Wireshark-bugs: [Wireshark-bugs] [Bug 10576] New: IPv6 Mobility Option IPv6 Address/Prefix marks
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 16 Oct 2014 09:13:36 +0000
Bug ID 10576
Summary IPv6 Mobility Option IPv6 Address/Prefix marks too many bytes for the address/prefix field
Product Wireshark
Version 1.12.1
Hardware x86-64
OS Windows 7
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter boaz.brickner@gmail.com 

Created attachment 13173 [details]
An example IPv6 packet with IPv6 Address/Prefix mobility option

Build Information:
Version 1.12.1 (v1.12.1-0-g01b65bf from master-1.12)

Copyright 1998-2014 Gerald Combs <gerald@wireshark.org> 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 (64-bit) with GTK+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, without Python, with GnuTLS 3.1.22, with Gcrypt 1.6.0,
without Kerberos, with GeoIP, with PortAudio V19-devel (built Sep 16 2014),
with
AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.1.22, Gcrypt 1.6.0, without AirPcap.
        Intel(R) Core(TM) i5-3550 CPU @ 3.30GHz, with 16345MB of physical
memory.


Built using Microsoft Visual C++ 10.0 build 40219

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
Discovered while working on Pcap.Net (http://pcapdot.net).

In the attached pcap file there's a single IPv6 packet with Mobility Options.
One of the mobility options is the IPv6 Address/Prefix.
The prefix length of this option is 52.
Note that according to RFC 5568, the prefix length is in bits and not in bytes.
The IPv6 Address/Prefix field of this option marks 52 bytes.

In addition, I'm not sure that the IPv6 Address/Prefix field is a variable size
field.
RFC 5568 section 6.4.2 has a diagram of this options that shows this field as
if it always takes 128 bits, and the prefix length field just says the length
of the prefix (not the length of the field).
This is at least how I understand the RFC.

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