Wireshark-dev: Re: [Wireshark-dev] Idea for faster dissection on second pas
From: Michael Tuexen <[email protected]>
Date: Thu, 10 Oct 2013 22:27:30 +0200
On Oct 10, 2013, at 10:22 PM, Anders Broman <[email protected]> wrote:

> Hi,
> If we in the UDP/TCP/(SCTP?) dissectors saved next dissector on the first pas in say per packet data we could avoid
> repeated calls to heuristic dissectors and port/conversation lookups making the second pas faster.
> Does any one see any pitfalls with this idea?
> I can think of two ways of implementing it:
> - A new entry in pinfo "previous protocol" or something like that.
> or
> - make dissector_try_uint(), dissector_try_heuristic(), try_conversation_dissector() return the protocol
> or NULL;
> The second is perhaps cleaner but requires more changes or we could make new functions
> dissector_try_heuristic_ret_proto() etc or something like that.
> Comments?
SCTP might have multiple "next dissectors", one for each data chunk...

Best regards
> Regards
> Anders
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