netdev - Re: [PATCH net] tcp: don't include Fast Open option in SYN-ACK on pure SYN-data

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Message-Id: <20150209.142732.243638519161010259.davem@redhat.com>
Date:	Mon, 09 Feb 2015 14:27:32 -0800 (PST)
From:	David Miller <davem@...hat.com>
To:	ycheng@...gle.com
Cc:	edumazet@...gle.com, ncardwell@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] tcp: don't include Fast Open option in SYN-ACK on
 pure SYN-data

From: Yuchung Cheng <ycheng@...gle.com>
Date: Mon,  9 Feb 2015 12:35:23 -0800

> If a server has enabled Fast Open and it receives a pure SYN-data
> packet (without a Fast Open option), it won't accept the data but it
> incorrectly returns a SYN-ACK with a Fast Open cookie and also
> increments the SNMP stat LINUX_MIB_TCPFASTOPENPASSIVEFAIL.
> 
> This patch makes the server include a Fast Open cookie in SYN-ACK
> only if the SYN has some Fast Open option (i.e., when client
> requests or presents a cookie).
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Acked-by: Neal Cardwell <ncardwell@...gle.com>
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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