linux-kernel - Re: [PATCH] tcp: restore rcv_wscale in a repair mode (v2)

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Date:	Thu, 20 Sep 2012 17:50:34 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	avagin@...nvz.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, xemul@...allels.com
Subject: Re: [PATCH] tcp: restore rcv_wscale in a repair mode (v2)

From: Andrew Vagin <avagin@...nvz.org>
Date: Wed, 19 Sep 2012 23:40:00 +0400

> rcv_wscale is a symetric parameter with snd_wscale.
> 
> Both this parameters are set on a connection handshake.
> 
> Without this value a remote window size can not be interpreted correctly,
> because a value from a packet should be shifted on rcv_wscale.
> 
> And one more thing is that wscale_ok should be set too.
> 
> This patch doesn't break a backward compatibility.
> If someone uses it in a old scheme, a rcv window
> will be restored with the same bug (rcv_wscale = 0).
> 
> v2: Save backward compatibility on big-endian system. Before
>     the first two bytes were snd_wscale and the second two bytes were
>     rcv_wscale. Now snd_wscale is opt_val & 0xFFFF and rcv_wscale >> 16.
>     This approach is independent on byte ordering.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
> Cc: Patrick McHardy <kaber@...sh.net>
> CC: Pavel Emelyanov <xemul@...allels.com>
> Signed-off-by: Andrew Vagin <avagin@...nvz.org>

Applied, thanks.
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