in6_get_hw_ifid
if (in6_get_hw_ifid(ifp0, in6) == 0) {
if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
if (in6_get_hw_ifid(ifp, in6) != 0)
int in6_get_hw_ifid(struct ifnet *, struct in6_addr *);
if (in6_get_hw_ifid(ifp, &in6) == 0 &&