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/*
* NET/ROM release 007
*
* 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
* NET/ROM 001 Jonathan(G4KLX) Cloned from ax25_timer.c
* NET/ROM 007 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/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/netrom.h>
static void nr_heartbeat_expiry(unsigned long);
static void nr_t1timer_expiry(unsigned long);
static void nr_t2timer_expiry(unsigned long);
static void nr_t4timer_expiry(unsigned long);
static void nr_idletimer_expiry(unsigned long);
void nr_start_t1timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t1timer);
sk->protinfo.nr->t1timer.data = (unsigned long)sk;
sk->protinfo.nr->t1timer.function = &nr_t1timer_expiry;
sk->protinfo.nr->t1timer.expires = jiffies + sk->protinfo.nr->t1;
add_timer(&sk->protinfo.nr->t1timer);
}
void nr_start_t2timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t2timer);
sk->protinfo.nr->t2timer.data = (unsigned long)sk;
sk->protinfo.nr->t2timer.function = &nr_t2timer_expiry;
sk->protinfo.nr->t2timer.expires = jiffies + sk->protinfo.nr->t2;
add_timer(&sk->protinfo.nr->t2timer);
}
void nr_start_t4timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t4timer);
sk->protinfo.nr->t4timer.data = (unsigned long)sk;
sk->protinfo.nr->t4timer.function = &nr_t4timer_expiry;
sk->protinfo.nr->t4timer.expires = jiffies + sk->protinfo.nr->t4;
add_timer(&sk->protinfo.nr->t4timer);
}
void nr_start_idletimer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->idletimer);
if (sk->protinfo.nr->idle > 0) {
sk->protinfo.nr->idletimer.data = (unsigned long)sk;
sk->protinfo.nr->idletimer.function = &nr_idletimer_expiry;
sk->protinfo.nr->idletimer.expires = jiffies + sk->protinfo.nr->idle;
add_timer(&sk->protinfo.nr->idletimer);
}
}
void nr_start_heartbeat(struct sock *sk)
{
del_timer(&sk->timer);
sk->timer.data = (unsigned long)sk;
sk->timer.function = &nr_heartbeat_expiry;
sk->timer.expires = jiffies + 5 * HZ;
add_timer(&sk->timer);
}
void nr_stop_t1timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t1timer);
}
void nr_stop_t2timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t2timer);
}
void nr_stop_t4timer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->t4timer);
}
void nr_stop_idletimer(struct sock *sk)
{
del_timer(&sk->protinfo.nr->idletimer);
}
void nr_stop_heartbeat(struct sock *sk)
{
del_timer(&sk->timer);
}
int nr_t1timer_running(struct sock *sk)
{
return timer_pending(&sk->protinfo.nr->t1timer);
}
static void nr_heartbeat_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
switch (sk->protinfo.nr->state) {
case NR_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)) {
nr_destroy_socket(sk);
return;
}
break;
case NR_STATE_3:
/*
* Check for the state of the receive buffer.
*/
if (atomic_read(&sk->rmem_alloc) < (sk->rcvbuf / 2) &&
(sk->protinfo.nr->condition & NR_COND_OWN_RX_BUSY)) {
sk->protinfo.nr->condition &= ~NR_COND_OWN_RX_BUSY;
sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
sk->protinfo.nr->vl = sk->protinfo.nr->vr;
nr_write_internal(sk, NR_INFOACK);
break;
}
break;
}
nr_start_heartbeat(sk);
}
static void nr_t2timer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
if (sk->protinfo.nr->condition & NR_COND_ACK_PENDING) {
sk->protinfo.nr->condition &= ~NR_COND_ACK_PENDING;
nr_enquiry_response(sk);
}
}
static void nr_t4timer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
sk->protinfo.nr->condition &= ~NR_COND_PEER_RX_BUSY;
}
static void nr_idletimer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
nr_clear_queues(sk);
sk->protinfo.nr->n2count = 0;
nr_write_internal(sk, NR_DISCREQ);
sk->protinfo.nr->state = NR_STATE_2;
nr_start_t1timer(sk);
nr_stop_t2timer(sk);
nr_stop_t4timer(sk);
sk->state = TCP_CLOSE;
sk->err = 0;
sk->shutdown |= SEND_SHUTDOWN;
if (!sk->dead)
sk->state_change(sk);
sk->dead = 1;
}
static void nr_t1timer_expiry(unsigned long param)
{
struct sock *sk = (struct sock *)param;
switch (sk->protinfo.nr->state) {
case NR_STATE_1:
if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
return;
} else {
sk->protinfo.nr->n2count++;
nr_write_internal(sk, NR_CONNREQ);
}
break;
case NR_STATE_2:
if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
return;
} else {
sk->protinfo.nr->n2count++;
nr_write_internal(sk, NR_DISCREQ);
}
break;
case NR_STATE_3:
if (sk->protinfo.nr->n2count == sk->protinfo.nr->n2) {
nr_disconnect(sk, ETIMEDOUT);
return;
} else {
sk->protinfo.nr->n2count++;
nr_requeue_frames(sk);
}
break;
}
nr_start_t1timer(sk);
}
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