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e73b5e51 JB |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * MLO link handling | |
4 | * | |
b82730bf | 5 | * Copyright (C) 2022-2024 Intel Corporation |
e73b5e51 JB |
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" |
170cd6a6 | 13 | #include "debugfs_netdev.h" |
e73b5e51 JB |
14 | |
15 | void 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 | ||
21 | void 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; | |
e1f113cc | 38 | link_conf->vif = &sdata->vif; |
e73b5e51 | 39 | |
d7074be6 JB |
40 | wiphy_work_init(&link->csa_finalize_work, |
41 | ieee80211_csa_finalize_work); | |
b38579ae JB |
42 | wiphy_work_init(&link->color_change_finalize_work, |
43 | ieee80211_color_change_finalize_work); | |
92881884 LB |
44 | INIT_DELAYED_WORK(&link->color_collision_detect_work, |
45 | ieee80211_color_collision_detection_work); | |
e73b5e51 JB |
46 | INIT_LIST_HEAD(&link->assigned_chanctx_list); |
47 | INIT_LIST_HEAD(&link->reserved_chanctx_list); | |
766d2601 JB |
48 | wiphy_delayed_work_init(&link->dfs_cac_timer_work, |
49 | ieee80211_dfs_cac_timer_work); | |
e73b5e51 JB |
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 | } | |
170cd6a6 BB |
65 | |
66 | ieee80211_link_debugfs_add(link); | |
e73b5e51 JB |
67 | } |
68 | } | |
69 | ||
70 | void 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 | ||
92881884 | 75 | cancel_delayed_work_sync(&link->color_collision_detect_work); |
1a96bb4e AKS |
76 | wiphy_work_cancel(link->sdata->local->hw.wiphy, |
77 | &link->csa_finalize_work); | |
e73b5e51 JB |
78 | ieee80211_link_release_channel(link); |
79 | } | |
80 | ||
81 | struct link_container { | |
82 | struct ieee80211_link_data data; | |
83 | struct ieee80211_bss_conf conf; | |
84 | }; | |
85 | ||
efe9c2bf JB |
86 | static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata, |
87 | struct link_container **links, u16 mask) | |
e73b5e51 | 88 | { |
efe9c2bf | 89 | struct ieee80211_link_data *link; |
e73b5e51 JB |
90 | LIST_HEAD(keys); |
91 | unsigned int link_id; | |
92 | ||
93 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { | |
efe9c2bf JB |
94 | if (!(mask & BIT(link_id))) |
95 | continue; | |
96 | link = &links[link_id]->data; | |
97 | if (link_id == 0 && !link) | |
98 | link = &sdata->deflink; | |
99 | if (WARN_ON(!link)) | |
e73b5e51 | 100 | continue; |
efe9c2bf | 101 | ieee80211_remove_link_keys(link, &keys); |
170cd6a6 | 102 | ieee80211_link_debugfs_remove(link); |
efe9c2bf | 103 | ieee80211_link_stop(link); |
e73b5e51 JB |
104 | } |
105 | ||
106 | synchronize_rcu(); | |
107 | ||
108 | ieee80211_free_key_list(sdata->local, &keys); | |
efe9c2bf | 109 | } |
e73b5e51 | 110 | |
efe9c2bf JB |
111 | static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata, |
112 | struct link_container **links) | |
113 | { | |
114 | unsigned int link_id; | |
115 | ||
116 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) | |
e73b5e51 | 117 | kfree(links[link_id]); |
e73b5e51 JB |
118 | } |
119 | ||
120 | static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata) | |
121 | { | |
122 | unsigned int i, j; | |
123 | ||
124 | for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) { | |
125 | struct ieee80211_link_data *link1; | |
126 | ||
127 | link1 = sdata_dereference(sdata->link[i], sdata); | |
128 | if (!link1) | |
129 | continue; | |
130 | for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) { | |
131 | struct ieee80211_link_data *link2; | |
132 | ||
133 | link2 = sdata_dereference(sdata->link[j], sdata); | |
134 | if (!link2) | |
135 | continue; | |
136 | ||
137 | if (ether_addr_equal(link1->conf->addr, | |
138 | link2->conf->addr)) | |
139 | return -EALREADY; | |
140 | } | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
efe9c2bf | 146 | static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata, |
6d543b34 | 147 | u16 valid_links, u16 dormant_links) |
efe9c2bf | 148 | { |
6d543b34 IP |
149 | sdata->vif.valid_links = valid_links; |
150 | sdata->vif.dormant_links = dormant_links; | |
151 | ||
152 | if (!valid_links || | |
153 | WARN((~valid_links & dormant_links) || | |
154 | !(valid_links & ~dormant_links), | |
155 | "Invalid links: valid=0x%x, dormant=0x%x", | |
156 | valid_links, dormant_links)) { | |
efe9c2bf | 157 | sdata->vif.active_links = 0; |
6d543b34 | 158 | sdata->vif.dormant_links = 0; |
efe9c2bf JB |
159 | return; |
160 | } | |
161 | ||
162 | switch (sdata->vif.type) { | |
163 | case NL80211_IFTYPE_AP: | |
164 | /* in an AP all links are always active */ | |
6d543b34 IP |
165 | sdata->vif.active_links = valid_links; |
166 | ||
167 | /* AP links are not expected to be disabled */ | |
168 | WARN_ON(dormant_links); | |
efe9c2bf JB |
169 | break; |
170 | case NL80211_IFTYPE_STATION: | |
171 | if (sdata->vif.active_links) | |
172 | break; | |
6d543b34 IP |
173 | sdata->vif.active_links = valid_links & ~dormant_links; |
174 | WARN_ON(hweight16(sdata->vif.active_links) > 1); | |
efe9c2bf JB |
175 | break; |
176 | default: | |
177 | WARN_ON(1); | |
178 | } | |
179 | } | |
180 | ||
e73b5e51 JB |
181 | static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata, |
182 | struct link_container **to_free, | |
6d543b34 | 183 | u16 new_links, u16 dormant_links) |
e73b5e51 JB |
184 | { |
185 | u16 old_links = sdata->vif.valid_links; | |
efe9c2bf | 186 | u16 old_active = sdata->vif.active_links; |
e73b5e51 JB |
187 | unsigned long add = new_links & ~old_links; |
188 | unsigned long rem = old_links & ~new_links; | |
189 | unsigned int link_id; | |
190 | int ret; | |
191 | struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link; | |
192 | struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS]; | |
193 | struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS]; | |
194 | bool use_deflink = old_links == 0; /* set for error case */ | |
195 | ||
076fc877 | 196 | lockdep_assert_wiphy(sdata->local->hw.wiphy); |
e73b5e51 JB |
197 | |
198 | memset(to_free, 0, sizeof(links)); | |
199 | ||
e7182c4e | 200 | if (old_links == new_links && dormant_links == sdata->vif.dormant_links) |
e73b5e51 JB |
201 | return 0; |
202 | ||
203 | /* if there were no old links, need to clear the pointers to deflink */ | |
204 | if (!old_links) | |
205 | rem |= BIT(0); | |
206 | ||
207 | /* allocate new link structures first */ | |
208 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
209 | link = kzalloc(sizeof(*link), GFP_KERNEL); | |
210 | if (!link) { | |
211 | ret = -ENOMEM; | |
212 | goto free; | |
213 | } | |
214 | links[link_id] = link; | |
215 | } | |
216 | ||
217 | /* keep track of the old pointers for the driver */ | |
218 | BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf)); | |
219 | memcpy(old, sdata->vif.link_conf, sizeof(old)); | |
220 | /* and for us in error cases */ | |
221 | BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link)); | |
222 | memcpy(old_data, sdata->link, sizeof(old_data)); | |
223 | ||
224 | /* grab old links to free later */ | |
225 | for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { | |
226 | if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) { | |
227 | /* | |
228 | * we must have allocated the data through this path so | |
229 | * we know we can free both at the same time | |
230 | */ | |
231 | to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]), | |
232 | typeof(*links[link_id]), | |
233 | data); | |
234 | } | |
235 | ||
236 | RCU_INIT_POINTER(sdata->link[link_id], NULL); | |
237 | RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL); | |
238 | } | |
239 | ||
c942398f MK |
240 | if (!old_links) |
241 | ieee80211_debugfs_recreate_netdev(sdata, true); | |
242 | ||
e73b5e51 JB |
243 | /* link them into data structures */ |
244 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
245 | WARN_ON(!use_deflink && | |
246 | rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink); | |
247 | ||
248 | link = links[link_id]; | |
249 | ieee80211_link_init(sdata, link_id, &link->data, &link->conf); | |
250 | ieee80211_link_setup(&link->data); | |
251 | } | |
252 | ||
253 | if (new_links == 0) | |
254 | ieee80211_link_init(sdata, -1, &sdata->deflink, | |
255 | &sdata->vif.bss_conf); | |
256 | ||
e73b5e51 JB |
257 | ret = ieee80211_check_dup_link_addrs(sdata); |
258 | if (!ret) { | |
efe9c2bf JB |
259 | /* for keys we will not be able to undo this */ |
260 | ieee80211_tear_down_links(sdata, to_free, rem); | |
261 | ||
6d543b34 | 262 | ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links); |
efe9c2bf | 263 | |
e73b5e51 JB |
264 | /* tell the driver */ |
265 | ret = drv_change_vif_links(sdata->local, sdata, | |
efe9c2bf JB |
266 | old_links & old_active, |
267 | new_links & sdata->vif.active_links, | |
e73b5e51 | 268 | old); |
c942398f MK |
269 | if (!new_links) |
270 | ieee80211_debugfs_recreate_netdev(sdata, false); | |
e73b5e51 JB |
271 | } |
272 | ||
273 | if (ret) { | |
274 | /* restore config */ | |
275 | memcpy(sdata->link, old_data, sizeof(old_data)); | |
276 | memcpy(sdata->vif.link_conf, old, sizeof(old)); | |
6d543b34 | 277 | ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links); |
e73b5e51 JB |
278 | /* and free (only) the newly allocated links */ |
279 | memset(to_free, 0, sizeof(links)); | |
280 | goto free; | |
281 | } | |
282 | ||
283 | /* use deflink/bss_conf again if and only if there are no more links */ | |
284 | use_deflink = new_links == 0; | |
285 | ||
286 | goto deinit; | |
287 | free: | |
288 | /* if we failed during allocation, only free all */ | |
289 | for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) { | |
290 | kfree(links[link_id]); | |
291 | links[link_id] = NULL; | |
292 | } | |
293 | deinit: | |
294 | if (use_deflink) | |
295 | ieee80211_link_init(sdata, -1, &sdata->deflink, | |
296 | &sdata->vif.bss_conf); | |
297 | return ret; | |
298 | } | |
299 | ||
300 | int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata, | |
6d543b34 | 301 | u16 new_links, u16 dormant_links) |
e73b5e51 JB |
302 | { |
303 | struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS]; | |
304 | int ret; | |
305 | ||
6d543b34 IP |
306 | ret = ieee80211_vif_update_links(sdata, links, new_links, |
307 | dormant_links); | |
e73b5e51 JB |
308 | ieee80211_free_links(sdata, links); |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
3d901102 JB |
313 | static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata, |
314 | u16 active_links) | |
315 | { | |
316 | struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS]; | |
317 | struct ieee80211_local *local = sdata->local; | |
318 | u16 old_active = sdata->vif.active_links; | |
319 | unsigned long rem = old_active & ~active_links; | |
320 | unsigned long add = active_links & ~old_active; | |
321 | struct sta_info *sta; | |
322 | unsigned int link_id; | |
323 | int ret, i; | |
324 | ||
325 | if (!ieee80211_sdata_running(sdata)) | |
326 | return -ENETDOWN; | |
327 | ||
328 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
329 | return -EINVAL; | |
330 | ||
f1871abd | 331 | if (active_links & ~ieee80211_vif_usable_links(&sdata->vif)) |
3d901102 JB |
332 | return -EINVAL; |
333 | ||
334 | /* nothing to do */ | |
335 | if (old_active == active_links) | |
336 | return 0; | |
337 | ||
338 | for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) | |
339 | link_confs[i] = sdata_dereference(sdata->vif.link_conf[i], | |
340 | sdata); | |
341 | ||
342 | if (add) { | |
343 | sdata->vif.active_links |= active_links; | |
344 | ret = drv_change_vif_links(local, sdata, | |
345 | old_active, | |
346 | sdata->vif.active_links, | |
347 | link_confs); | |
348 | if (ret) { | |
349 | sdata->vif.active_links = old_active; | |
350 | return ret; | |
351 | } | |
352 | } | |
353 | ||
354 | for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) { | |
355 | struct ieee80211_link_data *link; | |
356 | ||
357 | link = sdata_dereference(sdata->link[link_id], sdata); | |
358 | ||
07fba227 | 359 | ieee80211_teardown_tdls_peers(link); |
3d901102 | 360 | |
3c9ff1a1 | 361 | __ieee80211_link_release_channel(link, true); |
3d901102 JB |
362 | } |
363 | ||
364 | list_for_each_entry(sta, &local->sta_list, list) { | |
365 | if (sdata != sta->sdata) | |
366 | continue; | |
9b41a9d7 JB |
367 | |
368 | /* this is very temporary, but do it anyway */ | |
369 | __ieee80211_sta_recalc_aggregates(sta, | |
370 | old_active | active_links); | |
371 | ||
3d901102 JB |
372 | ret = drv_change_sta_links(local, sdata, &sta->sta, |
373 | old_active, | |
374 | old_active | active_links); | |
375 | WARN_ON_ONCE(ret); | |
376 | } | |
377 | ||
378 | ret = ieee80211_key_switch_links(sdata, rem, add); | |
379 | WARN_ON_ONCE(ret); | |
380 | ||
381 | list_for_each_entry(sta, &local->sta_list, list) { | |
382 | if (sdata != sta->sdata) | |
383 | continue; | |
9b41a9d7 JB |
384 | |
385 | __ieee80211_sta_recalc_aggregates(sta, active_links); | |
386 | ||
3d901102 JB |
387 | ret = drv_change_sta_links(local, sdata, &sta->sta, |
388 | old_active | active_links, | |
389 | active_links); | |
390 | WARN_ON_ONCE(ret); | |
9b41a9d7 JB |
391 | |
392 | /* | |
393 | * Do it again, just in case - the driver might very | |
394 | * well have called ieee80211_sta_recalc_aggregates() | |
395 | * from there when filling in the new links, which | |
396 | * would set it wrong since the vif's active links are | |
397 | * not switched yet... | |
398 | */ | |
399 | __ieee80211_sta_recalc_aggregates(sta, active_links); | |
3d901102 JB |
400 | } |
401 | ||
402 | for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) { | |
403 | struct ieee80211_link_data *link; | |
404 | ||
405 | link = sdata_dereference(sdata->link[link_id], sdata); | |
406 | ||
cc3ea42c BB |
407 | /* |
408 | * This call really should not fail. Unfortunately, it appears | |
409 | * that this may happen occasionally with some drivers. Should | |
410 | * it happen, we are stuck in a bad place as going backwards is | |
411 | * not really feasible. | |
412 | * | |
413 | * So lets just tell link_use_channel that it must not fail to | |
414 | * assign the channel context (from mac80211's perspective) and | |
415 | * assume the driver is going to trigger a recovery flow if it | |
416 | * had a failure. | |
417 | * That really is not great nor guaranteed to work. But at least | |
418 | * the internal mac80211 state remains consistent and there is | |
419 | * a chance that we can recover. | |
420 | */ | |
421 | ret = _ieee80211_link_use_channel(link, | |
422 | &link->conf->chanreq, | |
423 | IEEE80211_CHANCTX_SHARED, | |
424 | true); | |
3d901102 JB |
425 | WARN_ON_ONCE(ret); |
426 | ||
01605ad6 | 427 | ieee80211_mgd_set_link_qos_params(link); |
3d901102 JB |
428 | ieee80211_link_info_change_notify(sdata, link, |
429 | BSS_CHANGED_ERP_CTS_PROT | | |
430 | BSS_CHANGED_ERP_PREAMBLE | | |
431 | BSS_CHANGED_ERP_SLOT | | |
432 | BSS_CHANGED_HT | | |
433 | BSS_CHANGED_BASIC_RATES | | |
434 | BSS_CHANGED_BSSID | | |
435 | BSS_CHANGED_CQM | | |
436 | BSS_CHANGED_QOS | | |
437 | BSS_CHANGED_TXPOWER | | |
438 | BSS_CHANGED_BANDWIDTH | | |
439 | BSS_CHANGED_TWT | | |
440 | BSS_CHANGED_HE_OBSS_PD | | |
441 | BSS_CHANGED_HE_BSS_COLOR); | |
3d901102 JB |
442 | } |
443 | ||
444 | old_active = sdata->vif.active_links; | |
445 | sdata->vif.active_links = active_links; | |
446 | ||
447 | if (rem) { | |
448 | ret = drv_change_vif_links(local, sdata, old_active, | |
449 | active_links, link_confs); | |
450 | WARN_ON_ONCE(ret); | |
451 | } | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
076fc877 | 456 | int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links) |
3d901102 JB |
457 | { |
458 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
459 | struct ieee80211_local *local = sdata->local; | |
460 | u16 old_active; | |
461 | int ret; | |
462 | ||
4d3acf43 | 463 | lockdep_assert_wiphy(local->hw.wiphy); |
2a8b665e | 464 | |
b341590e MK |
465 | if (WARN_ON(!active_links)) |
466 | return -EINVAL; | |
467 | ||
2f51c87a JB |
468 | old_active = sdata->vif.active_links; |
469 | if (old_active == active_links) | |
470 | return 0; | |
471 | ||
e993af2e MK |
472 | if (!drv_can_activate_links(local, sdata, active_links)) |
473 | return -EINVAL; | |
474 | ||
3d901102 JB |
475 | if (old_active & active_links) { |
476 | /* | |
477 | * if there's at least one link that stays active across | |
478 | * the change then switch to it (to those) first, and | |
479 | * then enable the additional links | |
480 | */ | |
481 | ret = _ieee80211_set_active_links(sdata, | |
482 | old_active & active_links); | |
483 | if (!ret) | |
484 | ret = _ieee80211_set_active_links(sdata, active_links); | |
485 | } else { | |
486 | /* otherwise switch directly */ | |
487 | ret = _ieee80211_set_active_links(sdata, active_links); | |
488 | } | |
79973d5c BB |
489 | |
490 | return ret; | |
491 | } | |
3d901102 JB |
492 | EXPORT_SYMBOL_GPL(ieee80211_set_active_links); |
493 | ||
494 | void ieee80211_set_active_links_async(struct ieee80211_vif *vif, | |
495 | u16 active_links) | |
496 | { | |
497 | struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); | |
498 | ||
b341590e MK |
499 | if (WARN_ON(!active_links)) |
500 | return; | |
501 | ||
3d901102 JB |
502 | if (!ieee80211_sdata_running(sdata)) |
503 | return; | |
504 | ||
505 | if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
506 | return; | |
507 | ||
f1871abd | 508 | if (active_links & ~ieee80211_vif_usable_links(&sdata->vif)) |
3d901102 JB |
509 | return; |
510 | ||
511 | /* nothing to do */ | |
512 | if (sdata->vif.active_links == active_links) | |
513 | return; | |
514 | ||
515 | sdata->desired_active_links = active_links; | |
7206a948 | 516 | wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work); |
3d901102 JB |
517 | } |
518 | EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async); |