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 <linux/uaccess.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 ax25_addr_ax25dev(ax25_address * addr)35ax25_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 */ ax25_dev_device_up(struct net_device * dev)53void 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 dev->ax25_ptr = ax25_dev; 63 ax25_dev->dev = dev; 64 dev_hold(dev); 65 ax25_dev->forward = NULL; 66 67 ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; 68 ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; 69 ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; 70 ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; 71 ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; 72 ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; 73 ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; 74 ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; 75 ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; 76 ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; 77 ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; 78 ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; 79 ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; 80 ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; 81 82 #if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER) 83 ax25_ds_setup_timer(ax25_dev); 84 #endif 85 86 spin_lock_bh(&ax25_dev_lock); 87 ax25_dev->next = ax25_dev_list; 88 ax25_dev_list = ax25_dev; 89 spin_unlock_bh(&ax25_dev_lock); 90 91 ax25_register_dev_sysctl(ax25_dev); 92 } 93 ax25_dev_device_down(struct net_device * dev)94void ax25_dev_device_down(struct net_device *dev) 95 { 96 ax25_dev *s, *ax25_dev; 97 98 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 99 return; 100 101 ax25_unregister_dev_sysctl(ax25_dev); 102 103 spin_lock_bh(&ax25_dev_lock); 104 105 #ifdef CONFIG_AX25_DAMA_SLAVE 106 ax25_ds_del_timer(ax25_dev); 107 #endif 108 109 /* 110 * Remove any packet forwarding that points to this device. 111 */ 112 for (s = ax25_dev_list; s != NULL; s = s->next) 113 if (s->forward == dev) 114 s->forward = NULL; 115 116 if ((s = ax25_dev_list) == ax25_dev) { 117 ax25_dev_list = s->next; 118 spin_unlock_bh(&ax25_dev_lock); 119 dev_put(dev); 120 kfree(ax25_dev); 121 return; 122 } 123 124 while (s != NULL && s->next != NULL) { 125 if (s->next == ax25_dev) { 126 s->next = ax25_dev->next; 127 spin_unlock_bh(&ax25_dev_lock); 128 dev_put(dev); 129 kfree(ax25_dev); 130 return; 131 } 132 133 s = s->next; 134 } 135 spin_unlock_bh(&ax25_dev_lock); 136 dev->ax25_ptr = NULL; 137 } 138 ax25_fwd_ioctl(unsigned int cmd,struct ax25_fwd_struct * fwd)139int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) 140 { 141 ax25_dev *ax25_dev, *fwd_dev; 142 143 if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) 144 return -EINVAL; 145 146 switch (cmd) { 147 case SIOCAX25ADDFWD: 148 if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) 149 return -EINVAL; 150 if (ax25_dev->forward != NULL) 151 return -EINVAL; 152 ax25_dev->forward = fwd_dev->dev; 153 break; 154 155 case SIOCAX25DELFWD: 156 if (ax25_dev->forward == NULL) 157 return -EINVAL; 158 ax25_dev->forward = NULL; 159 break; 160 161 default: 162 return -EINVAL; 163 } 164 165 return 0; 166 } 167 ax25_fwd_dev(struct net_device * dev)168struct net_device *ax25_fwd_dev(struct net_device *dev) 169 { 170 ax25_dev *ax25_dev; 171 172 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) 173 return dev; 174 175 if (ax25_dev->forward == NULL) 176 return dev; 177 178 return ax25_dev->forward; 179 } 180 181 /* 182 * Free all memory associated with device structures. 183 */ ax25_dev_free(void)184void __exit ax25_dev_free(void) 185 { 186 ax25_dev *s, *ax25_dev; 187 188 spin_lock_bh(&ax25_dev_lock); 189 ax25_dev = ax25_dev_list; 190 while (ax25_dev != NULL) { 191 s = ax25_dev; 192 dev_put(ax25_dev->dev); 193 ax25_dev = ax25_dev->next; 194 kfree(s); 195 } 196 ax25_dev_list = NULL; 197 spin_unlock_bh(&ax25_dev_lock); 198 } 199
