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1 | #ifndef _PPP_CHANNEL_H_ |
2 | #define _PPP_CHANNEL_H_ |
3 | /* |
4 | * Definitions for the interface between the generic PPP code |
5 | * and a PPP channel. |
6 | * |
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. |
11 | * |
12 | * Copyright 1999 Paul Mackerras. |
13 | * |
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. |
18 | * |
19 | * ==FILEVERSION 20000322== |
20 | */ |
21 | |
22 | #include <linux/list.h> |
23 | #include <linux/skbuff.h> |
24 | #include <linux/poll.h> |
25 | #include <net/net_namespace.h> |
26 | |
27 | struct ppp_channel; |
28 | |
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); |
35 | }; |
36 | |
37 | struct ppp_channel { |
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 */ |
46 | }; |
47 | |
48 | #ifdef __KERNEL__ |
49 | /* Called by the channel when it can send some more data. */ |
50 | extern void ppp_output_wakeup(struct ppp_channel *); |
51 | |
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 *); |
55 | |
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); |
59 | |
60 | /* Attach a channel to a given PPP unit in specified net. */ |
61 | extern int ppp_register_net_channel(struct net *, struct ppp_channel *); |
62 | |
63 | /* Attach a channel to a given PPP unit. */ |
64 | extern int ppp_register_channel(struct ppp_channel *); |
65 | |
66 | /* Detach a channel from its PPP unit (e.g. on hangup). */ |
67 | extern void ppp_unregister_channel(struct ppp_channel *); |
68 | |
69 | /* Get the channel number for a channel */ |
70 | extern int ppp_channel_index(struct ppp_channel *); |
71 | |
72 | /* Get the unit number associated with a channel, or -1 if none */ |
73 | extern int ppp_unit_number(struct ppp_channel *); |
74 | |
75 | /* Get the device name associated with a channel, or NULL if none */ |
76 | extern char *ppp_dev_name(struct ppp_channel *); |
77 | |
78 | /* |
79 | * SMP locking notes: |
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. |
85 | */ |
86 | |
87 | #endif /* __KERNEL__ */ |
88 | #endif |
89 |
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