ncprange_getsa
ncprange_getsa(&addr->ifa, &ssme, NULL);
ncprange_getsa(&addr->ifa, &ssme, &ssmsk);
ncprange_getsa(&myrange, &ssgw, &ssmask);
ncprange_getsa(&myrange, &ssgw, &ssmask);
extern void ncprange_getsa(const struct ncprange *, struct sockaddr_storage *,
ncprange_getsa(dst, &sadst, &samask);