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/* $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