summaryrefslogtreecommitdiffstats
path: root/net/mac80211/mesh.c
blob: 764593d65fc3a4023f234b1671b3766ad76349e6 (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
/*
 * Copyright (c) 2008, 2009 open80211s Ltd.
 * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
 * 	       Javier Cardona <javier@cozybit.com>
 *
 * 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 <linux/slab.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "mesh.h"

#define TMR_RUNNING_HK	0
#define TMR_RUNNING_MP	1
#define TMR_RUNNING_MPR	2

int mesh_allocated;
static struct kmem_cache *rm_cache;

#ifdef CONFIG_MAC80211_MESH
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
{
	return (mgmt->u.action.u.mesh_action.action_code ==
			WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
}
#else
bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
{ return false; }
#endif

void ieee80211s_init(void)
{
	mesh_pathtbl_init();
	mesh_allocated = 1;
	rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
				     0, 0, NULL);
}

void ieee80211s_stop(void)
{
	mesh_pathtbl_unregister();
	kmem_cache_destroy(rm_cache);
}

static void ieee80211_mesh_housekeeping_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata = (void *) data;
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);

	if (local->quiescing) {
		set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
		return;
	}

	ieee80211_queue_work(&local->hw, &sdata->work);
}

/**
 * mesh_matches_local - check if the config of a mesh point matches ours
 *
 * @sdata: local mesh subif
 * @ie: information elements of a management frame from the mesh peer
 *
 * This function checks if the mesh configuration of a mesh point matches the
 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
 */
bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
			struct ieee802_11_elems *ie)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_local *local = sdata->local;
	u32 basic_rates = 0;
	enum nl80211_channel_type sta_channel_type = NL80211_CHAN_NO_HT;

	/*
	 * As support for each feature is added, check for matching
	 * - On mesh config capabilities
	 *   - Power Save Support En
	 *   - Sync support enabled
	 *   - Sync support active
	 *   - Sync support required from peer
	 *   - MDA enabled
	 * - Power management control on fc
	 */
	if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
	     memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
	     (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
	     (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
	     (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
	     (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
		goto mismatch;

	ieee80211_sta_get_rates(local, ie, local->oper_channel->band,
				&basic_rates);

	if (sdata->vif.bss_conf.basic_rates != basic_rates)
		goto mismatch;

	if (ie->ht_operation)
		sta_channel_type =
			ieee80211_ht_oper_to_channel_type(ie->ht_operation);

	/* Disallow HT40+/- mismatch */
	if (ie->ht_operation &&
	    (local->_oper_channel_type == NL80211_CHAN_HT40MINUS ||
	    local->_oper_channel_type == NL80211_CHAN_HT40PLUS) &&
	    (sta_channel_type == NL80211_CHAN_HT40MINUS ||
	     sta_channel_type == NL80211_CHAN_HT40PLUS) &&
	    local->_oper_channel_type != sta_channel_type)
		goto mismatch;

	return true;
mismatch:
	return false;
}

/**
 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 *
 * @ie: information elements of a management frame from the mesh peer
 */
bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
{
	return (ie->mesh_config->meshconf_cap &
	    MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
}

/**
 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 *
 * @sdata: mesh interface in which mesh beacons are going to be updated
 */
void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
{
	bool free_plinks;

	/* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
	 * the mesh interface might be able to establish plinks with peers that
	 * are already on the table but are not on PLINK_ESTAB state. However,
	 * in general the mesh interface is not accepting peer link requests
	 * from new peers, and that must be reflected in the beacon
	 */
	free_plinks = mesh_plink_availables(sdata);

	if (free_plinks != sdata->u.mesh.accepting_plinks)
		ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
}

int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
{
	int i;

	sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
	if (!sdata->u.mesh.rmc)
		return -ENOMEM;
	sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
	for (i = 0; i < RMC_BUCKETS; i++)
		INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
	return 0;
}

void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
{
	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
	struct rmc_entry *p, *n;
	int i;

	if (!sdata->u.mesh.rmc)
		return;

	for (i = 0; i < RMC_BUCKETS; i++)
		list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
			list_del(&p->list);
			kmem_cache_free(rm_cache, p);
		}

	kfree(rmc);
	sdata->u.mesh.rmc = NULL;
}

/**
 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 *
 * @sa:		source address
 * @mesh_hdr:	mesh_header
 *
 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 *
 * Checks using the source address and the mesh sequence number if we have
 * received this frame lately. If the frame is not in the cache, it is added to
 * it.
 */
int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
		   struct ieee80211_sub_if_data *sdata)
{
	struct mesh_rmc *rmc = sdata->u.mesh.rmc;
	u32 seqnum = 0;
	int entries = 0;
	u8 idx;
	struct rmc_entry *p, *n;

	/* Don't care about endianness since only match matters */
	memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
	idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
	list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
		++entries;
		if (time_after(jiffies, p->exp_time) ||
				(entries == RMC_QUEUE_MAX_LEN)) {
			list_del(&p->list);
			kmem_cache_free(rm_cache, p);
			--entries;
		} else if ((seqnum == p->seqnum) &&
			   (ether_addr_equal(sa, p->sa)))
			return -1;
	}

	p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
	if (!p)
		return 0;

	p->seqnum = seqnum;
	p->exp_time = jiffies + RMC_TIMEOUT;
	memcpy(p->sa, sa, ETH_ALEN);
	list_add(&p->list, &rmc->bucket[idx].list);
	return 0;
}

int
mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	u8 *pos, neighbors;
	u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);

	if (skb_tailroom(skb) < 2 + meshconf_len)
		return -ENOMEM;

	pos = skb_put(skb, 2 + meshconf_len);
	*pos++ = WLAN_EID_MESH_CONFIG;
	*pos++ = meshconf_len;

	/* Active path selection protocol ID */
	*pos++ = ifmsh->mesh_pp_id;
	/* Active path selection metric ID   */
	*pos++ = ifmsh->mesh_pm_id;
	/* Congestion control mode identifier */
	*pos++ = ifmsh->mesh_cc_id;
	/* Synchronization protocol identifier */
	*pos++ = ifmsh->mesh_sp_id;
	/* Authentication Protocol identifier */
	*pos++ = ifmsh->mesh_auth_id;
	/* Mesh Formation Info - number of neighbors */
	neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
	/* Number of neighbor mesh STAs or 15 whichever is smaller */
	neighbors = (neighbors > 15) ? 15 : neighbors;
	*pos++ = neighbors << 1;
	/* Mesh capability */
	ifmsh->accepting_plinks = mesh_plink_availables(sdata);
	*pos = MESHCONF_CAPAB_FORWARDING;
	*pos |= ifmsh->accepting_plinks ?
	    MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
	*pos++ |= ifmsh->adjusting_tbtt ?
	    MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
	*pos++ = 0x00;

	return 0;
}

int
mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	u8 *pos;

	if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
		return -ENOMEM;

	pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
	*pos++ = WLAN_EID_MESH_ID;
	*pos++ = ifmsh->mesh_id_len;
	if (ifmsh->mesh_id_len)
		memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);

	return 0;
}

int
mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	u8 offset, len;
	const u8 *data;

	if (!ifmsh->ie || !ifmsh->ie_len)
		return 0;

	/* fast-forward to vendor IEs */
	offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);

	if (offset) {
		len = ifmsh->ie_len - offset;
		data = ifmsh->ie + offset;
		if (skb_tailroom(skb) < len)
			return -ENOMEM;
		memcpy(skb_put(skb, len), data, len);
	}

	return 0;
}

int
mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	u8 len = 0;
	const u8 *data;

	if (!ifmsh->ie || !ifmsh->ie_len)
		return 0;

	/* find RSN IE */
	data = ifmsh->ie;
	while (data < ifmsh->ie + ifmsh->ie_len) {
		if (*data == WLAN_EID_RSN) {
			len = data[1] + 2;
			break;
		}
		data++;
	}

	if (len) {
		if (skb_tailroom(skb) < len)
			return -ENOMEM;
		memcpy(skb_put(skb, len), data, len);
	}

	return 0;
}

int mesh_add_ds_params_ie(struct sk_buff *skb,
			  struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	u8 *pos;

	if (skb_tailroom(skb) < 3)
		return -ENOMEM;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	if (sband->band == IEEE80211_BAND_2GHZ) {
		pos = skb_put(skb, 2 + 1);
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
	}

	return 0;
}

int mesh_add_ht_cap_ie(struct sk_buff *skb,
		       struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	u8 *pos;

	sband = local->hw.wiphy->bands[local->oper_channel->band];
	if (!sband->ht_cap.ht_supported ||
	    local->_oper_channel_type == NL80211_CHAN_NO_HT)
		return 0;

	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
		return -ENOMEM;

	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
	ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);

	return 0;
}

int mesh_add_ht_oper_ie(struct sk_buff *skb,
			struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_channel *channel = local->oper_channel;
	enum nl80211_channel_type channel_type = local->_oper_channel_type;
	struct ieee80211_supported_band *sband =
				local->hw.wiphy->bands[channel->band];
	struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
	u8 *pos;

	if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
		return 0;

	if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
		return -ENOMEM;

	pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
	ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type,
				   sdata->vif.bss_conf.ht_operation_mode);

	return 0;
}
static void ieee80211_mesh_path_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing) {
		set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
		return;
	}

	ieee80211_queue_work(&local->hw, &sdata->work);
}

static void ieee80211_mesh_path_root_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_local *local = sdata->local;

	set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);

	if (local->quiescing) {
		set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
		return;
	}

	ieee80211_queue_work(&local->hw, &sdata->work);
}

void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
{
	if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
		set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
	else {
		clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
		/* stop running timer */
		del_timer_sync(&ifmsh->mesh_path_root_timer);
	}
}

/**
 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 * @hdr:    	802.11 frame header
 * @fc:		frame control field
 * @meshda:	destination address in the mesh
 * @meshsa:	source address address in the mesh.  Same as TA, as frame is
 *              locally originated.
 *
 * Return the length of the 802.11 (does not include a mesh control header)
 */
int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
				  const u8 *meshda, const u8 *meshsa)
{
	if (is_multicast_ether_addr(meshda)) {
		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
		/* DA TA SA */
		memcpy(hdr->addr1, meshda, ETH_ALEN);
		memcpy(hdr->addr2, meshsa, ETH_ALEN);
		memcpy(hdr->addr3, meshsa, ETH_ALEN);
		return 24;
	} else {
		*fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
		/* RA TA DA SA */
		memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
		memcpy(hdr->addr2, meshsa, ETH_ALEN);
		memcpy(hdr->addr3, meshda, ETH_ALEN);
		memcpy(hdr->addr4, meshsa, ETH_ALEN);
		return 30;
	}
}

/**
 * ieee80211_new_mesh_header - create a new mesh header
 * @meshhdr:    uninitialized mesh header
 * @sdata:	mesh interface to be used
 * @addr4or5:   1st address in the ae header, which may correspond to address 4
 *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 *              be NULL.
 * @addr6:	2nd address in the ae header, which corresponds to addr6 of the
 *              mesh frame
 *
 * Return the header length.
 */
int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
		struct ieee80211_sub_if_data *sdata, char *addr4or5,
		char *addr6)
{
	int aelen = 0;
	BUG_ON(!addr4or5 && addr6);
	memset(meshhdr, 0, sizeof(*meshhdr));
	meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
	put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
	sdata->u.mesh.mesh_seqnum++;
	if (addr4or5 && !addr6) {
		meshhdr->flags |= MESH_FLAGS_AE_A4;
		aelen += ETH_ALEN;
		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
	} else if (addr4or5 && addr6) {
		meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
		aelen += 2 * ETH_ALEN;
		memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
		memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
	}
	return 6 + aelen;
}

static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
			   struct ieee80211_if_mesh *ifmsh)
{
	bool free_plinks;

	ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
	mesh_path_expire(sdata);

	free_plinks = mesh_plink_availables(sdata);
	if (free_plinks != sdata->u.mesh.accepting_plinks)
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);

	mod_timer(&ifmsh->housekeeping_timer,
		  round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
}

static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	u32 interval;

	mesh_path_tx_root_frame(sdata);

	if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
		interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
	else
		interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;

	mod_timer(&ifmsh->mesh_path_root_timer,
		  round_jiffies(TU_TO_EXP_TIME(interval)));
}

#ifdef CONFIG_PM
void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	/* use atomic bitops in case all timers fire at the same time */

	if (del_timer_sync(&ifmsh->housekeeping_timer))
		set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
	if (del_timer_sync(&ifmsh->mesh_path_timer))
		set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
	if (del_timer_sync(&ifmsh->mesh_path_root_timer))
		set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
}

void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
		add_timer(&ifmsh->housekeeping_timer);
	if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
		add_timer(&ifmsh->mesh_path_timer);
	if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
		add_timer(&ifmsh->mesh_path_root_timer);
	ieee80211_mesh_root_setup(ifmsh);
}
#endif

void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee80211_local *local = sdata->local;

	local->fif_other_bss++;
	/* mesh ifaces must set allmulti to forward mcast traffic */
	atomic_inc(&local->iff_allmultis);
	ieee80211_configure_filter(local);

	ifmsh->mesh_cc_id = 0;	/* Disabled */
	ifmsh->mesh_auth_id = 0;	/* Disabled */
	/* register sync ops from extensible synchronization framework */
	ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
	ifmsh->adjusting_tbtt = false;
	ifmsh->sync_offset_clockdrift_max = 0;
	set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
	ieee80211_mesh_root_setup(ifmsh);
	ieee80211_queue_work(&local->hw, &sdata->work);
	sdata->vif.bss_conf.ht_operation_mode =
				ifmsh->mshcfg.ht_opmode;
	sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
	sdata->vif.bss_conf.basic_rates =
		ieee80211_mandatory_rates(sdata->local,
					  sdata->local->hw.conf.channel->band);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
						BSS_CHANGED_BEACON_ENABLED |
						BSS_CHANGED_HT |
						BSS_CHANGED_BASIC_RATES |
						BSS_CHANGED_BEACON_INT);
}

void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	ifmsh->mesh_id_len = 0;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
	sta_info_flush(local, NULL);

	del_timer_sync(&sdata->u.mesh.housekeeping_timer);
	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
	/*
	 * If the timer fired while we waited for it, it will have
	 * requeued the work. Now the work will be running again
	 * but will not rearm the timer again because it checks
	 * whether the interface is running, which, at this point,
	 * it no longer is.
	 */
	cancel_work_sync(&sdata->work);

	local->fif_other_bss--;
	atomic_dec(&local->iff_allmultis);
	ieee80211_configure_filter(local);
}

static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
					u16 stype,
					struct ieee80211_mgmt *mgmt,
					size_t len,
					struct ieee80211_rx_status *rx_status)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
	struct ieee802_11_elems elems;
	struct ieee80211_channel *channel;
	size_t baselen;
	int freq;
	enum ieee80211_band band = rx_status->band;

	/* ignore ProbeResp to foreign address */
	if (stype == IEEE80211_STYPE_PROBE_RESP &&
	    !ether_addr_equal(mgmt->da, sdata->vif.addr))
		return;

	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
			       &elems);

	/* ignore beacons from secure mesh peers if our security is off */
	if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
		return;

	if (elems.ds_params && elems.ds_params_len == 1)
		freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
	else
		freq = rx_status->freq;

	channel = ieee80211_get_channel(local->hw.wiphy, freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

	if (elems.mesh_id && elems.mesh_config &&
	    mesh_matches_local(sdata, &elems))
		mesh_neighbour_update(sdata, mgmt->sa, &elems);

	if (ifmsh->sync_ops)
		ifmsh->sync_ops->rx_bcn_presp(sdata,
			stype, mgmt, &elems, rx_status);
}

static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
					  struct ieee80211_mgmt *mgmt,
					  size_t len,
					  struct ieee80211_rx_status *rx_status)
{
	switch (mgmt->u.action.category) {
	case WLAN_CATEGORY_SELF_PROTECTED:
		switch (mgmt->u.action.u.self_prot.action_code) {
		case WLAN_SP_MESH_PEERING_OPEN:
		case WLAN_SP_MESH_PEERING_CLOSE:
		case WLAN_SP_MESH_PEERING_CONFIRM:
			mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
			break;
		}
		break;
	case WLAN_CATEGORY_MESH_ACTION:
		if (mesh_action_is_path_sel(mgmt))
			mesh_rx_path_sel_frame(sdata, mgmt, len);
		break;
	}
}

void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				   struct sk_buff *skb)
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 stype;

	rx_status = IEEE80211_SKB_RXCB(skb);
	mgmt = (struct ieee80211_mgmt *) skb->data;
	stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;

	switch (stype) {
	case IEEE80211_STYPE_PROBE_RESP:
	case IEEE80211_STYPE_BEACON:
		ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
					    rx_status);
		break;
	case IEEE80211_STYPE_ACTION:
		ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
		break;
	}
}

void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	if (ifmsh->preq_queue_len &&
	    time_after(jiffies,
		       ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
		mesh_path_start_discovery(sdata);

	if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
		mesh_mpath_table_grow();

	if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
		mesh_mpp_table_grow();

	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
		ieee80211_mesh_housekeeping(sdata, ifmsh);

	if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
		ieee80211_mesh_rootpath(sdata);

	if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
		mesh_sync_adjust_tbtt(sdata);
}

void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list)
		if (ieee80211_vif_is_mesh(&sdata->vif))
			ieee80211_queue_work(&local->hw, &sdata->work);
	rcu_read_unlock();
}

void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

	setup_timer(&ifmsh->housekeeping_timer,
		    ieee80211_mesh_housekeeping_timer,
		    (unsigned long) sdata);

	ifmsh->accepting_plinks = true;
	ifmsh->preq_id = 0;
	ifmsh->sn = 0;
	ifmsh->num_gates = 0;
	atomic_set(&ifmsh->mpaths, 0);
	mesh_rmc_init(sdata);
	ifmsh->last_preq = jiffies;
	ifmsh->next_perr = jiffies;
	/* Allocate all mesh structures when creating the first mesh interface. */
	if (!mesh_allocated)
		ieee80211s_init();
	setup_timer(&ifmsh->mesh_path_timer,
		    ieee80211_mesh_path_timer,
		    (unsigned long) sdata);
	setup_timer(&ifmsh->mesh_path_root_timer,
		    ieee80211_mesh_path_root_timer,
		    (unsigned long) sdata);
	INIT_LIST_HEAD(&ifmsh->preq_queue.list);
	spin_lock_init(&ifmsh->mesh_preq_queue_lock);
	spin_lock_init(&ifmsh->sync_offset_lock);
}
OpenPOWER on IntegriCloud