From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 30 Aug 2011 03:21:44 +0000 (+0000)
Subject: tcp: Change possible SYN flooding messages
X-Git-Tag: v3.1-rc7~25^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=946cedccbd7387488d2cee5da92cdfeb28d2e670;p=pandora-kernel.git

tcp: Change possible SYN flooding messages

"Possible SYN flooding on port xxxx " messages can fill logs on servers.

Change logic to log the message only once per listener, and add two new
SNMP counters to track :

TCPReqQFullDoCookies : number of times a SYNCOOKIE was replied to client

TCPReqQFullDrop : number of times a SYN request was dropped because
syncookies were not enabled.

Based on a prior patch from Tom Herbert, and suggestions from David.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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