net/ieee80211/ieee80211_module.c

   1 /*******************************************************************************
   2
   3   Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   4
   5   Portions of this file are based on the WEP enablement code provided by the
   6   Host AP project hostap-drivers v0.1.3
   7   Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   8   <j@w1.fi>
   9   Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi>
  10
  11   This program is free software; you can redistribute it and/or modify it
  12   under the terms of version 2 of the GNU General Public License as
  13   published by the Free Software Foundation.
  14
  15   This program is distributed in the hope that it will be useful, but WITHOUT
  16   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18   more details.
  19
  20   You should have received a copy of the GNU General Public License along with
  21   this program; if not, write to the Free Software Foundation, Inc., 59
  22   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  23
  24   The full GNU General Public License is included in this distribution in the
  25   file called LICENSE.
  26
  27   Contact Information:
  28   James P. Ketrenos <ipw2100-admin@linux.intel.com>
  29   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30
  31 *******************************************************************************/
  32
  33 #include <linux/compiler.h>
  34 #include <linux/errno.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/in6.h>
  37 #include <linux/in.h>
  38 #include <linux/ip.h>
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/netdevice.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/slab.h>
  45 #include <linux/tcp.h>
  46 #include <linux/types.h>
  47 #include <linux/wireless.h>
  48 #include <linux/etherdevice.h>
  49 #include <asm/uaccess.h>
  50 #include <net/arp.h>
  51
  52 #include <net/ieee80211.h>
  53
  54 #define DRV_DESCRIPTION "802.11 data/management/control stack"
  55 #define DRV_NAME        "ieee80211"
  56 #define DRV_VERSION     IEEE80211_VERSION
  57 #define DRV_COPYRIGHT   "Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>"
  58
  59 MODULE_VERSION(DRV_VERSION);
  60 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  61 MODULE_AUTHOR(DRV_COPYRIGHT);
  62 MODULE_LICENSE("GPL");
  63
  64 static int ieee80211_networks_allocate(struct ieee80211_device *ieee)
  65 {
  66         if (ieee->networks)
  67                 return 0;
  68
  69         ieee->networks =
  70             kzalloc(MAX_NETWORK_COUNT * sizeof(struct ieee80211_network),
  71                     GFP_KERNEL);
  72         if (!ieee->networks) {
  73                 printk(KERN_WARNING "%s: Out of memory allocating beacons\n",
  74                        ieee->dev->name);
  75                 return -ENOMEM;
  76         }
  77
  78         return 0;
  79 }
  80
  81 void ieee80211_network_reset(struct ieee80211_network *network)
  82 {
  83         if (!network)
  84                 return;
  85
  86         if (network->ibss_dfs) {
  87                 kfree(network->ibss_dfs);
  88                 network->ibss_dfs = NULL;
  89         }
  90 }
  91
  92 static inline void ieee80211_networks_free(struct ieee80211_device *ieee)
  93 {
  94         int i;
  95
  96         if (!ieee->networks)
  97                 return;
  98
  99         for (i = 0; i < MAX_NETWORK_COUNT; i++)
 100                 if (ieee->networks[i].ibss_dfs)
 101                         kfree(ieee->networks[i].ibss_dfs);
 102
 103         kfree(ieee->networks);
 104         ieee->networks = NULL;
 105 }
 106
 107 static void ieee80211_networks_initialize(struct ieee80211_device *ieee)
 108 {
 109         int i;
 110
 111         INIT_LIST_HEAD(&ieee->network_free_list);
 112         INIT_LIST_HEAD(&ieee->network_list);
 113         for (i = 0; i < MAX_NETWORK_COUNT; i++)
 114                 list_add_tail(&ieee->networks[i].list,
 115                               &ieee->network_free_list);
 116 }
 117
 118 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 119 {
 120         if ((new_mtu < 68) || (new_mtu > IEEE80211_DATA_LEN))
 121                 return -EINVAL;
 122         dev->mtu = new_mtu;
 123         return 0;
 124 }
 125
 126 static struct net_device_stats *ieee80211_generic_get_stats(
 127         struct net_device *dev)
 128 {
 129         struct ieee80211_device *ieee = netdev_priv(dev);
 130         return &ieee->stats;
 131 }
 132
 133 struct net_device *alloc_ieee80211(int sizeof_priv)
 134 {
 135         struct ieee80211_device *ieee;
 136         struct net_device *dev;
 137         int err;
 138
 139         IEEE80211_DEBUG_INFO("Initializing...\n");
 140
 141         dev = alloc_etherdev(sizeof(struct ieee80211_device) + sizeof_priv);
 142         if (!dev) {
 143                 IEEE80211_ERROR("Unable to allocate network device.\n");
 144                 goto failed;
 145         }
 146         ieee = netdev_priv(dev);
 147         dev->hard_start_xmit = ieee80211_xmit;
 148         dev->change_mtu = ieee80211_change_mtu;
 149
 150         /* Drivers are free to override this if the generic implementation
 151          * does not meet their needs. */
 152         dev->get_stats = ieee80211_generic_get_stats;
 153
 154         ieee->dev = dev;
 155
 156         err = ieee80211_networks_allocate(ieee);
 157         if (err) {
 158                 IEEE80211_ERROR("Unable to allocate beacon storage: %d\n", err);
 159                 goto failed;
 160         }
 161         ieee80211_networks_initialize(ieee);
 162
 163         /* Default fragmentation threshold is maximum payload size */
 164         ieee->fts = DEFAULT_FTS;
 165         ieee->rts = DEFAULT_FTS;
 166         ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
 167         ieee->open_wep = 1;
 168
 169         /* Default to enabling full open WEP with host based encrypt/decrypt */
 170         ieee->host_encrypt = 1;
 171         ieee->host_decrypt = 1;
 172         ieee->host_mc_decrypt = 1;
 173
 174         /* Host fragementation in Open mode. Default is enabled.
 175          * Note: host fragmentation is always enabled if host encryption
 176          * is enabled. For cards can do hardware encryption, they must do
 177          * hardware fragmentation as well. So we don't need a variable
 178          * like host_enc_frag. */
 179         ieee->host_open_frag = 1;
 180         ieee->ieee802_1x = 1;   /* Default to supporting 802.1x */
 181
 182         INIT_LIST_HEAD(&ieee->crypt_deinit_list);
 183         init_timer(&ieee->crypt_deinit_timer);
 184         ieee->crypt_deinit_timer.data = (unsigned long)ieee;
 185         ieee->crypt_deinit_timer.function = ieee80211_crypt_deinit_handler;
 186         ieee->crypt_quiesced = 0;
 187
 188         spin_lock_init(&ieee->lock);
 189
 190         ieee->wpa_enabled = 0;
 191         ieee->drop_unencrypted = 0;
 192         ieee->privacy_invoked = 0;
 193
 194         return dev;
 195
 196       failed:
 197         if (dev)
 198                 free_netdev(dev);
 199         return NULL;
 200 }
 201
 202 void free_ieee80211(struct net_device *dev)
 203 {
 204         struct ieee80211_device *ieee = netdev_priv(dev);
 205
 206         int i;
 207
 208         ieee80211_crypt_quiescing(ieee);
 209         del_timer_sync(&ieee->crypt_deinit_timer);
 210         ieee80211_crypt_deinit_entries(ieee, 1);
 211
 212         for (i = 0; i < WEP_KEYS; i++) {
 213                 struct ieee80211_crypt_data *crypt = ieee->crypt[i];
 214                 if (crypt) {
 215                         if (crypt->ops) {
 216                                 crypt->ops->deinit(crypt->priv);
 217                                 module_put(crypt->ops->owner);
 218                         }
 219                         kfree(crypt);
 220                         ieee->crypt[i] = NULL;
 221                 }
 222         }
 223
 224         ieee80211_networks_free(ieee);
 225         free_netdev(dev);
 226 }
 227
 228 #ifdef CONFIG_IEEE80211_DEBUG
 229
 230 static int debug = 0;
 231 u32 ieee80211_debug_level = 0;
 232 EXPORT_SYMBOL_GPL(ieee80211_debug_level);
 233 static struct proc_dir_entry *ieee80211_proc = NULL;
 234
 235 static int show_debug_level(char *page, char **start, off_t offset,
 236                             int count, int *eof, void *data)
 237 {
 238         return snprintf(page, count, "0x%08X\n", ieee80211_debug_level);
 239 }
 240
 241 static int store_debug_level(struct file *file, const char __user * buffer,
 242                              unsigned long count, void *data)
 243 {
 244         char buf[] = "0x00000000\n";
 245         unsigned long len = min((unsigned long)sizeof(buf) - 1, count);
 246         unsigned long val;
 247
 248         if (copy_from_user(buf, buffer, len))
 249                 return count;
 250         buf[len] = 0;
 251         if (sscanf(buf, "%li", &val) != 1)
 252                 printk(KERN_INFO DRV_NAME
 253                        ": %s is not in hex or decimal form.\n", buf);
 254         else
 255                 ieee80211_debug_level = val;
 256
 257         return strnlen(buf, len);
 258 }
 259 #endif                          /* CONFIG_IEEE80211_DEBUG */
 260
 261 static int __init ieee80211_init(void)
 262 {
 263 #ifdef CONFIG_IEEE80211_DEBUG
 264         struct proc_dir_entry *e;
 265
 266         ieee80211_debug_level = debug;
 267         ieee80211_proc = proc_mkdir(DRV_NAME, proc_net);
 268         if (ieee80211_proc == NULL) {
 269                 IEEE80211_ERROR("Unable to create " DRV_NAME
 270                                 " proc directory\n");
 271                 return -EIO;
 272         }
 273         e = create_proc_entry("debug_level", S_IFREG | S_IRUGO | S_IWUSR,
 274                               ieee80211_proc);
 275         if (!e) {
 276                 remove_proc_entry(DRV_NAME, proc_net);
 277                 ieee80211_proc = NULL;
 278                 return -EIO;
 279         }
 280         e->read_proc = show_debug_level;
 281         e->write_proc = store_debug_level;
 282         e->data = NULL;
 283 #endif                          /* CONFIG_IEEE80211_DEBUG */
 284
 285         printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
 286         printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
 287
 288         return 0;
 289 }
 290
 291 static void __exit ieee80211_exit(void)
 292 {
 293 #ifdef CONFIG_IEEE80211_DEBUG
 294         if (ieee80211_proc) {
 295                 remove_proc_entry("debug_level", ieee80211_proc);
 296                 remove_proc_entry(DRV_NAME, proc_net);
 297                 ieee80211_proc = NULL;
 298         }
 299 #endif                          /* CONFIG_IEEE80211_DEBUG */
 300 }
 301
 302 #ifdef CONFIG_IEEE80211_DEBUG
 303 #include <linux/moduleparam.h>
 304 module_param(debug, int, 0444);
 305 MODULE_PARM_DESC(debug, "debug output mask");
 306 #endif                          /* CONFIG_IEEE80211_DEBUG */
 307
 308 module_exit(ieee80211_exit);
 309 module_init(ieee80211_init);
 310
 311 const char *escape_essid(const char *essid, u8 essid_len)
 312 {
 313         static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
 314         const char *s = essid;
 315         char *d = escaped;
 316
 317         if (ieee80211_is_empty_essid(essid, essid_len)) {
 318                 memcpy(escaped, "<hidden>", sizeof("<hidden>"));
 319                 return escaped;
 320         }
 321
 322         essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
 323         while (essid_len--) {
 324                 if (*s == '\0') {
 325                         *d++ = '\\';
 326                         *d++ = '0';
 327                         s++;
 328                 } else {
 329                         *d++ = *s++;
 330                 }
 331         }
 332         *d = '\0';
 333         return escaped;
 334 }
 335
 336 EXPORT_SYMBOL(alloc_ieee80211);
 337 EXPORT_SYMBOL(free_ieee80211);
 338 EXPORT_SYMBOL(escape_essid);