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1 /*
2 * H.323 connection tracking helper
3 *
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
5 * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
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>
21 #include <linux/slab.h>
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>
34 #include <net/netfilter/nf_conntrack_zones.h>
35 #include <linux/netfilter/nf_conntrack_h323.h>
36
37 /* Parameters */
38 static unsigned int default_rrq_ttl __read_mostly = 300;
39 module_param(default_rrq_ttl, uint, 0600);
40 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
41
42 static int gkrouted_only __read_mostly = 1;
43 module_param(gkrouted_only, int, 0600);
44 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
45
46 static bool callforward_filter __read_mostly = true;
47 module_param(callforward_filter, bool, 0600);
48 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
49 "if both endpoints are on different sides "
50 "(determined by routing information)");
51
52 /* Hooks for NAT */
53 int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
54 unsigned char **data, int dataoff,
55 H245_TransportAddress *taddr,
56 union nf_inet_addr *addr, __be16 port)
57 __read_mostly;
58 int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
59 unsigned char **data, int dataoff,
60 TransportAddress *taddr,
61 union nf_inet_addr *addr, __be16 port)
62 __read_mostly;
63 int (*set_sig_addr_hook) (struct sk_buff *skb,
64 struct nf_conn *ct,
65 enum ip_conntrack_info ctinfo,
66 unsigned int protoff, unsigned char **data,
67 TransportAddress *taddr, int count) __read_mostly;
68 int (*set_ras_addr_hook) (struct sk_buff *skb,
69 struct nf_conn *ct,
70 enum ip_conntrack_info ctinfo,
71 unsigned int protoff, unsigned char **data,
72 TransportAddress *taddr, int count) __read_mostly;
73 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
74 struct nf_conn *ct,
75 enum ip_conntrack_info ctinfo,
76 unsigned int protoff,
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;
82 int (*nat_t120_hook) (struct sk_buff *skb,
83 struct nf_conn *ct,
84 enum ip_conntrack_info ctinfo,
85 unsigned int protoff,
86 unsigned char **data, int dataoff,
87 H245_TransportAddress *taddr, __be16 port,
88 struct nf_conntrack_expect *exp) __read_mostly;
89 int (*nat_h245_hook) (struct sk_buff *skb,
90 struct nf_conn *ct,
91 enum ip_conntrack_info ctinfo,
92 unsigned int protoff,
93 unsigned char **data, int dataoff,
94 TransportAddress *taddr, __be16 port,
95 struct nf_conntrack_expect *exp) __read_mostly;
96 int (*nat_callforwarding_hook) (struct sk_buff *skb,
97 struct nf_conn *ct,
98 enum ip_conntrack_info ctinfo,
99 unsigned int protoff,
100 unsigned char **data, int dataoff,
101 TransportAddress *taddr, __be16 port,
102 struct nf_conntrack_expect *exp) __read_mostly;
103 int (*nat_q931_hook) (struct sk_buff *skb,
104 struct nf_conn *ct,
105 enum ip_conntrack_info ctinfo,
106 unsigned int protoff,
107 unsigned char **data, TransportAddress *taddr, int idx,
108 __be16 port, struct nf_conntrack_expect *exp)
109 __read_mostly;
110
111 static DEFINE_SPINLOCK(nf_h323_lock);
112 static char *h323_buffer;
113
114 static struct nf_conntrack_helper nf_conntrack_helper_h245;
115 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
116 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
117
118 /****************************************************************************/
119 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
120 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
121 unsigned char **data, int *datalen, int *dataoff)
122 {
123 struct nf_ct_h323_master *info = nfct_help_data(ct);
124 int dir = CTINFO2DIR(ctinfo);
125 const struct tcphdr *th;
126 struct tcphdr _tcph;
127 int tcpdatalen;
128 int tcpdataoff;
129 unsigned char *tpkt;
130 int tpktlen;
131 int tpktoff;
132
133 /* Get TCP header */
134 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
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 */
142 tcpdatalen = skb->len - tcpdataoff;
143 if (tcpdatalen <= 0) /* No TCP data */
144 goto clear_out;
145
146 if (*data == NULL) { /* first TPKT */
147 /* Get first TPKT pointer */
148 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
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) {
156 pr_debug("nf_ct_h323: previous packet "
157 "indicated separate TPKT data of %hu "
158 "bytes\n", info->tpkt_len[dir]);
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 */
169 pr_debug("nf_ct_h323: fragmented TPKT\n");
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 */
196 pr_debug("nf_ct_h323: separate TPKT header indicates "
197 "there will be TPKT data of %hu bytes\n",
198 tpktlen - 4);
199 info->tpkt_len[dir] = tpktlen - 4;
200 return 0;
201 }
202
203 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
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 /****************************************************************************/
223 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
224 H245_TransportAddress *taddr,
225 union nf_inet_addr *addr, __be16 *port)
226 {
227 const unsigned char *p;
228 int len;
229
230 if (taddr->choice != eH245_TransportAddress_unicastAddress)
231 return 0;
232
233 switch (taddr->unicastAddress.choice) {
234 case eUnicastAddress_iPAddress:
235 if (nf_ct_l3num(ct) != AF_INET)
236 return 0;
237 p = data + taddr->unicastAddress.iPAddress.network;
238 len = 4;
239 break;
240 case eUnicastAddress_iP6Address:
241 if (nf_ct_l3num(ct) != AF_INET6)
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 /****************************************************************************/
258 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
259 enum ip_conntrack_info ctinfo,
260 unsigned int protoff,
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;
268 union nf_inet_addr addr;
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 */
280 rtp_port = port & ~htons(1);
281 rtcp_port = port | htons(1);
282
283 /* Create expect for RTP */
284 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
285 return -1;
286 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
287 &ct->tuplehash[!dir].tuple.src.u3,
288 &ct->tuplehash[!dir].tuple.dst.u3,
289 IPPROTO_UDP, NULL, &rtp_port);
290
291 /* Create expect for RTCP */
292 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
293 nf_ct_expect_put(rtp_exp);
294 return -1;
295 }
296 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
297 &ct->tuplehash[!dir].tuple.src.u3,
298 &ct->tuplehash[!dir].tuple.dst.u3,
299 IPPROTO_UDP, NULL, &rtcp_port);
300
301 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
302 &ct->tuplehash[!dir].tuple.dst.u3,
303 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
304 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
305 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
306 ct->status & IPS_NAT_MASK) {
307 /* NAT needed */
308 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
309 taddr, port, rtp_port, rtp_exp, rtcp_exp);
310 } else { /* Conntrack only */
311 if (nf_ct_expect_related(rtp_exp) == 0) {
312 if (nf_ct_expect_related(rtcp_exp) == 0) {
313 pr_debug("nf_ct_h323: expect RTP ");
314 nf_ct_dump_tuple(&rtp_exp->tuple);
315 pr_debug("nf_ct_h323: expect RTCP ");
316 nf_ct_dump_tuple(&rtcp_exp->tuple);
317 } else {
318 nf_ct_unexpect_related(rtp_exp);
319 ret = -1;
320 }
321 } else
322 ret = -1;
323 }
324
325 nf_ct_expect_put(rtp_exp);
326 nf_ct_expect_put(rtcp_exp);
327
328 return ret;
329 }
330
331 /****************************************************************************/
332 static int expect_t120(struct sk_buff *skb,
333 struct nf_conn *ct,
334 enum ip_conntrack_info ctinfo,
335 unsigned int protoff,
336 unsigned char **data, int dataoff,
337 H245_TransportAddress *taddr)
338 {
339 int dir = CTINFO2DIR(ctinfo);
340 int ret = 0;
341 __be16 port;
342 union nf_inet_addr addr;
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 */
353 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
354 return -1;
355 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
356 &ct->tuplehash[!dir].tuple.src.u3,
357 &ct->tuplehash[!dir].tuple.dst.u3,
358 IPPROTO_TCP, NULL, &port);
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)) &&
365 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
366 ct->status & IPS_NAT_MASK) {
367 /* NAT needed */
368 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
369 port, exp);
370 } else { /* Conntrack only */
371 if (nf_ct_expect_related(exp) == 0) {
372 pr_debug("nf_ct_h323: expect T.120 ");
373 nf_ct_dump_tuple(&exp->tuple);
374 } else
375 ret = -1;
376 }
377
378 nf_ct_expect_put(exp);
379
380 return ret;
381 }
382
383 /****************************************************************************/
384 static int process_h245_channel(struct sk_buff *skb,
385 struct nf_conn *ct,
386 enum ip_conntrack_info ctinfo,
387 unsigned int protoff,
388 unsigned char **data, int dataoff,
389 H2250LogicalChannelParameters *channel)
390 {
391 int ret;
392
393 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
394 /* RTP */
395 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
396 &channel->mediaChannel);
397 if (ret < 0)
398 return -1;
399 }
400
401 if (channel->
402 options & eH2250LogicalChannelParameters_mediaControlChannel) {
403 /* RTCP */
404 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
405 &channel->mediaControlChannel);
406 if (ret < 0)
407 return -1;
408 }
409
410 return 0;
411 }
412
413 /****************************************************************************/
414 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
415 enum ip_conntrack_info ctinfo,
416 unsigned int protoff,
417 unsigned char **data, int dataoff,
418 OpenLogicalChannel *olc)
419 {
420 int ret;
421
422 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
423
424 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
425 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
426 {
427 ret = process_h245_channel(skb, ct, ctinfo,
428 protoff, data, dataoff,
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 =
446 process_h245_channel(skb, ct, ctinfo,
447 protoff, data, dataoff,
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) {
465 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
466 &olc->separateStack.networkAddress.
467 localAreaAddress);
468 if (ret < 0)
469 return -1;
470 }
471
472 return 0;
473 }
474
475 /****************************************************************************/
476 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
477 enum ip_conntrack_info ctinfo,
478 unsigned int protoff, unsigned char **data, int dataoff,
479 OpenLogicalChannelAck *olca)
480 {
481 H2250LogicalChannelAckParameters *ack;
482 int ret;
483
484 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
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 {
494 ret = process_h245_channel(skb, ct, ctinfo,
495 protoff, data, dataoff,
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 */
514 ret = expect_rtp_rtcp(skb, ct, ctinfo,
515 protoff, data, dataoff,
516 &ack->mediaChannel);
517 if (ret < 0)
518 return -1;
519 }
520
521 if (ack->options &
522 eH2250LogicalChannelAckParameters_mediaControlChannel) {
523 /* RTCP */
524 ret = expect_rtp_rtcp(skb, ct, ctinfo,
525 protoff, data, dataoff,
526 &ack->mediaControlChannel);
527 if (ret < 0)
528 return -1;
529 }
530 }
531
532 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
533 olca->separateStack.networkAddress.choice ==
534 eNetworkAccessParameters_networkAddress_localAreaAddress) {
535 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
536 &olca->separateStack.networkAddress.
537 localAreaAddress);
538 if (ret < 0)
539 return -1;
540 }
541
542 return 0;
543 }
544
545 /****************************************************************************/
546 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
547 enum ip_conntrack_info ctinfo,
548 unsigned int protoff, unsigned char **data, int dataoff,
549 MultimediaSystemControlMessage *mscm)
550 {
551 switch (mscm->choice) {
552 case eMultimediaSystemControlMessage_request:
553 if (mscm->request.choice ==
554 eRequestMessage_openLogicalChannel) {
555 return process_olc(skb, ct, ctinfo,
556 protoff, data, dataoff,
557 &mscm->request.openLogicalChannel);
558 }
559 pr_debug("nf_ct_h323: H.245 Request %d\n",
560 mscm->request.choice);
561 break;
562 case eMultimediaSystemControlMessage_response:
563 if (mscm->response.choice ==
564 eResponseMessage_openLogicalChannelAck) {
565 return process_olca(skb, ct, ctinfo,
566 protoff, data, dataoff,
567 &mscm->response.
568 openLogicalChannelAck);
569 }
570 pr_debug("nf_ct_h323: H.245 Response %d\n",
571 mscm->response.choice);
572 break;
573 default:
574 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
575 break;
576 }
577
578 return 0;
579 }
580
581 /****************************************************************************/
582 static int h245_help(struct sk_buff *skb, unsigned int protoff,
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. */
592 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
593 return NF_ACCEPT;
594
595 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
596
597 spin_lock_bh(&nf_h323_lock);
598
599 /* Process each TPKT */
600 while (get_tpkt_data(skb, protoff, ct, ctinfo,
601 &data, &datalen, &dataoff)) {
602 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
603 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
604
605 /* Decode H.245 signal */
606 ret = DecodeMultimediaSystemControlMessage(data, datalen,
607 &mscm);
608 if (ret < 0) {
609 pr_debug("nf_ct_h245: decoding error: %s\n",
610 ret == H323_ERROR_BOUND ?
611 "out of bound" : "out of range");
612 /* We don't drop when decoding error */
613 break;
614 }
615
616 /* Process H.245 signal */
617 if (process_h245(skb, ct, ctinfo, protoff,
618 &data, dataoff, &mscm) < 0)
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);
627 nf_ct_helper_log(skb, ct, "cannot process H.245 message");
628 return NF_DROP;
629 }
630
631 /****************************************************************************/
632 static 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
637 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
638 .name = "H.245",
639 .me = THIS_MODULE,
640 .tuple.src.l3num = AF_UNSPEC,
641 .tuple.dst.protonum = IPPROTO_UDP,
642 .help = h245_help,
643 .expect_policy = &h245_exp_policy,
644 };
645
646 /****************************************************************************/
647 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
648 TransportAddress *taddr,
649 union nf_inet_addr *addr, __be16 *port)
650 {
651 const unsigned char *p;
652 int len;
653
654 switch (taddr->choice) {
655 case eTransportAddress_ipAddress:
656 if (nf_ct_l3num(ct) != AF_INET)
657 return 0;
658 p = data + taddr->ipAddress.ip;
659 len = 4;
660 break;
661 case eTransportAddress_ip6Address:
662 if (nf_ct_l3num(ct) != AF_INET6)
663 return 0;
664 p = data + taddr->ip6Address.ip;
665 len = 16;
666 break;
667 default:
668 return 0;
669 }
670
671 memcpy(addr, p, len);
672 memset((void *)addr + len, 0, sizeof(*addr) - len);
673 memcpy(port, p + len, sizeof(__be16));
674
675 return 1;
676 }
677
678 /****************************************************************************/
679 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
680 enum ip_conntrack_info ctinfo,
681 unsigned int protoff, unsigned char **data, int dataoff,
682 TransportAddress *taddr)
683 {
684 int dir = CTINFO2DIR(ctinfo);
685 int ret = 0;
686 __be16 port;
687 union nf_inet_addr addr;
688 struct nf_conntrack_expect *exp;
689 typeof(nat_h245_hook) nat_h245;
690
691 /* Read h245Address */
692 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
693 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
694 port == 0)
695 return 0;
696
697 /* Create expect for h245 connection */
698 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
699 return -1;
700 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
701 &ct->tuplehash[!dir].tuple.src.u3,
702 &ct->tuplehash[!dir].tuple.dst.u3,
703 IPPROTO_TCP, NULL, &port);
704 exp->helper = &nf_conntrack_helper_h245;
705
706 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
707 &ct->tuplehash[!dir].tuple.dst.u3,
708 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
709 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
710 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
711 ct->status & IPS_NAT_MASK) {
712 /* NAT needed */
713 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
714 port, exp);
715 } else { /* Conntrack only */
716 if (nf_ct_expect_related(exp) == 0) {
717 pr_debug("nf_ct_q931: expect H.245 ");
718 nf_ct_dump_tuple(&exp->tuple);
719 } else
720 ret = -1;
721 }
722
723 nf_ct_expect_put(exp);
724
725 return ret;
726 }
727
728 /* If the calling party is on the same side of the forward-to party,
729 * we don't need to track the second call */
730 static int callforward_do_filter(struct net *net,
731 const union nf_inet_addr *src,
732 const union nf_inet_addr *dst,
733 u_int8_t family)
734 {
735 const struct nf_afinfo *afinfo;
736 int ret = 0;
737
738 /* rcu_read_lock()ed by nf_hook_thresh */
739 afinfo = nf_get_afinfo(family);
740 if (!afinfo)
741 return 0;
742
743 switch (family) {
744 case AF_INET: {
745 struct flowi4 fl1, fl2;
746 struct rtable *rt1, *rt2;
747
748 memset(&fl1, 0, sizeof(fl1));
749 fl1.daddr = src->ip;
750
751 memset(&fl2, 0, sizeof(fl2));
752 fl2.daddr = dst->ip;
753 if (!afinfo->route(net, (struct dst_entry **)&rt1,
754 flowi4_to_flowi(&fl1), false)) {
755 if (!afinfo->route(net, (struct dst_entry **)&rt2,
756 flowi4_to_flowi(&fl2), false)) {
757 if (rt_nexthop(rt1, fl1.daddr) ==
758 rt_nexthop(rt2, fl2.daddr) &&
759 rt1->dst.dev == rt2->dst.dev)
760 ret = 1;
761 dst_release(&rt2->dst);
762 }
763 dst_release(&rt1->dst);
764 }
765 break;
766 }
767 #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
768 case AF_INET6: {
769 struct flowi6 fl1, fl2;
770 struct rt6_info *rt1, *rt2;
771
772 memset(&fl1, 0, sizeof(fl1));
773 fl1.daddr = src->in6;
774
775 memset(&fl2, 0, sizeof(fl2));
776 fl2.daddr = dst->in6;
777 if (!afinfo->route(net, (struct dst_entry **)&rt1,
778 flowi6_to_flowi(&fl1), false)) {
779 if (!afinfo->route(net, (struct dst_entry **)&rt2,
780 flowi6_to_flowi(&fl2), false)) {
781 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
782 rt6_nexthop(rt2, &fl2.daddr)) &&
783 rt1->dst.dev == rt2->dst.dev)
784 ret = 1;
785 dst_release(&rt2->dst);
786 }
787 dst_release(&rt1->dst);
788 }
789 break;
790 }
791 #endif
792 }
793 return ret;
794
795 }
796
797 /****************************************************************************/
798 static int expect_callforwarding(struct sk_buff *skb,
799 struct nf_conn *ct,
800 enum ip_conntrack_info ctinfo,
801 unsigned int protoff,
802 unsigned char **data, int dataoff,
803 TransportAddress *taddr)
804 {
805 int dir = CTINFO2DIR(ctinfo);
806 int ret = 0;
807 __be16 port;
808 union nf_inet_addr addr;
809 struct nf_conntrack_expect *exp;
810 struct net *net = nf_ct_net(ct);
811 typeof(nat_callforwarding_hook) nat_callforwarding;
812
813 /* Read alternativeAddress */
814 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
815 return 0;
816
817 /* If the calling party is on the same side of the forward-to party,
818 * we don't need to track the second call */
819 if (callforward_filter &&
820 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
821 nf_ct_l3num(ct))) {
822 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
823 return 0;
824 }
825
826 /* Create expect for the second call leg */
827 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
828 return -1;
829 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
830 &ct->tuplehash[!dir].tuple.src.u3, &addr,
831 IPPROTO_TCP, NULL, &port);
832 exp->helper = nf_conntrack_helper_q931;
833
834 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
835 &ct->tuplehash[!dir].tuple.dst.u3,
836 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
837 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
838 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
839 ct->status & IPS_NAT_MASK) {
840 /* Need NAT */
841 ret = nat_callforwarding(skb, ct, ctinfo,
842 protoff, data, dataoff,
843 taddr, port, exp);
844 } else { /* Conntrack only */
845 if (nf_ct_expect_related(exp) == 0) {
846 pr_debug("nf_ct_q931: expect Call Forwarding ");
847 nf_ct_dump_tuple(&exp->tuple);
848 } else
849 ret = -1;
850 }
851
852 nf_ct_expect_put(exp);
853
854 return ret;
855 }
856
857 /****************************************************************************/
858 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
859 enum ip_conntrack_info ctinfo,
860 unsigned int protoff,
861 unsigned char **data, int dataoff,
862 Setup_UUIE *setup)
863 {
864 int dir = CTINFO2DIR(ctinfo);
865 int ret;
866 int i;
867 __be16 port;
868 union nf_inet_addr addr;
869 typeof(set_h225_addr_hook) set_h225_addr;
870
871 pr_debug("nf_ct_q931: Setup\n");
872
873 if (setup->options & eSetup_UUIE_h245Address) {
874 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
875 &setup->h245Address);
876 if (ret < 0)
877 return -1;
878 }
879
880 set_h225_addr = rcu_dereference(set_h225_addr_hook);
881 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
882 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
883 ct->status & IPS_NAT_MASK &&
884 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
885 &addr, &port) &&
886 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
887 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
888 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
889 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
890 ret = set_h225_addr(skb, protoff, data, dataoff,
891 &setup->destCallSignalAddress,
892 &ct->tuplehash[!dir].tuple.src.u3,
893 ct->tuplehash[!dir].tuple.src.u.tcp.port);
894 if (ret < 0)
895 return -1;
896 }
897
898 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
899 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
900 ct->status & IPS_NAT_MASK &&
901 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
902 &addr, &port) &&
903 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
904 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
905 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
906 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
907 ret = set_h225_addr(skb, protoff, data, dataoff,
908 &setup->sourceCallSignalAddress,
909 &ct->tuplehash[!dir].tuple.dst.u3,
910 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
911 if (ret < 0)
912 return -1;
913 }
914
915 if (setup->options & eSetup_UUIE_fastStart) {
916 for (i = 0; i < setup->fastStart.count; i++) {
917 ret = process_olc(skb, ct, ctinfo,
918 protoff, data, dataoff,
919 &setup->fastStart.item[i]);
920 if (ret < 0)
921 return -1;
922 }
923 }
924
925 return 0;
926 }
927
928 /****************************************************************************/
929 static int process_callproceeding(struct sk_buff *skb,
930 struct nf_conn *ct,
931 enum ip_conntrack_info ctinfo,
932 unsigned int protoff,
933 unsigned char **data, int dataoff,
934 CallProceeding_UUIE *callproc)
935 {
936 int ret;
937 int i;
938
939 pr_debug("nf_ct_q931: CallProceeding\n");
940
941 if (callproc->options & eCallProceeding_UUIE_h245Address) {
942 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
943 &callproc->h245Address);
944 if (ret < 0)
945 return -1;
946 }
947
948 if (callproc->options & eCallProceeding_UUIE_fastStart) {
949 for (i = 0; i < callproc->fastStart.count; i++) {
950 ret = process_olc(skb, ct, ctinfo,
951 protoff, data, dataoff,
952 &callproc->fastStart.item[i]);
953 if (ret < 0)
954 return -1;
955 }
956 }
957
958 return 0;
959 }
960
961 /****************************************************************************/
962 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
963 enum ip_conntrack_info ctinfo,
964 unsigned int protoff,
965 unsigned char **data, int dataoff,
966 Connect_UUIE *connect)
967 {
968 int ret;
969 int i;
970
971 pr_debug("nf_ct_q931: Connect\n");
972
973 if (connect->options & eConnect_UUIE_h245Address) {
974 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
975 &connect->h245Address);
976 if (ret < 0)
977 return -1;
978 }
979
980 if (connect->options & eConnect_UUIE_fastStart) {
981 for (i = 0; i < connect->fastStart.count; i++) {
982 ret = process_olc(skb, ct, ctinfo,
983 protoff, data, dataoff,
984 &connect->fastStart.item[i]);
985 if (ret < 0)
986 return -1;
987 }
988 }
989
990 return 0;
991 }
992
993 /****************************************************************************/
994 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
995 enum ip_conntrack_info ctinfo,
996 unsigned int protoff,
997 unsigned char **data, int dataoff,
998 Alerting_UUIE *alert)
999 {
1000 int ret;
1001 int i;
1002
1003 pr_debug("nf_ct_q931: Alerting\n");
1004
1005 if (alert->options & eAlerting_UUIE_h245Address) {
1006 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1007 &alert->h245Address);
1008 if (ret < 0)
1009 return -1;
1010 }
1011
1012 if (alert->options & eAlerting_UUIE_fastStart) {
1013 for (i = 0; i < alert->fastStart.count; i++) {
1014 ret = process_olc(skb, ct, ctinfo,
1015 protoff, data, dataoff,
1016 &alert->fastStart.item[i]);
1017 if (ret < 0)
1018 return -1;
1019 }
1020 }
1021
1022 return 0;
1023 }
1024
1025 /****************************************************************************/
1026 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1027 enum ip_conntrack_info ctinfo,
1028 unsigned int protoff,
1029 unsigned char **data, int dataoff,
1030 Facility_UUIE *facility)
1031 {
1032 int ret;
1033 int i;
1034
1035 pr_debug("nf_ct_q931: Facility\n");
1036
1037 if (facility->reason.choice == eFacilityReason_callForwarded) {
1038 if (facility->options & eFacility_UUIE_alternativeAddress)
1039 return expect_callforwarding(skb, ct, ctinfo,
1040 protoff, data, dataoff,
1041 &facility->
1042 alternativeAddress);
1043 return 0;
1044 }
1045
1046 if (facility->options & eFacility_UUIE_h245Address) {
1047 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1048 &facility->h245Address);
1049 if (ret < 0)
1050 return -1;
1051 }
1052
1053 if (facility->options & eFacility_UUIE_fastStart) {
1054 for (i = 0; i < facility->fastStart.count; i++) {
1055 ret = process_olc(skb, ct, ctinfo,
1056 protoff, data, dataoff,
1057 &facility->fastStart.item[i]);
1058 if (ret < 0)
1059 return -1;
1060 }
1061 }
1062
1063 return 0;
1064 }
1065
1066 /****************************************************************************/
1067 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1068 enum ip_conntrack_info ctinfo,
1069 unsigned int protoff,
1070 unsigned char **data, int dataoff,
1071 Progress_UUIE *progress)
1072 {
1073 int ret;
1074 int i;
1075
1076 pr_debug("nf_ct_q931: Progress\n");
1077
1078 if (progress->options & eProgress_UUIE_h245Address) {
1079 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1080 &progress->h245Address);
1081 if (ret < 0)
1082 return -1;
1083 }
1084
1085 if (progress->options & eProgress_UUIE_fastStart) {
1086 for (i = 0; i < progress->fastStart.count; i++) {
1087 ret = process_olc(skb, ct, ctinfo,
1088 protoff, data, dataoff,
1089 &progress->fastStart.item[i]);
1090 if (ret < 0)
1091 return -1;
1092 }
1093 }
1094
1095 return 0;
1096 }
1097
1098 /****************************************************************************/
1099 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1100 enum ip_conntrack_info ctinfo,
1101 unsigned int protoff, unsigned char **data, int dataoff,
1102 Q931 *q931)
1103 {
1104 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1105 int i;
1106 int ret = 0;
1107
1108 switch (pdu->h323_message_body.choice) {
1109 case eH323_UU_PDU_h323_message_body_setup:
1110 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1111 &pdu->h323_message_body.setup);
1112 break;
1113 case eH323_UU_PDU_h323_message_body_callProceeding:
1114 ret = process_callproceeding(skb, ct, ctinfo,
1115 protoff, data, dataoff,
1116 &pdu->h323_message_body.
1117 callProceeding);
1118 break;
1119 case eH323_UU_PDU_h323_message_body_connect:
1120 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1121 &pdu->h323_message_body.connect);
1122 break;
1123 case eH323_UU_PDU_h323_message_body_alerting:
1124 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1125 &pdu->h323_message_body.alerting);
1126 break;
1127 case eH323_UU_PDU_h323_message_body_facility:
1128 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1129 &pdu->h323_message_body.facility);
1130 break;
1131 case eH323_UU_PDU_h323_message_body_progress:
1132 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1133 &pdu->h323_message_body.progress);
1134 break;
1135 default:
1136 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1137 pdu->h323_message_body.choice);
1138 break;
1139 }
1140
1141 if (ret < 0)
1142 return -1;
1143
1144 if (pdu->options & eH323_UU_PDU_h245Control) {
1145 for (i = 0; i < pdu->h245Control.count; i++) {
1146 ret = process_h245(skb, ct, ctinfo,
1147 protoff, data, dataoff,
1148 &pdu->h245Control.item[i]);
1149 if (ret < 0)
1150 return -1;
1151 }
1152 }
1153
1154 return 0;
1155 }
1156
1157 /****************************************************************************/
1158 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1159 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1160 {
1161 static Q931 q931;
1162 unsigned char *data = NULL;
1163 int datalen;
1164 int dataoff;
1165 int ret;
1166
1167 /* Until there's been traffic both ways, don't look in packets. */
1168 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1169 return NF_ACCEPT;
1170
1171 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1172
1173 spin_lock_bh(&nf_h323_lock);
1174
1175 /* Process each TPKT */
1176 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1177 &data, &datalen, &dataoff)) {
1178 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1179 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1180
1181 /* Decode Q.931 signal */
1182 ret = DecodeQ931(data, datalen, &q931);
1183 if (ret < 0) {
1184 pr_debug("nf_ct_q931: decoding error: %s\n",
1185 ret == H323_ERROR_BOUND ?
1186 "out of bound" : "out of range");
1187 /* We don't drop when decoding error */
1188 break;
1189 }
1190
1191 /* Process Q.931 signal */
1192 if (process_q931(skb, ct, ctinfo, protoff,
1193 &data, dataoff, &q931) < 0)
1194 goto drop;
1195 }
1196
1197 spin_unlock_bh(&nf_h323_lock);
1198 return NF_ACCEPT;
1199
1200 drop:
1201 spin_unlock_bh(&nf_h323_lock);
1202 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1203 return NF_DROP;
1204 }
1205
1206 /****************************************************************************/
1207 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1208 /* T.120 and H.245 */
1209 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1210 .timeout = 240,
1211 };
1212
1213 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1214 {
1215 .name = "Q.931",
1216 .me = THIS_MODULE,
1217 .tuple.src.l3num = AF_INET,
1218 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1219 .tuple.dst.protonum = IPPROTO_TCP,
1220 .help = q931_help,
1221 .expect_policy = &q931_exp_policy,
1222 },
1223 {
1224 .name = "Q.931",
1225 .me = THIS_MODULE,
1226 .tuple.src.l3num = AF_INET6,
1227 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1228 .tuple.dst.protonum = IPPROTO_TCP,
1229 .help = q931_help,
1230 .expect_policy = &q931_exp_policy,
1231 },
1232 };
1233
1234 /****************************************************************************/
1235 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1236 int *datalen)
1237 {
1238 const struct udphdr *uh;
1239 struct udphdr _uh;
1240 int dataoff;
1241
1242 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1243 if (uh == NULL)
1244 return NULL;
1245 dataoff = protoff + sizeof(_uh);
1246 if (dataoff >= skb->len)
1247 return NULL;
1248 *datalen = skb->len - dataoff;
1249 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1250 }
1251
1252 /****************************************************************************/
1253 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1254 union nf_inet_addr *addr,
1255 __be16 port)
1256 {
1257 struct net *net = nf_ct_net(ct);
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
1267 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1268 if (exp && exp->master == ct)
1269 return exp;
1270 return NULL;
1271 }
1272
1273 /****************************************************************************/
1274 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1275 enum ip_conntrack_info ctinfo,
1276 unsigned int protoff, unsigned char **data,
1277 TransportAddress *taddr, int count)
1278 {
1279 struct nf_ct_h323_master *info = nfct_help_data(ct);
1280 int dir = CTINFO2DIR(ctinfo);
1281 int ret = 0;
1282 int i;
1283 __be16 port;
1284 union nf_inet_addr addr;
1285 struct nf_conntrack_expect *exp;
1286 typeof(nat_q931_hook) nat_q931;
1287
1288 /* Look for the first related address */
1289 for (i = 0; i < count; i++) {
1290 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1291 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1292 sizeof(addr)) == 0 && port != 0)
1293 break;
1294 }
1295
1296 if (i >= count) /* Not found */
1297 return 0;
1298
1299 /* Create expect for Q.931 */
1300 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1301 return -1;
1302 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1303 gkrouted_only ? /* only accept calls from GK? */
1304 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1305 &ct->tuplehash[!dir].tuple.dst.u3,
1306 IPPROTO_TCP, NULL, &port);
1307 exp->helper = nf_conntrack_helper_q931;
1308 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1309
1310 nat_q931 = rcu_dereference(nat_q931_hook);
1311 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1312 ct->status & IPS_NAT_MASK) { /* Need NAT */
1313 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1314 taddr, i, port, exp);
1315 } else { /* Conntrack only */
1316 if (nf_ct_expect_related(exp) == 0) {
1317 pr_debug("nf_ct_ras: expect Q.931 ");
1318 nf_ct_dump_tuple(&exp->tuple);
1319
1320 /* Save port for looking up expect in processing RCF */
1321 info->sig_port[dir] = port;
1322 } else
1323 ret = -1;
1324 }
1325
1326 nf_ct_expect_put(exp);
1327
1328 return ret;
1329 }
1330
1331 /****************************************************************************/
1332 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1333 enum ip_conntrack_info ctinfo,
1334 unsigned int protoff,
1335 unsigned char **data, GatekeeperRequest *grq)
1336 {
1337 typeof(set_ras_addr_hook) set_ras_addr;
1338
1339 pr_debug("nf_ct_ras: GRQ\n");
1340
1341 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1342 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1343 ct->status & IPS_NAT_MASK) /* NATed */
1344 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1345 &grq->rasAddress, 1);
1346 return 0;
1347 }
1348
1349 /****************************************************************************/
1350 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1351 enum ip_conntrack_info ctinfo,
1352 unsigned int protoff,
1353 unsigned char **data, GatekeeperConfirm *gcf)
1354 {
1355 int dir = CTINFO2DIR(ctinfo);
1356 int ret = 0;
1357 __be16 port;
1358 union nf_inet_addr addr;
1359 struct nf_conntrack_expect *exp;
1360
1361 pr_debug("nf_ct_ras: GCF\n");
1362
1363 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1364 return 0;
1365
1366 /* Registration port is the same as discovery port */
1367 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1368 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1369 return 0;
1370
1371 /* Avoid RAS expectation loops. A GCF is never expected. */
1372 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1373 return 0;
1374
1375 /* Need new expect */
1376 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1377 return -1;
1378 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1379 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1380 IPPROTO_UDP, NULL, &port);
1381 exp->helper = nf_conntrack_helper_ras;
1382
1383 if (nf_ct_expect_related(exp) == 0) {
1384 pr_debug("nf_ct_ras: expect RAS ");
1385 nf_ct_dump_tuple(&exp->tuple);
1386 } else
1387 ret = -1;
1388
1389 nf_ct_expect_put(exp);
1390
1391 return ret;
1392 }
1393
1394 /****************************************************************************/
1395 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1396 enum ip_conntrack_info ctinfo,
1397 unsigned int protoff,
1398 unsigned char **data, RegistrationRequest *rrq)
1399 {
1400 struct nf_ct_h323_master *info = nfct_help_data(ct);
1401 int ret;
1402 typeof(set_ras_addr_hook) set_ras_addr;
1403
1404 pr_debug("nf_ct_ras: RRQ\n");
1405
1406 ret = expect_q931(skb, ct, ctinfo, protoff, data,
1407 rrq->callSignalAddress.item,
1408 rrq->callSignalAddress.count);
1409 if (ret < 0)
1410 return -1;
1411
1412 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1413 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1414 ct->status & IPS_NAT_MASK) {
1415 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1416 rrq->rasAddress.item,
1417 rrq->rasAddress.count);
1418 if (ret < 0)
1419 return -1;
1420 }
1421
1422 if (rrq->options & eRegistrationRequest_timeToLive) {
1423 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1424 info->timeout = rrq->timeToLive;
1425 } else
1426 info->timeout = default_rrq_ttl;
1427
1428 return 0;
1429 }
1430
1431 /****************************************************************************/
1432 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1433 enum ip_conntrack_info ctinfo,
1434 unsigned int protoff,
1435 unsigned char **data, RegistrationConfirm *rcf)
1436 {
1437 struct nf_ct_h323_master *info = nfct_help_data(ct);
1438 int dir = CTINFO2DIR(ctinfo);
1439 int ret;
1440 struct nf_conntrack_expect *exp;
1441 typeof(set_sig_addr_hook) set_sig_addr;
1442
1443 pr_debug("nf_ct_ras: RCF\n");
1444
1445 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1446 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1447 ct->status & IPS_NAT_MASK) {
1448 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1449 rcf->callSignalAddress.item,
1450 rcf->callSignalAddress.count);
1451 if (ret < 0)
1452 return -1;
1453 }
1454
1455 if (rcf->options & eRegistrationConfirm_timeToLive) {
1456 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1457 info->timeout = rcf->timeToLive;
1458 }
1459
1460 if (info->timeout > 0) {
1461 pr_debug("nf_ct_ras: set RAS connection timeout to "
1462 "%u seconds\n", info->timeout);
1463 nf_ct_refresh(ct, skb, info->timeout * HZ);
1464
1465 /* Set expect timeout */
1466 spin_lock_bh(&nf_conntrack_expect_lock);
1467 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1468 info->sig_port[!dir]);
1469 if (exp) {
1470 pr_debug("nf_ct_ras: set Q.931 expect "
1471 "timeout to %u seconds for",
1472 info->timeout);
1473 nf_ct_dump_tuple(&exp->tuple);
1474 mod_timer_pending(&exp->timeout,
1475 jiffies + info->timeout * HZ);
1476 }
1477 spin_unlock_bh(&nf_conntrack_expect_lock);
1478 }
1479
1480 return 0;
1481 }
1482
1483 /****************************************************************************/
1484 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1485 enum ip_conntrack_info ctinfo,
1486 unsigned int protoff,
1487 unsigned char **data, UnregistrationRequest *urq)
1488 {
1489 struct nf_ct_h323_master *info = nfct_help_data(ct);
1490 int dir = CTINFO2DIR(ctinfo);
1491 int ret;
1492 typeof(set_sig_addr_hook) set_sig_addr;
1493
1494 pr_debug("nf_ct_ras: URQ\n");
1495
1496 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1497 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1498 ct->status & IPS_NAT_MASK) {
1499 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1500 urq->callSignalAddress.item,
1501 urq->callSignalAddress.count);
1502 if (ret < 0)
1503 return -1;
1504 }
1505
1506 /* Clear old expect */
1507 nf_ct_remove_expectations(ct);
1508 info->sig_port[dir] = 0;
1509 info->sig_port[!dir] = 0;
1510
1511 /* Give it 30 seconds for UCF or URJ */
1512 nf_ct_refresh(ct, skb, 30 * HZ);
1513
1514 return 0;
1515 }
1516
1517 /****************************************************************************/
1518 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1519 enum ip_conntrack_info ctinfo,
1520 unsigned int protoff,
1521 unsigned char **data, AdmissionRequest *arq)
1522 {
1523 const struct nf_ct_h323_master *info = nfct_help_data(ct);
1524 int dir = CTINFO2DIR(ctinfo);
1525 __be16 port;
1526 union nf_inet_addr addr;
1527 typeof(set_h225_addr_hook) set_h225_addr;
1528
1529 pr_debug("nf_ct_ras: ARQ\n");
1530
1531 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1532 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1533 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1534 &addr, &port) &&
1535 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1536 port == info->sig_port[dir] &&
1537 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1538 set_h225_addr && ct->status & IPS_NAT_MASK) {
1539 /* Answering ARQ */
1540 return set_h225_addr(skb, protoff, data, 0,
1541 &arq->destCallSignalAddress,
1542 &ct->tuplehash[!dir].tuple.dst.u3,
1543 info->sig_port[!dir]);
1544 }
1545
1546 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1547 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1548 &addr, &port) &&
1549 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1550 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1551 ct->status & IPS_NAT_MASK) {
1552 /* Calling ARQ */
1553 return set_h225_addr(skb, protoff, data, 0,
1554 &arq->srcCallSignalAddress,
1555 &ct->tuplehash[!dir].tuple.dst.u3,
1556 port);
1557 }
1558
1559 return 0;
1560 }
1561
1562 /****************************************************************************/
1563 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1564 enum ip_conntrack_info ctinfo,
1565 unsigned int protoff,
1566 unsigned char **data, AdmissionConfirm *acf)
1567 {
1568 int dir = CTINFO2DIR(ctinfo);
1569 int ret = 0;
1570 __be16 port;
1571 union nf_inet_addr addr;
1572 struct nf_conntrack_expect *exp;
1573 typeof(set_sig_addr_hook) set_sig_addr;
1574
1575 pr_debug("nf_ct_ras: ACF\n");
1576
1577 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1578 &addr, &port))
1579 return 0;
1580
1581 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1582 /* Answering ACF */
1583 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1584 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1585 ct->status & IPS_NAT_MASK)
1586 return set_sig_addr(skb, ct, ctinfo, protoff, data,
1587 &acf->destCallSignalAddress, 1);
1588 return 0;
1589 }
1590
1591 /* Need new expect */
1592 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1593 return -1;
1594 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1595 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1596 IPPROTO_TCP, NULL, &port);
1597 exp->flags = NF_CT_EXPECT_PERMANENT;
1598 exp->helper = nf_conntrack_helper_q931;
1599
1600 if (nf_ct_expect_related(exp) == 0) {
1601 pr_debug("nf_ct_ras: expect Q.931 ");
1602 nf_ct_dump_tuple(&exp->tuple);
1603 } else
1604 ret = -1;
1605
1606 nf_ct_expect_put(exp);
1607
1608 return ret;
1609 }
1610
1611 /****************************************************************************/
1612 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1613 enum ip_conntrack_info ctinfo,
1614 unsigned int protoff,
1615 unsigned char **data, LocationRequest *lrq)
1616 {
1617 typeof(set_ras_addr_hook) set_ras_addr;
1618
1619 pr_debug("nf_ct_ras: LRQ\n");
1620
1621 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1622 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1623 ct->status & IPS_NAT_MASK)
1624 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1625 &lrq->replyAddress, 1);
1626 return 0;
1627 }
1628
1629 /****************************************************************************/
1630 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1631 enum ip_conntrack_info ctinfo,
1632 unsigned int protoff,
1633 unsigned char **data, LocationConfirm *lcf)
1634 {
1635 int dir = CTINFO2DIR(ctinfo);
1636 int ret = 0;
1637 __be16 port;
1638 union nf_inet_addr addr;
1639 struct nf_conntrack_expect *exp;
1640
1641 pr_debug("nf_ct_ras: LCF\n");
1642
1643 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1644 &addr, &port))
1645 return 0;
1646
1647 /* Need new expect for call signal */
1648 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1649 return -1;
1650 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1651 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1652 IPPROTO_TCP, NULL, &port);
1653 exp->flags = NF_CT_EXPECT_PERMANENT;
1654 exp->helper = nf_conntrack_helper_q931;
1655
1656 if (nf_ct_expect_related(exp) == 0) {
1657 pr_debug("nf_ct_ras: expect Q.931 ");
1658 nf_ct_dump_tuple(&exp->tuple);
1659 } else
1660 ret = -1;
1661
1662 nf_ct_expect_put(exp);
1663
1664 /* Ignore rasAddress */
1665
1666 return ret;
1667 }
1668
1669 /****************************************************************************/
1670 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1671 enum ip_conntrack_info ctinfo,
1672 unsigned int protoff,
1673 unsigned char **data, InfoRequestResponse *irr)
1674 {
1675 int ret;
1676 typeof(set_ras_addr_hook) set_ras_addr;
1677 typeof(set_sig_addr_hook) set_sig_addr;
1678
1679 pr_debug("nf_ct_ras: IRR\n");
1680
1681 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1682 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1683 ct->status & IPS_NAT_MASK) {
1684 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1685 &irr->rasAddress, 1);
1686 if (ret < 0)
1687 return -1;
1688 }
1689
1690 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1691 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1692 ct->status & IPS_NAT_MASK) {
1693 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1694 irr->callSignalAddress.item,
1695 irr->callSignalAddress.count);
1696 if (ret < 0)
1697 return -1;
1698 }
1699
1700 return 0;
1701 }
1702
1703 /****************************************************************************/
1704 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1705 enum ip_conntrack_info ctinfo,
1706 unsigned int protoff,
1707 unsigned char **data, RasMessage *ras)
1708 {
1709 switch (ras->choice) {
1710 case eRasMessage_gatekeeperRequest:
1711 return process_grq(skb, ct, ctinfo, protoff, data,
1712 &ras->gatekeeperRequest);
1713 case eRasMessage_gatekeeperConfirm:
1714 return process_gcf(skb, ct, ctinfo, protoff, data,
1715 &ras->gatekeeperConfirm);
1716 case eRasMessage_registrationRequest:
1717 return process_rrq(skb, ct, ctinfo, protoff, data,
1718 &ras->registrationRequest);
1719 case eRasMessage_registrationConfirm:
1720 return process_rcf(skb, ct, ctinfo, protoff, data,
1721 &ras->registrationConfirm);
1722 case eRasMessage_unregistrationRequest:
1723 return process_urq(skb, ct, ctinfo, protoff, data,
1724 &ras->unregistrationRequest);
1725 case eRasMessage_admissionRequest:
1726 return process_arq(skb, ct, ctinfo, protoff, data,
1727 &ras->admissionRequest);
1728 case eRasMessage_admissionConfirm:
1729 return process_acf(skb, ct, ctinfo, protoff, data,
1730 &ras->admissionConfirm);
1731 case eRasMessage_locationRequest:
1732 return process_lrq(skb, ct, ctinfo, protoff, data,
1733 &ras->locationRequest);
1734 case eRasMessage_locationConfirm:
1735 return process_lcf(skb, ct, ctinfo, protoff, data,
1736 &ras->locationConfirm);
1737 case eRasMessage_infoRequestResponse:
1738 return process_irr(skb, ct, ctinfo, protoff, data,
1739 &ras->infoRequestResponse);
1740 default:
1741 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1742 break;
1743 }
1744
1745 return 0;
1746 }
1747
1748 /****************************************************************************/
1749 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1750 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1751 {
1752 static RasMessage ras;
1753 unsigned char *data;
1754 int datalen = 0;
1755 int ret;
1756
1757 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1758
1759 spin_lock_bh(&nf_h323_lock);
1760
1761 /* Get UDP data */
1762 data = get_udp_data(skb, protoff, &datalen);
1763 if (data == NULL)
1764 goto accept;
1765 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1766 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1767
1768 /* Decode RAS message */
1769 ret = DecodeRasMessage(data, datalen, &ras);
1770 if (ret < 0) {
1771 pr_debug("nf_ct_ras: decoding error: %s\n",
1772 ret == H323_ERROR_BOUND ?
1773 "out of bound" : "out of range");
1774 goto accept;
1775 }
1776
1777 /* Process RAS message */
1778 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1779 goto drop;
1780
1781 accept:
1782 spin_unlock_bh(&nf_h323_lock);
1783 return NF_ACCEPT;
1784
1785 drop:
1786 spin_unlock_bh(&nf_h323_lock);
1787 nf_ct_helper_log(skb, ct, "cannot process RAS message");
1788 return NF_DROP;
1789 }
1790
1791 /****************************************************************************/
1792 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1793 .max_expected = 32,
1794 .timeout = 240,
1795 };
1796
1797 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1798 {
1799 .name = "RAS",
1800 .me = THIS_MODULE,
1801 .tuple.src.l3num = AF_INET,
1802 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1803 .tuple.dst.protonum = IPPROTO_UDP,
1804 .help = ras_help,
1805 .expect_policy = &ras_exp_policy,
1806 },
1807 {
1808 .name = "RAS",
1809 .me = THIS_MODULE,
1810 .tuple.src.l3num = AF_INET6,
1811 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1812 .tuple.dst.protonum = IPPROTO_UDP,
1813 .help = ras_help,
1814 .expect_policy = &ras_exp_policy,
1815 },
1816 };
1817
1818 static int __init h323_helper_init(void)
1819 {
1820 int ret;
1821
1822 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1823 if (ret < 0)
1824 return ret;
1825 ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1826 ARRAY_SIZE(nf_conntrack_helper_q931));
1827 if (ret < 0)
1828 goto err1;
1829 ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1830 ARRAY_SIZE(nf_conntrack_helper_ras));
1831 if (ret < 0)
1832 goto err2;
1833
1834 return 0;
1835 err2:
1836 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1837 ARRAY_SIZE(nf_conntrack_helper_q931));
1838 err1:
1839 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1840 return ret;
1841 }
1842
1843 static void __exit h323_helper_exit(void)
1844 {
1845 nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1846 ARRAY_SIZE(nf_conntrack_helper_ras));
1847 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1848 ARRAY_SIZE(nf_conntrack_helper_q931));
1849 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1850 }
1851
1852 /****************************************************************************/
1853 static void __exit nf_conntrack_h323_fini(void)
1854 {
1855 h323_helper_exit();
1856 kfree(h323_buffer);
1857 pr_debug("nf_ct_h323: fini\n");
1858 }
1859
1860 /****************************************************************************/
1861 static int __init nf_conntrack_h323_init(void)
1862 {
1863 int ret;
1864
1865 NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1866
1867 h323_buffer = kmalloc(65536, GFP_KERNEL);
1868 if (!h323_buffer)
1869 return -ENOMEM;
1870 ret = h323_helper_init();
1871 if (ret < 0)
1872 goto err1;
1873 pr_debug("nf_ct_h323: init success\n");
1874 return 0;
1875 err1:
1876 kfree(h323_buffer);
1877 return ret;
1878 }
1879
1880 /****************************************************************************/
1881 module_init(nf_conntrack_h323_init);
1882 module_exit(nf_conntrack_h323_fini);
1883
1884 EXPORT_SYMBOL_GPL(get_h225_addr);
1885 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1886 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1887 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1888 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1889 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1890 EXPORT_SYMBOL_GPL(nat_t120_hook);
1891 EXPORT_SYMBOL_GPL(nat_h245_hook);
1892 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1893 EXPORT_SYMBOL_GPL(nat_q931_hook);
1894
1895 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1896 MODULE_DESCRIPTION("H.323 connection tracking helper");
1897 MODULE_LICENSE("GPL");
1898 MODULE_ALIAS("ip_conntrack_h323");
1899 MODULE_ALIAS_NFCT_HELPER("RAS");
1900 MODULE_ALIAS_NFCT_HELPER("Q.931");
1901 MODULE_ALIAS_NFCT_HELPER("H.245");