diff -drupN a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
--- a/include/uapi/linux/sysctl.h	2018-08-06 17:23:04.000000000 +0300
+++ b/include/uapi/linux/sysctl.h	2022-06-12 05:28:14.000000000 +0300
@@ -568,6 +568,7 @@ enum {
 	NET_IPV6_PROXY_NDP=23,
 	NET_IPV6_ACCEPT_SOURCE_ROUTE=25,
 	NET_IPV6_ACCEPT_RA_FROM_LOCAL=26,
+	NET_IPV6_ACCEPT_RA_RT_INFO_MIN_PLEN=27,
 	__NET_IPV6_MAX
 };