/*
   * Copyright 2002-2005, Instant802 Networks, Inc.
   * Copyright 2005-2006, Devicescape Software, Inc.
   * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>

   * Copyright 2013-2014  Intel Mobile Communications GmbH

   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <net/mac80211.h>

  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/netdevice.h>
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <linux/skbuff.h>
  #include <linux/etherdevice.h>
  #include <linux/if_arp.h>

  #include <linux/rtnetlink.h>

  #include <linux/bitmap.h>

  #include <linux/inetdevice.h>

  #include <net/net_namespace.h>

  #include <net/cfg80211.h>

  #include <net/addrconf.h>

  #include "ieee80211_i.h"

  #include "driver-ops.h"

  #include "rate.h"

  #include "mesh.h"

  #include "wep.h"

  #include "led.h"

  #include "debugfs.h"

  void ieee80211_configure_filter(struct ieee80211_local *local)

  {

  	u64 mc;

  	unsigned int changed_flags;
  	unsigned int new_flags = 0;

  	if (atomic_read(&local->iff_allmultis))

  		new_flags |= FIF_ALLMULTI;

  	if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  	    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))

  		new_flags |= FIF_BCN_PRBRESP_PROMISC;

  	if (local->fif_probe_req || local->probe_req_reg)
  		new_flags |= FIF_PROBE_REQ;

  	if (local->fif_fcsfail)
  		new_flags |= FIF_FCSFAIL;
  
  	if (local->fif_plcpfail)
  		new_flags |= FIF_PLCPFAIL;
  
  	if (local->fif_control)
  		new_flags |= FIF_CONTROL;
  
  	if (local->fif_other_bss)
  		new_flags |= FIF_OTHER_BSS;

  	if (local->fif_pspoll)
  		new_flags |= FIF_PSPOLL;

  	spin_lock_bh(&local->filter_lock);

  	changed_flags = local->filter_flags ^ new_flags;

  	mc = drv_prepare_multicast(local, &local->mc_list);

  	spin_unlock_bh(&local->filter_lock);

  	/* be a bit nasty */
  	new_flags |= (1<<31);

  	drv_configure_filter(local, changed_flags, &new_flags, mc);

  
  	WARN_ON(new_flags & (1<<31));
  
  	local->filter_flags = new_flags & ~(1<<31);
  }

  static void ieee80211_reconfig_filter(struct work_struct *work)
  {
  	struct ieee80211_local *local =
  		container_of(work, struct ieee80211_local, reconfig_filter);
  
  	ieee80211_configure_filter(local);
  }

  static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)

  {

  	struct ieee80211_sub_if_data *sdata;

  	struct cfg80211_chan_def chandef = {};

  	u32 changed = 0;

  	int power;

  	u32 offchannel_flag;

  	offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

  	if (local->scan_chandef.chan) {
  		chandef = local->scan_chandef;

  	} else if (local->tmp_channel) {

  		chandef.chan = local->tmp_channel;
  		chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
  		chandef.center_freq1 = chandef.chan->center_freq;
  	} else
  		chandef = local->_oper_chandef;
  
  	WARN(!cfg80211_chandef_valid(&chandef),
  	     "control:%d MHz width:%d center: %d/%d MHz",
  	     chandef.chan->center_freq, chandef.width,
  	     chandef.center_freq1, chandef.center_freq2);
  
  	if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))

  		local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
  	else
  		local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;

  	offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;

  	if (offchannel_flag ||
  	    !cfg80211_chandef_identical(&local->hw.conf.chandef,
  					&local->_oper_chandef)) {
  		local->hw.conf.chandef = chandef;

  		changed |= IEEE80211_CONF_CHANGE_CHANNEL;
  	}

  	if (!conf_is_ht(&local->hw.conf)) {
  		/*
  		 * mac80211.h documents that this is only valid
  		 * when the channel is set to an HT type, and
  		 * that otherwise STATIC is used.
  		 */
  		local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
  	} else if (local->hw.conf.smps_mode != local->smps_mode) {
  		local->hw.conf.smps_mode = local->smps_mode;
  		changed |= IEEE80211_CONF_CHANGE_SMPS;
  	}

  	power = ieee80211_chandef_max_power(&chandef);

  	rcu_read_lock();
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		if (!rcu_access_pointer(sdata->vif.chanctx_conf))
  			continue;

  		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  			continue;

  		power = min(power, sdata->vif.bss_conf.txpower);
  	}
  	rcu_read_unlock();

  	if (local->hw.conf.power_level != power) {
  		changed |= IEEE80211_CONF_CHANGE_POWER;
  		local->hw.conf.power_level = power;
  	}

  	return changed;
  }
  
  int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  {
  	int ret = 0;
  
  	might_sleep();
  
  	if (!local->use_chanctx)
  		changed |= ieee80211_hw_conf_chan(local);
  	else
  		changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
  			     IEEE80211_CONF_CHANGE_POWER);

  	if (changed && local->open_count) {

  		ret = drv_config(local, changed);

  		/*

  		 * Goal:

  		 * HW reconfiguration should never fail, the driver has told
  		 * us what it can support so it should live up to that promise.

  		 *
  		 * Current status:
  		 * rfkill is not integrated with mac80211 and a
  		 * configuration command can thus fail if hardware rfkill
  		 * is enabled
  		 *
  		 * FIXME: integrate rfkill with mac80211 and then add this
  		 * WARN_ON() back
  		 *

  		 */

  		/* WARN_ON(ret); */

  	}

  	return ret;
  }

  void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
  				      u32 changed)

  {

  	struct ieee80211_local *local = sdata->local;

  	if (!changed || sdata->vif.type == NL80211_IFTYPE_AP_VLAN)

  		return;

  	drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);

  }

  u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)

  {

  	sdata->vif.bss_conf.use_cts_prot = false;
  	sdata->vif.bss_conf.use_short_preamble = false;
  	sdata->vif.bss_conf.use_short_slot = false;

  	return BSS_CHANGED_ERP_CTS_PROT |
  	       BSS_CHANGED_ERP_PREAMBLE |
  	       BSS_CHANGED_ERP_SLOT;

  }

  static void ieee80211_tasklet_handler(unsigned long data)
  {
  	struct ieee80211_local *local = (struct ieee80211_local *) data;
  	struct sk_buff *skb;

  
  	while ((skb = skb_dequeue(&local->skb_queue)) ||
  	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  		switch (skb->pkt_type) {
  		case IEEE80211_RX_MSG:

  			/* Clear skb->pkt_type in order to not confuse kernel

  			 * netstack. */
  			skb->pkt_type = 0;

  			ieee80211_rx(&local->hw, skb);

  			break;
  		case IEEE80211_TX_STATUS_MSG:

  			skb->pkt_type = 0;

  			ieee80211_tx_status(&local->hw, skb);

  			break;

  		default:

  			WARN(1, "mac80211: Packet is of unknown type %d
  ",
  			     skb->pkt_type);

  			dev_kfree_skb(skb);
  			break;
  		}
  	}
  }

  static void ieee80211_restart_work(struct work_struct *work)
  {
  	struct ieee80211_local *local =
  		container_of(work, struct ieee80211_local, restart_work);

  	struct ieee80211_sub_if_data *sdata;

  	/* wait for scan work complete */
  	flush_workqueue(local->workqueue);

  	flush_work(&local->sched_scan_stopped_work);

  	WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
  	     "%s called with hardware scan in progress
  ", __func__);

  	flush_work(&local->radar_detected_work);

  	rtnl_lock();

  	list_for_each_entry(sdata, &local->interfaces, list) {
  		/*
  		 * XXX: there may be more work for other vif types and even
  		 * for station mode: a good thing would be to run most of
  		 * the iface type's dependent _stop (ieee80211_mg_stop,
  		 * ieee80211_ibss_stop) etc...
  		 * For now, fix only the specific bug that was seen: race
  		 * between csa_connection_drop_work and us.
  		 */
  		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
  			/*
  			 * This worker is scheduled from the iface worker that
  			 * runs on mac80211's workqueue, so we can't be
  			 * scheduling this worker after the cancel right here.
  			 * The exception is ieee80211_chswitch_done.
  			 * Then we can have a race...
  			 */
  			cancel_work_sync(&sdata->u.mgd.csa_connection_drop_work);
  		}

  		flush_delayed_work(&sdata->dec_tailroom_needed_wk);

  	}

  	ieee80211_scan_cancel(local);

  
  	/* make sure any new ROC will consider local->in_reconfig */
  	flush_delayed_work(&local->roc_work);
  	flush_work(&local->hw_roc_done);

  	ieee80211_reconfig(local);
  	rtnl_unlock();
  }
  
  void ieee80211_restart_hw(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);

  	trace_api_restart_hw(local);

  	wiphy_info(hw->wiphy,
  		   "Hardware restart was requested
  ");

  	/* use this reason, ieee80211_reconfig will unblock it */

  	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,

  					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  					false);

  	/*
  	 * Stop all Rx during the reconfig. We don't want state changes
  	 * or driver callbacks while this is in progress.
  	 */
  	local->in_reconfig = true;
  	barrier();

  	queue_work(system_freezable_wq, &local->restart_work);

  }
  EXPORT_SYMBOL(ieee80211_restart_hw);

  #ifdef CONFIG_INET

  static int ieee80211_ifa_changed(struct notifier_block *nb,
  				 unsigned long data, void *arg)
  {
  	struct in_ifaddr *ifa = arg;
  	struct ieee80211_local *local =
  		container_of(nb, struct ieee80211_local,
  			     ifa_notifier);
  	struct net_device *ndev = ifa->ifa_dev->dev;
  	struct wireless_dev *wdev = ndev->ieee80211_ptr;

  	struct in_device *idev;

  	struct ieee80211_sub_if_data *sdata;

  	struct ieee80211_bss_conf *bss_conf;

  	struct ieee80211_if_managed *ifmgd;

  	int c = 0;

  
  	/* Make sure it's our interface that got changed */
  	if (!wdev)
  		return NOTIFY_DONE;
  
  	if (wdev->wiphy != local->hw.wiphy)
  		return NOTIFY_DONE;

  	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);

  	bss_conf = &sdata->vif.bss_conf;

  
  	/* ARP filtering is only supported in managed mode */
  	if (sdata->vif.type != NL80211_IFTYPE_STATION)
  		return NOTIFY_DONE;

  	idev = __in_dev_get_rtnl(sdata->dev);

  	if (!idev)
  		return NOTIFY_DONE;

  	ifmgd = &sdata->u.mgd;

  	sdata_lock(sdata);

  
  	/* Copy the addresses to the bss_conf list */
  	ifa = idev->ifa_list;

  	while (ifa) {
  		if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
  			bss_conf->arp_addr_list[c] = ifa->ifa_address;

  		ifa = ifa->ifa_next;
  		c++;
  	}

  	bss_conf->arp_addr_cnt = c;

  	/* Configure driver only if associated (which also implies it is up) */

  	if (ifmgd->associated)

  		ieee80211_bss_info_change_notify(sdata,
  						 BSS_CHANGED_ARP_FILTER);

  	sdata_unlock(sdata);

  	return NOTIFY_OK;

  }

  #endif

  #if IS_ENABLED(CONFIG_IPV6)
  static int ieee80211_ifa6_changed(struct notifier_block *nb,
  				  unsigned long data, void *arg)
  {
  	struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
  	struct inet6_dev *idev = ifa->idev;
  	struct net_device *ndev = ifa->idev->dev;
  	struct ieee80211_local *local =
  		container_of(nb, struct ieee80211_local, ifa6_notifier);
  	struct wireless_dev *wdev = ndev->ieee80211_ptr;
  	struct ieee80211_sub_if_data *sdata;
  
  	/* Make sure it's our interface that got changed */
  	if (!wdev || wdev->wiphy != local->hw.wiphy)
  		return NOTIFY_DONE;
  
  	sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  
  	/*
  	 * For now only support station mode. This is mostly because
  	 * doing AP would have to handle AP_VLAN in some way ...
  	 */
  	if (sdata->vif.type != NL80211_IFTYPE_STATION)
  		return NOTIFY_DONE;
  
  	drv_ipv6_addr_change(local, sdata, idev);

  	return NOTIFY_OK;

  }
  #endif

  /* There isn't a lot of sense in it, but you can transmit anything you like */
  static const struct ieee80211_txrx_stypes
  ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
  	[NL80211_IFTYPE_ADHOC] = {
  		.tx = 0xffff,

  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  			BIT(IEEE80211_STYPE_AUTH >> 4) |

  			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),

  	},
  	[NL80211_IFTYPE_STATION] = {
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
  	},
  	[NL80211_IFTYPE_AP] = {
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
  			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
  			BIT(IEEE80211_STYPE_AUTH >> 4) |
  			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
  			BIT(IEEE80211_STYPE_ACTION >> 4),
  	},
  	[NL80211_IFTYPE_AP_VLAN] = {
  		/* copy AP */
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
  			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
  			BIT(IEEE80211_STYPE_AUTH >> 4) |
  			BIT(IEEE80211_STYPE_DEAUTH >> 4) |

  			BIT(IEEE80211_STYPE_ACTION >> 4),
  	},
  	[NL80211_IFTYPE_P2P_CLIENT] = {
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
  	},
  	[NL80211_IFTYPE_P2P_GO] = {
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |

  			BIT(IEEE80211_STYPE_DISASSOC >> 4) |
  			BIT(IEEE80211_STYPE_AUTH >> 4) |
  			BIT(IEEE80211_STYPE_DEAUTH >> 4) |
  			BIT(IEEE80211_STYPE_ACTION >> 4),
  	},

  	[NL80211_IFTYPE_MESH_POINT] = {
  		.tx = 0xffff,

  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  			BIT(IEEE80211_STYPE_AUTH >> 4) |
  			BIT(IEEE80211_STYPE_DEAUTH >> 4),

  	},

  	[NL80211_IFTYPE_P2P_DEVICE] = {
  		.tx = 0xffff,
  		.rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
  			BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
  	},

  };

  static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
  	.ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
  			     IEEE80211_HT_AMPDU_PARM_DENSITY,
  
  	.cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
  				IEEE80211_HT_CAP_MAX_AMSDU |

  				IEEE80211_HT_CAP_SGI_20 |

  				IEEE80211_HT_CAP_SGI_40 |

  				IEEE80211_HT_CAP_LDPC_CODING |
  				IEEE80211_HT_CAP_40MHZ_INTOLERANT),

  	.mcs = {
  		.rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
  			     0xff, 0xff, 0xff, 0xff, 0xff, },
  	},
  };

  static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
  	.vht_cap_info =
  		cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
  			    IEEE80211_VHT_CAP_SHORT_GI_80 |
  			    IEEE80211_VHT_CAP_SHORT_GI_160 |

  			    IEEE80211_VHT_CAP_RXSTBC_MASK |

  			    IEEE80211_VHT_CAP_TXSTBC |
  			    IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
  			    IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
  			    IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
  			    IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
  			    IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
  	.supp_mcs = {
  		.rx_mcs_map = cpu_to_le16(~0),
  		.tx_mcs_map = cpu_to_le16(~0),
  	},
  };

  struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
  					   const struct ieee80211_ops *ops,
  					   const char *requested_name)

  {

  	struct ieee80211_local *local;

  	int priv_size, i;

  	struct wiphy *wiphy;

  	bool use_chanctx;

  	if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
  		    !ops->add_interface || !ops->remove_interface ||
  		    !ops->configure_filter))
  		return NULL;

  	if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
  		return NULL;

  	/* check all or no channel context operations exist */
  	i = !!ops->add_chanctx + !!ops->remove_chanctx +
  	    !!ops->change_chanctx + !!ops->assign_vif_chanctx +
  	    !!ops->unassign_vif_chanctx;
  	if (WARN_ON(i != 0 && i != 5))
  		return NULL;

  	use_chanctx = i == 5;

  	/* Ensure 32-byte alignment of our private data and hw private data.
  	 * We use the wiphy priv data for both our ieee80211_local and for
  	 * the driver's private data
  	 *
  	 * In memory it'll be like this:
  	 *
  	 * +-------------------------+
  	 * | struct wiphy	    |
  	 * +-------------------------+
  	 * | struct ieee80211_local  |
  	 * +-------------------------+
  	 * | driver's private data   |
  	 * +-------------------------+
  	 *
  	 */

  	priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;

  	wiphy = wiphy_new_nm(&mac80211_config_ops, priv_size, requested_name);

  
  	if (!wiphy)
  		return NULL;

  	wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;

  	wiphy->privid = mac80211_wiphy_privid;

  	wiphy->flags |= WIPHY_FLAG_NETNS_OK |
  			WIPHY_FLAG_4ADDR_AP |

  			WIPHY_FLAG_4ADDR_STATION |

  			WIPHY_FLAG_REPORTS_OBSS |

  			WIPHY_FLAG_OFFCHAN_TX;
  
  	if (ops->remain_on_channel)
  		wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;

  	wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
  			   NL80211_FEATURE_SAE |

  			   NL80211_FEATURE_HT_IBSS |

  			   NL80211_FEATURE_VIF_TXPOWER |

  			   NL80211_FEATURE_MAC_ON_CREATE |

  			   NL80211_FEATURE_USERSPACE_MPM |
  			   NL80211_FEATURE_FULL_AP_CLIENT_STATE;

  	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);

  	if (!ops->hw_scan)

  		wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
  				   NL80211_FEATURE_AP_SCAN;

  	if (!ops->set_key)
  		wiphy->flags |= WIPHY_FLAG_IBSS_RSN;

  	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_RRM);

  	wiphy->bss_priv_size = sizeof(struct ieee80211_bss);

  
  	local = wiphy_priv(wiphy);

  	if (sta_info_init(local))
  		goto err_free;

  	local->hw.wiphy = wiphy;

  	local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);

  
  	local->ops = ops;

  	local->use_chanctx = use_chanctx;

  	/* set up some defaults */
  	local->hw.queues = 1;
  	local->hw.max_rates = 1;

  	local->hw.max_report_rates = 0;

  	local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;

  	local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;

  	local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;

  	local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
  	local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;

  	local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
  					 IEEE80211_RADIOTAP_MCS_HAVE_GI |
  					 IEEE80211_RADIOTAP_MCS_HAVE_BW;

  	local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
  					 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;

  	local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
  	local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;

  	local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;

  	wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;

  	wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;

  	local->ext_capa[7] = WLAN_EXT_CAPA8_OPMODE_NOTIF;
  
  	wiphy->extended_capabilities = local->ext_capa;
  	wiphy->extended_capabilities_mask = local->ext_capa;
  	wiphy->extended_capabilities_len =
  		ARRAY_SIZE(local->ext_capa);

  	INIT_LIST_HEAD(&local->interfaces);

  	INIT_LIST_HEAD(&local->mon_list);

  
  	__hw_addr_init(&local->mc_list);

  	mutex_init(&local->iflist_mtx);

  	mutex_init(&local->mtx);

  	mutex_init(&local->key_mtx);

  	spin_lock_init(&local->filter_lock);

  	spin_lock_init(&local->rx_path_lock);

  	spin_lock_init(&local->queue_stop_reason_lock);

  	INIT_LIST_HEAD(&local->chanctx_list);
  	mutex_init(&local->chanctx_mtx);

  	INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);

  	INIT_WORK(&local->restart_work, ieee80211_restart_work);

  	INIT_WORK(&local->radar_detected_work,
  		  ieee80211_dfs_radar_detected_work);

  	INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);

  	local->smps_mode = IEEE80211_SMPS_OFF;

  	INIT_WORK(&local->dynamic_ps_enable_work,
  		  ieee80211_dynamic_ps_enable_work);
  	INIT_WORK(&local->dynamic_ps_disable_work,
  		  ieee80211_dynamic_ps_disable_work);
  	setup_timer(&local->dynamic_ps_timer,
  		    ieee80211_dynamic_ps_timer, (unsigned long) local);

  	INIT_WORK(&local->sched_scan_stopped_work,
  		  ieee80211_sched_scan_stopped_work);

  	INIT_WORK(&local->tdls_chsw_work, ieee80211_tdls_chsw_work);

  	spin_lock_init(&local->ack_status_lock);
  	idr_init(&local->ack_status_frames);

  	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {

  		skb_queue_head_init(&local->pending[i]);

  		atomic_set(&local->agg_queue_stop[i], 0);
  	}

  	tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
  		     (unsigned long)local);

  
  	tasklet_init(&local->tasklet,
  		     ieee80211_tasklet_handler,
  		     (unsigned long) local);

  
  	skb_queue_head_init(&local->skb_queue);
  	skb_queue_head_init(&local->skb_queue_unreliable);

  	skb_queue_head_init(&local->skb_queue_tdls_chsw);

  	ieee80211_alloc_led_names(local);

  	ieee80211_roc_setup(local);

  	local->hw.radiotap_timestamp.units_pos = -1;
  	local->hw.radiotap_timestamp.accuracy = -1;

  	return &local->hw;

   err_free:
  	wiphy_free(wiphy);
  	return NULL;

  }

  EXPORT_SYMBOL(ieee80211_alloc_hw_nm);

  static int ieee80211_init_cipher_suites(struct ieee80211_local *local)

  {

  	bool have_wep = !(IS_ERR(local->wep_tx_tfm) ||
  			  IS_ERR(local->wep_rx_tfm));

  	bool have_mfp = ieee80211_hw_check(&local->hw, MFP_CAPABLE);

  	int n_suites = 0, r = 0, w = 0;
  	u32 *suites;

  	static const u32 cipher_suites[] = {

  		/* keep WEP first, it may be removed below */

  		WLAN_CIPHER_SUITE_WEP40,
  		WLAN_CIPHER_SUITE_WEP104,
  		WLAN_CIPHER_SUITE_TKIP,
  		WLAN_CIPHER_SUITE_CCMP,

  		WLAN_CIPHER_SUITE_CCMP_256,

  		WLAN_CIPHER_SUITE_GCMP,
  		WLAN_CIPHER_SUITE_GCMP_256,

  
  		/* keep last -- depends on hw flags! */

  		WLAN_CIPHER_SUITE_AES_CMAC,
  		WLAN_CIPHER_SUITE_BIP_CMAC_256,

  		WLAN_CIPHER_SUITE_BIP_GMAC_128,
  		WLAN_CIPHER_SUITE_BIP_GMAC_256,

  	};

  	if (ieee80211_hw_check(&local->hw, SW_CRYPTO_CONTROL) ||

  	    local->hw.wiphy->cipher_suites) {
  		/* If the driver advertises, or doesn't support SW crypto,
  		 * we only need to remove WEP if necessary.
  		 */
  		if (have_wep)
  			return 0;
  
  		/* well if it has _no_ ciphers ... fine */
  		if (!local->hw.wiphy->n_cipher_suites)
  			return 0;
  
  		/* Driver provides cipher suites, but we need to exclude WEP */
  		suites = kmemdup(local->hw.wiphy->cipher_suites,
  				 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
  				 GFP_KERNEL);
  		if (!suites)
  			return -ENOMEM;

  		for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
  			u32 suite = local->hw.wiphy->cipher_suites[r];
  
  			if (suite == WLAN_CIPHER_SUITE_WEP40 ||
  			    suite == WLAN_CIPHER_SUITE_WEP104)
  				continue;
  			suites[w++] = suite;
  		}
  	} else if (!local->hw.cipher_schemes) {
  		/* If the driver doesn't have cipher schemes, there's nothing
  		 * else to do other than assign the (software supported and
  		 * perhaps offloaded) cipher suites.
  		 */

  		local->hw.wiphy->cipher_suites = cipher_suites;
  		local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
  
  		if (!have_mfp)

  			local->hw.wiphy->n_cipher_suites -= 4;

  
  		if (!have_wep) {
  			local->hw.wiphy->cipher_suites += 2;
  			local->hw.wiphy->n_cipher_suites -= 2;
  		}

  		/* not dynamically allocated, so just return */

  		return 0;

  	} else {
  		const struct ieee80211_cipher_scheme *cs;

  		cs = local->hw.cipher_schemes;
  
  		/* Driver specifies cipher schemes only (but not cipher suites
  		 * including the schemes)
  		 *

  		 * We start counting ciphers defined by schemes, TKIP, CCMP,

  		 * CCMP-256, GCMP, and GCMP-256

  		 */

  		n_suites = local->hw.n_cipher_schemes + 5;

  
  		/* check if we have WEP40 and WEP104 */
  		if (have_wep)
  			n_suites += 2;

  		/* check if we have AES_CMAC, BIP-CMAC-256, BIP-GMAC-128,
  		 * BIP-GMAC-256
  		 */

  		if (have_mfp)

  			n_suites += 4;

  
  		suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
  		if (!suites)
  			return -ENOMEM;
  
  		suites[w++] = WLAN_CIPHER_SUITE_CCMP;

  		suites[w++] = WLAN_CIPHER_SUITE_CCMP_256;

  		suites[w++] = WLAN_CIPHER_SUITE_TKIP;

  		suites[w++] = WLAN_CIPHER_SUITE_GCMP;
  		suites[w++] = WLAN_CIPHER_SUITE_GCMP_256;

  
  		if (have_wep) {
  			suites[w++] = WLAN_CIPHER_SUITE_WEP40;
  			suites[w++] = WLAN_CIPHER_SUITE_WEP104;
  		}

  		if (have_mfp) {

  			suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;

  			suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;

  			suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_128;
  			suites[w++] = WLAN_CIPHER_SUITE_BIP_GMAC_256;

  		}

  		for (r = 0; r < local->hw.n_cipher_schemes; r++) {

  			suites[w++] = cs[r].cipher;

  			if (WARN_ON(cs[r].pn_len > IEEE80211_MAX_PN_LEN)) {
  				kfree(suites);

  				return -EINVAL;

  			}

  		}

  	}
  
  	local->hw.wiphy->cipher_suites = suites;
  	local->hw.wiphy->n_cipher_suites = w;
  	local->wiphy_ciphers_allocated = true;
  
  	return 0;
  }
  
  int ieee80211_register_hw(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	int result, i;

  	enum nl80211_band band;

  	int channels, max_bitrates;
  	bool supp_ht, supp_vht;
  	netdev_features_t feature_whitelist;
  	struct cfg80211_chan_def dflt_chandef = {};

  	if (ieee80211_hw_check(hw, QUEUE_CONTROL) &&

  	    (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
  	     local->hw.offchannel_tx_hw_queue >= local->hw.queues))
  		return -EINVAL;

  	if ((hw->wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
  	    (!local->ops->tdls_channel_switch ||

  	     !local->ops->tdls_cancel_channel_switch ||
  	     !local->ops->tdls_recv_channel_switch))

  		return -EOPNOTSUPP;

  	if (WARN_ON(ieee80211_hw_check(hw, SUPPORTS_TX_FRAG) &&
  		    !local->ops->set_frag_threshold))
  		return -EINVAL;

  	if (WARN_ON(local->hw.wiphy->interface_modes &
  			BIT(NL80211_IFTYPE_NAN) &&
  		    (!local->ops->start_nan || !local->ops->stop_nan)))
  		return -EINVAL;

  #ifdef CONFIG_PM

  	if (hw->wiphy->wowlan && (!local->ops->suspend || !local->ops->resume))

  		return -EINVAL;

  #endif

  	if (!local->use_chanctx) {
  		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
  			const struct ieee80211_iface_combination *comb;
  
  			comb = &local->hw.wiphy->iface_combinations[i];
  
  			if (comb->num_different_channels > 1)
  				return -EINVAL;
  		}

  	} else {

  		/*
  		 * WDS is currently prohibited when channel contexts are used
  		 * because there's no clear definition of which channel WDS
  		 * type interfaces use
  		 */
  		if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
  			return -EINVAL;

  		/* DFS is not supported with multi-channel combinations yet */

  		for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
  			const struct ieee80211_iface_combination *comb;
  
  			comb = &local->hw.wiphy->iface_combinations[i];

  			if (comb->radar_detect_widths &&
  			    comb->num_different_channels > 1)

  				return -EINVAL;
  		}

  	}

  	/* Only HW csum features are currently compatible with mac80211 */
  	feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |

  			    NETIF_F_HW_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |

  			    NETIF_F_GSO_SOFTWARE | NETIF_F_RXCSUM;

  	if (WARN_ON(hw->netdev_features & ~feature_whitelist))
  		return -EINVAL;

  	if (hw->max_report_rates == 0)
  		hw->max_report_rates = hw->max_rates;

  	local->rx_chains = 1;

  	/*
  	 * generic code guarantees at least one band,
  	 * set this very early because much code assumes
  	 * that hw.conf.channel is assigned
  	 */

  	channels = 0;

  	max_bitrates = 0;

  	supp_ht = false;

  	supp_vht = false;

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

  		struct ieee80211_supported_band *sband;
  
  		sband = local->hw.wiphy->bands[band];

  		if (!sband)
  			continue;

  
  		if (!dflt_chandef.chan) {
  			cfg80211_chandef_create(&dflt_chandef,
  						&sband->channels[0],
  						NL80211_CHAN_NO_HT);

  			/* init channel we're on */

  			if (!local->use_chanctx && !local->_oper_chandef.chan) {
  				local->hw.conf.chandef = dflt_chandef;
  				local->_oper_chandef = dflt_chandef;
  			}
  			local->monitor_chandef = dflt_chandef;

  		}

  		channels += sband->n_channels;
  
  		if (max_bitrates < sband->n_bitrates)
  			max_bitrates = sband->n_bitrates;

  		supp_ht = supp_ht || sband->ht_cap.ht_supported;

  		supp_vht = supp_vht || sband->vht_cap.vht_supported;

  		if (!sband->ht_cap.ht_supported)
  			continue;

  
  		/* TODO: consider VHT for RX chains, hopefully it's the same */

  		local->rx_chains =
  			max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
  			    local->rx_chains);
  
  		/* no need to mask, SM_PS_DISABLED has all bits set */
  		sband->ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
  			             IEEE80211_HT_CAP_SM_PS_SHIFT;

  	}

  	/* if low-level driver supports AP, we also support VLAN */

  	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
  		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
  		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
  	}

  
  	/* mac80211 always supports monitor */

  	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
  	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);

  	/* mac80211 doesn't support more than one IBSS interface right now */

  	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
  		const struct ieee80211_iface_combination *c;
  		int j;
  
  		c = &hw->wiphy->iface_combinations[i];

  		for (j = 0; j < c->n_limits; j++)
  			if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
  			    c->limits[j].max > 1)
  				return -EINVAL;
  	}

  	local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
  				      sizeof(void *) * channels, GFP_KERNEL);
  	if (!local->int_scan_req)
  		return -ENOMEM;

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

  		if (!local->hw.wiphy->bands[band])
  			continue;
  		local->int_scan_req->rates[band] = (u32) -1;
  	}

  #ifndef CONFIG_MAC80211_MESH
  	/* mesh depends on Kconfig, but drivers should set it if they want */
  	local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
  #endif

  	/* if the underlying driver supports mesh, mac80211 will (at least)
  	 * provide routing of mesh authentication frames to userspace */
  	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
  		local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;

  	/* mac80211 supports control port protocol changing */
  	local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;

  	if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) {

  		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;

  	} else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC)) {

  		local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;

  		if (hw->max_signal <= 0) {
  			result = -EINVAL;
  			goto fail_wiphy_register;
  		}
  	}

  	/*
  	 * Calculate scan IE length -- we need this to alloc
  	 * memory and to subtract from the driver limit. It

  	 * includes the DS Params, (extended) supported rates, and HT

  	 * information -- SSID is the driver's responsibility.
  	 */

  	local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
  		3 /* DS Params */;

  	if (supp_ht)
  		local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);

  	if (supp_vht)

  		local->scan_ies_len +=

  			2 + sizeof(struct ieee80211_vht_cap);

  	if (!local->ops->hw_scan) {
  		/* For hw_scan, driver needs to set these up. */
  		local->hw.wiphy->max_scan_ssids = 4;
  		local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
  	}
  
  	/*
  	 * If the driver supports any scan IEs, then assume the
  	 * limit includes the IEs mac80211 will add, otherwise
  	 * leave it at zero and let the driver sort it out; we
  	 * still pass our IEs to the driver but userspace will
  	 * not be allowed to in that case.
  	 */
  	if (local->hw.wiphy->max_scan_ie_len)
  		local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;

  	WARN_ON(!ieee80211_cs_list_valid(local->hw.cipher_schemes,
  					 local->hw.n_cipher_schemes));
  
  	result = ieee80211_init_cipher_suites(local);
  	if (result < 0)
  		goto fail_wiphy_register;

  	if (!local->ops->remain_on_channel)
  		local->hw.wiphy->max_remain_on_channel_duration = 5000;

  	/* mac80211 based drivers don't support internal TDLS setup */
  	if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
  		local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;

  	/* mac80211 supports eCSA, if the driver supports STA CSA at all */

  	if (ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA))

  		local->ext_capa[0] |= WLAN_EXT_CAPA1_EXT_CHANNEL_SWITCHING;

  	local->hw.wiphy->max_num_csa_counters = IEEE80211_MAX_CSA_COUNTERS_NUM;

  	result = wiphy_register(local->hw.wiphy);
  	if (result < 0)

  		goto fail_wiphy_register;

  	/*
  	 * We use the number of queues for feature tests (QoS, HT) internally
  	 * so restrict them appropriately.
  	 */

  	if (hw->queues > IEEE80211_MAX_QUEUES)
  		hw->queues = IEEE80211_MAX_QUEUES;

  	local->workqueue =

  		alloc_ordered_workqueue("%s", 0, wiphy_name(local->hw.wiphy));

  	if (!local->workqueue) {

  		result = -ENOMEM;
  		goto fail_workqueue;
  	}

  	/*
  	 * The hardware needs headroom for sending the frame,
  	 * and we need some headroom for passing the frame to monitor
  	 * interfaces, but never both at the same time.
  	 */

  	local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,

  				   IEEE80211_TX_STATUS_HEADROOM);

  	debugfs_hw_add(local);

  	/*
  	 * if the driver doesn't specify a max listen interval we
  	 * use 5 which should be a safe default
  	 */

  	if (local->hw.max_listen_interval == 0)

  		local->hw.max_listen_interval = 5;

  
  	local->hw.conf.listen_interval = local->hw.max_listen_interval;

  	local->dynamic_ps_forced_timeout = -1;

  	if (!local->hw.max_nan_de_entries)
  		local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;

  	result = ieee80211_wep_init(local);

  	if (result < 0)

  		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d
  ",
  			    result);

  	local->hw.conf.flags = IEEE80211_CONF_IDLE;

  	ieee80211_led_init(local);

  	rtnl_lock();

  	result = ieee80211_init_rate_ctrl_alg(local,
  					      hw->rate_control_algorithm);

  	if (result < 0) {

  		wiphy_debug(local->hw.wiphy,
  			    "Failed to initialize rate control algorithm
  ");

  		goto fail_rate;
  	}

  	/* add one default STA interface if supported */

  	if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION) &&

  	    !ieee80211_hw_check(hw, NO_AUTO_VIF)) {

  		result = ieee80211_if_add(local, "wlan%d", NET_NAME_ENUM, NULL,

  					  NL80211_IFTYPE_STATION, NULL);
  		if (result)

  			wiphy_warn(local->hw.wiphy,
  				   "Failed to add default virtual iface
  ");

  	}

  	rtnl_unlock();

  	result = ieee80211_txq_setup_flows(local);
  	if (result)
  		goto fail_flows;

  #ifdef CONFIG_INET

  	local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
  	result = register_inetaddr_notifier(&local->ifa_notifier);
  	if (result)
  		goto fail_ifa;

  #endif

  #if IS_ENABLED(CONFIG_IPV6)
  	local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
  	result = register_inet6addr_notifier(&local->ifa6_notifier);
  	if (result)
  		goto fail_ifa6;
  #endif

  	return 0;

  #if IS_ENABLED(CONFIG_IPV6)
   fail_ifa6:

  #ifdef CONFIG_INET

  	unregister_inetaddr_notifier(&local->ifa_notifier);
  #endif
  #endif
  #if defined(CONFIG_INET) || defined(CONFIG_IPV6)

   fail_ifa:

  #endif

  	ieee80211_txq_teardown_flows(local);
   fail_flows:

  	rtnl_lock();
  	rate_control_deinitialize(local);

  	ieee80211_remove_interfaces(local);

   fail_rate:

  	rtnl_unlock();

  	ieee80211_led_exit(local);

  	ieee80211_wep_free(local);

  	destroy_workqueue(local->workqueue);

   fail_workqueue:

  	wiphy_unregister(local->hw.wiphy);

   fail_wiphy_register:

  	if (local->wiphy_ciphers_allocated)
  		kfree(local->hw.wiphy->cipher_suites);

  	kfree(local->int_scan_req);

  	return result;
  }
  EXPORT_SYMBOL(ieee80211_register_hw);

  void ieee80211_unregister_hw(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);

  
  	tasklet_kill(&local->tx_pending_tasklet);
  	tasklet_kill(&local->tasklet);

  #ifdef CONFIG_INET

  	unregister_inetaddr_notifier(&local->ifa_notifier);

  #endif

  #if IS_ENABLED(CONFIG_IPV6)
  	unregister_inet6addr_notifier(&local->ifa6_notifier);
  #endif

  	ieee80211_txq_teardown_flows(local);

  	rtnl_lock();

  	/*
  	 * At this point, interface list manipulations are fine
  	 * because the driver cannot be handing us frames any
  	 * more and the tasklet is killed.
  	 */

  	ieee80211_remove_interfaces(local);

  	rtnl_unlock();

  	cancel_delayed_work_sync(&local->roc_work);

  	cancel_work_sync(&local->restart_work);

  	cancel_work_sync(&local->reconfig_filter);

  	cancel_work_sync(&local->tdls_chsw_work);

  	flush_work(&local->sched_scan_stopped_work);

  	flush_work(&local->radar_detected_work);

  	ieee80211_clear_tx_pending(local);

  	rate_control_deinitialize(local);

  	if (skb_queue_len(&local->skb_queue) ||
  	    skb_queue_len(&local->skb_queue_unreliable))

  		wiphy_warn(local->hw.wiphy, "skb_queue not empty
  ");

  	skb_queue_purge(&local->skb_queue);
  	skb_queue_purge(&local->skb_queue_unreliable);

  	skb_queue_purge(&local->skb_queue_tdls_chsw);

  	destroy_workqueue(local->workqueue);

  	wiphy_unregister(local->hw.wiphy);
  	ieee80211_wep_free(local);
  	ieee80211_led_exit(local);

  	kfree(local->int_scan_req);

  }
  EXPORT_SYMBOL(ieee80211_unregister_hw);

  static int ieee80211_free_ack_frame(int id, void *p, void *data)
  {
  	WARN_ONCE(1, "Have pending ack frames!
  ");
  	kfree_skb(p);
  	return 0;
  }

  void ieee80211_free_hw(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);

  	mutex_destroy(&local->iflist_mtx);

  	mutex_destroy(&local->mtx);

  	if (local->wiphy_ciphers_allocated)
  		kfree(local->hw.wiphy->cipher_suites);

  	idr_for_each(&local->ack_status_frames,
  		     ieee80211_free_ack_frame, NULL);
  	idr_destroy(&local->ack_status_frames);

  	sta_info_stop(local);

  	ieee80211_free_led_names(local);

  	wiphy_free(local->hw.wiphy);
  }
  EXPORT_SYMBOL(ieee80211_free_hw);

  static int __init ieee80211_init(void)
  {
  	struct sk_buff *skb;
  	int ret;

  	BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
  	BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +

  		     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));

  	ret = rc80211_minstrel_init();
  	if (ret)
  		return ret;

  	ret = rc80211_minstrel_ht_init();
  	if (ret)
  		goto err_minstrel;

  	ret = ieee80211_iface_init();
  	if (ret)
  		goto err_netdev;

  	return 0;

   err_netdev:

  	rc80211_minstrel_ht_exit();
   err_minstrel:

  	rc80211_minstrel_exit();
  
  	return ret;

  }

  static void __exit ieee80211_exit(void)
  {

  	rc80211_minstrel_ht_exit();

  	rc80211_minstrel_exit();

  	ieee80211s_stop();

  	ieee80211_iface_exit();

  
  	rcu_barrier();

  }

  subsys_initcall(ieee80211_init);

  module_exit(ieee80211_exit);
  
  MODULE_DESCRIPTION("IEEE 802.11 subsystem");
  MODULE_LICENSE("GPL");