netdev - Re: [PATCH net-next-2.6] ipv6: make fragment identifications less predictable

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Message-Id: <20110721.212616.1138861523109414324.davem@davemloft.net>
Date:	Thu, 21 Jul 2011 21:26:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	fernando@...t.com.ar, security@...nel.org, eugeneteo@...nel.sg,
	netdev@...r.kernel.org, mpm@...enic.com
Subject: Re: [PATCH net-next-2.6] ipv6: make fragment identifications less
 predictable

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 19 Jul 2011 22:47:03 +0200

> IPv6 fragment identification generation is way beyond what we use for
> IPv4 : It uses a single generator. Its not scalable and allows DOS
> attacks.
> 
> Now inetpeer is IPv6 aware, we can use it to provide a more secure and
> scalable frag ident generator (per destination, instead of system wide)
> 
> This patch :
> 1) defines a new secure_ipv6_id() helper
> 2) extends inet_getid() to provide 32bit results
> 3) extends ipv6_select_ident() with a new dest parameter
> 
> Reported-by: Fernando Gont <fernando@...t.com.ar>
> CC: Matt Mackall <mpm@...enic.com>
> CC: Eugene Teo <eugeneteo@...nel.sg>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, and I'll queue up your backport-friendly version for -stable.
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