From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next] tcp: implement RFC 5961 4.2 Date: Tue, 17 Jul 2012 07:41:01 -0700 (PDT) Message-ID: <20120717.074101.134339589368651253.davem@davemloft.net> References: <1342525290.2626.459.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, kkiran@broadcom.com To: eric.dumazet@gmail.com Return-path: Received: from shards.monkeyblade.net ([149.20.54.216]:50504 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752593Ab2GQOlC (ORCPT ); Tue, 17 Jul 2012 10:41:02 -0400 In-Reply-To: <1342525290.2626.459.camel@edumazet-glaptop> Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet Date: Tue, 17 Jul 2012 13:41:30 +0200 > From: Eric Dumazet > > 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 Looks good, applied, thanks Eric.