From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: netdev@vger.kernel.org, kkiran@broadcom.com
Subject: Re: [PATCH net-next v2] tcp: implement RFC 5961 3.2
Date: Tue, 17 Jul 2012 01:36:34 -0700 (PDT) [thread overview]
Message-ID: <20120717.013634.138750003911972637.davem@davemloft.net> (raw)
In-Reply-To: <1342512785.2626.230.camel@edumazet-glaptop>
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 17 Jul 2012 10:13:05 +0200
> From: Eric Dumazet <edumazet@google.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@google.com>
Looks good, applied, thanks Eric.
prev parent reply other threads:[~2012-07-17 8:36 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-17 8:13 [PATCH net-next v2] tcp: implement RFC 5961 3.2 Eric Dumazet
2012-07-17 8:36 ` David Miller [this message]
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