netdev - Re: [PATCH net-next 2/2] net_sched: sfq: always randomize hash perturbation

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Message-Id: <20120104.141307.215742763480818454.davem@davemloft.net>
Date:	Wed, 04 Jan 2012 14:13:07 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] net_sched: sfq: always randomize hash
 perturbation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 04 Jan 2012 17:23:01 +0100

> SFQ q->perturbation is used in sfq_hash() as an input to Jenkins hash.
> 
> We currently randomize this 32bit value only if a perturbation timer is
> setup.
> 
> Its much better to always initialize it to defeat attackers, or else
> they can predict very well what kind of packets they have to forge to
> hit a particular flow.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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