mac80211: distinct between max rates and the number of rates the hw can report
[linux-2.6.git] / net / mac80211 / main.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <net/mac80211.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/if_arp.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos_params.h>
23 #include <linux/inetdevice.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wep.h"
32 #include "led.h"
33 #include "cfg.h"
34 #include "debugfs.h"
35
36
37 bool ieee80211_disable_40mhz_24ghz;
38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
40                  "Disable 40MHz support in the 2.4GHz band");
41
42 void ieee80211_configure_filter(struct ieee80211_local *local)
43 {
44         u64 mc;
45         unsigned int changed_flags;
46         unsigned int new_flags = 0;
47
48         if (atomic_read(&local->iff_promiscs))
49                 new_flags |= FIF_PROMISC_IN_BSS;
50
51         if (atomic_read(&local->iff_allmultis))
52                 new_flags |= FIF_ALLMULTI;
53
54         if (local->monitors || local->scanning)
55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
56
57         if (local->fif_fcsfail)
58                 new_flags |= FIF_FCSFAIL;
59
60         if (local->fif_plcpfail)
61                 new_flags |= FIF_PLCPFAIL;
62
63         if (local->fif_control)
64                 new_flags |= FIF_CONTROL;
65
66         if (local->fif_other_bss)
67                 new_flags |= FIF_OTHER_BSS;
68
69         if (local->fif_pspoll)
70                 new_flags |= FIF_PSPOLL;
71
72         spin_lock_bh(&local->filter_lock);
73         changed_flags = local->filter_flags ^ new_flags;
74
75         mc = drv_prepare_multicast(local, &local->mc_list);
76         spin_unlock_bh(&local->filter_lock);
77
78         /* be a bit nasty */
79         new_flags |= (1<<31);
80
81         drv_configure_filter(local, changed_flags, &new_flags, mc);
82
83         WARN_ON(new_flags & (1<<31));
84
85         local->filter_flags = new_flags & ~(1<<31);
86 }
87
88 static void ieee80211_reconfig_filter(struct work_struct *work)
89 {
90         struct ieee80211_local *local =
91                 container_of(work, struct ieee80211_local, reconfig_filter);
92
93         ieee80211_configure_filter(local);
94 }
95
96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
97 {
98         struct ieee80211_channel *chan, *scan_chan;
99         int ret = 0;
100         int power;
101         enum nl80211_channel_type channel_type;
102         u32 offchannel_flag;
103
104         might_sleep();
105
106         scan_chan = local->scan_channel;
107
108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
109         if (scan_chan) {
110                 chan = scan_chan;
111                 channel_type = NL80211_CHAN_NO_HT;
112                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
113         } else if (local->tmp_channel &&
114                    local->oper_channel != local->tmp_channel) {
115                 chan = scan_chan = local->tmp_channel;
116                 channel_type = local->tmp_channel_type;
117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
118         } else {
119                 chan = local->oper_channel;
120                 channel_type = local->_oper_channel_type;
121                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
122         }
123         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
124
125         if (offchannel_flag || chan != local->hw.conf.channel ||
126             channel_type != local->hw.conf.channel_type) {
127                 local->hw.conf.channel = chan;
128                 local->hw.conf.channel_type = channel_type;
129                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
130         }
131
132         if (!conf_is_ht(&local->hw.conf)) {
133                 /*
134                  * mac80211.h documents that this is only valid
135                  * when the channel is set to an HT type, and
136                  * that otherwise STATIC is used.
137                  */
138                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
139         } else if (local->hw.conf.smps_mode != local->smps_mode) {
140                 local->hw.conf.smps_mode = local->smps_mode;
141                 changed |= IEEE80211_CONF_CHANGE_SMPS;
142         }
143
144         if (scan_chan)
145                 power = chan->max_power;
146         else
147                 power = local->power_constr_level ?
148                         (chan->max_power - local->power_constr_level) :
149                         chan->max_power;
150
151         if (local->user_power_level >= 0)
152                 power = min(power, local->user_power_level);
153
154         if (local->hw.conf.power_level != power) {
155                 changed |= IEEE80211_CONF_CHANGE_POWER;
156                 local->hw.conf.power_level = power;
157         }
158
159         if (changed && local->open_count) {
160                 ret = drv_config(local, changed);
161                 /*
162                  * Goal:
163                  * HW reconfiguration should never fail, the driver has told
164                  * us what it can support so it should live up to that promise.
165                  *
166                  * Current status:
167                  * rfkill is not integrated with mac80211 and a
168                  * configuration command can thus fail if hardware rfkill
169                  * is enabled
170                  *
171                  * FIXME: integrate rfkill with mac80211 and then add this
172                  * WARN_ON() back
173                  *
174                  */
175                 /* WARN_ON(ret); */
176         }
177
178         return ret;
179 }
180
181 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
182                                       u32 changed)
183 {
184         struct ieee80211_local *local = sdata->local;
185         static const u8 zero[ETH_ALEN] = { 0 };
186
187         if (!changed)
188                 return;
189
190         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
191                 /*
192                  * While not associated, claim a BSSID of all-zeroes
193                  * so that drivers don't do any weird things with the
194                  * BSSID at that time.
195                  */
196                 if (sdata->vif.bss_conf.assoc)
197                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
198                 else
199                         sdata->vif.bss_conf.bssid = zero;
200         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
201                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
202         else if (sdata->vif.type == NL80211_IFTYPE_AP)
203                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
204         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
205                 sdata->vif.bss_conf.bssid = NULL;
206         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
207                 sdata->vif.bss_conf.bssid = zero;
208         } else {
209                 WARN_ON(1);
210                 return;
211         }
212
213         switch (sdata->vif.type) {
214         case NL80211_IFTYPE_AP:
215         case NL80211_IFTYPE_ADHOC:
216         case NL80211_IFTYPE_WDS:
217         case NL80211_IFTYPE_MESH_POINT:
218                 break;
219         default:
220                 /* do not warn to simplify caller in scan.c */
221                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
222                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
223                         return;
224                 break;
225         }
226
227         if (changed & BSS_CHANGED_BEACON_ENABLED) {
228                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
229                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
230                         sdata->vif.bss_conf.enable_beacon = false;
231                 } else {
232                         /*
233                          * Beacon should be enabled, but AP mode must
234                          * check whether there is a beacon configured.
235                          */
236                         switch (sdata->vif.type) {
237                         case NL80211_IFTYPE_AP:
238                                 sdata->vif.bss_conf.enable_beacon =
239                                         !!sdata->u.ap.beacon;
240                                 break;
241                         case NL80211_IFTYPE_ADHOC:
242                                 sdata->vif.bss_conf.enable_beacon =
243                                         !!sdata->u.ibss.presp;
244                                 break;
245                         case NL80211_IFTYPE_MESH_POINT:
246                                 sdata->vif.bss_conf.enable_beacon = true;
247                                 break;
248                         default:
249                                 /* not reached */
250                                 WARN_ON(1);
251                                 break;
252                         }
253                 }
254         }
255
256         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
257 }
258
259 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
260 {
261         sdata->vif.bss_conf.use_cts_prot = false;
262         sdata->vif.bss_conf.use_short_preamble = false;
263         sdata->vif.bss_conf.use_short_slot = false;
264         return BSS_CHANGED_ERP_CTS_PROT |
265                BSS_CHANGED_ERP_PREAMBLE |
266                BSS_CHANGED_ERP_SLOT;
267 }
268
269 static void ieee80211_tasklet_handler(unsigned long data)
270 {
271         struct ieee80211_local *local = (struct ieee80211_local *) data;
272         struct sk_buff *skb;
273
274         while ((skb = skb_dequeue(&local->skb_queue)) ||
275                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
276                 switch (skb->pkt_type) {
277                 case IEEE80211_RX_MSG:
278                         /* Clear skb->pkt_type in order to not confuse kernel
279                          * netstack. */
280                         skb->pkt_type = 0;
281                         ieee80211_rx(local_to_hw(local), skb);
282                         break;
283                 case IEEE80211_TX_STATUS_MSG:
284                         skb->pkt_type = 0;
285                         ieee80211_tx_status(local_to_hw(local), skb);
286                         break;
287                 default:
288                         WARN(1, "mac80211: Packet is of unknown type %d\n",
289                              skb->pkt_type);
290                         dev_kfree_skb(skb);
291                         break;
292                 }
293         }
294 }
295
296 static void ieee80211_restart_work(struct work_struct *work)
297 {
298         struct ieee80211_local *local =
299                 container_of(work, struct ieee80211_local, restart_work);
300
301         /* wait for scan work complete */
302         flush_workqueue(local->workqueue);
303
304         mutex_lock(&local->mtx);
305         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
306                 "%s called with hardware scan in progress\n", __func__);
307         mutex_unlock(&local->mtx);
308
309         rtnl_lock();
310         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)))
311                 ieee80211_scan_cancel(local);
312         ieee80211_reconfig(local);
313         rtnl_unlock();
314 }
315
316 void ieee80211_restart_hw(struct ieee80211_hw *hw)
317 {
318         struct ieee80211_local *local = hw_to_local(hw);
319
320         trace_api_restart_hw(local);
321
322         /* use this reason, ieee80211_reconfig will unblock it */
323         ieee80211_stop_queues_by_reason(hw,
324                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
325
326         schedule_work(&local->restart_work);
327 }
328 EXPORT_SYMBOL(ieee80211_restart_hw);
329
330 static void ieee80211_recalc_smps_work(struct work_struct *work)
331 {
332         struct ieee80211_local *local =
333                 container_of(work, struct ieee80211_local, recalc_smps);
334
335         mutex_lock(&local->iflist_mtx);
336         ieee80211_recalc_smps(local, NULL);
337         mutex_unlock(&local->iflist_mtx);
338 }
339
340 #ifdef CONFIG_INET
341 static int ieee80211_ifa_changed(struct notifier_block *nb,
342                                  unsigned long data, void *arg)
343 {
344         struct in_ifaddr *ifa = arg;
345         struct ieee80211_local *local =
346                 container_of(nb, struct ieee80211_local,
347                              ifa_notifier);
348         struct net_device *ndev = ifa->ifa_dev->dev;
349         struct wireless_dev *wdev = ndev->ieee80211_ptr;
350         struct in_device *idev;
351         struct ieee80211_sub_if_data *sdata;
352         struct ieee80211_bss_conf *bss_conf;
353         struct ieee80211_if_managed *ifmgd;
354         int c = 0;
355
356         /* Make sure it's our interface that got changed */
357         if (!wdev)
358                 return NOTIFY_DONE;
359
360         if (wdev->wiphy != local->hw.wiphy)
361                 return NOTIFY_DONE;
362
363         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
364         bss_conf = &sdata->vif.bss_conf;
365
366         if (!ieee80211_sdata_running(sdata))
367                 return NOTIFY_DONE;
368
369         /* ARP filtering is only supported in managed mode */
370         if (sdata->vif.type != NL80211_IFTYPE_STATION)
371                 return NOTIFY_DONE;
372
373         idev = sdata->dev->ip_ptr;
374         if (!idev)
375                 return NOTIFY_DONE;
376
377         ifmgd = &sdata->u.mgd;
378         mutex_lock(&ifmgd->mtx);
379
380         /* Copy the addresses to the bss_conf list */
381         ifa = idev->ifa_list;
382         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
383                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
384                 ifa = ifa->ifa_next;
385                 c++;
386         }
387
388         /* If not all addresses fit the list, disable filtering */
389         if (ifa) {
390                 sdata->arp_filter_state = false;
391                 c = 0;
392         } else {
393                 sdata->arp_filter_state = true;
394         }
395         bss_conf->arp_addr_cnt = c;
396
397         /* Configure driver only if associated */
398         if (ifmgd->associated) {
399                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
400                 ieee80211_bss_info_change_notify(sdata,
401                                                  BSS_CHANGED_ARP_FILTER);
402         }
403
404         mutex_unlock(&ifmgd->mtx);
405
406         return NOTIFY_DONE;
407 }
408 #endif
409
410 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
411 {
412         struct ieee80211_local *local =
413                 container_of(napi, struct ieee80211_local, napi);
414
415         return local->ops->napi_poll(&local->hw, budget);
416 }
417
418 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
419 {
420         struct ieee80211_local *local = hw_to_local(hw);
421
422         napi_schedule(&local->napi);
423 }
424 EXPORT_SYMBOL(ieee80211_napi_schedule);
425
426 void ieee80211_napi_complete(struct ieee80211_hw *hw)
427 {
428         struct ieee80211_local *local = hw_to_local(hw);
429
430         napi_complete(&local->napi);
431 }
432 EXPORT_SYMBOL(ieee80211_napi_complete);
433
434 /* There isn't a lot of sense in it, but you can transmit anything you like */
435 static const struct ieee80211_txrx_stypes
436 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
437         [NL80211_IFTYPE_ADHOC] = {
438                 .tx = 0xffff,
439                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
440         },
441         [NL80211_IFTYPE_STATION] = {
442                 .tx = 0xffff,
443                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
444                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
445         },
446         [NL80211_IFTYPE_AP] = {
447                 .tx = 0xffff,
448                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
449                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
450                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
451                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
452                         BIT(IEEE80211_STYPE_AUTH >> 4) |
453                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
454                         BIT(IEEE80211_STYPE_ACTION >> 4),
455         },
456         [NL80211_IFTYPE_AP_VLAN] = {
457                 /* copy AP */
458                 .tx = 0xffff,
459                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
460                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
461                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
462                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
463                         BIT(IEEE80211_STYPE_AUTH >> 4) |
464                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
465                         BIT(IEEE80211_STYPE_ACTION >> 4),
466         },
467         [NL80211_IFTYPE_P2P_CLIENT] = {
468                 .tx = 0xffff,
469                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
470                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
471         },
472         [NL80211_IFTYPE_P2P_GO] = {
473                 .tx = 0xffff,
474                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
475                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
476                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
477                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
478                         BIT(IEEE80211_STYPE_AUTH >> 4) |
479                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
480                         BIT(IEEE80211_STYPE_ACTION >> 4),
481         },
482 };
483
484 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
485                                         const struct ieee80211_ops *ops)
486 {
487         struct ieee80211_local *local;
488         int priv_size, i;
489         struct wiphy *wiphy;
490
491         /* Ensure 32-byte alignment of our private data and hw private data.
492          * We use the wiphy priv data for both our ieee80211_local and for
493          * the driver's private data
494          *
495          * In memory it'll be like this:
496          *
497          * +-------------------------+
498          * | struct wiphy           |
499          * +-------------------------+
500          * | struct ieee80211_local  |
501          * +-------------------------+
502          * | driver's private data   |
503          * +-------------------------+
504          *
505          */
506         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
507
508         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
509
510         if (!wiphy)
511                 return NULL;
512
513         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
514
515         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
516                         WIPHY_FLAG_4ADDR_AP |
517                         WIPHY_FLAG_4ADDR_STATION;
518         wiphy->privid = mac80211_wiphy_privid;
519
520         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
521
522         local = wiphy_priv(wiphy);
523
524         local->hw.wiphy = wiphy;
525
526         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
527
528         BUG_ON(!ops->tx);
529         BUG_ON(!ops->start);
530         BUG_ON(!ops->stop);
531         BUG_ON(!ops->config);
532         BUG_ON(!ops->add_interface);
533         BUG_ON(!ops->remove_interface);
534         BUG_ON(!ops->configure_filter);
535         local->ops = ops;
536
537         /* set up some defaults */
538         local->hw.queues = 1;
539         local->hw.max_rates = 1;
540         local->hw.max_report_rates = 0;
541         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
542         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
543         local->user_power_level = -1;
544         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
545         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
546
547         INIT_LIST_HEAD(&local->interfaces);
548
549         __hw_addr_init(&local->mc_list);
550
551         mutex_init(&local->iflist_mtx);
552         mutex_init(&local->mtx);
553
554         mutex_init(&local->key_mtx);
555         spin_lock_init(&local->filter_lock);
556         spin_lock_init(&local->queue_stop_reason_lock);
557
558         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
559
560         ieee80211_work_init(local);
561
562         INIT_WORK(&local->restart_work, ieee80211_restart_work);
563
564         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
565         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
566         local->smps_mode = IEEE80211_SMPS_OFF;
567
568         INIT_WORK(&local->dynamic_ps_enable_work,
569                   ieee80211_dynamic_ps_enable_work);
570         INIT_WORK(&local->dynamic_ps_disable_work,
571                   ieee80211_dynamic_ps_disable_work);
572         setup_timer(&local->dynamic_ps_timer,
573                     ieee80211_dynamic_ps_timer, (unsigned long) local);
574
575         sta_info_init(local);
576
577         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
578                 skb_queue_head_init(&local->pending[i]);
579                 atomic_set(&local->agg_queue_stop[i], 0);
580         }
581         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
582                      (unsigned long)local);
583
584         tasklet_init(&local->tasklet,
585                      ieee80211_tasklet_handler,
586                      (unsigned long) local);
587
588         skb_queue_head_init(&local->skb_queue);
589         skb_queue_head_init(&local->skb_queue_unreliable);
590
591         /* init dummy netdev for use w/ NAPI */
592         init_dummy_netdev(&local->napi_dev);
593
594         return local_to_hw(local);
595 }
596 EXPORT_SYMBOL(ieee80211_alloc_hw);
597
598 int ieee80211_register_hw(struct ieee80211_hw *hw)
599 {
600         struct ieee80211_local *local = hw_to_local(hw);
601         int result;
602         enum ieee80211_band band;
603         int channels, max_bitrates;
604         bool supp_ht;
605         static const u32 cipher_suites[] = {
606                 /* keep WEP first, it may be removed below */
607                 WLAN_CIPHER_SUITE_WEP40,
608                 WLAN_CIPHER_SUITE_WEP104,
609                 WLAN_CIPHER_SUITE_TKIP,
610                 WLAN_CIPHER_SUITE_CCMP,
611
612                 /* keep last -- depends on hw flags! */
613                 WLAN_CIPHER_SUITE_AES_CMAC
614         };
615
616         if (hw->max_report_rates == 0)
617                 hw->max_report_rates = hw->max_rates;
618
619         /*
620          * generic code guarantees at least one band,
621          * set this very early because much code assumes
622          * that hw.conf.channel is assigned
623          */
624         channels = 0;
625         max_bitrates = 0;
626         supp_ht = false;
627         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
628                 struct ieee80211_supported_band *sband;
629
630                 sband = local->hw.wiphy->bands[band];
631                 if (!sband)
632                         continue;
633                 if (!local->oper_channel) {
634                         /* init channel we're on */
635                         local->hw.conf.channel =
636                         local->oper_channel = &sband->channels[0];
637                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
638                 }
639                 channels += sband->n_channels;
640
641                 if (max_bitrates < sband->n_bitrates)
642                         max_bitrates = sband->n_bitrates;
643                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
644         }
645
646         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
647                                       sizeof(void *) * channels, GFP_KERNEL);
648         if (!local->int_scan_req)
649                 return -ENOMEM;
650
651         /* if low-level driver supports AP, we also support VLAN */
652         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
653                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
654
655         /* mac80211 always supports monitor */
656         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
657
658 #ifndef CONFIG_MAC80211_MESH
659         /* mesh depends on Kconfig, but drivers should set it if they want */
660         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
661 #endif
662
663         /* mac80211 supports control port protocol changing */
664         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
665
666         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
667                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
668         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
669                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
670
671         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
672              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
673              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
674
675         /*
676          * Calculate scan IE length -- we need this to alloc
677          * memory and to subtract from the driver limit. It
678          * includes the (extended) supported rates and HT
679          * information -- SSID is the driver's responsibility.
680          */
681         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
682         if (supp_ht)
683                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
684
685         if (!local->ops->hw_scan) {
686                 /* For hw_scan, driver needs to set these up. */
687                 local->hw.wiphy->max_scan_ssids = 4;
688                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
689         }
690
691         /*
692          * If the driver supports any scan IEs, then assume the
693          * limit includes the IEs mac80211 will add, otherwise
694          * leave it at zero and let the driver sort it out; we
695          * still pass our IEs to the driver but userspace will
696          * not be allowed to in that case.
697          */
698         if (local->hw.wiphy->max_scan_ie_len)
699                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
700
701         /* Set up cipher suites unless driver already did */
702         if (!local->hw.wiphy->cipher_suites) {
703                 local->hw.wiphy->cipher_suites = cipher_suites;
704                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
705                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
706                         local->hw.wiphy->n_cipher_suites--;
707         }
708         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
709                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
710                         local->hw.wiphy->cipher_suites += 2;
711                         local->hw.wiphy->n_cipher_suites -= 2;
712                 } else {
713                         u32 *suites;
714                         int r, w = 0;
715
716                         /* Filter out WEP */
717
718                         suites = kmemdup(
719                                 local->hw.wiphy->cipher_suites,
720                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
721                                 GFP_KERNEL);
722                         if (!suites)
723                                 return -ENOMEM;
724                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
725                                 u32 suite = local->hw.wiphy->cipher_suites[r];
726                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
727                                     suite == WLAN_CIPHER_SUITE_WEP104)
728                                         continue;
729                                 suites[w++] = suite;
730                         }
731                         local->hw.wiphy->cipher_suites = suites;
732                         local->hw.wiphy->n_cipher_suites = w;
733                         local->wiphy_ciphers_allocated = true;
734                 }
735         }
736
737         result = wiphy_register(local->hw.wiphy);
738         if (result < 0)
739                 goto fail_wiphy_register;
740
741         /*
742          * We use the number of queues for feature tests (QoS, HT) internally
743          * so restrict them appropriately.
744          */
745         if (hw->queues > IEEE80211_MAX_QUEUES)
746                 hw->queues = IEEE80211_MAX_QUEUES;
747
748         local->workqueue =
749                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
750         if (!local->workqueue) {
751                 result = -ENOMEM;
752                 goto fail_workqueue;
753         }
754
755         /*
756          * The hardware needs headroom for sending the frame,
757          * and we need some headroom for passing the frame to monitor
758          * interfaces, but never both at the same time.
759          */
760         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
761                         sizeof(struct ieee80211_tx_status_rtap_hdr));
762         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
763                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
764
765         debugfs_hw_add(local);
766
767         /*
768          * if the driver doesn't specify a max listen interval we
769          * use 5 which should be a safe default
770          */
771         if (local->hw.max_listen_interval == 0)
772                 local->hw.max_listen_interval = 5;
773
774         local->hw.conf.listen_interval = local->hw.max_listen_interval;
775
776         local->dynamic_ps_forced_timeout = -1;
777
778         result = sta_info_start(local);
779         if (result < 0)
780                 goto fail_sta_info;
781
782         result = ieee80211_wep_init(local);
783         if (result < 0)
784                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
785                             result);
786
787         rtnl_lock();
788
789         result = ieee80211_init_rate_ctrl_alg(local,
790                                               hw->rate_control_algorithm);
791         if (result < 0) {
792                 wiphy_debug(local->hw.wiphy,
793                             "Failed to initialize rate control algorithm\n");
794                 goto fail_rate;
795         }
796
797         /* add one default STA interface if supported */
798         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
799                 result = ieee80211_if_add(local, "wlan%d", NULL,
800                                           NL80211_IFTYPE_STATION, NULL);
801                 if (result)
802                         wiphy_warn(local->hw.wiphy,
803                                    "Failed to add default virtual iface\n");
804         }
805
806         rtnl_unlock();
807
808         ieee80211_led_init(local);
809
810         local->network_latency_notifier.notifier_call =
811                 ieee80211_max_network_latency;
812         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
813                                      &local->network_latency_notifier);
814         if (result) {
815                 rtnl_lock();
816                 goto fail_pm_qos;
817         }
818
819 #ifdef CONFIG_INET
820         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
821         result = register_inetaddr_notifier(&local->ifa_notifier);
822         if (result)
823                 goto fail_ifa;
824 #endif
825
826         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
827                         local->hw.napi_weight);
828
829         return 0;
830
831 #ifdef CONFIG_INET
832  fail_ifa:
833         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
834                                &local->network_latency_notifier);
835         rtnl_lock();
836 #endif
837  fail_pm_qos:
838         ieee80211_led_exit(local);
839         ieee80211_remove_interfaces(local);
840  fail_rate:
841         rtnl_unlock();
842         ieee80211_wep_free(local);
843         sta_info_stop(local);
844  fail_sta_info:
845         destroy_workqueue(local->workqueue);
846  fail_workqueue:
847         wiphy_unregister(local->hw.wiphy);
848  fail_wiphy_register:
849         if (local->wiphy_ciphers_allocated)
850                 kfree(local->hw.wiphy->cipher_suites);
851         kfree(local->int_scan_req);
852         return result;
853 }
854 EXPORT_SYMBOL(ieee80211_register_hw);
855
856 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
857 {
858         struct ieee80211_local *local = hw_to_local(hw);
859
860         tasklet_kill(&local->tx_pending_tasklet);
861         tasklet_kill(&local->tasklet);
862
863         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
864                                &local->network_latency_notifier);
865 #ifdef CONFIG_INET
866         unregister_inetaddr_notifier(&local->ifa_notifier);
867 #endif
868
869         rtnl_lock();
870
871         /*
872          * At this point, interface list manipulations are fine
873          * because the driver cannot be handing us frames any
874          * more and the tasklet is killed.
875          */
876         ieee80211_remove_interfaces(local);
877
878         rtnl_unlock();
879
880         /*
881          * Now all work items will be gone, but the
882          * timer might still be armed, so delete it
883          */
884         del_timer_sync(&local->work_timer);
885
886         cancel_work_sync(&local->restart_work);
887         cancel_work_sync(&local->reconfig_filter);
888
889         ieee80211_clear_tx_pending(local);
890         sta_info_stop(local);
891         rate_control_deinitialize(local);
892
893         if (skb_queue_len(&local->skb_queue) ||
894             skb_queue_len(&local->skb_queue_unreliable))
895                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
896         skb_queue_purge(&local->skb_queue);
897         skb_queue_purge(&local->skb_queue_unreliable);
898
899         destroy_workqueue(local->workqueue);
900         wiphy_unregister(local->hw.wiphy);
901         ieee80211_wep_free(local);
902         ieee80211_led_exit(local);
903         kfree(local->int_scan_req);
904 }
905 EXPORT_SYMBOL(ieee80211_unregister_hw);
906
907 void ieee80211_free_hw(struct ieee80211_hw *hw)
908 {
909         struct ieee80211_local *local = hw_to_local(hw);
910
911         mutex_destroy(&local->iflist_mtx);
912         mutex_destroy(&local->mtx);
913
914         if (local->wiphy_ciphers_allocated)
915                 kfree(local->hw.wiphy->cipher_suites);
916
917         wiphy_free(local->hw.wiphy);
918 }
919 EXPORT_SYMBOL(ieee80211_free_hw);
920
921 static int __init ieee80211_init(void)
922 {
923         struct sk_buff *skb;
924         int ret;
925
926         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
927         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
928                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
929
930         ret = rc80211_minstrel_init();
931         if (ret)
932                 return ret;
933
934         ret = rc80211_minstrel_ht_init();
935         if (ret)
936                 goto err_minstrel;
937
938         ret = rc80211_pid_init();
939         if (ret)
940                 goto err_pid;
941
942         ret = ieee80211_iface_init();
943         if (ret)
944                 goto err_netdev;
945
946         return 0;
947  err_netdev:
948         rc80211_pid_exit();
949  err_pid:
950         rc80211_minstrel_ht_exit();
951  err_minstrel:
952         rc80211_minstrel_exit();
953
954         return ret;
955 }
956
957 static void __exit ieee80211_exit(void)
958 {
959         rc80211_pid_exit();
960         rc80211_minstrel_ht_exit();
961         rc80211_minstrel_exit();
962
963         /*
964          * For key todo, it'll be empty by now but the work
965          * might still be scheduled.
966          */
967         flush_scheduled_work();
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");