/*
 * 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) 2015-2016      Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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;
        BUG_ON(!wiphy);

        local = wiphy_priv(wiphy);
        return &local->hw;
}
EXPORT_SYMBOL(wiphy_to_ieee80211_hw);

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);

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->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 (local->ops->wake_tx_queue &&
                            (atomic_read(&sdata->txqs_len[ac]) >
                             local->hw.txq_ac_max_pending))
                                continue;

                        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)
{
        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);
}

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);
        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)
                                netif_stop_subqueue(sdata->dev, ac);
                }
        }
        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);
        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);
        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);

        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 (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_rtnl(
        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);

        ASSERT_RTNL();

        __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
                             iterator, data);
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);

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)
{
        struct ieee80211_sub_if_data *sdata;

        if (!vif)
                return NULL;

        sdata = vif_to_sdata(vif);

        if (!ieee80211_sdata_running(sdata) ||
            !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
                return NULL;

        return &sdata->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);

u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
                               struct ieee802_11_elems *elems,
                               u64 filter, u32 crc)
{
        size_t left = len;
        const u8 *pos = start;
        bool calc_crc = filter != 0;
        DECLARE_BITMAP(seen_elems, 256);
        const u8 *ie;

        bitmap_zero(seen_elems, 256);
        memset(elems, 0, sizeof(*elems));
        elems->ie_start = start;
        elems->total_len = len;

        while (left >= 2) {
                u8 id, elen;
                bool elem_parse_failed;

                id = *pos++;
                elen = *pos++;
                left -= 2;

                if (elen > left) {
                        elems->parse_error = true;
                        break;
                }

                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:
                /*
                 * 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;
                                left -= elen;
                                pos += elen;
                                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;
                        else
                                elem_parse_failed = true;
                        break;
                case WLAN_EID_OPMODE_NOTIF:
                        if (elen > 0)
                                elems->opmode_notif = pos;
                        else
                                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_TIMEOUT_INTERVAL:
                        if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
                                elems->timeout_int = (void *)pos;
                        else
                                elem_parse_failed = true;
                        break;
                default:
                        break;
                }

                if (elem_parse_failed)
                        elems->parse_error = true;
                else
                        __set_bit(id, seen_elems);

                left -= elen;
                pos += elen;
        }

        if (left != 0)
                elems->parse_error = true;

        return crc;
}

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;
                        }
                }

                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.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 = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
        memset(mgmt, 0, 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)
                memcpy(skb_put(skb, extra_len), 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 *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, bssid, 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 */
                memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
                       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 int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
                                         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)
{
        struct ieee80211_supported_band *sband;
        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);
        }

        /* insert custom IEs that go before HT */
        if (ie && ie_len) {
                static const u8 before_ht[] = {
                        WLAN_EID_SSID,
                        WLAN_EID_SUPP_RATES,
                        WLAN_EID_REQUEST,
                        WLAN_EID_EXT_SUPP_RATES,
                        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);
        }

        /*
         * If adding more here, adjust code in main.c
         * that calculates local->scan_ies_len.
         */

        /* insert custom IEs that go before VHT */
        if (ie && ie_len) {
                static const u8 before_vht[] = {
                        WLAN_EID_SSID,
                        WLAN_EID_SUPP_RATES,
                        WLAN_EID_REQUEST,
                        WLAN_EID_EXT_SUPP_RATES,
                        WLAN_EID_DS_PARAMS,
                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
                        WLAN_EID_HT_CAPABILITY,
                        WLAN_EID_BSS_COEX_2040,
                        WLAN_EID_EXT_CAPABILITY,
                        WLAN_EID_SSID_LIST,
                        WLAN_EID_CHANNEL_USAGE,
                        WLAN_EID_INTERWORKING,
                        /* mesh ID can't happen here */
                        /* 60 GHz can't happen here right now */
                };
                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);
        }

        return pos - buffer;
 out_err:
        WARN_ONCE(1, "not enough space for preq IEs\n");
        return pos - buffer;
}

int ieee80211_build_preq_ies(struct ieee80211_local *local, 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)
{
        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(local,
                                                             buffer + pos,
                                                             buffer_len - pos,
                                                             ie, ie_len, i,
                                                             rate_masks[i],
                                                             chandef,
                                                             &custom_ie_offset);
                        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,
                                          bool directed)
{
        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 (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(local, skb_tail_pointer(skb),
                                           skb_tailroom(skb), &dummy_ie_desc,
                                           ie, ie_len, BIT(chan->band),
                                           rate_masks, &chandef);
        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;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
                              const u8 *src, const u8 *dst,
                              const u8 *ssid, size_t ssid_len,
                              const u8 *ie, size_t ie_len,
                              u32 ratemask, bool directed, u32 tx_flags,
                              struct ieee80211_channel *channel, bool scan)
{
        struct sk_buff *skb;

        skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
                                        ssid, ssid_len,
                                        ie, ie_len, directed);
        if (skb) {
                IEEE80211_SKB_CB(skb)->flags |= tx_flags;
                if (scan)
                        ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
                else
                        ieee80211_tx_skb(sdata, 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];

        rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
        shift = ieee80211_vif_get_shift(&sdata->vif);

        if (WARN_ON(!sband))
                return 1;

        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);

        cfg80211_shutdown_all_interfaces(local->hw.wiphy);
}

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);
}

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;
                default:
                        ieee80211_reconfig_stations(sdata);
                        /* fall through */
                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;

                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;

                        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;
                        /* fall through */
                case NL80211_IFTYPE_AP:
                        changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;

                        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);
                        }

                        /* fall through */
                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_WDS:
                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:
                        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)
                        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_reset_crypto_tx_tailroom(sdata);

        list_for_each_entry(sdata, &local->interfaces, list)
                if (ieee80211_sdata_running(sdata))
                        ieee80211_enable_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_rtnl(local->hw.wiphy);

 wake_up:
        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);
        }

        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);
        }

        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_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);
}

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_seg1_idx = ieee80211_frequency_to_channel(
                                                        chandef->center_freq1);
        if (chandef->center_freq2)
                vht_oper->center_freq_seg2_idx =
                        ieee80211_frequency_to_channel(chandef->center_freq2);
        else
                vht_oper->center_freq_seg2_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_seg2_idx = vht_oper->center_freq_seg1_idx;
                if (chandef->chan->center_freq < chandef->center_freq1)
                        vht_oper->center_freq_seg1_idx -= 8;
                else
                        vht_oper->center_freq_seg1_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);
}

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(const struct ieee80211_vht_operation *oper,
                                struct cfg80211_chan_def *chandef)
{
        struct cfg80211_chan_def new = *chandef;
        int cf1, cf2;

        if (!oper)
                return false;

        cf1 = ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
                                             chandef->chan->band);
        cf2 = ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
                                             chandef->chan->band);

        switch (oper->chan_width) {
        case IEEE80211_VHT_CHANWIDTH_USE_HT:
                break;
        case IEEE80211_VHT_CHANWIDTH_80MHZ:
                new.width = NL80211_CHAN_WIDTH_80;
                new.center_freq1 = cf1;
                /* If needed, adjust based on the newer interop workaround. */
                if (oper->center_freq_seg2_idx) {
                        unsigned int diff;

                        diff = abs(oper->center_freq_seg2_idx -
                                   oper->center_freq_seg1_idx);
                        if (diff == 8) {
                                new.width = NL80211_CHAN_WIDTH_160;
                                new.center_freq1 = cf2;
                        } else if (diff > 8) {
                                new.width = NL80211_CHAN_WIDTH_80P80;
                                new.center_freq2 = cf2;
                        }
                }
                break;
        case IEEE80211_VHT_CHANWIDTH_160MHZ:
                new.width = NL80211_CHAN_WIDTH_160;
                new.center_freq1 = cf1;
                break;
        case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
                new.width = NL80211_CHAN_WIDTH_80P80;
                new.center_freq1 = cf1;
                new.center_freq2 = cf2;
                break;
        default:
                return false;
        }

        if (!cfg80211_chandef_valid(&new))
                return false;

        *chandef = new;
        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 = sband->bitrates[i].bitrate;
                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;

        if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
                return 0;

        memset(&ri, 0, sizeof(ri));

        /* Fill cfg80211 rate info */
        if (status->flag & RX_FLAG_HT) {
                ri.mcs = status->rate_idx;
                ri.flags |= RATE_INFO_FLAGS_MCS;
                if (status->flag & RX_FLAG_40MHZ)
                        ri.bw = RATE_INFO_BW_40;
                else
                        ri.bw = RATE_INFO_BW_20;
                if (status->flag & RX_FLAG_SHORT_GI)
                        ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
        } else if (status->flag & RX_FLAG_VHT) {
                ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
                ri.mcs = status->rate_idx;
                ri.nss = status->vht_nss;
                if (status->flag & RX_FLAG_40MHZ)
                        ri.bw = RATE_INFO_BW_40;
                else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
                        ri.bw = RATE_INFO_BW_80;
                else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
                        ri.bw = RATE_INFO_BW_160;
                else
                        ri.bw = RATE_INFO_BW_20;
                if (status->flag & RX_FLAG_SHORT_GI)
                        ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
        } else {
                struct ieee80211_supported_band *sband;
                int shift = 0;
                int bitrate;

                if (status->flag & RX_FLAG_10MHZ) {
                        shift = 1;
                        ri.bw = RATE_INFO_BW_10;
                } else if (status->flag & RX_FLAG_5MHZ) {
                        shift = 2;
                        ri.bw = RATE_INFO_BW_5;
                } else {
                        ri.bw = RATE_INFO_BW_20;
                }

                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) {
                        /* TODO: handle HT/VHT preambles */
                        if (status->band == NL80211_BAND_5GHZ) {
                                ts += 20 << shift;
                                mpdu_offset += 2;
                        } else if (status->flag & RX_FLAG_SHORTPRE) {
                                ts += 96;
                        } else {
                                ts += 192;
                        }
                }
        }

        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->vht_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;

        mutex_lock(&local->mtx);
        mutex_lock(&local->iflist_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->iflist_mtx);
        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);

        ieee80211_dfs_cac_cancel(local);

        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);

        ieee80211_queue_work(hw, &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_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 = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
                               sizeof(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 */
                            8); /* mesh channel switch parameters element */
        if (!skb)
                return -ENOMEM;

        skb_reserve(skb, local->tx_headroom);
        mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
        memset(mgmt, 0, 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;
        }

        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;