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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 if (!tpkt)
150 goto clear_out;
151
152
153 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
154
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
161
162 *data = tpkt;
163 *datalen = info->tpkt_len[dir];
164 *dataoff = 0;
165 goto out;
166 }
167
168
169 pr_debug("nf_ct_h323: fragmented TPKT\n");
170 goto clear_out;
171 }
172
173
174 return 0;
175 }
176 tpktoff = 0;
177 } else {
178 tpktoff = *dataoff + *datalen;
179 tcpdatalen -= tpktoff;
180 if (tcpdatalen <= 4)
181 goto clear_out;
182 tpkt = *data + *datalen;
183
184
185 if (tpkt[0] != 0x03 || tpkt[1] != 0)
186 goto clear_out;
187 }
188
189
190 tpktlen = tpkt[2] * 256 + tpkt[3];
191 if (tpktlen < 4)
192 goto clear_out;
193 if (tpktlen > tcpdatalen) {
194 if (tcpdatalen == 4) {
195
196 pr_debug("nf_ct_h323: separate TPKT header indicates "
197 "there will be TPKT data of %d 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
208 *data = tpkt + 4;
209 *datalen = tpktlen - 4;
210 *dataoff = tpktoff + 4;
211
212 out:
213
214 info->tpkt_len[dir] = 0;
215 return 1;
216
217 clear_out:
218 info->tpkt_len[dir] = 0;
219 return 0;
220}
221
222static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
223 H245_TransportAddress *taddr,
224 union nf_inet_addr *addr, __be16 *port)
225{
226 const unsigned char *p;
227 int len;
228
229 if (taddr->choice != eH245_TransportAddress_unicastAddress)
230 return 0;
231
232 switch (taddr->unicastAddress.choice) {
233 case eUnicastAddress_iPAddress:
234 if (nf_ct_l3num(ct) != AF_INET)
235 return 0;
236 p = data + taddr->unicastAddress.iPAddress.network;
237 len = 4;
238 break;
239 case eUnicastAddress_iP6Address:
240 if (nf_ct_l3num(ct) != AF_INET6)
241 return 0;
242 p = data + taddr->unicastAddress.iP6Address.network;
243 len = 16;
244 break;
245 default:
246 return 0;
247 }
248
249 memcpy(addr, p, len);
250 memset((void *)addr + len, 0, sizeof(*addr) - len);
251 memcpy(port, p + len, sizeof(__be16));
252
253 return 1;
254}
255
256static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
257 enum ip_conntrack_info ctinfo,
258 unsigned int protoff,
259 unsigned char **data, int dataoff,
260 H245_TransportAddress *taddr)
261{
262 int dir = CTINFO2DIR(ctinfo);
263 int ret = 0;
264 __be16 port;
265 __be16 rtp_port, rtcp_port;
266 union nf_inet_addr addr;
267 struct nf_conntrack_expect *rtp_exp;
268 struct nf_conntrack_expect *rtcp_exp;
269 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
270
271
272 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
273 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
274 port == 0)
275 return 0;
276
277
278 rtp_port = port & ~htons(1);
279 rtcp_port = port | htons(1);
280
281
282 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
283 return -1;
284 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
285 &ct->tuplehash[!dir].tuple.src.u3,
286 &ct->tuplehash[!dir].tuple.dst.u3,
287 IPPROTO_UDP, NULL, &rtp_port);
288
289
290 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
291 nf_ct_expect_put(rtp_exp);
292 return -1;
293 }
294 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
295 &ct->tuplehash[!dir].tuple.src.u3,
296 &ct->tuplehash[!dir].tuple.dst.u3,
297 IPPROTO_UDP, NULL, &rtcp_port);
298
299 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
300 &ct->tuplehash[!dir].tuple.dst.u3,
301 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
302 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
303 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
304 ct->status & IPS_NAT_MASK) {
305
306 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
307 taddr, port, rtp_port, rtp_exp, rtcp_exp);
308 } else {
309 if (nf_ct_expect_related(rtp_exp, 0) == 0) {
310 if (nf_ct_expect_related(rtcp_exp, 0) == 0) {
311 pr_debug("nf_ct_h323: expect RTP ");
312 nf_ct_dump_tuple(&rtp_exp->tuple);
313 pr_debug("nf_ct_h323: expect RTCP ");
314 nf_ct_dump_tuple(&rtcp_exp->tuple);
315 } else {
316 nf_ct_unexpect_related(rtp_exp);
317 ret = -1;
318 }
319 } else
320 ret = -1;
321 }
322
323 nf_ct_expect_put(rtp_exp);
324 nf_ct_expect_put(rtcp_exp);
325
326 return ret;
327}
328
329static int expect_t120(struct sk_buff *skb,
330 struct nf_conn *ct,
331 enum ip_conntrack_info ctinfo,
332 unsigned int protoff,
333 unsigned char **data, int dataoff,
334 H245_TransportAddress *taddr)
335{
336 int dir = CTINFO2DIR(ctinfo);
337 int ret = 0;
338 __be16 port;
339 union nf_inet_addr addr;
340 struct nf_conntrack_expect *exp;
341 typeof(nat_t120_hook) nat_t120;
342
343
344 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
345 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
346 port == 0)
347 return 0;
348
349
350 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
351 return -1;
352 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
353 &ct->tuplehash[!dir].tuple.src.u3,
354 &ct->tuplehash[!dir].tuple.dst.u3,
355 IPPROTO_TCP, NULL, &port);
356 exp->flags = NF_CT_EXPECT_PERMANENT;
357
358 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
359 &ct->tuplehash[!dir].tuple.dst.u3,
360 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
361 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
362 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
363 ct->status & IPS_NAT_MASK) {
364
365 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
366 port, exp);
367 } else {
368 if (nf_ct_expect_related(exp, 0) == 0) {
369 pr_debug("nf_ct_h323: expect T.120 ");
370 nf_ct_dump_tuple(&exp->tuple);
371 } else
372 ret = -1;
373 }
374
375 nf_ct_expect_put(exp);
376
377 return ret;
378}
379
380static int process_h245_channel(struct sk_buff *skb,
381 struct nf_conn *ct,
382 enum ip_conntrack_info ctinfo,
383 unsigned int protoff,
384 unsigned char **data, int dataoff,
385 H2250LogicalChannelParameters *channel)
386{
387 int ret;
388
389 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
390
391 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
392 &channel->mediaChannel);
393 if (ret < 0)
394 return -1;
395 }
396
397 if (channel->
398 options & eH2250LogicalChannelParameters_mediaControlChannel) {
399
400 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
401 &channel->mediaControlChannel);
402 if (ret < 0)
403 return -1;
404 }
405
406 return 0;
407}
408
409static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
410 enum ip_conntrack_info ctinfo,
411 unsigned int protoff,
412 unsigned char **data, int dataoff,
413 OpenLogicalChannel *olc)
414{
415 int ret;
416
417 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
418
419 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
420 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
421 {
422 ret = process_h245_channel(skb, ct, ctinfo,
423 protoff, data, dataoff,
424 &olc->
425 forwardLogicalChannelParameters.
426 multiplexParameters.
427 h2250LogicalChannelParameters);
428 if (ret < 0)
429 return -1;
430 }
431
432 if ((olc->options &
433 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
434 (olc->reverseLogicalChannelParameters.options &
435 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
436 && (olc->reverseLogicalChannelParameters.multiplexParameters.
437 choice ==
438 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
439 {
440 ret =
441 process_h245_channel(skb, ct, ctinfo,
442 protoff, data, dataoff,
443 &olc->
444 reverseLogicalChannelParameters.
445 multiplexParameters.
446 h2250LogicalChannelParameters);
447 if (ret < 0)
448 return -1;
449 }
450
451 if ((olc->options & eOpenLogicalChannel_separateStack) &&
452 olc->forwardLogicalChannelParameters.dataType.choice ==
453 eDataType_data &&
454 olc->forwardLogicalChannelParameters.dataType.data.application.
455 choice == eDataApplicationCapability_application_t120 &&
456 olc->forwardLogicalChannelParameters.dataType.data.application.
457 t120.choice == eDataProtocolCapability_separateLANStack &&
458 olc->separateStack.networkAddress.choice ==
459 eNetworkAccessParameters_networkAddress_localAreaAddress) {
460 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
461 &olc->separateStack.networkAddress.
462 localAreaAddress);
463 if (ret < 0)
464 return -1;
465 }
466
467 return 0;
468}
469
470static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
471 enum ip_conntrack_info ctinfo,
472 unsigned int protoff, unsigned char **data, int dataoff,
473 OpenLogicalChannelAck *olca)
474{
475 H2250LogicalChannelAckParameters *ack;
476 int ret;
477
478 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
479
480 if ((olca->options &
481 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
482 (olca->reverseLogicalChannelParameters.options &
483 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
484 && (olca->reverseLogicalChannelParameters.multiplexParameters.
485 choice ==
486 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
487 {
488 ret = process_h245_channel(skb, ct, ctinfo,
489 protoff, data, dataoff,
490 &olca->
491 reverseLogicalChannelParameters.
492 multiplexParameters.
493 h2250LogicalChannelParameters);
494 if (ret < 0)
495 return -1;
496 }
497
498 if ((olca->options &
499 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
500 (olca->forwardMultiplexAckParameters.choice ==
501 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
502 {
503 ack = &olca->forwardMultiplexAckParameters.
504 h2250LogicalChannelAckParameters;
505 if (ack->options &
506 eH2250LogicalChannelAckParameters_mediaChannel) {
507
508 ret = expect_rtp_rtcp(skb, ct, ctinfo,
509 protoff, data, dataoff,
510 &ack->mediaChannel);
511 if (ret < 0)
512 return -1;
513 }
514
515 if (ack->options &
516 eH2250LogicalChannelAckParameters_mediaControlChannel) {
517
518 ret = expect_rtp_rtcp(skb, ct, ctinfo,
519 protoff, data, dataoff,
520 &ack->mediaControlChannel);
521 if (ret < 0)
522 return -1;
523 }
524 }
525
526 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
527 olca->separateStack.networkAddress.choice ==
528 eNetworkAccessParameters_networkAddress_localAreaAddress) {
529 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
530 &olca->separateStack.networkAddress.
531 localAreaAddress);
532 if (ret < 0)
533 return -1;
534 }
535
536 return 0;
537}
538
539static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
540 enum ip_conntrack_info ctinfo,
541 unsigned int protoff, unsigned char **data, int dataoff,
542 MultimediaSystemControlMessage *mscm)
543{
544 switch (mscm->choice) {
545 case eMultimediaSystemControlMessage_request:
546 if (mscm->request.choice ==
547 eRequestMessage_openLogicalChannel) {
548 return process_olc(skb, ct, ctinfo,
549 protoff, data, dataoff,
550 &mscm->request.openLogicalChannel);
551 }
552 pr_debug("nf_ct_h323: H.245 Request %d\n",
553 mscm->request.choice);
554 break;
555 case eMultimediaSystemControlMessage_response:
556 if (mscm->response.choice ==
557 eResponseMessage_openLogicalChannelAck) {
558 return process_olca(skb, ct, ctinfo,
559 protoff, data, dataoff,
560 &mscm->response.
561 openLogicalChannelAck);
562 }
563 pr_debug("nf_ct_h323: H.245 Response %d\n",
564 mscm->response.choice);
565 break;
566 default:
567 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
568 break;
569 }
570
571 return 0;
572}
573
574static int h245_help(struct sk_buff *skb, unsigned int protoff,
575 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
576{
577 static MultimediaSystemControlMessage mscm;
578 unsigned char *data = NULL;
579 int datalen;
580 int dataoff;
581 int ret;
582
583
584 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
585 return NF_ACCEPT;
586
587 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
588
589 spin_lock_bh(&nf_h323_lock);
590
591
592 while (get_tpkt_data(skb, protoff, ct, ctinfo,
593 &data, &datalen, &dataoff)) {
594 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
595 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
596
597
598 ret = DecodeMultimediaSystemControlMessage(data, datalen,
599 &mscm);
600 if (ret < 0) {
601 pr_debug("nf_ct_h245: decoding error: %s\n",
602 ret == H323_ERROR_BOUND ?
603 "out of bound" : "out of range");
604
605 break;
606 }
607
608
609 if (process_h245(skb, ct, ctinfo, protoff,
610 &data, dataoff, &mscm) < 0)
611 goto drop;
612 }
613
614 spin_unlock_bh(&nf_h323_lock);
615 return NF_ACCEPT;
616
617 drop:
618 spin_unlock_bh(&nf_h323_lock);
619 nf_ct_helper_log(skb, ct, "cannot process H.245 message");
620 return NF_DROP;
621}
622
623static const struct nf_conntrack_expect_policy h245_exp_policy = {
624 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 ,
625 .timeout = 240,
626};
627
628static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
629 .name = "H.245",
630 .me = THIS_MODULE,
631 .tuple.src.l3num = AF_UNSPEC,
632 .tuple.dst.protonum = IPPROTO_UDP,
633 .help = h245_help,
634 .expect_policy = &h245_exp_policy,
635};
636
637int get_h225_addr(struct nf_conn *ct, unsigned char *data,
638 TransportAddress *taddr,
639 union nf_inet_addr *addr, __be16 *port)
640{
641 const unsigned char *p;
642 int len;
643
644 switch (taddr->choice) {
645 case eTransportAddress_ipAddress:
646 if (nf_ct_l3num(ct) != AF_INET)
647 return 0;
648 p = data + taddr->ipAddress.ip;
649 len = 4;
650 break;
651 case eTransportAddress_ip6Address:
652 if (nf_ct_l3num(ct) != AF_INET6)
653 return 0;
654 p = data + taddr->ip6Address.ip;
655 len = 16;
656 break;
657 default:
658 return 0;
659 }
660
661 memcpy(addr, p, len);
662 memset((void *)addr + len, 0, sizeof(*addr) - len);
663 memcpy(port, p + len, sizeof(__be16));
664
665 return 1;
666}
667
668static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
669 enum ip_conntrack_info ctinfo,
670 unsigned int protoff, unsigned char **data, int dataoff,
671 TransportAddress *taddr)
672{
673 int dir = CTINFO2DIR(ctinfo);
674 int ret = 0;
675 __be16 port;
676 union nf_inet_addr addr;
677 struct nf_conntrack_expect *exp;
678 typeof(nat_h245_hook) nat_h245;
679
680
681 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
682 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
683 port == 0)
684 return 0;
685
686
687 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
688 return -1;
689 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
690 &ct->tuplehash[!dir].tuple.src.u3,
691 &ct->tuplehash[!dir].tuple.dst.u3,
692 IPPROTO_TCP, NULL, &port);
693 exp->helper = &nf_conntrack_helper_h245;
694
695 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
696 &ct->tuplehash[!dir].tuple.dst.u3,
697 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
698 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
699 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
700 ct->status & IPS_NAT_MASK) {
701
702 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
703 port, exp);
704 } else {
705 if (nf_ct_expect_related(exp, 0) == 0) {
706 pr_debug("nf_ct_q931: expect H.245 ");
707 nf_ct_dump_tuple(&exp->tuple);
708 } else
709 ret = -1;
710 }
711
712 nf_ct_expect_put(exp);
713
714 return ret;
715}
716
717
718
719
720static int callforward_do_filter(struct net *net,
721 const union nf_inet_addr *src,
722 const union nf_inet_addr *dst,
723 u_int8_t family)
724{
725 int ret = 0;
726
727 switch (family) {
728 case AF_INET: {
729 struct flowi4 fl1, fl2;
730 struct rtable *rt1, *rt2;
731
732 memset(&fl1, 0, sizeof(fl1));
733 fl1.daddr = src->ip;
734
735 memset(&fl2, 0, sizeof(fl2));
736 fl2.daddr = dst->ip;
737 if (!nf_ip_route(net, (struct dst_entry **)&rt1,
738 flowi4_to_flowi(&fl1), false)) {
739 if (!nf_ip_route(net, (struct dst_entry **)&rt2,
740 flowi4_to_flowi(&fl2), false)) {
741 if (rt_nexthop(rt1, fl1.daddr) ==
742 rt_nexthop(rt2, fl2.daddr) &&
743 rt1->dst.dev == rt2->dst.dev)
744 ret = 1;
745 dst_release(&rt2->dst);
746 }
747 dst_release(&rt1->dst);
748 }
749 break;
750 }
751#if IS_ENABLED(CONFIG_IPV6)
752 case AF_INET6: {
753 struct rt6_info *rt1, *rt2;
754 struct flowi6 fl1, fl2;
755
756 memset(&fl1, 0, sizeof(fl1));
757 fl1.daddr = src->in6;
758
759 memset(&fl2, 0, sizeof(fl2));
760 fl2.daddr = dst->in6;
761 if (!nf_ip6_route(net, (struct dst_entry **)&rt1,
762 flowi6_to_flowi(&fl1), false)) {
763 if (!nf_ip6_route(net, (struct dst_entry **)&rt2,
764 flowi6_to_flowi(&fl2), false)) {
765 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
766 rt6_nexthop(rt2, &fl2.daddr)) &&
767 rt1->dst.dev == rt2->dst.dev)
768 ret = 1;
769 dst_release(&rt2->dst);
770 }
771 dst_release(&rt1->dst);
772 }
773 break;
774 }
775#endif
776 }
777 return ret;
778
779}
780
781static int expect_callforwarding(struct sk_buff *skb,
782 struct nf_conn *ct,
783 enum ip_conntrack_info ctinfo,
784 unsigned int protoff,
785 unsigned char **data, int dataoff,
786 TransportAddress *taddr)
787{
788 int dir = CTINFO2DIR(ctinfo);
789 int ret = 0;
790 __be16 port;
791 union nf_inet_addr addr;
792 struct nf_conntrack_expect *exp;
793 struct net *net = nf_ct_net(ct);
794 typeof(nat_callforwarding_hook) nat_callforwarding;
795
796
797 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
798 return 0;
799
800
801
802
803 if (callforward_filter &&
804 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
805 nf_ct_l3num(ct))) {
806 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
807 return 0;
808 }
809
810
811 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
812 return -1;
813 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
814 &ct->tuplehash[!dir].tuple.src.u3, &addr,
815 IPPROTO_TCP, NULL, &port);
816 exp->helper = nf_conntrack_helper_q931;
817
818 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
819 &ct->tuplehash[!dir].tuple.dst.u3,
820 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
821 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
822 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
823 ct->status & IPS_NAT_MASK) {
824
825 ret = nat_callforwarding(skb, ct, ctinfo,
826 protoff, data, dataoff,
827 taddr, port, exp);
828 } else {
829 if (nf_ct_expect_related(exp, 0) == 0) {
830 pr_debug("nf_ct_q931: expect Call Forwarding ");
831 nf_ct_dump_tuple(&exp->tuple);
832 } else
833 ret = -1;
834 }
835
836 nf_ct_expect_put(exp);
837
838 return ret;
839}
840
841static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
842 enum ip_conntrack_info ctinfo,
843 unsigned int protoff,
844 unsigned char **data, int dataoff,
845 Setup_UUIE *setup)
846{
847 int dir = CTINFO2DIR(ctinfo);
848 int ret;
849 int i;
850 __be16 port;
851 union nf_inet_addr addr;
852 typeof(set_h225_addr_hook) set_h225_addr;
853
854 pr_debug("nf_ct_q931: Setup\n");
855
856 if (setup->options & eSetup_UUIE_h245Address) {
857 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
858 &setup->h245Address);
859 if (ret < 0)
860 return -1;
861 }
862
863 set_h225_addr = rcu_dereference(set_h225_addr_hook);
864 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
865 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
866 ct->status & IPS_NAT_MASK &&
867 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
868 &addr, &port) &&
869 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
870 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
871 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
872 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
873 ret = set_h225_addr(skb, protoff, data, dataoff,
874 &setup->destCallSignalAddress,
875 &ct->tuplehash[!dir].tuple.src.u3,
876 ct->tuplehash[!dir].tuple.src.u.tcp.port);
877 if (ret < 0)
878 return -1;
879 }
880
881 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
882 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
883 ct->status & IPS_NAT_MASK &&
884 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
885 &addr, &port) &&
886 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
887 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
888 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
889 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
890 ret = set_h225_addr(skb, protoff, data, dataoff,
891 &setup->sourceCallSignalAddress,
892 &ct->tuplehash[!dir].tuple.dst.u3,
893 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
894 if (ret < 0)
895 return -1;
896 }
897
898 if (setup->options & eSetup_UUIE_fastStart) {
899 for (i = 0; i < setup->fastStart.count; i++) {
900 ret = process_olc(skb, ct, ctinfo,
901 protoff, data, dataoff,
902 &setup->fastStart.item[i]);
903 if (ret < 0)
904 return -1;
905 }
906 }
907
908 return 0;
909}
910
911static int process_callproceeding(struct sk_buff *skb,
912 struct nf_conn *ct,
913 enum ip_conntrack_info ctinfo,
914 unsigned int protoff,
915 unsigned char **data, int dataoff,
916 CallProceeding_UUIE *callproc)
917{
918 int ret;
919 int i;
920
921 pr_debug("nf_ct_q931: CallProceeding\n");
922
923 if (callproc->options & eCallProceeding_UUIE_h245Address) {
924 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
925 &callproc->h245Address);
926 if (ret < 0)
927 return -1;
928 }
929
930 if (callproc->options & eCallProceeding_UUIE_fastStart) {
931 for (i = 0; i < callproc->fastStart.count; i++) {
932 ret = process_olc(skb, ct, ctinfo,
933 protoff, data, dataoff,
934 &callproc->fastStart.item[i]);
935 if (ret < 0)
936 return -1;
937 }
938 }
939
940 return 0;
941}
942
943static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
944 enum ip_conntrack_info ctinfo,
945 unsigned int protoff,
946 unsigned char **data, int dataoff,
947 Connect_UUIE *connect)
948{
949 int ret;
950 int i;
951
952 pr_debug("nf_ct_q931: Connect\n");
953
954 if (connect->options & eConnect_UUIE_h245Address) {
955 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
956 &connect->h245Address);
957 if (ret < 0)
958 return -1;
959 }
960
961 if (connect->options & eConnect_UUIE_fastStart) {
962 for (i = 0; i < connect->fastStart.count; i++) {
963 ret = process_olc(skb, ct, ctinfo,
964 protoff, data, dataoff,
965 &connect->fastStart.item[i]);
966 if (ret < 0)
967 return -1;
968 }
969 }
970
971 return 0;
972}
973
974static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
975 enum ip_conntrack_info ctinfo,
976 unsigned int protoff,
977 unsigned char **data, int dataoff,
978 Alerting_UUIE *alert)
979{
980 int ret;
981 int i;
982
983 pr_debug("nf_ct_q931: Alerting\n");
984
985 if (alert->options & eAlerting_UUIE_h245Address) {
986 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
987 &alert->h245Address);
988 if (ret < 0)
989 return -1;
990 }
991
992 if (alert->options & eAlerting_UUIE_fastStart) {
993 for (i = 0; i < alert->fastStart.count; i++) {
994 ret = process_olc(skb, ct, ctinfo,
995 protoff, data, dataoff,
996 &alert->fastStart.item[i]);
997 if (ret < 0)
998 return -1;
999 }
1000 }
1001
1002 return 0;
1003}
1004
1005static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1006 enum ip_conntrack_info ctinfo,
1007 unsigned int protoff,
1008 unsigned char **data, int dataoff,
1009 Facility_UUIE *facility)
1010{
1011 int ret;
1012 int i;
1013
1014 pr_debug("nf_ct_q931: Facility\n");
1015
1016 if (facility->reason.choice == eFacilityReason_callForwarded) {
1017 if (facility->options & eFacility_UUIE_alternativeAddress)
1018 return expect_callforwarding(skb, ct, ctinfo,
1019 protoff, data, dataoff,
1020 &facility->
1021 alternativeAddress);
1022 return 0;
1023 }
1024
1025 if (facility->options & eFacility_UUIE_h245Address) {
1026 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1027 &facility->h245Address);
1028 if (ret < 0)
1029 return -1;
1030 }
1031
1032 if (facility->options & eFacility_UUIE_fastStart) {
1033 for (i = 0; i < facility->fastStart.count; i++) {
1034 ret = process_olc(skb, ct, ctinfo,
1035 protoff, data, dataoff,
1036 &facility->fastStart.item[i]);
1037 if (ret < 0)
1038 return -1;
1039 }
1040 }
1041
1042 return 0;
1043}
1044
1045static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1046 enum ip_conntrack_info ctinfo,
1047 unsigned int protoff,
1048 unsigned char **data, int dataoff,
1049 Progress_UUIE *progress)
1050{
1051 int ret;
1052 int i;
1053
1054 pr_debug("nf_ct_q931: Progress\n");
1055
1056 if (progress->options & eProgress_UUIE_h245Address) {
1057 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1058 &progress->h245Address);
1059 if (ret < 0)
1060 return -1;
1061 }
1062
1063 if (progress->options & eProgress_UUIE_fastStart) {
1064 for (i = 0; i < progress->fastStart.count; i++) {
1065 ret = process_olc(skb, ct, ctinfo,
1066 protoff, data, dataoff,
1067 &progress->fastStart.item[i]);
1068 if (ret < 0)
1069 return -1;
1070 }
1071 }
1072
1073 return 0;
1074}
1075
1076static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1077 enum ip_conntrack_info ctinfo,
1078 unsigned int protoff, unsigned char **data, int dataoff,
1079 Q931 *q931)
1080{
1081 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1082 int i;
1083 int ret = 0;
1084
1085 switch (pdu->h323_message_body.choice) {
1086 case eH323_UU_PDU_h323_message_body_setup:
1087 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1088 &pdu->h323_message_body.setup);
1089 break;
1090 case eH323_UU_PDU_h323_message_body_callProceeding:
1091 ret = process_callproceeding(skb, ct, ctinfo,
1092 protoff, data, dataoff,
1093 &pdu->h323_message_body.
1094 callProceeding);
1095 break;
1096 case eH323_UU_PDU_h323_message_body_connect:
1097 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1098 &pdu->h323_message_body.connect);
1099 break;
1100 case eH323_UU_PDU_h323_message_body_alerting:
1101 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1102 &pdu->h323_message_body.alerting);
1103 break;
1104 case eH323_UU_PDU_h323_message_body_facility:
1105 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1106 &pdu->h323_message_body.facility);
1107 break;
1108 case eH323_UU_PDU_h323_message_body_progress:
1109 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1110 &pdu->h323_message_body.progress);
1111 break;
1112 default:
1113 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1114 pdu->h323_message_body.choice);
1115 break;
1116 }
1117
1118 if (ret < 0)
1119 return -1;
1120
1121 if (pdu->options & eH323_UU_PDU_h245Control) {
1122 for (i = 0; i < pdu->h245Control.count; i++) {
1123 ret = process_h245(skb, ct, ctinfo,
1124 protoff, data, dataoff,
1125 &pdu->h245Control.item[i]);
1126 if (ret < 0)
1127 return -1;
1128 }
1129 }
1130
1131 return 0;
1132}
1133
1134static int q931_help(struct sk_buff *skb, unsigned int protoff,
1135 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1136{
1137 static Q931 q931;
1138 unsigned char *data = NULL;
1139 int datalen;
1140 int dataoff;
1141 int ret;
1142
1143
1144 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1145 return NF_ACCEPT;
1146
1147 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1148
1149 spin_lock_bh(&nf_h323_lock);
1150
1151
1152 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1153 &data, &datalen, &dataoff)) {
1154 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1155 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1156
1157
1158 ret = DecodeQ931(data, datalen, &q931);
1159 if (ret < 0) {
1160 pr_debug("nf_ct_q931: decoding error: %s\n",
1161 ret == H323_ERROR_BOUND ?
1162 "out of bound" : "out of range");
1163
1164 break;
1165 }
1166
1167
1168 if (process_q931(skb, ct, ctinfo, protoff,
1169 &data, dataoff, &q931) < 0)
1170 goto drop;
1171 }
1172
1173 spin_unlock_bh(&nf_h323_lock);
1174 return NF_ACCEPT;
1175
1176 drop:
1177 spin_unlock_bh(&nf_h323_lock);
1178 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1179 return NF_DROP;
1180}
1181
1182static const struct nf_conntrack_expect_policy q931_exp_policy = {
1183
1184 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1185 .timeout = 240,
1186};
1187
1188static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1189 {
1190 .name = "Q.931",
1191 .me = THIS_MODULE,
1192 .tuple.src.l3num = AF_INET,
1193 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1194 .tuple.dst.protonum = IPPROTO_TCP,
1195 .help = q931_help,
1196 .expect_policy = &q931_exp_policy,
1197 },
1198 {
1199 .name = "Q.931",
1200 .me = THIS_MODULE,
1201 .tuple.src.l3num = AF_INET6,
1202 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1203 .tuple.dst.protonum = IPPROTO_TCP,
1204 .help = q931_help,
1205 .expect_policy = &q931_exp_policy,
1206 },
1207};
1208
1209static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1210 int *datalen)
1211{
1212 const struct udphdr *uh;
1213 struct udphdr _uh;
1214 int dataoff;
1215
1216 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1217 if (uh == NULL)
1218 return NULL;
1219 dataoff = protoff + sizeof(_uh);
1220 if (dataoff >= skb->len)
1221 return NULL;
1222 *datalen = skb->len - dataoff;
1223 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1224}
1225
1226static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1227 union nf_inet_addr *addr,
1228 __be16 port)
1229{
1230 struct net *net = nf_ct_net(ct);
1231 struct nf_conntrack_expect *exp;
1232 struct nf_conntrack_tuple tuple;
1233
1234 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1235 tuple.src.u.tcp.port = 0;
1236 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1237 tuple.dst.u.tcp.port = port;
1238 tuple.dst.protonum = IPPROTO_TCP;
1239
1240 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1241 if (exp && exp->master == ct)
1242 return exp;
1243 return NULL;
1244}
1245
1246static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1247 enum ip_conntrack_info ctinfo,
1248 unsigned int protoff, unsigned char **data,
1249 TransportAddress *taddr, int count)
1250{
1251 struct nf_ct_h323_master *info = nfct_help_data(ct);
1252 int dir = CTINFO2DIR(ctinfo);
1253 int ret = 0;
1254 int i;
1255 __be16 port;
1256 union nf_inet_addr addr;
1257 struct nf_conntrack_expect *exp;
1258 typeof(nat_q931_hook) nat_q931;
1259
1260
1261 for (i = 0; i < count; i++) {
1262 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1263 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1264 sizeof(addr)) == 0 && port != 0)
1265 break;
1266 }
1267
1268 if (i >= count)
1269 return 0;
1270
1271
1272 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1273 return -1;
1274 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1275 gkrouted_only ?
1276 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1277 &ct->tuplehash[!dir].tuple.dst.u3,
1278 IPPROTO_TCP, NULL, &port);
1279 exp->helper = nf_conntrack_helper_q931;
1280 exp->flags = NF_CT_EXPECT_PERMANENT;
1281
1282 nat_q931 = rcu_dereference(nat_q931_hook);
1283 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1284 ct->status & IPS_NAT_MASK) {
1285 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1286 taddr, i, port, exp);
1287 } else {
1288 if (nf_ct_expect_related(exp, 0) == 0) {
1289 pr_debug("nf_ct_ras: expect Q.931 ");
1290 nf_ct_dump_tuple(&exp->tuple);
1291
1292
1293 info->sig_port[dir] = port;
1294 } else
1295 ret = -1;
1296 }
1297
1298 nf_ct_expect_put(exp);
1299
1300 return ret;
1301}
1302
1303static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1304 enum ip_conntrack_info ctinfo,
1305 unsigned int protoff,
1306 unsigned char **data, GatekeeperRequest *grq)
1307{
1308 typeof(set_ras_addr_hook) set_ras_addr;
1309
1310 pr_debug("nf_ct_ras: GRQ\n");
1311
1312 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1313 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1314 ct->status & IPS_NAT_MASK)
1315 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1316 &grq->rasAddress, 1);
1317 return 0;
1318}
1319
1320static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1321 enum ip_conntrack_info ctinfo,
1322 unsigned int protoff,
1323 unsigned char **data, GatekeeperConfirm *gcf)
1324{
1325 int dir = CTINFO2DIR(ctinfo);
1326 int ret = 0;
1327 __be16 port;
1328 union nf_inet_addr addr;
1329 struct nf_conntrack_expect *exp;
1330
1331 pr_debug("nf_ct_ras: GCF\n");
1332
1333 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1334 return 0;
1335
1336
1337 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1338 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1339 return 0;
1340
1341
1342 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1343 return 0;
1344
1345
1346 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1347 return -1;
1348 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1349 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1350 IPPROTO_UDP, NULL, &port);
1351 exp->helper = nf_conntrack_helper_ras;
1352
1353 if (nf_ct_expect_related(exp, 0) == 0) {
1354 pr_debug("nf_ct_ras: expect RAS ");
1355 nf_ct_dump_tuple(&exp->tuple);
1356 } else
1357 ret = -1;
1358
1359 nf_ct_expect_put(exp);
1360
1361 return ret;
1362}
1363
1364static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1365 enum ip_conntrack_info ctinfo,
1366 unsigned int protoff,
1367 unsigned char **data, RegistrationRequest *rrq)
1368{
1369 struct nf_ct_h323_master *info = nfct_help_data(ct);
1370 int ret;
1371 typeof(set_ras_addr_hook) set_ras_addr;
1372
1373 pr_debug("nf_ct_ras: RRQ\n");
1374
1375 ret = expect_q931(skb, ct, ctinfo, protoff, data,
1376 rrq->callSignalAddress.item,
1377 rrq->callSignalAddress.count);
1378 if (ret < 0)
1379 return -1;
1380
1381 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1382 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1383 ct->status & IPS_NAT_MASK) {
1384 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1385 rrq->rasAddress.item,
1386 rrq->rasAddress.count);
1387 if (ret < 0)
1388 return -1;
1389 }
1390
1391 if (rrq->options & eRegistrationRequest_timeToLive) {
1392 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1393 info->timeout = rrq->timeToLive;
1394 } else
1395 info->timeout = default_rrq_ttl;
1396
1397 return 0;
1398}
1399
1400static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1401 enum ip_conntrack_info ctinfo,
1402 unsigned int protoff,
1403 unsigned char **data, RegistrationConfirm *rcf)
1404{
1405 struct nf_ct_h323_master *info = nfct_help_data(ct);
1406 int dir = CTINFO2DIR(ctinfo);
1407 int ret;
1408 struct nf_conntrack_expect *exp;
1409 typeof(set_sig_addr_hook) set_sig_addr;
1410
1411 pr_debug("nf_ct_ras: RCF\n");
1412
1413 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1414 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1415 ct->status & IPS_NAT_MASK) {
1416 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1417 rcf->callSignalAddress.item,
1418 rcf->callSignalAddress.count);
1419 if (ret < 0)
1420 return -1;
1421 }
1422
1423 if (rcf->options & eRegistrationConfirm_timeToLive) {
1424 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1425 info->timeout = rcf->timeToLive;
1426 }
1427
1428 if (info->timeout > 0) {
1429 pr_debug("nf_ct_ras: set RAS connection timeout to "
1430 "%u seconds\n", info->timeout);
1431 nf_ct_refresh(ct, skb, info->timeout * HZ);
1432
1433
1434 spin_lock_bh(&nf_conntrack_expect_lock);
1435 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1436 info->sig_port[!dir]);
1437 if (exp) {
1438 pr_debug("nf_ct_ras: set Q.931 expect "
1439 "timeout to %u seconds for",
1440 info->timeout);
1441 nf_ct_dump_tuple(&exp->tuple);
1442 mod_timer_pending(&exp->timeout,
1443 jiffies + info->timeout * HZ);
1444 }
1445 spin_unlock_bh(&nf_conntrack_expect_lock);
1446 }
1447
1448 return 0;
1449}
1450
1451static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1452 enum ip_conntrack_info ctinfo,
1453 unsigned int protoff,
1454 unsigned char **data, UnregistrationRequest *urq)
1455{
1456 struct nf_ct_h323_master *info = nfct_help_data(ct);
1457 int dir = CTINFO2DIR(ctinfo);
1458 int ret;
1459 typeof(set_sig_addr_hook) set_sig_addr;
1460
1461 pr_debug("nf_ct_ras: URQ\n");
1462
1463 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1464 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1465 ct->status & IPS_NAT_MASK) {
1466 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1467 urq->callSignalAddress.item,
1468 urq->callSignalAddress.count);
1469 if (ret < 0)
1470 return -1;
1471 }
1472
1473
1474 nf_ct_remove_expectations(ct);
1475 info->sig_port[dir] = 0;
1476 info->sig_port[!dir] = 0;
1477
1478
1479 nf_ct_refresh(ct, skb, 30 * HZ);
1480
1481 return 0;
1482}
1483
1484static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1485 enum ip_conntrack_info ctinfo,
1486 unsigned int protoff,
1487 unsigned char **data, AdmissionRequest *arq)
1488{
1489 const struct nf_ct_h323_master *info = nfct_help_data(ct);
1490 int dir = CTINFO2DIR(ctinfo);
1491 __be16 port;
1492 union nf_inet_addr addr;
1493 typeof(set_h225_addr_hook) set_h225_addr;
1494
1495 pr_debug("nf_ct_ras: ARQ\n");
1496
1497 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1498 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1499 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1500 &addr, &port) &&
1501 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1502 port == info->sig_port[dir] &&
1503 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1504 set_h225_addr && ct->status & IPS_NAT_MASK) {
1505
1506 return set_h225_addr(skb, protoff, data, 0,
1507 &arq->destCallSignalAddress,
1508 &ct->tuplehash[!dir].tuple.dst.u3,
1509 info->sig_port[!dir]);
1510 }
1511
1512 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1513 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1514 &addr, &port) &&
1515 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1516 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1517 ct->status & IPS_NAT_MASK) {
1518
1519 return set_h225_addr(skb, protoff, data, 0,
1520 &arq->srcCallSignalAddress,
1521 &ct->tuplehash[!dir].tuple.dst.u3,
1522 port);
1523 }
1524
1525 return 0;
1526}
1527
1528static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1529 enum ip_conntrack_info ctinfo,
1530 unsigned int protoff,
1531 unsigned char **data, AdmissionConfirm *acf)
1532{
1533 int dir = CTINFO2DIR(ctinfo);
1534 int ret = 0;
1535 __be16 port;
1536 union nf_inet_addr addr;
1537 struct nf_conntrack_expect *exp;
1538 typeof(set_sig_addr_hook) set_sig_addr;
1539
1540 pr_debug("nf_ct_ras: ACF\n");
1541
1542 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1543 &addr, &port))
1544 return 0;
1545
1546 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1547
1548 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1549 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1550 ct->status & IPS_NAT_MASK)
1551 return set_sig_addr(skb, ct, ctinfo, protoff, data,
1552 &acf->destCallSignalAddress, 1);
1553 return 0;
1554 }
1555
1556
1557 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1558 return -1;
1559 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1560 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1561 IPPROTO_TCP, NULL, &port);
1562 exp->flags = NF_CT_EXPECT_PERMANENT;
1563 exp->helper = nf_conntrack_helper_q931;
1564
1565 if (nf_ct_expect_related(exp, 0) == 0) {
1566 pr_debug("nf_ct_ras: expect Q.931 ");
1567 nf_ct_dump_tuple(&exp->tuple);
1568 } else
1569 ret = -1;
1570
1571 nf_ct_expect_put(exp);
1572
1573 return ret;
1574}
1575
1576static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1577 enum ip_conntrack_info ctinfo,
1578 unsigned int protoff,
1579 unsigned char **data, LocationRequest *lrq)
1580{
1581 typeof(set_ras_addr_hook) set_ras_addr;
1582
1583 pr_debug("nf_ct_ras: LRQ\n");
1584
1585 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1586 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1587 ct->status & IPS_NAT_MASK)
1588 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1589 &lrq->replyAddress, 1);
1590 return 0;
1591}
1592
1593static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1594 enum ip_conntrack_info ctinfo,
1595 unsigned int protoff,
1596 unsigned char **data, LocationConfirm *lcf)
1597{
1598 int dir = CTINFO2DIR(ctinfo);
1599 int ret = 0;
1600 __be16 port;
1601 union nf_inet_addr addr;
1602 struct nf_conntrack_expect *exp;
1603
1604 pr_debug("nf_ct_ras: LCF\n");
1605
1606 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1607 &addr, &port))
1608 return 0;
1609
1610
1611 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1612 return -1;
1613 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1614 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1615 IPPROTO_TCP, NULL, &port);
1616 exp->flags = NF_CT_EXPECT_PERMANENT;
1617 exp->helper = nf_conntrack_helper_q931;
1618
1619 if (nf_ct_expect_related(exp, 0) == 0) {
1620 pr_debug("nf_ct_ras: expect Q.931 ");
1621 nf_ct_dump_tuple(&exp->tuple);
1622 } else
1623 ret = -1;
1624
1625 nf_ct_expect_put(exp);
1626
1627
1628
1629 return ret;
1630}
1631
1632static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1633 enum ip_conntrack_info ctinfo,
1634 unsigned int protoff,
1635 unsigned char **data, InfoRequestResponse *irr)
1636{
1637 int ret;
1638 typeof(set_ras_addr_hook) set_ras_addr;
1639 typeof(set_sig_addr_hook) set_sig_addr;
1640
1641 pr_debug("nf_ct_ras: IRR\n");
1642
1643 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1644 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1645 ct->status & IPS_NAT_MASK) {
1646 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1647 &irr->rasAddress, 1);
1648 if (ret < 0)
1649 return -1;
1650 }
1651
1652 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1653 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1654 ct->status & IPS_NAT_MASK) {
1655 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1656 irr->callSignalAddress.item,
1657 irr->callSignalAddress.count);
1658 if (ret < 0)
1659 return -1;
1660 }
1661
1662 return 0;
1663}
1664
1665static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1666 enum ip_conntrack_info ctinfo,
1667 unsigned int protoff,
1668 unsigned char **data, RasMessage *ras)
1669{
1670 switch (ras->choice) {
1671 case eRasMessage_gatekeeperRequest:
1672 return process_grq(skb, ct, ctinfo, protoff, data,
1673 &ras->gatekeeperRequest);
1674 case eRasMessage_gatekeeperConfirm:
1675 return process_gcf(skb, ct, ctinfo, protoff, data,
1676 &ras->gatekeeperConfirm);
1677 case eRasMessage_registrationRequest:
1678 return process_rrq(skb, ct, ctinfo, protoff, data,
1679 &ras->registrationRequest);
1680 case eRasMessage_registrationConfirm:
1681 return process_rcf(skb, ct, ctinfo, protoff, data,
1682 &ras->registrationConfirm);
1683 case eRasMessage_unregistrationRequest:
1684 return process_urq(skb, ct, ctinfo, protoff, data,
1685 &ras->unregistrationRequest);
1686 case eRasMessage_admissionRequest:
1687 return process_arq(skb, ct, ctinfo, protoff, data,
1688 &ras->admissionRequest);
1689 case eRasMessage_admissionConfirm:
1690 return process_acf(skb, ct, ctinfo, protoff, data,
1691 &ras->admissionConfirm);
1692 case eRasMessage_locationRequest:
1693 return process_lrq(skb, ct, ctinfo, protoff, data,
1694 &ras->locationRequest);
1695 case eRasMessage_locationConfirm:
1696 return process_lcf(skb, ct, ctinfo, protoff, data,
1697 &ras->locationConfirm);
1698 case eRasMessage_infoRequestResponse:
1699 return process_irr(skb, ct, ctinfo, protoff, data,
1700 &ras->infoRequestResponse);
1701 default:
1702 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1703 break;
1704 }
1705
1706 return 0;
1707}
1708
1709static int ras_help(struct sk_buff *skb, unsigned int protoff,
1710 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1711{
1712 static RasMessage ras;
1713 unsigned char *data;
1714 int datalen = 0;
1715 int ret;
1716
1717 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1718
1719 spin_lock_bh(&nf_h323_lock);
1720
1721
1722 data = get_udp_data(skb, protoff, &datalen);
1723 if (data == NULL)
1724 goto accept;
1725 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1726 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1727
1728
1729 ret = DecodeRasMessage(data, datalen, &ras);
1730 if (ret < 0) {
1731 pr_debug("nf_ct_ras: decoding error: %s\n",
1732 ret == H323_ERROR_BOUND ?
1733 "out of bound" : "out of range");
1734 goto accept;
1735 }
1736
1737
1738 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1739 goto drop;
1740
1741 accept:
1742 spin_unlock_bh(&nf_h323_lock);
1743 return NF_ACCEPT;
1744
1745 drop:
1746 spin_unlock_bh(&nf_h323_lock);
1747 nf_ct_helper_log(skb, ct, "cannot process RAS message");
1748 return NF_DROP;
1749}
1750
1751static const struct nf_conntrack_expect_policy ras_exp_policy = {
1752 .max_expected = 32,
1753 .timeout = 240,
1754};
1755
1756static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1757 {
1758 .name = "RAS",
1759 .me = THIS_MODULE,
1760 .tuple.src.l3num = AF_INET,
1761 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1762 .tuple.dst.protonum = IPPROTO_UDP,
1763 .help = ras_help,
1764 .expect_policy = &ras_exp_policy,
1765 },
1766 {
1767 .name = "RAS",
1768 .me = THIS_MODULE,
1769 .tuple.src.l3num = AF_INET6,
1770 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1771 .tuple.dst.protonum = IPPROTO_UDP,
1772 .help = ras_help,
1773 .expect_policy = &ras_exp_policy,
1774 },
1775};
1776
1777static int __init h323_helper_init(void)
1778{
1779 int ret;
1780
1781 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1782 if (ret < 0)
1783 return ret;
1784 ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1785 ARRAY_SIZE(nf_conntrack_helper_q931));
1786 if (ret < 0)
1787 goto err1;
1788 ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1789 ARRAY_SIZE(nf_conntrack_helper_ras));
1790 if (ret < 0)
1791 goto err2;
1792
1793 return 0;
1794err2:
1795 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1796 ARRAY_SIZE(nf_conntrack_helper_q931));
1797err1:
1798 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1799 return ret;
1800}
1801
1802static void __exit h323_helper_exit(void)
1803{
1804 nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1805 ARRAY_SIZE(nf_conntrack_helper_ras));
1806 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1807 ARRAY_SIZE(nf_conntrack_helper_q931));
1808 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1809}
1810
1811static void __exit nf_conntrack_h323_fini(void)
1812{
1813 h323_helper_exit();
1814 kfree(h323_buffer);
1815 pr_debug("nf_ct_h323: fini\n");
1816}
1817
1818static int __init nf_conntrack_h323_init(void)
1819{
1820 int ret;
1821
1822 NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1823
1824 h323_buffer = kmalloc(65536, GFP_KERNEL);
1825 if (!h323_buffer)
1826 return -ENOMEM;
1827 ret = h323_helper_init();
1828 if (ret < 0)
1829 goto err1;
1830 pr_debug("nf_ct_h323: init success\n");
1831 return 0;
1832err1:
1833 kfree(h323_buffer);
1834 return ret;
1835}
1836
1837module_init(nf_conntrack_h323_init);
1838module_exit(nf_conntrack_h323_fini);
1839
1840EXPORT_SYMBOL_GPL(get_h225_addr);
1841EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1842EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1843EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1844EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1845EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1846EXPORT_SYMBOL_GPL(nat_t120_hook);
1847EXPORT_SYMBOL_GPL(nat_h245_hook);
1848EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1849EXPORT_SYMBOL_GPL(nat_q931_hook);
1850
1851MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1852MODULE_DESCRIPTION("H.323 connection tracking helper");
1853MODULE_LICENSE("GPL");
1854MODULE_ALIAS("ip_conntrack_h323");
1855MODULE_ALIAS_NFCT_HELPER("RAS");
1856MODULE_ALIAS_NFCT_HELPER("Q.931");
1857MODULE_ALIAS_NFCT_HELPER("H.245");
1858
