Wireshark-dev: Re: [Wireshark-dev] [PATCH] Support ALCAP, NBAP over SSCOP in K12xx
On 1/27/07, Kriang Lerdsuwanakij <lerdsuwa@xxxxxxxxxxxxxxxxxxxxx> wrote:
With above 3 changes together, dissecting Iub traces are correct for
control and signaling planes. I am still investigating user plane
frames because writing UMTS RLC/MAC protocol dissector is required.
.
Hi Kriang,
This is very interesting to me.
I wrote the FP dissector to work with Catapult DCT2000 log files, which for me are often user-plane only tests without NBAP or ALCAP traffic. The dissector relies upon per-frame information being available (see struct _fp_info from packet-umts_fp.h). For DCT2000, this information is stored separately for each frame, and attached to the packet before the FP dissector will be called. If the same information is not available with K12xx, it could also be made to alternatively look up some global tables or conversation data created by the NBAP or ALCAP dissectors.
I tried to make the info in the struct as general as possible - I plan to replace 'dct2000_variant' with a sub-version number (e.g. 7 for release 6.7.0), and also to add an 'interface' field to specify IuB or IuR.
I have not considered trying to dissect the MAC and RLC headers within the FP TBs. This would be hard because you would need to know all of their configuration details and effectively to simulate those layers and the primitives exchanged between them. For me, just having Wireshark's filtering and graphing available for the FP layer has already been *very* useful.
Good luck,
Martin
