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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* $Id: concap.h,v 1.1 2004-01-28 15:25:03 giacomo Exp $ |
| 2 | * |
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| 3 | * Copyright 1997 by Henner Eisen <eis@baty.hanse.de> |
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| 4 | * |
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| 5 | * This software may be used and distributed according to the terms |
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| 6 | * of the GNU General Public License, incorporated herein by reference. |
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| 7 | */ |
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| 8 | |||
| 9 | #ifndef _LINUX_CONCAP_H |
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| 10 | #define _LINUX_CONCAP_H |
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| 11 | #ifdef __KERNEL__ |
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| 12 | #include <linux/skbuff.h> |
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| 13 | #include <linux/netdevice.h> |
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| 14 | |||
| 15 | /* Stuff to support encapsulation protocols genericly. The encapsulation |
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| 16 | protocol is processed at the uppermost layer of the network interface. |
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| 17 | |||
| 18 | Based on a ideas developed in a 'synchronous device' thread in the |
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| 19 | linux-x25 mailing list contributed by Alan Cox, Thomasz Motylewski |
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| 20 | and Jonathan Naylor. |
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| 21 | |||
| 22 | For more documetation on this refer to Documentation/isdn/README.concap |
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| 23 | */ |
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| 24 | |||
| 25 | struct concap_proto_ops; |
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| 26 | struct concap_device_ops; |
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| 27 | |||
| 28 | /* this manages all data needed by the encapsulation protocol |
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| 29 | */ |
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| 30 | struct concap_proto{ |
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| 31 | struct net_device *net_dev; /* net device using our service */ |
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| 32 | struct concap_device_ops *dops; /* callbacks provided by device */ |
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| 33 | struct concap_proto_ops *pops; /* callbacks provided by us */ |
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| 34 | int flags; |
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| 35 | void *proto_data; /* protocol specific private data, to |
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| 36 | be accessed via *pops methods only*/ |
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| 37 | /* |
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| 38 | : |
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| 39 | whatever |
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| 40 | : |
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| 41 | */ |
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| 42 | }; |
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| 43 | |||
| 44 | /* Operations to be supported by the net device. Called by the encapsulation |
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| 45 | * protocol entity. No receive method is offered because the encapsulation |
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| 46 | * protocol directly calls netif_rx(). |
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| 47 | */ |
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| 48 | struct concap_device_ops{ |
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| 49 | |||
| 50 | /* to request data is submitted by device*/ |
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| 51 | int (*data_req)(struct concap_proto *, struct sk_buff *); |
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| 52 | |||
| 53 | /* Control methods must be set to NULL by devices which do not |
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| 54 | support connection control.*/ |
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| 55 | /* to request a connection is set up */ |
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| 56 | int (*connect_req)(struct concap_proto *); |
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| 57 | |||
| 58 | /* to request a connection is released */ |
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| 59 | int (*disconn_req)(struct concap_proto *); |
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| 60 | }; |
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| 61 | |||
| 62 | /* Operations to be supported by the encapsulation protocol. Called by |
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| 63 | * device driver. |
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| 64 | */ |
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| 65 | struct concap_proto_ops{ |
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| 66 | |||
| 67 | /* create a new encapsulation protocol instance of same type */ |
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| 68 | struct concap_proto * (*proto_new) (void); |
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| 69 | |||
| 70 | /* delete encapsulation protocol instance and free all its resources. |
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| 71 | cprot may no loger be referenced after calling this */ |
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| 72 | void (*proto_del)(struct concap_proto *cprot); |
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| 73 | |||
| 74 | /* initialize the protocol's data. To be called at interface startup |
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| 75 | or when the device driver resets the interface. All services of the |
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| 76 | encapsulation protocol may be used after this*/ |
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| 77 | int (*restart)(struct concap_proto *cprot, |
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| 78 | struct net_device *ndev, |
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| 79 | struct concap_device_ops *dops); |
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| 80 | |||
| 81 | /* inactivate an encapsulation protocol instance. The encapsulation |
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| 82 | protocol may not call any *dops methods after this. */ |
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| 83 | int (*close)(struct concap_proto *cprot); |
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| 84 | |||
| 85 | /* process a frame handed down to us by upper layer */ |
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| 86 | int (*encap_and_xmit)(struct concap_proto *cprot, struct sk_buff *skb); |
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| 87 | |||
| 88 | /* to be called for each data entity received from lower layer*/ |
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| 89 | int (*data_ind)(struct concap_proto *cprot, struct sk_buff *skb); |
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| 90 | |||
| 91 | /* to be called when a connection was set up/down. |
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| 92 | Protocols that don't process these primitives might fill in |
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| 93 | dummy methods here */ |
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| 94 | int (*connect_ind)(struct concap_proto *cprot); |
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| 95 | int (*disconn_ind)(struct concap_proto *cprot); |
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| 96 | /* |
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| 97 | Some network device support functions, like net_header(), rebuild_header(), |
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| 98 | and others, that depend solely on the encapsulation protocol, might |
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| 99 | be provided here, too. The net device would just fill them in its |
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| 100 | corresponding fields when it is opened. |
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| 101 | */ |
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| 102 | }; |
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| 103 | |||
| 104 | /* dummy restart/close/connect/reset/disconn methods |
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| 105 | */ |
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| 106 | extern int concap_nop(struct concap_proto *cprot); |
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| 107 | |||
| 108 | /* dummy submit method |
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| 109 | */ |
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| 110 | extern int concap_drop_skb(struct concap_proto *cprot, struct sk_buff *skb); |
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| 111 | #endif |
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| 112 | #endif |