src/common/hw_features_common.c - vendor/opensource/hostap - Git at Google

 /*
  * Common hostapd/wpa_supplicant HW features
  * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
  * Copyright (c) 2015, Qualcomm Atheros, Inc.
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
  */

 #include "includes.h"

 #include "common.h"
 #include "defs.h"
 #include "ieee802_11_defs.h"
 #include "ieee802_11_common.h"
 #include "hw_features_common.h"


 struct hostapd_channel_data * hw_get_channel_chan(struct hostapd_hw_modes *mode,
 						  int chan, int *freq)
 {
 	int i;

 	if (freq)
 		*freq = 0;

 	if (!mode)
 		return NULL;

 	for (i = 0; i < mode->num_channels; i++) {
 		struct hostapd_channel_data *ch = &mode->channels[i];
 		if (ch->chan == chan) {
 			if (freq)
 				*freq = ch->freq;
 			return ch;
 		}
 	}

 	return NULL;
 }


 struct hostapd_channel_data * hw_get_channel_freq(struct hostapd_hw_modes *mode,
 						  int freq, int *chan)
 {
 	int i;

 	if (chan)
 		*chan = 0;

 	if (!mode)
 		return NULL;

 	for (i = 0; i < mode->num_channels; i++) {
 		struct hostapd_channel_data *ch = &mode->channels[i];
 		if (ch->freq == freq) {
 			if (chan)
 				*chan = ch->chan;
 			return ch;
 		}
 	}

 	return NULL;
 }


 int hw_get_freq(struct hostapd_hw_modes *mode, int chan)
 {
 	int freq;

 	hw_get_channel_chan(mode, chan, &freq);

 	return freq;
 }


 int hw_get_chan(struct hostapd_hw_modes *mode, int freq)
 {
 	int chan;

 	hw_get_channel_freq(mode, freq, &chan);

 	return chan;
 }


 int allowed_ht40_channel_pair(struct hostapd_hw_modes *mode, int pri_chan,
 			      int sec_chan)
 {
 	int ok, j, first;
 	int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 140,
 			  149, 157, 184, 192 };
 	size_t k;

 	if (pri_chan == sec_chan || !sec_chan)
 		return 1; /* HT40 not used */

 	wpa_printf(MSG_DEBUG,
 		   "HT40: control channel: %d  secondary channel: %d",
 		   pri_chan, sec_chan);

 	/* Verify that HT40 secondary channel is an allowed 20 MHz
 	 * channel */
 	ok = 0;
 	for (j = 0; j < mode->num_channels; j++) {
 		struct hostapd_channel_data *chan = &mode->channels[j];
 		if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
 		    chan->chan == sec_chan) {
 			ok = 1;
 			break;
 		}
 	}
 	if (!ok) {
 		wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
 			   sec_chan);
 		return 0;
 	}

 	/*
 	 * Verify that HT40 primary,secondary channel pair is allowed per
 	 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
 	 * 2.4 GHz rules allow all cases where the secondary channel fits into
 	 * the list of allowed channels (already checked above).
 	 */
 	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
 		return 1;

 	first = pri_chan < sec_chan ? pri_chan : sec_chan;

 	ok = 0;
 	for (k = 0; k < ARRAY_SIZE(allowed); k++) {
 		if (first == allowed[k]) {
 			ok = 1;
 			break;
 		}
 	}
 	if (!ok) {
 		wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
 			   pri_chan, sec_chan);
 		return 0;
 	}

 	return 1;
 }


 void get_pri_sec_chan(struct wpa_scan_res *bss, int *pri_chan, int *sec_chan)
 {
 	struct ieee80211_ht_operation *oper;
 	struct ieee802_11_elems elems;

 	*pri_chan = *sec_chan = 0;

 	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
 	if (elems.ht_operation) {
 		oper = (struct ieee80211_ht_operation *) elems.ht_operation;
 		*pri_chan = oper->primary_chan;
 		if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
 			int sec = oper->ht_param &
 				HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
 			if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
 				*sec_chan = *pri_chan + 4;
 			else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
 				*sec_chan = *pri_chan - 4;
 		}
 	}
 }


 int check_40mhz_5g(struct hostapd_hw_modes *mode,
 		   struct wpa_scan_results *scan_res, int pri_chan,
 		   int sec_chan)
 {
 	int pri_freq, sec_freq, pri_bss, sec_bss;
 	int bss_pri_chan, bss_sec_chan;
 	size_t i;
 	int match;

 	if (!mode || !scan_res || !pri_chan || !sec_chan)
 		return 0;

 	if (pri_chan == sec_chan)
 		return 0;

 	pri_freq = hw_get_freq(mode, pri_chan);
 	sec_freq = hw_get_freq(mode, sec_chan);

 	/*
 	 * Switch PRI/SEC channels if Beacons were detected on selected SEC
 	 * channel, but not on selected PRI channel.
 	 */
 	pri_bss = sec_bss = 0;
 	for (i = 0; i < scan_res->num; i++) {
 		struct wpa_scan_res *bss = scan_res->res[i];
 		if (bss->freq == pri_freq)
 			pri_bss++;
 		else if (bss->freq == sec_freq)
 			sec_bss++;
 	}
 	if (sec_bss && !pri_bss) {
 		wpa_printf(MSG_INFO,
 			   "Switch own primary and secondary channel to get secondary channel with no Beacons from other BSSes");
 		return 2;
 	}

 	/*
 	 * Match PRI/SEC channel with any existing HT40 BSS on the same
 	 * channels that we are about to use (if already mixed order in
 	 * existing BSSes, use own preference).
 	 */
 	match = 0;
 	for (i = 0; i < scan_res->num; i++) {
 		struct wpa_scan_res *bss = scan_res->res[i];
 		get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
 		if (pri_chan == bss_pri_chan &&
 		    sec_chan == bss_sec_chan) {
 			match = 1;
 			break;
 		}
 	}
 	if (!match) {
 		for (i = 0; i < scan_res->num; i++) {
 			struct wpa_scan_res *bss = scan_res->res[i];
 			get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
 			if (pri_chan == bss_sec_chan &&
 			    sec_chan == bss_pri_chan) {
 				wpa_printf(MSG_INFO, "Switch own primary and "
 					   "secondary channel due to BSS "
 					   "overlap with " MACSTR,
 					   MAC2STR(bss->bssid));
 				return 2;
 			}
 		}
 	}

 	return 1;
 }


 int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start, int end)
 {
 	struct ieee802_11_elems elems;
 	struct ieee80211_ht_operation *oper;

 	if (bss->freq < start || bss->freq > end || bss->freq == pri_freq)
 		return 0;

 	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
 	if (!elems.ht_capabilities) {
 		wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
 			   MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
 		return 1;
 	}

 	if (elems.ht_operation) {
 		oper = (struct ieee80211_ht_operation *) elems.ht_operation;
 		if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
 			return 0;

 		wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
 			   MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
 		return 1;
 	}
 	return 0;
 }


 int check_40mhz_2g4(struct hostapd_hw_modes *mode,
 		    struct wpa_scan_results *scan_res, int pri_chan,
 		    int sec_chan)
 {
 	int pri_freq, sec_freq;
 	int affected_start, affected_end;
 	size_t i;

 	if (!mode || !scan_res || !pri_chan || !sec_chan)
 		return 0;

 	if (pri_chan == sec_chan)
 		return 0;

 	pri_freq = hw_get_freq(mode, pri_chan);
 	sec_freq = hw_get_freq(mode, sec_chan);

 	affected_start = (pri_freq + sec_freq) / 2 - 25;
 	affected_end = (pri_freq + sec_freq) / 2 + 25;
 	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
 		   affected_start, affected_end);
 	for (i = 0; i < scan_res->num; i++) {
 		struct wpa_scan_res *bss = scan_res->res[i];
 		int pri = bss->freq;
 		int sec = pri;
 		struct ieee802_11_elems elems;

 		/* Check for overlapping 20 MHz BSS */
 		if (check_20mhz_bss(bss, pri_freq, affected_start,
 				    affected_end)) {
 			wpa_printf(MSG_DEBUG,
 				   "Overlapping 20 MHz BSS is found");
 			return 0;
 		}

 		get_pri_sec_chan(bss, &pri_chan, &sec_chan);

 		if (sec_chan) {
 			if (sec_chan < pri_chan)
 				sec = pri - 20;
 			else
 				sec = pri + 20;
 		}

 		if ((pri < affected_start || pri > affected_end) &&
 		    (sec < affected_start || sec > affected_end))
 			continue; /* not within affected channel range */

 		wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
 			   " freq=%d pri=%d sec=%d",
 			   MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);

 		if (sec_chan) {
 			if (pri_freq != pri || sec_freq != sec) {
 				wpa_printf(MSG_DEBUG,
 					   "40 MHz pri/sec mismatch with BSS "
 					   MACSTR
 					   " <%d,%d> (chan=%d%c) vs. <%d,%d>",
 					   MAC2STR(bss->bssid),
 					   pri, sec, pri_chan,
 					   sec > pri ? '+' : '-',
 					   pri_freq, sec_freq);
 				return 0;
 			}
 		}

 		ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
 				       0);
 		if (elems.ht_capabilities) {
 			struct ieee80211_ht_capabilities *ht_cap =
 				(struct ieee80211_ht_capabilities *)
 				elems.ht_capabilities;

 			if (le_to_host16(ht_cap->ht_capabilities_info) &
 			    HT_CAP_INFO_40MHZ_INTOLERANT) {
 				wpa_printf(MSG_DEBUG,
 					   "40 MHz Intolerant is set on channel %d in BSS "
 					   MACSTR, pri, MAC2STR(bss->bssid));
 				return 0;
 			}
 		}
 	}

 	return 1;
 }


 int hostapd_set_freq_params(struct hostapd_freq_params *data,
 			    enum hostapd_hw_mode mode,
 			    int freq, int channel, int ht_enabled,
 			    int vht_enabled, int sec_channel_offset,
 			    int vht_oper_chwidth, int center_segment0,
 			    int center_segment1, u32 vht_caps)
 {
 	os_memset(data, 0, sizeof(*data));
 	data->mode = mode;
 	data->freq = freq;
 	data->channel = channel;
 	data->ht_enabled = ht_enabled;
 	data->vht_enabled = vht_enabled;
 	data->sec_channel_offset = sec_channel_offset;
 	data->center_freq1 = freq + sec_channel_offset * 10;
 	data->center_freq2 = 0;
 	data->bandwidth = sec_channel_offset ? 40 : 20;

 	if (data->vht_enabled) switch (vht_oper_chwidth) {
 	case VHT_CHANWIDTH_USE_HT:
 		if (center_segment1)
 			return -1;
 		if (center_segment0 != 0 &&
 		    5000 + center_segment0 * 5 != data->center_freq1 &&
 		    2407 + center_segment0 * 5 != data->center_freq1)
 			return -1;
 		break;
 	case VHT_CHANWIDTH_80P80MHZ:
 		if (!(vht_caps & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) {
 			wpa_printf(MSG_ERROR,
 				   "80+80 channel width is not supported!");
 			return -1;
 		}
 		if (center_segment1 == center_segment0 + 4 ||
 		    center_segment1 == center_segment0 - 4)
 			return -1;
 		data->center_freq2 = 5000 + center_segment1 * 5;
 		/* fall through */
 	case VHT_CHANWIDTH_80MHZ:
 		data->bandwidth = 80;
 		if (vht_oper_chwidth == 1 && center_segment1)
 			return -1;
 		if (vht_oper_chwidth == 3 && !center_segment1)
 			return -1;
 		if (!sec_channel_offset)
 			return -1;
 		if (!center_segment0) {
 			if (channel <= 48)
 				center_segment0 = 42;
 			else if (channel <= 64)
 				center_segment0 = 58;
 			else if (channel <= 112)
 				center_segment0 = 106;
 			else if (channel <= 128)
 				center_segment0 = 122;
 			else if (channel <= 144)
 				center_segment0 = 138;
 			else if (channel <= 161)
 				center_segment0 = 155;
 			data->center_freq1 = 5000 + center_segment0 * 5;
 		} else {
 			/*
 			 * Note: HT/VHT config and params are coupled. Check if
 			 * HT40 channel band is in VHT80 Pri channel band
 			 * configuration.
 			 */
 			if (center_segment0 == channel + 6 ||
 			    center_segment0 == channel + 2 ||
 			    center_segment0 == channel - 2 ||
 			    center_segment0 == channel - 6)
 				data->center_freq1 = 5000 + center_segment0 * 5;
 			else
 				return -1;
 		}
 		break;
 	case VHT_CHANWIDTH_160MHZ:
 		data->bandwidth = 160;
 		if (!(vht_caps & (VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
 				  VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
 			wpa_printf(MSG_ERROR,
 				   "160MHZ channel width is not supported!");
 			return -1;
 		}
 		if (center_segment1)
 			return -1;
 		if (!sec_channel_offset)
 			return -1;
 		/*
 		 * Note: HT/VHT config and params are coupled. Check if
 		 * HT40 channel band is in VHT160 channel band configuration.
 		 */
 		if (center_segment0 == channel + 14 ||
 		    center_segment0 == channel + 10 ||
 		    center_segment0 == channel + 6 ||
 		    center_segment0 == channel + 2 ||
 		    center_segment0 == channel - 2 ||
 		    center_segment0 == channel - 6 ||
 		    center_segment0 == channel - 10 ||
 		    center_segment0 == channel - 14)
 			data->center_freq1 = 5000 + center_segment0 * 5;
 		else
 			return -1;
 		break;
 	}

 	return 0;
 }
	/*
	* Common hostapd/wpa_supplicant HW features
	* Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
	* Copyright (c) 2015, Qualcomm Atheros, Inc.
	*
	* This software may be distributed under the terms of the BSD license.
	* See README for more details.
	*/

	#include "includes.h"

	#include "common.h"
	#include "defs.h"
	#include "ieee802_11_defs.h"
	#include "ieee802_11_common.h"
	#include "hw_features_common.h"


	struct hostapd_channel_data * hw_get_channel_chan(struct hostapd_hw_modes *mode,
	int chan, int *freq)
	{
	int i;

	if (freq)
	*freq = 0;

	if (!mode)
	return NULL;

	for (i = 0; i < mode->num_channels; i++) {
	struct hostapd_channel_data *ch = &mode->channels[i];
	if (ch->chan == chan) {
	if (freq)
	*freq = ch->freq;
	return ch;
	}
	}

	return NULL;
	}


	struct hostapd_channel_data * hw_get_channel_freq(struct hostapd_hw_modes *mode,
	int freq, int *chan)
	{
	int i;

	if (chan)
	*chan = 0;

	if (!mode)
	return NULL;

	for (i = 0; i < mode->num_channels; i++) {
	struct hostapd_channel_data *ch = &mode->channels[i];
	if (ch->freq == freq) {
	if (chan)
	*chan = ch->chan;
	return ch;
	}
	}

	return NULL;
	}


	int hw_get_freq(struct hostapd_hw_modes *mode, int chan)
	{
	int freq;

	hw_get_channel_chan(mode, chan, &freq);

	return freq;
	}


	int hw_get_chan(struct hostapd_hw_modes *mode, int freq)
	{
	int chan;

	hw_get_channel_freq(mode, freq, &chan);

	return chan;
	}


	int allowed_ht40_channel_pair(struct hostapd_hw_modes *mode, int pri_chan,
	int sec_chan)
	{
	int ok, j, first;
	int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 140,
	149, 157, 184, 192 };
	size_t k;

	if (pri_chan == sec_chan \|\| !sec_chan)
	return 1; /* HT40 not used */

	wpa_printf(MSG_DEBUG,
	"HT40: control channel: %d secondary channel: %d",
	pri_chan, sec_chan);

	/* Verify that HT40 secondary channel is an allowed 20 MHz
	* channel */
	ok = 0;
	for (j = 0; j < mode->num_channels; j++) {
	struct hostapd_channel_data *chan = &mode->channels[j];
	if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
	chan->chan == sec_chan) {
	ok = 1;
	break;
	}
	}
	if (!ok) {
	wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
	sec_chan);
	return 0;
	}

	/*
	* Verify that HT40 primary,secondary channel pair is allowed per
	* IEEE 802.11n Annex J. This is only needed for 5 GHz band since
	* 2.4 GHz rules allow all cases where the secondary channel fits into
	* the list of allowed channels (already checked above).
	*/
	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
	return 1;

	first = pri_chan < sec_chan ? pri_chan : sec_chan;

	ok = 0;
	for (k = 0; k < ARRAY_SIZE(allowed); k++) {
	if (first == allowed[k]) {
	ok = 1;
	break;
	}
	}
	if (!ok) {
	wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
	pri_chan, sec_chan);
	return 0;
	}

	return 1;
	}


	void get_pri_sec_chan(struct wpa_scan_res bss, int pri_chan, int *sec_chan)
	{
	struct ieee80211_ht_operation *oper;
	struct ieee802_11_elems elems;

	pri_chan = sec_chan = 0;

	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
	if (elems.ht_operation) {
	oper = (struct ieee80211_ht_operation *) elems.ht_operation;
	*pri_chan = oper->primary_chan;
	if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
	int sec = oper->ht_param &
	HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
	if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
	sec_chan = pri_chan + 4;
	else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
	sec_chan = pri_chan - 4;
	}
	}
	}


	int check_40mhz_5g(struct hostapd_hw_modes *mode,
	struct wpa_scan_results *scan_res, int pri_chan,
	int sec_chan)
	{
	int pri_freq, sec_freq, pri_bss, sec_bss;
	int bss_pri_chan, bss_sec_chan;
	size_t i;
	int match;

	if (!mode \|\| !scan_res \|\| !pri_chan \|\| !sec_chan)
	return 0;

	if (pri_chan == sec_chan)
	return 0;

	pri_freq = hw_get_freq(mode, pri_chan);
	sec_freq = hw_get_freq(mode, sec_chan);

	/*
	* Switch PRI/SEC channels if Beacons were detected on selected SEC
	* channel, but not on selected PRI channel.
	*/
	pri_bss = sec_bss = 0;
	for (i = 0; i < scan_res->num; i++) {
	struct wpa_scan_res *bss = scan_res->res[i];
	if (bss->freq == pri_freq)
	pri_bss++;
	else if (bss->freq == sec_freq)
	sec_bss++;
	}
	if (sec_bss && !pri_bss) {
	wpa_printf(MSG_INFO,
	"Switch own primary and secondary channel to get secondary channel with no Beacons from other BSSes");
	return 2;
	}

	/*
	* Match PRI/SEC channel with any existing HT40 BSS on the same
	* channels that we are about to use (if already mixed order in
	* existing BSSes, use own preference).
	*/
	match = 0;
	for (i = 0; i < scan_res->num; i++) {
	struct wpa_scan_res *bss = scan_res->res[i];
	get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
	if (pri_chan == bss_pri_chan &&
	sec_chan == bss_sec_chan) {
	match = 1;
	break;
	}
	}
	if (!match) {
	for (i = 0; i < scan_res->num; i++) {
	struct wpa_scan_res *bss = scan_res->res[i];
	get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
	if (pri_chan == bss_sec_chan &&
	sec_chan == bss_pri_chan) {
	wpa_printf(MSG_INFO, "Switch own primary and "
	"secondary channel due to BSS "
	"overlap with " MACSTR,
	MAC2STR(bss->bssid));
	return 2;
	}
	}
	}

	return 1;
	}


	int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start, int end)
	{
	struct ieee802_11_elems elems;
	struct ieee80211_ht_operation *oper;

	if (bss->freq < start \|\| bss->freq > end \|\| bss->freq == pri_freq)
	return 0;

	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
	if (!elems.ht_capabilities) {
	wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
	MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
	return 1;
	}

	if (elems.ht_operation) {
	oper = (struct ieee80211_ht_operation *) elems.ht_operation;
	if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
	return 0;

	wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
	MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
	return 1;
	}
	return 0;
	}


	int check_40mhz_2g4(struct hostapd_hw_modes *mode,
	struct wpa_scan_results *scan_res, int pri_chan,
	int sec_chan)
	{
	int pri_freq, sec_freq;
	int affected_start, affected_end;
	size_t i;

	if (!mode \|\| !scan_res \|\| !pri_chan \|\| !sec_chan)
	return 0;

	if (pri_chan == sec_chan)
	return 0;

	pri_freq = hw_get_freq(mode, pri_chan);
	sec_freq = hw_get_freq(mode, sec_chan);

	affected_start = (pri_freq + sec_freq) / 2 - 25;
	affected_end = (pri_freq + sec_freq) / 2 + 25;
	wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
	affected_start, affected_end);
	for (i = 0; i < scan_res->num; i++) {
	struct wpa_scan_res *bss = scan_res->res[i];
	int pri = bss->freq;
	int sec = pri;
	struct ieee802_11_elems elems;

	/* Check for overlapping 20 MHz BSS */
	if (check_20mhz_bss(bss, pri_freq, affected_start,
	affected_end)) {
	wpa_printf(MSG_DEBUG,
	"Overlapping 20 MHz BSS is found");
	return 0;
	}

	get_pri_sec_chan(bss, &pri_chan, &sec_chan);

	if (sec_chan) {
	if (sec_chan < pri_chan)
	sec = pri - 20;
	else
	sec = pri + 20;
	}

	if ((pri < affected_start \|\| pri > affected_end) &&
	(sec < affected_start \|\| sec > affected_end))
	continue; /* not within affected channel range */

	wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
	" freq=%d pri=%d sec=%d",
	MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);

	if (sec_chan) {
	if (pri_freq != pri \|\| sec_freq != sec) {
	wpa_printf(MSG_DEBUG,
	"40 MHz pri/sec mismatch with BSS "
	MACSTR
	" <%d,%d> (chan=%d%c) vs. <%d,%d>",
	MAC2STR(bss->bssid),
	pri, sec, pri_chan,
	sec > pri ? '+' : '-',
	pri_freq, sec_freq);
	return 0;
	}
	}

	ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
	0);
	if (elems.ht_capabilities) {
	struct ieee80211_ht_capabilities *ht_cap =
	(struct ieee80211_ht_capabilities *)
	elems.ht_capabilities;

	if (le_to_host16(ht_cap->ht_capabilities_info) &
	HT_CAP_INFO_40MHZ_INTOLERANT) {
	wpa_printf(MSG_DEBUG,
	"40 MHz Intolerant is set on channel %d in BSS "
	MACSTR, pri, MAC2STR(bss->bssid));
	return 0;
	}
	}
	}

	return 1;
	}


	int hostapd_set_freq_params(struct hostapd_freq_params *data,
	enum hostapd_hw_mode mode,
	int freq, int channel, int ht_enabled,
	int vht_enabled, int sec_channel_offset,
	int vht_oper_chwidth, int center_segment0,
	int center_segment1, u32 vht_caps)
	{
	os_memset(data, 0, sizeof(*data));
	data->mode = mode;
	data->freq = freq;
	data->channel = channel;
	data->ht_enabled = ht_enabled;
	data->vht_enabled = vht_enabled;
	data->sec_channel_offset = sec_channel_offset;
	data->center_freq1 = freq + sec_channel_offset * 10;
	data->center_freq2 = 0;
	data->bandwidth = sec_channel_offset ? 40 : 20;

	if (data->vht_enabled) switch (vht_oper_chwidth) {
	case VHT_CHANWIDTH_USE_HT:
	if (center_segment1)
	return -1;
	if (center_segment0 != 0 &&
	5000 + center_segment0 * 5 != data->center_freq1 &&
	2407 + center_segment0 * 5 != data->center_freq1)
	return -1;
	break;
	case VHT_CHANWIDTH_80P80MHZ:
	if (!(vht_caps & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) {
	wpa_printf(MSG_ERROR,
	"80+80 channel width is not supported!");
	return -1;
	}
	if (center_segment1 == center_segment0 + 4 \|\|
	center_segment1 == center_segment0 - 4)
	return -1;
	data->center_freq2 = 5000 + center_segment1 * 5;
	/* fall through */
	case VHT_CHANWIDTH_80MHZ:
	data->bandwidth = 80;
	if (vht_oper_chwidth == 1 && center_segment1)
	return -1;
	if (vht_oper_chwidth == 3 && !center_segment1)
	return -1;
	if (!sec_channel_offset)
	return -1;
	if (!center_segment0) {
	if (channel <= 48)
	center_segment0 = 42;
	else if (channel <= 64)
	center_segment0 = 58;
	else if (channel <= 112)
	center_segment0 = 106;
	else if (channel <= 128)
	center_segment0 = 122;
	else if (channel <= 144)
	center_segment0 = 138;
	else if (channel <= 161)
	center_segment0 = 155;
	data->center_freq1 = 5000 + center_segment0 * 5;
	} else {
	/*
	* Note: HT/VHT config and params are coupled. Check if
	* HT40 channel band is in VHT80 Pri channel band
	* configuration.
	*/
	if (center_segment0 == channel + 6 \|\|
	center_segment0 == channel + 2 \|\|
	center_segment0 == channel - 2 \|\|
	center_segment0 == channel - 6)
	data->center_freq1 = 5000 + center_segment0 * 5;
	else
	return -1;
	}
	break;
	case VHT_CHANWIDTH_160MHZ:
	data->bandwidth = 160;
	if (!(vht_caps & (VHT_CAP_SUPP_CHAN_WIDTH_160MHZ \|
	VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
	wpa_printf(MSG_ERROR,
	"160MHZ channel width is not supported!");
	return -1;
	}
	if (center_segment1)
	return -1;
	if (!sec_channel_offset)
	return -1;
	/*
	* Note: HT/VHT config and params are coupled. Check if
	* HT40 channel band is in VHT160 channel band configuration.
	*/
	if (center_segment0 == channel + 14 \|\|
	center_segment0 == channel + 10 \|\|
	center_segment0 == channel + 6 \|\|
	center_segment0 == channel + 2 \|\|
	center_segment0 == channel - 2 \|\|
	center_segment0 == channel - 6 \|\|
	center_segment0 == channel - 10 \|\|
	center_segment0 == channel - 14)
	data->center_freq1 = 5000 + center_segment0 * 5;
	else
	return -1;
	break;
	}

	return 0;
	}