nd6_is_addr_neighbor
if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
int nd6_is_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *);
if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {