netdev - Re: SCTP research inquiry

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Message-ID: <54077D97.9060608@gmail.com>
Date:	Wed, 03 Sep 2014 16:44:07 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Kostantinos Katsaros <dinos.katsaros@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: SCTP research inquiry

On 09/03/2014 01:07 PM, Kostantinos Katsaros wrote:
> 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.

Are you looking for user-space API that provide the information you need?
The reason I ask is that all I've seen of dce requires you to have
an posix-like application to run on top of the protocol you want to use.
I don't know if DCE allows you directly call linux kernel functions.

Based on the above answer, I can point you more resources.

-vlad

> 
> - 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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