-static int __dn_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen, int flags);
-static int __dn_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen, int flags);
+static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
+static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);