summaryrefslogtreecommitdiffstats
path: root/net/wireless/mlme.c
blob: c52ff59a3e96d7cabb892bff220b86c580069a43 (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
/*
 * cfg80211 MLME SAP interface
 *
 * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/nl80211.h>
#include <linux/slab.h>
#include <linux/wireless.h>
#include <net/cfg80211.h>
#include <net/iw_handler.h>
#include "core.h"
#include "nl80211.h"
#include "rdev-ops.h"


void cfg80211_rx_assoc_resp(struct net_device *dev, struct cfg80211_bss *bss,
			    const u8 *buf, size_t len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	u8 *ie = mgmt->u.assoc_resp.variable;
	int ieoffs = offsetof(struct ieee80211_mgmt, u.assoc_resp.variable);
	u16 status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);

	trace_cfg80211_send_rx_assoc(dev, bss);

	/*
	 * This is a bit of a hack, we don't notify userspace of
	 * a (re-)association reply if we tried to send a reassoc
	 * and got a reject -- we only try again with an assoc
	 * frame instead of reassoc.
	 */
	if (cfg80211_sme_rx_assoc_resp(wdev, status_code)) {
		cfg80211_unhold_bss(bss_from_pub(bss));
		cfg80211_put_bss(wiphy, bss);
		return;
	}

	nl80211_send_rx_assoc(rdev, dev, buf, len, GFP_KERNEL);
	/* update current_bss etc., consumes the bss reference */
	__cfg80211_connect_result(dev, mgmt->bssid, NULL, 0, ie, len - ieoffs,
				  status_code,
				  status_code == WLAN_STATUS_SUCCESS, bss);
}
EXPORT_SYMBOL(cfg80211_rx_assoc_resp);

static void cfg80211_process_auth(struct wireless_dev *wdev,
				  const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);

	nl80211_send_rx_auth(rdev, wdev->netdev, buf, len, GFP_KERNEL);
	cfg80211_sme_rx_auth(wdev, buf, len);
}

static void cfg80211_process_deauth(struct wireless_dev *wdev,
				    const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	const u8 *bssid = mgmt->bssid;
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
	bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);

	nl80211_send_deauth(rdev, wdev->netdev, buf, len, GFP_KERNEL);

	if (!wdev->current_bss ||
	    !ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
		return;

	__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
	cfg80211_sme_deauth(wdev);
}

static void cfg80211_process_disassoc(struct wireless_dev *wdev,
				      const u8 *buf, size_t len)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
	const u8 *bssid = mgmt->bssid;
	u16 reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
	bool from_ap = !ether_addr_equal(mgmt->sa, wdev->netdev->dev_addr);

	nl80211_send_disassoc(rdev, wdev->netdev, buf, len, GFP_KERNEL);

	if (WARN_ON(!wdev->current_bss ||
		    !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
		return;

	__cfg80211_disconnected(wdev->netdev, NULL, 0, reason_code, from_ap);
	cfg80211_sme_disassoc(wdev);
}

void cfg80211_rx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct ieee80211_mgmt *mgmt = (void *)buf;

	ASSERT_WDEV_LOCK(wdev);

	trace_cfg80211_rx_mlme_mgmt(dev, buf, len);

	if (WARN_ON(len < 2))
		return;

	if (ieee80211_is_auth(mgmt->frame_control))
		cfg80211_process_auth(wdev, buf, len);
	else if (ieee80211_is_deauth(mgmt->frame_control))
		cfg80211_process_deauth(wdev, buf, len);
	else if (ieee80211_is_disassoc(mgmt->frame_control))
		cfg80211_process_disassoc(wdev, buf, len);
}
EXPORT_SYMBOL(cfg80211_rx_mlme_mgmt);

void cfg80211_auth_timeout(struct net_device *dev, const u8 *addr)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);

	trace_cfg80211_send_auth_timeout(dev, addr);

	nl80211_send_auth_timeout(rdev, dev, addr, GFP_KERNEL);
	cfg80211_sme_auth_timeout(wdev);
}
EXPORT_SYMBOL(cfg80211_auth_timeout);

void cfg80211_assoc_timeout(struct net_device *dev, struct cfg80211_bss *bss)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);

	trace_cfg80211_send_assoc_timeout(dev, bss->bssid);

	nl80211_send_assoc_timeout(rdev, dev, bss->bssid, GFP_KERNEL);
	cfg80211_sme_assoc_timeout(wdev);

	cfg80211_unhold_bss(bss_from_pub(bss));
	cfg80211_put_bss(wiphy, bss);
}
EXPORT_SYMBOL(cfg80211_assoc_timeout);

void cfg80211_tx_mlme_mgmt(struct net_device *dev, const u8 *buf, size_t len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct ieee80211_mgmt *mgmt = (void *)buf;

	ASSERT_WDEV_LOCK(wdev);

	trace_cfg80211_tx_mlme_mgmt(dev, buf, len);

	if (WARN_ON(len < 2))
		return;

	if (ieee80211_is_deauth(mgmt->frame_control))
		cfg80211_process_deauth(wdev, buf, len);
	else
		cfg80211_process_disassoc(wdev, buf, len);
}
EXPORT_SYMBOL(cfg80211_tx_mlme_mgmt);

void cfg80211_michael_mic_failure(struct net_device *dev, const u8 *addr,
				  enum nl80211_key_type key_type, int key_id,
				  const u8 *tsc, gfp_t gfp)
{
	struct wiphy *wiphy = dev->ieee80211_ptr->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
#ifdef CONFIG_CFG80211_WEXT
	union iwreq_data wrqu;
	char *buf = kmalloc(128, gfp);

	if (buf) {
		sprintf(buf, "MLME-MICHAELMICFAILURE.indication("
			"keyid=%d %scast addr=%pM)", key_id,
			key_type == NL80211_KEYTYPE_GROUP ? "broad" : "uni",
			addr);
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = strlen(buf);
		wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
		kfree(buf);
	}
#endif

	trace_cfg80211_michael_mic_failure(dev, addr, key_type, key_id, tsc);
	nl80211_michael_mic_failure(rdev, dev, addr, key_type, key_id, tsc, gfp);
}
EXPORT_SYMBOL(cfg80211_michael_mic_failure);

/* some MLME handling for userspace SME */
int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
		       struct net_device *dev,
		       struct ieee80211_channel *chan,
		       enum nl80211_auth_type auth_type,
		       const u8 *bssid,
		       const u8 *ssid, int ssid_len,
		       const u8 *ie, int ie_len,
		       const u8 *key, int key_len, int key_idx,
		       const u8 *sae_data, int sae_data_len)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_auth_request req = {
		.ie = ie,
		.ie_len = ie_len,
		.sae_data = sae_data,
		.sae_data_len = sae_data_len,
		.auth_type = auth_type,
		.key = key,
		.key_len = key_len,
		.key_idx = key_idx,
	};
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (auth_type == NL80211_AUTHTYPE_SHARED_KEY)
		if (!key || !key_len || key_idx < 0 || key_idx > 4)
			return -EINVAL;

	if (wdev->current_bss &&
	    ether_addr_equal(bssid, wdev->current_bss->pub.bssid))
		return -EALREADY;

	req.bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
				   WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
	if (!req.bss)
		return -ENOENT;

	err = cfg80211_can_use_chan(rdev, wdev, req.bss->channel,
				    CHAN_MODE_SHARED);
	if (err)
		goto out;

	err = rdev_auth(rdev, dev, &req);

out:
	cfg80211_put_bss(&rdev->wiphy, req.bss);
	return err;
}

/*  Do a logical ht_capa &= ht_capa_mask.  */
void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
			       const struct ieee80211_ht_cap *ht_capa_mask)
{
	int i;
	u8 *p1, *p2;
	if (!ht_capa_mask) {
		memset(ht_capa, 0, sizeof(*ht_capa));
		return;
	}

	p1 = (u8*)(ht_capa);
	p2 = (u8*)(ht_capa_mask);
	for (i = 0; i<sizeof(*ht_capa); i++)
		p1[i] &= p2[i];
}

/*  Do a logical ht_capa &= ht_capa_mask.  */
void cfg80211_oper_and_vht_capa(struct ieee80211_vht_cap *vht_capa,
				const struct ieee80211_vht_cap *vht_capa_mask)
{
	int i;
	u8 *p1, *p2;
	if (!vht_capa_mask) {
		memset(vht_capa, 0, sizeof(*vht_capa));
		return;
	}

	p1 = (u8*)(vht_capa);
	p2 = (u8*)(vht_capa_mask);
	for (i = 0; i < sizeof(*vht_capa); i++)
		p1[i] &= p2[i];
}

int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
			struct net_device *dev,
			struct ieee80211_channel *chan,
			const u8 *bssid,
			const u8 *ssid, int ssid_len,
			struct cfg80211_assoc_request *req)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (wdev->current_bss &&
	    (!req->prev_bssid || !ether_addr_equal(wdev->current_bss->pub.bssid,
						   req->prev_bssid)))
		return -EALREADY;

	cfg80211_oper_and_ht_capa(&req->ht_capa_mask,
				  rdev->wiphy.ht_capa_mod_mask);
	cfg80211_oper_and_vht_capa(&req->vht_capa_mask,
				   rdev->wiphy.vht_capa_mod_mask);

	req->bss = cfg80211_get_bss(&rdev->wiphy, chan, bssid, ssid, ssid_len,
				    WLAN_CAPABILITY_ESS, WLAN_CAPABILITY_ESS);
	if (!req->bss)
		return -ENOENT;

	err = cfg80211_can_use_chan(rdev, wdev, chan, CHAN_MODE_SHARED);
	if (err)
		goto out;

	err = rdev_assoc(rdev, dev, req);
	if (!err)
		cfg80211_hold_bss(bss_from_pub(req->bss));

out:
	if (err)
		cfg80211_put_bss(&rdev->wiphy, req->bss);

	return err;
}

int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
			 struct net_device *dev, const u8 *bssid,
			 const u8 *ie, int ie_len, u16 reason,
			 bool local_state_change)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_deauth_request req = {
		.bssid = bssid,
		.reason_code = reason,
		.ie = ie,
		.ie_len = ie_len,
		.local_state_change = local_state_change,
	};

	ASSERT_WDEV_LOCK(wdev);

	if (local_state_change &&
	    (!wdev->current_bss ||
	     !ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
		return 0;

	return rdev_deauth(rdev, dev, &req);
}

int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
			   struct net_device *dev, const u8 *bssid,
			   const u8 *ie, int ie_len, u16 reason,
			   bool local_state_change)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	struct cfg80211_disassoc_request req = {
		.reason_code = reason,
		.local_state_change = local_state_change,
		.ie = ie,
		.ie_len = ie_len,
	};
	int err;

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->current_bss)
		return -ENOTCONN;

	if (ether_addr_equal(wdev->current_bss->pub.bssid, bssid))
		req.bss = &wdev->current_bss->pub;
	else
		return -ENOTCONN;

	err = rdev_disassoc(rdev, dev, &req);
	if (err)
		return err;

	/* driver should have reported the disassoc */
	WARN_ON(wdev->current_bss);
	return 0;
}

void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
			struct net_device *dev)
{
	struct wireless_dev *wdev = dev->ieee80211_ptr;
	u8 bssid[ETH_ALEN];

	ASSERT_WDEV_LOCK(wdev);

	if (!rdev->ops->deauth)
		return;

	if (!wdev->current_bss)
		return;

	memcpy(bssid, wdev->current_bss->pub.bssid, ETH_ALEN);
	cfg80211_mlme_deauth(rdev, dev, bssid, NULL, 0,
			     WLAN_REASON_DEAUTH_LEAVING, false);
}

struct cfg80211_mgmt_registration {
	struct list_head list;

	u32 nlportid;

	int match_len;

	__le16 frame_type;

	u8 match[];
};

int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_portid,
				u16 frame_type, const u8 *match_data,
				int match_len)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	struct cfg80211_mgmt_registration *reg, *nreg;
	int err = 0;
	u16 mgmt_type;

	if (!wdev->wiphy->mgmt_stypes)
		return -EOPNOTSUPP;

	if ((frame_type & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT)
		return -EINVAL;

	if (frame_type & ~(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE))
		return -EINVAL;

	mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
	if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].rx & BIT(mgmt_type)))
		return -EINVAL;

	nreg = kzalloc(sizeof(*reg) + match_len, GFP_KERNEL);
	if (!nreg)
		return -ENOMEM;

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
		int mlen = min(match_len, reg->match_len);

		if (frame_type != le16_to_cpu(reg->frame_type))
			continue;

		if (memcmp(reg->match, match_data, mlen) == 0) {
			err = -EALREADY;
			break;
		}
	}

	if (err) {
		kfree(nreg);
		goto out;
	}

	memcpy(nreg->match, match_data, match_len);
	nreg->match_len = match_len;
	nreg->nlportid = snd_portid;
	nreg->frame_type = cpu_to_le16(frame_type);
	list_add(&nreg->list, &wdev->mgmt_registrations);

	if (rdev->ops->mgmt_frame_register)
		rdev_mgmt_frame_register(rdev, wdev, frame_type, true);

 out:
	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	return err;
}

void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlportid)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	struct cfg80211_mgmt_registration *reg, *tmp;

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
		if (reg->nlportid != nlportid)
			continue;

		if (rdev->ops->mgmt_frame_register) {
			u16 frame_type = le16_to_cpu(reg->frame_type);

			rdev_mgmt_frame_register(rdev, wdev,
						 frame_type, false);
		}

		list_del(&reg->list);
		kfree(reg);
	}

	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	if (nlportid && rdev->crit_proto_nlportid == nlportid) {
		rdev->crit_proto_nlportid = 0;
		rdev_crit_proto_stop(rdev, wdev);
	}

	if (nlportid == wdev->ap_unexpected_nlportid)
		wdev->ap_unexpected_nlportid = 0;
}

void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev)
{
	struct cfg80211_mgmt_registration *reg, *tmp;

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry_safe(reg, tmp, &wdev->mgmt_registrations, list) {
		list_del(&reg->list);
		kfree(reg);
	}

	spin_unlock_bh(&wdev->mgmt_registrations_lock);
}

int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
			  struct wireless_dev *wdev,
			  struct cfg80211_mgmt_tx_params *params, u64 *cookie)
{
	const struct ieee80211_mgmt *mgmt;
	u16 stype;

	if (!wdev->wiphy->mgmt_stypes)
		return -EOPNOTSUPP;

	if (!rdev->ops->mgmt_tx)
		return -EOPNOTSUPP;

	if (params->len < 24 + 1)
		return -EINVAL;

	mgmt = (const struct ieee80211_mgmt *)params->buf;

	if (!ieee80211_is_mgmt(mgmt->frame_control))
		return -EINVAL;

	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
	if (!(wdev->wiphy->mgmt_stypes[wdev->iftype].tx & BIT(stype >> 4)))
		return -EINVAL;

	if (ieee80211_is_action(mgmt->frame_control) &&
	    mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) {
		int err = 0;

		wdev_lock(wdev);

		switch (wdev->iftype) {
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_STATION:
		case NL80211_IFTYPE_P2P_CLIENT:
			if (!wdev->current_bss) {
				err = -ENOTCONN;
				break;
			}

			if (!ether_addr_equal(wdev->current_bss->pub.bssid,
					      mgmt->bssid)) {
				err = -ENOTCONN;
				break;
			}

			/*
			 * check for IBSS DA must be done by driver as
			 * cfg80211 doesn't track the stations
			 */
			if (wdev->iftype == NL80211_IFTYPE_ADHOC)
				break;

			/* for station, check that DA is the AP */
			if (!ether_addr_equal(wdev->current_bss->pub.bssid,
					      mgmt->da)) {
				err = -ENOTCONN;
				break;
			}
			break;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_P2P_GO:
		case NL80211_IFTYPE_AP_VLAN:
			if (!ether_addr_equal(mgmt->bssid, wdev_address(wdev)))
				err = -EINVAL;
			break;
		case NL80211_IFTYPE_MESH_POINT:
			if (!ether_addr_equal(mgmt->sa, mgmt->bssid)) {
				err = -EINVAL;
				break;
			}
			/*
			 * check for mesh DA must be done by driver as
			 * cfg80211 doesn't track the stations
			 */
			break;
		case NL80211_IFTYPE_P2P_DEVICE:
			/*
			 * fall through, P2P device only supports
			 * public action frames
			 */
		default:
			err = -EOPNOTSUPP;
			break;
		}
		wdev_unlock(wdev);

		if (err)
			return err;
	}

	if (!ether_addr_equal(mgmt->sa, wdev_address(wdev)))
		return -EINVAL;

	/* Transmit the Action frame as requested by user space */
	return rdev_mgmt_tx(rdev, wdev, params, cookie);
}

bool cfg80211_rx_mgmt(struct wireless_dev *wdev, int freq, int sig_mbm,
		      const u8 *buf, size_t len, u32 flags, gfp_t gfp)
{
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	struct cfg80211_mgmt_registration *reg;
	const struct ieee80211_txrx_stypes *stypes =
		&wiphy->mgmt_stypes[wdev->iftype];
	struct ieee80211_mgmt *mgmt = (void *)buf;
	const u8 *data;
	int data_len;
	bool result = false;
	__le16 ftype = mgmt->frame_control &
		cpu_to_le16(IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE);
	u16 stype;

	trace_cfg80211_rx_mgmt(wdev, freq, sig_mbm);
	stype = (le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE) >> 4;

	if (!(stypes->rx & BIT(stype))) {
		trace_cfg80211_return_bool(false);
		return false;
	}

	data = buf + ieee80211_hdrlen(mgmt->frame_control);
	data_len = len - ieee80211_hdrlen(mgmt->frame_control);

	spin_lock_bh(&wdev->mgmt_registrations_lock);

	list_for_each_entry(reg, &wdev->mgmt_registrations, list) {
		if (reg->frame_type != ftype)
			continue;

		if (reg->match_len > data_len)
			continue;

		if (memcmp(reg->match, data, reg->match_len))
			continue;

		/* found match! */

		/* Indicate the received Action frame to user space */
		if (nl80211_send_mgmt(rdev, wdev, reg->nlportid,
				      freq, sig_mbm,
				      buf, len, flags, gfp))
			continue;

		result = true;
		break;
	}

	spin_unlock_bh(&wdev->mgmt_registrations_lock);

	trace_cfg80211_return_bool(result);
	return result;
}
EXPORT_SYMBOL(cfg80211_rx_mgmt);

void cfg80211_dfs_channels_update_work(struct work_struct *work)
{
	struct delayed_work *delayed_work;
	struct cfg80211_registered_device *rdev;
	struct cfg80211_chan_def chandef;
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *c;
	struct wiphy *wiphy;
	bool check_again = false;
	unsigned long timeout, next_time = 0;
	int bandid, i;

	delayed_work = container_of(work, struct delayed_work, work);
	rdev = container_of(delayed_work, struct cfg80211_registered_device,
			    dfs_update_channels_wk);
	wiphy = &rdev->wiphy;

	rtnl_lock();
	for (bandid = 0; bandid < IEEE80211_NUM_BANDS; bandid++) {
		sband = wiphy->bands[bandid];
		if (!sband)
			continue;

		for (i = 0; i < sband->n_channels; i++) {
			c = &sband->channels[i];

			if (c->dfs_state != NL80211_DFS_UNAVAILABLE)
				continue;

			timeout = c->dfs_state_entered + msecs_to_jiffies(
					IEEE80211_DFS_MIN_NOP_TIME_MS);

			if (time_after_eq(jiffies, timeout)) {
				c->dfs_state = NL80211_DFS_USABLE;
				c->dfs_state_entered = jiffies;

				cfg80211_chandef_create(&chandef, c,
							NL80211_CHAN_NO_HT);

				nl80211_radar_notify(rdev, &chandef,
						     NL80211_RADAR_NOP_FINISHED,
						     NULL, GFP_ATOMIC);
				continue;
			}

			if (!check_again)
				next_time = timeout - jiffies;
			else
				next_time = min(next_time, timeout - jiffies);
			check_again = true;
		}
	}
	rtnl_unlock();

	/* reschedule if there are other channels waiting to be cleared again */
	if (check_again)
		queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
				   next_time);
}


void cfg80211_radar_event(struct wiphy *wiphy,
			  struct cfg80211_chan_def *chandef,
			  gfp_t gfp)
{
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	unsigned long timeout;

	trace_cfg80211_radar_event(wiphy, chandef);

	/* only set the chandef supplied channel to unavailable, in
	 * case the radar is detected on only one of multiple channels
	 * spanned by the chandef.
	 */
	cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_UNAVAILABLE);

	timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_NOP_TIME_MS);
	queue_delayed_work(cfg80211_wq, &rdev->dfs_update_channels_wk,
			   timeout);

	nl80211_radar_notify(rdev, chandef, NL80211_RADAR_DETECTED, NULL, gfp);
}
EXPORT_SYMBOL(cfg80211_radar_event);

void cfg80211_cac_event(struct net_device *netdev,
			const struct cfg80211_chan_def *chandef,
			enum nl80211_radar_event event, gfp_t gfp)
{
	struct wireless_dev *wdev = netdev->ieee80211_ptr;
	struct wiphy *wiphy = wdev->wiphy;
	struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
	unsigned long timeout;

	trace_cfg80211_cac_event(netdev, event);

	if (WARN_ON(!wdev->cac_started))
		return;

	if (WARN_ON(!wdev->chandef.chan))
		return;

	switch (event) {
	case NL80211_RADAR_CAC_FINISHED:
		timeout = wdev->cac_start_time +
			  msecs_to_jiffies(wdev->cac_time_ms);
		WARN_ON(!time_after_eq(jiffies, timeout));
		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
		break;
	case NL80211_RADAR_CAC_ABORTED:
		break;
	default:
		WARN_ON(1);
		return;
	}
	wdev->cac_started = false;

	nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
}
EXPORT_SYMBOL(cfg80211_cac_event);
OpenPOWER on IntegriCloud