// SPDX-License-Identifier: GPL-2.0
/*
 * This file contains helper code to handle channel
 * settings and keeping track of what is possible at
 * any point in time.
 *
 * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright 2018-2025  Intel Corporation
 */

#include <linux/export.h>
#include <linux/bitfield.h>
#include <net/cfg80211.h>
#include "core.h"
#include "rdev-ops.h"

static bool cfg80211_valid_60g_freq(u32 freq)
{
        return freq >= 58320 && freq <= 70200;
}

void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
                             struct ieee80211_channel *chan,
                             enum nl80211_channel_type chan_type)
{
        if (WARN_ON(!chan))
                return;

        *chandef = (struct cfg80211_chan_def) {
                .chan = chan,
                .freq1_offset = chan->freq_offset,
        };

        switch (chan_type) {
        case NL80211_CHAN_NO_HT:
                chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
                chandef->center_freq1 = chan->center_freq;
                break;
        case NL80211_CHAN_HT20:
                chandef->width = NL80211_CHAN_WIDTH_20;
                chandef->center_freq1 = chan->center_freq;
                break;
        case NL80211_CHAN_HT40PLUS:
                chandef->width = NL80211_CHAN_WIDTH_40;
                chandef->center_freq1 = chan->center_freq + 10;
                break;
        case NL80211_CHAN_HT40MINUS:
                chandef->width = NL80211_CHAN_WIDTH_40;
                chandef->center_freq1 = chan->center_freq - 10;
                break;
        default:
                WARN_ON(1);
        }
}
EXPORT_SYMBOL(cfg80211_chandef_create);

static u32 cfg80211_get_start_freq(const struct cfg80211_chan_def *chandef,
                                   u32 cf)
{
        u32 start_freq, center_freq, bandwidth;

        center_freq = MHZ_TO_KHZ((cf == 1) ?
                        chandef->center_freq1 : chandef->center_freq2);
        bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef));

        if (bandwidth <= MHZ_TO_KHZ(20))
                start_freq = center_freq;
        else
                start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);

        return start_freq;
}

static u32 cfg80211_get_end_freq(const struct cfg80211_chan_def *chandef,
                                 u32 cf)
{
        u32 end_freq, center_freq, bandwidth;

        center_freq = MHZ_TO_KHZ((cf == 1) ?
                        chandef->center_freq1 : chandef->center_freq2);
        bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef));

        if (bandwidth <= MHZ_TO_KHZ(20))
                end_freq = center_freq;
        else
                end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);

        return end_freq;
}

#define for_each_subchan(chandef, freq, cf)                             \
        for (u32 punctured = chandef->punctured,                        \
             cf = 1, freq = cfg80211_get_start_freq(chandef, cf);       \
             freq <= cfg80211_get_end_freq(chandef, cf);                \
             freq += MHZ_TO_KHZ(20),                                    \
             ((cf == 1 && chandef->center_freq2 != 0 &&                 \
               freq > cfg80211_get_end_freq(chandef, cf)) ?             \
              (cf++, freq = cfg80211_get_start_freq(chandef, cf),       \
               punctured = 0) : (punctured >>= 1)))                     \
                if (!(punctured & 1))

#define for_each_s1g_subchan(chandef, freq_khz)                   \
        for (freq_khz = cfg80211_s1g_get_start_freq_khz(chandef); \
             freq_khz <= cfg80211_s1g_get_end_freq_khz(chandef);  \
             freq_khz += MHZ_TO_KHZ(1))

struct cfg80211_per_bw_puncturing_values {
        u8 len;
        const u16 *valid_values;
};

static const u16 puncturing_values_80mhz[] = {
        0x8, 0x4, 0x2, 0x1
};

static const u16 puncturing_values_160mhz[] = {
         0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3
};

static const u16 puncturing_values_320mhz[] = {
        0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00,
        0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f,
        0x300f, 0xc0f, 0x30f, 0xcf, 0x3f
};

#define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \
        { \
                .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \
                .valid_values = puncturing_values_ ## _bw ## mhz \
        }

static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = {
        CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80),
        CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160),
        CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320)
};

static bool valid_puncturing_bitmap(const struct cfg80211_chan_def *chandef)
{
        u32 idx, i, start_freq, primary_center = chandef->chan->center_freq;

        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_80:
                idx = 0;
                start_freq = chandef->center_freq1 - 40;
                break;
        case NL80211_CHAN_WIDTH_160:
                idx = 1;
                start_freq = chandef->center_freq1 - 80;
                break;
        case NL80211_CHAN_WIDTH_320:
                idx = 2;
                start_freq = chandef->center_freq1 - 160;
                break;
        default:
                return chandef->punctured == 0;
        }

        if (!chandef->punctured)
                return true;

        /* check if primary channel is punctured */
        if (chandef->punctured & (u16)BIT((primary_center - start_freq) / 20))
                return false;

        for (i = 0; i < per_bw_puncturing[idx].len; i++) {
                if (per_bw_puncturing[idx].valid_values[i] == chandef->punctured)
                        return true;
        }

        return false;
}

static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef)
{
        int max_contiguous = 0;
        int num_of_enabled = 0;
        int contiguous = 0;
        int i;

        if (!chandef->edmg.channels || !chandef->edmg.bw_config)
                return false;

        if (!cfg80211_valid_60g_freq(chandef->chan->center_freq))
                return false;

        for (i = 0; i < 6; i++) {
                if (chandef->edmg.channels & BIT(i)) {
                        contiguous++;
                        num_of_enabled++;
                } else {
                        contiguous = 0;
                }

                max_contiguous = max(contiguous, max_contiguous);
        }
        /* basic verification of edmg configuration according to
         * IEEE P802.11ay/D4.0 section 9.4.2.251
         */
        /* check bw_config against contiguous edmg channels */
        switch (chandef->edmg.bw_config) {
        case IEEE80211_EDMG_BW_CONFIG_4:
        case IEEE80211_EDMG_BW_CONFIG_8:
        case IEEE80211_EDMG_BW_CONFIG_12:
                if (max_contiguous < 1)
                        return false;
                break;
        case IEEE80211_EDMG_BW_CONFIG_5:
        case IEEE80211_EDMG_BW_CONFIG_9:
        case IEEE80211_EDMG_BW_CONFIG_13:
                if (max_contiguous < 2)
                        return false;
                break;
        case IEEE80211_EDMG_BW_CONFIG_6:
        case IEEE80211_EDMG_BW_CONFIG_10:
        case IEEE80211_EDMG_BW_CONFIG_14:
                if (max_contiguous < 3)
                        return false;
                break;
        case IEEE80211_EDMG_BW_CONFIG_7:
        case IEEE80211_EDMG_BW_CONFIG_11:
        case IEEE80211_EDMG_BW_CONFIG_15:
                if (max_contiguous < 4)
                        return false;
                break;

        default:
                return false;
        }

        /* check bw_config against aggregated (non contiguous) edmg channels */
        switch (chandef->edmg.bw_config) {
        case IEEE80211_EDMG_BW_CONFIG_4:
        case IEEE80211_EDMG_BW_CONFIG_5:
        case IEEE80211_EDMG_BW_CONFIG_6:
        case IEEE80211_EDMG_BW_CONFIG_7:
                break;
        case IEEE80211_EDMG_BW_CONFIG_8:
        case IEEE80211_EDMG_BW_CONFIG_9:
        case IEEE80211_EDMG_BW_CONFIG_10:
        case IEEE80211_EDMG_BW_CONFIG_11:
                if (num_of_enabled < 2)
                        return false;
                break;
        case IEEE80211_EDMG_BW_CONFIG_12:
        case IEEE80211_EDMG_BW_CONFIG_13:
        case IEEE80211_EDMG_BW_CONFIG_14:
        case IEEE80211_EDMG_BW_CONFIG_15:
                if (num_of_enabled < 4 || max_contiguous < 2)
                        return false;
                break;
        default:
                return false;
        }

        return true;
}

int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width)
{
        int mhz;

        switch (chan_width) {
        case NL80211_CHAN_WIDTH_1:
                mhz = 1;
                break;
        case NL80211_CHAN_WIDTH_2:
                mhz = 2;
                break;
        case NL80211_CHAN_WIDTH_4:
                mhz = 4;
                break;
        case NL80211_CHAN_WIDTH_8:
                mhz = 8;
                break;
        case NL80211_CHAN_WIDTH_16:
                mhz = 16;
                break;
        case NL80211_CHAN_WIDTH_5:
                mhz = 5;
                break;
        case NL80211_CHAN_WIDTH_10:
                mhz = 10;
                break;
        case NL80211_CHAN_WIDTH_20:
        case NL80211_CHAN_WIDTH_20_NOHT:
                mhz = 20;
                break;
        case NL80211_CHAN_WIDTH_40:
                mhz = 40;
                break;
        case NL80211_CHAN_WIDTH_80P80:
        case NL80211_CHAN_WIDTH_80:
                mhz = 80;
                break;
        case NL80211_CHAN_WIDTH_160:
                mhz = 160;
                break;
        case NL80211_CHAN_WIDTH_320:
                mhz = 320;
                break;
        default:
                WARN_ON_ONCE(1);
                return -1;
        }
        return mhz;
}
EXPORT_SYMBOL(nl80211_chan_width_to_mhz);

static bool cfg80211_valid_center_freq(u32 center,
                                       enum nl80211_chan_width width)
{
        int bw;
        int step;

        /* We only do strict verification on 6 GHz */
        if (center < 5955 || center > 7115)
                return true;

        bw = nl80211_chan_width_to_mhz(width);
        if (bw < 0)
                return false;

        /* Validate that the channels bw is entirely within the 6 GHz band */
        if (center - bw / 2 < 5945 || center + bw / 2 > 7125)
                return false;

        /* With 320 MHz the permitted channels overlap */
        if (bw == 320)
                step = 160;
        else
                step = bw;

        /*
         * Valid channels are packed from lowest frequency towards higher ones.
         * So test that the lower frequency aligns with one of these steps.
         */
        return (center - bw / 2 - 5945) % step == 0;
}

bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
        u32 control_freq, control_freq_khz, start_khz, end_khz;

        if (!chandef->chan)
                return false;

        if (chandef->freq1_offset >= 1000)
                return false;

        control_freq = chandef->chan->center_freq;

        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_5:
        case NL80211_CHAN_WIDTH_10:
        case NL80211_CHAN_WIDTH_20:
        case NL80211_CHAN_WIDTH_20_NOHT:
                if (ieee80211_chandef_to_khz(chandef) !=
                    ieee80211_channel_to_khz(chandef->chan))
                        return false;
                if (chandef->center_freq2)
                        return false;
                break;
        case NL80211_CHAN_WIDTH_1:
        case NL80211_CHAN_WIDTH_2:
        case NL80211_CHAN_WIDTH_4:
        case NL80211_CHAN_WIDTH_8:
        case NL80211_CHAN_WIDTH_16:
                if (!cfg80211_chandef_is_s1g(chandef))
                        return false;
                if (chandef->center_freq2)
                        return false;

                control_freq_khz = ieee80211_channel_to_khz(chandef->chan);
                start_khz = cfg80211_s1g_get_start_freq_khz(chandef);
                end_khz = cfg80211_s1g_get_end_freq_khz(chandef);

                if (control_freq_khz < start_khz || control_freq_khz > end_khz)
                        return false;
                break;
        case NL80211_CHAN_WIDTH_80P80:
                if (!chandef->center_freq2)
                        return false;
                /* adjacent is not allowed -- that's a 160 MHz channel */
                if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
                    chandef->center_freq2 - chandef->center_freq1 == 80)
                        return false;
                break;
        default:
                if (chandef->center_freq2)
                        return false;
                break;
        }

        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_5:
        case NL80211_CHAN_WIDTH_10:
        case NL80211_CHAN_WIDTH_20:
        case NL80211_CHAN_WIDTH_20_NOHT:
        case NL80211_CHAN_WIDTH_1:
        case NL80211_CHAN_WIDTH_2:
        case NL80211_CHAN_WIDTH_4:
        case NL80211_CHAN_WIDTH_8:
        case NL80211_CHAN_WIDTH_16:
                /* all checked above */
                break;
        case NL80211_CHAN_WIDTH_320:
                if (chandef->center_freq1 == control_freq + 150 ||
                    chandef->center_freq1 == control_freq + 130 ||
                    chandef->center_freq1 == control_freq + 110 ||
                    chandef->center_freq1 == control_freq + 90 ||
                    chandef->center_freq1 == control_freq - 90 ||
                    chandef->center_freq1 == control_freq - 110 ||
                    chandef->center_freq1 == control_freq - 130 ||
                    chandef->center_freq1 == control_freq - 150)
                        break;
                fallthrough;
        case NL80211_CHAN_WIDTH_160:
                if (chandef->center_freq1 == control_freq + 70 ||
                    chandef->center_freq1 == control_freq + 50 ||
                    chandef->center_freq1 == control_freq - 50 ||
                    chandef->center_freq1 == control_freq - 70)
                        break;
                fallthrough;
        case NL80211_CHAN_WIDTH_80P80:
        case NL80211_CHAN_WIDTH_80:
                if (chandef->center_freq1 == control_freq + 30 ||
                    chandef->center_freq1 == control_freq - 30)
                        break;
                fallthrough;
        case NL80211_CHAN_WIDTH_40:
                if (chandef->center_freq1 == control_freq + 10 ||
                    chandef->center_freq1 == control_freq - 10)
                        break;
                fallthrough;
        default:
                return false;
        }

        if (!cfg80211_valid_center_freq(chandef->center_freq1, chandef->width))
                return false;

        if (chandef->width == NL80211_CHAN_WIDTH_80P80 &&
            !cfg80211_valid_center_freq(chandef->center_freq2, chandef->width))
                return false;

        /* channel 14 is only for IEEE 802.11b */
        if (chandef->center_freq1 == 2484 &&
            chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
                return false;

        if (cfg80211_chandef_is_edmg(chandef) &&
            !cfg80211_edmg_chandef_valid(chandef))
                return false;

        if (!cfg80211_chandef_is_s1g(chandef) && chandef->s1g_primary_2mhz)
                return false;

        return valid_puncturing_bitmap(chandef);
}
EXPORT_SYMBOL(cfg80211_chandef_valid);

int cfg80211_chandef_primary(const struct cfg80211_chan_def *c,
                             enum nl80211_chan_width primary_chan_width,
                             u16 *punctured)
{
        int pri_width = nl80211_chan_width_to_mhz(primary_chan_width);
        int width = cfg80211_chandef_get_width(c);
        u32 control = c->chan->center_freq;
        u32 center = c->center_freq1;
        u16 _punct = 0;

        if (WARN_ON_ONCE(pri_width < 0 || width < 0))
                return -1;

        /* not intended to be called this way, can't determine */
        if (WARN_ON_ONCE(pri_width > width))
                return -1;

        if (!punctured)
                punctured = &_punct;

        *punctured = c->punctured;

        while (width > pri_width) {
                unsigned int bits_to_drop = width / 20 / 2;

                if (control > center) {
                        center += width / 4;
                        *punctured >>= bits_to_drop;
                } else {
                        center -= width / 4;
                        *punctured &= (1 << bits_to_drop) - 1;
                }
                width /= 2;
        }

        return center;
}
EXPORT_SYMBOL(cfg80211_chandef_primary);

static const struct cfg80211_chan_def *
check_chandef_primary_compat(const struct cfg80211_chan_def *c1,
                             const struct cfg80211_chan_def *c2,
                             enum nl80211_chan_width primary_chan_width)
{
        u16 punct_c1 = 0, punct_c2 = 0;

        /* check primary is compatible -> error if not */
        if (cfg80211_chandef_primary(c1, primary_chan_width, &punct_c1) !=
            cfg80211_chandef_primary(c2, primary_chan_width, &punct_c2))
                return ERR_PTR(-EINVAL);

        if (punct_c1 != punct_c2)
                return ERR_PTR(-EINVAL);

        /* assumes c1 is smaller width, if that was just checked -> done */
        if (c1->width == primary_chan_width)
                return c2;

        /* otherwise continue checking the next width */
        return NULL;
}

static const struct cfg80211_chan_def *
_cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
                             const struct cfg80211_chan_def *c2)
{
        const struct cfg80211_chan_def *ret;

        /* If they are identical, return */
        if (cfg80211_chandef_identical(c1, c2))
                return c2;

        /* otherwise, must have same control channel */
        if (c1->chan != c2->chan)
                return NULL;

        /*
         * If they have the same width, but aren't identical,
         * then they can't be compatible.
         */
        if (c1->width == c2->width)
                return NULL;

        /*
         * can't be compatible if one of them is 5/10 MHz or S1G
         * but they don't have the same width.
         */
#define NARROW_OR_S1G(width)    ((width) == NL80211_CHAN_WIDTH_5 || \
                                 (width) == NL80211_CHAN_WIDTH_10 || \
                                 (width) == NL80211_CHAN_WIDTH_1 || \
                                 (width) == NL80211_CHAN_WIDTH_2 || \
                                 (width) == NL80211_CHAN_WIDTH_4 || \
                                 (width) == NL80211_CHAN_WIDTH_8 || \
                                 (width) == NL80211_CHAN_WIDTH_16)

        if (NARROW_OR_S1G(c1->width) || NARROW_OR_S1G(c2->width))
                return NULL;

        /*
         * Make sure that c1 is always the narrower one, so that later
         * we either return NULL or c2 and don't have to check both
         * directions.
         */
        if (c1->width > c2->width)
                swap(c1, c2);

        /*
         * No further checks needed if the "narrower" one is only 20 MHz.
         * Here "narrower" includes being a 20 MHz non-HT channel vs. a
         * 20 MHz HT (or later) one.
         */
        if (c1->width <= NL80211_CHAN_WIDTH_20)
                return c2;

        ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_40);
        if (ret)
                return ret;

        ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_80);
        if (ret)
                return ret;

        /*
         * If c1 is 80+80, then c2 is 160 or higher, but that cannot
         * match. If c2 was also 80+80 it was already either accepted
         * or rejected above (identical or not, respectively.)
         */
        if (c1->width == NL80211_CHAN_WIDTH_80P80)
                return NULL;

        ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_160);
        if (ret)
                return ret;

        /*
         * Getting here would mean they're both wider than 160, have the
         * same primary 160, but are not identical - this cannot happen
         * since they must be 320 (no wider chandefs exist, at least yet.)
         */
        WARN_ON_ONCE(1);

        return NULL;
}

const struct cfg80211_chan_def *
cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
                            const struct cfg80211_chan_def *c2)
{
        const struct cfg80211_chan_def *ret;

        ret = _cfg80211_chandef_compatible(c1, c2);
        if (IS_ERR(ret))
                return NULL;
        return ret;
}
EXPORT_SYMBOL(cfg80211_chandef_compatible);

void cfg80211_set_dfs_state(struct wiphy *wiphy,
                            const struct cfg80211_chan_def *chandef,
                            enum nl80211_dfs_state dfs_state)
{
        struct ieee80211_channel *c;
        int width;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return;

        width = cfg80211_chandef_get_width(chandef);
        if (width < 0)
                return;

        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
                        continue;

                c->dfs_state = dfs_state;
                c->dfs_state_entered = jiffies;
        }
}

static bool
cfg80211_dfs_permissive_check_wdev(struct cfg80211_registered_device *rdev,
                                   enum nl80211_iftype iftype,
                                   struct wireless_dev *wdev,
                                   struct ieee80211_channel *chan)
{
        unsigned int link_id;

        for_each_valid_link(wdev, link_id) {
                struct ieee80211_channel *other_chan = NULL;
                struct cfg80211_chan_def chandef = {};
                int ret;

                /* In order to avoid daisy chaining only allow BSS STA */
                if (wdev->iftype != NL80211_IFTYPE_STATION ||
                    !wdev->links[link_id].client.current_bss)
                        continue;

                other_chan =
                        wdev->links[link_id].client.current_bss->pub.channel;

                if (!other_chan)
                        continue;

                if (chan == other_chan)
                        return true;

                /* continue if we can't get the channel */
                ret = rdev_get_channel(rdev, wdev, link_id, &chandef);
                if (ret)
                        continue;

                if (cfg80211_is_sub_chan(&chandef, chan, false))
                        return true;
        }

        return false;
}

/*
 * Check if P2P GO is allowed to operate on a DFS channel
 */
static bool cfg80211_dfs_permissive_chan(struct wiphy *wiphy,
                                         enum nl80211_iftype iftype,
                                         struct ieee80211_channel *chan)
{
        struct wireless_dev *wdev;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        lockdep_assert_held(&rdev->wiphy.mtx);

        if (!wiphy_ext_feature_isset(&rdev->wiphy,
                                     NL80211_EXT_FEATURE_DFS_CONCURRENT) ||
            !(chan->flags & IEEE80211_CHAN_DFS_CONCURRENT))
                return false;

        /* only valid for P2P GO */
        if (iftype != NL80211_IFTYPE_P2P_GO)
                return false;

        /*
         * Allow only if there's a concurrent BSS
         */
        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                bool ret = cfg80211_dfs_permissive_check_wdev(rdev, iftype,
                                                              wdev, chan);
                if (ret)
                        return ret;
        }

        return false;
}

static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
                                           const struct cfg80211_chan_def *chandef,
                                           enum nl80211_iftype iftype)
{
        struct ieee80211_channel *c;

        /* DFS is not required for S1G */
        if (cfg80211_chandef_is_s1g(chandef))
                return 0;

        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c)
                        return -EINVAL;

                if (c->flags & IEEE80211_CHAN_RADAR &&
                    !cfg80211_dfs_permissive_chan(wiphy, iftype, c))
                        return 1;
        }

        return 0;
}


int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
                                  const struct cfg80211_chan_def *chandef,
                                  enum nl80211_iftype iftype)
{
        int width;
        int ret;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return -EINVAL;

        switch (iftype) {
        case NL80211_IFTYPE_ADHOC:
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
        case NL80211_IFTYPE_MESH_POINT:
                width = cfg80211_chandef_get_width(chandef);
                if (width < 0)
                        return -EINVAL;

                ret = cfg80211_get_chans_dfs_required(wiphy, chandef, iftype);

                return (ret > 0) ? BIT(chandef->width) : ret;
                break;
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_OCB:
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_MONITOR:
        case NL80211_IFTYPE_AP_VLAN:
        case NL80211_IFTYPE_P2P_DEVICE:
        case NL80211_IFTYPE_NAN:
                break;
        case NL80211_IFTYPE_WDS:
        case NL80211_IFTYPE_UNSPECIFIED:
        case NUM_NL80211_IFTYPES:
                WARN_ON(1);
        }

        return 0;
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_required);

bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
                                 const struct cfg80211_chan_def *chandef)
{
        struct ieee80211_channel *c;
        int width, count = 0;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return false;

        width = cfg80211_chandef_get_width(chandef);
        if (width < 0)
                return false;

        /*
         * Check entire range of channels for the bandwidth.
         * Check all channels are DFS channels (DFS_USABLE or
         * DFS_AVAILABLE). Return number of usable channels
         * (require CAC). Allow DFS and non-DFS channel mix.
         */
        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c)
                        return false;

                if (c->flags & IEEE80211_CHAN_DISABLED)
                        return false;

                if (c->flags & IEEE80211_CHAN_RADAR) {
                        if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
                                return false;

                        if (c->dfs_state == NL80211_DFS_USABLE)
                                count++;
                }
        }

        return count > 0;
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_usable);

/*
 * Checks if center frequency of chan falls with in the bandwidth
 * range of chandef.
 */
bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
                          struct ieee80211_channel *chan,
                          bool primary_only)
{
        int width;
        u32 freq;

        if (!chandef->chan)
                return false;

        if (chandef->chan->center_freq == chan->center_freq)
                return true;

        if (primary_only)
                return false;

        width = cfg80211_chandef_get_width(chandef);
        if (width <= 20)
                return false;

        for (freq = chandef->center_freq1 - width / 2 + 10;
             freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
                if (chan->center_freq == freq)
                        return true;
        }

        if (!chandef->center_freq2)
                return false;

        for (freq = chandef->center_freq2 - width / 2 + 10;
             freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
                if (chan->center_freq == freq)
                        return true;
        }

        return false;
}

bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
{
        unsigned int link;

        lockdep_assert_wiphy(wdev->wiphy);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
                for_each_valid_link(wdev, link) {
                        if (wdev->links[link].ap.beacon_interval)
                                return true;
                }
                break;
        case NL80211_IFTYPE_ADHOC:
                if (wdev->u.ibss.ssid_len)
                        return true;
                break;
        case NL80211_IFTYPE_MESH_POINT:
                if (wdev->u.mesh.id_len)
                        return true;
                break;
        case NL80211_IFTYPE_STATION:
        case NL80211_IFTYPE_OCB:
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_MONITOR:
        case NL80211_IFTYPE_AP_VLAN:
        case NL80211_IFTYPE_P2P_DEVICE:
        /* Can NAN type be considered as beaconing interface? */
        case NL80211_IFTYPE_NAN:
                break;
        case NL80211_IFTYPE_UNSPECIFIED:
        case NL80211_IFTYPE_WDS:
        case NUM_NL80211_IFTYPES:
                WARN_ON(1);
        }

        return false;
}

bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev,
                               struct ieee80211_channel *chan,
                               bool primary_only)
{
        unsigned int link;

        switch (wdev->iftype) {
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
                for_each_valid_link(wdev, link) {
                        if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef,
                                                 chan, primary_only))
                                return true;
                }
                break;
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan,
                                            primary_only);
        case NL80211_IFTYPE_MESH_POINT:
                return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan,
                                            primary_only);
        default:
                break;
        }

        return false;
}

static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
                                        struct ieee80211_channel *chan)
{
        struct wireless_dev *wdev;

        lockdep_assert_wiphy(wiphy);

        list_for_each_entry(wdev, &wiphy->wdev_list, list) {
                if (!cfg80211_beaconing_iface_active(wdev))
                        continue;

                if (cfg80211_wdev_on_sub_chan(wdev, chan, false))
                        return true;
        }

        return false;
}

static bool
cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
                                 struct ieee80211_channel *channel)
{
        if (!rdev->background_radar_wdev)
                return false;

        if (!cfg80211_chandef_valid(&rdev->background_radar_chandef))
                return false;

        return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel,
                                    false);
}

bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
                                  struct ieee80211_channel *chan)
{
        struct cfg80211_registered_device *rdev;

        ASSERT_RTNL();

        if (!(chan->flags & IEEE80211_CHAN_RADAR))
                return false;

        for_each_rdev(rdev) {
                bool found;

                if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
                        continue;

                guard(wiphy)(&rdev->wiphy);

                found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) ||
                        cfg80211_offchan_chain_is_active(rdev, chan);

                if (found)
                        return true;
        }

        return false;
}

static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
                                const struct cfg80211_chan_def *chandef)
{
        struct ieee80211_channel *c;
        int width;
        bool dfs_offload;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return false;

        width = cfg80211_chandef_get_width(chandef);
        if (width < 0)
                return false;

        dfs_offload = wiphy_ext_feature_isset(wiphy,
                                              NL80211_EXT_FEATURE_DFS_OFFLOAD);

        /*
         * Check entire range of channels for the bandwidth.
         * If any channel in between is disabled or has not
         * had gone through CAC return false
         */
        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c)
                        return false;

                if (c->flags & IEEE80211_CHAN_DISABLED)
                        return false;

                if ((c->flags & IEEE80211_CHAN_RADAR) &&
                    (c->dfs_state != NL80211_DFS_AVAILABLE) &&
                    !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
                        return false;
        }

        return true;
}

unsigned int
cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
                              const struct cfg80211_chan_def *chandef)
{
        struct ieee80211_channel *c;
        int width;
        unsigned int t1 = 0, t2 = 0;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return 0;

        width = cfg80211_chandef_get_width(chandef);
        if (width < 0)
                return 0;

        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c || (c->flags & IEEE80211_CHAN_DISABLED)) {
                        if (cf == 1)
                                t1 = INT_MAX;
                        else
                                t2 = INT_MAX;
                        continue;
                }

                if (!(c->flags & IEEE80211_CHAN_RADAR))
                        continue;

                if (cf == 1 && c->dfs_cac_ms > t1)
                        t1 = c->dfs_cac_ms;

                if (cf == 2 && c->dfs_cac_ms > t2)
                        t2 = c->dfs_cac_ms;
        }

        if (t1 == INT_MAX && t2 == INT_MAX)
                return 0;

        if (t1 == INT_MAX)
                return t2;

        if (t2 == INT_MAX)
                return t1;

        return max(t1, t2);
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time);

/* check if the operating channels are valid and supported */
static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
                                 enum ieee80211_edmg_bw_config edmg_bw_config,
                                 int primary_channel,
                                 struct ieee80211_edmg *edmg_cap)
{
        struct ieee80211_channel *chan;
        int i, freq;
        int channels_counter = 0;

        if (!edmg_channels && !edmg_bw_config)
                return true;

        if ((!edmg_channels && edmg_bw_config) ||
            (edmg_channels && !edmg_bw_config))
                return false;

        if (!(edmg_channels & BIT(primary_channel - 1)))
                return false;

        /* 60GHz channels 1..6 */
        for (i = 0; i < 6; i++) {
                if (!(edmg_channels & BIT(i)))
                        continue;

                if (!(edmg_cap->channels & BIT(i)))
                        return false;

                channels_counter++;

                freq = ieee80211_channel_to_frequency(i + 1,
                                                      NL80211_BAND_60GHZ);
                chan = ieee80211_get_channel(wiphy, freq);
                if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
                        return false;
        }

        /* IEEE802.11 allows max 4 channels */
        if (channels_counter > 4)
                return false;

        /* check bw_config is a subset of what driver supports
         * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
         */
        if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
                return false;

        if (edmg_bw_config > edmg_cap->bw_config)
                return false;

        return true;
}

static bool cfg80211_s1g_usable(struct wiphy *wiphy,
                                const struct cfg80211_chan_def *chandef)
{
        u32 freq_khz;
        const struct ieee80211_channel *chan;
        u32 pri_khz = ieee80211_channel_to_khz(chandef->chan);
        u32 end_khz = cfg80211_s1g_get_end_freq_khz(chandef);
        u32 start_khz = cfg80211_s1g_get_start_freq_khz(chandef);
        int width_mhz = cfg80211_chandef_get_width(chandef);
        u32 prohibited_flags = IEEE80211_CHAN_DISABLED;

        if (width_mhz >= 16)
                prohibited_flags |= IEEE80211_CHAN_NO_16MHZ;
        if (width_mhz >= 8)
                prohibited_flags |= IEEE80211_CHAN_NO_8MHZ;
        if (width_mhz >= 4)
                prohibited_flags |= IEEE80211_CHAN_NO_4MHZ;

        if (chandef->chan->flags & IEEE80211_CHAN_S1G_NO_PRIMARY)
                return false;

        if (pri_khz < start_khz || pri_khz > end_khz)
                return false;

        for_each_s1g_subchan(chandef, freq_khz) {
                chan = ieee80211_get_channel_khz(wiphy, freq_khz);
                if (!chan || (chan->flags & prohibited_flags))
                        return false;
        }

        if (chandef->s1g_primary_2mhz) {
                u32 sib_khz;
                const struct ieee80211_channel *sibling;

                sibling = cfg80211_s1g_get_primary_sibling(wiphy, chandef);
                if (!sibling)
                        return false;

                if (sibling->flags & IEEE80211_CHAN_S1G_NO_PRIMARY)
                        return false;

                sib_khz = ieee80211_channel_to_khz(sibling);
                if (sib_khz < start_khz || sib_khz > end_khz)
                        return false;
        }

        return true;
}

bool _cfg80211_chandef_usable(struct wiphy *wiphy,
                              const struct cfg80211_chan_def *chandef,
                              u32 prohibited_flags,
                              u32 permitting_flags)
{
        struct ieee80211_sta_ht_cap *ht_cap;
        struct ieee80211_sta_vht_cap *vht_cap;
        struct ieee80211_edmg *edmg_cap;
        u32 width, control_freq, cap;
        bool ext_nss_cap, support_80_80 = false, support_320 = false;
        const struct ieee80211_sband_iftype_data *iftd;
        struct ieee80211_supported_band *sband;
        struct ieee80211_channel *c;
        int i;

        if (WARN_ON(!cfg80211_chandef_valid(chandef)))
                return false;

        ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
        vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
        edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
        ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
                        IEEE80211_VHT_EXT_NSS_BW_CAPABLE;

        if (cfg80211_chandef_is_s1g(chandef))
                return cfg80211_s1g_usable(wiphy, chandef);

        if (edmg_cap->channels &&
            !cfg80211_edmg_usable(wiphy,
                                  chandef->edmg.channels,
                                  chandef->edmg.bw_config,
                                  chandef->chan->hw_value,
                                  edmg_cap))
                return false;

        control_freq = chandef->chan->center_freq;

        switch (chandef->width) {
        case NL80211_CHAN_WIDTH_5:
                width = 5;
                break;
        case NL80211_CHAN_WIDTH_10:
                prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
                width = 10;
                break;
        case NL80211_CHAN_WIDTH_20:
                if (!ht_cap->ht_supported &&
                    chandef->chan->band != NL80211_BAND_6GHZ)
                        return false;
                fallthrough;
        case NL80211_CHAN_WIDTH_20_NOHT:
                prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
                width = 20;
                break;
        case NL80211_CHAN_WIDTH_40:
                width = 40;
                if (chandef->chan->band == NL80211_BAND_6GHZ)
                        break;
                if (!ht_cap->ht_supported)
                        return false;
                if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
                    ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
                        return false;
                if (chandef->center_freq1 < control_freq &&
                    chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
                        return false;
                if (chandef->center_freq1 > control_freq &&
                    chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
                        return false;
                break;
        case NL80211_CHAN_WIDTH_80P80:
                cap = vht_cap->cap;
                support_80_80 =
                        (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
                        (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
                         cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
                        (ext_nss_cap &&
                         u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
                if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
                        return false;
                fallthrough;
        case NL80211_CHAN_WIDTH_80:
                prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
                width = 80;
                if (chandef->chan->band == NL80211_BAND_6GHZ)
                        break;
                if (!vht_cap->vht_supported)
                        return false;
                break;
        case NL80211_CHAN_WIDTH_160:
                prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
                width = 160;
                if (chandef->chan->band == NL80211_BAND_6GHZ)
                        break;
                if (!vht_cap->vht_supported)
                        return false;
                cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
                if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
                    cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
                    !(ext_nss_cap &&
                      (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
                        return false;
                break;
        case NL80211_CHAN_WIDTH_320:
                prohibited_flags |= IEEE80211_CHAN_NO_320MHZ;
                width = 320;

                if (chandef->chan->band != NL80211_BAND_6GHZ)
                        return false;

                sband = wiphy->bands[NL80211_BAND_6GHZ];
                if (!sband)
                        return false;

                for_each_sband_iftype_data(sband, i, iftd) {
                        if (!iftd->eht_cap.has_eht)
                                continue;

                        if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] &
                            IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
                                support_320 = true;
                                break;
                        }
                }

                if (!support_320)
                        return false;
                break;
        default:
                WARN_ON_ONCE(1);
                return false;
        }

        /*
         * TODO: What if there are only certain 80/160/80+80 MHz channels
         *       allowed by the driver, or only certain combinations?
         *       For 40 MHz the driver can set the NO_HT40 flags, but for
         *       80/160 MHz and in particular 80+80 MHz this isn't really
         *       feasible and we only have NO_80MHZ/NO_160MHZ so far but
         *       no way to cover 80+80 MHz or more complex restrictions.
         *       Note that such restrictions also need to be advertised to
         *       userspace, for example for P2P channel selection.
         */

        if (width > 20)
                prohibited_flags |= IEEE80211_CHAN_NO_OFDM;

        /* 5 and 10 MHz are only defined for the OFDM PHY */
        if (width < 20)
                prohibited_flags |= IEEE80211_CHAN_NO_OFDM;

        for_each_subchan(chandef, freq, cf) {
                c = ieee80211_get_channel_khz(wiphy, freq);
                if (!c)
                        return false;
                if (c->flags & permitting_flags)
                        continue;
                if (c->flags & prohibited_flags)
                        return false;
        }

        return true;
}

bool cfg80211_chandef_usable(struct wiphy *wiphy,
                             const struct cfg80211_chan_def *chandef,
                             u32 prohibited_flags)
{
        return _cfg80211_chandef_usable(wiphy, chandef, prohibited_flags, 0);
}
EXPORT_SYMBOL(cfg80211_chandef_usable);

static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype,
                                              struct wireless_dev *wdev,
                                              struct ieee80211_channel *chan)
{
        struct ieee80211_channel *other_chan = NULL;
        unsigned int link_id;
        int r1, r2;

        for_each_valid_link(wdev, link_id) {
                if (wdev->iftype == NL80211_IFTYPE_STATION &&
                    wdev->links[link_id].client.current_bss)
                        other_chan = wdev->links[link_id].client.current_bss->pub.channel;

                /*
                 * If a GO already operates on the same GO_CONCURRENT channel,
                 * this one (maybe the same one) can beacon as well. We allow
                 * the operation even if the station we relied on with
                 * GO_CONCURRENT is disconnected now. But then we must make sure
                 * we're not outdoor on an indoor-only channel.
                 */
                if (iftype == NL80211_IFTYPE_P2P_GO &&
                    wdev->iftype == NL80211_IFTYPE_P2P_GO &&
                    wdev->links[link_id].ap.beacon_interval &&
                    !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
                        other_chan = wdev->links[link_id].ap.chandef.chan;

                if (!other_chan)
                        continue;

                if (chan == other_chan)
                        return true;

                if (chan->band != NL80211_BAND_5GHZ &&
                    chan->band != NL80211_BAND_6GHZ)
                        continue;

                r1 = cfg80211_get_unii(chan->center_freq);
                r2 = cfg80211_get_unii(other_chan->center_freq);

                if (r1 != -EINVAL && r1 == r2) {
                        /*
                         * At some locations channels 149-165 are considered a
                         * bundle, but at other locations, e.g., Indonesia,
                         * channels 149-161 are considered a bundle while
                         * channel 165 is left out and considered to be in a
                         * different bundle. Thus, in case that there is a
                         * station interface connected to an AP on channel 165,
                         * it is assumed that channels 149-161 are allowed for
                         * GO operations. However, having a station interface
                         * connected to an AP on channels 149-161, does not
                         * allow GO operation on channel 165.
                         */
                        if (chan->center_freq == 5825 &&
                            other_chan->center_freq != 5825)
                                continue;
                        return true;
                }
        }

        return false;
}

/*
 * Check if the channel can be used under permissive conditions mandated by
 * some regulatory bodies, i.e., the channel is marked with
 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
 * associated to an AP on the same channel or on the same UNII band
 * (assuming that the AP is an authorized master).
 * In addition allow operation on a channel on which indoor operation is
 * allowed, iff we are currently operating in an indoor environment.
 */
static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
                                        enum nl80211_iftype iftype,
                                        struct ieee80211_channel *chan)
{
        struct wireless_dev *wdev;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        lockdep_assert_held(&rdev->wiphy.mtx);

        if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
            !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
                return false;

        /* only valid for GO and TDLS off-channel (station/p2p-CL) */
        if (iftype != NL80211_IFTYPE_P2P_GO &&
            iftype != NL80211_IFTYPE_STATION &&
            iftype != NL80211_IFTYPE_P2P_CLIENT)
                return false;

        if (regulatory_indoor_allowed() &&
            (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
                return true;

        if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
                return false;

        /*
         * Generally, it is possible to rely on another device/driver to allow
         * the IR concurrent relaxation, however, since the device can further
         * enforce the relaxation (by doing a similar verifications as this),
         * and thus fail the GO instantiation, consider only the interfaces of
         * the current registered device.
         */
        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                bool ret;

                ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan);
                if (ret)
                        return ret;
        }

        return false;
}

static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
                                     struct cfg80211_chan_def *chandef,
                                     enum nl80211_iftype iftype,
                                     u32 prohibited_flags,
                                     u32 permitting_flags)
{
        bool res, check_radar;
        int dfs_required;

        trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype,
                                      prohibited_flags,
                                      permitting_flags);

        if (!_cfg80211_chandef_usable(wiphy, chandef,
                                      IEEE80211_CHAN_DISABLED, 0))
                return false;

        dfs_required = cfg80211_chandef_dfs_required(wiphy, chandef, iftype);
        check_radar = dfs_required != 0;

        if (dfs_required > 0 &&
            cfg80211_chandef_dfs_available(wiphy, chandef)) {
                /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
                prohibited_flags &= ~IEEE80211_CHAN_NO_IR;
                check_radar = false;
        }

        if (check_radar &&
            !_cfg80211_chandef_usable(wiphy, chandef,
                                      IEEE80211_CHAN_RADAR, 0))
                return false;

        res = _cfg80211_chandef_usable(wiphy, chandef,
                                       prohibited_flags,
                                       permitting_flags);

        trace_cfg80211_return_bool(res);
        return res;
}

bool cfg80211_reg_check_beaconing(struct wiphy *wiphy,
                                  struct cfg80211_chan_def *chandef,
                                  struct cfg80211_beaconing_check_config *cfg)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        u32 permitting_flags = 0;
        bool check_no_ir = true;

        /*
         * Under certain conditions suggested by some regulatory bodies a
         * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
         * only if such relaxations are not enabled and the conditions are not
         * met.
         */
        if (cfg->relax) {
                lockdep_assert_held(&rdev->wiphy.mtx);
                check_no_ir = !cfg80211_ir_permissive_chan(wiphy, cfg->iftype,
                                                           chandef->chan);
        }

        if (cfg->reg_power == IEEE80211_REG_VLP_AP)
                permitting_flags |= IEEE80211_CHAN_ALLOW_6GHZ_VLP_AP;

        if ((cfg->iftype == NL80211_IFTYPE_P2P_GO ||
             cfg->iftype == NL80211_IFTYPE_AP) &&
            (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
             chandef->width == NL80211_CHAN_WIDTH_20))
                permitting_flags |= IEEE80211_CHAN_ALLOW_20MHZ_ACTIVITY;

        return _cfg80211_reg_can_beacon(wiphy, chandef, cfg->iftype,
                                        check_no_ir ? IEEE80211_CHAN_NO_IR : 0,
                                        permitting_flags);
}
EXPORT_SYMBOL(cfg80211_reg_check_beaconing);

int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
                                 struct net_device *dev,
                                 struct cfg80211_chan_def *chandef)
{
        if (!rdev->ops->set_monitor_channel)
                return -EOPNOTSUPP;
        if (!cfg80211_has_monitors_only(rdev))
                return -EBUSY;

        return rdev_set_monitor_channel(rdev, dev, chandef);
}

bool cfg80211_any_usable_channels(struct wiphy *wiphy,
                                  unsigned long sband_mask,
                                  u32 prohibited_flags)
{
        int idx;

        prohibited_flags |= IEEE80211_CHAN_DISABLED;

        for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
                struct ieee80211_supported_band *sband = wiphy->bands[idx];
                int chanidx;

                if (!sband)
                        continue;

                for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
                        struct ieee80211_channel *chan;

                        chan = &sband->channels[chanidx];

                        if (chan->flags & prohibited_flags)
                                continue;

                        return true;
                }
        }

        return false;
}
EXPORT_SYMBOL(cfg80211_any_usable_channels);

struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev,
                                       unsigned int link_id)
{
        lockdep_assert_wiphy(wdev->wiphy);

        WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id)));
        WARN_ON(!wdev->valid_links && link_id > 0);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_MESH_POINT:
                return &wdev->u.mesh.chandef;
        case NL80211_IFTYPE_ADHOC:
                return &wdev->u.ibss.chandef;
        case NL80211_IFTYPE_OCB:
                return &wdev->u.ocb.chandef;
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
                return &wdev->links[link_id].ap.chandef;
        default:
                return NULL;
        }
}
EXPORT_SYMBOL(wdev_chandef);