in6_gre_ioctl
error = in6_gre_ioctl(sc, SIOCSIFPHYADDR_IN6, (caddr_t)&aliasreq.in6);
if (in6_gre_ioctl(sc, SIOCGIFPSRCADDR_IN6, (caddr_t)&ifr) == 0)
if (in6_gre_ioctl(sc, SIOCGIFPDSTADDR_IN6, (caddr_t)&ifr) == 0)
error = in6_gre_ioctl(sc, cmd, data);
int in6_gre_ioctl(struct gre_softc *, u_long, caddr_t);