netdev - Re: [RFC PATCH] tcp: Fast/early SYN handling to mitigate SYN floods

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Message-ID: <1337880446.2655.2.camel@edumazet-glaptop>
Date:	Thu, 24 May 2012 19:27:26 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	christoph.paasch@...ouvain.be, David Miller <davem@...emloft.net>,
	Martin Topholm <mph@...h.dk>, netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [RFC PATCH] tcp: Fast/early SYN handling to mitigate SYN floods

On Thu, 2012-05-24 at 19:21 +0200, Jesper Dangaard Brouer wrote:

> Sorry, don't remember.

http://kerneltrap.org/mailarchive/linux-netdev/2010/4/19/6274993

> Sounds really promising, especially coming from the network-ninja :-)

;)

> Yes, this is more an emergency mode.
> 
> I was thinking of only handling the SYN cookie case in parallel.
> That should be easier locking wise, right.
> 
> I'm also considering writing a netfilter/iptables syn-cookie module, as
> this would allow people to use it in combination with IPset, to e.g
> create a whitelist feature of known-good-hosts (which have completed the
> TCP handshake). But it would be nicer if the base kernel was just fast
> enough to handle these SYN floods.
> 

Indeed, I believe I can make this happen eventually in a short term.



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