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/slab.h>
21 #include <linux/udp.h>
22 #include <linux/tcp.h>
23 #include <linux/skbuff.h>
24 #include <net/route.h>
25 #include <net/ip6_route.h>
27 #include <net/netfilter/nf_conntrack.h>
28 #include <net/netfilter/nf_conntrack_core.h>
29 #include <net/netfilter/nf_conntrack_tuple.h>
30 #include <net/netfilter/nf_conntrack_expect.h>
31 #include <net/netfilter/nf_conntrack_ecache.h>
32 #include <net/netfilter/nf_conntrack_helper.h>
33 #include <net/netfilter/nf_conntrack_zones.h>
34 #include <linux/netfilter/nf_conntrack_h323.h>
37 static unsigned int default_rrq_ttl __read_mostly = 300;
38 module_param(default_rrq_ttl, uint, 0600);
39 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
41 static int gkrouted_only __read_mostly = 1;
42 module_param(gkrouted_only, int, 0600);
43 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
45 static int callforward_filter __read_mostly = 1;
46 module_param(callforward_filter, bool, 0600);
47 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
48 "if both endpoints are on different sides "
49 "(determined by routing information)");
52 int (*set_h245_addr_hook) (struct sk_buff *skb,
53 unsigned char **data, int dataoff,
54 H245_TransportAddress *taddr,
55 union nf_inet_addr *addr, __be16 port)
57 int (*set_h225_addr_hook) (struct sk_buff *skb,
58 unsigned char **data, int dataoff,
59 TransportAddress *taddr,
60 union nf_inet_addr *addr, __be16 port)
62 int (*set_sig_addr_hook) (struct sk_buff *skb,
64 enum ip_conntrack_info ctinfo,
66 TransportAddress *taddr, int count) __read_mostly;
67 int (*set_ras_addr_hook) (struct sk_buff *skb,
69 enum ip_conntrack_info ctinfo,
71 TransportAddress *taddr, int count) __read_mostly;
72 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
74 enum ip_conntrack_info ctinfo,
75 unsigned char **data, int dataoff,
76 H245_TransportAddress *taddr,
77 __be16 port, __be16 rtp_port,
78 struct nf_conntrack_expect *rtp_exp,
79 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
80 int (*nat_t120_hook) (struct sk_buff *skb,
82 enum ip_conntrack_info ctinfo,
83 unsigned char **data, int dataoff,
84 H245_TransportAddress *taddr, __be16 port,
85 struct nf_conntrack_expect *exp) __read_mostly;
86 int (*nat_h245_hook) (struct sk_buff *skb,
88 enum ip_conntrack_info ctinfo,
89 unsigned char **data, int dataoff,
90 TransportAddress *taddr, __be16 port,
91 struct nf_conntrack_expect *exp) __read_mostly;
92 int (*nat_callforwarding_hook) (struct sk_buff *skb,
94 enum ip_conntrack_info ctinfo,
95 unsigned char **data, int dataoff,
96 TransportAddress *taddr, __be16 port,
97 struct nf_conntrack_expect *exp) __read_mostly;
98 int (*nat_q931_hook) (struct sk_buff *skb,
100 enum ip_conntrack_info ctinfo,
101 unsigned char **data, TransportAddress *taddr, int idx,
102 __be16 port, struct nf_conntrack_expect *exp)
105 static DEFINE_SPINLOCK(nf_h323_lock);
106 static char *h323_buffer;
108 static struct nf_conntrack_helper nf_conntrack_helper_h245;
109 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
110 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
112 /****************************************************************************/
113 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
114 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
115 unsigned char **data, int *datalen, int *dataoff)
117 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
118 int dir = CTINFO2DIR(ctinfo);
119 const struct tcphdr *th;
128 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
132 /* Get TCP data offset */
133 tcpdataoff = protoff + th->doff * 4;
135 /* Get TCP data length */
136 tcpdatalen = skb->len - tcpdataoff;
137 if (tcpdatalen <= 0) /* No TCP data */
140 if (*data == NULL) { /* first TPKT */
141 /* Get first TPKT pointer */
142 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
144 BUG_ON(tpkt == NULL);
146 /* Validate TPKT identifier */
147 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
148 /* Netmeeting sends TPKT header and data separately */
149 if (info->tpkt_len[dir] > 0) {
150 pr_debug("nf_ct_h323: previous packet "
151 "indicated separate TPKT data of %hu "
152 "bytes\n", info->tpkt_len[dir]);
153 if (info->tpkt_len[dir] <= tcpdatalen) {
154 /* Yes, there was a TPKT header
157 *datalen = info->tpkt_len[dir];
162 /* Fragmented TPKT */
163 pr_debug("nf_ct_h323: fragmented TPKT\n");
167 /* It is not even a TPKT */
171 } else { /* Next TPKT */
172 tpktoff = *dataoff + *datalen;
173 tcpdatalen -= tpktoff;
174 if (tcpdatalen <= 4) /* No more TPKT */
176 tpkt = *data + *datalen;
178 /* Validate TPKT identifier */
179 if (tpkt[0] != 0x03 || tpkt[1] != 0)
183 /* Validate TPKT length */
184 tpktlen = tpkt[2] * 256 + tpkt[3];
187 if (tpktlen > tcpdatalen) {
188 if (tcpdatalen == 4) { /* Separate TPKT header */
189 /* Netmeeting sends TPKT header and data separately */
190 pr_debug("nf_ct_h323: separate TPKT header indicates "
191 "there will be TPKT data of %hu bytes\n",
193 info->tpkt_len[dir] = tpktlen - 4;
197 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
201 /* This is the encapsulated data */
203 *datalen = tpktlen - 4;
204 *dataoff = tpktoff + 4;
207 /* Clear TPKT length */
208 info->tpkt_len[dir] = 0;
212 info->tpkt_len[dir] = 0;
216 /****************************************************************************/
217 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
218 H245_TransportAddress *taddr,
219 union nf_inet_addr *addr, __be16 *port)
221 const unsigned char *p;
224 if (taddr->choice != eH245_TransportAddress_unicastAddress)
227 switch (taddr->unicastAddress.choice) {
228 case eUnicastAddress_iPAddress:
229 if (nf_ct_l3num(ct) != AF_INET)
231 p = data + taddr->unicastAddress.iPAddress.network;
234 case eUnicastAddress_iP6Address:
235 if (nf_ct_l3num(ct) != AF_INET6)
237 p = data + taddr->unicastAddress.iP6Address.network;
244 memcpy(addr, p, len);
245 memset((void *)addr + len, 0, sizeof(*addr) - len);
246 memcpy(port, p + len, sizeof(__be16));
251 /****************************************************************************/
252 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
253 enum ip_conntrack_info ctinfo,
254 unsigned char **data, int dataoff,
255 H245_TransportAddress *taddr)
257 int dir = CTINFO2DIR(ctinfo);
260 __be16 rtp_port, rtcp_port;
261 union nf_inet_addr addr;
262 struct nf_conntrack_expect *rtp_exp;
263 struct nf_conntrack_expect *rtcp_exp;
264 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
266 /* Read RTP or RTCP address */
267 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
268 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
272 /* RTP port is even */
275 rtcp_port = htons(ntohs(port) + 1);
277 /* Create expect for RTP */
278 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
280 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
281 &ct->tuplehash[!dir].tuple.src.u3,
282 &ct->tuplehash[!dir].tuple.dst.u3,
283 IPPROTO_UDP, NULL, &rtp_port);
285 /* Create expect for RTCP */
286 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
287 nf_ct_expect_put(rtp_exp);
290 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
291 &ct->tuplehash[!dir].tuple.src.u3,
292 &ct->tuplehash[!dir].tuple.dst.u3,
293 IPPROTO_UDP, NULL, &rtcp_port);
295 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
296 &ct->tuplehash[!dir].tuple.dst.u3,
297 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
298 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
299 ct->status & IPS_NAT_MASK) {
301 ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
302 taddr, port, rtp_port, rtp_exp, rtcp_exp);
303 } else { /* Conntrack only */
304 if (nf_ct_expect_related(rtp_exp) == 0) {
305 if (nf_ct_expect_related(rtcp_exp) == 0) {
306 pr_debug("nf_ct_h323: expect RTP ");
307 nf_ct_dump_tuple(&rtp_exp->tuple);
308 pr_debug("nf_ct_h323: expect RTCP ");
309 nf_ct_dump_tuple(&rtcp_exp->tuple);
311 nf_ct_unexpect_related(rtp_exp);
318 nf_ct_expect_put(rtp_exp);
319 nf_ct_expect_put(rtcp_exp);
324 /****************************************************************************/
325 static int expect_t120(struct sk_buff *skb,
327 enum ip_conntrack_info ctinfo,
328 unsigned char **data, int dataoff,
329 H245_TransportAddress *taddr)
331 int dir = CTINFO2DIR(ctinfo);
334 union nf_inet_addr addr;
335 struct nf_conntrack_expect *exp;
336 typeof(nat_t120_hook) nat_t120;
338 /* Read T.120 address */
339 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
340 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
344 /* Create expect for T.120 connections */
345 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
347 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
348 &ct->tuplehash[!dir].tuple.src.u3,
349 &ct->tuplehash[!dir].tuple.dst.u3,
350 IPPROTO_TCP, NULL, &port);
351 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
353 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
354 &ct->tuplehash[!dir].tuple.dst.u3,
355 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
356 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
357 ct->status & IPS_NAT_MASK) {
359 ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
361 } else { /* Conntrack only */
362 if (nf_ct_expect_related(exp) == 0) {
363 pr_debug("nf_ct_h323: expect T.120 ");
364 nf_ct_dump_tuple(&exp->tuple);
369 nf_ct_expect_put(exp);
374 /****************************************************************************/
375 static int process_h245_channel(struct sk_buff *skb,
377 enum ip_conntrack_info ctinfo,
378 unsigned char **data, int dataoff,
379 H2250LogicalChannelParameters *channel)
383 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
385 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
386 &channel->mediaChannel);
392 options & eH2250LogicalChannelParameters_mediaControlChannel) {
394 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
395 &channel->mediaControlChannel);
403 /****************************************************************************/
404 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
405 enum ip_conntrack_info ctinfo,
406 unsigned char **data, int dataoff,
407 OpenLogicalChannel *olc)
411 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
413 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
414 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
416 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
418 forwardLogicalChannelParameters.
420 h2250LogicalChannelParameters);
426 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
427 (olc->reverseLogicalChannelParameters.options &
428 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
429 && (olc->reverseLogicalChannelParameters.multiplexParameters.
431 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
434 process_h245_channel(skb, ct, ctinfo, data, dataoff,
436 reverseLogicalChannelParameters.
438 h2250LogicalChannelParameters);
443 if ((olc->options & eOpenLogicalChannel_separateStack) &&
444 olc->forwardLogicalChannelParameters.dataType.choice ==
446 olc->forwardLogicalChannelParameters.dataType.data.application.
447 choice == eDataApplicationCapability_application_t120 &&
448 olc->forwardLogicalChannelParameters.dataType.data.application.
449 t120.choice == eDataProtocolCapability_separateLANStack &&
450 olc->separateStack.networkAddress.choice ==
451 eNetworkAccessParameters_networkAddress_localAreaAddress) {
452 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
453 &olc->separateStack.networkAddress.
462 /****************************************************************************/
463 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
464 enum ip_conntrack_info ctinfo,
465 unsigned char **data, int dataoff,
466 OpenLogicalChannelAck *olca)
468 H2250LogicalChannelAckParameters *ack;
471 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
474 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
475 (olca->reverseLogicalChannelParameters.options &
476 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
477 && (olca->reverseLogicalChannelParameters.multiplexParameters.
479 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
481 ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
483 reverseLogicalChannelParameters.
485 h2250LogicalChannelParameters);
491 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
492 (olca->forwardMultiplexAckParameters.choice ==
493 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
495 ack = &olca->forwardMultiplexAckParameters.
496 h2250LogicalChannelAckParameters;
498 eH2250LogicalChannelAckParameters_mediaChannel) {
500 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
507 eH2250LogicalChannelAckParameters_mediaControlChannel) {
509 ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
510 &ack->mediaControlChannel);
516 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
517 olca->separateStack.networkAddress.choice ==
518 eNetworkAccessParameters_networkAddress_localAreaAddress) {
519 ret = expect_t120(skb, ct, ctinfo, data, dataoff,
520 &olca->separateStack.networkAddress.
529 /****************************************************************************/
530 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
531 enum ip_conntrack_info ctinfo,
532 unsigned char **data, int dataoff,
533 MultimediaSystemControlMessage *mscm)
535 switch (mscm->choice) {
536 case eMultimediaSystemControlMessage_request:
537 if (mscm->request.choice ==
538 eRequestMessage_openLogicalChannel) {
539 return process_olc(skb, ct, ctinfo, data, dataoff,
540 &mscm->request.openLogicalChannel);
542 pr_debug("nf_ct_h323: H.245 Request %d\n",
543 mscm->request.choice);
545 case eMultimediaSystemControlMessage_response:
546 if (mscm->response.choice ==
547 eResponseMessage_openLogicalChannelAck) {
548 return process_olca(skb, ct, ctinfo, data, dataoff,
550 openLogicalChannelAck);
552 pr_debug("nf_ct_h323: H.245 Response %d\n",
553 mscm->response.choice);
556 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
563 /****************************************************************************/
564 static int h245_help(struct sk_buff *skb, unsigned int protoff,
565 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
567 static MultimediaSystemControlMessage mscm;
568 unsigned char *data = NULL;
573 /* Until there's been traffic both ways, don't look in packets. */
574 if (ctinfo != IP_CT_ESTABLISHED &&
575 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
578 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
580 spin_lock_bh(&nf_h323_lock);
582 /* Process each TPKT */
583 while (get_tpkt_data(skb, protoff, ct, ctinfo,
584 &data, &datalen, &dataoff)) {
585 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
586 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
588 /* Decode H.245 signal */
589 ret = DecodeMultimediaSystemControlMessage(data, datalen,
592 pr_debug("nf_ct_h245: decoding error: %s\n",
593 ret == H323_ERROR_BOUND ?
594 "out of bound" : "out of range");
595 /* We don't drop when decoding error */
599 /* Process H.245 signal */
600 if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
604 spin_unlock_bh(&nf_h323_lock);
608 spin_unlock_bh(&nf_h323_lock);
610 pr_info("nf_ct_h245: packet dropped\n");
614 /****************************************************************************/
615 static const struct nf_conntrack_expect_policy h245_exp_policy = {
616 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
620 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
623 .tuple.src.l3num = AF_UNSPEC,
624 .tuple.dst.protonum = IPPROTO_UDP,
626 .expect_policy = &h245_exp_policy,
629 /****************************************************************************/
630 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
631 TransportAddress *taddr,
632 union nf_inet_addr *addr, __be16 *port)
634 const unsigned char *p;
637 switch (taddr->choice) {
638 case eTransportAddress_ipAddress:
639 if (nf_ct_l3num(ct) != AF_INET)
641 p = data + taddr->ipAddress.ip;
644 case eTransportAddress_ip6Address:
645 if (nf_ct_l3num(ct) != AF_INET6)
647 p = data + taddr->ip6Address.ip;
654 memcpy(addr, p, len);
655 memset((void *)addr + len, 0, sizeof(*addr) - len);
656 memcpy(port, p + len, sizeof(__be16));
661 /****************************************************************************/
662 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
663 enum ip_conntrack_info ctinfo,
664 unsigned char **data, int dataoff,
665 TransportAddress *taddr)
667 int dir = CTINFO2DIR(ctinfo);
670 union nf_inet_addr addr;
671 struct nf_conntrack_expect *exp;
672 typeof(nat_h245_hook) nat_h245;
674 /* Read h245Address */
675 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
676 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
680 /* Create expect for h245 connection */
681 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
683 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
684 &ct->tuplehash[!dir].tuple.src.u3,
685 &ct->tuplehash[!dir].tuple.dst.u3,
686 IPPROTO_TCP, NULL, &port);
687 exp->helper = &nf_conntrack_helper_h245;
689 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
690 &ct->tuplehash[!dir].tuple.dst.u3,
691 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
692 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
693 ct->status & IPS_NAT_MASK) {
695 ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
697 } else { /* Conntrack only */
698 if (nf_ct_expect_related(exp) == 0) {
699 pr_debug("nf_ct_q931: expect H.245 ");
700 nf_ct_dump_tuple(&exp->tuple);
705 nf_ct_expect_put(exp);
710 /* If the calling party is on the same side of the forward-to party,
711 * we don't need to track the second call */
712 static int callforward_do_filter(const union nf_inet_addr *src,
713 const union nf_inet_addr *dst,
716 const struct nf_afinfo *afinfo;
719 /* rcu_read_lock()ed by nf_hook_slow() */
720 afinfo = nf_get_afinfo(family);
726 struct flowi4 fl1, fl2;
727 struct rtable *rt1, *rt2;
729 memset(&fl1, 0, sizeof(fl1));
732 memset(&fl2, 0, sizeof(fl2));
734 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
735 flowi4_to_flowi(&fl1), false)) {
736 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
737 flowi4_to_flowi(&fl2), false)) {
738 if (rt1->rt_gateway == rt2->rt_gateway &&
739 rt1->dst.dev == rt2->dst.dev)
741 dst_release(&rt2->dst);
743 dst_release(&rt1->dst);
747 #if defined(CONFIG_NF_CONNTRACK_IPV6) || \
748 defined(CONFIG_NF_CONNTRACK_IPV6_MODULE)
750 struct flowi6 fl1, fl2;
751 struct rt6_info *rt1, *rt2;
753 memset(&fl1, 0, sizeof(fl1));
754 ipv6_addr_copy(&fl1.daddr, &src->in6);
756 memset(&fl2, 0, sizeof(fl2));
757 ipv6_addr_copy(&fl2.daddr, &dst->in6);
758 if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
759 flowi6_to_flowi(&fl1), false)) {
760 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
761 flowi6_to_flowi(&fl2), false)) {
762 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
763 sizeof(rt1->rt6i_gateway)) &&
764 rt1->dst.dev == rt2->dst.dev)
766 dst_release(&rt2->dst);
768 dst_release(&rt1->dst);
778 /****************************************************************************/
779 static int expect_callforwarding(struct sk_buff *skb,
781 enum ip_conntrack_info ctinfo,
782 unsigned char **data, int dataoff,
783 TransportAddress *taddr)
785 int dir = CTINFO2DIR(ctinfo);
788 union nf_inet_addr addr;
789 struct nf_conntrack_expect *exp;
790 typeof(nat_callforwarding_hook) nat_callforwarding;
792 /* Read alternativeAddress */
793 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
796 /* If the calling party is on the same side of the forward-to party,
797 * we don't need to track the second call */
798 if (callforward_filter &&
799 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
801 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
805 /* Create expect for the second call leg */
806 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
808 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
809 &ct->tuplehash[!dir].tuple.src.u3, &addr,
810 IPPROTO_TCP, NULL, &port);
811 exp->helper = nf_conntrack_helper_q931;
813 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
814 &ct->tuplehash[!dir].tuple.dst.u3,
815 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
816 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
817 ct->status & IPS_NAT_MASK) {
819 ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
821 } else { /* Conntrack only */
822 if (nf_ct_expect_related(exp) == 0) {
823 pr_debug("nf_ct_q931: expect Call Forwarding ");
824 nf_ct_dump_tuple(&exp->tuple);
829 nf_ct_expect_put(exp);
834 /****************************************************************************/
835 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
836 enum ip_conntrack_info ctinfo,
837 unsigned char **data, int dataoff,
840 int dir = CTINFO2DIR(ctinfo);
844 union nf_inet_addr addr;
845 typeof(set_h225_addr_hook) set_h225_addr;
847 pr_debug("nf_ct_q931: Setup\n");
849 if (setup->options & eSetup_UUIE_h245Address) {
850 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
851 &setup->h245Address);
856 set_h225_addr = rcu_dereference(set_h225_addr_hook);
857 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
858 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
859 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
861 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
862 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
863 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
864 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
865 ret = set_h225_addr(skb, data, dataoff,
866 &setup->destCallSignalAddress,
867 &ct->tuplehash[!dir].tuple.src.u3,
868 ct->tuplehash[!dir].tuple.src.u.tcp.port);
873 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
874 (set_h225_addr) && ct->status & IPS_NAT_MASK &&
875 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
877 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
878 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
879 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
880 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
881 ret = set_h225_addr(skb, data, dataoff,
882 &setup->sourceCallSignalAddress,
883 &ct->tuplehash[!dir].tuple.dst.u3,
884 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
889 if (setup->options & eSetup_UUIE_fastStart) {
890 for (i = 0; i < setup->fastStart.count; i++) {
891 ret = process_olc(skb, ct, ctinfo, data, dataoff,
892 &setup->fastStart.item[i]);
901 /****************************************************************************/
902 static int process_callproceeding(struct sk_buff *skb,
904 enum ip_conntrack_info ctinfo,
905 unsigned char **data, int dataoff,
906 CallProceeding_UUIE *callproc)
911 pr_debug("nf_ct_q931: CallProceeding\n");
913 if (callproc->options & eCallProceeding_UUIE_h245Address) {
914 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
915 &callproc->h245Address);
920 if (callproc->options & eCallProceeding_UUIE_fastStart) {
921 for (i = 0; i < callproc->fastStart.count; i++) {
922 ret = process_olc(skb, ct, ctinfo, data, dataoff,
923 &callproc->fastStart.item[i]);
932 /****************************************************************************/
933 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
934 enum ip_conntrack_info ctinfo,
935 unsigned char **data, int dataoff,
936 Connect_UUIE *connect)
941 pr_debug("nf_ct_q931: Connect\n");
943 if (connect->options & eConnect_UUIE_h245Address) {
944 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
945 &connect->h245Address);
950 if (connect->options & eConnect_UUIE_fastStart) {
951 for (i = 0; i < connect->fastStart.count; i++) {
952 ret = process_olc(skb, ct, ctinfo, data, dataoff,
953 &connect->fastStart.item[i]);
962 /****************************************************************************/
963 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
964 enum ip_conntrack_info ctinfo,
965 unsigned char **data, int dataoff,
966 Alerting_UUIE *alert)
971 pr_debug("nf_ct_q931: Alerting\n");
973 if (alert->options & eAlerting_UUIE_h245Address) {
974 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
975 &alert->h245Address);
980 if (alert->options & eAlerting_UUIE_fastStart) {
981 for (i = 0; i < alert->fastStart.count; i++) {
982 ret = process_olc(skb, ct, ctinfo, data, dataoff,
983 &alert->fastStart.item[i]);
992 /****************************************************************************/
993 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
994 enum ip_conntrack_info ctinfo,
995 unsigned char **data, int dataoff,
996 Facility_UUIE *facility)
1001 pr_debug("nf_ct_q931: Facility\n");
1003 if (facility->reason.choice == eFacilityReason_callForwarded) {
1004 if (facility->options & eFacility_UUIE_alternativeAddress)
1005 return expect_callforwarding(skb, ct, ctinfo, data,
1008 alternativeAddress);
1012 if (facility->options & eFacility_UUIE_h245Address) {
1013 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1014 &facility->h245Address);
1019 if (facility->options & eFacility_UUIE_fastStart) {
1020 for (i = 0; i < facility->fastStart.count; i++) {
1021 ret = process_olc(skb, ct, ctinfo, data, dataoff,
1022 &facility->fastStart.item[i]);
1031 /****************************************************************************/
1032 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1033 enum ip_conntrack_info ctinfo,
1034 unsigned char **data, int dataoff,
1035 Progress_UUIE *progress)
1040 pr_debug("nf_ct_q931: Progress\n");
1042 if (progress->options & eProgress_UUIE_h245Address) {
1043 ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1044 &progress->h245Address);
1049 if (progress->options & eProgress_UUIE_fastStart) {
1050 for (i = 0; i < progress->fastStart.count; i++) {
1051 ret = process_olc(skb, ct, ctinfo, data, dataoff,
1052 &progress->fastStart.item[i]);
1061 /****************************************************************************/
1062 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1063 enum ip_conntrack_info ctinfo,
1064 unsigned char **data, int dataoff, Q931 *q931)
1066 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1070 switch (pdu->h323_message_body.choice) {
1071 case eH323_UU_PDU_h323_message_body_setup:
1072 ret = process_setup(skb, ct, ctinfo, data, dataoff,
1073 &pdu->h323_message_body.setup);
1075 case eH323_UU_PDU_h323_message_body_callProceeding:
1076 ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
1077 &pdu->h323_message_body.
1080 case eH323_UU_PDU_h323_message_body_connect:
1081 ret = process_connect(skb, ct, ctinfo, data, dataoff,
1082 &pdu->h323_message_body.connect);
1084 case eH323_UU_PDU_h323_message_body_alerting:
1085 ret = process_alerting(skb, ct, ctinfo, data, dataoff,
1086 &pdu->h323_message_body.alerting);
1088 case eH323_UU_PDU_h323_message_body_facility:
1089 ret = process_facility(skb, ct, ctinfo, data, dataoff,
1090 &pdu->h323_message_body.facility);
1092 case eH323_UU_PDU_h323_message_body_progress:
1093 ret = process_progress(skb, ct, ctinfo, data, dataoff,
1094 &pdu->h323_message_body.progress);
1097 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1098 pdu->h323_message_body.choice);
1105 if (pdu->options & eH323_UU_PDU_h245Control) {
1106 for (i = 0; i < pdu->h245Control.count; i++) {
1107 ret = process_h245(skb, ct, ctinfo, data, dataoff,
1108 &pdu->h245Control.item[i]);
1117 /****************************************************************************/
1118 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1119 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1122 unsigned char *data = NULL;
1127 /* Until there's been traffic both ways, don't look in packets. */
1128 if (ctinfo != IP_CT_ESTABLISHED &&
1129 ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
1132 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1134 spin_lock_bh(&nf_h323_lock);
1136 /* Process each TPKT */
1137 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1138 &data, &datalen, &dataoff)) {
1139 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1140 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1142 /* Decode Q.931 signal */
1143 ret = DecodeQ931(data, datalen, &q931);
1145 pr_debug("nf_ct_q931: decoding error: %s\n",
1146 ret == H323_ERROR_BOUND ?
1147 "out of bound" : "out of range");
1148 /* We don't drop when decoding error */
1152 /* Process Q.931 signal */
1153 if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
1157 spin_unlock_bh(&nf_h323_lock);
1161 spin_unlock_bh(&nf_h323_lock);
1162 if (net_ratelimit())
1163 pr_info("nf_ct_q931: packet dropped\n");
1167 /****************************************************************************/
1168 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1169 /* T.120 and H.245 */
1170 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1174 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1178 .tuple.src.l3num = AF_INET,
1179 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1180 .tuple.dst.protonum = IPPROTO_TCP,
1182 .expect_policy = &q931_exp_policy,
1187 .tuple.src.l3num = AF_INET6,
1188 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1189 .tuple.dst.protonum = IPPROTO_TCP,
1191 .expect_policy = &q931_exp_policy,
1195 /****************************************************************************/
1196 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1199 const struct udphdr *uh;
1203 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1206 dataoff = protoff + sizeof(_uh);
1207 if (dataoff >= skb->len)
1209 *datalen = skb->len - dataoff;
1210 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1213 /****************************************************************************/
1214 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1215 union nf_inet_addr *addr,
1218 struct net *net = nf_ct_net(ct);
1219 struct nf_conntrack_expect *exp;
1220 struct nf_conntrack_tuple tuple;
1222 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1223 tuple.src.u.tcp.port = 0;
1224 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1225 tuple.dst.u.tcp.port = port;
1226 tuple.dst.protonum = IPPROTO_TCP;
1228 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1229 if (exp && exp->master == ct)
1234 /****************************************************************************/
1235 static int set_expect_timeout(struct nf_conntrack_expect *exp,
1238 if (!exp || !del_timer(&exp->timeout))
1241 exp->timeout.expires = jiffies + timeout * HZ;
1242 add_timer(&exp->timeout);
1247 /****************************************************************************/
1248 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1249 enum ip_conntrack_info ctinfo,
1250 unsigned char **data,
1251 TransportAddress *taddr, int count)
1253 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1254 int dir = CTINFO2DIR(ctinfo);
1258 union nf_inet_addr addr;
1259 struct nf_conntrack_expect *exp;
1260 typeof(nat_q931_hook) nat_q931;
1262 /* Look for the first related address */
1263 for (i = 0; i < count; i++) {
1264 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1265 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1266 sizeof(addr)) == 0 && port != 0)
1270 if (i >= count) /* Not found */
1273 /* Create expect for Q.931 */
1274 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1276 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1277 gkrouted_only ? /* only accept calls from GK? */
1278 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1279 &ct->tuplehash[!dir].tuple.dst.u3,
1280 IPPROTO_TCP, NULL, &port);
1281 exp->helper = nf_conntrack_helper_q931;
1282 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1284 nat_q931 = rcu_dereference(nat_q931_hook);
1285 if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */
1286 ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
1287 } else { /* Conntrack only */
1288 if (nf_ct_expect_related(exp) == 0) {
1289 pr_debug("nf_ct_ras: expect Q.931 ");
1290 nf_ct_dump_tuple(&exp->tuple);
1292 /* Save port for looking up expect in processing RCF */
1293 info->sig_port[dir] = port;
1298 nf_ct_expect_put(exp);
1303 /****************************************************************************/
1304 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1305 enum ip_conntrack_info ctinfo,
1306 unsigned char **data, GatekeeperRequest *grq)
1308 typeof(set_ras_addr_hook) set_ras_addr;
1310 pr_debug("nf_ct_ras: GRQ\n");
1312 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1313 if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */
1314 return set_ras_addr(skb, ct, ctinfo, data,
1315 &grq->rasAddress, 1);
1319 /****************************************************************************/
1320 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1321 enum ip_conntrack_info ctinfo,
1322 unsigned char **data, GatekeeperConfirm *gcf)
1324 int dir = CTINFO2DIR(ctinfo);
1327 union nf_inet_addr addr;
1328 struct nf_conntrack_expect *exp;
1330 pr_debug("nf_ct_ras: GCF\n");
1332 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1335 /* Registration port is the same as discovery port */
1336 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1337 port == ct->tuplehash[dir].tuple.src.u.udp.port)
1340 /* Avoid RAS expectation loops. A GCF is never expected. */
1341 if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1344 /* Need new expect */
1345 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1347 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1348 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1349 IPPROTO_UDP, NULL, &port);
1350 exp->helper = nf_conntrack_helper_ras;
1352 if (nf_ct_expect_related(exp) == 0) {
1353 pr_debug("nf_ct_ras: expect RAS ");
1354 nf_ct_dump_tuple(&exp->tuple);
1358 nf_ct_expect_put(exp);
1363 /****************************************************************************/
1364 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1365 enum ip_conntrack_info ctinfo,
1366 unsigned char **data, RegistrationRequest *rrq)
1368 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1370 typeof(set_ras_addr_hook) set_ras_addr;
1372 pr_debug("nf_ct_ras: RRQ\n");
1374 ret = expect_q931(skb, ct, ctinfo, data,
1375 rrq->callSignalAddress.item,
1376 rrq->callSignalAddress.count);
1380 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1381 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1382 ret = set_ras_addr(skb, ct, ctinfo, data,
1383 rrq->rasAddress.item,
1384 rrq->rasAddress.count);
1389 if (rrq->options & eRegistrationRequest_timeToLive) {
1390 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1391 info->timeout = rrq->timeToLive;
1393 info->timeout = default_rrq_ttl;
1398 /****************************************************************************/
1399 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1400 enum ip_conntrack_info ctinfo,
1401 unsigned char **data, RegistrationConfirm *rcf)
1403 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1404 int dir = CTINFO2DIR(ctinfo);
1406 struct nf_conntrack_expect *exp;
1407 typeof(set_sig_addr_hook) set_sig_addr;
1409 pr_debug("nf_ct_ras: RCF\n");
1411 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1412 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1413 ret = set_sig_addr(skb, ct, ctinfo, data,
1414 rcf->callSignalAddress.item,
1415 rcf->callSignalAddress.count);
1420 if (rcf->options & eRegistrationConfirm_timeToLive) {
1421 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1422 info->timeout = rcf->timeToLive;
1425 if (info->timeout > 0) {
1426 pr_debug("nf_ct_ras: set RAS connection timeout to "
1427 "%u seconds\n", info->timeout);
1428 nf_ct_refresh(ct, skb, info->timeout * HZ);
1430 /* Set expect timeout */
1431 spin_lock_bh(&nf_conntrack_lock);
1432 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1433 info->sig_port[!dir]);
1435 pr_debug("nf_ct_ras: set Q.931 expect "
1436 "timeout to %u seconds for",
1438 nf_ct_dump_tuple(&exp->tuple);
1439 set_expect_timeout(exp, info->timeout);
1441 spin_unlock_bh(&nf_conntrack_lock);
1447 /****************************************************************************/
1448 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1449 enum ip_conntrack_info ctinfo,
1450 unsigned char **data, UnregistrationRequest *urq)
1452 struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1453 int dir = CTINFO2DIR(ctinfo);
1455 typeof(set_sig_addr_hook) set_sig_addr;
1457 pr_debug("nf_ct_ras: URQ\n");
1459 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1460 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1461 ret = set_sig_addr(skb, ct, ctinfo, data,
1462 urq->callSignalAddress.item,
1463 urq->callSignalAddress.count);
1468 /* Clear old expect */
1469 nf_ct_remove_expectations(ct);
1470 info->sig_port[dir] = 0;
1471 info->sig_port[!dir] = 0;
1473 /* Give it 30 seconds for UCF or URJ */
1474 nf_ct_refresh(ct, skb, 30 * HZ);
1479 /****************************************************************************/
1480 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1481 enum ip_conntrack_info ctinfo,
1482 unsigned char **data, AdmissionRequest *arq)
1484 const struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
1485 int dir = CTINFO2DIR(ctinfo);
1487 union nf_inet_addr addr;
1488 typeof(set_h225_addr_hook) set_h225_addr;
1490 pr_debug("nf_ct_ras: ARQ\n");
1492 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1493 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1494 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1496 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1497 port == info->sig_port[dir] &&
1498 set_h225_addr && ct->status & IPS_NAT_MASK) {
1500 return set_h225_addr(skb, data, 0,
1501 &arq->destCallSignalAddress,
1502 &ct->tuplehash[!dir].tuple.dst.u3,
1503 info->sig_port[!dir]);
1506 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1507 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1509 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1510 set_h225_addr && ct->status & IPS_NAT_MASK) {
1512 return set_h225_addr(skb, data, 0,
1513 &arq->srcCallSignalAddress,
1514 &ct->tuplehash[!dir].tuple.dst.u3,
1521 /****************************************************************************/
1522 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1523 enum ip_conntrack_info ctinfo,
1524 unsigned char **data, AdmissionConfirm *acf)
1526 int dir = CTINFO2DIR(ctinfo);
1529 union nf_inet_addr addr;
1530 struct nf_conntrack_expect *exp;
1531 typeof(set_sig_addr_hook) set_sig_addr;
1533 pr_debug("nf_ct_ras: ACF\n");
1535 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1539 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1541 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1542 if (set_sig_addr && ct->status & IPS_NAT_MASK)
1543 return set_sig_addr(skb, ct, ctinfo, data,
1544 &acf->destCallSignalAddress, 1);
1548 /* Need new expect */
1549 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1551 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1552 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1553 IPPROTO_TCP, NULL, &port);
1554 exp->flags = NF_CT_EXPECT_PERMANENT;
1555 exp->helper = nf_conntrack_helper_q931;
1557 if (nf_ct_expect_related(exp) == 0) {
1558 pr_debug("nf_ct_ras: expect Q.931 ");
1559 nf_ct_dump_tuple(&exp->tuple);
1563 nf_ct_expect_put(exp);
1568 /****************************************************************************/
1569 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1570 enum ip_conntrack_info ctinfo,
1571 unsigned char **data, LocationRequest *lrq)
1573 typeof(set_ras_addr_hook) set_ras_addr;
1575 pr_debug("nf_ct_ras: LRQ\n");
1577 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1578 if (set_ras_addr && ct->status & IPS_NAT_MASK)
1579 return set_ras_addr(skb, ct, ctinfo, data,
1580 &lrq->replyAddress, 1);
1584 /****************************************************************************/
1585 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1586 enum ip_conntrack_info ctinfo,
1587 unsigned char **data, LocationConfirm *lcf)
1589 int dir = CTINFO2DIR(ctinfo);
1592 union nf_inet_addr addr;
1593 struct nf_conntrack_expect *exp;
1595 pr_debug("nf_ct_ras: LCF\n");
1597 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1601 /* Need new expect for call signal */
1602 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1604 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1605 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1606 IPPROTO_TCP, NULL, &port);
1607 exp->flags = NF_CT_EXPECT_PERMANENT;
1608 exp->helper = nf_conntrack_helper_q931;
1610 if (nf_ct_expect_related(exp) == 0) {
1611 pr_debug("nf_ct_ras: expect Q.931 ");
1612 nf_ct_dump_tuple(&exp->tuple);
1616 nf_ct_expect_put(exp);
1618 /* Ignore rasAddress */
1623 /****************************************************************************/
1624 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1625 enum ip_conntrack_info ctinfo,
1626 unsigned char **data, InfoRequestResponse *irr)
1629 typeof(set_ras_addr_hook) set_ras_addr;
1630 typeof(set_sig_addr_hook) set_sig_addr;
1632 pr_debug("nf_ct_ras: IRR\n");
1634 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1635 if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1636 ret = set_ras_addr(skb, ct, ctinfo, data,
1637 &irr->rasAddress, 1);
1642 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1643 if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1644 ret = set_sig_addr(skb, ct, ctinfo, data,
1645 irr->callSignalAddress.item,
1646 irr->callSignalAddress.count);
1654 /****************************************************************************/
1655 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1656 enum ip_conntrack_info ctinfo,
1657 unsigned char **data, RasMessage *ras)
1659 switch (ras->choice) {
1660 case eRasMessage_gatekeeperRequest:
1661 return process_grq(skb, ct, ctinfo, data,
1662 &ras->gatekeeperRequest);
1663 case eRasMessage_gatekeeperConfirm:
1664 return process_gcf(skb, ct, ctinfo, data,
1665 &ras->gatekeeperConfirm);
1666 case eRasMessage_registrationRequest:
1667 return process_rrq(skb, ct, ctinfo, data,
1668 &ras->registrationRequest);
1669 case eRasMessage_registrationConfirm:
1670 return process_rcf(skb, ct, ctinfo, data,
1671 &ras->registrationConfirm);
1672 case eRasMessage_unregistrationRequest:
1673 return process_urq(skb, ct, ctinfo, data,
1674 &ras->unregistrationRequest);
1675 case eRasMessage_admissionRequest:
1676 return process_arq(skb, ct, ctinfo, data,
1677 &ras->admissionRequest);
1678 case eRasMessage_admissionConfirm:
1679 return process_acf(skb, ct, ctinfo, data,
1680 &ras->admissionConfirm);
1681 case eRasMessage_locationRequest:
1682 return process_lrq(skb, ct, ctinfo, data,
1683 &ras->locationRequest);
1684 case eRasMessage_locationConfirm:
1685 return process_lcf(skb, ct, ctinfo, data,
1686 &ras->locationConfirm);
1687 case eRasMessage_infoRequestResponse:
1688 return process_irr(skb, ct, ctinfo, data,
1689 &ras->infoRequestResponse);
1691 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1698 /****************************************************************************/
1699 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1700 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1702 static RasMessage ras;
1703 unsigned char *data;
1707 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1709 spin_lock_bh(&nf_h323_lock);
1712 data = get_udp_data(skb, protoff, &datalen);
1715 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1716 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1718 /* Decode RAS message */
1719 ret = DecodeRasMessage(data, datalen, &ras);
1721 pr_debug("nf_ct_ras: decoding error: %s\n",
1722 ret == H323_ERROR_BOUND ?
1723 "out of bound" : "out of range");
1727 /* Process RAS message */
1728 if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
1732 spin_unlock_bh(&nf_h323_lock);
1736 spin_unlock_bh(&nf_h323_lock);
1737 if (net_ratelimit())
1738 pr_info("nf_ct_ras: packet dropped\n");
1742 /****************************************************************************/
1743 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1748 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1752 .tuple.src.l3num = AF_INET,
1753 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1754 .tuple.dst.protonum = IPPROTO_UDP,
1756 .expect_policy = &ras_exp_policy,
1761 .tuple.src.l3num = AF_INET6,
1762 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1763 .tuple.dst.protonum = IPPROTO_UDP,
1765 .expect_policy = &ras_exp_policy,
1769 /****************************************************************************/
1770 static void __exit nf_conntrack_h323_fini(void)
1772 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1773 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1774 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1775 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1776 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1778 pr_debug("nf_ct_h323: fini\n");
1781 /****************************************************************************/
1782 static int __init nf_conntrack_h323_init(void)
1786 h323_buffer = kmalloc(65536, GFP_KERNEL);
1789 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1792 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1795 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1798 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1801 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1804 pr_debug("nf_ct_h323: init success\n");
1808 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1810 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1812 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1814 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1820 /****************************************************************************/
1821 module_init(nf_conntrack_h323_init);
1822 module_exit(nf_conntrack_h323_fini);
1824 EXPORT_SYMBOL_GPL(get_h225_addr);
1825 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1826 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1827 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1828 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1829 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1830 EXPORT_SYMBOL_GPL(nat_t120_hook);
1831 EXPORT_SYMBOL_GPL(nat_h245_hook);
1832 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1833 EXPORT_SYMBOL_GPL(nat_q931_hook);
1835 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1836 MODULE_DESCRIPTION("H.323 connection tracking helper");
1837 MODULE_LICENSE("GPL");
1838 MODULE_ALIAS("ip_conntrack_h323");
1839 MODULE_ALIAS_NFCT_HELPER("h323");