/* $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 #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