[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>

include/linux/netfilter/nf_conntrack_h323.h

+#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

include/linux/netfilter_ipv4/ip_conntrack_helper_h323_asn1.h → include/linux/netfilter/nf_conntrack_h323_asn1.h

 /****************************************************************************
- * 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 {

include/linux/netfilter_ipv4/ip_conntrack_helper_h323_types.h → 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;
 

include/linux/netfilter_ipv4/Kbuild

 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

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

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>

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;

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

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

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

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

net/ipv4/netfilter/ip_conntrack_helper_h323_asn1.c → 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

net/ipv4/netfilter/ip_conntrack_helper_h323_types.c → 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,