xref: /openbmc/linux/net/mac80211/iface.c (revision 52beb1fc)
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) 2018-2021 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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 		power = min(power, sdata->user_power_level);
65 
66 	if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 		power = min(power, sdata->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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
84 }
85 
86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87 {
88 	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89 		return 0;
90 
91 	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92 	return IEEE80211_CONF_CHANGE_IDLE;
93 }
94 
95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96 {
97 	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98 		return 0;
99 
100 	ieee80211_flush_queues(local, NULL, false);
101 
102 	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103 	return IEEE80211_CONF_CHANGE_IDLE;
104 }
105 
106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107 				   bool force_active)
108 {
109 	bool working, scanning, active;
110 	unsigned int led_trig_start = 0, led_trig_stop = 0;
111 
112 	lockdep_assert_held(&local->mtx);
113 
114 	active = force_active ||
115 		 !list_empty(&local->chanctx_list) ||
116 		 local->monitors;
117 
118 	working = !local->ops->remain_on_channel &&
119 		  !list_empty(&local->roc_list);
120 
121 	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122 		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123 
124 	if (working || scanning)
125 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126 	else
127 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128 
129 	if (active)
130 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131 	else
132 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133 
134 	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
135 
136 	if (working || scanning || active)
137 		return __ieee80211_idle_off(local);
138 	return __ieee80211_idle_on(local);
139 }
140 
141 u32 ieee80211_idle_off(struct ieee80211_local *local)
142 {
143 	return __ieee80211_recalc_idle(local, true);
144 }
145 
146 void ieee80211_recalc_idle(struct ieee80211_local *local)
147 {
148 	u32 change = __ieee80211_recalc_idle(local, false);
149 	if (change)
150 		ieee80211_hw_config(local, change);
151 }
152 
153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154 				bool check_dup)
155 {
156 	struct ieee80211_local *local = sdata->local;
157 	struct ieee80211_sub_if_data *iter;
158 	u64 new, mask, tmp;
159 	u8 *m;
160 	int ret = 0;
161 
162 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
163 		return 0;
164 
165 	m = addr;
166 	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
167 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
168 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
169 
170 	m = local->hw.wiphy->addr_mask;
171 	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
172 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
173 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
174 
175 	if (!check_dup)
176 		return ret;
177 
178 	mutex_lock(&local->iflist_mtx);
179 	list_for_each_entry(iter, &local->interfaces, list) {
180 		if (iter == sdata)
181 			continue;
182 
183 		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
184 		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
185 			continue;
186 
187 		m = iter->vif.addr;
188 		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
189 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
190 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
191 
192 		if ((new & ~mask) != (tmp & ~mask)) {
193 			ret = -EINVAL;
194 			break;
195 		}
196 	}
197 	mutex_unlock(&local->iflist_mtx);
198 
199 	return ret;
200 }
201 
202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
203 {
204 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
205 	struct sockaddr *sa = addr;
206 	bool check_dup = true;
207 	int ret;
208 
209 	if (ieee80211_sdata_running(sdata))
210 		return -EBUSY;
211 
212 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
213 	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
214 		check_dup = false;
215 
216 	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
217 	if (ret)
218 		return ret;
219 
220 	ret = eth_mac_addr(dev, sa);
221 
222 	if (ret == 0)
223 		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
224 
225 	return ret;
226 }
227 
228 static inline int identical_mac_addr_allowed(int type1, int type2)
229 {
230 	return type1 == NL80211_IFTYPE_MONITOR ||
231 		type2 == NL80211_IFTYPE_MONITOR ||
232 		type1 == NL80211_IFTYPE_P2P_DEVICE ||
233 		type2 == NL80211_IFTYPE_P2P_DEVICE ||
234 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
235 		(type1 == NL80211_IFTYPE_AP_VLAN &&
236 			(type2 == NL80211_IFTYPE_AP ||
237 			 type2 == NL80211_IFTYPE_AP_VLAN));
238 }
239 
240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
241 					    enum nl80211_iftype iftype)
242 {
243 	struct ieee80211_local *local = sdata->local;
244 	struct ieee80211_sub_if_data *nsdata;
245 	int ret;
246 
247 	ASSERT_RTNL();
248 
249 	/* we hold the RTNL here so can safely walk the list */
250 	list_for_each_entry(nsdata, &local->interfaces, list) {
251 		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
252 			/*
253 			 * Only OCB and monitor mode may coexist
254 			 */
255 			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
256 			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
257 			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
258 			     nsdata->vif.type == NL80211_IFTYPE_OCB))
259 				return -EBUSY;
260 
261 			/*
262 			 * Allow only a single IBSS interface to be up at any
263 			 * time. This is restricted because beacon distribution
264 			 * cannot work properly if both are in the same IBSS.
265 			 *
266 			 * To remove this restriction we'd have to disallow them
267 			 * from setting the same SSID on different IBSS interfaces
268 			 * belonging to the same hardware. Then, however, we're
269 			 * faced with having to adopt two different TSF timers...
270 			 */
271 			if (iftype == NL80211_IFTYPE_ADHOC &&
272 			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
273 				return -EBUSY;
274 			/*
275 			 * will not add another interface while any channel
276 			 * switch is active.
277 			 */
278 			if (nsdata->vif.csa_active)
279 				return -EBUSY;
280 
281 			/*
282 			 * The remaining checks are only performed for interfaces
283 			 * with the same MAC address.
284 			 */
285 			if (!ether_addr_equal(sdata->vif.addr,
286 					      nsdata->vif.addr))
287 				continue;
288 
289 			/*
290 			 * check whether it may have the same address
291 			 */
292 			if (!identical_mac_addr_allowed(iftype,
293 							nsdata->vif.type))
294 				return -ENOTUNIQ;
295 
296 			/*
297 			 * can only add VLANs to enabled APs
298 			 */
299 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
300 			    nsdata->vif.type == NL80211_IFTYPE_AP)
301 				sdata->bss = &nsdata->u.ap;
302 		}
303 	}
304 
305 	mutex_lock(&local->chanctx_mtx);
306 	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
307 	mutex_unlock(&local->chanctx_mtx);
308 	return ret;
309 }
310 
311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
312 				  enum nl80211_iftype iftype)
313 {
314 	int n_queues = sdata->local->hw.queues;
315 	int i;
316 
317 	if (iftype == NL80211_IFTYPE_NAN)
318 		return 0;
319 
320 	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
321 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
322 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
323 					 IEEE80211_INVAL_HW_QUEUE))
324 				return -EINVAL;
325 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
326 					 n_queues))
327 				return -EINVAL;
328 		}
329 	}
330 
331 	if ((iftype != NL80211_IFTYPE_AP &&
332 	     iftype != NL80211_IFTYPE_P2P_GO &&
333 	     iftype != NL80211_IFTYPE_MESH_POINT) ||
334 	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
335 		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
336 		return 0;
337 	}
338 
339 	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
340 		return -EINVAL;
341 
342 	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
343 		return -EINVAL;
344 
345 	return 0;
346 }
347 
348 static int ieee80211_open(struct net_device *dev)
349 {
350 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
351 	int err;
352 
353 	/* fail early if user set an invalid address */
354 	if (!is_valid_ether_addr(dev->dev_addr))
355 		return -EADDRNOTAVAIL;
356 
357 	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
358 	if (err)
359 		return err;
360 
361 	wiphy_lock(sdata->local->hw.wiphy);
362 	err = ieee80211_do_open(&sdata->wdev, true);
363 	wiphy_unlock(sdata->local->hw.wiphy);
364 
365 	return err;
366 }
367 
368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
369 {
370 	struct ieee80211_local *local = sdata->local;
371 	unsigned long flags;
372 	struct sk_buff *skb, *tmp;
373 	u32 hw_reconf_flags = 0;
374 	int i, flushed;
375 	struct ps_data *ps;
376 	struct cfg80211_chan_def chandef;
377 	bool cancel_scan;
378 	struct cfg80211_nan_func *func;
379 
380 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
381 
382 	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
383 	if (cancel_scan)
384 		ieee80211_scan_cancel(local);
385 
386 	/*
387 	 * Stop TX on this interface first.
388 	 */
389 	if (sdata->dev)
390 		netif_tx_stop_all_queues(sdata->dev);
391 
392 	ieee80211_roc_purge(local, sdata);
393 
394 	switch (sdata->vif.type) {
395 	case NL80211_IFTYPE_STATION:
396 		ieee80211_mgd_stop(sdata);
397 		break;
398 	case NL80211_IFTYPE_ADHOC:
399 		ieee80211_ibss_stop(sdata);
400 		break;
401 	case NL80211_IFTYPE_MONITOR:
402 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
403 			break;
404 		list_del_rcu(&sdata->u.mntr.list);
405 		break;
406 	default:
407 		break;
408 	}
409 
410 	/*
411 	 * Remove all stations associated with this interface.
412 	 *
413 	 * This must be done before calling ops->remove_interface()
414 	 * because otherwise we can later invoke ops->sta_notify()
415 	 * whenever the STAs are removed, and that invalidates driver
416 	 * assumptions about always getting a vif pointer that is valid
417 	 * (because if we remove a STA after ops->remove_interface()
418 	 * the driver will have removed the vif info already!)
419 	 *
420 	 * For AP_VLANs stations may exist since there's nothing else that
421 	 * would have removed them, but in other modes there shouldn't
422 	 * be any stations.
423 	 */
424 	flushed = sta_info_flush(sdata);
425 	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
426 
427 	/* don't count this interface for allmulti while it is down */
428 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
429 		atomic_dec(&local->iff_allmultis);
430 
431 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
432 		local->fif_pspoll--;
433 		local->fif_probe_req--;
434 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
435 		local->fif_probe_req--;
436 	}
437 
438 	if (sdata->dev) {
439 		netif_addr_lock_bh(sdata->dev);
440 		spin_lock_bh(&local->filter_lock);
441 		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
442 				 sdata->dev->addr_len);
443 		spin_unlock_bh(&local->filter_lock);
444 		netif_addr_unlock_bh(sdata->dev);
445 	}
446 
447 	del_timer_sync(&local->dynamic_ps_timer);
448 	cancel_work_sync(&local->dynamic_ps_enable_work);
449 
450 	cancel_work_sync(&sdata->recalc_smps);
451 	sdata_lock(sdata);
452 	mutex_lock(&local->mtx);
453 	sdata->vif.csa_active = false;
454 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
455 		sdata->u.mgd.csa_waiting_bcn = false;
456 	if (sdata->csa_block_tx) {
457 		ieee80211_wake_vif_queues(local, sdata,
458 					  IEEE80211_QUEUE_STOP_REASON_CSA);
459 		sdata->csa_block_tx = false;
460 	}
461 	mutex_unlock(&local->mtx);
462 	sdata_unlock(sdata);
463 
464 	cancel_work_sync(&sdata->csa_finalize_work);
465 	cancel_work_sync(&sdata->color_change_finalize_work);
466 
467 	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
468 
469 	if (sdata->wdev.cac_started) {
470 		chandef = sdata->vif.bss_conf.chandef;
471 		WARN_ON(local->suspended);
472 		mutex_lock(&local->mtx);
473 		ieee80211_vif_release_channel(sdata);
474 		mutex_unlock(&local->mtx);
475 		cfg80211_cac_event(sdata->dev, &chandef,
476 				   NL80211_RADAR_CAC_ABORTED,
477 				   GFP_KERNEL);
478 	}
479 
480 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
481 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
482 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
483 		/* remove all packets in parent bc_buf pointing to this dev */
484 		ps = &sdata->bss->ps;
485 
486 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
487 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
488 			if (skb->dev == sdata->dev) {
489 				__skb_unlink(skb, &ps->bc_buf);
490 				local->total_ps_buffered--;
491 				ieee80211_free_txskb(&local->hw, skb);
492 			}
493 		}
494 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
495 	}
496 
497 	if (going_down)
498 		local->open_count--;
499 
500 	switch (sdata->vif.type) {
501 	case NL80211_IFTYPE_AP_VLAN:
502 		mutex_lock(&local->mtx);
503 		list_del(&sdata->u.vlan.list);
504 		mutex_unlock(&local->mtx);
505 		RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
506 		/* see comment in the default case below */
507 		ieee80211_free_keys(sdata, true);
508 		/* no need to tell driver */
509 		break;
510 	case NL80211_IFTYPE_MONITOR:
511 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
512 			local->cooked_mntrs--;
513 			break;
514 		}
515 
516 		local->monitors--;
517 		if (local->monitors == 0) {
518 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
519 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
520 		}
521 
522 		ieee80211_adjust_monitor_flags(sdata, -1);
523 		break;
524 	case NL80211_IFTYPE_NAN:
525 		/* clean all the functions */
526 		spin_lock_bh(&sdata->u.nan.func_lock);
527 
528 		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
529 			idr_remove(&sdata->u.nan.function_inst_ids, i);
530 			cfg80211_free_nan_func(func);
531 		}
532 		idr_destroy(&sdata->u.nan.function_inst_ids);
533 
534 		spin_unlock_bh(&sdata->u.nan.func_lock);
535 		break;
536 	case NL80211_IFTYPE_P2P_DEVICE:
537 		/* relies on synchronize_rcu() below */
538 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
539 		fallthrough;
540 	default:
541 		cancel_work_sync(&sdata->work);
542 		/*
543 		 * When we get here, the interface is marked down.
544 		 * Free the remaining keys, if there are any
545 		 * (which can happen in AP mode if userspace sets
546 		 * keys before the interface is operating)
547 		 *
548 		 * Force the key freeing to always synchronize_net()
549 		 * to wait for the RX path in case it is using this
550 		 * interface enqueuing frames at this very time on
551 		 * another CPU.
552 		 */
553 		ieee80211_free_keys(sdata, true);
554 		skb_queue_purge(&sdata->skb_queue);
555 		skb_queue_purge(&sdata->status_queue);
556 	}
557 
558 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
559 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
560 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
561 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
562 			if (info->control.vif == &sdata->vif) {
563 				__skb_unlink(skb, &local->pending[i]);
564 				ieee80211_free_txskb(&local->hw, skb);
565 			}
566 		}
567 	}
568 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
569 
570 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
571 		ieee80211_txq_remove_vlan(local, sdata);
572 
573 	sdata->bss = NULL;
574 
575 	if (local->open_count == 0)
576 		ieee80211_clear_tx_pending(local);
577 
578 	sdata->vif.bss_conf.beacon_int = 0;
579 
580 	/*
581 	 * If the interface goes down while suspended, presumably because
582 	 * the device was unplugged and that happens before our resume,
583 	 * then the driver is already unconfigured and the remainder of
584 	 * this function isn't needed.
585 	 * XXX: what about WoWLAN? If the device has software state, e.g.
586 	 *	memory allocated, it might expect teardown commands from
587 	 *	mac80211 here?
588 	 */
589 	if (local->suspended) {
590 		WARN_ON(local->wowlan);
591 		WARN_ON(rcu_access_pointer(local->monitor_sdata));
592 		return;
593 	}
594 
595 	switch (sdata->vif.type) {
596 	case NL80211_IFTYPE_AP_VLAN:
597 		break;
598 	case NL80211_IFTYPE_MONITOR:
599 		if (local->monitors == 0)
600 			ieee80211_del_virtual_monitor(local);
601 
602 		mutex_lock(&local->mtx);
603 		ieee80211_recalc_idle(local);
604 		mutex_unlock(&local->mtx);
605 
606 		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
607 			break;
608 
609 		fallthrough;
610 	default:
611 		if (going_down)
612 			drv_remove_interface(local, sdata);
613 	}
614 
615 	ieee80211_recalc_ps(local);
616 
617 	if (cancel_scan)
618 		flush_delayed_work(&local->scan_work);
619 
620 	if (local->open_count == 0) {
621 		ieee80211_stop_device(local);
622 
623 		/* no reconfiguring after stop! */
624 		return;
625 	}
626 
627 	/* do after stop to avoid reconfiguring when we stop anyway */
628 	ieee80211_configure_filter(local);
629 	ieee80211_hw_config(local, hw_reconf_flags);
630 
631 	if (local->monitors == local->open_count)
632 		ieee80211_add_virtual_monitor(local);
633 }
634 
635 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
636 {
637 	struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
638 	struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
639 
640 	if (!tx_vif)
641 		return;
642 
643 	tx_sdata = vif_to_sdata(tx_vif);
644 	sdata->vif.mbssid_tx_vif = NULL;
645 
646 	list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
647 				 &tx_sdata->local->interfaces, list) {
648 		if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
649 		    non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
650 		    ieee80211_sdata_running(non_tx_sdata)) {
651 			non_tx_sdata->vif.mbssid_tx_vif = NULL;
652 			dev_close(non_tx_sdata->wdev.netdev);
653 		}
654 	}
655 
656 	if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
657 		tx_sdata->vif.mbssid_tx_vif = NULL;
658 		dev_close(tx_sdata->wdev.netdev);
659 	}
660 }
661 
662 static int ieee80211_stop(struct net_device *dev)
663 {
664 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
665 
666 	/* close dependent VLAN and MBSSID interfaces before locking wiphy */
667 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
668 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
669 
670 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
671 					 u.vlan.list)
672 			dev_close(vlan->dev);
673 
674 		ieee80211_stop_mbssid(sdata);
675 	}
676 
677 	wiphy_lock(sdata->local->hw.wiphy);
678 	ieee80211_do_stop(sdata, true);
679 	wiphy_unlock(sdata->local->hw.wiphy);
680 
681 	return 0;
682 }
683 
684 static void ieee80211_set_multicast_list(struct net_device *dev)
685 {
686 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
687 	struct ieee80211_local *local = sdata->local;
688 	int allmulti, sdata_allmulti;
689 
690 	allmulti = !!(dev->flags & IFF_ALLMULTI);
691 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
692 
693 	if (allmulti != sdata_allmulti) {
694 		if (dev->flags & IFF_ALLMULTI)
695 			atomic_inc(&local->iff_allmultis);
696 		else
697 			atomic_dec(&local->iff_allmultis);
698 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
699 	}
700 
701 	spin_lock_bh(&local->filter_lock);
702 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
703 	spin_unlock_bh(&local->filter_lock);
704 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
705 }
706 
707 /*
708  * Called when the netdev is removed or, by the code below, before
709  * the interface type changes.
710  */
711 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
712 {
713 	/* free extra data */
714 	ieee80211_free_keys(sdata, false);
715 
716 	ieee80211_debugfs_remove_netdev(sdata);
717 
718 	ieee80211_destroy_frag_cache(&sdata->frags);
719 
720 	if (ieee80211_vif_is_mesh(&sdata->vif))
721 		ieee80211_mesh_teardown_sdata(sdata);
722 }
723 
724 static void ieee80211_uninit(struct net_device *dev)
725 {
726 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
727 }
728 
729 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
730 					 struct sk_buff *skb,
731 					 struct net_device *sb_dev)
732 {
733 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
734 }
735 
736 static void
737 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
738 {
739 	dev_fetch_sw_netstats(stats, dev->tstats);
740 }
741 
742 static const struct net_device_ops ieee80211_dataif_ops = {
743 	.ndo_open		= ieee80211_open,
744 	.ndo_stop		= ieee80211_stop,
745 	.ndo_uninit		= ieee80211_uninit,
746 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
747 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
748 	.ndo_set_mac_address 	= ieee80211_change_mac,
749 	.ndo_select_queue	= ieee80211_netdev_select_queue,
750 	.ndo_get_stats64	= ieee80211_get_stats64,
751 };
752 
753 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
754 					  struct sk_buff *skb,
755 					  struct net_device *sb_dev)
756 {
757 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
758 	struct ieee80211_local *local = sdata->local;
759 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
760 	struct ieee80211_hdr *hdr;
761 	int len_rthdr;
762 
763 	if (local->hw.queues < IEEE80211_NUM_ACS)
764 		return 0;
765 
766 	/* reset flags and info before parsing radiotap header */
767 	memset(info, 0, sizeof(*info));
768 
769 	if (!ieee80211_parse_tx_radiotap(skb, dev))
770 		return 0; /* doesn't matter, frame will be dropped */
771 
772 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
773 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
774 	if (skb->len < len_rthdr + 2 ||
775 	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
776 		return 0; /* doesn't matter, frame will be dropped */
777 
778 	return ieee80211_select_queue_80211(sdata, skb, hdr);
779 }
780 
781 static const struct net_device_ops ieee80211_monitorif_ops = {
782 	.ndo_open		= ieee80211_open,
783 	.ndo_stop		= ieee80211_stop,
784 	.ndo_uninit		= ieee80211_uninit,
785 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
786 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
787 	.ndo_set_mac_address 	= ieee80211_change_mac,
788 	.ndo_select_queue	= ieee80211_monitor_select_queue,
789 	.ndo_get_stats64	= ieee80211_get_stats64,
790 };
791 
792 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
793 					      struct net_device_path *path)
794 {
795 	struct ieee80211_sub_if_data *sdata;
796 	struct ieee80211_local *local;
797 	struct sta_info *sta;
798 	int ret = -ENOENT;
799 
800 	sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
801 	local = sdata->local;
802 
803 	if (!local->ops->net_fill_forward_path)
804 		return -EOPNOTSUPP;
805 
806 	rcu_read_lock();
807 	switch (sdata->vif.type) {
808 	case NL80211_IFTYPE_AP_VLAN:
809 		sta = rcu_dereference(sdata->u.vlan.sta);
810 		if (sta)
811 			break;
812 		if (sdata->wdev.use_4addr)
813 			goto out;
814 		if (is_multicast_ether_addr(ctx->daddr))
815 			goto out;
816 		sta = sta_info_get_bss(sdata, ctx->daddr);
817 		break;
818 	case NL80211_IFTYPE_AP:
819 		if (is_multicast_ether_addr(ctx->daddr))
820 			goto out;
821 		sta = sta_info_get(sdata, ctx->daddr);
822 		break;
823 	case NL80211_IFTYPE_STATION:
824 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
825 			sta = sta_info_get(sdata, ctx->daddr);
826 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
827 				if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
828 					goto out;
829 
830 				break;
831 			}
832 		}
833 
834 		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
835 		break;
836 	default:
837 		goto out;
838 	}
839 
840 	if (!sta)
841 		goto out;
842 
843 	ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
844 out:
845 	rcu_read_unlock();
846 
847 	return ret;
848 }
849 
850 static const struct net_device_ops ieee80211_dataif_8023_ops = {
851 	.ndo_open		= ieee80211_open,
852 	.ndo_stop		= ieee80211_stop,
853 	.ndo_uninit		= ieee80211_uninit,
854 	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
855 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
856 	.ndo_set_mac_address	= ieee80211_change_mac,
857 	.ndo_select_queue	= ieee80211_netdev_select_queue,
858 	.ndo_get_stats64	= ieee80211_get_stats64,
859 	.ndo_fill_forward_path	= ieee80211_netdev_fill_forward_path,
860 };
861 
862 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
863 {
864 	switch (iftype) {
865 	/* P2P GO and client are mapped to AP/STATION types */
866 	case NL80211_IFTYPE_AP:
867 	case NL80211_IFTYPE_STATION:
868 		return true;
869 	default:
870 		return false;
871 	}
872 }
873 
874 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
875 {
876 	struct ieee80211_local *local = sdata->local;
877 	u32 flags;
878 
879 	flags = sdata->vif.offload_flags;
880 
881 	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
882 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
883 		flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
884 
885 		if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
886 		    local->hw.wiphy->frag_threshold != (u32)-1)
887 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
888 
889 		if (local->monitors)
890 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
891 	} else {
892 		flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
893 	}
894 
895 	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
896 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
897 		flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
898 
899 		if (local->monitors &&
900 		    !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
901 			flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
902 	} else {
903 		flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
904 	}
905 
906 	if (sdata->vif.offload_flags == flags)
907 		return false;
908 
909 	sdata->vif.offload_flags = flags;
910 	ieee80211_check_fast_rx_iface(sdata);
911 	return true;
912 }
913 
914 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
915 {
916 	struct ieee80211_local *local = sdata->local;
917 	struct ieee80211_sub_if_data *bss = sdata;
918 	bool enabled;
919 
920 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 		if (!sdata->bss)
922 			return;
923 
924 		bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
925 	}
926 
927 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
928 	    !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
929 		return;
930 
931 	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
932 	if (sdata->wdev.use_4addr &&
933 	    !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
934 		enabled = false;
935 
936 	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
937 					   &ieee80211_dataif_ops;
938 }
939 
940 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
941 {
942 	struct ieee80211_local *local = sdata->local;
943 	struct ieee80211_sub_if_data *vsdata;
944 
945 	if (ieee80211_set_sdata_offload_flags(sdata)) {
946 		drv_update_vif_offload(local, sdata);
947 		ieee80211_set_vif_encap_ops(sdata);
948 	}
949 
950 	list_for_each_entry(vsdata, &local->interfaces, list) {
951 		if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
952 		    vsdata->bss != &sdata->u.ap)
953 			continue;
954 
955 		ieee80211_set_vif_encap_ops(vsdata);
956 	}
957 }
958 
959 void ieee80211_recalc_offload(struct ieee80211_local *local)
960 {
961 	struct ieee80211_sub_if_data *sdata;
962 
963 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
964 		return;
965 
966 	mutex_lock(&local->iflist_mtx);
967 
968 	list_for_each_entry(sdata, &local->interfaces, list) {
969 		if (!ieee80211_sdata_running(sdata))
970 			continue;
971 
972 		ieee80211_recalc_sdata_offload(sdata);
973 	}
974 
975 	mutex_unlock(&local->iflist_mtx);
976 }
977 
978 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
979 				    const int offset)
980 {
981 	struct ieee80211_local *local = sdata->local;
982 	u32 flags = sdata->u.mntr.flags;
983 
984 #define ADJUST(_f, _s)	do {					\
985 	if (flags & MONITOR_FLAG_##_f)				\
986 		local->fif_##_s += offset;			\
987 	} while (0)
988 
989 	ADJUST(FCSFAIL, fcsfail);
990 	ADJUST(PLCPFAIL, plcpfail);
991 	ADJUST(CONTROL, control);
992 	ADJUST(CONTROL, pspoll);
993 	ADJUST(OTHER_BSS, other_bss);
994 
995 #undef ADJUST
996 }
997 
998 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
999 {
1000 	struct ieee80211_local *local = sdata->local;
1001 	int i;
1002 
1003 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1004 		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1005 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1006 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
1007 			sdata->vif.hw_queue[i] = i;
1008 		else
1009 			sdata->vif.hw_queue[i] = 0;
1010 	}
1011 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1012 }
1013 
1014 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1015 {
1016 	struct ieee80211_sub_if_data *sdata;
1017 	int ret;
1018 
1019 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1020 		return 0;
1021 
1022 	ASSERT_RTNL();
1023 	lockdep_assert_wiphy(local->hw.wiphy);
1024 
1025 	if (local->monitor_sdata)
1026 		return 0;
1027 
1028 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1029 	if (!sdata)
1030 		return -ENOMEM;
1031 
1032 	/* set up data */
1033 	sdata->local = local;
1034 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
1035 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1036 		 wiphy_name(local->hw.wiphy));
1037 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1038 
1039 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1040 
1041 	ieee80211_set_default_queues(sdata);
1042 
1043 	ret = drv_add_interface(local, sdata);
1044 	if (WARN_ON(ret)) {
1045 		/* ok .. stupid driver, it asked for this! */
1046 		kfree(sdata);
1047 		return ret;
1048 	}
1049 
1050 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1051 
1052 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1053 	if (ret) {
1054 		kfree(sdata);
1055 		return ret;
1056 	}
1057 
1058 	mutex_lock(&local->iflist_mtx);
1059 	rcu_assign_pointer(local->monitor_sdata, sdata);
1060 	mutex_unlock(&local->iflist_mtx);
1061 
1062 	mutex_lock(&local->mtx);
1063 	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
1064 					IEEE80211_CHANCTX_EXCLUSIVE);
1065 	mutex_unlock(&local->mtx);
1066 	if (ret) {
1067 		mutex_lock(&local->iflist_mtx);
1068 		RCU_INIT_POINTER(local->monitor_sdata, NULL);
1069 		mutex_unlock(&local->iflist_mtx);
1070 		synchronize_net();
1071 		drv_remove_interface(local, sdata);
1072 		kfree(sdata);
1073 		return ret;
1074 	}
1075 
1076 	skb_queue_head_init(&sdata->skb_queue);
1077 	skb_queue_head_init(&sdata->status_queue);
1078 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1079 
1080 	return 0;
1081 }
1082 
1083 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1084 {
1085 	struct ieee80211_sub_if_data *sdata;
1086 
1087 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1088 		return;
1089 
1090 	ASSERT_RTNL();
1091 	lockdep_assert_wiphy(local->hw.wiphy);
1092 
1093 	mutex_lock(&local->iflist_mtx);
1094 
1095 	sdata = rcu_dereference_protected(local->monitor_sdata,
1096 					  lockdep_is_held(&local->iflist_mtx));
1097 	if (!sdata) {
1098 		mutex_unlock(&local->iflist_mtx);
1099 		return;
1100 	}
1101 
1102 	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1103 	mutex_unlock(&local->iflist_mtx);
1104 
1105 	synchronize_net();
1106 
1107 	mutex_lock(&local->mtx);
1108 	ieee80211_vif_release_channel(sdata);
1109 	mutex_unlock(&local->mtx);
1110 
1111 	drv_remove_interface(local, sdata);
1112 
1113 	kfree(sdata);
1114 }
1115 
1116 /*
1117  * NOTE: Be very careful when changing this function, it must NOT return
1118  * an error on interface type changes that have been pre-checked, so most
1119  * checks should be in ieee80211_check_concurrent_iface.
1120  */
1121 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1122 {
1123 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1124 	struct net_device *dev = wdev->netdev;
1125 	struct ieee80211_local *local = sdata->local;
1126 	u32 changed = 0;
1127 	int res;
1128 	u32 hw_reconf_flags = 0;
1129 
1130 	switch (sdata->vif.type) {
1131 	case NL80211_IFTYPE_AP_VLAN: {
1132 		struct ieee80211_sub_if_data *master;
1133 
1134 		if (!sdata->bss)
1135 			return -ENOLINK;
1136 
1137 		mutex_lock(&local->mtx);
1138 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1139 		mutex_unlock(&local->mtx);
1140 
1141 		master = container_of(sdata->bss,
1142 				      struct ieee80211_sub_if_data, u.ap);
1143 		sdata->control_port_protocol =
1144 			master->control_port_protocol;
1145 		sdata->control_port_no_encrypt =
1146 			master->control_port_no_encrypt;
1147 		sdata->control_port_over_nl80211 =
1148 			master->control_port_over_nl80211;
1149 		sdata->control_port_no_preauth =
1150 			master->control_port_no_preauth;
1151 		sdata->vif.cab_queue = master->vif.cab_queue;
1152 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1153 		       sizeof(sdata->vif.hw_queue));
1154 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1155 
1156 		mutex_lock(&local->key_mtx);
1157 		sdata->crypto_tx_tailroom_needed_cnt +=
1158 			master->crypto_tx_tailroom_needed_cnt;
1159 		mutex_unlock(&local->key_mtx);
1160 
1161 		break;
1162 		}
1163 	case NL80211_IFTYPE_AP:
1164 		sdata->bss = &sdata->u.ap;
1165 		break;
1166 	case NL80211_IFTYPE_MESH_POINT:
1167 	case NL80211_IFTYPE_STATION:
1168 	case NL80211_IFTYPE_MONITOR:
1169 	case NL80211_IFTYPE_ADHOC:
1170 	case NL80211_IFTYPE_P2P_DEVICE:
1171 	case NL80211_IFTYPE_OCB:
1172 	case NL80211_IFTYPE_NAN:
1173 		/* no special treatment */
1174 		break;
1175 	case NL80211_IFTYPE_UNSPECIFIED:
1176 	case NUM_NL80211_IFTYPES:
1177 	case NL80211_IFTYPE_P2P_CLIENT:
1178 	case NL80211_IFTYPE_P2P_GO:
1179 	case NL80211_IFTYPE_WDS:
1180 		/* cannot happen */
1181 		WARN_ON(1);
1182 		break;
1183 	}
1184 
1185 	if (local->open_count == 0) {
1186 		res = drv_start(local);
1187 		if (res)
1188 			goto err_del_bss;
1189 		/* we're brought up, everything changes */
1190 		hw_reconf_flags = ~0;
1191 		ieee80211_led_radio(local, true);
1192 		ieee80211_mod_tpt_led_trig(local,
1193 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1194 	}
1195 
1196 	/*
1197 	 * Copy the hopefully now-present MAC address to
1198 	 * this interface, if it has the special null one.
1199 	 */
1200 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
1201 		eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1202 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1203 
1204 		if (!is_valid_ether_addr(dev->dev_addr)) {
1205 			res = -EADDRNOTAVAIL;
1206 			goto err_stop;
1207 		}
1208 	}
1209 
1210 	switch (sdata->vif.type) {
1211 	case NL80211_IFTYPE_AP_VLAN:
1212 		/* no need to tell driver, but set carrier and chanctx */
1213 		if (rtnl_dereference(sdata->bss->beacon)) {
1214 			ieee80211_vif_vlan_copy_chanctx(sdata);
1215 			netif_carrier_on(dev);
1216 			ieee80211_set_vif_encap_ops(sdata);
1217 		} else {
1218 			netif_carrier_off(dev);
1219 		}
1220 		break;
1221 	case NL80211_IFTYPE_MONITOR:
1222 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1223 			local->cooked_mntrs++;
1224 			break;
1225 		}
1226 
1227 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1228 			res = drv_add_interface(local, sdata);
1229 			if (res)
1230 				goto err_stop;
1231 		} else if (local->monitors == 0 && local->open_count == 0) {
1232 			res = ieee80211_add_virtual_monitor(local);
1233 			if (res)
1234 				goto err_stop;
1235 		}
1236 
1237 		/* must be before the call to ieee80211_configure_filter */
1238 		local->monitors++;
1239 		if (local->monitors == 1) {
1240 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1241 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1242 		}
1243 
1244 		ieee80211_adjust_monitor_flags(sdata, 1);
1245 		ieee80211_configure_filter(local);
1246 		ieee80211_recalc_offload(local);
1247 		mutex_lock(&local->mtx);
1248 		ieee80211_recalc_idle(local);
1249 		mutex_unlock(&local->mtx);
1250 
1251 		netif_carrier_on(dev);
1252 		break;
1253 	default:
1254 		if (coming_up) {
1255 			ieee80211_del_virtual_monitor(local);
1256 			ieee80211_set_sdata_offload_flags(sdata);
1257 
1258 			res = drv_add_interface(local, sdata);
1259 			if (res)
1260 				goto err_stop;
1261 
1262 			ieee80211_set_vif_encap_ops(sdata);
1263 			res = ieee80211_check_queues(sdata,
1264 				ieee80211_vif_type_p2p(&sdata->vif));
1265 			if (res)
1266 				goto err_del_interface;
1267 		}
1268 
1269 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
1270 			local->fif_pspoll++;
1271 			local->fif_probe_req++;
1272 
1273 			ieee80211_configure_filter(local);
1274 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1275 			local->fif_probe_req++;
1276 		}
1277 
1278 		if (sdata->vif.probe_req_reg)
1279 			drv_config_iface_filter(local, sdata,
1280 						FIF_PROBE_REQ,
1281 						FIF_PROBE_REQ);
1282 
1283 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1284 		    sdata->vif.type != NL80211_IFTYPE_NAN)
1285 			changed |= ieee80211_reset_erp_info(sdata);
1286 		ieee80211_bss_info_change_notify(sdata, changed);
1287 
1288 		switch (sdata->vif.type) {
1289 		case NL80211_IFTYPE_STATION:
1290 		case NL80211_IFTYPE_ADHOC:
1291 		case NL80211_IFTYPE_AP:
1292 		case NL80211_IFTYPE_MESH_POINT:
1293 		case NL80211_IFTYPE_OCB:
1294 			netif_carrier_off(dev);
1295 			break;
1296 		case NL80211_IFTYPE_P2P_DEVICE:
1297 		case NL80211_IFTYPE_NAN:
1298 			break;
1299 		default:
1300 			/* not reached */
1301 			WARN_ON(1);
1302 		}
1303 
1304 		/*
1305 		 * Set default queue parameters so drivers don't
1306 		 * need to initialise the hardware if the hardware
1307 		 * doesn't start up with sane defaults.
1308 		 * Enable QoS for anything but station interfaces.
1309 		 */
1310 		ieee80211_set_wmm_default(sdata, true,
1311 			sdata->vif.type != NL80211_IFTYPE_STATION);
1312 	}
1313 
1314 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1315 
1316 	switch (sdata->vif.type) {
1317 	case NL80211_IFTYPE_P2P_DEVICE:
1318 		rcu_assign_pointer(local->p2p_sdata, sdata);
1319 		break;
1320 	case NL80211_IFTYPE_MONITOR:
1321 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1322 			break;
1323 		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1324 		break;
1325 	default:
1326 		break;
1327 	}
1328 
1329 	/*
1330 	 * set_multicast_list will be invoked by the networking core
1331 	 * which will check whether any increments here were done in
1332 	 * error and sync them down to the hardware as filter flags.
1333 	 */
1334 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1335 		atomic_inc(&local->iff_allmultis);
1336 
1337 	if (coming_up)
1338 		local->open_count++;
1339 
1340 	if (hw_reconf_flags)
1341 		ieee80211_hw_config(local, hw_reconf_flags);
1342 
1343 	ieee80211_recalc_ps(local);
1344 
1345 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1346 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1347 	    local->ops->wake_tx_queue) {
1348 		/* XXX: for AP_VLAN, actually track AP queues */
1349 		if (dev)
1350 			netif_tx_start_all_queues(dev);
1351 	} else if (dev) {
1352 		unsigned long flags;
1353 		int n_acs = IEEE80211_NUM_ACS;
1354 		int ac;
1355 
1356 		if (local->hw.queues < IEEE80211_NUM_ACS)
1357 			n_acs = 1;
1358 
1359 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1360 		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1361 		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1362 		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1363 			for (ac = 0; ac < n_acs; ac++) {
1364 				int ac_queue = sdata->vif.hw_queue[ac];
1365 
1366 				if (local->queue_stop_reasons[ac_queue] == 0 &&
1367 				    skb_queue_empty(&local->pending[ac_queue]))
1368 					netif_start_subqueue(dev, ac);
1369 			}
1370 		}
1371 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1372 	}
1373 
1374 	return 0;
1375  err_del_interface:
1376 	drv_remove_interface(local, sdata);
1377  err_stop:
1378 	if (!local->open_count)
1379 		drv_stop(local);
1380  err_del_bss:
1381 	sdata->bss = NULL;
1382 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1383 		mutex_lock(&local->mtx);
1384 		list_del(&sdata->u.vlan.list);
1385 		mutex_unlock(&local->mtx);
1386 	}
1387 	/* might already be clear but that doesn't matter */
1388 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1389 	return res;
1390 }
1391 
1392 static void ieee80211_if_free(struct net_device *dev)
1393 {
1394 	free_percpu(dev->tstats);
1395 }
1396 
1397 static void ieee80211_if_setup(struct net_device *dev)
1398 {
1399 	ether_setup(dev);
1400 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1401 	dev->netdev_ops = &ieee80211_dataif_ops;
1402 	dev->needs_free_netdev = true;
1403 	dev->priv_destructor = ieee80211_if_free;
1404 }
1405 
1406 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1407 {
1408 	ieee80211_if_setup(dev);
1409 	dev->priv_flags |= IFF_NO_QUEUE;
1410 }
1411 
1412 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1413 					struct ieee80211_sub_if_data *sdata,
1414 					struct sk_buff *skb)
1415 {
1416 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1417 
1418 	if (ieee80211_is_action(mgmt->frame_control) &&
1419 	    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1420 		struct sta_info *sta;
1421 		int len = skb->len;
1422 
1423 		mutex_lock(&local->sta_mtx);
1424 		sta = sta_info_get_bss(sdata, mgmt->sa);
1425 		if (sta) {
1426 			switch (mgmt->u.action.u.addba_req.action_code) {
1427 			case WLAN_ACTION_ADDBA_REQ:
1428 				ieee80211_process_addba_request(local, sta,
1429 								mgmt, len);
1430 				break;
1431 			case WLAN_ACTION_ADDBA_RESP:
1432 				ieee80211_process_addba_resp(local, sta,
1433 							     mgmt, len);
1434 				break;
1435 			case WLAN_ACTION_DELBA:
1436 				ieee80211_process_delba(sdata, sta,
1437 							mgmt, len);
1438 				break;
1439 			default:
1440 				WARN_ON(1);
1441 				break;
1442 			}
1443 		}
1444 		mutex_unlock(&local->sta_mtx);
1445 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1446 		   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1447 		switch (mgmt->u.action.u.vht_group_notif.action_code) {
1448 		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1449 			struct ieee80211_rx_status *status;
1450 			enum nl80211_band band;
1451 			struct sta_info *sta;
1452 			u8 opmode;
1453 
1454 			status = IEEE80211_SKB_RXCB(skb);
1455 			band = status->band;
1456 			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1457 
1458 			mutex_lock(&local->sta_mtx);
1459 			sta = sta_info_get_bss(sdata, mgmt->sa);
1460 
1461 			if (sta)
1462 				ieee80211_vht_handle_opmode(sdata, sta, opmode,
1463 							    band);
1464 
1465 			mutex_unlock(&local->sta_mtx);
1466 			break;
1467 		}
1468 		case WLAN_VHT_ACTION_GROUPID_MGMT:
1469 			ieee80211_process_mu_groups(sdata, mgmt);
1470 			break;
1471 		default:
1472 			WARN_ON(1);
1473 			break;
1474 		}
1475 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1476 		   mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1477 		switch (mgmt->u.action.u.s1g.action_code) {
1478 		case WLAN_S1G_TWT_TEARDOWN:
1479 		case WLAN_S1G_TWT_SETUP:
1480 			ieee80211_s1g_rx_twt_action(sdata, skb);
1481 			break;
1482 		default:
1483 			break;
1484 		}
1485 	} else if (ieee80211_is_ext(mgmt->frame_control)) {
1486 		if (sdata->vif.type == NL80211_IFTYPE_STATION)
1487 			ieee80211_sta_rx_queued_ext(sdata, skb);
1488 		else
1489 			WARN_ON(1);
1490 	} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1491 		struct ieee80211_hdr *hdr = (void *)mgmt;
1492 		struct sta_info *sta;
1493 
1494 		/*
1495 		 * So the frame isn't mgmt, but frame_control
1496 		 * is at the right place anyway, of course, so
1497 		 * the if statement is correct.
1498 		 *
1499 		 * Warn if we have other data frame types here,
1500 		 * they must not get here.
1501 		 */
1502 		WARN_ON(hdr->frame_control &
1503 				cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1504 		WARN_ON(!(hdr->seq_ctrl &
1505 				cpu_to_le16(IEEE80211_SCTL_FRAG)));
1506 		/*
1507 		 * This was a fragment of a frame, received while
1508 		 * a block-ack session was active. That cannot be
1509 		 * right, so terminate the session.
1510 		 */
1511 		mutex_lock(&local->sta_mtx);
1512 		sta = sta_info_get_bss(sdata, mgmt->sa);
1513 		if (sta) {
1514 			u16 tid = ieee80211_get_tid(hdr);
1515 
1516 			__ieee80211_stop_rx_ba_session(
1517 				sta, tid, WLAN_BACK_RECIPIENT,
1518 				WLAN_REASON_QSTA_REQUIRE_SETUP,
1519 				true);
1520 		}
1521 		mutex_unlock(&local->sta_mtx);
1522 	} else switch (sdata->vif.type) {
1523 	case NL80211_IFTYPE_STATION:
1524 		ieee80211_sta_rx_queued_mgmt(sdata, skb);
1525 		break;
1526 	case NL80211_IFTYPE_ADHOC:
1527 		ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1528 		break;
1529 	case NL80211_IFTYPE_MESH_POINT:
1530 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1531 			break;
1532 		ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1533 		break;
1534 	default:
1535 		WARN(1, "frame for unexpected interface type");
1536 		break;
1537 	}
1538 }
1539 
1540 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1541 					   struct sk_buff *skb)
1542 {
1543 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1544 
1545 	if (ieee80211_is_action(mgmt->frame_control) &&
1546 	    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1547 		switch (mgmt->u.action.u.s1g.action_code) {
1548 		case WLAN_S1G_TWT_TEARDOWN:
1549 		case WLAN_S1G_TWT_SETUP:
1550 			ieee80211_s1g_status_twt_action(sdata, skb);
1551 			break;
1552 		default:
1553 			break;
1554 		}
1555 	}
1556 }
1557 
1558 static void ieee80211_iface_work(struct work_struct *work)
1559 {
1560 	struct ieee80211_sub_if_data *sdata =
1561 		container_of(work, struct ieee80211_sub_if_data, work);
1562 	struct ieee80211_local *local = sdata->local;
1563 	struct sk_buff *skb;
1564 
1565 	if (!ieee80211_sdata_running(sdata))
1566 		return;
1567 
1568 	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1569 		return;
1570 
1571 	if (!ieee80211_can_run_worker(local))
1572 		return;
1573 
1574 	/* first process frames */
1575 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1576 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1577 
1578 		if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1579 			ieee80211_process_tdls_channel_switch(sdata, skb);
1580 		else
1581 			ieee80211_iface_process_skb(local, sdata, skb);
1582 
1583 		kfree_skb(skb);
1584 		kcov_remote_stop();
1585 	}
1586 
1587 	/* process status queue */
1588 	while ((skb = skb_dequeue(&sdata->status_queue))) {
1589 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1590 
1591 		ieee80211_iface_process_status(sdata, skb);
1592 		kfree_skb(skb);
1593 
1594 		kcov_remote_stop();
1595 	}
1596 
1597 	/* then other type-dependent work */
1598 	switch (sdata->vif.type) {
1599 	case NL80211_IFTYPE_STATION:
1600 		ieee80211_sta_work(sdata);
1601 		break;
1602 	case NL80211_IFTYPE_ADHOC:
1603 		ieee80211_ibss_work(sdata);
1604 		break;
1605 	case NL80211_IFTYPE_MESH_POINT:
1606 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1607 			break;
1608 		ieee80211_mesh_work(sdata);
1609 		break;
1610 	case NL80211_IFTYPE_OCB:
1611 		ieee80211_ocb_work(sdata);
1612 		break;
1613 	default:
1614 		break;
1615 	}
1616 }
1617 
1618 static void ieee80211_recalc_smps_work(struct work_struct *work)
1619 {
1620 	struct ieee80211_sub_if_data *sdata =
1621 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1622 
1623 	ieee80211_recalc_smps(sdata);
1624 }
1625 
1626 /*
1627  * Helper function to initialise an interface to a specific type.
1628  */
1629 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1630 				  enum nl80211_iftype type)
1631 {
1632 	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1633 						    0xff, 0xff, 0xff};
1634 
1635 	/* clear type-dependent union */
1636 	memset(&sdata->u, 0, sizeof(sdata->u));
1637 
1638 	/* and set some type-dependent values */
1639 	sdata->vif.type = type;
1640 	sdata->vif.p2p = false;
1641 	sdata->wdev.iftype = type;
1642 
1643 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1644 	sdata->control_port_no_encrypt = false;
1645 	sdata->control_port_over_nl80211 = false;
1646 	sdata->control_port_no_preauth = false;
1647 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1648 	sdata->vif.bss_conf.idle = true;
1649 	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1650 
1651 	sdata->noack_map = 0;
1652 
1653 	/* only monitor/p2p-device differ */
1654 	if (sdata->dev) {
1655 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1656 		sdata->dev->type = ARPHRD_ETHER;
1657 	}
1658 
1659 	skb_queue_head_init(&sdata->skb_queue);
1660 	skb_queue_head_init(&sdata->status_queue);
1661 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1662 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1663 	INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1664 	INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
1665 	INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1666 	INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1667 
1668 	switch (type) {
1669 	case NL80211_IFTYPE_P2P_GO:
1670 		type = NL80211_IFTYPE_AP;
1671 		sdata->vif.type = type;
1672 		sdata->vif.p2p = true;
1673 		fallthrough;
1674 	case NL80211_IFTYPE_AP:
1675 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1676 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1677 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1678 		break;
1679 	case NL80211_IFTYPE_P2P_CLIENT:
1680 		type = NL80211_IFTYPE_STATION;
1681 		sdata->vif.type = type;
1682 		sdata->vif.p2p = true;
1683 		fallthrough;
1684 	case NL80211_IFTYPE_STATION:
1685 		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1686 		ieee80211_sta_setup_sdata(sdata);
1687 		break;
1688 	case NL80211_IFTYPE_OCB:
1689 		sdata->vif.bss_conf.bssid = bssid_wildcard;
1690 		ieee80211_ocb_setup_sdata(sdata);
1691 		break;
1692 	case NL80211_IFTYPE_ADHOC:
1693 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1694 		ieee80211_ibss_setup_sdata(sdata);
1695 		break;
1696 	case NL80211_IFTYPE_MESH_POINT:
1697 		if (ieee80211_vif_is_mesh(&sdata->vif))
1698 			ieee80211_mesh_init_sdata(sdata);
1699 		break;
1700 	case NL80211_IFTYPE_MONITOR:
1701 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1702 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1703 		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1704 				      MONITOR_FLAG_OTHER_BSS;
1705 		break;
1706 	case NL80211_IFTYPE_NAN:
1707 		idr_init(&sdata->u.nan.function_inst_ids);
1708 		spin_lock_init(&sdata->u.nan.func_lock);
1709 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1710 		break;
1711 	case NL80211_IFTYPE_AP_VLAN:
1712 	case NL80211_IFTYPE_P2P_DEVICE:
1713 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1714 		break;
1715 	case NL80211_IFTYPE_UNSPECIFIED:
1716 	case NL80211_IFTYPE_WDS:
1717 	case NUM_NL80211_IFTYPES:
1718 		WARN_ON(1);
1719 		break;
1720 	}
1721 
1722 	ieee80211_debugfs_add_netdev(sdata);
1723 }
1724 
1725 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1726 					   enum nl80211_iftype type)
1727 {
1728 	struct ieee80211_local *local = sdata->local;
1729 	int ret, err;
1730 	enum nl80211_iftype internal_type = type;
1731 	bool p2p = false;
1732 
1733 	ASSERT_RTNL();
1734 
1735 	if (!local->ops->change_interface)
1736 		return -EBUSY;
1737 
1738 	switch (sdata->vif.type) {
1739 	case NL80211_IFTYPE_AP:
1740 		if (!list_empty(&sdata->u.ap.vlans))
1741 			return -EBUSY;
1742 		break;
1743 	case NL80211_IFTYPE_STATION:
1744 	case NL80211_IFTYPE_ADHOC:
1745 	case NL80211_IFTYPE_OCB:
1746 		/*
1747 		 * Could maybe also all others here?
1748 		 * Just not sure how that interacts
1749 		 * with the RX/config path e.g. for
1750 		 * mesh.
1751 		 */
1752 		break;
1753 	default:
1754 		return -EBUSY;
1755 	}
1756 
1757 	switch (type) {
1758 	case NL80211_IFTYPE_AP:
1759 	case NL80211_IFTYPE_STATION:
1760 	case NL80211_IFTYPE_ADHOC:
1761 	case NL80211_IFTYPE_OCB:
1762 		/*
1763 		 * Could probably support everything
1764 		 * but here.
1765 		 */
1766 		break;
1767 	case NL80211_IFTYPE_P2P_CLIENT:
1768 		p2p = true;
1769 		internal_type = NL80211_IFTYPE_STATION;
1770 		break;
1771 	case NL80211_IFTYPE_P2P_GO:
1772 		p2p = true;
1773 		internal_type = NL80211_IFTYPE_AP;
1774 		break;
1775 	default:
1776 		return -EBUSY;
1777 	}
1778 
1779 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1780 	if (ret)
1781 		return ret;
1782 
1783 	ieee80211_stop_vif_queues(local, sdata,
1784 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1785 	synchronize_net();
1786 
1787 	ieee80211_do_stop(sdata, false);
1788 
1789 	ieee80211_teardown_sdata(sdata);
1790 
1791 	ieee80211_set_sdata_offload_flags(sdata);
1792 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1793 	if (ret)
1794 		type = ieee80211_vif_type_p2p(&sdata->vif);
1795 
1796 	/*
1797 	 * Ignore return value here, there's not much we can do since
1798 	 * the driver changed the interface type internally already.
1799 	 * The warnings will hopefully make driver authors fix it :-)
1800 	 */
1801 	ieee80211_check_queues(sdata, type);
1802 
1803 	ieee80211_setup_sdata(sdata, type);
1804 	ieee80211_set_vif_encap_ops(sdata);
1805 
1806 	err = ieee80211_do_open(&sdata->wdev, false);
1807 	WARN(err, "type change: do_open returned %d", err);
1808 
1809 	ieee80211_wake_vif_queues(local, sdata,
1810 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1811 	return ret;
1812 }
1813 
1814 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1815 			     enum nl80211_iftype type)
1816 {
1817 	int ret;
1818 
1819 	ASSERT_RTNL();
1820 
1821 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1822 		return 0;
1823 
1824 	if (ieee80211_sdata_running(sdata)) {
1825 		ret = ieee80211_runtime_change_iftype(sdata, type);
1826 		if (ret)
1827 			return ret;
1828 	} else {
1829 		/* Purge and reset type-dependent state. */
1830 		ieee80211_teardown_sdata(sdata);
1831 		ieee80211_setup_sdata(sdata, type);
1832 	}
1833 
1834 	/* reset some values that shouldn't be kept across type changes */
1835 	if (type == NL80211_IFTYPE_STATION)
1836 		sdata->u.mgd.use_4addr = false;
1837 
1838 	return 0;
1839 }
1840 
1841 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1842 				       u8 *perm_addr, enum nl80211_iftype type)
1843 {
1844 	struct ieee80211_sub_if_data *sdata;
1845 	u64 mask, start, addr, val, inc;
1846 	u8 *m;
1847 	u8 tmp_addr[ETH_ALEN];
1848 	int i;
1849 
1850 	/* default ... something at least */
1851 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1852 
1853 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1854 	    local->hw.wiphy->n_addresses <= 1)
1855 		return;
1856 
1857 	mutex_lock(&local->iflist_mtx);
1858 
1859 	switch (type) {
1860 	case NL80211_IFTYPE_MONITOR:
1861 		/* doesn't matter */
1862 		break;
1863 	case NL80211_IFTYPE_AP_VLAN:
1864 		/* match up with an AP interface */
1865 		list_for_each_entry(sdata, &local->interfaces, list) {
1866 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1867 				continue;
1868 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1869 			break;
1870 		}
1871 		/* keep default if no AP interface present */
1872 		break;
1873 	case NL80211_IFTYPE_P2P_CLIENT:
1874 	case NL80211_IFTYPE_P2P_GO:
1875 		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1876 			list_for_each_entry(sdata, &local->interfaces, list) {
1877 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1878 					continue;
1879 				if (!ieee80211_sdata_running(sdata))
1880 					continue;
1881 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1882 				goto out_unlock;
1883 			}
1884 		}
1885 		fallthrough;
1886 	default:
1887 		/* assign a new address if possible -- try n_addresses first */
1888 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1889 			bool used = false;
1890 
1891 			list_for_each_entry(sdata, &local->interfaces, list) {
1892 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1893 						     sdata->vif.addr)) {
1894 					used = true;
1895 					break;
1896 				}
1897 			}
1898 
1899 			if (!used) {
1900 				memcpy(perm_addr,
1901 				       local->hw.wiphy->addresses[i].addr,
1902 				       ETH_ALEN);
1903 				break;
1904 			}
1905 		}
1906 
1907 		/* try mask if available */
1908 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1909 			break;
1910 
1911 		m = local->hw.wiphy->addr_mask;
1912 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1913 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1914 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1915 
1916 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1917 			/* not a contiguous mask ... not handled now! */
1918 			pr_info("not contiguous\n");
1919 			break;
1920 		}
1921 
1922 		/*
1923 		 * Pick address of existing interface in case user changed
1924 		 * MAC address manually, default to perm_addr.
1925 		 */
1926 		m = local->hw.wiphy->perm_addr;
1927 		list_for_each_entry(sdata, &local->interfaces, list) {
1928 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1929 				continue;
1930 			m = sdata->vif.addr;
1931 			break;
1932 		}
1933 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1934 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1935 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1936 
1937 		inc = 1ULL<<__ffs64(mask);
1938 		val = (start & mask);
1939 		addr = (start & ~mask) | (val & mask);
1940 		do {
1941 			bool used = false;
1942 
1943 			tmp_addr[5] = addr >> 0*8;
1944 			tmp_addr[4] = addr >> 1*8;
1945 			tmp_addr[3] = addr >> 2*8;
1946 			tmp_addr[2] = addr >> 3*8;
1947 			tmp_addr[1] = addr >> 4*8;
1948 			tmp_addr[0] = addr >> 5*8;
1949 
1950 			val += inc;
1951 
1952 			list_for_each_entry(sdata, &local->interfaces, list) {
1953 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1954 					used = true;
1955 					break;
1956 				}
1957 			}
1958 
1959 			if (!used) {
1960 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1961 				break;
1962 			}
1963 			addr = (start & ~mask) | (val & mask);
1964 		} while (addr != start);
1965 
1966 		break;
1967 	}
1968 
1969  out_unlock:
1970 	mutex_unlock(&local->iflist_mtx);
1971 }
1972 
1973 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1974 		     unsigned char name_assign_type,
1975 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1976 		     struct vif_params *params)
1977 {
1978 	struct net_device *ndev = NULL;
1979 	struct ieee80211_sub_if_data *sdata = NULL;
1980 	struct txq_info *txqi;
1981 	void (*if_setup)(struct net_device *dev);
1982 	int ret, i;
1983 	int txqs = 1;
1984 
1985 	ASSERT_RTNL();
1986 
1987 	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1988 		struct wireless_dev *wdev;
1989 
1990 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1991 				GFP_KERNEL);
1992 		if (!sdata)
1993 			return -ENOMEM;
1994 		wdev = &sdata->wdev;
1995 
1996 		sdata->dev = NULL;
1997 		strlcpy(sdata->name, name, IFNAMSIZ);
1998 		ieee80211_assign_perm_addr(local, wdev->address, type);
1999 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2000 	} else {
2001 		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2002 				 sizeof(void *));
2003 		int txq_size = 0;
2004 
2005 		if (local->ops->wake_tx_queue &&
2006 		    type != NL80211_IFTYPE_AP_VLAN &&
2007 		    (type != NL80211_IFTYPE_MONITOR ||
2008 		     (params->flags & MONITOR_FLAG_ACTIVE)))
2009 			txq_size += sizeof(struct txq_info) +
2010 				    local->hw.txq_data_size;
2011 
2012 		if (local->ops->wake_tx_queue) {
2013 			if_setup = ieee80211_if_setup_no_queue;
2014 		} else {
2015 			if_setup = ieee80211_if_setup;
2016 			if (local->hw.queues >= IEEE80211_NUM_ACS)
2017 				txqs = IEEE80211_NUM_ACS;
2018 		}
2019 
2020 		ndev = alloc_netdev_mqs(size + txq_size,
2021 					name, name_assign_type,
2022 					if_setup, txqs, 1);
2023 		if (!ndev)
2024 			return -ENOMEM;
2025 
2026 		if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2027 			ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2028 
2029 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2030 
2031 		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2032 		if (!ndev->tstats) {
2033 			free_netdev(ndev);
2034 			return -ENOMEM;
2035 		}
2036 
2037 		ndev->needed_headroom = local->tx_headroom +
2038 					4*6 /* four MAC addresses */
2039 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2040 					+ 6 /* mesh */
2041 					+ 8 /* rfc1042/bridge tunnel */
2042 					- ETH_HLEN /* ethernet hard_header_len */
2043 					+ IEEE80211_ENCRYPT_HEADROOM;
2044 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2045 
2046 		ret = dev_alloc_name(ndev, ndev->name);
2047 		if (ret < 0) {
2048 			ieee80211_if_free(ndev);
2049 			free_netdev(ndev);
2050 			return ret;
2051 		}
2052 
2053 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2054 		if (is_valid_ether_addr(params->macaddr))
2055 			eth_hw_addr_set(ndev, params->macaddr);
2056 		else
2057 			eth_hw_addr_set(ndev, ndev->perm_addr);
2058 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2059 
2060 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2061 		sdata = netdev_priv(ndev);
2062 		ndev->ieee80211_ptr = &sdata->wdev;
2063 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2064 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
2065 
2066 		if (txq_size) {
2067 			txqi = netdev_priv(ndev) + size;
2068 			ieee80211_txq_init(sdata, NULL, txqi, 0);
2069 		}
2070 
2071 		sdata->dev = ndev;
2072 	}
2073 
2074 	/* initialise type-independent data */
2075 	sdata->wdev.wiphy = local->hw.wiphy;
2076 	sdata->local = local;
2077 
2078 	ieee80211_init_frag_cache(&sdata->frags);
2079 
2080 	INIT_LIST_HEAD(&sdata->key_list);
2081 
2082 	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
2083 			  ieee80211_dfs_cac_timer_work);
2084 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2085 			  ieee80211_delayed_tailroom_dec);
2086 
2087 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
2088 		struct ieee80211_supported_band *sband;
2089 		sband = local->hw.wiphy->bands[i];
2090 		sdata->rc_rateidx_mask[i] =
2091 			sband ? (1 << sband->n_bitrates) - 1 : 0;
2092 		if (sband) {
2093 			__le16 cap;
2094 			u16 *vht_rate_mask;
2095 
2096 			memcpy(sdata->rc_rateidx_mcs_mask[i],
2097 			       sband->ht_cap.mcs.rx_mask,
2098 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2099 
2100 			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2101 			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2102 			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2103 		} else {
2104 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
2105 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2106 			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2107 			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2108 		}
2109 	}
2110 
2111 	for (i = 0; i < IEEE80211_NUM_ACS; i++)
2112 		init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
2113 
2114 	ieee80211_set_default_queues(sdata);
2115 
2116 	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2117 	sdata->user_power_level = local->user_power_level;
2118 
2119 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2120 
2121 	/* setup type-dependent data */
2122 	ieee80211_setup_sdata(sdata, type);
2123 
2124 	if (ndev) {
2125 		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2126 		if (type == NL80211_IFTYPE_STATION)
2127 			sdata->u.mgd.use_4addr = params->use_4addr;
2128 
2129 		ndev->features |= local->hw.netdev_features;
2130 		ndev->hw_features |= ndev->features &
2131 					MAC80211_SUPPORTED_FEATURES_TX;
2132 
2133 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2134 
2135 		/* MTU range is normally 256 - 2304, where the upper limit is
2136 		 * the maximum MSDU size. Monitor interfaces send and receive
2137 		 * MPDU and A-MSDU frames which may be much larger so we do
2138 		 * not impose an upper limit in that case.
2139 		 */
2140 		ndev->min_mtu = 256;
2141 		if (type == NL80211_IFTYPE_MONITOR)
2142 			ndev->max_mtu = 0;
2143 		else
2144 			ndev->max_mtu = local->hw.max_mtu;
2145 
2146 		ret = cfg80211_register_netdevice(ndev);
2147 		if (ret) {
2148 			free_netdev(ndev);
2149 			return ret;
2150 		}
2151 	}
2152 
2153 	mutex_lock(&local->iflist_mtx);
2154 	list_add_tail_rcu(&sdata->list, &local->interfaces);
2155 	mutex_unlock(&local->iflist_mtx);
2156 
2157 	if (new_wdev)
2158 		*new_wdev = &sdata->wdev;
2159 
2160 	return 0;
2161 }
2162 
2163 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2164 {
2165 	ASSERT_RTNL();
2166 
2167 	mutex_lock(&sdata->local->iflist_mtx);
2168 	list_del_rcu(&sdata->list);
2169 	mutex_unlock(&sdata->local->iflist_mtx);
2170 
2171 	if (sdata->vif.txq)
2172 		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2173 
2174 	synchronize_rcu();
2175 
2176 	cfg80211_unregister_wdev(&sdata->wdev);
2177 
2178 	if (!sdata->dev) {
2179 		ieee80211_teardown_sdata(sdata);
2180 		kfree(sdata);
2181 	}
2182 }
2183 
2184 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2185 {
2186 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2187 		return;
2188 	ieee80211_do_stop(sdata, true);
2189 }
2190 
2191 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2192 {
2193 	struct ieee80211_sub_if_data *sdata, *tmp;
2194 	LIST_HEAD(unreg_list);
2195 	LIST_HEAD(wdev_list);
2196 
2197 	ASSERT_RTNL();
2198 
2199 	/* Before destroying the interfaces, make sure they're all stopped so
2200 	 * that the hardware is stopped. Otherwise, the driver might still be
2201 	 * iterating the interfaces during the shutdown, e.g. from a worker
2202 	 * or from RX processing or similar, and if it does so (using atomic
2203 	 * iteration) while we're manipulating the list, the iteration will
2204 	 * crash.
2205 	 *
2206 	 * After this, the hardware should be stopped and the driver should
2207 	 * have stopped all of its activities, so that we can do RCU-unaware
2208 	 * manipulations of the interface list below.
2209 	 */
2210 	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2211 
2212 	WARN(local->open_count, "%s: open count remains %d\n",
2213 	     wiphy_name(local->hw.wiphy), local->open_count);
2214 
2215 	ieee80211_txq_teardown_flows(local);
2216 
2217 	mutex_lock(&local->iflist_mtx);
2218 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2219 		list_del(&sdata->list);
2220 
2221 		if (sdata->dev)
2222 			unregister_netdevice_queue(sdata->dev, &unreg_list);
2223 		else
2224 			list_add(&sdata->list, &wdev_list);
2225 	}
2226 	mutex_unlock(&local->iflist_mtx);
2227 
2228 	unregister_netdevice_many(&unreg_list);
2229 
2230 	wiphy_lock(local->hw.wiphy);
2231 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2232 		list_del(&sdata->list);
2233 		cfg80211_unregister_wdev(&sdata->wdev);
2234 		kfree(sdata);
2235 	}
2236 	wiphy_unlock(local->hw.wiphy);
2237 }
2238 
2239 static int netdev_notify(struct notifier_block *nb,
2240 			 unsigned long state, void *ptr)
2241 {
2242 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2243 	struct ieee80211_sub_if_data *sdata;
2244 
2245 	if (state != NETDEV_CHANGENAME)
2246 		return NOTIFY_DONE;
2247 
2248 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2249 		return NOTIFY_DONE;
2250 
2251 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2252 		return NOTIFY_DONE;
2253 
2254 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2255 	memcpy(sdata->name, dev->name, IFNAMSIZ);
2256 	ieee80211_debugfs_rename_netdev(sdata);
2257 
2258 	return NOTIFY_OK;
2259 }
2260 
2261 static struct notifier_block mac80211_netdev_notifier = {
2262 	.notifier_call = netdev_notify,
2263 };
2264 
2265 int ieee80211_iface_init(void)
2266 {
2267 	return register_netdevice_notifier(&mac80211_netdev_notifier);
2268 }
2269 
2270 void ieee80211_iface_exit(void)
2271 {
2272 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2273 }
2274 
2275 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2276 {
2277 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2278 		atomic_inc(&sdata->u.ap.num_mcast_sta);
2279 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2280 		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2281 }
2282 
2283 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2284 {
2285 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2286 		atomic_dec(&sdata->u.ap.num_mcast_sta);
2287 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2288 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2289 }
2290