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

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Message-ID: <20130221230613.GB9671@order.stressinduktion.org>
Date:	Fri, 22 Feb 2013 00:06:13 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH] ipv6: use a stronger hash for tcp

On Thu, Feb 21, 2013 at 02:48:23PM -0800, Eric Dumazet wrote:
> On Thu, 2013-02-21 at 23:43 +0100, Hannes Frederic Sowa wrote:
> 
> > 
> > Perhaps we should use ipv6_addr_jhash in the destination cache, too, and look
> > at other uses of ipv6_addr_hash?
> 
> Sure, an audit is needed, but with tcp early demux, TCP lookup was the
> first weak point.

I had two simple programs to test this. Perhaps they could be helpful
to somebody:

tcpproxy.c - does 3whs and teardown
gensyn6.c -  generates syn packets from /64 range

https://gist.github.com/hannes/5009267

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