--- zzzz-none-000/linux-4.9.231/net/l2tp/l2tp_netlink.c	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/net/l2tp/l2tp_netlink.c	2022-03-30 12:03:35.000000000 +0000
@@ -541,6 +541,9 @@
 	}
 
 	if (tunnel->version > 2) {
+		if (info->attrs[L2TP_ATTR_OFFSET])
+			cfg.offset = nla_get_u16(info->attrs[L2TP_ATTR_OFFSET]);
+
 		if (info->attrs[L2TP_ATTR_DATA_SEQ])
 			cfg.data_seq = nla_get_u8(info->attrs[L2TP_ATTR_DATA_SEQ]);