netdev - Re: [PATCH net-next v2 4/8] net: ipv6: mld: implement RFC3810 MLDv2 mode only

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Date:	Wed, 4 Sep 2013 01:01:27 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/8] net: ipv6: mld: implement RFC3810 MLDv2 mode only

On Wed, Sep 04, 2013 at 12:19:40AM +0200, Daniel Borkmann wrote:
> RFC3810, 10. Security Considerations says under subsection 10.1.
> Query Message:
> 
>   A forged Version 1 Query message will put MLDv2 listeners on that
>   link in MLDv1 Host Compatibility Mode. This scenario can be avoided
>   by providing MLDv2 hosts with a configuration option to ignore
>   Version 1 messages completely.
> 
> Hence, implement a MLDv2-only mode that will ignore MLDv1 traffic:
> 
>   echo 2 > /proc/sys/net/ipv6/conf/ethX/force_mld_version  or
>   echo 2 > /proc/sys/net/ipv6/conf/all/force_mld_version
> 
> Note that <all> device has a higher precedence as it was previously
> also the case in the macro MLD_V1_SEEN() that would "short-circuit"
> if condition on <all> case.
> 
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>

Even better...

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Thanks!

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