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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * MLO link handling
4 *
5 * Copyright (C) 2022-2023 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
40 wiphy_work_init(&link->csa_finalize_work,
41 ieee80211_csa_finalize_work);
42 wiphy_work_init(&link->color_change_finalize_work,
43 ieee80211_color_change_finalize_work);
44 INIT_DELAYED_WORK(&link->color_collision_detect_work,
45 ieee80211_color_collision_detection_work);
46 INIT_LIST_HEAD(&link->assigned_chanctx_list);
47 INIT_LIST_HEAD(&link->reserved_chanctx_list);
48 wiphy_delayed_work_init(&link->dfs_cac_timer_work,
49 ieee80211_dfs_cac_timer_work);
50
51 if (!deflink) {
52 switch (sdata->vif.type) {
53 case NL80211_IFTYPE_AP:
54 ether_addr_copy(link_conf->addr,
55 sdata->wdev.links[link_id].addr);
56 link_conf->bssid = link_conf->addr;
57 WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
58 break;
59 case NL80211_IFTYPE_STATION:
60 /* station sets the bssid in ieee80211_mgd_setup_link */
61 break;
62 default:
63 WARN_ON(1);
64 }
65
66 ieee80211_link_debugfs_add(link);
67 }
68}
69
70void ieee80211_link_stop(struct ieee80211_link_data *link)
71{
72 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
73 ieee80211_mgd_stop_link(link);
74
75 cancel_delayed_work_sync(&link->color_collision_detect_work);
76 ieee80211_link_release_channel(link);
77}
78
79struct link_container {
80 struct ieee80211_link_data data;
81 struct ieee80211_bss_conf conf;
82};
83
84static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
85 struct link_container **links, u16 mask)
86{
87 struct ieee80211_link_data *link;
88 LIST_HEAD(keys);
89 unsigned int link_id;
90
91 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
92 if (!(mask & BIT(link_id)))
93 continue;
94 link = &links[link_id]->data;
95 if (link_id == 0 && !link)
96 link = &sdata->deflink;
97 if (WARN_ON(!link))
98 continue;
99 ieee80211_remove_link_keys(link, &keys);
100 ieee80211_link_debugfs_remove(link);
101 ieee80211_link_stop(link);
102 }
103
104 synchronize_rcu();
105
106 ieee80211_free_key_list(sdata->local, &keys);
107}
108
109static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
110 struct link_container **links)
111{
112 unsigned int link_id;
113
114 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
115 kfree(links[link_id]);
116}
117
118static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
119{
120 unsigned int i, j;
121
122 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
123 struct ieee80211_link_data *link1;
124
125 link1 = sdata_dereference(sdata->link[i], sdata);
126 if (!link1)
127 continue;
128 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
129 struct ieee80211_link_data *link2;
130
131 link2 = sdata_dereference(sdata->link[j], sdata);
132 if (!link2)
133 continue;
134
135 if (ether_addr_equal(link1->conf->addr,
136 link2->conf->addr))
137 return -EALREADY;
138 }
139 }
140
141 return 0;
142}
143
144static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
145 u16 valid_links, u16 dormant_links)
146{
147 sdata->vif.valid_links = valid_links;
148 sdata->vif.dormant_links = dormant_links;
149
150 if (!valid_links ||
151 WARN((~valid_links & dormant_links) ||
152 !(valid_links & ~dormant_links),
153 "Invalid links: valid=0x%x, dormant=0x%x",
154 valid_links, dormant_links)) {
155 sdata->vif.active_links = 0;
156 sdata->vif.dormant_links = 0;
157 return;
158 }
159
160 switch (sdata->vif.type) {
161 case NL80211_IFTYPE_AP:
162 /* in an AP all links are always active */
163 sdata->vif.active_links = valid_links;
164
165 /* AP links are not expected to be disabled */
166 WARN_ON(dormant_links);
167 break;
168 case NL80211_IFTYPE_STATION:
169 if (sdata->vif.active_links)
170 break;
171 sdata->vif.active_links = valid_links & ~dormant_links;
172 WARN_ON(hweight16(sdata->vif.active_links) > 1);
173 break;
174 default:
175 WARN_ON(1);
176 }
177}
178
179static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
180 struct link_container **to_free,
181 u16 new_links, u16 dormant_links)
182{
183 u16 old_links = sdata->vif.valid_links;
184 u16 old_active = sdata->vif.active_links;
185 unsigned long add = new_links & ~old_links;
186 unsigned long rem = old_links & ~new_links;
187 unsigned int link_id;
188 int ret;
189 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
190 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
191 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
192 bool use_deflink = old_links == 0; /* set for error case */
193
194 lockdep_assert_wiphy(sdata->local->hw.wiphy);
195
196 memset(to_free, 0, sizeof(links));
197
198 if (old_links == new_links && dormant_links == sdata->vif.dormant_links)
199 return 0;
200
201 /* if there were no old links, need to clear the pointers to deflink */
202 if (!old_links)
203 rem |= BIT(0);
204
205 /* allocate new link structures first */
206 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
207 link = kzalloc(sizeof(*link), GFP_KERNEL);
208 if (!link) {
209 ret = -ENOMEM;
210 goto free;
211 }
212 links[link_id] = link;
213 }
214
215 /* keep track of the old pointers for the driver */
216 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
217 memcpy(old, sdata->vif.link_conf, sizeof(old));
218 /* and for us in error cases */
219 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
220 memcpy(old_data, sdata->link, sizeof(old_data));
221
222 /* grab old links to free later */
223 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
224 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
225 /*
226 * we must have allocated the data through this path so
227 * we know we can free both at the same time
228 */
229 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
230 typeof(*links[link_id]),
231 data);
232 }
233
234 RCU_INIT_POINTER(sdata->link[link_id], NULL);
235 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
236 }
237
238 if (!old_links)
239 ieee80211_debugfs_recreate_netdev(sdata, true);
240
241 /* link them into data structures */
242 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
243 WARN_ON(!use_deflink &&
244 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
245
246 link = links[link_id];
247 ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
248 ieee80211_link_setup(&link->data);
249 }
250
251 if (new_links == 0)
252 ieee80211_link_init(sdata, -1, &sdata->deflink,
253 &sdata->vif.bss_conf);
254
255 ret = ieee80211_check_dup_link_addrs(sdata);
256 if (!ret) {
257 /* for keys we will not be able to undo this */
258 ieee80211_tear_down_links(sdata, to_free, rem);
259
260 ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links);
261
262 /* tell the driver */
263 ret = drv_change_vif_links(sdata->local, sdata,
264 old_links & old_active,
265 new_links & sdata->vif.active_links,
266 old);
267 if (!new_links)
268 ieee80211_debugfs_recreate_netdev(sdata, false);
269 }
270
271 if (ret) {
272 /* restore config */
273 memcpy(sdata->link, old_data, sizeof(old_data));
274 memcpy(sdata->vif.link_conf, old, sizeof(old));
275 ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links);
276 /* and free (only) the newly allocated links */
277 memset(to_free, 0, sizeof(links));
278 goto free;
279 }
280
281 /* use deflink/bss_conf again if and only if there are no more links */
282 use_deflink = new_links == 0;
283
284 goto deinit;
285free:
286 /* if we failed during allocation, only free all */
287 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
288 kfree(links[link_id]);
289 links[link_id] = NULL;
290 }
291deinit:
292 if (use_deflink)
293 ieee80211_link_init(sdata, -1, &sdata->deflink,
294 &sdata->vif.bss_conf);
295 return ret;
296}
297
298int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
299 u16 new_links, u16 dormant_links)
300{
301 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
302 int ret;
303
304 ret = ieee80211_vif_update_links(sdata, links, new_links,
305 dormant_links);
306 ieee80211_free_links(sdata, links);
307
308 return ret;
309}
310
311static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
312 u16 active_links)
313{
314 struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
315 struct ieee80211_local *local = sdata->local;
316 u16 old_active = sdata->vif.active_links;
317 unsigned long rem = old_active & ~active_links;
318 unsigned long add = active_links & ~old_active;
319 struct sta_info *sta;
320 unsigned int link_id;
321 int ret, i;
322
323 if (!ieee80211_sdata_running(sdata))
324 return -ENETDOWN;
325
326 if (sdata->vif.type != NL80211_IFTYPE_STATION)
327 return -EINVAL;
328
329 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
330 return -EINVAL;
331
332 /* nothing to do */
333 if (old_active == active_links)
334 return 0;
335
336 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
337 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
338 sdata);
339
340 if (add) {
341 sdata->vif.active_links |= active_links;
342 ret = drv_change_vif_links(local, sdata,
343 old_active,
344 sdata->vif.active_links,
345 link_confs);
346 if (ret) {
347 sdata->vif.active_links = old_active;
348 return ret;
349 }
350 }
351
352 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
353 struct ieee80211_link_data *link;
354
355 link = sdata_dereference(sdata->link[link_id], sdata);
356
357 /* FIXME: kill TDLS connections on the link */
358
359 ieee80211_link_release_channel(link);
360 }
361
362 list_for_each_entry(sta, &local->sta_list, list) {
363 if (sdata != sta->sdata)
364 continue;
365
366 /* this is very temporary, but do it anyway */
367 __ieee80211_sta_recalc_aggregates(sta,
368 old_active | active_links);
369
370 ret = drv_change_sta_links(local, sdata, &sta->sta,
371 old_active,
372 old_active | active_links);
373 WARN_ON_ONCE(ret);
374 }
375
376 ret = ieee80211_key_switch_links(sdata, rem, add);
377 WARN_ON_ONCE(ret);
378
379 list_for_each_entry(sta, &local->sta_list, list) {
380 if (sdata != sta->sdata)
381 continue;
382
383 __ieee80211_sta_recalc_aggregates(sta, active_links);
384
385 ret = drv_change_sta_links(local, sdata, &sta->sta,
386 old_active | active_links,
387 active_links);
388 WARN_ON_ONCE(ret);
389
390 /*
391 * Do it again, just in case - the driver might very
392 * well have called ieee80211_sta_recalc_aggregates()
393 * from there when filling in the new links, which
394 * would set it wrong since the vif's active links are
395 * not switched yet...
396 */
397 __ieee80211_sta_recalc_aggregates(sta, active_links);
398 }
399
400 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
401 struct ieee80211_link_data *link;
402
403 link = sdata_dereference(sdata->link[link_id], sdata);
404
405 ret = ieee80211_link_use_channel(link, &link->conf->chandef,
406 IEEE80211_CHANCTX_SHARED);
407 WARN_ON_ONCE(ret);
408
409 ieee80211_mgd_set_link_qos_params(link);
410 ieee80211_link_info_change_notify(sdata, link,
411 BSS_CHANGED_ERP_CTS_PROT |
412 BSS_CHANGED_ERP_PREAMBLE |
413 BSS_CHANGED_ERP_SLOT |
414 BSS_CHANGED_HT |
415 BSS_CHANGED_BASIC_RATES |
416 BSS_CHANGED_BSSID |
417 BSS_CHANGED_CQM |
418 BSS_CHANGED_QOS |
419 BSS_CHANGED_TXPOWER |
420 BSS_CHANGED_BANDWIDTH |
421 BSS_CHANGED_TWT |
422 BSS_CHANGED_HE_OBSS_PD |
423 BSS_CHANGED_HE_BSS_COLOR);
424 }
425
426 old_active = sdata->vif.active_links;
427 sdata->vif.active_links = active_links;
428
429 if (rem) {
430 ret = drv_change_vif_links(local, sdata, old_active,
431 active_links, link_confs);
432 WARN_ON_ONCE(ret);
433 }
434
435 return 0;
436}
437
438int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
439{
440 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
441 struct ieee80211_local *local = sdata->local;
442 u16 old_active;
443 int ret;
444
445 lockdep_assert_wiphy(local->hw.wiphy);
446
447 if (!drv_can_activate_links(local, sdata, active_links))
448 return -EINVAL;
449
450 old_active = sdata->vif.active_links;
451 if (old_active & active_links) {
452 /*
453 * if there's at least one link that stays active across
454 * the change then switch to it (to those) first, and
455 * then enable the additional links
456 */
457 ret = _ieee80211_set_active_links(sdata,
458 old_active & active_links);
459 if (!ret)
460 ret = _ieee80211_set_active_links(sdata, active_links);
461 } else {
462 /* otherwise switch directly */
463 ret = _ieee80211_set_active_links(sdata, active_links);
464 }
465
466 return ret;
467}
468EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
469
470void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
471 u16 active_links)
472{
473 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
474
475 if (!ieee80211_sdata_running(sdata))
476 return;
477
478 if (sdata->vif.type != NL80211_IFTYPE_STATION)
479 return;
480
481 if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
482 return;
483
484 /* nothing to do */
485 if (sdata->vif.active_links == active_links)
486 return;
487
488 sdata->desired_active_links = active_links;
489 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
490}
491EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);