[libvirt-users] East-west traffic network filter

[Daniel P. Berrangé]

On Thu, Jun 28, 2018 at 10:18:57AM +0200, Ales Musil wrote:
> Hello,
> 
> I would like to make filter that allows communication only between
> specified VMs. Those VMs should be specified by their MAC address. The
> filter should extend clean-traffic but I was not able to get it working
> with that reference. I have came up with modified clean-traffic which works
> fine [1]. Is there a way to achieve the same behavior with reference to
> clean-traffic?

Honestly I think the way you've done it is the right way. "clean-traffic"
is best thought of as a simple demo. If it does what you need, great, but
we'd expect people to create their own filters for anything more advanced.
The clean-traffic rules were modularized so you can use <filterrefs> to
avoid too much duplication. So what you've done looks fine to me.

> [1]
> <filter name='clean-traffic-gateway'>
> <!-- An example of a traffic filter enforcing clean traffic
>         from a VM by
>       - preventing MAC spoofing -->
> <filterref filter='no-mac-spoofing'/>
> 
> <!-- preventing IP spoofing on outgoing -->
> <filterref filter='no-ip-spoofing'/>
> <!-- preventing ARP spoofing/poisoning -->
>   <filterref filter='no-arp-spoofing'/>
> <!-- accept all other incoming and outgoing ARP traffic -->
>   <rule action='accept' direction='inout' priority='-500'>
>     <mac protocolid='arp'/>
>   </rule>
> <!-- accept traffic only from specified MAC address -->
> <rule action='accept' direction='in'>
>                 <mac match='yes' srcmacaddr='$GATEWAY_MAC'
> srcmacmask='$GATEWAY_MAC_MASK' />
>         </rule>
> <!-- allow traffic only to specified MAC address -->
>         <rule action='accept' direction='out'>
>                 <mac match='yes' dstmacaddr='$GATEWAY_MAC'
> dstmacmask='$GATEWAY_MAC_MASK' />
>         </rule>
> <!-- preventing any other traffic than between specified MACs
> and ARP -->
>   <filterref filter='no-other-l2-traffic'/>
> 
> <!-- allow qemu to send a self-announce upon migration end -->
> <filterref filter='qemu-announce-self'/>
> </filter>
> 
> 
> -- 
> 
> ALES MUSIL
> INTERN - rhv network
> 
> Red Hat EMEA <https://www.redhat.com/>
> 
> 
> amusil at redhat.com   IM: amusil
> <https://red.ht/sig>

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Regards,
Daniel
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