xref: /openbmc/linux/net/mac80211/iface.c (revision 9659281c)
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 
466 	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
467 
468 	if (sdata->wdev.cac_started) {
469 		chandef = sdata->vif.bss_conf.chandef;
470 		WARN_ON(local->suspended);
471 		mutex_lock(&local->mtx);
472 		ieee80211_vif_release_channel(sdata);
473 		mutex_unlock(&local->mtx);
474 		cfg80211_cac_event(sdata->dev, &chandef,
475 				   NL80211_RADAR_CAC_ABORTED,
476 				   GFP_KERNEL);
477 	}
478 
479 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
480 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
481 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
482 		/* remove all packets in parent bc_buf pointing to this dev */
483 		ps = &sdata->bss->ps;
484 
485 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
486 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
487 			if (skb->dev == sdata->dev) {
488 				__skb_unlink(skb, &ps->bc_buf);
489 				local->total_ps_buffered--;
490 				ieee80211_free_txskb(&local->hw, skb);
491 			}
492 		}
493 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
494 	}
495 
496 	if (going_down)
497 		local->open_count--;
498 
499 	switch (sdata->vif.type) {
500 	case NL80211_IFTYPE_AP_VLAN:
501 		mutex_lock(&local->mtx);
502 		list_del(&sdata->u.vlan.list);
503 		mutex_unlock(&local->mtx);
504 		RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
505 		/* see comment in the default case below */
506 		ieee80211_free_keys(sdata, true);
507 		/* no need to tell driver */
508 		break;
509 	case NL80211_IFTYPE_MONITOR:
510 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
511 			local->cooked_mntrs--;
512 			break;
513 		}
514 
515 		local->monitors--;
516 		if (local->monitors == 0) {
517 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
518 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
519 		}
520 
521 		ieee80211_adjust_monitor_flags(sdata, -1);
522 		break;
523 	case NL80211_IFTYPE_NAN:
524 		/* clean all the functions */
525 		spin_lock_bh(&sdata->u.nan.func_lock);
526 
527 		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
528 			idr_remove(&sdata->u.nan.function_inst_ids, i);
529 			cfg80211_free_nan_func(func);
530 		}
531 		idr_destroy(&sdata->u.nan.function_inst_ids);
532 
533 		spin_unlock_bh(&sdata->u.nan.func_lock);
534 		break;
535 	case NL80211_IFTYPE_P2P_DEVICE:
536 		/* relies on synchronize_rcu() below */
537 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
538 		fallthrough;
539 	default:
540 		cancel_work_sync(&sdata->work);
541 		/*
542 		 * When we get here, the interface is marked down.
543 		 * Free the remaining keys, if there are any
544 		 * (which can happen in AP mode if userspace sets
545 		 * keys before the interface is operating)
546 		 *
547 		 * Force the key freeing to always synchronize_net()
548 		 * to wait for the RX path in case it is using this
549 		 * interface enqueuing frames at this very time on
550 		 * another CPU.
551 		 */
552 		ieee80211_free_keys(sdata, true);
553 		skb_queue_purge(&sdata->skb_queue);
554 	}
555 
556 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
557 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
558 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
559 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
560 			if (info->control.vif == &sdata->vif) {
561 				__skb_unlink(skb, &local->pending[i]);
562 				ieee80211_free_txskb(&local->hw, skb);
563 			}
564 		}
565 	}
566 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
567 
568 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
569 		ieee80211_txq_remove_vlan(local, sdata);
570 
571 	sdata->bss = NULL;
572 
573 	if (local->open_count == 0)
574 		ieee80211_clear_tx_pending(local);
575 
576 	sdata->vif.bss_conf.beacon_int = 0;
577 
578 	/*
579 	 * If the interface goes down while suspended, presumably because
580 	 * the device was unplugged and that happens before our resume,
581 	 * then the driver is already unconfigured and the remainder of
582 	 * this function isn't needed.
583 	 * XXX: what about WoWLAN? If the device has software state, e.g.
584 	 *	memory allocated, it might expect teardown commands from
585 	 *	mac80211 here?
586 	 */
587 	if (local->suspended) {
588 		WARN_ON(local->wowlan);
589 		WARN_ON(rtnl_dereference(local->monitor_sdata));
590 		return;
591 	}
592 
593 	switch (sdata->vif.type) {
594 	case NL80211_IFTYPE_AP_VLAN:
595 		break;
596 	case NL80211_IFTYPE_MONITOR:
597 		if (local->monitors == 0)
598 			ieee80211_del_virtual_monitor(local);
599 
600 		mutex_lock(&local->mtx);
601 		ieee80211_recalc_idle(local);
602 		mutex_unlock(&local->mtx);
603 
604 		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
605 			break;
606 
607 		fallthrough;
608 	default:
609 		if (going_down)
610 			drv_remove_interface(local, sdata);
611 	}
612 
613 	ieee80211_recalc_ps(local);
614 
615 	if (cancel_scan)
616 		flush_delayed_work(&local->scan_work);
617 
618 	if (local->open_count == 0) {
619 		ieee80211_stop_device(local);
620 
621 		/* no reconfiguring after stop! */
622 		return;
623 	}
624 
625 	/* do after stop to avoid reconfiguring when we stop anyway */
626 	ieee80211_configure_filter(local);
627 	ieee80211_hw_config(local, hw_reconf_flags);
628 
629 	if (local->monitors == local->open_count)
630 		ieee80211_add_virtual_monitor(local);
631 }
632 
633 static int ieee80211_stop(struct net_device *dev)
634 {
635 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
636 
637 	/* close all dependent VLAN interfaces before locking wiphy */
638 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
639 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
640 
641 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
642 					 u.vlan.list)
643 			dev_close(vlan->dev);
644 	}
645 
646 	wiphy_lock(sdata->local->hw.wiphy);
647 	ieee80211_do_stop(sdata, true);
648 	wiphy_unlock(sdata->local->hw.wiphy);
649 
650 	return 0;
651 }
652 
653 static void ieee80211_set_multicast_list(struct net_device *dev)
654 {
655 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
656 	struct ieee80211_local *local = sdata->local;
657 	int allmulti, sdata_allmulti;
658 
659 	allmulti = !!(dev->flags & IFF_ALLMULTI);
660 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
661 
662 	if (allmulti != sdata_allmulti) {
663 		if (dev->flags & IFF_ALLMULTI)
664 			atomic_inc(&local->iff_allmultis);
665 		else
666 			atomic_dec(&local->iff_allmultis);
667 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
668 	}
669 
670 	spin_lock_bh(&local->filter_lock);
671 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
672 	spin_unlock_bh(&local->filter_lock);
673 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
674 }
675 
676 /*
677  * Called when the netdev is removed or, by the code below, before
678  * the interface type changes.
679  */
680 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
681 {
682 	/* free extra data */
683 	ieee80211_free_keys(sdata, false);
684 
685 	ieee80211_debugfs_remove_netdev(sdata);
686 
687 	ieee80211_destroy_frag_cache(&sdata->frags);
688 
689 	if (ieee80211_vif_is_mesh(&sdata->vif))
690 		ieee80211_mesh_teardown_sdata(sdata);
691 }
692 
693 static void ieee80211_uninit(struct net_device *dev)
694 {
695 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
696 }
697 
698 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
699 					 struct sk_buff *skb,
700 					 struct net_device *sb_dev)
701 {
702 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
703 }
704 
705 static void
706 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
707 {
708 	dev_fetch_sw_netstats(stats, dev->tstats);
709 }
710 
711 static const struct net_device_ops ieee80211_dataif_ops = {
712 	.ndo_open		= ieee80211_open,
713 	.ndo_stop		= ieee80211_stop,
714 	.ndo_uninit		= ieee80211_uninit,
715 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
716 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
717 	.ndo_set_mac_address 	= ieee80211_change_mac,
718 	.ndo_select_queue	= ieee80211_netdev_select_queue,
719 	.ndo_get_stats64	= ieee80211_get_stats64,
720 };
721 
722 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
723 					  struct sk_buff *skb,
724 					  struct net_device *sb_dev)
725 {
726 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
727 	struct ieee80211_local *local = sdata->local;
728 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
729 	struct ieee80211_hdr *hdr;
730 	int len_rthdr;
731 
732 	if (local->hw.queues < IEEE80211_NUM_ACS)
733 		return 0;
734 
735 	/* reset flags and info before parsing radiotap header */
736 	memset(info, 0, sizeof(*info));
737 
738 	if (!ieee80211_parse_tx_radiotap(skb, dev))
739 		return 0; /* doesn't matter, frame will be dropped */
740 
741 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
742 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
743 	if (skb->len < len_rthdr + 2 ||
744 	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
745 		return 0; /* doesn't matter, frame will be dropped */
746 
747 	return ieee80211_select_queue_80211(sdata, skb, hdr);
748 }
749 
750 static const struct net_device_ops ieee80211_monitorif_ops = {
751 	.ndo_open		= ieee80211_open,
752 	.ndo_stop		= ieee80211_stop,
753 	.ndo_uninit		= ieee80211_uninit,
754 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
755 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
756 	.ndo_set_mac_address 	= ieee80211_change_mac,
757 	.ndo_select_queue	= ieee80211_monitor_select_queue,
758 	.ndo_get_stats64	= ieee80211_get_stats64,
759 };
760 
761 static const struct net_device_ops ieee80211_dataif_8023_ops = {
762 	.ndo_open		= ieee80211_open,
763 	.ndo_stop		= ieee80211_stop,
764 	.ndo_uninit		= ieee80211_uninit,
765 	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
766 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
767 	.ndo_set_mac_address	= ieee80211_change_mac,
768 	.ndo_select_queue	= ieee80211_netdev_select_queue,
769 	.ndo_get_stats64	= ieee80211_get_stats64,
770 };
771 
772 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
773 {
774 	switch (iftype) {
775 	/* P2P GO and client are mapped to AP/STATION types */
776 	case NL80211_IFTYPE_AP:
777 	case NL80211_IFTYPE_STATION:
778 		return true;
779 	default:
780 		return false;
781 	}
782 }
783 
784 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
785 {
786 	struct ieee80211_local *local = sdata->local;
787 	u32 flags;
788 
789 	flags = sdata->vif.offload_flags;
790 
791 	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
792 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
793 		flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
794 
795 		if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
796 		    local->hw.wiphy->frag_threshold != (u32)-1)
797 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
798 
799 		if (local->monitors)
800 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
801 	} else {
802 		flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
803 	}
804 
805 	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
806 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
807 		flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
808 
809 		if (local->monitors &&
810 		    !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
811 			flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
812 	} else {
813 		flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
814 	}
815 
816 	if (sdata->vif.offload_flags == flags)
817 		return false;
818 
819 	sdata->vif.offload_flags = flags;
820 	ieee80211_check_fast_rx_iface(sdata);
821 	return true;
822 }
823 
824 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
825 {
826 	struct ieee80211_local *local = sdata->local;
827 	struct ieee80211_sub_if_data *bss = sdata;
828 	bool enabled;
829 
830 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
831 		if (!sdata->bss)
832 			return;
833 
834 		bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
835 	}
836 
837 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
838 	    !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
839 		return;
840 
841 	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
842 	if (sdata->wdev.use_4addr &&
843 	    !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
844 		enabled = false;
845 
846 	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
847 					   &ieee80211_dataif_ops;
848 }
849 
850 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
851 {
852 	struct ieee80211_local *local = sdata->local;
853 	struct ieee80211_sub_if_data *vsdata;
854 
855 	if (ieee80211_set_sdata_offload_flags(sdata)) {
856 		drv_update_vif_offload(local, sdata);
857 		ieee80211_set_vif_encap_ops(sdata);
858 	}
859 
860 	list_for_each_entry(vsdata, &local->interfaces, list) {
861 		if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
862 		    vsdata->bss != &sdata->u.ap)
863 			continue;
864 
865 		ieee80211_set_vif_encap_ops(vsdata);
866 	}
867 }
868 
869 void ieee80211_recalc_offload(struct ieee80211_local *local)
870 {
871 	struct ieee80211_sub_if_data *sdata;
872 
873 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
874 		return;
875 
876 	mutex_lock(&local->iflist_mtx);
877 
878 	list_for_each_entry(sdata, &local->interfaces, list) {
879 		if (!ieee80211_sdata_running(sdata))
880 			continue;
881 
882 		ieee80211_recalc_sdata_offload(sdata);
883 	}
884 
885 	mutex_unlock(&local->iflist_mtx);
886 }
887 
888 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
889 				    const int offset)
890 {
891 	struct ieee80211_local *local = sdata->local;
892 	u32 flags = sdata->u.mntr.flags;
893 
894 #define ADJUST(_f, _s)	do {					\
895 	if (flags & MONITOR_FLAG_##_f)				\
896 		local->fif_##_s += offset;			\
897 	} while (0)
898 
899 	ADJUST(FCSFAIL, fcsfail);
900 	ADJUST(PLCPFAIL, plcpfail);
901 	ADJUST(CONTROL, control);
902 	ADJUST(CONTROL, pspoll);
903 	ADJUST(OTHER_BSS, other_bss);
904 
905 #undef ADJUST
906 }
907 
908 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
909 {
910 	struct ieee80211_local *local = sdata->local;
911 	int i;
912 
913 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
914 		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
915 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
916 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
917 			sdata->vif.hw_queue[i] = i;
918 		else
919 			sdata->vif.hw_queue[i] = 0;
920 	}
921 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
922 }
923 
924 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
925 {
926 	struct ieee80211_sub_if_data *sdata;
927 	int ret;
928 
929 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
930 		return 0;
931 
932 	ASSERT_RTNL();
933 
934 	if (local->monitor_sdata)
935 		return 0;
936 
937 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
938 	if (!sdata)
939 		return -ENOMEM;
940 
941 	/* set up data */
942 	sdata->local = local;
943 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
944 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
945 		 wiphy_name(local->hw.wiphy));
946 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
947 
948 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
949 
950 	ieee80211_set_default_queues(sdata);
951 
952 	ret = drv_add_interface(local, sdata);
953 	if (WARN_ON(ret)) {
954 		/* ok .. stupid driver, it asked for this! */
955 		kfree(sdata);
956 		return ret;
957 	}
958 
959 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
960 
961 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
962 	if (ret) {
963 		kfree(sdata);
964 		return ret;
965 	}
966 
967 	mutex_lock(&local->iflist_mtx);
968 	rcu_assign_pointer(local->monitor_sdata, sdata);
969 	mutex_unlock(&local->iflist_mtx);
970 
971 	mutex_lock(&local->mtx);
972 	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
973 					IEEE80211_CHANCTX_EXCLUSIVE);
974 	mutex_unlock(&local->mtx);
975 	if (ret) {
976 		mutex_lock(&local->iflist_mtx);
977 		RCU_INIT_POINTER(local->monitor_sdata, NULL);
978 		mutex_unlock(&local->iflist_mtx);
979 		synchronize_net();
980 		drv_remove_interface(local, sdata);
981 		kfree(sdata);
982 		return ret;
983 	}
984 
985 	skb_queue_head_init(&sdata->skb_queue);
986 	INIT_WORK(&sdata->work, ieee80211_iface_work);
987 
988 	return 0;
989 }
990 
991 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
992 {
993 	struct ieee80211_sub_if_data *sdata;
994 
995 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
996 		return;
997 
998 	ASSERT_RTNL();
999 
1000 	mutex_lock(&local->iflist_mtx);
1001 
1002 	sdata = rcu_dereference_protected(local->monitor_sdata,
1003 					  lockdep_is_held(&local->iflist_mtx));
1004 	if (!sdata) {
1005 		mutex_unlock(&local->iflist_mtx);
1006 		return;
1007 	}
1008 
1009 	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1010 	mutex_unlock(&local->iflist_mtx);
1011 
1012 	synchronize_net();
1013 
1014 	mutex_lock(&local->mtx);
1015 	ieee80211_vif_release_channel(sdata);
1016 	mutex_unlock(&local->mtx);
1017 
1018 	drv_remove_interface(local, sdata);
1019 
1020 	kfree(sdata);
1021 }
1022 
1023 /*
1024  * NOTE: Be very careful when changing this function, it must NOT return
1025  * an error on interface type changes that have been pre-checked, so most
1026  * checks should be in ieee80211_check_concurrent_iface.
1027  */
1028 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1029 {
1030 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1031 	struct net_device *dev = wdev->netdev;
1032 	struct ieee80211_local *local = sdata->local;
1033 	u32 changed = 0;
1034 	int res;
1035 	u32 hw_reconf_flags = 0;
1036 
1037 	switch (sdata->vif.type) {
1038 	case NL80211_IFTYPE_AP_VLAN: {
1039 		struct ieee80211_sub_if_data *master;
1040 
1041 		if (!sdata->bss)
1042 			return -ENOLINK;
1043 
1044 		mutex_lock(&local->mtx);
1045 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1046 		mutex_unlock(&local->mtx);
1047 
1048 		master = container_of(sdata->bss,
1049 				      struct ieee80211_sub_if_data, u.ap);
1050 		sdata->control_port_protocol =
1051 			master->control_port_protocol;
1052 		sdata->control_port_no_encrypt =
1053 			master->control_port_no_encrypt;
1054 		sdata->control_port_over_nl80211 =
1055 			master->control_port_over_nl80211;
1056 		sdata->control_port_no_preauth =
1057 			master->control_port_no_preauth;
1058 		sdata->vif.cab_queue = master->vif.cab_queue;
1059 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1060 		       sizeof(sdata->vif.hw_queue));
1061 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1062 
1063 		mutex_lock(&local->key_mtx);
1064 		sdata->crypto_tx_tailroom_needed_cnt +=
1065 			master->crypto_tx_tailroom_needed_cnt;
1066 		mutex_unlock(&local->key_mtx);
1067 
1068 		break;
1069 		}
1070 	case NL80211_IFTYPE_AP:
1071 		sdata->bss = &sdata->u.ap;
1072 		break;
1073 	case NL80211_IFTYPE_MESH_POINT:
1074 	case NL80211_IFTYPE_STATION:
1075 	case NL80211_IFTYPE_MONITOR:
1076 	case NL80211_IFTYPE_ADHOC:
1077 	case NL80211_IFTYPE_P2P_DEVICE:
1078 	case NL80211_IFTYPE_OCB:
1079 	case NL80211_IFTYPE_NAN:
1080 		/* no special treatment */
1081 		break;
1082 	case NL80211_IFTYPE_UNSPECIFIED:
1083 	case NUM_NL80211_IFTYPES:
1084 	case NL80211_IFTYPE_P2P_CLIENT:
1085 	case NL80211_IFTYPE_P2P_GO:
1086 	case NL80211_IFTYPE_WDS:
1087 		/* cannot happen */
1088 		WARN_ON(1);
1089 		break;
1090 	}
1091 
1092 	if (local->open_count == 0) {
1093 		res = drv_start(local);
1094 		if (res)
1095 			goto err_del_bss;
1096 		/* we're brought up, everything changes */
1097 		hw_reconf_flags = ~0;
1098 		ieee80211_led_radio(local, true);
1099 		ieee80211_mod_tpt_led_trig(local,
1100 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1101 	}
1102 
1103 	/*
1104 	 * Copy the hopefully now-present MAC address to
1105 	 * this interface, if it has the special null one.
1106 	 */
1107 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
1108 		memcpy(dev->dev_addr,
1109 		       local->hw.wiphy->perm_addr,
1110 		       ETH_ALEN);
1111 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1112 
1113 		if (!is_valid_ether_addr(dev->dev_addr)) {
1114 			res = -EADDRNOTAVAIL;
1115 			goto err_stop;
1116 		}
1117 	}
1118 
1119 	switch (sdata->vif.type) {
1120 	case NL80211_IFTYPE_AP_VLAN:
1121 		/* no need to tell driver, but set carrier and chanctx */
1122 		if (rtnl_dereference(sdata->bss->beacon)) {
1123 			ieee80211_vif_vlan_copy_chanctx(sdata);
1124 			netif_carrier_on(dev);
1125 			ieee80211_set_vif_encap_ops(sdata);
1126 		} else {
1127 			netif_carrier_off(dev);
1128 		}
1129 		break;
1130 	case NL80211_IFTYPE_MONITOR:
1131 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1132 			local->cooked_mntrs++;
1133 			break;
1134 		}
1135 
1136 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1137 			res = drv_add_interface(local, sdata);
1138 			if (res)
1139 				goto err_stop;
1140 		} else if (local->monitors == 0 && local->open_count == 0) {
1141 			res = ieee80211_add_virtual_monitor(local);
1142 			if (res)
1143 				goto err_stop;
1144 		}
1145 
1146 		/* must be before the call to ieee80211_configure_filter */
1147 		local->monitors++;
1148 		if (local->monitors == 1) {
1149 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1150 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1151 		}
1152 
1153 		ieee80211_adjust_monitor_flags(sdata, 1);
1154 		ieee80211_configure_filter(local);
1155 		ieee80211_recalc_offload(local);
1156 		mutex_lock(&local->mtx);
1157 		ieee80211_recalc_idle(local);
1158 		mutex_unlock(&local->mtx);
1159 
1160 		netif_carrier_on(dev);
1161 		break;
1162 	default:
1163 		if (coming_up) {
1164 			ieee80211_del_virtual_monitor(local);
1165 			ieee80211_set_sdata_offload_flags(sdata);
1166 
1167 			res = drv_add_interface(local, sdata);
1168 			if (res)
1169 				goto err_stop;
1170 
1171 			ieee80211_set_vif_encap_ops(sdata);
1172 			res = ieee80211_check_queues(sdata,
1173 				ieee80211_vif_type_p2p(&sdata->vif));
1174 			if (res)
1175 				goto err_del_interface;
1176 		}
1177 
1178 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
1179 			local->fif_pspoll++;
1180 			local->fif_probe_req++;
1181 
1182 			ieee80211_configure_filter(local);
1183 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1184 			local->fif_probe_req++;
1185 		}
1186 
1187 		if (sdata->vif.probe_req_reg)
1188 			drv_config_iface_filter(local, sdata,
1189 						FIF_PROBE_REQ,
1190 						FIF_PROBE_REQ);
1191 
1192 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1193 		    sdata->vif.type != NL80211_IFTYPE_NAN)
1194 			changed |= ieee80211_reset_erp_info(sdata);
1195 		ieee80211_bss_info_change_notify(sdata, changed);
1196 
1197 		switch (sdata->vif.type) {
1198 		case NL80211_IFTYPE_STATION:
1199 		case NL80211_IFTYPE_ADHOC:
1200 		case NL80211_IFTYPE_AP:
1201 		case NL80211_IFTYPE_MESH_POINT:
1202 		case NL80211_IFTYPE_OCB:
1203 			netif_carrier_off(dev);
1204 			break;
1205 		case NL80211_IFTYPE_P2P_DEVICE:
1206 		case NL80211_IFTYPE_NAN:
1207 			break;
1208 		default:
1209 			/* not reached */
1210 			WARN_ON(1);
1211 		}
1212 
1213 		/*
1214 		 * Set default queue parameters so drivers don't
1215 		 * need to initialise the hardware if the hardware
1216 		 * doesn't start up with sane defaults.
1217 		 * Enable QoS for anything but station interfaces.
1218 		 */
1219 		ieee80211_set_wmm_default(sdata, true,
1220 			sdata->vif.type != NL80211_IFTYPE_STATION);
1221 	}
1222 
1223 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1224 
1225 	switch (sdata->vif.type) {
1226 	case NL80211_IFTYPE_P2P_DEVICE:
1227 		rcu_assign_pointer(local->p2p_sdata, sdata);
1228 		break;
1229 	case NL80211_IFTYPE_MONITOR:
1230 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1231 			break;
1232 		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1233 		break;
1234 	default:
1235 		break;
1236 	}
1237 
1238 	/*
1239 	 * set_multicast_list will be invoked by the networking core
1240 	 * which will check whether any increments here were done in
1241 	 * error and sync them down to the hardware as filter flags.
1242 	 */
1243 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1244 		atomic_inc(&local->iff_allmultis);
1245 
1246 	if (coming_up)
1247 		local->open_count++;
1248 
1249 	if (hw_reconf_flags)
1250 		ieee80211_hw_config(local, hw_reconf_flags);
1251 
1252 	ieee80211_recalc_ps(local);
1253 
1254 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1255 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1256 	    local->ops->wake_tx_queue) {
1257 		/* XXX: for AP_VLAN, actually track AP queues */
1258 		if (dev)
1259 			netif_tx_start_all_queues(dev);
1260 	} else if (dev) {
1261 		unsigned long flags;
1262 		int n_acs = IEEE80211_NUM_ACS;
1263 		int ac;
1264 
1265 		if (local->hw.queues < IEEE80211_NUM_ACS)
1266 			n_acs = 1;
1267 
1268 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1269 		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1270 		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1271 		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1272 			for (ac = 0; ac < n_acs; ac++) {
1273 				int ac_queue = sdata->vif.hw_queue[ac];
1274 
1275 				if (local->queue_stop_reasons[ac_queue] == 0 &&
1276 				    skb_queue_empty(&local->pending[ac_queue]))
1277 					netif_start_subqueue(dev, ac);
1278 			}
1279 		}
1280 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1281 	}
1282 
1283 	return 0;
1284  err_del_interface:
1285 	drv_remove_interface(local, sdata);
1286  err_stop:
1287 	if (!local->open_count)
1288 		drv_stop(local);
1289  err_del_bss:
1290 	sdata->bss = NULL;
1291 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1292 		mutex_lock(&local->mtx);
1293 		list_del(&sdata->u.vlan.list);
1294 		mutex_unlock(&local->mtx);
1295 	}
1296 	/* might already be clear but that doesn't matter */
1297 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1298 	return res;
1299 }
1300 
1301 static void ieee80211_if_free(struct net_device *dev)
1302 {
1303 	free_percpu(dev->tstats);
1304 }
1305 
1306 static void ieee80211_if_setup(struct net_device *dev)
1307 {
1308 	ether_setup(dev);
1309 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1310 	dev->netdev_ops = &ieee80211_dataif_ops;
1311 	dev->needs_free_netdev = true;
1312 	dev->priv_destructor = ieee80211_if_free;
1313 }
1314 
1315 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1316 {
1317 	ieee80211_if_setup(dev);
1318 	dev->priv_flags |= IFF_NO_QUEUE;
1319 }
1320 
1321 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1322 					struct ieee80211_sub_if_data *sdata,
1323 					struct sk_buff *skb)
1324 {
1325 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1326 
1327 	if (ieee80211_is_action(mgmt->frame_control) &&
1328 	    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1329 		struct sta_info *sta;
1330 		int len = skb->len;
1331 
1332 		mutex_lock(&local->sta_mtx);
1333 		sta = sta_info_get_bss(sdata, mgmt->sa);
1334 		if (sta) {
1335 			switch (mgmt->u.action.u.addba_req.action_code) {
1336 			case WLAN_ACTION_ADDBA_REQ:
1337 				ieee80211_process_addba_request(local, sta,
1338 								mgmt, len);
1339 				break;
1340 			case WLAN_ACTION_ADDBA_RESP:
1341 				ieee80211_process_addba_resp(local, sta,
1342 							     mgmt, len);
1343 				break;
1344 			case WLAN_ACTION_DELBA:
1345 				ieee80211_process_delba(sdata, sta,
1346 							mgmt, len);
1347 				break;
1348 			default:
1349 				WARN_ON(1);
1350 				break;
1351 			}
1352 		}
1353 		mutex_unlock(&local->sta_mtx);
1354 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1355 		   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1356 		switch (mgmt->u.action.u.vht_group_notif.action_code) {
1357 		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1358 			struct ieee80211_rx_status *status;
1359 			enum nl80211_band band;
1360 			struct sta_info *sta;
1361 			u8 opmode;
1362 
1363 			status = IEEE80211_SKB_RXCB(skb);
1364 			band = status->band;
1365 			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1366 
1367 			mutex_lock(&local->sta_mtx);
1368 			sta = sta_info_get_bss(sdata, mgmt->sa);
1369 
1370 			if (sta)
1371 				ieee80211_vht_handle_opmode(sdata, sta, opmode,
1372 							    band);
1373 
1374 			mutex_unlock(&local->sta_mtx);
1375 			break;
1376 		}
1377 		case WLAN_VHT_ACTION_GROUPID_MGMT:
1378 			ieee80211_process_mu_groups(sdata, mgmt);
1379 			break;
1380 		default:
1381 			WARN_ON(1);
1382 			break;
1383 		}
1384 	} else if (ieee80211_is_ext(mgmt->frame_control)) {
1385 		if (sdata->vif.type == NL80211_IFTYPE_STATION)
1386 			ieee80211_sta_rx_queued_ext(sdata, skb);
1387 		else
1388 			WARN_ON(1);
1389 	} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1390 		struct ieee80211_hdr *hdr = (void *)mgmt;
1391 		struct sta_info *sta;
1392 
1393 		/*
1394 		 * So the frame isn't mgmt, but frame_control
1395 		 * is at the right place anyway, of course, so
1396 		 * the if statement is correct.
1397 		 *
1398 		 * Warn if we have other data frame types here,
1399 		 * they must not get here.
1400 		 */
1401 		WARN_ON(hdr->frame_control &
1402 				cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1403 		WARN_ON(!(hdr->seq_ctrl &
1404 				cpu_to_le16(IEEE80211_SCTL_FRAG)));
1405 		/*
1406 		 * This was a fragment of a frame, received while
1407 		 * a block-ack session was active. That cannot be
1408 		 * right, so terminate the session.
1409 		 */
1410 		mutex_lock(&local->sta_mtx);
1411 		sta = sta_info_get_bss(sdata, mgmt->sa);
1412 		if (sta) {
1413 			u16 tid = ieee80211_get_tid(hdr);
1414 
1415 			__ieee80211_stop_rx_ba_session(
1416 				sta, tid, WLAN_BACK_RECIPIENT,
1417 				WLAN_REASON_QSTA_REQUIRE_SETUP,
1418 				true);
1419 		}
1420 		mutex_unlock(&local->sta_mtx);
1421 	} else switch (sdata->vif.type) {
1422 	case NL80211_IFTYPE_STATION:
1423 		ieee80211_sta_rx_queued_mgmt(sdata, skb);
1424 		break;
1425 	case NL80211_IFTYPE_ADHOC:
1426 		ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1427 		break;
1428 	case NL80211_IFTYPE_MESH_POINT:
1429 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1430 			break;
1431 		ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1432 		break;
1433 	default:
1434 		WARN(1, "frame for unexpected interface type");
1435 		break;
1436 	}
1437 }
1438 
1439 static void ieee80211_iface_work(struct work_struct *work)
1440 {
1441 	struct ieee80211_sub_if_data *sdata =
1442 		container_of(work, struct ieee80211_sub_if_data, work);
1443 	struct ieee80211_local *local = sdata->local;
1444 	struct sk_buff *skb;
1445 
1446 	if (!ieee80211_sdata_running(sdata))
1447 		return;
1448 
1449 	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1450 		return;
1451 
1452 	if (!ieee80211_can_run_worker(local))
1453 		return;
1454 
1455 	/* first process frames */
1456 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1457 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1458 
1459 		if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1460 			ieee80211_process_tdls_channel_switch(sdata, skb);
1461 		else
1462 			ieee80211_iface_process_skb(local, sdata, skb);
1463 
1464 		kfree_skb(skb);
1465 		kcov_remote_stop();
1466 	}
1467 
1468 	/* then other type-dependent work */
1469 	switch (sdata->vif.type) {
1470 	case NL80211_IFTYPE_STATION:
1471 		ieee80211_sta_work(sdata);
1472 		break;
1473 	case NL80211_IFTYPE_ADHOC:
1474 		ieee80211_ibss_work(sdata);
1475 		break;
1476 	case NL80211_IFTYPE_MESH_POINT:
1477 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1478 			break;
1479 		ieee80211_mesh_work(sdata);
1480 		break;
1481 	case NL80211_IFTYPE_OCB:
1482 		ieee80211_ocb_work(sdata);
1483 		break;
1484 	default:
1485 		break;
1486 	}
1487 }
1488 
1489 static void ieee80211_recalc_smps_work(struct work_struct *work)
1490 {
1491 	struct ieee80211_sub_if_data *sdata =
1492 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1493 
1494 	ieee80211_recalc_smps(sdata);
1495 }
1496 
1497 /*
1498  * Helper function to initialise an interface to a specific type.
1499  */
1500 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1501 				  enum nl80211_iftype type)
1502 {
1503 	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1504 						    0xff, 0xff, 0xff};
1505 
1506 	/* clear type-dependent union */
1507 	memset(&sdata->u, 0, sizeof(sdata->u));
1508 
1509 	/* and set some type-dependent values */
1510 	sdata->vif.type = type;
1511 	sdata->vif.p2p = false;
1512 	sdata->wdev.iftype = type;
1513 
1514 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1515 	sdata->control_port_no_encrypt = false;
1516 	sdata->control_port_over_nl80211 = false;
1517 	sdata->control_port_no_preauth = false;
1518 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1519 	sdata->vif.bss_conf.idle = true;
1520 	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1521 
1522 	sdata->noack_map = 0;
1523 
1524 	/* only monitor/p2p-device differ */
1525 	if (sdata->dev) {
1526 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1527 		sdata->dev->type = ARPHRD_ETHER;
1528 	}
1529 
1530 	skb_queue_head_init(&sdata->skb_queue);
1531 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1532 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1533 	INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1534 	INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1535 	INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1536 
1537 	switch (type) {
1538 	case NL80211_IFTYPE_P2P_GO:
1539 		type = NL80211_IFTYPE_AP;
1540 		sdata->vif.type = type;
1541 		sdata->vif.p2p = true;
1542 		fallthrough;
1543 	case NL80211_IFTYPE_AP:
1544 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1545 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1546 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1547 		break;
1548 	case NL80211_IFTYPE_P2P_CLIENT:
1549 		type = NL80211_IFTYPE_STATION;
1550 		sdata->vif.type = type;
1551 		sdata->vif.p2p = true;
1552 		fallthrough;
1553 	case NL80211_IFTYPE_STATION:
1554 		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1555 		ieee80211_sta_setup_sdata(sdata);
1556 		break;
1557 	case NL80211_IFTYPE_OCB:
1558 		sdata->vif.bss_conf.bssid = bssid_wildcard;
1559 		ieee80211_ocb_setup_sdata(sdata);
1560 		break;
1561 	case NL80211_IFTYPE_ADHOC:
1562 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1563 		ieee80211_ibss_setup_sdata(sdata);
1564 		break;
1565 	case NL80211_IFTYPE_MESH_POINT:
1566 		if (ieee80211_vif_is_mesh(&sdata->vif))
1567 			ieee80211_mesh_init_sdata(sdata);
1568 		break;
1569 	case NL80211_IFTYPE_MONITOR:
1570 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1571 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1572 		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1573 				      MONITOR_FLAG_OTHER_BSS;
1574 		break;
1575 	case NL80211_IFTYPE_NAN:
1576 		idr_init(&sdata->u.nan.function_inst_ids);
1577 		spin_lock_init(&sdata->u.nan.func_lock);
1578 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1579 		break;
1580 	case NL80211_IFTYPE_AP_VLAN:
1581 	case NL80211_IFTYPE_P2P_DEVICE:
1582 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1583 		break;
1584 	case NL80211_IFTYPE_UNSPECIFIED:
1585 	case NL80211_IFTYPE_WDS:
1586 	case NUM_NL80211_IFTYPES:
1587 		WARN_ON(1);
1588 		break;
1589 	}
1590 
1591 	ieee80211_debugfs_add_netdev(sdata);
1592 }
1593 
1594 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1595 					   enum nl80211_iftype type)
1596 {
1597 	struct ieee80211_local *local = sdata->local;
1598 	int ret, err;
1599 	enum nl80211_iftype internal_type = type;
1600 	bool p2p = false;
1601 
1602 	ASSERT_RTNL();
1603 
1604 	if (!local->ops->change_interface)
1605 		return -EBUSY;
1606 
1607 	switch (sdata->vif.type) {
1608 	case NL80211_IFTYPE_AP:
1609 		if (!list_empty(&sdata->u.ap.vlans))
1610 			return -EBUSY;
1611 		break;
1612 	case NL80211_IFTYPE_STATION:
1613 	case NL80211_IFTYPE_ADHOC:
1614 	case NL80211_IFTYPE_OCB:
1615 		/*
1616 		 * Could maybe also all others here?
1617 		 * Just not sure how that interacts
1618 		 * with the RX/config path e.g. for
1619 		 * mesh.
1620 		 */
1621 		break;
1622 	default:
1623 		return -EBUSY;
1624 	}
1625 
1626 	switch (type) {
1627 	case NL80211_IFTYPE_AP:
1628 	case NL80211_IFTYPE_STATION:
1629 	case NL80211_IFTYPE_ADHOC:
1630 	case NL80211_IFTYPE_OCB:
1631 		/*
1632 		 * Could probably support everything
1633 		 * but here.
1634 		 */
1635 		break;
1636 	case NL80211_IFTYPE_P2P_CLIENT:
1637 		p2p = true;
1638 		internal_type = NL80211_IFTYPE_STATION;
1639 		break;
1640 	case NL80211_IFTYPE_P2P_GO:
1641 		p2p = true;
1642 		internal_type = NL80211_IFTYPE_AP;
1643 		break;
1644 	default:
1645 		return -EBUSY;
1646 	}
1647 
1648 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1649 	if (ret)
1650 		return ret;
1651 
1652 	ieee80211_stop_vif_queues(local, sdata,
1653 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1654 	synchronize_net();
1655 
1656 	ieee80211_do_stop(sdata, false);
1657 
1658 	ieee80211_teardown_sdata(sdata);
1659 
1660 	ieee80211_set_sdata_offload_flags(sdata);
1661 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1662 	if (ret)
1663 		type = ieee80211_vif_type_p2p(&sdata->vif);
1664 
1665 	/*
1666 	 * Ignore return value here, there's not much we can do since
1667 	 * the driver changed the interface type internally already.
1668 	 * The warnings will hopefully make driver authors fix it :-)
1669 	 */
1670 	ieee80211_check_queues(sdata, type);
1671 
1672 	ieee80211_setup_sdata(sdata, type);
1673 	ieee80211_set_vif_encap_ops(sdata);
1674 
1675 	err = ieee80211_do_open(&sdata->wdev, false);
1676 	WARN(err, "type change: do_open returned %d", err);
1677 
1678 	ieee80211_wake_vif_queues(local, sdata,
1679 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1680 	return ret;
1681 }
1682 
1683 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1684 			     enum nl80211_iftype type)
1685 {
1686 	int ret;
1687 
1688 	ASSERT_RTNL();
1689 
1690 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1691 		return 0;
1692 
1693 	if (ieee80211_sdata_running(sdata)) {
1694 		ret = ieee80211_runtime_change_iftype(sdata, type);
1695 		if (ret)
1696 			return ret;
1697 	} else {
1698 		/* Purge and reset type-dependent state. */
1699 		ieee80211_teardown_sdata(sdata);
1700 		ieee80211_setup_sdata(sdata, type);
1701 	}
1702 
1703 	/* reset some values that shouldn't be kept across type changes */
1704 	if (type == NL80211_IFTYPE_STATION)
1705 		sdata->u.mgd.use_4addr = false;
1706 
1707 	return 0;
1708 }
1709 
1710 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1711 				       u8 *perm_addr, enum nl80211_iftype type)
1712 {
1713 	struct ieee80211_sub_if_data *sdata;
1714 	u64 mask, start, addr, val, inc;
1715 	u8 *m;
1716 	u8 tmp_addr[ETH_ALEN];
1717 	int i;
1718 
1719 	/* default ... something at least */
1720 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1721 
1722 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1723 	    local->hw.wiphy->n_addresses <= 1)
1724 		return;
1725 
1726 	mutex_lock(&local->iflist_mtx);
1727 
1728 	switch (type) {
1729 	case NL80211_IFTYPE_MONITOR:
1730 		/* doesn't matter */
1731 		break;
1732 	case NL80211_IFTYPE_AP_VLAN:
1733 		/* match up with an AP interface */
1734 		list_for_each_entry(sdata, &local->interfaces, list) {
1735 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1736 				continue;
1737 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1738 			break;
1739 		}
1740 		/* keep default if no AP interface present */
1741 		break;
1742 	case NL80211_IFTYPE_P2P_CLIENT:
1743 	case NL80211_IFTYPE_P2P_GO:
1744 		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1745 			list_for_each_entry(sdata, &local->interfaces, list) {
1746 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1747 					continue;
1748 				if (!ieee80211_sdata_running(sdata))
1749 					continue;
1750 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1751 				goto out_unlock;
1752 			}
1753 		}
1754 		fallthrough;
1755 	default:
1756 		/* assign a new address if possible -- try n_addresses first */
1757 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1758 			bool used = false;
1759 
1760 			list_for_each_entry(sdata, &local->interfaces, list) {
1761 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1762 						     sdata->vif.addr)) {
1763 					used = true;
1764 					break;
1765 				}
1766 			}
1767 
1768 			if (!used) {
1769 				memcpy(perm_addr,
1770 				       local->hw.wiphy->addresses[i].addr,
1771 				       ETH_ALEN);
1772 				break;
1773 			}
1774 		}
1775 
1776 		/* try mask if available */
1777 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1778 			break;
1779 
1780 		m = local->hw.wiphy->addr_mask;
1781 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1782 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1783 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1784 
1785 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1786 			/* not a contiguous mask ... not handled now! */
1787 			pr_info("not contiguous\n");
1788 			break;
1789 		}
1790 
1791 		/*
1792 		 * Pick address of existing interface in case user changed
1793 		 * MAC address manually, default to perm_addr.
1794 		 */
1795 		m = local->hw.wiphy->perm_addr;
1796 		list_for_each_entry(sdata, &local->interfaces, list) {
1797 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1798 				continue;
1799 			m = sdata->vif.addr;
1800 			break;
1801 		}
1802 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1803 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1804 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1805 
1806 		inc = 1ULL<<__ffs64(mask);
1807 		val = (start & mask);
1808 		addr = (start & ~mask) | (val & mask);
1809 		do {
1810 			bool used = false;
1811 
1812 			tmp_addr[5] = addr >> 0*8;
1813 			tmp_addr[4] = addr >> 1*8;
1814 			tmp_addr[3] = addr >> 2*8;
1815 			tmp_addr[2] = addr >> 3*8;
1816 			tmp_addr[1] = addr >> 4*8;
1817 			tmp_addr[0] = addr >> 5*8;
1818 
1819 			val += inc;
1820 
1821 			list_for_each_entry(sdata, &local->interfaces, list) {
1822 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1823 					used = true;
1824 					break;
1825 				}
1826 			}
1827 
1828 			if (!used) {
1829 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1830 				break;
1831 			}
1832 			addr = (start & ~mask) | (val & mask);
1833 		} while (addr != start);
1834 
1835 		break;
1836 	}
1837 
1838  out_unlock:
1839 	mutex_unlock(&local->iflist_mtx);
1840 }
1841 
1842 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1843 		     unsigned char name_assign_type,
1844 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1845 		     struct vif_params *params)
1846 {
1847 	struct net_device *ndev = NULL;
1848 	struct ieee80211_sub_if_data *sdata = NULL;
1849 	struct txq_info *txqi;
1850 	void (*if_setup)(struct net_device *dev);
1851 	int ret, i;
1852 	int txqs = 1;
1853 
1854 	ASSERT_RTNL();
1855 
1856 	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1857 		struct wireless_dev *wdev;
1858 
1859 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1860 				GFP_KERNEL);
1861 		if (!sdata)
1862 			return -ENOMEM;
1863 		wdev = &sdata->wdev;
1864 
1865 		sdata->dev = NULL;
1866 		strlcpy(sdata->name, name, IFNAMSIZ);
1867 		ieee80211_assign_perm_addr(local, wdev->address, type);
1868 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1869 	} else {
1870 		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1871 				 sizeof(void *));
1872 		int txq_size = 0;
1873 
1874 		if (local->ops->wake_tx_queue &&
1875 		    type != NL80211_IFTYPE_AP_VLAN &&
1876 		    (type != NL80211_IFTYPE_MONITOR ||
1877 		     (params->flags & MONITOR_FLAG_ACTIVE)))
1878 			txq_size += sizeof(struct txq_info) +
1879 				    local->hw.txq_data_size;
1880 
1881 		if (local->ops->wake_tx_queue) {
1882 			if_setup = ieee80211_if_setup_no_queue;
1883 		} else {
1884 			if_setup = ieee80211_if_setup;
1885 			if (local->hw.queues >= IEEE80211_NUM_ACS)
1886 				txqs = IEEE80211_NUM_ACS;
1887 		}
1888 
1889 		ndev = alloc_netdev_mqs(size + txq_size,
1890 					name, name_assign_type,
1891 					if_setup, txqs, 1);
1892 		if (!ndev)
1893 			return -ENOMEM;
1894 
1895 		if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1896 			ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1897 
1898 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1899 
1900 		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1901 		if (!ndev->tstats) {
1902 			free_netdev(ndev);
1903 			return -ENOMEM;
1904 		}
1905 
1906 		ndev->needed_headroom = local->tx_headroom +
1907 					4*6 /* four MAC addresses */
1908 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1909 					+ 6 /* mesh */
1910 					+ 8 /* rfc1042/bridge tunnel */
1911 					- ETH_HLEN /* ethernet hard_header_len */
1912 					+ IEEE80211_ENCRYPT_HEADROOM;
1913 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1914 
1915 		ret = dev_alloc_name(ndev, ndev->name);
1916 		if (ret < 0) {
1917 			ieee80211_if_free(ndev);
1918 			free_netdev(ndev);
1919 			return ret;
1920 		}
1921 
1922 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1923 		if (is_valid_ether_addr(params->macaddr))
1924 			memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1925 		else
1926 			memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1927 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1928 
1929 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1930 		sdata = netdev_priv(ndev);
1931 		ndev->ieee80211_ptr = &sdata->wdev;
1932 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1933 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
1934 
1935 		if (txq_size) {
1936 			txqi = netdev_priv(ndev) + size;
1937 			ieee80211_txq_init(sdata, NULL, txqi, 0);
1938 		}
1939 
1940 		sdata->dev = ndev;
1941 	}
1942 
1943 	/* initialise type-independent data */
1944 	sdata->wdev.wiphy = local->hw.wiphy;
1945 	sdata->local = local;
1946 
1947 	ieee80211_init_frag_cache(&sdata->frags);
1948 
1949 	INIT_LIST_HEAD(&sdata->key_list);
1950 
1951 	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1952 			  ieee80211_dfs_cac_timer_work);
1953 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1954 			  ieee80211_delayed_tailroom_dec);
1955 
1956 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
1957 		struct ieee80211_supported_band *sband;
1958 		sband = local->hw.wiphy->bands[i];
1959 		sdata->rc_rateidx_mask[i] =
1960 			sband ? (1 << sband->n_bitrates) - 1 : 0;
1961 		if (sband) {
1962 			__le16 cap;
1963 			u16 *vht_rate_mask;
1964 
1965 			memcpy(sdata->rc_rateidx_mcs_mask[i],
1966 			       sband->ht_cap.mcs.rx_mask,
1967 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1968 
1969 			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1970 			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1971 			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1972 		} else {
1973 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
1974 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1975 			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1976 			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1977 		}
1978 	}
1979 
1980 	for (i = 0; i < IEEE80211_NUM_ACS; i++)
1981 		init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
1982 
1983 	ieee80211_set_default_queues(sdata);
1984 
1985 	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1986 	sdata->user_power_level = local->user_power_level;
1987 
1988 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1989 
1990 	/* setup type-dependent data */
1991 	ieee80211_setup_sdata(sdata, type);
1992 
1993 	if (ndev) {
1994 		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1995 		if (type == NL80211_IFTYPE_STATION)
1996 			sdata->u.mgd.use_4addr = params->use_4addr;
1997 
1998 		ndev->features |= local->hw.netdev_features;
1999 		ndev->hw_features |= ndev->features &
2000 					MAC80211_SUPPORTED_FEATURES_TX;
2001 
2002 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2003 
2004 		/* MTU range: 256 - 2304 */
2005 		ndev->min_mtu = 256;
2006 		ndev->max_mtu = local->hw.max_mtu;
2007 
2008 		ret = cfg80211_register_netdevice(ndev);
2009 		if (ret) {
2010 			free_netdev(ndev);
2011 			return ret;
2012 		}
2013 	}
2014 
2015 	mutex_lock(&local->iflist_mtx);
2016 	list_add_tail_rcu(&sdata->list, &local->interfaces);
2017 	mutex_unlock(&local->iflist_mtx);
2018 
2019 	if (new_wdev)
2020 		*new_wdev = &sdata->wdev;
2021 
2022 	return 0;
2023 }
2024 
2025 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2026 {
2027 	ASSERT_RTNL();
2028 
2029 	mutex_lock(&sdata->local->iflist_mtx);
2030 	list_del_rcu(&sdata->list);
2031 	mutex_unlock(&sdata->local->iflist_mtx);
2032 
2033 	if (sdata->vif.txq)
2034 		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2035 
2036 	synchronize_rcu();
2037 
2038 	cfg80211_unregister_wdev(&sdata->wdev);
2039 
2040 	if (!sdata->dev) {
2041 		ieee80211_teardown_sdata(sdata);
2042 		kfree(sdata);
2043 	}
2044 }
2045 
2046 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2047 {
2048 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2049 		return;
2050 	ieee80211_do_stop(sdata, true);
2051 }
2052 
2053 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2054 {
2055 	struct ieee80211_sub_if_data *sdata, *tmp;
2056 	LIST_HEAD(unreg_list);
2057 	LIST_HEAD(wdev_list);
2058 
2059 	ASSERT_RTNL();
2060 
2061 	/* Before destroying the interfaces, make sure they're all stopped so
2062 	 * that the hardware is stopped. Otherwise, the driver might still be
2063 	 * iterating the interfaces during the shutdown, e.g. from a worker
2064 	 * or from RX processing or similar, and if it does so (using atomic
2065 	 * iteration) while we're manipulating the list, the iteration will
2066 	 * crash.
2067 	 *
2068 	 * After this, the hardware should be stopped and the driver should
2069 	 * have stopped all of its activities, so that we can do RCU-unaware
2070 	 * manipulations of the interface list below.
2071 	 */
2072 	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2073 
2074 	WARN(local->open_count, "%s: open count remains %d\n",
2075 	     wiphy_name(local->hw.wiphy), local->open_count);
2076 
2077 	ieee80211_txq_teardown_flows(local);
2078 
2079 	mutex_lock(&local->iflist_mtx);
2080 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2081 		list_del(&sdata->list);
2082 
2083 		if (sdata->dev)
2084 			unregister_netdevice_queue(sdata->dev, &unreg_list);
2085 		else
2086 			list_add(&sdata->list, &wdev_list);
2087 	}
2088 	mutex_unlock(&local->iflist_mtx);
2089 
2090 	unregister_netdevice_many(&unreg_list);
2091 
2092 	wiphy_lock(local->hw.wiphy);
2093 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2094 		list_del(&sdata->list);
2095 		cfg80211_unregister_wdev(&sdata->wdev);
2096 		kfree(sdata);
2097 	}
2098 	wiphy_unlock(local->hw.wiphy);
2099 }
2100 
2101 static int netdev_notify(struct notifier_block *nb,
2102 			 unsigned long state, void *ptr)
2103 {
2104 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2105 	struct ieee80211_sub_if_data *sdata;
2106 
2107 	if (state != NETDEV_CHANGENAME)
2108 		return NOTIFY_DONE;
2109 
2110 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2111 		return NOTIFY_DONE;
2112 
2113 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2114 		return NOTIFY_DONE;
2115 
2116 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2117 	memcpy(sdata->name, dev->name, IFNAMSIZ);
2118 	ieee80211_debugfs_rename_netdev(sdata);
2119 
2120 	return NOTIFY_OK;
2121 }
2122 
2123 static struct notifier_block mac80211_netdev_notifier = {
2124 	.notifier_call = netdev_notify,
2125 };
2126 
2127 int ieee80211_iface_init(void)
2128 {
2129 	return register_netdevice_notifier(&mac80211_netdev_notifier);
2130 }
2131 
2132 void ieee80211_iface_exit(void)
2133 {
2134 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2135 }
2136 
2137 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2138 {
2139 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2140 		atomic_inc(&sdata->u.ap.num_mcast_sta);
2141 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2142 		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2143 }
2144 
2145 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2146 {
2147 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2148 		atomic_dec(&sdata->u.ap.num_mcast_sta);
2149 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2150 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2151 }
2152