90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _PPP_CHANNEL_H_
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#define _PPP_CHANNEL_H_
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/*
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* Definitions for the interface between the generic PPP code
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* and a PPP channel.
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*
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* A PPP channel provides a way for the generic PPP code to send
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* and receive packets over some sort of communications medium.
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* Packets are stored in sk_buffs and have the 2-byte PPP protocol
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* number at the start, but not the address and control bytes.
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*
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* Copyright 1999 Paul Mackerras.
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*
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* ==FILEVERSION 20000322==
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*/
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/poll.h>
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#include <net/net_namespace.h>
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struct net_device_path;
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struct net_device_path_ctx;
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struct ppp_channel;
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struct ppp_channel_ops {
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/* Send a packet (or multilink fragment) on this channel.
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Returns 1 if it was accepted, 0 if not. */
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int (*start_xmit)(struct ppp_channel *, struct sk_buff *);
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/* Handle an ioctl call that has come in via /dev/ppp. */
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int (*ioctl)(struct ppp_channel *, unsigned int, unsigned long);
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int (*fill_forward_path)(struct net_device_path_ctx *,
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struct net_device_path *,
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const struct ppp_channel *);
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};
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struct ppp_channel {
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void *private; /* channel private data */
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const struct ppp_channel_ops *ops; /* operations for this channel */
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int mtu; /* max transmit packet size */
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int hdrlen; /* amount of headroom channel needs */
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void *ppp; /* opaque to channel */
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int speed; /* transfer rate (bytes/second) */
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/* the following is not used at present */
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int latency; /* overhead time in milliseconds */
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};
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#ifdef __KERNEL__
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/* Called by the channel when it can send some more data. */
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extern void ppp_output_wakeup(struct ppp_channel *);
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/* Called by the channel to process a received PPP packet.
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The packet should have just the 2-byte PPP protocol header. */
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extern void ppp_input(struct ppp_channel *, struct sk_buff *);
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/* Called by the channel when an input error occurs, indicating
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that we may have missed a packet. */
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extern void ppp_input_error(struct ppp_channel *, int code);
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/* Attach a channel to a given PPP unit in specified net. */
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extern int ppp_register_net_channel(struct net *, struct ppp_channel *);
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/* Attach a channel to a given PPP unit. */
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extern int ppp_register_channel(struct ppp_channel *);
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/* Detach a channel from its PPP unit (e.g. on hangup). */
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extern void ppp_unregister_channel(struct ppp_channel *);
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/* Get the channel number for a channel */
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extern int ppp_channel_index(struct ppp_channel *);
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/* Get the unit number associated with a channel, or -1 if none */
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extern int ppp_unit_number(struct ppp_channel *);
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/* Get the device name associated with a channel, or NULL if none */
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extern char *ppp_dev_name(struct ppp_channel *);
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/*
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* SMP locking notes:
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* The channel code must ensure that when it calls ppp_unregister_channel,
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* nothing is executing in any of the procedures above, for that
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* channel. The generic layer will ensure that nothing is executing
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* in the start_xmit and ioctl routines for the channel by the time
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* that ppp_unregister_channel returns.
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*/
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#endif /* __KERNEL__ */
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#endif
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