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| Rev | Author | Line No. | Line |
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| 422 | giacomo | 1 | #ifndef _PPP_CHANNEL_H_ |
| 2 | #define _PPP_CHANNEL_H_ |
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| 3 | /* |
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| 4 | * Definitions for the interface between the generic PPP code |
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| 5 | * and a PPP channel. |
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| 6 | * |
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| 7 | * A PPP channel provides a way for the generic PPP code to send |
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| 8 | * and receive packets over some sort of communications medium. |
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| 9 | * Packets are stored in sk_buffs and have the 2-byte PPP protocol |
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| 10 | * number at the start, but not the address and control bytes. |
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| 11 | * |
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| 12 | * Copyright 1999 Paul Mackerras. |
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| 13 | * |
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| 14 | * This program is free software; you can redistribute it and/or |
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| 15 | * modify it under the terms of the GNU General Public License |
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| 16 | * as published by the Free Software Foundation; either version |
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| 17 | * 2 of the License, or (at your option) any later version. |
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| 18 | * |
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| 19 | * ==FILEVERSION 20000322== |
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| 20 | */ |
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| 21 | |||
| 22 | #include <linux/list.h> |
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| 23 | #include <linux/skbuff.h> |
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| 24 | #include <linux/poll.h> |
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| 25 | |||
| 26 | struct ppp_channel; |
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| 27 | |||
| 28 | struct ppp_channel_ops { |
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| 29 | /* Send a packet (or multilink fragment) on this channel. |
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| 30 | Returns 1 if it was accepted, 0 if not. */ |
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| 31 | int (*start_xmit)(struct ppp_channel *, struct sk_buff *); |
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| 32 | /* Handle an ioctl call that has come in via /dev/ppp. */ |
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| 33 | int (*ioctl)(struct ppp_channel *, unsigned int, unsigned long); |
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| 34 | }; |
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| 35 | |||
| 36 | struct ppp_channel { |
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| 37 | void *private; /* channel private data */ |
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| 38 | struct ppp_channel_ops *ops; /* operations for this channel */ |
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| 39 | int mtu; /* max transmit packet size */ |
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| 40 | int hdrlen; /* amount of headroom channel needs */ |
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| 41 | void *ppp; /* opaque to channel */ |
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| 42 | /* the following are not used at present */ |
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| 43 | int speed; /* transfer rate (bytes/second) */ |
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| 44 | int latency; /* overhead time in milliseconds */ |
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| 45 | }; |
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| 46 | |||
| 47 | #ifdef __KERNEL__ |
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| 48 | /* Called by the channel when it can send some more data. */ |
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| 49 | extern void ppp_output_wakeup(struct ppp_channel *); |
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| 50 | |||
| 51 | /* Called by the channel to process a received PPP packet. |
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| 52 | The packet should have just the 2-byte PPP protocol header. */ |
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| 53 | extern void ppp_input(struct ppp_channel *, struct sk_buff *); |
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| 54 | |||
| 55 | /* Called by the channel when an input error occurs, indicating |
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| 56 | that we may have missed a packet. */ |
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| 57 | extern void ppp_input_error(struct ppp_channel *, int code); |
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| 58 | |||
| 59 | /* Attach a channel to a given PPP unit. */ |
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| 60 | extern int ppp_register_channel(struct ppp_channel *); |
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| 61 | |||
| 62 | /* Detach a channel from its PPP unit (e.g. on hangup). */ |
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| 63 | extern void ppp_unregister_channel(struct ppp_channel *); |
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| 64 | |||
| 65 | /* Get the channel number for a channel */ |
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| 66 | extern int ppp_channel_index(struct ppp_channel *); |
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| 67 | |||
| 68 | /* Get the unit number associated with a channel, or -1 if none */ |
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| 69 | extern int ppp_unit_number(struct ppp_channel *); |
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| 70 | |||
| 71 | /* |
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| 72 | * SMP locking notes: |
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| 73 | * The channel code must ensure that when it calls ppp_unregister_channel, |
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| 74 | * nothing is executing in any of the procedures above, for that |
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| 75 | * channel. The generic layer will ensure that nothing is executing |
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| 76 | * in the start_xmit and ioctl routines for the channel by the time |
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| 77 | * that ppp_unregister_channel returns. |
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| 78 | */ |
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| 79 | |||
| 80 | #endif /* __KERNEL__ */ |
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| 81 | #endif |