Wireshark-bugs: [Wireshark-bugs] [Bug 10673] IPv6 RPL Routing Header calculates Full Address fie
Comment # 3
on bug 10673
from João Valverde
(In reply to boaz.brickner from comment #2)
> (In reply to João Valverde from comment #1)
> > (In reply to boaz.brickner from comment #0)
> > > 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.
> >
> > I'm not sure that's true. I think RFC 6554 assumes (correctly) that there
> > won't be more than one routing header present so it uses "IPv6 destination
> > address" to mean "final destination of whatever weird combination of routing
> > headers precedes it".
>
> What is the "final destination of whatever weird combination of routing
> headers precedes it" in the given example?
In this case it's the Home Address. Because that's what the mobile node will
see in the IPv6 Destination Address field when it actually gets to process the
RPL routing header.
In the general case it's the final destination address of the routing header
immediately preceding the current one.
Also the Type 2 routing header segments left field must be 1 (Wireshark should
report this).
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