/*
   * This is the linux wireless configuration interface.
   *

   * Copyright 2006-2010		Johannes Berg <johannes@sipsolutions.net>

   * Copyright 2013-2014  Intel Mobile Communications GmbH

   * Copyright 2015	Intel Deutschland GmbH

   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/if.h>
  #include <linux/module.h>
  #include <linux/err.h>

  #include <linux/list.h>

  #include <linux/slab.h>

  #include <linux/nl80211.h>
  #include <linux/debugfs.h>
  #include <linux/notifier.h>
  #include <linux/device.h>

  #include <linux/etherdevice.h>

  #include <linux/rtnetlink.h>

  #include <linux/sched.h>

  #include <net/genetlink.h>
  #include <net/cfg80211.h>

  #include "nl80211.h"

  #include "core.h"
  #include "sysfs.h"

  #include "debugfs.h"

  #include "wext-compat.h"

  #include "rdev-ops.h"

  
  /* name for sysfs, %d is appended */
  #define PHY_NAME "phy"
  
  MODULE_AUTHOR("Johannes Berg");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("wireless configuration support");

  MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);

  /* RCU-protected (and RTNL for writers) */

  LIST_HEAD(cfg80211_rdev_list);

  int cfg80211_rdev_list_generation;

  /* for debugfs */
  static struct dentry *ieee80211_debugfs_dir;

  /* for the cleanup, scan and event works */
  struct workqueue_struct *cfg80211_wq;

  static bool cfg80211_disable_40mhz_24ghz;
  module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
  MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
  		 "Disable 40MHz support in the 2.4GHz band");

  struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)

  {

  	struct cfg80211_registered_device *result = NULL, *rdev;

  	ASSERT_RTNL();

  	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  		if (rdev->wiphy_idx == wiphy_idx) {
  			result = rdev;

  			break;
  		}
  	}
  
  	return result;
  }

  int get_wiphy_idx(struct wiphy *wiphy)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	return rdev->wiphy_idx;

  }

  struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
  {

  	struct cfg80211_registered_device *rdev;

  	ASSERT_RTNL();

  	rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
  	if (!rdev)

  		return NULL;

  	return &rdev->wiphy;

  }

  static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
  				   const char *newname)

  {

  	struct cfg80211_registered_device *rdev2;

  	int wiphy_idx, taken = -1, digits;

  	ASSERT_RTNL();

  	if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)
  		return -EINVAL;

  	/* prohibit calling the thing phy%d when %d is not its number */
  	sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken);
  	if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) {
  		/* count number of places needed to print wiphy_idx */
  		digits = 1;
  		while (wiphy_idx /= 10)
  			digits++;
  		/*
  		 * deny the name if it is phy<idx> where <idx> is printed
  		 * without leading zeroes. taken == strlen(newname) here
  		 */
  		if (taken == strlen(PHY_NAME) + digits)
  			return -EINVAL;
  	}

  	/* Ensure another device does not already have this name. */
  	list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
  		if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
  			return -EINVAL;
  
  	return 0;
  }
  
  int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
  			char *newname)
  {
  	int result;
  
  	ASSERT_RTNL();

  	/* Ignore nop renames */

  	if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)

  		return 0;

  	result = cfg80211_dev_check_name(rdev, newname);
  	if (result < 0)
  		return result;

  	result = device_rename(&rdev->wiphy.dev, newname);
  	if (result)

  		return result;

  	if (rdev->wiphy.debugfsdir &&
  	    !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,

  			    rdev->wiphy.debugfsdir,
  			    rdev->wiphy.debugfsdir->d_parent,
  			    newname))

  		pr_err("failed to rename debugfs dir to %s!
  ", newname);

  	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);

  	return 0;

  }

  int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
  			  struct net *net)
  {
  	struct wireless_dev *wdev;
  	int err = 0;

  	if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK))

  		return -EOPNOTSUPP;

  	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

  		if (!wdev->netdev)
  			continue;

  		wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
  		err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
  		if (err)
  			break;
  		wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
  	}
  
  	if (err) {
  		/* failed -- clean up to old netns */
  		net = wiphy_net(&rdev->wiphy);

  		list_for_each_entry_continue_reverse(wdev,
  						     &rdev->wiphy.wdev_list,

  						     list) {

  			if (!wdev->netdev)
  				continue;

  			wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
  			err = dev_change_net_namespace(wdev->netdev, net,
  							"wlan%d");
  			WARN_ON(err);
  			wdev->netdev->features |= NETIF_F_NETNS_LOCAL;
  		}

  
  		return err;

  	}
  
  	wiphy_net_set(&rdev->wiphy, net);

  	err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev));
  	WARN_ON(err);
  
  	return 0;

  }

  static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
  {

  	struct cfg80211_registered_device *rdev = data;

  	rdev_rfkill_poll(rdev);

  }

  void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
  			      struct wireless_dev *wdev)
  {

  	ASSERT_RTNL();

  
  	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE))
  		return;

  	if (!wdev_running(wdev))

  		return;
  
  	rdev_stop_p2p_device(rdev, wdev);

  	wdev->is_running = false;

  
  	rdev->opencount--;

  	if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
  		if (WARN_ON(!rdev->scan_req->notified))

  			rdev->scan_req->info.aborted = true;

  		___cfg80211_scan_done(rdev, false);

  	}

  }

  void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
  		       struct wireless_dev *wdev)
  {
  	ASSERT_RTNL();
  
  	if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
  		return;

  	if (!wdev_running(wdev))

  		return;
  
  	rdev_stop_nan(rdev, wdev);

  	wdev->is_running = false;

  
  	rdev->opencount--;
  }

  void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)

  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	struct wireless_dev *wdev;

  	ASSERT_RTNL();

  	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {

  		if (wdev->netdev) {

  			dev_close(wdev->netdev);

  			continue;
  		}
  		/* otherwise, check iftype */
  		switch (wdev->iftype) {
  		case NL80211_IFTYPE_P2P_DEVICE:

  			cfg80211_stop_p2p_device(rdev, wdev);

  			break;

  		case NL80211_IFTYPE_NAN:
  			cfg80211_stop_nan(rdev, wdev);
  			break;

  		default:
  			break;
  		}
  	}

  }
  EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);

  static int cfg80211_rfkill_set_block(void *data, bool blocked)
  {
  	struct cfg80211_registered_device *rdev = data;
  
  	if (!blocked)
  		return 0;
  
  	rtnl_lock();
  	cfg80211_shutdown_all_interfaces(&rdev->wiphy);

  	rtnl_unlock();
  
  	return 0;
  }
  
  static void cfg80211_rfkill_sync_work(struct work_struct *work)
  {

  	struct cfg80211_registered_device *rdev;

  	rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync);
  	cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill));

  }

  static void cfg80211_event_work(struct work_struct *work)
  {
  	struct cfg80211_registered_device *rdev;

  
  	rdev = container_of(work, struct cfg80211_registered_device,
  			    event_work);
  
  	rtnl_lock();

  	cfg80211_process_rdev_events(rdev);

  	rtnl_unlock();
  }

  void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
  {

  	struct wireless_dev *wdev, *tmp;

  
  	ASSERT_RTNL();

  	list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) {
  		if (wdev->nl_owner_dead)
  			rdev_del_virtual_intf(rdev, wdev);

  	}

  }
  
  static void cfg80211_destroy_iface_wk(struct work_struct *work)
  {
  	struct cfg80211_registered_device *rdev;
  
  	rdev = container_of(work, struct cfg80211_registered_device,
  			    destroy_work);
  
  	rtnl_lock();
  	cfg80211_destroy_ifaces(rdev);
  	rtnl_unlock();
  }

  static void cfg80211_sched_scan_stop_wk(struct work_struct *work)
  {
  	struct cfg80211_registered_device *rdev;

  	struct cfg80211_sched_scan_request *req, *tmp;

  
  	rdev = container_of(work, struct cfg80211_registered_device,
  			   sched_scan_stop_wk);
  
  	rtnl_lock();

  	list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
  		if (req->nl_owner_dead)
  			cfg80211_stop_sched_scan_req(rdev, req, false);
  	}

  	rtnl_unlock();
  }

  static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
  {
  	struct cfg80211_registered_device *rdev;
  
  	rdev = container_of(work, struct cfg80211_registered_device,
  			    propagate_radar_detect_wk);
  
  	rtnl_lock();
  
  	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
  				       NL80211_DFS_UNAVAILABLE,
  				       NL80211_RADAR_DETECTED);
  
  	rtnl_unlock();
  }
  
  static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
  {
  	struct cfg80211_registered_device *rdev;
  
  	rdev = container_of(work, struct cfg80211_registered_device,
  			    propagate_cac_done_wk);
  
  	rtnl_lock();
  
  	regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
  				       NL80211_DFS_AVAILABLE,
  				       NL80211_RADAR_CAC_FINISHED);
  
  	rtnl_unlock();
  }

  /* exported functions */

  struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
  			   const char *requested_name)

  {

  	static atomic_t wiphy_counter = ATOMIC_INIT(0);

  	struct cfg80211_registered_device *rdev;

  	int alloc_size;

  	WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
  	WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
  	WARN_ON(ops->connect && !ops->disconnect);
  	WARN_ON(ops->join_ibss && !ops->leave_ibss);
  	WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
  	WARN_ON(ops->add_station && !ops->del_station);
  	WARN_ON(ops->add_mpath && !ops->del_mpath);

  	WARN_ON(ops->join_mesh && !ops->leave_mesh);

  	WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
  	WARN_ON(ops->start_ap && !ops->stop_ap);
  	WARN_ON(ops->join_ocb && !ops->leave_ocb);
  	WARN_ON(ops->suspend && !ops->resume);
  	WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
  	WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
  	WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
  	WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);

  	alloc_size = sizeof(*rdev) + sizeof_priv;

  	rdev = kzalloc(alloc_size, GFP_KERNEL);
  	if (!rdev)

  		return NULL;

  	rdev->ops = ops;

  	rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);

  	if (unlikely(rdev->wiphy_idx < 0)) {

  		/* ugh, wrapped! */

  		atomic_dec(&wiphy_counter);

  		kfree(rdev);

  		return NULL;
  	}

  	/* atomic_inc_return makes it start at 1, make it start at 0 */
  	rdev->wiphy_idx--;

  	/* give it a proper name */

  	if (requested_name && requested_name[0]) {
  		int rv;
  
  		rtnl_lock();
  		rv = cfg80211_dev_check_name(rdev, requested_name);
  
  		if (rv < 0) {
  			rtnl_unlock();
  			goto use_default_name;
  		}
  
  		rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
  		rtnl_unlock();
  		if (rv)
  			goto use_default_name;
  	} else {

  		int rv;

  use_default_name:
  		/* NOTE:  This is *probably* safe w/out holding rtnl because of
  		 * the restrictions on phy names.  Probably this call could
  		 * fail if some other part of the kernel (re)named a device
  		 * phyX.  But, might should add some locking and check return
  		 * value, and use a different name if this one exists?
  		 */

  		rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
  		if (rv < 0) {
  			kfree(rdev);
  			return NULL;
  		}

  	}

  	INIT_LIST_HEAD(&rdev->wiphy.wdev_list);

  	INIT_LIST_HEAD(&rdev->beacon_registrations);
  	spin_lock_init(&rdev->beacon_registrations_lock);

  	spin_lock_init(&rdev->bss_lock);
  	INIT_LIST_HEAD(&rdev->bss_list);

  	INIT_LIST_HEAD(&rdev->sched_scan_req_list);

  	INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done);

  	INIT_LIST_HEAD(&rdev->mlme_unreg);
  	spin_lock_init(&rdev->mlme_unreg_lock);
  	INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk);

  	INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
  			  cfg80211_dfs_channels_update_work);

  #ifdef CONFIG_CFG80211_WEXT
  	rdev->wiphy.wext = &cfg80211_wext_handler;
  #endif

  	device_initialize(&rdev->wiphy.dev);
  	rdev->wiphy.dev.class = &ieee80211_class;
  	rdev->wiphy.dev.platform_data = rdev;

  	device_enable_async_suspend(&rdev->wiphy.dev);

  	INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);

  	INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);

  	INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);

  	INIT_WORK(&rdev->propagate_radar_detect_wk,
  		  cfg80211_propagate_radar_detect_wk);
  	INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);

  #ifdef CONFIG_CFG80211_DEFAULT_PS
  	rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT;
  #endif

  	wiphy_net_set(&rdev->wiphy, &init_net);

  	rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block;
  	rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev),
  				   &rdev->wiphy.dev, RFKILL_TYPE_WLAN,
  				   &rdev->rfkill_ops, rdev);
  
  	if (!rdev->rfkill) {
  		kfree(rdev);

  		return NULL;
  	}

  	INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work);
  	INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
  	INIT_WORK(&rdev->event_work, cfg80211_event_work);

  	init_waitqueue_head(&rdev->dev_wait);

  	/*
  	 * Initialize wiphy parameters to IEEE 802.11 MIB default values.
  	 * Fragmentation and RTS threshold are disabled by default with the
  	 * special -1 value.
  	 */

  	rdev->wiphy.retry_short = 7;
  	rdev->wiphy.retry_long = 4;
  	rdev->wiphy.frag_threshold = (u32) -1;
  	rdev->wiphy.rts_threshold = (u32) -1;

  	rdev->wiphy.coverage_class = 0;

  	rdev->wiphy.max_num_csa_counters = 1;

  	rdev->wiphy.max_sched_scan_plans = 1;
  	rdev->wiphy.max_sched_scan_plan_interval = U32_MAX;

  	return &rdev->wiphy;

  }

  EXPORT_SYMBOL(wiphy_new_nm);

  static int wiphy_verify_combinations(struct wiphy *wiphy)
  {
  	const struct ieee80211_iface_combination *c;
  	int i, j;

  	for (i = 0; i < wiphy->n_iface_combinations; i++) {
  		u32 cnt = 0;
  		u16 all_iftypes = 0;
  
  		c = &wiphy->iface_combinations[i];

  		/*
  		 * Combinations with just one interface aren't real,
  		 * however we make an exception for DFS.
  		 */
  		if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))

  			return -EINVAL;
  
  		/* Need at least one channel */
  		if (WARN_ON(!c->num_different_channels))
  			return -EINVAL;

  		/*
  		 * Put a sane limit on maximum number of different
  		 * channels to simplify channel accounting code.
  		 */
  		if (WARN_ON(c->num_different_channels >
  				CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
  			return -EINVAL;

  		/* DFS only works on one channel. */
  		if (WARN_ON(c->radar_detect_widths &&
  			    (c->num_different_channels > 1)))
  			return -EINVAL;

  		if (WARN_ON(!c->n_limits))
  			return -EINVAL;
  
  		for (j = 0; j < c->n_limits; j++) {
  			u16 types = c->limits[j].types;

  			/* interface types shouldn't overlap */

  			if (WARN_ON(types & all_iftypes))
  				return -EINVAL;
  			all_iftypes |= types;
  
  			if (WARN_ON(!c->limits[j].max))
  				return -EINVAL;
  
  			/* Shouldn't list software iftypes in combinations! */
  			if (WARN_ON(wiphy->software_iftypes & types))
  				return -EINVAL;

  			/* Only a single P2P_DEVICE can be allowed */
  			if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
  				    c->limits[j].max > 1))
  				return -EINVAL;

  			/* Only a single NAN can be allowed */
  			if (WARN_ON(types & BIT(NL80211_IFTYPE_NAN) &&
  				    c->limits[j].max > 1))
  				return -EINVAL;

  			/*
  			 * This isn't well-defined right now. If you have an
  			 * IBSS interface, then its beacon interval may change
  			 * by joining other networks, and nothing prevents it
  			 * from doing that.
  			 * So technically we probably shouldn't even allow AP
  			 * and IBSS in the same interface, but it seems that
  			 * some drivers support that, possibly only with fixed
  			 * beacon intervals for IBSS.
  			 */
  			if (WARN_ON(types & BIT(NL80211_IFTYPE_ADHOC) &&
  				    c->beacon_int_min_gcd)) {
  				return -EINVAL;
  			}

  			cnt += c->limits[j].max;
  			/*
  			 * Don't advertise an unsupported type
  			 * in a combination.
  			 */
  			if (WARN_ON((wiphy->interface_modes & types) != types))
  				return -EINVAL;
  		}

  #ifndef CONFIG_WIRELESS_WDS
  		if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
  			return -EINVAL;
  #endif

  		/* You can't even choose that many! */
  		if (WARN_ON(cnt < c->max_interfaces))
  			return -EINVAL;
  	}
  
  	return 0;
  }

  int wiphy_register(struct wiphy *wiphy)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	int res;

  	enum nl80211_band band;

  	struct ieee80211_supported_band *sband;
  	bool have_band = false;
  	int i;

  	u16 ifmodes = wiphy->interface_modes;

  #ifdef CONFIG_PM

  	if (WARN_ON(wiphy->wowlan &&
  		    (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
  		    !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
  		return -EINVAL;
  	if (WARN_ON(wiphy->wowlan &&
  		    !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
  		    !wiphy->wowlan->tcp))

  		return -EINVAL;

  #endif

  	if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
  		    (!rdev->ops->tdls_channel_switch ||
  		     !rdev->ops->tdls_cancel_channel_switch)))
  		return -EINVAL;

  	if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&

  		    (!rdev->ops->start_nan || !rdev->ops->stop_nan ||

  		     !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
  		     !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))

  		return -EINVAL;

  #ifndef CONFIG_WIRELESS_WDS
  	if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
  		return -EINVAL;
  #endif

  	/*
  	 * if a wiphy has unsupported modes for regulatory channel enforcement,
  	 * opt-out of enforcement checking
  	 */
  	if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) |
  				       BIT(NL80211_IFTYPE_P2P_CLIENT) |
  				       BIT(NL80211_IFTYPE_AP) |
  				       BIT(NL80211_IFTYPE_P2P_GO) |
  				       BIT(NL80211_IFTYPE_ADHOC) |
  				       BIT(NL80211_IFTYPE_P2P_DEVICE) |

  				       BIT(NL80211_IFTYPE_NAN) |

  				       BIT(NL80211_IFTYPE_AP_VLAN) |
  				       BIT(NL80211_IFTYPE_MONITOR)))
  		wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;

  	if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) &&
  		    (wiphy->regulatory_flags &
  					(REGULATORY_CUSTOM_REG |
  					 REGULATORY_STRICT_REG |
  					 REGULATORY_COUNTRY_IE_FOLLOW_POWER |
  					 REGULATORY_COUNTRY_IE_IGNORE))))
  		return -EINVAL;

  	if (WARN_ON(wiphy->coalesce &&
  		    (!wiphy->coalesce->n_rules ||
  		     !wiphy->coalesce->n_patterns) &&
  		    (!wiphy->coalesce->pattern_min_len ||
  		     wiphy->coalesce->pattern_min_len >
  			wiphy->coalesce->pattern_max_len)))
  		return -EINVAL;

  	if (WARN_ON(wiphy->ap_sme_capa &&
  		    !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME)))
  		return -EINVAL;

  	if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
  		return -EINVAL;
  
  	if (WARN_ON(wiphy->addresses &&
  		    !is_zero_ether_addr(wiphy->perm_addr) &&
  		    memcmp(wiphy->perm_addr, wiphy->addresses[0].addr,
  			   ETH_ALEN)))
  		return -EINVAL;

  	if (WARN_ON(wiphy->max_acl_mac_addrs &&
  		    (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
  		     !rdev->ops->set_mac_acl)))
  		return -EINVAL;

  	/* assure only valid behaviours are flagged by driver
  	 * hence subtract 2 as bit 0 is invalid.
  	 */
  	if (WARN_ON(wiphy->bss_select_support &&
  		    (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2))))
  		return -EINVAL;

  	if (WARN_ON(wiphy_ext_feature_isset(&rdev->wiphy,
  					    NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_1X) &&
  		    (!rdev->ops->set_pmk || !rdev->ops->del_pmk)))
  		return -EINVAL;

  	if (wiphy->addresses)
  		memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);

  	/* sanity check ifmodes */
  	WARN_ON(!ifmodes);

  	ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;

  	if (WARN_ON(ifmodes != wiphy->interface_modes))
  		wiphy->interface_modes = ifmodes;

  	res = wiphy_verify_combinations(wiphy);
  	if (res)
  		return res;

  	/* sanity check supported bands/channels */

  	for (band = 0; band < NUM_NL80211_BANDS; band++) {

  		sband = wiphy->bands[band];
  		if (!sband)
  			continue;
  
  		sband->band = band;

  		if (WARN_ON(!sband->n_channels))
  			return -EINVAL;
  		/*

  		 * on 60GHz band, there are no legacy rates, so

  		 * n_bitrates is 0
  		 */

  		if (WARN_ON(band != NL80211_BAND_60GHZ &&

  			    !sband->n_bitrates))

  			return -EINVAL;
  
  		/*

  		 * Since cfg80211_disable_40mhz_24ghz is global, we can
  		 * modify the sband's ht data even if the driver uses a
  		 * global structure for that.
  		 */
  		if (cfg80211_disable_40mhz_24ghz &&

  		    band == NL80211_BAND_2GHZ &&

  		    sband->ht_cap.ht_supported) {
  			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
  			sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
  		}
  
  		/*

  		 * Since we use a u32 for rate bitmaps in
  		 * ieee80211_get_response_rate, we cannot
  		 * have more than 32 legacy rates.
  		 */
  		if (WARN_ON(sband->n_bitrates > 32))

  			return -EINVAL;

  
  		for (i = 0; i < sband->n_channels; i++) {
  			sband->channels[i].orig_flags =
  				sband->channels[i].flags;

  			sband->channels[i].orig_mag = INT_MAX;

  			sband->channels[i].orig_mpwr =
  				sband->channels[i].max_power;
  			sband->channels[i].band = band;
  		}
  
  		have_band = true;
  	}
  
  	if (!have_band) {
  		WARN_ON(1);
  		return -EINVAL;
  	}

  #ifdef CONFIG_PM

  	if (WARN_ON(rdev->wiphy.wowlan && rdev->wiphy.wowlan->n_patterns &&
  		    (!rdev->wiphy.wowlan->pattern_min_len ||
  		     rdev->wiphy.wowlan->pattern_min_len >
  				rdev->wiphy.wowlan->pattern_max_len)))
  		return -EINVAL;

  #endif

  	/* check and set up bitrates */
  	ieee80211_set_bitrate_flags(wiphy);

  	rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;

  	rtnl_lock();

  	res = device_add(&rdev->wiphy.dev);

  	if (res) {

  		rtnl_unlock();

  		return res;
  	}

  	/* set up regulatory info */

  	wiphy_regulatory_register(wiphy);

  	list_add_rcu(&rdev->list, &cfg80211_rdev_list);

  	cfg80211_rdev_list_generation++;

  
  	/* add to debugfs */

  	rdev->wiphy.debugfsdir =
  		debugfs_create_dir(wiphy_name(&rdev->wiphy),

  				   ieee80211_debugfs_dir);

  	if (IS_ERR(rdev->wiphy.debugfsdir))
  		rdev->wiphy.debugfsdir = NULL;

  	cfg80211_debugfs_rdev_add(rdev);
  	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);

  	if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {

  		struct regulatory_request request;
  
  		request.wiphy_idx = get_wiphy_idx(wiphy);
  		request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
  		request.alpha2[0] = '9';
  		request.alpha2[1] = '9';
  
  		nl80211_send_reg_change_event(&request);
  	}

  	/* Check that nobody globally advertises any capabilities they do not
  	 * advertise on all possible interface types.
  	 */
  	if (wiphy->extended_capabilities_len &&
  	    wiphy->num_iftype_ext_capab &&
  	    wiphy->iftype_ext_capab) {
  		u8 supported_on_all, j;
  		const struct wiphy_iftype_ext_capab *capab;
  
  		capab = wiphy->iftype_ext_capab;
  		for (j = 0; j < wiphy->extended_capabilities_len; j++) {
  			if (capab[0].extended_capabilities_len > j)
  				supported_on_all =
  					capab[0].extended_capabilities[j];
  			else
  				supported_on_all = 0x00;
  			for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
  				if (j >= capab[i].extended_capabilities_len) {
  					supported_on_all = 0x00;
  					break;
  				}
  				supported_on_all &=
  					capab[i].extended_capabilities[j];
  			}
  			if (WARN_ON(wiphy->extended_capabilities[j] &
  				    ~supported_on_all))
  				break;
  		}
  	}

  	rdev->wiphy.registered = true;
  	rtnl_unlock();

  
  	res = rfkill_register(rdev->rfkill);
  	if (res) {
  		rfkill_destroy(rdev->rfkill);
  		rdev->rfkill = NULL;
  		wiphy_unregister(&rdev->wiphy);
  		return res;
  	}

  	return 0;

  }
  EXPORT_SYMBOL(wiphy_register);

  void wiphy_rfkill_start_polling(struct wiphy *wiphy)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	if (!rdev->ops->rfkill_poll)

  		return;

  	rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
  	rfkill_resume_polling(rdev->rfkill);

  }
  EXPORT_SYMBOL(wiphy_rfkill_start_polling);
  
  void wiphy_rfkill_stop_polling(struct wiphy *wiphy)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	rfkill_pause_polling(rdev->rfkill);

  }
  EXPORT_SYMBOL(wiphy_rfkill_stop_polling);

  void wiphy_unregister(struct wiphy *wiphy)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	wait_event(rdev->dev_wait, ({
  		int __count;

  		rtnl_lock();

  		__count = rdev->opencount;

  		rtnl_unlock();

  		__count == 0; }));

  	if (rdev->rfkill)
  		rfkill_unregister(rdev->rfkill);

  	rtnl_lock();

  	nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);

  	rdev->wiphy.registered = false;

  	WARN_ON(!list_empty(&rdev->wiphy.wdev_list));

  
  	/*
  	 * First remove the hardware from everywhere, this makes
  	 * it impossible to find from userspace.
  	 */

  	debugfs_remove_recursive(rdev->wiphy.debugfsdir);

  	list_del_rcu(&rdev->list);
  	synchronize_rcu();

  
  	/*

  	 * If this device got a regulatory hint tell core its
  	 * free to listen now to a new shiny device regulatory hint
  	 */
  	wiphy_regulatory_deregister(wiphy);

  	cfg80211_rdev_list_generation++;

  	device_del(&rdev->wiphy.dev);

  	rtnl_unlock();

  	flush_work(&rdev->scan_done_wk);

  	cancel_work_sync(&rdev->conn_work);

  	flush_work(&rdev->event_work);

  	cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);

  	flush_work(&rdev->destroy_work);

  	flush_work(&rdev->sched_scan_stop_wk);

  	flush_work(&rdev->mlme_unreg_wk);

  	flush_work(&rdev->propagate_radar_detect_wk);
  	flush_work(&rdev->propagate_cac_done_wk);

  #ifdef CONFIG_PM
  	if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)

  		rdev_set_wakeup(rdev, false);

  #endif

  	cfg80211_rdev_free_wowlan(rdev);

  	cfg80211_rdev_free_coalesce(rdev);

  }
  EXPORT_SYMBOL(wiphy_unregister);

  void cfg80211_dev_free(struct cfg80211_registered_device *rdev)

  {

  	struct cfg80211_internal_bss *scan, *tmp;

  	struct cfg80211_beacon_registration *reg, *treg;

  	rfkill_destroy(rdev->rfkill);

  	list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
  		list_del(&reg->list);
  		kfree(reg);
  	}

  	list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)

  		cfg80211_put_bss(&rdev->wiphy, &scan->pub);

  	kfree(rdev);

  }
  
  void wiphy_free(struct wiphy *wiphy)
  {
  	put_device(&wiphy->dev);
  }
  EXPORT_SYMBOL(wiphy_free);

  void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

  	if (rfkill_set_hw_state(rdev->rfkill, blocked))
  		schedule_work(&rdev->rfkill_sync);

  }
  EXPORT_SYMBOL(wiphy_rfkill_set_hw_state);

  void cfg80211_cqm_config_free(struct wireless_dev *wdev)
  {
  	kfree(wdev->cqm_config);
  	wdev->cqm_config = NULL;
  }

  void cfg80211_unregister_wdev(struct wireless_dev *wdev)
  {

  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

  
  	ASSERT_RTNL();
  
  	if (WARN_ON(wdev->netdev))
  		return;

  	nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);

  	list_del_rcu(&wdev->list);
  	rdev->devlist_generation++;
  
  	switch (wdev->iftype) {
  	case NL80211_IFTYPE_P2P_DEVICE:

  		cfg80211_mlme_purge_registrations(wdev);

  		cfg80211_stop_p2p_device(rdev, wdev);

  		break;

  	case NL80211_IFTYPE_NAN:
  		cfg80211_stop_nan(rdev, wdev);
  		break;

  	default:
  		WARN_ON_ONCE(1);
  		break;
  	}

  
  	cfg80211_cqm_config_free(wdev);

  }
  EXPORT_SYMBOL(cfg80211_unregister_wdev);

  static const struct device_type wiphy_type = {

  	.name	= "wlan",
  };

  void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
  			       enum nl80211_iftype iftype, int num)
  {

  	ASSERT_RTNL();

  
  	rdev->num_running_ifaces += num;
  	if (iftype == NL80211_IFTYPE_MONITOR)
  		rdev->num_running_monitor_ifaces += num;

  }

  void __cfg80211_leave(struct cfg80211_registered_device *rdev,
  		      struct wireless_dev *wdev)

  {
  	struct net_device *dev = wdev->netdev;

  	struct cfg80211_sched_scan_request *pos, *tmp;

  	ASSERT_RTNL();

  	ASSERT_WDEV_LOCK(wdev);

  	switch (wdev->iftype) {
  	case NL80211_IFTYPE_ADHOC:

  		__cfg80211_leave_ibss(rdev, dev, true);

  		break;
  	case NL80211_IFTYPE_P2P_CLIENT:
  	case NL80211_IFTYPE_STATION:

  		list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
  					 list) {
  			if (dev == pos->dev)
  				cfg80211_stop_sched_scan_req(rdev, pos, false);
  		}

  #ifdef CONFIG_CFG80211_WEXT
  		kfree(wdev->wext.ie);
  		wdev->wext.ie = NULL;
  		wdev->wext.ie_len = 0;
  		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
  #endif

  		cfg80211_disconnect(rdev, dev,
  				    WLAN_REASON_DEAUTH_LEAVING, true);

  		break;
  	case NL80211_IFTYPE_MESH_POINT:

  		__cfg80211_leave_mesh(rdev, dev);

  		break;
  	case NL80211_IFTYPE_AP:

  	case NL80211_IFTYPE_P2P_GO:

  		__cfg80211_stop_ap(rdev, dev, true);

  		break;

  	case NL80211_IFTYPE_OCB:
  		__cfg80211_leave_ocb(rdev, dev);
  		break;

  	case NL80211_IFTYPE_WDS:
  		/* must be handled by mac80211/driver, has no APIs */
  		break;
  	case NL80211_IFTYPE_P2P_DEVICE:

  	case NL80211_IFTYPE_NAN:

  		/* cannot happen, has no netdev */
  		break;
  	case NL80211_IFTYPE_AP_VLAN:
  	case NL80211_IFTYPE_MONITOR:
  		/* nothing to do */
  		break;
  	case NL80211_IFTYPE_UNSPECIFIED:
  	case NUM_NL80211_IFTYPES:
  		/* invalid */

  		break;
  	}

  }

  void cfg80211_leave(struct cfg80211_registered_device *rdev,
  		    struct wireless_dev *wdev)
  {
  	wdev_lock(wdev);
  	__cfg80211_leave(rdev, wdev);
  	wdev_unlock(wdev);
  }
  
  void cfg80211_stop_iface(struct wiphy *wiphy, struct wireless_dev *wdev,
  			 gfp_t gfp)
  {
  	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
  	struct cfg80211_event *ev;
  	unsigned long flags;
  
  	trace_cfg80211_stop_iface(wiphy, wdev);
  
  	ev = kzalloc(sizeof(*ev), gfp);
  	if (!ev)
  		return;
  
  	ev->type = EVENT_STOPPED;
  
  	spin_lock_irqsave(&wdev->event_lock, flags);
  	list_add_tail(&ev->list, &wdev->event_list);
  	spin_unlock_irqrestore(&wdev->event_lock, flags);
  	queue_work(cfg80211_wq, &rdev->event_work);
  }
  EXPORT_SYMBOL(cfg80211_stop_iface);

  static int cfg80211_netdev_notifier_call(struct notifier_block *nb,

  					 unsigned long state, void *ptr)

  {

  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

  	struct wireless_dev *wdev = dev->ieee80211_ptr;

  	struct cfg80211_registered_device *rdev;

  	struct cfg80211_sched_scan_request *pos, *tmp;

  	if (!wdev)

  		return NOTIFY_DONE;

  	rdev = wiphy_to_rdev(wdev->wiphy);

  	WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);

  	switch (state) {

  	case NETDEV_POST_INIT:
  		SET_NETDEV_DEVTYPE(dev, &wiphy_type);
  		break;

  	case NETDEV_REGISTER:

  		/*
  		 * NB: cannot take rdev->mtx here because this may be
  		 * called within code protected by it when interfaces
  		 * are added with nl80211.
  		 */

  		mutex_init(&wdev->mtx);
  		INIT_LIST_HEAD(&wdev->event_list);
  		spin_lock_init(&wdev->event_lock);

  		INIT_LIST_HEAD(&wdev->mgmt_registrations);
  		spin_lock_init(&wdev->mgmt_registrations_lock);

  		/*
  		 * We get here also when the interface changes network namespaces,
  		 * as it's registered into the new one, but we don't want it to
  		 * change ID in that case. Checking if the ID is already assigned
  		 * works, because 0 isn't considered a valid ID and the memory is
  		 * 0-initialized.
  		 */
  		if (!wdev->identifier)
  			wdev->identifier = ++rdev->wdev_id;

  		list_add_rcu(&wdev->list, &rdev->wiphy.wdev_list);

  		rdev->devlist_generation++;

  		/* can only change netns with wiphy */
  		dev->features |= NETIF_F_NETNS_LOCAL;

  		if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
  				      "phy80211")) {

  			pr_err("failed to add phy80211 symlink to netdev!
  ");

  		}

  		wdev->netdev = dev;

  #ifdef CONFIG_CFG80211_WEXT

  		wdev->wext.default_key = -1;
  		wdev->wext.default_mgmt_key = -1;

  		wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;

  #endif

  		if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)

  			wdev->ps = true;

  		else

  			wdev->ps = false;

  		/* allow mac80211 to determine the timeout */
  		wdev->ps_timeout = -1;

  		if ((wdev->iftype == NL80211_IFTYPE_STATION ||

  		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||

  		     wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
  			dev->priv_flags |= IFF_DONT_BRIDGE;

  		INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);

  		nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);

  		break;

  	case NETDEV_GOING_DOWN:

  		cfg80211_leave(rdev, wdev);

  		break;
  	case NETDEV_DOWN:

  		cfg80211_update_iface_num(rdev, wdev->iftype, -1);

  		if (rdev->scan_req && rdev->scan_req->wdev == wdev) {
  			if (WARN_ON(!rdev->scan_req->notified))

  				rdev->scan_req->info.aborted = true;

  			___cfg80211_scan_done(rdev, false);

  		}

  		list_for_each_entry_safe(pos, tmp,
  					 &rdev->sched_scan_req_list, list) {
  			if (WARN_ON(pos && pos->dev == wdev->netdev))
  				cfg80211_stop_sched_scan_req(rdev, pos, false);

  		}
  
  		rdev->opencount--;
  		wake_up(&rdev->dev_wait);

  		break;
  	case NETDEV_UP:

  		cfg80211_update_iface_num(rdev, wdev->iftype, 1);

  		wdev_lock(wdev);

  		switch (wdev->iftype) {

  #ifdef CONFIG_CFG80211_WEXT

  		case NL80211_IFTYPE_ADHOC:

  			cfg80211_ibss_wext_join(rdev, wdev);

  			break;

  		case NL80211_IFTYPE_STATION:

  			cfg80211_mgd_wext_connect(rdev, wdev);

  			break;

  #endif

  #ifdef CONFIG_MAC80211_MESH

  		case NL80211_IFTYPE_MESH_POINT:

  			{
  				/* backward compat code... */
  				struct mesh_setup setup;
  				memcpy(&setup, &default_mesh_setup,
  						sizeof(setup));
  				 /* back compat only needed for mesh_id */
  				setup.mesh_id = wdev->ssid;
  				setup.mesh_id_len = wdev->mesh_id_up_len;
  				if (wdev->mesh_id_up_len)
  					__cfg80211_join_mesh(rdev, dev,
  							&setup,
  							&default_mesh_config);
  				break;
  			}
  #endif

  		default:

  			break;

  		}

  		wdev_unlock(wdev);

  		rdev->opencount++;

  
  		/*
  		 * Configure power management to the driver here so that its
  		 * correctly set also after interface type changes etc.
  		 */

  		if ((wdev->iftype == NL80211_IFTYPE_STATION ||
  		     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&

  		    rdev->ops->set_power_mgmt &&
  		    rdev_set_power_mgmt(rdev, dev, wdev->ps,
  					wdev->ps_timeout)) {
  			/* assume this means it's off */
  			wdev->ps = false;
  		}

  		break;

  	case NETDEV_UNREGISTER:

  		/*

  		 * It is possible to get NETDEV_UNREGISTER
  		 * multiple times. To detect that, check
  		 * that the interface is still on the list
  		 * of registered interfaces, and only then
  		 * remove and clean it up.
  		 */

  		if (!list_empty(&wdev->list)) {

  			nl80211_notify_iface(rdev, wdev,
  					     NL80211_CMD_DEL_INTERFACE);

  			sysfs_remove_link(&dev->dev.kobj, "phy80211");

  			list_del_rcu(&wdev->list);

  			rdev->devlist_generation++;

  			cfg80211_mlme_purge_registrations(wdev);

  #ifdef CONFIG_CFG80211_WEXT

  			kzfree(wdev->wext.keys);

  #endif

  			flush_work(&wdev->disconnect_wk);

  			cfg80211_cqm_config_free(wdev);

  		}

  		/*
  		 * synchronise (so that we won't find this netdev
  		 * from other code any more) and then clear the list
  		 * head so that the above code can safely check for
  		 * !list_empty() to avoid double-cleanup.
  		 */
  		synchronize_rcu();
  		INIT_LIST_HEAD(&wdev->list);

  		/*
  		 * Ensure that all events have been processed and
  		 * freed.
  		 */
  		cfg80211_process_wdev_events(wdev);

  
  		if (WARN_ON(wdev->current_bss)) {
  			cfg80211_unhold_bss(wdev->current_bss);
  			cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
  			wdev->current_bss = NULL;
  		}

  		break;

  	case NETDEV_PRE_UP:

  		if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
  			return notifier_from_errno(-EOPNOTSUPP);

  		if (rfkill_blocked(rdev->rfkill))
  			return notifier_from_errno(-ERFKILL);

  		break;

  	default:
  		return NOTIFY_DONE;

  	}

  	wireless_nlevent_flush();

  	return NOTIFY_OK;

  }
  
  static struct notifier_block cfg80211_netdev_notifier = {
  	.notifier_call = cfg80211_netdev_notifier_call,
  };

  static void __net_exit cfg80211_pernet_exit(struct net *net)
  {
  	struct cfg80211_registered_device *rdev;
  
  	rtnl_lock();

  	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
  		if (net_eq(wiphy_net(&rdev->wiphy), net))
  			WARN_ON(cfg80211_switch_netns(rdev, &init_net));
  	}

  	rtnl_unlock();
  }
  
  static struct pernet_operations cfg80211_pernet_ops = {
  	.exit = cfg80211_pernet_exit,
  };
  
  static int __init cfg80211_init(void)

  {

  	int err;

  	err = register_pernet_device(&cfg80211_pernet_ops);
  	if (err)
  		goto out_fail_pernet;

  	err = wiphy_sysfs_init();

  	if (err)
  		goto out_fail_sysfs;
  
  	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
  	if (err)
  		goto out_fail_notifier;

  	err = nl80211_init();
  	if (err)
  		goto out_fail_nl80211;

  	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);

  	err = regulatory_init();
  	if (err)
  		goto out_fail_reg;

  	cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);

  	if (!cfg80211_wq) {
  		err = -ENOMEM;

  		goto out_fail_wq;

  	}

  	return 0;

  out_fail_wq:
  	regulatory_exit();

  out_fail_reg:
  	debugfs_remove(ieee80211_debugfs_dir);

  	nl80211_exit();

  out_fail_nl80211:
  	unregister_netdevice_notifier(&cfg80211_netdev_notifier);

  out_fail_notifier:
  	wiphy_sysfs_exit();
  out_fail_sysfs:

  	unregister_pernet_device(&cfg80211_pernet_ops);
  out_fail_pernet:

  	return err;
  }

  subsys_initcall(cfg80211_init);

  static void __exit cfg80211_exit(void)

  {
  	debugfs_remove(ieee80211_debugfs_dir);

  	nl80211_exit();

  	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
  	wiphy_sysfs_exit();

  	regulatory_exit();

  	unregister_pernet_device(&cfg80211_pernet_ops);

  	destroy_workqueue(cfg80211_wq);

  }
  module_exit(cfg80211_exit);