From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 9 Feb 2015 20:35:23 +0000 (-0800)
Subject: tcp: don't include Fast Open option in SYN-ACK on pure SYN-data
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~134^2~3^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=531c94a9681b8c253fd0490a4ca8bbe01a38c78b;p=pandora-kernel.git

tcp: don't include Fast Open option in SYN-ACK on pure SYN-data

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@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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