/lib/udev/bridge-network-interface is in bridge-utils 1.5-6ubuntu2.
This file is owned by root:root, with mode 0o755.
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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | #!/bin/sh
# bridge-network-interface - configure a network bridge
#
# This service checks whether a physical network device that has been added
# is one of the ports in a bridge config, and if so, brings up the related
# bridge
set -e
if [ -z "$INTERFACE" ]; then
echo "missing \$INTERFACE" >&2
exit 1
fi
#default configuration
BRIDGE_HOTPLUG=no
[ -f /etc/default/bridge-utils ] && . /etc/default/bridge-utils
[ "$BRIDGE_HOTPLUG" = "no" ] && exit 0
. /lib/bridge-utils/bridge-utils.sh
if [ -d /run/network ]; then
for i in $(ifquery --list --allow auto); do
ports=$(ifquery $i | sed -n -e's/^bridge[_-]ports: //p')
for port in $(bridge_parse_ports $ports); do
case $port in
$INTERFACE|$INTERFACE.*)
if [ ! -d /sys/class/net/$port ] &&
[ -x /etc/network/if-pre-up.d/vlan ]; then
IFACE=$port /etc/network/if-pre-up.d/vlan
fi
if [ -d /sys/class/net/$port ]; then
if [ ! -d /sys/class/net/$i ]; then
brctl addbr $i
fi
brctl addif $i $port && ifconfig $port 0.0.0.0 up
fi
break
;;
esac
done
done
fi
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