a46ff06d7cb8ce9d8e31fd593555925c9aa07500
[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 static struct lock_class_key ieee80211_rx_skb_queue_class;
43
44 void ieee80211_configure_filter(struct ieee80211_local *local)
45 {
46         u64 mc;
47         unsigned int changed_flags;
48         unsigned int new_flags = 0;
49
50         if (atomic_read(&local->iff_promiscs))
51                 new_flags |= FIF_PROMISC_IN_BSS;
52
53         if (atomic_read(&local->iff_allmultis))
54                 new_flags |= FIF_ALLMULTI;
55
56         if (local->monitors || local->scanning)
57                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
58
59         if (local->fif_probe_req || local->probe_req_reg)
60                 new_flags |= FIF_PROBE_REQ;
61
62         if (local->fif_fcsfail)
63                 new_flags |= FIF_FCSFAIL;
64
65         if (local->fif_plcpfail)
66                 new_flags |= FIF_PLCPFAIL;
67
68         if (local->fif_control)
69                 new_flags |= FIF_CONTROL;
70
71         if (local->fif_other_bss)
72                 new_flags |= FIF_OTHER_BSS;
73
74         if (local->fif_pspoll)
75                 new_flags |= FIF_PSPOLL;
76
77         spin_lock_bh(&local->filter_lock);
78         changed_flags = local->filter_flags ^ new_flags;
79
80         mc = drv_prepare_multicast(local, &local->mc_list);
81         spin_unlock_bh(&local->filter_lock);
82
83         /* be a bit nasty */
84         new_flags |= (1<<31);
85
86         drv_configure_filter(local, changed_flags, &new_flags, mc);
87
88         WARN_ON(new_flags & (1<<31));
89
90         local->filter_flags = new_flags & ~(1<<31);
91 }
92
93 static void ieee80211_reconfig_filter(struct work_struct *work)
94 {
95         struct ieee80211_local *local =
96                 container_of(work, struct ieee80211_local, reconfig_filter);
97
98         ieee80211_configure_filter(local);
99 }
100
101 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
102 {
103         struct ieee80211_channel *chan, *scan_chan;
104         int ret = 0;
105         int power;
106         enum nl80211_channel_type channel_type;
107         u32 offchannel_flag;
108
109         might_sleep();
110
111         scan_chan = local->scan_channel;
112
113         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
114         if (scan_chan) {
115                 chan = scan_chan;
116                 channel_type = NL80211_CHAN_NO_HT;
117                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
118         } else if (local->tmp_channel &&
119                    local->oper_channel != local->tmp_channel) {
120                 chan = scan_chan = local->tmp_channel;
121                 channel_type = local->tmp_channel_type;
122                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
123         } else {
124                 chan = local->oper_channel;
125                 channel_type = local->_oper_channel_type;
126                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
127         }
128         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
129
130         if (offchannel_flag || chan != local->hw.conf.channel ||
131             channel_type != local->hw.conf.channel_type) {
132                 local->hw.conf.channel = chan;
133                 local->hw.conf.channel_type = channel_type;
134                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
135         }
136
137         if (!conf_is_ht(&local->hw.conf)) {
138                 /*
139                  * mac80211.h documents that this is only valid
140                  * when the channel is set to an HT type, and
141                  * that otherwise STATIC is used.
142                  */
143                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
144         } else if (local->hw.conf.smps_mode != local->smps_mode) {
145                 local->hw.conf.smps_mode = local->smps_mode;
146                 changed |= IEEE80211_CONF_CHANGE_SMPS;
147         }
148
149         if (scan_chan)
150                 power = chan->max_power;
151         else
152                 power = local->power_constr_level ?
153                         (chan->max_power - local->power_constr_level) :
154                         chan->max_power;
155
156         if (local->user_power_level >= 0)
157                 power = min(power, local->user_power_level);
158
159         if (local->hw.conf.power_level != power) {
160                 changed |= IEEE80211_CONF_CHANGE_POWER;
161                 local->hw.conf.power_level = power;
162         }
163
164         if (changed && local->open_count) {
165                 ret = drv_config(local, changed);
166                 /*
167                  * Goal:
168                  * HW reconfiguration should never fail, the driver has told
169                  * us what it can support so it should live up to that promise.
170                  *
171                  * Current status:
172                  * rfkill is not integrated with mac80211 and a
173                  * configuration command can thus fail if hardware rfkill
174                  * is enabled
175                  *
176                  * FIXME: integrate rfkill with mac80211 and then add this
177                  * WARN_ON() back
178                  *
179                  */
180                 /* WARN_ON(ret); */
181         }
182
183         return ret;
184 }
185
186 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
187                                       u32 changed)
188 {
189         struct ieee80211_local *local = sdata->local;
190         static const u8 zero[ETH_ALEN] = { 0 };
191
192         if (!changed)
193                 return;
194
195         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
196                 /*
197                  * While not associated, claim a BSSID of all-zeroes
198                  * so that drivers don't do any weird things with the
199                  * BSSID at that time.
200                  */
201                 if (sdata->vif.bss_conf.assoc)
202                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
203                 else
204                         sdata->vif.bss_conf.bssid = zero;
205         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
206                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
207         else if (sdata->vif.type == NL80211_IFTYPE_AP)
208                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
209         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
210                 sdata->vif.bss_conf.bssid = NULL;
211         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
212                 sdata->vif.bss_conf.bssid = zero;
213         } else {
214                 WARN_ON(1);
215                 return;
216         }
217
218         switch (sdata->vif.type) {
219         case NL80211_IFTYPE_AP:
220         case NL80211_IFTYPE_ADHOC:
221         case NL80211_IFTYPE_WDS:
222         case NL80211_IFTYPE_MESH_POINT:
223                 break;
224         default:
225                 /* do not warn to simplify caller in scan.c */
226                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
227                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
228                         return;
229                 break;
230         }
231
232         if (changed & BSS_CHANGED_BEACON_ENABLED) {
233                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
234                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
235                         sdata->vif.bss_conf.enable_beacon = false;
236                 } else {
237                         /*
238                          * Beacon should be enabled, but AP mode must
239                          * check whether there is a beacon configured.
240                          */
241                         switch (sdata->vif.type) {
242                         case NL80211_IFTYPE_AP:
243                                 sdata->vif.bss_conf.enable_beacon =
244                                         !!sdata->u.ap.beacon;
245                                 break;
246                         case NL80211_IFTYPE_ADHOC:
247                                 sdata->vif.bss_conf.enable_beacon =
248                                         !!sdata->u.ibss.presp;
249                                 break;
250 #ifdef CONFIG_MAC80211_MESH
251                         case NL80211_IFTYPE_MESH_POINT:
252                                 sdata->vif.bss_conf.enable_beacon =
253                                         !!sdata->u.mesh.mesh_id_len;
254                                 break;
255 #endif
256                         default:
257                                 /* not reached */
258                                 WARN_ON(1);
259                                 break;
260                         }
261                 }
262         }
263
264         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
265 }
266
267 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
268 {
269         sdata->vif.bss_conf.use_cts_prot = false;
270         sdata->vif.bss_conf.use_short_preamble = false;
271         sdata->vif.bss_conf.use_short_slot = false;
272         return BSS_CHANGED_ERP_CTS_PROT |
273                BSS_CHANGED_ERP_PREAMBLE |
274                BSS_CHANGED_ERP_SLOT;
275 }
276
277 static void ieee80211_tasklet_handler(unsigned long data)
278 {
279         struct ieee80211_local *local = (struct ieee80211_local *) data;
280         struct sk_buff *skb;
281
282         while ((skb = skb_dequeue(&local->skb_queue)) ||
283                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
284                 switch (skb->pkt_type) {
285                 case IEEE80211_RX_MSG:
286                         /* Clear skb->pkt_type in order to not confuse kernel
287                          * netstack. */
288                         skb->pkt_type = 0;
289                         ieee80211_rx(local_to_hw(local), skb);
290                         break;
291                 case IEEE80211_TX_STATUS_MSG:
292                         skb->pkt_type = 0;
293                         ieee80211_tx_status(local_to_hw(local), skb);
294                         break;
295                 default:
296                         WARN(1, "mac80211: Packet is of unknown type %d\n",
297                              skb->pkt_type);
298                         dev_kfree_skb(skb);
299                         break;
300                 }
301         }
302 }
303
304 static void ieee80211_restart_work(struct work_struct *work)
305 {
306         struct ieee80211_local *local =
307                 container_of(work, struct ieee80211_local, restart_work);
308
309         /* wait for scan work complete */
310         flush_workqueue(local->workqueue);
311
312         mutex_lock(&local->mtx);
313         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
314                 "%s called with hardware scan in progress\n", __func__);
315         mutex_unlock(&local->mtx);
316
317         rtnl_lock();
318         ieee80211_scan_cancel(local);
319         ieee80211_reconfig(local);
320         rtnl_unlock();
321 }
322
323 void ieee80211_restart_hw(struct ieee80211_hw *hw)
324 {
325         struct ieee80211_local *local = hw_to_local(hw);
326
327         trace_api_restart_hw(local);
328
329         /* use this reason, ieee80211_reconfig will unblock it */
330         ieee80211_stop_queues_by_reason(hw,
331                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
332
333         schedule_work(&local->restart_work);
334 }
335 EXPORT_SYMBOL(ieee80211_restart_hw);
336
337 static void ieee80211_recalc_smps_work(struct work_struct *work)
338 {
339         struct ieee80211_local *local =
340                 container_of(work, struct ieee80211_local, recalc_smps);
341
342         mutex_lock(&local->iflist_mtx);
343         ieee80211_recalc_smps(local);
344         mutex_unlock(&local->iflist_mtx);
345 }
346
347 #ifdef CONFIG_INET
348 static int ieee80211_ifa_changed(struct notifier_block *nb,
349                                  unsigned long data, void *arg)
350 {
351         struct in_ifaddr *ifa = arg;
352         struct ieee80211_local *local =
353                 container_of(nb, struct ieee80211_local,
354                              ifa_notifier);
355         struct net_device *ndev = ifa->ifa_dev->dev;
356         struct wireless_dev *wdev = ndev->ieee80211_ptr;
357         struct in_device *idev;
358         struct ieee80211_sub_if_data *sdata;
359         struct ieee80211_bss_conf *bss_conf;
360         struct ieee80211_if_managed *ifmgd;
361         int c = 0;
362
363         /* Make sure it's our interface that got changed */
364         if (!wdev)
365                 return NOTIFY_DONE;
366
367         if (wdev->wiphy != local->hw.wiphy)
368                 return NOTIFY_DONE;
369
370         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
371         bss_conf = &sdata->vif.bss_conf;
372
373         if (!ieee80211_sdata_running(sdata))
374                 return NOTIFY_DONE;
375
376         /* ARP filtering is only supported in managed mode */
377         if (sdata->vif.type != NL80211_IFTYPE_STATION)
378                 return NOTIFY_DONE;
379
380         idev = __in_dev_get_rtnl(sdata->dev);
381         if (!idev)
382                 return NOTIFY_DONE;
383
384         ifmgd = &sdata->u.mgd;
385         mutex_lock(&ifmgd->mtx);
386
387         /* Copy the addresses to the bss_conf list */
388         ifa = idev->ifa_list;
389         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
390                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
391                 ifa = ifa->ifa_next;
392                 c++;
393         }
394
395         /* If not all addresses fit the list, disable filtering */
396         if (ifa) {
397                 sdata->arp_filter_state = false;
398                 c = 0;
399         } else {
400                 sdata->arp_filter_state = true;
401         }
402         bss_conf->arp_addr_cnt = c;
403
404         /* Configure driver only if associated */
405         if (ifmgd->associated) {
406                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
407                 ieee80211_bss_info_change_notify(sdata,
408                                                  BSS_CHANGED_ARP_FILTER);
409         }
410
411         mutex_unlock(&ifmgd->mtx);
412
413         return NOTIFY_DONE;
414 }
415 #endif
416
417 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
418 {
419         struct ieee80211_local *local =
420                 container_of(napi, struct ieee80211_local, napi);
421
422         return local->ops->napi_poll(&local->hw, budget);
423 }
424
425 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
426 {
427         struct ieee80211_local *local = hw_to_local(hw);
428
429         napi_schedule(&local->napi);
430 }
431 EXPORT_SYMBOL(ieee80211_napi_schedule);
432
433 void ieee80211_napi_complete(struct ieee80211_hw *hw)
434 {
435         struct ieee80211_local *local = hw_to_local(hw);
436
437         napi_complete(&local->napi);
438 }
439 EXPORT_SYMBOL(ieee80211_napi_complete);
440
441 /* There isn't a lot of sense in it, but you can transmit anything you like */
442 static const struct ieee80211_txrx_stypes
443 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
444         [NL80211_IFTYPE_ADHOC] = {
445                 .tx = 0xffff,
446                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
447         },
448         [NL80211_IFTYPE_STATION] = {
449                 .tx = 0xffff,
450                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
451                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
452         },
453         [NL80211_IFTYPE_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_AP_VLAN] = {
464                 /* copy AP */
465                 .tx = 0xffff,
466                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
467                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
468                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
469                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
470                         BIT(IEEE80211_STYPE_AUTH >> 4) |
471                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
472                         BIT(IEEE80211_STYPE_ACTION >> 4),
473         },
474         [NL80211_IFTYPE_P2P_CLIENT] = {
475                 .tx = 0xffff,
476                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
477                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
478         },
479         [NL80211_IFTYPE_P2P_GO] = {
480                 .tx = 0xffff,
481                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
482                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
483                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
484                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
485                         BIT(IEEE80211_STYPE_AUTH >> 4) |
486                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
487                         BIT(IEEE80211_STYPE_ACTION >> 4),
488         },
489         [NL80211_IFTYPE_MESH_POINT] = {
490                 .tx = 0xffff,
491                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
492         },
493 };
494
495 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
496                                         const struct ieee80211_ops *ops)
497 {
498         struct ieee80211_local *local;
499         int priv_size, i;
500         struct wiphy *wiphy;
501
502         /* Ensure 32-byte alignment of our private data and hw private data.
503          * We use the wiphy priv data for both our ieee80211_local and for
504          * the driver's private data
505          *
506          * In memory it'll be like this:
507          *
508          * +-------------------------+
509          * | struct wiphy           |
510          * +-------------------------+
511          * | struct ieee80211_local  |
512          * +-------------------------+
513          * | driver's private data   |
514          * +-------------------------+
515          *
516          */
517         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
518
519         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
520
521         if (!wiphy)
522                 return NULL;
523
524         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
525
526         wiphy->privid = mac80211_wiphy_privid;
527
528         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
529                         WIPHY_FLAG_4ADDR_AP |
530                         WIPHY_FLAG_4ADDR_STATION |
531                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
532
533         if (!ops->set_key)
534                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
535
536         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
537
538         local = wiphy_priv(wiphy);
539
540         local->hw.wiphy = wiphy;
541
542         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
543
544         BUG_ON(!ops->tx);
545         BUG_ON(!ops->start);
546         BUG_ON(!ops->stop);
547         BUG_ON(!ops->config);
548         BUG_ON(!ops->add_interface);
549         BUG_ON(!ops->remove_interface);
550         BUG_ON(!ops->configure_filter);
551         local->ops = ops;
552
553         /* set up some defaults */
554         local->hw.queues = 1;
555         local->hw.max_rates = 1;
556         local->hw.max_report_rates = 0;
557         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
558         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
559         local->user_power_level = -1;
560         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
561         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
562
563         INIT_LIST_HEAD(&local->interfaces);
564
565         __hw_addr_init(&local->mc_list);
566
567         mutex_init(&local->iflist_mtx);
568         mutex_init(&local->mtx);
569
570         mutex_init(&local->key_mtx);
571         spin_lock_init(&local->filter_lock);
572         spin_lock_init(&local->queue_stop_reason_lock);
573
574         /*
575          * The rx_skb_queue is only accessed from tasklets,
576          * but other SKB queues are used from within IRQ
577          * context. Therefore, this one needs a different
578          * locking class so our direct, non-irq-safe use of
579          * the queue's lock doesn't throw lockdep warnings.
580          */
581         skb_queue_head_init_class(&local->rx_skb_queue,
582                                   &ieee80211_rx_skb_queue_class);
583
584         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
585
586         ieee80211_work_init(local);
587
588         INIT_WORK(&local->restart_work, ieee80211_restart_work);
589
590         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
591         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
592         local->smps_mode = IEEE80211_SMPS_OFF;
593
594         INIT_WORK(&local->dynamic_ps_enable_work,
595                   ieee80211_dynamic_ps_enable_work);
596         INIT_WORK(&local->dynamic_ps_disable_work,
597                   ieee80211_dynamic_ps_disable_work);
598         setup_timer(&local->dynamic_ps_timer,
599                     ieee80211_dynamic_ps_timer, (unsigned long) local);
600
601         sta_info_init(local);
602
603         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
604                 skb_queue_head_init(&local->pending[i]);
605                 atomic_set(&local->agg_queue_stop[i], 0);
606         }
607         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
608                      (unsigned long)local);
609
610         tasklet_init(&local->tasklet,
611                      ieee80211_tasklet_handler,
612                      (unsigned long) local);
613
614         skb_queue_head_init(&local->skb_queue);
615         skb_queue_head_init(&local->skb_queue_unreliable);
616
617         /* init dummy netdev for use w/ NAPI */
618         init_dummy_netdev(&local->napi_dev);
619
620         ieee80211_led_names(local);
621
622         ieee80211_hw_roc_setup(local);
623
624         return local_to_hw(local);
625 }
626 EXPORT_SYMBOL(ieee80211_alloc_hw);
627
628 int ieee80211_register_hw(struct ieee80211_hw *hw)
629 {
630         struct ieee80211_local *local = hw_to_local(hw);
631         int result;
632         enum ieee80211_band band;
633         int channels, max_bitrates;
634         bool supp_ht;
635         static const u32 cipher_suites[] = {
636                 /* keep WEP first, it may be removed below */
637                 WLAN_CIPHER_SUITE_WEP40,
638                 WLAN_CIPHER_SUITE_WEP104,
639                 WLAN_CIPHER_SUITE_TKIP,
640                 WLAN_CIPHER_SUITE_CCMP,
641
642                 /* keep last -- depends on hw flags! */
643                 WLAN_CIPHER_SUITE_AES_CMAC
644         };
645
646         if (hw->max_report_rates == 0)
647                 hw->max_report_rates = hw->max_rates;
648
649         /*
650          * generic code guarantees at least one band,
651          * set this very early because much code assumes
652          * that hw.conf.channel is assigned
653          */
654         channels = 0;
655         max_bitrates = 0;
656         supp_ht = false;
657         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
658                 struct ieee80211_supported_band *sband;
659
660                 sband = local->hw.wiphy->bands[band];
661                 if (!sband)
662                         continue;
663                 if (!local->oper_channel) {
664                         /* init channel we're on */
665                         local->hw.conf.channel =
666                         local->oper_channel = &sband->channels[0];
667                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
668                 }
669                 channels += sband->n_channels;
670
671                 if (max_bitrates < sband->n_bitrates)
672                         max_bitrates = sband->n_bitrates;
673                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
674         }
675
676         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
677                                       sizeof(void *) * channels, GFP_KERNEL);
678         if (!local->int_scan_req)
679                 return -ENOMEM;
680
681         /* if low-level driver supports AP, we also support VLAN */
682         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
683                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
684
685         /* mac80211 always supports monitor */
686         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
687
688 #ifndef CONFIG_MAC80211_MESH
689         /* mesh depends on Kconfig, but drivers should set it if they want */
690         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
691 #endif
692
693         /* mac80211 supports control port protocol changing */
694         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
695
696         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
697                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
698         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
699                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
700
701         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
702              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
703              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
704
705         /*
706          * Calculate scan IE length -- we need this to alloc
707          * memory and to subtract from the driver limit. It
708          * includes the DS Params, (extended) supported rates, and HT
709          * information -- SSID is the driver's responsibility.
710          */
711         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
712                 3 /* DS Params */;
713         if (supp_ht)
714                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
715
716         if (!local->ops->hw_scan) {
717                 /* For hw_scan, driver needs to set these up. */
718                 local->hw.wiphy->max_scan_ssids = 4;
719                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
720         }
721
722         /*
723          * If the driver supports any scan IEs, then assume the
724          * limit includes the IEs mac80211 will add, otherwise
725          * leave it at zero and let the driver sort it out; we
726          * still pass our IEs to the driver but userspace will
727          * not be allowed to in that case.
728          */
729         if (local->hw.wiphy->max_scan_ie_len)
730                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
731
732         /* Set up cipher suites unless driver already did */
733         if (!local->hw.wiphy->cipher_suites) {
734                 local->hw.wiphy->cipher_suites = cipher_suites;
735                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
736                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
737                         local->hw.wiphy->n_cipher_suites--;
738         }
739         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
740                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
741                         local->hw.wiphy->cipher_suites += 2;
742                         local->hw.wiphy->n_cipher_suites -= 2;
743                 } else {
744                         u32 *suites;
745                         int r, w = 0;
746
747                         /* Filter out WEP */
748
749                         suites = kmemdup(
750                                 local->hw.wiphy->cipher_suites,
751                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
752                                 GFP_KERNEL);
753                         if (!suites)
754                                 return -ENOMEM;
755                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
756                                 u32 suite = local->hw.wiphy->cipher_suites[r];
757                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
758                                     suite == WLAN_CIPHER_SUITE_WEP104)
759                                         continue;
760                                 suites[w++] = suite;
761                         }
762                         local->hw.wiphy->cipher_suites = suites;
763                         local->hw.wiphy->n_cipher_suites = w;
764                         local->wiphy_ciphers_allocated = true;
765                 }
766         }
767
768         if (!local->ops->remain_on_channel)
769                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
770
771         result = wiphy_register(local->hw.wiphy);
772         if (result < 0)
773                 goto fail_wiphy_register;
774
775         /*
776          * We use the number of queues for feature tests (QoS, HT) internally
777          * so restrict them appropriately.
778          */
779         if (hw->queues > IEEE80211_MAX_QUEUES)
780                 hw->queues = IEEE80211_MAX_QUEUES;
781
782         local->workqueue =
783                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
784         if (!local->workqueue) {
785                 result = -ENOMEM;
786                 goto fail_workqueue;
787         }
788
789         /*
790          * The hardware needs headroom for sending the frame,
791          * and we need some headroom for passing the frame to monitor
792          * interfaces, but never both at the same time.
793          */
794         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
795                         sizeof(struct ieee80211_tx_status_rtap_hdr));
796         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
797                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
798
799         debugfs_hw_add(local);
800
801         /*
802          * if the driver doesn't specify a max listen interval we
803          * use 5 which should be a safe default
804          */
805         if (local->hw.max_listen_interval == 0)
806                 local->hw.max_listen_interval = 5;
807
808         local->hw.conf.listen_interval = local->hw.max_listen_interval;
809
810         local->dynamic_ps_forced_timeout = -1;
811
812         result = sta_info_start(local);
813         if (result < 0)
814                 goto fail_sta_info;
815
816         result = ieee80211_wep_init(local);
817         if (result < 0)
818                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
819                             result);
820
821         rtnl_lock();
822
823         result = ieee80211_init_rate_ctrl_alg(local,
824                                               hw->rate_control_algorithm);
825         if (result < 0) {
826                 wiphy_debug(local->hw.wiphy,
827                             "Failed to initialize rate control algorithm\n");
828                 goto fail_rate;
829         }
830
831         /* add one default STA interface if supported */
832         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
833                 result = ieee80211_if_add(local, "wlan%d", NULL,
834                                           NL80211_IFTYPE_STATION, NULL);
835                 if (result)
836                         wiphy_warn(local->hw.wiphy,
837                                    "Failed to add default virtual iface\n");
838         }
839
840         rtnl_unlock();
841
842         ieee80211_led_init(local);
843
844         local->network_latency_notifier.notifier_call =
845                 ieee80211_max_network_latency;
846         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
847                                      &local->network_latency_notifier);
848         if (result) {
849                 rtnl_lock();
850                 goto fail_pm_qos;
851         }
852
853 #ifdef CONFIG_INET
854         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
855         result = register_inetaddr_notifier(&local->ifa_notifier);
856         if (result)
857                 goto fail_ifa;
858 #endif
859
860         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
861                         local->hw.napi_weight);
862
863         return 0;
864
865 #ifdef CONFIG_INET
866  fail_ifa:
867         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
868                                &local->network_latency_notifier);
869         rtnl_lock();
870 #endif
871  fail_pm_qos:
872         ieee80211_led_exit(local);
873         ieee80211_remove_interfaces(local);
874  fail_rate:
875         rtnl_unlock();
876         ieee80211_wep_free(local);
877         sta_info_stop(local);
878  fail_sta_info:
879         destroy_workqueue(local->workqueue);
880  fail_workqueue:
881         wiphy_unregister(local->hw.wiphy);
882  fail_wiphy_register:
883         if (local->wiphy_ciphers_allocated)
884                 kfree(local->hw.wiphy->cipher_suites);
885         kfree(local->int_scan_req);
886         return result;
887 }
888 EXPORT_SYMBOL(ieee80211_register_hw);
889
890 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
891 {
892         struct ieee80211_local *local = hw_to_local(hw);
893
894         tasklet_kill(&local->tx_pending_tasklet);
895         tasklet_kill(&local->tasklet);
896
897         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
898                                &local->network_latency_notifier);
899 #ifdef CONFIG_INET
900         unregister_inetaddr_notifier(&local->ifa_notifier);
901 #endif
902
903         rtnl_lock();
904
905         /*
906          * At this point, interface list manipulations are fine
907          * because the driver cannot be handing us frames any
908          * more and the tasklet is killed.
909          */
910         ieee80211_remove_interfaces(local);
911
912         rtnl_unlock();
913
914         /*
915          * Now all work items will be gone, but the
916          * timer might still be armed, so delete it
917          */
918         del_timer_sync(&local->work_timer);
919
920         cancel_work_sync(&local->restart_work);
921         cancel_work_sync(&local->reconfig_filter);
922
923         ieee80211_clear_tx_pending(local);
924         sta_info_stop(local);
925         rate_control_deinitialize(local);
926
927         if (skb_queue_len(&local->skb_queue) ||
928             skb_queue_len(&local->skb_queue_unreliable))
929                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
930         skb_queue_purge(&local->skb_queue);
931         skb_queue_purge(&local->skb_queue_unreliable);
932         skb_queue_purge(&local->rx_skb_queue);
933
934         destroy_workqueue(local->workqueue);
935         wiphy_unregister(local->hw.wiphy);
936         ieee80211_wep_free(local);
937         ieee80211_led_exit(local);
938         kfree(local->int_scan_req);
939 }
940 EXPORT_SYMBOL(ieee80211_unregister_hw);
941
942 void ieee80211_free_hw(struct ieee80211_hw *hw)
943 {
944         struct ieee80211_local *local = hw_to_local(hw);
945
946         mutex_destroy(&local->iflist_mtx);
947         mutex_destroy(&local->mtx);
948
949         if (local->wiphy_ciphers_allocated)
950                 kfree(local->hw.wiphy->cipher_suites);
951
952         wiphy_free(local->hw.wiphy);
953 }
954 EXPORT_SYMBOL(ieee80211_free_hw);
955
956 static int __init ieee80211_init(void)
957 {
958         struct sk_buff *skb;
959         int ret;
960
961         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
962         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
963                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
964
965         ret = rc80211_minstrel_init();
966         if (ret)
967                 return ret;
968
969         ret = rc80211_minstrel_ht_init();
970         if (ret)
971                 goto err_minstrel;
972
973         ret = rc80211_pid_init();
974         if (ret)
975                 goto err_pid;
976
977         ret = ieee80211_iface_init();
978         if (ret)
979                 goto err_netdev;
980
981         return 0;
982  err_netdev:
983         rc80211_pid_exit();
984  err_pid:
985         rc80211_minstrel_ht_exit();
986  err_minstrel:
987         rc80211_minstrel_exit();
988
989         return ret;
990 }
991
992 static void __exit ieee80211_exit(void)
993 {
994         rc80211_pid_exit();
995         rc80211_minstrel_ht_exit();
996         rc80211_minstrel_exit();
997
998         if (mesh_allocated)
999                 ieee80211s_stop();
1000
1001         ieee80211_iface_exit();
1002 }
1003
1004
1005 subsys_initcall(ieee80211_init);
1006 module_exit(ieee80211_exit);
1007
1008 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1009 MODULE_LICENSE("GPL");