1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * This is the linux wireless configuration interface.
   4 *
   5 * Copyright 2006-2010		Johannes Berg <johannes@sipsolutions.net>
   6 * Copyright 2013-2014  Intel Mobile Communications GmbH
   7 * Copyright 2015-2017	Intel Deutschland GmbH
   8 * Copyright (C) 2018-2024 Intel Corporation
   9 */
  10
  11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13#include <linux/if.h>
  14#include <linux/module.h>
  15#include <linux/err.h>
  16#include <linux/list.h>
  17#include <linux/slab.h>
  18#include <linux/nl80211.h>
  19#include <linux/debugfs.h>
  20#include <linux/notifier.h>
  21#include <linux/device.h>
  22#include <linux/etherdevice.h>
  23#include <linux/rtnetlink.h>
  24#include <linux/sched.h>
  25#include <net/genetlink.h>
  26#include <net/cfg80211.h>
  27#include "nl80211.h"
  28#include "core.h"
  29#include "sysfs.h"
  30#include "debugfs.h"
  31#include "wext-compat.h"
  32#include "rdev-ops.h"
  33
  34/* name for sysfs, %d is appended */
  35#define PHY_NAME "phy"
  36
  37MODULE_AUTHOR("Johannes Berg");
  38MODULE_LICENSE("GPL");
  39MODULE_DESCRIPTION("wireless configuration support");
  40MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);
  41
  42/* RCU-protected (and RTNL for writers) */
  43LIST_HEAD(cfg80211_rdev_list);
  44int cfg80211_rdev_list_generation;
  45
  46/* for debugfs */
  47static struct dentry *ieee80211_debugfs_dir;
  48
  49/* for the cleanup, scan and event works */
  50struct workqueue_struct *cfg80211_wq;
  51
  52static bool cfg80211_disable_40mhz_24ghz;
  53module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  54MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  55		 "Disable 40MHz support in the 2.4GHz band");
  56
  57struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
  58{
  59	struct cfg80211_registered_device *result = NULL, *rdev;
  60
  61	ASSERT_RTNL();
  62
  63	for_each_rdev(rdev) {
  64		if (rdev->wiphy_idx == wiphy_idx) {
  65			result = rdev;
  66			break;
  67		}
  68	}
  69
  70	return result;
  71}
  72
  73int get_wiphy_idx(struct wiphy *wiphy)
  74{
  75	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  76
  77	return rdev->wiphy_idx;
  78}
  79
  80struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  81{
  82	struct cfg80211_registered_device *rdev;
  83
  84	ASSERT_RTNL();
  85
  86	rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  87	if (!rdev)
  88		return NULL;
  89	return &rdev->wiphy;
  90}
  91
  92static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  93				   const char *newname)
  94{
  95	struct cfg80211_registered_device *rdev2;
  96	int wiphy_idx, taken = -1, digits;
  97
  98	ASSERT_RTNL();
  99
 100	if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
 101		return -EINVAL;
 102
 103	/* prohibit calling the thing phy%d when %d is not its number */
 104	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
 105	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
 106		/* count number of places needed to print wiphy_idx */
 107		digits = 1;
 108		while (wiphy_idx /= 10)
 109			digits++;
 110		/*
 111		 * deny the name if it is phy<idx> where <idx> is printed
 112		 * without leading zeroes. taken == strlen(newname) here
 113		 */
 114		if (taken == strlen(PHY_NAME) + digits)
 115			return -EINVAL;
 116	}
 117
 118	/* Ensure another device does not already have this name. */
 119	for_each_rdev(rdev2)
 120		if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
 121			return -EINVAL;
 122
 123	return 0;
 124}
 125
 126int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 127			char *newname)
 128{
 129	int result;
 130
 131	ASSERT_RTNL();
 132	lockdep_assert_wiphy(&rdev->wiphy);
 133
 134	/* Ignore nop renames */
 135	if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
 136		return 0;
 137
 138	result = cfg80211_dev_check_name(rdev, newname);
 139	if (result < 0)
 140		return result;
 141
 142	result = device_rename(&rdev->wiphy.dev, newname);
 143	if (result)
 144		return result;
 145
 146	if (!IS_ERR_OR_NULL(rdev->wiphy.debugfsdir))
 147		debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
 148			       rdev->wiphy.debugfsdir,
 149			       rdev->wiphy.debugfsdir->d_parent, newname);
 
 
 150
 151	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 152
 153	return 0;
 154}
 155
 156int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
 157			  struct net *net)
 158{
 159	struct wireless_dev *wdev;
 160	int err = 0;
 161
 162	if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))
 163		return -EOPNOTSUPP;
 164
 165	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 166		if (!wdev->netdev)
 167			continue;
 168		wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 169		err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
 170		if (err)
 171			break;
 172		wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 173	}
 174
 175	if (err) {
 176		/* failed -- clean up to old netns */
 177		net = wiphy_net(&rdev->wiphy);
 178
 179		list_for_each_entry_continue_reverse(wdev,
 180						     &rdev->wiphy.wdev_list,
 181						     list) {
 182			if (!wdev->netdev)
 183				continue;
 184			wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
 185			err = dev_change_net_namespace(wdev->netdev, net,
 186							"wlan%d");
 187			WARN_ON(err);
 188			wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
 189		}
 190
 191		return err;
 192	}
 193
 194	wiphy_lock(&rdev->wiphy);
 195	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 196		if (!wdev->netdev)
 197			continue;
 198		nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
 199	}
 200
 201	nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
 202
 203	wiphy_net_set(&rdev->wiphy, net);
 204
 205	err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
 206	WARN_ON(err);
 207
 208	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 209
 210	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 211		if (!wdev->netdev)
 212			continue;
 213		nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
 214	}
 215	wiphy_unlock(&rdev->wiphy);
 216
 217	return 0;
 218}
 219
 220static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
 221{
 222	struct cfg80211_registered_device *rdev = data;
 223
 224	wiphy_lock(&rdev->wiphy);
 225	rdev_rfkill_poll(rdev);
 226	wiphy_unlock(&rdev->wiphy);
 227}
 228
 229void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
 230			      struct wireless_dev *wdev)
 231{
 232	lockdep_assert_held(&rdev->wiphy.mtx);
 233
 234	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
 235		return;
 236
 237	if (!wdev_running(wdev))
 238		return;
 239
 240	rdev_stop_p2p_device(rdev, wdev);
 241	wdev->is_running = false;
 242
 243	rdev->opencount--;
 244
 245	if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
 246		if (WARN_ON(!rdev->scan_req->notified &&
 247			    (!rdev->int_scan_req ||
 248			     !rdev->int_scan_req->notified)))
 249			rdev->scan_req->info.aborted = true;
 250		___cfg80211_scan_done(rdev, false);
 251	}
 252}
 253
 254void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
 255		       struct wireless_dev *wdev)
 256{
 257	lockdep_assert_held(&rdev->wiphy.mtx);
 258
 259	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
 260		return;
 261
 262	if (!wdev_running(wdev))
 263		return;
 264
 265	rdev_stop_nan(rdev, wdev);
 266	wdev->is_running = false;
 267
 268	rdev->opencount--;
 269}
 270
 271void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
 272{
 273	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 274	struct wireless_dev *wdev;
 275
 276	ASSERT_RTNL();
 277
 278	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 279		if (wdev->netdev) {
 280			dev_close(wdev->netdev);
 281			continue;
 282		}
 283
 284		/* otherwise, check iftype */
 285
 286		wiphy_lock(wiphy);
 287
 288		switch (wdev->iftype) {
 289		case NL80211_IFTYPE_P2P_DEVICE:
 290			cfg80211_stop_p2p_device(rdev, wdev);
 291			break;
 292		case NL80211_IFTYPE_NAN:
 293			cfg80211_stop_nan(rdev, wdev);
 294			break;
 295		default:
 296			break;
 297		}
 298
 299		wiphy_unlock(wiphy);
 300	}
 301}
 302EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
 303
 304static int cfg80211_rfkill_set_block(void *data, bool blocked)
 305{
 306	struct cfg80211_registered_device *rdev = data;
 307
 308	if (!blocked)
 309		return 0;
 310
 311	rtnl_lock();
 312	cfg80211_shutdown_all_interfaces(&rdev->wiphy);
 313	rtnl_unlock();
 314
 315	return 0;
 316}
 317
 318static void cfg80211_rfkill_block_work(struct work_struct *work)
 319{
 320	struct cfg80211_registered_device *rdev;
 321
 322	rdev = container_of(work, struct cfg80211_registered_device,
 323			    rfkill_block);
 324	cfg80211_rfkill_set_block(rdev, true);
 325}
 326
 327static void cfg80211_event_work(struct work_struct *work)
 328{
 329	struct cfg80211_registered_device *rdev;
 330
 331	rdev = container_of(work, struct cfg80211_registered_device,
 332			    event_work);
 333
 334	wiphy_lock(&rdev->wiphy);
 335	cfg80211_process_rdev_events(rdev);
 336	wiphy_unlock(&rdev->wiphy);
 337}
 338
 339void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
 340{
 341	struct wireless_dev *wdev, *tmp;
 342
 343	ASSERT_RTNL();
 344
 345	list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
 346		if (wdev->nl_owner_dead) {
 347			if (wdev->netdev)
 348				dev_close(wdev->netdev);
 349
 350			wiphy_lock(&rdev->wiphy);
 351			cfg80211_leave(rdev, wdev);
 352			cfg80211_remove_virtual_intf(rdev, wdev);
 353			wiphy_unlock(&rdev->wiphy);
 354		}
 355	}
 356}
 357
 358static void cfg80211_destroy_iface_wk(struct work_struct *work)
 359{
 360	struct cfg80211_registered_device *rdev;
 361
 362	rdev = container_of(work, struct cfg80211_registered_device,
 363			    destroy_work);
 364
 365	rtnl_lock();
 366	cfg80211_destroy_ifaces(rdev);
 367	rtnl_unlock();
 368}
 369
 370static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
 371					struct wiphy_work *work)
 372{
 373	struct cfg80211_registered_device *rdev;
 374	struct cfg80211_sched_scan_request *req, *tmp;
 375
 376	rdev = container_of(work, struct cfg80211_registered_device,
 377			   sched_scan_stop_wk);
 378
 
 379	list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 380		if (req->nl_owner_dead)
 381			cfg80211_stop_sched_scan_req(rdev, req, false);
 382	}
 
 383}
 384
 385static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
 386{
 387	struct cfg80211_registered_device *rdev;
 388
 389	rdev = container_of(work, struct cfg80211_registered_device,
 390			    propagate_radar_detect_wk);
 391
 392	rtnl_lock();
 393
 394	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
 395				       NL80211_DFS_UNAVAILABLE,
 396				       NL80211_RADAR_DETECTED);
 397
 398	rtnl_unlock();
 399}
 400
 401static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
 402{
 403	struct cfg80211_registered_device *rdev;
 404
 405	rdev = container_of(work, struct cfg80211_registered_device,
 406			    propagate_cac_done_wk);
 407
 408	rtnl_lock();
 409
 410	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
 411				       NL80211_DFS_AVAILABLE,
 412				       NL80211_RADAR_CAC_FINISHED);
 413
 414	rtnl_unlock();
 415}
 416
 417static void cfg80211_wiphy_work(struct work_struct *work)
 418{
 419	struct cfg80211_registered_device *rdev;
 420	struct wiphy_work *wk;
 421
 422	rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);
 423
 424	wiphy_lock(&rdev->wiphy);
 425	if (rdev->suspended)
 426		goto out;
 427
 428	spin_lock_irq(&rdev->wiphy_work_lock);
 429	wk = list_first_entry_or_null(&rdev->wiphy_work_list,
 430				      struct wiphy_work, entry);
 431	if (wk) {
 432		list_del_init(&wk->entry);
 433		if (!list_empty(&rdev->wiphy_work_list))
 434			schedule_work(work);
 435		spin_unlock_irq(&rdev->wiphy_work_lock);
 436
 437		wk->func(&rdev->wiphy, wk);
 438	} else {
 439		spin_unlock_irq(&rdev->wiphy_work_lock);
 440	}
 441out:
 442	wiphy_unlock(&rdev->wiphy);
 443}
 444
 445/* exported functions */
 446
 447struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
 448			   const char *requested_name)
 449{
 450	static atomic_t wiphy_counter = ATOMIC_INIT(0);
 451
 452	struct cfg80211_registered_device *rdev;
 453	int alloc_size;
 454
 455	WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
 456	WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
 457	WARN_ON(ops->connect && !ops->disconnect);
 458	WARN_ON(ops->join_ibss && !ops->leave_ibss);
 459	WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
 460	WARN_ON(ops->add_station && !ops->del_station);
 461	WARN_ON(ops->add_mpath && !ops->del_mpath);
 462	WARN_ON(ops->join_mesh && !ops->leave_mesh);
 463	WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
 464	WARN_ON(ops->start_ap && !ops->stop_ap);
 465	WARN_ON(ops->join_ocb && !ops->leave_ocb);
 466	WARN_ON(ops->suspend && !ops->resume);
 467	WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
 468	WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
 469	WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
 470	WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);
 471
 472	alloc_size = sizeof(*rdev) + sizeof_priv;
 473
 474	rdev = kzalloc(alloc_size, GFP_KERNEL);
 475	if (!rdev)
 476		return NULL;
 477
 478	rdev->ops = ops;
 479
 480	rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);
 481
 482	if (unlikely(rdev->wiphy_idx < 0)) {
 483		/* ugh, wrapped! */
 484		atomic_dec(&wiphy_counter);
 485		kfree(rdev);
 486		return NULL;
 487	}
 488
 489	/* atomic_inc_return makes it start at 1, make it start at 0 */
 490	rdev->wiphy_idx--;
 491
 492	/* give it a proper name */
 493	if (requested_name && requested_name[0]) {
 494		int rv;
 495
 496		rtnl_lock();
 497		rv = cfg80211_dev_check_name(rdev, requested_name);
 498
 499		if (rv < 0) {
 500			rtnl_unlock();
 501			goto use_default_name;
 502		}
 503
 504		rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
 505		rtnl_unlock();
 506		if (rv)
 507			goto use_default_name;
 508	} else {
 509		int rv;
 510
 511use_default_name:
 512		/* NOTE:  This is *probably* safe w/out holding rtnl because of
 513		 * the restrictions on phy names.  Probably this call could
 514		 * fail if some other part of the kernel (re)named a device
 515		 * phyX.  But, might should add some locking and check return
 516		 * value, and use a different name if this one exists?
 517		 */
 518		rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
 519		if (rv < 0) {
 520			kfree(rdev);
 521			return NULL;
 522		}
 523	}
 524
 525	mutex_init(&rdev->wiphy.mtx);
 526	INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
 527	INIT_LIST_HEAD(&rdev->beacon_registrations);
 528	spin_lock_init(&rdev->beacon_registrations_lock);
 529	spin_lock_init(&rdev->bss_lock);
 530	INIT_LIST_HEAD(&rdev->bss_list);
 531	INIT_LIST_HEAD(&rdev->sched_scan_req_list);
 532	wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
 
 
 
 533	INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
 534			  cfg80211_dfs_channels_update_work);
 535#ifdef CONFIG_CFG80211_WEXT
 536	rdev->wiphy.wext = &cfg80211_wext_handler;
 537#endif
 538
 539	device_initialize(&rdev->wiphy.dev);
 540	rdev->wiphy.dev.class = &ieee80211_class;
 541	rdev->wiphy.dev.platform_data = rdev;
 542	device_enable_async_suspend(&rdev->wiphy.dev);
 543
 544	INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
 545	wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
 546	INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
 547	INIT_WORK(&rdev->propagate_radar_detect_wk,
 548		  cfg80211_propagate_radar_detect_wk);
 549	INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
 550	INIT_WORK(&rdev->mgmt_registrations_update_wk,
 551		  cfg80211_mgmt_registrations_update_wk);
 552	spin_lock_init(&rdev->mgmt_registrations_lock);
 553
 554#ifdef CONFIG_CFG80211_DEFAULT_PS
 555	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
 556#endif
 557
 558	wiphy_net_set(&rdev->wiphy, &init_net);
 559
 560	rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
 561	rdev->wiphy.rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
 562					  &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
 563					  &rdev->rfkill_ops, rdev);
 564
 565	if (!rdev->wiphy.rfkill) {
 566		wiphy_free(&rdev->wiphy);
 567		return NULL;
 568	}
 569
 570	INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
 571	INIT_LIST_HEAD(&rdev->wiphy_work_list);
 572	spin_lock_init(&rdev->wiphy_work_lock);
 573	INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
 574	INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
 575	INIT_WORK(&rdev->event_work, cfg80211_event_work);
 576	INIT_WORK(&rdev->background_cac_abort_wk,
 577		  cfg80211_background_cac_abort_wk);
 578	INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
 579			  cfg80211_background_cac_done_wk);
 580
 581	init_waitqueue_head(&rdev->dev_wait);
 582
 583	/*
 584	 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
 585	 * Fragmentation and RTS threshold are disabled by default with the
 586	 * special -1 value.
 587	 */
 588	rdev->wiphy.retry_short = 7;
 589	rdev->wiphy.retry_long = 4;
 590	rdev->wiphy.frag_threshold = (u32) -1;
 591	rdev->wiphy.rts_threshold = (u32) -1;
 592	rdev->wiphy.coverage_class = 0;
 593
 594	rdev->wiphy.max_num_csa_counters = 1;
 595
 596	rdev->wiphy.max_sched_scan_plans = 1;
 597	rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;
 598
 599	return &rdev->wiphy;
 600}
 601EXPORT_SYMBOL(wiphy_new_nm);
 602
 603static int wiphy_verify_combinations(struct wiphy *wiphy)
 604{
 605	const struct ieee80211_iface_combination *c;
 606	int i, j;
 607
 608	for (i = 0; i < wiphy->n_iface_combinations; i++) {
 609		u32 cnt = 0;
 610		u16 all_iftypes = 0;
 611
 612		c = &wiphy->iface_combinations[i];
 613
 614		/*
 615		 * Combinations with just one interface aren't real,
 616		 * however we make an exception for DFS.
 617		 */
 618		if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
 619			return -EINVAL;
 620
 621		/* Need at least one channel */
 622		if (WARN_ON(!c->num_different_channels))
 623			return -EINVAL;
 624
 
 
 
 
 
 
 
 
 625		/* DFS only works on one channel. */
 626		if (WARN_ON(c->radar_detect_widths &&
 627			    (c->num_different_channels > 1)))
 628			return -EINVAL;
 629
 630		if (WARN_ON(!c->n_limits))
 631			return -EINVAL;
 632
 633		for (j = 0; j < c->n_limits; j++) {
 634			u16 types = c->limits[j].types;
 635
 636			/* interface types shouldn't overlap */
 637			if (WARN_ON(types & all_iftypes))
 638				return -EINVAL;
 639			all_iftypes |= types;
 640
 641			if (WARN_ON(!c->limits[j].max))
 642				return -EINVAL;
 643
 644			/* Shouldn't list software iftypes in combinations! */
 645			if (WARN_ON(wiphy->software_iftypes & types))
 646				return -EINVAL;
 647
 648			/* Only a single P2P_DEVICE can be allowed */
 649			if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
 650				    c->limits[j].max > 1))
 651				return -EINVAL;
 652
 653			/* Only a single NAN can be allowed */
 654			if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
 655				    c->limits[j].max > 1))
 656				return -EINVAL;
 657
 658			/*
 659			 * This isn't well-defined right now. If you have an
 660			 * IBSS interface, then its beacon interval may change
 661			 * by joining other networks, and nothing prevents it
 662			 * from doing that.
 663			 * So technically we probably shouldn't even allow AP
 664			 * and IBSS in the same interface, but it seems that
 665			 * some drivers support that, possibly only with fixed
 666			 * beacon intervals for IBSS.
 667			 */
 668			if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
 669				    c->beacon_int_min_gcd)) {
 670				return -EINVAL;
 671			}
 672
 673			cnt += c->limits[j].max;
 674			/*
 675			 * Don't advertise an unsupported type
 676			 * in a combination.
 677			 */
 678			if (WARN_ON((wiphy->interface_modes & types) != types))
 679				return -EINVAL;
 680		}
 681
 
 682		if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
 683			return -EINVAL;
 
 684
 685		/* You can't even choose that many! */
 686		if (WARN_ON(cnt < c->max_interfaces))
 687			return -EINVAL;
 688	}
 689
 690	return 0;
 691}
 692
 693int wiphy_register(struct wiphy *wiphy)
 694{
 695	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 696	int res;
 697	enum nl80211_band band;
 698	struct ieee80211_supported_band *sband;
 699	bool have_band = false;
 700	int i;
 701	u16 ifmodes = wiphy->interface_modes;
 702
 703#ifdef CONFIG_PM
 704	if (WARN_ON(wiphy->wowlan &&
 705		    (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
 706		    !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
 707		return -EINVAL;
 708	if (WARN_ON(wiphy->wowlan &&
 709		    !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
 710		    !wiphy->wowlan->tcp))
 711		return -EINVAL;
 712#endif
 713	if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
 714		    (!rdev->ops->tdls_channel_switch ||
 715		     !rdev->ops->tdls_cancel_channel_switch)))
 716		return -EINVAL;
 717
 718	if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
 719		    (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
 720		     !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
 721		     !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
 722		return -EINVAL;
 723
 
 724	if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
 725		return -EINVAL;
 
 726
 727	if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
 728		return -EINVAL;
 729
 730	if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
 731		if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
 732			    !wiphy->pmsr_capa->ftm.non_asap))
 733			return -EINVAL;
 734		if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
 735			    !wiphy->pmsr_capa->ftm.bandwidths))
 736			return -EINVAL;
 737		if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
 738				~(BIT(NL80211_PREAMBLE_LEGACY) |
 739				  BIT(NL80211_PREAMBLE_HT) |
 740				  BIT(NL80211_PREAMBLE_VHT) |
 741				  BIT(NL80211_PREAMBLE_HE) |
 742				  BIT(NL80211_PREAMBLE_DMG))))
 743			return -EINVAL;
 744		if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
 745			     wiphy->pmsr_capa->ftm.non_trigger_based) &&
 746			    !(wiphy->pmsr_capa->ftm.preambles &
 747			      BIT(NL80211_PREAMBLE_HE))))
 748			return -EINVAL;
 749		if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
 750				~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
 751				  BIT(NL80211_CHAN_WIDTH_20) |
 752				  BIT(NL80211_CHAN_WIDTH_40) |
 753				  BIT(NL80211_CHAN_WIDTH_80) |
 754				  BIT(NL80211_CHAN_WIDTH_80P80) |
 755				  BIT(NL80211_CHAN_WIDTH_160) |
 756				  BIT(NL80211_CHAN_WIDTH_5) |
 757				  BIT(NL80211_CHAN_WIDTH_10))))
 758			return -EINVAL;
 759	}
 760
 761	if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
 762		    (wiphy->regulatory_flags &
 763					(REGULATORY_CUSTOM_REG |
 764					 REGULATORY_STRICT_REG |
 765					 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
 766					 REGULATORY_COUNTRY_IE_IGNORE))))
 767		return -EINVAL;
 768
 769	if (WARN_ON(wiphy->coalesce &&
 770		    (!wiphy->coalesce->n_rules ||
 771		     !wiphy->coalesce->n_patterns) &&
 772		    (!wiphy->coalesce->pattern_min_len ||
 773		     wiphy->coalesce->pattern_min_len >
 774			wiphy->coalesce->pattern_max_len)))
 775		return -EINVAL;
 776
 777	if (WARN_ON(wiphy->ap_sme_capa &&
 778		    !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
 779		return -EINVAL;
 780
 781	if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
 782		return -EINVAL;
 783
 784	if (WARN_ON(wiphy->addresses &&
 785		    !is_zero_ether_addr(wiphy->perm_addr) &&
 786		    memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
 787			   ETH_ALEN)))
 788		return -EINVAL;
 789
 790	if (WARN_ON(wiphy->max_acl_mac_addrs &&
 791		    (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
 792		     !rdev->ops->set_mac_acl)))
 793		return -EINVAL;
 794
 795	/* assure only valid behaviours are flagged by driver
 796	 * hence subtract 2 as bit 0 is invalid.
 797	 */
 798	if (WARN_ON(wiphy->bss_select_support &&
 799		    (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
 800		return -EINVAL;
 801
 802	if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
 803					    NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
 804		    (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
 805		return -EINVAL;
 806
 807	if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
 808		    rdev->ops->update_connect_params))
 809		return -EINVAL;
 810
 811	if (wiphy->addresses)
 812		memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
 813
 814	/* sanity check ifmodes */
 815	WARN_ON(!ifmodes);
 816	ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
 817	if (WARN_ON(ifmodes != wiphy->interface_modes))
 818		wiphy->interface_modes = ifmodes;
 819
 820	res = wiphy_verify_combinations(wiphy);
 821	if (res)
 822		return res;
 823
 824	/* sanity check supported bands/channels */
 825	for (band = 0; band < NUM_NL80211_BANDS; band++) {
 826		const struct ieee80211_sband_iftype_data *iftd;
 827		u16 types = 0;
 828		bool have_he = false;
 829
 830		sband = wiphy->bands[band];
 831		if (!sband)
 832			continue;
 833
 834		sband->band = band;
 835		if (WARN_ON(!sband->n_channels))
 836			return -EINVAL;
 837		/*
 838		 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 839		 * n_bitrates is 0
 840		 */
 841		if (WARN_ON((band != NL80211_BAND_60GHZ &&
 842			     band != NL80211_BAND_S1GHZ) &&
 843			    !sband->n_bitrates))
 844			return -EINVAL;
 845
 846		if (WARN_ON(band == NL80211_BAND_6GHZ &&
 847			    (sband->ht_cap.ht_supported ||
 848			     sband->vht_cap.vht_supported)))
 849			return -EINVAL;
 850
 851		/*
 852		 * Since cfg80211_disable_40mhz_24ghz is global, we can
 853		 * modify the sband's ht data even if the driver uses a
 854		 * global structure for that.
 855		 */
 856		if (cfg80211_disable_40mhz_24ghz &&
 857		    band == NL80211_BAND_2GHZ &&
 858		    sband->ht_cap.ht_supported) {
 859			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 860			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
 861		}
 862
 863		/*
 864		 * Since we use a u32 for rate bitmaps in
 865		 * ieee80211_get_response_rate, we cannot
 866		 * have more than 32 legacy rates.
 867		 */
 868		if (WARN_ON(sband->n_bitrates > 32))
 869			return -EINVAL;
 870
 871		for (i = 0; i < sband->n_channels; i++) {
 872			sband->channels[i].orig_flags =
 873				sband->channels[i].flags;
 874			sband->channels[i].orig_mag = INT_MAX;
 875			sband->channels[i].orig_mpwr =
 876				sband->channels[i].max_power;
 877			sband->channels[i].band = band;
 878
 879			if (WARN_ON(sband->channels[i].freq_offset >= 1000))
 880				return -EINVAL;
 881		}
 882
 883		for_each_sband_iftype_data(sband, i, iftd) {
 884			bool has_ap, has_non_ap;
 885			u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
 886				      BIT(NL80211_IFTYPE_P2P_GO);
 887
 888			if (WARN_ON(!iftd->types_mask))
 889				return -EINVAL;
 890			if (WARN_ON(types & iftd->types_mask))
 891				return -EINVAL;
 892
 893			/* at least one piece of information must be present */
 894			if (WARN_ON(!iftd->he_cap.has_he))
 895				return -EINVAL;
 896
 897			types |= iftd->types_mask;
 898
 899			if (i == 0)
 900				have_he = iftd->he_cap.has_he;
 901			else
 902				have_he = have_he &&
 903					  iftd->he_cap.has_he;
 904
 905			has_ap = iftd->types_mask & ap_bits;
 906			has_non_ap = iftd->types_mask & ~ap_bits;
 907
 908			/*
 909			 * For EHT 20 MHz STA, the capabilities format differs
 910			 * but to simplify, don't check 20 MHz but rather check
 911			 * only if AP and non-AP were mentioned at the same time,
 912			 * reject if so.
 913			 */
 914			if (WARN_ON(iftd->eht_cap.has_eht &&
 915				    has_ap && has_non_ap))
 916				return -EINVAL;
 917		}
 918
 919		if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
 920			return -EINVAL;
 921
 922		have_band = true;
 923	}
 924
 925	if (!have_band) {
 926		WARN_ON(1);
 927		return -EINVAL;
 928	}
 929
 930	for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
 931		/*
 932		 * Validate we have a policy (can be explicitly set to
 933		 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
 934		 * we have at least one of doit/dumpit.
 935		 */
 936		if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
 937			return -EINVAL;
 938		if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
 939			    !rdev->wiphy.vendor_commands[i].dumpit))
 940			return -EINVAL;
 941	}
 942
 943#ifdef CONFIG_PM
 944	if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
 945		    (!rdev->wiphy.wowlan->pattern_min_len ||
 946		     rdev->wiphy.wowlan->pattern_min_len >
 947				rdev->wiphy.wowlan->pattern_max_len)))
 948		return -EINVAL;
 949#endif
 950
 951	if (!wiphy->max_num_akm_suites)
 952		wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
 953	else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
 954		 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
 955		return -EINVAL;
 956
 957	/* check and set up bitrates */
 958	ieee80211_set_bitrate_flags(wiphy);
 959
 960	rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;
 961
 962	rtnl_lock();
 963	wiphy_lock(&rdev->wiphy);
 964	res = device_add(&rdev->wiphy.dev);
 965	if (res) {
 966		wiphy_unlock(&rdev->wiphy);
 967		rtnl_unlock();
 968		return res;
 969	}
 970
 
 
 
 971	list_add_rcu(&rdev->list, &cfg80211_rdev_list);
 972	cfg80211_rdev_list_generation++;
 973
 974	/* add to debugfs */
 975	rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
 976						    ieee80211_debugfs_dir);
 
 
 
 977
 978	cfg80211_debugfs_rdev_add(rdev);
 979	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 980	wiphy_unlock(&rdev->wiphy);
 981
 982	/* set up regulatory info */
 983	wiphy_regulatory_register(wiphy);
 984
 985	if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
 986		struct regulatory_request request;
 987
 988		request.wiphy_idx = get_wiphy_idx(wiphy);
 989		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 990		request.alpha2[0] = '9';
 991		request.alpha2[1] = '9';
 992
 993		nl80211_send_reg_change_event(&request);
 994	}
 995
 996	/* Check that nobody globally advertises any capabilities they do not
 997	 * advertise on all possible interface types.
 998	 */
 999	if (wiphy->extended_capabilities_len &&
1000	    wiphy->num_iftype_ext_capab &&
1001	    wiphy->iftype_ext_capab) {
1002		u8 supported_on_all, j;
1003		const struct wiphy_iftype_ext_capab *capab;
1004
1005		capab = wiphy->iftype_ext_capab;
1006		for (j = 0; j < wiphy->extended_capabilities_len; j++) {
1007			if (capab[0].extended_capabilities_len > j)
1008				supported_on_all =
1009					capab[0].extended_capabilities[j];
1010			else
1011				supported_on_all = 0x00;
1012			for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
1013				if (j >= capab[i].extended_capabilities_len) {
1014					supported_on_all = 0x00;
1015					break;
1016				}
1017				supported_on_all &=
1018					capab[i].extended_capabilities[j];
1019			}
1020			if (WARN_ON(wiphy->extended_capabilities[j] &
1021				    ~supported_on_all))
1022				break;
1023		}
1024	}
1025
1026	rdev->wiphy.registered = true;
1027	rtnl_unlock();
1028
1029	res = rfkill_register(rdev->wiphy.rfkill);
1030	if (res) {
1031		rfkill_destroy(rdev->wiphy.rfkill);
1032		rdev->wiphy.rfkill = NULL;
1033		wiphy_unregister(&rdev->wiphy);
1034		return res;
1035	}
1036
1037	return 0;
1038}
1039EXPORT_SYMBOL(wiphy_register);
1040
1041void wiphy_rfkill_start_polling(struct wiphy *wiphy)
1042{
1043	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1044
1045	if (!rdev->ops->rfkill_poll)
1046		return;
1047	rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
1048	rfkill_resume_polling(wiphy->rfkill);
1049}
1050EXPORT_SYMBOL(wiphy_rfkill_start_polling);
1051
1052void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
1053				  struct wiphy_work *end)
1054{
1055	unsigned int runaway_limit = 100;
1056	unsigned long flags;
1057
1058	lockdep_assert_held(&rdev->wiphy.mtx);
1059
1060	spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1061	while (!list_empty(&rdev->wiphy_work_list)) {
1062		struct wiphy_work *wk;
1063
1064		wk = list_first_entry(&rdev->wiphy_work_list,
1065				      struct wiphy_work, entry);
1066		list_del_init(&wk->entry);
1067		spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1068
1069		wk->func(&rdev->wiphy, wk);
1070
1071		spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1072
1073		if (wk == end)
1074			break;
1075
1076		if (WARN_ON(--runaway_limit == 0))
1077			INIT_LIST_HEAD(&rdev->wiphy_work_list);
1078	}
1079	spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1080}
 
1081
1082void wiphy_unregister(struct wiphy *wiphy)
1083{
1084	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1085
1086	wait_event(rdev->dev_wait, ({
1087		int __count;
1088		wiphy_lock(&rdev->wiphy);
1089		__count = rdev->opencount;
1090		wiphy_unlock(&rdev->wiphy);
1091		__count == 0; }));
1092
1093	if (rdev->wiphy.rfkill)
1094		rfkill_unregister(rdev->wiphy.rfkill);
1095
1096	rtnl_lock();
1097	wiphy_lock(&rdev->wiphy);
1098	nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
1099	rdev->wiphy.registered = false;
1100
1101	WARN_ON(!list_empty(&rdev->wiphy.wdev_list));
1102
1103	/*
1104	 * First remove the hardware from everywhere, this makes
1105	 * it impossible to find from userspace.
1106	 */
1107	debugfs_remove_recursive(rdev->wiphy.debugfsdir);
1108	list_del_rcu(&rdev->list);
1109	synchronize_rcu();
1110
1111	/*
1112	 * If this device got a regulatory hint tell core its
1113	 * free to listen now to a new shiny device regulatory hint
1114	 */
1115	wiphy_regulatory_deregister(wiphy);
1116
1117	cfg80211_rdev_list_generation++;
1118	device_del(&rdev->wiphy.dev);
1119
1120#ifdef CONFIG_PM
1121	if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
1122		rdev_set_wakeup(rdev, false);
1123#endif
1124
1125	/* surely nothing is reachable now, clean up work */
1126	cfg80211_process_wiphy_works(rdev, NULL);
1127	wiphy_unlock(&rdev->wiphy);
1128	rtnl_unlock();
1129
1130	/* this has nothing to do now but make sure it's gone */
1131	cancel_work_sync(&rdev->wiphy_work);
1132
1133	cancel_work_sync(&rdev->conn_work);
1134	flush_work(&rdev->event_work);
1135	cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
1136	cancel_delayed_work_sync(&rdev->background_cac_done_wk);
1137	flush_work(&rdev->destroy_work);
 
 
1138	flush_work(&rdev->propagate_radar_detect_wk);
1139	flush_work(&rdev->propagate_cac_done_wk);
1140	flush_work(&rdev->mgmt_registrations_update_wk);
1141	flush_work(&rdev->background_cac_abort_wk);
1142
 
 
 
 
1143	cfg80211_rdev_free_wowlan(rdev);
1144	cfg80211_rdev_free_coalesce(rdev);
1145}
1146EXPORT_SYMBOL(wiphy_unregister);
1147
1148void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
1149{
1150	struct cfg80211_internal_bss *scan, *tmp;
1151	struct cfg80211_beacon_registration *reg, *treg;
1152	rfkill_destroy(rdev->wiphy.rfkill);
1153	list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
1154		list_del(&reg->list);
1155		kfree(reg);
1156	}
1157	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
1158		cfg80211_put_bss(&rdev->wiphy, &scan->pub);
1159	mutex_destroy(&rdev->wiphy.mtx);
1160
1161	/*
1162	 * The 'regd' can only be non-NULL if we never finished
1163	 * initializing the wiphy and thus never went through the
1164	 * unregister path - e.g. in failure scenarios. Thus, it
1165	 * cannot have been visible to anyone if non-NULL, so we
1166	 * can just free it here.
1167	 */
1168	kfree(rcu_dereference_raw(rdev->wiphy.regd));
1169
1170	kfree(rdev);
1171}
1172
1173void wiphy_free(struct wiphy *wiphy)
1174{
1175	put_device(&wiphy->dev);
1176}
1177EXPORT_SYMBOL(wiphy_free);
1178
1179void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
1180				      enum rfkill_hard_block_reasons reason)
1181{
1182	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1183
1184	if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
1185		schedule_work(&rdev->rfkill_block);
1186}
1187EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);
1188
1189static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
1190				      bool unregister_netdev)
 
 
 
 
 
1191{
1192	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
1193	struct cfg80211_cqm_config *cqm_config;
1194	unsigned int link_id;
1195
1196	ASSERT_RTNL();
1197	lockdep_assert_held(&rdev->wiphy.mtx);
1198
1199	nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
1200
1201	wdev->registered = false;
1202
1203	if (wdev->netdev) {
1204		sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
1205		if (unregister_netdev)
1206			unregister_netdevice(wdev->netdev);
1207	}
1208
1209	list_del_rcu(&wdev->list);
1210	synchronize_net();
1211	rdev->devlist_generation++;
1212
1213	cfg80211_mlme_purge_registrations(wdev);
1214
1215	switch (wdev->iftype) {
1216	case NL80211_IFTYPE_P2P_DEVICE:
 
1217		cfg80211_stop_p2p_device(rdev, wdev);
1218		break;
1219	case NL80211_IFTYPE_NAN:
1220		cfg80211_stop_nan(rdev, wdev);
1221		break;
1222	default:
 
1223		break;
1224	}
1225
1226#ifdef CONFIG_CFG80211_WEXT
1227	kfree_sensitive(wdev->wext.keys);
1228	wdev->wext.keys = NULL;
1229#endif
1230	wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
1231	/* deleted from the list, so can't be found from nl80211 any more */
1232	cqm_config = rcu_access_pointer(wdev->cqm_config);
1233	kfree_rcu(cqm_config, rcu_head);
1234
1235	/*
1236	 * Ensure that all events have been processed and
1237	 * freed.
1238	 */
1239	cfg80211_process_wdev_events(wdev);
1240
1241	if (wdev->iftype == NL80211_IFTYPE_STATION ||
1242	    wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
1243		for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
1244			struct cfg80211_internal_bss *curbss;
1245
1246			curbss = wdev->links[link_id].client.current_bss;
1247
1248			if (WARN_ON(curbss)) {
1249				cfg80211_unhold_bss(curbss);
1250				cfg80211_put_bss(wdev->wiphy, &curbss->pub);
1251				wdev->links[link_id].client.current_bss = NULL;
1252			}
1253		}
1254	}
1255
1256	wdev->connected = false;
1257}
1258
1259void cfg80211_unregister_wdev(struct wireless_dev *wdev)
1260{
1261	_cfg80211_unregister_wdev(wdev, true);
1262}
1263EXPORT_SYMBOL(cfg80211_unregister_wdev);
1264
1265static const struct device_type wiphy_type = {
1266	.name	= "wlan",
1267};
1268
1269void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
1270			       enum nl80211_iftype iftype, int num)
1271{
1272	lockdep_assert_held(&rdev->wiphy.mtx);
1273
1274	rdev->num_running_ifaces += num;
1275	if (iftype == NL80211_IFTYPE_MONITOR)
1276		rdev->num_running_monitor_ifaces += num;
1277}
1278
1279void cfg80211_leave(struct cfg80211_registered_device *rdev,
1280		    struct wireless_dev *wdev)
1281{
1282	struct net_device *dev = wdev->netdev;
1283	struct cfg80211_sched_scan_request *pos, *tmp;
1284
1285	lockdep_assert_held(&rdev->wiphy.mtx);
1286
1287	cfg80211_pmsr_wdev_down(wdev);
1288
1289	cfg80211_stop_background_radar_detection(wdev);
1290
1291	switch (wdev->iftype) {
1292	case NL80211_IFTYPE_ADHOC:
1293		cfg80211_leave_ibss(rdev, dev, true);
1294		break;
1295	case NL80211_IFTYPE_P2P_CLIENT:
1296	case NL80211_IFTYPE_STATION:
1297		list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
1298					 list) {
1299			if (dev == pos->dev)
1300				cfg80211_stop_sched_scan_req(rdev, pos, false);
1301		}
1302
1303#ifdef CONFIG_CFG80211_WEXT
1304		kfree(wdev->wext.ie);
1305		wdev->wext.ie = NULL;
1306		wdev->wext.ie_len = 0;
1307		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1308#endif
1309		cfg80211_disconnect(rdev, dev,
1310				    WLAN_REASON_DEAUTH_LEAVING, true);
1311		break;
1312	case NL80211_IFTYPE_MESH_POINT:
1313		cfg80211_leave_mesh(rdev, dev);
1314		break;
1315	case NL80211_IFTYPE_AP:
1316	case NL80211_IFTYPE_P2P_GO:
1317		cfg80211_stop_ap(rdev, dev, -1, true);
1318		break;
1319	case NL80211_IFTYPE_OCB:
1320		cfg80211_leave_ocb(rdev, dev);
 
 
 
1321		break;
1322	case NL80211_IFTYPE_P2P_DEVICE:
1323	case NL80211_IFTYPE_NAN:
1324		/* cannot happen, has no netdev */
1325		break;
1326	case NL80211_IFTYPE_AP_VLAN:
1327	case NL80211_IFTYPE_MONITOR:
1328		/* nothing to do */
1329		break;
1330	case NL80211_IFTYPE_UNSPECIFIED:
1331	case NL80211_IFTYPE_WDS:
1332	case NUM_NL80211_IFTYPES:
1333		/* invalid */
1334		break;
1335	}
1336}
1337
 
 
 
 
 
 
 
 
1338void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
1339			 gfp_t gfp)
1340{
1341	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1342	struct cfg80211_event *ev;
1343	unsigned long flags;
1344
1345	trace_cfg80211_stop_iface(wiphy, wdev);
1346
1347	ev = kzalloc(sizeof(*ev), gfp);
1348	if (!ev)
1349		return;
1350
1351	ev->type = EVENT_STOPPED;
1352
1353	spin_lock_irqsave(&wdev->event_lock, flags);
1354	list_add_tail(&ev->list, &wdev->event_list);
1355	spin_unlock_irqrestore(&wdev->event_lock, flags);
1356	queue_work(cfg80211_wq, &rdev->event_work);
1357}
1358EXPORT_SYMBOL(cfg80211_stop_iface);
1359
1360void cfg80211_init_wdev(struct wireless_dev *wdev)
1361{
1362	INIT_LIST_HEAD(&wdev->event_list);
1363	spin_lock_init(&wdev->event_lock);
1364	INIT_LIST_HEAD(&wdev->mgmt_registrations);
1365	INIT_LIST_HEAD(&wdev->pmsr_list);
1366	spin_lock_init(&wdev->pmsr_lock);
1367	INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);
1368
1369#ifdef CONFIG_CFG80211_WEXT
1370	wdev->wext.default_key = -1;
1371	wdev->wext.default_mgmt_key = -1;
1372	wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
1373#endif
1374
1375	wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);
1376
1377	if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
1378		wdev->ps = true;
1379	else
1380		wdev->ps = false;
1381	/* allow mac80211 to determine the timeout */
1382	wdev->ps_timeout = -1;
1383
1384	if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1385	     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
1386	     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
1387		wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;
1388
1389	INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
1390}
1391
1392void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
1393			    struct wireless_dev *wdev)
1394{
1395	ASSERT_RTNL();
1396	lockdep_assert_held(&rdev->wiphy.mtx);
1397
1398	/*
1399	 * We get here also when the interface changes network namespaces,
1400	 * as it's registered into the new one, but we don't want it to
1401	 * change ID in that case. Checking if the ID is already assigned
1402	 * works, because 0 isn't considered a valid ID and the memory is
1403	 * 0-initialized.
1404	 */
1405	if (!wdev->identifier)
1406		wdev->identifier = ++rdev->wdev_id;
1407	list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);
1408	rdev->devlist_generation++;
1409	wdev->registered = true;
1410
1411	if (wdev->netdev &&
1412	    sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
1413			      "phy80211"))
1414		pr_err("failed to add phy80211 symlink to netdev!\n");
1415
1416	nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
1417}
1418
1419int cfg80211_register_netdevice(struct net_device *dev)
1420{
1421	struct wireless_dev *wdev = dev->ieee80211_ptr;
1422	struct cfg80211_registered_device *rdev;
1423	int ret;
1424
1425	ASSERT_RTNL();
1426
1427	if (WARN_ON(!wdev))
1428		return -EINVAL;
1429
1430	rdev = wiphy_to_rdev(wdev->wiphy);
1431
1432	lockdep_assert_held(&rdev->wiphy.mtx);
1433
1434	/* we'll take care of this */
1435	wdev->registered = true;
1436	wdev->registering = true;
1437	ret = register_netdevice(dev);
1438	if (ret)
1439		goto out;
1440
1441	cfg80211_register_wdev(rdev, wdev);
1442	ret = 0;
1443out:
1444	wdev->registering = false;
1445	if (ret)
1446		wdev->registered = false;
1447	return ret;
1448}
1449EXPORT_SYMBOL(cfg80211_register_netdevice);
1450
1451static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
1452					 unsigned long state, void *ptr)
1453{
1454	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1455	struct wireless_dev *wdev = dev->ieee80211_ptr;
1456	struct cfg80211_registered_device *rdev;
1457	struct cfg80211_sched_scan_request *pos, *tmp;
1458
1459	if (!wdev)
1460		return NOTIFY_DONE;
1461
1462	rdev = wiphy_to_rdev(wdev->wiphy);
1463
1464	WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);
1465
1466	switch (state) {
1467	case NETDEV_POST_INIT:
1468		SET_NETDEV_DEVTYPE(dev, &wiphy_type);
1469		wdev->netdev = dev;
1470		/* can only change netns with wiphy */
1471		dev->features |= NETIF_F_NETNS_LOCAL;
1472
1473		cfg80211_init_wdev(wdev);
1474		break;
1475	case NETDEV_REGISTER:
1476		if (!wdev->registered) {
1477			wiphy_lock(&rdev->wiphy);
1478			cfg80211_register_wdev(rdev, wdev);
1479			wiphy_unlock(&rdev->wiphy);
1480		}
1481		break;
1482	case NETDEV_UNREGISTER:
1483		/*
1484		 * It is possible to get NETDEV_UNREGISTER multiple times,
1485		 * so check wdev->registered.
 
1486		 */
1487		if (wdev->registered && !wdev->registering) {
1488			wiphy_lock(&rdev->wiphy);
1489			_cfg80211_unregister_wdev(wdev, false);
1490			wiphy_unlock(&rdev->wiphy);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1491		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1492		break;
1493	case NETDEV_GOING_DOWN:
1494		wiphy_lock(&rdev->wiphy);
1495		cfg80211_leave(rdev, wdev);
1496		cfg80211_remove_links(wdev);
1497		wiphy_unlock(&rdev->wiphy);
1498		/* since we just did cfg80211_leave() nothing to do there */
1499		cancel_work_sync(&wdev->disconnect_wk);
1500		cancel_work_sync(&wdev->pmsr_free_wk);
1501		break;
1502	case NETDEV_DOWN:
1503		wiphy_lock(&rdev->wiphy);
1504		cfg80211_update_iface_num(rdev, wdev->iftype, -1);
1505		if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
1506			if (WARN_ON(!rdev->scan_req->notified &&
1507				    (!rdev->int_scan_req ||
1508				     !rdev->int_scan_req->notified)))
1509				rdev->scan_req->info.aborted = true;
1510			___cfg80211_scan_done(rdev, false);
1511		}
1512
1513		list_for_each_entry_safe(pos, tmp,
1514					 &rdev->sched_scan_req_list, list) {
1515			if (WARN_ON(pos->dev == wdev->netdev))
1516				cfg80211_stop_sched_scan_req(rdev, pos, false);
1517		}
1518
1519		rdev->opencount--;
1520		wiphy_unlock(&rdev->wiphy);
1521		wake_up(&rdev->dev_wait);
1522		break;
1523	case NETDEV_UP:
1524		wiphy_lock(&rdev->wiphy);
1525		cfg80211_update_iface_num(rdev, wdev->iftype, 1);
 
1526		switch (wdev->iftype) {
1527#ifdef CONFIG_CFG80211_WEXT
1528		case NL80211_IFTYPE_ADHOC:
1529			cfg80211_ibss_wext_join(rdev, wdev);
1530			break;
1531		case NL80211_IFTYPE_STATION:
1532			cfg80211_mgd_wext_connect(rdev, wdev);
1533			break;
1534#endif
1535#ifdef CONFIG_MAC80211_MESH
1536		case NL80211_IFTYPE_MESH_POINT:
1537			{
1538				/* backward compat code... */
1539				struct mesh_setup setup;
1540				memcpy(&setup, &default_mesh_setup,
1541						sizeof(setup));
1542				 /* back compat only needed for mesh_id */
1543				setup.mesh_id = wdev->u.mesh.id;
1544				setup.mesh_id_len = wdev->u.mesh.id_up_len;
1545				if (wdev->u.mesh.id_up_len)
1546					__cfg80211_join_mesh(rdev, dev,
1547							&setup,
1548							&default_mesh_config);
1549				break;
1550			}
1551#endif
1552		default:
1553			break;
1554		}
 
1555		rdev->opencount++;
1556
1557		/*
1558		 * Configure power management to the driver here so that its
1559		 * correctly set also after interface type changes etc.
1560		 */
1561		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
1562		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
1563		    rdev->ops->set_power_mgmt &&
1564		    rdev_set_power_mgmt(rdev, dev, wdev->ps,
1565					wdev->ps_timeout)) {
1566			/* assume this means it's off */
1567			wdev->ps = false;
1568		}
1569		wiphy_unlock(&rdev->wiphy);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1570		break;
1571	case NETDEV_PRE_UP:
1572		if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
1573					     wdev->use_4addr, 0))
1574			return notifier_from_errno(-EOPNOTSUPP);
1575
1576		if (rfkill_blocked(rdev->wiphy.rfkill))
1577			return notifier_from_errno(-ERFKILL);
1578		break;
1579	default:
1580		return NOTIFY_DONE;
1581	}
1582
1583	wireless_nlevent_flush();
1584
1585	return NOTIFY_OK;
1586}
1587
1588static struct notifier_block cfg80211_netdev_notifier = {
1589	.notifier_call = cfg80211_netdev_notifier_call,
1590};
1591
1592static void __net_exit cfg80211_pernet_exit(struct net *net)
1593{
1594	struct cfg80211_registered_device *rdev;
1595
1596	rtnl_lock();
1597	for_each_rdev(rdev) {
1598		if (net_eq(wiphy_net(&rdev->wiphy), net))
1599			WARN_ON(cfg80211_switch_netns(rdev, &init_net));
1600	}
1601	rtnl_unlock();
1602}
1603
1604static struct pernet_operations cfg80211_pernet_ops = {
1605	.exit = cfg80211_pernet_exit,
1606};
1607
1608void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
1609{
1610	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1611	unsigned long flags;
1612
1613	spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1614	if (list_empty(&work->entry))
1615		list_add_tail(&work->entry, &rdev->wiphy_work_list);
1616	spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1617
1618	queue_work(system_unbound_wq, &rdev->wiphy_work);
1619}
1620EXPORT_SYMBOL_GPL(wiphy_work_queue);
1621
1622void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
1623{
1624	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1625	unsigned long flags;
1626
1627	lockdep_assert_held(&wiphy->mtx);
1628
1629	spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1630	if (!list_empty(&work->entry))
1631		list_del_init(&work->entry);
1632	spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1633}
1634EXPORT_SYMBOL_GPL(wiphy_work_cancel);
1635
1636void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
1637{
1638	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1639	unsigned long flags;
1640	bool run;
1641
1642	spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
1643	run = !work || !list_empty(&work->entry);
1644	spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
1645
1646	if (run)
1647		cfg80211_process_wiphy_works(rdev, work);
1648}
1649EXPORT_SYMBOL_GPL(wiphy_work_flush);
1650
1651void wiphy_delayed_work_timer(struct timer_list *t)
1652{
1653	struct wiphy_delayed_work *dwork = from_timer(dwork, t, timer);
1654
1655	wiphy_work_queue(dwork->wiphy, &dwork->work);
1656}
1657EXPORT_SYMBOL(wiphy_delayed_work_timer);
1658
1659void wiphy_delayed_work_queue(struct wiphy *wiphy,
1660			      struct wiphy_delayed_work *dwork,
1661			      unsigned long delay)
1662{
1663	if (!delay) {
1664		del_timer(&dwork->timer);
1665		wiphy_work_queue(wiphy, &dwork->work);
1666		return;
1667	}
1668
1669	dwork->wiphy = wiphy;
1670	mod_timer(&dwork->timer, jiffies + delay);
1671}
1672EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);
1673
1674void wiphy_delayed_work_cancel(struct wiphy *wiphy,
1675			       struct wiphy_delayed_work *dwork)
1676{
1677	lockdep_assert_held(&wiphy->mtx);
1678
1679	del_timer_sync(&dwork->timer);
1680	wiphy_work_cancel(wiphy, &dwork->work);
1681}
1682EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);
1683
1684void wiphy_delayed_work_flush(struct wiphy *wiphy,
1685			      struct wiphy_delayed_work *dwork)
1686{
1687	lockdep_assert_held(&wiphy->mtx);
1688
1689	del_timer_sync(&dwork->timer);
1690	wiphy_work_flush(wiphy, &dwork->work);
1691}
1692EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);
1693
1694static int __init cfg80211_init(void)
1695{
1696	int err;
1697
1698	err = register_pernet_device(&cfg80211_pernet_ops);
1699	if (err)
1700		goto out_fail_pernet;
1701
1702	err = wiphy_sysfs_init();
1703	if (err)
1704		goto out_fail_sysfs;
1705
1706	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
1707	if (err)
1708		goto out_fail_notifier;
1709
1710	err = nl80211_init();
1711	if (err)
1712		goto out_fail_nl80211;
1713
1714	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
1715
1716	err = regulatory_init();
1717	if (err)
1718		goto out_fail_reg;
1719
1720	cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
1721	if (!cfg80211_wq) {
1722		err = -ENOMEM;
1723		goto out_fail_wq;
1724	}
1725
1726	return 0;
1727
1728out_fail_wq:
1729	regulatory_exit();
1730out_fail_reg:
1731	debugfs_remove(ieee80211_debugfs_dir);
1732	nl80211_exit();
1733out_fail_nl80211:
1734	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1735out_fail_notifier:
1736	wiphy_sysfs_exit();
1737out_fail_sysfs:
1738	unregister_pernet_device(&cfg80211_pernet_ops);
1739out_fail_pernet:
1740	return err;
1741}
1742fs_initcall(cfg80211_init);
1743
1744static void __exit cfg80211_exit(void)
1745{
1746	debugfs_remove(ieee80211_debugfs_dir);
1747	nl80211_exit();
1748	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
1749	wiphy_sysfs_exit();
1750	regulatory_exit();
1751	unregister_pernet_device(&cfg80211_pernet_ops);
1752	destroy_workqueue(cfg80211_wq);
1753}
1754module_exit(cfg80211_exit);