98320a94c270af8e0772ab2ce311ea988371239d
[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 void ieee80211_configure_filter(struct ieee80211_local *local)
37 {
38         u64 mc;
39         unsigned int changed_flags;
40         unsigned int new_flags = 0;
41
42         if (atomic_read(&local->iff_promiscs))
43                 new_flags |= FIF_PROMISC_IN_BSS;
44
45         if (atomic_read(&local->iff_allmultis))
46                 new_flags |= FIF_ALLMULTI;
47
48         if (local->monitors || local->scanning)
49                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
50
51         if (local->fif_fcsfail)
52                 new_flags |= FIF_FCSFAIL;
53
54         if (local->fif_plcpfail)
55                 new_flags |= FIF_PLCPFAIL;
56
57         if (local->fif_control)
58                 new_flags |= FIF_CONTROL;
59
60         if (local->fif_other_bss)
61                 new_flags |= FIF_OTHER_BSS;
62
63         if (local->fif_pspoll)
64                 new_flags |= FIF_PSPOLL;
65
66         spin_lock_bh(&local->filter_lock);
67         changed_flags = local->filter_flags ^ new_flags;
68
69         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
70         spin_unlock_bh(&local->filter_lock);
71
72         /* be a bit nasty */
73         new_flags |= (1<<31);
74
75         drv_configure_filter(local, changed_flags, &new_flags, mc);
76
77         WARN_ON(new_flags & (1<<31));
78
79         local->filter_flags = new_flags & ~(1<<31);
80 }
81
82 static void ieee80211_reconfig_filter(struct work_struct *work)
83 {
84         struct ieee80211_local *local =
85                 container_of(work, struct ieee80211_local, reconfig_filter);
86
87         ieee80211_configure_filter(local);
88 }
89
90 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
91 {
92         struct ieee80211_channel *chan, *scan_chan;
93         int ret = 0;
94         int power;
95         enum nl80211_channel_type channel_type;
96
97         might_sleep();
98
99         scan_chan = local->scan_channel;
100
101         if (scan_chan) {
102                 chan = scan_chan;
103                 channel_type = NL80211_CHAN_NO_HT;
104         } else {
105                 chan = local->oper_channel;
106                 channel_type = local->oper_channel_type;
107         }
108
109         if (chan != local->hw.conf.channel ||
110             channel_type != local->hw.conf.channel_type) {
111                 local->hw.conf.channel = chan;
112                 local->hw.conf.channel_type = channel_type;
113                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
114         }
115
116         if (scan_chan)
117                 power = chan->max_power;
118         else
119                 power = local->power_constr_level ?
120                         (chan->max_power - local->power_constr_level) :
121                         chan->max_power;
122
123         if (local->user_power_level >= 0)
124                 power = min(power, local->user_power_level);
125
126         if (local->hw.conf.power_level != power) {
127                 changed |= IEEE80211_CONF_CHANGE_POWER;
128                 local->hw.conf.power_level = power;
129         }
130
131         if (changed && local->open_count) {
132                 ret = drv_config(local, changed);
133                 /*
134                  * Goal:
135                  * HW reconfiguration should never fail, the driver has told
136                  * us what it can support so it should live up to that promise.
137                  *
138                  * Current status:
139                  * rfkill is not integrated with mac80211 and a
140                  * configuration command can thus fail if hardware rfkill
141                  * is enabled
142                  *
143                  * FIXME: integrate rfkill with mac80211 and then add this
144                  * WARN_ON() back
145                  *
146                  */
147                 /* WARN_ON(ret); */
148         }
149
150         return ret;
151 }
152
153 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
154                                       u32 changed)
155 {
156         struct ieee80211_local *local = sdata->local;
157         static const u8 zero[ETH_ALEN] = { 0 };
158
159         if (!changed)
160                 return;
161
162         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
163                 /*
164                  * While not associated, claim a BSSID of all-zeroes
165                  * so that drivers don't do any weird things with the
166                  * BSSID at that time.
167                  */
168                 if (sdata->vif.bss_conf.assoc)
169                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
170                 else
171                         sdata->vif.bss_conf.bssid = zero;
172         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
173                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
174         else if (sdata->vif.type == NL80211_IFTYPE_AP)
175                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
176         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
177                 sdata->vif.bss_conf.bssid = zero;
178         } else {
179                 WARN_ON(1);
180                 return;
181         }
182
183         switch (sdata->vif.type) {
184         case NL80211_IFTYPE_AP:
185         case NL80211_IFTYPE_ADHOC:
186         case NL80211_IFTYPE_MESH_POINT:
187                 break;
188         default:
189                 /* do not warn to simplify caller in scan.c */
190                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
191                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
192                         return;
193                 break;
194         }
195
196         if (changed & BSS_CHANGED_BEACON_ENABLED) {
197                 if (local->quiescing || !netif_running(sdata->dev) ||
198                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
199                         sdata->vif.bss_conf.enable_beacon = false;
200                 } else {
201                         /*
202                          * Beacon should be enabled, but AP mode must
203                          * check whether there is a beacon configured.
204                          */
205                         switch (sdata->vif.type) {
206                         case NL80211_IFTYPE_AP:
207                                 sdata->vif.bss_conf.enable_beacon =
208                                         !!rcu_dereference(sdata->u.ap.beacon);
209                                 break;
210                         case NL80211_IFTYPE_ADHOC:
211                                 sdata->vif.bss_conf.enable_beacon =
212                                         !!rcu_dereference(sdata->u.ibss.presp);
213                                 break;
214                         case NL80211_IFTYPE_MESH_POINT:
215                                 sdata->vif.bss_conf.enable_beacon = true;
216                                 break;
217                         default:
218                                 /* not reached */
219                                 WARN_ON(1);
220                                 break;
221                         }
222                 }
223         }
224
225         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
226 }
227
228 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
229 {
230         sdata->vif.bss_conf.use_cts_prot = false;
231         sdata->vif.bss_conf.use_short_preamble = false;
232         sdata->vif.bss_conf.use_short_slot = false;
233         return BSS_CHANGED_ERP_CTS_PROT |
234                BSS_CHANGED_ERP_PREAMBLE |
235                BSS_CHANGED_ERP_SLOT;
236 }
237
238 static void ieee80211_tasklet_handler(unsigned long data)
239 {
240         struct ieee80211_local *local = (struct ieee80211_local *) data;
241         struct sk_buff *skb;
242         struct ieee80211_ra_tid *ra_tid;
243
244         while ((skb = skb_dequeue(&local->skb_queue)) ||
245                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
246                 switch (skb->pkt_type) {
247                 case IEEE80211_RX_MSG:
248                         /* Clear skb->pkt_type in order to not confuse kernel
249                          * netstack. */
250                         skb->pkt_type = 0;
251                         ieee80211_rx(local_to_hw(local), skb);
252                         break;
253                 case IEEE80211_TX_STATUS_MSG:
254                         skb->pkt_type = 0;
255                         ieee80211_tx_status(local_to_hw(local), skb);
256                         break;
257                 case IEEE80211_DELBA_MSG:
258                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
259                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
260                                                 ra_tid->tid);
261                         dev_kfree_skb(skb);
262                         break;
263                 case IEEE80211_ADDBA_MSG:
264                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
265                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
266                                                  ra_tid->tid);
267                         dev_kfree_skb(skb);
268                         break ;
269                 default:
270                         WARN(1, "mac80211: Packet is of unknown type %d\n",
271                              skb->pkt_type);
272                         dev_kfree_skb(skb);
273                         break;
274                 }
275         }
276 }
277
278 static void ieee80211_restart_work(struct work_struct *work)
279 {
280         struct ieee80211_local *local =
281                 container_of(work, struct ieee80211_local, restart_work);
282
283         rtnl_lock();
284         ieee80211_reconfig(local);
285         rtnl_unlock();
286 }
287
288 void ieee80211_restart_hw(struct ieee80211_hw *hw)
289 {
290         struct ieee80211_local *local = hw_to_local(hw);
291
292         /* use this reason, __ieee80211_resume will unblock it */
293         ieee80211_stop_queues_by_reason(hw,
294                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
295
296         schedule_work(&local->restart_work);
297 }
298 EXPORT_SYMBOL(ieee80211_restart_hw);
299
300 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
301                                         const struct ieee80211_ops *ops)
302 {
303         struct ieee80211_local *local;
304         int priv_size, i;
305         struct wiphy *wiphy;
306
307         /* Ensure 32-byte alignment of our private data and hw private data.
308          * We use the wiphy priv data for both our ieee80211_local and for
309          * the driver's private data
310          *
311          * In memory it'll be like this:
312          *
313          * +-------------------------+
314          * | struct wiphy           |
315          * +-------------------------+
316          * | struct ieee80211_local  |
317          * +-------------------------+
318          * | driver's private data   |
319          * +-------------------------+
320          *
321          */
322         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
323
324         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
325
326         if (!wiphy)
327                 return NULL;
328
329         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
330                         WIPHY_FLAG_4ADDR_AP |
331                         WIPHY_FLAG_4ADDR_STATION;
332         wiphy->privid = mac80211_wiphy_privid;
333
334         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
335         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
336                                sizeof(struct cfg80211_bss);
337
338         local = wiphy_priv(wiphy);
339
340         local->hw.wiphy = wiphy;
341
342         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
343
344         BUG_ON(!ops->tx);
345         BUG_ON(!ops->start);
346         BUG_ON(!ops->stop);
347         BUG_ON(!ops->config);
348         BUG_ON(!ops->add_interface);
349         BUG_ON(!ops->remove_interface);
350         BUG_ON(!ops->configure_filter);
351         local->ops = ops;
352
353         /* set up some defaults */
354         local->hw.queues = 1;
355         local->hw.max_rates = 1;
356         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
357         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
358         local->user_power_level = -1;
359
360         INIT_LIST_HEAD(&local->interfaces);
361         mutex_init(&local->iflist_mtx);
362         mutex_init(&local->scan_mtx);
363
364         spin_lock_init(&local->key_lock);
365         spin_lock_init(&local->filter_lock);
366         spin_lock_init(&local->queue_stop_reason_lock);
367
368         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
369
370         INIT_WORK(&local->restart_work, ieee80211_restart_work);
371
372         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
373
374         INIT_WORK(&local->dynamic_ps_enable_work,
375                   ieee80211_dynamic_ps_enable_work);
376         INIT_WORK(&local->dynamic_ps_disable_work,
377                   ieee80211_dynamic_ps_disable_work);
378         setup_timer(&local->dynamic_ps_timer,
379                     ieee80211_dynamic_ps_timer, (unsigned long) local);
380
381         sta_info_init(local);
382
383         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
384                 skb_queue_head_init(&local->pending[i]);
385         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
386                      (unsigned long)local);
387
388         tasklet_init(&local->tasklet,
389                      ieee80211_tasklet_handler,
390                      (unsigned long) local);
391
392         skb_queue_head_init(&local->skb_queue);
393         skb_queue_head_init(&local->skb_queue_unreliable);
394
395         spin_lock_init(&local->ampdu_lock);
396
397         return local_to_hw(local);
398 }
399 EXPORT_SYMBOL(ieee80211_alloc_hw);
400
401 int ieee80211_register_hw(struct ieee80211_hw *hw)
402 {
403         struct ieee80211_local *local = hw_to_local(hw);
404         int result;
405         enum ieee80211_band band;
406         int channels, i, j, max_bitrates;
407         bool supp_ht;
408         static const u32 cipher_suites[] = {
409                 WLAN_CIPHER_SUITE_WEP40,
410                 WLAN_CIPHER_SUITE_WEP104,
411                 WLAN_CIPHER_SUITE_TKIP,
412                 WLAN_CIPHER_SUITE_CCMP,
413
414                 /* keep last -- depends on hw flags! */
415                 WLAN_CIPHER_SUITE_AES_CMAC
416         };
417
418         /*
419          * generic code guarantees at least one band,
420          * set this very early because much code assumes
421          * that hw.conf.channel is assigned
422          */
423         channels = 0;
424         max_bitrates = 0;
425         supp_ht = false;
426         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
427                 struct ieee80211_supported_band *sband;
428
429                 sband = local->hw.wiphy->bands[band];
430                 if (!sband)
431                         continue;
432                 if (!local->oper_channel) {
433                         /* init channel we're on */
434                         local->hw.conf.channel =
435                         local->oper_channel = &sband->channels[0];
436                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
437                 }
438                 channels += sband->n_channels;
439
440                 if (max_bitrates < sband->n_bitrates)
441                         max_bitrates = sband->n_bitrates;
442                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
443         }
444
445         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
446                                       sizeof(void *) * channels, GFP_KERNEL);
447         if (!local->int_scan_req)
448                 return -ENOMEM;
449
450         /* if low-level driver supports AP, we also support VLAN */
451         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
452                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
453
454         /* mac80211 always supports monitor */
455         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
456
457         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
458                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
459         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
460                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
461
462         /*
463          * Calculate scan IE length -- we need this to alloc
464          * memory and to subtract from the driver limit. It
465          * includes the (extended) supported rates and HT
466          * information -- SSID is the driver's responsibility.
467          */
468         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
469         if (supp_ht)
470                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
471
472         if (!local->ops->hw_scan) {
473                 /* For hw_scan, driver needs to set these up. */
474                 local->hw.wiphy->max_scan_ssids = 4;
475                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
476         }
477
478         /*
479          * If the driver supports any scan IEs, then assume the
480          * limit includes the IEs mac80211 will add, otherwise
481          * leave it at zero and let the driver sort it out; we
482          * still pass our IEs to the driver but userspace will
483          * not be allowed to in that case.
484          */
485         if (local->hw.wiphy->max_scan_ie_len)
486                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
487
488         local->hw.wiphy->cipher_suites = cipher_suites;
489         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
490         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
491                 local->hw.wiphy->n_cipher_suites--;
492
493         result = wiphy_register(local->hw.wiphy);
494         if (result < 0)
495                 goto fail_wiphy_register;
496
497         /*
498          * We use the number of queues for feature tests (QoS, HT) internally
499          * so restrict them appropriately.
500          */
501         if (hw->queues > IEEE80211_MAX_QUEUES)
502                 hw->queues = IEEE80211_MAX_QUEUES;
503
504         local->workqueue =
505                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
506         if (!local->workqueue) {
507                 result = -ENOMEM;
508                 goto fail_workqueue;
509         }
510
511         /*
512          * The hardware needs headroom for sending the frame,
513          * and we need some headroom for passing the frame to monitor
514          * interfaces, but never both at the same time.
515          */
516         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
517                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
518
519         debugfs_hw_add(local);
520
521         if (local->hw.max_listen_interval == 0)
522                 local->hw.max_listen_interval = 1;
523
524         local->hw.conf.listen_interval = local->hw.max_listen_interval;
525
526         result = sta_info_start(local);
527         if (result < 0)
528                 goto fail_sta_info;
529
530         result = ieee80211_wep_init(local);
531         if (result < 0) {
532                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
533                        wiphy_name(local->hw.wiphy), result);
534                 goto fail_wep;
535         }
536
537         rtnl_lock();
538
539         result = ieee80211_init_rate_ctrl_alg(local,
540                                               hw->rate_control_algorithm);
541         if (result < 0) {
542                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
543                        "algorithm\n", wiphy_name(local->hw.wiphy));
544                 goto fail_rate;
545         }
546
547         /* add one default STA interface if supported */
548         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
549                 result = ieee80211_if_add(local, "wlan%d", NULL,
550                                           NL80211_IFTYPE_STATION, NULL);
551                 if (result)
552                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
553                                wiphy_name(local->hw.wiphy));
554         }
555
556         rtnl_unlock();
557
558         ieee80211_led_init(local);
559
560         /* alloc internal scan request */
561         i = 0;
562         local->int_scan_req->ssids = &local->scan_ssid;
563         local->int_scan_req->n_ssids = 1;
564         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
565                 if (!hw->wiphy->bands[band])
566                         continue;
567                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
568                         local->int_scan_req->channels[i] =
569                                 &hw->wiphy->bands[band]->channels[j];
570                         i++;
571                 }
572         }
573         local->int_scan_req->n_channels = i;
574
575         local->network_latency_notifier.notifier_call =
576                 ieee80211_max_network_latency;
577         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
578                                      &local->network_latency_notifier);
579
580         if (result) {
581                 rtnl_lock();
582                 goto fail_pm_qos;
583         }
584
585         return 0;
586
587  fail_pm_qos:
588         ieee80211_led_exit(local);
589         ieee80211_remove_interfaces(local);
590  fail_rate:
591         rtnl_unlock();
592         ieee80211_wep_free(local);
593  fail_wep:
594         sta_info_stop(local);
595  fail_sta_info:
596         destroy_workqueue(local->workqueue);
597  fail_workqueue:
598         wiphy_unregister(local->hw.wiphy);
599  fail_wiphy_register:
600         kfree(local->int_scan_req);
601         return result;
602 }
603 EXPORT_SYMBOL(ieee80211_register_hw);
604
605 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
606 {
607         struct ieee80211_local *local = hw_to_local(hw);
608
609         tasklet_kill(&local->tx_pending_tasklet);
610         tasklet_kill(&local->tasklet);
611
612         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
613                                &local->network_latency_notifier);
614
615         rtnl_lock();
616
617         /*
618          * At this point, interface list manipulations are fine
619          * because the driver cannot be handing us frames any
620          * more and the tasklet is killed.
621          */
622         ieee80211_remove_interfaces(local);
623
624         rtnl_unlock();
625
626         cancel_work_sync(&local->reconfig_filter);
627
628         ieee80211_clear_tx_pending(local);
629         sta_info_stop(local);
630         rate_control_deinitialize(local);
631
632         if (skb_queue_len(&local->skb_queue) ||
633             skb_queue_len(&local->skb_queue_unreliable))
634                 printk(KERN_WARNING "%s: skb_queue not empty\n",
635                        wiphy_name(local->hw.wiphy));
636         skb_queue_purge(&local->skb_queue);
637         skb_queue_purge(&local->skb_queue_unreliable);
638
639         destroy_workqueue(local->workqueue);
640         wiphy_unregister(local->hw.wiphy);
641         ieee80211_wep_free(local);
642         ieee80211_led_exit(local);
643         kfree(local->int_scan_req);
644 }
645 EXPORT_SYMBOL(ieee80211_unregister_hw);
646
647 void ieee80211_free_hw(struct ieee80211_hw *hw)
648 {
649         struct ieee80211_local *local = hw_to_local(hw);
650
651         mutex_destroy(&local->iflist_mtx);
652         mutex_destroy(&local->scan_mtx);
653
654         wiphy_free(local->hw.wiphy);
655 }
656 EXPORT_SYMBOL(ieee80211_free_hw);
657
658 static int __init ieee80211_init(void)
659 {
660         struct sk_buff *skb;
661         int ret;
662
663         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
664         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
665                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
666
667         ret = rc80211_minstrel_init();
668         if (ret)
669                 return ret;
670
671         ret = rc80211_pid_init();
672         if (ret)
673                 goto err_pid;
674
675         ret = ieee80211_iface_init();
676         if (ret)
677                 goto err_netdev;
678
679         return 0;
680  err_netdev:
681         rc80211_pid_exit();
682  err_pid:
683         rc80211_minstrel_exit();
684
685         return ret;
686 }
687
688 static void __exit ieee80211_exit(void)
689 {
690         rc80211_pid_exit();
691         rc80211_minstrel_exit();
692
693         /*
694          * For key todo, it'll be empty by now but the work
695          * might still be scheduled.
696          */
697         flush_scheduled_work();
698
699         if (mesh_allocated)
700                 ieee80211s_stop();
701
702         ieee80211_iface_exit();
703 }
704
705
706 subsys_initcall(ieee80211_init);
707 module_exit(ieee80211_exit);
708
709 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
710 MODULE_LICENSE("GPL");