- /*
- * 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;
- }