in6_rrenumreq
#define SIOCAIFPREFIX_IN6 _IOW('i', 103, struct in6_rrenumreq) /* add */
struct in6_rrenumreq) /* change */
struct in6_rrenumreq) /* set global */
struct in6_rrenumreq *irr, int ifindex)
struct in6_rrenumreq irr;