linux/net/x25/x25_link.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	X.25 Packet Layer release 002
 *
 *	This is ALPHA test software. This code may break your machine,
 *	randomly fail to work with new releases, misbehave and/or generally
 *	screw up. It might even work.
 *
 *	This code REQUIRES 2.1.15 or higher
 *
 *	History
 *	X.25 001	Jonathan Naylor	  Started coding.
 *	X.25 002	Jonathan Naylor	  New timer architecture.
 *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities
 *					  negotiation.
 *	2000-09-04	Henner Eisen	  dev_hold() / dev_put() for x25_neigh.
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/uaccess.h>
#include <linux/init.h>
#include <net/x25.h>

LIST_HEAD(…);
DEFINE_RWLOCK(…);

static void x25_t20timer_expiry(struct timer_list *);

static void x25_transmit_restart_confirmation(struct x25_neigh *nb);
static void x25_transmit_restart_request(struct x25_neigh *nb);

/*
 *	Linux set/reset timer routines
 */
static inline void x25_start_t20timer(struct x25_neigh *nb)
{ … }

static void x25_t20timer_expiry(struct timer_list *t)
{ … }

static inline void x25_stop_t20timer(struct x25_neigh *nb)
{ … }

/*
 *	This handles all restart and diagnostic frames.
 */
void x25_link_control(struct sk_buff *skb, struct x25_neigh *nb,
		      unsigned short frametype)
{ … }

/*
 *	This routine is called when a Restart Request is needed
 */
static void x25_transmit_restart_request(struct x25_neigh *nb)
{ … }

/*
 * This routine is called when a Restart Confirmation is needed
 */
static void x25_transmit_restart_confirmation(struct x25_neigh *nb)
{ … }

/*
 *	This routine is called when a Clear Request is needed outside of the context
 *	of a connected socket.
 */
void x25_transmit_clear_request(struct x25_neigh *nb, unsigned int lci,
				unsigned char cause)
{ … }

void x25_transmit_link(struct sk_buff *skb, struct x25_neigh *nb)
{ … }

/*
 *	Called when the link layer has become established.
 */
void x25_link_established(struct x25_neigh *nb)
{ … }

/*
 *	Called when the link layer has terminated, or an establishment
 *	request has failed.
 */

void x25_link_terminated(struct x25_neigh *nb)
{ … }

/*
 *	Add a new device.
 */
void x25_link_device_up(struct net_device *dev)
{ … }

/**
 *	__x25_remove_neigh - remove neighbour from x25_neigh_list
 *	@nb: - neigh to remove
 *
 *	Remove neighbour from x25_neigh_list. If it was there.
 *	Caller must hold x25_neigh_list_lock.
 */
static void __x25_remove_neigh(struct x25_neigh *nb)
{ … }

/*
 *	A device has been removed, remove its links.
 */
void x25_link_device_down(struct net_device *dev)
{ … }

/*
 *	Given a device, return the neighbour address.
 */
struct x25_neigh *x25_get_neigh(struct net_device *dev)
{ … }

/*
 *	Handle the ioctls that control the subscription functions.
 */
int x25_subscr_ioctl(unsigned int cmd, void __user *arg)
{ … }


/*
 *	Release all memory associated with X.25 neighbour structures.
 */
void __exit x25_link_free(void)
{ … }