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[NETFILTER]: Kill function prototype for non-existing function
[net-next-2.6.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,
53 union nf_conntrack_address *addr, __be16 port)
54 __read_mostly;
3db05fea 55int (*set_h225_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 56 unsigned char **data, int dataoff,
57 TransportAddress *taddr,
58 union nf_conntrack_address *addr, __be16 port)
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);
117 struct tcphdr _tcph, *th;
118 int tcpdatalen;
119 int tcpdataoff;
120 unsigned char *tpkt;
121 int tpktlen;
122 int tpktoff;
123
124 /* Get TCP header */
3db05fea 125 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
f587de0e
PM		 126 if (th == NULL)
127 return 0;
128
129 /* Get TCP data offset */
130 tcpdataoff = protoff + th->doff * 4;
131
132 /* Get TCP data length */
3db05fea 133 tcpdatalen = skb->len - tcpdataoff;
f587de0e
PM		 134 if (tcpdatalen <= 0) /* No TCP data */
135 goto clear_out;
136
137 if (*data == NULL) { /* first TPKT */
138 /* Get first TPKT pointer */
3db05fea 139 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
f587de0e
PM		 140 h323_buffer);
141 BUG_ON(tpkt == NULL);
142
143 /* Validate TPKT identifier */
144 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
145 /* Netmeeting sends TPKT header and data separately */
146 if (info->tpkt_len[dir] > 0) {
0d53778e
PM		 147 pr_debug("nf_ct_h323: previous packet "
148 "indicated separate TPKT data of %hu "
149 "bytes\n", info->tpkt_len[dir]);
f587de0e
PM		 150 if (info->tpkt_len[dir] <= tcpdatalen) {
151 /* Yes, there was a TPKT header
152 * received */
153 *data = tpkt;
154 *datalen = info->tpkt_len[dir];
155 *dataoff = 0;
156 goto out;
157 }
158
159 /* Fragmented TPKT */
0d53778e 160 pr_debug("nf_ct_h323: fragmented TPKT\n");
f587de0e
PM		 161 goto clear_out;
162 }
163
164 /* It is not even a TPKT */
165 return 0;
166 }
167 tpktoff = 0;
168 } else { /* Next TPKT */
169 tpktoff = *dataoff + *datalen;
170 tcpdatalen -= tpktoff;
171 if (tcpdatalen <= 4) /* No more TPKT */
172 goto clear_out;
173 tpkt = *data + *datalen;
174
175 /* Validate TPKT identifier */
176 if (tpkt[0] != 0x03 || tpkt[1] != 0)
177 goto clear_out;
178 }
179
180 /* Validate TPKT length */
181 tpktlen = tpkt[2] * 256 + tpkt[3];
182 if (tpktlen < 4)
183 goto clear_out;
184 if (tpktlen > tcpdatalen) {
185 if (tcpdatalen == 4) { /* Separate TPKT header */
186 /* Netmeeting sends TPKT header and data separately */
0d53778e
PM		 187 pr_debug("nf_ct_h323: separate TPKT header indicates "
188 "there will be TPKT data of %hu bytes\n",
189 tpktlen - 4);
f587de0e
PM		 190 info->tpkt_len[dir] = tpktlen - 4;
191 return 0;
192 }
193
194 if (net_ratelimit())
195 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
196 goto clear_out;
197 }
198
199 /* This is the encapsulated data */
200 *data = tpkt + 4;
201 *datalen = tpktlen - 4;
202 *dataoff = tpktoff + 4;
203
204 out:
205 /* Clear TPKT length */
206 info->tpkt_len[dir] = 0;
207 return 1;
208
209 clear_out:
210 info->tpkt_len[dir] = 0;
211 return 0;
212}
213
214/****************************************************************************/
215static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
216 H245_TransportAddress *taddr,
217 union nf_conntrack_address *addr, __be16 *port)
218{
219 unsigned char *p;
220 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
221 int len;
222
223 if (taddr->choice != eH245_TransportAddress_unicastAddress)
224 return 0;
225
226 switch (taddr->unicastAddress.choice) {
227 case eUnicastAddress_iPAddress:
228 if (family != AF_INET)
229 return 0;
230 p = data + taddr->unicastAddress.iPAddress.network;
231 len = 4;
232 break;
233 case eUnicastAddress_iP6Address:
234 if (family != AF_INET6)
235 return 0;
236 p = data + taddr->unicastAddress.iP6Address.network;
237 len = 16;
238 break;
239 default:
240 return 0;
241 }
242
243 memcpy(addr, p, len);
244 memset((void *)addr + len, 0, sizeof(*addr) - len);
245 memcpy(port, p + len, sizeof(__be16));
246
247 return 1;
248}
249
250/****************************************************************************/
3db05fea 251static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 252 enum ip_conntrack_info ctinfo,
253 unsigned char **data, int dataoff,
254 H245_TransportAddress *taddr)
255{
256 int dir = CTINFO2DIR(ctinfo);
257 int ret = 0;
258 __be16 port;
259 __be16 rtp_port, rtcp_port;
260 union nf_conntrack_address addr;
261 struct nf_conntrack_expect *rtp_exp;
262 struct nf_conntrack_expect *rtcp_exp;
263 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
264
265 /* Read RTP or RTCP address */
266 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
267 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
268 port == 0)
269 return 0;
270
271 /* RTP port is even */
272 port &= htons(~1);
273 rtp_port = port;
274 rtcp_port = htons(ntohs(port) + 1);
275
276 /* Create expect for RTP */
6823645d 277 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 278 return -1;
6823645d
PM		 279 nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
280 &ct->tuplehash[!dir].tuple.src.u3,
281 &ct->tuplehash[!dir].tuple.dst.u3,
282 IPPROTO_UDP, NULL, &rtp_port);
f587de0e
PM		 283
284 /* Create expect for RTCP */
6823645d
PM		 285 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
286 nf_ct_expect_put(rtp_exp);
f587de0e
PM		 287 return -1;
288 }
6823645d
PM		 289 nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
290 &ct->tuplehash[!dir].tuple.src.u3,
291 &ct->tuplehash[!dir].tuple.dst.u3,
292 IPPROTO_UDP, NULL, &rtcp_port);
f587de0e
PM		 293
294 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
601e68e1 295 &ct->tuplehash[!dir].tuple.dst.u3,
f587de0e
PM		 296 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
297 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
298 ct->status & IPS_NAT_MASK) {
299 /* NAT needed */
3db05fea 300 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 301 taddr, port, rtp_port, rtp_exp, rtcp_exp);
302 } else { /* Conntrack only */
6823645d
PM		 303 if (nf_ct_expect_related(rtp_exp) == 0) {
304 if (nf_ct_expect_related(rtcp_exp) == 0) {
0d53778e 305 pr_debug("nf_ct_h323: expect RTP ");
f587de0e 306 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
0d53778e 307 pr_debug("nf_ct_h323: expect RTCP ");
f587de0e
PM		 308 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
309 } else {
6823645d 310 nf_ct_unexpect_related(rtp_exp);
f587de0e
PM		 311 ret = -1;
312 }
313 } else
314 ret = -1;
315 }
316
6823645d
PM		 317 nf_ct_expect_put(rtp_exp);
318 nf_ct_expect_put(rtcp_exp);
f587de0e
PM		 319
320 return ret;
321}
322
323/****************************************************************************/
3db05fea 324static int expect_t120(struct sk_buff *skb,
f587de0e
PM		 325 struct nf_conn *ct,
326 enum ip_conntrack_info ctinfo,
327 unsigned char **data, int dataoff,
328 H245_TransportAddress *taddr)
329{
330 int dir = CTINFO2DIR(ctinfo);
331 int ret = 0;
332 __be16 port;
333 union nf_conntrack_address addr;
334 struct nf_conntrack_expect *exp;
335 typeof(nat_t120_hook) nat_t120;
336
337 /* Read T.120 address */
338 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
339 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
340 port == 0)
341 return 0;
342
343 /* Create expect for T.120 connections */
6823645d 344 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 345 return -1;
6823645d
PM		 346 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
347 &ct->tuplehash[!dir].tuple.src.u3,
348 &ct->tuplehash[!dir].tuple.dst.u3,
349 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 350 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
351
352 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
353 &ct->tuplehash[!dir].tuple.dst.u3,
354 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
355 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
356 ct->status & IPS_NAT_MASK) {
357 /* NAT needed */
3db05fea 358 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 359 port, exp);
360 } else { /* Conntrack only */
6823645d 361 if (nf_ct_expect_related(exp) == 0) {
0d53778e 362 pr_debug("nf_ct_h323: expect T.120 ");
f587de0e
PM		 363 NF_CT_DUMP_TUPLE(&exp->tuple);
364 } else
365 ret = -1;
366 }
367
6823645d 368 nf_ct_expect_put(exp);
f587de0e
PM		 369
370 return ret;
371}
372
373/****************************************************************************/
3db05fea 374static int process_h245_channel(struct sk_buff *skb,
f587de0e
PM		 375 struct nf_conn *ct,
376 enum ip_conntrack_info ctinfo,
377 unsigned char **data, int dataoff,
378 H2250LogicalChannelParameters *channel)
379{
380 int ret;
381
382 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
383 /* RTP */
3db05fea 384 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 385 &channel->mediaChannel);
386 if (ret < 0)
387 return -1;
388 }
389
390 if (channel->
391 options & eH2250LogicalChannelParameters_mediaControlChannel) {
392 /* RTCP */
3db05fea 393 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 394 &channel->mediaControlChannel);
395 if (ret < 0)
396 return -1;
397 }
398
399 return 0;
400}
401
402/****************************************************************************/
3db05fea 403static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 404 enum ip_conntrack_info ctinfo,
405 unsigned char **data, int dataoff,
406 OpenLogicalChannel *olc)
407{
408 int ret;
409
0d53778e 410 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
f587de0e
PM		 411
412 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
413 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
414 {
3db05fea 415 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 416 &olc->
417 forwardLogicalChannelParameters.
418 multiplexParameters.
419 h2250LogicalChannelParameters);
420 if (ret < 0)
421 return -1;
422 }
423
424 if ((olc->options &
425 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
426 (olc->reverseLogicalChannelParameters.options &
427 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
428 && (olc->reverseLogicalChannelParameters.multiplexParameters.
429 choice ==
430 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
431 {
432 ret =
3db05fea 433 process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 434 &olc->
435 reverseLogicalChannelParameters.
436 multiplexParameters.
437 h2250LogicalChannelParameters);
438 if (ret < 0)
439 return -1;
440 }
441
442 if ((olc->options & eOpenLogicalChannel_separateStack) &&
443 olc->forwardLogicalChannelParameters.dataType.choice ==
444 eDataType_data &&
445 olc->forwardLogicalChannelParameters.dataType.data.application.
446 choice == eDataApplicationCapability_application_t120 &&
447 olc->forwardLogicalChannelParameters.dataType.data.application.
448 t120.choice == eDataProtocolCapability_separateLANStack &&
449 olc->separateStack.networkAddress.choice ==
450 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 451 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 452 &olc->separateStack.networkAddress.
453 localAreaAddress);
454 if (ret < 0)
455 return -1;
456 }
457
458 return 0;
459}
460
461/****************************************************************************/
3db05fea 462static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 463 enum ip_conntrack_info ctinfo,
464 unsigned char **data, int dataoff,
465 OpenLogicalChannelAck *olca)
466{
467 H2250LogicalChannelAckParameters *ack;
468 int ret;
469
0d53778e 470 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
f587de0e
PM		 471
472 if ((olca->options &
473 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
474 (olca->reverseLogicalChannelParameters.options &
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
476 && (olca->reverseLogicalChannelParameters.multiplexParameters.
477 choice ==
478 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
479 {
3db05fea 480 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 481 &olca->
482 reverseLogicalChannelParameters.
483 multiplexParameters.
484 h2250LogicalChannelParameters);
485 if (ret < 0)
486 return -1;
487 }
488
489 if ((olca->options &
490 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
491 (olca->forwardMultiplexAckParameters.choice ==
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
493 {
494 ack = &olca->forwardMultiplexAckParameters.
495 h2250LogicalChannelAckParameters;
496 if (ack->options &
497 eH2250LogicalChannelAckParameters_mediaChannel) {
498 /* RTP */
3db05fea 499 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 500 &ack->mediaChannel);
501 if (ret < 0)
502 return -1;
503 }
504
505 if (ack->options &
506 eH2250LogicalChannelAckParameters_mediaControlChannel) {
507 /* RTCP */
3db05fea 508 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 509 &ack->mediaControlChannel);
510 if (ret < 0)
511 return -1;
512 }
513 }
514
f8f1c08e
JMZ		 515 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
516 olca->separateStack.networkAddress.choice ==
517 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 518 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f8f1c08e
JMZ		 519 &olca->separateStack.networkAddress.
520 localAreaAddress);
521 if (ret < 0)
522 return -1;
523 }
524
f587de0e
PM		 525 return 0;
526}
527
528/****************************************************************************/
3db05fea 529static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 530 enum ip_conntrack_info ctinfo,
531 unsigned char **data, int dataoff,
532 MultimediaSystemControlMessage *mscm)
533{
534 switch (mscm->choice) {
535 case eMultimediaSystemControlMessage_request:
536 if (mscm->request.choice ==
537 eRequestMessage_openLogicalChannel) {
3db05fea 538 return process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 539 &mscm->request.openLogicalChannel);
540 }
0d53778e
PM		 541 pr_debug("nf_ct_h323: H.245 Request %d\n",
542 mscm->request.choice);
f587de0e
PM		 543 break;
544 case eMultimediaSystemControlMessage_response:
545 if (mscm->response.choice ==
546 eResponseMessage_openLogicalChannelAck) {
3db05fea 547 return process_olca(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 548 &mscm->response.
549 openLogicalChannelAck);
550 }
0d53778e
PM		 551 pr_debug("nf_ct_h323: H.245 Response %d\n",
552 mscm->response.choice);
f587de0e
PM		 553 break;
554 default:
0d53778e 555 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
f587de0e
PM		 556 break;
557 }
558
559 return 0;
560}
561
562/****************************************************************************/
3db05fea 563static int h245_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 564 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
565{
566 static MultimediaSystemControlMessage mscm;
567 unsigned char *data = NULL;
568 int datalen;
569 int dataoff;
570 int ret;
571
572 /* Until there's been traffic both ways, don't look in packets. */
573 if (ctinfo != IP_CT_ESTABLISHED &&
574 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
575 return NF_ACCEPT;
576 }
3db05fea 577 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
f587de0e
PM		 578
579 spin_lock_bh(&nf_h323_lock);
580
581 /* Process each TPKT */
3db05fea 582 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 583 &data, &datalen, &dataoff)) {
0d53778e 584 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
f587de0e
PM		 585 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
586
587 /* Decode H.245 signal */
588 ret = DecodeMultimediaSystemControlMessage(data, datalen,
589 &mscm);
590 if (ret < 0) {
0d53778e
PM		 591 pr_debug("nf_ct_h245: decoding error: %s\n",
592 ret == H323_ERROR_BOUND ?
593 "out of bound" : "out of range");
f587de0e
PM		 594 /* We don't drop when decoding error */
595 break;
596 }
597
598 /* Process H.245 signal */
3db05fea 599 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
f587de0e
PM		 600 goto drop;
601 }
602
603 spin_unlock_bh(&nf_h323_lock);
604 return NF_ACCEPT;
605
606 drop:
607 spin_unlock_bh(&nf_h323_lock);
608 if (net_ratelimit())
609 printk("nf_ct_h245: packet dropped\n");
610 return NF_DROP;
611}
612
613/****************************************************************************/
614static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
615 .name = "H.245",
616 .me = THIS_MODULE,
617 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
618 .timeout = 240,
619 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 620 .help = h245_help
621};
622
623/****************************************************************************/
624int get_h225_addr(struct nf_conn *ct, unsigned char *data,
625 TransportAddress *taddr,
626 union nf_conntrack_address *addr, __be16 *port)
627{
628 unsigned char *p;
629 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
630 int len;
631
632 switch (taddr->choice) {
633 case eTransportAddress_ipAddress:
634 if (family != AF_INET)
635 return 0;
636 p = data + taddr->ipAddress.ip;
637 len = 4;
638 break;
639 case eTransportAddress_ip6Address:
640 if (family != AF_INET6)
641 return 0;
bb807245 642 p = data + taddr->ip6Address.ip;
f587de0e
PM		 643 len = 16;
644 break;
645 default:
646 return 0;
647 }
648
649 memcpy(addr, p, len);
650 memset((void *)addr + len, 0, sizeof(*addr) - len);
651 memcpy(port, p + len, sizeof(__be16));
652
653 return 1;
654}
655
656/****************************************************************************/
3db05fea 657static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 658 enum ip_conntrack_info ctinfo,
659 unsigned char **data, int dataoff,
660 TransportAddress *taddr)
661{
662 int dir = CTINFO2DIR(ctinfo);
663 int ret = 0;
664 __be16 port;
665 union nf_conntrack_address addr;
666 struct nf_conntrack_expect *exp;
667 typeof(nat_h245_hook) nat_h245;
668
669 /* Read h245Address */
670 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
671 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
672 port == 0)
673 return 0;
674
675 /* Create expect for h245 connection */
6823645d 676 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 677 return -1;
6823645d
PM		 678 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
679 &ct->tuplehash[!dir].tuple.src.u3,
680 &ct->tuplehash[!dir].tuple.dst.u3,
681 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 682 exp->helper = &nf_conntrack_helper_h245;
683
684 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
685 &ct->tuplehash[!dir].tuple.dst.u3,
686 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
687 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
688 ct->status & IPS_NAT_MASK) {
689 /* NAT needed */
3db05fea 690 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 691 port, exp);
692 } else { /* Conntrack only */
6823645d 693 if (nf_ct_expect_related(exp) == 0) {
0d53778e 694 pr_debug("nf_ct_q931: expect H.245 ");
f587de0e
PM		 695 NF_CT_DUMP_TUPLE(&exp->tuple);
696 } else
697 ret = -1;
698 }
699
6823645d 700 nf_ct_expect_put(exp);
f587de0e
PM		 701
702 return ret;
703}
704
705/* If the calling party is on the same side of the forward-to party,
706 * we don't need to track the second call */
707static int callforward_do_filter(union nf_conntrack_address *src,
708 union nf_conntrack_address *dst,
709 int family)
710{
1841a4c7 711 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;
775 union nf_conntrack_address addr;
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;
831 union nf_conntrack_address addr;
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) &&
845 (set_h225_addr) && ct->status && IPS_NAT_MASK &&
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{
1188 struct udphdr _uh, *uh;
1189 int dataoff;
1190
3db05fea 1191 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1192 if (uh == NULL)
1193 return NULL;
1194 dataoff = protoff + sizeof(_uh);
3db05fea 1195 if (dataoff >= skb->len)
f587de0e 1196 return NULL;
3db05fea
HX		 1197 *datalen = skb->len - dataoff;
1198 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1199}
1200
1201/****************************************************************************/
1202static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1203 union nf_conntrack_address *addr,
1204 __be16 port)
1205{
1206 struct nf_conntrack_expect *exp;
1207 struct nf_conntrack_tuple tuple;
1208
1209 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1210 tuple.src.u.tcp.port = 0;
1211 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1212 tuple.dst.u.tcp.port = port;
1213 tuple.dst.protonum = IPPROTO_TCP;
1214
6823645d 1215 exp = __nf_ct_expect_find(&tuple);
f587de0e
PM		 1216 if (exp && exp->master == ct)
1217 return exp;
1218 return NULL;
1219}
1220
1221/****************************************************************************/
1222static int set_expect_timeout(struct nf_conntrack_expect *exp,
1223 unsigned timeout)
1224{
1225 if (!exp || !del_timer(&exp->timeout))
1226 return 0;
1227
1228 exp->timeout.expires = jiffies + timeout * HZ;
1229 add_timer(&exp->timeout);
1230
1231 return 1;
1232}
1233
1234/****************************************************************************/
3db05fea 1235static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1236 enum ip_conntrack_info ctinfo,
1237 unsigned char **data,
1238 TransportAddress *taddr, int count)
1239{
1240 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1241 int dir = CTINFO2DIR(ctinfo);
1242 int ret = 0;
1243 int i;
1244 __be16 port;
1245 union nf_conntrack_address addr;
1246 struct nf_conntrack_expect *exp;
1247 typeof(nat_q931_hook) nat_q931;
1248
1249 /* Look for the first related address */
1250 for (i = 0; i < count; i++) {
1251 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1252 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1253 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1254 break;
1255 }
1256
1257 if (i >= count) /* Not found */
1258 return 0;
1259
1260 /* Create expect for Q.931 */
6823645d 1261 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1262 return -1;
6823645d
PM		 1263 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1264 gkrouted_only ? /* only accept calls from GK? */
1265 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1266 &ct->tuplehash[!dir].tuple.dst.u3,
1267 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1268 exp->helper = nf_conntrack_helper_q931;
1269 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1270
1271 nat_q931 = rcu_dereference(nat_q931_hook);
1272 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
3db05fea 1273 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
f587de0e 1274 } else { /* Conntrack only */
6823645d 1275 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1276 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1277 NF_CT_DUMP_TUPLE(&exp->tuple);
1278
1279 /* Save port for looking up expect in processing RCF */
1280 info->sig_port[dir] = port;
1281 } else
1282 ret = -1;
1283 }
1284
6823645d 1285 nf_ct_expect_put(exp);
f587de0e
PM		 1286
1287 return ret;
1288}
1289
1290/****************************************************************************/
3db05fea 1291static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1292 enum ip_conntrack_info ctinfo,
1293 unsigned char **data, GatekeeperRequest *grq)
1294{
1295 typeof(set_ras_addr_hook) set_ras_addr;
1296
0d53778e 1297 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1298
1299 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1300 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
3db05fea 1301 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1302 &grq->rasAddress, 1);
1303 return 0;
1304}
1305
1306/****************************************************************************/
3db05fea 1307static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1308 enum ip_conntrack_info ctinfo,
1309 unsigned char **data, GatekeeperConfirm *gcf)
1310{
1311 int dir = CTINFO2DIR(ctinfo);
1312 int ret = 0;
1313 __be16 port;
1314 union nf_conntrack_address addr;
1315 struct nf_conntrack_expect *exp;
1316
0d53778e 1317 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1318
1319 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1320 return 0;
1321
1322 /* Registration port is the same as discovery port */
1323 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1324 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1325 return 0;
1326
1327 /* Avoid RAS expectation loops. A GCF is never expected. */
1328 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1329 return 0;
1330
1331 /* Need new expect */
6823645d 1332 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1333 return -1;
6823645d
PM		 1334 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1335 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1336 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1337 exp->helper = nf_conntrack_helper_ras;
1338
6823645d 1339 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1340 pr_debug("nf_ct_ras: expect RAS ");
f587de0e
PM		 1341 NF_CT_DUMP_TUPLE(&exp->tuple);
1342 } else
1343 ret = -1;
1344
6823645d 1345 nf_ct_expect_put(exp);
f587de0e
PM		 1346
1347 return ret;
1348}
1349
1350/****************************************************************************/
3db05fea 1351static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1352 enum ip_conntrack_info ctinfo,
1353 unsigned char **data, RegistrationRequest *rrq)
1354{
1355 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1356 int ret;
1357 typeof(set_ras_addr_hook) set_ras_addr;
1358
0d53778e 1359 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1360
3db05fea 1361 ret = expect_q931(skb, ct, ctinfo, data,
f587de0e
PM		 1362 rrq->callSignalAddress.item,
1363 rrq->callSignalAddress.count);
1364 if (ret < 0)
1365 return -1;
1366
1367 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1368 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1369 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1370 rrq->rasAddress.item,
1371 rrq->rasAddress.count);
1372 if (ret < 0)
1373 return -1;
1374 }
1375
1376 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1377 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1378 info->timeout = rrq->timeToLive;
1379 } else
1380 info->timeout = default_rrq_ttl;
1381
1382 return 0;
1383}
1384
1385/****************************************************************************/
3db05fea 1386static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1387 enum ip_conntrack_info ctinfo,
1388 unsigned char **data, RegistrationConfirm *rcf)
1389{
1390 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1391 int dir = CTINFO2DIR(ctinfo);
1392 int ret;
1393 struct nf_conntrack_expect *exp;
1394 typeof(set_sig_addr_hook) set_sig_addr;
1395
0d53778e 1396 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1397
1398 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1399 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1400 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1401 rcf->callSignalAddress.item,
1402 rcf->callSignalAddress.count);
1403 if (ret < 0)
1404 return -1;
1405 }
1406
1407 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1408 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1409 info->timeout = rcf->timeToLive;
1410 }
1411
1412 if (info->timeout > 0) {
0d53778e
PM		 1413 pr_debug("nf_ct_ras: set RAS connection timeout to "
1414 "%u seconds\n", info->timeout);
3db05fea 1415 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1416
1417 /* Set expect timeout */
1418 read_lock_bh(&nf_conntrack_lock);
1419 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1420 info->sig_port[!dir]);
1421 if (exp) {
0d53778e
PM		 1422 pr_debug("nf_ct_ras: set Q.931 expect "
1423 "timeout to %u seconds for",
1424 info->timeout);
f587de0e
PM		 1425 NF_CT_DUMP_TUPLE(&exp->tuple);
1426 set_expect_timeout(exp, info->timeout);
1427 }
1428 read_unlock_bh(&nf_conntrack_lock);
1429 }
1430
1431 return 0;
1432}
1433
1434/****************************************************************************/
3db05fea 1435static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1436 enum ip_conntrack_info ctinfo,
1437 unsigned char **data, UnregistrationRequest *urq)
1438{
1439 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1440 int dir = CTINFO2DIR(ctinfo);
1441 int ret;
1442 typeof(set_sig_addr_hook) set_sig_addr;
1443
0d53778e 1444 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1445
1446 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1447 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1448 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1449 urq->callSignalAddress.item,
1450 urq->callSignalAddress.count);
1451 if (ret < 0)
1452 return -1;
1453 }
1454
1455 /* Clear old expect */
1456 nf_ct_remove_expectations(ct);
1457 info->sig_port[dir] = 0;
1458 info->sig_port[!dir] = 0;
1459
1460 /* Give it 30 seconds for UCF or URJ */
3db05fea 1461 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1462
1463 return 0;
1464}
1465
1466/****************************************************************************/
3db05fea 1467static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1468 enum ip_conntrack_info ctinfo,
1469 unsigned char **data, AdmissionRequest *arq)
1470{
1471 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1472 int dir = CTINFO2DIR(ctinfo);
1473 __be16 port;
1474 union nf_conntrack_address addr;
1475 typeof(set_h225_addr_hook) set_h225_addr;
1476
0d53778e 1477 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1478
1479 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1480 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1481 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1482 &addr, &port) &&
f587de0e
PM		 1483 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1484 port == info->sig_port[dir] &&
1485 set_h225_addr && ct->status & IPS_NAT_MASK) {
1486 /* Answering ARQ */
3db05fea 1487 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1488 &arq->destCallSignalAddress,
1489 &ct->tuplehash[!dir].tuple.dst.u3,
1490 info->sig_port[!dir]);
1491 }
1492
1493 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1494 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1495 &addr, &port) &&
f587de0e
PM		 1496 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1497 set_h225_addr && ct->status & IPS_NAT_MASK) {
1498 /* Calling ARQ */
3db05fea 1499 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1500 &arq->srcCallSignalAddress,
1501 &ct->tuplehash[!dir].tuple.dst.u3,
1502 port);
1503 }
1504
1505 return 0;
1506}
1507
1508/****************************************************************************/
3db05fea 1509static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1510 enum ip_conntrack_info ctinfo,
1511 unsigned char **data, AdmissionConfirm *acf)
1512{
1513 int dir = CTINFO2DIR(ctinfo);
1514 int ret = 0;
1515 __be16 port;
1516 union nf_conntrack_address addr;
1517 struct nf_conntrack_expect *exp;
1518 typeof(set_sig_addr_hook) set_sig_addr;
1519
0d53778e 1520 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1521
1522 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1523 &addr, &port))
1524 return 0;
1525
1526 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1527 /* Answering ACF */
1528 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1529 if (set_sig_addr && ct->status & IPS_NAT_MASK)
3db05fea 1530 return set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1531 &acf->destCallSignalAddress, 1);
1532 return 0;
1533 }
1534
1535 /* Need new expect */
6823645d 1536 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1537 return -1;
6823645d
PM		 1538 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1539 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1540 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1541 exp->flags = NF_CT_EXPECT_PERMANENT;
1542 exp->helper = nf_conntrack_helper_q931;
1543
6823645d 1544 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1545 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1546 NF_CT_DUMP_TUPLE(&exp->tuple);
1547 } else
1548 ret = -1;
1549
6823645d 1550 nf_ct_expect_put(exp);
f587de0e
PM		 1551
1552 return ret;
1553}
1554
1555/****************************************************************************/
3db05fea 1556static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1557 enum ip_conntrack_info ctinfo,
1558 unsigned char **data, LocationRequest *lrq)
1559{
1560 typeof(set_ras_addr_hook) set_ras_addr;
1561
0d53778e 1562 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1563
1564 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1565 if (set_ras_addr && ct->status & IPS_NAT_MASK)
3db05fea 1566 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1567 &lrq->replyAddress, 1);
1568 return 0;
1569}
1570
1571/****************************************************************************/
3db05fea 1572static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1573 enum ip_conntrack_info ctinfo,
1574 unsigned char **data, LocationConfirm *lcf)
1575{
1576 int dir = CTINFO2DIR(ctinfo);
1577 int ret = 0;
1578 __be16 port;
1579 union nf_conntrack_address addr;
1580 struct nf_conntrack_expect *exp;
1581
0d53778e 1582 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1583
1584 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1585 &addr, &port))
1586 return 0;
1587
1588 /* Need new expect for call signal */
6823645d 1589 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1590 return -1;
6823645d
PM		 1591 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1592 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1593 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1594 exp->flags = NF_CT_EXPECT_PERMANENT;
1595 exp->helper = nf_conntrack_helper_q931;
1596
6823645d 1597 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1598 pr_debug("nf_ct_ras: expect Q.931 ");
f587de0e
PM		 1599 NF_CT_DUMP_TUPLE(&exp->tuple);
1600 } else
1601 ret = -1;
1602
6823645d 1603 nf_ct_expect_put(exp);
f587de0e
PM		 1604
1605 /* Ignore rasAddress */
1606
1607 return ret;
1608}
1609
1610/****************************************************************************/
3db05fea 1611static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1612 enum ip_conntrack_info ctinfo,
1613 unsigned char **data, InfoRequestResponse *irr)
1614{
1615 int ret;
1616 typeof(set_ras_addr_hook) set_ras_addr;
1617 typeof(set_sig_addr_hook) set_sig_addr;
1618
0d53778e 1619 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1620
1621 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1622 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1623 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1624 &irr->rasAddress, 1);
1625 if (ret < 0)
1626 return -1;
1627 }
1628
1629 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1630 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1631 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1632 irr->callSignalAddress.item,
1633 irr->callSignalAddress.count);
1634 if (ret < 0)
1635 return -1;
1636 }
1637
1638 return 0;
1639}
1640
1641/****************************************************************************/
3db05fea 1642static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1643 enum ip_conntrack_info ctinfo,
1644 unsigned char **data, RasMessage *ras)
1645{
1646 switch (ras->choice) {
1647 case eRasMessage_gatekeeperRequest:
3db05fea 1648 return process_grq(skb, ct, ctinfo, data,
f587de0e
PM		 1649 &ras->gatekeeperRequest);
1650 case eRasMessage_gatekeeperConfirm:
3db05fea 1651 return process_gcf(skb, ct, ctinfo, data,
f587de0e
PM		 1652 &ras->gatekeeperConfirm);
1653 case eRasMessage_registrationRequest:
3db05fea 1654 return process_rrq(skb, ct, ctinfo, data,
f587de0e
PM		 1655 &ras->registrationRequest);
1656 case eRasMessage_registrationConfirm:
3db05fea 1657 return process_rcf(skb, ct, ctinfo, data,
f587de0e
PM		 1658 &ras->registrationConfirm);
1659 case eRasMessage_unregistrationRequest:
3db05fea 1660 return process_urq(skb, ct, ctinfo, data,
f587de0e
PM		 1661 &ras->unregistrationRequest);
1662 case eRasMessage_admissionRequest:
3db05fea 1663 return process_arq(skb, ct, ctinfo, data,
f587de0e
PM		 1664 &ras->admissionRequest);
1665 case eRasMessage_admissionConfirm:
3db05fea 1666 return process_acf(skb, ct, ctinfo, data,
f587de0e
PM		 1667 &ras->admissionConfirm);
1668 case eRasMessage_locationRequest:
3db05fea 1669 return process_lrq(skb, ct, ctinfo, data,
f587de0e
PM		 1670 &ras->locationRequest);
1671 case eRasMessage_locationConfirm:
3db05fea 1672 return process_lcf(skb, ct, ctinfo, data,
f587de0e
PM		 1673 &ras->locationConfirm);
1674 case eRasMessage_infoRequestResponse:
3db05fea 1675 return process_irr(skb, ct, ctinfo, data,
f587de0e
PM		 1676 &ras->infoRequestResponse);
1677 default:
0d53778e 1678 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1679 break;
1680 }
1681
1682 return 0;
1683}
1684
1685/****************************************************************************/
3db05fea 1686static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1687 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1688{
1689 static RasMessage ras;
1690 unsigned char *data;
1691 int datalen = 0;
1692 int ret;
1693
3db05fea 1694 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1695
1696 spin_lock_bh(&nf_h323_lock);
1697
1698 /* Get UDP data */
3db05fea 1699 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1700 if (data == NULL)
1701 goto accept;
0d53778e 1702 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
f587de0e
PM		 1703 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1704
1705 /* Decode RAS message */
1706 ret = DecodeRasMessage(data, datalen, &ras);
1707 if (ret < 0) {
0d53778e
PM		 1708 pr_debug("nf_ct_ras: decoding error: %s\n",
1709 ret == H323_ERROR_BOUND ?
1710 "out of bound" : "out of range");
f587de0e
PM		 1711 goto accept;
1712 }
1713
1714 /* Process RAS message */
3db05fea 1715 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
f587de0e
PM		 1716 goto drop;
1717
1718 accept:
1719 spin_unlock_bh(&nf_h323_lock);
1720 return NF_ACCEPT;
1721
1722 drop:
1723 spin_unlock_bh(&nf_h323_lock);
1724 if (net_ratelimit())
1725 printk("nf_ct_ras: packet dropped\n");
1726 return NF_DROP;
1727}
1728
1729/****************************************************************************/
1730static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1731 {
1732 .name = "RAS",
1733 .me = THIS_MODULE,
1734 .max_expected = 32,
1735 .timeout = 240,
1736 .tuple.src.l3num = AF_INET,
1737 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1738 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 1739 .help = ras_help,
1740 },
1741 {
1742 .name = "RAS",
1743 .me = THIS_MODULE,
1744 .max_expected = 32,
1745 .timeout = 240,
1746 .tuple.src.l3num = AF_INET6,
1747 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1748 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e
PM		 1749 .help = ras_help,
1750 },
1751};
1752
1753/****************************************************************************/
1754static void __exit nf_conntrack_h323_fini(void)
1755{
1756 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1757 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1758 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1759 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1760 kfree(h323_buffer);
0d53778e 1761 pr_debug("nf_ct_h323: fini\n");
f587de0e
PM		 1762}
1763
1764/****************************************************************************/
1765static int __init nf_conntrack_h323_init(void)
1766{
1767 int ret;
1768
1769 h323_buffer = kmalloc(65536, GFP_KERNEL);
1770 if (!h323_buffer)
1771 return -ENOMEM;
1772 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1773 if (ret < 0)
1774 goto err1;
1775 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1776 if (ret < 0)
1777 goto err2;
1778 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1779 if (ret < 0)
1780 goto err3;
1781 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1782 if (ret < 0)
1783 goto err4;
0d53778e 1784 pr_debug("nf_ct_h323: init success\n");
f587de0e
PM		 1785 return 0;
1786
1787err4:
1788 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1789err3:
1790 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1791err2:
1792 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1793err1:
1794 return ret;
1795}
1796
1797/****************************************************************************/
1798module_init(nf_conntrack_h323_init);
1799module_exit(nf_conntrack_h323_fini);
1800
1801EXPORT_SYMBOL_GPL(get_h225_addr);
1802EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1803EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1804EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1805EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1806EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1807EXPORT_SYMBOL_GPL(nat_t120_hook);
1808EXPORT_SYMBOL_GPL(nat_h245_hook);
1809EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1810EXPORT_SYMBOL_GPL(nat_q931_hook);
1811
1812MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1813MODULE_DESCRIPTION("H.323 connection tracking helper");
1814MODULE_LICENSE("GPL");
1815MODULE_ALIAS("ip_conntrack_h323");
Clone of davem's net-next-2.6 tree