net/ieee80211/softmac/ieee80211softmac_module.c

   1 /*
   2  * Contains some basic softmac functions along with module registration code etc.
   3  *
   4  * Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
   5  *                          Joseph Jezak <josejx@gentoo.org>
   6  *                          Larry Finger <Larry.Finger@lwfinger.net>
   7  *                          Danny van Dyk <kugelfang@gentoo.org>
   8  *                          Michael Buesch <mbuesch@freenet.de>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  22  *
  23  * The full GNU General Public License is included in this distribution in the
  24  * file called COPYING.
  25  */
  26
  27 #include "ieee80211softmac_priv.h"
  28 #include <linux/sort.h>
  29
  30 struct net_device *alloc_ieee80211softmac(int sizeof_priv)
  31 {
  32         struct ieee80211softmac_device *softmac;
  33         struct net_device *dev;
  34
  35         dev = alloc_ieee80211(sizeof(struct ieee80211softmac_device) + sizeof_priv);
  36         softmac = ieee80211_priv(dev);
  37         softmac->dev = dev;
  38         softmac->ieee = netdev_priv(dev);
  39         spin_lock_init(&softmac->lock);
  40
  41         softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
  42         softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
  43         softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
  44         softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
  45         softmac->scaninfo = NULL;
  46
  47         /* TODO: initialise all the other callbacks in the ieee struct
  48          *       (once they're written)
  49          */
  50
  51         INIT_LIST_HEAD(&softmac->auth_queue);
  52         INIT_LIST_HEAD(&softmac->network_list);
  53         INIT_LIST_HEAD(&softmac->events);
  54
  55         INIT_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work, softmac);
  56         INIT_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout, softmac);
  57         softmac->start_scan = ieee80211softmac_start_scan_implementation;
  58         softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
  59         softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
  60
  61         //TODO: The mcast rate has to be assigned dynamically somewhere (in scanning, association. Not sure...)
  62         //      It has to be set to the highest rate all stations in the current network can handle.
  63         softmac->txrates.mcast_rate = IEEE80211_CCK_RATE_1MB;
  64         softmac->txrates.mcast_fallback = IEEE80211_CCK_RATE_1MB;
  65         /* This is reassigned in ieee80211softmac_start to sane values. */
  66         softmac->txrates.default_rate = IEEE80211_CCK_RATE_1MB;
  67         softmac->txrates.default_fallback = IEEE80211_CCK_RATE_1MB;
  68
  69         /* to start with, we can't send anything ... */
  70         netif_carrier_off(dev);
  71
  72         return dev;
  73 }
  74 EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
  75
  76 /* Clears the pending work queue items, stops all scans, etc. */
  77 void
  78 ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
  79 {
  80         unsigned long flags;
  81         struct ieee80211softmac_event *eventptr, *eventtmp;
  82         struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
  83         struct ieee80211softmac_network *netptr, *nettmp;
  84
  85         ieee80211softmac_stop_scan(sm);
  86         ieee80211softmac_wait_for_scan(sm);
  87
  88         spin_lock_irqsave(&sm->lock, flags);
  89         /* Free all pending assoc work items */
  90         cancel_delayed_work(&sm->associnfo.work);
  91
  92         /* Free all pending scan work items */
  93         if(sm->scaninfo != NULL)
  94                 cancel_delayed_work(&sm->scaninfo->softmac_scan);
  95
  96         /* Free all pending auth work items */
  97         list_for_each_entry(authptr, &sm->auth_queue, list)
  98                 cancel_delayed_work(&authptr->work);
  99
 100         /* delete all pending event calls and work items */
 101         list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
 102                 cancel_delayed_work(&eventptr->work);
 103
 104         spin_unlock_irqrestore(&sm->lock, flags);
 105         flush_scheduled_work();
 106
 107         /* now we should be save and no longer need locking... */
 108         spin_lock_irqsave(&sm->lock, flags);
 109         /* Free all pending auth work items */
 110         list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
 111                 list_del(&authptr->list);
 112                 kfree(authptr);
 113         }
 114
 115         /* delete all pending event calls and work items */
 116         list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
 117                 list_del(&eventptr->list);
 118                 kfree(eventptr);
 119         }
 120
 121         /* Free all networks */
 122         list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
 123                 ieee80211softmac_del_network_locked(sm, netptr);
 124                 if(netptr->challenge != NULL)
 125                         kfree(netptr->challenge);
 126                 kfree(netptr);
 127         }
 128
 129         spin_unlock_irqrestore(&sm->lock, flags);
 130 }
 131 EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);
 132
 133 void free_ieee80211softmac(struct net_device *dev)
 134 {
 135         struct ieee80211softmac_device *sm = ieee80211_priv(dev);
 136         ieee80211softmac_clear_pending_work(sm);
 137         kfree(sm->scaninfo);
 138         kfree(sm->wpa.IE);
 139         free_ieee80211(dev);
 140 }
 141 EXPORT_SYMBOL_GPL(free_ieee80211softmac);
 142
 143 static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
 144 {
 145         struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
 146         /* I took out the sorting check, we're seperating by modulation now. */
 147         if (ri->count)
 148                 return;
 149         /* otherwise assume we hav'em all! */
 150         if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
 151                 ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
 152                 ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
 153                 ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
 154                 ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
 155         }
 156         if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
 157                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
 158                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
 159                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
 160                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
 161                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
 162                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
 163                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
 164                 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
 165         }
 166 }
 167
 168 void ieee80211softmac_start(struct net_device *dev)
 169 {
 170         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
 171         struct ieee80211_device *ieee = mac->ieee;
 172         u32 change = 0;
 173         struct ieee80211softmac_txrates oldrates;
 174
 175         ieee80211softmac_start_check_rates(mac);
 176
 177         /* TODO: We need some kind of state machine to lower the default rates
 178          *       if we loose too many packets.
 179          */
 180         /* Change the default txrate to the highest possible value.
 181          * The txrate machine will lower it, if it is too high.
 182          */
 183         if (mac->txrates_change)
 184                 oldrates = mac->txrates;
 185         if (ieee->modulation & IEEE80211_OFDM_MODULATION) {
 186                 mac->txrates.default_rate = IEEE80211_OFDM_RATE_54MB;
 187                 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
 188                 mac->txrates.default_fallback = IEEE80211_OFDM_RATE_24MB;
 189                 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
 190         } else if (ieee->modulation & IEEE80211_CCK_MODULATION) {
 191                 mac->txrates.default_rate = IEEE80211_CCK_RATE_11MB;
 192                 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
 193                 mac->txrates.default_fallback = IEEE80211_CCK_RATE_5MB;
 194                 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
 195         } else
 196                 assert(0);
 197         if (mac->txrates_change)
 198                 mac->txrates_change(dev, change, &oldrates);
 199 }
 200 EXPORT_SYMBOL_GPL(ieee80211softmac_start);
 201
 202 void ieee80211softmac_stop(struct net_device *dev)
 203 {
 204         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
 205
 206         ieee80211softmac_clear_pending_work(mac);
 207 }
 208 EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
 209
 210 void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
 211 {
 212         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
 213         unsigned long flags;
 214
 215         spin_lock_irqsave(&mac->lock, flags);
 216         memcpy(mac->ratesinfo.rates, rates, count);
 217         mac->ratesinfo.count = count;
 218         spin_unlock_irqrestore(&mac->lock, flags);
 219 }
 220 EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
 221
 222 static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
 223 {
 224         int i;
 225         struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
 226
 227         for (i=0; i<ri->count-1; i++) {
 228                 if (ri->rates[i] == rate)
 229                         return ri->rates[i+1];
 230         }
 231         /* I guess we can't go any higher... */
 232         return ri->rates[ri->count];
 233 }
 234
 235 u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
 236 {
 237         int i;
 238         struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
 239
 240         for (i=delta; i<ri->count; i++) {
 241                 if (ri->rates[i] == rate)
 242                         return ri->rates[i-delta];
 243         }
 244         /* I guess we can't go any lower... */
 245         return ri->rates[0];
 246 }
 247
 248 static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
 249                                                  int amount)
 250 {
 251         struct ieee80211softmac_txrates oldrates;
 252         u8 default_rate = mac->txrates.default_rate;
 253         u8 default_fallback = mac->txrates.default_fallback;
 254         u32 changes = 0;
 255
 256         //TODO: This is highly experimental code.
 257         //      Maybe the dynamic rate selection does not work
 258         //      and it has to be removed again.
 259
 260 printk("badness %d\n", mac->txrate_badness);
 261         mac->txrate_badness += amount;
 262         if (mac->txrate_badness <= -1000) {
 263                 /* Very small badness. Try a faster bitrate. */
 264                 if (mac->txrates_change)
 265                         memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
 266                 default_rate = raise_rate(mac, default_rate);
 267                 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
 268                 default_fallback = get_fallback_rate(mac, default_rate);
 269                 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
 270                 mac->txrate_badness = 0;
 271 printk("Bitrate raised to %u\n", default_rate);
 272         } else if (mac->txrate_badness >= 10000) {
 273                 /* Very high badness. Try a slower bitrate. */
 274                 if (mac->txrates_change)
 275                         memcpy(&oldrates, &mac->txrates, sizeof(oldrates));
 276                 default_rate = lower_rate(mac, default_rate);
 277                 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
 278                 default_fallback = get_fallback_rate(mac, default_rate);
 279                 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
 280                 mac->txrate_badness = 0;
 281 printk("Bitrate lowered to %u\n", default_rate);
 282         }
 283
 284         mac->txrates.default_rate = default_rate;
 285         mac->txrates.default_fallback = default_fallback;
 286
 287         if (changes && mac->txrates_change)
 288                 mac->txrates_change(mac->dev, changes, &oldrates);
 289 }
 290
 291 void ieee80211softmac_fragment_lost(struct net_device *dev,
 292                                     u16 wl_seq)
 293 {
 294         struct ieee80211softmac_device *mac = ieee80211_priv(dev);
 295         unsigned long flags;
 296
 297         spin_lock_irqsave(&mac->lock, flags);
 298         ieee80211softmac_add_txrates_badness(mac, 1000);
 299         //TODO
 300
 301         spin_unlock_irqrestore(&mac->lock, flags);
 302 }
 303 EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
 304
 305 static int rate_cmp(const void *a_, const void *b_) {
 306         u8 *a, *b;
 307         a = (u8*)a_;
 308         b = (u8*)b_;
 309         return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
 310 }
 311
 312 /* Allocate a softmac network struct and fill it from a network */
 313 struct ieee80211softmac_network *
 314 ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
 315         struct ieee80211_network *net)
 316 {
 317         struct ieee80211softmac_network *softnet;
 318         softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
 319         if(softnet == NULL)
 320                 return NULL;
 321         memcpy(softnet->bssid, net->bssid, ETH_ALEN);
 322         softnet->channel = net->channel;
 323         softnet->essid.len = net->ssid_len;
 324         memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
 325
 326         /* copy rates over */
 327         softnet->supported_rates.count = net->rates_len;
 328         memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
 329         memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
 330         softnet->supported_rates.count += net->rates_ex_len;
 331         sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
 332
 333         softnet->capabilities = net->capability;
 334         return softnet;
 335 }
 336
 337
 338 /* Add a network to the list, while locked */
 339 void
 340 ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
 341         struct ieee80211softmac_network *add_net)
 342 {
 343         struct list_head *list_ptr;
 344         struct ieee80211softmac_network *softmac_net = NULL;
 345
 346         list_for_each(list_ptr, &mac->network_list) {
 347                 softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
 348                 if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
 349                         break;
 350                 else
 351                         softmac_net = NULL;
 352         }
 353         if(softmac_net == NULL)
 354                 list_add(&(add_net->list), &mac->network_list);
 355 }
 356
 357 /* Add a network to the list, with locking */
 358 void
 359 ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
 360         struct ieee80211softmac_network *add_net)
 361 {
 362         unsigned long flags;
 363         spin_lock_irqsave(&mac->lock, flags);
 364         ieee80211softmac_add_network_locked(mac, add_net);
 365         spin_unlock_irqrestore(&mac->lock, flags);
 366 }
 367
 368
 369 /* Delete a network from the list, while locked*/
 370 void
 371 ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
 372         struct ieee80211softmac_network *del_net)
 373 {
 374         list_del(&(del_net->list));
 375 }
 376
 377 /* Delete a network from the list with locking */
 378 void
 379 ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
 380         struct ieee80211softmac_network *del_net)
 381 {
 382         unsigned long flags;
 383         spin_lock_irqsave(&mac->lock, flags);
 384         ieee80211softmac_del_network_locked(mac, del_net);
 385         spin_unlock_irqrestore(&mac->lock, flags);
 386 }
 387
 388 /* Get a network from the list by MAC while locked */
 389 struct ieee80211softmac_network *
 390 ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac,
 391         u8 *bssid)
 392 {
 393         struct list_head *list_ptr;
 394         struct ieee80211softmac_network *softmac_net = NULL;
 395         list_for_each(list_ptr, &mac->network_list) {
 396                 softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
 397                 if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
 398                         break;
 399                 else
 400                         softmac_net = NULL;
 401         }
 402         return softmac_net;
 403 }
 404
 405 /* Get a network from the list by BSSID with locking */
 406 struct ieee80211softmac_network *
 407 ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac,
 408         u8 *bssid)
 409 {
 410         unsigned long flags;
 411         struct ieee80211softmac_network *softmac_net;
 412
 413         spin_lock_irqsave(&mac->lock, flags);
 414         softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid);
 415         spin_unlock_irqrestore(&mac->lock, flags);
 416         return softmac_net;
 417 }
 418
 419 /* Get a network from the list by ESSID while locked */
 420 struct ieee80211softmac_network *
 421 ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac,
 422         struct ieee80211softmac_essid *essid)
 423 {
 424         struct list_head *list_ptr;
 425         struct ieee80211softmac_network *softmac_net = NULL;
 426
 427         list_for_each(list_ptr, &mac->network_list) {
 428                 softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
 429                 if (softmac_net->essid.len == essid->len &&
 430                         !memcmp(softmac_net->essid.data, essid->data, essid->len))
 431                         return softmac_net;
 432         }
 433         return NULL;
 434 }
 435
 436 /* Get a network from the list by ESSID with locking */
 437 struct ieee80211softmac_network *
 438 ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac,
 439         struct ieee80211softmac_essid *essid)
 440 {
 441         unsigned long flags;
 442         struct ieee80211softmac_network *softmac_net = NULL;
 443
 444         spin_lock_irqsave(&mac->lock, flags);
 445         softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid);
 446         spin_unlock_irqrestore(&mac->lock, flags);
 447         return softmac_net;
 448 }
 449
 450 MODULE_LICENSE("GPL");
 451 MODULE_AUTHOR("Johannes Berg");
 452 MODULE_AUTHOR("Joseph Jezak");
 453 MODULE_AUTHOR("Larry Finger");
 454 MODULE_AUTHOR("Danny van Dyk");
 455 MODULE_AUTHOR("Michael Buesch");
 456 MODULE_DESCRIPTION("802.11 software MAC");