annotate tun

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
index 33e489d..72f1c5f 100644
--- a/include/linux/if_tun.h
+++ b/include/linux/if_tun.h
@@ -21,6 +21,8 @@
 /* Uncomment to enable debugging */
 /* #define TUN_DEBUG 1 */
 
+#include <linux/types.h>
+
 #ifdef __KERNEL__
 
 #ifdef TUN_DEBUG
@@ -88,7 +90,7 @@
 
 struct tun_pi {
 	unsigned short flags;
-	unsigned short proto;
+	__be16 proto;
 };
 #define TUN_PKT_STRIP	0x0001