/etc/libvirt/nwfilter/no-ip-multicast.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 | <filter name='no-ip-multicast' chain='ipv4'>
<!-- drop if destination IP address is in the 224.0.0.0/4 subnet -->
<rule action='drop' direction='out'>
<ip dstipaddr='224.0.0.0' dstipmask='4' />
</rule>
<!-- not doing anything with receiving side ... -->
</filter>
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