aboutsummaryrefslogtreecommitdiff
path: root/net/mac80211/main.c
blob: 16336480c631a6bd61d47d1137d57ba80ce7aca4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <net/mac80211.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/bitmap.h>
#include <linux/pm_qos.h>
#include <linux/inetdevice.h>
#include <net/net_namespace.h>
#include <net/cfg80211.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "mesh.h"
#include "wep.h"
#include "led.h"
#include "cfg.h"
#include "debugfs.h"

static struct lock_class_key ieee80211_rx_skb_queue_class;

void ieee80211_configure_filter(struct ieee80211_local *local)
{
	u64 mc;
	unsigned int changed_flags;
	unsigned int new_flags = 0;

	if (atomic_read(&local->iff_promiscs))
		new_flags |= FIF_PROMISC_IN_BSS;

	if (atomic_read(&local->iff_allmultis))
		new_flags |= FIF_ALLMULTI;

	if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning))
		new_flags |= FIF_BCN_PRBRESP_PROMISC;

	if (local->fif_probe_req || local->probe_req_reg)
		new_flags |= FIF_PROBE_REQ;

	if (local->fif_fcsfail)
		new_flags |= FIF_FCSFAIL;

	if (local->fif_plcpfail)
		new_flags |= FIF_PLCPFAIL;

	if (local->fif_control)
		new_flags |= FIF_CONTROL;

	if (local->fif_other_bss)
		new_flags |= FIF_OTHER_BSS;

	if (local->fif_pspoll)
		new_flags |= FIF_PSPOLL;

	spin_lock_bh(&local->filter_lock);
	changed_flags = local->filter_flags ^ new_flags;

	mc = drv_prepare_multicast(local, &local->mc_list);
	spin_unlock_bh(&local->filter_lock);

	/* be a bit nasty */
	new_flags |= (1<<31);

	drv_configure_filter(local, changed_flags, &new_flags, mc);

	WARN_ON(new_flags & (1<<31));

	local->filter_flags = new_flags & ~(1<<31);
}

static void ieee80211_reconfig_filter(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, reconfig_filter);

	ieee80211_configure_filter(local);
}

int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
{
	struct ieee80211_channel *chan;
	int ret = 0;
	int power;
	enum nl80211_channel_type channel_type;
	u32 offchannel_flag;

	might_sleep();

	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
	if (local->scan_channel) {
		chan = local->scan_channel;
		/* If scanning on oper channel, use whatever channel-type
		 * is currently in use.
		 */
		if (chan == local->oper_channel)
			channel_type = local->_oper_channel_type;
		else
			channel_type = NL80211_CHAN_NO_HT;
	} else if (local->tmp_channel) {
		chan = local->tmp_channel;
		channel_type = local->tmp_channel_type;
	} else {
		chan = local->oper_channel;
		channel_type = local->_oper_channel_type;
	}

	if (chan != local->oper_channel ||
	    channel_type != local->_oper_channel_type)
		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
	else
		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;

	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

	if (offchannel_flag || chan != local->hw.conf.channel ||
	    channel_type != local->hw.conf.channel_type) {
		local->hw.conf.channel = chan;
		local->hw.conf.channel_type = channel_type;
		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
	}

	if (!conf_is_ht(&local->hw.conf)) {
		/*
		 * mac80211.h documents that this is only valid
		 * when the channel is set to an HT type, and
		 * that otherwise STATIC is used.
		 */
		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
	} else if (local->hw.conf.smps_mode != local->smps_mode) {
		local->hw.conf.smps_mode = local->smps_mode;
		changed |= IEEE80211_CONF_CHANGE_SMPS;
	}

	if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
	    test_bit(SCAN_HW_SCANNING, &local->scanning))
		power = chan->max_power;
	else
		power = local->power_constr_level ?
			min(chan->max_power,
				(chan->max_reg_power  - local->power_constr_level)) :
			chan->max_power;

	if (local->user_power_level >= 0)
		power = min(power, local->user_power_level);

	if (local->hw.conf.power_level != power) {
		changed |= IEEE80211_CONF_CHANGE_POWER;
		local->hw.conf.power_level = power;
	}

	if (changed && local->open_count) {
		ret = drv_config(local, changed);
		/*
		 * Goal:
		 * HW reconfiguration should never fail, the driver has told
		 * us what it can support so it should live up to that promise.
		 *
		 * Current status:
		 * rfkill is not integrated with mac80211 and a
		 * configuration command can thus fail if hardware rfkill
		 * is enabled
		 *
		 * FIXME: integrate rfkill with mac80211 and then add this
		 * WARN_ON() back
		 *
		 */
		/* WARN_ON(ret); */
	}

	return ret;
}

void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
				      u32 changed)
{
	struct ieee80211_local *local = sdata->local;
	static const u8 zero[ETH_ALEN] = { 0 };

	if (!changed)
		return;

	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
	else if (sdata->vif.type == NL80211_IFTYPE_AP)
		sdata->vif.bss_conf.bssid = sdata->vif.addr;
	else if (sdata->vif.type == NL80211_IFTYPE_WDS)
		sdata->vif.bss_conf.bssid = NULL;
	else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		sdata->vif.bss_conf.bssid = zero;
	} else {
		WARN_ON(1);
		return;
	}

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_MESH_POINT:
		break;
	default:
		/* do not warn to simplify caller in scan.c */
		changed &= ~BSS_CHANGED_BEACON_ENABLED;
		if (WARN_ON(changed & BSS_CHANGED_BEACON))
			return;
		break;
	}

	if (changed & BSS_CHANGED_BEACON_ENABLED) {
		if (local->quiescing || !ieee80211_sdata_running(sdata) ||
		    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
			sdata->vif.bss_conf.enable_beacon = false;
		} else {
			/*
			 * Beacon should be enabled, but AP mode must
			 * check whether there is a beacon configured.
			 */
			switch (sdata->vif.type) {
			case NL80211_IFTYPE_AP:
				sdata->vif.bss_conf.enable_beacon =
					!!sdata->u.ap.beacon;
				break;
			case NL80211_IFTYPE_ADHOC:
				sdata->vif.bss_conf.enable_beacon =
					!!sdata->u.ibss.presp;
				break;
#ifdef CONFIG_MAC80211_MESH
			case NL80211_IFTYPE_MESH_POINT:
				sdata->vif.bss_conf.enable_beacon =
					!!sdata->u.mesh.mesh_id_len;
				break;
#endif
			default:
				/* not reached */
				WARN_ON(1);
				break;
			}
		}
	}

	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
}

u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
{
	sdata->vif.bss_conf.use_cts_prot = false;
	sdata->vif.bss_conf.use_short_preamble = false;
	sdata->vif.bss_conf.use_short_slot = false;
	return BSS_CHANGED_ERP_CTS_PROT |
	       BSS_CHANGED_ERP_PREAMBLE |
	       BSS_CHANGED_ERP_SLOT;
}

static void ieee80211_tasklet_handler(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *) data;
	struct sta_info *sta, *tmp;
	struct skb_eosp_msg_data *eosp_data;
	struct sk_buff *skb;

	while ((skb = skb_dequeue(&local->skb_queue)) ||
	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
		switch (skb->pkt_type) {
		case IEEE80211_RX_MSG:
			/* Clear skb->pkt_type in order to not confuse kernel
			 * netstack. */
			skb->pkt_type = 0;
			ieee80211_rx(&local->hw, skb);
			break;
		case IEEE80211_TX_STATUS_MSG:
			skb->pkt_type = 0;
			ieee80211_tx_status(&local->hw, skb);
			break;
		case IEEE80211_EOSP_MSG:
			eosp_data = (void *)skb->cb;
			for_each_sta_info(local, eosp_data->sta, sta, tmp) {
				/* skip wrong virtual interface */
				if (memcmp(eosp_data->iface,
					   sta->sdata->vif.addr, ETH_ALEN))
					continue;
				clear_sta_flag(sta, WLAN_STA_SP);
				break;
			}
			dev_kfree_skb(skb);
			break;
		default:
			WARN(1, "mac80211: Packet is of unknown type %d\n",
			     skb->pkt_type);
			dev_kfree_skb(skb);
			break;
		}
	}
}

static void ieee80211_restart_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, restart_work);

	/* wait for scan work complete */
	flush_workqueue(local->workqueue);

	mutex_lock(&local->mtx);
	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
	     local->sched_scanning,
		"%s called with hardware scan in progress\n", __func__);
	mutex_unlock(&local->mtx);

	rtnl_lock();
	ieee80211_scan_cancel(local);
	ieee80211_reconfig(local);
	rtnl_unlock();
}

void ieee80211_restart_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	trace_api_restart_hw(local);

	wiphy_info(hw->wiphy,
		   "Hardware restart was requested\n");

	/* use this reason, ieee80211_reconfig will unblock it */
	ieee80211_stop_queues_by_reason(hw,
		IEEE80211_QUEUE_STOP_REASON_SUSPEND);

	schedule_work(&local->restart_work);
}
EXPORT_SYMBOL(ieee80211_restart_hw);

static void ieee80211_recalc_smps_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, recalc_smps);

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_smps(local);
	mutex_unlock(&local->iflist_mtx);
}

#ifdef CONFIG_INET
static int ieee80211_ifa_changed(struct notifier_block *nb,
				 unsigned long data, void *arg)
{
	struct in_ifaddr *ifa = arg;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local,
			     ifa_notifier);
	struct net_device *ndev = ifa->ifa_dev->dev;
	struct wireless_dev *wdev = ndev->ieee80211_ptr;
	struct in_device *idev;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_bss_conf *bss_conf;
	struct ieee80211_if_managed *ifmgd;
	int c = 0;

	/* Make sure it's our interface that got changed */
	if (!wdev)
		return NOTIFY_DONE;

	if (wdev->wiphy != local->hw.wiphy)
		return NOTIFY_DONE;

	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
	bss_conf = &sdata->vif.bss_conf;

	/* ARP filtering is only supported in managed mode */
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
		return NOTIFY_DONE;

	idev = __in_dev_get_rtnl(sdata->dev);
	if (!idev)
		return NOTIFY_DONE;

	ifmgd = &sdata->u.mgd;
	mutex_lock(&ifmgd->mtx);

	/* Copy the addresses to the bss_conf list */
	ifa = idev->ifa_list;
	while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
		bss_conf->arp_addr_list[c] = ifa->ifa_address;
		ifa = ifa->ifa_next;
		c++;
	}

	/* If not all addresses fit the list, disable filtering */
	if (ifa) {
		sdata->arp_filter_state = false;
		c = 0;
	} else {
		sdata->arp_filter_state = true;
	}
	bss_conf->arp_addr_cnt = c;

	/* Configure driver only if associated (which also implies it is up) */
	if (ifmgd->associated) {
		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
		ieee80211_bss_info_change_notify(sdata,
						 BSS_CHANGED_ARP_FILTER);
	}

	mutex_unlock(&ifmgd->mtx);

	return NOTIFY_DONE;
}
#endif

static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
{
	struct ieee80211_local *local =
		container_of(napi, struct ieee80211_local, napi);

	return local->ops->napi_poll(&local->hw, budget);
}

void ieee80211_napi_schedule(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	napi_schedule(&local->napi);
}
EXPORT_SYMBOL(ieee80211_napi_schedule);

void ieee80211_napi_complete(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	napi_complete(&local->napi);
}
EXPORT_SYMBOL(ieee80211_napi_complete);

/* There isn't a lot of sense in it, but you can transmit anything you like */
static const struct ieee80211_txrx_stypes
ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
	[NL80211_IFTYPE_ADHOC] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_STATION] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
	},
	[NL80211_IFTYPE_AP] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_AP_VLAN] = {
		/* copy AP */
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_P2P_CLIENT] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
	},
	[NL80211_IFTYPE_P2P_GO] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
			BIT(IEEE80211_STYPE_ACTION >> 4),
	},
	[NL80211_IFTYPE_MESH_POINT] = {
		.tx = 0xffff,
		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
			BIT(IEEE80211_STYPE_AUTH >> 4) |
			BIT(IEEE80211_STYPE_DEAUTH >> 4),
	},
};

static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
			     IEEE80211_HT_AMPDU_PARM_DENSITY,

	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
				IEEE80211_HT_CAP_MAX_AMSDU |
				IEEE80211_HT_CAP_SGI_40),
	.mcs = {
		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
			     0xff, 0xff, 0xff, 0xff, 0xff, },
	},
};

struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
					const struct ieee80211_ops *ops)
{
	struct ieee80211_local *local;
	int priv_size, i;
	struct wiphy *wiphy;

	if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
		return NULL;

	/* Ensure 32-byte alignment of our private data and hw private data.
	 * We use the wiphy priv data for both our ieee80211_local and for
	 * the driver's private data
	 *
	 * In memory it'll be like this:
	 *
	 * +-------------------------+
	 * | struct wiphy	    |
	 * +-------------------------+
	 * | struct ieee80211_local  |
	 * +-------------------------+
	 * | driver's private data   |
	 * +-------------------------+
	 *
	 */
	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;

	wiphy = wiphy_new(&mac80211_config_ops, priv_size);

	if (!wiphy)
		return NULL;

	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;

	wiphy->privid = mac80211_wiphy_privid;

	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
			WIPHY_FLAG_4ADDR_AP |
			WIPHY_FLAG_4ADDR_STATION |
			WIPHY_FLAG_REPORTS_OBSS |
			WIPHY_FLAG_OFFCHAN_TX |
			WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;

	wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
			  NL80211_FEATURE_HT_IBSS;

	if (!ops->set_key)
		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;

	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);

	local = wiphy_priv(wiphy);

	local->hw.wiphy = wiphy;

	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);

	BUG_ON(!ops->tx && !ops->tx_frags);
	BUG_ON(!ops->start);
	BUG_ON(!ops->stop);
	BUG_ON(!ops->config);
	BUG_ON(!ops->add_interface);
	BUG_ON(!ops->remove_interface);
	BUG_ON(!ops->configure_filter);
	local->ops = ops;

	/* set up some defaults */
	local->hw.queues = 1;
	local->hw.max_rates = 1;
	local->hw.max_report_rates = 0;
	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
	local->user_power_level = -1;
	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;

	INIT_LIST_HEAD(&local->interfaces);

	__hw_addr_init(&local->mc_list);

	mutex_init(&local->iflist_mtx);
	mutex_init(&local->mtx);

	mutex_init(&local->key_mtx);
	spin_lock_init(&local->filter_lock);
	spin_lock_init(&local->queue_stop_reason_lock);

	/*
	 * The rx_skb_queue is only accessed from tasklets,
	 * but other SKB queues are used from within IRQ
	 * context. Therefore, this one needs a different
	 * locking class so our direct, non-irq-safe use of
	 * the queue's lock doesn't throw lockdep warnings.
	 */
	skb_queue_head_init_class(&local->rx_skb_queue,
				  &ieee80211_rx_skb_queue_class);

	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);

	ieee80211_work_init(local);

	INIT_WORK(&local->restart_work, ieee80211_restart_work);

	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
	INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
	local->smps_mode = IEEE80211_SMPS_OFF;

	INIT_WORK(&local->dynamic_ps_enable_work,
		  ieee80211_dynamic_ps_enable_work);
	INIT_WORK(&local->dynamic_ps_disable_work,
		  ieee80211_dynamic_ps_disable_work);
	setup_timer(&local->dynamic_ps_timer,
		    ieee80211_dynamic_ps_timer, (unsigned long) local);

	INIT_WORK(&local->sched_scan_stopped_work,
		  ieee80211_sched_scan_stopped_work);

	spin_lock_init(&local->ack_status_lock);
	idr_init(&local->ack_status_frames);
	/* preallocate at least one entry */
	idr_pre_get(&local->ack_status_frames, GFP_KERNEL);

	sta_info_init(local);

	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
		skb_queue_head_init(&local->pending[i]);
		atomic_set(&local->agg_queue_stop[i], 0);
	}
	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
		     (unsigned long)local);

	tasklet_init(&local->tasklet,
		     ieee80211_tasklet_handler,
		     (unsigned long) local);

	skb_queue_head_init(&local->skb_queue);
	skb_queue_head_init(&local->skb_queue_unreliable);

	/* init dummy netdev for use w/ NAPI */
	init_dummy_netdev(&local->napi_dev);

	ieee80211_led_names(local);

	ieee80211_hw_roc_setup(local);

	return &local->hw;
}
EXPORT_SYMBOL(ieee80211_alloc_hw);

int ieee80211_register_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);
	int result, i;
	enum ieee80211_band band;
	int channels, max_bitrates;
	bool supp_ht;
	static const u32 cipher_suites[] = {
		/* keep WEP first, it may be removed below */
		WLAN_CIPHER_SUITE_WEP40,
		WLAN_CIPHER_SUITE_WEP104,
		WLAN_CIPHER_SUITE_TKIP,
		WLAN_CIPHER_SUITE_CCMP,

		/* keep last -- depends on hw flags! */
		WLAN_CIPHER_SUITE_AES_CMAC
	};

	if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
#ifdef CONFIG_PM
	    && (!local->ops->suspend || !local->ops->resume)
#endif
	    )
		return -EINVAL;

	if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
		return -EINVAL;

	if (hw->max_report_rates == 0)
		hw->max_report_rates = hw->max_rates;

	/*
	 * generic code guarantees at least one band,
	 * set this very early because much code assumes
	 * that hw.conf.channel is assigned
	 */
	channels = 0;
	max_bitrates = 0;
	supp_ht = false;
	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[band];
		if (!sband)
			continue;
		if (!local->oper_channel) {
			/* init channel we're on */
			local->hw.conf.channel =
			local->oper_channel = &sband->channels[0];
			local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
		}
		channels += sband->n_channels;

		if (max_bitrates < sband->n_bitrates)
			max_bitrates = sband->n_bitrates;
		supp_ht = supp_ht || sband->ht_cap.ht_supported;
	}

	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
				      sizeof(void *) * channels, GFP_KERNEL);
	if (!local->int_scan_req)
		return -ENOMEM;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		if (!local->hw.wiphy->bands[band])
			continue;
		local->int_scan_req->rates[band] = (u32) -1;
	}

	/* if low-level driver supports AP, we also support VLAN */
	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
	}

	/* mac80211 always supports monitor */
	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);

	/*
	 * mac80211 doesn't support more than 1 channel, and also not more
	 * than one IBSS interface
	 */
	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
		const struct ieee80211_iface_combination *c;
		int j;

		c = &hw->wiphy->iface_combinations[i];

		if (c->num_different_channels > 1)
			return -EINVAL;

		for (j = 0; j < c->n_limits; j++)
			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
			    c->limits[j].max > 1)
				return -EINVAL;
	}

#ifndef CONFIG_MAC80211_MESH
	/* mesh depends on Kconfig, but drivers should set it if they want */
	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
#endif

	/* if the underlying driver supports mesh, mac80211 will (at least)
	 * provide routing of mesh authentication frames to userspace */
	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;

	/* mac80211 supports control port protocol changing */
	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;

	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
	else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;

	WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
	     && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");

	/*
	 * Calculate scan IE length -- we need this to alloc
	 * memory and to subtract from the driver limit. It
	 * includes the DS Params, (extended) supported rates, and HT
	 * information -- SSID is the driver's responsibility.
	 */
	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
		3 /* DS Params */;
	if (supp_ht)
		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);

	if (!local->ops->hw_scan) {
		/* For hw_scan, driver needs to set these up. */
		local->hw.wiphy->max_scan_ssids = 4;
		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
	}

	/*
	 * If the driver supports any scan IEs, then assume the
	 * limit includes the IEs mac80211 will add, otherwise
	 * leave it at zero and let the driver sort it out; we
	 * still pass our IEs to the driver but userspace will
	 * not be allowed to in that case.
	 */
	if (local->hw.wiphy->max_scan_ie_len)
		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;

	/* Set up cipher suites unless driver already did */
	if (!local->hw.wiphy->cipher_suites) {
		local->hw.wiphy->cipher_suites = cipher_suites;
		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
		if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
			local->hw.wiphy->n_cipher_suites--;
	}
	if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
		if (local->hw.wiphy->cipher_suites == cipher_suites) {
			local->hw.wiphy->cipher_suites += 2;
			local->hw.wiphy->n_cipher_suites -= 2;
		} else {
			u32 *suites;
			int r, w = 0;

			/* Filter out WEP */

			suites = kmemdup(
				local->hw.wiphy->cipher_suites,
				sizeof(u32) * local->hw.wiphy->n_cipher_suites,
				GFP_KERNEL);
			if (!suites)
				return -ENOMEM;
			for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
				u32 suite = local->hw.wiphy->cipher_suites[r];
				if (suite == WLAN_CIPHER_SUITE_WEP40 ||
				    suite == WLAN_CIPHER_SUITE_WEP104)
					continue;
				suites[w++] = suite;
			}
			local->hw.wiphy->cipher_suites = suites;
			local->hw.wiphy->n_cipher_suites = w;
			local->wiphy_ciphers_allocated = true;
		}
	}

	if (!local->ops->remain_on_channel)
		local->hw.wiphy->max_remain_on_channel_duration = 5000;

	if (local->ops->sched_scan_start)
		local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;

	/* mac80211 based drivers don't support internal TDLS setup */
	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;

	result = wiphy_register(local->hw.wiphy);
	if (result < 0)
		goto fail_wiphy_register;

	/*
	 * We use the number of queues for feature tests (QoS, HT) internally
	 * so restrict them appropriately.
	 */
	if (hw->queues > IEEE80211_MAX_QUEUES)
		hw->queues = IEEE80211_MAX_QUEUES;

	local->workqueue =
		alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
	if (!local->workqueue) {
		result = -ENOMEM;
		goto fail_workqueue;
	}

	/*
	 * The hardware needs headroom for sending the frame,
	 * and we need some headroom for passing the frame to monitor
	 * interfaces, but never both at the same time.
	 */
	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
				   IEEE80211_TX_STATUS_HEADROOM);

	debugfs_hw_add(local);

	/*
	 * if the driver doesn't specify a max listen interval we
	 * use 5 which should be a safe default
	 */
	if (local->hw.max_listen_interval == 0)
		local->hw.max_listen_interval = 5;

	local->hw.conf.listen_interval = local->hw.max_listen_interval;

	local->dynamic_ps_forced_timeout = -1;

	result = ieee80211_wep_init(local);
	if (result < 0)
		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
			    result);

	ieee80211_led_init(local);

	rtnl_lock();

	result = ieee80211_init_rate_ctrl_alg(local,
					      hw->rate_control_algorithm);
	if (result < 0) {
		wiphy_debug(local->hw.wiphy,
			    "Failed to initialize rate control algorithm\n");
		goto fail_rate;
	}

	/* add one default STA interface if supported */
	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
		result = ieee80211_if_add(local, "wlan%d", NULL,
					  NL80211_IFTYPE_STATION, NULL);
		if (result)
			wiphy_warn(local->hw.wiphy,
				   "Failed to add default virtual iface\n");
	}

	rtnl_unlock();

	local->network_latency_notifier.notifier_call =
		ieee80211_max_network_latency;
	result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
				     &local->network_latency_notifier);
	if (result) {
		rtnl_lock();
		goto fail_pm_qos;
	}

#ifdef CONFIG_INET
	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
	result = register_inetaddr_notifier(&local->ifa_notifier);
	if (result)
		goto fail_ifa;
#endif

	netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
			local->hw.napi_weight);

	return 0;

#ifdef CONFIG_INET
 fail_ifa:
	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
			       &local->network_latency_notifier);
	rtnl_lock();
#endif
 fail_pm_qos:
	ieee80211_led_exit(local);
	ieee80211_remove_interfaces(local);
 fail_rate:
	rtnl_unlock();
	ieee80211_wep_free(local);
	sta_info_stop(local);
	destroy_workqueue(local->workqueue);
 fail_workqueue:
	wiphy_unregister(local->hw.wiphy);
 fail_wiphy_register:
	if (local->wiphy_ciphers_allocated)
		kfree(local->hw.wiphy->cipher_suites);
	kfree(local->int_scan_req);
	return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);

void ieee80211_unregister_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	tasklet_kill(&local->tx_pending_tasklet);
	tasklet_kill(&local->tasklet);

	pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
			       &local->network_latency_notifier);
#ifdef CONFIG_INET
	unregister_inetaddr_notifier(&local->ifa_notifier);
#endif

	rtnl_lock();

	/*
	 * At this point, interface list manipulations are fine
	 * because the driver cannot be handing us frames any
	 * more and the tasklet is killed.
	 */
	ieee80211_remove_interfaces(local);

	rtnl_unlock();

	/*
	 * Now all work items will be gone, but the
	 * timer might still be armed, so delete it
	 */
	del_timer_sync(&local->work_timer);

	cancel_work_sync(&local->restart_work);
	cancel_work_sync(&local->reconfig_filter);

	ieee80211_clear_tx_pending(local);
	rate_control_deinitialize(local);

	if (skb_queue_len(&local->skb_queue) ||
	    skb_queue_len(&local->skb_queue_unreliable))
		wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
	skb_queue_purge(&local->skb_queue);
	skb_queue_purge(&local->skb_queue_unreliable);
	skb_queue_purge(&local->rx_skb_queue);

	destroy_workqueue(local->workqueue);
	wiphy_unregister(local->hw.wiphy);
	sta_info_stop(local);
	ieee80211_wep_free(local);
	ieee80211_led_exit(local);
	kfree(local->int_scan_req);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);

static int ieee80211_free_ack_frame(int id, void *p, void *data)
{
	WARN_ONCE(1, "Have pending ack frames!\n");
	kfree_skb(p);
	return 0;
}

void ieee80211_free_hw(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	mutex_destroy(&local->iflist_mtx);
	mutex_destroy(&local->mtx);

	if (local->wiphy_ciphers_allocated)
		kfree(local->hw.wiphy->cipher_suites);

	idr_for_each(&local->ack_status_frames,
		     ieee80211_free_ack_frame, NULL);
	idr_destroy(&local->ack_status_frames);

	wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);

static int __init ieee80211_init(void)
{
	struct sk_buff *skb;
	int ret;

	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));

	ret = rc80211_minstrel_init();
	if (ret)
		return ret;

	ret = rc80211_minstrel_ht_init();
	if (ret)
		goto err_minstrel;

	ret = rc80211_pid_init();
	if (ret)
		goto err_pid;

	ret = ieee80211_iface_init();
	if (ret)
		goto err_netdev;

	return 0;
 err_netdev:
	rc80211_pid_exit();
 err_pid:
	rc80211_minstrel_ht_exit();
 err_minstrel:
	rc80211_minstrel_exit();

	return ret;
}

static void __exit ieee80211_exit(void)
{
	rc80211_pid_exit();
	rc80211_minstrel_ht_exit();
	rc80211_minstrel_exit();

	if (mesh_allocated)
		ieee80211s_stop();

	ieee80211_iface_exit();

	rcu_barrier();
}


subsys_initcall(ieee80211_init);
module_exit(ieee80211_exit);

MODULE_DESCRIPTION("IEEE 802.11 subsystem");
MODULE_LICENSE("GPL");