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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) 8 */ 9 #include <linux/config.h> 10 #include <linux/errno.h> 11 #include <linux/types.h> 12 #include <linux/socket.h> 13 #include <linux/in.h> 14 #include <linux/kernel.h> 15 #include <linux/sched.h> 16 #include <linux/timer.h> 17 #include <linux/string.h> 18 #include <linux/sockios.h> 19 #include <linux/net.h> 20 #include <linux/spinlock.h> 21 #include <net/ax25.h> 22 #include <linux/inet.h> 23 #include <linux/netdevice.h> 24 #include <linux/if_arp.h> 25 #include <linux/skbuff.h> 26 #include <net/sock.h> 27 #include <asm/uaccess.h> 28 #include <asm/system.h> 29 #include <linux/fcntl.h> 30 #include <linux/mm.h> 31 #include <linux/interrupt.h> 32 #include <linux/init.h> 33 34 ax25_dev *ax25_dev_list; 35 DEFINE_SPINLOCK(ax25_dev_lock); 36 37 ax25_dev *ax25_addr_ax25dev(ax25_address *addr) 38 { 39 ax25_dev *ax25_dev, *res = NULL; 40 41 spin_lock_bh(&ax25_dev_lock); 42 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) 43 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) { 44 res = ax25_dev; 45 } 46 spin_unlock_bh(&ax25_dev_lock); 47 48 return res; 49 } 50 51 /* 52 * This is called when an interface is brought up. These are 53 * reasonable defaults. 54 */ 55 void ax25_dev_device_up(struct net_device *dev) 56 { 57 ax25_dev *ax25_dev; 58 59 if ((ax25_dev = kmalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) { 60 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n"); 61 return; 62 } 63 64 ax25_unregister_sysctl(); 65 66 memset(ax25_dev, 0x00, sizeof(*ax25_dev)); 67 68 dev->ax25_ptr = ax25_dev; 69 ax25_dev->dev = dev; 70 dev_hold(dev); 71 ax25_dev->forward = NULL; 72 73 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; 74 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; 75 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; 76 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; 77 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; 78 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; 79 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; 80 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; 81 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; 82 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; 83 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; 84 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; 85 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; 86 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; 87 88 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 89 init_timer(&ax25_dev->dama.slave_timer); 90 #endif 91 92 spin_lock_bh(&ax25_dev_lock); 93 ax25_dev->next = ax25_dev_list; 94 ax25_dev_list = ax25_dev; 95 spin_unlock_bh(&ax25_dev_lock); 96 97 ax25_register_sysctl(); 98 } 99 100 void ax25_dev_device_down(struct net_device *dev) 101 { 102 ax25_dev *s, *ax25_dev; 103 104 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 105 return; 106 107 ax25_unregister_sysctl(); 108 109 spin_lock_bh(&ax25_dev_lock); 110 111 #ifdef CONFIG_AX25_DAMA_SLAVE 112 ax25_ds_del_timer(ax25_dev); 113 #endif 114 115 /* 116 * Remove any packet forwarding that points to this device. 117 */ 118 for (s = ax25_dev_list; s != NULL; s = s->next) 119 if (s->forward == dev) 120 s->forward = NULL; 121 122 if ((s = ax25_dev_list) == ax25_dev) { 123 ax25_dev_list = s->next; 124 spin_unlock_bh(&ax25_dev_lock); 125 dev_put(dev); 126 kfree(ax25_dev); 127 ax25_register_sysctl(); 128 return; 129 } 130 131 while (s != NULL && s->next != NULL) { 132 if (s->next == ax25_dev) { 133 s->next = ax25_dev->next; 134 spin_unlock_bh(&ax25_dev_lock); 135 dev_put(dev); 136 kfree(ax25_dev); 137 ax25_register_sysctl(); 138 return; 139 } 140 141 s = s->next; 142 } 143 spin_unlock_bh(&ax25_dev_lock); 144 dev->ax25_ptr = NULL; 145 146 ax25_register_sysctl(); 147 } 148 149 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) 150 { 151 ax25_dev *ax25_dev, *fwd_dev; 152 153 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) 154 return -EINVAL; 155 156 switch (cmd) { 157 case SIOCAX25ADDFWD: 158 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) 159 return -EINVAL; 160 if (ax25_dev->forward != NULL) 161 return -EINVAL; 162 ax25_dev->forward = fwd_dev->dev; 163 break; 164 165 case SIOCAX25DELFWD: 166 if (ax25_dev->forward == NULL) 167 return -EINVAL; 168 ax25_dev->forward = NULL; 169 break; 170 171 default: 172 return -EINVAL; 173 } 174 175 return 0; 176 } 177 178 struct net_device *ax25_fwd_dev(struct net_device *dev) 179 { 180 ax25_dev *ax25_dev; 181 182 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 183 return dev; 184 185 if (ax25_dev->forward == NULL) 186 return dev; 187 188 return ax25_dev->forward; 189 } 190 191 /* 192 * Free all memory associated with device structures. 193 */ 194 void __exit ax25_dev_free(void) 195 { 196 ax25_dev *s, *ax25_dev; 197 198 spin_lock_bh(&ax25_dev_lock); 199 ax25_dev = ax25_dev_list; 200 while (ax25_dev != NULL) { 201 s = ax25_dev; 202 dev_put(ax25_dev->dev); 203 ax25_dev = ax25_dev->next; 204 kfree(s); 205 } 206 ax25_dev_list = NULL; 207 spin_unlock_bh(&ax25_dev_lock); 208 } 209