linux-kernel - Re: [PATCH] tcp: don't apply tsoffset if rcv

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Message-Id: <20130829.151213.1901946252095108600.davem@davemloft.net>
Date:	Thu, 29 Aug 2013 15:12:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	avagin@...nvz.org
Cc:	netdev@...r.kernel.org, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, xemul@...allels.com,
	eric.dumazet@...il.com, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] tcp: don't apply tsoffset if rcv_tsecr is zero

From: Andrey Vagin <avagin@...nvz.org>
Date: Tue, 27 Aug 2013 12:21:55 +0400

> From: Andrew Vagin <avagin@...nvz.org>
> 
> The zero value means that tsecr is not valid, so it's a special case.
> 
> tsoffset is used to customize tcp_time_stamp for one socket.
> tsoffset is usually zero, it's used when a socket was moved from one
> host to another host.
> 
> Currently this issue affects logic of tcp_rcv_rtt_measure_ts. Due to
> incorrect value of rcv_tsecr, tcp_rcv_rtt_measure_ts sets rto to
> TCP_RTO_MAX.
> 
> Reported-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> Signed-off-by: Andrey Vagin <avagin@...nvz.org>

Applied and queued up for -stable.
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