diff --git a/include/linux/concap.h b/include/linux/concap.h
new file mode 100644
index 0000000..2730465
--- /dev/null
+++ b/include/linux/concap.h
@@ -0,0 +1,113 @@
+/* $Id: concap.h,v 1.3.2.2 2004/01/12 23:08:35 keil Exp $
+ *
+ * Copyright 1997 by Henner Eisen <eis@baty.hanse.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#ifndef _LINUX_CONCAP_H
+#define _LINUX_CONCAP_H
+#ifdef __KERNEL__
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+
+/* Stuff to support encapsulation protocols genericly. The encapsulation
+   protocol is processed at the uppermost layer of the network interface.
+
+   Based on a ideas developed in a 'synchronous device' thread in the
+   linux-x25 mailing list contributed by Alan Cox, Thomasz Motylewski
+   and Jonathan Naylor.
+
+   For more documetation on this refer to Documentation/isdn/README.concap
+*/
+
+struct concap_proto_ops;
+struct concap_device_ops;
+
+/* this manages all data needed by the encapsulation protocol
+ */
+struct concap_proto{
+	struct net_device *net_dev;	/* net device using our service  */
+	struct concap_device_ops *dops;	/* callbacks provided by device */
+ 	struct concap_proto_ops  *pops;	/* callbacks provided by us */
+ 	spinlock_t lock;
+	int flags;
+	void *proto_data;		/* protocol specific private data, to
+					   be accessed via *pops methods only*/
+	/*
+	  :
+	  whatever 
+	  :
+	  */
+};
+
+/* Operations to be supported by the net device. Called by the encapsulation
+ * protocol entity. No receive method is offered because the encapsulation
+ * protocol directly calls netif_rx().
+ */
+struct concap_device_ops{
+
+	/* to request data is submitted by device*/ 
+	int (*data_req)(struct concap_proto *, struct sk_buff *);
+
+	/* Control methods must be set to NULL by devices which do not
+	   support connection control.*/
+	/* to request a connection is set up */ 
+	int (*connect_req)(struct concap_proto *);
+
+	/* to request a connection is released */
+	int (*disconn_req)(struct concap_proto *);	
+};
+
+/* Operations to be supported by the encapsulation protocol. Called by
+ * device driver.
+ */
+struct concap_proto_ops{
+
+	/* create a new encapsulation protocol instance of same type */
+	struct concap_proto *  (*proto_new) (void);
+
+	/* delete encapsulation protocol instance and free all its resources.
+	   cprot may no loger be referenced after calling this */
+	void (*proto_del)(struct concap_proto *cprot);
+
+	/* initialize the protocol's data. To be called at interface startup
+	   or when the device driver resets the interface. All services of the
+	   encapsulation protocol may be used after this*/
+	int (*restart)(struct concap_proto *cprot, 
+		       struct net_device *ndev,
+		       struct concap_device_ops *dops);
+
+	/* inactivate an encapsulation protocol instance. The encapsulation
+	   protocol may not call any *dops methods after this. */
+	int (*close)(struct concap_proto *cprot);
+
+	/* process a frame handed down to us by upper layer */
+	int (*encap_and_xmit)(struct concap_proto *cprot, struct sk_buff *skb);
+
+	/* to be called for each data entity received from lower layer*/ 
+	int (*data_ind)(struct concap_proto *cprot, struct sk_buff *skb);
+
+	/* to be called when a connection was set up/down.
+	   Protocols that don't process these primitives might fill in
+	   dummy methods here */
+	int (*connect_ind)(struct concap_proto *cprot);
+	int (*disconn_ind)(struct concap_proto *cprot);
+  /*
+    Some network device support functions, like net_header(), rebuild_header(),
+    and others, that depend solely on the encapsulation protocol, might
+    be provided here, too. The net device would just fill them in its
+    corresponding fields when it is opened.
+    */
+};
+
+/* dummy restart/close/connect/reset/disconn methods
+ */
+extern int concap_nop(struct concap_proto *cprot); 
+
+/* dummy submit method
+ */
+extern int concap_drop_skb(struct concap_proto *cprot, struct sk_buff *skb);
+#endif
+#endif