Function ifnet_byindex

freebsd/net/if.c:340–350

MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");

struct ifnet *
ifnet_byindex(u_short idx)
{
	struct ifnet *ifp;

	if (__predict_false(idx > V_if_index))
		return (NULL);

	ifp = *(struct ifnet * const volatile *)(V_ifindex_table + idx);
	return (__predict_false(ifp == IFNET_HOLD) ? NULL : ifp);
}

struct ifnet *
ifnet_byindex_ref(u_short idx)