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);
526 /****************************************************************************/
527 static int process_h245(struct sk_buff **pskb, struct nf_conn *ct,
528 enum ip_conntrack_info ctinfo,
529 unsigned char **data, int dataoff,
530 MultimediaSystemControlMessage *mscm)
532 switch (mscm->choice) {
533 case eMultimediaSystemControlMessage_request:
534 if (mscm->request.choice ==
535 eRequestMessage_openLogicalChannel) {
536 return process_olc(pskb, ct, ctinfo, data, dataoff,
537 &mscm->request.openLogicalChannel);
539 DEBUGP("nf_ct_h323: H.245 Request %d\n",
540 mscm->request.choice);
542 case eMultimediaSystemControlMessage_response:
543 if (mscm->response.choice ==
544 eResponseMessage_openLogicalChannelAck) {
545 return process_olca(pskb, ct, ctinfo, data, dataoff,
547 openLogicalChannelAck);
549 DEBUGP("nf_ct_h323: H.245 Response %d\n",
550 mscm->response.choice);
553 DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice);
560 /****************************************************************************/
561 static int h245_help(struct sk_buff **pskb, unsigned int protoff,
562 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
564 static MultimediaSystemControlMessage mscm;
565 unsigned char *data = NULL;
570 /* Until there's been traffic both ways, don't look in packets. */
571 if (ctinfo != IP_CT_ESTABLISHED &&
572 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
575 DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len);
577 spin_lock_bh(&nf_h323_lock);
579 /* Process each TPKT */
580 while (get_tpkt_data(pskb, protoff, ct, ctinfo,
581 &data, &datalen, &dataoff)) {
582 DEBUGP("nf_ct_h245: TPKT len=%d ", datalen);
583 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
585 /* Decode H.245 signal */
586 ret = DecodeMultimediaSystemControlMessage(data, datalen,
590 printk("nf_ct_h245: decoding error: %s\n",
591 ret == H323_ERROR_BOUND ?
592 "out of bound" : "out of range");
593 /* We don't drop when decoding error */
597 /* Process H.245 signal */
598 if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
602 spin_unlock_bh(&nf_h323_lock);
606 spin_unlock_bh(&nf_h323_lock);
608 printk("nf_ct_h245: packet dropped\n");
612 /****************************************************************************/
613 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
616 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
618 .tuple.dst.protonum = IPPROTO_UDP,
619 .mask.src.u.udp.port = __constant_htons(0xFFFF),
620 .mask.dst.protonum = 0xFF,
624 /****************************************************************************/
625 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
626 TransportAddress *taddr,
627 union nf_conntrack_address *addr, __be16 *port)
630 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
633 switch (taddr->choice) {
634 case eTransportAddress_ipAddress:
635 if (family != AF_INET)
637 p = data + taddr->ipAddress.ip;
640 case eTransportAddress_ip6Address:
641 if (family != AF_INET6)
643 p = data + taddr->ip6Address.ip6;
650 memcpy(addr, p, len);
651 memset((void *)addr + len, 0, sizeof(*addr) - len);
652 memcpy(port, p + len, sizeof(__be16));
657 /****************************************************************************/
658 static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct,
659 enum ip_conntrack_info ctinfo,
660 unsigned char **data, int dataoff,
661 TransportAddress *taddr)
663 int dir = CTINFO2DIR(ctinfo);
666 union nf_conntrack_address addr;
667 struct nf_conntrack_expect *exp;
668 typeof(nat_h245_hook) nat_h245;
670 /* Read h245Address */
671 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
672 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
676 /* Create expect for h245 connection */
677 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
679 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
680 &ct->tuplehash[!dir].tuple.src.u3,
681 &ct->tuplehash[!dir].tuple.dst.u3,
682 IPPROTO_TCP, NULL, &port);
683 exp->helper = &nf_conntrack_helper_h245;
685 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
686 &ct->tuplehash[!dir].tuple.dst.u3,
687 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
688 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
689 ct->status & IPS_NAT_MASK) {
691 ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr,
693 } else { /* Conntrack only */
694 if (nf_conntrack_expect_related(exp) == 0) {
695 DEBUGP("nf_ct_q931: expect H.245 ");
696 NF_CT_DUMP_TUPLE(&exp->tuple);
701 nf_conntrack_expect_put(exp);
706 /* If the calling party is on the same side of the forward-to party,
707 * we don't need to track the second call */
708 static int callforward_do_filter(union nf_conntrack_address *src,
709 union nf_conntrack_address *dst,
712 struct flowi fl1, fl2;
715 memset(&fl1, 0, sizeof(fl1));
716 memset(&fl2, 0, sizeof(fl2));
720 struct rtable *rt1, *rt2;
722 fl1.fl4_dst = src->ip;
723 fl2.fl4_dst = dst->ip;
724 if (ip_route_output_key(&rt1, &fl1) == 0) {
725 if (ip_route_output_key(&rt2, &fl2) == 0) {
726 if (rt1->rt_gateway == rt2->rt_gateway &&
727 rt1->u.dst.dev == rt2->u.dst.dev)
729 dst_release(&rt2->u.dst);
731 dst_release(&rt1->u.dst);
735 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
737 struct rt6_info *rt1, *rt2;
739 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
740 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
741 rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1);
743 rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2);
745 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
746 sizeof(rt1->rt6i_gateway)) &&
747 rt1->u.dst.dev == rt2->u.dst.dev)
749 dst_release(&rt2->u.dst);
751 dst_release(&rt1->u.dst);
761 /****************************************************************************/
762 static int expect_callforwarding(struct sk_buff **pskb,
764 enum ip_conntrack_info ctinfo,
765 unsigned char **data, int dataoff,
766 TransportAddress *taddr)
768 int dir = CTINFO2DIR(ctinfo);
771 union nf_conntrack_address addr;
772 struct nf_conntrack_expect *exp;
773 typeof(nat_callforwarding_hook) nat_callforwarding;
775 /* Read alternativeAddress */
776 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
779 /* If the calling party is on the same side of the forward-to party,
780 * we don't need to track the second call */
781 if (callforward_filter &&
782 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
783 ct->tuplehash[!dir].tuple.src.l3num)) {
784 DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
788 /* Create expect for the second call leg */
789 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
791 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
792 &ct->tuplehash[!dir].tuple.src.u3, &addr,
793 IPPROTO_TCP, NULL, &port);
794 exp->helper = nf_conntrack_helper_q931;
796 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
797 &ct->tuplehash[!dir].tuple.dst.u3,
798 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
799 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
800 ct->status & IPS_NAT_MASK) {
802 ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
804 } else { /* Conntrack only */
805 if (nf_conntrack_expect_related(exp) == 0) {
806 DEBUGP("nf_ct_q931: expect Call Forwarding ");
807 NF_CT_DUMP_TUPLE(&exp->tuple);
812 nf_conntrack_expect_put(exp);
817 /****************************************************************************/
818 static int process_setup(struct sk_buff **pskb, struct nf_conn *ct,
819 enum ip_conntrack_info ctinfo,
820 unsigned char **data, int dataoff,
823 int dir = CTINFO2DIR(ctinfo);
827 union nf_conntrack_address addr;
828 typeof(set_h225_addr_hook) set_h225_addr;
830 DEBUGP("nf_ct_q931: Setup\n");
832 if (setup->options & eSetup_UUIE_h245Address) {
833 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
834 &setup->h245Address);
839 set_h225_addr = rcu_dereference(set_h225_addr_hook);
840 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
841 (set_h225_addr) && ct->status && IPS_NAT_MASK &&
842 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
844 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
845 DEBUGP("nf_ct_q931: set destCallSignalAddress "
846 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
847 NIP6(*(struct in6_addr *)&addr), ntohs(port),
848 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
849 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
850 ret = set_h225_addr(pskb, data, dataoff,
851 &setup->destCallSignalAddress,
852 &ct->tuplehash[!dir].tuple.src.u3,
853 ct->tuplehash[!dir].tuple.src.u.tcp.port);
858 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
859 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
860 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
862 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
863 DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
864 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
865 NIP6(*(struct in6_addr *)&addr), ntohs(port),
866 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
867 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
868 ret = set_h225_addr(pskb, data, dataoff,
869 &setup->sourceCallSignalAddress,
870 &ct->tuplehash[!dir].tuple.dst.u3,
871 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
876 if (setup->options & eSetup_UUIE_fastStart) {
877 for (i = 0; i < setup->fastStart.count; i++) {
878 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
879 &setup->fastStart.item[i]);
888 /****************************************************************************/
889 static int process_callproceeding(struct sk_buff **pskb,
891 enum ip_conntrack_info ctinfo,
892 unsigned char **data, int dataoff,
893 CallProceeding_UUIE *callproc)
898 DEBUGP("nf_ct_q931: CallProceeding\n");
900 if (callproc->options & eCallProceeding_UUIE_h245Address) {
901 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
902 &callproc->h245Address);
907 if (callproc->options & eCallProceeding_UUIE_fastStart) {
908 for (i = 0; i < callproc->fastStart.count; i++) {
909 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
910 &callproc->fastStart.item[i]);
919 /****************************************************************************/
920 static int process_connect(struct sk_buff **pskb, struct nf_conn *ct,
921 enum ip_conntrack_info ctinfo,
922 unsigned char **data, int dataoff,
923 Connect_UUIE *connect)
928 DEBUGP("nf_ct_q931: Connect\n");
930 if (connect->options & eConnect_UUIE_h245Address) {
931 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
932 &connect->h245Address);
937 if (connect->options & eConnect_UUIE_fastStart) {
938 for (i = 0; i < connect->fastStart.count; i++) {
939 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
940 &connect->fastStart.item[i]);
949 /****************************************************************************/
950 static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct,
951 enum ip_conntrack_info ctinfo,
952 unsigned char **data, int dataoff,
953 Alerting_UUIE *alert)
958 DEBUGP("nf_ct_q931: Alerting\n");
960 if (alert->options & eAlerting_UUIE_h245Address) {
961 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
962 &alert->h245Address);
967 if (alert->options & eAlerting_UUIE_fastStart) {
968 for (i = 0; i < alert->fastStart.count; i++) {
969 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
970 &alert->fastStart.item[i]);
979 /****************************************************************************/
980 static int process_information(struct sk_buff **pskb,
982 enum ip_conntrack_info ctinfo,
983 unsigned char **data, int dataoff,
984 Information_UUIE *info)
989 DEBUGP("nf_ct_q931: Information\n");
991 if (info->options & eInformation_UUIE_fastStart) {
992 for (i = 0; i < info->fastStart.count; i++) {
993 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
994 &info->fastStart.item[i]);
1003 /****************************************************************************/
1004 static int process_facility(struct sk_buff **pskb, struct nf_conn *ct,
1005 enum ip_conntrack_info ctinfo,
1006 unsigned char **data, int dataoff,
1007 Facility_UUIE *facility)
1012 DEBUGP("nf_ct_q931: Facility\n");
1014 if (facility->reason.choice == eFacilityReason_callForwarded) {
1015 if (facility->options & eFacility_UUIE_alternativeAddress)
1016 return expect_callforwarding(pskb, ct, ctinfo, data,
1019 alternativeAddress);
1023 if (facility->options & eFacility_UUIE_h245Address) {
1024 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1025 &facility->h245Address);
1030 if (facility->options & eFacility_UUIE_fastStart) {
1031 for (i = 0; i < facility->fastStart.count; i++) {
1032 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1033 &facility->fastStart.item[i]);
1042 /****************************************************************************/
1043 static int process_progress(struct sk_buff **pskb, struct nf_conn *ct,
1044 enum ip_conntrack_info ctinfo,
1045 unsigned char **data, int dataoff,
1046 Progress_UUIE *progress)
1051 DEBUGP("nf_ct_q931: Progress\n");
1053 if (progress->options & eProgress_UUIE_h245Address) {
1054 ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
1055 &progress->h245Address);
1060 if (progress->options & eProgress_UUIE_fastStart) {
1061 for (i = 0; i < progress->fastStart.count; i++) {
1062 ret = process_olc(pskb, ct, ctinfo, data, dataoff,
1063 &progress->fastStart.item[i]);
1072 /****************************************************************************/
1073 static int process_q931(struct sk_buff **pskb, struct nf_conn *ct,
1074 enum ip_conntrack_info ctinfo,
1075 unsigned char **data, int dataoff, Q931 *q931)
1077 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1081 switch (pdu->h323_message_body.choice) {
1082 case eH323_UU_PDU_h323_message_body_setup:
1083 ret = process_setup(pskb, ct, ctinfo, data, dataoff,
1084 &pdu->h323_message_body.setup);
1086 case eH323_UU_PDU_h323_message_body_callProceeding:
1087 ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
1088 &pdu->h323_message_body.
1091 case eH323_UU_PDU_h323_message_body_connect:
1092 ret = process_connect(pskb, ct, ctinfo, data, dataoff,
1093 &pdu->h323_message_body.connect);
1095 case eH323_UU_PDU_h323_message_body_alerting:
1096 ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
1097 &pdu->h323_message_body.alerting);
1099 case eH323_UU_PDU_h323_message_body_information:
1100 ret = process_information(pskb, ct, ctinfo, data, dataoff,
1101 &pdu->h323_message_body.
1104 case eH323_UU_PDU_h323_message_body_facility:
1105 ret = process_facility(pskb, ct, ctinfo, data, dataoff,
1106 &pdu->h323_message_body.facility);
1108 case eH323_UU_PDU_h323_message_body_progress:
1109 ret = process_progress(pskb, ct, ctinfo, data, dataoff,
1110 &pdu->h323_message_body.progress);
1113 DEBUGP("nf_ct_q931: Q.931 signal %d\n",
1114 pdu->h323_message_body.choice);
1121 if (pdu->options & eH323_UU_PDU_h245Control) {
1122 for (i = 0; i < pdu->h245Control.count; i++) {
1123 ret = process_h245(pskb, ct, ctinfo, data, dataoff,
1124 &pdu->h245Control.item[i]);
1133 /****************************************************************************/
1134 static int q931_help(struct sk_buff **pskb, unsigned int protoff,
1135 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1138 unsigned char *data = NULL;
1143 /* Until there's been traffic both ways, don't look in packets. */
1144 if (ctinfo != IP_CT_ESTABLISHED &&
1145 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1148 DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len);
1150 spin_lock_bh(&nf_h323_lock);
1152 /* Process each TPKT */
1153 while (get_tpkt_data(pskb, protoff, ct, ctinfo,
1154 &data, &datalen, &dataoff)) {
1155 DEBUGP("nf_ct_q931: TPKT len=%d ", datalen);
1156 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1158 /* Decode Q.931 signal */
1159 ret = DecodeQ931(data, datalen, &q931);
1161 if (net_ratelimit())
1162 printk("nf_ct_q931: decoding error: %s\n",
1163 ret == H323_ERROR_BOUND ?
1164 "out of bound" : "out of range");
1165 /* We don't drop when decoding error */
1169 /* Process Q.931 signal */
1170 if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
1174 spin_unlock_bh(&nf_h323_lock);
1178 spin_unlock_bh(&nf_h323_lock);
1179 if (net_ratelimit())
1180 printk("nf_ct_q931: packet dropped\n");
1184 /****************************************************************************/
1185 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1189 /* T.120 and H.245 */
1190 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1192 .tuple.src.l3num = AF_INET,
1193 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1194 .tuple.dst.protonum = IPPROTO_TCP,
1195 .mask.src.l3num = 0xFFFF,
1196 .mask.src.u.tcp.port = __constant_htons(0xFFFF),
1197 .mask.dst.protonum = 0xFF,
1203 /* T.120 and H.245 */
1204 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1206 .tuple.src.l3num = AF_INET6,
1207 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1208 .tuple.dst.protonum = IPPROTO_TCP,
1209 .mask.src.l3num = 0xFFFF,
1210 .mask.src.u.tcp.port = __constant_htons(0xFFFF),
1211 .mask.dst.protonum = 0xFF,
1216 /****************************************************************************/
1217 static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff,
1220 struct udphdr _uh, *uh;
1223 uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh);
1226 dataoff = protoff + sizeof(_uh);
1227 if (dataoff >= (*pskb)->len)
1229 *datalen = (*pskb)->len - dataoff;
1230 return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
1233 /****************************************************************************/
1234 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1235 union nf_conntrack_address *addr,
1238 struct nf_conntrack_expect *exp;
1239 struct nf_conntrack_tuple tuple;
1241 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1242 tuple.src.u.tcp.port = 0;
1243 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1244 tuple.dst.u.tcp.port = port;
1245 tuple.dst.protonum = IPPROTO_TCP;
1247 exp = __nf_conntrack_expect_find(&tuple);
1248 if (exp && exp->master == ct)
1253 /****************************************************************************/
1254 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1257 if (!exp || !del_timer(&exp->timeout))
1260 exp->timeout.expires = jiffies + timeout * HZ;
1261 add_timer(&exp->timeout);
1266 /****************************************************************************/
1267 static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct,
1268 enum ip_conntrack_info ctinfo,
1269 unsigned char **data,
1270 TransportAddress *taddr, int count)
1272 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1273 int dir = CTINFO2DIR(ctinfo);
1277 union nf_conntrack_address addr;
1278 struct nf_conntrack_expect *exp;
1279 typeof(nat_q931_hook) nat_q931;
1281 /* Look for the first related address */
1282 for (i = 0; i < count; i++) {
1283 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1284 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1285 sizeof(addr)) == 0 && port != 0)
1289 if (i >= count) /* Not found */
1292 /* Create expect for Q.931 */
1293 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1295 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1296 gkrouted_only ? /* only accept calls from GK? */
1297 &ct->tuplehash[!dir].tuple.src.u3 :
1299 &ct->tuplehash[!dir].tuple.dst.u3,
1300 IPPROTO_TCP, NULL, &port);
1301 exp->helper = nf_conntrack_helper_q931;
1302 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1304 nat_q931 = rcu_dereference(nat_q931_hook);
1305 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
1306 ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp);
1307 } else { /* Conntrack only */
1308 if (nf_conntrack_expect_related(exp) == 0) {
1309 DEBUGP("nf_ct_ras: expect Q.931 ");
1310 NF_CT_DUMP_TUPLE(&exp->tuple);
1312 /* Save port for looking up expect in processing RCF */
1313 info->sig_port[dir] = port;
1318 nf_conntrack_expect_put(exp);
1323 /****************************************************************************/
1324 static int process_grq(struct sk_buff **pskb, struct nf_conn *ct,
1325 enum ip_conntrack_info ctinfo,
1326 unsigned char **data, GatekeeperRequest *grq)
1328 typeof(set_ras_addr_hook) set_ras_addr;
1330 DEBUGP("nf_ct_ras: GRQ\n");
1332 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1333 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
1334 return set_ras_addr(pskb, ct, ctinfo, data,
1335 &grq->rasAddress, 1);
1339 /****************************************************************************/
1340 static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct,
1341 enum ip_conntrack_info ctinfo,
1342 unsigned char **data, GatekeeperConfirm *gcf)
1344 int dir = CTINFO2DIR(ctinfo);
1347 union nf_conntrack_address addr;
1348 struct nf_conntrack_expect *exp;
1350 DEBUGP("nf_ct_ras: GCF\n");
1352 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1355 /* Registration port is the same as discovery port */
1356 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1357 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1360 /* Avoid RAS expectation loops. A GCF is never expected. */
1361 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1364 /* Need new expect */
1365 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1367 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1368 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1369 IPPROTO_UDP, NULL, &port);
1370 exp->helper = nf_conntrack_helper_ras;
1372 if (nf_conntrack_expect_related(exp) == 0) {
1373 DEBUGP("nf_ct_ras: expect RAS ");
1374 NF_CT_DUMP_TUPLE(&exp->tuple);
1378 nf_conntrack_expect_put(exp);
1383 /****************************************************************************/
1384 static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct,
1385 enum ip_conntrack_info ctinfo,
1386 unsigned char **data, RegistrationRequest *rrq)
1388 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1390 typeof(set_ras_addr_hook) set_ras_addr;
1392 DEBUGP("nf_ct_ras: RRQ\n");
1394 ret = expect_q931(pskb, ct, ctinfo, data,
1395 rrq->callSignalAddress.item,
1396 rrq->callSignalAddress.count);
1400 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1401 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1402 ret = set_ras_addr(pskb, ct, ctinfo, data,
1403 rrq->rasAddress.item,
1404 rrq->rasAddress.count);
1409 if (rrq->options & eRegistrationRequest_timeToLive) {
1410 DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1411 info->timeout = rrq->timeToLive;
1413 info->timeout = default_rrq_ttl;
1418 /****************************************************************************/
1419 static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct,
1420 enum ip_conntrack_info ctinfo,
1421 unsigned char **data, RegistrationConfirm *rcf)
1423 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1424 int dir = CTINFO2DIR(ctinfo);
1426 struct nf_conntrack_expect *exp;
1427 typeof(set_sig_addr_hook) set_sig_addr;
1429 DEBUGP("nf_ct_ras: RCF\n");
1431 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1432 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1433 ret = set_sig_addr(pskb, ct, ctinfo, data,
1434 rcf->callSignalAddress.item,
1435 rcf->callSignalAddress.count);
1440 if (rcf->options & eRegistrationConfirm_timeToLive) {
1441 DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1442 info->timeout = rcf->timeToLive;
1445 if (info->timeout > 0) {
1447 ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
1449 nf_ct_refresh(ct, *pskb, info->timeout * HZ);
1451 /* Set expect timeout */
1452 read_lock_bh(&nf_conntrack_lock);
1453 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1454 info->sig_port[!dir]);
1456 DEBUGP("nf_ct_ras: set Q.931 expect "
1457 "timeout to %u seconds for",
1459 NF_CT_DUMP_TUPLE(&exp->tuple);
1460 set_expect_timeout(exp, info->timeout);
1462 read_unlock_bh(&nf_conntrack_lock);
1468 /****************************************************************************/
1469 static int process_urq(struct sk_buff **pskb, struct nf_conn *ct,
1470 enum ip_conntrack_info ctinfo,
1471 unsigned char **data, UnregistrationRequest *urq)
1473 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1474 int dir = CTINFO2DIR(ctinfo);
1476 typeof(set_sig_addr_hook) set_sig_addr;
1478 DEBUGP("nf_ct_ras: URQ\n");
1480 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1481 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1482 ret = set_sig_addr(pskb, ct, ctinfo, data,
1483 urq->callSignalAddress.item,
1484 urq->callSignalAddress.count);
1489 /* Clear old expect */
1490 nf_ct_remove_expectations(ct);
1491 info->sig_port[dir] = 0;
1492 info->sig_port[!dir] = 0;
1494 /* Give it 30 seconds for UCF or URJ */
1495 nf_ct_refresh(ct, *pskb, 30 * HZ);
1500 /****************************************************************************/
1501 static int process_arq(struct sk_buff **pskb, struct nf_conn *ct,
1502 enum ip_conntrack_info ctinfo,
1503 unsigned char **data, AdmissionRequest *arq)
1505 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1506 int dir = CTINFO2DIR(ctinfo);
1508 union nf_conntrack_address addr;
1509 typeof(set_h225_addr_hook) set_h225_addr;
1511 DEBUGP("nf_ct_ras: ARQ\n");
1513 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1514 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1515 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1517 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1518 port == info->sig_port[dir] &&
1519 set_h225_addr && ct->status & IPS_NAT_MASK) {
1521 return set_h225_addr(pskb, data, 0,
1522 &arq->destCallSignalAddress,
1523 &ct->tuplehash[!dir].tuple.dst.u3,
1524 info->sig_port[!dir]);
1527 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1528 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1530 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1531 set_h225_addr && ct->status & IPS_NAT_MASK) {
1533 return set_h225_addr(pskb, data, 0,
1534 &arq->srcCallSignalAddress,
1535 &ct->tuplehash[!dir].tuple.dst.u3,
1542 /****************************************************************************/
1543 static int process_acf(struct sk_buff **pskb, struct nf_conn *ct,
1544 enum ip_conntrack_info ctinfo,
1545 unsigned char **data, AdmissionConfirm *acf)
1547 int dir = CTINFO2DIR(ctinfo);
1550 union nf_conntrack_address addr;
1551 struct nf_conntrack_expect *exp;
1552 typeof(set_sig_addr_hook) set_sig_addr;
1554 DEBUGP("nf_ct_ras: ACF\n");
1556 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1560 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1562 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1563 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1564 return set_sig_addr(pskb, ct, ctinfo, data,
1565 &acf->destCallSignalAddress, 1);
1569 /* Need new expect */
1570 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1572 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1573 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1574 IPPROTO_TCP, NULL, &port);
1575 exp->flags = NF_CT_EXPECT_PERMANENT;
1576 exp->helper = nf_conntrack_helper_q931;
1578 if (nf_conntrack_expect_related(exp) == 0) {
1579 DEBUGP("nf_ct_ras: expect Q.931 ");
1580 NF_CT_DUMP_TUPLE(&exp->tuple);
1584 nf_conntrack_expect_put(exp);
1589 /****************************************************************************/
1590 static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct,
1591 enum ip_conntrack_info ctinfo,
1592 unsigned char **data, LocationRequest *lrq)
1594 typeof(set_ras_addr_hook) set_ras_addr;
1596 DEBUGP("nf_ct_ras: LRQ\n");
1598 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1599 if (set_ras_addr && ct->status & IPS_NAT_MASK)
1600 return set_ras_addr(pskb, ct, ctinfo, data,
1601 &lrq->replyAddress, 1);
1605 /****************************************************************************/
1606 static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct,
1607 enum ip_conntrack_info ctinfo,
1608 unsigned char **data, LocationConfirm *lcf)
1610 int dir = CTINFO2DIR(ctinfo);
1613 union nf_conntrack_address addr;
1614 struct nf_conntrack_expect *exp;
1616 DEBUGP("nf_ct_ras: LCF\n");
1618 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1622 /* Need new expect for call signal */
1623 if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
1625 nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1626 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1627 IPPROTO_TCP, NULL, &port);
1628 exp->flags = NF_CT_EXPECT_PERMANENT;
1629 exp->helper = nf_conntrack_helper_q931;
1631 if (nf_conntrack_expect_related(exp) == 0) {
1632 DEBUGP("nf_ct_ras: expect Q.931 ");
1633 NF_CT_DUMP_TUPLE(&exp->tuple);
1637 nf_conntrack_expect_put(exp);
1639 /* Ignore rasAddress */
1644 /****************************************************************************/
1645 static int process_irr(struct sk_buff **pskb, struct nf_conn *ct,
1646 enum ip_conntrack_info ctinfo,
1647 unsigned char **data, InfoRequestResponse *irr)
1650 typeof(set_ras_addr_hook) set_ras_addr;
1651 typeof(set_sig_addr_hook) set_sig_addr;
1653 DEBUGP("nf_ct_ras: IRR\n");
1655 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1656 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1657 ret = set_ras_addr(pskb, ct, ctinfo, data,
1658 &irr->rasAddress, 1);
1663 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1664 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1665 ret = set_sig_addr(pskb, ct, ctinfo, data,
1666 irr->callSignalAddress.item,
1667 irr->callSignalAddress.count);
1675 /****************************************************************************/
1676 static int process_ras(struct sk_buff **pskb, struct nf_conn *ct,
1677 enum ip_conntrack_info ctinfo,
1678 unsigned char **data, RasMessage *ras)
1680 switch (ras->choice) {
1681 case eRasMessage_gatekeeperRequest:
1682 return process_grq(pskb, ct, ctinfo, data,
1683 &ras->gatekeeperRequest);
1684 case eRasMessage_gatekeeperConfirm:
1685 return process_gcf(pskb, ct, ctinfo, data,
1686 &ras->gatekeeperConfirm);
1687 case eRasMessage_registrationRequest:
1688 return process_rrq(pskb, ct, ctinfo, data,
1689 &ras->registrationRequest);
1690 case eRasMessage_registrationConfirm:
1691 return process_rcf(pskb, ct, ctinfo, data,
1692 &ras->registrationConfirm);
1693 case eRasMessage_unregistrationRequest:
1694 return process_urq(pskb, ct, ctinfo, data,
1695 &ras->unregistrationRequest);
1696 case eRasMessage_admissionRequest:
1697 return process_arq(pskb, ct, ctinfo, data,
1698 &ras->admissionRequest);
1699 case eRasMessage_admissionConfirm:
1700 return process_acf(pskb, ct, ctinfo, data,
1701 &ras->admissionConfirm);
1702 case eRasMessage_locationRequest:
1703 return process_lrq(pskb, ct, ctinfo, data,
1704 &ras->locationRequest);
1705 case eRasMessage_locationConfirm:
1706 return process_lcf(pskb, ct, ctinfo, data,
1707 &ras->locationConfirm);
1708 case eRasMessage_infoRequestResponse:
1709 return process_irr(pskb, ct, ctinfo, data,
1710 &ras->infoRequestResponse);
1712 DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice);
1719 /****************************************************************************/
1720 static int ras_help(struct sk_buff **pskb, unsigned int protoff,
1721 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1723 static RasMessage ras;
1724 unsigned char *data;
1728 DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len);
1730 spin_lock_bh(&nf_h323_lock);
1733 data = get_udp_data(pskb, protoff, &datalen);
1736 DEBUGP("nf_ct_ras: RAS message len=%d ", datalen);
1737 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1739 /* Decode RAS message */
1740 ret = DecodeRasMessage(data, datalen, &ras);
1742 if (net_ratelimit())
1743 printk("nf_ct_ras: decoding error: %s\n",
1744 ret == H323_ERROR_BOUND ?
1745 "out of bound" : "out of range");
1749 /* Process RAS message */
1750 if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
1754 spin_unlock_bh(&nf_h323_lock);
1758 spin_unlock_bh(&nf_h323_lock);
1759 if (net_ratelimit())
1760 printk("nf_ct_ras: packet dropped\n");
1764 /****************************************************************************/
1765 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1771 .tuple.src.l3num = AF_INET,
1772 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1773 .tuple.dst.protonum = IPPROTO_UDP,
1774 .mask.src.l3num = 0xFFFF,
1775 .mask.src.u.udp.port = __constant_htons(0xFFFF),
1776 .mask.dst.protonum = 0xFF,
1784 .tuple.src.l3num = AF_INET6,
1785 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1786 .tuple.dst.protonum = IPPROTO_UDP,
1787 .mask.src.l3num = 0xFFFF,
1788 .mask.src.u.udp.port = __constant_htons(0xFFFF),
1789 .mask.dst.protonum = 0xFF,
1794 /****************************************************************************/
1795 static void __exit nf_conntrack_h323_fini(void)
1797 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1798 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1799 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1800 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1802 DEBUGP("nf_ct_h323: fini\n");
1805 /****************************************************************************/
1806 static int __init nf_conntrack_h323_init(void)
1810 h323_buffer = kmalloc(65536, GFP_KERNEL);
1813 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1816 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1819 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1822 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1825 DEBUGP("nf_ct_h323: init success\n");
1829 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1831 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1833 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1838 /****************************************************************************/
1839 module_init(nf_conntrack_h323_init);
1840 module_exit(nf_conntrack_h323_fini);
1842 EXPORT_SYMBOL_GPL(get_h225_addr);
1843 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1844 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1845 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1846 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1847 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1848 EXPORT_SYMBOL_GPL(nat_t120_hook);
1849 EXPORT_SYMBOL_GPL(nat_h245_hook);
1850 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1851 EXPORT_SYMBOL_GPL(nat_q931_hook);
1853 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1854 MODULE_DESCRIPTION("H.323 connection tracking helper");
1855 MODULE_LICENSE("GPL");
1856 MODULE_ALIAS("ip_conntrack_h323");