Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 5246] New: [NAS EPS] Use Request Type IE defined in 3GPP 24.008

[bugzilla-daemon@xxxxxxxxxxxxx]

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5246

           Summary: [NAS EPS] Use Request Type IE defined in 3GPP 24.008
           Product: Wireshark
           Version: 1.5.x (Experimental)
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: pascal.quantin@xxxxxxxxx


Pascal Quantin <pascal.quantin@xxxxxxxxx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #5195|                            |review_for_checkin?
               Flag|                            |

Created an attachment (id=5195)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=5195)
Request Type IE decoding factorization

Build Information:
Version 1.5.0 (SVN Rev 34178 from /trunk)

Copyright 1998-2010 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 GTK+ 2.12.12, (32-bit) with GLib 2.16.6, with libpcap 1.0.0, with
libz 1.2.3.3, without POSIX capabilities, without libpcre, without SMI, without
c-ares, without ADNS, without Lua, without Python, with GnuTLS 2.4.2, with
Gcrypt 1.4.1, with MIT Kerberos, without GeoIP, without PortAudio, without
AirPcap.

Running on Linux 2.6.26-2-686-bigmem, with libpcap version 1.0.0, with libz
1.2.3.3, GnuTLS 2.4.2, Gcrypt 1.4.1.

Built using gcc 4.3.2.

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

Check the man page and http://www.wireshark.org for more information.
--
Right now, a EPS Attach Request message is decoded as:
Non-Access-Stratum (NAS)PDU
    0000 .... = Security header type: Plain NAS message, not security protected
(0)
    .... 0111 = Protocol discriminator: EPS mobility management messages (7)
    NAS EPS Mobility Management Message Type: Attach request (0x41)
    0... .... = Type of security context flag (TSC): Native security context
(0)
    .111 .... = NAS key set identifier: No key is available (7)
    .... 0... = Spare bit(s): 0x00
    .... .001 = EPS attach type: EPS attach (1)
    EPS mobile identity - Old GUTI or IMSI
        Length: 8
        .... 1... = odd/even indic: 1
        .... .001 = Type of identity: IMSI (1)
        IMSI: 460000200003113
    UE network capability
        Length: 2
        1... .... = EEA0: Supported
        .1.. .... = 128-EEA1: Supported
        ..1. .... = 128-EEA2: Supported
        ...0 .... = EEA3: Not Supported
        .... 0... = EEA4: Not Supported
        .... .0.. = EEA5: Not Supported
        .... ..0. = EEA6: Not Supported
        .... ...0 = EEA7: Not Supported
        1... .... = EIA0: Supported
        .1.. .... = 128-EIA1: Supported
        ..1. .... = 128-EIA2: Supported
        ...0 .... = EIA3: Not Supported
        .... 0... = EIA4: Not Supported
        .... .0.. = EIA5: Not Supported
        .... ..0. = EIA6: Not Supported
        .... ...0 = EIA7: Not Supported
    ESM message container
        Length: 26
        ESM message container contents:
0201d0112714808021100100001081060000000083060000...
            0000 .... = EPS bearer identity: 0x00
            .... 0010 = Protocol discriminator: EPS session management messages
(2)
            Procedure transaction identity: 1
            NAS EPS session management messages: PDN connectivity request
(0xd0)
            0001 .... = PDN type: IPv4 (1)
            .... 0001 = Request type: Initial attach (1)
            Protocol Configuration Options
                Element ID: 39
                Length: 20
                1... .... = Ext: 0x01
                Configuration Protocol: PPP (0)
                Protocol: IP Control Protocol (32801)
                Length: 0x10 (16)
                PPP IP Control Protocol
                    Code: Configuration Request (0x01)
                    Identifier: 0x00
                    Length: 16
                    Options: (12 bytes)
                        Primary DNS server IP address: 0.0.0.0
                        Secondary DNS server IP address: 0.0.0.0

Note that the Request Type IE in the PDN Connectivity Request piggybacked
message is decoded as "Initial attach".

According to 3GPP 24.301 8.6.0 chapter 9.9.4.14, the Request Type IE should be
decoded as in 3GPP TS 24.008 chapter 10.5.6.17.

The attached patch use the corresponding dissection function in
packet-gsm_a_gm.c file. It also adds a missing dissection of Request Type in
the 2G/3G Activate PDP Context Request message.
Once applied, you get:
Non-Access-Stratum (NAS)PDU
    0000 .... = Security header type: Plain NAS message, not security protected
(0)
    .... 0111 = Protocol discriminator: EPS mobility management messages (7)
    NAS EPS Mobility Management Message Type: Attach request (0x41)
    0... .... = Type of security context flag (TSC): Native security context
(0)
    .111 .... = NAS key set identifier: No key is available (7)
    .... 0... = Spare bit(s): 0x00
    .... .001 = EPS attach type: EPS attach (1)
    EPS mobile identity - Old GUTI or IMSI
        Length: 8
        .... 1... = odd/even indic: 1
        .... .001 = Type of identity: IMSI (1)
        IMSI: 460000200003113
    UE network capability
        Length: 2
        1... .... = EEA0: Supported
        .1.. .... = 128-EEA1: Supported
        ..1. .... = 128-EEA2: Supported
        ...0 .... = EEA3: Not Supported
        .... 0... = EEA4: Not Supported
        .... .0.. = EEA5: Not Supported
        .... ..0. = EEA6: Not Supported
        .... ...0 = EEA7: Not Supported
        1... .... = EIA0: Supported
        .1.. .... = 128-EIA1: Supported
        ..1. .... = 128-EIA2: Supported
        ...0 .... = EIA3: Not Supported
        .... 0... = EIA4: Not Supported
        .... .0.. = EIA5: Not Supported
        .... ..0. = EIA6: Not Supported
        .... ...0 = EIA7: Not Supported
    ESM message container
        Length: 26
        ESM message container contents:
0201d0112714808021100100001081060000000083060000...
            0000 .... = EPS bearer identity: 0x00
            .... 0010 = Protocol discriminator: EPS session management messages
(2)
            Procedure transaction identity: 1
            NAS EPS session management messages: PDN connectivity request
(0xd0)
            0001 .... = PDN type: IPv4 (1)
            .... 0... = Spare bit(s): 0
            .... .001 = Request type: Initial request (1)
            Protocol Configuration Options
                Element ID: 39
                Length: 20
                1... .... = Ext: 0x01
                Configuration Protocol: PPP (0)
                Protocol: IP Control Protocol (32801)
                Length: 0x10 (16)
                PPP IP Control Protocol
                    Code: Configuration Request (0x01)
                    Identifier: 0x00
                    Length: 16
                    Options: (12 bytes)
                        Primary DNS server IP address: 0.0.0.0
                        Secondary DNS server IP address: 0.0.0.0

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