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) 2018-2024 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 *and* wiphy mutex
37	* *and* iflist_mtx
38	* (2) 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 wiphy mutex, the iflist_mtx or RCU.
43	*/
44
45	static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
46
47	bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
48	{
49	struct ieee80211_chanctx_conf *chanctx_conf;
50	int power;
51
52	rcu_read_lock();
53	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
54	if (!chanctx_conf) {
55	rcu_read_unlock();
56	return false;
57	}
58
59	power = ieee80211_chandef_max_power(chandef: &chanctx_conf->def);
60	rcu_read_unlock();
61
62	if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
63	power = min(power, sdata->deflink.user_power_level);
64
65	if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
66	power = min(power, sdata->deflink.ap_power_level);
67
68	if (power != sdata->vif.bss_conf.txpower) {
69	sdata->vif.bss_conf.txpower = power;
70	ieee80211_hw_config(local: sdata->local, changed: 0);
71	return true;
72	}
73
74	return false;
75	}
76
77	void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
78	bool update_bss)
79	{
80	if (__ieee80211_recalc_txpower(sdata) ||
81	(update_bss && ieee80211_sdata_running(sdata)))
82	ieee80211_link_info_change_notify(sdata, link: &sdata->deflink,
83	changed: BSS_CHANGED_TXPOWER);
84	}
85
86	static u32 __ieee80211_idle_off(struct ieee80211_local *local)
87	{
88	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
89	return 0;
90
91	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
92	return IEEE80211_CONF_CHANGE_IDLE;
93	}
94
95	static u32 __ieee80211_idle_on(struct ieee80211_local *local)
96	{
97	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
98	return 0;
99
100	ieee80211_flush_queues(local, NULL, drop: false);
101
102	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
103	return IEEE80211_CONF_CHANGE_IDLE;
104	}
105
106	static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
107	bool force_active)
108	{
109	bool working, scanning, active;
110	unsigned int led_trig_start = 0, led_trig_stop = 0;
111
112	lockdep_assert_wiphy(local->hw.wiphy);
113
114	active = force_active ||
115	!list_empty(head: &local->chanctx_list) ||
116	local->monitors;
117
118	working = !local->ops->remain_on_channel &&
119	!list_empty(head: &local->roc_list);
120
121	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
122	test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
123
124	if (working || scanning)
125	led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
126	else
127	led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
128
129	if (active)
130	led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
131	else
132	led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
133
134	ieee80211_mod_tpt_led_trig(local, types_on: led_trig_start, types_off: 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, force_active: true);
144	}
145
146	void ieee80211_recalc_idle(struct ieee80211_local *local)
147	{
148	u32 change = __ieee80211_recalc_idle(local, force_active: false);
149	if (change)
150	ieee80211_hw_config(local, changed: change);
151	}
152
153	static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
154	bool check_dup)
155	{
156	struct ieee80211_local *local = sdata->local;
157	struct ieee80211_sub_if_data *iter;
158	u64 new, mask, tmp;
159	u8 *m;
160	int ret = 0;
161
162	lockdep_assert_wiphy(local->hw.wiphy);
163
164	if (is_zero_ether_addr(addr: local->hw.wiphy->addr_mask))
165	return 0;
166
167	m = addr;
168	new = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
169	((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
170	((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
171
172	m = local->hw.wiphy->addr_mask;
173	mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
174	((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
175	((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
176
177	if (!check_dup)
178	return ret;
179
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
199	return ret;
200	}
201
202	static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
203	{
204	struct ieee80211_roc_work *roc;
205	struct ieee80211_local *local = sdata->local;
206	struct ieee80211_sub_if_data *scan_sdata;
207	int ret = 0;
208
209	lockdep_assert_wiphy(local->hw.wiphy);
210
211	/* To be the most flexible here we want to only limit changing the
212	* address if the specific interface is doing offchannel work or
213	* scanning.
214	*/
215	if (netif_carrier_ok(dev: sdata->dev))
216	return -EBUSY;
217
218	/* First check no ROC work is happening on this iface */
219	list_for_each_entry(roc, &local->roc_list, list) {
220	if (roc->sdata != sdata)
221	continue;
222
223	if (roc->started) {
224	ret = -EBUSY;
225	goto unlock;
226	}
227	}
228
229	/* And if this iface is scanning */
230	if (local->scanning) {
231	scan_sdata = rcu_dereference_protected(local->scan_sdata,
232	lockdep_is_held(&local->hw.wiphy->mtx));
233	if (sdata == scan_sdata)
234	ret = -EBUSY;
235	}
236
237	switch (sdata->vif.type) {
238	case NL80211_IFTYPE_STATION:
239	case NL80211_IFTYPE_P2P_CLIENT:
240	/* More interface types could be added here but changing the
241	* address while powered makes the most sense in client modes.
242	*/
243	break;
244	default:
245	ret = -EOPNOTSUPP;
246	}
247
248	unlock:
249	return ret;
250	}
251
252	static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
253	void *addr)
254	{
255	struct ieee80211_local *local = sdata->local;
256	struct sockaddr *sa = addr;
257	bool check_dup = true;
258	bool live = false;
259	int ret;
260
261	if (ieee80211_sdata_running(sdata)) {
262	ret = ieee80211_can_powered_addr_change(sdata);
263	if (ret)
264	return ret;
265
266	live = true;
267	}
268
269	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
270	!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
271	check_dup = false;
272
273	ret = ieee80211_verify_mac(sdata, addr: sa->sa_data, check_dup);
274	if (ret)
275	return ret;
276
277	if (live)
278	drv_remove_interface(local, sdata);
279	ret = eth_mac_addr(dev: sdata->dev, p: sa);
280
281	if (ret == 0) {
282	memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
283	ether_addr_copy(dst: sdata->vif.bss_conf.addr, src: sdata->vif.addr);
284	}
285
286	/* Regardless of eth_mac_addr() return we still want to add the
287	* interface back. This should not fail...
288	*/
289	if (live)
290	WARN_ON(drv_add_interface(local, sdata));
291
292	return ret;
293	}
294
295	static int ieee80211_change_mac(struct net_device *dev, void *addr)
296	{
297	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
298	struct ieee80211_local *local = sdata->local;
299	int ret;
300
301	/*
302	* This happens during unregistration if there's a bond device
303	* active (maybe other cases?) and we must get removed from it.
304	* But we really don't care anymore if it's not registered now.
305	*/
306	if (!dev->ieee80211_ptr->registered)
307	return 0;
308
309	wiphy_lock(wiphy: local->hw.wiphy);
310	ret = _ieee80211_change_mac(sdata, addr);
311	wiphy_unlock(wiphy: local->hw.wiphy);
312
313	return ret;
314	}
315
316	static inline int identical_mac_addr_allowed(int type1, int type2)
317	{
318	return type1 == NL80211_IFTYPE_MONITOR ||
319	type2 == NL80211_IFTYPE_MONITOR ||
320	type1 == NL80211_IFTYPE_P2P_DEVICE ||
321	type2 == NL80211_IFTYPE_P2P_DEVICE ||
322	(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
323	(type1 == NL80211_IFTYPE_AP_VLAN &&
324	(type2 == NL80211_IFTYPE_AP ||
325	type2 == NL80211_IFTYPE_AP_VLAN));
326	}
327
328	static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
329	enum nl80211_iftype iftype)
330	{
331	struct ieee80211_local *local = sdata->local;
332	struct ieee80211_sub_if_data *nsdata;
333
334	ASSERT_RTNL();
335	lockdep_assert_wiphy(local->hw.wiphy);
336
337	/* we hold the RTNL here so can safely walk the list */
338	list_for_each_entry(nsdata, &local->interfaces, list) {
339	if (nsdata != sdata && ieee80211_sdata_running(sdata: nsdata)) {
340	/*
341	* Only OCB and monitor mode may coexist
342	*/
343	if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
344	nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
345	(sdata->vif.type != NL80211_IFTYPE_MONITOR &&
346	nsdata->vif.type == NL80211_IFTYPE_OCB))
347	return -EBUSY;
348
349	/*
350	* Allow only a single IBSS interface to be up at any
351	* time. This is restricted because beacon distribution
352	* cannot work properly if both are in the same IBSS.
353	*
354	* To remove this restriction we'd have to disallow them
355	* from setting the same SSID on different IBSS interfaces
356	* belonging to the same hardware. Then, however, we're
357	* faced with having to adopt two different TSF timers...
358	*/
359	if (iftype == NL80211_IFTYPE_ADHOC &&
360	nsdata->vif.type == NL80211_IFTYPE_ADHOC)
361	return -EBUSY;
362	/*
363	* will not add another interface while any channel
364	* switch is active.
365	*/
366	if (nsdata->vif.bss_conf.csa_active)
367	return -EBUSY;
368
369	/*
370	* The remaining checks are only performed for interfaces
371	* with the same MAC address.
372	*/
373	if (!ether_addr_equal(addr1: sdata->vif.addr,
374	addr2: nsdata->vif.addr))
375	continue;
376
377	/*
378	* check whether it may have the same address
379	*/
380	if (!identical_mac_addr_allowed(type1: iftype,
381	type2: nsdata->vif.type))
382	return -ENOTUNIQ;
383
384	/* No support for VLAN with MLO yet */
385	if (iftype == NL80211_IFTYPE_AP_VLAN &&
386	sdata->wdev.use_4addr &&
387	nsdata->vif.type == NL80211_IFTYPE_AP &&
388	nsdata->vif.valid_links)
389	return -EOPNOTSUPP;
390
391	/*
392	* can only add VLANs to enabled APs
393	*/
394	if (iftype == NL80211_IFTYPE_AP_VLAN &&
395	nsdata->vif.type == NL80211_IFTYPE_AP)
396	sdata->bss = &nsdata->u.ap;
397	}
398	}
399
400	return ieee80211_check_combinations(sdata, NULL, chanmode: 0, radar_detect: 0);
401	}
402
403	static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
404	enum nl80211_iftype iftype)
405	{
406	int n_queues = sdata->local->hw.queues;
407	int i;
408
409	if (iftype == NL80211_IFTYPE_NAN)
410	return 0;
411
412	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
413	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
414	if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
415	IEEE80211_INVAL_HW_QUEUE))
416	return -EINVAL;
417	if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
418	n_queues))
419	return -EINVAL;
420	}
421	}
422
423	if ((iftype != NL80211_IFTYPE_AP &&
424	iftype != NL80211_IFTYPE_P2P_GO &&
425	iftype != NL80211_IFTYPE_MESH_POINT) ||
426	!ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
427	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
428	return 0;
429	}
430
431	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
432	return -EINVAL;
433
434	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
435	return -EINVAL;
436
437	return 0;
438	}
439
440	static int ieee80211_open(struct net_device *dev)
441	{
442	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
443	int err;
444
445	/* fail early if user set an invalid address */
446	if (!is_valid_ether_addr(addr: dev->dev_addr))
447	return -EADDRNOTAVAIL;
448
449	wiphy_lock(wiphy: sdata->local->hw.wiphy);
450	err = ieee80211_check_concurrent_iface(sdata, iftype: sdata->vif.type);
451	if (err)
452	goto out;
453
454	err = ieee80211_do_open(wdev: &sdata->wdev, coming_up: true);
455	out:
456	wiphy_unlock(wiphy: sdata->local->hw.wiphy);
457
458	return err;
459	}
460
461	static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
462	{
463	struct ieee80211_local *local = sdata->local;
464	unsigned long flags;
465	struct sk_buff *skb, *tmp;
466	u32 hw_reconf_flags = 0;
467	int i, flushed;
468	struct ps_data *ps;
469	struct cfg80211_chan_def chandef;
470	bool cancel_scan;
471	struct cfg80211_nan_func *func;
472
473	lockdep_assert_wiphy(local->hw.wiphy);
474
475	clear_bit(nr: SDATA_STATE_RUNNING, addr: &sdata->state);
476	synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
477
478	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
479	if (cancel_scan)
480	ieee80211_scan_cancel(local);
481
482	ieee80211_roc_purge(local, sdata);
483
484	switch (sdata->vif.type) {
485	case NL80211_IFTYPE_STATION:
486	ieee80211_mgd_stop(sdata);
487	break;
488	case NL80211_IFTYPE_ADHOC:
489	ieee80211_ibss_stop(sdata);
490	break;
491	case NL80211_IFTYPE_MONITOR:
492	if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
493	break;
494	list_del_rcu(entry: &sdata->u.mntr.list);
495	break;
496	default:
497	break;
498	}
499
500	/*
501	* Remove all stations associated with this interface.
502	*
503	* This must be done before calling ops->remove_interface()
504	* because otherwise we can later invoke ops->sta_notify()
505	* whenever the STAs are removed, and that invalidates driver
506	* assumptions about always getting a vif pointer that is valid
507	* (because if we remove a STA after ops->remove_interface()
508	* the driver will have removed the vif info already!)
509	*
510	* For AP_VLANs stations may exist since there's nothing else that
511	* would have removed them, but in other modes there shouldn't
512	* be any stations.
513	*/
514	flushed = sta_info_flush(sdata, link_id: -1);
515	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
516
517	/* don't count this interface for allmulti while it is down */
518	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
519	atomic_dec(v: &local->iff_allmultis);
520
521	if (sdata->vif.type == NL80211_IFTYPE_AP) {
522	local->fif_pspoll--;
523	local->fif_probe_req--;
524	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
525	local->fif_probe_req--;
526	}
527
528	if (sdata->dev) {
529	netif_addr_lock_bh(dev: sdata->dev);
530	spin_lock_bh(lock: &local->filter_lock);
531	__hw_addr_unsync(to_list: &local->mc_list, from_list: &sdata->dev->mc,
532	addr_len: sdata->dev->addr_len);
533	spin_unlock_bh(lock: &local->filter_lock);
534	netif_addr_unlock_bh(dev: sdata->dev);
535	}
536
537	del_timer_sync(timer: &local->dynamic_ps_timer);
538	wiphy_work_cancel(wiphy: local->hw.wiphy, work: &local->dynamic_ps_enable_work);
539
540	WARN(ieee80211_vif_is_mld(&sdata->vif),
541	"destroying interface with valid links 0x%04x\n",
542	sdata->vif.valid_links);
543
544	sdata->vif.bss_conf.csa_active = false;
545	if (sdata->vif.type == NL80211_IFTYPE_STATION)
546	sdata->deflink.u.mgd.csa_waiting_bcn = false;
547	if (sdata->csa_blocked_tx) {
548	ieee80211_wake_vif_queues(local, sdata,
549	reason: IEEE80211_QUEUE_STOP_REASON_CSA);
550	sdata->csa_blocked_tx = false;
551	}
552
553	wiphy_work_cancel(wiphy: local->hw.wiphy, work: &sdata->deflink.csa_finalize_work);
554	wiphy_work_cancel(wiphy: local->hw.wiphy,
555	work: &sdata->deflink.color_change_finalize_work);
556	wiphy_delayed_work_cancel(wiphy: local->hw.wiphy,
557	dwork: &sdata->deflink.dfs_cac_timer_work);
558
559	if (sdata->wdev.cac_started) {
560	chandef = sdata->vif.bss_conf.chanreq.oper;
561	WARN_ON(local->suspended);
562	ieee80211_link_release_channel(link: &sdata->deflink);
563	cfg80211_cac_event(netdev: sdata->dev, chandef: &chandef,
564	event: NL80211_RADAR_CAC_ABORTED,
565	GFP_KERNEL);
566	}
567
568	if (sdata->vif.type == NL80211_IFTYPE_AP) {
569	WARN_ON(!list_empty(&sdata->u.ap.vlans));
570	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
571	/* remove all packets in parent bc_buf pointing to this dev */
572	ps = &sdata->bss->ps;
573
574	spin_lock_irqsave(&ps->bc_buf.lock, flags);
575	skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
576	if (skb->dev == sdata->dev) {
577	__skb_unlink(skb, list: &ps->bc_buf);
578	local->total_ps_buffered--;
579	ieee80211_free_txskb(hw: &local->hw, skb);
580	}
581	}
582	spin_unlock_irqrestore(lock: &ps->bc_buf.lock, flags);
583	}
584
585	if (going_down)
586	local->open_count--;
587
588	switch (sdata->vif.type) {
589	case NL80211_IFTYPE_AP_VLAN:
590	list_del(entry: &sdata->u.vlan.list);
591	RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
592	/* see comment in the default case below */
593	ieee80211_free_keys(sdata, force_synchronize: true);
594	/* no need to tell driver */
595	break;
596	case NL80211_IFTYPE_MONITOR:
597	if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
598	local->cooked_mntrs--;
599	break;
600	}
601
602	local->monitors--;
603	if (local->monitors == 0) {
604	local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
605	hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
606	}
607
608	ieee80211_adjust_monitor_flags(sdata, offset: -1);
609	break;
610	case NL80211_IFTYPE_NAN:
611	/* clean all the functions */
612	spin_lock_bh(lock: &sdata->u.nan.func_lock);
613
614	idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
615	idr_remove(&sdata->u.nan.function_inst_ids, id: i);
616	cfg80211_free_nan_func(f: func);
617	}
618	idr_destroy(&sdata->u.nan.function_inst_ids);
619
620	spin_unlock_bh(lock: &sdata->u.nan.func_lock);
621	break;
622	case NL80211_IFTYPE_P2P_DEVICE:
623	/* relies on synchronize_rcu() below */
624	RCU_INIT_POINTER(local->p2p_sdata, NULL);
625	fallthrough;
626	default:
627	wiphy_work_cancel(wiphy: sdata->local->hw.wiphy, work: &sdata->work);
628	/*
629	* When we get here, the interface is marked down.
630	* Free the remaining keys, if there are any
631	* (which can happen in AP mode if userspace sets
632	* keys before the interface is operating)
633	*
634	* Force the key freeing to always synchronize_net()
635	* to wait for the RX path in case it is using this
636	* interface enqueuing frames at this very time on
637	* another CPU.
638	*/
639	ieee80211_free_keys(sdata, force_synchronize: true);
640	skb_queue_purge(list: &sdata->skb_queue);
641	skb_queue_purge(list: &sdata->status_queue);
642	}
643
644	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
645	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
646	skb_queue_walk_safe(&local->pending[i], skb, tmp) {
647	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
648	if (info->control.vif == &sdata->vif) {
649	__skb_unlink(skb, list: &local->pending[i]);
650	ieee80211_free_txskb(hw: &local->hw, skb);
651	}
652	}
653	}
654	spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
655
656	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
657	ieee80211_txq_remove_vlan(local, sdata);
658
659	sdata->bss = NULL;
660
661	if (local->open_count == 0)
662	ieee80211_clear_tx_pending(local);
663
664	sdata->vif.bss_conf.beacon_int = 0;
665
666	/*
667	* If the interface goes down while suspended, presumably because
668	* the device was unplugged and that happens before our resume,
669	* then the driver is already unconfigured and the remainder of
670	* this function isn't needed.
671	* XXX: what about WoWLAN? If the device has software state, e.g.
672	* memory allocated, it might expect teardown commands from
673	* mac80211 here?
674	*/
675	if (local->suspended) {
676	WARN_ON(local->wowlan);
677	WARN_ON(rcu_access_pointer(local->monitor_sdata));
678	return;
679	}
680
681	switch (sdata->vif.type) {
682	case NL80211_IFTYPE_AP_VLAN:
683	break;
684	case NL80211_IFTYPE_MONITOR:
685	if (local->monitors == 0)
686	ieee80211_del_virtual_monitor(local);
687
688	ieee80211_recalc_idle(local);
689
690	if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
691	break;
692
693	fallthrough;
694	default:
695	if (going_down)
696	drv_remove_interface(local, sdata);
697	}
698
699	ieee80211_recalc_ps(local);
700
701	if (cancel_scan)
702	wiphy_delayed_work_flush(wiphy: local->hw.wiphy, dwork: &local->scan_work);
703
704	if (local->open_count == 0) {
705	ieee80211_stop_device(local);
706
707	/* no reconfiguring after stop! */
708	return;
709	}
710
711	/* do after stop to avoid reconfiguring when we stop anyway */
712	ieee80211_configure_filter(local);
713	ieee80211_hw_config(local, changed: hw_reconf_flags);
714
715	if (local->monitors == local->open_count)
716	ieee80211_add_virtual_monitor(local);
717	}
718
719	static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
720	{
721	struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
722	struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
723
724	if (!tx_vif)
725	return;
726
727	tx_sdata = vif_to_sdata(p: tx_vif);
728	sdata->vif.mbssid_tx_vif = NULL;
729
730	list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
731	&tx_sdata->local->interfaces, list) {
732	if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
733	non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
734	ieee80211_sdata_running(sdata: non_tx_sdata)) {
735	non_tx_sdata->vif.mbssid_tx_vif = NULL;
736	dev_close(dev: non_tx_sdata->wdev.netdev);
737	}
738	}
739
740	if (sdata != tx_sdata && ieee80211_sdata_running(sdata: tx_sdata)) {
741	tx_sdata->vif.mbssid_tx_vif = NULL;
742	dev_close(dev: tx_sdata->wdev.netdev);
743	}
744	}
745
746	static int ieee80211_stop(struct net_device *dev)
747	{
748	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
749
750	/* close dependent VLAN and MBSSID interfaces before locking wiphy */
751	if (sdata->vif.type == NL80211_IFTYPE_AP) {
752	struct ieee80211_sub_if_data *vlan, *tmpsdata;
753
754	list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
755	u.vlan.list)
756	dev_close(dev: vlan->dev);
757
758	ieee80211_stop_mbssid(sdata);
759	}
760
761	wiphy_lock(wiphy: sdata->local->hw.wiphy);
762	wiphy_work_cancel(wiphy: sdata->local->hw.wiphy, work: &sdata->activate_links_work);
763
764	ieee80211_do_stop(sdata, going_down: true);
765	wiphy_unlock(wiphy: sdata->local->hw.wiphy);
766
767	return 0;
768	}
769
770	static void ieee80211_set_multicast_list(struct net_device *dev)
771	{
772	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
773	struct ieee80211_local *local = sdata->local;
774	int allmulti, sdata_allmulti;
775
776	allmulti = !!(dev->flags & IFF_ALLMULTI);
777	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
778
779	if (allmulti != sdata_allmulti) {
780	if (dev->flags & IFF_ALLMULTI)
781	atomic_inc(v: &local->iff_allmultis);
782	else
783	atomic_dec(v: &local->iff_allmultis);
784	sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
785	}
786
787	spin_lock_bh(lock: &local->filter_lock);
788	__hw_addr_sync(to_list: &local->mc_list, from_list: &dev->mc, addr_len: dev->addr_len);
789	spin_unlock_bh(lock: &local->filter_lock);
790	wiphy_work_queue(wiphy: local->hw.wiphy, work: &local->reconfig_filter);
791	}
792
793	/*
794	* Called when the netdev is removed or, by the code below, before
795	* the interface type changes.
796	*/
797	static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
798	{
799	/* free extra data */
800	ieee80211_free_keys(sdata, force_synchronize: false);
801
802	ieee80211_debugfs_remove_netdev(sdata);
803
804	ieee80211_destroy_frag_cache(cache: &sdata->frags);
805
806	if (ieee80211_vif_is_mesh(vif: &sdata->vif))
807	ieee80211_mesh_teardown_sdata(sdata);
808
809	ieee80211_vif_clear_links(sdata);
810	ieee80211_link_stop(link: &sdata->deflink);
811	}
812
813	static void ieee80211_uninit(struct net_device *dev)
814	{
815	ieee80211_teardown_sdata(sdata: IEEE80211_DEV_TO_SUB_IF(dev));
816	}
817
818	static void
819	ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
820	{
821	dev_fetch_sw_netstats(s: stats, netstats: dev->tstats);
822	}
823
824	static int ieee80211_netdev_setup_tc(struct net_device *dev,
825	enum tc_setup_type type, void *type_data)
826	{
827	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
828	struct ieee80211_local *local = sdata->local;
829
830	return drv_net_setup_tc(local, sdata, dev, type, type_data);
831	}
832
833	static const struct net_device_ops ieee80211_dataif_ops = {
834	.ndo_open = ieee80211_open,
835	.ndo_stop = ieee80211_stop,
836	.ndo_uninit = ieee80211_uninit,
837	.ndo_start_xmit = ieee80211_subif_start_xmit,
838	.ndo_set_rx_mode = ieee80211_set_multicast_list,
839	.ndo_set_mac_address = ieee80211_change_mac,
840	.ndo_get_stats64 = ieee80211_get_stats64,
841	.ndo_setup_tc = ieee80211_netdev_setup_tc,
842	};
843
844	static u16 ieee80211_monitor_select_queue(struct net_device *dev,
845	struct sk_buff *skb,
846	struct net_device *sb_dev)
847	{
848	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
849	struct ieee80211_local *local = sdata->local;
850	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
851	struct ieee80211_hdr *hdr;
852	int len_rthdr;
853
854	if (local->hw.queues < IEEE80211_NUM_ACS)
855	return 0;
856
857	/* reset flags and info before parsing radiotap header */
858	memset(info, 0, sizeof(*info));
859
860	if (!ieee80211_parse_tx_radiotap(skb, dev))
861	return 0; /* doesn't matter, frame will be dropped */
862
863	len_rthdr = ieee80211_get_radiotap_len(data: skb->data);
864	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
865	if (skb->len < len_rthdr + 2 ||
866	skb->len < len_rthdr + ieee80211_hdrlen(fc: hdr->frame_control))
867	return 0; /* doesn't matter, frame will be dropped */
868
869	return ieee80211_select_queue_80211(sdata, skb, hdr);
870	}
871
872	static const struct net_device_ops ieee80211_monitorif_ops = {
873	.ndo_open = ieee80211_open,
874	.ndo_stop = ieee80211_stop,
875	.ndo_uninit = ieee80211_uninit,
876	.ndo_start_xmit = ieee80211_monitor_start_xmit,
877	.ndo_set_rx_mode = ieee80211_set_multicast_list,
878	.ndo_set_mac_address = ieee80211_change_mac,
879	.ndo_select_queue = ieee80211_monitor_select_queue,
880	.ndo_get_stats64 = ieee80211_get_stats64,
881	};
882
883	static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
884	struct net_device_path *path)
885	{
886	struct ieee80211_sub_if_data *sdata;
887	struct ieee80211_local *local;
888	struct sta_info *sta;
889	int ret = -ENOENT;
890
891	sdata = IEEE80211_DEV_TO_SUB_IF(dev: ctx->dev);
892	local = sdata->local;
893
894	if (!local->ops->net_fill_forward_path)
895	return -EOPNOTSUPP;
896
897	rcu_read_lock();
898	switch (sdata->vif.type) {
899	case NL80211_IFTYPE_AP_VLAN:
900	sta = rcu_dereference(sdata->u.vlan.sta);
901	if (sta)
902	break;
903	if (sdata->wdev.use_4addr)
904	goto out;
905	if (is_multicast_ether_addr(addr: ctx->daddr))
906	goto out;
907	sta = sta_info_get_bss(sdata, addr: ctx->daddr);
908	break;
909	case NL80211_IFTYPE_AP:
910	if (is_multicast_ether_addr(addr: ctx->daddr))
911	goto out;
912	sta = sta_info_get(sdata, addr: ctx->daddr);
913	break;
914	case NL80211_IFTYPE_STATION:
915	if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
916	sta = sta_info_get(sdata, addr: ctx->daddr);
917	if (sta && test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER)) {
918	if (!test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER_AUTH))
919	goto out;
920
921	break;
922	}
923	}
924
925	sta = sta_info_get(sdata, addr: sdata->deflink.u.mgd.bssid);
926	break;
927	default:
928	goto out;
929	}
930
931	if (!sta)
932	goto out;
933
934	ret = drv_net_fill_forward_path(local, sdata, sta: &sta->sta, ctx, path);
935	out:
936	rcu_read_unlock();
937
938	return ret;
939	}
940
941	static const struct net_device_ops ieee80211_dataif_8023_ops = {
942	.ndo_open = ieee80211_open,
943	.ndo_stop = ieee80211_stop,
944	.ndo_uninit = ieee80211_uninit,
945	.ndo_start_xmit = ieee80211_subif_start_xmit_8023,
946	.ndo_set_rx_mode = ieee80211_set_multicast_list,
947	.ndo_set_mac_address = ieee80211_change_mac,
948	.ndo_get_stats64 = ieee80211_get_stats64,
949	.ndo_fill_forward_path = ieee80211_netdev_fill_forward_path,
950	.ndo_setup_tc = ieee80211_netdev_setup_tc,
951	};
952
953	static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
954	{
955	switch (iftype) {
956	/* P2P GO and client are mapped to AP/STATION types */
957	case NL80211_IFTYPE_AP:
958	case NL80211_IFTYPE_STATION:
959	return true;
960	default:
961	return false;
962	}
963	}
964
965	static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
966	{
967	struct ieee80211_local *local = sdata->local;
968	u32 flags;
969
970	flags = sdata->vif.offload_flags;
971
972	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
973	ieee80211_iftype_supports_hdr_offload(iftype: sdata->vif.type)) {
974	flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
975
976	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
977	local->hw.wiphy->frag_threshold != (u32)-1)
978	flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
979
980	if (local->monitors)
981	flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
982	} else {
983	flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
984	}
985
986	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
987	ieee80211_iftype_supports_hdr_offload(iftype: sdata->vif.type)) {
988	flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
989
990	if (local->monitors &&
991	!ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
992	flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
993	} else {
994	flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
995	}
996
997	if (sdata->vif.offload_flags == flags)
998	return false;
999
1000	sdata->vif.offload_flags = flags;
1001	ieee80211_check_fast_rx_iface(sdata);
1002	return true;
1003	}
1004
1005	static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1006	{
1007	struct ieee80211_local *local = sdata->local;
1008	struct ieee80211_sub_if_data *bss = sdata;
1009	bool enabled;
1010
1011	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1012	if (!sdata->bss)
1013	return;
1014
1015	bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1016	}
1017
1018	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1019	!ieee80211_iftype_supports_hdr_offload(iftype: bss->vif.type))
1020	return;
1021
1022	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1023	if (sdata->wdev.use_4addr &&
1024	!(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1025	enabled = false;
1026
1027	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1028	&ieee80211_dataif_ops;
1029	}
1030
1031	static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1032	{
1033	struct ieee80211_local *local = sdata->local;
1034	struct ieee80211_sub_if_data *vsdata;
1035
1036	if (ieee80211_set_sdata_offload_flags(sdata)) {
1037	drv_update_vif_offload(local, sdata);
1038	ieee80211_set_vif_encap_ops(sdata);
1039	}
1040
1041	list_for_each_entry(vsdata, &local->interfaces, list) {
1042	if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1043	vsdata->bss != &sdata->u.ap)
1044	continue;
1045
1046	ieee80211_set_vif_encap_ops(sdata: vsdata);
1047	}
1048	}
1049
1050	void ieee80211_recalc_offload(struct ieee80211_local *local)
1051	{
1052	struct ieee80211_sub_if_data *sdata;
1053
1054	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1055	return;
1056
1057	lockdep_assert_wiphy(local->hw.wiphy);
1058
1059	list_for_each_entry(sdata, &local->interfaces, list) {
1060	if (!ieee80211_sdata_running(sdata))
1061	continue;
1062
1063	ieee80211_recalc_sdata_offload(sdata);
1064	}
1065	}
1066
1067	void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1068	const int offset)
1069	{
1070	struct ieee80211_local *local = sdata->local;
1071	u32 flags = sdata->u.mntr.flags;
1072
1073	#define ADJUST(_f, _s) do { \
1074	if (flags & MONITOR_FLAG_##_f) \
1075	local->fif_##_s += offset; \
1076	} while (0)
1077
1078	ADJUST(FCSFAIL, fcsfail);
1079	ADJUST(PLCPFAIL, plcpfail);
1080	ADJUST(CONTROL, control);
1081	ADJUST(CONTROL, pspoll);
1082	ADJUST(OTHER_BSS, other_bss);
1083
1084	#undef ADJUST
1085	}
1086
1087	static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1088	{
1089	struct ieee80211_local *local = sdata->local;
1090	int i;
1091
1092	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1093	if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1094	sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1095	else if (local->hw.queues >= IEEE80211_NUM_ACS)
1096	sdata->vif.hw_queue[i] = i;
1097	else
1098	sdata->vif.hw_queue[i] = 0;
1099	}
1100	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1101	}
1102
1103	static void ieee80211_sdata_init(struct ieee80211_local *local,
1104	struct ieee80211_sub_if_data *sdata)
1105	{
1106	sdata->local = local;
1107
1108	/*
1109	* Initialize the default link, so we can use link_id 0 for non-MLD,
1110	* and that continues to work for non-MLD-aware drivers that use just
1111	* vif.bss_conf instead of vif.link_conf.
1112	*
1113	* Note that we never change this, so if link ID 0 isn't used in an
1114	* MLD connection, we get a separate allocation for it.
1115	*/
1116	ieee80211_link_init(sdata, link_id: -1, link: &sdata->deflink, link_conf: &sdata->vif.bss_conf);
1117	}
1118
1119	int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1120	{
1121	struct ieee80211_sub_if_data *sdata;
1122	int ret;
1123
1124	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1125	return 0;
1126
1127	ASSERT_RTNL();
1128	lockdep_assert_wiphy(local->hw.wiphy);
1129
1130	if (local->monitor_sdata)
1131	return 0;
1132
1133	sdata = kzalloc(size: sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1134	if (!sdata)
1135	return -ENOMEM;
1136
1137	/* set up data */
1138	sdata->vif.type = NL80211_IFTYPE_MONITOR;
1139	snprintf(buf: sdata->name, IFNAMSIZ, fmt: "%s-monitor",
1140	wiphy_name(wiphy: local->hw.wiphy));
1141	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1142	sdata->wdev.wiphy = local->hw.wiphy;
1143
1144	ieee80211_sdata_init(local, sdata);
1145
1146	ieee80211_set_default_queues(sdata);
1147
1148	ret = drv_add_interface(local, sdata);
1149	if (WARN_ON(ret)) {
1150	/* ok .. stupid driver, it asked for this! */
1151	kfree(objp: sdata);
1152	return ret;
1153	}
1154
1155	set_bit(nr: SDATA_STATE_RUNNING, addr: &sdata->state);
1156
1157	ret = ieee80211_check_queues(sdata, iftype: NL80211_IFTYPE_MONITOR);
1158	if (ret) {
1159	kfree(objp: sdata);
1160	return ret;
1161	}
1162
1163	mutex_lock(&local->iflist_mtx);
1164	rcu_assign_pointer(local->monitor_sdata, sdata);
1165	mutex_unlock(lock: &local->iflist_mtx);
1166
1167	ret = ieee80211_link_use_channel(link: &sdata->deflink, req: &local->monitor_chanreq,
1168	mode: IEEE80211_CHANCTX_EXCLUSIVE);
1169	if (ret) {
1170	mutex_lock(&local->iflist_mtx);
1171	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1172	mutex_unlock(lock: &local->iflist_mtx);
1173	synchronize_net();
1174	drv_remove_interface(local, sdata);
1175	kfree(objp: sdata);
1176	return ret;
1177	}
1178
1179	skb_queue_head_init(list: &sdata->skb_queue);
1180	skb_queue_head_init(list: &sdata->status_queue);
1181	wiphy_work_init(work: &sdata->work, func: ieee80211_iface_work);
1182
1183	return 0;
1184	}
1185
1186	void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1187	{
1188	struct ieee80211_sub_if_data *sdata;
1189
1190	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1191	return;
1192
1193	ASSERT_RTNL();
1194	lockdep_assert_wiphy(local->hw.wiphy);
1195
1196	mutex_lock(&local->iflist_mtx);
1197
1198	sdata = rcu_dereference_protected(local->monitor_sdata,
1199	lockdep_is_held(&local->iflist_mtx));
1200	if (!sdata) {
1201	mutex_unlock(lock: &local->iflist_mtx);
1202	return;
1203	}
1204
1205	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1206	mutex_unlock(lock: &local->iflist_mtx);
1207
1208	synchronize_net();
1209
1210	ieee80211_link_release_channel(link: &sdata->deflink);
1211
1212	drv_remove_interface(local, sdata);
1213
1214	kfree(objp: sdata);
1215	}
1216
1217	/*
1218	* NOTE: Be very careful when changing this function, it must NOT return
1219	* an error on interface type changes that have been pre-checked, so most
1220	* checks should be in ieee80211_check_concurrent_iface.
1221	*/
1222	int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1223	{
1224	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1225	struct net_device *dev = wdev->netdev;
1226	struct ieee80211_local *local = sdata->local;
1227	u64 changed = 0;
1228	int res;
1229	u32 hw_reconf_flags = 0;
1230
1231	lockdep_assert_wiphy(local->hw.wiphy);
1232
1233	switch (sdata->vif.type) {
1234	case NL80211_IFTYPE_AP_VLAN: {
1235	struct ieee80211_sub_if_data *master;
1236
1237	if (!sdata->bss)
1238	return -ENOLINK;
1239
1240	list_add(new: &sdata->u.vlan.list, head: &sdata->bss->vlans);
1241
1242	master = container_of(sdata->bss,
1243	struct ieee80211_sub_if_data, u.ap);
1244	sdata->control_port_protocol =
1245	master->control_port_protocol;
1246	sdata->control_port_no_encrypt =
1247	master->control_port_no_encrypt;
1248	sdata->control_port_over_nl80211 =
1249	master->control_port_over_nl80211;
1250	sdata->control_port_no_preauth =
1251	master->control_port_no_preauth;
1252	sdata->vif.cab_queue = master->vif.cab_queue;
1253	memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1254	sizeof(sdata->vif.hw_queue));
1255	sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq;
1256
1257	sdata->crypto_tx_tailroom_needed_cnt +=
1258	master->crypto_tx_tailroom_needed_cnt;
1259
1260	break;
1261	}
1262	case NL80211_IFTYPE_AP:
1263	sdata->bss = &sdata->u.ap;
1264	break;
1265	case NL80211_IFTYPE_MESH_POINT:
1266	case NL80211_IFTYPE_STATION:
1267	case NL80211_IFTYPE_MONITOR:
1268	case NL80211_IFTYPE_ADHOC:
1269	case NL80211_IFTYPE_P2P_DEVICE:
1270	case NL80211_IFTYPE_OCB:
1271	case NL80211_IFTYPE_NAN:
1272	/* no special treatment */
1273	break;
1274	case NL80211_IFTYPE_UNSPECIFIED:
1275	case NUM_NL80211_IFTYPES:
1276	case NL80211_IFTYPE_P2P_CLIENT:
1277	case NL80211_IFTYPE_P2P_GO:
1278	case NL80211_IFTYPE_WDS:
1279	/* cannot happen */
1280	WARN_ON(1);
1281	break;
1282	}
1283
1284	if (local->open_count == 0) {
1285	/* here we can consider everything in good order (again) */
1286	local->reconfig_failure = false;
1287
1288	res = drv_start(local);
1289	if (res)
1290	goto err_del_bss;
1291	ieee80211_led_radio(local, enabled: true);
1292	ieee80211_mod_tpt_led_trig(local,
1293	types_on: IEEE80211_TPT_LEDTRIG_FL_RADIO, types_off: 0);
1294	}
1295
1296	/*
1297	* Copy the hopefully now-present MAC address to
1298	* this interface, if it has the special null one.
1299	*/
1300	if (dev && is_zero_ether_addr(addr: dev->dev_addr)) {
1301	eth_hw_addr_set(dev, addr: local->hw.wiphy->perm_addr);
1302	memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1303
1304	if (!is_valid_ether_addr(addr: dev->dev_addr)) {
1305	res = -EADDRNOTAVAIL;
1306	goto err_stop;
1307	}
1308	}
1309
1310	switch (sdata->vif.type) {
1311	case NL80211_IFTYPE_AP_VLAN:
1312	/* no need to tell driver, but set carrier and chanctx */
1313	if (sdata->bss->active) {
1314	ieee80211_link_vlan_copy_chanctx(link: &sdata->deflink);
1315	netif_carrier_on(dev);
1316	ieee80211_set_vif_encap_ops(sdata);
1317	} else {
1318	netif_carrier_off(dev);
1319	}
1320	break;
1321	case NL80211_IFTYPE_MONITOR:
1322	if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1323	local->cooked_mntrs++;
1324	break;
1325	}
1326
1327	if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1328	res = drv_add_interface(local, sdata);
1329	if (res)
1330	goto err_stop;
1331	} else if (local->monitors == 0 && local->open_count == 0) {
1332	res = ieee80211_add_virtual_monitor(local);
1333	if (res)
1334	goto err_stop;
1335	}
1336
1337	/* must be before the call to ieee80211_configure_filter */
1338	local->monitors++;
1339	if (local->monitors == 1) {
1340	local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1341	hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1342	}
1343
1344	ieee80211_adjust_monitor_flags(sdata, offset: 1);
1345	ieee80211_configure_filter(local);
1346	ieee80211_recalc_offload(local);
1347	ieee80211_recalc_idle(local);
1348
1349	netif_carrier_on(dev);
1350	break;
1351	default:
1352	if (coming_up) {
1353	ieee80211_del_virtual_monitor(local);
1354	ieee80211_set_sdata_offload_flags(sdata);
1355
1356	res = drv_add_interface(local, sdata);
1357	if (res)
1358	goto err_stop;
1359
1360	ieee80211_set_vif_encap_ops(sdata);
1361	res = ieee80211_check_queues(sdata,
1362	iftype: ieee80211_vif_type_p2p(vif: &sdata->vif));
1363	if (res)
1364	goto err_del_interface;
1365	}
1366
1367	if (sdata->vif.type == NL80211_IFTYPE_AP) {
1368	local->fif_pspoll++;
1369	local->fif_probe_req++;
1370
1371	ieee80211_configure_filter(local);
1372	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1373	local->fif_probe_req++;
1374	}
1375
1376	if (sdata->vif.probe_req_reg)
1377	drv_config_iface_filter(local, sdata,
1378	filter_flags: FIF_PROBE_REQ,
1379	changed_flags: FIF_PROBE_REQ);
1380
1381	if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1382	sdata->vif.type != NL80211_IFTYPE_NAN)
1383	changed |= ieee80211_reset_erp_info(sdata);
1384	ieee80211_link_info_change_notify(sdata, link: &sdata->deflink,
1385	changed);
1386
1387	switch (sdata->vif.type) {
1388	case NL80211_IFTYPE_STATION:
1389	case NL80211_IFTYPE_ADHOC:
1390	case NL80211_IFTYPE_AP:
1391	case NL80211_IFTYPE_MESH_POINT:
1392	case NL80211_IFTYPE_OCB:
1393	netif_carrier_off(dev);
1394	break;
1395	case NL80211_IFTYPE_P2P_DEVICE:
1396	case NL80211_IFTYPE_NAN:
1397	break;
1398	default:
1399	/* not reached */
1400	WARN_ON(1);
1401	}
1402
1403	/*
1404	* Set default queue parameters so drivers don't
1405	* need to initialise the hardware if the hardware
1406	* doesn't start up with sane defaults.
1407	* Enable QoS for anything but station interfaces.
1408	*/
1409	ieee80211_set_wmm_default(link: &sdata->deflink, bss_notify: true,
1410	enable_qos: sdata->vif.type != NL80211_IFTYPE_STATION);
1411	}
1412
1413	switch (sdata->vif.type) {
1414	case NL80211_IFTYPE_P2P_DEVICE:
1415	rcu_assign_pointer(local->p2p_sdata, sdata);
1416	break;
1417	case NL80211_IFTYPE_MONITOR:
1418	if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1419	break;
1420	list_add_tail_rcu(new: &sdata->u.mntr.list, head: &local->mon_list);
1421	break;
1422	default:
1423	break;
1424	}
1425
1426	/*
1427	* set_multicast_list will be invoked by the networking core
1428	* which will check whether any increments here were done in
1429	* error and sync them down to the hardware as filter flags.
1430	*/
1431	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1432	atomic_inc(v: &local->iff_allmultis);
1433
1434	if (coming_up)
1435	local->open_count++;
1436
1437	if (local->open_count == 1)
1438	ieee80211_hw_conf_init(local);
1439	else if (hw_reconf_flags)
1440	ieee80211_hw_config(local, changed: hw_reconf_flags);
1441
1442	ieee80211_recalc_ps(local);
1443
1444	set_bit(nr: SDATA_STATE_RUNNING, addr: &sdata->state);
1445
1446	return 0;
1447	err_del_interface:
1448	drv_remove_interface(local, sdata);
1449	err_stop:
1450	if (!local->open_count)
1451	drv_stop(local);
1452	err_del_bss:
1453	sdata->bss = NULL;
1454	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1455	list_del(entry: &sdata->u.vlan.list);
1456	/* might already be clear but that doesn't matter */
1457	clear_bit(nr: SDATA_STATE_RUNNING, addr: &sdata->state);
1458	return res;
1459	}
1460
1461	static void ieee80211_if_free(struct net_device *dev)
1462	{
1463	free_percpu(pdata: dev->tstats);
1464	}
1465
1466	static void ieee80211_if_setup(struct net_device *dev)
1467	{
1468	ether_setup(dev);
1469	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1470	dev->priv_flags |= IFF_NO_QUEUE;
1471	dev->netdev_ops = &ieee80211_dataif_ops;
1472	dev->needs_free_netdev = true;
1473	dev->priv_destructor = ieee80211_if_free;
1474	}
1475
1476	static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1477	struct ieee80211_sub_if_data *sdata,
1478	struct sk_buff *skb)
1479	{
1480	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1481
1482	lockdep_assert_wiphy(local->hw.wiphy);
1483
1484	if (ieee80211_is_action(fc: mgmt->frame_control) &&
1485	mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1486	struct sta_info *sta;
1487	int len = skb->len;
1488
1489	sta = sta_info_get_bss(sdata, addr: mgmt->sa);
1490	if (sta) {
1491	switch (mgmt->u.action.u.addba_req.action_code) {
1492	case WLAN_ACTION_ADDBA_REQ:
1493	ieee80211_process_addba_request(local, sta,
1494	mgmt, len);
1495	break;
1496	case WLAN_ACTION_ADDBA_RESP:
1497	ieee80211_process_addba_resp(local, sta,
1498	mgmt, len);
1499	break;
1500	case WLAN_ACTION_DELBA:
1501	ieee80211_process_delba(sdata, sta,
1502	mgmt, len);
1503	break;
1504	default:
1505	WARN_ON(1);
1506	break;
1507	}
1508	}
1509	} else if (ieee80211_is_action(fc: mgmt->frame_control) &&
1510	mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1511	switch (mgmt->u.action.u.vht_group_notif.action_code) {
1512	case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1513	struct ieee80211_rx_status *status;
1514	enum nl80211_band band;
1515	struct sta_info *sta;
1516	u8 opmode;
1517
1518	status = IEEE80211_SKB_RXCB(skb);
1519	band = status->band;
1520	opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1521
1522	sta = sta_info_get_bss(sdata, addr: mgmt->sa);
1523
1524	if (sta)
1525	ieee80211_vht_handle_opmode(sdata,
1526	sta: &sta->deflink,
1527	opmode, band);
1528
1529	break;
1530	}
1531	case WLAN_VHT_ACTION_GROUPID_MGMT:
1532	ieee80211_process_mu_groups(sdata, link: &sdata->deflink,
1533	mgmt);
1534	break;
1535	default:
1536	WARN_ON(1);
1537	break;
1538	}
1539	} else if (ieee80211_is_action(fc: mgmt->frame_control) &&
1540	mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1541	switch (mgmt->u.action.u.s1g.action_code) {
1542	case WLAN_S1G_TWT_TEARDOWN:
1543	case WLAN_S1G_TWT_SETUP:
1544	ieee80211_s1g_rx_twt_action(sdata, skb);
1545	break;
1546	default:
1547	break;
1548	}
1549	} else if (ieee80211_is_action(fc: mgmt->frame_control) &&
1550	mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
1551	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1552	switch (mgmt->u.action.u.ttlm_req.action_code) {
1553	case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
1554	ieee80211_process_neg_ttlm_req(sdata, mgmt,
1555	len: skb->len);
1556	break;
1557	case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
1558	ieee80211_process_neg_ttlm_res(sdata, mgmt,
1559	len: skb->len);
1560	break;
1561	default:
1562	break;
1563	}
1564	}
1565	} else if (ieee80211_is_ext(fc: mgmt->frame_control)) {
1566	if (sdata->vif.type == NL80211_IFTYPE_STATION)
1567	ieee80211_sta_rx_queued_ext(sdata, skb);
1568	else
1569	WARN_ON(1);
1570	} else if (ieee80211_is_data_qos(fc: mgmt->frame_control)) {
1571	struct ieee80211_hdr *hdr = (void *)mgmt;
1572	struct sta_info *sta;
1573
1574	/*
1575	* So the frame isn't mgmt, but frame_control
1576	* is at the right place anyway, of course, so
1577	* the if statement is correct.
1578	*
1579	* Warn if we have other data frame types here,
1580	* they must not get here.
1581	*/
1582	WARN_ON(hdr->frame_control &
1583	cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1584	WARN_ON(!(hdr->seq_ctrl &
1585	cpu_to_le16(IEEE80211_SCTL_FRAG)));
1586	/*
1587	* This was a fragment of a frame, received while
1588	* a block-ack session was active. That cannot be
1589	* right, so terminate the session.
1590	*/
1591	sta = sta_info_get_bss(sdata, addr: mgmt->sa);
1592	if (sta) {
1593	u16 tid = ieee80211_get_tid(hdr);
1594
1595	__ieee80211_stop_rx_ba_session(
1596	sta, tid, initiator: WLAN_BACK_RECIPIENT,
1597	reason: WLAN_REASON_QSTA_REQUIRE_SETUP,
1598	stop: true);
1599	}
1600	} else switch (sdata->vif.type) {
1601	case NL80211_IFTYPE_STATION:
1602	ieee80211_sta_rx_queued_mgmt(sdata, skb);
1603	break;
1604	case NL80211_IFTYPE_ADHOC:
1605	ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1606	break;
1607	case NL80211_IFTYPE_MESH_POINT:
1608	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
1609	break;
1610	ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1611	break;
1612	default:
1613	WARN(1, "frame for unexpected interface type");
1614	break;
1615	}
1616	}
1617
1618	static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1619	struct sk_buff *skb)
1620	{
1621	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1622
1623	if (ieee80211_is_action(fc: mgmt->frame_control) &&
1624	mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1625	switch (mgmt->u.action.u.s1g.action_code) {
1626	case WLAN_S1G_TWT_TEARDOWN:
1627	case WLAN_S1G_TWT_SETUP:
1628	ieee80211_s1g_status_twt_action(sdata, skb);
1629	break;
1630	default:
1631	break;
1632	}
1633	}
1634	}
1635
1636	static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1637	{
1638	struct ieee80211_sub_if_data *sdata =
1639	container_of(work, struct ieee80211_sub_if_data, work);
1640	struct ieee80211_local *local = sdata->local;
1641	struct sk_buff *skb;
1642
1643	if (!ieee80211_sdata_running(sdata))
1644	return;
1645
1646	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1647	return;
1648
1649	if (!ieee80211_can_run_worker(local))
1650	return;
1651
1652	/* first process frames */
1653	while ((skb = skb_dequeue(list: &sdata->skb_queue))) {
1654	kcov_remote_start_common(id: skb_get_kcov_handle(skb));
1655
1656	if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1657	ieee80211_process_tdls_channel_switch(sdata, skb);
1658	else
1659	ieee80211_iface_process_skb(local, sdata, skb);
1660
1661	kfree_skb(skb);
1662	kcov_remote_stop();
1663	}
1664
1665	/* process status queue */
1666	while ((skb = skb_dequeue(list: &sdata->status_queue))) {
1667	kcov_remote_start_common(id: skb_get_kcov_handle(skb));
1668
1669	ieee80211_iface_process_status(sdata, skb);
1670	kfree_skb(skb);
1671
1672	kcov_remote_stop();
1673	}
1674
1675	/* then other type-dependent work */
1676	switch (sdata->vif.type) {
1677	case NL80211_IFTYPE_STATION:
1678	ieee80211_sta_work(sdata);
1679	break;
1680	case NL80211_IFTYPE_ADHOC:
1681	ieee80211_ibss_work(sdata);
1682	break;
1683	case NL80211_IFTYPE_MESH_POINT:
1684	if (!ieee80211_vif_is_mesh(vif: &sdata->vif))
1685	break;
1686	ieee80211_mesh_work(sdata);
1687	break;
1688	case NL80211_IFTYPE_OCB:
1689	ieee80211_ocb_work(sdata);
1690	break;
1691	default:
1692	break;
1693	}
1694	}
1695
1696	static void ieee80211_activate_links_work(struct wiphy *wiphy,
1697	struct wiphy_work *work)
1698	{
1699	struct ieee80211_sub_if_data *sdata =
1700	container_of(work, struct ieee80211_sub_if_data,
1701	activate_links_work);
1702
1703	ieee80211_set_active_links(vif: &sdata->vif, active_links: sdata->desired_active_links);
1704	}
1705
1706	/*
1707	* Helper function to initialise an interface to a specific type.
1708	*/
1709	static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1710	enum nl80211_iftype type)
1711	{
1712	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1713	0xff, 0xff, 0xff};
1714
1715	/* clear type-dependent unions */
1716	memset(&sdata->u, 0, sizeof(sdata->u));
1717	memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1718
1719	/* and set some type-dependent values */
1720	sdata->vif.type = type;
1721	sdata->vif.p2p = false;
1722	sdata->wdev.iftype = type;
1723
1724	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1725	sdata->control_port_no_encrypt = false;
1726	sdata->control_port_over_nl80211 = false;
1727	sdata->control_port_no_preauth = false;
1728	sdata->vif.cfg.idle = true;
1729	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1730
1731	sdata->noack_map = 0;
1732
1733	/* only monitor/p2p-device differ */
1734	if (sdata->dev) {
1735	sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1736	sdata->dev->type = ARPHRD_ETHER;
1737	}
1738
1739	skb_queue_head_init(list: &sdata->skb_queue);
1740	skb_queue_head_init(list: &sdata->status_queue);
1741	wiphy_work_init(work: &sdata->work, func: ieee80211_iface_work);
1742	wiphy_work_init(work: &sdata->activate_links_work,
1743	func: ieee80211_activate_links_work);
1744
1745	switch (type) {
1746	case NL80211_IFTYPE_P2P_GO:
1747	type = NL80211_IFTYPE_AP;
1748	sdata->vif.type = type;
1749	sdata->vif.p2p = true;
1750	fallthrough;
1751	case NL80211_IFTYPE_AP:
1752	skb_queue_head_init(list: &sdata->u.ap.ps.bc_buf);
1753	INIT_LIST_HEAD(list: &sdata->u.ap.vlans);
1754	sdata->vif.bss_conf.bssid = sdata->vif.addr;
1755	break;
1756	case NL80211_IFTYPE_P2P_CLIENT:
1757	type = NL80211_IFTYPE_STATION;
1758	sdata->vif.type = type;
1759	sdata->vif.p2p = true;
1760	fallthrough;
1761	case NL80211_IFTYPE_STATION:
1762	sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1763	ieee80211_sta_setup_sdata(sdata);
1764	break;
1765	case NL80211_IFTYPE_OCB:
1766	sdata->vif.bss_conf.bssid = bssid_wildcard;
1767	ieee80211_ocb_setup_sdata(sdata);
1768	break;
1769	case NL80211_IFTYPE_ADHOC:
1770	sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1771	ieee80211_ibss_setup_sdata(sdata);
1772	break;
1773	case NL80211_IFTYPE_MESH_POINT:
1774	if (ieee80211_vif_is_mesh(vif: &sdata->vif))
1775	ieee80211_mesh_init_sdata(sdata);
1776	break;
1777	case NL80211_IFTYPE_MONITOR:
1778	sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1779	sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1780	sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1781	MONITOR_FLAG_OTHER_BSS;
1782	break;
1783	case NL80211_IFTYPE_NAN:
1784	idr_init(idr: &sdata->u.nan.function_inst_ids);
1785	spin_lock_init(&sdata->u.nan.func_lock);
1786	sdata->vif.bss_conf.bssid = sdata->vif.addr;
1787	break;
1788	case NL80211_IFTYPE_AP_VLAN:
1789	case NL80211_IFTYPE_P2P_DEVICE:
1790	sdata->vif.bss_conf.bssid = sdata->vif.addr;
1791	break;
1792	case NL80211_IFTYPE_UNSPECIFIED:
1793	case NL80211_IFTYPE_WDS:
1794	case NUM_NL80211_IFTYPES:
1795	WARN_ON(1);
1796	break;
1797	}
1798
1799	/* need to do this after the switch so vif.type is correct */
1800	ieee80211_link_setup(link: &sdata->deflink);
1801
1802	ieee80211_debugfs_recreate_netdev(sdata, mld_vif: false);
1803	}
1804
1805	static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1806	enum nl80211_iftype type)
1807	{
1808	struct ieee80211_local *local = sdata->local;
1809	int ret, err;
1810	enum nl80211_iftype internal_type = type;
1811	bool p2p = false;
1812
1813	ASSERT_RTNL();
1814
1815	if (!local->ops->change_interface)
1816	return -EBUSY;
1817
1818	/* for now, don't support changing while links exist */
1819	if (ieee80211_vif_is_mld(vif: &sdata->vif))
1820	return -EBUSY;
1821
1822	switch (sdata->vif.type) {
1823	case NL80211_IFTYPE_AP:
1824	if (!list_empty(head: &sdata->u.ap.vlans))
1825	return -EBUSY;
1826	break;
1827	case NL80211_IFTYPE_STATION:
1828	case NL80211_IFTYPE_ADHOC:
1829	case NL80211_IFTYPE_OCB:
1830	/*
1831	* Could maybe also all others here?
1832	* Just not sure how that interacts
1833	* with the RX/config path e.g. for
1834	* mesh.
1835	*/
1836	break;
1837	default:
1838	return -EBUSY;
1839	}
1840
1841	switch (type) {
1842	case NL80211_IFTYPE_AP:
1843	case NL80211_IFTYPE_STATION:
1844	case NL80211_IFTYPE_ADHOC:
1845	case NL80211_IFTYPE_OCB:
1846	/*
1847	* Could probably support everything
1848	* but here.
1849	*/
1850	break;
1851	case NL80211_IFTYPE_P2P_CLIENT:
1852	p2p = true;
1853	internal_type = NL80211_IFTYPE_STATION;
1854	break;
1855	case NL80211_IFTYPE_P2P_GO:
1856	p2p = true;
1857	internal_type = NL80211_IFTYPE_AP;
1858	break;
1859	default:
1860	return -EBUSY;
1861	}
1862
1863	ret = ieee80211_check_concurrent_iface(sdata, iftype: internal_type);
1864	if (ret)
1865	return ret;
1866
1867	ieee80211_stop_vif_queues(local, sdata,
1868	reason: IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1869	/* do_stop will synchronize_rcu() first thing */
1870	ieee80211_do_stop(sdata, going_down: false);
1871
1872	ieee80211_teardown_sdata(sdata);
1873
1874	ieee80211_set_sdata_offload_flags(sdata);
1875	ret = drv_change_interface(local, sdata, type: internal_type, p2p);
1876	if (ret)
1877	type = ieee80211_vif_type_p2p(vif: &sdata->vif);
1878
1879	/*
1880	* Ignore return value here, there's not much we can do since
1881	* the driver changed the interface type internally already.
1882	* The warnings will hopefully make driver authors fix it :-)
1883	*/
1884	ieee80211_check_queues(sdata, iftype: type);
1885
1886	ieee80211_setup_sdata(sdata, type);
1887	ieee80211_set_vif_encap_ops(sdata);
1888
1889	err = ieee80211_do_open(wdev: &sdata->wdev, coming_up: false);
1890	WARN(err, "type change: do_open returned %d", err);
1891
1892	ieee80211_wake_vif_queues(local, sdata,
1893	reason: IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1894	return ret;
1895	}
1896
1897	int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1898	enum nl80211_iftype type)
1899	{
1900	int ret;
1901
1902	ASSERT_RTNL();
1903
1904	if (type == ieee80211_vif_type_p2p(vif: &sdata->vif))
1905	return 0;
1906
1907	if (ieee80211_sdata_running(sdata)) {
1908	ret = ieee80211_runtime_change_iftype(sdata, type);
1909	if (ret)
1910	return ret;
1911	} else {
1912	/* Purge and reset type-dependent state. */
1913	ieee80211_teardown_sdata(sdata);
1914	ieee80211_setup_sdata(sdata, type);
1915	}
1916
1917	/* reset some values that shouldn't be kept across type changes */
1918	if (type == NL80211_IFTYPE_STATION)
1919	sdata->u.mgd.use_4addr = false;
1920
1921	return 0;
1922	}
1923
1924	static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1925	u8 *perm_addr, enum nl80211_iftype type)
1926	{
1927	struct ieee80211_sub_if_data *sdata;
1928	u64 mask, start, addr, val, inc;
1929	u8 *m;
1930	u8 tmp_addr[ETH_ALEN];
1931	int i;
1932
1933	lockdep_assert_wiphy(local->hw.wiphy);
1934
1935	/* default ... something at least */
1936	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1937
1938	if (is_zero_ether_addr(addr: local->hw.wiphy->addr_mask) &&
1939	local->hw.wiphy->n_addresses <= 1)
1940	return;
1941
1942	switch (type) {
1943	case NL80211_IFTYPE_MONITOR:
1944	/* doesn't matter */
1945	break;
1946	case NL80211_IFTYPE_AP_VLAN:
1947	/* match up with an AP interface */
1948	list_for_each_entry(sdata, &local->interfaces, list) {
1949	if (sdata->vif.type != NL80211_IFTYPE_AP)
1950	continue;
1951	memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1952	break;
1953	}
1954	/* keep default if no AP interface present */
1955	break;
1956	case NL80211_IFTYPE_P2P_CLIENT:
1957	case NL80211_IFTYPE_P2P_GO:
1958	if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1959	list_for_each_entry(sdata, &local->interfaces, list) {
1960	if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1961	continue;
1962	if (!ieee80211_sdata_running(sdata))
1963	continue;
1964	memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1965	return;
1966	}
1967	}
1968	fallthrough;
1969	default:
1970	/* assign a new address if possible -- try n_addresses first */
1971	for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1972	bool used = false;
1973
1974	list_for_each_entry(sdata, &local->interfaces, list) {
1975	if (ether_addr_equal(addr1: local->hw.wiphy->addresses[i].addr,
1976	addr2: sdata->vif.addr)) {
1977	used = true;
1978	break;
1979	}
1980	}
1981
1982	if (!used) {
1983	memcpy(perm_addr,
1984	local->hw.wiphy->addresses[i].addr,
1985	ETH_ALEN);
1986	break;
1987	}
1988	}
1989
1990	/* try mask if available */
1991	if (is_zero_ether_addr(addr: local->hw.wiphy->addr_mask))
1992	break;
1993
1994	m = local->hw.wiphy->addr_mask;
1995	mask = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1996	((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1997	((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1998
1999	if (__ffs64(word: mask) + hweight64(mask) != fls64(x: mask)) {
2000	/* not a contiguous mask ... not handled now! */
2001	pr_info("not contiguous\n");
2002	break;
2003	}
2004
2005	/*
2006	* Pick address of existing interface in case user changed
2007	* MAC address manually, default to perm_addr.
2008	*/
2009	m = local->hw.wiphy->perm_addr;
2010	list_for_each_entry(sdata, &local->interfaces, list) {
2011	if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2012	continue;
2013	m = sdata->vif.addr;
2014	break;
2015	}
2016	start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2017	((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2018	((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2019
2020	inc = 1ULL<<__ffs64(word: mask);
2021	val = (start & mask);
2022	addr = (start & ~mask) | (val & mask);
2023	do {
2024	bool used = false;
2025
2026	tmp_addr[5] = addr >> 0*8;
2027	tmp_addr[4] = addr >> 1*8;
2028	tmp_addr[3] = addr >> 2*8;
2029	tmp_addr[2] = addr >> 3*8;
2030	tmp_addr[1] = addr >> 4*8;
2031	tmp_addr[0] = addr >> 5*8;
2032
2033	val += inc;
2034
2035	list_for_each_entry(sdata, &local->interfaces, list) {
2036	if (ether_addr_equal(addr1: tmp_addr, addr2: sdata->vif.addr)) {
2037	used = true;
2038	break;
2039	}
2040	}
2041
2042	if (!used) {
2043	memcpy(perm_addr, tmp_addr, ETH_ALEN);
2044	break;
2045	}
2046	addr = (start & ~mask) | (val & mask);
2047	} while (addr != start);
2048
2049	break;
2050	}
2051	}
2052
2053	int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2054	unsigned char name_assign_type,
2055	struct wireless_dev **new_wdev, enum nl80211_iftype type,
2056	struct vif_params *params)
2057	{
2058	struct net_device *ndev = NULL;
2059	struct ieee80211_sub_if_data *sdata = NULL;
2060	struct txq_info *txqi;
2061	int ret, i;
2062
2063	ASSERT_RTNL();
2064	lockdep_assert_wiphy(local->hw.wiphy);
2065
2066	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2067	struct wireless_dev *wdev;
2068
2069	sdata = kzalloc(size: sizeof(*sdata) + local->hw.vif_data_size,
2070	GFP_KERNEL);
2071	if (!sdata)
2072	return -ENOMEM;
2073	wdev = &sdata->wdev;
2074
2075	sdata->dev = NULL;
2076	strscpy(sdata->name, name, IFNAMSIZ);
2077	ieee80211_assign_perm_addr(local, perm_addr: wdev->address, type);
2078	memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2079	ether_addr_copy(dst: sdata->vif.bss_conf.addr, src: sdata->vif.addr);
2080	} else {
2081	int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2082	sizeof(void *));
2083	int txq_size = 0;
2084
2085	if (type != NL80211_IFTYPE_AP_VLAN &&
2086	(type != NL80211_IFTYPE_MONITOR ||
2087	(params->flags & MONITOR_FLAG_ACTIVE)))
2088	txq_size += sizeof(struct txq_info) +
2089	local->hw.txq_data_size;
2090
2091	ndev = alloc_netdev_mqs(sizeof_priv: size + txq_size,
2092	name, name_assign_type,
2093	setup: ieee80211_if_setup, txqs: 1, rxqs: 1);
2094	if (!ndev)
2095	return -ENOMEM;
2096
2097	dev_net_set(dev: ndev, net: wiphy_net(wiphy: local->hw.wiphy));
2098
2099	ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2100	if (!ndev->tstats) {
2101	free_netdev(dev: ndev);
2102	return -ENOMEM;
2103	}
2104
2105	ndev->needed_headroom = local->tx_headroom +
2106	4*6 /* four MAC addresses */
2107	+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2108	+ 6 /* mesh */
2109	+ 8 /* rfc1042/bridge tunnel */
2110	- ETH_HLEN /* ethernet hard_header_len */
2111	+ IEEE80211_ENCRYPT_HEADROOM;
2112	ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2113
2114	ret = dev_alloc_name(dev: ndev, name: ndev->name);
2115	if (ret < 0) {
2116	ieee80211_if_free(dev: ndev);
2117	free_netdev(dev: ndev);
2118	return ret;
2119	}
2120
2121	ieee80211_assign_perm_addr(local, perm_addr: ndev->perm_addr, type);
2122	if (is_valid_ether_addr(addr: params->macaddr))
2123	eth_hw_addr_set(dev: ndev, addr: params->macaddr);
2124	else
2125	eth_hw_addr_set(dev: ndev, addr: ndev->perm_addr);
2126	SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2127
2128	/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2129	sdata = netdev_priv(dev: ndev);
2130	ndev->ieee80211_ptr = &sdata->wdev;
2131	memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2132	ether_addr_copy(dst: sdata->vif.bss_conf.addr, src: sdata->vif.addr);
2133	memcpy(sdata->name, ndev->name, IFNAMSIZ);
2134
2135	if (txq_size) {
2136	txqi = netdev_priv(dev: ndev) + size;
2137	ieee80211_txq_init(sdata, NULL, txq: txqi, tid: 0);
2138	}
2139
2140	sdata->dev = ndev;
2141	}
2142
2143	/* initialise type-independent data */
2144	sdata->wdev.wiphy = local->hw.wiphy;
2145
2146	ieee80211_sdata_init(local, sdata);
2147
2148	ieee80211_init_frag_cache(cache: &sdata->frags);
2149
2150	INIT_LIST_HEAD(list: &sdata->key_list);
2151
2152	wiphy_delayed_work_init(dwork: &sdata->dec_tailroom_needed_wk,
2153	func: ieee80211_delayed_tailroom_dec);
2154
2155	for (i = 0; i < NUM_NL80211_BANDS; i++) {
2156	struct ieee80211_supported_band *sband;
2157	sband = local->hw.wiphy->bands[i];
2158	sdata->rc_rateidx_mask[i] =
2159	sband ? (1 << sband->n_bitrates) - 1 : 0;
2160	if (sband) {
2161	__le16 cap;
2162	u16 *vht_rate_mask;
2163
2164	memcpy(sdata->rc_rateidx_mcs_mask[i],
2165	sband->ht_cap.mcs.rx_mask,
2166	sizeof(sdata->rc_rateidx_mcs_mask[i]));
2167
2168	cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2169	vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2170	ieee80211_get_vht_mask_from_cap(vht_cap: cap, vht_mask: vht_rate_mask);
2171	} else {
2172	memset(sdata->rc_rateidx_mcs_mask[i], 0,
2173	sizeof(sdata->rc_rateidx_mcs_mask[i]));
2174	memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2175	sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2176	}
2177	}
2178
2179	ieee80211_set_default_queues(sdata);
2180
2181	sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2182	sdata->deflink.user_power_level = local->user_power_level;
2183
2184	/* setup type-dependent data */
2185	ieee80211_setup_sdata(sdata, type);
2186
2187	if (ndev) {
2188	ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2189	if (type == NL80211_IFTYPE_STATION)
2190	sdata->u.mgd.use_4addr = params->use_4addr;
2191
2192	ndev->features |= local->hw.netdev_features;
2193	ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2194	ndev->hw_features |= ndev->features &
2195	MAC80211_SUPPORTED_FEATURES_TX;
2196	sdata->vif.netdev_features = local->hw.netdev_features;
2197
2198	netdev_set_default_ethtool_ops(dev: ndev, ops: &ieee80211_ethtool_ops);
2199
2200	/* MTU range is normally 256 - 2304, where the upper limit is
2201	* the maximum MSDU size. Monitor interfaces send and receive
2202	* MPDU and A-MSDU frames which may be much larger so we do
2203	* not impose an upper limit in that case.
2204	*/
2205	ndev->min_mtu = 256;
2206	if (type == NL80211_IFTYPE_MONITOR)
2207	ndev->max_mtu = 0;
2208	else
2209	ndev->max_mtu = local->hw.max_mtu;
2210
2211	ret = cfg80211_register_netdevice(dev: ndev);
2212	if (ret) {
2213	free_netdev(dev: ndev);
2214	return ret;
2215	}
2216	}
2217
2218	mutex_lock(&local->iflist_mtx);
2219	list_add_tail_rcu(new: &sdata->list, head: &local->interfaces);
2220	mutex_unlock(lock: &local->iflist_mtx);
2221
2222	if (new_wdev)
2223	*new_wdev = &sdata->wdev;
2224
2225	return 0;
2226	}
2227
2228	void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2229	{
2230	ASSERT_RTNL();
2231	lockdep_assert_wiphy(sdata->local->hw.wiphy);
2232
2233	mutex_lock(&sdata->local->iflist_mtx);
2234	list_del_rcu(entry: &sdata->list);
2235	mutex_unlock(lock: &sdata->local->iflist_mtx);
2236
2237	if (sdata->vif.txq)
2238	ieee80211_txq_purge(local: sdata->local, txqi: to_txq_info(txq: sdata->vif.txq));
2239
2240	synchronize_rcu();
2241
2242	cfg80211_unregister_wdev(wdev: &sdata->wdev);
2243
2244	if (!sdata->dev) {
2245	ieee80211_teardown_sdata(sdata);
2246	kfree(objp: sdata);
2247	}
2248	}
2249
2250	void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2251	{
2252	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2253	return;
2254	ieee80211_do_stop(sdata, going_down: true);
2255	}
2256
2257	void ieee80211_remove_interfaces(struct ieee80211_local *local)
2258	{
2259	struct ieee80211_sub_if_data *sdata, *tmp;
2260	LIST_HEAD(unreg_list);
2261
2262	ASSERT_RTNL();
2263
2264	/* Before destroying the interfaces, make sure they're all stopped so
2265	* that the hardware is stopped. Otherwise, the driver might still be
2266	* iterating the interfaces during the shutdown, e.g. from a worker
2267	* or from RX processing or similar, and if it does so (using atomic
2268	* iteration) while we're manipulating the list, the iteration will
2269	* crash.
2270	*
2271	* After this, the hardware should be stopped and the driver should
2272	* have stopped all of its activities, so that we can do RCU-unaware
2273	* manipulations of the interface list below.
2274	*/
2275	cfg80211_shutdown_all_interfaces(wiphy: local->hw.wiphy);
2276
2277	wiphy_lock(wiphy: local->hw.wiphy);
2278
2279	WARN(local->open_count, "%s: open count remains %d\n",
2280	wiphy_name(local->hw.wiphy), local->open_count);
2281
2282	mutex_lock(&local->iflist_mtx);
2283	list_splice_init(list: &local->interfaces, head: &unreg_list);
2284	mutex_unlock(lock: &local->iflist_mtx);
2285
2286	list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2287	bool netdev = sdata->dev;
2288
2289	/*
2290	* Remove IP addresses explicitly, since the notifier will
2291	* skip the callbacks if wdev->registered is false, since
2292	* we can't acquire the wiphy_lock() again there if already
2293	* inside this locked section.
2294	*/
2295	sdata->vif.cfg.arp_addr_cnt = 0;
2296	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2297	sdata->u.mgd.associated)
2298	ieee80211_vif_cfg_change_notify(sdata,
2299	changed: BSS_CHANGED_ARP_FILTER);
2300
2301	list_del(entry: &sdata->list);
2302	cfg80211_unregister_wdev(wdev: &sdata->wdev);
2303
2304	if (!netdev)
2305	kfree(objp: sdata);
2306	}
2307	wiphy_unlock(wiphy: local->hw.wiphy);
2308	}
2309
2310	static int netdev_notify(struct notifier_block *nb,
2311	unsigned long state, void *ptr)
2312	{
2313	struct net_device *dev = netdev_notifier_info_to_dev(info: ptr);
2314	struct ieee80211_sub_if_data *sdata;
2315
2316	if (state != NETDEV_CHANGENAME)
2317	return NOTIFY_DONE;
2318
2319	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2320	return NOTIFY_DONE;
2321
2322	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2323	return NOTIFY_DONE;
2324
2325	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2326	memcpy(sdata->name, dev->name, IFNAMSIZ);
2327	ieee80211_debugfs_rename_netdev(sdata);
2328
2329	return NOTIFY_OK;
2330	}
2331
2332	static struct notifier_block mac80211_netdev_notifier = {
2333	.notifier_call = netdev_notify,
2334	};
2335
2336	int ieee80211_iface_init(void)
2337	{
2338	return register_netdevice_notifier(nb: &mac80211_netdev_notifier);
2339	}
2340
2341	void ieee80211_iface_exit(void)
2342	{
2343	unregister_netdevice_notifier(nb: &mac80211_netdev_notifier);
2344	}
2345
2346	void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2347	{
2348	if (sdata->vif.type == NL80211_IFTYPE_AP)
2349	atomic_inc(v: &sdata->u.ap.num_mcast_sta);
2350	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2351	atomic_inc(v: &sdata->u.vlan.num_mcast_sta);
2352	}
2353
2354	void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2355	{
2356	if (sdata->vif.type == NL80211_IFTYPE_AP)
2357	atomic_dec(v: &sdata->u.ap.num_mcast_sta);
2358	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2359	atomic_dec(v: &sdata->u.vlan.num_mcast_sta);
2360	}
2361