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

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Message-ID: <20130308161816.GF28531@order.stressinduktion.org>
Date:	Fri, 8 Mar 2013 17:18:16 +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 08:15:10AM -0800, Eric Dumazet wrote:
> On Fri, 2013-03-08 at 16:54 +0100, Hannes Frederic Sowa wrote:
> 
> > Btw. did s.o. have a look at skb->rxhash? I just started looking after
> > its many users but perhaps someone did this job already.
> 
> You mean for IPv6 ?

Yes, because of the usage of ipv6_addr_hash in skb_flow_dissect.

> Most of us use the rxhash provided by the NIC, our software fallback is
> a best effort as well for RPS or some qdisc.
> 
> If some hacker specifically cook packets hashing to same rxhash, thats
> fine.

Ok, good to know. Thanks!

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