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 <asm/uaccess.h>
  32 #include <asm/system.h>
  33 #include <linux/fcntl.h>
  34 #include <linux/mm.h>
  35 #include <linux/interrupt.h>
  36
  37 static void ax25_heartbeat_expiry(unsigned long);
  38 static void ax25_t1timer_expiry(unsigned long);
  39 static void ax25_t2timer_expiry(unsigned long);
  40 static void ax25_t3timer_expiry(unsigned long);
  41 static void ax25_idletimer_expiry(unsigned long);
  42
  43 void ax25_start_heartbeat(ax25_cb *ax25)
  44 {
  45         del_timer(&ax25->timer);
  46
  47         ax25->timer.data     = (unsigned long)ax25;
  48         ax25->timer.function = &ax25_heartbeat_expiry;
  49         ax25->timer.expires  = jiffies + 5 * HZ;
  50
  51         add_timer(&ax25->timer);
  52 }
  53
  54 void ax25_start_t1timer(ax25_cb *ax25)
  55 {
  56         del_timer(&ax25->t1timer);
  57
  58         ax25->t1timer.data     = (unsigned long)ax25;
  59         ax25->t1timer.function = &ax25_t1timer_expiry;
  60         ax25->t1timer.expires  = jiffies + ax25->t1;
  61
  62         add_timer(&ax25->t1timer);
  63 }
  64
  65 void ax25_start_t2timer(ax25_cb *ax25)
  66 {
  67         del_timer(&ax25->t2timer);
  68
  69         ax25->t2timer.data     = (unsigned long)ax25;
  70         ax25->t2timer.function = &ax25_t2timer_expiry;
  71         ax25->t2timer.expires  = jiffies + ax25->t2;
  72
  73         add_timer(&ax25->t2timer);
  74 }
  75
  76 void ax25_start_t3timer(ax25_cb *ax25)
  77 {
  78         del_timer(&ax25->t3timer);
  79
  80         if (ax25->t3 > 0) {
  81                 ax25->t3timer.data     = (unsigned long)ax25;
  82                 ax25->t3timer.function = &ax25_t3timer_expiry;
  83                 ax25->t3timer.expires  = jiffies + ax25->t3;
  84
  85                 add_timer(&ax25->t3timer);
  86         }
  87 }
  88
  89 void ax25_start_idletimer(ax25_cb *ax25)
  90 {
  91         del_timer(&ax25->idletimer);
  92
  93         if (ax25->idle > 0) {
  94                 ax25->idletimer.data     = (unsigned long)ax25;
  95                 ax25->idletimer.function = &ax25_idletimer_expiry;
  96                 ax25->idletimer.expires  = jiffies + ax25->idle;
  97
  98                 add_timer(&ax25->idletimer);
  99         }
 100 }
 101
 102 void ax25_stop_heartbeat(ax25_cb *ax25)
 103 {
 104         del_timer(&ax25->timer);
 105 }
 106
 107 void ax25_stop_t1timer(ax25_cb *ax25)
 108 {
 109         del_timer(&ax25->t1timer);
 110 }
 111
 112 void ax25_stop_t2timer(ax25_cb *ax25)
 113 {
 114         del_timer(&ax25->t2timer);
 115 }
 116
 117 void ax25_stop_t3timer(ax25_cb *ax25)
 118 {
 119         del_timer(&ax25->t3timer);
 120 }
 121
 122 void ax25_stop_idletimer(ax25_cb *ax25)
 123 {
 124         del_timer(&ax25->idletimer);
 125 }
 126
 127 int ax25_t1timer_running(ax25_cb *ax25)
 128 {
 129         return timer_pending(&ax25->t1timer);
 130 }
 131
 132 unsigned long ax25_display_timer(struct timer_list *timer)
 133 {
 134         if (!timer_pending(timer))
 135                 return 0;
 136
 137         return timer->expires - jiffies;
 138 }
 139
 140 EXPORT_SYMBOL(ax25_display_timer);
 141
 142 static void ax25_heartbeat_expiry(unsigned long param)
 143 {
 144         int proto = AX25_PROTO_STD_SIMPLEX;
 145         ax25_cb *ax25 = (ax25_cb *)param;
 146
 147         if (ax25->ax25_dev)
 148                 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
 149
 150         switch (proto) {
 151         case AX25_PROTO_STD_SIMPLEX:
 152         case AX25_PROTO_STD_DUPLEX:
 153                 ax25_std_heartbeat_expiry(ax25);
 154                 break;
 155
 156 #ifdef CONFIG_AX25_DAMA_SLAVE
 157         case AX25_PROTO_DAMA_SLAVE:
 158                 if (ax25->ax25_dev->dama.slave)
 159                         ax25_ds_heartbeat_expiry(ax25);
 160                 else
 161                         ax25_std_heartbeat_expiry(ax25);
 162                 break;
 163 #endif
 164         }
 165 }
 166
 167 static void ax25_t1timer_expiry(unsigned long param)
 168 {
 169         ax25_cb *ax25 = (ax25_cb *)param;
 170
 171         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 172         case AX25_PROTO_STD_SIMPLEX:
 173         case AX25_PROTO_STD_DUPLEX:
 174                 ax25_std_t1timer_expiry(ax25);
 175                 break;
 176
 177 #ifdef CONFIG_AX25_DAMA_SLAVE
 178         case AX25_PROTO_DAMA_SLAVE:
 179                 if (!ax25->ax25_dev->dama.slave)
 180                         ax25_std_t1timer_expiry(ax25);
 181                 break;
 182 #endif
 183         }
 184 }
 185
 186 static void ax25_t2timer_expiry(unsigned long param)
 187 {
 188         ax25_cb *ax25 = (ax25_cb *)param;
 189
 190         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 191         case AX25_PROTO_STD_SIMPLEX:
 192         case AX25_PROTO_STD_DUPLEX:
 193                 ax25_std_t2timer_expiry(ax25);
 194                 break;
 195
 196 #ifdef CONFIG_AX25_DAMA_SLAVE
 197         case AX25_PROTO_DAMA_SLAVE:
 198                 if (!ax25->ax25_dev->dama.slave)
 199                         ax25_std_t2timer_expiry(ax25);
 200                 break;
 201 #endif
 202         }
 203 }
 204
 205 static void ax25_t3timer_expiry(unsigned long param)
 206 {
 207         ax25_cb *ax25 = (ax25_cb *)param;
 208
 209         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 210         case AX25_PROTO_STD_SIMPLEX:
 211         case AX25_PROTO_STD_DUPLEX:
 212                 ax25_std_t3timer_expiry(ax25);
 213                 break;
 214
 215 #ifdef CONFIG_AX25_DAMA_SLAVE
 216         case AX25_PROTO_DAMA_SLAVE:
 217                 if (ax25->ax25_dev->dama.slave)
 218                         ax25_ds_t3timer_expiry(ax25);
 219                 else
 220                         ax25_std_t3timer_expiry(ax25);
 221                 break;
 222 #endif
 223         }
 224 }
 225
 226 static void ax25_idletimer_expiry(unsigned long param)
 227 {
 228         ax25_cb *ax25 = (ax25_cb *)param;
 229
 230         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 231         case AX25_PROTO_STD_SIMPLEX:
 232         case AX25_PROTO_STD_DUPLEX:
 233                 ax25_std_idletimer_expiry(ax25);
 234                 break;
 235
 236 #ifdef CONFIG_AX25_DAMA_SLAVE
 237         case AX25_PROTO_DAMA_SLAVE:
 238                 if (ax25->ax25_dev->dama.slave)
 239                         ax25_ds_idletimer_expiry(ax25);
 240                 else
 241                         ax25_std_idletimer_expiry(ax25);
 242                 break;
 243 #endif
 244         }
 245 }