netdev - Re: updates to syncookies - timestamps not needed any more (freebsd)

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Message-Id: <20130712.163720.1878859530623469256.davem@redhat.com>
Date:	Fri, 12 Jul 2013 16:37:20 -0700 (PDT)
From:	David Miller <davem@...hat.com>
To:	eric.dumazet@...il.com
Cc:	fw@...len.de, hannes@...essinduktion.org, netdev@...r.kernel.org
Subject: Re: updates to syncookies - timestamps not needed any more
 (freebsd)

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 12 Jul 2013 07:32:43 -0700

> Another quick hack would be to allow sack being generated by the client.
> 
> If we receive sackOK in SYN, then syncookie SYNACK could contain sackOK,
> if timestamps are not used.
> 
> Client would be allowed to use SACK in his ACK. Server would not
> generate SACK, but would process incoming SACK.
> 
> Not sure what could break ?

This seems quite clumsy and would result in being able to use SACK only
in one direction.

There has to be a better way.
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