netdev - Re: [RFC PATCH 0/2] Faster/parallel SYN handling to mitigate SYN floods

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Message-ID: <1338367824.2760.128.camel@edumazet-glaptop>
Date:	Wed, 30 May 2012 10:50:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Martin Topholm <mph@...h.dk>, Florian Westphal <fw@...len.de>,
	opurdila@...acom.com,
	Hans Schillstrom <hans.schillstrom@...csson.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC PATCH 0/2] Faster/parallel SYN handling to mitigate SYN
 floods

On Wed, 2012-05-30 at 10:44 +0200, Jesper Dangaard Brouer wrote:

> Choosing that code path, should be easy by simply returning 0 (no_limit)
> from my function tcp_v4_syn_conn_limit(), to indicate that the normal
> slow code path should be chosen.
> 
> I guess this will not pose a big attack angle, as the entries in
> reqsk_queue will be fairly small.

Not sure what you mean.

I know some people have 64K entries in it.

(sk_ack_backlog / sk_max_ack_backlog being 16bits, 
listen(fd, 65536 + 1) can give unexpected results)



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