diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 1ecaea7..91ac97c 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -93,6 +93,8 @@
 #define RTM_MAX		(((__RTM_MAX + 3) & ~3) - 1)
 };
 
+#define RTM_NR_MSGTYPES	(RTM_MAX + 1 - RTM_BASE)
+#define RTM_NR_FAMILIES	(RTM_NR_MSGTYPES >> 2)
 #define RTM_FAM(cmd)	(((cmd) - RTM_BASE) >> 2)
 
 /*