// SPDX-License-Identifier: GPL-2.0-only
/*
 * Scanning implementation
 *
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 * Copyright 2013-2015  Intel Mobile Communications GmbH
 * Copyright 2016-2017  Intel Deutschland GmbH
 * Copyright (C) 2018-2021 Intel Corporation
 */


#include <mac80211.h>

#include "ieee80211_i.h"
#include "driver-ops.h"
#include <img_mac80211_types.h>
#include <img_mac80211_osal.h>
#include <img_list_osal.h>
#include <jiffies.h>
#include <linux_bitops.h>
#include "umac_debugs.h"
#include "host_rpu_umac_if.h"
#include "core.h"

#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)

RETENTION_MEM_SECTION_UNINITIALIZED extern unsigned int sleepEnable;
RETENTION_MEM_SECTION_UNINITIALIZED struct non_trans_mbssid nontrans_mbssid;
#ifndef BSS_OPTIMIZATION
int send_bss_to_host(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev, struct cfg80211_bss *cbss);
#endif

int send_ssid_matched_bss_to_host(struct ieee80211_local *local, struct ieee80211_rx_status *rx_status, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_channel *channel, unsigned long ts);
void ieee80211_rx_bss_put(struct ieee80211_local *local,
		struct ieee80211_bss *bss)
{
	if (!bss)
		return;
	cfg80211_put_bss(local->hw.wiphy,
			container_of((void *)bss, struct cfg80211_bss, priv));
}

bool is_uapsd_supported(struct ieee802_11_elems *elems)
{
	u8 qos_info;

	if (elems->wmm_info && elems->wmm_info_len == 7
			&& elems->wmm_info[5] == 1)
		qos_info = elems->wmm_info[6];
	else if (elems->wmm_param && elems->wmm_param_len == 24
			&& elems->wmm_param[5] == 1)
		qos_info = elems->wmm_param[6];
	else
		/* no valid wmm information or parameter element found */
		return false;

	return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
}

#ifdef BSS_OPTIMIZATION
#define WEP40_MODE 0x01
#define WEP104_MODE 0x05
#define TKIP_MODE 0x02
#define CCMP_MODE 0x04
#define WPA3_SAE 0x08
#define EAP_MODE 0x01

int parse_security_type(struct umac_display_bss *cbss_display, const u8 *rsn, u8 rsn_len)
{
	u8 security_type = rsn[5];
	u8 akm_type = rsn[17];
	switch (security_type) {
	case TKIP_MODE:
		cbss_display->display_bss_info.security_type = NRF_WIFI_WPA;
		break;
	case CCMP_MODE:
		cbss_display->display_bss_info.security_type = NRF_WIFI_WPA2;
		break;
	case WEP40_MODE:
	case WEP104_MODE:
		cbss_display->display_bss_info.security_type = NRF_WIFI_WEP;
		break;
	default:
		cbss_display->display_bss_info.security_type = NRF_WIFI_OPEN;
		break;
	}
	if (akm_type == WPA3_SAE) {
		cbss_display->display_bss_info.security_type = NRF_WIFI_WPA3;
	}

	if (rsn_len >=  24) { /*Mixed mode case*/
		akm_type = rsn[21];
	}

	if (akm_type == EAP_MODE) {
		cbss_display->display_bss_info.security_type = NRF_WIFI_EAP;
	}
	return 0;
}

int update_multiple_bssid(struct cfg80211_registered_device *rdev, struct umac_display_bss *cbss_display, const u8 *start, size_t len, struct ieee802_11_elems *elems, u8 *transmitter_bssid, u8 *bss_bssid)
{
	const struct element *mbssid_elem, *sub;
	struct element *sub_temp = NULL;
	struct umac_display_bss *new_cbss_display =  NULL;
	u8 *nontransmitted_profile;
	size_t profile_len = 0;


	nontransmitted_profile = kmalloc(len, GFP_ATOMIC);

	if (!bss_bssid || !transmitter_bssid) {
		kfree(nontransmitted_profile);
		return 0;
	}

	mbssid_elem = (struct element *)cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, start, len);

	for_each_element(sub, elems->mbssid_ie + 1, elems->mbssid_ie_len - 1) {
		u8 new_bssid[ETH_ALEN];
		const u8 *nontrans_bssid_index_ie;
		const u8 *nontrans_capab_ie;
		const u8 *nontrans_ssid_ie;
		const u8 *nontrans_rsn_ie;
		u8 ssid_updated = 1;

		if (sub->id != 0 || sub->datalen < 4) {
			continue;   /* not a valid BSS profile */
		}

		new_cbss_display = kzalloc(sizeof(struct umac_display_bss), GFP_KERNEL);
		memcpy(new_cbss_display, cbss_display, sizeof(struct umac_display_bss));

		memset(nontransmitted_profile, 0, len);
		profile_len = cfg80211_merge_profile(start, len, mbssid_elem, sub,
				nontransmitted_profile, len);

		/*Generating new bssid's using bssid index subelement and updating*/
		nontrans_bssid_index_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, nontransmitted_profile,	profile_len);
		if (!nontrans_bssid_index_ie || nontrans_bssid_index_ie[1] < 1 || nontrans_bssid_index_ie[2] == 0) {
			continue; /* Invalid MBSSID Index element */
		}
		cfg80211_gen_new_bssid(transmitter_bssid, elems->mbssid_ie[0], nontrans_bssid_index_ie[2], new_bssid);
		memcpy(new_cbss_display->display_bss_info.mac_addr, new_bssid, ETH_ALEN);

		/*Geting non transmitted bssid capabilities*/
		nontrans_capab_ie = cfg80211_find_ie(WLAN_EID_NON_TX_BSSID_CAP, nontransmitted_profile, profile_len);
		if (nontrans_capab_ie) {
			new_cbss_display->display_bss_info.capability = nontrans_capab_ie[2];
		}

		/*Getting non transmtted ssid & updating */
		nontrans_ssid_ie = cfg80211_find_ie(WLAN_EID_SSID, nontransmitted_profile, profile_len);
		if (nontrans_ssid_ie) {
			memset(new_cbss_display->display_bss_info.ssid.nrf_wifi_ssid, 0 , NRF_WIFI_MAX_SSID_LEN);
			memcpy(new_cbss_display->display_bss_info.ssid.nrf_wifi_ssid, nontrans_ssid_ie + 2, nontrans_ssid_ie[1]);
			new_cbss_display->display_bss_info.ssid.nrf_wifi_ssid_len = nontrans_ssid_ie[1];
		}

		/*Geting non transmitted rsn capabilities*/
		nontrans_rsn_ie = cfg80211_find_ie(WLAN_EID_RSN, nontransmitted_profile, profile_len);
		if (nontrans_rsn_ie) {
			parse_security_type(new_cbss_display, nontrans_rsn_ie + 2, nontrans_rsn_ie[1]);
		}
		list_add_tail(&new_cbss_display->list, &rdev->display_bss_list);
	}

	kfree(nontransmitted_profile);
	return 0;
}

struct ieee80211_channel *
cfg80211_get_bss_channel(struct wiphy *, const u8 *, size_t,
		struct ieee80211_channel *, enum nl80211_bss_scan_width);

void umac_scan_update_display_bss_database (struct ieee80211_local *local,
		struct ieee80211_rx_status *rx_status,
		struct ieee80211_mgmt *mgmt, size_t len,
		struct ieee80211_channel *chan)
{
	struct umac_display_bss *cbss_display = NULL;
	int found = 0xff;
	struct ieee802_11_elems elems;
	size_t baselen;
	u8 security_type, akm_type,  *elements;
	struct ieee80211_channel *channel;
	u8 scan_width;
	s32 signal = 0;
	size_t ielen = len - offsetof(struct ieee80211_mgmt, u.probe_resp.variable);

	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;

	wiphy = local->hw.wiphy;
	rdev = wiphy_to_rdev(wiphy);

	/*Checking in internal database*/
	list_for_each_entry(cbss_display, &rdev->display_bss_list, list) {

		found = memcmp(mgmt->bssid, cbss_display->display_bss_info.mac_addr, ETH_ALEN);
		if (found == 0)
			break;
	}

	if (found != 0)
	{
		cbss_display = kzalloc(sizeof(struct umac_display_bss), GFP_KERNEL);
	}

	scan_width = NL80211_BSS_CHAN_WIDTH_20;
	if (rx_status->bw == RATE_INFO_BW_5)
		scan_width = NL80211_BSS_CHAN_WIDTH_5;
	else if (rx_status->bw == RATE_INFO_BW_10)
		scan_width = NL80211_BSS_CHAN_WIDTH_10;

	channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
			ielen, chan, scan_width);

	if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
		signal = 0; /* invalid signal indication */
	else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
		signal = rx_status->signal * 100;
	else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
		signal = (rx_status->signal * 100) / local->hw.max_signal;

	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
		elements = mgmt->u.probe_resp.variable;
		baselen = offsetof(struct ieee80211_mgmt,
				u.probe_resp.variable);
	} else {
		elements = mgmt->u.beacon.variable;
		baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
	}

	if (baselen > len)
		return;

	memcpy(cbss_display->display_bss_info.mac_addr, mgmt->bssid, ETH_ALEN);

	ieee802_11_parse_elems(elements, len - baselen, false, &elems,
			mgmt->bssid, cbss_display->display_bss_info.mac_addr);


	memcpy(cbss_display->display_bss_info.ssid.nrf_wifi_ssid, elems.ssid, elems.ssid_len);
	cbss_display->display_bss_info.ssid.nrf_wifi_ssid_len = elems.ssid_len;


	cbss_display->display_bss_info.nwk_band = channel->band;
	cbss_display->display_bss_info.nwk_channel = ieee80211_frequency_to_channel(channel->center_freq);
	if (cbss_display->display_bss_info.nwk_channel > 35)
		cbss_display->display_bss_info.protocol_flags = NRF_WIFI_802_11A;
	else
		cbss_display->display_bss_info.protocol_flags = NRF_WIFI_802_11G;
	cbss_display->display_bss_info.security_type = NRF_WIFI_OPEN;

	if ((elems.he_cap) || (elems.he_operation))
		cbss_display->display_bss_info.protocol_flags |= NRF_WIFI_802_11AX;
	if ((elems.vht_cap_elem) || (elems.vht_operation))
		cbss_display->display_bss_info.protocol_flags |= NRF_WIFI_802_11AC;
	if ((elems.ht_cap_elem) || (elems.ht_operation))
		cbss_display->display_bss_info.protocol_flags |= NRF_WIFI_802_11N;

	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
		cbss_display->display_bss_info.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
		cbss_display->display_bss_info.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);

	} else {
		cbss_display->display_bss_info.beacon_interval = le16_to_cpu(mgmt->u.beacon.beacon_int);
		cbss_display->display_bss_info.capability = le16_to_cpu(mgmt->u.beacon.capab_info);
	}

	if ((cbss_display->display_bss_info.protocol_flags == NRF_WIFI_802_11G) || (cbss_display->display_bss_info.protocol_flags == NRF_WIFI_802_11A)) {
		if ((cbss_display->display_bss_info.capability & (1 << 4)) && ((!elems.ht_cap_elem) || (!elems.ht_operation))) {
			cbss_display->display_bss_info.security_type = NRF_WIFI_WEP;
		}
	}

	if (elems.rsn) {
		parse_security_type(cbss_display, elems.rsn, elems.rsn_len);
	} else {   /*Handling WPA personal & WPA enterprize modes*/
		if (elems.wpa_ie) {
			cbss_display->display_bss_info.security_type = NRF_WIFI_WPA;
			if (elems.wpa_ie[25] == EAP_MODE)
				cbss_display->display_bss_info.security_type = NRF_WIFI_EAP;
		}
	}

	if (elems.ac_access_delay_ie) {
		cbss_display->display_bss_info.security_type = NRF_WIFI_WAPI;
	}

	switch (rdev->wiphy.signal_type) {
	case CFG80211_SIGNAL_TYPE_MBM:
		cbss_display->display_bss_info.signal.signal_type = NRF_WIFI_SIGNAL_TYPE_MBM;
		cbss_display->display_bss_info.signal.signal.mbm_signal = signal;
		break;
	case CFG80211_SIGNAL_TYPE_UNSPEC:
		cbss_display->display_bss_info.signal.signal_type = NRF_WIFI_SIGNAL_TYPE_UNSPEC;
		cbss_display->display_bss_info.signal.signal.unspec_signal = signal;
		break;
	default:
		break;
	}

	if (found != 0) {
		if (elems.ext_capab && (elems.ext_capab[2] & (1 << 6)) && elems.mbssid_ie)
		{
			update_multiple_bssid (rdev, cbss_display, elements, len - baselen, &elems, mgmt->bssid, cbss_display->display_bss_info.mac_addr);
		}
		list_add_tail(&cbss_display->list, &rdev->display_bss_list);
	}
	return;
}
#endif /*BSS_OPTIMIZATION*/



void ieee80211_update_bss_from_elems(struct ieee80211_local *local,
		struct ieee80211_bss *bss,
		struct ieee802_11_elems *elems,
		struct ieee80211_rx_status *rx_status,
		bool beacon)
{
	int clen, srlen;

	if (beacon)
		bss->device_ts_beacon = rx_status->device_timestamp;
	else
		bss->device_ts_presp = rx_status->device_timestamp;

	if (elems->parse_error) {
		if (beacon)
			bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
		else
			bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
	} else {
		if (beacon)
			bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
		else
			bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
	}

	/* save the ERP value so that it is available at association time */
	if (elems->erp_info && (!elems->parse_error ||
				!(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
		bss->erp_value = elems->erp_info[0];
		bss->has_erp_value = true;
		if (!elems->parse_error)
			bss->valid_data |= IEEE80211_BSS_VALID_ERP;
	}

	/* replace old supported rates if we get new values */
	if (!elems->parse_error ||
			!(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
		srlen = 0;
		if (elems->supp_rates) {
			clen = IEEE80211_MAX_SUPP_RATES;
			if (clen > elems->supp_rates_len)
				clen = elems->supp_rates_len;
			memcpy(bss->supp_rates, elems->supp_rates, clen);
			srlen += clen;
		}
		if (elems->ext_supp_rates) {
			clen = IEEE80211_MAX_SUPP_RATES - srlen;
			if (clen > elems->ext_supp_rates_len)
				clen = elems->ext_supp_rates_len;
			memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
					clen);
			srlen += clen;
		}
		if (srlen) {
			bss->supp_rates_len = srlen;
			if (!elems->parse_error)
				bss->valid_data |= IEEE80211_BSS_VALID_RATES;
		}
	}

	if (!elems->parse_error ||
			!(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
		bss->wmm_used = elems->wmm_param || elems->wmm_info;
		bss->uapsd_supported = is_uapsd_supported(elems);
		if (!elems->parse_error)
			bss->valid_data |= IEEE80211_BSS_VALID_WMM;
	}

	if (beacon) {
		struct ieee80211_supported_band *sband =
			local->hw.wiphy->bands[rx_status->band];
		if (!(rx_status->encoding == RX_ENC_HT) &&
				!(rx_status->encoding == RX_ENC_VHT))
			bss->beacon_rate =
				&sband->bitrates[rx_status->rate_idx];
	}
}

struct ieee80211_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
		struct ieee80211_rx_status *rx_status,
		struct ieee80211_mgmt *mgmt, size_t len,
		struct ieee80211_channel *channel, u8 *parent_mbssid)
{
	bool beacon = ieee80211_is_beacon(mgmt->frame_control);
	struct cfg80211_bss *cbss, *non_tx_cbss;
	struct ieee80211_bss *bss, *non_tx_bss;
	struct cfg80211_inform_bss bss_meta = {
		.boottime_ns = rx_status->boottime_ns,
	};
	bool signal_valid;
	struct ieee80211_sub_if_data *scan_sdata;
	struct ieee802_11_elems elems;
	size_t baselen;
	u8 *elements;

	if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
		bss_meta.signal = 0; /* invalid signal indication */
	else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
		bss_meta.signal = rx_status->signal * 100;
	else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
		bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;

	bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
	if (rx_status->bw == RATE_INFO_BW_5)
		bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
	else if (rx_status->bw == RATE_INFO_BW_10)
		bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;

	bss_meta.chan = channel;

	rcu_read_lock();
	scan_sdata = rcu_dereference(local->scan_sdata);
	if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
			scan_sdata->vif.bss_conf.assoc &&
			ieee80211_have_rx_timestamp(rx_status)) {
		bss_meta.parent_tsf =
			ieee80211_calculate_rx_timestamp(local, rx_status,
					len + FCS_LEN, 24);
		ether_addr_copy(bss_meta.parent_bssid,
				scan_sdata->vif.bss_conf.bssid);
	}
	rcu_read_unlock();

	cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
			mgmt, len, parent_mbssid, GFP_ATOMIC);
	if (!cbss)
		return NULL;

	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
		elements = mgmt->u.probe_resp.variable;
		baselen = offsetof(struct ieee80211_mgmt,
				u.probe_resp.variable);
	} else {
		baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
		elements = mgmt->u.beacon.variable;
	}

	if (baselen > len)
		return NULL;

	ieee802_11_parse_elems(elements, len - baselen, false, &elems,
			mgmt->bssid, cbss->bssid);

	/* In case the signal is invalid update the status */
	signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
		<= local->hw.wiphy->max_adj_channel_rssi_comp;
	if (!signal_valid)
		rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;

	bss = (void *)cbss->priv;
	ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon);

	list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
		non_tx_bss = (void *)non_tx_cbss->priv;

		ieee80211_update_bss_from_elems(local, non_tx_bss, &elems,
				rx_status, beacon);
	}

	return bss;
}

bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
		u32 scan_flags, const u8 *da)
{
	if (!sdata)
		return false;
	/* accept broadcast for OCE */
	if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
			is_broadcast_ether_addr(da))
		return true;
	if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
		return true;
	return ether_addr_equal(da, sdata->vif.addr);
}



/*Returns 1 if ssid is found or
 *        0 if not found
 *Also updates founded bss details into rdev structure
 */
int check_ssid_in_nontrans_list(struct cfg80211_registered_device *rdev, const u8 *start, struct ieee80211_mgmt *mgmt, size_t len, const struct ieee802_11_elems *elems)
{
	unsigned int i = 0;
	u8 *nontransmitted_profile;
	size_t profile_len = 0;
	const struct element *mbssid_elem;
	const struct element *sub;
	unsigned char found = 0;

	memset(&nontrans_mbssid, 0, sizeof(struct non_trans_mbssid));
	nontransmitted_profile = kmalloc(len, GFP_ATOMIC);

	mbssid_elem = (struct element *)cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, start, len);
	for_each_element(sub, elems->mbssid_ie + 1, elems->mbssid_ie_len - 1) {
		u8 new_bssid[ETH_ALEN];
		const u8 *nontrans_ssid_ie;
		const u8 *nontrans_bssid_index_ie;
		const u8 *nontrans_capab_ie;
		const u8 *nontrans_rsn_ie;

		if (sub->id != 0 || sub->datalen < 4) {
			continue;
		}

		if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
				sub->data[1] != 2) {
			continue;
		}
		memset(nontransmitted_profile, 0, len);
		profile_len = cfg80211_merge_profile(start, len, mbssid_elem, sub, nontransmitted_profile, len);

		/*1.Geting non transmitted mbssid_idx for generating new bssid*/
		nontrans_bssid_index_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, nontransmitted_profile, profile_len);

		if (!nontrans_bssid_index_ie || nontrans_bssid_index_ie[1] < 1 || nontrans_bssid_index_ie[2] == 0) {
			continue; /* Invalid MBSSID Index element */
		}
		cfg80211_gen_new_bssid(mgmt->bssid, elems->mbssid_ie[0], nontrans_bssid_index_ie[2], new_bssid);

		/*2.Geting non transmitted bssid capabilities*/
		nontrans_capab_ie = cfg80211_find_ie(WLAN_EID_NON_TX_BSSID_CAP, nontransmitted_profile, profile_len);

		/*3.Geting non transmitted rsn capabilities*/
		nontrans_rsn_ie = cfg80211_find_ie(WLAN_EID_RSN, nontransmitted_profile, profile_len);

		/*4.Geting non transmitted ssid*/
		nontrans_ssid_ie = cfg80211_find_ie(WLAN_EID_SSID, nontransmitted_profile, profile_len);

		for (i=0; i<rdev->scan_req->n_ssids; i++) {
			if (rdev->scan_req->ssids[i].ssid_len) {
				if (memcmp(nontrans_ssid_ie + 2, rdev->scan_req->ssids[i].ssid, nontrans_ssid_ie[1]) == 0) {
					found = 1;
					break;
				}
			}
		}
		if (found == 1) {
			nontrans_mbssid.num_mbssid = 1;
			memcpy(nontrans_mbssid.bssid, new_bssid, ETH_ALEN);
			nontrans_mbssid.ssid_len = nontrans_ssid_ie[1];
			nontrans_mbssid.ssid_ie =  nontrans_ssid_ie;
			memcpy(&nontrans_mbssid.ssid[0], nontrans_ssid_ie + 2, nontrans_ssid_ie[1]);
			if (nontrans_capab_ie) {
				nontrans_mbssid.capability = nontrans_capab_ie[2];
			}
			if (nontrans_rsn_ie) {
				nontrans_mbssid.rsn_len = nontrans_rsn_ie[1];
				nontrans_mbssid.rsn_ie =  nontrans_rsn_ie;
			}

			break;
		}
	}
	kfree(nontransmitted_profile);
	return found;
}

int update_mbssid_bss( struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata1, struct ieee80211_rx_status *rx_status, struct ieee80211_mgmt *mgmt,  struct sk_buff *skb, struct ieee80211_channel *channel)
{

	struct ieee80211_bss *bss;
	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;
	const u8 *ssidie, *rsnie, *new_rsnie;
	u8 *new_ssidie, *elements;
	size_t baselen;
	u8 tmp_ssidie_len, tmp_rsnie_len;
	u8 parent_mbssid[ETH_ALEN];
	wiphy = local->hw.wiphy;
	rdev = wiphy_to_rdev(wiphy);

	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
		elements = mgmt->u.probe_resp.variable;
		baselen = offsetof(struct ieee80211_mgmt,
				u.probe_resp.variable);
	} else {
		elements = mgmt->u.beacon.variable;
		baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
	}

	if (nontrans_mbssid.num_mbssid ) {

		memcpy(parent_mbssid, mgmt->bssid, ETH_ALEN);
		memcpy(mgmt->bssid, nontrans_mbssid.bssid, 6);
		mgmt->u.probe_resp.capab_info = nontrans_mbssid.capability;

		/*Updating with Non trans SSID*/
		ssidie = cfg80211_find_ie(WLAN_EID_SSID, mgmt->u.probe_resp.variable, skb->len - baselen);
		tmp_ssidie_len = ssidie[1] + 2;
		if (ssidie) {
			memcpy((void *)ssidie + 1, &nontrans_mbssid.ssid_len, tmp_ssidie_len - 1 );
		}
	}

	bss = ieee80211_bss_info_update(local, rx_status,
			mgmt, skb->len,
			channel, parent_mbssid);
	if (bss) {
		ieee80211_rx_bss_put(local, bss);
	}
	return 0;
}

void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
{
	struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_sub_if_data *sdata1, *sdata2;
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
	struct ieee80211_bss *bss;
	struct ieee80211_channel *channel;
	struct cfg80211_scan_request *scan_req;

	struct cfg80211_registered_device *rdev;
	struct wiphy *wiphy;
	struct ieee802_11_elems elems;
	wiphy = local->hw.wiphy;
	rdev = wiphy_to_rdev(wiphy);

	if (skb->len < 24 ||
			(!ieee80211_is_probe_resp(mgmt->frame_control) &&
			 !ieee80211_is_beacon(mgmt->frame_control)))
		return;

	sdata1 = rcu_dereference(local->scan_sdata);
	sdata2 = rcu_dereference(local->sched_scan_sdata);

	if (likely(!sdata1 && !sdata2))
		return;


	scan_req = rcu_dereference(local->scan_req);

	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
		struct cfg80211_sched_scan_request *sched_scan_req;
		u32 scan_req_flags = 0, sched_scan_req_flags = 0;
		sched_scan_req = rcu_dereference(local->sched_scan_req);

		if (scan_req)
			scan_req_flags = scan_req->flags;

		if (sched_scan_req)
			sched_scan_req_flags = sched_scan_req->flags;

		/* ignore ProbeResp to foreign address or non-bcast (OCE)
		 * unless scanning with randomised address
		 */
		if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
					mgmt->da) &&
				!ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
					mgmt->da))
			return;
	}

	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

	/*Filter out Beacons/Probe responses not related to SSID's present in the scan req*/
	if (rdev->scan_req->n_ssids && rdev->scan_req->ssids[0].ssid_len) {
		size_t baselen;
		u8 *elements;
		const u8 *ssidie;
		unsigned char i, found = 0;

		if (ieee80211_is_probe_resp(mgmt->frame_control)) {
			elements = mgmt->u.probe_resp.variable;
			baselen = offsetof(struct ieee80211_mgmt,
					u.probe_resp.variable);
		} else {
			baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
			elements = mgmt->u.beacon.variable;
		}

		ssidie = cfg80211_find_ie(WLAN_EID_SSID, elements, baselen);

		memset(&nontrans_mbssid, 0, sizeof(struct non_trans_mbssid));
		ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems,
				mgmt->bssid, mgmt->bssid);

		for (i=0; i<rdev->scan_req->n_ssids; i++) {
			if (rdev->scan_req->ssids[i].ssid_len) {
				if (memcmp(ssidie + 2, rdev->scan_req->ssids[i].ssid, rdev->scan_req->ssids[i].ssid_len) == 0) {
					found = 1;
					break;
				}
			}
		}

		if (!found) {
			if (elems.ext_capab && (elems.ext_capab[2] & (1 << 6)) && elems.mbssid_ie)
			{
				if (check_ssid_in_nontrans_list(rdev, elements, mgmt, skb->len - baselen, &elems)) {
					update_mbssid_bss(local, sdata1, rx_status, mgmt, skb, channel);
				}
			}
			return;
		}
	}

#ifdef BSS_OPTIMIZATION
	if (SCAN_DISPLAY == scan_req->scan_reason) {
		umac_scan_update_display_bss_database(local, rx_status,
				mgmt, skb->len,	channel);

		if (mgmt->u.beacon.capab_info & WLAN_CAPABILITY_ESS) {
			regulatory_hint_found_beacon(wiphy, channel, GFP_ATOMIC);
		}

	}else
#endif
	{
#ifdef BSS_OPTIMIZATION
		/*To get rid of other scan results in particular channel &
		  for sending specific ssid scan res to host in connect scan*/
		if (rdev->scan_req->ssids[0].ssid_len  != 0) {
			if (!is_zero_ether_addr(rdev->scan_req->mac_addr)) {  /*Added this check for p2p*/
				if (memcmp(mgmt->bssid, rdev->scan_req->mac_addr, ETH_ALEN) != 0) {
					/*Sending ssid only matched scan results to host */
					send_ssid_matched_bss_to_host(local, rx_status, mgmt, skb->len, channel, jiffies);
					return;
				}
			}
		}
#endif
		bss = ieee80211_bss_info_update(local, rx_status,
				mgmt, skb->len,
				channel, NULL);
		if (bss) {
#ifndef BSS_OPTIMIZATION
			/*Sending bss data base results to host*/
			send_bss_to_host(rdev, &sdata1->wdev, container_of((void *)bss, struct cfg80211_bss, priv));
#endif
			ieee80211_rx_bss_put(local, bss);
		}
	}
}

void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
		enum nl80211_bss_scan_width scan_width)
{
	memset(chandef, 0, sizeof(*chandef));
	switch (scan_width) {
	case NL80211_BSS_CHAN_WIDTH_5:
		chandef->width = NL80211_CHAN_WIDTH_5;
		break;
	case NL80211_BSS_CHAN_WIDTH_10:
		chandef->width = NL80211_CHAN_WIDTH_10;
		break;
	default:
		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
		break;
	}
}

/* return false if no more work */
bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
{
	struct cfg80211_scan_request *req;
	struct cfg80211_chan_def chandef;
	u8 bands_used = 0;
	int i, ielen, n_chans;
	u32 flags = 0;

	req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
		return false;

	if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
		for (i = 0; i < req->n_channels; i++) {
			local->hw_scan_req->req.channels[i] = req->channels[i];
			bands_used |= BIT(req->channels[i]->band);
		}

		n_chans = req->n_channels;
	} else {
		do {
			if (local->hw_scan_band == NUM_NL80211_BANDS)
				return false;

			n_chans = 0;

			for (i = 0; i < req->n_channels; i++) {
				if (req->channels[i]->band !=
						local->hw_scan_band)
					continue;
				local->hw_scan_req->req.channels[n_chans] =
					req->channels[i];
				n_chans++;
				bands_used |= BIT(req->channels[i]->band);
			}

			local->hw_scan_band++;
		} while (!n_chans);
	}

	local->hw_scan_req->req.n_channels = n_chans;
	ieee80211_prepare_scan_chandef(&chandef, req->scan_width);

	if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
		flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;

	ielen = ieee80211_build_preq_ies(local,
			(u8 *)local->hw_scan_req->req.ie,
			local->hw_scan_ies_bufsize,
			&local->hw_scan_req->ies,
			req->ie, req->ie_len,
			bands_used, req->rates, &chandef,
			flags);
	local->hw_scan_req->req.ie_len = ielen;
	local->hw_scan_req->req.no_cck = req->no_cck;
	ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
	ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
			req->mac_addr_mask);
	ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);

	return true;
}

void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
{
	struct ieee80211_local *local = hw_to_local(hw);
	bool hw_scan = local->ops->hw_scan ? 1 : 0;
	bool was_scanning = local->scanning;
	struct cfg80211_scan_request *scan_req;
	struct ieee80211_sub_if_data *sdata;

	lockdep_assert_held(&local->mtx);

	/*
	 * It's ok to abort a not-yet-running scan (that
	 * we have one at all will be verified by checking
	 * local->scan_req next), but not to complete it
	 * successfully.
	 */
	if (WARN_ON(!local->scanning && !aborted))
		aborted = true;

	if (WARN_ON(!local->scan_req))
		return;

	if (hw_scan && !aborted &&
			!ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
			ieee80211_prep_hw_scan(local)) {
		int rc;

		rc = drv_hw_scan(local,
				rcu_dereference_protected(local->scan_sdata,
					lockdep_is_held(&local->mtx)),
				local->hw_scan_req);

		if (rc == 0)
			return;

		/* HW scan failed and is going to be reported as aborted,
		 * so clear old scan info.
		 */
		memset(&local->scan_info, 0, sizeof(local->scan_info));
		aborted = true;
	}

	kfree(local->hw_scan_req);
	local->hw_scan_req = NULL;

	scan_req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	if (scan_req != local->int_scan_req) {
		local->scan_info.aborted = aborted;
		cfg80211_scan_done(scan_req, &local->scan_info);
	}
	RCU_INIT_POINTER(local->scan_req, NULL);

	RCU_INIT_POINTER(local->scan_sdata, NULL);

	local->scanning = 0;
	local->scan_chandef.chan = NULL;

	/* Set power back to normal operating levels. */
	ieee80211_hw_config(local, 0);

	ieee80211_recalc_idle(local);

	ieee80211_mlme_notify_scan_completed(local);
	/* Requeue all the work that might have been ignored while
	 * the scan was in progress; if there was none this will
	 * just be a no-op for the particular interface.
	 */
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_queue_work(&sdata->local->hw, &sdata->work);
	}

	if (was_scanning)
		ieee80211_start_next_roc(local);
}

void ieee80211_scan_completed(struct ieee80211_hw *hw,
		struct cfg80211_scan_info *info)
{
	struct ieee80211_local *local = hw_to_local(hw);

	trace_api_scan_completed(local, info->aborted);

	set_bit(SCAN_COMPLETED, &local->scanning);
	if (info->aborted)
		set_bit(SCAN_ABORTED, &local->scanning);

	memcpy(&local->scan_info, info, sizeof(*info));

	ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
}
EXPORT_SYMBOL(ieee80211_scan_completed);
bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *sdata_iter;

	if (!ieee80211_is_radar_required(local))
		return true;

	if (!regulatory_pre_cac_allowed(local->hw.wiphy))
		return false;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata_iter, &local->interfaces, list) {
		if (sdata_iter->wdev.cac_started) {
			mutex_unlock(&local->iflist_mtx);
			return false;
		}
	}
	mutex_unlock(&local->iflist_mtx);

	return true;
}
bool ieee80211_can_scan(struct ieee80211_local *local,
		struct ieee80211_sub_if_data *sdata)
{
	if (!__ieee80211_can_leave_ch(sdata))
		return false;

	if (!list_empty(&local->roc_list))
		return false;

	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
			sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
		return false;

	return true;
}

void ieee80211_run_deferred_scan(struct ieee80211_local *local)
{
	lockdep_assert_held(&local->mtx);

	if (!local->scan_req || local->scanning)
		return;

	if (!ieee80211_can_scan(local,
				rcu_dereference_protected(
					local->scan_sdata,
					lockdep_is_held(&local->mtx))))
		return;

	ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
			round_jiffies_relative(0));
}

void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
		const u8 *src, const u8 *dst,
		const u8 *ssid, size_t ssid_len,
		const u8 *ie, size_t ie_len,
		u32 ratemask, u32 flags, u32 tx_flags,
		struct ieee80211_channel *channel)
{
	struct sk_buff *skb;
	u32 txdata_flags = 0;

	skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
			ssid, ssid_len,
			ie, ie_len, flags);

	if (skb) {
		if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
			struct ieee80211_hdr *hdr = (void *)skb->data;
			u16 sn = prandom_u32();

			txdata_flags |= IEEE80211_TX_NO_SEQNO;
			hdr->seq_ctrl =
				cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
		}
		IEEE80211_SKB_CB(skb)->flags |= tx_flags;
		ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band,
				txdata_flags);
	}
}

void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
		unsigned long *next_delay)
{
	int i;
	struct ieee80211_sub_if_data *sdata;
	struct cfg80211_scan_request *scan_req;
	enum nl80211_band band = local->hw.conf.chandef.chan->band;
	u32 flags = 0, tx_flags;

	scan_req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
	if (scan_req->no_cck)
		tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
	if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
		flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
	if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
		flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;

	sdata = rcu_dereference_protected(local->scan_sdata,
			lockdep_is_held(&local->mtx));

	for (i = 0; i < scan_req->n_ssids; i++)
		ieee80211_send_scan_probe_req(
				sdata, local->scan_addr, scan_req->bssid,
				scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
				scan_req->ie, scan_req->ie_len,
				scan_req->rates[band], flags,
				tx_flags, local->hw.conf.chandef.chan);

	/*
	 * After sending probe requests, wait for probe responses
	 * on the channel.
	 */
	*next_delay = IEEE80211_CHANNEL_TIME;
	local->next_scan_state = SCAN_DECISION;
}

int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
		struct cfg80211_scan_request *req)
{
	struct ieee80211_local *local = sdata->local;
	bool hw_scan = (bool)local->ops->hw_scan;
	int rc;

	lockdep_assert_held(&local->mtx);

	if (local->scan_req)
		return -EBUSY;

	if (!__ieee80211_can_leave_ch(sdata))
		return -EBUSY;

	if (!ieee80211_can_scan(local, sdata)) {
		/* wait for the work to finish/time out */
		rcu_assign_pointer(local->scan_req, req);
		rcu_assign_pointer(local->scan_sdata, sdata);
		return 0;
	}

again:
	if (hw_scan) {
		u8 *ies;

		local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;

		if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
			int i, n_bands = 0;
			u8 bands_counted = 0;

			for (i = 0; i < req->n_channels; i++) {
				if (bands_counted & BIT(req->channels[i]->band))
					continue;
				bands_counted |= BIT(req->channels[i]->band);
				n_bands++;
			}

			local->hw_scan_ies_bufsize *= n_bands;
		}

		local->hw_scan_req = kmalloc(
				sizeof(*local->hw_scan_req) +
				req->n_channels * sizeof(req->channels[0]) +
				local->hw_scan_ies_bufsize, GFP_KERNEL);
		if (!local->hw_scan_req)
			return -ENOMEM;

		local->hw_scan_req->req.ssids = req->ssids;
		local->hw_scan_req->req.n_ssids = req->n_ssids;
		ies = (u8 *)local->hw_scan_req +
			sizeof(*local->hw_scan_req) +
			req->n_channels * sizeof(req->channels[0]);
		local->hw_scan_req->req.ie = ies;
		local->hw_scan_req->req.flags = req->flags;
		eth_broadcast_addr(local->hw_scan_req->req.bssid);
		local->hw_scan_req->req.duration = req->duration;
		local->hw_scan_req->req.duration_mandatory =
			req->duration_mandatory;

		local->hw_scan_band = 0;

		/*
		 * After allocating local->hw_scan_req, we must
		 * go through until ieee80211_prep_hw_scan(), so
		 * anything that might be changed here and leave
		 * this function early must not go after this
		 * allocation.
		 */
	}

	rcu_assign_pointer(local->scan_req, req);
	rcu_assign_pointer(local->scan_sdata, sdata);

	if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
		get_random_mask_addr(local->scan_addr,
				req->mac_addr,
				req->mac_addr_mask);
	else
		memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);

	if (hw_scan) {
		__set_bit(SCAN_HW_SCANNING, &local->scanning);
	} else if ((req->n_channels == 1) &&
			(req->channels[0] == local->_oper_chandef.chan)) {
		/*
		 * If we are scanning only on the operating channel
		 * then we do not need to stop normal activities
		 */
		unsigned long next_delay;

		__set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);

		ieee80211_recalc_idle(local);

		/* Notify driver scan is starting, keep order of operations
		 * same as normal software scan, in case that matters. */
		ieee80211_configure_filter(local); /* accept probe-responses */

		/* We need to ensure power level is at max for scanning. */
		ieee80211_hw_config(local, 0);

		if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
						IEEE80211_CHAN_RADAR)) ||
				!req->n_ssids) {
			next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
		} else {
			ieee80211_scan_state_send_probe(local, &next_delay);
			next_delay = IEEE80211_CHANNEL_TIME;
		}

		/* Now, just wait a bit and we are all done! */
		ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
				next_delay);
		return 0;
	} else {
		/* Do normal software scan */
		__set_bit(SCAN_SW_SCANNING, &local->scanning);
	}

	ieee80211_recalc_idle(local);

	if (hw_scan) {
		ieee80211_prep_hw_scan(local);
		rc = drv_hw_scan(local, sdata, local->hw_scan_req);
	} else {
		rc = 0;
	}

	if (rc) {
		kfree(local->hw_scan_req);
		local->hw_scan_req = NULL;
		local->scanning = 0;

		ieee80211_recalc_idle(local);

		local->scan_req = NULL;
		RCU_INIT_POINTER(local->scan_sdata, NULL);
	}

	if (hw_scan && rc == 1) {
		/*
		 * we can't fall back to software for P2P-GO
		 * as it must update NoA etc.
		 */
		if (ieee80211_vif_type_p2p(&sdata->vif) ==
				NL80211_IFTYPE_P2P_GO)
			return -EOPNOTSUPP;
		hw_scan = false;
		goto again;
	}

	return rc;
}

unsigned long
ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
{
	/*
	 * TODO: channel switching also consumes quite some time,
	 * add that delay as well to get a better estimation
	 */
	if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
		return IEEE80211_PASSIVE_CHANNEL_TIME;
	return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
}

void ieee80211_scan_state_decision(struct ieee80211_local *local,
		unsigned long *next_delay)
{
	bool associated = false;
	bool tx_empty = true;
	bool bad_latency;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_channel *next_chan;
	enum mac80211_scan_state next_scan_state;
	struct cfg80211_scan_request *scan_req;

	/*
	 * check if at least one STA interface is associated,
	 * check if at least one STA interface has pending tx frames
	 * and grab the lowest used beacon interval
	 */
	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;

		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
			if (sdata->u.mgd.associated) {
				associated = true;

				if (!qdisc_all_tx_empty(sdata->dev)) {
					tx_empty = false;
					break;
				}
			}
		}
	}
	mutex_unlock(&local->iflist_mtx);

	scan_req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	next_chan = scan_req->channels[local->scan_channel_idx];

	/*
	 * we're currently scanning a different channel, let's
	 * see if we can scan another channel without interfering
	 * with the current traffic situation.
	 *
	 * Keep good latency, do not stay off-channel more than 125 ms.
	 */

	bad_latency = time_after(jiffies +
			ieee80211_scan_get_channel_time(next_chan),
			local->leave_oper_channel_time + HZ / 8);

	if (associated && !tx_empty) {
		if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
			next_scan_state = SCAN_ABORT;
		else
			next_scan_state = SCAN_SUSPEND;
	} else if (associated && bad_latency) {
		next_scan_state = SCAN_SUSPEND;
	} else {
		next_scan_state = SCAN_SET_CHANNEL;
	}

	local->next_scan_state = next_scan_state;

	*next_delay = 0;
}

void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
		unsigned long *next_delay)
{
	int skip;
	struct ieee80211_channel *chan;
	enum nl80211_bss_scan_width oper_scan_width;
	struct cfg80211_scan_request *scan_req;

	scan_req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	skip = 0;
	chan = scan_req->channels[local->scan_channel_idx];

	local->scan_chandef.chan = chan;
	local->scan_chandef.center_freq1 = chan->center_freq;
	local->scan_chandef.center_freq2 = 0;
	switch (scan_req->scan_width) {
	case NL80211_BSS_CHAN_WIDTH_5:
		local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
		break;
	case NL80211_BSS_CHAN_WIDTH_10:
		local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
		break;
	case NL80211_BSS_CHAN_WIDTH_20:
		/* If scanning on oper channel, use whatever channel-type
		 * is currently in use.
		 */
		oper_scan_width = cfg80211_chandef_to_scan_width(
				&local->_oper_chandef);
		if (chan == local->_oper_chandef.chan &&
				oper_scan_width == scan_req->scan_width)
			local->scan_chandef = local->_oper_chandef;
		else
			local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
		break;
	}

	if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
		skip = 1;

	/* advance state machine to next channel/band */
	local->scan_channel_idx++;

	if (skip) {
		/* if we skip this channel return to the decision state */
		local->next_scan_state = SCAN_DECISION;
		return;
	}

	/*
	 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
	 * (which unfortunately doesn't say _why_ step a) is done,
	 * but it waits for the probe delay or until a frame is
	 * received - and the received frame would update the NAV).
	 * For now, we do not support waiting until a frame is
	 * received.
	 *
	 * In any case, it is not necessary for a passive scan.
	 */
	if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
			!scan_req->n_ssids) {
		*next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
		local->next_scan_state = SCAN_DECISION;
		return;
	}

	/* active scan, send probes */
	*next_delay = IEEE80211_PROBE_DELAY;
	local->next_scan_state = SCAN_SEND_PROBE;
}

void ieee80211_scan_state_suspend(struct ieee80211_local *local,
		unsigned long *next_delay)
{
	/* switch back to the operating channel */
	local->scan_chandef.chan = NULL;
	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);

	/* disable PS */
	ieee80211_offchannel_return(local);

	*next_delay = HZ / 5;
	/* afterwards, resume scan & go to next channel */
	local->next_scan_state = SCAN_RESUME;
}

void ieee80211_scan_state_resume(struct ieee80211_local *local,
		unsigned long *next_delay)
{
	ieee80211_offchannel_stop_vifs(local);

	if (local->ops->flush) {
		ieee80211_flush_queues(local, NULL, false);
		*next_delay = 0;
	} else
		*next_delay = HZ / 10;

	/* remember when we left the operating channel */
	local->leave_oper_channel_time = jiffies;

	/* advance to the next channel to be scanned */
	local->next_scan_state = SCAN_SET_CHANNEL;
}

void ieee80211_scan_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, scan_work.work);
	struct ieee80211_sub_if_data *sdata;
	struct cfg80211_scan_request *scan_req;
	unsigned long next_delay = 0;
	bool aborted;

	mutex_lock(&local->mtx);

	if (!ieee80211_can_run_worker(local)) {
		aborted = true;
		goto out_complete;
	}

	sdata = rcu_dereference_protected(local->scan_sdata,
			lockdep_is_held(&local->mtx));
	scan_req = rcu_dereference_protected(local->scan_req,
			lockdep_is_held(&local->mtx));

	/* When scanning on-channel, the first-callback means completed. */
	if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
		aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
		goto out_complete;
	}

	if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
		aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
		goto out_complete;
	}

	if (!sdata || !scan_req)
		goto out;

	if (!local->scanning) {
		int rc;

		RCU_INIT_POINTER(local->scan_req, NULL);
		RCU_INIT_POINTER(local->scan_sdata, NULL);

		rc = __ieee80211_start_scan(sdata, scan_req);
		if (rc) {
			/* need to complete scan in cfg80211 */
			rcu_assign_pointer(local->scan_req, scan_req);
			aborted = true;
			goto out_complete;
		} else
			goto out;
	}

	/*
	 * as long as no delay is required advance immediately
	 * without scheduling a new work
	 */
	do {
		if (!ieee80211_sdata_running(sdata)) {
			aborted = true;
			goto out_complete;
		}

		switch (local->next_scan_state) {
		case SCAN_DECISION:
			/* if no more bands/channels left, complete scan */
			if (local->scan_channel_idx >= scan_req->n_channels) {
				aborted = false;
				goto out_complete;
			}
			ieee80211_scan_state_decision(local, &next_delay);
			break;
		case SCAN_SET_CHANNEL:
			ieee80211_scan_state_set_channel(local, &next_delay);
			break;
		case SCAN_SEND_PROBE:
			ieee80211_scan_state_send_probe(local, &next_delay);
			break;
		case SCAN_SUSPEND:
			ieee80211_scan_state_suspend(local, &next_delay);
			break;
		case SCAN_RESUME:
			ieee80211_scan_state_resume(local, &next_delay);
			break;
		case SCAN_ABORT:
			aborted = true;
			goto out_complete;
		}
	} while (next_delay == 0);

	ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
	goto out;

out_complete:
	__ieee80211_scan_completed(&local->hw, aborted);
out:
	mutex_unlock(&local->mtx);
}

int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
		struct cfg80211_scan_request *req)
{
	int res;

	mutex_lock(&sdata->local->mtx);
	res = __ieee80211_start_scan(sdata, req);
	mutex_unlock(&sdata->local->mtx);

	return res;
}
int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
		const u8 *ssid, u8 ssid_len,
		struct ieee80211_channel **channels,
		unsigned int n_channels,
		enum nl80211_bss_scan_width scan_width)
{
	struct ieee80211_local *local = sdata->local;
	int ret = -EBUSY, i, n_ch = 0;
	enum nl80211_band band;

	mutex_lock(&local->mtx);

	/* busy scanning */
	if (local->scan_req)
		goto unlock;

	/* fill internal scan request */
	if (!channels) {
		int max_n;

		for (band = 0; band < NUM_NL80211_BANDS; band++) {
			if (!local->hw.wiphy->bands[band])
				continue;

			max_n = local->hw.wiphy->bands[band]->n_channels;
			for (i = 0; i < max_n; i++) {
				struct ieee80211_channel *tmp_ch =
					&local->hw.wiphy->bands[band]->channels[i];

				if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
							IEEE80211_CHAN_DISABLED))
					continue;

				local->int_scan_req->channels[n_ch] = tmp_ch;
				n_ch++;
			}
		}

		if (WARN_ON_ONCE(n_ch == 0))
			goto unlock;

		local->int_scan_req->n_channels = n_ch;
	} else {
		for (i = 0; i < n_channels; i++) {
			if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
						IEEE80211_CHAN_DISABLED))
				continue;

			local->int_scan_req->channels[n_ch] = channels[i];
			n_ch++;
		}

		if (WARN_ON_ONCE(n_ch == 0))
			goto unlock;

		local->int_scan_req->n_channels = n_ch;
	}

	local->int_scan_req->ssids = &local->scan_ssid;
	local->int_scan_req->n_ssids = 1;
	local->int_scan_req->scan_width = scan_width;
	memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
	local->int_scan_req->ssids[0].ssid_len = ssid_len;

	ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
unlock:
	mutex_unlock(&local->mtx);
	return ret;
}
/*
 * Only call this function when a scan can't be queued -- under RTNL.
 */
void ieee80211_scan_cancel(struct ieee80211_local *local)
{
	/*
	 * We are canceling software scan, or deferred scan that was not
	 * yet really started (see __ieee80211_start_scan ).
	 *
	 * Regarding hardware scan:
	 * - we can not call  __ieee80211_scan_completed() as when
	 *   SCAN_HW_SCANNING bit is set this function change
	 *   local->hw_scan_req to operate on 5G band, what race with
	 *   driver which can use local->hw_scan_req
	 *
	 * - we can not cancel scan_work since driver can schedule it
	 *   by ieee80211_scan_completed(..., true) to finish scan
	 *
	 * Hence we only call the cancel_hw_scan() callback, but the low-level
	 * driver is still responsible for calling ieee80211_scan_completed()
	 * after the scan was completed/aborted.
	 */

	mutex_lock(&local->mtx);
	if (!local->scan_req)
		goto out;

	/*
	 * We have a scan running and the driver already reported completion,
	 * but the worker hasn't run yet or is stuck on the mutex - mark it as
	 * cancelled.
	 */
	if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
			test_bit(SCAN_COMPLETED, &local->scanning)) {
		set_bit(SCAN_HW_CANCELLED, &local->scanning);
		goto out;
	}

	if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
		/*
		 * Make sure that __ieee80211_scan_completed doesn't trigger a
		 * scan on another band.
		 */
		set_bit(SCAN_HW_CANCELLED, &local->scanning);
		if (local->ops->cancel_hw_scan)
			drv_cancel_hw_scan(local,
					rcu_dereference_protected(local->scan_sdata,
						lockdep_is_held(&local->mtx)));
		goto out;
	}

	/*
	 * If the work is currently running, it must be blocked on
	 * the mutex, but we'll set scan_sdata = NULL and it'll
	 * simply exit once it acquires the mutex.
	 */
	cancel_delayed_work(&local->scan_work);
	/* and clean up */
	memset(&local->scan_info, 0, sizeof(local->scan_info));
	__ieee80211_scan_completed(&local->hw, true);
out:
	mutex_unlock(&local->mtx);
}