nd6_ns_output
nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL);
nd6_ns_output(ifp, psrc, pdst, dst, NULL);
void nd6_ns_output(struct ifnet *, const struct in6_addr *,
nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,