Function if_down

freebsd/net/if.c:2306–2312

* Mark an interface down and notify protocols of * the transition. */

 * the transition.
 */
void
if_down(struct ifnet *ifp)
{

	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
	if_unroute(ifp, IFF_UP, AF_UNSPEC);
}

/*
 * Mark an interface up and notify protocols of