netdev - Re: [PATCH 3/4] sctp: Fix to handle SHUTDOWN in SHUTDOWN-PENDING state

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Message-Id: <20081023.010058.31323273.davem@davemloft.net>
Date:	Thu, 23 Oct 2008 01:00:58 -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 3/4] sctp: Fix to handle SHUTDOWN in SHUTDOWN-PENDING
 state

From: Vlad Yasevich <vladislav.yasevich@...com>
Date: Tue, 21 Oct 2008 22:08:46 -0400

> If SHUTDOWN is received in SHUTDOWN-PENDING state, enpoint should enter
> the SHUTDOWN-RECEIVED state and check the Cumulative TSN Ack field of
> the SHUTDOWN chunk (RFC 4960 Section 9.2). If the SHUTDOWN chunk can
> acknowledge all of the send DATA chunks, SHUTDOWN-ACK should be sent.
> 
> But now endpoint just silently discarded the SHUTDOWN chunk.
> 
> SHUTDOWN received in SHUTDOWN-PENDING state can happend when the last
> SACK is lost by network, or the SHUTDOWN chunk can acknowledge all of
> the received DATA chunks. The packet sequence(SACK lost) is like this:
> 
> Endpoint A                       Endpoint B       ULP
> (ESTABLISHED)                    (ESTABLISHED)
> 
>                <-----------      DATA
>                                              <--- shutdown
>                                  Enter SHUTDOWN-PENDING state
>   SACK         ----lost---->
> 
>   SHUTDOWN(*1) ------------>
> 
>                <-----------      SHUTDOWN-ACK
> 
>  (*1) silently discarded now.
> 
> This patch fix to handle SHUTDOWN in SHUTDOWN-PENDING state as the same
> as ESTABLISHED state.
> 
> Signed-off-by: Wei Yongjun <yjwei@...fujitsu.com>
> Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>

Applied.
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