mac80211: assure we also cancel deferred scan request
[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                    local->oper_channel != local->tmp_channel) {
115                 chan = scan_chan = local->tmp_channel;
116                 channel_type = local->tmp_channel_type;
117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
118         } else {
119                 chan = local->oper_channel;
120                 channel_type = local->_oper_channel_type;
121                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
122         }
123         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
124
125         if (offchannel_flag || chan != local->hw.conf.channel ||
126             channel_type != local->hw.conf.channel_type) {
127                 local->hw.conf.channel = chan;
128                 local->hw.conf.channel_type = channel_type;
129                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
130         }
131
132         if (!conf_is_ht(&local->hw.conf)) {
133                 /*
134                  * mac80211.h documents that this is only valid
135                  * when the channel is set to an HT type, and
136                  * that otherwise STATIC is used.
137                  */
138                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
139         } else if (local->hw.conf.smps_mode != local->smps_mode) {
140                 local->hw.conf.smps_mode = local->smps_mode;
141                 changed |= IEEE80211_CONF_CHANGE_SMPS;
142         }
143
144         if (scan_chan)
145                 power = chan->max_power;
146         else
147                 power = local->power_constr_level ?
148                         (chan->max_power - local->power_constr_level) :
149                         chan->max_power;
150
151         if (local->user_power_level >= 0)
152                 power = min(power, local->user_power_level);
153
154         if (local->hw.conf.power_level != power) {
155                 changed |= IEEE80211_CONF_CHANGE_POWER;
156                 local->hw.conf.power_level = power;
157         }
158
159         if (changed && local->open_count) {
160                 ret = drv_config(local, changed);
161                 /*
162                  * Goal:
163                  * HW reconfiguration should never fail, the driver has told
164                  * us what it can support so it should live up to that promise.
165                  *
166                  * Current status:
167                  * rfkill is not integrated with mac80211 and a
168                  * configuration command can thus fail if hardware rfkill
169                  * is enabled
170                  *
171                  * FIXME: integrate rfkill with mac80211 and then add this
172                  * WARN_ON() back
173                  *
174                  */
175                 /* WARN_ON(ret); */
176         }
177
178         return ret;
179 }
180
181 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
182                                       u32 changed)
183 {
184         struct ieee80211_local *local = sdata->local;
185         static const u8 zero[ETH_ALEN] = { 0 };
186
187         if (!changed)
188                 return;
189
190         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
191                 /*
192                  * While not associated, claim a BSSID of all-zeroes
193                  * so that drivers don't do any weird things with the
194                  * BSSID at that time.
195                  */
196                 if (sdata->vif.bss_conf.assoc)
197                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
198                 else
199                         sdata->vif.bss_conf.bssid = zero;
200         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
201                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
202         else if (sdata->vif.type == NL80211_IFTYPE_AP)
203                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
204         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
205                 sdata->vif.bss_conf.bssid = NULL;
206         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
207                 sdata->vif.bss_conf.bssid = zero;
208         } else {
209                 WARN_ON(1);
210                 return;
211         }
212
213         switch (sdata->vif.type) {
214         case NL80211_IFTYPE_AP:
215         case NL80211_IFTYPE_ADHOC:
216         case NL80211_IFTYPE_WDS:
217         case NL80211_IFTYPE_MESH_POINT:
218                 break;
219         default:
220                 /* do not warn to simplify caller in scan.c */
221                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
222                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
223                         return;
224                 break;
225         }
226
227         if (changed & BSS_CHANGED_BEACON_ENABLED) {
228                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
229                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
230                         sdata->vif.bss_conf.enable_beacon = false;
231                 } else {
232                         /*
233                          * Beacon should be enabled, but AP mode must
234                          * check whether there is a beacon configured.
235                          */
236                         switch (sdata->vif.type) {
237                         case NL80211_IFTYPE_AP:
238                                 sdata->vif.bss_conf.enable_beacon =
239                                         !!sdata->u.ap.beacon;
240                                 break;
241                         case NL80211_IFTYPE_ADHOC:
242                                 sdata->vif.bss_conf.enable_beacon =
243                                         !!sdata->u.ibss.presp;
244                                 break;
245                         case NL80211_IFTYPE_MESH_POINT:
246                                 sdata->vif.bss_conf.enable_beacon = true;
247                                 break;
248                         default:
249                                 /* not reached */
250                                 WARN_ON(1);
251                                 break;
252                         }
253                 }
254         }
255
256         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
257 }
258
259 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
260 {
261         sdata->vif.bss_conf.use_cts_prot = false;
262         sdata->vif.bss_conf.use_short_preamble = false;
263         sdata->vif.bss_conf.use_short_slot = false;
264         return BSS_CHANGED_ERP_CTS_PROT |
265                BSS_CHANGED_ERP_PREAMBLE |
266                BSS_CHANGED_ERP_SLOT;
267 }
268
269 static void ieee80211_tasklet_handler(unsigned long data)
270 {
271         struct ieee80211_local *local = (struct ieee80211_local *) data;
272         struct sk_buff *skb;
273
274         while ((skb = skb_dequeue(&local->skb_queue)) ||
275                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
276                 switch (skb->pkt_type) {
277                 case IEEE80211_RX_MSG:
278                         /* Clear skb->pkt_type in order to not confuse kernel
279                          * netstack. */
280                         skb->pkt_type = 0;
281                         ieee80211_rx(local_to_hw(local), skb);
282                         break;
283                 case IEEE80211_TX_STATUS_MSG:
284                         skb->pkt_type = 0;
285                         ieee80211_tx_status(local_to_hw(local), skb);
286                         break;
287                 default:
288                         WARN(1, "mac80211: Packet is of unknown type %d\n",
289                              skb->pkt_type);
290                         dev_kfree_skb(skb);
291                         break;
292                 }
293         }
294 }
295
296 static void ieee80211_restart_work(struct work_struct *work)
297 {
298         struct ieee80211_local *local =
299                 container_of(work, struct ieee80211_local, restart_work);
300
301         /* wait for scan work complete */
302         flush_workqueue(local->workqueue);
303
304         mutex_lock(&local->mtx);
305         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
306                 "%s called with hardware scan in progress\n", __func__);
307         mutex_unlock(&local->mtx);
308
309         rtnl_lock();
310         ieee80211_scan_cancel(local);
311         ieee80211_reconfig(local);
312         rtnl_unlock();
313 }
314
315 void ieee80211_restart_hw(struct ieee80211_hw *hw)
316 {
317         struct ieee80211_local *local = hw_to_local(hw);
318
319         trace_api_restart_hw(local);
320
321         /* use this reason, ieee80211_reconfig will unblock it */
322         ieee80211_stop_queues_by_reason(hw,
323                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
324
325         schedule_work(&local->restart_work);
326 }
327 EXPORT_SYMBOL(ieee80211_restart_hw);
328
329 static void ieee80211_recalc_smps_work(struct work_struct *work)
330 {
331         struct ieee80211_local *local =
332                 container_of(work, struct ieee80211_local, recalc_smps);
333
334         mutex_lock(&local->iflist_mtx);
335         ieee80211_recalc_smps(local);
336         mutex_unlock(&local->iflist_mtx);
337 }
338
339 #ifdef CONFIG_INET
340 static int ieee80211_ifa_changed(struct notifier_block *nb,
341                                  unsigned long data, void *arg)
342 {
343         struct in_ifaddr *ifa = arg;
344         struct ieee80211_local *local =
345                 container_of(nb, struct ieee80211_local,
346                              ifa_notifier);
347         struct net_device *ndev = ifa->ifa_dev->dev;
348         struct wireless_dev *wdev = ndev->ieee80211_ptr;
349         struct in_device *idev;
350         struct ieee80211_sub_if_data *sdata;
351         struct ieee80211_bss_conf *bss_conf;
352         struct ieee80211_if_managed *ifmgd;
353         int c = 0;
354
355         /* Make sure it's our interface that got changed */
356         if (!wdev)
357                 return NOTIFY_DONE;
358
359         if (wdev->wiphy != local->hw.wiphy)
360                 return NOTIFY_DONE;
361
362         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
363         bss_conf = &sdata->vif.bss_conf;
364
365         if (!ieee80211_sdata_running(sdata))
366                 return NOTIFY_DONE;
367
368         /* ARP filtering is only supported in managed mode */
369         if (sdata->vif.type != NL80211_IFTYPE_STATION)
370                 return NOTIFY_DONE;
371
372         idev = sdata->dev->ip_ptr;
373         if (!idev)
374                 return NOTIFY_DONE;
375
376         ifmgd = &sdata->u.mgd;
377         mutex_lock(&ifmgd->mtx);
378
379         /* Copy the addresses to the bss_conf list */
380         ifa = idev->ifa_list;
381         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
382                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
383                 ifa = ifa->ifa_next;
384                 c++;
385         }
386
387         /* If not all addresses fit the list, disable filtering */
388         if (ifa) {
389                 sdata->arp_filter_state = false;
390                 c = 0;
391         } else {
392                 sdata->arp_filter_state = true;
393         }
394         bss_conf->arp_addr_cnt = c;
395
396         /* Configure driver only if associated */
397         if (ifmgd->associated) {
398                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
399                 ieee80211_bss_info_change_notify(sdata,
400                                                  BSS_CHANGED_ARP_FILTER);
401         }
402
403         mutex_unlock(&ifmgd->mtx);
404
405         return NOTIFY_DONE;
406 }
407 #endif
408
409 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
410 {
411         struct ieee80211_local *local =
412                 container_of(napi, struct ieee80211_local, napi);
413
414         return local->ops->napi_poll(&local->hw, budget);
415 }
416
417 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
418 {
419         struct ieee80211_local *local = hw_to_local(hw);
420
421         napi_schedule(&local->napi);
422 }
423 EXPORT_SYMBOL(ieee80211_napi_schedule);
424
425 void ieee80211_napi_complete(struct ieee80211_hw *hw)
426 {
427         struct ieee80211_local *local = hw_to_local(hw);
428
429         napi_complete(&local->napi);
430 }
431 EXPORT_SYMBOL(ieee80211_napi_complete);
432
433 /* There isn't a lot of sense in it, but you can transmit anything you like */
434 static const struct ieee80211_txrx_stypes
435 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
436         [NL80211_IFTYPE_ADHOC] = {
437                 .tx = 0xffff,
438                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
439         },
440         [NL80211_IFTYPE_STATION] = {
441                 .tx = 0xffff,
442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
443                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
444         },
445         [NL80211_IFTYPE_AP] = {
446                 .tx = 0xffff,
447                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
448                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
450                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
451                         BIT(IEEE80211_STYPE_AUTH >> 4) |
452                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
453                         BIT(IEEE80211_STYPE_ACTION >> 4),
454         },
455         [NL80211_IFTYPE_AP_VLAN] = {
456                 /* copy AP */
457                 .tx = 0xffff,
458                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
459                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
460                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
461                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
462                         BIT(IEEE80211_STYPE_AUTH >> 4) |
463                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
464                         BIT(IEEE80211_STYPE_ACTION >> 4),
465         },
466         [NL80211_IFTYPE_P2P_CLIENT] = {
467                 .tx = 0xffff,
468                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
469                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
470         },
471         [NL80211_IFTYPE_P2P_GO] = {
472                 .tx = 0xffff,
473                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
474                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
475                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
476                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
477                         BIT(IEEE80211_STYPE_AUTH >> 4) |
478                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
479                         BIT(IEEE80211_STYPE_ACTION >> 4),
480         },
481 };
482
483 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
484                                         const struct ieee80211_ops *ops)
485 {
486         struct ieee80211_local *local;
487         int priv_size, i;
488         struct wiphy *wiphy;
489
490         /* Ensure 32-byte alignment of our private data and hw private data.
491          * We use the wiphy priv data for both our ieee80211_local and for
492          * the driver's private data
493          *
494          * In memory it'll be like this:
495          *
496          * +-------------------------+
497          * | struct wiphy           |
498          * +-------------------------+
499          * | struct ieee80211_local  |
500          * +-------------------------+
501          * | driver's private data   |
502          * +-------------------------+
503          *
504          */
505         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
506
507         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
508
509         if (!wiphy)
510                 return NULL;
511
512         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
513
514         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
515                         WIPHY_FLAG_4ADDR_AP |
516                         WIPHY_FLAG_4ADDR_STATION;
517         wiphy->privid = mac80211_wiphy_privid;
518
519         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
520
521         local = wiphy_priv(wiphy);
522
523         local->hw.wiphy = wiphy;
524
525         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
526
527         BUG_ON(!ops->tx);
528         BUG_ON(!ops->start);
529         BUG_ON(!ops->stop);
530         BUG_ON(!ops->config);
531         BUG_ON(!ops->add_interface);
532         BUG_ON(!ops->remove_interface);
533         BUG_ON(!ops->configure_filter);
534         local->ops = ops;
535
536         /* set up some defaults */
537         local->hw.queues = 1;
538         local->hw.max_rates = 1;
539         local->hw.max_report_rates = 0;
540         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
541         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
542         local->user_power_level = -1;
543         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
544         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
545
546         INIT_LIST_HEAD(&local->interfaces);
547
548         __hw_addr_init(&local->mc_list);
549
550         mutex_init(&local->iflist_mtx);
551         mutex_init(&local->mtx);
552
553         mutex_init(&local->key_mtx);
554         spin_lock_init(&local->filter_lock);
555         spin_lock_init(&local->queue_stop_reason_lock);
556
557         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
558
559         ieee80211_work_init(local);
560
561         INIT_WORK(&local->restart_work, ieee80211_restart_work);
562
563         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
564         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
565         local->smps_mode = IEEE80211_SMPS_OFF;
566
567         INIT_WORK(&local->dynamic_ps_enable_work,
568                   ieee80211_dynamic_ps_enable_work);
569         INIT_WORK(&local->dynamic_ps_disable_work,
570                   ieee80211_dynamic_ps_disable_work);
571         setup_timer(&local->dynamic_ps_timer,
572                     ieee80211_dynamic_ps_timer, (unsigned long) local);
573
574         sta_info_init(local);
575
576         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
577                 skb_queue_head_init(&local->pending[i]);
578                 atomic_set(&local->agg_queue_stop[i], 0);
579         }
580         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
581                      (unsigned long)local);
582
583         tasklet_init(&local->tasklet,
584                      ieee80211_tasklet_handler,
585                      (unsigned long) local);
586
587         skb_queue_head_init(&local->skb_queue);
588         skb_queue_head_init(&local->skb_queue_unreliable);
589
590         /* init dummy netdev for use w/ NAPI */
591         init_dummy_netdev(&local->napi_dev);
592
593         return local_to_hw(local);
594 }
595 EXPORT_SYMBOL(ieee80211_alloc_hw);
596
597 int ieee80211_register_hw(struct ieee80211_hw *hw)
598 {
599         struct ieee80211_local *local = hw_to_local(hw);
600         int result;
601         enum ieee80211_band band;
602         int channels, max_bitrates;
603         bool supp_ht;
604         static const u32 cipher_suites[] = {
605                 /* keep WEP first, it may be removed below */
606                 WLAN_CIPHER_SUITE_WEP40,
607                 WLAN_CIPHER_SUITE_WEP104,
608                 WLAN_CIPHER_SUITE_TKIP,
609                 WLAN_CIPHER_SUITE_CCMP,
610
611                 /* keep last -- depends on hw flags! */
612                 WLAN_CIPHER_SUITE_AES_CMAC
613         };
614
615         if (hw->max_report_rates == 0)
616                 hw->max_report_rates = hw->max_rates;
617
618         /*
619          * generic code guarantees at least one band,
620          * set this very early because much code assumes
621          * that hw.conf.channel is assigned
622          */
623         channels = 0;
624         max_bitrates = 0;
625         supp_ht = false;
626         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
627                 struct ieee80211_supported_band *sband;
628
629                 sband = local->hw.wiphy->bands[band];
630                 if (!sband)
631                         continue;
632                 if (!local->oper_channel) {
633                         /* init channel we're on */
634                         local->hw.conf.channel =
635                         local->oper_channel = &sband->channels[0];
636                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
637                 }
638                 channels += sband->n_channels;
639
640                 if (max_bitrates < sband->n_bitrates)
641                         max_bitrates = sband->n_bitrates;
642                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
643         }
644
645         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
646                                       sizeof(void *) * channels, GFP_KERNEL);
647         if (!local->int_scan_req)
648                 return -ENOMEM;
649
650         /* if low-level driver supports AP, we also support VLAN */
651         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
652                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
653
654         /* mac80211 always supports monitor */
655         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
656
657 #ifndef CONFIG_MAC80211_MESH
658         /* mesh depends on Kconfig, but drivers should set it if they want */
659         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
660 #endif
661
662         /* mac80211 supports control port protocol changing */
663         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
664
665         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
666                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
667         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
668                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
669
670         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
671              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
672              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
673
674         /*
675          * Calculate scan IE length -- we need this to alloc
676          * memory and to subtract from the driver limit. It
677          * includes the (extended) supported rates and HT
678          * information -- SSID is the driver's responsibility.
679          */
680         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
681         if (supp_ht)
682                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
683
684         if (!local->ops->hw_scan) {
685                 /* For hw_scan, driver needs to set these up. */
686                 local->hw.wiphy->max_scan_ssids = 4;
687                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
688         }
689
690         /*
691          * If the driver supports any scan IEs, then assume the
692          * limit includes the IEs mac80211 will add, otherwise
693          * leave it at zero and let the driver sort it out; we
694          * still pass our IEs to the driver but userspace will
695          * not be allowed to in that case.
696          */
697         if (local->hw.wiphy->max_scan_ie_len)
698                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
699
700         /* Set up cipher suites unless driver already did */
701         if (!local->hw.wiphy->cipher_suites) {
702                 local->hw.wiphy->cipher_suites = cipher_suites;
703                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
704                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
705                         local->hw.wiphy->n_cipher_suites--;
706         }
707         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
708                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
709                         local->hw.wiphy->cipher_suites += 2;
710                         local->hw.wiphy->n_cipher_suites -= 2;
711                 } else {
712                         u32 *suites;
713                         int r, w = 0;
714
715                         /* Filter out WEP */
716
717                         suites = kmemdup(
718                                 local->hw.wiphy->cipher_suites,
719                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
720                                 GFP_KERNEL);
721                         if (!suites)
722                                 return -ENOMEM;
723                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
724                                 u32 suite = local->hw.wiphy->cipher_suites[r];
725                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
726                                     suite == WLAN_CIPHER_SUITE_WEP104)
727                                         continue;
728                                 suites[w++] = suite;
729                         }
730                         local->hw.wiphy->cipher_suites = suites;
731                         local->hw.wiphy->n_cipher_suites = w;
732                         local->wiphy_ciphers_allocated = true;
733                 }
734         }
735
736         result = wiphy_register(local->hw.wiphy);
737         if (result < 0)
738                 goto fail_wiphy_register;
739
740         /*
741          * We use the number of queues for feature tests (QoS, HT) internally
742          * so restrict them appropriately.
743          */
744         if (hw->queues > IEEE80211_MAX_QUEUES)
745                 hw->queues = IEEE80211_MAX_QUEUES;
746
747         local->workqueue =
748                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
749         if (!local->workqueue) {
750                 result = -ENOMEM;
751                 goto fail_workqueue;
752         }
753
754         /*
755          * The hardware needs headroom for sending the frame,
756          * and we need some headroom for passing the frame to monitor
757          * interfaces, but never both at the same time.
758          */
759         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
760                         sizeof(struct ieee80211_tx_status_rtap_hdr));
761         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
762                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
763
764         debugfs_hw_add(local);
765
766         /*
767          * if the driver doesn't specify a max listen interval we
768          * use 5 which should be a safe default
769          */
770         if (local->hw.max_listen_interval == 0)
771                 local->hw.max_listen_interval = 5;
772
773         local->hw.conf.listen_interval = local->hw.max_listen_interval;
774
775         local->dynamic_ps_forced_timeout = -1;
776
777         result = sta_info_start(local);
778         if (result < 0)
779                 goto fail_sta_info;
780
781         result = ieee80211_wep_init(local);
782         if (result < 0)
783                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
784                             result);
785
786         rtnl_lock();
787
788         result = ieee80211_init_rate_ctrl_alg(local,
789                                               hw->rate_control_algorithm);
790         if (result < 0) {
791                 wiphy_debug(local->hw.wiphy,
792                             "Failed to initialize rate control algorithm\n");
793                 goto fail_rate;
794         }
795
796         /* add one default STA interface if supported */
797         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
798                 result = ieee80211_if_add(local, "wlan%d", NULL,
799                                           NL80211_IFTYPE_STATION, NULL);
800                 if (result)
801                         wiphy_warn(local->hw.wiphy,
802                                    "Failed to add default virtual iface\n");
803         }
804
805         rtnl_unlock();
806
807         ieee80211_led_init(local);
808
809         local->network_latency_notifier.notifier_call =
810                 ieee80211_max_network_latency;
811         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
812                                      &local->network_latency_notifier);
813         if (result) {
814                 rtnl_lock();
815                 goto fail_pm_qos;
816         }
817
818 #ifdef CONFIG_INET
819         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
820         result = register_inetaddr_notifier(&local->ifa_notifier);
821         if (result)
822                 goto fail_ifa;
823 #endif
824
825         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
826                         local->hw.napi_weight);
827
828         return 0;
829
830 #ifdef CONFIG_INET
831  fail_ifa:
832         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
833                                &local->network_latency_notifier);
834         rtnl_lock();
835 #endif
836  fail_pm_qos:
837         ieee80211_led_exit(local);
838         ieee80211_remove_interfaces(local);
839  fail_rate:
840         rtnl_unlock();
841         ieee80211_wep_free(local);
842         sta_info_stop(local);
843  fail_sta_info:
844         destroy_workqueue(local->workqueue);
845  fail_workqueue:
846         wiphy_unregister(local->hw.wiphy);
847  fail_wiphy_register:
848         if (local->wiphy_ciphers_allocated)
849                 kfree(local->hw.wiphy->cipher_suites);
850         kfree(local->int_scan_req);
851         return result;
852 }
853 EXPORT_SYMBOL(ieee80211_register_hw);
854
855 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
856 {
857         struct ieee80211_local *local = hw_to_local(hw);
858
859         tasklet_kill(&local->tx_pending_tasklet);
860         tasklet_kill(&local->tasklet);
861
862         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
863                                &local->network_latency_notifier);
864 #ifdef CONFIG_INET
865         unregister_inetaddr_notifier(&local->ifa_notifier);
866 #endif
867
868         rtnl_lock();
869
870         /*
871          * At this point, interface list manipulations are fine
872          * because the driver cannot be handing us frames any
873          * more and the tasklet is killed.
874          */
875         ieee80211_remove_interfaces(local);
876
877         rtnl_unlock();
878
879         /*
880          * Now all work items will be gone, but the
881          * timer might still be armed, so delete it
882          */
883         del_timer_sync(&local->work_timer);
884
885         cancel_work_sync(&local->restart_work);
886         cancel_work_sync(&local->reconfig_filter);
887
888         ieee80211_clear_tx_pending(local);
889         sta_info_stop(local);
890         rate_control_deinitialize(local);
891
892         if (skb_queue_len(&local->skb_queue) ||
893             skb_queue_len(&local->skb_queue_unreliable))
894                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
895         skb_queue_purge(&local->skb_queue);
896         skb_queue_purge(&local->skb_queue_unreliable);
897
898         destroy_workqueue(local->workqueue);
899         wiphy_unregister(local->hw.wiphy);
900         ieee80211_wep_free(local);
901         ieee80211_led_exit(local);
902         kfree(local->int_scan_req);
903 }
904 EXPORT_SYMBOL(ieee80211_unregister_hw);
905
906 void ieee80211_free_hw(struct ieee80211_hw *hw)
907 {
908         struct ieee80211_local *local = hw_to_local(hw);
909
910         mutex_destroy(&local->iflist_mtx);
911         mutex_destroy(&local->mtx);
912
913         if (local->wiphy_ciphers_allocated)
914                 kfree(local->hw.wiphy->cipher_suites);
915
916         wiphy_free(local->hw.wiphy);
917 }
918 EXPORT_SYMBOL(ieee80211_free_hw);
919
920 static int __init ieee80211_init(void)
921 {
922         struct sk_buff *skb;
923         int ret;
924
925         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
926         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
927                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
928
929         ret = rc80211_minstrel_init();
930         if (ret)
931                 return ret;
932
933         ret = rc80211_minstrel_ht_init();
934         if (ret)
935                 goto err_minstrel;
936
937         ret = rc80211_pid_init();
938         if (ret)
939                 goto err_pid;
940
941         ret = ieee80211_iface_init();
942         if (ret)
943                 goto err_netdev;
944
945         return 0;
946  err_netdev:
947         rc80211_pid_exit();
948  err_pid:
949         rc80211_minstrel_ht_exit();
950  err_minstrel:
951         rc80211_minstrel_exit();
952
953         return ret;
954 }
955
956 static void __exit ieee80211_exit(void)
957 {
958         rc80211_pid_exit();
959         rc80211_minstrel_ht_exit();
960         rc80211_minstrel_exit();
961
962         /*
963          * For key todo, it'll be empty by now but the work
964          * might still be scheduled.
965          */
966         flush_scheduled_work();
967
968         if (mesh_allocated)
969                 ieee80211s_stop();
970
971         ieee80211_iface_exit();
972 }
973
974
975 subsys_initcall(ieee80211_init);
976 module_exit(ieee80211_exit);
977
978 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
979 MODULE_LICENSE("GPL");