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) 2018-2020 Intel Corporation
  12 */
  13#include <linux/slab.h>
  14#include <linux/kernel.h>
  15#include <linux/if_arp.h>
  16#include <linux/netdevice.h>
  17#include <linux/rtnetlink.h>
  18#include <net/mac80211.h>
  19#include <net/ieee80211_radiotap.h>
  20#include "ieee80211_i.h"
  21#include "sta_info.h"
  22#include "debugfs_netdev.h"
  23#include "mesh.h"
  24#include "led.h"
  25#include "driver-ops.h"
  26#include "wme.h"
  27#include "rate.h"
  28
  29/**
  30 * DOC: Interface list locking
  31 *
  32 * The interface list in each struct ieee80211_local is protected
  33 * three-fold:
  34 *
  35 * (1) modifications may only be done under the RTNL
  36 * (2) modifications and readers are protected against each other by
  37 *     the iflist_mtx.
  38 * (3) modifications are done in an RCU manner so atomic readers
  39 *     can traverse the list in RCU-safe blocks.
  40 *
  41 * As a consequence, reads (traversals) of the list can be protected
  42 * by either the RTNL, the iflist_mtx or RCU.
  43 */
  44
  45static void ieee80211_iface_work(struct work_struct *work);
  46
  47bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48{
  49	struct ieee80211_chanctx_conf *chanctx_conf;
  50	int power;
  51
  52	rcu_read_lock();
  53	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54	if (!chanctx_conf) {
  55		rcu_read_unlock();
  56		return false;
  57	}
  58
  59	power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60	rcu_read_unlock();
  61
  62	if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63		power = min(power, sdata->user_power_level);
  64
  65	if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66		power = min(power, sdata->ap_power_level);
  67
  68	if (power != sdata->vif.bss_conf.txpower) {
  69		sdata->vif.bss_conf.txpower = power;
  70		ieee80211_hw_config(sdata->local, 0);
  71		return true;
  72	}
  73
  74	return false;
  75}
  76
  77void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78			      bool update_bss)
  79{
  80	if (__ieee80211_recalc_txpower(sdata) ||
  81	    (update_bss && ieee80211_sdata_running(sdata)))
  82		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83}
  84
  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
 111	lockdep_assert_held(&local->mtx);
 112
 113	active = force_active ||
 114		 !list_empty(&local->chanctx_list) ||
 115		 local->monitors;
 116
 117	working = !local->ops->remain_on_channel &&
 118		  !list_empty(&local->roc_list);
 119
 120	scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121		   test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123	if (working || scanning)
 124		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125	else
 126		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128	if (active)
 129		led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130	else
 131		led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133	ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135	if (working || scanning || active)
 136		return __ieee80211_idle_off(local);
 137	return __ieee80211_idle_on(local);
 138}
 139
 140u32 ieee80211_idle_off(struct ieee80211_local *local)
 141{
 142	return __ieee80211_recalc_idle(local, true);
 143}
 144
 145void ieee80211_recalc_idle(struct ieee80211_local *local)
 146{
 147	u32 change = __ieee80211_recalc_idle(local, false);
 148	if (change)
 149		ieee80211_hw_config(local, change);
 150}
 151
 152static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153				bool check_dup)
 154{
 155	struct ieee80211_local *local = sdata->local;
 156	struct ieee80211_sub_if_data *iter;
 157	u64 new, mask, tmp;
 158	u8 *m;
 159	int ret = 0;
 160
 161	if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162		return 0;
 163
 164	m = addr;
 165	new =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169	m = local->hw.wiphy->addr_mask;
 170	mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171		((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172		((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174	if (!check_dup)
 175		return ret;
 176
 177	mutex_lock(&local->iflist_mtx);
 178	list_for_each_entry(iter, &local->interfaces, list) {
 179		if (iter == sdata)
 180			continue;
 181
 182		if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183		    !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184			continue;
 185
 186		m = iter->vif.addr;
 187		tmp =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191		if ((new & ~mask) != (tmp & ~mask)) {
 192			ret = -EINVAL;
 193			break;
 194		}
 195	}
 196	mutex_unlock(&local->iflist_mtx);
 197
 198	return ret;
 199}
 200
 201static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202{
 203	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204	struct sockaddr *sa = addr;
 205	bool check_dup = true;
 206	int ret;
 207
 208	if (ieee80211_sdata_running(sdata))
 209		return -EBUSY;
 210
 211	if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212	    !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213		check_dup = false;
 214
 215	ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216	if (ret)
 217		return ret;
 218
 219	ret = eth_mac_addr(dev, sa);
 220
 221	if (ret == 0)
 222		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224	return ret;
 225}
 226
 227static inline int identical_mac_addr_allowed(int type1, int type2)
 228{
 229	return type1 == NL80211_IFTYPE_MONITOR ||
 230		type2 == NL80211_IFTYPE_MONITOR ||
 231		type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232		type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 234		(type1 == NL80211_IFTYPE_WDS &&
 235			(type2 == NL80211_IFTYPE_WDS ||
 236			 type2 == NL80211_IFTYPE_AP)) ||
 237		(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 238		(type1 == NL80211_IFTYPE_AP_VLAN &&
 239			(type2 == NL80211_IFTYPE_AP ||
 240			 type2 == NL80211_IFTYPE_AP_VLAN));
 241}
 242
 243static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 244					    enum nl80211_iftype iftype)
 245{
 246	struct ieee80211_local *local = sdata->local;
 247	struct ieee80211_sub_if_data *nsdata;
 248	int ret;
 249
 250	ASSERT_RTNL();
 251
 252	/* we hold the RTNL here so can safely walk the list */
 253	list_for_each_entry(nsdata, &local->interfaces, list) {
 254		if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255			/*
 256			 * Only OCB and monitor mode may coexist
 257			 */
 258			if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 259			     nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 260			    (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 261			     nsdata->vif.type == NL80211_IFTYPE_OCB))
 262				return -EBUSY;
 263
 264			/*
 265			 * Allow only a single IBSS interface to be up at any
 266			 * time. This is restricted because beacon distribution
 267			 * cannot work properly if both are in the same IBSS.
 268			 *
 269			 * To remove this restriction we'd have to disallow them
 270			 * from setting the same SSID on different IBSS interfaces
 271			 * belonging to the same hardware. Then, however, we're
 272			 * faced with having to adopt two different TSF timers...
 273			 */
 274			if (iftype == NL80211_IFTYPE_ADHOC &&
 275			    nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276				return -EBUSY;
 277			/*
 278			 * will not add another interface while any channel
 279			 * switch is active.
 280			 */
 281			if (nsdata->vif.csa_active)
 282				return -EBUSY;
 283
 284			/*
 285			 * The remaining checks are only performed for interfaces
 286			 * with the same MAC address.
 287			 */
 288			if (!ether_addr_equal(sdata->vif.addr,
 289					      nsdata->vif.addr))
 290				continue;
 291
 292			/*
 293			 * check whether it may have the same address
 294			 */
 295			if (!identical_mac_addr_allowed(iftype,
 296							nsdata->vif.type))
 297				return -ENOTUNIQ;
 298
 299			/*
 300			 * can only add VLANs to enabled APs
 301			 */
 302			if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303			    nsdata->vif.type == NL80211_IFTYPE_AP)
 304				sdata->bss = &nsdata->u.ap;
 305		}
 306	}
 307
 308	mutex_lock(&local->chanctx_mtx);
 309	ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 310	mutex_unlock(&local->chanctx_mtx);
 311	return ret;
 312}
 313
 314static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 315				  enum nl80211_iftype iftype)
 316{
 317	int n_queues = sdata->local->hw.queues;
 318	int i;
 319
 320	if (iftype == NL80211_IFTYPE_NAN)
 321		return 0;
 322
 323	if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 324		for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 325			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 326					 IEEE80211_INVAL_HW_QUEUE))
 327				return -EINVAL;
 328			if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 329					 n_queues))
 330				return -EINVAL;
 331		}
 332	}
 333
 334	if ((iftype != NL80211_IFTYPE_AP &&
 335	     iftype != NL80211_IFTYPE_P2P_GO &&
 336	     iftype != NL80211_IFTYPE_MESH_POINT) ||
 337	    !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 338		sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 339		return 0;
 340	}
 341
 342	if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 343		return -EINVAL;
 344
 345	if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 346		return -EINVAL;
 347
 348	return 0;
 349}
 350
 351void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 352				    const int offset)
 353{
 354	struct ieee80211_local *local = sdata->local;
 355	u32 flags = sdata->u.mntr.flags;
 356
 357#define ADJUST(_f, _s)	do {					\
 358	if (flags & MONITOR_FLAG_##_f)				\
 359		local->fif_##_s += offset;			\
 360	} while (0)
 361
 362	ADJUST(FCSFAIL, fcsfail);
 363	ADJUST(PLCPFAIL, plcpfail);
 364	ADJUST(CONTROL, control);
 365	ADJUST(CONTROL, pspoll);
 366	ADJUST(OTHER_BSS, other_bss);
 367
 368#undef ADJUST
 369}
 370
 371static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 372{
 373	struct ieee80211_local *local = sdata->local;
 374	int i;
 375
 376	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 377		if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 378			sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 379		else if (local->hw.queues >= IEEE80211_NUM_ACS)
 380			sdata->vif.hw_queue[i] = i;
 381		else
 382			sdata->vif.hw_queue[i] = 0;
 383	}
 384	sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 385}
 386
 387int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 388{
 389	struct ieee80211_sub_if_data *sdata;
 390	int ret;
 391
 392	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 393		return 0;
 394
 395	ASSERT_RTNL();
 396
 397	if (local->monitor_sdata)
 398		return 0;
 399
 400	sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 401	if (!sdata)
 402		return -ENOMEM;
 403
 404	/* set up data */
 405	sdata->local = local;
 406	sdata->vif.type = NL80211_IFTYPE_MONITOR;
 407	snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 408		 wiphy_name(local->hw.wiphy));
 409	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 410
 411	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 412
 413	ieee80211_set_default_queues(sdata);
 414
 415	ret = drv_add_interface(local, sdata);
 416	if (WARN_ON(ret)) {
 417		/* ok .. stupid driver, it asked for this! */
 418		kfree(sdata);
 419		return ret;
 420	}
 421
 422	ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 423	if (ret) {
 424		kfree(sdata);
 425		return ret;
 426	}
 427
 428	mutex_lock(&local->iflist_mtx);
 429	rcu_assign_pointer(local->monitor_sdata, sdata);
 430	mutex_unlock(&local->iflist_mtx);
 431
 432	mutex_lock(&local->mtx);
 433	ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 434					IEEE80211_CHANCTX_EXCLUSIVE);
 435	mutex_unlock(&local->mtx);
 436	if (ret) {
 437		mutex_lock(&local->iflist_mtx);
 438		RCU_INIT_POINTER(local->monitor_sdata, NULL);
 439		mutex_unlock(&local->iflist_mtx);
 440		synchronize_net();
 441		drv_remove_interface(local, sdata);
 442		kfree(sdata);
 443		return ret;
 444	}
 445
 446	skb_queue_head_init(&sdata->skb_queue);
 447	INIT_WORK(&sdata->work, ieee80211_iface_work);
 448
 449	return 0;
 450}
 451
 452void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 453{
 454	struct ieee80211_sub_if_data *sdata;
 455
 456	if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 457		return;
 458
 459	ASSERT_RTNL();
 460
 461	mutex_lock(&local->iflist_mtx);
 462
 463	sdata = rcu_dereference_protected(local->monitor_sdata,
 464					  lockdep_is_held(&local->iflist_mtx));
 465	if (!sdata) {
 466		mutex_unlock(&local->iflist_mtx);
 467		return;
 468	}
 469
 470	RCU_INIT_POINTER(local->monitor_sdata, NULL);
 471	mutex_unlock(&local->iflist_mtx);
 472
 473	synchronize_net();
 474
 475	mutex_lock(&local->mtx);
 476	ieee80211_vif_release_channel(sdata);
 477	mutex_unlock(&local->mtx);
 478
 479	drv_remove_interface(local, sdata);
 480
 481	kfree(sdata);
 482}
 483
 484/*
 485 * NOTE: Be very careful when changing this function, it must NOT return
 486 * an error on interface type changes that have been pre-checked, so most
 487 * checks should be in ieee80211_check_concurrent_iface.
 488 */
 489int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 490{
 491	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 492	struct net_device *dev = wdev->netdev;
 493	struct ieee80211_local *local = sdata->local;
 494	struct sta_info *sta;
 495	u32 changed = 0;
 496	int res;
 497	u32 hw_reconf_flags = 0;
 498
 499	switch (sdata->vif.type) {
 500	case NL80211_IFTYPE_WDS:
 501		if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 502			return -ENOLINK;
 503		break;
 504	case NL80211_IFTYPE_AP_VLAN: {
 505		struct ieee80211_sub_if_data *master;
 506
 507		if (!sdata->bss)
 508			return -ENOLINK;
 509
 510		mutex_lock(&local->mtx);
 511		list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 512		mutex_unlock(&local->mtx);
 513
 514		master = container_of(sdata->bss,
 515				      struct ieee80211_sub_if_data, u.ap);
 516		sdata->control_port_protocol =
 517			master->control_port_protocol;
 518		sdata->control_port_no_encrypt =
 519			master->control_port_no_encrypt;
 520		sdata->control_port_over_nl80211 =
 521			master->control_port_over_nl80211;
 522		sdata->control_port_no_preauth =
 523			master->control_port_no_preauth;
 524		sdata->vif.cab_queue = master->vif.cab_queue;
 525		memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 526		       sizeof(sdata->vif.hw_queue));
 527		sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 528
 529		mutex_lock(&local->key_mtx);
 530		sdata->crypto_tx_tailroom_needed_cnt +=
 531			master->crypto_tx_tailroom_needed_cnt;
 532		mutex_unlock(&local->key_mtx);
 533
 534		break;
 535		}
 536	case NL80211_IFTYPE_AP:
 537		sdata->bss = &sdata->u.ap;
 538		break;
 539	case NL80211_IFTYPE_MESH_POINT:
 540	case NL80211_IFTYPE_STATION:
 541	case NL80211_IFTYPE_MONITOR:
 542	case NL80211_IFTYPE_ADHOC:
 543	case NL80211_IFTYPE_P2P_DEVICE:
 544	case NL80211_IFTYPE_OCB:
 545	case NL80211_IFTYPE_NAN:
 546		/* no special treatment */
 547		break;
 548	case NL80211_IFTYPE_UNSPECIFIED:
 549	case NUM_NL80211_IFTYPES:
 550	case NL80211_IFTYPE_P2P_CLIENT:
 551	case NL80211_IFTYPE_P2P_GO:
 552		/* cannot happen */
 553		WARN_ON(1);
 554		break;
 555	}
 556
 557	if (local->open_count == 0) {
 558		res = drv_start(local);
 559		if (res)
 560			goto err_del_bss;
 561		/* we're brought up, everything changes */
 562		hw_reconf_flags = ~0;
 563		ieee80211_led_radio(local, true);
 564		ieee80211_mod_tpt_led_trig(local,
 565					   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 566	}
 567
 568	/*
 569	 * Copy the hopefully now-present MAC address to
 570	 * this interface, if it has the special null one.
 571	 */
 572	if (dev && is_zero_ether_addr(dev->dev_addr)) {
 573		memcpy(dev->dev_addr,
 574		       local->hw.wiphy->perm_addr,
 575		       ETH_ALEN);
 576		memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 577
 578		if (!is_valid_ether_addr(dev->dev_addr)) {
 579			res = -EADDRNOTAVAIL;
 580			goto err_stop;
 581		}
 582	}
 583
 584	switch (sdata->vif.type) {
 585	case NL80211_IFTYPE_AP_VLAN:
 586		/* no need to tell driver, but set carrier and chanctx */
 587		if (rtnl_dereference(sdata->bss->beacon)) {
 588			ieee80211_vif_vlan_copy_chanctx(sdata);
 589			netif_carrier_on(dev);
 590		} else {
 591			netif_carrier_off(dev);
 592		}
 593		break;
 594	case NL80211_IFTYPE_MONITOR:
 595		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 596			local->cooked_mntrs++;
 597			break;
 598		}
 599
 600		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 601			res = drv_add_interface(local, sdata);
 602			if (res)
 603				goto err_stop;
 604		} else if (local->monitors == 0 && local->open_count == 0) {
 605			res = ieee80211_add_virtual_monitor(local);
 606			if (res)
 607				goto err_stop;
 608		}
 609
 610		/* must be before the call to ieee80211_configure_filter */
 611		local->monitors++;
 612		if (local->monitors == 1) {
 613			local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 614			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 615		}
 616
 617		ieee80211_adjust_monitor_flags(sdata, 1);
 618		ieee80211_configure_filter(local);
 619		mutex_lock(&local->mtx);
 620		ieee80211_recalc_idle(local);
 621		mutex_unlock(&local->mtx);
 622
 623		netif_carrier_on(dev);
 624		break;
 625	default:
 626		if (coming_up) {
 627			ieee80211_del_virtual_monitor(local);
 628
 629			res = drv_add_interface(local, sdata);
 630			if (res)
 631				goto err_stop;
 632			res = ieee80211_check_queues(sdata,
 633				ieee80211_vif_type_p2p(&sdata->vif));
 634			if (res)
 635				goto err_del_interface;
 636		}
 637
 638		if (sdata->vif.type == NL80211_IFTYPE_AP) {
 639			local->fif_pspoll++;
 640			local->fif_probe_req++;
 641
 642			ieee80211_configure_filter(local);
 643		} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 644			local->fif_probe_req++;
 645		}
 646
 647		if (sdata->vif.probe_req_reg)
 648			drv_config_iface_filter(local, sdata,
 649						FIF_PROBE_REQ,
 650						FIF_PROBE_REQ);
 651
 652		if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 653		    sdata->vif.type != NL80211_IFTYPE_NAN)
 654			changed |= ieee80211_reset_erp_info(sdata);
 655		ieee80211_bss_info_change_notify(sdata, changed);
 656
 657		switch (sdata->vif.type) {
 658		case NL80211_IFTYPE_STATION:
 659		case NL80211_IFTYPE_ADHOC:
 660		case NL80211_IFTYPE_AP:
 661		case NL80211_IFTYPE_MESH_POINT:
 662		case NL80211_IFTYPE_OCB:
 663			netif_carrier_off(dev);
 664			break;
 665		case NL80211_IFTYPE_WDS:
 666		case NL80211_IFTYPE_P2P_DEVICE:
 667		case NL80211_IFTYPE_NAN:
 668			break;
 669		default:
 670			/* not reached */
 671			WARN_ON(1);
 672		}
 673
 674		/*
 675		 * Set default queue parameters so drivers don't
 676		 * need to initialise the hardware if the hardware
 677		 * doesn't start up with sane defaults.
 678		 * Enable QoS for anything but station interfaces.
 679		 */
 680		ieee80211_set_wmm_default(sdata, true,
 681			sdata->vif.type != NL80211_IFTYPE_STATION);
 682	}
 683
 684	set_bit(SDATA_STATE_RUNNING, &sdata->state);
 685
 686	switch (sdata->vif.type) {
 687	case NL80211_IFTYPE_WDS:
 688		/* Create STA entry for the WDS peer */
 689		sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 690				     GFP_KERNEL);
 691		if (!sta) {
 692			res = -ENOMEM;
 693			goto err_del_interface;
 694		}
 695
 696		sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 697		sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 698		sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 699
 700		res = sta_info_insert(sta);
 701		if (res) {
 702			/* STA has been freed */
 703			goto err_del_interface;
 704		}
 705
 706		rate_control_rate_init(sta);
 707		netif_carrier_on(dev);
 708		break;
 709	case NL80211_IFTYPE_P2P_DEVICE:
 710		rcu_assign_pointer(local->p2p_sdata, sdata);
 711		break;
 712	case NL80211_IFTYPE_MONITOR:
 713		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 714			break;
 715		list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 716		break;
 717	default:
 718		break;
 719	}
 720
 721	/*
 722	 * set_multicast_list will be invoked by the networking core
 723	 * which will check whether any increments here were done in
 724	 * error and sync them down to the hardware as filter flags.
 725	 */
 726	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 727		atomic_inc(&local->iff_allmultis);
 728
 729	if (coming_up)
 730		local->open_count++;
 731
 732	if (hw_reconf_flags)
 733		ieee80211_hw_config(local, hw_reconf_flags);
 734
 735	ieee80211_recalc_ps(local);
 736
 737	if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 738	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 739	    local->ops->wake_tx_queue) {
 740		/* XXX: for AP_VLAN, actually track AP queues */
 741		if (dev)
 742			netif_tx_start_all_queues(dev);
 743	} else if (dev) {
 744		unsigned long flags;
 745		int n_acs = IEEE80211_NUM_ACS;
 746		int ac;
 747
 748		if (local->hw.queues < IEEE80211_NUM_ACS)
 749			n_acs = 1;
 750
 751		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 752		if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 753		    (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 754		     skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 755			for (ac = 0; ac < n_acs; ac++) {
 756				int ac_queue = sdata->vif.hw_queue[ac];
 757
 758				if (local->queue_stop_reasons[ac_queue] == 0 &&
 759				    skb_queue_empty(&local->pending[ac_queue]))
 760					netif_start_subqueue(dev, ac);
 761			}
 762		}
 763		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 764	}
 765
 766	return 0;
 767 err_del_interface:
 768	drv_remove_interface(local, sdata);
 769 err_stop:
 770	if (!local->open_count)
 771		drv_stop(local);
 772 err_del_bss:
 773	sdata->bss = NULL;
 774	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 775		mutex_lock(&local->mtx);
 776		list_del(&sdata->u.vlan.list);
 777		mutex_unlock(&local->mtx);
 778	}
 779	/* might already be clear but that doesn't matter */
 780	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 781	return res;
 782}
 783
 784static int ieee80211_open(struct net_device *dev)
 785{
 786	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 787	int err;
 788
 789	/* fail early if user set an invalid address */
 790	if (!is_valid_ether_addr(dev->dev_addr))
 791		return -EADDRNOTAVAIL;
 792
 793	err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 794	if (err)
 795		return err;
 796
 797	return ieee80211_do_open(&sdata->wdev, true);
 798}
 799
 800static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 801			      bool going_down)
 802{
 803	struct ieee80211_local *local = sdata->local;
 804	unsigned long flags;
 805	struct sk_buff *skb, *tmp;
 806	u32 hw_reconf_flags = 0;
 807	int i, flushed;
 808	struct ps_data *ps;
 809	struct cfg80211_chan_def chandef;
 810	bool cancel_scan;
 811	struct cfg80211_nan_func *func;
 812
 813	clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 814
 815	cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 816	if (cancel_scan)
 817		ieee80211_scan_cancel(local);
 818
 819	/*
 820	 * Stop TX on this interface first.
 821	 */
 822	if (sdata->dev)
 823		netif_tx_stop_all_queues(sdata->dev);
 824
 825	ieee80211_roc_purge(local, sdata);
 826
 827	switch (sdata->vif.type) {
 828	case NL80211_IFTYPE_STATION:
 829		ieee80211_mgd_stop(sdata);
 830		break;
 831	case NL80211_IFTYPE_ADHOC:
 832		ieee80211_ibss_stop(sdata);
 833		break;
 
 
 
 834	case NL80211_IFTYPE_MONITOR:
 835		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 836			break;
 837		list_del_rcu(&sdata->u.mntr.list);
 838		break;
 839	default:
 840		break;
 841	}
 842
 843	/*
 844	 * Remove all stations associated with this interface.
 845	 *
 846	 * This must be done before calling ops->remove_interface()
 847	 * because otherwise we can later invoke ops->sta_notify()
 848	 * whenever the STAs are removed, and that invalidates driver
 849	 * assumptions about always getting a vif pointer that is valid
 850	 * (because if we remove a STA after ops->remove_interface()
 851	 * the driver will have removed the vif info already!)
 852	 *
 853	 * In WDS mode a station must exist here and be flushed, for
 854	 * AP_VLANs stations may exist since there's nothing else that
 855	 * would have removed them, but in other modes there shouldn't
 856	 * be any stations.
 857	 */
 858	flushed = sta_info_flush(sdata);
 859	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 860		     ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 861		      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 862
 863	/* don't count this interface for allmulti while it is down */
 864	if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 865		atomic_dec(&local->iff_allmultis);
 866
 867	if (sdata->vif.type == NL80211_IFTYPE_AP) {
 868		local->fif_pspoll--;
 869		local->fif_probe_req--;
 870	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 871		local->fif_probe_req--;
 872	}
 873
 874	if (sdata->dev) {
 875		netif_addr_lock_bh(sdata->dev);
 876		spin_lock_bh(&local->filter_lock);
 877		__hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 878				 sdata->dev->addr_len);
 879		spin_unlock_bh(&local->filter_lock);
 880		netif_addr_unlock_bh(sdata->dev);
 881	}
 882
 883	del_timer_sync(&local->dynamic_ps_timer);
 884	cancel_work_sync(&local->dynamic_ps_enable_work);
 885
 886	cancel_work_sync(&sdata->recalc_smps);
 887	sdata_lock(sdata);
 888	mutex_lock(&local->mtx);
 889	sdata->vif.csa_active = false;
 890	if (sdata->vif.type == NL80211_IFTYPE_STATION)
 891		sdata->u.mgd.csa_waiting_bcn = false;
 892	if (sdata->csa_block_tx) {
 893		ieee80211_wake_vif_queues(local, sdata,
 894					  IEEE80211_QUEUE_STOP_REASON_CSA);
 895		sdata->csa_block_tx = false;
 896	}
 897	mutex_unlock(&local->mtx);
 898	sdata_unlock(sdata);
 899
 900	cancel_work_sync(&sdata->csa_finalize_work);
 901
 902	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 903
 904	if (sdata->wdev.cac_started) {
 905		chandef = sdata->vif.bss_conf.chandef;
 906		WARN_ON(local->suspended);
 907		mutex_lock(&local->mtx);
 908		ieee80211_vif_release_channel(sdata);
 909		mutex_unlock(&local->mtx);
 910		cfg80211_cac_event(sdata->dev, &chandef,
 911				   NL80211_RADAR_CAC_ABORTED,
 912				   GFP_KERNEL);
 913	}
 914
 915	/* APs need special treatment */
 916	if (sdata->vif.type == NL80211_IFTYPE_AP) {
 917		struct ieee80211_sub_if_data *vlan, *tmpsdata;
 918
 919		/* down all dependent devices, that is VLANs */
 920		list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 921					 u.vlan.list)
 922			dev_close(vlan->dev);
 923		WARN_ON(!list_empty(&sdata->u.ap.vlans));
 924	} else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 925		/* remove all packets in parent bc_buf pointing to this dev */
 926		ps = &sdata->bss->ps;
 927
 928		spin_lock_irqsave(&ps->bc_buf.lock, flags);
 929		skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 930			if (skb->dev == sdata->dev) {
 931				__skb_unlink(skb, &ps->bc_buf);
 932				local->total_ps_buffered--;
 933				ieee80211_free_txskb(&local->hw, skb);
 934			}
 935		}
 936		spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 937	}
 938
 939	if (going_down)
 940		local->open_count--;
 941
 942	switch (sdata->vif.type) {
 943	case NL80211_IFTYPE_AP_VLAN:
 944		mutex_lock(&local->mtx);
 945		list_del(&sdata->u.vlan.list);
 946		mutex_unlock(&local->mtx);
 947		RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 948		/* see comment in the default case below */
 949		ieee80211_free_keys(sdata, true);
 950		/* no need to tell driver */
 951		break;
 952	case NL80211_IFTYPE_MONITOR:
 953		if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 954			local->cooked_mntrs--;
 955			break;
 956		}
 957
 958		local->monitors--;
 959		if (local->monitors == 0) {
 960			local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 961			hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 962		}
 963
 964		ieee80211_adjust_monitor_flags(sdata, -1);
 965		break;
 966	case NL80211_IFTYPE_NAN:
 967		/* clean all the functions */
 968		spin_lock_bh(&sdata->u.nan.func_lock);
 969
 970		idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 971			idr_remove(&sdata->u.nan.function_inst_ids, i);
 972			cfg80211_free_nan_func(func);
 973		}
 974		idr_destroy(&sdata->u.nan.function_inst_ids);
 975
 976		spin_unlock_bh(&sdata->u.nan.func_lock);
 977		break;
 978	case NL80211_IFTYPE_P2P_DEVICE:
 979		/* relies on synchronize_rcu() below */
 980		RCU_INIT_POINTER(local->p2p_sdata, NULL);
 981		fallthrough;
 982	default:
 983		cancel_work_sync(&sdata->work);
 984		/*
 985		 * When we get here, the interface is marked down.
 986		 * Free the remaining keys, if there are any
 987		 * (which can happen in AP mode if userspace sets
 988		 * keys before the interface is operating, and maybe
 989		 * also in WDS mode)
 990		 *
 991		 * Force the key freeing to always synchronize_net()
 992		 * to wait for the RX path in case it is using this
 993		 * interface enqueuing frames at this very time on
 994		 * another CPU.
 995		 */
 996		ieee80211_free_keys(sdata, true);
 997		skb_queue_purge(&sdata->skb_queue);
 998	}
 999
1000	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1001	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1002		skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1003			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1004			if (info->control.vif == &sdata->vif) {
1005				__skb_unlink(skb, &local->pending[i]);
1006				ieee80211_free_txskb(&local->hw, skb);
1007			}
1008		}
1009	}
1010	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1011
1012	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1013		ieee80211_txq_remove_vlan(local, sdata);
1014
1015	sdata->bss = NULL;
1016
1017	if (local->open_count == 0)
1018		ieee80211_clear_tx_pending(local);
1019
1020	sdata->vif.bss_conf.beacon_int = 0;
1021
1022	/*
1023	 * If the interface goes down while suspended, presumably because
1024	 * the device was unplugged and that happens before our resume,
1025	 * then the driver is already unconfigured and the remainder of
1026	 * this function isn't needed.
1027	 * XXX: what about WoWLAN? If the device has software state, e.g.
1028	 *	memory allocated, it might expect teardown commands from
1029	 *	mac80211 here?
1030	 */
1031	if (local->suspended) {
1032		WARN_ON(local->wowlan);
1033		WARN_ON(rtnl_dereference(local->monitor_sdata));
1034		return;
1035	}
1036
1037	switch (sdata->vif.type) {
1038	case NL80211_IFTYPE_AP_VLAN:
1039		break;
1040	case NL80211_IFTYPE_MONITOR:
1041		if (local->monitors == 0)
1042			ieee80211_del_virtual_monitor(local);
1043
1044		mutex_lock(&local->mtx);
1045		ieee80211_recalc_idle(local);
1046		mutex_unlock(&local->mtx);
1047
1048		if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1049			break;
1050
1051		fallthrough;
1052	default:
1053		if (going_down)
1054			drv_remove_interface(local, sdata);
1055	}
1056
1057	ieee80211_recalc_ps(local);
1058
1059	if (cancel_scan)
1060		flush_delayed_work(&local->scan_work);
1061
1062	if (local->open_count == 0) {
1063		ieee80211_stop_device(local);
1064
1065		/* no reconfiguring after stop! */
1066		return;
1067	}
1068
1069	/* do after stop to avoid reconfiguring when we stop anyway */
1070	ieee80211_configure_filter(local);
1071	ieee80211_hw_config(local, hw_reconf_flags);
1072
1073	if (local->monitors == local->open_count)
1074		ieee80211_add_virtual_monitor(local);
1075}
1076
1077static int ieee80211_stop(struct net_device *dev)
1078{
1079	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080
1081	ieee80211_do_stop(sdata, true);
1082
1083	return 0;
1084}
1085
1086static void ieee80211_set_multicast_list(struct net_device *dev)
1087{
1088	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1089	struct ieee80211_local *local = sdata->local;
1090	int allmulti, sdata_allmulti;
1091
1092	allmulti = !!(dev->flags & IFF_ALLMULTI);
1093	sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1094
1095	if (allmulti != sdata_allmulti) {
1096		if (dev->flags & IFF_ALLMULTI)
1097			atomic_inc(&local->iff_allmultis);
1098		else
1099			atomic_dec(&local->iff_allmultis);
1100		sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1101	}
1102
1103	spin_lock_bh(&local->filter_lock);
1104	__hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1105	spin_unlock_bh(&local->filter_lock);
1106	ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1107}
1108
1109/*
1110 * Called when the netdev is removed or, by the code below, before
1111 * the interface type changes.
1112 */
1113static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1114{
1115	int i;
1116
1117	/* free extra data */
1118	ieee80211_free_keys(sdata, false);
1119
1120	ieee80211_debugfs_remove_netdev(sdata);
1121
1122	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1123		__skb_queue_purge(&sdata->fragments[i].skb_list);
1124	sdata->fragment_next = 0;
1125
1126	if (ieee80211_vif_is_mesh(&sdata->vif))
1127		ieee80211_mesh_teardown_sdata(sdata);
1128}
1129
1130static void ieee80211_uninit(struct net_device *dev)
1131{
1132	ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1133}
1134
1135static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1136					 struct sk_buff *skb,
1137					 struct net_device *sb_dev)
1138{
1139	return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1140}
1141
1142static void
1143ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1144{
1145	int i;
1146
1147	for_each_possible_cpu(i) {
1148		const struct pcpu_sw_netstats *tstats;
1149		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150		unsigned int start;
1151
1152		tstats = per_cpu_ptr(dev->tstats, i);
1153
1154		do {
1155			start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156			rx_packets = tstats->rx_packets;
1157			tx_packets = tstats->tx_packets;
1158			rx_bytes = tstats->rx_bytes;
1159			tx_bytes = tstats->tx_bytes;
1160		} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1161
1162		stats->rx_packets += rx_packets;
1163		stats->tx_packets += tx_packets;
1164		stats->rx_bytes   += rx_bytes;
1165		stats->tx_bytes   += tx_bytes;
1166	}
1167}
1168
1169static const struct net_device_ops ieee80211_dataif_ops = {
1170	.ndo_open		= ieee80211_open,
1171	.ndo_stop		= ieee80211_stop,
1172	.ndo_uninit		= ieee80211_uninit,
1173	.ndo_start_xmit		= ieee80211_subif_start_xmit,
1174	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1175	.ndo_set_mac_address 	= ieee80211_change_mac,
1176	.ndo_select_queue	= ieee80211_netdev_select_queue,
1177	.ndo_get_stats64	= ieee80211_get_stats64,
1178};
1179
1180static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181					  struct sk_buff *skb,
1182					  struct net_device *sb_dev)
1183{
1184	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1185	struct ieee80211_local *local = sdata->local;
1186	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187	struct ieee80211_hdr *hdr;
1188	int len_rthdr;
1189
1190	if (local->hw.queues < IEEE80211_NUM_ACS)
1191		return 0;
1192
1193	/* reset flags and info before parsing radiotap header */
1194	memset(info, 0, sizeof(*info));
1195
1196	if (!ieee80211_parse_tx_radiotap(skb, dev))
1197		return 0; /* doesn't matter, frame will be dropped */
1198
1199	len_rthdr = ieee80211_get_radiotap_len(skb->data);
1200	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1201	if (skb->len < len_rthdr + 2 ||
1202	    skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
1203		return 0; /* doesn't matter, frame will be dropped */
1204
1205	return ieee80211_select_queue_80211(sdata, skb, hdr);
1206}
1207
1208static const struct net_device_ops ieee80211_monitorif_ops = {
1209	.ndo_open		= ieee80211_open,
1210	.ndo_stop		= ieee80211_stop,
1211	.ndo_uninit		= ieee80211_uninit,
1212	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
1213	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1214	.ndo_set_mac_address 	= ieee80211_change_mac,
1215	.ndo_select_queue	= ieee80211_monitor_select_queue,
1216	.ndo_get_stats64	= ieee80211_get_stats64,
1217};
1218
1219static const struct net_device_ops ieee80211_dataif_8023_ops = {
1220	.ndo_open		= ieee80211_open,
1221	.ndo_stop		= ieee80211_stop,
1222	.ndo_uninit		= ieee80211_uninit,
1223	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
1224	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
1225	.ndo_set_mac_address	= ieee80211_change_mac,
1226	.ndo_select_queue	= ieee80211_netdev_select_queue,
1227	.ndo_get_stats64	= ieee80211_get_stats64,
1228};
1229
1230static void __ieee80211_set_hw_80211_encap(struct ieee80211_sub_if_data *sdata,
1231					   bool enable)
1232{
1233	sdata->dev->netdev_ops = enable ? &ieee80211_dataif_8023_ops :
1234					  &ieee80211_dataif_ops;
1235	sdata->hw_80211_encap = enable;
1236}
1237
1238bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
1239{
1240	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1241	struct ieee80211_local *local = sdata->local;
1242	struct ieee80211_sub_if_data *iter;
1243	struct ieee80211_key *key;
1244
1245	mutex_lock(&local->iflist_mtx);
1246	list_for_each_entry(iter, &local->interfaces, list) {
1247		struct ieee80211_sub_if_data *disable = NULL;
1248
1249		if (vif->type == NL80211_IFTYPE_MONITOR) {
1250			disable = iter;
1251			__ieee80211_set_hw_80211_encap(iter, false);
1252		} else if (iter->vif.type == NL80211_IFTYPE_MONITOR) {
1253			disable = sdata;
1254			enable = false;
1255		}
1256		if (disable)
1257			sdata_dbg(disable,
1258				  "disable hw 80211 encap due to mon co-exist\n");
1259	}
1260	mutex_unlock(&local->iflist_mtx);
1261
1262	if (enable == sdata->hw_80211_encap)
1263		return enable;
1264
1265	if (!sdata->dev)
1266		return false;
1267
1268	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1269	    (local->hw.wiphy->frag_threshold != (u32)-1))
1270		enable = false;
1271
1272	mutex_lock(&sdata->local->key_mtx);
1273	list_for_each_entry(key, &sdata->key_list, list) {
1274		if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
1275			enable = false;
1276	}
1277	mutex_unlock(&sdata->local->key_mtx);
1278
1279	__ieee80211_set_hw_80211_encap(sdata, enable);
1280
1281	return enable;
1282}
1283EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
1284
1285static void ieee80211_if_free(struct net_device *dev)
1286{
1287	free_percpu(dev->tstats);
1288}
1289
1290static void ieee80211_if_setup(struct net_device *dev)
1291{
1292	ether_setup(dev);
1293	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1294	dev->netdev_ops = &ieee80211_dataif_ops;
1295	dev->needs_free_netdev = true;
1296	dev->priv_destructor = ieee80211_if_free;
1297}
1298
1299static void ieee80211_if_setup_no_queue(struct net_device *dev)
1300{
1301	ieee80211_if_setup(dev);
1302	dev->priv_flags |= IFF_NO_QUEUE;
1303}
1304
1305static void ieee80211_iface_work(struct work_struct *work)
1306{
1307	struct ieee80211_sub_if_data *sdata =
1308		container_of(work, struct ieee80211_sub_if_data, work);
1309	struct ieee80211_local *local = sdata->local;
1310	struct sk_buff *skb;
1311	struct sta_info *sta;
1312
1313	if (!ieee80211_sdata_running(sdata))
1314		return;
1315
1316	if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1317		return;
1318
1319	if (!ieee80211_can_run_worker(local))
1320		return;
1321
1322	/* first process frames */
1323	while ((skb = skb_dequeue(&sdata->skb_queue))) {
1324		struct ieee80211_mgmt *mgmt = (void *)skb->data;
1325
1326		if (ieee80211_is_action(mgmt->frame_control) &&
1327		    mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1328			int len = skb->len;
1329
1330			mutex_lock(&local->sta_mtx);
1331			sta = sta_info_get_bss(sdata, mgmt->sa);
1332			if (sta) {
1333				switch (mgmt->u.action.u.addba_req.action_code) {
1334				case WLAN_ACTION_ADDBA_REQ:
1335					ieee80211_process_addba_request(
1336							local, sta, mgmt, len);
1337					break;
1338				case WLAN_ACTION_ADDBA_RESP:
1339					ieee80211_process_addba_resp(local, sta,
1340								     mgmt, len);
1341					break;
1342				case WLAN_ACTION_DELBA:
1343					ieee80211_process_delba(sdata, sta,
1344								mgmt, len);
1345					break;
1346				default:
1347					WARN_ON(1);
1348					break;
1349				}
1350			}
1351			mutex_unlock(&local->sta_mtx);
1352		} else if (ieee80211_is_action(mgmt->frame_control) &&
1353			   mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1354			switch (mgmt->u.action.u.vht_group_notif.action_code) {
1355			case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1356				struct ieee80211_rx_status *status;
1357				enum nl80211_band band;
1358				u8 opmode;
1359
1360				status = IEEE80211_SKB_RXCB(skb);
1361				band = status->band;
1362				opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1363
1364				mutex_lock(&local->sta_mtx);
1365				sta = sta_info_get_bss(sdata, mgmt->sa);
1366
1367				if (sta)
1368					ieee80211_vht_handle_opmode(sdata, sta,
1369								    opmode,
1370								    band);
1371
1372				mutex_unlock(&local->sta_mtx);
1373				break;
1374			}
1375			case WLAN_VHT_ACTION_GROUPID_MGMT:
1376				ieee80211_process_mu_groups(sdata, mgmt);
1377				break;
1378			default:
1379				WARN_ON(1);
1380				break;
1381			}
1382		} else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1383			struct ieee80211_hdr *hdr = (void *)mgmt;
1384			/*
1385			 * So the frame isn't mgmt, but frame_control
1386			 * is at the right place anyway, of course, so
1387			 * the if statement is correct.
1388			 *
1389			 * Warn if we have other data frame types here,
1390			 * they must not get here.
1391			 */
1392			WARN_ON(hdr->frame_control &
1393					cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1394			WARN_ON(!(hdr->seq_ctrl &
1395					cpu_to_le16(IEEE80211_SCTL_FRAG)));
1396			/*
1397			 * This was a fragment of a frame, received while
1398			 * a block-ack session was active. That cannot be
1399			 * right, so terminate the session.
1400			 */
1401			mutex_lock(&local->sta_mtx);
1402			sta = sta_info_get_bss(sdata, mgmt->sa);
1403			if (sta) {
1404				u16 tid = ieee80211_get_tid(hdr);
1405
1406				__ieee80211_stop_rx_ba_session(
1407					sta, tid, WLAN_BACK_RECIPIENT,
1408					WLAN_REASON_QSTA_REQUIRE_SETUP,
1409					true);
1410			}
1411			mutex_unlock(&local->sta_mtx);
1412		} else switch (sdata->vif.type) {
1413		case NL80211_IFTYPE_STATION:
1414			ieee80211_sta_rx_queued_mgmt(sdata, skb);
1415			break;
1416		case NL80211_IFTYPE_ADHOC:
1417			ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1418			break;
1419		case NL80211_IFTYPE_MESH_POINT:
1420			if (!ieee80211_vif_is_mesh(&sdata->vif))
1421				break;
1422			ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1423			break;
1424		default:
1425			WARN(1, "frame for unexpected interface type");
1426			break;
1427		}
1428
1429		kfree_skb(skb);
1430	}
1431
1432	/* then other type-dependent work */
1433	switch (sdata->vif.type) {
1434	case NL80211_IFTYPE_STATION:
1435		ieee80211_sta_work(sdata);
1436		break;
1437	case NL80211_IFTYPE_ADHOC:
1438		ieee80211_ibss_work(sdata);
1439		break;
1440	case NL80211_IFTYPE_MESH_POINT:
1441		if (!ieee80211_vif_is_mesh(&sdata->vif))
1442			break;
1443		ieee80211_mesh_work(sdata);
1444		break;
1445	case NL80211_IFTYPE_OCB:
1446		ieee80211_ocb_work(sdata);
1447		break;
1448	default:
1449		break;
1450	}
1451}
1452
1453static void ieee80211_recalc_smps_work(struct work_struct *work)
1454{
1455	struct ieee80211_sub_if_data *sdata =
1456		container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1457
1458	ieee80211_recalc_smps(sdata);
1459}
1460
1461/*
1462 * Helper function to initialise an interface to a specific type.
1463 */
1464static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1465				  enum nl80211_iftype type)
1466{
1467	static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1468						    0xff, 0xff, 0xff};
1469
1470	/* clear type-dependent union */
1471	memset(&sdata->u, 0, sizeof(sdata->u));
1472
1473	/* and set some type-dependent values */
1474	sdata->vif.type = type;
1475	sdata->vif.p2p = false;
1476	sdata->wdev.iftype = type;
1477
1478	sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1479	sdata->control_port_no_encrypt = false;
1480	sdata->control_port_over_nl80211 = false;
1481	sdata->control_port_no_preauth = false;
1482	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1483	sdata->vif.bss_conf.idle = true;
1484	sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1485
1486	sdata->noack_map = 0;
1487	sdata->hw_80211_encap = false;
1488
1489	/* only monitor/p2p-device differ */
1490	if (sdata->dev) {
1491		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1492		sdata->dev->type = ARPHRD_ETHER;
1493	}
1494
1495	skb_queue_head_init(&sdata->skb_queue);
1496	INIT_WORK(&sdata->work, ieee80211_iface_work);
1497	INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1498	INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1499	INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1500	INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1501
1502	switch (type) {
1503	case NL80211_IFTYPE_P2P_GO:
1504		type = NL80211_IFTYPE_AP;
1505		sdata->vif.type = type;
1506		sdata->vif.p2p = true;
1507		fallthrough;
1508	case NL80211_IFTYPE_AP:
1509		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1510		INIT_LIST_HEAD(&sdata->u.ap.vlans);
 
 
1511		sdata->vif.bss_conf.bssid = sdata->vif.addr;
 
1512		break;
1513	case NL80211_IFTYPE_P2P_CLIENT:
1514		type = NL80211_IFTYPE_STATION;
1515		sdata->vif.type = type;
1516		sdata->vif.p2p = true;
1517		fallthrough;
1518	case NL80211_IFTYPE_STATION:
1519		sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1520		ieee80211_sta_setup_sdata(sdata);
1521		break;
1522	case NL80211_IFTYPE_OCB:
1523		sdata->vif.bss_conf.bssid = bssid_wildcard;
1524		ieee80211_ocb_setup_sdata(sdata);
1525		break;
1526	case NL80211_IFTYPE_ADHOC:
1527		sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1528		ieee80211_ibss_setup_sdata(sdata);
1529		break;
1530	case NL80211_IFTYPE_MESH_POINT:
1531		if (ieee80211_vif_is_mesh(&sdata->vif))
1532			ieee80211_mesh_init_sdata(sdata);
1533		break;
1534	case NL80211_IFTYPE_MONITOR:
1535		sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1536		sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1537		sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1538				      MONITOR_FLAG_OTHER_BSS;
1539		break;
1540	case NL80211_IFTYPE_WDS:
1541		sdata->vif.bss_conf.bssid = NULL;
1542		break;
1543	case NL80211_IFTYPE_NAN:
1544		idr_init(&sdata->u.nan.function_inst_ids);
1545		spin_lock_init(&sdata->u.nan.func_lock);
1546		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1547		break;
1548	case NL80211_IFTYPE_AP_VLAN:
1549	case NL80211_IFTYPE_P2P_DEVICE:
1550		sdata->vif.bss_conf.bssid = sdata->vif.addr;
1551		break;
1552	case NL80211_IFTYPE_UNSPECIFIED:
1553	case NUM_NL80211_IFTYPES:
1554		WARN_ON(1);
1555		break;
1556	}
1557
1558	ieee80211_debugfs_add_netdev(sdata);
1559}
1560
1561static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1562					   enum nl80211_iftype type)
1563{
1564	struct ieee80211_local *local = sdata->local;
1565	int ret, err;
1566	enum nl80211_iftype internal_type = type;
1567	bool p2p = false;
1568
1569	ASSERT_RTNL();
1570
1571	if (!local->ops->change_interface)
1572		return -EBUSY;
1573
1574	switch (sdata->vif.type) {
1575	case NL80211_IFTYPE_AP:
1576	case NL80211_IFTYPE_STATION:
1577	case NL80211_IFTYPE_ADHOC:
1578	case NL80211_IFTYPE_OCB:
1579		/*
1580		 * Could maybe also all others here?
1581		 * Just not sure how that interacts
1582		 * with the RX/config path e.g. for
1583		 * mesh.
1584		 */
1585		break;
1586	default:
1587		return -EBUSY;
1588	}
1589
1590	switch (type) {
1591	case NL80211_IFTYPE_AP:
1592	case NL80211_IFTYPE_STATION:
1593	case NL80211_IFTYPE_ADHOC:
1594	case NL80211_IFTYPE_OCB:
1595		/*
1596		 * Could probably support everything
1597		 * but WDS here (WDS do_open can fail
1598		 * under memory pressure, which this
1599		 * code isn't prepared to handle).
1600		 */
1601		break;
1602	case NL80211_IFTYPE_P2P_CLIENT:
1603		p2p = true;
1604		internal_type = NL80211_IFTYPE_STATION;
1605		break;
1606	case NL80211_IFTYPE_P2P_GO:
1607		p2p = true;
1608		internal_type = NL80211_IFTYPE_AP;
1609		break;
1610	default:
1611		return -EBUSY;
1612	}
1613
1614	ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1615	if (ret)
1616		return ret;
1617
1618	ieee80211_do_stop(sdata, false);
1619
1620	ieee80211_teardown_sdata(sdata);
1621
1622	ret = drv_change_interface(local, sdata, internal_type, p2p);
1623	if (ret)
1624		type = ieee80211_vif_type_p2p(&sdata->vif);
1625
1626	/*
1627	 * Ignore return value here, there's not much we can do since
1628	 * the driver changed the interface type internally already.
1629	 * The warnings will hopefully make driver authors fix it :-)
1630	 */
1631	ieee80211_check_queues(sdata, type);
1632
1633	ieee80211_setup_sdata(sdata, type);
1634
1635	err = ieee80211_do_open(&sdata->wdev, false);
1636	WARN(err, "type change: do_open returned %d", err);
1637
1638	return ret;
1639}
1640
1641int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1642			     enum nl80211_iftype type)
1643{
1644	int ret;
1645
1646	ASSERT_RTNL();
1647
1648	if (type == ieee80211_vif_type_p2p(&sdata->vif))
1649		return 0;
1650
1651	if (ieee80211_sdata_running(sdata)) {
1652		ret = ieee80211_runtime_change_iftype(sdata, type);
1653		if (ret)
1654			return ret;
1655	} else {
1656		/* Purge and reset type-dependent state. */
1657		ieee80211_teardown_sdata(sdata);
1658		ieee80211_setup_sdata(sdata, type);
1659	}
1660
1661	/* reset some values that shouldn't be kept across type changes */
1662	if (type == NL80211_IFTYPE_STATION)
1663		sdata->u.mgd.use_4addr = false;
1664
1665	return 0;
1666}
1667
1668static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1669				       u8 *perm_addr, enum nl80211_iftype type)
1670{
1671	struct ieee80211_sub_if_data *sdata;
1672	u64 mask, start, addr, val, inc;
1673	u8 *m;
1674	u8 tmp_addr[ETH_ALEN];
1675	int i;
1676
1677	/* default ... something at least */
1678	memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1679
1680	if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1681	    local->hw.wiphy->n_addresses <= 1)
1682		return;
1683
1684	mutex_lock(&local->iflist_mtx);
1685
1686	switch (type) {
1687	case NL80211_IFTYPE_MONITOR:
1688		/* doesn't matter */
1689		break;
1690	case NL80211_IFTYPE_WDS:
1691	case NL80211_IFTYPE_AP_VLAN:
1692		/* match up with an AP interface */
1693		list_for_each_entry(sdata, &local->interfaces, list) {
1694			if (sdata->vif.type != NL80211_IFTYPE_AP)
1695				continue;
1696			memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1697			break;
1698		}
1699		/* keep default if no AP interface present */
1700		break;
1701	case NL80211_IFTYPE_P2P_CLIENT:
1702	case NL80211_IFTYPE_P2P_GO:
1703		if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1704			list_for_each_entry(sdata, &local->interfaces, list) {
1705				if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1706					continue;
1707				if (!ieee80211_sdata_running(sdata))
1708					continue;
1709				memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1710				goto out_unlock;
1711			}
1712		}
1713		fallthrough;
1714	default:
1715		/* assign a new address if possible -- try n_addresses first */
1716		for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1717			bool used = false;
1718
1719			list_for_each_entry(sdata, &local->interfaces, list) {
1720				if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1721						     sdata->vif.addr)) {
1722					used = true;
1723					break;
1724				}
1725			}
1726
1727			if (!used) {
1728				memcpy(perm_addr,
1729				       local->hw.wiphy->addresses[i].addr,
1730				       ETH_ALEN);
1731				break;
1732			}
1733		}
1734
1735		/* try mask if available */
1736		if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1737			break;
1738
1739		m = local->hw.wiphy->addr_mask;
1740		mask =	((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1741			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1742			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1743
1744		if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1745			/* not a contiguous mask ... not handled now! */
1746			pr_info("not contiguous\n");
1747			break;
1748		}
1749
1750		/*
1751		 * Pick address of existing interface in case user changed
1752		 * MAC address manually, default to perm_addr.
1753		 */
1754		m = local->hw.wiphy->perm_addr;
1755		list_for_each_entry(sdata, &local->interfaces, list) {
1756			if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1757				continue;
1758			m = sdata->vif.addr;
1759			break;
1760		}
1761		start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1762			((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1763			((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1764
1765		inc = 1ULL<<__ffs64(mask);
1766		val = (start & mask);
1767		addr = (start & ~mask) | (val & mask);
1768		do {
1769			bool used = false;
1770
1771			tmp_addr[5] = addr >> 0*8;
1772			tmp_addr[4] = addr >> 1*8;
1773			tmp_addr[3] = addr >> 2*8;
1774			tmp_addr[2] = addr >> 3*8;
1775			tmp_addr[1] = addr >> 4*8;
1776			tmp_addr[0] = addr >> 5*8;
1777
1778			val += inc;
1779
1780			list_for_each_entry(sdata, &local->interfaces, list) {
1781				if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1782					used = true;
1783					break;
1784				}
1785			}
1786
1787			if (!used) {
1788				memcpy(perm_addr, tmp_addr, ETH_ALEN);
1789				break;
1790			}
1791			addr = (start & ~mask) | (val & mask);
1792		} while (addr != start);
1793
1794		break;
1795	}
1796
1797 out_unlock:
1798	mutex_unlock(&local->iflist_mtx);
1799}
1800
1801int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1802		     unsigned char name_assign_type,
1803		     struct wireless_dev **new_wdev, enum nl80211_iftype type,
1804		     struct vif_params *params)
1805{
1806	struct net_device *ndev = NULL;
1807	struct ieee80211_sub_if_data *sdata = NULL;
1808	struct txq_info *txqi;
1809	void (*if_setup)(struct net_device *dev);
1810	int ret, i;
1811	int txqs = 1;
1812
1813	ASSERT_RTNL();
1814
1815	if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1816		struct wireless_dev *wdev;
1817
1818		sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1819				GFP_KERNEL);
1820		if (!sdata)
1821			return -ENOMEM;
1822		wdev = &sdata->wdev;
1823
1824		sdata->dev = NULL;
1825		strlcpy(sdata->name, name, IFNAMSIZ);
1826		ieee80211_assign_perm_addr(local, wdev->address, type);
1827		memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1828	} else {
1829		int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1830				 sizeof(void *));
1831		int txq_size = 0;
1832
1833		if (local->ops->wake_tx_queue &&
1834		    type != NL80211_IFTYPE_AP_VLAN &&
1835		    (type != NL80211_IFTYPE_MONITOR ||
1836		     (params->flags & MONITOR_FLAG_ACTIVE)))
1837			txq_size += sizeof(struct txq_info) +
1838				    local->hw.txq_data_size;
1839
1840		if (local->ops->wake_tx_queue) {
1841			if_setup = ieee80211_if_setup_no_queue;
1842		} else {
1843			if_setup = ieee80211_if_setup;
1844			if (local->hw.queues >= IEEE80211_NUM_ACS)
1845				txqs = IEEE80211_NUM_ACS;
1846		}
1847
1848		ndev = alloc_netdev_mqs(size + txq_size,
1849					name, name_assign_type,
1850					if_setup, txqs, 1);
1851		if (!ndev)
1852			return -ENOMEM;
1853
1854		if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1855			ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1856
1857		dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1858
1859		ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1860		if (!ndev->tstats) {
1861			free_netdev(ndev);
1862			return -ENOMEM;
1863		}
1864
1865		ndev->needed_headroom = local->tx_headroom +
1866					4*6 /* four MAC addresses */
1867					+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1868					+ 6 /* mesh */
1869					+ 8 /* rfc1042/bridge tunnel */
1870					- ETH_HLEN /* ethernet hard_header_len */
1871					+ IEEE80211_ENCRYPT_HEADROOM;
1872		ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1873
1874		ret = dev_alloc_name(ndev, ndev->name);
1875		if (ret < 0) {
1876			ieee80211_if_free(ndev);
1877			free_netdev(ndev);
1878			return ret;
1879		}
1880
1881		ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1882		if (is_valid_ether_addr(params->macaddr))
1883			memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1884		else
1885			memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1886		SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1887
1888		/* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1889		sdata = netdev_priv(ndev);
1890		ndev->ieee80211_ptr = &sdata->wdev;
1891		memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1892		memcpy(sdata->name, ndev->name, IFNAMSIZ);
1893
1894		if (txq_size) {
1895			txqi = netdev_priv(ndev) + size;
1896			ieee80211_txq_init(sdata, NULL, txqi, 0);
1897		}
1898
1899		sdata->dev = ndev;
1900	}
1901
1902	/* initialise type-independent data */
1903	sdata->wdev.wiphy = local->hw.wiphy;
1904	sdata->local = local;
1905
1906	for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1907		skb_queue_head_init(&sdata->fragments[i].skb_list);
1908
1909	INIT_LIST_HEAD(&sdata->key_list);
1910
1911	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1912			  ieee80211_dfs_cac_timer_work);
1913	INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1914			  ieee80211_delayed_tailroom_dec);
1915
1916	for (i = 0; i < NUM_NL80211_BANDS; i++) {
1917		struct ieee80211_supported_band *sband;
1918		sband = local->hw.wiphy->bands[i];
1919		sdata->rc_rateidx_mask[i] =
1920			sband ? (1 << sband->n_bitrates) - 1 : 0;
1921		if (sband) {
1922			__le16 cap;
1923			u16 *vht_rate_mask;
1924
1925			memcpy(sdata->rc_rateidx_mcs_mask[i],
1926			       sband->ht_cap.mcs.rx_mask,
1927			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1928
1929			cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1930			vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1931			ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1932		} else {
1933			memset(sdata->rc_rateidx_mcs_mask[i], 0,
1934			       sizeof(sdata->rc_rateidx_mcs_mask[i]));
1935			memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1936			       sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1937		}
1938	}
1939
1940	ieee80211_set_default_queues(sdata);
1941
1942	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1943	sdata->user_power_level = local->user_power_level;
1944
1945	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1946
1947	/* setup type-dependent data */
1948	ieee80211_setup_sdata(sdata, type);
1949
1950	if (ndev) {
1951		ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1952		if (type == NL80211_IFTYPE_STATION)
1953			sdata->u.mgd.use_4addr = params->use_4addr;
1954
1955		ndev->features |= local->hw.netdev_features;
1956		ndev->hw_features |= ndev->features &
1957					MAC80211_SUPPORTED_FEATURES_TX;
1958
1959		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1960
1961		/* MTU range: 256 - 2304 */
1962		ndev->min_mtu = 256;
1963		ndev->max_mtu = local->hw.max_mtu;
1964
1965		ret = register_netdevice(ndev);
1966		if (ret) {
1967			free_netdev(ndev);
1968			return ret;
1969		}
1970	}
1971
1972	mutex_lock(&local->iflist_mtx);
1973	list_add_tail_rcu(&sdata->list, &local->interfaces);
1974	mutex_unlock(&local->iflist_mtx);
1975
1976	if (new_wdev)
1977		*new_wdev = &sdata->wdev;
1978
1979	return 0;
1980}
1981
1982void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1983{
1984	ASSERT_RTNL();
1985
1986	mutex_lock(&sdata->local->iflist_mtx);
1987	list_del_rcu(&sdata->list);
1988	mutex_unlock(&sdata->local->iflist_mtx);
1989
1990	if (sdata->vif.txq)
1991		ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1992
1993	synchronize_rcu();
1994
1995	if (sdata->dev) {
1996		unregister_netdevice(sdata->dev);
1997	} else {
1998		cfg80211_unregister_wdev(&sdata->wdev);
1999		ieee80211_teardown_sdata(sdata);
2000		kfree(sdata);
2001	}
2002}
2003
2004void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2005{
2006	if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2007		return;
2008	ieee80211_do_stop(sdata, true);
2009}
2010
2011void ieee80211_remove_interfaces(struct ieee80211_local *local)
2012{
2013	struct ieee80211_sub_if_data *sdata, *tmp;
2014	LIST_HEAD(unreg_list);
2015	LIST_HEAD(wdev_list);
2016
2017	ASSERT_RTNL();
2018
2019	/* Before destroying the interfaces, make sure they're all stopped so
2020	 * that the hardware is stopped. Otherwise, the driver might still be
2021	 * iterating the interfaces during the shutdown, e.g. from a worker
2022	 * or from RX processing or similar, and if it does so (using atomic
2023	 * iteration) while we're manipulating the list, the iteration will
2024	 * crash.
2025	 *
2026	 * After this, the hardware should be stopped and the driver should
2027	 * have stopped all of its activities, so that we can do RCU-unaware
2028	 * manipulations of the interface list below.
2029	 */
2030	cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2031
2032	WARN(local->open_count, "%s: open count remains %d\n",
2033	     wiphy_name(local->hw.wiphy), local->open_count);
2034
2035	ieee80211_txq_teardown_flows(local);
2036
2037	mutex_lock(&local->iflist_mtx);
2038	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2039		list_del(&sdata->list);
2040
2041		if (sdata->dev)
2042			unregister_netdevice_queue(sdata->dev, &unreg_list);
2043		else
2044			list_add(&sdata->list, &wdev_list);
2045	}
2046	mutex_unlock(&local->iflist_mtx);
2047	unregister_netdevice_many(&unreg_list);
2048
2049	list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2050		list_del(&sdata->list);
2051		cfg80211_unregister_wdev(&sdata->wdev);
2052		kfree(sdata);
2053	}
2054}
2055
2056static int netdev_notify(struct notifier_block *nb,
2057			 unsigned long state, void *ptr)
2058{
2059	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2060	struct ieee80211_sub_if_data *sdata;
2061
2062	if (state != NETDEV_CHANGENAME)
2063		return NOTIFY_DONE;
2064
2065	if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2066		return NOTIFY_DONE;
2067
2068	if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2069		return NOTIFY_DONE;
2070
2071	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2072	memcpy(sdata->name, dev->name, IFNAMSIZ);
2073	ieee80211_debugfs_rename_netdev(sdata);
2074
2075	return NOTIFY_OK;
2076}
2077
2078static struct notifier_block mac80211_netdev_notifier = {
2079	.notifier_call = netdev_notify,
2080};
2081
2082int ieee80211_iface_init(void)
2083{
2084	return register_netdevice_notifier(&mac80211_netdev_notifier);
2085}
2086
2087void ieee80211_iface_exit(void)
2088{
2089	unregister_netdevice_notifier(&mac80211_netdev_notifier);
2090}
2091
2092void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2093{
2094	if (sdata->vif.type == NL80211_IFTYPE_AP)
2095		atomic_inc(&sdata->u.ap.num_mcast_sta);
2096	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2097		atomic_inc(&sdata->u.vlan.num_mcast_sta);
2098}
2099
2100void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2101{
2102	if (sdata->vif.type == NL80211_IFTYPE_AP)
2103		atomic_dec(&sdata->u.ap.num_mcast_sta);
2104	else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2105		atomic_dec(&sdata->u.vlan.num_mcast_sta);
2106}