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