973fee9f7d69dff18a6ef3eb0b24c2cd199bebad
[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 #ifdef CONFIG_MAC80211_MESH
249                         case NL80211_IFTYPE_MESH_POINT:
250                                 sdata->vif.bss_conf.enable_beacon =
251                                         !!sdata->u.mesh.mesh_id_len;
252                                 break;
253 #endif
254                         default:
255                                 /* not reached */
256                                 WARN_ON(1);
257                                 break;
258                         }
259                 }
260         }
261
262         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
263 }
264
265 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
266 {
267         sdata->vif.bss_conf.use_cts_prot = false;
268         sdata->vif.bss_conf.use_short_preamble = false;
269         sdata->vif.bss_conf.use_short_slot = false;
270         return BSS_CHANGED_ERP_CTS_PROT |
271                BSS_CHANGED_ERP_PREAMBLE |
272                BSS_CHANGED_ERP_SLOT;
273 }
274
275 static void ieee80211_tasklet_handler(unsigned long data)
276 {
277         struct ieee80211_local *local = (struct ieee80211_local *) data;
278         struct sk_buff *skb;
279
280         while ((skb = skb_dequeue(&local->skb_queue)) ||
281                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
282                 switch (skb->pkt_type) {
283                 case IEEE80211_RX_MSG:
284                         /* Clear skb->pkt_type in order to not confuse kernel
285                          * netstack. */
286                         skb->pkt_type = 0;
287                         ieee80211_rx(local_to_hw(local), skb);
288                         break;
289                 case IEEE80211_TX_STATUS_MSG:
290                         skb->pkt_type = 0;
291                         ieee80211_tx_status(local_to_hw(local), skb);
292                         break;
293                 default:
294                         WARN(1, "mac80211: Packet is of unknown type %d\n",
295                              skb->pkt_type);
296                         dev_kfree_skb(skb);
297                         break;
298                 }
299         }
300 }
301
302 static void ieee80211_restart_work(struct work_struct *work)
303 {
304         struct ieee80211_local *local =
305                 container_of(work, struct ieee80211_local, restart_work);
306
307         /* wait for scan work complete */
308         flush_workqueue(local->workqueue);
309
310         mutex_lock(&local->mtx);
311         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
312                 "%s called with hardware scan in progress\n", __func__);
313         mutex_unlock(&local->mtx);
314
315         rtnl_lock();
316         ieee80211_scan_cancel(local);
317         ieee80211_reconfig(local);
318         rtnl_unlock();
319 }
320
321 void ieee80211_restart_hw(struct ieee80211_hw *hw)
322 {
323         struct ieee80211_local *local = hw_to_local(hw);
324
325         trace_api_restart_hw(local);
326
327         /* use this reason, ieee80211_reconfig will unblock it */
328         ieee80211_stop_queues_by_reason(hw,
329                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
330
331         schedule_work(&local->restart_work);
332 }
333 EXPORT_SYMBOL(ieee80211_restart_hw);
334
335 static void ieee80211_recalc_smps_work(struct work_struct *work)
336 {
337         struct ieee80211_local *local =
338                 container_of(work, struct ieee80211_local, recalc_smps);
339
340         mutex_lock(&local->iflist_mtx);
341         ieee80211_recalc_smps(local);
342         mutex_unlock(&local->iflist_mtx);
343 }
344
345 #ifdef CONFIG_INET
346 static int ieee80211_ifa_changed(struct notifier_block *nb,
347                                  unsigned long data, void *arg)
348 {
349         struct in_ifaddr *ifa = arg;
350         struct ieee80211_local *local =
351                 container_of(nb, struct ieee80211_local,
352                              ifa_notifier);
353         struct net_device *ndev = ifa->ifa_dev->dev;
354         struct wireless_dev *wdev = ndev->ieee80211_ptr;
355         struct in_device *idev;
356         struct ieee80211_sub_if_data *sdata;
357         struct ieee80211_bss_conf *bss_conf;
358         struct ieee80211_if_managed *ifmgd;
359         int c = 0;
360
361         /* Make sure it's our interface that got changed */
362         if (!wdev)
363                 return NOTIFY_DONE;
364
365         if (wdev->wiphy != local->hw.wiphy)
366                 return NOTIFY_DONE;
367
368         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
369         bss_conf = &sdata->vif.bss_conf;
370
371         if (!ieee80211_sdata_running(sdata))
372                 return NOTIFY_DONE;
373
374         /* ARP filtering is only supported in managed mode */
375         if (sdata->vif.type != NL80211_IFTYPE_STATION)
376                 return NOTIFY_DONE;
377
378         idev = __in_dev_get_rtnl(sdata->dev);
379         if (!idev)
380                 return NOTIFY_DONE;
381
382         ifmgd = &sdata->u.mgd;
383         mutex_lock(&ifmgd->mtx);
384
385         /* Copy the addresses to the bss_conf list */
386         ifa = idev->ifa_list;
387         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
388                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
389                 ifa = ifa->ifa_next;
390                 c++;
391         }
392
393         /* If not all addresses fit the list, disable filtering */
394         if (ifa) {
395                 sdata->arp_filter_state = false;
396                 c = 0;
397         } else {
398                 sdata->arp_filter_state = true;
399         }
400         bss_conf->arp_addr_cnt = c;
401
402         /* Configure driver only if associated */
403         if (ifmgd->associated) {
404                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
405                 ieee80211_bss_info_change_notify(sdata,
406                                                  BSS_CHANGED_ARP_FILTER);
407         }
408
409         mutex_unlock(&ifmgd->mtx);
410
411         return NOTIFY_DONE;
412 }
413 #endif
414
415 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
416 {
417         struct ieee80211_local *local =
418                 container_of(napi, struct ieee80211_local, napi);
419
420         return local->ops->napi_poll(&local->hw, budget);
421 }
422
423 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
424 {
425         struct ieee80211_local *local = hw_to_local(hw);
426
427         napi_schedule(&local->napi);
428 }
429 EXPORT_SYMBOL(ieee80211_napi_schedule);
430
431 void ieee80211_napi_complete(struct ieee80211_hw *hw)
432 {
433         struct ieee80211_local *local = hw_to_local(hw);
434
435         napi_complete(&local->napi);
436 }
437 EXPORT_SYMBOL(ieee80211_napi_complete);
438
439 /* There isn't a lot of sense in it, but you can transmit anything you like */
440 static const struct ieee80211_txrx_stypes
441 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
442         [NL80211_IFTYPE_ADHOC] = {
443                 .tx = 0xffff,
444                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
445         },
446         [NL80211_IFTYPE_STATION] = {
447                 .tx = 0xffff,
448                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
450         },
451         [NL80211_IFTYPE_AP] = {
452                 .tx = 0xffff,
453                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
454                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
455                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
456                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
457                         BIT(IEEE80211_STYPE_AUTH >> 4) |
458                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
459                         BIT(IEEE80211_STYPE_ACTION >> 4),
460         },
461         [NL80211_IFTYPE_AP_VLAN] = {
462                 /* copy AP */
463                 .tx = 0xffff,
464                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
465                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
466                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
467                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
468                         BIT(IEEE80211_STYPE_AUTH >> 4) |
469                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
470                         BIT(IEEE80211_STYPE_ACTION >> 4),
471         },
472         [NL80211_IFTYPE_P2P_CLIENT] = {
473                 .tx = 0xffff,
474                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
475                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
476         },
477         [NL80211_IFTYPE_P2P_GO] = {
478                 .tx = 0xffff,
479                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
480                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
481                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
482                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
483                         BIT(IEEE80211_STYPE_AUTH >> 4) |
484                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
485                         BIT(IEEE80211_STYPE_ACTION >> 4),
486         },
487 };
488
489 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
490                                         const struct ieee80211_ops *ops)
491 {
492         struct ieee80211_local *local;
493         int priv_size, i;
494         struct wiphy *wiphy;
495
496         /* Ensure 32-byte alignment of our private data and hw private data.
497          * We use the wiphy priv data for both our ieee80211_local and for
498          * the driver's private data
499          *
500          * In memory it'll be like this:
501          *
502          * +-------------------------+
503          * | struct wiphy           |
504          * +-------------------------+
505          * | struct ieee80211_local  |
506          * +-------------------------+
507          * | driver's private data   |
508          * +-------------------------+
509          *
510          */
511         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
512
513         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
514
515         if (!wiphy)
516                 return NULL;
517
518         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
519
520         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
521                         WIPHY_FLAG_4ADDR_AP |
522                         WIPHY_FLAG_4ADDR_STATION;
523         wiphy->privid = mac80211_wiphy_privid;
524
525         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
526
527         local = wiphy_priv(wiphy);
528
529         local->hw.wiphy = wiphy;
530
531         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
532
533         BUG_ON(!ops->tx);
534         BUG_ON(!ops->start);
535         BUG_ON(!ops->stop);
536         BUG_ON(!ops->config);
537         BUG_ON(!ops->add_interface);
538         BUG_ON(!ops->remove_interface);
539         BUG_ON(!ops->configure_filter);
540         local->ops = ops;
541
542         /* set up some defaults */
543         local->hw.queues = 1;
544         local->hw.max_rates = 1;
545         local->hw.max_report_rates = 0;
546         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
547         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
548         local->user_power_level = -1;
549         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
550         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
551
552         INIT_LIST_HEAD(&local->interfaces);
553
554         __hw_addr_init(&local->mc_list);
555
556         mutex_init(&local->iflist_mtx);
557         mutex_init(&local->mtx);
558
559         mutex_init(&local->key_mtx);
560         spin_lock_init(&local->filter_lock);
561         spin_lock_init(&local->queue_stop_reason_lock);
562
563         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
564
565         ieee80211_work_init(local);
566
567         INIT_WORK(&local->restart_work, ieee80211_restart_work);
568
569         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
570         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
571         local->smps_mode = IEEE80211_SMPS_OFF;
572
573         INIT_WORK(&local->dynamic_ps_enable_work,
574                   ieee80211_dynamic_ps_enable_work);
575         INIT_WORK(&local->dynamic_ps_disable_work,
576                   ieee80211_dynamic_ps_disable_work);
577         setup_timer(&local->dynamic_ps_timer,
578                     ieee80211_dynamic_ps_timer, (unsigned long) local);
579
580         sta_info_init(local);
581
582         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
583                 skb_queue_head_init(&local->pending[i]);
584                 atomic_set(&local->agg_queue_stop[i], 0);
585         }
586         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
587                      (unsigned long)local);
588
589         tasklet_init(&local->tasklet,
590                      ieee80211_tasklet_handler,
591                      (unsigned long) local);
592
593         skb_queue_head_init(&local->skb_queue);
594         skb_queue_head_init(&local->skb_queue_unreliable);
595
596         /* init dummy netdev for use w/ NAPI */
597         init_dummy_netdev(&local->napi_dev);
598
599         return local_to_hw(local);
600 }
601 EXPORT_SYMBOL(ieee80211_alloc_hw);
602
603 int ieee80211_register_hw(struct ieee80211_hw *hw)
604 {
605         struct ieee80211_local *local = hw_to_local(hw);
606         int result;
607         enum ieee80211_band band;
608         int channels, max_bitrates;
609         bool supp_ht;
610         static const u32 cipher_suites[] = {
611                 /* keep WEP first, it may be removed below */
612                 WLAN_CIPHER_SUITE_WEP40,
613                 WLAN_CIPHER_SUITE_WEP104,
614                 WLAN_CIPHER_SUITE_TKIP,
615                 WLAN_CIPHER_SUITE_CCMP,
616
617                 /* keep last -- depends on hw flags! */
618                 WLAN_CIPHER_SUITE_AES_CMAC
619         };
620
621         if (hw->max_report_rates == 0)
622                 hw->max_report_rates = hw->max_rates;
623
624         /*
625          * generic code guarantees at least one band,
626          * set this very early because much code assumes
627          * that hw.conf.channel is assigned
628          */
629         channels = 0;
630         max_bitrates = 0;
631         supp_ht = false;
632         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
633                 struct ieee80211_supported_band *sband;
634
635                 sband = local->hw.wiphy->bands[band];
636                 if (!sband)
637                         continue;
638                 if (!local->oper_channel) {
639                         /* init channel we're on */
640                         local->hw.conf.channel =
641                         local->oper_channel = &sband->channels[0];
642                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
643                 }
644                 channels += sband->n_channels;
645
646                 if (max_bitrates < sband->n_bitrates)
647                         max_bitrates = sband->n_bitrates;
648                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
649         }
650
651         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
652                                       sizeof(void *) * channels, GFP_KERNEL);
653         if (!local->int_scan_req)
654                 return -ENOMEM;
655
656         /* if low-level driver supports AP, we also support VLAN */
657         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
658                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
659
660         /* mac80211 always supports monitor */
661         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
662
663 #ifndef CONFIG_MAC80211_MESH
664         /* mesh depends on Kconfig, but drivers should set it if they want */
665         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
666 #endif
667
668         /* mac80211 supports control port protocol changing */
669         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
670
671         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
672                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
673         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
674                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
675
676         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
677              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
678              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
679
680         /*
681          * Calculate scan IE length -- we need this to alloc
682          * memory and to subtract from the driver limit. It
683          * includes the DS Params, (extended) supported rates, and HT
684          * information -- SSID is the driver's responsibility.
685          */
686         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
687                 3 /* DS Params */;
688         if (supp_ht)
689                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
690
691         if (!local->ops->hw_scan) {
692                 /* For hw_scan, driver needs to set these up. */
693                 local->hw.wiphy->max_scan_ssids = 4;
694                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
695         }
696
697         /*
698          * If the driver supports any scan IEs, then assume the
699          * limit includes the IEs mac80211 will add, otherwise
700          * leave it at zero and let the driver sort it out; we
701          * still pass our IEs to the driver but userspace will
702          * not be allowed to in that case.
703          */
704         if (local->hw.wiphy->max_scan_ie_len)
705                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
706
707         /* Set up cipher suites unless driver already did */
708         if (!local->hw.wiphy->cipher_suites) {
709                 local->hw.wiphy->cipher_suites = cipher_suites;
710                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
711                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
712                         local->hw.wiphy->n_cipher_suites--;
713         }
714         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
715                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
716                         local->hw.wiphy->cipher_suites += 2;
717                         local->hw.wiphy->n_cipher_suites -= 2;
718                 } else {
719                         u32 *suites;
720                         int r, w = 0;
721
722                         /* Filter out WEP */
723
724                         suites = kmemdup(
725                                 local->hw.wiphy->cipher_suites,
726                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
727                                 GFP_KERNEL);
728                         if (!suites)
729                                 return -ENOMEM;
730                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
731                                 u32 suite = local->hw.wiphy->cipher_suites[r];
732                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
733                                     suite == WLAN_CIPHER_SUITE_WEP104)
734                                         continue;
735                                 suites[w++] = suite;
736                         }
737                         local->hw.wiphy->cipher_suites = suites;
738                         local->hw.wiphy->n_cipher_suites = w;
739                         local->wiphy_ciphers_allocated = true;
740                 }
741         }
742
743         result = wiphy_register(local->hw.wiphy);
744         if (result < 0)
745                 goto fail_wiphy_register;
746
747         /*
748          * We use the number of queues for feature tests (QoS, HT) internally
749          * so restrict them appropriately.
750          */
751         if (hw->queues > IEEE80211_MAX_QUEUES)
752                 hw->queues = IEEE80211_MAX_QUEUES;
753
754         local->workqueue =
755                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
756         if (!local->workqueue) {
757                 result = -ENOMEM;
758                 goto fail_workqueue;
759         }
760
761         /*
762          * The hardware needs headroom for sending the frame,
763          * and we need some headroom for passing the frame to monitor
764          * interfaces, but never both at the same time.
765          */
766         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
767                         sizeof(struct ieee80211_tx_status_rtap_hdr));
768         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
769                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
770
771         debugfs_hw_add(local);
772
773         /*
774          * if the driver doesn't specify a max listen interval we
775          * use 5 which should be a safe default
776          */
777         if (local->hw.max_listen_interval == 0)
778                 local->hw.max_listen_interval = 5;
779
780         local->hw.conf.listen_interval = local->hw.max_listen_interval;
781
782         local->dynamic_ps_forced_timeout = -1;
783
784         result = sta_info_start(local);
785         if (result < 0)
786                 goto fail_sta_info;
787
788         result = ieee80211_wep_init(local);
789         if (result < 0)
790                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
791                             result);
792
793         rtnl_lock();
794
795         result = ieee80211_init_rate_ctrl_alg(local,
796                                               hw->rate_control_algorithm);
797         if (result < 0) {
798                 wiphy_debug(local->hw.wiphy,
799                             "Failed to initialize rate control algorithm\n");
800                 goto fail_rate;
801         }
802
803         /* add one default STA interface if supported */
804         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
805                 result = ieee80211_if_add(local, "wlan%d", NULL,
806                                           NL80211_IFTYPE_STATION, NULL);
807                 if (result)
808                         wiphy_warn(local->hw.wiphy,
809                                    "Failed to add default virtual iface\n");
810         }
811
812         rtnl_unlock();
813
814         ieee80211_led_init(local);
815
816         local->network_latency_notifier.notifier_call =
817                 ieee80211_max_network_latency;
818         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
819                                      &local->network_latency_notifier);
820         if (result) {
821                 rtnl_lock();
822                 goto fail_pm_qos;
823         }
824
825 #ifdef CONFIG_INET
826         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
827         result = register_inetaddr_notifier(&local->ifa_notifier);
828         if (result)
829                 goto fail_ifa;
830 #endif
831
832         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
833                         local->hw.napi_weight);
834
835         return 0;
836
837 #ifdef CONFIG_INET
838  fail_ifa:
839         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
840                                &local->network_latency_notifier);
841         rtnl_lock();
842 #endif
843  fail_pm_qos:
844         ieee80211_led_exit(local);
845         ieee80211_remove_interfaces(local);
846  fail_rate:
847         rtnl_unlock();
848         ieee80211_wep_free(local);
849         sta_info_stop(local);
850  fail_sta_info:
851         destroy_workqueue(local->workqueue);
852  fail_workqueue:
853         wiphy_unregister(local->hw.wiphy);
854  fail_wiphy_register:
855         if (local->wiphy_ciphers_allocated)
856                 kfree(local->hw.wiphy->cipher_suites);
857         kfree(local->int_scan_req);
858         return result;
859 }
860 EXPORT_SYMBOL(ieee80211_register_hw);
861
862 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
863 {
864         struct ieee80211_local *local = hw_to_local(hw);
865
866         tasklet_kill(&local->tx_pending_tasklet);
867         tasklet_kill(&local->tasklet);
868
869         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
870                                &local->network_latency_notifier);
871 #ifdef CONFIG_INET
872         unregister_inetaddr_notifier(&local->ifa_notifier);
873 #endif
874
875         rtnl_lock();
876
877         /*
878          * At this point, interface list manipulations are fine
879          * because the driver cannot be handing us frames any
880          * more and the tasklet is killed.
881          */
882         ieee80211_remove_interfaces(local);
883
884         rtnl_unlock();
885
886         /*
887          * Now all work items will be gone, but the
888          * timer might still be armed, so delete it
889          */
890         del_timer_sync(&local->work_timer);
891
892         cancel_work_sync(&local->restart_work);
893         cancel_work_sync(&local->reconfig_filter);
894
895         ieee80211_clear_tx_pending(local);
896         sta_info_stop(local);
897         rate_control_deinitialize(local);
898
899         if (skb_queue_len(&local->skb_queue) ||
900             skb_queue_len(&local->skb_queue_unreliable))
901                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
902         skb_queue_purge(&local->skb_queue);
903         skb_queue_purge(&local->skb_queue_unreliable);
904
905         destroy_workqueue(local->workqueue);
906         wiphy_unregister(local->hw.wiphy);
907         ieee80211_wep_free(local);
908         ieee80211_led_exit(local);
909         kfree(local->int_scan_req);
910 }
911 EXPORT_SYMBOL(ieee80211_unregister_hw);
912
913 void ieee80211_free_hw(struct ieee80211_hw *hw)
914 {
915         struct ieee80211_local *local = hw_to_local(hw);
916
917         mutex_destroy(&local->iflist_mtx);
918         mutex_destroy(&local->mtx);
919
920         if (local->wiphy_ciphers_allocated)
921                 kfree(local->hw.wiphy->cipher_suites);
922
923         wiphy_free(local->hw.wiphy);
924 }
925 EXPORT_SYMBOL(ieee80211_free_hw);
926
927 static int __init ieee80211_init(void)
928 {
929         struct sk_buff *skb;
930         int ret;
931
932         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
933         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
934                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
935
936         ret = rc80211_minstrel_init();
937         if (ret)
938                 return ret;
939
940         ret = rc80211_minstrel_ht_init();
941         if (ret)
942                 goto err_minstrel;
943
944         ret = rc80211_pid_init();
945         if (ret)
946                 goto err_pid;
947
948         ret = ieee80211_iface_init();
949         if (ret)
950                 goto err_netdev;
951
952         return 0;
953  err_netdev:
954         rc80211_pid_exit();
955  err_pid:
956         rc80211_minstrel_ht_exit();
957  err_minstrel:
958         rc80211_minstrel_exit();
959
960         return ret;
961 }
962
963 static void __exit ieee80211_exit(void)
964 {
965         rc80211_pid_exit();
966         rc80211_minstrel_ht_exit();
967         rc80211_minstrel_exit();
968
969         if (mesh_allocated)
970                 ieee80211s_stop();
971
972         ieee80211_iface_exit();
973 }
974
975
976 subsys_initcall(ieee80211_init);
977 module_exit(ieee80211_exit);
978
979 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
980 MODULE_LICENSE("GPL");