netdev - SCTP research inquiry

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Date:	Wed, 3 Sep 2014 18:07:30 +0100
From:	Kostantinos Katsaros <dinos.katsaros@...il.com>
To:	netdev <netdev@...r.kernel.org>
Subject: SCTP research inquiry

Dear NetDev list,

I am a researcher from Univ. of Surrey. I know that this list is
mainly for developers of linux-kernel but I want to ask for some help
to understand the SCTP implementation and pointers to some aspects.

What I would actually like to do, is to modify the default SCTP
operation with respect to primary/secondary interface selection and
analyse it in simulations with NS-3. However, I haven't found an API
or some other help and I was advised to contact this list. I know that
NS-3 is capable of using linux-kernel implementations through the use
of DCE, but my issue here is in the SCTP implementation.

There a few questions I have in a basic scenario with two nodes
connected via 2 interfaces.

- How can I dynamically select which of the two interfaces is primary?
Which method is responsible or should be called to switch?

- I guess that SCTP has some variable holding the estimated RTT on
each path (also used for calculating RTO). Is this accessible and how?
I would like to use this as a triggering mechanism to the switch
method above. In principle select the path with the minimum RTT.

- In a similar way of TCP Westwood (Plus), I would like to estimate
the available bandwidth and use this as trigger.

- Finally, I want to monitor the ratio (packets or bytes sent) on each
of the available paths. How can I implement such mechanism? Do I have
to implement a 'sniffer'?

I would appreciate any help, pointers, code snippets.

Regards,

Kostas
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