mac80211: unify scan and work mutexes
[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         u32 offchannel_flag;
103
104         might_sleep();
105
106         scan_chan = local->scan_channel;
107
108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109         if (scan_chan) {
110                 chan = scan_chan;
111                 channel_type = NL80211_CHAN_NO_HT;
112                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
113         } else if (local->tmp_channel) {
114                 chan = scan_chan = local->tmp_channel;
115                 channel_type = local->tmp_channel_type;
116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
117         } else {
118                 chan = local->oper_channel;
119                 channel_type = local->_oper_channel_type;
120                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
121         }
122         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
123
124         if (offchannel_flag || chan != local->hw.conf.channel ||
125             channel_type != local->hw.conf.channel_type) {
126                 local->hw.conf.channel = chan;
127                 local->hw.conf.channel_type = channel_type;
128                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
129         }
130
131         if (!conf_is_ht(&local->hw.conf)) {
132                 /*
133                  * mac80211.h documents that this is only valid
134                  * when the channel is set to an HT type, and
135                  * that otherwise STATIC is used.
136                  */
137                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
138         } else if (local->hw.conf.smps_mode != local->smps_mode) {
139                 local->hw.conf.smps_mode = local->smps_mode;
140                 changed |= IEEE80211_CONF_CHANGE_SMPS;
141         }
142
143         if (scan_chan)
144                 power = chan->max_power;
145         else
146                 power = local->power_constr_level ?
147                         (chan->max_power - local->power_constr_level) :
148                         chan->max_power;
149
150         if (local->user_power_level >= 0)
151                 power = min(power, local->user_power_level);
152
153         if (local->hw.conf.power_level != power) {
154                 changed |= IEEE80211_CONF_CHANGE_POWER;
155                 local->hw.conf.power_level = power;
156         }
157
158         if (changed && local->open_count) {
159                 ret = drv_config(local, changed);
160                 /*
161                  * Goal:
162                  * HW reconfiguration should never fail, the driver has told
163                  * us what it can support so it should live up to that promise.
164                  *
165                  * Current status:
166                  * rfkill is not integrated with mac80211 and a
167                  * configuration command can thus fail if hardware rfkill
168                  * is enabled
169                  *
170                  * FIXME: integrate rfkill with mac80211 and then add this
171                  * WARN_ON() back
172                  *
173                  */
174                 /* WARN_ON(ret); */
175         }
176
177         return ret;
178 }
179
180 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
181                                       u32 changed)
182 {
183         struct ieee80211_local *local = sdata->local;
184         static const u8 zero[ETH_ALEN] = { 0 };
185
186         if (!changed)
187                 return;
188
189         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
190                 /*
191                  * While not associated, claim a BSSID of all-zeroes
192                  * so that drivers don't do any weird things with the
193                  * BSSID at that time.
194                  */
195                 if (sdata->vif.bss_conf.assoc)
196                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
197                 else
198                         sdata->vif.bss_conf.bssid = zero;
199         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
200                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
201         else if (sdata->vif.type == NL80211_IFTYPE_AP)
202                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
203         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
204                 sdata->vif.bss_conf.bssid = zero;
205         } else {
206                 WARN_ON(1);
207                 return;
208         }
209
210         switch (sdata->vif.type) {
211         case NL80211_IFTYPE_AP:
212         case NL80211_IFTYPE_ADHOC:
213         case NL80211_IFTYPE_MESH_POINT:
214                 break;
215         default:
216                 /* do not warn to simplify caller in scan.c */
217                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
218                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
219                         return;
220                 break;
221         }
222
223         if (changed & BSS_CHANGED_BEACON_ENABLED) {
224                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
225                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
226                         sdata->vif.bss_conf.enable_beacon = false;
227                 } else {
228                         /*
229                          * Beacon should be enabled, but AP mode must
230                          * check whether there is a beacon configured.
231                          */
232                         switch (sdata->vif.type) {
233                         case NL80211_IFTYPE_AP:
234                                 sdata->vif.bss_conf.enable_beacon =
235                                         !!sdata->u.ap.beacon;
236                                 break;
237                         case NL80211_IFTYPE_ADHOC:
238                                 sdata->vif.bss_conf.enable_beacon =
239                                         !!sdata->u.ibss.presp;
240                                 break;
241                         case NL80211_IFTYPE_MESH_POINT:
242                                 sdata->vif.bss_conf.enable_beacon = true;
243                                 break;
244                         default:
245                                 /* not reached */
246                                 WARN_ON(1);
247                                 break;
248                         }
249                 }
250         }
251
252         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
253 }
254
255 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
256 {
257         sdata->vif.bss_conf.use_cts_prot = false;
258         sdata->vif.bss_conf.use_short_preamble = false;
259         sdata->vif.bss_conf.use_short_slot = false;
260         return BSS_CHANGED_ERP_CTS_PROT |
261                BSS_CHANGED_ERP_PREAMBLE |
262                BSS_CHANGED_ERP_SLOT;
263 }
264
265 static void ieee80211_tasklet_handler(unsigned long data)
266 {
267         struct ieee80211_local *local = (struct ieee80211_local *) data;
268         struct sk_buff *skb;
269
270         while ((skb = skb_dequeue(&local->skb_queue)) ||
271                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
272                 switch (skb->pkt_type) {
273                 case IEEE80211_RX_MSG:
274                         /* Clear skb->pkt_type in order to not confuse kernel
275                          * netstack. */
276                         skb->pkt_type = 0;
277                         ieee80211_rx(local_to_hw(local), skb);
278                         break;
279                 case IEEE80211_TX_STATUS_MSG:
280                         skb->pkt_type = 0;
281                         ieee80211_tx_status(local_to_hw(local), skb);
282                         break;
283                 default:
284                         WARN(1, "mac80211: Packet is of unknown type %d\n",
285                              skb->pkt_type);
286                         dev_kfree_skb(skb);
287                         break;
288                 }
289         }
290 }
291
292 static void ieee80211_restart_work(struct work_struct *work)
293 {
294         struct ieee80211_local *local =
295                 container_of(work, struct ieee80211_local, restart_work);
296
297         rtnl_lock();
298         ieee80211_reconfig(local);
299         rtnl_unlock();
300 }
301
302 void ieee80211_restart_hw(struct ieee80211_hw *hw)
303 {
304         struct ieee80211_local *local = hw_to_local(hw);
305
306         trace_api_restart_hw(local);
307
308         /* use this reason, __ieee80211_resume will unblock it */
309         ieee80211_stop_queues_by_reason(hw,
310                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
311
312         schedule_work(&local->restart_work);
313 }
314 EXPORT_SYMBOL(ieee80211_restart_hw);
315
316 static void ieee80211_recalc_smps_work(struct work_struct *work)
317 {
318         struct ieee80211_local *local =
319                 container_of(work, struct ieee80211_local, recalc_smps);
320
321         mutex_lock(&local->iflist_mtx);
322         ieee80211_recalc_smps(local, NULL);
323         mutex_unlock(&local->iflist_mtx);
324 }
325
326 #ifdef CONFIG_INET
327 static int ieee80211_ifa_changed(struct notifier_block *nb,
328                                  unsigned long data, void *arg)
329 {
330         struct in_ifaddr *ifa = arg;
331         struct ieee80211_local *local =
332                 container_of(nb, struct ieee80211_local,
333                              ifa_notifier);
334         struct net_device *ndev = ifa->ifa_dev->dev;
335         struct wireless_dev *wdev = ndev->ieee80211_ptr;
336         struct in_device *idev;
337         struct ieee80211_sub_if_data *sdata;
338         struct ieee80211_bss_conf *bss_conf;
339         struct ieee80211_if_managed *ifmgd;
340         int c = 0;
341
342         if (!netif_running(ndev))
343                 return NOTIFY_DONE;
344
345         /* Make sure it's our interface that got changed */
346         if (!wdev)
347                 return NOTIFY_DONE;
348
349         if (wdev->wiphy != local->hw.wiphy)
350                 return NOTIFY_DONE;
351
352         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
353         bss_conf = &sdata->vif.bss_conf;
354
355         /* ARP filtering is only supported in managed mode */
356         if (sdata->vif.type != NL80211_IFTYPE_STATION)
357                 return NOTIFY_DONE;
358
359         idev = sdata->dev->ip_ptr;
360         if (!idev)
361                 return NOTIFY_DONE;
362
363         ifmgd = &sdata->u.mgd;
364         mutex_lock(&ifmgd->mtx);
365
366         /* Copy the addresses to the bss_conf list */
367         ifa = idev->ifa_list;
368         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
369                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
370                 ifa = ifa->ifa_next;
371                 c++;
372         }
373
374         /* If not all addresses fit the list, disable filtering */
375         if (ifa) {
376                 sdata->arp_filter_state = false;
377                 c = 0;
378         } else {
379                 sdata->arp_filter_state = true;
380         }
381         bss_conf->arp_addr_cnt = c;
382
383         /* Configure driver only if associated */
384         if (ifmgd->associated) {
385                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
386                 ieee80211_bss_info_change_notify(sdata,
387                                                  BSS_CHANGED_ARP_FILTER);
388         }
389
390         mutex_unlock(&ifmgd->mtx);
391
392         return NOTIFY_DONE;
393 }
394 #endif
395
396 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
397 {
398         struct ieee80211_local *local =
399                 container_of(napi, struct ieee80211_local, napi);
400
401         return local->ops->napi_poll(&local->hw, budget);
402 }
403
404 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
405 {
406         struct ieee80211_local *local = hw_to_local(hw);
407
408         napi_schedule(&local->napi);
409 }
410 EXPORT_SYMBOL(ieee80211_napi_schedule);
411
412 void ieee80211_napi_complete(struct ieee80211_hw *hw)
413 {
414         struct ieee80211_local *local = hw_to_local(hw);
415
416         napi_complete(&local->napi);
417 }
418 EXPORT_SYMBOL(ieee80211_napi_complete);
419
420 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
421                                         const struct ieee80211_ops *ops)
422 {
423         struct ieee80211_local *local;
424         int priv_size, i;
425         struct wiphy *wiphy;
426
427         /* Ensure 32-byte alignment of our private data and hw private data.
428          * We use the wiphy priv data for both our ieee80211_local and for
429          * the driver's private data
430          *
431          * In memory it'll be like this:
432          *
433          * +-------------------------+
434          * | struct wiphy           |
435          * +-------------------------+
436          * | struct ieee80211_local  |
437          * +-------------------------+
438          * | driver's private data   |
439          * +-------------------------+
440          *
441          */
442         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
443
444         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
445
446         if (!wiphy)
447                 return NULL;
448
449         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
450                         WIPHY_FLAG_4ADDR_AP |
451                         WIPHY_FLAG_4ADDR_STATION;
452         wiphy->privid = mac80211_wiphy_privid;
453
454         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
455
456         local = wiphy_priv(wiphy);
457
458         local->hw.wiphy = wiphy;
459
460         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
461
462         BUG_ON(!ops->tx);
463         BUG_ON(!ops->start);
464         BUG_ON(!ops->stop);
465         BUG_ON(!ops->config);
466         BUG_ON(!ops->add_interface);
467         BUG_ON(!ops->remove_interface);
468         BUG_ON(!ops->configure_filter);
469         local->ops = ops;
470
471         /* set up some defaults */
472         local->hw.queues = 1;
473         local->hw.max_rates = 1;
474         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
475         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
476         local->user_power_level = -1;
477         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
478         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
479
480         INIT_LIST_HEAD(&local->interfaces);
481
482         __hw_addr_init(&local->mc_list);
483
484         mutex_init(&local->iflist_mtx);
485         mutex_init(&local->mtx);
486
487         mutex_init(&local->key_mtx);
488         spin_lock_init(&local->filter_lock);
489         spin_lock_init(&local->queue_stop_reason_lock);
490
491         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
492
493         ieee80211_work_init(local);
494
495         INIT_WORK(&local->restart_work, ieee80211_restart_work);
496
497         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
498         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
499         local->smps_mode = IEEE80211_SMPS_OFF;
500
501         INIT_WORK(&local->dynamic_ps_enable_work,
502                   ieee80211_dynamic_ps_enable_work);
503         INIT_WORK(&local->dynamic_ps_disable_work,
504                   ieee80211_dynamic_ps_disable_work);
505         setup_timer(&local->dynamic_ps_timer,
506                     ieee80211_dynamic_ps_timer, (unsigned long) local);
507
508         sta_info_init(local);
509
510         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
511                 skb_queue_head_init(&local->pending[i]);
512                 atomic_set(&local->agg_queue_stop[i], 0);
513         }
514         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
515                      (unsigned long)local);
516
517         tasklet_init(&local->tasklet,
518                      ieee80211_tasklet_handler,
519                      (unsigned long) local);
520
521         skb_queue_head_init(&local->skb_queue);
522         skb_queue_head_init(&local->skb_queue_unreliable);
523
524         /* init dummy netdev for use w/ NAPI */
525         init_dummy_netdev(&local->napi_dev);
526
527         return local_to_hw(local);
528 }
529 EXPORT_SYMBOL(ieee80211_alloc_hw);
530
531 int ieee80211_register_hw(struct ieee80211_hw *hw)
532 {
533         struct ieee80211_local *local = hw_to_local(hw);
534         int result;
535         enum ieee80211_band band;
536         int channels, max_bitrates;
537         bool supp_ht;
538         static const u32 cipher_suites[] = {
539                 WLAN_CIPHER_SUITE_WEP40,
540                 WLAN_CIPHER_SUITE_WEP104,
541                 WLAN_CIPHER_SUITE_TKIP,
542                 WLAN_CIPHER_SUITE_CCMP,
543
544                 /* keep last -- depends on hw flags! */
545                 WLAN_CIPHER_SUITE_AES_CMAC
546         };
547
548         /*
549          * generic code guarantees at least one band,
550          * set this very early because much code assumes
551          * that hw.conf.channel is assigned
552          */
553         channels = 0;
554         max_bitrates = 0;
555         supp_ht = false;
556         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
557                 struct ieee80211_supported_band *sband;
558
559                 sband = local->hw.wiphy->bands[band];
560                 if (!sband)
561                         continue;
562                 if (!local->oper_channel) {
563                         /* init channel we're on */
564                         local->hw.conf.channel =
565                         local->oper_channel = &sband->channels[0];
566                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
567                 }
568                 channels += sband->n_channels;
569
570                 if (max_bitrates < sband->n_bitrates)
571                         max_bitrates = sband->n_bitrates;
572                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
573         }
574
575         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
576                                       sizeof(void *) * channels, GFP_KERNEL);
577         if (!local->int_scan_req)
578                 return -ENOMEM;
579
580         /* if low-level driver supports AP, we also support VLAN */
581         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
582                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
583
584         /* mac80211 always supports monitor */
585         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
586
587         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
588                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
589         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
590                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
591
592         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
593              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
594              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
595
596         /*
597          * Calculate scan IE length -- we need this to alloc
598          * memory and to subtract from the driver limit. It
599          * includes the (extended) supported rates and HT
600          * information -- SSID is the driver's responsibility.
601          */
602         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
603         if (supp_ht)
604                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
605
606         if (!local->ops->hw_scan) {
607                 /* For hw_scan, driver needs to set these up. */
608                 local->hw.wiphy->max_scan_ssids = 4;
609                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
610         }
611
612         /*
613          * If the driver supports any scan IEs, then assume the
614          * limit includes the IEs mac80211 will add, otherwise
615          * leave it at zero and let the driver sort it out; we
616          * still pass our IEs to the driver but userspace will
617          * not be allowed to in that case.
618          */
619         if (local->hw.wiphy->max_scan_ie_len)
620                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
621
622         local->hw.wiphy->cipher_suites = cipher_suites;
623         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
624         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
625                 local->hw.wiphy->n_cipher_suites--;
626
627         result = wiphy_register(local->hw.wiphy);
628         if (result < 0)
629                 goto fail_wiphy_register;
630
631         /*
632          * We use the number of queues for feature tests (QoS, HT) internally
633          * so restrict them appropriately.
634          */
635         if (hw->queues > IEEE80211_MAX_QUEUES)
636                 hw->queues = IEEE80211_MAX_QUEUES;
637
638         local->workqueue =
639                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
640         if (!local->workqueue) {
641                 result = -ENOMEM;
642                 goto fail_workqueue;
643         }
644
645         /*
646          * The hardware needs headroom for sending the frame,
647          * and we need some headroom for passing the frame to monitor
648          * interfaces, but never both at the same time.
649          */
650         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
651                         sizeof(struct ieee80211_tx_status_rtap_hdr));
652         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
653                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
654
655         debugfs_hw_add(local);
656
657         /*
658          * if the driver doesn't specify a max listen interval we
659          * use 5 which should be a safe default
660          */
661         if (local->hw.max_listen_interval == 0)
662                 local->hw.max_listen_interval = 5;
663
664         local->hw.conf.listen_interval = local->hw.max_listen_interval;
665
666         local->dynamic_ps_forced_timeout = -1;
667
668         result = sta_info_start(local);
669         if (result < 0)
670                 goto fail_sta_info;
671
672         result = ieee80211_wep_init(local);
673         if (result < 0)
674                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
675                        wiphy_name(local->hw.wiphy), result);
676
677         rtnl_lock();
678
679         result = ieee80211_init_rate_ctrl_alg(local,
680                                               hw->rate_control_algorithm);
681         if (result < 0) {
682                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
683                        "algorithm\n", wiphy_name(local->hw.wiphy));
684                 goto fail_rate;
685         }
686
687         /* add one default STA interface if supported */
688         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
689                 result = ieee80211_if_add(local, "wlan%d", NULL,
690                                           NL80211_IFTYPE_STATION, NULL);
691                 if (result)
692                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
693                                wiphy_name(local->hw.wiphy));
694         }
695
696         rtnl_unlock();
697
698         ieee80211_led_init(local);
699
700         local->network_latency_notifier.notifier_call =
701                 ieee80211_max_network_latency;
702         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
703                                      &local->network_latency_notifier);
704         if (result) {
705                 rtnl_lock();
706                 goto fail_pm_qos;
707         }
708
709 #ifdef CONFIG_INET
710         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
711         result = register_inetaddr_notifier(&local->ifa_notifier);
712         if (result)
713                 goto fail_ifa;
714 #endif
715
716         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
717                         local->hw.napi_weight);
718
719         return 0;
720
721 #ifdef CONFIG_INET
722  fail_ifa:
723         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
724                                &local->network_latency_notifier);
725         rtnl_lock();
726 #endif
727  fail_pm_qos:
728         ieee80211_led_exit(local);
729         ieee80211_remove_interfaces(local);
730  fail_rate:
731         rtnl_unlock();
732         ieee80211_wep_free(local);
733         sta_info_stop(local);
734  fail_sta_info:
735         destroy_workqueue(local->workqueue);
736  fail_workqueue:
737         wiphy_unregister(local->hw.wiphy);
738  fail_wiphy_register:
739         kfree(local->int_scan_req);
740         return result;
741 }
742 EXPORT_SYMBOL(ieee80211_register_hw);
743
744 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
745 {
746         struct ieee80211_local *local = hw_to_local(hw);
747
748         tasklet_kill(&local->tx_pending_tasklet);
749         tasklet_kill(&local->tasklet);
750
751         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
752                                &local->network_latency_notifier);
753 #ifdef CONFIG_INET
754         unregister_inetaddr_notifier(&local->ifa_notifier);
755 #endif
756
757         rtnl_lock();
758
759         /*
760          * At this point, interface list manipulations are fine
761          * because the driver cannot be handing us frames any
762          * more and the tasklet is killed.
763          */
764         ieee80211_remove_interfaces(local);
765
766         rtnl_unlock();
767
768         cancel_work_sync(&local->reconfig_filter);
769
770         ieee80211_clear_tx_pending(local);
771         sta_info_stop(local);
772         rate_control_deinitialize(local);
773
774         if (skb_queue_len(&local->skb_queue) ||
775             skb_queue_len(&local->skb_queue_unreliable))
776                 printk(KERN_WARNING "%s: skb_queue not empty\n",
777                        wiphy_name(local->hw.wiphy));
778         skb_queue_purge(&local->skb_queue);
779         skb_queue_purge(&local->skb_queue_unreliable);
780
781         destroy_workqueue(local->workqueue);
782         wiphy_unregister(local->hw.wiphy);
783         ieee80211_wep_free(local);
784         ieee80211_led_exit(local);
785         kfree(local->int_scan_req);
786 }
787 EXPORT_SYMBOL(ieee80211_unregister_hw);
788
789 void ieee80211_free_hw(struct ieee80211_hw *hw)
790 {
791         struct ieee80211_local *local = hw_to_local(hw);
792
793         mutex_destroy(&local->iflist_mtx);
794         mutex_destroy(&local->mtx);
795
796         wiphy_free(local->hw.wiphy);
797 }
798 EXPORT_SYMBOL(ieee80211_free_hw);
799
800 static int __init ieee80211_init(void)
801 {
802         struct sk_buff *skb;
803         int ret;
804
805         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
806         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
807                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
808
809         ret = rc80211_minstrel_init();
810         if (ret)
811                 return ret;
812
813         ret = rc80211_minstrel_ht_init();
814         if (ret)
815                 goto err_minstrel;
816
817         ret = rc80211_pid_init();
818         if (ret)
819                 goto err_pid;
820
821         ret = ieee80211_iface_init();
822         if (ret)
823                 goto err_netdev;
824
825         return 0;
826  err_netdev:
827         rc80211_pid_exit();
828  err_pid:
829         rc80211_minstrel_ht_exit();
830  err_minstrel:
831         rc80211_minstrel_exit();
832
833         return ret;
834 }
835
836 static void __exit ieee80211_exit(void)
837 {
838         rc80211_pid_exit();
839         rc80211_minstrel_ht_exit();
840         rc80211_minstrel_exit();
841
842         /*
843          * For key todo, it'll be empty by now but the work
844          * might still be scheduled.
845          */
846         flush_scheduled_work();
847
848         if (mesh_allocated)
849                 ieee80211s_stop();
850
851         ieee80211_iface_exit();
852 }
853
854
855 subsys_initcall(ieee80211_init);
856 module_exit(ieee80211_exit);
857
858 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
859 MODULE_LICENSE("GPL");