xref: /openbmc/linux/net/mac80211/iface.c (revision 6c33a6f4)
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 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 <net/mac80211.h>
19 #include <net/ieee80211_radiotap.h>
20 #include "ieee80211_i.h"
21 #include "sta_info.h"
22 #include "debugfs_netdev.h"
23 #include "mesh.h"
24 #include "led.h"
25 #include "driver-ops.h"
26 #include "wme.h"
27 #include "rate.h"
28 
29 /**
30  * DOC: Interface list locking
31  *
32  * The interface list in each struct ieee80211_local is protected
33  * three-fold:
34  *
35  * (1) modifications may only be done under the RTNL
36  * (2) modifications and readers are protected against each other by
37  *     the iflist_mtx.
38  * (3) modifications are done in an RCU manner so atomic readers
39  *     can traverse the list in RCU-safe blocks.
40  *
41  * As a consequence, reads (traversals) of the list can be protected
42  * by either the RTNL, the iflist_mtx or RCU.
43  */
44 
45 static void ieee80211_iface_work(struct work_struct *work);
46 
47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
48 {
49 	struct ieee80211_chanctx_conf *chanctx_conf;
50 	int power;
51 
52 	rcu_read_lock();
53 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
54 	if (!chanctx_conf) {
55 		rcu_read_unlock();
56 		return false;
57 	}
58 
59 	power = ieee80211_chandef_max_power(&chanctx_conf->def);
60 	rcu_read_unlock();
61 
62 	if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63 		power = min(power, sdata->user_power_level);
64 
65 	if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66 		power = min(power, sdata->ap_power_level);
67 
68 	if (power != sdata->vif.bss_conf.txpower) {
69 		sdata->vif.bss_conf.txpower = power;
70 		ieee80211_hw_config(sdata->local, 0);
71 		return true;
72 	}
73 
74 	return false;
75 }
76 
77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
78 			      bool update_bss)
79 {
80 	if (__ieee80211_recalc_txpower(sdata) ||
81 	    (update_bss && ieee80211_sdata_running(sdata)))
82 		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
83 }
84 
85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
86 {
87 	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
88 		return 0;
89 
90 	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
91 	return IEEE80211_CONF_CHANGE_IDLE;
92 }
93 
94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
95 {
96 	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
97 		return 0;
98 
99 	ieee80211_flush_queues(local, NULL, false);
100 
101 	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
102 	return IEEE80211_CONF_CHANGE_IDLE;
103 }
104 
105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
106 				   bool force_active)
107 {
108 	bool working, scanning, active;
109 	unsigned int led_trig_start = 0, led_trig_stop = 0;
110 
111 	lockdep_assert_held(&local->mtx);
112 
113 	active = force_active ||
114 		 !list_empty(&local->chanctx_list) ||
115 		 local->monitors;
116 
117 	working = !local->ops->remain_on_channel &&
118 		  !list_empty(&local->roc_list);
119 
120 	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
121 		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
122 
123 	if (working || scanning)
124 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
125 	else
126 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 
128 	if (active)
129 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
130 	else
131 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 
133 	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
134 
135 	if (working || scanning || active)
136 		return __ieee80211_idle_off(local);
137 	return __ieee80211_idle_on(local);
138 }
139 
140 u32 ieee80211_idle_off(struct ieee80211_local *local)
141 {
142 	return __ieee80211_recalc_idle(local, true);
143 }
144 
145 void ieee80211_recalc_idle(struct ieee80211_local *local)
146 {
147 	u32 change = __ieee80211_recalc_idle(local, false);
148 	if (change)
149 		ieee80211_hw_config(local, change);
150 }
151 
152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
153 				bool check_dup)
154 {
155 	struct ieee80211_local *local = sdata->local;
156 	struct ieee80211_sub_if_data *iter;
157 	u64 new, mask, tmp;
158 	u8 *m;
159 	int ret = 0;
160 
161 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
162 		return 0;
163 
164 	m = addr;
165 	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
166 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
167 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
168 
169 	m = local->hw.wiphy->addr_mask;
170 	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
171 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
172 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
173 
174 	if (!check_dup)
175 		return ret;
176 
177 	mutex_lock(&local->iflist_mtx);
178 	list_for_each_entry(iter, &local->interfaces, list) {
179 		if (iter == sdata)
180 			continue;
181 
182 		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
183 		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
184 			continue;
185 
186 		m = iter->vif.addr;
187 		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
188 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
189 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
190 
191 		if ((new & ~mask) != (tmp & ~mask)) {
192 			ret = -EINVAL;
193 			break;
194 		}
195 	}
196 	mutex_unlock(&local->iflist_mtx);
197 
198 	return ret;
199 }
200 
201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
202 {
203 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
204 	struct sockaddr *sa = addr;
205 	bool check_dup = true;
206 	int ret;
207 
208 	if (ieee80211_sdata_running(sdata))
209 		return -EBUSY;
210 
211 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
212 	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
213 		check_dup = false;
214 
215 	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
216 	if (ret)
217 		return ret;
218 
219 	ret = eth_mac_addr(dev, sa);
220 
221 	if (ret == 0)
222 		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
223 
224 	return ret;
225 }
226 
227 static inline int identical_mac_addr_allowed(int type1, int type2)
228 {
229 	return type1 == NL80211_IFTYPE_MONITOR ||
230 		type2 == NL80211_IFTYPE_MONITOR ||
231 		type1 == NL80211_IFTYPE_P2P_DEVICE ||
232 		type2 == NL80211_IFTYPE_P2P_DEVICE ||
233 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
234 		(type1 == NL80211_IFTYPE_WDS &&
235 			(type2 == NL80211_IFTYPE_WDS ||
236 			 type2 == NL80211_IFTYPE_AP)) ||
237 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
238 		(type1 == NL80211_IFTYPE_AP_VLAN &&
239 			(type2 == NL80211_IFTYPE_AP ||
240 			 type2 == NL80211_IFTYPE_AP_VLAN));
241 }
242 
243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
244 					    enum nl80211_iftype iftype)
245 {
246 	struct ieee80211_local *local = sdata->local;
247 	struct ieee80211_sub_if_data *nsdata;
248 	int ret;
249 
250 	ASSERT_RTNL();
251 
252 	/* we hold the RTNL here so can safely walk the list */
253 	list_for_each_entry(nsdata, &local->interfaces, list) {
254 		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
255 			/*
256 			 * Only OCB and monitor mode may coexist
257 			 */
258 			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
259 			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
260 			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
261 			     nsdata->vif.type == NL80211_IFTYPE_OCB))
262 				return -EBUSY;
263 
264 			/*
265 			 * Allow only a single IBSS interface to be up at any
266 			 * time. This is restricted because beacon distribution
267 			 * cannot work properly if both are in the same IBSS.
268 			 *
269 			 * To remove this restriction we'd have to disallow them
270 			 * from setting the same SSID on different IBSS interfaces
271 			 * belonging to the same hardware. Then, however, we're
272 			 * faced with having to adopt two different TSF timers...
273 			 */
274 			if (iftype == NL80211_IFTYPE_ADHOC &&
275 			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
276 				return -EBUSY;
277 			/*
278 			 * will not add another interface while any channel
279 			 * switch is active.
280 			 */
281 			if (nsdata->vif.csa_active)
282 				return -EBUSY;
283 
284 			/*
285 			 * The remaining checks are only performed for interfaces
286 			 * with the same MAC address.
287 			 */
288 			if (!ether_addr_equal(sdata->vif.addr,
289 					      nsdata->vif.addr))
290 				continue;
291 
292 			/*
293 			 * check whether it may have the same address
294 			 */
295 			if (!identical_mac_addr_allowed(iftype,
296 							nsdata->vif.type))
297 				return -ENOTUNIQ;
298 
299 			/*
300 			 * can only add VLANs to enabled APs
301 			 */
302 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
303 			    nsdata->vif.type == NL80211_IFTYPE_AP)
304 				sdata->bss = &nsdata->u.ap;
305 		}
306 	}
307 
308 	mutex_lock(&local->chanctx_mtx);
309 	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
310 	mutex_unlock(&local->chanctx_mtx);
311 	return ret;
312 }
313 
314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
315 				  enum nl80211_iftype iftype)
316 {
317 	int n_queues = sdata->local->hw.queues;
318 	int i;
319 
320 	if (iftype == NL80211_IFTYPE_NAN)
321 		return 0;
322 
323 	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
324 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
325 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
326 					 IEEE80211_INVAL_HW_QUEUE))
327 				return -EINVAL;
328 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
329 					 n_queues))
330 				return -EINVAL;
331 		}
332 	}
333 
334 	if ((iftype != NL80211_IFTYPE_AP &&
335 	     iftype != NL80211_IFTYPE_P2P_GO &&
336 	     iftype != NL80211_IFTYPE_MESH_POINT) ||
337 	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
338 		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
339 		return 0;
340 	}
341 
342 	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
343 		return -EINVAL;
344 
345 	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
346 		return -EINVAL;
347 
348 	return 0;
349 }
350 
351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
352 				    const int offset)
353 {
354 	struct ieee80211_local *local = sdata->local;
355 	u32 flags = sdata->u.mntr.flags;
356 
357 #define ADJUST(_f, _s)	do {					\
358 	if (flags & MONITOR_FLAG_##_f)				\
359 		local->fif_##_s += offset;			\
360 	} while (0)
361 
362 	ADJUST(FCSFAIL, fcsfail);
363 	ADJUST(PLCPFAIL, plcpfail);
364 	ADJUST(CONTROL, control);
365 	ADJUST(CONTROL, pspoll);
366 	ADJUST(OTHER_BSS, other_bss);
367 
368 #undef ADJUST
369 }
370 
371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
372 {
373 	struct ieee80211_local *local = sdata->local;
374 	int i;
375 
376 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
377 		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
378 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
379 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
380 			sdata->vif.hw_queue[i] = i;
381 		else
382 			sdata->vif.hw_queue[i] = 0;
383 	}
384 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
385 }
386 
387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
388 {
389 	struct ieee80211_sub_if_data *sdata;
390 	int ret;
391 
392 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
393 		return 0;
394 
395 	ASSERT_RTNL();
396 
397 	if (local->monitor_sdata)
398 		return 0;
399 
400 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
401 	if (!sdata)
402 		return -ENOMEM;
403 
404 	/* set up data */
405 	sdata->local = local;
406 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
407 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
408 		 wiphy_name(local->hw.wiphy));
409 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
410 
411 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
412 
413 	ieee80211_set_default_queues(sdata);
414 
415 	ret = drv_add_interface(local, sdata);
416 	if (WARN_ON(ret)) {
417 		/* ok .. stupid driver, it asked for this! */
418 		kfree(sdata);
419 		return ret;
420 	}
421 
422 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
423 	if (ret) {
424 		kfree(sdata);
425 		return ret;
426 	}
427 
428 	mutex_lock(&local->iflist_mtx);
429 	rcu_assign_pointer(local->monitor_sdata, sdata);
430 	mutex_unlock(&local->iflist_mtx);
431 
432 	mutex_lock(&local->mtx);
433 	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
434 					IEEE80211_CHANCTX_EXCLUSIVE);
435 	mutex_unlock(&local->mtx);
436 	if (ret) {
437 		mutex_lock(&local->iflist_mtx);
438 		RCU_INIT_POINTER(local->monitor_sdata, NULL);
439 		mutex_unlock(&local->iflist_mtx);
440 		synchronize_net();
441 		drv_remove_interface(local, sdata);
442 		kfree(sdata);
443 		return ret;
444 	}
445 
446 	skb_queue_head_init(&sdata->skb_queue);
447 	INIT_WORK(&sdata->work, ieee80211_iface_work);
448 
449 	return 0;
450 }
451 
452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
453 {
454 	struct ieee80211_sub_if_data *sdata;
455 
456 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
457 		return;
458 
459 	ASSERT_RTNL();
460 
461 	mutex_lock(&local->iflist_mtx);
462 
463 	sdata = rcu_dereference_protected(local->monitor_sdata,
464 					  lockdep_is_held(&local->iflist_mtx));
465 	if (!sdata) {
466 		mutex_unlock(&local->iflist_mtx);
467 		return;
468 	}
469 
470 	RCU_INIT_POINTER(local->monitor_sdata, NULL);
471 	mutex_unlock(&local->iflist_mtx);
472 
473 	synchronize_net();
474 
475 	mutex_lock(&local->mtx);
476 	ieee80211_vif_release_channel(sdata);
477 	mutex_unlock(&local->mtx);
478 
479 	drv_remove_interface(local, sdata);
480 
481 	kfree(sdata);
482 }
483 
484 /*
485  * NOTE: Be very careful when changing this function, it must NOT return
486  * an error on interface type changes that have been pre-checked, so most
487  * checks should be in ieee80211_check_concurrent_iface.
488  */
489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
490 {
491 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
492 	struct net_device *dev = wdev->netdev;
493 	struct ieee80211_local *local = sdata->local;
494 	struct sta_info *sta;
495 	u32 changed = 0;
496 	int res;
497 	u32 hw_reconf_flags = 0;
498 
499 	switch (sdata->vif.type) {
500 	case NL80211_IFTYPE_WDS:
501 		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
502 			return -ENOLINK;
503 		break;
504 	case NL80211_IFTYPE_AP_VLAN: {
505 		struct ieee80211_sub_if_data *master;
506 
507 		if (!sdata->bss)
508 			return -ENOLINK;
509 
510 		mutex_lock(&local->mtx);
511 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
512 		mutex_unlock(&local->mtx);
513 
514 		master = container_of(sdata->bss,
515 				      struct ieee80211_sub_if_data, u.ap);
516 		sdata->control_port_protocol =
517 			master->control_port_protocol;
518 		sdata->control_port_no_encrypt =
519 			master->control_port_no_encrypt;
520 		sdata->control_port_over_nl80211 =
521 			master->control_port_over_nl80211;
522 		sdata->vif.cab_queue = master->vif.cab_queue;
523 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
524 		       sizeof(sdata->vif.hw_queue));
525 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
526 
527 		mutex_lock(&local->key_mtx);
528 		sdata->crypto_tx_tailroom_needed_cnt +=
529 			master->crypto_tx_tailroom_needed_cnt;
530 		mutex_unlock(&local->key_mtx);
531 
532 		break;
533 		}
534 	case NL80211_IFTYPE_AP:
535 		sdata->bss = &sdata->u.ap;
536 		break;
537 	case NL80211_IFTYPE_MESH_POINT:
538 	case NL80211_IFTYPE_STATION:
539 	case NL80211_IFTYPE_MONITOR:
540 	case NL80211_IFTYPE_ADHOC:
541 	case NL80211_IFTYPE_P2P_DEVICE:
542 	case NL80211_IFTYPE_OCB:
543 	case NL80211_IFTYPE_NAN:
544 		/* no special treatment */
545 		break;
546 	case NL80211_IFTYPE_UNSPECIFIED:
547 	case NUM_NL80211_IFTYPES:
548 	case NL80211_IFTYPE_P2P_CLIENT:
549 	case NL80211_IFTYPE_P2P_GO:
550 		/* cannot happen */
551 		WARN_ON(1);
552 		break;
553 	}
554 
555 	if (local->open_count == 0) {
556 		res = drv_start(local);
557 		if (res)
558 			goto err_del_bss;
559 		/* we're brought up, everything changes */
560 		hw_reconf_flags = ~0;
561 		ieee80211_led_radio(local, true);
562 		ieee80211_mod_tpt_led_trig(local,
563 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
564 	}
565 
566 	/*
567 	 * Copy the hopefully now-present MAC address to
568 	 * this interface, if it has the special null one.
569 	 */
570 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
571 		memcpy(dev->dev_addr,
572 		       local->hw.wiphy->perm_addr,
573 		       ETH_ALEN);
574 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
575 
576 		if (!is_valid_ether_addr(dev->dev_addr)) {
577 			res = -EADDRNOTAVAIL;
578 			goto err_stop;
579 		}
580 	}
581 
582 	switch (sdata->vif.type) {
583 	case NL80211_IFTYPE_AP_VLAN:
584 		/* no need to tell driver, but set carrier and chanctx */
585 		if (rtnl_dereference(sdata->bss->beacon)) {
586 			ieee80211_vif_vlan_copy_chanctx(sdata);
587 			netif_carrier_on(dev);
588 		} else {
589 			netif_carrier_off(dev);
590 		}
591 		break;
592 	case NL80211_IFTYPE_MONITOR:
593 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
594 			local->cooked_mntrs++;
595 			break;
596 		}
597 
598 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
599 			res = drv_add_interface(local, sdata);
600 			if (res)
601 				goto err_stop;
602 		} else if (local->monitors == 0 && local->open_count == 0) {
603 			res = ieee80211_add_virtual_monitor(local);
604 			if (res)
605 				goto err_stop;
606 		}
607 
608 		/* must be before the call to ieee80211_configure_filter */
609 		local->monitors++;
610 		if (local->monitors == 1) {
611 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
612 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
613 		}
614 
615 		ieee80211_adjust_monitor_flags(sdata, 1);
616 		ieee80211_configure_filter(local);
617 		mutex_lock(&local->mtx);
618 		ieee80211_recalc_idle(local);
619 		mutex_unlock(&local->mtx);
620 
621 		netif_carrier_on(dev);
622 		break;
623 	default:
624 		if (coming_up) {
625 			ieee80211_del_virtual_monitor(local);
626 
627 			res = drv_add_interface(local, sdata);
628 			if (res)
629 				goto err_stop;
630 			res = ieee80211_check_queues(sdata,
631 				ieee80211_vif_type_p2p(&sdata->vif));
632 			if (res)
633 				goto err_del_interface;
634 		}
635 
636 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
637 			local->fif_pspoll++;
638 			local->fif_probe_req++;
639 
640 			ieee80211_configure_filter(local);
641 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
642 			local->fif_probe_req++;
643 		}
644 
645 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
646 		    sdata->vif.type != NL80211_IFTYPE_NAN)
647 			changed |= ieee80211_reset_erp_info(sdata);
648 		ieee80211_bss_info_change_notify(sdata, changed);
649 
650 		switch (sdata->vif.type) {
651 		case NL80211_IFTYPE_STATION:
652 		case NL80211_IFTYPE_ADHOC:
653 		case NL80211_IFTYPE_AP:
654 		case NL80211_IFTYPE_MESH_POINT:
655 		case NL80211_IFTYPE_OCB:
656 			netif_carrier_off(dev);
657 			break;
658 		case NL80211_IFTYPE_WDS:
659 		case NL80211_IFTYPE_P2P_DEVICE:
660 		case NL80211_IFTYPE_NAN:
661 			break;
662 		default:
663 			/* not reached */
664 			WARN_ON(1);
665 		}
666 
667 		/*
668 		 * Set default queue parameters so drivers don't
669 		 * need to initialise the hardware if the hardware
670 		 * doesn't start up with sane defaults.
671 		 * Enable QoS for anything but station interfaces.
672 		 */
673 		ieee80211_set_wmm_default(sdata, true,
674 			sdata->vif.type != NL80211_IFTYPE_STATION);
675 	}
676 
677 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
678 
679 	switch (sdata->vif.type) {
680 	case NL80211_IFTYPE_WDS:
681 		/* Create STA entry for the WDS peer */
682 		sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
683 				     GFP_KERNEL);
684 		if (!sta) {
685 			res = -ENOMEM;
686 			goto err_del_interface;
687 		}
688 
689 		sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
690 		sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
691 		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
692 
693 		res = sta_info_insert(sta);
694 		if (res) {
695 			/* STA has been freed */
696 			goto err_del_interface;
697 		}
698 
699 		rate_control_rate_init(sta);
700 		netif_carrier_on(dev);
701 		break;
702 	case NL80211_IFTYPE_P2P_DEVICE:
703 		rcu_assign_pointer(local->p2p_sdata, sdata);
704 		break;
705 	case NL80211_IFTYPE_MONITOR:
706 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
707 			break;
708 		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
709 		break;
710 	default:
711 		break;
712 	}
713 
714 	/*
715 	 * set_multicast_list will be invoked by the networking core
716 	 * which will check whether any increments here were done in
717 	 * error and sync them down to the hardware as filter flags.
718 	 */
719 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
720 		atomic_inc(&local->iff_allmultis);
721 
722 	if (coming_up)
723 		local->open_count++;
724 
725 	if (hw_reconf_flags)
726 		ieee80211_hw_config(local, hw_reconf_flags);
727 
728 	ieee80211_recalc_ps(local);
729 
730 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
731 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
732 	    local->ops->wake_tx_queue) {
733 		/* XXX: for AP_VLAN, actually track AP queues */
734 		if (dev)
735 			netif_tx_start_all_queues(dev);
736 	} else if (dev) {
737 		unsigned long flags;
738 		int n_acs = IEEE80211_NUM_ACS;
739 		int ac;
740 
741 		if (local->hw.queues < IEEE80211_NUM_ACS)
742 			n_acs = 1;
743 
744 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
745 		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
746 		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
747 		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
748 			for (ac = 0; ac < n_acs; ac++) {
749 				int ac_queue = sdata->vif.hw_queue[ac];
750 
751 				if (local->queue_stop_reasons[ac_queue] == 0 &&
752 				    skb_queue_empty(&local->pending[ac_queue]))
753 					netif_start_subqueue(dev, ac);
754 			}
755 		}
756 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
757 	}
758 
759 	return 0;
760  err_del_interface:
761 	drv_remove_interface(local, sdata);
762  err_stop:
763 	if (!local->open_count)
764 		drv_stop(local);
765  err_del_bss:
766 	sdata->bss = NULL;
767 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
768 		mutex_lock(&local->mtx);
769 		list_del(&sdata->u.vlan.list);
770 		mutex_unlock(&local->mtx);
771 	}
772 	/* might already be clear but that doesn't matter */
773 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
774 	return res;
775 }
776 
777 static int ieee80211_open(struct net_device *dev)
778 {
779 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
780 	int err;
781 
782 	/* fail early if user set an invalid address */
783 	if (!is_valid_ether_addr(dev->dev_addr))
784 		return -EADDRNOTAVAIL;
785 
786 	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
787 	if (err)
788 		return err;
789 
790 	return ieee80211_do_open(&sdata->wdev, true);
791 }
792 
793 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
794 			      bool going_down)
795 {
796 	struct ieee80211_local *local = sdata->local;
797 	unsigned long flags;
798 	struct sk_buff *skb, *tmp;
799 	u32 hw_reconf_flags = 0;
800 	int i, flushed;
801 	struct ps_data *ps;
802 	struct cfg80211_chan_def chandef;
803 	bool cancel_scan;
804 	struct cfg80211_nan_func *func;
805 
806 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
807 
808 	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
809 	if (cancel_scan)
810 		ieee80211_scan_cancel(local);
811 
812 	/*
813 	 * Stop TX on this interface first.
814 	 */
815 	if (sdata->dev)
816 		netif_tx_stop_all_queues(sdata->dev);
817 
818 	ieee80211_roc_purge(local, sdata);
819 
820 	switch (sdata->vif.type) {
821 	case NL80211_IFTYPE_STATION:
822 		ieee80211_mgd_stop(sdata);
823 		break;
824 	case NL80211_IFTYPE_ADHOC:
825 		ieee80211_ibss_stop(sdata);
826 		break;
827 	case NL80211_IFTYPE_AP:
828 		cancel_work_sync(&sdata->u.ap.request_smps_work);
829 		break;
830 	case NL80211_IFTYPE_MONITOR:
831 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
832 			break;
833 		list_del_rcu(&sdata->u.mntr.list);
834 		break;
835 	default:
836 		break;
837 	}
838 
839 	/*
840 	 * Remove all stations associated with this interface.
841 	 *
842 	 * This must be done before calling ops->remove_interface()
843 	 * because otherwise we can later invoke ops->sta_notify()
844 	 * whenever the STAs are removed, and that invalidates driver
845 	 * assumptions about always getting a vif pointer that is valid
846 	 * (because if we remove a STA after ops->remove_interface()
847 	 * the driver will have removed the vif info already!)
848 	 *
849 	 * In WDS mode a station must exist here and be flushed, for
850 	 * AP_VLANs stations may exist since there's nothing else that
851 	 * would have removed them, but in other modes there shouldn't
852 	 * be any stations.
853 	 */
854 	flushed = sta_info_flush(sdata);
855 	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
856 		     ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
857 		      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
858 
859 	/* don't count this interface for allmulti while it is down */
860 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
861 		atomic_dec(&local->iff_allmultis);
862 
863 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
864 		local->fif_pspoll--;
865 		local->fif_probe_req--;
866 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
867 		local->fif_probe_req--;
868 	}
869 
870 	if (sdata->dev) {
871 		netif_addr_lock_bh(sdata->dev);
872 		spin_lock_bh(&local->filter_lock);
873 		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
874 				 sdata->dev->addr_len);
875 		spin_unlock_bh(&local->filter_lock);
876 		netif_addr_unlock_bh(sdata->dev);
877 	}
878 
879 	del_timer_sync(&local->dynamic_ps_timer);
880 	cancel_work_sync(&local->dynamic_ps_enable_work);
881 
882 	cancel_work_sync(&sdata->recalc_smps);
883 	sdata_lock(sdata);
884 	mutex_lock(&local->mtx);
885 	sdata->vif.csa_active = false;
886 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
887 		sdata->u.mgd.csa_waiting_bcn = false;
888 	if (sdata->csa_block_tx) {
889 		ieee80211_wake_vif_queues(local, sdata,
890 					  IEEE80211_QUEUE_STOP_REASON_CSA);
891 		sdata->csa_block_tx = false;
892 	}
893 	mutex_unlock(&local->mtx);
894 	sdata_unlock(sdata);
895 
896 	cancel_work_sync(&sdata->csa_finalize_work);
897 
898 	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
899 
900 	if (sdata->wdev.cac_started) {
901 		chandef = sdata->vif.bss_conf.chandef;
902 		WARN_ON(local->suspended);
903 		mutex_lock(&local->mtx);
904 		ieee80211_vif_release_channel(sdata);
905 		mutex_unlock(&local->mtx);
906 		cfg80211_cac_event(sdata->dev, &chandef,
907 				   NL80211_RADAR_CAC_ABORTED,
908 				   GFP_KERNEL);
909 	}
910 
911 	/* APs need special treatment */
912 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
913 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
914 
915 		/* down all dependent devices, that is VLANs */
916 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
917 					 u.vlan.list)
918 			dev_close(vlan->dev);
919 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
920 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
921 		/* remove all packets in parent bc_buf pointing to this dev */
922 		ps = &sdata->bss->ps;
923 
924 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
925 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
926 			if (skb->dev == sdata->dev) {
927 				__skb_unlink(skb, &ps->bc_buf);
928 				local->total_ps_buffered--;
929 				ieee80211_free_txskb(&local->hw, skb);
930 			}
931 		}
932 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
933 	}
934 
935 	if (going_down)
936 		local->open_count--;
937 
938 	switch (sdata->vif.type) {
939 	case NL80211_IFTYPE_AP_VLAN:
940 		mutex_lock(&local->mtx);
941 		list_del(&sdata->u.vlan.list);
942 		mutex_unlock(&local->mtx);
943 		RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
944 		/* see comment in the default case below */
945 		ieee80211_free_keys(sdata, true);
946 		/* no need to tell driver */
947 		break;
948 	case NL80211_IFTYPE_MONITOR:
949 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
950 			local->cooked_mntrs--;
951 			break;
952 		}
953 
954 		local->monitors--;
955 		if (local->monitors == 0) {
956 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
957 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
958 		}
959 
960 		ieee80211_adjust_monitor_flags(sdata, -1);
961 		break;
962 	case NL80211_IFTYPE_NAN:
963 		/* clean all the functions */
964 		spin_lock_bh(&sdata->u.nan.func_lock);
965 
966 		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
967 			idr_remove(&sdata->u.nan.function_inst_ids, i);
968 			cfg80211_free_nan_func(func);
969 		}
970 		idr_destroy(&sdata->u.nan.function_inst_ids);
971 
972 		spin_unlock_bh(&sdata->u.nan.func_lock);
973 		break;
974 	case NL80211_IFTYPE_P2P_DEVICE:
975 		/* relies on synchronize_rcu() below */
976 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
977 		/* fall through */
978 	default:
979 		cancel_work_sync(&sdata->work);
980 		/*
981 		 * When we get here, the interface is marked down.
982 		 * Free the remaining keys, if there are any
983 		 * (which can happen in AP mode if userspace sets
984 		 * keys before the interface is operating, and maybe
985 		 * also in WDS mode)
986 		 *
987 		 * Force the key freeing to always synchronize_net()
988 		 * to wait for the RX path in case it is using this
989 		 * interface enqueuing frames at this very time on
990 		 * another CPU.
991 		 */
992 		ieee80211_free_keys(sdata, true);
993 		skb_queue_purge(&sdata->skb_queue);
994 	}
995 
996 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
997 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
998 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
999 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1000 			if (info->control.vif == &sdata->vif) {
1001 				__skb_unlink(skb, &local->pending[i]);
1002 				ieee80211_free_txskb(&local->hw, skb);
1003 			}
1004 		}
1005 	}
1006 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1007 
1008 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1009 		ieee80211_txq_remove_vlan(local, sdata);
1010 
1011 	sdata->bss = NULL;
1012 
1013 	if (local->open_count == 0)
1014 		ieee80211_clear_tx_pending(local);
1015 
1016 	sdata->vif.bss_conf.beacon_int = 0;
1017 
1018 	/*
1019 	 * If the interface goes down while suspended, presumably because
1020 	 * the device was unplugged and that happens before our resume,
1021 	 * then the driver is already unconfigured and the remainder of
1022 	 * this function isn't needed.
1023 	 * XXX: what about WoWLAN? If the device has software state, e.g.
1024 	 *	memory allocated, it might expect teardown commands from
1025 	 *	mac80211 here?
1026 	 */
1027 	if (local->suspended) {
1028 		WARN_ON(local->wowlan);
1029 		WARN_ON(rtnl_dereference(local->monitor_sdata));
1030 		return;
1031 	}
1032 
1033 	switch (sdata->vif.type) {
1034 	case NL80211_IFTYPE_AP_VLAN:
1035 		break;
1036 	case NL80211_IFTYPE_MONITOR:
1037 		if (local->monitors == 0)
1038 			ieee80211_del_virtual_monitor(local);
1039 
1040 		mutex_lock(&local->mtx);
1041 		ieee80211_recalc_idle(local);
1042 		mutex_unlock(&local->mtx);
1043 
1044 		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1045 			break;
1046 
1047 		/* fall through */
1048 	default:
1049 		if (going_down)
1050 			drv_remove_interface(local, sdata);
1051 	}
1052 
1053 	ieee80211_recalc_ps(local);
1054 
1055 	if (cancel_scan)
1056 		flush_delayed_work(&local->scan_work);
1057 
1058 	if (local->open_count == 0) {
1059 		ieee80211_stop_device(local);
1060 
1061 		/* no reconfiguring after stop! */
1062 		return;
1063 	}
1064 
1065 	/* do after stop to avoid reconfiguring when we stop anyway */
1066 	ieee80211_configure_filter(local);
1067 	ieee80211_hw_config(local, hw_reconf_flags);
1068 
1069 	if (local->monitors == local->open_count)
1070 		ieee80211_add_virtual_monitor(local);
1071 }
1072 
1073 static int ieee80211_stop(struct net_device *dev)
1074 {
1075 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1076 
1077 	ieee80211_do_stop(sdata, true);
1078 
1079 	return 0;
1080 }
1081 
1082 static void ieee80211_set_multicast_list(struct net_device *dev)
1083 {
1084 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1085 	struct ieee80211_local *local = sdata->local;
1086 	int allmulti, sdata_allmulti;
1087 
1088 	allmulti = !!(dev->flags & IFF_ALLMULTI);
1089 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1090 
1091 	if (allmulti != sdata_allmulti) {
1092 		if (dev->flags & IFF_ALLMULTI)
1093 			atomic_inc(&local->iff_allmultis);
1094 		else
1095 			atomic_dec(&local->iff_allmultis);
1096 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1097 	}
1098 
1099 	spin_lock_bh(&local->filter_lock);
1100 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1101 	spin_unlock_bh(&local->filter_lock);
1102 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1103 }
1104 
1105 /*
1106  * Called when the netdev is removed or, by the code below, before
1107  * the interface type changes.
1108  */
1109 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1110 {
1111 	int i;
1112 
1113 	/* free extra data */
1114 	ieee80211_free_keys(sdata, false);
1115 
1116 	ieee80211_debugfs_remove_netdev(sdata);
1117 
1118 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1119 		__skb_queue_purge(&sdata->fragments[i].skb_list);
1120 	sdata->fragment_next = 0;
1121 
1122 	if (ieee80211_vif_is_mesh(&sdata->vif))
1123 		ieee80211_mesh_teardown_sdata(sdata);
1124 }
1125 
1126 static void ieee80211_uninit(struct net_device *dev)
1127 {
1128 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1129 }
1130 
1131 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1132 					 struct sk_buff *skb,
1133 					 struct net_device *sb_dev)
1134 {
1135 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1136 }
1137 
1138 static void
1139 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1140 {
1141 	int i;
1142 
1143 	for_each_possible_cpu(i) {
1144 		const struct pcpu_sw_netstats *tstats;
1145 		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1146 		unsigned int start;
1147 
1148 		tstats = per_cpu_ptr(dev->tstats, i);
1149 
1150 		do {
1151 			start = u64_stats_fetch_begin_irq(&tstats->syncp);
1152 			rx_packets = tstats->rx_packets;
1153 			tx_packets = tstats->tx_packets;
1154 			rx_bytes = tstats->rx_bytes;
1155 			tx_bytes = tstats->tx_bytes;
1156 		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1157 
1158 		stats->rx_packets += rx_packets;
1159 		stats->tx_packets += tx_packets;
1160 		stats->rx_bytes   += rx_bytes;
1161 		stats->tx_bytes   += tx_bytes;
1162 	}
1163 }
1164 
1165 static const struct net_device_ops ieee80211_dataif_ops = {
1166 	.ndo_open		= ieee80211_open,
1167 	.ndo_stop		= ieee80211_stop,
1168 	.ndo_uninit		= ieee80211_uninit,
1169 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
1170 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1171 	.ndo_set_mac_address 	= ieee80211_change_mac,
1172 	.ndo_select_queue	= ieee80211_netdev_select_queue,
1173 	.ndo_get_stats64	= ieee80211_get_stats64,
1174 };
1175 
1176 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1177 					  struct sk_buff *skb,
1178 					  struct net_device *sb_dev)
1179 {
1180 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181 	struct ieee80211_local *local = sdata->local;
1182 	struct ieee80211_hdr *hdr;
1183 	struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184 
1185 	if (local->hw.queues < IEEE80211_NUM_ACS)
1186 		return 0;
1187 
1188 	if (skb->len < 4 ||
1189 	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190 		return 0; /* doesn't matter, frame will be dropped */
1191 
1192 	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193 
1194 	return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196 
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198 	.ndo_open		= ieee80211_open,
1199 	.ndo_stop		= ieee80211_stop,
1200 	.ndo_uninit		= ieee80211_uninit,
1201 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
1202 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1203 	.ndo_set_mac_address 	= ieee80211_change_mac,
1204 	.ndo_select_queue	= ieee80211_monitor_select_queue,
1205 	.ndo_get_stats64	= ieee80211_get_stats64,
1206 };
1207 
1208 static void ieee80211_if_free(struct net_device *dev)
1209 {
1210 	free_percpu(dev->tstats);
1211 }
1212 
1213 static void ieee80211_if_setup(struct net_device *dev)
1214 {
1215 	ether_setup(dev);
1216 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1217 	dev->netdev_ops = &ieee80211_dataif_ops;
1218 	dev->needs_free_netdev = true;
1219 	dev->priv_destructor = ieee80211_if_free;
1220 }
1221 
1222 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1223 {
1224 	ieee80211_if_setup(dev);
1225 	dev->priv_flags |= IFF_NO_QUEUE;
1226 }
1227 
1228 static void ieee80211_iface_work(struct work_struct *work)
1229 {
1230 	struct ieee80211_sub_if_data *sdata =
1231 		container_of(work, struct ieee80211_sub_if_data, work);
1232 	struct ieee80211_local *local = sdata->local;
1233 	struct sk_buff *skb;
1234 	struct sta_info *sta;
1235 
1236 	if (!ieee80211_sdata_running(sdata))
1237 		return;
1238 
1239 	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1240 		return;
1241 
1242 	if (!ieee80211_can_run_worker(local))
1243 		return;
1244 
1245 	/* first process frames */
1246 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1247 		struct ieee80211_mgmt *mgmt = (void *)skb->data;
1248 
1249 		if (ieee80211_is_action(mgmt->frame_control) &&
1250 		    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1251 			int len = skb->len;
1252 
1253 			mutex_lock(&local->sta_mtx);
1254 			sta = sta_info_get_bss(sdata, mgmt->sa);
1255 			if (sta) {
1256 				switch (mgmt->u.action.u.addba_req.action_code) {
1257 				case WLAN_ACTION_ADDBA_REQ:
1258 					ieee80211_process_addba_request(
1259 							local, sta, mgmt, len);
1260 					break;
1261 				case WLAN_ACTION_ADDBA_RESP:
1262 					ieee80211_process_addba_resp(local, sta,
1263 								     mgmt, len);
1264 					break;
1265 				case WLAN_ACTION_DELBA:
1266 					ieee80211_process_delba(sdata, sta,
1267 								mgmt, len);
1268 					break;
1269 				default:
1270 					WARN_ON(1);
1271 					break;
1272 				}
1273 			}
1274 			mutex_unlock(&local->sta_mtx);
1275 		} else if (ieee80211_is_action(mgmt->frame_control) &&
1276 			   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1277 			switch (mgmt->u.action.u.vht_group_notif.action_code) {
1278 			case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1279 				struct ieee80211_rx_status *status;
1280 				enum nl80211_band band;
1281 				u8 opmode;
1282 
1283 				status = IEEE80211_SKB_RXCB(skb);
1284 				band = status->band;
1285 				opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1286 
1287 				mutex_lock(&local->sta_mtx);
1288 				sta = sta_info_get_bss(sdata, mgmt->sa);
1289 
1290 				if (sta)
1291 					ieee80211_vht_handle_opmode(sdata, sta,
1292 								    opmode,
1293 								    band);
1294 
1295 				mutex_unlock(&local->sta_mtx);
1296 				break;
1297 			}
1298 			case WLAN_VHT_ACTION_GROUPID_MGMT:
1299 				ieee80211_process_mu_groups(sdata, mgmt);
1300 				break;
1301 			default:
1302 				WARN_ON(1);
1303 				break;
1304 			}
1305 		} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1306 			struct ieee80211_hdr *hdr = (void *)mgmt;
1307 			/*
1308 			 * So the frame isn't mgmt, but frame_control
1309 			 * is at the right place anyway, of course, so
1310 			 * the if statement is correct.
1311 			 *
1312 			 * Warn if we have other data frame types here,
1313 			 * they must not get here.
1314 			 */
1315 			WARN_ON(hdr->frame_control &
1316 					cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1317 			WARN_ON(!(hdr->seq_ctrl &
1318 					cpu_to_le16(IEEE80211_SCTL_FRAG)));
1319 			/*
1320 			 * This was a fragment of a frame, received while
1321 			 * a block-ack session was active. That cannot be
1322 			 * right, so terminate the session.
1323 			 */
1324 			mutex_lock(&local->sta_mtx);
1325 			sta = sta_info_get_bss(sdata, mgmt->sa);
1326 			if (sta) {
1327 				u16 tid = ieee80211_get_tid(hdr);
1328 
1329 				__ieee80211_stop_rx_ba_session(
1330 					sta, tid, WLAN_BACK_RECIPIENT,
1331 					WLAN_REASON_QSTA_REQUIRE_SETUP,
1332 					true);
1333 			}
1334 			mutex_unlock(&local->sta_mtx);
1335 		} else switch (sdata->vif.type) {
1336 		case NL80211_IFTYPE_STATION:
1337 			ieee80211_sta_rx_queued_mgmt(sdata, skb);
1338 			break;
1339 		case NL80211_IFTYPE_ADHOC:
1340 			ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1341 			break;
1342 		case NL80211_IFTYPE_MESH_POINT:
1343 			if (!ieee80211_vif_is_mesh(&sdata->vif))
1344 				break;
1345 			ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1346 			break;
1347 		default:
1348 			WARN(1, "frame for unexpected interface type");
1349 			break;
1350 		}
1351 
1352 		kfree_skb(skb);
1353 	}
1354 
1355 	/* then other type-dependent work */
1356 	switch (sdata->vif.type) {
1357 	case NL80211_IFTYPE_STATION:
1358 		ieee80211_sta_work(sdata);
1359 		break;
1360 	case NL80211_IFTYPE_ADHOC:
1361 		ieee80211_ibss_work(sdata);
1362 		break;
1363 	case NL80211_IFTYPE_MESH_POINT:
1364 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1365 			break;
1366 		ieee80211_mesh_work(sdata);
1367 		break;
1368 	case NL80211_IFTYPE_OCB:
1369 		ieee80211_ocb_work(sdata);
1370 		break;
1371 	default:
1372 		break;
1373 	}
1374 }
1375 
1376 static void ieee80211_recalc_smps_work(struct work_struct *work)
1377 {
1378 	struct ieee80211_sub_if_data *sdata =
1379 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1380 
1381 	ieee80211_recalc_smps(sdata);
1382 }
1383 
1384 /*
1385  * Helper function to initialise an interface to a specific type.
1386  */
1387 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1388 				  enum nl80211_iftype type)
1389 {
1390 	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1391 						    0xff, 0xff, 0xff};
1392 
1393 	/* clear type-dependent union */
1394 	memset(&sdata->u, 0, sizeof(sdata->u));
1395 
1396 	/* and set some type-dependent values */
1397 	sdata->vif.type = type;
1398 	sdata->vif.p2p = false;
1399 	sdata->wdev.iftype = type;
1400 
1401 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1402 	sdata->control_port_no_encrypt = false;
1403 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1404 	sdata->vif.bss_conf.idle = true;
1405 
1406 	sdata->noack_map = 0;
1407 
1408 	/* only monitor/p2p-device differ */
1409 	if (sdata->dev) {
1410 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1411 		sdata->dev->type = ARPHRD_ETHER;
1412 	}
1413 
1414 	skb_queue_head_init(&sdata->skb_queue);
1415 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1416 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1417 	INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1418 	INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1419 	INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1420 
1421 	switch (type) {
1422 	case NL80211_IFTYPE_P2P_GO:
1423 		type = NL80211_IFTYPE_AP;
1424 		sdata->vif.type = type;
1425 		sdata->vif.p2p = true;
1426 		/* fall through */
1427 	case NL80211_IFTYPE_AP:
1428 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1429 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1430 		INIT_WORK(&sdata->u.ap.request_smps_work,
1431 			  ieee80211_request_smps_ap_work);
1432 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1433 		sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1434 		break;
1435 	case NL80211_IFTYPE_P2P_CLIENT:
1436 		type = NL80211_IFTYPE_STATION;
1437 		sdata->vif.type = type;
1438 		sdata->vif.p2p = true;
1439 		/* fall through */
1440 	case NL80211_IFTYPE_STATION:
1441 		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1442 		ieee80211_sta_setup_sdata(sdata);
1443 		break;
1444 	case NL80211_IFTYPE_OCB:
1445 		sdata->vif.bss_conf.bssid = bssid_wildcard;
1446 		ieee80211_ocb_setup_sdata(sdata);
1447 		break;
1448 	case NL80211_IFTYPE_ADHOC:
1449 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1450 		ieee80211_ibss_setup_sdata(sdata);
1451 		break;
1452 	case NL80211_IFTYPE_MESH_POINT:
1453 		if (ieee80211_vif_is_mesh(&sdata->vif))
1454 			ieee80211_mesh_init_sdata(sdata);
1455 		break;
1456 	case NL80211_IFTYPE_MONITOR:
1457 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1458 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1459 		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1460 				      MONITOR_FLAG_OTHER_BSS;
1461 		break;
1462 	case NL80211_IFTYPE_WDS:
1463 		sdata->vif.bss_conf.bssid = NULL;
1464 		break;
1465 	case NL80211_IFTYPE_NAN:
1466 		idr_init(&sdata->u.nan.function_inst_ids);
1467 		spin_lock_init(&sdata->u.nan.func_lock);
1468 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1469 		break;
1470 	case NL80211_IFTYPE_AP_VLAN:
1471 	case NL80211_IFTYPE_P2P_DEVICE:
1472 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1473 		break;
1474 	case NL80211_IFTYPE_UNSPECIFIED:
1475 	case NUM_NL80211_IFTYPES:
1476 		WARN_ON(1);
1477 		break;
1478 	}
1479 
1480 	ieee80211_debugfs_add_netdev(sdata);
1481 }
1482 
1483 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1484 					   enum nl80211_iftype type)
1485 {
1486 	struct ieee80211_local *local = sdata->local;
1487 	int ret, err;
1488 	enum nl80211_iftype internal_type = type;
1489 	bool p2p = false;
1490 
1491 	ASSERT_RTNL();
1492 
1493 	if (!local->ops->change_interface)
1494 		return -EBUSY;
1495 
1496 	switch (sdata->vif.type) {
1497 	case NL80211_IFTYPE_AP:
1498 	case NL80211_IFTYPE_STATION:
1499 	case NL80211_IFTYPE_ADHOC:
1500 	case NL80211_IFTYPE_OCB:
1501 		/*
1502 		 * Could maybe also all others here?
1503 		 * Just not sure how that interacts
1504 		 * with the RX/config path e.g. for
1505 		 * mesh.
1506 		 */
1507 		break;
1508 	default:
1509 		return -EBUSY;
1510 	}
1511 
1512 	switch (type) {
1513 	case NL80211_IFTYPE_AP:
1514 	case NL80211_IFTYPE_STATION:
1515 	case NL80211_IFTYPE_ADHOC:
1516 	case NL80211_IFTYPE_OCB:
1517 		/*
1518 		 * Could probably support everything
1519 		 * but WDS here (WDS do_open can fail
1520 		 * under memory pressure, which this
1521 		 * code isn't prepared to handle).
1522 		 */
1523 		break;
1524 	case NL80211_IFTYPE_P2P_CLIENT:
1525 		p2p = true;
1526 		internal_type = NL80211_IFTYPE_STATION;
1527 		break;
1528 	case NL80211_IFTYPE_P2P_GO:
1529 		p2p = true;
1530 		internal_type = NL80211_IFTYPE_AP;
1531 		break;
1532 	default:
1533 		return -EBUSY;
1534 	}
1535 
1536 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1537 	if (ret)
1538 		return ret;
1539 
1540 	ieee80211_do_stop(sdata, false);
1541 
1542 	ieee80211_teardown_sdata(sdata);
1543 
1544 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1545 	if (ret)
1546 		type = ieee80211_vif_type_p2p(&sdata->vif);
1547 
1548 	/*
1549 	 * Ignore return value here, there's not much we can do since
1550 	 * the driver changed the interface type internally already.
1551 	 * The warnings will hopefully make driver authors fix it :-)
1552 	 */
1553 	ieee80211_check_queues(sdata, type);
1554 
1555 	ieee80211_setup_sdata(sdata, type);
1556 
1557 	err = ieee80211_do_open(&sdata->wdev, false);
1558 	WARN(err, "type change: do_open returned %d", err);
1559 
1560 	return ret;
1561 }
1562 
1563 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1564 			     enum nl80211_iftype type)
1565 {
1566 	int ret;
1567 
1568 	ASSERT_RTNL();
1569 
1570 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1571 		return 0;
1572 
1573 	if (ieee80211_sdata_running(sdata)) {
1574 		ret = ieee80211_runtime_change_iftype(sdata, type);
1575 		if (ret)
1576 			return ret;
1577 	} else {
1578 		/* Purge and reset type-dependent state. */
1579 		ieee80211_teardown_sdata(sdata);
1580 		ieee80211_setup_sdata(sdata, type);
1581 	}
1582 
1583 	/* reset some values that shouldn't be kept across type changes */
1584 	if (type == NL80211_IFTYPE_STATION)
1585 		sdata->u.mgd.use_4addr = false;
1586 
1587 	return 0;
1588 }
1589 
1590 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1591 				       u8 *perm_addr, enum nl80211_iftype type)
1592 {
1593 	struct ieee80211_sub_if_data *sdata;
1594 	u64 mask, start, addr, val, inc;
1595 	u8 *m;
1596 	u8 tmp_addr[ETH_ALEN];
1597 	int i;
1598 
1599 	/* default ... something at least */
1600 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1601 
1602 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1603 	    local->hw.wiphy->n_addresses <= 1)
1604 		return;
1605 
1606 	mutex_lock(&local->iflist_mtx);
1607 
1608 	switch (type) {
1609 	case NL80211_IFTYPE_MONITOR:
1610 		/* doesn't matter */
1611 		break;
1612 	case NL80211_IFTYPE_WDS:
1613 	case NL80211_IFTYPE_AP_VLAN:
1614 		/* match up with an AP interface */
1615 		list_for_each_entry(sdata, &local->interfaces, list) {
1616 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1617 				continue;
1618 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1619 			break;
1620 		}
1621 		/* keep default if no AP interface present */
1622 		break;
1623 	case NL80211_IFTYPE_P2P_CLIENT:
1624 	case NL80211_IFTYPE_P2P_GO:
1625 		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1626 			list_for_each_entry(sdata, &local->interfaces, list) {
1627 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1628 					continue;
1629 				if (!ieee80211_sdata_running(sdata))
1630 					continue;
1631 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1632 				goto out_unlock;
1633 			}
1634 		}
1635 		/* fall through */
1636 	default:
1637 		/* assign a new address if possible -- try n_addresses first */
1638 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1639 			bool used = false;
1640 
1641 			list_for_each_entry(sdata, &local->interfaces, list) {
1642 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1643 						     sdata->vif.addr)) {
1644 					used = true;
1645 					break;
1646 				}
1647 			}
1648 
1649 			if (!used) {
1650 				memcpy(perm_addr,
1651 				       local->hw.wiphy->addresses[i].addr,
1652 				       ETH_ALEN);
1653 				break;
1654 			}
1655 		}
1656 
1657 		/* try mask if available */
1658 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1659 			break;
1660 
1661 		m = local->hw.wiphy->addr_mask;
1662 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1663 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1664 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1665 
1666 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1667 			/* not a contiguous mask ... not handled now! */
1668 			pr_info("not contiguous\n");
1669 			break;
1670 		}
1671 
1672 		/*
1673 		 * Pick address of existing interface in case user changed
1674 		 * MAC address manually, default to perm_addr.
1675 		 */
1676 		m = local->hw.wiphy->perm_addr;
1677 		list_for_each_entry(sdata, &local->interfaces, list) {
1678 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1679 				continue;
1680 			m = sdata->vif.addr;
1681 			break;
1682 		}
1683 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1684 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1685 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1686 
1687 		inc = 1ULL<<__ffs64(mask);
1688 		val = (start & mask);
1689 		addr = (start & ~mask) | (val & mask);
1690 		do {
1691 			bool used = false;
1692 
1693 			tmp_addr[5] = addr >> 0*8;
1694 			tmp_addr[4] = addr >> 1*8;
1695 			tmp_addr[3] = addr >> 2*8;
1696 			tmp_addr[2] = addr >> 3*8;
1697 			tmp_addr[1] = addr >> 4*8;
1698 			tmp_addr[0] = addr >> 5*8;
1699 
1700 			val += inc;
1701 
1702 			list_for_each_entry(sdata, &local->interfaces, list) {
1703 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1704 					used = true;
1705 					break;
1706 				}
1707 			}
1708 
1709 			if (!used) {
1710 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1711 				break;
1712 			}
1713 			addr = (start & ~mask) | (val & mask);
1714 		} while (addr != start);
1715 
1716 		break;
1717 	}
1718 
1719  out_unlock:
1720 	mutex_unlock(&local->iflist_mtx);
1721 }
1722 
1723 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1724 		     unsigned char name_assign_type,
1725 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1726 		     struct vif_params *params)
1727 {
1728 	struct net_device *ndev = NULL;
1729 	struct ieee80211_sub_if_data *sdata = NULL;
1730 	struct txq_info *txqi;
1731 	void (*if_setup)(struct net_device *dev);
1732 	int ret, i;
1733 	int txqs = 1;
1734 
1735 	ASSERT_RTNL();
1736 
1737 	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1738 		struct wireless_dev *wdev;
1739 
1740 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1741 				GFP_KERNEL);
1742 		if (!sdata)
1743 			return -ENOMEM;
1744 		wdev = &sdata->wdev;
1745 
1746 		sdata->dev = NULL;
1747 		strlcpy(sdata->name, name, IFNAMSIZ);
1748 		ieee80211_assign_perm_addr(local, wdev->address, type);
1749 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1750 	} else {
1751 		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1752 				 sizeof(void *));
1753 		int txq_size = 0;
1754 
1755 		if (local->ops->wake_tx_queue &&
1756 		    type != NL80211_IFTYPE_AP_VLAN &&
1757 		    (type != NL80211_IFTYPE_MONITOR ||
1758 		     (params->flags & MONITOR_FLAG_ACTIVE)))
1759 			txq_size += sizeof(struct txq_info) +
1760 				    local->hw.txq_data_size;
1761 
1762 		if (local->ops->wake_tx_queue) {
1763 			if_setup = ieee80211_if_setup_no_queue;
1764 		} else {
1765 			if_setup = ieee80211_if_setup;
1766 			if (local->hw.queues >= IEEE80211_NUM_ACS)
1767 				txqs = IEEE80211_NUM_ACS;
1768 		}
1769 
1770 		ndev = alloc_netdev_mqs(size + txq_size,
1771 					name, name_assign_type,
1772 					if_setup, txqs, 1);
1773 		if (!ndev)
1774 			return -ENOMEM;
1775 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1776 
1777 		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1778 		if (!ndev->tstats) {
1779 			free_netdev(ndev);
1780 			return -ENOMEM;
1781 		}
1782 
1783 		ndev->needed_headroom = local->tx_headroom +
1784 					4*6 /* four MAC addresses */
1785 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1786 					+ 6 /* mesh */
1787 					+ 8 /* rfc1042/bridge tunnel */
1788 					- ETH_HLEN /* ethernet hard_header_len */
1789 					+ IEEE80211_ENCRYPT_HEADROOM;
1790 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1791 
1792 		ret = dev_alloc_name(ndev, ndev->name);
1793 		if (ret < 0) {
1794 			ieee80211_if_free(ndev);
1795 			free_netdev(ndev);
1796 			return ret;
1797 		}
1798 
1799 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1800 		if (is_valid_ether_addr(params->macaddr))
1801 			memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1802 		else
1803 			memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1804 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1805 
1806 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1807 		sdata = netdev_priv(ndev);
1808 		ndev->ieee80211_ptr = &sdata->wdev;
1809 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1810 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
1811 
1812 		if (txq_size) {
1813 			txqi = netdev_priv(ndev) + size;
1814 			ieee80211_txq_init(sdata, NULL, txqi, 0);
1815 		}
1816 
1817 		sdata->dev = ndev;
1818 	}
1819 
1820 	/* initialise type-independent data */
1821 	sdata->wdev.wiphy = local->hw.wiphy;
1822 	sdata->local = local;
1823 
1824 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1825 		skb_queue_head_init(&sdata->fragments[i].skb_list);
1826 
1827 	INIT_LIST_HEAD(&sdata->key_list);
1828 
1829 	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1830 			  ieee80211_dfs_cac_timer_work);
1831 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1832 			  ieee80211_delayed_tailroom_dec);
1833 
1834 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
1835 		struct ieee80211_supported_band *sband;
1836 		sband = local->hw.wiphy->bands[i];
1837 		sdata->rc_rateidx_mask[i] =
1838 			sband ? (1 << sband->n_bitrates) - 1 : 0;
1839 		if (sband) {
1840 			__le16 cap;
1841 			u16 *vht_rate_mask;
1842 
1843 			memcpy(sdata->rc_rateidx_mcs_mask[i],
1844 			       sband->ht_cap.mcs.rx_mask,
1845 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1846 
1847 			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1848 			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1849 			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1850 		} else {
1851 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
1852 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1853 			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1854 			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1855 		}
1856 	}
1857 
1858 	ieee80211_set_default_queues(sdata);
1859 
1860 	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1861 	sdata->user_power_level = local->user_power_level;
1862 
1863 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1864 
1865 	/* setup type-dependent data */
1866 	ieee80211_setup_sdata(sdata, type);
1867 
1868 	if (ndev) {
1869 		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1870 		if (type == NL80211_IFTYPE_STATION)
1871 			sdata->u.mgd.use_4addr = params->use_4addr;
1872 
1873 		ndev->features |= local->hw.netdev_features;
1874 
1875 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1876 
1877 		/* MTU range: 256 - 2304 */
1878 		ndev->min_mtu = 256;
1879 		ndev->max_mtu = local->hw.max_mtu;
1880 
1881 		ret = register_netdevice(ndev);
1882 		if (ret) {
1883 			free_netdev(ndev);
1884 			return ret;
1885 		}
1886 	}
1887 
1888 	mutex_lock(&local->iflist_mtx);
1889 	list_add_tail_rcu(&sdata->list, &local->interfaces);
1890 	mutex_unlock(&local->iflist_mtx);
1891 
1892 	if (new_wdev)
1893 		*new_wdev = &sdata->wdev;
1894 
1895 	return 0;
1896 }
1897 
1898 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1899 {
1900 	ASSERT_RTNL();
1901 
1902 	mutex_lock(&sdata->local->iflist_mtx);
1903 	list_del_rcu(&sdata->list);
1904 	mutex_unlock(&sdata->local->iflist_mtx);
1905 
1906 	if (sdata->vif.txq)
1907 		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1908 
1909 	synchronize_rcu();
1910 
1911 	if (sdata->dev) {
1912 		unregister_netdevice(sdata->dev);
1913 	} else {
1914 		cfg80211_unregister_wdev(&sdata->wdev);
1915 		ieee80211_teardown_sdata(sdata);
1916 		kfree(sdata);
1917 	}
1918 }
1919 
1920 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1921 {
1922 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1923 		return;
1924 	ieee80211_do_stop(sdata, true);
1925 }
1926 
1927 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1928 {
1929 	struct ieee80211_sub_if_data *sdata, *tmp;
1930 	LIST_HEAD(unreg_list);
1931 	LIST_HEAD(wdev_list);
1932 
1933 	ASSERT_RTNL();
1934 
1935 	/* Before destroying the interfaces, make sure they're all stopped so
1936 	 * that the hardware is stopped. Otherwise, the driver might still be
1937 	 * iterating the interfaces during the shutdown, e.g. from a worker
1938 	 * or from RX processing or similar, and if it does so (using atomic
1939 	 * iteration) while we're manipulating the list, the iteration will
1940 	 * crash.
1941 	 *
1942 	 * After this, the hardware should be stopped and the driver should
1943 	 * have stopped all of its activities, so that we can do RCU-unaware
1944 	 * manipulations of the interface list below.
1945 	 */
1946 	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1947 
1948 	WARN(local->open_count, "%s: open count remains %d\n",
1949 	     wiphy_name(local->hw.wiphy), local->open_count);
1950 
1951 	ieee80211_txq_teardown_flows(local);
1952 
1953 	mutex_lock(&local->iflist_mtx);
1954 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1955 		list_del(&sdata->list);
1956 
1957 		if (sdata->dev)
1958 			unregister_netdevice_queue(sdata->dev, &unreg_list);
1959 		else
1960 			list_add(&sdata->list, &wdev_list);
1961 	}
1962 	mutex_unlock(&local->iflist_mtx);
1963 	unregister_netdevice_many(&unreg_list);
1964 
1965 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1966 		list_del(&sdata->list);
1967 		cfg80211_unregister_wdev(&sdata->wdev);
1968 		kfree(sdata);
1969 	}
1970 }
1971 
1972 static int netdev_notify(struct notifier_block *nb,
1973 			 unsigned long state, void *ptr)
1974 {
1975 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1976 	struct ieee80211_sub_if_data *sdata;
1977 
1978 	if (state != NETDEV_CHANGENAME)
1979 		return NOTIFY_DONE;
1980 
1981 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1982 		return NOTIFY_DONE;
1983 
1984 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1985 		return NOTIFY_DONE;
1986 
1987 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1988 	memcpy(sdata->name, dev->name, IFNAMSIZ);
1989 	ieee80211_debugfs_rename_netdev(sdata);
1990 
1991 	return NOTIFY_OK;
1992 }
1993 
1994 static struct notifier_block mac80211_netdev_notifier = {
1995 	.notifier_call = netdev_notify,
1996 };
1997 
1998 int ieee80211_iface_init(void)
1999 {
2000 	return register_netdevice_notifier(&mac80211_netdev_notifier);
2001 }
2002 
2003 void ieee80211_iface_exit(void)
2004 {
2005 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2006 }
2007 
2008 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2009 {
2010 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2011 		atomic_inc(&sdata->u.ap.num_mcast_sta);
2012 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2013 		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2014 }
2015 
2016 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2017 {
2018 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2019 		atomic_dec(&sdata->u.ap.num_mcast_sta);
2020 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2021 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2022 }
2023