cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ppp_channel.h (3064B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2#ifndef _PPP_CHANNEL_H_
      3#define _PPP_CHANNEL_H_
      4/*
      5 * Definitions for the interface between the generic PPP code
      6 * and a PPP channel.
      7 *
      8 * A PPP channel provides a way for the generic PPP code to send
      9 * and receive packets over some sort of communications medium.
     10 * Packets are stored in sk_buffs and have the 2-byte PPP protocol
     11 * number at the start, but not the address and control bytes.
     12 *
     13 * Copyright 1999 Paul Mackerras.
     14 *
     15 * ==FILEVERSION 20000322==
     16 */
     17
     18#include <linux/list.h>
     19#include <linux/skbuff.h>
     20#include <linux/poll.h>
     21#include <net/net_namespace.h>
     22
     23struct ppp_channel;
     24
     25struct ppp_channel_ops {
     26	/* Send a packet (or multilink fragment) on this channel.
     27	   Returns 1 if it was accepted, 0 if not. */
     28	int	(*start_xmit)(struct ppp_channel *, struct sk_buff *);
     29	/* Handle an ioctl call that has come in via /dev/ppp. */
     30	int	(*ioctl)(struct ppp_channel *, unsigned int, unsigned long);
     31	int	(*fill_forward_path)(struct net_device_path_ctx *,
     32				     struct net_device_path *,
     33				     const struct ppp_channel *);
     34};
     35
     36struct ppp_channel {
     37	void		*private;	/* channel private data */
     38	const struct ppp_channel_ops *ops; /* operations for this channel */
     39	int		mtu;		/* max transmit packet size */
     40	int		hdrlen;		/* amount of headroom channel needs */
     41	void		*ppp;		/* opaque to channel */
     42	int		speed;		/* transfer rate (bytes/second) */
     43	/* the following is not used at present */
     44	int		latency;	/* overhead time in milliseconds */
     45};
     46
     47#ifdef __KERNEL__
     48/* Called by the channel when it can send some more data. */
     49extern void ppp_output_wakeup(struct ppp_channel *);
     50
     51/* Called by the channel to process a received PPP packet.
     52   The packet should have just the 2-byte PPP protocol header. */
     53extern void ppp_input(struct ppp_channel *, struct sk_buff *);
     54
     55/* Called by the channel when an input error occurs, indicating
     56   that we may have missed a packet. */
     57extern void ppp_input_error(struct ppp_channel *, int code);
     58
     59/* Attach a channel to a given PPP unit in specified net. */
     60extern int ppp_register_net_channel(struct net *, struct ppp_channel *);
     61
     62/* Attach a channel to a given PPP unit. */
     63extern int ppp_register_channel(struct ppp_channel *);
     64
     65/* Detach a channel from its PPP unit (e.g. on hangup). */
     66extern void ppp_unregister_channel(struct ppp_channel *);
     67
     68/* Get the channel number for a channel */
     69extern int ppp_channel_index(struct ppp_channel *);
     70
     71/* Get the unit number associated with a channel, or -1 if none */
     72extern int ppp_unit_number(struct ppp_channel *);
     73
     74/* Get the device name associated with a channel, or NULL if none */
     75extern char *ppp_dev_name(struct ppp_channel *);
     76
     77/*
     78 * SMP locking notes:
     79 * The channel code must ensure that when it calls ppp_unregister_channel,
     80 * nothing is executing in any of the procedures above, for that
     81 * channel.  The generic layer will ensure that nothing is executing
     82 * in the start_xmit and ioctl routines for the channel by the time
     83 * that ppp_unregister_channel returns.
     84 */
     85
     86#endif /* __KERNEL__ */
     87#endif