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e73b5e51 JB |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * MLO link handling | |
4 | * | |
5 | * Copyright (C) 2022 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" | |
3d901102 | 12 | #include "key.h" |
e73b5e51 JB |
13 | |
14 | void ieee80211_link_setup(struct ieee80211_link_data *link) | |
15 | { | |
16 | if (link->sdata->vif.type == NL80211_IFTYPE_STATION) | |
17 | ieee80211_mgd_setup_link(link); | |
18 | } | |
19 | ||
20 | void ieee80211_link_init(struct ieee80211_sub_if_data *sdata, | |
21 | int link_id, | |
22 | struct ieee80211_link_data *link, | |
23 | struct ieee80211_bss_conf *link_conf) | |
24 | { | |
25 | bool deflink = link_id < 0; | |
26 | ||
27 | if (link_id < 0) | |
28 | link_id = 0; | |
29 | ||
30 | rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf); | |
31 | rcu_assign_pointer(sdata->link[link_id], link); | |
32 | ||
33 | link->sdata = sdata; | |
34 | link->link_id = link_id; | |
35 | link->conf = link_conf; | |
36 | link_conf->link_id = link_id; | |
37 | ||
38 | INIT_WORK(&link->csa_finalize_work, | |
39 | ieee80211_csa_finalize_work); | |
40 | INIT_WORK(&link->color_change_finalize_work, | |
41 | ieee80211_color_change_finalize_work); | |
92881884 LB |
42 | INIT_DELAYED_WORK(&link->color_collision_detect_work, |
43 | ieee80211_color_collision_detection_work); | |
e73b5e51 JB |
44 | INIT_LIST_HEAD(&link->assigned_chanctx_list); |
45 | INIT_LIST_HEAD(&link->reserved_chanctx_list); | |
46 | INIT_DELAYED_WORK(&link->dfs_cac_timer_work, | |
47 | ieee80211_dfs_cac_timer_work); | |
48 | ||
49 | if (!deflink) { | |
50 | switch (sdata->vif.type) { | |
51 | case NL80211_IFTYPE_AP: | |
52 | ether_addr_copy(link_conf->addr, | |
53 | sdata->wdev.links[link_id].addr); | |
54 | link_conf->bssid = link_conf->addr; | |
55 | WARN_ON(!(sdata->wdev.valid_links & BIT(link_id))); | |
56 | break; | |
57 | case NL80211_IFTYPE_STATION: | |
58 | /* station sets the bssid in ieee80211_mgd_setup_link */ | |
59 | break; | |
60 | default: | |
61 | WARN_ON(1); | |
62 | } | |
63 | } | |
64 | } | |
65 | ||
66 | void ieee80211_link_stop(struct ieee80211_link_data *link) | |
67 | { | |
68 | if (link->sdata->vif.type == NL80211_IFTYPE_STATION) | |
69 | ieee80211_mgd_stop_link(link); | |
70 | ||
92881884 | 71 | cancel_delayed_work_sync(&link->color_collision_detect_work); |
e73b5e51 JB |
72 | ieee80211_link_release_channel(link); |
73 | } | |
74 | ||
75 | struct link_container { | |
76 | struct ieee80211_link_data data; | |
77 | struct ieee80211_bss_conf conf; | |
78 | }; | |
79 | ||
efe9c2bf JB |
80 | static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata, |
81 | struct link_container **links, u16 mask) | |
e73b5e51 | 82 | { |
efe9c2bf | 83 | struct ieee80211_link_data *link; |
e73b5e51 JB |
84 | LIST_HEAD(keys); |
85 | unsigned int link_id; | |
86 | ||
87 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { | |
efe9c2bf JB |
88 | if (!(mask & BIT(link_id))) |
89 | continue; | |
90 | link = &links[link_id]->data; | |
91 | if (link_id == 0 && !link) | |
92 | link = &sdata->deflink; | |
93 | if (WARN_ON(!link)) | |
e73b5e51 | 94 | continue; |
efe9c2bf JB |
95 | ieee80211_remove_link_keys(link, &keys); |
96 | ieee80211_link_stop(link); | |
e73b5e51 JB |
97 | } |
98 | ||
99 | synchronize_rcu(); | |
100 | ||
101 | ieee80211_free_key_list(sdata->local, &keys); | |
efe9c2bf | 102 | } |
e73b5e51 | 103 | |
efe9c2bf JB |
104 | static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata, |
105 | struct link_container **links) | |
106 | { | |
107 | unsigned int link_id; | |
108 | ||
109 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) | |
e73b5e51 | 110 | kfree(links[link_id]); |
e73b5e51 JB |
111 | } |
112 | ||
113 | static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata) | |
114 | { | |
115 | unsigned int i, j; | |
116 | ||
117 | for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) { | |
118 | struct ieee80211_link_data *link1; | |
119 | ||
120 | link1 = sdata_dereference(sdata->link[i], sdata); | |
121 | if (!link1) | |
122 | continue; | |
123 | for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) { | |
124 | struct ieee80211_link_data *link2; | |
125 | ||
126 | link2 = sdata_dereference(sdata->link[j], sdata); | |
127 | if (!link2) | |
128 | continue; | |
129 | ||
130 | if (ether_addr_equal(link1->conf->addr, | |
131 | link2->conf->addr)) | |
132 | return -EALREADY; | |
133 | } | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
efe9c2bf JB |
139 | static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata, |
140 | u16 links) | |
141 | { | |
142 | sdata->vif.valid_links = links; | |
143 | ||
144 | if (!links) { | |
145 | sdata->vif.active_links = 0; | |
146 | return; | |
147 | } | |
148 | ||
149 | switch (sdata->vif.type) { | |
150 | case NL80211_IFTYPE_AP: | |
151 | /* in an AP all links are always active */ | |
152 | sdata->vif.active_links = links; | |
153 | break; | |
154 | case NL80211_IFTYPE_STATION: | |
155 | if (sdata->vif.active_links) | |
156 | break; | |
157 | WARN_ON(hweight16(links) > 1); | |
158 | sdata->vif.active_links = links; | |
159 | break; | |
160 | default: | |
161 | WARN_ON(1); | |
162 | } | |
163 | } | |
164 | ||
e73b5e51 JB |
165 | static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata, |
166 | struct link_container **to_free, | |
167 | u16 new_links) | |
168 | { | |
169 | u16 old_links = sdata->vif.valid_links; | |
efe9c2bf | 170 | u16 old_active = sdata->vif.active_links; |
e73b5e51 JB |
171 | unsigned long add = new_links & ~old_links; |
172 | unsigned long rem = old_links & ~new_links; | |
173 | unsigned int link_id; | |
174 | int ret; | |
175 | struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link; | |
176 | struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS]; | |
177 | struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS]; | |
178 | bool use_deflink = old_links == 0; /* set for error case */ | |
179 | ||
180 | sdata_assert_lock(sdata); | |
181 | ||
182 | memset(to_free, 0, sizeof(links)); | |
183 | ||
184 | if (old_links == new_links) | |
185 | return 0; | |
186 | ||
187 | /* if there were no old links, need to clear the pointers to deflink */ | |
188 | if (!old_links) | |
189 | rem |= BIT(0); | |
190 | ||
191 | /* allocate new link structures first */ | |
192 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
193 | link = kzalloc(sizeof(*link), GFP_KERNEL); | |
194 | if (!link) { | |
195 | ret = -ENOMEM; | |
196 | goto free; | |
197 | } | |
198 | links[link_id] = link; | |
199 | } | |
200 | ||
201 | /* keep track of the old pointers for the driver */ | |
202 | BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf)); | |
203 | memcpy(old, sdata->vif.link_conf, sizeof(old)); | |
204 | /* and for us in error cases */ | |
205 | BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link)); | |
206 | memcpy(old_data, sdata->link, sizeof(old_data)); | |
207 | ||
208 | /* grab old links to free later */ | |
209 | for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { | |
210 | if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) { | |
211 | /* | |
212 | * we must have allocated the data through this path so | |
213 | * we know we can free both at the same time | |
214 | */ | |
215 | to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]), | |
216 | typeof(*links[link_id]), | |
217 | data); | |
218 | } | |
219 | ||
220 | RCU_INIT_POINTER(sdata->link[link_id], NULL); | |
221 | RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL); | |
222 | } | |
223 | ||
224 | /* link them into data structures */ | |
225 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
226 | WARN_ON(!use_deflink && | |
227 | rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink); | |
228 | ||
229 | link = links[link_id]; | |
230 | ieee80211_link_init(sdata, link_id, &link->data, &link->conf); | |
231 | ieee80211_link_setup(&link->data); | |
232 | } | |
233 | ||
234 | if (new_links == 0) | |
235 | ieee80211_link_init(sdata, -1, &sdata->deflink, | |
236 | &sdata->vif.bss_conf); | |
237 | ||
e73b5e51 JB |
238 | ret = ieee80211_check_dup_link_addrs(sdata); |
239 | if (!ret) { | |
efe9c2bf JB |
240 | /* for keys we will not be able to undo this */ |
241 | ieee80211_tear_down_links(sdata, to_free, rem); | |
242 | ||
243 | ieee80211_set_vif_links_bitmaps(sdata, new_links); | |
244 | ||
e73b5e51 JB |
245 | /* tell the driver */ |
246 | ret = drv_change_vif_links(sdata->local, sdata, | |
efe9c2bf JB |
247 | old_links & old_active, |
248 | new_links & sdata->vif.active_links, | |
e73b5e51 JB |
249 | old); |
250 | } | |
251 | ||
252 | if (ret) { | |
253 | /* restore config */ | |
254 | memcpy(sdata->link, old_data, sizeof(old_data)); | |
255 | memcpy(sdata->vif.link_conf, old, sizeof(old)); | |
efe9c2bf | 256 | ieee80211_set_vif_links_bitmaps(sdata, old_links); |
e73b5e51 JB |
257 | /* and free (only) the newly allocated links */ |
258 | memset(to_free, 0, sizeof(links)); | |
259 | goto free; | |
260 | } | |
261 | ||
262 | /* use deflink/bss_conf again if and only if there are no more links */ | |
263 | use_deflink = new_links == 0; | |
264 | ||
265 | goto deinit; | |
266 | free: | |
267 | /* if we failed during allocation, only free all */ | |
268 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { | |
269 | kfree(links[link_id]); | |
270 | links[link_id] = NULL; | |
271 | } | |
272 | deinit: | |
273 | if (use_deflink) | |
274 | ieee80211_link_init(sdata, -1, &sdata->deflink, | |
275 | &sdata->vif.bss_conf); | |
276 | return ret; | |
277 | } | |
278 | ||
279 | int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata, | |
280 | u16 new_links) | |
281 | { | |
282 | struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS]; | |
283 | int ret; | |
284 | ||
285 | ret = ieee80211_vif_update_links(sdata, links, new_links); | |
286 | ieee80211_free_links(sdata, links); | |
287 | ||
288 | return ret; | |
289 | } | |
290 | ||
291 | void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata) | |
292 | { | |
293 | struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS]; | |
294 | ||
295 | /* | |
296 | * The locking here is different because when we free links | |
297 | * in the station case we need to be able to cancel_work_sync() | |
298 | * something that also takes the lock. | |
299 | */ | |
300 | ||
301 | sdata_lock(sdata); | |
302 | ieee80211_vif_update_links(sdata, links, 0); | |
303 | sdata_unlock(sdata); | |
304 | ||
305 | ieee80211_free_links(sdata, links); | |
306 | } | |
3d901102 JB |
307 | |
308 | static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata, | |
309 | u16 active_links) | |
310 | { | |
311 | struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS]; | |
312 | struct ieee80211_local *local = sdata->local; | |
313 | u16 old_active = sdata->vif.active_links; | |
314 | unsigned long rem = old_active & ~active_links; | |
315 | unsigned long add = active_links & ~old_active; | |
316 | struct sta_info *sta; | |
317 | unsigned int link_id; | |
318 | int ret, i; | |
319 | ||
320 | if (!ieee80211_sdata_running(sdata)) | |
321 | return -ENETDOWN; | |
322 | ||
323 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
324 | return -EINVAL; | |
325 | ||
326 | /* cannot activate links that don't exist */ | |
327 | if (active_links & ~sdata->vif.valid_links) | |
328 | return -EINVAL; | |
329 | ||
330 | /* nothing to do */ | |
331 | if (old_active == active_links) | |
332 | return 0; | |
333 | ||
334 | for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) | |
335 | link_confs[i] = sdata_dereference(sdata->vif.link_conf[i], | |
336 | sdata); | |
337 | ||
338 | if (add) { | |
339 | sdata->vif.active_links |= active_links; | |
340 | ret = drv_change_vif_links(local, sdata, | |
341 | old_active, | |
342 | sdata->vif.active_links, | |
343 | link_confs); | |
344 | if (ret) { | |
345 | sdata->vif.active_links = old_active; | |
346 | return ret; | |
347 | } | |
348 | } | |
349 | ||
350 | for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { | |
351 | struct ieee80211_link_data *link; | |
352 | ||
353 | link = sdata_dereference(sdata->link[link_id], sdata); | |
354 | ||
355 | /* FIXME: kill TDLS connections on the link */ | |
356 | ||
357 | ieee80211_link_release_channel(link); | |
358 | } | |
359 | ||
360 | list_for_each_entry(sta, &local->sta_list, list) { | |
361 | if (sdata != sta->sdata) | |
362 | continue; | |
9b41a9d7 JB |
363 | |
364 | /* this is very temporary, but do it anyway */ | |
365 | __ieee80211_sta_recalc_aggregates(sta, | |
366 | old_active | active_links); | |
367 | ||
3d901102 JB |
368 | ret = drv_change_sta_links(local, sdata, &sta->sta, |
369 | old_active, | |
370 | old_active | active_links); | |
371 | WARN_ON_ONCE(ret); | |
372 | } | |
373 | ||
374 | ret = ieee80211_key_switch_links(sdata, rem, add); | |
375 | WARN_ON_ONCE(ret); | |
376 | ||
377 | list_for_each_entry(sta, &local->sta_list, list) { | |
378 | if (sdata != sta->sdata) | |
379 | continue; | |
9b41a9d7 JB |
380 | |
381 | __ieee80211_sta_recalc_aggregates(sta, active_links); | |
382 | ||
3d901102 JB |
383 | ret = drv_change_sta_links(local, sdata, &sta->sta, |
384 | old_active | active_links, | |
385 | active_links); | |
386 | WARN_ON_ONCE(ret); | |
9b41a9d7 JB |
387 | |
388 | /* | |
389 | * Do it again, just in case - the driver might very | |
390 | * well have called ieee80211_sta_recalc_aggregates() | |
391 | * from there when filling in the new links, which | |
392 | * would set it wrong since the vif's active links are | |
393 | * not switched yet... | |
394 | */ | |
395 | __ieee80211_sta_recalc_aggregates(sta, active_links); | |
3d901102 JB |
396 | } |
397 | ||
398 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
399 | struct ieee80211_link_data *link; | |
400 | ||
401 | link = sdata_dereference(sdata->link[link_id], sdata); | |
402 | ||
403 | ret = ieee80211_link_use_channel(link, &link->conf->chandef, | |
404 | IEEE80211_CHANCTX_SHARED); | |
405 | WARN_ON_ONCE(ret); | |
406 | ||
407 | ieee80211_link_info_change_notify(sdata, link, | |
408 | BSS_CHANGED_ERP_CTS_PROT | | |
409 | BSS_CHANGED_ERP_PREAMBLE | | |
410 | BSS_CHANGED_ERP_SLOT | | |
411 | BSS_CHANGED_HT | | |
412 | BSS_CHANGED_BASIC_RATES | | |
413 | BSS_CHANGED_BSSID | | |
414 | BSS_CHANGED_CQM | | |
415 | BSS_CHANGED_QOS | | |
416 | BSS_CHANGED_TXPOWER | | |
417 | BSS_CHANGED_BANDWIDTH | | |
418 | BSS_CHANGED_TWT | | |
419 | BSS_CHANGED_HE_OBSS_PD | | |
420 | BSS_CHANGED_HE_BSS_COLOR); | |
421 | ieee80211_mgd_set_link_qos_params(link); | |
422 | } | |
423 | ||
424 | old_active = sdata->vif.active_links; | |
425 | sdata->vif.active_links = active_links; | |
426 | ||
427 | if (rem) { | |
428 | ret = drv_change_vif_links(local, sdata, old_active, | |
429 | active_links, link_confs); | |
430 | WARN_ON_ONCE(ret); | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links) | |
437 | { | |
438 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
439 | struct ieee80211_local *local = sdata->local; | |
440 | u16 old_active; | |
441 | int ret; | |
442 | ||
443 | sdata_lock(sdata); | |
444 | mutex_lock(&local->sta_mtx); | |
445 | mutex_lock(&local->mtx); | |
446 | mutex_lock(&local->key_mtx); | |
447 | old_active = sdata->vif.active_links; | |
448 | if (old_active & active_links) { | |
449 | /* | |
450 | * if there's at least one link that stays active across | |
451 | * the change then switch to it (to those) first, and | |
452 | * then enable the additional links | |
453 | */ | |
454 | ret = _ieee80211_set_active_links(sdata, | |
455 | old_active & active_links); | |
456 | if (!ret) | |
457 | ret = _ieee80211_set_active_links(sdata, active_links); | |
458 | } else { | |
459 | /* otherwise switch directly */ | |
460 | ret = _ieee80211_set_active_links(sdata, active_links); | |
461 | } | |
462 | mutex_unlock(&local->key_mtx); | |
463 | mutex_unlock(&local->mtx); | |
464 | mutex_unlock(&local->sta_mtx); | |
465 | sdata_unlock(sdata); | |
466 | ||
467 | return ret; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(ieee80211_set_active_links); | |
470 | ||
471 | void ieee80211_set_active_links_async(struct ieee80211_vif *vif, | |
472 | u16 active_links) | |
473 | { | |
474 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
475 | ||
476 | if (!ieee80211_sdata_running(sdata)) | |
477 | return; | |
478 | ||
479 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
480 | return; | |
481 | ||
482 | /* cannot activate links that don't exist */ | |
483 | if (active_links & ~sdata->vif.valid_links) | |
484 | return; | |
485 | ||
486 | /* nothing to do */ | |
487 | if (sdata->vif.active_links == active_links) | |
488 | return; | |
489 | ||
490 | sdata->desired_active_links = active_links; | |
491 | schedule_work(&sdata->activate_links_work); | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async); |