diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-07-17 01:41:30 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-11 09:07:15 -0800 |
| commit | d21383fcbb535f90b429279852988d675ed22d67 (patch) | |
| tree | 7f395982de610bfc355082ae351deb01a19a5060 /include | |
| parent | 34fb350281ced2a72707a5c0064f69992d440edb (diff) | |
tcp: implement RFC 5961 4.2
[ Upstream commit 0c24604b68fc7810d429d6c3657b6f148270e528 ]
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 <edumazet@google.com>
Cc: Kiran Kumar Kella <kkiran@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/snmp.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/snmp.h b/include/linux/snmp.h index 594638ec5acf..a33f70fa1bfd 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 */ @@ -235,6 +234,7 @@ enum LINUX_MIB_TCPRETRANSFAIL, /* TCPRetransFail */ LINUX_MIB_TCPRCVCOALESCE, /* TCPRcvCoalesce */ LINUX_MIB_TCPCHALLENGEACK, /* TCPChallengeACK */ + LINUX_MIB_TCPSYNCHALLENGE, /* TCPSYNChallenge */ __LINUX_MIB_MAX }; |