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/*

 *      AX.25 release 037

 *

 *      This code REQUIRES 2.1.15 or higher/ NET3.038

 *

 *      This module:

 *              This module 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.

 *

 *      History

 *      AX.25 028a      Jonathan(G4KLX) New state machine based on SDL diagrams.

 *      AX.25 028b      Jonathan(G4KLX) Extracted AX25 control block from the

 *                                      sock structure.

 *      AX.25 029       Alan(GW4PTS)    Switched to KA9Q constant names.

 *      AX.25 031       Joerg(DL1BKE)   Added DAMA support

 *      AX.25 032       Joerg(DL1BKE)   Fixed DAMA timeout bug

 *      AX.25 033       Jonathan(G4KLX) Modularisation functions.

 *      AX.25 035       Frederic(F1OAT) Support for pseudo-digipeating.

 *      AX.25 036       Jonathan(G4KLX) Split Standard and DAMA code into separate files.

 *                      Joerg(DL1BKE)   Fixed DAMA Slave. We are *required* to start with

 *                                      standard AX.25 mode.

 *      AX.25 037       Jonathan(G4KLX) New timer architecture.

 *                      Tomi(OH2BNS)    Fixed heartbeat expiry (check ax25_dev).

 */

#include <linux/config.h>

#include <linux/errno.h>

#include <linux/types.h>

#include <linux/socket.h>

#include <linux/in.h>

#include <linux/kernel.h>

#include <linux/sched.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 <asm/system.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_start_heartbeat(ax25_cb *ax25)

{

        del_timer(&ax25->timer);

        ax25->timer.data     = (unsigned long)ax25;

        ax25->timer.function = &ax25_heartbeat_expiry;

        ax25->timer.expires  = jiffies + 5 * HZ;

        add_timer(&ax25->timer);

}

void ax25_start_t1timer(ax25_cb *ax25)

{

        del_timer(&ax25->t1timer);

        ax25->t1timer.data     = (unsigned long)ax25;

        ax25->t1timer.function = &ax25_t1timer_expiry;

        ax25->t1timer.expires  = jiffies + ax25->t1;

        add_timer(&ax25->t1timer);

}

void ax25_start_t2timer(ax25_cb *ax25)

{

        del_timer(&ax25->t2timer);

        ax25->t2timer.data     = (unsigned long)ax25;

        ax25->t2timer.function = &ax25_t2timer_expiry;

        ax25->t2timer.expires  = jiffies + ax25->t2;

        add_timer(&ax25->t2timer);

}

void ax25_start_t3timer(ax25_cb *ax25)

{

        del_timer(&ax25->t3timer);

        if (ax25->t3 > 0) {

                ax25->t3timer.data     = (unsigned long)ax25;

                ax25->t3timer.function = &ax25_t3timer_expiry;

                ax25->t3timer.expires  = jiffies + ax25->t3;

                add_timer(&ax25->t3timer);

        }

}

void ax25_start_idletimer(ax25_cb *ax25)

{

        del_timer(&ax25->idletimer);

        if (ax25->idle > 0) {

                ax25->idletimer.data     = (unsigned long)ax25;

                ax25->idletimer.function = &ax25_idletimer_expiry;

                ax25->idletimer.expires  = jiffies + ax25->idle;

                add_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;

}

static void ax25_heartbeat_expiry(unsigned long param)

{

        ax25_cb *ax25 = (ax25_cb *)param;

        int proto = AX25_PROTO_STD_SIMPLEX;

        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

        }

}