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

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Date:	Thu, 20 Sep 2012 13:31:57 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	Andrew Vagin <avagin@...nvz.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] tcp: restore rcv_wscale in a repair mode (v2)

On 09/19/2012 11:40 PM, Andrew Vagin wrote:
> 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>

Acked-by: Pavel Emelyanov <xemul@...allels.com>

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