--- gvpe/src/device.h	2003/04/06 20:01:52	1.4
+++ gvpe/src/device.h	2005/03/18 01:53:05	1.18
@@ -1,7 +1,10 @@
 /*
     device.h -- generic header for device.c
+    Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
  
-    This program is free software; you can redistribute it and/or modify
+    This file is part of GVPE.
+
+    GVPE 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.
@@ -12,27 +15,36 @@
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
+    along with gvpe; if not, write to the Free Software
     Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
-#ifndef VPE_DEVICE_H__
-#define VPE_DEVICE_H__
+#ifndef GVPE_DEVICE_H__
+#define GVPE_DEVICE_H__
 
-#include <net/if.h>
+#include "config.h"
 
-#include "gettext.h"
+#define IFNAMESIZE 256 // be conservative
 
 #include "global.h"
+#include "util.h"
 
 struct net_packet {
   u32 len; // actually u16, but padding...
 
   u8 &operator[] (u16 offset) const;
+  u8 *at (u16 offset) const;
+
+  void unshift_hdr (u16 hdrsize)
+    {
+      memmove ((void *)&(*this)[hdrsize], (void *)&(*this)[0], len);
+      len += hdrsize;
+    }
 
   void skip_hdr (u16 hdrsize)
     {
-      memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len -= hdrsize);
+      len -= hdrsize;
+      memmove ((void *)&(*this)[0], (void *)&(*this)[hdrsize], len);
     }
 
   void set (const net_packet &pkt)
@@ -41,7 +53,23 @@
       memcpy (&((*this)[0]), &(pkt[0]), len);
     }
 
-  bool is_arp ()
+  bool is_ipv4 () const
+    {
+      return (*this)[12] == 0x08 && (*this)[13] == 0x00 // IP
+          && ((*this)[14] & 0xf0) == 0x40;              // IPv4
+    }
+
+  u32 &ipv4_src () const
+    {
+      return *(u32 *)&(*this)[26];
+    }
+  
+  u32 &ipv4_dst () const
+    {
+      return *(u32 *)&(*this)[30];
+    }
+  
+  bool is_arp () const
     {
       return (*this)[12] == 0x08 && (*this)[13] == 0x06		// 0806 protocol
           && (*this)[14] == 0x00 && (*this)[15] == 0x01		// 0001 hw_format
@@ -63,7 +91,11 @@
   return ((data_packet *)this)->data_[offset];
 }
 
-typedef u8 mac[6];
+inline 
+u8 *net_packet::at (u16 offset) const
+{
+  return &((*this)[offset]);
+}
 
 struct tap_packet : net_packet {
   mac dst;
@@ -74,20 +106,25 @@
 struct tap_device {
   int fd;
 
-  // linux tuntap
-  char ifrname[IFNAMSIZ + 1];
+  // network interface name or identifier
+  char ifrname[IFNAMESIZE + 1];
 
   char *device;
 
   tap_device ();
   ~tap_device ();
 
+  //bool open ();
+  //void close ();
+
   const char *interface () { return ifrname; }
-  const char *info () { return _("Linux tun/tap device"); }
+  const char *info ();
 
   tap_packet *recv ();
   void send (tap_packet *pkt);
 };
 
+//extern tap_device *tap_device ();
+
 #endif