ncprange_contains
if (ncprange_contains(&iface->addr[n].ifa, &ncplocal) ||
ncprange_contains(&fp->f_src, &srcaddr)) &&
ncprange_contains(&fp->f_dst, &dstaddr))) {
if (ncprange_contains(&ipcp->cfg.peer_range, &iface->addr[n].peer)) {
if (ncprange_contains(&ipcp->cfg.my_range, &ipaddr)) {
extern int ncprange_contains(const struct ncprange *, const struct ncpaddr *);