d4426748ab10c857a3b690f0953b413360f33609
[linux-2.6.git] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/wireless.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/bitmap.h>
23 #include <linux/pm_qos_params.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35
36
37 bool ieee80211_disable_40mhz_24ghz;
38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40                  "Disable 40MHz support in the 2.4GHz band");
41
42 void ieee80211_configure_filter(struct ieee80211_local *local)
43 {
44         u64 mc;
45         unsigned int changed_flags;
46         unsigned int new_flags = 0;
47
48         if (atomic_read(&local->iff_promiscs))
49                 new_flags |= FIF_PROMISC_IN_BSS;
50
51         if (atomic_read(&local->iff_allmultis))
52                 new_flags |= FIF_ALLMULTI;
53
54         if (local->monitors || local->scanning)
55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
56
57         if (local->fif_fcsfail)
58                 new_flags |= FIF_FCSFAIL;
59
60         if (local->fif_plcpfail)
61                 new_flags |= FIF_PLCPFAIL;
62
63         if (local->fif_control)
64                 new_flags |= FIF_CONTROL;
65
66         if (local->fif_other_bss)
67                 new_flags |= FIF_OTHER_BSS;
68
69         if (local->fif_pspoll)
70                 new_flags |= FIF_PSPOLL;
71
72         spin_lock_bh(&local->filter_lock);
73         changed_flags = local->filter_flags ^ new_flags;
74
75         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
76         spin_unlock_bh(&local->filter_lock);
77
78         /* be a bit nasty */
79         new_flags |= (1<<31);
80
81         drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83         WARN_ON(new_flags & (1<<31));
84
85         local->filter_flags = new_flags & ~(1<<31);
86 }
87
88 static void ieee80211_reconfig_filter(struct work_struct *work)
89 {
90         struct ieee80211_local *local =
91                 container_of(work, struct ieee80211_local, reconfig_filter);
92
93         ieee80211_configure_filter(local);
94 }
95
96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97 {
98         struct ieee80211_channel *chan, *scan_chan;
99         int ret = 0;
100         int power;
101         enum nl80211_channel_type channel_type;
102
103         might_sleep();
104
105         scan_chan = local->scan_channel;
106
107         if (scan_chan) {
108                 chan = scan_chan;
109                 channel_type = NL80211_CHAN_NO_HT;
110         } else {
111                 chan = local->oper_channel;
112                 channel_type = local->oper_channel_type;
113         }
114
115         if (chan != local->hw.conf.channel ||
116             channel_type != local->hw.conf.channel_type) {
117                 local->hw.conf.channel = chan;
118                 local->hw.conf.channel_type = channel_type;
119                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
120         }
121
122         if (!conf_is_ht(&local->hw.conf)) {
123                 /*
124                  * mac80211.h documents that this is only valid
125                  * when the channel is set to an HT type, and
126                  * that otherwise STATIC is used.
127                  */
128                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
129         } else if (local->hw.conf.smps_mode != local->smps_mode) {
130                 local->hw.conf.smps_mode = local->smps_mode;
131                 changed |= IEEE80211_CONF_CHANGE_SMPS;
132         }
133
134         if (scan_chan)
135                 power = chan->max_power;
136         else
137                 power = local->power_constr_level ?
138                         (chan->max_power - local->power_constr_level) :
139                         chan->max_power;
140
141         if (local->user_power_level >= 0)
142                 power = min(power, local->user_power_level);
143
144         if (local->hw.conf.power_level != power) {
145                 changed |= IEEE80211_CONF_CHANGE_POWER;
146                 local->hw.conf.power_level = power;
147         }
148
149         if (changed && local->open_count) {
150                 ret = drv_config(local, changed);
151                 /*
152                  * Goal:
153                  * HW reconfiguration should never fail, the driver has told
154                  * us what it can support so it should live up to that promise.
155                  *
156                  * Current status:
157                  * rfkill is not integrated with mac80211 and a
158                  * configuration command can thus fail if hardware rfkill
159                  * is enabled
160                  *
161                  * FIXME: integrate rfkill with mac80211 and then add this
162                  * WARN_ON() back
163                  *
164                  */
165                 /* WARN_ON(ret); */
166         }
167
168         return ret;
169 }
170
171 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
172                                       u32 changed)
173 {
174         struct ieee80211_local *local = sdata->local;
175         static const u8 zero[ETH_ALEN] = { 0 };
176
177         if (!changed)
178                 return;
179
180         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
181                 /*
182                  * While not associated, claim a BSSID of all-zeroes
183                  * so that drivers don't do any weird things with the
184                  * BSSID at that time.
185                  */
186                 if (sdata->vif.bss_conf.assoc)
187                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
188                 else
189                         sdata->vif.bss_conf.bssid = zero;
190         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
191                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
192         else if (sdata->vif.type == NL80211_IFTYPE_AP)
193                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
194         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
195                 sdata->vif.bss_conf.bssid = zero;
196         } else {
197                 WARN_ON(1);
198                 return;
199         }
200
201         switch (sdata->vif.type) {
202         case NL80211_IFTYPE_AP:
203         case NL80211_IFTYPE_ADHOC:
204         case NL80211_IFTYPE_MESH_POINT:
205                 break;
206         default:
207                 /* do not warn to simplify caller in scan.c */
208                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
209                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
210                         return;
211                 break;
212         }
213
214         if (changed & BSS_CHANGED_BEACON_ENABLED) {
215                 if (local->quiescing || !netif_running(sdata->dev) ||
216                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
217                         sdata->vif.bss_conf.enable_beacon = false;
218                 } else {
219                         /*
220                          * Beacon should be enabled, but AP mode must
221                          * check whether there is a beacon configured.
222                          */
223                         switch (sdata->vif.type) {
224                         case NL80211_IFTYPE_AP:
225                                 sdata->vif.bss_conf.enable_beacon =
226                                         !!rcu_dereference(sdata->u.ap.beacon);
227                                 break;
228                         case NL80211_IFTYPE_ADHOC:
229                                 sdata->vif.bss_conf.enable_beacon =
230                                         !!rcu_dereference(sdata->u.ibss.presp);
231                                 break;
232                         case NL80211_IFTYPE_MESH_POINT:
233                                 sdata->vif.bss_conf.enable_beacon = true;
234                                 break;
235                         default:
236                                 /* not reached */
237                                 WARN_ON(1);
238                                 break;
239                         }
240                 }
241         }
242
243         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
244 }
245
246 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
247 {
248         sdata->vif.bss_conf.use_cts_prot = false;
249         sdata->vif.bss_conf.use_short_preamble = false;
250         sdata->vif.bss_conf.use_short_slot = false;
251         return BSS_CHANGED_ERP_CTS_PROT |
252                BSS_CHANGED_ERP_PREAMBLE |
253                BSS_CHANGED_ERP_SLOT;
254 }
255
256 static void ieee80211_tasklet_handler(unsigned long data)
257 {
258         struct ieee80211_local *local = (struct ieee80211_local *) data;
259         struct sk_buff *skb;
260         struct ieee80211_ra_tid *ra_tid;
261
262         while ((skb = skb_dequeue(&local->skb_queue)) ||
263                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
264                 switch (skb->pkt_type) {
265                 case IEEE80211_RX_MSG:
266                         /* Clear skb->pkt_type in order to not confuse kernel
267                          * netstack. */
268                         skb->pkt_type = 0;
269                         ieee80211_rx(local_to_hw(local), skb);
270                         break;
271                 case IEEE80211_TX_STATUS_MSG:
272                         skb->pkt_type = 0;
273                         ieee80211_tx_status(local_to_hw(local), skb);
274                         break;
275                 case IEEE80211_DELBA_MSG:
276                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
277                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
278                                                 ra_tid->tid);
279                         dev_kfree_skb(skb);
280                         break;
281                 case IEEE80211_ADDBA_MSG:
282                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
283                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
284                                                  ra_tid->tid);
285                         dev_kfree_skb(skb);
286                         break ;
287                 default:
288                         WARN(1, "mac80211: Packet is of unknown type %d\n",
289                              skb->pkt_type);
290                         dev_kfree_skb(skb);
291                         break;
292                 }
293         }
294 }
295
296 static void ieee80211_restart_work(struct work_struct *work)
297 {
298         struct ieee80211_local *local =
299                 container_of(work, struct ieee80211_local, restart_work);
300
301         rtnl_lock();
302         ieee80211_reconfig(local);
303         rtnl_unlock();
304 }
305
306 void ieee80211_restart_hw(struct ieee80211_hw *hw)
307 {
308         struct ieee80211_local *local = hw_to_local(hw);
309
310         /* use this reason, __ieee80211_resume will unblock it */
311         ieee80211_stop_queues_by_reason(hw,
312                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
313
314         schedule_work(&local->restart_work);
315 }
316 EXPORT_SYMBOL(ieee80211_restart_hw);
317
318 static void ieee80211_recalc_smps_work(struct work_struct *work)
319 {
320         struct ieee80211_local *local =
321                 container_of(work, struct ieee80211_local, recalc_smps);
322
323         mutex_lock(&local->iflist_mtx);
324         ieee80211_recalc_smps(local, NULL);
325         mutex_unlock(&local->iflist_mtx);
326 }
327
328 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
329                                         const struct ieee80211_ops *ops)
330 {
331         struct ieee80211_local *local;
332         int priv_size, i;
333         struct wiphy *wiphy;
334
335         /* Ensure 32-byte alignment of our private data and hw private data.
336          * We use the wiphy priv data for both our ieee80211_local and for
337          * the driver's private data
338          *
339          * In memory it'll be like this:
340          *
341          * +-------------------------+
342          * | struct wiphy           |
343          * +-------------------------+
344          * | struct ieee80211_local  |
345          * +-------------------------+
346          * | driver's private data   |
347          * +-------------------------+
348          *
349          */
350         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
351
352         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
353
354         if (!wiphy)
355                 return NULL;
356
357         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
358                         WIPHY_FLAG_4ADDR_AP |
359                         WIPHY_FLAG_4ADDR_STATION;
360         wiphy->privid = mac80211_wiphy_privid;
361
362         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
363         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
364                                sizeof(struct cfg80211_bss);
365
366         local = wiphy_priv(wiphy);
367
368         local->hw.wiphy = wiphy;
369
370         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
371
372         BUG_ON(!ops->tx);
373         BUG_ON(!ops->start);
374         BUG_ON(!ops->stop);
375         BUG_ON(!ops->config);
376         BUG_ON(!ops->add_interface);
377         BUG_ON(!ops->remove_interface);
378         BUG_ON(!ops->configure_filter);
379         local->ops = ops;
380
381         /* set up some defaults */
382         local->hw.queues = 1;
383         local->hw.max_rates = 1;
384         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
385         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
386         local->user_power_level = -1;
387
388         INIT_LIST_HEAD(&local->interfaces);
389         mutex_init(&local->iflist_mtx);
390         mutex_init(&local->scan_mtx);
391
392         spin_lock_init(&local->key_lock);
393         spin_lock_init(&local->filter_lock);
394         spin_lock_init(&local->queue_stop_reason_lock);
395
396         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
397
398         INIT_WORK(&local->restart_work, ieee80211_restart_work);
399
400         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
401         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
402         local->smps_mode = IEEE80211_SMPS_OFF;
403
404         INIT_WORK(&local->dynamic_ps_enable_work,
405                   ieee80211_dynamic_ps_enable_work);
406         INIT_WORK(&local->dynamic_ps_disable_work,
407                   ieee80211_dynamic_ps_disable_work);
408         setup_timer(&local->dynamic_ps_timer,
409                     ieee80211_dynamic_ps_timer, (unsigned long) local);
410
411         sta_info_init(local);
412
413         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
414                 skb_queue_head_init(&local->pending[i]);
415         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
416                      (unsigned long)local);
417
418         tasklet_init(&local->tasklet,
419                      ieee80211_tasklet_handler,
420                      (unsigned long) local);
421
422         skb_queue_head_init(&local->skb_queue);
423         skb_queue_head_init(&local->skb_queue_unreliable);
424
425         spin_lock_init(&local->ampdu_lock);
426
427         return local_to_hw(local);
428 }
429 EXPORT_SYMBOL(ieee80211_alloc_hw);
430
431 int ieee80211_register_hw(struct ieee80211_hw *hw)
432 {
433         struct ieee80211_local *local = hw_to_local(hw);
434         int result;
435         enum ieee80211_band band;
436         int channels, i, j, max_bitrates;
437         bool supp_ht;
438         static const u32 cipher_suites[] = {
439                 WLAN_CIPHER_SUITE_WEP40,
440                 WLAN_CIPHER_SUITE_WEP104,
441                 WLAN_CIPHER_SUITE_TKIP,
442                 WLAN_CIPHER_SUITE_CCMP,
443
444                 /* keep last -- depends on hw flags! */
445                 WLAN_CIPHER_SUITE_AES_CMAC
446         };
447
448         /*
449          * generic code guarantees at least one band,
450          * set this very early because much code assumes
451          * that hw.conf.channel is assigned
452          */
453         channels = 0;
454         max_bitrates = 0;
455         supp_ht = false;
456         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
457                 struct ieee80211_supported_band *sband;
458
459                 sband = local->hw.wiphy->bands[band];
460                 if (!sband)
461                         continue;
462                 if (!local->oper_channel) {
463                         /* init channel we're on */
464                         local->hw.conf.channel =
465                         local->oper_channel = &sband->channels[0];
466                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
467                 }
468                 channels += sband->n_channels;
469
470                 if (max_bitrates < sband->n_bitrates)
471                         max_bitrates = sband->n_bitrates;
472                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
473         }
474
475         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
476                                       sizeof(void *) * channels, GFP_KERNEL);
477         if (!local->int_scan_req)
478                 return -ENOMEM;
479
480         /* if low-level driver supports AP, we also support VLAN */
481         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
482                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
483
484         /* mac80211 always supports monitor */
485         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
486
487         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
488                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
489         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
490                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
491
492         /*
493          * Calculate scan IE length -- we need this to alloc
494          * memory and to subtract from the driver limit. It
495          * includes the (extended) supported rates and HT
496          * information -- SSID is the driver's responsibility.
497          */
498         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
499         if (supp_ht)
500                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
501
502         if (!local->ops->hw_scan) {
503                 /* For hw_scan, driver needs to set these up. */
504                 local->hw.wiphy->max_scan_ssids = 4;
505                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
506         }
507
508         /*
509          * If the driver supports any scan IEs, then assume the
510          * limit includes the IEs mac80211 will add, otherwise
511          * leave it at zero and let the driver sort it out; we
512          * still pass our IEs to the driver but userspace will
513          * not be allowed to in that case.
514          */
515         if (local->hw.wiphy->max_scan_ie_len)
516                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
517
518         local->hw.wiphy->cipher_suites = cipher_suites;
519         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
520         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
521                 local->hw.wiphy->n_cipher_suites--;
522
523         result = wiphy_register(local->hw.wiphy);
524         if (result < 0)
525                 goto fail_wiphy_register;
526
527         /*
528          * We use the number of queues for feature tests (QoS, HT) internally
529          * so restrict them appropriately.
530          */
531         if (hw->queues > IEEE80211_MAX_QUEUES)
532                 hw->queues = IEEE80211_MAX_QUEUES;
533
534         local->workqueue =
535                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
536         if (!local->workqueue) {
537                 result = -ENOMEM;
538                 goto fail_workqueue;
539         }
540
541         /*
542          * The hardware needs headroom for sending the frame,
543          * and we need some headroom for passing the frame to monitor
544          * interfaces, but never both at the same time.
545          */
546         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
547                         sizeof(struct ieee80211_tx_status_rtap_hdr));
548         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
549                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
550
551         debugfs_hw_add(local);
552
553         if (local->hw.max_listen_interval == 0)
554                 local->hw.max_listen_interval = 1;
555
556         local->hw.conf.listen_interval = local->hw.max_listen_interval;
557
558         result = sta_info_start(local);
559         if (result < 0)
560                 goto fail_sta_info;
561
562         result = ieee80211_wep_init(local);
563         if (result < 0) {
564                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
565                        wiphy_name(local->hw.wiphy), result);
566                 goto fail_wep;
567         }
568
569         rtnl_lock();
570
571         result = ieee80211_init_rate_ctrl_alg(local,
572                                               hw->rate_control_algorithm);
573         if (result < 0) {
574                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
575                        "algorithm\n", wiphy_name(local->hw.wiphy));
576                 goto fail_rate;
577         }
578
579         /* add one default STA interface if supported */
580         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
581                 result = ieee80211_if_add(local, "wlan%d", NULL,
582                                           NL80211_IFTYPE_STATION, NULL);
583                 if (result)
584                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
585                                wiphy_name(local->hw.wiphy));
586         }
587
588         rtnl_unlock();
589
590         ieee80211_led_init(local);
591
592         /* alloc internal scan request */
593         i = 0;
594         local->int_scan_req->ssids = &local->scan_ssid;
595         local->int_scan_req->n_ssids = 1;
596         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
597                 if (!hw->wiphy->bands[band])
598                         continue;
599                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
600                         local->int_scan_req->channels[i] =
601                                 &hw->wiphy->bands[band]->channels[j];
602                         i++;
603                 }
604         }
605         local->int_scan_req->n_channels = i;
606
607         local->network_latency_notifier.notifier_call =
608                 ieee80211_max_network_latency;
609         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
610                                      &local->network_latency_notifier);
611
612         if (result) {
613                 rtnl_lock();
614                 goto fail_pm_qos;
615         }
616
617         return 0;
618
619  fail_pm_qos:
620         ieee80211_led_exit(local);
621         ieee80211_remove_interfaces(local);
622  fail_rate:
623         rtnl_unlock();
624         ieee80211_wep_free(local);
625  fail_wep:
626         sta_info_stop(local);
627  fail_sta_info:
628         destroy_workqueue(local->workqueue);
629  fail_workqueue:
630         wiphy_unregister(local->hw.wiphy);
631  fail_wiphy_register:
632         kfree(local->int_scan_req);
633         return result;
634 }
635 EXPORT_SYMBOL(ieee80211_register_hw);
636
637 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
638 {
639         struct ieee80211_local *local = hw_to_local(hw);
640
641         tasklet_kill(&local->tx_pending_tasklet);
642         tasklet_kill(&local->tasklet);
643
644         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
645                                &local->network_latency_notifier);
646
647         rtnl_lock();
648
649         /*
650          * At this point, interface list manipulations are fine
651          * because the driver cannot be handing us frames any
652          * more and the tasklet is killed.
653          */
654         ieee80211_remove_interfaces(local);
655
656         rtnl_unlock();
657
658         cancel_work_sync(&local->reconfig_filter);
659
660         ieee80211_clear_tx_pending(local);
661         sta_info_stop(local);
662         rate_control_deinitialize(local);
663
664         if (skb_queue_len(&local->skb_queue) ||
665             skb_queue_len(&local->skb_queue_unreliable))
666                 printk(KERN_WARNING "%s: skb_queue not empty\n",
667                        wiphy_name(local->hw.wiphy));
668         skb_queue_purge(&local->skb_queue);
669         skb_queue_purge(&local->skb_queue_unreliable);
670
671         destroy_workqueue(local->workqueue);
672         wiphy_unregister(local->hw.wiphy);
673         ieee80211_wep_free(local);
674         ieee80211_led_exit(local);
675         kfree(local->int_scan_req);
676 }
677 EXPORT_SYMBOL(ieee80211_unregister_hw);
678
679 void ieee80211_free_hw(struct ieee80211_hw *hw)
680 {
681         struct ieee80211_local *local = hw_to_local(hw);
682
683         mutex_destroy(&local->iflist_mtx);
684         mutex_destroy(&local->scan_mtx);
685
686         wiphy_free(local->hw.wiphy);
687 }
688 EXPORT_SYMBOL(ieee80211_free_hw);
689
690 static int __init ieee80211_init(void)
691 {
692         struct sk_buff *skb;
693         int ret;
694
695         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
696         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
697                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
698
699         ret = rc80211_minstrel_init();
700         if (ret)
701                 return ret;
702
703         ret = rc80211_pid_init();
704         if (ret)
705                 goto err_pid;
706
707         ret = ieee80211_iface_init();
708         if (ret)
709                 goto err_netdev;
710
711         return 0;
712  err_netdev:
713         rc80211_pid_exit();
714  err_pid:
715         rc80211_minstrel_exit();
716
717         return ret;
718 }
719
720 static void __exit ieee80211_exit(void)
721 {
722         rc80211_pid_exit();
723         rc80211_minstrel_exit();
724
725         /*
726          * For key todo, it'll be empty by now but the work
727          * might still be scheduled.
728          */
729         flush_scheduled_work();
730
731         if (mesh_allocated)
732                 ieee80211s_stop();
733
734         ieee80211_iface_exit();
735 }
736
737
738 subsys_initcall(ieee80211_init);
739 module_exit(ieee80211_exit);
740
741 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
742 MODULE_LICENSE("GPL");