/* SPDX-License-Identifier: GPL-2.0-or-later */
|
#ifndef _PPP_CHANNEL_H_
|
#define _PPP_CHANNEL_H_
|
/*
|
* 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.
|
*
|
* ==FILEVERSION 20000322==
|
*/
|
|
#include <linux/list.h>
|
#include <linux/skbuff.h>
|
#include <linux/poll.h>
|
#include <net/net_namespace.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 *);
|
/* Handle an ioctl call that has come in via /dev/ppp. */
|
int (*ioctl)(struct ppp_channel *, unsigned int, unsigned long);
|
};
|
|
struct ppp_channel {
|
void *private; /* channel private data */
|
const struct ppp_channel_ops *ops; /* operations for this channel */
|
int mtu; /* max transmit packet size */
|
int hdrlen; /* amount of headroom channel needs */
|
void *ppp; /* opaque to channel */
|
int speed; /* transfer rate (bytes/second) */
|
/* the following is not used at present */
|
int latency; /* overhead time in milliseconds */
|
};
|
|
#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 in specified net. */
|
extern int ppp_register_net_channel(struct net *, struct ppp_channel *);
|
|
/* Attach a channel to a given PPP unit. */
|
extern int ppp_register_channel(struct ppp_channel *);
|
|
/* Detach a channel from its PPP unit (e.g. on hangup). */
|
extern void ppp_unregister_channel(struct ppp_channel *);
|
|
/* Get the channel number for a channel */
|
extern int ppp_channel_index(struct ppp_channel *);
|
|
/* Get the unit number associated with a channel, or -1 if none */
|
extern int ppp_unit_number(struct ppp_channel *);
|
|
/* Get the device name associated with a channel, or NULL if none */
|
extern char *ppp_dev_name(struct ppp_channel *);
|
|
/*
|
* SMP locking notes:
|
* The channel code must ensure that when it calls ppp_unregister_channel,
|
* nothing is executing in any of the procedures above, for that
|
* channel. The generic layer will ensure that nothing is executing
|
* in the start_xmit and ioctl routines for the channel by the time
|
* that ppp_unregister_channel returns.
|
*/
|
|
#endif /* __KERNEL__ */
|
#endif
|
