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Date:	Thu, 23 Oct 2008 01:00:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vladislav.yasevich@...com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	yjwei@...fujitsu.com
Subject: Re: [PATCH 2/4] sctp: Add check for the TSN field of the SHUTDOWN
 chunk

From: Vlad Yasevich <vladislav.yasevich@...com>
Date: Tue, 21 Oct 2008 22:08:45 -0400

> If SHUTDOWN chunk is received Cumulative TSN Ack beyond the max tsn currently
> send, SHUTDOWN chunk be accepted and the association will be broken. New data
> is send, but after received SACK it will be drop because TSN in SACK is less
> than the Cumulative TSN, data will be retrans again and again even if correct
> SACK is received.
> 
> The packet sequence is like this:
> 
> Endpoint A                       Endpoint B       ULP
> (ESTABLISHED)                    (ESTABLISHED)
> 
>                <-----------      DATA (TSN=x-1)
> 
>                <-----------      DATA (TSN=x)
> 
>   SHUTDOWN     ----------->      (Now Cumulative TSN=x+1000)
>   (TSN=x+1000)
>                <-----------      DATA (TSN=x+1)
> 
>   SACK         ----------->      drop the SACK
>   (TSN=x+1)
>                <-----------      DATA (TSN=x+1)(retrans)
> 
> This patch fix this problem by terminating the association and respond to
> the sender with an ABORT.
> 
> Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
> Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>

Applied.
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