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         long delta = timer->expires - jiffies;
 112
 113         if (!timer_pending(timer))
 114                 return 0;
 115
 116         return max(0L, delta);
 117 }
 118
 119 EXPORT_SYMBOL(ax25_display_timer);
 120
 121 static void ax25_heartbeat_expiry(struct timer_list *t)
 122 {
 123         int proto = AX25_PROTO_STD_SIMPLEX;
 124         ax25_cb *ax25 = from_timer(ax25, t, timer);
 125
 126         if (ax25->ax25_dev)
 127                 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL];
 128
 129         switch (proto) {
 130         case AX25_PROTO_STD_SIMPLEX:
 131         case AX25_PROTO_STD_DUPLEX:
 132                 ax25_std_heartbeat_expiry(ax25);
 133                 break;
 134
 135 #ifdef CONFIG_AX25_DAMA_SLAVE
 136         case AX25_PROTO_DAMA_SLAVE:
 137                 if (ax25->ax25_dev->dama.slave)
 138                         ax25_ds_heartbeat_expiry(ax25);
 139                 else
 140                         ax25_std_heartbeat_expiry(ax25);
 141                 break;
 142 #endif
 143         }
 144 }
 145
 146 static void ax25_t1timer_expiry(struct timer_list *t)
 147 {
 148         ax25_cb *ax25 = from_timer(ax25, t, t1timer);
 149
 150         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 151         case AX25_PROTO_STD_SIMPLEX:
 152         case AX25_PROTO_STD_DUPLEX:
 153                 ax25_std_t1timer_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_std_t1timer_expiry(ax25);
 160                 break;
 161 #endif
 162         }
 163 }
 164
 165 static void ax25_t2timer_expiry(struct timer_list *t)
 166 {
 167         ax25_cb *ax25 = from_timer(ax25, t, t2timer);
 168
 169         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 170         case AX25_PROTO_STD_SIMPLEX:
 171         case AX25_PROTO_STD_DUPLEX:
 172                 ax25_std_t2timer_expiry(ax25);
 173                 break;
 174
 175 #ifdef CONFIG_AX25_DAMA_SLAVE
 176         case AX25_PROTO_DAMA_SLAVE:
 177                 if (!ax25->ax25_dev->dama.slave)
 178                         ax25_std_t2timer_expiry(ax25);
 179                 break;
 180 #endif
 181         }
 182 }
 183
 184 static void ax25_t3timer_expiry(struct timer_list *t)
 185 {
 186         ax25_cb *ax25 = from_timer(ax25, t, t3timer);
 187
 188         switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
 189         case AX25_PROTO_STD_SIMPLEX:
 190         case AX25_PROTO_STD_DUPLEX:
 191                 ax25_std_t3timer_expiry(ax25);
 192                 break;
 193
 194 #ifdef CONFIG_AX25_DAMA_SLAVE
 195         case AX25_PROTO_DAMA_SLAVE:
 196                 if (ax25->ax25_dev->dama.slave)
 197                         ax25_ds_t3timer_expiry(ax25);
 198                 else
 199                         ax25_std_t3timer_expiry(ax25);
 200                 break;
 201 #endif
 202         }
 203 }
 204
 205 static void ax25_idletimer_expiry(struct timer_list *t)
 206 {
 207         ax25_cb *ax25 = from_timer(ax25, t, idletimer);
 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_idletimer_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_idletimer_expiry(ax25);
 219                 else
 220                         ax25_std_idletimer_expiry(ax25);
 221                 break;
 222 #endif
 223         }
 224 }