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/slab.h> 13 #include <linux/in.h> 14 #include <linux/kernel.h> 15 #include <linux/timer.h> 16 #include <linux/string.h> 17 #include <linux/sockios.h> 18 #include <linux/net.h> 19 #include <linux/spinlock.h> 20 #include <net/ax25.h> 21 #include <linux/inet.h> 22 #include <linux/netdevice.h> 23 #include <linux/if_arp.h> 24 #include <linux/skbuff.h> 25 #include <net/sock.h> 26 #include <asm/uaccess.h> 27 #include <asm/system.h> 28 #include <linux/fcntl.h> 29 #include <linux/mm.h> 30 #include <linux/interrupt.h> 31 #include <linux/init.h> 32 33 ax25_dev *ax25_dev_list; 34 DEFINE_SPINLOCK(ax25_dev_lock); 35 36 ax25_dev *ax25_addr_ax25dev(ax25_address *addr) 37 { 38 ax25_dev *ax25_dev, *res = NULL; 39 40 spin_lock_bh(&ax25_dev_lock); 41 for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) 42 if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) { 43 res = ax25_dev; 44 } 45 spin_unlock_bh(&ax25_dev_lock); 46 47 return res; 48 } 49 50 /* 51 * This is called when an interface is brought up. These are 52 * reasonable defaults. 53 */ 54 void ax25_dev_device_up(struct net_device *dev) 55 { 56 ax25_dev *ax25_dev; 57 58 if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) { 59 printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n"); 60 return; 61 } 62 63 ax25_unregister_sysctl(); 64 65 dev->ax25_ptr = ax25_dev; 66 ax25_dev->dev = dev; 67 dev_hold(dev); 68 ax25_dev->forward = NULL; 69 70 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; 71 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; 72 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; 73 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; 74 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; 75 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; 76 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; 77 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; 78 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; 79 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; 80 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; 81 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; 82 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; 83 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; 84 85 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 86 ax25_ds_setup_timer(ax25_dev); 87 #endif 88 89 spin_lock_bh(&ax25_dev_lock); 90 ax25_dev->next = ax25_dev_list; 91 ax25_dev_list = ax25_dev; 92 spin_unlock_bh(&ax25_dev_lock); 93 94 ax25_register_sysctl(); 95 } 96 97 void ax25_dev_device_down(struct net_device *dev) 98 { 99 ax25_dev *s, *ax25_dev; 100 101 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 102 return; 103 104 ax25_unregister_sysctl(); 105 106 spin_lock_bh(&ax25_dev_lock); 107 108 #ifdef CONFIG_AX25_DAMA_SLAVE 109 ax25_ds_del_timer(ax25_dev); 110 #endif 111 112 /* 113 * Remove any packet forwarding that points to this device. 114 */ 115 for (s = ax25_dev_list; s != NULL; s = s->next) 116 if (s->forward == dev) 117 s->forward = NULL; 118 119 if ((s = ax25_dev_list) == ax25_dev) { 120 ax25_dev_list = s->next; 121 spin_unlock_bh(&ax25_dev_lock); 122 dev_put(dev); 123 kfree(ax25_dev); 124 ax25_register_sysctl(); 125 return; 126 } 127 128 while (s != NULL && s->next != NULL) { 129 if (s->next == ax25_dev) { 130 s->next = ax25_dev->next; 131 spin_unlock_bh(&ax25_dev_lock); 132 dev_put(dev); 133 kfree(ax25_dev); 134 ax25_register_sysctl(); 135 return; 136 } 137 138 s = s->next; 139 } 140 spin_unlock_bh(&ax25_dev_lock); 141 dev->ax25_ptr = NULL; 142 143 ax25_register_sysctl(); 144 } 145 146 int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) 147 { 148 ax25_dev *ax25_dev, *fwd_dev; 149 150 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) 151 return -EINVAL; 152 153 switch (cmd) { 154 case SIOCAX25ADDFWD: 155 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) 156 return -EINVAL; 157 if (ax25_dev->forward != NULL) 158 return -EINVAL; 159 ax25_dev->forward = fwd_dev->dev; 160 break; 161 162 case SIOCAX25DELFWD: 163 if (ax25_dev->forward == NULL) 164 return -EINVAL; 165 ax25_dev->forward = NULL; 166 break; 167 168 default: 169 return -EINVAL; 170 } 171 172 return 0; 173 } 174 175 struct net_device *ax25_fwd_dev(struct net_device *dev) 176 { 177 ax25_dev *ax25_dev; 178 179 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 180 return dev; 181 182 if (ax25_dev->forward == NULL) 183 return dev; 184 185 return ax25_dev->forward; 186 } 187 188 /* 189 * Free all memory associated with device structures. 190 */ 191 void __exit ax25_dev_free(void) 192 { 193 ax25_dev *s, *ax25_dev; 194 195 spin_lock_bh(&ax25_dev_lock); 196 ax25_dev = ax25_dev_list; 197 while (ax25_dev != NULL) { 198 s = ax25_dev; 199 dev_put(ax25_dev->dev); 200 ax25_dev = ax25_dev->next; 201 kfree(s); 202 } 203 ax25_dev_list = NULL; 204 spin_unlock_bh(&ax25_dev_lock); 205 } 206