Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos_params.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "led.h"
32 #include "cfg.h"
33 #include "debugfs.h"
34
35
36 bool ieee80211_disable_40mhz_24ghz;
37 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
38 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
39                  "Disable 40MHz support in the 2.4GHz band");
40
41 void ieee80211_configure_filter(struct ieee80211_local *local)
42 {
43         u64 mc;
44         unsigned int changed_flags;
45         unsigned int new_flags = 0;
46
47         if (atomic_read(&local->iff_promiscs))
48                 new_flags |= FIF_PROMISC_IN_BSS;
49
50         if (atomic_read(&local->iff_allmultis))
51                 new_flags |= FIF_ALLMULTI;
52
53         if (local->monitors || local->scanning)
54                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
55
56         if (local->fif_fcsfail)
57                 new_flags |= FIF_FCSFAIL;
58
59         if (local->fif_plcpfail)
60                 new_flags |= FIF_PLCPFAIL;
61
62         if (local->fif_control)
63                 new_flags |= FIF_CONTROL;
64
65         if (local->fif_other_bss)
66                 new_flags |= FIF_OTHER_BSS;
67
68         if (local->fif_pspoll)
69                 new_flags |= FIF_PSPOLL;
70
71         spin_lock_bh(&local->filter_lock);
72         changed_flags = local->filter_flags ^ new_flags;
73
74         mc = drv_prepare_multicast(local, &local->mc_list);
75         spin_unlock_bh(&local->filter_lock);
76
77         /* be a bit nasty */
78         new_flags |= (1<<31);
79
80         drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82         WARN_ON(new_flags & (1<<31));
83
84         local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89         struct ieee80211_local *local =
90                 container_of(work, struct ieee80211_local, reconfig_filter);
91
92         ieee80211_configure_filter(local);
93 }
94
95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
96 {
97         struct ieee80211_channel *chan, *scan_chan;
98         int ret = 0;
99         int power;
100         enum nl80211_channel_type channel_type;
101
102         might_sleep();
103
104         scan_chan = local->scan_channel;
105
106         if (scan_chan) {
107                 chan = scan_chan;
108                 channel_type = NL80211_CHAN_NO_HT;
109         } else if (local->tmp_channel) {
110                 chan = scan_chan = local->tmp_channel;
111                 channel_type = local->tmp_channel_type;
112         } else {
113                 chan = local->oper_channel;
114                 channel_type = local->oper_channel_type;
115         }
116
117         if (chan != local->hw.conf.channel ||
118             channel_type != local->hw.conf.channel_type) {
119                 local->hw.conf.channel = chan;
120                 local->hw.conf.channel_type = channel_type;
121                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
122         }
123
124         if (!conf_is_ht(&local->hw.conf)) {
125                 /*
126                  * mac80211.h documents that this is only valid
127                  * when the channel is set to an HT type, and
128                  * that otherwise STATIC is used.
129                  */
130                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
131         } else if (local->hw.conf.smps_mode != local->smps_mode) {
132                 local->hw.conf.smps_mode = local->smps_mode;
133                 changed |= IEEE80211_CONF_CHANGE_SMPS;
134         }
135
136         if (scan_chan)
137                 power = chan->max_power;
138         else
139                 power = local->power_constr_level ?
140                         (chan->max_power - local->power_constr_level) :
141                         chan->max_power;
142
143         if (local->user_power_level >= 0)
144                 power = min(power, local->user_power_level);
145
146         if (local->hw.conf.power_level != power) {
147                 changed |= IEEE80211_CONF_CHANGE_POWER;
148                 local->hw.conf.power_level = power;
149         }
150
151         if (changed && local->open_count) {
152                 ret = drv_config(local, changed);
153                 /*
154                  * Goal:
155                  * HW reconfiguration should never fail, the driver has told
156                  * us what it can support so it should live up to that promise.
157                  *
158                  * Current status:
159                  * rfkill is not integrated with mac80211 and a
160                  * configuration command can thus fail if hardware rfkill
161                  * is enabled
162                  *
163                  * FIXME: integrate rfkill with mac80211 and then add this
164                  * WARN_ON() back
165                  *
166                  */
167                 /* WARN_ON(ret); */
168         }
169
170         return ret;
171 }
172
173 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
174                                       u32 changed)
175 {
176         struct ieee80211_local *local = sdata->local;
177         static const u8 zero[ETH_ALEN] = { 0 };
178
179         if (!changed)
180                 return;
181
182         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
183                 /*
184                  * While not associated, claim a BSSID of all-zeroes
185                  * so that drivers don't do any weird things with the
186                  * BSSID at that time.
187                  */
188                 if (sdata->vif.bss_conf.assoc)
189                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
190                 else
191                         sdata->vif.bss_conf.bssid = zero;
192         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
193                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
194         else if (sdata->vif.type == NL80211_IFTYPE_AP)
195                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
196         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
197                 sdata->vif.bss_conf.bssid = zero;
198         } else {
199                 WARN_ON(1);
200                 return;
201         }
202
203         switch (sdata->vif.type) {
204         case NL80211_IFTYPE_AP:
205         case NL80211_IFTYPE_ADHOC:
206         case NL80211_IFTYPE_MESH_POINT:
207                 break;
208         default:
209                 /* do not warn to simplify caller in scan.c */
210                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
211                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
212                         return;
213                 break;
214         }
215
216         if (changed & BSS_CHANGED_BEACON_ENABLED) {
217                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
218                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
219                         sdata->vif.bss_conf.enable_beacon = false;
220                 } else {
221                         /*
222                          * Beacon should be enabled, but AP mode must
223                          * check whether there is a beacon configured.
224                          */
225                         switch (sdata->vif.type) {
226                         case NL80211_IFTYPE_AP:
227                                 sdata->vif.bss_conf.enable_beacon =
228                                         !!sdata->u.ap.beacon;
229                                 break;
230                         case NL80211_IFTYPE_ADHOC:
231                                 sdata->vif.bss_conf.enable_beacon =
232                                         !!sdata->u.ibss.presp;
233                                 break;
234                         case NL80211_IFTYPE_MESH_POINT:
235                                 sdata->vif.bss_conf.enable_beacon = true;
236                                 break;
237                         default:
238                                 /* not reached */
239                                 WARN_ON(1);
240                                 break;
241                         }
242                 }
243         }
244
245         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
246 }
247
248 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
249 {
250         sdata->vif.bss_conf.use_cts_prot = false;
251         sdata->vif.bss_conf.use_short_preamble = false;
252         sdata->vif.bss_conf.use_short_slot = false;
253         return BSS_CHANGED_ERP_CTS_PROT |
254                BSS_CHANGED_ERP_PREAMBLE |
255                BSS_CHANGED_ERP_SLOT;
256 }
257
258 static void ieee80211_tasklet_handler(unsigned long data)
259 {
260         struct ieee80211_local *local = (struct ieee80211_local *) data;
261         struct sk_buff *skb;
262         struct ieee80211_ra_tid *ra_tid;
263
264         while ((skb = skb_dequeue(&local->skb_queue)) ||
265                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
266                 switch (skb->pkt_type) {
267                 case IEEE80211_RX_MSG:
268                         /* Clear skb->pkt_type in order to not confuse kernel
269                          * netstack. */
270                         skb->pkt_type = 0;
271                         ieee80211_rx(local_to_hw(local), skb);
272                         break;
273                 case IEEE80211_TX_STATUS_MSG:
274                         skb->pkt_type = 0;
275                         ieee80211_tx_status(local_to_hw(local), skb);
276                         break;
277                 case IEEE80211_DELBA_MSG:
278                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
279                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
280                                                 ra_tid->tid);
281                         dev_kfree_skb(skb);
282                         break;
283                 case IEEE80211_ADDBA_MSG:
284                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
285                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
286                                                  ra_tid->tid);
287                         dev_kfree_skb(skb);
288                         break ;
289                 default:
290                         WARN(1, "mac80211: Packet is of unknown type %d\n",
291                              skb->pkt_type);
292                         dev_kfree_skb(skb);
293                         break;
294                 }
295         }
296 }
297
298 static void ieee80211_restart_work(struct work_struct *work)
299 {
300         struct ieee80211_local *local =
301                 container_of(work, struct ieee80211_local, restart_work);
302
303         rtnl_lock();
304         ieee80211_reconfig(local);
305         rtnl_unlock();
306 }
307
308 void ieee80211_restart_hw(struct ieee80211_hw *hw)
309 {
310         struct ieee80211_local *local = hw_to_local(hw);
311
312         trace_api_restart_hw(local);
313
314         /* use this reason, __ieee80211_resume will unblock it */
315         ieee80211_stop_queues_by_reason(hw,
316                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
317
318         schedule_work(&local->restart_work);
319 }
320 EXPORT_SYMBOL(ieee80211_restart_hw);
321
322 static void ieee80211_recalc_smps_work(struct work_struct *work)
323 {
324         struct ieee80211_local *local =
325                 container_of(work, struct ieee80211_local, recalc_smps);
326
327         mutex_lock(&local->iflist_mtx);
328         ieee80211_recalc_smps(local, NULL);
329         mutex_unlock(&local->iflist_mtx);
330 }
331
332 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
333                                         const struct ieee80211_ops *ops)
334 {
335         struct ieee80211_local *local;
336         int priv_size, i;
337         struct wiphy *wiphy;
338
339         /* Ensure 32-byte alignment of our private data and hw private data.
340          * We use the wiphy priv data for both our ieee80211_local and for
341          * the driver's private data
342          *
343          * In memory it'll be like this:
344          *
345          * +-------------------------+
346          * | struct wiphy           |
347          * +-------------------------+
348          * | struct ieee80211_local  |
349          * +-------------------------+
350          * | driver's private data   |
351          * +-------------------------+
352          *
353          */
354         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
355
356         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
357
358         if (!wiphy)
359                 return NULL;
360
361         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
362                         WIPHY_FLAG_4ADDR_AP |
363                         WIPHY_FLAG_4ADDR_STATION;
364         wiphy->privid = mac80211_wiphy_privid;
365
366         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
367
368         local = wiphy_priv(wiphy);
369
370         local->hw.wiphy = wiphy;
371
372         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
373
374         BUG_ON(!ops->tx);
375         BUG_ON(!ops->start);
376         BUG_ON(!ops->stop);
377         BUG_ON(!ops->config);
378         BUG_ON(!ops->add_interface);
379         BUG_ON(!ops->remove_interface);
380         BUG_ON(!ops->configure_filter);
381         local->ops = ops;
382
383         /* set up some defaults */
384         local->hw.queues = 1;
385         local->hw.max_rates = 1;
386         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
387         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
388         local->user_power_level = -1;
389         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
390         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
391
392         INIT_LIST_HEAD(&local->interfaces);
393
394         __hw_addr_init(&local->mc_list);
395
396         mutex_init(&local->iflist_mtx);
397         mutex_init(&local->scan_mtx);
398
399         spin_lock_init(&local->key_lock);
400         spin_lock_init(&local->filter_lock);
401         spin_lock_init(&local->queue_stop_reason_lock);
402
403         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
404
405         ieee80211_work_init(local);
406
407         INIT_WORK(&local->restart_work, ieee80211_restart_work);
408
409         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
410         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
411         local->smps_mode = IEEE80211_SMPS_OFF;
412
413         INIT_WORK(&local->dynamic_ps_enable_work,
414                   ieee80211_dynamic_ps_enable_work);
415         INIT_WORK(&local->dynamic_ps_disable_work,
416                   ieee80211_dynamic_ps_disable_work);
417         setup_timer(&local->dynamic_ps_timer,
418                     ieee80211_dynamic_ps_timer, (unsigned long) local);
419
420         sta_info_init(local);
421
422         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
423                 skb_queue_head_init(&local->pending[i]);
424         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
425                      (unsigned long)local);
426
427         tasklet_init(&local->tasklet,
428                      ieee80211_tasklet_handler,
429                      (unsigned long) local);
430
431         skb_queue_head_init(&local->skb_queue);
432         skb_queue_head_init(&local->skb_queue_unreliable);
433
434         spin_lock_init(&local->ampdu_lock);
435
436         return local_to_hw(local);
437 }
438 EXPORT_SYMBOL(ieee80211_alloc_hw);
439
440 int ieee80211_register_hw(struct ieee80211_hw *hw)
441 {
442         struct ieee80211_local *local = hw_to_local(hw);
443         int result;
444         enum ieee80211_band band;
445         int channels, max_bitrates;
446         bool supp_ht;
447         static const u32 cipher_suites[] = {
448                 WLAN_CIPHER_SUITE_WEP40,
449                 WLAN_CIPHER_SUITE_WEP104,
450                 WLAN_CIPHER_SUITE_TKIP,
451                 WLAN_CIPHER_SUITE_CCMP,
452
453                 /* keep last -- depends on hw flags! */
454                 WLAN_CIPHER_SUITE_AES_CMAC
455         };
456
457         /*
458          * generic code guarantees at least one band,
459          * set this very early because much code assumes
460          * that hw.conf.channel is assigned
461          */
462         channels = 0;
463         max_bitrates = 0;
464         supp_ht = false;
465         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
466                 struct ieee80211_supported_band *sband;
467
468                 sband = local->hw.wiphy->bands[band];
469                 if (!sband)
470                         continue;
471                 if (!local->oper_channel) {
472                         /* init channel we're on */
473                         local->hw.conf.channel =
474                         local->oper_channel = &sband->channels[0];
475                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
476                 }
477                 channels += sband->n_channels;
478
479                 if (max_bitrates < sband->n_bitrates)
480                         max_bitrates = sband->n_bitrates;
481                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
482         }
483
484         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
485                                       sizeof(void *) * channels, GFP_KERNEL);
486         if (!local->int_scan_req)
487                 return -ENOMEM;
488
489         /* if low-level driver supports AP, we also support VLAN */
490         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
491                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
492
493         /* mac80211 always supports monitor */
494         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
495
496         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
497                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
498         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
499                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
500
501         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
502              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
503              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
504
505         /*
506          * Calculate scan IE length -- we need this to alloc
507          * memory and to subtract from the driver limit. It
508          * includes the (extended) supported rates and HT
509          * information -- SSID is the driver's responsibility.
510          */
511         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
512         if (supp_ht)
513                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
514
515         if (!local->ops->hw_scan) {
516                 /* For hw_scan, driver needs to set these up. */
517                 local->hw.wiphy->max_scan_ssids = 4;
518                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
519         }
520
521         /*
522          * If the driver supports any scan IEs, then assume the
523          * limit includes the IEs mac80211 will add, otherwise
524          * leave it at zero and let the driver sort it out; we
525          * still pass our IEs to the driver but userspace will
526          * not be allowed to in that case.
527          */
528         if (local->hw.wiphy->max_scan_ie_len)
529                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
530
531         local->hw.wiphy->cipher_suites = cipher_suites;
532         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
533         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
534                 local->hw.wiphy->n_cipher_suites--;
535
536         result = wiphy_register(local->hw.wiphy);
537         if (result < 0)
538                 goto fail_wiphy_register;
539
540         /*
541          * We use the number of queues for feature tests (QoS, HT) internally
542          * so restrict them appropriately.
543          */
544         if (hw->queues > IEEE80211_MAX_QUEUES)
545                 hw->queues = IEEE80211_MAX_QUEUES;
546
547         local->workqueue =
548                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
549         if (!local->workqueue) {
550                 result = -ENOMEM;
551                 goto fail_workqueue;
552         }
553
554         /*
555          * The hardware needs headroom for sending the frame,
556          * and we need some headroom for passing the frame to monitor
557          * interfaces, but never both at the same time.
558          */
559         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
560                         sizeof(struct ieee80211_tx_status_rtap_hdr));
561         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
562                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
563
564         debugfs_hw_add(local);
565
566         /*
567          * if the driver doesn't specify a max listen interval we
568          * use 5 which should be a safe default
569          */
570         if (local->hw.max_listen_interval == 0)
571                 local->hw.max_listen_interval = 5;
572
573         local->hw.conf.listen_interval = local->hw.max_listen_interval;
574
575         local->hw.conf.dynamic_ps_forced_timeout = -1;
576
577         result = sta_info_start(local);
578         if (result < 0)
579                 goto fail_sta_info;
580
581         result = ieee80211_wep_init(local);
582         if (result < 0) {
583                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
584                        wiphy_name(local->hw.wiphy), result);
585                 goto fail_wep;
586         }
587
588         rtnl_lock();
589
590         result = ieee80211_init_rate_ctrl_alg(local,
591                                               hw->rate_control_algorithm);
592         if (result < 0) {
593                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
594                        "algorithm\n", wiphy_name(local->hw.wiphy));
595                 goto fail_rate;
596         }
597
598         /* add one default STA interface if supported */
599         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
600                 result = ieee80211_if_add(local, "wlan%d", NULL,
601                                           NL80211_IFTYPE_STATION, NULL);
602                 if (result)
603                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
604                                wiphy_name(local->hw.wiphy));
605         }
606
607         rtnl_unlock();
608
609         ieee80211_led_init(local);
610
611         local->network_latency_notifier.notifier_call =
612                 ieee80211_max_network_latency;
613         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
614                                      &local->network_latency_notifier);
615
616         if (result) {
617                 rtnl_lock();
618                 goto fail_pm_qos;
619         }
620
621         return 0;
622
623  fail_pm_qos:
624         ieee80211_led_exit(local);
625         ieee80211_remove_interfaces(local);
626  fail_rate:
627         rtnl_unlock();
628         ieee80211_wep_free(local);
629  fail_wep:
630         sta_info_stop(local);
631  fail_sta_info:
632         destroy_workqueue(local->workqueue);
633  fail_workqueue:
634         wiphy_unregister(local->hw.wiphy);
635  fail_wiphy_register:
636         kfree(local->int_scan_req);
637         return result;
638 }
639 EXPORT_SYMBOL(ieee80211_register_hw);
640
641 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
642 {
643         struct ieee80211_local *local = hw_to_local(hw);
644
645         tasklet_kill(&local->tx_pending_tasklet);
646         tasklet_kill(&local->tasklet);
647
648         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
649                                &local->network_latency_notifier);
650
651         rtnl_lock();
652
653         /*
654          * At this point, interface list manipulations are fine
655          * because the driver cannot be handing us frames any
656          * more and the tasklet is killed.
657          */
658         ieee80211_remove_interfaces(local);
659
660         rtnl_unlock();
661
662         cancel_work_sync(&local->reconfig_filter);
663
664         ieee80211_clear_tx_pending(local);
665         sta_info_stop(local);
666         rate_control_deinitialize(local);
667
668         if (skb_queue_len(&local->skb_queue) ||
669             skb_queue_len(&local->skb_queue_unreliable))
670                 printk(KERN_WARNING "%s: skb_queue not empty\n",
671                        wiphy_name(local->hw.wiphy));
672         skb_queue_purge(&local->skb_queue);
673         skb_queue_purge(&local->skb_queue_unreliable);
674
675         destroy_workqueue(local->workqueue);
676         wiphy_unregister(local->hw.wiphy);
677         ieee80211_wep_free(local);
678         ieee80211_led_exit(local);
679         kfree(local->int_scan_req);
680 }
681 EXPORT_SYMBOL(ieee80211_unregister_hw);
682
683 void ieee80211_free_hw(struct ieee80211_hw *hw)
684 {
685         struct ieee80211_local *local = hw_to_local(hw);
686
687         mutex_destroy(&local->iflist_mtx);
688         mutex_destroy(&local->scan_mtx);
689
690         wiphy_free(local->hw.wiphy);
691 }
692 EXPORT_SYMBOL(ieee80211_free_hw);
693
694 static int __init ieee80211_init(void)
695 {
696         struct sk_buff *skb;
697         int ret;
698
699         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
700         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
701                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
702
703         ret = rc80211_minstrel_init();
704         if (ret)
705                 return ret;
706
707         ret = rc80211_pid_init();
708         if (ret)
709                 goto err_pid;
710
711         ret = ieee80211_iface_init();
712         if (ret)
713                 goto err_netdev;
714
715         return 0;
716  err_netdev:
717         rc80211_pid_exit();
718  err_pid:
719         rc80211_minstrel_exit();
720
721         return ret;
722 }
723
724 static void __exit ieee80211_exit(void)
725 {
726         rc80211_pid_exit();
727         rc80211_minstrel_exit();
728
729         /*
730          * For key todo, it'll be empty by now but the work
731          * might still be scheduled.
732          */
733         flush_scheduled_work();
734
735         if (mesh_allocated)
736                 ieee80211s_stop();
737
738         ieee80211_iface_exit();
739 }
740
741
742 subsys_initcall(ieee80211_init);
743 module_exit(ieee80211_exit);
744
745 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
746 MODULE_LICENSE("GPL");