netdev - Re: [PATCH net-next v2] tcp: implement RFC 5961 3.2

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Message-Id: <20120717.013634.138750003911972637.davem@davemloft.net>
Date:	Tue, 17 Jul 2012 01:36:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, kkiran@...adcom.com
Subject: Re: [PATCH net-next v2] tcp: implement RFC 5961 3.2

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 17 Jul 2012 10:13:05 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Implement the RFC 5691 mitigation against Blind
> Reset attack using RST bit.
> 
> Idea is to validate incoming RST sequence,
> to match RCV.NXT value, instead of previouly accepted
> window : (RCV.NXT <= SEG.SEQ < RCV.NXT+RCV.WND)
> 
> If sequence is in window but not an exact match, send
> a "challenge ACK", so that the other part can resend an
> RST with the appropriate sequence.
> 
> Add a new sysctl, tcp_challenge_ack_limit, to limit
> number of challenge ACK sent per second.
> 
> Add a new SNMP counter to count number of challenge acks sent.
> (netstat -s | grep TCPChallengeACK)
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Looks good, applied, thanks Eric.
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