diff options
Diffstat (limited to 'kernel/include/linux/ppp_channel.h')
| -rw-r--r-- | kernel/include/linux/ppp_channel.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/kernel/include/linux/ppp_channel.h b/kernel/include/linux/ppp_channel.h new file mode 100644 index 000000000..5d87f810a --- /dev/null +++ b/kernel/include/linux/ppp_channel.h @@ -0,0 +1,88 @@ +#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 |