tree fbb0d9c8dc11d6efee64e2a077a4951831932058
parent 27e95a8c670e0c587990ec5b9a87a7ea17873d28
author Eric Dumazet <eric.dumazet@gmail.com> 1314674504 +0000
committer David S. Miller <davem@davemloft.net> 1316112583 -0400

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>