ATM raw format data-link level type code in dump

[Miguel Casas-Sanchez <miguel.casas-sanchez () alcatel-lucent com>]

Hi all,

I have been messing around with data dumps into libpcap file format 
(major=2, minor=4) for testing my traffic generation scripts, and so far 
it went very good: I could create different streams, dump them into 
file(s), and parse them back using either windump/tcpdump/wireshark.

Now I'm generating ATM cells with AAL5 encapsulated traffic inside (as 
per RFC 2684, not RFC 1483 which is superseded) and cannot seem to find 
the appropriate DLT_ for "raw atm".

There are, in pcap/bpf.h, the following related DLT modes:

   #define DLT_ATM_RFC1483    11    /* LLC-encapsulated ATM */
   #define DLT_ATM_CLIP           19    /* Linux Classical-IP over ATM */
   #define DLT_SUNATM            123    /* Solaris+SunATM */

   DLT_ATM_RFC1483 expects the "packet data" in the dump file, to be 
stripped of the atm cell header, and most likely of the AAL5 epilog.

   DLT_ATM_CLIP expects the "packet data" in the dump file, to be only 
an IP packet, so basically is the same as the previous case.

   DLT_SUNATM expects another type of format for "packet data": 1 byte 
of traffic type indication, 1 byte VPI and 2-byte VCI, then the atm cell 
payload.


I would like to know if anyone implemented/had though about adding a 
DLT_ATM_RAW or similar, to dump raw ATM cells as they come from the 
network. If necessary/interesting I could add them myself.

Cheers

Miguel

--
-----------------------------------------------------------------------------
Miguel Casas-Sanchez
Alcatel-Lucent Bell NV
Embedded Software Engineer (JA52)
Copernicuslaan 50, 2018 ANTWERP, BELGIUM
(+32) 3 2403851

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