X-Git-Url: http://g0dil.de/git?a=blobdiff_plain;f=Packets%2FDefaultBundle%2FUDPPacket.cc;h=f3cfc56eb353e10fb5718d42e8bb1ac9c0423f92;hb=3863d46dd898b7bc35ea8c6ccd8563b18762a6b6;hp=20b07ca193d1f8f5903eee72cc9838bf694bdaee;hpb=a1001797645cc68c869ef296f5e9ba13aa8e80c4;p=senf.git

diff --git a/Packets/DefaultBundle/UDPPacket.cc b/Packets/DefaultBundle/UDPPacket.cc
index 20b07ca..f3cfc56 100644
--- a/Packets/DefaultBundle/UDPPacket.cc
+++ b/Packets/DefaultBundle/UDPPacket.cc
@@ -1,9 +1,9 @@
 // $Id$
 //
 // Copyright (C) 2006
-// Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
-// Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
-//     Stefan Bund <stefan.bund@fokus.fraunhofer.de>
+// Fraunhofer Institute for Open Communication Systems (FOKUS)
+// Competence Center NETwork research (NET), St. Augustin, GERMANY
+//     Stefan Bund <g0dil@berlios.de>
 //
 // 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
@@ -50,15 +50,12 @@ prefix_ boost::uint16_t senf::UDPPacketParser::calcChecksum()
     const
 {
     IpChecksum summer;
-    summer.feed( i(), i()+checksum_offset );
-    summer.feed( i()+checksum_offset+2, data().end() );
-    
-    // Now on to the awkward part: the IP pseudo header
-    IPv4Packet ipv4 (packet().prev<IPv4Packet>(nothrow));
+    // first on to the awkward part: the IP pseudo header
+    IPv4Packet ipv4 (packet().rfind<IPv4Packet>(nothrow));
     if (ipv4) {
         // Pseudo header defined in RFC768
         summer.feed( ipv4->source().i(), 
-                     ipv4->source().i() + IPv4PacketParser::source_t::fixed_bytes );
+                     ipv4->source().i() + IPv4Packet::Parser::source_t::fixed_bytes );
         ///\fixme What about a hop-by-hop routing option? Which destination is used in IPv4 ?
         summer.feed( ipv4->destination().i(), 
                      ipv4->destination().i() + IPv4PacketParser::destination_t::fixed_bytes );
@@ -70,16 +67,16 @@ prefix_ boost::uint16_t senf::UDPPacketParser::calcChecksum()
     } 
     else {
         // Pseudo header defined in RFC2460
-        IPv6Packet ipv6 (packet().prev<IPv6Packet>(nothrow));
+        IPv6Packet ipv6 (packet().rfind<IPv6Packet>(nothrow));
         if (ipv6) {
             summer.feed( ipv6->source().i(), 
-                         ipv6->source().i() + IPv6PacketParser::source_t::fixed_bytes );
+                         ipv6->source().i() + IPv6Packet::Parser::source_t::fixed_bytes );
             ///\todo Implement routing header support
             // The destination used here must be the *final* destination ...
             summer.feed( ipv6->destination().i(), 
                          ipv6->destination().i() + IPv6PacketParser::destination_t::fixed_bytes );
-            /// This is a simplification. The value is really 32bit to support UDP Jumbograms
-            /// (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
+            // This is a simplification. The value is really 32bit to support UDP Jumbograms
+            // (RFC2147). However, skipping an even number of 0 bytes does not change the checksum
             summer.feed( i() + length_offset, i() + length_offset + 2 );
             // RFC2460 specifies, that this must always be 17, not the value used in the ipv6
             // header
@@ -88,6 +85,11 @@ prefix_ boost::uint16_t senf::UDPPacketParser::calcChecksum()
         }
     }
     
+    // since header are 16 / even 32bit aligned we don't have to care for padding. since IpChecksum 
+    // cares for padding at the final summing we don't have to care is the payload is 16nbit-aligned, too.
+    summer.feed( i(), i()+checksum_offset );
+    summer.feed( i()+checksum_offset+2, data().end() );
+
     boost::uint16_t rv (summer.sum());
     return rv ? rv : 0xffffu;
 }