netdev - Re: [PATCH net-next] tcp/dccp: fix behavior of stale SYN

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Message-Id: <20151013.182758.307245280925758827.davem@davemloft.net>
Date:	Tue, 13 Oct 2015 18:27:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp/dccp: fix behavior of stale SYN_RECV
 request sockets

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 13 Oct 2015 17:12:54 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> When a TCP/DCCP listener is closed, its pending SYN_RECV request sockets
> become stale, meaning 3WHS can not complete.
> 
> But current behavior is wrong :
> incoming packets finding such stale sockets are dropped.
> 
> We need instead to cleanup the request socket and perform another
> lookup :
> - Incoming ACK will give a RST answer,
> - SYN rtx might find another listener if available.
> - We expedite cleanup of request sockets and old listener socket.
> 
> Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.
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