1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 2022 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"
14 void ieee80211_link_setup(struct ieee80211_link_data *link)
16 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
17 ieee80211_mgd_setup_link(link);
20 void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
22 struct ieee80211_link_data *link,
23 struct ieee80211_bss_conf *link_conf)
25 bool deflink = link_id < 0;
30 rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
31 rcu_assign_pointer(sdata->link[link_id], link);
34 link->link_id = link_id;
35 link->conf = link_conf;
36 link_conf->link_id = link_id;
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);
42 INIT_LIST_HEAD(&link->assigned_chanctx_list);
43 INIT_LIST_HEAD(&link->reserved_chanctx_list);
44 INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
45 ieee80211_dfs_cac_timer_work);
48 switch (sdata->vif.type) {
49 case NL80211_IFTYPE_AP:
50 ether_addr_copy(link_conf->addr,
51 sdata->wdev.links[link_id].addr);
52 link_conf->bssid = link_conf->addr;
53 WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
55 case NL80211_IFTYPE_STATION:
56 /* station sets the bssid in ieee80211_mgd_setup_link */
64 void ieee80211_link_stop(struct ieee80211_link_data *link)
66 if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
67 ieee80211_mgd_stop_link(link);
69 ieee80211_link_release_channel(link);
72 struct link_container {
73 struct ieee80211_link_data data;
74 struct ieee80211_bss_conf conf;
77 static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
78 struct link_container **links, u16 mask)
80 struct ieee80211_link_data *link;
84 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
85 if (!(mask & BIT(link_id)))
87 link = &links[link_id]->data;
88 if (link_id == 0 && !link)
89 link = &sdata->deflink;
92 ieee80211_remove_link_keys(link, &keys);
93 ieee80211_link_stop(link);
98 ieee80211_free_key_list(sdata->local, &keys);
101 static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
102 struct link_container **links)
104 unsigned int link_id;
106 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
107 kfree(links[link_id]);
110 static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
114 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
115 struct ieee80211_link_data *link1;
117 link1 = sdata_dereference(sdata->link[i], sdata);
120 for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
121 struct ieee80211_link_data *link2;
123 link2 = sdata_dereference(sdata->link[j], sdata);
127 if (ether_addr_equal(link1->conf->addr,
136 static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
139 sdata->vif.valid_links = links;
142 sdata->vif.active_links = 0;
146 switch (sdata->vif.type) {
147 case NL80211_IFTYPE_AP:
148 /* in an AP all links are always active */
149 sdata->vif.active_links = links;
151 case NL80211_IFTYPE_STATION:
152 if (sdata->vif.active_links)
154 WARN_ON(hweight16(links) > 1);
155 sdata->vif.active_links = links;
162 static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
163 struct link_container **to_free,
166 u16 old_links = sdata->vif.valid_links;
167 u16 old_active = sdata->vif.active_links;
168 unsigned long add = new_links & ~old_links;
169 unsigned long rem = old_links & ~new_links;
170 unsigned int link_id;
172 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
173 struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
174 struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
175 bool use_deflink = old_links == 0; /* set for error case */
177 sdata_assert_lock(sdata);
179 memset(to_free, 0, sizeof(links));
181 if (old_links == new_links)
184 /* if there were no old links, need to clear the pointers to deflink */
188 /* allocate new link structures first */
189 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
190 link = kzalloc(sizeof(*link), GFP_KERNEL);
195 links[link_id] = link;
198 /* keep track of the old pointers for the driver */
199 BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
200 memcpy(old, sdata->vif.link_conf, sizeof(old));
201 /* and for us in error cases */
202 BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
203 memcpy(old_data, sdata->link, sizeof(old_data));
205 /* grab old links to free later */
206 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
207 if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
209 * we must have allocated the data through this path so
210 * we know we can free both at the same time
212 to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
213 typeof(*links[link_id]),
217 RCU_INIT_POINTER(sdata->link[link_id], NULL);
218 RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
221 /* link them into data structures */
222 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
223 WARN_ON(!use_deflink &&
224 rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
226 link = links[link_id];
227 ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
228 ieee80211_link_setup(&link->data);
232 ieee80211_link_init(sdata, -1, &sdata->deflink,
233 &sdata->vif.bss_conf);
235 ret = ieee80211_check_dup_link_addrs(sdata);
237 /* for keys we will not be able to undo this */
238 ieee80211_tear_down_links(sdata, to_free, rem);
240 ieee80211_set_vif_links_bitmaps(sdata, new_links);
242 /* tell the driver */
243 ret = drv_change_vif_links(sdata->local, sdata,
244 old_links & old_active,
245 new_links & sdata->vif.active_links,
251 memcpy(sdata->link, old_data, sizeof(old_data));
252 memcpy(sdata->vif.link_conf, old, sizeof(old));
253 ieee80211_set_vif_links_bitmaps(sdata, old_links);
254 /* and free (only) the newly allocated links */
255 memset(to_free, 0, sizeof(links));
259 /* use deflink/bss_conf again if and only if there are no more links */
260 use_deflink = new_links == 0;
264 /* if we failed during allocation, only free all */
265 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
266 kfree(links[link_id]);
267 links[link_id] = NULL;
271 ieee80211_link_init(sdata, -1, &sdata->deflink,
272 &sdata->vif.bss_conf);
276 int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
279 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
282 ret = ieee80211_vif_update_links(sdata, links, new_links);
283 ieee80211_free_links(sdata, links);
288 void ieee80211_vif_clear_links(struct ieee80211_sub_if_data *sdata)
290 struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
293 * The locking here is different because when we free links
294 * in the station case we need to be able to cancel_work_sync()
295 * something that also takes the lock.
299 ieee80211_vif_update_links(sdata, links, 0);
302 ieee80211_free_links(sdata, links);
305 static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
308 struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
309 struct ieee80211_local *local = sdata->local;
310 u16 old_active = sdata->vif.active_links;
311 unsigned long rem = old_active & ~active_links;
312 unsigned long add = active_links & ~old_active;
313 struct sta_info *sta;
314 unsigned int link_id;
317 if (!ieee80211_sdata_running(sdata))
320 if (sdata->vif.type != NL80211_IFTYPE_STATION)
323 /* cannot activate links that don't exist */
324 if (active_links & ~sdata->vif.valid_links)
328 if (old_active == active_links)
331 for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
332 link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
336 sdata->vif.active_links |= active_links;
337 ret = drv_change_vif_links(local, sdata,
339 sdata->vif.active_links,
342 sdata->vif.active_links = old_active;
347 for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
348 struct ieee80211_link_data *link;
350 link = sdata_dereference(sdata->link[link_id], sdata);
352 /* FIXME: kill TDLS connections on the link */
354 ieee80211_link_release_channel(link);
357 list_for_each_entry(sta, &local->sta_list, list) {
358 if (sdata != sta->sdata)
360 ret = drv_change_sta_links(local, sdata, &sta->sta,
362 old_active | active_links);
366 ret = ieee80211_key_switch_links(sdata, rem, add);
369 list_for_each_entry(sta, &local->sta_list, list) {
370 if (sdata != sta->sdata)
372 ret = drv_change_sta_links(local, sdata, &sta->sta,
373 old_active | active_links,
378 for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
379 struct ieee80211_link_data *link;
381 link = sdata_dereference(sdata->link[link_id], sdata);
383 ret = ieee80211_link_use_channel(link, &link->conf->chandef,
384 IEEE80211_CHANCTX_SHARED);
387 ieee80211_link_info_change_notify(sdata, link,
388 BSS_CHANGED_ERP_CTS_PROT |
389 BSS_CHANGED_ERP_PREAMBLE |
390 BSS_CHANGED_ERP_SLOT |
392 BSS_CHANGED_BASIC_RATES |
396 BSS_CHANGED_TXPOWER |
397 BSS_CHANGED_BANDWIDTH |
399 BSS_CHANGED_HE_OBSS_PD |
400 BSS_CHANGED_HE_BSS_COLOR);
401 ieee80211_mgd_set_link_qos_params(link);
404 old_active = sdata->vif.active_links;
405 sdata->vif.active_links = active_links;
408 ret = drv_change_vif_links(local, sdata, old_active,
409 active_links, link_confs);
416 int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
418 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
419 struct ieee80211_local *local = sdata->local;
424 mutex_lock(&local->sta_mtx);
425 mutex_lock(&local->mtx);
426 mutex_lock(&local->key_mtx);
427 old_active = sdata->vif.active_links;
428 if (old_active & active_links) {
430 * if there's at least one link that stays active across
431 * the change then switch to it (to those) first, and
432 * then enable the additional links
434 ret = _ieee80211_set_active_links(sdata,
435 old_active & active_links);
437 ret = _ieee80211_set_active_links(sdata, active_links);
439 /* otherwise switch directly */
440 ret = _ieee80211_set_active_links(sdata, active_links);
442 mutex_unlock(&local->key_mtx);
443 mutex_unlock(&local->mtx);
444 mutex_unlock(&local->sta_mtx);
449 EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
451 void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
454 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
456 if (!ieee80211_sdata_running(sdata))
459 if (sdata->vif.type != NL80211_IFTYPE_STATION)
462 /* cannot activate links that don't exist */
463 if (active_links & ~sdata->vif.valid_links)
467 if (sdata->vif.active_links == active_links)
470 sdata->desired_active_links = active_links;
471 schedule_work(&sdata->activate_links_work);
473 EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);