net/ax25/ax25_timer.c

   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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   8  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   9  * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
  10  * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
  11  * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
  12  * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
  13  * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
  14  */
  15 #include <linux/errno.h>
  16 #include <linux/types.h>
  17 #include <linux/socket.h>
  18 #include <linux/in.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/timer.h>
  23 #include <linux/string.h>
  24 #include <linux/sockios.h>
  25 #include <linux/net.h>
  26 #include <net/ax25.h>
  27 #include <linux/inet.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/skbuff.h>
  30 #include <net/sock.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/mm.h>
  34 #include <linux/interrupt.h>
  35
  36 static void ax25_heartbeat_expiry(struct timer_list *);
  37 static void ax25_t1timer_expiry(struct timer_list *);
  38 static void ax25_t2timer_expiry(struct timer_list *);
  39 static void ax25_t3timer_expiry(struct timer_list *);
  40 static void ax25_idletimer_expiry(struct timer_list *);
  41
  42 void ax25_setup_timers(ax25_cb *ax25)
  43 {
  44         timer_setup(&ax25->timer, ax25_heartbeat_expiry, 0);
  45         timer_setup(&ax25->t1timer, ax25_t1timer_expiry, 0);
  46         timer_setup(&ax25->t2timer, ax25_t2timer_expiry, 0);
  47         timer_setup(&ax25->t3timer, ax25_t3timer_expiry, 0);
  48         timer_setup(&ax25->idletimer, ax25_idletimer_expiry, 0);
  49 }
  50
  51 void ax25_start_heartbeat(ax25_cb *ax25)
  52 {
  53         mod_timer(&ax25->timer, jiffies + 5 * HZ);
  54 }
  55
  56 void ax25_start_t1timer(ax25_cb *ax25)
  57 {
  58         mod_timer(&ax25->t1timer, jiffies + ax25->t1);
  59 }
  60
  61 void ax25_start_t2timer(ax25_cb *ax25)
  62 {
  63         mod_timer(&ax25->t2timer, jiffies + ax25->t2);
  64 }
  65
  66 void ax25_start_t3timer(ax25_cb *ax25)
  67 {
  68         if (ax25->t3 > 0)
  69                 mod_timer(&ax25->t3timer, jiffies + ax25->t3);
  70         else
  71                 del_timer(&ax25->t3timer);
  72 }
  73
  74 void ax25_start_idletimer(ax25_cb *ax25)
  75 {
  76         if (ax25->idle > 0)
  77                 mod_timer(&ax25->idletimer, jiffies + ax25->idle);
  78         else
  79                 del_timer(&ax25->idletimer);
  80 }
  81
  82 void ax25_stop_heartbeat(ax25_cb *ax25)
  83 {
  84         del_timer(&ax25->timer);
  85 }
  86
  87 void ax25_stop_t1timer(ax25_cb *ax25)
  88 {
  89         del_timer(&ax25->t1timer);
  90 }
  91
  92 void ax25_stop_t2timer(ax25_cb *ax25)
  93 {
  94         del_timer(&ax25->t2timer);
  95 }
  96
  97 void ax25_stop_t3timer(ax25_cb *ax25)
  98 {
  99         del_timer(&ax25->t3timer);
 100 }
 101
 102 void ax25_stop_idletimer(ax25_cb *ax25)
 103 {
 104         del_timer(&ax25->idletimer);
 105 }
 106
 107 int ax25_t1timer_running(ax25_cb *ax25)
 108 {
 109         return timer_pending(&ax25->t1timer);
 110 }
 111
 112 unsigned long ax25_display_timer(struct timer_list *timer)
 113 {
 114         if (!timer_pending(timer))
 115                 return 0;
 116
 117         return timer->expires - jiffies;
 118 }
 119
 120 EXPORT_SYMBOL(ax25_display_timer);
 121
 122 static void ax25_heartbeat_expiry(struct timer_list *t)
 123 {
 124         int proto = AX25_PROTO_STD_SIMPLEX;
 125         ax25_cb *ax25 = from_timer(ax25, t, timer);
 126
 127         if (ax25->ax25_dev)
 128                 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
 129
 130         switch (proto) {
 131         case AX25_PROTO_STD_SIMPLEX:
 132         case AX25_PROTO_STD_DUPLEX:
 133                 ax25_std_heartbeat_expiry(ax25);
 134                 break;
 135
 136 #ifdef CONFIG_AX25_DAMA_SLAVE
 137         case AX25_PROTO_DAMA_SLAVE:
 138                 if (ax25->ax25_dev->dama.slave)
 139                         ax25_ds_heartbeat_expiry(ax25);
 140                 else
 141                         ax25_std_heartbeat_expiry(ax25);
 142                 break;
 143 #endif
 144         }
 145 }
 146
 147 static void ax25_t1timer_expiry(struct timer_list *t)
 148 {
 149         ax25_cb *ax25 = from_timer(ax25, t, t1timer);
 150
 151         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 152         case AX25_PROTO_STD_SIMPLEX:
 153         case AX25_PROTO_STD_DUPLEX:
 154                 ax25_std_t1timer_expiry(ax25);
 155                 break;
 156
 157 #ifdef CONFIG_AX25_DAMA_SLAVE
 158         case AX25_PROTO_DAMA_SLAVE:
 159                 if (!ax25->ax25_dev->dama.slave)
 160                         ax25_std_t1timer_expiry(ax25);
 161                 break;
 162 #endif
 163         }
 164 }
 165
 166 static void ax25_t2timer_expiry(struct timer_list *t)
 167 {
 168         ax25_cb *ax25 = from_timer(ax25, t, t2timer);
 169
 170         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 171         case AX25_PROTO_STD_SIMPLEX:
 172         case AX25_PROTO_STD_DUPLEX:
 173                 ax25_std_t2timer_expiry(ax25);
 174                 break;
 175
 176 #ifdef CONFIG_AX25_DAMA_SLAVE
 177         case AX25_PROTO_DAMA_SLAVE:
 178                 if (!ax25->ax25_dev->dama.slave)
 179                         ax25_std_t2timer_expiry(ax25);
 180                 break;
 181 #endif
 182         }
 183 }
 184
 185 static void ax25_t3timer_expiry(struct timer_list *t)
 186 {
 187         ax25_cb *ax25 = from_timer(ax25, t, t3timer);
 188
 189         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 190         case AX25_PROTO_STD_SIMPLEX:
 191         case AX25_PROTO_STD_DUPLEX:
 192                 ax25_std_t3timer_expiry(ax25);
 193                 break;
 194
 195 #ifdef CONFIG_AX25_DAMA_SLAVE
 196         case AX25_PROTO_DAMA_SLAVE:
 197                 if (ax25->ax25_dev->dama.slave)
 198                         ax25_ds_t3timer_expiry(ax25);
 199                 else
 200                         ax25_std_t3timer_expiry(ax25);
 201                 break;
 202 #endif
 203         }
 204 }
 205
 206 static void ax25_idletimer_expiry(struct timer_list *t)
 207 {
 208         ax25_cb *ax25 = from_timer(ax25, t, idletimer);
 209
 210         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 211         case AX25_PROTO_STD_SIMPLEX:
 212         case AX25_PROTO_STD_DUPLEX:
 213                 ax25_std_idletimer_expiry(ax25);
 214                 break;
 215
 216 #ifdef CONFIG_AX25_DAMA_SLAVE
 217         case AX25_PROTO_DAMA_SLAVE:
 218                 if (ax25->ax25_dev->dama.slave)
 219                         ax25_ds_idletimer_expiry(ax25);
 220                 else
 221                         ax25_std_idletimer_expiry(ax25);
 222                 break;
 223 #endif
 224         }
 225 }