in6_ioctl
rv = in6_ioctl(SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, 1);
int in6_ioctl(u_long, caddr_t, struct ifnet *, int);
return in6_ioctl(cmd, data, ifp, privileged);
int in6_ioctl(u_long, caddr_t, struct ifnet *, int);