diff --git a/include/linux/x25.h b/include/linux/x25.h
new file mode 100644
index 0000000..7531cfe
--- /dev/null
+++ b/include/linux/x25.h
@@ -0,0 +1,112 @@
+/*
+ * These are the public elements of the Linux kernel X.25 implementation.
+ *
+ * 	History
+ *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities 
+ *					  negotiation.
+ */
+
+#ifndef	X25_KERNEL_H
+#define	X25_KERNEL_H
+
+#define	SIOCX25GSUBSCRIP	(SIOCPROTOPRIVATE + 0)
+#define	SIOCX25SSUBSCRIP	(SIOCPROTOPRIVATE + 1)
+#define	SIOCX25GFACILITIES	(SIOCPROTOPRIVATE + 2)
+#define	SIOCX25SFACILITIES	(SIOCPROTOPRIVATE + 3)
+#define	SIOCX25GCALLUSERDATA	(SIOCPROTOPRIVATE + 4)
+#define	SIOCX25SCALLUSERDATA	(SIOCPROTOPRIVATE + 5)
+#define	SIOCX25GCAUSEDIAG	(SIOCPROTOPRIVATE + 6)
+
+/*
+ *	Values for {get,set}sockopt.
+ */
+#define	X25_QBITINCL		1
+
+/*
+ *	X.25 Packet Size values.
+ */
+#define	X25_PS16		4
+#define	X25_PS32		5
+#define	X25_PS64		6
+#define	X25_PS128		7
+#define	X25_PS256		8
+#define	X25_PS512		9
+#define	X25_PS1024		10
+#define	X25_PS2048		11
+#define	X25_PS4096		12
+
+/*
+ * An X.121 address, it is held as ASCII text, null terminated, up to 15
+ * digits and a null terminator.
+ */
+struct x25_address {
+	char x25_addr[16];
+};
+
+/*
+ *	Linux X.25 Address structure, used for bind, and connect mostly.
+ */
+struct sockaddr_x25 {
+	sa_family_t	   sx25_family;		/* Must be AF_X25 */
+	struct x25_address sx25_addr;		/* X.121 Address */
+};
+
+/*
+ *	DTE/DCE subscription options.
+ *
+ *      As this is missing lots of options, user should expect major
+ *	changes of this structure in 2.5.x which might break compatibilty.
+ *      The somewhat ugly dimension 200-sizeof() is needed to maintain
+ *	backward compatibility.
+ */
+struct x25_subscrip_struct {
+	char device[200-sizeof(unsigned long)];
+	unsigned long	global_facil_mask;	/* 0 to disable negotiation */
+	unsigned int	extended;
+};
+
+/* values for above global_facil_mask */
+
+#define	X25_MASK_REVERSE	0x01	
+#define	X25_MASK_THROUGHPUT	0x02
+#define	X25_MASK_PACKET_SIZE	0x04
+#define	X25_MASK_WINDOW_SIZE	0x08
+
+
+
+/*
+ *	Routing table control structure.
+ */
+struct x25_route_struct {
+	struct x25_address address;
+	unsigned int	   sigdigits;
+	char		   device[200];
+};
+
+/*
+ *	Facilities structure.
+ */
+struct x25_facilities {
+	unsigned int	winsize_in, winsize_out;
+	unsigned int	pacsize_in, pacsize_out;
+	unsigned int	throughput;
+	unsigned int	reverse;
+};
+
+/*
+ *	Call User Data structure.
+ */
+struct x25_calluserdata {
+	unsigned int	cudlength;
+	unsigned char	cuddata[128];
+};
+
+/*
+ *	Call clearing Cause and Diagnostic structure.
+ */
+struct x25_causediag {
+	unsigned char	cause;
+	unsigned char	diagnostic;
+};
+
+#endif