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/* $Id: concap.h,v 1.1 2004-01-28 15:25:03 giacomo 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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#ifdef __KERNEL__
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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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        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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#endif