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[linux-2.6-block.git] / net / netfilter / nf_conntrack_h323_main.c
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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 */
2c7b5d5d
VA		 731static int callforward_do_filter(struct net *net,
732 const union nf_inet_addr *src,
76108cea
JE		 733 const union nf_inet_addr *dst,
734 u_int8_t family)
f587de0e 735{
1e796fda 736 const struct nf_afinfo *afinfo;
f587de0e
PM		 737 int ret = 0;
738
1841a4c7
PM		 739 /* rcu_read_lock()ed by nf_hook_slow() */
740 afinfo = nf_get_afinfo(family);
741 if (!afinfo)
742 return 0;
743
f587de0e
PM		 744 switch (family) {
745 case AF_INET: {
5a49d0e0 746 struct flowi4 fl1, fl2;
f587de0e
PM		 747 struct rtable *rt1, *rt2;
748
5a49d0e0
DM		 749 memset(&fl1, 0, sizeof(fl1));
750 fl1.daddr = src->ip;
751
752 memset(&fl2, 0, sizeof(fl2));
753 fl2.daddr = dst->ip;
2c7b5d5d 754 if (!afinfo->route(net, (struct dst_entry **)&rt1,
0fae2e77 755 flowi4_to_flowi(&fl1), false)) {
2c7b5d5d 756 if (!afinfo->route(net, (struct dst_entry **)&rt2,
0fae2e77 757 flowi4_to_flowi(&fl2), false)) {
bbb5823c
JA		 758 if (rt_nexthop(rt1, fl1.daddr) ==
759 rt_nexthop(rt2, fl2.daddr) &&
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 }
c0cd1156 768#if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
f587de0e 769 case AF_INET6: {
5a49d0e0 770 struct flowi6 fl1, fl2;
f587de0e
PM		 771 struct rt6_info *rt1, *rt2;
772
5a49d0e0 773 memset(&fl1, 0, sizeof(fl1));
4e3fd7a0 774 fl1.daddr = src->in6;
5a49d0e0
DM		 775
776 memset(&fl2, 0, sizeof(fl2));
4e3fd7a0 777 fl2.daddr = dst->in6;
2c7b5d5d 778 if (!afinfo->route(net, (struct dst_entry **)&rt1,
0fae2e77 779 flowi6_to_flowi(&fl1), false)) {
2c7b5d5d 780 if (!afinfo->route(net, (struct dst_entry **)&rt2,
0fae2e77 781 flowi6_to_flowi(&fl2), false)) {
56e42441
JA		 782 if (ipv6_addr_equal(rt6_nexthop(rt1),
783 rt6_nexthop(rt2)) &&
d8d1f30b 784 rt1->dst.dev == rt2->dst.dev)
f587de0e 785 ret = 1;
d8d1f30b 786 dst_release(&rt2->dst);
f587de0e 787 }
d8d1f30b 788 dst_release(&rt1->dst);
f587de0e
PM		 789 }
790 break;
791 }
792#endif
793 }
794 return ret;
795
796}
797
798/****************************************************************************/
3db05fea 799static int expect_callforwarding(struct sk_buff *skb,
f587de0e
PM		 800 struct nf_conn *ct,
801 enum ip_conntrack_info ctinfo,
051966c0 802 unsigned int protoff,
f587de0e
PM		 803 unsigned char **data, int dataoff,
804 TransportAddress *taddr)
805{
806 int dir = CTINFO2DIR(ctinfo);
807 int ret = 0;
808 __be16 port;
643a2c15 809 union nf_inet_addr addr;
f587de0e 810 struct nf_conntrack_expect *exp;
2c7b5d5d 811 struct net *net = nf_ct_net(ct);
f587de0e
PM		 812 typeof(nat_callforwarding_hook) nat_callforwarding;
813
814 /* Read alternativeAddress */
815 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
816 return 0;
817
818 /* If the calling party is on the same side of the forward-to party,
819 * we don't need to track the second call */
820 if (callforward_filter &&
2c7b5d5d 821 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
5e8fbe2a 822 nf_ct_l3num(ct))) {
0d53778e 823 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
f587de0e
PM		 824 return 0;
825 }
826
827 /* Create expect for the second call leg */
6823645d 828 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 829 return -1;
5e8fbe2a 830 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 831 &ct->tuplehash[!dir].tuple.src.u3, &addr,
832 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 833 exp->helper = nf_conntrack_helper_q931;
834
835 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
836 &ct->tuplehash[!dir].tuple.dst.u3,
837 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
838 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
811927cc 839 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 840 ct->status & IPS_NAT_MASK) {
841 /* Need NAT */
051966c0
PM		 842 ret = nat_callforwarding(skb, ct, ctinfo,
843 protoff, data, dataoff,
f587de0e
PM		 844 taddr, port, exp);
845 } else { /* Conntrack only */
6823645d 846 if (nf_ct_expect_related(exp) == 0) {
0d53778e 847 pr_debug("nf_ct_q931: expect Call Forwarding ");
3c9fba65 848 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 849 } else
850 ret = -1;
851 }
852
6823645d 853 nf_ct_expect_put(exp);
f587de0e
PM		 854
855 return ret;
856}
857
858/****************************************************************************/
3db05fea 859static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 860 enum ip_conntrack_info ctinfo,
051966c0 861 unsigned int protoff,
f587de0e
PM		 862 unsigned char **data, int dataoff,
863 Setup_UUIE *setup)
864{
865 int dir = CTINFO2DIR(ctinfo);
866 int ret;
867 int i;
868 __be16 port;
643a2c15 869 union nf_inet_addr addr;
f587de0e
PM		 870 typeof(set_h225_addr_hook) set_h225_addr;
871
0d53778e 872 pr_debug("nf_ct_q931: Setup\n");
f587de0e
PM		 873
874 if (setup->options & eSetup_UUIE_h245Address) {
051966c0 875 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 876 &setup->h245Address);
877 if (ret < 0)
878 return -1;
879 }
880
881 set_h225_addr = rcu_dereference(set_h225_addr_hook);
882 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
811927cc
PM		 883 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
884 ct->status & IPS_NAT_MASK &&
f587de0e 885 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
601e68e1 886 &addr, &port) &&
f587de0e 887 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
5b095d98 888 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 889 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
0d53778e 890 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
051966c0 891 ret = set_h225_addr(skb, protoff, data, dataoff,
f587de0e
PM		 892 &setup->destCallSignalAddress,
893 &ct->tuplehash[!dir].tuple.src.u3,
894 ct->tuplehash[!dir].tuple.src.u.tcp.port);
895 if (ret < 0)
896 return -1;
897 }
898
899 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
811927cc
PM		 900 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
901 ct->status & IPS_NAT_MASK &&
f587de0e 902 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
601e68e1 903 &addr, &port) &&
f587de0e 904 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
5b095d98 905 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
38ff4fa4 906 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
0d53778e 907 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
051966c0 908 ret = set_h225_addr(skb, protoff, data, dataoff,
f587de0e
PM		 909 &setup->sourceCallSignalAddress,
910 &ct->tuplehash[!dir].tuple.dst.u3,
911 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
912 if (ret < 0)
913 return -1;
914 }
915
916 if (setup->options & eSetup_UUIE_fastStart) {
917 for (i = 0; i < setup->fastStart.count; i++) {
051966c0
PM		 918 ret = process_olc(skb, ct, ctinfo,
919 protoff, data, dataoff,
f587de0e
PM		 920 &setup->fastStart.item[i]);
921 if (ret < 0)
922 return -1;
923 }
924 }
925
926 return 0;
927}
928
929/****************************************************************************/
3db05fea 930static int process_callproceeding(struct sk_buff *skb,
f587de0e
PM		 931 struct nf_conn *ct,
932 enum ip_conntrack_info ctinfo,
051966c0 933 unsigned int protoff,
f587de0e
PM		 934 unsigned char **data, int dataoff,
935 CallProceeding_UUIE *callproc)
936{
937 int ret;
938 int i;
939
0d53778e 940 pr_debug("nf_ct_q931: CallProceeding\n");
f587de0e
PM		 941
942 if (callproc->options & eCallProceeding_UUIE_h245Address) {
051966c0 943 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 944 &callproc->h245Address);
945 if (ret < 0)
946 return -1;
947 }
948
949 if (callproc->options & eCallProceeding_UUIE_fastStart) {
950 for (i = 0; i < callproc->fastStart.count; i++) {
051966c0
PM		 951 ret = process_olc(skb, ct, ctinfo,
952 protoff, data, dataoff,
f587de0e
PM		 953 &callproc->fastStart.item[i]);
954 if (ret < 0)
955 return -1;
956 }
957 }
958
959 return 0;
960}
961
962/****************************************************************************/
3db05fea 963static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 964 enum ip_conntrack_info ctinfo,
051966c0 965 unsigned int protoff,
f587de0e
PM		 966 unsigned char **data, int dataoff,
967 Connect_UUIE *connect)
968{
969 int ret;
970 int i;
971
0d53778e 972 pr_debug("nf_ct_q931: Connect\n");
f587de0e
PM		 973
974 if (connect->options & eConnect_UUIE_h245Address) {
051966c0 975 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 976 &connect->h245Address);
977 if (ret < 0)
978 return -1;
979 }
980
981 if (connect->options & eConnect_UUIE_fastStart) {
982 for (i = 0; i < connect->fastStart.count; i++) {
051966c0
PM		 983 ret = process_olc(skb, ct, ctinfo,
984 protoff, data, dataoff,
f587de0e
PM		 985 &connect->fastStart.item[i]);
986 if (ret < 0)
987 return -1;
988 }
989 }
990
991 return 0;
992}
993
994/****************************************************************************/
3db05fea 995static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 996 enum ip_conntrack_info ctinfo,
051966c0 997 unsigned int protoff,
f587de0e
PM		 998 unsigned char **data, int dataoff,
999 Alerting_UUIE *alert)
1000{
1001 int ret;
1002 int i;
1003
0d53778e 1004 pr_debug("nf_ct_q931: Alerting\n");
f587de0e
PM		 1005
1006 if (alert->options & eAlerting_UUIE_h245Address) {
051966c0 1007 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1008 &alert->h245Address);
1009 if (ret < 0)
1010 return -1;
1011 }
1012
1013 if (alert->options & eAlerting_UUIE_fastStart) {
1014 for (i = 0; i < alert->fastStart.count; i++) {
051966c0
PM		 1015 ret = process_olc(skb, ct, ctinfo,
1016 protoff, data, dataoff,
f587de0e
PM		 1017 &alert->fastStart.item[i]);
1018 if (ret < 0)
1019 return -1;
1020 }
1021 }
1022
1023 return 0;
1024}
1025
f587de0e 1026/****************************************************************************/
3db05fea 1027static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1028 enum ip_conntrack_info ctinfo,
051966c0 1029 unsigned int protoff,
f587de0e
PM		 1030 unsigned char **data, int dataoff,
1031 Facility_UUIE *facility)
1032{
1033 int ret;
1034 int i;
1035
0d53778e 1036 pr_debug("nf_ct_q931: Facility\n");
f587de0e
PM		 1037
1038 if (facility->reason.choice == eFacilityReason_callForwarded) {
1039 if (facility->options & eFacility_UUIE_alternativeAddress)
051966c0
PM		 1040 return expect_callforwarding(skb, ct, ctinfo,
1041 protoff, data, dataoff,
f587de0e
PM		 1042 &facility->
1043 alternativeAddress);
1044 return 0;
1045 }
1046
1047 if (facility->options & eFacility_UUIE_h245Address) {
051966c0 1048 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1049 &facility->h245Address);
1050 if (ret < 0)
1051 return -1;
1052 }
1053
1054 if (facility->options & eFacility_UUIE_fastStart) {
1055 for (i = 0; i < facility->fastStart.count; i++) {
051966c0
PM		 1056 ret = process_olc(skb, ct, ctinfo,
1057 protoff, data, dataoff,
f587de0e
PM		 1058 &facility->fastStart.item[i]);
1059 if (ret < 0)
1060 return -1;
1061 }
1062 }
1063
1064 return 0;
1065}
1066
1067/****************************************************************************/
3db05fea 1068static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1069 enum ip_conntrack_info ctinfo,
051966c0 1070 unsigned int protoff,
f587de0e
PM		 1071 unsigned char **data, int dataoff,
1072 Progress_UUIE *progress)
1073{
1074 int ret;
1075 int i;
1076
0d53778e 1077 pr_debug("nf_ct_q931: Progress\n");
f587de0e
PM		 1078
1079 if (progress->options & eProgress_UUIE_h245Address) {
051966c0 1080 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1081 &progress->h245Address);
1082 if (ret < 0)
1083 return -1;
1084 }
1085
1086 if (progress->options & eProgress_UUIE_fastStart) {
1087 for (i = 0; i < progress->fastStart.count; i++) {
051966c0
PM		 1088 ret = process_olc(skb, ct, ctinfo,
1089 protoff, data, dataoff,
f587de0e
PM		 1090 &progress->fastStart.item[i]);
1091 if (ret < 0)
1092 return -1;
1093 }
1094 }
1095
1096 return 0;
1097}
1098
1099/****************************************************************************/
3db05fea 1100static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1101 enum ip_conntrack_info ctinfo,
051966c0
PM		 1102 unsigned int protoff, unsigned char **data, int dataoff,
1103 Q931 *q931)
f587de0e
PM		 1104{
1105 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1106 int i;
1107 int ret = 0;
1108
1109 switch (pdu->h323_message_body.choice) {
1110 case eH323_UU_PDU_h323_message_body_setup:
051966c0 1111 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1112 &pdu->h323_message_body.setup);
1113 break;
1114 case eH323_UU_PDU_h323_message_body_callProceeding:
051966c0
PM		 1115 ret = process_callproceeding(skb, ct, ctinfo,
1116 protoff, data, dataoff,
f587de0e
PM		 1117 &pdu->h323_message_body.
1118 callProceeding);
1119 break;
1120 case eH323_UU_PDU_h323_message_body_connect:
051966c0 1121 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1122 &pdu->h323_message_body.connect);
1123 break;
1124 case eH323_UU_PDU_h323_message_body_alerting:
051966c0 1125 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1126 &pdu->h323_message_body.alerting);
1127 break;
f587de0e 1128 case eH323_UU_PDU_h323_message_body_facility:
051966c0 1129 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1130 &pdu->h323_message_body.facility);
1131 break;
1132 case eH323_UU_PDU_h323_message_body_progress:
051966c0 1133 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
f587de0e
PM		 1134 &pdu->h323_message_body.progress);
1135 break;
1136 default:
0d53778e
PM		 1137 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1138 pdu->h323_message_body.choice);
f587de0e
PM		 1139 break;
1140 }
1141
1142 if (ret < 0)
1143 return -1;
1144
1145 if (pdu->options & eH323_UU_PDU_h245Control) {
1146 for (i = 0; i < pdu->h245Control.count; i++) {
051966c0
PM		 1147 ret = process_h245(skb, ct, ctinfo,
1148 protoff, data, dataoff,
f587de0e
PM		 1149 &pdu->h245Control.item[i]);
1150 if (ret < 0)
1151 return -1;
1152 }
1153 }
1154
1155 return 0;
1156}
1157
1158/****************************************************************************/
3db05fea 1159static int q931_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1160 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1161{
1162 static Q931 q931;
1163 unsigned char *data = NULL;
1164 int datalen;
1165 int dataoff;
1166 int ret;
1167
1168 /* Until there's been traffic both ways, don't look in packets. */
fb048833 1169 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
f587de0e 1170 return NF_ACCEPT;
fb048833 1171
3db05fea 1172 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
f587de0e
PM		 1173
1174 spin_lock_bh(&nf_h323_lock);
1175
1176 /* Process each TPKT */
3db05fea 1177 while (get_tpkt_data(skb, protoff, ct, ctinfo,
f587de0e 1178 &data, &datalen, &dataoff)) {
0d53778e 1179 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
3c9fba65 1180 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1181
1182 /* Decode Q.931 signal */
1183 ret = DecodeQ931(data, datalen, &q931);
1184 if (ret < 0) {
0d53778e
PM		 1185 pr_debug("nf_ct_q931: decoding error: %s\n",
1186 ret == H323_ERROR_BOUND ?
1187 "out of bound" : "out of range");
f587de0e
PM		 1188 /* We don't drop when decoding error */
1189 break;
1190 }
1191
1192 /* Process Q.931 signal */
051966c0
PM		 1193 if (process_q931(skb, ct, ctinfo, protoff,
1194 &data, dataoff, &q931) < 0)
f587de0e
PM		 1195 goto drop;
1196 }
1197
1198 spin_unlock_bh(&nf_h323_lock);
1199 return NF_ACCEPT;
1200
1201 drop:
1202 spin_unlock_bh(&nf_h323_lock);
b20ab9cc 1203 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
f587de0e
PM		 1204 return NF_DROP;
1205}
1206
1207/****************************************************************************/
6002f266
PM		 1208static const struct nf_conntrack_expect_policy q931_exp_policy = {
1209 /* T.120 and H.245 */
1210 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1211 .timeout = 240,
1212};
1213
f587de0e
PM		 1214static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1215 {
1216 .name = "Q.931",
1217 .me = THIS_MODULE,
1afc5679 1218 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1219 .tuple.src.l3num = AF_INET,
09640e63 1220 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1221 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1222 .help = q931_help,
1223 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1224 },
1225 {
1226 .name = "Q.931",
1227 .me = THIS_MODULE,
f587de0e 1228 .tuple.src.l3num = AF_INET6,
09640e63 1229 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
f587de0e 1230 .tuple.dst.protonum = IPPROTO_TCP,
6002f266
PM		 1231 .help = q931_help,
1232 .expect_policy = &q931_exp_policy,
f587de0e
PM		 1233 },
1234};
1235
1236/****************************************************************************/
3db05fea 1237static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1238 int *datalen)
1239{
905e3e8e
JE		 1240 const struct udphdr *uh;
1241 struct udphdr _uh;
f587de0e
PM		 1242 int dataoff;
1243
3db05fea 1244 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
f587de0e
PM		 1245 if (uh == NULL)
1246 return NULL;
1247 dataoff = protoff + sizeof(_uh);
3db05fea 1248 if (dataoff >= skb->len)
f587de0e 1249 return NULL;
3db05fea
HX		 1250 *datalen = skb->len - dataoff;
1251 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
f587de0e
PM		 1252}
1253
1254/****************************************************************************/
1255static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
643a2c15 1256 union nf_inet_addr *addr,
f587de0e
PM		 1257 __be16 port)
1258{
84541cc1 1259 struct net *net = nf_ct_net(ct);
f587de0e
PM		 1260 struct nf_conntrack_expect *exp;
1261 struct nf_conntrack_tuple tuple;
1262
1263 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1264 tuple.src.u.tcp.port = 0;
1265 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1266 tuple.dst.u.tcp.port = port;
1267 tuple.dst.protonum = IPPROTO_TCP;
1268
5d0aa2cc 1269 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
f587de0e
PM		 1270 if (exp && exp->master == ct)
1271 return exp;
1272 return NULL;
1273}
1274
1275/****************************************************************************/
1276static int set_expect_timeout(struct nf_conntrack_expect *exp,
95c96174 1277 unsigned int timeout)
f587de0e
PM		 1278{
1279 if (!exp || !del_timer(&exp->timeout))
1280 return 0;
1281
1282 exp->timeout.expires = jiffies + timeout * HZ;
1283 add_timer(&exp->timeout);
1284
1285 return 1;
1286}
1287
1288/****************************************************************************/
3db05fea 1289static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1290 enum ip_conntrack_info ctinfo,
051966c0 1291 unsigned int protoff, unsigned char **data,
f587de0e
PM		 1292 TransportAddress *taddr, int count)
1293{
1afc5679 1294 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1295 int dir = CTINFO2DIR(ctinfo);
1296 int ret = 0;
1297 int i;
1298 __be16 port;
643a2c15 1299 union nf_inet_addr addr;
f587de0e
PM		 1300 struct nf_conntrack_expect *exp;
1301 typeof(nat_q931_hook) nat_q931;
1302
1303 /* Look for the first related address */
1304 for (i = 0; i < count; i++) {
1305 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1306 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
601e68e1 1307 sizeof(addr)) == 0 && port != 0)
f587de0e
PM		 1308 break;
1309 }
1310
1311 if (i >= count) /* Not found */
1312 return 0;
1313
1314 /* Create expect for Q.931 */
6823645d 1315 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1316 return -1;
5e8fbe2a 1317 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1318 gkrouted_only ? /* only accept calls from GK? */
1319 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1320 &ct->tuplehash[!dir].tuple.dst.u3,
1321 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1322 exp->helper = nf_conntrack_helper_q931;
1323 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1324
1325 nat_q931 = rcu_dereference(nat_q931_hook);
811927cc
PM		 1326 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1327 ct->status & IPS_NAT_MASK) { /* Need NAT */
051966c0
PM		 1328 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1329 taddr, i, port, exp);
f587de0e 1330 } else { /* Conntrack only */
6823645d 1331 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1332 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1333 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1334
1335 /* Save port for looking up expect in processing RCF */
1336 info->sig_port[dir] = port;
1337 } else
1338 ret = -1;
1339 }
1340
6823645d 1341 nf_ct_expect_put(exp);
f587de0e
PM		 1342
1343 return ret;
1344}
1345
1346/****************************************************************************/
3db05fea 1347static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1348 enum ip_conntrack_info ctinfo,
051966c0 1349 unsigned int protoff,
f587de0e
PM		 1350 unsigned char **data, GatekeeperRequest *grq)
1351{
1352 typeof(set_ras_addr_hook) set_ras_addr;
1353
0d53778e 1354 pr_debug("nf_ct_ras: GRQ\n");
f587de0e
PM		 1355
1356 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1357 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1358 ct->status & IPS_NAT_MASK) /* NATed */
051966c0 1359 return set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1360 &grq->rasAddress, 1);
1361 return 0;
1362}
1363
1364/****************************************************************************/
3db05fea 1365static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1366 enum ip_conntrack_info ctinfo,
051966c0 1367 unsigned int protoff,
f587de0e
PM		 1368 unsigned char **data, GatekeeperConfirm *gcf)
1369{
1370 int dir = CTINFO2DIR(ctinfo);
1371 int ret = 0;
1372 __be16 port;
643a2c15 1373 union nf_inet_addr addr;
f587de0e
PM		 1374 struct nf_conntrack_expect *exp;
1375
0d53778e 1376 pr_debug("nf_ct_ras: GCF\n");
f587de0e
PM		 1377
1378 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1379 return 0;
1380
1381 /* Registration port is the same as discovery port */
1382 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1383 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1384 return 0;
1385
1386 /* Avoid RAS expectation loops. A GCF is never expected. */
1387 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1388 return 0;
1389
1390 /* Need new expect */
6823645d 1391 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1392 return -1;
5e8fbe2a 1393 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1394 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1395 IPPROTO_UDP, NULL, &port);
f587de0e
PM		 1396 exp->helper = nf_conntrack_helper_ras;
1397
6823645d 1398 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1399 pr_debug("nf_ct_ras: expect RAS ");
3c9fba65 1400 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1401 } else
1402 ret = -1;
1403
6823645d 1404 nf_ct_expect_put(exp);
f587de0e
PM		 1405
1406 return ret;
1407}
1408
1409/****************************************************************************/
3db05fea 1410static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1411 enum ip_conntrack_info ctinfo,
051966c0 1412 unsigned int protoff,
f587de0e
PM		 1413 unsigned char **data, RegistrationRequest *rrq)
1414{
1afc5679 1415 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1416 int ret;
1417 typeof(set_ras_addr_hook) set_ras_addr;
1418
0d53778e 1419 pr_debug("nf_ct_ras: RRQ\n");
f587de0e 1420
051966c0 1421 ret = expect_q931(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1422 rrq->callSignalAddress.item,
1423 rrq->callSignalAddress.count);
1424 if (ret < 0)
1425 return -1;
1426
1427 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1428 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1429 ct->status & IPS_NAT_MASK) {
051966c0 1430 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1431 rrq->rasAddress.item,
1432 rrq->rasAddress.count);
1433 if (ret < 0)
1434 return -1;
1435 }
1436
1437 if (rrq->options & eRegistrationRequest_timeToLive) {
0d53778e 1438 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
f587de0e
PM		 1439 info->timeout = rrq->timeToLive;
1440 } else
1441 info->timeout = default_rrq_ttl;
1442
1443 return 0;
1444}
1445
1446/****************************************************************************/
3db05fea 1447static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1448 enum ip_conntrack_info ctinfo,
051966c0 1449 unsigned int protoff,
f587de0e
PM		 1450 unsigned char **data, RegistrationConfirm *rcf)
1451{
1afc5679 1452 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1453 int dir = CTINFO2DIR(ctinfo);
1454 int ret;
1455 struct nf_conntrack_expect *exp;
1456 typeof(set_sig_addr_hook) set_sig_addr;
1457
0d53778e 1458 pr_debug("nf_ct_ras: RCF\n");
f587de0e
PM		 1459
1460 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1461 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1462 ct->status & IPS_NAT_MASK) {
051966c0 1463 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1464 rcf->callSignalAddress.item,
1465 rcf->callSignalAddress.count);
1466 if (ret < 0)
1467 return -1;
1468 }
1469
1470 if (rcf->options & eRegistrationConfirm_timeToLive) {
0d53778e 1471 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
f587de0e
PM		 1472 info->timeout = rcf->timeToLive;
1473 }
1474
1475 if (info->timeout > 0) {
0d53778e
PM		 1476 pr_debug("nf_ct_ras: set RAS connection timeout to "
1477 "%u seconds\n", info->timeout);
3db05fea 1478 nf_ct_refresh(ct, skb, info->timeout * HZ);
f587de0e
PM		 1479
1480 /* Set expect timeout */
ca7433df 1481 spin_lock_bh(&nf_conntrack_expect_lock);
f587de0e
PM		 1482 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1483 info->sig_port[!dir]);
1484 if (exp) {
0d53778e
PM		 1485 pr_debug("nf_ct_ras: set Q.931 expect "
1486 "timeout to %u seconds for",
1487 info->timeout);
3c9fba65 1488 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1489 set_expect_timeout(exp, info->timeout);
1490 }
ca7433df 1491 spin_unlock_bh(&nf_conntrack_expect_lock);
f587de0e
PM		 1492 }
1493
1494 return 0;
1495}
1496
1497/****************************************************************************/
3db05fea 1498static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1499 enum ip_conntrack_info ctinfo,
051966c0 1500 unsigned int protoff,
f587de0e
PM		 1501 unsigned char **data, UnregistrationRequest *urq)
1502{
1afc5679 1503 struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1504 int dir = CTINFO2DIR(ctinfo);
1505 int ret;
1506 typeof(set_sig_addr_hook) set_sig_addr;
1507
0d53778e 1508 pr_debug("nf_ct_ras: URQ\n");
f587de0e
PM		 1509
1510 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1511 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1512 ct->status & IPS_NAT_MASK) {
051966c0 1513 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1514 urq->callSignalAddress.item,
1515 urq->callSignalAddress.count);
1516 if (ret < 0)
1517 return -1;
1518 }
1519
1520 /* Clear old expect */
1521 nf_ct_remove_expectations(ct);
1522 info->sig_port[dir] = 0;
1523 info->sig_port[!dir] = 0;
1524
1525 /* Give it 30 seconds for UCF or URJ */
3db05fea 1526 nf_ct_refresh(ct, skb, 30 * HZ);
f587de0e
PM		 1527
1528 return 0;
1529}
1530
1531/****************************************************************************/
3db05fea 1532static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1533 enum ip_conntrack_info ctinfo,
051966c0 1534 unsigned int protoff,
f587de0e
PM		 1535 unsigned char **data, AdmissionRequest *arq)
1536{
1afc5679 1537 const struct nf_ct_h323_master *info = nfct_help_data(ct);
f587de0e
PM		 1538 int dir = CTINFO2DIR(ctinfo);
1539 __be16 port;
643a2c15 1540 union nf_inet_addr addr;
f587de0e
PM		 1541 typeof(set_h225_addr_hook) set_h225_addr;
1542
0d53778e 1543 pr_debug("nf_ct_ras: ARQ\n");
f587de0e
PM		 1544
1545 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1546 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1547 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
601e68e1 1548 &addr, &port) &&
f587de0e
PM		 1549 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1550 port == info->sig_port[dir] &&
811927cc 1551 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
f587de0e
PM		 1552 set_h225_addr && ct->status & IPS_NAT_MASK) {
1553 /* Answering ARQ */
051966c0 1554 return set_h225_addr(skb, protoff, data, 0,
f587de0e
PM		 1555 &arq->destCallSignalAddress,
1556 &ct->tuplehash[!dir].tuple.dst.u3,
1557 info->sig_port[!dir]);
1558 }
1559
1560 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1561 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
601e68e1 1562 &addr, &port) &&
f587de0e 1563 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
811927cc
PM		 1564 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1565 ct->status & IPS_NAT_MASK) {
f587de0e 1566 /* Calling ARQ */
051966c0 1567 return set_h225_addr(skb, protoff, data, 0,
f587de0e
PM		 1568 &arq->srcCallSignalAddress,
1569 &ct->tuplehash[!dir].tuple.dst.u3,
1570 port);
1571 }
1572
1573 return 0;
1574}
1575
1576/****************************************************************************/
3db05fea 1577static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1578 enum ip_conntrack_info ctinfo,
051966c0 1579 unsigned int protoff,
f587de0e
PM		 1580 unsigned char **data, AdmissionConfirm *acf)
1581{
1582 int dir = CTINFO2DIR(ctinfo);
1583 int ret = 0;
1584 __be16 port;
643a2c15 1585 union nf_inet_addr addr;
f587de0e
PM		 1586 struct nf_conntrack_expect *exp;
1587 typeof(set_sig_addr_hook) set_sig_addr;
1588
0d53778e 1589 pr_debug("nf_ct_ras: ACF\n");
f587de0e
PM		 1590
1591 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1592 &addr, &port))
1593 return 0;
1594
1595 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1596 /* Answering ACF */
1597 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1598 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1599 ct->status & IPS_NAT_MASK)
051966c0 1600 return set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1601 &acf->destCallSignalAddress, 1);
1602 return 0;
1603 }
1604
1605 /* Need new expect */
6823645d 1606 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1607 return -1;
5e8fbe2a 1608 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1609 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1610 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1611 exp->flags = NF_CT_EXPECT_PERMANENT;
1612 exp->helper = nf_conntrack_helper_q931;
1613
6823645d 1614 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1615 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1616 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1617 } else
1618 ret = -1;
1619
6823645d 1620 nf_ct_expect_put(exp);
f587de0e
PM		 1621
1622 return ret;
1623}
1624
1625/****************************************************************************/
3db05fea 1626static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1627 enum ip_conntrack_info ctinfo,
051966c0 1628 unsigned int protoff,
f587de0e
PM		 1629 unsigned char **data, LocationRequest *lrq)
1630{
1631 typeof(set_ras_addr_hook) set_ras_addr;
1632
0d53778e 1633 pr_debug("nf_ct_ras: LRQ\n");
f587de0e
PM		 1634
1635 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1636 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1637 ct->status & IPS_NAT_MASK)
051966c0 1638 return set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1639 &lrq->replyAddress, 1);
1640 return 0;
1641}
1642
1643/****************************************************************************/
3db05fea 1644static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1645 enum ip_conntrack_info ctinfo,
051966c0 1646 unsigned int protoff,
f587de0e
PM		 1647 unsigned char **data, LocationConfirm *lcf)
1648{
1649 int dir = CTINFO2DIR(ctinfo);
1650 int ret = 0;
1651 __be16 port;
643a2c15 1652 union nf_inet_addr addr;
f587de0e
PM		 1653 struct nf_conntrack_expect *exp;
1654
0d53778e 1655 pr_debug("nf_ct_ras: LCF\n");
f587de0e
PM		 1656
1657 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1658 &addr, &port))
1659 return 0;
1660
1661 /* Need new expect for call signal */
6823645d 1662 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
f587de0e 1663 return -1;
5e8fbe2a 1664 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
6823645d
PM		 1665 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1666 IPPROTO_TCP, NULL, &port);
f587de0e
PM		 1667 exp->flags = NF_CT_EXPECT_PERMANENT;
1668 exp->helper = nf_conntrack_helper_q931;
1669
6823645d 1670 if (nf_ct_expect_related(exp) == 0) {
0d53778e 1671 pr_debug("nf_ct_ras: expect Q.931 ");
3c9fba65 1672 nf_ct_dump_tuple(&exp->tuple);
f587de0e
PM		 1673 } else
1674 ret = -1;
1675
6823645d 1676 nf_ct_expect_put(exp);
f587de0e
PM		 1677
1678 /* Ignore rasAddress */
1679
1680 return ret;
1681}
1682
1683/****************************************************************************/
3db05fea 1684static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1685 enum ip_conntrack_info ctinfo,
051966c0 1686 unsigned int protoff,
f587de0e
PM		 1687 unsigned char **data, InfoRequestResponse *irr)
1688{
1689 int ret;
1690 typeof(set_ras_addr_hook) set_ras_addr;
1691 typeof(set_sig_addr_hook) set_sig_addr;
1692
0d53778e 1693 pr_debug("nf_ct_ras: IRR\n");
f587de0e
PM		 1694
1695 set_ras_addr = rcu_dereference(set_ras_addr_hook);
811927cc
PM		 1696 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1697 ct->status & IPS_NAT_MASK) {
051966c0 1698 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1699 &irr->rasAddress, 1);
1700 if (ret < 0)
1701 return -1;
1702 }
1703
1704 set_sig_addr = rcu_dereference(set_sig_addr_hook);
811927cc
PM		 1705 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1706 ct->status & IPS_NAT_MASK) {
051966c0 1707 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1708 irr->callSignalAddress.item,
1709 irr->callSignalAddress.count);
1710 if (ret < 0)
1711 return -1;
1712 }
1713
1714 return 0;
1715}
1716
1717/****************************************************************************/
3db05fea 1718static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
f587de0e 1719 enum ip_conntrack_info ctinfo,
051966c0 1720 unsigned int protoff,
f587de0e
PM		 1721 unsigned char **data, RasMessage *ras)
1722{
1723 switch (ras->choice) {
1724 case eRasMessage_gatekeeperRequest:
051966c0 1725 return process_grq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1726 &ras->gatekeeperRequest);
1727 case eRasMessage_gatekeeperConfirm:
051966c0 1728 return process_gcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1729 &ras->gatekeeperConfirm);
1730 case eRasMessage_registrationRequest:
051966c0 1731 return process_rrq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1732 &ras->registrationRequest);
1733 case eRasMessage_registrationConfirm:
051966c0 1734 return process_rcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1735 &ras->registrationConfirm);
1736 case eRasMessage_unregistrationRequest:
051966c0 1737 return process_urq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1738 &ras->unregistrationRequest);
1739 case eRasMessage_admissionRequest:
051966c0 1740 return process_arq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1741 &ras->admissionRequest);
1742 case eRasMessage_admissionConfirm:
051966c0 1743 return process_acf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1744 &ras->admissionConfirm);
1745 case eRasMessage_locationRequest:
051966c0 1746 return process_lrq(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1747 &ras->locationRequest);
1748 case eRasMessage_locationConfirm:
051966c0 1749 return process_lcf(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1750 &ras->locationConfirm);
1751 case eRasMessage_infoRequestResponse:
051966c0 1752 return process_irr(skb, ct, ctinfo, protoff, data,
f587de0e
PM		 1753 &ras->infoRequestResponse);
1754 default:
0d53778e 1755 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
f587de0e
PM		 1756 break;
1757 }
1758
1759 return 0;
1760}
1761
1762/****************************************************************************/
3db05fea 1763static int ras_help(struct sk_buff *skb, unsigned int protoff,
f587de0e
PM		 1764 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1765{
1766 static RasMessage ras;
1767 unsigned char *data;
1768 int datalen = 0;
1769 int ret;
1770
3db05fea 1771 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
f587de0e
PM		 1772
1773 spin_lock_bh(&nf_h323_lock);
1774
1775 /* Get UDP data */
3db05fea 1776 data = get_udp_data(skb, protoff, &datalen);
f587de0e
PM		 1777 if (data == NULL)
1778 goto accept;
0d53778e 1779 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
3c9fba65 1780 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
f587de0e
PM		 1781
1782 /* Decode RAS message */
1783 ret = DecodeRasMessage(data, datalen, &ras);
1784 if (ret < 0) {
0d53778e
PM		 1785 pr_debug("nf_ct_ras: decoding error: %s\n",
1786 ret == H323_ERROR_BOUND ?
1787 "out of bound" : "out of range");
f587de0e
PM		 1788 goto accept;
1789 }
1790
1791 /* Process RAS message */
051966c0 1792 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
f587de0e
PM		 1793 goto drop;
1794
1795 accept:
1796 spin_unlock_bh(&nf_h323_lock);
1797 return NF_ACCEPT;
1798
1799 drop:
1800 spin_unlock_bh(&nf_h323_lock);
b20ab9cc 1801 nf_ct_helper_log(skb, ct, "cannot process RAS message");
f587de0e
PM		 1802 return NF_DROP;
1803}
1804
1805/****************************************************************************/
6002f266
PM		 1806static const struct nf_conntrack_expect_policy ras_exp_policy = {
1807 .max_expected = 32,
1808 .timeout = 240,
1809};
1810
f587de0e
PM		 1811static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1812 {
1813 .name = "RAS",
1814 .me = THIS_MODULE,
1afc5679 1815 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1816 .tuple.src.l3num = AF_INET,
09640e63 1817 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1818 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1819 .help = ras_help,
6002f266 1820 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1821 },
1822 {
1823 .name = "RAS",
1824 .me = THIS_MODULE,
1afc5679 1825 .data_len = sizeof(struct nf_ct_h323_master),
f587de0e 1826 .tuple.src.l3num = AF_INET6,
09640e63 1827 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
f587de0e 1828 .tuple.dst.protonum = IPPROTO_UDP,
f587de0e 1829 .help = ras_help,
6002f266 1830 .expect_policy = &ras_exp_policy,
f587de0e
PM		 1831 },
1832};
1833
1834/****************************************************************************/
1835static void __exit nf_conntrack_h323_fini(void)
1836{
1837 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1838 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1839 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1840 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81 1841 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1842 kfree(h323_buffer);
0d53778e 1843 pr_debug("nf_ct_h323: fini\n");
f587de0e
PM		 1844}
1845
1846/****************************************************************************/
1847static int __init nf_conntrack_h323_init(void)
1848{
1849 int ret;
1850
1851 h323_buffer = kmalloc(65536, GFP_KERNEL);
1852 if (!h323_buffer)
1853 return -ENOMEM;
a56b8f81 1854 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
f587de0e
PM		 1855 if (ret < 0)
1856 goto err1;
a56b8f81 1857 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
f587de0e
PM		 1858 if (ret < 0)
1859 goto err2;
a56b8f81 1860 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
f587de0e
PM		 1861 if (ret < 0)
1862 goto err3;
a56b8f81 1863 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
f587de0e
PM		 1864 if (ret < 0)
1865 goto err4;
a56b8f81
PM		 1866 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1867 if (ret < 0)
1868 goto err5;
0d53778e 1869 pr_debug("nf_ct_h323: init success\n");
f587de0e
PM		 1870 return 0;
1871
a56b8f81 1872err5:
f587de0e 1873 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
a56b8f81 1874err4:
f587de0e 1875 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
a56b8f81 1876err3:
f587de0e 1877 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
a56b8f81
PM		 1878err2:
1879 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
f587de0e 1880err1:
8a548868 1881 kfree(h323_buffer);
f587de0e
PM		 1882 return ret;
1883}
1884
1885/****************************************************************************/
1886module_init(nf_conntrack_h323_init);
1887module_exit(nf_conntrack_h323_fini);
1888
1889EXPORT_SYMBOL_GPL(get_h225_addr);
1890EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1891EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1892EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1893EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1894EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1895EXPORT_SYMBOL_GPL(nat_t120_hook);
1896EXPORT_SYMBOL_GPL(nat_h245_hook);
1897EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1898EXPORT_SYMBOL_GPL(nat_q931_hook);
1899
1900MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1901MODULE_DESCRIPTION("H.323 connection tracking helper");
1902MODULE_LICENSE("GPL");
1903MODULE_ALIAS("ip_conntrack_h323");
be3eed2e
PNA		 1904MODULE_ALIAS_NFCT_HELPER("RAS");
1905MODULE_ALIAS_NFCT_HELPER("Q.931");
1906MODULE_ALIAS_NFCT_HELPER("H.245");
Linux 6.x block layer and io_uring tree(s)