]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/ppp_channel.h
1 #ifndef _PPP_CHANNEL_H_
2 #define _PPP_CHANNEL_H_
4 * Definitions for the interface between the generic PPP code
7 * A PPP channel provides a way for the generic PPP code to send
8 * and receive packets over some sort of communications medium.
9 * Packets are stored in sk_buffs and have the 2-byte PPP protocol
10 * number at the start, but not the address and control bytes.
12 * Copyright 1999 Paul Mackerras.
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
19 * ==FILEVERSION 20000322==
22 #include <linux/list.h>
23 #include <linux/skbuff.h>
24 #include <linux/poll.h>
25 #include <net/net_namespace.h>
29 struct ppp_channel_ops
{
30 /* Send a packet (or multilink fragment) on this channel.
31 Returns 1 if it was accepted, 0 if not. */
32 int (*start_xmit
)(struct ppp_channel
*, struct sk_buff
*);
33 /* Handle an ioctl call that has come in via /dev/ppp. */
34 int (*ioctl
)(struct ppp_channel
*, unsigned int, unsigned long);
38 void *private; /* channel private data */
39 const struct ppp_channel_ops
*ops
; /* operations for this channel */
40 int mtu
; /* max transmit packet size */
41 int hdrlen
; /* amount of headroom channel needs */
42 void *ppp
; /* opaque to channel */
43 int speed
; /* transfer rate (bytes/second) */
44 /* the following is not used at present */
45 int latency
; /* overhead time in milliseconds */
49 /* Called by the channel when it can send some more data. */
50 extern void ppp_output_wakeup(struct ppp_channel
*);
52 /* Called by the channel to process a received PPP packet.
53 The packet should have just the 2-byte PPP protocol header. */
54 extern void ppp_input(struct ppp_channel
*, struct sk_buff
*);
56 /* Called by the channel when an input error occurs, indicating
57 that we may have missed a packet. */
58 extern void ppp_input_error(struct ppp_channel
*, int code
);
60 /* Attach a channel to a given PPP unit in specified net. */
61 extern int ppp_register_net_channel(struct net
*, struct ppp_channel
*);
63 /* Attach a channel to a given PPP unit. */
64 extern int ppp_register_channel(struct ppp_channel
*);
66 /* Detach a channel from its PPP unit (e.g. on hangup). */
67 extern void ppp_unregister_channel(struct ppp_channel
*);
69 /* Get the channel number for a channel */
70 extern int ppp_channel_index(struct ppp_channel
*);
72 /* Get the unit number associated with a channel, or -1 if none */
73 extern int ppp_unit_number(struct ppp_channel
*);
75 /* Get the device name associated with a channel, or NULL if none */
76 extern char *ppp_dev_name(struct ppp_channel
*);
80 * The channel code must ensure that when it calls ppp_unregister_channel,
81 * nothing is executing in any of the procedures above, for that
82 * channel. The generic layer will ensure that nothing is executing
83 * in the start_xmit and ioctl routines for the channel by the time
84 * that ppp_unregister_channel returns.
87 #endif /* __KERNEL__ */