wpa_supplicant/op_classes.c - LeafOS-Project/android_external_wpa_supplicant_8 - Gitiles

 /*
  * Operating classes
  * Copyright(c) 2015 Intel Deutschland GmbH
  * Contact Information:
  * Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
  */

 #include "utils/includes.h"

 #include "utils/common.h"
 #include "common/ieee802_11_common.h"
 #include "wpa_supplicant_i.h"
 #include "bss.h"


 static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode,
 				       u8 op_class, u8 chan,
 				       unsigned int *flags)
 {
 	int i;
 	bool is_6ghz = op_class >= 131 && op_class <= 136;

 	for (i = 0; i < mode->num_channels; i++) {
 		bool chan_is_6ghz;

 		chan_is_6ghz = mode->channels[i].freq >= 5935 &&
 			mode->channels[i].freq <= 7115;
 		if (is_6ghz == chan_is_6ghz && mode->channels[i].chan == chan)
 			break;
 	}

 	if (i == mode->num_channels ||
 	    (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
 		return NOT_ALLOWED;

 	if (flags)
 		*flags = mode->channels[i].flag;

 	if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
 		return NO_IR;

 	return ALLOWED;
 }


 static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel,
 			    const u8 *center_channels, size_t num_chan)
 {
 	size_t i;

 	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
 		return 0;

 	for (i = 0; i < num_chan; i++) {
 		/*
 		 * In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
 		 * so the center channel is 6 channels away from the start/end.
 		 */
 		if (channel >= center_channels[i] - 6 &&
 		    channel <= center_channels[i] + 6)
 			return center_channels[i];
 	}

 	return 0;
 }


 static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode,
 				      u8 op_class, u8 channel)
 {
 	u8 center_chan;
 	unsigned int i;
 	unsigned int no_ir = 0;
 	const u8 *center_channels;
 	size_t num_chan;
 	const u8 center_channels_5ghz[] = { 42, 58, 106, 122, 138, 155, 171 };
 	const u8 center_channels_6ghz[] = { 7, 23, 39, 55, 71, 87, 103, 119,
 					    135, 151, 167, 183, 199, 215 };

 	if (is_6ghz_op_class(op_class)) {
 		center_channels = center_channels_6ghz;
 		num_chan = ARRAY_SIZE(center_channels_6ghz);
 	} else {
 		center_channels = center_channels_5ghz;
 		num_chan = ARRAY_SIZE(center_channels_5ghz);
 	}

 	center_chan = get_center_80mhz(mode, channel, center_channels,
 				       num_chan);
 	if (!center_chan)
 		return NOT_ALLOWED;

 	/* check all the channels are available */
 	for (i = 0; i < 4; i++) {
 		unsigned int flags;
 		u8 adj_chan = center_chan - 6 + i * 4;

 		if (allow_channel(mode, op_class, adj_chan, &flags) ==
 		    NOT_ALLOWED)
 			return NOT_ALLOWED;

 		if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL))
 			return NOT_ALLOWED;

 		if (flags & HOSTAPD_CHAN_NO_IR)
 			no_ir = 1;
 	}

 	if (no_ir)
 		return NO_IR;

 	return ALLOWED;
 }


 static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel,
 			     const u8 *center_channels, size_t num_chan)
 {
 	unsigned int i;

 	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
 		return 0;

 	for (i = 0; i < num_chan; i++) {
 		/*
 		 * In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
 		 * so the center channel is 14 channels away from the start/end.
 		 */
 		if (channel >= center_channels[i] - 14 &&
 		    channel <= center_channels[i] + 14)
 			return center_channels[i];
 	}

 	return 0;
 }


 static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
 				       u8 op_class, u8 channel)
 {
 	u8 center_chan;
 	unsigned int i;
 	unsigned int no_ir = 0;
 	const u8 *center_channels;
 	size_t num_chan;
 	const u8 center_channels_5ghz[] = { 50, 114, 163 };
 	const u8 center_channels_6ghz[] = { 15, 47, 79, 111, 143, 175, 207 };

 	if (is_6ghz_op_class(op_class)) {
 		center_channels = center_channels_6ghz;
 		num_chan = ARRAY_SIZE(center_channels_6ghz);
 	} else {
 		center_channels = center_channels_5ghz;
 		num_chan = ARRAY_SIZE(center_channels_5ghz);
 	}

 	center_chan = get_center_160mhz(mode, channel, center_channels,
 					num_chan);
 	if (!center_chan)
 		return NOT_ALLOWED;

 	/* Check all the channels are available */
 	for (i = 0; i < 8; i++) {
 		unsigned int flags;
 		u8 adj_chan = center_chan - 14 + i * 4;

 		if (allow_channel(mode, op_class, adj_chan, &flags) ==
 		    NOT_ALLOWED)
 			return NOT_ALLOWED;

 		if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL) ||
 		    !(flags & HOSTAPD_CHAN_VHT_160MHZ_SUBCHANNEL))
 			return NOT_ALLOWED;

 		if (flags & HOSTAPD_CHAN_NO_IR)
 			no_ir = 1;
 	}

 	if (no_ir)
 		return NO_IR;

 	return ALLOWED;
 }


 enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 op_class,
 				 u8 channel, u8 bw)
 {
 	unsigned int flag = 0;
 	enum chan_allowed res, res2;

 	res2 = res = allow_channel(mode, op_class, channel, &flag);
 	if (bw == BW40MINUS || (bw == BW40 && (((channel - 1) / 4) % 2))) {
 		if (!(flag & HOSTAPD_CHAN_HT40MINUS))
 			return NOT_ALLOWED;
 		res2 = allow_channel(mode, op_class, channel - 4, NULL);
 	} else if (bw == BW40PLUS) {
 		if (!(flag & HOSTAPD_CHAN_HT40PLUS))
 			return NOT_ALLOWED;
 		res2 = allow_channel(mode, op_class, channel + 4, NULL);
 	} else if (is_6ghz_op_class(op_class) && bw == BW40) {
 		if (get_6ghz_sec_channel(channel) < 0)
 			res2 = allow_channel(mode, op_class, channel - 4, NULL);
 		else
 			res2 = allow_channel(mode, op_class, channel + 4, NULL);
 	} else if (bw == BW80) {
 		/*
 		 * channel is a center channel and as such, not necessarily a
 		 * valid 20 MHz channels. Override earlier allow_channel()
 		 * result and use only the 80 MHz specific version.
 		 */
 		res2 = res = verify_80mhz(mode, op_class, channel);
 	} else if (bw == BW160) {
 		/*
 		 * channel is a center channel and as such, not necessarily a
 		 * valid 20 MHz channels. Override earlier allow_channel()
 		 * result and use only the 160 MHz specific version.
 		 */
 		res2 = res = verify_160mhz(mode, op_class, channel);
 	} else if (bw == BW80P80) {
 		/*
 		 * channel is a center channel and as such, not necessarily a
 		 * valid 20 MHz channels. Override earlier allow_channel()
 		 * result and use only the 80 MHz specific version.
 		 */
 		res2 = res = verify_80mhz(mode, op_class, channel);
 	}

 	if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
 		return NOT_ALLOWED;

 	if (res == NO_IR || res2 == NO_IR)
 		return NO_IR;

 	return ALLOWED;
 }


 static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
 				   struct wpa_ssid *ssid,
 				   const struct oper_class_map *op_class)
 {
 	int chan;
 	size_t i;
 	struct hostapd_hw_modes *mode;
 	int found;
 	int z;
 	int freq2 = 0;
 	int freq5 = 0;

 	mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode,
 			is_6ghz_op_class(op_class->op_class));
 	if (!mode)
 		return 0;

 	/* If we are configured to disable certain things, take that into
 	 * account here. */
 	if (ssid && ssid->freq_list && ssid->freq_list[0]) {
 		for (z = 0; ; z++) {
 			int f = ssid->freq_list[z];

 			if (f == 0)
 				break; /* end of list */
 			if (f > 4000 && f < 6000)
 				freq5 = 1;
 			else if (f > 2400 && f < 2500)
 				freq2 = 1;
 		}
 	} else {
 		/* No frequencies specified, can use anything hardware supports.
 		 */
 		freq2 = freq5 = 1;
 	}

 	if (op_class->op_class >= 115 && op_class->op_class <= 130 && !freq5)
 		return 0;
 	if (op_class->op_class >= 81 && op_class->op_class <= 84 && !freq2)
 		return 0;

 #ifdef CONFIG_HT_OVERRIDES
 	if (ssid && ssid->disable_ht) {
 		switch (op_class->op_class) {
 		case 83:
 		case 84:
 		case 104:
 		case 105:
 		case 116:
 		case 117:
 		case 119:
 		case 120:
 		case 122:
 		case 123:
 		case 126:
 		case 127:
 		case 128:
 		case 129:
 		case 130:
 			/* Disable >= 40 MHz channels if HT is disabled */
 			return 0;
 		}
 	}
 #endif /* CONFIG_HT_OVERRIDES */

 #ifdef CONFIG_VHT_OVERRIDES
 	if (ssid && ssid->disable_vht) {
 		if (op_class->op_class >= 128 && op_class->op_class <= 130) {
 			/* Disable >= 80 MHz channels if VHT is disabled */
 			return 0;
 		}
 	}
 #endif /* CONFIG_VHT_OVERRIDES */

 	if (op_class->op_class == 128) {
 		u8 channels[] = { 42, 58, 106, 122, 138, 155, 171 };

 		for (i = 0; i < ARRAY_SIZE(channels); i++) {
 			if (verify_channel(mode, op_class->op_class,
 					   channels[i], op_class->bw) !=
 			    NOT_ALLOWED)
 				return 1;
 		}

 		return 0;
 	}

 	if (op_class->op_class == 129) {
 		/* Check if either 160 MHz channels is allowed */
 		return verify_channel(mode, op_class->op_class, 50,
 				      op_class->bw) != NOT_ALLOWED ||
 			verify_channel(mode, op_class->op_class, 114,
 				       op_class->bw) != NOT_ALLOWED ||
 			verify_channel(mode, op_class->op_class, 163,
 				       op_class->bw) != NOT_ALLOWED;
 	}

 	if (op_class->op_class == 130) {
 		/* Need at least two non-contiguous 80 MHz segments */
 		found = 0;

 		if (verify_channel(mode, op_class->op_class, 42,
 				   op_class->bw) != NOT_ALLOWED ||
 		    verify_channel(mode, op_class->op_class, 58,
 				   op_class->bw) != NOT_ALLOWED)
 			found++;
 		if (verify_channel(mode, op_class->op_class, 106,
 				   op_class->bw) != NOT_ALLOWED ||
 		    verify_channel(mode, op_class->op_class, 122,
 				   op_class->bw) != NOT_ALLOWED ||
 		    verify_channel(mode, op_class->op_class, 138,
 				   op_class->bw) != NOT_ALLOWED ||
 		    verify_channel(mode, op_class->op_class, 155,
 				   op_class->bw) != NOT_ALLOWED ||
 		    verify_channel(mode, op_class->op_class, 171,
 				   op_class->bw) != NOT_ALLOWED)
 			found++;
 		if (verify_channel(mode, op_class->op_class, 106,
 				   op_class->bw) != NOT_ALLOWED &&
 		    verify_channel(mode, op_class->op_class, 138,
 				   op_class->bw) != NOT_ALLOWED)
 			found++;
 		if (verify_channel(mode, op_class->op_class, 122,
 				   op_class->bw) != NOT_ALLOWED &&
 		    verify_channel(mode, op_class->op_class, 155,
 				   op_class->bw) != NOT_ALLOWED)
 			found++;
 		if (verify_channel(mode, op_class->op_class, 138,
 				   op_class->bw) != NOT_ALLOWED &&
 		    verify_channel(mode, op_class->op_class, 171,
 				   op_class->bw) != NOT_ALLOWED)
 			found++;

 		if (found >= 2)
 			return 1;

 		return 0;
 	}

 	if (op_class->op_class == 135) {
 		/* Need at least two 80 MHz segments which do not fall under the
 		 * same 160 MHz segment to support 80+80 in 6 GHz.
 		 */
 		int first_seg = 0;
 		int curr_seg = 0;

 		for (chan = op_class->min_chan; chan <= op_class->max_chan;
 		     chan += op_class->inc) {
 			curr_seg++;
 			if (verify_channel(mode, op_class->op_class, chan,
 					   op_class->bw) != NOT_ALLOWED) {
 				if (!first_seg) {
 					first_seg = curr_seg;
 					continue;
 				}

 				/* Supported if at least two non-consecutive 80
 				 * MHz segments allowed.
 				 */
 				if ((curr_seg - first_seg) > 1)
 					return 1;

 				/* Supported even if the 80 MHz segments are
 				 * consecutive when they do not fall under the
 				 * same 160 MHz segment.
 				 */
 				if ((first_seg % 2) == 0)
 					return 1;
 			}
 		}

 		return 0;
 	}

 	found = 0;
 	for (chan = op_class->min_chan; chan <= op_class->max_chan;
 	     chan += op_class->inc) {
 		if (verify_channel(mode, op_class->op_class, chan,
 				   op_class->bw) != NOT_ALLOWED) {
 			found = 1;
 			break;
 		}
 	}

 	return found;
 }


 static int wpas_sta_secondary_channel_offset(struct wpa_bss *bss, u8 *current,
 					     u8 *channel)
 {

 	const u8 *ies;
 	u8 phy_type;
 	size_t ies_len;

 	if (!bss)
 		return -1;
 	ies = wpa_bss_ie_ptr(bss);
 	ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
 	return wpas_get_op_chan_phy(bss->freq, ies, ies_len, current,
 				    channel, &phy_type);
 }


 size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s,
 			     struct wpa_ssid *ssid,
 			     struct wpa_bss *bss, u8 *pos, size_t len)
 {
 	struct wpabuf *buf;
 	u8 op, current, chan;
 	u8 *ie_len;
 	size_t res;

 	/*
 	 * Determine the current operating class correct mode based on
 	 * advertised BSS capabilities, if available. Fall back to a less
 	 * accurate guess based on frequency if the needed IEs are not available
 	 * or used.
 	 */
 	if (wpas_sta_secondary_channel_offset(bss, &current, &chan) < 0 &&
 	    ieee80211_freq_to_channel_ext(bss->freq, 0,
 					  CONF_OPER_CHWIDTH_USE_HT, &current,
 					  &chan) == NUM_HOSTAPD_MODES)
 		return 0;

 	/*
 	 * Need 3 bytes for EID, length, and current operating class, plus
 	 * 1 byte for every other supported operating class.
 	 */
 	buf = wpabuf_alloc(global_op_class_size + 3);
 	if (!buf)
 		return 0;

 	wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
 	/* Will set the length later, putting a placeholder */
 	ie_len = wpabuf_put(buf, 1);
 	wpabuf_put_u8(buf, current);

 	for (op = 0; global_op_class[op].op_class; op++) {
 		if (wpas_op_class_supported(wpa_s, ssid, &global_op_class[op]))
 			wpabuf_put_u8(buf, global_op_class[op].op_class);
 	}

 	*ie_len = wpabuf_len(buf) - 2;
 	if (*ie_len < 2) {
 		wpa_printf(MSG_DEBUG,
 			   "No supported operating classes IE to add");
 		res = 0;
 	} else if (wpabuf_len(buf) > len) {
 		wpa_printf(MSG_ERROR,
 			   "Supported operating classes IE exceeds maximum buffer length");
 		res = 0;
 	} else {
 		os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
 		res = wpabuf_len(buf);
 		wpa_hexdump_buf(MSG_DEBUG,
 				"Added supported operating classes IE", buf);
 	}

 	wpabuf_free(buf);
 	return res;
 }


 int * wpas_supp_op_classes(struct wpa_supplicant *wpa_s)
 {
 	int op;
 	unsigned int pos, max_num = 0;
 	int *classes;

 	for (op = 0; global_op_class[op].op_class; op++)
 		max_num++;
 	classes = os_zalloc((max_num + 1) * sizeof(int));
 	if (!classes)
 		return NULL;

 	for (op = 0, pos = 0; global_op_class[op].op_class; op++) {
 		if (wpas_op_class_supported(wpa_s, NULL, &global_op_class[op]))
 			classes[pos++] = global_op_class[op].op_class;
 	}

 	return classes;
 }
	/*
	* Operating classes
	* Copyright(c) 2015 Intel Deutschland GmbH
	* Contact Information:
	* Intel Linux Wireless <ilw@linux.intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	* This software may be distributed under the terms of the BSD license.
	* See README for more details.
	*/

	#include "utils/includes.h"

	#include "utils/common.h"
	#include "common/ieee802_11_common.h"
	#include "wpa_supplicant_i.h"
	#include "bss.h"


	static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode,
	u8 op_class, u8 chan,
	unsigned int *flags)
	{
	int i;
	bool is_6ghz = op_class >= 131 && op_class <= 136;

	for (i = 0; i < mode->num_channels; i++) {
	bool chan_is_6ghz;

	chan_is_6ghz = mode->channels[i].freq >= 5935 &&
	mode->channels[i].freq <= 7115;
	if (is_6ghz == chan_is_6ghz && mode->channels[i].chan == chan)
	break;
	}

	if (i == mode->num_channels \|\|
	(mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
	return NOT_ALLOWED;

	if (flags)
	*flags = mode->channels[i].flag;

	if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
	return NO_IR;

	return ALLOWED;
	}


	static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel,
	const u8 *center_channels, size_t num_chan)
	{
	size_t i;

	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
	return 0;

	for (i = 0; i < num_chan; i++) {
	/*
	* In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
	* so the center channel is 6 channels away from the start/end.
	*/
	if (channel >= center_channels[i] - 6 &&
	channel <= center_channels[i] + 6)
	return center_channels[i];
	}

	return 0;
	}


	static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode,
	u8 op_class, u8 channel)
	{
	u8 center_chan;
	unsigned int i;
	unsigned int no_ir = 0;
	const u8 *center_channels;
	size_t num_chan;
	const u8 center_channels_5ghz[] = { 42, 58, 106, 122, 138, 155, 171 };
	const u8 center_channels_6ghz[] = { 7, 23, 39, 55, 71, 87, 103, 119,
	135, 151, 167, 183, 199, 215 };

	if (is_6ghz_op_class(op_class)) {
	center_channels = center_channels_6ghz;
	num_chan = ARRAY_SIZE(center_channels_6ghz);
	} else {
	center_channels = center_channels_5ghz;
	num_chan = ARRAY_SIZE(center_channels_5ghz);
	}

	center_chan = get_center_80mhz(mode, channel, center_channels,
	num_chan);
	if (!center_chan)
	return NOT_ALLOWED;

	/* check all the channels are available */
	for (i = 0; i < 4; i++) {
	unsigned int flags;
	u8 adj_chan = center_chan - 6 + i * 4;

	if (allow_channel(mode, op_class, adj_chan, &flags) ==
	NOT_ALLOWED)
	return NOT_ALLOWED;

	if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL))
	return NOT_ALLOWED;

	if (flags & HOSTAPD_CHAN_NO_IR)
	no_ir = 1;
	}

	if (no_ir)
	return NO_IR;

	return ALLOWED;
	}


	static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel,
	const u8 *center_channels, size_t num_chan)
	{
	unsigned int i;

	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
	return 0;

	for (i = 0; i < num_chan; i++) {
	/*
	* In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
	* so the center channel is 14 channels away from the start/end.
	*/
	if (channel >= center_channels[i] - 14 &&
	channel <= center_channels[i] + 14)
	return center_channels[i];
	}

	return 0;
	}


	static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
	u8 op_class, u8 channel)
	{
	u8 center_chan;
	unsigned int i;
	unsigned int no_ir = 0;
	const u8 *center_channels;
	size_t num_chan;
	const u8 center_channels_5ghz[] = { 50, 114, 163 };
	const u8 center_channels_6ghz[] = { 15, 47, 79, 111, 143, 175, 207 };

	if (is_6ghz_op_class(op_class)) {
	center_channels = center_channels_6ghz;
	num_chan = ARRAY_SIZE(center_channels_6ghz);
	} else {
	center_channels = center_channels_5ghz;
	num_chan = ARRAY_SIZE(center_channels_5ghz);
	}

	center_chan = get_center_160mhz(mode, channel, center_channels,
	num_chan);
	if (!center_chan)
	return NOT_ALLOWED;

	/* Check all the channels are available */
	for (i = 0; i < 8; i++) {
	unsigned int flags;
	u8 adj_chan = center_chan - 14 + i * 4;

	if (allow_channel(mode, op_class, adj_chan, &flags) ==
	NOT_ALLOWED)
	return NOT_ALLOWED;

	if (!(flags & HOSTAPD_CHAN_VHT_80MHZ_SUBCHANNEL) \|\|
	!(flags & HOSTAPD_CHAN_VHT_160MHZ_SUBCHANNEL))
	return NOT_ALLOWED;

	if (flags & HOSTAPD_CHAN_NO_IR)
	no_ir = 1;
	}

	if (no_ir)
	return NO_IR;

	return ALLOWED;
	}


	enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 op_class,
	u8 channel, u8 bw)
	{
	unsigned int flag = 0;
	enum chan_allowed res, res2;

	res2 = res = allow_channel(mode, op_class, channel, &flag);
	if (bw == BW40MINUS \|\| (bw == BW40 && (((channel - 1) / 4) % 2))) {
	if (!(flag & HOSTAPD_CHAN_HT40MINUS))
	return NOT_ALLOWED;
	res2 = allow_channel(mode, op_class, channel - 4, NULL);
	} else if (bw == BW40PLUS) {
	if (!(flag & HOSTAPD_CHAN_HT40PLUS))
	return NOT_ALLOWED;
	res2 = allow_channel(mode, op_class, channel + 4, NULL);
	} else if (is_6ghz_op_class(op_class) && bw == BW40) {
	if (get_6ghz_sec_channel(channel) < 0)
	res2 = allow_channel(mode, op_class, channel - 4, NULL);
	else
	res2 = allow_channel(mode, op_class, channel + 4, NULL);
	} else if (bw == BW80) {
	/*
	* channel is a center channel and as such, not necessarily a
	* valid 20 MHz channels. Override earlier allow_channel()
	* result and use only the 80 MHz specific version.
	*/
	res2 = res = verify_80mhz(mode, op_class, channel);
	} else if (bw == BW160) {
	/*
	* channel is a center channel and as such, not necessarily a
	* valid 20 MHz channels. Override earlier allow_channel()
	* result and use only the 160 MHz specific version.
	*/
	res2 = res = verify_160mhz(mode, op_class, channel);
	} else if (bw == BW80P80) {
	/*
	* channel is a center channel and as such, not necessarily a
	* valid 20 MHz channels. Override earlier allow_channel()
	* result and use only the 80 MHz specific version.
	*/
	res2 = res = verify_80mhz(mode, op_class, channel);
	}

	if (res == NOT_ALLOWED \|\| res2 == NOT_ALLOWED)
	return NOT_ALLOWED;

	if (res == NO_IR \|\| res2 == NO_IR)
	return NO_IR;

	return ALLOWED;
	}


	static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
	struct wpa_ssid *ssid,
	const struct oper_class_map *op_class)
	{
	int chan;
	size_t i;
	struct hostapd_hw_modes *mode;
	int found;
	int z;
	int freq2 = 0;
	int freq5 = 0;

	mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode,
	is_6ghz_op_class(op_class->op_class));
	if (!mode)
	return 0;

	/* If we are configured to disable certain things, take that into
	* account here. */
	if (ssid && ssid->freq_list && ssid->freq_list[0]) {
	for (z = 0; ; z++) {
	int f = ssid->freq_list[z];

	if (f == 0)
	break; /* end of list */
	if (f > 4000 && f < 6000)
	freq5 = 1;
	else if (f > 2400 && f < 2500)
	freq2 = 1;
	}
	} else {
	/* No frequencies specified, can use anything hardware supports.
	*/
	freq2 = freq5 = 1;
	}

	if (op_class->op_class >= 115 && op_class->op_class <= 130 && !freq5)
	return 0;
	if (op_class->op_class >= 81 && op_class->op_class <= 84 && !freq2)
	return 0;

	#ifdef CONFIG_HT_OVERRIDES
	if (ssid && ssid->disable_ht) {
	switch (op_class->op_class) {
	case 83:
	case 84:
	case 104:
	case 105:
	case 116:
	case 117:
	case 119:
	case 120:
	case 122:
	case 123:
	case 126:
	case 127:
	case 128:
	case 129:
	case 130:
	/* Disable >= 40 MHz channels if HT is disabled */
	return 0;
	}
	}
	#endif /* CONFIG_HT_OVERRIDES */

	#ifdef CONFIG_VHT_OVERRIDES
	if (ssid && ssid->disable_vht) {
	if (op_class->op_class >= 128 && op_class->op_class <= 130) {
	/* Disable >= 80 MHz channels if VHT is disabled */
	return 0;
	}
	}
	#endif /* CONFIG_VHT_OVERRIDES */

	if (op_class->op_class == 128) {
	u8 channels[] = { 42, 58, 106, 122, 138, 155, 171 };

	for (i = 0; i < ARRAY_SIZE(channels); i++) {
	if (verify_channel(mode, op_class->op_class,
	channels[i], op_class->bw) !=
	NOT_ALLOWED)
	return 1;
	}

	return 0;
	}

	if (op_class->op_class == 129) {
	/* Check if either 160 MHz channels is allowed */
	return verify_channel(mode, op_class->op_class, 50,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 114,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 163,
	op_class->bw) != NOT_ALLOWED;
	}

	if (op_class->op_class == 130) {
	/* Need at least two non-contiguous 80 MHz segments */
	found = 0;

	if (verify_channel(mode, op_class->op_class, 42,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 58,
	op_class->bw) != NOT_ALLOWED)
	found++;
	if (verify_channel(mode, op_class->op_class, 106,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 122,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 138,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 155,
	op_class->bw) != NOT_ALLOWED \|\|
	verify_channel(mode, op_class->op_class, 171,
	op_class->bw) != NOT_ALLOWED)
	found++;
	if (verify_channel(mode, op_class->op_class, 106,
	op_class->bw) != NOT_ALLOWED &&
	verify_channel(mode, op_class->op_class, 138,
	op_class->bw) != NOT_ALLOWED)
	found++;
	if (verify_channel(mode, op_class->op_class, 122,
	op_class->bw) != NOT_ALLOWED &&
	verify_channel(mode, op_class->op_class, 155,
	op_class->bw) != NOT_ALLOWED)
	found++;
	if (verify_channel(mode, op_class->op_class, 138,
	op_class->bw) != NOT_ALLOWED &&
	verify_channel(mode, op_class->op_class, 171,
	op_class->bw) != NOT_ALLOWED)
	found++;

	if (found >= 2)
	return 1;

	return 0;
	}

	if (op_class->op_class == 135) {
	/* Need at least two 80 MHz segments which do not fall under the
	* same 160 MHz segment to support 80+80 in 6 GHz.
	*/
	int first_seg = 0;
	int curr_seg = 0;

	for (chan = op_class->min_chan; chan <= op_class->max_chan;
	chan += op_class->inc) {
	curr_seg++;
	if (verify_channel(mode, op_class->op_class, chan,
	op_class->bw) != NOT_ALLOWED) {
	if (!first_seg) {
	first_seg = curr_seg;
	continue;
	}

	/* Supported if at least two non-consecutive 80
	* MHz segments allowed.
	*/
	if ((curr_seg - first_seg) > 1)
	return 1;

	/* Supported even if the 80 MHz segments are
	* consecutive when they do not fall under the
	* same 160 MHz segment.
	*/
	if ((first_seg % 2) == 0)
	return 1;
	}
	}

	return 0;
	}

	found = 0;
	for (chan = op_class->min_chan; chan <= op_class->max_chan;
	chan += op_class->inc) {
	if (verify_channel(mode, op_class->op_class, chan,
	op_class->bw) != NOT_ALLOWED) {
	found = 1;
	break;
	}
	}

	return found;
	}


	static int wpas_sta_secondary_channel_offset(struct wpa_bss bss, u8 current,
	u8 *channel)
	{

	const u8 *ies;
	u8 phy_type;
	size_t ies_len;

	if (!bss)
	return -1;
	ies = wpa_bss_ie_ptr(bss);
	ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
	return wpas_get_op_chan_phy(bss->freq, ies, ies_len, current,
	channel, &phy_type);
	}


	size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s,
	struct wpa_ssid *ssid,
	struct wpa_bss bss, u8 pos, size_t len)
	{
	struct wpabuf *buf;
	u8 op, current, chan;
	u8 *ie_len;
	size_t res;

	/*
	* Determine the current operating class correct mode based on
	* advertised BSS capabilities, if available. Fall back to a less
	* accurate guess based on frequency if the needed IEs are not available
	* or used.
	*/
	if (wpas_sta_secondary_channel_offset(bss, &current, &chan) < 0 &&
	ieee80211_freq_to_channel_ext(bss->freq, 0,
	CONF_OPER_CHWIDTH_USE_HT, &current,
	&chan) == NUM_HOSTAPD_MODES)
	return 0;

	/*
	* Need 3 bytes for EID, length, and current operating class, plus
	* 1 byte for every other supported operating class.
	*/
	buf = wpabuf_alloc(global_op_class_size + 3);
	if (!buf)
	return 0;

	wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
	/* Will set the length later, putting a placeholder */
	ie_len = wpabuf_put(buf, 1);
	wpabuf_put_u8(buf, current);

	for (op = 0; global_op_class[op].op_class; op++) {
	if (wpas_op_class_supported(wpa_s, ssid, &global_op_class[op]))
	wpabuf_put_u8(buf, global_op_class[op].op_class);
	}

	*ie_len = wpabuf_len(buf) - 2;
	if (*ie_len < 2) {
	wpa_printf(MSG_DEBUG,
	"No supported operating classes IE to add");
	res = 0;
	} else if (wpabuf_len(buf) > len) {
	wpa_printf(MSG_ERROR,
	"Supported operating classes IE exceeds maximum buffer length");
	res = 0;
	} else {
	os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
	res = wpabuf_len(buf);
	wpa_hexdump_buf(MSG_DEBUG,
	"Added supported operating classes IE", buf);
	}

	wpabuf_free(buf);
	return res;
	}


	int * wpas_supp_op_classes(struct wpa_supplicant *wpa_s)
	{
	int op;
	unsigned int pos, max_num = 0;
	int *classes;

	for (op = 0; global_op_class[op].op_class; op++)
	max_num++;
	classes = os_zalloc((max_num + 1) * sizeof(int));
	if (!classes)
	return NULL;

	for (op = 0, pos = 0; global_op_class[op].op_class; op++) {
	if (wpas_op_class_supported(wpa_s, NULL, &global_op_class[op]))
	classes[pos++] = global_op_class[op].op_class;
	}

	return classes;
	}