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