in6_ndifreq90
#define OSIOCSDEFIFACE_IN6 _IOWR('i', 85, struct in6_ndifreq90)
#define OSIOCGDEFIFACE_IN6 _IOWR('i', 86, struct in6_ndifreq90)
struct in6_ndifreq90 *ndif = (struct in6_ndifreq90 *)data;