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>
35 static unsigned int default_rrq_ttl __read_mostly = 300;
36 module_param(default_rrq_ttl, uint, 0600);
37 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
39 static int gkrouted_only __read_mostly = 1;
40 module_param(gkrouted_only, int, 0600);
41 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
43 static int callforward_filter __read_mostly = 1;
44 module_param(callforward_filter, bool, 0600);
45 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
46 "if both endpoints are on different sides "
47 "(determined by routing information)");
50 int (*set_h245_addr_hook) (struct sk_buff *skb,
51 unsigned char **data, int dataoff,
52 H245_TransportAddress *taddr,
53 union nf_conntrack_address *addr, __be16 port)
55 int (*set_h225_addr_hook) (struct sk_buff *skb,
56 unsigned char **data, int dataoff,
57 TransportAddress *taddr,
58 union nf_conntrack_address *addr, __be16 port)
60 int (*set_sig_addr_hook) (struct sk_buff *skb,
62 enum ip_conntrack_info ctinfo,
64 TransportAddress *taddr, int count) __read_mostly;
65 int (*set_ras_addr_hook) (struct sk_buff *skb,
67 enum ip_conntrack_info ctinfo,
69 TransportAddress *taddr, int count) __read_mostly;
70 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
72 enum ip_conntrack_info ctinfo,
73 unsigned char **data, int dataoff,
74 H245_TransportAddress *taddr,
75 __be16 port, __be16 rtp_port,
76 struct nf_conntrack_expect *rtp_exp,
77 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
78 int (*nat_t120_hook) (struct sk_buff *skb,
80 enum ip_conntrack_info ctinfo,
81 unsigned char **data, int dataoff,
82 H245_TransportAddress *taddr, __be16 port,
83 struct nf_conntrack_expect *exp) __read_mostly;
84 int (*nat_h245_hook) (struct sk_buff *skb,
86 enum ip_conntrack_info ctinfo,
87 unsigned char **data, int dataoff,
88 TransportAddress *taddr, __be16 port,
89 struct nf_conntrack_expect *exp) __read_mostly;
90 int (*nat_callforwarding_hook) (struct sk_buff *skb,
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_q931_hook) (struct sk_buff *skb,
98 enum ip_conntrack_info ctinfo,
99 unsigned char **data, TransportAddress *taddr, int idx,
100 __be16 port, struct nf_conntrack_expect *exp)
103 static DEFINE_SPINLOCK(nf_h323_lock);
104 static char *h323_buffer;
106 static struct nf_conntrack_helper nf_conntrack_helper_h245;
107 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
108 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
110 /****************************************************************************/
111 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
112 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
113 unsigned char **data, int *datalen, int *dataoff)
115 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
116 int dir = CTINFO2DIR(ctinfo);
117 struct tcphdr _tcph, *th;
125 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
129 /* Get TCP data offset */
130 tcpdataoff = protoff + th->doff * 4;
132 /* Get TCP data length */
133 tcpdatalen = skb->len - tcpdataoff;
134 if (tcpdatalen <= 0) /* No TCP data */
137 if (*data == NULL) { /* first TPKT */
138 /* Get first TPKT pointer */
139 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
141 BUG_ON(tpkt == NULL);
143 /* Validate TPKT identifier */
144 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
145 /* Netmeeting sends TPKT header and data separately */
146 if (info->tpkt_len[dir] > 0) {
147 pr_debug("nf_ct_h323: previous packet "
148 "indicated separate TPKT data of %hu "
149 "bytes\n", info->tpkt_len[dir]);
150 if (info->tpkt_len[dir] <= tcpdatalen) {
151 /* Yes, there was a TPKT header
154 *datalen = info->tpkt_len[dir];
159 /* Fragmented TPKT */
160 pr_debug("nf_ct_h323: fragmented TPKT\n");
164 /* It is not even a TPKT */
168 } else { /* Next TPKT */
169 tpktoff = *dataoff + *datalen;
170 tcpdatalen -= tpktoff;
171 if (tcpdatalen <= 4) /* No more TPKT */
173 tpkt = *data + *datalen;
175 /* Validate TPKT identifier */
176 if (tpkt[0] != 0x03 || tpkt[1] != 0)
180 /* Validate TPKT length */
181 tpktlen = tpkt[2] * 256 + tpkt[3];
184 if (tpktlen > tcpdatalen) {
185 if (tcpdatalen == 4) { /* Separate TPKT header */
186 /* Netmeeting sends TPKT header and data separately */
187 pr_debug("nf_ct_h323: separate TPKT header indicates "
188 "there will be TPKT data of %hu bytes\n",
190 info->tpkt_len[dir] = tpktlen - 4;
195 printk("nf_ct_h323: incomplete TPKT (fragmented?)\n");
199 /* This is the encapsulated data */
201 *datalen = tpktlen - 4;
202 *dataoff = tpktoff + 4;
205 /* Clear TPKT length */
206 info->tpkt_len[dir] = 0;
210 info->tpkt_len[dir] = 0;
214 /****************************************************************************/
215 static int get_h245_addr(struct nf_conn *ct, unsigned char *data,
216 H245_TransportAddress *taddr,
217 union nf_conntrack_address *addr, __be16 *port)
220 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
223 if (taddr->choice != eH245_TransportAddress_unicastAddress)
226 switch (taddr->unicastAddress.choice) {
227 case eUnicastAddress_iPAddress:
228 if (family != AF_INET)
230 p = data + taddr->unicastAddress.iPAddress.network;
233 case eUnicastAddress_iP6Address:
234 if (family != AF_INET6)
236 p = data + taddr->unicastAddress.iP6Address.network;
243 memcpy(addr, p, len);
244 memset((void *)addr + len, 0, sizeof(*addr) - len);
245 memcpy(port, p + len, sizeof(__be16));
250 /****************************************************************************/
251 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
252 enum ip_conntrack_info ctinfo,
253 unsigned char **data, int dataoff,
254 H245_TransportAddress *taddr)
256 int dir = CTINFO2DIR(ctinfo);
259 __be16 rtp_port, rtcp_port;
260 union nf_conntrack_address addr;
261 struct nf_conntrack_expect *rtp_exp;
262 struct nf_conntrack_expect *rtcp_exp;
263 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
265 /* Read RTP or RTCP address */
266 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
267 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
271 /* RTP port is even */
274 rtcp_port = htons(ntohs(port) + 1);
276 /* Create expect for RTP */
277 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
279 nf_ct_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
280 &ct->tuplehash[!dir].tuple.src.u3,
281 &ct->tuplehash[!dir].tuple.dst.u3,
282 IPPROTO_UDP, NULL, &rtp_port);
284 /* Create expect for RTCP */
285 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
286 nf_ct_expect_put(rtp_exp);
289 nf_ct_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
290 &ct->tuplehash[!dir].tuple.src.u3,
291 &ct->tuplehash[!dir].tuple.dst.u3,
292 IPPROTO_UDP, NULL, &rtcp_port);
294 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
295 &ct->tuplehash[!dir].tuple.dst.u3,
296 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
297 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
298 ct->status & IPS_NAT_MASK) {
300 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
301 taddr, port, rtp_port, rtp_exp, rtcp_exp);
302 } else { /* Conntrack only */
303 if (nf_ct_expect_related(rtp_exp) == 0) {
304 if (nf_ct_expect_related(rtcp_exp) == 0) {
305 pr_debug("nf_ct_h323: expect RTP ");
306 NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
307 pr_debug("nf_ct_h323: expect RTCP ");
308 NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
310 nf_ct_unexpect_related(rtp_exp);
317 nf_ct_expect_put(rtp_exp);
318 nf_ct_expect_put(rtcp_exp);
323 /****************************************************************************/
324 static int expect_t120(struct sk_buff *skb,
326 enum ip_conntrack_info ctinfo,
327 unsigned char **data, int dataoff,
328 H245_TransportAddress *taddr)
330 int dir = CTINFO2DIR(ctinfo);
333 union nf_conntrack_address addr;
334 struct nf_conntrack_expect *exp;
335 typeof(nat_t120_hook) nat_t120;
337 /* Read T.120 address */
338 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
339 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
343 /* Create expect for T.120 connections */
344 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
346 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
347 &ct->tuplehash[!dir].tuple.src.u3,
348 &ct->tuplehash[!dir].tuple.dst.u3,
349 IPPROTO_TCP, NULL, &port);
350 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
352 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
353 &ct->tuplehash[!dir].tuple.dst.u3,
354 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
355 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
356 ct->status & IPS_NAT_MASK) {
358 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
360 } else { /* Conntrack only */
361 if (nf_ct_expect_related(exp) == 0) {
362 pr_debug("nf_ct_h323: expect T.120 ");
363 NF_CT_DUMP_TUPLE(&exp->tuple);
368 nf_ct_expect_put(exp);
373 /****************************************************************************/
374 static int process_h245_channel(struct sk_buff *skb,
376 enum ip_conntrack_info ctinfo,
377 unsigned char **data, int dataoff,
378 H2250LogicalChannelParameters *channel)
382 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
384 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
385 &channel->mediaChannel);
391 options & eH2250LogicalChannelParameters_mediaControlChannel) {
393 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
394 &channel->mediaControlChannel);
402 /****************************************************************************/
403 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
404 enum ip_conntrack_info ctinfo,
405 unsigned char **data, int dataoff,
406 OpenLogicalChannel *olc)
410 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
412 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
413 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
415 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
417 forwardLogicalChannelParameters.
419 h2250LogicalChannelParameters);
425 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
426 (olc->reverseLogicalChannelParameters.options &
427 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
428 && (olc->reverseLogicalChannelParameters.multiplexParameters.
430 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
433 process_h245_channel(skb, ct, ctinfo, data, dataoff,
435 reverseLogicalChannelParameters.
437 h2250LogicalChannelParameters);
442 if ((olc->options & eOpenLogicalChannel_separateStack) &&
443 olc->forwardLogicalChannelParameters.dataType.choice ==
445 olc->forwardLogicalChannelParameters.dataType.data.application.
446 choice == eDataApplicationCapability_application_t120 &&
447 olc->forwardLogicalChannelParameters.dataType.data.application.
448 t120.choice == eDataProtocolCapability_separateLANStack &&
449 olc->separateStack.networkAddress.choice ==
450 eNetworkAccessParameters_networkAddress_localAreaAddress) {
451 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
452 &olc->separateStack.networkAddress.
461 /****************************************************************************/
462 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
463 enum ip_conntrack_info ctinfo,
464 unsigned char **data, int dataoff,
465 OpenLogicalChannelAck *olca)
467 H2250LogicalChannelAckParameters *ack;
470 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
473 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
474 (olca->reverseLogicalChannelParameters.options &
475 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
476 && (olca->reverseLogicalChannelParameters.multiplexParameters.
478 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
480 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
482 reverseLogicalChannelParameters.
484 h2250LogicalChannelParameters);
490 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
491 (olca->forwardMultiplexAckParameters.choice ==
492 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
494 ack = &olca->forwardMultiplexAckParameters.
495 h2250LogicalChannelAckParameters;
497 eH2250LogicalChannelAckParameters_mediaChannel) {
499 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
506 eH2250LogicalChannelAckParameters_mediaControlChannel) {
508 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
509 &ack->mediaControlChannel);
515 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
516 olca->separateStack.networkAddress.choice ==
517 eNetworkAccessParameters_networkAddress_localAreaAddress) {
518 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
519 &olca->separateStack.networkAddress.
528 /****************************************************************************/
529 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
530 enum ip_conntrack_info ctinfo,
531 unsigned char **data, int dataoff,
532 MultimediaSystemControlMessage *mscm)
534 switch (mscm->choice) {
535 case eMultimediaSystemControlMessage_request:
536 if (mscm->request.choice ==
537 eRequestMessage_openLogicalChannel) {
538 return process_olc(skb, ct, ctinfo, data, dataoff,
539 &mscm->request.openLogicalChannel);
541 pr_debug("nf_ct_h323: H.245 Request %d\n",
542 mscm->request.choice);
544 case eMultimediaSystemControlMessage_response:
545 if (mscm->response.choice ==
546 eResponseMessage_openLogicalChannelAck) {
547 return process_olca(skb, ct, ctinfo, data, dataoff,
549 openLogicalChannelAck);
551 pr_debug("nf_ct_h323: H.245 Response %d\n",
552 mscm->response.choice);
555 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
562 /****************************************************************************/
563 static int h245_help(struct sk_buff *skb, unsigned int protoff,
564 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
566 static MultimediaSystemControlMessage mscm;
567 unsigned char *data = NULL;
572 /* Until there's been traffic both ways, don't look in packets. */
573 if (ctinfo != IP_CT_ESTABLISHED &&
574 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
577 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
579 spin_lock_bh(&nf_h323_lock);
581 /* Process each TPKT */
582 while (get_tpkt_data(skb, protoff, ct, ctinfo,
583 &data, &datalen, &dataoff)) {
584 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
585 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
587 /* Decode H.245 signal */
588 ret = DecodeMultimediaSystemControlMessage(data, datalen,
591 pr_debug("nf_ct_h245: decoding error: %s\n",
592 ret == H323_ERROR_BOUND ?
593 "out of bound" : "out of range");
594 /* We don't drop when decoding error */
598 /* Process H.245 signal */
599 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
603 spin_unlock_bh(&nf_h323_lock);
607 spin_unlock_bh(&nf_h323_lock);
609 printk("nf_ct_h245: packet dropped\n");
613 /****************************************************************************/
614 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
617 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
619 .tuple.dst.protonum = IPPROTO_UDP,
623 /****************************************************************************/
624 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
625 TransportAddress *taddr,
626 union nf_conntrack_address *addr, __be16 *port)
629 int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
632 switch (taddr->choice) {
633 case eTransportAddress_ipAddress:
634 if (family != AF_INET)
636 p = data + taddr->ipAddress.ip;
639 case eTransportAddress_ip6Address:
640 if (family != AF_INET6)
642 p = data + taddr->ip6Address.ip;
649 memcpy(addr, p, len);
650 memset((void *)addr + len, 0, sizeof(*addr) - len);
651 memcpy(port, p + len, sizeof(__be16));
656 /****************************************************************************/
657 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
658 enum ip_conntrack_info ctinfo,
659 unsigned char **data, int dataoff,
660 TransportAddress *taddr)
662 int dir = CTINFO2DIR(ctinfo);
665 union nf_conntrack_address addr;
666 struct nf_conntrack_expect *exp;
667 typeof(nat_h245_hook) nat_h245;
669 /* Read h245Address */
670 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
671 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
675 /* Create expect for h245 connection */
676 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
678 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
679 &ct->tuplehash[!dir].tuple.src.u3,
680 &ct->tuplehash[!dir].tuple.dst.u3,
681 IPPROTO_TCP, NULL, &port);
682 exp->helper = &nf_conntrack_helper_h245;
684 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
685 &ct->tuplehash[!dir].tuple.dst.u3,
686 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
687 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
688 ct->status & IPS_NAT_MASK) {
690 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
692 } else { /* Conntrack only */
693 if (nf_ct_expect_related(exp) == 0) {
694 pr_debug("nf_ct_q931: expect H.245 ");
695 NF_CT_DUMP_TUPLE(&exp->tuple);
700 nf_ct_expect_put(exp);
705 /* If the calling party is on the same side of the forward-to party,
706 * we don't need to track the second call */
707 static int callforward_do_filter(union nf_conntrack_address *src,
708 union nf_conntrack_address *dst,
711 const struct nf_afinfo *afinfo;
712 struct flowi fl1, fl2;
715 /* rcu_read_lock()ed by nf_hook_slow() */
716 afinfo = nf_get_afinfo(family);
720 memset(&fl1, 0, sizeof(fl1));
721 memset(&fl2, 0, sizeof(fl2));
725 struct rtable *rt1, *rt2;
727 fl1.fl4_dst = src->ip;
728 fl2.fl4_dst = dst->ip;
729 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
730 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
731 if (rt1->rt_gateway == rt2->rt_gateway &&
732 rt1->u.dst.dev == rt2->u.dst.dev)
734 dst_release(&rt2->u.dst);
736 dst_release(&rt1->u.dst);
740 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
741 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
743 struct rt6_info *rt1, *rt2;
745 memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
746 memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
747 if (!afinfo->route((struct dst_entry **)&rt1, &fl1)) {
748 if (!afinfo->route((struct dst_entry **)&rt2, &fl2)) {
749 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
750 sizeof(rt1->rt6i_gateway)) &&
751 rt1->u.dst.dev == rt2->u.dst.dev)
753 dst_release(&rt2->u.dst);
755 dst_release(&rt1->u.dst);
765 /****************************************************************************/
766 static int expect_callforwarding(struct sk_buff *skb,
768 enum ip_conntrack_info ctinfo,
769 unsigned char **data, int dataoff,
770 TransportAddress *taddr)
772 int dir = CTINFO2DIR(ctinfo);
775 union nf_conntrack_address addr;
776 struct nf_conntrack_expect *exp;
777 typeof(nat_callforwarding_hook) nat_callforwarding;
779 /* Read alternativeAddress */
780 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
783 /* If the calling party is on the same side of the forward-to party,
784 * we don't need to track the second call */
785 if (callforward_filter &&
786 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
787 ct->tuplehash[!dir].tuple.src.l3num)) {
788 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
792 /* Create expect for the second call leg */
793 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
795 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
796 &ct->tuplehash[!dir].tuple.src.u3, &addr,
797 IPPROTO_TCP, NULL, &port);
798 exp->helper = nf_conntrack_helper_q931;
800 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
801 &ct->tuplehash[!dir].tuple.dst.u3,
802 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
803 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
804 ct->status & IPS_NAT_MASK) {
806 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
808 } else { /* Conntrack only */
809 if (nf_ct_expect_related(exp) == 0) {
810 pr_debug("nf_ct_q931: expect Call Forwarding ");
811 NF_CT_DUMP_TUPLE(&exp->tuple);
816 nf_ct_expect_put(exp);
821 /****************************************************************************/
822 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
823 enum ip_conntrack_info ctinfo,
824 unsigned char **data, int dataoff,
827 int dir = CTINFO2DIR(ctinfo);
831 union nf_conntrack_address addr;
832 typeof(set_h225_addr_hook) set_h225_addr;
834 pr_debug("nf_ct_q931: Setup\n");
836 if (setup->options & eSetup_UUIE_h245Address) {
837 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
838 &setup->h245Address);
843 set_h225_addr = rcu_dereference(set_h225_addr_hook);
844 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
845 (set_h225_addr) && ct->status && IPS_NAT_MASK &&
846 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
848 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
849 pr_debug("nf_ct_q931: set destCallSignalAddress "
850 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
851 NIP6(*(struct in6_addr *)&addr), ntohs(port),
852 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
853 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
854 ret = set_h225_addr(skb, data, dataoff,
855 &setup->destCallSignalAddress,
856 &ct->tuplehash[!dir].tuple.src.u3,
857 ct->tuplehash[!dir].tuple.src.u.tcp.port);
862 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
863 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
864 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
866 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
867 pr_debug("nf_ct_q931: set sourceCallSignalAddress "
868 NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
869 NIP6(*(struct in6_addr *)&addr), ntohs(port),
870 NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
871 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
872 ret = set_h225_addr(skb, data, dataoff,
873 &setup->sourceCallSignalAddress,
874 &ct->tuplehash[!dir].tuple.dst.u3,
875 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
880 if (setup->options & eSetup_UUIE_fastStart) {
881 for (i = 0; i < setup->fastStart.count; i++) {
882 ret = process_olc(skb, ct, ctinfo, data, dataoff,
883 &setup->fastStart.item[i]);
892 /****************************************************************************/
893 static int process_callproceeding(struct sk_buff *skb,
895 enum ip_conntrack_info ctinfo,
896 unsigned char **data, int dataoff,
897 CallProceeding_UUIE *callproc)
902 pr_debug("nf_ct_q931: CallProceeding\n");
904 if (callproc->options & eCallProceeding_UUIE_h245Address) {
905 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
906 &callproc->h245Address);
911 if (callproc->options & eCallProceeding_UUIE_fastStart) {
912 for (i = 0; i < callproc->fastStart.count; i++) {
913 ret = process_olc(skb, ct, ctinfo, data, dataoff,
914 &callproc->fastStart.item[i]);
923 /****************************************************************************/
924 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
925 enum ip_conntrack_info ctinfo,
926 unsigned char **data, int dataoff,
927 Connect_UUIE *connect)
932 pr_debug("nf_ct_q931: Connect\n");
934 if (connect->options & eConnect_UUIE_h245Address) {
935 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
936 &connect->h245Address);
941 if (connect->options & eConnect_UUIE_fastStart) {
942 for (i = 0; i < connect->fastStart.count; i++) {
943 ret = process_olc(skb, ct, ctinfo, data, dataoff,
944 &connect->fastStart.item[i]);
953 /****************************************************************************/
954 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
955 enum ip_conntrack_info ctinfo,
956 unsigned char **data, int dataoff,
957 Alerting_UUIE *alert)
962 pr_debug("nf_ct_q931: Alerting\n");
964 if (alert->options & eAlerting_UUIE_h245Address) {
965 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
966 &alert->h245Address);
971 if (alert->options & eAlerting_UUIE_fastStart) {
972 for (i = 0; i < alert->fastStart.count; i++) {
973 ret = process_olc(skb, ct, ctinfo, data, dataoff,
974 &alert->fastStart.item[i]);
983 /****************************************************************************/
984 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
985 enum ip_conntrack_info ctinfo,
986 unsigned char **data, int dataoff,
987 Facility_UUIE *facility)
992 pr_debug("nf_ct_q931: Facility\n");
994 if (facility->reason.choice == eFacilityReason_callForwarded) {
995 if (facility->options & eFacility_UUIE_alternativeAddress)
996 return expect_callforwarding(skb, ct, ctinfo, data,
1003 if (facility->options & eFacility_UUIE_h245Address) {
1004 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1005 &facility->h245Address);
1010 if (facility->options & eFacility_UUIE_fastStart) {
1011 for (i = 0; i < facility->fastStart.count; i++) {
1012 ret = process_olc(skb, ct, ctinfo, data, dataoff,
1013 &facility->fastStart.item[i]);
1022 /****************************************************************************/
1023 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1024 enum ip_conntrack_info ctinfo,
1025 unsigned char **data, int dataoff,
1026 Progress_UUIE *progress)
1031 pr_debug("nf_ct_q931: Progress\n");
1033 if (progress->options & eProgress_UUIE_h245Address) {
1034 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1035 &progress->h245Address);
1040 if (progress->options & eProgress_UUIE_fastStart) {
1041 for (i = 0; i < progress->fastStart.count; i++) {
1042 ret = process_olc(skb, ct, ctinfo, data, dataoff,
1043 &progress->fastStart.item[i]);
1052 /****************************************************************************/
1053 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1054 enum ip_conntrack_info ctinfo,
1055 unsigned char **data, int dataoff, Q931 *q931)
1057 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1061 switch (pdu->h323_message_body.choice) {
1062 case eH323_UU_PDU_h323_message_body_setup:
1063 ret = process_setup(skb, ct, ctinfo, data, dataoff,
1064 &pdu->h323_message_body.setup);
1066 case eH323_UU_PDU_h323_message_body_callProceeding:
1067 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
1068 &pdu->h323_message_body.
1071 case eH323_UU_PDU_h323_message_body_connect:
1072 ret = process_connect(skb, ct, ctinfo, data, dataoff,
1073 &pdu->h323_message_body.connect);
1075 case eH323_UU_PDU_h323_message_body_alerting:
1076 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
1077 &pdu->h323_message_body.alerting);
1079 case eH323_UU_PDU_h323_message_body_facility:
1080 ret = process_facility(skb, ct, ctinfo, data, dataoff,
1081 &pdu->h323_message_body.facility);
1083 case eH323_UU_PDU_h323_message_body_progress:
1084 ret = process_progress(skb, ct, ctinfo, data, dataoff,
1085 &pdu->h323_message_body.progress);
1088 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1089 pdu->h323_message_body.choice);
1096 if (pdu->options & eH323_UU_PDU_h245Control) {
1097 for (i = 0; i < pdu->h245Control.count; i++) {
1098 ret = process_h245(skb, ct, ctinfo, data, dataoff,
1099 &pdu->h245Control.item[i]);
1108 /****************************************************************************/
1109 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1110 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1113 unsigned char *data = NULL;
1118 /* Until there's been traffic both ways, don't look in packets. */
1119 if (ctinfo != IP_CT_ESTABLISHED &&
1120 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1123 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1125 spin_lock_bh(&nf_h323_lock);
1127 /* Process each TPKT */
1128 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1129 &data, &datalen, &dataoff)) {
1130 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1131 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1133 /* Decode Q.931 signal */
1134 ret = DecodeQ931(data, datalen, &q931);
1136 pr_debug("nf_ct_q931: decoding error: %s\n",
1137 ret == H323_ERROR_BOUND ?
1138 "out of bound" : "out of range");
1139 /* We don't drop when decoding error */
1143 /* Process Q.931 signal */
1144 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
1148 spin_unlock_bh(&nf_h323_lock);
1152 spin_unlock_bh(&nf_h323_lock);
1153 if (net_ratelimit())
1154 printk("nf_ct_q931: packet dropped\n");
1158 /****************************************************************************/
1159 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1163 /* T.120 and H.245 */
1164 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1166 .tuple.src.l3num = AF_INET,
1167 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1168 .tuple.dst.protonum = IPPROTO_TCP,
1174 /* T.120 and H.245 */
1175 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1177 .tuple.src.l3num = AF_INET6,
1178 .tuple.src.u.tcp.port = __constant_htons(Q931_PORT),
1179 .tuple.dst.protonum = IPPROTO_TCP,
1184 /****************************************************************************/
1185 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1188 struct udphdr _uh, *uh;
1191 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1194 dataoff = protoff + sizeof(_uh);
1195 if (dataoff >= skb->len)
1197 *datalen = skb->len - dataoff;
1198 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1201 /****************************************************************************/
1202 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1203 union nf_conntrack_address *addr,
1206 struct nf_conntrack_expect *exp;
1207 struct nf_conntrack_tuple tuple;
1209 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1210 tuple.src.u.tcp.port = 0;
1211 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1212 tuple.dst.u.tcp.port = port;
1213 tuple.dst.protonum = IPPROTO_TCP;
1215 exp = __nf_ct_expect_find(&tuple);
1216 if (exp && exp->master == ct)
1221 /****************************************************************************/
1222 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1225 if (!exp || !del_timer(&exp->timeout))
1228 exp->timeout.expires = jiffies + timeout * HZ;
1229 add_timer(&exp->timeout);
1234 /****************************************************************************/
1235 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1236 enum ip_conntrack_info ctinfo,
1237 unsigned char **data,
1238 TransportAddress *taddr, int count)
1240 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1241 int dir = CTINFO2DIR(ctinfo);
1245 union nf_conntrack_address addr;
1246 struct nf_conntrack_expect *exp;
1247 typeof(nat_q931_hook) nat_q931;
1249 /* Look for the first related address */
1250 for (i = 0; i < count; i++) {
1251 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1252 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1253 sizeof(addr)) == 0 && port != 0)
1257 if (i >= count) /* Not found */
1260 /* Create expect for Q.931 */
1261 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1263 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1264 gkrouted_only ? /* only accept calls from GK? */
1265 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1266 &ct->tuplehash[!dir].tuple.dst.u3,
1267 IPPROTO_TCP, NULL, &port);
1268 exp->helper = nf_conntrack_helper_q931;
1269 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1271 nat_q931 = rcu_dereference(nat_q931_hook);
1272 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
1273 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
1274 } else { /* Conntrack only */
1275 if (nf_ct_expect_related(exp) == 0) {
1276 pr_debug("nf_ct_ras: expect Q.931 ");
1277 NF_CT_DUMP_TUPLE(&exp->tuple);
1279 /* Save port for looking up expect in processing RCF */
1280 info->sig_port[dir] = port;
1285 nf_ct_expect_put(exp);
1290 /****************************************************************************/
1291 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1292 enum ip_conntrack_info ctinfo,
1293 unsigned char **data, GatekeeperRequest *grq)
1295 typeof(set_ras_addr_hook) set_ras_addr;
1297 pr_debug("nf_ct_ras: GRQ\n");
1299 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1300 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
1301 return set_ras_addr(skb, ct, ctinfo, data,
1302 &grq->rasAddress, 1);
1306 /****************************************************************************/
1307 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1308 enum ip_conntrack_info ctinfo,
1309 unsigned char **data, GatekeeperConfirm *gcf)
1311 int dir = CTINFO2DIR(ctinfo);
1314 union nf_conntrack_address addr;
1315 struct nf_conntrack_expect *exp;
1317 pr_debug("nf_ct_ras: GCF\n");
1319 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1322 /* Registration port is the same as discovery port */
1323 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1324 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1327 /* Avoid RAS expectation loops. A GCF is never expected. */
1328 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1331 /* Need new expect */
1332 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1334 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1335 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1336 IPPROTO_UDP, NULL, &port);
1337 exp->helper = nf_conntrack_helper_ras;
1339 if (nf_ct_expect_related(exp) == 0) {
1340 pr_debug("nf_ct_ras: expect RAS ");
1341 NF_CT_DUMP_TUPLE(&exp->tuple);
1345 nf_ct_expect_put(exp);
1350 /****************************************************************************/
1351 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1352 enum ip_conntrack_info ctinfo,
1353 unsigned char **data, RegistrationRequest *rrq)
1355 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1357 typeof(set_ras_addr_hook) set_ras_addr;
1359 pr_debug("nf_ct_ras: RRQ\n");
1361 ret = expect_q931(skb, ct, ctinfo, data,
1362 rrq->callSignalAddress.item,
1363 rrq->callSignalAddress.count);
1367 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1368 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1369 ret = set_ras_addr(skb, ct, ctinfo, data,
1370 rrq->rasAddress.item,
1371 rrq->rasAddress.count);
1376 if (rrq->options & eRegistrationRequest_timeToLive) {
1377 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1378 info->timeout = rrq->timeToLive;
1380 info->timeout = default_rrq_ttl;
1385 /****************************************************************************/
1386 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1387 enum ip_conntrack_info ctinfo,
1388 unsigned char **data, RegistrationConfirm *rcf)
1390 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1391 int dir = CTINFO2DIR(ctinfo);
1393 struct nf_conntrack_expect *exp;
1394 typeof(set_sig_addr_hook) set_sig_addr;
1396 pr_debug("nf_ct_ras: RCF\n");
1398 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1399 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1400 ret = set_sig_addr(skb, ct, ctinfo, data,
1401 rcf->callSignalAddress.item,
1402 rcf->callSignalAddress.count);
1407 if (rcf->options & eRegistrationConfirm_timeToLive) {
1408 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1409 info->timeout = rcf->timeToLive;
1412 if (info->timeout > 0) {
1413 pr_debug("nf_ct_ras: set RAS connection timeout to "
1414 "%u seconds\n", info->timeout);
1415 nf_ct_refresh(ct, skb, info->timeout * HZ);
1417 /* Set expect timeout */
1418 read_lock_bh(&nf_conntrack_lock);
1419 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1420 info->sig_port[!dir]);
1422 pr_debug("nf_ct_ras: set Q.931 expect "
1423 "timeout to %u seconds for",
1425 NF_CT_DUMP_TUPLE(&exp->tuple);
1426 set_expect_timeout(exp, info->timeout);
1428 read_unlock_bh(&nf_conntrack_lock);
1434 /****************************************************************************/
1435 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1436 enum ip_conntrack_info ctinfo,
1437 unsigned char **data, UnregistrationRequest *urq)
1439 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1440 int dir = CTINFO2DIR(ctinfo);
1442 typeof(set_sig_addr_hook) set_sig_addr;
1444 pr_debug("nf_ct_ras: URQ\n");
1446 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1447 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1448 ret = set_sig_addr(skb, ct, ctinfo, data,
1449 urq->callSignalAddress.item,
1450 urq->callSignalAddress.count);
1455 /* Clear old expect */
1456 nf_ct_remove_expectations(ct);
1457 info->sig_port[dir] = 0;
1458 info->sig_port[!dir] = 0;
1460 /* Give it 30 seconds for UCF or URJ */
1461 nf_ct_refresh(ct, skb, 30 * HZ);
1466 /****************************************************************************/
1467 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1468 enum ip_conntrack_info ctinfo,
1469 unsigned char **data, AdmissionRequest *arq)
1471 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1472 int dir = CTINFO2DIR(ctinfo);
1474 union nf_conntrack_address addr;
1475 typeof(set_h225_addr_hook) set_h225_addr;
1477 pr_debug("nf_ct_ras: ARQ\n");
1479 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1480 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1481 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1483 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1484 port == info->sig_port[dir] &&
1485 set_h225_addr && ct->status & IPS_NAT_MASK) {
1487 return set_h225_addr(skb, data, 0,
1488 &arq->destCallSignalAddress,
1489 &ct->tuplehash[!dir].tuple.dst.u3,
1490 info->sig_port[!dir]);
1493 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1494 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1496 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1497 set_h225_addr && ct->status & IPS_NAT_MASK) {
1499 return set_h225_addr(skb, data, 0,
1500 &arq->srcCallSignalAddress,
1501 &ct->tuplehash[!dir].tuple.dst.u3,
1508 /****************************************************************************/
1509 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1510 enum ip_conntrack_info ctinfo,
1511 unsigned char **data, AdmissionConfirm *acf)
1513 int dir = CTINFO2DIR(ctinfo);
1516 union nf_conntrack_address addr;
1517 struct nf_conntrack_expect *exp;
1518 typeof(set_sig_addr_hook) set_sig_addr;
1520 pr_debug("nf_ct_ras: ACF\n");
1522 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1526 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1528 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1529 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1530 return set_sig_addr(skb, ct, ctinfo, data,
1531 &acf->destCallSignalAddress, 1);
1535 /* Need new expect */
1536 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1538 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1539 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1540 IPPROTO_TCP, NULL, &port);
1541 exp->flags = NF_CT_EXPECT_PERMANENT;
1542 exp->helper = nf_conntrack_helper_q931;
1544 if (nf_ct_expect_related(exp) == 0) {
1545 pr_debug("nf_ct_ras: expect Q.931 ");
1546 NF_CT_DUMP_TUPLE(&exp->tuple);
1550 nf_ct_expect_put(exp);
1555 /****************************************************************************/
1556 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1557 enum ip_conntrack_info ctinfo,
1558 unsigned char **data, LocationRequest *lrq)
1560 typeof(set_ras_addr_hook) set_ras_addr;
1562 pr_debug("nf_ct_ras: LRQ\n");
1564 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1565 if (set_ras_addr && ct->status & IPS_NAT_MASK)
1566 return set_ras_addr(skb, ct, ctinfo, data,
1567 &lrq->replyAddress, 1);
1571 /****************************************************************************/
1572 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1573 enum ip_conntrack_info ctinfo,
1574 unsigned char **data, LocationConfirm *lcf)
1576 int dir = CTINFO2DIR(ctinfo);
1579 union nf_conntrack_address addr;
1580 struct nf_conntrack_expect *exp;
1582 pr_debug("nf_ct_ras: LCF\n");
1584 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1588 /* Need new expect for call signal */
1589 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1591 nf_ct_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
1592 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1593 IPPROTO_TCP, NULL, &port);
1594 exp->flags = NF_CT_EXPECT_PERMANENT;
1595 exp->helper = nf_conntrack_helper_q931;
1597 if (nf_ct_expect_related(exp) == 0) {
1598 pr_debug("nf_ct_ras: expect Q.931 ");
1599 NF_CT_DUMP_TUPLE(&exp->tuple);
1603 nf_ct_expect_put(exp);
1605 /* Ignore rasAddress */
1610 /****************************************************************************/
1611 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1612 enum ip_conntrack_info ctinfo,
1613 unsigned char **data, InfoRequestResponse *irr)
1616 typeof(set_ras_addr_hook) set_ras_addr;
1617 typeof(set_sig_addr_hook) set_sig_addr;
1619 pr_debug("nf_ct_ras: IRR\n");
1621 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1622 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1623 ret = set_ras_addr(skb, ct, ctinfo, data,
1624 &irr->rasAddress, 1);
1629 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1630 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1631 ret = set_sig_addr(skb, ct, ctinfo, data,
1632 irr->callSignalAddress.item,
1633 irr->callSignalAddress.count);
1641 /****************************************************************************/
1642 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1643 enum ip_conntrack_info ctinfo,
1644 unsigned char **data, RasMessage *ras)
1646 switch (ras->choice) {
1647 case eRasMessage_gatekeeperRequest:
1648 return process_grq(skb, ct, ctinfo, data,
1649 &ras->gatekeeperRequest);
1650 case eRasMessage_gatekeeperConfirm:
1651 return process_gcf(skb, ct, ctinfo, data,
1652 &ras->gatekeeperConfirm);
1653 case eRasMessage_registrationRequest:
1654 return process_rrq(skb, ct, ctinfo, data,
1655 &ras->registrationRequest);
1656 case eRasMessage_registrationConfirm:
1657 return process_rcf(skb, ct, ctinfo, data,
1658 &ras->registrationConfirm);
1659 case eRasMessage_unregistrationRequest:
1660 return process_urq(skb, ct, ctinfo, data,
1661 &ras->unregistrationRequest);
1662 case eRasMessage_admissionRequest:
1663 return process_arq(skb, ct, ctinfo, data,
1664 &ras->admissionRequest);
1665 case eRasMessage_admissionConfirm:
1666 return process_acf(skb, ct, ctinfo, data,
1667 &ras->admissionConfirm);
1668 case eRasMessage_locationRequest:
1669 return process_lrq(skb, ct, ctinfo, data,
1670 &ras->locationRequest);
1671 case eRasMessage_locationConfirm:
1672 return process_lcf(skb, ct, ctinfo, data,
1673 &ras->locationConfirm);
1674 case eRasMessage_infoRequestResponse:
1675 return process_irr(skb, ct, ctinfo, data,
1676 &ras->infoRequestResponse);
1678 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1685 /****************************************************************************/
1686 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1687 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1689 static RasMessage ras;
1690 unsigned char *data;
1694 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1696 spin_lock_bh(&nf_h323_lock);
1699 data = get_udp_data(skb, protoff, &datalen);
1702 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1703 NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1705 /* Decode RAS message */
1706 ret = DecodeRasMessage(data, datalen, &ras);
1708 pr_debug("nf_ct_ras: decoding error: %s\n",
1709 ret == H323_ERROR_BOUND ?
1710 "out of bound" : "out of range");
1714 /* Process RAS message */
1715 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
1719 spin_unlock_bh(&nf_h323_lock);
1723 spin_unlock_bh(&nf_h323_lock);
1724 if (net_ratelimit())
1725 printk("nf_ct_ras: packet dropped\n");
1729 /****************************************************************************/
1730 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1736 .tuple.src.l3num = AF_INET,
1737 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1738 .tuple.dst.protonum = IPPROTO_UDP,
1746 .tuple.src.l3num = AF_INET6,
1747 .tuple.src.u.udp.port = __constant_htons(RAS_PORT),
1748 .tuple.dst.protonum = IPPROTO_UDP,
1753 /****************************************************************************/
1754 static void __exit nf_conntrack_h323_fini(void)
1756 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1757 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1758 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1759 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1761 pr_debug("nf_ct_h323: fini\n");
1764 /****************************************************************************/
1765 static int __init nf_conntrack_h323_init(void)
1769 h323_buffer = kmalloc(65536, GFP_KERNEL);
1772 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1775 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1778 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1781 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1784 pr_debug("nf_ct_h323: init success\n");
1788 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1790 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1792 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1797 /****************************************************************************/
1798 module_init(nf_conntrack_h323_init);
1799 module_exit(nf_conntrack_h323_fini);
1801 EXPORT_SYMBOL_GPL(get_h225_addr);
1802 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1803 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1804 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1805 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1806 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1807 EXPORT_SYMBOL_GPL(nat_t120_hook);
1808 EXPORT_SYMBOL_GPL(nat_h245_hook);
1809 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1810 EXPORT_SYMBOL_GPL(nat_q931_hook);
1812 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1813 MODULE_DESCRIPTION("H.323 connection tracking helper");
1814 MODULE_LICENSE("GPL");
1815 MODULE_ALIAS("ip_conntrack_h323");