netdev - Re: [PATCH RFC] ipv6: use stronger hash for reassembly queue hash table

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Message-ID: <20130308150831.GD28531@order.stressinduktion.org>
Date:	Fri, 8 Mar 2013 16:08:31 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH RFC] ipv6: use stronger hash for reassembly queue hash table

On Fri, Mar 08, 2013 at 06:53:06AM -0800, Eric Dumazet wrote:
> No matter how you hash, a hacker can easily fill your defrag unit with
> not complete datagrams, so what's the point ?

I want to harden reassembly logic against all fragments being put in
the same hash bucket because of malicious traffic and thus creating
long list traversals in the fragment queue hash table.

I totally agree that fragments should be avoided if possible.

Thanks,

  Hannes

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