in6_control_ioctl
return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
int in6_control_ioctl(u_long, void *, struct ifnet *, struct ucred *);
return (in6_control_ioctl(SIOCAIFADDR_IN6, &req, ifp, nlp_get_cred(nlp)));
return (in6_control_ioctl(SIOCDIFADDR_IN6, &req, ifp, nlp_get_cred(nlp)));