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4855d25b JB |
1 | /* |
2 | * Contains some basic softmac functions along with module registration code etc. | |
3 | * | |
4 | * Copyright (c) 2005 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 | ||
370121e5 JB |
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 | ||
370121e5 JB |
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 | ||
2dd50801 JB |
69 | /* to start with, we can't send anything ... */ |
70 | netif_carrier_off(dev); | |
370121e5 | 71 | |
370121e5 | 72 | return dev; |
370121e5 JB |
73 | } |
74 | ||
75 | /* Clears the pending work queue items, stops all scans, etc. */ | |
76 | void | |
77 | ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm) | |
78 | { | |
79 | unsigned long flags; | |
80 | struct ieee80211softmac_event *eventptr, *eventtmp; | |
81 | struct ieee80211softmac_auth_queue_item *authptr, *authtmp; | |
82 | struct ieee80211softmac_network *netptr, *nettmp; | |
83 | ||
84 | ieee80211softmac_stop_scan(sm); | |
85 | ieee80211softmac_wait_for_scan(sm); | |
86 | ||
87 | spin_lock_irqsave(&sm->lock, flags); | |
88 | /* Free all pending assoc work items */ | |
89 | cancel_delayed_work(&sm->associnfo.work); | |
90 | ||
91 | /* Free all pending scan work items */ | |
92 | if(sm->scaninfo != NULL) | |
93 | cancel_delayed_work(&sm->scaninfo->softmac_scan); | |
94 | ||
95 | /* Free all pending auth work items */ | |
96 | list_for_each_entry(authptr, &sm->auth_queue, list) | |
97 | cancel_delayed_work(&authptr->work); | |
98 | ||
99 | /* delete all pending event calls and work items */ | |
100 | list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) | |
101 | cancel_delayed_work(&eventptr->work); | |
102 | ||
103 | spin_unlock_irqrestore(&sm->lock, flags); | |
5c4df6da | 104 | flush_scheduled_work(); |
370121e5 | 105 | |
b2b9b651 | 106 | /* now we should be save and no longer need locking... */ |
370121e5 JB |
107 | spin_lock_irqsave(&sm->lock, flags); |
108 | /* Free all pending auth work items */ | |
109 | list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) { | |
110 | list_del(&authptr->list); | |
111 | kfree(authptr); | |
112 | } | |
113 | ||
114 | /* delete all pending event calls and work items */ | |
115 | list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) { | |
116 | list_del(&eventptr->list); | |
117 | kfree(eventptr); | |
118 | } | |
119 | ||
120 | /* Free all networks */ | |
121 | list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) { | |
122 | ieee80211softmac_del_network_locked(sm, netptr); | |
123 | if(netptr->challenge != NULL) | |
124 | kfree(netptr->challenge); | |
125 | kfree(netptr); | |
126 | } | |
127 | ||
128 | spin_unlock_irqrestore(&sm->lock, flags); | |
129 | } | |
130 | ||
131 | void free_ieee80211softmac(struct net_device *dev) | |
132 | { | |
133 | struct ieee80211softmac_device *sm = ieee80211_priv(dev); | |
134 | ieee80211softmac_clear_pending_work(sm); | |
370121e5 JB |
135 | kfree(sm->scaninfo); |
136 | kfree(sm->wpa.IE); | |
137 | free_ieee80211(dev); | |
138 | } | |
139 | ||
140 | static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac) | |
141 | { | |
142 | struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo; | |
143 | /* I took out the sorting check, we're seperating by modulation now. */ | |
144 | if (ri->count) | |
145 | return; | |
146 | /* otherwise assume we hav'em all! */ | |
147 | if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) { | |
148 | ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB; | |
149 | ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB; | |
150 | ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB; | |
151 | ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB; | |
152 | } | |
153 | if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) { | |
154 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB; | |
155 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB; | |
156 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB; | |
157 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB; | |
158 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB; | |
159 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB; | |
160 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB; | |
161 | ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB; | |
162 | } | |
163 | } | |
164 | ||
165 | void ieee80211softmac_start(struct net_device *dev) | |
166 | { | |
167 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
168 | struct ieee80211_device *ieee = mac->ieee; | |
169 | u32 change = 0; | |
170 | struct ieee80211softmac_txrates oldrates; | |
171 | ||
172 | ieee80211softmac_start_check_rates(mac); | |
173 | ||
174 | /* TODO: We need some kind of state machine to lower the default rates | |
175 | * if we loose too many packets. | |
176 | */ | |
177 | /* Change the default txrate to the highest possible value. | |
178 | * The txrate machine will lower it, if it is too high. | |
179 | */ | |
180 | if (mac->txrates_change) | |
181 | oldrates = mac->txrates; | |
182 | if (ieee->modulation & IEEE80211_OFDM_MODULATION) { | |
183 | mac->txrates.default_rate = IEEE80211_OFDM_RATE_54MB; | |
184 | change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; | |
185 | mac->txrates.default_fallback = IEEE80211_OFDM_RATE_24MB; | |
186 | change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK; | |
187 | } else if (ieee->modulation & IEEE80211_CCK_MODULATION) { | |
188 | mac->txrates.default_rate = IEEE80211_CCK_RATE_11MB; | |
189 | change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; | |
190 | mac->txrates.default_fallback = IEEE80211_CCK_RATE_5MB; | |
191 | change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK; | |
192 | } else | |
193 | assert(0); | |
194 | if (mac->txrates_change) | |
195 | mac->txrates_change(dev, change, &oldrates); | |
196 | } | |
197 | ||
198 | void ieee80211softmac_stop(struct net_device *dev) | |
199 | { | |
200 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
201 | ||
202 | ieee80211softmac_clear_pending_work(mac); | |
203 | } | |
204 | ||
205 | void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates) | |
206 | { | |
207 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
208 | unsigned long flags; | |
209 | ||
210 | spin_lock_irqsave(&mac->lock, flags); | |
211 | memcpy(mac->ratesinfo.rates, rates, count); | |
212 | mac->ratesinfo.count = count; | |
213 | spin_unlock_irqrestore(&mac->lock, flags); | |
214 | } | |
215 | ||
216 | static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate) | |
217 | { | |
218 | int i; | |
219 | struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo; | |
220 | ||
221 | for (i=0; i<ri->count-1; i++) { | |
222 | if (ri->rates[i] == rate) | |
223 | return ri->rates[i+1]; | |
224 | } | |
225 | /* I guess we can't go any higher... */ | |
226 | return ri->rates[ri->count]; | |
227 | } | |
228 | ||
229 | u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta) | |
230 | { | |
231 | int i; | |
232 | struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo; | |
233 | ||
234 | for (i=delta; i<ri->count; i++) { | |
235 | if (ri->rates[i] == rate) | |
236 | return ri->rates[i-delta]; | |
237 | } | |
238 | /* I guess we can't go any lower... */ | |
239 | return ri->rates[0]; | |
240 | } | |
241 | ||
242 | static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac, | |
243 | int amount) | |
244 | { | |
245 | struct ieee80211softmac_txrates oldrates; | |
246 | u8 default_rate = mac->txrates.default_rate; | |
247 | u8 default_fallback = mac->txrates.default_fallback; | |
248 | u32 changes = 0; | |
249 | ||
250 | //TODO: This is highly experimental code. | |
251 | // Maybe the dynamic rate selection does not work | |
252 | // and it has to be removed again. | |
253 | ||
254 | printk("badness %d\n", mac->txrate_badness); | |
255 | mac->txrate_badness += amount; | |
256 | if (mac->txrate_badness <= -1000) { | |
257 | /* Very small badness. Try a faster bitrate. */ | |
258 | if (mac->txrates_change) | |
259 | memcpy(&oldrates, &mac->txrates, sizeof(oldrates)); | |
260 | default_rate = raise_rate(mac, default_rate); | |
261 | changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; | |
262 | default_fallback = get_fallback_rate(mac, default_rate); | |
263 | changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK; | |
264 | mac->txrate_badness = 0; | |
265 | printk("Bitrate raised to %u\n", default_rate); | |
266 | } else if (mac->txrate_badness >= 10000) { | |
267 | /* Very high badness. Try a slower bitrate. */ | |
268 | if (mac->txrates_change) | |
269 | memcpy(&oldrates, &mac->txrates, sizeof(oldrates)); | |
270 | default_rate = lower_rate(mac, default_rate); | |
271 | changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT; | |
272 | default_fallback = get_fallback_rate(mac, default_rate); | |
273 | changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK; | |
274 | mac->txrate_badness = 0; | |
275 | printk("Bitrate lowered to %u\n", default_rate); | |
276 | } | |
277 | ||
278 | mac->txrates.default_rate = default_rate; | |
279 | mac->txrates.default_fallback = default_fallback; | |
280 | ||
281 | if (changes && mac->txrates_change) | |
282 | mac->txrates_change(mac->dev, changes, &oldrates); | |
283 | } | |
284 | ||
285 | void ieee80211softmac_fragment_lost(struct net_device *dev, | |
286 | u16 wl_seq) | |
287 | { | |
288 | struct ieee80211softmac_device *mac = ieee80211_priv(dev); | |
289 | unsigned long flags; | |
290 | ||
291 | spin_lock_irqsave(&mac->lock, flags); | |
292 | ieee80211softmac_add_txrates_badness(mac, 1000); | |
293 | //TODO | |
294 | ||
295 | spin_unlock_irqrestore(&mac->lock, flags); | |
296 | } | |
297 | ||
298 | static int rate_cmp(const void *a_, const void *b_) { | |
299 | u8 *a, *b; | |
300 | a = (u8*)a_; | |
301 | b = (u8*)b_; | |
302 | return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK)); | |
303 | } | |
304 | ||
305 | /* Allocate a softmac network struct and fill it from a network */ | |
306 | struct ieee80211softmac_network * | |
307 | ieee80211softmac_create_network(struct ieee80211softmac_device *mac, | |
308 | struct ieee80211_network *net) | |
309 | { | |
310 | struct ieee80211softmac_network *softnet; | |
311 | softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC); | |
312 | if(softnet == NULL) | |
313 | return NULL; | |
314 | memcpy(softnet->bssid, net->bssid, ETH_ALEN); | |
315 | softnet->channel = net->channel; | |
316 | softnet->essid.len = net->ssid_len; | |
317 | memcpy(softnet->essid.data, net->ssid, softnet->essid.len); | |
318 | ||
319 | /* copy rates over */ | |
320 | softnet->supported_rates.count = net->rates_len; | |
321 | memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len); | |
322 | memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len); | |
323 | softnet->supported_rates.count += net->rates_ex_len; | |
324 | sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL); | |
325 | ||
326 | softnet->capabilities = net->capability; | |
327 | return softnet; | |
328 | } | |
329 | ||
330 | ||
331 | /* Add a network to the list, while locked */ | |
332 | void | |
333 | ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac, | |
334 | struct ieee80211softmac_network *add_net) | |
335 | { | |
336 | struct list_head *list_ptr; | |
337 | struct ieee80211softmac_network *softmac_net = NULL; | |
338 | ||
339 | list_for_each(list_ptr, &mac->network_list) { | |
340 | softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list); | |
341 | if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN)) | |
342 | break; | |
343 | else | |
344 | softmac_net = NULL; | |
345 | } | |
346 | if(softmac_net == NULL) | |
347 | list_add(&(add_net->list), &mac->network_list); | |
348 | } | |
349 | ||
350 | /* Add a network to the list, with locking */ | |
351 | void | |
352 | ieee80211softmac_add_network(struct ieee80211softmac_device *mac, | |
353 | struct ieee80211softmac_network *add_net) | |
354 | { | |
355 | unsigned long flags; | |
356 | spin_lock_irqsave(&mac->lock, flags); | |
357 | ieee80211softmac_add_network_locked(mac, add_net); | |
358 | spin_unlock_irqrestore(&mac->lock, flags); | |
359 | } | |
360 | ||
361 | ||
362 | /* Delete a network from the list, while locked*/ | |
363 | void | |
364 | ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac, | |
365 | struct ieee80211softmac_network *del_net) | |
366 | { | |
367 | list_del(&(del_net->list)); | |
368 | } | |
369 | ||
370 | /* Delete a network from the list with locking */ | |
371 | void | |
372 | ieee80211softmac_del_network(struct ieee80211softmac_device *mac, | |
373 | struct ieee80211softmac_network *del_net) | |
374 | { | |
375 | unsigned long flags; | |
376 | spin_lock_irqsave(&mac->lock, flags); | |
377 | ieee80211softmac_del_network_locked(mac, del_net); | |
378 | spin_unlock_irqrestore(&mac->lock, flags); | |
379 | } | |
380 | ||
381 | /* Get a network from the list by MAC while locked */ | |
382 | struct ieee80211softmac_network * | |
383 | ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac, | |
384 | u8 *bssid) | |
385 | { | |
386 | struct list_head *list_ptr; | |
387 | struct ieee80211softmac_network *softmac_net = NULL; | |
388 | list_for_each(list_ptr, &mac->network_list) { | |
389 | softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list); | |
390 | if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN)) | |
391 | break; | |
392 | else | |
393 | softmac_net = NULL; | |
394 | } | |
395 | return softmac_net; | |
396 | } | |
397 | ||
398 | /* Get a network from the list by BSSID with locking */ | |
399 | struct ieee80211softmac_network * | |
400 | ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac, | |
401 | u8 *bssid) | |
402 | { | |
403 | unsigned long flags; | |
404 | struct ieee80211softmac_network *softmac_net; | |
405 | ||
406 | spin_lock_irqsave(&mac->lock, flags); | |
407 | softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid); | |
408 | spin_unlock_irqrestore(&mac->lock, flags); | |
409 | return softmac_net; | |
410 | } | |
411 | ||
412 | /* Get a network from the list by ESSID while locked */ | |
413 | struct ieee80211softmac_network * | |
414 | ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac, | |
415 | struct ieee80211softmac_essid *essid) | |
416 | { | |
417 | struct list_head *list_ptr; | |
418 | struct ieee80211softmac_network *softmac_net = NULL; | |
419 | ||
420 | list_for_each(list_ptr, &mac->network_list) { | |
421 | softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list); | |
422 | if (softmac_net->essid.len == essid->len && | |
423 | !memcmp(softmac_net->essid.data, essid->data, essid->len)) | |
424 | return softmac_net; | |
425 | } | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | /* Get a network from the list by ESSID with locking */ | |
430 | struct ieee80211softmac_network * | |
431 | ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac, | |
432 | struct ieee80211softmac_essid *essid) | |
433 | { | |
434 | unsigned long flags; | |
435 | struct ieee80211softmac_network *softmac_net = NULL; | |
436 | ||
437 | spin_lock_irqsave(&mac->lock, flags); | |
438 | softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid); | |
439 | spin_unlock_irqrestore(&mac->lock, flags); | |
440 | return softmac_net; | |
441 | } | |
442 | ||
443 | MODULE_LICENSE("GPL"); | |
9ebdd466 JB |
444 | MODULE_AUTHOR("Johannes Berg"); |
445 | MODULE_AUTHOR("Joseph Jezak"); | |
446 | MODULE_AUTHOR("Larry Finger"); | |
447 | MODULE_AUTHOR("Danny van Dyk"); | |
448 | MODULE_AUTHOR("Michael Buesch"); | |
449 | MODULE_DESCRIPTION("802.11 software MAC"); | |
370121e5 JB |
450 | |
451 | EXPORT_SYMBOL_GPL(alloc_ieee80211softmac); | |
452 | EXPORT_SYMBOL_GPL(free_ieee80211softmac); | |
453 | EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates); | |
454 | EXPORT_SYMBOL_GPL(ieee80211softmac_start); | |
455 | EXPORT_SYMBOL_GPL(ieee80211softmac_stop); | |
456 | EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost); | |
457 | EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work); |