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/*
* ROSE release 003
*
* 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
* ROSE 001 Jonathan(G4KLX) Cloned from nr_timer.c
* ROSE 003 Jonathan(G4KLX) New timer architecture.
* Implemented idle timer.
*/
#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/segment.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>
static void rose_heartbeat_expiry(unsigned long);
static void rose_timer_expiry(unsigned long);
static void rose_idletimer_expiry(unsigned long);
void rose_start_heartbeat(struct sock *sk)
{
del_timer(&sk->timer);
sk->timer.data = (unsigned long)sk;
sk->timer.function = &rose_heartbeat_expiry;
sk->timer.expires = jiffies + 5 * HZ;
add_timer(&sk->timer);
}
void rose_start_t1timer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->timer);
sk->protinfo.rose->timer.data = (unsigned long)sk;
sk->protinfo.rose->timer.function = &rose_timer_expiry;
sk->protinfo.rose->timer.expires = jiffies + sk->protinfo.rose->t1;
add_timer(&sk->protinfo.rose->timer);
}
void rose_start_t2timer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->timer);
sk->protinfo.rose->timer.data = (unsigned long)sk;
sk->protinfo.rose->timer.function = &rose_timer_expiry;
sk->protinfo.rose->timer.expires = jiffies + sk->protinfo.rose->t2;
add_timer(&sk->protinfo.rose->timer);
}
void rose_start_t3timer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->timer);
sk->protinfo.rose->timer.data = (unsigned long)sk;
sk->protinfo.rose->timer.function = &rose_timer_expiry;
sk->protinfo.rose->timer.expires = jiffies + sk->protinfo.rose->t3;
add_timer(&sk->protinfo.rose->timer);
}
void rose_start_hbtimer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->timer);
sk->protinfo.rose->timer.data = (unsigned long)sk;
sk->protinfo.rose->timer.function = &rose_timer_expiry;
sk->protinfo.rose->timer.expires = jiffies + sk->protinfo.rose->hb;
add_timer(&sk->protinfo.rose->timer);
}
void rose_start_idletimer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->idletimer);
if (sk->protinfo.rose->idle > 0) {
sk->protinfo.rose->idletimer.data = (unsigned long)sk;
sk->protinfo.rose->idletimer.function = &rose_idletimer_expiry;
sk->protinfo.rose->idletimer.expires = jiffies + sk->protinfo.rose->idle;
add_timer(&sk->protinfo.rose->idletimer);
}
}
void rose_stop_heartbeat(struct sock *sk)
{
del_timer(&sk->timer);
}
void rose_stop_timer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->timer);
}
void rose_stop_idletimer(struct sock *sk)
{
del_timer(&sk->protinfo.rose->idletimer);
}
static void rose_heartbeat_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
switch (sk->protinfo.rose->state) {
case ROSE_STATE_0:
/* Magic here: If we listen() and a new link dies before it
is accepted() it isn't 'dead' so doesn't get removed. */
if (sk->destroy || (sk->state == TCP_LISTEN && sk->dead)) {
rose_destroy_socket(sk);
return;
}
break;
case ROSE_STATE_3:
/*
* Check for the state of the receive buffer.
*/
if (atomic_read(&sk->rmem_alloc) < (sk->rcvbuf / 2) &&
(sk->protinfo.rose->condition & ROSE_COND_OWN_RX_BUSY)) {
sk->protinfo.rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING;
sk->protinfo.rose->vl = sk->protinfo.rose->vr;
rose_write_internal(sk, ROSE_RR);
rose_stop_timer(sk); /* HB */
break;
}
break;
}
rose_start_heartbeat(sk);
}
static void rose_timer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
switch (sk->protinfo.rose->state) {
case ROSE_STATE_1: /* T1 */
case ROSE_STATE_4: /* T2 */
rose_write_internal(sk, ROSE_CLEAR_REQUEST);
sk->protinfo.rose->state = ROSE_STATE_2;
rose_start_t3timer(sk);
break;
case ROSE_STATE_2: /* T3 */
sk->protinfo.rose->neighbour->use--;
rose_disconnect(sk, ETIMEDOUT, -1, -1);
break;
case ROSE_STATE_3: /* HB */
if (sk->protinfo.rose->condition & ROSE_COND_ACK_PENDING) {
sk->protinfo.rose->condition &= ~ROSE_COND_ACK_PENDING;
rose_enquiry_response(sk);
}
break;
}
}
static void rose_idletimer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
rose_clear_queues(sk);
rose_write_internal(sk, ROSE_CLEAR_REQUEST);
sk->protinfo.rose->state = ROSE_STATE_2;
rose_start_t3timer(sk);
sk->state = TCP_CLOSE;
sk->err = 0;
sk->shutdown |= SEND_SHUTDOWN;
if (!sk->dead)
sk->state_change(sk);
sk->dead = 1;
}
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