drivers/net/wireless/ipw2x00/libipw_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   Intel Linux Wireless <ilw@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/net_namespace.h>
  51 #include <net/arp.h>
  52
  53 #include "libipw.h"
  54
  55 #define DRV_DESCRIPTION "802.11 data/management/control stack"
  56 #define DRV_NAME        "ieee80211"
  57 #define DRV_VERSION     LIBIPW_VERSION
  58 #define DRV_COPYRIGHT   "Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>"
  59
  60 MODULE_VERSION(DRV_VERSION);
  61 MODULE_DESCRIPTION(DRV_DESCRIPTION);
  62 MODULE_AUTHOR(DRV_COPYRIGHT);
  63 MODULE_LICENSE("GPL");
  64
  65 struct cfg80211_ops libipw_config_ops = { };
  66 void *libipw_wiphy_privid = &libipw_wiphy_privid;
  67
  68 static int libipw_networks_allocate(struct libipw_device *ieee)
  69 {
  70         if (ieee->networks)
  71                 return 0;
  72
  73         ieee->networks =
  74             kzalloc(MAX_NETWORK_COUNT * sizeof(struct libipw_network),
  75                     GFP_KERNEL);
  76         if (!ieee->networks) {
  77                 printk(KERN_WARNING "%s: Out of memory allocating beacons\n",
  78                        ieee->dev->name);
  79                 return -ENOMEM;
  80         }
  81
  82         return 0;
  83 }
  84
  85 void libipw_network_reset(struct libipw_network *network)
  86 {
  87         if (!network)
  88                 return;
  89
  90         if (network->ibss_dfs) {
  91                 kfree(network->ibss_dfs);
  92                 network->ibss_dfs = NULL;
  93         }
  94 }
  95
  96 static inline void libipw_networks_free(struct libipw_device *ieee)
  97 {
  98         int i;
  99
 100         if (!ieee->networks)
 101                 return;
 102
 103         for (i = 0; i < MAX_NETWORK_COUNT; i++)
 104                 if (ieee->networks[i].ibss_dfs)
 105                         kfree(ieee->networks[i].ibss_dfs);
 106
 107         kfree(ieee->networks);
 108         ieee->networks = NULL;
 109 }
 110
 111 void libipw_networks_age(struct libipw_device *ieee,
 112                             unsigned long age_secs)
 113 {
 114         struct libipw_network *network = NULL;
 115         unsigned long flags;
 116         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
 117
 118         spin_lock_irqsave(&ieee->lock, flags);
 119         list_for_each_entry(network, &ieee->network_list, list) {
 120                 network->last_scanned -= age_jiffies;
 121         }
 122         spin_unlock_irqrestore(&ieee->lock, flags);
 123 }
 124 EXPORT_SYMBOL(libipw_networks_age);
 125
 126 static void libipw_networks_initialize(struct libipw_device *ieee)
 127 {
 128         int i;
 129
 130         INIT_LIST_HEAD(&ieee->network_free_list);
 131         INIT_LIST_HEAD(&ieee->network_list);
 132         for (i = 0; i < MAX_NETWORK_COUNT; i++)
 133                 list_add_tail(&ieee->networks[i].list,
 134                               &ieee->network_free_list);
 135 }
 136
 137 int libipw_change_mtu(struct net_device *dev, int new_mtu)
 138 {
 139         if ((new_mtu < 68) || (new_mtu > LIBIPW_DATA_LEN))
 140                 return -EINVAL;
 141         dev->mtu = new_mtu;
 142         return 0;
 143 }
 144 EXPORT_SYMBOL(libipw_change_mtu);
 145
 146 struct net_device *alloc_ieee80211(int sizeof_priv, int monitor)
 147 {
 148         struct libipw_device *ieee;
 149         struct net_device *dev;
 150         int err;
 151
 152         LIBIPW_DEBUG_INFO("Initializing...\n");
 153
 154         dev = alloc_etherdev(sizeof(struct libipw_device) + sizeof_priv);
 155         if (!dev) {
 156                 LIBIPW_ERROR("Unable to allocate network device.\n");
 157                 goto failed;
 158         }
 159         ieee = netdev_priv(dev);
 160
 161         ieee->dev = dev;
 162
 163         if (!monitor) {
 164                 ieee->wdev.wiphy = wiphy_new(&libipw_config_ops, 0);
 165                 if (!ieee->wdev.wiphy) {
 166                         LIBIPW_ERROR("Unable to allocate wiphy.\n");
 167                         goto failed_free_netdev;
 168                 }
 169
 170                 ieee->dev->ieee80211_ptr = &ieee->wdev;
 171                 ieee->wdev.iftype = NL80211_IFTYPE_STATION;
 172
 173                 /* Fill-out wiphy structure bits we know...  Not enough info
 174                    here to call set_wiphy_dev or set MAC address or channel info
 175                    -- have to do that in ->ndo_init... */
 176                 ieee->wdev.wiphy->privid = libipw_wiphy_privid;
 177
 178                 ieee->wdev.wiphy->max_scan_ssids = 1;
 179                 ieee->wdev.wiphy->max_scan_ie_len = 0;
 180                 ieee->wdev.wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION)
 181                                                 | BIT(NL80211_IFTYPE_ADHOC);
 182         }
 183
 184         err = libipw_networks_allocate(ieee);
 185         if (err) {
 186                 LIBIPW_ERROR("Unable to allocate beacon storage: %d\n", err);
 187                 goto failed_free_wiphy;
 188         }
 189         libipw_networks_initialize(ieee);
 190
 191         /* Default fragmentation threshold is maximum payload size */
 192         ieee->fts = DEFAULT_FTS;
 193         ieee->rts = DEFAULT_FTS;
 194         ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
 195         ieee->open_wep = 1;
 196
 197         /* Default to enabling full open WEP with host based encrypt/decrypt */
 198         ieee->host_encrypt = 1;
 199         ieee->host_decrypt = 1;
 200         ieee->host_mc_decrypt = 1;
 201
 202         /* Host fragementation in Open mode. Default is enabled.
 203          * Note: host fragmentation is always enabled if host encryption
 204          * is enabled. For cards can do hardware encryption, they must do
 205          * hardware fragmentation as well. So we don't need a variable
 206          * like host_enc_frag. */
 207         ieee->host_open_frag = 1;
 208         ieee->ieee802_1x = 1;   /* Default to supporting 802.1x */
 209
 210         spin_lock_init(&ieee->lock);
 211
 212         lib80211_crypt_info_init(&ieee->crypt_info, dev->name, &ieee->lock);
 213
 214         ieee->wpa_enabled = 0;
 215         ieee->drop_unencrypted = 0;
 216         ieee->privacy_invoked = 0;
 217
 218         return dev;
 219
 220 failed_free_wiphy:
 221         if (!monitor)
 222                 wiphy_free(ieee->wdev.wiphy);
 223 failed_free_netdev:
 224         free_netdev(dev);
 225 failed:
 226         return NULL;
 227 }
 228
 229 void free_ieee80211(struct net_device *dev, int monitor)
 230 {
 231         struct libipw_device *ieee = netdev_priv(dev);
 232
 233         lib80211_crypt_info_free(&ieee->crypt_info);
 234
 235         libipw_networks_free(ieee);
 236
 237         /* free cfg80211 resources */
 238         if (!monitor) {
 239                 wiphy_unregister(ieee->wdev.wiphy);
 240                 kfree(ieee->a_band.channels);
 241                 kfree(ieee->bg_band.channels);
 242                 wiphy_free(ieee->wdev.wiphy);
 243         }
 244
 245         free_netdev(dev);
 246 }
 247
 248 #ifdef CONFIG_LIBIPW_DEBUG
 249
 250 static int debug = 0;
 251 u32 libipw_debug_level = 0;
 252 EXPORT_SYMBOL_GPL(libipw_debug_level);
 253 static struct proc_dir_entry *libipw_proc = NULL;
 254
 255 static int show_debug_level(char *page, char **start, off_t offset,
 256                             int count, int *eof, void *data)
 257 {
 258         return snprintf(page, count, "0x%08X\n", libipw_debug_level);
 259 }
 260
 261 static int store_debug_level(struct file *file, const char __user * buffer,
 262                              unsigned long count, void *data)
 263 {
 264         char buf[] = "0x00000000\n";
 265         unsigned long len = min((unsigned long)sizeof(buf) - 1, count);
 266         unsigned long val;
 267
 268         if (copy_from_user(buf, buffer, len))
 269                 return count;
 270         buf[len] = 0;
 271         if (sscanf(buf, "%li", &val) != 1)
 272                 printk(KERN_INFO DRV_NAME
 273                        ": %s is not in hex or decimal form.\n", buf);
 274         else
 275                 libipw_debug_level = val;
 276
 277         return strnlen(buf, len);
 278 }
 279 #endif                          /* CONFIG_LIBIPW_DEBUG */
 280
 281 static int __init libipw_init(void)
 282 {
 283 #ifdef CONFIG_LIBIPW_DEBUG
 284         struct proc_dir_entry *e;
 285
 286         libipw_debug_level = debug;
 287         libipw_proc = proc_mkdir(DRV_NAME, init_net.proc_net);
 288         if (libipw_proc == NULL) {
 289                 LIBIPW_ERROR("Unable to create " DRV_NAME
 290                                 " proc directory\n");
 291                 return -EIO;
 292         }
 293         e = create_proc_entry("debug_level", S_IFREG | S_IRUGO | S_IWUSR,
 294                               libipw_proc);
 295         if (!e) {
 296                 remove_proc_entry(DRV_NAME, init_net.proc_net);
 297                 libipw_proc = NULL;
 298                 return -EIO;
 299         }
 300         e->read_proc = show_debug_level;
 301         e->write_proc = store_debug_level;
 302         e->data = NULL;
 303 #endif                          /* CONFIG_LIBIPW_DEBUG */
 304
 305         printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION ", " DRV_VERSION "\n");
 306         printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
 307
 308         return 0;
 309 }
 310
 311 static void __exit libipw_exit(void)
 312 {
 313 #ifdef CONFIG_LIBIPW_DEBUG
 314         if (libipw_proc) {
 315                 remove_proc_entry("debug_level", libipw_proc);
 316                 remove_proc_entry(DRV_NAME, init_net.proc_net);
 317                 libipw_proc = NULL;
 318         }
 319 #endif                          /* CONFIG_LIBIPW_DEBUG */
 320 }
 321
 322 #ifdef CONFIG_LIBIPW_DEBUG
 323 #include <linux/moduleparam.h>
 324 module_param(debug, int, 0444);
 325 MODULE_PARM_DESC(debug, "debug output mask");
 326 #endif                          /* CONFIG_LIBIPW_DEBUG */
 327
 328 module_exit(libipw_exit);
 329 module_init(libipw_init);
 330
 331 EXPORT_SYMBOL(alloc_ieee80211);
 332 EXPORT_SYMBOL(free_ieee80211);