https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2944
Summary: LLC GPRS - "Unnumbered Information" should be
"Unconfirmed Information"
Product: Wireshark
Version: 1.0.3
Platform: PC
OS/Version: Windows 2000
Status: NEW
Severity: Minor
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: khaithye@xxxxxxxxxxxx
Created an attachment (id=2322)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=2322)
Example of a GPRS LLC UI frame
Build Information:
Shark 1.0.3 (SVN Rev 26134)
Copyright 1998-2008 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 with GLib 2.14.6, with WinPcap (version unknown), with libz 1.2.3,
without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8, with ADNS, with
Lua 5.1, with GnuTLS 2.3.8, with Gcrypt 1.4.1, with MIT Kerberos.
Running on Windows 2000 Service Pack 4, build 2195, with WinPcap version 4.0.2
(packet.dll version 4.0.0.1040), based on libpcap version 0.9.5.
Built using Microsoft Visual C++ 6.0 build 8804
--
In the decoding of GPRS LLC layer, the UI format is erroneously decoded as
"Unnumbered Information", but according to ETSI 04.64, it should be
"Unconfirmed Information". The term "unnumbered" is misleading, because there
is an N(U) in this layer for UI format (so, it's actually numbered).
Following is an example:
MS-SGSN LLC (Mobile Station - Serving GPRS Support Node Logical Link Control)
SAPI: GPRS Mobility Management
FCS: 0x21c14e (correct)
Address field SAPI: LLGMM
0... .... = Protocol Discriminator_bit: OK
.0.. .... = Command/Response bit: DownLink/UpLink = Response/Command
.... 0001 = SAPI: GPRS Mobility Management (1)
Unnumbered Information format - UI, N(U) = 0
110. .... .... .... = UI format: 0x0006
...0 0... .... .... = Spare bits: 0x0000
.... .000 0000 00.. = N(U): 0
.... .... .... ..0. = E bit: non encrypted frame
.... .... .... ...1 = PM bit: FCS covers the frame header and
information fields
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