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[NETFILTER]: nf_conntrack_expect: support inactive expectations
[deliverable/linux.git] / net / netfilter / nf_conntrack_h323_main.c
CommitLineData
f587de0e
PM		 1/*
2 * H.323 connection tracking helper
3 *
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
5 *
6 * This source code is licensed under General Public License version 2.
7 *
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
10 *
11 * For more information, please see http://nath323.sourceforge.net/
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/ctype.h>
17#include <linux/inet.h>
18#include <linux/in.h>
19#include <linux/ip.h>
20#include <linux/udp.h>
21#include <linux/tcp.h>
22#include <linux/skbuff.h>
23#include <net/route.h>
24#include <net/ip6_route.h>
25
26#include <net/netfilter/nf_conntrack.h>
27#include <net/netfilter/nf_conntrack_core.h>
28#include <net/netfilter/nf_conntrack_tuple.h>
29#include <net/netfilter/nf_conntrack_expect.h>
30#include <net/netfilter/nf_conntrack_ecache.h>
31#include <net/netfilter/nf_conntrack_helper.h>
32#include <linux/netfilter/nf_conntrack_h323.h>
33
f587de0e
PM		 34/* Parameters */
35static unsigned int default_rrq_ttl __read_mostly = 300;
36module_param(default_rrq_ttl, uint, 0600);
37MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
38
39static int gkrouted_only __read_mostly = 1;
40module_param(gkrouted_only, int, 0600);
41MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
42
43static int callforward_filter __read_mostly = 1;
44module_param(callforward_filter, bool, 0600);
45MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
601e68e1 46 "if both endpoints are on different sides "
f587de0e
PM		 47 "(determined by routing information)");
48
49/* Hooks for NAT */
3db05fea 50int (*set_h245_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 51 unsigned char **data, int dataoff,
52 H245_TransportAddress *taddr,
643a2c15 53 union nf_inet_addr *addr, __be16 port)
f587de0e 54 __read_mostly;
3db05fea 55int (*set_h225_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 56 unsigned char **data, int dataoff,
57 TransportAddress *taddr,
643a2c15 58 union nf_inet_addr *addr, __be16 port)
f587de0e 59 __read_mostly;
3db05fea 60int (*set_sig_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 61 struct nf_conn *ct,
62 enum ip_conntrack_info ctinfo,
63 unsigned char **data,
64 TransportAddress *taddr, int count) __read_mostly;
3db05fea 65int (*set_ras_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 66 struct nf_conn *ct,
67 enum ip_conntrack_info ctinfo,
68 unsigned char **data,
69 TransportAddress *taddr, int count) __read_mostly;
3db05fea 70int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
f587de0e
PM		 71 struct nf_conn *ct,
72 enum ip_conntrack_info ctinfo,
73 unsigned char **data, int dataoff,
74 H245_TransportAddress *taddr,
75 __be16 port, __be16 rtp_port,
76 struct nf_conntrack_expect *rtp_exp,
77 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
3db05fea 78int (*nat_t120_hook) (struct sk_buff *skb,
f587de0e
PM		 79 struct nf_conn *ct,
80 enum ip_conntrack_info ctinfo,
81 unsigned char **data, int dataoff,
82 H245_TransportAddress *taddr, __be16 port,
83 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 84int (*nat_h245_hook) (struct sk_buff *skb,
f587de0e
PM		 85 struct nf_conn *ct,
86 enum ip_conntrack_info ctinfo,
87 unsigned char **data, int dataoff,
88 TransportAddress *taddr, __be16 port,
89 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 90int (*nat_callforwarding_hook) (struct sk_buff *skb,
f587de0e
PM		 91 struct nf_conn *ct,
92 enum ip_conntrack_info ctinfo,
93 unsigned char **data, int dataoff,
94 TransportAddress *taddr, __be16 port,
95 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 96int (*nat_q931_hook) (struct sk_buff *skb,
f587de0e
PM		 97 struct nf_conn *ct,
98 enum ip_conntrack_info ctinfo,
99 unsigned char **data, TransportAddress *taddr, int idx,
100 __be16 port, struct nf_conntrack_expect *exp)
101 __read_mostly;
102
103static DEFINE_SPINLOCK(nf_h323_lock);
104static char *h323_buffer;
105
106static struct nf_conntrack_helper nf_conntrack_helper_h245;
107static struct nf_conntrack_helper nf_conntrack_helper_q931[];
108static struct nf_conntrack_helper nf_conntrack_helper_ras[];
109
110/****************************************************************************/
3db05fea 111static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 112 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
113 unsigned char **data, int *datalen, int *dataoff)
114{
115 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
116 int dir = CTINFO2DIR(ctinfo);
905e3e8e
JE		 117 const struct tcphdr *th;
118 struct tcphdr _tcph;
f587de0e
PM		 119 int tcpdatalen;
120 int tcpdataoff;
121 unsigned char *tpkt;
122 int tpktlen;
123 int tpktoff;
124
125 /* Get TCP header */
3db05fea 126 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
f587de0e
PM		 127 if (th == NULL)
128 return 0;
129
130 /* Get TCP data offset */
131 tcpdataoff = protoff + th->doff * 4;
132
133 /* Get TCP data length */
3db05fea 134 tcpdatalen = skb->len - tcpdataoff;
f587de0e
PM		 135 if (tcpdatalen <= 0) /* No TCP data */
136 goto clear_out;
137
138 if (*data == NULL) { /* first TPKT */
139 /* Get first TPKT pointer */
3db05fea 140 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
f587de0e
PM		 141 h323_buffer);
142 BUG_ON(tpkt == NULL);
143
144 /* Validate TPKT identifier */
145 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
146 /* Netmeeting sends TPKT header and data separately */
147 if (info->tpkt_len[dir] > 0) {
0d53778e
PM		 148 pr_debug("nf_ct_h323: previous packet "
149 "indicated separate TPKT data of %hu "
150 "bytes\n", info->tpkt_len[dir]);
f587de0e
PM		 151 if (info->tpkt_len[dir] <= tcpdatalen) {
152 /* Yes, there was a TPKT header
153 * received */
154 *data = tpkt;
155 *datalen = info->tpkt_len[dir];
156 *dataoff = 0;
157 goto out;
158 }
159
160 /* Fragmented TPKT */
0d53778e 161 pr_debug("nf_ct_h323: fragmented TPKT\n");
f587de0e
PM		 162 goto clear_out;
163 }
164
165 /* It is not even a TPKT */
166 return 0;
167 }
168 tpktoff = 0;
169 } else { /* Next TPKT */
170 tpktoff = *dataoff + *datalen;
171 tcpdatalen -= tpktoff;
172 if (tcpdatalen <= 4) /* No more TPKT */
173 goto clear_out;
174 tpkt = *data + *datalen;
175
176 /* Validate TPKT identifier */
177 if (tpkt[0] != 0x03 || tpkt[1] != 0)
178 goto clear_out;
179 }
180
181 /* Validate TPKT length */
182 tpktlen = tpkt[2] * 256 + tpkt[3];
183 if (tpktlen < 4)
184 goto clear_out;
185 if (tpktlen > tcpdatalen) {
186 if (tcpdatalen == 4) { /* Separate TPKT header */
187 /* Netmeeting sends TPKT header and data separately */
0d53778e
PM		 188 pr_debug("nf_ct_h323: separate TPKT header indicates "
189 "there will be TPKT data of %hu bytes\n",
190 tpktlen - 4);
f587de0e
PM		 191 info->tpkt_len[dir] = tpktlen - 4;
192 return 0;
193 }
194
195 if (net_ratelimit())
196 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
197 goto clear_out;
198 }
199
200 /* This is the encapsulated data */
201 *data = tpkt + 4;
202 *datalen = tpktlen - 4;
203 *dataoff = tpktoff + 4;
204
205 out:
206 /* Clear TPKT length */
207 info->tpkt_len[dir] = 0;
208 return 1;
209
210 clear_out:
211 info->tpkt_len[dir] = 0;
212 return 0;
213}
214
215/****************************************************************************/
905e3e8e 216static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
f587de0e 217 H245_TransportAddress *taddr,
643a2c15 218 union nf_inet_addr *addr, __be16 *port)
f587de0e 219{
905e3e8e 220 const unsigned char *p;
f587de0e
PM		 221 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
222 int len;
223
224 if (taddr->choice != eH245_TransportAddress_unicastAddress)
225 return 0;
226
227 switch (taddr->unicastAddress.choice) {
228 case eUnicastAddress_iPAddress:
229 if (family != AF_INET)
230 return 0;
231 p = data + taddr->unicastAddress.iPAddress.network;
232 len = 4;
233 break;
234 case eUnicastAddress_iP6Address:
235 if (family != AF_INET6)
236 return 0;
237 p = data + taddr->unicastAddress.iP6Address.network;
238 len = 16;
239 break;
240 default:
241 return 0;
242 }
243
244 memcpy(addr, p, len);
245 memset((void *)addr + len, 0, sizeof(*addr) - len);
246 memcpy(port, p + len, sizeof(__be16));
247
248 return 1;
249}
250
251/****************************************************************************/
3db05fea 252static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 253 enum ip_conntrack_info ctinfo,
254 unsigned char **data, int dataoff,
255 H245_TransportAddress *taddr)
256{
257 int dir = CTINFO2DIR(ctinfo);
258 int ret = 0;
259 __be16 port;
260 __be16 rtp_port, rtcp_port;
643a2c15 261 union nf_inet_addr addr;
f587de0e
PM		 262 struct nf_conntrack_expect *rtp_exp;
263 struct nf_conntrack_expect *rtcp_exp;
264 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
265
266 /* Read RTP or RTCP address */
267 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
268 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
269 port == 0)
270 return 0;
271
272 /* RTP port is even */
273 port &= htons(~1);
274 rtp_port = port;
275 rtcp_port = htons(ntohs(port) + 1);
276
277 /* Create expect for RTP */
6823645d 278 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 279 return -1;
6823645d
PM		 280 nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
281 &ct->tuplehash[!dir].tuple.src.u3,
282 &ct->tuplehash[!dir].tuple.dst.u3,
283 IPPROTO_UDP, NULL, &rtp_port);
f587de0e
PM		 284
285 /* Create expect for RTCP */
6823645d
PM		 286 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
287 nf_ct_expect_put(rtp_exp);
f587de0e
PM		 288 return -1;
289 }
6823645d
PM		 290 nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
291 &ct->tuplehash[!dir].tuple.src.u3,
292 &ct->tuplehash[!dir].tuple.dst.u3,
293 IPPROTO_UDP, NULL, &rtcp_port);
f587de0e
PM		 294
295 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
601e68e1 296 &ct->tuplehash[!dir].tuple.dst.u3,
f587de0e
PM		 297 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
298 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
299 ct->status & IPS_NAT_MASK) {
300 /* NAT needed */
3db05fea 301 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 302 taddr, port, rtp_port, rtp_exp, rtcp_exp);
303 } else { /* Conntrack only */
6823645d
PM		 304 if (nf_ct_expect_related(rtp_exp) == 0) {
305 if (nf_ct_expect_related(rtcp_exp) == 0) {
0d53778e 306 pr_debug("nf_ct_h323: expect RTP ");
f587de0e 307 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
0d53778e 308 pr_debug("nf_ct_h323: expect RTCP ");
f587de0e
PM		 309 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
310 } else {
6823645d 311 nf_ct_unexpect_related(rtp_exp);
f587de0e
PM		 312 ret = -1;
313 }
314 } else
315 ret = -1;
316 }
317
6823645d
PM		 318 nf_ct_expect_put(rtp_exp);
319 nf_ct_expect_put(rtcp_exp);
f587de0e
PM		 320
321 return ret;
322}
323
324/****************************************************************************/
3db05fea 325static int expect_t120(struct sk_buff *skb,
f587de0e
PM		 326 struct nf_conn *ct,
327 enum ip_conntrack_info ctinfo,
328 unsigned char **data, int dataoff,
329 H245_TransportAddress *taddr)
330{
331 int dir = CTINFO2DIR(ctinfo);
332 int ret = 0;
333 __be16 port;
643a2c15 334 union nf_inet_addr addr;
f587de0e
PM		 335 struct nf_conntrack_expect *exp;
336 typeof(nat_t120_hook) nat_t120;
337
338 /* Read T.120 address */
339 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
340 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
341 port == 0)
342 return 0;
343
344 /* Create expect for T.120 connections */
6823645d 345 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 346 return -1;
6823645d
PM		 347 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
348 &ct->tuplehash[!dir].tuple.src.u3,
349 &ct->tuplehash[!dir].tuple.dst.u3,
350 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 351 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
352
353 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
354 &ct->tuplehash[!dir].tuple.dst.u3,
355 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
356 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
357 ct->status & IPS_NAT_MASK) {
358 /* NAT needed */
3db05fea 359 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 360 port, exp);
361 } else { /* Conntrack only */
6823645d 362 if (nf_ct_expect_related(exp) == 0) {
0d53778e 363 pr_debug("nf_ct_h323: expect T.120 ");
f587de0e
PM		 364 NF_CT_DUMP_TUPLE(&exp->tuple);
365 } else
366 ret = -1;
367 }
368
6823645d 369 nf_ct_expect_put(exp);
f587de0e
PM		 370
371 return ret;
372}
373
374/****************************************************************************/
3db05fea 375static int process_h245_channel(struct sk_buff *skb,
f587de0e
PM		 376 struct nf_conn *ct,
377 enum ip_conntrack_info ctinfo,
378 unsigned char **data, int dataoff,
379 H2250LogicalChannelParameters *channel)
380{
381 int ret;
382
383 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
384 /* RTP */
3db05fea 385 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 386 &channel->mediaChannel);
387 if (ret < 0)
388 return -1;
389 }
390
391 if (channel->
392 options & eH2250LogicalChannelParameters_mediaControlChannel) {
393 /* RTCP */
3db05fea 394 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 395 &channel->mediaControlChannel);
396 if (ret < 0)
397 return -1;
398 }
399
400 return 0;
401}
402
403/****************************************************************************/
3db05fea 404static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 405 enum ip_conntrack_info ctinfo,
406 unsigned char **data, int dataoff,
407 OpenLogicalChannel *olc)
408{
409 int ret;
410
0d53778e 411 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
f587de0e
PM		 412
413 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
414 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
415 {
3db05fea 416 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 417 &olc->
418 forwardLogicalChannelParameters.
419 multiplexParameters.
420 h2250LogicalChannelParameters);
421 if (ret < 0)
422 return -1;
423 }
424
425 if ((olc->options &
426 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
427 (olc->reverseLogicalChannelParameters.options &
428 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
429 && (olc->reverseLogicalChannelParameters.multiplexParameters.
430 choice ==
431 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
432 {
433 ret =
3db05fea 434 process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 435 &olc->
436 reverseLogicalChannelParameters.
437 multiplexParameters.
438 h2250LogicalChannelParameters);
439 if (ret < 0)
440 return -1;
441 }
442
443 if ((olc->options & eOpenLogicalChannel_separateStack) &&
444 olc->forwardLogicalChannelParameters.dataType.choice ==
445 eDataType_data &&
446 olc->forwardLogicalChannelParameters.dataType.data.application.
447 choice == eDataApplicationCapability_application_t120 &&
448 olc->forwardLogicalChannelParameters.dataType.data.application.
449 t120.choice == eDataProtocolCapability_separateLANStack &&
450 olc->separateStack.networkAddress.choice ==
451 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 452 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 453 &olc->separateStack.networkAddress.
454 localAreaAddress);
455 if (ret < 0)
456 return -1;
457 }
458
459 return 0;
460}
461
462/****************************************************************************/
3db05fea 463static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 464 enum ip_conntrack_info ctinfo,
465 unsigned char **data, int dataoff,
466 OpenLogicalChannelAck *olca)
467{
468 H2250LogicalChannelAckParameters *ack;
469 int ret;
470
0d53778e 471 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
f587de0e
PM		 472
473 if ((olca->options &
474 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
475 (olca->reverseLogicalChannelParameters.options &
476 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
477 && (olca->reverseLogicalChannelParameters.multiplexParameters.
478 choice ==
479 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
480 {
3db05fea 481 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 482 &olca->
483 reverseLogicalChannelParameters.
484 multiplexParameters.
485 h2250LogicalChannelParameters);
486 if (ret < 0)
487 return -1;
488 }
489
490 if ((olca->options &
491 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
492 (olca->forwardMultiplexAckParameters.choice ==
493 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
494 {
495 ack = &olca->forwardMultiplexAckParameters.
496 h2250LogicalChannelAckParameters;
497 if (ack->options &
498 eH2250LogicalChannelAckParameters_mediaChannel) {
499 /* RTP */
3db05fea 500 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 501 &ack->mediaChannel);
502 if (ret < 0)
503 return -1;
504 }
505
506 if (ack->options &
507 eH2250LogicalChannelAckParameters_mediaControlChannel) {
508 /* RTCP */
3db05fea 509 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 510 &ack->mediaControlChannel);
511 if (ret < 0)
512 return -1;
513 }
514 }
515
f8f1c08e
JMZ		 516 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
517 olca->separateStack.networkAddress.choice ==
518 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 519 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f8f1c08e
JMZ		 520 &olca->separateStack.networkAddress.
521 localAreaAddress);
522 if (ret < 0)
523 return -1;
524 }
525
f587de0e
PM		 526 return 0;
527}
528
529/****************************************************************************/
3db05fea 530static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 531 enum ip_conntrack_info ctinfo,
532 unsigned char **data, int dataoff,
533 MultimediaSystemControlMessage *mscm)
534{
535 switch (mscm->choice) {
536 case eMultimediaSystemControlMessage_request:
537 if (mscm->request.choice ==
538 eRequestMessage_openLogicalChannel) {
3db05fea 539 return process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 540 &mscm->request.openLogicalChannel);
541 }
0d53778e
PM		 542 pr_debug("nf_ct_h323: H.245 Request %d\n",
543 mscm->request.choice);
f587de0e
PM		 544 break;
545 case eMultimediaSystemControlMessage_response:
546 if (mscm->response.choice ==
547 eResponseMessage_openLogicalChannelAck) {
3db05fea 548 return process_olca(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 549 &mscm->response.
550 openLogicalChannelAck);
551 }
0d53778e
PM		 552 pr_debug("nf_ct_h323: H.245 Response %d\n",
553 mscm->response.choice);
f587de0e
PM		 554 break;
555 default:
0d53778e 556 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
f587de0e
PM		 557 break;
558 }
559
560 return 0;
561}
562
563/****************************************************************************/
3db05fea 564static int h245_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 565 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
566{
567 static MultimediaSystemControlMessage mscm;
568 unsigned char *data = NULL;
569 int datalen;
570 int dataoff;
571 int ret;
572
573 /* Until there's been traffic both ways, don't look in packets. */
574 if (ctinfo != IP_CT_ESTABLISHED &&
575 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
576 return NF_ACCEPT;
577 }
3db05fea 578 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
f587de0e
PM		 579
580 spin_lock_bh(&nf_h323_lock);
581
582 /* Process each TPKT */
3db05fea 583 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 584 &data, &datalen, &dataoff)) {
0d53778e 585 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
f587de0e
PM		 586 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
587
588 /* Decode H.245 signal */
589 ret = DecodeMultimediaSystemControlMessage(data, datalen,
590 &mscm);
591 if (ret < 0) {
0d53778e
PM		 592 pr_debug("nf_ct_h245: decoding error: %s\n",
593 ret == H323_ERROR_BOUND ?
594 "out of bound" : "out of range");
f587de0e
PM		 595 /* We don't drop when decoding error */
596 break;
597 }
598
599 /* Process H.245 signal */
3db05fea 600 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
f587de0e
PM		 601 goto drop;
602 }
603
604 spin_unlock_bh(&nf_h323_lock);
605 return NF_ACCEPT;
606
607 drop:
608 spin_unlock_bh(&nf_h323_lock);
609 if (net_ratelimit())
610 printk("nf_ct_h245: packet dropped\n");
611 return NF_DROP;
612}
613
614/****************************************************************************/
615static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
616 .name = "H.245",
617 .me = THIS_MODULE,
618 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
619 .timeout = 240,
620 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 621 .help = h245_help
622};
623
624/****************************************************************************/
625int get_h225_addr(struct nf_conn *ct, unsigned char *data,
626 TransportAddress *taddr,
643a2c15 627 union nf_inet_addr *addr, __be16 *port)
f587de0e 628{
905e3e8e 629 const unsigned char *p;
f587de0e
PM		 630 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
631 int len;
632
633 switch (taddr->choice) {
634 case eTransportAddress_ipAddress:
635 if (family != AF_INET)
636 return 0;
637 p = data + taddr->ipAddress.ip;
638 len = 4;
639 break;
640 case eTransportAddress_ip6Address:
641 if (family != AF_INET6)
642 return 0;
bb807245 643 p = data + taddr->ip6Address.ip;
f587de0e
PM		 644 len = 16;
645 break;
646 default:
647 return 0;
648 }
649
650 memcpy(addr, p, len);
651 memset((void *)addr + len, 0, sizeof(*addr) - len);
652 memcpy(port, p + len, sizeof(__be16));
653
654 return 1;
655}
656
657/****************************************************************************/
3db05fea 658static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 659 enum ip_conntrack_info ctinfo,
660 unsigned char **data, int dataoff,
661 TransportAddress *taddr)
662{
663 int dir = CTINFO2DIR(ctinfo);
664 int ret = 0;
665 __be16 port;
643a2c15 666 union nf_inet_addr addr;
f587de0e
PM		 667 struct nf_conntrack_expect *exp;
668 typeof(nat_h245_hook) nat_h245;
669
670 /* Read h245Address */
671 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
672 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
673 port == 0)
674 return 0;
675
676 /* Create expect for h245 connection */
6823645d 677 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 678 return -1;
6823645d
PM		 679 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
680 &ct->tuplehash[!dir].tuple.src.u3,
681 &ct->tuplehash[!dir].tuple.dst.u3,
682 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 683 exp->helper = &nf_conntrack_helper_h245;
684
685 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
686 &ct->tuplehash[!dir].tuple.dst.u3,
687 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
688 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
689 ct->status & IPS_NAT_MASK) {
690 /* NAT needed */
3db05fea 691 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 692 port, exp);
693 } else { /* Conntrack only */
6823645d 694 if (nf_ct_expect_related(exp) == 0) {
0d53778e 695 pr_debug("nf_ct_q931: expect H.245 ");
f587de0e
PM		 696 NF_CT_DUMP_TUPLE(&exp->tuple);
697 } else
698 ret = -1;
699 }
700
6823645d 701 nf_ct_expect_put(exp);
f587de0e
PM		 702
703 return ret;
704}
705
706/* If the calling party is on the same side of the forward-to party,
707 * we don't need to track the second call */
905e3e8e
JE		 708static int callforward_do_filter(const union nf_inet_addr *src,
709 const union nf_inet_addr *dst, int family)
f587de0e 710{
1e796fda 711 const struct nf_afinfo *afinfo;
f587de0e
PM		 712 struct flowi fl1, fl2;
713 int ret = 0;
714
1841a4c7
PM		 715 /* rcu_read_lock()ed by nf_hook_slow() */
716 afinfo = nf_get_afinfo(family);
717 if (!afinfo)
718 return 0;
719
f587de0e
PM		 720 memset(&fl1, 0, sizeof(fl1));
721 memset(&fl2, 0, sizeof(fl2));
722
723 switch (family) {
724 case AF_INET: {
725 struct rtable *rt1, *rt2;
726
727 fl1.fl4_dst = src->ip;
728 fl2.fl4_dst = dst->ip;
1841a4c7
PM		 729 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
730 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
f587de0e
PM		 731 if (rt1->rt_gateway == rt2->rt_gateway &&
732 rt1->u.dst.dev == rt2->u.dst.dev)
733 ret = 1;
734 dst_release(&rt2->u.dst);
735 }
736 dst_release(&rt1->u.dst);
737 }
738 break;
739 }
1841a4c7
PM		 740#if defined(CONFIG_NF_CONNTRACK_IPV6) || \
741 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
f587de0e
PM		 742 case AF_INET6: {
743 struct rt6_info *rt1, *rt2;
744
745 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
746 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
1841a4c7
PM		 747 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
748 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
f587de0e 749 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
601e68e1 750 sizeof(rt1->rt6i_gateway)) &&
f587de0e
PM		 751 rt1->u.dst.dev == rt2->u.dst.dev)
752 ret = 1;
753 dst_release(&rt2->u.dst);
754 }
755 dst_release(&rt1->u.dst);
756 }
757 break;
758 }
759#endif
760 }
761 return ret;
762
763}
764
765/****************************************************************************/
3db05fea 766static int expect_callforwarding(struct sk_buff *skb,
f587de0e
PM		 767 struct nf_conn *ct,
768 enum ip_conntrack_info ctinfo,
769 unsigned char **data, int dataoff,
770 TransportAddress *taddr)
771{
772 int dir = CTINFO2DIR(ctinfo);
773 int ret = 0;
774 __be16 port;
643a2c15 775 union nf_inet_addr addr;
f587de0e
PM		 776 struct nf_conntrack_expect *exp;
777 typeof(nat_callforwarding_hook) nat_callforwarding;
778
779 /* Read alternativeAddress */
780 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
781 return 0;
782
783 /* If the calling party is on the same side of the forward-to party,
784 * we don't need to track the second call */
785 if (callforward_filter &&
786 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
601e68e1 787 ct->tuplehash[!dir].tuple.src.l3num)) {
0d53778e 788 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
f587de0e
PM		 789 return 0;
790 }
791
792 /* Create expect for the second call leg */
6823645d 793 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 794 return -1;
6823645d
PM		 795 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
796 &ct->tuplehash[!dir].tuple.src.u3, &addr,
797 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 798 exp->helper = nf_conntrack_helper_q931;
799
800 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
801 &ct->tuplehash[!dir].tuple.dst.u3,
802 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
803 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
804 ct->status & IPS_NAT_MASK) {
805 /* Need NAT */
3db05fea 806 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 807 taddr, port, exp);
808 } else { /* Conntrack only */
6823645d 809 if (nf_ct_expect_related(exp) == 0) {
0d53778e 810 pr_debug("nf_ct_q931: expect Call Forwarding ");
f587de0e
PM		 811 NF_CT_DUMP_TUPLE(&exp->tuple);
812 } else
813 ret = -1;
814 }
815
6823645d 816 nf_ct_expect_put(exp);
f587de0e
PM		 817
818 return ret;
819}
820
821/****************************************************************************/
3db05fea 822static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 823 enum ip_conntrack_info ctinfo,
824 unsigned char **data, int dataoff,
825 Setup_UUIE *setup)
826{
827 int dir = CTINFO2DIR(ctinfo);
828 int ret;
829 int i;
830 __be16 port;
643a2c15 831 union nf_inet_addr addr;
f587de0e
PM		 832 typeof(set_h225_addr_hook) set_h225_addr;
833
0d53778e 834 pr_debug("nf_ct_q931: Setup\n");
f587de0e
PM		 835
836 if (setup->options & eSetup_UUIE_h245Address) {
3db05fea 837 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 838 &setup->h245Address);
839 if (ret < 0)
840 return -1;
841 }
842
843 set_h225_addr = rcu_dereference(set_h225_addr_hook);
844 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
6aebb9b2 845 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
f587de0e 846 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
601e68e1 847 &addr, &port) &&
f587de0e 848 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
0d53778e
PM		 849 pr_debug("nf_ct_q931: set destCallSignalAddress "
850 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
851 NIP6(*(struct in6_addr *)&addr), ntohs(port),
852 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
853 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
3db05fea 854 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 855 &setup->destCallSignalAddress,
856 &ct->tuplehash[!dir].tuple.src.u3,
857 ct->tuplehash[!dir].tuple.src.u.tcp.port);
858 if (ret < 0)
859 return -1;
860 }
861
862 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
863 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
864 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
601e68e1 865 &addr, &port) &&
f587de0e 866 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
0d53778e
PM		 867 pr_debug("nf_ct_q931: set sourceCallSignalAddress "
868 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
869 NIP6(*(struct in6_addr *)&addr), ntohs(port),
870 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
871 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
3db05fea 872 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 873 &setup->sourceCallSignalAddress,
874 &ct->tuplehash[!dir].tuple.dst.u3,
875 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
876 if (ret < 0)
877 return -1;
878 }
879
880 if (setup->options & eSetup_UUIE_fastStart) {
881 for (i = 0; i < setup->fastStart.count; i++) {
3db05fea 882 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 883 &setup->fastStart.item[i]);
884 if (ret < 0)
885 return -1;
886 }
887 }
888
889 return 0;
890}
891
892/****************************************************************************/
3db05fea 893static int process_callproceeding(struct sk_buff *skb,
f587de0e
PM		 894 struct nf_conn *ct,
895 enum ip_conntrack_info ctinfo,
896 unsigned char **data, int dataoff,
897 CallProceeding_UUIE *callproc)
898{
899 int ret;
900 int i;
901
0d53778e 902 pr_debug("nf_ct_q931: CallProceeding\n");
f587de0e
PM		 903
904 if (callproc->options & eCallProceeding_UUIE_h245Address) {
3db05fea 905 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 906 &callproc->h245Address);
907 if (ret < 0)
908 return -1;
909 }
910
911 if (callproc->options & eCallProceeding_UUIE_fastStart) {
912 for (i = 0; i < callproc->fastStart.count; i++) {
3db05fea 913 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 914 &callproc->fastStart.item[i]);
915 if (ret < 0)
916 return -1;
917 }
918 }
919
920 return 0;
921}
922
923/****************************************************************************/
3db05fea 924static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 925 enum ip_conntrack_info ctinfo,
926 unsigned char **data, int dataoff,
927 Connect_UUIE *connect)
928{
929 int ret;
930 int i;
931
0d53778e 932 pr_debug("nf_ct_q931: Connect\n");
f587de0e
PM		 933
934 if (connect->options & eConnect_UUIE_h245Address) {
3db05fea 935 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 936 &connect->h245Address);
937 if (ret < 0)
938 return -1;
939 }
940
941 if (connect->options & eConnect_UUIE_fastStart) {
942 for (i = 0; i < connect->fastStart.count; i++) {
3db05fea 943 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 944 &connect->fastStart.item[i]);
945 if (ret < 0)
946 return -1;
947 }
948 }
949
950 return 0;
951}
952
953/****************************************************************************/
3db05fea 954static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 955 enum ip_conntrack_info ctinfo,
956 unsigned char **data, int dataoff,
957 Alerting_UUIE *alert)
958{
959 int ret;
960 int i;
961
0d53778e 962 pr_debug("nf_ct_q931: Alerting\n");
f587de0e
PM		 963
964 if (alert->options & eAlerting_UUIE_h245Address) {
3db05fea 965 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 966 &alert->h245Address);
967 if (ret < 0)
968 return -1;
969 }
970
971 if (alert->options & eAlerting_UUIE_fastStart) {
972 for (i = 0; i < alert->fastStart.count; i++) {
3db05fea 973 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 974 &alert->fastStart.item[i]);
975 if (ret < 0)
976 return -1;
977 }
978 }
979
980 return 0;
981}
982
f587de0e 983/****************************************************************************/
3db05fea 984static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 985 enum ip_conntrack_info ctinfo,
986 unsigned char **data, int dataoff,
987 Facility_UUIE *facility)
988{
989 int ret;
990 int i;
991
0d53778e 992 pr_debug("nf_ct_q931: Facility\n");
f587de0e
PM		 993
994 if (facility->reason.choice == eFacilityReason_callForwarded) {
995 if (facility->options & eFacility_UUIE_alternativeAddress)
3db05fea 996 return expect_callforwarding(skb, ct, ctinfo, data,
f587de0e
PM		 997 dataoff,
998 &facility->
999 alternativeAddress);
1000 return 0;
1001 }
1002
1003 if (facility->options & eFacility_UUIE_h245Address) {
3db05fea 1004 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1005 &facility->h245Address);
1006 if (ret < 0)
1007 return -1;
1008 }
1009
1010 if (facility->options & eFacility_UUIE_fastStart) {
1011 for (i = 0; i < facility->fastStart.count; i++) {
3db05fea 1012 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1013 &facility->fastStart.item[i]);
1014 if (ret < 0)
1015 return -1;
1016 }
1017 }
1018
1019 return 0;
1020}
1021
1022/****************************************************************************/
3db05fea 1023static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1024 enum ip_conntrack_info ctinfo,
1025 unsigned char **data, int dataoff,
1026 Progress_UUIE *progress)
1027{
1028 int ret;
1029 int i;
1030
0d53778e 1031 pr_debug("nf_ct_q931: Progress\n");
f587de0e
PM		 1032
1033 if (progress->options & eProgress_UUIE_h245Address) {
3db05fea 1034 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1035 &progress->h245Address);
1036 if (ret < 0)
1037 return -1;
1038 }
1039
1040 if (progress->options & eProgress_UUIE_fastStart) {
1041 for (i = 0; i < progress->fastStart.count; i++) {
3db05fea 1042 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1043 &progress->fastStart.item[i]);
1044 if (ret < 0)
1045 return -1;
1046 }
1047 }
1048
1049 return 0;
1050}
1051
1052/****************************************************************************/
3db05fea 1053static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1054 enum ip_conntrack_info ctinfo,
1055 unsigned char **data, int dataoff, Q931 *q931)
1056{
1057 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1058 int i;
1059 int ret = 0;
1060
1061 switch (pdu->h323_message_body.choice) {
1062 case eH323_UU_PDU_h323_message_body_setup:
3db05fea 1063 ret = process_setup(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1064 &pdu->h323_message_body.setup);
1065 break;
1066 case eH323_UU_PDU_h323_message_body_callProceeding:
3db05fea 1067 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1068 &pdu->h323_message_body.
1069 callProceeding);
1070 break;
1071 case eH323_UU_PDU_h323_message_body_connect:
3db05fea 1072 ret = process_connect(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1073 &pdu->h323_message_body.connect);
1074 break;
1075 case eH323_UU_PDU_h323_message_body_alerting:
3db05fea 1076 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1077 &pdu->h323_message_body.alerting);
1078 break;
f587de0e 1079 case eH323_UU_PDU_h323_message_body_facility:
3db05fea 1080 ret = process_facility(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1081 &pdu->h323_message_body.facility);
1082 break;
1083 case eH323_UU_PDU_h323_message_body_progress:
3db05fea 1084 ret = process_progress(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1085 &pdu->h323_message_body.progress);
1086 break;
1087 default:
0d53778e
PM		 1088 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1089 pdu->h323_message_body.choice);
f587de0e
PM		 1090 break;
1091 }
1092
1093 if (ret < 0)
1094 return -1;
1095
1096 if (pdu->options & eH323_UU_PDU_h245Control) {
1097 for (i = 0; i < pdu->h245Control.count; i++) {
3db05fea 1098 ret = process_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1099 &pdu->h245Control.item[i]);
1100 if (ret < 0)
1101 return -1;
1102 }
1103 }
1104
1105 return 0;
1106}
1107
1108/****************************************************************************/
3db05fea 1109static int q931_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1110 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1111{
1112 static Q931 q931;
1113 unsigned char *data = NULL;
1114 int datalen;
1115 int dataoff;
1116 int ret;
1117
1118 /* Until there's been traffic both ways, don't look in packets. */
1119 if (ctinfo != IP_CT_ESTABLISHED &&
1120 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1121 return NF_ACCEPT;
1122 }
3db05fea 1123 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
f587de0e
PM		 1124
1125 spin_lock_bh(&nf_h323_lock);
1126
1127 /* Process each TPKT */
3db05fea 1128 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 1129 &data, &datalen, &dataoff)) {
0d53778e 1130 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
f587de0e
PM		 1131 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1132
1133 /* Decode Q.931 signal */
1134 ret = DecodeQ931(data, datalen, &q931);
1135 if (ret < 0) {
0d53778e
PM		 1136 pr_debug("nf_ct_q931: decoding error: %s\n",
1137 ret == H323_ERROR_BOUND ?
1138 "out of bound" : "out of range");
f587de0e
PM		 1139 /* We don't drop when decoding error */
1140 break;
1141 }
1142
1143 /* Process Q.931 signal */
3db05fea 1144 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
f587de0e
PM		 1145 goto drop;
1146 }
1147
1148 spin_unlock_bh(&nf_h323_lock);
1149 return NF_ACCEPT;
1150
1151 drop:
1152 spin_unlock_bh(&nf_h323_lock);
1153 if (net_ratelimit())
1154 printk("nf_ct_q931: packet dropped\n");
1155 return NF_DROP;
1156}
1157
1158/****************************************************************************/
1159static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1160 {
1161 .name = "Q.931",
1162 .me = THIS_MODULE,
1163 /* T.120 and H.245 */
1164 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1165 .timeout = 240,
1166 .tuple.src.l3num = AF_INET,
1167 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1168 .tuple.dst.protonum = IPPROTO_TCP,
f587de0e
PM		 1169 .help = q931_help
1170 },
1171 {
1172 .name = "Q.931",
1173 .me = THIS_MODULE,
1174 /* T.120 and H.245 */
1175 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1176 .timeout = 240,
1177 .tuple.src.l3num = AF_INET6,
1178 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1179 .tuple.dst.protonum = IPPROTO_TCP,
f587de0e
PM		 1180 .help = q931_help
1181 },
1182};
1183
1184/****************************************************************************/
3db05fea 1185static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1186 int *datalen)
1187{
905e3e8e
JE		 1188 const struct udphdr *uh;
1189 struct udphdr _uh;
f587de0e
PM		 1190 int dataoff;
1191
3db05fea 1192 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1193 if (uh == NULL)
1194 return NULL;
1195 dataoff = protoff + sizeof(_uh);
3db05fea 1196 if (dataoff >= skb->len)
f587de0e 1197 return NULL;
3db05fea
HX		 1198 *datalen = skb->len - dataoff;
1199 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1200}
1201
1202/****************************************************************************/
1203static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
643a2c15 1204 union nf_inet_addr *addr,
f587de0e
PM		 1205 __be16 port)
1206{
1207 struct nf_conntrack_expect *exp;
1208 struct nf_conntrack_tuple tuple;
1209
1210 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1211 tuple.src.u.tcp.port = 0;
1212 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1213 tuple.dst.u.tcp.port = port;
1214 tuple.dst.protonum = IPPROTO_TCP;
1215
6823645d 1216 exp = __nf_ct_expect_find(&tuple);
f587de0e
PM		 1217 if (exp && exp->master == ct)
1218 return exp;
1219 return NULL;
1220}
1221
1222/****************************************************************************/
1223static int set_expect_timeout(struct nf_conntrack_expect *exp,
1224 unsigned timeout)
1225{
1226 if (!exp || !del_timer(&exp->timeout))
1227 return 0;
1228
1229 exp->timeout.expires = jiffies + timeout * HZ;
1230 add_timer(&exp->timeout);
1231
1232 return 1;
1233}
1234
1235/****************************************************************************/
3db05fea 1236static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1237 enum ip_conntrack_info ctinfo,
1238 unsigned char **data,
1239 TransportAddress *taddr, int count)
1240{
1241 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1242 int dir = CTINFO2DIR(ctinfo);
1243 int ret = 0;
1244 int i;
1245 __be16 port;
643a2c15 1246 union nf_inet_addr addr;
f587de0e
PM		 1247 struct nf_conntrack_expect *exp;
1248 typeof(nat_q931_hook) nat_q931;
1249
1250 /* Look for the first related address */
1251 for (i = 0; i < count; i++) {
1252 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1253 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1254 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1255 break;
1256 }
1257
1258 if (i >= count) /* Not found */
1259 return 0;
1260
1261 /* Create expect for Q.931 */
6823645d 1262 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1263 return -1;
6823645d
PM		 1264 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1265 gkrouted_only ? /* only accept calls from GK? */
1266 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1267 &ct->tuplehash[!dir].tuple.dst.u3,
1268 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1269 exp->helper = nf_conntrack_helper_q931;
1270 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1271
1272 nat_q931 = rcu_dereference(nat_q931_hook);
1273 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
3db05fea 1274 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
f587de0e 1275 } else { /* Conntrack only */
6823645d 1276 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1277 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1278 NF_CT_DUMP_TUPLE(&exp->tuple);
1279
1280 /* Save port for looking up expect in processing RCF */
1281 info->sig_port[dir] = port;
1282 } else
1283 ret = -1;
1284 }
1285
6823645d 1286 nf_ct_expect_put(exp);
f587de0e
PM		 1287
1288 return ret;
1289}
1290
1291/****************************************************************************/
3db05fea 1292static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1293 enum ip_conntrack_info ctinfo,
1294 unsigned char **data, GatekeeperRequest *grq)
1295{
1296 typeof(set_ras_addr_hook) set_ras_addr;
1297
0d53778e 1298 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1299
1300 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1301 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
3db05fea 1302 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1303 &grq->rasAddress, 1);
1304 return 0;
1305}
1306
1307/****************************************************************************/
3db05fea 1308static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1309 enum ip_conntrack_info ctinfo,
1310 unsigned char **data, GatekeeperConfirm *gcf)
1311{
1312 int dir = CTINFO2DIR(ctinfo);
1313 int ret = 0;
1314 __be16 port;
643a2c15 1315 union nf_inet_addr addr;
f587de0e
PM		 1316 struct nf_conntrack_expect *exp;
1317
0d53778e 1318 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1319
1320 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1321 return 0;
1322
1323 /* Registration port is the same as discovery port */
1324 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1325 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1326 return 0;
1327
1328 /* Avoid RAS expectation loops. A GCF is never expected. */
1329 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1330 return 0;
1331
1332 /* Need new expect */
6823645d 1333 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1334 return -1;
6823645d
PM		 1335 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1336 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1337 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1338 exp->helper = nf_conntrack_helper_ras;
1339
6823645d 1340 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1341 pr_debug("nf_ct_ras: expect RAS ");
f587de0e
PM		 1342 NF_CT_DUMP_TUPLE(&exp->tuple);
1343 } else
1344 ret = -1;
1345
6823645d 1346 nf_ct_expect_put(exp);
f587de0e
PM		 1347
1348 return ret;
1349}
1350
1351/****************************************************************************/
3db05fea 1352static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1353 enum ip_conntrack_info ctinfo,
1354 unsigned char **data, RegistrationRequest *rrq)
1355{
1356 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1357 int ret;
1358 typeof(set_ras_addr_hook) set_ras_addr;
1359
0d53778e 1360 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1361
3db05fea 1362 ret = expect_q931(skb, ct, ctinfo, data,
f587de0e
PM		 1363 rrq->callSignalAddress.item,
1364 rrq->callSignalAddress.count);
1365 if (ret < 0)
1366 return -1;
1367
1368 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1369 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1370 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1371 rrq->rasAddress.item,
1372 rrq->rasAddress.count);
1373 if (ret < 0)
1374 return -1;
1375 }
1376
1377 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1378 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1379 info->timeout = rrq->timeToLive;
1380 } else
1381 info->timeout = default_rrq_ttl;
1382
1383 return 0;
1384}
1385
1386/****************************************************************************/
3db05fea 1387static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1388 enum ip_conntrack_info ctinfo,
1389 unsigned char **data, RegistrationConfirm *rcf)
1390{
1391 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1392 int dir = CTINFO2DIR(ctinfo);
1393 int ret;
1394 struct nf_conntrack_expect *exp;
1395 typeof(set_sig_addr_hook) set_sig_addr;
1396
0d53778e 1397 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1398
1399 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1400 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1401 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1402 rcf->callSignalAddress.item,
1403 rcf->callSignalAddress.count);
1404 if (ret < 0)
1405 return -1;
1406 }
1407
1408 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1409 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1410 info->timeout = rcf->timeToLive;
1411 }
1412
1413 if (info->timeout > 0) {
0d53778e
PM		 1414 pr_debug("nf_ct_ras: set RAS connection timeout to "
1415 "%u seconds\n", info->timeout);
3db05fea 1416 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1417
1418 /* Set expect timeout */
f8ba1aff 1419 spin_lock_bh(&nf_conntrack_lock);
f587de0e
PM		 1420 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1421 info->sig_port[!dir]);
1422 if (exp) {
0d53778e
PM		 1423 pr_debug("nf_ct_ras: set Q.931 expect "
1424 "timeout to %u seconds for",
1425 info->timeout);
f587de0e
PM		 1426 NF_CT_DUMP_TUPLE(&exp->tuple);
1427 set_expect_timeout(exp, info->timeout);
1428 }
f8ba1aff 1429 spin_unlock_bh(&nf_conntrack_lock);
f587de0e
PM		 1430 }
1431
1432 return 0;
1433}
1434
1435/****************************************************************************/
3db05fea 1436static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1437 enum ip_conntrack_info ctinfo,
1438 unsigned char **data, UnregistrationRequest *urq)
1439{
1440 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1441 int dir = CTINFO2DIR(ctinfo);
1442 int ret;
1443 typeof(set_sig_addr_hook) set_sig_addr;
1444
0d53778e 1445 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1446
1447 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1448 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1449 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1450 urq->callSignalAddress.item,
1451 urq->callSignalAddress.count);
1452 if (ret < 0)
1453 return -1;
1454 }
1455
1456 /* Clear old expect */
1457 nf_ct_remove_expectations(ct);
1458 info->sig_port[dir] = 0;
1459 info->sig_port[!dir] = 0;
1460
1461 /* Give it 30 seconds for UCF or URJ */
3db05fea 1462 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1463
1464 return 0;
1465}
1466
1467/****************************************************************************/
3db05fea 1468static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1469 enum ip_conntrack_info ctinfo,
1470 unsigned char **data, AdmissionRequest *arq)
1471{
905e3e8e 1472 const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
f587de0e
PM		 1473 int dir = CTINFO2DIR(ctinfo);
1474 __be16 port;
643a2c15 1475 union nf_inet_addr addr;
f587de0e
PM		 1476 typeof(set_h225_addr_hook) set_h225_addr;
1477
0d53778e 1478 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1479
1480 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1481 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1482 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1483 &addr, &port) &&
f587de0e
PM		 1484 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1485 port == info->sig_port[dir] &&
1486 set_h225_addr && ct->status & IPS_NAT_MASK) {
1487 /* Answering ARQ */
3db05fea 1488 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1489 &arq->destCallSignalAddress,
1490 &ct->tuplehash[!dir].tuple.dst.u3,
1491 info->sig_port[!dir]);
1492 }
1493
1494 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1495 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1496 &addr, &port) &&
f587de0e
PM		 1497 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1498 set_h225_addr && ct->status & IPS_NAT_MASK) {
1499 /* Calling ARQ */
3db05fea 1500 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1501 &arq->srcCallSignalAddress,
1502 &ct->tuplehash[!dir].tuple.dst.u3,
1503 port);
1504 }
1505
1506 return 0;
1507}
1508
1509/****************************************************************************/
3db05fea 1510static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1511 enum ip_conntrack_info ctinfo,
1512 unsigned char **data, AdmissionConfirm *acf)
1513{
1514 int dir = CTINFO2DIR(ctinfo);
1515 int ret = 0;
1516 __be16 port;
643a2c15 1517 union nf_inet_addr addr;
f587de0e
PM		 1518 struct nf_conntrack_expect *exp;
1519 typeof(set_sig_addr_hook) set_sig_addr;
1520
0d53778e 1521 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1522
1523 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1524 &addr, &port))
1525 return 0;
1526
1527 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1528 /* Answering ACF */
1529 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1530 if (set_sig_addr && ct->status & IPS_NAT_MASK)
3db05fea 1531 return set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1532 &acf->destCallSignalAddress, 1);
1533 return 0;
1534 }
1535
1536 /* Need new expect */
6823645d 1537 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1538 return -1;
6823645d
PM		 1539 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1540 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1541 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1542 exp->flags = NF_CT_EXPECT_PERMANENT;
1543 exp->helper = nf_conntrack_helper_q931;
1544
6823645d 1545 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1546 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1547 NF_CT_DUMP_TUPLE(&exp->tuple);
1548 } else
1549 ret = -1;
1550
6823645d 1551 nf_ct_expect_put(exp);
f587de0e
PM		 1552
1553 return ret;
1554}
1555
1556/****************************************************************************/
3db05fea 1557static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1558 enum ip_conntrack_info ctinfo,
1559 unsigned char **data, LocationRequest *lrq)
1560{
1561 typeof(set_ras_addr_hook) set_ras_addr;
1562
0d53778e 1563 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1564
1565 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1566 if (set_ras_addr && ct->status & IPS_NAT_MASK)
3db05fea 1567 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1568 &lrq->replyAddress, 1);
1569 return 0;
1570}
1571
1572/****************************************************************************/
3db05fea 1573static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1574 enum ip_conntrack_info ctinfo,
1575 unsigned char **data, LocationConfirm *lcf)
1576{
1577 int dir = CTINFO2DIR(ctinfo);
1578 int ret = 0;
1579 __be16 port;
643a2c15 1580 union nf_inet_addr addr;
f587de0e
PM		 1581 struct nf_conntrack_expect *exp;
1582
0d53778e 1583 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1584
1585 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1586 &addr, &port))
1587 return 0;
1588
1589 /* Need new expect for call signal */
6823645d 1590 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1591 return -1;
6823645d
PM		 1592 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1593 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1594 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1595 exp->flags = NF_CT_EXPECT_PERMANENT;
1596 exp->helper = nf_conntrack_helper_q931;
1597
6823645d 1598 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1599 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1600 NF_CT_DUMP_TUPLE(&exp->tuple);
1601 } else
1602 ret = -1;
1603
6823645d 1604 nf_ct_expect_put(exp);
f587de0e
PM		 1605
1606 /* Ignore rasAddress */
1607
1608 return ret;
1609}
1610
1611/****************************************************************************/
3db05fea 1612static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1613 enum ip_conntrack_info ctinfo,
1614 unsigned char **data, InfoRequestResponse *irr)
1615{
1616 int ret;
1617 typeof(set_ras_addr_hook) set_ras_addr;
1618 typeof(set_sig_addr_hook) set_sig_addr;
1619
0d53778e 1620 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1621
1622 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1623 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1624 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1625 &irr->rasAddress, 1);
1626 if (ret < 0)
1627 return -1;
1628 }
1629
1630 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1631 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1632 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1633 irr->callSignalAddress.item,
1634 irr->callSignalAddress.count);
1635 if (ret < 0)
1636 return -1;
1637 }
1638
1639 return 0;
1640}
1641
1642/****************************************************************************/
3db05fea 1643static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1644 enum ip_conntrack_info ctinfo,
1645 unsigned char **data, RasMessage *ras)
1646{
1647 switch (ras->choice) {
1648 case eRasMessage_gatekeeperRequest:
3db05fea 1649 return process_grq(skb, ct, ctinfo, data,
f587de0e
PM		 1650 &ras->gatekeeperRequest);
1651 case eRasMessage_gatekeeperConfirm:
3db05fea 1652 return process_gcf(skb, ct, ctinfo, data,
f587de0e
PM		 1653 &ras->gatekeeperConfirm);
1654 case eRasMessage_registrationRequest:
3db05fea 1655 return process_rrq(skb, ct, ctinfo, data,
f587de0e
PM		 1656 &ras->registrationRequest);
1657 case eRasMessage_registrationConfirm:
3db05fea 1658 return process_rcf(skb, ct, ctinfo, data,
f587de0e
PM		 1659 &ras->registrationConfirm);
1660 case eRasMessage_unregistrationRequest:
3db05fea 1661 return process_urq(skb, ct, ctinfo, data,
f587de0e
PM		 1662 &ras->unregistrationRequest);
1663 case eRasMessage_admissionRequest:
3db05fea 1664 return process_arq(skb, ct, ctinfo, data,
f587de0e
PM		 1665 &ras->admissionRequest);
1666 case eRasMessage_admissionConfirm:
3db05fea 1667 return process_acf(skb, ct, ctinfo, data,
f587de0e
PM		 1668 &ras->admissionConfirm);
1669 case eRasMessage_locationRequest:
3db05fea 1670 return process_lrq(skb, ct, ctinfo, data,
f587de0e
PM		 1671 &ras->locationRequest);
1672 case eRasMessage_locationConfirm:
3db05fea 1673 return process_lcf(skb, ct, ctinfo, data,
f587de0e
PM		 1674 &ras->locationConfirm);
1675 case eRasMessage_infoRequestResponse:
3db05fea 1676 return process_irr(skb, ct, ctinfo, data,
f587de0e
PM		 1677 &ras->infoRequestResponse);
1678 default:
0d53778e 1679 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1680 break;
1681 }
1682
1683 return 0;
1684}
1685
1686/****************************************************************************/
3db05fea 1687static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1688 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1689{
1690 static RasMessage ras;
1691 unsigned char *data;
1692 int datalen = 0;
1693 int ret;
1694
3db05fea 1695 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1696
1697 spin_lock_bh(&nf_h323_lock);
1698
1699 /* Get UDP data */
3db05fea 1700 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1701 if (data == NULL)
1702 goto accept;
0d53778e 1703 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
f587de0e
PM		 1704 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1705
1706 /* Decode RAS message */
1707 ret = DecodeRasMessage(data, datalen, &ras);
1708 if (ret < 0) {
0d53778e
PM		 1709 pr_debug("nf_ct_ras: decoding error: %s\n",
1710 ret == H323_ERROR_BOUND ?
1711 "out of bound" : "out of range");
f587de0e
PM		 1712 goto accept;
1713 }
1714
1715 /* Process RAS message */
3db05fea 1716 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
f587de0e
PM		 1717 goto drop;
1718
1719 accept:
1720 spin_unlock_bh(&nf_h323_lock);
1721 return NF_ACCEPT;
1722
1723 drop:
1724 spin_unlock_bh(&nf_h323_lock);
1725 if (net_ratelimit())
1726 printk("nf_ct_ras: packet dropped\n");
1727 return NF_DROP;
1728}
1729
1730/****************************************************************************/
1731static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1732 {
1733 .name = "RAS",
1734 .me = THIS_MODULE,
1735 .max_expected = 32,
1736 .timeout = 240,
1737 .tuple.src.l3num = AF_INET,
1738 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1739 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 1740 .help = ras_help,
1741 },
1742 {
1743 .name = "RAS",
1744 .me = THIS_MODULE,
1745 .max_expected = 32,
1746 .timeout = 240,
1747 .tuple.src.l3num = AF_INET6,
1748 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1749 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 1750 .help = ras_help,
1751 },
1752};
1753
1754/****************************************************************************/
1755static void __exit nf_conntrack_h323_fini(void)
1756{
1757 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1758 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1759 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1760 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1761 kfree(h323_buffer);
0d53778e 1762 pr_debug("nf_ct_h323: fini\n");
f587de0e
PM		 1763}
1764
1765/****************************************************************************/
1766static int __init nf_conntrack_h323_init(void)
1767{
1768 int ret;
1769
1770 h323_buffer = kmalloc(65536, GFP_KERNEL);
1771 if (!h323_buffer)
1772 return -ENOMEM;
1773 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1774 if (ret < 0)
1775 goto err1;
1776 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1777 if (ret < 0)
1778 goto err2;
1779 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1780 if (ret < 0)
1781 goto err3;
1782 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1783 if (ret < 0)
1784 goto err4;
0d53778e 1785 pr_debug("nf_ct_h323: init success\n");
f587de0e
PM		 1786 return 0;
1787
1788err4:
1789 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1790err3:
1791 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1792err2:
1793 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1794err1:
1795 return ret;
1796}
1797
1798/****************************************************************************/
1799module_init(nf_conntrack_h323_init);
1800module_exit(nf_conntrack_h323_fini);
1801
1802EXPORT_SYMBOL_GPL(get_h225_addr);
1803EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1804EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1805EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1806EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1807EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1808EXPORT_SYMBOL_GPL(nat_t120_hook);
1809EXPORT_SYMBOL_GPL(nat_h245_hook);
1810EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1811EXPORT_SYMBOL_GPL(nat_q931_hook);
1812
1813MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1814MODULE_DESCRIPTION("H.323 connection tracking helper");
1815MODULE_LICENSE("GPL");
1816MODULE_ALIAS("ip_conntrack_h323");
Linux kernel - Deliverables
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