// SPDX-License-Identifier: GPL-2.0-only
/*
 * This is the linux wireless configuration interface.
 *
 * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright 2015-2017  Intel Deutschland GmbH
 * Copyright (C) 2018-2025 Intel Corporation
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"
#include "debugfs.h"
#include "wext-compat.h"
#include "rdev-ops.h"

/* name for sysfs, %d is appended */
#define PHY_NAME "phy"

/* maximum length of radio debugfs directory name */
#define RADIO_DEBUGFSDIR_MAX_LEN        8

MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");
MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);

/* RCU-protected (and RTNL for writers) */
LIST_HEAD(cfg80211_rdev_list);
int cfg80211_rdev_list_generation;

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

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

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

struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx)
{
        struct cfg80211_registered_device *result = NULL, *rdev;

        ASSERT_RTNL();

        for_each_rdev(rdev) {
                if (rdev->wiphy_idx == wiphy_idx) {
                        result = rdev;
                        break;
                }
        }

        return result;
}

int get_wiphy_idx(struct wiphy *wiphy)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        return rdev->wiphy_idx;
}

struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
{
        struct cfg80211_registered_device *rdev;

        ASSERT_RTNL();

        rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx);
        if (!rdev)
                return NULL;
        return &rdev->wiphy;
}

static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
                                   const char *newname)
{
        struct cfg80211_registered_device *rdev2;
        int wiphy_idx, taken = -1, digits;

        ASSERT_RTNL();

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

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

        /* Ensure another device does not already have this name. */
        for_each_rdev(rdev2)
                if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
                        return -EINVAL;

        return 0;
}

int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
                        char *newname)
{
        int result;

        ASSERT_RTNL();
        lockdep_assert_wiphy(&rdev->wiphy);

        /* Ignore nop renames */
        if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
                return 0;

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

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

        debugfs_change_name(rdev->wiphy.debugfsdir, "%s", newname);

        nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);

        return 0;
}

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

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

        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                if (!wdev->netdev)
                        continue;
                wdev->netdev->netns_immutable = false;
                err = dev_change_net_namespace(wdev->netdev, net, "wlan%d");
                if (err)
                        break;
                wdev->netdev->netns_immutable = true;
        }

        if (err) {
                /* failed -- clean up to old netns */
                net = wiphy_net(&rdev->wiphy);

                list_for_each_entry_continue_reverse(wdev,
                                                     &rdev->wiphy.wdev_list,
                                                     list) {
                        if (!wdev->netdev)
                                continue;
                        wdev->netdev->netns_immutable = false;
                        err = dev_change_net_namespace(wdev->netdev, net,
                                                        "wlan%d");
                        WARN_ON(err);
                        wdev->netdev->netns_immutable = true;
                }

                return err;
        }

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

        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                if (!wdev->netdev)
                        continue;
                nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);
        }

        nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);

        wiphy_net_set(&rdev->wiphy, net);

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

        nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);

        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                if (!wdev->netdev)
                        continue;
                nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
        }

        return 0;
}

static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data)
{
        struct cfg80211_registered_device *rdev = data;

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

        rdev_rfkill_poll(rdev);
}

void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev,
                              struct wireless_dev *wdev)
{
        lockdep_assert_held(&rdev->wiphy.mtx);

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

        if (!wdev_running(wdev))
                return;

        rdev_stop_p2p_device(rdev, wdev);
        wdev->is_running = false;

        rdev->opencount--;

        if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) {
                if (WARN_ON(!rdev->scan_req->notified &&
                            (!rdev->int_scan_req ||
                             !rdev->int_scan_req->notified)))
                        rdev->scan_req->info.aborted = true;
                ___cfg80211_scan_done(rdev, false);
        }
}

void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,
                       struct wireless_dev *wdev)
{
        lockdep_assert_held(&rdev->wiphy.mtx);

        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_NAN))
                return;

        if (!wdev_running(wdev))
                return;

        rdev_stop_nan(rdev, wdev);
        wdev->is_running = false;

        eth_zero_addr(wdev->u.nan.cluster_id);

        rdev->opencount--;
}

void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        struct wireless_dev *wdev;

        ASSERT_RTNL();

        list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                if (wdev->netdev) {
                        dev_close(wdev->netdev);
                        continue;
                }

                /* otherwise, check iftype */

                guard(wiphy)(wiphy);

                switch (wdev->iftype) {
                case NL80211_IFTYPE_P2P_DEVICE:
                        cfg80211_stop_p2p_device(rdev, wdev);
                        break;
                case NL80211_IFTYPE_NAN:
                        cfg80211_stop_nan(rdev, wdev);
                        break;
                default:
                        break;
                }
        }
}
EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);

static int cfg80211_rfkill_set_block(void *data, bool blocked)
{
        struct cfg80211_registered_device *rdev = data;

        if (!blocked)
                return 0;

        rtnl_lock();
        cfg80211_shutdown_all_interfaces(&rdev->wiphy);
        rtnl_unlock();

        return 0;
}

static void cfg80211_rfkill_block_work(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev;

        rdev = container_of(work, struct cfg80211_registered_device,
                            rfkill_block);
        cfg80211_rfkill_set_block(rdev, true);
}

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

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

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

        cfg80211_process_rdev_events(rdev);
}

void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev)
{
        struct wireless_dev *wdev, *tmp;

        ASSERT_RTNL();

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

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

                        cfg80211_leave(rdev, wdev, -1);
                        cfg80211_remove_virtual_intf(rdev, wdev);
                }
        }
}

static void cfg80211_destroy_iface_wk(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev;

        rdev = container_of(work, struct cfg80211_registered_device,
                            destroy_work);

        rtnl_lock();
        cfg80211_destroy_ifaces(rdev);
        rtnl_unlock();
}

static void cfg80211_sched_scan_stop_wk(struct wiphy *wiphy,
                                        struct wiphy_work *work)
{
        struct cfg80211_registered_device *rdev;
        struct cfg80211_sched_scan_request *req, *tmp;

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

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

static void cfg80211_propagate_radar_detect_wk(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev;

        rdev = container_of(work, struct cfg80211_registered_device,
                            propagate_radar_detect_wk);

        rtnl_lock();

        regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->radar_chandef,
                                       NL80211_DFS_UNAVAILABLE,
                                       NL80211_RADAR_DETECTED);

        rtnl_unlock();
}

static void cfg80211_propagate_cac_done_wk(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev;

        rdev = container_of(work, struct cfg80211_registered_device,
                            propagate_cac_done_wk);

        rtnl_lock();

        regulatory_propagate_dfs_state(&rdev->wiphy, &rdev->cac_done_chandef,
                                       NL80211_DFS_AVAILABLE,
                                       NL80211_RADAR_CAC_FINISHED);

        rtnl_unlock();
}

static void cfg80211_wiphy_work(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev;
        struct wiphy_work *wk;

        rdev = container_of(work, struct cfg80211_registered_device, wiphy_work);

        trace_wiphy_work_worker_start(&rdev->wiphy);

        guard(wiphy)(&rdev->wiphy);
        if (rdev->suspended)
                return;

        spin_lock_irq(&rdev->wiphy_work_lock);
        wk = list_first_entry_or_null(&rdev->wiphy_work_list,
                                      struct wiphy_work, entry);
        if (wk) {
                list_del_init(&wk->entry);
                if (!list_empty(&rdev->wiphy_work_list))
                        queue_work(system_dfl_wq, work);
                spin_unlock_irq(&rdev->wiphy_work_lock);

                trace_wiphy_work_run(&rdev->wiphy, wk);
                wk->func(&rdev->wiphy, wk);
        } else {
                spin_unlock_irq(&rdev->wiphy_work_lock);
        }
}

/* exported functions */

struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
                           const char *requested_name)
{
        static atomic_t wiphy_counter = ATOMIC_INIT(0);

        struct cfg80211_registered_device *rdev;
        int alloc_size;

        WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key));
        WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc));
        WARN_ON(ops->connect && !ops->disconnect);
        WARN_ON(ops->join_ibss && !ops->leave_ibss);
        WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf);
        WARN_ON(ops->add_station && !ops->del_station);
        WARN_ON(ops->add_mpath && !ops->del_mpath);
        WARN_ON(ops->join_mesh && !ops->leave_mesh);
        WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device);
        WARN_ON(ops->start_ap && !ops->stop_ap);
        WARN_ON(ops->join_ocb && !ops->leave_ocb);
        WARN_ON(ops->suspend && !ops->resume);
        WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop);
        WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel);
        WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch);
        WARN_ON(ops->add_tx_ts && !ops->del_tx_ts);

        alloc_size = sizeof(*rdev) + sizeof_priv;

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

        rdev->ops = ops;

        rdev->wiphy_idx = atomic_inc_return(&wiphy_counter);

        if (unlikely(rdev->wiphy_idx < 0)) {
                /* ugh, wrapped! */
                atomic_dec(&wiphy_counter);
                kfree(rdev);
                return NULL;
        }

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

        /* give it a proper name */
        if (requested_name && requested_name[0]) {
                int rv;

                rtnl_lock();
                rv = cfg80211_dev_check_name(rdev, requested_name);

                if (rv < 0) {
                        rtnl_unlock();
                        goto use_default_name;
                }

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

use_default_name:
                /* NOTE:  This is *probably* safe w/out holding rtnl because of
                 * the restrictions on phy names.  Probably this call could
                 * fail if some other part of the kernel (re)named a device
                 * phyX.  But, might should add some locking and check return
                 * value, and use a different name if this one exists?
                 */
                rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
                if (rv < 0) {
                        kfree(rdev);
                        return NULL;
                }
        }

        mutex_init(&rdev->wiphy.mtx);
        INIT_LIST_HEAD(&rdev->wiphy.wdev_list);
        INIT_LIST_HEAD(&rdev->beacon_registrations);
        spin_lock_init(&rdev->beacon_registrations_lock);
        spin_lock_init(&rdev->bss_lock);
        INIT_LIST_HEAD(&rdev->bss_list);
        INIT_LIST_HEAD(&rdev->sched_scan_req_list);
        wiphy_work_init(&rdev->scan_done_wk, __cfg80211_scan_done);
        INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk,
                          cfg80211_dfs_channels_update_work);
#ifdef CONFIG_CFG80211_WEXT
        rdev->wiphy.wext = &cfg80211_wext_handler;
#endif

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

        INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk);
        wiphy_work_init(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk);
        INIT_WORK(&rdev->sched_scan_res_wk, cfg80211_sched_scan_results_wk);
        INIT_WORK(&rdev->propagate_radar_detect_wk,
                  cfg80211_propagate_radar_detect_wk);
        INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk);
        INIT_WORK(&rdev->mgmt_registrations_update_wk,
                  cfg80211_mgmt_registrations_update_wk);
        spin_lock_init(&rdev->mgmt_registrations_lock);
        INIT_WORK(&rdev->wiphy_work, cfg80211_wiphy_work);
        INIT_LIST_HEAD(&rdev->wiphy_work_list);
        spin_lock_init(&rdev->wiphy_work_lock);

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

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

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

        if (!rdev->wiphy.rfkill) {
                wiphy_free(&rdev->wiphy);
                return NULL;
        }

        INIT_WORK(&rdev->rfkill_block, cfg80211_rfkill_block_work);
        INIT_WORK(&rdev->conn_work, cfg80211_conn_work);
        INIT_WORK(&rdev->event_work, cfg80211_event_work);
        INIT_WORK(&rdev->background_cac_abort_wk,
                  cfg80211_background_cac_abort_wk);
        INIT_DELAYED_WORK(&rdev->background_cac_done_wk,
                          cfg80211_background_cac_done_wk);

        init_waitqueue_head(&rdev->dev_wait);

        /*
         * Initialize wiphy parameters to IEEE 802.11 MIB default values.
         * Fragmentation and RTS threshold are disabled by default with the
         * special -1 value.
         */
        rdev->wiphy.retry_short = 7;
        rdev->wiphy.retry_long = 4;
        rdev->wiphy.frag_threshold = (u32) -1;
        rdev->wiphy.rts_threshold = (u32) -1;
        rdev->wiphy.coverage_class = 0;

        rdev->wiphy.max_num_csa_counters = 1;

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

        return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new_nm);

static
int wiphy_verify_iface_combinations(struct wiphy *wiphy,
                                    const struct ieee80211_iface_combination *iface_comb,
                                    int n_iface_comb,
                                    bool combined_radio)
{
        const struct ieee80211_iface_combination *c;
        int i, j;

        for (i = 0; i < n_iface_comb; i++) {
                u32 cnt = 0;
                u16 all_iftypes = 0;

                c = &iface_comb[i];

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

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

                /* DFS only works on one channel. Avoid this check
                 * for multi-radio global combination, since it hold
                 * the capabilities of all radio combinations.
                 */
                if (!combined_radio &&
                    WARN_ON(c->radar_detect_widths &&
                            c->num_different_channels > 1))
                        return -EINVAL;

                if (WARN_ON(!c->n_limits))
                        return -EINVAL;

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

                        /* interface types shouldn't overlap */
                        if (WARN_ON(types & all_iftypes))
                                return -EINVAL;
                        all_iftypes |= types;

                        if (WARN_ON(!c->limits[j].max))
                                return -EINVAL;

                        /* Shouldn't list software iftypes in combinations! */
                        if (WARN_ON(wiphy->software_iftypes & types))
                                return -EINVAL;

                        /* Only a single P2P_DEVICE can be allowed, avoid this
                         * check for multi-radio global combination, since it
                         * hold the capabilities of all radio combinations.
                         */
                        if (!combined_radio &&
                            WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) &&
                                    c->limits[j].max > 1))
                                return -EINVAL;

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

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

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

                if (WARN_ON(all_iftypes & BIT(NL80211_IFTYPE_WDS)))
                        return -EINVAL;

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

        return 0;
}

static int wiphy_verify_combinations(struct wiphy *wiphy)
{
        int i, ret;
        bool combined_radio = false;

        if (wiphy->n_radio) {
                for (i = 0; i < wiphy->n_radio; i++) {
                        const struct wiphy_radio *radio = &wiphy->radio[i];

                        ret = wiphy_verify_iface_combinations(wiphy,
                                                              radio->iface_combinations,
                                                              radio->n_iface_combinations,
                                                              false);
                        if (ret)
                                return ret;
                }

                combined_radio = true;
        }

        ret = wiphy_verify_iface_combinations(wiphy,
                                              wiphy->iface_combinations,
                                              wiphy->n_iface_combinations,
                                              combined_radio);

        return ret;
}

int wiphy_register(struct wiphy *wiphy)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        int res;
        enum nl80211_band band;
        struct ieee80211_supported_band *sband;
        bool have_band = false;
        int i;
        u16 ifmodes = wiphy->interface_modes;

#ifdef CONFIG_PM
        if (WARN_ON(wiphy->wowlan &&
                    (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) &&
                    !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)))
                return -EINVAL;
        if (WARN_ON(wiphy->wowlan &&
                    !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns &&
                    !wiphy->wowlan->tcp))
                return -EINVAL;
#endif
        if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) &&
                    (!rdev->ops->tdls_channel_switch ||
                     !rdev->ops->tdls_cancel_channel_switch)))
                return -EINVAL;

        if (WARN_ON((wiphy->interface_modes & BIT(NL80211_IFTYPE_NAN)) &&
                    (!rdev->ops->start_nan || !rdev->ops->stop_nan ||
                     !rdev->ops->add_nan_func || !rdev->ops->del_nan_func ||
                     !(wiphy->nan_supported_bands & BIT(NL80211_BAND_2GHZ)))))
                return -EINVAL;

        if (WARN_ON(wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS)))
                return -EINVAL;

        if (WARN_ON(wiphy->pmsr_capa && !wiphy->pmsr_capa->ftm.supported))
                return -EINVAL;

        if (wiphy->pmsr_capa && wiphy->pmsr_capa->ftm.supported) {
                if (WARN_ON(!wiphy->pmsr_capa->ftm.asap &&
                            !wiphy->pmsr_capa->ftm.non_asap))
                        return -EINVAL;
                if (WARN_ON(!wiphy->pmsr_capa->ftm.preambles ||
                            !wiphy->pmsr_capa->ftm.bandwidths))
                        return -EINVAL;
                if (WARN_ON(wiphy->pmsr_capa->ftm.preambles &
                                ~(BIT(NL80211_PREAMBLE_LEGACY) |
                                  BIT(NL80211_PREAMBLE_HT) |
                                  BIT(NL80211_PREAMBLE_VHT) |
                                  BIT(NL80211_PREAMBLE_HE) |
                                  BIT(NL80211_PREAMBLE_DMG))))
                        return -EINVAL;
                if (WARN_ON((wiphy->pmsr_capa->ftm.trigger_based ||
                             wiphy->pmsr_capa->ftm.non_trigger_based) &&
                            !(wiphy->pmsr_capa->ftm.preambles &
                              BIT(NL80211_PREAMBLE_HE))))
                        return -EINVAL;
                if (WARN_ON(wiphy->pmsr_capa->ftm.bandwidths &
                                ~(BIT(NL80211_CHAN_WIDTH_20_NOHT) |
                                  BIT(NL80211_CHAN_WIDTH_20) |
                                  BIT(NL80211_CHAN_WIDTH_40) |
                                  BIT(NL80211_CHAN_WIDTH_80) |
                                  BIT(NL80211_CHAN_WIDTH_80P80) |
                                  BIT(NL80211_CHAN_WIDTH_160) |
                                  BIT(NL80211_CHAN_WIDTH_320) |
                                  BIT(NL80211_CHAN_WIDTH_5) |
                                  BIT(NL80211_CHAN_WIDTH_10))))
                        return -EINVAL;
        }

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

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

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

        if (WARN_ON(wiphy->addresses && !wiphy->n_addresses))
                return -EINVAL;

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

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

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

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

        if (WARN_ON(!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM) &&
                    rdev->ops->update_connect_params))
                return -EINVAL;

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

        /* sanity check ifmodes */
        WARN_ON(!ifmodes);
        ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1;
        if (WARN_ON(ifmodes != wiphy->interface_modes))
                wiphy->interface_modes = ifmodes;

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

        /* sanity check supported bands/channels */
        for (band = 0; band < NUM_NL80211_BANDS; band++) {
                const struct ieee80211_sband_iftype_data *iftd;
                u16 types = 0;
                bool have_he = false;

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

                sband->band = band;
                if (WARN_ON(!sband->n_channels))
                        return -EINVAL;
                /*
                 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
                 * n_bitrates is 0
                 */
                if (WARN_ON((band != NL80211_BAND_60GHZ &&
                             band != NL80211_BAND_S1GHZ) &&
                            !sband->n_bitrates))
                        return -EINVAL;

                if (WARN_ON(band == NL80211_BAND_6GHZ &&
                            (sband->ht_cap.ht_supported ||
                             sband->vht_cap.vht_supported)))
                        return -EINVAL;

                /*
                 * Since cfg80211_disable_40mhz_24ghz is global, we can
                 * modify the sband's ht data even if the driver uses a
                 * global structure for that.
                 */
                if (cfg80211_disable_40mhz_24ghz &&
                    band == NL80211_BAND_2GHZ &&
                    sband->ht_cap.ht_supported) {
                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
                        sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40;
                }

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

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

                        if (WARN_ON(sband->channels[i].freq_offset >= 1000))
                                return -EINVAL;
                }

                for_each_sband_iftype_data(sband, i, iftd) {
                        bool has_ap, has_non_ap;
                        u32 ap_bits = BIT(NL80211_IFTYPE_AP) |
                                      BIT(NL80211_IFTYPE_P2P_GO);

                        if (WARN_ON(!iftd->types_mask))
                                return -EINVAL;
                        if (WARN_ON(types & iftd->types_mask))
                                return -EINVAL;

                        /* at least one piece of information must be present */
                        if (WARN_ON(!iftd->he_cap.has_he))
                                return -EINVAL;

                        types |= iftd->types_mask;

                        if (i == 0)
                                have_he = iftd->he_cap.has_he;
                        else
                                have_he = have_he &&
                                          iftd->he_cap.has_he;

                        has_ap = iftd->types_mask & ap_bits;
                        has_non_ap = iftd->types_mask & ~ap_bits;

                        /*
                         * For EHT 20 MHz STA, the capabilities format differs
                         * but to simplify, don't check 20 MHz but rather check
                         * only if AP and non-AP were mentioned at the same time,
                         * reject if so.
                         */
                        if (WARN_ON(iftd->eht_cap.has_eht &&
                                    has_ap && has_non_ap))
                                return -EINVAL;
                }

                if (WARN_ON(!have_he && band == NL80211_BAND_6GHZ))
                        return -EINVAL;

                have_band = true;
        }

        if (!have_band) {
                WARN_ON(1);
                return -EINVAL;
        }

        for (i = 0; i < rdev->wiphy.n_vendor_commands; i++) {
                /*
                 * Validate we have a policy (can be explicitly set to
                 * VENDOR_CMD_RAW_DATA which is non-NULL) and also that
                 * we have at least one of doit/dumpit.
                 */
                if (WARN_ON(!rdev->wiphy.vendor_commands[i].policy))
                        return -EINVAL;
                if (WARN_ON(!rdev->wiphy.vendor_commands[i].doit &&
                            !rdev->wiphy.vendor_commands[i].dumpit))
                        return -EINVAL;
        }

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

        if (!wiphy->max_num_akm_suites)
                wiphy->max_num_akm_suites = NL80211_MAX_NR_AKM_SUITES;
        else if (wiphy->max_num_akm_suites < NL80211_MAX_NR_AKM_SUITES ||
                 wiphy->max_num_akm_suites > CFG80211_MAX_NUM_AKM_SUITES)
                return -EINVAL;

        /* Allocate radio configuration space for multi-radio wiphy */
        if (wiphy->n_radio > 0) {
                int idx;

                wiphy->radio_cfg = kzalloc_objs(*wiphy->radio_cfg,
                                                wiphy->n_radio);
                if (!wiphy->radio_cfg)
                        return -ENOMEM;
                /*
                 * Initialize wiphy radio parameters to IEEE 802.11
                 * MIB default values. RTS threshold is disabled by
                 * default with the special -1 value.
                 */
                for (idx = 0; idx < wiphy->n_radio; idx++)
                        wiphy->radio_cfg[idx].rts_threshold = (u32)-1;
        }

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

        rdev->wiphy.features |= NL80211_FEATURE_SCAN_FLUSH;

        if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_CTWINDOW)
                rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_CTWIN;
        else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_CTWIN)
                rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_CTWINDOW;
        if (rdev->wiphy.bss_param_support & WIPHY_BSS_PARAM_P2P_OPPPS)
                rdev->wiphy.features |= NL80211_FEATURE_P2P_GO_OPPPS;
        else if (rdev->wiphy.features & NL80211_FEATURE_P2P_GO_OPPPS)
                rdev->wiphy.bss_param_support |= WIPHY_BSS_PARAM_P2P_OPPPS;

        rtnl_lock();
        wiphy_lock(&rdev->wiphy);
        res = device_add(&rdev->wiphy.dev);
        if (res) {
                wiphy_unlock(&rdev->wiphy);
                rtnl_unlock();
                return res;
        }

        list_add_rcu(&rdev->list, &cfg80211_rdev_list);
        cfg80211_rdev_list_generation++;

        /* add to debugfs */
        rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
                                                    ieee80211_debugfs_dir);
        if (wiphy->n_radio > 0) {
                int idx;
                char radio_name[RADIO_DEBUGFSDIR_MAX_LEN];

                for (idx = 0; idx < wiphy->n_radio; idx++) {
                        scnprintf(radio_name, sizeof(radio_name), "radio%d",
                                  idx);
                        wiphy->radio_cfg[idx].radio_debugfsdir =
                                debugfs_create_dir(radio_name,
                                                   rdev->wiphy.debugfsdir);
                }
        }

        cfg80211_debugfs_rdev_add(rdev);
        nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
        wiphy_unlock(&rdev->wiphy);

        /* set up regulatory info */
        wiphy_regulatory_register(wiphy);

        if (wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
                struct regulatory_request request = {
                        .wiphy_idx = get_wiphy_idx(wiphy),
                        .initiator = NL80211_REGDOM_SET_BY_DRIVER,
                        .alpha2[0] = '9',
                        .alpha2[1] = '9',
                };

                nl80211_send_reg_change_event(&request);
        }

        /* Check that nobody globally advertises any capabilities they do not
         * advertise on all possible interface types.
         */
        if (wiphy->extended_capabilities_len &&
            wiphy->num_iftype_ext_capab &&
            wiphy->iftype_ext_capab) {
                u8 supported_on_all, j;
                const struct wiphy_iftype_ext_capab *capab;

                capab = wiphy->iftype_ext_capab;
                for (j = 0; j < wiphy->extended_capabilities_len; j++) {
                        if (capab[0].extended_capabilities_len > j)
                                supported_on_all =
                                        capab[0].extended_capabilities[j];
                        else
                                supported_on_all = 0x00;
                        for (i = 1; i < wiphy->num_iftype_ext_capab; i++) {
                                if (j >= capab[i].extended_capabilities_len) {
                                        supported_on_all = 0x00;
                                        break;
                                }
                                supported_on_all &=
                                        capab[i].extended_capabilities[j];
                        }
                        if (WARN_ON(wiphy->extended_capabilities[j] &
                                    ~supported_on_all))
                                break;
                }
        }

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

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

        return 0;
}
EXPORT_SYMBOL(wiphy_register);

void wiphy_rfkill_start_polling(struct wiphy *wiphy)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        if (!rdev->ops->rfkill_poll)
                return;
        rdev->rfkill_ops.poll = cfg80211_rfkill_poll;
        rfkill_resume_polling(wiphy->rfkill);
}
EXPORT_SYMBOL(wiphy_rfkill_start_polling);

void cfg80211_process_wiphy_works(struct cfg80211_registered_device *rdev,
                                  struct wiphy_work *end)
{
        unsigned int runaway_limit = 100;
        unsigned long flags;

        lockdep_assert_held(&rdev->wiphy.mtx);

        spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
        while (!list_empty(&rdev->wiphy_work_list)) {
                struct wiphy_work *wk;

                wk = list_first_entry(&rdev->wiphy_work_list,
                                      struct wiphy_work, entry);
                list_del_init(&wk->entry);
                spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);

                trace_wiphy_work_run(&rdev->wiphy, wk);
                wk->func(&rdev->wiphy, wk);

                spin_lock_irqsave(&rdev->wiphy_work_lock, flags);

                if (wk == end)
                        break;

                if (WARN_ON(--runaway_limit == 0))
                        INIT_LIST_HEAD(&rdev->wiphy_work_list);
        }
        spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
}

void wiphy_unregister(struct wiphy *wiphy)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        wait_event(rdev->dev_wait, ({
                int __count;
                wiphy_lock(&rdev->wiphy);
                __count = rdev->opencount;
                wiphy_unlock(&rdev->wiphy);
                __count == 0; }));

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

        rtnl_lock();
        wiphy_lock(&rdev->wiphy);
        nl80211_notify_wiphy(rdev, NL80211_CMD_DEL_WIPHY);
        rdev->wiphy.registered = false;

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

        /*
         * First remove the hardware from everywhere, this makes
         * it impossible to find from userspace.
         */
        debugfs_remove_recursive(rdev->wiphy.debugfsdir);
        list_del_rcu(&rdev->list);
        synchronize_rcu();

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

        cfg80211_rdev_list_generation++;
        device_del(&rdev->wiphy.dev);

#ifdef CONFIG_PM
        if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup)
                rdev_set_wakeup(rdev, false);
#endif

        /* surely nothing is reachable now, clean up work */
        cfg80211_process_wiphy_works(rdev, NULL);
        wiphy_unlock(&rdev->wiphy);
        rtnl_unlock();

        /* this has nothing to do now but make sure it's gone */
        cancel_work_sync(&rdev->wiphy_work);

        cancel_work_sync(&rdev->rfkill_block);
        cancel_work_sync(&rdev->conn_work);
        flush_work(&rdev->event_work);
        cancel_delayed_work_sync(&rdev->dfs_update_channels_wk);
        cancel_delayed_work_sync(&rdev->background_cac_done_wk);
        flush_work(&rdev->destroy_work);
        flush_work(&rdev->propagate_radar_detect_wk);
        flush_work(&rdev->propagate_cac_done_wk);
        flush_work(&rdev->mgmt_registrations_update_wk);
        flush_work(&rdev->background_cac_abort_wk);

        cfg80211_rdev_free_wowlan(rdev);
        cfg80211_free_coalesce(rdev->coalesce);
        rdev->coalesce = NULL;
}
EXPORT_SYMBOL(wiphy_unregister);

void cfg80211_dev_free(struct cfg80211_registered_device *rdev)
{
        struct cfg80211_internal_bss *scan, *tmp;
        struct cfg80211_beacon_registration *reg, *treg;
        unsigned long flags;

        spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
        WARN_ON(!list_empty(&rdev->wiphy_work_list));
        spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
        cancel_work_sync(&rdev->wiphy_work);

        rfkill_destroy(rdev->wiphy.rfkill);
        list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) {
                list_del(&reg->list);
                kfree(reg);
        }
        list_for_each_entry_safe(scan, tmp, &rdev->bss_list, list)
                cfg80211_put_bss(&rdev->wiphy, &scan->pub);
        mutex_destroy(&rdev->wiphy.mtx);

        /*
         * The 'regd' can only be non-NULL if we never finished
         * initializing the wiphy and thus never went through the
         * unregister path - e.g. in failure scenarios. Thus, it
         * cannot have been visible to anyone if non-NULL, so we
         * can just free it here.
         */
        kfree(rcu_dereference_raw(rdev->wiphy.regd));

        kfree(rdev);
}

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

void wiphy_rfkill_set_hw_state_reason(struct wiphy *wiphy, bool blocked,
                                      enum rfkill_hard_block_reasons reason)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);

        if (rfkill_set_hw_state_reason(wiphy->rfkill, blocked, reason))
                schedule_work(&rdev->rfkill_block);
}
EXPORT_SYMBOL(wiphy_rfkill_set_hw_state_reason);

static void _cfg80211_unregister_wdev(struct wireless_dev *wdev,
                                      bool unregister_netdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_cqm_config *cqm_config;
        unsigned int link_id;

        ASSERT_RTNL();
        lockdep_assert_held(&rdev->wiphy.mtx);

        nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);

        wdev->registered = false;

        if (wdev->netdev) {
                sysfs_remove_link(&wdev->netdev->dev.kobj, "phy80211");
                if (unregister_netdev)
                        unregister_netdevice(wdev->netdev);
        }

        list_del_rcu(&wdev->list);
        synchronize_net();
        rdev->devlist_generation++;

        cfg80211_mlme_purge_registrations(wdev);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_P2P_DEVICE:
                cfg80211_stop_p2p_device(rdev, wdev);
                break;
        case NL80211_IFTYPE_NAN:
                cfg80211_stop_nan(rdev, wdev);
                break;
        default:
                break;
        }

#ifdef CONFIG_CFG80211_WEXT
        kfree_sensitive(wdev->wext.keys);
        wdev->wext.keys = NULL;
#endif
        wiphy_work_cancel(wdev->wiphy, &wdev->cqm_rssi_work);
        /* deleted from the list, so can't be found from nl80211 any more */
        cqm_config = rcu_access_pointer(wdev->cqm_config);
        kfree_rcu(cqm_config, rcu_head);
        RCU_INIT_POINTER(wdev->cqm_config, NULL);

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

        if (wdev->iftype == NL80211_IFTYPE_STATION ||
            wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) {
                for (link_id = 0; link_id < ARRAY_SIZE(wdev->links); link_id++) {
                        struct cfg80211_internal_bss *curbss;

                        curbss = wdev->links[link_id].client.current_bss;

                        if (WARN_ON(curbss)) {
                                cfg80211_unhold_bss(curbss);
                                cfg80211_put_bss(wdev->wiphy, &curbss->pub);
                                wdev->links[link_id].client.current_bss = NULL;
                        }
                }
        }

        wdev->connected = false;
}

void cfg80211_unregister_wdev(struct wireless_dev *wdev)
{
        _cfg80211_unregister_wdev(wdev, true);
}
EXPORT_SYMBOL(cfg80211_unregister_wdev);

static const struct device_type wiphy_type = {
        .name   = "wlan",
};

void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
                               enum nl80211_iftype iftype, int num)
{
        lockdep_assert_held(&rdev->wiphy.mtx);

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

void cfg80211_leave(struct cfg80211_registered_device *rdev,
                    struct wireless_dev *wdev,
                    int link_id)
{
        struct net_device *dev = wdev->netdev;
        struct cfg80211_sched_scan_request *pos, *tmp;

        lockdep_assert_held(&rdev->wiphy.mtx);

        cfg80211_pmsr_wdev_down(wdev);

        cfg80211_stop_radar_detection(wdev);
        cfg80211_stop_background_radar_detection(wdev);

        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
                cfg80211_leave_ibss(rdev, dev, true);
                break;
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_STATION:
                list_for_each_entry_safe(pos, tmp, &rdev->sched_scan_req_list,
                                         list) {
                        if (dev == pos->dev)
                                cfg80211_stop_sched_scan_req(rdev, pos, false);
                }

#ifdef CONFIG_CFG80211_WEXT
                kfree(wdev->wext.ie);
                wdev->wext.ie = NULL;
                wdev->wext.ie_len = 0;
                wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif
                cfg80211_disconnect(rdev, dev,
                                    WLAN_REASON_DEAUTH_LEAVING, true);
                break;
        case NL80211_IFTYPE_MESH_POINT:
                cfg80211_leave_mesh(rdev, dev);
                break;
        case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_P2P_GO:
                cfg80211_stop_ap(rdev, dev, link_id, true);
                break;
        case NL80211_IFTYPE_OCB:
                cfg80211_leave_ocb(rdev, dev);
                break;
        case NL80211_IFTYPE_P2P_DEVICE:
                cfg80211_stop_p2p_device(rdev, wdev);
                break;
        case NL80211_IFTYPE_NAN:
                cfg80211_stop_nan(rdev, wdev);
                break;
        case NL80211_IFTYPE_AP_VLAN:
        case NL80211_IFTYPE_MONITOR:
                /* nothing to do */
                break;
        case NL80211_IFTYPE_UNSPECIFIED:
        case NL80211_IFTYPE_WDS:
        case NUM_NL80211_IFTYPES:
                /* invalid */
                break;
        }
}

void cfg80211_stop_link(struct wiphy *wiphy, struct wireless_dev *wdev,
                        int link_id, gfp_t gfp)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        struct cfg80211_event *ev;
        unsigned long flags;

        /* Only AP/GO interfaces may have a specific link_id */
        if (WARN_ON_ONCE(link_id != -1 &&
                         wdev->iftype != NL80211_IFTYPE_AP &&
                         wdev->iftype != NL80211_IFTYPE_P2P_GO))
                link_id = -1;

        trace_cfg80211_stop_link(wiphy, wdev, link_id);

        ev = kzalloc_obj(*ev, gfp);
        if (!ev)
                return;

        ev->type = EVENT_STOPPED;
        ev->link_id = link_id;

        spin_lock_irqsave(&wdev->event_lock, flags);
        list_add_tail(&ev->list, &wdev->event_list);
        spin_unlock_irqrestore(&wdev->event_lock, flags);
        queue_work(cfg80211_wq, &rdev->event_work);
}
EXPORT_SYMBOL(cfg80211_stop_link);

void cfg80211_init_wdev(struct wireless_dev *wdev)
{
        INIT_LIST_HEAD(&wdev->event_list);
        spin_lock_init(&wdev->event_lock);
        INIT_LIST_HEAD(&wdev->mgmt_registrations);
        INIT_LIST_HEAD(&wdev->pmsr_list);
        spin_lock_init(&wdev->pmsr_lock);
        INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk);

#ifdef CONFIG_CFG80211_WEXT
        wdev->wext.default_key = -1;
        wdev->wext.default_mgmt_key = -1;
        wdev->wext.connect.auth_type = NL80211_AUTHTYPE_AUTOMATIC;
#endif

        wiphy_work_init(&wdev->cqm_rssi_work, cfg80211_cqm_rssi_notify_work);

        if (wdev->wiphy->flags & WIPHY_FLAG_PS_ON_BY_DEFAULT)
                wdev->ps = true;
        else
                wdev->ps = false;
        /* allow mac80211 to determine the timeout */
        wdev->ps_timeout = -1;

        wdev->radio_mask = BIT(wdev->wiphy->n_radio) - 1;

        if ((wdev->iftype == NL80211_IFTYPE_STATION ||
             wdev->iftype == NL80211_IFTYPE_P2P_CLIENT ||
             wdev->iftype == NL80211_IFTYPE_ADHOC) && !wdev->use_4addr)
                wdev->netdev->priv_flags |= IFF_DONT_BRIDGE;

        INIT_WORK(&wdev->disconnect_wk, cfg80211_autodisconnect_wk);
}

void cfg80211_register_wdev(struct cfg80211_registered_device *rdev,
                            struct wireless_dev *wdev)
{
        ASSERT_RTNL();
        lockdep_assert_held(&rdev->wiphy.mtx);

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

        if (wdev->netdev &&
            sysfs_create_link(&wdev->netdev->dev.kobj, &rdev->wiphy.dev.kobj,
                              "phy80211"))
                pr_err("failed to add phy80211 symlink to netdev!\n");

        nl80211_notify_iface(rdev, wdev, NL80211_CMD_NEW_INTERFACE);
}

int cfg80211_register_netdevice(struct net_device *dev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev;
        int ret;

        ASSERT_RTNL();

        if (WARN_ON(!wdev))
                return -EINVAL;

        rdev = wiphy_to_rdev(wdev->wiphy);

        lockdep_assert_held(&rdev->wiphy.mtx);

        /* we'll take care of this */
        wdev->registered = true;
        wdev->registering = true;
        ret = register_netdevice(dev);
        if (ret)
                goto out;

        cfg80211_register_wdev(rdev, wdev);
        ret = 0;
out:
        wdev->registering = false;
        if (ret)
                wdev->registered = false;
        return ret;
}
EXPORT_SYMBOL(cfg80211_register_netdevice);

static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
                                         unsigned long state, void *ptr)
{
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev;
        struct cfg80211_sched_scan_request *pos, *tmp;

        if (!wdev)
                return NOTIFY_DONE;

        rdev = wiphy_to_rdev(wdev->wiphy);

        WARN_ON(wdev->iftype == NL80211_IFTYPE_UNSPECIFIED);

        switch (state) {
        case NETDEV_POST_INIT:
                SET_NETDEV_DEVTYPE(dev, &wiphy_type);
                wdev->netdev = dev;
                /* can only change netns with wiphy */
                dev->netns_immutable = true;

                cfg80211_init_wdev(wdev);
                break;
        case NETDEV_REGISTER:
                if (!wdev->registered) {
                        guard(wiphy)(&rdev->wiphy);

                        cfg80211_register_wdev(rdev, wdev);
                }
                break;
        case NETDEV_UNREGISTER:
                /*
                 * It is possible to get NETDEV_UNREGISTER multiple times,
                 * so check wdev->registered.
                 */
                if (wdev->registered && !wdev->registering) {
                        guard(wiphy)(&rdev->wiphy);

                        _cfg80211_unregister_wdev(wdev, false);
                }
                break;
        case NETDEV_GOING_DOWN:
                scoped_guard(wiphy, &rdev->wiphy) {
                        cfg80211_leave(rdev, wdev, -1);
                        cfg80211_remove_links(wdev);
                }
                /* since we just did cfg80211_leave() nothing to do there */
                cancel_work_sync(&wdev->disconnect_wk);
                cancel_work_sync(&wdev->pmsr_free_wk);
                break;
        case NETDEV_DOWN:
                wiphy_lock(&rdev->wiphy);
                cfg80211_update_iface_num(rdev, wdev->iftype, -1);
                if (rdev->scan_req && rdev->scan_req->req.wdev == wdev) {
                        if (WARN_ON(!rdev->scan_req->notified &&
                                    (!rdev->int_scan_req ||
                                     !rdev->int_scan_req->notified)))
                                rdev->scan_req->info.aborted = true;
                        ___cfg80211_scan_done(rdev, false);
                }

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

                rdev->opencount--;
                wiphy_unlock(&rdev->wiphy);
                wake_up(&rdev->dev_wait);
                break;
        case NETDEV_UP:
                wiphy_lock(&rdev->wiphy);
                cfg80211_update_iface_num(rdev, wdev->iftype, 1);
                switch (wdev->iftype) {
#ifdef CONFIG_CFG80211_WEXT
                case NL80211_IFTYPE_ADHOC:
                        cfg80211_ibss_wext_join(rdev, wdev);
                        break;
                case NL80211_IFTYPE_STATION:
                        cfg80211_mgd_wext_connect(rdev, wdev);
                        break;
#endif
#ifdef CONFIG_MAC80211_MESH
                case NL80211_IFTYPE_MESH_POINT:
                        {
                                /* backward compat code... */
                                struct mesh_setup setup;
                                memcpy(&setup, &default_mesh_setup,
                                                sizeof(setup));
                                 /* back compat only needed for mesh_id */
                                setup.mesh_id = wdev->u.mesh.id;
                                setup.mesh_id_len = wdev->u.mesh.id_up_len;
                                if (wdev->u.mesh.id_up_len)
                                        __cfg80211_join_mesh(rdev, dev,
                                                        &setup,
                                                        &default_mesh_config);
                                break;
                        }
#endif
                default:
                        break;
                }
                rdev->opencount++;

                /*
                 * Configure power management to the driver here so that its
                 * correctly set also after interface type changes etc.
                 */
                if ((wdev->iftype == NL80211_IFTYPE_STATION ||
                     wdev->iftype == NL80211_IFTYPE_P2P_CLIENT) &&
                    rdev->ops->set_power_mgmt &&
                    rdev_set_power_mgmt(rdev, dev, wdev->ps,
                                        wdev->ps_timeout)) {
                        /* assume this means it's off */
                        wdev->ps = false;
                }
                wiphy_unlock(&rdev->wiphy);
                break;
        case NETDEV_PRE_UP:
                if (!cfg80211_iftype_allowed(wdev->wiphy, wdev->iftype,
                                             wdev->use_4addr, 0))
                        return notifier_from_errno(-EOPNOTSUPP);

                if (rfkill_blocked(rdev->wiphy.rfkill))
                        return notifier_from_errno(-ERFKILL);
                break;
        default:
                return NOTIFY_DONE;
        }

        wireless_nlevent_flush();

        return NOTIFY_OK;
}

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

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

        rtnl_lock();
        for_each_rdev(rdev) {
                if (net_eq(wiphy_net(&rdev->wiphy), net))
                        WARN_ON(cfg80211_switch_netns(rdev, &init_net));
        }
        rtnl_unlock();
}

static struct pernet_operations cfg80211_pernet_ops = {
        .exit = cfg80211_pernet_exit,
};

void wiphy_work_queue(struct wiphy *wiphy, struct wiphy_work *work)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        unsigned long flags;

        trace_wiphy_work_queue(wiphy, work);

        spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
        if (list_empty(&work->entry))
                list_add_tail(&work->entry, &rdev->wiphy_work_list);
        spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);

        queue_work(system_dfl_wq, &rdev->wiphy_work);
}
EXPORT_SYMBOL_GPL(wiphy_work_queue);

void wiphy_work_cancel(struct wiphy *wiphy, struct wiphy_work *work)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        unsigned long flags;

        lockdep_assert_held(&wiphy->mtx);

        trace_wiphy_work_cancel(wiphy, work);

        spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
        if (!list_empty(&work->entry))
                list_del_init(&work->entry);
        spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);
}
EXPORT_SYMBOL_GPL(wiphy_work_cancel);

void wiphy_work_flush(struct wiphy *wiphy, struct wiphy_work *work)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        unsigned long flags;
        bool run;

        trace_wiphy_work_flush(wiphy, work);

        spin_lock_irqsave(&rdev->wiphy_work_lock, flags);
        run = !work || !list_empty(&work->entry);
        spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags);

        if (run)
                cfg80211_process_wiphy_works(rdev, work);
}
EXPORT_SYMBOL_GPL(wiphy_work_flush);

void wiphy_delayed_work_timer(struct timer_list *t)
{
        struct wiphy_delayed_work *dwork = timer_container_of(dwork, t, timer);

        wiphy_work_queue(dwork->wiphy, &dwork->work);
}
EXPORT_SYMBOL(wiphy_delayed_work_timer);

void wiphy_delayed_work_queue(struct wiphy *wiphy,
                              struct wiphy_delayed_work *dwork,
                              unsigned long delay)
{
        trace_wiphy_delayed_work_queue(wiphy, &dwork->work, delay);

        if (!delay) {
                timer_delete(&dwork->timer);
                wiphy_work_queue(wiphy, &dwork->work);
                return;
        }

        dwork->wiphy = wiphy;
        mod_timer(&dwork->timer, jiffies + delay);
}
EXPORT_SYMBOL_GPL(wiphy_delayed_work_queue);

void wiphy_delayed_work_cancel(struct wiphy *wiphy,
                               struct wiphy_delayed_work *dwork)
{
        lockdep_assert_held(&wiphy->mtx);

        timer_delete_sync(&dwork->timer);
        wiphy_work_cancel(wiphy, &dwork->work);
}
EXPORT_SYMBOL_GPL(wiphy_delayed_work_cancel);

void wiphy_delayed_work_flush(struct wiphy *wiphy,
                              struct wiphy_delayed_work *dwork)
{
        lockdep_assert_held(&wiphy->mtx);

        timer_delete_sync(&dwork->timer);
        wiphy_work_flush(wiphy, &dwork->work);
}
EXPORT_SYMBOL_GPL(wiphy_delayed_work_flush);

bool wiphy_delayed_work_pending(struct wiphy *wiphy,
                                struct wiphy_delayed_work *dwork)
{
        return timer_pending(&dwork->timer);
}
EXPORT_SYMBOL_GPL(wiphy_delayed_work_pending);

enum hrtimer_restart wiphy_hrtimer_work_timer(struct hrtimer *t)
{
        struct wiphy_hrtimer_work *hrwork =
                container_of(t, struct wiphy_hrtimer_work, timer);

        wiphy_work_queue(hrwork->wiphy, &hrwork->work);

        return HRTIMER_NORESTART;
}
EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_timer);

void wiphy_hrtimer_work_queue(struct wiphy *wiphy,
                              struct wiphy_hrtimer_work *hrwork,
                              ktime_t delay)
{
        trace_wiphy_hrtimer_work_queue(wiphy, &hrwork->work, delay);

        if (!delay) {
                hrtimer_cancel(&hrwork->timer);
                wiphy_work_queue(wiphy, &hrwork->work);
                return;
        }

        hrwork->wiphy = wiphy;
        hrtimer_start_range_ns(&hrwork->timer, delay,
                               1000 * NSEC_PER_USEC, HRTIMER_MODE_REL);
}
EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_queue);

void wiphy_hrtimer_work_cancel(struct wiphy *wiphy,
                               struct wiphy_hrtimer_work *hrwork)
{
        lockdep_assert_held(&wiphy->mtx);

        hrtimer_cancel(&hrwork->timer);
        wiphy_work_cancel(wiphy, &hrwork->work);
}
EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_cancel);

void wiphy_hrtimer_work_flush(struct wiphy *wiphy,
                              struct wiphy_hrtimer_work *hrwork)
{
        lockdep_assert_held(&wiphy->mtx);

        hrtimer_cancel(&hrwork->timer);
        wiphy_work_flush(wiphy, &hrwork->work);
}
EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_flush);

bool wiphy_hrtimer_work_pending(struct wiphy *wiphy,
                                struct wiphy_hrtimer_work *hrwork)
{
        return hrtimer_is_queued(&hrwork->timer);
}
EXPORT_SYMBOL_GPL(wiphy_hrtimer_work_pending);

static int __init cfg80211_init(void)
{
        int err;

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

        err = wiphy_sysfs_init();
        if (err)
                goto out_fail_sysfs;

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

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

        ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);

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

        cfg80211_wq = alloc_ordered_workqueue("cfg80211", WQ_MEM_RECLAIM);
        if (!cfg80211_wq) {
                err = -ENOMEM;
                goto out_fail_wq;
        }

        return 0;

out_fail_wq:
        regulatory_exit();
out_fail_reg:
        debugfs_remove(ieee80211_debugfs_dir);
        nl80211_exit();
out_fail_nl80211:
        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
out_fail_notifier:
        wiphy_sysfs_exit();
out_fail_sysfs:
        unregister_pernet_device(&cfg80211_pernet_ops);
out_fail_pernet:
        return err;
}
fs_initcall(cfg80211_init);

static void __exit cfg80211_exit(void)
{
        debugfs_remove(ieee80211_debugfs_dir);
        nl80211_exit();
        unregister_netdevice_notifier(&cfg80211_netdev_notifier);
        wiphy_sysfs_exit();
        regulatory_exit();
        unregister_pernet_device(&cfg80211_pernet_ops);
        destroy_workqueue(cfg80211_wq);
}
module_exit(cfg80211_exit);