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tcp: Change possible SYN flooding messages

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"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>
This commit is contained in:
Eric Dumazet
2011-08-30 03:21:44 +00:00
committed by David S. Miller
parent 27e95a8c67
commit 946cedccbd
6 changed files with 40 additions and 50 deletions
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3
include/net/request_sock.h
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@@ -96,7 +96,8 @@ extern int sysctl_max_syn_backlog;
*/
struct listen_sock {
u8 max_qlen_log;
/* 3 bytes hole, try to use */
u8 synflood_warned;
/* 2 bytes hole, try to use */
int qlen;
int qlen_young;
int clock_hand;