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

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Date:	Wed, 20 Jul 2011 10:25:27 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Fernando Gont <fernando@...t.com.ar>,
	David Miller <davem@...emloft.net>
Cc:	security@...nel.org, Eugene Teo <eugeneteo@...nel.sg>,
	netdev <netdev@...r.kernel.org>, Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH net-next-2.6] ipv6: make fragment identifications less
 predictable

Le mardi 19 juillet 2011 à 22:47 +0200, Eric Dumazet a écrit :
> 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>
> ---


Please hold on, I'll make a different patch series to ease stable teams
job. It appears inetpeer & ipv6 are really not an option for old
kernels.

Common patch for all kernels :
1) Fix the problem without inetpeer help
--- 
Patches for next kernels
2) random split as suggested by Matt Mackal
3) Use inetpeer cache to scale identification generation


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