1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2022-2023 Intel Corporation
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"
13 #include "debugfs_netdev.h"
15 void ieee80211_link_setup(struct ieee80211_link_data *link)
17 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
18 ieee80211_mgd_setup_link(link);
21 void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
23 struct ieee80211_link_data *link,
24 struct ieee80211_bss_conf *link_conf)
26 bool deflink = link_id < 0;
31 rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
32 rcu_assign_pointer(sdata->link[link_id], link);
35 link->link_id = link_id;
36 link->conf = link_conf;
37 link_conf->link_id = link_id;
38 link_conf->vif = &sdata->vif;
40 INIT_WORK(&link->csa_finalize_work,
41 ieee80211_csa_finalize_work);
42 INIT_WORK(&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 INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
49 ieee80211_dfs_cac_timer_work);
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)));
59 case NL80211_IFTYPE_STATION:
60 /* station sets the bssid in ieee80211_mgd_setup_link */
66 ieee80211_link_debugfs_add(link);
70 void ieee80211_link_stop(struct ieee80211_link_data *link)
72 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
73 ieee80211_mgd_stop_link(link);
75 cancel_delayed_work_sync(&link->color_collision_detect_work);
76 ieee80211_link_release_channel(link);
79 struct link_container {
80 struct ieee80211_link_data data;
81 struct ieee80211_bss_conf conf;
84 static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
85 struct link_container **links, u16 mask)
87 struct ieee80211_link_data *link;
91 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
92 if (!(mask & BIT(link_id)))
94 link = &links[link_id]->data;
95 if (link_id == 0 && !link)
96 link = &sdata->deflink;
99 ieee80211_remove_link_keys(link, &keys);
100 ieee80211_link_debugfs_remove(link);
101 ieee80211_link_stop(link);
106 ieee80211_free_key_list(sdata->local, &keys);
109 static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
110 struct link_container **links)
112 unsigned int link_id;
114 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
115 kfree(links[link_id]);
118 static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
122 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
123 struct ieee80211_link_data *link1;
125 link1 = sdata_dereference(sdata->link[i], sdata);
128 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
129 struct ieee80211_link_data *link2;
131 link2 = sdata_dereference(sdata->link[j], sdata);
135 if (ether_addr_equal(link1->conf->addr,
144 static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
147 sdata->vif.valid_links = links;
150 sdata->vif.active_links = 0;
154 switch (sdata->vif.type) {
155 case NL80211_IFTYPE_AP:
156 /* in an AP all links are always active */
157 sdata->vif.active_links = links;
159 case NL80211_IFTYPE_STATION:
160 if (sdata->vif.active_links)
162 WARN_ON(hweight16(links) > 1);
163 sdata->vif.active_links = links;
170 static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
171 struct link_container **to_free,
174 u16 old_links = sdata->vif.valid_links;
175 u16 old_active = sdata->vif.active_links;
176 unsigned long add = new_links & ~old_links;
177 unsigned long rem = old_links & ~new_links;
178 unsigned int link_id;
180 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
181 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
182 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
183 bool use_deflink = old_links == 0; /* set for error case */
185 sdata_assert_lock(sdata);
187 memset(to_free, 0, sizeof(links));
189 if (old_links == new_links)
192 /* if there were no old links, need to clear the pointers to deflink */
196 /* allocate new link structures first */
197 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
198 link = kzalloc(sizeof(*link), GFP_KERNEL);
203 links[link_id] = link;
206 /* keep track of the old pointers for the driver */
207 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
208 memcpy(old, sdata->vif.link_conf, sizeof(old));
209 /* and for us in error cases */
210 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
211 memcpy(old_data, sdata->link, sizeof(old_data));
213 /* grab old links to free later */
214 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
215 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
217 * we must have allocated the data through this path so
218 * we know we can free both at the same time
220 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
221 typeof(*links[link_id]),
225 RCU_INIT_POINTER(sdata->link[link_id], NULL);
226 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
229 /* link them into data structures */
230 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
231 WARN_ON(!use_deflink &&
232 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
234 link = links[link_id];
235 ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
236 ieee80211_link_setup(&link->data);
240 ieee80211_link_init(sdata, -1, &sdata->deflink,
241 &sdata->vif.bss_conf);
243 ret = ieee80211_check_dup_link_addrs(sdata);
245 /* for keys we will not be able to undo this */
246 ieee80211_tear_down_links(sdata, to_free, rem);
248 ieee80211_set_vif_links_bitmaps(sdata, new_links);
250 /* tell the driver */
251 ret = drv_change_vif_links(sdata->local, sdata,
252 old_links & old_active,
253 new_links & sdata->vif.active_links,
259 memcpy(sdata->link, old_data, sizeof(old_data));
260 memcpy(sdata->vif.link_conf, old, sizeof(old));
261 ieee80211_set_vif_links_bitmaps(sdata, old_links);
262 /* and free (only) the newly allocated links */
263 memset(to_free, 0, sizeof(links));
267 /* use deflink/bss_conf again if and only if there are no more links */
268 use_deflink = new_links == 0;
272 /* if we failed during allocation, only free all */
273 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
274 kfree(links[link_id]);
275 links[link_id] = NULL;
279 ieee80211_link_init(sdata, -1, &sdata->deflink,
280 &sdata->vif.bss_conf);
284 int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
287 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
290 ret = ieee80211_vif_update_links(sdata, links, new_links);
291 ieee80211_free_links(sdata, links);
296 void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
298 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
301 * The locking here is different because when we free links
302 * in the station case we need to be able to cancel_work_sync()
303 * something that also takes the lock.
307 ieee80211_vif_update_links(sdata, links, 0);
310 ieee80211_free_links(sdata, links);
313 static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
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;
325 if (!ieee80211_sdata_running(sdata))
328 if (sdata->vif.type != NL80211_IFTYPE_STATION)
331 /* cannot activate links that don't exist */
332 if (active_links & ~sdata->vif.valid_links)
336 if (old_active == active_links)
339 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
340 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
344 sdata->vif.active_links |= active_links;
345 ret = drv_change_vif_links(local, sdata,
347 sdata->vif.active_links,
350 sdata->vif.active_links = old_active;
355 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
356 struct ieee80211_link_data *link;
358 link = sdata_dereference(sdata->link[link_id], sdata);
360 /* FIXME: kill TDLS connections on the link */
362 ieee80211_link_release_channel(link);
365 list_for_each_entry(sta, &local->sta_list, list) {
366 if (sdata != sta->sdata)
369 /* this is very temporary, but do it anyway */
370 __ieee80211_sta_recalc_aggregates(sta,
371 old_active | active_links);
373 ret = drv_change_sta_links(local, sdata, &sta->sta,
375 old_active | active_links);
379 ret = ieee80211_key_switch_links(sdata, rem, add);
382 list_for_each_entry(sta, &local->sta_list, list) {
383 if (sdata != sta->sdata)
386 __ieee80211_sta_recalc_aggregates(sta, active_links);
388 ret = drv_change_sta_links(local, sdata, &sta->sta,
389 old_active | active_links,
394 * Do it again, just in case - the driver might very
395 * well have called ieee80211_sta_recalc_aggregates()
396 * from there when filling in the new links, which
397 * would set it wrong since the vif's active links are
398 * not switched yet...
400 __ieee80211_sta_recalc_aggregates(sta, active_links);
403 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
404 struct ieee80211_link_data *link;
406 link = sdata_dereference(sdata->link[link_id], sdata);
408 ret = ieee80211_link_use_channel(link, &link->conf->chandef,
409 IEEE80211_CHANCTX_SHARED);
412 ieee80211_mgd_set_link_qos_params(link);
413 ieee80211_link_info_change_notify(sdata, link,
414 BSS_CHANGED_ERP_CTS_PROT |
415 BSS_CHANGED_ERP_PREAMBLE |
416 BSS_CHANGED_ERP_SLOT |
418 BSS_CHANGED_BASIC_RATES |
422 BSS_CHANGED_TXPOWER |
423 BSS_CHANGED_BANDWIDTH |
425 BSS_CHANGED_HE_OBSS_PD |
426 BSS_CHANGED_HE_BSS_COLOR);
429 old_active = sdata->vif.active_links;
430 sdata->vif.active_links = active_links;
433 ret = drv_change_vif_links(local, sdata, old_active,
434 active_links, link_confs);
441 int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
443 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
444 struct ieee80211_local *local = sdata->local;
449 mutex_lock(&local->sta_mtx);
450 mutex_lock(&local->mtx);
451 mutex_lock(&local->key_mtx);
452 old_active = sdata->vif.active_links;
453 if (old_active & active_links) {
455 * if there's at least one link that stays active across
456 * the change then switch to it (to those) first, and
457 * then enable the additional links
459 ret = _ieee80211_set_active_links(sdata,
460 old_active & active_links);
462 ret = _ieee80211_set_active_links(sdata, active_links);
464 /* otherwise switch directly */
465 ret = _ieee80211_set_active_links(sdata, active_links);
467 mutex_unlock(&local->key_mtx);
468 mutex_unlock(&local->mtx);
469 mutex_unlock(&local->sta_mtx);
474 EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
476 void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
479 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
481 if (!ieee80211_sdata_running(sdata))
484 if (sdata->vif.type != NL80211_IFTYPE_STATION)
487 /* cannot activate links that don't exist */
488 if (active_links & ~sdata->vif.valid_links)
492 if (sdata->vif.active_links == active_links)
495 sdata->desired_active_links = active_links;
496 schedule_work(&sdata->activate_links_work);
498 EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);