* Print out the private part of the conntrack. */
176
static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
177
178
179
180
{
	enum sctp_conntrack state;

	read_lock_bh(&sctp_lock);
181
	state = ct->proto.sctp.state;
182
183
184
185
186
187
	read_unlock_bh(&sctp_lock);

	return seq_printf(s, "%s ", sctp_conntrack_names[state]);
}

#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count)	\
188
189
190
191
for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0;	\
	(offset) < (skb)->len &&					\
	((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch)));	\
	(offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
192
193

/* Some validity checks to make sure the chunks are fine */
194
static int do_basic_checks(struct nf_conn *ct,
195
196
			   const struct sk_buff *skb,
			   unsigned int dataoff,
197
			   unsigned long *map)
198
199
200
201
202
203
204
205
{
	u_int32_t offset, count;
	sctp_chunkhdr_t _sch, *sch;
	int flag;

	flag = 0;

	for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
206
		pr_debug("Chunk Num: %d  Type: %d\n", count, sch->type);
207

208
209
210
		if (sch->type == SCTP_CID_INIT ||
		    sch->type == SCTP_CID_INIT_ACK ||
		    sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
211
212
			flag = 1;

213
214
215
216
217
		/*
		 * Cookie Ack/Echo chunks not the first OR
		 * Init / Init Ack / Shutdown compl chunks not the only chunks
		 * OR zero-length.
		 */
218
219
220
221
		if (((sch->type == SCTP_CID_COOKIE_ACK ||
		      sch->type == SCTP_CID_COOKIE_ECHO ||
		      flag) &&
		     count != 0) || !sch->length) {
222
			pr_debug("Basic checks failed\n");
223
224
225
			return 1;
		}

226
		if (map)
227
			set_bit(sch->type, map);
228
229
	}

230
	pr_debug("Basic checks passed\n");
231
	return count == 0;
232
233
234
235
236
237
238
239
}

static int new_state(enum ip_conntrack_dir dir,
		     enum sctp_conntrack cur_state,
		     int chunk_type)
{
	int i;

240
	pr_debug("Chunk type: %d\n", chunk_type);
241
242

	switch (chunk_type) {
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
	case SCTP_CID_INIT:
		pr_debug("SCTP_CID_INIT\n");
		i = 0;
		break;
	case SCTP_CID_INIT_ACK:
		pr_debug("SCTP_CID_INIT_ACK\n");
		i = 1;
		break;
	case SCTP_CID_ABORT:
		pr_debug("SCTP_CID_ABORT\n");
		i = 2;
		break;
	case SCTP_CID_SHUTDOWN:
		pr_debug("SCTP_CID_SHUTDOWN\n");
		i = 3;
		break;
	case SCTP_CID_SHUTDOWN_ACK:
		pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
		i = 4;
		break;
	case SCTP_CID_ERROR:
		pr_debug("SCTP_CID_ERROR\n");
		i = 5;
		break;
	case SCTP_CID_COOKIE_ECHO:
		pr_debug("SCTP_CID_COOKIE_ECHO\n");
		i = 6;
		break;
	case SCTP_CID_COOKIE_ACK:
		pr_debug("SCTP_CID_COOKIE_ACK\n");
		i = 7;
		break;
	case SCTP_CID_SHUTDOWN_COMPLETE:
		pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
		i = 8;
		break;
	default:
		/* Other chunks like DATA, SACK, HEARTBEAT and
		its ACK do not cause a change in state */
		pr_debug("Unknown chunk type, Will stay in %s\n",
			 sctp_conntrack_names[cur_state]);
		return cur_state;
285
286
	}

287
288
289
	pr_debug("dir: %d   cur_state: %s  chunk_type: %d  new_state: %s\n",
		 dir, sctp_conntrack_names[cur_state], chunk_type,
		 sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
290
291
292
293
294

	return sctp_conntracks[dir][i][cur_state];
}

/* Returns verdict for packet, or -1 for invalid. */
295
static int sctp_packet(struct nf_conn *ct,
296
297
298
299
300
301
302
		       const struct sk_buff *skb,
		       unsigned int dataoff,
		       enum ip_conntrack_info ctinfo,
		       int pf,
		       unsigned int hooknum)
{
	enum sctp_conntrack newconntrack, oldsctpstate;
303
	enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
304
305
306
	sctp_sctphdr_t _sctph, *sh;
	sctp_chunkhdr_t _sch, *sch;
	u_int32_t offset, count;
307
	unsigned long map[256 / sizeof(unsigned long)] = { 0 };
308
309
310
311
312

	sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
	if (sh == NULL)
		return -1;

313
	if (do_basic_checks(ct, skb, dataoff, map) != 0)
314
315
316
		return -1;

	/* Check the verification tag (Sec 8.5) */
317
318
319
320
321
	if (!test_bit(SCTP_CID_INIT, map) &&
	    !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
	    !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
	    !test_bit(SCTP_CID_ABORT, map) &&
	    !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
322
	    sh->vtag != ct->proto.sctp.vtag[dir]) {
323
		pr_debug("Verification tag check failed\n");
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
		return -1;
	}

	oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
	for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
		write_lock_bh(&sctp_lock);

		/* Special cases of Verification tag check (Sec 8.5.1) */
		if (sch->type == SCTP_CID_INIT) {
			/* Sec 8.5.1 (A) */
			if (sh->vtag != 0) {
				write_unlock_bh(&sctp_lock);
				return -1;
			}
		} else if (sch->type == SCTP_CID_ABORT) {
			/* Sec 8.5.1 (B) */
340
341
			if (sh->vtag != ct->proto.sctp.vtag[dir] &&
			    sh->vtag != ct->proto.sctp.vtag[!dir]) {
342
343
344
345
346
				write_unlock_bh(&sctp_lock);
				return -1;
			}
		} else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
			/* Sec 8.5.1 (C) */
347
348
			if (sh->vtag != ct->proto.sctp.vtag[dir] &&
			    sh->vtag != ct->proto.sctp.vtag[!dir] &&
349
			    (sch->flags & 1)) {
350
351
352
353
354
				write_unlock_bh(&sctp_lock);
				return -1;
			}
		} else if (sch->type == SCTP_CID_COOKIE_ECHO) {
			/* Sec 8.5.1 (D) */
355
			if (sh->vtag != ct->proto.sctp.vtag[dir]) {
356
357
358
359
360
				write_unlock_bh(&sctp_lock);
				return -1;
			}
		}

361
		oldsctpstate = ct->proto.sctp.state;
362
		newconntrack = new_state(dir, oldsctpstate, sch->type);
363
364
365

		/* Invalid */
		if (newconntrack == SCTP_CONNTRACK_MAX) {
366
367
			pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
				 "conntrack=%u\n",
368
				 dir, sch->type, oldsctpstate);
369
370
371
372
373
			write_unlock_bh(&sctp_lock);
			return -1;
		}

		/* If it is an INIT or an INIT ACK note down the vtag */
374
375
		if (sch->type == SCTP_CID_INIT ||
		    sch->type == SCTP_CID_INIT_ACK) {
376
377
378
			sctp_inithdr_t _inithdr, *ih;

			ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
379
						sizeof(_inithdr), &_inithdr);
380
			if (ih == NULL) {
381
382
				write_unlock_bh(&sctp_lock);
				return -1;
383
			}
384
			pr_debug("Setting vtag %x for dir %d\n",
385
386
				 ih->init_tag, !dir);
			ct->proto.sctp.vtag[!dir] = ih->init_tag;
387
388
		}

389
		ct->proto.sctp.state = newconntrack;
390
391
392
393
394
		if (oldsctpstate != newconntrack)
			nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
		write_unlock_bh(&sctp_lock);
	}

395
	nf_ct_refresh_acct(ct, ctinfo, skb, *sctp_timeouts[newconntrack]);
396

397
	if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED &&
398
	    dir == IP_CT_DIR_REPLY &&
399
	    newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
400
		pr_debug("Setting assured bit\n");
401
		set_bit(IPS_ASSURED_BIT, &ct->status);
402
403
404
405
406
407
408
		nf_conntrack_event_cache(IPCT_STATUS, skb);
	}

	return NF_ACCEPT;
}

/* Called when a new connection for this protocol found. */
409
static int sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
410
411
412
413
414
415
		    unsigned int dataoff)
{
	enum sctp_conntrack newconntrack;
	sctp_sctphdr_t _sctph, *sh;
	sctp_chunkhdr_t _sch, *sch;
	u_int32_t offset, count;
416
	unsigned long map[256 / sizeof(unsigned long)] = { 0 };
417
418
419
420
421

	sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
	if (sh == NULL)
		return 0;

422
	if (do_basic_checks(ct, skb, dataoff, map) != 0)
423
424
425
		return 0;

	/* If an OOTB packet has any of these chunks discard (Sec 8.4) */
426
427
428
	if (test_bit(SCTP_CID_ABORT, map) ||
	    test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
	    test_bit(SCTP_CID_COOKIE_ACK, map))
429
430
431
432
433
		return 0;

	newconntrack = SCTP_CONNTRACK_MAX;
	for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
		/* Don't need lock here: this conntrack not in circulation yet */
434
		newconntrack = new_state(IP_CT_DIR_ORIGINAL,
435
436
437
					 SCTP_CONNTRACK_NONE, sch->type);

		/* Invalid: delete conntrack */
438
439
		if (newconntrack == SCTP_CONNTRACK_NONE ||
		    newconntrack == SCTP_CONNTRACK_MAX) {
440
			pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
441
442
443
444
445
446
447
448
449
			return 0;
		}

		/* Copy the vtag into the state info */
		if (sch->type == SCTP_CID_INIT) {
			if (sh->vtag == 0) {
				sctp_inithdr_t _inithdr, *ih;

				ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
450
							sizeof(_inithdr), &_inithdr);
451
452
453
				if (ih == NULL)
					return 0;

454
455
				pr_debug("Setting vtag %x for new conn\n",
					 ih->init_tag);
456

457
				ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
458
459
460
461
462
463
464
465
466
								ih->init_tag;
			} else {
				/* Sec 8.5.1 (A) */
				return 0;
			}
		}
		/* If it is a shutdown ack OOTB packet, we expect a return
		   shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
		else {
467
468
			pr_debug("Setting vtag %x for new conn OOTB\n",
				 sh->vtag);
469
			ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
470
471
		}

472
		ct->proto.sctp.state = newconntrack;
473
474
475
476
477
478
	}

	return 1;
}

#ifdef CONFIG_SYSCTL
479
480
481
static unsigned int sctp_sysctl_table_users;
static struct ctl_table_header *sctp_sysctl_header;
static struct ctl_table sctp_sysctl_table[] = {
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
	{
		.procname	= "nf_conntrack_sctp_timeout_closed",
		.data		= &nf_ct_sctp_timeout_closed,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_cookie_wait",
		.data		= &nf_ct_sctp_timeout_cookie_wait,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_cookie_echoed",
		.data		= &nf_ct_sctp_timeout_cookie_echoed,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_established",
		.data		= &nf_ct_sctp_timeout_established,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_shutdown_sent",
		.data		= &nf_ct_sctp_timeout_shutdown_sent,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_shutdown_recd",
		.data		= &nf_ct_sctp_timeout_shutdown_recd,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "nf_conntrack_sctp_timeout_shutdown_ack_sent",
		.data		= &nf_ct_sctp_timeout_shutdown_ack_sent,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
532
533
		.ctl_name = 0
	}
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

#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
static struct ctl_table sctp_compat_sysctl_table[] = {
	{
		.procname	= "ip_conntrack_sctp_timeout_closed",
		.data		= &nf_ct_sctp_timeout_closed,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_cookie_wait",
		.data		= &nf_ct_sctp_timeout_cookie_wait,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_cookie_echoed",
		.data		= &nf_ct_sctp_timeout_cookie_echoed,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_established",
		.data		= &nf_ct_sctp_timeout_established,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_shutdown_sent",
		.data		= &nf_ct_sctp_timeout_shutdown_sent,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_shutdown_recd",
		.data		= &nf_ct_sctp_timeout_shutdown_recd,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.procname	= "ip_conntrack_sctp_timeout_shutdown_ack_sent",
		.data		= &nf_ct_sctp_timeout_shutdown_ack_sent,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= &proc_dointvec_jiffies,
	},
	{
		.ctl_name = 0
	}
};
#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
592
#endif
593

594
static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
595
596
597
598
599
600
601
602
603
604
	.l3proto		= PF_INET,
	.l4proto 		= IPPROTO_SCTP,
	.name 			= "sctp",
	.pkt_to_tuple 		= sctp_pkt_to_tuple,
	.invert_tuple 		= sctp_invert_tuple,
	.print_tuple 		= sctp_print_tuple,
	.print_conntrack	= sctp_print_conntrack,
	.packet 		= sctp_packet,
	.new 			= sctp_new,
	.me 			= THIS_MODULE,
605
606
607
608
609
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
	.nla_policy		= nf_ct_port_nla_policy,
#endif
610
611
612
613
#ifdef CONFIG_SYSCTL
	.ctl_table_users	= &sctp_sysctl_table_users,
	.ctl_table_header	= &sctp_sysctl_header,
	.ctl_table		= sctp_sysctl_table,
614
615
616
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	.ctl_compat_table	= sctp_compat_sysctl_table,
#endif
617
#endif
618
619
};

620
static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
621
622
623
624
625
626
627
628
629
630
	.l3proto		= PF_INET6,
	.l4proto 		= IPPROTO_SCTP,
	.name 			= "sctp",
	.pkt_to_tuple 		= sctp_pkt_to_tuple,
	.invert_tuple 		= sctp_invert_tuple,
	.print_tuple 		= sctp_print_tuple,
	.print_conntrack	= sctp_print_conntrack,
	.packet 		= sctp_packet,
	.new 			= sctp_new,
	.me 			= THIS_MODULE,
631
632
633
634
635
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
	.tuple_to_nlattr	= nf_ct_port_tuple_to_nlattr,
	.nlattr_to_tuple	= nf_ct_port_nlattr_to_tuple,
	.nla_policy		= nf_ct_port_nla_policy,
#endif
636
637
638
639
#ifdef CONFIG_SYSCTL
	.ctl_table_users	= &sctp_sysctl_table_users,
	.ctl_table_header	= &sctp_sysctl_header,
	.ctl_table		= sctp_sysctl_table,
640
#endif
641
};
642

643
int __init nf_conntrack_proto_sctp_init(void)
644
645
646
{
	int ret;

647
	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
648
	if (ret) {
649
		printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
650
651
		goto out;
	}
652
	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
653
	if (ret) {
654
		printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
655
656
657
658
659
660
		goto cleanup_sctp4;
	}

	return ret;

 cleanup_sctp4:
661
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
662
663
664
665
 out:
	return ret;
}

666
void __exit nf_conntrack_proto_sctp_fini(void)
667
{
668
669
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
670
671
}

672
673
module_init(nf_conntrack_proto_sctp_init);
module_exit(nf_conntrack_proto_sctp_fini);
674
675
676
677

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kiran Kumar Immidi");
MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
678
MODULE_ALIAS("ip_conntrack_proto_sctp");