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/errno.h> 10 #include <linux/types.h> 11 #include <linux/socket.h> 12 #include <linux/in.h> 13 #include <linux/kernel.h> 14 #include <linux/timer.h> 15 #include <linux/string.h> 16 #include <linux/sockios.h> 17 #include <linux/net.h> 18 #include <linux/spinlock.h> 19 #include <net/ax25.h> 20 #include <linux/inet.h> 21 #include <linux/netdevice.h> 22 #include <linux/if_arp.h> 23 #include <linux/skbuff.h> 24 #include <net/sock.h> 25 #include <asm/uaccess.h> 26 #include <asm/system.h> 27 #include <linux/fcntl.h> 28 #include <linux/mm.h> 29 #include <linux/interrupt.h> 30 #include <linux/init.h> 31 32 ax25_dev *ax25_dev_list; 33 DEFINE_SPINLOCK(ax25_dev_lock); 34 35 ax25_dev *ax25_addr_ax25dev(ax25_address *addr) 36 { 37 ax25_dev *ax25_dev, *res = NULL; 38 39 spin_lock_bh(&ax25_dev_lock); 40 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) 41 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) { 42 res = ax25_dev; 43 } 44 spin_unlock_bh(&ax25_dev_lock); 45 46 return res; 47 } 48 49 /* 50 * This is called when an interface is brought up. These are 51 * reasonable defaults. 52 */ 53 void ax25_dev_device_up(struct net_device *dev) 54 { 55 ax25_dev *ax25_dev; 56 57 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) { 58 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n"); 59 return; 60 } 61 62 ax25_unregister_sysctl(); 63 64 dev->ax25_ptr = ax25_dev; 65 ax25_dev->dev = dev; 66 dev_hold(dev); 67 ax25_dev->forward = NULL; 68 69 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; 70 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; 71 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; 72 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; 73 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; 74 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; 75 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; 76 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; 77 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; 78 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; 79 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; 80 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; 81 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; 82 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; 83 84 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 85 ax25_ds_setup_timer(ax25_dev); 86 #endif 87 88 spin_lock_bh(&ax25_dev_lock); 89 ax25_dev->next = ax25_dev_list; 90 ax25_dev_list = ax25_dev; 91 spin_unlock_bh(&ax25_dev_lock); 92 93 ax25_register_sysctl(); 94 } 95 96 void ax25_dev_device_down(struct net_device *dev) 97 { 98 ax25_dev *s, *ax25_dev; 99 100 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 101 return; 102 103 ax25_unregister_sysctl(); 104 105 spin_lock_bh(&ax25_dev_lock); 106 107 #ifdef CONFIG_AX25_DAMA_SLAVE 108 ax25_ds_del_timer(ax25_dev); 109 #endif 110 111 /* 112 * Remove any packet forwarding that points to this device. 113 */ 114 for (s = ax25_dev_list; s != NULL; s = s->next) 115 if (s->forward == dev) 116 s->forward = NULL; 117 118 if ((s = ax25_dev_list) == ax25_dev) { 119 ax25_dev_list = s->next; 120 spin_unlock_bh(&ax25_dev_lock); 121 dev_put(dev); 122 kfree(ax25_dev); 123 ax25_register_sysctl(); 124 return; 125 } 126 127 while (s != NULL && s->next != NULL) { 128 if (s->next == ax25_dev) { 129 s->next = ax25_dev->next; 130 spin_unlock_bh(&ax25_dev_lock); 131 dev_put(dev); 132 kfree(ax25_dev); 133 ax25_register_sysctl(); 134 return; 135 } 136 137 s = s->next; 138 } 139 spin_unlock_bh(&ax25_dev_lock); 140 dev->ax25_ptr = NULL; 141 142 ax25_register_sysctl(); 143 } 144 145 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) 146 { 147 ax25_dev *ax25_dev, *fwd_dev; 148 149 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) 150 return -EINVAL; 151 152 switch (cmd) { 153 case SIOCAX25ADDFWD: 154 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) 155 return -EINVAL; 156 if (ax25_dev->forward != NULL) 157 return -EINVAL; 158 ax25_dev->forward = fwd_dev->dev; 159 break; 160 161 case SIOCAX25DELFWD: 162 if (ax25_dev->forward == NULL) 163 return -EINVAL; 164 ax25_dev->forward = NULL; 165 break; 166 167 default: 168 return -EINVAL; 169 } 170 171 return 0; 172 } 173 174 struct net_device *ax25_fwd_dev(struct net_device *dev) 175 { 176 ax25_dev *ax25_dev; 177 178 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 179 return dev; 180 181 if (ax25_dev->forward == NULL) 182 return dev; 183 184 return ax25_dev->forward; 185 } 186 187 /* 188 * Free all memory associated with device structures. 189 */ 190 void __exit ax25_dev_free(void) 191 { 192 ax25_dev *s, *ax25_dev; 193 194 spin_lock_bh(&ax25_dev_lock); 195 ax25_dev = ax25_dev_list; 196 while (ax25_dev != NULL) { 197 s = ax25_dev; 198 dev_put(ax25_dev->dev); 199 ax25_dev = ax25_dev->next; 200 kfree(s); 201 } 202 ax25_dev_list = NULL; 203 spin_unlock_bh(&ax25_dev_lock); 204 } 205