Wireshark-bugs: [Wireshark-bugs] [Bug 6880] New: GTP Extension Header seems not interpreted inco
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 28 Feb 2012 05:34:49 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6880

           Summary: GTP Extension Header seems not interpreted incorrectly
           Product: Wireshark
           Version: 1.6.5
          Platform: x86
        OS/Version: Windows 7
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: praseethks@xxxxxxxxx


Created attachment 7910
  --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=7910
Wireshark Screen Capture

Build Information:
Version 1.6.5 (SVN Rev 40429 from /trunk-1.6)

Copyright 1998-2012 Gerald Combs <gerald@xxxxxxxxxxxxx> 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 GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Jan
10 2012), with AirPcap.

Running on 32-bit Windows 7, build 7600, with WinPcap version 4.1.2 (packet.dll
version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b (20091008),
GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022

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

Check the man page and http://www.wireshark.org for more information.
--

This is packet in LTE network from S-GW to eNB. The GTP extension header
doesn't seem to be interpreted correctly. 
Within the GTP header, the last byte is C0 - Next extension header type (PDCP
PDU)
C0 01 09 04 00 

Next extension header type: PDCP PDU number (C0) ---> correct here
Point-to-Point Protocol
  Protocol: Unknown (0xc001)  ----------------------> seems incorrect

The interpretation would be:

01 - length in 4 octets 
0904 - PDCP PDU number
00 - Next Extension header type, 0 meaning none


Reference: 3GPP TS 29.060 V7.1.0 (2006-03)
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Core Network and Terminals;
General Packet Radio Service (GPRS);
GPRS Tunnelling Protocol (GTP)
across the Gn and Gp interface
(Release 7)

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