unsigned long flags;
int attached;
uid_t owner;
+ gid_t group;
wait_queue_head_t read_wait;
struct sk_buff_head readq;
#define TUNSETPERSIST _IOW('T', 203, int)
#define TUNSETOWNER _IOW('T', 204, int)
#define TUNSETLINK _IOW('T', 205, int)
+#define TUNSETGROUP _IOW('T', 206, int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001