netdev - Re: Missing TCP SYN on loopback, retransmits after 1s

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Message-Id: <20111123.172959.909786536317740314.davem@davemloft.net>
Date:	Wed, 23 Nov 2011 17:29:59 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	jlyo@...o.org, netdev@...r.kernel.org
Subject: Re: Missing TCP SYN on loopback, retransmits after 1s

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 23 Nov 2011 15:38:44 +0100

> [PATCH] ipv6: tcp: fix tcp_v6_conn_request()
> 
> Since linux 2.6.26 (commit c6aefafb7ec6 : Add IPv6 support to TCP SYN
> cookies), we can drop a SYN packet reusing a TIME_WAIT socket.
> 
> (As a matter of fact we fail to send the SYNACK answer)
> 
> As the client resends its SYN packet after a one second timeout, we
> accept it, because first packet removed the TIME_WAIT socket before
> being dropped.
> 
> This probably explains why nobody ever noticed or complained.
> 
> Reported-by: Jesse Young <jlyo@...o.org>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied and queued up for -stable, thanks!
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