mac80211: inform drivers about the off-channel status on channel changes
[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 <linux/inetdevice.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_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                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
111         } else if (local->tmp_channel) {
112                 chan = scan_chan = local->tmp_channel;
113                 channel_type = local->tmp_channel_type;
114                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
115         } else {
116                 chan = local->oper_channel;
117                 channel_type = local->_oper_channel_type;
118                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
119         }
120
121         if (chan != local->hw.conf.channel ||
122             channel_type != local->hw.conf.channel_type) {
123                 local->hw.conf.channel = chan;
124                 local->hw.conf.channel_type = channel_type;
125                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
126         }
127
128         if (!conf_is_ht(&local->hw.conf)) {
129                 /*
130                  * mac80211.h documents that this is only valid
131                  * when the channel is set to an HT type, and
132                  * that otherwise STATIC is used.
133                  */
134                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
135         } else if (local->hw.conf.smps_mode != local->smps_mode) {
136                 local->hw.conf.smps_mode = local->smps_mode;
137                 changed |= IEEE80211_CONF_CHANGE_SMPS;
138         }
139
140         if (scan_chan)
141                 power = chan->max_power;
142         else
143                 power = local->power_constr_level ?
144                         (chan->max_power - local->power_constr_level) :
145                         chan->max_power;
146
147         if (local->user_power_level >= 0)
148                 power = min(power, local->user_power_level);
149
150         if (local->hw.conf.power_level != power) {
151                 changed |= IEEE80211_CONF_CHANGE_POWER;
152                 local->hw.conf.power_level = power;
153         }
154
155         if (changed && local->open_count) {
156                 ret = drv_config(local, changed);
157                 /*
158                  * Goal:
159                  * HW reconfiguration should never fail, the driver has told
160                  * us what it can support so it should live up to that promise.
161                  *
162                  * Current status:
163                  * rfkill is not integrated with mac80211 and a
164                  * configuration command can thus fail if hardware rfkill
165                  * is enabled
166                  *
167                  * FIXME: integrate rfkill with mac80211 and then add this
168                  * WARN_ON() back
169                  *
170                  */
171                 /* WARN_ON(ret); */
172         }
173
174         return ret;
175 }
176
177 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
178                                       u32 changed)
179 {
180         struct ieee80211_local *local = sdata->local;
181         static const u8 zero[ETH_ALEN] = { 0 };
182
183         if (!changed)
184                 return;
185
186         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
187                 /*
188                  * While not associated, claim a BSSID of all-zeroes
189                  * so that drivers don't do any weird things with the
190                  * BSSID at that time.
191                  */
192                 if (sdata->vif.bss_conf.assoc)
193                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
194                 else
195                         sdata->vif.bss_conf.bssid = zero;
196         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
197                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
198         else if (sdata->vif.type == NL80211_IFTYPE_AP)
199                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
200         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
201                 sdata->vif.bss_conf.bssid = zero;
202         } else {
203                 WARN_ON(1);
204                 return;
205         }
206
207         switch (sdata->vif.type) {
208         case NL80211_IFTYPE_AP:
209         case NL80211_IFTYPE_ADHOC:
210         case NL80211_IFTYPE_MESH_POINT:
211                 break;
212         default:
213                 /* do not warn to simplify caller in scan.c */
214                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
215                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
216                         return;
217                 break;
218         }
219
220         if (changed & BSS_CHANGED_BEACON_ENABLED) {
221                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
222                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
223                         sdata->vif.bss_conf.enable_beacon = false;
224                 } else {
225                         /*
226                          * Beacon should be enabled, but AP mode must
227                          * check whether there is a beacon configured.
228                          */
229                         switch (sdata->vif.type) {
230                         case NL80211_IFTYPE_AP:
231                                 sdata->vif.bss_conf.enable_beacon =
232                                         !!sdata->u.ap.beacon;
233                                 break;
234                         case NL80211_IFTYPE_ADHOC:
235                                 sdata->vif.bss_conf.enable_beacon =
236                                         !!sdata->u.ibss.presp;
237                                 break;
238                         case NL80211_IFTYPE_MESH_POINT:
239                                 sdata->vif.bss_conf.enable_beacon = true;
240                                 break;
241                         default:
242                                 /* not reached */
243                                 WARN_ON(1);
244                                 break;
245                         }
246                 }
247         }
248
249         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
250 }
251
252 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
253 {
254         sdata->vif.bss_conf.use_cts_prot = false;
255         sdata->vif.bss_conf.use_short_preamble = false;
256         sdata->vif.bss_conf.use_short_slot = false;
257         return BSS_CHANGED_ERP_CTS_PROT |
258                BSS_CHANGED_ERP_PREAMBLE |
259                BSS_CHANGED_ERP_SLOT;
260 }
261
262 static void ieee80211_tasklet_handler(unsigned long data)
263 {
264         struct ieee80211_local *local = (struct ieee80211_local *) data;
265         struct sk_buff *skb;
266
267         while ((skb = skb_dequeue(&local->skb_queue)) ||
268                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
269                 switch (skb->pkt_type) {
270                 case IEEE80211_RX_MSG:
271                         /* Clear skb->pkt_type in order to not confuse kernel
272                          * netstack. */
273                         skb->pkt_type = 0;
274                         ieee80211_rx(local_to_hw(local), skb);
275                         break;
276                 case IEEE80211_TX_STATUS_MSG:
277                         skb->pkt_type = 0;
278                         ieee80211_tx_status(local_to_hw(local), skb);
279                         break;
280                 default:
281                         WARN(1, "mac80211: Packet is of unknown type %d\n",
282                              skb->pkt_type);
283                         dev_kfree_skb(skb);
284                         break;
285                 }
286         }
287 }
288
289 static void ieee80211_restart_work(struct work_struct *work)
290 {
291         struct ieee80211_local *local =
292                 container_of(work, struct ieee80211_local, restart_work);
293
294         rtnl_lock();
295         ieee80211_reconfig(local);
296         rtnl_unlock();
297 }
298
299 void ieee80211_restart_hw(struct ieee80211_hw *hw)
300 {
301         struct ieee80211_local *local = hw_to_local(hw);
302
303         trace_api_restart_hw(local);
304
305         /* use this reason, __ieee80211_resume will unblock it */
306         ieee80211_stop_queues_by_reason(hw,
307                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
308
309         schedule_work(&local->restart_work);
310 }
311 EXPORT_SYMBOL(ieee80211_restart_hw);
312
313 static void ieee80211_recalc_smps_work(struct work_struct *work)
314 {
315         struct ieee80211_local *local =
316                 container_of(work, struct ieee80211_local, recalc_smps);
317
318         mutex_lock(&local->iflist_mtx);
319         ieee80211_recalc_smps(local, NULL);
320         mutex_unlock(&local->iflist_mtx);
321 }
322
323 #ifdef CONFIG_INET
324 static int ieee80211_ifa_changed(struct notifier_block *nb,
325                                  unsigned long data, void *arg)
326 {
327         struct in_ifaddr *ifa = arg;
328         struct ieee80211_local *local =
329                 container_of(nb, struct ieee80211_local,
330                              ifa_notifier);
331         struct net_device *ndev = ifa->ifa_dev->dev;
332         struct wireless_dev *wdev = ndev->ieee80211_ptr;
333         struct in_device *idev;
334         struct ieee80211_sub_if_data *sdata;
335         struct ieee80211_bss_conf *bss_conf;
336         struct ieee80211_if_managed *ifmgd;
337         int c = 0;
338
339         if (!netif_running(ndev))
340                 return NOTIFY_DONE;
341
342         /* Make sure it's our interface that got changed */
343         if (!wdev)
344                 return NOTIFY_DONE;
345
346         if (wdev->wiphy != local->hw.wiphy)
347                 return NOTIFY_DONE;
348
349         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
350         bss_conf = &sdata->vif.bss_conf;
351
352         /* ARP filtering is only supported in managed mode */
353         if (sdata->vif.type != NL80211_IFTYPE_STATION)
354                 return NOTIFY_DONE;
355
356         idev = sdata->dev->ip_ptr;
357         if (!idev)
358                 return NOTIFY_DONE;
359
360         ifmgd = &sdata->u.mgd;
361         mutex_lock(&ifmgd->mtx);
362
363         /* Copy the addresses to the bss_conf list */
364         ifa = idev->ifa_list;
365         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
366                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
367                 ifa = ifa->ifa_next;
368                 c++;
369         }
370
371         /* If not all addresses fit the list, disable filtering */
372         if (ifa) {
373                 sdata->arp_filter_state = false;
374                 c = 0;
375         } else {
376                 sdata->arp_filter_state = true;
377         }
378         bss_conf->arp_addr_cnt = c;
379
380         /* Configure driver only if associated */
381         if (ifmgd->associated) {
382                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
383                 ieee80211_bss_info_change_notify(sdata,
384                                                  BSS_CHANGED_ARP_FILTER);
385         }
386
387         mutex_unlock(&ifmgd->mtx);
388
389         return NOTIFY_DONE;
390 }
391 #endif
392
393 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
394                                         const struct ieee80211_ops *ops)
395 {
396         struct ieee80211_local *local;
397         int priv_size, i;
398         struct wiphy *wiphy;
399
400         /* Ensure 32-byte alignment of our private data and hw private data.
401          * We use the wiphy priv data for both our ieee80211_local and for
402          * the driver's private data
403          *
404          * In memory it'll be like this:
405          *
406          * +-------------------------+
407          * | struct wiphy           |
408          * +-------------------------+
409          * | struct ieee80211_local  |
410          * +-------------------------+
411          * | driver's private data   |
412          * +-------------------------+
413          *
414          */
415         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
416
417         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
418
419         if (!wiphy)
420                 return NULL;
421
422         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
423                         WIPHY_FLAG_4ADDR_AP |
424                         WIPHY_FLAG_4ADDR_STATION;
425         wiphy->privid = mac80211_wiphy_privid;
426
427         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
428
429         local = wiphy_priv(wiphy);
430
431         local->hw.wiphy = wiphy;
432
433         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
434
435         BUG_ON(!ops->tx);
436         BUG_ON(!ops->start);
437         BUG_ON(!ops->stop);
438         BUG_ON(!ops->config);
439         BUG_ON(!ops->add_interface);
440         BUG_ON(!ops->remove_interface);
441         BUG_ON(!ops->configure_filter);
442         local->ops = ops;
443
444         /* set up some defaults */
445         local->hw.queues = 1;
446         local->hw.max_rates = 1;
447         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
448         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
449         local->user_power_level = -1;
450         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
451         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
452
453         INIT_LIST_HEAD(&local->interfaces);
454
455         __hw_addr_init(&local->mc_list);
456
457         mutex_init(&local->iflist_mtx);
458         mutex_init(&local->scan_mtx);
459
460         mutex_init(&local->key_mtx);
461         spin_lock_init(&local->filter_lock);
462         spin_lock_init(&local->queue_stop_reason_lock);
463
464         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
465
466         ieee80211_work_init(local);
467
468         INIT_WORK(&local->restart_work, ieee80211_restart_work);
469
470         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
471         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
472         local->smps_mode = IEEE80211_SMPS_OFF;
473
474         INIT_WORK(&local->dynamic_ps_enable_work,
475                   ieee80211_dynamic_ps_enable_work);
476         INIT_WORK(&local->dynamic_ps_disable_work,
477                   ieee80211_dynamic_ps_disable_work);
478         setup_timer(&local->dynamic_ps_timer,
479                     ieee80211_dynamic_ps_timer, (unsigned long) local);
480
481         sta_info_init(local);
482
483         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
484                 skb_queue_head_init(&local->pending[i]);
485                 atomic_set(&local->agg_queue_stop[i], 0);
486         }
487         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
488                      (unsigned long)local);
489
490         tasklet_init(&local->tasklet,
491                      ieee80211_tasklet_handler,
492                      (unsigned long) local);
493
494         skb_queue_head_init(&local->skb_queue);
495         skb_queue_head_init(&local->skb_queue_unreliable);
496
497         return local_to_hw(local);
498 }
499 EXPORT_SYMBOL(ieee80211_alloc_hw);
500
501 int ieee80211_register_hw(struct ieee80211_hw *hw)
502 {
503         struct ieee80211_local *local = hw_to_local(hw);
504         int result;
505         enum ieee80211_band band;
506         int channels, max_bitrates;
507         bool supp_ht;
508         static const u32 cipher_suites[] = {
509                 WLAN_CIPHER_SUITE_WEP40,
510                 WLAN_CIPHER_SUITE_WEP104,
511                 WLAN_CIPHER_SUITE_TKIP,
512                 WLAN_CIPHER_SUITE_CCMP,
513
514                 /* keep last -- depends on hw flags! */
515                 WLAN_CIPHER_SUITE_AES_CMAC
516         };
517
518         /*
519          * generic code guarantees at least one band,
520          * set this very early because much code assumes
521          * that hw.conf.channel is assigned
522          */
523         channels = 0;
524         max_bitrates = 0;
525         supp_ht = false;
526         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
527                 struct ieee80211_supported_band *sband;
528
529                 sband = local->hw.wiphy->bands[band];
530                 if (!sband)
531                         continue;
532                 if (!local->oper_channel) {
533                         /* init channel we're on */
534                         local->hw.conf.channel =
535                         local->oper_channel = &sband->channels[0];
536                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
537                 }
538                 channels += sband->n_channels;
539
540                 if (max_bitrates < sband->n_bitrates)
541                         max_bitrates = sband->n_bitrates;
542                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
543         }
544
545         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
546                                       sizeof(void *) * channels, GFP_KERNEL);
547         if (!local->int_scan_req)
548                 return -ENOMEM;
549
550         /* if low-level driver supports AP, we also support VLAN */
551         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
552                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
553
554         /* mac80211 always supports monitor */
555         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
556
557         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
558                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
559         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
560                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
561
562         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
563              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
564              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
565
566         /*
567          * Calculate scan IE length -- we need this to alloc
568          * memory and to subtract from the driver limit. It
569          * includes the (extended) supported rates and HT
570          * information -- SSID is the driver's responsibility.
571          */
572         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
573         if (supp_ht)
574                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
575
576         if (!local->ops->hw_scan) {
577                 /* For hw_scan, driver needs to set these up. */
578                 local->hw.wiphy->max_scan_ssids = 4;
579                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
580         }
581
582         /*
583          * If the driver supports any scan IEs, then assume the
584          * limit includes the IEs mac80211 will add, otherwise
585          * leave it at zero and let the driver sort it out; we
586          * still pass our IEs to the driver but userspace will
587          * not be allowed to in that case.
588          */
589         if (local->hw.wiphy->max_scan_ie_len)
590                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
591
592         local->hw.wiphy->cipher_suites = cipher_suites;
593         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
594         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
595                 local->hw.wiphy->n_cipher_suites--;
596
597         result = wiphy_register(local->hw.wiphy);
598         if (result < 0)
599                 goto fail_wiphy_register;
600
601         /*
602          * We use the number of queues for feature tests (QoS, HT) internally
603          * so restrict them appropriately.
604          */
605         if (hw->queues > IEEE80211_MAX_QUEUES)
606                 hw->queues = IEEE80211_MAX_QUEUES;
607
608         local->workqueue =
609                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
610         if (!local->workqueue) {
611                 result = -ENOMEM;
612                 goto fail_workqueue;
613         }
614
615         /*
616          * The hardware needs headroom for sending the frame,
617          * and we need some headroom for passing the frame to monitor
618          * interfaces, but never both at the same time.
619          */
620         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
621                         sizeof(struct ieee80211_tx_status_rtap_hdr));
622         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
623                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
624
625         debugfs_hw_add(local);
626
627         /*
628          * if the driver doesn't specify a max listen interval we
629          * use 5 which should be a safe default
630          */
631         if (local->hw.max_listen_interval == 0)
632                 local->hw.max_listen_interval = 5;
633
634         local->hw.conf.listen_interval = local->hw.max_listen_interval;
635
636         local->dynamic_ps_forced_timeout = -1;
637
638         result = sta_info_start(local);
639         if (result < 0)
640                 goto fail_sta_info;
641
642         result = ieee80211_wep_init(local);
643         if (result < 0)
644                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
645                        wiphy_name(local->hw.wiphy), result);
646
647         rtnl_lock();
648
649         result = ieee80211_init_rate_ctrl_alg(local,
650                                               hw->rate_control_algorithm);
651         if (result < 0) {
652                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
653                        "algorithm\n", wiphy_name(local->hw.wiphy));
654                 goto fail_rate;
655         }
656
657         /* add one default STA interface if supported */
658         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
659                 result = ieee80211_if_add(local, "wlan%d", NULL,
660                                           NL80211_IFTYPE_STATION, NULL);
661                 if (result)
662                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
663                                wiphy_name(local->hw.wiphy));
664         }
665
666         rtnl_unlock();
667
668         ieee80211_led_init(local);
669
670         local->network_latency_notifier.notifier_call =
671                 ieee80211_max_network_latency;
672         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
673                                      &local->network_latency_notifier);
674         if (result) {
675                 rtnl_lock();
676                 goto fail_pm_qos;
677         }
678
679 #ifdef CONFIG_INET
680         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
681         result = register_inetaddr_notifier(&local->ifa_notifier);
682         if (result)
683                 goto fail_ifa;
684 #endif
685
686         return 0;
687
688  fail_ifa:
689         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
690                                &local->network_latency_notifier);
691         rtnl_lock();
692  fail_pm_qos:
693         ieee80211_led_exit(local);
694         ieee80211_remove_interfaces(local);
695  fail_rate:
696         rtnl_unlock();
697         ieee80211_wep_free(local);
698         sta_info_stop(local);
699  fail_sta_info:
700         destroy_workqueue(local->workqueue);
701  fail_workqueue:
702         wiphy_unregister(local->hw.wiphy);
703  fail_wiphy_register:
704         kfree(local->int_scan_req);
705         return result;
706 }
707 EXPORT_SYMBOL(ieee80211_register_hw);
708
709 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
710 {
711         struct ieee80211_local *local = hw_to_local(hw);
712
713         tasklet_kill(&local->tx_pending_tasklet);
714         tasklet_kill(&local->tasklet);
715
716         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
717                                &local->network_latency_notifier);
718 #ifdef CONFIG_INET
719         unregister_inetaddr_notifier(&local->ifa_notifier);
720 #endif
721
722         rtnl_lock();
723
724         /*
725          * At this point, interface list manipulations are fine
726          * because the driver cannot be handing us frames any
727          * more and the tasklet is killed.
728          */
729         ieee80211_remove_interfaces(local);
730
731         rtnl_unlock();
732
733         cancel_work_sync(&local->reconfig_filter);
734
735         ieee80211_clear_tx_pending(local);
736         sta_info_stop(local);
737         rate_control_deinitialize(local);
738
739         if (skb_queue_len(&local->skb_queue) ||
740             skb_queue_len(&local->skb_queue_unreliable))
741                 printk(KERN_WARNING "%s: skb_queue not empty\n",
742                        wiphy_name(local->hw.wiphy));
743         skb_queue_purge(&local->skb_queue);
744         skb_queue_purge(&local->skb_queue_unreliable);
745
746         destroy_workqueue(local->workqueue);
747         wiphy_unregister(local->hw.wiphy);
748         ieee80211_wep_free(local);
749         ieee80211_led_exit(local);
750         kfree(local->int_scan_req);
751 }
752 EXPORT_SYMBOL(ieee80211_unregister_hw);
753
754 void ieee80211_free_hw(struct ieee80211_hw *hw)
755 {
756         struct ieee80211_local *local = hw_to_local(hw);
757
758         mutex_destroy(&local->iflist_mtx);
759         mutex_destroy(&local->scan_mtx);
760
761         wiphy_free(local->hw.wiphy);
762 }
763 EXPORT_SYMBOL(ieee80211_free_hw);
764
765 static int __init ieee80211_init(void)
766 {
767         struct sk_buff *skb;
768         int ret;
769
770         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
771         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
772                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
773
774         ret = rc80211_minstrel_init();
775         if (ret)
776                 return ret;
777
778         ret = rc80211_minstrel_ht_init();
779         if (ret)
780                 goto err_minstrel;
781
782         ret = rc80211_pid_init();
783         if (ret)
784                 goto err_pid;
785
786         ret = ieee80211_iface_init();
787         if (ret)
788                 goto err_netdev;
789
790         return 0;
791  err_netdev:
792         rc80211_pid_exit();
793  err_pid:
794         rc80211_minstrel_ht_exit();
795  err_minstrel:
796         rc80211_minstrel_exit();
797
798         return ret;
799 }
800
801 static void __exit ieee80211_exit(void)
802 {
803         rc80211_pid_exit();
804         rc80211_minstrel_ht_exit();
805         rc80211_minstrel_exit();
806
807         /*
808          * For key todo, it'll be empty by now but the work
809          * might still be scheduled.
810          */
811         flush_scheduled_work();
812
813         if (mesh_allocated)
814                 ieee80211s_stop();
815
816         ieee80211_iface_exit();
817 }
818
819
820 subsys_initcall(ieee80211_init);
821 module_exit(ieee80211_exit);
822
823 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
824 MODULE_LICENSE("GPL");