_IOWN
#define SIOCSIP6ADDRPOLICY _IOWN('i', 163, 0)
#define SIOCSCTPSOPT _IOWN('i', 172, 16) /* Set SCTP option */
#define SIOCADDRT _IOWN('r', 10, 48) /* add route */
#define SIOCDELRT _IOWN('r', 11, 48) /* delete route */