netdev - Re: [RFC PATCH 2/2] tcp: Early SYN limit and SYN cookie handling to mitigate SYN floods

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Message-ID: <1338473361.2760.1361.camel@edumazet-glaptop>
Date:	Thu, 31 May 2012 16:09:21 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hans Schillstrom <hans.schillstrom@...csson.com>
Cc:	Rick Jones <rick.jones2@...com>, Andi Kleen <andi@...stfloor.org>,
	Jesper Dangaard Brouer <jbrouer@...hat.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Christoph Paasch <christoph.paasch@...ouvain.be>,
	"David S. Miller" <davem@...emloft.net>,
	Martin Topholm <mph@...h.dk>, Florian Westphal <fw@...len.de>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [RFC PATCH 2/2] tcp: Early SYN limit and SYN cookie handling
 to mitigate SYN floods

On Thu, 2012-05-31 at 10:45 +0200, Hans Schillstrom wrote:

> I can see plenty "IPv4: dst cache overflow"
> 

This is probably the most problematic problem in DDOS attacks.

I have a patch for this problem.

Idea is to not cache dst entries for following cases :

1) Input dst, if listener queue is full (syncookies possibly engaged)

2) Output dst of SYNACK messages.



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