linux/net/rose/rose_timer.c
<<
>>
Prefs
   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License as published by
   4 * the Free Software Foundation; either version 2 of the License, or
   5 * (at your option) any later version.
   6 *
   7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   8 * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
   9 */
  10#include <linux/errno.h>
  11#include <linux/types.h>
  12#include <linux/socket.h>
  13#include <linux/in.h>
  14#include <linux/kernel.h>
  15#include <linux/jiffies.h>
  16#include <linux/timer.h>
  17#include <linux/string.h>
  18#include <linux/sockios.h>
  19#include <linux/net.h>
  20#include <net/ax25.h>
  21#include <linux/inet.h>
  22#include <linux/netdevice.h>
  23#include <linux/skbuff.h>
  24#include <net/sock.h>
  25#include <net/tcp_states.h>
  26#include <linux/fcntl.h>
  27#include <linux/mm.h>
  28#include <linux/interrupt.h>
  29#include <net/rose.h>
  30
  31static void rose_heartbeat_expiry(unsigned long);
  32static void rose_timer_expiry(unsigned long);
  33static void rose_idletimer_expiry(unsigned long);
  34
  35void rose_start_heartbeat(struct sock *sk)
  36{
  37        del_timer(&sk->sk_timer);
  38
  39        sk->sk_timer.data     = (unsigned long)sk;
  40        sk->sk_timer.function = &rose_heartbeat_expiry;
  41        sk->sk_timer.expires  = jiffies + 5 * HZ;
  42
  43        add_timer(&sk->sk_timer);
  44}
  45
  46void rose_start_t1timer(struct sock *sk)
  47{
  48        struct rose_sock *rose = rose_sk(sk);
  49
  50        del_timer(&rose->timer);
  51
  52        rose->timer.data     = (unsigned long)sk;
  53        rose->timer.function = &rose_timer_expiry;
  54        rose->timer.expires  = jiffies + rose->t1;
  55
  56        add_timer(&rose->timer);
  57}
  58
  59void rose_start_t2timer(struct sock *sk)
  60{
  61        struct rose_sock *rose = rose_sk(sk);
  62
  63        del_timer(&rose->timer);
  64
  65        rose->timer.data     = (unsigned long)sk;
  66        rose->timer.function = &rose_timer_expiry;
  67        rose->timer.expires  = jiffies + rose->t2;
  68
  69        add_timer(&rose->timer);
  70}
  71
  72void rose_start_t3timer(struct sock *sk)
  73{
  74        struct rose_sock *rose = rose_sk(sk);
  75
  76        del_timer(&rose->timer);
  77
  78        rose->timer.data     = (unsigned long)sk;
  79        rose->timer.function = &rose_timer_expiry;
  80        rose->timer.expires  = jiffies + rose->t3;
  81
  82        add_timer(&rose->timer);
  83}
  84
  85void rose_start_hbtimer(struct sock *sk)
  86{
  87        struct rose_sock *rose = rose_sk(sk);
  88
  89        del_timer(&rose->timer);
  90
  91        rose->timer.data     = (unsigned long)sk;
  92        rose->timer.function = &rose_timer_expiry;
  93        rose->timer.expires  = jiffies + rose->hb;
  94
  95        add_timer(&rose->timer);
  96}
  97
  98void rose_start_idletimer(struct sock *sk)
  99{
 100        struct rose_sock *rose = rose_sk(sk);
 101
 102        del_timer(&rose->idletimer);
 103
 104        if (rose->idle > 0) {
 105                rose->idletimer.data     = (unsigned long)sk;
 106                rose->idletimer.function = &rose_idletimer_expiry;
 107                rose->idletimer.expires  = jiffies + rose->idle;
 108
 109                add_timer(&rose->idletimer);
 110        }
 111}
 112
 113void rose_stop_heartbeat(struct sock *sk)
 114{
 115        del_timer(&sk->sk_timer);
 116}
 117
 118void rose_stop_timer(struct sock *sk)
 119{
 120        del_timer(&rose_sk(sk)->timer);
 121}
 122
 123void rose_stop_idletimer(struct sock *sk)
 124{
 125        del_timer(&rose_sk(sk)->idletimer);
 126}
 127
 128static void rose_heartbeat_expiry(unsigned long param)
 129{
 130        struct sock *sk = (struct sock *)param;
 131        struct rose_sock *rose = rose_sk(sk);
 132
 133        bh_lock_sock(sk);
 134        switch (rose->state) {
 135        case ROSE_STATE_0:
 136                /* Magic here: If we listen() and a new link dies before it
 137                   is accepted() it isn't 'dead' so doesn't get removed. */
 138                if (sock_flag(sk, SOCK_DESTROY) ||
 139                    (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
 140                        bh_unlock_sock(sk);
 141                        rose_destroy_socket(sk);
 142                        return;
 143                }
 144                break;
 145
 146        case ROSE_STATE_3:
 147                /*
 148                 * Check for the state of the receive buffer.
 149                 */
 150                if (atomic_read(&sk->sk_rmem_alloc) < (sk->sk_rcvbuf / 2) &&
 151                    (rose->condition & ROSE_COND_OWN_RX_BUSY)) {
 152                        rose->condition &= ~ROSE_COND_OWN_RX_BUSY;
 153                        rose->condition &= ~ROSE_COND_ACK_PENDING;
 154                        rose->vl         = rose->vr;
 155                        rose_write_internal(sk, ROSE_RR);
 156                        rose_stop_timer(sk);    /* HB */
 157                        break;
 158                }
 159                break;
 160        }
 161
 162        rose_start_heartbeat(sk);
 163        bh_unlock_sock(sk);
 164}
 165
 166static void rose_timer_expiry(unsigned long param)
 167{
 168        struct sock *sk = (struct sock *)param;
 169        struct rose_sock *rose = rose_sk(sk);
 170
 171        bh_lock_sock(sk);
 172        switch (rose->state) {
 173        case ROSE_STATE_1:      /* T1 */
 174        case ROSE_STATE_4:      /* T2 */
 175                rose_write_internal(sk, ROSE_CLEAR_REQUEST);
 176                rose->state = ROSE_STATE_2;
 177                rose_start_t3timer(sk);
 178                break;
 179
 180        case ROSE_STATE_2:      /* T3 */
 181                rose->neighbour->use--;
 182                rose_disconnect(sk, ETIMEDOUT, -1, -1);
 183                break;
 184
 185        case ROSE_STATE_3:      /* HB */
 186                if (rose->condition & ROSE_COND_ACK_PENDING) {
 187                        rose->condition &= ~ROSE_COND_ACK_PENDING;
 188                        rose_enquiry_response(sk);
 189                }
 190                break;
 191        }
 192        bh_unlock_sock(sk);
 193}
 194
 195static void rose_idletimer_expiry(unsigned long param)
 196{
 197        struct sock *sk = (struct sock *)param;
 198
 199        bh_lock_sock(sk);
 200        rose_clear_queues(sk);
 201
 202        rose_write_internal(sk, ROSE_CLEAR_REQUEST);
 203        rose_sk(sk)->state = ROSE_STATE_2;
 204
 205        rose_start_t3timer(sk);
 206
 207        sk->sk_state     = TCP_CLOSE;
 208        sk->sk_err       = 0;
 209        sk->sk_shutdown |= SEND_SHUTDOWN;
 210
 211        if (!sock_flag(sk, SOCK_DEAD)) {
 212                sk->sk_state_change(sk);
 213                sock_set_flag(sk, SOCK_DEAD);
 214        }
 215        bh_unlock_sock(sk);
 216}
 217
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.