in6_aliasreq50
#define OSIOCAIFADDR_IN6 _IOW('i', 26, struct in6_aliasreq50)
#define OSIOCSIFPHYADDR_IN6 _IOW('i', 70, struct in6_aliasreq50)
struct in6_aliasreq50 *oar =
(struct in6_aliasreq50 *)(void *)ar;
struct in6_aliasreq50 cp;