xref: /openbmc/linux/net/mac80211/iface.c (revision 8a10bc9d)
1 /*
2  * Interface handling
3  *
4  * Copyright 2002-2005, Instant802 Networks, Inc.
5  * Copyright 2005-2006, Devicescape Software, Inc.
6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
46 {
47 	struct ieee80211_chanctx_conf *chanctx_conf;
48 	int power;
49 
50 	rcu_read_lock();
51 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
52 	if (!chanctx_conf) {
53 		rcu_read_unlock();
54 		return false;
55 	}
56 
57 	power = ieee80211_chandef_max_power(&chanctx_conf->def);
58 	rcu_read_unlock();
59 
60 	if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
61 		power = min(power, sdata->user_power_level);
62 
63 	if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 		power = min(power, sdata->ap_power_level);
65 
66 	if (power != sdata->vif.bss_conf.txpower) {
67 		sdata->vif.bss_conf.txpower = power;
68 		ieee80211_hw_config(sdata->local, 0);
69 		return true;
70 	}
71 
72 	return false;
73 }
74 
75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
76 {
77 	if (__ieee80211_recalc_txpower(sdata))
78 		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
79 }
80 
81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
82 {
83 	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
84 		return 0;
85 
86 	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
87 	return IEEE80211_CONF_CHANGE_IDLE;
88 }
89 
90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
91 {
92 	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
93 		return 0;
94 
95 	ieee80211_flush_queues(local, NULL);
96 
97 	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
98 	return IEEE80211_CONF_CHANGE_IDLE;
99 }
100 
101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
102 				   bool force_active)
103 {
104 	bool working = false, scanning, active;
105 	unsigned int led_trig_start = 0, led_trig_stop = 0;
106 	struct ieee80211_roc_work *roc;
107 
108 	lockdep_assert_held(&local->mtx);
109 
110 	active = force_active ||
111 		 !list_empty(&local->chanctx_list) ||
112 		 local->monitors;
113 
114 	if (!local->ops->remain_on_channel) {
115 		list_for_each_entry(roc, &local->roc_list, list) {
116 			working = true;
117 			break;
118 		}
119 	}
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_change_mtu(struct net_device *dev, int new_mtu)
154 {
155 	if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
156 		return -EINVAL;
157 
158 	dev->mtu = new_mtu;
159 	return 0;
160 }
161 
162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
163 				bool check_dup)
164 {
165 	struct ieee80211_local *local = sdata->local;
166 	struct ieee80211_sub_if_data *iter;
167 	u64 new, mask, tmp;
168 	u8 *m;
169 	int ret = 0;
170 
171 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
172 		return 0;
173 
174 	m = addr;
175 	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
176 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
177 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
178 
179 	m = local->hw.wiphy->addr_mask;
180 	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
181 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
182 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
183 
184 	if (!check_dup)
185 		return ret;
186 
187 	mutex_lock(&local->iflist_mtx);
188 	list_for_each_entry(iter, &local->interfaces, list) {
189 		if (iter == sdata)
190 			continue;
191 
192 		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
193 		    !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
194 			continue;
195 
196 		m = iter->vif.addr;
197 		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
198 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
199 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
200 
201 		if ((new & ~mask) != (tmp & ~mask)) {
202 			ret = -EINVAL;
203 			break;
204 		}
205 	}
206 	mutex_unlock(&local->iflist_mtx);
207 
208 	return ret;
209 }
210 
211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
212 {
213 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
214 	struct sockaddr *sa = addr;
215 	bool check_dup = true;
216 	int ret;
217 
218 	if (ieee80211_sdata_running(sdata))
219 		return -EBUSY;
220 
221 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
222 	    !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
223 		check_dup = false;
224 
225 	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
226 	if (ret)
227 		return ret;
228 
229 	ret = eth_mac_addr(dev, sa);
230 
231 	if (ret == 0)
232 		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
233 
234 	return ret;
235 }
236 
237 static inline int identical_mac_addr_allowed(int type1, int type2)
238 {
239 	return type1 == NL80211_IFTYPE_MONITOR ||
240 		type2 == NL80211_IFTYPE_MONITOR ||
241 		type1 == NL80211_IFTYPE_P2P_DEVICE ||
242 		type2 == NL80211_IFTYPE_P2P_DEVICE ||
243 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
244 		(type1 == NL80211_IFTYPE_WDS &&
245 			(type2 == NL80211_IFTYPE_WDS ||
246 			 type2 == NL80211_IFTYPE_AP)) ||
247 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
248 		(type1 == NL80211_IFTYPE_AP_VLAN &&
249 			(type2 == NL80211_IFTYPE_AP ||
250 			 type2 == NL80211_IFTYPE_AP_VLAN));
251 }
252 
253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
254 					    enum nl80211_iftype iftype)
255 {
256 	struct ieee80211_local *local = sdata->local;
257 	struct ieee80211_sub_if_data *nsdata;
258 
259 	ASSERT_RTNL();
260 
261 	/* we hold the RTNL here so can safely walk the list */
262 	list_for_each_entry(nsdata, &local->interfaces, list) {
263 		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
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 	return 0;
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_P2P_DEVICE) {
318 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
319 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
320 					 IEEE80211_INVAL_HW_QUEUE))
321 				return -EINVAL;
322 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
323 					 n_queues))
324 				return -EINVAL;
325 		}
326 	}
327 
328 	if ((iftype != NL80211_IFTYPE_AP &&
329 	     iftype != NL80211_IFTYPE_P2P_GO &&
330 	     iftype != NL80211_IFTYPE_MESH_POINT) ||
331 	    !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
332 		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
333 		return 0;
334 	}
335 
336 	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
337 		return -EINVAL;
338 
339 	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
340 		return -EINVAL;
341 
342 	return 0;
343 }
344 
345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
346 				    const int offset)
347 {
348 	struct ieee80211_local *local = sdata->local;
349 	u32 flags = sdata->u.mntr_flags;
350 
351 #define ADJUST(_f, _s)	do {					\
352 	if (flags & MONITOR_FLAG_##_f)				\
353 		local->fif_##_s += offset;			\
354 	} while (0)
355 
356 	ADJUST(FCSFAIL, fcsfail);
357 	ADJUST(PLCPFAIL, plcpfail);
358 	ADJUST(CONTROL, control);
359 	ADJUST(CONTROL, pspoll);
360 	ADJUST(OTHER_BSS, other_bss);
361 
362 #undef ADJUST
363 }
364 
365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
366 {
367 	struct ieee80211_local *local = sdata->local;
368 	int i;
369 
370 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
371 		if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
372 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
373 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
374 			sdata->vif.hw_queue[i] = i;
375 		else
376 			sdata->vif.hw_queue[i] = 0;
377 	}
378 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
379 }
380 
381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
382 {
383 	struct ieee80211_sub_if_data *sdata;
384 	int ret;
385 
386 	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
387 		return 0;
388 
389 	ASSERT_RTNL();
390 
391 	if (local->monitor_sdata)
392 		return 0;
393 
394 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
395 	if (!sdata)
396 		return -ENOMEM;
397 
398 	/* set up data */
399 	sdata->local = local;
400 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
401 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
402 		 wiphy_name(local->hw.wiphy));
403 
404 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
405 
406 	ieee80211_set_default_queues(sdata);
407 
408 	ret = drv_add_interface(local, sdata);
409 	if (WARN_ON(ret)) {
410 		/* ok .. stupid driver, it asked for this! */
411 		kfree(sdata);
412 		return ret;
413 	}
414 
415 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
416 	if (ret) {
417 		kfree(sdata);
418 		return ret;
419 	}
420 
421 	mutex_lock(&local->mtx);
422 	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
423 					IEEE80211_CHANCTX_EXCLUSIVE);
424 	mutex_unlock(&local->mtx);
425 	if (ret) {
426 		drv_remove_interface(local, sdata);
427 		kfree(sdata);
428 		return ret;
429 	}
430 
431 	mutex_lock(&local->iflist_mtx);
432 	rcu_assign_pointer(local->monitor_sdata, sdata);
433 	mutex_unlock(&local->iflist_mtx);
434 
435 	return 0;
436 }
437 
438 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
439 {
440 	struct ieee80211_sub_if_data *sdata;
441 
442 	if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
443 		return;
444 
445 	ASSERT_RTNL();
446 
447 	mutex_lock(&local->iflist_mtx);
448 
449 	sdata = rcu_dereference_protected(local->monitor_sdata,
450 					  lockdep_is_held(&local->iflist_mtx));
451 	if (!sdata) {
452 		mutex_unlock(&local->iflist_mtx);
453 		return;
454 	}
455 
456 	rcu_assign_pointer(local->monitor_sdata, NULL);
457 	mutex_unlock(&local->iflist_mtx);
458 
459 	synchronize_net();
460 
461 	mutex_lock(&local->mtx);
462 	ieee80211_vif_release_channel(sdata);
463 	mutex_unlock(&local->mtx);
464 
465 	drv_remove_interface(local, sdata);
466 
467 	kfree(sdata);
468 }
469 
470 /*
471  * NOTE: Be very careful when changing this function, it must NOT return
472  * an error on interface type changes that have been pre-checked, so most
473  * checks should be in ieee80211_check_concurrent_iface.
474  */
475 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
476 {
477 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
478 	struct net_device *dev = wdev->netdev;
479 	struct ieee80211_local *local = sdata->local;
480 	struct sta_info *sta;
481 	u32 changed = 0;
482 	int res;
483 	u32 hw_reconf_flags = 0;
484 
485 	switch (sdata->vif.type) {
486 	case NL80211_IFTYPE_WDS:
487 		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
488 			return -ENOLINK;
489 		break;
490 	case NL80211_IFTYPE_AP_VLAN: {
491 		struct ieee80211_sub_if_data *master;
492 
493 		if (!sdata->bss)
494 			return -ENOLINK;
495 
496 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
497 
498 		master = container_of(sdata->bss,
499 				      struct ieee80211_sub_if_data, u.ap);
500 		sdata->control_port_protocol =
501 			master->control_port_protocol;
502 		sdata->control_port_no_encrypt =
503 			master->control_port_no_encrypt;
504 		sdata->vif.cab_queue = master->vif.cab_queue;
505 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
506 		       sizeof(sdata->vif.hw_queue));
507 		break;
508 		}
509 	case NL80211_IFTYPE_AP:
510 		sdata->bss = &sdata->u.ap;
511 		break;
512 	case NL80211_IFTYPE_MESH_POINT:
513 	case NL80211_IFTYPE_STATION:
514 	case NL80211_IFTYPE_MONITOR:
515 	case NL80211_IFTYPE_ADHOC:
516 	case NL80211_IFTYPE_P2P_DEVICE:
517 		/* no special treatment */
518 		break;
519 	case NL80211_IFTYPE_UNSPECIFIED:
520 	case NUM_NL80211_IFTYPES:
521 	case NL80211_IFTYPE_P2P_CLIENT:
522 	case NL80211_IFTYPE_P2P_GO:
523 		/* cannot happen */
524 		WARN_ON(1);
525 		break;
526 	}
527 
528 	if (local->open_count == 0) {
529 		res = drv_start(local);
530 		if (res)
531 			goto err_del_bss;
532 		/* we're brought up, everything changes */
533 		hw_reconf_flags = ~0;
534 		ieee80211_led_radio(local, true);
535 		ieee80211_mod_tpt_led_trig(local,
536 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
537 	}
538 
539 	/*
540 	 * Copy the hopefully now-present MAC address to
541 	 * this interface, if it has the special null one.
542 	 */
543 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
544 		memcpy(dev->dev_addr,
545 		       local->hw.wiphy->perm_addr,
546 		       ETH_ALEN);
547 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
548 
549 		if (!is_valid_ether_addr(dev->dev_addr)) {
550 			res = -EADDRNOTAVAIL;
551 			goto err_stop;
552 		}
553 	}
554 
555 	switch (sdata->vif.type) {
556 	case NL80211_IFTYPE_AP_VLAN:
557 		/* no need to tell driver, but set carrier and chanctx */
558 		if (rtnl_dereference(sdata->bss->beacon)) {
559 			ieee80211_vif_vlan_copy_chanctx(sdata);
560 			netif_carrier_on(dev);
561 		} else {
562 			netif_carrier_off(dev);
563 		}
564 		break;
565 	case NL80211_IFTYPE_MONITOR:
566 		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
567 			local->cooked_mntrs++;
568 			break;
569 		}
570 
571 		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
572 			res = drv_add_interface(local, sdata);
573 			if (res)
574 				goto err_stop;
575 		} else if (local->monitors == 0 && local->open_count == 0) {
576 			res = ieee80211_add_virtual_monitor(local);
577 			if (res)
578 				goto err_stop;
579 		}
580 
581 		/* must be before the call to ieee80211_configure_filter */
582 		local->monitors++;
583 		if (local->monitors == 1) {
584 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
585 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
586 		}
587 
588 		ieee80211_adjust_monitor_flags(sdata, 1);
589 		ieee80211_configure_filter(local);
590 		mutex_lock(&local->mtx);
591 		ieee80211_recalc_idle(local);
592 		mutex_unlock(&local->mtx);
593 
594 		netif_carrier_on(dev);
595 		break;
596 	default:
597 		if (coming_up) {
598 			ieee80211_del_virtual_monitor(local);
599 
600 			res = drv_add_interface(local, sdata);
601 			if (res)
602 				goto err_stop;
603 			res = ieee80211_check_queues(sdata,
604 				ieee80211_vif_type_p2p(&sdata->vif));
605 			if (res)
606 				goto err_del_interface;
607 		}
608 
609 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
610 			local->fif_pspoll++;
611 			local->fif_probe_req++;
612 
613 			ieee80211_configure_filter(local);
614 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
615 			local->fif_probe_req++;
616 		}
617 
618 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
619 			changed |= ieee80211_reset_erp_info(sdata);
620 		ieee80211_bss_info_change_notify(sdata, changed);
621 
622 		switch (sdata->vif.type) {
623 		case NL80211_IFTYPE_STATION:
624 		case NL80211_IFTYPE_ADHOC:
625 		case NL80211_IFTYPE_AP:
626 		case NL80211_IFTYPE_MESH_POINT:
627 			netif_carrier_off(dev);
628 			break;
629 		case NL80211_IFTYPE_WDS:
630 		case NL80211_IFTYPE_P2P_DEVICE:
631 			break;
632 		default:
633 			/* not reached */
634 			WARN_ON(1);
635 		}
636 
637 		/*
638 		 * set default queue parameters so drivers don't
639 		 * need to initialise the hardware if the hardware
640 		 * doesn't start up with sane defaults
641 		 */
642 		ieee80211_set_wmm_default(sdata, true);
643 	}
644 
645 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
646 
647 	if (sdata->vif.type == NL80211_IFTYPE_WDS) {
648 		/* Create STA entry for the WDS peer */
649 		sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
650 				     GFP_KERNEL);
651 		if (!sta) {
652 			res = -ENOMEM;
653 			goto err_del_interface;
654 		}
655 
656 		sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
657 		sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
658 		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
659 
660 		res = sta_info_insert(sta);
661 		if (res) {
662 			/* STA has been freed */
663 			goto err_del_interface;
664 		}
665 
666 		rate_control_rate_init(sta);
667 		netif_carrier_on(dev);
668 	} else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
669 		rcu_assign_pointer(local->p2p_sdata, sdata);
670 	}
671 
672 	/*
673 	 * set_multicast_list will be invoked by the networking core
674 	 * which will check whether any increments here were done in
675 	 * error and sync them down to the hardware as filter flags.
676 	 */
677 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
678 		atomic_inc(&local->iff_allmultis);
679 
680 	if (sdata->flags & IEEE80211_SDATA_PROMISC)
681 		atomic_inc(&local->iff_promiscs);
682 
683 	if (coming_up)
684 		local->open_count++;
685 
686 	if (hw_reconf_flags)
687 		ieee80211_hw_config(local, hw_reconf_flags);
688 
689 	ieee80211_recalc_ps(local, -1);
690 
691 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
692 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
693 		/* XXX: for AP_VLAN, actually track AP queues */
694 		netif_tx_start_all_queues(dev);
695 	} else if (dev) {
696 		unsigned long flags;
697 		int n_acs = IEEE80211_NUM_ACS;
698 		int ac;
699 
700 		if (local->hw.queues < IEEE80211_NUM_ACS)
701 			n_acs = 1;
702 
703 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
704 		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
705 		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
706 		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
707 			for (ac = 0; ac < n_acs; ac++) {
708 				int ac_queue = sdata->vif.hw_queue[ac];
709 
710 				if (local->queue_stop_reasons[ac_queue] == 0 &&
711 				    skb_queue_empty(&local->pending[ac_queue]))
712 					netif_start_subqueue(dev, ac);
713 			}
714 		}
715 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
716 	}
717 
718 	return 0;
719  err_del_interface:
720 	drv_remove_interface(local, sdata);
721  err_stop:
722 	if (!local->open_count)
723 		drv_stop(local);
724  err_del_bss:
725 	sdata->bss = NULL;
726 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
727 		list_del(&sdata->u.vlan.list);
728 	/* might already be clear but that doesn't matter */
729 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
730 	return res;
731 }
732 
733 static int ieee80211_open(struct net_device *dev)
734 {
735 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
736 	int err;
737 
738 	/* fail early if user set an invalid address */
739 	if (!is_valid_ether_addr(dev->dev_addr))
740 		return -EADDRNOTAVAIL;
741 
742 	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
743 	if (err)
744 		return err;
745 
746 	return ieee80211_do_open(&sdata->wdev, true);
747 }
748 
749 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
750 			      bool going_down)
751 {
752 	struct ieee80211_local *local = sdata->local;
753 	unsigned long flags;
754 	struct sk_buff *skb, *tmp;
755 	u32 hw_reconf_flags = 0;
756 	int i, flushed;
757 	struct ps_data *ps;
758 	struct cfg80211_chan_def chandef;
759 
760 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
761 
762 	if (rcu_access_pointer(local->scan_sdata) == sdata)
763 		ieee80211_scan_cancel(local);
764 
765 	/*
766 	 * Stop TX on this interface first.
767 	 */
768 	if (sdata->dev)
769 		netif_tx_stop_all_queues(sdata->dev);
770 
771 	ieee80211_roc_purge(local, sdata);
772 
773 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
774 		ieee80211_mgd_stop(sdata);
775 
776 	if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
777 		ieee80211_ibss_stop(sdata);
778 
779 
780 	/*
781 	 * Remove all stations associated with this interface.
782 	 *
783 	 * This must be done before calling ops->remove_interface()
784 	 * because otherwise we can later invoke ops->sta_notify()
785 	 * whenever the STAs are removed, and that invalidates driver
786 	 * assumptions about always getting a vif pointer that is valid
787 	 * (because if we remove a STA after ops->remove_interface()
788 	 * the driver will have removed the vif info already!)
789 	 *
790 	 * This is relevant only in WDS mode, in all other modes we've
791 	 * already removed all stations when disconnecting or similar,
792 	 * so warn otherwise.
793 	 */
794 	flushed = sta_info_flush(sdata);
795 	WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
796 		     (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
797 
798 	/* don't count this interface for promisc/allmulti while it is down */
799 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
800 		atomic_dec(&local->iff_allmultis);
801 
802 	if (sdata->flags & IEEE80211_SDATA_PROMISC)
803 		atomic_dec(&local->iff_promiscs);
804 
805 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
806 		local->fif_pspoll--;
807 		local->fif_probe_req--;
808 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
809 		local->fif_probe_req--;
810 	}
811 
812 	if (sdata->dev) {
813 		netif_addr_lock_bh(sdata->dev);
814 		spin_lock_bh(&local->filter_lock);
815 		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
816 				 sdata->dev->addr_len);
817 		spin_unlock_bh(&local->filter_lock);
818 		netif_addr_unlock_bh(sdata->dev);
819 	}
820 
821 	del_timer_sync(&local->dynamic_ps_timer);
822 	cancel_work_sync(&local->dynamic_ps_enable_work);
823 
824 	cancel_work_sync(&sdata->recalc_smps);
825 	sdata->vif.csa_active = false;
826 	cancel_work_sync(&sdata->csa_finalize_work);
827 
828 	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
829 
830 	if (sdata->wdev.cac_started) {
831 		chandef = sdata->vif.bss_conf.chandef;
832 		WARN_ON(local->suspended);
833 		mutex_lock(&local->mtx);
834 		ieee80211_vif_release_channel(sdata);
835 		mutex_unlock(&local->mtx);
836 		cfg80211_cac_event(sdata->dev, &chandef,
837 				   NL80211_RADAR_CAC_ABORTED,
838 				   GFP_KERNEL);
839 	}
840 
841 	/* APs need special treatment */
842 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
843 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
844 
845 		/* down all dependent devices, that is VLANs */
846 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
847 					 u.vlan.list)
848 			dev_close(vlan->dev);
849 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
850 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
851 		/* remove all packets in parent bc_buf pointing to this dev */
852 		ps = &sdata->bss->ps;
853 
854 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
855 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
856 			if (skb->dev == sdata->dev) {
857 				__skb_unlink(skb, &ps->bc_buf);
858 				local->total_ps_buffered--;
859 				ieee80211_free_txskb(&local->hw, skb);
860 			}
861 		}
862 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
863 	}
864 
865 	if (going_down)
866 		local->open_count--;
867 
868 	switch (sdata->vif.type) {
869 	case NL80211_IFTYPE_AP_VLAN:
870 		list_del(&sdata->u.vlan.list);
871 		rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
872 		/* no need to tell driver */
873 		break;
874 	case NL80211_IFTYPE_MONITOR:
875 		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
876 			local->cooked_mntrs--;
877 			break;
878 		}
879 
880 		local->monitors--;
881 		if (local->monitors == 0) {
882 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
883 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
884 		}
885 
886 		ieee80211_adjust_monitor_flags(sdata, -1);
887 		break;
888 	case NL80211_IFTYPE_P2P_DEVICE:
889 		/* relies on synchronize_rcu() below */
890 		rcu_assign_pointer(local->p2p_sdata, NULL);
891 		/* fall through */
892 	default:
893 		cancel_work_sync(&sdata->work);
894 		/*
895 		 * When we get here, the interface is marked down.
896 		 * Free the remaining keys, if there are any
897 		 * (shouldn't be, except maybe in WDS mode?)
898 		 *
899 		 * Force the key freeing to always synchronize_net()
900 		 * to wait for the RX path in case it is using this
901 		 * interface enqueuing frames * at this very time on
902 		 * another CPU.
903 		 */
904 		ieee80211_free_keys(sdata, true);
905 
906 		/* fall through */
907 	case NL80211_IFTYPE_AP:
908 		skb_queue_purge(&sdata->skb_queue);
909 	}
910 
911 	sdata->bss = NULL;
912 
913 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
914 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
915 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
916 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
917 			if (info->control.vif == &sdata->vif) {
918 				__skb_unlink(skb, &local->pending[i]);
919 				ieee80211_free_txskb(&local->hw, skb);
920 			}
921 		}
922 	}
923 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
924 
925 	if (local->open_count == 0)
926 		ieee80211_clear_tx_pending(local);
927 
928 	/*
929 	 * If the interface goes down while suspended, presumably because
930 	 * the device was unplugged and that happens before our resume,
931 	 * then the driver is already unconfigured and the remainder of
932 	 * this function isn't needed.
933 	 * XXX: what about WoWLAN? If the device has software state, e.g.
934 	 *	memory allocated, it might expect teardown commands from
935 	 *	mac80211 here?
936 	 */
937 	if (local->suspended) {
938 		WARN_ON(local->wowlan);
939 		WARN_ON(rtnl_dereference(local->monitor_sdata));
940 		return;
941 	}
942 
943 	switch (sdata->vif.type) {
944 	case NL80211_IFTYPE_AP_VLAN:
945 		break;
946 	case NL80211_IFTYPE_MONITOR:
947 		if (local->monitors == 0)
948 			ieee80211_del_virtual_monitor(local);
949 
950 		mutex_lock(&local->mtx);
951 		ieee80211_recalc_idle(local);
952 		mutex_unlock(&local->mtx);
953 
954 		if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
955 			break;
956 
957 		/* fall through */
958 	default:
959 		if (going_down)
960 			drv_remove_interface(local, sdata);
961 	}
962 
963 	ieee80211_recalc_ps(local, -1);
964 
965 	if (local->open_count == 0) {
966 		ieee80211_stop_device(local);
967 
968 		/* no reconfiguring after stop! */
969 		return;
970 	}
971 
972 	/* do after stop to avoid reconfiguring when we stop anyway */
973 	ieee80211_configure_filter(local);
974 	ieee80211_hw_config(local, hw_reconf_flags);
975 
976 	if (local->monitors == local->open_count)
977 		ieee80211_add_virtual_monitor(local);
978 }
979 
980 static int ieee80211_stop(struct net_device *dev)
981 {
982 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
983 
984 	ieee80211_do_stop(sdata, true);
985 
986 	return 0;
987 }
988 
989 static void ieee80211_set_multicast_list(struct net_device *dev)
990 {
991 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
992 	struct ieee80211_local *local = sdata->local;
993 	int allmulti, promisc, sdata_allmulti, sdata_promisc;
994 
995 	allmulti = !!(dev->flags & IFF_ALLMULTI);
996 	promisc = !!(dev->flags & IFF_PROMISC);
997 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
998 	sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
999 
1000 	if (allmulti != sdata_allmulti) {
1001 		if (dev->flags & IFF_ALLMULTI)
1002 			atomic_inc(&local->iff_allmultis);
1003 		else
1004 			atomic_dec(&local->iff_allmultis);
1005 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1006 	}
1007 
1008 	if (promisc != sdata_promisc) {
1009 		if (dev->flags & IFF_PROMISC)
1010 			atomic_inc(&local->iff_promiscs);
1011 		else
1012 			atomic_dec(&local->iff_promiscs);
1013 		sdata->flags ^= IEEE80211_SDATA_PROMISC;
1014 	}
1015 	spin_lock_bh(&local->filter_lock);
1016 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1017 	spin_unlock_bh(&local->filter_lock);
1018 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1019 }
1020 
1021 /*
1022  * Called when the netdev is removed or, by the code below, before
1023  * the interface type changes.
1024  */
1025 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1026 {
1027 	int i;
1028 
1029 	/* free extra data */
1030 	ieee80211_free_keys(sdata, false);
1031 
1032 	ieee80211_debugfs_remove_netdev(sdata);
1033 
1034 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1035 		__skb_queue_purge(&sdata->fragments[i].skb_list);
1036 	sdata->fragment_next = 0;
1037 
1038 	if (ieee80211_vif_is_mesh(&sdata->vif))
1039 		mesh_rmc_free(sdata);
1040 }
1041 
1042 static void ieee80211_uninit(struct net_device *dev)
1043 {
1044 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1045 }
1046 
1047 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1048 					 struct sk_buff *skb,
1049 					 void *accel_priv)
1050 {
1051 	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1052 }
1053 
1054 static const struct net_device_ops ieee80211_dataif_ops = {
1055 	.ndo_open		= ieee80211_open,
1056 	.ndo_stop		= ieee80211_stop,
1057 	.ndo_uninit		= ieee80211_uninit,
1058 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
1059 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1060 	.ndo_change_mtu 	= ieee80211_change_mtu,
1061 	.ndo_set_mac_address 	= ieee80211_change_mac,
1062 	.ndo_select_queue	= ieee80211_netdev_select_queue,
1063 };
1064 
1065 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1066 					  struct sk_buff *skb,
1067 					  void *accel_priv)
1068 {
1069 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1070 	struct ieee80211_local *local = sdata->local;
1071 	struct ieee80211_hdr *hdr;
1072 	struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1073 
1074 	if (local->hw.queues < IEEE80211_NUM_ACS)
1075 		return 0;
1076 
1077 	if (skb->len < 4 ||
1078 	    skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1079 		return 0; /* doesn't matter, frame will be dropped */
1080 
1081 	hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1082 
1083 	return ieee80211_select_queue_80211(sdata, skb, hdr);
1084 }
1085 
1086 static const struct net_device_ops ieee80211_monitorif_ops = {
1087 	.ndo_open		= ieee80211_open,
1088 	.ndo_stop		= ieee80211_stop,
1089 	.ndo_uninit		= ieee80211_uninit,
1090 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
1091 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1092 	.ndo_change_mtu 	= ieee80211_change_mtu,
1093 	.ndo_set_mac_address 	= ieee80211_change_mac,
1094 	.ndo_select_queue	= ieee80211_monitor_select_queue,
1095 };
1096 
1097 static void ieee80211_if_setup(struct net_device *dev)
1098 {
1099 	ether_setup(dev);
1100 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1101 	dev->netdev_ops = &ieee80211_dataif_ops;
1102 	dev->destructor = free_netdev;
1103 }
1104 
1105 static void ieee80211_iface_work(struct work_struct *work)
1106 {
1107 	struct ieee80211_sub_if_data *sdata =
1108 		container_of(work, struct ieee80211_sub_if_data, work);
1109 	struct ieee80211_local *local = sdata->local;
1110 	struct sk_buff *skb;
1111 	struct sta_info *sta;
1112 	struct ieee80211_ra_tid *ra_tid;
1113 
1114 	if (!ieee80211_sdata_running(sdata))
1115 		return;
1116 
1117 	if (local->scanning)
1118 		return;
1119 
1120 	/*
1121 	 * ieee80211_queue_work() should have picked up most cases,
1122 	 * here we'll pick the rest.
1123 	 */
1124 	if (WARN(local->suspended,
1125 		 "interface work scheduled while going to suspend\n"))
1126 		return;
1127 
1128 	/* first process frames */
1129 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1130 		struct ieee80211_mgmt *mgmt = (void *)skb->data;
1131 
1132 		if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1133 			ra_tid = (void *)&skb->cb;
1134 			ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1135 						 ra_tid->tid);
1136 		} else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1137 			ra_tid = (void *)&skb->cb;
1138 			ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1139 						ra_tid->tid);
1140 		} else if (ieee80211_is_action(mgmt->frame_control) &&
1141 			   mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1142 			int len = skb->len;
1143 
1144 			mutex_lock(&local->sta_mtx);
1145 			sta = sta_info_get_bss(sdata, mgmt->sa);
1146 			if (sta) {
1147 				switch (mgmt->u.action.u.addba_req.action_code) {
1148 				case WLAN_ACTION_ADDBA_REQ:
1149 					ieee80211_process_addba_request(
1150 							local, sta, mgmt, len);
1151 					break;
1152 				case WLAN_ACTION_ADDBA_RESP:
1153 					ieee80211_process_addba_resp(local, sta,
1154 								     mgmt, len);
1155 					break;
1156 				case WLAN_ACTION_DELBA:
1157 					ieee80211_process_delba(sdata, sta,
1158 								mgmt, len);
1159 					break;
1160 				default:
1161 					WARN_ON(1);
1162 					break;
1163 				}
1164 			}
1165 			mutex_unlock(&local->sta_mtx);
1166 		} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1167 			struct ieee80211_hdr *hdr = (void *)mgmt;
1168 			/*
1169 			 * So the frame isn't mgmt, but frame_control
1170 			 * is at the right place anyway, of course, so
1171 			 * the if statement is correct.
1172 			 *
1173 			 * Warn if we have other data frame types here,
1174 			 * they must not get here.
1175 			 */
1176 			WARN_ON(hdr->frame_control &
1177 					cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1178 			WARN_ON(!(hdr->seq_ctrl &
1179 					cpu_to_le16(IEEE80211_SCTL_FRAG)));
1180 			/*
1181 			 * This was a fragment of a frame, received while
1182 			 * a block-ack session was active. That cannot be
1183 			 * right, so terminate the session.
1184 			 */
1185 			mutex_lock(&local->sta_mtx);
1186 			sta = sta_info_get_bss(sdata, mgmt->sa);
1187 			if (sta) {
1188 				u16 tid = *ieee80211_get_qos_ctl(hdr) &
1189 						IEEE80211_QOS_CTL_TID_MASK;
1190 
1191 				__ieee80211_stop_rx_ba_session(
1192 					sta, tid, WLAN_BACK_RECIPIENT,
1193 					WLAN_REASON_QSTA_REQUIRE_SETUP,
1194 					true);
1195 			}
1196 			mutex_unlock(&local->sta_mtx);
1197 		} else switch (sdata->vif.type) {
1198 		case NL80211_IFTYPE_STATION:
1199 			ieee80211_sta_rx_queued_mgmt(sdata, skb);
1200 			break;
1201 		case NL80211_IFTYPE_ADHOC:
1202 			ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1203 			break;
1204 		case NL80211_IFTYPE_MESH_POINT:
1205 			if (!ieee80211_vif_is_mesh(&sdata->vif))
1206 				break;
1207 			ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1208 			break;
1209 		default:
1210 			WARN(1, "frame for unexpected interface type");
1211 			break;
1212 		}
1213 
1214 		kfree_skb(skb);
1215 	}
1216 
1217 	/* then other type-dependent work */
1218 	switch (sdata->vif.type) {
1219 	case NL80211_IFTYPE_STATION:
1220 		ieee80211_sta_work(sdata);
1221 		break;
1222 	case NL80211_IFTYPE_ADHOC:
1223 		ieee80211_ibss_work(sdata);
1224 		break;
1225 	case NL80211_IFTYPE_MESH_POINT:
1226 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1227 			break;
1228 		ieee80211_mesh_work(sdata);
1229 		break;
1230 	default:
1231 		break;
1232 	}
1233 }
1234 
1235 static void ieee80211_recalc_smps_work(struct work_struct *work)
1236 {
1237 	struct ieee80211_sub_if_data *sdata =
1238 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1239 
1240 	ieee80211_recalc_smps(sdata);
1241 }
1242 
1243 /*
1244  * Helper function to initialise an interface to a specific type.
1245  */
1246 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1247 				  enum nl80211_iftype type)
1248 {
1249 	/* clear type-dependent union */
1250 	memset(&sdata->u, 0, sizeof(sdata->u));
1251 
1252 	/* and set some type-dependent values */
1253 	sdata->vif.type = type;
1254 	sdata->vif.p2p = false;
1255 	sdata->wdev.iftype = type;
1256 
1257 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1258 	sdata->control_port_no_encrypt = false;
1259 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1260 
1261 	sdata->noack_map = 0;
1262 
1263 	/* only monitor/p2p-device differ */
1264 	if (sdata->dev) {
1265 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1266 		sdata->dev->type = ARPHRD_ETHER;
1267 	}
1268 
1269 	skb_queue_head_init(&sdata->skb_queue);
1270 	INIT_WORK(&sdata->work, ieee80211_iface_work);
1271 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1272 	INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1273 
1274 	switch (type) {
1275 	case NL80211_IFTYPE_P2P_GO:
1276 		type = NL80211_IFTYPE_AP;
1277 		sdata->vif.type = type;
1278 		sdata->vif.p2p = true;
1279 		/* fall through */
1280 	case NL80211_IFTYPE_AP:
1281 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1282 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1283 		INIT_WORK(&sdata->u.ap.request_smps_work,
1284 			  ieee80211_request_smps_ap_work);
1285 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1286 		sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1287 		break;
1288 	case NL80211_IFTYPE_P2P_CLIENT:
1289 		type = NL80211_IFTYPE_STATION;
1290 		sdata->vif.type = type;
1291 		sdata->vif.p2p = true;
1292 		/* fall through */
1293 	case NL80211_IFTYPE_STATION:
1294 		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1295 		ieee80211_sta_setup_sdata(sdata);
1296 		break;
1297 	case NL80211_IFTYPE_ADHOC:
1298 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1299 		ieee80211_ibss_setup_sdata(sdata);
1300 		break;
1301 	case NL80211_IFTYPE_MESH_POINT:
1302 		if (ieee80211_vif_is_mesh(&sdata->vif))
1303 			ieee80211_mesh_init_sdata(sdata);
1304 		break;
1305 	case NL80211_IFTYPE_MONITOR:
1306 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1307 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1308 		sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1309 				      MONITOR_FLAG_OTHER_BSS;
1310 		break;
1311 	case NL80211_IFTYPE_WDS:
1312 		sdata->vif.bss_conf.bssid = NULL;
1313 		break;
1314 	case NL80211_IFTYPE_AP_VLAN:
1315 	case NL80211_IFTYPE_P2P_DEVICE:
1316 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1317 		break;
1318 	case NL80211_IFTYPE_UNSPECIFIED:
1319 	case NUM_NL80211_IFTYPES:
1320 		BUG();
1321 		break;
1322 	}
1323 
1324 	ieee80211_debugfs_add_netdev(sdata);
1325 }
1326 
1327 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1328 					   enum nl80211_iftype type)
1329 {
1330 	struct ieee80211_local *local = sdata->local;
1331 	int ret, err;
1332 	enum nl80211_iftype internal_type = type;
1333 	bool p2p = false;
1334 
1335 	ASSERT_RTNL();
1336 
1337 	if (!local->ops->change_interface)
1338 		return -EBUSY;
1339 
1340 	switch (sdata->vif.type) {
1341 	case NL80211_IFTYPE_AP:
1342 	case NL80211_IFTYPE_STATION:
1343 	case NL80211_IFTYPE_ADHOC:
1344 		/*
1345 		 * Could maybe also all others here?
1346 		 * Just not sure how that interacts
1347 		 * with the RX/config path e.g. for
1348 		 * mesh.
1349 		 */
1350 		break;
1351 	default:
1352 		return -EBUSY;
1353 	}
1354 
1355 	switch (type) {
1356 	case NL80211_IFTYPE_AP:
1357 	case NL80211_IFTYPE_STATION:
1358 	case NL80211_IFTYPE_ADHOC:
1359 		/*
1360 		 * Could probably support everything
1361 		 * but WDS here (WDS do_open can fail
1362 		 * under memory pressure, which this
1363 		 * code isn't prepared to handle).
1364 		 */
1365 		break;
1366 	case NL80211_IFTYPE_P2P_CLIENT:
1367 		p2p = true;
1368 		internal_type = NL80211_IFTYPE_STATION;
1369 		break;
1370 	case NL80211_IFTYPE_P2P_GO:
1371 		p2p = true;
1372 		internal_type = NL80211_IFTYPE_AP;
1373 		break;
1374 	default:
1375 		return -EBUSY;
1376 	}
1377 
1378 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1379 	if (ret)
1380 		return ret;
1381 
1382 	ieee80211_do_stop(sdata, false);
1383 
1384 	ieee80211_teardown_sdata(sdata);
1385 
1386 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1387 	if (ret)
1388 		type = ieee80211_vif_type_p2p(&sdata->vif);
1389 
1390 	/*
1391 	 * Ignore return value here, there's not much we can do since
1392 	 * the driver changed the interface type internally already.
1393 	 * The warnings will hopefully make driver authors fix it :-)
1394 	 */
1395 	ieee80211_check_queues(sdata, type);
1396 
1397 	ieee80211_setup_sdata(sdata, type);
1398 
1399 	err = ieee80211_do_open(&sdata->wdev, false);
1400 	WARN(err, "type change: do_open returned %d", err);
1401 
1402 	return ret;
1403 }
1404 
1405 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1406 			     enum nl80211_iftype type)
1407 {
1408 	int ret;
1409 
1410 	ASSERT_RTNL();
1411 
1412 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1413 		return 0;
1414 
1415 	if (ieee80211_sdata_running(sdata)) {
1416 		ret = ieee80211_runtime_change_iftype(sdata, type);
1417 		if (ret)
1418 			return ret;
1419 	} else {
1420 		/* Purge and reset type-dependent state. */
1421 		ieee80211_teardown_sdata(sdata);
1422 		ieee80211_setup_sdata(sdata, type);
1423 	}
1424 
1425 	/* reset some values that shouldn't be kept across type changes */
1426 	sdata->drop_unencrypted = 0;
1427 	if (type == NL80211_IFTYPE_STATION)
1428 		sdata->u.mgd.use_4addr = false;
1429 
1430 	return 0;
1431 }
1432 
1433 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1434 				       u8 *perm_addr, enum nl80211_iftype type)
1435 {
1436 	struct ieee80211_sub_if_data *sdata;
1437 	u64 mask, start, addr, val, inc;
1438 	u8 *m;
1439 	u8 tmp_addr[ETH_ALEN];
1440 	int i;
1441 
1442 	/* default ... something at least */
1443 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1444 
1445 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1446 	    local->hw.wiphy->n_addresses <= 1)
1447 		return;
1448 
1449 	mutex_lock(&local->iflist_mtx);
1450 
1451 	switch (type) {
1452 	case NL80211_IFTYPE_MONITOR:
1453 		/* doesn't matter */
1454 		break;
1455 	case NL80211_IFTYPE_WDS:
1456 	case NL80211_IFTYPE_AP_VLAN:
1457 		/* match up with an AP interface */
1458 		list_for_each_entry(sdata, &local->interfaces, list) {
1459 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1460 				continue;
1461 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1462 			break;
1463 		}
1464 		/* keep default if no AP interface present */
1465 		break;
1466 	case NL80211_IFTYPE_P2P_CLIENT:
1467 	case NL80211_IFTYPE_P2P_GO:
1468 		if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1469 			list_for_each_entry(sdata, &local->interfaces, list) {
1470 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1471 					continue;
1472 				if (!ieee80211_sdata_running(sdata))
1473 					continue;
1474 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1475 				goto out_unlock;
1476 			}
1477 		}
1478 		/* otherwise fall through */
1479 	default:
1480 		/* assign a new address if possible -- try n_addresses first */
1481 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1482 			bool used = false;
1483 
1484 			list_for_each_entry(sdata, &local->interfaces, list) {
1485 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1486 						     sdata->vif.addr)) {
1487 					used = true;
1488 					break;
1489 				}
1490 			}
1491 
1492 			if (!used) {
1493 				memcpy(perm_addr,
1494 				       local->hw.wiphy->addresses[i].addr,
1495 				       ETH_ALEN);
1496 				break;
1497 			}
1498 		}
1499 
1500 		/* try mask if available */
1501 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1502 			break;
1503 
1504 		m = local->hw.wiphy->addr_mask;
1505 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1506 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1507 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1508 
1509 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1510 			/* not a contiguous mask ... not handled now! */
1511 			pr_info("not contiguous\n");
1512 			break;
1513 		}
1514 
1515 		/*
1516 		 * Pick address of existing interface in case user changed
1517 		 * MAC address manually, default to perm_addr.
1518 		 */
1519 		m = local->hw.wiphy->perm_addr;
1520 		list_for_each_entry(sdata, &local->interfaces, list) {
1521 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1522 				continue;
1523 			m = sdata->vif.addr;
1524 			break;
1525 		}
1526 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1527 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1528 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1529 
1530 		inc = 1ULL<<__ffs64(mask);
1531 		val = (start & mask);
1532 		addr = (start & ~mask) | (val & mask);
1533 		do {
1534 			bool used = false;
1535 
1536 			tmp_addr[5] = addr >> 0*8;
1537 			tmp_addr[4] = addr >> 1*8;
1538 			tmp_addr[3] = addr >> 2*8;
1539 			tmp_addr[2] = addr >> 3*8;
1540 			tmp_addr[1] = addr >> 4*8;
1541 			tmp_addr[0] = addr >> 5*8;
1542 
1543 			val += inc;
1544 
1545 			list_for_each_entry(sdata, &local->interfaces, list) {
1546 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1547 					used = true;
1548 					break;
1549 				}
1550 			}
1551 
1552 			if (!used) {
1553 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1554 				break;
1555 			}
1556 			addr = (start & ~mask) | (val & mask);
1557 		} while (addr != start);
1558 
1559 		break;
1560 	}
1561 
1562  out_unlock:
1563 	mutex_unlock(&local->iflist_mtx);
1564 }
1565 
1566 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1567 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1568 		     struct vif_params *params)
1569 {
1570 	struct net_device *ndev = NULL;
1571 	struct ieee80211_sub_if_data *sdata = NULL;
1572 	int ret, i;
1573 	int txqs = 1;
1574 
1575 	ASSERT_RTNL();
1576 
1577 	if (type == NL80211_IFTYPE_P2P_DEVICE) {
1578 		struct wireless_dev *wdev;
1579 
1580 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1581 				GFP_KERNEL);
1582 		if (!sdata)
1583 			return -ENOMEM;
1584 		wdev = &sdata->wdev;
1585 
1586 		sdata->dev = NULL;
1587 		strlcpy(sdata->name, name, IFNAMSIZ);
1588 		ieee80211_assign_perm_addr(local, wdev->address, type);
1589 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1590 	} else {
1591 		if (local->hw.queues >= IEEE80211_NUM_ACS)
1592 			txqs = IEEE80211_NUM_ACS;
1593 
1594 		ndev = alloc_netdev_mqs(sizeof(*sdata) +
1595 					local->hw.vif_data_size,
1596 					name, ieee80211_if_setup, txqs, 1);
1597 		if (!ndev)
1598 			return -ENOMEM;
1599 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1600 
1601 		ndev->needed_headroom = local->tx_headroom +
1602 					4*6 /* four MAC addresses */
1603 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1604 					+ 6 /* mesh */
1605 					+ 8 /* rfc1042/bridge tunnel */
1606 					- ETH_HLEN /* ethernet hard_header_len */
1607 					+ IEEE80211_ENCRYPT_HEADROOM;
1608 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1609 
1610 		ret = dev_alloc_name(ndev, ndev->name);
1611 		if (ret < 0) {
1612 			free_netdev(ndev);
1613 			return ret;
1614 		}
1615 
1616 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1617 		memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1618 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1619 
1620 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1621 		sdata = netdev_priv(ndev);
1622 		ndev->ieee80211_ptr = &sdata->wdev;
1623 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1624 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
1625 
1626 		sdata->dev = ndev;
1627 	}
1628 
1629 	/* initialise type-independent data */
1630 	sdata->wdev.wiphy = local->hw.wiphy;
1631 	sdata->local = local;
1632 
1633 	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1634 		skb_queue_head_init(&sdata->fragments[i].skb_list);
1635 
1636 	INIT_LIST_HEAD(&sdata->key_list);
1637 
1638 	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1639 			  ieee80211_dfs_cac_timer_work);
1640 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1641 			  ieee80211_delayed_tailroom_dec);
1642 
1643 	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1644 		struct ieee80211_supported_band *sband;
1645 		sband = local->hw.wiphy->bands[i];
1646 		sdata->rc_rateidx_mask[i] =
1647 			sband ? (1 << sband->n_bitrates) - 1 : 0;
1648 		if (sband)
1649 			memcpy(sdata->rc_rateidx_mcs_mask[i],
1650 			       sband->ht_cap.mcs.rx_mask,
1651 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1652 		else
1653 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
1654 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1655 	}
1656 
1657 	ieee80211_set_default_queues(sdata);
1658 
1659 	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1660 	sdata->user_power_level = local->user_power_level;
1661 
1662 	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1663 
1664 	/* setup type-dependent data */
1665 	ieee80211_setup_sdata(sdata, type);
1666 
1667 	if (ndev) {
1668 		if (params) {
1669 			ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1670 			if (type == NL80211_IFTYPE_STATION)
1671 				sdata->u.mgd.use_4addr = params->use_4addr;
1672 		}
1673 
1674 		ndev->features |= local->hw.netdev_features;
1675 
1676 		ret = register_netdevice(ndev);
1677 		if (ret) {
1678 			free_netdev(ndev);
1679 			return ret;
1680 		}
1681 	}
1682 
1683 	mutex_lock(&local->iflist_mtx);
1684 	list_add_tail_rcu(&sdata->list, &local->interfaces);
1685 	mutex_unlock(&local->iflist_mtx);
1686 
1687 	if (new_wdev)
1688 		*new_wdev = &sdata->wdev;
1689 
1690 	return 0;
1691 }
1692 
1693 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1694 {
1695 	ASSERT_RTNL();
1696 
1697 	mutex_lock(&sdata->local->iflist_mtx);
1698 	list_del_rcu(&sdata->list);
1699 	mutex_unlock(&sdata->local->iflist_mtx);
1700 
1701 	synchronize_rcu();
1702 
1703 	if (sdata->dev) {
1704 		unregister_netdevice(sdata->dev);
1705 	} else {
1706 		cfg80211_unregister_wdev(&sdata->wdev);
1707 		kfree(sdata);
1708 	}
1709 }
1710 
1711 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1712 {
1713 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1714 		return;
1715 	ieee80211_do_stop(sdata, true);
1716 	ieee80211_teardown_sdata(sdata);
1717 }
1718 
1719 /*
1720  * Remove all interfaces, may only be called at hardware unregistration
1721  * time because it doesn't do RCU-safe list removals.
1722  */
1723 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1724 {
1725 	struct ieee80211_sub_if_data *sdata, *tmp;
1726 	LIST_HEAD(unreg_list);
1727 	LIST_HEAD(wdev_list);
1728 
1729 	ASSERT_RTNL();
1730 
1731 	/*
1732 	 * Close all AP_VLAN interfaces first, as otherwise they
1733 	 * might be closed while the AP interface they belong to
1734 	 * is closed, causing unregister_netdevice_many() to crash.
1735 	 */
1736 	list_for_each_entry(sdata, &local->interfaces, list)
1737 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1738 			dev_close(sdata->dev);
1739 
1740 	mutex_lock(&local->iflist_mtx);
1741 	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1742 		list_del(&sdata->list);
1743 
1744 		if (sdata->dev)
1745 			unregister_netdevice_queue(sdata->dev, &unreg_list);
1746 		else
1747 			list_add(&sdata->list, &wdev_list);
1748 	}
1749 	mutex_unlock(&local->iflist_mtx);
1750 	unregister_netdevice_many(&unreg_list);
1751 	list_del(&unreg_list);
1752 
1753 	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1754 		list_del(&sdata->list);
1755 		cfg80211_unregister_wdev(&sdata->wdev);
1756 		kfree(sdata);
1757 	}
1758 }
1759 
1760 static int netdev_notify(struct notifier_block *nb,
1761 			 unsigned long state, void *ptr)
1762 {
1763 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1764 	struct ieee80211_sub_if_data *sdata;
1765 
1766 	if (state != NETDEV_CHANGENAME)
1767 		return 0;
1768 
1769 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1770 		return 0;
1771 
1772 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1773 		return 0;
1774 
1775 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1776 
1777 	memcpy(sdata->name, dev->name, IFNAMSIZ);
1778 
1779 	ieee80211_debugfs_rename_netdev(sdata);
1780 	return 0;
1781 }
1782 
1783 static struct notifier_block mac80211_netdev_notifier = {
1784 	.notifier_call = netdev_notify,
1785 };
1786 
1787 int ieee80211_iface_init(void)
1788 {
1789 	return register_netdevice_notifier(&mac80211_netdev_notifier);
1790 }
1791 
1792 void ieee80211_iface_exit(void)
1793 {
1794 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
1795 }
1796