--- gvpe/src/device.h	2003/10/14 17:06:21	1.9
+++ gvpe/src/device.h	2003/10/16 21:12:43	1.14
@@ -1,5 +1,6 @@
 /*
     device.h -- generic header for device.c
+    Copyright (C) 2003 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
@@ -24,6 +25,7 @@
 #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;