--- /dev/null
+/*
+ * H.323 connection tracking helper
+ *
+ * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
+ *
+ * This source code is licensed under General Public License version 2.
+ *
+ * Based on the 'brute force' H.323 connection tracking module by
+ * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * For more information, please see http://nath323.sourceforge.net/
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/netfilter.h>
+#include <linux/ip.h>
+#include <net/tcp.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_conntrack_core.h>
+#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
+#include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
+#include <linux/netfilter_ipv4/ip_conntrack_h323.h>
+#include <linux/moduleparam.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Parameters */
+static unsigned int default_rrq_ttl = 300;
+module_param(default_rrq_ttl, uint, 0600);
+MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
+
+static int gkrouted_only = 1;
+module_param(gkrouted_only, int, 0600);
+MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
+
+/* Hooks for NAT */
+int (*set_h245_addr_hook) (struct sk_buff ** pskb,
+ unsigned char **data, int dataoff,
+ H245_TransportAddress * addr,
+ u_int32_t ip, u_int16_t port);
+int (*set_h225_addr_hook) (struct sk_buff ** pskb,
+ unsigned char **data, int dataoff,
+ TransportAddress * addr,
+ u_int32_t ip, u_int16_t port);
+int (*set_sig_addr_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data,
+ TransportAddress * addr, int count);
+int (*set_ras_addr_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data,
+ TransportAddress * addr, int count);
+int (*nat_rtp_rtcp_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ H245_TransportAddress * addr,
+ u_int16_t port, u_int16_t rtp_port,
+ struct ip_conntrack_expect * rtp_exp,
+ struct ip_conntrack_expect * rtcp_exp);
+int (*nat_t120_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ H245_TransportAddress * addr, u_int16_t port,
+ struct ip_conntrack_expect * exp);
+int (*nat_h245_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ TransportAddress * addr, u_int16_t port,
+ struct ip_conntrack_expect * exp);
+int (*nat_q931_hook) (struct sk_buff ** pskb,
+ struct ip_conntrack * ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, TransportAddress * addr, int idx,
+ u_int16_t port, struct ip_conntrack_expect * exp);
+
+
+static DEFINE_SPINLOCK(ip_h323_lock);
+static char *h323_buffer;
+
+/****************************************************************************/
+static int get_tpkt_data(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int *datalen, int *dataoff)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int dir = CTINFO2DIR(ctinfo);
+ struct tcphdr _tcph, *th;
+ int tcpdatalen;
+ int tcpdataoff;
+ unsigned char *tpkt;
+ int tpktlen;
+ int tpktoff;
+
+ /* Get TCP header */
+ th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl * 4,
+ sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ return 0;
+
+ /* Get TCP data offset */
+ tcpdataoff = (*pskb)->nh.iph->ihl * 4 + th->doff * 4;
+
+ /* Get TCP data length */
+ tcpdatalen = (*pskb)->len - tcpdataoff;
+ if (tcpdatalen <= 0) /* No TCP data */
+ goto clear_out;
+
+ if (*data == NULL) { /* first TPKT */
+ /* Get first TPKT pointer */
+ tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen,
+ h323_buffer);
+ BUG_ON(tpkt == NULL);
+
+ /* Validate TPKT identifier */
+ if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
+ /* Netmeeting sends TPKT header and data separately */
+ if (info->tpkt_len[dir] > 0) {
+ DEBUGP("ip_ct_h323: previous packet "
+ "indicated separate TPKT data of %hu "
+ "bytes\n", info->tpkt_len[dir]);
+ if (info->tpkt_len[dir] <= tcpdatalen) {
+ /* Yes, there was a TPKT header
+ * received */
+ *data = tpkt;
+ *datalen = info->tpkt_len[dir];
+ *dataoff = 0;
+ goto out;
+ }
+
+ /* Fragmented TPKT */
+ if (net_ratelimit())
+ printk("ip_ct_h323: "
+ "fragmented TPKT\n");
+ goto clear_out;
+ }
+
+ /* It is not even a TPKT */
+ return 0;
+ }
+ tpktoff = 0;
+ } else { /* Next TPKT */
+ tpktoff = *dataoff + *datalen;
+ tcpdatalen -= tpktoff;
+ if (tcpdatalen <= 4) /* No more TPKT */
+ goto clear_out;
+ tpkt = *data + *datalen;
+
+ /* Validate TPKT identifier */
+ if (tpkt[0] != 0x03 || tpkt[1] != 0)
+ goto clear_out;
+ }
+
+ /* Validate TPKT length */
+ tpktlen = tpkt[2] * 256 + tpkt[3];
+ if (tpktlen < 4)
+ goto clear_out;
+ if (tpktlen > tcpdatalen) {
+ if (tcpdatalen == 4) { /* Separate TPKT header */
+ /* Netmeeting sends TPKT header and data separately */
+ DEBUGP("ip_ct_h323: separate TPKT header indicates "
+ "there will be TPKT data of %hu bytes\n",
+ tpktlen - 4);
+ info->tpkt_len[dir] = tpktlen - 4;
+ return 0;
+ }
+
+ if (net_ratelimit())
+ printk("ip_ct_h323: incomplete TPKT (fragmented?)\n");
+ goto clear_out;
+ }
+
+ /* This is the encapsulated data */
+ *data = tpkt + 4;
+ *datalen = tpktlen - 4;
+ *dataoff = tpktoff + 4;
+
+ out:
+ /* Clear TPKT length */
+ info->tpkt_len[dir] = 0;
+ return 1;
+
+ clear_out:
+ info->tpkt_len[dir] = 0;
+ return 0;
+}
+
+/****************************************************************************/
+static int get_h245_addr(unsigned char *data, H245_TransportAddress * addr,
+ u_int32_t * ip, u_int16_t * port)
+{
+ unsigned char *p;
+
+ if (addr->choice != eH245_TransportAddress_unicastAddress ||
+ addr->unicastAddress.choice != eUnicastAddress_iPAddress)
+ return 0;
+
+ p = data + addr->unicastAddress.iPAddress.network;
+ *ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
+ *port = (p[4] << 8) | (p[5]);
+
+ return 1;
+}
+
+/****************************************************************************/
+static int expect_rtp_rtcp(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ H245_TransportAddress * addr)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ u_int16_t rtp_port;
+ struct ip_conntrack_expect *rtp_exp;
+ struct ip_conntrack_expect *rtcp_exp;
+
+ /* Read RTP or RTCP address */
+ if (!get_h245_addr(*data, addr, &ip, &port) ||
+ ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
+ return 0;
+
+ /* RTP port is even */
+ rtp_port = port & (~1);
+
+ /* Create expect for RTP */
+ if ((rtp_exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ rtp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ rtp_exp->tuple.src.u.udp.port = 0;
+ rtp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+ rtp_exp->tuple.dst.u.udp.port = htons(rtp_port);
+ rtp_exp->tuple.dst.protonum = IPPROTO_UDP;
+ rtp_exp->mask.src.ip = 0xFFFFFFFF;
+ rtp_exp->mask.src.u.udp.port = 0;
+ rtp_exp->mask.dst.ip = 0xFFFFFFFF;
+ rtp_exp->mask.dst.u.udp.port = 0xFFFF;
+ rtp_exp->mask.dst.protonum = 0xFF;
+ rtp_exp->flags = 0;
+
+ /* Create expect for RTCP */
+ if ((rtcp_exp = ip_conntrack_expect_alloc(ct)) == NULL) {
+ ip_conntrack_expect_put(rtp_exp);
+ return -1;
+ }
+ rtcp_exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ rtcp_exp->tuple.src.u.udp.port = 0;
+ rtcp_exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+ rtcp_exp->tuple.dst.u.udp.port = htons(rtp_port + 1);
+ rtcp_exp->tuple.dst.protonum = IPPROTO_UDP;
+ rtcp_exp->mask.src.ip = 0xFFFFFFFF;
+ rtcp_exp->mask.src.u.udp.port = 0;
+ rtcp_exp->mask.dst.ip = 0xFFFFFFFF;
+ rtcp_exp->mask.dst.u.udp.port = 0xFFFF;
+ rtcp_exp->mask.dst.protonum = 0xFF;
+ rtcp_exp->flags = 0;
+
+ if (ct->tuplehash[dir].tuple.src.ip !=
+ ct->tuplehash[!dir].tuple.dst.ip && nat_rtp_rtcp_hook) {
+ /* NAT needed */
+ ret = nat_rtp_rtcp_hook(pskb, ct, ctinfo, data, dataoff,
+ addr, port, rtp_port, rtp_exp,
+ rtcp_exp);
+ } else { /* Conntrack only */
+ rtp_exp->expectfn = NULL;
+ rtcp_exp->expectfn = NULL;
+
+ if (ip_conntrack_expect_related(rtp_exp) == 0) {
+ if (ip_conntrack_expect_related(rtcp_exp) == 0) {
+ DEBUGP("ip_ct_h323: expect RTP "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(rtp_exp->tuple.src.ip),
+ ntohs(rtp_exp->tuple.src.u.udp.port),
+ NIPQUAD(rtp_exp->tuple.dst.ip),
+ ntohs(rtp_exp->tuple.dst.u.udp.port));
+ DEBUGP("ip_ct_h323: expect RTCP "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(rtcp_exp->tuple.src.ip),
+ ntohs(rtcp_exp->tuple.src.u.udp.port),
+ NIPQUAD(rtcp_exp->tuple.dst.ip),
+ ntohs(rtcp_exp->tuple.dst.u.udp.port));
+ } else {
+ ip_conntrack_unexpect_related(rtp_exp);
+ ret = -1;
+ }
+ } else
+ ret = -1;
+ }
+
+ ip_conntrack_expect_put(rtp_exp);
+ ip_conntrack_expect_put(rtcp_exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int expect_t120(struct sk_buff **pskb,
+ struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ H245_TransportAddress * addr)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp = NULL;
+
+ /* Read T.120 address */
+ if (!get_h245_addr(*data, addr, &ip, &port) ||
+ ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
+ return 0;
+
+ /* Create expect for T.120 connections */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_TCP;
+ exp->mask.src.ip = 0xFFFFFFFF;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple channels */
+
+ if (ct->tuplehash[dir].tuple.src.ip !=
+ ct->tuplehash[!dir].tuple.dst.ip && nat_t120_hook) {
+ /* NAT needed */
+ ret = nat_t120_hook(pskb, ct, ctinfo, data, dataoff, addr,
+ port, exp);
+ } else { /* Conntrack only */
+ exp->expectfn = NULL;
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_h323: expect T.120 "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+ } else
+ ret = -1;
+ }
+
+ ip_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_h245_channel(struct sk_buff **pskb,
+ struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ H2250LogicalChannelParameters * channel)
+{
+ int ret;
+
+ if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
+ /* RTP */
+ ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
+ &channel->mediaChannel);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (channel->
+ options & eH2250LogicalChannelParameters_mediaControlChannel) {
+ /* RTCP */
+ ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
+ &channel->mediaControlChannel);
+ if (ret < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_olc(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ OpenLogicalChannel * olc)
+{
+ int ret;
+
+ DEBUGP("ip_ct_h323: OpenLogicalChannel\n");
+
+ if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
+ eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
+ {
+ ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
+ &olc->
+ forwardLogicalChannelParameters.
+ multiplexParameters.
+ h2250LogicalChannelParameters);
+ if (ret < 0)
+ return -1;
+ }
+
+ if ((olc->options &
+ eOpenLogicalChannel_reverseLogicalChannelParameters) &&
+ (olc->reverseLogicalChannelParameters.options &
+ eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
+ && (olc->reverseLogicalChannelParameters.multiplexParameters.
+ choice ==
+ eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
+ {
+ ret =
+ process_h245_channel(pskb, ct, ctinfo, data, dataoff,
+ &olc->
+ reverseLogicalChannelParameters.
+ multiplexParameters.
+ h2250LogicalChannelParameters);
+ if (ret < 0)
+ return -1;
+ }
+
+ if ((olc->options & eOpenLogicalChannel_separateStack) &&
+ olc->forwardLogicalChannelParameters.dataType.choice ==
+ eDataType_data &&
+ olc->forwardLogicalChannelParameters.dataType.data.application.
+ choice == eDataApplicationCapability_application_t120 &&
+ olc->forwardLogicalChannelParameters.dataType.data.application.
+ t120.choice == eDataProtocolCapability_separateLANStack &&
+ olc->separateStack.networkAddress.choice ==
+ eNetworkAccessParameters_networkAddress_localAreaAddress) {
+ ret = expect_t120(pskb, ct, ctinfo, data, dataoff,
+ &olc->separateStack.networkAddress.
+ localAreaAddress);
+ if (ret < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_olca(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ OpenLogicalChannelAck * olca)
+{
+ H2250LogicalChannelAckParameters *ack;
+ int ret;
+
+ DEBUGP("ip_ct_h323: OpenLogicalChannelAck\n");
+
+ if ((olca->options &
+ eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
+ (olca->reverseLogicalChannelParameters.options &
+ eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
+ && (olca->reverseLogicalChannelParameters.multiplexParameters.
+ choice ==
+ eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
+ {
+ ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff,
+ &olca->
+ reverseLogicalChannelParameters.
+ multiplexParameters.
+ h2250LogicalChannelParameters);
+ if (ret < 0)
+ return -1;
+ }
+
+ if ((olca->options &
+ eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
+ (olca->forwardMultiplexAckParameters.choice ==
+ eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
+ {
+ ack = &olca->forwardMultiplexAckParameters.
+ h2250LogicalChannelAckParameters;
+ if (ack->options &
+ eH2250LogicalChannelAckParameters_mediaChannel) {
+ /* RTP */
+ ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
+ &ack->mediaChannel);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (ack->options &
+ eH2250LogicalChannelAckParameters_mediaControlChannel) {
+ /* RTCP */
+ ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
+ &ack->mediaControlChannel);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ MultimediaSystemControlMessage * mscm)
+{
+ switch (mscm->choice) {
+ case eMultimediaSystemControlMessage_request:
+ if (mscm->request.choice ==
+ eRequestMessage_openLogicalChannel) {
+ return process_olc(pskb, ct, ctinfo, data, dataoff,
+ &mscm->request.openLogicalChannel);
+ }
+ DEBUGP("ip_ct_h323: H.245 Request %d\n",
+ mscm->request.choice);
+ break;
+ case eMultimediaSystemControlMessage_response:
+ if (mscm->response.choice ==
+ eResponseMessage_openLogicalChannelAck) {
+ return process_olca(pskb, ct, ctinfo, data, dataoff,
+ &mscm->response.
+ openLogicalChannelAck);
+ }
+ DEBUGP("ip_ct_h323: H.245 Response %d\n",
+ mscm->response.choice);
+ break;
+ default:
+ DEBUGP("ip_ct_h323: H.245 signal %d\n", mscm->choice);
+ break;
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int h245_help(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ static MultimediaSystemControlMessage mscm;
+ unsigned char *data = NULL;
+ int datalen;
+ int dataoff;
+ int ret;
+
+ /* Until there's been traffic both ways, don't look in packets. */
+ if (ctinfo != IP_CT_ESTABLISHED
+ && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
+ return NF_ACCEPT;
+ }
+ DEBUGP("ip_ct_h245: skblen = %u\n", (*pskb)->len);
+
+ spin_lock_bh(&ip_h323_lock);
+
+ /* Process each TPKT */
+ while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
+ DEBUGP("ip_ct_h245: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
+ NIPQUAD((*pskb)->nh.iph->saddr),
+ NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+
+ /* Decode H.245 signal */
+ ret = DecodeMultimediaSystemControlMessage(data, datalen,
+ &mscm);
+ if (ret < 0) {
+ if (net_ratelimit())
+ printk("ip_ct_h245: decoding error: %s\n",
+ ret == H323_ERROR_BOUND ?
+ "out of bound" : "out of range");
+ /* We don't drop when decoding error */
+ break;
+ }
+
+ /* Process H.245 signal */
+ if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0)
+ goto drop;
+ }
+
+ spin_unlock_bh(&ip_h323_lock);
+ return NF_ACCEPT;
+
+ drop:
+ spin_unlock_bh(&ip_h323_lock);
+ if (net_ratelimit())
+ printk("ip_ct_h245: packet dropped\n");
+ return NF_DROP;
+}
+
+/****************************************************************************/
+static struct ip_conntrack_helper ip_conntrack_helper_h245 = {
+ .name = "H.245",
+ .me = THIS_MODULE,
+ .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */ ,
+ .timeout = 240,
+ .tuple = {.dst = {.protonum = IPPROTO_TCP}},
+ .mask = {.src = {.u = {0xFFFF}},
+ .dst = {.protonum = 0xFF}},
+ .help = h245_help
+};
+
+/****************************************************************************/
+void ip_conntrack_h245_expect(struct ip_conntrack *new,
+ struct ip_conntrack_expect *this)
+{
+ write_lock_bh(&ip_conntrack_lock);
+ new->helper = &ip_conntrack_helper_h245;
+ write_unlock_bh(&ip_conntrack_lock);
+}
+
+/****************************************************************************/
+int get_h225_addr(unsigned char *data, TransportAddress * addr,
+ u_int32_t * ip, u_int16_t * port)
+{
+ unsigned char *p;
+
+ if (addr->choice != eTransportAddress_ipAddress)
+ return 0;
+
+ p = data + addr->ipAddress.ip;
+ *ip = htonl((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]));
+ *port = (p[4] << 8) | (p[5]);
+
+ return 1;
+}
+
+/****************************************************************************/
+static int expect_h245(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ TransportAddress * addr)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp = NULL;
+
+ /* Read h245Address */
+ if (!get_h225_addr(*data, addr, &ip, &port) ||
+ ip != ct->tuplehash[dir].tuple.src.ip || port == 0)
+ return 0;
+
+ /* Create expect for h245 connection */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_TCP;
+ exp->mask.src.ip = 0xFFFFFFFF;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = 0;
+
+ if (ct->tuplehash[dir].tuple.src.ip !=
+ ct->tuplehash[!dir].tuple.dst.ip && nat_h245_hook) {
+ /* NAT needed */
+ ret = nat_h245_hook(pskb, ct, ctinfo, data, dataoff, addr,
+ port, exp);
+ } else { /* Conntrack only */
+ exp->expectfn = ip_conntrack_h245_expect;
+
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_q931: expect H.245 "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+ } else
+ ret = -1;
+ }
+
+ ip_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_setup(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Setup_UUIE * setup)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret;
+ int i;
+ u_int32_t ip;
+ u_int16_t port;
+
+ DEBUGP("ip_ct_q931: Setup\n");
+
+ if (setup->options & eSetup_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &setup->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
+ (set_h225_addr_hook) &&
+ get_h225_addr(*data, &setup->destCallSignalAddress, &ip, &port) &&
+ ip != ct->tuplehash[!dir].tuple.src.ip) {
+ DEBUGP("ip_ct_q931: set destCallSignalAddress "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(ip), port,
+ NIPQUAD(ct->tuplehash[!dir].tuple.src.ip),
+ ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
+ ret = set_h225_addr_hook(pskb, data, dataoff,
+ &setup->destCallSignalAddress,
+ ct->tuplehash[!dir].tuple.src.ip,
+ ntohs(ct->tuplehash[!dir].tuple.src.
+ u.tcp.port));
+ if (ret < 0)
+ return -1;
+ }
+
+ if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
+ (set_h225_addr_hook) &&
+ get_h225_addr(*data, &setup->sourceCallSignalAddress, &ip, &port)
+ && ip != ct->tuplehash[!dir].tuple.dst.ip) {
+ DEBUGP("ip_ct_q931: set sourceCallSignalAddress "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(ip), port,
+ NIPQUAD(ct->tuplehash[!dir].tuple.dst.ip),
+ ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
+ ret = set_h225_addr_hook(pskb, data, dataoff,
+ &setup->sourceCallSignalAddress,
+ ct->tuplehash[!dir].tuple.dst.ip,
+ ntohs(ct->tuplehash[!dir].tuple.dst.
+ u.tcp.port));
+ if (ret < 0)
+ return -1;
+ }
+
+ if (setup->options & eSetup_UUIE_fastStart) {
+ for (i = 0; i < setup->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &setup->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_callproceeding(struct sk_buff **pskb,
+ struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ CallProceeding_UUIE * callproc)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: CallProceeding\n");
+
+ if (callproc->options & eCallProceeding_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &callproc->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (callproc->options & eCallProceeding_UUIE_fastStart) {
+ for (i = 0; i < callproc->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &callproc->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_connect(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Connect_UUIE * connect)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: Connect\n");
+
+ if (connect->options & eConnect_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &connect->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (connect->options & eConnect_UUIE_fastStart) {
+ for (i = 0; i < connect->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &connect->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_alerting(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Alerting_UUIE * alert)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: Alerting\n");
+
+ if (alert->options & eAlerting_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &alert->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (alert->options & eAlerting_UUIE_fastStart) {
+ for (i = 0; i < alert->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &alert->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_information(struct sk_buff **pskb,
+ struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Information_UUIE * info)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: Information\n");
+
+ if (info->options & eInformation_UUIE_fastStart) {
+ for (i = 0; i < info->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &info->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_facility(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Facility_UUIE * facility)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: Facility\n");
+
+ if (facility->options & eFacility_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &facility->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (facility->options & eFacility_UUIE_fastStart) {
+ for (i = 0; i < facility->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &facility->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_progress(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff,
+ Progress_UUIE * progress)
+{
+ int ret;
+ int i;
+
+ DEBUGP("ip_ct_q931: Progress\n");
+
+ if (progress->options & eProgress_UUIE_h245Address) {
+ ret = expect_h245(pskb, ct, ctinfo, data, dataoff,
+ &progress->h245Address);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (progress->options & eProgress_UUIE_fastStart) {
+ for (i = 0; i < progress->fastStart.count; i++) {
+ ret = process_olc(pskb, ct, ctinfo, data, dataoff,
+ &progress->fastStart.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, int dataoff, Q931 * q931)
+{
+ H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
+ int i;
+ int ret = 0;
+
+ switch (pdu->h323_message_body.choice) {
+ case eH323_UU_PDU_h323_message_body_setup:
+ ret = process_setup(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.setup);
+ break;
+ case eH323_UU_PDU_h323_message_body_callProceeding:
+ ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.
+ callProceeding);
+ break;
+ case eH323_UU_PDU_h323_message_body_connect:
+ ret = process_connect(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.connect);
+ break;
+ case eH323_UU_PDU_h323_message_body_alerting:
+ ret = process_alerting(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.alerting);
+ break;
+ case eH323_UU_PDU_h323_message_body_information:
+ ret = process_information(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.
+ information);
+ break;
+ case eH323_UU_PDU_h323_message_body_facility:
+ ret = process_facility(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.facility);
+ break;
+ case eH323_UU_PDU_h323_message_body_progress:
+ ret = process_progress(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h323_message_body.progress);
+ break;
+ default:
+ DEBUGP("ip_ct_q931: Q.931 signal %d\n",
+ pdu->h323_message_body.choice);
+ break;
+ }
+
+ if (ret < 0)
+ return -1;
+
+ if (pdu->options & eH323_UU_PDU_h245Control) {
+ for (i = 0; i < pdu->h245Control.count; i++) {
+ ret = process_h245(pskb, ct, ctinfo, data, dataoff,
+ &pdu->h245Control.item[i]);
+ if (ret < 0)
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int q931_help(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ static Q931 q931;
+ unsigned char *data = NULL;
+ int datalen;
+ int dataoff;
+ int ret;
+
+ /* Until there's been traffic both ways, don't look in packets. */
+ if (ctinfo != IP_CT_ESTABLISHED
+ && ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) {
+ return NF_ACCEPT;
+ }
+ DEBUGP("ip_ct_q931: skblen = %u\n", (*pskb)->len);
+
+ spin_lock_bh(&ip_h323_lock);
+
+ /* Process each TPKT */
+ while (get_tpkt_data(pskb, ct, ctinfo, &data, &datalen, &dataoff)) {
+ DEBUGP("ip_ct_q931: TPKT %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
+ NIPQUAD((*pskb)->nh.iph->saddr),
+ NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+
+ /* Decode Q.931 signal */
+ ret = DecodeQ931(data, datalen, &q931);
+ if (ret < 0) {
+ if (net_ratelimit())
+ printk("ip_ct_q931: decoding error: %s\n",
+ ret == H323_ERROR_BOUND ?
+ "out of bound" : "out of range");
+ /* We don't drop when decoding error */
+ break;
+ }
+
+ /* Process Q.931 signal */
+ if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0)
+ goto drop;
+ }
+
+ spin_unlock_bh(&ip_h323_lock);
+ return NF_ACCEPT;
+
+ drop:
+ spin_unlock_bh(&ip_h323_lock);
+ if (net_ratelimit())
+ printk("ip_ct_q931: packet dropped\n");
+ return NF_DROP;
+}
+
+/****************************************************************************/
+static struct ip_conntrack_helper ip_conntrack_helper_q931 = {
+ .name = "Q.931",
+ .me = THIS_MODULE,
+ .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4 /* T.120 and H.245 */ ,
+ .timeout = 240,
+ .tuple = {.src = {.u = {__constant_htons(Q931_PORT)}},
+ .dst = {.protonum = IPPROTO_TCP}},
+ .mask = {.src = {.u = {0xFFFF}},
+ .dst = {.protonum = 0xFF}},
+ .help = q931_help
+};
+
+/****************************************************************************/
+void ip_conntrack_q931_expect(struct ip_conntrack *new,
+ struct ip_conntrack_expect *this)
+{
+ write_lock_bh(&ip_conntrack_lock);
+ new->helper = &ip_conntrack_helper_q931;
+ write_unlock_bh(&ip_conntrack_lock);
+}
+
+/****************************************************************************/
+static unsigned char *get_udp_data(struct sk_buff **pskb, int *datalen)
+{
+ struct udphdr _uh, *uh;
+ int dataoff;
+
+ uh = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl * 4, sizeof(_uh),
+ &_uh);
+ if (uh == NULL)
+ return NULL;
+ dataoff = (*pskb)->nh.iph->ihl * 4 + sizeof(_uh);
+ if (dataoff >= (*pskb)->len)
+ return NULL;
+ *datalen = (*pskb)->len - dataoff;
+ return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
+}
+
+/****************************************************************************/
+static struct ip_conntrack_expect *find_expect(struct ip_conntrack *ct,
+ u_int32_t ip, u_int16_t port)
+{
+ struct ip_conntrack_expect *exp;
+ struct ip_conntrack_tuple tuple;
+
+ tuple.src.ip = 0;
+ tuple.src.u.tcp.port = 0;
+ tuple.dst.ip = ip;
+ tuple.dst.u.tcp.port = htons(port);
+ tuple.dst.protonum = IPPROTO_TCP;
+
+ exp = __ip_conntrack_expect_find(&tuple);
+ if (exp->master == ct)
+ return exp;
+ return NULL;
+}
+
+/****************************************************************************/
+static int set_expect_timeout(struct ip_conntrack_expect *exp,
+ unsigned timeout)
+{
+ if (!exp || !del_timer(&exp->timeout))
+ return 0;
+
+ exp->timeout.expires = jiffies + timeout * HZ;
+ add_timer(&exp->timeout);
+
+ return 1;
+}
+
+/****************************************************************************/
+static int expect_q931(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data,
+ TransportAddress * addr, int count)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ int i;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp;
+
+ /* Look for the first related address */
+ for (i = 0; i < count; i++) {
+ if (get_h225_addr(*data, &addr[i], &ip, &port) &&
+ ip == ct->tuplehash[dir].tuple.src.ip && port != 0)
+ break;
+ }
+
+ if (i >= count) /* Not found */
+ return 0;
+
+ /* Create expect for Q.931 */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = gkrouted_only ? /* only accept calls from GK? */
+ ct->tuplehash[!dir].tuple.src.ip : 0;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ct->tuplehash[!dir].tuple.dst.ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_TCP;
+ exp->mask.src.ip = gkrouted_only ? 0xFFFFFFFF : 0;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = IP_CT_EXPECT_PERMANENT; /* Accept multiple calls */
+
+ if (nat_q931_hook) { /* Need NAT */
+ ret = nat_q931_hook(pskb, ct, ctinfo, data, addr, i,
+ port, exp);
+ } else { /* Conntrack only */
+ exp->expectfn = ip_conntrack_q931_expect;
+
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_ras: expect Q.931 "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+
+ /* Save port for looking up expect in processing RCF */
+ info->sig_port[dir] = port;
+ } else
+ ret = -1;
+ }
+
+ ip_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_grq(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, GatekeeperRequest * grq)
+{
+ DEBUGP("ip_ct_ras: GRQ\n");
+
+ if (set_ras_addr_hook) /* NATed */
+ return set_ras_addr_hook(pskb, ct, ctinfo, data,
+ &grq->rasAddress, 1);
+ return 0;
+}
+
+/* Declare before using */
+static void ip_conntrack_ras_expect(struct ip_conntrack *new,
+ struct ip_conntrack_expect *this);
+
+/****************************************************************************/
+static int process_gcf(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, GatekeeperConfirm * gcf)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp;
+
+ DEBUGP("ip_ct_ras: GCF\n");
+
+ if (!get_h225_addr(*data, &gcf->rasAddress, &ip, &port))
+ return 0;
+
+ /* Registration port is the same as discovery port */
+ if (ip == ct->tuplehash[dir].tuple.src.ip &&
+ port == ntohs(ct->tuplehash[dir].tuple.src.u.udp.port))
+ return 0;
+
+ /* Avoid RAS expectation loops. A GCF is never expected. */
+ if (test_bit(IPS_EXPECTED_BIT, &ct->status))
+ return 0;
+
+ /* Need new expect */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_UDP;
+ exp->mask.src.ip = 0xFFFFFFFF;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = 0;
+ exp->expectfn = ip_conntrack_ras_expect;
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_ras: expect RAS "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+ } else
+ ret = -1;
+
+ ip_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_rrq(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, RegistrationRequest * rrq)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int ret;
+
+ DEBUGP("ip_ct_ras: RRQ\n");
+
+ ret = expect_q931(pskb, ct, ctinfo, data,
+ rrq->callSignalAddress.item,
+ rrq->callSignalAddress.count);
+ if (ret < 0)
+ return -1;
+
+ if (set_ras_addr_hook) {
+ ret = set_ras_addr_hook(pskb, ct, ctinfo, data,
+ rrq->rasAddress.item,
+ rrq->rasAddress.count);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (rrq->options & eRegistrationRequest_timeToLive) {
+ DEBUGP("ip_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
+ info->timeout = rrq->timeToLive;
+ } else
+ info->timeout = default_rrq_ttl;
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_rcf(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, RegistrationConfirm * rcf)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int dir = CTINFO2DIR(ctinfo);
+ int ret;
+ struct ip_conntrack_expect *exp;
+
+ DEBUGP("ip_ct_ras: RCF\n");
+
+ if (set_sig_addr_hook) {
+ ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
+ rcf->callSignalAddress.item,
+ rcf->callSignalAddress.count);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (rcf->options & eRegistrationConfirm_timeToLive) {
+ DEBUGP("ip_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
+ info->timeout = rcf->timeToLive;
+ }
+
+ if (info->timeout > 0) {
+ DEBUGP
+ ("ip_ct_ras: set RAS connection timeout to %u seconds\n",
+ info->timeout);
+ ip_ct_refresh_acct(ct, ctinfo, NULL, info->timeout * HZ);
+
+ /* Set expect timeout */
+ read_lock_bh(&ip_conntrack_lock);
+ exp = find_expect(ct, ct->tuplehash[dir].tuple.dst.ip,
+ info->sig_port[!dir]);
+ if (exp) {
+ DEBUGP("ip_ct_ras: set Q.931 expect "
+ "(%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu) "
+ "timeout to %u seconds\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port),
+ info->timeout);
+ set_expect_timeout(exp, info->timeout);
+ }
+ read_unlock_bh(&ip_conntrack_lock);
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_urq(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, UnregistrationRequest * urq)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int dir = CTINFO2DIR(ctinfo);
+ int ret;
+
+ DEBUGP("ip_ct_ras: URQ\n");
+
+ if (set_sig_addr_hook) {
+ ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
+ urq->callSignalAddress.item,
+ urq->callSignalAddress.count);
+ if (ret < 0)
+ return -1;
+ }
+
+ /* Clear old expect */
+ ip_ct_remove_expectations(ct);
+ info->sig_port[dir] = 0;
+ info->sig_port[!dir] = 0;
+
+ /* Give it 30 seconds for UCF or URJ */
+ ip_ct_refresh_acct(ct, ctinfo, NULL, 30 * HZ);
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_arq(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, AdmissionRequest * arq)
+{
+ struct ip_ct_h323_master *info = &ct->help.ct_h323_info;
+ int dir = CTINFO2DIR(ctinfo);
+ u_int32_t ip;
+ u_int16_t port;
+
+ DEBUGP("ip_ct_ras: ARQ\n");
+
+ if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
+ get_h225_addr(*data, &arq->destCallSignalAddress, &ip, &port) &&
+ ip == ct->tuplehash[dir].tuple.src.ip &&
+ port == info->sig_port[dir] && set_h225_addr_hook) {
+ /* Answering ARQ */
+ return set_h225_addr_hook(pskb, data, 0,
+ &arq->destCallSignalAddress,
+ ct->tuplehash[!dir].tuple.dst.ip,
+ info->sig_port[!dir]);
+ }
+
+ if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
+ get_h225_addr(*data, &arq->srcCallSignalAddress, &ip, &port) &&
+ ip == ct->tuplehash[dir].tuple.src.ip && set_h225_addr_hook) {
+ /* Calling ARQ */
+ return set_h225_addr_hook(pskb, data, 0,
+ &arq->srcCallSignalAddress,
+ ct->tuplehash[!dir].tuple.dst.ip,
+ port);
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_acf(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, AdmissionConfirm * acf)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp;
+
+ DEBUGP("ip_ct_ras: ACF\n");
+
+ if (!get_h225_addr(*data, &acf->destCallSignalAddress, &ip, &port))
+ return 0;
+
+ if (ip == ct->tuplehash[dir].tuple.dst.ip) { /* Answering ACF */
+ if (set_sig_addr_hook)
+ return set_sig_addr_hook(pskb, ct, ctinfo, data,
+ &acf->destCallSignalAddress,
+ 1);
+ return 0;
+ }
+
+ /* Need new expect */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_TCP;
+ exp->mask.src.ip = 0xFFFFFFFF;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = IP_CT_EXPECT_PERMANENT;
+ exp->expectfn = ip_conntrack_q931_expect;
+
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_ras: expect Q.931 "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+ } else
+ ret = -1;
+
+ ip_conntrack_expect_put(exp);
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_lrq(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, LocationRequest * lrq)
+{
+ DEBUGP("ip_ct_ras: LRQ\n");
+
+ if (set_ras_addr_hook)
+ return set_ras_addr_hook(pskb, ct, ctinfo, data,
+ &lrq->replyAddress, 1);
+ return 0;
+}
+
+/****************************************************************************/
+static int process_lcf(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, LocationConfirm * lcf)
+{
+ int dir = CTINFO2DIR(ctinfo);
+ int ret = 0;
+ u_int32_t ip;
+ u_int16_t port;
+ struct ip_conntrack_expect *exp = NULL;
+
+ DEBUGP("ip_ct_ras: LCF\n");
+
+ if (!get_h225_addr(*data, &lcf->callSignalAddress, &ip, &port))
+ return 0;
+
+ /* Need new expect for call signal */
+ if ((exp = ip_conntrack_expect_alloc(ct)) == NULL)
+ return -1;
+ exp->tuple.src.ip = ct->tuplehash[!dir].tuple.src.ip;
+ exp->tuple.src.u.tcp.port = 0;
+ exp->tuple.dst.ip = ip;
+ exp->tuple.dst.u.tcp.port = htons(port);
+ exp->tuple.dst.protonum = IPPROTO_TCP;
+ exp->mask.src.ip = 0xFFFFFFFF;
+ exp->mask.src.u.tcp.port = 0;
+ exp->mask.dst.ip = 0xFFFFFFFF;
+ exp->mask.dst.u.tcp.port = 0xFFFF;
+ exp->mask.dst.protonum = 0xFF;
+ exp->flags = IP_CT_EXPECT_PERMANENT;
+ exp->expectfn = ip_conntrack_q931_expect;
+
+ if (ip_conntrack_expect_related(exp) == 0) {
+ DEBUGP("ip_ct_ras: expect Q.931 "
+ "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+ NIPQUAD(exp->tuple.src.ip),
+ ntohs(exp->tuple.src.u.tcp.port),
+ NIPQUAD(exp->tuple.dst.ip),
+ ntohs(exp->tuple.dst.u.tcp.port));
+ } else
+ ret = -1;
+
+ ip_conntrack_expect_put(exp);
+
+ /* Ignore rasAddress */
+
+ return ret;
+}
+
+/****************************************************************************/
+static int process_irr(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, InfoRequestResponse * irr)
+{
+ int ret;
+
+ DEBUGP("ip_ct_ras: IRR\n");
+
+ if (set_ras_addr_hook) {
+ ret = set_ras_addr_hook(pskb, ct, ctinfo, data,
+ &irr->rasAddress, 1);
+ if (ret < 0)
+ return -1;
+ }
+
+ if (set_sig_addr_hook) {
+ ret = set_sig_addr_hook(pskb, ct, ctinfo, data,
+ irr->callSignalAddress.item,
+ irr->callSignalAddress.count);
+ if (ret < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int process_ras(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo,
+ unsigned char **data, RasMessage * ras)
+{
+ switch (ras->choice) {
+ case eRasMessage_gatekeeperRequest:
+ return process_grq(pskb, ct, ctinfo, data,
+ &ras->gatekeeperRequest);
+ case eRasMessage_gatekeeperConfirm:
+ return process_gcf(pskb, ct, ctinfo, data,
+ &ras->gatekeeperConfirm);
+ case eRasMessage_registrationRequest:
+ return process_rrq(pskb, ct, ctinfo, data,
+ &ras->registrationRequest);
+ case eRasMessage_registrationConfirm:
+ return process_rcf(pskb, ct, ctinfo, data,
+ &ras->registrationConfirm);
+ case eRasMessage_unregistrationRequest:
+ return process_urq(pskb, ct, ctinfo, data,
+ &ras->unregistrationRequest);
+ case eRasMessage_admissionRequest:
+ return process_arq(pskb, ct, ctinfo, data,
+ &ras->admissionRequest);
+ case eRasMessage_admissionConfirm:
+ return process_acf(pskb, ct, ctinfo, data,
+ &ras->admissionConfirm);
+ case eRasMessage_locationRequest:
+ return process_lrq(pskb, ct, ctinfo, data,
+ &ras->locationRequest);
+ case eRasMessage_locationConfirm:
+ return process_lcf(pskb, ct, ctinfo, data,
+ &ras->locationConfirm);
+ case eRasMessage_infoRequestResponse:
+ return process_irr(pskb, ct, ctinfo, data,
+ &ras->infoRequestResponse);
+ default:
+ DEBUGP("ip_ct_ras: RAS message %d\n", ras->choice);
+ break;
+ }
+
+ return 0;
+}
+
+/****************************************************************************/
+static int ras_help(struct sk_buff **pskb, struct ip_conntrack *ct,
+ enum ip_conntrack_info ctinfo)
+{
+ static RasMessage ras;
+ unsigned char *data;
+ int datalen = 0;
+ int ret;
+
+ DEBUGP("ip_ct_ras: skblen = %u\n", (*pskb)->len);
+
+ spin_lock_bh(&ip_h323_lock);
+
+ /* Get UDP data */
+ data = get_udp_data(pskb, &datalen);
+ if (data == NULL)
+ goto accept;
+ DEBUGP("ip_ct_ras: RAS message %u.%u.%u.%u->%u.%u.%u.%u, len=%d\n",
+ NIPQUAD((*pskb)->nh.iph->saddr),
+ NIPQUAD((*pskb)->nh.iph->daddr), datalen);
+
+ /* Decode RAS message */
+ ret = DecodeRasMessage(data, datalen, &ras);
+ if (ret < 0) {
+ if (net_ratelimit())
+ printk("ip_ct_ras: decoding error: %s\n",
+ ret == H323_ERROR_BOUND ?
+ "out of bound" : "out of range");
+ goto accept;
+ }
+
+ /* Process RAS message */
+ if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0)
+ goto drop;
+
+ accept:
+ spin_unlock_bh(&ip_h323_lock);
+ return NF_ACCEPT;
+
+ drop:
+ spin_unlock_bh(&ip_h323_lock);
+ if (net_ratelimit())
+ printk("ip_ct_ras: packet dropped\n");
+ return NF_DROP;
+}
+
+/****************************************************************************/
+static struct ip_conntrack_helper ip_conntrack_helper_ras = {
+ .name = "RAS",
+ .me = THIS_MODULE,
+ .max_expected = 32,
+ .timeout = 240,
+ .tuple = {.src = {.u = {__constant_htons(RAS_PORT)}},
+ .dst = {.protonum = IPPROTO_UDP}},
+ .mask = {.src = {.u = {0xFFFE}},
+ .dst = {.protonum = 0xFF}},
+ .help = ras_help,
+};
+
+/****************************************************************************/
+static void ip_conntrack_ras_expect(struct ip_conntrack *new,
+ struct ip_conntrack_expect *this)
+{
+ write_lock_bh(&ip_conntrack_lock);
+ new->helper = &ip_conntrack_helper_ras;
+ write_unlock_bh(&ip_conntrack_lock);
+}
+
+/****************************************************************************/
+/* Not __exit - called from init() */
+static void fini(void)
+{
+ ip_conntrack_helper_unregister(&ip_conntrack_helper_ras);
+ ip_conntrack_helper_unregister(&ip_conntrack_helper_q931);
+ kfree(h323_buffer);
+ DEBUGP("ip_ct_h323: fini\n");
+}
+
+/****************************************************************************/
+static int __init init(void)
+{
+ int ret;
+
+ h323_buffer = kmalloc(65536, GFP_KERNEL);
+ if (!h323_buffer)
+ return -ENOMEM;
+ if ((ret = ip_conntrack_helper_register(&ip_conntrack_helper_q931)) ||
+ (ret = ip_conntrack_helper_register(&ip_conntrack_helper_ras))) {
+ fini();
+ return ret;
+ }
+
+ DEBUGP("ip_ct_h323: init success\n");
+ return 0;
+}
+
+/****************************************************************************/
+module_init(init);
+module_exit(fini);
+
+EXPORT_SYMBOL_GPL(get_h225_addr);
+EXPORT_SYMBOL_GPL(ip_conntrack_h245_expect);
+EXPORT_SYMBOL_GPL(ip_conntrack_q931_expect);
+EXPORT_SYMBOL_GPL(set_h245_addr_hook);
+EXPORT_SYMBOL_GPL(set_h225_addr_hook);
+EXPORT_SYMBOL_GPL(set_sig_addr_hook);
+EXPORT_SYMBOL_GPL(set_ras_addr_hook);
+EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
+EXPORT_SYMBOL_GPL(nat_t120_hook);
+EXPORT_SYMBOL_GPL(nat_h245_hook);
+EXPORT_SYMBOL_GPL(nat_q931_hook);
+
+MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
+MODULE_DESCRIPTION("H.323 connection tracking helper");
+MODULE_LICENSE("GPL");
git://git.onelab.eu / linux-2.6.git / blobdiff