https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=10576
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-ad...@wireshark.org Reporter: boaz.brick...@gmail.com Created attachment 13173 --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=13173&action=edit 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 <ger...@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. -- You are receiving this mail because: You are watching all bug changes.
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