Wireshark-bugs: [Wireshark-bugs] [Bug 7355] New: Showing IPv6 Hdr Ext Length instead of the full
Date: Sun, 10 Jun 2012 17:45:55 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7355

           Summary: Showing IPv6 Hdr Ext Length instead of the full length
                    of the extension header
           Product: Wireshark
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Dissection engine (libwireshark)
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Created attachment 8580
  --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8580
Packet capture with several IPv6 extension headers

Build Information:
TShark 1.9.0 (SVN Rev 43187 from /trunk)

Copyright 1998-2012 Gerald Combs <[email protected]> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (32-bit) with GLib 2.30.3, with libpcap, with libz 1.2.5, without
POSIX
capabilities, without SMI, without c-ares, without ADNS, without Lua, without
Python, without GnuTLS, without Gcrypt, without Kerberos, without GeoIP.

Running on Linux 3.3.7-1.fc16.i686, with locale en_US.UTF-8, with libpcap
version 1.1.1, with libz 1.2.5.

Built using gcc 4.6.3 20120306 (Red Hat 4.6.3-2).
--
The 'Hdr Ext Len' field present in many of the IPv6 Extension Headers is stated
in RFC 2460 to indicate the length of the header excluding the first 8 octets. 
As currently implemented, though, this field is being displayed as a field
named 'Length' that indicates the full length of the header (including the
first 8 octets.)  It seems like it should be changed so that it is consistent
with the RFC.

This affects the currently implemented dissection of the Hop-by-Hop Options
Header, Routing Header, Shim6 Control Header (RFC5533) and in the case of an
unrecognized header type.

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