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authorEric Dumazet <eric.dumazet@gmail.com>2011-08-30 03:21:44 +0000
committerDavid S. Miller <davem@davemloft.net>2011-09-15 14:49:43 -0400
commit946cedccbd7387488d2cee5da92cdfeb28d2e670 (patch)
treefbb0d9c8dc11d6efee64e2a077a4951831932058 /include/linux
parent27e95a8c670e0c587990ec5b9a87a7ea17873d28 (diff)
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/snmp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 12b2b18e50c1..e16557a357e5 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -231,6 +231,8 @@ enum
LINUX_MIB_TCPDEFERACCEPTDROP,
LINUX_MIB_IPRPFILTER, /* IP Reverse Path Filter (rp_filter) */
LINUX_MIB_TCPTIMEWAITOVERFLOW, /* TCPTimeWaitOverflow */
+ LINUX_MIB_TCPREQQFULLDOCOOKIES, /* TCPReqQFullDoCookies */
+ LINUX_MIB_TCPREQQFULLDROP, /* TCPReqQFullDrop */
__LINUX_MIB_MAX
};