in_ioctl
rv = in_ioctl(SIOCDIFADDR, (caddr_t)&ifra, ifp, 1);
rv = in_ioctl(SIOCAIFADDR, (caddr_t)&ifra, ifp, 1);
return in_ioctl(cmd, data, ifp, privileged);
int in_ioctl(u_long, caddr_t, struct ifnet *, int);