/etc/libvirt/nwfilter/no-mac-spoofing.xml is in libvirt-bin 1.3.1-1ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | <filter name='no-mac-spoofing' chain='mac' priority='-800'>
<!-- return packets with VM's MAC address as source address -->
<rule direction='out' action='return'>
<mac srcmacaddr='$MAC'/>
</rule>
<!-- drop everything else -->
<rule direction='out' action='drop'>
<mac/>
</rule>
</filter>
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