--- zzzz-none-000/linux-4.19.183/net/l2tp/l2tp_core.h	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/net/l2tp/l2tp_core.h	2023-06-28 08:54:21.000000000 +0000
@@ -61,6 +61,7 @@
 						 * control of LNS. */
 	int			debug;		/* bitmask of debug message
 						 * categories */
+	u16			offset;		/* offset to payload */
 	u16			l2specific_type; /* Layer 2 specific type */
 	u8			cookie[8];	/* optional cookie */
 	int			cookie_len;	/* 0, 4 or 8 bytes */
@@ -84,6 +85,8 @@
 	int			cookie_len;
 	u8			peer_cookie[8];
 	int			peer_cookie_len;
+	u16			offset;		/* offset from end of L2TP header
+						   to beginning of data */
 	u16			l2specific_type;
 	u16			hdr_len;
 	u32			nr;		/* session NR state (receive) */