From 96e0bf4b5193d0d97d139f99e2dd128763d55521 Mon Sep 17 00:00:00 2001
From: John Dykstra <john.dykstra1@gmail.com>
Date: Sun, 22 Mar 2009 21:49:57 -0700
Subject: [PATCH] tcp: Discard segments that ack data not yet sent

Discard incoming packets whose ack field iincludes data not yet sent.
This is consistent with RFC 793 Section 3.9.

Change tcp_ack() to distinguish between too-small and too-large ack
field values.  Keep segments with too-large ack fields out of the fast
path, and change slow path to discard them.

Reported-by:  Oliver Zheng <mailinglists+netdev@oliverzheng.com>
Signed-off-by: John Dykstra <john.dykstra1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Reading git-format-patch failed