// SPDX-License-Identifier: GPL-2.0
/*
 * SME code for cfg80211
 * both driver SME event handling and the SME implementation
 * (for nl80211's connect() and wext)
 *
 * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
 * Copyright (C) 2009, 2020 Intel Corporation. All rights reserved.
 * Copyright 2017       Intel Deutschland GmbH
 */

#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/wireless.h>
#include <linux/export.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include "nl80211.h"
#include "reg.h"
#include "rdev-ops.h"

/*
 * Software SME in cfg80211, using auth/assoc/deauth calls to the
 * driver. This is for implementing nl80211's connect/disconnect
 * and wireless extensions (if configured.)
 */

struct cfg80211_conn {
        struct cfg80211_connect_params params;
        /* these are sub-states of the _CONNECTING sme_state */
        enum {
                CFG80211_CONN_SCANNING,
                CFG80211_CONN_SCAN_AGAIN,
                CFG80211_CONN_AUTHENTICATE_NEXT,
                CFG80211_CONN_AUTHENTICATING,
                CFG80211_CONN_AUTH_FAILED_TIMEOUT,
                CFG80211_CONN_ASSOCIATE_NEXT,
                CFG80211_CONN_ASSOCIATING,
                CFG80211_CONN_ASSOC_FAILED,
                CFG80211_CONN_ASSOC_FAILED_TIMEOUT,
                CFG80211_CONN_DEAUTH,
                CFG80211_CONN_ABANDON,
                CFG80211_CONN_CONNECTED,
        } state;
        u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
        const u8 *ie;
        size_t ie_len;
        bool auto_auth, prev_bssid_valid;
};

static void cfg80211_sme_free(struct wireless_dev *wdev)
{
        if (!wdev->conn)
                return;

        kfree(wdev->conn->ie);
        kfree(wdev->conn);
        wdev->conn = NULL;
}

static int cfg80211_conn_scan(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_scan_request *request;
        int n_channels, err;

        ASSERT_WDEV_LOCK(wdev);

        if (rdev->scan_req || rdev->scan_msg)
                return -EBUSY;

        if (wdev->conn->params.channel)
                n_channels = 1;
        else
                n_channels = ieee80211_get_num_supported_channels(wdev->wiphy);

        request = kzalloc(sizeof(*request) + sizeof(request->ssids[0]) +
                          sizeof(request->channels[0]) * n_channels,
                          GFP_KERNEL);
        if (!request)
                return -ENOMEM;

        if (wdev->conn->params.channel) {
                enum nl80211_band band = wdev->conn->params.channel->band;
                struct ieee80211_supported_band *sband =
                        wdev->wiphy->bands[band];

                if (!sband) {
                        kfree(request);
                        return -EINVAL;
                }
                request->channels[0] = wdev->conn->params.channel;
                request->rates[band] = (1 << sband->n_bitrates) - 1;
        } else {
                int i = 0, j;
                enum nl80211_band band;
                struct ieee80211_supported_band *bands;
                struct ieee80211_channel *channel;

                for (band = 0; band < NUM_NL80211_BANDS; band++) {
                        bands = wdev->wiphy->bands[band];
                        if (!bands)
                                continue;
                        for (j = 0; j < bands->n_channels; j++) {
                                channel = &bands->channels[j];
                                if (channel->flags & IEEE80211_CHAN_DISABLED)
                                        continue;
                                request->channels[i++] = channel;
                        }
                        request->rates[band] = (1 << bands->n_bitrates) - 1;
                }
                n_channels = i;
        }
        request->n_channels = n_channels;
        request->ssids = (void *)&request->channels[n_channels];
        request->n_ssids = 1;

        memcpy(request->ssids[0].ssid, wdev->conn->params.ssid,
                wdev->conn->params.ssid_len);
        request->ssids[0].ssid_len = wdev->conn->params.ssid_len;

        eth_broadcast_addr(request->bssid);

        request->wdev = wdev;
        request->wiphy = &rdev->wiphy;
        request->scan_start = jiffies;

        rdev->scan_req = request;

        err = rdev_scan(rdev, request);
        if (!err) {
                wdev->conn->state = CFG80211_CONN_SCANNING;
                nl80211_send_scan_start(rdev, wdev);
                dev_hold(wdev->netdev);
        } else {
                rdev->scan_req = NULL;
                kfree(request);
        }
        return err;
}

static int cfg80211_conn_do_work(struct wireless_dev *wdev,
                                 enum nl80211_timeout_reason *treason)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_connect_params *params;
        struct cfg80211_assoc_request req = {};
        int err;

        ASSERT_WDEV_LOCK(wdev);

        if (!wdev->conn)
                return 0;

        params = &wdev->conn->params;

        switch (wdev->conn->state) {
        case CFG80211_CONN_SCANNING:
                /* didn't find it during scan ... */
                return -ENOENT;
        case CFG80211_CONN_SCAN_AGAIN:
                return cfg80211_conn_scan(wdev);
        case CFG80211_CONN_AUTHENTICATE_NEXT:
                if (WARN_ON(!rdev->ops->auth))
                        return -EOPNOTSUPP;
                wdev->conn->state = CFG80211_CONN_AUTHENTICATING;
                return cfg80211_mlme_auth(rdev, wdev->netdev,
                                          params->channel, params->auth_type,
                                          params->bssid,
                                          params->ssid, params->ssid_len,
                                          NULL, 0,
                                          params->key, params->key_len,
                                          params->key_idx, NULL, 0);
        case CFG80211_CONN_AUTH_FAILED_TIMEOUT:
                *treason = NL80211_TIMEOUT_AUTH;
                return -ENOTCONN;
        case CFG80211_CONN_ASSOCIATE_NEXT:
                if (WARN_ON(!rdev->ops->assoc))
                        return -EOPNOTSUPP;
                wdev->conn->state = CFG80211_CONN_ASSOCIATING;
                if (wdev->conn->prev_bssid_valid)
                        req.prev_bssid = wdev->conn->prev_bssid;
                req.ie = params->ie;
                req.ie_len = params->ie_len;
                req.use_mfp = params->mfp != NL80211_MFP_NO;
                req.crypto = params->crypto;
                req.flags = params->flags;
                req.ht_capa = params->ht_capa;
                req.ht_capa_mask = params->ht_capa_mask;
                req.vht_capa = params->vht_capa;
                req.vht_capa_mask = params->vht_capa_mask;

                err = cfg80211_mlme_assoc(rdev, wdev->netdev, params->channel,
                                          params->bssid, params->ssid,
                                          params->ssid_len, &req);
                if (err)
                        cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
                                             NULL, 0,
                                             WLAN_REASON_DEAUTH_LEAVING,
                                             false);
                return err;
        case CFG80211_CONN_ASSOC_FAILED_TIMEOUT:
                *treason = NL80211_TIMEOUT_ASSOC;
                fallthrough;
        case CFG80211_CONN_ASSOC_FAILED:
                cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
                                     NULL, 0,
                                     WLAN_REASON_DEAUTH_LEAVING, false);
                return -ENOTCONN;
        case CFG80211_CONN_DEAUTH:
                cfg80211_mlme_deauth(rdev, wdev->netdev, params->bssid,
                                     NULL, 0,
                                     WLAN_REASON_DEAUTH_LEAVING, false);
                fallthrough;
        case CFG80211_CONN_ABANDON:
                /* free directly, disconnected event already sent */
                cfg80211_sme_free(wdev);
                return 0;
        default:
                return 0;
        }
}

void cfg80211_conn_work(struct work_struct *work)
{
        struct cfg80211_registered_device *rdev =
                container_of(work, struct cfg80211_registered_device, conn_work);
        struct wireless_dev *wdev;
        u8 bssid_buf[ETH_ALEN], *bssid = NULL;
        enum nl80211_timeout_reason treason;

        wiphy_lock(&rdev->wiphy);

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

                wdev_lock(wdev);
                if (!netif_running(wdev->netdev)) {
                        wdev_unlock(wdev);
                        continue;
                }
                if (!wdev->conn ||
                    wdev->conn->state == CFG80211_CONN_CONNECTED) {
                        wdev_unlock(wdev);
                        continue;
                }
                if (wdev->conn->params.bssid) {
                        memcpy(bssid_buf, wdev->conn->params.bssid, ETH_ALEN);
                        bssid = bssid_buf;
                }
                treason = NL80211_TIMEOUT_UNSPECIFIED;
                if (cfg80211_conn_do_work(wdev, &treason)) {
                        struct cfg80211_connect_resp_params cr;

                        memset(&cr, 0, sizeof(cr));
                        cr.status = -1;
                        cr.bssid = bssid;
                        cr.timeout_reason = treason;
                        __cfg80211_connect_result(wdev->netdev, &cr, false);
                }
                wdev_unlock(wdev);
        }

        wiphy_unlock(&rdev->wiphy);
}

/* Returned bss is reference counted and must be cleaned up appropriately. */
static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_bss *bss;

        ASSERT_WDEV_LOCK(wdev);

        bss = cfg80211_get_bss(wdev->wiphy, wdev->conn->params.channel,
                               wdev->conn->params.bssid,
                               wdev->conn->params.ssid,
                               wdev->conn->params.ssid_len,
                               wdev->conn_bss_type,
                               IEEE80211_PRIVACY(wdev->conn->params.privacy));
        if (!bss)
                return NULL;

        memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
        wdev->conn->params.bssid = wdev->conn->bssid;
        wdev->conn->params.channel = bss->channel;
        wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
        schedule_work(&rdev->conn_work);

        return bss;
}

static void __cfg80211_sme_scan_done(struct net_device *dev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_bss *bss;

        ASSERT_WDEV_LOCK(wdev);

        if (!wdev->conn)
                return;

        if (wdev->conn->state != CFG80211_CONN_SCANNING &&
            wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
                return;

        bss = cfg80211_get_conn_bss(wdev);
        if (bss)
                cfg80211_put_bss(&rdev->wiphy, bss);
        else
                schedule_work(&rdev->conn_work);
}

void cfg80211_sme_scan_done(struct net_device *dev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;

        wdev_lock(wdev);
        __cfg80211_sme_scan_done(dev);
        wdev_unlock(wdev);
}

void cfg80211_sme_rx_auth(struct wireless_dev *wdev, const u8 *buf, size_t len)
{
        struct wiphy *wiphy = wdev->wiphy;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
        struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)buf;
        u16 status_code = le16_to_cpu(mgmt->u.auth.status_code);

        ASSERT_WDEV_LOCK(wdev);

        if (!wdev->conn || wdev->conn->state == CFG80211_CONN_CONNECTED)
                return;

        if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG &&
            wdev->conn->auto_auth &&
            wdev->conn->params.auth_type != NL80211_AUTHTYPE_NETWORK_EAP) {
                /* select automatically between only open, shared, leap */
                switch (wdev->conn->params.auth_type) {
                case NL80211_AUTHTYPE_OPEN_SYSTEM:
                        if (wdev->connect_keys)
                                wdev->conn->params.auth_type =
                                        NL80211_AUTHTYPE_SHARED_KEY;
                        else
                                wdev->conn->params.auth_type =
                                        NL80211_AUTHTYPE_NETWORK_EAP;
                        break;
                case NL80211_AUTHTYPE_SHARED_KEY:
                        wdev->conn->params.auth_type =
                                NL80211_AUTHTYPE_NETWORK_EAP;
                        break;
                default:
                        /* huh? */
                        wdev->conn->params.auth_type =
                                NL80211_AUTHTYPE_OPEN_SYSTEM;
                        break;
                }
                wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
                schedule_work(&rdev->conn_work);
        } else if (status_code != WLAN_STATUS_SUCCESS) {
                struct cfg80211_connect_resp_params cr;

                memset(&cr, 0, sizeof(cr));
                cr.status = status_code;
                cr.bssid = mgmt->bssid;
                cr.timeout_reason = NL80211_TIMEOUT_UNSPECIFIED;
                __cfg80211_connect_result(wdev->netdev, &cr, false);
        } else if (wdev->conn->state == CFG80211_CONN_AUTHENTICATING) {
                wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
                schedule_work(&rdev->conn_work);
        }
}

bool cfg80211_sme_rx_assoc_resp(struct wireless_dev *wdev, u16 status)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        if (!wdev->conn)
                return false;

        if (status == WLAN_STATUS_SUCCESS) {
                wdev->conn->state = CFG80211_CONN_CONNECTED;
                return false;
        }

        if (wdev->conn->prev_bssid_valid) {
                /*
                 * Some stupid APs don't accept reassoc, so we
                 * need to fall back to trying regular assoc;
                 * return true so no event is sent to userspace.
                 */
                wdev->conn->prev_bssid_valid = false;
                wdev->conn->state = CFG80211_CONN_ASSOCIATE_NEXT;
                schedule_work(&rdev->conn_work);
                return true;
        }

        wdev->conn->state = CFG80211_CONN_ASSOC_FAILED;
        schedule_work(&rdev->conn_work);
        return false;
}

void cfg80211_sme_deauth(struct wireless_dev *wdev)
{
        cfg80211_sme_free(wdev);
}

void cfg80211_sme_auth_timeout(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        if (!wdev->conn)
                return;

        wdev->conn->state = CFG80211_CONN_AUTH_FAILED_TIMEOUT;
        schedule_work(&rdev->conn_work);
}

void cfg80211_sme_disassoc(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        if (!wdev->conn)
                return;

        wdev->conn->state = CFG80211_CONN_DEAUTH;
        schedule_work(&rdev->conn_work);
}

void cfg80211_sme_assoc_timeout(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        if (!wdev->conn)
                return;

        wdev->conn->state = CFG80211_CONN_ASSOC_FAILED_TIMEOUT;
        schedule_work(&rdev->conn_work);
}

void cfg80211_sme_abandon_assoc(struct wireless_dev *wdev)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        if (!wdev->conn)
                return;

        wdev->conn->state = CFG80211_CONN_ABANDON;
        schedule_work(&rdev->conn_work);
}

static int cfg80211_sme_get_conn_ies(struct wireless_dev *wdev,
                                     const u8 *ies, size_t ies_len,
                                     const u8 **out_ies, size_t *out_ies_len)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        u8 *buf;
        size_t offs;

        if (!rdev->wiphy.extended_capabilities_len ||
            (ies && cfg80211_find_ie(WLAN_EID_EXT_CAPABILITY, ies, ies_len))) {
                *out_ies = kmemdup(ies, ies_len, GFP_KERNEL);
                if (!*out_ies)
                        return -ENOMEM;
                *out_ies_len = ies_len;
                return 0;
        }

        buf = kmalloc(ies_len + rdev->wiphy.extended_capabilities_len + 2,
                      GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        if (ies_len) {
                static const u8 before_extcapa[] = {
                        /* not listing IEs expected to be created by driver */
                        WLAN_EID_RSN,
                        WLAN_EID_QOS_CAPA,
                        WLAN_EID_RRM_ENABLED_CAPABILITIES,
                        WLAN_EID_MOBILITY_DOMAIN,
                        WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
                        WLAN_EID_BSS_COEX_2040,
                };

                offs = ieee80211_ie_split(ies, ies_len, before_extcapa,
                                          ARRAY_SIZE(before_extcapa), 0);
                memcpy(buf, ies, offs);
                /* leave a whole for extended capabilities IE */
                memcpy(buf + offs + rdev->wiphy.extended_capabilities_len + 2,
                       ies + offs, ies_len - offs);
        } else {
                offs = 0;
        }

        /* place extended capabilities IE (with only driver capabilities) */
        buf[offs] = WLAN_EID_EXT_CAPABILITY;
        buf[offs + 1] = rdev->wiphy.extended_capabilities_len;
        memcpy(buf + offs + 2,
               rdev->wiphy.extended_capabilities,
               rdev->wiphy.extended_capabilities_len);

        *out_ies = buf;
        *out_ies_len = ies_len + rdev->wiphy.extended_capabilities_len + 2;

        return 0;
}

static int cfg80211_sme_connect(struct wireless_dev *wdev,
                                struct cfg80211_connect_params *connect,
                                const u8 *prev_bssid)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_bss *bss;
        int err;

        if (!rdev->ops->auth || !rdev->ops->assoc)
                return -EOPNOTSUPP;

        if (wdev->current_bss) {
                cfg80211_unhold_bss(wdev->current_bss);
                cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
                wdev->current_bss = NULL;

                cfg80211_sme_free(wdev);
        }

        if (wdev->conn)
                return -EINPROGRESS;

        wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
        if (!wdev->conn)
                return -ENOMEM;

        /*
         * Copy all parameters, and treat explicitly IEs, BSSID, SSID.
         */
        memcpy(&wdev->conn->params, connect, sizeof(*connect));
        if (connect->bssid) {
                wdev->conn->params.bssid = wdev->conn->bssid;
                memcpy(wdev->conn->bssid, connect->bssid, ETH_ALEN);
        }

        if (cfg80211_sme_get_conn_ies(wdev, connect->ie, connect->ie_len,
                                      &wdev->conn->ie,
                                      &wdev->conn->params.ie_len)) {
                kfree(wdev->conn);
                wdev->conn = NULL;
                return -ENOMEM;
        }
        wdev->conn->params.ie = wdev->conn->ie;

        if (connect->auth_type == NL80211_AUTHTYPE_AUTOMATIC) {
                wdev->conn->auto_auth = true;
                /* start with open system ... should mostly work */
                wdev->conn->params.auth_type =
                        NL80211_AUTHTYPE_OPEN_SYSTEM;
        } else {
                wdev->conn->auto_auth = false;
        }

        wdev->conn->params.ssid = wdev->ssid;
        wdev->conn->params.ssid_len = wdev->ssid_len;

        /* see if we have the bss already */
        bss = cfg80211_get_conn_bss(wdev);

        if (prev_bssid) {
                memcpy(wdev->conn->prev_bssid, prev_bssid, ETH_ALEN);
                wdev->conn->prev_bssid_valid = true;
        }

        /* we're good if we have a matching bss struct */
        if (bss) {
                enum nl80211_timeout_reason treason;

                err = cfg80211_conn_do_work(wdev, &treason);
                cfg80211_put_bss(wdev->wiphy, bss);
        } else {
                /* otherwise we'll need to scan for the AP first */
                err = cfg80211_conn_scan(wdev);

                /*
                 * If we can't scan right now, then we need to scan again
                 * after the current scan finished, since the parameters
                 * changed (unless we find a good AP anyway).
                 */
                if (err == -EBUSY) {
                        err = 0;
                        wdev->conn->state = CFG80211_CONN_SCAN_AGAIN;
                }
        }

        if (err)
                cfg80211_sme_free(wdev);

        return err;
}

static int cfg80211_sme_disconnect(struct wireless_dev *wdev, u16 reason)
{
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        int err;

        if (!wdev->conn)
                return 0;

        if (!rdev->ops->deauth)
                return -EOPNOTSUPP;

        if (wdev->conn->state == CFG80211_CONN_SCANNING ||
            wdev->conn->state == CFG80211_CONN_SCAN_AGAIN) {
                err = 0;
                goto out;
        }

        /* wdev->conn->params.bssid must be set if > SCANNING */
        err = cfg80211_mlme_deauth(rdev, wdev->netdev,
                                   wdev->conn->params.bssid,
                                   NULL, 0, reason, false);
 out:
        cfg80211_sme_free(wdev);
        return err;
}

/*
 * code shared for in-device and software SME
 */

static bool cfg80211_is_all_idle(void)
{
        struct cfg80211_registered_device *rdev;
        struct wireless_dev *wdev;
        bool is_all_idle = true;

        /*
         * All devices must be idle as otherwise if you are actively
         * scanning some new beacon hints could be learned and would
         * count as new regulatory hints.
         * Also if there is any other active beaconing interface we
         * need not issue a disconnect hint and reset any info such
         * as chan dfs state, etc.
         */
        list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
                list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
                        wdev_lock(wdev);
                        if (wdev->conn || wdev->current_bss ||
                            cfg80211_beaconing_iface_active(wdev))
                                is_all_idle = false;
                        wdev_unlock(wdev);
                }
        }

        return is_all_idle;
}

static void disconnect_work(struct work_struct *work)
{
        rtnl_lock();
        if (cfg80211_is_all_idle())
                regulatory_hint_disconnect();
        rtnl_unlock();
}

DECLARE_WORK(cfg80211_disconnect_work, disconnect_work);


/*
 * API calls for drivers implementing connect/disconnect and
 * SME event handling
 */

/* This method must consume bss one way or another */
void __cfg80211_connect_result(struct net_device *dev,
                               struct cfg80211_connect_resp_params *cr,
                               bool wextev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        const u8 *country_ie;
#ifdef CONFIG_CFG80211_WEXT
        union iwreq_data wrqu;
#endif

        ASSERT_WDEV_LOCK(wdev);

        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
                    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT)) {
                cfg80211_put_bss(wdev->wiphy, cr->bss);
                return;
        }

        wdev->unprot_beacon_reported = 0;
        nl80211_send_connect_result(wiphy_to_rdev(wdev->wiphy), dev, cr,
                                    GFP_KERNEL);

#ifdef CONFIG_CFG80211_WEXT
        if (wextev) {
                if (cr->req_ie && cr->status == WLAN_STATUS_SUCCESS) {
                        memset(&wrqu, 0, sizeof(wrqu));
                        wrqu.data.length = cr->req_ie_len;
                        wireless_send_event(dev, IWEVASSOCREQIE, &wrqu,
                                            cr->req_ie);
                }

                if (cr->resp_ie && cr->status == WLAN_STATUS_SUCCESS) {
                        memset(&wrqu, 0, sizeof(wrqu));
                        wrqu.data.length = cr->resp_ie_len;
                        wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu,
                                            cr->resp_ie);
                }

                memset(&wrqu, 0, sizeof(wrqu));
                wrqu.ap_addr.sa_family = ARPHRD_ETHER;
                if (cr->bssid && cr->status == WLAN_STATUS_SUCCESS) {
                        memcpy(wrqu.ap_addr.sa_data, cr->bssid, ETH_ALEN);
                        memcpy(wdev->wext.prev_bssid, cr->bssid, ETH_ALEN);
                        wdev->wext.prev_bssid_valid = true;
                }
                wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
        }
#endif

        if (!cr->bss && (cr->status == WLAN_STATUS_SUCCESS)) {
                WARN_ON_ONCE(!wiphy_to_rdev(wdev->wiphy)->ops->connect);
                cr->bss = cfg80211_get_bss(wdev->wiphy, NULL, cr->bssid,
                                           wdev->ssid, wdev->ssid_len,
                                           wdev->conn_bss_type,
                                           IEEE80211_PRIVACY_ANY);
                if (cr->bss)
                        cfg80211_hold_bss(bss_from_pub(cr->bss));
        }

        if (wdev->current_bss) {
                cfg80211_unhold_bss(wdev->current_bss);
                cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
                wdev->current_bss = NULL;
        }

        if (cr->status != WLAN_STATUS_SUCCESS) {
                kfree_sensitive(wdev->connect_keys);
                wdev->connect_keys = NULL;
                wdev->ssid_len = 0;
                wdev->conn_owner_nlportid = 0;
                if (cr->bss) {
                        cfg80211_unhold_bss(bss_from_pub(cr->bss));
                        cfg80211_put_bss(wdev->wiphy, cr->bss);
                }
                cfg80211_sme_free(wdev);
                return;
        }

        if (WARN_ON(!cr->bss))
                return;

        wdev->current_bss = bss_from_pub(cr->bss);

        if (!(wdev->wiphy->flags & WIPHY_FLAG_HAS_STATIC_WEP))
                cfg80211_upload_connect_keys(wdev);

        rcu_read_lock();
        country_ie = ieee80211_bss_get_ie(cr->bss, WLAN_EID_COUNTRY);
        if (!country_ie) {
                rcu_read_unlock();
                return;
        }

        country_ie = kmemdup(country_ie, 2 + country_ie[1], GFP_ATOMIC);
        rcu_read_unlock();

        if (!country_ie)
                return;

        /*
         * ieee80211_bss_get_ie() ensures we can access:
         * - country_ie + 2, the start of the country ie data, and
         * - and country_ie[1] which is the IE length
         */
        regulatory_hint_country_ie(wdev->wiphy, cr->bss->channel->band,
                                   country_ie + 2, country_ie[1]);
        kfree(country_ie);
}

/* Consumes bss object one way or another */
void cfg80211_connect_done(struct net_device *dev,
                           struct cfg80211_connect_resp_params *params,
                           gfp_t gfp)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_event *ev;
        unsigned long flags;
        u8 *next;

        if (params->bss) {
                struct cfg80211_internal_bss *ibss = bss_from_pub(params->bss);

                if (list_empty(&ibss->list)) {
                        struct cfg80211_bss *found = NULL, *tmp = params->bss;

                        found = cfg80211_get_bss(wdev->wiphy, NULL,
                                                 params->bss->bssid,
                                                 wdev->ssid, wdev->ssid_len,
                                                 wdev->conn_bss_type,
                                                 IEEE80211_PRIVACY_ANY);
                        if (found) {
                                /* The same BSS is already updated so use it
                                 * instead, as it has latest info.
                                 */
                                params->bss = found;
                        } else {
                                /* Update with BSS provided by driver, it will
                                 * be freshly added and ref cnted, we can free
                                 * the old one.
                                 *
                                 * signal_valid can be false, as we are not
                                 * expecting the BSS to be found.
                                 *
                                 * keep the old timestamp to avoid confusion
                                 */
                                cfg80211_bss_update(rdev, ibss, false,
                                                    ibss->ts);
                        }

                        cfg80211_put_bss(wdev->wiphy, tmp);
                }
        }

        ev = kzalloc(sizeof(*ev) + (params->bssid ? ETH_ALEN : 0) +
                     params->req_ie_len + params->resp_ie_len +
                     params->fils.kek_len + params->fils.pmk_len +
                     (params->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
        if (!ev) {
                cfg80211_put_bss(wdev->wiphy, params->bss);
                return;
        }

        ev->type = EVENT_CONNECT_RESULT;
        next = ((u8 *)ev) + sizeof(*ev);
        if (params->bssid) {
                ev->cr.bssid = next;
                memcpy((void *)ev->cr.bssid, params->bssid, ETH_ALEN);
                next += ETH_ALEN;
        }
        if (params->req_ie_len) {
                ev->cr.req_ie = next;
                ev->cr.req_ie_len = params->req_ie_len;
                memcpy((void *)ev->cr.req_ie, params->req_ie,
                       params->req_ie_len);
                next += params->req_ie_len;
        }
        if (params->resp_ie_len) {
                ev->cr.resp_ie = next;
                ev->cr.resp_ie_len = params->resp_ie_len;
                memcpy((void *)ev->cr.resp_ie, params->resp_ie,
                       params->resp_ie_len);
                next += params->resp_ie_len;
        }
        if (params->fils.kek_len) {
                ev->cr.fils.kek = next;
                ev->cr.fils.kek_len = params->fils.kek_len;
                memcpy((void *)ev->cr.fils.kek, params->fils.kek,
                       params->fils.kek_len);
                next += params->fils.kek_len;
        }
        if (params->fils.pmk_len) {
                ev->cr.fils.pmk = next;
                ev->cr.fils.pmk_len = params->fils.pmk_len;
                memcpy((void *)ev->cr.fils.pmk, params->fils.pmk,
                       params->fils.pmk_len);
                next += params->fils.pmk_len;
        }
        if (params->fils.pmkid) {
                ev->cr.fils.pmkid = next;
                memcpy((void *)ev->cr.fils.pmkid, params->fils.pmkid,
                       WLAN_PMKID_LEN);
                next += WLAN_PMKID_LEN;
        }
        ev->cr.fils.update_erp_next_seq_num = params->fils.update_erp_next_seq_num;
        if (params->fils.update_erp_next_seq_num)
                ev->cr.fils.erp_next_seq_num = params->fils.erp_next_seq_num;
        if (params->bss)
                cfg80211_hold_bss(bss_from_pub(params->bss));
        ev->cr.bss = params->bss;
        ev->cr.status = params->status;
        ev->cr.timeout_reason = params->timeout_reason;

        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_connect_done);

/* Consumes bss object one way or another */
void __cfg80211_roamed(struct wireless_dev *wdev,
                       struct cfg80211_roam_info *info)
{
#ifdef CONFIG_CFG80211_WEXT
        union iwreq_data wrqu;
#endif
        ASSERT_WDEV_LOCK(wdev);

        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
                    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
                goto out;

        if (WARN_ON(!wdev->current_bss))
                goto out;

        cfg80211_unhold_bss(wdev->current_bss);
        cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
        wdev->current_bss = NULL;

        if (WARN_ON(!info->bss))
                return;

        cfg80211_hold_bss(bss_from_pub(info->bss));
        wdev->current_bss = bss_from_pub(info->bss);

        wdev->unprot_beacon_reported = 0;
        nl80211_send_roamed(wiphy_to_rdev(wdev->wiphy),
                            wdev->netdev, info, GFP_KERNEL);

#ifdef CONFIG_CFG80211_WEXT
        if (info->req_ie) {
                memset(&wrqu, 0, sizeof(wrqu));
                wrqu.data.length = info->req_ie_len;
                wireless_send_event(wdev->netdev, IWEVASSOCREQIE,
                                    &wrqu, info->req_ie);
        }

        if (info->resp_ie) {
                memset(&wrqu, 0, sizeof(wrqu));
                wrqu.data.length = info->resp_ie_len;
                wireless_send_event(wdev->netdev, IWEVASSOCRESPIE,
                                    &wrqu, info->resp_ie);
        }

        memset(&wrqu, 0, sizeof(wrqu));
        wrqu.ap_addr.sa_family = ARPHRD_ETHER;
        memcpy(wrqu.ap_addr.sa_data, info->bss->bssid, ETH_ALEN);
        memcpy(wdev->wext.prev_bssid, info->bss->bssid, ETH_ALEN);
        wdev->wext.prev_bssid_valid = true;
        wireless_send_event(wdev->netdev, SIOCGIWAP, &wrqu, NULL);
#endif

        return;
out:
        cfg80211_put_bss(wdev->wiphy, info->bss);
}

/* Consumes info->bss object one way or another */
void cfg80211_roamed(struct net_device *dev, struct cfg80211_roam_info *info,
                     gfp_t gfp)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_event *ev;
        unsigned long flags;
        u8 *next;

        if (!info->bss) {
                info->bss = cfg80211_get_bss(wdev->wiphy, info->channel,
                                             info->bssid, wdev->ssid,
                                             wdev->ssid_len,
                                             wdev->conn_bss_type,
                                             IEEE80211_PRIVACY_ANY);
        }

        if (WARN_ON(!info->bss))
                return;

        ev = kzalloc(sizeof(*ev) + info->req_ie_len + info->resp_ie_len +
                     info->fils.kek_len + info->fils.pmk_len +
                     (info->fils.pmkid ? WLAN_PMKID_LEN : 0), gfp);
        if (!ev) {
                cfg80211_put_bss(wdev->wiphy, info->bss);
                return;
        }

        ev->type = EVENT_ROAMED;
        next = ((u8 *)ev) + sizeof(*ev);
        if (info->req_ie_len) {
                ev->rm.req_ie = next;
                ev->rm.req_ie_len = info->req_ie_len;
                memcpy((void *)ev->rm.req_ie, info->req_ie, info->req_ie_len);
                next += info->req_ie_len;
        }
        if (info->resp_ie_len) {
                ev->rm.resp_ie = next;
                ev->rm.resp_ie_len = info->resp_ie_len;
                memcpy((void *)ev->rm.resp_ie, info->resp_ie,
                       info->resp_ie_len);
                next += info->resp_ie_len;
        }
        if (info->fils.kek_len) {

                ev->rm.fils.kek = next;
                ev->rm.fils.kek_len = info->fils.kek_len;
                memcpy((void *)ev->rm.fils.kek, info->fils.kek,
                       info->fils.kek_len);
                next += info->fils.kek_len;
        }
        if (info->fils.pmk_len) {
                ev->rm.fils.pmk = next;
                ev->rm.fils.pmk_len = info->fils.pmk_len;
                memcpy((void *)ev->rm.fils.pmk, info->fils.pmk,
                       info->fils.pmk_len);
                next += info->fils.pmk_len;
        }
        if (info->fils.pmkid) {
                ev->rm.fils.pmkid = next;
                memcpy((void *)ev->rm.fils.pmkid, info->fils.pmkid,
                       WLAN_PMKID_LEN);
                next += WLAN_PMKID_LEN;
        }
        ev->rm.fils.update_erp_next_seq_num = info->fils.update_erp_next_seq_num;
        if (info->fils.update_erp_next_seq_num)
                ev->rm.fils.erp_next_seq_num = info->fils.erp_next_seq_num;
        ev->rm.bss = info->bss;

        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_roamed);

void __cfg80211_port_authorized(struct wireless_dev *wdev, const u8 *bssid)
{
        ASSERT_WDEV_LOCK(wdev);

        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION))
                return;

        if (WARN_ON(!wdev->current_bss) ||
            WARN_ON(!ether_addr_equal(wdev->current_bss->pub.bssid, bssid)))
                return;

        nl80211_send_port_authorized(wiphy_to_rdev(wdev->wiphy), wdev->netdev,
                                     bssid);
}

void cfg80211_port_authorized(struct net_device *dev, const u8 *bssid,
                              gfp_t gfp)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_event *ev;
        unsigned long flags;

        if (WARN_ON(!bssid))
                return;

        ev = kzalloc(sizeof(*ev), gfp);
        if (!ev)
                return;

        ev->type = EVENT_PORT_AUTHORIZED;
        memcpy(ev->pa.bssid, bssid, ETH_ALEN);

        /*
         * Use the wdev event list so that if there are pending
         * connected/roamed events, they will be reported first.
         */
        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_port_authorized);

void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
                             size_t ie_len, u16 reason, bool from_ap)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        int i;
#ifdef CONFIG_CFG80211_WEXT
        union iwreq_data wrqu;
#endif

        ASSERT_WDEV_LOCK(wdev);

        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_STATION &&
                    wdev->iftype != NL80211_IFTYPE_P2P_CLIENT))
                return;

        if (wdev->current_bss) {
                cfg80211_unhold_bss(wdev->current_bss);
                cfg80211_put_bss(wdev->wiphy, &wdev->current_bss->pub);
        }

        wdev->current_bss = NULL;
        wdev->ssid_len = 0;
        wdev->conn_owner_nlportid = 0;
        kfree_sensitive(wdev->connect_keys);
        wdev->connect_keys = NULL;

        nl80211_send_disconnected(rdev, dev, reason, ie, ie_len, from_ap);

        /* stop critical protocol if supported */
        if (rdev->ops->crit_proto_stop && rdev->crit_proto_nlportid) {
                rdev->crit_proto_nlportid = 0;
                rdev_crit_proto_stop(rdev, wdev);
        }

        /*
         * Delete all the keys ... pairwise keys can't really
         * exist any more anyway, but default keys might.
         */
        if (rdev->ops->del_key) {
                int max_key_idx = 5;

                if (wiphy_ext_feature_isset(
                            wdev->wiphy,
                            NL80211_EXT_FEATURE_BEACON_PROTECTION) ||
                    wiphy_ext_feature_isset(
                            wdev->wiphy,
                            NL80211_EXT_FEATURE_BEACON_PROTECTION_CLIENT))
                        max_key_idx = 7;
                for (i = 0; i <= max_key_idx; i++)
                        rdev_del_key(rdev, dev, i, false, NULL);
        }

        rdev_set_qos_map(rdev, dev, NULL);

#ifdef CONFIG_CFG80211_WEXT
        memset(&wrqu, 0, sizeof(wrqu));
        wrqu.ap_addr.sa_family = ARPHRD_ETHER;
        wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
        wdev->wext.connect.ssid_len = 0;
#endif

        schedule_work(&cfg80211_disconnect_work);
}

void cfg80211_disconnected(struct net_device *dev, u16 reason,
                           const u8 *ie, size_t ie_len,
                           bool locally_generated, gfp_t gfp)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
        struct cfg80211_event *ev;
        unsigned long flags;

        ev = kzalloc(sizeof(*ev) + ie_len, gfp);
        if (!ev)
                return;

        ev->type = EVENT_DISCONNECTED;
        ev->dc.ie = ((u8 *)ev) + sizeof(*ev);
        ev->dc.ie_len = ie_len;
        memcpy((void *)ev->dc.ie, ie, ie_len);
        ev->dc.reason = reason;
        ev->dc.locally_generated = locally_generated;

        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_disconnected);

/*
 * API calls for nl80211/wext compatibility code
 */
int cfg80211_connect(struct cfg80211_registered_device *rdev,
                     struct net_device *dev,
                     struct cfg80211_connect_params *connect,
                     struct cfg80211_cached_keys *connkeys,
                     const u8 *prev_bssid)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        int err;

        ASSERT_WDEV_LOCK(wdev);

        /*
         * If we have an ssid_len, we're trying to connect or are
         * already connected, so reject a new SSID unless it's the
         * same (which is the case for re-association.)
         */
        if (wdev->ssid_len &&
            (wdev->ssid_len != connect->ssid_len ||
             memcmp(wdev->ssid, connect->ssid, wdev->ssid_len)))
                return -EALREADY;

        /*
         * If connected, reject (re-)association unless prev_bssid
         * matches the current BSSID.
         */
        if (wdev->current_bss) {
                if (!prev_bssid)
                        return -EALREADY;
                if (!ether_addr_equal(prev_bssid, wdev->current_bss->pub.bssid))
                        return -ENOTCONN;
        }

        /*
         * Reject if we're in the process of connecting with WEP,
         * this case isn't very interesting and trying to handle
         * it would make the code much more complex.
         */
        if (wdev->connect_keys)
                return -EINPROGRESS;

        cfg80211_oper_and_ht_capa(&connect->ht_capa_mask,
                                  rdev->wiphy.ht_capa_mod_mask);
        cfg80211_oper_and_vht_capa(&connect->vht_capa_mask,
                                   rdev->wiphy.vht_capa_mod_mask);

        if (connkeys && connkeys->def >= 0) {
                int idx;
                u32 cipher;

                idx = connkeys->def;
                cipher = connkeys->params[idx].cipher;
                /* If given a WEP key we may need it for shared key auth */
                if (cipher == WLAN_CIPHER_SUITE_WEP40 ||
                    cipher == WLAN_CIPHER_SUITE_WEP104) {
                        connect->key_idx = idx;
                        connect->key = connkeys->params[idx].key;
                        connect->key_len = connkeys->params[idx].key_len;

                        /*
                         * If ciphers are not set (e.g. when going through
                         * iwconfig), we have to set them appropriately here.
                         */
                        if (connect->crypto.cipher_group == 0)
                                connect->crypto.cipher_group = cipher;

                        if (connect->crypto.n_ciphers_pairwise == 0) {
                                connect->crypto.n_ciphers_pairwise = 1;
                                connect->crypto.ciphers_pairwise[0] = cipher;
                        }
                }

                connect->crypto.wep_keys = connkeys->params;
                connect->crypto.wep_tx_key = connkeys->def;
        } else {
                if (WARN_ON(connkeys))
                        return -EINVAL;
        }

        wdev->connect_keys = connkeys;
        memcpy(wdev->ssid, connect->ssid, connect->ssid_len);
        wdev->ssid_len = connect->ssid_len;

        wdev->conn_bss_type = connect->pbss ? IEEE80211_BSS_TYPE_PBSS :
                                              IEEE80211_BSS_TYPE_ESS;

        if (!rdev->ops->connect)
                err = cfg80211_sme_connect(wdev, connect, prev_bssid);
        else
                err = rdev_connect(rdev, dev, connect);

        if (err) {
                wdev->connect_keys = NULL;
                /*
                 * This could be reassoc getting refused, don't clear
                 * ssid_len in that case.
                 */
                if (!wdev->current_bss)
                        wdev->ssid_len = 0;
                return err;
        }

        return 0;
}

int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
                        struct net_device *dev, u16 reason, bool wextev)
{
        struct wireless_dev *wdev = dev->ieee80211_ptr;
        int err = 0;

        ASSERT_WDEV_LOCK(wdev);

        kfree_sensitive(wdev->connect_keys);
        wdev->connect_keys = NULL;

        wdev->conn_owner_nlportid = 0;

        if (wdev->conn)
                err = cfg80211_sme_disconnect(wdev, reason);
        else if (!rdev->ops->disconnect)
                cfg80211_mlme_down(rdev, dev);
        else if (wdev->ssid_len)
                err = rdev_disconnect(rdev, dev, reason);

        /*
         * Clear ssid_len unless we actually were fully connected,
         * in which case cfg80211_disconnected() will take care of
         * this later.
         */
        if (!wdev->current_bss)
                wdev->ssid_len = 0;

        return err;
}

/*
 * Used to clean up after the connection / connection attempt owner socket
 * disconnects
 */
void cfg80211_autodisconnect_wk(struct work_struct *work)
{
        struct wireless_dev *wdev =
                container_of(work, struct wireless_dev, disconnect_wk);
        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);

        wdev_lock(wdev);

        if (wdev->conn_owner_nlportid) {
                switch (wdev->iftype) {
                case NL80211_IFTYPE_ADHOC:
                        __cfg80211_leave_ibss(rdev, wdev->netdev, false);
                        break;
                case NL80211_IFTYPE_AP:
                case NL80211_IFTYPE_P2P_GO:
                        __cfg80211_stop_ap(rdev, wdev->netdev, false);
                        break;
                case NL80211_IFTYPE_MESH_POINT:
                        __cfg80211_leave_mesh(rdev, wdev->netdev);
                        break;
                case NL80211_IFTYPE_STATION:
                case NL80211_IFTYPE_P2P_CLIENT:
                        /*
                         * Use disconnect_bssid if still connecting and
                         * ops->disconnect not implemented.  Otherwise we can
                         * use cfg80211_disconnect.
                         */
                        if (rdev->ops->disconnect || wdev->current_bss)
                                cfg80211_disconnect(rdev, wdev->netdev,
                                                    WLAN_REASON_DEAUTH_LEAVING,
                                                    true);
                        else
                                cfg80211_mlme_deauth(rdev, wdev->netdev,
                                                     wdev->disconnect_bssid,
                                                     NULL, 0,
                                                     WLAN_REASON_DEAUTH_LEAVING,
                                                     false);
                        break;
                default:
                        break;
                }
        }

        wdev_unlock(wdev);
}