Wireshark-dev: Re: [Wireshark-dev] 3GPP RLC and MAC protocols support
Date: 09-Jan-2008 10:42:42 ZE5B


Hi,
My requirement is basically the whole stack (no ciphering for the time
being).
   RRC
   RLC
   MAC
   FP
   UDP

Could you pls share the details of the approach you took with FP. What kind
of "filled-in-struct", and how it can be filled from NBAP configuration
messages.
For RLC/MAC also, I am more interested in a generalised solution (approach
(b)), where configuration info can be gleaned from RRC messages, and filled
in a "filled-in-struct".

Regards,
Munish



                                                                           
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                                       Re: [Wireshark-dev] 3GPP RLC and    
                                       MAC protocols support               
             01/09/2008 12:19                                              
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On Jan 8, 2008 6:05 PM, Neil Piercy <[email protected]> wrote:
  I'm looking at the same issue for my company and came to similar
  conclusion. At present we've gone down the route of (c) for a quick try,
  but I think it will soon be coming unstuck - it certainly isn't general
  enough to feed back yet.  We haven't yet got any MAC/RLC dissection, but
  would be happy to work with somebody to do so - even if we only leave the
  glue to transports as proprietary for now.


If it were to be done, I'd like to use the approach as I took with FP,
where a filled-in-struct is attached to each frame with the info the
dissector needs to know.  As you say, this can be filled in from wherever
it is available or can be guessed.

I'd be interested in discussing what these fields should be if you like..
The FP dissector has been very useful to me - I'm not convinced that MAC
and RLC would be as useful to me (one reason is that we have separate
primitives/frames for the messages exchanged between the layers, so its not
obvious how I'd be able to associate the frames and show the whole stack,
i.e.

RLC
MAC
FP
UDP or AAL

in one Wireshark frame.  Ciphering is another complication.

Regards,
Martin




  BTW is anyone planning on hooking RRC NAS message IEs into gsm_a_dtap ?
  Since RRC is from the ASN.1, I've not tried it yet, but any pointers
  appreciated.

  Neil

  From: [email protected] [mailto:
  [email protected]] On Behalf Of Martin Mathieson
  Sent: 08 January 2008 11:26

  To: Developer support list for Wireshark
  Subject: Re: [Wireshark-dev] 3GPP RLC and MAC protocols support

  Hi,
  I don't know of anyone working on MAC or RLC dissectors.

  FP is currently only available for Catapult DCT2000 and Tektronix K12
  file formats, since those formats include the information needed to
  interpret the message payloads.  This amounts to using Wireshark as a
  different log viewer, rather than as a passive network analyser.

  In order to decode the MAC and RLC layers, you'd need to either:
  (a) use a file format that gives you this information directly (as
  above), OR
  (b) infer the FP/MAC/RLC layer configuration/state using information
  gleaned from RRC configuration messages, OR MAYBE
  (c) guess from the message size/timing/contents that common transport
  formats have been used, e.g. there are standard settings using with AMR
  co-ordinated channels? OR EVEN LESS LIKELY
  (d) get all of this information from preference settings.  I think this
  is probably a non-starter since so much of the information is per-channel
  or even per-frame.

  I'd love to see someone do this, but know that it isn't trivial - my
  company (Catapult) built such an analyser (using (b) - before I joined).

  I could have extended the approach of (a) for the DCT2000 format, i.e.
  dissect our own proprietary primitive headers then use this and other
  information in the file format to hand off to pure MAC or RLC dissectors
  (that would use attached information, as the FP dissector does), but this
  would still just be using Wireshark as a different log viewer, I don't
  know of any other file formats that would then be able to take advantage
  of these dissectors in the same way (possibly K12 again...).  I believe
  the headers for MAC and RLC are quite short, and that it would take more
  effort to dissect the proprietary headers than it would for the actual
  protocol headers.

  Regards,
  Martin

  On Jan 8, 2008 10:41 AM, Anders Broman <[email protected]>
  wrote:
    Hi,
    An RRC dissector (packet-rrc.c) exists but only partly used. Some time
    ago some one
    asked about MAC and probably did something with it but nothing was
    commited back to WS.
    These are somewhere in the middle of the tread
    http://www.wireshark.org/lists/wireshark-dev/200708/msg00121.html
    http://www.wireshark.org/lists/wireshark-dev/200708/msg00275.html
    Regards
    Anders

    -----Original Message-----
    From: [email protected]
    [mailto:[email protected] ] On Behalf Of
    [email protected]
    Sent: den 8 januari 2008 15:35
    To: Developer support list for Wireshark
    Subject: [Wireshark-dev] 3GPP RLC and MAC protocols support





    Hi,

    Is anybody working on dissectors for 3GPP-UMTS- RLC and MAC protocols ?

    Or are these dissectors already available somewhere ?

    Thanks & Regards,
    Munish





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