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14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/ctype.h>
17#include <linux/inet.h>
18#include <linux/in.h>
19#include <linux/ip.h>
20#include <linux/slab.h>
21#include <linux/udp.h>
22#include <linux/tcp.h>
23#include <linux/skbuff.h>
24#include <net/route.h>
25#include <net/ip6_route.h>
26#include <linux/netfilter_ipv6.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
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
46static bool callforward_filter __read_mostly = true;
47module_param(callforward_filter, bool, 0600);
48MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
49 "if both endpoints are on different sides "
50 "(determined by routing information)");
51
52
53int (*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;
58int (*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;
63int (*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;
68int (*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;
73int (*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;
82int (*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;
89int (*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;
96int (*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;
103int (*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
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
118static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
119 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
120 unsigned char **data, int *datalen, int *dataoff)
121{
122 struct nf_ct_h323_master *info = nfct_help_data(ct);
123 int dir = CTINFO2DIR(ctinfo);
124 const struct tcphdr *th;
125 struct tcphdr _tcph;
126 int tcpdatalen;
127 int tcpdataoff;
128 unsigned char *tpkt;
129 int tpktlen;
130 int tpktoff;
131
132
133 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
134 if (th == NULL)
135 return 0;
136
137
138 tcpdataoff = protoff + th->doff * 4;
139
140
141 tcpdatalen = skb->len - tcpdataoff;
142 if (tcpdatalen <= 0)
143 goto clear_out;
144
145 if (*data == NULL) {
146
147 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
148 h323_buffer);
149 BUG_ON(tpkt == NULL);
150
151
152 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
153
154 if (info->tpkt_len[dir] > 0) {
155 pr_debug("nf_ct_h323: previous packet "
156 "indicated separate TPKT data of %hu "
157 "bytes\n", info->tpkt_len[dir]);
158 if (info->tpkt_len[dir] <= tcpdatalen) {
159
160
161 *data = tpkt;
162 *datalen = info->tpkt_len[dir];
163 *dataoff = 0;
164 goto out;
165 }
166
167
168 pr_debug("nf_ct_h323: fragmented TPKT\n");
169 goto clear_out;
170 }
171
172
173 return 0;
174 }
175 tpktoff = 0;
176 } else {
177 tpktoff = *dataoff + *datalen;
178 tcpdatalen -= tpktoff;
179 if (tcpdatalen <= 4)
180 goto clear_out;
181 tpkt = *data + *datalen;
182
183
184 if (tpkt[0] != 0x03 || tpkt[1] != 0)
185 goto clear_out;
186 }
187
188
189 tpktlen = tpkt[2] * 256 + tpkt[3];
190 if (tpktlen < 4)
191 goto clear_out;
192 if (tpktlen > tcpdatalen) {
193 if (tcpdatalen == 4) {
194
195 pr_debug("nf_ct_h323: separate TPKT header indicates "
196 "there will be TPKT data of %hu bytes\n",
197 tpktlen - 4);
198 info->tpkt_len[dir] = tpktlen - 4;
199 return 0;
200 }
201
202 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
203 goto clear_out;
204 }
205
206
207 *data = tpkt + 4;
208 *datalen = tpktlen - 4;
209 *dataoff = tpktoff + 4;
210
211 out:
212
213 info->tpkt_len[dir] = 0;
214 return 1;
215
216 clear_out:
217 info->tpkt_len[dir] = 0;
218 return 0;
219}
220
221static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
222 H245_TransportAddress *taddr,
223 union nf_inet_addr *addr, __be16 *port)
224{
225 const unsigned char *p;
226 int len;
227
228 if (taddr->choice != eH245_TransportAddress_unicastAddress)
229 return 0;
230
231 switch (taddr->unicastAddress.choice) {
232 case eUnicastAddress_iPAddress:
233 if (nf_ct_l3num(ct) != AF_INET)
234 return 0;
235 p = data + taddr->unicastAddress.iPAddress.network;
236 len = 4;
237 break;
238 case eUnicastAddress_iP6Address:
239 if (nf_ct_l3num(ct) != AF_INET6)
240 return 0;
241 p = data + taddr->unicastAddress.iP6Address.network;
242 len = 16;
243 break;
244 default:
245 return 0;
246 }
247
248 memcpy(addr, p, len);
249 memset((void *)addr + len, 0, sizeof(*addr) - len);
250 memcpy(port, p + len, sizeof(__be16));
251
252 return 1;
253}
254
255static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
256 enum ip_conntrack_info ctinfo,
257 unsigned int protoff,
258 unsigned char **data, int dataoff,
259 H245_TransportAddress *taddr)
260{
261 int dir = CTINFO2DIR(ctinfo);
262 int ret = 0;
263 __be16 port;
264 __be16 rtp_port, rtcp_port;
265 union nf_inet_addr addr;
266 struct nf_conntrack_expect *rtp_exp;
267 struct nf_conntrack_expect *rtcp_exp;
268 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
269
270
271 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
272 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
273 port == 0)
274 return 0;
275
276
277 rtp_port = port & ~htons(1);
278 rtcp_port = port | htons(1);
279
280
281 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
282 return -1;
283 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
284 &ct->tuplehash[!dir].tuple.src.u3,
285 &ct->tuplehash[!dir].tuple.dst.u3,
286 IPPROTO_UDP, NULL, &rtp_port);
287
288
289 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
290 nf_ct_expect_put(rtp_exp);
291 return -1;
292 }
293 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
294 &ct->tuplehash[!dir].tuple.src.u3,
295 &ct->tuplehash[!dir].tuple.dst.u3,
296 IPPROTO_UDP, NULL, &rtcp_port);
297
298 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
299 &ct->tuplehash[!dir].tuple.dst.u3,
300 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
301 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
302 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
303 ct->status & IPS_NAT_MASK) {
304
305 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
306 taddr, port, rtp_port, rtp_exp, rtcp_exp);
307 } else {
308 if (nf_ct_expect_related(rtp_exp, 0) == 0) {
309 if (nf_ct_expect_related(rtcp_exp, 0) == 0) {
310 pr_debug("nf_ct_h323: expect RTP ");
311 nf_ct_dump_tuple(&rtp_exp->tuple);
312 pr_debug("nf_ct_h323: expect RTCP ");
313 nf_ct_dump_tuple(&rtcp_exp->tuple);
314 } else {
315 nf_ct_unexpect_related(rtp_exp);
316 ret = -1;
317 }
318 } else
319 ret = -1;
320 }
321
322 nf_ct_expect_put(rtp_exp);
323 nf_ct_expect_put(rtcp_exp);
324
325 return ret;
326}
327
328static int expect_t120(struct sk_buff *skb,
329 struct nf_conn *ct,
330 enum ip_conntrack_info ctinfo,
331 unsigned int protoff,
332 unsigned char **data, int dataoff,
333 H245_TransportAddress *taddr)
334{
335 int dir = CTINFO2DIR(ctinfo);
336 int ret = 0;
337 __be16 port;
338 union nf_inet_addr addr;
339 struct nf_conntrack_expect *exp;
340 typeof(nat_t120_hook) nat_t120;
341
342
343 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
344 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
345 port == 0)
346 return 0;
347
348
349 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
350 return -1;
351 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
352 &ct->tuplehash[!dir].tuple.src.u3,
353 &ct->tuplehash[!dir].tuple.dst.u3,
354 IPPROTO_TCP, NULL, &port);
355 exp->flags = NF_CT_EXPECT_PERMANENT;
356
357 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
358 &ct->tuplehash[!dir].tuple.dst.u3,
359 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
360 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
361 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
362 ct->status & IPS_NAT_MASK) {
363
364 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
365 port, exp);
366 } else {
367 if (nf_ct_expect_related(exp, 0) == 0) {
368 pr_debug("nf_ct_h323: expect T.120 ");
369 nf_ct_dump_tuple(&exp->tuple);
370 } else
371 ret = -1;
372 }
373
374 nf_ct_expect_put(exp);
375
376 return ret;
377}
378
379static int process_h245_channel(struct sk_buff *skb,
380 struct nf_conn *ct,
381 enum ip_conntrack_info ctinfo,
382 unsigned int protoff,
383 unsigned char **data, int dataoff,
384 H2250LogicalChannelParameters *channel)
385{
386 int ret;
387
388 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
389
390 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
391 &channel->mediaChannel);
392 if (ret < 0)
393 return -1;
394 }
395
396 if (channel->
397 options & eH2250LogicalChannelParameters_mediaControlChannel) {
398
399 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
400 &channel->mediaControlChannel);
401 if (ret < 0)
402 return -1;
403 }
404
405 return 0;
406}
407
408static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
409 enum ip_conntrack_info ctinfo,
410 unsigned int protoff,
411 unsigned char **data, int dataoff,
412 OpenLogicalChannel *olc)
413{
414 int ret;
415
416 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
417
418 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
419 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
420 {
421 ret = process_h245_channel(skb, ct, ctinfo,
422 protoff, data, dataoff,
423 &olc->
424 forwardLogicalChannelParameters.
425 multiplexParameters.
426 h2250LogicalChannelParameters);
427 if (ret < 0)
428 return -1;
429 }
430
431 if ((olc->options &
432 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
433 (olc->reverseLogicalChannelParameters.options &
434 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
435 && (olc->reverseLogicalChannelParameters.multiplexParameters.
436 choice ==
437 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
438 {
439 ret =
440 process_h245_channel(skb, ct, ctinfo,
441 protoff, data, dataoff,
442 &olc->
443 reverseLogicalChannelParameters.
444 multiplexParameters.
445 h2250LogicalChannelParameters);
446 if (ret < 0)
447 return -1;
448 }
449
450 if ((olc->options & eOpenLogicalChannel_separateStack) &&
451 olc->forwardLogicalChannelParameters.dataType.choice ==
452 eDataType_data &&
453 olc->forwardLogicalChannelParameters.dataType.data.application.
454 choice == eDataApplicationCapability_application_t120 &&
455 olc->forwardLogicalChannelParameters.dataType.data.application.
456 t120.choice == eDataProtocolCapability_separateLANStack &&
457 olc->separateStack.networkAddress.choice ==
458 eNetworkAccessParameters_networkAddress_localAreaAddress) {
459 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
460 &olc->separateStack.networkAddress.
461 localAreaAddress);
462 if (ret < 0)
463 return -1;
464 }
465
466 return 0;
467}
468
469static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
470 enum ip_conntrack_info ctinfo,
471 unsigned int protoff, unsigned char **data, int dataoff,
472 OpenLogicalChannelAck *olca)
473{
474 H2250LogicalChannelAckParameters *ack;
475 int ret;
476
477 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
478
479 if ((olca->options &
480 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
481 (olca->reverseLogicalChannelParameters.options &
482 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
483 && (olca->reverseLogicalChannelParameters.multiplexParameters.
484 choice ==
485 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
486 {
487 ret = process_h245_channel(skb, ct, ctinfo,
488 protoff, data, dataoff,
489 &olca->
490 reverseLogicalChannelParameters.
491 multiplexParameters.
492 h2250LogicalChannelParameters);
493 if (ret < 0)
494 return -1;
495 }
496
497 if ((olca->options &
498 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
499 (olca->forwardMultiplexAckParameters.choice ==
500 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
501 {
502 ack = &olca->forwardMultiplexAckParameters.
503 h2250LogicalChannelAckParameters;
504 if (ack->options &
505 eH2250LogicalChannelAckParameters_mediaChannel) {
506
507 ret = expect_rtp_rtcp(skb, ct, ctinfo,
508 protoff, data, dataoff,
509 &ack->mediaChannel);
510 if (ret < 0)
511 return -1;
512 }
513
514 if (ack->options &
515 eH2250LogicalChannelAckParameters_mediaControlChannel) {
516
517 ret = expect_rtp_rtcp(skb, ct, ctinfo,
518 protoff, data, dataoff,
519 &ack->mediaControlChannel);
520 if (ret < 0)
521 return -1;
522 }
523 }
524
525 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
526 olca->separateStack.networkAddress.choice ==
527 eNetworkAccessParameters_networkAddress_localAreaAddress) {
528 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
529 &olca->separateStack.networkAddress.
530 localAreaAddress);
531 if (ret < 0)
532 return -1;
533 }
534
535 return 0;
536}
537
538static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
539 enum ip_conntrack_info ctinfo,
540 unsigned int protoff, unsigned char **data, int dataoff,
541 MultimediaSystemControlMessage *mscm)
542{
543 switch (mscm->choice) {
544 case eMultimediaSystemControlMessage_request:
545 if (mscm->request.choice ==
546 eRequestMessage_openLogicalChannel) {
547 return process_olc(skb, ct, ctinfo,
548 protoff, data, dataoff,
549 &mscm->request.openLogicalChannel);
550 }
551 pr_debug("nf_ct_h323: H.245 Request %d\n",
552 mscm->request.choice);
553 break;
554 case eMultimediaSystemControlMessage_response:
555 if (mscm->response.choice ==
556 eResponseMessage_openLogicalChannelAck) {
557 return process_olca(skb, ct, ctinfo,
558 protoff, data, dataoff,
559 &mscm->response.
560 openLogicalChannelAck);
561 }
562 pr_debug("nf_ct_h323: H.245 Response %d\n",
563 mscm->response.choice);
564 break;
565 default:
566 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
567 break;
568 }
569
570 return 0;
571}
572
573static int h245_help(struct sk_buff *skb, unsigned int protoff,
574 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
575{
576 static MultimediaSystemControlMessage mscm;
577 unsigned char *data = NULL;
578 int datalen;
579 int dataoff;
580 int ret;
581
582
583 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
584 return NF_ACCEPT;
585
586 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
587
588 spin_lock_bh(&nf_h323_lock);
589
590
591 while (get_tpkt_data(skb, protoff, ct, ctinfo,
592 &data, &datalen, &dataoff)) {
593 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
594 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
595
596
597 ret = DecodeMultimediaSystemControlMessage(data, datalen,
598 &mscm);
599 if (ret < 0) {
600 pr_debug("nf_ct_h245: decoding error: %s\n",
601 ret == H323_ERROR_BOUND ?
602 "out of bound" : "out of range");
603
604 break;
605 }
606
607
608 if (process_h245(skb, ct, ctinfo, protoff,
609 &data, dataoff, &mscm) < 0)
610 goto drop;
611 }
612
613 spin_unlock_bh(&nf_h323_lock);
614 return NF_ACCEPT;
615
616 drop:
617 spin_unlock_bh(&nf_h323_lock);
618 nf_ct_helper_log(skb, ct, "cannot process H.245 message");
619 return NF_DROP;
620}
621
622static const struct nf_conntrack_expect_policy h245_exp_policy = {
623 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 ,
624 .timeout = 240,
625};
626
627static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
628 .name = "H.245",
629 .me = THIS_MODULE,
630 .tuple.src.l3num = AF_UNSPEC,
631 .tuple.dst.protonum = IPPROTO_UDP,
632 .help = h245_help,
633 .expect_policy = &h245_exp_policy,
634};
635
636int get_h225_addr(struct nf_conn *ct, unsigned char *data,
637 TransportAddress *taddr,
638 union nf_inet_addr *addr, __be16 *port)
639{
640 const unsigned char *p;
641 int len;
642
643 switch (taddr->choice) {
644 case eTransportAddress_ipAddress:
645 if (nf_ct_l3num(ct) != AF_INET)
646 return 0;
647 p = data + taddr->ipAddress.ip;
648 len = 4;
649 break;
650 case eTransportAddress_ip6Address:
651 if (nf_ct_l3num(ct) != AF_INET6)
652 return 0;
653 p = data + taddr->ip6Address.ip;
654 len = 16;
655 break;
656 default:
657 return 0;
658 }
659
660 memcpy(addr, p, len);
661 memset((void *)addr + len, 0, sizeof(*addr) - len);
662 memcpy(port, p + len, sizeof(__be16));
663
664 return 1;
665}
666
667static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
668 enum ip_conntrack_info ctinfo,
669 unsigned int protoff, unsigned char **data, int dataoff,
670 TransportAddress *taddr)
671{
672 int dir = CTINFO2DIR(ctinfo);
673 int ret = 0;
674 __be16 port;
675 union nf_inet_addr addr;
676 struct nf_conntrack_expect *exp;
677 typeof(nat_h245_hook) nat_h245;
678
679
680 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
681 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
682 port == 0)
683 return 0;
684
685
686 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
687 return -1;
688 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
689 &ct->tuplehash[!dir].tuple.src.u3,
690 &ct->tuplehash[!dir].tuple.dst.u3,
691 IPPROTO_TCP, NULL, &port);
692 exp->helper = &nf_conntrack_helper_h245;
693
694 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
695 &ct->tuplehash[!dir].tuple.dst.u3,
696 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
697 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
698 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
699 ct->status & IPS_NAT_MASK) {
700
701 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
702 port, exp);
703 } else {
704 if (nf_ct_expect_related(exp, 0) == 0) {
705 pr_debug("nf_ct_q931: expect H.245 ");
706 nf_ct_dump_tuple(&exp->tuple);
707 } else
708 ret = -1;
709 }
710
711 nf_ct_expect_put(exp);
712
713 return ret;
714}
715
716
717
718
719static int callforward_do_filter(struct net *net,
720 const union nf_inet_addr *src,
721 const union nf_inet_addr *dst,
722 u_int8_t family)
723{
724 int ret = 0;
725
726 switch (family) {
727 case AF_INET: {
728 struct flowi4 fl1, fl2;
729 struct rtable *rt1, *rt2;
730
731 memset(&fl1, 0, sizeof(fl1));
732 fl1.daddr = src->ip;
733
734 memset(&fl2, 0, sizeof(fl2));
735 fl2.daddr = dst->ip;
736 if (!nf_ip_route(net, (struct dst_entry **)&rt1,
737 flowi4_to_flowi(&fl1), false)) {
738 if (!nf_ip_route(net, (struct dst_entry **)&rt2,
739 flowi4_to_flowi(&fl2), false)) {
740 if (rt_nexthop(rt1, fl1.daddr) ==
741 rt_nexthop(rt2, fl2.daddr) &&
742 rt1->dst.dev == rt2->dst.dev)
743 ret = 1;
744 dst_release(&rt2->dst);
745 }
746 dst_release(&rt1->dst);
747 }
748 break;
749 }
750#if IS_ENABLED(CONFIG_IPV6)
751 case AF_INET6: {
752 struct rt6_info *rt1, *rt2;
753 struct flowi6 fl1, fl2;
754
755 memset(&fl1, 0, sizeof(fl1));
756 fl1.daddr = src->in6;
757
758 memset(&fl2, 0, sizeof(fl2));
759 fl2.daddr = dst->in6;
760 if (!nf_ip6_route(net, (struct dst_entry **)&rt1,
761 flowi6_to_flowi(&fl1), false)) {
762 if (!nf_ip6_route(net, (struct dst_entry **)&rt2,
763 flowi6_to_flowi(&fl2), false)) {
764 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
765 rt6_nexthop(rt2, &fl2.daddr)) &&
766 rt1->dst.dev == rt2->dst.dev)
767 ret = 1;
768 dst_release(&rt2->dst);
769 }
770 dst_release(&rt1->dst);
771 }
772 break;
773 }
774#endif
775 }
776 return ret;
777
778}
779
780static int expect_callforwarding(struct sk_buff *skb,
781 struct nf_conn *ct,
782 enum ip_conntrack_info ctinfo,
783 unsigned int protoff,
784 unsigned char **data, int dataoff,
785 TransportAddress *taddr)
786{
787 int dir = CTINFO2DIR(ctinfo);
788 int ret = 0;
789 __be16 port;
790 union nf_inet_addr addr;
791 struct nf_conntrack_expect *exp;
792 struct net *net = nf_ct_net(ct);
793 typeof(nat_callforwarding_hook) nat_callforwarding;
794
795
796 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
797 return 0;
798
799
800
801
802 if (callforward_filter &&
803 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
804 nf_ct_l3num(ct))) {
805 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
806 return 0;
807 }
808
809
810 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
811 return -1;
812 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
813 &ct->tuplehash[!dir].tuple.src.u3, &addr,
814 IPPROTO_TCP, NULL, &port);
815 exp->helper = nf_conntrack_helper_q931;
816
817 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
818 &ct->tuplehash[!dir].tuple.dst.u3,
819 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
820 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
821 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
822 ct->status & IPS_NAT_MASK) {
823
824 ret = nat_callforwarding(skb, ct, ctinfo,
825 protoff, data, dataoff,
826 taddr, port, exp);
827 } else {
828 if (nf_ct_expect_related(exp, 0) == 0) {
829 pr_debug("nf_ct_q931: expect Call Forwarding ");
830 nf_ct_dump_tuple(&exp->tuple);
831 } else
832 ret = -1;
833 }
834
835 nf_ct_expect_put(exp);
836
837 return ret;
838}
839
840static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
841 enum ip_conntrack_info ctinfo,
842 unsigned int protoff,
843 unsigned char **data, int dataoff,
844 Setup_UUIE *setup)
845{
846 int dir = CTINFO2DIR(ctinfo);
847 int ret;
848 int i;
849 __be16 port;
850 union nf_inet_addr addr;
851 typeof(set_h225_addr_hook) set_h225_addr;
852
853 pr_debug("nf_ct_q931: Setup\n");
854
855 if (setup->options & eSetup_UUIE_h245Address) {
856 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
857 &setup->h245Address);
858 if (ret < 0)
859 return -1;
860 }
861
862 set_h225_addr = rcu_dereference(set_h225_addr_hook);
863 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
864 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
865 ct->status & IPS_NAT_MASK &&
866 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
867 &addr, &port) &&
868 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
869 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
870 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
871 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
872 ret = set_h225_addr(skb, protoff, data, dataoff,
873 &setup->destCallSignalAddress,
874 &ct->tuplehash[!dir].tuple.src.u3,
875 ct->tuplehash[!dir].tuple.src.u.tcp.port);
876 if (ret < 0)
877 return -1;
878 }
879
880 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
881 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
882 ct->status & IPS_NAT_MASK &&
883 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
884 &addr, &port) &&
885 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
886 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
887 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
888 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
889 ret = set_h225_addr(skb, protoff, data, dataoff,
890 &setup->sourceCallSignalAddress,
891 &ct->tuplehash[!dir].tuple.dst.u3,
892 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
893 if (ret < 0)
894 return -1;
895 }
896
897 if (setup->options & eSetup_UUIE_fastStart) {
898 for (i = 0; i < setup->fastStart.count; i++) {
899 ret = process_olc(skb, ct, ctinfo,
900 protoff, data, dataoff,
901 &setup->fastStart.item[i]);
902 if (ret < 0)
903 return -1;
904 }
905 }
906
907 return 0;
908}
909
910static int process_callproceeding(struct sk_buff *skb,
911 struct nf_conn *ct,
912 enum ip_conntrack_info ctinfo,
913 unsigned int protoff,
914 unsigned char **data, int dataoff,
915 CallProceeding_UUIE *callproc)
916{
917 int ret;
918 int i;
919
920 pr_debug("nf_ct_q931: CallProceeding\n");
921
922 if (callproc->options & eCallProceeding_UUIE_h245Address) {
923 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
924 &callproc->h245Address);
925 if (ret < 0)
926 return -1;
927 }
928
929 if (callproc->options & eCallProceeding_UUIE_fastStart) {
930 for (i = 0; i < callproc->fastStart.count; i++) {
931 ret = process_olc(skb, ct, ctinfo,
932 protoff, data, dataoff,
933 &callproc->fastStart.item[i]);
934 if (ret < 0)
935 return -1;
936 }
937 }
938
939 return 0;
940}
941
942static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
943 enum ip_conntrack_info ctinfo,
944 unsigned int protoff,
945 unsigned char **data, int dataoff,
946 Connect_UUIE *connect)
947{
948 int ret;
949 int i;
950
951 pr_debug("nf_ct_q931: Connect\n");
952
953 if (connect->options & eConnect_UUIE_h245Address) {
954 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
955 &connect->h245Address);
956 if (ret < 0)
957 return -1;
958 }
959
960 if (connect->options & eConnect_UUIE_fastStart) {
961 for (i = 0; i < connect->fastStart.count; i++) {
962 ret = process_olc(skb, ct, ctinfo,
963 protoff, data, dataoff,
964 &connect->fastStart.item[i]);
965 if (ret < 0)
966 return -1;
967 }
968 }
969
970 return 0;
971}
972
973static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
974 enum ip_conntrack_info ctinfo,
975 unsigned int protoff,
976 unsigned char **data, int dataoff,
977 Alerting_UUIE *alert)
978{
979 int ret;
980 int i;
981
982 pr_debug("nf_ct_q931: Alerting\n");
983
984 if (alert->options & eAlerting_UUIE_h245Address) {
985 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
986 &alert->h245Address);
987 if (ret < 0)
988 return -1;
989 }
990
991 if (alert->options & eAlerting_UUIE_fastStart) {
992 for (i = 0; i < alert->fastStart.count; i++) {
993 ret = process_olc(skb, ct, ctinfo,
994 protoff, data, dataoff,
995 &alert->fastStart.item[i]);
996 if (ret < 0)
997 return -1;
998 }
999 }
1000
1001 return 0;
1002}
1003
1004static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1005 enum ip_conntrack_info ctinfo,
1006 unsigned int protoff,
1007 unsigned char **data, int dataoff,
1008 Facility_UUIE *facility)
1009{
1010 int ret;
1011 int i;
1012
1013 pr_debug("nf_ct_q931: Facility\n");
1014
1015 if (facility->reason.choice == eFacilityReason_callForwarded) {
1016 if (facility->options & eFacility_UUIE_alternativeAddress)
1017 return expect_callforwarding(skb, ct, ctinfo,
1018 protoff, data, dataoff,
1019 &facility->
1020 alternativeAddress);
1021 return 0;
1022 }
1023
1024 if (facility->options & eFacility_UUIE_h245Address) {
1025 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1026 &facility->h245Address);
1027 if (ret < 0)
1028 return -1;
1029 }
1030
1031 if (facility->options & eFacility_UUIE_fastStart) {
1032 for (i = 0; i < facility->fastStart.count; i++) {
1033 ret = process_olc(skb, ct, ctinfo,
1034 protoff, data, dataoff,
1035 &facility->fastStart.item[i]);
1036 if (ret < 0)
1037 return -1;
1038 }
1039 }
1040
1041 return 0;
1042}
1043
1044static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1045 enum ip_conntrack_info ctinfo,
1046 unsigned int protoff,
1047 unsigned char **data, int dataoff,
1048 Progress_UUIE *progress)
1049{
1050 int ret;
1051 int i;
1052
1053 pr_debug("nf_ct_q931: Progress\n");
1054
1055 if (progress->options & eProgress_UUIE_h245Address) {
1056 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1057 &progress->h245Address);
1058 if (ret < 0)
1059 return -1;
1060 }
1061
1062 if (progress->options & eProgress_UUIE_fastStart) {
1063 for (i = 0; i < progress->fastStart.count; i++) {
1064 ret = process_olc(skb, ct, ctinfo,
1065 protoff, data, dataoff,
1066 &progress->fastStart.item[i]);
1067 if (ret < 0)
1068 return -1;
1069 }
1070 }
1071
1072 return 0;
1073}
1074
1075static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1076 enum ip_conntrack_info ctinfo,
1077 unsigned int protoff, unsigned char **data, int dataoff,
1078 Q931 *q931)
1079{
1080 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1081 int i;
1082 int ret = 0;
1083
1084 switch (pdu->h323_message_body.choice) {
1085 case eH323_UU_PDU_h323_message_body_setup:
1086 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1087 &pdu->h323_message_body.setup);
1088 break;
1089 case eH323_UU_PDU_h323_message_body_callProceeding:
1090 ret = process_callproceeding(skb, ct, ctinfo,
1091 protoff, data, dataoff,
1092 &pdu->h323_message_body.
1093 callProceeding);
1094 break;
1095 case eH323_UU_PDU_h323_message_body_connect:
1096 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1097 &pdu->h323_message_body.connect);
1098 break;
1099 case eH323_UU_PDU_h323_message_body_alerting:
1100 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1101 &pdu->h323_message_body.alerting);
1102 break;
1103 case eH323_UU_PDU_h323_message_body_facility:
1104 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1105 &pdu->h323_message_body.facility);
1106 break;
1107 case eH323_UU_PDU_h323_message_body_progress:
1108 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1109 &pdu->h323_message_body.progress);
1110 break;
1111 default:
1112 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1113 pdu->h323_message_body.choice);
1114 break;
1115 }
1116
1117 if (ret < 0)
1118 return -1;
1119
1120 if (pdu->options & eH323_UU_PDU_h245Control) {
1121 for (i = 0; i < pdu->h245Control.count; i++) {
1122 ret = process_h245(skb, ct, ctinfo,
1123 protoff, data, dataoff,
1124 &pdu->h245Control.item[i]);
1125 if (ret < 0)
1126 return -1;
1127 }
1128 }
1129
1130 return 0;
1131}
1132
1133static int q931_help(struct sk_buff *skb, unsigned int protoff,
1134 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1135{
1136 static Q931 q931;
1137 unsigned char *data = NULL;
1138 int datalen;
1139 int dataoff;
1140 int ret;
1141
1142
1143 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1144 return NF_ACCEPT;
1145
1146 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1147
1148 spin_lock_bh(&nf_h323_lock);
1149
1150
1151 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1152 &data, &datalen, &dataoff)) {
1153 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1154 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1155
1156
1157 ret = DecodeQ931(data, datalen, &q931);
1158 if (ret < 0) {
1159 pr_debug("nf_ct_q931: decoding error: %s\n",
1160 ret == H323_ERROR_BOUND ?
1161 "out of bound" : "out of range");
1162
1163 break;
1164 }
1165
1166
1167 if (process_q931(skb, ct, ctinfo, protoff,
1168 &data, dataoff, &q931) < 0)
1169 goto drop;
1170 }
1171
1172 spin_unlock_bh(&nf_h323_lock);
1173 return NF_ACCEPT;
1174
1175 drop:
1176 spin_unlock_bh(&nf_h323_lock);
1177 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1178 return NF_DROP;
1179}
1180
1181static const struct nf_conntrack_expect_policy q931_exp_policy = {
1182
1183 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1184 .timeout = 240,
1185};
1186
1187static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1188 {
1189 .name = "Q.931",
1190 .me = THIS_MODULE,
1191 .tuple.src.l3num = AF_INET,
1192 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1193 .tuple.dst.protonum = IPPROTO_TCP,
1194 .help = q931_help,
1195 .expect_policy = &q931_exp_policy,
1196 },
1197 {
1198 .name = "Q.931",
1199 .me = THIS_MODULE,
1200 .tuple.src.l3num = AF_INET6,
1201 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1202 .tuple.dst.protonum = IPPROTO_TCP,
1203 .help = q931_help,
1204 .expect_policy = &q931_exp_policy,
1205 },
1206};
1207
1208static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1209 int *datalen)
1210{
1211 const struct udphdr *uh;
1212 struct udphdr _uh;
1213 int dataoff;
1214
1215 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1216 if (uh == NULL)
1217 return NULL;
1218 dataoff = protoff + sizeof(_uh);
1219 if (dataoff >= skb->len)
1220 return NULL;
1221 *datalen = skb->len - dataoff;
1222 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1223}
1224
1225static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1226 union nf_inet_addr *addr,
1227 __be16 port)
1228{
1229 struct net *net = nf_ct_net(ct);
1230 struct nf_conntrack_expect *exp;
1231 struct nf_conntrack_tuple tuple;
1232
1233 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1234 tuple.src.u.tcp.port = 0;
1235 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1236 tuple.dst.u.tcp.port = port;
1237 tuple.dst.protonum = IPPROTO_TCP;
1238
1239 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1240 if (exp && exp->master == ct)
1241 return exp;
1242 return NULL;
1243}
1244
1245static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1246 enum ip_conntrack_info ctinfo,
1247 unsigned int protoff, unsigned char **data,
1248 TransportAddress *taddr, int count)
1249{
1250 struct nf_ct_h323_master *info = nfct_help_data(ct);
1251 int dir = CTINFO2DIR(ctinfo);
1252 int ret = 0;
1253 int i;
1254 __be16 port;
1255 union nf_inet_addr addr;
1256 struct nf_conntrack_expect *exp;
1257 typeof(nat_q931_hook) nat_q931;
1258
1259
1260 for (i = 0; i < count; i++) {
1261 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1262 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1263 sizeof(addr)) == 0 && port != 0)
1264 break;
1265 }
1266
1267 if (i >= count)
1268 return 0;
1269
1270
1271 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1272 return -1;
1273 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1274 gkrouted_only ?
1275 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1276 &ct->tuplehash[!dir].tuple.dst.u3,
1277 IPPROTO_TCP, NULL, &port);
1278 exp->helper = nf_conntrack_helper_q931;
1279 exp->flags = NF_CT_EXPECT_PERMANENT;
1280
1281 nat_q931 = rcu_dereference(nat_q931_hook);
1282 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1283 ct->status & IPS_NAT_MASK) {
1284 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1285 taddr, i, port, exp);
1286 } else {
1287 if (nf_ct_expect_related(exp, 0) == 0) {
1288 pr_debug("nf_ct_ras: expect Q.931 ");
1289 nf_ct_dump_tuple(&exp->tuple);
1290
1291
1292 info->sig_port[dir] = port;
1293 } else
1294 ret = -1;
1295 }
1296
1297 nf_ct_expect_put(exp);
1298
1299 return ret;
1300}
1301
1302static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1303 enum ip_conntrack_info ctinfo,
1304 unsigned int protoff,
1305 unsigned char **data, GatekeeperRequest *grq)
1306{
1307 typeof(set_ras_addr_hook) set_ras_addr;
1308
1309 pr_debug("nf_ct_ras: GRQ\n");
1310
1311 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1312 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1313 ct->status & IPS_NAT_MASK)
1314 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1315 &grq->rasAddress, 1);
1316 return 0;
1317}
1318
1319static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1320 enum ip_conntrack_info ctinfo,
1321 unsigned int protoff,
1322 unsigned char **data, GatekeeperConfirm *gcf)
1323{
1324 int dir = CTINFO2DIR(ctinfo);
1325 int ret = 0;
1326 __be16 port;
1327 union nf_inet_addr addr;
1328 struct nf_conntrack_expect *exp;
1329
1330 pr_debug("nf_ct_ras: GCF\n");
1331
1332 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1333 return 0;
1334
1335
1336 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1337 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1338 return 0;
1339
1340
1341 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1342 return 0;
1343
1344
1345 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1346 return -1;
1347 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1348 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1349 IPPROTO_UDP, NULL, &port);
1350 exp->helper = nf_conntrack_helper_ras;
1351
1352 if (nf_ct_expect_related(exp, 0) == 0) {
1353 pr_debug("nf_ct_ras: expect RAS ");
1354 nf_ct_dump_tuple(&exp->tuple);
1355 } else
1356 ret = -1;
1357
1358 nf_ct_expect_put(exp);
1359
1360 return ret;
1361}
1362
1363static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1364 enum ip_conntrack_info ctinfo,
1365 unsigned int protoff,
1366 unsigned char **data, RegistrationRequest *rrq)
1367{
1368 struct nf_ct_h323_master *info = nfct_help_data(ct);
1369 int ret;
1370 typeof(set_ras_addr_hook) set_ras_addr;
1371
1372 pr_debug("nf_ct_ras: RRQ\n");
1373
1374 ret = expect_q931(skb, ct, ctinfo, protoff, data,
1375 rrq->callSignalAddress.item,
1376 rrq->callSignalAddress.count);
1377 if (ret < 0)
1378 return -1;
1379
1380 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1381 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1382 ct->status & IPS_NAT_MASK) {
1383 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1384 rrq->rasAddress.item,
1385 rrq->rasAddress.count);
1386 if (ret < 0)
1387 return -1;
1388 }
1389
1390 if (rrq->options & eRegistrationRequest_timeToLive) {
1391 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1392 info->timeout = rrq->timeToLive;
1393 } else
1394 info->timeout = default_rrq_ttl;
1395
1396 return 0;
1397}
1398
1399static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1400 enum ip_conntrack_info ctinfo,
1401 unsigned int protoff,
1402 unsigned char **data, RegistrationConfirm *rcf)
1403{
1404 struct nf_ct_h323_master *info = nfct_help_data(ct);
1405 int dir = CTINFO2DIR(ctinfo);
1406 int ret;
1407 struct nf_conntrack_expect *exp;
1408 typeof(set_sig_addr_hook) set_sig_addr;
1409
1410 pr_debug("nf_ct_ras: RCF\n");
1411
1412 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1413 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1414 ct->status & IPS_NAT_MASK) {
1415 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1416 rcf->callSignalAddress.item,
1417 rcf->callSignalAddress.count);
1418 if (ret < 0)
1419 return -1;
1420 }
1421
1422 if (rcf->options & eRegistrationConfirm_timeToLive) {
1423 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1424 info->timeout = rcf->timeToLive;
1425 }
1426
1427 if (info->timeout > 0) {
1428 pr_debug("nf_ct_ras: set RAS connection timeout to "
1429 "%u seconds\n", info->timeout);
1430 nf_ct_refresh(ct, skb, info->timeout * HZ);
1431
1432
1433 spin_lock_bh(&nf_conntrack_expect_lock);
1434 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1435 info->sig_port[!dir]);
1436 if (exp) {
1437 pr_debug("nf_ct_ras: set Q.931 expect "
1438 "timeout to %u seconds for",
1439 info->timeout);
1440 nf_ct_dump_tuple(&exp->tuple);
1441 mod_timer_pending(&exp->timeout,
1442 jiffies + info->timeout * HZ);
1443 }
1444 spin_unlock_bh(&nf_conntrack_expect_lock);
1445 }
1446
1447 return 0;
1448}
1449
1450static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1451 enum ip_conntrack_info ctinfo,
1452 unsigned int protoff,
1453 unsigned char **data, UnregistrationRequest *urq)
1454{
1455 struct nf_ct_h323_master *info = nfct_help_data(ct);
1456 int dir = CTINFO2DIR(ctinfo);
1457 int ret;
1458 typeof(set_sig_addr_hook) set_sig_addr;
1459
1460 pr_debug("nf_ct_ras: URQ\n");
1461
1462 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1463 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1464 ct->status & IPS_NAT_MASK) {
1465 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1466 urq->callSignalAddress.item,
1467 urq->callSignalAddress.count);
1468 if (ret < 0)
1469 return -1;
1470 }
1471
1472
1473 nf_ct_remove_expectations(ct);
1474 info->sig_port[dir] = 0;
1475 info->sig_port[!dir] = 0;
1476
1477
1478 nf_ct_refresh(ct, skb, 30 * HZ);
1479
1480 return 0;
1481}
1482
1483static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1484 enum ip_conntrack_info ctinfo,
1485 unsigned int protoff,
1486 unsigned char **data, AdmissionRequest *arq)
1487{
1488 const struct nf_ct_h323_master *info = nfct_help_data(ct);
1489 int dir = CTINFO2DIR(ctinfo);
1490 __be16 port;
1491 union nf_inet_addr addr;
1492 typeof(set_h225_addr_hook) set_h225_addr;
1493
1494 pr_debug("nf_ct_ras: ARQ\n");
1495
1496 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1497 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1498 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1499 &addr, &port) &&
1500 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1501 port == info->sig_port[dir] &&
1502 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1503 set_h225_addr && ct->status & IPS_NAT_MASK) {
1504
1505 return set_h225_addr(skb, protoff, data, 0,
1506 &arq->destCallSignalAddress,
1507 &ct->tuplehash[!dir].tuple.dst.u3,
1508 info->sig_port[!dir]);
1509 }
1510
1511 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1512 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1513 &addr, &port) &&
1514 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1515 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1516 ct->status & IPS_NAT_MASK) {
1517
1518 return set_h225_addr(skb, protoff, data, 0,
1519 &arq->srcCallSignalAddress,
1520 &ct->tuplehash[!dir].tuple.dst.u3,
1521 port);
1522 }
1523
1524 return 0;
1525}
1526
1527static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1528 enum ip_conntrack_info ctinfo,
1529 unsigned int protoff,
1530 unsigned char **data, AdmissionConfirm *acf)
1531{
1532 int dir = CTINFO2DIR(ctinfo);
1533 int ret = 0;
1534 __be16 port;
1535 union nf_inet_addr addr;
1536 struct nf_conntrack_expect *exp;
1537 typeof(set_sig_addr_hook) set_sig_addr;
1538
1539 pr_debug("nf_ct_ras: ACF\n");
1540
1541 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1542 &addr, &port))
1543 return 0;
1544
1545 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1546
1547 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1548 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1549 ct->status & IPS_NAT_MASK)
1550 return set_sig_addr(skb, ct, ctinfo, protoff, data,
1551 &acf->destCallSignalAddress, 1);
1552 return 0;
1553 }
1554
1555
1556 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1557 return -1;
1558 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1559 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1560 IPPROTO_TCP, NULL, &port);
1561 exp->flags = NF_CT_EXPECT_PERMANENT;
1562 exp->helper = nf_conntrack_helper_q931;
1563
1564 if (nf_ct_expect_related(exp, 0) == 0) {
1565 pr_debug("nf_ct_ras: expect Q.931 ");
1566 nf_ct_dump_tuple(&exp->tuple);
1567 } else
1568 ret = -1;
1569
1570 nf_ct_expect_put(exp);
1571
1572 return ret;
1573}
1574
1575static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1576 enum ip_conntrack_info ctinfo,
1577 unsigned int protoff,
1578 unsigned char **data, LocationRequest *lrq)
1579{
1580 typeof(set_ras_addr_hook) set_ras_addr;
1581
1582 pr_debug("nf_ct_ras: LRQ\n");
1583
1584 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1585 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1586 ct->status & IPS_NAT_MASK)
1587 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1588 &lrq->replyAddress, 1);
1589 return 0;
1590}
1591
1592static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1593 enum ip_conntrack_info ctinfo,
1594 unsigned int protoff,
1595 unsigned char **data, LocationConfirm *lcf)
1596{
1597 int dir = CTINFO2DIR(ctinfo);
1598 int ret = 0;
1599 __be16 port;
1600 union nf_inet_addr addr;
1601 struct nf_conntrack_expect *exp;
1602
1603 pr_debug("nf_ct_ras: LCF\n");
1604
1605 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1606 &addr, &port))
1607 return 0;
1608
1609
1610 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1611 return -1;
1612 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1613 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1614 IPPROTO_TCP, NULL, &port);
1615 exp->flags = NF_CT_EXPECT_PERMANENT;
1616 exp->helper = nf_conntrack_helper_q931;
1617
1618 if (nf_ct_expect_related(exp, 0) == 0) {
1619 pr_debug("nf_ct_ras: expect Q.931 ");
1620 nf_ct_dump_tuple(&exp->tuple);
1621 } else
1622 ret = -1;
1623
1624 nf_ct_expect_put(exp);
1625
1626
1627
1628 return ret;
1629}
1630
1631static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1632 enum ip_conntrack_info ctinfo,
1633 unsigned int protoff,
1634 unsigned char **data, InfoRequestResponse *irr)
1635{
1636 int ret;
1637 typeof(set_ras_addr_hook) set_ras_addr;
1638 typeof(set_sig_addr_hook) set_sig_addr;
1639
1640 pr_debug("nf_ct_ras: IRR\n");
1641
1642 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1643 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1644 ct->status & IPS_NAT_MASK) {
1645 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1646 &irr->rasAddress, 1);
1647 if (ret < 0)
1648 return -1;
1649 }
1650
1651 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1652 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1653 ct->status & IPS_NAT_MASK) {
1654 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1655 irr->callSignalAddress.item,
1656 irr->callSignalAddress.count);
1657 if (ret < 0)
1658 return -1;
1659 }
1660
1661 return 0;
1662}
1663
1664static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1665 enum ip_conntrack_info ctinfo,
1666 unsigned int protoff,
1667 unsigned char **data, RasMessage *ras)
1668{
1669 switch (ras->choice) {
1670 case eRasMessage_gatekeeperRequest:
1671 return process_grq(skb, ct, ctinfo, protoff, data,
1672 &ras->gatekeeperRequest);
1673 case eRasMessage_gatekeeperConfirm:
1674 return process_gcf(skb, ct, ctinfo, protoff, data,
1675 &ras->gatekeeperConfirm);
1676 case eRasMessage_registrationRequest:
1677 return process_rrq(skb, ct, ctinfo, protoff, data,
1678 &ras->registrationRequest);
1679 case eRasMessage_registrationConfirm:
1680 return process_rcf(skb, ct, ctinfo, protoff, data,
1681 &ras->registrationConfirm);
1682 case eRasMessage_unregistrationRequest:
1683 return process_urq(skb, ct, ctinfo, protoff, data,
1684 &ras->unregistrationRequest);
1685 case eRasMessage_admissionRequest:
1686 return process_arq(skb, ct, ctinfo, protoff, data,
1687 &ras->admissionRequest);
1688 case eRasMessage_admissionConfirm:
1689 return process_acf(skb, ct, ctinfo, protoff, data,
1690 &ras->admissionConfirm);
1691 case eRasMessage_locationRequest:
1692 return process_lrq(skb, ct, ctinfo, protoff, data,
1693 &ras->locationRequest);
1694 case eRasMessage_locationConfirm:
1695 return process_lcf(skb, ct, ctinfo, protoff, data,
1696 &ras->locationConfirm);
1697 case eRasMessage_infoRequestResponse:
1698 return process_irr(skb, ct, ctinfo, protoff, data,
1699 &ras->infoRequestResponse);
1700 default:
1701 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1702 break;
1703 }
1704
1705 return 0;
1706}
1707
1708static int ras_help(struct sk_buff *skb, unsigned int protoff,
1709 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1710{
1711 static RasMessage ras;
1712 unsigned char *data;
1713 int datalen = 0;
1714 int ret;
1715
1716 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1717
1718 spin_lock_bh(&nf_h323_lock);
1719
1720
1721 data = get_udp_data(skb, protoff, &datalen);
1722 if (data == NULL)
1723 goto accept;
1724 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1725 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1726
1727
1728 ret = DecodeRasMessage(data, datalen, &ras);
1729 if (ret < 0) {
1730 pr_debug("nf_ct_ras: decoding error: %s\n",
1731 ret == H323_ERROR_BOUND ?
1732 "out of bound" : "out of range");
1733 goto accept;
1734 }
1735
1736
1737 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1738 goto drop;
1739
1740 accept:
1741 spin_unlock_bh(&nf_h323_lock);
1742 return NF_ACCEPT;
1743
1744 drop:
1745 spin_unlock_bh(&nf_h323_lock);
1746 nf_ct_helper_log(skb, ct, "cannot process RAS message");
1747 return NF_DROP;
1748}
1749
1750static const struct nf_conntrack_expect_policy ras_exp_policy = {
1751 .max_expected = 32,
1752 .timeout = 240,
1753};
1754
1755static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1756 {
1757 .name = "RAS",
1758 .me = THIS_MODULE,
1759 .tuple.src.l3num = AF_INET,
1760 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1761 .tuple.dst.protonum = IPPROTO_UDP,
1762 .help = ras_help,
1763 .expect_policy = &ras_exp_policy,
1764 },
1765 {
1766 .name = "RAS",
1767 .me = THIS_MODULE,
1768 .tuple.src.l3num = AF_INET6,
1769 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1770 .tuple.dst.protonum = IPPROTO_UDP,
1771 .help = ras_help,
1772 .expect_policy = &ras_exp_policy,
1773 },
1774};
1775
1776static int __init h323_helper_init(void)
1777{
1778 int ret;
1779
1780 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1781 if (ret < 0)
1782 return ret;
1783 ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1784 ARRAY_SIZE(nf_conntrack_helper_q931));
1785 if (ret < 0)
1786 goto err1;
1787 ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1788 ARRAY_SIZE(nf_conntrack_helper_ras));
1789 if (ret < 0)
1790 goto err2;
1791
1792 return 0;
1793err2:
1794 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1795 ARRAY_SIZE(nf_conntrack_helper_q931));
1796err1:
1797 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1798 return ret;
1799}
1800
1801static void __exit h323_helper_exit(void)
1802{
1803 nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1804 ARRAY_SIZE(nf_conntrack_helper_ras));
1805 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1806 ARRAY_SIZE(nf_conntrack_helper_q931));
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1808}
1809
1810static void __exit nf_conntrack_h323_fini(void)
1811{
1812 h323_helper_exit();
1813 kfree(h323_buffer);
1814 pr_debug("nf_ct_h323: fini\n");
1815}
1816
1817static int __init nf_conntrack_h323_init(void)
1818{
1819 int ret;
1820
1821 NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1822
1823 h323_buffer = kmalloc(65536, GFP_KERNEL);
1824 if (!h323_buffer)
1825 return -ENOMEM;
1826 ret = h323_helper_init();
1827 if (ret < 0)
1828 goto err1;
1829 pr_debug("nf_ct_h323: init success\n");
1830 return 0;
1831err1:
1832 kfree(h323_buffer);
1833 return ret;
1834}
1835
1836module_init(nf_conntrack_h323_init);
1837module_exit(nf_conntrack_h323_fini);
1838
1839EXPORT_SYMBOL_GPL(get_h225_addr);
1840EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1841EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1842EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1843EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1844EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1845EXPORT_SYMBOL_GPL(nat_t120_hook);
1846EXPORT_SYMBOL_GPL(nat_h245_hook);
1847EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1848EXPORT_SYMBOL_GPL(nat_q931_hook);
1849
1850MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1851MODULE_DESCRIPTION("H.323 connection tracking helper");
1852MODULE_LICENSE("GPL");
1853MODULE_ALIAS("ip_conntrack_h323");
1854MODULE_ALIAS_NFCT_HELPER("RAS");
1855MODULE_ALIAS_NFCT_HELPER("Q.931");
1856MODULE_ALIAS_NFCT_HELPER("H.245");
1857
