openwrt-xburst/target/linux/brcm-2.4/base-files/default/etc/hotplug2-init.rules

DEVICENAME ~~ (tun|tap[0-9]) {
	makedev /dev/net/%DEVICENAME% 0644
	next
}

DEVPATH is set {
	makedev /dev/%DEVICENAME% 0644
}

SUBSYSTEM ~~ button {
	exec kill -USR1 1 ;
}