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