--- zzzz-none-000/linux-4.9.231/net/xfrm/Kconfig	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/net/xfrm/Kconfig	2022-03-30 12:03:36.000000000 +0000
@@ -22,6 +22,14 @@
 
 	  If unsure, say Y.
 
+config XFRM_INTERFACE
+	tristate "Transformation virtual interface"
+	depends on XFRM && IPV6
+	---help---
+	  This provides a virtual interface to route IPsec traffic.
+
+	  If unsure, say N.
+
 config XFRM_SUB_POLICY
 	bool "Transformation sub policy support"
 	depends on XFRM