[libvirt] [PATCH] nwfiler: fix due to non-symmetric src mac address match in iptables

Daniel Veillard veillard at redhat.com
Wed Apr 7 07:55:19 UTC 2010

On Tue, Apr 06, 2010 at 03:55:26PM -0400, Stefan Berger wrote:
> The attached patch fixes a problem due to the mac match in iptables only
> supporting --mac-source and no --mac-destination, thus it not being
> symmetric. Therefore a rule like this one
> <rule action='drop' direction='out'>
>   <all match='no' srcmacaddr='$MAC'/>
> </rule>
> should only have the MAC match on traffic leaving the VM and not test
> for the same source MAC address on traffic that the VM receives.
> Signed-off-by: Stefan Berger <stefanb at us.ibm.com>

  Okay, I had to check _iptablesCreateRuleInstance() source to find out
it's a giant switch, then patch makes sense, looks low risk and well



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