You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
3.1 KiB
88 lines
3.1 KiB
#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. |
|
* |
|
* 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 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
|
|
|