--- zzzz-none-000/linux-4.9.231/include/uapi/linux/if.h	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/include/uapi/linux/if.h	2022-03-30 12:03:35.000000000 +0000
@@ -130,6 +130,7 @@
 #define IFF_VOLATILE	(IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST|IFF_ECHO|\
 		IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT)
 
+#define IFF_BR2684 0x80 /* nas RFC2684 interface        */
 #define IF_GET_IFACE	0x0001		/* for querying only */
 #define IF_GET_PROTO	0x0002