1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index d607219af6ac..1ecaea74d55a 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -93,6 +93,8 @@ enum {
 #define RTM_MAX         (((__RTM_MAX + 3) & ~3) - 1)
 };
 
+#define RTM_FAM(cmd)    (((cmd) - RTM_BASE) >> 2)
+
 /* 
    Generic structure for encapsulation of optional route information.
    It is reminiscent of sockaddr, but with sa_family replaced