mac80211: send notification on new peer candidate for our secure mesh
[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 static 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                 /* If scanning on oper channel, use whatever channel-type
116                  * is currently in use.
117                  */
118                 if (chan == local->oper_channel)
119                         channel_type = local->_oper_channel_type;
120                 else
121                         channel_type = NL80211_CHAN_NO_HT;
122         } else if (local->tmp_channel) {
123                 chan = scan_chan = local->tmp_channel;
124                 channel_type = local->tmp_channel_type;
125         } else {
126                 chan = local->oper_channel;
127                 channel_type = local->_oper_channel_type;
128         }
129
130         if (chan != local->oper_channel ||
131             channel_type != local->_oper_channel_type)
132                 return false;
133
134         /* Check current hardware-config against oper_channel. */
135         if ((local->oper_channel != local->hw.conf.channel) ||
136             (local->_oper_channel_type != local->hw.conf.channel_type))
137                 return false;
138
139         return true;
140 }
141
142 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
143 {
144         struct ieee80211_channel *chan, *scan_chan;
145         int ret = 0;
146         int power;
147         enum nl80211_channel_type channel_type;
148         u32 offchannel_flag;
149
150         might_sleep();
151
152         scan_chan = local->scan_channel;
153
154         /* If this off-channel logic ever changes,  ieee80211_on_oper_channel
155          * may need to change as well.
156          */
157         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
158         if (scan_chan) {
159                 chan = scan_chan;
160                 /* If scanning on oper channel, use whatever channel-type
161                  * is currently in use.
162                  */
163                 if (chan == local->oper_channel)
164                         channel_type = local->_oper_channel_type;
165                 else
166                         channel_type = NL80211_CHAN_NO_HT;
167         } else if (local->tmp_channel) {
168                 chan = scan_chan = local->tmp_channel;
169                 channel_type = local->tmp_channel_type;
170         } else {
171                 chan = local->oper_channel;
172                 channel_type = local->_oper_channel_type;
173         }
174
175         if (chan != local->oper_channel ||
176             channel_type != local->_oper_channel_type)
177                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
178         else
179                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
180
181         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
182
183         if (offchannel_flag || chan != local->hw.conf.channel ||
184             channel_type != local->hw.conf.channel_type) {
185                 local->hw.conf.channel = chan;
186                 local->hw.conf.channel_type = channel_type;
187                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
188         }
189
190         if (!conf_is_ht(&local->hw.conf)) {
191                 /*
192                  * mac80211.h documents that this is only valid
193                  * when the channel is set to an HT type, and
194                  * that otherwise STATIC is used.
195                  */
196                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
197         } else if (local->hw.conf.smps_mode != local->smps_mode) {
198                 local->hw.conf.smps_mode = local->smps_mode;
199                 changed |= IEEE80211_CONF_CHANGE_SMPS;
200         }
201
202         if ((local->scanning & SCAN_SW_SCANNING) ||
203             (local->scanning & SCAN_HW_SCANNING))
204                 power = chan->max_power;
205         else
206                 power = local->power_constr_level ?
207                         (chan->max_power - local->power_constr_level) :
208                         chan->max_power;
209
210         if (local->user_power_level >= 0)
211                 power = min(power, local->user_power_level);
212
213         if (local->hw.conf.power_level != power) {
214                 changed |= IEEE80211_CONF_CHANGE_POWER;
215                 local->hw.conf.power_level = power;
216         }
217
218         if (changed && local->open_count) {
219                 ret = drv_config(local, changed);
220                 /*
221                  * Goal:
222                  * HW reconfiguration should never fail, the driver has told
223                  * us what it can support so it should live up to that promise.
224                  *
225                  * Current status:
226                  * rfkill is not integrated with mac80211 and a
227                  * configuration command can thus fail if hardware rfkill
228                  * is enabled
229                  *
230                  * FIXME: integrate rfkill with mac80211 and then add this
231                  * WARN_ON() back
232                  *
233                  */
234                 /* WARN_ON(ret); */
235         }
236
237         return ret;
238 }
239
240 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
241                                       u32 changed)
242 {
243         struct ieee80211_local *local = sdata->local;
244         static const u8 zero[ETH_ALEN] = { 0 };
245
246         if (!changed)
247                 return;
248
249         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
250                 /*
251                  * While not associated, claim a BSSID of all-zeroes
252                  * so that drivers don't do any weird things with the
253                  * BSSID at that time.
254                  */
255                 if (sdata->vif.bss_conf.assoc)
256                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
257                 else
258                         sdata->vif.bss_conf.bssid = zero;
259         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
260                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
261         else if (sdata->vif.type == NL80211_IFTYPE_AP)
262                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
263         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
264                 sdata->vif.bss_conf.bssid = NULL;
265         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
266                 sdata->vif.bss_conf.bssid = zero;
267         } else {
268                 WARN_ON(1);
269                 return;
270         }
271
272         switch (sdata->vif.type) {
273         case NL80211_IFTYPE_AP:
274         case NL80211_IFTYPE_ADHOC:
275         case NL80211_IFTYPE_WDS:
276         case NL80211_IFTYPE_MESH_POINT:
277                 break;
278         default:
279                 /* do not warn to simplify caller in scan.c */
280                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
281                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
282                         return;
283                 break;
284         }
285
286         if (changed & BSS_CHANGED_BEACON_ENABLED) {
287                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
288                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
289                         sdata->vif.bss_conf.enable_beacon = false;
290                 } else {
291                         /*
292                          * Beacon should be enabled, but AP mode must
293                          * check whether there is a beacon configured.
294                          */
295                         switch (sdata->vif.type) {
296                         case NL80211_IFTYPE_AP:
297                                 sdata->vif.bss_conf.enable_beacon =
298                                         !!sdata->u.ap.beacon;
299                                 break;
300                         case NL80211_IFTYPE_ADHOC:
301                                 sdata->vif.bss_conf.enable_beacon =
302                                         !!sdata->u.ibss.presp;
303                                 break;
304 #ifdef CONFIG_MAC80211_MESH
305                         case NL80211_IFTYPE_MESH_POINT:
306                                 sdata->vif.bss_conf.enable_beacon =
307                                         !!sdata->u.mesh.mesh_id_len;
308                                 break;
309 #endif
310                         default:
311                                 /* not reached */
312                                 WARN_ON(1);
313                                 break;
314                         }
315                 }
316         }
317
318         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
319 }
320
321 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
322 {
323         sdata->vif.bss_conf.use_cts_prot = false;
324         sdata->vif.bss_conf.use_short_preamble = false;
325         sdata->vif.bss_conf.use_short_slot = false;
326         return BSS_CHANGED_ERP_CTS_PROT |
327                BSS_CHANGED_ERP_PREAMBLE |
328                BSS_CHANGED_ERP_SLOT;
329 }
330
331 static void ieee80211_tasklet_handler(unsigned long data)
332 {
333         struct ieee80211_local *local = (struct ieee80211_local *) data;
334         struct sk_buff *skb;
335
336         while ((skb = skb_dequeue(&local->skb_queue)) ||
337                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
338                 switch (skb->pkt_type) {
339                 case IEEE80211_RX_MSG:
340                         /* Clear skb->pkt_type in order to not confuse kernel
341                          * netstack. */
342                         skb->pkt_type = 0;
343                         ieee80211_rx(local_to_hw(local), skb);
344                         break;
345                 case IEEE80211_TX_STATUS_MSG:
346                         skb->pkt_type = 0;
347                         ieee80211_tx_status(local_to_hw(local), skb);
348                         break;
349                 default:
350                         WARN(1, "mac80211: Packet is of unknown type %d\n",
351                              skb->pkt_type);
352                         dev_kfree_skb(skb);
353                         break;
354                 }
355         }
356 }
357
358 static void ieee80211_restart_work(struct work_struct *work)
359 {
360         struct ieee80211_local *local =
361                 container_of(work, struct ieee80211_local, restart_work);
362
363         /* wait for scan work complete */
364         flush_workqueue(local->workqueue);
365
366         mutex_lock(&local->mtx);
367         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
368                 "%s called with hardware scan in progress\n", __func__);
369         mutex_unlock(&local->mtx);
370
371         rtnl_lock();
372         ieee80211_scan_cancel(local);
373         ieee80211_reconfig(local);
374         rtnl_unlock();
375 }
376
377 void ieee80211_restart_hw(struct ieee80211_hw *hw)
378 {
379         struct ieee80211_local *local = hw_to_local(hw);
380
381         trace_api_restart_hw(local);
382
383         wiphy_info(hw->wiphy,
384                    "Hardware restart was requested\n");
385
386         /* use this reason, ieee80211_reconfig will unblock it */
387         ieee80211_stop_queues_by_reason(hw,
388                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
389
390         schedule_work(&local->restart_work);
391 }
392 EXPORT_SYMBOL(ieee80211_restart_hw);
393
394 static void ieee80211_recalc_smps_work(struct work_struct *work)
395 {
396         struct ieee80211_local *local =
397                 container_of(work, struct ieee80211_local, recalc_smps);
398
399         mutex_lock(&local->iflist_mtx);
400         ieee80211_recalc_smps(local);
401         mutex_unlock(&local->iflist_mtx);
402 }
403
404 #ifdef CONFIG_INET
405 static int ieee80211_ifa_changed(struct notifier_block *nb,
406                                  unsigned long data, void *arg)
407 {
408         struct in_ifaddr *ifa = arg;
409         struct ieee80211_local *local =
410                 container_of(nb, struct ieee80211_local,
411                              ifa_notifier);
412         struct net_device *ndev = ifa->ifa_dev->dev;
413         struct wireless_dev *wdev = ndev->ieee80211_ptr;
414         struct in_device *idev;
415         struct ieee80211_sub_if_data *sdata;
416         struct ieee80211_bss_conf *bss_conf;
417         struct ieee80211_if_managed *ifmgd;
418         int c = 0;
419
420         /* Make sure it's our interface that got changed */
421         if (!wdev)
422                 return NOTIFY_DONE;
423
424         if (wdev->wiphy != local->hw.wiphy)
425                 return NOTIFY_DONE;
426
427         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
428         bss_conf = &sdata->vif.bss_conf;
429
430         if (!ieee80211_sdata_running(sdata))
431                 return NOTIFY_DONE;
432
433         /* ARP filtering is only supported in managed mode */
434         if (sdata->vif.type != NL80211_IFTYPE_STATION)
435                 return NOTIFY_DONE;
436
437         idev = __in_dev_get_rtnl(sdata->dev);
438         if (!idev)
439                 return NOTIFY_DONE;
440
441         ifmgd = &sdata->u.mgd;
442         mutex_lock(&ifmgd->mtx);
443
444         /* Copy the addresses to the bss_conf list */
445         ifa = idev->ifa_list;
446         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
447                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
448                 ifa = ifa->ifa_next;
449                 c++;
450         }
451
452         /* If not all addresses fit the list, disable filtering */
453         if (ifa) {
454                 sdata->arp_filter_state = false;
455                 c = 0;
456         } else {
457                 sdata->arp_filter_state = true;
458         }
459         bss_conf->arp_addr_cnt = c;
460
461         /* Configure driver only if associated */
462         if (ifmgd->associated) {
463                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
464                 ieee80211_bss_info_change_notify(sdata,
465                                                  BSS_CHANGED_ARP_FILTER);
466         }
467
468         mutex_unlock(&ifmgd->mtx);
469
470         return NOTIFY_DONE;
471 }
472 #endif
473
474 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
475 {
476         struct ieee80211_local *local =
477                 container_of(napi, struct ieee80211_local, napi);
478
479         return local->ops->napi_poll(&local->hw, budget);
480 }
481
482 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
483 {
484         struct ieee80211_local *local = hw_to_local(hw);
485
486         napi_schedule(&local->napi);
487 }
488 EXPORT_SYMBOL(ieee80211_napi_schedule);
489
490 void ieee80211_napi_complete(struct ieee80211_hw *hw)
491 {
492         struct ieee80211_local *local = hw_to_local(hw);
493
494         napi_complete(&local->napi);
495 }
496 EXPORT_SYMBOL(ieee80211_napi_complete);
497
498 /* There isn't a lot of sense in it, but you can transmit anything you like */
499 static const struct ieee80211_txrx_stypes
500 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
501         [NL80211_IFTYPE_ADHOC] = {
502                 .tx = 0xffff,
503                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
504         },
505         [NL80211_IFTYPE_STATION] = {
506                 .tx = 0xffff,
507                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
508                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
509         },
510         [NL80211_IFTYPE_AP] = {
511                 .tx = 0xffff,
512                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
513                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
514                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
515                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
516                         BIT(IEEE80211_STYPE_AUTH >> 4) |
517                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
518                         BIT(IEEE80211_STYPE_ACTION >> 4),
519         },
520         [NL80211_IFTYPE_AP_VLAN] = {
521                 /* copy AP */
522                 .tx = 0xffff,
523                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
524                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
525                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
526                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
527                         BIT(IEEE80211_STYPE_AUTH >> 4) |
528                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
529                         BIT(IEEE80211_STYPE_ACTION >> 4),
530         },
531         [NL80211_IFTYPE_P2P_CLIENT] = {
532                 .tx = 0xffff,
533                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
534                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
535         },
536         [NL80211_IFTYPE_P2P_GO] = {
537                 .tx = 0xffff,
538                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
539                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
540                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
541                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
542                         BIT(IEEE80211_STYPE_AUTH >> 4) |
543                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
544                         BIT(IEEE80211_STYPE_ACTION >> 4),
545         },
546         [NL80211_IFTYPE_MESH_POINT] = {
547                 .tx = 0xffff,
548                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
549                         BIT(IEEE80211_STYPE_AUTH >> 4) |
550                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
551         },
552 };
553
554 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
555                                         const struct ieee80211_ops *ops)
556 {
557         struct ieee80211_local *local;
558         int priv_size, i;
559         struct wiphy *wiphy;
560
561         /* Ensure 32-byte alignment of our private data and hw private data.
562          * We use the wiphy priv data for both our ieee80211_local and for
563          * the driver's private data
564          *
565          * In memory it'll be like this:
566          *
567          * +-------------------------+
568          * | struct wiphy           |
569          * +-------------------------+
570          * | struct ieee80211_local  |
571          * +-------------------------+
572          * | driver's private data   |
573          * +-------------------------+
574          *
575          */
576         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
577
578         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
579
580         if (!wiphy)
581                 return NULL;
582
583         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
584
585         wiphy->privid = mac80211_wiphy_privid;
586
587         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
588                         WIPHY_FLAG_4ADDR_AP |
589                         WIPHY_FLAG_4ADDR_STATION |
590                         WIPHY_FLAG_SUPPORTS_SEPARATE_DEFAULT_KEYS;
591
592         if (!ops->set_key)
593                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
594
595         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
596
597         local = wiphy_priv(wiphy);
598
599         local->hw.wiphy = wiphy;
600
601         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
602
603         BUG_ON(!ops->tx);
604         BUG_ON(!ops->start);
605         BUG_ON(!ops->stop);
606         BUG_ON(!ops->config);
607         BUG_ON(!ops->add_interface);
608         BUG_ON(!ops->remove_interface);
609         BUG_ON(!ops->configure_filter);
610         local->ops = ops;
611
612         /* set up some defaults */
613         local->hw.queues = 1;
614         local->hw.max_rates = 1;
615         local->hw.max_report_rates = 0;
616         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
617         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
618         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
619         local->user_power_level = -1;
620         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
621         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
622
623         INIT_LIST_HEAD(&local->interfaces);
624
625         __hw_addr_init(&local->mc_list);
626
627         mutex_init(&local->iflist_mtx);
628         mutex_init(&local->mtx);
629
630         mutex_init(&local->key_mtx);
631         spin_lock_init(&local->filter_lock);
632         spin_lock_init(&local->queue_stop_reason_lock);
633
634         /*
635          * The rx_skb_queue is only accessed from tasklets,
636          * but other SKB queues are used from within IRQ
637          * context. Therefore, this one needs a different
638          * locking class so our direct, non-irq-safe use of
639          * the queue's lock doesn't throw lockdep warnings.
640          */
641         skb_queue_head_init_class(&local->rx_skb_queue,
642                                   &ieee80211_rx_skb_queue_class);
643
644         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
645
646         ieee80211_work_init(local);
647
648         INIT_WORK(&local->restart_work, ieee80211_restart_work);
649
650         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
651         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
652         local->smps_mode = IEEE80211_SMPS_OFF;
653
654         INIT_WORK(&local->dynamic_ps_enable_work,
655                   ieee80211_dynamic_ps_enable_work);
656         INIT_WORK(&local->dynamic_ps_disable_work,
657                   ieee80211_dynamic_ps_disable_work);
658         setup_timer(&local->dynamic_ps_timer,
659                     ieee80211_dynamic_ps_timer, (unsigned long) local);
660
661         sta_info_init(local);
662
663         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
664                 skb_queue_head_init(&local->pending[i]);
665                 atomic_set(&local->agg_queue_stop[i], 0);
666         }
667         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
668                      (unsigned long)local);
669
670         tasklet_init(&local->tasklet,
671                      ieee80211_tasklet_handler,
672                      (unsigned long) local);
673
674         skb_queue_head_init(&local->skb_queue);
675         skb_queue_head_init(&local->skb_queue_unreliable);
676
677         /* init dummy netdev for use w/ NAPI */
678         init_dummy_netdev(&local->napi_dev);
679
680         ieee80211_led_names(local);
681
682         ieee80211_hw_roc_setup(local);
683
684         return local_to_hw(local);
685 }
686 EXPORT_SYMBOL(ieee80211_alloc_hw);
687
688 int ieee80211_register_hw(struct ieee80211_hw *hw)
689 {
690         struct ieee80211_local *local = hw_to_local(hw);
691         int result;
692         enum ieee80211_band band;
693         int channels, max_bitrates;
694         bool supp_ht;
695         static const u32 cipher_suites[] = {
696                 /* keep WEP first, it may be removed below */
697                 WLAN_CIPHER_SUITE_WEP40,
698                 WLAN_CIPHER_SUITE_WEP104,
699                 WLAN_CIPHER_SUITE_TKIP,
700                 WLAN_CIPHER_SUITE_CCMP,
701
702                 /* keep last -- depends on hw flags! */
703                 WLAN_CIPHER_SUITE_AES_CMAC
704         };
705
706         if (hw->max_report_rates == 0)
707                 hw->max_report_rates = hw->max_rates;
708
709         /*
710          * generic code guarantees at least one band,
711          * set this very early because much code assumes
712          * that hw.conf.channel is assigned
713          */
714         channels = 0;
715         max_bitrates = 0;
716         supp_ht = false;
717         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
718                 struct ieee80211_supported_band *sband;
719
720                 sband = local->hw.wiphy->bands[band];
721                 if (!sband)
722                         continue;
723                 if (!local->oper_channel) {
724                         /* init channel we're on */
725                         local->hw.conf.channel =
726                         local->oper_channel = &sband->channels[0];
727                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
728                 }
729                 channels += sband->n_channels;
730
731                 /*
732                  * Since ieee80211_disable_40mhz_24ghz is global, we can
733                  * modify the sband's ht data even if the driver uses a
734                  * global structure for that.
735                  */
736                 if (ieee80211_disable_40mhz_24ghz &&
737                     band == IEEE80211_BAND_2GHZ &&
738                     sband->ht_cap.ht_supported) {
739                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
740                         sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
741                 }
742
743                 if (max_bitrates < sband->n_bitrates)
744                         max_bitrates = sband->n_bitrates;
745                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
746         }
747
748         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
749                                       sizeof(void *) * channels, GFP_KERNEL);
750         if (!local->int_scan_req)
751                 return -ENOMEM;
752
753         /* if low-level driver supports AP, we also support VLAN */
754         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
755                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
756
757         /* mac80211 always supports monitor */
758         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
759
760 #ifndef CONFIG_MAC80211_MESH
761         /* mesh depends on Kconfig, but drivers should set it if they want */
762         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
763 #endif
764
765         /* if the underlying driver supports mesh, mac80211 will (at least)
766          * provide routing of mesh authentication frames to userspace */
767         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
768                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
769
770         /* mac80211 supports control port protocol changing */
771         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
772
773         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
774                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
775         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
776                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
777
778         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
779              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
780              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
781
782         /*
783          * Calculate scan IE length -- we need this to alloc
784          * memory and to subtract from the driver limit. It
785          * includes the DS Params, (extended) supported rates, and HT
786          * information -- SSID is the driver's responsibility.
787          */
788         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
789                 3 /* DS Params */;
790         if (supp_ht)
791                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
792
793         if (!local->ops->hw_scan) {
794                 /* For hw_scan, driver needs to set these up. */
795                 local->hw.wiphy->max_scan_ssids = 4;
796                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
797         }
798
799         /*
800          * If the driver supports any scan IEs, then assume the
801          * limit includes the IEs mac80211 will add, otherwise
802          * leave it at zero and let the driver sort it out; we
803          * still pass our IEs to the driver but userspace will
804          * not be allowed to in that case.
805          */
806         if (local->hw.wiphy->max_scan_ie_len)
807                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
808
809         /* Set up cipher suites unless driver already did */
810         if (!local->hw.wiphy->cipher_suites) {
811                 local->hw.wiphy->cipher_suites = cipher_suites;
812                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
813                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
814                         local->hw.wiphy->n_cipher_suites--;
815         }
816         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
817                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
818                         local->hw.wiphy->cipher_suites += 2;
819                         local->hw.wiphy->n_cipher_suites -= 2;
820                 } else {
821                         u32 *suites;
822                         int r, w = 0;
823
824                         /* Filter out WEP */
825
826                         suites = kmemdup(
827                                 local->hw.wiphy->cipher_suites,
828                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
829                                 GFP_KERNEL);
830                         if (!suites)
831                                 return -ENOMEM;
832                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
833                                 u32 suite = local->hw.wiphy->cipher_suites[r];
834                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
835                                     suite == WLAN_CIPHER_SUITE_WEP104)
836                                         continue;
837                                 suites[w++] = suite;
838                         }
839                         local->hw.wiphy->cipher_suites = suites;
840                         local->hw.wiphy->n_cipher_suites = w;
841                         local->wiphy_ciphers_allocated = true;
842                 }
843         }
844
845         if (!local->ops->remain_on_channel)
846                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
847
848         result = wiphy_register(local->hw.wiphy);
849         if (result < 0)
850                 goto fail_wiphy_register;
851
852         /*
853          * We use the number of queues for feature tests (QoS, HT) internally
854          * so restrict them appropriately.
855          */
856         if (hw->queues > IEEE80211_MAX_QUEUES)
857                 hw->queues = IEEE80211_MAX_QUEUES;
858
859         local->workqueue =
860                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
861         if (!local->workqueue) {
862                 result = -ENOMEM;
863                 goto fail_workqueue;
864         }
865
866         /*
867          * The hardware needs headroom for sending the frame,
868          * and we need some headroom for passing the frame to monitor
869          * interfaces, but never both at the same time.
870          */
871         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
872                         sizeof(struct ieee80211_tx_status_rtap_hdr));
873         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
874                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
875
876         debugfs_hw_add(local);
877
878         /*
879          * if the driver doesn't specify a max listen interval we
880          * use 5 which should be a safe default
881          */
882         if (local->hw.max_listen_interval == 0)
883                 local->hw.max_listen_interval = 5;
884
885         local->hw.conf.listen_interval = local->hw.max_listen_interval;
886
887         local->dynamic_ps_forced_timeout = -1;
888
889         result = ieee80211_wep_init(local);
890         if (result < 0)
891                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
892                             result);
893
894         rtnl_lock();
895
896         result = ieee80211_init_rate_ctrl_alg(local,
897                                               hw->rate_control_algorithm);
898         if (result < 0) {
899                 wiphy_debug(local->hw.wiphy,
900                             "Failed to initialize rate control algorithm\n");
901                 goto fail_rate;
902         }
903
904         /* add one default STA interface if supported */
905         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
906                 result = ieee80211_if_add(local, "wlan%d", NULL,
907                                           NL80211_IFTYPE_STATION, NULL);
908                 if (result)
909                         wiphy_warn(local->hw.wiphy,
910                                    "Failed to add default virtual iface\n");
911         }
912
913         rtnl_unlock();
914
915         ieee80211_led_init(local);
916
917         local->network_latency_notifier.notifier_call =
918                 ieee80211_max_network_latency;
919         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
920                                      &local->network_latency_notifier);
921         if (result) {
922                 rtnl_lock();
923                 goto fail_pm_qos;
924         }
925
926 #ifdef CONFIG_INET
927         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
928         result = register_inetaddr_notifier(&local->ifa_notifier);
929         if (result)
930                 goto fail_ifa;
931 #endif
932
933         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
934                         local->hw.napi_weight);
935
936         return 0;
937
938 #ifdef CONFIG_INET
939  fail_ifa:
940         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
941                                &local->network_latency_notifier);
942         rtnl_lock();
943 #endif
944  fail_pm_qos:
945         ieee80211_led_exit(local);
946         ieee80211_remove_interfaces(local);
947  fail_rate:
948         rtnl_unlock();
949         ieee80211_wep_free(local);
950         sta_info_stop(local);
951         destroy_workqueue(local->workqueue);
952  fail_workqueue:
953         wiphy_unregister(local->hw.wiphy);
954  fail_wiphy_register:
955         if (local->wiphy_ciphers_allocated)
956                 kfree(local->hw.wiphy->cipher_suites);
957         kfree(local->int_scan_req);
958         return result;
959 }
960 EXPORT_SYMBOL(ieee80211_register_hw);
961
962 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
963 {
964         struct ieee80211_local *local = hw_to_local(hw);
965
966         tasklet_kill(&local->tx_pending_tasklet);
967         tasklet_kill(&local->tasklet);
968
969         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
970                                &local->network_latency_notifier);
971 #ifdef CONFIG_INET
972         unregister_inetaddr_notifier(&local->ifa_notifier);
973 #endif
974
975         rtnl_lock();
976
977         /*
978          * At this point, interface list manipulations are fine
979          * because the driver cannot be handing us frames any
980          * more and the tasklet is killed.
981          */
982         ieee80211_remove_interfaces(local);
983
984         rtnl_unlock();
985
986         /*
987          * Now all work items will be gone, but the
988          * timer might still be armed, so delete it
989          */
990         del_timer_sync(&local->work_timer);
991
992         cancel_work_sync(&local->restart_work);
993         cancel_work_sync(&local->reconfig_filter);
994
995         ieee80211_clear_tx_pending(local);
996         sta_info_stop(local);
997         rate_control_deinitialize(local);
998
999         if (skb_queue_len(&local->skb_queue) ||
1000             skb_queue_len(&local->skb_queue_unreliable))
1001                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1002         skb_queue_purge(&local->skb_queue);
1003         skb_queue_purge(&local->skb_queue_unreliable);
1004         skb_queue_purge(&local->rx_skb_queue);
1005
1006         destroy_workqueue(local->workqueue);
1007         wiphy_unregister(local->hw.wiphy);
1008         ieee80211_wep_free(local);
1009         ieee80211_led_exit(local);
1010         kfree(local->int_scan_req);
1011 }
1012 EXPORT_SYMBOL(ieee80211_unregister_hw);
1013
1014 void ieee80211_free_hw(struct ieee80211_hw *hw)
1015 {
1016         struct ieee80211_local *local = hw_to_local(hw);
1017
1018         mutex_destroy(&local->iflist_mtx);
1019         mutex_destroy(&local->mtx);
1020
1021         if (local->wiphy_ciphers_allocated)
1022                 kfree(local->hw.wiphy->cipher_suites);
1023
1024         wiphy_free(local->hw.wiphy);
1025 }
1026 EXPORT_SYMBOL(ieee80211_free_hw);
1027
1028 static int __init ieee80211_init(void)
1029 {
1030         struct sk_buff *skb;
1031         int ret;
1032
1033         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1034         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1035                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1036
1037         ret = rc80211_minstrel_init();
1038         if (ret)
1039                 return ret;
1040
1041         ret = rc80211_minstrel_ht_init();
1042         if (ret)
1043                 goto err_minstrel;
1044
1045         ret = rc80211_pid_init();
1046         if (ret)
1047                 goto err_pid;
1048
1049         ret = ieee80211_iface_init();
1050         if (ret)
1051                 goto err_netdev;
1052
1053         return 0;
1054  err_netdev:
1055         rc80211_pid_exit();
1056  err_pid:
1057         rc80211_minstrel_ht_exit();
1058  err_minstrel:
1059         rc80211_minstrel_exit();
1060
1061         return ret;
1062 }
1063
1064 static void __exit ieee80211_exit(void)
1065 {
1066         rc80211_pid_exit();
1067         rc80211_minstrel_ht_exit();
1068         rc80211_minstrel_exit();
1069
1070         if (mesh_allocated)
1071                 ieee80211s_stop();
1072
1073         ieee80211_iface_exit();
1074 }
1075
1076
1077 subsys_initcall(ieee80211_init);
1078 module_exit(ieee80211_exit);
1079
1080 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1081 MODULE_LICENSE("GPL");