cfg80211/mac80211: add mesh join/leave commands
[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_probe_req || local->probe_req_reg)
58                 new_flags |= FIF_PROBE_REQ;
59
60         if (local->fif_fcsfail)
61                 new_flags |= FIF_FCSFAIL;
62
63         if (local->fif_plcpfail)
64                 new_flags |= FIF_PLCPFAIL;
65
66         if (local->fif_control)
67                 new_flags |= FIF_CONTROL;
68
69         if (local->fif_other_bss)
70                 new_flags |= FIF_OTHER_BSS;
71
72         if (local->fif_pspoll)
73                 new_flags |= FIF_PSPOLL;
74
75         spin_lock_bh(&local->filter_lock);
76         changed_flags = local->filter_flags ^ new_flags;
77
78         mc = drv_prepare_multicast(local, &local->mc_list);
79         spin_unlock_bh(&local->filter_lock);
80
81         /* be a bit nasty */
82         new_flags |= (1<<31);
83
84         drv_configure_filter(local, changed_flags, &new_flags, mc);
85
86         WARN_ON(new_flags & (1<<31));
87
88         local->filter_flags = new_flags & ~(1<<31);
89 }
90
91 static void ieee80211_reconfig_filter(struct work_struct *work)
92 {
93         struct ieee80211_local *local =
94                 container_of(work, struct ieee80211_local, reconfig_filter);
95
96         ieee80211_configure_filter(local);
97 }
98
99 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
100 {
101         struct ieee80211_channel *chan, *scan_chan;
102         int ret = 0;
103         int power;
104         enum nl80211_channel_type channel_type;
105         u32 offchannel_flag;
106
107         might_sleep();
108
109         scan_chan = local->scan_channel;
110
111         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
112         if (scan_chan) {
113                 chan = scan_chan;
114                 channel_type = NL80211_CHAN_NO_HT;
115                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
116         } else if (local->tmp_channel &&
117                    local->oper_channel != local->tmp_channel) {
118                 chan = scan_chan = local->tmp_channel;
119                 channel_type = local->tmp_channel_type;
120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
121         } else {
122                 chan = local->oper_channel;
123                 channel_type = local->_oper_channel_type;
124                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
125         }
126         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
127
128         if (offchannel_flag || chan != local->hw.conf.channel ||
129             channel_type != local->hw.conf.channel_type) {
130                 local->hw.conf.channel = chan;
131                 local->hw.conf.channel_type = channel_type;
132                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
133         }
134
135         if (!conf_is_ht(&local->hw.conf)) {
136                 /*
137                  * mac80211.h documents that this is only valid
138                  * when the channel is set to an HT type, and
139                  * that otherwise STATIC is used.
140                  */
141                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
142         } else if (local->hw.conf.smps_mode != local->smps_mode) {
143                 local->hw.conf.smps_mode = local->smps_mode;
144                 changed |= IEEE80211_CONF_CHANGE_SMPS;
145         }
146
147         if (scan_chan)
148                 power = chan->max_power;
149         else
150                 power = local->power_constr_level ?
151                         (chan->max_power - local->power_constr_level) :
152                         chan->max_power;
153
154         if (local->user_power_level >= 0)
155                 power = min(power, local->user_power_level);
156
157         if (local->hw.conf.power_level != power) {
158                 changed |= IEEE80211_CONF_CHANGE_POWER;
159                 local->hw.conf.power_level = power;
160         }
161
162         if (changed && local->open_count) {
163                 ret = drv_config(local, changed);
164                 /*
165                  * Goal:
166                  * HW reconfiguration should never fail, the driver has told
167                  * us what it can support so it should live up to that promise.
168                  *
169                  * Current status:
170                  * rfkill is not integrated with mac80211 and a
171                  * configuration command can thus fail if hardware rfkill
172                  * is enabled
173                  *
174                  * FIXME: integrate rfkill with mac80211 and then add this
175                  * WARN_ON() back
176                  *
177                  */
178                 /* WARN_ON(ret); */
179         }
180
181         return ret;
182 }
183
184 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
185                                       u32 changed)
186 {
187         struct ieee80211_local *local = sdata->local;
188         static const u8 zero[ETH_ALEN] = { 0 };
189
190         if (!changed)
191                 return;
192
193         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
194                 /*
195                  * While not associated, claim a BSSID of all-zeroes
196                  * so that drivers don't do any weird things with the
197                  * BSSID at that time.
198                  */
199                 if (sdata->vif.bss_conf.assoc)
200                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
201                 else
202                         sdata->vif.bss_conf.bssid = zero;
203         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
205         else if (sdata->vif.type == NL80211_IFTYPE_AP)
206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
207         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
208                 sdata->vif.bss_conf.bssid = NULL;
209         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
210                 sdata->vif.bss_conf.bssid = zero;
211         } else {
212                 WARN_ON(1);
213                 return;
214         }
215
216         switch (sdata->vif.type) {
217         case NL80211_IFTYPE_AP:
218         case NL80211_IFTYPE_ADHOC:
219         case NL80211_IFTYPE_WDS:
220         case NL80211_IFTYPE_MESH_POINT:
221                 break;
222         default:
223                 /* do not warn to simplify caller in scan.c */
224                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
225                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
226                         return;
227                 break;
228         }
229
230         if (changed & BSS_CHANGED_BEACON_ENABLED) {
231                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
232                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
233                         sdata->vif.bss_conf.enable_beacon = false;
234                 } else {
235                         /*
236                          * Beacon should be enabled, but AP mode must
237                          * check whether there is a beacon configured.
238                          */
239                         switch (sdata->vif.type) {
240                         case NL80211_IFTYPE_AP:
241                                 sdata->vif.bss_conf.enable_beacon =
242                                         !!sdata->u.ap.beacon;
243                                 break;
244                         case NL80211_IFTYPE_ADHOC:
245                                 sdata->vif.bss_conf.enable_beacon =
246                                         !!sdata->u.ibss.presp;
247                                 break;
248                         case NL80211_IFTYPE_MESH_POINT:
249                                 sdata->vif.bss_conf.enable_beacon =
250                                         !!sdata->u.mesh.mesh_id_len;
251                                 break;
252                         default:
253                                 /* not reached */
254                                 WARN_ON(1);
255                                 break;
256                         }
257                 }
258         }
259
260         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
261 }
262
263 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
264 {
265         sdata->vif.bss_conf.use_cts_prot = false;
266         sdata->vif.bss_conf.use_short_preamble = false;
267         sdata->vif.bss_conf.use_short_slot = false;
268         return BSS_CHANGED_ERP_CTS_PROT |
269                BSS_CHANGED_ERP_PREAMBLE |
270                BSS_CHANGED_ERP_SLOT;
271 }
272
273 static void ieee80211_tasklet_handler(unsigned long data)
274 {
275         struct ieee80211_local *local = (struct ieee80211_local *) data;
276         struct sk_buff *skb;
277
278         while ((skb = skb_dequeue(&local->skb_queue)) ||
279                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
280                 switch (skb->pkt_type) {
281                 case IEEE80211_RX_MSG:
282                         /* Clear skb->pkt_type in order to not confuse kernel
283                          * netstack. */
284                         skb->pkt_type = 0;
285                         ieee80211_rx(local_to_hw(local), skb);
286                         break;
287                 case IEEE80211_TX_STATUS_MSG:
288                         skb->pkt_type = 0;
289                         ieee80211_tx_status(local_to_hw(local), skb);
290                         break;
291                 default:
292                         WARN(1, "mac80211: Packet is of unknown type %d\n",
293                              skb->pkt_type);
294                         dev_kfree_skb(skb);
295                         break;
296                 }
297         }
298 }
299
300 static void ieee80211_restart_work(struct work_struct *work)
301 {
302         struct ieee80211_local *local =
303                 container_of(work, struct ieee80211_local, restart_work);
304
305         /* wait for scan work complete */
306         flush_workqueue(local->workqueue);
307
308         mutex_lock(&local->mtx);
309         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
310                 "%s called with hardware scan in progress\n", __func__);
311         mutex_unlock(&local->mtx);
312
313         rtnl_lock();
314         ieee80211_scan_cancel(local);
315         ieee80211_reconfig(local);
316         rtnl_unlock();
317 }
318
319 void ieee80211_restart_hw(struct ieee80211_hw *hw)
320 {
321         struct ieee80211_local *local = hw_to_local(hw);
322
323         trace_api_restart_hw(local);
324
325         /* use this reason, ieee80211_reconfig will unblock it */
326         ieee80211_stop_queues_by_reason(hw,
327                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
328
329         schedule_work(&local->restart_work);
330 }
331 EXPORT_SYMBOL(ieee80211_restart_hw);
332
333 static void ieee80211_recalc_smps_work(struct work_struct *work)
334 {
335         struct ieee80211_local *local =
336                 container_of(work, struct ieee80211_local, recalc_smps);
337
338         mutex_lock(&local->iflist_mtx);
339         ieee80211_recalc_smps(local);
340         mutex_unlock(&local->iflist_mtx);
341 }
342
343 #ifdef CONFIG_INET
344 static int ieee80211_ifa_changed(struct notifier_block *nb,
345                                  unsigned long data, void *arg)
346 {
347         struct in_ifaddr *ifa = arg;
348         struct ieee80211_local *local =
349                 container_of(nb, struct ieee80211_local,
350                              ifa_notifier);
351         struct net_device *ndev = ifa->ifa_dev->dev;
352         struct wireless_dev *wdev = ndev->ieee80211_ptr;
353         struct in_device *idev;
354         struct ieee80211_sub_if_data *sdata;
355         struct ieee80211_bss_conf *bss_conf;
356         struct ieee80211_if_managed *ifmgd;
357         int c = 0;
358
359         /* Make sure it's our interface that got changed */
360         if (!wdev)
361                 return NOTIFY_DONE;
362
363         if (wdev->wiphy != local->hw.wiphy)
364                 return NOTIFY_DONE;
365
366         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
367         bss_conf = &sdata->vif.bss_conf;
368
369         if (!ieee80211_sdata_running(sdata))
370                 return NOTIFY_DONE;
371
372         /* ARP filtering is only supported in managed mode */
373         if (sdata->vif.type != NL80211_IFTYPE_STATION)
374                 return NOTIFY_DONE;
375
376         idev = __in_dev_get_rtnl(sdata->dev);
377         if (!idev)
378                 return NOTIFY_DONE;
379
380         ifmgd = &sdata->u.mgd;
381         mutex_lock(&ifmgd->mtx);
382
383         /* Copy the addresses to the bss_conf list */
384         ifa = idev->ifa_list;
385         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
386                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
387                 ifa = ifa->ifa_next;
388                 c++;
389         }
390
391         /* If not all addresses fit the list, disable filtering */
392         if (ifa) {
393                 sdata->arp_filter_state = false;
394                 c = 0;
395         } else {
396                 sdata->arp_filter_state = true;
397         }
398         bss_conf->arp_addr_cnt = c;
399
400         /* Configure driver only if associated */
401         if (ifmgd->associated) {
402                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
403                 ieee80211_bss_info_change_notify(sdata,
404                                                  BSS_CHANGED_ARP_FILTER);
405         }
406
407         mutex_unlock(&ifmgd->mtx);
408
409         return NOTIFY_DONE;
410 }
411 #endif
412
413 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
414 {
415         struct ieee80211_local *local =
416                 container_of(napi, struct ieee80211_local, napi);
417
418         return local->ops->napi_poll(&local->hw, budget);
419 }
420
421 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
422 {
423         struct ieee80211_local *local = hw_to_local(hw);
424
425         napi_schedule(&local->napi);
426 }
427 EXPORT_SYMBOL(ieee80211_napi_schedule);
428
429 void ieee80211_napi_complete(struct ieee80211_hw *hw)
430 {
431         struct ieee80211_local *local = hw_to_local(hw);
432
433         napi_complete(&local->napi);
434 }
435 EXPORT_SYMBOL(ieee80211_napi_complete);
436
437 /* There isn't a lot of sense in it, but you can transmit anything you like */
438 static const struct ieee80211_txrx_stypes
439 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
440         [NL80211_IFTYPE_ADHOC] = {
441                 .tx = 0xffff,
442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
443         },
444         [NL80211_IFTYPE_STATION] = {
445                 .tx = 0xffff,
446                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
447                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
448         },
449         [NL80211_IFTYPE_AP] = {
450                 .tx = 0xffff,
451                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
452                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
453                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
454                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
456                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
457                         BIT(IEEE80211_STYPE_ACTION >> 4),
458         },
459         [NL80211_IFTYPE_AP_VLAN] = {
460                 /* copy AP */
461                 .tx = 0xffff,
462                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
463                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
464                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
465                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
466                         BIT(IEEE80211_STYPE_AUTH >> 4) |
467                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
468                         BIT(IEEE80211_STYPE_ACTION >> 4),
469         },
470         [NL80211_IFTYPE_P2P_CLIENT] = {
471                 .tx = 0xffff,
472                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
474         },
475         [NL80211_IFTYPE_P2P_GO] = {
476                 .tx = 0xffff,
477                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
478                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
479                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
480                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
481                         BIT(IEEE80211_STYPE_AUTH >> 4) |
482                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
483                         BIT(IEEE80211_STYPE_ACTION >> 4),
484         },
485 };
486
487 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
488                                         const struct ieee80211_ops *ops)
489 {
490         struct ieee80211_local *local;
491         int priv_size, i;
492         struct wiphy *wiphy;
493
494         /* Ensure 32-byte alignment of our private data and hw private data.
495          * We use the wiphy priv data for both our ieee80211_local and for
496          * the driver's private data
497          *
498          * In memory it'll be like this:
499          *
500          * +-------------------------+
501          * | struct wiphy           |
502          * +-------------------------+
503          * | struct ieee80211_local  |
504          * +-------------------------+
505          * | driver's private data   |
506          * +-------------------------+
507          *
508          */
509         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
510
511         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
512
513         if (!wiphy)
514                 return NULL;
515
516         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
517
518         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
519                         WIPHY_FLAG_4ADDR_AP |
520                         WIPHY_FLAG_4ADDR_STATION;
521         wiphy->privid = mac80211_wiphy_privid;
522
523         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
524
525         local = wiphy_priv(wiphy);
526
527         local->hw.wiphy = wiphy;
528
529         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
530
531         BUG_ON(!ops->tx);
532         BUG_ON(!ops->start);
533         BUG_ON(!ops->stop);
534         BUG_ON(!ops->config);
535         BUG_ON(!ops->add_interface);
536         BUG_ON(!ops->remove_interface);
537         BUG_ON(!ops->configure_filter);
538         local->ops = ops;
539
540         /* set up some defaults */
541         local->hw.queues = 1;
542         local->hw.max_rates = 1;
543         local->hw.max_report_rates = 0;
544         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
545         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
546         local->user_power_level = -1;
547         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
548         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
549
550         INIT_LIST_HEAD(&local->interfaces);
551
552         __hw_addr_init(&local->mc_list);
553
554         mutex_init(&local->iflist_mtx);
555         mutex_init(&local->mtx);
556
557         mutex_init(&local->key_mtx);
558         spin_lock_init(&local->filter_lock);
559         spin_lock_init(&local->queue_stop_reason_lock);
560
561         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
562
563         ieee80211_work_init(local);
564
565         INIT_WORK(&local->restart_work, ieee80211_restart_work);
566
567         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
568         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
569         local->smps_mode = IEEE80211_SMPS_OFF;
570
571         INIT_WORK(&local->dynamic_ps_enable_work,
572                   ieee80211_dynamic_ps_enable_work);
573         INIT_WORK(&local->dynamic_ps_disable_work,
574                   ieee80211_dynamic_ps_disable_work);
575         setup_timer(&local->dynamic_ps_timer,
576                     ieee80211_dynamic_ps_timer, (unsigned long) local);
577
578         sta_info_init(local);
579
580         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
581                 skb_queue_head_init(&local->pending[i]);
582                 atomic_set(&local->agg_queue_stop[i], 0);
583         }
584         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
585                      (unsigned long)local);
586
587         tasklet_init(&local->tasklet,
588                      ieee80211_tasklet_handler,
589                      (unsigned long) local);
590
591         skb_queue_head_init(&local->skb_queue);
592         skb_queue_head_init(&local->skb_queue_unreliable);
593
594         /* init dummy netdev for use w/ NAPI */
595         init_dummy_netdev(&local->napi_dev);
596
597         return local_to_hw(local);
598 }
599 EXPORT_SYMBOL(ieee80211_alloc_hw);
600
601 int ieee80211_register_hw(struct ieee80211_hw *hw)
602 {
603         struct ieee80211_local *local = hw_to_local(hw);
604         int result;
605         enum ieee80211_band band;
606         int channels, max_bitrates;
607         bool supp_ht;
608         static const u32 cipher_suites[] = {
609                 /* keep WEP first, it may be removed below */
610                 WLAN_CIPHER_SUITE_WEP40,
611                 WLAN_CIPHER_SUITE_WEP104,
612                 WLAN_CIPHER_SUITE_TKIP,
613                 WLAN_CIPHER_SUITE_CCMP,
614
615                 /* keep last -- depends on hw flags! */
616                 WLAN_CIPHER_SUITE_AES_CMAC
617         };
618
619         if (hw->max_report_rates == 0)
620                 hw->max_report_rates = hw->max_rates;
621
622         /*
623          * generic code guarantees at least one band,
624          * set this very early because much code assumes
625          * that hw.conf.channel is assigned
626          */
627         channels = 0;
628         max_bitrates = 0;
629         supp_ht = false;
630         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
631                 struct ieee80211_supported_band *sband;
632
633                 sband = local->hw.wiphy->bands[band];
634                 if (!sband)
635                         continue;
636                 if (!local->oper_channel) {
637                         /* init channel we're on */
638                         local->hw.conf.channel =
639                         local->oper_channel = &sband->channels[0];
640                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
641                 }
642                 channels += sband->n_channels;
643
644                 if (max_bitrates < sband->n_bitrates)
645                         max_bitrates = sband->n_bitrates;
646                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
647         }
648
649         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
650                                       sizeof(void *) * channels, GFP_KERNEL);
651         if (!local->int_scan_req)
652                 return -ENOMEM;
653
654         /* if low-level driver supports AP, we also support VLAN */
655         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
656                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
657
658         /* mac80211 always supports monitor */
659         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
660
661 #ifndef CONFIG_MAC80211_MESH
662         /* mesh depends on Kconfig, but drivers should set it if they want */
663         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
664 #endif
665
666         /* mac80211 supports control port protocol changing */
667         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
668
669         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
670                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
671         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
672                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
673
674         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
675              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
676              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
677
678         /*
679          * Calculate scan IE length -- we need this to alloc
680          * memory and to subtract from the driver limit. It
681          * includes the DS Params, (extended) supported rates, and HT
682          * information -- SSID is the driver's responsibility.
683          */
684         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
685                 3 /* DS Params */;
686         if (supp_ht)
687                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
688
689         if (!local->ops->hw_scan) {
690                 /* For hw_scan, driver needs to set these up. */
691                 local->hw.wiphy->max_scan_ssids = 4;
692                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
693         }
694
695         /*
696          * If the driver supports any scan IEs, then assume the
697          * limit includes the IEs mac80211 will add, otherwise
698          * leave it at zero and let the driver sort it out; we
699          * still pass our IEs to the driver but userspace will
700          * not be allowed to in that case.
701          */
702         if (local->hw.wiphy->max_scan_ie_len)
703                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
704
705         /* Set up cipher suites unless driver already did */
706         if (!local->hw.wiphy->cipher_suites) {
707                 local->hw.wiphy->cipher_suites = cipher_suites;
708                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
709                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
710                         local->hw.wiphy->n_cipher_suites--;
711         }
712         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
713                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
714                         local->hw.wiphy->cipher_suites += 2;
715                         local->hw.wiphy->n_cipher_suites -= 2;
716                 } else {
717                         u32 *suites;
718                         int r, w = 0;
719
720                         /* Filter out WEP */
721
722                         suites = kmemdup(
723                                 local->hw.wiphy->cipher_suites,
724                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
725                                 GFP_KERNEL);
726                         if (!suites)
727                                 return -ENOMEM;
728                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
729                                 u32 suite = local->hw.wiphy->cipher_suites[r];
730                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
731                                     suite == WLAN_CIPHER_SUITE_WEP104)
732                                         continue;
733                                 suites[w++] = suite;
734                         }
735                         local->hw.wiphy->cipher_suites = suites;
736                         local->hw.wiphy->n_cipher_suites = w;
737                         local->wiphy_ciphers_allocated = true;
738                 }
739         }
740
741         result = wiphy_register(local->hw.wiphy);
742         if (result < 0)
743                 goto fail_wiphy_register;
744
745         /*
746          * We use the number of queues for feature tests (QoS, HT) internally
747          * so restrict them appropriately.
748          */
749         if (hw->queues > IEEE80211_MAX_QUEUES)
750                 hw->queues = IEEE80211_MAX_QUEUES;
751
752         local->workqueue =
753                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
754         if (!local->workqueue) {
755                 result = -ENOMEM;
756                 goto fail_workqueue;
757         }
758
759         /*
760          * The hardware needs headroom for sending the frame,
761          * and we need some headroom for passing the frame to monitor
762          * interfaces, but never both at the same time.
763          */
764         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
765                         sizeof(struct ieee80211_tx_status_rtap_hdr));
766         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
767                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
768
769         debugfs_hw_add(local);
770
771         /*
772          * if the driver doesn't specify a max listen interval we
773          * use 5 which should be a safe default
774          */
775         if (local->hw.max_listen_interval == 0)
776                 local->hw.max_listen_interval = 5;
777
778         local->hw.conf.listen_interval = local->hw.max_listen_interval;
779
780         local->dynamic_ps_forced_timeout = -1;
781
782         result = sta_info_start(local);
783         if (result < 0)
784                 goto fail_sta_info;
785
786         result = ieee80211_wep_init(local);
787         if (result < 0)
788                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
789                             result);
790
791         rtnl_lock();
792
793         result = ieee80211_init_rate_ctrl_alg(local,
794                                               hw->rate_control_algorithm);
795         if (result < 0) {
796                 wiphy_debug(local->hw.wiphy,
797                             "Failed to initialize rate control algorithm\n");
798                 goto fail_rate;
799         }
800
801         /* add one default STA interface if supported */
802         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
803                 result = ieee80211_if_add(local, "wlan%d", NULL,
804                                           NL80211_IFTYPE_STATION, NULL);
805                 if (result)
806                         wiphy_warn(local->hw.wiphy,
807                                    "Failed to add default virtual iface\n");
808         }
809
810         rtnl_unlock();
811
812         ieee80211_led_init(local);
813
814         local->network_latency_notifier.notifier_call =
815                 ieee80211_max_network_latency;
816         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
817                                      &local->network_latency_notifier);
818         if (result) {
819                 rtnl_lock();
820                 goto fail_pm_qos;
821         }
822
823 #ifdef CONFIG_INET
824         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
825         result = register_inetaddr_notifier(&local->ifa_notifier);
826         if (result)
827                 goto fail_ifa;
828 #endif
829
830         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
831                         local->hw.napi_weight);
832
833         return 0;
834
835 #ifdef CONFIG_INET
836  fail_ifa:
837         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
838                                &local->network_latency_notifier);
839         rtnl_lock();
840 #endif
841  fail_pm_qos:
842         ieee80211_led_exit(local);
843         ieee80211_remove_interfaces(local);
844  fail_rate:
845         rtnl_unlock();
846         ieee80211_wep_free(local);
847         sta_info_stop(local);
848  fail_sta_info:
849         destroy_workqueue(local->workqueue);
850  fail_workqueue:
851         wiphy_unregister(local->hw.wiphy);
852  fail_wiphy_register:
853         if (local->wiphy_ciphers_allocated)
854                 kfree(local->hw.wiphy->cipher_suites);
855         kfree(local->int_scan_req);
856         return result;
857 }
858 EXPORT_SYMBOL(ieee80211_register_hw);
859
860 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
861 {
862         struct ieee80211_local *local = hw_to_local(hw);
863
864         tasklet_kill(&local->tx_pending_tasklet);
865         tasklet_kill(&local->tasklet);
866
867         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
868                                &local->network_latency_notifier);
869 #ifdef CONFIG_INET
870         unregister_inetaddr_notifier(&local->ifa_notifier);
871 #endif
872
873         rtnl_lock();
874
875         /*
876          * At this point, interface list manipulations are fine
877          * because the driver cannot be handing us frames any
878          * more and the tasklet is killed.
879          */
880         ieee80211_remove_interfaces(local);
881
882         rtnl_unlock();
883
884         /*
885          * Now all work items will be gone, but the
886          * timer might still be armed, so delete it
887          */
888         del_timer_sync(&local->work_timer);
889
890         cancel_work_sync(&local->restart_work);
891         cancel_work_sync(&local->reconfig_filter);
892
893         ieee80211_clear_tx_pending(local);
894         sta_info_stop(local);
895         rate_control_deinitialize(local);
896
897         if (skb_queue_len(&local->skb_queue) ||
898             skb_queue_len(&local->skb_queue_unreliable))
899                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
900         skb_queue_purge(&local->skb_queue);
901         skb_queue_purge(&local->skb_queue_unreliable);
902
903         destroy_workqueue(local->workqueue);
904         wiphy_unregister(local->hw.wiphy);
905         ieee80211_wep_free(local);
906         ieee80211_led_exit(local);
907         kfree(local->int_scan_req);
908 }
909 EXPORT_SYMBOL(ieee80211_unregister_hw);
910
911 void ieee80211_free_hw(struct ieee80211_hw *hw)
912 {
913         struct ieee80211_local *local = hw_to_local(hw);
914
915         mutex_destroy(&local->iflist_mtx);
916         mutex_destroy(&local->mtx);
917
918         if (local->wiphy_ciphers_allocated)
919                 kfree(local->hw.wiphy->cipher_suites);
920
921         wiphy_free(local->hw.wiphy);
922 }
923 EXPORT_SYMBOL(ieee80211_free_hw);
924
925 static int __init ieee80211_init(void)
926 {
927         struct sk_buff *skb;
928         int ret;
929
930         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
931         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
932                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
933
934         ret = rc80211_minstrel_init();
935         if (ret)
936                 return ret;
937
938         ret = rc80211_minstrel_ht_init();
939         if (ret)
940                 goto err_minstrel;
941
942         ret = rc80211_pid_init();
943         if (ret)
944                 goto err_pid;
945
946         ret = ieee80211_iface_init();
947         if (ret)
948                 goto err_netdev;
949
950         return 0;
951  err_netdev:
952         rc80211_pid_exit();
953  err_pid:
954         rc80211_minstrel_ht_exit();
955  err_minstrel:
956         rc80211_minstrel_exit();
957
958         return ret;
959 }
960
961 static void __exit ieee80211_exit(void)
962 {
963         rc80211_pid_exit();
964         rc80211_minstrel_ht_exit();
965         rc80211_minstrel_exit();
966
967         if (mesh_allocated)
968                 ieee80211s_stop();
969
970         ieee80211_iface_exit();
971 }
972
973
974 subsys_initcall(ieee80211_init);
975 module_exit(ieee80211_exit);
976
977 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
978 MODULE_LICENSE("GPL");