text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright 2002-2005, Instant802 Networks, Inc.
   * Copyright 2005-2006, Devicescape Software, Inc.
   * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
   * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
   * Copyright 2013-2014  Intel Mobile Communications GmbH
   * Copyright (C) 2015-2017	Intel Deutschland GmbH
   * Copyright (C) 2018-2020 Intel Corporation
   *
   * utilities for mac80211
   */
  
  #include <net/mac80211.h>
  #include <linux/netdevice.h>
  #include <linux/export.h>
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <linux/skbuff.h>
  #include <linux/etherdevice.h>
  #include <linux/if_arp.h>
  #include <linux/bitmap.h>
  #include <linux/crc32.h>
  #include <net/net_namespace.h>
  #include <net/cfg80211.h>
  #include <net/rtnetlink.h>
  
  #include "ieee80211_i.h"
  #include "driver-ops.h"
  #include "rate.h"
  #include "mesh.h"
  #include "wme.h"
  #include "led.h"
  #include "wep.h"
  
  /* privid for wiphys to determine whether they belong to us or not */
  const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
  
  struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  {
  	struct ieee80211_local *local;
  
  	local = wiphy_priv(wiphy);
  	return &local->hw;
  }
  EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  
  u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  			enum nl80211_iftype type)
  {
  	__le16 fc = hdr->frame_control;
  
  	if (ieee80211_is_data(fc)) {
  		if (len < 24) /* drop incorrect hdr len (data) */
  			return NULL;
  
  		if (ieee80211_has_a4(fc))
  			return NULL;
  		if (ieee80211_has_tods(fc))
  			return hdr->addr1;
  		if (ieee80211_has_fromds(fc))
  			return hdr->addr2;
  
  		return hdr->addr3;
  	}
  
  	if (ieee80211_is_s1g_beacon(fc)) {
  		struct ieee80211_ext *ext = (void *) hdr;
  
  		return ext->u.s1g_beacon.sa;
  	}
  
  	if (ieee80211_is_mgmt(fc)) {
  		if (len < 24) /* drop incorrect hdr len (mgmt) */
  			return NULL;
  		return hdr->addr3;
  	}
  
  	if (ieee80211_is_ctl(fc)) {
  		if (ieee80211_is_pspoll(fc))
  			return hdr->addr1;
  
  		if (ieee80211_is_back_req(fc)) {
  			switch (type) {
  			case NL80211_IFTYPE_STATION:
  				return hdr->addr2;
  			case NL80211_IFTYPE_AP:
  			case NL80211_IFTYPE_AP_VLAN:
  				return hdr->addr1;
  			default:
  				break; /* fall through to the return */
  			}
  		}
  	}
  
  	return NULL;
  }
  EXPORT_SYMBOL(ieee80211_get_bssid);
  
  void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
  {
  	struct sk_buff *skb;
  	struct ieee80211_hdr *hdr;
  
  	skb_queue_walk(&tx->skbs, skb) {
  		hdr = (struct ieee80211_hdr *) skb->data;
  		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  	}
  }
  
  int ieee80211_frame_duration(enum nl80211_band band, size_t len,
  			     int rate, int erp, int short_preamble,
  			     int shift)
  {
  	int dur;
  
  	/* calculate duration (in microseconds, rounded up to next higher
  	 * integer if it includes a fractional microsecond) to send frame of
  	 * len bytes (does not include FCS) at the given rate. Duration will
  	 * also include SIFS.
  	 *
  	 * rate is in 100 kbps, so divident is multiplied by 10 in the
  	 * DIV_ROUND_UP() operations.
  	 *
  	 * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
  	 * is assumed to be 0 otherwise.
  	 */
  
  	if (band == NL80211_BAND_5GHZ || erp) {
  		/*
  		 * OFDM:
  		 *
  		 * N_DBPS = DATARATE x 4
  		 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
  		 *	(16 = SIGNAL time, 6 = tail bits)
  		 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
  		 *
  		 * T_SYM = 4 usec
  		 * 802.11a - 18.5.2: aSIFSTime = 16 usec
  		 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
  		 *	signal ext = 6 usec
  		 */
  		dur = 16; /* SIFS + signal ext */
  		dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
  		dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
  
  		/* IEEE 802.11-2012 18.3.2.4: all values above are:
  		 *  * times 4 for 5 MHz
  		 *  * times 2 for 10 MHz
  		 */
  		dur *= 1 << shift;
  
  		/* rates should already consider the channel bandwidth,
  		 * don't apply divisor again.
  		 */
  		dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
  					4 * rate); /* T_SYM x N_SYM */
  	} else {
  		/*
  		 * 802.11b or 802.11g with 802.11b compatibility:
  		 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
  		 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
  		 *
  		 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
  		 * aSIFSTime = 10 usec
  		 * aPreambleLength = 144 usec or 72 usec with short preamble
  		 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
  		 */
  		dur = 10; /* aSIFSTime = 10 usec */
  		dur += short_preamble ? (72 + 24) : (144 + 48);
  
  		dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
  	}
  
  	return dur;
  }
  
  /* Exported duration function for driver use */
  __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
  					struct ieee80211_vif *vif,
  					enum nl80211_band band,
  					size_t frame_len,
  					struct ieee80211_rate *rate)
  {
  	struct ieee80211_sub_if_data *sdata;
  	u16 dur;
  	int erp, shift = 0;
  	bool short_preamble = false;
  
  	erp = 0;
  	if (vif) {
  		sdata = vif_to_sdata(vif);
  		short_preamble = sdata->vif.bss_conf.use_short_preamble;
  		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
  			erp = rate->flags & IEEE80211_RATE_ERP_G;
  		shift = ieee80211_vif_get_shift(vif);
  	}
  
  	dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
  				       short_preamble, shift);
  
  	return cpu_to_le16(dur);
  }
  EXPORT_SYMBOL(ieee80211_generic_frame_duration);
  
  __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
  			      struct ieee80211_vif *vif, size_t frame_len,
  			      const struct ieee80211_tx_info *frame_txctl)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	struct ieee80211_rate *rate;
  	struct ieee80211_sub_if_data *sdata;
  	bool short_preamble;
  	int erp, shift = 0, bitrate;
  	u16 dur;
  	struct ieee80211_supported_band *sband;
  
  	sband = local->hw.wiphy->bands[frame_txctl->band];
  
  	short_preamble = false;
  
  	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
  
  	erp = 0;
  	if (vif) {
  		sdata = vif_to_sdata(vif);
  		short_preamble = sdata->vif.bss_conf.use_short_preamble;
  		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
  			erp = rate->flags & IEEE80211_RATE_ERP_G;
  		shift = ieee80211_vif_get_shift(vif);
  	}
  
  	bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
  
  	/* CTS duration */
  	dur = ieee80211_frame_duration(sband->band, 10, bitrate,
  				       erp, short_preamble, shift);
  	/* Data frame duration */
  	dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
  					erp, short_preamble, shift);
  	/* ACK duration */
  	dur += ieee80211_frame_duration(sband->band, 10, bitrate,
  					erp, short_preamble, shift);
  
  	return cpu_to_le16(dur);
  }
  EXPORT_SYMBOL(ieee80211_rts_duration);
  
  __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
  				    struct ieee80211_vif *vif,
  				    size_t frame_len,
  				    const struct ieee80211_tx_info *frame_txctl)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	struct ieee80211_rate *rate;
  	struct ieee80211_sub_if_data *sdata;
  	bool short_preamble;
  	int erp, shift = 0, bitrate;
  	u16 dur;
  	struct ieee80211_supported_band *sband;
  
  	sband = local->hw.wiphy->bands[frame_txctl->band];
  
  	short_preamble = false;
  
  	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
  	erp = 0;
  	if (vif) {
  		sdata = vif_to_sdata(vif);
  		short_preamble = sdata->vif.bss_conf.use_short_preamble;
  		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
  			erp = rate->flags & IEEE80211_RATE_ERP_G;
  		shift = ieee80211_vif_get_shift(vif);
  	}
  
  	bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
  
  	/* Data frame duration */
  	dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
  				       erp, short_preamble, shift);
  	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
  		/* ACK duration */
  		dur += ieee80211_frame_duration(sband->band, 10, bitrate,
  						erp, short_preamble, shift);
  	}
  
  	return cpu_to_le16(dur);
  }
  EXPORT_SYMBOL(ieee80211_ctstoself_duration);
  
  static void __ieee80211_wake_txqs(struct ieee80211_sub_if_data *sdata, int ac)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_vif *vif = &sdata->vif;
  	struct fq *fq = &local->fq;
  	struct ps_data *ps = NULL;
  	struct txq_info *txqi;
  	struct sta_info *sta;
  	int i;
  
  	local_bh_disable();
  	spin_lock(&fq->lock);
  
  	if (sdata->vif.type == NL80211_IFTYPE_AP)
  		ps = &sdata->bss->ps;
  
  	sdata->vif.txqs_stopped[ac] = false;
  
  	list_for_each_entry_rcu(sta, &local->sta_list, list) {
  		if (sdata != sta->sdata)
  			continue;
  
  		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
  			struct ieee80211_txq *txq = sta->sta.txq[i];
  
  			if (!txq)
  				continue;
  
  			txqi = to_txq_info(txq);
  
  			if (ac != txq->ac)
  				continue;
  
  			if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX,
  						&txqi->flags))
  				continue;
  
  			spin_unlock(&fq->lock);
  			drv_wake_tx_queue(local, txqi);
  			spin_lock(&fq->lock);
  		}
  	}
  
  	if (!vif->txq)
  		goto out;
  
  	txqi = to_txq_info(vif->txq);
  
  	if (!test_and_clear_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags) ||
  	    (ps && atomic_read(&ps->num_sta_ps)) || ac != vif->txq->ac)
  		goto out;
  
  	spin_unlock(&fq->lock);
  
  	drv_wake_tx_queue(local, txqi);
  	local_bh_enable();
  	return;
  out:
  	spin_unlock(&fq->lock);
  	local_bh_enable();
  }
  
  static void
  __releases(&local->queue_stop_reason_lock)
  __acquires(&local->queue_stop_reason_lock)
  _ieee80211_wake_txqs(struct ieee80211_local *local, unsigned long *flags)
  {
  	struct ieee80211_sub_if_data *sdata;
  	int n_acs = IEEE80211_NUM_ACS;
  	int i;
  
  	rcu_read_lock();
  
  	if (local->hw.queues < IEEE80211_NUM_ACS)
  		n_acs = 1;
  
  	for (i = 0; i < local->hw.queues; i++) {
  		if (local->queue_stop_reasons[i])
  			continue;
  
  		spin_unlock_irqrestore(&local->queue_stop_reason_lock, *flags);
  		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  			int ac;
  
  			for (ac = 0; ac < n_acs; ac++) {
  				int ac_queue = sdata->vif.hw_queue[ac];
  
  				if (ac_queue == i ||
  				    sdata->vif.cab_queue == i)
  					__ieee80211_wake_txqs(sdata, ac);
  			}
  		}
  		spin_lock_irqsave(&local->queue_stop_reason_lock, *flags);
  	}
  
  	rcu_read_unlock();
  }
  
  void ieee80211_wake_txqs(struct tasklet_struct *t)
  {
  	struct ieee80211_local *local = from_tasklet(local, t,
  						     wake_txqs_tasklet);
  	unsigned long flags;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	_ieee80211_wake_txqs(local, &flags);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
  {
  	struct ieee80211_sub_if_data *sdata;
  	int n_acs = IEEE80211_NUM_ACS;
  
  	if (local->ops->wake_tx_queue)
  		return;
  
  	if (local->hw.queues < IEEE80211_NUM_ACS)
  		n_acs = 1;
  
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		int ac;
  
  		if (!sdata->dev)
  			continue;
  
  		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
  		    local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
  			continue;
  
  		for (ac = 0; ac < n_acs; ac++) {
  			int ac_queue = sdata->vif.hw_queue[ac];
  
  			if (ac_queue == queue ||
  			    (sdata->vif.cab_queue == queue &&
  			     local->queue_stop_reasons[ac_queue] == 0 &&
  			     skb_queue_empty(&local->pending[ac_queue])))
  				netif_wake_subqueue(sdata->dev, ac);
  		}
  	}
  }
  
  static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
  				   enum queue_stop_reason reason,
  				   bool refcounted,
  				   unsigned long *flags)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	trace_wake_queue(local, queue, reason);
  
  	if (WARN_ON(queue >= hw->queues))
  		return;
  
  	if (!test_bit(reason, &local->queue_stop_reasons[queue]))
  		return;
  
  	if (!refcounted) {
  		local->q_stop_reasons[queue][reason] = 0;
  	} else {
  		local->q_stop_reasons[queue][reason]--;
  		if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
  			local->q_stop_reasons[queue][reason] = 0;
  	}
  
  	if (local->q_stop_reasons[queue][reason] == 0)
  		__clear_bit(reason, &local->queue_stop_reasons[queue]);
  
  	if (local->queue_stop_reasons[queue] != 0)
  		/* someone still has this queue stopped */
  		return;
  
  	if (skb_queue_empty(&local->pending[queue])) {
  		rcu_read_lock();
  		ieee80211_propagate_queue_wake(local, queue);
  		rcu_read_unlock();
  	} else
  		tasklet_schedule(&local->tx_pending_tasklet);
  
  	/*
  	 * Calling _ieee80211_wake_txqs here can be a problem because it may
  	 * release queue_stop_reason_lock which has been taken by
  	 * __ieee80211_wake_queue's caller. It is certainly not very nice to
  	 * release someone's lock, but it is fine because all the callers of
  	 * __ieee80211_wake_queue call it right before releasing the lock.
  	 */
  	if (local->ops->wake_tx_queue) {
  		if (reason == IEEE80211_QUEUE_STOP_REASON_DRIVER)
  			tasklet_schedule(&local->wake_txqs_tasklet);
  		else
  			_ieee80211_wake_txqs(local, flags);
  	}
  }
  
  void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
  				    enum queue_stop_reason reason,
  				    bool refcounted)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	unsigned long flags;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	__ieee80211_wake_queue(hw, queue, reason, refcounted, &flags);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
  {
  	ieee80211_wake_queue_by_reason(hw, queue,
  				       IEEE80211_QUEUE_STOP_REASON_DRIVER,
  				       false);
  }
  EXPORT_SYMBOL(ieee80211_wake_queue);
  
  static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
  				   enum queue_stop_reason reason,
  				   bool refcounted)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	struct ieee80211_sub_if_data *sdata;
  	int n_acs = IEEE80211_NUM_ACS;
  
  	trace_stop_queue(local, queue, reason);
  
  	if (WARN_ON(queue >= hw->queues))
  		return;
  
  	if (!refcounted)
  		local->q_stop_reasons[queue][reason] = 1;
  	else
  		local->q_stop_reasons[queue][reason]++;
  
  	if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
  		return;
  
  	if (local->hw.queues < IEEE80211_NUM_ACS)
  		n_acs = 1;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		int ac;
  
  		if (!sdata->dev)
  			continue;
  
  		for (ac = 0; ac < n_acs; ac++) {
  			if (sdata->vif.hw_queue[ac] == queue ||
  			    sdata->vif.cab_queue == queue) {
  				if (!local->ops->wake_tx_queue) {
  					netif_stop_subqueue(sdata->dev, ac);
  					continue;
  				}
  				spin_lock(&local->fq.lock);
  				sdata->vif.txqs_stopped[ac] = true;
  				spin_unlock(&local->fq.lock);
  			}
  		}
  	}
  	rcu_read_unlock();
  }
  
  void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
  				    enum queue_stop_reason reason,
  				    bool refcounted)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	unsigned long flags;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	__ieee80211_stop_queue(hw, queue, reason, refcounted);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
  {
  	ieee80211_stop_queue_by_reason(hw, queue,
  				       IEEE80211_QUEUE_STOP_REASON_DRIVER,
  				       false);
  }
  EXPORT_SYMBOL(ieee80211_stop_queue);
  
  void ieee80211_add_pending_skb(struct ieee80211_local *local,
  			       struct sk_buff *skb)
  {
  	struct ieee80211_hw *hw = &local->hw;
  	unsigned long flags;
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  	int queue = info->hw_queue;
  
  	if (WARN_ON(!info->control.vif)) {
  		ieee80211_free_txskb(&local->hw, skb);
  		return;
  	}
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
  			       false);
  	__skb_queue_tail(&local->pending[queue], skb);
  	__ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
  			       false, &flags);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_add_pending_skbs(struct ieee80211_local *local,
  				struct sk_buff_head *skbs)
  {
  	struct ieee80211_hw *hw = &local->hw;
  	struct sk_buff *skb;
  	unsigned long flags;
  	int queue, i;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	while ((skb = skb_dequeue(skbs))) {
  		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  
  		if (WARN_ON(!info->control.vif)) {
  			ieee80211_free_txskb(&local->hw, skb);
  			continue;
  		}
  
  		queue = info->hw_queue;
  
  		__ieee80211_stop_queue(hw, queue,
  				IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
  				false);
  
  		__skb_queue_tail(&local->pending[queue], skb);
  	}
  
  	for (i = 0; i < hw->queues; i++)
  		__ieee80211_wake_queue(hw, i,
  			IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
  			false, &flags);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
  				     unsigned long queues,
  				     enum queue_stop_reason reason,
  				     bool refcounted)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	unsigned long flags;
  	int i;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  
  	for_each_set_bit(i, &queues, hw->queues)
  		__ieee80211_stop_queue(hw, i, reason, refcounted);
  
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_stop_queues(struct ieee80211_hw *hw)
  {
  	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
  					IEEE80211_QUEUE_STOP_REASON_DRIVER,
  					false);
  }
  EXPORT_SYMBOL(ieee80211_stop_queues);
  
  int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	unsigned long flags;
  	int ret;
  
  	if (WARN_ON(queue >= hw->queues))
  		return true;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  	ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
  		       &local->queue_stop_reasons[queue]);
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  	return ret;
  }
  EXPORT_SYMBOL(ieee80211_queue_stopped);
  
  void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
  				     unsigned long queues,
  				     enum queue_stop_reason reason,
  				     bool refcounted)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  	unsigned long flags;
  	int i;
  
  	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
  
  	for_each_set_bit(i, &queues, hw->queues)
  		__ieee80211_wake_queue(hw, i, reason, refcounted, &flags);
  
  	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
  }
  
  void ieee80211_wake_queues(struct ieee80211_hw *hw)
  {
  	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
  					IEEE80211_QUEUE_STOP_REASON_DRIVER,
  					false);
  }
  EXPORT_SYMBOL(ieee80211_wake_queues);
  
  static unsigned int
  ieee80211_get_vif_queues(struct ieee80211_local *local,
  			 struct ieee80211_sub_if_data *sdata)
  {
  	unsigned int queues;
  
  	if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
  		int ac;
  
  		queues = 0;
  
  		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
  			queues |= BIT(sdata->vif.hw_queue[ac]);
  		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
  			queues |= BIT(sdata->vif.cab_queue);
  	} else {
  		/* all queues */
  		queues = BIT(local->hw.queues) - 1;
  	}
  
  	return queues;
  }
  
  void __ieee80211_flush_queues(struct ieee80211_local *local,
  			      struct ieee80211_sub_if_data *sdata,
  			      unsigned int queues, bool drop)
  {
  	if (!local->ops->flush)
  		return;
  
  	/*
  	 * If no queue was set, or if the HW doesn't support
  	 * IEEE80211_HW_QUEUE_CONTROL - flush all queues
  	 */
  	if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
  		queues = ieee80211_get_vif_queues(local, sdata);
  
  	ieee80211_stop_queues_by_reason(&local->hw, queues,
  					IEEE80211_QUEUE_STOP_REASON_FLUSH,
  					false);
  
  	drv_flush(local, sdata, queues, drop);
  
  	ieee80211_wake_queues_by_reason(&local->hw, queues,
  					IEEE80211_QUEUE_STOP_REASON_FLUSH,
  					false);
  }
  
  void ieee80211_flush_queues(struct ieee80211_local *local,
  			    struct ieee80211_sub_if_data *sdata, bool drop)
  {
  	__ieee80211_flush_queues(local, sdata, 0, drop);
  }
  
  void ieee80211_stop_vif_queues(struct ieee80211_local *local,
  			       struct ieee80211_sub_if_data *sdata,
  			       enum queue_stop_reason reason)
  {
  	ieee80211_stop_queues_by_reason(&local->hw,
  					ieee80211_get_vif_queues(local, sdata),
  					reason, true);
  }
  
  void ieee80211_wake_vif_queues(struct ieee80211_local *local,
  			       struct ieee80211_sub_if_data *sdata,
  			       enum queue_stop_reason reason)
  {
  	ieee80211_wake_queues_by_reason(&local->hw,
  					ieee80211_get_vif_queues(local, sdata),
  					reason, true);
  }
  
  static void __iterate_interfaces(struct ieee80211_local *local,
  				 u32 iter_flags,
  				 void (*iterator)(void *data, u8 *mac,
  						  struct ieee80211_vif *vif),
  				 void *data)
  {
  	struct ieee80211_sub_if_data *sdata;
  	bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
  
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		switch (sdata->vif.type) {
  		case NL80211_IFTYPE_MONITOR:
  			if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
  				continue;
  			break;
  		case NL80211_IFTYPE_AP_VLAN:
  			continue;
  		default:
  			break;
  		}
  		if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
  		    active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
  			continue;
  		if ((iter_flags & IEEE80211_IFACE_SKIP_SDATA_NOT_IN_DRIVER) &&
  		    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
  			continue;
  		if (ieee80211_sdata_running(sdata) || !active_only)
  			iterator(data, sdata->vif.addr,
  				 &sdata->vif);
  	}
  
  	sdata = rcu_dereference_check(local->monitor_sdata,
  				      lockdep_is_held(&local->iflist_mtx) ||
  				      lockdep_rtnl_is_held());
  	if (sdata &&
  	    (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
  	     sdata->flags & IEEE80211_SDATA_IN_DRIVER))
  		iterator(data, sdata->vif.addr, &sdata->vif);
  }
  
  void ieee80211_iterate_interfaces(
  	struct ieee80211_hw *hw, u32 iter_flags,
  	void (*iterator)(void *data, u8 *mac,
  			 struct ieee80211_vif *vif),
  	void *data)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	mutex_lock(&local->iflist_mtx);
  	__iterate_interfaces(local, iter_flags, iterator, data);
  	mutex_unlock(&local->iflist_mtx);
  }
  EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
  
  void ieee80211_iterate_active_interfaces_atomic(
  	struct ieee80211_hw *hw, u32 iter_flags,
  	void (*iterator)(void *data, u8 *mac,
  			 struct ieee80211_vif *vif),
  	void *data)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	rcu_read_lock();
  	__iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
  			     iterator, data);
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
  
  void ieee80211_iterate_active_interfaces_mtx(
  	struct ieee80211_hw *hw, u32 iter_flags,
  	void (*iterator)(void *data, u8 *mac,
  			 struct ieee80211_vif *vif),
  	void *data)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	lockdep_assert_wiphy(hw->wiphy);
  
  	__iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
  			     iterator, data);
  }
  EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_mtx);
  
  static void __iterate_stations(struct ieee80211_local *local,
  			       void (*iterator)(void *data,
  						struct ieee80211_sta *sta),
  			       void *data)
  {
  	struct sta_info *sta;
  
  	list_for_each_entry_rcu(sta, &local->sta_list, list) {
  		if (!sta->uploaded)
  			continue;
  
  		iterator(data, &sta->sta);
  	}
  }
  
  void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
  			void (*iterator)(void *data,
  					 struct ieee80211_sta *sta),
  			void *data)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	rcu_read_lock();
  	__iterate_stations(local, iterator, data);
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
  
  struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
  {
  	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
  
  	if (!ieee80211_sdata_running(sdata) ||
  	    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
  		return NULL;
  	return &sdata->vif;
  }
  EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
  
  struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
  {
  	if (!vif)
  		return NULL;
  
  	return &vif_to_sdata(vif)->wdev;
  }
  EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
  
  /*
   * Nothing should have been stuffed into the workqueue during
   * the suspend->resume cycle. Since we can't check each caller
   * of this function if we are already quiescing / suspended,
   * check here and don't WARN since this can actually happen when
   * the rx path (for example) is racing against __ieee80211_suspend
   * and suspending / quiescing was set after the rx path checked
   * them.
   */
  static bool ieee80211_can_queue_work(struct ieee80211_local *local)
  {
  	if (local->quiescing || (local->suspended && !local->resuming)) {
  		pr_warn("queueing ieee80211 work while going to suspend\n");
  		return false;
  	}
  
  	return true;
  }
  
  void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	if (!ieee80211_can_queue_work(local))
  		return;
  
  	queue_work(local->workqueue, work);
  }
  EXPORT_SYMBOL(ieee80211_queue_work);
  
  void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
  				  struct delayed_work *dwork,
  				  unsigned long delay)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	if (!ieee80211_can_queue_work(local))
  		return;
  
  	queue_delayed_work(local->workqueue, dwork, delay);
  }
  EXPORT_SYMBOL(ieee80211_queue_delayed_work);
  
  static void ieee80211_parse_extension_element(u32 *crc,
  					      const struct element *elem,
  					      struct ieee802_11_elems *elems)
  {
  	const void *data = elem->data + 1;
  	u8 len = elem->datalen - 1;
  
  	switch (elem->data[0]) {
  	case WLAN_EID_EXT_HE_MU_EDCA:
  		if (len >= sizeof(*elems->mu_edca_param_set)) {
  			elems->mu_edca_param_set = data;
  			if (crc)
  				*crc = crc32_be(*crc, (void *)elem,
  						elem->datalen + 2);
  		}
  		break;
  	case WLAN_EID_EXT_HE_CAPABILITY:
  		elems->he_cap = data;
  		elems->he_cap_len = len;
  		break;
  	case WLAN_EID_EXT_HE_OPERATION:
  		if (len >= sizeof(*elems->he_operation) &&
  		    len >= ieee80211_he_oper_size(data) - 1) {
  			if (crc)
  				*crc = crc32_be(*crc, (void *)elem,
  						elem->datalen + 2);
  			elems->he_operation = data;
  		}
  		break;
  	case WLAN_EID_EXT_UORA:
  		if (len >= 1)
  			elems->uora_element = data;
  		break;
  	case WLAN_EID_EXT_MAX_CHANNEL_SWITCH_TIME:
  		if (len == 3)
  			elems->max_channel_switch_time = data;
  		break;
  	case WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION:
  		if (len >= sizeof(*elems->mbssid_config_ie))
  			elems->mbssid_config_ie = data;
  		break;
  	case WLAN_EID_EXT_HE_SPR:
  		if (len >= sizeof(*elems->he_spr) &&
  		    len >= ieee80211_he_spr_size(data))
  			elems->he_spr = data;
  		break;
  	case WLAN_EID_EXT_HE_6GHZ_CAPA:
  		if (len >= sizeof(*elems->he_6ghz_capa))
  			elems->he_6ghz_capa = data;
  		break;
  	}
  }
  
  static u32
  _ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
  			    struct ieee802_11_elems *elems,
  			    u64 filter, u32 crc,
  			    const struct element *check_inherit)
  {
  	const struct element *elem;
  	bool calc_crc = filter != 0;
  	DECLARE_BITMAP(seen_elems, 256);
  	const u8 *ie;
  
  	bitmap_zero(seen_elems, 256);
  
  	for_each_element(elem, start, len) {
  		bool elem_parse_failed;
  		u8 id = elem->id;
  		u8 elen = elem->datalen;
  		const u8 *pos = elem->data;
  
  		if (check_inherit &&
  		    !cfg80211_is_element_inherited(elem,
  						   check_inherit))
  			continue;
  
  		switch (id) {
  		case WLAN_EID_SSID:
  		case WLAN_EID_SUPP_RATES:
  		case WLAN_EID_FH_PARAMS:
  		case WLAN_EID_DS_PARAMS:
  		case WLAN_EID_CF_PARAMS:
  		case WLAN_EID_TIM:
  		case WLAN_EID_IBSS_PARAMS:
  		case WLAN_EID_CHALLENGE:
  		case WLAN_EID_RSN:
  		case WLAN_EID_ERP_INFO:
  		case WLAN_EID_EXT_SUPP_RATES:
  		case WLAN_EID_HT_CAPABILITY:
  		case WLAN_EID_HT_OPERATION:
  		case WLAN_EID_VHT_CAPABILITY:
  		case WLAN_EID_VHT_OPERATION:
  		case WLAN_EID_MESH_ID:
  		case WLAN_EID_MESH_CONFIG:
  		case WLAN_EID_PEER_MGMT:
  		case WLAN_EID_PREQ:
  		case WLAN_EID_PREP:
  		case WLAN_EID_PERR:
  		case WLAN_EID_RANN:
  		case WLAN_EID_CHANNEL_SWITCH:
  		case WLAN_EID_EXT_CHANSWITCH_ANN:
  		case WLAN_EID_COUNTRY:
  		case WLAN_EID_PWR_CONSTRAINT:
  		case WLAN_EID_TIMEOUT_INTERVAL:
  		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
  		case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
  		case WLAN_EID_CHAN_SWITCH_PARAM:
  		case WLAN_EID_EXT_CAPABILITY:
  		case WLAN_EID_CHAN_SWITCH_TIMING:
  		case WLAN_EID_LINK_ID:
  		case WLAN_EID_BSS_MAX_IDLE_PERIOD:
  		case WLAN_EID_RSNX:
  		case WLAN_EID_S1G_BCN_COMPAT:
  		case WLAN_EID_S1G_CAPABILITIES:
  		case WLAN_EID_S1G_OPERATION:
  		case WLAN_EID_AID_RESPONSE:
  		case WLAN_EID_S1G_SHORT_BCN_INTERVAL:
  		/*
  		 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
  		 * that if the content gets bigger it might be needed more than once
  		 */
  			if (test_bit(id, seen_elems)) {
  				elems->parse_error = true;
  				continue;
  			}
  			break;
  		}
  
  		if (calc_crc && id < 64 && (filter & (1ULL << id)))
  			crc = crc32_be(crc, pos - 2, elen + 2);
  
  		elem_parse_failed = false;
  
  		switch (id) {
  		case WLAN_EID_LINK_ID:
  			if (elen + 2 < sizeof(struct ieee80211_tdls_lnkie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->lnk_id = (void *)(pos - 2);
  			break;
  		case WLAN_EID_CHAN_SWITCH_TIMING:
  			if (elen < sizeof(struct ieee80211_ch_switch_timing)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->ch_sw_timing = (void *)pos;
  			break;
  		case WLAN_EID_EXT_CAPABILITY:
  			elems->ext_capab = pos;
  			elems->ext_capab_len = elen;
  			break;
  		case WLAN_EID_SSID:
  			elems->ssid = pos;
  			elems->ssid_len = elen;
  			break;
  		case WLAN_EID_SUPP_RATES:
  			elems->supp_rates = pos;
  			elems->supp_rates_len = elen;
  			break;
  		case WLAN_EID_DS_PARAMS:
  			if (elen >= 1)
  				elems->ds_params = pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_TIM:
  			if (elen >= sizeof(struct ieee80211_tim_ie)) {
  				elems->tim = (void *)pos;
  				elems->tim_len = elen;
  			} else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_CHALLENGE:
  			elems->challenge = pos;
  			elems->challenge_len = elen;
  			break;
  		case WLAN_EID_VENDOR_SPECIFIC:
  			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
  			    pos[2] == 0xf2) {
  				/* Microsoft OUI (00:50:F2) */
  
  				if (calc_crc)
  					crc = crc32_be(crc, pos - 2, elen + 2);
  
  				if (elen >= 5 && pos[3] == 2) {
  					/* OUI Type 2 - WMM IE */
  					if (pos[4] == 0) {
  						elems->wmm_info = pos;
  						elems->wmm_info_len = elen;
  					} else if (pos[4] == 1) {
  						elems->wmm_param = pos;
  						elems->wmm_param_len = elen;
  					}
  				}
  			}
  			break;
  		case WLAN_EID_RSN:
  			elems->rsn = pos;
  			elems->rsn_len = elen;
  			break;
  		case WLAN_EID_ERP_INFO:
  			if (elen >= 1)
  				elems->erp_info = pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_EXT_SUPP_RATES:
  			elems->ext_supp_rates = pos;
  			elems->ext_supp_rates_len = elen;
  			break;
  		case WLAN_EID_HT_CAPABILITY:
  			if (elen >= sizeof(struct ieee80211_ht_cap))
  				elems->ht_cap_elem = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_HT_OPERATION:
  			if (elen >= sizeof(struct ieee80211_ht_operation))
  				elems->ht_operation = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_VHT_CAPABILITY:
  			if (elen >= sizeof(struct ieee80211_vht_cap))
  				elems->vht_cap_elem = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_VHT_OPERATION:
  			if (elen >= sizeof(struct ieee80211_vht_operation)) {
  				elems->vht_operation = (void *)pos;
  				if (calc_crc)
  					crc = crc32_be(crc, pos - 2, elen + 2);
  				break;
  			}
  			elem_parse_failed = true;
  			break;
  		case WLAN_EID_OPMODE_NOTIF:
  			if (elen > 0) {
  				elems->opmode_notif = pos;
  				if (calc_crc)
  					crc = crc32_be(crc, pos - 2, elen + 2);
  				break;
  			}
  			elem_parse_failed = true;
  			break;
  		case WLAN_EID_MESH_ID:
  			elems->mesh_id = pos;
  			elems->mesh_id_len = elen;
  			break;
  		case WLAN_EID_MESH_CONFIG:
  			if (elen >= sizeof(struct ieee80211_meshconf_ie))
  				elems->mesh_config = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_PEER_MGMT:
  			elems->peering = pos;
  			elems->peering_len = elen;
  			break;
  		case WLAN_EID_MESH_AWAKE_WINDOW:
  			if (elen >= 2)
  				elems->awake_window = (void *)pos;
  			break;
  		case WLAN_EID_PREQ:
  			elems->preq = pos;
  			elems->preq_len = elen;
  			break;
  		case WLAN_EID_PREP:
  			elems->prep = pos;
  			elems->prep_len = elen;
  			break;
  		case WLAN_EID_PERR:
  			elems->perr = pos;
  			elems->perr_len = elen;
  			break;
  		case WLAN_EID_RANN:
  			if (elen >= sizeof(struct ieee80211_rann_ie))
  				elems->rann = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_CHANNEL_SWITCH:
  			if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->ch_switch_ie = (void *)pos;
  			break;
  		case WLAN_EID_EXT_CHANSWITCH_ANN:
  			if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->ext_chansw_ie = (void *)pos;
  			break;
  		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
  			if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->sec_chan_offs = (void *)pos;
  			break;
  		case WLAN_EID_CHAN_SWITCH_PARAM:
  			if (elen <
  			    sizeof(*elems->mesh_chansw_params_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->mesh_chansw_params_ie = (void *)pos;
  			break;
  		case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
  			if (!action ||
  			    elen < sizeof(*elems->wide_bw_chansw_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->wide_bw_chansw_ie = (void *)pos;
  			break;
  		case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
  			if (action) {
  				elem_parse_failed = true;
  				break;
  			}
  			/*
  			 * This is a bit tricky, but as we only care about
  			 * the wide bandwidth channel switch element, so
  			 * just parse it out manually.
  			 */
  			ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
  					      pos, elen);
  			if (ie) {
  				if (ie[1] >= sizeof(*elems->wide_bw_chansw_ie))
  					elems->wide_bw_chansw_ie =
  						(void *)(ie + 2);
  				else
  					elem_parse_failed = true;
  			}
  			break;
  		case WLAN_EID_COUNTRY:
  			elems->country_elem = pos;
  			elems->country_elem_len = elen;
  			break;
  		case WLAN_EID_PWR_CONSTRAINT:
  			if (elen != 1) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->pwr_constr_elem = pos;
  			break;
  		case WLAN_EID_CISCO_VENDOR_SPECIFIC:
  			/* Lots of different options exist, but we only care
  			 * about the Dynamic Transmit Power Control element.
  			 * First check for the Cisco OUI, then for the DTPC
  			 * tag (0x00).
  			 */
  			if (elen < 4) {
  				elem_parse_failed = true;
  				break;
  			}
  
  			if (pos[0] != 0x00 || pos[1] != 0x40 ||
  			    pos[2] != 0x96 || pos[3] != 0x00)
  				break;
  
  			if (elen != 6) {
  				elem_parse_failed = true;
  				break;
  			}
  
  			if (calc_crc)
  				crc = crc32_be(crc, pos - 2, elen + 2);
  
  			elems->cisco_dtpc_elem = pos;
  			break;
  		case WLAN_EID_ADDBA_EXT:
  			if (elen < sizeof(struct ieee80211_addba_ext_ie)) {
  				elem_parse_failed = true;
  				break;
  			}
  			elems->addba_ext_ie = (void *)pos;
  			break;
  		case WLAN_EID_TIMEOUT_INTERVAL:
  			if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
  				elems->timeout_int = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_BSS_MAX_IDLE_PERIOD:
  			if (elen >= sizeof(*elems->max_idle_period_ie))
  				elems->max_idle_period_ie = (void *)pos;
  			break;
  		case WLAN_EID_RSNX:
  			elems->rsnx = pos;
  			elems->rsnx_len = elen;
  			break;
  		case WLAN_EID_EXTENSION:
  			ieee80211_parse_extension_element(calc_crc ?
  								&crc : NULL,
  							  elem, elems);
  			break;
  		case WLAN_EID_S1G_CAPABILITIES:
  			if (elen >= sizeof(*elems->s1g_capab))
  				elems->s1g_capab = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_S1G_OPERATION:
  			if (elen == sizeof(*elems->s1g_oper))
  				elems->s1g_oper = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_S1G_BCN_COMPAT:
  			if (elen == sizeof(*elems->s1g_bcn_compat))
  				elems->s1g_bcn_compat = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		case WLAN_EID_AID_RESPONSE:
  			if (elen == sizeof(struct ieee80211_aid_response_ie))
  				elems->aid_resp = (void *)pos;
  			else
  				elem_parse_failed = true;
  			break;
  		default:
  			break;
  		}
  
  		if (elem_parse_failed)
  			elems->parse_error = true;
  		else
  			__set_bit(id, seen_elems);
  	}
  
  	if (!for_each_element_completed(elem, start, len))
  		elems->parse_error = true;
  
  	return crc;
  }
  
  static size_t ieee802_11_find_bssid_profile(const u8 *start, size_t len,
  					    struct ieee802_11_elems *elems,
  					    u8 *transmitter_bssid,
  					    u8 *bss_bssid,
  					    u8 *nontransmitted_profile)
  {
  	const struct element *elem, *sub;
  	size_t profile_len = 0;
  	bool found = false;
  
  	if (!bss_bssid || !transmitter_bssid)
  		return profile_len;
  
  	for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
  		if (elem->datalen < 2)
  			continue;
  
  		for_each_element(sub, elem->data + 1, elem->datalen - 1) {
  			u8 new_bssid[ETH_ALEN];
  			const u8 *index;
  
  			if (sub->id != 0 || sub->datalen < 4) {
  				/* not a valid BSS profile */
  				continue;
  			}
  
  			if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
  			    sub->data[1] != 2) {
  				/* The first element of the
  				 * Nontransmitted BSSID Profile is not
  				 * the Nontransmitted BSSID Capability
  				 * element.
  				 */
  				continue;
  			}
  
  			memset(nontransmitted_profile, 0, len);
  			profile_len = cfg80211_merge_profile(start, len,
  							     elem,
  							     sub,
  							     nontransmitted_profile,
  							     len);
  
  			/* found a Nontransmitted BSSID Profile */
  			index = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX,
  						 nontransmitted_profile,
  						 profile_len);
  			if (!index || index[1] < 1 || index[2] == 0) {
  				/* Invalid MBSSID Index element */
  				continue;
  			}
  
  			cfg80211_gen_new_bssid(transmitter_bssid,
  					       elem->data[0],
  					       index[2],
  					       new_bssid);
  			if (ether_addr_equal(new_bssid, bss_bssid)) {
  				found = true;
  				elems->bssid_index_len = index[1];
  				elems->bssid_index = (void *)&index[2];
  				break;
  			}
  		}
  	}
  
  	return found ? profile_len : 0;
  }
  
  u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
  			       struct ieee802_11_elems *elems,
  			       u64 filter, u32 crc, u8 *transmitter_bssid,
  			       u8 *bss_bssid)
  {
  	const struct element *non_inherit = NULL;
  	u8 *nontransmitted_profile;
  	int nontransmitted_profile_len = 0;
  
  	memset(elems, 0, sizeof(*elems));
  	elems->ie_start = start;
  	elems->total_len = len;
  
  	nontransmitted_profile = kmalloc(len, GFP_ATOMIC);
  	if (nontransmitted_profile) {
  		nontransmitted_profile_len =
  			ieee802_11_find_bssid_profile(start, len, elems,
  						      transmitter_bssid,
  						      bss_bssid,
  						      nontransmitted_profile);
  		non_inherit =
  			cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
  					       nontransmitted_profile,
  					       nontransmitted_profile_len);
  	}
  
  	crc = _ieee802_11_parse_elems_crc(start, len, action, elems, filter,
  					  crc, non_inherit);
  
  	/* Override with nontransmitted profile, if found */
  	if (nontransmitted_profile_len)
  		_ieee802_11_parse_elems_crc(nontransmitted_profile,
  					    nontransmitted_profile_len,
  					    action, elems, 0, 0, NULL);
  
  	if (elems->tim && !elems->parse_error) {
  		const struct ieee80211_tim_ie *tim_ie = elems->tim;
  
  		elems->dtim_period = tim_ie->dtim_period;
  		elems->dtim_count = tim_ie->dtim_count;
  	}
  
  	/* Override DTIM period and count if needed */
  	if (elems->bssid_index &&
  	    elems->bssid_index_len >=
  	    offsetofend(struct ieee80211_bssid_index, dtim_period))
  		elems->dtim_period = elems->bssid_index->dtim_period;
  
  	if (elems->bssid_index &&
  	    elems->bssid_index_len >=
  	    offsetofend(struct ieee80211_bssid_index, dtim_count))
  		elems->dtim_count = elems->bssid_index->dtim_count;
  
  	kfree(nontransmitted_profile);
  
  	return crc;
  }
  
  void ieee80211_regulatory_limit_wmm_params(struct ieee80211_sub_if_data *sdata,
  					   struct ieee80211_tx_queue_params
  					   *qparam, int ac)
  {
  	struct ieee80211_chanctx_conf *chanctx_conf;
  	const struct ieee80211_reg_rule *rrule;
  	const struct ieee80211_wmm_ac *wmm_ac;
  	u16 center_freq = 0;
  
  	if (sdata->vif.type != NL80211_IFTYPE_AP &&
  	    sdata->vif.type != NL80211_IFTYPE_STATION)
  		return;
  
  	rcu_read_lock();
  	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  	if (chanctx_conf)
  		center_freq = chanctx_conf->def.chan->center_freq;
  
  	if (!center_freq) {
  		rcu_read_unlock();
  		return;
  	}
  
  	rrule = freq_reg_info(sdata->wdev.wiphy, MHZ_TO_KHZ(center_freq));
  
  	if (IS_ERR_OR_NULL(rrule) || !rrule->has_wmm) {
  		rcu_read_unlock();
  		return;
  	}
  
  	if (sdata->vif.type == NL80211_IFTYPE_AP)
  		wmm_ac = &rrule->wmm_rule.ap[ac];
  	else
  		wmm_ac = &rrule->wmm_rule.client[ac];
  	qparam->cw_min = max_t(u16, qparam->cw_min, wmm_ac->cw_min);
  	qparam->cw_max = max_t(u16, qparam->cw_max, wmm_ac->cw_max);
  	qparam->aifs = max_t(u8, qparam->aifs, wmm_ac->aifsn);
  	qparam->txop = min_t(u16, qparam->txop, wmm_ac->cot / 32);
  	rcu_read_unlock();
  }
  
  void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
  			       bool bss_notify, bool enable_qos)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_tx_queue_params qparam;
  	struct ieee80211_chanctx_conf *chanctx_conf;
  	int ac;
  	bool use_11b;
  	bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
  	int aCWmin, aCWmax;
  
  	if (!local->ops->conf_tx)
  		return;
  
  	if (local->hw.queues < IEEE80211_NUM_ACS)
  		return;
  
  	memset(&qparam, 0, sizeof(qparam));
  
  	rcu_read_lock();
  	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  	use_11b = (chanctx_conf &&
  		   chanctx_conf->def.chan->band == NL80211_BAND_2GHZ) &&
  		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
  	rcu_read_unlock();
  
  	is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
  
  	/* Set defaults according to 802.11-2007 Table 7-37 */
  	aCWmax = 1023;
  	if (use_11b)
  		aCWmin = 31;
  	else
  		aCWmin = 15;
  
  	/* Confiure old 802.11b/g medium access rules. */
  	qparam.cw_max = aCWmax;
  	qparam.cw_min = aCWmin;
  	qparam.txop = 0;
  	qparam.aifs = 2;
  
  	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
  		/* Update if QoS is enabled. */
  		if (enable_qos) {
  			switch (ac) {
  			case IEEE80211_AC_BK:
  				qparam.cw_max = aCWmax;
  				qparam.cw_min = aCWmin;
  				qparam.txop = 0;
  				if (is_ocb)
  					qparam.aifs = 9;
  				else
  					qparam.aifs = 7;
  				break;
  			/* never happens but let's not leave undefined */
  			default:
  			case IEEE80211_AC_BE:
  				qparam.cw_max = aCWmax;
  				qparam.cw_min = aCWmin;
  				qparam.txop = 0;
  				if (is_ocb)
  					qparam.aifs = 6;
  				else
  					qparam.aifs = 3;
  				break;
  			case IEEE80211_AC_VI:
  				qparam.cw_max = aCWmin;
  				qparam.cw_min = (aCWmin + 1) / 2 - 1;
  				if (is_ocb)
  					qparam.txop = 0;
  				else if (use_11b)
  					qparam.txop = 6016/32;
  				else
  					qparam.txop = 3008/32;
  
  				if (is_ocb)
  					qparam.aifs = 3;
  				else
  					qparam.aifs = 2;
  				break;
  			case IEEE80211_AC_VO:
  				qparam.cw_max = (aCWmin + 1) / 2 - 1;
  				qparam.cw_min = (aCWmin + 1) / 4 - 1;
  				if (is_ocb)
  					qparam.txop = 0;
  				else if (use_11b)
  					qparam.txop = 3264/32;
  				else
  					qparam.txop = 1504/32;
  				qparam.aifs = 2;
  				break;
  			}
  		}
  		ieee80211_regulatory_limit_wmm_params(sdata, &qparam, ac);
  
  		qparam.uapsd = false;
  
  		sdata->tx_conf[ac] = qparam;
  		drv_conf_tx(local, sdata, ac, &qparam);
  	}
  
  	if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
  	    sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
  	    sdata->vif.type != NL80211_IFTYPE_NAN) {
  		sdata->vif.bss_conf.qos = enable_qos;
  		if (bss_notify)
  			ieee80211_bss_info_change_notify(sdata,
  							 BSS_CHANGED_QOS);
  	}
  }
  
  void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
  			 u16 transaction, u16 auth_alg, u16 status,
  			 const u8 *extra, size_t extra_len, const u8 *da,
  			 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
  			 u32 tx_flags)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct sk_buff *skb;
  	struct ieee80211_mgmt *mgmt;
  	int err;
  
  	/* 24 + 6 = header + auth_algo + auth_transaction + status_code */
  	skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
  			    24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
  	if (!skb)
  		return;
  
  	skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
  
  	mgmt = skb_put_zero(skb, 24 + 6);
  	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  					  IEEE80211_STYPE_AUTH);
  	memcpy(mgmt->da, da, ETH_ALEN);
  	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  	memcpy(mgmt->bssid, bssid, ETH_ALEN);
  	mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
  	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
  	mgmt->u.auth.status_code = cpu_to_le16(status);
  	if (extra)
  		skb_put_data(skb, extra, extra_len);
  
  	if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
  		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
  		err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
  		WARN_ON(err);
  	}
  
  	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
  					tx_flags;
  	ieee80211_tx_skb(sdata, skb);
  }
  
  void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
  				    const u8 *da, const u8 *bssid,
  				    u16 stype, u16 reason,
  				    bool send_frame, u8 *frame_buf)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct sk_buff *skb;
  	struct ieee80211_mgmt *mgmt = (void *)frame_buf;
  
  	/* build frame */
  	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
  	mgmt->duration = 0; /* initialize only */
  	mgmt->seq_ctrl = 0; /* initialize only */
  	memcpy(mgmt->da, da, ETH_ALEN);
  	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  	memcpy(mgmt->bssid, bssid, ETH_ALEN);
  	/* u.deauth.reason_code == u.disassoc.reason_code */
  	mgmt->u.deauth.reason_code = cpu_to_le16(reason);
  
  	if (send_frame) {
  		skb = dev_alloc_skb(local->hw.extra_tx_headroom +
  				    IEEE80211_DEAUTH_FRAME_LEN);
  		if (!skb)
  			return;
  
  		skb_reserve(skb, local->hw.extra_tx_headroom);
  
  		/* copy in frame */
  		skb_put_data(skb, mgmt, IEEE80211_DEAUTH_FRAME_LEN);
  
  		if (sdata->vif.type != NL80211_IFTYPE_STATION ||
  		    !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
  			IEEE80211_SKB_CB(skb)->flags |=
  				IEEE80211_TX_INTFL_DONT_ENCRYPT;
  
  		ieee80211_tx_skb(sdata, skb);
  	}
  }
  
  static u8 *ieee80211_write_he_6ghz_cap(u8 *pos, __le16 cap, u8 *end)
  {
  	if ((end - pos) < 5)
  		return pos;
  
  	*pos++ = WLAN_EID_EXTENSION;
  	*pos++ = 1 + sizeof(cap);
  	*pos++ = WLAN_EID_EXT_HE_6GHZ_CAPA;
  	memcpy(pos, &cap, sizeof(cap));
  
  	return pos + 2;
  }
  
  static int ieee80211_build_preq_ies_band(struct ieee80211_sub_if_data *sdata,
  					 u8 *buffer, size_t buffer_len,
  					 const u8 *ie, size_t ie_len,
  					 enum nl80211_band band,
  					 u32 rate_mask,
  					 struct cfg80211_chan_def *chandef,
  					 size_t *offset, u32 flags)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_supported_band *sband;
  	const struct ieee80211_sta_he_cap *he_cap;
  	u8 *pos = buffer, *end = buffer + buffer_len;
  	size_t noffset;
  	int supp_rates_len, i;
  	u8 rates[32];
  	int num_rates;
  	int ext_rates_len;
  	int shift;
  	u32 rate_flags;
  	bool have_80mhz = false;
  
  	*offset = 0;
  
  	sband = local->hw.wiphy->bands[band];
  	if (WARN_ON_ONCE(!sband))
  		return 0;
  
  	rate_flags = ieee80211_chandef_rate_flags(chandef);
  	shift = ieee80211_chandef_get_shift(chandef);
  
  	num_rates = 0;
  	for (i = 0; i < sband->n_bitrates; i++) {
  		if ((BIT(i) & rate_mask) == 0)
  			continue; /* skip rate */
  		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
  			continue;
  
  		rates[num_rates++] =
  			(u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
  					  (1 << shift) * 5);
  	}
  
  	supp_rates_len = min_t(int, num_rates, 8);
  
  	if (end - pos < 2 + supp_rates_len)
  		goto out_err;
  	*pos++ = WLAN_EID_SUPP_RATES;
  	*pos++ = supp_rates_len;
  	memcpy(pos, rates, supp_rates_len);
  	pos += supp_rates_len;
  
  	/* insert "request information" if in custom IEs */
  	if (ie && ie_len) {
  		static const u8 before_extrates[] = {
  			WLAN_EID_SSID,
  			WLAN_EID_SUPP_RATES,
  			WLAN_EID_REQUEST,
  		};
  		noffset = ieee80211_ie_split(ie, ie_len,
  					     before_extrates,
  					     ARRAY_SIZE(before_extrates),
  					     *offset);
  		if (end - pos < noffset - *offset)
  			goto out_err;
  		memcpy(pos, ie + *offset, noffset - *offset);
  		pos += noffset - *offset;
  		*offset = noffset;
  	}
  
  	ext_rates_len = num_rates - supp_rates_len;
  	if (ext_rates_len > 0) {
  		if (end - pos < 2 + ext_rates_len)
  			goto out_err;
  		*pos++ = WLAN_EID_EXT_SUPP_RATES;
  		*pos++ = ext_rates_len;
  		memcpy(pos, rates + supp_rates_len, ext_rates_len);
  		pos += ext_rates_len;
  	}
  
  	if (chandef->chan && sband->band == NL80211_BAND_2GHZ) {
  		if (end - pos < 3)
  			goto out_err;
  		*pos++ = WLAN_EID_DS_PARAMS;
  		*pos++ = 1;
  		*pos++ = ieee80211_frequency_to_channel(
  				chandef->chan->center_freq);
  	}
  
  	if (flags & IEEE80211_PROBE_FLAG_MIN_CONTENT)
  		goto done;
  
  	/* insert custom IEs that go before HT */
  	if (ie && ie_len) {
  		static const u8 before_ht[] = {
  			/*
  			 * no need to list the ones split off already
  			 * (or generated here)
  			 */
  			WLAN_EID_DS_PARAMS,
  			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
  		};
  		noffset = ieee80211_ie_split(ie, ie_len,
  					     before_ht, ARRAY_SIZE(before_ht),
  					     *offset);
  		if (end - pos < noffset - *offset)
  			goto out_err;
  		memcpy(pos, ie + *offset, noffset - *offset);
  		pos += noffset - *offset;
  		*offset = noffset;
  	}
  
  	if (sband->ht_cap.ht_supported) {
  		if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
  			goto out_err;
  		pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
  						sband->ht_cap.cap);
  	}
  
  	/* insert custom IEs that go before VHT */
  	if (ie && ie_len) {
  		static const u8 before_vht[] = {
  			/*
  			 * no need to list the ones split off already
  			 * (or generated here)
  			 */
  			WLAN_EID_BSS_COEX_2040,
  			WLAN_EID_EXT_CAPABILITY,
  			WLAN_EID_SSID_LIST,
  			WLAN_EID_CHANNEL_USAGE,
  			WLAN_EID_INTERWORKING,
  			WLAN_EID_MESH_ID,
  			/* 60 GHz (Multi-band, DMG, MMS) can't happen */
  		};
  		noffset = ieee80211_ie_split(ie, ie_len,
  					     before_vht, ARRAY_SIZE(before_vht),
  					     *offset);
  		if (end - pos < noffset - *offset)
  			goto out_err;
  		memcpy(pos, ie + *offset, noffset - *offset);
  		pos += noffset - *offset;
  		*offset = noffset;
  	}
  
  	/* Check if any channel in this sband supports at least 80 MHz */
  	for (i = 0; i < sband->n_channels; i++) {
  		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
  						IEEE80211_CHAN_NO_80MHZ))
  			continue;
  
  		have_80mhz = true;
  		break;
  	}
  
  	if (sband->vht_cap.vht_supported && have_80mhz) {
  		if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
  			goto out_err;
  		pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
  						 sband->vht_cap.cap);
  	}
  
  	/* insert custom IEs that go before HE */
  	if (ie && ie_len) {
  		static const u8 before_he[] = {
  			/*
  			 * no need to list the ones split off before VHT
  			 * or generated here
  			 */
  			WLAN_EID_EXTENSION, WLAN_EID_EXT_FILS_REQ_PARAMS,
  			WLAN_EID_AP_CSN,
  			/* TODO: add 11ah/11aj/11ak elements */
  		};
  		noffset = ieee80211_ie_split(ie, ie_len,
  					     before_he, ARRAY_SIZE(before_he),
  					     *offset);
  		if (end - pos < noffset - *offset)
  			goto out_err;
  		memcpy(pos, ie + *offset, noffset - *offset);
  		pos += noffset - *offset;
  		*offset = noffset;
  	}
  
  	he_cap = ieee80211_get_he_sta_cap(sband);
  	if (he_cap) {
  		pos = ieee80211_ie_build_he_cap(pos, he_cap, end);
  		if (!pos)
  			goto out_err;
  
  		if (sband->band == NL80211_BAND_6GHZ) {
  			enum nl80211_iftype iftype =
  				ieee80211_vif_type_p2p(&sdata->vif);
  			__le16 cap = ieee80211_get_he_6ghz_capa(sband, iftype);
  
  			pos = ieee80211_write_he_6ghz_cap(pos, cap, end);
  		}
  	}
  
  	/*
  	 * If adding more here, adjust code in main.c
  	 * that calculates local->scan_ies_len.
  	 */
  
  	return pos - buffer;
   out_err:
  	WARN_ONCE(1, "not enough space for preq IEs\n");
   done:
  	return pos - buffer;
  }
  
  int ieee80211_build_preq_ies(struct ieee80211_sub_if_data *sdata, u8 *buffer,
  			     size_t buffer_len,
  			     struct ieee80211_scan_ies *ie_desc,
  			     const u8 *ie, size_t ie_len,
  			     u8 bands_used, u32 *rate_masks,
  			     struct cfg80211_chan_def *chandef,
  			     u32 flags)
  {
  	size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
  	int i;
  
  	memset(ie_desc, 0, sizeof(*ie_desc));
  
  	for (i = 0; i < NUM_NL80211_BANDS; i++) {
  		if (bands_used & BIT(i)) {
  			pos += ieee80211_build_preq_ies_band(sdata,
  							     buffer + pos,
  							     buffer_len - pos,
  							     ie, ie_len, i,
  							     rate_masks[i],
  							     chandef,
  							     &custom_ie_offset,
  							     flags);
  			ie_desc->ies[i] = buffer + old_pos;
  			ie_desc->len[i] = pos - old_pos;
  			old_pos = pos;
  		}
  	}
  
  	/* add any remaining custom IEs */
  	if (ie && ie_len) {
  		if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
  			      "not enough space for preq custom IEs\n"))
  			return pos;
  		memcpy(buffer + pos, ie + custom_ie_offset,
  		       ie_len - custom_ie_offset);
  		ie_desc->common_ies = buffer + pos;
  		ie_desc->common_ie_len = ie_len - custom_ie_offset;
  		pos += ie_len - custom_ie_offset;
  	}
  
  	return pos;
  };
  
  struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
  					  const u8 *src, const u8 *dst,
  					  u32 ratemask,
  					  struct ieee80211_channel *chan,
  					  const u8 *ssid, size_t ssid_len,
  					  const u8 *ie, size_t ie_len,
  					  u32 flags)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct cfg80211_chan_def chandef;
  	struct sk_buff *skb;
  	struct ieee80211_mgmt *mgmt;
  	int ies_len;
  	u32 rate_masks[NUM_NL80211_BANDS] = {};
  	struct ieee80211_scan_ies dummy_ie_desc;
  
  	/*
  	 * Do not send DS Channel parameter for directed probe requests
  	 * in order to maximize the chance that we get a response.  Some
  	 * badly-behaved APs don't respond when this parameter is included.
  	 */
  	chandef.width = sdata->vif.bss_conf.chandef.width;
  	if (flags & IEEE80211_PROBE_FLAG_DIRECTED)
  		chandef.chan = NULL;
  	else
  		chandef.chan = chan;
  
  	skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
  				     100 + ie_len);
  	if (!skb)
  		return NULL;
  
  	rate_masks[chan->band] = ratemask;
  	ies_len = ieee80211_build_preq_ies(sdata, skb_tail_pointer(skb),
  					   skb_tailroom(skb), &dummy_ie_desc,
  					   ie, ie_len, BIT(chan->band),
  					   rate_masks, &chandef, flags);
  	skb_put(skb, ies_len);
  
  	if (dst) {
  		mgmt = (struct ieee80211_mgmt *) skb->data;
  		memcpy(mgmt->da, dst, ETH_ALEN);
  		memcpy(mgmt->bssid, dst, ETH_ALEN);
  	}
  
  	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  
  	return skb;
  }
  
  u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
  			    struct ieee802_11_elems *elems,
  			    enum nl80211_band band, u32 *basic_rates)
  {
  	struct ieee80211_supported_band *sband;
  	size_t num_rates;
  	u32 supp_rates, rate_flags;
  	int i, j, shift;
  
  	sband = sdata->local->hw.wiphy->bands[band];
  	if (WARN_ON(!sband))
  		return 1;
  
  	rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
  	shift = ieee80211_vif_get_shift(&sdata->vif);
  
  	num_rates = sband->n_bitrates;
  	supp_rates = 0;
  	for (i = 0; i < elems->supp_rates_len +
  		     elems->ext_supp_rates_len; i++) {
  		u8 rate = 0;
  		int own_rate;
  		bool is_basic;
  		if (i < elems->supp_rates_len)
  			rate = elems->supp_rates[i];
  		else if (elems->ext_supp_rates)
  			rate = elems->ext_supp_rates
  				[i - elems->supp_rates_len];
  		own_rate = 5 * (rate & 0x7f);
  		is_basic = !!(rate & 0x80);
  
  		if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
  			continue;
  
  		for (j = 0; j < num_rates; j++) {
  			int brate;
  			if ((rate_flags & sband->bitrates[j].flags)
  			    != rate_flags)
  				continue;
  
  			brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
  					     1 << shift);
  
  			if (brate == own_rate) {
  				supp_rates |= BIT(j);
  				if (basic_rates && is_basic)
  					*basic_rates |= BIT(j);
  			}
  		}
  	}
  	return supp_rates;
  }
  
  void ieee80211_stop_device(struct ieee80211_local *local)
  {
  	ieee80211_led_radio(local, false);
  	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
  
  	cancel_work_sync(&local->reconfig_filter);
  
  	flush_workqueue(local->workqueue);
  	drv_stop(local);
  }
  
  static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
  					   bool aborted)
  {
  	/* It's possible that we don't handle the scan completion in
  	 * time during suspend, so if it's still marked as completed
  	 * here, queue the work and flush it to clean things up.
  	 * Instead of calling the worker function directly here, we
  	 * really queue it to avoid potential races with other flows
  	 * scheduling the same work.
  	 */
  	if (test_bit(SCAN_COMPLETED, &local->scanning)) {
  		/* If coming from reconfiguration failure, abort the scan so
  		 * we don't attempt to continue a partial HW scan - which is
  		 * possible otherwise if (e.g.) the 2.4 GHz portion was the
  		 * completed scan, and a 5 GHz portion is still pending.
  		 */
  		if (aborted)
  			set_bit(SCAN_ABORTED, &local->scanning);
  		ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
  		flush_delayed_work(&local->scan_work);
  	}
  }
  
  static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
  {
  	struct ieee80211_sub_if_data *sdata;
  	struct ieee80211_chanctx *ctx;
  
  	/*
  	 * We get here if during resume the device can't be restarted properly.
  	 * We might also get here if this happens during HW reset, which is a
  	 * slightly different situation and we need to drop all connections in
  	 * the latter case.
  	 *
  	 * Ask cfg80211 to turn off all interfaces, this will result in more
  	 * warnings but at least we'll then get into a clean stopped state.
  	 */
  
  	local->resuming = false;
  	local->suspended = false;
  	local->in_reconfig = false;
  
  	ieee80211_flush_completed_scan(local, true);
  
  	/* scheduled scan clearly can't be running any more, but tell
  	 * cfg80211 and clear local state
  	 */
  	ieee80211_sched_scan_end(local);
  
  	list_for_each_entry(sdata, &local->interfaces, list)
  		sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
  
  	/* Mark channel contexts as not being in the driver any more to avoid
  	 * removing them from the driver during the shutdown process...
  	 */
  	mutex_lock(&local->chanctx_mtx);
  	list_for_each_entry(ctx, &local->chanctx_list, list)
  		ctx->driver_present = false;
  	mutex_unlock(&local->chanctx_mtx);
  }
  
  static void ieee80211_assign_chanctx(struct ieee80211_local *local,
  				     struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_chanctx_conf *conf;
  	struct ieee80211_chanctx *ctx;
  
  	if (!local->use_chanctx)
  		return;
  
  	mutex_lock(&local->chanctx_mtx);
  	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
  					 lockdep_is_held(&local->chanctx_mtx));
  	if (conf) {
  		ctx = container_of(conf, struct ieee80211_chanctx, conf);
  		drv_assign_vif_chanctx(local, sdata, ctx);
  	}
  	mutex_unlock(&local->chanctx_mtx);
  }
  
  static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct sta_info *sta;
  
  	/* add STAs back */
  	mutex_lock(&local->sta_mtx);
  	list_for_each_entry(sta, &local->sta_list, list) {
  		enum ieee80211_sta_state state;
  
  		if (!sta->uploaded || sta->sdata != sdata)
  			continue;
  
  		for (state = IEEE80211_STA_NOTEXIST;
  		     state < sta->sta_state; state++)
  			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
  					      state + 1));
  	}
  	mutex_unlock(&local->sta_mtx);
  }
  
  static int ieee80211_reconfig_nan(struct ieee80211_sub_if_data *sdata)
  {
  	struct cfg80211_nan_func *func, **funcs;
  	int res, id, i = 0;
  
  	res = drv_start_nan(sdata->local, sdata,
  			    &sdata->u.nan.conf);
  	if (WARN_ON(res))
  		return res;
  
  	funcs = kcalloc(sdata->local->hw.max_nan_de_entries + 1,
  			sizeof(*funcs),
  			GFP_KERNEL);
  	if (!funcs)
  		return -ENOMEM;
  
  	/* Add all the functions:
  	 * This is a little bit ugly. We need to call a potentially sleeping
  	 * callback for each NAN function, so we can't hold the spinlock.
  	 */
  	spin_lock_bh(&sdata->u.nan.func_lock);
  
  	idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, id)
  		funcs[i++] = func;
  
  	spin_unlock_bh(&sdata->u.nan.func_lock);
  
  	for (i = 0; funcs[i]; i++) {
  		res = drv_add_nan_func(sdata->local, sdata, funcs[i]);
  		if (WARN_ON(res))
  			ieee80211_nan_func_terminated(&sdata->vif,
  						      funcs[i]->instance_id,
  						      NL80211_NAN_FUNC_TERM_REASON_ERROR,
  						      GFP_KERNEL);
  	}
  
  	kfree(funcs);
  
  	return 0;
  }
  
  int ieee80211_reconfig(struct ieee80211_local *local)
  {
  	struct ieee80211_hw *hw = &local->hw;
  	struct ieee80211_sub_if_data *sdata;
  	struct ieee80211_chanctx *ctx;
  	struct sta_info *sta;
  	int res, i;
  	bool reconfig_due_to_wowlan = false;
  	struct ieee80211_sub_if_data *sched_scan_sdata;
  	struct cfg80211_sched_scan_request *sched_scan_req;
  	bool sched_scan_stopped = false;
  	bool suspended = local->suspended;
  
  	/* nothing to do if HW shouldn't run */
  	if (!local->open_count)
  		goto wake_up;
  
  #ifdef CONFIG_PM
  	if (suspended)
  		local->resuming = true;
  
  	if (local->wowlan) {
  		/*
  		 * In the wowlan case, both mac80211 and the device
  		 * are functional when the resume op is called, so
  		 * clear local->suspended so the device could operate
  		 * normally (e.g. pass rx frames).
  		 */
  		local->suspended = false;
  		res = drv_resume(local);
  		local->wowlan = false;
  		if (res < 0) {
  			local->resuming = false;
  			return res;
  		}
  		if (res == 0)
  			goto wake_up;
  		WARN_ON(res > 1);
  		/*
  		 * res is 1, which means the driver requested
  		 * to go through a regular reset on wakeup.
  		 * restore local->suspended in this case.
  		 */
  		reconfig_due_to_wowlan = true;
  		local->suspended = true;
  	}
  #endif
  
  	/*
  	 * In case of hw_restart during suspend (without wowlan),
  	 * cancel restart work, as we are reconfiguring the device
  	 * anyway.
  	 * Note that restart_work is scheduled on a frozen workqueue,
  	 * so we can't deadlock in this case.
  	 */
  	if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
  		cancel_work_sync(&local->restart_work);
  
  	local->started = false;
  
  	/*
  	 * Upon resume hardware can sometimes be goofy due to
  	 * various platform / driver / bus issues, so restarting
  	 * the device may at times not work immediately. Propagate
  	 * the error.
  	 */
  	res = drv_start(local);
  	if (res) {
  		if (suspended)
  			WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
  		else
  			WARN(1, "Hardware became unavailable during restart.\n");
  		ieee80211_handle_reconfig_failure(local);
  		return res;
  	}
  
  	/* setup fragmentation threshold */
  	drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
  
  	/* setup RTS threshold */
  	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
  
  	/* reset coverage class */
  	drv_set_coverage_class(local, hw->wiphy->coverage_class);
  
  	ieee80211_led_radio(local, true);
  	ieee80211_mod_tpt_led_trig(local,
  				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
  
  	/* add interfaces */
  	sdata = rtnl_dereference(local->monitor_sdata);
  	if (sdata) {
  		/* in HW restart it exists already */
  		WARN_ON(local->resuming);
  		res = drv_add_interface(local, sdata);
  		if (WARN_ON(res)) {
  			RCU_INIT_POINTER(local->monitor_sdata, NULL);
  			synchronize_net();
  			kfree(sdata);
  		}
  	}
  
  	list_for_each_entry(sdata, &local->interfaces, list) {
  		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
  		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
  		    ieee80211_sdata_running(sdata)) {
  			res = drv_add_interface(local, sdata);
  			if (WARN_ON(res))
  				break;
  		}
  	}
  
  	/* If adding any of the interfaces failed above, roll back and
  	 * report failure.
  	 */
  	if (res) {
  		list_for_each_entry_continue_reverse(sdata, &local->interfaces,
  						     list)
  			if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
  			    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
  			    ieee80211_sdata_running(sdata))
  				drv_remove_interface(local, sdata);
  		ieee80211_handle_reconfig_failure(local);
  		return res;
  	}
  
  	/* add channel contexts */
  	if (local->use_chanctx) {
  		mutex_lock(&local->chanctx_mtx);
  		list_for_each_entry(ctx, &local->chanctx_list, list)
  			if (ctx->replace_state !=
  			    IEEE80211_CHANCTX_REPLACES_OTHER)
  				WARN_ON(drv_add_chanctx(local, ctx));
  		mutex_unlock(&local->chanctx_mtx);
  
  		sdata = rtnl_dereference(local->monitor_sdata);
  		if (sdata && ieee80211_sdata_running(sdata))
  			ieee80211_assign_chanctx(local, sdata);
  	}
  
  	/* reconfigure hardware */
  	ieee80211_hw_config(local, ~0);
  
  	ieee80211_configure_filter(local);
  
  	/* Finally also reconfigure all the BSS information */
  	list_for_each_entry(sdata, &local->interfaces, list) {
  		u32 changed;
  
  		if (!ieee80211_sdata_running(sdata))
  			continue;
  
  		ieee80211_assign_chanctx(local, sdata);
  
  		switch (sdata->vif.type) {
  		case NL80211_IFTYPE_AP_VLAN:
  		case NL80211_IFTYPE_MONITOR:
  			break;
  		case NL80211_IFTYPE_ADHOC:
  			if (sdata->vif.bss_conf.ibss_joined)
  				WARN_ON(drv_join_ibss(local, sdata));
  			fallthrough;
  		default:
  			ieee80211_reconfig_stations(sdata);
  			fallthrough;
  		case NL80211_IFTYPE_AP: /* AP stations are handled later */
  			for (i = 0; i < IEEE80211_NUM_ACS; i++)
  				drv_conf_tx(local, sdata, i,
  					    &sdata->tx_conf[i]);
  			break;
  		}
  
  		/* common change flags for all interface types */
  		changed = BSS_CHANGED_ERP_CTS_PROT |
  			  BSS_CHANGED_ERP_PREAMBLE |
  			  BSS_CHANGED_ERP_SLOT |
  			  BSS_CHANGED_HT |
  			  BSS_CHANGED_BASIC_RATES |
  			  BSS_CHANGED_BEACON_INT |
  			  BSS_CHANGED_BSSID |
  			  BSS_CHANGED_CQM |
  			  BSS_CHANGED_QOS |
  			  BSS_CHANGED_IDLE |
  			  BSS_CHANGED_TXPOWER |
  			  BSS_CHANGED_MCAST_RATE;
  
  		if (sdata->vif.mu_mimo_owner)
  			changed |= BSS_CHANGED_MU_GROUPS;
  
  		switch (sdata->vif.type) {
  		case NL80211_IFTYPE_STATION:
  			changed |= BSS_CHANGED_ASSOC |
  				   BSS_CHANGED_ARP_FILTER |
  				   BSS_CHANGED_PS;
  
  			/* Re-send beacon info report to the driver */
  			if (sdata->u.mgd.have_beacon)
  				changed |= BSS_CHANGED_BEACON_INFO;
  
  			if (sdata->vif.bss_conf.max_idle_period ||
  			    sdata->vif.bss_conf.protected_keep_alive)
  				changed |= BSS_CHANGED_KEEP_ALIVE;
  
  			sdata_lock(sdata);
  			ieee80211_bss_info_change_notify(sdata, changed);
  			sdata_unlock(sdata);
  			break;
  		case NL80211_IFTYPE_OCB:
  			changed |= BSS_CHANGED_OCB;
  			ieee80211_bss_info_change_notify(sdata, changed);
  			break;
  		case NL80211_IFTYPE_ADHOC:
  			changed |= BSS_CHANGED_IBSS;
  			fallthrough;
  		case NL80211_IFTYPE_AP:
  			changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
  
  			if (sdata->vif.bss_conf.ftm_responder == 1 &&
  			    wiphy_ext_feature_isset(sdata->local->hw.wiphy,
  					NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER))
  				changed |= BSS_CHANGED_FTM_RESPONDER;
  
  			if (sdata->vif.type == NL80211_IFTYPE_AP) {
  				changed |= BSS_CHANGED_AP_PROBE_RESP;
  
  				if (rcu_access_pointer(sdata->u.ap.beacon))
  					drv_start_ap(local, sdata);
  			}
  			fallthrough;
  		case NL80211_IFTYPE_MESH_POINT:
  			if (sdata->vif.bss_conf.enable_beacon) {
  				changed |= BSS_CHANGED_BEACON |
  					   BSS_CHANGED_BEACON_ENABLED;
  				ieee80211_bss_info_change_notify(sdata, changed);
  			}
  			break;
  		case NL80211_IFTYPE_NAN:
  			res = ieee80211_reconfig_nan(sdata);
  			if (res < 0) {
  				ieee80211_handle_reconfig_failure(local);
  				return res;
  			}
  			break;
  		case NL80211_IFTYPE_AP_VLAN:
  		case NL80211_IFTYPE_MONITOR:
  		case NL80211_IFTYPE_P2P_DEVICE:
  			/* nothing to do */
  			break;
  		case NL80211_IFTYPE_UNSPECIFIED:
  		case NUM_NL80211_IFTYPES:
  		case NL80211_IFTYPE_P2P_CLIENT:
  		case NL80211_IFTYPE_P2P_GO:
  		case NL80211_IFTYPE_WDS:
  			WARN_ON(1);
  			break;
  		}
  	}
  
  	ieee80211_recalc_ps(local);
  
  	/*
  	 * The sta might be in psm against the ap (e.g. because
  	 * this was the state before a hw restart), so we
  	 * explicitly send a null packet in order to make sure
  	 * it'll sync against the ap (and get out of psm).
  	 */
  	if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
  		list_for_each_entry(sdata, &local->interfaces, list) {
  			if (sdata->vif.type != NL80211_IFTYPE_STATION)
  				continue;
  			if (!sdata->u.mgd.associated)
  				continue;
  
  			ieee80211_send_nullfunc(local, sdata, false);
  		}
  	}
  
  	/* APs are now beaconing, add back stations */
  	mutex_lock(&local->sta_mtx);
  	list_for_each_entry(sta, &local->sta_list, list) {
  		enum ieee80211_sta_state state;
  
  		if (!sta->uploaded)
  			continue;
  
  		if (sta->sdata->vif.type != NL80211_IFTYPE_AP &&
  		    sta->sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
  			continue;
  
  		for (state = IEEE80211_STA_NOTEXIST;
  		     state < sta->sta_state; state++)
  			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
  					      state + 1));
  	}
  	mutex_unlock(&local->sta_mtx);
  
  	/* add back keys */
  	list_for_each_entry(sdata, &local->interfaces, list)
  		ieee80211_reenable_keys(sdata);
  
  	/* Reconfigure sched scan if it was interrupted by FW restart */
  	mutex_lock(&local->mtx);
  	sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
  						lockdep_is_held(&local->mtx));
  	sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
  						lockdep_is_held(&local->mtx));
  	if (sched_scan_sdata && sched_scan_req)
  		/*
  		 * Sched scan stopped, but we don't want to report it. Instead,
  		 * we're trying to reschedule. However, if more than one scan
  		 * plan was set, we cannot reschedule since we don't know which
  		 * scan plan was currently running (and some scan plans may have
  		 * already finished).
  		 */
  		if (sched_scan_req->n_scan_plans > 1 ||
  		    __ieee80211_request_sched_scan_start(sched_scan_sdata,
  							 sched_scan_req)) {
  			RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
  			RCU_INIT_POINTER(local->sched_scan_req, NULL);
  			sched_scan_stopped = true;
  		}
  	mutex_unlock(&local->mtx);
  
  	if (sched_scan_stopped)
  		cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
  
   wake_up:
  
  	if (local->monitors == local->open_count && local->monitors > 0)
  		ieee80211_add_virtual_monitor(local);
  
  	/*
  	 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
  	 * sessions can be established after a resume.
  	 *
  	 * Also tear down aggregation sessions since reconfiguring
  	 * them in a hardware restart scenario is not easily done
  	 * right now, and the hardware will have lost information
  	 * about the sessions, but we and the AP still think they
  	 * are active. This is really a workaround though.
  	 */
  	if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
  		mutex_lock(&local->sta_mtx);
  
  		list_for_each_entry(sta, &local->sta_list, list) {
  			if (!local->resuming)
  				ieee80211_sta_tear_down_BA_sessions(
  						sta, AGG_STOP_LOCAL_REQUEST);
  			clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  		}
  
  		mutex_unlock(&local->sta_mtx);
  	}
  
  	if (local->in_reconfig) {
  		local->in_reconfig = false;
  		barrier();
  
  		/* Restart deferred ROCs */
  		mutex_lock(&local->mtx);
  		ieee80211_start_next_roc(local);
  		mutex_unlock(&local->mtx);
  
  		/* Requeue all works */
  		list_for_each_entry(sdata, &local->interfaces, list)
  			ieee80211_queue_work(&local->hw, &sdata->work);
  	}
  
  	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
  					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  					false);
  
  	/*
  	 * If this is for hw restart things are still running.
  	 * We may want to change that later, however.
  	 */
  	if (local->open_count && (!suspended || reconfig_due_to_wowlan))
  		drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
  
  	if (!suspended)
  		return 0;
  
  #ifdef CONFIG_PM
  	/* first set suspended false, then resuming */
  	local->suspended = false;
  	mb();
  	local->resuming = false;
  
  	ieee80211_flush_completed_scan(local, false);
  
  	if (local->open_count && !reconfig_due_to_wowlan)
  		drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
  
  	list_for_each_entry(sdata, &local->interfaces, list) {
  		if (!ieee80211_sdata_running(sdata))
  			continue;
  		if (sdata->vif.type == NL80211_IFTYPE_STATION)
  			ieee80211_sta_restart(sdata);
  	}
  
  	mod_timer(&local->sta_cleanup, jiffies + 1);
  #else
  	WARN_ON(1);
  #endif
  
  	return 0;
  }
  
  void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
  {
  	struct ieee80211_sub_if_data *sdata;
  	struct ieee80211_local *local;
  	struct ieee80211_key *key;
  
  	if (WARN_ON(!vif))
  		return;
  
  	sdata = vif_to_sdata(vif);
  	local = sdata->local;
  
  	if (WARN_ON(!local->resuming))
  		return;
  
  	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
  		return;
  
  	sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
  
  	mutex_lock(&local->key_mtx);
  	list_for_each_entry(key, &sdata->key_list, list)
  		key->flags |= KEY_FLAG_TAINTED;
  	mutex_unlock(&local->key_mtx);
  }
  EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
  
  void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_chanctx_conf *chanctx_conf;
  	struct ieee80211_chanctx *chanctx;
  
  	mutex_lock(&local->chanctx_mtx);
  
  	chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
  					lockdep_is_held(&local->chanctx_mtx));
  
  	/*
  	 * This function can be called from a work, thus it may be possible
  	 * that the chanctx_conf is removed (due to a disconnection, for
  	 * example).
  	 * So nothing should be done in such case.
  	 */
  	if (!chanctx_conf)
  		goto unlock;
  
  	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
  	ieee80211_recalc_smps_chanctx(local, chanctx);
   unlock:
  	mutex_unlock(&local->chanctx_mtx);
  }
  
  void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_chanctx_conf *chanctx_conf;
  	struct ieee80211_chanctx *chanctx;
  
  	mutex_lock(&local->chanctx_mtx);
  
  	chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
  					lockdep_is_held(&local->chanctx_mtx));
  
  	if (WARN_ON_ONCE(!chanctx_conf))
  		goto unlock;
  
  	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
  	ieee80211_recalc_chanctx_min_def(local, chanctx);
   unlock:
  	mutex_unlock(&local->chanctx_mtx);
  }
  
  size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
  {
  	size_t pos = offset;
  
  	while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
  		pos += 2 + ies[pos + 1];
  
  	return pos;
  }
  
  static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
  					    int rssi_min_thold,
  					    int rssi_max_thold)
  {
  	trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
  
  	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
  		return;
  
  	/*
  	 * Scale up threshold values before storing it, as the RSSI averaging
  	 * algorithm uses a scaled up value as well. Change this scaling
  	 * factor if the RSSI averaging algorithm changes.
  	 */
  	sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
  	sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
  }
  
  void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
  				    int rssi_min_thold,
  				    int rssi_max_thold)
  {
  	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  
  	WARN_ON(rssi_min_thold == rssi_max_thold ||
  		rssi_min_thold > rssi_max_thold);
  
  	_ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
  				       rssi_max_thold);
  }
  EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
  
  void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
  {
  	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  
  	_ieee80211_enable_rssi_reports(sdata, 0, 0);
  }
  EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
  
  u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
  			      u16 cap)
  {
  	__le16 tmp;
  
  	*pos++ = WLAN_EID_HT_CAPABILITY;
  	*pos++ = sizeof(struct ieee80211_ht_cap);
  	memset(pos, 0, sizeof(struct ieee80211_ht_cap));
  
  	/* capability flags */
  	tmp = cpu_to_le16(cap);
  	memcpy(pos, &tmp, sizeof(u16));
  	pos += sizeof(u16);
  
  	/* AMPDU parameters */
  	*pos++ = ht_cap->ampdu_factor |
  		 (ht_cap->ampdu_density <<
  			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
  
  	/* MCS set */
  	memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
  	pos += sizeof(ht_cap->mcs);
  
  	/* extended capabilities */
  	pos += sizeof(__le16);
  
  	/* BF capabilities */
  	pos += sizeof(__le32);
  
  	/* antenna selection */
  	pos += sizeof(u8);
  
  	return pos;
  }
  
  u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
  			       u32 cap)
  {
  	__le32 tmp;
  
  	*pos++ = WLAN_EID_VHT_CAPABILITY;
  	*pos++ = sizeof(struct ieee80211_vht_cap);
  	memset(pos, 0, sizeof(struct ieee80211_vht_cap));
  
  	/* capability flags */
  	tmp = cpu_to_le32(cap);
  	memcpy(pos, &tmp, sizeof(u32));
  	pos += sizeof(u32);
  
  	/* VHT MCS set */
  	memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
  	pos += sizeof(vht_cap->vht_mcs);
  
  	return pos;
  }
  
  u8 ieee80211_ie_len_he_cap(struct ieee80211_sub_if_data *sdata, u8 iftype)
  {
  	const struct ieee80211_sta_he_cap *he_cap;
  	struct ieee80211_supported_band *sband;
  	u8 n;
  
  	sband = ieee80211_get_sband(sdata);
  	if (!sband)
  		return 0;
  
  	he_cap = ieee80211_get_he_iftype_cap(sband, iftype);
  	if (!he_cap)
  		return 0;
  
  	n = ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem);
  	return 2 + 1 +
  	       sizeof(he_cap->he_cap_elem) + n +
  	       ieee80211_he_ppe_size(he_cap->ppe_thres[0],
  				     he_cap->he_cap_elem.phy_cap_info);
  }
  
  u8 *ieee80211_ie_build_he_cap(u8 *pos,
  			      const struct ieee80211_sta_he_cap *he_cap,
  			      u8 *end)
  {
  	u8 n;
  	u8 ie_len;
  	u8 *orig_pos = pos;
  
  	/* Make sure we have place for the IE */
  	/*
  	 * TODO: the 1 added is because this temporarily is under the EXTENSION
  	 * IE. Get rid of it when it moves.
  	 */
  	if (!he_cap)
  		return orig_pos;
  
  	n = ieee80211_he_mcs_nss_size(&he_cap->he_cap_elem);
  	ie_len = 2 + 1 +
  		 sizeof(he_cap->he_cap_elem) + n +
  		 ieee80211_he_ppe_size(he_cap->ppe_thres[0],
  				       he_cap->he_cap_elem.phy_cap_info);
  
  	if ((end - pos) < ie_len)
  		return orig_pos;
  
  	*pos++ = WLAN_EID_EXTENSION;
  	pos++; /* We'll set the size later below */
  	*pos++ = WLAN_EID_EXT_HE_CAPABILITY;
  
  	/* Fixed data */
  	memcpy(pos, &he_cap->he_cap_elem, sizeof(he_cap->he_cap_elem));
  	pos += sizeof(he_cap->he_cap_elem);
  
  	memcpy(pos, &he_cap->he_mcs_nss_supp, n);
  	pos += n;
  
  	/* Check if PPE Threshold should be present */
  	if ((he_cap->he_cap_elem.phy_cap_info[6] &
  	     IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT) == 0)
  		goto end;
  
  	/*
  	 * Calculate how many PPET16/PPET8 pairs are to come. Algorithm:
  	 * (NSS_M1 + 1) x (num of 1 bits in RU_INDEX_BITMASK)
  	 */
  	n = hweight8(he_cap->ppe_thres[0] &
  		     IEEE80211_PPE_THRES_RU_INDEX_BITMASK_MASK);
  	n *= (1 + ((he_cap->ppe_thres[0] & IEEE80211_PPE_THRES_NSS_MASK) >>
  		   IEEE80211_PPE_THRES_NSS_POS));
  
  	/*
  	 * Each pair is 6 bits, and we need to add the 7 "header" bits to the
  	 * total size.
  	 */
  	n = (n * IEEE80211_PPE_THRES_INFO_PPET_SIZE * 2) + 7;
  	n = DIV_ROUND_UP(n, 8);
  
  	/* Copy PPE Thresholds */
  	memcpy(pos, &he_cap->ppe_thres, n);
  	pos += n;
  
  end:
  	orig_pos[1] = (pos - orig_pos) - 2;
  	return pos;
  }
  
  void ieee80211_ie_build_he_6ghz_cap(struct ieee80211_sub_if_data *sdata,
  				    struct sk_buff *skb)
  {
  	struct ieee80211_supported_band *sband;
  	const struct ieee80211_sband_iftype_data *iftd;
  	enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
  	u8 *pos;
  	u16 cap;
  
  	sband = ieee80211_get_sband(sdata);
  	if (!sband)
  		return;
  
  	iftd = ieee80211_get_sband_iftype_data(sband, iftype);
  	if (WARN_ON(!iftd))
  		return;
  
  	/* Check for device HE 6 GHz capability before adding element */
  	if (!iftd->he_6ghz_capa.capa)
  		return;
  
  	cap = le16_to_cpu(iftd->he_6ghz_capa.capa);
  	cap &= ~IEEE80211_HE_6GHZ_CAP_SM_PS;
  
  	switch (sdata->smps_mode) {
  	case IEEE80211_SMPS_AUTOMATIC:
  	case IEEE80211_SMPS_NUM_MODES:
  		WARN_ON(1);
  		fallthrough;
  	case IEEE80211_SMPS_OFF:
  		cap |= u16_encode_bits(WLAN_HT_CAP_SM_PS_DISABLED,
  				       IEEE80211_HE_6GHZ_CAP_SM_PS);
  		break;
  	case IEEE80211_SMPS_STATIC:
  		cap |= u16_encode_bits(WLAN_HT_CAP_SM_PS_STATIC,
  				       IEEE80211_HE_6GHZ_CAP_SM_PS);
  		break;
  	case IEEE80211_SMPS_DYNAMIC:
  		cap |= u16_encode_bits(WLAN_HT_CAP_SM_PS_DYNAMIC,
  				       IEEE80211_HE_6GHZ_CAP_SM_PS);
  		break;
  	}
  
  	pos = skb_put(skb, 2 + 1 + sizeof(cap));
  	ieee80211_write_he_6ghz_cap(pos, cpu_to_le16(cap),
  				    pos + 2 + 1 + sizeof(cap));
  }
  
  u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
  			       const struct cfg80211_chan_def *chandef,
  			       u16 prot_mode, bool rifs_mode)
  {
  	struct ieee80211_ht_operation *ht_oper;
  	/* Build HT Information */
  	*pos++ = WLAN_EID_HT_OPERATION;
  	*pos++ = sizeof(struct ieee80211_ht_operation);
  	ht_oper = (struct ieee80211_ht_operation *)pos;
  	ht_oper->primary_chan = ieee80211_frequency_to_channel(
  					chandef->chan->center_freq);
  	switch (chandef->width) {
  	case NL80211_CHAN_WIDTH_160:
  	case NL80211_CHAN_WIDTH_80P80:
  	case NL80211_CHAN_WIDTH_80:
  	case NL80211_CHAN_WIDTH_40:
  		if (chandef->center_freq1 > chandef->chan->center_freq)
  			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
  		else
  			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
  		break;
  	default:
  		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
  		break;
  	}
  	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
  	    chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
  	    chandef->width != NL80211_CHAN_WIDTH_20)
  		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
  
  	if (rifs_mode)
  		ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
  
  	ht_oper->operation_mode = cpu_to_le16(prot_mode);
  	ht_oper->stbc_param = 0x0000;
  
  	/* It seems that Basic MCS set and Supported MCS set
  	   are identical for the first 10 bytes */
  	memset(&ht_oper->basic_set, 0, 16);
  	memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
  
  	return pos + sizeof(struct ieee80211_ht_operation);
  }
  
  void ieee80211_ie_build_wide_bw_cs(u8 *pos,
  				   const struct cfg80211_chan_def *chandef)
  {
  	*pos++ = WLAN_EID_WIDE_BW_CHANNEL_SWITCH;	/* EID */
  	*pos++ = 3;					/* IE length */
  	/* New channel width */
  	switch (chandef->width) {
  	case NL80211_CHAN_WIDTH_80:
  		*pos++ = IEEE80211_VHT_CHANWIDTH_80MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_160:
  		*pos++ = IEEE80211_VHT_CHANWIDTH_160MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_80P80:
  		*pos++ = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
  		break;
  	default:
  		*pos++ = IEEE80211_VHT_CHANWIDTH_USE_HT;
  	}
  
  	/* new center frequency segment 0 */
  	*pos++ = ieee80211_frequency_to_channel(chandef->center_freq1);
  	/* new center frequency segment 1 */
  	if (chandef->center_freq2)
  		*pos++ = ieee80211_frequency_to_channel(chandef->center_freq2);
  	else
  		*pos++ = 0;
  }
  
  u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
  				const struct cfg80211_chan_def *chandef)
  {
  	struct ieee80211_vht_operation *vht_oper;
  
  	*pos++ = WLAN_EID_VHT_OPERATION;
  	*pos++ = sizeof(struct ieee80211_vht_operation);
  	vht_oper = (struct ieee80211_vht_operation *)pos;
  	vht_oper->center_freq_seg0_idx = ieee80211_frequency_to_channel(
  							chandef->center_freq1);
  	if (chandef->center_freq2)
  		vht_oper->center_freq_seg1_idx =
  			ieee80211_frequency_to_channel(chandef->center_freq2);
  	else
  		vht_oper->center_freq_seg1_idx = 0x00;
  
  	switch (chandef->width) {
  	case NL80211_CHAN_WIDTH_160:
  		/*
  		 * Convert 160 MHz channel width to new style as interop
  		 * workaround.
  		 */
  		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
  		vht_oper->center_freq_seg1_idx = vht_oper->center_freq_seg0_idx;
  		if (chandef->chan->center_freq < chandef->center_freq1)
  			vht_oper->center_freq_seg0_idx -= 8;
  		else
  			vht_oper->center_freq_seg0_idx += 8;
  		break;
  	case NL80211_CHAN_WIDTH_80P80:
  		/*
  		 * Convert 80+80 MHz channel width to new style as interop
  		 * workaround.
  		 */
  		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_80:
  		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
  		break;
  	default:
  		vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
  		break;
  	}
  
  	/* don't require special VHT peer rates */
  	vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
  
  	return pos + sizeof(struct ieee80211_vht_operation);
  }
  
  u8 *ieee80211_ie_build_he_oper(u8 *pos, struct cfg80211_chan_def *chandef)
  {
  	struct ieee80211_he_operation *he_oper;
  	struct ieee80211_he_6ghz_oper *he_6ghz_op;
  	u32 he_oper_params;
  	u8 ie_len = 1 + sizeof(struct ieee80211_he_operation);
  
  	if (chandef->chan->band == NL80211_BAND_6GHZ)
  		ie_len += sizeof(struct ieee80211_he_6ghz_oper);
  
  	*pos++ = WLAN_EID_EXTENSION;
  	*pos++ = ie_len;
  	*pos++ = WLAN_EID_EXT_HE_OPERATION;
  
  	he_oper_params = 0;
  	he_oper_params |= u32_encode_bits(1023, /* disabled */
  				IEEE80211_HE_OPERATION_RTS_THRESHOLD_MASK);
  	he_oper_params |= u32_encode_bits(1,
  				IEEE80211_HE_OPERATION_ER_SU_DISABLE);
  	he_oper_params |= u32_encode_bits(1,
  				IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED);
  	if (chandef->chan->band == NL80211_BAND_6GHZ)
  		he_oper_params |= u32_encode_bits(1,
  				IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
  
  	he_oper = (struct ieee80211_he_operation *)pos;
  	he_oper->he_oper_params = cpu_to_le32(he_oper_params);
  
  	/* don't require special HE peer rates */
  	he_oper->he_mcs_nss_set = cpu_to_le16(0xffff);
  	pos += sizeof(struct ieee80211_he_operation);
  
  	if (chandef->chan->band != NL80211_BAND_6GHZ)
  		goto out;
  
  	/* TODO add VHT operational */
  	he_6ghz_op = (struct ieee80211_he_6ghz_oper *)pos;
  	he_6ghz_op->minrate = 6; /* 6 Mbps */
  	he_6ghz_op->primary =
  		ieee80211_frequency_to_channel(chandef->chan->center_freq);
  	he_6ghz_op->ccfs0 =
  		ieee80211_frequency_to_channel(chandef->center_freq1);
  	if (chandef->center_freq2)
  		he_6ghz_op->ccfs1 =
  			ieee80211_frequency_to_channel(chandef->center_freq2);
  	else
  		he_6ghz_op->ccfs1 = 0;
  
  	switch (chandef->width) {
  	case NL80211_CHAN_WIDTH_160:
  		/* Convert 160 MHz channel width to new style as interop
  		 * workaround.
  		 */
  		he_6ghz_op->control =
  			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
  		he_6ghz_op->ccfs1 = he_6ghz_op->ccfs0;
  		if (chandef->chan->center_freq < chandef->center_freq1)
  			he_6ghz_op->ccfs0 -= 8;
  		else
  			he_6ghz_op->ccfs0 += 8;
  		fallthrough;
  	case NL80211_CHAN_WIDTH_80P80:
  		he_6ghz_op->control =
  			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_80:
  		he_6ghz_op->control =
  			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_40:
  		he_6ghz_op->control =
  			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
  		break;
  	default:
  		he_6ghz_op->control =
  			IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
  		break;
  	}
  
  	pos += sizeof(struct ieee80211_he_6ghz_oper);
  
  out:
  	return pos;
  }
  
  bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
  			       struct cfg80211_chan_def *chandef)
  {
  	enum nl80211_channel_type channel_type;
  
  	if (!ht_oper)
  		return false;
  
  	switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
  	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
  		channel_type = NL80211_CHAN_HT20;
  		break;
  	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
  		channel_type = NL80211_CHAN_HT40PLUS;
  		break;
  	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
  		channel_type = NL80211_CHAN_HT40MINUS;
  		break;
  	default:
  		channel_type = NL80211_CHAN_NO_HT;
  		return false;
  	}
  
  	cfg80211_chandef_create(chandef, chandef->chan, channel_type);
  	return true;
  }
  
  bool ieee80211_chandef_vht_oper(struct ieee80211_hw *hw, u32 vht_cap_info,
  				const struct ieee80211_vht_operation *oper,
  				const struct ieee80211_ht_operation *htop,
  				struct cfg80211_chan_def *chandef)
  {
  	struct cfg80211_chan_def new = *chandef;
  	int cf0, cf1;
  	int ccfs0, ccfs1, ccfs2;
  	int ccf0, ccf1;
  	u32 vht_cap;
  	bool support_80_80 = false;
  	bool support_160 = false;
  	u8 ext_nss_bw_supp = u32_get_bits(vht_cap_info,
  					  IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
  	u8 supp_chwidth = u32_get_bits(vht_cap_info,
  				       IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
  
  	if (!oper || !htop)
  		return false;
  
  	vht_cap = hw->wiphy->bands[chandef->chan->band]->vht_cap.cap;
  	support_160 = (vht_cap & (IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK |
  				  IEEE80211_VHT_CAP_EXT_NSS_BW_MASK));
  	support_80_80 = ((vht_cap &
  			 IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
  			(vht_cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
  			 vht_cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
  			((vht_cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) >>
  				    IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT > 1));
  	ccfs0 = oper->center_freq_seg0_idx;
  	ccfs1 = oper->center_freq_seg1_idx;
  	ccfs2 = (le16_to_cpu(htop->operation_mode) &
  				IEEE80211_HT_OP_MODE_CCFS2_MASK)
  			>> IEEE80211_HT_OP_MODE_CCFS2_SHIFT;
  
  	ccf0 = ccfs0;
  
  	/* if not supported, parse as though we didn't understand it */
  	if (!ieee80211_hw_check(hw, SUPPORTS_VHT_EXT_NSS_BW))
  		ext_nss_bw_supp = 0;
  
  	/*
  	 * Cf. IEEE 802.11 Table 9-250
  	 *
  	 * We really just consider that because it's inefficient to connect
  	 * at a higher bandwidth than we'll actually be able to use.
  	 */
  	switch ((supp_chwidth << 4) | ext_nss_bw_supp) {
  	default:
  	case 0x00:
  		ccf1 = 0;
  		support_160 = false;
  		support_80_80 = false;
  		break;
  	case 0x01:
  		support_80_80 = false;
  		fallthrough;
  	case 0x02:
  	case 0x03:
  		ccf1 = ccfs2;
  		break;
  	case 0x10:
  		ccf1 = ccfs1;
  		break;
  	case 0x11:
  	case 0x12:
  		if (!ccfs1)
  			ccf1 = ccfs2;
  		else
  			ccf1 = ccfs1;
  		break;
  	case 0x13:
  	case 0x20:
  	case 0x23:
  		ccf1 = ccfs1;
  		break;
  	}
  
  	cf0 = ieee80211_channel_to_frequency(ccf0, chandef->chan->band);
  	cf1 = ieee80211_channel_to_frequency(ccf1, chandef->chan->band);
  
  	switch (oper->chan_width) {
  	case IEEE80211_VHT_CHANWIDTH_USE_HT:
  		/* just use HT information directly */
  		break;
  	case IEEE80211_VHT_CHANWIDTH_80MHZ:
  		new.width = NL80211_CHAN_WIDTH_80;
  		new.center_freq1 = cf0;
  		/* If needed, adjust based on the newer interop workaround. */
  		if (ccf1) {
  			unsigned int diff;
  
  			diff = abs(ccf1 - ccf0);
  			if ((diff == 8) && support_160) {
  				new.width = NL80211_CHAN_WIDTH_160;
  				new.center_freq1 = cf1;
  			} else if ((diff > 8) && support_80_80) {
  				new.width = NL80211_CHAN_WIDTH_80P80;
  				new.center_freq2 = cf1;
  			}
  		}
  		break;
  	case IEEE80211_VHT_CHANWIDTH_160MHZ:
  		/* deprecated encoding */
  		new.width = NL80211_CHAN_WIDTH_160;
  		new.center_freq1 = cf0;
  		break;
  	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
  		/* deprecated encoding */
  		new.width = NL80211_CHAN_WIDTH_80P80;
  		new.center_freq1 = cf0;
  		new.center_freq2 = cf1;
  		break;
  	default:
  		return false;
  	}
  
  	if (!cfg80211_chandef_valid(&new))
  		return false;
  
  	*chandef = new;
  	return true;
  }
  
  bool ieee80211_chandef_he_6ghz_oper(struct ieee80211_sub_if_data *sdata,
  				    const struct ieee80211_he_operation *he_oper,
  				    struct cfg80211_chan_def *chandef)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_supported_band *sband;
  	enum nl80211_iftype iftype = ieee80211_vif_type_p2p(&sdata->vif);
  	const struct ieee80211_sta_he_cap *he_cap;
  	struct cfg80211_chan_def he_chandef = *chandef;
  	const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
  	bool support_80_80, support_160;
  	u8 he_phy_cap;
  	u32 freq;
  
  	if (chandef->chan->band != NL80211_BAND_6GHZ)
  		return true;
  
  	sband = local->hw.wiphy->bands[NL80211_BAND_6GHZ];
  
  	he_cap = ieee80211_get_he_iftype_cap(sband, iftype);
  	if (!he_cap) {
  		sdata_info(sdata, "Missing iftype sband data/HE cap");
  		return false;
  	}
  
  	he_phy_cap = he_cap->he_cap_elem.phy_cap_info[0];
  	support_160 =
  		he_phy_cap &
  		IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
  	support_80_80 =
  		he_phy_cap &
  		IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
  
  	if (!he_oper) {
  		sdata_info(sdata,
  			   "HE is not advertised on (on %d MHz), expect issues\n",
  			   chandef->chan->center_freq);
  		return false;
  	}
  
  	he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
  
  	if (!he_6ghz_oper) {
  		sdata_info(sdata,
  			   "HE 6GHz operation missing (on %d MHz), expect issues\n",
  			   chandef->chan->center_freq);
  		return false;
  	}
  
  	freq = ieee80211_channel_to_frequency(he_6ghz_oper->primary,
  					      NL80211_BAND_6GHZ);
  	he_chandef.chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
  
  	switch (u8_get_bits(he_6ghz_oper->control,
  			    IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH)) {
  	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ:
  		he_chandef.width = NL80211_CHAN_WIDTH_20;
  		break;
  	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ:
  		he_chandef.width = NL80211_CHAN_WIDTH_40;
  		break;
  	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ:
  		he_chandef.width = NL80211_CHAN_WIDTH_80;
  		break;
  	case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ:
  		he_chandef.width = NL80211_CHAN_WIDTH_80;
  		if (!he_6ghz_oper->ccfs1)
  			break;
  		if (abs(he_6ghz_oper->ccfs1 - he_6ghz_oper->ccfs0) == 8) {
  			if (support_160)
  				he_chandef.width = NL80211_CHAN_WIDTH_160;
  		} else {
  			if (support_80_80)
  				he_chandef.width = NL80211_CHAN_WIDTH_80P80;
  		}
  		break;
  	}
  
  	if (he_chandef.width == NL80211_CHAN_WIDTH_160) {
  		he_chandef.center_freq1 =
  			ieee80211_channel_to_frequency(he_6ghz_oper->ccfs1,
  						       NL80211_BAND_6GHZ);
  	} else {
  		he_chandef.center_freq1 =
  			ieee80211_channel_to_frequency(he_6ghz_oper->ccfs0,
  						       NL80211_BAND_6GHZ);
  		if (support_80_80 || support_160)
  			he_chandef.center_freq2 =
  				ieee80211_channel_to_frequency(he_6ghz_oper->ccfs1,
  							       NL80211_BAND_6GHZ);
  	}
  
  	if (!cfg80211_chandef_valid(&he_chandef)) {
  		sdata_info(sdata,
  			   "HE 6GHz operation resulted in invalid chandef: %d MHz/%d/%d MHz/%d MHz\n",
  			   he_chandef.chan ? he_chandef.chan->center_freq : 0,
  			   he_chandef.width,
  			   he_chandef.center_freq1,
  			   he_chandef.center_freq2);
  		return false;
  	}
  
  	*chandef = he_chandef;
  
  	return true;
  }
  
  bool ieee80211_chandef_s1g_oper(const struct ieee80211_s1g_oper_ie *oper,
  				struct cfg80211_chan_def *chandef)
  {
  	u32 oper_freq;
  
  	if (!oper)
  		return false;
  
  	switch (FIELD_GET(S1G_OPER_CH_WIDTH_OPER, oper->ch_width)) {
  	case IEEE80211_S1G_CHANWIDTH_1MHZ:
  		chandef->width = NL80211_CHAN_WIDTH_1;
  		break;
  	case IEEE80211_S1G_CHANWIDTH_2MHZ:
  		chandef->width = NL80211_CHAN_WIDTH_2;
  		break;
  	case IEEE80211_S1G_CHANWIDTH_4MHZ:
  		chandef->width = NL80211_CHAN_WIDTH_4;
  		break;
  	case IEEE80211_S1G_CHANWIDTH_8MHZ:
  		chandef->width = NL80211_CHAN_WIDTH_8;
  		break;
  	case IEEE80211_S1G_CHANWIDTH_16MHZ:
  		chandef->width = NL80211_CHAN_WIDTH_16;
  		break;
  	default:
  		return false;
  	}
  
  	oper_freq = ieee80211_channel_to_freq_khz(oper->oper_ch,
  						  NL80211_BAND_S1GHZ);
  	chandef->center_freq1 = KHZ_TO_MHZ(oper_freq);
  	chandef->freq1_offset = oper_freq % 1000;
  
  	return true;
  }
  
  int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
  			     const struct ieee80211_supported_band *sband,
  			     const u8 *srates, int srates_len, u32 *rates)
  {
  	u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
  	int shift = ieee80211_chandef_get_shift(chandef);
  	struct ieee80211_rate *br;
  	int brate, rate, i, j, count = 0;
  
  	*rates = 0;
  
  	for (i = 0; i < srates_len; i++) {
  		rate = srates[i] & 0x7f;
  
  		for (j = 0; j < sband->n_bitrates; j++) {
  			br = &sband->bitrates[j];
  			if ((rate_flags & br->flags) != rate_flags)
  				continue;
  
  			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
  			if (brate == rate) {
  				*rates |= BIT(j);
  				count++;
  				break;
  			}
  		}
  	}
  	return count;
  }
  
  int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
  			    struct sk_buff *skb, bool need_basic,
  			    enum nl80211_band band)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_supported_band *sband;
  	int rate, shift;
  	u8 i, rates, *pos;
  	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
  	u32 rate_flags;
  
  	shift = ieee80211_vif_get_shift(&sdata->vif);
  	rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
  	sband = local->hw.wiphy->bands[band];
  	rates = 0;
  	for (i = 0; i < sband->n_bitrates; i++) {
  		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
  			continue;
  		rates++;
  	}
  	if (rates > 8)
  		rates = 8;
  
  	if (skb_tailroom(skb) < rates + 2)
  		return -ENOMEM;
  
  	pos = skb_put(skb, rates + 2);
  	*pos++ = WLAN_EID_SUPP_RATES;
  	*pos++ = rates;
  	for (i = 0; i < rates; i++) {
  		u8 basic = 0;
  		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
  			continue;
  
  		if (need_basic && basic_rates & BIT(i))
  			basic = 0x80;
  		rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
  				    5 * (1 << shift));
  		*pos++ = basic | (u8) rate;
  	}
  
  	return 0;
  }
  
  int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
  				struct sk_buff *skb, bool need_basic,
  				enum nl80211_band band)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_supported_band *sband;
  	int rate, shift;
  	u8 i, exrates, *pos;
  	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
  	u32 rate_flags;
  
  	rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
  	shift = ieee80211_vif_get_shift(&sdata->vif);
  
  	sband = local->hw.wiphy->bands[band];
  	exrates = 0;
  	for (i = 0; i < sband->n_bitrates; i++) {
  		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
  			continue;
  		exrates++;
  	}
  
  	if (exrates > 8)
  		exrates -= 8;
  	else
  		exrates = 0;
  
  	if (skb_tailroom(skb) < exrates + 2)
  		return -ENOMEM;
  
  	if (exrates) {
  		pos = skb_put(skb, exrates + 2);
  		*pos++ = WLAN_EID_EXT_SUPP_RATES;
  		*pos++ = exrates;
  		for (i = 8; i < sband->n_bitrates; i++) {
  			u8 basic = 0;
  			if ((rate_flags & sband->bitrates[i].flags)
  			    != rate_flags)
  				continue;
  			if (need_basic && basic_rates & BIT(i))
  				basic = 0x80;
  			rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
  					    5 * (1 << shift));
  			*pos++ = basic | (u8) rate;
  		}
  	}
  	return 0;
  }
  
  int ieee80211_ave_rssi(struct ieee80211_vif *vif)
  {
  	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
  	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  
  	if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
  		/* non-managed type inferfaces */
  		return 0;
  	}
  	return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
  }
  EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
  
  u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
  {
  	if (!mcs)
  		return 1;
  
  	/* TODO: consider rx_highest */
  
  	if (mcs->rx_mask[3])
  		return 4;
  	if (mcs->rx_mask[2])
  		return 3;
  	if (mcs->rx_mask[1])
  		return 2;
  	return 1;
  }
  
  /**
   * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
   * @local: mac80211 hw info struct
   * @status: RX status
   * @mpdu_len: total MPDU length (including FCS)
   * @mpdu_offset: offset into MPDU to calculate timestamp at
   *
   * This function calculates the RX timestamp at the given MPDU offset, taking
   * into account what the RX timestamp was. An offset of 0 will just normalize
   * the timestamp to TSF at beginning of MPDU reception.
   */
  u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
  				     struct ieee80211_rx_status *status,
  				     unsigned int mpdu_len,
  				     unsigned int mpdu_offset)
  {
  	u64 ts = status->mactime;
  	struct rate_info ri;
  	u16 rate;
  	u8 n_ltf;
  
  	if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
  		return 0;
  
  	memset(&ri, 0, sizeof(ri));
  
  	ri.bw = status->bw;
  
  	/* Fill cfg80211 rate info */
  	switch (status->encoding) {
  	case RX_ENC_HE:
  		ri.flags |= RATE_INFO_FLAGS_HE_MCS;
  		ri.mcs = status->rate_idx;
  		ri.nss = status->nss;
  		ri.he_ru_alloc = status->he_ru;
  		if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
  			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
  
  		/*
  		 * See P802.11ax_D6.0, section 27.3.4 for
  		 * VHT PPDU format.
  		 */
  		if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
  			mpdu_offset += 2;
  			ts += 36;
  
  			/*
  			 * TODO:
  			 * For HE MU PPDU, add the HE-SIG-B.
  			 * For HE ER PPDU, add 8us for the HE-SIG-A.
  			 * For HE TB PPDU, add 4us for the HE-STF.
  			 * Add the HE-LTF durations - variable.
  			 */
  		}
  
  		break;
  	case RX_ENC_HT:
  		ri.mcs = status->rate_idx;
  		ri.flags |= RATE_INFO_FLAGS_MCS;
  		if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
  			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
  
  		/*
  		 * See P802.11REVmd_D3.0, section 19.3.2 for
  		 * HT PPDU format.
  		 */
  		if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
  			mpdu_offset += 2;
  			if (status->enc_flags & RX_ENC_FLAG_HT_GF)
  				ts += 24;
  			else
  				ts += 32;
  
  			/*
  			 * Add Data HT-LTFs per streams
  			 * TODO: add Extension HT-LTFs, 4us per LTF
  			 */
  			n_ltf = ((ri.mcs >> 3) & 3) + 1;
  			n_ltf = n_ltf == 3 ? 4 : n_ltf;
  			ts += n_ltf * 4;
  		}
  
  		break;
  	case RX_ENC_VHT:
  		ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
  		ri.mcs = status->rate_idx;
  		ri.nss = status->nss;
  		if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
  			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
  
  		/*
  		 * See P802.11REVmd_D3.0, section 21.3.2 for
  		 * VHT PPDU format.
  		 */
  		if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
  			mpdu_offset += 2;
  			ts += 36;
  
  			/*
  			 * Add VHT-LTFs per streams
  			 */
  			n_ltf = (ri.nss != 1) && (ri.nss % 2) ?
  				ri.nss + 1 : ri.nss;
  			ts += 4 * n_ltf;
  		}
  
  		break;
  	default:
  		WARN_ON(1);
  		fallthrough;
  	case RX_ENC_LEGACY: {
  		struct ieee80211_supported_band *sband;
  		int shift = 0;
  		int bitrate;
  
  		switch (status->bw) {
  		case RATE_INFO_BW_10:
  			shift = 1;
  			break;
  		case RATE_INFO_BW_5:
  			shift = 2;
  			break;
  		}
  
  		sband = local->hw.wiphy->bands[status->band];
  		bitrate = sband->bitrates[status->rate_idx].bitrate;
  		ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
  
  		if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
  			if (status->band == NL80211_BAND_5GHZ) {
  				ts += 20 << shift;
  				mpdu_offset += 2;
  			} else if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) {
  				ts += 96;
  			} else {
  				ts += 192;
  			}
  		}
  		break;
  		}
  	}
  
  	rate = cfg80211_calculate_bitrate(&ri);
  	if (WARN_ONCE(!rate,
  		      "Invalid bitrate: flags=0x%llx, idx=%d, vht_nss=%d\n",
  		      (unsigned long long)status->flag, status->rate_idx,
  		      status->nss))
  		return 0;
  
  	/* rewind from end of MPDU */
  	if (status->flag & RX_FLAG_MACTIME_END)
  		ts -= mpdu_len * 8 * 10 / rate;
  
  	ts += mpdu_offset * 8 * 10 / rate;
  
  	return ts;
  }
  
  void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
  {
  	struct ieee80211_sub_if_data *sdata;
  	struct cfg80211_chan_def chandef;
  
  	/* for interface list, to avoid linking iflist_mtx and chanctx_mtx */
  	lockdep_assert_wiphy(local->hw.wiphy);
  
  	mutex_lock(&local->mtx);
  	list_for_each_entry(sdata, &local->interfaces, list) {
  		/* it might be waiting for the local->mtx, but then
  		 * by the time it gets it, sdata->wdev.cac_started
  		 * will no longer be true
  		 */
  		cancel_delayed_work(&sdata->dfs_cac_timer_work);
  
  		if (sdata->wdev.cac_started) {
  			chandef = sdata->vif.bss_conf.chandef;
  			ieee80211_vif_release_channel(sdata);
  			cfg80211_cac_event(sdata->dev,
  					   &chandef,
  					   NL80211_RADAR_CAC_ABORTED,
  					   GFP_KERNEL);
  		}
  	}
  	mutex_unlock(&local->mtx);
  }
  
  void ieee80211_dfs_radar_detected_work(struct work_struct *work)
  {
  	struct ieee80211_local *local =
  		container_of(work, struct ieee80211_local, radar_detected_work);
  	struct cfg80211_chan_def chandef = local->hw.conf.chandef;
  	struct ieee80211_chanctx *ctx;
  	int num_chanctx = 0;
  
  	mutex_lock(&local->chanctx_mtx);
  	list_for_each_entry(ctx, &local->chanctx_list, list) {
  		if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
  			continue;
  
  		num_chanctx++;
  		chandef = ctx->conf.def;
  	}
  	mutex_unlock(&local->chanctx_mtx);
  
  	wiphy_lock(local->hw.wiphy);
  	ieee80211_dfs_cac_cancel(local);
  	wiphy_unlock(local->hw.wiphy);
  
  	if (num_chanctx > 1)
  		/* XXX: multi-channel is not supported yet */
  		WARN_ON(1);
  	else
  		cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
  }
  
  void ieee80211_radar_detected(struct ieee80211_hw *hw)
  {
  	struct ieee80211_local *local = hw_to_local(hw);
  
  	trace_api_radar_detected(local);
  
  	schedule_work(&local->radar_detected_work);
  }
  EXPORT_SYMBOL(ieee80211_radar_detected);
  
  u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
  {
  	u32 ret;
  	int tmp;
  
  	switch (c->width) {
  	case NL80211_CHAN_WIDTH_20:
  		c->width = NL80211_CHAN_WIDTH_20_NOHT;
  		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
  		break;
  	case NL80211_CHAN_WIDTH_40:
  		c->width = NL80211_CHAN_WIDTH_20;
  		c->center_freq1 = c->chan->center_freq;
  		ret = IEEE80211_STA_DISABLE_40MHZ |
  		      IEEE80211_STA_DISABLE_VHT;
  		break;
  	case NL80211_CHAN_WIDTH_80:
  		tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
  		/* n_P40 */
  		tmp /= 2;
  		/* freq_P40 */
  		c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
  		c->width = NL80211_CHAN_WIDTH_40;
  		ret = IEEE80211_STA_DISABLE_VHT;
  		break;
  	case NL80211_CHAN_WIDTH_80P80:
  		c->center_freq2 = 0;
  		c->width = NL80211_CHAN_WIDTH_80;
  		ret = IEEE80211_STA_DISABLE_80P80MHZ |
  		      IEEE80211_STA_DISABLE_160MHZ;
  		break;
  	case NL80211_CHAN_WIDTH_160:
  		/* n_P20 */
  		tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
  		/* n_P80 */
  		tmp /= 4;
  		c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
  		c->width = NL80211_CHAN_WIDTH_80;
  		ret = IEEE80211_STA_DISABLE_80P80MHZ |
  		      IEEE80211_STA_DISABLE_160MHZ;
  		break;
  	default:
  	case NL80211_CHAN_WIDTH_20_NOHT:
  		WARN_ON_ONCE(1);
  		c->width = NL80211_CHAN_WIDTH_20_NOHT;
  		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
  		break;
  	case NL80211_CHAN_WIDTH_1:
  	case NL80211_CHAN_WIDTH_2:
  	case NL80211_CHAN_WIDTH_4:
  	case NL80211_CHAN_WIDTH_8:
  	case NL80211_CHAN_WIDTH_16:
  	case NL80211_CHAN_WIDTH_5:
  	case NL80211_CHAN_WIDTH_10:
  		WARN_ON_ONCE(1);
  		/* keep c->width */
  		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
  		break;
  	}
  
  	WARN_ON_ONCE(!cfg80211_chandef_valid(c));
  
  	return ret;
  }
  
  /*
   * Returns true if smps_mode_new is strictly more restrictive than
   * smps_mode_old.
   */
  bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
  				   enum ieee80211_smps_mode smps_mode_new)
  {
  	if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
  			 smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
  		return false;
  
  	switch (smps_mode_old) {
  	case IEEE80211_SMPS_STATIC:
  		return false;
  	case IEEE80211_SMPS_DYNAMIC:
  		return smps_mode_new == IEEE80211_SMPS_STATIC;
  	case IEEE80211_SMPS_OFF:
  		return smps_mode_new != IEEE80211_SMPS_OFF;
  	default:
  		WARN_ON(1);
  	}
  
  	return false;
  }
  
  int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
  			      struct cfg80211_csa_settings *csa_settings)
  {
  	struct sk_buff *skb;
  	struct ieee80211_mgmt *mgmt;
  	struct ieee80211_local *local = sdata->local;
  	int freq;
  	int hdr_len = offsetofend(struct ieee80211_mgmt,
  				  u.action.u.chan_switch);
  	u8 *pos;
  
  	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
  	    sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
  		return -EOPNOTSUPP;
  
  	skb = dev_alloc_skb(local->tx_headroom + hdr_len +
  			    5 + /* channel switch announcement element */
  			    3 + /* secondary channel offset element */
  			    5 + /* wide bandwidth channel switch announcement */
  			    8); /* mesh channel switch parameters element */
  	if (!skb)
  		return -ENOMEM;
  
  	skb_reserve(skb, local->tx_headroom);
  	mgmt = skb_put_zero(skb, hdr_len);
  	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
  					  IEEE80211_STYPE_ACTION);
  
  	eth_broadcast_addr(mgmt->da);
  	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
  	if (ieee80211_vif_is_mesh(&sdata->vif)) {
  		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
  	} else {
  		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  		memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
  	}
  	mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
  	mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
  	pos = skb_put(skb, 5);
  	*pos++ = WLAN_EID_CHANNEL_SWITCH;			/* EID */
  	*pos++ = 3;						/* IE length */
  	*pos++ = csa_settings->block_tx ? 1 : 0;		/* CSA mode */
  	freq = csa_settings->chandef.chan->center_freq;
  	*pos++ = ieee80211_frequency_to_channel(freq);		/* channel */
  	*pos++ = csa_settings->count;				/* count */
  
  	if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
  		enum nl80211_channel_type ch_type;
  
  		skb_put(skb, 3);
  		*pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;	/* EID */
  		*pos++ = 1;					/* IE length */
  		ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
  		if (ch_type == NL80211_CHAN_HT40PLUS)
  			*pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
  		else
  			*pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
  	}
  
  	if (ieee80211_vif_is_mesh(&sdata->vif)) {
  		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  
  		skb_put(skb, 8);
  		*pos++ = WLAN_EID_CHAN_SWITCH_PARAM;		/* EID */
  		*pos++ = 6;					/* IE length */
  		*pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;	/* Mesh TTL */
  		*pos = 0x00;	/* Mesh Flag: Tx Restrict, Initiator, Reason */
  		*pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
  		*pos++ |= csa_settings->block_tx ?
  			  WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
  		put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
  		pos += 2;
  		put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
  		pos += 2;
  	}
  
  	if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_80 ||
  	    csa_settings->chandef.width == NL80211_CHAN_WIDTH_80P80 ||
  	    csa_settings->chandef.width == NL80211_CHAN_WIDTH_160) {
  		skb_put(skb, 5);
  		ieee80211_ie_build_wide_bw_cs(pos, &csa_settings->chandef);
  	}
  
  	ieee80211_tx_skb(sdata, skb);
  	return 0;
  }
  
  bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
  {
  	return !(cs == NULL || cs->cipher == 0 ||
  		 cs->hdr_len < cs->pn_len + cs->pn_off ||
  		 cs->hdr_len <= cs->key_idx_off ||
  		 cs->key_idx_shift > 7 ||
  		 cs->key_idx_mask == 0);
  }
  
  bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
  {
  	int i;
  
  	/* Ensure we have enough iftype bitmap space for all iftype values */
  	WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
  
  	for (i = 0; i < n; i++)
  		if (!ieee80211_cs_valid(&cs[i]))
  			return false;
  
  	return true;
  }
  
  const struct ieee80211_cipher_scheme *
  ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
  		 enum nl80211_iftype iftype)
  {
  	const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
  	int n = local->hw.n_cipher_schemes;
  	int i;
  	const struct ieee80211_cipher_scheme *cs = NULL;
  
  	for (i = 0; i < n; i++) {
  		if (l[i].cipher == cipher) {
  			cs = &l[i];
  			break;
  		}
  	}
  
  	if (!cs || !(cs->iftype & BIT(iftype)))
  		return NULL;
  
  	return cs;
  }
  
  int ieee80211_cs_headroom(struct ieee80211_local *local,
  			  struct cfg80211_crypto_settings *crypto,
  			  enum nl80211_iftype iftype)
  {
  	const struct ieee80211_cipher_scheme *cs;
  	int headroom = IEEE80211_ENCRYPT_HEADROOM;
  	int i;
  
  	for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
  		cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
  				      iftype);
  
  		if (cs && headroom < cs->hdr_len)
  			headroom = cs->hdr_len;
  	}
  
  	cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
  	if (cs && headroom < cs->hdr_len)
  		headroom = cs->hdr_len;
  
  	return headroom;
  }
  
  static bool
  ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
  {
  	s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
  	int skip;
  
  	if (end > 0)
  		return false;
  
  	/* One shot NOA  */
  	if (data->count[i] == 1)
  		return false;
  
  	if (data->desc[i].interval == 0)
  		return false;
  
  	/* End time is in the past, check for repetitions */
  	skip = DIV_ROUND_UP(-end, data->desc[i].interval);
  	if (data->count[i] < 255) {
  		if (data->count[i] <= skip) {
  			data->count[i] = 0;
  			return false;
  		}
  
  		data->count[i] -= skip;
  	}
  
  	data->desc[i].start += skip * data->desc[i].interval;
  
  	return true;
  }
  
  static bool
  ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
  			     s32 *offset)
  {
  	bool ret = false;
  	int i;
  
  	for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
  		s32 cur;
  
  		if (!data->count[i])
  			continue;
  
  		if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
  			ret = true;
  
  		cur = data->desc[i].start - tsf;
  		if (cur > *offset)
  			continue;
  
  		cur = data->desc[i].start + data->desc[i].duration - tsf;
  		if (cur > *offset)
  			*offset = cur;
  	}
  
  	return ret;
  }
  
  static u32
  ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
  {
  	s32 offset = 0;
  	int tries = 0;
  	/*
  	 * arbitrary limit, used to avoid infinite loops when combined NoA
  	 * descriptors cover the full time period.
  	 */
  	int max_tries = 5;
  
  	ieee80211_extend_absent_time(data, tsf, &offset);
  	do {
  		if (!ieee80211_extend_absent_time(data, tsf, &offset))
  			break;
  
  		tries++;
  	} while (tries < max_tries);
  
  	return offset;
  }
  
  void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
  {
  	u32 next_offset = BIT(31) - 1;
  	int i;
  
  	data->absent = 0;
  	data->has_next_tsf = false;
  	for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
  		s32 start;
  
  		if (!data->count[i])
  			continue;
  
  		ieee80211_extend_noa_desc(data, tsf, i);
  		start = data->desc[i].start - tsf;
  		if (start <= 0)
  			data->absent |= BIT(i);
  
  		if (next_offset > start)
  			next_offset = start;
  
  		data->has_next_tsf = true;
  	}
  
  	if (data->absent)
  		next_offset = ieee80211_get_noa_absent_time(data, tsf);
  
  	data->next_tsf = tsf + next_offset;
  }
  EXPORT_SYMBOL(ieee80211_update_p2p_noa);
  
  int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
  			    struct ieee80211_noa_data *data, u32 tsf)
  {
  	int ret = 0;
  	int i;
  
  	memset(data, 0, sizeof(*data));
  
  	for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
  		const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
  
  		if (!desc->count || !desc->duration)
  			continue;
  
  		data->count[i] = desc->count;
  		data->desc[i].start = le32_to_cpu(desc->start_time);
  		data->desc[i].duration = le32_to_cpu(desc->duration);
  		data->desc[i].interval = le32_to_cpu(desc->interval);
  
  		if (data->count[i] > 1 &&
  		    data->desc[i].interval < data->desc[i].duration)
  			continue;
  
  		ieee80211_extend_noa_desc(data, tsf, i);
  		ret++;
  	}
  
  	if (ret)
  		ieee80211_update_p2p_noa(data, tsf);
  
  	return ret;
  }
  EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
  
  void ieee80211_recalc_dtim(struct ieee80211_local *local,
  			   struct ieee80211_sub_if_data *sdata)
  {
  	u64 tsf = drv_get_tsf(local, sdata);
  	u64 dtim_count = 0;
  	u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
  	u8 dtim_period = sdata->vif.bss_conf.dtim_period;
  	struct ps_data *ps;
  	u8 bcns_from_dtim;
  
  	if (tsf == -1ULL || !beacon_int || !dtim_period)
  		return;
  
  	if (sdata->vif.type == NL80211_IFTYPE_AP ||
  	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
  		if (!sdata->bss)
  			return;
  
  		ps = &sdata->bss->ps;
  	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
  		ps = &sdata->u.mesh.ps;
  	} else {
  		return;
  	}
  
  	/*
  	 * actually finds last dtim_count, mac80211 will update in
  	 * __beacon_add_tim().
  	 * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
  	 */
  	do_div(tsf, beacon_int);
  	bcns_from_dtim = do_div(tsf, dtim_period);
  	/* just had a DTIM */
  	if (!bcns_from_dtim)
  		dtim_count = 0;
  	else
  		dtim_count = dtim_period - bcns_from_dtim;
  
  	ps->dtim_count = dtim_count;
  }
  
  static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
  					 struct ieee80211_chanctx *ctx)
  {
  	struct ieee80211_sub_if_data *sdata;
  	u8 radar_detect = 0;
  
  	lockdep_assert_held(&local->chanctx_mtx);
  
  	if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
  		return 0;
  
  	list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
  		if (sdata->reserved_radar_required)
  			radar_detect |= BIT(sdata->reserved_chandef.width);
  
  	/*
  	 * An in-place reservation context should not have any assigned vifs
  	 * until it replaces the other context.
  	 */
  	WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
  		!list_empty(&ctx->assigned_vifs));
  
  	list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
  		if (sdata->radar_required)
  			radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
  
  	return radar_detect;
  }
  
  int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
  				 const struct cfg80211_chan_def *chandef,
  				 enum ieee80211_chanctx_mode chanmode,
  				 u8 radar_detect)
  {
  	struct ieee80211_local *local = sdata->local;
  	struct ieee80211_sub_if_data *sdata_iter;
  	enum nl80211_iftype iftype = sdata->wdev.iftype;
  	struct ieee80211_chanctx *ctx;
  	int total = 1;
  	struct iface_combination_params params = {
  		.radar_detect = radar_detect,
  	};
  
  	lockdep_assert_held(&local->chanctx_mtx);
  
  	if (WARN_ON(hweight32(radar_detect) > 1))
  		return -EINVAL;
  
  	if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
  		    !chandef->chan))
  		return -EINVAL;
  
  	if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
  		return -EINVAL;
  
  	if (sdata->vif.type == NL80211_IFTYPE_AP ||
  	    sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
  		/*
  		 * always passing this is harmless, since it'll be the
  		 * same value that cfg80211 finds if it finds the same
  		 * interface ... and that's always allowed
  		 */
  		params.new_beacon_int = sdata->vif.bss_conf.beacon_int;
  	}
  
  	/* Always allow software iftypes */
  	if (cfg80211_iftype_allowed(local->hw.wiphy, iftype, 0, 1)) {
  		if (radar_detect)
  			return -EINVAL;
  		return 0;
  	}
  
  	if (chandef)
  		params.num_different_channels = 1;
  
  	if (iftype != NL80211_IFTYPE_UNSPECIFIED)
  		params.iftype_num[iftype] = 1;
  
  	list_for_each_entry(ctx, &local->chanctx_list, list) {
  		if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
  			continue;
  		params.radar_detect |=
  			ieee80211_chanctx_radar_detect(local, ctx);
  		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
  			params.num_different_channels++;
  			continue;
  		}
  		if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
  		    cfg80211_chandef_compatible(chandef,
  						&ctx->conf.def))
  			continue;
  		params.num_different_channels++;
  	}
  
  	list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
  		struct wireless_dev *wdev_iter;
  
  		wdev_iter = &sdata_iter->wdev;
  
  		if (sdata_iter == sdata ||
  		    !ieee80211_sdata_running(sdata_iter) ||
  		    cfg80211_iftype_allowed(local->hw.wiphy,
  					    wdev_iter->iftype, 0, 1))
  			continue;
  
  		params.iftype_num[wdev_iter->iftype]++;
  		total++;
  	}
  
  	if (total == 1 && !params.radar_detect)
  		return 0;
  
  	return cfg80211_check_combinations(local->hw.wiphy, &params);
  }
  
  static void
  ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
  			 void *data)
  {
  	u32 *max_num_different_channels = data;
  
  	*max_num_different_channels = max(*max_num_different_channels,
  					  c->num_different_channels);
  }
  
  int ieee80211_max_num_channels(struct ieee80211_local *local)
  {
  	struct ieee80211_sub_if_data *sdata;
  	struct ieee80211_chanctx *ctx;
  	u32 max_num_different_channels = 1;
  	int err;
  	struct iface_combination_params params = {0};
  
  	lockdep_assert_held(&local->chanctx_mtx);
  
  	list_for_each_entry(ctx, &local->chanctx_list, list) {
  		if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
  			continue;
  
  		params.num_different_channels++;
  
  		params.radar_detect |=
  			ieee80211_chanctx_radar_detect(local, ctx);
  	}
  
  	list_for_each_entry_rcu(sdata, &local->interfaces, list)
  		params.iftype_num[sdata->wdev.iftype]++;
  
  	err = cfg80211_iter_combinations(local->hw.wiphy, &params,
  					 ieee80211_iter_max_chans,
  					 &max_num_different_channels);
  	if (err < 0)
  		return err;
  
  	return max_num_different_channels;
  }
  
  void ieee80211_add_s1g_capab_ie(struct ieee80211_sub_if_data *sdata,
  				struct ieee80211_sta_s1g_cap *caps,
  				struct sk_buff *skb)
  {
  	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  	struct ieee80211_s1g_cap s1g_capab;
  	u8 *pos;
  	int i;
  
  	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
  		return;
  
  	if (!caps->s1g)
  		return;
  
  	memcpy(s1g_capab.capab_info, caps->cap, sizeof(caps->cap));
  	memcpy(s1g_capab.supp_mcs_nss, caps->nss_mcs, sizeof(caps->nss_mcs));
  
  	/* override the capability info */
  	for (i = 0; i < sizeof(ifmgd->s1g_capa.capab_info); i++) {
  		u8 mask = ifmgd->s1g_capa_mask.capab_info[i];
  
  		s1g_capab.capab_info[i] &= ~mask;
  		s1g_capab.capab_info[i] |= ifmgd->s1g_capa.capab_info[i] & mask;
  	}
  
  	/* then MCS and NSS set */
  	for (i = 0; i < sizeof(ifmgd->s1g_capa.supp_mcs_nss); i++) {
  		u8 mask = ifmgd->s1g_capa_mask.supp_mcs_nss[i];
  
  		s1g_capab.supp_mcs_nss[i] &= ~mask;
  		s1g_capab.supp_mcs_nss[i] |=
  			ifmgd->s1g_capa.supp_mcs_nss[i] & mask;
  	}
  
  	pos = skb_put(skb, 2 + sizeof(s1g_capab));
  	*pos++ = WLAN_EID_S1G_CAPABILITIES;
  	*pos++ = sizeof(s1g_capab);
  
  	memcpy(pos, &s1g_capab, sizeof(s1g_capab));
  }
  
  void ieee80211_add_aid_request_ie(struct ieee80211_sub_if_data *sdata,
  				  struct sk_buff *skb)
  {
  	u8 *pos = skb_put(skb, 3);
  
  	*pos++ = WLAN_EID_AID_REQUEST;
  	*pos++ = 1;
  	*pos++ = 0;
  }
  
  u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
  {
  	*buf++ = WLAN_EID_VENDOR_SPECIFIC;
  	*buf++ = 7; /* len */
  	*buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
  	*buf++ = 0x50;
  	*buf++ = 0xf2;
  	*buf++ = 2; /* WME */
  	*buf++ = 0; /* WME info */
  	*buf++ = 1; /* WME ver */
  	*buf++ = qosinfo; /* U-APSD no in use */
  
  	return buf;
  }
  
  void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
  			     unsigned long *frame_cnt,
  			     unsigned long *byte_cnt)
  {
  	struct txq_info *txqi = to_txq_info(txq);
  	u32 frag_cnt = 0, frag_bytes = 0;
  	struct sk_buff *skb;
  
  	skb_queue_walk(&txqi->frags, skb) {
  		frag_cnt++;
  		frag_bytes += skb->len;
  	}
  
  	if (frame_cnt)
  		*frame_cnt = txqi->tin.backlog_packets + frag_cnt;
  
  	if (byte_cnt)
  		*byte_cnt = txqi->tin.backlog_bytes + frag_bytes;
  }
  EXPORT_SYMBOL(ieee80211_txq_get_depth);
  
  const u8 ieee80211_ac_to_qos_mask[IEEE80211_NUM_ACS] = {
  	IEEE80211_WMM_IE_STA_QOSINFO_AC_VO,
  	IEEE80211_WMM_IE_STA_QOSINFO_AC_VI,
  	IEEE80211_WMM_IE_STA_QOSINFO_AC_BE,
  	IEEE80211_WMM_IE_STA_QOSINFO_AC_BK
  };
  
  u16 ieee80211_encode_usf(int listen_interval)
  {
  	static const int listen_int_usf[] = { 1, 10, 1000, 10000 };
  	u16 ui, usf = 0;
  
  	/* find greatest USF */
  	while (usf < IEEE80211_MAX_USF) {
  		if (listen_interval % listen_int_usf[usf + 1])
  			break;
  		usf += 1;
  	}
  	ui = listen_interval / listen_int_usf[usf];
  
  	/* error if there is a remainder. Should've been checked by user */
  	WARN_ON_ONCE(ui > IEEE80211_MAX_UI);
  	listen_interval = FIELD_PREP(LISTEN_INT_USF, usf) |
  			  FIELD_PREP(LISTEN_INT_UI, ui);
  
  	return (u16) listen_interval;
  }
  