mac80211: Optimize scans on current operating channel.
[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 /*
102  * Returns true if we are logically configured to be on
103  * the operating channel AND the hardware-conf is currently
104  * configured on the operating channel.  Compares channel-type
105  * as well.
106  */
107 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
108 {
109         struct ieee80211_channel *chan, *scan_chan;
110         enum nl80211_channel_type channel_type;
111
112         /* This logic needs to match logic in ieee80211_hw_config */
113         if (local->scan_channel) {
114                 chan = local->scan_channel;
115                 channel_type = NL80211_CHAN_NO_HT;
116         } else if (local->tmp_channel) {
117                 chan = scan_chan = local->tmp_channel;
118                 channel_type = local->tmp_channel_type;
119         } else {
120                 chan = local->oper_channel;
121                 channel_type = local->_oper_channel_type;
122         }
123
124         if (chan != local->oper_channel ||
125             channel_type != local->_oper_channel_type)
126                 return false;
127
128         /* Check current hardware-config against oper_channel. */
129         if ((local->oper_channel != local->hw.conf.channel) ||
130             (local->_oper_channel_type != local->hw.conf.channel_type))
131                 return false;
132
133         return true;
134 }
135
136 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
137 {
138         struct ieee80211_channel *chan, *scan_chan;
139         int ret = 0;
140         int power;
141         enum nl80211_channel_type channel_type;
142         u32 offchannel_flag;
143
144         might_sleep();
145
146         scan_chan = local->scan_channel;
147
148         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
149          * may need to change as well.
150          */
151         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
152         if (scan_chan) {
153                 chan = scan_chan;
154                 channel_type = NL80211_CHAN_NO_HT;
155         } else if (local->tmp_channel) {
156                 chan = scan_chan = local->tmp_channel;
157                 channel_type = local->tmp_channel_type;
158         } else {
159                 chan = local->oper_channel;
160                 channel_type = local->_oper_channel_type;
161         }
162
163         if (chan != local->oper_channel ||
164             channel_type != local->_oper_channel_type)
165                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
166         else
167                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
168
169         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
170
171         if (offchannel_flag || chan != local->hw.conf.channel ||
172             channel_type != local->hw.conf.channel_type) {
173                 local->hw.conf.channel = chan;
174                 local->hw.conf.channel_type = channel_type;
175                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
176         }
177
178         if (!conf_is_ht(&local->hw.conf)) {
179                 /*
180                  * mac80211.h documents that this is only valid
181                  * when the channel is set to an HT type, and
182                  * that otherwise STATIC is used.
183                  */
184                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
185         } else if (local->hw.conf.smps_mode != local->smps_mode) {
186                 local->hw.conf.smps_mode = local->smps_mode;
187                 changed |= IEEE80211_CONF_CHANGE_SMPS;
188         }
189
190         if (scan_chan)
191                 power = chan->max_power;
192         else
193                 power = local->power_constr_level ?
194                         (chan->max_power - local->power_constr_level) :
195                         chan->max_power;
196
197         if (local->user_power_level >= 0)
198                 power = min(power, local->user_power_level);
199
200         if (local->hw.conf.power_level != power) {
201                 changed |= IEEE80211_CONF_CHANGE_POWER;
202                 local->hw.conf.power_level = power;
203         }
204
205         if (changed && local->open_count) {
206                 ret = drv_config(local, changed);
207                 /*
208                  * Goal:
209                  * HW reconfiguration should never fail, the driver has told
210                  * us what it can support so it should live up to that promise.
211                  *
212                  * Current status:
213                  * rfkill is not integrated with mac80211 and a
214                  * configuration command can thus fail if hardware rfkill
215                  * is enabled
216                  *
217                  * FIXME: integrate rfkill with mac80211 and then add this
218                  * WARN_ON() back
219                  *
220                  */
221                 /* WARN_ON(ret); */
222         }
223
224         return ret;
225 }
226
227 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
228                                       u32 changed)
229 {
230         struct ieee80211_local *local = sdata->local;
231         static const u8 zero[ETH_ALEN] = { 0 };
232
233         if (!changed)
234                 return;
235
236         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
237                 /*
238                  * While not associated, claim a BSSID of all-zeroes
239                  * so that drivers don't do any weird things with the
240                  * BSSID at that time.
241                  */
242                 if (sdata->vif.bss_conf.assoc)
243                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
244                 else
245                         sdata->vif.bss_conf.bssid = zero;
246         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
247                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
248         else if (sdata->vif.type == NL80211_IFTYPE_AP)
249                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
250         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
251                 sdata->vif.bss_conf.bssid = NULL;
252         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
253                 sdata->vif.bss_conf.bssid = zero;
254         } else {
255                 WARN_ON(1);
256                 return;
257         }
258
259         switch (sdata->vif.type) {
260         case NL80211_IFTYPE_AP:
261         case NL80211_IFTYPE_ADHOC:
262         case NL80211_IFTYPE_WDS:
263         case NL80211_IFTYPE_MESH_POINT:
264                 break;
265         default:
266                 /* do not warn to simplify caller in scan.c */
267                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
268                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
269                         return;
270                 break;
271         }
272
273         if (changed & BSS_CHANGED_BEACON_ENABLED) {
274                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
275                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
276                         sdata->vif.bss_conf.enable_beacon = false;
277                 } else {
278                         /*
279                          * Beacon should be enabled, but AP mode must
280                          * check whether there is a beacon configured.
281                          */
282                         switch (sdata->vif.type) {
283                         case NL80211_IFTYPE_AP:
284                                 sdata->vif.bss_conf.enable_beacon =
285                                         !!sdata->u.ap.beacon;
286                                 break;
287                         case NL80211_IFTYPE_ADHOC:
288                                 sdata->vif.bss_conf.enable_beacon =
289                                         !!sdata->u.ibss.presp;
290                                 break;
291 #ifdef CONFIG_MAC80211_MESH
292                         case NL80211_IFTYPE_MESH_POINT:
293                                 sdata->vif.bss_conf.enable_beacon =
294                                         !!sdata->u.mesh.mesh_id_len;
295                                 break;
296 #endif
297                         default:
298                                 /* not reached */
299                                 WARN_ON(1);
300                                 break;
301                         }
302                 }
303         }
304
305         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
306 }
307
308 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
309 {
310         sdata->vif.bss_conf.use_cts_prot = false;
311         sdata->vif.bss_conf.use_short_preamble = false;
312         sdata->vif.bss_conf.use_short_slot = false;
313         return BSS_CHANGED_ERP_CTS_PROT |
314                BSS_CHANGED_ERP_PREAMBLE |
315                BSS_CHANGED_ERP_SLOT;
316 }
317
318 static void ieee80211_tasklet_handler(unsigned long data)
319 {
320         struct ieee80211_local *local = (struct ieee80211_local *) data;
321         struct sk_buff *skb;
322
323         while ((skb = skb_dequeue(&local->skb_queue)) ||
324                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
325                 switch (skb->pkt_type) {
326                 case IEEE80211_RX_MSG:
327                         /* Clear skb->pkt_type in order to not confuse kernel
328                          * netstack. */
329                         skb->pkt_type = 0;
330                         ieee80211_rx(local_to_hw(local), skb);
331                         break;
332                 case IEEE80211_TX_STATUS_MSG:
333                         skb->pkt_type = 0;
334                         ieee80211_tx_status(local_to_hw(local), skb);
335                         break;
336                 default:
337                         WARN(1, "mac80211: Packet is of unknown type %d\n",
338                              skb->pkt_type);
339                         dev_kfree_skb(skb);
340                         break;
341                 }
342         }
343 }
344
345 static void ieee80211_restart_work(struct work_struct *work)
346 {
347         struct ieee80211_local *local =
348                 container_of(work, struct ieee80211_local, restart_work);
349
350         /* wait for scan work complete */
351         flush_workqueue(local->workqueue);
352
353         mutex_lock(&local->mtx);
354         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
355                 "%s called with hardware scan in progress\n", __func__);
356         mutex_unlock(&local->mtx);
357
358         rtnl_lock();
359         ieee80211_scan_cancel(local);
360         ieee80211_reconfig(local);
361         rtnl_unlock();
362 }
363
364 void ieee80211_restart_hw(struct ieee80211_hw *hw)
365 {
366         struct ieee80211_local *local = hw_to_local(hw);
367
368         trace_api_restart_hw(local);
369
370         /* use this reason, ieee80211_reconfig will unblock it */
371         ieee80211_stop_queues_by_reason(hw,
372                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
373
374         schedule_work(&local->restart_work);
375 }
376 EXPORT_SYMBOL(ieee80211_restart_hw);
377
378 static void ieee80211_recalc_smps_work(struct work_struct *work)
379 {
380         struct ieee80211_local *local =
381                 container_of(work, struct ieee80211_local, recalc_smps);
382
383         mutex_lock(&local->iflist_mtx);
384         ieee80211_recalc_smps(local);
385         mutex_unlock(&local->iflist_mtx);
386 }
387
388 #ifdef CONFIG_INET
389 static int ieee80211_ifa_changed(struct notifier_block *nb,
390                                  unsigned long data, void *arg)
391 {
392         struct in_ifaddr *ifa = arg;
393         struct ieee80211_local *local =
394                 container_of(nb, struct ieee80211_local,
395                              ifa_notifier);
396         struct net_device *ndev = ifa->ifa_dev->dev;
397         struct wireless_dev *wdev = ndev->ieee80211_ptr;
398         struct in_device *idev;
399         struct ieee80211_sub_if_data *sdata;
400         struct ieee80211_bss_conf *bss_conf;
401         struct ieee80211_if_managed *ifmgd;
402         int c = 0;
403
404         /* Make sure it's our interface that got changed */
405         if (!wdev)
406                 return NOTIFY_DONE;
407
408         if (wdev->wiphy != local->hw.wiphy)
409                 return NOTIFY_DONE;
410
411         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
412         bss_conf = &sdata->vif.bss_conf;
413
414         if (!ieee80211_sdata_running(sdata))
415                 return NOTIFY_DONE;
416
417         /* ARP filtering is only supported in managed mode */
418         if (sdata->vif.type != NL80211_IFTYPE_STATION)
419                 return NOTIFY_DONE;
420
421         idev = __in_dev_get_rtnl(sdata->dev);
422         if (!idev)
423                 return NOTIFY_DONE;
424
425         ifmgd = &sdata->u.mgd;
426         mutex_lock(&ifmgd->mtx);
427
428         /* Copy the addresses to the bss_conf list */
429         ifa = idev->ifa_list;
430         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
431                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
432                 ifa = ifa->ifa_next;
433                 c++;
434         }
435
436         /* If not all addresses fit the list, disable filtering */
437         if (ifa) {
438                 sdata->arp_filter_state = false;
439                 c = 0;
440         } else {
441                 sdata->arp_filter_state = true;
442         }
443         bss_conf->arp_addr_cnt = c;
444
445         /* Configure driver only if associated */
446         if (ifmgd->associated) {
447                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
448                 ieee80211_bss_info_change_notify(sdata,
449                                                  BSS_CHANGED_ARP_FILTER);
450         }
451
452         mutex_unlock(&ifmgd->mtx);
453
454         return NOTIFY_DONE;
455 }
456 #endif
457
458 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
459 {
460         struct ieee80211_local *local =
461                 container_of(napi, struct ieee80211_local, napi);
462
463         return local->ops->napi_poll(&local->hw, budget);
464 }
465
466 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
467 {
468         struct ieee80211_local *local = hw_to_local(hw);
469
470         napi_schedule(&local->napi);
471 }
472 EXPORT_SYMBOL(ieee80211_napi_schedule);
473
474 void ieee80211_napi_complete(struct ieee80211_hw *hw)
475 {
476         struct ieee80211_local *local = hw_to_local(hw);
477
478         napi_complete(&local->napi);
479 }
480 EXPORT_SYMBOL(ieee80211_napi_complete);
481
482 /* There isn't a lot of sense in it, but you can transmit anything you like */
483 static const struct ieee80211_txrx_stypes
484 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
485         [NL80211_IFTYPE_ADHOC] = {
486                 .tx = 0xffff,
487                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
488         },
489         [NL80211_IFTYPE_STATION] = {
490                 .tx = 0xffff,
491                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
492                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
493         },
494         [NL80211_IFTYPE_AP] = {
495                 .tx = 0xffff,
496                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
497                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
498                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
499                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
500                         BIT(IEEE80211_STYPE_AUTH >> 4) |
501                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
502                         BIT(IEEE80211_STYPE_ACTION >> 4),
503         },
504         [NL80211_IFTYPE_AP_VLAN] = {
505                 /* copy AP */
506                 .tx = 0xffff,
507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
513                         BIT(IEEE80211_STYPE_ACTION >> 4),
514         },
515         [NL80211_IFTYPE_P2P_CLIENT] = {
516                 .tx = 0xffff,
517                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
518                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
519         },
520         [NL80211_IFTYPE_P2P_GO] = {
521                 .tx = 0xffff,
522                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
523                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
524                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
525                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
526                         BIT(IEEE80211_STYPE_AUTH >> 4) |
527                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
528                         BIT(IEEE80211_STYPE_ACTION >> 4),
529         },
530         [NL80211_IFTYPE_MESH_POINT] = {
531                 .tx = 0xffff,
532                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
533         },
534 };
535
536 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
537                                         const struct ieee80211_ops *ops)
538 {
539         struct ieee80211_local *local;
540         int priv_size, i;
541         struct wiphy *wiphy;
542
543         /* Ensure 32-byte alignment of our private data and hw private data.
544          * We use the wiphy priv data for both our ieee80211_local and for
545          * the driver's private data
546          *
547          * In memory it'll be like this:
548          *
549          * +-------------------------+
550          * | struct wiphy           |
551          * +-------------------------+
552          * | struct ieee80211_local  |
553          * +-------------------------+
554          * | driver's private data   |
555          * +-------------------------+
556          *
557          */
558         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
559
560         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
561
562         if (!wiphy)
563                 return NULL;
564
565         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
566
567         wiphy->privid = mac80211_wiphy_privid;
568
569         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
570                         WIPHY_FLAG_4ADDR_AP |
571                         WIPHY_FLAG_4ADDR_STATION |
572                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
573
574         if (!ops->set_key)
575                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
576
577         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
578
579         local = wiphy_priv(wiphy);
580
581         local->hw.wiphy = wiphy;
582
583         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
584
585         BUG_ON(!ops->tx);
586         BUG_ON(!ops->start);
587         BUG_ON(!ops->stop);
588         BUG_ON(!ops->config);
589         BUG_ON(!ops->add_interface);
590         BUG_ON(!ops->remove_interface);
591         BUG_ON(!ops->configure_filter);
592         local->ops = ops;
593
594         /* set up some defaults */
595         local->hw.queues = 1;
596         local->hw.max_rates = 1;
597         local->hw.max_report_rates = 0;
598         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
599         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
600         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
601         local->user_power_level = -1;
602         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
603         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
604
605         INIT_LIST_HEAD(&local->interfaces);
606
607         __hw_addr_init(&local->mc_list);
608
609         mutex_init(&local->iflist_mtx);
610         mutex_init(&local->mtx);
611
612         mutex_init(&local->key_mtx);
613         spin_lock_init(&local->filter_lock);
614         spin_lock_init(&local->queue_stop_reason_lock);
615
616         /*
617          * The rx_skb_queue is only accessed from tasklets,
618          * but other SKB queues are used from within IRQ
619          * context. Therefore, this one needs a different
620          * locking class so our direct, non-irq-safe use of
621          * the queue's lock doesn't throw lockdep warnings.
622          */
623         skb_queue_head_init_class(&local->rx_skb_queue,
624                                   &ieee80211_rx_skb_queue_class);
625
626         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
627
628         ieee80211_work_init(local);
629
630         INIT_WORK(&local->restart_work, ieee80211_restart_work);
631
632         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
633         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
634         local->smps_mode = IEEE80211_SMPS_OFF;
635
636         INIT_WORK(&local->dynamic_ps_enable_work,
637                   ieee80211_dynamic_ps_enable_work);
638         INIT_WORK(&local->dynamic_ps_disable_work,
639                   ieee80211_dynamic_ps_disable_work);
640         setup_timer(&local->dynamic_ps_timer,
641                     ieee80211_dynamic_ps_timer, (unsigned long) local);
642
643         sta_info_init(local);
644
645         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
646                 skb_queue_head_init(&local->pending[i]);
647                 atomic_set(&local->agg_queue_stop[i], 0);
648         }
649         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
650                      (unsigned long)local);
651
652         tasklet_init(&local->tasklet,
653                      ieee80211_tasklet_handler,
654                      (unsigned long) local);
655
656         skb_queue_head_init(&local->skb_queue);
657         skb_queue_head_init(&local->skb_queue_unreliable);
658
659         /* init dummy netdev for use w/ NAPI */
660         init_dummy_netdev(&local->napi_dev);
661
662         ieee80211_led_names(local);
663
664         ieee80211_hw_roc_setup(local);
665
666         return local_to_hw(local);
667 }
668 EXPORT_SYMBOL(ieee80211_alloc_hw);
669
670 int ieee80211_register_hw(struct ieee80211_hw *hw)
671 {
672         struct ieee80211_local *local = hw_to_local(hw);
673         int result;
674         enum ieee80211_band band;
675         int channels, max_bitrates;
676         bool supp_ht;
677         static const u32 cipher_suites[] = {
678                 /* keep WEP first, it may be removed below */
679                 WLAN_CIPHER_SUITE_WEP40,
680                 WLAN_CIPHER_SUITE_WEP104,
681                 WLAN_CIPHER_SUITE_TKIP,
682                 WLAN_CIPHER_SUITE_CCMP,
683
684                 /* keep last -- depends on hw flags! */
685                 WLAN_CIPHER_SUITE_AES_CMAC
686         };
687
688         if (hw->max_report_rates == 0)
689                 hw->max_report_rates = hw->max_rates;
690
691         /*
692          * generic code guarantees at least one band,
693          * set this very early because much code assumes
694          * that hw.conf.channel is assigned
695          */
696         channels = 0;
697         max_bitrates = 0;
698         supp_ht = false;
699         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
700                 struct ieee80211_supported_band *sband;
701
702                 sband = local->hw.wiphy->bands[band];
703                 if (!sband)
704                         continue;
705                 if (!local->oper_channel) {
706                         /* init channel we're on */
707                         local->hw.conf.channel =
708                         local->oper_channel = &sband->channels[0];
709                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
710                 }
711                 channels += sband->n_channels;
712
713                 if (max_bitrates < sband->n_bitrates)
714                         max_bitrates = sband->n_bitrates;
715                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
716         }
717
718         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
719                                       sizeof(void *) * channels, GFP_KERNEL);
720         if (!local->int_scan_req)
721                 return -ENOMEM;
722
723         /* if low-level driver supports AP, we also support VLAN */
724         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
725                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
726
727         /* mac80211 always supports monitor */
728         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
729
730 #ifndef CONFIG_MAC80211_MESH
731         /* mesh depends on Kconfig, but drivers should set it if they want */
732         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
733 #endif
734
735         /* mac80211 supports control port protocol changing */
736         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
737
738         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
739                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
740         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
741                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
742
743         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
744              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
745              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
746
747         /*
748          * Calculate scan IE length -- we need this to alloc
749          * memory and to subtract from the driver limit. It
750          * includes the DS Params, (extended) supported rates, and HT
751          * information -- SSID is the driver's responsibility.
752          */
753         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
754                 3 /* DS Params */;
755         if (supp_ht)
756                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
757
758         if (!local->ops->hw_scan) {
759                 /* For hw_scan, driver needs to set these up. */
760                 local->hw.wiphy->max_scan_ssids = 4;
761                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
762         }
763
764         /*
765          * If the driver supports any scan IEs, then assume the
766          * limit includes the IEs mac80211 will add, otherwise
767          * leave it at zero and let the driver sort it out; we
768          * still pass our IEs to the driver but userspace will
769          * not be allowed to in that case.
770          */
771         if (local->hw.wiphy->max_scan_ie_len)
772                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
773
774         /* Set up cipher suites unless driver already did */
775         if (!local->hw.wiphy->cipher_suites) {
776                 local->hw.wiphy->cipher_suites = cipher_suites;
777                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
778                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
779                         local->hw.wiphy->n_cipher_suites--;
780         }
781         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
782                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
783                         local->hw.wiphy->cipher_suites += 2;
784                         local->hw.wiphy->n_cipher_suites -= 2;
785                 } else {
786                         u32 *suites;
787                         int r, w = 0;
788
789                         /* Filter out WEP */
790
791                         suites = kmemdup(
792                                 local->hw.wiphy->cipher_suites,
793                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
794                                 GFP_KERNEL);
795                         if (!suites)
796                                 return -ENOMEM;
797                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
798                                 u32 suite = local->hw.wiphy->cipher_suites[r];
799                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
800                                     suite == WLAN_CIPHER_SUITE_WEP104)
801                                         continue;
802                                 suites[w++] = suite;
803                         }
804                         local->hw.wiphy->cipher_suites = suites;
805                         local->hw.wiphy->n_cipher_suites = w;
806                         local->wiphy_ciphers_allocated = true;
807                 }
808         }
809
810         if (!local->ops->remain_on_channel)
811                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
812
813         result = wiphy_register(local->hw.wiphy);
814         if (result < 0)
815                 goto fail_wiphy_register;
816
817         /*
818          * We use the number of queues for feature tests (QoS, HT) internally
819          * so restrict them appropriately.
820          */
821         if (hw->queues > IEEE80211_MAX_QUEUES)
822                 hw->queues = IEEE80211_MAX_QUEUES;
823
824         local->workqueue =
825                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
826         if (!local->workqueue) {
827                 result = -ENOMEM;
828                 goto fail_workqueue;
829         }
830
831         /*
832          * The hardware needs headroom for sending the frame,
833          * and we need some headroom for passing the frame to monitor
834          * interfaces, but never both at the same time.
835          */
836         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
837                         sizeof(struct ieee80211_tx_status_rtap_hdr));
838         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
839                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
840
841         debugfs_hw_add(local);
842
843         /*
844          * if the driver doesn't specify a max listen interval we
845          * use 5 which should be a safe default
846          */
847         if (local->hw.max_listen_interval == 0)
848                 local->hw.max_listen_interval = 5;
849
850         local->hw.conf.listen_interval = local->hw.max_listen_interval;
851
852         local->dynamic_ps_forced_timeout = -1;
853
854         result = sta_info_start(local);
855         if (result < 0)
856                 goto fail_sta_info;
857
858         result = ieee80211_wep_init(local);
859         if (result < 0)
860                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
861                             result);
862
863         rtnl_lock();
864
865         result = ieee80211_init_rate_ctrl_alg(local,
866                                               hw->rate_control_algorithm);
867         if (result < 0) {
868                 wiphy_debug(local->hw.wiphy,
869                             "Failed to initialize rate control algorithm\n");
870                 goto fail_rate;
871         }
872
873         /* add one default STA interface if supported */
874         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
875                 result = ieee80211_if_add(local, "wlan%d", NULL,
876                                           NL80211_IFTYPE_STATION, NULL);
877                 if (result)
878                         wiphy_warn(local->hw.wiphy,
879                                    "Failed to add default virtual iface\n");
880         }
881
882         rtnl_unlock();
883
884         ieee80211_led_init(local);
885
886         local->network_latency_notifier.notifier_call =
887                 ieee80211_max_network_latency;
888         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
889                                      &local->network_latency_notifier);
890         if (result) {
891                 rtnl_lock();
892                 goto fail_pm_qos;
893         }
894
895 #ifdef CONFIG_INET
896         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
897         result = register_inetaddr_notifier(&local->ifa_notifier);
898         if (result)
899                 goto fail_ifa;
900 #endif
901
902         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
903                         local->hw.napi_weight);
904
905         return 0;
906
907 #ifdef CONFIG_INET
908  fail_ifa:
909         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
910                                &local->network_latency_notifier);
911         rtnl_lock();
912 #endif
913  fail_pm_qos:
914         ieee80211_led_exit(local);
915         ieee80211_remove_interfaces(local);
916  fail_rate:
917         rtnl_unlock();
918         ieee80211_wep_free(local);
919         sta_info_stop(local);
920  fail_sta_info:
921         destroy_workqueue(local->workqueue);
922  fail_workqueue:
923         wiphy_unregister(local->hw.wiphy);
924  fail_wiphy_register:
925         if (local->wiphy_ciphers_allocated)
926                 kfree(local->hw.wiphy->cipher_suites);
927         kfree(local->int_scan_req);
928         return result;
929 }
930 EXPORT_SYMBOL(ieee80211_register_hw);
931
932 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
933 {
934         struct ieee80211_local *local = hw_to_local(hw);
935
936         tasklet_kill(&local->tx_pending_tasklet);
937         tasklet_kill(&local->tasklet);
938
939         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
940                                &local->network_latency_notifier);
941 #ifdef CONFIG_INET
942         unregister_inetaddr_notifier(&local->ifa_notifier);
943 #endif
944
945         rtnl_lock();
946
947         /*
948          * At this point, interface list manipulations are fine
949          * because the driver cannot be handing us frames any
950          * more and the tasklet is killed.
951          */
952         ieee80211_remove_interfaces(local);
953
954         rtnl_unlock();
955
956         /*
957          * Now all work items will be gone, but the
958          * timer might still be armed, so delete it
959          */
960         del_timer_sync(&local->work_timer);
961
962         cancel_work_sync(&local->restart_work);
963         cancel_work_sync(&local->reconfig_filter);
964
965         ieee80211_clear_tx_pending(local);
966         sta_info_stop(local);
967         rate_control_deinitialize(local);
968
969         if (skb_queue_len(&local->skb_queue) ||
970             skb_queue_len(&local->skb_queue_unreliable))
971                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
972         skb_queue_purge(&local->skb_queue);
973         skb_queue_purge(&local->skb_queue_unreliable);
974         skb_queue_purge(&local->rx_skb_queue);
975
976         destroy_workqueue(local->workqueue);
977         wiphy_unregister(local->hw.wiphy);
978         ieee80211_wep_free(local);
979         ieee80211_led_exit(local);
980         kfree(local->int_scan_req);
981 }
982 EXPORT_SYMBOL(ieee80211_unregister_hw);
983
984 void ieee80211_free_hw(struct ieee80211_hw *hw)
985 {
986         struct ieee80211_local *local = hw_to_local(hw);
987
988         mutex_destroy(&local->iflist_mtx);
989         mutex_destroy(&local->mtx);
990
991         if (local->wiphy_ciphers_allocated)
992                 kfree(local->hw.wiphy->cipher_suites);
993
994         wiphy_free(local->hw.wiphy);
995 }
996 EXPORT_SYMBOL(ieee80211_free_hw);
997
998 static int __init ieee80211_init(void)
999 {
1000         struct sk_buff *skb;
1001         int ret;
1002
1003         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1004         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1005                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1006
1007         ret = rc80211_minstrel_init();
1008         if (ret)
1009                 return ret;
1010
1011         ret = rc80211_minstrel_ht_init();
1012         if (ret)
1013                 goto err_minstrel;
1014
1015         ret = rc80211_pid_init();
1016         if (ret)
1017                 goto err_pid;
1018
1019         ret = ieee80211_iface_init();
1020         if (ret)
1021                 goto err_netdev;
1022
1023         return 0;
1024  err_netdev:
1025         rc80211_pid_exit();
1026  err_pid:
1027         rc80211_minstrel_ht_exit();
1028  err_minstrel:
1029         rc80211_minstrel_exit();
1030
1031         return ret;
1032 }
1033
1034 static void __exit ieee80211_exit(void)
1035 {
1036         rc80211_pid_exit();
1037         rc80211_minstrel_ht_exit();
1038         rc80211_minstrel_exit();
1039
1040         if (mesh_allocated)
1041                 ieee80211s_stop();
1042
1043         ieee80211_iface_exit();
1044 }
1045
1046
1047 subsys_initcall(ieee80211_init);
1048 module_exit(ieee80211_exit);
1049
1050 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1051 MODULE_LICENSE("GPL");