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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-2.6-block.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>
5a0e3ad6 20#include <linux/slab.h>
f587de0e
PM		 21#include <linux/udp.h>
22#include <linux/tcp.h>
23#include <linux/skbuff.h>
24#include <net/route.h>
25#include <net/ip6_route.h>
26
27#include <net/netfilter/nf_conntrack.h>
28#include <net/netfilter/nf_conntrack_core.h>
29#include <net/netfilter/nf_conntrack_tuple.h>
30#include <net/netfilter/nf_conntrack_expect.h>
31#include <net/netfilter/nf_conntrack_ecache.h>
32#include <net/netfilter/nf_conntrack_helper.h>
5d0aa2cc 33#include <net/netfilter/nf_conntrack_zones.h>
f587de0e
PM		 34#include <linux/netfilter/nf_conntrack_h323.h>
35
f587de0e
PM		 36/* Parameters */
37static unsigned int default_rrq_ttl __read_mostly = 300;
38module_param(default_rrq_ttl, uint, 0600);
39MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
40
41static int gkrouted_only __read_mostly = 1;
42module_param(gkrouted_only, int, 0600);
43MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
44
45static int callforward_filter __read_mostly = 1;
46module_param(callforward_filter, bool, 0600);
47MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
601e68e1 48 "if both endpoints are on different sides "
f587de0e
PM		 49 "(determined by routing information)");
50
51/* Hooks for NAT */
3db05fea 52int (*set_h245_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 53 unsigned char **data, int dataoff,
54 H245_TransportAddress *taddr,
643a2c15 55 union nf_inet_addr *addr, __be16 port)
f587de0e 56 __read_mostly;
3db05fea 57int (*set_h225_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 58 unsigned char **data, int dataoff,
59 TransportAddress *taddr,
643a2c15 60 union nf_inet_addr *addr, __be16 port)
f587de0e 61 __read_mostly;
3db05fea 62int (*set_sig_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 63 struct nf_conn *ct,
64 enum ip_conntrack_info ctinfo,
65 unsigned char **data,
66 TransportAddress *taddr, int count) __read_mostly;
3db05fea 67int (*set_ras_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 68 struct nf_conn *ct,
69 enum ip_conntrack_info ctinfo,
70 unsigned char **data,
71 TransportAddress *taddr, int count) __read_mostly;
3db05fea 72int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
f587de0e
PM		 73 struct nf_conn *ct,
74 enum ip_conntrack_info ctinfo,
75 unsigned char **data, int dataoff,
76 H245_TransportAddress *taddr,
77 __be16 port, __be16 rtp_port,
78 struct nf_conntrack_expect *rtp_exp,
79 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
3db05fea 80int (*nat_t120_hook) (struct sk_buff *skb,
f587de0e
PM		 81 struct nf_conn *ct,
82 enum ip_conntrack_info ctinfo,
83 unsigned char **data, int dataoff,
84 H245_TransportAddress *taddr, __be16 port,
85 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 86int (*nat_h245_hook) (struct sk_buff *skb,
f587de0e
PM		 87 struct nf_conn *ct,
88 enum ip_conntrack_info ctinfo,
89 unsigned char **data, int dataoff,
90 TransportAddress *taddr, __be16 port,
91 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 92int (*nat_callforwarding_hook) (struct sk_buff *skb,
f587de0e
PM		 93 struct nf_conn *ct,
94 enum ip_conntrack_info ctinfo,
95 unsigned char **data, int dataoff,
96 TransportAddress *taddr, __be16 port,
97 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 98int (*nat_q931_hook) (struct sk_buff *skb,
f587de0e
PM		 99 struct nf_conn *ct,
100 enum ip_conntrack_info ctinfo,
101 unsigned char **data, TransportAddress *taddr, int idx,
102 __be16 port, struct nf_conntrack_expect *exp)
103 __read_mostly;
104
105static DEFINE_SPINLOCK(nf_h323_lock);
106static char *h323_buffer;
107
108static struct nf_conntrack_helper nf_conntrack_helper_h245;
109static struct nf_conntrack_helper nf_conntrack_helper_q931[];
110static struct nf_conntrack_helper nf_conntrack_helper_ras[];
111
112/****************************************************************************/
3db05fea 113static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 114 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
115 unsigned char **data, int *datalen, int *dataoff)
116{
117 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
118 int dir = CTINFO2DIR(ctinfo);
905e3e8e
JE		 119 const struct tcphdr *th;
120 struct tcphdr _tcph;
f587de0e
PM		 121 int tcpdatalen;
122 int tcpdataoff;
123 unsigned char *tpkt;
124 int tpktlen;
125 int tpktoff;
126
127 /* Get TCP header */
3db05fea 128 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
f587de0e
PM		 129 if (th == NULL)
130 return 0;
131
132 /* Get TCP data offset */
133 tcpdataoff = protoff + th->doff * 4;
134
135 /* Get TCP data length */
3db05fea 136 tcpdatalen = skb->len - tcpdataoff;
f587de0e
PM		 137 if (tcpdatalen <= 0) /* No TCP data */
138 goto clear_out;
139
140 if (*data == NULL) { /* first TPKT */
141 /* Get first TPKT pointer */
3db05fea 142 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
f587de0e
PM		 143 h323_buffer);
144 BUG_ON(tpkt == NULL);
145
146 /* Validate TPKT identifier */
147 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
148 /* Netmeeting sends TPKT header and data separately */
149 if (info->tpkt_len[dir] > 0) {
0d53778e
PM		 150 pr_debug("nf_ct_h323: previous packet "
151 "indicated separate TPKT data of %hu "
152 "bytes\n", info->tpkt_len[dir]);
f587de0e
PM		 153 if (info->tpkt_len[dir] <= tcpdatalen) {
154 /* Yes, there was a TPKT header
155 * received */
156 *data = tpkt;
157 *datalen = info->tpkt_len[dir];
158 *dataoff = 0;
159 goto out;
160 }
161
162 /* Fragmented TPKT */
0d53778e 163 pr_debug("nf_ct_h323: fragmented TPKT\n");
f587de0e
PM		 164 goto clear_out;
165 }
166
167 /* It is not even a TPKT */
168 return 0;
169 }
170 tpktoff = 0;
171 } else { /* Next TPKT */
172 tpktoff = *dataoff + *datalen;
173 tcpdatalen -= tpktoff;
174 if (tcpdatalen <= 4) /* No more TPKT */
175 goto clear_out;
176 tpkt = *data + *datalen;
177
178 /* Validate TPKT identifier */
179 if (tpkt[0] != 0x03 || tpkt[1] != 0)
180 goto clear_out;
181 }
182
183 /* Validate TPKT length */
184 tpktlen = tpkt[2] * 256 + tpkt[3];
185 if (tpktlen < 4)
186 goto clear_out;
187 if (tpktlen > tcpdatalen) {
188 if (tcpdatalen == 4) { /* Separate TPKT header */
189 /* Netmeeting sends TPKT header and data separately */
0d53778e
PM		 190 pr_debug("nf_ct_h323: separate TPKT header indicates "
191 "there will be TPKT data of %hu bytes\n",
192 tpktlen - 4);
f587de0e
PM		 193 info->tpkt_len[dir] = tpktlen - 4;
194 return 0;
195 }
196
197 if (net_ratelimit())
198 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
199 goto clear_out;
200 }
201
202 /* This is the encapsulated data */
203 *data = tpkt + 4;
204 *datalen = tpktlen - 4;
205 *dataoff = tpktoff + 4;
206
207 out:
208 /* Clear TPKT length */
209 info->tpkt_len[dir] = 0;
210 return 1;
211
212 clear_out:
213 info->tpkt_len[dir] = 0;
214 return 0;
215}
216
217/****************************************************************************/
905e3e8e 218static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
f587de0e 219 H245_TransportAddress *taddr,
643a2c15 220 union nf_inet_addr *addr, __be16 *port)
f587de0e 221{
905e3e8e 222 const unsigned char *p;
f587de0e
PM		 223 int len;
224
225 if (taddr->choice != eH245_TransportAddress_unicastAddress)
226 return 0;
227
228 switch (taddr->unicastAddress.choice) {
229 case eUnicastAddress_iPAddress:
5e8fbe2a 230 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 231 return 0;
232 p = data + taddr->unicastAddress.iPAddress.network;
233 len = 4;
234 break;
235 case eUnicastAddress_iP6Address:
5e8fbe2a 236 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e
PM		 237 return 0;
238 p = data + taddr->unicastAddress.iP6Address.network;
239 len = 16;
240 break;
241 default:
242 return 0;
243 }
244
245 memcpy(addr, p, len);
246 memset((void *)addr + len, 0, sizeof(*addr) - len);
247 memcpy(port, p + len, sizeof(__be16));
248
249 return 1;
250}
251
252/****************************************************************************/
3db05fea 253static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 254 enum ip_conntrack_info ctinfo,
255 unsigned char **data, int dataoff,
256 H245_TransportAddress *taddr)
257{
258 int dir = CTINFO2DIR(ctinfo);
259 int ret = 0;
260 __be16 port;
261 __be16 rtp_port, rtcp_port;
643a2c15 262 union nf_inet_addr addr;
f587de0e
PM		 263 struct nf_conntrack_expect *rtp_exp;
264 struct nf_conntrack_expect *rtcp_exp;
265 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
266
267 /* Read RTP or RTCP address */
268 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
269 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
270 port == 0)
271 return 0;
272
273 /* RTP port is even */
274 port &= htons(~1);
275 rtp_port = port;
276 rtcp_port = htons(ntohs(port) + 1);
277
278 /* Create expect for RTP */
6823645d 279 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 280 return -1;
5e8fbe2a 281 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 282 &ct->tuplehash[!dir].tuple.src.u3,
283 &ct->tuplehash[!dir].tuple.dst.u3,
284 IPPROTO_UDP, NULL, &rtp_port);
f587de0e
PM		 285
286 /* Create expect for RTCP */
6823645d
PM		 287 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
288 nf_ct_expect_put(rtp_exp);
f587de0e
PM		 289 return -1;
290 }
5e8fbe2a 291 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 292 &ct->tuplehash[!dir].tuple.src.u3,
293 &ct->tuplehash[!dir].tuple.dst.u3,
294 IPPROTO_UDP, NULL, &rtcp_port);
f587de0e
PM		 295
296 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
601e68e1 297 &ct->tuplehash[!dir].tuple.dst.u3,
f587de0e
PM		 298 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
299 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
300 ct->status & IPS_NAT_MASK) {
301 /* NAT needed */
3db05fea 302 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 303 taddr, port, rtp_port, rtp_exp, rtcp_exp);
304 } else { /* Conntrack only */
6823645d
PM		 305 if (nf_ct_expect_related(rtp_exp) == 0) {
306 if (nf_ct_expect_related(rtcp_exp) == 0) {
0d53778e 307 pr_debug("nf_ct_h323: expect RTP ");
3c9fba65 308 nf_ct_dump_tuple(&rtp_exp->tuple);
0d53778e 309 pr_debug("nf_ct_h323: expect RTCP ");
3c9fba65 310 nf_ct_dump_tuple(&rtcp_exp->tuple);
f587de0e 311 } else {
6823645d 312 nf_ct_unexpect_related(rtp_exp);
f587de0e
PM		 313 ret = -1;
314 }
315 } else
316 ret = -1;
317 }
318
6823645d
PM		 319 nf_ct_expect_put(rtp_exp);
320 nf_ct_expect_put(rtcp_exp);
f587de0e
PM		 321
322 return ret;
323}
324
325/****************************************************************************/
3db05fea 326static int expect_t120(struct sk_buff *skb,
f587de0e
PM		 327 struct nf_conn *ct,
328 enum ip_conntrack_info ctinfo,
329 unsigned char **data, int dataoff,
330 H245_TransportAddress *taddr)
331{
332 int dir = CTINFO2DIR(ctinfo);
333 int ret = 0;
334 __be16 port;
643a2c15 335 union nf_inet_addr addr;
f587de0e
PM		 336 struct nf_conntrack_expect *exp;
337 typeof(nat_t120_hook) nat_t120;
338
339 /* Read T.120 address */
340 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
341 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
342 port == 0)
343 return 0;
344
345 /* Create expect for T.120 connections */
6823645d 346 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 347 return -1;
5e8fbe2a 348 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 349 &ct->tuplehash[!dir].tuple.src.u3,
350 &ct->tuplehash[!dir].tuple.dst.u3,
351 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 352 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
353
354 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
355 &ct->tuplehash[!dir].tuple.dst.u3,
356 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
357 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
358 ct->status & IPS_NAT_MASK) {
359 /* NAT needed */
3db05fea 360 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 361 port, exp);
362 } else { /* Conntrack only */
6823645d 363 if (nf_ct_expect_related(exp) == 0) {
0d53778e 364 pr_debug("nf_ct_h323: expect T.120 ");
3c9fba65 365 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 366 } else
367 ret = -1;
368 }
369
6823645d 370 nf_ct_expect_put(exp);
f587de0e
PM		 371
372 return ret;
373}
374
375/****************************************************************************/
3db05fea 376static int process_h245_channel(struct sk_buff *skb,
f587de0e
PM		 377 struct nf_conn *ct,
378 enum ip_conntrack_info ctinfo,
379 unsigned char **data, int dataoff,
380 H2250LogicalChannelParameters *channel)
381{
382 int ret;
383
384 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
385 /* RTP */
3db05fea 386 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 387 &channel->mediaChannel);
388 if (ret < 0)
389 return -1;
390 }
391
392 if (channel->
393 options & eH2250LogicalChannelParameters_mediaControlChannel) {
394 /* RTCP */
3db05fea 395 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 396 &channel->mediaControlChannel);
397 if (ret < 0)
398 return -1;
399 }
400
401 return 0;
402}
403
404/****************************************************************************/
3db05fea 405static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 406 enum ip_conntrack_info ctinfo,
407 unsigned char **data, int dataoff,
408 OpenLogicalChannel *olc)
409{
410 int ret;
411
0d53778e 412 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
f587de0e
PM		 413
414 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
415 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
416 {
3db05fea 417 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 418 &olc->
419 forwardLogicalChannelParameters.
420 multiplexParameters.
421 h2250LogicalChannelParameters);
422 if (ret < 0)
423 return -1;
424 }
425
426 if ((olc->options &
427 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
428 (olc->reverseLogicalChannelParameters.options &
429 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
430 && (olc->reverseLogicalChannelParameters.multiplexParameters.
431 choice ==
432 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
433 {
434 ret =
3db05fea 435 process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 436 &olc->
437 reverseLogicalChannelParameters.
438 multiplexParameters.
439 h2250LogicalChannelParameters);
440 if (ret < 0)
441 return -1;
442 }
443
444 if ((olc->options & eOpenLogicalChannel_separateStack) &&
445 olc->forwardLogicalChannelParameters.dataType.choice ==
446 eDataType_data &&
447 olc->forwardLogicalChannelParameters.dataType.data.application.
448 choice == eDataApplicationCapability_application_t120 &&
449 olc->forwardLogicalChannelParameters.dataType.data.application.
450 t120.choice == eDataProtocolCapability_separateLANStack &&
451 olc->separateStack.networkAddress.choice ==
452 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 453 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 454 &olc->separateStack.networkAddress.
455 localAreaAddress);
456 if (ret < 0)
457 return -1;
458 }
459
460 return 0;
461}
462
463/****************************************************************************/
3db05fea 464static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 465 enum ip_conntrack_info ctinfo,
466 unsigned char **data, int dataoff,
467 OpenLogicalChannelAck *olca)
468{
469 H2250LogicalChannelAckParameters *ack;
470 int ret;
471
0d53778e 472 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
f587de0e
PM		 473
474 if ((olca->options &
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
476 (olca->reverseLogicalChannelParameters.options &
477 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
478 && (olca->reverseLogicalChannelParameters.multiplexParameters.
479 choice ==
480 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
481 {
3db05fea 482 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 483 &olca->
484 reverseLogicalChannelParameters.
485 multiplexParameters.
486 h2250LogicalChannelParameters);
487 if (ret < 0)
488 return -1;
489 }
490
491 if ((olca->options &
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
493 (olca->forwardMultiplexAckParameters.choice ==
494 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
495 {
496 ack = &olca->forwardMultiplexAckParameters.
497 h2250LogicalChannelAckParameters;
498 if (ack->options &
499 eH2250LogicalChannelAckParameters_mediaChannel) {
500 /* RTP */
3db05fea 501 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 502 &ack->mediaChannel);
503 if (ret < 0)
504 return -1;
505 }
506
507 if (ack->options &
508 eH2250LogicalChannelAckParameters_mediaControlChannel) {
509 /* RTCP */
3db05fea 510 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 511 &ack->mediaControlChannel);
512 if (ret < 0)
513 return -1;
514 }
515 }
516
f8f1c08e
JMZ		 517 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
518 olca->separateStack.networkAddress.choice ==
519 eNetworkAccessParameters_networkAddress_localAreaAddress) {
3db05fea 520 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
f8f1c08e
JMZ		 521 &olca->separateStack.networkAddress.
522 localAreaAddress);
523 if (ret < 0)
524 return -1;
525 }
526
f587de0e
PM		 527 return 0;
528}
529
530/****************************************************************************/
3db05fea 531static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 532 enum ip_conntrack_info ctinfo,
533 unsigned char **data, int dataoff,
534 MultimediaSystemControlMessage *mscm)
535{
536 switch (mscm->choice) {
537 case eMultimediaSystemControlMessage_request:
538 if (mscm->request.choice ==
539 eRequestMessage_openLogicalChannel) {
3db05fea 540 return process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 541 &mscm->request.openLogicalChannel);
542 }
0d53778e
PM		 543 pr_debug("nf_ct_h323: H.245 Request %d\n",
544 mscm->request.choice);
f587de0e
PM		 545 break;
546 case eMultimediaSystemControlMessage_response:
547 if (mscm->response.choice ==
548 eResponseMessage_openLogicalChannelAck) {
3db05fea 549 return process_olca(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 550 &mscm->response.
551 openLogicalChannelAck);
552 }
0d53778e
PM		 553 pr_debug("nf_ct_h323: H.245 Response %d\n",
554 mscm->response.choice);
f587de0e
PM		 555 break;
556 default:
0d53778e 557 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
f587de0e
PM		 558 break;
559 }
560
561 return 0;
562}
563
564/****************************************************************************/
3db05fea 565static int h245_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 566 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
567{
568 static MultimediaSystemControlMessage mscm;
569 unsigned char *data = NULL;
570 int datalen;
571 int dataoff;
572 int ret;
573
574 /* Until there's been traffic both ways, don't look in packets. */
575 if (ctinfo != IP_CT_ESTABLISHED &&
576 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
577 return NF_ACCEPT;
578 }
3db05fea 579 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
f587de0e
PM		 580
581 spin_lock_bh(&nf_h323_lock);
582
583 /* Process each TPKT */
3db05fea 584 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 585 &data, &datalen, &dataoff)) {
0d53778e 586 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
3c9fba65 587 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 588
589 /* Decode H.245 signal */
590 ret = DecodeMultimediaSystemControlMessage(data, datalen,
591 &mscm);
592 if (ret < 0) {
0d53778e
PM		 593 pr_debug("nf_ct_h245: decoding error: %s\n",
594 ret == H323_ERROR_BOUND ?
595 "out of bound" : "out of range");
f587de0e
PM		 596 /* We don't drop when decoding error */
597 break;
598 }
599
600 /* Process H.245 signal */
3db05fea 601 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
f587de0e
PM		 602 goto drop;
603 }
604
605 spin_unlock_bh(&nf_h323_lock);
606 return NF_ACCEPT;
607
608 drop:
609 spin_unlock_bh(&nf_h323_lock);
610 if (net_ratelimit())
611 printk("nf_ct_h245: packet dropped\n");
612 return NF_DROP;
613}
614
615/****************************************************************************/
6002f266
PM		 616static const struct nf_conntrack_expect_policy h245_exp_policy = {
617 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
618 .timeout = 240,
619};
620
f587de0e
PM		 621static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
622 .name = "H.245",
623 .me = THIS_MODULE,
a56b8f81 624 .tuple.src.l3num = AF_UNSPEC,
f587de0e 625 .tuple.dst.protonum = IPPROTO_UDP,
6002f266
PM		 626 .help = h245_help,
627 .expect_policy = &h245_exp_policy,
f587de0e
PM		 628};
629
630/****************************************************************************/
631int get_h225_addr(struct nf_conn *ct, unsigned char *data,
632 TransportAddress *taddr,
643a2c15 633 union nf_inet_addr *addr, __be16 *port)
f587de0e 634{
905e3e8e 635 const unsigned char *p;
f587de0e
PM		 636 int len;
637
638 switch (taddr->choice) {
639 case eTransportAddress_ipAddress:
5e8fbe2a 640 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 641 return 0;
642 p = data + taddr->ipAddress.ip;
643 len = 4;
644 break;
645 case eTransportAddress_ip6Address:
5e8fbe2a 646 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e 647 return 0;
bb807245 648 p = data + taddr->ip6Address.ip;
f587de0e
PM		 649 len = 16;
650 break;
651 default:
652 return 0;
653 }
654
655 memcpy(addr, p, len);
656 memset((void *)addr + len, 0, sizeof(*addr) - len);
657 memcpy(port, p + len, sizeof(__be16));
658
659 return 1;
660}
661
662/****************************************************************************/
3db05fea 663static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 664 enum ip_conntrack_info ctinfo,
665 unsigned char **data, int dataoff,
666 TransportAddress *taddr)
667{
668 int dir = CTINFO2DIR(ctinfo);
669 int ret = 0;
670 __be16 port;
643a2c15 671 union nf_inet_addr addr;
f587de0e
PM		 672 struct nf_conntrack_expect *exp;
673 typeof(nat_h245_hook) nat_h245;
674
675 /* Read h245Address */
676 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
677 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
678 port == 0)
679 return 0;
680
681 /* Create expect for h245 connection */
6823645d 682 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 683 return -1;
5e8fbe2a 684 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 685 &ct->tuplehash[!dir].tuple.src.u3,
686 &ct->tuplehash[!dir].tuple.dst.u3,
687 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 688 exp->helper = &nf_conntrack_helper_h245;
689
690 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
691 &ct->tuplehash[!dir].tuple.dst.u3,
692 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
693 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
694 ct->status & IPS_NAT_MASK) {
695 /* NAT needed */
3db05fea 696 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 697 port, exp);
698 } else { /* Conntrack only */
6823645d 699 if (nf_ct_expect_related(exp) == 0) {
0d53778e 700 pr_debug("nf_ct_q931: expect H.245 ");
3c9fba65 701 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 702 } else
703 ret = -1;
704 }
705
6823645d 706 nf_ct_expect_put(exp);
f587de0e
PM		 707
708 return ret;
709}
710
711/* If the calling party is on the same side of the forward-to party,
712 * we don't need to track the second call */
905e3e8e 713static int callforward_do_filter(const union nf_inet_addr *src,
76108cea
JE		 714 const union nf_inet_addr *dst,
715 u_int8_t family)
f587de0e 716{
1e796fda 717 const struct nf_afinfo *afinfo;
f587de0e
PM		 718 struct flowi fl1, fl2;
719 int ret = 0;
720
1841a4c7
PM		 721 /* rcu_read_lock()ed by nf_hook_slow() */
722 afinfo = nf_get_afinfo(family);
723 if (!afinfo)
724 return 0;
725
f587de0e
PM		 726 memset(&fl1, 0, sizeof(fl1));
727 memset(&fl2, 0, sizeof(fl2));
728
729 switch (family) {
730 case AF_INET: {
731 struct rtable *rt1, *rt2;
732
733 fl1.fl4_dst = src->ip;
734 fl2.fl4_dst = dst->ip;
1841a4c7
PM		 735 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
736 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
f587de0e
PM		 737 if (rt1->rt_gateway == rt2->rt_gateway &&
738 rt1->u.dst.dev == rt2->u.dst.dev)
739 ret = 1;
740 dst_release(&rt2->u.dst);
741 }
742 dst_release(&rt1->u.dst);
743 }
744 break;
745 }
1841a4c7
PM		 746#if defined(CONFIG_NF_CONNTRACK_IPV6) || \
747 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
f587de0e
PM		 748 case AF_INET6: {
749 struct rt6_info *rt1, *rt2;
750
751 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
752 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
1841a4c7
PM		 753 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
754 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
f587de0e 755 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
601e68e1 756 sizeof(rt1->rt6i_gateway)) &&
f587de0e
PM		 757 rt1->u.dst.dev == rt2->u.dst.dev)
758 ret = 1;
759 dst_release(&rt2->u.dst);
760 }
761 dst_release(&rt1->u.dst);
762 }
763 break;
764 }
765#endif
766 }
767 return ret;
768
769}
770
771/****************************************************************************/
3db05fea 772static int expect_callforwarding(struct sk_buff *skb,
f587de0e
PM		 773 struct nf_conn *ct,
774 enum ip_conntrack_info ctinfo,
775 unsigned char **data, int dataoff,
776 TransportAddress *taddr)
777{
778 int dir = CTINFO2DIR(ctinfo);
779 int ret = 0;
780 __be16 port;
643a2c15 781 union nf_inet_addr addr;
f587de0e
PM		 782 struct nf_conntrack_expect *exp;
783 typeof(nat_callforwarding_hook) nat_callforwarding;
784
785 /* Read alternativeAddress */
786 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
787 return 0;
788
789 /* If the calling party is on the same side of the forward-to party,
790 * we don't need to track the second call */
791 if (callforward_filter &&
792 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
5e8fbe2a 793 nf_ct_l3num(ct))) {
0d53778e 794 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
f587de0e
PM		 795 return 0;
796 }
797
798 /* Create expect for the second call leg */
6823645d 799 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 800 return -1;
5e8fbe2a 801 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 802 &ct->tuplehash[!dir].tuple.src.u3, &addr,
803 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 804 exp->helper = nf_conntrack_helper_q931;
805
806 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
807 &ct->tuplehash[!dir].tuple.dst.u3,
808 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
809 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
810 ct->status & IPS_NAT_MASK) {
811 /* Need NAT */
3db05fea 812 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 813 taddr, port, exp);
814 } else { /* Conntrack only */
6823645d 815 if (nf_ct_expect_related(exp) == 0) {
0d53778e 816 pr_debug("nf_ct_q931: expect Call Forwarding ");
3c9fba65 817 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 818 } else
819 ret = -1;
820 }
821
6823645d 822 nf_ct_expect_put(exp);
f587de0e
PM		 823
824 return ret;
825}
826
827/****************************************************************************/
3db05fea 828static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 829 enum ip_conntrack_info ctinfo,
830 unsigned char **data, int dataoff,
831 Setup_UUIE *setup)
832{
833 int dir = CTINFO2DIR(ctinfo);
834 int ret;
835 int i;
836 __be16 port;
643a2c15 837 union nf_inet_addr addr;
f587de0e
PM		 838 typeof(set_h225_addr_hook) set_h225_addr;
839
0d53778e 840 pr_debug("nf_ct_q931: Setup\n");
f587de0e
PM		 841
842 if (setup->options & eSetup_UUIE_h245Address) {
3db05fea 843 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 844 &setup->h245Address);
845 if (ret < 0)
846 return -1;
847 }
848
849 set_h225_addr = rcu_dereference(set_h225_addr_hook);
850 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
6aebb9b2 851 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
f587de0e 852 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
601e68e1 853 &addr, &port) &&
f587de0e 854 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
5b095d98 855 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 856 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
0d53778e 857 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
3db05fea 858 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 859 &setup->destCallSignalAddress,
860 &ct->tuplehash[!dir].tuple.src.u3,
861 ct->tuplehash[!dir].tuple.src.u.tcp.port);
862 if (ret < 0)
863 return -1;
864 }
865
866 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
867 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
868 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
601e68e1 869 &addr, &port) &&
f587de0e 870 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
5b095d98 871 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 872 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
0d53778e 873 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
3db05fea 874 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 875 &setup->sourceCallSignalAddress,
876 &ct->tuplehash[!dir].tuple.dst.u3,
877 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
878 if (ret < 0)
879 return -1;
880 }
881
882 if (setup->options & eSetup_UUIE_fastStart) {
883 for (i = 0; i < setup->fastStart.count; i++) {
3db05fea 884 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 885 &setup->fastStart.item[i]);
886 if (ret < 0)
887 return -1;
888 }
889 }
890
891 return 0;
892}
893
894/****************************************************************************/
3db05fea 895static int process_callproceeding(struct sk_buff *skb,
f587de0e
PM		 896 struct nf_conn *ct,
897 enum ip_conntrack_info ctinfo,
898 unsigned char **data, int dataoff,
899 CallProceeding_UUIE *callproc)
900{
901 int ret;
902 int i;
903
0d53778e 904 pr_debug("nf_ct_q931: CallProceeding\n");
f587de0e
PM		 905
906 if (callproc->options & eCallProceeding_UUIE_h245Address) {
3db05fea 907 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 908 &callproc->h245Address);
909 if (ret < 0)
910 return -1;
911 }
912
913 if (callproc->options & eCallProceeding_UUIE_fastStart) {
914 for (i = 0; i < callproc->fastStart.count; i++) {
3db05fea 915 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 916 &callproc->fastStart.item[i]);
917 if (ret < 0)
918 return -1;
919 }
920 }
921
922 return 0;
923}
924
925/****************************************************************************/
3db05fea 926static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 927 enum ip_conntrack_info ctinfo,
928 unsigned char **data, int dataoff,
929 Connect_UUIE *connect)
930{
931 int ret;
932 int i;
933
0d53778e 934 pr_debug("nf_ct_q931: Connect\n");
f587de0e
PM		 935
936 if (connect->options & eConnect_UUIE_h245Address) {
3db05fea 937 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 938 &connect->h245Address);
939 if (ret < 0)
940 return -1;
941 }
942
943 if (connect->options & eConnect_UUIE_fastStart) {
944 for (i = 0; i < connect->fastStart.count; i++) {
3db05fea 945 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 946 &connect->fastStart.item[i]);
947 if (ret < 0)
948 return -1;
949 }
950 }
951
952 return 0;
953}
954
955/****************************************************************************/
3db05fea 956static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 957 enum ip_conntrack_info ctinfo,
958 unsigned char **data, int dataoff,
959 Alerting_UUIE *alert)
960{
961 int ret;
962 int i;
963
0d53778e 964 pr_debug("nf_ct_q931: Alerting\n");
f587de0e
PM		 965
966 if (alert->options & eAlerting_UUIE_h245Address) {
3db05fea 967 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 968 &alert->h245Address);
969 if (ret < 0)
970 return -1;
971 }
972
973 if (alert->options & eAlerting_UUIE_fastStart) {
974 for (i = 0; i < alert->fastStart.count; i++) {
3db05fea 975 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 976 &alert->fastStart.item[i]);
977 if (ret < 0)
978 return -1;
979 }
980 }
981
982 return 0;
983}
984
f587de0e 985/****************************************************************************/
3db05fea 986static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 987 enum ip_conntrack_info ctinfo,
988 unsigned char **data, int dataoff,
989 Facility_UUIE *facility)
990{
991 int ret;
992 int i;
993
0d53778e 994 pr_debug("nf_ct_q931: Facility\n");
f587de0e
PM		 995
996 if (facility->reason.choice == eFacilityReason_callForwarded) {
997 if (facility->options & eFacility_UUIE_alternativeAddress)
3db05fea 998 return expect_callforwarding(skb, ct, ctinfo, data,
f587de0e
PM		 999 dataoff,
1000 &facility->
1001 alternativeAddress);
1002 return 0;
1003 }
1004
1005 if (facility->options & eFacility_UUIE_h245Address) {
3db05fea 1006 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1007 &facility->h245Address);
1008 if (ret < 0)
1009 return -1;
1010 }
1011
1012 if (facility->options & eFacility_UUIE_fastStart) {
1013 for (i = 0; i < facility->fastStart.count; i++) {
3db05fea 1014 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1015 &facility->fastStart.item[i]);
1016 if (ret < 0)
1017 return -1;
1018 }
1019 }
1020
1021 return 0;
1022}
1023
1024/****************************************************************************/
3db05fea 1025static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1026 enum ip_conntrack_info ctinfo,
1027 unsigned char **data, int dataoff,
1028 Progress_UUIE *progress)
1029{
1030 int ret;
1031 int i;
1032
0d53778e 1033 pr_debug("nf_ct_q931: Progress\n");
f587de0e
PM		 1034
1035 if (progress->options & eProgress_UUIE_h245Address) {
3db05fea 1036 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1037 &progress->h245Address);
1038 if (ret < 0)
1039 return -1;
1040 }
1041
1042 if (progress->options & eProgress_UUIE_fastStart) {
1043 for (i = 0; i < progress->fastStart.count; i++) {
3db05fea 1044 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1045 &progress->fastStart.item[i]);
1046 if (ret < 0)
1047 return -1;
1048 }
1049 }
1050
1051 return 0;
1052}
1053
1054/****************************************************************************/
3db05fea 1055static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1056 enum ip_conntrack_info ctinfo,
1057 unsigned char **data, int dataoff, Q931 *q931)
1058{
1059 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1060 int i;
1061 int ret = 0;
1062
1063 switch (pdu->h323_message_body.choice) {
1064 case eH323_UU_PDU_h323_message_body_setup:
3db05fea 1065 ret = process_setup(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1066 &pdu->h323_message_body.setup);
1067 break;
1068 case eH323_UU_PDU_h323_message_body_callProceeding:
3db05fea 1069 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1070 &pdu->h323_message_body.
1071 callProceeding);
1072 break;
1073 case eH323_UU_PDU_h323_message_body_connect:
3db05fea 1074 ret = process_connect(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1075 &pdu->h323_message_body.connect);
1076 break;
1077 case eH323_UU_PDU_h323_message_body_alerting:
3db05fea 1078 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1079 &pdu->h323_message_body.alerting);
1080 break;
f587de0e 1081 case eH323_UU_PDU_h323_message_body_facility:
3db05fea 1082 ret = process_facility(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1083 &pdu->h323_message_body.facility);
1084 break;
1085 case eH323_UU_PDU_h323_message_body_progress:
3db05fea 1086 ret = process_progress(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1087 &pdu->h323_message_body.progress);
1088 break;
1089 default:
0d53778e
PM		 1090 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1091 pdu->h323_message_body.choice);
f587de0e
PM		 1092 break;
1093 }
1094
1095 if (ret < 0)
1096 return -1;
1097
1098 if (pdu->options & eH323_UU_PDU_h245Control) {
1099 for (i = 0; i < pdu->h245Control.count; i++) {
3db05fea 1100 ret = process_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1101 &pdu->h245Control.item[i]);
1102 if (ret < 0)
1103 return -1;
1104 }
1105 }
1106
1107 return 0;
1108}
1109
1110/****************************************************************************/
3db05fea 1111static int q931_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1112 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1113{
1114 static Q931 q931;
1115 unsigned char *data = NULL;
1116 int datalen;
1117 int dataoff;
1118 int ret;
1119
1120 /* Until there's been traffic both ways, don't look in packets. */
1121 if (ctinfo != IP_CT_ESTABLISHED &&
1122 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1123 return NF_ACCEPT;
1124 }
3db05fea 1125 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
f587de0e
PM		 1126
1127 spin_lock_bh(&nf_h323_lock);
1128
1129 /* Process each TPKT */
3db05fea 1130 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 1131 &data, &datalen, &dataoff)) {
0d53778e 1132 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
3c9fba65 1133 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1134
1135 /* Decode Q.931 signal */
1136 ret = DecodeQ931(data, datalen, &q931);
1137 if (ret < 0) {
0d53778e
PM		 1138 pr_debug("nf_ct_q931: decoding error: %s\n",
1139 ret == H323_ERROR_BOUND ?
1140 "out of bound" : "out of range");
f587de0e
PM		 1141 /* We don't drop when decoding error */
1142 break;
1143 }
1144
1145 /* Process Q.931 signal */
3db05fea 1146 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
f587de0e
PM		 1147 goto drop;
1148 }
1149
1150 spin_unlock_bh(&nf_h323_lock);
1151 return NF_ACCEPT;
1152
1153 drop:
1154 spin_unlock_bh(&nf_h323_lock);
1155 if (net_ratelimit())
1156 printk("nf_ct_q931: packet dropped\n");
1157 return NF_DROP;
1158}
1159
1160/****************************************************************************/
6002f266
PM		 1161static const struct nf_conntrack_expect_policy q931_exp_policy = {
1162 /* T.120 and H.245 */
1163 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1164 .timeout = 240,
1165};
1166
f587de0e
PM		 1167static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1168 {
1169 .name = "Q.931",
1170 .me = THIS_MODULE,
f587de0e 1171 .tuple.src.l3num = AF_INET,
09640e63 1172 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1173 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1174 .help = q931_help,
1175 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1176 },
1177 {
1178 .name = "Q.931",
1179 .me = THIS_MODULE,
f587de0e 1180 .tuple.src.l3num = AF_INET6,
09640e63 1181 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1182 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1183 .help = q931_help,
1184 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1185 },
1186};
1187
1188/****************************************************************************/
3db05fea 1189static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1190 int *datalen)
1191{
905e3e8e
JE		 1192 const struct udphdr *uh;
1193 struct udphdr _uh;
f587de0e
PM		 1194 int dataoff;
1195
3db05fea 1196 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1197 if (uh == NULL)
1198 return NULL;
1199 dataoff = protoff + sizeof(_uh);
3db05fea 1200 if (dataoff >= skb->len)
f587de0e 1201 return NULL;
3db05fea
HX		 1202 *datalen = skb->len - dataoff;
1203 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1204}
1205
1206/****************************************************************************/
1207static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
643a2c15 1208 union nf_inet_addr *addr,
f587de0e
PM		 1209 __be16 port)
1210{
84541cc1 1211 struct net *net = nf_ct_net(ct);
f587de0e
PM		 1212 struct nf_conntrack_expect *exp;
1213 struct nf_conntrack_tuple tuple;
1214
1215 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1216 tuple.src.u.tcp.port = 0;
1217 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1218 tuple.dst.u.tcp.port = port;
1219 tuple.dst.protonum = IPPROTO_TCP;
1220
5d0aa2cc 1221 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
f587de0e
PM		 1222 if (exp && exp->master == ct)
1223 return exp;
1224 return NULL;
1225}
1226
1227/****************************************************************************/
1228static int set_expect_timeout(struct nf_conntrack_expect *exp,
1229 unsigned timeout)
1230{
1231 if (!exp || !del_timer(&exp->timeout))
1232 return 0;
1233
1234 exp->timeout.expires = jiffies + timeout * HZ;
1235 add_timer(&exp->timeout);
1236
1237 return 1;
1238}
1239
1240/****************************************************************************/
3db05fea 1241static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1242 enum ip_conntrack_info ctinfo,
1243 unsigned char **data,
1244 TransportAddress *taddr, int count)
1245{
1246 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1247 int dir = CTINFO2DIR(ctinfo);
1248 int ret = 0;
1249 int i;
1250 __be16 port;
643a2c15 1251 union nf_inet_addr addr;
f587de0e
PM		 1252 struct nf_conntrack_expect *exp;
1253 typeof(nat_q931_hook) nat_q931;
1254
1255 /* Look for the first related address */
1256 for (i = 0; i < count; i++) {
1257 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1258 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1259 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1260 break;
1261 }
1262
1263 if (i >= count) /* Not found */
1264 return 0;
1265
1266 /* Create expect for Q.931 */
6823645d 1267 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1268 return -1;
5e8fbe2a 1269 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1270 gkrouted_only ? /* only accept calls from GK? */
1271 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1272 &ct->tuplehash[!dir].tuple.dst.u3,
1273 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1274 exp->helper = nf_conntrack_helper_q931;
1275 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1276
1277 nat_q931 = rcu_dereference(nat_q931_hook);
1278 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
3db05fea 1279 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
f587de0e 1280 } else { /* Conntrack only */
6823645d 1281 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1282 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1283 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1284
1285 /* Save port for looking up expect in processing RCF */
1286 info->sig_port[dir] = port;
1287 } else
1288 ret = -1;
1289 }
1290
6823645d 1291 nf_ct_expect_put(exp);
f587de0e
PM		 1292
1293 return ret;
1294}
1295
1296/****************************************************************************/
3db05fea 1297static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1298 enum ip_conntrack_info ctinfo,
1299 unsigned char **data, GatekeeperRequest *grq)
1300{
1301 typeof(set_ras_addr_hook) set_ras_addr;
1302
0d53778e 1303 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1304
1305 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1306 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
3db05fea 1307 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1308 &grq->rasAddress, 1);
1309 return 0;
1310}
1311
1312/****************************************************************************/
3db05fea 1313static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1314 enum ip_conntrack_info ctinfo,
1315 unsigned char **data, GatekeeperConfirm *gcf)
1316{
1317 int dir = CTINFO2DIR(ctinfo);
1318 int ret = 0;
1319 __be16 port;
643a2c15 1320 union nf_inet_addr addr;
f587de0e
PM		 1321 struct nf_conntrack_expect *exp;
1322
0d53778e 1323 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1324
1325 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1326 return 0;
1327
1328 /* Registration port is the same as discovery port */
1329 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1330 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1331 return 0;
1332
1333 /* Avoid RAS expectation loops. A GCF is never expected. */
1334 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1335 return 0;
1336
1337 /* Need new expect */
6823645d 1338 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1339 return -1;
5e8fbe2a 1340 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1341 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1342 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1343 exp->helper = nf_conntrack_helper_ras;
1344
6823645d 1345 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1346 pr_debug("nf_ct_ras: expect RAS ");
3c9fba65 1347 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1348 } else
1349 ret = -1;
1350
6823645d 1351 nf_ct_expect_put(exp);
f587de0e
PM		 1352
1353 return ret;
1354}
1355
1356/****************************************************************************/
3db05fea 1357static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1358 enum ip_conntrack_info ctinfo,
1359 unsigned char **data, RegistrationRequest *rrq)
1360{
1361 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1362 int ret;
1363 typeof(set_ras_addr_hook) set_ras_addr;
1364
0d53778e 1365 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1366
3db05fea 1367 ret = expect_q931(skb, ct, ctinfo, data,
f587de0e
PM		 1368 rrq->callSignalAddress.item,
1369 rrq->callSignalAddress.count);
1370 if (ret < 0)
1371 return -1;
1372
1373 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1374 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1375 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1376 rrq->rasAddress.item,
1377 rrq->rasAddress.count);
1378 if (ret < 0)
1379 return -1;
1380 }
1381
1382 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1383 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1384 info->timeout = rrq->timeToLive;
1385 } else
1386 info->timeout = default_rrq_ttl;
1387
1388 return 0;
1389}
1390
1391/****************************************************************************/
3db05fea 1392static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1393 enum ip_conntrack_info ctinfo,
1394 unsigned char **data, RegistrationConfirm *rcf)
1395{
1396 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1397 int dir = CTINFO2DIR(ctinfo);
1398 int ret;
1399 struct nf_conntrack_expect *exp;
1400 typeof(set_sig_addr_hook) set_sig_addr;
1401
0d53778e 1402 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1403
1404 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1405 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1406 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1407 rcf->callSignalAddress.item,
1408 rcf->callSignalAddress.count);
1409 if (ret < 0)
1410 return -1;
1411 }
1412
1413 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1414 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1415 info->timeout = rcf->timeToLive;
1416 }
1417
1418 if (info->timeout > 0) {
0d53778e
PM		 1419 pr_debug("nf_ct_ras: set RAS connection timeout to "
1420 "%u seconds\n", info->timeout);
3db05fea 1421 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1422
1423 /* Set expect timeout */
f8ba1aff 1424 spin_lock_bh(&nf_conntrack_lock);
f587de0e
PM		 1425 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1426 info->sig_port[!dir]);
1427 if (exp) {
0d53778e
PM		 1428 pr_debug("nf_ct_ras: set Q.931 expect "
1429 "timeout to %u seconds for",
1430 info->timeout);
3c9fba65 1431 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1432 set_expect_timeout(exp, info->timeout);
1433 }
f8ba1aff 1434 spin_unlock_bh(&nf_conntrack_lock);
f587de0e
PM		 1435 }
1436
1437 return 0;
1438}
1439
1440/****************************************************************************/
3db05fea 1441static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1442 enum ip_conntrack_info ctinfo,
1443 unsigned char **data, UnregistrationRequest *urq)
1444{
1445 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1446 int dir = CTINFO2DIR(ctinfo);
1447 int ret;
1448 typeof(set_sig_addr_hook) set_sig_addr;
1449
0d53778e 1450 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1451
1452 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1453 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1454 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1455 urq->callSignalAddress.item,
1456 urq->callSignalAddress.count);
1457 if (ret < 0)
1458 return -1;
1459 }
1460
1461 /* Clear old expect */
1462 nf_ct_remove_expectations(ct);
1463 info->sig_port[dir] = 0;
1464 info->sig_port[!dir] = 0;
1465
1466 /* Give it 30 seconds for UCF or URJ */
3db05fea 1467 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1468
1469 return 0;
1470}
1471
1472/****************************************************************************/
3db05fea 1473static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1474 enum ip_conntrack_info ctinfo,
1475 unsigned char **data, AdmissionRequest *arq)
1476{
905e3e8e 1477 const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
f587de0e
PM		 1478 int dir = CTINFO2DIR(ctinfo);
1479 __be16 port;
643a2c15 1480 union nf_inet_addr addr;
f587de0e
PM		 1481 typeof(set_h225_addr_hook) set_h225_addr;
1482
0d53778e 1483 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1484
1485 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1486 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1487 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1488 &addr, &port) &&
f587de0e
PM		 1489 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1490 port == info->sig_port[dir] &&
1491 set_h225_addr && ct->status & IPS_NAT_MASK) {
1492 /* Answering ARQ */
3db05fea 1493 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1494 &arq->destCallSignalAddress,
1495 &ct->tuplehash[!dir].tuple.dst.u3,
1496 info->sig_port[!dir]);
1497 }
1498
1499 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1500 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1501 &addr, &port) &&
f587de0e
PM		 1502 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1503 set_h225_addr && ct->status & IPS_NAT_MASK) {
1504 /* Calling ARQ */
3db05fea 1505 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1506 &arq->srcCallSignalAddress,
1507 &ct->tuplehash[!dir].tuple.dst.u3,
1508 port);
1509 }
1510
1511 return 0;
1512}
1513
1514/****************************************************************************/
3db05fea 1515static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1516 enum ip_conntrack_info ctinfo,
1517 unsigned char **data, AdmissionConfirm *acf)
1518{
1519 int dir = CTINFO2DIR(ctinfo);
1520 int ret = 0;
1521 __be16 port;
643a2c15 1522 union nf_inet_addr addr;
f587de0e
PM		 1523 struct nf_conntrack_expect *exp;
1524 typeof(set_sig_addr_hook) set_sig_addr;
1525
0d53778e 1526 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1527
1528 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1529 &addr, &port))
1530 return 0;
1531
1532 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1533 /* Answering ACF */
1534 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1535 if (set_sig_addr && ct->status & IPS_NAT_MASK)
3db05fea 1536 return set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1537 &acf->destCallSignalAddress, 1);
1538 return 0;
1539 }
1540
1541 /* Need new expect */
6823645d 1542 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1543 return -1;
5e8fbe2a 1544 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1545 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1546 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1547 exp->flags = NF_CT_EXPECT_PERMANENT;
1548 exp->helper = nf_conntrack_helper_q931;
1549
6823645d 1550 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1551 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1552 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1553 } else
1554 ret = -1;
1555
6823645d 1556 nf_ct_expect_put(exp);
f587de0e
PM		 1557
1558 return ret;
1559}
1560
1561/****************************************************************************/
3db05fea 1562static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1563 enum ip_conntrack_info ctinfo,
1564 unsigned char **data, LocationRequest *lrq)
1565{
1566 typeof(set_ras_addr_hook) set_ras_addr;
1567
0d53778e 1568 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1569
1570 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1571 if (set_ras_addr && ct->status & IPS_NAT_MASK)
3db05fea 1572 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1573 &lrq->replyAddress, 1);
1574 return 0;
1575}
1576
1577/****************************************************************************/
3db05fea 1578static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1579 enum ip_conntrack_info ctinfo,
1580 unsigned char **data, LocationConfirm *lcf)
1581{
1582 int dir = CTINFO2DIR(ctinfo);
1583 int ret = 0;
1584 __be16 port;
643a2c15 1585 union nf_inet_addr addr;
f587de0e
PM		 1586 struct nf_conntrack_expect *exp;
1587
0d53778e 1588 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1589
1590 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1591 &addr, &port))
1592 return 0;
1593
1594 /* Need new expect for call signal */
6823645d 1595 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1596 return -1;
5e8fbe2a 1597 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1598 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1599 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1600 exp->flags = NF_CT_EXPECT_PERMANENT;
1601 exp->helper = nf_conntrack_helper_q931;
1602
6823645d 1603 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1604 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1605 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1606 } else
1607 ret = -1;
1608
6823645d 1609 nf_ct_expect_put(exp);
f587de0e
PM		 1610
1611 /* Ignore rasAddress */
1612
1613 return ret;
1614}
1615
1616/****************************************************************************/
3db05fea 1617static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1618 enum ip_conntrack_info ctinfo,
1619 unsigned char **data, InfoRequestResponse *irr)
1620{
1621 int ret;
1622 typeof(set_ras_addr_hook) set_ras_addr;
1623 typeof(set_sig_addr_hook) set_sig_addr;
1624
0d53778e 1625 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1626
1627 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1628 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1629 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1630 &irr->rasAddress, 1);
1631 if (ret < 0)
1632 return -1;
1633 }
1634
1635 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1636 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1637 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1638 irr->callSignalAddress.item,
1639 irr->callSignalAddress.count);
1640 if (ret < 0)
1641 return -1;
1642 }
1643
1644 return 0;
1645}
1646
1647/****************************************************************************/
3db05fea 1648static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1649 enum ip_conntrack_info ctinfo,
1650 unsigned char **data, RasMessage *ras)
1651{
1652 switch (ras->choice) {
1653 case eRasMessage_gatekeeperRequest:
3db05fea 1654 return process_grq(skb, ct, ctinfo, data,
f587de0e
PM		 1655 &ras->gatekeeperRequest);
1656 case eRasMessage_gatekeeperConfirm:
3db05fea 1657 return process_gcf(skb, ct, ctinfo, data,
f587de0e
PM		 1658 &ras->gatekeeperConfirm);
1659 case eRasMessage_registrationRequest:
3db05fea 1660 return process_rrq(skb, ct, ctinfo, data,
f587de0e
PM		 1661 &ras->registrationRequest);
1662 case eRasMessage_registrationConfirm:
3db05fea 1663 return process_rcf(skb, ct, ctinfo, data,
f587de0e
PM		 1664 &ras->registrationConfirm);
1665 case eRasMessage_unregistrationRequest:
3db05fea 1666 return process_urq(skb, ct, ctinfo, data,
f587de0e
PM		 1667 &ras->unregistrationRequest);
1668 case eRasMessage_admissionRequest:
3db05fea 1669 return process_arq(skb, ct, ctinfo, data,
f587de0e
PM		 1670 &ras->admissionRequest);
1671 case eRasMessage_admissionConfirm:
3db05fea 1672 return process_acf(skb, ct, ctinfo, data,
f587de0e
PM		 1673 &ras->admissionConfirm);
1674 case eRasMessage_locationRequest:
3db05fea 1675 return process_lrq(skb, ct, ctinfo, data,
f587de0e
PM		 1676 &ras->locationRequest);
1677 case eRasMessage_locationConfirm:
3db05fea 1678 return process_lcf(skb, ct, ctinfo, data,
f587de0e
PM		 1679 &ras->locationConfirm);
1680 case eRasMessage_infoRequestResponse:
3db05fea 1681 return process_irr(skb, ct, ctinfo, data,
f587de0e
PM		 1682 &ras->infoRequestResponse);
1683 default:
0d53778e 1684 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1685 break;
1686 }
1687
1688 return 0;
1689}
1690
1691/****************************************************************************/
3db05fea 1692static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1693 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1694{
1695 static RasMessage ras;
1696 unsigned char *data;
1697 int datalen = 0;
1698 int ret;
1699
3db05fea 1700 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1701
1702 spin_lock_bh(&nf_h323_lock);
1703
1704 /* Get UDP data */
3db05fea 1705 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1706 if (data == NULL)
1707 goto accept;
0d53778e 1708 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
3c9fba65 1709 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1710
1711 /* Decode RAS message */
1712 ret = DecodeRasMessage(data, datalen, &ras);
1713 if (ret < 0) {
0d53778e
PM		 1714 pr_debug("nf_ct_ras: decoding error: %s\n",
1715 ret == H323_ERROR_BOUND ?
1716 "out of bound" : "out of range");
f587de0e
PM		 1717 goto accept;
1718 }
1719
1720 /* Process RAS message */
3db05fea 1721 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
f587de0e
PM		 1722 goto drop;
1723
1724 accept:
1725 spin_unlock_bh(&nf_h323_lock);
1726 return NF_ACCEPT;
1727
1728 drop:
1729 spin_unlock_bh(&nf_h323_lock);
1730 if (net_ratelimit())
1731 printk("nf_ct_ras: packet dropped\n");
1732 return NF_DROP;
1733}
1734
1735/****************************************************************************/
6002f266
PM		 1736static const struct nf_conntrack_expect_policy ras_exp_policy = {
1737 .max_expected = 32,
1738 .timeout = 240,
1739};
1740
f587de0e
PM		 1741static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1742 {
1743 .name = "RAS",
1744 .me = THIS_MODULE,
f587de0e 1745 .tuple.src.l3num = AF_INET,
09640e63 1746 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1747 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1748 .help = ras_help,
6002f266 1749 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1750 },
1751 {
1752 .name = "RAS",
1753 .me = THIS_MODULE,
f587de0e 1754 .tuple.src.l3num = AF_INET6,
09640e63 1755 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1756 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1757 .help = ras_help,
6002f266 1758 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1759 },
1760};
1761
1762/****************************************************************************/
1763static void __exit nf_conntrack_h323_fini(void)
1764{
1765 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1766 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1767 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1768 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81 1769 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1770 kfree(h323_buffer);
0d53778e 1771 pr_debug("nf_ct_h323: fini\n");
f587de0e
PM		 1772}
1773
1774/****************************************************************************/
1775static int __init nf_conntrack_h323_init(void)
1776{
1777 int ret;
1778
1779 h323_buffer = kmalloc(65536, GFP_KERNEL);
1780 if (!h323_buffer)
1781 return -ENOMEM;
a56b8f81 1782 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
f587de0e
PM		 1783 if (ret < 0)
1784 goto err1;
a56b8f81 1785 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
f587de0e
PM		 1786 if (ret < 0)
1787 goto err2;
a56b8f81 1788 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
f587de0e
PM		 1789 if (ret < 0)
1790 goto err3;
a56b8f81 1791 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
f587de0e
PM		 1792 if (ret < 0)
1793 goto err4;
a56b8f81
PM		 1794 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1795 if (ret < 0)
1796 goto err5;
0d53778e 1797 pr_debug("nf_ct_h323: init success\n");
f587de0e
PM		 1798 return 0;
1799
a56b8f81 1800err5:
f587de0e 1801 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
a56b8f81 1802err4:
f587de0e 1803 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
a56b8f81 1804err3:
f587de0e 1805 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81
PM		 1806err2:
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1808err1:
8a548868 1809 kfree(h323_buffer);
f587de0e
PM		 1810 return ret;
1811}
1812
1813/****************************************************************************/
1814module_init(nf_conntrack_h323_init);
1815module_exit(nf_conntrack_h323_fini);
1816
1817EXPORT_SYMBOL_GPL(get_h225_addr);
1818EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1819EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1820EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1821EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1822EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1823EXPORT_SYMBOL_GPL(nat_t120_hook);
1824EXPORT_SYMBOL_GPL(nat_h245_hook);
1825EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1826EXPORT_SYMBOL_GPL(nat_q931_hook);
1827
1828MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1829MODULE_DESCRIPTION("H.323 connection tracking helper");
1830MODULE_LICENSE("GPL");
1831MODULE_ALIAS("ip_conntrack_h323");
4dc06f96 1832MODULE_ALIAS_NFCT_HELPER("h323");
Linux 6.x block layer and io_uring tree(s)