net/ax25/ax25_timer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
   5  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   6  * Copyright (C) Tomi Manninen OH2BNS (oh2bns@sral.fi)
   7  * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
   8  * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
   9  * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
  10  * Copyright (C) 2002 Ralf Baechle DO1GRB (ralf@gnu.org)
  11  */
  12 #include <linux/errno.h>
  13 #include <linux/types.h>
  14 #include <linux/socket.h>
  15 #include <linux/in.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/timer.h>
  20 #include <linux/string.h>
  21 #include <linux/sockios.h>
  22 #include <linux/net.h>
  23 #include <net/ax25.h>
  24 #include <linux/inet.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <net/sock.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/mm.h>
  31 #include <linux/interrupt.h>
  32
  33 static void ax25_heartbeat_expiry(struct timer_list *);
  34 static void ax25_t1timer_expiry(struct timer_list *);
  35 static void ax25_t2timer_expiry(struct timer_list *);
  36 static void ax25_t3timer_expiry(struct timer_list *);
  37 static void ax25_idletimer_expiry(struct timer_list *);
  38
  39 void ax25_setup_timers(ax25_cb *ax25)
  40 {
  41         timer_setup(&ax25->timer, ax25_heartbeat_expiry, 0);
  42         timer_setup(&ax25->t1timer, ax25_t1timer_expiry, 0);
  43         timer_setup(&ax25->t2timer, ax25_t2timer_expiry, 0);
  44         timer_setup(&ax25->t3timer, ax25_t3timer_expiry, 0);
  45         timer_setup(&ax25->idletimer, ax25_idletimer_expiry, 0);
  46 }
  47
  48 void ax25_start_heartbeat(ax25_cb *ax25)
  49 {
  50         mod_timer(&ax25->timer, jiffies + 5 * HZ);
  51 }
  52
  53 void ax25_start_t1timer(ax25_cb *ax25)
  54 {
  55         mod_timer(&ax25->t1timer, jiffies + ax25->t1);
  56 }
  57
  58 void ax25_start_t2timer(ax25_cb *ax25)
  59 {
  60         mod_timer(&ax25->t2timer, jiffies + ax25->t2);
  61 }
  62
  63 void ax25_start_t3timer(ax25_cb *ax25)
  64 {
  65         if (ax25->t3 > 0)
  66                 mod_timer(&ax25->t3timer, jiffies + ax25->t3);
  67         else
  68                 del_timer(&ax25->t3timer);
  69 }
  70
  71 void ax25_start_idletimer(ax25_cb *ax25)
  72 {
  73         if (ax25->idle > 0)
  74                 mod_timer(&ax25->idletimer, jiffies + ax25->idle);
  75         else
  76                 del_timer(&ax25->idletimer);
  77 }
  78
  79 void ax25_stop_heartbeat(ax25_cb *ax25)
  80 {
  81         del_timer(&ax25->timer);
  82 }
  83
  84 void ax25_stop_t1timer(ax25_cb *ax25)
  85 {
  86         del_timer(&ax25->t1timer);
  87 }
  88
  89 void ax25_stop_t2timer(ax25_cb *ax25)
  90 {
  91         del_timer(&ax25->t2timer);
  92 }
  93
  94 void ax25_stop_t3timer(ax25_cb *ax25)
  95 {
  96         del_timer(&ax25->t3timer);
  97 }
  98
  99 void ax25_stop_idletimer(ax25_cb *ax25)
 100 {
 101         del_timer(&ax25->idletimer);
 102 }
 103
 104 int ax25_t1timer_running(ax25_cb *ax25)
 105 {
 106         return timer_pending(&ax25->t1timer);
 107 }
 108
 109 unsigned long ax25_display_timer(struct timer_list *timer)
 110 {
 111         if (!timer_pending(timer))
 112                 return 0;
 113
 114         return timer->expires - jiffies;
 115 }
 116
 117 EXPORT_SYMBOL(ax25_display_timer);
 118
 119 static void ax25_heartbeat_expiry(struct timer_list *t)
 120 {
 121         int proto = AX25_PROTO_STD_SIMPLEX;
 122         ax25_cb *ax25 = from_timer(ax25, t, timer);
 123
 124         if (ax25->ax25_dev)
 125                 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
 126
 127         switch (proto) {
 128         case AX25_PROTO_STD_SIMPLEX:
 129         case AX25_PROTO_STD_DUPLEX:
 130                 ax25_std_heartbeat_expiry(ax25);
 131                 break;
 132
 133 #ifdef CONFIG_AX25_DAMA_SLAVE
 134         case AX25_PROTO_DAMA_SLAVE:
 135                 if (ax25->ax25_dev->dama.slave)
 136                         ax25_ds_heartbeat_expiry(ax25);
 137                 else
 138                         ax25_std_heartbeat_expiry(ax25);
 139                 break;
 140 #endif
 141         }
 142 }
 143
 144 static void ax25_t1timer_expiry(struct timer_list *t)
 145 {
 146         ax25_cb *ax25 = from_timer(ax25, t, t1timer);
 147
 148         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 149         case AX25_PROTO_STD_SIMPLEX:
 150         case AX25_PROTO_STD_DUPLEX:
 151                 ax25_std_t1timer_expiry(ax25);
 152                 break;
 153
 154 #ifdef CONFIG_AX25_DAMA_SLAVE
 155         case AX25_PROTO_DAMA_SLAVE:
 156                 if (!ax25->ax25_dev->dama.slave)
 157                         ax25_std_t1timer_expiry(ax25);
 158                 break;
 159 #endif
 160         }
 161 }
 162
 163 static void ax25_t2timer_expiry(struct timer_list *t)
 164 {
 165         ax25_cb *ax25 = from_timer(ax25, t, t2timer);
 166
 167         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 168         case AX25_PROTO_STD_SIMPLEX:
 169         case AX25_PROTO_STD_DUPLEX:
 170                 ax25_std_t2timer_expiry(ax25);
 171                 break;
 172
 173 #ifdef CONFIG_AX25_DAMA_SLAVE
 174         case AX25_PROTO_DAMA_SLAVE:
 175                 if (!ax25->ax25_dev->dama.slave)
 176                         ax25_std_t2timer_expiry(ax25);
 177                 break;
 178 #endif
 179         }
 180 }
 181
 182 static void ax25_t3timer_expiry(struct timer_list *t)
 183 {
 184         ax25_cb *ax25 = from_timer(ax25, t, t3timer);
 185
 186         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 187         case AX25_PROTO_STD_SIMPLEX:
 188         case AX25_PROTO_STD_DUPLEX:
 189                 ax25_std_t3timer_expiry(ax25);
 190                 break;
 191
 192 #ifdef CONFIG_AX25_DAMA_SLAVE
 193         case AX25_PROTO_DAMA_SLAVE:
 194                 if (ax25->ax25_dev->dama.slave)
 195                         ax25_ds_t3timer_expiry(ax25);
 196                 else
 197                         ax25_std_t3timer_expiry(ax25);
 198                 break;
 199 #endif
 200         }
 201 }
 202
 203 static void ax25_idletimer_expiry(struct timer_list *t)
 204 {
 205         ax25_cb *ax25 = from_timer(ax25, t, idletimer);
 206
 207         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 208         case AX25_PROTO_STD_SIMPLEX:
 209         case AX25_PROTO_STD_DUPLEX:
 210                 ax25_std_idletimer_expiry(ax25);
 211                 break;
 212
 213 #ifdef CONFIG_AX25_DAMA_SLAVE
 214         case AX25_PROTO_DAMA_SLAVE:
 215                 if (ax25->ax25_dev->dama.slave)
 216                         ax25_ds_idletimer_expiry(ax25);
 217                 else
 218                         ax25_std_idletimer_expiry(ax25);
 219                 break;
 220 #endif
 221         }
 222 }