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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MLO link handling
4 *
5 * Copyright (C) 2022-2024 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
15void ieee80211_link_setup(struct ieee80211_link_data *link)
16{
17 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
18 ieee80211_mgd_setup_link(link);
19}
20
21void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
22 int link_id,
23 struct ieee80211_link_data *link,
24 struct ieee80211_bss_conf *link_conf)
25{
26 bool deflink = link_id < 0;
27
28 if (link_id < 0)
29 link_id = 0;
30
31 rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
32 rcu_assign_pointer(sdata->link[link_id], link);
33
34 link->sdata = sdata;
35 link->link_id = link_id;
36 link->conf = link_conf;
37 link_conf->link_id = link_id;
38 link_conf->vif = &sdata->vif;
39 link->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
40 link->user_power_level = sdata->local->user_power_level;
41 link_conf->txpower = INT_MIN;
42
43 wiphy_work_init(&link->csa.finalize_work,
44 ieee80211_csa_finalize_work);
45 wiphy_work_init(&link->color_change_finalize_work,
46 ieee80211_color_change_finalize_work);
47 wiphy_delayed_work_init(&link->color_collision_detect_work,
48 ieee80211_color_collision_detection_work);
49 INIT_LIST_HEAD(&link->assigned_chanctx_list);
50 INIT_LIST_HEAD(&link->reserved_chanctx_list);
51 wiphy_delayed_work_init(&link->dfs_cac_timer_work,
52 ieee80211_dfs_cac_timer_work);
53
54 if (!deflink) {
55 switch (sdata->vif.type) {
56 case NL80211_IFTYPE_AP:
57 ether_addr_copy(link_conf->addr,
58 sdata->wdev.links[link_id].addr);
59 link_conf->bssid = link_conf->addr;
60 WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
61 break;
62 case NL80211_IFTYPE_STATION:
63 /* station sets the bssid in ieee80211_mgd_setup_link */
64 break;
65 default:
66 WARN_ON(1);
67 }
68
69 ieee80211_link_debugfs_add(link);
70 }
71}
72
73void ieee80211_link_stop(struct ieee80211_link_data *link)
74{
75 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
76 ieee80211_mgd_stop_link(link);
77
78 wiphy_delayed_work_cancel(link->sdata->local->hw.wiphy,
79 &link->color_collision_detect_work);
80 wiphy_work_cancel(link->sdata->local->hw.wiphy,
81 &link->color_change_finalize_work);
82 wiphy_work_cancel(link->sdata->local->hw.wiphy,
83 &link->csa.finalize_work);
84
85 if (link->sdata->wdev.links[link->link_id].cac_started) {
86 wiphy_delayed_work_cancel(link->sdata->local->hw.wiphy,
87 &link->dfs_cac_timer_work);
88 cfg80211_cac_event(link->sdata->dev,
89 &link->conf->chanreq.oper,
90 NL80211_RADAR_CAC_ABORTED,
91 GFP_KERNEL, link->link_id);
92 }
93
94 ieee80211_link_release_channel(link);
95}
96
97struct link_container {
98 struct ieee80211_link_data data;
99 struct ieee80211_bss_conf conf;
100};
101
102static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
103 struct link_container **links, u16 mask)
104{
105 struct ieee80211_link_data *link;
106 LIST_HEAD(keys);
107 unsigned int link_id;
108
109 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
110 if (!(mask & BIT(link_id)))
111 continue;
112 link = &links[link_id]->data;
113 if (link_id == 0 && !link)
114 link = &sdata->deflink;
115 if (WARN_ON(!link))
116 continue;
117 ieee80211_remove_link_keys(link, &keys);
118 ieee80211_link_debugfs_remove(link);
119 ieee80211_link_stop(link);
120 }
121
122 synchronize_rcu();
123
124 ieee80211_free_key_list(sdata->local, &keys);
125}
126
127static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
128 struct link_container **links)
129{
130 unsigned int link_id;
131
132 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
133 kfree(links[link_id]);
134}
135
136static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
137{
138 unsigned int i, j;
139
140 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
141 struct ieee80211_link_data *link1;
142
143 link1 = sdata_dereference(sdata->link[i], sdata);
144 if (!link1)
145 continue;
146 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
147 struct ieee80211_link_data *link2;
148
149 link2 = sdata_dereference(sdata->link[j], sdata);
150 if (!link2)
151 continue;
152
153 if (ether_addr_equal(link1->conf->addr,
154 link2->conf->addr))
155 return -EALREADY;
156 }
157 }
158
159 return 0;
160}
161
162static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
163 u16 valid_links, u16 dormant_links)
164{
165 sdata->vif.valid_links = valid_links;
166 sdata->vif.dormant_links = dormant_links;
167
168 if (!valid_links ||
169 WARN((~valid_links & dormant_links) ||
170 !(valid_links & ~dormant_links),
171 "Invalid links: valid=0x%x, dormant=0x%x",
172 valid_links, dormant_links)) {
173 sdata->vif.active_links = 0;
174 sdata->vif.dormant_links = 0;
175 return;
176 }
177
178 switch (sdata->vif.type) {
179 case NL80211_IFTYPE_AP:
180 /* in an AP all links are always active */
181 sdata->vif.active_links = valid_links;
182
183 /* AP links are not expected to be disabled */
184 WARN_ON(dormant_links);
185 break;
186 case NL80211_IFTYPE_STATION:
187 if (sdata->vif.active_links)
188 break;
189 sdata->vif.active_links = valid_links & ~dormant_links;
190 WARN_ON(hweight16(sdata->vif.active_links) > 1);
191 break;
192 default:
193 WARN_ON(1);
194 }
195}
196
197static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
198 struct link_container **to_free,
199 u16 new_links, u16 dormant_links)
200{
201 u16 old_links = sdata->vif.valid_links;
202 u16 old_active = sdata->vif.active_links;
203 unsigned long add = new_links & ~old_links;
204 unsigned long rem = old_links & ~new_links;
205 unsigned int link_id;
206 int ret;
207 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
208 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
209 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
210 bool use_deflink = old_links == 0; /* set for error case */
211
212 lockdep_assert_wiphy(sdata->local->hw.wiphy);
213
214 memset(to_free, 0, sizeof(links));
215
216 if (old_links == new_links && dormant_links == sdata->vif.dormant_links)
217 return 0;
218
219 /* if there were no old links, need to clear the pointers to deflink */
220 if (!old_links)
221 rem |= BIT(0);
222
223 /* allocate new link structures first */
224 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
225 link = kzalloc(sizeof(*link), GFP_KERNEL);
226 if (!link) {
227 ret = -ENOMEM;
228 goto free;
229 }
230 links[link_id] = link;
231 }
232
233 /* keep track of the old pointers for the driver */
234 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
235 memcpy(old, sdata->vif.link_conf, sizeof(old));
236 /* and for us in error cases */
237 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
238 memcpy(old_data, sdata->link, sizeof(old_data));
239
240 /* grab old links to free later */
241 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
242 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
243 /*
244 * we must have allocated the data through this path so
245 * we know we can free both at the same time
246 */
247 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
248 typeof(*links[link_id]),
249 data);
250 }
251
252 RCU_INIT_POINTER(sdata->link[link_id], NULL);
253 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
254 }
255
256 if (!old_links)
257 ieee80211_debugfs_recreate_netdev(sdata, true);
258
259 /* link them into data structures */
260 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
261 WARN_ON(!use_deflink &&
262 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
263
264 link = links[link_id];
265 ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
266 ieee80211_link_setup(&link->data);
267 }
268
269 if (new_links == 0)
270 ieee80211_link_init(sdata, -1, &sdata->deflink,
271 &sdata->vif.bss_conf);
272
273 ret = ieee80211_check_dup_link_addrs(sdata);
274 if (!ret) {
275 /* for keys we will not be able to undo this */
276 ieee80211_tear_down_links(sdata, to_free, rem);
277
278 ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links);
279
280 /* tell the driver */
281 ret = drv_change_vif_links(sdata->local, sdata,
282 old_links & old_active,
283 new_links & sdata->vif.active_links,
284 old);
285 if (!new_links)
286 ieee80211_debugfs_recreate_netdev(sdata, false);
287 }
288
289 if (ret) {
290 /* restore config */
291 memcpy(sdata->link, old_data, sizeof(old_data));
292 memcpy(sdata->vif.link_conf, old, sizeof(old));
293 ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links);
294 /* and free (only) the newly allocated links */
295 memset(to_free, 0, sizeof(links));
296 goto free;
297 }
298
299 /* use deflink/bss_conf again if and only if there are no more links */
300 use_deflink = new_links == 0;
301
302 goto deinit;
303free:
304 /* if we failed during allocation, only free all */
305 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
306 kfree(links[link_id]);
307 links[link_id] = NULL;
308 }
309deinit:
310 if (use_deflink)
311 ieee80211_link_init(sdata, -1, &sdata->deflink,
312 &sdata->vif.bss_conf);
313 return ret;
314}
315
316int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
317 u16 new_links, u16 dormant_links)
318{
319 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
320 int ret;
321
322 ret = ieee80211_vif_update_links(sdata, links, new_links,
323 dormant_links);
324 ieee80211_free_links(sdata, links);
325
326 return ret;
327}
328
329static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
330 u16 active_links)
331{
332 struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
333 struct ieee80211_local *local = sdata->local;
334 u16 old_active = sdata->vif.active_links;
335 unsigned long rem = old_active & ~active_links;
336 unsigned long add = active_links & ~old_active;
337 struct sta_info *sta;
338 unsigned int link_id;
339 int ret, i;
340
341 if (!ieee80211_sdata_running(sdata))
342 return -ENETDOWN;
343
344 if (sdata->vif.type != NL80211_IFTYPE_STATION)
345 return -EINVAL;
346
347 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
348 return -EINVAL;
349
350 /* nothing to do */
351 if (old_active == active_links)
352 return 0;
353
354 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
355 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
356 sdata);
357
358 if (add) {
359 sdata->vif.active_links |= active_links;
360 ret = drv_change_vif_links(local, sdata,
361 old_active,
362 sdata->vif.active_links,
363 link_confs);
364 if (ret) {
365 sdata->vif.active_links = old_active;
366 return ret;
367 }
368 }
369
370 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
371 struct ieee80211_link_data *link;
372
373 link = sdata_dereference(sdata->link[link_id], sdata);
374
375 ieee80211_teardown_tdls_peers(link);
376
377 __ieee80211_link_release_channel(link, true);
378
379 /*
380 * If CSA is (still) active while the link is deactivated,
381 * just schedule the channel switch work for the time we
382 * had previously calculated, and we'll take the process
383 * from there.
384 */
385 if (link->conf->csa_active)
386 wiphy_delayed_work_queue(local->hw.wiphy,
387 &link->u.mgd.csa.switch_work,
388 link->u.mgd.csa.time -
389 jiffies);
390 }
391
392 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
393 struct ieee80211_link_data *link;
394
395 link = sdata_dereference(sdata->link[link_id], sdata);
396
397 /*
398 * This call really should not fail. Unfortunately, it appears
399 * that this may happen occasionally with some drivers. Should
400 * it happen, we are stuck in a bad place as going backwards is
401 * not really feasible.
402 *
403 * So lets just tell link_use_channel that it must not fail to
404 * assign the channel context (from mac80211's perspective) and
405 * assume the driver is going to trigger a recovery flow if it
406 * had a failure.
407 * That really is not great nor guaranteed to work. But at least
408 * the internal mac80211 state remains consistent and there is
409 * a chance that we can recover.
410 */
411 ret = _ieee80211_link_use_channel(link,
412 &link->conf->chanreq,
413 IEEE80211_CHANCTX_SHARED,
414 true);
415 WARN_ON_ONCE(ret);
416
417 /*
418 * inform about the link info changed parameters after all
419 * stations are also added
420 */
421 }
422
423 list_for_each_entry(sta, &local->sta_list, list) {
424 if (sdata != sta->sdata)
425 continue;
426
427 /* this is very temporary, but do it anyway */
428 __ieee80211_sta_recalc_aggregates(sta,
429 old_active | active_links);
430
431 ret = drv_change_sta_links(local, sdata, &sta->sta,
432 old_active,
433 old_active | active_links);
434 WARN_ON_ONCE(ret);
435 }
436
437 ret = ieee80211_key_switch_links(sdata, rem, add);
438 WARN_ON_ONCE(ret);
439
440 list_for_each_entry(sta, &local->sta_list, list) {
441 if (sdata != sta->sdata)
442 continue;
443
444 __ieee80211_sta_recalc_aggregates(sta, active_links);
445
446 ret = drv_change_sta_links(local, sdata, &sta->sta,
447 old_active | active_links,
448 active_links);
449 WARN_ON_ONCE(ret);
450
451 /*
452 * Do it again, just in case - the driver might very
453 * well have called ieee80211_sta_recalc_aggregates()
454 * from there when filling in the new links, which
455 * would set it wrong since the vif's active links are
456 * not switched yet...
457 */
458 __ieee80211_sta_recalc_aggregates(sta, active_links);
459 }
460
461 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
462 struct ieee80211_link_data *link;
463
464 link = sdata_dereference(sdata->link[link_id], sdata);
465
466 ieee80211_mgd_set_link_qos_params(link);
467 ieee80211_link_info_change_notify(sdata, link,
468 BSS_CHANGED_ERP_CTS_PROT |
469 BSS_CHANGED_ERP_PREAMBLE |
470 BSS_CHANGED_ERP_SLOT |
471 BSS_CHANGED_HT |
472 BSS_CHANGED_BASIC_RATES |
473 BSS_CHANGED_BSSID |
474 BSS_CHANGED_CQM |
475 BSS_CHANGED_QOS |
476 BSS_CHANGED_TXPOWER |
477 BSS_CHANGED_BANDWIDTH |
478 BSS_CHANGED_TWT |
479 BSS_CHANGED_HE_OBSS_PD |
480 BSS_CHANGED_HE_BSS_COLOR);
481 }
482
483 old_active = sdata->vif.active_links;
484 sdata->vif.active_links = active_links;
485
486 if (rem) {
487 ret = drv_change_vif_links(local, sdata, old_active,
488 active_links, link_confs);
489 WARN_ON_ONCE(ret);
490 }
491
492 return 0;
493}
494
495int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
496{
497 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
498 struct ieee80211_local *local = sdata->local;
499 u16 old_active;
500 int ret;
501
502 lockdep_assert_wiphy(local->hw.wiphy);
503
504 if (WARN_ON(!active_links))
505 return -EINVAL;
506
507 old_active = sdata->vif.active_links;
508 if (old_active == active_links)
509 return 0;
510
511 if (!drv_can_activate_links(local, sdata, active_links))
512 return -EINVAL;
513
514 if (old_active & active_links) {
515 /*
516 * if there's at least one link that stays active across
517 * the change then switch to it (to those) first, and
518 * then enable the additional links
519 */
520 ret = _ieee80211_set_active_links(sdata,
521 old_active & active_links);
522 if (!ret)
523 ret = _ieee80211_set_active_links(sdata, active_links);
524 } else {
525 /* otherwise switch directly */
526 ret = _ieee80211_set_active_links(sdata, active_links);
527 }
528
529 return ret;
530}
531EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
532
533void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
534 u16 active_links)
535{
536 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
537
538 if (WARN_ON(!active_links))
539 return;
540
541 if (!ieee80211_sdata_running(sdata))
542 return;
543
544 if (sdata->vif.type != NL80211_IFTYPE_STATION)
545 return;
546
547 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
548 return;
549
550 /* nothing to do */
551 if (sdata->vif.active_links == active_links)
552 return;
553
554 sdata->desired_active_links = active_links;
555 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
556}
557EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);