ipv6: allow routes to be configured with expire values

Add the support for adding expire value to routes,  requested by
Tom Gundersen <teg@jklm.no> for systemd-networkd, and NetworkManager
wants it too.

implement it by adding the new RTNETLINK attribute RTA_EXPIRES.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 123a5af..ca764b5 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -311,6 +311,7 @@
 	RTA_PREF,
 	RTA_ENCAP_TYPE,
 	RTA_ENCAP,
+	RTA_EXPIRES,
 	__RTA_MAX
 };