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Message-ID: <20130903230127.GA32732@order.stressinduktion.org> 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! -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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