--- gvpe/src/device.h	2003/04/08 02:00:54	1.5
+++ gvpe/src/device.h	2004/01/17 01:18:36	1.15
@@ -1,5 +1,6 @@
 /*
     device.h -- generic header for device.c
+    Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
  
     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
@@ -19,11 +20,12 @@
 #ifndef VPE_DEVICE_H__
 #define VPE_DEVICE_H__
 
-#include <net/if.h>
+#define IFNAMESIZE 256 // be conservative
 
 #include "gettext.h"
 
 #include "global.h"
+#include "util.h"
 
 struct net_packet {
   u32 len; // actually u16, but padding...
@@ -48,7 +50,23 @@
       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
@@ -70,8 +88,6 @@
   return ((data_packet *)this)->data_[offset];
 }
 
-typedef u8 mac[6];
-
 struct tap_packet : net_packet {
   mac dst;
   mac src;
@@ -81,20 +97,25 @@
 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