iface.c

   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) 2018-2025 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
  45static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
  46
  47bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link)
  48{
  49	struct ieee80211_chanctx_conf *chanctx_conf;
  50	int power;
  51
  52	rcu_read_lock();
  53	chanctx_conf = rcu_dereference(link->conf->chanctx_conf);
  54	if (!chanctx_conf) {
  55		rcu_read_unlock();
  56		return false;
  57	}
  58
  59	power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60	rcu_read_unlock();
  61
  62	if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63		power = min(power, link->user_power_level);
  64
  65	if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66		power = min(power, link->ap_power_level);
  67
  68	if (power != link->conf->txpower) {
  69		link->conf->txpower = power;
  70		return true;
  71	}
  72
  73	return false;
  74}
  75
  76void ieee80211_recalc_txpower(struct ieee80211_link_data *link,
  77			      bool update_bss)
  78{
  79	if (__ieee80211_recalc_txpower(link) ||
  80	    (update_bss && ieee80211_sdata_running(link->sdata)))
  81		ieee80211_link_info_change_notify(link->sdata, link,
  82						  BSS_CHANGED_TXPOWER);
  83}
  84
  85static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86{
  87	if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88		return 0;
  89
  90	local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91	return IEEE80211_CONF_CHANGE_IDLE;
  92}
  93
  94static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95{
  96	if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97		return 0;
  98
  99	ieee80211_flush_queues(local, NULL, false);
 100
 101	local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102	return IEEE80211_CONF_CHANGE_IDLE;
 103}
 104
 105static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106				   bool force_active)
 107{
 108	bool working, scanning, active;
 109	unsigned int led_trig_start = 0, led_trig_stop = 0;
 110	struct ieee80211_sub_if_data *iter;
 111
 112	lockdep_assert_wiphy(local->hw.wiphy);
 113
 114	active = force_active ||
 115		 !list_empty(&local->chanctx_list) ||
 116		 local->monitors;
 117
 118	working = !local->ops->remain_on_channel &&
 119		  !list_empty(&local->roc_list);
 120
 121	list_for_each_entry(iter, &local->interfaces, list) {
 122		if (iter->vif.type == NL80211_IFTYPE_NAN &&
 123		    iter->u.nan.started) {
 124			working = true;
 125			break;
 126		}
 127	}
 128
 129	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 130		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 131
 132	if (working || scanning)
 133		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 134	else
 135		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 136
 137	if (active)
 138		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 139	else
 140		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 141
 142	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 143
 144	if (working || scanning || active)
 145		return __ieee80211_idle_off(local);
 146	return __ieee80211_idle_on(local);
 147}
 148
 149u32 ieee80211_idle_off(struct ieee80211_local *local)
 150{
 151	return __ieee80211_recalc_idle(local, true);
 152}
 153
 154void ieee80211_recalc_idle(struct ieee80211_local *local)
 155{
 156	u32 change = __ieee80211_recalc_idle(local, false);
 157	if (change)
 158		ieee80211_hw_config(local, -1, change);
 159}
 160
 161static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 162				bool check_dup)
 163{
 164	struct ieee80211_local *local = sdata->local;
 165	struct ieee80211_sub_if_data *iter;
 166	u64 new, mask, tmp;
 167	u8 *m;
 168	int ret = 0;
 169
 170	lockdep_assert_wiphy(local->hw.wiphy);
 171
 172	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 173		return 0;
 174
 175	m = addr;
 176	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 177		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 178		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 179
 180	m = local->hw.wiphy->addr_mask;
 181	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 182		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 183		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 184
 185	if (!check_dup)
 186		return ret;
 187
 188	list_for_each_entry(iter, &local->interfaces, list) {
 189		if (iter == sdata)
 190			continue;
 191
 192		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 194			continue;
 195
 196		m = iter->vif.addr;
 197		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201		if ((new & ~mask) != (tmp & ~mask)) {
 202			ret = -EINVAL;
 203			break;
 204		}
 205	}
 206
 207	return ret;
 208}
 209
 210static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
 211{
 212	struct ieee80211_roc_work *roc;
 213	struct ieee80211_local *local = sdata->local;
 214	struct ieee80211_sub_if_data *scan_sdata;
 215	int ret = 0;
 216
 217	lockdep_assert_wiphy(local->hw.wiphy);
 218
 219	/* To be the most flexible here we want to only limit changing the
 220	 * address if the specific interface is doing offchannel work or
 221	 * scanning.
 222	 */
 223	if (netif_carrier_ok(sdata->dev))
 224		return -EBUSY;
 225
 226	/* if any stations are set known (so they know this vif too), reject */
 227	if (sta_info_get_by_idx(sdata, 0))
 228		return -EBUSY;
 229
 230	/* First check no ROC work is happening on this iface */
 231	list_for_each_entry(roc, &local->roc_list, list) {
 232		if (roc->sdata != sdata)
 233			continue;
 234
 235		if (roc->started) {
 236			ret = -EBUSY;
 237			goto unlock;
 238		}
 239	}
 240
 241	/* And if this iface is scanning */
 242	if (local->scanning) {
 243		scan_sdata = rcu_dereference_protected(local->scan_sdata,
 244						       lockdep_is_held(&local->hw.wiphy->mtx));
 245		if (sdata == scan_sdata)
 246			ret = -EBUSY;
 247	}
 248
 249	/*
 250	 * More interface types could be added here but changing the
 251	 * address while powered makes the most sense in client modes.
 252	 */
 253	switch (sdata->vif.type) {
 254	case NL80211_IFTYPE_STATION:
 255	case NL80211_IFTYPE_P2P_CLIENT:
 256		/* refuse while connecting */
 257		if (sdata->u.mgd.auth_data || sdata->u.mgd.assoc_data)
 258			return -EBUSY;
 259		break;
 260	default:
 261		ret = -EOPNOTSUPP;
 262	}
 263
 264unlock:
 265	return ret;
 266}
 267
 268static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
 269				 void *addr)
 270{
 271	struct ieee80211_local *local = sdata->local;
 272	struct sockaddr *sa = addr;
 273	bool check_dup = true;
 274	bool live = false;
 275	int ret;
 276
 277	if (ieee80211_sdata_running(sdata)) {
 278		ret = ieee80211_can_powered_addr_change(sdata);
 279		if (ret)
 280			return ret;
 281
 282		live = true;
 283	}
 284
 285	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 286	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 287		check_dup = false;
 288
 289	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 290	if (ret)
 291		return ret;
 292
 293	if (live)
 294		drv_remove_interface(local, sdata);
 295	ret = eth_mac_addr(sdata->dev, sa);
 296
 297	if (ret == 0) {
 298		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 299		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
 300	}
 301
 302	/* Regardless of eth_mac_addr() return we still want to add the
 303	 * interface back. This should not fail...
 304	 */
 305	if (live)
 306		WARN_ON(drv_add_interface(local, sdata));
 307
 308	return ret;
 309}
 310
 311static int ieee80211_change_mac(struct net_device *dev, void *addr)
 312{
 313	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 314	struct ieee80211_local *local = sdata->local;
 315
 316	/*
 317	 * This happens during unregistration if there's a bond device
 318	 * active (maybe other cases?) and we must get removed from it.
 319	 * But we really don't care anymore if it's not registered now.
 320	 */
 321	if (!dev->ieee80211_ptr->registered)
 322		return 0;
 323
 324	guard(wiphy)(local->hw.wiphy);
 325
 326	return _ieee80211_change_mac(sdata, addr);
 327}
 328
 329static inline int identical_mac_addr_allowed(int type1, int type2)
 330{
 331	return type1 == NL80211_IFTYPE_MONITOR ||
 332		type2 == NL80211_IFTYPE_MONITOR ||
 333		type1 == NL80211_IFTYPE_P2P_DEVICE ||
 334		type2 == NL80211_IFTYPE_P2P_DEVICE ||
 335		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 336		(type1 == NL80211_IFTYPE_AP_VLAN &&
 337			(type2 == NL80211_IFTYPE_AP ||
 338			 type2 == NL80211_IFTYPE_AP_VLAN));
 339}
 340
 341static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 342					    enum nl80211_iftype iftype)
 343{
 344	struct ieee80211_local *local = sdata->local;
 345	struct ieee80211_sub_if_data *nsdata;
 346
 347	ASSERT_RTNL();
 348	lockdep_assert_wiphy(local->hw.wiphy);
 349
 350	/* we hold the RTNL here so can safely walk the list */
 351	list_for_each_entry(nsdata, &local->interfaces, list) {
 352		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 353			struct ieee80211_link_data *link;
 354
 355			/*
 356			 * Only OCB and monitor mode may coexist
 357			 */
 358			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 359			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 360			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 361			     nsdata->vif.type == NL80211_IFTYPE_OCB))
 362				return -EBUSY;
 363
 364			/*
 365			 * Allow only a single IBSS interface to be up at any
 366			 * time. This is restricted because beacon distribution
 367			 * cannot work properly if both are in the same IBSS.
 368			 *
 369			 * To remove this restriction we'd have to disallow them
 370			 * from setting the same SSID on different IBSS interfaces
 371			 * belonging to the same hardware. Then, however, we're
 372			 * faced with having to adopt two different TSF timers...
 373			 */
 374			if (iftype == NL80211_IFTYPE_ADHOC &&
 375			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 376				return -EBUSY;
 377			/*
 378			 * will not add another interface while any channel
 379			 * switch is active.
 380			 */
 381			for_each_link_data(nsdata, link) {
 382				if (link->conf->csa_active)
 383					return -EBUSY;
 384			}
 385
 386			/*
 387			 * The remaining checks are only performed for interfaces
 388			 * with the same MAC address.
 389			 */
 390			if (!ether_addr_equal(sdata->vif.addr,
 391					      nsdata->vif.addr))
 392				continue;
 393
 394			/*
 395			 * check whether it may have the same address
 396			 */
 397			if (!identical_mac_addr_allowed(iftype,
 398							nsdata->vif.type))
 399				return -ENOTUNIQ;
 400
 401			/* No support for VLAN with MLO yet */
 402			if (iftype == NL80211_IFTYPE_AP_VLAN &&
 403			    sdata->wdev.use_4addr &&
 404			    nsdata->vif.type == NL80211_IFTYPE_AP &&
 405			    nsdata->vif.valid_links)
 406				return -EOPNOTSUPP;
 407
 408			/*
 409			 * can only add VLANs to enabled APs
 410			 */
 411			if (iftype == NL80211_IFTYPE_AP_VLAN &&
 412			    nsdata->vif.type == NL80211_IFTYPE_AP)
 413				sdata->bss = &nsdata->u.ap;
 414		}
 415	}
 416
 417	return ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
 418}
 419
 420static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 421				  enum nl80211_iftype iftype)
 422{
 423	int n_queues = sdata->local->hw.queues;
 424	int i;
 425
 426	if (iftype == NL80211_IFTYPE_NAN)
 427		return 0;
 428
 429	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 430		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 431			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 432					 IEEE80211_INVAL_HW_QUEUE))
 433				return -EINVAL;
 434			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 435					 n_queues))
 436				return -EINVAL;
 437		}
 438	}
 439
 440	if ((iftype != NL80211_IFTYPE_AP &&
 441	     iftype != NL80211_IFTYPE_P2P_GO &&
 442	     iftype != NL80211_IFTYPE_MESH_POINT) ||
 443	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 444		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 445		return 0;
 446	}
 447
 448	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 449		return -EINVAL;
 450
 451	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 452		return -EINVAL;
 453
 454	return 0;
 455}
 456
 457static int ieee80211_open(struct net_device *dev)
 458{
 459	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 460	int err;
 461
 462	/* fail early if user set an invalid address */
 463	if (!is_valid_ether_addr(dev->dev_addr))
 464		return -EADDRNOTAVAIL;
 465
 466	guard(wiphy)(sdata->local->hw.wiphy);
 467
 468	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 469	if (err)
 470		return err;
 471
 472	return ieee80211_do_open(&sdata->wdev, true);
 473}
 474
 475static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 476{
 477	struct ieee80211_local *local = sdata->local;
 478	unsigned long flags;
 479	struct sk_buff_head freeq;
 480	struct sk_buff *skb, *tmp;
 481	u32 hw_reconf_flags = 0;
 482	int i, flushed;
 483	struct ps_data *ps;
 484	struct cfg80211_chan_def chandef;
 485	bool cancel_scan;
 486	struct cfg80211_nan_func *func;
 487
 488	lockdep_assert_wiphy(local->hw.wiphy);
 489
 490	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 491	synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 492
 493	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 494	if (cancel_scan)
 495		ieee80211_scan_cancel(local);
 496
 497	ieee80211_roc_purge(local, sdata);
 498
 499	switch (sdata->vif.type) {
 500	case NL80211_IFTYPE_STATION:
 501		ieee80211_mgd_stop(sdata);
 502		break;
 503	case NL80211_IFTYPE_ADHOC:
 504		ieee80211_ibss_stop(sdata);
 505		break;
 506	case NL80211_IFTYPE_MONITOR:
 507		list_del_rcu(&sdata->u.mntr.list);
 508		break;
 509	case NL80211_IFTYPE_AP_VLAN:
 510		ieee80211_apvlan_link_clear(sdata);
 511		break;
 512	default:
 513		break;
 514	}
 515
 516	/*
 517	 * Remove all stations associated with this interface.
 518	 *
 519	 * This must be done before calling ops->remove_interface()
 520	 * because otherwise we can later invoke ops->sta_notify()
 521	 * whenever the STAs are removed, and that invalidates driver
 522	 * assumptions about always getting a vif pointer that is valid
 523	 * (because if we remove a STA after ops->remove_interface()
 524	 * the driver will have removed the vif info already!)
 525	 *
 526	 * For AP_VLANs stations may exist since there's nothing else that
 527	 * would have removed them, but in other modes there shouldn't
 528	 * be any stations.
 529	 */
 530	flushed = sta_info_flush(sdata, -1);
 531	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 532
 533	/* don't count this interface for allmulti while it is down */
 534	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 535		atomic_dec(&local->iff_allmultis);
 536
 537	if (sdata->vif.type == NL80211_IFTYPE_AP) {
 538		local->fif_pspoll--;
 539		local->fif_probe_req--;
 540	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 541		local->fif_probe_req--;
 542	}
 543
 544	if (sdata->dev) {
 545		netif_addr_lock_bh(sdata->dev);
 546		spin_lock_bh(&local->filter_lock);
 547		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 548				 sdata->dev->addr_len);
 549		spin_unlock_bh(&local->filter_lock);
 550		netif_addr_unlock_bh(sdata->dev);
 551	}
 552
 553	timer_delete_sync(&local->dynamic_ps_timer);
 554	wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
 555
 556	WARN(ieee80211_vif_is_mld(&sdata->vif),
 557	     "destroying interface with valid links 0x%04x\n",
 558	     sdata->vif.valid_links);
 559
 560	sdata->vif.bss_conf.csa_active = false;
 561	if (sdata->vif.type == NL80211_IFTYPE_STATION)
 562		sdata->deflink.u.mgd.csa.waiting_bcn = false;
 563	ieee80211_vif_unblock_queues_csa(sdata);
 564
 565	wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work);
 566	wiphy_work_cancel(local->hw.wiphy,
 567			  &sdata->deflink.color_change_finalize_work);
 568	wiphy_delayed_work_cancel(local->hw.wiphy,
 569				  &sdata->deflink.dfs_cac_timer_work);
 570
 571	if (sdata->wdev.links[0].cac_started) {
 572		chandef = sdata->vif.bss_conf.chanreq.oper;
 573		WARN_ON(local->suspended);
 574		ieee80211_link_release_channel(&sdata->deflink);
 575		cfg80211_cac_event(sdata->dev, &chandef,
 576				   NL80211_RADAR_CAC_ABORTED,
 577				   GFP_KERNEL, 0);
 578	}
 579
 580	if (sdata->vif.type == NL80211_IFTYPE_AP) {
 581		WARN_ON(!list_empty(&sdata->u.ap.vlans));
 582	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 583		/* remove all packets in parent bc_buf pointing to this dev */
 584		ps = &sdata->bss->ps;
 585
 586		spin_lock_irqsave(&ps->bc_buf.lock, flags);
 587		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 588			if (skb->dev == sdata->dev) {
 589				__skb_unlink(skb, &ps->bc_buf);
 590				local->total_ps_buffered--;
 591				ieee80211_free_txskb(&local->hw, skb);
 592			}
 593		}
 594		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 595	}
 596
 597	if (going_down)
 598		local->open_count--;
 599
 600	switch (sdata->vif.type) {
 601	case NL80211_IFTYPE_AP_VLAN:
 602		list_del(&sdata->u.vlan.list);
 603		RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
 604		/* see comment in the default case below */
 605		ieee80211_free_keys(sdata, true);
 606		/* no need to tell driver */
 607		break;
 608	case NL80211_IFTYPE_MONITOR:
 609		local->monitors--;
 610
 611		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) &&
 612		    !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
 613
 614			local->virt_monitors--;
 615			if (local->virt_monitors == 0) {
 616				local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 617				hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 618			}
 619
 620			ieee80211_adjust_monitor_flags(sdata, -1);
 621		}
 622		break;
 623	case NL80211_IFTYPE_NAN:
 624		/* clean all the functions */
 625		spin_lock_bh(&sdata->u.nan.func_lock);
 626
 627		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 628			idr_remove(&sdata->u.nan.function_inst_ids, i);
 629			cfg80211_free_nan_func(func);
 630		}
 631		idr_destroy(&sdata->u.nan.function_inst_ids);
 632
 633		spin_unlock_bh(&sdata->u.nan.func_lock);
 634		break;
 635	default:
 636		wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
 637		/*
 638		 * When we get here, the interface is marked down.
 639		 * Free the remaining keys, if there are any
 640		 * (which can happen in AP mode if userspace sets
 641		 * keys before the interface is operating)
 642		 *
 643		 * Force the key freeing to always synchronize_net()
 644		 * to wait for the RX path in case it is using this
 645		 * interface enqueuing frames at this very time on
 646		 * another CPU.
 647		 */
 648		ieee80211_free_keys(sdata, true);
 649		skb_queue_purge(&sdata->skb_queue);
 650		skb_queue_purge(&sdata->status_queue);
 651	}
 652
 653	/*
 654	 * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
 655	 * which should be called with interrupts enabled, reclamation
 656	 * is done in two phases:
 657	 */
 658	__skb_queue_head_init(&freeq);
 659
 660	/* unlink from local queues... */
 661	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 662	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 663		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 664			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 665			if (info->control.vif == &sdata->vif) {
 666				__skb_unlink(skb, &local->pending[i]);
 667				__skb_queue_tail(&freeq, skb);
 668			}
 669		}
 670	}
 671	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 672
 673	/* ... and perform actual reclamation with interrupts enabled. */
 674	skb_queue_walk_safe(&freeq, skb, tmp) {
 675		__skb_unlink(skb, &freeq);
 676		ieee80211_free_txskb(&local->hw, skb);
 677	}
 678
 679	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 680		ieee80211_txq_remove_vlan(local, sdata);
 681
 682	if (sdata->vif.txq)
 683		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
 684
 685	sdata->bss = NULL;
 686
 687	if (local->open_count == 0)
 688		ieee80211_clear_tx_pending(local);
 689
 690	sdata->vif.bss_conf.beacon_int = 0;
 691
 692	/*
 693	 * If the interface goes down while suspended, presumably because
 694	 * the device was unplugged and that happens before our resume,
 695	 * then the driver is already unconfigured and the remainder of
 696	 * this function isn't needed.
 697	 * XXX: what about WoWLAN? If the device has software state, e.g.
 698	 *	memory allocated, it might expect teardown commands from
 699	 *	mac80211 here?
 700	 */
 701	if (local->suspended) {
 702		WARN_ON(local->wowlan);
 703		WARN_ON(rcu_access_pointer(local->monitor_sdata));
 704		return;
 705	}
 706
 707	switch (sdata->vif.type) {
 708	case NL80211_IFTYPE_AP_VLAN:
 709		break;
 710	case NL80211_IFTYPE_MONITOR:
 711		if (local->virt_monitors == 0)
 712			ieee80211_del_virtual_monitor(local);
 713
 714		ieee80211_recalc_idle(local);
 715		ieee80211_recalc_offload(local);
 716
 717		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) &&
 718		    !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
 719			break;
 720
 721		ieee80211_link_release_channel(&sdata->deflink);
 722		fallthrough;
 723	default:
 724		if (!going_down)
 725			break;
 726		drv_remove_interface(local, sdata);
 727
 728		/* Clear private driver data to prevent reuse */
 729		memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size);
 730	}
 731
 732	ieee80211_recalc_ps(local);
 733
 734	if (cancel_scan)
 735		wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
 736
 737	if (local->open_count == 0) {
 738		ieee80211_stop_device(local, false);
 739
 740		/* no reconfiguring after stop! */
 741		return;
 742	}
 743
 744	/* do after stop to avoid reconfiguring when we stop anyway */
 745	ieee80211_configure_filter(local);
 746	ieee80211_hw_config(local, -1, hw_reconf_flags);
 747
 748	/* Passing NULL means an interface is picked for configuration */
 749	if (local->virt_monitors == local->open_count)
 750		ieee80211_add_virtual_monitor(local, NULL);
 751}
 752
 753void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 754{
 755	struct ieee80211_sub_if_data *tx_sdata;
 756	struct ieee80211_bss_conf *link_conf, *tx_bss_conf;
 757	struct ieee80211_link_data *tx_link, *link;
 758	unsigned int link_id;
 759
 760	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 761
 762	/* Check if any of the links of current sdata is an MBSSID. */
 763	for_each_vif_active_link(&sdata->vif, link_conf, link_id) {
 764		tx_bss_conf = sdata_dereference(link_conf->tx_bss_conf, sdata);
 765		if (!tx_bss_conf)
 766			continue;
 767
 768		tx_sdata = vif_to_sdata(tx_bss_conf->vif);
 769		RCU_INIT_POINTER(link_conf->tx_bss_conf, NULL);
 770
 771		/* If we are not tx sdata reset tx sdata's tx_bss_conf to avoid recusrion
 772		 * while closing tx sdata at the end of outer loop below.
 773		 */
 774		if (sdata != tx_sdata) {
 775			tx_link = sdata_dereference(tx_sdata->link[tx_bss_conf->link_id],
 776						    tx_sdata);
 777			if (!tx_link)
 778				continue;
 779
 780			RCU_INIT_POINTER(tx_link->conf->tx_bss_conf, NULL);
 781		}
 782
 783		/* loop through sdatas to find if any of their links
 784		 * belong to same MBSSID set as the one getting deleted.
 785		 */
 786		for_each_sdata_link(tx_sdata->local, link) {
 787			struct ieee80211_sub_if_data *link_sdata = link->sdata;
 788
 789			if (link_sdata == sdata || link_sdata == tx_sdata ||
 790			    rcu_access_pointer(link->conf->tx_bss_conf) != tx_bss_conf)
 791				continue;
 792
 793			RCU_INIT_POINTER(link->conf->tx_bss_conf, NULL);
 794
 795			/* Remove all links of matching MLD until dynamic link
 796			 * removal can be supported.
 797			 */
 798			cfg80211_stop_iface(link_sdata->wdev.wiphy, &link_sdata->wdev,
 799					    GFP_KERNEL);
 800		}
 801
 802		/* If we are not tx sdata, remove links of tx sdata and proceed */
 803		if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata))
 804			cfg80211_stop_iface(tx_sdata->wdev.wiphy,
 805					    &tx_sdata->wdev, GFP_KERNEL);
 806	}
 807}
 808
 809static int ieee80211_stop(struct net_device *dev)
 810{
 811	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 812
 813	/* close dependent VLAN interfaces before locking wiphy */
 814	if (sdata->vif.type == NL80211_IFTYPE_AP) {
 815		struct ieee80211_sub_if_data *vlan, *tmpsdata;
 816
 817		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 818					 u.vlan.list)
 819			dev_close(vlan->dev);
 820	}
 821
 822	guard(wiphy)(sdata->local->hw.wiphy);
 823
 824	wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work);
 825
 826	/* Close the dependent MBSSID interfaces with wiphy lock as we may be
 827	 * terminating its partner links too in case of MLD.
 828	 */
 829	if (sdata->vif.type == NL80211_IFTYPE_AP)
 830		ieee80211_stop_mbssid(sdata);
 831
 832	ieee80211_do_stop(sdata, true);
 833
 834	return 0;
 835}
 836
 837static void ieee80211_set_multicast_list(struct net_device *dev)
 838{
 839	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 840	struct ieee80211_local *local = sdata->local;
 841	int allmulti, sdata_allmulti;
 842
 843	allmulti = !!(dev->flags & IFF_ALLMULTI);
 844	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 845
 846	if (allmulti != sdata_allmulti) {
 847		if (dev->flags & IFF_ALLMULTI)
 848			atomic_inc(&local->iff_allmultis);
 849		else
 850			atomic_dec(&local->iff_allmultis);
 851		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 852	}
 853
 854	spin_lock_bh(&local->filter_lock);
 855	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 856	spin_unlock_bh(&local->filter_lock);
 857	wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter);
 858}
 859
 860/*
 861 * Called when the netdev is removed or, by the code below, before
 862 * the interface type changes.
 863 */
 864static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 865{
 866	if (WARN_ON(!list_empty(&sdata->work.entry)))
 867		wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
 868
 869	/* free extra data */
 870	ieee80211_free_keys(sdata, false);
 871
 872	ieee80211_debugfs_remove_netdev(sdata);
 873
 874	ieee80211_destroy_frag_cache(&sdata->frags);
 875
 876	if (ieee80211_vif_is_mesh(&sdata->vif))
 877		ieee80211_mesh_teardown_sdata(sdata);
 878
 879	ieee80211_vif_clear_links(sdata);
 880	ieee80211_link_stop(&sdata->deflink);
 881}
 882
 883static void ieee80211_uninit(struct net_device *dev)
 884{
 885	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 886}
 887
 888static int ieee80211_netdev_setup_tc(struct net_device *dev,
 889				     enum tc_setup_type type, void *type_data)
 890{
 891	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 892	struct ieee80211_local *local = sdata->local;
 893
 894	return drv_net_setup_tc(local, sdata, dev, type, type_data);
 895}
 896
 897static const struct net_device_ops ieee80211_dataif_ops = {
 898	.ndo_open		= ieee80211_open,
 899	.ndo_stop		= ieee80211_stop,
 900	.ndo_uninit		= ieee80211_uninit,
 901	.ndo_start_xmit		= ieee80211_subif_start_xmit,
 902	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
 903	.ndo_set_mac_address 	= ieee80211_change_mac,
 904	.ndo_setup_tc		= ieee80211_netdev_setup_tc,
 905};
 906
 907static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 908					  struct sk_buff *skb,
 909					  struct net_device *sb_dev)
 910{
 911	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 912	struct ieee80211_local *local = sdata->local;
 913	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 914	struct ieee80211_hdr *hdr;
 915	int len_rthdr;
 916
 917	if (local->hw.queues < IEEE80211_NUM_ACS)
 918		return 0;
 919
 920	/* reset flags and info before parsing radiotap header */
 921	memset(info, 0, sizeof(*info));
 922
 923	if (!ieee80211_parse_tx_radiotap(skb, dev))
 924		return 0; /* doesn't matter, frame will be dropped */
 925
 926	len_rthdr = ieee80211_get_radiotap_len(skb->data);
 927	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 928	if (skb->len < len_rthdr + 2 ||
 929	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 930		return 0; /* doesn't matter, frame will be dropped */
 931
 932	return ieee80211_select_queue_80211(sdata, skb, hdr);
 933}
 934
 935static const struct net_device_ops ieee80211_monitorif_ops = {
 936	.ndo_open		= ieee80211_open,
 937	.ndo_stop		= ieee80211_stop,
 938	.ndo_uninit		= ieee80211_uninit,
 939	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
 940	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
 941	.ndo_set_mac_address 	= ieee80211_change_mac,
 942	.ndo_select_queue	= ieee80211_monitor_select_queue,
 943};
 944
 945static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 946					      struct net_device_path *path)
 947{
 948	struct ieee80211_sub_if_data *sdata;
 949	struct ieee80211_local *local;
 950	struct sta_info *sta;
 951	int ret = -ENOENT;
 952
 953	sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 954	local = sdata->local;
 955
 956	if (!local->ops->net_fill_forward_path)
 957		return -EOPNOTSUPP;
 958
 959	rcu_read_lock();
 960	switch (sdata->vif.type) {
 961	case NL80211_IFTYPE_AP_VLAN:
 962		sta = rcu_dereference(sdata->u.vlan.sta);
 963		if (sta)
 964			break;
 965		if (sdata->wdev.use_4addr)
 966			goto out;
 967		if (is_multicast_ether_addr(ctx->daddr))
 968			goto out;
 969		sta = sta_info_get_bss(sdata, ctx->daddr);
 970		break;
 971	case NL80211_IFTYPE_AP:
 972		if (is_multicast_ether_addr(ctx->daddr))
 973			goto out;
 974		sta = sta_info_get(sdata, ctx->daddr);
 975		break;
 976	case NL80211_IFTYPE_STATION:
 977		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 978			sta = sta_info_get(sdata, ctx->daddr);
 979			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 980				if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 981					goto out;
 982
 983				break;
 984			}
 985		}
 986
 987		sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 988		break;
 989	default:
 990		goto out;
 991	}
 992
 993	if (!sta)
 994		goto out;
 995
 996	ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 997out:
 998	rcu_read_unlock();
 999
1000	return ret;
1001}
1002
1003static const struct net_device_ops ieee80211_dataif_8023_ops = {
1004	.ndo_open		= ieee80211_open,
1005	.ndo_stop		= ieee80211_stop,
1006	.ndo_uninit		= ieee80211_uninit,
1007	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
1008	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1009	.ndo_set_mac_address	= ieee80211_change_mac,
1010	.ndo_fill_forward_path	= ieee80211_netdev_fill_forward_path,
1011	.ndo_setup_tc		= ieee80211_netdev_setup_tc,
1012};
1013
1014static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
1015{
1016	switch (iftype) {
1017	/* P2P GO and client are mapped to AP/STATION types */
1018	case NL80211_IFTYPE_AP:
1019	case NL80211_IFTYPE_STATION:
1020		return true;
1021	default:
1022		return false;
1023	}
1024}
1025
1026static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
1027{
1028	struct ieee80211_local *local = sdata->local;
1029	u32 flags;
1030
1031	flags = sdata->vif.offload_flags;
1032
1033	if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
1034	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1035		flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
1036
1037		if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1038		    local->hw.wiphy->frag_threshold != (u32)-1)
1039			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1040
1041		if (local->virt_monitors)
1042			flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1043	} else {
1044		flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1045	}
1046
1047	if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
1048	    ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1049		flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
1050
1051		if (local->virt_monitors &&
1052		    !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
1053			flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1054	} else {
1055		flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1056	}
1057
1058	if (sdata->vif.offload_flags == flags)
1059		return false;
1060
1061	sdata->vif.offload_flags = flags;
1062	ieee80211_check_fast_rx_iface(sdata);
1063	return true;
1064}
1065
1066static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1067{
1068	struct ieee80211_local *local = sdata->local;
1069	struct ieee80211_sub_if_data *bss = sdata;
1070	bool enabled;
1071
1072	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1073		if (!sdata->bss)
1074			return;
1075
1076		bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1077	}
1078
1079	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1080	    !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1081		return;
1082
1083	enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1084	if (sdata->wdev.use_4addr &&
1085	    !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1086		enabled = false;
1087
1088	sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1089					   &ieee80211_dataif_ops;
1090}
1091
1092static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1093{
1094	struct ieee80211_local *local = sdata->local;
1095	struct ieee80211_sub_if_data *vsdata;
1096
1097	if (ieee80211_set_sdata_offload_flags(sdata)) {
1098		drv_update_vif_offload(local, sdata);
1099		ieee80211_set_vif_encap_ops(sdata);
1100	}
1101
1102	list_for_each_entry(vsdata, &local->interfaces, list) {
1103		if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1104		    vsdata->bss != &sdata->u.ap)
1105			continue;
1106
1107		ieee80211_set_vif_encap_ops(vsdata);
1108	}
1109}
1110
1111void ieee80211_recalc_offload(struct ieee80211_local *local)
1112{
1113	struct ieee80211_sub_if_data *sdata;
1114
1115	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1116		return;
1117
1118	lockdep_assert_wiphy(local->hw.wiphy);
1119
1120	list_for_each_entry(sdata, &local->interfaces, list) {
1121		if (!ieee80211_sdata_running(sdata))
1122			continue;
1123
1124		ieee80211_recalc_sdata_offload(sdata);
1125	}
1126}
1127
1128void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1129				    const int offset)
1130{
1131	struct ieee80211_local *local = sdata->local;
1132	u32 flags = sdata->u.mntr.flags;
1133
1134#define ADJUST(_f, _s)	do {					\
1135	if (flags & MONITOR_FLAG_##_f)				\
1136		local->fif_##_s += offset;			\
1137	} while (0)
1138
1139	ADJUST(FCSFAIL, fcsfail);
1140	ADJUST(PLCPFAIL, plcpfail);
1141	ADJUST(CONTROL, control);
1142	ADJUST(CONTROL, pspoll);
1143	ADJUST(OTHER_BSS, other_bss);
1144	if (!(flags & MONITOR_FLAG_SKIP_TX))
1145		local->tx_mntrs += offset;
1146
1147#undef ADJUST
1148}
1149
1150static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1151{
1152	struct ieee80211_local *local = sdata->local;
1153	int i;
1154
1155	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1156		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1157			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1158		else if (local->hw.queues >= IEEE80211_NUM_ACS)
1159			sdata->vif.hw_queue[i] = i;
1160		else
1161			sdata->vif.hw_queue[i] = 0;
1162	}
1163	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1164}
1165
1166static void ieee80211_sdata_init(struct ieee80211_local *local,
1167				 struct ieee80211_sub_if_data *sdata)
1168{
1169	sdata->local = local;
1170
1171	INIT_LIST_HEAD(&sdata->key_list);
1172
1173	/*
1174	 * Initialize the default link, so we can use link_id 0 for non-MLD,
1175	 * and that continues to work for non-MLD-aware drivers that use just
1176	 * vif.bss_conf instead of vif.link_conf.
1177	 *
1178	 * Note that we never change this, so if link ID 0 isn't used in an
1179	 * MLD connection, we get a separate allocation for it.
1180	 */
1181	ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1182}
1183
1184int ieee80211_add_virtual_monitor(struct ieee80211_local *local,
1185				  struct ieee80211_sub_if_data *creator_sdata)
1186{
1187	struct ieee80211_sub_if_data *sdata;
1188	int ret;
1189
1190	ASSERT_RTNL();
1191	lockdep_assert_wiphy(local->hw.wiphy);
1192
1193	if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1194		return 0;
1195
1196	/* Already have a monitor set up, configure it */
1197	sdata = wiphy_dereference(local->hw.wiphy, local->monitor_sdata);
1198	if (sdata)
1199		goto configure_monitor;
1200
1201	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1202	if (!sdata)
1203		return -ENOMEM;
1204
1205	/* set up data */
1206	sdata->vif.type = NL80211_IFTYPE_MONITOR;
1207	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1208		 wiphy_name(local->hw.wiphy));
1209	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1210	sdata->wdev.wiphy = local->hw.wiphy;
1211
1212	ieee80211_sdata_init(local, sdata);
1213
1214	ieee80211_set_default_queues(sdata);
1215
1216	if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1217		ret = drv_add_interface(local, sdata);
1218		if (WARN_ON(ret)) {
1219			/* ok .. stupid driver, it asked for this! */
1220			kfree(sdata);
1221			return ret;
1222		}
1223	}
1224
1225	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1226
1227	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1228	if (ret) {
1229		kfree(sdata);
1230		return ret;
1231	}
1232
1233	mutex_lock(&local->iflist_mtx);
1234	rcu_assign_pointer(local->monitor_sdata, sdata);
1235	mutex_unlock(&local->iflist_mtx);
1236
1237	ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq,
1238					 IEEE80211_CHANCTX_EXCLUSIVE);
1239	if (ret) {
1240		mutex_lock(&local->iflist_mtx);
1241		RCU_INIT_POINTER(local->monitor_sdata, NULL);
1242		mutex_unlock(&local->iflist_mtx);
1243		synchronize_net();
1244		drv_remove_interface(local, sdata);
1245		kfree(sdata);
1246		return ret;
1247	}
1248
1249	skb_queue_head_init(&sdata->skb_queue);
1250	skb_queue_head_init(&sdata->status_queue);
1251	wiphy_work_init(&sdata->work, ieee80211_iface_work);
1252
1253configure_monitor:
1254	/* Copy in the MU-MIMO configuration if set */
1255	if (!creator_sdata) {
1256		struct ieee80211_sub_if_data *other;
1257
1258		list_for_each_entry_rcu(other, &local->mon_list, u.mntr.list) {
1259			if (!other->vif.bss_conf.mu_mimo_owner)
1260				continue;
1261
1262			creator_sdata = other;
1263			break;
1264		}
1265	}
1266
1267	if (creator_sdata && creator_sdata->vif.bss_conf.mu_mimo_owner) {
1268		sdata->vif.bss_conf.mu_mimo_owner = true;
1269		memcpy(&sdata->vif.bss_conf.mu_group,
1270		       &creator_sdata->vif.bss_conf.mu_group,
1271		       sizeof(sdata->vif.bss_conf.mu_group));
1272		memcpy(&sdata->u.mntr.mu_follow_addr,
1273		       creator_sdata->u.mntr.mu_follow_addr, ETH_ALEN);
1274
1275		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1276						  BSS_CHANGED_MU_GROUPS);
1277	}
1278
1279	return 0;
1280}
1281
1282void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1283{
1284	struct ieee80211_sub_if_data *sdata;
1285
1286	if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1287		return;
1288
1289	ASSERT_RTNL();
1290	lockdep_assert_wiphy(local->hw.wiphy);
1291
1292	mutex_lock(&local->iflist_mtx);
1293
1294	sdata = rcu_dereference_protected(local->monitor_sdata,
1295					  lockdep_is_held(&local->iflist_mtx));
1296	if (!sdata) {
1297		mutex_unlock(&local->iflist_mtx);
1298		return;
1299	}
1300
1301	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1302	ieee80211_link_release_channel(&sdata->deflink);
1303
1304	if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1305		drv_remove_interface(local, sdata);
1306
1307	RCU_INIT_POINTER(local->monitor_sdata, NULL);
1308	mutex_unlock(&local->iflist_mtx);
1309
1310	synchronize_net();
1311
1312	kfree(sdata);
1313}
1314
1315/*
1316 * NOTE: Be very careful when changing this function, it must NOT return
1317 * an error on interface type changes that have been pre-checked, so most
1318 * checks should be in ieee80211_check_concurrent_iface.
1319 */
1320int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1321{
1322	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1323	struct net_device *dev = wdev->netdev;
1324	struct ieee80211_local *local = sdata->local;
1325	u64 changed = 0;
1326	int res;
1327	u32 hw_reconf_flags = 0;
1328
1329	lockdep_assert_wiphy(local->hw.wiphy);
1330
1331	switch (sdata->vif.type) {
1332	case NL80211_IFTYPE_AP_VLAN: {
1333		struct ieee80211_sub_if_data *master;
1334
1335		if (!sdata->bss)
1336			return -ENOLINK;
1337
1338		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1339
1340		master = container_of(sdata->bss,
1341				      struct ieee80211_sub_if_data, u.ap);
1342		sdata->control_port_protocol =
1343			master->control_port_protocol;
1344		sdata->control_port_no_encrypt =
1345			master->control_port_no_encrypt;
1346		sdata->control_port_over_nl80211 =
1347			master->control_port_over_nl80211;
1348		sdata->control_port_no_preauth =
1349			master->control_port_no_preauth;
1350		sdata->vif.cab_queue = master->vif.cab_queue;
1351		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1352		       sizeof(sdata->vif.hw_queue));
1353		sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq;
1354
1355		sdata->crypto_tx_tailroom_needed_cnt +=
1356			master->crypto_tx_tailroom_needed_cnt;
1357
1358		ieee80211_apvlan_link_setup(sdata);
1359
1360		break;
1361		}
1362	case NL80211_IFTYPE_AP:
1363		sdata->bss = &sdata->u.ap;
1364		break;
1365	case NL80211_IFTYPE_MESH_POINT:
1366	case NL80211_IFTYPE_STATION:
1367	case NL80211_IFTYPE_MONITOR:
1368	case NL80211_IFTYPE_ADHOC:
1369	case NL80211_IFTYPE_P2P_DEVICE:
1370	case NL80211_IFTYPE_OCB:
1371	case NL80211_IFTYPE_NAN:
1372		/* no special treatment */
1373		break;
1374	case NL80211_IFTYPE_UNSPECIFIED:
1375	case NUM_NL80211_IFTYPES:
1376	case NL80211_IFTYPE_P2P_CLIENT:
1377	case NL80211_IFTYPE_P2P_GO:
1378	case NL80211_IFTYPE_WDS:
1379		/* cannot happen */
1380		WARN_ON(1);
1381		break;
1382	}
1383
1384	if (local->open_count == 0) {
1385		/* here we can consider everything in good order (again) */
1386		local->reconfig_failure = false;
1387
1388		res = drv_start(local);
1389		if (res)
1390			goto err_del_bss;
1391		ieee80211_led_radio(local, true);
1392		ieee80211_mod_tpt_led_trig(local,
1393					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1394	}
1395
1396	/*
1397	 * Copy the hopefully now-present MAC address to
1398	 * this interface, if it has the special null one.
1399	 */
1400	if (dev && is_zero_ether_addr(dev->dev_addr)) {
1401		eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1402		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1403
1404		if (!is_valid_ether_addr(dev->dev_addr)) {
1405			res = -EADDRNOTAVAIL;
1406			goto err_stop;
1407		}
1408	}
1409
1410	sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1411				(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE);
1412	switch (sdata->vif.type) {
1413	case NL80211_IFTYPE_AP_VLAN:
1414		/* no need to tell driver, but set carrier and chanctx */
1415		if (sdata->bss->active) {
1416			struct ieee80211_link_data *link;
1417
1418			for_each_link_data(sdata, link) {
1419				ieee80211_link_vlan_copy_chanctx(link);
1420			}
1421
1422			netif_carrier_on(dev);
1423			ieee80211_set_vif_encap_ops(sdata);
1424		} else {
1425			netif_carrier_off(dev);
1426		}
1427		break;
1428	case NL80211_IFTYPE_MONITOR:
1429		if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1430		    ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1431			res = drv_add_interface(local, sdata);
1432			if (res)
1433				goto err_stop;
1434		} else {
1435			/* add/configure if there is no non-monitor interface */
1436			if (local->virt_monitors == local->open_count) {
1437				res = ieee80211_add_virtual_monitor(local, sdata);
1438				if (res)
1439					goto err_stop;
1440			}
1441
1442			local->virt_monitors++;
1443
1444			/* must be before the call to ieee80211_configure_filter */
1445			if (local->virt_monitors == 1) {
1446				local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1447				hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1448			}
1449		}
1450
1451		local->monitors++;
1452
1453		ieee80211_adjust_monitor_flags(sdata, 1);
1454		ieee80211_configure_filter(local);
1455		ieee80211_recalc_offload(local);
1456		ieee80211_recalc_idle(local);
1457
1458		netif_carrier_on(dev);
1459		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1460		break;
1461	default:
1462		if (coming_up) {
1463			ieee80211_del_virtual_monitor(local);
1464			ieee80211_set_sdata_offload_flags(sdata);
1465
1466			res = drv_add_interface(local, sdata);
1467			if (res)
1468				goto err_stop;
1469
1470			ieee80211_set_vif_encap_ops(sdata);
1471			res = ieee80211_check_queues(sdata,
1472				ieee80211_vif_type_p2p(&sdata->vif));
1473			if (res)
1474				goto err_del_interface;
1475		}
1476
1477		if (sdata->vif.type == NL80211_IFTYPE_AP) {
1478			local->fif_pspoll++;
1479			local->fif_probe_req++;
1480
1481			ieee80211_configure_filter(local);
1482		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1483			local->fif_probe_req++;
1484		}
1485
1486		if (sdata->vif.probe_req_reg)
1487			drv_config_iface_filter(local, sdata,
1488						FIF_PROBE_REQ,
1489						FIF_PROBE_REQ);
1490
1491		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1492		    sdata->vif.type != NL80211_IFTYPE_NAN)
1493			changed |= ieee80211_reset_erp_info(sdata);
1494		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1495						  changed);
1496
1497		switch (sdata->vif.type) {
1498		case NL80211_IFTYPE_STATION:
1499		case NL80211_IFTYPE_ADHOC:
1500		case NL80211_IFTYPE_AP:
1501		case NL80211_IFTYPE_MESH_POINT:
1502		case NL80211_IFTYPE_OCB:
1503			netif_carrier_off(dev);
1504			break;
1505		case NL80211_IFTYPE_P2P_DEVICE:
1506		case NL80211_IFTYPE_NAN:
1507			break;
1508		default:
1509			/* not reached */
1510			WARN_ON(1);
1511		}
1512
1513		/*
1514		 * Set default queue parameters so drivers don't
1515		 * need to initialise the hardware if the hardware
1516		 * doesn't start up with sane defaults.
1517		 * Enable QoS for anything but station interfaces.
1518		 */
1519		ieee80211_set_wmm_default(&sdata->deflink, true,
1520			sdata->vif.type != NL80211_IFTYPE_STATION);
1521	}
1522
1523	/*
1524	 * set_multicast_list will be invoked by the networking core
1525	 * which will check whether any increments here were done in
1526	 * error and sync them down to the hardware as filter flags.
1527	 */
1528	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1529		atomic_inc(&local->iff_allmultis);
1530
1531	if (coming_up)
1532		local->open_count++;
1533
1534	if (local->open_count == 1)
1535		ieee80211_hw_conf_init(local);
1536	else if (hw_reconf_flags)
1537		ieee80211_hw_config(local, -1, hw_reconf_flags);
1538
1539	ieee80211_recalc_ps(local);
1540
1541	set_bit(SDATA_STATE_RUNNING, &sdata->state);
1542
1543	return 0;
1544 err_del_interface:
1545	drv_remove_interface(local, sdata);
1546 err_stop:
1547	if (!local->open_count)
1548		drv_stop(local, false);
1549 err_del_bss:
1550	sdata->bss = NULL;
1551	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1552		list_del(&sdata->u.vlan.list);
1553	/* might already be clear but that doesn't matter */
1554	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1555	return res;
1556}
1557
1558static void ieee80211_if_setup(struct net_device *dev)
1559{
1560	ether_setup(dev);
1561	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1562	dev->priv_flags |= IFF_NO_QUEUE;
1563	dev->netdev_ops = &ieee80211_dataif_ops;
1564	dev->needs_free_netdev = true;
1565}
1566
1567static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1568					struct ieee80211_sub_if_data *sdata,
1569					struct sk_buff *skb)
1570{
1571	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1572
1573	lockdep_assert_wiphy(local->hw.wiphy);
1574
1575	if (ieee80211_is_action(mgmt->frame_control) &&
1576	    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1577		struct sta_info *sta;
1578		int len = skb->len;
1579
1580		sta = sta_info_get_bss(sdata, mgmt->sa);
1581		if (sta) {
1582			switch (mgmt->u.action.u.addba_req.action_code) {
1583			case WLAN_ACTION_ADDBA_REQ:
1584				ieee80211_process_addba_request(local, sta,
1585								mgmt, len);
1586				break;
1587			case WLAN_ACTION_ADDBA_RESP:
1588				ieee80211_process_addba_resp(local, sta,
1589							     mgmt, len);
1590				break;
1591			case WLAN_ACTION_DELBA:
1592				ieee80211_process_delba(sdata, sta,
1593							mgmt, len);
1594				break;
1595			default:
1596				WARN_ON(1);
1597				break;
1598			}
1599		}
1600	} else if (ieee80211_is_action(mgmt->frame_control) &&
1601		   mgmt->u.action.category == WLAN_CATEGORY_HT) {
1602		switch (mgmt->u.action.u.ht_smps.action) {
1603		case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
1604			u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
1605			struct ieee80211_rx_status *status;
1606			struct link_sta_info *link_sta;
1607			struct sta_info *sta;
1608
1609			sta = sta_info_get_bss(sdata, mgmt->sa);
1610			if (!sta)
1611				break;
1612
1613			status = IEEE80211_SKB_RXCB(skb);
1614			if (!status->link_valid)
1615				link_sta = &sta->deflink;
1616			else
1617				link_sta = rcu_dereference_protected(sta->link[status->link_id],
1618							lockdep_is_held(&local->hw.wiphy->mtx));
1619			if (link_sta)
1620				ieee80211_ht_handle_chanwidth_notif(local, sdata, sta,
1621								    link_sta, chanwidth,
1622								    status->band);
1623			break;
1624		}
1625		default:
1626			WARN_ON(1);
1627			break;
1628		}
1629	} else if (ieee80211_is_action(mgmt->frame_control) &&
1630		   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1631		switch (mgmt->u.action.u.vht_group_notif.action_code) {
1632		case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1633			struct ieee80211_rx_status *status;
1634			enum nl80211_band band;
1635			struct sta_info *sta;
1636			u8 opmode;
1637
1638			status = IEEE80211_SKB_RXCB(skb);
1639			band = status->band;
1640			opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1641
1642			sta = sta_info_get_bss(sdata, mgmt->sa);
1643
1644			if (sta)
1645				ieee80211_vht_handle_opmode(sdata,
1646							    &sta->deflink,
1647							    opmode, band);
1648
1649			break;
1650		}
1651		case WLAN_VHT_ACTION_GROUPID_MGMT:
1652			ieee80211_process_mu_groups(sdata, &sdata->deflink,
1653						    mgmt);
1654			break;
1655		default:
1656			WARN_ON(1);
1657			break;
1658		}
1659	} else if (ieee80211_is_action(mgmt->frame_control) &&
1660		   mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1661		switch (mgmt->u.action.u.s1g.action_code) {
1662		case WLAN_S1G_TWT_TEARDOWN:
1663		case WLAN_S1G_TWT_SETUP:
1664			ieee80211_s1g_rx_twt_action(sdata, skb);
1665			break;
1666		default:
1667			break;
1668		}
1669	} else if (ieee80211_is_action(mgmt->frame_control) &&
1670		   mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
1671		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1672			switch (mgmt->u.action.u.ttlm_req.action_code) {
1673			case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
1674				ieee80211_process_neg_ttlm_req(sdata, mgmt,
1675							       skb->len);
1676				break;
1677			case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
1678				ieee80211_process_neg_ttlm_res(sdata, mgmt,
1679							       skb->len);
1680				break;
1681			case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN:
1682				ieee80211_process_ttlm_teardown(sdata);
1683				break;
1684			case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP:
1685				ieee80211_process_ml_reconf_resp(sdata, mgmt,
1686								 skb->len);
1687				break;
1688			case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP:
1689				ieee80211_process_epcs_ena_resp(sdata, mgmt,
1690								skb->len);
1691				break;
1692			case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN:
1693				ieee80211_process_epcs_teardown(sdata, mgmt,
1694								skb->len);
1695				break;
1696			default:
1697				break;
1698			}
1699		}
1700	} else if (ieee80211_is_ext(mgmt->frame_control)) {
1701		if (sdata->vif.type == NL80211_IFTYPE_STATION)
1702			ieee80211_sta_rx_queued_ext(sdata, skb);
1703		else
1704			WARN_ON(1);
1705	} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1706		struct ieee80211_hdr *hdr = (void *)mgmt;
1707		struct sta_info *sta;
1708
1709		/*
1710		 * So the frame isn't mgmt, but frame_control
1711		 * is at the right place anyway, of course, so
1712		 * the if statement is correct.
1713		 *
1714		 * Warn if we have other data frame types here,
1715		 * they must not get here.
1716		 */
1717		WARN_ON(hdr->frame_control &
1718				cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1719		WARN_ON(!(hdr->seq_ctrl &
1720				cpu_to_le16(IEEE80211_SCTL_FRAG)));
1721		/*
1722		 * This was a fragment of a frame, received while
1723		 * a block-ack session was active. That cannot be
1724		 * right, so terminate the session.
1725		 */
1726		sta = sta_info_get_bss(sdata, mgmt->sa);
1727		if (sta) {
1728			u16 tid = ieee80211_get_tid(hdr);
1729
1730			__ieee80211_stop_rx_ba_session(
1731				sta, tid, WLAN_BACK_RECIPIENT,
1732				WLAN_REASON_QSTA_REQUIRE_SETUP,
1733				true);
1734		}
1735	} else switch (sdata->vif.type) {
1736	case NL80211_IFTYPE_STATION:
1737		ieee80211_sta_rx_queued_mgmt(sdata, skb);
1738		break;
1739	case NL80211_IFTYPE_ADHOC:
1740		ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1741		break;
1742	case NL80211_IFTYPE_MESH_POINT:
1743		if (!ieee80211_vif_is_mesh(&sdata->vif))
1744			break;
1745		ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1746		break;
1747	default:
1748		WARN(1, "frame for unexpected interface type");
1749		break;
1750	}
1751}
1752
1753static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1754					   struct sk_buff *skb)
1755{
1756	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1757
1758	if (ieee80211_is_action(mgmt->frame_control) &&
1759	    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1760		switch (mgmt->u.action.u.s1g.action_code) {
1761		case WLAN_S1G_TWT_TEARDOWN:
1762		case WLAN_S1G_TWT_SETUP:
1763			ieee80211_s1g_status_twt_action(sdata, skb);
1764			break;
1765		default:
1766			break;
1767		}
1768	}
1769}
1770
1771static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1772{
1773	struct ieee80211_sub_if_data *sdata =
1774		container_of(work, struct ieee80211_sub_if_data, work);
1775	struct ieee80211_local *local = sdata->local;
1776	struct sk_buff *skb;
1777
1778	if (!ieee80211_sdata_running(sdata))
1779		return;
1780
1781	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1782		return;
1783
1784	if (!ieee80211_can_run_worker(local))
1785		return;
1786
1787	/* first process frames */
1788	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1789		kcov_remote_start_common(skb_get_kcov_handle(skb));
1790
1791		if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1792			ieee80211_process_tdls_channel_switch(sdata, skb);
1793		else
1794			ieee80211_iface_process_skb(local, sdata, skb);
1795
1796		kfree_skb(skb);
1797		kcov_remote_stop();
1798	}
1799
1800	/* process status queue */
1801	while ((skb = skb_dequeue(&sdata->status_queue))) {
1802		kcov_remote_start_common(skb_get_kcov_handle(skb));
1803
1804		ieee80211_iface_process_status(sdata, skb);
1805		kfree_skb(skb);
1806
1807		kcov_remote_stop();
1808	}
1809
1810	/* then other type-dependent work */
1811	switch (sdata->vif.type) {
1812	case NL80211_IFTYPE_STATION:
1813		ieee80211_sta_work(sdata);
1814		break;
1815	case NL80211_IFTYPE_ADHOC:
1816		ieee80211_ibss_work(sdata);
1817		break;
1818	case NL80211_IFTYPE_MESH_POINT:
1819		if (!ieee80211_vif_is_mesh(&sdata->vif))
1820			break;
1821		ieee80211_mesh_work(sdata);
1822		break;
1823	case NL80211_IFTYPE_OCB:
1824		ieee80211_ocb_work(sdata);
1825		break;
1826	default:
1827		break;
1828	}
1829}
1830
1831static void ieee80211_activate_links_work(struct wiphy *wiphy,
1832					  struct wiphy_work *work)
1833{
1834	struct ieee80211_sub_if_data *sdata =
1835		container_of(work, struct ieee80211_sub_if_data,
1836			     activate_links_work);
1837	struct ieee80211_local *local = wiphy_priv(wiphy);
1838
1839	if (local->in_reconfig)
1840		return;
1841
1842	ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1843	sdata->desired_active_links = 0;
1844}
1845
1846/*
1847 * Helper function to initialise an interface to a specific type.
1848 */
1849static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1850				  enum nl80211_iftype type)
1851{
1852	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1853						    0xff, 0xff, 0xff};
1854
1855	/* clear type-dependent unions */
1856	memset(&sdata->u, 0, sizeof(sdata->u));
1857	memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1858
1859	/* and set some type-dependent values */
1860	sdata->vif.type = type;
1861	sdata->vif.p2p = false;
1862	sdata->wdev.iftype = type;
1863
1864	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1865	sdata->control_port_no_encrypt = false;
1866	sdata->control_port_over_nl80211 = false;
1867	sdata->control_port_no_preauth = false;
1868	sdata->vif.cfg.idle = true;
1869	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1870
1871	sdata->noack_map = 0;
1872
1873	/* only monitor/p2p-device differ */
1874	if (sdata->dev) {
1875		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1876		sdata->dev->type = ARPHRD_ETHER;
1877	}
1878
1879	skb_queue_head_init(&sdata->skb_queue);
1880	skb_queue_head_init(&sdata->status_queue);
1881	wiphy_work_init(&sdata->work, ieee80211_iface_work);
1882	wiphy_work_init(&sdata->activate_links_work,
1883			ieee80211_activate_links_work);
1884
1885	switch (type) {
1886	case NL80211_IFTYPE_P2P_GO:
1887		type = NL80211_IFTYPE_AP;
1888		sdata->vif.type = type;
1889		sdata->vif.p2p = true;
1890		fallthrough;
1891	case NL80211_IFTYPE_AP:
1892		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1893		INIT_LIST_HEAD(&sdata->u.ap.vlans);
1894		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1895		break;
1896	case NL80211_IFTYPE_P2P_CLIENT:
1897		type = NL80211_IFTYPE_STATION;
1898		sdata->vif.type = type;
1899		sdata->vif.p2p = true;
1900		fallthrough;
1901	case NL80211_IFTYPE_STATION:
1902		sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1903		ieee80211_sta_setup_sdata(sdata);
1904		break;
1905	case NL80211_IFTYPE_OCB:
1906		sdata->vif.bss_conf.bssid = bssid_wildcard;
1907		ieee80211_ocb_setup_sdata(sdata);
1908		break;
1909	case NL80211_IFTYPE_ADHOC:
1910		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1911		ieee80211_ibss_setup_sdata(sdata);
1912		break;
1913	case NL80211_IFTYPE_MESH_POINT:
1914		if (ieee80211_vif_is_mesh(&sdata->vif))
1915			ieee80211_mesh_init_sdata(sdata);
1916		break;
1917	case NL80211_IFTYPE_MONITOR:
1918		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1919		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1920		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1921				      MONITOR_FLAG_OTHER_BSS;
1922		break;
1923	case NL80211_IFTYPE_NAN:
1924		idr_init(&sdata->u.nan.function_inst_ids);
1925		spin_lock_init(&sdata->u.nan.func_lock);
1926		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1927		break;
1928	case NL80211_IFTYPE_AP_VLAN:
1929	case NL80211_IFTYPE_P2P_DEVICE:
1930		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1931		break;
1932	case NL80211_IFTYPE_UNSPECIFIED:
1933	case NL80211_IFTYPE_WDS:
1934	case NUM_NL80211_IFTYPES:
1935		WARN_ON(1);
1936		break;
1937	}
1938
1939	/* need to do this after the switch so vif.type is correct */
1940	ieee80211_link_setup(&sdata->deflink);
1941
1942	ieee80211_debugfs_recreate_netdev(sdata, false);
1943}
1944
1945static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1946					   enum nl80211_iftype type)
1947{
1948	struct ieee80211_local *local = sdata->local;
1949	int ret, err;
1950	enum nl80211_iftype internal_type = type;
1951	bool p2p = false;
1952
1953	ASSERT_RTNL();
1954
1955	if (!local->ops->change_interface)
1956		return -EBUSY;
1957
1958	/* for now, don't support changing while links exist */
1959	if (ieee80211_vif_is_mld(&sdata->vif))
1960		return -EBUSY;
1961
1962	switch (sdata->vif.type) {
1963	case NL80211_IFTYPE_AP:
1964		if (!list_empty(&sdata->u.ap.vlans))
1965			return -EBUSY;
1966		break;
1967	case NL80211_IFTYPE_STATION:
1968	case NL80211_IFTYPE_ADHOC:
1969	case NL80211_IFTYPE_OCB:
1970		/*
1971		 * Could maybe also all others here?
1972		 * Just not sure how that interacts
1973		 * with the RX/config path e.g. for
1974		 * mesh.
1975		 */
1976		break;
1977	default:
1978		return -EBUSY;
1979	}
1980
1981	switch (type) {
1982	case NL80211_IFTYPE_AP:
1983	case NL80211_IFTYPE_STATION:
1984	case NL80211_IFTYPE_ADHOC:
1985	case NL80211_IFTYPE_OCB:
1986		/*
1987		 * Could probably support everything
1988		 * but here.
1989		 */
1990		break;
1991	case NL80211_IFTYPE_P2P_CLIENT:
1992		p2p = true;
1993		internal_type = NL80211_IFTYPE_STATION;
1994		break;
1995	case NL80211_IFTYPE_P2P_GO:
1996		p2p = true;
1997		internal_type = NL80211_IFTYPE_AP;
1998		break;
1999	default:
2000		return -EBUSY;
2001	}
2002
2003	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
2004	if (ret)
2005		return ret;
2006
2007	ieee80211_stop_vif_queues(local, sdata,
2008				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
2009	/* do_stop will synchronize_rcu() first thing */
2010	ieee80211_do_stop(sdata, false);
2011
2012	ieee80211_teardown_sdata(sdata);
2013
2014	ieee80211_set_sdata_offload_flags(sdata);
2015	ret = drv_change_interface(local, sdata, internal_type, p2p);
2016	if (ret)
2017		type = ieee80211_vif_type_p2p(&sdata->vif);
2018
2019	/*
2020	 * Ignore return value here, there's not much we can do since
2021	 * the driver changed the interface type internally already.
2022	 * The warnings will hopefully make driver authors fix it :-)
2023	 */
2024	ieee80211_check_queues(sdata, type);
2025
2026	ieee80211_setup_sdata(sdata, type);
2027	ieee80211_set_vif_encap_ops(sdata);
2028
2029	err = ieee80211_do_open(&sdata->wdev, false);
2030	WARN(err, "type change: do_open returned %d", err);
2031
2032	ieee80211_wake_vif_queues(local, sdata,
2033				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
2034	return ret;
2035}
2036
2037int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
2038			     enum nl80211_iftype type)
2039{
2040	int ret;
2041
2042	ASSERT_RTNL();
2043
2044	if (type == ieee80211_vif_type_p2p(&sdata->vif))
2045		return 0;
2046
2047	if (ieee80211_sdata_running(sdata)) {
2048		ret = ieee80211_runtime_change_iftype(sdata, type);
2049		if (ret)
2050			return ret;
2051	} else {
2052		/* Purge and reset type-dependent state. */
2053		ieee80211_teardown_sdata(sdata);
2054		ieee80211_setup_sdata(sdata, type);
2055	}
2056
2057	/* reset some values that shouldn't be kept across type changes */
2058	if (type == NL80211_IFTYPE_STATION)
2059		sdata->u.mgd.use_4addr = false;
2060
2061	return 0;
2062}
2063
2064static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
2065				       u8 *perm_addr, enum nl80211_iftype type)
2066{
2067	struct ieee80211_sub_if_data *sdata;
2068	u64 mask, start, addr, val, inc;
2069	u8 *m;
2070	u8 tmp_addr[ETH_ALEN];
2071	int i;
2072
2073	lockdep_assert_wiphy(local->hw.wiphy);
2074
2075	/* default ... something at least */
2076	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
2077
2078	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
2079	    local->hw.wiphy->n_addresses <= 1)
2080		return;
2081
2082	switch (type) {
2083	case NL80211_IFTYPE_MONITOR:
2084		/* doesn't matter */
2085		break;
2086	case NL80211_IFTYPE_AP_VLAN:
2087		/* match up with an AP interface */
2088		list_for_each_entry(sdata, &local->interfaces, list) {
2089			if (sdata->vif.type != NL80211_IFTYPE_AP)
2090				continue;
2091			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2092			break;
2093		}
2094		/* keep default if no AP interface present */
2095		break;
2096	case NL80211_IFTYPE_P2P_CLIENT:
2097	case NL80211_IFTYPE_P2P_GO:
2098		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
2099			list_for_each_entry(sdata, &local->interfaces, list) {
2100				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
2101					continue;
2102				if (!ieee80211_sdata_running(sdata))
2103					continue;
2104				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2105				return;
2106			}
2107		}
2108		fallthrough;
2109	default:
2110		/* assign a new address if possible -- try n_addresses first */
2111		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2112			bool used = false;
2113
2114			list_for_each_entry(sdata, &local->interfaces, list) {
2115				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2116						     sdata->vif.addr)) {
2117					used = true;
2118					break;
2119				}
2120			}
2121
2122			if (!used) {
2123				memcpy(perm_addr,
2124				       local->hw.wiphy->addresses[i].addr,
2125				       ETH_ALEN);
2126				break;
2127			}
2128		}
2129
2130		/* try mask if available */
2131		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2132			break;
2133
2134		m = local->hw.wiphy->addr_mask;
2135		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2136			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2137			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2138
2139		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2140			/* not a contiguous mask ... not handled now! */
2141			pr_info("not contiguous\n");
2142			break;
2143		}
2144
2145		/*
2146		 * Pick address of existing interface in case user changed
2147		 * MAC address manually, default to perm_addr.
2148		 */
2149		m = local->hw.wiphy->perm_addr;
2150		list_for_each_entry(sdata, &local->interfaces, list) {
2151			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2152				continue;
2153			m = sdata->vif.addr;
2154			break;
2155		}
2156		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2157			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2158			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2159
2160		inc = 1ULL<<__ffs64(mask);
2161		val = (start & mask);
2162		addr = (start & ~mask) | (val & mask);
2163		do {
2164			bool used = false;
2165
2166			tmp_addr[5] = addr >> 0*8;
2167			tmp_addr[4] = addr >> 1*8;
2168			tmp_addr[3] = addr >> 2*8;
2169			tmp_addr[2] = addr >> 3*8;
2170			tmp_addr[1] = addr >> 4*8;
2171			tmp_addr[0] = addr >> 5*8;
2172
2173			val += inc;
2174
2175			list_for_each_entry(sdata, &local->interfaces, list) {
2176				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2177					used = true;
2178					break;
2179				}
2180			}
2181
2182			if (!used) {
2183				memcpy(perm_addr, tmp_addr, ETH_ALEN);
2184				break;
2185			}
2186			addr = (start & ~mask) | (val & mask);
2187		} while (addr != start);
2188
2189		break;
2190	}
2191}
2192
2193int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2194		     unsigned char name_assign_type,
2195		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
2196		     struct vif_params *params)
2197{
2198	struct net_device *ndev = NULL;
2199	struct ieee80211_sub_if_data *sdata = NULL;
2200	struct txq_info *txqi;
2201	int ret, i;
2202
2203	ASSERT_RTNL();
2204	lockdep_assert_wiphy(local->hw.wiphy);
2205
2206	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2207		struct wireless_dev *wdev;
2208
2209		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2210				GFP_KERNEL);
2211		if (!sdata)
2212			return -ENOMEM;
2213		wdev = &sdata->wdev;
2214
2215		sdata->dev = NULL;
2216		strscpy(sdata->name, name, IFNAMSIZ);
2217		ieee80211_assign_perm_addr(local, wdev->address, type);
2218		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2219		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2220	} else {
2221		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2222				 sizeof(void *));
2223		int txq_size = 0;
2224
2225		if (type != NL80211_IFTYPE_AP_VLAN &&
2226		    (type != NL80211_IFTYPE_MONITOR ||
2227		     (params->flags & MONITOR_FLAG_ACTIVE)))
2228			txq_size += sizeof(struct txq_info) +
2229				    local->hw.txq_data_size;
2230
2231		ndev = alloc_netdev_mqs(size + txq_size,
2232					name, name_assign_type,
2233					ieee80211_if_setup, 1, 1);
2234		if (!ndev)
2235			return -ENOMEM;
2236
2237		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2238
2239		ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2240
2241		ndev->needed_headroom = local->tx_headroom +
2242					4*6 /* four MAC addresses */
2243					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2244					+ 6 /* mesh */
2245					+ 8 /* rfc1042/bridge tunnel */
2246					- ETH_HLEN /* ethernet hard_header_len */
2247					+ IEEE80211_ENCRYPT_HEADROOM;
2248		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2249
2250		ret = dev_alloc_name(ndev, ndev->name);
2251		if (ret < 0) {
2252			free_netdev(ndev);
2253			return ret;
2254		}
2255
2256		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2257		if (is_valid_ether_addr(params->macaddr))
2258			eth_hw_addr_set(ndev, params->macaddr);
2259		else
2260			eth_hw_addr_set(ndev, ndev->perm_addr);
2261		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2262
2263		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2264		sdata = netdev_priv(ndev);
2265		ndev->ieee80211_ptr = &sdata->wdev;
2266		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2267		ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2268		memcpy(sdata->name, ndev->name, IFNAMSIZ);
2269
2270		if (txq_size) {
2271			txqi = netdev_priv(ndev) + size;
2272			ieee80211_txq_init(sdata, NULL, txqi, 0);
2273		}
2274
2275		sdata->dev = ndev;
2276	}
2277
2278	/* initialise type-independent data */
2279	sdata->wdev.wiphy = local->hw.wiphy;
2280
2281	ieee80211_sdata_init(local, sdata);
2282
2283	ieee80211_init_frag_cache(&sdata->frags);
2284
2285	wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk,
2286				ieee80211_delayed_tailroom_dec);
2287
2288	for (i = 0; i < NUM_NL80211_BANDS; i++) {
2289		struct ieee80211_supported_band *sband;
2290		sband = local->hw.wiphy->bands[i];
2291		sdata->rc_rateidx_mask[i] =
2292			sband ? (1 << sband->n_bitrates) - 1 : 0;
2293		if (sband) {
2294			__le16 cap;
2295			u16 *vht_rate_mask;
2296
2297			memcpy(sdata->rc_rateidx_mcs_mask[i],
2298			       sband->ht_cap.mcs.rx_mask,
2299			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2300
2301			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2302			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2303			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2304		} else {
2305			memset(sdata->rc_rateidx_mcs_mask[i], 0,
2306			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
2307			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2308			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2309		}
2310	}
2311
2312	ieee80211_set_default_queues(sdata);
2313
2314	/* setup type-dependent data */
2315	ieee80211_setup_sdata(sdata, type);
2316
2317	if (ndev) {
2318		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2319		if (type == NL80211_IFTYPE_STATION)
2320			sdata->u.mgd.use_4addr = params->use_4addr;
2321
2322		ndev->features |= local->hw.netdev_features;
2323		ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2324		ndev->hw_features |= ndev->features &
2325					MAC80211_SUPPORTED_FEATURES_TX;
2326		sdata->vif.netdev_features = local->hw.netdev_features;
2327
2328		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2329
2330		/* MTU range is normally 256 - 2304, where the upper limit is
2331		 * the maximum MSDU size. Monitor interfaces send and receive
2332		 * MPDU and A-MSDU frames which may be much larger so we do
2333		 * not impose an upper limit in that case.
2334		 */
2335		ndev->min_mtu = 256;
2336		if (type == NL80211_IFTYPE_MONITOR)
2337			ndev->max_mtu = 0;
2338		else
2339			ndev->max_mtu = local->hw.max_mtu;
2340
2341		ret = cfg80211_register_netdevice(ndev);
2342		if (ret) {
2343			free_netdev(ndev);
2344			return ret;
2345		}
2346	}
2347
2348	mutex_lock(&local->iflist_mtx);
2349	list_add_tail_rcu(&sdata->list, &local->interfaces);
2350	mutex_unlock(&local->iflist_mtx);
2351
2352	if (new_wdev)
2353		*new_wdev = &sdata->wdev;
2354
2355	return 0;
2356}
2357
2358void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2359{
2360	ASSERT_RTNL();
2361	lockdep_assert_wiphy(sdata->local->hw.wiphy);
2362
2363	mutex_lock(&sdata->local->iflist_mtx);
2364	list_del_rcu(&sdata->list);
2365	mutex_unlock(&sdata->local->iflist_mtx);
2366
2367	if (sdata->vif.txq)
2368		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2369
2370	synchronize_rcu();
2371
2372	cfg80211_unregister_wdev(&sdata->wdev);
2373
2374	if (!sdata->dev) {
2375		ieee80211_teardown_sdata(sdata);
2376		kfree(sdata);
2377	}
2378}
2379
2380void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2381{
2382	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2383		return;
2384	ieee80211_do_stop(sdata, true);
2385}
2386
2387void ieee80211_remove_interfaces(struct ieee80211_local *local)
2388{
2389	struct ieee80211_sub_if_data *sdata, *tmp;
2390	LIST_HEAD(unreg_list);
2391
2392	ASSERT_RTNL();
2393
2394	/* Before destroying the interfaces, make sure they're all stopped so
2395	 * that the hardware is stopped. Otherwise, the driver might still be
2396	 * iterating the interfaces during the shutdown, e.g. from a worker
2397	 * or from RX processing or similar, and if it does so (using atomic
2398	 * iteration) while we're manipulating the list, the iteration will
2399	 * crash.
2400	 *
2401	 * After this, the hardware should be stopped and the driver should
2402	 * have stopped all of its activities, so that we can do RCU-unaware
2403	 * manipulations of the interface list below.
2404	 */
2405	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2406
2407	guard(wiphy)(local->hw.wiphy);
2408
2409	WARN(local->open_count, "%s: open count remains %d\n",
2410	     wiphy_name(local->hw.wiphy), local->open_count);
2411
2412	mutex_lock(&local->iflist_mtx);
2413	list_splice_init(&local->interfaces, &unreg_list);
2414	mutex_unlock(&local->iflist_mtx);
2415
2416	list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2417		bool netdev = sdata->dev;
2418
2419		/*
2420		 * Remove IP addresses explicitly, since the notifier will
2421		 * skip the callbacks if wdev->registered is false, since
2422		 * we can't acquire the wiphy_lock() again there if already
2423		 * inside this locked section.
2424		 */
2425		sdata->vif.cfg.arp_addr_cnt = 0;
2426		if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2427		    sdata->u.mgd.associated)
2428			ieee80211_vif_cfg_change_notify(sdata,
2429							BSS_CHANGED_ARP_FILTER);
2430
2431		list_del(&sdata->list);
2432		cfg80211_unregister_wdev(&sdata->wdev);
2433
2434		if (!netdev)
2435			kfree(sdata);
2436	}
2437}
2438
2439static int netdev_notify(struct notifier_block *nb,
2440			 unsigned long state, void *ptr)
2441{
2442	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2443	struct ieee80211_sub_if_data *sdata;
2444
2445	if (state != NETDEV_CHANGENAME)
2446		return NOTIFY_DONE;
2447
2448	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2449		return NOTIFY_DONE;
2450
2451	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2452		return NOTIFY_DONE;
2453
2454	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2455	memcpy(sdata->name, dev->name, IFNAMSIZ);
2456	ieee80211_debugfs_rename_netdev(sdata);
2457
2458	return NOTIFY_OK;
2459}
2460
2461static struct notifier_block mac80211_netdev_notifier = {
2462	.notifier_call = netdev_notify,
2463};
2464
2465int ieee80211_iface_init(void)
2466{
2467	return register_netdevice_notifier(&mac80211_netdev_notifier);
2468}
2469
2470void ieee80211_iface_exit(void)
2471{
2472	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2473}
2474
2475void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2476{
2477	if (sdata->vif.type == NL80211_IFTYPE_AP)
2478		atomic_inc(&sdata->u.ap.num_mcast_sta);
2479	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2480		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2481}
2482
2483void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2484{
2485	if (sdata->vif.type == NL80211_IFTYPE_AP)
2486		atomic_dec(&sdata->u.ap.num_mcast_sta);
2487	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2488		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2489}
2490
2491void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata)
2492{
2493	struct ieee80211_local *local = sdata->local;
2494
2495	if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA))
2496		return;
2497
2498	ieee80211_stop_vif_queues_norefcount(local, sdata,
2499					     IEEE80211_QUEUE_STOP_REASON_CSA);
2500}
2501
2502void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata)
2503{
2504	struct ieee80211_local *local = sdata->local;
2505
2506	ieee80211_wake_vif_queues_norefcount(local, sdata,
2507					     IEEE80211_QUEUE_STOP_REASON_CSA);
2508}