sock_diag: add SK_MEMINFO_DROPS

Reporting sk_drops to user space was available for UDP
sockets using /proc interface.

Add this to sock_diag, so that we can have the same information
available to ss users, and we'll be able to add sk_drops
indications for TCP sockets as well.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/sock_diag.h b/include/uapi/linux/sock_diag.h
index bae2d80..7ff505d 100644
--- a/include/uapi/linux/sock_diag.h
+++ b/include/uapi/linux/sock_diag.h
@@ -20,6 +20,7 @@
 	SK_MEMINFO_WMEM_QUEUED,
 	SK_MEMINFO_OPTMEM,
 	SK_MEMINFO_BACKLOG,
+	SK_MEMINFO_DROPS,
 
 	SK_MEMINFO_VARS,
 };