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/*
* Definitions for the interface between the generic PPP code
* and a PPP channel.
*
* A PPP channel provides a way for the generic PPP code to send
* and receive packets over some sort of communications medium.
* Packets are stored in sk_buffs and have the 2-byte PPP protocol
* number at the start, but not the address and control bytes.
*
* Copyright 1999 Paul Mackerras.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* ==FILEVERSION 990909==
*/
/* $Id: ppp_channel.h,v 1.2 1999/09/15 11:21:53 paulus Exp $ */
#include <linux/list.h>
#include <linux/skbuff.h>
struct ppp_channel;
struct ppp_channel_ops {
/* Send a packet (or multilink fragment) on this channel.
Returns 1 if it was accepted, 0 if not. */
int (*start_xmit)(struct ppp_channel *, struct sk_buff *);
};
struct ppp_channel {
void *private; /* channel private data */
struct ppp_channel_ops *ops; /* operations for this channel */
int xmit_qlen; /* length of transmit queue (bytes) */
int speed; /* transfer rate (bytes/second) */
int latency; /* overhead time in milliseconds */
int hdrlen; /* amount of headroom channel needs */
struct list_head list; /* link in list of channels per unit */
void *ppp; /* opaque to channel */
};
#ifdef __KERNEL__
/* Called by the channel when it can send some more data. */
extern void ppp_output_wakeup(struct ppp_channel *);
/* Called by the channel to process a received PPP packet.
The packet should have just the 2-byte PPP protocol header. */
extern void ppp_input(struct ppp_channel *, struct sk_buff *);
/* Called by the channel when an input error occurs, indicating
that we may have missed a packet. */
extern void ppp_input_error(struct ppp_channel *, int code);
/* Attach a channel to a given PPP unit. */
extern int ppp_register_channel(struct ppp_channel *, int unit);
/* Detach a channel from its PPP unit (e.g. on hangup). */
extern void ppp_unregister_channel(struct ppp_channel *);
#endif /* __KERNEL__ */
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