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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[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>
f229f6ce 5 * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
f587de0e
PM		 6 *
7 * This source code is licensed under General Public License version 2.
8 *
9 * Based on the 'brute force' H.323 connection tracking module by
10 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 *
12 * For more information, please see http://nath323.sourceforge.net/
13 */
14
15#include <linux/module.h>
16#include <linux/moduleparam.h>
17#include <linux/ctype.h>
18#include <linux/inet.h>
19#include <linux/in.h>
20#include <linux/ip.h>
5a0e3ad6 21#include <linux/slab.h>
f587de0e
PM		 22#include <linux/udp.h>
23#include <linux/tcp.h>
24#include <linux/skbuff.h>
25#include <net/route.h>
26#include <net/ip6_route.h>
27
28#include <net/netfilter/nf_conntrack.h>
29#include <net/netfilter/nf_conntrack_core.h>
30#include <net/netfilter/nf_conntrack_tuple.h>
31#include <net/netfilter/nf_conntrack_expect.h>
32#include <net/netfilter/nf_conntrack_ecache.h>
33#include <net/netfilter/nf_conntrack_helper.h>
5d0aa2cc 34#include <net/netfilter/nf_conntrack_zones.h>
f587de0e
PM		 35#include <linux/netfilter/nf_conntrack_h323.h>
36
f587de0e
PM		 37/* Parameters */
38static unsigned int default_rrq_ttl __read_mostly = 300;
39module_param(default_rrq_ttl, uint, 0600);
40MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
41
42static int gkrouted_only __read_mostly = 1;
43module_param(gkrouted_only, int, 0600);
44MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
45
eb939922 46static bool callforward_filter __read_mostly = true;
f587de0e
PM		 47module_param(callforward_filter, bool, 0600);
48MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
601e68e1 49 "if both endpoints are on different sides "
f587de0e
PM		 50 "(determined by routing information)");
51
52/* Hooks for NAT */
051966c0 53int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 54 unsigned char **data, int dataoff,
55 H245_TransportAddress *taddr,
643a2c15 56 union nf_inet_addr *addr, __be16 port)
f587de0e 57 __read_mostly;
051966c0 58int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 59 unsigned char **data, int dataoff,
60 TransportAddress *taddr,
643a2c15 61 union nf_inet_addr *addr, __be16 port)
f587de0e 62 __read_mostly;
3db05fea 63int (*set_sig_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 64 struct nf_conn *ct,
65 enum ip_conntrack_info ctinfo,
051966c0 66 unsigned int protoff, unsigned char **data,
f587de0e 67 TransportAddress *taddr, int count) __read_mostly;
3db05fea 68int (*set_ras_addr_hook) (struct sk_buff *skb,
f587de0e
PM		 69 struct nf_conn *ct,
70 enum ip_conntrack_info ctinfo,
051966c0 71 unsigned int protoff, unsigned char **data,
f587de0e 72 TransportAddress *taddr, int count) __read_mostly;
3db05fea 73int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
f587de0e
PM		 74 struct nf_conn *ct,
75 enum ip_conntrack_info ctinfo,
051966c0 76 unsigned int protoff,
f587de0e
PM		 77 unsigned char **data, int dataoff,
78 H245_TransportAddress *taddr,
79 __be16 port, __be16 rtp_port,
80 struct nf_conntrack_expect *rtp_exp,
81 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
3db05fea 82int (*nat_t120_hook) (struct sk_buff *skb,
f587de0e
PM		 83 struct nf_conn *ct,
84 enum ip_conntrack_info ctinfo,
051966c0 85 unsigned int protoff,
f587de0e
PM		 86 unsigned char **data, int dataoff,
87 H245_TransportAddress *taddr, __be16 port,
88 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 89int (*nat_h245_hook) (struct sk_buff *skb,
f587de0e
PM		 90 struct nf_conn *ct,
91 enum ip_conntrack_info ctinfo,
051966c0 92 unsigned int protoff,
f587de0e
PM		 93 unsigned char **data, int dataoff,
94 TransportAddress *taddr, __be16 port,
95 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 96int (*nat_callforwarding_hook) (struct sk_buff *skb,
f587de0e
PM		 97 struct nf_conn *ct,
98 enum ip_conntrack_info ctinfo,
051966c0 99 unsigned int protoff,
f587de0e
PM		 100 unsigned char **data, int dataoff,
101 TransportAddress *taddr, __be16 port,
102 struct nf_conntrack_expect *exp) __read_mostly;
3db05fea 103int (*nat_q931_hook) (struct sk_buff *skb,
f587de0e
PM		 104 struct nf_conn *ct,
105 enum ip_conntrack_info ctinfo,
051966c0 106 unsigned int protoff,
f587de0e
PM		 107 unsigned char **data, TransportAddress *taddr, int idx,
108 __be16 port, struct nf_conntrack_expect *exp)
109 __read_mostly;
110
111static DEFINE_SPINLOCK(nf_h323_lock);
112static char *h323_buffer;
113
114static struct nf_conntrack_helper nf_conntrack_helper_h245;
115static struct nf_conntrack_helper nf_conntrack_helper_q931[];
116static struct nf_conntrack_helper nf_conntrack_helper_ras[];
117
118/****************************************************************************/
3db05fea 119static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 120 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
121 unsigned char **data, int *datalen, int *dataoff)
122{
1afc5679 123 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e 124 int dir = CTINFO2DIR(ctinfo);
905e3e8e
JE		 125 const struct tcphdr *th;
126 struct tcphdr _tcph;
f587de0e
PM		 127 int tcpdatalen;
128 int tcpdataoff;
129 unsigned char *tpkt;
130 int tpktlen;
131 int tpktoff;
132
133 /* Get TCP header */
3db05fea 134 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
f587de0e
PM		 135 if (th == NULL)
136 return 0;
137
138 /* Get TCP data offset */
139 tcpdataoff = protoff + th->doff * 4;
140
141 /* Get TCP data length */
3db05fea 142 tcpdatalen = skb->len - tcpdataoff;
f587de0e
PM		 143 if (tcpdatalen <= 0) /* No TCP data */
144 goto clear_out;
145
146 if (*data == NULL) { /* first TPKT */
147 /* Get first TPKT pointer */
3db05fea 148 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
f587de0e
PM		 149 h323_buffer);
150 BUG_ON(tpkt == NULL);
151
152 /* Validate TPKT identifier */
153 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
154 /* Netmeeting sends TPKT header and data separately */
155 if (info->tpkt_len[dir] > 0) {
0d53778e
PM		 156 pr_debug("nf_ct_h323: previous packet "
157 "indicated separate TPKT data of %hu "
158 "bytes\n", info->tpkt_len[dir]);
f587de0e
PM		 159 if (info->tpkt_len[dir] <= tcpdatalen) {
160 /* Yes, there was a TPKT header
161 * received */
162 *data = tpkt;
163 *datalen = info->tpkt_len[dir];
164 *dataoff = 0;
165 goto out;
166 }
167
168 /* Fragmented TPKT */
0d53778e 169 pr_debug("nf_ct_h323: fragmented TPKT\n");
f587de0e
PM		 170 goto clear_out;
171 }
172
173 /* It is not even a TPKT */
174 return 0;
175 }
176 tpktoff = 0;
177 } else { /* Next TPKT */
178 tpktoff = *dataoff + *datalen;
179 tcpdatalen -= tpktoff;
180 if (tcpdatalen <= 4) /* No more TPKT */
181 goto clear_out;
182 tpkt = *data + *datalen;
183
184 /* Validate TPKT identifier */
185 if (tpkt[0] != 0x03 || tpkt[1] != 0)
186 goto clear_out;
187 }
188
189 /* Validate TPKT length */
190 tpktlen = tpkt[2] * 256 + tpkt[3];
191 if (tpktlen < 4)
192 goto clear_out;
193 if (tpktlen > tcpdatalen) {
194 if (tcpdatalen == 4) { /* Separate TPKT header */
195 /* Netmeeting sends TPKT header and data separately */
0d53778e
PM		 196 pr_debug("nf_ct_h323: separate TPKT header indicates "
197 "there will be TPKT data of %hu bytes\n",
198 tpktlen - 4);
f587de0e
PM		 199 info->tpkt_len[dir] = tpktlen - 4;
200 return 0;
201 }
202
e772c349 203 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
f587de0e
PM		 204 goto clear_out;
205 }
206
207 /* This is the encapsulated data */
208 *data = tpkt + 4;
209 *datalen = tpktlen - 4;
210 *dataoff = tpktoff + 4;
211
212 out:
213 /* Clear TPKT length */
214 info->tpkt_len[dir] = 0;
215 return 1;
216
217 clear_out:
218 info->tpkt_len[dir] = 0;
219 return 0;
220}
221
222/****************************************************************************/
905e3e8e 223static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
f587de0e 224 H245_TransportAddress *taddr,
643a2c15 225 union nf_inet_addr *addr, __be16 *port)
f587de0e 226{
905e3e8e 227 const unsigned char *p;
f587de0e
PM		 228 int len;
229
230 if (taddr->choice != eH245_TransportAddress_unicastAddress)
231 return 0;
232
233 switch (taddr->unicastAddress.choice) {
234 case eUnicastAddress_iPAddress:
5e8fbe2a 235 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 236 return 0;
237 p = data + taddr->unicastAddress.iPAddress.network;
238 len = 4;
239 break;
240 case eUnicastAddress_iP6Address:
5e8fbe2a 241 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e
PM		 242 return 0;
243 p = data + taddr->unicastAddress.iP6Address.network;
244 len = 16;
245 break;
246 default:
247 return 0;
248 }
249
250 memcpy(addr, p, len);
251 memset((void *)addr + len, 0, sizeof(*addr) - len);
252 memcpy(port, p + len, sizeof(__be16));
253
254 return 1;
255}
256
257/****************************************************************************/
3db05fea 258static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 259 enum ip_conntrack_info ctinfo,
051966c0 260 unsigned int protoff,
f587de0e
PM		 261 unsigned char **data, int dataoff,
262 H245_TransportAddress *taddr)
263{
264 int dir = CTINFO2DIR(ctinfo);
265 int ret = 0;
266 __be16 port;
267 __be16 rtp_port, rtcp_port;
643a2c15 268 union nf_inet_addr addr;
f587de0e
PM		 269 struct nf_conntrack_expect *rtp_exp;
270 struct nf_conntrack_expect *rtcp_exp;
271 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
272
273 /* Read RTP or RTCP address */
274 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
275 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
276 port == 0)
277 return 0;
278
279 /* RTP port is even */
d109e9af
PNA		 280 rtp_port = port & ~htons(1);
281 rtcp_port = port | htons(1);
f587de0e
PM		 282
283 /* Create expect for RTP */
6823645d 284 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 285 return -1;
5e8fbe2a 286 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 287 &ct->tuplehash[!dir].tuple.src.u3,
288 &ct->tuplehash[!dir].tuple.dst.u3,
289 IPPROTO_UDP, NULL, &rtp_port);
f587de0e
PM		 290
291 /* Create expect for RTCP */
6823645d
PM		 292 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
293 nf_ct_expect_put(rtp_exp);
f587de0e
PM		 294 return -1;
295 }
5e8fbe2a 296 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 297 &ct->tuplehash[!dir].tuple.src.u3,
298 &ct->tuplehash[!dir].tuple.dst.u3,
299 IPPROTO_UDP, NULL, &rtcp_port);
f587de0e
PM		 300
301 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
601e68e1 302 &ct->tuplehash[!dir].tuple.dst.u3,
f587de0e
PM		 303 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
304 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
811927cc 305 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 306 ct->status & IPS_NAT_MASK) {
307 /* NAT needed */
051966c0 308 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 309 taddr, port, rtp_port, rtp_exp, rtcp_exp);
310 } else { /* Conntrack only */
6823645d
PM		 311 if (nf_ct_expect_related(rtp_exp) == 0) {
312 if (nf_ct_expect_related(rtcp_exp) == 0) {
0d53778e 313 pr_debug("nf_ct_h323: expect RTP ");
3c9fba65 314 nf_ct_dump_tuple(&rtp_exp->tuple);
0d53778e 315 pr_debug("nf_ct_h323: expect RTCP ");
3c9fba65 316 nf_ct_dump_tuple(&rtcp_exp->tuple);
f587de0e 317 } else {
6823645d 318 nf_ct_unexpect_related(rtp_exp);
f587de0e
PM		 319 ret = -1;
320 }
321 } else
322 ret = -1;
323 }
324
6823645d
PM		 325 nf_ct_expect_put(rtp_exp);
326 nf_ct_expect_put(rtcp_exp);
f587de0e
PM		 327
328 return ret;
329}
330
331/****************************************************************************/
3db05fea 332static int expect_t120(struct sk_buff *skb,
f587de0e
PM		 333 struct nf_conn *ct,
334 enum ip_conntrack_info ctinfo,
051966c0 335 unsigned int protoff,
f587de0e
PM		 336 unsigned char **data, int dataoff,
337 H245_TransportAddress *taddr)
338{
339 int dir = CTINFO2DIR(ctinfo);
340 int ret = 0;
341 __be16 port;
643a2c15 342 union nf_inet_addr addr;
f587de0e
PM		 343 struct nf_conntrack_expect *exp;
344 typeof(nat_t120_hook) nat_t120;
345
346 /* Read T.120 address */
347 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
348 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
349 port == 0)
350 return 0;
351
352 /* Create expect for T.120 connections */
6823645d 353 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 354 return -1;
5e8fbe2a 355 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 356 &ct->tuplehash[!dir].tuple.src.u3,
357 &ct->tuplehash[!dir].tuple.dst.u3,
358 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 359 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
360
361 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
362 &ct->tuplehash[!dir].tuple.dst.u3,
363 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
364 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
811927cc 365 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 366 ct->status & IPS_NAT_MASK) {
367 /* NAT needed */
051966c0 368 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
f587de0e
PM		 369 port, exp);
370 } else { /* Conntrack only */
6823645d 371 if (nf_ct_expect_related(exp) == 0) {
0d53778e 372 pr_debug("nf_ct_h323: expect T.120 ");
3c9fba65 373 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 374 } else
375 ret = -1;
376 }
377
6823645d 378 nf_ct_expect_put(exp);
f587de0e
PM		 379
380 return ret;
381}
382
383/****************************************************************************/
3db05fea 384static int process_h245_channel(struct sk_buff *skb,
f587de0e
PM		 385 struct nf_conn *ct,
386 enum ip_conntrack_info ctinfo,
051966c0 387 unsigned int protoff,
f587de0e
PM		 388 unsigned char **data, int dataoff,
389 H2250LogicalChannelParameters *channel)
390{
391 int ret;
392
393 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
394 /* RTP */
051966c0 395 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 396 &channel->mediaChannel);
397 if (ret < 0)
398 return -1;
399 }
400
401 if (channel->
402 options & eH2250LogicalChannelParameters_mediaControlChannel) {
403 /* RTCP */
051966c0 404 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 405 &channel->mediaControlChannel);
406 if (ret < 0)
407 return -1;
408 }
409
410 return 0;
411}
412
413/****************************************************************************/
3db05fea 414static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 415 enum ip_conntrack_info ctinfo,
051966c0 416 unsigned int protoff,
f587de0e
PM		 417 unsigned char **data, int dataoff,
418 OpenLogicalChannel *olc)
419{
420 int ret;
421
0d53778e 422 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
f587de0e
PM		 423
424 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
425 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
426 {
051966c0
PM		 427 ret = process_h245_channel(skb, ct, ctinfo,
428 protoff, data, dataoff,
f587de0e
PM		 429 &olc->
430 forwardLogicalChannelParameters.
431 multiplexParameters.
432 h2250LogicalChannelParameters);
433 if (ret < 0)
434 return -1;
435 }
436
437 if ((olc->options &
438 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
439 (olc->reverseLogicalChannelParameters.options &
440 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
441 && (olc->reverseLogicalChannelParameters.multiplexParameters.
442 choice ==
443 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
444 {
445 ret =
051966c0
PM		 446 process_h245_channel(skb, ct, ctinfo,
447 protoff, data, dataoff,
f587de0e
PM		 448 &olc->
449 reverseLogicalChannelParameters.
450 multiplexParameters.
451 h2250LogicalChannelParameters);
452 if (ret < 0)
453 return -1;
454 }
455
456 if ((olc->options & eOpenLogicalChannel_separateStack) &&
457 olc->forwardLogicalChannelParameters.dataType.choice ==
458 eDataType_data &&
459 olc->forwardLogicalChannelParameters.dataType.data.application.
460 choice == eDataApplicationCapability_application_t120 &&
461 olc->forwardLogicalChannelParameters.dataType.data.application.
462 t120.choice == eDataProtocolCapability_separateLANStack &&
463 olc->separateStack.networkAddress.choice ==
464 eNetworkAccessParameters_networkAddress_localAreaAddress) {
051966c0 465 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 466 &olc->separateStack.networkAddress.
467 localAreaAddress);
468 if (ret < 0)
469 return -1;
470 }
471
472 return 0;
473}
474
475/****************************************************************************/
3db05fea 476static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 477 enum ip_conntrack_info ctinfo,
051966c0 478 unsigned int protoff, unsigned char **data, int dataoff,
f587de0e
PM		 479 OpenLogicalChannelAck *olca)
480{
481 H2250LogicalChannelAckParameters *ack;
482 int ret;
483
0d53778e 484 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
f587de0e
PM		 485
486 if ((olca->options &
487 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
488 (olca->reverseLogicalChannelParameters.options &
489 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
490 && (olca->reverseLogicalChannelParameters.multiplexParameters.
491 choice ==
492 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
493 {
051966c0
PM		 494 ret = process_h245_channel(skb, ct, ctinfo,
495 protoff, data, dataoff,
f587de0e
PM		 496 &olca->
497 reverseLogicalChannelParameters.
498 multiplexParameters.
499 h2250LogicalChannelParameters);
500 if (ret < 0)
501 return -1;
502 }
503
504 if ((olca->options &
505 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
506 (olca->forwardMultiplexAckParameters.choice ==
507 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
508 {
509 ack = &olca->forwardMultiplexAckParameters.
510 h2250LogicalChannelAckParameters;
511 if (ack->options &
512 eH2250LogicalChannelAckParameters_mediaChannel) {
513 /* RTP */
051966c0
PM		 514 ret = expect_rtp_rtcp(skb, ct, ctinfo,
515 protoff, data, dataoff,
f587de0e
PM		 516 &ack->mediaChannel);
517 if (ret < 0)
518 return -1;
519 }
520
521 if (ack->options &
522 eH2250LogicalChannelAckParameters_mediaControlChannel) {
523 /* RTCP */
051966c0
PM		 524 ret = expect_rtp_rtcp(skb, ct, ctinfo,
525 protoff, data, dataoff,
f587de0e
PM		 526 &ack->mediaControlChannel);
527 if (ret < 0)
528 return -1;
529 }
530 }
531
f8f1c08e
JMZ		 532 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
533 olca->separateStack.networkAddress.choice ==
534 eNetworkAccessParameters_networkAddress_localAreaAddress) {
051966c0 535 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
f8f1c08e
JMZ		 536 &olca->separateStack.networkAddress.
537 localAreaAddress);
538 if (ret < 0)
539 return -1;
540 }
541
f587de0e
PM		 542 return 0;
543}
544
545/****************************************************************************/
3db05fea 546static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 547 enum ip_conntrack_info ctinfo,
051966c0 548 unsigned int protoff, unsigned char **data, int dataoff,
f587de0e
PM		 549 MultimediaSystemControlMessage *mscm)
550{
551 switch (mscm->choice) {
552 case eMultimediaSystemControlMessage_request:
553 if (mscm->request.choice ==
554 eRequestMessage_openLogicalChannel) {
051966c0
PM		 555 return process_olc(skb, ct, ctinfo,
556 protoff, data, dataoff,
f587de0e
PM		 557 &mscm->request.openLogicalChannel);
558 }
0d53778e
PM		 559 pr_debug("nf_ct_h323: H.245 Request %d\n",
560 mscm->request.choice);
f587de0e
PM		 561 break;
562 case eMultimediaSystemControlMessage_response:
563 if (mscm->response.choice ==
564 eResponseMessage_openLogicalChannelAck) {
051966c0
PM		 565 return process_olca(skb, ct, ctinfo,
566 protoff, data, dataoff,
f587de0e
PM		 567 &mscm->response.
568 openLogicalChannelAck);
569 }
0d53778e
PM		 570 pr_debug("nf_ct_h323: H.245 Response %d\n",
571 mscm->response.choice);
f587de0e
PM		 572 break;
573 default:
0d53778e 574 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
f587de0e
PM		 575 break;
576 }
577
578 return 0;
579}
580
581/****************************************************************************/
3db05fea 582static int h245_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 583 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
584{
585 static MultimediaSystemControlMessage mscm;
586 unsigned char *data = NULL;
587 int datalen;
588 int dataoff;
589 int ret;
590
591 /* Until there's been traffic both ways, don't look in packets. */
fb048833 592 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
f587de0e 593 return NF_ACCEPT;
fb048833 594
3db05fea 595 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
f587de0e
PM		 596
597 spin_lock_bh(&nf_h323_lock);
598
599 /* Process each TPKT */
3db05fea 600 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 601 &data, &datalen, &dataoff)) {
0d53778e 602 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
3c9fba65 603 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 604
605 /* Decode H.245 signal */
606 ret = DecodeMultimediaSystemControlMessage(data, datalen,
607 &mscm);
608 if (ret < 0) {
0d53778e
PM		 609 pr_debug("nf_ct_h245: decoding error: %s\n",
610 ret == H323_ERROR_BOUND ?
611 "out of bound" : "out of range");
f587de0e
PM		 612 /* We don't drop when decoding error */
613 break;
614 }
615
616 /* Process H.245 signal */
051966c0
PM		 617 if (process_h245(skb, ct, ctinfo, protoff,
618 &data, dataoff, &mscm) < 0)
f587de0e
PM		 619 goto drop;
620 }
621
622 spin_unlock_bh(&nf_h323_lock);
623 return NF_ACCEPT;
624
625 drop:
626 spin_unlock_bh(&nf_h323_lock);
b20ab9cc 627 nf_ct_helper_log(skb, ct, "cannot process H.245 message");
f587de0e
PM		 628 return NF_DROP;
629}
630
631/****************************************************************************/
6002f266
PM		 632static const struct nf_conntrack_expect_policy h245_exp_policy = {
633 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
634 .timeout = 240,
635};
636
f587de0e
PM		 637static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
638 .name = "H.245",
639 .me = THIS_MODULE,
1afc5679 640 .data_len = sizeof(struct nf_ct_h323_master),
a56b8f81 641 .tuple.src.l3num = AF_UNSPEC,
f587de0e 642 .tuple.dst.protonum = IPPROTO_UDP,
6002f266
PM		 643 .help = h245_help,
644 .expect_policy = &h245_exp_policy,
f587de0e
PM		 645};
646
647/****************************************************************************/
648int get_h225_addr(struct nf_conn *ct, unsigned char *data,
649 TransportAddress *taddr,
643a2c15 650 union nf_inet_addr *addr, __be16 *port)
f587de0e 651{
905e3e8e 652 const unsigned char *p;
f587de0e
PM		 653 int len;
654
655 switch (taddr->choice) {
656 case eTransportAddress_ipAddress:
5e8fbe2a 657 if (nf_ct_l3num(ct) != AF_INET)
f587de0e
PM		 658 return 0;
659 p = data + taddr->ipAddress.ip;
660 len = 4;
661 break;
662 case eTransportAddress_ip6Address:
5e8fbe2a 663 if (nf_ct_l3num(ct) != AF_INET6)
f587de0e 664 return 0;
bb807245 665 p = data + taddr->ip6Address.ip;
f587de0e
PM		 666 len = 16;
667 break;
668 default:
669 return 0;
670 }
671
672 memcpy(addr, p, len);
673 memset((void *)addr + len, 0, sizeof(*addr) - len);
674 memcpy(port, p + len, sizeof(__be16));
675
676 return 1;
677}
678
679/****************************************************************************/
3db05fea 680static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 681 enum ip_conntrack_info ctinfo,
051966c0 682 unsigned int protoff, unsigned char **data, int dataoff,
f587de0e
PM		 683 TransportAddress *taddr)
684{
685 int dir = CTINFO2DIR(ctinfo);
686 int ret = 0;
687 __be16 port;
643a2c15 688 union nf_inet_addr addr;
f587de0e
PM		 689 struct nf_conntrack_expect *exp;
690 typeof(nat_h245_hook) nat_h245;
691
692 /* Read h245Address */
693 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
694 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
695 port == 0)
696 return 0;
697
698 /* Create expect for h245 connection */
6823645d 699 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 700 return -1;
5e8fbe2a 701 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 702 &ct->tuplehash[!dir].tuple.src.u3,
703 &ct->tuplehash[!dir].tuple.dst.u3,
704 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 705 exp->helper = &nf_conntrack_helper_h245;
706
707 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
708 &ct->tuplehash[!dir].tuple.dst.u3,
709 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
710 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
811927cc 711 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 712 ct->status & IPS_NAT_MASK) {
713 /* NAT needed */
051966c0 714 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
f587de0e
PM		 715 port, exp);
716 } else { /* Conntrack only */
6823645d 717 if (nf_ct_expect_related(exp) == 0) {
0d53778e 718 pr_debug("nf_ct_q931: expect H.245 ");
3c9fba65 719 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 720 } else
721 ret = -1;
722 }
723
6823645d 724 nf_ct_expect_put(exp);
f587de0e
PM		 725
726 return ret;
727}
728
729/* If the calling party is on the same side of the forward-to party,
730 * we don't need to track the second call */
905e3e8e 731static int callforward_do_filter(const union nf_inet_addr *src,
76108cea
JE		 732 const union nf_inet_addr *dst,
733 u_int8_t family)
f587de0e 734{
1e796fda 735 const struct nf_afinfo *afinfo;
f587de0e
PM		 736 int ret = 0;
737
1841a4c7
PM		 738 /* rcu_read_lock()ed by nf_hook_slow() */
739 afinfo = nf_get_afinfo(family);
740 if (!afinfo)
741 return 0;
742
f587de0e
PM		 743 switch (family) {
744 case AF_INET: {
5a49d0e0 745 struct flowi4 fl1, fl2;
f587de0e
PM		 746 struct rtable *rt1, *rt2;
747
5a49d0e0
DM		 748 memset(&fl1, 0, sizeof(fl1));
749 fl1.daddr = src->ip;
750
751 memset(&fl2, 0, sizeof(fl2));
752 fl2.daddr = dst->ip;
31ad3dd6 753 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
0fae2e77 754 flowi4_to_flowi(&fl1), false)) {
31ad3dd6 755 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
0fae2e77 756 flowi4_to_flowi(&fl2), false)) {
bbb5823c
JA		 757 if (rt_nexthop(rt1, fl1.daddr) ==
758 rt_nexthop(rt2, fl2.daddr) &&
d8d1f30b 759 rt1->dst.dev == rt2->dst.dev)
f587de0e 760 ret = 1;
d8d1f30b 761 dst_release(&rt2->dst);
f587de0e 762 }
d8d1f30b 763 dst_release(&rt1->dst);
f587de0e
PM		 764 }
765 break;
766 }
c0cd1156 767#if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
f587de0e 768 case AF_INET6: {
5a49d0e0 769 struct flowi6 fl1, fl2;
f587de0e
PM		 770 struct rt6_info *rt1, *rt2;
771
5a49d0e0 772 memset(&fl1, 0, sizeof(fl1));
4e3fd7a0 773 fl1.daddr = src->in6;
5a49d0e0
DM		 774
775 memset(&fl2, 0, sizeof(fl2));
4e3fd7a0 776 fl2.daddr = dst->in6;
31ad3dd6 777 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
0fae2e77 778 flowi6_to_flowi(&fl1), false)) {
31ad3dd6 779 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
0fae2e77 780 flowi6_to_flowi(&fl2), false)) {
56e42441
JA		 781 if (ipv6_addr_equal(rt6_nexthop(rt1),
782 rt6_nexthop(rt2)) &&
d8d1f30b 783 rt1->dst.dev == rt2->dst.dev)
f587de0e 784 ret = 1;
d8d1f30b 785 dst_release(&rt2->dst);
f587de0e 786 }
d8d1f30b 787 dst_release(&rt1->dst);
f587de0e
PM		 788 }
789 break;
790 }
791#endif
792 }
793 return ret;
794
795}
796
797/****************************************************************************/
3db05fea 798static int expect_callforwarding(struct sk_buff *skb,
f587de0e
PM		 799 struct nf_conn *ct,
800 enum ip_conntrack_info ctinfo,
051966c0 801 unsigned int protoff,
f587de0e
PM		 802 unsigned char **data, int dataoff,
803 TransportAddress *taddr)
804{
805 int dir = CTINFO2DIR(ctinfo);
806 int ret = 0;
807 __be16 port;
643a2c15 808 union nf_inet_addr addr;
f587de0e
PM		 809 struct nf_conntrack_expect *exp;
810 typeof(nat_callforwarding_hook) nat_callforwarding;
811
812 /* Read alternativeAddress */
813 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
814 return 0;
815
816 /* If the calling party is on the same side of the forward-to party,
817 * we don't need to track the second call */
818 if (callforward_filter &&
819 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
5e8fbe2a 820 nf_ct_l3num(ct))) {
0d53778e 821 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
f587de0e
PM		 822 return 0;
823 }
824
825 /* Create expect for the second call leg */
6823645d 826 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 827 return -1;
5e8fbe2a 828 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 829 &ct->tuplehash[!dir].tuple.src.u3, &addr,
830 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 831 exp->helper = nf_conntrack_helper_q931;
832
833 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
834 &ct->tuplehash[!dir].tuple.dst.u3,
835 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
836 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
811927cc 837 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 838 ct->status & IPS_NAT_MASK) {
839 /* Need NAT */
051966c0
PM		 840 ret = nat_callforwarding(skb, ct, ctinfo,
841 protoff, data, dataoff,
f587de0e
PM		 842 taddr, port, exp);
843 } else { /* Conntrack only */
6823645d 844 if (nf_ct_expect_related(exp) == 0) {
0d53778e 845 pr_debug("nf_ct_q931: expect Call Forwarding ");
3c9fba65 846 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 847 } else
848 ret = -1;
849 }
850
6823645d 851 nf_ct_expect_put(exp);
f587de0e
PM		 852
853 return ret;
854}
855
856/****************************************************************************/
3db05fea 857static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 858 enum ip_conntrack_info ctinfo,
051966c0 859 unsigned int protoff,
f587de0e
PM		 860 unsigned char **data, int dataoff,
861 Setup_UUIE *setup)
862{
863 int dir = CTINFO2DIR(ctinfo);
864 int ret;
865 int i;
866 __be16 port;
643a2c15 867 union nf_inet_addr addr;
f587de0e
PM		 868 typeof(set_h225_addr_hook) set_h225_addr;
869
0d53778e 870 pr_debug("nf_ct_q931: Setup\n");
f587de0e
PM		 871
872 if (setup->options & eSetup_UUIE_h245Address) {
051966c0 873 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 874 &setup->h245Address);
875 if (ret < 0)
876 return -1;
877 }
878
879 set_h225_addr = rcu_dereference(set_h225_addr_hook);
880 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
811927cc
PM		 881 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
882 ct->status & IPS_NAT_MASK &&
f587de0e 883 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
601e68e1 884 &addr, &port) &&
f587de0e 885 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
5b095d98 886 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 887 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
0d53778e 888 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
051966c0 889 ret = set_h225_addr(skb, protoff, data, dataoff,
f587de0e
PM		 890 &setup->destCallSignalAddress,
891 &ct->tuplehash[!dir].tuple.src.u3,
892 ct->tuplehash[!dir].tuple.src.u.tcp.port);
893 if (ret < 0)
894 return -1;
895 }
896
897 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
811927cc
PM		 898 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
899 ct->status & IPS_NAT_MASK &&
f587de0e 900 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
601e68e1 901 &addr, &port) &&
f587de0e 902 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
5b095d98 903 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 904 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
0d53778e 905 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
051966c0 906 ret = set_h225_addr(skb, protoff, data, dataoff,
f587de0e
PM		 907 &setup->sourceCallSignalAddress,
908 &ct->tuplehash[!dir].tuple.dst.u3,
909 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
910 if (ret < 0)
911 return -1;
912 }
913
914 if (setup->options & eSetup_UUIE_fastStart) {
915 for (i = 0; i < setup->fastStart.count; i++) {
051966c0
PM		 916 ret = process_olc(skb, ct, ctinfo,
917 protoff, data, dataoff,
f587de0e
PM		 918 &setup->fastStart.item[i]);
919 if (ret < 0)
920 return -1;
921 }
922 }
923
924 return 0;
925}
926
927/****************************************************************************/
3db05fea 928static int process_callproceeding(struct sk_buff *skb,
f587de0e
PM		 929 struct nf_conn *ct,
930 enum ip_conntrack_info ctinfo,
051966c0 931 unsigned int protoff,
f587de0e
PM		 932 unsigned char **data, int dataoff,
933 CallProceeding_UUIE *callproc)
934{
935 int ret;
936 int i;
937
0d53778e 938 pr_debug("nf_ct_q931: CallProceeding\n");
f587de0e
PM		 939
940 if (callproc->options & eCallProceeding_UUIE_h245Address) {
051966c0 941 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 942 &callproc->h245Address);
943 if (ret < 0)
944 return -1;
945 }
946
947 if (callproc->options & eCallProceeding_UUIE_fastStart) {
948 for (i = 0; i < callproc->fastStart.count; i++) {
051966c0
PM		 949 ret = process_olc(skb, ct, ctinfo,
950 protoff, data, dataoff,
f587de0e
PM		 951 &callproc->fastStart.item[i]);
952 if (ret < 0)
953 return -1;
954 }
955 }
956
957 return 0;
958}
959
960/****************************************************************************/
3db05fea 961static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 962 enum ip_conntrack_info ctinfo,
051966c0 963 unsigned int protoff,
f587de0e
PM		 964 unsigned char **data, int dataoff,
965 Connect_UUIE *connect)
966{
967 int ret;
968 int i;
969
0d53778e 970 pr_debug("nf_ct_q931: Connect\n");
f587de0e
PM		 971
972 if (connect->options & eConnect_UUIE_h245Address) {
051966c0 973 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 974 &connect->h245Address);
975 if (ret < 0)
976 return -1;
977 }
978
979 if (connect->options & eConnect_UUIE_fastStart) {
980 for (i = 0; i < connect->fastStart.count; i++) {
051966c0
PM		 981 ret = process_olc(skb, ct, ctinfo,
982 protoff, data, dataoff,
f587de0e
PM		 983 &connect->fastStart.item[i]);
984 if (ret < 0)
985 return -1;
986 }
987 }
988
989 return 0;
990}
991
992/****************************************************************************/
3db05fea 993static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 994 enum ip_conntrack_info ctinfo,
051966c0 995 unsigned int protoff,
f587de0e
PM		 996 unsigned char **data, int dataoff,
997 Alerting_UUIE *alert)
998{
999 int ret;
1000 int i;
1001
0d53778e 1002 pr_debug("nf_ct_q931: Alerting\n");
f587de0e
PM		 1003
1004 if (alert->options & eAlerting_UUIE_h245Address) {
051966c0 1005 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1006 &alert->h245Address);
1007 if (ret < 0)
1008 return -1;
1009 }
1010
1011 if (alert->options & eAlerting_UUIE_fastStart) {
1012 for (i = 0; i < alert->fastStart.count; i++) {
051966c0
PM		 1013 ret = process_olc(skb, ct, ctinfo,
1014 protoff, data, dataoff,
f587de0e
PM		 1015 &alert->fastStart.item[i]);
1016 if (ret < 0)
1017 return -1;
1018 }
1019 }
1020
1021 return 0;
1022}
1023
f587de0e 1024/****************************************************************************/
3db05fea 1025static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1026 enum ip_conntrack_info ctinfo,
051966c0 1027 unsigned int protoff,
f587de0e
PM		 1028 unsigned char **data, int dataoff,
1029 Facility_UUIE *facility)
1030{
1031 int ret;
1032 int i;
1033
0d53778e 1034 pr_debug("nf_ct_q931: Facility\n");
f587de0e
PM		 1035
1036 if (facility->reason.choice == eFacilityReason_callForwarded) {
1037 if (facility->options & eFacility_UUIE_alternativeAddress)
051966c0
PM		 1038 return expect_callforwarding(skb, ct, ctinfo,
1039 protoff, data, dataoff,
f587de0e
PM		 1040 &facility->
1041 alternativeAddress);
1042 return 0;
1043 }
1044
1045 if (facility->options & eFacility_UUIE_h245Address) {
051966c0 1046 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1047 &facility->h245Address);
1048 if (ret < 0)
1049 return -1;
1050 }
1051
1052 if (facility->options & eFacility_UUIE_fastStart) {
1053 for (i = 0; i < facility->fastStart.count; i++) {
051966c0
PM		 1054 ret = process_olc(skb, ct, ctinfo,
1055 protoff, data, dataoff,
f587de0e
PM		 1056 &facility->fastStart.item[i]);
1057 if (ret < 0)
1058 return -1;
1059 }
1060 }
1061
1062 return 0;
1063}
1064
1065/****************************************************************************/
3db05fea 1066static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1067 enum ip_conntrack_info ctinfo,
051966c0 1068 unsigned int protoff,
f587de0e
PM		 1069 unsigned char **data, int dataoff,
1070 Progress_UUIE *progress)
1071{
1072 int ret;
1073 int i;
1074
0d53778e 1075 pr_debug("nf_ct_q931: Progress\n");
f587de0e
PM		 1076
1077 if (progress->options & eProgress_UUIE_h245Address) {
051966c0 1078 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1079 &progress->h245Address);
1080 if (ret < 0)
1081 return -1;
1082 }
1083
1084 if (progress->options & eProgress_UUIE_fastStart) {
1085 for (i = 0; i < progress->fastStart.count; i++) {
051966c0
PM		 1086 ret = process_olc(skb, ct, ctinfo,
1087 protoff, data, dataoff,
f587de0e
PM		 1088 &progress->fastStart.item[i]);
1089 if (ret < 0)
1090 return -1;
1091 }
1092 }
1093
1094 return 0;
1095}
1096
1097/****************************************************************************/
3db05fea 1098static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1099 enum ip_conntrack_info ctinfo,
051966c0
PM		 1100 unsigned int protoff, unsigned char **data, int dataoff,
1101 Q931 *q931)
f587de0e
PM		 1102{
1103 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1104 int i;
1105 int ret = 0;
1106
1107 switch (pdu->h323_message_body.choice) {
1108 case eH323_UU_PDU_h323_message_body_setup:
051966c0 1109 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1110 &pdu->h323_message_body.setup);
1111 break;
1112 case eH323_UU_PDU_h323_message_body_callProceeding:
051966c0
PM		 1113 ret = process_callproceeding(skb, ct, ctinfo,
1114 protoff, data, dataoff,
f587de0e
PM		 1115 &pdu->h323_message_body.
1116 callProceeding);
1117 break;
1118 case eH323_UU_PDU_h323_message_body_connect:
051966c0 1119 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1120 &pdu->h323_message_body.connect);
1121 break;
1122 case eH323_UU_PDU_h323_message_body_alerting:
051966c0 1123 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1124 &pdu->h323_message_body.alerting);
1125 break;
f587de0e 1126 case eH323_UU_PDU_h323_message_body_facility:
051966c0 1127 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1128 &pdu->h323_message_body.facility);
1129 break;
1130 case eH323_UU_PDU_h323_message_body_progress:
051966c0 1131 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1132 &pdu->h323_message_body.progress);
1133 break;
1134 default:
0d53778e
PM		 1135 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1136 pdu->h323_message_body.choice);
f587de0e
PM		 1137 break;
1138 }
1139
1140 if (ret < 0)
1141 return -1;
1142
1143 if (pdu->options & eH323_UU_PDU_h245Control) {
1144 for (i = 0; i < pdu->h245Control.count; i++) {
051966c0
PM		 1145 ret = process_h245(skb, ct, ctinfo,
1146 protoff, data, dataoff,
f587de0e
PM		 1147 &pdu->h245Control.item[i]);
1148 if (ret < 0)
1149 return -1;
1150 }
1151 }
1152
1153 return 0;
1154}
1155
1156/****************************************************************************/
3db05fea 1157static int q931_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1158 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1159{
1160 static Q931 q931;
1161 unsigned char *data = NULL;
1162 int datalen;
1163 int dataoff;
1164 int ret;
1165
1166 /* Until there's been traffic both ways, don't look in packets. */
fb048833 1167 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
f587de0e 1168 return NF_ACCEPT;
fb048833 1169
3db05fea 1170 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
f587de0e
PM		 1171
1172 spin_lock_bh(&nf_h323_lock);
1173
1174 /* Process each TPKT */
3db05fea 1175 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 1176 &data, &datalen, &dataoff)) {
0d53778e 1177 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
3c9fba65 1178 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1179
1180 /* Decode Q.931 signal */
1181 ret = DecodeQ931(data, datalen, &q931);
1182 if (ret < 0) {
0d53778e
PM		 1183 pr_debug("nf_ct_q931: decoding error: %s\n",
1184 ret == H323_ERROR_BOUND ?
1185 "out of bound" : "out of range");
f587de0e
PM		 1186 /* We don't drop when decoding error */
1187 break;
1188 }
1189
1190 /* Process Q.931 signal */
051966c0
PM		 1191 if (process_q931(skb, ct, ctinfo, protoff,
1192 &data, dataoff, &q931) < 0)
f587de0e
PM		 1193 goto drop;
1194 }
1195
1196 spin_unlock_bh(&nf_h323_lock);
1197 return NF_ACCEPT;
1198
1199 drop:
1200 spin_unlock_bh(&nf_h323_lock);
b20ab9cc 1201 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
f587de0e
PM		 1202 return NF_DROP;
1203}
1204
1205/****************************************************************************/
6002f266
PM		 1206static const struct nf_conntrack_expect_policy q931_exp_policy = {
1207 /* T.120 and H.245 */
1208 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1209 .timeout = 240,
1210};
1211
f587de0e
PM		 1212static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1213 {
1214 .name = "Q.931",
1215 .me = THIS_MODULE,
1afc5679 1216 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1217 .tuple.src.l3num = AF_INET,
09640e63 1218 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1219 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1220 .help = q931_help,
1221 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1222 },
1223 {
1224 .name = "Q.931",
1225 .me = THIS_MODULE,
f587de0e 1226 .tuple.src.l3num = AF_INET6,
09640e63 1227 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1228 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1229 .help = q931_help,
1230 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1231 },
1232};
1233
1234/****************************************************************************/
3db05fea 1235static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1236 int *datalen)
1237{
905e3e8e
JE		 1238 const struct udphdr *uh;
1239 struct udphdr _uh;
f587de0e
PM		 1240 int dataoff;
1241
3db05fea 1242 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1243 if (uh == NULL)
1244 return NULL;
1245 dataoff = protoff + sizeof(_uh);
3db05fea 1246 if (dataoff >= skb->len)
f587de0e 1247 return NULL;
3db05fea
HX		 1248 *datalen = skb->len - dataoff;
1249 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1250}
1251
1252/****************************************************************************/
1253static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
643a2c15 1254 union nf_inet_addr *addr,
f587de0e
PM		 1255 __be16 port)
1256{
84541cc1 1257 struct net *net = nf_ct_net(ct);
f587de0e
PM		 1258 struct nf_conntrack_expect *exp;
1259 struct nf_conntrack_tuple tuple;
1260
1261 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1262 tuple.src.u.tcp.port = 0;
1263 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1264 tuple.dst.u.tcp.port = port;
1265 tuple.dst.protonum = IPPROTO_TCP;
1266
5d0aa2cc 1267 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
f587de0e
PM		 1268 if (exp && exp->master == ct)
1269 return exp;
1270 return NULL;
1271}
1272
1273/****************************************************************************/
1274static int set_expect_timeout(struct nf_conntrack_expect *exp,
95c96174 1275 unsigned int timeout)
f587de0e
PM		 1276{
1277 if (!exp || !del_timer(&exp->timeout))
1278 return 0;
1279
1280 exp->timeout.expires = jiffies + timeout * HZ;
1281 add_timer(&exp->timeout);
1282
1283 return 1;
1284}
1285
1286/****************************************************************************/
3db05fea 1287static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1288 enum ip_conntrack_info ctinfo,
051966c0 1289 unsigned int protoff, unsigned char **data,
f587de0e
PM		 1290 TransportAddress *taddr, int count)
1291{
1afc5679 1292 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1293 int dir = CTINFO2DIR(ctinfo);
1294 int ret = 0;
1295 int i;
1296 __be16 port;
643a2c15 1297 union nf_inet_addr addr;
f587de0e
PM		 1298 struct nf_conntrack_expect *exp;
1299 typeof(nat_q931_hook) nat_q931;
1300
1301 /* Look for the first related address */
1302 for (i = 0; i < count; i++) {
1303 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1304 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1305 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1306 break;
1307 }
1308
1309 if (i >= count) /* Not found */
1310 return 0;
1311
1312 /* Create expect for Q.931 */
6823645d 1313 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1314 return -1;
5e8fbe2a 1315 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1316 gkrouted_only ? /* only accept calls from GK? */
1317 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1318 &ct->tuplehash[!dir].tuple.dst.u3,
1319 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1320 exp->helper = nf_conntrack_helper_q931;
1321 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1322
1323 nat_q931 = rcu_dereference(nat_q931_hook);
811927cc
PM		 1324 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1325 ct->status & IPS_NAT_MASK) { /* Need NAT */
051966c0
PM		 1326 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1327 taddr, i, port, exp);
f587de0e 1328 } else { /* Conntrack only */
6823645d 1329 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1330 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1331 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1332
1333 /* Save port for looking up expect in processing RCF */
1334 info->sig_port[dir] = port;
1335 } else
1336 ret = -1;
1337 }
1338
6823645d 1339 nf_ct_expect_put(exp);
f587de0e
PM		 1340
1341 return ret;
1342}
1343
1344/****************************************************************************/
3db05fea 1345static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1346 enum ip_conntrack_info ctinfo,
051966c0 1347 unsigned int protoff,
f587de0e
PM		 1348 unsigned char **data, GatekeeperRequest *grq)
1349{
1350 typeof(set_ras_addr_hook) set_ras_addr;
1351
0d53778e 1352 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1353
1354 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1355 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1356 ct->status & IPS_NAT_MASK) /* NATed */
051966c0 1357 return set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1358 &grq->rasAddress, 1);
1359 return 0;
1360}
1361
1362/****************************************************************************/
3db05fea 1363static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1364 enum ip_conntrack_info ctinfo,
051966c0 1365 unsigned int protoff,
f587de0e
PM		 1366 unsigned char **data, GatekeeperConfirm *gcf)
1367{
1368 int dir = CTINFO2DIR(ctinfo);
1369 int ret = 0;
1370 __be16 port;
643a2c15 1371 union nf_inet_addr addr;
f587de0e
PM		 1372 struct nf_conntrack_expect *exp;
1373
0d53778e 1374 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1375
1376 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1377 return 0;
1378
1379 /* Registration port is the same as discovery port */
1380 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1381 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1382 return 0;
1383
1384 /* Avoid RAS expectation loops. A GCF is never expected. */
1385 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1386 return 0;
1387
1388 /* Need new expect */
6823645d 1389 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1390 return -1;
5e8fbe2a 1391 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1392 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1393 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1394 exp->helper = nf_conntrack_helper_ras;
1395
6823645d 1396 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1397 pr_debug("nf_ct_ras: expect RAS ");
3c9fba65 1398 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1399 } else
1400 ret = -1;
1401
6823645d 1402 nf_ct_expect_put(exp);
f587de0e
PM		 1403
1404 return ret;
1405}
1406
1407/****************************************************************************/
3db05fea 1408static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1409 enum ip_conntrack_info ctinfo,
051966c0 1410 unsigned int protoff,
f587de0e
PM		 1411 unsigned char **data, RegistrationRequest *rrq)
1412{
1afc5679 1413 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1414 int ret;
1415 typeof(set_ras_addr_hook) set_ras_addr;
1416
0d53778e 1417 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1418
051966c0 1419 ret = expect_q931(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1420 rrq->callSignalAddress.item,
1421 rrq->callSignalAddress.count);
1422 if (ret < 0)
1423 return -1;
1424
1425 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1426 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1427 ct->status & IPS_NAT_MASK) {
051966c0 1428 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1429 rrq->rasAddress.item,
1430 rrq->rasAddress.count);
1431 if (ret < 0)
1432 return -1;
1433 }
1434
1435 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1436 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1437 info->timeout = rrq->timeToLive;
1438 } else
1439 info->timeout = default_rrq_ttl;
1440
1441 return 0;
1442}
1443
1444/****************************************************************************/
3db05fea 1445static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1446 enum ip_conntrack_info ctinfo,
051966c0 1447 unsigned int protoff,
f587de0e
PM		 1448 unsigned char **data, RegistrationConfirm *rcf)
1449{
1afc5679 1450 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1451 int dir = CTINFO2DIR(ctinfo);
1452 int ret;
1453 struct nf_conntrack_expect *exp;
1454 typeof(set_sig_addr_hook) set_sig_addr;
1455
0d53778e 1456 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1457
1458 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1459 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1460 ct->status & IPS_NAT_MASK) {
051966c0 1461 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1462 rcf->callSignalAddress.item,
1463 rcf->callSignalAddress.count);
1464 if (ret < 0)
1465 return -1;
1466 }
1467
1468 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1469 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1470 info->timeout = rcf->timeToLive;
1471 }
1472
1473 if (info->timeout > 0) {
0d53778e
PM		 1474 pr_debug("nf_ct_ras: set RAS connection timeout to "
1475 "%u seconds\n", info->timeout);
3db05fea 1476 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1477
1478 /* Set expect timeout */
ca7433df 1479 spin_lock_bh(&nf_conntrack_expect_lock);
f587de0e
PM		 1480 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1481 info->sig_port[!dir]);
1482 if (exp) {
0d53778e
PM		 1483 pr_debug("nf_ct_ras: set Q.931 expect "
1484 "timeout to %u seconds for",
1485 info->timeout);
3c9fba65 1486 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1487 set_expect_timeout(exp, info->timeout);
1488 }
ca7433df 1489 spin_unlock_bh(&nf_conntrack_expect_lock);
f587de0e
PM		 1490 }
1491
1492 return 0;
1493}
1494
1495/****************************************************************************/
3db05fea 1496static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1497 enum ip_conntrack_info ctinfo,
051966c0 1498 unsigned int protoff,
f587de0e
PM		 1499 unsigned char **data, UnregistrationRequest *urq)
1500{
1afc5679 1501 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1502 int dir = CTINFO2DIR(ctinfo);
1503 int ret;
1504 typeof(set_sig_addr_hook) set_sig_addr;
1505
0d53778e 1506 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1507
1508 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1509 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1510 ct->status & IPS_NAT_MASK) {
051966c0 1511 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1512 urq->callSignalAddress.item,
1513 urq->callSignalAddress.count);
1514 if (ret < 0)
1515 return -1;
1516 }
1517
1518 /* Clear old expect */
1519 nf_ct_remove_expectations(ct);
1520 info->sig_port[dir] = 0;
1521 info->sig_port[!dir] = 0;
1522
1523 /* Give it 30 seconds for UCF or URJ */
3db05fea 1524 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1525
1526 return 0;
1527}
1528
1529/****************************************************************************/
3db05fea 1530static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1531 enum ip_conntrack_info ctinfo,
051966c0 1532 unsigned int protoff,
f587de0e
PM		 1533 unsigned char **data, AdmissionRequest *arq)
1534{
1afc5679 1535 const struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1536 int dir = CTINFO2DIR(ctinfo);
1537 __be16 port;
643a2c15 1538 union nf_inet_addr addr;
f587de0e
PM		 1539 typeof(set_h225_addr_hook) set_h225_addr;
1540
0d53778e 1541 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1542
1543 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1544 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1545 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1546 &addr, &port) &&
f587de0e
PM		 1547 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1548 port == info->sig_port[dir] &&
811927cc 1549 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 1550 set_h225_addr && ct->status & IPS_NAT_MASK) {
1551 /* Answering ARQ */
051966c0 1552 return set_h225_addr(skb, protoff, data, 0,
f587de0e
PM		 1553 &arq->destCallSignalAddress,
1554 &ct->tuplehash[!dir].tuple.dst.u3,
1555 info->sig_port[!dir]);
1556 }
1557
1558 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1559 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1560 &addr, &port) &&
f587de0e 1561 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
811927cc
PM		 1562 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1563 ct->status & IPS_NAT_MASK) {
f587de0e 1564 /* Calling ARQ */
051966c0 1565 return set_h225_addr(skb, protoff, data, 0,
f587de0e
PM		 1566 &arq->srcCallSignalAddress,
1567 &ct->tuplehash[!dir].tuple.dst.u3,
1568 port);
1569 }
1570
1571 return 0;
1572}
1573
1574/****************************************************************************/
3db05fea 1575static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1576 enum ip_conntrack_info ctinfo,
051966c0 1577 unsigned int protoff,
f587de0e
PM		 1578 unsigned char **data, AdmissionConfirm *acf)
1579{
1580 int dir = CTINFO2DIR(ctinfo);
1581 int ret = 0;
1582 __be16 port;
643a2c15 1583 union nf_inet_addr addr;
f587de0e
PM		 1584 struct nf_conntrack_expect *exp;
1585 typeof(set_sig_addr_hook) set_sig_addr;
1586
0d53778e 1587 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1588
1589 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1590 &addr, &port))
1591 return 0;
1592
1593 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1594 /* Answering ACF */
1595 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1596 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1597 ct->status & IPS_NAT_MASK)
051966c0 1598 return set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1599 &acf->destCallSignalAddress, 1);
1600 return 0;
1601 }
1602
1603 /* Need new expect */
6823645d 1604 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1605 return -1;
5e8fbe2a 1606 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1607 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1608 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1609 exp->flags = NF_CT_EXPECT_PERMANENT;
1610 exp->helper = nf_conntrack_helper_q931;
1611
6823645d 1612 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1613 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1614 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1615 } else
1616 ret = -1;
1617
6823645d 1618 nf_ct_expect_put(exp);
f587de0e
PM		 1619
1620 return ret;
1621}
1622
1623/****************************************************************************/
3db05fea 1624static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1625 enum ip_conntrack_info ctinfo,
051966c0 1626 unsigned int protoff,
f587de0e
PM		 1627 unsigned char **data, LocationRequest *lrq)
1628{
1629 typeof(set_ras_addr_hook) set_ras_addr;
1630
0d53778e 1631 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1632
1633 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1634 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1635 ct->status & IPS_NAT_MASK)
051966c0 1636 return set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1637 &lrq->replyAddress, 1);
1638 return 0;
1639}
1640
1641/****************************************************************************/
3db05fea 1642static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1643 enum ip_conntrack_info ctinfo,
051966c0 1644 unsigned int protoff,
f587de0e
PM		 1645 unsigned char **data, LocationConfirm *lcf)
1646{
1647 int dir = CTINFO2DIR(ctinfo);
1648 int ret = 0;
1649 __be16 port;
643a2c15 1650 union nf_inet_addr addr;
f587de0e
PM		 1651 struct nf_conntrack_expect *exp;
1652
0d53778e 1653 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1654
1655 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1656 &addr, &port))
1657 return 0;
1658
1659 /* Need new expect for call signal */
6823645d 1660 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1661 return -1;
5e8fbe2a 1662 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1663 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1664 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1665 exp->flags = NF_CT_EXPECT_PERMANENT;
1666 exp->helper = nf_conntrack_helper_q931;
1667
6823645d 1668 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1669 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1670 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1671 } else
1672 ret = -1;
1673
6823645d 1674 nf_ct_expect_put(exp);
f587de0e
PM		 1675
1676 /* Ignore rasAddress */
1677
1678 return ret;
1679}
1680
1681/****************************************************************************/
3db05fea 1682static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1683 enum ip_conntrack_info ctinfo,
051966c0 1684 unsigned int protoff,
f587de0e
PM		 1685 unsigned char **data, InfoRequestResponse *irr)
1686{
1687 int ret;
1688 typeof(set_ras_addr_hook) set_ras_addr;
1689 typeof(set_sig_addr_hook) set_sig_addr;
1690
0d53778e 1691 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1692
1693 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1694 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1695 ct->status & IPS_NAT_MASK) {
051966c0 1696 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1697 &irr->rasAddress, 1);
1698 if (ret < 0)
1699 return -1;
1700 }
1701
1702 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1703 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1704 ct->status & IPS_NAT_MASK) {
051966c0 1705 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1706 irr->callSignalAddress.item,
1707 irr->callSignalAddress.count);
1708 if (ret < 0)
1709 return -1;
1710 }
1711
1712 return 0;
1713}
1714
1715/****************************************************************************/
3db05fea 1716static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1717 enum ip_conntrack_info ctinfo,
051966c0 1718 unsigned int protoff,
f587de0e
PM		 1719 unsigned char **data, RasMessage *ras)
1720{
1721 switch (ras->choice) {
1722 case eRasMessage_gatekeeperRequest:
051966c0 1723 return process_grq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1724 &ras->gatekeeperRequest);
1725 case eRasMessage_gatekeeperConfirm:
051966c0 1726 return process_gcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1727 &ras->gatekeeperConfirm);
1728 case eRasMessage_registrationRequest:
051966c0 1729 return process_rrq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1730 &ras->registrationRequest);
1731 case eRasMessage_registrationConfirm:
051966c0 1732 return process_rcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1733 &ras->registrationConfirm);
1734 case eRasMessage_unregistrationRequest:
051966c0 1735 return process_urq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1736 &ras->unregistrationRequest);
1737 case eRasMessage_admissionRequest:
051966c0 1738 return process_arq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1739 &ras->admissionRequest);
1740 case eRasMessage_admissionConfirm:
051966c0 1741 return process_acf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1742 &ras->admissionConfirm);
1743 case eRasMessage_locationRequest:
051966c0 1744 return process_lrq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1745 &ras->locationRequest);
1746 case eRasMessage_locationConfirm:
051966c0 1747 return process_lcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1748 &ras->locationConfirm);
1749 case eRasMessage_infoRequestResponse:
051966c0 1750 return process_irr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1751 &ras->infoRequestResponse);
1752 default:
0d53778e 1753 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1754 break;
1755 }
1756
1757 return 0;
1758}
1759
1760/****************************************************************************/
3db05fea 1761static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1762 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1763{
1764 static RasMessage ras;
1765 unsigned char *data;
1766 int datalen = 0;
1767 int ret;
1768
3db05fea 1769 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1770
1771 spin_lock_bh(&nf_h323_lock);
1772
1773 /* Get UDP data */
3db05fea 1774 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1775 if (data == NULL)
1776 goto accept;
0d53778e 1777 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
3c9fba65 1778 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1779
1780 /* Decode RAS message */
1781 ret = DecodeRasMessage(data, datalen, &ras);
1782 if (ret < 0) {
0d53778e
PM		 1783 pr_debug("nf_ct_ras: decoding error: %s\n",
1784 ret == H323_ERROR_BOUND ?
1785 "out of bound" : "out of range");
f587de0e
PM		 1786 goto accept;
1787 }
1788
1789 /* Process RAS message */
051966c0 1790 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
f587de0e
PM		 1791 goto drop;
1792
1793 accept:
1794 spin_unlock_bh(&nf_h323_lock);
1795 return NF_ACCEPT;
1796
1797 drop:
1798 spin_unlock_bh(&nf_h323_lock);
b20ab9cc 1799 nf_ct_helper_log(skb, ct, "cannot process RAS message");
f587de0e
PM		 1800 return NF_DROP;
1801}
1802
1803/****************************************************************************/
6002f266
PM		 1804static const struct nf_conntrack_expect_policy ras_exp_policy = {
1805 .max_expected = 32,
1806 .timeout = 240,
1807};
1808
f587de0e
PM		 1809static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1810 {
1811 .name = "RAS",
1812 .me = THIS_MODULE,
1afc5679 1813 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1814 .tuple.src.l3num = AF_INET,
09640e63 1815 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1816 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1817 .help = ras_help,
6002f266 1818 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1819 },
1820 {
1821 .name = "RAS",
1822 .me = THIS_MODULE,
1afc5679 1823 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1824 .tuple.src.l3num = AF_INET6,
09640e63 1825 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1826 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1827 .help = ras_help,
6002f266 1828 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1829 },
1830};
1831
1832/****************************************************************************/
1833static void __exit nf_conntrack_h323_fini(void)
1834{
1835 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1836 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1837 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1838 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81 1839 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1840 kfree(h323_buffer);
0d53778e 1841 pr_debug("nf_ct_h323: fini\n");
f587de0e
PM		 1842}
1843
1844/****************************************************************************/
1845static int __init nf_conntrack_h323_init(void)
1846{
1847 int ret;
1848
1849 h323_buffer = kmalloc(65536, GFP_KERNEL);
1850 if (!h323_buffer)
1851 return -ENOMEM;
a56b8f81 1852 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
f587de0e
PM		 1853 if (ret < 0)
1854 goto err1;
a56b8f81 1855 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
f587de0e
PM		 1856 if (ret < 0)
1857 goto err2;
a56b8f81 1858 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
f587de0e
PM		 1859 if (ret < 0)
1860 goto err3;
a56b8f81 1861 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
f587de0e
PM		 1862 if (ret < 0)
1863 goto err4;
a56b8f81
PM		 1864 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1865 if (ret < 0)
1866 goto err5;
0d53778e 1867 pr_debug("nf_ct_h323: init success\n");
f587de0e
PM		 1868 return 0;
1869
a56b8f81 1870err5:
f587de0e 1871 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
a56b8f81 1872err4:
f587de0e 1873 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
a56b8f81 1874err3:
f587de0e 1875 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81
PM		 1876err2:
1877 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1878err1:
8a548868 1879 kfree(h323_buffer);
f587de0e
PM		 1880 return ret;
1881}
1882
1883/****************************************************************************/
1884module_init(nf_conntrack_h323_init);
1885module_exit(nf_conntrack_h323_fini);
1886
1887EXPORT_SYMBOL_GPL(get_h225_addr);
1888EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1889EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1890EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1891EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1892EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1893EXPORT_SYMBOL_GPL(nat_t120_hook);
1894EXPORT_SYMBOL_GPL(nat_h245_hook);
1895EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1896EXPORT_SYMBOL_GPL(nat_q931_hook);
1897
1898MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1899MODULE_DESCRIPTION("H.323 connection tracking helper");
1900MODULE_LICENSE("GPL");
1901MODULE_ALIAS("ip_conntrack_h323");
be3eed2e
PNA		 1902MODULE_ALIAS_NFCT_HELPER("RAS");
1903MODULE_ALIAS_NFCT_HELPER("Q.931");
1904MODULE_ALIAS_NFCT_HELPER("H.245");
Linux kernel - Deliverables
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