/etc/neutron/rootwrap.d/linuxbridge-plugin.filters is in neutron-plugin-linuxbridge-agent 1:2014.1-0ubuntu1.
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 11 12 13 14 15 16 17 18 19 | # neutron-rootwrap command filters for nodes on which neutron is
# expected to control network
#
# This file should be owned by (and only-writeable by) the root user
# format seems to be
# cmd-name: filter-name, raw-command, user, args
[Filters]
# linuxbridge-agent
# unclear whether both variants are necessary, but I'm transliterating
# from the old mechanism
brctl: CommandFilter, brctl, root
bridge: CommandFilter, bridge, root
# ip_lib
ip: IpFilter, ip, root
ip_exec: IpNetnsExecFilter, ip, root
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