1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Interface handling
4 *
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2013-2014 Intel Mobile Communications GmbH
10 * Copyright (c) 2016 Intel Deutschland GmbH
11 * Copyright (C) 2018-2023 Intel Corporation
12 */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/kcov.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29
30 /**
31 * DOC: Interface list locking
32 *
33 * The interface list in each struct ieee80211_local is protected
34 * three-fold:
35 *
36 * (1) modifications may only be done under the RTNL
37 * (2) modifications and readers are protected against each other by
38 * the iflist_mtx.
39 * (3) modifications are done in an RCU manner so atomic readers
40 * can traverse the list in RCU-safe blocks.
41 *
42 * As a consequence, reads (traversals) of the list can be protected
43 * by either the RTNL, the iflist_mtx or RCU.
44 */
45
46 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
47
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 struct ieee80211_chanctx_conf *chanctx_conf;
51 int power;
52
53 rcu_read_lock();
54 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
55 if (!chanctx_conf) {
56 rcu_read_unlock();
57 return false;
58 }
59
60 power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 rcu_read_unlock();
62
63 if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 power = min(power, sdata->deflink.user_power_level);
65
66 if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 power = min(power, sdata->deflink.ap_power_level);
68
69 if (power != sdata->vif.bss_conf.txpower) {
70 sdata->vif.bss_conf.txpower = power;
71 ieee80211_hw_config(sdata->local, 0);
72 return true;
73 }
74
75 return false;
76 }
77
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 bool update_bss)
80 {
81 if (__ieee80211_recalc_txpower(sdata) ||
82 (update_bss && ieee80211_sdata_running(sdata)))
83 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
84 BSS_CHANGED_TXPOWER);
85 }
86
__ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 return 0;
91
92 local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 return IEEE80211_CONF_CHANGE_IDLE;
94 }
95
__ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 return 0;
100
101 ieee80211_flush_queues(local, NULL, false);
102
103 local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 return IEEE80211_CONF_CHANGE_IDLE;
105 }
106
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 bool force_active)
109 {
110 bool working, scanning, active;
111 unsigned int led_trig_start = 0, led_trig_stop = 0;
112
113 lockdep_assert_held(&local->mtx);
114
115 active = force_active ||
116 !list_empty(&local->chanctx_list) ||
117 local->monitors;
118
119 working = !local->ops->remain_on_channel &&
120 !list_empty(&local->roc_list);
121
122 scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124
125 if (working || scanning)
126 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 else
128 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129
130 if (active)
131 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 else
133 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134
135 ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136
137 if (working || scanning || active)
138 return __ieee80211_idle_off(local);
139 return __ieee80211_idle_on(local);
140 }
141
ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 return __ieee80211_recalc_idle(local, true);
145 }
146
ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 u32 change = __ieee80211_recalc_idle(local, false);
150 if (change)
151 ieee80211_hw_config(local, change);
152 }
153
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 bool check_dup)
156 {
157 struct ieee80211_local *local = sdata->local;
158 struct ieee80211_sub_if_data *iter;
159 u64 new, mask, tmp;
160 u8 *m;
161 int ret = 0;
162
163 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 return 0;
165
166 m = addr;
167 new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170
171 m = local->hw.wiphy->addr_mask;
172 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175
176 if (!check_dup)
177 return ret;
178
179 mutex_lock(&local->iflist_mtx);
180 list_for_each_entry(iter, &local->interfaces, list) {
181 if (iter == sdata)
182 continue;
183
184 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 continue;
187
188 m = iter->vif.addr;
189 tmp = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192
193 if ((new & ~mask) != (tmp & ~mask)) {
194 ret = -EINVAL;
195 break;
196 }
197 }
198 mutex_unlock(&local->iflist_mtx);
199
200 return ret;
201 }
202
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
204 {
205 struct ieee80211_roc_work *roc;
206 struct ieee80211_local *local = sdata->local;
207 struct ieee80211_sub_if_data *scan_sdata;
208 int ret = 0;
209
210 /* To be the most flexible here we want to only limit changing the
211 * address if the specific interface is doing offchannel work or
212 * scanning.
213 */
214 if (netif_carrier_ok(sdata->dev))
215 return -EBUSY;
216
217 mutex_lock(&local->mtx);
218
219 /* First check no ROC work is happening on this iface */
220 list_for_each_entry(roc, &local->roc_list, list) {
221 if (roc->sdata != sdata)
222 continue;
223
224 if (roc->started) {
225 ret = -EBUSY;
226 goto unlock;
227 }
228 }
229
230 /* And if this iface is scanning */
231 if (local->scanning) {
232 scan_sdata = rcu_dereference_protected(local->scan_sdata,
233 lockdep_is_held(&local->mtx));
234 if (sdata == scan_sdata)
235 ret = -EBUSY;
236 }
237
238 switch (sdata->vif.type) {
239 case NL80211_IFTYPE_STATION:
240 case NL80211_IFTYPE_P2P_CLIENT:
241 /* More interface types could be added here but changing the
242 * address while powered makes the most sense in client modes.
243 */
244 break;
245 default:
246 ret = -EOPNOTSUPP;
247 }
248
249 unlock:
250 mutex_unlock(&local->mtx);
251 return ret;
252 }
253
_ieee80211_change_mac(struct ieee80211_sub_if_data * sdata,void * addr)254 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
255 void *addr)
256 {
257 struct ieee80211_local *local = sdata->local;
258 struct sockaddr *sa = addr;
259 bool check_dup = true;
260 bool live = false;
261 int ret;
262
263 if (ieee80211_sdata_running(sdata)) {
264 ret = ieee80211_can_powered_addr_change(sdata);
265 if (ret)
266 return ret;
267
268 live = true;
269 }
270
271 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
272 !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
273 check_dup = false;
274
275 ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
276 if (ret)
277 return ret;
278
279 if (live)
280 drv_remove_interface(local, sdata);
281 ret = eth_mac_addr(sdata->dev, sa);
282
283 if (ret == 0) {
284 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
285 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
286 }
287
288 /* Regardless of eth_mac_addr() return we still want to add the
289 * interface back. This should not fail...
290 */
291 if (live)
292 WARN_ON(drv_add_interface(local, sdata));
293
294 return ret;
295 }
296
ieee80211_change_mac(struct net_device * dev,void * addr)297 static int ieee80211_change_mac(struct net_device *dev, void *addr)
298 {
299 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
300 struct ieee80211_local *local = sdata->local;
301 int ret;
302
303 /*
304 * This happens during unregistration if there's a bond device
305 * active (maybe other cases?) and we must get removed from it.
306 * But we really don't care anymore if it's not registered now.
307 */
308 if (!dev->ieee80211_ptr->registered)
309 return 0;
310
311 wiphy_lock(local->hw.wiphy);
312 ret = _ieee80211_change_mac(sdata, addr);
313 wiphy_unlock(local->hw.wiphy);
314
315 return ret;
316 }
317
identical_mac_addr_allowed(int type1,int type2)318 static inline int identical_mac_addr_allowed(int type1, int type2)
319 {
320 return type1 == NL80211_IFTYPE_MONITOR ||
321 type2 == NL80211_IFTYPE_MONITOR ||
322 type1 == NL80211_IFTYPE_P2P_DEVICE ||
323 type2 == NL80211_IFTYPE_P2P_DEVICE ||
324 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
325 (type1 == NL80211_IFTYPE_AP_VLAN &&
326 (type2 == NL80211_IFTYPE_AP ||
327 type2 == NL80211_IFTYPE_AP_VLAN));
328 }
329
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)330 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
331 enum nl80211_iftype iftype)
332 {
333 struct ieee80211_local *local = sdata->local;
334 struct ieee80211_sub_if_data *nsdata;
335 int ret;
336
337 ASSERT_RTNL();
338
339 /* we hold the RTNL here so can safely walk the list */
340 list_for_each_entry(nsdata, &local->interfaces, list) {
341 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
342 /*
343 * Only OCB and monitor mode may coexist
344 */
345 if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
346 nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
347 (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
348 nsdata->vif.type == NL80211_IFTYPE_OCB))
349 return -EBUSY;
350
351 /*
352 * Allow only a single IBSS interface to be up at any
353 * time. This is restricted because beacon distribution
354 * cannot work properly if both are in the same IBSS.
355 *
356 * To remove this restriction we'd have to disallow them
357 * from setting the same SSID on different IBSS interfaces
358 * belonging to the same hardware. Then, however, we're
359 * faced with having to adopt two different TSF timers...
360 */
361 if (iftype == NL80211_IFTYPE_ADHOC &&
362 nsdata->vif.type == NL80211_IFTYPE_ADHOC)
363 return -EBUSY;
364 /*
365 * will not add another interface while any channel
366 * switch is active.
367 */
368 if (nsdata->vif.bss_conf.csa_active)
369 return -EBUSY;
370
371 /*
372 * The remaining checks are only performed for interfaces
373 * with the same MAC address.
374 */
375 if (!ether_addr_equal(sdata->vif.addr,
376 nsdata->vif.addr))
377 continue;
378
379 /*
380 * check whether it may have the same address
381 */
382 if (!identical_mac_addr_allowed(iftype,
383 nsdata->vif.type))
384 return -ENOTUNIQ;
385
386 /* No support for VLAN with MLO yet */
387 if (iftype == NL80211_IFTYPE_AP_VLAN &&
388 sdata->wdev.use_4addr &&
389 nsdata->vif.type == NL80211_IFTYPE_AP &&
390 nsdata->vif.valid_links)
391 return -EOPNOTSUPP;
392
393 /*
394 * can only add VLANs to enabled APs
395 */
396 if (iftype == NL80211_IFTYPE_AP_VLAN &&
397 nsdata->vif.type == NL80211_IFTYPE_AP)
398 sdata->bss = &nsdata->u.ap;
399 }
400 }
401
402 mutex_lock(&local->chanctx_mtx);
403 ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
404 mutex_unlock(&local->chanctx_mtx);
405 return ret;
406 }
407
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)408 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
409 enum nl80211_iftype iftype)
410 {
411 int n_queues = sdata->local->hw.queues;
412 int i;
413
414 if (iftype == NL80211_IFTYPE_NAN)
415 return 0;
416
417 if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
418 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
419 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
420 IEEE80211_INVAL_HW_QUEUE))
421 return -EINVAL;
422 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
423 n_queues))
424 return -EINVAL;
425 }
426 }
427
428 if ((iftype != NL80211_IFTYPE_AP &&
429 iftype != NL80211_IFTYPE_P2P_GO &&
430 iftype != NL80211_IFTYPE_MESH_POINT) ||
431 !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
432 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
433 return 0;
434 }
435
436 if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
437 return -EINVAL;
438
439 if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
440 return -EINVAL;
441
442 return 0;
443 }
444
ieee80211_open(struct net_device * dev)445 static int ieee80211_open(struct net_device *dev)
446 {
447 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
448 int err;
449
450 /* fail early if user set an invalid address */
451 if (!is_valid_ether_addr(dev->dev_addr))
452 return -EADDRNOTAVAIL;
453
454 err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
455 if (err)
456 return err;
457
458 wiphy_lock(sdata->local->hw.wiphy);
459 err = ieee80211_do_open(&sdata->wdev, true);
460 wiphy_unlock(sdata->local->hw.wiphy);
461
462 return err;
463 }
464
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)465 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
466 {
467 struct ieee80211_local *local = sdata->local;
468 unsigned long flags;
469 struct sk_buff_head freeq;
470 struct sk_buff *skb, *tmp;
471 u32 hw_reconf_flags = 0;
472 int i, flushed;
473 struct ps_data *ps;
474 struct cfg80211_chan_def chandef;
475 bool cancel_scan;
476 struct cfg80211_nan_func *func;
477
478 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
479 synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
480
481 cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
482 if (cancel_scan)
483 ieee80211_scan_cancel(local);
484
485 ieee80211_roc_purge(local, sdata);
486
487 switch (sdata->vif.type) {
488 case NL80211_IFTYPE_STATION:
489 ieee80211_mgd_stop(sdata);
490 break;
491 case NL80211_IFTYPE_ADHOC:
492 ieee80211_ibss_stop(sdata);
493 break;
494 case NL80211_IFTYPE_MONITOR:
495 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
496 break;
497 list_del_rcu(&sdata->u.mntr.list);
498 break;
499 default:
500 break;
501 }
502
503 /*
504 * Remove all stations associated with this interface.
505 *
506 * This must be done before calling ops->remove_interface()
507 * because otherwise we can later invoke ops->sta_notify()
508 * whenever the STAs are removed, and that invalidates driver
509 * assumptions about always getting a vif pointer that is valid
510 * (because if we remove a STA after ops->remove_interface()
511 * the driver will have removed the vif info already!)
512 *
513 * For AP_VLANs stations may exist since there's nothing else that
514 * would have removed them, but in other modes there shouldn't
515 * be any stations.
516 */
517 flushed = sta_info_flush(sdata);
518 WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
519
520 /* don't count this interface for allmulti while it is down */
521 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
522 atomic_dec(&local->iff_allmultis);
523
524 if (sdata->vif.type == NL80211_IFTYPE_AP) {
525 local->fif_pspoll--;
526 local->fif_probe_req--;
527 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
528 local->fif_probe_req--;
529 }
530
531 if (sdata->dev) {
532 netif_addr_lock_bh(sdata->dev);
533 spin_lock_bh(&local->filter_lock);
534 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
535 sdata->dev->addr_len);
536 spin_unlock_bh(&local->filter_lock);
537 netif_addr_unlock_bh(sdata->dev);
538 }
539
540 del_timer_sync(&local->dynamic_ps_timer);
541 cancel_work_sync(&local->dynamic_ps_enable_work);
542
543 cancel_work_sync(&sdata->recalc_smps);
544
545 sdata_lock(sdata);
546 WARN(ieee80211_vif_is_mld(&sdata->vif),
547 "destroying interface with valid links 0x%04x\n",
548 sdata->vif.valid_links);
549
550 mutex_lock(&local->mtx);
551 sdata->vif.bss_conf.csa_active = false;
552 if (sdata->vif.type == NL80211_IFTYPE_STATION)
553 sdata->deflink.u.mgd.csa_waiting_bcn = false;
554 if (sdata->deflink.csa_block_tx) {
555 ieee80211_wake_vif_queues(local, sdata,
556 IEEE80211_QUEUE_STOP_REASON_CSA);
557 sdata->deflink.csa_block_tx = false;
558 }
559 mutex_unlock(&local->mtx);
560 sdata_unlock(sdata);
561
562 cancel_work_sync(&sdata->deflink.csa_finalize_work);
563 cancel_work_sync(&sdata->deflink.color_change_finalize_work);
564
565 cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
566
567 if (sdata->wdev.cac_started) {
568 chandef = sdata->vif.bss_conf.chandef;
569 WARN_ON(local->suspended);
570 mutex_lock(&local->mtx);
571 ieee80211_link_release_channel(&sdata->deflink);
572 mutex_unlock(&local->mtx);
573 cfg80211_cac_event(sdata->dev, &chandef,
574 NL80211_RADAR_CAC_ABORTED,
575 GFP_KERNEL);
576 }
577
578 if (sdata->vif.type == NL80211_IFTYPE_AP) {
579 WARN_ON(!list_empty(&sdata->u.ap.vlans));
580 } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
581 /* remove all packets in parent bc_buf pointing to this dev */
582 ps = &sdata->bss->ps;
583
584 spin_lock_irqsave(&ps->bc_buf.lock, flags);
585 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
586 if (skb->dev == sdata->dev) {
587 __skb_unlink(skb, &ps->bc_buf);
588 local->total_ps_buffered--;
589 ieee80211_free_txskb(&local->hw, skb);
590 }
591 }
592 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
593 }
594
595 if (going_down)
596 local->open_count--;
597
598 switch (sdata->vif.type) {
599 case NL80211_IFTYPE_AP_VLAN:
600 mutex_lock(&local->mtx);
601 list_del(&sdata->u.vlan.list);
602 mutex_unlock(&local->mtx);
603 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
604 /* see comment in the default case below */
605 ieee80211_free_keys(sdata, true);
606 /* no need to tell driver */
607 break;
608 case NL80211_IFTYPE_MONITOR:
609 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
610 local->cooked_mntrs--;
611 break;
612 }
613
614 local->monitors--;
615 if (local->monitors == 0) {
616 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
617 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
618 }
619
620 ieee80211_adjust_monitor_flags(sdata, -1);
621 break;
622 case NL80211_IFTYPE_NAN:
623 /* clean all the functions */
624 spin_lock_bh(&sdata->u.nan.func_lock);
625
626 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
627 idr_remove(&sdata->u.nan.function_inst_ids, i);
628 cfg80211_free_nan_func(func);
629 }
630 idr_destroy(&sdata->u.nan.function_inst_ids);
631
632 spin_unlock_bh(&sdata->u.nan.func_lock);
633 break;
634 case NL80211_IFTYPE_P2P_DEVICE:
635 /* relies on synchronize_rcu() below */
636 RCU_INIT_POINTER(local->p2p_sdata, NULL);
637 fallthrough;
638 default:
639 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
640 /*
641 * When we get here, the interface is marked down.
642 * Free the remaining keys, if there are any
643 * (which can happen in AP mode if userspace sets
644 * keys before the interface is operating)
645 *
646 * Force the key freeing to always synchronize_net()
647 * to wait for the RX path in case it is using this
648 * interface enqueuing frames at this very time on
649 * another CPU.
650 */
651 ieee80211_free_keys(sdata, true);
652 skb_queue_purge(&sdata->skb_queue);
653 skb_queue_purge(&sdata->status_queue);
654 }
655
656 /*
657 * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
658 * which should be called with interrupts enabled, reclamation
659 * is done in two phases:
660 */
661 __skb_queue_head_init(&freeq);
662
663 /* unlink from local queues... */
664 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
665 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
666 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
667 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
668 if (info->control.vif == &sdata->vif) {
669 __skb_unlink(skb, &local->pending[i]);
670 __skb_queue_tail(&freeq, skb);
671 }
672 }
673 }
674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
675
676 /* ... and perform actual reclamation with interrupts enabled. */
677 skb_queue_walk_safe(&freeq, skb, tmp) {
678 __skb_unlink(skb, &freeq);
679 ieee80211_free_txskb(&local->hw, skb);
680 }
681
682 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
683 ieee80211_txq_remove_vlan(local, sdata);
684
685 if (sdata->vif.txq)
686 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
687
688 sdata->bss = NULL;
689
690 if (local->open_count == 0)
691 ieee80211_clear_tx_pending(local);
692
693 sdata->vif.bss_conf.beacon_int = 0;
694
695 /*
696 * If the interface goes down while suspended, presumably because
697 * the device was unplugged and that happens before our resume,
698 * then the driver is already unconfigured and the remainder of
699 * this function isn't needed.
700 * XXX: what about WoWLAN? If the device has software state, e.g.
701 * memory allocated, it might expect teardown commands from
702 * mac80211 here?
703 */
704 if (local->suspended) {
705 WARN_ON(local->wowlan);
706 WARN_ON(rcu_access_pointer(local->monitor_sdata));
707 return;
708 }
709
710 switch (sdata->vif.type) {
711 case NL80211_IFTYPE_AP_VLAN:
712 break;
713 case NL80211_IFTYPE_MONITOR:
714 if (local->monitors == 0)
715 ieee80211_del_virtual_monitor(local);
716
717 mutex_lock(&local->mtx);
718 ieee80211_recalc_idle(local);
719 mutex_unlock(&local->mtx);
720
721 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
722 break;
723
724 fallthrough;
725 default:
726 if (going_down)
727 drv_remove_interface(local, sdata);
728 }
729
730 ieee80211_recalc_ps(local);
731
732 if (cancel_scan)
733 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
734
735 if (local->open_count == 0) {
736 ieee80211_stop_device(local);
737
738 /* no reconfiguring after stop! */
739 return;
740 }
741
742 /* do after stop to avoid reconfiguring when we stop anyway */
743 ieee80211_configure_filter(local);
744 ieee80211_hw_config(local, hw_reconf_flags);
745
746 if (local->monitors == local->open_count)
747 ieee80211_add_virtual_monitor(local);
748 }
749
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)750 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
751 {
752 struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
753 struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
754
755 if (!tx_vif)
756 return;
757
758 tx_sdata = vif_to_sdata(tx_vif);
759 sdata->vif.mbssid_tx_vif = NULL;
760
761 list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
762 &tx_sdata->local->interfaces, list) {
763 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
764 non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
765 ieee80211_sdata_running(non_tx_sdata)) {
766 non_tx_sdata->vif.mbssid_tx_vif = NULL;
767 dev_close(non_tx_sdata->wdev.netdev);
768 }
769 }
770
771 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
772 tx_sdata->vif.mbssid_tx_vif = NULL;
773 dev_close(tx_sdata->wdev.netdev);
774 }
775 }
776
ieee80211_stop(struct net_device * dev)777 static int ieee80211_stop(struct net_device *dev)
778 {
779 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780
781 /* close dependent VLAN and MBSSID interfaces before locking wiphy */
782 if (sdata->vif.type == NL80211_IFTYPE_AP) {
783 struct ieee80211_sub_if_data *vlan, *tmpsdata;
784
785 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
786 u.vlan.list)
787 dev_close(vlan->dev);
788
789 ieee80211_stop_mbssid(sdata);
790 }
791
792 cancel_work_sync(&sdata->activate_links_work);
793
794 wiphy_lock(sdata->local->hw.wiphy);
795 ieee80211_do_stop(sdata, true);
796 wiphy_unlock(sdata->local->hw.wiphy);
797
798 return 0;
799 }
800
ieee80211_set_multicast_list(struct net_device * dev)801 static void ieee80211_set_multicast_list(struct net_device *dev)
802 {
803 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
804 struct ieee80211_local *local = sdata->local;
805 int allmulti, sdata_allmulti;
806
807 allmulti = !!(dev->flags & IFF_ALLMULTI);
808 sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
809
810 if (allmulti != sdata_allmulti) {
811 if (dev->flags & IFF_ALLMULTI)
812 atomic_inc(&local->iff_allmultis);
813 else
814 atomic_dec(&local->iff_allmultis);
815 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
816 }
817
818 spin_lock_bh(&local->filter_lock);
819 __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
820 spin_unlock_bh(&local->filter_lock);
821 ieee80211_queue_work(&local->hw, &local->reconfig_filter);
822 }
823
824 /*
825 * Called when the netdev is removed or, by the code below, before
826 * the interface type changes.
827 */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)828 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
829 {
830 /* free extra data */
831 ieee80211_free_keys(sdata, false);
832
833 ieee80211_debugfs_remove_netdev(sdata);
834
835 ieee80211_destroy_frag_cache(&sdata->frags);
836
837 if (ieee80211_vif_is_mesh(&sdata->vif))
838 ieee80211_mesh_teardown_sdata(sdata);
839
840 ieee80211_vif_clear_links(sdata);
841 ieee80211_link_stop(&sdata->deflink);
842 }
843
ieee80211_uninit(struct net_device * dev)844 static void ieee80211_uninit(struct net_device *dev)
845 {
846 ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
847 }
848
849 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)850 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
851 {
852 dev_fetch_sw_netstats(stats, dev->tstats);
853 }
854
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)855 static int ieee80211_netdev_setup_tc(struct net_device *dev,
856 enum tc_setup_type type, void *type_data)
857 {
858 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
859 struct ieee80211_local *local = sdata->local;
860
861 return drv_net_setup_tc(local, sdata, dev, type, type_data);
862 }
863
864 static const struct net_device_ops ieee80211_dataif_ops = {
865 .ndo_open = ieee80211_open,
866 .ndo_stop = ieee80211_stop,
867 .ndo_uninit = ieee80211_uninit,
868 .ndo_start_xmit = ieee80211_subif_start_xmit,
869 .ndo_set_rx_mode = ieee80211_set_multicast_list,
870 .ndo_set_mac_address = ieee80211_change_mac,
871 .ndo_get_stats64 = ieee80211_get_stats64,
872 .ndo_setup_tc = ieee80211_netdev_setup_tc,
873 };
874
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)875 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
876 struct sk_buff *skb,
877 struct net_device *sb_dev)
878 {
879 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
880 struct ieee80211_local *local = sdata->local;
881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
882 struct ieee80211_hdr *hdr;
883 int len_rthdr;
884
885 if (local->hw.queues < IEEE80211_NUM_ACS)
886 return 0;
887
888 /* reset flags and info before parsing radiotap header */
889 memset(info, 0, sizeof(*info));
890
891 if (!ieee80211_parse_tx_radiotap(skb, dev))
892 return 0; /* doesn't matter, frame will be dropped */
893
894 len_rthdr = ieee80211_get_radiotap_len(skb->data);
895 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
896 if (skb->len < len_rthdr + 2 ||
897 skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
898 return 0; /* doesn't matter, frame will be dropped */
899
900 return ieee80211_select_queue_80211(sdata, skb, hdr);
901 }
902
903 static const struct net_device_ops ieee80211_monitorif_ops = {
904 .ndo_open = ieee80211_open,
905 .ndo_stop = ieee80211_stop,
906 .ndo_uninit = ieee80211_uninit,
907 .ndo_start_xmit = ieee80211_monitor_start_xmit,
908 .ndo_set_rx_mode = ieee80211_set_multicast_list,
909 .ndo_set_mac_address = ieee80211_change_mac,
910 .ndo_select_queue = ieee80211_monitor_select_queue,
911 .ndo_get_stats64 = ieee80211_get_stats64,
912 };
913
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)914 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
915 struct net_device_path *path)
916 {
917 struct ieee80211_sub_if_data *sdata;
918 struct ieee80211_local *local;
919 struct sta_info *sta;
920 int ret = -ENOENT;
921
922 sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
923 local = sdata->local;
924
925 if (!local->ops->net_fill_forward_path)
926 return -EOPNOTSUPP;
927
928 rcu_read_lock();
929 switch (sdata->vif.type) {
930 case NL80211_IFTYPE_AP_VLAN:
931 sta = rcu_dereference(sdata->u.vlan.sta);
932 if (sta)
933 break;
934 if (sdata->wdev.use_4addr)
935 goto out;
936 if (is_multicast_ether_addr(ctx->daddr))
937 goto out;
938 sta = sta_info_get_bss(sdata, ctx->daddr);
939 break;
940 case NL80211_IFTYPE_AP:
941 if (is_multicast_ether_addr(ctx->daddr))
942 goto out;
943 sta = sta_info_get(sdata, ctx->daddr);
944 break;
945 case NL80211_IFTYPE_STATION:
946 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
947 sta = sta_info_get(sdata, ctx->daddr);
948 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
949 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
950 goto out;
951
952 break;
953 }
954 }
955
956 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
957 break;
958 default:
959 goto out;
960 }
961
962 if (!sta)
963 goto out;
964
965 ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
966 out:
967 rcu_read_unlock();
968
969 return ret;
970 }
971
972 static const struct net_device_ops ieee80211_dataif_8023_ops = {
973 .ndo_open = ieee80211_open,
974 .ndo_stop = ieee80211_stop,
975 .ndo_uninit = ieee80211_uninit,
976 .ndo_start_xmit = ieee80211_subif_start_xmit_8023,
977 .ndo_set_rx_mode = ieee80211_set_multicast_list,
978 .ndo_set_mac_address = ieee80211_change_mac,
979 .ndo_get_stats64 = ieee80211_get_stats64,
980 .ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
981 .ndo_setup_tc = ieee80211_netdev_setup_tc,
982 };
983
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)984 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
985 {
986 switch (iftype) {
987 /* P2P GO and client are mapped to AP/STATION types */
988 case NL80211_IFTYPE_AP:
989 case NL80211_IFTYPE_STATION:
990 return true;
991 default:
992 return false;
993 }
994 }
995
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)996 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
997 {
998 struct ieee80211_local *local = sdata->local;
999 u32 flags;
1000
1001 flags = sdata->vif.offload_flags;
1002
1003 if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
1004 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1005 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
1006
1007 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1008 local->hw.wiphy->frag_threshold != (u32)-1)
1009 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1010
1011 if (local->monitors)
1012 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1013 } else {
1014 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1015 }
1016
1017 if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
1018 ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1019 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
1020
1021 if (local->monitors &&
1022 !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
1023 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1024 } else {
1025 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1026 }
1027
1028 if (sdata->vif.offload_flags == flags)
1029 return false;
1030
1031 sdata->vif.offload_flags = flags;
1032 ieee80211_check_fast_rx_iface(sdata);
1033 return true;
1034 }
1035
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)1036 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1037 {
1038 struct ieee80211_local *local = sdata->local;
1039 struct ieee80211_sub_if_data *bss = sdata;
1040 bool enabled;
1041
1042 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1043 if (!sdata->bss)
1044 return;
1045
1046 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1047 }
1048
1049 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1050 !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1051 return;
1052
1053 enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1054 if (sdata->wdev.use_4addr &&
1055 !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1056 enabled = false;
1057
1058 sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1059 &ieee80211_dataif_ops;
1060 }
1061
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1062 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1063 {
1064 struct ieee80211_local *local = sdata->local;
1065 struct ieee80211_sub_if_data *vsdata;
1066
1067 if (ieee80211_set_sdata_offload_flags(sdata)) {
1068 drv_update_vif_offload(local, sdata);
1069 ieee80211_set_vif_encap_ops(sdata);
1070 }
1071
1072 list_for_each_entry(vsdata, &local->interfaces, list) {
1073 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1074 vsdata->bss != &sdata->u.ap)
1075 continue;
1076
1077 ieee80211_set_vif_encap_ops(vsdata);
1078 }
1079 }
1080
ieee80211_recalc_offload(struct ieee80211_local * local)1081 void ieee80211_recalc_offload(struct ieee80211_local *local)
1082 {
1083 struct ieee80211_sub_if_data *sdata;
1084
1085 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1086 return;
1087
1088 mutex_lock(&local->iflist_mtx);
1089
1090 list_for_each_entry(sdata, &local->interfaces, list) {
1091 if (!ieee80211_sdata_running(sdata))
1092 continue;
1093
1094 ieee80211_recalc_sdata_offload(sdata);
1095 }
1096
1097 mutex_unlock(&local->iflist_mtx);
1098 }
1099
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1100 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1101 const int offset)
1102 {
1103 struct ieee80211_local *local = sdata->local;
1104 u32 flags = sdata->u.mntr.flags;
1105
1106 #define ADJUST(_f, _s) do { \
1107 if (flags & MONITOR_FLAG_##_f) \
1108 local->fif_##_s += offset; \
1109 } while (0)
1110
1111 ADJUST(FCSFAIL, fcsfail);
1112 ADJUST(PLCPFAIL, plcpfail);
1113 ADJUST(CONTROL, control);
1114 ADJUST(CONTROL, pspoll);
1115 ADJUST(OTHER_BSS, other_bss);
1116
1117 #undef ADJUST
1118 }
1119
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1120 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1121 {
1122 struct ieee80211_local *local = sdata->local;
1123 int i;
1124
1125 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1126 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1127 sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1128 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1129 sdata->vif.hw_queue[i] = i;
1130 else
1131 sdata->vif.hw_queue[i] = 0;
1132 }
1133 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1134 }
1135
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1136 static void ieee80211_sdata_init(struct ieee80211_local *local,
1137 struct ieee80211_sub_if_data *sdata)
1138 {
1139 sdata->local = local;
1140
1141 /*
1142 * Initialize the default link, so we can use link_id 0 for non-MLD,
1143 * and that continues to work for non-MLD-aware drivers that use just
1144 * vif.bss_conf instead of vif.link_conf.
1145 *
1146 * Note that we never change this, so if link ID 0 isn't used in an
1147 * MLD connection, we get a separate allocation for it.
1148 */
1149 ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1150 }
1151
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1152 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1153 {
1154 struct ieee80211_sub_if_data *sdata;
1155 int ret;
1156
1157 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1158 return 0;
1159
1160 ASSERT_RTNL();
1161 lockdep_assert_wiphy(local->hw.wiphy);
1162
1163 if (local->monitor_sdata)
1164 return 0;
1165
1166 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1167 if (!sdata)
1168 return -ENOMEM;
1169
1170 /* set up data */
1171 sdata->vif.type = NL80211_IFTYPE_MONITOR;
1172 snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1173 wiphy_name(local->hw.wiphy));
1174 sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1175 mutex_init(&sdata->wdev.mtx);
1176
1177 ieee80211_sdata_init(local, sdata);
1178
1179 ieee80211_set_default_queues(sdata);
1180
1181 ret = drv_add_interface(local, sdata);
1182 if (WARN_ON(ret)) {
1183 /* ok .. stupid driver, it asked for this! */
1184 kfree(sdata);
1185 return ret;
1186 }
1187
1188 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1189
1190 ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1191 if (ret) {
1192 kfree(sdata);
1193 return ret;
1194 }
1195
1196 mutex_lock(&local->iflist_mtx);
1197 rcu_assign_pointer(local->monitor_sdata, sdata);
1198 mutex_unlock(&local->iflist_mtx);
1199
1200 sdata_lock(sdata);
1201 mutex_lock(&local->mtx);
1202 ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1203 IEEE80211_CHANCTX_EXCLUSIVE);
1204 mutex_unlock(&local->mtx);
1205 sdata_unlock(sdata);
1206 if (ret) {
1207 mutex_lock(&local->iflist_mtx);
1208 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1209 mutex_unlock(&local->iflist_mtx);
1210 synchronize_net();
1211 drv_remove_interface(local, sdata);
1212 mutex_destroy(&sdata->wdev.mtx);
1213 kfree(sdata);
1214 return ret;
1215 }
1216
1217 skb_queue_head_init(&sdata->skb_queue);
1218 skb_queue_head_init(&sdata->status_queue);
1219 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1220
1221 return 0;
1222 }
1223
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1224 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1225 {
1226 struct ieee80211_sub_if_data *sdata;
1227
1228 if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1229 return;
1230
1231 ASSERT_RTNL();
1232 lockdep_assert_wiphy(local->hw.wiphy);
1233
1234 mutex_lock(&local->iflist_mtx);
1235
1236 sdata = rcu_dereference_protected(local->monitor_sdata,
1237 lockdep_is_held(&local->iflist_mtx));
1238 if (!sdata) {
1239 mutex_unlock(&local->iflist_mtx);
1240 return;
1241 }
1242
1243 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1244 mutex_unlock(&local->iflist_mtx);
1245
1246 synchronize_net();
1247
1248 sdata_lock(sdata);
1249 mutex_lock(&local->mtx);
1250 ieee80211_link_release_channel(&sdata->deflink);
1251 mutex_unlock(&local->mtx);
1252 sdata_unlock(sdata);
1253
1254 drv_remove_interface(local, sdata);
1255
1256 mutex_destroy(&sdata->wdev.mtx);
1257 kfree(sdata);
1258 }
1259
1260 /*
1261 * NOTE: Be very careful when changing this function, it must NOT return
1262 * an error on interface type changes that have been pre-checked, so most
1263 * checks should be in ieee80211_check_concurrent_iface.
1264 */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1265 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1266 {
1267 struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1268 struct net_device *dev = wdev->netdev;
1269 struct ieee80211_local *local = sdata->local;
1270 u64 changed = 0;
1271 int res;
1272 u32 hw_reconf_flags = 0;
1273
1274 switch (sdata->vif.type) {
1275 case NL80211_IFTYPE_AP_VLAN: {
1276 struct ieee80211_sub_if_data *master;
1277
1278 if (!sdata->bss)
1279 return -ENOLINK;
1280
1281 mutex_lock(&local->mtx);
1282 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1283 mutex_unlock(&local->mtx);
1284
1285 master = container_of(sdata->bss,
1286 struct ieee80211_sub_if_data, u.ap);
1287 sdata->control_port_protocol =
1288 master->control_port_protocol;
1289 sdata->control_port_no_encrypt =
1290 master->control_port_no_encrypt;
1291 sdata->control_port_over_nl80211 =
1292 master->control_port_over_nl80211;
1293 sdata->control_port_no_preauth =
1294 master->control_port_no_preauth;
1295 sdata->vif.cab_queue = master->vif.cab_queue;
1296 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1297 sizeof(sdata->vif.hw_queue));
1298 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1299
1300 mutex_lock(&local->key_mtx);
1301 sdata->crypto_tx_tailroom_needed_cnt +=
1302 master->crypto_tx_tailroom_needed_cnt;
1303 mutex_unlock(&local->key_mtx);
1304
1305 break;
1306 }
1307 case NL80211_IFTYPE_AP:
1308 sdata->bss = &sdata->u.ap;
1309 break;
1310 case NL80211_IFTYPE_MESH_POINT:
1311 case NL80211_IFTYPE_STATION:
1312 case NL80211_IFTYPE_MONITOR:
1313 case NL80211_IFTYPE_ADHOC:
1314 case NL80211_IFTYPE_P2P_DEVICE:
1315 case NL80211_IFTYPE_OCB:
1316 case NL80211_IFTYPE_NAN:
1317 /* no special treatment */
1318 break;
1319 case NL80211_IFTYPE_UNSPECIFIED:
1320 case NUM_NL80211_IFTYPES:
1321 case NL80211_IFTYPE_P2P_CLIENT:
1322 case NL80211_IFTYPE_P2P_GO:
1323 case NL80211_IFTYPE_WDS:
1324 /* cannot happen */
1325 WARN_ON(1);
1326 break;
1327 }
1328
1329 if (local->open_count == 0) {
1330 /* here we can consider everything in good order (again) */
1331 local->reconfig_failure = false;
1332
1333 res = drv_start(local);
1334 if (res)
1335 goto err_del_bss;
1336 /* we're brought up, everything changes */
1337 hw_reconf_flags = ~0;
1338 ieee80211_led_radio(local, true);
1339 ieee80211_mod_tpt_led_trig(local,
1340 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1341 }
1342
1343 /*
1344 * Copy the hopefully now-present MAC address to
1345 * this interface, if it has the special null one.
1346 */
1347 if (dev && is_zero_ether_addr(dev->dev_addr)) {
1348 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1349 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1350
1351 if (!is_valid_ether_addr(dev->dev_addr)) {
1352 res = -EADDRNOTAVAIL;
1353 goto err_stop;
1354 }
1355 }
1356
1357 switch (sdata->vif.type) {
1358 case NL80211_IFTYPE_AP_VLAN:
1359 /* no need to tell driver, but set carrier and chanctx */
1360 if (sdata->bss->active) {
1361 ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1362 netif_carrier_on(dev);
1363 ieee80211_set_vif_encap_ops(sdata);
1364 } else {
1365 netif_carrier_off(dev);
1366 }
1367 break;
1368 case NL80211_IFTYPE_MONITOR:
1369 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1370 local->cooked_mntrs++;
1371 break;
1372 }
1373
1374 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1375 res = drv_add_interface(local, sdata);
1376 if (res)
1377 goto err_stop;
1378 } else if (local->monitors == 0 && local->open_count == 0) {
1379 res = ieee80211_add_virtual_monitor(local);
1380 if (res)
1381 goto err_stop;
1382 }
1383
1384 /* must be before the call to ieee80211_configure_filter */
1385 local->monitors++;
1386 if (local->monitors == 1) {
1387 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1388 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1389 }
1390
1391 ieee80211_adjust_monitor_flags(sdata, 1);
1392 ieee80211_configure_filter(local);
1393 ieee80211_recalc_offload(local);
1394 mutex_lock(&local->mtx);
1395 ieee80211_recalc_idle(local);
1396 mutex_unlock(&local->mtx);
1397
1398 netif_carrier_on(dev);
1399 break;
1400 default:
1401 if (coming_up) {
1402 ieee80211_del_virtual_monitor(local);
1403 ieee80211_set_sdata_offload_flags(sdata);
1404
1405 res = drv_add_interface(local, sdata);
1406 if (res)
1407 goto err_stop;
1408
1409 ieee80211_set_vif_encap_ops(sdata);
1410 res = ieee80211_check_queues(sdata,
1411 ieee80211_vif_type_p2p(&sdata->vif));
1412 if (res)
1413 goto err_del_interface;
1414 }
1415
1416 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1417 local->fif_pspoll++;
1418 local->fif_probe_req++;
1419
1420 ieee80211_configure_filter(local);
1421 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1422 local->fif_probe_req++;
1423 }
1424
1425 if (sdata->vif.probe_req_reg)
1426 drv_config_iface_filter(local, sdata,
1427 FIF_PROBE_REQ,
1428 FIF_PROBE_REQ);
1429
1430 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1431 sdata->vif.type != NL80211_IFTYPE_NAN)
1432 changed |= ieee80211_reset_erp_info(sdata);
1433 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1434 changed);
1435
1436 switch (sdata->vif.type) {
1437 case NL80211_IFTYPE_STATION:
1438 case NL80211_IFTYPE_ADHOC:
1439 case NL80211_IFTYPE_AP:
1440 case NL80211_IFTYPE_MESH_POINT:
1441 case NL80211_IFTYPE_OCB:
1442 netif_carrier_off(dev);
1443 break;
1444 case NL80211_IFTYPE_P2P_DEVICE:
1445 case NL80211_IFTYPE_NAN:
1446 break;
1447 default:
1448 /* not reached */
1449 WARN_ON(1);
1450 }
1451
1452 /*
1453 * Set default queue parameters so drivers don't
1454 * need to initialise the hardware if the hardware
1455 * doesn't start up with sane defaults.
1456 * Enable QoS for anything but station interfaces.
1457 */
1458 ieee80211_set_wmm_default(&sdata->deflink, true,
1459 sdata->vif.type != NL80211_IFTYPE_STATION);
1460 }
1461
1462 switch (sdata->vif.type) {
1463 case NL80211_IFTYPE_P2P_DEVICE:
1464 rcu_assign_pointer(local->p2p_sdata, sdata);
1465 break;
1466 case NL80211_IFTYPE_MONITOR:
1467 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1468 break;
1469 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1470 break;
1471 default:
1472 break;
1473 }
1474
1475 /*
1476 * set_multicast_list will be invoked by the networking core
1477 * which will check whether any increments here were done in
1478 * error and sync them down to the hardware as filter flags.
1479 */
1480 if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1481 atomic_inc(&local->iff_allmultis);
1482
1483 if (coming_up)
1484 local->open_count++;
1485
1486 if (hw_reconf_flags)
1487 ieee80211_hw_config(local, hw_reconf_flags);
1488
1489 ieee80211_recalc_ps(local);
1490
1491 set_bit(SDATA_STATE_RUNNING, &sdata->state);
1492
1493 return 0;
1494 err_del_interface:
1495 drv_remove_interface(local, sdata);
1496 err_stop:
1497 if (!local->open_count)
1498 drv_stop(local);
1499 err_del_bss:
1500 sdata->bss = NULL;
1501 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1502 mutex_lock(&local->mtx);
1503 list_del(&sdata->u.vlan.list);
1504 mutex_unlock(&local->mtx);
1505 }
1506 /* might already be clear but that doesn't matter */
1507 clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1508 return res;
1509 }
1510
ieee80211_if_free(struct net_device * dev)1511 static void ieee80211_if_free(struct net_device *dev)
1512 {
1513 free_percpu(dev->tstats);
1514 }
1515
ieee80211_if_setup(struct net_device * dev)1516 static void ieee80211_if_setup(struct net_device *dev)
1517 {
1518 ether_setup(dev);
1519 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1520 dev->priv_flags |= IFF_NO_QUEUE;
1521 dev->netdev_ops = &ieee80211_dataif_ops;
1522 dev->needs_free_netdev = true;
1523 dev->priv_destructor = ieee80211_if_free;
1524 }
1525
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1526 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1527 struct ieee80211_sub_if_data *sdata,
1528 struct sk_buff *skb)
1529 {
1530 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1531
1532 if (ieee80211_is_action(mgmt->frame_control) &&
1533 mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1534 struct sta_info *sta;
1535 int len = skb->len;
1536
1537 mutex_lock(&local->sta_mtx);
1538 sta = sta_info_get_bss(sdata, mgmt->sa);
1539 if (sta) {
1540 switch (mgmt->u.action.u.addba_req.action_code) {
1541 case WLAN_ACTION_ADDBA_REQ:
1542 ieee80211_process_addba_request(local, sta,
1543 mgmt, len);
1544 break;
1545 case WLAN_ACTION_ADDBA_RESP:
1546 ieee80211_process_addba_resp(local, sta,
1547 mgmt, len);
1548 break;
1549 case WLAN_ACTION_DELBA:
1550 ieee80211_process_delba(sdata, sta,
1551 mgmt, len);
1552 break;
1553 default:
1554 WARN_ON(1);
1555 break;
1556 }
1557 }
1558 mutex_unlock(&local->sta_mtx);
1559 } else if (ieee80211_is_action(mgmt->frame_control) &&
1560 mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1561 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1562 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1563 struct ieee80211_rx_status *status;
1564 enum nl80211_band band;
1565 struct sta_info *sta;
1566 u8 opmode;
1567
1568 status = IEEE80211_SKB_RXCB(skb);
1569 band = status->band;
1570 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1571
1572 mutex_lock(&local->sta_mtx);
1573 sta = sta_info_get_bss(sdata, mgmt->sa);
1574
1575 if (sta)
1576 ieee80211_vht_handle_opmode(sdata,
1577 &sta->deflink,
1578 opmode, band);
1579
1580 mutex_unlock(&local->sta_mtx);
1581 break;
1582 }
1583 case WLAN_VHT_ACTION_GROUPID_MGMT:
1584 ieee80211_process_mu_groups(sdata, &sdata->deflink,
1585 mgmt);
1586 break;
1587 default:
1588 WARN_ON(1);
1589 break;
1590 }
1591 } else if (ieee80211_is_action(mgmt->frame_control) &&
1592 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1593 switch (mgmt->u.action.u.s1g.action_code) {
1594 case WLAN_S1G_TWT_TEARDOWN:
1595 case WLAN_S1G_TWT_SETUP:
1596 ieee80211_s1g_rx_twt_action(sdata, skb);
1597 break;
1598 default:
1599 break;
1600 }
1601 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1602 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1603 ieee80211_sta_rx_queued_ext(sdata, skb);
1604 else
1605 WARN_ON(1);
1606 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1607 struct ieee80211_hdr *hdr = (void *)mgmt;
1608 struct sta_info *sta;
1609
1610 /*
1611 * So the frame isn't mgmt, but frame_control
1612 * is at the right place anyway, of course, so
1613 * the if statement is correct.
1614 *
1615 * Warn if we have other data frame types here,
1616 * they must not get here.
1617 */
1618 WARN_ON(hdr->frame_control &
1619 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1620 WARN_ON(!(hdr->seq_ctrl &
1621 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1622 /*
1623 * This was a fragment of a frame, received while
1624 * a block-ack session was active. That cannot be
1625 * right, so terminate the session.
1626 */
1627 mutex_lock(&local->sta_mtx);
1628 sta = sta_info_get_bss(sdata, mgmt->sa);
1629 if (sta) {
1630 u16 tid = ieee80211_get_tid(hdr);
1631
1632 __ieee80211_stop_rx_ba_session(
1633 sta, tid, WLAN_BACK_RECIPIENT,
1634 WLAN_REASON_QSTA_REQUIRE_SETUP,
1635 true);
1636 }
1637 mutex_unlock(&local->sta_mtx);
1638 } else switch (sdata->vif.type) {
1639 case NL80211_IFTYPE_STATION:
1640 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1641 break;
1642 case NL80211_IFTYPE_ADHOC:
1643 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1644 break;
1645 case NL80211_IFTYPE_MESH_POINT:
1646 if (!ieee80211_vif_is_mesh(&sdata->vif))
1647 break;
1648 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1649 break;
1650 default:
1651 WARN(1, "frame for unexpected interface type");
1652 break;
1653 }
1654 }
1655
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1656 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1657 struct sk_buff *skb)
1658 {
1659 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1660
1661 if (ieee80211_is_action(mgmt->frame_control) &&
1662 mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1663 switch (mgmt->u.action.u.s1g.action_code) {
1664 case WLAN_S1G_TWT_TEARDOWN:
1665 case WLAN_S1G_TWT_SETUP:
1666 ieee80211_s1g_status_twt_action(sdata, skb);
1667 break;
1668 default:
1669 break;
1670 }
1671 }
1672 }
1673
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1674 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1675 {
1676 struct ieee80211_sub_if_data *sdata =
1677 container_of(work, struct ieee80211_sub_if_data, work);
1678 struct ieee80211_local *local = sdata->local;
1679 struct sk_buff *skb;
1680
1681 if (!ieee80211_sdata_running(sdata))
1682 return;
1683
1684 if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1685 return;
1686
1687 if (!ieee80211_can_run_worker(local))
1688 return;
1689
1690 /* first process frames */
1691 while ((skb = skb_dequeue(&sdata->skb_queue))) {
1692 kcov_remote_start_common(skb_get_kcov_handle(skb));
1693
1694 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1695 ieee80211_process_tdls_channel_switch(sdata, skb);
1696 else
1697 ieee80211_iface_process_skb(local, sdata, skb);
1698
1699 kfree_skb(skb);
1700 kcov_remote_stop();
1701 }
1702
1703 /* process status queue */
1704 while ((skb = skb_dequeue(&sdata->status_queue))) {
1705 kcov_remote_start_common(skb_get_kcov_handle(skb));
1706
1707 ieee80211_iface_process_status(sdata, skb);
1708 kfree_skb(skb);
1709
1710 kcov_remote_stop();
1711 }
1712
1713 /* then other type-dependent work */
1714 switch (sdata->vif.type) {
1715 case NL80211_IFTYPE_STATION:
1716 ieee80211_sta_work(sdata);
1717 break;
1718 case NL80211_IFTYPE_ADHOC:
1719 ieee80211_ibss_work(sdata);
1720 break;
1721 case NL80211_IFTYPE_MESH_POINT:
1722 if (!ieee80211_vif_is_mesh(&sdata->vif))
1723 break;
1724 ieee80211_mesh_work(sdata);
1725 break;
1726 case NL80211_IFTYPE_OCB:
1727 ieee80211_ocb_work(sdata);
1728 break;
1729 default:
1730 break;
1731 }
1732 }
1733
ieee80211_recalc_smps_work(struct work_struct * work)1734 static void ieee80211_recalc_smps_work(struct work_struct *work)
1735 {
1736 struct ieee80211_sub_if_data *sdata =
1737 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1738
1739 ieee80211_recalc_smps(sdata, &sdata->deflink);
1740 }
1741
ieee80211_activate_links_work(struct work_struct * work)1742 static void ieee80211_activate_links_work(struct work_struct *work)
1743 {
1744 struct ieee80211_sub_if_data *sdata =
1745 container_of(work, struct ieee80211_sub_if_data,
1746 activate_links_work);
1747
1748 ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1749 }
1750
1751 /*
1752 * Helper function to initialise an interface to a specific type.
1753 */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1754 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1755 enum nl80211_iftype type)
1756 {
1757 static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1758 0xff, 0xff, 0xff};
1759
1760 /* clear type-dependent unions */
1761 memset(&sdata->u, 0, sizeof(sdata->u));
1762 memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1763
1764 /* and set some type-dependent values */
1765 sdata->vif.type = type;
1766 sdata->vif.p2p = false;
1767 sdata->wdev.iftype = type;
1768
1769 sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1770 sdata->control_port_no_encrypt = false;
1771 sdata->control_port_over_nl80211 = false;
1772 sdata->control_port_no_preauth = false;
1773 sdata->vif.cfg.idle = true;
1774 sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1775
1776 sdata->noack_map = 0;
1777
1778 /* only monitor/p2p-device differ */
1779 if (sdata->dev) {
1780 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1781 sdata->dev->type = ARPHRD_ETHER;
1782 }
1783
1784 skb_queue_head_init(&sdata->skb_queue);
1785 skb_queue_head_init(&sdata->status_queue);
1786 wiphy_work_init(&sdata->work, ieee80211_iface_work);
1787 INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1788 INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1789
1790 switch (type) {
1791 case NL80211_IFTYPE_P2P_GO:
1792 type = NL80211_IFTYPE_AP;
1793 sdata->vif.type = type;
1794 sdata->vif.p2p = true;
1795 fallthrough;
1796 case NL80211_IFTYPE_AP:
1797 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1798 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1799 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1800 break;
1801 case NL80211_IFTYPE_P2P_CLIENT:
1802 type = NL80211_IFTYPE_STATION;
1803 sdata->vif.type = type;
1804 sdata->vif.p2p = true;
1805 fallthrough;
1806 case NL80211_IFTYPE_STATION:
1807 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1808 ieee80211_sta_setup_sdata(sdata);
1809 break;
1810 case NL80211_IFTYPE_OCB:
1811 sdata->vif.bss_conf.bssid = bssid_wildcard;
1812 ieee80211_ocb_setup_sdata(sdata);
1813 break;
1814 case NL80211_IFTYPE_ADHOC:
1815 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1816 ieee80211_ibss_setup_sdata(sdata);
1817 break;
1818 case NL80211_IFTYPE_MESH_POINT:
1819 if (ieee80211_vif_is_mesh(&sdata->vif))
1820 ieee80211_mesh_init_sdata(sdata);
1821 break;
1822 case NL80211_IFTYPE_MONITOR:
1823 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1824 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1825 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1826 MONITOR_FLAG_OTHER_BSS;
1827 break;
1828 case NL80211_IFTYPE_NAN:
1829 idr_init(&sdata->u.nan.function_inst_ids);
1830 spin_lock_init(&sdata->u.nan.func_lock);
1831 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1832 break;
1833 case NL80211_IFTYPE_AP_VLAN:
1834 case NL80211_IFTYPE_P2P_DEVICE:
1835 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1836 break;
1837 case NL80211_IFTYPE_UNSPECIFIED:
1838 case NL80211_IFTYPE_WDS:
1839 case NUM_NL80211_IFTYPES:
1840 WARN_ON(1);
1841 break;
1842 }
1843
1844 /* need to do this after the switch so vif.type is correct */
1845 ieee80211_link_setup(&sdata->deflink);
1846
1847 ieee80211_debugfs_add_netdev(sdata);
1848 }
1849
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1850 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1851 enum nl80211_iftype type)
1852 {
1853 struct ieee80211_local *local = sdata->local;
1854 int ret, err;
1855 enum nl80211_iftype internal_type = type;
1856 bool p2p = false;
1857
1858 ASSERT_RTNL();
1859
1860 if (!local->ops->change_interface)
1861 return -EBUSY;
1862
1863 /* for now, don't support changing while links exist */
1864 if (ieee80211_vif_is_mld(&sdata->vif))
1865 return -EBUSY;
1866
1867 switch (sdata->vif.type) {
1868 case NL80211_IFTYPE_AP:
1869 if (!list_empty(&sdata->u.ap.vlans))
1870 return -EBUSY;
1871 break;
1872 case NL80211_IFTYPE_STATION:
1873 case NL80211_IFTYPE_ADHOC:
1874 case NL80211_IFTYPE_OCB:
1875 /*
1876 * Could maybe also all others here?
1877 * Just not sure how that interacts
1878 * with the RX/config path e.g. for
1879 * mesh.
1880 */
1881 break;
1882 default:
1883 return -EBUSY;
1884 }
1885
1886 switch (type) {
1887 case NL80211_IFTYPE_AP:
1888 case NL80211_IFTYPE_STATION:
1889 case NL80211_IFTYPE_ADHOC:
1890 case NL80211_IFTYPE_OCB:
1891 /*
1892 * Could probably support everything
1893 * but here.
1894 */
1895 break;
1896 case NL80211_IFTYPE_P2P_CLIENT:
1897 p2p = true;
1898 internal_type = NL80211_IFTYPE_STATION;
1899 break;
1900 case NL80211_IFTYPE_P2P_GO:
1901 p2p = true;
1902 internal_type = NL80211_IFTYPE_AP;
1903 break;
1904 default:
1905 return -EBUSY;
1906 }
1907
1908 ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1909 if (ret)
1910 return ret;
1911
1912 ieee80211_stop_vif_queues(local, sdata,
1913 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1914 /* do_stop will synchronize_rcu() first thing */
1915 ieee80211_do_stop(sdata, false);
1916
1917 ieee80211_teardown_sdata(sdata);
1918
1919 ieee80211_set_sdata_offload_flags(sdata);
1920 ret = drv_change_interface(local, sdata, internal_type, p2p);
1921 if (ret)
1922 type = ieee80211_vif_type_p2p(&sdata->vif);
1923
1924 /*
1925 * Ignore return value here, there's not much we can do since
1926 * the driver changed the interface type internally already.
1927 * The warnings will hopefully make driver authors fix it :-)
1928 */
1929 ieee80211_check_queues(sdata, type);
1930
1931 ieee80211_setup_sdata(sdata, type);
1932 ieee80211_set_vif_encap_ops(sdata);
1933
1934 err = ieee80211_do_open(&sdata->wdev, false);
1935 WARN(err, "type change: do_open returned %d", err);
1936
1937 ieee80211_wake_vif_queues(local, sdata,
1938 IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1939 return ret;
1940 }
1941
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1942 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1943 enum nl80211_iftype type)
1944 {
1945 int ret;
1946
1947 ASSERT_RTNL();
1948
1949 if (type == ieee80211_vif_type_p2p(&sdata->vif))
1950 return 0;
1951
1952 if (ieee80211_sdata_running(sdata)) {
1953 ret = ieee80211_runtime_change_iftype(sdata, type);
1954 if (ret)
1955 return ret;
1956 } else {
1957 /* Purge and reset type-dependent state. */
1958 ieee80211_teardown_sdata(sdata);
1959 ieee80211_setup_sdata(sdata, type);
1960 }
1961
1962 /* reset some values that shouldn't be kept across type changes */
1963 if (type == NL80211_IFTYPE_STATION)
1964 sdata->u.mgd.use_4addr = false;
1965
1966 return 0;
1967 }
1968
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1969 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1970 u8 *perm_addr, enum nl80211_iftype type)
1971 {
1972 struct ieee80211_sub_if_data *sdata;
1973 u64 mask, start, addr, val, inc;
1974 u8 *m;
1975 u8 tmp_addr[ETH_ALEN];
1976 int i;
1977
1978 /* default ... something at least */
1979 memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1980
1981 if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1982 local->hw.wiphy->n_addresses <= 1)
1983 return;
1984
1985 mutex_lock(&local->iflist_mtx);
1986
1987 switch (type) {
1988 case NL80211_IFTYPE_MONITOR:
1989 /* doesn't matter */
1990 break;
1991 case NL80211_IFTYPE_AP_VLAN:
1992 /* match up with an AP interface */
1993 list_for_each_entry(sdata, &local->interfaces, list) {
1994 if (sdata->vif.type != NL80211_IFTYPE_AP)
1995 continue;
1996 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1997 break;
1998 }
1999 /* keep default if no AP interface present */
2000 break;
2001 case NL80211_IFTYPE_P2P_CLIENT:
2002 case NL80211_IFTYPE_P2P_GO:
2003 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
2004 list_for_each_entry(sdata, &local->interfaces, list) {
2005 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
2006 continue;
2007 if (!ieee80211_sdata_running(sdata))
2008 continue;
2009 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2010 goto out_unlock;
2011 }
2012 }
2013 fallthrough;
2014 default:
2015 /* assign a new address if possible -- try n_addresses first */
2016 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2017 bool used = false;
2018
2019 list_for_each_entry(sdata, &local->interfaces, list) {
2020 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2021 sdata->vif.addr)) {
2022 used = true;
2023 break;
2024 }
2025 }
2026
2027 if (!used) {
2028 memcpy(perm_addr,
2029 local->hw.wiphy->addresses[i].addr,
2030 ETH_ALEN);
2031 break;
2032 }
2033 }
2034
2035 /* try mask if available */
2036 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2037 break;
2038
2039 m = local->hw.wiphy->addr_mask;
2040 mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2041 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2042 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2043
2044 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2045 /* not a contiguous mask ... not handled now! */
2046 pr_info("not contiguous\n");
2047 break;
2048 }
2049
2050 /*
2051 * Pick address of existing interface in case user changed
2052 * MAC address manually, default to perm_addr.
2053 */
2054 m = local->hw.wiphy->perm_addr;
2055 list_for_each_entry(sdata, &local->interfaces, list) {
2056 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2057 continue;
2058 m = sdata->vif.addr;
2059 break;
2060 }
2061 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2062 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2063 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2064
2065 inc = 1ULL<<__ffs64(mask);
2066 val = (start & mask);
2067 addr = (start & ~mask) | (val & mask);
2068 do {
2069 bool used = false;
2070
2071 tmp_addr[5] = addr >> 0*8;
2072 tmp_addr[4] = addr >> 1*8;
2073 tmp_addr[3] = addr >> 2*8;
2074 tmp_addr[2] = addr >> 3*8;
2075 tmp_addr[1] = addr >> 4*8;
2076 tmp_addr[0] = addr >> 5*8;
2077
2078 val += inc;
2079
2080 list_for_each_entry(sdata, &local->interfaces, list) {
2081 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2082 used = true;
2083 break;
2084 }
2085 }
2086
2087 if (!used) {
2088 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2089 break;
2090 }
2091 addr = (start & ~mask) | (val & mask);
2092 } while (addr != start);
2093
2094 break;
2095 }
2096
2097 out_unlock:
2098 mutex_unlock(&local->iflist_mtx);
2099 }
2100
ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)2101 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2102 unsigned char name_assign_type,
2103 struct wireless_dev **new_wdev, enum nl80211_iftype type,
2104 struct vif_params *params)
2105 {
2106 struct net_device *ndev = NULL;
2107 struct ieee80211_sub_if_data *sdata = NULL;
2108 struct txq_info *txqi;
2109 int ret, i;
2110
2111 ASSERT_RTNL();
2112
2113 if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2114 struct wireless_dev *wdev;
2115
2116 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2117 GFP_KERNEL);
2118 if (!sdata)
2119 return -ENOMEM;
2120 wdev = &sdata->wdev;
2121
2122 sdata->dev = NULL;
2123 strscpy(sdata->name, name, IFNAMSIZ);
2124 ieee80211_assign_perm_addr(local, wdev->address, type);
2125 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2126 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2127 } else {
2128 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2129 sizeof(void *));
2130 int txq_size = 0;
2131
2132 if (type != NL80211_IFTYPE_AP_VLAN &&
2133 (type != NL80211_IFTYPE_MONITOR ||
2134 (params->flags & MONITOR_FLAG_ACTIVE)))
2135 txq_size += sizeof(struct txq_info) +
2136 local->hw.txq_data_size;
2137
2138 ndev = alloc_netdev_mqs(size + txq_size,
2139 name, name_assign_type,
2140 ieee80211_if_setup, 1, 1);
2141 if (!ndev)
2142 return -ENOMEM;
2143
2144 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2145
2146 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2147 if (!ndev->tstats) {
2148 free_netdev(ndev);
2149 return -ENOMEM;
2150 }
2151
2152 ndev->needed_headroom = local->tx_headroom +
2153 4*6 /* four MAC addresses */
2154 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2155 + 6 /* mesh */
2156 + 8 /* rfc1042/bridge tunnel */
2157 - ETH_HLEN /* ethernet hard_header_len */
2158 + IEEE80211_ENCRYPT_HEADROOM;
2159 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2160
2161 ret = dev_alloc_name(ndev, ndev->name);
2162 if (ret < 0) {
2163 ieee80211_if_free(ndev);
2164 free_netdev(ndev);
2165 return ret;
2166 }
2167
2168 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2169 if (is_valid_ether_addr(params->macaddr))
2170 eth_hw_addr_set(ndev, params->macaddr);
2171 else
2172 eth_hw_addr_set(ndev, ndev->perm_addr);
2173 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2174
2175 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2176 sdata = netdev_priv(ndev);
2177 ndev->ieee80211_ptr = &sdata->wdev;
2178 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2179 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2180 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2181
2182 if (txq_size) {
2183 txqi = netdev_priv(ndev) + size;
2184 ieee80211_txq_init(sdata, NULL, txqi, 0);
2185 }
2186
2187 sdata->dev = ndev;
2188 }
2189
2190 /* initialise type-independent data */
2191 sdata->wdev.wiphy = local->hw.wiphy;
2192
2193 ieee80211_sdata_init(local, sdata);
2194
2195 ieee80211_init_frag_cache(&sdata->frags);
2196
2197 INIT_LIST_HEAD(&sdata->key_list);
2198
2199 INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2200 ieee80211_delayed_tailroom_dec);
2201
2202 for (i = 0; i < NUM_NL80211_BANDS; i++) {
2203 struct ieee80211_supported_band *sband;
2204 sband = local->hw.wiphy->bands[i];
2205 sdata->rc_rateidx_mask[i] =
2206 sband ? (1 << sband->n_bitrates) - 1 : 0;
2207 if (sband) {
2208 __le16 cap;
2209 u16 *vht_rate_mask;
2210
2211 memcpy(sdata->rc_rateidx_mcs_mask[i],
2212 sband->ht_cap.mcs.rx_mask,
2213 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2214
2215 cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2216 vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2217 ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2218 } else {
2219 memset(sdata->rc_rateidx_mcs_mask[i], 0,
2220 sizeof(sdata->rc_rateidx_mcs_mask[i]));
2221 memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2222 sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2223 }
2224 }
2225
2226 ieee80211_set_default_queues(sdata);
2227
2228 sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2229 sdata->deflink.user_power_level = local->user_power_level;
2230
2231 /* setup type-dependent data */
2232 ieee80211_setup_sdata(sdata, type);
2233
2234 if (ndev) {
2235 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2236 if (type == NL80211_IFTYPE_STATION)
2237 sdata->u.mgd.use_4addr = params->use_4addr;
2238
2239 ndev->features |= local->hw.netdev_features;
2240 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2241 ndev->hw_features |= ndev->features &
2242 MAC80211_SUPPORTED_FEATURES_TX;
2243 sdata->vif.netdev_features = local->hw.netdev_features;
2244
2245 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2246
2247 /* MTU range is normally 256 - 2304, where the upper limit is
2248 * the maximum MSDU size. Monitor interfaces send and receive
2249 * MPDU and A-MSDU frames which may be much larger so we do
2250 * not impose an upper limit in that case.
2251 */
2252 ndev->min_mtu = 256;
2253 if (type == NL80211_IFTYPE_MONITOR)
2254 ndev->max_mtu = 0;
2255 else
2256 ndev->max_mtu = local->hw.max_mtu;
2257
2258 ret = cfg80211_register_netdevice(ndev);
2259 if (ret) {
2260 free_netdev(ndev);
2261 return ret;
2262 }
2263 }
2264
2265 mutex_lock(&local->iflist_mtx);
2266 list_add_tail_rcu(&sdata->list, &local->interfaces);
2267 mutex_unlock(&local->iflist_mtx);
2268
2269 if (new_wdev)
2270 *new_wdev = &sdata->wdev;
2271
2272 return 0;
2273 }
2274
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2275 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2276 {
2277 ASSERT_RTNL();
2278
2279 mutex_lock(&sdata->local->iflist_mtx);
2280 list_del_rcu(&sdata->list);
2281 mutex_unlock(&sdata->local->iflist_mtx);
2282
2283 if (sdata->vif.txq)
2284 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2285
2286 synchronize_rcu();
2287
2288 cfg80211_unregister_wdev(&sdata->wdev);
2289
2290 if (!sdata->dev) {
2291 ieee80211_teardown_sdata(sdata);
2292 kfree(sdata);
2293 }
2294 }
2295
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2296 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2297 {
2298 if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2299 return;
2300 ieee80211_do_stop(sdata, true);
2301 }
2302
ieee80211_remove_interfaces(struct ieee80211_local * local)2303 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2304 {
2305 struct ieee80211_sub_if_data *sdata, *tmp;
2306 LIST_HEAD(unreg_list);
2307
2308 ASSERT_RTNL();
2309
2310 /* Before destroying the interfaces, make sure they're all stopped so
2311 * that the hardware is stopped. Otherwise, the driver might still be
2312 * iterating the interfaces during the shutdown, e.g. from a worker
2313 * or from RX processing or similar, and if it does so (using atomic
2314 * iteration) while we're manipulating the list, the iteration will
2315 * crash.
2316 *
2317 * After this, the hardware should be stopped and the driver should
2318 * have stopped all of its activities, so that we can do RCU-unaware
2319 * manipulations of the interface list below.
2320 */
2321 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2322
2323 WARN(local->open_count, "%s: open count remains %d\n",
2324 wiphy_name(local->hw.wiphy), local->open_count);
2325
2326 ieee80211_txq_teardown_flows(local);
2327
2328 mutex_lock(&local->iflist_mtx);
2329 list_splice_init(&local->interfaces, &unreg_list);
2330 mutex_unlock(&local->iflist_mtx);
2331
2332 wiphy_lock(local->hw.wiphy);
2333 list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2334 bool netdev = sdata->dev;
2335
2336 /*
2337 * Remove IP addresses explicitly, since the notifier will
2338 * skip the callbacks if wdev->registered is false, since
2339 * we can't acquire the wiphy_lock() again there if already
2340 * inside this locked section.
2341 */
2342 sdata_lock(sdata);
2343 sdata->vif.cfg.arp_addr_cnt = 0;
2344 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2345 sdata->u.mgd.associated)
2346 ieee80211_vif_cfg_change_notify(sdata,
2347 BSS_CHANGED_ARP_FILTER);
2348 sdata_unlock(sdata);
2349
2350 list_del(&sdata->list);
2351 cfg80211_unregister_wdev(&sdata->wdev);
2352
2353 if (!netdev)
2354 kfree(sdata);
2355 }
2356 wiphy_unlock(local->hw.wiphy);
2357 }
2358
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2359 static int netdev_notify(struct notifier_block *nb,
2360 unsigned long state, void *ptr)
2361 {
2362 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2363 struct ieee80211_sub_if_data *sdata;
2364
2365 if (state != NETDEV_CHANGENAME)
2366 return NOTIFY_DONE;
2367
2368 if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2369 return NOTIFY_DONE;
2370
2371 if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2372 return NOTIFY_DONE;
2373
2374 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2375 memcpy(sdata->name, dev->name, IFNAMSIZ);
2376 ieee80211_debugfs_rename_netdev(sdata);
2377
2378 return NOTIFY_OK;
2379 }
2380
2381 static struct notifier_block mac80211_netdev_notifier = {
2382 .notifier_call = netdev_notify,
2383 };
2384
ieee80211_iface_init(void)2385 int ieee80211_iface_init(void)
2386 {
2387 return register_netdevice_notifier(&mac80211_netdev_notifier);
2388 }
2389
ieee80211_iface_exit(void)2390 void ieee80211_iface_exit(void)
2391 {
2392 unregister_netdevice_notifier(&mac80211_netdev_notifier);
2393 }
2394
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2395 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2396 {
2397 if (sdata->vif.type == NL80211_IFTYPE_AP)
2398 atomic_inc(&sdata->u.ap.num_mcast_sta);
2399 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2400 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2401 }
2402
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2403 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2404 {
2405 if (sdata->vif.type == NL80211_IFTYPE_AP)
2406 atomic_dec(&sdata->u.ap.num_mcast_sta);
2407 else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2408 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2409 }
2410