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112 lines
3.7 KiB
112 lines
3.7 KiB
/* $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 <[email protected]> |
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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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