remove current RTSP support

SVN-Revision: 29643

1 files changed, 0 insertions, 1366 deletions

diff --git a/target/linux/generic/patches-2.6.31/190-netfilter_rtsp.patch b/target/linux/generic/patches-2.6.31/190-netfilter_rtsp.patch
deleted file mode 100644
index 29e82084ca..0000000000
--- a/target/linux/generic/patches-2.6.31/190-netfilter_rtsp.patch
+++ /dev/null
@@ -1,1366 +0,0 @@
---- /dev/null
-+++ b/include/linux/netfilter/nf_conntrack_rtsp.h
-@@ -0,0 +1,63 @@
-+/*
-+ * RTSP extension for IP connection tracking.
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.h
-+ *
-+ *      This program is free software; you can redistribute it and/or
-+ *      modify it under the terms of the GNU General Public License
-+ *      as published by the Free Software Foundation; either version
-+ *      2 of the License, or (at your option) any later version.
-+ */
-+#ifndef _IP_CONNTRACK_RTSP_H
-+#define _IP_CONNTRACK_RTSP_H
-+
-+//#define IP_NF_RTSP_DEBUG 1
-+#define IP_NF_RTSP_VERSION "0.6.21"
-+
-+#ifdef __KERNEL__
-+/* port block types */
-+typedef enum {
-+    pb_single,  /* client_port=x */
-+    pb_range,   /* client_port=x-y */
-+    pb_discon   /* client_port=x/y (rtspbis) */
-+} portblock_t;
-+
-+/* We record seq number and length of rtsp headers here, all in host order. */
-+
-+/*
-+ * This structure is per expected connection.  It is a member of struct
-+ * ip_conntrack_expect.  The TCP SEQ for the conntrack expect is stored
-+ * there and we are expected to only store the length of the data which
-+ * needs replaced.  If a packet contains multiple RTSP messages, we create
-+ * one expected connection per message.
-+ *
-+ * We use these variables to mark the entire header block.  This may seem
-+ * like overkill, but the nature of RTSP requires it.  A header may appear
-+ * multiple times in a message.  We must treat two Transport headers the
-+ * same as one Transport header with two entries.
-+ */
-+struct ip_ct_rtsp_expect
-+{
-+    u_int32_t   len;        /* length of header block */
-+    portblock_t pbtype;     /* Type of port block that was requested */
-+    u_int16_t   loport;     /* Port that was requested, low or first */
-+    u_int16_t   hiport;     /* Port that was requested, high or second */
-+#if 0
-+    uint        method;     /* RTSP method */
-+    uint        cseq;       /* CSeq from request */
-+#endif
-+};
-+
-+extern unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+				 enum ip_conntrack_info ctinfo,
-+				 unsigned int matchoff, unsigned int matchlen,
-+				 struct ip_ct_rtsp_expect *prtspexp,
-+				 struct nf_conntrack_expect *exp);
-+
-+extern void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+#define RTSP_PORT   554
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _IP_CONNTRACK_RTSP_H */
---- /dev/null
-+++ b/include/linux/netfilter_helpers.h
-@@ -0,0 +1,133 @@
-+/*
-+ * Helpers for netfiler modules.  This file provides implementations for basic
-+ * functions such as strncasecmp(), etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested.  The following macros are used:
-+ *   NF_NEED_STRNCASECMP        nf_strncasecmp()
-+ *   NF_NEED_STRTOU16           nf_strtou16()
-+ *   NF_NEED_STRTOU32           nf_strtou32()
-+ */
-+#ifndef _NETFILTER_HELPERS_H
-+#define _NETFILTER_HELPERS_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+#define iseol(c) ( (c) == '\r' || (c) == '\n' )
-+
-+/*
-+ * The standard strncasecmp()
-+ */
-+#ifdef NF_NEED_STRNCASECMP
-+static int
-+nf_strncasecmp(const char* s1, const char* s2, u_int32_t len)
-+{
-+    if (s1 == NULL || s2 == NULL)
-+    {
-+        if (s1 == NULL && s2 == NULL)
-+        {
-+            return 0;
-+        }
-+        return (s1 == NULL) ? -1 : 1;
-+    }
-+    while (len > 0 && tolower(*s1) == tolower(*s2))
-+    {
-+        len--;
-+        s1++;
-+        s2++;
-+    }
-+    return ( (len == 0) ? 0 : (tolower(*s1) - tolower(*s2)) );
-+}
-+#endif /* NF_NEED_STRNCASECMP */
-+
-+/*
-+ * Parse a string containing a 16-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU16
-+static int
-+nf_strtou16(const char* pbuf, u_int16_t* pval)
-+{
-+    int n = 0;
-+
-+    *pval = 0;
-+    while (isdigit(pbuf[n]))
-+    {
-+        *pval = (*pval * 10) + (pbuf[n] - '0');
-+        n++;
-+    }
-+
-+    return n;
-+}
-+#endif /* NF_NEED_STRTOU16 */
-+
-+/*
-+ * Parse a string containing a 32-bit unsigned integer.
-+ * Returns the number of chars used, or zero if no number is found.
-+ */
-+#ifdef NF_NEED_STRTOU32
-+static int
-+nf_strtou32(const char* pbuf, u_int32_t* pval)
-+{
-+    int n = 0;
-+
-+    *pval = 0;
-+    while (pbuf[n] >= '0' && pbuf[n] <= '9')
-+    {
-+        *pval = (*pval * 10) + (pbuf[n] - '0');
-+        n++;
-+    }
-+
-+    return n;
-+}
-+#endif /* NF_NEED_STRTOU32 */
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line.
-+ */
-+#ifdef NF_NEED_NEXTLINE
-+static int
-+nf_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+    uint    off = *poff;
-+    uint    physlen = 0;
-+
-+    if (off >= len)
-+    {
-+        return 0;
-+    }
-+
-+    while (p[off] != '\n')
-+    {
-+        if (len-off <= 1)
-+        {
-+            return 0;
-+        }
-+
-+        physlen++;
-+        off++;
-+    }
-+
-+    /* if we saw a crlf, physlen needs adjusted */
-+    if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+    {
-+        physlen--;
-+    }
-+
-+    /* advance past the newline */
-+    off++;
-+
-+    *plineoff = *poff;
-+    *plinelen = physlen;
-+    *poff = off;
-+
-+    return 1;
-+}
-+#endif /* NF_NEED_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_HELPERS_H */
---- /dev/null
-+++ b/include/linux/netfilter_mime.h
-@@ -0,0 +1,89 @@
-+/*
-+ * MIME functions for netfilter modules.  This file provides implementations
-+ * for basic MIME parsing.  MIME headers are used in many protocols, such as
-+ * HTTP, RTSP, SIP, etc.
-+ *
-+ * gcc will warn for defined but unused functions, so we only include the
-+ * functions requested.  The following macros are used:
-+ *   NF_NEED_MIME_NEXTLINE      nf_mime_nextline()
-+ */
-+#ifndef _NETFILTER_MIME_H
-+#define _NETFILTER_MIME_H
-+
-+/* Only include these functions for kernel code. */
-+#ifdef __KERNEL__
-+
-+#include <linux/ctype.h>
-+
-+/*
-+ * Given a buffer and length, advance to the next line and mark the current
-+ * line.  If the current line is empty, *plinelen will be set to zero.  If
-+ * not, it will be set to the actual line length (including CRLF).
-+ *
-+ * 'line' in this context means logical line (includes LWS continuations).
-+ * Returns 1 on success, 0 on failure.
-+ */
-+#ifdef NF_NEED_MIME_NEXTLINE
-+static int
-+nf_mime_nextline(char* p, uint len, uint* poff, uint* plineoff, uint* plinelen)
-+{
-+    uint    off = *poff;
-+    uint    physlen = 0;
-+    int     is_first_line = 1;
-+
-+    if (off >= len)
-+    {
-+        return 0;
-+    }
-+
-+    do
-+    {
-+        while (p[off] != '\n')
-+        {
-+            if (len-off <= 1)
-+            {
-+                return 0;
-+            }
-+
-+            physlen++;
-+            off++;
-+        }
-+
-+        /* if we saw a crlf, physlen needs adjusted */
-+        if (physlen > 0 && p[off] == '\n' && p[off-1] == '\r')
-+        {
-+            physlen--;
-+        }
-+
-+        /* advance past the newline */
-+        off++;
-+
-+        /* check for an empty line */
-+        if (physlen == 0)
-+        {
-+            break;
-+        }
-+
-+        /* check for colon on the first physical line */
-+        if (is_first_line)
-+        {
-+            is_first_line = 0;
-+            if (memchr(p+(*poff), ':', physlen) == NULL)
-+            {
-+                return 0;
-+            }
-+        }
-+    }
-+    while (p[off] == ' ' || p[off] == '\t');
-+
-+    *plineoff = *poff;
-+    *plinelen = (physlen == 0) ? 0 : (off - *poff);
-+    *poff = off;
-+
-+    return 1;
-+}
-+#endif /* NF_NEED_MIME_NEXTLINE */
-+
-+#endif /* __KERNEL__ */
-+
-+#endif /* _NETFILTER_MIME_H */
---- a/net/ipv4/netfilter/Makefile
-+++ b/net/ipv4/netfilter/Makefile
-@@ -26,6 +26,7 @@ obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_am
- obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
- obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
- obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
-+obj-$(CONFIG_NF_NAT_RTSP) += nf_nat_rtsp.o
- obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o
- obj-$(CONFIG_NF_NAT_SIP) += nf_nat_sip.o
- obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o
---- a/net/netfilter/Kconfig
-+++ b/net/netfilter/Kconfig
-@@ -267,6 +267,16 @@ config NF_CONNTRACK_TFTP
- 
- 	  To compile it as a module, choose M here.  If unsure, say N.
- 
-+config NF_CONNTRACK_RTSP
-+	tristate "RTSP protocol support"
-+	depends on NF_CONNTRACK
-+	help
-+		Support the RTSP protocol.  This allows UDP transports to be setup
-+		properly, including RTP and RDT.
-+
-+		If you want to compile it as a module, say 'M' here and read
-+		Documentation/modules.txt.  If unsure, say 'Y'.
-+
- config NF_CT_NETLINK
- 	tristate 'Connection tracking netlink interface'
- 	select NETFILTER_NETLINK
---- a/net/netfilter/Makefile
-+++ b/net/netfilter/Makefile
-@@ -33,6 +33,7 @@ obj-$(CONFIG_NF_CONNTRACK_PPTP) += nf_co
- obj-$(CONFIG_NF_CONNTRACK_SANE) += nf_conntrack_sane.o
- obj-$(CONFIG_NF_CONNTRACK_SIP) += nf_conntrack_sip.o
- obj-$(CONFIG_NF_CONNTRACK_TFTP) += nf_conntrack_tftp.o
-+obj-$(CONFIG_NF_CONNTRACK_RTSP) += nf_conntrack_rtsp.o
- 
- # transparent proxy support
- obj-$(CONFIG_NETFILTER_TPROXY) += nf_tproxy_core.o
---- a/net/ipv4/netfilter/Kconfig
-+++ b/net/ipv4/netfilter/Kconfig
-@@ -257,6 +257,11 @@ config NF_NAT_IRC
- 	depends on NF_CONNTRACK && NF_NAT
- 	default NF_NAT && NF_CONNTRACK_IRC
- 
-+config NF_NAT_RTSP
-+	tristate
-+ 	depends on IP_NF_IPTABLES && NF_CONNTRACK && NF_NAT
-+ 	default NF_NAT && NF_CONNTRACK_RTSP
-+
- config NF_NAT_TFTP
- 	tristate
- 	depends on NF_CONNTRACK && NF_NAT
---- /dev/null
-+++ b/net/netfilter/nf_conntrack_rtsp.c
-@@ -0,0 +1,517 @@
-+/*
-+ * RTSP extension for IP connection tracking
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_conntrack_irc.c
-+ *
-+ *      This program is free software; you can redistribute it and/or
-+ *      modify it under the terms of the GNU General Public License
-+ *      as published by the Free Software Foundation; either version
-+ *      2 of the License, or (at your option) any later version.
-+ *
-+ * Module load syntax:
-+ *   insmod nf_conntrack_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ *                              max_outstanding=n setup_timeout=secs
-+ *
-+ * If no ports are specified, the default will be port 554.
-+ *
-+ * With max_outstanding you can define the maximum number of not yet
-+ * answered SETUP requests per RTSP session (default 8).
-+ * With setup_timeout you can specify how long the system waits for
-+ * an expected data channel (default 300 seconds).
-+ *
-+ * 2005-02-13: Harald Welte <laforge at netfilter.org>
-+ * 	- port to 2.6
-+ * 	- update to recent post-2.6.11 api changes
-+ * 2006-09-14: Steven Van Acker <deepstar at singularity.be>
-+ *      - removed calls to NAT code from conntrack helper: NAT no longer needed to use rtsp-conntrack
-+ * 2007-04-18: Michael Guntsche <mike at it-loops.com>
-+ * 			- Port to new NF API
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/netfilter.h>
-+#include <linux/ip.h>
-+#include <linux/inet.h>
-+#include <net/tcp.h>
-+
-+#include <net/netfilter/nf_conntrack.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+#include <net/netfilter/nf_conntrack_helper.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#define NF_NEED_STRTOU32
-+#define NF_NEED_NEXTLINE
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#include <linux/ctype.h>
-+#define MAX_SIMUL_SETUP 8 /* XXX: use max_outstanding */
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS 8
-+static int ports[MAX_PORTS];
-+static int num_ports = 0;
-+static int max_outstanding = 8;
-+static unsigned int setup_timeout = 300;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP connection tracking module");
-+MODULE_LICENSE("GPL");
-+module_param_array(ports, int, &num_ports, 0400);
-+MODULE_PARM_DESC(ports, "port numbers of RTSP servers");
-+module_param(max_outstanding, int, 0400);
-+MODULE_PARM_DESC(max_outstanding, "max number of outstanding SETUP requests per RTSP session");
-+module_param(setup_timeout, int, 0400);
-+MODULE_PARM_DESC(setup_timeout, "timeout on for unestablished data channels");
-+
-+static char *rtsp_buffer;
-+static DEFINE_SPINLOCK(rtsp_buffer_lock);
-+
-+unsigned int (*nf_nat_rtsp_hook)(struct sk_buff *skb,
-+				 enum ip_conntrack_info ctinfo,
-+				 unsigned int matchoff, unsigned int matchlen,struct ip_ct_rtsp_expect* prtspexp,
-+				 struct nf_conntrack_expect *exp);
-+void (*nf_nat_rtsp_hook_expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
-+
-+EXPORT_SYMBOL_GPL(nf_nat_rtsp_hook);
-+
-+/*
-+ * Max mappings we will allow for one RTSP connection (for RTP, the number
-+ * of allocated ports is twice this value).  Note that SMIL burns a lot of
-+ * ports so keep this reasonably high.  If this is too low, you will see a
-+ * lot of "no free client map entries" messages.
-+ */
-+#define MAX_PORT_MAPS 16
-+
-+/*** default port list was here in the masq code: 554, 3030, 4040 ***/
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*
-+ * Parse an RTSP packet.
-+ *
-+ * Returns zero if parsing failed.
-+ *
-+ * Parameters:
-+ *  IN      ptcp        tcp data pointer
-+ *  IN      tcplen      tcp data len
-+ *  IN/OUT  ptcpoff     points to current tcp offset
-+ *  OUT     phdrsoff    set to offset of rtsp headers
-+ *  OUT     phdrslen    set to length of rtsp headers
-+ *  OUT     pcseqoff    set to offset of CSeq header
-+ *  OUT     pcseqlen    set to length of CSeq header
-+ */
-+static int
-+rtsp_parse_message(char* ptcp, uint tcplen, uint* ptcpoff,
-+                   uint* phdrsoff, uint* phdrslen,
-+                   uint* pcseqoff, uint* pcseqlen,
-+                   uint* transoff, uint* translen)
-+{
-+	uint    entitylen = 0;
-+	uint    lineoff;
-+	uint    linelen;
-+
-+	if (!nf_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen))
-+		return 0;
-+
-+	*phdrsoff = *ptcpoff;
-+	while (nf_mime_nextline(ptcp, tcplen, ptcpoff, &lineoff, &linelen)) {
-+		if (linelen == 0) {
-+			if (entitylen > 0)
-+				*ptcpoff += min(entitylen, tcplen - *ptcpoff);
-+			break;
-+		}
-+		if (lineoff+linelen > tcplen) {
-+			INFOP("!! overrun !!\n");
-+			break;
-+		}
-+
-+		if (nf_strncasecmp(ptcp+lineoff, "CSeq:", 5) == 0) {
-+			*pcseqoff = lineoff;
-+			*pcseqlen = linelen;
-+		}
-+
-+		if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0) {
-+			*transoff = lineoff;
-+			*translen = linelen;
-+		}
-+
-+		if (nf_strncasecmp(ptcp+lineoff, "Content-Length:", 15) == 0) {
-+			uint off = lineoff+15;
-+			SKIP_WSPACE(ptcp+lineoff, linelen, off);
-+			nf_strtou32(ptcp+off, &entitylen);
-+		}
-+	}
-+	*phdrslen = (*ptcpoff) - (*phdrsoff);
-+
-+	return 1;
-+}
-+
-+/*
-+ * Find lo/hi client ports (if any) in transport header
-+ * In:
-+ *   ptcp, tcplen = packet
-+ *   tranoff, tranlen = buffer to search
-+ *
-+ * Out:
-+ *   pport_lo, pport_hi = lo/hi ports (host endian)
-+ *
-+ * Returns nonzero if any client ports found
-+ *
-+ * Note: it is valid (and expected) for the client to request multiple
-+ * transports, so we need to parse the entire line.
-+ */
-+static int
-+rtsp_parse_transport(char* ptran, uint tranlen,
-+                     struct ip_ct_rtsp_expect* prtspexp)
-+{
-+	int     rc = 0;
-+	uint    off = 0;
-+
-+	if (tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+	    nf_strncasecmp(ptran, "Transport:", 10) != 0) {
-+		INFOP("sanity check failed\n");
-+		return 0;
-+	}
-+
-+	DEBUGP("tran='%.*s'\n", (int)tranlen, ptran);
-+	off += 10;
-+	SKIP_WSPACE(ptran, tranlen, off);
-+
-+	/* Transport: tran;field;field=val,tran;field;field=val,... */
-+	while (off < tranlen) {
-+		const char* pparamend;
-+		uint        nextparamoff;
-+
-+		pparamend = memchr(ptran+off, ',', tranlen-off);
-+		pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+		nextparamoff = pparamend-ptran;
-+
-+		while (off < nextparamoff) {
-+			const char* pfieldend;
-+			uint        nextfieldoff;
-+
-+			pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+			nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+			if (strncmp(ptran+off, "client_port=", 12) == 0) {
-+				u_int16_t   port;
-+				uint        numlen;
-+
-+				off += 12;
-+				numlen = nf_strtou16(ptran+off, &port);
-+				off += numlen;
-+				if (prtspexp->loport != 0 && prtspexp->loport != port)
-+					DEBUGP("multiple ports found, port %hu ignored\n", port);
-+				else {
-+					DEBUGP("lo port found : %hu\n", port);
-+					prtspexp->loport = prtspexp->hiport = port;
-+					if (ptran[off] == '-') {
-+						off++;
-+						numlen = nf_strtou16(ptran+off, &port);
-+						off += numlen;
-+						prtspexp->pbtype = pb_range;
-+						prtspexp->hiport = port;
-+
-+						// If we have a range, assume rtp:
-+						// loport must be even, hiport must be loport+1
-+						if ((prtspexp->loport & 0x0001) != 0 ||
-+						    prtspexp->hiport != prtspexp->loport+1) {
-+							DEBUGP("incorrect range: %hu-%hu, correcting\n",
-+							       prtspexp->loport, prtspexp->hiport);
-+							prtspexp->loport &= 0xfffe;
-+							prtspexp->hiport = prtspexp->loport+1;
-+						}
-+					} else if (ptran[off] == '/') {
-+						off++;
-+						numlen = nf_strtou16(ptran+off, &port);
-+						off += numlen;
-+						prtspexp->pbtype = pb_discon;
-+						prtspexp->hiport = port;
-+					}
-+					rc = 1;
-+				}
-+			}
-+
-+			/*
-+			 * Note we don't look for the destination parameter here.
-+			 * If we are using NAT, the NAT module will handle it.  If not,
-+			 * and the client is sending packets elsewhere, the expectation
-+			 * will quietly time out.
-+			 */
-+
-+			off = nextfieldoff;
-+		}
-+
-+		off = nextparamoff;
-+	}
-+
-+	return rc;
-+}
-+
-+void expected(struct nf_conn *ct, struct nf_conntrack_expect *exp)
-+{
-+    if(nf_nat_rtsp_hook_expectfn) {
-+        nf_nat_rtsp_hook_expectfn(ct,exp);
-+    }
-+}
-+
-+/*** conntrack functions ***/
-+
-+/* outbound packet: client->server */
-+
-+static inline int
-+help_out(struct sk_buff *skb, unsigned char *rb_ptr, unsigned int datalen,
-+                struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+	struct ip_ct_rtsp_expect expinfo;
-+
-+	int dir = CTINFO2DIR(ctinfo);   /* = IP_CT_DIR_ORIGINAL */
-+	//struct  tcphdr* tcph = (void*)iph + iph->ihl * 4;
-+	//uint    tcplen = pktlen - iph->ihl * 4;
-+	char*   pdata = rb_ptr;
-+	//uint    datalen = tcplen - tcph->doff * 4;
-+	uint    dataoff = 0;
-+	int ret = NF_ACCEPT;
-+
-+	struct nf_conntrack_expect *exp;
-+
-+	__be16 be_loport;
-+
-+	memset(&expinfo, 0, sizeof(expinfo));
-+
-+	while (dataoff < datalen) {
-+		uint    cmdoff = dataoff;
-+		uint    hdrsoff = 0;
-+		uint    hdrslen = 0;
-+		uint    cseqoff = 0;
-+		uint    cseqlen = 0;
-+		uint    transoff = 0;
-+		uint    translen = 0;
-+		uint    off;
-+
-+		if (!rtsp_parse_message(pdata, datalen, &dataoff,
-+					&hdrsoff, &hdrslen,
-+					&cseqoff, &cseqlen,
-+					&transoff, &translen))
-+			break;      /* not a valid message */
-+
-+		if (strncmp(pdata+cmdoff, "SETUP ", 6) != 0)
-+			continue;   /* not a SETUP message */
-+		DEBUGP("found a setup message\n");
-+
-+		off = 0;
-+		if(translen) {
-+			rtsp_parse_transport(pdata+transoff, translen, &expinfo);
-+		}
-+
-+		if (expinfo.loport == 0) {
-+			DEBUGP("no udp transports found\n");
-+			continue;   /* no udp transports found */
-+		}
-+
-+		DEBUGP("udp transport found, ports=(%d,%hu,%hu)\n",
-+		       (int)expinfo.pbtype, expinfo.loport, expinfo.hiport);
-+
-+		exp = nf_ct_expect_alloc(ct);
-+		if (!exp) {
-+			ret = NF_DROP;
-+			goto out;
-+		}
-+
-+		be_loport = htons(expinfo.loport);
-+
-+		nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
-+			ct->tuplehash[!dir].tuple.src.l3num,
-+			&ct->tuplehash[!dir].tuple.src.u3, &ct->tuplehash[!dir].tuple.dst.u3,
-+			IPPROTO_UDP, NULL, &be_loport);
-+
-+		exp->master = ct;
-+
-+		exp->expectfn = expected;
-+		exp->flags = 0;
-+
-+		if (expinfo.pbtype == pb_range) {
-+			DEBUGP("Changing expectation mask to handle multiple ports\n");
-+			exp->mask.src.u.udp.port  = 0xfffe;
-+		}
-+
-+		DEBUGP("expect_related %u.%u.%u.%u:%u-%u.%u.%u.%u:%u\n",
-+		       NIPQUAD(exp->tuple.src.u3.ip),
-+		       ntohs(exp->tuple.src.u.udp.port),
-+		       NIPQUAD(exp->tuple.dst.u3.ip),
-+		       ntohs(exp->tuple.dst.u.udp.port));
-+
-+		if (nf_nat_rtsp_hook)
-+			/* pass the request off to the nat helper */
-+			ret = nf_nat_rtsp_hook(skb, ctinfo, hdrsoff, hdrslen, &expinfo, exp);
-+		else if (nf_ct_expect_related(exp) != 0) {
-+			INFOP("nf_ct_expect_related failed\n");
-+			ret  = NF_DROP;
-+		}
-+		nf_ct_expect_put(exp);
-+		goto out;
-+	}
-+out:
-+
-+	return ret;
-+}
-+
-+
-+static inline int
-+help_in(struct sk_buff *skb, size_t pktlen,
-+ struct nf_conn* ct, enum ip_conntrack_info ctinfo)
-+{
-+ return NF_ACCEPT;
-+}
-+
-+static int help(struct sk_buff *skb, unsigned int protoff,
-+		struct nf_conn *ct, enum ip_conntrack_info ctinfo)
-+{
-+	struct tcphdr _tcph, *th;
-+	unsigned int dataoff, datalen;
-+	char *rb_ptr;
-+	int ret = NF_DROP;
-+
-+	/* 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) {
-+		DEBUGP("conntrackinfo = %u\n", ctinfo);
-+		return NF_ACCEPT;
-+	}
-+
-+	/* Not whole TCP header? */
-+	th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
-+
-+	if (!th)
-+		return NF_ACCEPT;
-+
-+	/* No data ? */
-+	dataoff = protoff + th->doff*4;
-+	datalen = skb->len - dataoff;
-+	if (dataoff >= skb->len)
-+		return NF_ACCEPT;
-+
-+	spin_lock_bh(&rtsp_buffer_lock);
-+	rb_ptr = skb_header_pointer(skb, dataoff,
-+				    skb->len - dataoff, rtsp_buffer);
-+	BUG_ON(rb_ptr == NULL);
-+
-+#if 0
-+	/* Checksum invalid?  Ignore. */
-+	/* FIXME: Source route IP option packets --RR */
-+	if (tcp_v4_check(tcph, tcplen, iph->saddr, iph->daddr,
-+			 csum_partial((char*)tcph, tcplen, 0)))
-+	{
-+		DEBUGP("bad csum: %p %u %u.%u.%u.%u %u.%u.%u.%u\n",
-+		       tcph, tcplen, NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-+		return NF_ACCEPT;
-+	}
-+#endif
-+
-+	switch (CTINFO2DIR(ctinfo)) {
-+	case IP_CT_DIR_ORIGINAL:
-+		ret = help_out(skb, rb_ptr, datalen, ct, ctinfo);
-+		break;
-+	case IP_CT_DIR_REPLY:
-+		DEBUGP("IP_CT_DIR_REPLY\n");
-+		/* inbound packet: server->client */
-+		ret = NF_ACCEPT;
-+		break;
-+	}
-+
-+	spin_unlock_bh(&rtsp_buffer_lock);
-+
-+	return ret;
-+}
-+
-+static struct nf_conntrack_helper rtsp_helpers[MAX_PORTS];
-+static char rtsp_names[MAX_PORTS][10];
-+static struct nf_conntrack_expect_policy rtsp_expect_policy;
-+
-+/* This function is intentionally _NOT_ defined as __exit */
-+static void
-+fini(void)
-+{
-+	int i;
-+	for (i = 0; i < num_ports; i++) {
-+		DEBUGP("unregistering port %d\n", ports[i]);
-+		nf_conntrack_helper_unregister(&rtsp_helpers[i]);
-+	}
-+	kfree(rtsp_buffer);
-+}
-+
-+static int __init
-+init(void)
-+{
-+	int i, ret;
-+	struct nf_conntrack_helper *hlpr;
-+	char *tmpname;
-+
-+	printk("nf_conntrack_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+	if (max_outstanding < 1) {
-+		printk("nf_conntrack_rtsp: max_outstanding must be a positive integer\n");
-+		return -EBUSY;
-+	}
-+	if (setup_timeout < 0) {
-+		printk("nf_conntrack_rtsp: setup_timeout must be a positive integer\n");
-+		return -EBUSY;
-+	}
-+
-+	rtsp_expect_policy.max_expected = max_outstanding;
-+	rtsp_expect_policy.timeout = setup_timeout;
-+
-+	rtsp_buffer = kmalloc(65536, GFP_KERNEL);
-+	if (!rtsp_buffer)
-+		return -ENOMEM;
-+
-+	/* If no port given, default to standard rtsp port */
-+	if (ports[0] == 0) {
-+		ports[0] = RTSP_PORT;
-+	}
-+
-+	for (i = 0; (i < MAX_PORTS) && ports[i]; i++) {
-+		hlpr = &rtsp_helpers[i];
-+		memset(hlpr, 0, sizeof(struct nf_conntrack_helper));
-+		hlpr->tuple.src.u.tcp.port = htons(ports[i]);
-+		hlpr->tuple.dst.protonum = IPPROTO_TCP;
-+		hlpr->expect_policy = &rtsp_expect_policy;
-+		hlpr->me = THIS_MODULE;
-+		hlpr->help = help;
-+
-+		tmpname = &rtsp_names[i][0];
-+		if (ports[i] == RTSP_PORT) {
-+			sprintf(tmpname, "rtsp");
-+		} else {
-+			sprintf(tmpname, "rtsp-%d", i);
-+		}
-+		hlpr->name = tmpname;
-+
-+		DEBUGP("port #%d: %d\n", i, ports[i]);
-+
-+		ret = nf_conntrack_helper_register(hlpr);
-+
-+		if (ret) {
-+			printk("nf_conntrack_rtsp: ERROR registering port %d\n", ports[i]);
-+			fini();
-+			return -EBUSY;
-+		}
-+		num_ports++;
-+	}
-+	return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+
-+EXPORT_SYMBOL(nf_nat_rtsp_hook_expectfn);
-+
---- /dev/null
-+++ b/net/ipv4/netfilter/nf_nat_rtsp.c
-@@ -0,0 +1,496 @@
-+/*
-+ * RTSP extension for TCP NAT alteration
-+ * (C) 2003 by Tom Marshall <tmarshall at real.com>
-+ * based on ip_nat_irc.c
-+ *
-+ *      This program is free software; you can redistribute it and/or
-+ *      modify it under the terms of the GNU General Public License
-+ *      as published by the Free Software Foundation; either version
-+ *      2 of the License, or (at your option) any later version.
-+ *
-+ * Module load syntax:
-+ *      insmod nf_nat_rtsp.o ports=port1,port2,...port<MAX_PORTS>
-+ *                           stunaddr=<address>
-+ *                           destaction=[auto|strip|none]
-+ *
-+ * If no ports are specified, the default will be port 554 only.
-+ *
-+ * stunaddr specifies the address used to detect that a client is using STUN.
-+ * If this address is seen in the destination parameter, it is assumed that
-+ * the client has already punched a UDP hole in the firewall, so we don't
-+ * mangle the client_port.  If none is specified, it is autodetected.  It
-+ * only needs to be set if you have multiple levels of NAT.  It should be
-+ * set to the external address that the STUN clients detect.  Note that in
-+ * this case, it will not be possible for clients to use UDP with servers
-+ * between the NATs.
-+ *
-+ * If no destaction is specified, auto is used.
-+ *   destaction=auto:  strip destination parameter if it is not stunaddr.
-+ *   destaction=strip: always strip destination parameter (not recommended).
-+ *   destaction=none:  do not touch destination parameter (not recommended).
-+ */
-+
-+#include <linux/module.h>
-+#include <net/tcp.h>
-+#include <net/netfilter/nf_nat_helper.h>
-+#include <net/netfilter/nf_nat_rule.h>
-+#include <linux/netfilter/nf_conntrack_rtsp.h>
-+#include <net/netfilter/nf_conntrack_expect.h>
-+
-+#include <linux/inet.h>
-+#include <linux/ctype.h>
-+#define NF_NEED_STRNCASECMP
-+#define NF_NEED_STRTOU16
-+#include <linux/netfilter_helpers.h>
-+#define NF_NEED_MIME_NEXTLINE
-+#include <linux/netfilter_mime.h>
-+
-+#define INFOP(fmt, args...) printk(KERN_INFO "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#if 0
-+#define DEBUGP(fmt, args...) printk(KERN_DEBUG "%s: %s: " fmt, __FILE__, __FUNCTION__ , ## args)
-+#else
-+#define DEBUGP(fmt, args...)
-+#endif
-+
-+#define MAX_PORTS       8
-+#define DSTACT_AUTO     0
-+#define DSTACT_STRIP    1
-+#define DSTACT_NONE     2
-+
-+static char*    stunaddr = NULL;
-+static char*    destaction = NULL;
-+
-+static u_int32_t extip = 0;
-+static int       dstact = 0;
-+
-+MODULE_AUTHOR("Tom Marshall <tmarshall at real.com>");
-+MODULE_DESCRIPTION("RTSP network address translation module");
-+MODULE_LICENSE("GPL");
-+module_param(stunaddr, charp, 0644);
-+MODULE_PARM_DESC(stunaddr, "Address for detecting STUN");
-+module_param(destaction, charp, 0644);
-+MODULE_PARM_DESC(destaction, "Action for destination parameter (auto/strip/none)");
-+
-+#define SKIP_WSPACE(ptr,len,off) while(off < len && isspace(*(ptr+off))) { off++; }
-+
-+/*** helper functions ***/
-+
-+static void
-+get_skb_tcpdata(struct sk_buff* skb, char** pptcpdata, uint* ptcpdatalen)
-+{
-+    struct iphdr*   iph  = ip_hdr(skb);
-+    struct tcphdr*  tcph = (void *)iph + ip_hdrlen(skb);
-+
-+    *pptcpdata = (char*)tcph +  tcph->doff*4;
-+    *ptcpdatalen = ((char*)skb_transport_header(skb) + skb->len) - *pptcpdata;
-+}
-+
-+/*** nat functions ***/
-+
-+/*
-+ * Mangle the "Transport:" header:
-+ *   - Replace all occurences of "client_port=<spec>"
-+ *   - Handle destination parameter
-+ *
-+ * In:
-+ *   ct, ctinfo = conntrack context
-+ *   skb        = packet
-+ *   tranoff    = Transport header offset from TCP data
-+ *   tranlen    = Transport header length (incl. CRLF)
-+ *   rport_lo   = replacement low  port (host endian)
-+ *   rport_hi   = replacement high port (host endian)
-+ *
-+ * Returns packet size difference.
-+ *
-+ * Assumes that a complete transport header is present, ending with CR or LF
-+ */
-+static int
-+rtsp_mangle_tran(enum ip_conntrack_info ctinfo,
-+                 struct nf_conntrack_expect* exp,
-+								 struct ip_ct_rtsp_expect* prtspexp,
-+                 struct sk_buff* skb, uint tranoff, uint tranlen)
-+{
-+    char*       ptcp;
-+    uint        tcplen;
-+    char*       ptran;
-+    char        rbuf1[16];      /* Replacement buffer (one port) */
-+    uint        rbuf1len;       /* Replacement len (one port) */
-+    char        rbufa[16];      /* Replacement buffer (all ports) */
-+    uint        rbufalen;       /* Replacement len (all ports) */
-+    u_int32_t   newip;
-+    u_int16_t   loport, hiport;
-+    uint        off = 0;
-+    uint        diff;           /* Number of bytes we removed */
-+
-+    struct nf_conn *ct = exp->master;
-+    struct nf_conntrack_tuple *t;
-+
-+    char    szextaddr[15+1];
-+    uint    extaddrlen;
-+    int     is_stun;
-+
-+    get_skb_tcpdata(skb, &ptcp, &tcplen);
-+    ptran = ptcp+tranoff;
-+
-+    if (tranoff+tranlen > tcplen || tcplen-tranoff < tranlen ||
-+        tranlen < 10 || !iseol(ptran[tranlen-1]) ||
-+        nf_strncasecmp(ptran, "Transport:", 10) != 0)
-+    {
-+        INFOP("sanity check failed\n");
-+        return 0;
-+    }
-+    off += 10;
-+    SKIP_WSPACE(ptcp+tranoff, tranlen, off);
-+
-+    newip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3.ip;
-+    t = &exp->tuple;
-+    t->dst.u3.ip = newip;
-+
-+    extaddrlen = extip ? sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(extip))
-+                       : sprintf(szextaddr, "%u.%u.%u.%u", NIPQUAD(newip));
-+    DEBUGP("stunaddr=%s (%s)\n", szextaddr, (extip?"forced":"auto"));
-+
-+    rbuf1len = rbufalen = 0;
-+    switch (prtspexp->pbtype)
-+    {
-+    case pb_single:
-+        for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+        {
-+            t->dst.u.udp.port = htons(loport);
-+            if (nf_ct_expect_related(exp) == 0)
-+            {
-+                DEBUGP("using port %hu\n", loport);
-+                break;
-+            }
-+        }
-+        if (loport != 0)
-+        {
-+            rbuf1len = sprintf(rbuf1, "%hu", loport);
-+            rbufalen = sprintf(rbufa, "%hu", loport);
-+        }
-+        break;
-+    case pb_range:
-+        for (loport = prtspexp->loport; loport != 0; loport += 2) /* XXX: improper wrap? */
-+        {
-+            t->dst.u.udp.port = htons(loport);
-+            if (nf_ct_expect_related(exp) == 0)
-+            {
-+                hiport = loport + ~exp->mask.src.u.udp.port;
-+                DEBUGP("using ports %hu-%hu\n", loport, hiport);
-+                break;
-+            }
-+        }
-+        if (loport != 0)
-+        {
-+            rbuf1len = sprintf(rbuf1, "%hu", loport);
-+            rbufalen = sprintf(rbufa, "%hu-%hu", loport, loport+1);
-+        }
-+        break;
-+    case pb_discon:
-+        for (loport = prtspexp->loport; loport != 0; loport++) /* XXX: improper wrap? */
-+        {
-+            t->dst.u.udp.port = htons(loport);
-+            if (nf_ct_expect_related(exp) == 0)
-+            {
-+                DEBUGP("using port %hu (1 of 2)\n", loport);
-+                break;
-+            }
-+        }
-+        for (hiport = prtspexp->hiport; hiport != 0; hiport++) /* XXX: improper wrap? */
-+        {
-+            t->dst.u.udp.port = htons(hiport);
-+            if (nf_ct_expect_related(exp) == 0)
-+            {
-+                DEBUGP("using port %hu (2 of 2)\n", hiport);
-+                break;
-+            }
-+        }
-+        if (loport != 0 && hiport != 0)
-+        {
-+            rbuf1len = sprintf(rbuf1, "%hu", loport);
-+            if (hiport == loport+1)
-+            {
-+                rbufalen = sprintf(rbufa, "%hu-%hu", loport, hiport);
-+            }
-+            else
-+            {
-+                rbufalen = sprintf(rbufa, "%hu/%hu", loport, hiport);
-+            }
-+        }
-+        break;
-+    }
-+
-+    if (rbuf1len == 0)
-+    {
-+        return 0;   /* cannot get replacement port(s) */
-+    }
-+
-+    /* Transport: tran;field;field=val,tran;field;field=val,... */
-+    while (off < tranlen)
-+    {
-+        uint        saveoff;
-+        const char* pparamend;
-+        uint        nextparamoff;
-+
-+        pparamend = memchr(ptran+off, ',', tranlen-off);
-+        pparamend = (pparamend == NULL) ? ptran+tranlen : pparamend+1;
-+        nextparamoff = pparamend-ptcp;
-+
-+        /*
-+         * We pass over each param twice.  On the first pass, we look for a
-+         * destination= field.  It is handled by the security policy.  If it
-+         * is present, allowed, and equal to our external address, we assume
-+         * that STUN is being used and we leave the client_port= field alone.
-+         */
-+        is_stun = 0;
-+        saveoff = off;
-+        while (off < nextparamoff)
-+        {
-+            const char* pfieldend;
-+            uint        nextfieldoff;
-+
-+            pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+            nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+            if (dstact != DSTACT_NONE && strncmp(ptran+off, "destination=", 12) == 0)
-+            {
-+                if (strncmp(ptran+off+12, szextaddr, extaddrlen) == 0)
-+                {
-+                    is_stun = 1;
-+                }
-+                if (dstact == DSTACT_STRIP || (dstact == DSTACT_AUTO && !is_stun))
-+                {
-+                    diff = nextfieldoff-off;
-+                    if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+                                                         off, diff, NULL, 0))
-+                    {
-+                        /* mangle failed, all we can do is bail */
-+			nf_ct_unexpect_related(exp);
-+                        return 0;
-+                    }
-+                    get_skb_tcpdata(skb, &ptcp, &tcplen);
-+                    ptran = ptcp+tranoff;
-+                    tranlen -= diff;
-+                    nextparamoff -= diff;
-+                    nextfieldoff -= diff;
-+                }
-+            }
-+
-+            off = nextfieldoff;
-+        }
-+        if (is_stun)
-+        {
-+            continue;
-+        }
-+        off = saveoff;
-+        while (off < nextparamoff)
-+        {
-+            const char* pfieldend;
-+            uint        nextfieldoff;
-+
-+            pfieldend = memchr(ptran+off, ';', nextparamoff-off);
-+            nextfieldoff = (pfieldend == NULL) ? nextparamoff : pfieldend-ptran+1;
-+
-+            if (strncmp(ptran+off, "client_port=", 12) == 0)
-+            {
-+                u_int16_t   port;
-+                uint        numlen;
-+                uint        origoff;
-+                uint        origlen;
-+                char*       rbuf    = rbuf1;
-+                uint        rbuflen = rbuf1len;
-+
-+                off += 12;
-+                origoff = (ptran-ptcp)+off;
-+                origlen = 0;
-+                numlen = nf_strtou16(ptran+off, &port);
-+                off += numlen;
-+                origlen += numlen;
-+                if (port != prtspexp->loport)
-+                {
-+                    DEBUGP("multiple ports found, port %hu ignored\n", port);
-+                }
-+                else
-+                {
-+                    if (ptran[off] == '-' || ptran[off] == '/')
-+                    {
-+                        off++;
-+                        origlen++;
-+                        numlen = nf_strtou16(ptran+off, &port);
-+                        off += numlen;
-+                        origlen += numlen;
-+                        rbuf = rbufa;
-+                        rbuflen = rbufalen;
-+                    }
-+
-+                    /*
-+                     * note we cannot just memcpy() if the sizes are the same.
-+                     * the mangle function does skb resizing, checks for a
-+                     * cloned skb, and updates the checksums.
-+                     *
-+                     * parameter 4 below is offset from start of tcp data.
-+                     */
-+                    diff = origlen-rbuflen;
-+                    if (!nf_nat_mangle_tcp_packet(skb, ct, ctinfo,
-+                                              origoff, origlen, rbuf, rbuflen))
-+                    {
-+                        /* mangle failed, all we can do is bail */
-+			nf_ct_unexpect_related(exp);
-+                        return 0;
-+                    }
-+                    get_skb_tcpdata(skb, &ptcp, &tcplen);
-+                    ptran = ptcp+tranoff;
-+                    tranlen -= diff;
-+                    nextparamoff -= diff;
-+                    nextfieldoff -= diff;
-+                }
-+            }
-+
-+            off = nextfieldoff;
-+        }
-+
-+        off = nextparamoff;
-+    }
-+
-+    return 1;
-+}
-+
-+static uint
-+help_out(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+	 unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+	 struct nf_conntrack_expect* exp)
-+{
-+    char*   ptcp;
-+    uint    tcplen;
-+    uint    hdrsoff;
-+    uint    hdrslen;
-+    uint    lineoff;
-+    uint    linelen;
-+    uint    off;
-+
-+    //struct iphdr* iph = (struct iphdr*)skb->nh.iph;
-+    //struct tcphdr* tcph = (struct tcphdr*)((void*)iph + iph->ihl*4);
-+
-+    get_skb_tcpdata(skb, &ptcp, &tcplen);
-+    hdrsoff = matchoff;//exp->seq - ntohl(tcph->seq);
-+    hdrslen = matchlen;
-+    off = hdrsoff;
-+    DEBUGP("NAT rtsp help_out\n");
-+
-+    while (nf_mime_nextline(ptcp, hdrsoff+hdrslen, &off, &lineoff, &linelen))
-+    {
-+        if (linelen == 0)
-+        {
-+            break;
-+        }
-+        if (off > hdrsoff+hdrslen)
-+        {
-+            INFOP("!! overrun !!");
-+            break;
-+        }
-+        DEBUGP("hdr: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+
-+        if (nf_strncasecmp(ptcp+lineoff, "Transport:", 10) == 0)
-+        {
-+            uint oldtcplen = tcplen;
-+	    DEBUGP("hdr: Transport\n");
-+            if (!rtsp_mangle_tran(ctinfo, exp, prtspexp, skb, lineoff, linelen))
-+            {
-+		DEBUGP("hdr: Transport mangle failed");
-+                break;
-+            }
-+            get_skb_tcpdata(skb, &ptcp, &tcplen);
-+            hdrslen -= (oldtcplen-tcplen);
-+            off -= (oldtcplen-tcplen);
-+            lineoff -= (oldtcplen-tcplen);
-+            linelen -= (oldtcplen-tcplen);
-+            DEBUGP("rep: len=%u, %.*s", linelen, (int)linelen, ptcp+lineoff);
-+        }
-+    }
-+
-+    return NF_ACCEPT;
-+}
-+
-+static unsigned int
-+help(struct sk_buff *skb, enum ip_conntrack_info ctinfo,
-+     unsigned int matchoff, unsigned int matchlen, struct ip_ct_rtsp_expect* prtspexp,
-+     struct nf_conntrack_expect* exp)
-+{
-+    int dir = CTINFO2DIR(ctinfo);
-+    int rc = NF_ACCEPT;
-+
-+    switch (dir)
-+    {
-+    case IP_CT_DIR_ORIGINAL:
-+        rc = help_out(skb, ctinfo, matchoff, matchlen, prtspexp, exp);
-+        break;
-+    case IP_CT_DIR_REPLY:
-+	DEBUGP("unmangle ! %u\n", ctinfo);
-+    	/* XXX: unmangle */
-+	rc = NF_ACCEPT;
-+        break;
-+    }
-+    //UNLOCK_BH(&ip_rtsp_lock);
-+
-+    return rc;
-+}
-+
-+static void expected(struct nf_conn* ct, struct nf_conntrack_expect *exp)
-+{
-+    struct nf_nat_multi_range_compat mr;
-+    u_int32_t newdstip, newsrcip, newip;
-+
-+    struct nf_conn *master = ct->master;
-+
-+    newdstip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+    newsrcip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
-+    //FIXME (how to port that ?)
-+    //code from 2.4 : newip = (HOOK2MANIP(hooknum) == IP_NAT_MANIP_SRC) ? newsrcip : newdstip;
-+    newip = newdstip;
-+
-+    DEBUGP("newsrcip=%u.%u.%u.%u, newdstip=%u.%u.%u.%u, newip=%u.%u.%u.%u\n",
-+           NIPQUAD(newsrcip), NIPQUAD(newdstip), NIPQUAD(newip));
-+
-+    mr.rangesize = 1;
-+    // We don't want to manip the per-protocol, just the IPs.
-+    mr.range[0].flags = IP_NAT_RANGE_MAP_IPS;
-+    mr.range[0].min_ip = mr.range[0].max_ip = newip;
-+
-+    nf_nat_setup_info(ct, &mr.range[0], IP_NAT_MANIP_DST);
-+}
-+
-+
-+static void __exit fini(void)
-+{
-+	nf_nat_rtsp_hook = NULL;
-+        nf_nat_rtsp_hook_expectfn = NULL;
-+	synchronize_net();
-+}
-+
-+static int __init init(void)
-+{
-+	printk("nf_nat_rtsp v" IP_NF_RTSP_VERSION " loading\n");
-+
-+	BUG_ON(nf_nat_rtsp_hook);
-+	nf_nat_rtsp_hook = help;
-+        nf_nat_rtsp_hook_expectfn = &expected;
-+
-+	if (stunaddr != NULL)
-+		extip = in_aton(stunaddr);
-+
-+	if (destaction != NULL) {
-+	        if (strcmp(destaction, "auto") == 0)
-+			dstact = DSTACT_AUTO;
-+
-+		if (strcmp(destaction, "strip") == 0)
-+			dstact = DSTACT_STRIP;
-+
-+		if (strcmp(destaction, "none") == 0)
-+			dstact = DSTACT_NONE;
-+	}
-+
-+	return 0;
-+}
-+
-+module_init(init);
-+module_exit(fini);