netdev - Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

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Message-ID: <1340781845.2028.133.camel@localhost>
Date:	Wed, 27 Jun 2012 09:24:05 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, hans.schillstrom@...csson.com,
	subramanian.vijay@...il.com, dave.taht@...il.com,
	netdev@...r.kernel.org, ncardwell@...gle.com, therbert@...gle.com,
	mph@...h.dk
Subject: Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

On Tue, 2012-06-26 at 23:54 -0700, David Miller wrote:
> From: Jesper Dangaard Brouer <brouer@...hat.com>
> Date: Wed, 27 Jun 2012 08:32:13 +0200
> 
> > Using it as default, might be "dangerous" and open an attack vector
> > on SYN cookies in Linux.
> 
> If it's dangerous for syncookies then it's just as dangerous for
> the routing hash and the socket hashes where we use it already.
> 
> Therefore, this sounds like a baseless claim to me.

Yes, you are right. Looking at you patch again, you also use
syncookie_secret[c] as initval.  So, it should be safe.

But, I still believe that we need, to solve this SYN issues by parallel
processing of packets. (It seems Eric and Hans are looking at a single
core SYN processing scheme, but I might have missed their point).


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