Add code to check the checksums of TCP segments and UDP datagrams;

replace the existing checksummer with a modified version of the BSD
checksumming code.  Add a flag to the "packet_info" structure to
indicate that a packet is the first fragment of a fragmented datagram,
so that the checksummers won't try to checksum those.

(It doesn't seem to add a lot of CPU overhead, so we don't introduce a
flag to disable it, yet.  Further checks may be necessary to see whether
the overhead is just swamped by other overheads when scanning through a
capture dissecting all frames, or if it truly is negligible.)

Make the Boolean preference option controlling whether to make the
top-level protocol tree item for TCP display a packet summary static to
the TCP dissector (it doesn't need to be accessible outside the TCP
dissector).

svn path=/trunk/; revision=2751

1 files changed, 3 insertions, 2 deletions

diff --git a/epan/packet.h b/epan/packet.h
index 745b4a3cdf..dff25a94ad 100644
--- a/epan/packet.h
+++ b/epan/packet.h
@@ -1,7 +1,7 @@
 /* packet.h
  * Definitions for packet disassembly structures and routines
  *
- * $Id: packet.h,v 1.14 2000/12/04 06:37:46 guy Exp $
+ * $Id: packet.h,v 1.15 2000/12/13 02:24:23 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -170,7 +170,8 @@ typedef struct _packet_info {
   address net_dst;		/* network-layer destination address */
   address src;			/* source address (net if present, DL otherwise )*/
   address dst;			/* destination address (net if present, DL otherwise )*/
-  guint32 ipproto;
+  guint32 ipproto;		/* IP protocol, if this is an IP packet */
+  gboolean fragmented;		/* TRUE if the protocol is only a fragment */
   port_type ptype;		/* type of the following two port numbers */
   guint32 srcport;		/* source port */
   guint32 destport;		/* destination port */