userspace/libwr: add rtu_shmem_header

Add rtu_shmem_header to keep track of all rtu's data in shmem

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

userspace/libwr/include/libwr/rtu_shmem.h

@@ -88,5 +88,11 @@ struct rtu_vlan_table_entry {
 	int drop;		/* 1: drop the packet (VLAN not registered) */
 };
 
+/* This is the overall structure stored in shared memory */
+#define RTU_SHMEM_VERSION 1 /* Version 1 */
+struct rtu_shmem_header {
+	struct rtu_filtering_entry *filters;
+	struct rtu_vlan_table_entry *vlans;
+};
 
 #endif /*  __LIBWR_RTU_SHMEM_H__ */