[NETFILTER]: nf_conntrack/nf_nat: add H.323 helper port

Add IPv4 and IPv6 capable nf_conntrack port of the H.323 conntrack/NAT helper.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

15 files changed, 2600 insertions, 14 deletions

diff --git a/include/linux/netfilter/nf_conntrack_h323.h b/include/linux/netfilter/nf_conntrack_h323.h
new file mode 100644
index 0000000..08e2f49
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_h323.h
@@ -0,0 +1,92 @@
+#ifndef _NF_CONNTRACK_H323_H
+#define _NF_CONNTRACK_H323_H
+
+#ifdef __KERNEL__
+
+#include <linux/netfilter/nf_conntrack_h323_asn1.h>
+
+#define RAS_PORT 1719
+#define Q931_PORT 1720
+#define H323_RTP_CHANNEL_MAX 4	/* Audio, video, FAX and other */
+
+/* This structure exists only once per master */
+struct nf_ct_h323_master {
+
+	/* Original and NATed Q.931 or H.245 signal ports */
+	__be16 sig_port[IP_CT_DIR_MAX];
+
+	/* Original and NATed RTP ports */
+	__be16 rtp_port[H323_RTP_CHANNEL_MAX][IP_CT_DIR_MAX];
+
+	union {
+		/* RAS connection timeout */
+		u_int32_t timeout;
+
+		/* Next TPKT length (for separate TPKT header and data) */
+		u_int16_t tpkt_len[IP_CT_DIR_MAX];
+	};
+};
+
+struct nf_conn;
+
+extern int get_h225_addr(struct nf_conn *ct, unsigned char *data,
+			 TransportAddress *taddr,
+			 union nf_conntrack_address *addr, __be16 *port);
+extern void nf_conntrack_h245_expect(struct nf_conn *new,
+				     struct nf_conntrack_expect *this);
+extern void nf_conntrack_q931_expect(struct nf_conn *new,
+				     struct nf_conntrack_expect *this);
+extern int (*set_h245_addr_hook) (struct sk_buff **pskb,
+				  unsigned char **data, int dataoff,
+				  H245_TransportAddress *taddr,
+				  union nf_conntrack_address *addr,
+				  __be16 port);
+extern int (*set_h225_addr_hook) (struct sk_buff **pskb,
+				  unsigned char **data, int dataoff,
+				  TransportAddress *taddr,
+				  union nf_conntrack_address *addr,
+				  __be16 port);
+extern int (*set_sig_addr_hook) (struct sk_buff **pskb,
+				 struct nf_conn *ct,
+				 enum ip_conntrack_info ctinfo,
+				 unsigned char **data,
+				 TransportAddress *taddr, int count);
+extern int (*set_ras_addr_hook) (struct sk_buff **pskb,
+				 struct nf_conn *ct,
+				 enum ip_conntrack_info ctinfo,
+				 unsigned char **data,
+				 TransportAddress *taddr, int count);
+extern int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb,
+				 struct nf_conn *ct,
+				 enum ip_conntrack_info ctinfo,
+				 unsigned char **data, int dataoff,
+				 H245_TransportAddress *taddr,
+				 __be16 port, __be16 rtp_port,
+				 struct nf_conntrack_expect *rtp_exp,
+				 struct nf_conntrack_expect *rtcp_exp);
+extern int (*nat_t120_hook) (struct sk_buff **pskb, struct nf_conn *ct,
+			     enum ip_conntrack_info ctinfo,
+			     unsigned char **data, int dataoff,
+			     H245_TransportAddress *taddr, __be16 port,
+			     struct nf_conntrack_expect *exp);
+extern int (*nat_h245_hook) (struct sk_buff **pskb, struct nf_conn *ct,
+			     enum ip_conntrack_info ctinfo,
+			     unsigned char **data, int dataoff,
+			     TransportAddress *taddr, __be16 port,
+			     struct nf_conntrack_expect *exp);
+extern int (*nat_callforwarding_hook) (struct sk_buff **pskb,
+				       struct nf_conn *ct,
+				       enum ip_conntrack_info ctinfo,
+				       unsigned char **data, int dataoff,
+				       TransportAddress *taddr,
+				       __be16 port,
+				       struct nf_conntrack_expect *exp);
+extern int (*nat_q931_hook) (struct sk_buff **pskb, struct nf_conn *ct,
+			     enum ip_conntrack_info ctinfo,
+			     unsigned char **data, TransportAddress *taddr,
+			     int idx, __be16 port,
+			     struct nf_conntrack_expect *exp);
+
+#endif
+
+#endif
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h b/include/linux/netfilter/nf_conntrack_h323_asn1.h
index c6e9a0b..8dab596 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h
+++ b/include/linux/netfilter/nf_conntrack_h323_asn1.h
@@ -1,6 +1,6 @@
 /****************************************************************************
- * ip_conntrack_helper_h323_asn1.h - BER and PER decoding library for H.323
- * 			      	     conntrack/NAT module.
+ * ip_conntrack_h323_asn1.h - BER and PER decoding library for H.323
+ * 			      conntrack/NAT module.
  *
  * Copyright (c) 2006 by Jing Min Zhao <zhaojingmin@users.sourceforge.net>
  *
@@ -34,13 +34,13 @@
  *
  ****************************************************************************/
 
-#ifndef _IP_CONNTRACK_HELPER_H323_ASN1_H_
-#define _IP_CONNTRACK_HELPER_H323_ASN1_H_
+#ifndef _NF_CONNTRACK_HELPER_H323_ASN1_H_
+#define _NF_CONNTRACK_HELPER_H323_ASN1_H_
 
 /*****************************************************************************
  * H.323 Types
  ****************************************************************************/
-#include "ip_conntrack_helper_h323_types.h"
+#include "nf_conntrack_h323_types.h"
 
 typedef struct {
 	enum {
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_helper_h323_types.h b/include/linux/netfilter/nf_conntrack_h323_types.h
index 3d4a773..38d74d5 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_helper_h323_types.h
+++ b/include/linux/netfilter/nf_conntrack_h323_types.h
@@ -10,6 +10,11 @@ typedef struct TransportAddress_ipAddress {	/* SEQUENCE */
 	unsigned ip;
 } TransportAddress_ipAddress;
 
+typedef struct TransportAddress_ip6Address {	/* SEQUENCE */
+	int options;		/* No use */
+	unsigned ip6;
+} TransportAddress_ip6Address;
+
 typedef struct TransportAddress {	/* CHOICE */
 	enum {
 		eTransportAddress_ipAddress,
@@ -22,6 +27,7 @@ typedef struct TransportAddress {	/* CHOICE */
 	} choice;
 	union {
 		TransportAddress_ipAddress ipAddress;
+		TransportAddress_ip6Address ip6Address;
 	};
 } TransportAddress;
 
@@ -93,6 +99,11 @@ typedef struct UnicastAddress_iPAddress {	/* SEQUENCE */
 	unsigned network;
 } UnicastAddress_iPAddress;
 
+typedef struct UnicastAddress_iP6Address {	/* SEQUENCE */
+	int options;		/* No use */
+	unsigned network;
+} UnicastAddress_iP6Address;
+
 typedef struct UnicastAddress {	/* CHOICE */
 	enum {
 		eUnicastAddress_iPAddress,
@@ -105,6 +116,7 @@ typedef struct UnicastAddress {	/* CHOICE */
 	} choice;
 	union {
 		UnicastAddress_iPAddress iPAddress;
+		UnicastAddress_iP6Address iP6Address;
 	};
 } UnicastAddress;
 
diff --git a/include/linux/netfilter_ipv4/Kbuild b/include/linux/netfilter_ipv4/Kbuild
index 591c1a8..1803378 100644
--- a/include/linux/netfilter_ipv4/Kbuild
+++ b/include/linux/netfilter_ipv4/Kbuild
@@ -1,6 +1,4 @@
 header-y += ip_conntrack_helper.h
-header-y += ip_conntrack_helper_h323_asn1.h
-header-y += ip_conntrack_helper_h323_types.h
 header-y += ip_conntrack_protocol.h
 header-y += ip_conntrack_sctp.h
 header-y += ip_conntrack_tcp.h
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_h323.h b/include/linux/netfilter_ipv4/ip_conntrack_h323.h
index 943cc6a..18f7698 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_h323.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack_h323.h
@@ -3,7 +3,7 @@
 
 #ifdef __KERNEL__
 
-#include <linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h>
+#include <linux/netfilter/nf_conntrack_h323_asn1.h>
 
 #define RAS_PORT 1719
 #define Q931_PORT 1720
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index 83694cf..1646076 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -41,11 +41,13 @@ union nf_conntrack_expect_proto {
 
 /* Add protocol helper include file here */
 #include <linux/netfilter/nf_conntrack_ftp.h>
+#include <linux/netfilter/nf_conntrack_h323.h>
 
 /* per conntrack: application helper private data */
 union nf_conntrack_help {
 	/* insert conntrack helper private data (master) here */
 	struct nf_ct_ftp_master ct_ftp_info;
+	struct nf_ct_h323_master ct_h323_info;
 };
 
 #include <linux/types.h>
diff --git a/include/net/netfilter/nf_conntrack_expect.h b/include/net/netfilter/nf_conntrack_expect.h
index 54a3d03..cef3136 100644
--- a/include/net/netfilter/nf_conntrack_expect.h
+++ b/include/net/netfilter/nf_conntrack_expect.h
@@ -41,6 +41,7 @@ struct nf_conntrack_expect
 	unsigned int flags;
 
 #ifdef CONFIG_NF_NAT_NEEDED
+	__be32 saved_ip;
 	/* This is the original per-proto part, used to map the
 	 * expected connection the way the recipient expects. */
 	union nf_conntrack_man_proto saved_proto;
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 6993ec5..e14156d 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -529,6 +529,11 @@ config IP_NF_NAT_H323
 	default IP_NF_NAT if IP_NF_H323=y
 	default m if IP_NF_H323=m
 
+config NF_NAT_H323
+	tristate
+	depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
+	default NF_NAT && NF_CONNTRACK_H323
+
 config IP_NF_NAT_SIP
 	tristate
 	depends on IP_NF_IPTABLES!=n && IP_NF_CONNTRACK!=n && IP_NF_NAT!=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 8893249b..bdaba47 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -15,7 +15,7 @@ endif
 ip_conntrack_pptp-objs	:= ip_conntrack_helper_pptp.o ip_conntrack_proto_gre.o
 ip_nat_pptp-objs	:= ip_nat_helper_pptp.o ip_nat_proto_gre.o
 
-ip_conntrack_h323-objs := ip_conntrack_helper_h323.o ip_conntrack_helper_h323_asn1.o
+ip_conntrack_h323-objs := ip_conntrack_helper_h323.o ../../netfilter/nf_conntrack_h323_asn1.o
 ip_nat_h323-objs := ip_nat_helper_h323.o
 
 # connection tracking
@@ -52,6 +52,7 @@ obj-$(CONFIG_IP_NF_NAT_SIP) += ip_nat_sip.o
 # NAT helpers (nf_conntrack)
 obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
 obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
+obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
 
 # generic IP tables 
 obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c
new file mode 100644
index 0000000..fb9ab01
--- /dev/null
+++ b/net/ipv4/netfilter/nf_nat_h323.c
@@ -0,0 +1,596 @@
+/*
+ * H.323 extension for NAT alteration.
+ *
+ * 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 NAT module by
+ * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/tcp.h>
+#include <net/tcp.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_helper.h>
+#include <net/netfilter/nf_nat_rule.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <linux/netfilter/nf_conntrack_h323.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/****************************************************************************/
+static int set_addr(struct sk_buff **pskb,
+		    unsigned char **data, int dataoff,
+		    unsigned int addroff, __be32 ip, __be16 port)
+{
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct = ip_conntrack_get(*pskb, &ctinfo);
+	struct {
+		__be32 ip;
+		__be16 port;
+	} __attribute__ ((__packed__)) buf;
+	struct tcphdr _tcph, *th;
+
+	buf.ip = ip;
+	buf.port = port;
+	addroff += dataoff;
+
+	if ((*pskb)->nh.iph->protocol == IPPROTO_TCP) {
+		if (!nf_nat_mangle_tcp_packet(pskb, ct, ctinfo,
+					      addroff, sizeof(buf),
+					      (char *) &buf, sizeof(buf))) {
+			if (net_ratelimit())
+				printk("nf_nat_h323: nf_nat_mangle_tcp_packet"
+				       " error\n");
+			return -1;
+		}
+
+		/* Relocate data pointer */
+		th = skb_header_pointer(*pskb, (*pskb)->nh.iph->ihl * 4,
+					sizeof(_tcph), &_tcph);
+		if (th == NULL)
+			return -1;
+		*data = (*pskb)->data + (*pskb)->nh.iph->ihl * 4 +
+		    th->doff * 4 + dataoff;
+	} else {
+		if (!nf_nat_mangle_udp_packet(pskb, ct, ctinfo,
+					      addroff, sizeof(buf),
+					      (char *) &buf, sizeof(buf))) {
+			if (net_ratelimit())
+				printk("nf_nat_h323: nf_nat_mangle_udp_packet"
+				       " error\n");
+			return -1;
+		}
+		/* nf_nat_mangle_udp_packet uses skb_make_writable() to copy
+		 * or pull everything in a linear buffer, so we can safely
+		 * use the skb pointers now */
+		*data = (*pskb)->data + (*pskb)->nh.iph->ihl * 4 +
+		    sizeof(struct udphdr);
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int set_h225_addr(struct sk_buff **pskb,
+			 unsigned char **data, int dataoff,
+			 TransportAddress *taddr,
+			 union nf_conntrack_address *addr, __be16 port)
+{
+	return set_addr(pskb, data, dataoff, taddr->ipAddress.ip,
+			addr->ip, port);
+}
+
+/****************************************************************************/
+static int set_h245_addr(struct sk_buff **pskb,
+			 unsigned char **data, int dataoff,
+			 H245_TransportAddress *taddr,
+			 union nf_conntrack_address *addr, __be16 port)
+{
+	return set_addr(pskb, data, dataoff,
+			taddr->unicastAddress.iPAddress.network,
+			addr->ip, port);
+}
+
+/****************************************************************************/
+static int set_sig_addr(struct sk_buff **pskb, struct nf_conn *ct,
+			enum ip_conntrack_info ctinfo,
+			unsigned char **data,
+			TransportAddress *taddr, int count)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	int i;
+	__be16 port;
+	union nf_conntrack_address addr;
+
+	for (i = 0; i < count; i++) {
+		if (get_h225_addr(ct, *data, &taddr[i], &addr, &port)) {
+			if (addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
+			    port == info->sig_port[dir]) {
+				/* GW->GK */
+
+				/* Fix for Gnomemeeting */
+				if (i > 0 &&
+				    get_h225_addr(ct, *data, &taddr[0],
+						  &addr, &port) &&
+				    (ntohl(addr.ip) & 0xff000000) == 0x7f000000)
+					i = 0;
+
+				DEBUGP
+				    ("nf_nat_ras: set signal address "
+				     "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+				     NIPQUAD(ip), port,
+				     NIPQUAD(ct->tuplehash[!dir].tuple.dst.
+					     ip), info->sig_port[!dir]);
+				return set_h225_addr(pskb, data, 0, &taddr[i],
+						     &ct->tuplehash[!dir].
+						     tuple.dst.u3,
+						     info->sig_port[!dir]);
+			} else if (addr.ip == ct->tuplehash[dir].tuple.dst.u3.ip &&
+				   port == info->sig_port[dir]) {
+				/* GK->GW */
+				DEBUGP
+				    ("nf_nat_ras: set signal address "
+				     "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+				     NIPQUAD(ip), port,
+				     NIPQUAD(ct->tuplehash[!dir].tuple.src.
+					     ip), info->sig_port[!dir]);
+				return set_h225_addr(pskb, data, 0, &taddr[i],
+						     &ct->tuplehash[!dir].
+						     tuple.src.u3,
+						     info->sig_port[!dir]);
+			}
+		}
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int set_ras_addr(struct sk_buff **pskb, struct nf_conn *ct,
+			enum ip_conntrack_info ctinfo,
+			unsigned char **data,
+			TransportAddress *taddr, int count)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int i;
+	__be16 port;
+	union nf_conntrack_address addr;
+
+	for (i = 0; i < count; i++) {
+		if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
+		    addr.ip == ct->tuplehash[dir].tuple.src.u3.ip &&
+		    port == ct->tuplehash[dir].tuple.src.u.udp.port) {
+			DEBUGP("nf_nat_ras: set rasAddress "
+			       "%u.%u.%u.%u:%hu->%u.%u.%u.%u:%hu\n",
+			       NIPQUAD(ip), ntohs(port),
+			       NIPQUAD(ct->tuplehash[!dir].tuple.dst.u3.ip),
+			       ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.
+				     port));
+			return set_h225_addr(pskb, data, 0, &taddr[i],
+					     &ct->tuplehash[!dir].tuple.dst.u3,
+					     ct->tuplehash[!dir].tuple.
+								dst.u.udp.port);
+		}
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int nat_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
+			enum ip_conntrack_info ctinfo,
+			unsigned char **data, int dataoff,
+			H245_TransportAddress *taddr,
+			__be16 port, __be16 rtp_port,
+			struct nf_conntrack_expect *rtp_exp,
+			struct nf_conntrack_expect *rtcp_exp)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	int i;
+	u_int16_t nated_port;
+
+	/* Set expectations for NAT */
+	rtp_exp->saved_proto.udp.port = rtp_exp->tuple.dst.u.udp.port;
+	rtp_exp->expectfn = nf_nat_follow_master;
+	rtp_exp->dir = !dir;
+	rtcp_exp->saved_proto.udp.port = rtcp_exp->tuple.dst.u.udp.port;
+	rtcp_exp->expectfn = nf_nat_follow_master;
+	rtcp_exp->dir = !dir;
+
+	/* Lookup existing expects */
+	for (i = 0; i < H323_RTP_CHANNEL_MAX; i++) {
+		if (info->rtp_port[i][dir] == rtp_port) {
+			/* Expected */
+
+			/* Use allocated ports first. This will refresh
+			 * the expects */
+			rtp_exp->tuple.dst.u.udp.port = info->rtp_port[i][dir];
+			rtcp_exp->tuple.dst.u.udp.port =
+			    htons(ntohs(info->rtp_port[i][dir]) + 1);
+			break;
+		} else if (info->rtp_port[i][dir] == 0) {
+			/* Not expected */
+			break;
+		}
+	}
+
+	/* Run out of expectations */
+	if (i >= H323_RTP_CHANNEL_MAX) {
+		if (net_ratelimit())
+			printk("nf_nat_h323: out of expectations\n");
+		return 0;
+	}
+
+	/* Try to get a pair of ports. */
+	for (nated_port = ntohs(rtp_exp->tuple.dst.u.udp.port);
+	     nated_port != 0; nated_port += 2) {
+		rtp_exp->tuple.dst.u.udp.port = htons(nated_port);
+		if (nf_conntrack_expect_related(rtp_exp) == 0) {
+			rtcp_exp->tuple.dst.u.udp.port =
+			    htons(nated_port + 1);
+			if (nf_conntrack_expect_related(rtcp_exp) == 0)
+				break;
+			nf_conntrack_unexpect_related(rtp_exp);
+		}
+	}
+
+	if (nated_port == 0) {	/* No port available */
+		if (net_ratelimit())
+			printk("nf_nat_h323: out of RTP ports\n");
+		return 0;
+	}
+
+	/* Modify signal */
+	if (set_h245_addr(pskb, data, dataoff, taddr,
+			  &ct->tuplehash[!dir].tuple.dst.u3,
+			  htons((port & htons(1)) ? nated_port + 1 :
+			  			    nated_port)) == 0) {
+		/* Save ports */
+		info->rtp_port[i][dir] = rtp_port;
+		info->rtp_port[i][!dir] = htons(nated_port);
+	} else {
+		nf_conntrack_unexpect_related(rtp_exp);
+		nf_conntrack_unexpect_related(rtcp_exp);
+		return -1;
+	}
+
+	/* Success */
+	DEBUGP("nf_nat_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("nf_nat_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));
+
+	return 0;
+}
+
+/****************************************************************************/
+static int nat_t120(struct sk_buff **pskb, struct nf_conn *ct,
+		    enum ip_conntrack_info ctinfo,
+		    unsigned char **data, int dataoff,
+		    H245_TransportAddress *taddr, __be16 port,
+		    struct nf_conntrack_expect *exp)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	u_int16_t nated_port = ntohs(port);
+
+	/* Set expectations for NAT */
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->expectfn = nf_nat_follow_master;
+	exp->dir = !dir;
+
+	/* Try to get same port: if not, try to change it. */
+	for (; nated_port != 0; nated_port++) {
+		exp->tuple.dst.u.tcp.port = htons(nated_port);
+		if (nf_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (nated_port == 0) {	/* No port available */
+		if (net_ratelimit())
+			printk("nf_nat_h323: out of TCP ports\n");
+		return 0;
+	}
+
+	/* Modify signal */
+	if (set_h245_addr(pskb, data, dataoff, taddr,
+			  &ct->tuplehash[!dir].tuple.dst.u3,
+			  htons(nated_port)) < 0) {
+		nf_conntrack_unexpect_related(exp);
+		return -1;
+	}
+
+	DEBUGP("nf_nat_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));
+
+	return 0;
+}
+
+/****************************************************************************/
+static int nat_h245(struct sk_buff **pskb, struct nf_conn *ct,
+		    enum ip_conntrack_info ctinfo,
+		    unsigned char **data, int dataoff,
+		    TransportAddress *taddr, __be16 port,
+		    struct nf_conntrack_expect *exp)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	u_int16_t nated_port = ntohs(port);
+
+	/* Set expectations for NAT */
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->expectfn = nf_nat_follow_master;
+	exp->dir = !dir;
+
+	/* Check existing expects */
+	if (info->sig_port[dir] == port)
+		nated_port = ntohs(info->sig_port[!dir]);
+
+	/* Try to get same port: if not, try to change it. */
+	for (; nated_port != 0; nated_port++) {
+		exp->tuple.dst.u.tcp.port = htons(nated_port);
+		if (nf_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (nated_port == 0) {	/* No port available */
+		if (net_ratelimit())
+			printk("nf_nat_q931: out of TCP ports\n");
+		return 0;
+	}
+
+	/* Modify signal */
+	if (set_h225_addr(pskb, data, dataoff, taddr,
+			  &ct->tuplehash[!dir].tuple.dst.u3,
+			  htons(nated_port)) == 0) {
+		/* Save ports */
+		info->sig_port[dir] = port;
+		info->sig_port[!dir] = htons(nated_port);
+	} else {
+		nf_conntrack_unexpect_related(exp);
+		return -1;
+	}
+
+	DEBUGP("nf_nat_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));
+
+	return 0;
+}
+
+/****************************************************************************
+ * This conntrack expect function replaces nf_conntrack_q931_expect()
+ * which was set by nf_conntrack_h323.c.
+ ****************************************************************************/
+static void ip_nat_q931_expect(struct nf_conn *new,
+			       struct nf_conntrack_expect *this)
+{
+	struct ip_nat_range range;
+
+	if (this->tuple.src.u3.ip != 0) {	/* Only accept calls from GK */
+		nf_nat_follow_master(new, this);
+		return;
+	}
+
+	/* This must be a fresh one. */
+	BUG_ON(new->status & IPS_NAT_DONE_MASK);
+
+	/* Change src to where master sends to */
+	range.flags = IP_NAT_RANGE_MAP_IPS;
+	range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
+
+	/* hook doesn't matter, but it has to do source manip */
+	nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
+
+	/* For DST manip, map port here to where it's expected. */
+	range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
+	range.min = range.max = this->saved_proto;
+	range.min_ip = range.max_ip =
+	    new->master->tuplehash[!this->dir].tuple.src.u3.ip;
+
+	/* hook doesn't matter, but it has to do destination manip */
+	nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
+}
+
+/****************************************************************************/
+static int nat_q931(struct sk_buff **pskb, struct nf_conn *ct,
+		    enum ip_conntrack_info ctinfo,
+		    unsigned char **data, TransportAddress *taddr, int idx,
+		    __be16 port, struct nf_conntrack_expect *exp)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	u_int16_t nated_port = ntohs(port);
+	union nf_conntrack_address addr;
+
+	/* Set expectations for NAT */
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->expectfn = ip_nat_q931_expect;
+	exp->dir = !dir;
+
+	/* Check existing expects */
+	if (info->sig_port[dir] == port)
+		nated_port = ntohs(info->sig_port[!dir]);
+
+	/* Try to get same port: if not, try to change it. */
+	for (; nated_port != 0; nated_port++) {
+		exp->tuple.dst.u.tcp.port = htons(nated_port);
+		if (nf_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (nated_port == 0) {	/* No port available */
+		if (net_ratelimit())
+			printk("nf_nat_ras: out of TCP ports\n");
+		return 0;
+	}
+
+	/* Modify signal */
+	if (set_h225_addr(pskb, data, 0, &taddr[idx],
+			  &ct->tuplehash[!dir].tuple.dst.u3,
+			  htons(nated_port)) == 0) {
+		/* Save ports */
+		info->sig_port[dir] = port;
+		info->sig_port[!dir] = htons(nated_port);
+
+		/* Fix for Gnomemeeting */
+		if (idx > 0 &&
+		    get_h225_addr(ct, *data, &taddr[0], &addr, &port) &&
+		    (ntohl(addr.ip) & 0xff000000) == 0x7f000000) {
+			set_h225_addr_hook(pskb, data, 0, &taddr[0],
+					   &ct->tuplehash[!dir].tuple.dst.u3,
+					   info->sig_port[!dir]);
+		}
+	} else {
+		nf_conntrack_unexpect_related(exp);
+		return -1;
+	}
+
+	/* Success */
+	DEBUGP("nf_nat_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));
+
+	return 0;
+}
+
+/****************************************************************************/
+static void ip_nat_callforwarding_expect(struct nf_conn *new,
+					 struct nf_conntrack_expect *this)
+{
+	struct nf_nat_range range;
+
+	/* This must be a fresh one. */
+	BUG_ON(new->status & IPS_NAT_DONE_MASK);
+
+	/* Change src to where master sends to */
+	range.flags = IP_NAT_RANGE_MAP_IPS;
+	range.min_ip = range.max_ip = new->tuplehash[!this->dir].tuple.src.u3.ip;
+
+	/* hook doesn't matter, but it has to do source manip */
+	nf_nat_setup_info(new, &range, NF_IP_POST_ROUTING);
+
+	/* For DST manip, map port here to where it's expected. */
+	range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
+	range.min = range.max = this->saved_proto;
+	range.min_ip = range.max_ip = this->saved_ip;
+
+	/* hook doesn't matter, but it has to do destination manip */
+	nf_nat_setup_info(new, &range, NF_IP_PRE_ROUTING);
+}
+
+/****************************************************************************/
+static int nat_callforwarding(struct sk_buff **pskb, struct nf_conn *ct,
+			      enum ip_conntrack_info ctinfo,
+			      unsigned char **data, int dataoff,
+			      TransportAddress *taddr, __be16 port,
+			      struct nf_conntrack_expect *exp)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	u_int16_t nated_port;
+
+	/* Set expectations for NAT */
+	exp->saved_ip = exp->tuple.dst.u3.ip;
+	exp->tuple.dst.u3.ip = ct->tuplehash[!dir].tuple.dst.u3.ip;
+	exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
+	exp->expectfn = ip_nat_callforwarding_expect;
+	exp->dir = !dir;
+
+	/* Try to get same port: if not, try to change it. */
+	for (nated_port = ntohs(port); nated_port != 0; nated_port++) {
+		exp->tuple.dst.u.tcp.port = htons(nated_port);
+		if (nf_conntrack_expect_related(exp) == 0)
+			break;
+	}
+
+	if (nated_port == 0) {	/* No port available */
+		if (net_ratelimit())
+			printk("nf_nat_q931: out of TCP ports\n");
+		return 0;
+	}
+
+	/* Modify signal */
+	if (!set_h225_addr(pskb, data, dataoff, taddr,
+			   &ct->tuplehash[!dir].tuple.dst.u3,
+			   htons(nated_port)) == 0) {
+		nf_conntrack_unexpect_related(exp);
+		return -1;
+	}
+
+	/* Success */
+	DEBUGP("nf_nat_q931: expect Call Forwarding "
+	       "%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));
+
+	return 0;
+}
+
+/****************************************************************************/
+static int __init init(void)
+{
+	BUG_ON(rcu_dereference(set_h245_addr_hook) != NULL);
+	BUG_ON(rcu_dereference(set_h225_addr_hook) != NULL);
+	BUG_ON(rcu_dereference(set_sig_addr_hook) != NULL);
+	BUG_ON(rcu_dereference(set_ras_addr_hook) != NULL);
+	BUG_ON(rcu_dereference(nat_rtp_rtcp_hook) != NULL);
+	BUG_ON(rcu_dereference(nat_t120_hook) != NULL);
+	BUG_ON(rcu_dereference(nat_h245_hook) != NULL);
+	BUG_ON(rcu_dereference(nat_callforwarding_hook) != NULL);
+	BUG_ON(rcu_dereference(nat_q931_hook) != NULL);
+
+	rcu_assign_pointer(set_h245_addr_hook, set_h245_addr);
+	rcu_assign_pointer(set_h225_addr_hook, set_h225_addr);
+	rcu_assign_pointer(set_sig_addr_hook, set_sig_addr);
+	rcu_assign_pointer(set_ras_addr_hook, set_ras_addr);
+	rcu_assign_pointer(nat_rtp_rtcp_hook, nat_rtp_rtcp);
+	rcu_assign_pointer(nat_t120_hook, nat_t120);
+	rcu_assign_pointer(nat_h245_hook, nat_h245);
+	rcu_assign_pointer(nat_callforwarding_hook, nat_callforwarding);
+	rcu_assign_pointer(nat_q931_hook, nat_q931);
+
+	DEBUGP("nf_nat_h323: init success\n");
+	return 0;
+}
+
+/****************************************************************************/
+static void __exit fini(void)
+{
+	rcu_assign_pointer(set_h245_addr_hook, NULL);
+	rcu_assign_pointer(set_h225_addr_hook, NULL);
+	rcu_assign_pointer(set_sig_addr_hook, NULL);
+	rcu_assign_pointer(set_ras_addr_hook, NULL);
+	rcu_assign_pointer(nat_rtp_rtcp_hook, NULL);
+	rcu_assign_pointer(nat_t120_hook, NULL);
+	rcu_assign_pointer(nat_h245_hook, NULL);
+	rcu_assign_pointer(nat_callforwarding_hook, NULL);
+	rcu_assign_pointer(nat_q931_hook, NULL);
+	synchronize_rcu();
+}
+
+/****************************************************************************/
+module_init(init);
+module_exit(fini);
+
+MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
+MODULE_DESCRIPTION("H.323 NAT helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_nat_h323");
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f85fd43..d8f3451 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -160,6 +160,25 @@ config NF_CONNTRACK_FTP
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NF_CONNTRACK_H323
+	tristate "H.323 protocol support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL && NF_CONNTRACK
+	help
+	  H.323 is a VoIP signalling protocol from ITU-T. As one of the most
+	  important VoIP protocols, it is widely used by voice hardware and
+	  software including voice gateways, IP phones, Netmeeting, OpenPhone,
+	  Gnomemeeting, etc.
+
+	  With this module you can support H.323 on a connection tracking/NAT
+	  firewall.
+
+	  This module supports RAS, Fast Start, H.245 Tunnelling, Call
+	  Forwarding, RTP/RTCP and T.120 based audio, video, fax, chat,
+	  whiteboard, file transfer, etc. For more information, please
+	  visit http://nath323.sourceforge.net/.
+
+	  To compile it as a module, choose M here.  If unsure, say N.
+
 config NF_CT_NETLINK
 	tristate 'Connection tracking netlink interface (EXPERIMENTAL)'
 	depends on EXPERIMENTAL && NF_CONNTRACK && NETFILTER_NETLINK
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index a5ee938..69b5545 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -20,8 +20,11 @@ obj-$(CONFIG_NF_CT_PROTO_SCTP) += nf_conntrack_proto_sctp.o
 obj-$(CONFIG_NF_CT_NETLINK) += nf_conntrack_netlink.o
 
 # connection tracking helpers
+nf_conntrack_h323-objs := nf_conntrack_h323_main.o nf_conntrack_h323_asn1.o
+
 obj-$(CONFIG_NF_CONNTRACK_AMANDA) += nf_conntrack_amanda.o
 obj-$(CONFIG_NF_CONNTRACK_FTP) += nf_conntrack_ftp.o
+obj-$(CONFIG_NF_CONNTRACK_H323) += nf_conntrack_h323.o
 
 # generic X tables 
 obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
diff --git a/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c b/net/netfilter/nf_conntrack_h323_asn1.c
index 26dfeca..f6fad71 100644
--- a/net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c
+++ b/net/netfilter/nf_conntrack_h323_asn1.c
@@ -15,7 +15,7 @@
 #else
 #include <stdio.h>
 #endif
-#include <linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h>
+#include <linux/netfilter/nf_conntrack_h323_asn1.h>
 
 /* Trace Flag */
 #ifndef H323_TRACE
@@ -144,7 +144,7 @@ static decoder_t Decoders[] = {
 /****************************************************************************
  * H.323 Types
  ****************************************************************************/
-#include "ip_conntrack_helper_h323_types.c"
+#include "nf_conntrack_h323_types.c"
 
 /****************************************************************************
  * Functions
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
new file mode 100644
index 0000000..6d85689
--- /dev/null
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -0,0 +1,1856 @@
+/*
+ * 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/module.h>
+#include <linux/moduleparam.h>
+#include <linux/ctype.h>
+#include <linux/inet.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <net/route.h>
+#include <net/ip6_route.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+#include <net/netfilter/nf_conntrack_expect.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <net/netfilter/nf_conntrack_helper.h>
+#include <linux/netfilter/nf_conntrack_h323.h>
+
+#if 0
+#define DEBUGP printk
+#else
+#define DEBUGP(format, args...)
+#endif
+
+/* Parameters */
+static unsigned int default_rrq_ttl __read_mostly = 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 __read_mostly = 1;
+module_param(gkrouted_only, int, 0600);
+MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
+
+static int callforward_filter __read_mostly = 1;
+module_param(callforward_filter, bool, 0600);
+MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
+		                     "if both endpoints are on different sides "
+				     "(determined by routing information)");
+
+/* Hooks for NAT */
+int (*set_h245_addr_hook) (struct sk_buff **pskb,
+			   unsigned char **data, int dataoff,
+			   H245_TransportAddress *taddr,
+			   union nf_conntrack_address *addr, __be16 port)
+			   __read_mostly;
+int (*set_h225_addr_hook) (struct sk_buff **pskb,
+			   unsigned char **data, int dataoff,
+			   TransportAddress *taddr,
+			   union nf_conntrack_address *addr, __be16 port)
+			   __read_mostly;
+int (*set_sig_addr_hook) (struct sk_buff **pskb,
+			  struct nf_conn *ct,
+			  enum ip_conntrack_info ctinfo,
+			  unsigned char **data,
+			  TransportAddress *taddr, int count) __read_mostly;
+int (*set_ras_addr_hook) (struct sk_buff **pskb,
+			  struct nf_conn *ct,
+			  enum ip_conntrack_info ctinfo,
+			  unsigned char **data,
+			  TransportAddress *taddr, int count) __read_mostly;
+int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb,
+			  struct nf_conn *ct,
+			  enum ip_conntrack_info ctinfo,
+			  unsigned char **data, int dataoff,
+			  H245_TransportAddress *taddr,
+			  __be16 port, __be16 rtp_port,
+			  struct nf_conntrack_expect *rtp_exp,
+			  struct nf_conntrack_expect *rtcp_exp) __read_mostly;
+int (*nat_t120_hook) (struct sk_buff **pskb,
+		      struct nf_conn *ct,
+		      enum ip_conntrack_info ctinfo,
+		      unsigned char **data, int dataoff,
+		      H245_TransportAddress *taddr, __be16 port,
+		      struct nf_conntrack_expect *exp) __read_mostly;
+int (*nat_h245_hook) (struct sk_buff **pskb,
+		      struct nf_conn *ct,
+		      enum ip_conntrack_info ctinfo,
+		      unsigned char **data, int dataoff,
+		      TransportAddress *taddr, __be16 port,
+		      struct nf_conntrack_expect *exp) __read_mostly;
+int (*nat_callforwarding_hook) (struct sk_buff **pskb,
+				struct nf_conn *ct,
+				enum ip_conntrack_info ctinfo,
+				unsigned char **data, int dataoff,
+				TransportAddress *taddr, __be16 port,
+				struct nf_conntrack_expect *exp) __read_mostly;
+int (*nat_q931_hook) (struct sk_buff **pskb,
+		      struct nf_conn *ct,
+		      enum ip_conntrack_info ctinfo,
+		      unsigned char **data, TransportAddress *taddr, int idx,
+		      __be16 port, struct nf_conntrack_expect *exp)
+		      __read_mostly;
+
+static DEFINE_SPINLOCK(nf_h323_lock);
+static char *h323_buffer;
+
+static struct nf_conntrack_helper nf_conntrack_helper_h245;
+static struct nf_conntrack_helper nf_conntrack_helper_q931[];
+static struct nf_conntrack_helper nf_conntrack_helper_ras[];
+
+/****************************************************************************/
+static int get_tpkt_data(struct sk_buff **pskb, unsigned int protoff,
+			 struct nf_conn *ct, enum ip_conntrack_info ctinfo,
+			 unsigned char **data, int *datalen, int *dataoff)
+{
+	struct nf_ct_h323_master *info = &nfct_help(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, protoff, sizeof(_tcph), &_tcph);
+	if (th == NULL)
+		return 0;
+
+	/* Get TCP data offset */
+	tcpdataoff = protoff + 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("nf_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("nf_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("nf_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("nf_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(struct nf_conn *ct, unsigned char *data,
+			 H245_TransportAddress *taddr,
+			 union nf_conntrack_address *addr, __be16 *port)
+{
+	unsigned char *p;
+	int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+	int len;
+
+	if (taddr->choice != eH245_TransportAddress_unicastAddress)
+		return 0;
+
+	switch (taddr->unicastAddress.choice) {
+	case eUnicastAddress_iPAddress:
+		if (family != AF_INET)
+			return 0;
+		p = data + taddr->unicastAddress.iPAddress.network;
+		len = 4;
+		break;
+	case eUnicastAddress_iP6Address:
+		if (family != AF_INET6)
+			return 0;
+		p = data + taddr->unicastAddress.iP6Address.network;
+		len = 16;
+		break;
+	default:
+		return 0;
+	}
+
+	memcpy(addr, p, len);
+	memset((void *)addr + len, 0, sizeof(*addr) - len);
+	memcpy(port, p + len, sizeof(__be16));
+
+	return 1;
+}
+
+/****************************************************************************/
+static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct,
+			   enum ip_conntrack_info ctinfo,
+			   unsigned char **data, int dataoff,
+			   H245_TransportAddress *taddr)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	__be16 rtp_port, rtcp_port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *rtp_exp;
+	struct nf_conntrack_expect *rtcp_exp;
+	typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
+
+	/* Read RTP or RTCP address */
+	if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
+	    memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
+	    port == 0)
+		return 0;
+
+	/* RTP port is even */
+	port &= htons(~1);
+	rtp_port = port;
+	rtcp_port = htons(ntohs(port) + 1);
+
+	/* Create expect for RTP */
+	if ((rtp_exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3,
+				 &ct->tuplehash[!dir].tuple.dst.u3,
+				 IPPROTO_UDP, NULL, &rtp_port);
+
+	/* Create expect for RTCP */
+	if ((rtcp_exp = nf_conntrack_expect_alloc(ct)) == NULL) {
+		nf_conntrack_expect_put(rtp_exp);
+		return -1;
+	}
+	nf_conntrack_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3,
+				 &ct->tuplehash[!dir].tuple.dst.u3,
+				 IPPROTO_UDP, NULL, &rtcp_port);
+
+	if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
+	   	   &ct->tuplehash[!dir].tuple.dst.u3,
+		   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
+		   (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
+		   ct->status & IPS_NAT_MASK) {
+		/* NAT needed */
+		ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff,
+				   taddr, port, rtp_port, rtp_exp, rtcp_exp);
+	} else {		/* Conntrack only */
+		if (nf_conntrack_expect_related(rtp_exp) == 0) {
+			if (nf_conntrack_expect_related(rtcp_exp) == 0) {
+				DEBUGP("nf_ct_h323: expect RTP ");
+				NF_CT_DUMP_TUPLE(&rtp_exp->tuple);
+				DEBUGP("nf_ct_h323: expect RTCP ");
+				NF_CT_DUMP_TUPLE(&rtcp_exp->tuple);
+			} else {
+				nf_conntrack_unexpect_related(rtp_exp);
+				ret = -1;
+			}
+		} else
+			ret = -1;
+	}
+
+	nf_conntrack_expect_put(rtp_exp);
+	nf_conntrack_expect_put(rtcp_exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int expect_t120(struct sk_buff **pskb,
+		       struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, int dataoff,
+		       H245_TransportAddress *taddr)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+	typeof(nat_t120_hook) nat_t120;
+
+	/* Read T.120 address */
+	if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
+	    memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
+	    port == 0)
+		return 0;
+
+	/* Create expect for T.120 connections */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3,
+				 &ct->tuplehash[!dir].tuple.dst.u3,
+				 IPPROTO_TCP, NULL, &port);
+	exp->flags = NF_CT_EXPECT_PERMANENT;	/* Accept multiple channels */
+
+	if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
+		   &ct->tuplehash[!dir].tuple.dst.u3,
+		   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
+	    (nat_t120 = rcu_dereference(nat_t120_hook)) &&
+	    ct->status & IPS_NAT_MASK) {
+		/* NAT needed */
+		ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr,
+			       port, exp);
+	} else {		/* Conntrack only */
+		if (nf_conntrack_expect_related(exp) == 0) {
+			DEBUGP("nf_ct_h323: expect T.120 ");
+			NF_CT_DUMP_TUPLE(&exp->tuple);
+		} else
+			ret = -1;
+	}
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_h245_channel(struct sk_buff **pskb,
+				struct nf_conn *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 nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, int dataoff,
+		       OpenLogicalChannel *olc)
+{
+	int ret;
+
+	DEBUGP("nf_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 nf_conn *ct,
+			enum ip_conntrack_info ctinfo,
+			unsigned char **data, int dataoff,
+			OpenLogicalChannelAck *olca)
+{
+	H2250LogicalChannelAckParameters *ack;
+	int ret;
+
+	DEBUGP("nf_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 nf_conn *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("nf_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("nf_ct_h323: H.245 Response %d\n",
+		       mscm->response.choice);
+		break;
+	default:
+		DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice);
+		break;
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int h245_help(struct sk_buff **pskb, unsigned int protoff,
+		     struct nf_conn *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("nf_ct_h245: skblen = %u\n", (*pskb)->len);
+
+	spin_lock_bh(&nf_h323_lock);
+
+	/* Process each TPKT */
+	while (get_tpkt_data(pskb, protoff, ct, ctinfo,
+			     &data, &datalen, &dataoff)) {
+		DEBUGP("nf_ct_h245: TPKT len=%d ", datalen);
+		NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
+
+		/* Decode H.245 signal */
+		ret = DecodeMultimediaSystemControlMessage(data, datalen,
+							   &mscm);
+		if (ret < 0) {
+			if (net_ratelimit())
+				printk("nf_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(&nf_h323_lock);
+	return NF_ACCEPT;
+
+      drop:
+	spin_unlock_bh(&nf_h323_lock);
+	if (net_ratelimit())
+		printk("nf_ct_h245: packet dropped\n");
+	return NF_DROP;
+}
+
+/****************************************************************************/
+static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
+	.name			= "H.245",
+	.me			= THIS_MODULE,
+	.max_expected		= H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
+	.timeout		= 240,
+	.tuple.dst.protonum	= IPPROTO_UDP,
+	.mask.src.u.udp.port	= __constant_htons(0xFFFF),
+	.mask.dst.protonum	= 0xFF,
+	.help			= h245_help
+};
+
+/****************************************************************************/
+int get_h225_addr(struct nf_conn *ct, unsigned char *data,
+		  TransportAddress *taddr,
+		  union nf_conntrack_address *addr, __be16 *port)
+{
+	unsigned char *p;
+	int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+	int len;
+
+	switch (taddr->choice) {
+	case eTransportAddress_ipAddress:
+		if (family != AF_INET)
+			return 0;
+		p = data + taddr->ipAddress.ip;
+		len = 4;
+		break;
+	case eTransportAddress_ip6Address:
+		if (family != AF_INET6)
+			return 0;
+		p = data + taddr->ip6Address.ip6;
+		len = 16;
+		break;
+	default:
+		return 0;
+	}
+
+	memcpy(addr, p, len);
+	memset((void *)addr + len, 0, sizeof(*addr) - len);
+	memcpy(port, p + len, sizeof(__be16));
+
+	return 1;
+}
+
+/****************************************************************************/
+static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, int dataoff,
+		       TransportAddress *taddr)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+	typeof(nat_h245_hook) nat_h245;
+
+	/* Read h245Address */
+	if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
+	    memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
+	    port == 0)
+		return 0;
+
+	/* Create expect for h245 connection */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3,
+				 &ct->tuplehash[!dir].tuple.dst.u3,
+				 IPPROTO_TCP, NULL, &port);
+	exp->helper = &nf_conntrack_helper_h245;
+
+	if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
+		   &ct->tuplehash[!dir].tuple.dst.u3,
+		   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
+	    (nat_h245 = rcu_dereference(nat_h245_hook)) &&
+	    ct->status & IPS_NAT_MASK) {
+		/* NAT needed */
+		ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr,
+			       port, exp);
+	} else {		/* Conntrack only */
+		if (nf_conntrack_expect_related(exp) == 0) {
+			DEBUGP("nf_ct_q931: expect H.245 ");
+			NF_CT_DUMP_TUPLE(&exp->tuple);
+		} else
+			ret = -1;
+	}
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/* If the calling party is on the same side of the forward-to party,
+ * we don't need to track the second call */
+static int callforward_do_filter(union nf_conntrack_address *src,
+				 union nf_conntrack_address *dst,
+				 int family)
+{
+	struct flowi fl1, fl2;
+	int ret = 0;
+
+	memset(&fl1, 0, sizeof(fl1));
+	memset(&fl2, 0, sizeof(fl2));
+
+	switch (family) {
+	case AF_INET: {
+		struct rtable *rt1, *rt2;
+
+		fl1.fl4_dst = src->ip;
+		fl2.fl4_dst = dst->ip;
+		if (ip_route_output_key(&rt1, &fl1) == 0) {
+			if (ip_route_output_key(&rt2, &fl2) == 0) {
+				if (rt1->rt_gateway == rt2->rt_gateway &&
+				    rt1->u.dst.dev  == rt2->u.dst.dev)
+					ret = 1;
+				dst_release(&rt2->u.dst);
+			}
+			dst_release(&rt1->u.dst);
+		}
+		break;
+	}
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	case AF_INET6: {
+		struct rt6_info *rt1, *rt2;
+
+		memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst));
+		memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst));
+		rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1);
+		if (rt1) {
+			rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2);
+			if (rt2) {
+				if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
+				 	    sizeof(rt1->rt6i_gateway)) &&
+				    rt1->u.dst.dev == rt2->u.dst.dev)
+					ret = 1;
+				dst_release(&rt2->u.dst);
+			}
+			dst_release(&rt1->u.dst);
+		}
+		break;
+	}
+#endif
+	}
+	return ret;
+
+}
+
+/****************************************************************************/
+static int expect_callforwarding(struct sk_buff **pskb,
+				 struct nf_conn *ct,
+				 enum ip_conntrack_info ctinfo,
+				 unsigned char **data, int dataoff,
+				 TransportAddress *taddr)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+	typeof(nat_callforwarding_hook) nat_callforwarding;
+
+	/* Read alternativeAddress */
+	if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
+		return 0;
+
+	/* If the calling party is on the same side of the forward-to party,
+	 * we don't need to track the second call */
+	if (callforward_filter &&
+	    callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
+	    			  ct->tuplehash[!dir].tuple.src.l3num)) {
+		DEBUGP("nf_ct_q931: Call Forwarding not tracked\n");
+		return 0;
+	}
+
+	/* Create expect for the second call leg */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3, &addr,
+				 IPPROTO_TCP, NULL, &port);
+	exp->helper = nf_conntrack_helper_q931;
+
+	if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
+		   &ct->tuplehash[!dir].tuple.dst.u3,
+		   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
+	    (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
+	    ct->status & IPS_NAT_MASK) {
+		/* Need NAT */
+		ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff,
+					 taddr, port, exp);
+	} else {		/* Conntrack only */
+		if (nf_conntrack_expect_related(exp) == 0) {
+			DEBUGP("nf_ct_q931: expect Call Forwarding ");
+			NF_CT_DUMP_TUPLE(&exp->tuple);
+		} else
+			ret = -1;
+	}
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_setup(struct sk_buff **pskb, struct nf_conn *ct,
+			 enum ip_conntrack_info ctinfo,
+			 unsigned char **data, int dataoff,
+			 Setup_UUIE *setup)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret;
+	int i;
+	__be16 port;
+	union nf_conntrack_address addr;
+	typeof(set_h225_addr_hook) set_h225_addr;
+
+	DEBUGP("nf_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;
+	}
+
+	set_h225_addr = rcu_dereference(set_h225_addr_hook);
+	if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
+	    (set_h225_addr) && ct->status && IPS_NAT_MASK &&
+	    get_h225_addr(ct, *data, &setup->destCallSignalAddress,
+	    		  &addr, &port) &&
+	    memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
+		DEBUGP("nf_ct_q931: set destCallSignalAddress "
+		       NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
+		       NIP6(*(struct in6_addr *)&addr), ntohs(port),
+		       NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3),
+		       ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
+		ret = set_h225_addr(pskb, data, dataoff,
+				    &setup->destCallSignalAddress,
+				    &ct->tuplehash[!dir].tuple.src.u3,
+				    ct->tuplehash[!dir].tuple.src.u.tcp.port);
+		if (ret < 0)
+			return -1;
+	}
+
+	if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
+	    (set_h225_addr) && ct->status & IPS_NAT_MASK &&
+	    get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
+	    		  &addr, &port) &&
+	    memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
+		DEBUGP("nf_ct_q931: set sourceCallSignalAddress "
+		       NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n",
+		       NIP6(*(struct in6_addr *)&addr), ntohs(port),
+		       NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3),
+		       ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
+		ret = set_h225_addr(pskb, data, dataoff,
+				    &setup->sourceCallSignalAddress,
+				    &ct->tuplehash[!dir].tuple.dst.u3,
+				    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 nf_conn *ct,
+				  enum ip_conntrack_info ctinfo,
+				  unsigned char **data, int dataoff,
+				  CallProceeding_UUIE *callproc)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_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 nf_conn *ct,
+			   enum ip_conntrack_info ctinfo,
+			   unsigned char **data, int dataoff,
+			   Connect_UUIE *connect)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_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 nf_conn *ct,
+			    enum ip_conntrack_info ctinfo,
+			    unsigned char **data, int dataoff,
+			    Alerting_UUIE *alert)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_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 nf_conn *ct,
+			       enum ip_conntrack_info ctinfo,
+			       unsigned char **data, int dataoff,
+			       Information_UUIE *info)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_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 nf_conn *ct,
+			    enum ip_conntrack_info ctinfo,
+			    unsigned char **data, int dataoff,
+			    Facility_UUIE *facility)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_ct_q931: Facility\n");
+
+	if (facility->reason.choice == eFacilityReason_callForwarded) {
+		if (facility->options & eFacility_UUIE_alternativeAddress)
+			return expect_callforwarding(pskb, ct, ctinfo, data,
+						     dataoff,
+						     &facility->
+						     alternativeAddress);
+		return 0;
+	}
+
+	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 nf_conn *ct,
+			    enum ip_conntrack_info ctinfo,
+			    unsigned char **data, int dataoff,
+			    Progress_UUIE *progress)
+{
+	int ret;
+	int i;
+
+	DEBUGP("nf_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 nf_conn *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("nf_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, unsigned int protoff,
+		     struct nf_conn *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("nf_ct_q931: skblen = %u\n", (*pskb)->len);
+
+	spin_lock_bh(&nf_h323_lock);
+
+	/* Process each TPKT */
+	while (get_tpkt_data(pskb, protoff, ct, ctinfo,
+			     &data, &datalen, &dataoff)) {
+		DEBUGP("nf_ct_q931: TPKT len=%d ", datalen);
+		NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
+
+		/* Decode Q.931 signal */
+		ret = DecodeQ931(data, datalen, &q931);
+		if (ret < 0) {
+			if (net_ratelimit())
+				printk("nf_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(&nf_h323_lock);
+	return NF_ACCEPT;
+
+      drop:
+	spin_unlock_bh(&nf_h323_lock);
+	if (net_ratelimit())
+		printk("nf_ct_q931: packet dropped\n");
+	return NF_DROP;
+}
+
+/****************************************************************************/
+static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
+	{
+		.name			= "Q.931",
+		.me			= THIS_MODULE,
+					  /* T.120 and H.245 */
+		.max_expected		= H323_RTP_CHANNEL_MAX * 4 + 4,
+		.timeout		= 240,
+		.tuple.src.l3num	= AF_INET,
+		.tuple.src.u.tcp.port	= __constant_htons(Q931_PORT),
+		.tuple.dst.protonum	= IPPROTO_TCP,
+		.mask.src.l3num		= 0xFFFF,
+		.mask.src.u.tcp.port	= __constant_htons(0xFFFF),
+		.mask.dst.protonum	= 0xFF,
+		.help			= q931_help
+	},
+	{
+		.name			= "Q.931",
+		.me			= THIS_MODULE,
+					  /* T.120 and H.245 */
+		.max_expected		= H323_RTP_CHANNEL_MAX * 4 + 4,
+		.timeout		= 240,
+		.tuple.src.l3num	= AF_INET6,
+		.tuple.src.u.tcp.port	= __constant_htons(Q931_PORT),
+		.tuple.dst.protonum	= IPPROTO_TCP,
+		.mask.src.l3num		= 0xFFFF,
+		.mask.src.u.tcp.port	= __constant_htons(0xFFFF),
+		.mask.dst.protonum	= 0xFF,
+		.help			= q931_help
+	},
+};
+
+/****************************************************************************/
+static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff,
+				   int *datalen)
+{
+	struct udphdr _uh, *uh;
+	int dataoff;
+
+	uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh);
+	if (uh == NULL)
+		return NULL;
+	dataoff = protoff + sizeof(_uh);
+	if (dataoff >= (*pskb)->len)
+		return NULL;
+	*datalen = (*pskb)->len - dataoff;
+	return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer);
+}
+
+/****************************************************************************/
+static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
+					       union nf_conntrack_address *addr,
+					       __be16 port)
+{
+	struct nf_conntrack_expect *exp;
+	struct nf_conntrack_tuple tuple;
+
+	memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
+	tuple.src.u.tcp.port = 0;
+	memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
+	tuple.dst.u.tcp.port = port;
+	tuple.dst.protonum = IPPROTO_TCP;
+
+	exp = __nf_conntrack_expect_find(&tuple);
+	if (exp && exp->master == ct)
+		return exp;
+	return NULL;
+}
+
+/****************************************************************************/
+static int set_expect_timeout(struct nf_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 nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data,
+		       TransportAddress *taddr, int count)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	int i;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+	typeof(nat_q931_hook) nat_q931;
+
+	/* Look for the first related address */
+	for (i = 0; i < count; i++) {
+		if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
+		    memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
+		    	   sizeof(addr)) == 0 && port != 0)
+			break;
+	}
+
+	if (i >= count)		/* Not found */
+		return 0;
+
+	/* Create expect for Q.931 */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 gkrouted_only ? /* only accept calls from GK? */
+				 	&ct->tuplehash[!dir].tuple.src.u3 :
+					NULL,
+				 &ct->tuplehash[!dir].tuple.dst.u3,
+				 IPPROTO_TCP, NULL, &port);
+	exp->helper = nf_conntrack_helper_q931;
+	exp->flags = NF_CT_EXPECT_PERMANENT;	/* Accept multiple calls */
+
+	nat_q931 = rcu_dereference(nat_q931_hook);
+	if (nat_q931 && ct->status & IPS_NAT_MASK) {	/* Need NAT */
+		ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp);
+	} else {		/* Conntrack only */
+		if (nf_conntrack_expect_related(exp) == 0) {
+			DEBUGP("nf_ct_ras: expect Q.931 ");
+			NF_CT_DUMP_TUPLE(&exp->tuple);
+
+			/* Save port for looking up expect in processing RCF */
+			info->sig_port[dir] = port;
+		} else
+			ret = -1;
+	}
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_grq(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, GatekeeperRequest *grq)
+{
+	typeof(set_ras_addr_hook) set_ras_addr;
+
+	DEBUGP("nf_ct_ras: GRQ\n");
+
+	set_ras_addr = rcu_dereference(set_ras_addr_hook);
+	if (set_ras_addr && ct->status & IPS_NAT_MASK)	/* NATed */
+		return set_ras_addr(pskb, ct, ctinfo, data,
+				    &grq->rasAddress, 1);
+	return 0;
+}
+
+/****************************************************************************/
+static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, GatekeeperConfirm *gcf)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+
+	DEBUGP("nf_ct_ras: GCF\n");
+
+	if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
+		return 0;
+
+	/* Registration port is the same as discovery port */
+	if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
+	    port == 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 = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3, &addr,
+				 IPPROTO_UDP, NULL, &port);
+	exp->helper = nf_conntrack_helper_ras;
+
+	if (nf_conntrack_expect_related(exp) == 0) {
+		DEBUGP("nf_ct_ras: expect RAS ");
+		NF_CT_DUMP_TUPLE(&exp->tuple);
+	} else
+		ret = -1;
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, RegistrationRequest *rrq)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int ret;
+	typeof(set_ras_addr_hook) set_ras_addr;
+
+	DEBUGP("nf_ct_ras: RRQ\n");
+
+	ret = expect_q931(pskb, ct, ctinfo, data,
+			  rrq->callSignalAddress.item,
+			  rrq->callSignalAddress.count);
+	if (ret < 0)
+		return -1;
+
+	set_ras_addr = rcu_dereference(set_ras_addr_hook);
+	if (set_ras_addr && ct->status & IPS_NAT_MASK) {
+		ret = set_ras_addr(pskb, ct, ctinfo, data,
+				   rrq->rasAddress.item,
+				   rrq->rasAddress.count);
+		if (ret < 0)
+			return -1;
+	}
+
+	if (rrq->options & eRegistrationRequest_timeToLive) {
+		DEBUGP("nf_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 nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, RegistrationConfirm *rcf)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	int ret;
+	struct nf_conntrack_expect *exp;
+	typeof(set_sig_addr_hook) set_sig_addr;
+
+	DEBUGP("nf_ct_ras: RCF\n");
+
+	set_sig_addr = rcu_dereference(set_sig_addr_hook);
+	if (set_sig_addr && ct->status & IPS_NAT_MASK) {
+		ret = set_sig_addr(pskb, ct, ctinfo, data,
+					rcf->callSignalAddress.item,
+					rcf->callSignalAddress.count);
+		if (ret < 0)
+			return -1;
+	}
+
+	if (rcf->options & eRegistrationConfirm_timeToLive) {
+		DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
+		info->timeout = rcf->timeToLive;
+	}
+
+	if (info->timeout > 0) {
+		DEBUGP
+		    ("nf_ct_ras: set RAS connection timeout to %u seconds\n",
+		     info->timeout);
+		nf_ct_refresh(ct, *pskb, info->timeout * HZ);
+
+		/* Set expect timeout */
+		read_lock_bh(&nf_conntrack_lock);
+		exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
+				  info->sig_port[!dir]);
+		if (exp) {
+			DEBUGP("nf_ct_ras: set Q.931 expect "
+			       "timeout to %u seconds for",
+			       info->timeout);
+			NF_CT_DUMP_TUPLE(&exp->tuple);
+			set_expect_timeout(exp, info->timeout);
+		}
+		read_unlock_bh(&nf_conntrack_lock);
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int process_urq(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, UnregistrationRequest *urq)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	int ret;
+	typeof(set_sig_addr_hook) set_sig_addr;
+
+	DEBUGP("nf_ct_ras: URQ\n");
+
+	set_sig_addr = rcu_dereference(set_sig_addr_hook);
+	if (set_sig_addr && ct->status & IPS_NAT_MASK) {
+		ret = set_sig_addr(pskb, ct, ctinfo, data,
+				   urq->callSignalAddress.item,
+				   urq->callSignalAddress.count);
+		if (ret < 0)
+			return -1;
+	}
+
+	/* Clear old expect */
+	nf_ct_remove_expectations(ct);
+	info->sig_port[dir] = 0;
+	info->sig_port[!dir] = 0;
+
+	/* Give it 30 seconds for UCF or URJ */
+	nf_ct_refresh(ct, *pskb, 30 * HZ);
+
+	return 0;
+}
+
+/****************************************************************************/
+static int process_arq(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, AdmissionRequest *arq)
+{
+	struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info;
+	int dir = CTINFO2DIR(ctinfo);
+	__be16 port;
+	union nf_conntrack_address addr;
+	typeof(set_h225_addr_hook) set_h225_addr;
+
+	DEBUGP("nf_ct_ras: ARQ\n");
+
+	set_h225_addr = rcu_dereference(set_h225_addr_hook);
+	if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
+	    get_h225_addr(ct, *data, &arq->destCallSignalAddress,
+	    		  &addr, &port) &&
+	    !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
+	    port == info->sig_port[dir] &&
+	    set_h225_addr && ct->status & IPS_NAT_MASK) {
+		/* Answering ARQ */
+		return set_h225_addr(pskb, data, 0,
+				     &arq->destCallSignalAddress,
+				     &ct->tuplehash[!dir].tuple.dst.u3,
+				     info->sig_port[!dir]);
+	}
+
+	if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
+	    get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
+	    		  &addr, &port) &&
+	    !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
+	    set_h225_addr && ct->status & IPS_NAT_MASK) {
+		/* Calling ARQ */
+		return set_h225_addr(pskb, data, 0,
+				     &arq->srcCallSignalAddress,
+				     &ct->tuplehash[!dir].tuple.dst.u3,
+				     port);
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int process_acf(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, AdmissionConfirm *acf)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+	typeof(set_sig_addr_hook) set_sig_addr;
+
+	DEBUGP("nf_ct_ras: ACF\n");
+
+	if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
+			   &addr, &port))
+		return 0;
+
+	if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
+		/* Answering ACF */
+		set_sig_addr = rcu_dereference(set_sig_addr_hook);
+		if (set_sig_addr && ct->status & IPS_NAT_MASK)
+			return set_sig_addr(pskb, ct, ctinfo, data,
+					    &acf->destCallSignalAddress, 1);
+		return 0;
+	}
+
+	/* Need new expect */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3, &addr,
+				 IPPROTO_TCP, NULL, &port);
+	exp->flags = NF_CT_EXPECT_PERMANENT;
+	exp->helper = nf_conntrack_helper_q931;
+
+	if (nf_conntrack_expect_related(exp) == 0) {
+		DEBUGP("nf_ct_ras: expect Q.931 ");
+		NF_CT_DUMP_TUPLE(&exp->tuple);
+	} else
+		ret = -1;
+
+	nf_conntrack_expect_put(exp);
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, LocationRequest *lrq)
+{
+	typeof(set_ras_addr_hook) set_ras_addr;
+
+	DEBUGP("nf_ct_ras: LRQ\n");
+
+	set_ras_addr = rcu_dereference(set_ras_addr_hook);
+	if (set_ras_addr && ct->status & IPS_NAT_MASK)
+		return set_ras_addr(pskb, ct, ctinfo, data,
+				    &lrq->replyAddress, 1);
+	return 0;
+}
+
+/****************************************************************************/
+static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, LocationConfirm *lcf)
+{
+	int dir = CTINFO2DIR(ctinfo);
+	int ret = 0;
+	__be16 port;
+	union nf_conntrack_address addr;
+	struct nf_conntrack_expect *exp;
+
+	DEBUGP("nf_ct_ras: LCF\n");
+
+	if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
+			   &addr, &port))
+		return 0;
+
+	/* Need new expect for call signal */
+	if ((exp = nf_conntrack_expect_alloc(ct)) == NULL)
+		return -1;
+	nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num,
+				 &ct->tuplehash[!dir].tuple.src.u3, &addr,
+				 IPPROTO_TCP, NULL, &port);
+	exp->flags = NF_CT_EXPECT_PERMANENT;
+	exp->helper = nf_conntrack_helper_q931;
+
+	if (nf_conntrack_expect_related(exp) == 0) {
+		DEBUGP("nf_ct_ras: expect Q.931 ");
+		NF_CT_DUMP_TUPLE(&exp->tuple);
+	} else
+		ret = -1;
+
+	nf_conntrack_expect_put(exp);
+
+	/* Ignore rasAddress */
+
+	return ret;
+}
+
+/****************************************************************************/
+static int process_irr(struct sk_buff **pskb, struct nf_conn *ct,
+		       enum ip_conntrack_info ctinfo,
+		       unsigned char **data, InfoRequestResponse *irr)
+{
+	int ret;
+	typeof(set_ras_addr_hook) set_ras_addr;
+	typeof(set_sig_addr_hook) set_sig_addr;
+
+	DEBUGP("nf_ct_ras: IRR\n");
+
+	set_ras_addr = rcu_dereference(set_ras_addr_hook);
+	if (set_ras_addr && ct->status & IPS_NAT_MASK) {
+		ret = set_ras_addr(pskb, ct, ctinfo, data,
+				   &irr->rasAddress, 1);
+		if (ret < 0)
+			return -1;
+	}
+
+	set_sig_addr = rcu_dereference(set_sig_addr_hook);
+	if (set_sig_addr && ct->status & IPS_NAT_MASK) {
+		ret = set_sig_addr(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 nf_conn *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("nf_ct_ras: RAS message %d\n", ras->choice);
+		break;
+	}
+
+	return 0;
+}
+
+/****************************************************************************/
+static int ras_help(struct sk_buff **pskb, unsigned int protoff,
+		    struct nf_conn *ct, enum ip_conntrack_info ctinfo)
+{
+	static RasMessage ras;
+	unsigned char *data;
+	int datalen = 0;
+	int ret;
+
+	DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len);
+
+	spin_lock_bh(&nf_h323_lock);
+
+	/* Get UDP data */
+	data = get_udp_data(pskb, protoff, &datalen);
+	if (data == NULL)
+		goto accept;
+	DEBUGP("nf_ct_ras: RAS message len=%d ", datalen);
+	NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
+
+	/* Decode RAS message */
+	ret = DecodeRasMessage(data, datalen, &ras);
+	if (ret < 0) {
+		if (net_ratelimit())
+			printk("nf_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(&nf_h323_lock);
+	return NF_ACCEPT;
+
+      drop:
+	spin_unlock_bh(&nf_h323_lock);
+	if (net_ratelimit())
+		printk("nf_ct_ras: packet dropped\n");
+	return NF_DROP;
+}
+
+/****************************************************************************/
+static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
+	{
+		.name			= "RAS",
+		.me			= THIS_MODULE,
+		.max_expected		= 32,
+		.timeout		= 240,
+		.tuple.src.l3num	= AF_INET,
+		.tuple.src.u.udp.port	= __constant_htons(RAS_PORT),
+		.tuple.dst.protonum	= IPPROTO_UDP,
+		.mask.src.l3num		= 0xFFFF,
+		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
+		.mask.dst.protonum	= 0xFF,
+		.help			= ras_help,
+	},
+	{
+		.name			= "RAS",
+		.me			= THIS_MODULE,
+		.max_expected		= 32,
+		.timeout		= 240,
+		.tuple.src.l3num	= AF_INET6,
+		.tuple.src.u.udp.port	= __constant_htons(RAS_PORT),
+		.tuple.dst.protonum	= IPPROTO_UDP,
+		.mask.src.l3num		= 0xFFFF,
+		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
+		.mask.dst.protonum	= 0xFF,
+		.help			= ras_help,
+	},
+};
+
+/****************************************************************************/
+static void __exit nf_conntrack_h323_fini(void)
+{
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
+	kfree(h323_buffer);
+	DEBUGP("nf_ct_h323: fini\n");
+}
+
+/****************************************************************************/
+static int __init nf_conntrack_h323_init(void)
+{
+	int ret;
+
+	h323_buffer = kmalloc(65536, GFP_KERNEL);
+	if (!h323_buffer)
+		return -ENOMEM;
+	ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
+	if (ret < 0)
+		goto err1;
+	ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
+	if (ret < 0)
+		goto err2;
+	ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
+	if (ret < 0)
+		goto err3;
+	ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
+	if (ret < 0)
+		goto err4;
+	DEBUGP("nf_ct_h323: init success\n");
+	return 0;
+
+err4:
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
+err3:
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
+err2:
+	nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
+err1:
+	return ret;
+}
+
+/****************************************************************************/
+module_init(nf_conntrack_h323_init);
+module_exit(nf_conntrack_h323_fini);
+
+EXPORT_SYMBOL_GPL(get_h225_addr);
+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_callforwarding_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");
+MODULE_ALIAS("ip_conntrack_h323");
diff --git a/net/ipv4/netfilter/ip_conntrack_helper_h323_types.c b/net/netfilter/nf_conntrack_h323_types.c
index 4b35961..4c6f8b3 100644
--- a/net/ipv4/netfilter/ip_conntrack_helper_h323_types.c
+++ b/net/netfilter/nf_conntrack_h323_types.c
@@ -36,7 +36,8 @@ static field_t _TransportAddress_ipxAddress[] = {	/* SEQUENCE */
 };
 
 static field_t _TransportAddress_ip6Address[] = {	/* SEQUENCE */
-	{FNAME("ip") OCTSTR, FIXD, 16, 0, SKIP, 0, NULL},
+	{FNAME("ip") OCTSTR, FIXD, 16, 0, DECODE,
+	 offsetof(TransportAddress_ip6Address, ip6), NULL},
 	{FNAME("port") INT, WORD, 0, 0, SKIP, 0, NULL},
 };
 
@@ -65,8 +66,8 @@ static field_t _TransportAddress[] = {	/* CHOICE */
 	 _TransportAddress_ipSourceRoute},
 	{FNAME("ipxAddress") SEQ, 0, 3, 3, SKIP, 0,
 	 _TransportAddress_ipxAddress},
-	{FNAME("ip6Address") SEQ, 0, 2, 2, SKIP | EXT, 0,
-	 _TransportAddress_ip6Address},
+	{FNAME("ip6Address") SEQ, 0, 2, 2, DECODE | EXT,
+	offsetof(TransportAddress, ip6Address), _TransportAddress_ip6Address},
 	{FNAME("netBios") OCTSTR, FIXD, 16, 0, SKIP, 0, NULL},
 	{FNAME("nsap") OCTSTR, 5, 1, 0, SKIP, 0, NULL},
 	{FNAME("nonStandardAddress") SEQ, 0, 2, 2, SKIP, 0,