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) 2018-2023 Intel Corporation
12  */
13 #include <linux/slab.h>
14 #include <linux/kernel.h>
15 #include <linux/if_arp.h>
16 #include <linux/netdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/kcov.h>
19 #include <net/mac80211.h>
20 #include <net/ieee80211_radiotap.h>
21 #include "ieee80211_i.h"
22 #include "sta_info.h"
23 #include "debugfs_netdev.h"
24 #include "mesh.h"
25 #include "led.h"
26 #include "driver-ops.h"
27 #include "wme.h"
28 #include "rate.h"
29 
30 /**
31  * DOC: Interface list locking
32  *
33  * The interface list in each struct ieee80211_local is protected
34  * three-fold:
35  *
36  * (1) modifications may only be done under the RTNL
37  * (2) modifications and readers are protected against each other by
38  *     the iflist_mtx.
39  * (3) modifications are done in an RCU manner so atomic readers
40  *     can traverse the list in RCU-safe blocks.
41  *
42  * As a consequence, reads (traversals) of the list can be protected
43  * by either the RTNL, the iflist_mtx or RCU.
44  */
45 
46 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
47 
__ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata)48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
49 {
50 	struct ieee80211_chanctx_conf *chanctx_conf;
51 	int power;
52 
53 	rcu_read_lock();
54 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
55 	if (!chanctx_conf) {
56 		rcu_read_unlock();
57 		return false;
58 	}
59 
60 	power = ieee80211_chandef_max_power(&chanctx_conf->def);
61 	rcu_read_unlock();
62 
63 	if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
64 		power = min(power, sdata->deflink.user_power_level);
65 
66 	if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
67 		power = min(power, sdata->deflink.ap_power_level);
68 
69 	if (power != sdata->vif.bss_conf.txpower) {
70 		sdata->vif.bss_conf.txpower = power;
71 		ieee80211_hw_config(sdata->local, 0);
72 		return true;
73 	}
74 
75 	return false;
76 }
77 
ieee80211_recalc_txpower(struct ieee80211_sub_if_data * sdata,bool update_bss)78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
79 			      bool update_bss)
80 {
81 	if (__ieee80211_recalc_txpower(sdata) ||
82 	    (update_bss && ieee80211_sdata_running(sdata)))
83 		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
84 						  BSS_CHANGED_TXPOWER);
85 }
86 
__ieee80211_idle_off(struct ieee80211_local * local)87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
88 {
89 	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
90 		return 0;
91 
92 	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
93 	return IEEE80211_CONF_CHANGE_IDLE;
94 }
95 
__ieee80211_idle_on(struct ieee80211_local * local)96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
97 {
98 	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
99 		return 0;
100 
101 	ieee80211_flush_queues(local, NULL, false);
102 
103 	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
104 	return IEEE80211_CONF_CHANGE_IDLE;
105 }
106 
__ieee80211_recalc_idle(struct ieee80211_local * local,bool force_active)107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
108 				   bool force_active)
109 {
110 	bool working, scanning, active;
111 	unsigned int led_trig_start = 0, led_trig_stop = 0;
112 
113 	lockdep_assert_held(&local->mtx);
114 
115 	active = force_active ||
116 		 !list_empty(&local->chanctx_list) ||
117 		 local->monitors;
118 
119 	working = !local->ops->remain_on_channel &&
120 		  !list_empty(&local->roc_list);
121 
122 	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
123 		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
124 
125 	if (working || scanning)
126 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
127 	else
128 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
129 
130 	if (active)
131 		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
132 	else
133 		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
134 
135 	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
136 
137 	if (working || scanning || active)
138 		return __ieee80211_idle_off(local);
139 	return __ieee80211_idle_on(local);
140 }
141 
ieee80211_idle_off(struct ieee80211_local * local)142 u32 ieee80211_idle_off(struct ieee80211_local *local)
143 {
144 	return __ieee80211_recalc_idle(local, true);
145 }
146 
ieee80211_recalc_idle(struct ieee80211_local * local)147 void ieee80211_recalc_idle(struct ieee80211_local *local)
148 {
149 	u32 change = __ieee80211_recalc_idle(local, false);
150 	if (change)
151 		ieee80211_hw_config(local, change);
152 }
153 
ieee80211_verify_mac(struct ieee80211_sub_if_data * sdata,u8 * addr,bool check_dup)154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
155 				bool check_dup)
156 {
157 	struct ieee80211_local *local = sdata->local;
158 	struct ieee80211_sub_if_data *iter;
159 	u64 new, mask, tmp;
160 	u8 *m;
161 	int ret = 0;
162 
163 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
164 		return 0;
165 
166 	m = addr;
167 	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
168 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
169 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
170 
171 	m = local->hw.wiphy->addr_mask;
172 	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
173 		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
174 		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
175 
176 	if (!check_dup)
177 		return ret;
178 
179 	mutex_lock(&local->iflist_mtx);
180 	list_for_each_entry(iter, &local->interfaces, list) {
181 		if (iter == sdata)
182 			continue;
183 
184 		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
185 		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
186 			continue;
187 
188 		m = iter->vif.addr;
189 		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
190 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
191 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
192 
193 		if ((new & ~mask) != (tmp & ~mask)) {
194 			ret = -EINVAL;
195 			break;
196 		}
197 	}
198 	mutex_unlock(&local->iflist_mtx);
199 
200 	return ret;
201 }
202 
ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data * sdata)203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
204 {
205 	struct ieee80211_roc_work *roc;
206 	struct ieee80211_local *local = sdata->local;
207 	struct ieee80211_sub_if_data *scan_sdata;
208 	int ret = 0;
209 
210 	/* To be the most flexible here we want to only limit changing the
211 	 * address if the specific interface is doing offchannel work or
212 	 * scanning.
213 	 */
214 	if (netif_carrier_ok(sdata->dev))
215 		return -EBUSY;
216 
217 	mutex_lock(&local->mtx);
218 
219 	/* First check no ROC work is happening on this iface */
220 	list_for_each_entry(roc, &local->roc_list, list) {
221 		if (roc->sdata != sdata)
222 			continue;
223 
224 		if (roc->started) {
225 			ret = -EBUSY;
226 			goto unlock;
227 		}
228 	}
229 
230 	/* And if this iface is scanning */
231 	if (local->scanning) {
232 		scan_sdata = rcu_dereference_protected(local->scan_sdata,
233 						       lockdep_is_held(&local->mtx));
234 		if (sdata == scan_sdata)
235 			ret = -EBUSY;
236 	}
237 
238 	switch (sdata->vif.type) {
239 	case NL80211_IFTYPE_STATION:
240 	case NL80211_IFTYPE_P2P_CLIENT:
241 		/* More interface types could be added here but changing the
242 		 * address while powered makes the most sense in client modes.
243 		 */
244 		break;
245 	default:
246 		ret = -EOPNOTSUPP;
247 	}
248 
249 unlock:
250 	mutex_unlock(&local->mtx);
251 	return ret;
252 }
253 
ieee80211_change_mac(struct net_device * dev,void * addr)254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
255 {
256 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
257 	struct ieee80211_local *local = sdata->local;
258 	struct sockaddr *sa = addr;
259 	bool check_dup = true;
260 	bool live = false;
261 	int ret;
262 
263 	if (ieee80211_sdata_running(sdata)) {
264 		ret = ieee80211_can_powered_addr_change(sdata);
265 		if (ret)
266 			return ret;
267 
268 		live = true;
269 	}
270 
271 	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
272 	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
273 		check_dup = false;
274 
275 	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
276 	if (ret)
277 		return ret;
278 
279 	if (live)
280 		drv_remove_interface(local, sdata);
281 	ret = eth_mac_addr(dev, sa);
282 
283 	if (ret == 0) {
284 		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
285 		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
286 	}
287 
288 	/* Regardless of eth_mac_addr() return we still want to add the
289 	 * interface back. This should not fail...
290 	 */
291 	if (live)
292 		WARN_ON(drv_add_interface(local, sdata));
293 
294 	return ret;
295 }
296 
identical_mac_addr_allowed(int type1,int type2)297 static inline int identical_mac_addr_allowed(int type1, int type2)
298 {
299 	return type1 == NL80211_IFTYPE_MONITOR ||
300 		type2 == NL80211_IFTYPE_MONITOR ||
301 		type1 == NL80211_IFTYPE_P2P_DEVICE ||
302 		type2 == NL80211_IFTYPE_P2P_DEVICE ||
303 		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
304 		(type1 == NL80211_IFTYPE_AP_VLAN &&
305 			(type2 == NL80211_IFTYPE_AP ||
306 			 type2 == NL80211_IFTYPE_AP_VLAN));
307 }
308 
ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
310 					    enum nl80211_iftype iftype)
311 {
312 	struct ieee80211_local *local = sdata->local;
313 	struct ieee80211_sub_if_data *nsdata;
314 	int ret;
315 
316 	ASSERT_RTNL();
317 
318 	/* we hold the RTNL here so can safely walk the list */
319 	list_for_each_entry(nsdata, &local->interfaces, list) {
320 		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
321 			/*
322 			 * Only OCB and monitor mode may coexist
323 			 */
324 			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
325 			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
326 			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
327 			     nsdata->vif.type == NL80211_IFTYPE_OCB))
328 				return -EBUSY;
329 
330 			/*
331 			 * Allow only a single IBSS interface to be up at any
332 			 * time. This is restricted because beacon distribution
333 			 * cannot work properly if both are in the same IBSS.
334 			 *
335 			 * To remove this restriction we'd have to disallow them
336 			 * from setting the same SSID on different IBSS interfaces
337 			 * belonging to the same hardware. Then, however, we're
338 			 * faced with having to adopt two different TSF timers...
339 			 */
340 			if (iftype == NL80211_IFTYPE_ADHOC &&
341 			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
342 				return -EBUSY;
343 			/*
344 			 * will not add another interface while any channel
345 			 * switch is active.
346 			 */
347 			if (nsdata->vif.bss_conf.csa_active)
348 				return -EBUSY;
349 
350 			/*
351 			 * The remaining checks are only performed for interfaces
352 			 * with the same MAC address.
353 			 */
354 			if (!ether_addr_equal(sdata->vif.addr,
355 					      nsdata->vif.addr))
356 				continue;
357 
358 			/*
359 			 * check whether it may have the same address
360 			 */
361 			if (!identical_mac_addr_allowed(iftype,
362 							nsdata->vif.type))
363 				return -ENOTUNIQ;
364 
365 			/* No support for VLAN with MLO yet */
366 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
367 			    sdata->wdev.use_4addr &&
368 			    nsdata->vif.type == NL80211_IFTYPE_AP &&
369 			    nsdata->vif.valid_links)
370 				return -EOPNOTSUPP;
371 
372 			/*
373 			 * can only add VLANs to enabled APs
374 			 */
375 			if (iftype == NL80211_IFTYPE_AP_VLAN &&
376 			    nsdata->vif.type == NL80211_IFTYPE_AP)
377 				sdata->bss = &nsdata->u.ap;
378 		}
379 	}
380 
381 	mutex_lock(&local->chanctx_mtx);
382 	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
383 	mutex_unlock(&local->chanctx_mtx);
384 	return ret;
385 }
386 
ieee80211_check_queues(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype iftype)387 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
388 				  enum nl80211_iftype iftype)
389 {
390 	int n_queues = sdata->local->hw.queues;
391 	int i;
392 
393 	if (iftype == NL80211_IFTYPE_NAN)
394 		return 0;
395 
396 	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
397 		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
398 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
399 					 IEEE80211_INVAL_HW_QUEUE))
400 				return -EINVAL;
401 			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
402 					 n_queues))
403 				return -EINVAL;
404 		}
405 	}
406 
407 	if ((iftype != NL80211_IFTYPE_AP &&
408 	     iftype != NL80211_IFTYPE_P2P_GO &&
409 	     iftype != NL80211_IFTYPE_MESH_POINT) ||
410 	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
411 		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
412 		return 0;
413 	}
414 
415 	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
416 		return -EINVAL;
417 
418 	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
419 		return -EINVAL;
420 
421 	return 0;
422 }
423 
ieee80211_open(struct net_device * dev)424 static int ieee80211_open(struct net_device *dev)
425 {
426 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
427 	int err;
428 
429 	/* fail early if user set an invalid address */
430 	if (!is_valid_ether_addr(dev->dev_addr))
431 		return -EADDRNOTAVAIL;
432 
433 	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
434 	if (err)
435 		return err;
436 
437 	wiphy_lock(sdata->local->hw.wiphy);
438 	err = ieee80211_do_open(&sdata->wdev, true);
439 	wiphy_unlock(sdata->local->hw.wiphy);
440 
441 	return err;
442 }
443 
ieee80211_do_stop(struct ieee80211_sub_if_data * sdata,bool going_down)444 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
445 {
446 	struct ieee80211_local *local = sdata->local;
447 	unsigned long flags;
448 	struct sk_buff *skb, *tmp;
449 	u32 hw_reconf_flags = 0;
450 	int i, flushed;
451 	struct ps_data *ps;
452 	struct cfg80211_chan_def chandef;
453 	bool cancel_scan;
454 	struct cfg80211_nan_func *func;
455 
456 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
457 	synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
458 
459 	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
460 	if (cancel_scan)
461 		ieee80211_scan_cancel(local);
462 
463 	ieee80211_roc_purge(local, sdata);
464 
465 	switch (sdata->vif.type) {
466 	case NL80211_IFTYPE_STATION:
467 		ieee80211_mgd_stop(sdata);
468 		break;
469 	case NL80211_IFTYPE_ADHOC:
470 		ieee80211_ibss_stop(sdata);
471 		break;
472 	case NL80211_IFTYPE_MONITOR:
473 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
474 			break;
475 		list_del_rcu(&sdata->u.mntr.list);
476 		break;
477 	default:
478 		break;
479 	}
480 
481 	/*
482 	 * Remove all stations associated with this interface.
483 	 *
484 	 * This must be done before calling ops->remove_interface()
485 	 * because otherwise we can later invoke ops->sta_notify()
486 	 * whenever the STAs are removed, and that invalidates driver
487 	 * assumptions about always getting a vif pointer that is valid
488 	 * (because if we remove a STA after ops->remove_interface()
489 	 * the driver will have removed the vif info already!)
490 	 *
491 	 * For AP_VLANs stations may exist since there's nothing else that
492 	 * would have removed them, but in other modes there shouldn't
493 	 * be any stations.
494 	 */
495 	flushed = sta_info_flush(sdata);
496 	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
497 
498 	/* don't count this interface for allmulti while it is down */
499 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
500 		atomic_dec(&local->iff_allmultis);
501 
502 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
503 		local->fif_pspoll--;
504 		local->fif_probe_req--;
505 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
506 		local->fif_probe_req--;
507 	}
508 
509 	if (sdata->dev) {
510 		netif_addr_lock_bh(sdata->dev);
511 		spin_lock_bh(&local->filter_lock);
512 		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
513 				 sdata->dev->addr_len);
514 		spin_unlock_bh(&local->filter_lock);
515 		netif_addr_unlock_bh(sdata->dev);
516 	}
517 
518 	del_timer_sync(&local->dynamic_ps_timer);
519 	cancel_work_sync(&local->dynamic_ps_enable_work);
520 
521 	cancel_work_sync(&sdata->recalc_smps);
522 
523 	sdata_lock(sdata);
524 	WARN(ieee80211_vif_is_mld(&sdata->vif),
525 	     "destroying interface with valid links 0x%04x\n",
526 	     sdata->vif.valid_links);
527 
528 	mutex_lock(&local->mtx);
529 	sdata->vif.bss_conf.csa_active = false;
530 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
531 		sdata->deflink.u.mgd.csa_waiting_bcn = false;
532 	if (sdata->deflink.csa_block_tx) {
533 		ieee80211_wake_vif_queues(local, sdata,
534 					  IEEE80211_QUEUE_STOP_REASON_CSA);
535 		sdata->deflink.csa_block_tx = false;
536 	}
537 	mutex_unlock(&local->mtx);
538 	sdata_unlock(sdata);
539 
540 	cancel_work_sync(&sdata->deflink.csa_finalize_work);
541 	cancel_work_sync(&sdata->deflink.color_change_finalize_work);
542 
543 	cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
544 
545 	if (sdata->wdev.cac_started) {
546 		chandef = sdata->vif.bss_conf.chandef;
547 		WARN_ON(local->suspended);
548 		mutex_lock(&local->mtx);
549 		ieee80211_link_release_channel(&sdata->deflink);
550 		mutex_unlock(&local->mtx);
551 		cfg80211_cac_event(sdata->dev, &chandef,
552 				   NL80211_RADAR_CAC_ABORTED,
553 				   GFP_KERNEL);
554 	}
555 
556 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
557 		WARN_ON(!list_empty(&sdata->u.ap.vlans));
558 	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
559 		/* remove all packets in parent bc_buf pointing to this dev */
560 		ps = &sdata->bss->ps;
561 
562 		spin_lock_irqsave(&ps->bc_buf.lock, flags);
563 		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
564 			if (skb->dev == sdata->dev) {
565 				__skb_unlink(skb, &ps->bc_buf);
566 				local->total_ps_buffered--;
567 				ieee80211_free_txskb(&local->hw, skb);
568 			}
569 		}
570 		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
571 	}
572 
573 	if (going_down)
574 		local->open_count--;
575 
576 	switch (sdata->vif.type) {
577 	case NL80211_IFTYPE_AP_VLAN:
578 		mutex_lock(&local->mtx);
579 		list_del(&sdata->u.vlan.list);
580 		mutex_unlock(&local->mtx);
581 		RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
582 		/* see comment in the default case below */
583 		ieee80211_free_keys(sdata, true);
584 		/* no need to tell driver */
585 		break;
586 	case NL80211_IFTYPE_MONITOR:
587 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
588 			local->cooked_mntrs--;
589 			break;
590 		}
591 
592 		local->monitors--;
593 		if (local->monitors == 0) {
594 			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
595 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
596 		}
597 
598 		ieee80211_adjust_monitor_flags(sdata, -1);
599 		break;
600 	case NL80211_IFTYPE_NAN:
601 		/* clean all the functions */
602 		spin_lock_bh(&sdata->u.nan.func_lock);
603 
604 		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
605 			idr_remove(&sdata->u.nan.function_inst_ids, i);
606 			cfg80211_free_nan_func(func);
607 		}
608 		idr_destroy(&sdata->u.nan.function_inst_ids);
609 
610 		spin_unlock_bh(&sdata->u.nan.func_lock);
611 		break;
612 	case NL80211_IFTYPE_P2P_DEVICE:
613 		/* relies on synchronize_rcu() below */
614 		RCU_INIT_POINTER(local->p2p_sdata, NULL);
615 		fallthrough;
616 	default:
617 		wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
618 		/*
619 		 * When we get here, the interface is marked down.
620 		 * Free the remaining keys, if there are any
621 		 * (which can happen in AP mode if userspace sets
622 		 * keys before the interface is operating)
623 		 *
624 		 * Force the key freeing to always synchronize_net()
625 		 * to wait for the RX path in case it is using this
626 		 * interface enqueuing frames at this very time on
627 		 * another CPU.
628 		 */
629 		ieee80211_free_keys(sdata, true);
630 		skb_queue_purge(&sdata->skb_queue);
631 		skb_queue_purge(&sdata->status_queue);
632 	}
633 
634 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
635 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
636 		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
637 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
638 			if (info->control.vif == &sdata->vif) {
639 				__skb_unlink(skb, &local->pending[i]);
640 				ieee80211_free_txskb(&local->hw, skb);
641 			}
642 		}
643 	}
644 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
645 
646 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
647 		ieee80211_txq_remove_vlan(local, sdata);
648 
649 	sdata->bss = NULL;
650 
651 	if (local->open_count == 0)
652 		ieee80211_clear_tx_pending(local);
653 
654 	sdata->vif.bss_conf.beacon_int = 0;
655 
656 	/*
657 	 * If the interface goes down while suspended, presumably because
658 	 * the device was unplugged and that happens before our resume,
659 	 * then the driver is already unconfigured and the remainder of
660 	 * this function isn't needed.
661 	 * XXX: what about WoWLAN? If the device has software state, e.g.
662 	 *	memory allocated, it might expect teardown commands from
663 	 *	mac80211 here?
664 	 */
665 	if (local->suspended) {
666 		WARN_ON(local->wowlan);
667 		WARN_ON(rcu_access_pointer(local->monitor_sdata));
668 		return;
669 	}
670 
671 	switch (sdata->vif.type) {
672 	case NL80211_IFTYPE_AP_VLAN:
673 		break;
674 	case NL80211_IFTYPE_MONITOR:
675 		if (local->monitors == 0)
676 			ieee80211_del_virtual_monitor(local);
677 
678 		mutex_lock(&local->mtx);
679 		ieee80211_recalc_idle(local);
680 		mutex_unlock(&local->mtx);
681 
682 		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
683 			break;
684 
685 		fallthrough;
686 	default:
687 		if (going_down)
688 			drv_remove_interface(local, sdata);
689 	}
690 
691 	ieee80211_recalc_ps(local);
692 
693 	if (cancel_scan)
694 		wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
695 
696 	if (local->open_count == 0) {
697 		ieee80211_stop_device(local);
698 
699 		/* no reconfiguring after stop! */
700 		return;
701 	}
702 
703 	/* do after stop to avoid reconfiguring when we stop anyway */
704 	ieee80211_configure_filter(local);
705 	ieee80211_hw_config(local, hw_reconf_flags);
706 
707 	if (local->monitors == local->open_count)
708 		ieee80211_add_virtual_monitor(local);
709 }
710 
ieee80211_stop_mbssid(struct ieee80211_sub_if_data * sdata)711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
712 {
713 	struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
714 	struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
715 
716 	if (!tx_vif)
717 		return;
718 
719 	tx_sdata = vif_to_sdata(tx_vif);
720 	sdata->vif.mbssid_tx_vif = NULL;
721 
722 	list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
723 				 &tx_sdata->local->interfaces, list) {
724 		if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
725 		    non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
726 		    ieee80211_sdata_running(non_tx_sdata)) {
727 			non_tx_sdata->vif.mbssid_tx_vif = NULL;
728 			dev_close(non_tx_sdata->wdev.netdev);
729 		}
730 	}
731 
732 	if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
733 		tx_sdata->vif.mbssid_tx_vif = NULL;
734 		dev_close(tx_sdata->wdev.netdev);
735 	}
736 }
737 
ieee80211_stop(struct net_device * dev)738 static int ieee80211_stop(struct net_device *dev)
739 {
740 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
741 
742 	/* close dependent VLAN and MBSSID interfaces before locking wiphy */
743 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
744 		struct ieee80211_sub_if_data *vlan, *tmpsdata;
745 
746 		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
747 					 u.vlan.list)
748 			dev_close(vlan->dev);
749 
750 		ieee80211_stop_mbssid(sdata);
751 	}
752 
753 	cancel_work_sync(&sdata->activate_links_work);
754 
755 	wiphy_lock(sdata->local->hw.wiphy);
756 	ieee80211_do_stop(sdata, true);
757 	wiphy_unlock(sdata->local->hw.wiphy);
758 
759 	return 0;
760 }
761 
ieee80211_set_multicast_list(struct net_device * dev)762 static void ieee80211_set_multicast_list(struct net_device *dev)
763 {
764 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
765 	struct ieee80211_local *local = sdata->local;
766 	int allmulti, sdata_allmulti;
767 
768 	allmulti = !!(dev->flags & IFF_ALLMULTI);
769 	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
770 
771 	if (allmulti != sdata_allmulti) {
772 		if (dev->flags & IFF_ALLMULTI)
773 			atomic_inc(&local->iff_allmultis);
774 		else
775 			atomic_dec(&local->iff_allmultis);
776 		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
777 	}
778 
779 	spin_lock_bh(&local->filter_lock);
780 	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
781 	spin_unlock_bh(&local->filter_lock);
782 	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
783 }
784 
785 /*
786  * Called when the netdev is removed or, by the code below, before
787  * the interface type changes.
788  */
ieee80211_teardown_sdata(struct ieee80211_sub_if_data * sdata)789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
790 {
791 	/* free extra data */
792 	ieee80211_free_keys(sdata, false);
793 
794 	ieee80211_debugfs_remove_netdev(sdata);
795 
796 	ieee80211_destroy_frag_cache(&sdata->frags);
797 
798 	if (ieee80211_vif_is_mesh(&sdata->vif))
799 		ieee80211_mesh_teardown_sdata(sdata);
800 
801 	ieee80211_vif_clear_links(sdata);
802 	ieee80211_link_stop(&sdata->deflink);
803 }
804 
ieee80211_uninit(struct net_device * dev)805 static void ieee80211_uninit(struct net_device *dev)
806 {
807 	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
808 }
809 
810 static void
ieee80211_get_stats64(struct net_device * dev,struct rtnl_link_stats64 * stats)811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
812 {
813 	dev_fetch_sw_netstats(stats, dev->tstats);
814 }
815 
ieee80211_netdev_setup_tc(struct net_device * dev,enum tc_setup_type type,void * type_data)816 static int ieee80211_netdev_setup_tc(struct net_device *dev,
817 				     enum tc_setup_type type, void *type_data)
818 {
819 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
820 	struct ieee80211_local *local = sdata->local;
821 
822 	return drv_net_setup_tc(local, sdata, dev, type, type_data);
823 }
824 
825 static const struct net_device_ops ieee80211_dataif_ops = {
826 	.ndo_open		= ieee80211_open,
827 	.ndo_stop		= ieee80211_stop,
828 	.ndo_uninit		= ieee80211_uninit,
829 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
830 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
831 	.ndo_set_mac_address 	= ieee80211_change_mac,
832 	.ndo_get_stats64	= ieee80211_get_stats64,
833 	.ndo_setup_tc		= ieee80211_netdev_setup_tc,
834 };
835 
ieee80211_monitor_select_queue(struct net_device * dev,struct sk_buff * skb,struct net_device * sb_dev)836 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
837 					  struct sk_buff *skb,
838 					  struct net_device *sb_dev)
839 {
840 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
841 	struct ieee80211_local *local = sdata->local;
842 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
843 	struct ieee80211_hdr *hdr;
844 	int len_rthdr;
845 
846 	if (local->hw.queues < IEEE80211_NUM_ACS)
847 		return 0;
848 
849 	/* reset flags and info before parsing radiotap header */
850 	memset(info, 0, sizeof(*info));
851 
852 	if (!ieee80211_parse_tx_radiotap(skb, dev))
853 		return 0; /* doesn't matter, frame will be dropped */
854 
855 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
856 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
857 	if (skb->len < len_rthdr + 2 ||
858 	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
859 		return 0; /* doesn't matter, frame will be dropped */
860 
861 	return ieee80211_select_queue_80211(sdata, skb, hdr);
862 }
863 
864 static const struct net_device_ops ieee80211_monitorif_ops = {
865 	.ndo_open		= ieee80211_open,
866 	.ndo_stop		= ieee80211_stop,
867 	.ndo_uninit		= ieee80211_uninit,
868 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
869 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
870 	.ndo_set_mac_address 	= ieee80211_change_mac,
871 	.ndo_select_queue	= ieee80211_monitor_select_queue,
872 	.ndo_get_stats64	= ieee80211_get_stats64,
873 };
874 
ieee80211_netdev_fill_forward_path(struct net_device_path_ctx * ctx,struct net_device_path * path)875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
876 					      struct net_device_path *path)
877 {
878 	struct ieee80211_sub_if_data *sdata;
879 	struct ieee80211_local *local;
880 	struct sta_info *sta;
881 	int ret = -ENOENT;
882 
883 	sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
884 	local = sdata->local;
885 
886 	if (!local->ops->net_fill_forward_path)
887 		return -EOPNOTSUPP;
888 
889 	rcu_read_lock();
890 	switch (sdata->vif.type) {
891 	case NL80211_IFTYPE_AP_VLAN:
892 		sta = rcu_dereference(sdata->u.vlan.sta);
893 		if (sta)
894 			break;
895 		if (sdata->wdev.use_4addr)
896 			goto out;
897 		if (is_multicast_ether_addr(ctx->daddr))
898 			goto out;
899 		sta = sta_info_get_bss(sdata, ctx->daddr);
900 		break;
901 	case NL80211_IFTYPE_AP:
902 		if (is_multicast_ether_addr(ctx->daddr))
903 			goto out;
904 		sta = sta_info_get(sdata, ctx->daddr);
905 		break;
906 	case NL80211_IFTYPE_STATION:
907 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
908 			sta = sta_info_get(sdata, ctx->daddr);
909 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
910 				if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
911 					goto out;
912 
913 				break;
914 			}
915 		}
916 
917 		sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
918 		break;
919 	default:
920 		goto out;
921 	}
922 
923 	if (!sta)
924 		goto out;
925 
926 	ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
927 out:
928 	rcu_read_unlock();
929 
930 	return ret;
931 }
932 
933 static const struct net_device_ops ieee80211_dataif_8023_ops = {
934 	.ndo_open		= ieee80211_open,
935 	.ndo_stop		= ieee80211_stop,
936 	.ndo_uninit		= ieee80211_uninit,
937 	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
938 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
939 	.ndo_set_mac_address	= ieee80211_change_mac,
940 	.ndo_get_stats64	= ieee80211_get_stats64,
941 	.ndo_fill_forward_path	= ieee80211_netdev_fill_forward_path,
942 	.ndo_setup_tc		= ieee80211_netdev_setup_tc,
943 };
944 
ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
946 {
947 	switch (iftype) {
948 	/* P2P GO and client are mapped to AP/STATION types */
949 	case NL80211_IFTYPE_AP:
950 	case NL80211_IFTYPE_STATION:
951 		return true;
952 	default:
953 		return false;
954 	}
955 }
956 
ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data * sdata)957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
958 {
959 	struct ieee80211_local *local = sdata->local;
960 	u32 flags;
961 
962 	flags = sdata->vif.offload_flags;
963 
964 	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
965 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
966 		flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
967 
968 		if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
969 		    local->hw.wiphy->frag_threshold != (u32)-1)
970 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
971 
972 		if (local->monitors)
973 			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
974 	} else {
975 		flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
976 	}
977 
978 	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
979 	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
980 		flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
981 
982 		if (local->monitors &&
983 		    !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
984 			flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
985 	} else {
986 		flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
987 	}
988 
989 	if (sdata->vif.offload_flags == flags)
990 		return false;
991 
992 	sdata->vif.offload_flags = flags;
993 	ieee80211_check_fast_rx_iface(sdata);
994 	return true;
995 }
996 
ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data * sdata)997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
998 {
999 	struct ieee80211_local *local = sdata->local;
1000 	struct ieee80211_sub_if_data *bss = sdata;
1001 	bool enabled;
1002 
1003 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1004 		if (!sdata->bss)
1005 			return;
1006 
1007 		bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1008 	}
1009 
1010 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1011 	    !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1012 		return;
1013 
1014 	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1015 	if (sdata->wdev.use_4addr &&
1016 	    !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1017 		enabled = false;
1018 
1019 	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1020 					   &ieee80211_dataif_ops;
1021 }
1022 
ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data * sdata)1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1024 {
1025 	struct ieee80211_local *local = sdata->local;
1026 	struct ieee80211_sub_if_data *vsdata;
1027 
1028 	if (ieee80211_set_sdata_offload_flags(sdata)) {
1029 		drv_update_vif_offload(local, sdata);
1030 		ieee80211_set_vif_encap_ops(sdata);
1031 	}
1032 
1033 	list_for_each_entry(vsdata, &local->interfaces, list) {
1034 		if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1035 		    vsdata->bss != &sdata->u.ap)
1036 			continue;
1037 
1038 		ieee80211_set_vif_encap_ops(vsdata);
1039 	}
1040 }
1041 
ieee80211_recalc_offload(struct ieee80211_local * local)1042 void ieee80211_recalc_offload(struct ieee80211_local *local)
1043 {
1044 	struct ieee80211_sub_if_data *sdata;
1045 
1046 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1047 		return;
1048 
1049 	mutex_lock(&local->iflist_mtx);
1050 
1051 	list_for_each_entry(sdata, &local->interfaces, list) {
1052 		if (!ieee80211_sdata_running(sdata))
1053 			continue;
1054 
1055 		ieee80211_recalc_sdata_offload(sdata);
1056 	}
1057 
1058 	mutex_unlock(&local->iflist_mtx);
1059 }
1060 
ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data * sdata,const int offset)1061 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1062 				    const int offset)
1063 {
1064 	struct ieee80211_local *local = sdata->local;
1065 	u32 flags = sdata->u.mntr.flags;
1066 
1067 #define ADJUST(_f, _s)	do {					\
1068 	if (flags & MONITOR_FLAG_##_f)				\
1069 		local->fif_##_s += offset;			\
1070 	} while (0)
1071 
1072 	ADJUST(FCSFAIL, fcsfail);
1073 	ADJUST(PLCPFAIL, plcpfail);
1074 	ADJUST(CONTROL, control);
1075 	ADJUST(CONTROL, pspoll);
1076 	ADJUST(OTHER_BSS, other_bss);
1077 
1078 #undef ADJUST
1079 }
1080 
ieee80211_set_default_queues(struct ieee80211_sub_if_data * sdata)1081 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1082 {
1083 	struct ieee80211_local *local = sdata->local;
1084 	int i;
1085 
1086 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1087 		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1088 			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1089 		else if (local->hw.queues >= IEEE80211_NUM_ACS)
1090 			sdata->vif.hw_queue[i] = i;
1091 		else
1092 			sdata->vif.hw_queue[i] = 0;
1093 	}
1094 	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1095 }
1096 
ieee80211_sdata_init(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1097 static void ieee80211_sdata_init(struct ieee80211_local *local,
1098 				 struct ieee80211_sub_if_data *sdata)
1099 {
1100 	sdata->local = local;
1101 
1102 	/*
1103 	 * Initialize the default link, so we can use link_id 0 for non-MLD,
1104 	 * and that continues to work for non-MLD-aware drivers that use just
1105 	 * vif.bss_conf instead of vif.link_conf.
1106 	 *
1107 	 * Note that we never change this, so if link ID 0 isn't used in an
1108 	 * MLD connection, we get a separate allocation for it.
1109 	 */
1110 	ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1111 }
1112 
ieee80211_add_virtual_monitor(struct ieee80211_local * local)1113 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1114 {
1115 	struct ieee80211_sub_if_data *sdata;
1116 	int ret;
1117 
1118 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1119 		return 0;
1120 
1121 	ASSERT_RTNL();
1122 	lockdep_assert_wiphy(local->hw.wiphy);
1123 
1124 	if (local->monitor_sdata)
1125 		return 0;
1126 
1127 	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1128 	if (!sdata)
1129 		return -ENOMEM;
1130 
1131 	/* set up data */
1132 	sdata->vif.type = NL80211_IFTYPE_MONITOR;
1133 	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1134 		 wiphy_name(local->hw.wiphy));
1135 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1136 	mutex_init(&sdata->wdev.mtx);
1137 
1138 	ieee80211_sdata_init(local, sdata);
1139 
1140 	ieee80211_set_default_queues(sdata);
1141 
1142 	ret = drv_add_interface(local, sdata);
1143 	if (WARN_ON(ret)) {
1144 		/* ok .. stupid driver, it asked for this! */
1145 		kfree(sdata);
1146 		return ret;
1147 	}
1148 
1149 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1150 
1151 	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1152 	if (ret) {
1153 		kfree(sdata);
1154 		return ret;
1155 	}
1156 
1157 	mutex_lock(&local->iflist_mtx);
1158 	rcu_assign_pointer(local->monitor_sdata, sdata);
1159 	mutex_unlock(&local->iflist_mtx);
1160 
1161 	sdata_lock(sdata);
1162 	mutex_lock(&local->mtx);
1163 	ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1164 					 IEEE80211_CHANCTX_EXCLUSIVE);
1165 	mutex_unlock(&local->mtx);
1166 	sdata_unlock(sdata);
1167 	if (ret) {
1168 		mutex_lock(&local->iflist_mtx);
1169 		RCU_INIT_POINTER(local->monitor_sdata, NULL);
1170 		mutex_unlock(&local->iflist_mtx);
1171 		synchronize_net();
1172 		drv_remove_interface(local, sdata);
1173 		mutex_destroy(&sdata->wdev.mtx);
1174 		kfree(sdata);
1175 		return ret;
1176 	}
1177 
1178 	skb_queue_head_init(&sdata->skb_queue);
1179 	skb_queue_head_init(&sdata->status_queue);
1180 	wiphy_work_init(&sdata->work, ieee80211_iface_work);
1181 
1182 	return 0;
1183 }
1184 
ieee80211_del_virtual_monitor(struct ieee80211_local * local)1185 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1186 {
1187 	struct ieee80211_sub_if_data *sdata;
1188 
1189 	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1190 		return;
1191 
1192 	ASSERT_RTNL();
1193 	lockdep_assert_wiphy(local->hw.wiphy);
1194 
1195 	mutex_lock(&local->iflist_mtx);
1196 
1197 	sdata = rcu_dereference_protected(local->monitor_sdata,
1198 					  lockdep_is_held(&local->iflist_mtx));
1199 	if (!sdata) {
1200 		mutex_unlock(&local->iflist_mtx);
1201 		return;
1202 	}
1203 
1204 	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1205 	mutex_unlock(&local->iflist_mtx);
1206 
1207 	synchronize_net();
1208 
1209 	sdata_lock(sdata);
1210 	mutex_lock(&local->mtx);
1211 	ieee80211_link_release_channel(&sdata->deflink);
1212 	mutex_unlock(&local->mtx);
1213 	sdata_unlock(sdata);
1214 
1215 	drv_remove_interface(local, sdata);
1216 
1217 	mutex_destroy(&sdata->wdev.mtx);
1218 	kfree(sdata);
1219 }
1220 
1221 /*
1222  * NOTE: Be very careful when changing this function, it must NOT return
1223  * an error on interface type changes that have been pre-checked, so most
1224  * checks should be in ieee80211_check_concurrent_iface.
1225  */
ieee80211_do_open(struct wireless_dev * wdev,bool coming_up)1226 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1227 {
1228 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1229 	struct net_device *dev = wdev->netdev;
1230 	struct ieee80211_local *local = sdata->local;
1231 	u64 changed = 0;
1232 	int res;
1233 	u32 hw_reconf_flags = 0;
1234 
1235 	switch (sdata->vif.type) {
1236 	case NL80211_IFTYPE_AP_VLAN: {
1237 		struct ieee80211_sub_if_data *master;
1238 
1239 		if (!sdata->bss)
1240 			return -ENOLINK;
1241 
1242 		mutex_lock(&local->mtx);
1243 		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1244 		mutex_unlock(&local->mtx);
1245 
1246 		master = container_of(sdata->bss,
1247 				      struct ieee80211_sub_if_data, u.ap);
1248 		sdata->control_port_protocol =
1249 			master->control_port_protocol;
1250 		sdata->control_port_no_encrypt =
1251 			master->control_port_no_encrypt;
1252 		sdata->control_port_over_nl80211 =
1253 			master->control_port_over_nl80211;
1254 		sdata->control_port_no_preauth =
1255 			master->control_port_no_preauth;
1256 		sdata->vif.cab_queue = master->vif.cab_queue;
1257 		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1258 		       sizeof(sdata->vif.hw_queue));
1259 		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1260 
1261 		mutex_lock(&local->key_mtx);
1262 		sdata->crypto_tx_tailroom_needed_cnt +=
1263 			master->crypto_tx_tailroom_needed_cnt;
1264 		mutex_unlock(&local->key_mtx);
1265 
1266 		break;
1267 		}
1268 	case NL80211_IFTYPE_AP:
1269 		sdata->bss = &sdata->u.ap;
1270 		break;
1271 	case NL80211_IFTYPE_MESH_POINT:
1272 	case NL80211_IFTYPE_STATION:
1273 	case NL80211_IFTYPE_MONITOR:
1274 	case NL80211_IFTYPE_ADHOC:
1275 	case NL80211_IFTYPE_P2P_DEVICE:
1276 	case NL80211_IFTYPE_OCB:
1277 	case NL80211_IFTYPE_NAN:
1278 		/* no special treatment */
1279 		break;
1280 	case NL80211_IFTYPE_UNSPECIFIED:
1281 	case NUM_NL80211_IFTYPES:
1282 	case NL80211_IFTYPE_P2P_CLIENT:
1283 	case NL80211_IFTYPE_P2P_GO:
1284 	case NL80211_IFTYPE_WDS:
1285 		/* cannot happen */
1286 		WARN_ON(1);
1287 		break;
1288 	}
1289 
1290 	if (local->open_count == 0) {
1291 		/* here we can consider everything in good order (again) */
1292 		local->reconfig_failure = false;
1293 
1294 		res = drv_start(local);
1295 		if (res)
1296 			goto err_del_bss;
1297 		/* we're brought up, everything changes */
1298 		hw_reconf_flags = ~0;
1299 		ieee80211_led_radio(local, true);
1300 		ieee80211_mod_tpt_led_trig(local,
1301 					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1302 	}
1303 
1304 	/*
1305 	 * Copy the hopefully now-present MAC address to
1306 	 * this interface, if it has the special null one.
1307 	 */
1308 	if (dev && is_zero_ether_addr(dev->dev_addr)) {
1309 		eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1310 		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1311 
1312 		if (!is_valid_ether_addr(dev->dev_addr)) {
1313 			res = -EADDRNOTAVAIL;
1314 			goto err_stop;
1315 		}
1316 	}
1317 
1318 	switch (sdata->vif.type) {
1319 	case NL80211_IFTYPE_AP_VLAN:
1320 		/* no need to tell driver, but set carrier and chanctx */
1321 		if (sdata->bss->active) {
1322 			ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1323 			netif_carrier_on(dev);
1324 			ieee80211_set_vif_encap_ops(sdata);
1325 		} else {
1326 			netif_carrier_off(dev);
1327 		}
1328 		break;
1329 	case NL80211_IFTYPE_MONITOR:
1330 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1331 			local->cooked_mntrs++;
1332 			break;
1333 		}
1334 
1335 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1336 			res = drv_add_interface(local, sdata);
1337 			if (res)
1338 				goto err_stop;
1339 		} else if (local->monitors == 0 && local->open_count == 0) {
1340 			res = ieee80211_add_virtual_monitor(local);
1341 			if (res)
1342 				goto err_stop;
1343 		}
1344 
1345 		/* must be before the call to ieee80211_configure_filter */
1346 		local->monitors++;
1347 		if (local->monitors == 1) {
1348 			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1349 			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1350 		}
1351 
1352 		ieee80211_adjust_monitor_flags(sdata, 1);
1353 		ieee80211_configure_filter(local);
1354 		ieee80211_recalc_offload(local);
1355 		mutex_lock(&local->mtx);
1356 		ieee80211_recalc_idle(local);
1357 		mutex_unlock(&local->mtx);
1358 
1359 		netif_carrier_on(dev);
1360 		break;
1361 	default:
1362 		if (coming_up) {
1363 			ieee80211_del_virtual_monitor(local);
1364 			ieee80211_set_sdata_offload_flags(sdata);
1365 
1366 			res = drv_add_interface(local, sdata);
1367 			if (res)
1368 				goto err_stop;
1369 
1370 			ieee80211_set_vif_encap_ops(sdata);
1371 			res = ieee80211_check_queues(sdata,
1372 				ieee80211_vif_type_p2p(&sdata->vif));
1373 			if (res)
1374 				goto err_del_interface;
1375 		}
1376 
1377 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
1378 			local->fif_pspoll++;
1379 			local->fif_probe_req++;
1380 
1381 			ieee80211_configure_filter(local);
1382 		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1383 			local->fif_probe_req++;
1384 		}
1385 
1386 		if (sdata->vif.probe_req_reg)
1387 			drv_config_iface_filter(local, sdata,
1388 						FIF_PROBE_REQ,
1389 						FIF_PROBE_REQ);
1390 
1391 		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1392 		    sdata->vif.type != NL80211_IFTYPE_NAN)
1393 			changed |= ieee80211_reset_erp_info(sdata);
1394 		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1395 						  changed);
1396 
1397 		switch (sdata->vif.type) {
1398 		case NL80211_IFTYPE_STATION:
1399 		case NL80211_IFTYPE_ADHOC:
1400 		case NL80211_IFTYPE_AP:
1401 		case NL80211_IFTYPE_MESH_POINT:
1402 		case NL80211_IFTYPE_OCB:
1403 			netif_carrier_off(dev);
1404 			break;
1405 		case NL80211_IFTYPE_P2P_DEVICE:
1406 		case NL80211_IFTYPE_NAN:
1407 			break;
1408 		default:
1409 			/* not reached */
1410 			WARN_ON(1);
1411 		}
1412 
1413 		/*
1414 		 * Set default queue parameters so drivers don't
1415 		 * need to initialise the hardware if the hardware
1416 		 * doesn't start up with sane defaults.
1417 		 * Enable QoS for anything but station interfaces.
1418 		 */
1419 		ieee80211_set_wmm_default(&sdata->deflink, true,
1420 			sdata->vif.type != NL80211_IFTYPE_STATION);
1421 	}
1422 
1423 	switch (sdata->vif.type) {
1424 	case NL80211_IFTYPE_P2P_DEVICE:
1425 		rcu_assign_pointer(local->p2p_sdata, sdata);
1426 		break;
1427 	case NL80211_IFTYPE_MONITOR:
1428 		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1429 			break;
1430 		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1431 		break;
1432 	default:
1433 		break;
1434 	}
1435 
1436 	/*
1437 	 * set_multicast_list will be invoked by the networking core
1438 	 * which will check whether any increments here were done in
1439 	 * error and sync them down to the hardware as filter flags.
1440 	 */
1441 	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1442 		atomic_inc(&local->iff_allmultis);
1443 
1444 	if (coming_up)
1445 		local->open_count++;
1446 
1447 	if (hw_reconf_flags)
1448 		ieee80211_hw_config(local, hw_reconf_flags);
1449 
1450 	ieee80211_recalc_ps(local);
1451 
1452 	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1453 
1454 	return 0;
1455  err_del_interface:
1456 	drv_remove_interface(local, sdata);
1457  err_stop:
1458 	if (!local->open_count)
1459 		drv_stop(local);
1460  err_del_bss:
1461 	sdata->bss = NULL;
1462 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1463 		mutex_lock(&local->mtx);
1464 		list_del(&sdata->u.vlan.list);
1465 		mutex_unlock(&local->mtx);
1466 	}
1467 	/* might already be clear but that doesn't matter */
1468 	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1469 	return res;
1470 }
1471 
ieee80211_if_free(struct net_device * dev)1472 static void ieee80211_if_free(struct net_device *dev)
1473 {
1474 	free_percpu(dev->tstats);
1475 }
1476 
ieee80211_if_setup(struct net_device * dev)1477 static void ieee80211_if_setup(struct net_device *dev)
1478 {
1479 	ether_setup(dev);
1480 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1481 	dev->priv_flags |= IFF_NO_QUEUE;
1482 	dev->netdev_ops = &ieee80211_dataif_ops;
1483 	dev->needs_free_netdev = true;
1484 	dev->priv_destructor = ieee80211_if_free;
1485 }
1486 
ieee80211_iface_process_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1487 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1488 					struct ieee80211_sub_if_data *sdata,
1489 					struct sk_buff *skb)
1490 {
1491 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1492 
1493 	if (ieee80211_is_action(mgmt->frame_control) &&
1494 	    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1495 		struct sta_info *sta;
1496 		int len = skb->len;
1497 
1498 		mutex_lock(&local->sta_mtx);
1499 		sta = sta_info_get_bss(sdata, mgmt->sa);
1500 		if (sta) {
1501 			switch (mgmt->u.action.u.addba_req.action_code) {
1502 			case WLAN_ACTION_ADDBA_REQ:
1503 				ieee80211_process_addba_request(local, sta,
1504 								mgmt, len);
1505 				break;
1506 			case WLAN_ACTION_ADDBA_RESP:
1507 				ieee80211_process_addba_resp(local, sta,
1508 							     mgmt, len);
1509 				break;
1510 			case WLAN_ACTION_DELBA:
1511 				ieee80211_process_delba(sdata, sta,
1512 							mgmt, len);
1513 				break;
1514 			default:
1515 				WARN_ON(1);
1516 				break;
1517 			}
1518 		}
1519 		mutex_unlock(&local->sta_mtx);
1520 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1521 		   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1522 		switch (mgmt->u.action.u.vht_group_notif.action_code) {
1523 		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1524 			struct ieee80211_rx_status *status;
1525 			enum nl80211_band band;
1526 			struct sta_info *sta;
1527 			u8 opmode;
1528 
1529 			status = IEEE80211_SKB_RXCB(skb);
1530 			band = status->band;
1531 			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1532 
1533 			mutex_lock(&local->sta_mtx);
1534 			sta = sta_info_get_bss(sdata, mgmt->sa);
1535 
1536 			if (sta)
1537 				ieee80211_vht_handle_opmode(sdata,
1538 							    &sta->deflink,
1539 							    opmode, band);
1540 
1541 			mutex_unlock(&local->sta_mtx);
1542 			break;
1543 		}
1544 		case WLAN_VHT_ACTION_GROUPID_MGMT:
1545 			ieee80211_process_mu_groups(sdata, &sdata->deflink,
1546 						    mgmt);
1547 			break;
1548 		default:
1549 			WARN_ON(1);
1550 			break;
1551 		}
1552 	} else if (ieee80211_is_action(mgmt->frame_control) &&
1553 		   mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1554 		switch (mgmt->u.action.u.s1g.action_code) {
1555 		case WLAN_S1G_TWT_TEARDOWN:
1556 		case WLAN_S1G_TWT_SETUP:
1557 			ieee80211_s1g_rx_twt_action(sdata, skb);
1558 			break;
1559 		default:
1560 			break;
1561 		}
1562 	} else if (ieee80211_is_ext(mgmt->frame_control)) {
1563 		if (sdata->vif.type == NL80211_IFTYPE_STATION)
1564 			ieee80211_sta_rx_queued_ext(sdata, skb);
1565 		else
1566 			WARN_ON(1);
1567 	} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1568 		struct ieee80211_hdr *hdr = (void *)mgmt;
1569 		struct sta_info *sta;
1570 
1571 		/*
1572 		 * So the frame isn't mgmt, but frame_control
1573 		 * is at the right place anyway, of course, so
1574 		 * the if statement is correct.
1575 		 *
1576 		 * Warn if we have other data frame types here,
1577 		 * they must not get here.
1578 		 */
1579 		WARN_ON(hdr->frame_control &
1580 				cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1581 		WARN_ON(!(hdr->seq_ctrl &
1582 				cpu_to_le16(IEEE80211_SCTL_FRAG)));
1583 		/*
1584 		 * This was a fragment of a frame, received while
1585 		 * a block-ack session was active. That cannot be
1586 		 * right, so terminate the session.
1587 		 */
1588 		mutex_lock(&local->sta_mtx);
1589 		sta = sta_info_get_bss(sdata, mgmt->sa);
1590 		if (sta) {
1591 			u16 tid = ieee80211_get_tid(hdr);
1592 
1593 			__ieee80211_stop_rx_ba_session(
1594 				sta, tid, WLAN_BACK_RECIPIENT,
1595 				WLAN_REASON_QSTA_REQUIRE_SETUP,
1596 				true);
1597 		}
1598 		mutex_unlock(&local->sta_mtx);
1599 	} else switch (sdata->vif.type) {
1600 	case NL80211_IFTYPE_STATION:
1601 		ieee80211_sta_rx_queued_mgmt(sdata, skb);
1602 		break;
1603 	case NL80211_IFTYPE_ADHOC:
1604 		ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1605 		break;
1606 	case NL80211_IFTYPE_MESH_POINT:
1607 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1608 			break;
1609 		ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1610 		break;
1611 	default:
1612 		WARN(1, "frame for unexpected interface type");
1613 		break;
1614 	}
1615 }
1616 
ieee80211_iface_process_status(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb)1617 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1618 					   struct sk_buff *skb)
1619 {
1620 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1621 
1622 	if (ieee80211_is_action(mgmt->frame_control) &&
1623 	    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1624 		switch (mgmt->u.action.u.s1g.action_code) {
1625 		case WLAN_S1G_TWT_TEARDOWN:
1626 		case WLAN_S1G_TWT_SETUP:
1627 			ieee80211_s1g_status_twt_action(sdata, skb);
1628 			break;
1629 		default:
1630 			break;
1631 		}
1632 	}
1633 }
1634 
ieee80211_iface_work(struct wiphy * wiphy,struct wiphy_work * work)1635 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1636 {
1637 	struct ieee80211_sub_if_data *sdata =
1638 		container_of(work, struct ieee80211_sub_if_data, work);
1639 	struct ieee80211_local *local = sdata->local;
1640 	struct sk_buff *skb;
1641 
1642 	if (!ieee80211_sdata_running(sdata))
1643 		return;
1644 
1645 	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1646 		return;
1647 
1648 	if (!ieee80211_can_run_worker(local))
1649 		return;
1650 
1651 	/* first process frames */
1652 	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1653 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1654 
1655 		if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1656 			ieee80211_process_tdls_channel_switch(sdata, skb);
1657 		else
1658 			ieee80211_iface_process_skb(local, sdata, skb);
1659 
1660 		kfree_skb(skb);
1661 		kcov_remote_stop();
1662 	}
1663 
1664 	/* process status queue */
1665 	while ((skb = skb_dequeue(&sdata->status_queue))) {
1666 		kcov_remote_start_common(skb_get_kcov_handle(skb));
1667 
1668 		ieee80211_iface_process_status(sdata, skb);
1669 		kfree_skb(skb);
1670 
1671 		kcov_remote_stop();
1672 	}
1673 
1674 	/* then other type-dependent work */
1675 	switch (sdata->vif.type) {
1676 	case NL80211_IFTYPE_STATION:
1677 		ieee80211_sta_work(sdata);
1678 		break;
1679 	case NL80211_IFTYPE_ADHOC:
1680 		ieee80211_ibss_work(sdata);
1681 		break;
1682 	case NL80211_IFTYPE_MESH_POINT:
1683 		if (!ieee80211_vif_is_mesh(&sdata->vif))
1684 			break;
1685 		ieee80211_mesh_work(sdata);
1686 		break;
1687 	case NL80211_IFTYPE_OCB:
1688 		ieee80211_ocb_work(sdata);
1689 		break;
1690 	default:
1691 		break;
1692 	}
1693 }
1694 
ieee80211_recalc_smps_work(struct work_struct * work)1695 static void ieee80211_recalc_smps_work(struct work_struct *work)
1696 {
1697 	struct ieee80211_sub_if_data *sdata =
1698 		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1699 
1700 	ieee80211_recalc_smps(sdata, &sdata->deflink);
1701 }
1702 
ieee80211_activate_links_work(struct work_struct * work)1703 static void ieee80211_activate_links_work(struct work_struct *work)
1704 {
1705 	struct ieee80211_sub_if_data *sdata =
1706 		container_of(work, struct ieee80211_sub_if_data,
1707 			     activate_links_work);
1708 
1709 	ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1710 }
1711 
1712 /*
1713  * Helper function to initialise an interface to a specific type.
1714  */
ieee80211_setup_sdata(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1715 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1716 				  enum nl80211_iftype type)
1717 {
1718 	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1719 						    0xff, 0xff, 0xff};
1720 
1721 	/* clear type-dependent unions */
1722 	memset(&sdata->u, 0, sizeof(sdata->u));
1723 	memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1724 
1725 	/* and set some type-dependent values */
1726 	sdata->vif.type = type;
1727 	sdata->vif.p2p = false;
1728 	sdata->wdev.iftype = type;
1729 
1730 	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1731 	sdata->control_port_no_encrypt = false;
1732 	sdata->control_port_over_nl80211 = false;
1733 	sdata->control_port_no_preauth = false;
1734 	sdata->vif.cfg.idle = true;
1735 	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1736 
1737 	sdata->noack_map = 0;
1738 
1739 	/* only monitor/p2p-device differ */
1740 	if (sdata->dev) {
1741 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1742 		sdata->dev->type = ARPHRD_ETHER;
1743 	}
1744 
1745 	skb_queue_head_init(&sdata->skb_queue);
1746 	skb_queue_head_init(&sdata->status_queue);
1747 	wiphy_work_init(&sdata->work, ieee80211_iface_work);
1748 	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1749 	INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1750 
1751 	switch (type) {
1752 	case NL80211_IFTYPE_P2P_GO:
1753 		type = NL80211_IFTYPE_AP;
1754 		sdata->vif.type = type;
1755 		sdata->vif.p2p = true;
1756 		fallthrough;
1757 	case NL80211_IFTYPE_AP:
1758 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1759 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1760 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1761 		break;
1762 	case NL80211_IFTYPE_P2P_CLIENT:
1763 		type = NL80211_IFTYPE_STATION;
1764 		sdata->vif.type = type;
1765 		sdata->vif.p2p = true;
1766 		fallthrough;
1767 	case NL80211_IFTYPE_STATION:
1768 		sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1769 		ieee80211_sta_setup_sdata(sdata);
1770 		break;
1771 	case NL80211_IFTYPE_OCB:
1772 		sdata->vif.bss_conf.bssid = bssid_wildcard;
1773 		ieee80211_ocb_setup_sdata(sdata);
1774 		break;
1775 	case NL80211_IFTYPE_ADHOC:
1776 		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1777 		ieee80211_ibss_setup_sdata(sdata);
1778 		break;
1779 	case NL80211_IFTYPE_MESH_POINT:
1780 		if (ieee80211_vif_is_mesh(&sdata->vif))
1781 			ieee80211_mesh_init_sdata(sdata);
1782 		break;
1783 	case NL80211_IFTYPE_MONITOR:
1784 		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1785 		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1786 		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1787 				      MONITOR_FLAG_OTHER_BSS;
1788 		break;
1789 	case NL80211_IFTYPE_NAN:
1790 		idr_init(&sdata->u.nan.function_inst_ids);
1791 		spin_lock_init(&sdata->u.nan.func_lock);
1792 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1793 		break;
1794 	case NL80211_IFTYPE_AP_VLAN:
1795 	case NL80211_IFTYPE_P2P_DEVICE:
1796 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1797 		break;
1798 	case NL80211_IFTYPE_UNSPECIFIED:
1799 	case NL80211_IFTYPE_WDS:
1800 	case NUM_NL80211_IFTYPES:
1801 		WARN_ON(1);
1802 		break;
1803 	}
1804 
1805 	/* need to do this after the switch so vif.type is correct */
1806 	ieee80211_link_setup(&sdata->deflink);
1807 
1808 	ieee80211_debugfs_add_netdev(sdata);
1809 }
1810 
ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1811 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1812 					   enum nl80211_iftype type)
1813 {
1814 	struct ieee80211_local *local = sdata->local;
1815 	int ret, err;
1816 	enum nl80211_iftype internal_type = type;
1817 	bool p2p = false;
1818 
1819 	ASSERT_RTNL();
1820 
1821 	if (!local->ops->change_interface)
1822 		return -EBUSY;
1823 
1824 	/* for now, don't support changing while links exist */
1825 	if (ieee80211_vif_is_mld(&sdata->vif))
1826 		return -EBUSY;
1827 
1828 	switch (sdata->vif.type) {
1829 	case NL80211_IFTYPE_AP:
1830 		if (!list_empty(&sdata->u.ap.vlans))
1831 			return -EBUSY;
1832 		break;
1833 	case NL80211_IFTYPE_STATION:
1834 	case NL80211_IFTYPE_ADHOC:
1835 	case NL80211_IFTYPE_OCB:
1836 		/*
1837 		 * Could maybe also all others here?
1838 		 * Just not sure how that interacts
1839 		 * with the RX/config path e.g. for
1840 		 * mesh.
1841 		 */
1842 		break;
1843 	default:
1844 		return -EBUSY;
1845 	}
1846 
1847 	switch (type) {
1848 	case NL80211_IFTYPE_AP:
1849 	case NL80211_IFTYPE_STATION:
1850 	case NL80211_IFTYPE_ADHOC:
1851 	case NL80211_IFTYPE_OCB:
1852 		/*
1853 		 * Could probably support everything
1854 		 * but here.
1855 		 */
1856 		break;
1857 	case NL80211_IFTYPE_P2P_CLIENT:
1858 		p2p = true;
1859 		internal_type = NL80211_IFTYPE_STATION;
1860 		break;
1861 	case NL80211_IFTYPE_P2P_GO:
1862 		p2p = true;
1863 		internal_type = NL80211_IFTYPE_AP;
1864 		break;
1865 	default:
1866 		return -EBUSY;
1867 	}
1868 
1869 	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1870 	if (ret)
1871 		return ret;
1872 
1873 	ieee80211_stop_vif_queues(local, sdata,
1874 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1875 	/* do_stop will synchronize_rcu() first thing */
1876 	ieee80211_do_stop(sdata, false);
1877 
1878 	ieee80211_teardown_sdata(sdata);
1879 
1880 	ieee80211_set_sdata_offload_flags(sdata);
1881 	ret = drv_change_interface(local, sdata, internal_type, p2p);
1882 	if (ret)
1883 		type = ieee80211_vif_type_p2p(&sdata->vif);
1884 
1885 	/*
1886 	 * Ignore return value here, there's not much we can do since
1887 	 * the driver changed the interface type internally already.
1888 	 * The warnings will hopefully make driver authors fix it :-)
1889 	 */
1890 	ieee80211_check_queues(sdata, type);
1891 
1892 	ieee80211_setup_sdata(sdata, type);
1893 	ieee80211_set_vif_encap_ops(sdata);
1894 
1895 	err = ieee80211_do_open(&sdata->wdev, false);
1896 	WARN(err, "type change: do_open returned %d", err);
1897 
1898 	ieee80211_wake_vif_queues(local, sdata,
1899 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1900 	return ret;
1901 }
1902 
ieee80211_if_change_type(struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type)1903 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1904 			     enum nl80211_iftype type)
1905 {
1906 	int ret;
1907 
1908 	ASSERT_RTNL();
1909 
1910 	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1911 		return 0;
1912 
1913 	if (ieee80211_sdata_running(sdata)) {
1914 		ret = ieee80211_runtime_change_iftype(sdata, type);
1915 		if (ret)
1916 			return ret;
1917 	} else {
1918 		/* Purge and reset type-dependent state. */
1919 		ieee80211_teardown_sdata(sdata);
1920 		ieee80211_setup_sdata(sdata, type);
1921 	}
1922 
1923 	/* reset some values that shouldn't be kept across type changes */
1924 	if (type == NL80211_IFTYPE_STATION)
1925 		sdata->u.mgd.use_4addr = false;
1926 
1927 	return 0;
1928 }
1929 
ieee80211_assign_perm_addr(struct ieee80211_local * local,u8 * perm_addr,enum nl80211_iftype type)1930 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1931 				       u8 *perm_addr, enum nl80211_iftype type)
1932 {
1933 	struct ieee80211_sub_if_data *sdata;
1934 	u64 mask, start, addr, val, inc;
1935 	u8 *m;
1936 	u8 tmp_addr[ETH_ALEN];
1937 	int i;
1938 
1939 	/* default ... something at least */
1940 	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1941 
1942 	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1943 	    local->hw.wiphy->n_addresses <= 1)
1944 		return;
1945 
1946 	mutex_lock(&local->iflist_mtx);
1947 
1948 	switch (type) {
1949 	case NL80211_IFTYPE_MONITOR:
1950 		/* doesn't matter */
1951 		break;
1952 	case NL80211_IFTYPE_AP_VLAN:
1953 		/* match up with an AP interface */
1954 		list_for_each_entry(sdata, &local->interfaces, list) {
1955 			if (sdata->vif.type != NL80211_IFTYPE_AP)
1956 				continue;
1957 			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1958 			break;
1959 		}
1960 		/* keep default if no AP interface present */
1961 		break;
1962 	case NL80211_IFTYPE_P2P_CLIENT:
1963 	case NL80211_IFTYPE_P2P_GO:
1964 		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1965 			list_for_each_entry(sdata, &local->interfaces, list) {
1966 				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1967 					continue;
1968 				if (!ieee80211_sdata_running(sdata))
1969 					continue;
1970 				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1971 				goto out_unlock;
1972 			}
1973 		}
1974 		fallthrough;
1975 	default:
1976 		/* assign a new address if possible -- try n_addresses first */
1977 		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1978 			bool used = false;
1979 
1980 			list_for_each_entry(sdata, &local->interfaces, list) {
1981 				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1982 						     sdata->vif.addr)) {
1983 					used = true;
1984 					break;
1985 				}
1986 			}
1987 
1988 			if (!used) {
1989 				memcpy(perm_addr,
1990 				       local->hw.wiphy->addresses[i].addr,
1991 				       ETH_ALEN);
1992 				break;
1993 			}
1994 		}
1995 
1996 		/* try mask if available */
1997 		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1998 			break;
1999 
2000 		m = local->hw.wiphy->addr_mask;
2001 		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2002 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2003 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2004 
2005 		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2006 			/* not a contiguous mask ... not handled now! */
2007 			pr_info("not contiguous\n");
2008 			break;
2009 		}
2010 
2011 		/*
2012 		 * Pick address of existing interface in case user changed
2013 		 * MAC address manually, default to perm_addr.
2014 		 */
2015 		m = local->hw.wiphy->perm_addr;
2016 		list_for_each_entry(sdata, &local->interfaces, list) {
2017 			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2018 				continue;
2019 			m = sdata->vif.addr;
2020 			break;
2021 		}
2022 		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2023 			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2024 			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2025 
2026 		inc = 1ULL<<__ffs64(mask);
2027 		val = (start & mask);
2028 		addr = (start & ~mask) | (val & mask);
2029 		do {
2030 			bool used = false;
2031 
2032 			tmp_addr[5] = addr >> 0*8;
2033 			tmp_addr[4] = addr >> 1*8;
2034 			tmp_addr[3] = addr >> 2*8;
2035 			tmp_addr[2] = addr >> 3*8;
2036 			tmp_addr[1] = addr >> 4*8;
2037 			tmp_addr[0] = addr >> 5*8;
2038 
2039 			val += inc;
2040 
2041 			list_for_each_entry(sdata, &local->interfaces, list) {
2042 				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2043 					used = true;
2044 					break;
2045 				}
2046 			}
2047 
2048 			if (!used) {
2049 				memcpy(perm_addr, tmp_addr, ETH_ALEN);
2050 				break;
2051 			}
2052 			addr = (start & ~mask) | (val & mask);
2053 		} while (addr != start);
2054 
2055 		break;
2056 	}
2057 
2058  out_unlock:
2059 	mutex_unlock(&local->iflist_mtx);
2060 }
2061 
ieee80211_if_add(struct ieee80211_local * local,const char * name,unsigned char name_assign_type,struct wireless_dev ** new_wdev,enum nl80211_iftype type,struct vif_params * params)2062 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2063 		     unsigned char name_assign_type,
2064 		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
2065 		     struct vif_params *params)
2066 {
2067 	struct net_device *ndev = NULL;
2068 	struct ieee80211_sub_if_data *sdata = NULL;
2069 	struct txq_info *txqi;
2070 	int ret, i;
2071 
2072 	ASSERT_RTNL();
2073 
2074 	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2075 		struct wireless_dev *wdev;
2076 
2077 		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2078 				GFP_KERNEL);
2079 		if (!sdata)
2080 			return -ENOMEM;
2081 		wdev = &sdata->wdev;
2082 
2083 		sdata->dev = NULL;
2084 		strscpy(sdata->name, name, IFNAMSIZ);
2085 		ieee80211_assign_perm_addr(local, wdev->address, type);
2086 		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2087 		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2088 	} else {
2089 		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2090 				 sizeof(void *));
2091 		int txq_size = 0;
2092 
2093 		if (type != NL80211_IFTYPE_AP_VLAN &&
2094 		    (type != NL80211_IFTYPE_MONITOR ||
2095 		     (params->flags & MONITOR_FLAG_ACTIVE)))
2096 			txq_size += sizeof(struct txq_info) +
2097 				    local->hw.txq_data_size;
2098 
2099 		ndev = alloc_netdev_mqs(size + txq_size,
2100 					name, name_assign_type,
2101 					ieee80211_if_setup, 1, 1);
2102 		if (!ndev)
2103 			return -ENOMEM;
2104 
2105 		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2106 
2107 		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2108 		if (!ndev->tstats) {
2109 			free_netdev(ndev);
2110 			return -ENOMEM;
2111 		}
2112 
2113 		ndev->needed_headroom = local->tx_headroom +
2114 					4*6 /* four MAC addresses */
2115 					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2116 					+ 6 /* mesh */
2117 					+ 8 /* rfc1042/bridge tunnel */
2118 					- ETH_HLEN /* ethernet hard_header_len */
2119 					+ IEEE80211_ENCRYPT_HEADROOM;
2120 		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2121 
2122 		ret = dev_alloc_name(ndev, ndev->name);
2123 		if (ret < 0) {
2124 			ieee80211_if_free(ndev);
2125 			free_netdev(ndev);
2126 			return ret;
2127 		}
2128 
2129 		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2130 		if (is_valid_ether_addr(params->macaddr))
2131 			eth_hw_addr_set(ndev, params->macaddr);
2132 		else
2133 			eth_hw_addr_set(ndev, ndev->perm_addr);
2134 		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2135 
2136 		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2137 		sdata = netdev_priv(ndev);
2138 		ndev->ieee80211_ptr = &sdata->wdev;
2139 		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2140 		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2141 		memcpy(sdata->name, ndev->name, IFNAMSIZ);
2142 
2143 		if (txq_size) {
2144 			txqi = netdev_priv(ndev) + size;
2145 			ieee80211_txq_init(sdata, NULL, txqi, 0);
2146 		}
2147 
2148 		sdata->dev = ndev;
2149 	}
2150 
2151 	/* initialise type-independent data */
2152 	sdata->wdev.wiphy = local->hw.wiphy;
2153 
2154 	ieee80211_sdata_init(local, sdata);
2155 
2156 	ieee80211_init_frag_cache(&sdata->frags);
2157 
2158 	INIT_LIST_HEAD(&sdata->key_list);
2159 
2160 	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2161 			  ieee80211_delayed_tailroom_dec);
2162 
2163 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
2164 		struct ieee80211_supported_band *sband;
2165 		sband = local->hw.wiphy->bands[i];
2166 		sdata->rc_rateidx_mask[i] =
2167 			sband ? (1 << sband->n_bitrates) - 1 : 0;
2168 		if (sband) {
2169 			__le16 cap;
2170 			u16 *vht_rate_mask;
2171 
2172 			memcpy(sdata->rc_rateidx_mcs_mask[i],
2173 			       sband->ht_cap.mcs.rx_mask,
2174 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2175 
2176 			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2177 			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2178 			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2179 		} else {
2180 			memset(sdata->rc_rateidx_mcs_mask[i], 0,
2181 			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2182 			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2183 			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2184 		}
2185 	}
2186 
2187 	ieee80211_set_default_queues(sdata);
2188 
2189 	sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2190 	sdata->deflink.user_power_level = local->user_power_level;
2191 
2192 	/* setup type-dependent data */
2193 	ieee80211_setup_sdata(sdata, type);
2194 
2195 	if (ndev) {
2196 		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2197 		if (type == NL80211_IFTYPE_STATION)
2198 			sdata->u.mgd.use_4addr = params->use_4addr;
2199 
2200 		ndev->features |= local->hw.netdev_features;
2201 		ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202 		ndev->hw_features |= ndev->features &
2203 					MAC80211_SUPPORTED_FEATURES_TX;
2204 		sdata->vif.netdev_features = local->hw.netdev_features;
2205 
2206 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2207 
2208 		/* MTU range is normally 256 - 2304, where the upper limit is
2209 		 * the maximum MSDU size. Monitor interfaces send and receive
2210 		 * MPDU and A-MSDU frames which may be much larger so we do
2211 		 * not impose an upper limit in that case.
2212 		 */
2213 		ndev->min_mtu = 256;
2214 		if (type == NL80211_IFTYPE_MONITOR)
2215 			ndev->max_mtu = 0;
2216 		else
2217 			ndev->max_mtu = local->hw.max_mtu;
2218 
2219 		ret = cfg80211_register_netdevice(ndev);
2220 		if (ret) {
2221 			free_netdev(ndev);
2222 			return ret;
2223 		}
2224 	}
2225 
2226 	mutex_lock(&local->iflist_mtx);
2227 	list_add_tail_rcu(&sdata->list, &local->interfaces);
2228 	mutex_unlock(&local->iflist_mtx);
2229 
2230 	if (new_wdev)
2231 		*new_wdev = &sdata->wdev;
2232 
2233 	return 0;
2234 }
2235 
ieee80211_if_remove(struct ieee80211_sub_if_data * sdata)2236 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2237 {
2238 	ASSERT_RTNL();
2239 
2240 	mutex_lock(&sdata->local->iflist_mtx);
2241 	list_del_rcu(&sdata->list);
2242 	mutex_unlock(&sdata->local->iflist_mtx);
2243 
2244 	if (sdata->vif.txq)
2245 		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2246 
2247 	synchronize_rcu();
2248 
2249 	cfg80211_unregister_wdev(&sdata->wdev);
2250 
2251 	if (!sdata->dev) {
2252 		ieee80211_teardown_sdata(sdata);
2253 		kfree(sdata);
2254 	}
2255 }
2256 
ieee80211_sdata_stop(struct ieee80211_sub_if_data * sdata)2257 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2258 {
2259 	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2260 		return;
2261 	ieee80211_do_stop(sdata, true);
2262 }
2263 
ieee80211_remove_interfaces(struct ieee80211_local * local)2264 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2265 {
2266 	struct ieee80211_sub_if_data *sdata, *tmp;
2267 	LIST_HEAD(unreg_list);
2268 
2269 	ASSERT_RTNL();
2270 
2271 	/* Before destroying the interfaces, make sure they're all stopped so
2272 	 * that the hardware is stopped. Otherwise, the driver might still be
2273 	 * iterating the interfaces during the shutdown, e.g. from a worker
2274 	 * or from RX processing or similar, and if it does so (using atomic
2275 	 * iteration) while we're manipulating the list, the iteration will
2276 	 * crash.
2277 	 *
2278 	 * After this, the hardware should be stopped and the driver should
2279 	 * have stopped all of its activities, so that we can do RCU-unaware
2280 	 * manipulations of the interface list below.
2281 	 */
2282 	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2283 
2284 	WARN(local->open_count, "%s: open count remains %d\n",
2285 	     wiphy_name(local->hw.wiphy), local->open_count);
2286 
2287 	ieee80211_txq_teardown_flows(local);
2288 
2289 	mutex_lock(&local->iflist_mtx);
2290 	list_splice_init(&local->interfaces, &unreg_list);
2291 	mutex_unlock(&local->iflist_mtx);
2292 
2293 	wiphy_lock(local->hw.wiphy);
2294 	list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2295 		bool netdev = sdata->dev;
2296 
2297 		list_del(&sdata->list);
2298 		cfg80211_unregister_wdev(&sdata->wdev);
2299 
2300 		if (!netdev)
2301 			kfree(sdata);
2302 	}
2303 	wiphy_unlock(local->hw.wiphy);
2304 }
2305 
netdev_notify(struct notifier_block * nb,unsigned long state,void * ptr)2306 static int netdev_notify(struct notifier_block *nb,
2307 			 unsigned long state, void *ptr)
2308 {
2309 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2310 	struct ieee80211_sub_if_data *sdata;
2311 
2312 	if (state != NETDEV_CHANGENAME)
2313 		return NOTIFY_DONE;
2314 
2315 	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2316 		return NOTIFY_DONE;
2317 
2318 	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2319 		return NOTIFY_DONE;
2320 
2321 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2322 	memcpy(sdata->name, dev->name, IFNAMSIZ);
2323 	ieee80211_debugfs_rename_netdev(sdata);
2324 
2325 	return NOTIFY_OK;
2326 }
2327 
2328 static struct notifier_block mac80211_netdev_notifier = {
2329 	.notifier_call = netdev_notify,
2330 };
2331 
ieee80211_iface_init(void)2332 int ieee80211_iface_init(void)
2333 {
2334 	return register_netdevice_notifier(&mac80211_netdev_notifier);
2335 }
2336 
ieee80211_iface_exit(void)2337 void ieee80211_iface_exit(void)
2338 {
2339 	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2340 }
2341 
ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data * sdata)2342 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2343 {
2344 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2345 		atomic_inc(&sdata->u.ap.num_mcast_sta);
2346 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2347 		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2348 }
2349 
ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data * sdata)2350 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2351 {
2352 	if (sdata->vif.type == NL80211_IFTYPE_AP)
2353 		atomic_dec(&sdata->u.ap.num_mcast_sta);
2354 	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2355 		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2356 }
2357