[MEDIUM] import ip_tproxy.h from cttproxy

The file "ip_tproxy.h" will be needed to build with cttproxy support.
Let's include it to ease the build process.

include/import/ip_tproxy.h

@@ -0,0 +1,77 @@
+/*
+ * Transparent proxy support for Linux/iptables
+ *
+ * Copyright (c) 2002-2004 BalaBit IT Ltd.
+ * Author: Balázs Scheidler
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef _IP_TPROXY_H
+#define _IP_TPROXY_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <linux/in.h>
+#else
+#include <netinet/in.h>
+#ifndef IP_RECVORIGADDRS
+#define IP_RECVORIGADDRS	11273
+#define IP_ORIGADDRS	IP_RECVORIGADDRS
+struct in_origaddrs {
+        struct in_addr ioa_srcaddr;
+        struct in_addr ioa_dstaddr;
+        unsigned short int ioa_srcport;
+        unsigned short int ioa_dstport;
+};
+#endif
+#endif
+
+/* 
+ * used in setsockopt(SOL_IP, IP_TPROXY) should not collide 
+ * with values in <linux/in.h> 
+ */
+
+#define IP_TPROXY	   11274
+
+/* tproxy operations */
+enum {
+	TPROXY_VERSION = 0,
+	TPROXY_ASSIGN,
+	TPROXY_UNASSIGN,
+	TPROXY_QUERY,
+	TPROXY_FLAGS,
+	TPROXY_ALLOC,
+	TPROXY_CONNECT
+};
+
+/* bitfields in IP_TPROXY_FLAGS */
+#define ITP_CONNECT     0x00000001
+#define ITP_LISTEN      0x00000002
+#define ITP_ESTABLISHED 0x00000004
+
+#define ITP_ONCE        0x00010000
+#define ITP_MARK        0x00020000
+#define ITP_APPLIED     0x00040000
+#define ITP_UNIDIR      0x00080000
+
+struct in_tproxy_addr{
+	struct in_addr	faddr;
+	u_int16_t	fport;
+};
+
+struct in_tproxy {
+	/* fixed part, should not change between versions */
+	u_int32_t op;
+	/* extensible part */
+	union _in_args {
+		u_int32_t		version;
+		struct in_tproxy_addr	addr;
+		u_int32_t		flags;
+	} v;
+};
+
+#endif