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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MLO link handling
4 *
5 * Copyright (C) 2022-2026 Intel Corporation
6 */
7#include <linux/slab.h>
8#include <linux/kernel.h>
9#include <net/mac80211.h>
10#include "ieee80211_i.h"
11#include "driver-ops.h"
12#include "key.h"
13#include "debugfs_netdev.h"
14
15static void ieee80211_update_apvlan_links(struct ieee80211_sub_if_data *sdata)
16{
17 unsigned long rem = ~sdata->vif.valid_links &
18 GENMASK(IEEE80211_MLD_MAX_NUM_LINKS - 1, 0);
19 struct ieee80211_local *local = sdata->local;
20 unsigned long add = sdata->vif.valid_links;
21 struct wiphy *wiphy = local->hw.wiphy;
22 struct ieee80211_sub_if_data *vlan;
23 struct ieee80211_link_data *link;
24 struct sta_info *sta;
25
26 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) {
27 int link_id;
28
29 if (vlan->wdev.use_4addr) {
30 sta = wiphy_dereference(wiphy,
31 vlan->u.vlan.sta);
32 if (sta)
33 add = add & sta->sta.valid_links;
34 }
35
36 if (add == vlan->vif.valid_links)
37 continue;
38
39 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
40 vlan->wdev.valid_links |= BIT(link_id);
41 ether_addr_copy(vlan->wdev.links[link_id].addr,
42 sdata->wdev.links[link_id].addr);
43 }
44
45 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
46 vlan->wdev.valid_links &= ~BIT(link_id);
47 eth_zero_addr(vlan->wdev.links[link_id].addr);
48 }
49
50 ieee80211_vif_set_links(vlan, add, 0);
51
52 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
53 link = sdata_dereference(vlan->link[link_id], vlan);
54 ieee80211_link_vlan_copy_chanctx(link);
55 }
56 }
57}
58
59void ieee80211_apvlan_link_setup(struct ieee80211_sub_if_data *sdata)
60{
61 struct ieee80211_sub_if_data *ap_bss = container_of(sdata->bss,
62 struct ieee80211_sub_if_data, u.ap);
63 u16 new_links = ap_bss->vif.valid_links;
64 unsigned long add;
65 int link_id;
66
67 if (!ap_bss->vif.valid_links)
68 return;
69
70 add = new_links;
71 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
72 sdata->wdev.valid_links |= BIT(link_id);
73 ether_addr_copy(sdata->wdev.links[link_id].addr,
74 ap_bss->wdev.links[link_id].addr);
75 }
76
77 ieee80211_vif_set_links(sdata, new_links, 0);
78}
79
80void ieee80211_apvlan_link_clear(struct ieee80211_sub_if_data *sdata)
81{
82 if (!sdata->wdev.valid_links)
83 return;
84
85 sdata->wdev.valid_links = 0;
86 ieee80211_vif_clear_links(sdata);
87}
88
89void ieee80211_link_setup(struct ieee80211_link_data *link)
90{
91 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
92 ieee80211_mgd_setup_link(link);
93}
94
95void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
96 int link_id,
97 struct ieee80211_link_data *link,
98 struct ieee80211_bss_conf *link_conf)
99{
100 bool deflink = link_id < 0;
101
102 if (link_id < 0)
103 link_id = 0;
104
105 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
106 struct ieee80211_sub_if_data *ap_bss;
107 struct ieee80211_bss_conf *ap_bss_conf;
108
109 ap_bss = container_of(sdata->bss,
110 struct ieee80211_sub_if_data, u.ap);
111
112 if (deflink)
113 ap_bss_conf = &ap_bss->vif.bss_conf;
114 else
115 ap_bss_conf = sdata_dereference(ap_bss->vif.link_conf[link_id],
116 ap_bss);
117
118 memcpy(link_conf, ap_bss_conf, sizeof(*link_conf));
119 }
120
121 link->sdata = sdata;
122 link->link_id = link_id;
123 link->conf = link_conf;
124 link_conf->link_id = link_id;
125 link_conf->vif = &sdata->vif;
126 link->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
127 link->user_power_level = sdata->local->user_power_level;
128 link_conf->txpower = INT_MIN;
129
130 wiphy_work_init(&link->csa.finalize_work,
131 ieee80211_csa_finalize_work);
132 wiphy_work_init(&link->color_change_finalize_work,
133 ieee80211_color_change_finalize_work);
134 wiphy_delayed_work_init(&link->color_collision_detect_work,
135 ieee80211_color_collision_detection_work);
136 wiphy_hrtimer_work_init(&link->dfs_cac_timer_work,
137 ieee80211_dfs_cac_timer_work);
138
139 if (!deflink) {
140 switch (sdata->vif.type) {
141 case NL80211_IFTYPE_AP:
142 case NL80211_IFTYPE_AP_VLAN:
143 ether_addr_copy(link_conf->addr,
144 sdata->wdev.links[link_id].addr);
145 link_conf->bssid = link_conf->addr;
146 WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
147 break;
148 case NL80211_IFTYPE_STATION:
149 /* station sets the bssid in ieee80211_mgd_setup_link */
150 break;
151 default:
152 WARN_ON(1);
153 }
154
155 ieee80211_link_debugfs_add(link);
156 }
157
158 rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
159 rcu_assign_pointer(sdata->link[link_id], link);
160}
161
162void ieee80211_link_stop(struct ieee80211_link_data *link)
163{
164 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
165 ieee80211_mgd_stop_link(link);
166
167 wiphy_delayed_work_cancel(link->sdata->local->hw.wiphy,
168 &link->color_collision_detect_work);
169 wiphy_work_cancel(link->sdata->local->hw.wiphy,
170 &link->color_change_finalize_work);
171 wiphy_work_cancel(link->sdata->local->hw.wiphy,
172 &link->csa.finalize_work);
173
174 if (link->sdata->wdev.links[link->link_id].cac_started) {
175 wiphy_hrtimer_work_cancel(link->sdata->local->hw.wiphy,
176 &link->dfs_cac_timer_work);
177 cfg80211_cac_event(link->sdata->dev,
178 &link->conf->chanreq.oper,
179 NL80211_RADAR_CAC_ABORTED,
180 GFP_KERNEL, link->link_id);
181 }
182
183 ieee80211_link_release_channel(link);
184}
185
186struct link_container {
187 struct ieee80211_link_data data;
188 struct ieee80211_bss_conf conf;
189};
190
191static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
192 struct link_container **links, u16 mask)
193{
194 struct ieee80211_link_data *link;
195 LIST_HEAD(keys);
196 unsigned int link_id;
197
198 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
199 if (!(mask & BIT(link_id)))
200 continue;
201 link = &links[link_id]->data;
202 if (link_id == 0 && !link)
203 link = &sdata->deflink;
204 if (WARN_ON(!link))
205 continue;
206 ieee80211_remove_link_keys(link, &keys);
207 ieee80211_link_debugfs_remove(link);
208 ieee80211_link_stop(link);
209 }
210
211 synchronize_rcu();
212
213 ieee80211_free_key_list(sdata->local, &keys);
214}
215
216static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
217 struct link_container **links)
218{
219 unsigned int link_id;
220
221 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
222 kfree(links[link_id]);
223}
224
225static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
226{
227 unsigned int i, j;
228
229 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
230 struct ieee80211_link_data *link1;
231
232 link1 = sdata_dereference(sdata->link[i], sdata);
233 if (!link1)
234 continue;
235 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
236 struct ieee80211_link_data *link2;
237
238 link2 = sdata_dereference(sdata->link[j], sdata);
239 if (!link2)
240 continue;
241
242 if (ether_addr_equal(link1->conf->addr,
243 link2->conf->addr))
244 return -EALREADY;
245 }
246 }
247
248 return 0;
249}
250
251static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
252 u16 valid_links, u16 dormant_links)
253{
254 sdata->vif.valid_links = valid_links;
255 sdata->vif.dormant_links = dormant_links;
256
257 if (!valid_links ||
258 WARN((~valid_links & dormant_links) ||
259 !(valid_links & ~dormant_links),
260 "Invalid links: valid=0x%x, dormant=0x%x",
261 valid_links, dormant_links)) {
262 sdata->vif.active_links = 0;
263 sdata->vif.dormant_links = 0;
264 return;
265 }
266
267 switch (sdata->vif.type) {
268 case NL80211_IFTYPE_AP:
269 case NL80211_IFTYPE_AP_VLAN:
270 /* in an AP all links are always active */
271 sdata->vif.active_links = valid_links;
272
273 /* AP links are not expected to be disabled */
274 WARN_ON(dormant_links);
275 break;
276 case NL80211_IFTYPE_STATION:
277 if (sdata->vif.active_links)
278 break;
279 sdata->vif.active_links = valid_links & ~dormant_links;
280 WARN_ON(hweight16(sdata->vif.active_links) > 1);
281 break;
282 default:
283 WARN_ON(1);
284 }
285}
286
287static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
288 struct link_container **to_free,
289 u16 new_links, u16 dormant_links)
290{
291 u16 old_links = sdata->vif.valid_links;
292 u16 old_active = sdata->vif.active_links;
293 unsigned long add = new_links & ~old_links;
294 unsigned long rem = old_links & ~new_links;
295 unsigned long sta_rem = rem;
296 unsigned int link_id;
297 int ret;
298 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
299 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
300 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
301 bool use_deflink = old_links == 0; /* set for error case */
302 bool non_sta = sdata->vif.type != NL80211_IFTYPE_STATION;
303 struct sta_info *sta;
304
305 lockdep_assert_wiphy(sdata->local->hw.wiphy);
306
307 memset(to_free, 0, sizeof(links));
308
309 if (old_links == new_links && dormant_links == sdata->vif.dormant_links)
310 return 0;
311
312 if (!old_links || !new_links)
313 WARN_ON(sta_info_flush(sdata, -1) > 0);
314
315 /* if there were no old links, need to clear the pointers to deflink */
316 if (!old_links)
317 rem |= BIT(0);
318
319 /* allocate new link structures first */
320 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
321 link = kzalloc_obj(*link);
322 if (!link) {
323 ret = -ENOMEM;
324 goto free;
325 }
326 links[link_id] = link;
327 }
328
329 /* keep track of the old pointers for the driver */
330 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
331 memcpy(old, sdata->vif.link_conf, sizeof(old));
332 /* and for us in error cases */
333 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
334 memcpy(old_data, sdata->link, sizeof(old_data));
335
336 /* grab old links to free later */
337 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
338 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
339 /*
340 * we must have allocated the data through this path so
341 * we know we can free both at the same time
342 */
343 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
344 typeof(*links[link_id]),
345 data);
346 }
347
348 RCU_INIT_POINTER(sdata->link[link_id], NULL);
349 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
350 }
351
352 if (!old_links)
353 ieee80211_debugfs_recreate_netdev(sdata, true);
354
355 /* link them into data structures */
356 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
357 WARN_ON(!use_deflink &&
358 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
359
360 link = links[link_id];
361 ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
362 ieee80211_link_setup(&link->data);
363 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
364 ieee80211_set_wmm_default(&link->data, true, non_sta);
365 }
366
367 if (new_links == 0)
368 ieee80211_link_init(sdata, -1, &sdata->deflink,
369 &sdata->vif.bss_conf);
370
371 ret = ieee80211_check_dup_link_addrs(sdata);
372 if (!ret) {
373 /* for keys we will not be able to undo this */
374 ieee80211_tear_down_links(sdata, to_free, rem);
375
376 ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links);
377
378 /* tell the driver */
379 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
380 ret = drv_change_vif_links(sdata->local, sdata,
381 old_links & old_active,
382 new_links & sdata->vif.active_links,
383 old);
384 if (!new_links)
385 ieee80211_debugfs_recreate_netdev(sdata, false);
386
387 if (sdata->vif.type == NL80211_IFTYPE_AP)
388 ieee80211_update_apvlan_links(sdata);
389 }
390
391 /*
392 * Ignore errors if we are only removing links as removal should
393 * always succeed
394 */
395 if (!new_links)
396 ret = 0;
397
398 if (ret) {
399 /* restore config */
400 memcpy(sdata->link, old_data, sizeof(old_data));
401 memcpy(sdata->vif.link_conf, old, sizeof(old));
402 ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links);
403 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
404 ieee80211_link_debugfs_remove(&links[link_id]->data);
405 ieee80211_link_stop(&links[link_id]->data);
406 }
407 /* and free (only) the newly allocated links */
408 memset(to_free, 0, sizeof(links));
409 goto free;
410 }
411
412 /* try to remove links that are now invalid from (MLO) stations */
413 list_for_each_entry(sta, &sdata->local->sta_list, list) {
414 unsigned long rem_links = sta->sta.valid_links & sta_rem;
415
416 if (sta->sdata != sdata)
417 continue;
418
419 /*
420 * skip stations that would have no links left,
421 * those will be removed completely later
422 */
423 if (sta->sta.valid_links == rem_links)
424 continue;
425
426 for_each_set_bit(link_id, &rem_links,
427 IEEE80211_MLD_MAX_NUM_LINKS)
428 ieee80211_sta_remove_link(sta, link_id);
429 }
430
431 /*
432 * Remove stations using any removed links. Note that due
433 * to the above station link removal, this only removes
434 * stations that were skipped above because they'd have no
435 * links left after link removal.
436 */
437 for_each_set_bit(link_id, &sta_rem, IEEE80211_MLD_MAX_NUM_LINKS)
438 sta_info_flush(sdata, link_id);
439
440 /* use deflink/bss_conf again if and only if there are no more links */
441 use_deflink = new_links == 0;
442
443 goto deinit;
444free:
445 /* if we failed during allocation, only free all */
446 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
447 kfree(links[link_id]);
448 links[link_id] = NULL;
449 }
450deinit:
451 if (use_deflink)
452 ieee80211_link_init(sdata, -1, &sdata->deflink,
453 &sdata->vif.bss_conf);
454 return ret;
455}
456
457int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
458 u16 new_links, u16 dormant_links)
459{
460 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
461 int ret;
462
463 ret = ieee80211_vif_update_links(sdata, links, new_links,
464 dormant_links);
465 ieee80211_free_links(sdata, links);
466
467 return ret;
468}
469
470static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
471 u16 active_links)
472{
473 struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
474 struct ieee80211_local *local = sdata->local;
475 u16 old_active = sdata->vif.active_links;
476 unsigned long rem = old_active & ~active_links;
477 unsigned long add = active_links & ~old_active;
478 struct sta_info *sta;
479 unsigned int link_id;
480 int ret, i;
481
482 if (!ieee80211_sdata_running(sdata))
483 return -ENETDOWN;
484
485 if (sdata->vif.type != NL80211_IFTYPE_STATION)
486 return -EINVAL;
487
488 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
489 return -EINVAL;
490
491 /* nothing to do */
492 if (old_active == active_links)
493 return 0;
494
495 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
496 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
497 sdata);
498
499 if (add) {
500 sdata->vif.active_links |= active_links;
501 ret = drv_change_vif_links(local, sdata,
502 old_active,
503 sdata->vif.active_links,
504 link_confs);
505 if (ret) {
506 sdata->vif.active_links = old_active;
507 return ret;
508 }
509 }
510
511 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
512 struct ieee80211_link_data *link;
513
514 link = sdata_dereference(sdata->link[link_id], sdata);
515
516 ieee80211_teardown_tdls_peers(link);
517
518 __ieee80211_link_release_channel(link, true);
519
520 /*
521 * If CSA is (still) active while the link is deactivated,
522 * just schedule the channel switch work for the time we
523 * had previously calculated, and we'll take the process
524 * from there.
525 */
526 if (link->conf->csa_active)
527 wiphy_hrtimer_work_queue(local->hw.wiphy,
528 &link->u.mgd.csa.switch_work,
529 link->u.mgd.csa.time -
530 ktime_get_boottime());
531 }
532
533 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
534 struct ieee80211_link_data *link;
535
536 link = sdata_dereference(sdata->link[link_id], sdata);
537
538 /*
539 * This call really should not fail. Unfortunately, it appears
540 * that this may happen occasionally with some drivers. Should
541 * it happen, we are stuck in a bad place as going backwards is
542 * not really feasible.
543 *
544 * So lets just tell link_use_channel that it must not fail to
545 * assign the channel context (from mac80211's perspective) and
546 * assume the driver is going to trigger a recovery flow if it
547 * had a failure.
548 * That really is not great nor guaranteed to work. But at least
549 * the internal mac80211 state remains consistent and there is
550 * a chance that we can recover.
551 */
552 ret = _ieee80211_link_use_channel(link,
553 &link->conf->chanreq,
554 IEEE80211_CHANCTX_SHARED,
555 true);
556 WARN_ON_ONCE(ret);
557
558 /*
559 * inform about the link info changed parameters after all
560 * stations are also added
561 */
562 }
563
564 list_for_each_entry(sta, &local->sta_list, list) {
565 if (sdata != sta->sdata)
566 continue;
567
568 /* this is very temporary, but do it anyway */
569 __ieee80211_sta_recalc_aggregates(sta,
570 old_active | active_links);
571
572 ret = drv_change_sta_links(local, sdata, &sta->sta,
573 old_active,
574 old_active | active_links);
575 WARN_ON_ONCE(ret);
576 }
577
578 ret = ieee80211_key_switch_links(sdata, rem, add);
579 WARN_ON_ONCE(ret);
580
581 list_for_each_entry(sta, &local->sta_list, list) {
582 if (sdata != sta->sdata)
583 continue;
584
585 __ieee80211_sta_recalc_aggregates(sta, active_links);
586
587 ret = drv_change_sta_links(local, sdata, &sta->sta,
588 old_active | active_links,
589 active_links);
590 WARN_ON_ONCE(ret);
591
592 /*
593 * Do it again, just in case - the driver might very
594 * well have called ieee80211_sta_recalc_aggregates()
595 * from there when filling in the new links, which
596 * would set it wrong since the vif's active links are
597 * not switched yet...
598 */
599 __ieee80211_sta_recalc_aggregates(sta, active_links);
600 }
601
602 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
603 struct ieee80211_link_data *link;
604
605 link = sdata_dereference(sdata->link[link_id], sdata);
606
607 ieee80211_mgd_set_link_qos_params(link);
608 ieee80211_link_info_change_notify(sdata, link,
609 BSS_CHANGED_ERP_CTS_PROT |
610 BSS_CHANGED_ERP_PREAMBLE |
611 BSS_CHANGED_ERP_SLOT |
612 BSS_CHANGED_HT |
613 BSS_CHANGED_BASIC_RATES |
614 BSS_CHANGED_BSSID |
615 BSS_CHANGED_CQM |
616 BSS_CHANGED_QOS |
617 BSS_CHANGED_TXPOWER |
618 BSS_CHANGED_BANDWIDTH |
619 BSS_CHANGED_TWT |
620 BSS_CHANGED_HE_OBSS_PD |
621 BSS_CHANGED_HE_BSS_COLOR);
622 }
623
624 old_active = sdata->vif.active_links;
625 sdata->vif.active_links = active_links;
626
627 if (rem) {
628 ret = drv_change_vif_links(local, sdata, old_active,
629 active_links, link_confs);
630 WARN_ON_ONCE(ret);
631 }
632
633 return 0;
634}
635
636int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
637{
638 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
639 struct ieee80211_local *local = sdata->local;
640 u16 old_active;
641 int ret;
642
643 lockdep_assert_wiphy(local->hw.wiphy);
644
645 if (WARN_ON(!active_links))
646 return -EINVAL;
647
648 old_active = sdata->vif.active_links;
649 if (old_active == active_links)
650 return 0;
651
652 if (!drv_can_activate_links(local, sdata, active_links))
653 return -EINVAL;
654
655 if (old_active & active_links) {
656 /*
657 * if there's at least one link that stays active across
658 * the change then switch to it (to those) first, and
659 * then enable the additional links
660 */
661 ret = _ieee80211_set_active_links(sdata,
662 old_active & active_links);
663 if (!ret)
664 ret = _ieee80211_set_active_links(sdata, active_links);
665 } else {
666 /* otherwise switch directly */
667 ret = _ieee80211_set_active_links(sdata, active_links);
668 }
669
670 return ret;
671}
672EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
673
674void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
675 u16 active_links)
676{
677 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
678
679 if (WARN_ON(!active_links))
680 return;
681
682 if (!ieee80211_sdata_running(sdata))
683 return;
684
685 if (sdata->vif.type != NL80211_IFTYPE_STATION)
686 return;
687
688 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
689 return;
690
691 /* nothing to do */
692 if (sdata->vif.active_links == active_links)
693 return;
694
695 sdata->desired_active_links = active_links;
696 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
697}
698EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);