source: clfs-embedded/bootscripts/clfs/rc.d/init.d/bridge@ e269c28

#!/bin/ash
#
# Network interface(s) init script
#
# config: /etc/network.conf
#        /etc/network.d/interface.[devname]

. /etc/rc.d/init.d/functions
. /etc/network.conf

if [ "$NETWORKING" != "yes" ] || [ "${BRIDGE_INTERFACES}" = "" ]; then
        exit 0
fi

if [ ! -x /usr/sbin/brctl ]; then
        echo -n "Setting up bridge: /usr/sbin/brctl not found "
        false
        check_status
fi

case "$1" in
start)
        echo -n "Adding bridge br0: "
        brctl addbr br0
        check_status

        for n in ${BRIDGE_INTERFACES}; do
                echo -n "Adding ${n} to bridge: "
                brctl addif br0 ${n}
                # Bring up the interface unless its wireless
                # Wireless has to be configured before you can put it up
                if [ $? = 0 ] && [ ${n} != wlan0 ]; then ifconfig ${n} up; fi
                check_status
        done
        ;;
stop)
        for n in ${BRIDGE_INTERFACES}; do
                echo -n "Removing ${n} from bridge br0: "
                ifconfig ${n} down 2>/dev/null
                brctl delif br0 ${n}
                check_status
        done
        echo -n "Removing bridge br0: "
        ifconfig br0 down 2>/dev/null
        brctl delbr br0
        check_status
        ;;
restart)
        $0 stop
        $0 start
        ;;
status)
        brctl show
        ;;
*)
        echo "Usage: $0 {start|stop|restart|status}"
        exit 1
esac