xref: /openbmc/linux/net/mac80211/iface.c (revision b2abe33d)
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) 2018-2022 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 work_struct *work);
47 
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 
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 
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 
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 
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 
142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 	return __ieee80211_recalc_idle(local, true);
145 }
146 
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 
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 
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 		return -EOPNOTSUPP;
247 	}
248 
249 unlock:
250 	mutex_unlock(&local->mtx);
251 	return ret;
252 }
253 
254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
255 {
256 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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(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 
297 static inline int identical_mac_addr_allowed(int type1, int type2)
298 {
299 	return type1 == NL80211_IFTYPE_MONITOR ||
300 		type2 == NL80211_IFTYPE_MONITOR ||
301 		type1 == NL80211_IFTYPE_P2P_DEVICE ||
302 		type2 == NL80211_IFTYPE_P2P_DEVICE ||
303 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
304 		(type1 == NL80211_IFTYPE_AP_VLAN &&
305 			(type2 == NL80211_IFTYPE_AP ||
306 			 type2 == NL80211_IFTYPE_AP_VLAN));
307 }
308 
309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
310 					    enum nl80211_iftype iftype)
311 {
312 	struct ieee80211_local *local = sdata->local;
313 	struct ieee80211_sub_if_data *nsdata;
314 	int ret;
315 
316 	ASSERT_RTNL();
317 
318 	/* we hold the RTNL here so can safely walk the list */
319 	list_for_each_entry(nsdata, &local->interfaces, list) {
320 		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
321 			/*
322 			 * Only OCB and monitor mode may coexist
323 			 */
324 			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
325 			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
326 			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
327 			     nsdata->vif.type == NL80211_IFTYPE_OCB))
328 				return -EBUSY;
329 
330 			/*
331 			 * Allow only a single IBSS interface to be up at any
332 			 * time. This is restricted because beacon distribution
333 			 * cannot work properly if both are in the same IBSS.
334 			 *
335 			 * To remove this restriction we'd have to disallow them
336 			 * from setting the same SSID on different IBSS interfaces
337 			 * belonging to the same hardware. Then, however, we're
338 			 * faced with having to adopt two different TSF timers...
339 			 */
340 			if (iftype == NL80211_IFTYPE_ADHOC &&
341 			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
342 				return -EBUSY;
343 			/*
344 			 * will not add another interface while any channel
345 			 * switch is active.
346 			 */
347 			if (nsdata->vif.bss_conf.csa_active)
348 				return -EBUSY;
349 
350 			/*
351 			 * The remaining checks are only performed for interfaces
352 			 * with the same MAC address.
353 			 */
354 			if (!ether_addr_equal(sdata->vif.addr,
355 					      nsdata->vif.addr))
356 				continue;
357 
358 			/*
359 			 * check whether it may have the same address
360 			 */
361 			if (!identical_mac_addr_allowed(iftype,
362 							nsdata->vif.type))
363 				return -ENOTUNIQ;
364 
365 			/* No support for VLAN with MLO yet */
366 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
367 			    nsdata->wdev.use_4addr)
368 				return -EOPNOTSUPP;
369 
370 			/*
371 			 * can only add VLANs to enabled APs
372 			 */
373 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
374 			    nsdata->vif.type == NL80211_IFTYPE_AP)
375 				sdata->bss = &nsdata->u.ap;
376 		}
377 	}
378 
379 	mutex_lock(&local->chanctx_mtx);
380 	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
381 	mutex_unlock(&local->chanctx_mtx);
382 	return ret;
383 }
384 
385 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
386 				  enum nl80211_iftype iftype)
387 {
388 	int n_queues = sdata->local->hw.queues;
389 	int i;
390 
391 	if (iftype == NL80211_IFTYPE_NAN)
392 		return 0;
393 
394 	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
395 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
396 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
397 					 IEEE80211_INVAL_HW_QUEUE))
398 				return -EINVAL;
399 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
400 					 n_queues))
401 				return -EINVAL;
402 		}
403 	}
404 
405 	if ((iftype != NL80211_IFTYPE_AP &&
406 	     iftype != NL80211_IFTYPE_P2P_GO &&
407 	     iftype != NL80211_IFTYPE_MESH_POINT) ||
408 	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
409 		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
410 		return 0;
411 	}
412 
413 	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
414 		return -EINVAL;
415 
416 	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
417 		return -EINVAL;
418 
419 	return 0;
420 }
421 
422 static int ieee80211_open(struct net_device *dev)
423 {
424 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
425 	int err;
426 
427 	/* fail early if user set an invalid address */
428 	if (!is_valid_ether_addr(dev->dev_addr))
429 		return -EADDRNOTAVAIL;
430 
431 	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
432 	if (err)
433 		return err;
434 
435 	wiphy_lock(sdata->local->hw.wiphy);
436 	err = ieee80211_do_open(&sdata->wdev, true);
437 	wiphy_unlock(sdata->local->hw.wiphy);
438 
439 	return err;
440 }
441 
442 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
443 {
444 	struct ieee80211_local *local = sdata->local;
445 	unsigned long flags;
446 	struct sk_buff *skb, *tmp;
447 	u32 hw_reconf_flags = 0;
448 	int i, flushed;
449 	struct ps_data *ps;
450 	struct cfg80211_chan_def chandef;
451 	bool cancel_scan;
452 	struct cfg80211_nan_func *func;
453 
454 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
455 	synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
456 
457 	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
458 	if (cancel_scan)
459 		ieee80211_scan_cancel(local);
460 
461 	/*
462 	 * Stop TX on this interface first.
463 	 */
464 	if (sdata->dev)
465 		netif_tx_stop_all_queues(sdata->dev);
466 
467 	ieee80211_roc_purge(local, sdata);
468 
469 	switch (sdata->vif.type) {
470 	case NL80211_IFTYPE_STATION:
471 		ieee80211_mgd_stop(sdata);
472 		break;
473 	case NL80211_IFTYPE_ADHOC:
474 		ieee80211_ibss_stop(sdata);
475 		break;
476 	case NL80211_IFTYPE_MONITOR:
477 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
478 			break;
479 		list_del_rcu(&sdata->u.mntr.list);
480 		break;
481 	default:
482 		break;
483 	}
484 
485 	/*
486 	 * Remove all stations associated with this interface.
487 	 *
488 	 * This must be done before calling ops->remove_interface()
489 	 * because otherwise we can later invoke ops->sta_notify()
490 	 * whenever the STAs are removed, and that invalidates driver
491 	 * assumptions about always getting a vif pointer that is valid
492 	 * (because if we remove a STA after ops->remove_interface()
493 	 * the driver will have removed the vif info already!)
494 	 *
495 	 * For AP_VLANs stations may exist since there's nothing else that
496 	 * would have removed them, but in other modes there shouldn't
497 	 * be any stations.
498 	 */
499 	flushed = sta_info_flush(sdata);
500 	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
501 
502 	/* don't count this interface for allmulti while it is down */
503 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
504 		atomic_dec(&local->iff_allmultis);
505 
506 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
507 		local->fif_pspoll--;
508 		local->fif_probe_req--;
509 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
510 		local->fif_probe_req--;
511 	}
512 
513 	if (sdata->dev) {
514 		netif_addr_lock_bh(sdata->dev);
515 		spin_lock_bh(&local->filter_lock);
516 		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
517 				 sdata->dev->addr_len);
518 		spin_unlock_bh(&local->filter_lock);
519 		netif_addr_unlock_bh(sdata->dev);
520 	}
521 
522 	del_timer_sync(&local->dynamic_ps_timer);
523 	cancel_work_sync(&local->dynamic_ps_enable_work);
524 
525 	cancel_work_sync(&sdata->recalc_smps);
526 
527 	sdata_lock(sdata);
528 	WARN(sdata->vif.valid_links,
529 	     "destroying interface with valid links 0x%04x\n",
530 	     sdata->vif.valid_links);
531 
532 	mutex_lock(&local->mtx);
533 	sdata->vif.bss_conf.csa_active = false;
534 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
535 		sdata->deflink.u.mgd.csa_waiting_bcn = false;
536 	if (sdata->deflink.csa_block_tx) {
537 		ieee80211_wake_vif_queues(local, sdata,
538 					  IEEE80211_QUEUE_STOP_REASON_CSA);
539 		sdata->deflink.csa_block_tx = false;
540 	}
541 	mutex_unlock(&local->mtx);
542 	sdata_unlock(sdata);
543 
544 	cancel_work_sync(&sdata->deflink.csa_finalize_work);
545 	cancel_work_sync(&sdata->deflink.color_change_finalize_work);
546 
547 	cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
548 
549 	if (sdata->wdev.cac_started) {
550 		chandef = sdata->vif.bss_conf.chandef;
551 		WARN_ON(local->suspended);
552 		mutex_lock(&local->mtx);
553 		ieee80211_link_release_channel(&sdata->deflink);
554 		mutex_unlock(&local->mtx);
555 		cfg80211_cac_event(sdata->dev, &chandef,
556 				   NL80211_RADAR_CAC_ABORTED,
557 				   GFP_KERNEL);
558 	}
559 
560 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
561 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
562 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
563 		/* remove all packets in parent bc_buf pointing to this dev */
564 		ps = &sdata->bss->ps;
565 
566 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
567 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
568 			if (skb->dev == sdata->dev) {
569 				__skb_unlink(skb, &ps->bc_buf);
570 				local->total_ps_buffered--;
571 				ieee80211_free_txskb(&local->hw, skb);
572 			}
573 		}
574 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
575 	}
576 
577 	if (going_down)
578 		local->open_count--;
579 
580 	switch (sdata->vif.type) {
581 	case NL80211_IFTYPE_AP_VLAN:
582 		mutex_lock(&local->mtx);
583 		list_del(&sdata->u.vlan.list);
584 		mutex_unlock(&local->mtx);
585 		RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
586 		/* see comment in the default case below */
587 		ieee80211_free_keys(sdata, true);
588 		/* no need to tell driver */
589 		break;
590 	case NL80211_IFTYPE_MONITOR:
591 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
592 			local->cooked_mntrs--;
593 			break;
594 		}
595 
596 		local->monitors--;
597 		if (local->monitors == 0) {
598 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
599 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
600 		}
601 
602 		ieee80211_adjust_monitor_flags(sdata, -1);
603 		break;
604 	case NL80211_IFTYPE_NAN:
605 		/* clean all the functions */
606 		spin_lock_bh(&sdata->u.nan.func_lock);
607 
608 		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
609 			idr_remove(&sdata->u.nan.function_inst_ids, i);
610 			cfg80211_free_nan_func(func);
611 		}
612 		idr_destroy(&sdata->u.nan.function_inst_ids);
613 
614 		spin_unlock_bh(&sdata->u.nan.func_lock);
615 		break;
616 	case NL80211_IFTYPE_P2P_DEVICE:
617 		/* relies on synchronize_rcu() below */
618 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
619 		fallthrough;
620 	default:
621 		cancel_work_sync(&sdata->work);
622 		/*
623 		 * When we get here, the interface is marked down.
624 		 * Free the remaining keys, if there are any
625 		 * (which can happen in AP mode if userspace sets
626 		 * keys before the interface is operating)
627 		 *
628 		 * Force the key freeing to always synchronize_net()
629 		 * to wait for the RX path in case it is using this
630 		 * interface enqueuing frames at this very time on
631 		 * another CPU.
632 		 */
633 		ieee80211_free_keys(sdata, true);
634 		skb_queue_purge(&sdata->skb_queue);
635 		skb_queue_purge(&sdata->status_queue);
636 	}
637 
638 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
639 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
640 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
641 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
642 			if (info->control.vif == &sdata->vif) {
643 				__skb_unlink(skb, &local->pending[i]);
644 				ieee80211_free_txskb(&local->hw, skb);
645 			}
646 		}
647 	}
648 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
649 
650 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
651 		ieee80211_txq_remove_vlan(local, sdata);
652 
653 	sdata->bss = NULL;
654 
655 	if (local->open_count == 0)
656 		ieee80211_clear_tx_pending(local);
657 
658 	sdata->vif.bss_conf.beacon_int = 0;
659 
660 	/*
661 	 * If the interface goes down while suspended, presumably because
662 	 * the device was unplugged and that happens before our resume,
663 	 * then the driver is already unconfigured and the remainder of
664 	 * this function isn't needed.
665 	 * XXX: what about WoWLAN? If the device has software state, e.g.
666 	 *	memory allocated, it might expect teardown commands from
667 	 *	mac80211 here?
668 	 */
669 	if (local->suspended) {
670 		WARN_ON(local->wowlan);
671 		WARN_ON(rcu_access_pointer(local->monitor_sdata));
672 		return;
673 	}
674 
675 	switch (sdata->vif.type) {
676 	case NL80211_IFTYPE_AP_VLAN:
677 		break;
678 	case NL80211_IFTYPE_MONITOR:
679 		if (local->monitors == 0)
680 			ieee80211_del_virtual_monitor(local);
681 
682 		mutex_lock(&local->mtx);
683 		ieee80211_recalc_idle(local);
684 		mutex_unlock(&local->mtx);
685 
686 		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
687 			break;
688 
689 		fallthrough;
690 	default:
691 		if (going_down)
692 			drv_remove_interface(local, sdata);
693 	}
694 
695 	ieee80211_recalc_ps(local);
696 
697 	if (cancel_scan)
698 		flush_delayed_work(&local->scan_work);
699 
700 	if (local->open_count == 0) {
701 		ieee80211_stop_device(local);
702 
703 		/* no reconfiguring after stop! */
704 		return;
705 	}
706 
707 	/* do after stop to avoid reconfiguring when we stop anyway */
708 	ieee80211_configure_filter(local);
709 	ieee80211_hw_config(local, hw_reconf_flags);
710 
711 	if (local->monitors == local->open_count)
712 		ieee80211_add_virtual_monitor(local);
713 }
714 
715 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
716 {
717 	struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
718 	struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
719 
720 	if (!tx_vif)
721 		return;
722 
723 	tx_sdata = vif_to_sdata(tx_vif);
724 	sdata->vif.mbssid_tx_vif = NULL;
725 
726 	list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
727 				 &tx_sdata->local->interfaces, list) {
728 		if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
729 		    non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
730 		    ieee80211_sdata_running(non_tx_sdata)) {
731 			non_tx_sdata->vif.mbssid_tx_vif = NULL;
732 			dev_close(non_tx_sdata->wdev.netdev);
733 		}
734 	}
735 
736 	if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
737 		tx_sdata->vif.mbssid_tx_vif = NULL;
738 		dev_close(tx_sdata->wdev.netdev);
739 	}
740 }
741 
742 static int ieee80211_stop(struct net_device *dev)
743 {
744 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
745 
746 	/* close dependent VLAN and MBSSID interfaces before locking wiphy */
747 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
748 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
749 
750 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
751 					 u.vlan.list)
752 			dev_close(vlan->dev);
753 
754 		ieee80211_stop_mbssid(sdata);
755 	}
756 
757 	wiphy_lock(sdata->local->hw.wiphy);
758 	ieee80211_do_stop(sdata, true);
759 	wiphy_unlock(sdata->local->hw.wiphy);
760 
761 	return 0;
762 }
763 
764 static void ieee80211_set_multicast_list(struct net_device *dev)
765 {
766 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
767 	struct ieee80211_local *local = sdata->local;
768 	int allmulti, sdata_allmulti;
769 
770 	allmulti = !!(dev->flags & IFF_ALLMULTI);
771 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
772 
773 	if (allmulti != sdata_allmulti) {
774 		if (dev->flags & IFF_ALLMULTI)
775 			atomic_inc(&local->iff_allmultis);
776 		else
777 			atomic_dec(&local->iff_allmultis);
778 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
779 	}
780 
781 	spin_lock_bh(&local->filter_lock);
782 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
783 	spin_unlock_bh(&local->filter_lock);
784 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
785 }
786 
787 /*
788  * Called when the netdev is removed or, by the code below, before
789  * the interface type changes.
790  */
791 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
792 {
793 	/* free extra data */
794 	ieee80211_free_keys(sdata, false);
795 
796 	ieee80211_debugfs_remove_netdev(sdata);
797 
798 	ieee80211_destroy_frag_cache(&sdata->frags);
799 
800 	if (ieee80211_vif_is_mesh(&sdata->vif))
801 		ieee80211_mesh_teardown_sdata(sdata);
802 
803 	ieee80211_vif_clear_links(sdata);
804 	ieee80211_link_stop(&sdata->deflink);
805 }
806 
807 static void ieee80211_uninit(struct net_device *dev)
808 {
809 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
810 }
811 
812 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
813 					 struct sk_buff *skb,
814 					 struct net_device *sb_dev)
815 {
816 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
817 }
818 
819 static void
820 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
821 {
822 	dev_fetch_sw_netstats(stats, dev->tstats);
823 }
824 
825 static const struct net_device_ops ieee80211_dataif_ops = {
826 	.ndo_open		= ieee80211_open,
827 	.ndo_stop		= ieee80211_stop,
828 	.ndo_uninit		= ieee80211_uninit,
829 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
830 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
831 	.ndo_set_mac_address 	= ieee80211_change_mac,
832 	.ndo_select_queue	= ieee80211_netdev_select_queue,
833 	.ndo_get_stats64	= ieee80211_get_stats64,
834 };
835 
836 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
837 					  struct sk_buff *skb,
838 					  struct net_device *sb_dev)
839 {
840 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
841 	struct ieee80211_local *local = sdata->local;
842 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
843 	struct ieee80211_hdr *hdr;
844 	int len_rthdr;
845 
846 	if (local->hw.queues < IEEE80211_NUM_ACS)
847 		return 0;
848 
849 	/* reset flags and info before parsing radiotap header */
850 	memset(info, 0, sizeof(*info));
851 
852 	if (!ieee80211_parse_tx_radiotap(skb, dev))
853 		return 0; /* doesn't matter, frame will be dropped */
854 
855 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
856 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
857 	if (skb->len < len_rthdr + 2 ||
858 	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
859 		return 0; /* doesn't matter, frame will be dropped */
860 
861 	return ieee80211_select_queue_80211(sdata, skb, hdr);
862 }
863 
864 static const struct net_device_ops ieee80211_monitorif_ops = {
865 	.ndo_open		= ieee80211_open,
866 	.ndo_stop		= ieee80211_stop,
867 	.ndo_uninit		= ieee80211_uninit,
868 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
869 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
870 	.ndo_set_mac_address 	= ieee80211_change_mac,
871 	.ndo_select_queue	= ieee80211_monitor_select_queue,
872 	.ndo_get_stats64	= ieee80211_get_stats64,
873 };
874 
875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
876 					      struct net_device_path *path)
877 {
878 	struct ieee80211_sub_if_data *sdata;
879 	struct ieee80211_local *local;
880 	struct sta_info *sta;
881 	int ret = -ENOENT;
882 
883 	sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
884 	local = sdata->local;
885 
886 	if (!local->ops->net_fill_forward_path)
887 		return -EOPNOTSUPP;
888 
889 	rcu_read_lock();
890 	switch (sdata->vif.type) {
891 	case NL80211_IFTYPE_AP_VLAN:
892 		sta = rcu_dereference(sdata->u.vlan.sta);
893 		if (sta)
894 			break;
895 		if (sdata->wdev.use_4addr)
896 			goto out;
897 		if (is_multicast_ether_addr(ctx->daddr))
898 			goto out;
899 		sta = sta_info_get_bss(sdata, ctx->daddr);
900 		break;
901 	case NL80211_IFTYPE_AP:
902 		if (is_multicast_ether_addr(ctx->daddr))
903 			goto out;
904 		sta = sta_info_get(sdata, ctx->daddr);
905 		break;
906 	case NL80211_IFTYPE_STATION:
907 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
908 			sta = sta_info_get(sdata, ctx->daddr);
909 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
910 				if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
911 					goto out;
912 
913 				break;
914 			}
915 		}
916 
917 		sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
918 		break;
919 	default:
920 		goto out;
921 	}
922 
923 	if (!sta)
924 		goto out;
925 
926 	ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
927 out:
928 	rcu_read_unlock();
929 
930 	return ret;
931 }
932 
933 static const struct net_device_ops ieee80211_dataif_8023_ops = {
934 	.ndo_open		= ieee80211_open,
935 	.ndo_stop		= ieee80211_stop,
936 	.ndo_uninit		= ieee80211_uninit,
937 	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
938 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
939 	.ndo_set_mac_address	= ieee80211_change_mac,
940 	.ndo_select_queue	= ieee80211_netdev_select_queue,
941 	.ndo_get_stats64	= ieee80211_get_stats64,
942 	.ndo_fill_forward_path	= ieee80211_netdev_fill_forward_path,
943 };
944 
945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
946 {
947 	switch (iftype) {
948 	/* P2P GO and client are mapped to AP/STATION types */
949 	case NL80211_IFTYPE_AP:
950 	case NL80211_IFTYPE_STATION:
951 		return true;
952 	default:
953 		return false;
954 	}
955 }
956 
957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
958 {
959 	struct ieee80211_local *local = sdata->local;
960 	u32 flags;
961 
962 	flags = sdata->vif.offload_flags;
963 
964 	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
965 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
966 		flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
967 
968 		if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
969 		    local->hw.wiphy->frag_threshold != (u32)-1)
970 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
971 
972 		if (local->monitors)
973 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
974 	} else {
975 		flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
976 	}
977 
978 	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
979 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
980 		flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
981 
982 		if (local->monitors &&
983 		    !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
984 			flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
985 	} else {
986 		flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
987 	}
988 
989 	if (sdata->vif.offload_flags == flags)
990 		return false;
991 
992 	sdata->vif.offload_flags = flags;
993 	ieee80211_check_fast_rx_iface(sdata);
994 	return true;
995 }
996 
997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
998 {
999 	struct ieee80211_local *local = sdata->local;
1000 	struct ieee80211_sub_if_data *bss = sdata;
1001 	bool enabled;
1002 
1003 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1004 		if (!sdata->bss)
1005 			return;
1006 
1007 		bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1008 	}
1009 
1010 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1011 	    !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1012 		return;
1013 
1014 	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1015 	if (sdata->wdev.use_4addr &&
1016 	    !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1017 		enabled = false;
1018 
1019 	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1020 					   &ieee80211_dataif_ops;
1021 }
1022 
1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1024 {
1025 	struct ieee80211_local *local = sdata->local;
1026 	struct ieee80211_sub_if_data *vsdata;
1027 
1028 	if (ieee80211_set_sdata_offload_flags(sdata)) {
1029 		drv_update_vif_offload(local, sdata);
1030 		ieee80211_set_vif_encap_ops(sdata);
1031 	}
1032 
1033 	list_for_each_entry(vsdata, &local->interfaces, list) {
1034 		if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1035 		    vsdata->bss != &sdata->u.ap)
1036 			continue;
1037 
1038 		ieee80211_set_vif_encap_ops(vsdata);
1039 	}
1040 }
1041 
1042 void ieee80211_recalc_offload(struct ieee80211_local *local)
1043 {
1044 	struct ieee80211_sub_if_data *sdata;
1045 
1046 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1047 		return;
1048 
1049 	mutex_lock(&local->iflist_mtx);
1050 
1051 	list_for_each_entry(sdata, &local->interfaces, list) {
1052 		if (!ieee80211_sdata_running(sdata))
1053 			continue;
1054 
1055 		ieee80211_recalc_sdata_offload(sdata);
1056 	}
1057 
1058 	mutex_unlock(&local->iflist_mtx);
1059 }
1060 
1061 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1062 				    const int offset)
1063 {
1064 	struct ieee80211_local *local = sdata->local;
1065 	u32 flags = sdata->u.mntr.flags;
1066 
1067 #define ADJUST(_f, _s)	do {					\
1068 	if (flags & MONITOR_FLAG_##_f)				\
1069 		local->fif_##_s += offset;			\
1070 	} while (0)
1071 
1072 	ADJUST(FCSFAIL, fcsfail);
1073 	ADJUST(PLCPFAIL, plcpfail);
1074 	ADJUST(CONTROL, control);
1075 	ADJUST(CONTROL, pspoll);
1076 	ADJUST(OTHER_BSS, other_bss);
1077 
1078 #undef ADJUST
1079 }
1080 
1081 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1082 {
1083 	struct ieee80211_local *local = sdata->local;
1084 	int i;
1085 
1086 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1087 		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1088 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1089 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
1090 			sdata->vif.hw_queue[i] = i;
1091 		else
1092 			sdata->vif.hw_queue[i] = 0;
1093 	}
1094 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1095 }
1096 
1097 static void ieee80211_sdata_init(struct ieee80211_local *local,
1098 				 struct ieee80211_sub_if_data *sdata)
1099 {
1100 	sdata->local = local;
1101 
1102 	/*
1103 	 * Initialize the default link, so we can use link_id 0 for non-MLD,
1104 	 * and that continues to work for non-MLD-aware drivers that use just
1105 	 * vif.bss_conf instead of vif.link_conf.
1106 	 *
1107 	 * Note that we never change this, so if link ID 0 isn't used in an
1108 	 * MLD connection, we get a separate allocation for it.
1109 	 */
1110 	ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1111 }
1112 
1113 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1114 {
1115 	struct ieee80211_sub_if_data *sdata;
1116 	int ret;
1117 
1118 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1119 		return 0;
1120 
1121 	ASSERT_RTNL();
1122 	lockdep_assert_wiphy(local->hw.wiphy);
1123 
1124 	if (local->monitor_sdata)
1125 		return 0;
1126 
1127 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1128 	if (!sdata)
1129 		return -ENOMEM;
1130 
1131 	/* set up data */
1132 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
1133 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1134 		 wiphy_name(local->hw.wiphy));
1135 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1136 
1137 	ieee80211_sdata_init(local, sdata);
1138 
1139 	ieee80211_set_default_queues(sdata);
1140 
1141 	ret = drv_add_interface(local, sdata);
1142 	if (WARN_ON(ret)) {
1143 		/* ok .. stupid driver, it asked for this! */
1144 		kfree(sdata);
1145 		return ret;
1146 	}
1147 
1148 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1149 
1150 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1151 	if (ret) {
1152 		kfree(sdata);
1153 		return ret;
1154 	}
1155 
1156 	mutex_lock(&local->iflist_mtx);
1157 	rcu_assign_pointer(local->monitor_sdata, sdata);
1158 	mutex_unlock(&local->iflist_mtx);
1159 
1160 	mutex_lock(&local->mtx);
1161 	ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1162 					 IEEE80211_CHANCTX_EXCLUSIVE);
1163 	mutex_unlock(&local->mtx);
1164 	if (ret) {
1165 		mutex_lock(&local->iflist_mtx);
1166 		RCU_INIT_POINTER(local->monitor_sdata, NULL);
1167 		mutex_unlock(&local->iflist_mtx);
1168 		synchronize_net();
1169 		drv_remove_interface(local, sdata);
1170 		kfree(sdata);
1171 		return ret;
1172 	}
1173 
1174 	skb_queue_head_init(&sdata->skb_queue);
1175 	skb_queue_head_init(&sdata->status_queue);
1176 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1177 
1178 	return 0;
1179 }
1180 
1181 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1182 {
1183 	struct ieee80211_sub_if_data *sdata;
1184 
1185 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1186 		return;
1187 
1188 	ASSERT_RTNL();
1189 	lockdep_assert_wiphy(local->hw.wiphy);
1190 
1191 	mutex_lock(&local->iflist_mtx);
1192 
1193 	sdata = rcu_dereference_protected(local->monitor_sdata,
1194 					  lockdep_is_held(&local->iflist_mtx));
1195 	if (!sdata) {
1196 		mutex_unlock(&local->iflist_mtx);
1197 		return;
1198 	}
1199 
1200 	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1201 	mutex_unlock(&local->iflist_mtx);
1202 
1203 	synchronize_net();
1204 
1205 	mutex_lock(&local->mtx);
1206 	ieee80211_link_release_channel(&sdata->deflink);
1207 	mutex_unlock(&local->mtx);
1208 
1209 	drv_remove_interface(local, sdata);
1210 
1211 	kfree(sdata);
1212 }
1213 
1214 /*
1215  * NOTE: Be very careful when changing this function, it must NOT return
1216  * an error on interface type changes that have been pre-checked, so most
1217  * checks should be in ieee80211_check_concurrent_iface.
1218  */
1219 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1220 {
1221 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1222 	struct net_device *dev = wdev->netdev;
1223 	struct ieee80211_local *local = sdata->local;
1224 	u32 changed = 0;
1225 	int res;
1226 	u32 hw_reconf_flags = 0;
1227 
1228 	switch (sdata->vif.type) {
1229 	case NL80211_IFTYPE_AP_VLAN: {
1230 		struct ieee80211_sub_if_data *master;
1231 
1232 		if (!sdata->bss)
1233 			return -ENOLINK;
1234 
1235 		mutex_lock(&local->mtx);
1236 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1237 		mutex_unlock(&local->mtx);
1238 
1239 		master = container_of(sdata->bss,
1240 				      struct ieee80211_sub_if_data, u.ap);
1241 		sdata->control_port_protocol =
1242 			master->control_port_protocol;
1243 		sdata->control_port_no_encrypt =
1244 			master->control_port_no_encrypt;
1245 		sdata->control_port_over_nl80211 =
1246 			master->control_port_over_nl80211;
1247 		sdata->control_port_no_preauth =
1248 			master->control_port_no_preauth;
1249 		sdata->vif.cab_queue = master->vif.cab_queue;
1250 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1251 		       sizeof(sdata->vif.hw_queue));
1252 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1253 
1254 		mutex_lock(&local->key_mtx);
1255 		sdata->crypto_tx_tailroom_needed_cnt +=
1256 			master->crypto_tx_tailroom_needed_cnt;
1257 		mutex_unlock(&local->key_mtx);
1258 
1259 		break;
1260 		}
1261 	case NL80211_IFTYPE_AP:
1262 		sdata->bss = &sdata->u.ap;
1263 		break;
1264 	case NL80211_IFTYPE_MESH_POINT:
1265 	case NL80211_IFTYPE_STATION:
1266 	case NL80211_IFTYPE_MONITOR:
1267 	case NL80211_IFTYPE_ADHOC:
1268 	case NL80211_IFTYPE_P2P_DEVICE:
1269 	case NL80211_IFTYPE_OCB:
1270 	case NL80211_IFTYPE_NAN:
1271 		/* no special treatment */
1272 		break;
1273 	case NL80211_IFTYPE_UNSPECIFIED:
1274 	case NUM_NL80211_IFTYPES:
1275 	case NL80211_IFTYPE_P2P_CLIENT:
1276 	case NL80211_IFTYPE_P2P_GO:
1277 	case NL80211_IFTYPE_WDS:
1278 		/* cannot happen */
1279 		WARN_ON(1);
1280 		break;
1281 	}
1282 
1283 	if (local->open_count == 0) {
1284 		res = drv_start(local);
1285 		if (res)
1286 			goto err_del_bss;
1287 		/* we're brought up, everything changes */
1288 		hw_reconf_flags = ~0;
1289 		ieee80211_led_radio(local, true);
1290 		ieee80211_mod_tpt_led_trig(local,
1291 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1292 	}
1293 
1294 	/*
1295 	 * Copy the hopefully now-present MAC address to
1296 	 * this interface, if it has the special null one.
1297 	 */
1298 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
1299 		eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1300 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1301 
1302 		if (!is_valid_ether_addr(dev->dev_addr)) {
1303 			res = -EADDRNOTAVAIL;
1304 			goto err_stop;
1305 		}
1306 	}
1307 
1308 	switch (sdata->vif.type) {
1309 	case NL80211_IFTYPE_AP_VLAN:
1310 		/* no need to tell driver, but set carrier and chanctx */
1311 		if (sdata->bss->active) {
1312 			ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1313 			netif_carrier_on(dev);
1314 			ieee80211_set_vif_encap_ops(sdata);
1315 		} else {
1316 			netif_carrier_off(dev);
1317 		}
1318 		break;
1319 	case NL80211_IFTYPE_MONITOR:
1320 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1321 			local->cooked_mntrs++;
1322 			break;
1323 		}
1324 
1325 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1326 			res = drv_add_interface(local, sdata);
1327 			if (res)
1328 				goto err_stop;
1329 		} else if (local->monitors == 0 && local->open_count == 0) {
1330 			res = ieee80211_add_virtual_monitor(local);
1331 			if (res)
1332 				goto err_stop;
1333 		}
1334 
1335 		/* must be before the call to ieee80211_configure_filter */
1336 		local->monitors++;
1337 		if (local->monitors == 1) {
1338 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1339 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1340 		}
1341 
1342 		ieee80211_adjust_monitor_flags(sdata, 1);
1343 		ieee80211_configure_filter(local);
1344 		ieee80211_recalc_offload(local);
1345 		mutex_lock(&local->mtx);
1346 		ieee80211_recalc_idle(local);
1347 		mutex_unlock(&local->mtx);
1348 
1349 		netif_carrier_on(dev);
1350 		break;
1351 	default:
1352 		if (coming_up) {
1353 			ieee80211_del_virtual_monitor(local);
1354 			ieee80211_set_sdata_offload_flags(sdata);
1355 
1356 			res = drv_add_interface(local, sdata);
1357 			if (res)
1358 				goto err_stop;
1359 
1360 			ieee80211_set_vif_encap_ops(sdata);
1361 			res = ieee80211_check_queues(sdata,
1362 				ieee80211_vif_type_p2p(&sdata->vif));
1363 			if (res)
1364 				goto err_del_interface;
1365 		}
1366 
1367 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
1368 			local->fif_pspoll++;
1369 			local->fif_probe_req++;
1370 
1371 			ieee80211_configure_filter(local);
1372 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1373 			local->fif_probe_req++;
1374 		}
1375 
1376 		if (sdata->vif.probe_req_reg)
1377 			drv_config_iface_filter(local, sdata,
1378 						FIF_PROBE_REQ,
1379 						FIF_PROBE_REQ);
1380 
1381 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1382 		    sdata->vif.type != NL80211_IFTYPE_NAN)
1383 			changed |= ieee80211_reset_erp_info(sdata);
1384 		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1385 						  changed);
1386 
1387 		switch (sdata->vif.type) {
1388 		case NL80211_IFTYPE_STATION:
1389 		case NL80211_IFTYPE_ADHOC:
1390 		case NL80211_IFTYPE_AP:
1391 		case NL80211_IFTYPE_MESH_POINT:
1392 		case NL80211_IFTYPE_OCB:
1393 			netif_carrier_off(dev);
1394 			break;
1395 		case NL80211_IFTYPE_P2P_DEVICE:
1396 		case NL80211_IFTYPE_NAN:
1397 			break;
1398 		default:
1399 			/* not reached */
1400 			WARN_ON(1);
1401 		}
1402 
1403 		/*
1404 		 * Set default queue parameters so drivers don't
1405 		 * need to initialise the hardware if the hardware
1406 		 * doesn't start up with sane defaults.
1407 		 * Enable QoS for anything but station interfaces.
1408 		 */
1409 		ieee80211_set_wmm_default(&sdata->deflink, true,
1410 			sdata->vif.type != NL80211_IFTYPE_STATION);
1411 	}
1412 
1413 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1414 
1415 	switch (sdata->vif.type) {
1416 	case NL80211_IFTYPE_P2P_DEVICE:
1417 		rcu_assign_pointer(local->p2p_sdata, sdata);
1418 		break;
1419 	case NL80211_IFTYPE_MONITOR:
1420 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1421 			break;
1422 		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1423 		break;
1424 	default:
1425 		break;
1426 	}
1427 
1428 	/*
1429 	 * set_multicast_list will be invoked by the networking core
1430 	 * which will check whether any increments here were done in
1431 	 * error and sync them down to the hardware as filter flags.
1432 	 */
1433 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1434 		atomic_inc(&local->iff_allmultis);
1435 
1436 	if (coming_up)
1437 		local->open_count++;
1438 
1439 	if (hw_reconf_flags)
1440 		ieee80211_hw_config(local, hw_reconf_flags);
1441 
1442 	ieee80211_recalc_ps(local);
1443 
1444 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1445 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1446 	    local->ops->wake_tx_queue) {
1447 		/* XXX: for AP_VLAN, actually track AP queues */
1448 		if (dev)
1449 			netif_tx_start_all_queues(dev);
1450 	} else if (dev) {
1451 		unsigned long flags;
1452 		int n_acs = IEEE80211_NUM_ACS;
1453 		int ac;
1454 
1455 		if (local->hw.queues < IEEE80211_NUM_ACS)
1456 			n_acs = 1;
1457 
1458 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1459 		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1460 		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1461 		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1462 			for (ac = 0; ac < n_acs; ac++) {
1463 				int ac_queue = sdata->vif.hw_queue[ac];
1464 
1465 				if (local->queue_stop_reasons[ac_queue] == 0 &&
1466 				    skb_queue_empty(&local->pending[ac_queue]))
1467 					netif_start_subqueue(dev, ac);
1468 			}
1469 		}
1470 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1471 	}
1472 
1473 	return 0;
1474  err_del_interface:
1475 	drv_remove_interface(local, sdata);
1476  err_stop:
1477 	if (!local->open_count)
1478 		drv_stop(local);
1479  err_del_bss:
1480 	sdata->bss = NULL;
1481 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1482 		mutex_lock(&local->mtx);
1483 		list_del(&sdata->u.vlan.list);
1484 		mutex_unlock(&local->mtx);
1485 	}
1486 	/* might already be clear but that doesn't matter */
1487 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1488 	return res;
1489 }
1490 
1491 static void ieee80211_if_free(struct net_device *dev)
1492 {
1493 	free_percpu(dev->tstats);
1494 }
1495 
1496 static void ieee80211_if_setup(struct net_device *dev)
1497 {
1498 	ether_setup(dev);
1499 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1500 	dev->netdev_ops = &ieee80211_dataif_ops;
1501 	dev->needs_free_netdev = true;
1502 	dev->priv_destructor = ieee80211_if_free;
1503 }
1504 
1505 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1506 {
1507 	ieee80211_if_setup(dev);
1508 	dev->priv_flags |= IFF_NO_QUEUE;
1509 }
1510 
1511 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1512 					struct ieee80211_sub_if_data *sdata,
1513 					struct sk_buff *skb)
1514 {
1515 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1516 
1517 	if (ieee80211_is_action(mgmt->frame_control) &&
1518 	    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1519 		struct sta_info *sta;
1520 		int len = skb->len;
1521 
1522 		mutex_lock(&local->sta_mtx);
1523 		sta = sta_info_get_bss(sdata, mgmt->sa);
1524 		if (sta) {
1525 			switch (mgmt->u.action.u.addba_req.action_code) {
1526 			case WLAN_ACTION_ADDBA_REQ:
1527 				ieee80211_process_addba_request(local, sta,
1528 								mgmt, len);
1529 				break;
1530 			case WLAN_ACTION_ADDBA_RESP:
1531 				ieee80211_process_addba_resp(local, sta,
1532 							     mgmt, len);
1533 				break;
1534 			case WLAN_ACTION_DELBA:
1535 				ieee80211_process_delba(sdata, sta,
1536 							mgmt, len);
1537 				break;
1538 			default:
1539 				WARN_ON(1);
1540 				break;
1541 			}
1542 		}
1543 		mutex_unlock(&local->sta_mtx);
1544 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1545 		   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1546 		switch (mgmt->u.action.u.vht_group_notif.action_code) {
1547 		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1548 			struct ieee80211_rx_status *status;
1549 			enum nl80211_band band;
1550 			struct sta_info *sta;
1551 			u8 opmode;
1552 
1553 			status = IEEE80211_SKB_RXCB(skb);
1554 			band = status->band;
1555 			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1556 
1557 			mutex_lock(&local->sta_mtx);
1558 			sta = sta_info_get_bss(sdata, mgmt->sa);
1559 
1560 			if (sta)
1561 				ieee80211_vht_handle_opmode(sdata,
1562 							    &sta->deflink,
1563 							    opmode, band);
1564 
1565 			mutex_unlock(&local->sta_mtx);
1566 			break;
1567 		}
1568 		case WLAN_VHT_ACTION_GROUPID_MGMT:
1569 			ieee80211_process_mu_groups(sdata, &sdata->deflink,
1570 						    mgmt);
1571 			break;
1572 		default:
1573 			WARN_ON(1);
1574 			break;
1575 		}
1576 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1577 		   mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1578 		switch (mgmt->u.action.u.s1g.action_code) {
1579 		case WLAN_S1G_TWT_TEARDOWN:
1580 		case WLAN_S1G_TWT_SETUP:
1581 			ieee80211_s1g_rx_twt_action(sdata, skb);
1582 			break;
1583 		default:
1584 			break;
1585 		}
1586 	} else if (ieee80211_is_ext(mgmt->frame_control)) {
1587 		if (sdata->vif.type == NL80211_IFTYPE_STATION)
1588 			ieee80211_sta_rx_queued_ext(sdata, skb);
1589 		else
1590 			WARN_ON(1);
1591 	} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1592 		struct ieee80211_hdr *hdr = (void *)mgmt;
1593 		struct sta_info *sta;
1594 
1595 		/*
1596 		 * So the frame isn't mgmt, but frame_control
1597 		 * is at the right place anyway, of course, so
1598 		 * the if statement is correct.
1599 		 *
1600 		 * Warn if we have other data frame types here,
1601 		 * they must not get here.
1602 		 */
1603 		WARN_ON(hdr->frame_control &
1604 				cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1605 		WARN_ON(!(hdr->seq_ctrl &
1606 				cpu_to_le16(IEEE80211_SCTL_FRAG)));
1607 		/*
1608 		 * This was a fragment of a frame, received while
1609 		 * a block-ack session was active. That cannot be
1610 		 * right, so terminate the session.
1611 		 */
1612 		mutex_lock(&local->sta_mtx);
1613 		sta = sta_info_get_bss(sdata, mgmt->sa);
1614 		if (sta) {
1615 			u16 tid = ieee80211_get_tid(hdr);
1616 
1617 			__ieee80211_stop_rx_ba_session(
1618 				sta, tid, WLAN_BACK_RECIPIENT,
1619 				WLAN_REASON_QSTA_REQUIRE_SETUP,
1620 				true);
1621 		}
1622 		mutex_unlock(&local->sta_mtx);
1623 	} else switch (sdata->vif.type) {
1624 	case NL80211_IFTYPE_STATION:
1625 		ieee80211_sta_rx_queued_mgmt(sdata, skb);
1626 		break;
1627 	case NL80211_IFTYPE_ADHOC:
1628 		ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1629 		break;
1630 	case NL80211_IFTYPE_MESH_POINT:
1631 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1632 			break;
1633 		ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1634 		break;
1635 	default:
1636 		WARN(1, "frame for unexpected interface type");
1637 		break;
1638 	}
1639 }
1640 
1641 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1642 					   struct sk_buff *skb)
1643 {
1644 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1645 
1646 	if (ieee80211_is_action(mgmt->frame_control) &&
1647 	    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1648 		switch (mgmt->u.action.u.s1g.action_code) {
1649 		case WLAN_S1G_TWT_TEARDOWN:
1650 		case WLAN_S1G_TWT_SETUP:
1651 			ieee80211_s1g_status_twt_action(sdata, skb);
1652 			break;
1653 		default:
1654 			break;
1655 		}
1656 	}
1657 }
1658 
1659 static void ieee80211_iface_work(struct work_struct *work)
1660 {
1661 	struct ieee80211_sub_if_data *sdata =
1662 		container_of(work, struct ieee80211_sub_if_data, work);
1663 	struct ieee80211_local *local = sdata->local;
1664 	struct sk_buff *skb;
1665 
1666 	if (!ieee80211_sdata_running(sdata))
1667 		return;
1668 
1669 	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1670 		return;
1671 
1672 	if (!ieee80211_can_run_worker(local))
1673 		return;
1674 
1675 	/* first process frames */
1676 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1677 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1678 
1679 		if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1680 			ieee80211_process_tdls_channel_switch(sdata, skb);
1681 		else
1682 			ieee80211_iface_process_skb(local, sdata, skb);
1683 
1684 		kfree_skb(skb);
1685 		kcov_remote_stop();
1686 	}
1687 
1688 	/* process status queue */
1689 	while ((skb = skb_dequeue(&sdata->status_queue))) {
1690 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1691 
1692 		ieee80211_iface_process_status(sdata, skb);
1693 		kfree_skb(skb);
1694 
1695 		kcov_remote_stop();
1696 	}
1697 
1698 	/* then other type-dependent work */
1699 	switch (sdata->vif.type) {
1700 	case NL80211_IFTYPE_STATION:
1701 		ieee80211_sta_work(sdata);
1702 		break;
1703 	case NL80211_IFTYPE_ADHOC:
1704 		ieee80211_ibss_work(sdata);
1705 		break;
1706 	case NL80211_IFTYPE_MESH_POINT:
1707 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1708 			break;
1709 		ieee80211_mesh_work(sdata);
1710 		break;
1711 	case NL80211_IFTYPE_OCB:
1712 		ieee80211_ocb_work(sdata);
1713 		break;
1714 	default:
1715 		break;
1716 	}
1717 }
1718 
1719 static void ieee80211_recalc_smps_work(struct work_struct *work)
1720 {
1721 	struct ieee80211_sub_if_data *sdata =
1722 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1723 
1724 	ieee80211_recalc_smps(sdata, &sdata->deflink);
1725 }
1726 
1727 /*
1728  * Helper function to initialise an interface to a specific type.
1729  */
1730 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1731 				  enum nl80211_iftype type)
1732 {
1733 	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1734 						    0xff, 0xff, 0xff};
1735 
1736 	/* clear type-dependent unions */
1737 	memset(&sdata->u, 0, sizeof(sdata->u));
1738 	memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1739 
1740 	/* and set some type-dependent values */
1741 	sdata->vif.type = type;
1742 	sdata->vif.p2p = false;
1743 	sdata->wdev.iftype = type;
1744 
1745 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1746 	sdata->control_port_no_encrypt = false;
1747 	sdata->control_port_over_nl80211 = false;
1748 	sdata->control_port_no_preauth = false;
1749 	sdata->vif.cfg.idle = true;
1750 	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1751 
1752 	sdata->noack_map = 0;
1753 
1754 	/* only monitor/p2p-device differ */
1755 	if (sdata->dev) {
1756 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1757 		sdata->dev->type = ARPHRD_ETHER;
1758 	}
1759 
1760 	skb_queue_head_init(&sdata->skb_queue);
1761 	skb_queue_head_init(&sdata->status_queue);
1762 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1763 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1764 
1765 	switch (type) {
1766 	case NL80211_IFTYPE_P2P_GO:
1767 		type = NL80211_IFTYPE_AP;
1768 		sdata->vif.type = type;
1769 		sdata->vif.p2p = true;
1770 		fallthrough;
1771 	case NL80211_IFTYPE_AP:
1772 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1773 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1774 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1775 		break;
1776 	case NL80211_IFTYPE_P2P_CLIENT:
1777 		type = NL80211_IFTYPE_STATION;
1778 		sdata->vif.type = type;
1779 		sdata->vif.p2p = true;
1780 		fallthrough;
1781 	case NL80211_IFTYPE_STATION:
1782 		sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1783 		ieee80211_sta_setup_sdata(sdata);
1784 		break;
1785 	case NL80211_IFTYPE_OCB:
1786 		sdata->vif.bss_conf.bssid = bssid_wildcard;
1787 		ieee80211_ocb_setup_sdata(sdata);
1788 		break;
1789 	case NL80211_IFTYPE_ADHOC:
1790 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1791 		ieee80211_ibss_setup_sdata(sdata);
1792 		break;
1793 	case NL80211_IFTYPE_MESH_POINT:
1794 		if (ieee80211_vif_is_mesh(&sdata->vif))
1795 			ieee80211_mesh_init_sdata(sdata);
1796 		break;
1797 	case NL80211_IFTYPE_MONITOR:
1798 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1799 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1800 		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1801 				      MONITOR_FLAG_OTHER_BSS;
1802 		break;
1803 	case NL80211_IFTYPE_NAN:
1804 		idr_init(&sdata->u.nan.function_inst_ids);
1805 		spin_lock_init(&sdata->u.nan.func_lock);
1806 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1807 		break;
1808 	case NL80211_IFTYPE_AP_VLAN:
1809 	case NL80211_IFTYPE_P2P_DEVICE:
1810 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1811 		break;
1812 	case NL80211_IFTYPE_UNSPECIFIED:
1813 	case NL80211_IFTYPE_WDS:
1814 	case NUM_NL80211_IFTYPES:
1815 		WARN_ON(1);
1816 		break;
1817 	}
1818 
1819 	/* need to do this after the switch so vif.type is correct */
1820 	ieee80211_link_setup(&sdata->deflink);
1821 
1822 	ieee80211_debugfs_add_netdev(sdata);
1823 }
1824 
1825 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1826 					   enum nl80211_iftype type)
1827 {
1828 	struct ieee80211_local *local = sdata->local;
1829 	int ret, err;
1830 	enum nl80211_iftype internal_type = type;
1831 	bool p2p = false;
1832 
1833 	ASSERT_RTNL();
1834 
1835 	if (!local->ops->change_interface)
1836 		return -EBUSY;
1837 
1838 	/* for now, don't support changing while links exist */
1839 	if (sdata->vif.valid_links)
1840 		return -EBUSY;
1841 
1842 	switch (sdata->vif.type) {
1843 	case NL80211_IFTYPE_AP:
1844 		if (!list_empty(&sdata->u.ap.vlans))
1845 			return -EBUSY;
1846 		break;
1847 	case NL80211_IFTYPE_STATION:
1848 	case NL80211_IFTYPE_ADHOC:
1849 	case NL80211_IFTYPE_OCB:
1850 		/*
1851 		 * Could maybe also all others here?
1852 		 * Just not sure how that interacts
1853 		 * with the RX/config path e.g. for
1854 		 * mesh.
1855 		 */
1856 		break;
1857 	default:
1858 		return -EBUSY;
1859 	}
1860 
1861 	switch (type) {
1862 	case NL80211_IFTYPE_AP:
1863 	case NL80211_IFTYPE_STATION:
1864 	case NL80211_IFTYPE_ADHOC:
1865 	case NL80211_IFTYPE_OCB:
1866 		/*
1867 		 * Could probably support everything
1868 		 * but here.
1869 		 */
1870 		break;
1871 	case NL80211_IFTYPE_P2P_CLIENT:
1872 		p2p = true;
1873 		internal_type = NL80211_IFTYPE_STATION;
1874 		break;
1875 	case NL80211_IFTYPE_P2P_GO:
1876 		p2p = true;
1877 		internal_type = NL80211_IFTYPE_AP;
1878 		break;
1879 	default:
1880 		return -EBUSY;
1881 	}
1882 
1883 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1884 	if (ret)
1885 		return ret;
1886 
1887 	ieee80211_stop_vif_queues(local, sdata,
1888 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1889 	synchronize_net();
1890 
1891 	ieee80211_do_stop(sdata, false);
1892 
1893 	ieee80211_teardown_sdata(sdata);
1894 
1895 	ieee80211_set_sdata_offload_flags(sdata);
1896 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1897 	if (ret)
1898 		type = ieee80211_vif_type_p2p(&sdata->vif);
1899 
1900 	/*
1901 	 * Ignore return value here, there's not much we can do since
1902 	 * the driver changed the interface type internally already.
1903 	 * The warnings will hopefully make driver authors fix it :-)
1904 	 */
1905 	ieee80211_check_queues(sdata, type);
1906 
1907 	ieee80211_setup_sdata(sdata, type);
1908 	ieee80211_set_vif_encap_ops(sdata);
1909 
1910 	err = ieee80211_do_open(&sdata->wdev, false);
1911 	WARN(err, "type change: do_open returned %d", err);
1912 
1913 	ieee80211_wake_vif_queues(local, sdata,
1914 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1915 	return ret;
1916 }
1917 
1918 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1919 			     enum nl80211_iftype type)
1920 {
1921 	int ret;
1922 
1923 	ASSERT_RTNL();
1924 
1925 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1926 		return 0;
1927 
1928 	if (ieee80211_sdata_running(sdata)) {
1929 		ret = ieee80211_runtime_change_iftype(sdata, type);
1930 		if (ret)
1931 			return ret;
1932 	} else {
1933 		/* Purge and reset type-dependent state. */
1934 		ieee80211_teardown_sdata(sdata);
1935 		ieee80211_setup_sdata(sdata, type);
1936 	}
1937 
1938 	/* reset some values that shouldn't be kept across type changes */
1939 	if (type == NL80211_IFTYPE_STATION)
1940 		sdata->u.mgd.use_4addr = false;
1941 
1942 	return 0;
1943 }
1944 
1945 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1946 				       u8 *perm_addr, enum nl80211_iftype type)
1947 {
1948 	struct ieee80211_sub_if_data *sdata;
1949 	u64 mask, start, addr, val, inc;
1950 	u8 *m;
1951 	u8 tmp_addr[ETH_ALEN];
1952 	int i;
1953 
1954 	/* default ... something at least */
1955 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1956 
1957 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1958 	    local->hw.wiphy->n_addresses <= 1)
1959 		return;
1960 
1961 	mutex_lock(&local->iflist_mtx);
1962 
1963 	switch (type) {
1964 	case NL80211_IFTYPE_MONITOR:
1965 		/* doesn't matter */
1966 		break;
1967 	case NL80211_IFTYPE_AP_VLAN:
1968 		/* match up with an AP interface */
1969 		list_for_each_entry(sdata, &local->interfaces, list) {
1970 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1971 				continue;
1972 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1973 			break;
1974 		}
1975 		/* keep default if no AP interface present */
1976 		break;
1977 	case NL80211_IFTYPE_P2P_CLIENT:
1978 	case NL80211_IFTYPE_P2P_GO:
1979 		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1980 			list_for_each_entry(sdata, &local->interfaces, list) {
1981 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1982 					continue;
1983 				if (!ieee80211_sdata_running(sdata))
1984 					continue;
1985 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1986 				goto out_unlock;
1987 			}
1988 		}
1989 		fallthrough;
1990 	default:
1991 		/* assign a new address if possible -- try n_addresses first */
1992 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1993 			bool used = false;
1994 
1995 			list_for_each_entry(sdata, &local->interfaces, list) {
1996 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1997 						     sdata->vif.addr)) {
1998 					used = true;
1999 					break;
2000 				}
2001 			}
2002 
2003 			if (!used) {
2004 				memcpy(perm_addr,
2005 				       local->hw.wiphy->addresses[i].addr,
2006 				       ETH_ALEN);
2007 				break;
2008 			}
2009 		}
2010 
2011 		/* try mask if available */
2012 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2013 			break;
2014 
2015 		m = local->hw.wiphy->addr_mask;
2016 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2017 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2018 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2019 
2020 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2021 			/* not a contiguous mask ... not handled now! */
2022 			pr_info("not contiguous\n");
2023 			break;
2024 		}
2025 
2026 		/*
2027 		 * Pick address of existing interface in case user changed
2028 		 * MAC address manually, default to perm_addr.
2029 		 */
2030 		m = local->hw.wiphy->perm_addr;
2031 		list_for_each_entry(sdata, &local->interfaces, list) {
2032 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2033 				continue;
2034 			m = sdata->vif.addr;
2035 			break;
2036 		}
2037 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2038 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2039 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2040 
2041 		inc = 1ULL<<__ffs64(mask);
2042 		val = (start & mask);
2043 		addr = (start & ~mask) | (val & mask);
2044 		do {
2045 			bool used = false;
2046 
2047 			tmp_addr[5] = addr >> 0*8;
2048 			tmp_addr[4] = addr >> 1*8;
2049 			tmp_addr[3] = addr >> 2*8;
2050 			tmp_addr[2] = addr >> 3*8;
2051 			tmp_addr[1] = addr >> 4*8;
2052 			tmp_addr[0] = addr >> 5*8;
2053 
2054 			val += inc;
2055 
2056 			list_for_each_entry(sdata, &local->interfaces, list) {
2057 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2058 					used = true;
2059 					break;
2060 				}
2061 			}
2062 
2063 			if (!used) {
2064 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
2065 				break;
2066 			}
2067 			addr = (start & ~mask) | (val & mask);
2068 		} while (addr != start);
2069 
2070 		break;
2071 	}
2072 
2073  out_unlock:
2074 	mutex_unlock(&local->iflist_mtx);
2075 }
2076 
2077 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2078 		     unsigned char name_assign_type,
2079 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
2080 		     struct vif_params *params)
2081 {
2082 	struct net_device *ndev = NULL;
2083 	struct ieee80211_sub_if_data *sdata = NULL;
2084 	struct txq_info *txqi;
2085 	void (*if_setup)(struct net_device *dev);
2086 	int ret, i;
2087 	int txqs = 1;
2088 
2089 	ASSERT_RTNL();
2090 
2091 	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2092 		struct wireless_dev *wdev;
2093 
2094 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2095 				GFP_KERNEL);
2096 		if (!sdata)
2097 			return -ENOMEM;
2098 		wdev = &sdata->wdev;
2099 
2100 		sdata->dev = NULL;
2101 		strscpy(sdata->name, name, IFNAMSIZ);
2102 		ieee80211_assign_perm_addr(local, wdev->address, type);
2103 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2104 		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2105 	} else {
2106 		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2107 				 sizeof(void *));
2108 		int txq_size = 0;
2109 
2110 		if (local->ops->wake_tx_queue &&
2111 		    type != NL80211_IFTYPE_AP_VLAN &&
2112 		    (type != NL80211_IFTYPE_MONITOR ||
2113 		     (params->flags & MONITOR_FLAG_ACTIVE)))
2114 			txq_size += sizeof(struct txq_info) +
2115 				    local->hw.txq_data_size;
2116 
2117 		if (local->ops->wake_tx_queue) {
2118 			if_setup = ieee80211_if_setup_no_queue;
2119 		} else {
2120 			if_setup = ieee80211_if_setup;
2121 			if (local->hw.queues >= IEEE80211_NUM_ACS)
2122 				txqs = IEEE80211_NUM_ACS;
2123 		}
2124 
2125 		ndev = alloc_netdev_mqs(size + txq_size,
2126 					name, name_assign_type,
2127 					if_setup, txqs, 1);
2128 		if (!ndev)
2129 			return -ENOMEM;
2130 
2131 		if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2132 			ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2133 
2134 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2135 
2136 		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2137 		if (!ndev->tstats) {
2138 			free_netdev(ndev);
2139 			return -ENOMEM;
2140 		}
2141 
2142 		ndev->needed_headroom = local->tx_headroom +
2143 					4*6 /* four MAC addresses */
2144 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2145 					+ 6 /* mesh */
2146 					+ 8 /* rfc1042/bridge tunnel */
2147 					- ETH_HLEN /* ethernet hard_header_len */
2148 					+ IEEE80211_ENCRYPT_HEADROOM;
2149 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2150 
2151 		ret = dev_alloc_name(ndev, ndev->name);
2152 		if (ret < 0) {
2153 			ieee80211_if_free(ndev);
2154 			free_netdev(ndev);
2155 			return ret;
2156 		}
2157 
2158 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2159 		if (is_valid_ether_addr(params->macaddr))
2160 			eth_hw_addr_set(ndev, params->macaddr);
2161 		else
2162 			eth_hw_addr_set(ndev, ndev->perm_addr);
2163 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2164 
2165 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2166 		sdata = netdev_priv(ndev);
2167 		ndev->ieee80211_ptr = &sdata->wdev;
2168 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2169 		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2170 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
2171 
2172 		if (txq_size) {
2173 			txqi = netdev_priv(ndev) + size;
2174 			ieee80211_txq_init(sdata, NULL, txqi, 0);
2175 		}
2176 
2177 		sdata->dev = ndev;
2178 	}
2179 
2180 	/* initialise type-independent data */
2181 	sdata->wdev.wiphy = local->hw.wiphy;
2182 
2183 	ieee80211_sdata_init(local, sdata);
2184 
2185 	ieee80211_init_frag_cache(&sdata->frags);
2186 
2187 	INIT_LIST_HEAD(&sdata->key_list);
2188 
2189 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2190 			  ieee80211_delayed_tailroom_dec);
2191 
2192 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
2193 		struct ieee80211_supported_band *sband;
2194 		sband = local->hw.wiphy->bands[i];
2195 		sdata->rc_rateidx_mask[i] =
2196 			sband ? (1 << sband->n_bitrates) - 1 : 0;
2197 		if (sband) {
2198 			__le16 cap;
2199 			u16 *vht_rate_mask;
2200 
2201 			memcpy(sdata->rc_rateidx_mcs_mask[i],
2202 			       sband->ht_cap.mcs.rx_mask,
2203 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2204 
2205 			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2206 			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2207 			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2208 		} else {
2209 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
2210 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2211 			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2212 			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2213 		}
2214 	}
2215 
2216 	ieee80211_set_default_queues(sdata);
2217 
2218 	sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2219 	sdata->deflink.user_power_level = local->user_power_level;
2220 
2221 	/* setup type-dependent data */
2222 	ieee80211_setup_sdata(sdata, type);
2223 
2224 	if (ndev) {
2225 		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2226 		if (type == NL80211_IFTYPE_STATION)
2227 			sdata->u.mgd.use_4addr = params->use_4addr;
2228 
2229 		ndev->features |= local->hw.netdev_features;
2230 		ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2231 		ndev->hw_features |= ndev->features &
2232 					MAC80211_SUPPORTED_FEATURES_TX;
2233 
2234 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2235 
2236 		/* MTU range is normally 256 - 2304, where the upper limit is
2237 		 * the maximum MSDU size. Monitor interfaces send and receive
2238 		 * MPDU and A-MSDU frames which may be much larger so we do
2239 		 * not impose an upper limit in that case.
2240 		 */
2241 		ndev->min_mtu = 256;
2242 		if (type == NL80211_IFTYPE_MONITOR)
2243 			ndev->max_mtu = 0;
2244 		else
2245 			ndev->max_mtu = local->hw.max_mtu;
2246 
2247 		ret = cfg80211_register_netdevice(ndev);
2248 		if (ret) {
2249 			free_netdev(ndev);
2250 			return ret;
2251 		}
2252 	}
2253 
2254 	mutex_lock(&local->iflist_mtx);
2255 	list_add_tail_rcu(&sdata->list, &local->interfaces);
2256 	mutex_unlock(&local->iflist_mtx);
2257 
2258 	if (new_wdev)
2259 		*new_wdev = &sdata->wdev;
2260 
2261 	return 0;
2262 }
2263 
2264 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2265 {
2266 	ASSERT_RTNL();
2267 
2268 	mutex_lock(&sdata->local->iflist_mtx);
2269 	list_del_rcu(&sdata->list);
2270 	mutex_unlock(&sdata->local->iflist_mtx);
2271 
2272 	if (sdata->vif.txq)
2273 		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2274 
2275 	synchronize_rcu();
2276 
2277 	cfg80211_unregister_wdev(&sdata->wdev);
2278 
2279 	if (!sdata->dev) {
2280 		ieee80211_teardown_sdata(sdata);
2281 		kfree(sdata);
2282 	}
2283 }
2284 
2285 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2286 {
2287 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2288 		return;
2289 	ieee80211_do_stop(sdata, true);
2290 }
2291 
2292 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2293 {
2294 	struct ieee80211_sub_if_data *sdata, *tmp;
2295 	LIST_HEAD(unreg_list);
2296 	LIST_HEAD(wdev_list);
2297 
2298 	ASSERT_RTNL();
2299 
2300 	/* Before destroying the interfaces, make sure they're all stopped so
2301 	 * that the hardware is stopped. Otherwise, the driver might still be
2302 	 * iterating the interfaces during the shutdown, e.g. from a worker
2303 	 * or from RX processing or similar, and if it does so (using atomic
2304 	 * iteration) while we're manipulating the list, the iteration will
2305 	 * crash.
2306 	 *
2307 	 * After this, the hardware should be stopped and the driver should
2308 	 * have stopped all of its activities, so that we can do RCU-unaware
2309 	 * manipulations of the interface list below.
2310 	 */
2311 	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2312 
2313 	WARN(local->open_count, "%s: open count remains %d\n",
2314 	     wiphy_name(local->hw.wiphy), local->open_count);
2315 
2316 	ieee80211_txq_teardown_flows(local);
2317 
2318 	mutex_lock(&local->iflist_mtx);
2319 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2320 		list_del(&sdata->list);
2321 
2322 		if (sdata->dev)
2323 			unregister_netdevice_queue(sdata->dev, &unreg_list);
2324 		else
2325 			list_add(&sdata->list, &wdev_list);
2326 	}
2327 	mutex_unlock(&local->iflist_mtx);
2328 
2329 	unregister_netdevice_many(&unreg_list);
2330 
2331 	wiphy_lock(local->hw.wiphy);
2332 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2333 		list_del(&sdata->list);
2334 		cfg80211_unregister_wdev(&sdata->wdev);
2335 		kfree(sdata);
2336 	}
2337 	wiphy_unlock(local->hw.wiphy);
2338 }
2339 
2340 static int netdev_notify(struct notifier_block *nb,
2341 			 unsigned long state, void *ptr)
2342 {
2343 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2344 	struct ieee80211_sub_if_data *sdata;
2345 
2346 	if (state != NETDEV_CHANGENAME)
2347 		return NOTIFY_DONE;
2348 
2349 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2350 		return NOTIFY_DONE;
2351 
2352 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2353 		return NOTIFY_DONE;
2354 
2355 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2356 	memcpy(sdata->name, dev->name, IFNAMSIZ);
2357 	ieee80211_debugfs_rename_netdev(sdata);
2358 
2359 	return NOTIFY_OK;
2360 }
2361 
2362 static struct notifier_block mac80211_netdev_notifier = {
2363 	.notifier_call = netdev_notify,
2364 };
2365 
2366 int ieee80211_iface_init(void)
2367 {
2368 	return register_netdevice_notifier(&mac80211_netdev_notifier);
2369 }
2370 
2371 void ieee80211_iface_exit(void)
2372 {
2373 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2374 }
2375 
2376 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2377 {
2378 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2379 		atomic_inc(&sdata->u.ap.num_mcast_sta);
2380 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2381 		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2382 }
2383 
2384 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2385 {
2386 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2387 		atomic_dec(&sdata->u.ap.num_mcast_sta);
2388 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2389 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2390 }
2391