1 // SPDX-License-Identifier: GPL-2.0-only
3 * H.323 connection tracking helper
5 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
6 * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
8 * Based on the 'brute force' H.323 connection tracking module by
9 * Jozsef Kadlecsik <kadlec@netfilter.org>
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>
26 #include <linux/netfilter_ipv6.h>
28 #include <net/netfilter/nf_conntrack.h>
29 #include <net/netfilter/nf_conntrack_core.h>
30 #include <net/netfilter/nf_conntrack_tuple.h>
31 #include <net/netfilter/nf_conntrack_expect.h>
32 #include <net/netfilter/nf_conntrack_ecache.h>
33 #include <net/netfilter/nf_conntrack_helper.h>
34 #include <net/netfilter/nf_conntrack_zones.h>
35 #include <linux/netfilter/nf_conntrack_h323.h>
38 static unsigned int default_rrq_ttl __read_mostly = 300;
39 module_param(default_rrq_ttl, uint, 0600);
40 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
42 static int gkrouted_only __read_mostly = 1;
43 module_param(gkrouted_only, int, 0600);
44 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
46 static bool callforward_filter __read_mostly = true;
47 module_param(callforward_filter, bool, 0600);
48 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
49 "if both endpoints are on different sides "
50 "(determined by routing information)");
53 int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
54 unsigned char **data, int dataoff,
55 H245_TransportAddress *taddr,
56 union nf_inet_addr *addr, __be16 port)
58 int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
59 unsigned char **data, int dataoff,
60 TransportAddress *taddr,
61 union nf_inet_addr *addr, __be16 port)
63 int (*set_sig_addr_hook) (struct sk_buff *skb,
65 enum ip_conntrack_info ctinfo,
66 unsigned int protoff, unsigned char **data,
67 TransportAddress *taddr, int count) __read_mostly;
68 int (*set_ras_addr_hook) (struct sk_buff *skb,
70 enum ip_conntrack_info ctinfo,
71 unsigned int protoff, unsigned char **data,
72 TransportAddress *taddr, int count) __read_mostly;
73 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
75 enum ip_conntrack_info ctinfo,
77 unsigned char **data, int dataoff,
78 H245_TransportAddress *taddr,
79 __be16 port, __be16 rtp_port,
80 struct nf_conntrack_expect *rtp_exp,
81 struct nf_conntrack_expect *rtcp_exp) __read_mostly;
82 int (*nat_t120_hook) (struct sk_buff *skb,
84 enum ip_conntrack_info ctinfo,
86 unsigned char **data, int dataoff,
87 H245_TransportAddress *taddr, __be16 port,
88 struct nf_conntrack_expect *exp) __read_mostly;
89 int (*nat_h245_hook) (struct sk_buff *skb,
91 enum ip_conntrack_info ctinfo,
93 unsigned char **data, int dataoff,
94 TransportAddress *taddr, __be16 port,
95 struct nf_conntrack_expect *exp) __read_mostly;
96 int (*nat_callforwarding_hook) (struct sk_buff *skb,
98 enum ip_conntrack_info ctinfo,
100 unsigned char **data, int dataoff,
101 TransportAddress *taddr, __be16 port,
102 struct nf_conntrack_expect *exp) __read_mostly;
103 int (*nat_q931_hook) (struct sk_buff *skb,
105 enum ip_conntrack_info ctinfo,
106 unsigned int protoff,
107 unsigned char **data, TransportAddress *taddr, int idx,
108 __be16 port, struct nf_conntrack_expect *exp)
111 static DEFINE_SPINLOCK(nf_h323_lock);
112 static char *h323_buffer;
114 static struct nf_conntrack_helper nf_conntrack_helper_h245;
115 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
116 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
118 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
119 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
120 unsigned char **data, int *datalen, int *dataoff)
122 struct nf_ct_h323_master *info = nfct_help_data(ct);
123 int dir = CTINFO2DIR(ctinfo);
124 const struct tcphdr *th;
133 th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
137 /* Get TCP data offset */
138 tcpdataoff = protoff + th->doff * 4;
140 /* Get TCP data length */
141 tcpdatalen = skb->len - tcpdataoff;
142 if (tcpdatalen <= 0) /* No TCP data */
145 if (*data == NULL) { /* first TPKT */
146 /* Get first TPKT pointer */
147 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
149 BUG_ON(tpkt == NULL);
151 /* Validate TPKT identifier */
152 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
153 /* Netmeeting sends TPKT header and data separately */
154 if (info->tpkt_len[dir] > 0) {
155 pr_debug("nf_ct_h323: previous packet "
156 "indicated separate TPKT data of %hu "
157 "bytes\n", info->tpkt_len[dir]);
158 if (info->tpkt_len[dir] <= tcpdatalen) {
159 /* Yes, there was a TPKT header
162 *datalen = info->tpkt_len[dir];
167 /* Fragmented TPKT */
168 pr_debug("nf_ct_h323: fragmented TPKT\n");
172 /* It is not even a TPKT */
176 } else { /* Next TPKT */
177 tpktoff = *dataoff + *datalen;
178 tcpdatalen -= tpktoff;
179 if (tcpdatalen <= 4) /* No more TPKT */
181 tpkt = *data + *datalen;
183 /* Validate TPKT identifier */
184 if (tpkt[0] != 0x03 || tpkt[1] != 0)
188 /* Validate TPKT length */
189 tpktlen = tpkt[2] * 256 + tpkt[3];
192 if (tpktlen > tcpdatalen) {
193 if (tcpdatalen == 4) { /* Separate TPKT header */
194 /* Netmeeting sends TPKT header and data separately */
195 pr_debug("nf_ct_h323: separate TPKT header indicates "
196 "there will be TPKT data of %hu bytes\n",
198 info->tpkt_len[dir] = tpktlen - 4;
202 pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
206 /* This is the encapsulated data */
208 *datalen = tpktlen - 4;
209 *dataoff = tpktoff + 4;
212 /* Clear TPKT length */
213 info->tpkt_len[dir] = 0;
217 info->tpkt_len[dir] = 0;
221 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
222 H245_TransportAddress *taddr,
223 union nf_inet_addr *addr, __be16 *port)
225 const unsigned char *p;
228 if (taddr->choice != eH245_TransportAddress_unicastAddress)
231 switch (taddr->unicastAddress.choice) {
232 case eUnicastAddress_iPAddress:
233 if (nf_ct_l3num(ct) != AF_INET)
235 p = data + taddr->unicastAddress.iPAddress.network;
238 case eUnicastAddress_iP6Address:
239 if (nf_ct_l3num(ct) != AF_INET6)
241 p = data + taddr->unicastAddress.iP6Address.network;
248 memcpy(addr, p, len);
249 memset((void *)addr + len, 0, sizeof(*addr) - len);
250 memcpy(port, p + len, sizeof(__be16));
255 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
256 enum ip_conntrack_info ctinfo,
257 unsigned int protoff,
258 unsigned char **data, int dataoff,
259 H245_TransportAddress *taddr)
261 int dir = CTINFO2DIR(ctinfo);
264 __be16 rtp_port, rtcp_port;
265 union nf_inet_addr addr;
266 struct nf_conntrack_expect *rtp_exp;
267 struct nf_conntrack_expect *rtcp_exp;
268 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
270 /* Read RTP or RTCP address */
271 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
272 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
276 /* RTP port is even */
277 rtp_port = port & ~htons(1);
278 rtcp_port = port | htons(1);
280 /* Create expect for RTP */
281 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
283 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
284 &ct->tuplehash[!dir].tuple.src.u3,
285 &ct->tuplehash[!dir].tuple.dst.u3,
286 IPPROTO_UDP, NULL, &rtp_port);
288 /* Create expect for RTCP */
289 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
290 nf_ct_expect_put(rtp_exp);
293 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
294 &ct->tuplehash[!dir].tuple.src.u3,
295 &ct->tuplehash[!dir].tuple.dst.u3,
296 IPPROTO_UDP, NULL, &rtcp_port);
298 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
299 &ct->tuplehash[!dir].tuple.dst.u3,
300 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
301 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
302 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
303 ct->status & IPS_NAT_MASK) {
305 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
306 taddr, port, rtp_port, rtp_exp, rtcp_exp);
307 } else { /* Conntrack only */
308 if (nf_ct_expect_related(rtp_exp, 0) == 0) {
309 if (nf_ct_expect_related(rtcp_exp, 0) == 0) {
310 pr_debug("nf_ct_h323: expect RTP ");
311 nf_ct_dump_tuple(&rtp_exp->tuple);
312 pr_debug("nf_ct_h323: expect RTCP ");
313 nf_ct_dump_tuple(&rtcp_exp->tuple);
315 nf_ct_unexpect_related(rtp_exp);
322 nf_ct_expect_put(rtp_exp);
323 nf_ct_expect_put(rtcp_exp);
328 static int expect_t120(struct sk_buff *skb,
330 enum ip_conntrack_info ctinfo,
331 unsigned int protoff,
332 unsigned char **data, int dataoff,
333 H245_TransportAddress *taddr)
335 int dir = CTINFO2DIR(ctinfo);
338 union nf_inet_addr addr;
339 struct nf_conntrack_expect *exp;
340 typeof(nat_t120_hook) nat_t120;
342 /* Read T.120 address */
343 if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
344 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
348 /* Create expect for T.120 connections */
349 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
351 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
352 &ct->tuplehash[!dir].tuple.src.u3,
353 &ct->tuplehash[!dir].tuple.dst.u3,
354 IPPROTO_TCP, NULL, &port);
355 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */
357 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
358 &ct->tuplehash[!dir].tuple.dst.u3,
359 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
360 (nat_t120 = rcu_dereference(nat_t120_hook)) &&
361 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
362 ct->status & IPS_NAT_MASK) {
364 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
366 } else { /* Conntrack only */
367 if (nf_ct_expect_related(exp, 0) == 0) {
368 pr_debug("nf_ct_h323: expect T.120 ");
369 nf_ct_dump_tuple(&exp->tuple);
374 nf_ct_expect_put(exp);
379 static int process_h245_channel(struct sk_buff *skb,
381 enum ip_conntrack_info ctinfo,
382 unsigned int protoff,
383 unsigned char **data, int dataoff,
384 H2250LogicalChannelParameters *channel)
388 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
390 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
391 &channel->mediaChannel);
397 options & eH2250LogicalChannelParameters_mediaControlChannel) {
399 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
400 &channel->mediaControlChannel);
408 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
409 enum ip_conntrack_info ctinfo,
410 unsigned int protoff,
411 unsigned char **data, int dataoff,
412 OpenLogicalChannel *olc)
416 pr_debug("nf_ct_h323: OpenLogicalChannel\n");
418 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
419 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
421 ret = process_h245_channel(skb, ct, ctinfo,
422 protoff, data, dataoff,
424 forwardLogicalChannelParameters.
426 h2250LogicalChannelParameters);
432 eOpenLogicalChannel_reverseLogicalChannelParameters) &&
433 (olc->reverseLogicalChannelParameters.options &
434 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
435 && (olc->reverseLogicalChannelParameters.multiplexParameters.
437 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
440 process_h245_channel(skb, ct, ctinfo,
441 protoff, data, dataoff,
443 reverseLogicalChannelParameters.
445 h2250LogicalChannelParameters);
450 if ((olc->options & eOpenLogicalChannel_separateStack) &&
451 olc->forwardLogicalChannelParameters.dataType.choice ==
453 olc->forwardLogicalChannelParameters.dataType.data.application.
454 choice == eDataApplicationCapability_application_t120 &&
455 olc->forwardLogicalChannelParameters.dataType.data.application.
456 t120.choice == eDataProtocolCapability_separateLANStack &&
457 olc->separateStack.networkAddress.choice ==
458 eNetworkAccessParameters_networkAddress_localAreaAddress) {
459 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
460 &olc->separateStack.networkAddress.
469 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
470 enum ip_conntrack_info ctinfo,
471 unsigned int protoff, unsigned char **data, int dataoff,
472 OpenLogicalChannelAck *olca)
474 H2250LogicalChannelAckParameters *ack;
477 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
480 eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
481 (olca->reverseLogicalChannelParameters.options &
482 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
483 && (olca->reverseLogicalChannelParameters.multiplexParameters.
485 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
487 ret = process_h245_channel(skb, ct, ctinfo,
488 protoff, data, dataoff,
490 reverseLogicalChannelParameters.
492 h2250LogicalChannelParameters);
498 eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
499 (olca->forwardMultiplexAckParameters.choice ==
500 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
502 ack = &olca->forwardMultiplexAckParameters.
503 h2250LogicalChannelAckParameters;
505 eH2250LogicalChannelAckParameters_mediaChannel) {
507 ret = expect_rtp_rtcp(skb, ct, ctinfo,
508 protoff, data, dataoff,
515 eH2250LogicalChannelAckParameters_mediaControlChannel) {
517 ret = expect_rtp_rtcp(skb, ct, ctinfo,
518 protoff, data, dataoff,
519 &ack->mediaControlChannel);
525 if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
526 olca->separateStack.networkAddress.choice ==
527 eNetworkAccessParameters_networkAddress_localAreaAddress) {
528 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
529 &olca->separateStack.networkAddress.
538 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
539 enum ip_conntrack_info ctinfo,
540 unsigned int protoff, unsigned char **data, int dataoff,
541 MultimediaSystemControlMessage *mscm)
543 switch (mscm->choice) {
544 case eMultimediaSystemControlMessage_request:
545 if (mscm->request.choice ==
546 eRequestMessage_openLogicalChannel) {
547 return process_olc(skb, ct, ctinfo,
548 protoff, data, dataoff,
549 &mscm->request.openLogicalChannel);
551 pr_debug("nf_ct_h323: H.245 Request %d\n",
552 mscm->request.choice);
554 case eMultimediaSystemControlMessage_response:
555 if (mscm->response.choice ==
556 eResponseMessage_openLogicalChannelAck) {
557 return process_olca(skb, ct, ctinfo,
558 protoff, data, dataoff,
560 openLogicalChannelAck);
562 pr_debug("nf_ct_h323: H.245 Response %d\n",
563 mscm->response.choice);
566 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
573 static int h245_help(struct sk_buff *skb, unsigned int protoff,
574 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
576 static MultimediaSystemControlMessage mscm;
577 unsigned char *data = NULL;
582 /* Until there's been traffic both ways, don't look in packets. */
583 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
586 pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
588 spin_lock_bh(&nf_h323_lock);
590 /* Process each TPKT */
591 while (get_tpkt_data(skb, protoff, ct, ctinfo,
592 &data, &datalen, &dataoff)) {
593 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
594 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
596 /* Decode H.245 signal */
597 ret = DecodeMultimediaSystemControlMessage(data, datalen,
600 pr_debug("nf_ct_h245: decoding error: %s\n",
601 ret == H323_ERROR_BOUND ?
602 "out of bound" : "out of range");
603 /* We don't drop when decoding error */
607 /* Process H.245 signal */
608 if (process_h245(skb, ct, ctinfo, protoff,
609 &data, dataoff, &mscm) < 0)
613 spin_unlock_bh(&nf_h323_lock);
617 spin_unlock_bh(&nf_h323_lock);
618 nf_ct_helper_log(skb, ct, "cannot process H.245 message");
622 static const struct nf_conntrack_expect_policy h245_exp_policy = {
623 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
627 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
630 .tuple.src.l3num = AF_UNSPEC,
631 .tuple.dst.protonum = IPPROTO_UDP,
633 .expect_policy = &h245_exp_policy,
636 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
637 TransportAddress *taddr,
638 union nf_inet_addr *addr, __be16 *port)
640 const unsigned char *p;
643 switch (taddr->choice) {
644 case eTransportAddress_ipAddress:
645 if (nf_ct_l3num(ct) != AF_INET)
647 p = data + taddr->ipAddress.ip;
650 case eTransportAddress_ip6Address:
651 if (nf_ct_l3num(ct) != AF_INET6)
653 p = data + taddr->ip6Address.ip;
660 memcpy(addr, p, len);
661 memset((void *)addr + len, 0, sizeof(*addr) - len);
662 memcpy(port, p + len, sizeof(__be16));
667 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
668 enum ip_conntrack_info ctinfo,
669 unsigned int protoff, unsigned char **data, int dataoff,
670 TransportAddress *taddr)
672 int dir = CTINFO2DIR(ctinfo);
675 union nf_inet_addr addr;
676 struct nf_conntrack_expect *exp;
677 typeof(nat_h245_hook) nat_h245;
679 /* Read h245Address */
680 if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
681 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
685 /* Create expect for h245 connection */
686 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
688 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
689 &ct->tuplehash[!dir].tuple.src.u3,
690 &ct->tuplehash[!dir].tuple.dst.u3,
691 IPPROTO_TCP, NULL, &port);
692 exp->helper = &nf_conntrack_helper_h245;
694 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
695 &ct->tuplehash[!dir].tuple.dst.u3,
696 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
697 (nat_h245 = rcu_dereference(nat_h245_hook)) &&
698 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
699 ct->status & IPS_NAT_MASK) {
701 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
703 } else { /* Conntrack only */
704 if (nf_ct_expect_related(exp, 0) == 0) {
705 pr_debug("nf_ct_q931: expect H.245 ");
706 nf_ct_dump_tuple(&exp->tuple);
711 nf_ct_expect_put(exp);
716 /* If the calling party is on the same side of the forward-to party,
717 * we don't need to track the second call
719 static int callforward_do_filter(struct net *net,
720 const union nf_inet_addr *src,
721 const union nf_inet_addr *dst,
728 struct flowi4 fl1, fl2;
729 struct rtable *rt1, *rt2;
731 memset(&fl1, 0, sizeof(fl1));
734 memset(&fl2, 0, sizeof(fl2));
736 if (!nf_ip_route(net, (struct dst_entry **)&rt1,
737 flowi4_to_flowi(&fl1), false)) {
738 if (!nf_ip_route(net, (struct dst_entry **)&rt2,
739 flowi4_to_flowi(&fl2), false)) {
740 if (rt_nexthop(rt1, fl1.daddr) ==
741 rt_nexthop(rt2, fl2.daddr) &&
742 rt1->dst.dev == rt2->dst.dev)
744 dst_release(&rt2->dst);
746 dst_release(&rt1->dst);
750 #if IS_ENABLED(CONFIG_IPV6)
752 struct rt6_info *rt1, *rt2;
753 struct flowi6 fl1, fl2;
755 memset(&fl1, 0, sizeof(fl1));
756 fl1.daddr = src->in6;
758 memset(&fl2, 0, sizeof(fl2));
759 fl2.daddr = dst->in6;
760 if (!nf_ip6_route(net, (struct dst_entry **)&rt1,
761 flowi6_to_flowi(&fl1), false)) {
762 if (!nf_ip6_route(net, (struct dst_entry **)&rt2,
763 flowi6_to_flowi(&fl2), false)) {
764 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
765 rt6_nexthop(rt2, &fl2.daddr)) &&
766 rt1->dst.dev == rt2->dst.dev)
768 dst_release(&rt2->dst);
770 dst_release(&rt1->dst);
780 static int expect_callforwarding(struct sk_buff *skb,
782 enum ip_conntrack_info ctinfo,
783 unsigned int protoff,
784 unsigned char **data, int dataoff,
785 TransportAddress *taddr)
787 int dir = CTINFO2DIR(ctinfo);
790 union nf_inet_addr addr;
791 struct nf_conntrack_expect *exp;
792 struct net *net = nf_ct_net(ct);
793 typeof(nat_callforwarding_hook) nat_callforwarding;
795 /* Read alternativeAddress */
796 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
799 /* If the calling party is on the same side of the forward-to party,
800 * we don't need to track the second call
802 if (callforward_filter &&
803 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
805 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
809 /* Create expect for the second call leg */
810 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
812 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
813 &ct->tuplehash[!dir].tuple.src.u3, &addr,
814 IPPROTO_TCP, NULL, &port);
815 exp->helper = nf_conntrack_helper_q931;
817 if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
818 &ct->tuplehash[!dir].tuple.dst.u3,
819 sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
820 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
821 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
822 ct->status & IPS_NAT_MASK) {
824 ret = nat_callforwarding(skb, ct, ctinfo,
825 protoff, data, dataoff,
827 } else { /* Conntrack only */
828 if (nf_ct_expect_related(exp, 0) == 0) {
829 pr_debug("nf_ct_q931: expect Call Forwarding ");
830 nf_ct_dump_tuple(&exp->tuple);
835 nf_ct_expect_put(exp);
840 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
841 enum ip_conntrack_info ctinfo,
842 unsigned int protoff,
843 unsigned char **data, int dataoff,
846 int dir = CTINFO2DIR(ctinfo);
850 union nf_inet_addr addr;
851 typeof(set_h225_addr_hook) set_h225_addr;
853 pr_debug("nf_ct_q931: Setup\n");
855 if (setup->options & eSetup_UUIE_h245Address) {
856 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
857 &setup->h245Address);
862 set_h225_addr = rcu_dereference(set_h225_addr_hook);
863 if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
864 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
865 ct->status & IPS_NAT_MASK &&
866 get_h225_addr(ct, *data, &setup->destCallSignalAddress,
868 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
869 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
870 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
871 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
872 ret = set_h225_addr(skb, protoff, data, dataoff,
873 &setup->destCallSignalAddress,
874 &ct->tuplehash[!dir].tuple.src.u3,
875 ct->tuplehash[!dir].tuple.src.u.tcp.port);
880 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
881 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
882 ct->status & IPS_NAT_MASK &&
883 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
885 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
886 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
887 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
888 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
889 ret = set_h225_addr(skb, protoff, data, dataoff,
890 &setup->sourceCallSignalAddress,
891 &ct->tuplehash[!dir].tuple.dst.u3,
892 ct->tuplehash[!dir].tuple.dst.u.tcp.port);
897 if (setup->options & eSetup_UUIE_fastStart) {
898 for (i = 0; i < setup->fastStart.count; i++) {
899 ret = process_olc(skb, ct, ctinfo,
900 protoff, data, dataoff,
901 &setup->fastStart.item[i]);
910 static int process_callproceeding(struct sk_buff *skb,
912 enum ip_conntrack_info ctinfo,
913 unsigned int protoff,
914 unsigned char **data, int dataoff,
915 CallProceeding_UUIE *callproc)
920 pr_debug("nf_ct_q931: CallProceeding\n");
922 if (callproc->options & eCallProceeding_UUIE_h245Address) {
923 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
924 &callproc->h245Address);
929 if (callproc->options & eCallProceeding_UUIE_fastStart) {
930 for (i = 0; i < callproc->fastStart.count; i++) {
931 ret = process_olc(skb, ct, ctinfo,
932 protoff, data, dataoff,
933 &callproc->fastStart.item[i]);
942 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
943 enum ip_conntrack_info ctinfo,
944 unsigned int protoff,
945 unsigned char **data, int dataoff,
946 Connect_UUIE *connect)
951 pr_debug("nf_ct_q931: Connect\n");
953 if (connect->options & eConnect_UUIE_h245Address) {
954 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
955 &connect->h245Address);
960 if (connect->options & eConnect_UUIE_fastStart) {
961 for (i = 0; i < connect->fastStart.count; i++) {
962 ret = process_olc(skb, ct, ctinfo,
963 protoff, data, dataoff,
964 &connect->fastStart.item[i]);
973 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
974 enum ip_conntrack_info ctinfo,
975 unsigned int protoff,
976 unsigned char **data, int dataoff,
977 Alerting_UUIE *alert)
982 pr_debug("nf_ct_q931: Alerting\n");
984 if (alert->options & eAlerting_UUIE_h245Address) {
985 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
986 &alert->h245Address);
991 if (alert->options & eAlerting_UUIE_fastStart) {
992 for (i = 0; i < alert->fastStart.count; i++) {
993 ret = process_olc(skb, ct, ctinfo,
994 protoff, data, dataoff,
995 &alert->fastStart.item[i]);
1004 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1005 enum ip_conntrack_info ctinfo,
1006 unsigned int protoff,
1007 unsigned char **data, int dataoff,
1008 Facility_UUIE *facility)
1013 pr_debug("nf_ct_q931: Facility\n");
1015 if (facility->reason.choice == eFacilityReason_callForwarded) {
1016 if (facility->options & eFacility_UUIE_alternativeAddress)
1017 return expect_callforwarding(skb, ct, ctinfo,
1018 protoff, data, dataoff,
1020 alternativeAddress);
1024 if (facility->options & eFacility_UUIE_h245Address) {
1025 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1026 &facility->h245Address);
1031 if (facility->options & eFacility_UUIE_fastStart) {
1032 for (i = 0; i < facility->fastStart.count; i++) {
1033 ret = process_olc(skb, ct, ctinfo,
1034 protoff, data, dataoff,
1035 &facility->fastStart.item[i]);
1044 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1045 enum ip_conntrack_info ctinfo,
1046 unsigned int protoff,
1047 unsigned char **data, int dataoff,
1048 Progress_UUIE *progress)
1053 pr_debug("nf_ct_q931: Progress\n");
1055 if (progress->options & eProgress_UUIE_h245Address) {
1056 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1057 &progress->h245Address);
1062 if (progress->options & eProgress_UUIE_fastStart) {
1063 for (i = 0; i < progress->fastStart.count; i++) {
1064 ret = process_olc(skb, ct, ctinfo,
1065 protoff, data, dataoff,
1066 &progress->fastStart.item[i]);
1075 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1076 enum ip_conntrack_info ctinfo,
1077 unsigned int protoff, unsigned char **data, int dataoff,
1080 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1084 switch (pdu->h323_message_body.choice) {
1085 case eH323_UU_PDU_h323_message_body_setup:
1086 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1087 &pdu->h323_message_body.setup);
1089 case eH323_UU_PDU_h323_message_body_callProceeding:
1090 ret = process_callproceeding(skb, ct, ctinfo,
1091 protoff, data, dataoff,
1092 &pdu->h323_message_body.
1095 case eH323_UU_PDU_h323_message_body_connect:
1096 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1097 &pdu->h323_message_body.connect);
1099 case eH323_UU_PDU_h323_message_body_alerting:
1100 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1101 &pdu->h323_message_body.alerting);
1103 case eH323_UU_PDU_h323_message_body_facility:
1104 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1105 &pdu->h323_message_body.facility);
1107 case eH323_UU_PDU_h323_message_body_progress:
1108 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1109 &pdu->h323_message_body.progress);
1112 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1113 pdu->h323_message_body.choice);
1120 if (pdu->options & eH323_UU_PDU_h245Control) {
1121 for (i = 0; i < pdu->h245Control.count; i++) {
1122 ret = process_h245(skb, ct, ctinfo,
1123 protoff, data, dataoff,
1124 &pdu->h245Control.item[i]);
1133 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1134 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1137 unsigned char *data = NULL;
1142 /* Until there's been traffic both ways, don't look in packets. */
1143 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1146 pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1148 spin_lock_bh(&nf_h323_lock);
1150 /* Process each TPKT */
1151 while (get_tpkt_data(skb, protoff, ct, ctinfo,
1152 &data, &datalen, &dataoff)) {
1153 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1154 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1156 /* Decode Q.931 signal */
1157 ret = DecodeQ931(data, datalen, &q931);
1159 pr_debug("nf_ct_q931: decoding error: %s\n",
1160 ret == H323_ERROR_BOUND ?
1161 "out of bound" : "out of range");
1162 /* We don't drop when decoding error */
1166 /* Process Q.931 signal */
1167 if (process_q931(skb, ct, ctinfo, protoff,
1168 &data, dataoff, &q931) < 0)
1172 spin_unlock_bh(&nf_h323_lock);
1176 spin_unlock_bh(&nf_h323_lock);
1177 nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1181 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1182 /* T.120 and H.245 */
1183 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4,
1187 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1191 .tuple.src.l3num = AF_INET,
1192 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1193 .tuple.dst.protonum = IPPROTO_TCP,
1195 .expect_policy = &q931_exp_policy,
1200 .tuple.src.l3num = AF_INET6,
1201 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT),
1202 .tuple.dst.protonum = IPPROTO_TCP,
1204 .expect_policy = &q931_exp_policy,
1208 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1211 const struct udphdr *uh;
1215 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1218 dataoff = protoff + sizeof(_uh);
1219 if (dataoff >= skb->len)
1221 *datalen = skb->len - dataoff;
1222 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1225 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1226 union nf_inet_addr *addr,
1229 struct net *net = nf_ct_net(ct);
1230 struct nf_conntrack_expect *exp;
1231 struct nf_conntrack_tuple tuple;
1233 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1234 tuple.src.u.tcp.port = 0;
1235 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1236 tuple.dst.u.tcp.port = port;
1237 tuple.dst.protonum = IPPROTO_TCP;
1239 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1240 if (exp && exp->master == ct)
1245 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1246 enum ip_conntrack_info ctinfo,
1247 unsigned int protoff, unsigned char **data,
1248 TransportAddress *taddr, int count)
1250 struct nf_ct_h323_master *info = nfct_help_data(ct);
1251 int dir = CTINFO2DIR(ctinfo);
1255 union nf_inet_addr addr;
1256 struct nf_conntrack_expect *exp;
1257 typeof(nat_q931_hook) nat_q931;
1259 /* Look for the first related address */
1260 for (i = 0; i < count; i++) {
1261 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1262 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1263 sizeof(addr)) == 0 && port != 0)
1267 if (i >= count) /* Not found */
1270 /* Create expect for Q.931 */
1271 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1273 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1274 gkrouted_only ? /* only accept calls from GK? */
1275 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1276 &ct->tuplehash[!dir].tuple.dst.u3,
1277 IPPROTO_TCP, NULL, &port);
1278 exp->helper = nf_conntrack_helper_q931;
1279 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */
1281 nat_q931 = rcu_dereference(nat_q931_hook);
1282 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1283 ct->status & IPS_NAT_MASK) { /* Need NAT */
1284 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1285 taddr, i, port, exp);
1286 } else { /* Conntrack only */
1287 if (nf_ct_expect_related(exp, 0) == 0) {
1288 pr_debug("nf_ct_ras: expect Q.931 ");
1289 nf_ct_dump_tuple(&exp->tuple);
1291 /* Save port for looking up expect in processing RCF */
1292 info->sig_port[dir] = port;
1297 nf_ct_expect_put(exp);
1302 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1303 enum ip_conntrack_info ctinfo,
1304 unsigned int protoff,
1305 unsigned char **data, GatekeeperRequest *grq)
1307 typeof(set_ras_addr_hook) set_ras_addr;
1309 pr_debug("nf_ct_ras: GRQ\n");
1311 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1312 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1313 ct->status & IPS_NAT_MASK) /* NATed */
1314 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1315 &grq->rasAddress, 1);
1319 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1320 enum ip_conntrack_info ctinfo,
1321 unsigned int protoff,
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) == 0) {
1353 pr_debug("nf_ct_ras: expect RAS ");
1354 nf_ct_dump_tuple(&exp->tuple);
1358 nf_ct_expect_put(exp);
1363 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1364 enum ip_conntrack_info ctinfo,
1365 unsigned int protoff,
1366 unsigned char **data, RegistrationRequest *rrq)
1368 struct nf_ct_h323_master *info = nfct_help_data(ct);
1370 typeof(set_ras_addr_hook) set_ras_addr;
1372 pr_debug("nf_ct_ras: RRQ\n");
1374 ret = expect_q931(skb, ct, ctinfo, protoff, data,
1375 rrq->callSignalAddress.item,
1376 rrq->callSignalAddress.count);
1380 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1381 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1382 ct->status & IPS_NAT_MASK) {
1383 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1384 rrq->rasAddress.item,
1385 rrq->rasAddress.count);
1390 if (rrq->options & eRegistrationRequest_timeToLive) {
1391 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1392 info->timeout = rrq->timeToLive;
1394 info->timeout = default_rrq_ttl;
1399 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1400 enum ip_conntrack_info ctinfo,
1401 unsigned int protoff,
1402 unsigned char **data, RegistrationConfirm *rcf)
1404 struct nf_ct_h323_master *info = nfct_help_data(ct);
1405 int dir = CTINFO2DIR(ctinfo);
1407 struct nf_conntrack_expect *exp;
1408 typeof(set_sig_addr_hook) set_sig_addr;
1410 pr_debug("nf_ct_ras: RCF\n");
1412 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1413 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1414 ct->status & IPS_NAT_MASK) {
1415 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1416 rcf->callSignalAddress.item,
1417 rcf->callSignalAddress.count);
1422 if (rcf->options & eRegistrationConfirm_timeToLive) {
1423 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1424 info->timeout = rcf->timeToLive;
1427 if (info->timeout > 0) {
1428 pr_debug("nf_ct_ras: set RAS connection timeout to "
1429 "%u seconds\n", info->timeout);
1430 nf_ct_refresh(ct, skb, info->timeout * HZ);
1432 /* Set expect timeout */
1433 spin_lock_bh(&nf_conntrack_expect_lock);
1434 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1435 info->sig_port[!dir]);
1437 pr_debug("nf_ct_ras: set Q.931 expect "
1438 "timeout to %u seconds for",
1440 nf_ct_dump_tuple(&exp->tuple);
1441 mod_timer_pending(&exp->timeout,
1442 jiffies + info->timeout * HZ);
1444 spin_unlock_bh(&nf_conntrack_expect_lock);
1450 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1451 enum ip_conntrack_info ctinfo,
1452 unsigned int protoff,
1453 unsigned char **data, UnregistrationRequest *urq)
1455 struct nf_ct_h323_master *info = nfct_help_data(ct);
1456 int dir = CTINFO2DIR(ctinfo);
1458 typeof(set_sig_addr_hook) set_sig_addr;
1460 pr_debug("nf_ct_ras: URQ\n");
1462 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1463 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1464 ct->status & IPS_NAT_MASK) {
1465 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1466 urq->callSignalAddress.item,
1467 urq->callSignalAddress.count);
1472 /* Clear old expect */
1473 nf_ct_remove_expectations(ct);
1474 info->sig_port[dir] = 0;
1475 info->sig_port[!dir] = 0;
1477 /* Give it 30 seconds for UCF or URJ */
1478 nf_ct_refresh(ct, skb, 30 * HZ);
1483 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1484 enum ip_conntrack_info ctinfo,
1485 unsigned int protoff,
1486 unsigned char **data, AdmissionRequest *arq)
1488 const struct nf_ct_h323_master *info = nfct_help_data(ct);
1489 int dir = CTINFO2DIR(ctinfo);
1491 union nf_inet_addr addr;
1492 typeof(set_h225_addr_hook) set_h225_addr;
1494 pr_debug("nf_ct_ras: ARQ\n");
1496 set_h225_addr = rcu_dereference(set_h225_addr_hook);
1497 if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1498 get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1500 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1501 port == info->sig_port[dir] &&
1502 nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1503 set_h225_addr && ct->status & IPS_NAT_MASK) {
1505 return set_h225_addr(skb, protoff, data, 0,
1506 &arq->destCallSignalAddress,
1507 &ct->tuplehash[!dir].tuple.dst.u3,
1508 info->sig_port[!dir]);
1511 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1512 get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1514 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1515 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1516 ct->status & IPS_NAT_MASK) {
1518 return set_h225_addr(skb, protoff, data, 0,
1519 &arq->srcCallSignalAddress,
1520 &ct->tuplehash[!dir].tuple.dst.u3,
1527 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1528 enum ip_conntrack_info ctinfo,
1529 unsigned int protoff,
1530 unsigned char **data, AdmissionConfirm *acf)
1532 int dir = CTINFO2DIR(ctinfo);
1535 union nf_inet_addr addr;
1536 struct nf_conntrack_expect *exp;
1537 typeof(set_sig_addr_hook) set_sig_addr;
1539 pr_debug("nf_ct_ras: ACF\n");
1541 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1545 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1547 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1548 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1549 ct->status & IPS_NAT_MASK)
1550 return set_sig_addr(skb, ct, ctinfo, protoff, data,
1551 &acf->destCallSignalAddress, 1);
1555 /* Need new expect */
1556 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1558 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1559 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1560 IPPROTO_TCP, NULL, &port);
1561 exp->flags = NF_CT_EXPECT_PERMANENT;
1562 exp->helper = nf_conntrack_helper_q931;
1564 if (nf_ct_expect_related(exp, 0) == 0) {
1565 pr_debug("nf_ct_ras: expect Q.931 ");
1566 nf_ct_dump_tuple(&exp->tuple);
1570 nf_ct_expect_put(exp);
1575 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1576 enum ip_conntrack_info ctinfo,
1577 unsigned int protoff,
1578 unsigned char **data, LocationRequest *lrq)
1580 typeof(set_ras_addr_hook) set_ras_addr;
1582 pr_debug("nf_ct_ras: LRQ\n");
1584 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1585 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1586 ct->status & IPS_NAT_MASK)
1587 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1588 &lrq->replyAddress, 1);
1592 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1593 enum ip_conntrack_info ctinfo,
1594 unsigned int protoff,
1595 unsigned char **data, LocationConfirm *lcf)
1597 int dir = CTINFO2DIR(ctinfo);
1600 union nf_inet_addr addr;
1601 struct nf_conntrack_expect *exp;
1603 pr_debug("nf_ct_ras: LCF\n");
1605 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1609 /* Need new expect for call signal */
1610 if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1612 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1613 &ct->tuplehash[!dir].tuple.src.u3, &addr,
1614 IPPROTO_TCP, NULL, &port);
1615 exp->flags = NF_CT_EXPECT_PERMANENT;
1616 exp->helper = nf_conntrack_helper_q931;
1618 if (nf_ct_expect_related(exp, 0) == 0) {
1619 pr_debug("nf_ct_ras: expect Q.931 ");
1620 nf_ct_dump_tuple(&exp->tuple);
1624 nf_ct_expect_put(exp);
1626 /* Ignore rasAddress */
1631 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1632 enum ip_conntrack_info ctinfo,
1633 unsigned int protoff,
1634 unsigned char **data, InfoRequestResponse *irr)
1637 typeof(set_ras_addr_hook) set_ras_addr;
1638 typeof(set_sig_addr_hook) set_sig_addr;
1640 pr_debug("nf_ct_ras: IRR\n");
1642 set_ras_addr = rcu_dereference(set_ras_addr_hook);
1643 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1644 ct->status & IPS_NAT_MASK) {
1645 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1646 &irr->rasAddress, 1);
1651 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1652 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1653 ct->status & IPS_NAT_MASK) {
1654 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1655 irr->callSignalAddress.item,
1656 irr->callSignalAddress.count);
1664 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1665 enum ip_conntrack_info ctinfo,
1666 unsigned int protoff,
1667 unsigned char **data, RasMessage *ras)
1669 switch (ras->choice) {
1670 case eRasMessage_gatekeeperRequest:
1671 return process_grq(skb, ct, ctinfo, protoff, data,
1672 &ras->gatekeeperRequest);
1673 case eRasMessage_gatekeeperConfirm:
1674 return process_gcf(skb, ct, ctinfo, protoff, data,
1675 &ras->gatekeeperConfirm);
1676 case eRasMessage_registrationRequest:
1677 return process_rrq(skb, ct, ctinfo, protoff, data,
1678 &ras->registrationRequest);
1679 case eRasMessage_registrationConfirm:
1680 return process_rcf(skb, ct, ctinfo, protoff, data,
1681 &ras->registrationConfirm);
1682 case eRasMessage_unregistrationRequest:
1683 return process_urq(skb, ct, ctinfo, protoff, data,
1684 &ras->unregistrationRequest);
1685 case eRasMessage_admissionRequest:
1686 return process_arq(skb, ct, ctinfo, protoff, data,
1687 &ras->admissionRequest);
1688 case eRasMessage_admissionConfirm:
1689 return process_acf(skb, ct, ctinfo, protoff, data,
1690 &ras->admissionConfirm);
1691 case eRasMessage_locationRequest:
1692 return process_lrq(skb, ct, ctinfo, protoff, data,
1693 &ras->locationRequest);
1694 case eRasMessage_locationConfirm:
1695 return process_lcf(skb, ct, ctinfo, protoff, data,
1696 &ras->locationConfirm);
1697 case eRasMessage_infoRequestResponse:
1698 return process_irr(skb, ct, ctinfo, protoff, data,
1699 &ras->infoRequestResponse);
1701 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1708 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1709 struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1711 static RasMessage ras;
1712 unsigned char *data;
1716 pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1718 spin_lock_bh(&nf_h323_lock);
1721 data = get_udp_data(skb, protoff, &datalen);
1724 pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1725 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1727 /* Decode RAS message */
1728 ret = DecodeRasMessage(data, datalen, &ras);
1730 pr_debug("nf_ct_ras: decoding error: %s\n",
1731 ret == H323_ERROR_BOUND ?
1732 "out of bound" : "out of range");
1736 /* Process RAS message */
1737 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1741 spin_unlock_bh(&nf_h323_lock);
1745 spin_unlock_bh(&nf_h323_lock);
1746 nf_ct_helper_log(skb, ct, "cannot process RAS message");
1750 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1755 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1759 .tuple.src.l3num = AF_INET,
1760 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1761 .tuple.dst.protonum = IPPROTO_UDP,
1763 .expect_policy = &ras_exp_policy,
1768 .tuple.src.l3num = AF_INET6,
1769 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT),
1770 .tuple.dst.protonum = IPPROTO_UDP,
1772 .expect_policy = &ras_exp_policy,
1776 static int __init h323_helper_init(void)
1780 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1783 ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1784 ARRAY_SIZE(nf_conntrack_helper_q931));
1787 ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1788 ARRAY_SIZE(nf_conntrack_helper_ras));
1794 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1795 ARRAY_SIZE(nf_conntrack_helper_q931));
1797 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1801 static void __exit h323_helper_exit(void)
1803 nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1804 ARRAY_SIZE(nf_conntrack_helper_ras));
1805 nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1806 ARRAY_SIZE(nf_conntrack_helper_q931));
1807 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1810 static void __exit nf_conntrack_h323_fini(void)
1814 pr_debug("nf_ct_h323: fini\n");
1817 static int __init nf_conntrack_h323_init(void)
1821 NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1823 h323_buffer = kmalloc(65536, GFP_KERNEL);
1826 ret = h323_helper_init();
1829 pr_debug("nf_ct_h323: init success\n");
1836 module_init(nf_conntrack_h323_init);
1837 module_exit(nf_conntrack_h323_fini);
1839 EXPORT_SYMBOL_GPL(get_h225_addr);
1840 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1841 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1842 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1843 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1844 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1845 EXPORT_SYMBOL_GPL(nat_t120_hook);
1846 EXPORT_SYMBOL_GPL(nat_h245_hook);
1847 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1848 EXPORT_SYMBOL_GPL(nat_q931_hook);
1850 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1851 MODULE_DESCRIPTION("H.323 connection tracking helper");
1852 MODULE_LICENSE("GPL");
1853 MODULE_ALIAS("ip_conntrack_h323");
1854 MODULE_ALIAS_NFCT_HELPER("RAS");
1855 MODULE_ALIAS_NFCT_HELPER("Q.931");
1856 MODULE_ALIAS_NFCT_HELPER("H.245");