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

[David Miller]

From: Andrew Vagin <avagin@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
> Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
> Cc: James Morris <jmorris@xxxxxxxxx>
> Cc: Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>
> Cc: Patrick McHardy <kaber@xxxxxxxxx>
> CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> Signed-off-by: Andrew Vagin <avagin@xxxxxxxxxx>

Applied, thanks.
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