1/* 2 * AX.25 release 037 3 * 4 * This code REQUIRES 2.1.15 or higher/ NET3.038 5 * 6 * This module: 7 * This module is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 * History 13 * AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams. 14 * AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from the 15 * sock structure. 16 * AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names. 17 * AX.25 031 Joerg(DL1BKE) Added DAMA support 18 * AX.25 032 Joerg(DL1BKE) Fixed DAMA timeout bug 19 * AX.25 033 Jonathan(G4KLX) Modularisation functions. 20 * AX.25 035 Frederic(F1OAT) Support for pseudo-digipeating. 21 * AX.25 036 Jonathan(G4KLX) Split Standard and DAMA code into separate files. 22 * Joerg(DL1BKE) Fixed DAMA Slave. We are *required* to start with 23 * standard AX.25 mode. 24 * AX.25 037 Jonathan(G4KLX) New timer architecture. 25 * Tomi(OH2BNS) Fixed heartbeat expiry (check ax25_dev). 26 */ 27 28#include <linux/config.h> 29#include <linux/errno.h> 30#include <linux/types.h> 31#include <linux/socket.h> 32#include <linux/in.h> 33#include <linux/kernel.h> 34#include <linux/sched.h> 35#include <linux/timer.h> 36#include <linux/string.h> 37#include <linux/sockios.h> 38#include <linux/net.h> 39#include <net/ax25.h> 40#include <linux/inet.h> 41#include <linux/netdevice.h> 42#include <linux/skbuff.h> 43#include <net/sock.h> 44#include <asm/uaccess.h> 45#include <asm/system.h> 46#include <linux/fcntl.h> 47#include <linux/mm.h> 48#include <linux/interrupt.h> 49 50static void ax25_heartbeat_expiry(unsigned long); 51static void ax25_t1timer_expiry(unsigned long); 52static void ax25_t2timer_expiry(unsigned long); 53static void ax25_t3timer_expiry(unsigned long); 54static void ax25_idletimer_expiry(unsigned long); 55 56void ax25_start_heartbeat(ax25_cb *ax25) 57{ 58 del_timer(&ax25->timer); 59 60 ax25->timer.data = (unsigned long)ax25; 61 ax25->timer.function = &ax25_heartbeat_expiry; 62 ax25->timer.expires = jiffies + 5 * HZ; 63 64 add_timer(&ax25->timer); 65} 66 67void ax25_start_t1timer(ax25_cb *ax25) 68{ 69 del_timer(&ax25->t1timer); 70 71 ax25->t1timer.data = (unsigned long)ax25; 72 ax25->t1timer.function = &ax25_t1timer_expiry; 73 ax25->t1timer.expires = jiffies + ax25->t1; 74 75 add_timer(&ax25->t1timer); 76} 77 78void ax25_start_t2timer(ax25_cb *ax25) 79{ 80 del_timer(&ax25->t2timer); 81 82 ax25->t2timer.data = (unsigned long)ax25; 83 ax25->t2timer.function = &ax25_t2timer_expiry; 84 ax25->t2timer.expires = jiffies + ax25->t2; 85 86 add_timer(&ax25->t2timer); 87} 88 89void ax25_start_t3timer(ax25_cb *ax25) 90{ 91 del_timer(&ax25->t3timer); 92 93 if (ax25->t3 > 0) { 94 ax25->t3timer.data = (unsigned long)ax25; 95 ax25->t3timer.function = &ax25_t3timer_expiry; 96 ax25->t3timer.expires = jiffies + ax25->t3; 97 98 add_timer(&ax25->t3timer); 99 } 100} 101 102void ax25_start_idletimer(ax25_cb *ax25) 103{ 104 del_timer(&ax25->idletimer); 105 106 if (ax25->idle > 0) { 107 ax25->idletimer.data = (unsigned long)ax25; 108 ax25->idletimer.function = &ax25_idletimer_expiry; 109 ax25->idletimer.expires = jiffies + ax25->idle; 110 111 add_timer(&ax25->idletimer); 112 } 113} 114 115void ax25_stop_heartbeat(ax25_cb *ax25) 116{ 117 del_timer(&ax25->timer); 118} 119 120void ax25_stop_t1timer(ax25_cb *ax25) 121{ 122 del_timer(&ax25->t1timer); 123} 124 125void ax25_stop_t2timer(ax25_cb *ax25) 126{ 127 del_timer(&ax25->t2timer); 128} 129 130void ax25_stop_t3timer(ax25_cb *ax25) 131{ 132 del_timer(&ax25->t3timer); 133} 134 135void ax25_stop_idletimer(ax25_cb *ax25) 136{ 137 del_timer(&ax25->idletimer); 138} 139 140int ax25_t1timer_running(ax25_cb *ax25) 141{ 142 return timer_pending(&ax25->t1timer); 143} 144 145unsigned long ax25_display_timer(struct timer_list *timer) 146{ 147 if (!timer_pending(timer)) 148 return 0; 149 150 return timer->expires - jiffies; 151} 152 153static void ax25_heartbeat_expiry(unsigned long param) 154{ 155 ax25_cb *ax25 = (ax25_cb *)param; 156 int proto = AX25_PROTO_STD_SIMPLEX; 157 158 if (ax25->ax25_dev) 159 proto = ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]; 160 161 switch (proto) { 162 case AX25_PROTO_STD_SIMPLEX: 163 case AX25_PROTO_STD_DUPLEX: 164 ax25_std_heartbeat_expiry(ax25); 165 break; 166 167#ifdef CONFIG_AX25_DAMA_SLAVE 168 case AX25_PROTO_DAMA_SLAVE: 169 if (ax25->ax25_dev->dama.slave) 170 ax25_ds_heartbeat_expiry(ax25); 171 else 172 ax25_std_heartbeat_expiry(ax25); 173 break; 174#endif 175 } 176} 177 178static void ax25_t1timer_expiry(unsigned long param) 179{ 180 ax25_cb *ax25 = (ax25_cb *)param; 181 182 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 183 case AX25_PROTO_STD_SIMPLEX: 184 case AX25_PROTO_STD_DUPLEX: 185 ax25_std_t1timer_expiry(ax25); 186 break; 187 188#ifdef CONFIG_AX25_DAMA_SLAVE 189 case AX25_PROTO_DAMA_SLAVE: 190 if (!ax25->ax25_dev->dama.slave) 191 ax25_std_t1timer_expiry(ax25); 192 break; 193#endif 194 } 195} 196 197static void ax25_t2timer_expiry(unsigned long param) 198{ 199 ax25_cb *ax25 = (ax25_cb *)param; 200 201 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 202 case AX25_PROTO_STD_SIMPLEX: 203 case AX25_PROTO_STD_DUPLEX: 204 ax25_std_t2timer_expiry(ax25); 205 break; 206 207#ifdef CONFIG_AX25_DAMA_SLAVE 208 case AX25_PROTO_DAMA_SLAVE: 209 if (!ax25->ax25_dev->dama.slave) 210 ax25_std_t2timer_expiry(ax25); 211 break; 212#endif 213 } 214} 215 216static void ax25_t3timer_expiry(unsigned long param) 217{ 218 ax25_cb *ax25 = (ax25_cb *)param; 219 220 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 221 case AX25_PROTO_STD_SIMPLEX: 222 case AX25_PROTO_STD_DUPLEX: 223 ax25_std_t3timer_expiry(ax25); 224 break; 225 226#ifdef CONFIG_AX25_DAMA_SLAVE 227 case AX25_PROTO_DAMA_SLAVE: 228 if (ax25->ax25_dev->dama.slave) 229 ax25_ds_t3timer_expiry(ax25); 230 else 231 ax25_std_t3timer_expiry(ax25); 232 break; 233#endif 234 } 235} 236 237static void ax25_idletimer_expiry(unsigned long param) 238{ 239 ax25_cb *ax25 = (ax25_cb *)param; 240 241 switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) { 242 case AX25_PROTO_STD_SIMPLEX: 243 case AX25_PROTO_STD_DUPLEX: 244 ax25_std_idletimer_expiry(ax25); 245 break; 246 247#ifdef CONFIG_AX25_DAMA_SLAVE 248 case AX25_PROTO_DAMA_SLAVE: 249 if (ax25->ax25_dev->dama.slave) 250 ax25_ds_idletimer_expiry(ax25); 251 else 252 ax25_std_idletimer_expiry(ax25); 253 break; 254#endif 255 } 256} 257