netdev - Re: [PATCH net-next] tcp: RFC 5961 5.2 Blind Data Injection Attack Mitigation

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Message-Id: <20121022.151131.792891680432322007.davem@davemloft.net>
Date:	Mon, 22 Oct 2012 15:11:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ncardwell@...gle.com, ycheng@...gle.com,
	hkchu@...gle.com
Subject: Re: [PATCH net-next] tcp: RFC 5961 5.2 Blind Data Injection Attack
 Mitigation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 22 Oct 2012 07:57:11 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> RFC 5961 5.2 [Blind Data Injection Attack].[Mitigation]
> 
>   All TCP stacks MAY implement the following mitigation.  TCP stacks
>   that implement this mitigation MUST add an additional input check to
>   any incoming segment.  The ACK value is considered acceptable only if
>   it is in the range of ((SND.UNA - MAX.SND.WND) <= SEG.ACK <=
>   SND.NXT).  All incoming segments whose ACK value doesn't satisfy the
>   above condition MUST be discarded and an ACK sent back.
> 
> Move tcp_send_challenge_ack() before tcp_ack() to avoid a forward
> declaration.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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