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 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
);
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
,
145 u16 valid_links
, u16 dormant_links
)
147 sdata
->vif
.valid_links
= valid_links
;
148 sdata
->vif
.dormant_links
= dormant_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;
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
;
165 /* AP links are not expected to be disabled */
166 WARN_ON(dormant_links
);
168 case NL80211_IFTYPE_STATION
:
169 if (sdata
->vif
.active_links
)
171 sdata
->vif
.active_links
= valid_links
& ~dormant_links
;
172 WARN_ON(hweight16(sdata
->vif
.active_links
) > 1);
179 static int ieee80211_vif_update_links(struct ieee80211_sub_if_data
*sdata
,
180 struct link_container
**to_free
,
181 u16 new_links
, u16 dormant_links
)
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
;
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 */
194 lockdep_assert_wiphy(sdata
->local
->hw
.wiphy
);
196 memset(to_free
, 0, sizeof(links
));
198 if (old_links
== new_links
&& dormant_links
== sdata
->vif
.dormant_links
)
201 /* if there were no old links, need to clear the pointers to deflink */
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
);
212 links
[link_id
] = link
;
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
));
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
) {
226 * we must have allocated the data through this path so
227 * we know we can free both at the same time
229 to_free
[link_id
] = container_of(rcu_access_pointer(sdata
->link
[link_id
]),
230 typeof(*links
[link_id
]),
234 RCU_INIT_POINTER(sdata
->link
[link_id
], NULL
);
235 RCU_INIT_POINTER(sdata
->vif
.link_conf
[link_id
], NULL
);
239 ieee80211_debugfs_recreate_netdev(sdata
, true);
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
);
246 link
= links
[link_id
];
247 ieee80211_link_init(sdata
, link_id
, &link
->data
, &link
->conf
);
248 ieee80211_link_setup(&link
->data
);
252 ieee80211_link_init(sdata
, -1, &sdata
->deflink
,
253 &sdata
->vif
.bss_conf
);
255 ret
= ieee80211_check_dup_link_addrs(sdata
);
257 /* for keys we will not be able to undo this */
258 ieee80211_tear_down_links(sdata
, to_free
, rem
);
260 ieee80211_set_vif_links_bitmaps(sdata
, new_links
, dormant_links
);
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
,
268 ieee80211_debugfs_recreate_netdev(sdata
, false);
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
));
281 /* use deflink/bss_conf again if and only if there are no more links */
282 use_deflink
= new_links
== 0;
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
;
293 ieee80211_link_init(sdata
, -1, &sdata
->deflink
,
294 &sdata
->vif
.bss_conf
);
298 int ieee80211_vif_set_links(struct ieee80211_sub_if_data
*sdata
,
299 u16 new_links
, u16 dormant_links
)
301 struct link_container
*links
[IEEE80211_MLD_MAX_NUM_LINKS
];
304 ret
= ieee80211_vif_update_links(sdata
, links
, new_links
,
306 ieee80211_free_links(sdata
, links
);
311 static int _ieee80211_set_active_links(struct ieee80211_sub_if_data
*sdata
,
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
;
323 if (!ieee80211_sdata_running(sdata
))
326 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
329 if (active_links
& ~ieee80211_vif_usable_links(&sdata
->vif
))
333 if (old_active
== active_links
)
336 for (i
= 0; i
< IEEE80211_MLD_MAX_NUM_LINKS
; i
++)
337 link_confs
[i
] = sdata_dereference(sdata
->vif
.link_conf
[i
],
341 sdata
->vif
.active_links
|= active_links
;
342 ret
= drv_change_vif_links(local
, sdata
,
344 sdata
->vif
.active_links
,
347 sdata
->vif
.active_links
= old_active
;
352 for_each_set_bit(link_id
, &rem
, IEEE80211_MLD_MAX_NUM_LINKS
) {
353 struct ieee80211_link_data
*link
;
355 link
= sdata_dereference(sdata
->link
[link_id
], sdata
);
357 /* FIXME: kill TDLS connections on the link */
359 ieee80211_link_release_channel(link
);
362 list_for_each_entry(sta
, &local
->sta_list
, list
) {
363 if (sdata
!= sta
->sdata
)
366 /* this is very temporary, but do it anyway */
367 __ieee80211_sta_recalc_aggregates(sta
,
368 old_active
| active_links
);
370 ret
= drv_change_sta_links(local
, sdata
, &sta
->sta
,
372 old_active
| active_links
);
376 ret
= ieee80211_key_switch_links(sdata
, rem
, add
);
379 list_for_each_entry(sta
, &local
->sta_list
, list
) {
380 if (sdata
!= sta
->sdata
)
383 __ieee80211_sta_recalc_aggregates(sta
, active_links
);
385 ret
= drv_change_sta_links(local
, sdata
, &sta
->sta
,
386 old_active
| active_links
,
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...
397 __ieee80211_sta_recalc_aggregates(sta
, active_links
);
400 for_each_set_bit(link_id
, &add
, IEEE80211_MLD_MAX_NUM_LINKS
) {
401 struct ieee80211_link_data
*link
;
403 link
= sdata_dereference(sdata
->link
[link_id
], sdata
);
405 ret
= ieee80211_link_use_channel(link
, &link
->conf
->chandef
,
406 IEEE80211_CHANCTX_SHARED
);
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
|
415 BSS_CHANGED_BASIC_RATES
|
419 BSS_CHANGED_TXPOWER
|
420 BSS_CHANGED_BANDWIDTH
|
422 BSS_CHANGED_HE_OBSS_PD
|
423 BSS_CHANGED_HE_BSS_COLOR
);
426 old_active
= sdata
->vif
.active_links
;
427 sdata
->vif
.active_links
= active_links
;
430 ret
= drv_change_vif_links(local
, sdata
, old_active
,
431 active_links
, link_confs
);
438 int ieee80211_set_active_links(struct ieee80211_vif
*vif
, u16 active_links
)
440 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
441 struct ieee80211_local
*local
= sdata
->local
;
445 lockdep_assert_wiphy(local
->hw
.wiphy
);
447 old_active
= sdata
->vif
.active_links
;
448 if (old_active
& active_links
) {
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
454 ret
= _ieee80211_set_active_links(sdata
,
455 old_active
& active_links
);
457 ret
= _ieee80211_set_active_links(sdata
, active_links
);
459 /* otherwise switch directly */
460 ret
= _ieee80211_set_active_links(sdata
, active_links
);
465 EXPORT_SYMBOL_GPL(ieee80211_set_active_links
);
467 void ieee80211_set_active_links_async(struct ieee80211_vif
*vif
,
470 struct ieee80211_sub_if_data
*sdata
= vif_to_sdata(vif
);
472 if (!ieee80211_sdata_running(sdata
))
475 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
478 if (active_links
& ~ieee80211_vif_usable_links(&sdata
->vif
))
482 if (sdata
->vif
.active_links
== active_links
)
485 sdata
->desired_active_links
= active_links
;
486 wiphy_work_queue(sdata
->local
->hw
.wiphy
, &sdata
->activate_links_work
);
488 EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async
);