1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/slab.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/spinlock.h> #include <net/ax25.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <net/sock.h> #include <linux/uaccess.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/init.h> ax25_dev *ax25_dev_list; DEFINE_SPINLOCK(ax25_dev_lock); ax25_dev *ax25_addr_ax25dev(ax25_address *addr) { ax25_dev *ax25_dev, *res = NULL; spin_lock_bh(&ax25_dev_lock); for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next) if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) { res = ax25_dev; } spin_unlock_bh(&ax25_dev_lock); return res; } /* * This is called when an interface is brought up. These are * reasonable defaults. */ void ax25_dev_device_up(struct net_device *dev) { ax25_dev *ax25_dev; if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) { printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n"); return; } dev->ax25_ptr = ax25_dev; ax25_dev->dev = dev; dev_hold(dev); ax25_dev->forward = NULL; ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE; ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE; ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF; ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE; ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW; ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW; ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1; ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2; ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3; ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE; ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2; ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN; ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL; ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT; #if defined([31mCONFIG_AX25_DAMA_SLAVE[0m) || defined([31mCONFIG_AX25_DAMA_MASTER[0m) ax25_ds_setup_timer(ax25_dev); #endif spin_lock_bh(&ax25_dev_lock); ax25_dev->next = ax25_dev_list; ax25_dev_list = ax25_dev; spin_unlock_bh(&ax25_dev_lock); ax25_register_dev_sysctl(ax25_dev); } void ax25_dev_device_down(struct net_device *dev) { ax25_dev *s, *ax25_dev; if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) return; ax25_unregister_dev_sysctl(ax25_dev); spin_lock_bh(&ax25_dev_lock); #ifdef [31mCONFIG_AX25_DAMA_SLAVE[0m ax25_ds_del_timer(ax25_dev); #endif /* * Remove any packet forwarding that points to this device. */ for (s = ax25_dev_list; s != NULL; s = s->next) if (s->forward == dev) s->forward = NULL; if ((s = ax25_dev_list) == ax25_dev) { ax25_dev_list = s->next; spin_unlock_bh(&ax25_dev_lock); dev_put(dev); kfree(ax25_dev); return; } while (s != NULL && s->next != NULL) { if (s->next == ax25_dev) { s->next = ax25_dev->next; spin_unlock_bh(&ax25_dev_lock); dev_put(dev); kfree(ax25_dev); return; } s = s->next; } spin_unlock_bh(&ax25_dev_lock); dev->ax25_ptr = NULL; } int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd) { ax25_dev *ax25_dev, *fwd_dev; if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL) return -EINVAL; switch (cmd) { case SIOCAX25ADDFWD: if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL) return -EINVAL; if (ax25_dev->forward != NULL) return -EINVAL; ax25_dev->forward = fwd_dev->dev; break; case SIOCAX25DELFWD: if (ax25_dev->forward == NULL) return -EINVAL; ax25_dev->forward = NULL; break; default: return -EINVAL; } return 0; } struct net_device *ax25_fwd_dev(struct net_device *dev) { ax25_dev *ax25_dev; if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) return dev; if (ax25_dev->forward == NULL) return dev; return ax25_dev->forward; } /* * Free all memory associated with device structures. */ void __exit ax25_dev_free(void) { ax25_dev *s, *ax25_dev; spin_lock_bh(&ax25_dev_lock); ax25_dev = ax25_dev_list; while (ax25_dev != NULL) { s = ax25_dev; dev_put(ax25_dev->dev); ax25_dev = ax25_dev->next; kfree(s); } ax25_dev_list = NULL; spin_unlock_bh(&ax25_dev_lock); } |