ax25_timer.c

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/*
 * 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.
 *
 * Copyright (C) Alan Cox GW4PTS ([email protected])
 * Copyright (C) Jonathan Naylor G4KLX ([email protected])
 * Copyright (C) Tomi Manninen OH2BNS ([email protected])
 * Copyright (C) Darryl Miles G7LED ([email protected])
 * Copyright (C) Joerg Reuter DL1BKE ([email protected])
 * Copyright (C) Frederic Rible F1OAT ([email protected])
 * Copyright (C) 2002 Ralf Baechle DO1GRB ([email protected])
 */
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>

static void ax25_heartbeat_expiry(unsigned long);
static void ax25_t1timer_expiry(unsigned long);
static void ax25_t2timer_expiry(unsigned long);
static void ax25_t3timer_expiry(unsigned long);
static void ax25_idletimer_expiry(unsigned long);

void ax25_setup_timers(ax25_cb *ax25)
{
    setup_timer(&ax25->timer, ax25_heartbeat_expiry, (unsigned long)ax25);
    setup_timer(&ax25->t1timer, ax25_t1timer_expiry, (unsigned long)ax25);
    setup_timer(&ax25->t2timer, ax25_t2timer_expiry, (unsigned long)ax25);
    setup_timer(&ax25->t3timer, ax25_t3timer_expiry, (unsigned long)ax25);
    setup_timer(&ax25->idletimer, ax25_idletimer_expiry,
            (unsigned long)ax25);
}

void ax25_start_heartbeat(ax25_cb *ax25)
{
    mod_timer(&ax25->timer, jiffies + 5 * HZ);
}

void ax25_start_t1timer(ax25_cb *ax25)
{
    mod_timer(&ax25->t1timer, jiffies + ax25->t1);
}

void ax25_start_t2timer(ax25_cb *ax25)
{
    mod_timer(&ax25->t2timer, jiffies + ax25->t2);
}

void ax25_start_t3timer(ax25_cb *ax25)
{
    if (ax25->t3 > 0)
        mod_timer(&ax25->t3timer, jiffies + ax25->t3);
    else
        del_timer(&ax25->t3timer);
}

void ax25_start_idletimer(ax25_cb *ax25)
{
    if (ax25->idle > 0)
        mod_timer(&ax25->idletimer, jiffies + ax25->idle);
    else
        del_timer(&ax25->idletimer);
}

void ax25_stop_heartbeat(ax25_cb *ax25)
{
    del_timer(&ax25->timer);
}

void ax25_stop_t1timer(ax25_cb *ax25)
{
    del_timer(&ax25->t1timer);
}

void ax25_stop_t2timer(ax25_cb *ax25)
{
    del_timer(&ax25->t2timer);
}

void ax25_stop_t3timer(ax25_cb *ax25)
{
    del_timer(&ax25->t3timer);
}

void ax25_stop_idletimer(ax25_cb *ax25)
{
    del_timer(&ax25->idletimer);
}

int ax25_t1timer_running(ax25_cb *ax25)
{
    return timer_pending(&ax25->t1timer);
}

unsigned long ax25_display_timer(struct timer_list *timer)
{
    if (!timer_pending(timer))
        return 0;

    return timer->expires - jiffies;
}

EXPORT_SYMBOL(ax25_display_timer);

static void ax25_heartbeat_expiry(unsigned long param)
{
    int proto = AX25_PROTO_STD_SIMPLEX;
    ax25_cb *ax25 = (ax25_cb *)param;

    if (ax25->ax25_dev)
        proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];

    switch (proto) {
    case AX25_PROTO_STD_SIMPLEX:
    case AX25_PROTO_STD_DUPLEX:
        ax25_std_heartbeat_expiry(ax25);
        break;

#ifdef CONFIG_AX25_DAMA_SLAVE
    case AX25_PROTO_DAMA_SLAVE:
        if (ax25->ax25_dev->dama.slave)
            ax25_ds_heartbeat_expiry(ax25);
        else
            ax25_std_heartbeat_expiry(ax25);
        break;
#endif
    }
}

static void ax25_t1timer_expiry(unsigned long param)
{
    ax25_cb *ax25 = (ax25_cb *)param;

    switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
    case AX25_PROTO_STD_SIMPLEX:
    case AX25_PROTO_STD_DUPLEX:
        ax25_std_t1timer_expiry(ax25);
        break;

#ifdef CONFIG_AX25_DAMA_SLAVE
    case AX25_PROTO_DAMA_SLAVE:
        if (!ax25->ax25_dev->dama.slave)
            ax25_std_t1timer_expiry(ax25);
        break;
#endif
    }
}

static void ax25_t2timer_expiry(unsigned long param)
{
    ax25_cb *ax25 = (ax25_cb *)param;

    switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
    case AX25_PROTO_STD_SIMPLEX:
    case AX25_PROTO_STD_DUPLEX:
        ax25_std_t2timer_expiry(ax25);
        break;

#ifdef CONFIG_AX25_DAMA_SLAVE
    case AX25_PROTO_DAMA_SLAVE:
        if (!ax25->ax25_dev->dama.slave)
            ax25_std_t2timer_expiry(ax25);
        break;
#endif
    }
}

static void ax25_t3timer_expiry(unsigned long param)
{
    ax25_cb *ax25 = (ax25_cb *)param;

    switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
    case AX25_PROTO_STD_SIMPLEX:
    case AX25_PROTO_STD_DUPLEX:
        ax25_std_t3timer_expiry(ax25);
        break;

#ifdef CONFIG_AX25_DAMA_SLAVE
    case AX25_PROTO_DAMA_SLAVE:
        if (ax25->ax25_dev->dama.slave)
            ax25_ds_t3timer_expiry(ax25);
        else
            ax25_std_t3timer_expiry(ax25);
        break;
#endif
    }
}

static void ax25_idletimer_expiry(unsigned long param)
{
    ax25_cb *ax25 = (ax25_cb *)param;

    switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
    case AX25_PROTO_STD_SIMPLEX:
    case AX25_PROTO_STD_DUPLEX:
        ax25_std_idletimer_expiry(ax25);
        break;

#ifdef CONFIG_AX25_DAMA_SLAVE
    case AX25_PROTO_DAMA_SLAVE:
        if (ax25->ax25_dev->dama.slave)
            ax25_ds_idletimer_expiry(ax25);
        else
            ax25_std_idletimer_expiry(ax25);
        break;
#endif
    }
}