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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / net / ieee80211 / softmac / ieee80211softmac_module.c
blob07505ca859af7f7c91f69c54b39a731a24d75cbd
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 #include <linux/etherdevice.h>
30
31 struct net_device *alloc_ieee80211softmac(int sizeof_priv)
32 {
33 struct ieee80211softmac_device *softmac;
34 struct net_device *dev;
35
36 dev = alloc_ieee80211(sizeof(*softmac) + sizeof_priv);
37 if (!dev)
38 return NULL;
39 softmac = ieee80211_priv(dev);
40 softmac->wq = create_freezeable_workqueue("softmac");
41 if (!softmac->wq) {
42 free_ieee80211(dev);
43 return NULL;
44 }
45
46 softmac->dev = dev;
47 softmac->ieee = netdev_priv(dev);
48 spin_lock_init(&softmac->lock);
49
50 softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
51 softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
52 softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
53 softmac->ieee->handle_reassoc_request = ieee80211softmac_handle_reassoc_req;
54 softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
55 softmac->ieee->handle_beacon = ieee80211softmac_handle_beacon;
56 softmac->scaninfo = NULL;
57
58 softmac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
59
60 /* TODO: initialise all the other callbacks in the ieee struct
61 * (once they're written)
62 */
63
64 INIT_LIST_HEAD(&softmac->auth_queue);
65 INIT_LIST_HEAD(&softmac->network_list);
66 INIT_LIST_HEAD(&softmac->events);
67
68 mutex_init(&softmac->associnfo.mutex);
69 INIT_DELAYED_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work);
70 INIT_DELAYED_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout);
71 softmac->start_scan = ieee80211softmac_start_scan_implementation;
72 softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
73 softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
74
75 /* to start with, we can't send anything ... */
76 netif_carrier_off(dev);
77
78 return dev;
79 }
80 EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
81
82 /* Clears the pending work queue items, stops all scans, etc. */
83 void
84 ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
85 {
86 unsigned long flags;
87 struct ieee80211softmac_event *eventptr, *eventtmp;
88 struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
89 struct ieee80211softmac_network *netptr, *nettmp;
90
91 ieee80211softmac_stop_scan(sm);
92 ieee80211softmac_wait_for_scan(sm);
93
94 spin_lock_irqsave(&sm->lock, flags);
95 sm->running = 0;
96
97 /* Free all pending assoc work items */
98 cancel_delayed_work(&sm->associnfo.work);
99
100 /* Free all pending scan work items */
101 if(sm->scaninfo != NULL)
102 cancel_delayed_work(&sm->scaninfo->softmac_scan);
103
104 /* Free all pending auth work items */
105 list_for_each_entry(authptr, &sm->auth_queue, list)
106 cancel_delayed_work(&authptr->work);
107
108 /* delete all pending event calls and work items */
109 list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
110 cancel_delayed_work(&eventptr->work);
111
112 spin_unlock_irqrestore(&sm->lock, flags);
113 flush_workqueue(sm->wq);
114
115 /* now we should be save and no longer need locking... */
116 spin_lock_irqsave(&sm->lock, flags);
117 /* Free all pending auth work items */
118 list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
119 list_del(&authptr->list);
120 kfree(authptr);
121 }
122
123 /* delete all pending event calls and work items */
124 list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
125 list_del(&eventptr->list);
126 kfree(eventptr);
127 }
128
129 /* Free all networks */
130 list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
131 ieee80211softmac_del_network_locked(sm, netptr);
132 if(netptr->challenge != NULL)
133 kfree(netptr->challenge);
134 kfree(netptr);
135 }
136
137 spin_unlock_irqrestore(&sm->lock, flags);
138 }
139 EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);
140
141 void free_ieee80211softmac(struct net_device *dev)
142 {
143 struct ieee80211softmac_device *sm = ieee80211_priv(dev);
144 ieee80211softmac_clear_pending_work(sm);
145 kfree(sm->scaninfo);
146 kfree(sm->wpa.IE);
147 destroy_workqueue(sm->wq);
148 free_ieee80211(dev);
149 }
150 EXPORT_SYMBOL_GPL(free_ieee80211softmac);
151
152 static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
153 {
154 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
155 /* I took out the sorting check, we're seperating by modulation now. */
156 if (ri->count)
157 return;
158 /* otherwise assume we hav'em all! */
159 if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
160 ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
161 ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
162 ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
163 ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
164 }
165 if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
166 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
167 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
168 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
169 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
170 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
171 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
172 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
173 ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
174 }
175 }
176
177 int ieee80211softmac_ratesinfo_rate_supported(struct ieee80211softmac_ratesinfo *ri, u8 rate)
178 {
179 int search;
180 u8 search_rate;
181
182 for (search = 0; search < ri->count; search++) {
183 search_rate = ri->rates[search];
184 search_rate &= ~IEEE80211_BASIC_RATE_MASK;
185 if (rate == search_rate)
186 return 1;
187 }
188
189 return 0;
190 }
191
192 u8 ieee80211softmac_highest_supported_rate(struct ieee80211softmac_device *mac,
193 struct ieee80211softmac_ratesinfo *ri, int basic_only)
194 {
195 u8 user_rate = mac->txrates.user_rate;
196 int i;
197
198 if (ri->count == 0)
199 return IEEE80211_CCK_RATE_1MB;
200
201 for (i = ri->count - 1; i >= 0; i--) {
202 u8 rate = ri->rates[i];
203 if (basic_only && !(rate & IEEE80211_BASIC_RATE_MASK))
204 continue;
205 rate &= ~IEEE80211_BASIC_RATE_MASK;
206 if (rate > user_rate)
207 continue;
208 if (ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
209 return rate;
210 }
211
212 /* If we haven't found a suitable rate by now, just trust the user */
213 return user_rate;
214 }
215 EXPORT_SYMBOL_GPL(ieee80211softmac_highest_supported_rate);
216
217 void ieee80211softmac_process_erp(struct ieee80211softmac_device *mac,
218 u8 erp_value)
219 {
220 int use_protection;
221 int short_preamble;
222 u32 changes = 0;
223
224 /* Barker preamble mode */
225 short_preamble = ((erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0
226 && mac->associnfo.short_preamble_available) ? 1 : 0;
227
228 /* Protection needed? */
229 use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
230
231 if (mac->bssinfo.short_preamble != short_preamble) {
232 changes |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
233 mac->bssinfo.short_preamble = short_preamble;
234 }
235
236 if (mac->bssinfo.use_protection != use_protection) {
237 changes |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
238 mac->bssinfo.use_protection = use_protection;
239 }
240
241 if (mac->bssinfo_change && changes)
242 mac->bssinfo_change(mac->dev, changes);
243 }
244
245 void ieee80211softmac_recalc_txrates(struct ieee80211softmac_device *mac)
246 {
247 struct ieee80211softmac_txrates *txrates = &mac->txrates;
248 u32 change = 0;
249
250 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
251 txrates->default_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 0);
252
253 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
254 txrates->default_fallback = lower_rate(mac, txrates->default_rate);
255
256 change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
257 txrates->mcast_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 1);
258
259 if (mac->txrates_change)
260 mac->txrates_change(mac->dev, change);
261
262 }
263
264 void ieee80211softmac_init_bss(struct ieee80211softmac_device *mac)
265 {
266 struct ieee80211_device *ieee = mac->ieee;
267 u32 change = 0;
268 struct ieee80211softmac_txrates *txrates = &mac->txrates;
269 struct ieee80211softmac_bss_info *bssinfo = &mac->bssinfo;
270
271 /* TODO: We need some kind of state machine to lower the default rates
272 * if we loose too many packets.
273 */
274 /* Change the default txrate to the highest possible value.
275 * The txrate machine will lower it, if it is too high.
276 */
277 if (ieee->modulation & IEEE80211_OFDM_MODULATION)
278 txrates->user_rate = IEEE80211_OFDM_RATE_24MB;
279 else
280 txrates->user_rate = IEEE80211_CCK_RATE_11MB;
281
282 txrates->default_rate = IEEE80211_CCK_RATE_1MB;
283 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
284
285 txrates->default_fallback = IEEE80211_CCK_RATE_1MB;
286 change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
287
288 txrates->mcast_rate = IEEE80211_CCK_RATE_1MB;
289 change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
290
291 txrates->mgt_mcast_rate = IEEE80211_CCK_RATE_1MB;
292 change |= IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST;
293
294 if (mac->txrates_change)
295 mac->txrates_change(mac->dev, change);
296
297 change = 0;
298
299 bssinfo->supported_rates.count = 0;
300 memset(bssinfo->supported_rates.rates, 0,
301 sizeof(bssinfo->supported_rates.rates));
302 change |= IEEE80211SOFTMAC_BSSINFOCHG_RATES;
303
304 bssinfo->short_preamble = 0;
305 change |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
306
307 bssinfo->use_protection = 0;
308 change |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
309
310 if (mac->bssinfo_change)
311 mac->bssinfo_change(mac->dev, change);
312
313 mac->running = 1;
314 }
315
316 void ieee80211softmac_start(struct net_device *dev)
317 {
318 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
319
320 ieee80211softmac_start_check_rates(mac);
321 ieee80211softmac_init_bss(mac);
322 }
323 EXPORT_SYMBOL_GPL(ieee80211softmac_start);
324
325 void ieee80211softmac_stop(struct net_device *dev)
326 {
327 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
328
329 ieee80211softmac_clear_pending_work(mac);
330 }
331 EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
332
333 void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
334 {
335 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
336 unsigned long flags;
337
338 spin_lock_irqsave(&mac->lock, flags);
339 memcpy(mac->ratesinfo.rates, rates, count);
340 mac->ratesinfo.count = count;
341 spin_unlock_irqrestore(&mac->lock, flags);
342 }
343 EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
344
345 static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
346 {
347 int i;
348 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
349
350 for (i=0; i<ri->count-1; i++) {
351 if (ri->rates[i] == rate)
352 return ri->rates[i+1];
353 }
354 /* I guess we can't go any higher... */
355 return ri->rates[ri->count];
356 }
357
358 u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
359 {
360 int i;
361 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
362
363 for (i=delta; i<ri->count; i++) {
364 if (ri->rates[i] == rate)
365 return ri->rates[i-delta];
366 }
367 /* I guess we can't go any lower... */
368 return ri->rates[0];
369 }
370
371 static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
372 int amount)
373 {
374 u8 default_rate = mac->txrates.default_rate;
375 u8 default_fallback = mac->txrates.default_fallback;
376 u32 changes = 0;
377
378 //TODO: This is highly experimental code.
379 // Maybe the dynamic rate selection does not work
380 // and it has to be removed again.
381
382 printk("badness %d\n", mac->txrate_badness);
383 mac->txrate_badness += amount;
384 if (mac->txrate_badness <= -1000) {
385 /* Very small badness. Try a faster bitrate. */
386 default_rate = raise_rate(mac, default_rate);
387 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
388 default_fallback = get_fallback_rate(mac, default_rate);
389 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
390 mac->txrate_badness = 0;
391 printk("Bitrate raised to %u\n", default_rate);
392 } else if (mac->txrate_badness >= 10000) {
393 /* Very high badness. Try a slower bitrate. */
394 default_rate = lower_rate(mac, default_rate);
395 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
396 default_fallback = get_fallback_rate(mac, default_rate);
397 changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
398 mac->txrate_badness = 0;
399 printk("Bitrate lowered to %u\n", default_rate);
400 }
401
402 mac->txrates.default_rate = default_rate;
403 mac->txrates.default_fallback = default_fallback;
404
405 if (changes && mac->txrates_change)
406 mac->txrates_change(mac->dev, changes);
407 }
408
409 void ieee80211softmac_fragment_lost(struct net_device *dev,
410 u16 wl_seq)
411 {
412 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
413 unsigned long flags;
414
415 spin_lock_irqsave(&mac->lock, flags);
416 ieee80211softmac_add_txrates_badness(mac, 1000);
417 //TODO
418
419 spin_unlock_irqrestore(&mac->lock, flags);
420 }
421 EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
422
423 static int rate_cmp(const void *a_, const void *b_) {
424 u8 *a, *b;
425 a = (u8*)a_;
426 b = (u8*)b_;
427 return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
428 }
429
430 /* Allocate a softmac network struct and fill it from a network */
431 struct ieee80211softmac_network *
432 ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
433 struct ieee80211_network *net)
434 {
435 struct ieee80211softmac_network *softnet;
436 softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
437 if(softnet == NULL)
438 return NULL;
439 memcpy(softnet->bssid, net->bssid, ETH_ALEN);
440 softnet->channel = net->channel;
441 softnet->essid.len = net->ssid_len;
442 memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
443
444 /* copy rates over */
445 softnet->supported_rates.count = net->rates_len;
446 memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
447 memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
448 softnet->supported_rates.count += net->rates_ex_len;
449 sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
450
451 /* we save the ERP value because it is needed at association time, and
452 * many AP's do not include an ERP IE in the association response. */
453 softnet->erp_value = net->erp_value;
454
455 softnet->capabilities = net->capability;
456 return softnet;
457 }
458
459
460 /* Add a network to the list, while locked */
461 void
462 ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
463 struct ieee80211softmac_network *add_net)
464 {
465 struct ieee80211softmac_network *softmac_net;
466
467 list_for_each_entry(softmac_net, &mac->network_list, list) {
468 if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
469 return;
470 }
471 list_add(&(add_net->list), &mac->network_list);
472 }
473
474 /* Add a network to the list, with locking */
475 void
476 ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
477 struct ieee80211softmac_network *add_net)
478 {
479 unsigned long flags;
480 spin_lock_irqsave(&mac->lock, flags);
481 ieee80211softmac_add_network_locked(mac, add_net);
482 spin_unlock_irqrestore(&mac->lock, flags);
483 }
484
485
486 /* Delete a network from the list, while locked*/
487 void
488 ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
489 struct ieee80211softmac_network *del_net)
490 {
491 list_del(&(del_net->list));
492 }
493
494 /* Delete a network from the list with locking */
495 void
496 ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
497 struct ieee80211softmac_network *del_net)
498 {
499 unsigned long flags;
500 spin_lock_irqsave(&mac->lock, flags);
501 ieee80211softmac_del_network_locked(mac, del_net);
502 spin_unlock_irqrestore(&mac->lock, flags);
503 }
504
505 /* Get a network from the list by MAC while locked */
506 struct ieee80211softmac_network *
507 ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac,
508 u8 *bssid)
509 {
510 struct ieee80211softmac_network *softmac_net;
511
512 list_for_each_entry(softmac_net, &mac->network_list, list) {
513 if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
514 return softmac_net;
515 }
516 return NULL;
517 }
518
519 /* Get a network from the list by BSSID with locking */
520 struct ieee80211softmac_network *
521 ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac,
522 u8 *bssid)
523 {
524 unsigned long flags;
525 struct ieee80211softmac_network *softmac_net;
526
527 spin_lock_irqsave(&mac->lock, flags);
528 softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid);
529 spin_unlock_irqrestore(&mac->lock, flags);
530 return softmac_net;
531 }
532
533 /* Get a network from the list by ESSID while locked */
534 struct ieee80211softmac_network *
535 ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac,
536 struct ieee80211softmac_essid *essid)
537 {
538 struct ieee80211softmac_network *softmac_net;
539
540 list_for_each_entry(softmac_net, &mac->network_list, list) {
541 if (softmac_net->essid.len == essid->len &&
542 !memcmp(softmac_net->essid.data, essid->data, essid->len))
543 return softmac_net;
544 }
545 return NULL;
546 }
547
548 /* Get a network from the list by ESSID with locking */
549 struct ieee80211softmac_network *
550 ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac,
551 struct ieee80211softmac_essid *essid)
552 {
553 unsigned long flags;
554 struct ieee80211softmac_network *softmac_net = NULL;
555
556 spin_lock_irqsave(&mac->lock, flags);
557 softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid);
558 spin_unlock_irqrestore(&mac->lock, flags);
559 return softmac_net;
560 }
561
562 MODULE_LICENSE("GPL");
563 MODULE_AUTHOR("Johannes Berg");
564 MODULE_AUTHOR("Joseph Jezak");
565 MODULE_AUTHOR("Larry Finger");
566 MODULE_AUTHOR("Danny van Dyk");
567 MODULE_AUTHOR("Michael Buesch");
568 MODULE_DESCRIPTION("802.11 software MAC");
WRT350N Kernel Patches