2 * H.323 connection tracking helper
4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * This source code is licensed under General Public License version 2.
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
11 * For more information, please see http://nath323.sourceforge.net/
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/ctype.h>
17 #include <linux/inet.h>
20 #include <linux/udp.h>
21 #include <linux/tcp.h>
22 #include <linux/skbuff.h>
23 #include <net/route.h>
24 #include <net/ip6_route.h>
26 #include <net/netfilter/nf_conntrack.h>
27 #include <net/netfilter/nf_conntrack_core.h>
28 #include <net/netfilter/nf_conntrack_tuple.h>
29 #include <net/netfilter/nf_conntrack_expect.h>
30 #include <net/netfilter/nf_conntrack_ecache.h>
31 #include <net/netfilter/nf_conntrack_helper.h>
32 #include <linux/netfilter/nf_conntrack_h323.h>
37 #define DEBUGP(format, args...)
41 static unsigned int default_rrq_ttl __read_mostly = 300;
42 module_param(default_rrq_ttl, uint, 0600);
43 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
45 static int gkrouted_only __read_mostly = 1;
46 module_param(gkrouted_only, int, 0600);
47 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
49 static int callforward_filter __read_mostly = 1;
50 module_param(callforward_filter, bool, 0600);
51 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
52 "if both endpoints are on different sides "
53 "(determined by routing information)");
56 int (*set_h245_addr_hook) (struct sk_buff **pskb,
57 unsigned char **data, int dataoff,
58 H245_TransportAddress *taddr,
59 union nf_conntrack_address *addr, __be16 port)
61 int (*set_h225_addr_hook) (struct sk_buff **pskb,
62 unsigned char **data, int dataoff,
63 TransportAddress *taddr,
64 union nf_conntrack_address *addr, __be16 port)
66 int (*set_sig_addr_hook) (struct sk_buff **pskb,
68 enum ip_conntrack_info ctinfo,
70 TransportAddress *taddr, int count) __read_mostly;
71 int (*set_ras_addr_hook) (struct sk_buff **pskb,
73 enum ip_conntrack_info ctinfo,
75 TransportAddress *taddr, int count) __read_mostly;
76 int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb,
78 enum ip_conntrack_info ctinfo,
79 unsigned char **data, int dataoff,
80 H245_TransportAddress *taddr,
81 __be16 port, __be16 rtp_port,
82 struct nf_conntrack_expect *rtp_exp,
83 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
84 int (*nat_t120_hook) (struct sk_buff **pskb,
86 enum ip_conntrack_info ctinfo,
87 unsigned char **data, int dataoff,
88 H245_TransportAddress *taddr, __be16 port,
89 struct nf_conntrack_expect *exp) __read_mostly;
90 int (*nat_h245_hook) (struct sk_buff **pskb,
92 enum ip_conntrack_info ctinfo,
93 unsigned char **data, int dataoff,
94 TransportAddress *taddr, __be16 port,
95 struct nf_conntrack_expect *exp) __read_mostly;
96 int (*nat_callforwarding_hook) (struct sk_buff **pskb,
98 enum ip_conntrack_info ctinfo,
99 unsigned char **data, int dataoff,
100 TransportAddress *taddr, __be16 port,
101 struct nf_conntrack_expect *exp) __read_mostly;
102 int (*nat_q931_hook) (struct sk_buff **pskb,
104 enum ip_conntrack_info ctinfo,
105 unsigned char **data, TransportAddress *taddr, int idx,
106 __be16 port, struct nf_conntrack_expect *exp)
109 static DEFINE_SPINLOCK(nf_h323_lock);
110 static char *h323_buffer;
112 static struct nf_conntrack_helper nf_conntrack_helper_h245;
113 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
114 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
116 /****************************************************************************/
117 static int get_tpkt_data(struct sk_buff **pskb, unsigned int protoff,
118 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
119 unsigned char **data, int *datalen, int *dataoff)
121 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
122 int dir = CTINFO2DIR(ctinfo);
123 struct tcphdr _tcph, *th;
131 th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph);
135 /* Get TCP data offset */
136 tcpdataoff = protoff + th->doff * 4;
138 /* Get TCP data length */
139 tcpdatalen = (*pskb)->len - tcpdataoff;
140 if (tcpdatalen <= 0) /* No TCP data */
143 if (*data == NULL) { /* first TPKT */
144 /* Get first TPKT pointer */
145 tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen,
147 BUG_ON(tpkt == NULL);
149 /* Validate TPKT identifier */
150 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
151 /* Netmeeting sends TPKT header and data separately */
152 if (info->tpkt_len[dir] > 0) {
153 DEBUGP("nf_ct_h323: previous packet "
154 "indicated separate TPKT data of %hu "
155 "bytes\n", info->tpkt_len[dir]);
156 if (info->tpkt_len[dir] <= tcpdatalen) {
157 /* Yes, there was a TPKT header
160 *datalen = info->tpkt_len[dir];
165 /* Fragmented TPKT */
167 printk("nf_ct_h323: "
168 "fragmented TPKT\n");
172 /* It is not even a TPKT */
176 } else { /* Next TPKT */
177 tpktoff = *dataoff + *datalen;
178 tcpdatalen -= tpktoff;
179 if (tcpdatalen <= 4) /* No more TPKT */
181 tpkt = *data + *datalen;
183 /* Validate TPKT identifier */
184 if (tpkt[0] != 0x03 || tpkt[1] != 0)
188 /* Validate TPKT length */
189 tpktlen = tpkt[2] * 256 + tpkt[3];
192 if (tpktlen > tcpdatalen) {
193 if (tcpdatalen == 4) { /* Separate TPKT header */
194 /* Netmeeting sends TPKT header and data separately */
195 DEBUGP("nf_ct_h323: separate TPKT header indicates "
196 "there will be TPKT data of %hu bytes\n",
198 info->tpkt_len[dir] = tpktlen - 4;
203 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
207 /* This is the encapsulated data */
209 *datalen = tpktlen - 4;
210 *dataoff = tpktoff + 4;
213 /* Clear TPKT length */
214 info->tpkt_len[dir] = 0;
218 info->tpkt_len[dir] = 0;
222 /****************************************************************************/
223 static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
224 H245_TransportAddress *taddr,
225 union nf_conntrack_address *addr, __be16 *port)
228 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
231 if (taddr->choice != eH245_TransportAddress_unicastAddress)
234 switch (taddr->unicastAddress.choice) {
235 case eUnicastAddress_iPAddress:
236 if (family != AF_INET)
238 p = data + taddr->unicastAddress.iPAddress.network;
241 case eUnicastAddress_iP6Address:
242 if (family != AF_INET6)
244 p = data + taddr->unicastAddress.iP6Address.network;
251 memcpy(addr, p, len);
252 memset((void *)addr + len, 0, sizeof(*addr) - len);
253 memcpy(port, p + len, sizeof(__be16));
258 /****************************************************************************/
259 static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
260 enum ip_conntrack_info ctinfo,
261 unsigned char **data, int dataoff,
262 H245_TransportAddress *taddr)
264 int dir = CTINFO2DIR(ctinfo);
267 __be16 rtp_port, rtcp_port;
268 union nf_conntrack_address addr;
269 struct nf_conntrack_expect *rtp_exp;
270 struct nf_conntrack_expect *rtcp_exp;
271 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
273 /* Read RTP or RTCP address */
274 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
275 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
279 /* RTP port is even */
282 rtcp_port = htons(ntohs(port) + 1);
284 /* Create expect for RTP */
285 if ((rtp_exp = nf_conntrack_expect_alloc(ct)) == NULL)
287 nf_conntrack_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
288 &ct->tuplehash[!dir].tuple.src.u3,
289 &ct->tuplehash[!dir].tuple.dst.u3,
290 IPPROTO_UDP, NULL, &rtp_port);
292 /* Create expect for RTCP */
293 if ((rtcp_exp = nf_conntrack_expect_alloc(ct)) == NULL) {
294 nf_conntrack_expect_put(rtp_exp);
297 nf_conntrack_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
298 &ct->tuplehash[!dir].tuple.src.u3,
299 &ct->tuplehash[!dir].tuple.dst.u3,
300 IPPROTO_UDP, NULL, &rtcp_port);
302 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
303 &ct->tuplehash[!dir].tuple.dst.u3,
304 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
305 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
306 ct->status & IPS_NAT_MASK) {
308 ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
309 taddr, port, rtp_port, rtp_exp, rtcp_exp);
310 } else { /* Conntrack only */
311 if (nf_conntrack_expect_related(rtp_exp) == 0) {
312 if (nf_conntrack_expect_related(rtcp_exp) == 0) {
313 DEBUGP("nf_ct_h323: expect RTP ");
314 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
315 DEBUGP("nf_ct_h323: expect RTCP ");
316 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
318 nf_conntrack_unexpect_related(rtp_exp);
325 nf_conntrack_expect_put(rtp_exp);
326 nf_conntrack_expect_put(rtcp_exp);
331 /****************************************************************************/
332 static int expect_t120(struct sk_buff **pskb,
334 enum ip_conntrack_info ctinfo,
335 unsigned char **data, int dataoff,
336 H245_TransportAddress *taddr)
338 int dir = CTINFO2DIR(ctinfo);
341 union nf_conntrack_address addr;
342 struct nf_conntrack_expect *exp;
343 typeof(nat_t120_hook) nat_t120;
345 /* Read T.120 address */
346 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
347 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
351 /* Create expect for T.120 connections */
352 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
354 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
355 &ct->tuplehash[!dir].tuple.src.u3,
356 &ct->tuplehash[!dir].tuple.dst.u3,
357 IPPROTO_TCP, NULL, &port);
358 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
360 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
361 &ct->tuplehash[!dir].tuple.dst.u3,
362 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
363 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
364 ct->status & IPS_NAT_MASK) {
366 ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr,
368 } else { /* Conntrack only */
369 if (nf_conntrack_expect_related(exp) == 0) {
370 DEBUGP("nf_ct_h323: expect T.120 ");
371 NF_CT_DUMP_TUPLE(&exp->tuple);
376 nf_conntrack_expect_put(exp);
381 /****************************************************************************/
382 static int process_h245_channel(struct sk_buff **pskb,
384 enum ip_conntrack_info ctinfo,
385 unsigned char **data, int dataoff,
386 H2250LogicalChannelParameters *channel)
390 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
392 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
393 &channel->mediaChannel);
399 options & eH2250LogicalChannelParameters_mediaControlChannel) {
401 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
402 &channel->mediaControlChannel);
410 /****************************************************************************/
411 static int process_olc(struct sk_buff **pskb, struct nf_conn *ct,
412 enum ip_conntrack_info ctinfo,
413 unsigned char **data, int dataoff,
414 OpenLogicalChannel *olc)
418 DEBUGP("nf_ct_h323: OpenLogicalChannel\n");
420 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
421 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
423 ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
425 forwardLogicalChannelParameters.
427 h2250LogicalChannelParameters);
433 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
434 (olc->reverseLogicalChannelParameters.options &
435 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
436 && (olc->reverseLogicalChannelParameters.multiplexParameters.
438 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
441 process_h245_channel(pskb, ct, ctinfo, data, dataoff,
443 reverseLogicalChannelParameters.
445 h2250LogicalChannelParameters);
450 if ((olc->options & eOpenLogicalChannel_separateStack) &&
451 olc->forwardLogicalChannelParameters.dataType.choice ==
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(pskb, ct, ctinfo, data, dataoff,
460 &olc->separateStack.networkAddress.
469 /****************************************************************************/
470 static int process_olca(struct sk_buff **pskb, struct nf_conn *ct,
471 enum ip_conntrack_info ctinfo,
472 unsigned char **data, int dataoff,
473 OpenLogicalChannelAck *olca)
475 H2250LogicalChannelAckParameters *ack;
478 DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n");
481 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
482 (olca->reverseLogicalChannelParameters.options &
483 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
484 && (olca->reverseLogicalChannelParameters.multiplexParameters.
486 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
488 ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
490 reverseLogicalChannelParameters.
492 h2250LogicalChannelParameters);
498 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
499 (olca->forwardMultiplexAckParameters.choice ==
500 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
502 ack = &olca->forwardMultiplexAckParameters.
503 h2250LogicalChannelAckParameters;
505 eH2250LogicalChannelAckParameters_mediaChannel) {
507 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
514 eH2250LogicalChannelAckParameters_mediaControlChannel) {
516 ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
517 &ack->mediaControlChannel);
523 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
524 olca->separateStack.networkAddress.choice ==
525 eNetworkAccessParameters_networkAddress_localAreaAddress) {
526 ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
527 &olca->separateStack.networkAddress.
536 /****************************************************************************/
537 static int process_h245(struct sk_buff **pskb, struct nf_conn *ct,
538 enum ip_conntrack_info ctinfo,
539 unsigned char **data, int dataoff,
540 MultimediaSystemControlMessage *mscm)
542 switch (mscm->choice) {
543 case eMultimediaSystemControlMessage_request:
544 if (mscm->request.choice ==
545 eRequestMessage_openLogicalChannel) {
546 return process_olc(pskb, ct, ctinfo, data, dataoff,
547 &mscm->request.openLogicalChannel);
549 DEBUGP("nf_ct_h323: H.245 Request %d\n",
550 mscm->request.choice);
552 case eMultimediaSystemControlMessage_response:
553 if (mscm->response.choice ==
554 eResponseMessage_openLogicalChannelAck) {
555 return process_olca(pskb, ct, ctinfo, data, dataoff,
557 openLogicalChannelAck);
559 DEBUGP("nf_ct_h323: H.245 Response %d\n",
560 mscm->response.choice);
563 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice);
570 /****************************************************************************/
571 static int h245_help(struct sk_buff **pskb, unsigned int protoff,
572 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
574 static MultimediaSystemControlMessage mscm;
575 unsigned char *data = NULL;
580 /* Until there's been traffic both ways, don't look in packets. */
581 if (ctinfo != IP_CT_ESTABLISHED &&
582 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
585 DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len);
587 spin_lock_bh(&nf_h323_lock);
589 /* Process each TPKT */
590 while (get_tpkt_data(pskb, protoff, ct, ctinfo,
591 &data, &datalen, &dataoff)) {
592 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen);
593 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
595 /* Decode H.245 signal */
596 ret = DecodeMultimediaSystemControlMessage(data, datalen,
600 printk("nf_ct_h245: decoding error: %s\n",
601 ret == H323_ERROR_BOUND ?
602 "out of bound" : "out of range");
603 /* We don't drop when decoding error */
607 /* Process H.245 signal */
608 if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
612 spin_unlock_bh(&nf_h323_lock);
616 spin_unlock_bh(&nf_h323_lock);
618 printk("nf_ct_h245: packet dropped\n");
622 /****************************************************************************/
623 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
626 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
628 .tuple.dst.protonum = IPPROTO_UDP,
629 .mask.src.u.udp.port = __constant_htons(0xFFFF),
630 .mask.dst.protonum = 0xFF,
634 /****************************************************************************/
635 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
636 TransportAddress *taddr,
637 union nf_conntrack_address *addr, __be16 *port)
640 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
643 switch (taddr->choice) {
644 case eTransportAddress_ipAddress:
645 if (family != AF_INET)
647 p = data + taddr->ipAddress.ip;
650 case eTransportAddress_ip6Address:
651 if (family != AF_INET6)
653 p = data + taddr->ip6Address.ip;
660 memcpy(addr, p, len);
661 memset((void *)addr + len, 0, sizeof(*addr) - len);
662 memcpy(port, p + len, sizeof(__be16));
667 /****************************************************************************/
668 static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct,
669 enum ip_conntrack_info ctinfo,
670 unsigned char **data, int dataoff,
671 TransportAddress *taddr)
673 int dir = CTINFO2DIR(ctinfo);
676 union nf_conntrack_address addr;
677 struct nf_conntrack_expect *exp;
678 typeof(nat_h245_hook) nat_h245;
680 /* Read h245Address */
681 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
682 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
686 /* Create expect for h245 connection */
687 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
689 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
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;
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 ct->status & IPS_NAT_MASK) {
701 ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr,
703 } else { /* Conntrack only */
704 if (nf_conntrack_expect_related(exp) == 0) {
705 DEBUGP("nf_ct_q931: expect H.245 ");
706 NF_CT_DUMP_TUPLE(&exp->tuple);
711 nf_conntrack_expect_put(exp);
716 /* If the calling party is on the same side of the forward-to party,
717 * we don't need to track the second call */
718 static int callforward_do_filter(union nf_conntrack_address *src,
719 union nf_conntrack_address *dst,
722 struct flowi fl1, fl2;
725 memset(&fl1, 0, sizeof(fl1));
726 memset(&fl2, 0, sizeof(fl2));
730 struct rtable *rt1, *rt2;
732 fl1.fl4_dst = src->ip;
733 fl2.fl4_dst = dst->ip;
734 if (ip_route_output_key(&rt1, &fl1) == 0) {
735 if (ip_route_output_key(&rt2, &fl2) == 0) {
736 if (rt1->rt_gateway == rt2->rt_gateway &&
737 rt1->u.dst.dev == rt2->u.dst.dev)
739 dst_release(&rt2->u.dst);
741 dst_release(&rt1->u.dst);
745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
747 struct rt6_info *rt1, *rt2;
749 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
750 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
751 rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1);
753 rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2);
755 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
756 sizeof(rt1->rt6i_gateway)) &&
757 rt1->u.dst.dev == rt2->u.dst.dev)
759 dst_release(&rt2->u.dst);
761 dst_release(&rt1->u.dst);
771 /****************************************************************************/
772 static int expect_callforwarding(struct sk_buff **pskb,
774 enum ip_conntrack_info ctinfo,
775 unsigned char **data, int dataoff,
776 TransportAddress *taddr)
778 int dir = CTINFO2DIR(ctinfo);
781 union nf_conntrack_address addr;
782 struct nf_conntrack_expect *exp;
783 typeof(nat_callforwarding_hook) nat_callforwarding;
785 /* Read alternativeAddress */
786 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
789 /* If the calling party is on the same side of the forward-to party,
790 * we don't need to track the second call */
791 if (callforward_filter &&
792 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
793 ct->tuplehash[!dir].tuple.src.l3num)) {
794 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
798 /* Create expect for the second call leg */
799 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
801 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
802 &ct->tuplehash[!dir].tuple.src.u3, &addr,
803 IPPROTO_TCP, NULL, &port);
804 exp->helper = nf_conntrack_helper_q931;
806 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
807 &ct->tuplehash[!dir].tuple.dst.u3,
808 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
809 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
810 ct->status & IPS_NAT_MASK) {
812 ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
814 } else { /* Conntrack only */
815 if (nf_conntrack_expect_related(exp) == 0) {
816 DEBUGP("nf_ct_q931: expect Call Forwarding ");
817 NF_CT_DUMP_TUPLE(&exp->tuple);
822 nf_conntrack_expect_put(exp);
827 /****************************************************************************/
828 static int process_setup(struct sk_buff **pskb, struct nf_conn *ct,
829 enum ip_conntrack_info ctinfo,
830 unsigned char **data, int dataoff,
833 int dir = CTINFO2DIR(ctinfo);
837 union nf_conntrack_address addr;
838 typeof(set_h225_addr_hook) set_h225_addr;
840 DEBUGP("nf_ct_q931: Setup\n");
842 if (setup->options & eSetup_UUIE_h245Address) {
843 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
844 &setup->h245Address);
849 set_h225_addr = rcu_dereference(set_h225_addr_hook);
850 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
851 (set_h225_addr) && ct->status && IPS_NAT_MASK &&
852 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
854 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
855 DEBUGP("nf_ct_q931: set destCallSignalAddress "
856 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
857 NIP6(*(struct in6_addr *)&addr), ntohs(port),
858 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
859 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
860 ret = set_h225_addr(pskb, data, dataoff,
861 &setup->destCallSignalAddress,
862 &ct->tuplehash[!dir].tuple.src.u3,
863 ct->tuplehash[!dir].tuple.src.u.tcp.port);
868 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
869 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
870 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
872 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
873 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
874 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
875 NIP6(*(struct in6_addr *)&addr), ntohs(port),
876 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
877 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
878 ret = set_h225_addr(pskb, data, dataoff,
879 &setup->sourceCallSignalAddress,
880 &ct->tuplehash[!dir].tuple.dst.u3,
881 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
886 if (setup->options & eSetup_UUIE_fastStart) {
887 for (i = 0; i < setup->fastStart.count; i++) {
888 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
889 &setup->fastStart.item[i]);
898 /****************************************************************************/
899 static int process_callproceeding(struct sk_buff **pskb,
901 enum ip_conntrack_info ctinfo,
902 unsigned char **data, int dataoff,
903 CallProceeding_UUIE *callproc)
908 DEBUGP("nf_ct_q931: CallProceeding\n");
910 if (callproc->options & eCallProceeding_UUIE_h245Address) {
911 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
912 &callproc->h245Address);
917 if (callproc->options & eCallProceeding_UUIE_fastStart) {
918 for (i = 0; i < callproc->fastStart.count; i++) {
919 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
920 &callproc->fastStart.item[i]);
929 /****************************************************************************/
930 static int process_connect(struct sk_buff **pskb, struct nf_conn *ct,
931 enum ip_conntrack_info ctinfo,
932 unsigned char **data, int dataoff,
933 Connect_UUIE *connect)
938 DEBUGP("nf_ct_q931: Connect\n");
940 if (connect->options & eConnect_UUIE_h245Address) {
941 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
942 &connect->h245Address);
947 if (connect->options & eConnect_UUIE_fastStart) {
948 for (i = 0; i < connect->fastStart.count; i++) {
949 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
950 &connect->fastStart.item[i]);
959 /****************************************************************************/
960 static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct,
961 enum ip_conntrack_info ctinfo,
962 unsigned char **data, int dataoff,
963 Alerting_UUIE *alert)
968 DEBUGP("nf_ct_q931: Alerting\n");
970 if (alert->options & eAlerting_UUIE_h245Address) {
971 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
972 &alert->h245Address);
977 if (alert->options & eAlerting_UUIE_fastStart) {
978 for (i = 0; i < alert->fastStart.count; i++) {
979 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
980 &alert->fastStart.item[i]);
989 /****************************************************************************/
990 static int process_facility(struct sk_buff **pskb, struct nf_conn *ct,
991 enum ip_conntrack_info ctinfo,
992 unsigned char **data, int dataoff,
993 Facility_UUIE *facility)
998 DEBUGP("nf_ct_q931: Facility\n");
1000 if (facility->reason.choice == eFacilityReason_callForwarded) {
1001 if (facility->options & eFacility_UUIE_alternativeAddress)
1002 return expect_callforwarding(pskb, ct, ctinfo, data,
1005 alternativeAddress);
1009 if (facility->options & eFacility_UUIE_h245Address) {
1010 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1011 &facility->h245Address);
1016 if (facility->options & eFacility_UUIE_fastStart) {
1017 for (i = 0; i < facility->fastStart.count; i++) {
1018 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1019 &facility->fastStart.item[i]);
1028 /****************************************************************************/
1029 static int process_progress(struct sk_buff **pskb, struct nf_conn *ct,
1030 enum ip_conntrack_info ctinfo,
1031 unsigned char **data, int dataoff,
1032 Progress_UUIE *progress)
1037 DEBUGP("nf_ct_q931: Progress\n");
1039 if (progress->options & eProgress_UUIE_h245Address) {
1040 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1041 &progress->h245Address);
1046 if (progress->options & eProgress_UUIE_fastStart) {
1047 for (i = 0; i < progress->fastStart.count; i++) {
1048 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1049 &progress->fastStart.item[i]);
1058 /****************************************************************************/
1059 static int process_q931(struct sk_buff **pskb, struct nf_conn *ct,
1060 enum ip_conntrack_info ctinfo,
1061 unsigned char **data, int dataoff, Q931 *q931)
1063 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1067 switch (pdu->h323_message_body.choice) {
1068 case eH323_UU_PDU_h323_message_body_setup:
1069 ret = process_setup(pskb, ct, ctinfo, data, dataoff,
1070 &pdu->h323_message_body.setup);
1072 case eH323_UU_PDU_h323_message_body_callProceeding:
1073 ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
1074 &pdu->h323_message_body.
1077 case eH323_UU_PDU_h323_message_body_connect:
1078 ret = process_connect(pskb, ct, ctinfo, data, dataoff,
1079 &pdu->h323_message_body.connect);
1081 case eH323_UU_PDU_h323_message_body_alerting:
1082 ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
1083 &pdu->h323_message_body.alerting);
1085 case eH323_UU_PDU_h323_message_body_facility:
1086 ret = process_facility(pskb, ct, ctinfo, data, dataoff,
1087 &pdu->h323_message_body.facility);
1089 case eH323_UU_PDU_h323_message_body_progress:
1090 ret = process_progress(pskb, ct, ctinfo, data, dataoff,
1091 &pdu->h323_message_body.progress);
1094 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1095 pdu->h323_message_body.choice);
1102 if (pdu->options & eH323_UU_PDU_h245Control) {
1103 for (i = 0; i < pdu->h245Control.count; i++) {
1104 ret = process_h245(pskb, ct, ctinfo, data, dataoff,
1105 &pdu->h245Control.item[i]);
1114 /****************************************************************************/
1115 static int q931_help(struct sk_buff **pskb, unsigned int protoff,
1116 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1119 unsigned char *data = NULL;
1124 /* Until there's been traffic both ways, don't look in packets. */
1125 if (ctinfo != IP_CT_ESTABLISHED &&
1126 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1129 DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len);
1131 spin_lock_bh(&nf_h323_lock);
1133 /* Process each TPKT */
1134 while (get_tpkt_data(pskb, protoff, ct, ctinfo,
1135 &data, &datalen, &dataoff)) {
1136 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen);
1137 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1139 /* Decode Q.931 signal */
1140 ret = DecodeQ931(data, datalen, &q931);
1142 if (net_ratelimit())
1143 printk("nf_ct_q931: decoding error: %s\n",
1144 ret == H323_ERROR_BOUND ?
1145 "out of bound" : "out of range");
1146 /* We don't drop when decoding error */
1150 /* Process Q.931 signal */
1151 if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
1155 spin_unlock_bh(&nf_h323_lock);
1159 spin_unlock_bh(&nf_h323_lock);
1160 if (net_ratelimit())
1161 printk("nf_ct_q931: packet dropped\n");
1165 /****************************************************************************/
1166 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1170 /* T.120 and H.245 */
1171 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1173 .tuple.src.l3num = AF_INET,
1174 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1175 .tuple.dst.protonum = IPPROTO_TCP,
1176 .mask.src.l3num = 0xFFFF,
1177 .mask.src.u.tcp.port = __constant_htons(0xFFFF),
1178 .mask.dst.protonum = 0xFF,
1184 /* T.120 and H.245 */
1185 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1187 .tuple.src.l3num = AF_INET6,
1188 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1189 .tuple.dst.protonum = IPPROTO_TCP,
1190 .mask.src.l3num = 0xFFFF,
1191 .mask.src.u.tcp.port = __constant_htons(0xFFFF),
1192 .mask.dst.protonum = 0xFF,
1197 /****************************************************************************/
1198 static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff,
1201 struct udphdr _uh, *uh;
1204 uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh);
1207 dataoff = protoff + sizeof(_uh);
1208 if (dataoff >= (*pskb)->len)
1210 *datalen = (*pskb)->len - dataoff;
1211 return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
1214 /****************************************************************************/
1215 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1216 union nf_conntrack_address *addr,
1219 struct nf_conntrack_expect *exp;
1220 struct nf_conntrack_tuple tuple;
1222 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1223 tuple.src.u.tcp.port = 0;
1224 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1225 tuple.dst.u.tcp.port = port;
1226 tuple.dst.protonum = IPPROTO_TCP;
1228 exp = __nf_conntrack_expect_find(&tuple);
1229 if (exp && exp->master == ct)
1234 /****************************************************************************/
1235 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1238 if (!exp || !del_timer(&exp->timeout))
1241 exp->timeout.expires = jiffies + timeout * HZ;
1242 add_timer(&exp->timeout);
1247 /****************************************************************************/
1248 static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct,
1249 enum ip_conntrack_info ctinfo,
1250 unsigned char **data,
1251 TransportAddress *taddr, int count)
1253 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1254 int dir = CTINFO2DIR(ctinfo);
1258 union nf_conntrack_address addr;
1259 struct nf_conntrack_expect *exp;
1260 typeof(nat_q931_hook) nat_q931;
1262 /* Look for the first related address */
1263 for (i = 0; i < count; i++) {
1264 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1265 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1266 sizeof(addr)) == 0 && port != 0)
1270 if (i >= count) /* Not found */
1273 /* Create expect for Q.931 */
1274 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1276 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1277 gkrouted_only ? /* only accept calls from GK? */
1278 &ct->tuplehash[!dir].tuple.src.u3 :
1280 &ct->tuplehash[!dir].tuple.dst.u3,
1281 IPPROTO_TCP, NULL, &port);
1282 exp->helper = nf_conntrack_helper_q931;
1283 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1285 nat_q931 = rcu_dereference(nat_q931_hook);
1286 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
1287 ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp);
1288 } else { /* Conntrack only */
1289 if (nf_conntrack_expect_related(exp) == 0) {
1290 DEBUGP("nf_ct_ras: expect Q.931 ");
1291 NF_CT_DUMP_TUPLE(&exp->tuple);
1293 /* Save port for looking up expect in processing RCF */
1294 info->sig_port[dir] = port;
1299 nf_conntrack_expect_put(exp);
1304 /****************************************************************************/
1305 static int process_grq(struct sk_buff **pskb, struct nf_conn *ct,
1306 enum ip_conntrack_info ctinfo,
1307 unsigned char **data, GatekeeperRequest *grq)
1309 typeof(set_ras_addr_hook) set_ras_addr;
1311 DEBUGP("nf_ct_ras: GRQ\n");
1313 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1314 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
1315 return set_ras_addr(pskb, ct, ctinfo, data,
1316 &grq->rasAddress, 1);
1320 /****************************************************************************/
1321 static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct,
1322 enum ip_conntrack_info ctinfo,
1323 unsigned char **data, GatekeeperConfirm *gcf)
1325 int dir = CTINFO2DIR(ctinfo);
1328 union nf_conntrack_address addr;
1329 struct nf_conntrack_expect *exp;
1331 DEBUGP("nf_ct_ras: GCF\n");
1333 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1336 /* Registration port is the same as discovery port */
1337 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1338 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1341 /* Avoid RAS expectation loops. A GCF is never expected. */
1342 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1345 /* Need new expect */
1346 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1348 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1349 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1350 IPPROTO_UDP, NULL, &port);
1351 exp->helper = nf_conntrack_helper_ras;
1353 if (nf_conntrack_expect_related(exp) == 0) {
1354 DEBUGP("nf_ct_ras: expect RAS ");
1355 NF_CT_DUMP_TUPLE(&exp->tuple);
1359 nf_conntrack_expect_put(exp);
1364 /****************************************************************************/
1365 static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct,
1366 enum ip_conntrack_info ctinfo,
1367 unsigned char **data, RegistrationRequest *rrq)
1369 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1371 typeof(set_ras_addr_hook) set_ras_addr;
1373 DEBUGP("nf_ct_ras: RRQ\n");
1375 ret = expect_q931(pskb, ct, ctinfo, data,
1376 rrq->callSignalAddress.item,
1377 rrq->callSignalAddress.count);
1381 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1382 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1383 ret = set_ras_addr(pskb, ct, ctinfo, data,
1384 rrq->rasAddress.item,
1385 rrq->rasAddress.count);
1390 if (rrq->options & eRegistrationRequest_timeToLive) {
1391 DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1392 info->timeout = rrq->timeToLive;
1394 info->timeout = default_rrq_ttl;
1399 /****************************************************************************/
1400 static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct,
1401 enum ip_conntrack_info ctinfo,
1402 unsigned char **data, RegistrationConfirm *rcf)
1404 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1405 int dir = CTINFO2DIR(ctinfo);
1407 struct nf_conntrack_expect *exp;
1408 typeof(set_sig_addr_hook) set_sig_addr;
1410 DEBUGP("nf_ct_ras: RCF\n");
1412 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1413 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1414 ret = set_sig_addr(pskb, ct, ctinfo, data,
1415 rcf->callSignalAddress.item,
1416 rcf->callSignalAddress.count);
1421 if (rcf->options & eRegistrationConfirm_timeToLive) {
1422 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1423 info->timeout = rcf->timeToLive;
1426 if (info->timeout > 0) {
1428 ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1430 nf_ct_refresh(ct, *pskb, info->timeout * HZ);
1432 /* Set expect timeout */
1433 read_lock_bh(&nf_conntrack_lock);
1434 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1435 info->sig_port[!dir]);
1437 DEBUGP("nf_ct_ras: set Q.931 expect "
1438 "timeout to %u seconds for",
1440 NF_CT_DUMP_TUPLE(&exp->tuple);
1441 set_expect_timeout(exp, info->timeout);
1443 read_unlock_bh(&nf_conntrack_lock);
1449 /****************************************************************************/
1450 static int process_urq(struct sk_buff **pskb, struct nf_conn *ct,
1451 enum ip_conntrack_info ctinfo,
1452 unsigned char **data, UnregistrationRequest *urq)
1454 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1455 int dir = CTINFO2DIR(ctinfo);
1457 typeof(set_sig_addr_hook) set_sig_addr;
1459 DEBUGP("nf_ct_ras: URQ\n");
1461 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1462 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1463 ret = set_sig_addr(pskb, ct, ctinfo, data,
1464 urq->callSignalAddress.item,
1465 urq->callSignalAddress.count);
1470 /* Clear old expect */
1471 nf_ct_remove_expectations(ct);
1472 info->sig_port[dir] = 0;
1473 info->sig_port[!dir] = 0;
1475 /* Give it 30 seconds for UCF or URJ */
1476 nf_ct_refresh(ct, *pskb, 30 * HZ);
1481 /****************************************************************************/
1482 static int process_arq(struct sk_buff **pskb, struct nf_conn *ct,
1483 enum ip_conntrack_info ctinfo,
1484 unsigned char **data, AdmissionRequest *arq)
1486 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1487 int dir = CTINFO2DIR(ctinfo);
1489 union nf_conntrack_address addr;
1490 typeof(set_h225_addr_hook) set_h225_addr;
1492 DEBUGP("nf_ct_ras: ARQ\n");
1494 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1495 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1496 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1498 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1499 port == info->sig_port[dir] &&
1500 set_h225_addr && ct->status & IPS_NAT_MASK) {
1502 return set_h225_addr(pskb, data, 0,
1503 &arq->destCallSignalAddress,
1504 &ct->tuplehash[!dir].tuple.dst.u3,
1505 info->sig_port[!dir]);
1508 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1509 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1511 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1512 set_h225_addr && ct->status & IPS_NAT_MASK) {
1514 return set_h225_addr(pskb, data, 0,
1515 &arq->srcCallSignalAddress,
1516 &ct->tuplehash[!dir].tuple.dst.u3,
1523 /****************************************************************************/
1524 static int process_acf(struct sk_buff **pskb, struct nf_conn *ct,
1525 enum ip_conntrack_info ctinfo,
1526 unsigned char **data, AdmissionConfirm *acf)
1528 int dir = CTINFO2DIR(ctinfo);
1531 union nf_conntrack_address addr;
1532 struct nf_conntrack_expect *exp;
1533 typeof(set_sig_addr_hook) set_sig_addr;
1535 DEBUGP("nf_ct_ras: ACF\n");
1537 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1541 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1543 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1544 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1545 return set_sig_addr(pskb, ct, ctinfo, data,
1546 &acf->destCallSignalAddress, 1);
1550 /* Need new expect */
1551 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1553 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1554 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1555 IPPROTO_TCP, NULL, &port);
1556 exp->flags = NF_CT_EXPECT_PERMANENT;
1557 exp->helper = nf_conntrack_helper_q931;
1559 if (nf_conntrack_expect_related(exp) == 0) {
1560 DEBUGP("nf_ct_ras: expect Q.931 ");
1561 NF_CT_DUMP_TUPLE(&exp->tuple);
1565 nf_conntrack_expect_put(exp);
1570 /****************************************************************************/
1571 static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct,
1572 enum ip_conntrack_info ctinfo,
1573 unsigned char **data, LocationRequest *lrq)
1575 typeof(set_ras_addr_hook) set_ras_addr;
1577 DEBUGP("nf_ct_ras: LRQ\n");
1579 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1580 if (set_ras_addr && ct->status & IPS_NAT_MASK)
1581 return set_ras_addr(pskb, ct, ctinfo, data,
1582 &lrq->replyAddress, 1);
1586 /****************************************************************************/
1587 static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct,
1588 enum ip_conntrack_info ctinfo,
1589 unsigned char **data, LocationConfirm *lcf)
1591 int dir = CTINFO2DIR(ctinfo);
1594 union nf_conntrack_address addr;
1595 struct nf_conntrack_expect *exp;
1597 DEBUGP("nf_ct_ras: LCF\n");
1599 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1603 /* Need new expect for call signal */
1604 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1606 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1607 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1608 IPPROTO_TCP, NULL, &port);
1609 exp->flags = NF_CT_EXPECT_PERMANENT;
1610 exp->helper = nf_conntrack_helper_q931;
1612 if (nf_conntrack_expect_related(exp) == 0) {
1613 DEBUGP("nf_ct_ras: expect Q.931 ");
1614 NF_CT_DUMP_TUPLE(&exp->tuple);
1618 nf_conntrack_expect_put(exp);
1620 /* Ignore rasAddress */
1625 /****************************************************************************/
1626 static int process_irr(struct sk_buff **pskb, struct nf_conn *ct,
1627 enum ip_conntrack_info ctinfo,
1628 unsigned char **data, InfoRequestResponse *irr)
1631 typeof(set_ras_addr_hook) set_ras_addr;
1632 typeof(set_sig_addr_hook) set_sig_addr;
1634 DEBUGP("nf_ct_ras: IRR\n");
1636 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1637 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1638 ret = set_ras_addr(pskb, ct, ctinfo, data,
1639 &irr->rasAddress, 1);
1644 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1645 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1646 ret = set_sig_addr(pskb, ct, ctinfo, data,
1647 irr->callSignalAddress.item,
1648 irr->callSignalAddress.count);
1656 /****************************************************************************/
1657 static int process_ras(struct sk_buff **pskb, struct nf_conn *ct,
1658 enum ip_conntrack_info ctinfo,
1659 unsigned char **data, RasMessage *ras)
1661 switch (ras->choice) {
1662 case eRasMessage_gatekeeperRequest:
1663 return process_grq(pskb, ct, ctinfo, data,
1664 &ras->gatekeeperRequest);
1665 case eRasMessage_gatekeeperConfirm:
1666 return process_gcf(pskb, ct, ctinfo, data,
1667 &ras->gatekeeperConfirm);
1668 case eRasMessage_registrationRequest:
1669 return process_rrq(pskb, ct, ctinfo, data,
1670 &ras->registrationRequest);
1671 case eRasMessage_registrationConfirm:
1672 return process_rcf(pskb, ct, ctinfo, data,
1673 &ras->registrationConfirm);
1674 case eRasMessage_unregistrationRequest:
1675 return process_urq(pskb, ct, ctinfo, data,
1676 &ras->unregistrationRequest);
1677 case eRasMessage_admissionRequest:
1678 return process_arq(pskb, ct, ctinfo, data,
1679 &ras->admissionRequest);
1680 case eRasMessage_admissionConfirm:
1681 return process_acf(pskb, ct, ctinfo, data,
1682 &ras->admissionConfirm);
1683 case eRasMessage_locationRequest:
1684 return process_lrq(pskb, ct, ctinfo, data,
1685 &ras->locationRequest);
1686 case eRasMessage_locationConfirm:
1687 return process_lcf(pskb, ct, ctinfo, data,
1688 &ras->locationConfirm);
1689 case eRasMessage_infoRequestResponse:
1690 return process_irr(pskb, ct, ctinfo, data,
1691 &ras->infoRequestResponse);
1693 DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice);
1700 /****************************************************************************/
1701 static int ras_help(struct sk_buff **pskb, unsigned int protoff,
1702 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1704 static RasMessage ras;
1705 unsigned char *data;
1709 DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len);
1711 spin_lock_bh(&nf_h323_lock);
1714 data = get_udp_data(pskb, protoff, &datalen);
1717 DEBUGP("nf_ct_ras: RAS message len=%d ", datalen);
1718 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1720 /* Decode RAS message */
1721 ret = DecodeRasMessage(data, datalen, &ras);
1723 if (net_ratelimit())
1724 printk("nf_ct_ras: decoding error: %s\n",
1725 ret == H323_ERROR_BOUND ?
1726 "out of bound" : "out of range");
1730 /* Process RAS message */
1731 if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
1735 spin_unlock_bh(&nf_h323_lock);
1739 spin_unlock_bh(&nf_h323_lock);
1740 if (net_ratelimit())
1741 printk("nf_ct_ras: packet dropped\n");
1745 /****************************************************************************/
1746 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1752 .tuple.src.l3num = AF_INET,
1753 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1754 .tuple.dst.protonum = IPPROTO_UDP,
1755 .mask.src.l3num = 0xFFFF,
1756 .mask.src.u.udp.port = __constant_htons(0xFFFF),
1757 .mask.dst.protonum = 0xFF,
1765 .tuple.src.l3num = AF_INET6,
1766 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1767 .tuple.dst.protonum = IPPROTO_UDP,
1768 .mask.src.l3num = 0xFFFF,
1769 .mask.src.u.udp.port = __constant_htons(0xFFFF),
1770 .mask.dst.protonum = 0xFF,
1775 /****************************************************************************/
1776 static void __exit nf_conntrack_h323_fini(void)
1778 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1779 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1780 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1781 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1783 DEBUGP("nf_ct_h323: fini\n");
1786 /****************************************************************************/
1787 static int __init nf_conntrack_h323_init(void)
1791 h323_buffer = kmalloc(65536, GFP_KERNEL);
1794 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1797 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1800 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1803 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1806 DEBUGP("nf_ct_h323: init success\n");
1810 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1812 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1814 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1819 /****************************************************************************/
1820 module_init(nf_conntrack_h323_init);
1821 module_exit(nf_conntrack_h323_fini);
1823 EXPORT_SYMBOL_GPL(get_h225_addr);
1824 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1825 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1826 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1827 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1828 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1829 EXPORT_SYMBOL_GPL(nat_t120_hook);
1830 EXPORT_SYMBOL_GPL(nat_h245_hook);
1831 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1832 EXPORT_SYMBOL_GPL(nat_q931_hook);
1834 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1835 MODULE_DESCRIPTION("H.323 connection tracking helper");
1836 MODULE_LICENSE("GPL");
1837 MODULE_ALIAS("ip_conntrack_h323");