Re: Request for new DLT

[Pascal Quantin <pascal.quantin () gmail com>]

Hi Michael,

2013/5/18 Michael Richardson <mcr () sandelman ca>

> > > > > > "Pascal" == Pascal Quantin <pascal.quantin () gmail com> writes:
>     Pascal> Anders Broman, Wireshark core developer, is currently
> designing an export
>     Pascal> functionality for PDUs and would need a DLT allocated for this
> new
>     Pascal> functionality.
>     Pascal> You will find below the email he tried to send to this mailing
> list a few
>     Pascal> days ago and that got bounced. I hope mine will go through
>     Pascal> :)
>
> sorry.
>
>     Anders>  I would need a DLT for a wrapper around higher level PDU's or
> per-packet
>     Anders> DLT:s the format is multipurpose and consists of a number of
> TLV:s
>     Anders> proceeding the actual PDU.
>     Anders> There are TLV:s which describes which protocol the PDU is and
> meta data
>     Anders> such as IP address and port (if the transport protocol(s) are
> striped off).
>
>     Anders> The format can be used by logging functions in various nodes,
> say after
>     Anders> deserialization(SS7 over TDM) decryption(GSM/UMTS/LTE Nodes?)
> etc.
>     Anders> Tag values and an outline of the format can be found here
>     Anders>
> http://anonsvn.wireshark.org/viewvc/trunk/epan/exported_pdu.h?revision=49285&view=markup
>
> Looks like a rather sane TLV structure.
> Is it intended to be used beyond SS7 stuff?


Anders can describe it better than me, but the format intends to be
versatile.It allows you to export any higher level PDUs in a pcap file
while maintaining some basic information about the lower layers (like the
transport one). The current code sample in Wireshark is for SIP protocol,
but could be extended to any protocol if there is a need. With a DLT
allocated, it would allow the feature to work out of the box without any
user configuration required (right now the implementation is mapped on a
user DLT, so you must configure Wireshark accordingly).
For example I would see a use for it for the logging capabilities of a
mobile phone that use higher layer protocols decoded by Wireshark without
the traditional network oriented transport layers. Right now I need to play
tricks with user DLT and it prevents mixing protocols.

Regards,
Pascal.
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