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Merge branch 'clk/mxs-for-3.6' of git://git.linaro.org/people/shawnguo/linux-2.6...
[deliverable/linux.git] / net / netfilter / nf_conntrack_h323_main.c
CommitLineData
f587de0e
PM		 1/*
2 * H.323 connection tracking helper
3 *
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
5 *
6 * This source code is licensed under General Public License version 2.
7 *
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
10 *
11 * For more information, please see http://nath323.sourceforge.net/
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/ctype.h>
17#include <linux/inet.h>
18#include <linux/in.h>
19#include <linux/ip.h>
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
eb939922 45static bool callforward_filter __read_mostly = true;
f587de0e
PM		 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
e772c349 197 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
f587de0e
PM		 198 goto clear_out;
199 }
200
201 /* This is the encapsulated data */
202 *data = tpkt + 4;
203 *datalen = tpktlen - 4;
204 *dataoff = tpktoff + 4;
205
206 out:
207 /* Clear TPKT length */
208 info->tpkt_len[dir] = 0;
209 return 1;
210
211 clear_out:
212 info->tpkt_len[dir] = 0;
213 return 0;
214}
215
216/****************************************************************************/
905e3e8e 217static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
f587de0e 218 H245_TransportAddress *taddr,
643a2c15 219 union nf_inet_addr *addr, __be16 *port)
f587de0e 220{
905e3e8e 221 const unsigned char *p;
f587de0e
PM		 222 int len;
223
224 if (taddr->choice != eH245_TransportAddress_unicastAddress)
225 return 0;
226
227 switch (taddr->unicastAddress.choice) {
228 case eUnicastAddress_iPAddress:
5e8fbe2a 229 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 230 return 0;
231 p = data + taddr->unicastAddress.iPAddress.network;
232 len = 4;
233 break;
234 case eUnicastAddress_iP6Address:
5e8fbe2a 235 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e
PM		 236 return 0;
237 p = data + taddr->unicastAddress.iP6Address.network;
238 len = 16;
239 break;
240 default:
241 return 0;
242 }
243
244 memcpy(addr, p, len);
245 memset((void *)addr + len, 0, sizeof(*addr) - len);
246 memcpy(port, p + len, sizeof(__be16));
247
248 return 1;
249}
250
251/****************************************************************************/
3db05fea 252static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 253 enum ip_conntrack_info ctinfo,
254 unsigned char **data, int dataoff,
255 H245_TransportAddress *taddr)
256{
257 int dir = CTINFO2DIR(ctinfo);
258 int ret = 0;
259 __be16 port;
260 __be16 rtp_port, rtcp_port;
643a2c15 261 union nf_inet_addr addr;
f587de0e
PM		 262 struct nf_conntrack_expect *rtp_exp;
263 struct nf_conntrack_expect *rtcp_exp;
264 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
265
266 /* Read RTP or RTCP address */
267 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
268 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
269 port == 0)
270 return 0;
271
272 /* RTP port is even */
d109e9af
PNA		 273 rtp_port = port & ~htons(1);
274 rtcp_port = port | htons(1);
f587de0e
PM		 275
276 /* Create expect for RTP */
6823645d 277 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 278 return -1;
5e8fbe2a 279 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 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 }
5e8fbe2a 289 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 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 ");
3c9fba65 306 nf_ct_dump_tuple(&rtp_exp->tuple);
0d53778e 307 pr_debug("nf_ct_h323: expect RTCP ");
3c9fba65 308 nf_ct_dump_tuple(&rtcp_exp->tuple);
f587de0e 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;
643a2c15 333 union nf_inet_addr addr;
f587de0e
PM		 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;
5e8fbe2a 346 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 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 ");
3c9fba65 363 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 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. */
fb048833 573 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
f587de0e 574 return NF_ACCEPT;
fb048833 575
3db05fea 576 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
f587de0e
PM		 577
578 spin_lock_bh(&nf_h323_lock);
579
580 /* Process each TPKT */
3db05fea 581 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 582 &data, &datalen, &dataoff)) {
0d53778e 583 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
3c9fba65 584 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 585
586 /* Decode H.245 signal */
587 ret = DecodeMultimediaSystemControlMessage(data, datalen,
588 &mscm);
589 if (ret < 0) {
0d53778e
PM		 590 pr_debug("nf_ct_h245: decoding error: %s\n",
591 ret == H323_ERROR_BOUND ?
592 "out of bound" : "out of range");
f587de0e
PM		 593 /* We don't drop when decoding error */
594 break;
595 }
596
597 /* Process H.245 signal */
3db05fea 598 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
f587de0e
PM		 599 goto drop;
600 }
601
602 spin_unlock_bh(&nf_h323_lock);
603 return NF_ACCEPT;
604
605 drop:
606 spin_unlock_bh(&nf_h323_lock);
e87cc472 607 net_info_ratelimited("nf_ct_h245: packet dropped\n");
f587de0e
PM		 608 return NF_DROP;
609}
610
611/****************************************************************************/
6002f266
PM		 612static const struct nf_conntrack_expect_policy h245_exp_policy = {
613 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
614 .timeout = 240,
615};
616
f587de0e
PM		 617static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
618 .name = "H.245",
619 .me = THIS_MODULE,
a56b8f81 620 .tuple.src.l3num = AF_UNSPEC,
f587de0e 621 .tuple.dst.protonum = IPPROTO_UDP,
6002f266
PM		 622 .help = h245_help,
623 .expect_policy = &h245_exp_policy,
f587de0e
PM		 624};
625
626/****************************************************************************/
627int get_h225_addr(struct nf_conn *ct, unsigned char *data,
628 TransportAddress *taddr,
643a2c15 629 union nf_inet_addr *addr, __be16 *port)
f587de0e 630{
905e3e8e 631 const unsigned char *p;
f587de0e
PM		 632 int len;
633
634 switch (taddr->choice) {
635 case eTransportAddress_ipAddress:
5e8fbe2a 636 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 637 return 0;
638 p = data + taddr->ipAddress.ip;
639 len = 4;
640 break;
641 case eTransportAddress_ip6Address:
5e8fbe2a 642 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e 643 return 0;
bb807245 644 p = data + taddr->ip6Address.ip;
f587de0e
PM		 645 len = 16;
646 break;
647 default:
648 return 0;
649 }
650
651 memcpy(addr, p, len);
652 memset((void *)addr + len, 0, sizeof(*addr) - len);
653 memcpy(port, p + len, sizeof(__be16));
654
655 return 1;
656}
657
658/****************************************************************************/
3db05fea 659static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 660 enum ip_conntrack_info ctinfo,
661 unsigned char **data, int dataoff,
662 TransportAddress *taddr)
663{
664 int dir = CTINFO2DIR(ctinfo);
665 int ret = 0;
666 __be16 port;
643a2c15 667 union nf_inet_addr addr;
f587de0e
PM		 668 struct nf_conntrack_expect *exp;
669 typeof(nat_h245_hook) nat_h245;
670
671 /* Read h245Address */
672 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
673 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
674 port == 0)
675 return 0;
676
677 /* Create expect for h245 connection */
6823645d 678 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 679 return -1;
5e8fbe2a 680 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 681 &ct->tuplehash[!dir].tuple.src.u3,
682 &ct->tuplehash[!dir].tuple.dst.u3,
683 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 684 exp->helper = &nf_conntrack_helper_h245;
685
686 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
687 &ct->tuplehash[!dir].tuple.dst.u3,
688 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
689 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
690 ct->status & IPS_NAT_MASK) {
691 /* NAT needed */
3db05fea 692 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
f587de0e
PM		 693 port, exp);
694 } else { /* Conntrack only */
6823645d 695 if (nf_ct_expect_related(exp) == 0) {
0d53778e 696 pr_debug("nf_ct_q931: expect H.245 ");
3c9fba65 697 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 698 } else
699 ret = -1;
700 }
701
6823645d 702 nf_ct_expect_put(exp);
f587de0e
PM		 703
704 return ret;
705}
706
707/* If the calling party is on the same side of the forward-to party,
708 * we don't need to track the second call */
905e3e8e 709static int callforward_do_filter(const union nf_inet_addr *src,
76108cea
JE		 710 const union nf_inet_addr *dst,
711 u_int8_t family)
f587de0e 712{
1e796fda 713 const struct nf_afinfo *afinfo;
f587de0e
PM		 714 int ret = 0;
715
1841a4c7
PM		 716 /* rcu_read_lock()ed by nf_hook_slow() */
717 afinfo = nf_get_afinfo(family);
718 if (!afinfo)
719 return 0;
720
f587de0e
PM		 721 switch (family) {
722 case AF_INET: {
5a49d0e0 723 struct flowi4 fl1, fl2;
f587de0e
PM		 724 struct rtable *rt1, *rt2;
725
5a49d0e0
DM		 726 memset(&fl1, 0, sizeof(fl1));
727 fl1.daddr = src->ip;
728
729 memset(&fl2, 0, sizeof(fl2));
730 fl2.daddr = dst->ip;
31ad3dd6 731 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
0fae2e77 732 flowi4_to_flowi(&fl1), false)) {
31ad3dd6 733 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
0fae2e77 734 flowi4_to_flowi(&fl2), false)) {
f587de0e 735 if (rt1->rt_gateway == rt2->rt_gateway &&
d8d1f30b 736 rt1->dst.dev == rt2->dst.dev)
f587de0e 737 ret = 1;
d8d1f30b 738 dst_release(&rt2->dst);
f587de0e 739 }
d8d1f30b 740 dst_release(&rt1->dst);
f587de0e
PM		 741 }
742 break;
743 }
c0cd1156 744#if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
f587de0e 745 case AF_INET6: {
5a49d0e0 746 struct flowi6 fl1, fl2;
f587de0e
PM		 747 struct rt6_info *rt1, *rt2;
748
5a49d0e0 749 memset(&fl1, 0, sizeof(fl1));
4e3fd7a0 750 fl1.daddr = src->in6;
5a49d0e0
DM		 751
752 memset(&fl2, 0, sizeof(fl2));
4e3fd7a0 753 fl2.daddr = dst->in6;
31ad3dd6 754 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
0fae2e77 755 flowi6_to_flowi(&fl1), false)) {
31ad3dd6 756 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
0fae2e77 757 flowi6_to_flowi(&fl2), false)) {
f587de0e 758 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
601e68e1 759 sizeof(rt1->rt6i_gateway)) &&
d8d1f30b 760 rt1->dst.dev == rt2->dst.dev)
f587de0e 761 ret = 1;
d8d1f30b 762 dst_release(&rt2->dst);
f587de0e 763 }
d8d1f30b 764 dst_release(&rt1->dst);
f587de0e
PM		 765 }
766 break;
767 }
768#endif
769 }
770 return ret;
771
772}
773
774/****************************************************************************/
3db05fea 775static int expect_callforwarding(struct sk_buff *skb,
f587de0e
PM		 776 struct nf_conn *ct,
777 enum ip_conntrack_info ctinfo,
778 unsigned char **data, int dataoff,
779 TransportAddress *taddr)
780{
781 int dir = CTINFO2DIR(ctinfo);
782 int ret = 0;
783 __be16 port;
643a2c15 784 union nf_inet_addr addr;
f587de0e
PM		 785 struct nf_conntrack_expect *exp;
786 typeof(nat_callforwarding_hook) nat_callforwarding;
787
788 /* Read alternativeAddress */
789 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
790 return 0;
791
792 /* If the calling party is on the same side of the forward-to party,
793 * we don't need to track the second call */
794 if (callforward_filter &&
795 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
5e8fbe2a 796 nf_ct_l3num(ct))) {
0d53778e 797 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
f587de0e
PM		 798 return 0;
799 }
800
801 /* Create expect for the second call leg */
6823645d 802 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 803 return -1;
5e8fbe2a 804 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 805 &ct->tuplehash[!dir].tuple.src.u3, &addr,
806 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 807 exp->helper = nf_conntrack_helper_q931;
808
809 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
810 &ct->tuplehash[!dir].tuple.dst.u3,
811 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
812 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
813 ct->status & IPS_NAT_MASK) {
814 /* Need NAT */
3db05fea 815 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 816 taddr, port, exp);
817 } else { /* Conntrack only */
6823645d 818 if (nf_ct_expect_related(exp) == 0) {
0d53778e 819 pr_debug("nf_ct_q931: expect Call Forwarding ");
3c9fba65 820 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 821 } else
822 ret = -1;
823 }
824
6823645d 825 nf_ct_expect_put(exp);
f587de0e
PM		 826
827 return ret;
828}
829
830/****************************************************************************/
3db05fea 831static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 832 enum ip_conntrack_info ctinfo,
833 unsigned char **data, int dataoff,
834 Setup_UUIE *setup)
835{
836 int dir = CTINFO2DIR(ctinfo);
837 int ret;
838 int i;
839 __be16 port;
643a2c15 840 union nf_inet_addr addr;
f587de0e
PM		 841 typeof(set_h225_addr_hook) set_h225_addr;
842
0d53778e 843 pr_debug("nf_ct_q931: Setup\n");
f587de0e
PM		 844
845 if (setup->options & eSetup_UUIE_h245Address) {
3db05fea 846 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 847 &setup->h245Address);
848 if (ret < 0)
849 return -1;
850 }
851
852 set_h225_addr = rcu_dereference(set_h225_addr_hook);
853 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
6aebb9b2 854 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
f587de0e 855 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
601e68e1 856 &addr, &port) &&
f587de0e 857 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
5b095d98 858 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 859 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
0d53778e 860 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
3db05fea 861 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 862 &setup->destCallSignalAddress,
863 &ct->tuplehash[!dir].tuple.src.u3,
864 ct->tuplehash[!dir].tuple.src.u.tcp.port);
865 if (ret < 0)
866 return -1;
867 }
868
869 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
870 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
871 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
601e68e1 872 &addr, &port) &&
f587de0e 873 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
5b095d98 874 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 875 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
0d53778e 876 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
3db05fea 877 ret = set_h225_addr(skb, data, dataoff,
f587de0e
PM		 878 &setup->sourceCallSignalAddress,
879 &ct->tuplehash[!dir].tuple.dst.u3,
880 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
881 if (ret < 0)
882 return -1;
883 }
884
885 if (setup->options & eSetup_UUIE_fastStart) {
886 for (i = 0; i < setup->fastStart.count; i++) {
3db05fea 887 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 888 &setup->fastStart.item[i]);
889 if (ret < 0)
890 return -1;
891 }
892 }
893
894 return 0;
895}
896
897/****************************************************************************/
3db05fea 898static int process_callproceeding(struct sk_buff *skb,
f587de0e
PM		 899 struct nf_conn *ct,
900 enum ip_conntrack_info ctinfo,
901 unsigned char **data, int dataoff,
902 CallProceeding_UUIE *callproc)
903{
904 int ret;
905 int i;
906
0d53778e 907 pr_debug("nf_ct_q931: CallProceeding\n");
f587de0e
PM		 908
909 if (callproc->options & eCallProceeding_UUIE_h245Address) {
3db05fea 910 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 911 &callproc->h245Address);
912 if (ret < 0)
913 return -1;
914 }
915
916 if (callproc->options & eCallProceeding_UUIE_fastStart) {
917 for (i = 0; i < callproc->fastStart.count; i++) {
3db05fea 918 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 919 &callproc->fastStart.item[i]);
920 if (ret < 0)
921 return -1;
922 }
923 }
924
925 return 0;
926}
927
928/****************************************************************************/
3db05fea 929static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 930 enum ip_conntrack_info ctinfo,
931 unsigned char **data, int dataoff,
932 Connect_UUIE *connect)
933{
934 int ret;
935 int i;
936
0d53778e 937 pr_debug("nf_ct_q931: Connect\n");
f587de0e
PM		 938
939 if (connect->options & eConnect_UUIE_h245Address) {
3db05fea 940 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 941 &connect->h245Address);
942 if (ret < 0)
943 return -1;
944 }
945
946 if (connect->options & eConnect_UUIE_fastStart) {
947 for (i = 0; i < connect->fastStart.count; i++) {
3db05fea 948 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 949 &connect->fastStart.item[i]);
950 if (ret < 0)
951 return -1;
952 }
953 }
954
955 return 0;
956}
957
958/****************************************************************************/
3db05fea 959static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 960 enum ip_conntrack_info ctinfo,
961 unsigned char **data, int dataoff,
962 Alerting_UUIE *alert)
963{
964 int ret;
965 int i;
966
0d53778e 967 pr_debug("nf_ct_q931: Alerting\n");
f587de0e
PM		 968
969 if (alert->options & eAlerting_UUIE_h245Address) {
3db05fea 970 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 971 &alert->h245Address);
972 if (ret < 0)
973 return -1;
974 }
975
976 if (alert->options & eAlerting_UUIE_fastStart) {
977 for (i = 0; i < alert->fastStart.count; i++) {
3db05fea 978 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 979 &alert->fastStart.item[i]);
980 if (ret < 0)
981 return -1;
982 }
983 }
984
985 return 0;
986}
987
f587de0e 988/****************************************************************************/
3db05fea 989static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 990 enum ip_conntrack_info ctinfo,
991 unsigned char **data, int dataoff,
992 Facility_UUIE *facility)
993{
994 int ret;
995 int i;
996
0d53778e 997 pr_debug("nf_ct_q931: Facility\n");
f587de0e
PM		 998
999 if (facility->reason.choice == eFacilityReason_callForwarded) {
1000 if (facility->options & eFacility_UUIE_alternativeAddress)
3db05fea 1001 return expect_callforwarding(skb, ct, ctinfo, data,
f587de0e
PM		 1002 dataoff,
1003 &facility->
1004 alternativeAddress);
1005 return 0;
1006 }
1007
1008 if (facility->options & eFacility_UUIE_h245Address) {
3db05fea 1009 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1010 &facility->h245Address);
1011 if (ret < 0)
1012 return -1;
1013 }
1014
1015 if (facility->options & eFacility_UUIE_fastStart) {
1016 for (i = 0; i < facility->fastStart.count; i++) {
3db05fea 1017 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1018 &facility->fastStart.item[i]);
1019 if (ret < 0)
1020 return -1;
1021 }
1022 }
1023
1024 return 0;
1025}
1026
1027/****************************************************************************/
3db05fea 1028static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1029 enum ip_conntrack_info ctinfo,
1030 unsigned char **data, int dataoff,
1031 Progress_UUIE *progress)
1032{
1033 int ret;
1034 int i;
1035
0d53778e 1036 pr_debug("nf_ct_q931: Progress\n");
f587de0e
PM		 1037
1038 if (progress->options & eProgress_UUIE_h245Address) {
3db05fea 1039 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1040 &progress->h245Address);
1041 if (ret < 0)
1042 return -1;
1043 }
1044
1045 if (progress->options & eProgress_UUIE_fastStart) {
1046 for (i = 0; i < progress->fastStart.count; i++) {
3db05fea 1047 ret = process_olc(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1048 &progress->fastStart.item[i]);
1049 if (ret < 0)
1050 return -1;
1051 }
1052 }
1053
1054 return 0;
1055}
1056
1057/****************************************************************************/
3db05fea 1058static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1059 enum ip_conntrack_info ctinfo,
1060 unsigned char **data, int dataoff, Q931 *q931)
1061{
1062 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1063 int i;
1064 int ret = 0;
1065
1066 switch (pdu->h323_message_body.choice) {
1067 case eH323_UU_PDU_h323_message_body_setup:
3db05fea 1068 ret = process_setup(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1069 &pdu->h323_message_body.setup);
1070 break;
1071 case eH323_UU_PDU_h323_message_body_callProceeding:
3db05fea 1072 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1073 &pdu->h323_message_body.
1074 callProceeding);
1075 break;
1076 case eH323_UU_PDU_h323_message_body_connect:
3db05fea 1077 ret = process_connect(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1078 &pdu->h323_message_body.connect);
1079 break;
1080 case eH323_UU_PDU_h323_message_body_alerting:
3db05fea 1081 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1082 &pdu->h323_message_body.alerting);
1083 break;
f587de0e 1084 case eH323_UU_PDU_h323_message_body_facility:
3db05fea 1085 ret = process_facility(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1086 &pdu->h323_message_body.facility);
1087 break;
1088 case eH323_UU_PDU_h323_message_body_progress:
3db05fea 1089 ret = process_progress(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1090 &pdu->h323_message_body.progress);
1091 break;
1092 default:
0d53778e
PM		 1093 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1094 pdu->h323_message_body.choice);
f587de0e
PM		 1095 break;
1096 }
1097
1098 if (ret < 0)
1099 return -1;
1100
1101 if (pdu->options & eH323_UU_PDU_h245Control) {
1102 for (i = 0; i < pdu->h245Control.count; i++) {
3db05fea 1103 ret = process_h245(skb, ct, ctinfo, data, dataoff,
f587de0e
PM		 1104 &pdu->h245Control.item[i]);
1105 if (ret < 0)
1106 return -1;
1107 }
1108 }
1109
1110 return 0;
1111}
1112
1113/****************************************************************************/
3db05fea 1114static int q931_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1115 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1116{
1117 static Q931 q931;
1118 unsigned char *data = NULL;
1119 int datalen;
1120 int dataoff;
1121 int ret;
1122
1123 /* Until there's been traffic both ways, don't look in packets. */
fb048833 1124 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
f587de0e 1125 return NF_ACCEPT;
fb048833 1126
3db05fea 1127 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
f587de0e
PM		 1128
1129 spin_lock_bh(&nf_h323_lock);
1130
1131 /* Process each TPKT */
3db05fea 1132 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 1133 &data, &datalen, &dataoff)) {
0d53778e 1134 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
3c9fba65 1135 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1136
1137 /* Decode Q.931 signal */
1138 ret = DecodeQ931(data, datalen, &q931);
1139 if (ret < 0) {
0d53778e
PM		 1140 pr_debug("nf_ct_q931: decoding error: %s\n",
1141 ret == H323_ERROR_BOUND ?
1142 "out of bound" : "out of range");
f587de0e
PM		 1143 /* We don't drop when decoding error */
1144 break;
1145 }
1146
1147 /* Process Q.931 signal */
3db05fea 1148 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
f587de0e
PM		 1149 goto drop;
1150 }
1151
1152 spin_unlock_bh(&nf_h323_lock);
1153 return NF_ACCEPT;
1154
1155 drop:
1156 spin_unlock_bh(&nf_h323_lock);
e87cc472 1157 net_info_ratelimited("nf_ct_q931: packet dropped\n");
f587de0e
PM		 1158 return NF_DROP;
1159}
1160
1161/****************************************************************************/
6002f266
PM		 1162static const struct nf_conntrack_expect_policy q931_exp_policy = {
1163 /* T.120 and H.245 */
1164 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1165 .timeout = 240,
1166};
1167
f587de0e
PM		 1168static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1169 {
1170 .name = "Q.931",
1171 .me = THIS_MODULE,
f587de0e 1172 .tuple.src.l3num = AF_INET,
09640e63 1173 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1174 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1175 .help = q931_help,
1176 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1177 },
1178 {
1179 .name = "Q.931",
1180 .me = THIS_MODULE,
f587de0e 1181 .tuple.src.l3num = AF_INET6,
09640e63 1182 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1183 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1184 .help = q931_help,
1185 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1186 },
1187};
1188
1189/****************************************************************************/
3db05fea 1190static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1191 int *datalen)
1192{
905e3e8e
JE		 1193 const struct udphdr *uh;
1194 struct udphdr _uh;
f587de0e
PM		 1195 int dataoff;
1196
3db05fea 1197 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1198 if (uh == NULL)
1199 return NULL;
1200 dataoff = protoff + sizeof(_uh);
3db05fea 1201 if (dataoff >= skb->len)
f587de0e 1202 return NULL;
3db05fea
HX		 1203 *datalen = skb->len - dataoff;
1204 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1205}
1206
1207/****************************************************************************/
1208static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
643a2c15 1209 union nf_inet_addr *addr,
f587de0e
PM		 1210 __be16 port)
1211{
84541cc1 1212 struct net *net = nf_ct_net(ct);
f587de0e
PM		 1213 struct nf_conntrack_expect *exp;
1214 struct nf_conntrack_tuple tuple;
1215
1216 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1217 tuple.src.u.tcp.port = 0;
1218 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1219 tuple.dst.u.tcp.port = port;
1220 tuple.dst.protonum = IPPROTO_TCP;
1221
5d0aa2cc 1222 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
f587de0e
PM		 1223 if (exp && exp->master == ct)
1224 return exp;
1225 return NULL;
1226}
1227
1228/****************************************************************************/
1229static int set_expect_timeout(struct nf_conntrack_expect *exp,
95c96174 1230 unsigned int timeout)
f587de0e
PM		 1231{
1232 if (!exp || !del_timer(&exp->timeout))
1233 return 0;
1234
1235 exp->timeout.expires = jiffies + timeout * HZ;
1236 add_timer(&exp->timeout);
1237
1238 return 1;
1239}
1240
1241/****************************************************************************/
3db05fea 1242static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1243 enum ip_conntrack_info ctinfo,
1244 unsigned char **data,
1245 TransportAddress *taddr, int count)
1246{
1247 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1248 int dir = CTINFO2DIR(ctinfo);
1249 int ret = 0;
1250 int i;
1251 __be16 port;
643a2c15 1252 union nf_inet_addr addr;
f587de0e
PM		 1253 struct nf_conntrack_expect *exp;
1254 typeof(nat_q931_hook) nat_q931;
1255
1256 /* Look for the first related address */
1257 for (i = 0; i < count; i++) {
1258 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1259 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1260 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1261 break;
1262 }
1263
1264 if (i >= count) /* Not found */
1265 return 0;
1266
1267 /* Create expect for Q.931 */
6823645d 1268 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1269 return -1;
5e8fbe2a 1270 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1271 gkrouted_only ? /* only accept calls from GK? */
1272 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1273 &ct->tuplehash[!dir].tuple.dst.u3,
1274 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1275 exp->helper = nf_conntrack_helper_q931;
1276 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1277
1278 nat_q931 = rcu_dereference(nat_q931_hook);
1279 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
3db05fea 1280 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
f587de0e 1281 } else { /* Conntrack only */
6823645d 1282 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1283 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1284 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1285
1286 /* Save port for looking up expect in processing RCF */
1287 info->sig_port[dir] = port;
1288 } else
1289 ret = -1;
1290 }
1291
6823645d 1292 nf_ct_expect_put(exp);
f587de0e
PM		 1293
1294 return ret;
1295}
1296
1297/****************************************************************************/
3db05fea 1298static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1299 enum ip_conntrack_info ctinfo,
1300 unsigned char **data, GatekeeperRequest *grq)
1301{
1302 typeof(set_ras_addr_hook) set_ras_addr;
1303
0d53778e 1304 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1305
1306 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1307 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
3db05fea 1308 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1309 &grq->rasAddress, 1);
1310 return 0;
1311}
1312
1313/****************************************************************************/
3db05fea 1314static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1315 enum ip_conntrack_info ctinfo,
1316 unsigned char **data, GatekeeperConfirm *gcf)
1317{
1318 int dir = CTINFO2DIR(ctinfo);
1319 int ret = 0;
1320 __be16 port;
643a2c15 1321 union nf_inet_addr addr;
f587de0e
PM		 1322 struct nf_conntrack_expect *exp;
1323
0d53778e 1324 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1325
1326 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1327 return 0;
1328
1329 /* Registration port is the same as discovery port */
1330 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1331 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1332 return 0;
1333
1334 /* Avoid RAS expectation loops. A GCF is never expected. */
1335 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1336 return 0;
1337
1338 /* Need new expect */
6823645d 1339 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1340 return -1;
5e8fbe2a 1341 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1342 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1343 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1344 exp->helper = nf_conntrack_helper_ras;
1345
6823645d 1346 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1347 pr_debug("nf_ct_ras: expect RAS ");
3c9fba65 1348 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1349 } else
1350 ret = -1;
1351
6823645d 1352 nf_ct_expect_put(exp);
f587de0e
PM		 1353
1354 return ret;
1355}
1356
1357/****************************************************************************/
3db05fea 1358static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1359 enum ip_conntrack_info ctinfo,
1360 unsigned char **data, RegistrationRequest *rrq)
1361{
1362 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1363 int ret;
1364 typeof(set_ras_addr_hook) set_ras_addr;
1365
0d53778e 1366 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1367
3db05fea 1368 ret = expect_q931(skb, ct, ctinfo, data,
f587de0e
PM		 1369 rrq->callSignalAddress.item,
1370 rrq->callSignalAddress.count);
1371 if (ret < 0)
1372 return -1;
1373
1374 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1375 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1376 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1377 rrq->rasAddress.item,
1378 rrq->rasAddress.count);
1379 if (ret < 0)
1380 return -1;
1381 }
1382
1383 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1384 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1385 info->timeout = rrq->timeToLive;
1386 } else
1387 info->timeout = default_rrq_ttl;
1388
1389 return 0;
1390}
1391
1392/****************************************************************************/
3db05fea 1393static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1394 enum ip_conntrack_info ctinfo,
1395 unsigned char **data, RegistrationConfirm *rcf)
1396{
1397 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1398 int dir = CTINFO2DIR(ctinfo);
1399 int ret;
1400 struct nf_conntrack_expect *exp;
1401 typeof(set_sig_addr_hook) set_sig_addr;
1402
0d53778e 1403 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1404
1405 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1406 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1407 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1408 rcf->callSignalAddress.item,
1409 rcf->callSignalAddress.count);
1410 if (ret < 0)
1411 return -1;
1412 }
1413
1414 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1415 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1416 info->timeout = rcf->timeToLive;
1417 }
1418
1419 if (info->timeout > 0) {
0d53778e
PM		 1420 pr_debug("nf_ct_ras: set RAS connection timeout to "
1421 "%u seconds\n", info->timeout);
3db05fea 1422 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1423
1424 /* Set expect timeout */
f8ba1aff 1425 spin_lock_bh(&nf_conntrack_lock);
f587de0e
PM		 1426 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1427 info->sig_port[!dir]);
1428 if (exp) {
0d53778e
PM		 1429 pr_debug("nf_ct_ras: set Q.931 expect "
1430 "timeout to %u seconds for",
1431 info->timeout);
3c9fba65 1432 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1433 set_expect_timeout(exp, info->timeout);
1434 }
f8ba1aff 1435 spin_unlock_bh(&nf_conntrack_lock);
f587de0e
PM		 1436 }
1437
1438 return 0;
1439}
1440
1441/****************************************************************************/
3db05fea 1442static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1443 enum ip_conntrack_info ctinfo,
1444 unsigned char **data, UnregistrationRequest *urq)
1445{
1446 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1447 int dir = CTINFO2DIR(ctinfo);
1448 int ret;
1449 typeof(set_sig_addr_hook) set_sig_addr;
1450
0d53778e 1451 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1452
1453 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1454 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1455 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1456 urq->callSignalAddress.item,
1457 urq->callSignalAddress.count);
1458 if (ret < 0)
1459 return -1;
1460 }
1461
1462 /* Clear old expect */
1463 nf_ct_remove_expectations(ct);
1464 info->sig_port[dir] = 0;
1465 info->sig_port[!dir] = 0;
1466
1467 /* Give it 30 seconds for UCF or URJ */
3db05fea 1468 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1469
1470 return 0;
1471}
1472
1473/****************************************************************************/
3db05fea 1474static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1475 enum ip_conntrack_info ctinfo,
1476 unsigned char **data, AdmissionRequest *arq)
1477{
905e3e8e 1478 const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
f587de0e
PM		 1479 int dir = CTINFO2DIR(ctinfo);
1480 __be16 port;
643a2c15 1481 union nf_inet_addr addr;
f587de0e
PM		 1482 typeof(set_h225_addr_hook) set_h225_addr;
1483
0d53778e 1484 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1485
1486 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1487 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1488 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1489 &addr, &port) &&
f587de0e
PM		 1490 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1491 port == info->sig_port[dir] &&
1492 set_h225_addr && ct->status & IPS_NAT_MASK) {
1493 /* Answering ARQ */
3db05fea 1494 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1495 &arq->destCallSignalAddress,
1496 &ct->tuplehash[!dir].tuple.dst.u3,
1497 info->sig_port[!dir]);
1498 }
1499
1500 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1501 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1502 &addr, &port) &&
f587de0e
PM		 1503 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1504 set_h225_addr && ct->status & IPS_NAT_MASK) {
1505 /* Calling ARQ */
3db05fea 1506 return set_h225_addr(skb, data, 0,
f587de0e
PM		 1507 &arq->srcCallSignalAddress,
1508 &ct->tuplehash[!dir].tuple.dst.u3,
1509 port);
1510 }
1511
1512 return 0;
1513}
1514
1515/****************************************************************************/
3db05fea 1516static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1517 enum ip_conntrack_info ctinfo,
1518 unsigned char **data, AdmissionConfirm *acf)
1519{
1520 int dir = CTINFO2DIR(ctinfo);
1521 int ret = 0;
1522 __be16 port;
643a2c15 1523 union nf_inet_addr addr;
f587de0e
PM		 1524 struct nf_conntrack_expect *exp;
1525 typeof(set_sig_addr_hook) set_sig_addr;
1526
0d53778e 1527 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1528
1529 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1530 &addr, &port))
1531 return 0;
1532
1533 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1534 /* Answering ACF */
1535 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1536 if (set_sig_addr && ct->status & IPS_NAT_MASK)
3db05fea 1537 return set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1538 &acf->destCallSignalAddress, 1);
1539 return 0;
1540 }
1541
1542 /* Need new expect */
6823645d 1543 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1544 return -1;
5e8fbe2a 1545 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1546 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1547 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1548 exp->flags = NF_CT_EXPECT_PERMANENT;
1549 exp->helper = nf_conntrack_helper_q931;
1550
6823645d 1551 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1552 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1553 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1554 } else
1555 ret = -1;
1556
6823645d 1557 nf_ct_expect_put(exp);
f587de0e
PM		 1558
1559 return ret;
1560}
1561
1562/****************************************************************************/
3db05fea 1563static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1564 enum ip_conntrack_info ctinfo,
1565 unsigned char **data, LocationRequest *lrq)
1566{
1567 typeof(set_ras_addr_hook) set_ras_addr;
1568
0d53778e 1569 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1570
1571 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1572 if (set_ras_addr && ct->status & IPS_NAT_MASK)
3db05fea 1573 return set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1574 &lrq->replyAddress, 1);
1575 return 0;
1576}
1577
1578/****************************************************************************/
3db05fea 1579static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1580 enum ip_conntrack_info ctinfo,
1581 unsigned char **data, LocationConfirm *lcf)
1582{
1583 int dir = CTINFO2DIR(ctinfo);
1584 int ret = 0;
1585 __be16 port;
643a2c15 1586 union nf_inet_addr addr;
f587de0e
PM		 1587 struct nf_conntrack_expect *exp;
1588
0d53778e 1589 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1590
1591 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1592 &addr, &port))
1593 return 0;
1594
1595 /* Need new expect for call signal */
6823645d 1596 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1597 return -1;
5e8fbe2a 1598 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1599 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1600 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1601 exp->flags = NF_CT_EXPECT_PERMANENT;
1602 exp->helper = nf_conntrack_helper_q931;
1603
6823645d 1604 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1605 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1606 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1607 } else
1608 ret = -1;
1609
6823645d 1610 nf_ct_expect_put(exp);
f587de0e
PM		 1611
1612 /* Ignore rasAddress */
1613
1614 return ret;
1615}
1616
1617/****************************************************************************/
3db05fea 1618static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1619 enum ip_conntrack_info ctinfo,
1620 unsigned char **data, InfoRequestResponse *irr)
1621{
1622 int ret;
1623 typeof(set_ras_addr_hook) set_ras_addr;
1624 typeof(set_sig_addr_hook) set_sig_addr;
1625
0d53778e 1626 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1627
1628 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1629 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1630 ret = set_ras_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1631 &irr->rasAddress, 1);
1632 if (ret < 0)
1633 return -1;
1634 }
1635
1636 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1637 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
3db05fea 1638 ret = set_sig_addr(skb, ct, ctinfo, data,
f587de0e
PM		 1639 irr->callSignalAddress.item,
1640 irr->callSignalAddress.count);
1641 if (ret < 0)
1642 return -1;
1643 }
1644
1645 return 0;
1646}
1647
1648/****************************************************************************/
3db05fea 1649static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e
PM		 1650 enum ip_conntrack_info ctinfo,
1651 unsigned char **data, RasMessage *ras)
1652{
1653 switch (ras->choice) {
1654 case eRasMessage_gatekeeperRequest:
3db05fea 1655 return process_grq(skb, ct, ctinfo, data,
f587de0e
PM		 1656 &ras->gatekeeperRequest);
1657 case eRasMessage_gatekeeperConfirm:
3db05fea 1658 return process_gcf(skb, ct, ctinfo, data,
f587de0e
PM		 1659 &ras->gatekeeperConfirm);
1660 case eRasMessage_registrationRequest:
3db05fea 1661 return process_rrq(skb, ct, ctinfo, data,
f587de0e
PM		 1662 &ras->registrationRequest);
1663 case eRasMessage_registrationConfirm:
3db05fea 1664 return process_rcf(skb, ct, ctinfo, data,
f587de0e
PM		 1665 &ras->registrationConfirm);
1666 case eRasMessage_unregistrationRequest:
3db05fea 1667 return process_urq(skb, ct, ctinfo, data,
f587de0e
PM		 1668 &ras->unregistrationRequest);
1669 case eRasMessage_admissionRequest:
3db05fea 1670 return process_arq(skb, ct, ctinfo, data,
f587de0e
PM		 1671 &ras->admissionRequest);
1672 case eRasMessage_admissionConfirm:
3db05fea 1673 return process_acf(skb, ct, ctinfo, data,
f587de0e
PM		 1674 &ras->admissionConfirm);
1675 case eRasMessage_locationRequest:
3db05fea 1676 return process_lrq(skb, ct, ctinfo, data,
f587de0e
PM		 1677 &ras->locationRequest);
1678 case eRasMessage_locationConfirm:
3db05fea 1679 return process_lcf(skb, ct, ctinfo, data,
f587de0e
PM		 1680 &ras->locationConfirm);
1681 case eRasMessage_infoRequestResponse:
3db05fea 1682 return process_irr(skb, ct, ctinfo, data,
f587de0e
PM		 1683 &ras->infoRequestResponse);
1684 default:
0d53778e 1685 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1686 break;
1687 }
1688
1689 return 0;
1690}
1691
1692/****************************************************************************/
3db05fea 1693static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1694 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1695{
1696 static RasMessage ras;
1697 unsigned char *data;
1698 int datalen = 0;
1699 int ret;
1700
3db05fea 1701 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1702
1703 spin_lock_bh(&nf_h323_lock);
1704
1705 /* Get UDP data */
3db05fea 1706 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1707 if (data == NULL)
1708 goto accept;
0d53778e 1709 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
3c9fba65 1710 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1711
1712 /* Decode RAS message */
1713 ret = DecodeRasMessage(data, datalen, &ras);
1714 if (ret < 0) {
0d53778e
PM		 1715 pr_debug("nf_ct_ras: decoding error: %s\n",
1716 ret == H323_ERROR_BOUND ?
1717 "out of bound" : "out of range");
f587de0e
PM		 1718 goto accept;
1719 }
1720
1721 /* Process RAS message */
3db05fea 1722 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
f587de0e
PM		 1723 goto drop;
1724
1725 accept:
1726 spin_unlock_bh(&nf_h323_lock);
1727 return NF_ACCEPT;
1728
1729 drop:
1730 spin_unlock_bh(&nf_h323_lock);
e87cc472 1731 net_info_ratelimited("nf_ct_ras: packet dropped\n");
f587de0e
PM		 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");
be3eed2e
PNA		 1832MODULE_ALIAS_NFCT_HELPER("RAS");
1833MODULE_ALIAS_NFCT_HELPER("Q.931");
1834MODULE_ALIAS_NFCT_HELPER("H.245");
Linux kernel - Deliverables
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