From 0c24604b68fc7810d429d6c3657b6f148270e528 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 17 Jul 2012 01:41:30 +0000 Subject: tcp: implement RFC 5961 4.2 Implement the RFC 5691 mitigation against Blind Reset attack using SYN bit. Section 4.2 of RFC 5961 advises to send a Challenge ACK and drop incoming packet, instead of resetting the session. Add a new SNMP counter to count number of challenge acks sent in response to SYN packets. (netstat -s | grep TCPSYNChallenge) Remove obsolete TCPAbortOnSyn, since we no longer abort a TCP session because of a SYN flag. Signed-off-by: Eric Dumazet Cc: Kiran Kumar Kella Signed-off-by: David S. Miller --- include/linux/snmp.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/snmp.h') diff --git a/include/linux/snmp.h b/include/linux/snmp.h index 673e0e928b2b..e5fcbd079e4a 100644 --- a/include/linux/snmp.h +++ b/include/linux/snmp.h @@ -208,7 +208,6 @@ enum LINUX_MIB_TCPDSACKOFOSENT, /* TCPDSACKOfoSent */ LINUX_MIB_TCPDSACKRECV, /* TCPDSACKRecv */ LINUX_MIB_TCPDSACKOFORECV, /* TCPDSACKOfoRecv */ - LINUX_MIB_TCPABORTONSYN, /* TCPAbortOnSyn */ LINUX_MIB_TCPABORTONDATA, /* TCPAbortOnData */ LINUX_MIB_TCPABORTONCLOSE, /* TCPAbortOnClose */ LINUX_MIB_TCPABORTONMEMORY, /* TCPAbortOnMemory */ @@ -238,6 +237,7 @@ enum LINUX_MIB_TCPOFODROP, /* TCPOFODrop */ LINUX_MIB_TCPOFOMERGE, /* TCPOFOMerge */ LINUX_MIB_TCPCHALLENGEACK, /* TCPChallengeACK */ + LINUX_MIB_TCPSYNCHALLENGE, /* TCPSYNChallenge */ __LINUX_MIB_MAX }; -- cgit v1.2.3