/* ************************************************************************** * Copyright (c) 2016, The Linux Foundation. All rights reserved. * Permission to use, copy, modify, and/or distribute this software for * any purpose with or without fee is hereby granted, provided that the * above copyright notice and this permission notice appear in all copies. * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ************************************************************************** */ #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 #include #include #include #include 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); /* Get channel protocol type, one of PX_PROTO_XYZ or specific to * the channel subtype */ int (*get_channel_protocol)(struct ppp_channel *); /* Get channel protocol version */ int (*get_channel_protocol_ver)(struct ppp_channel *); /* Hold the channel from being destroyed */ void (*hold)(struct ppp_channel *); /* Release hold on the channel */ void (*release)(struct ppp_channel *); }; 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__ /* Call this to obtain the underlying protocol of the PPP channel, * e.g. PX_PROTO_OE */ extern int ppp_channel_get_protocol(struct ppp_channel *); /* Call this get protocol version */ extern int ppp_channel_get_proto_version(struct ppp_channel *); /* Call this to hold a channel */ extern bool ppp_channel_hold(struct ppp_channel *); /* Call this to release a hold you have upon a channel */ extern void ppp_channel_release(struct ppp_channel *); /* Release hold on PPP channels */ extern void ppp_release_channels(struct ppp_channel *channels[], unsigned int chan_sz); /* Hold PPP channels for the PPP device */ extern int ppp_hold_channels(struct net_device *dev, struct ppp_channel *channels[], unsigned int chan_sz); /* Test if ppp xmit lock is locked */ extern bool ppp_is_xmit_locked(struct net_device *dev); /* Hold PPP channels for the PPP device */ extern int __ppp_hold_channels(struct net_device *dev, struct ppp_channel *channels[], unsigned int chan_sz); /* Test if the ppp device is a multi-link ppp device */ extern int ppp_is_multilink(struct net_device *dev); /* Test if the ppp device is a multi-link ppp device */ extern int __ppp_is_multilink(struct net_device *dev); /* Update statistics of the PPP net_device by incrementing related * statistics field value with corresponding parameter */ extern void ppp_update_stats(struct net_device *dev, unsigned long rx_packets, unsigned long rx_bytes, unsigned long tx_packets, unsigned long tx_bytes, unsigned long rx_errors, unsigned long tx_errors, unsigned long rx_dropped, unsigned long tx_dropped); /* 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 device index associated with a channel, or 0, if none */ extern int ppp_dev_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