2 * Contains some basic softmac functions along with module registration code etc.
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>
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.
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
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
23 * The full GNU General Public License is included in this distribution in the
24 * file called COPYING.
27 #include "ieee80211softmac_priv.h"
28 #include <linux/sort.h>
30 struct net_device *alloc_ieee80211softmac(int sizeof_priv)
32 struct ieee80211softmac_device *softmac;
33 struct net_device *dev;
35 dev = alloc_ieee80211(sizeof(struct ieee80211softmac_device) + sizeof_priv);
36 softmac = ieee80211_priv(dev);
38 softmac->ieee = netdev_priv(dev);
39 spin_lock_init(&softmac->lock);
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;
47 /* TODO: initialise all the other callbacks in the ieee struct
48 * (once they're written)
51 INIT_LIST_HEAD(&softmac->auth_queue);
52 INIT_LIST_HEAD(&softmac->network_list);
53 INIT_LIST_HEAD(&softmac->events);
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;
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;
69 /* to start with, we can't send anything ... */
70 netif_carrier_off(dev);
75 /* Clears the pending work queue items, stops all scans, etc. */
77 ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
80 struct ieee80211softmac_event *eventptr, *eventtmp;
81 struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
82 struct ieee80211softmac_network *netptr, *nettmp;
84 ieee80211softmac_stop_scan(sm);
85 ieee80211softmac_wait_for_scan(sm);
87 spin_lock_irqsave(&sm->lock, flags);
88 /* Free all pending assoc work items */
89 cancel_delayed_work(&sm->associnfo.work);
91 /* Free all pending scan work items */
92 if(sm->scaninfo != NULL)
93 cancel_delayed_work(&sm->scaninfo->softmac_scan);
95 /* Free all pending auth work items */
96 list_for_each_entry(authptr, &sm->auth_queue, list)
97 cancel_delayed_work(&authptr->work);
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);
103 spin_unlock_irqrestore(&sm->lock, flags);
104 flush_scheduled_work();
106 /* now we should be save and no longer need locking... */
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);
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);
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);
128 spin_unlock_irqrestore(&sm->lock, flags);
131 void free_ieee80211softmac(struct net_device *dev)
133 struct ieee80211softmac_device *sm = ieee80211_priv(dev);
134 ieee80211softmac_clear_pending_work(sm);
140 static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
142 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
143 /* I took out the sorting check, we're seperating by modulation now. */
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;
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;
165 void ieee80211softmac_start(struct net_device *dev)
167 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
168 struct ieee80211_device *ieee = mac->ieee;
170 struct ieee80211softmac_txrates oldrates;
172 ieee80211softmac_start_check_rates(mac);
174 /* TODO: We need some kind of state machine to lower the default rates
175 * if we loose too many packets.
177 /* Change the default txrate to the highest possible value.
178 * The txrate machine will lower it, if it is too high.
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;
194 if (mac->txrates_change)
195 mac->txrates_change(dev, change, &oldrates);
198 void ieee80211softmac_stop(struct net_device *dev)
200 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
202 ieee80211softmac_clear_pending_work(mac);
205 void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
207 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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);
216 static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
219 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
221 for (i=0; i<ri->count-1; i++) {
222 if (ri->rates[i] == rate)
223 return ri->rates[i+1];
225 /* I guess we can't go any higher... */
226 return ri->rates[ri->count];
229 u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
232 struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
234 for (i=delta; i<ri->count; i++) {
235 if (ri->rates[i] == rate)
236 return ri->rates[i-delta];
238 /* I guess we can't go any lower... */
242 static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
245 struct ieee80211softmac_txrates oldrates;
246 u8 default_rate = mac->txrates.default_rate;
247 u8 default_fallback = mac->txrates.default_fallback;
250 //TODO: This is highly experimental code.
251 // Maybe the dynamic rate selection does not work
252 // and it has to be removed again.
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);
278 mac->txrates.default_rate = default_rate;
279 mac->txrates.default_fallback = default_fallback;
281 if (changes && mac->txrates_change)
282 mac->txrates_change(mac->dev, changes, &oldrates);
285 void ieee80211softmac_fragment_lost(struct net_device *dev,
288 struct ieee80211softmac_device *mac = ieee80211_priv(dev);
291 spin_lock_irqsave(&mac->lock, flags);
292 ieee80211softmac_add_txrates_badness(mac, 1000);
295 spin_unlock_irqrestore(&mac->lock, flags);
298 static int rate_cmp(const void *a_, const void *b_) {
302 return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
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)
310 struct ieee80211softmac_network *softnet;
311 softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
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);
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);
326 softnet->capabilities = net->capability;
331 /* Add a network to the list, while locked */
333 ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
334 struct ieee80211softmac_network *add_net)
336 struct list_head *list_ptr;
337 struct ieee80211softmac_network *softmac_net = NULL;
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))
346 if(softmac_net == NULL)
347 list_add(&(add_net->list), &mac->network_list);
350 /* Add a network to the list, with locking */
352 ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
353 struct ieee80211softmac_network *add_net)
356 spin_lock_irqsave(&mac->lock, flags);
357 ieee80211softmac_add_network_locked(mac, add_net);
358 spin_unlock_irqrestore(&mac->lock, flags);
362 /* Delete a network from the list, while locked*/
364 ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
365 struct ieee80211softmac_network *del_net)
367 list_del(&(del_net->list));
370 /* Delete a network from the list with locking */
372 ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
373 struct ieee80211softmac_network *del_net)
376 spin_lock_irqsave(&mac->lock, flags);
377 ieee80211softmac_del_network_locked(mac, del_net);
378 spin_unlock_irqrestore(&mac->lock, flags);
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,
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))
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,
404 struct ieee80211softmac_network *softmac_net;
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);
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)
417 struct list_head *list_ptr;
418 struct ieee80211softmac_network *softmac_net = NULL;
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))
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)
435 struct ieee80211softmac_network *softmac_net = NULL;
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);
443 MODULE_LICENSE("GPL");
445 EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
446 EXPORT_SYMBOL_GPL(free_ieee80211softmac);
447 EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
448 EXPORT_SYMBOL_GPL(ieee80211softmac_start);
449 EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
450 EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
451 EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);