--- zzzz-none-000/linux-2.6.39.4/include/linux/l2tp.h	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/include/linux/l2tp.h	2021-11-10 13:38:17.000000000 +0000
@@ -8,9 +8,10 @@
 #define _LINUX_L2TP_H_
 
 #include <linux/types.h>
-#ifdef __KERNEL__
 #include <linux/socket.h>
+#ifdef __KERNEL__
 #include <linux/in.h>
+#include <linux/in6.h>
 #else
 #include <netinet/in.h>
 #endif
@@ -33,11 +34,28 @@
 	__u32		l2tp_conn_id;	/* Connection ID of tunnel */
 
 	/* Pad to size of `struct sockaddr'. */
-	unsigned char	__pad[sizeof(struct sockaddr) - sizeof(sa_family_t) -
+	unsigned char	__pad[sizeof(struct sockaddr) -
+			      sizeof(sa_family_t) -
 			      sizeof(__be16) - sizeof(struct in_addr) -
 			      sizeof(__u32)];
 };
 
+/**
+ * struct sockaddr_l2tpip6 - the sockaddr structure for L2TP-over-IPv6 sockets
+ * @l2tp_family:  address family number AF_L2TPIP.
+ * @l2tp_addr:    protocol specific address information
+ * @l2tp_conn_id: connection id of tunnel
+ */
+struct sockaddr_l2tpip6 {
+	/* The first fields must match struct sockaddr_in6 */
+	sa_family_t l2tp_family; /* AF_INET6 */
+	__be16		l2tp_unused;	/* INET port number (unused) */
+	__be32		l2tp_flowinfo;	/* IPv6 flow information */
+	struct in6_addr	l2tp_addr;	/* IPv6 address */
+	__u32		l2tp_scope_id;	/* scope id (new in RFC2553) */
+	__u32		l2tp_conn_id;	/* Connection ID of tunnel */
+};
+
 /*****************************************************************************
  *  NETLINK_GENERIC netlink family.
  *****************************************************************************/
@@ -107,6 +125,8 @@
 	L2TP_ATTR_MTU,			/* u16 */
 	L2TP_ATTR_MRU,			/* u16 */
 	L2TP_ATTR_STATS,		/* nested */
+	L2TP_ATTR_IP6_SADDR,		/* struct in6_addr */
+	L2TP_ATTR_IP6_DADDR,		/* struct in6_addr */
 	__L2TP_ATTR_MAX,
 };
 
@@ -160,4 +180,4 @@
 #define L2TP_GENL_NAME		"l2tp"
 #define L2TP_GENL_VERSION	0x1
 
-#endif
+#endif /* _LINUX_L2TP_H_ */