Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 10673] New: IPv6 RPL Routing Header calculates Full Address fields using Mobil

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Bug ID	10673
Summary	IPv6 RPL Routing Header calculates Full Address fields using Mobile IP's Home Address instead of the IPv6's Destination address
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 13237 [details]
IPv6 RPL Routing Header with Mobile IP Routing Header

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 that includes a few
extension headers.
The first extension header is a Mobile IP Routing Header, with Home Address
7df4:9a44:d165:c90c:906a:2d2d:4632:1f72.
The second extension header is a an RPL Routing Header, with CmprI = 2.
According to RFC 6554, this means that the first two octets of the non-last
addresses in the RPL Routing Header should come from the IPv6 destination
address (e48f:ce5:4065:25d4:bbb0:114a:e6bc:5c8a), so it should take e48f.

"
A common network configuration for a RPL routing domain is that all
routers within a RPL routing domain share a common prefix.  The SRH
introduces the CmprI, CmprE, and Pad fields to allow compaction of
the Address[1..n] vector when all entries share the same prefix as
the IPv6 Destination Address field of the packet carrying the SRH.
The CmprI and CmprE fields indicate the number of prefix octets that
are shared with the IPv6 Destination Address of the packet carrying
the SRH.  The shared prefix octets are not carried within the Routing
header and each entry in Address[1..n-1] has size (16 - CmprI) octets
and Address[n] has size (16 - CmprE) octets.  When CmprI or CmprE is
non-zero, there may exist unused octets between the last entry,
Address[n], and the end of the Routing header.  The Pad field
indicates the number of unused octets that are used for padding.
Note that when CmprI and CmprE are both 0, Pad MUST carry a value of
0.
"

However, when Wireshark calculates the the RPL's Full Address field, it takes
the first two octets from the Mobile IP's Home Address field, so it takes 7df4
instead of e48f.

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