Restore raspbmc iptables settings

Hello there! I would like to keep my raspbmc iptables rules working, so I’ve already installed the iptables package and imported my securre-rmc script to /etc/network/if-up.d/ (from raspbmc). But… what should I do in order to automatically execute the script after rebooting? Which parameters do I need to use in the call?

I am running osmc on a rpi2.