netdev - Re: [PATCH] ipv6: use a stronger hash for tcp

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Message-ID: <20130222001453.GC9671@order.stressinduktion.org>
Date:	Fri, 22 Feb 2013 01:14:53 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
	netdev@...r.kernel.org, ncardwell@...gle.com, ycheng@...gle.com
Subject: Re: [PATCH] ipv6: use a stronger hash for tcp

On Thu, Feb 21, 2013 at 03:49:16PM -0800, Andi Kleen wrote:
> David Miller <davem@...emloft.net> writes:
> >
> > I bet we can consolidate this slightly, to make it less
> > expensive yet not give up much in terms of protection.  Two
> > jhash3word()'s is quite a lot.
> 
> jhash is not really the state of the art for general hashing anymore,
> murmur3 or cityhash are generally considered faster/possibly better.

murmur3 and cityhash are broken in terms of collision resistance.  I have
not heard anything about jenkins being affected (but have not searched
either). SipHash is a relativly new hash function specifically designed
to protect against hashdos, but I fear it could be more expansive for very
small inputs: https://131002.net/siphash/

Greetings,

  Hannes

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