[thirdparty/hostap.git] / wpa_supplicant / op_classes.c

/*
 * 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"


static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
				       unsigned int *flags)
{
	int i;

	for (i = 0; i < mode->num_channels; i++) {
		if (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)
{
	u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
	size_t i;

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

	for (i = 0; i < ARRAY_SIZE(center_channels); 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 channel)
{
	u8 center_chan;
	unsigned int i;
	unsigned int no_ir = 0;

	center_chan = get_center_80mhz(mode, channel);
	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, adj_chan, &flags) == NOT_ALLOWED)
			return NOT_ALLOWED;

		if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
		    (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
		    (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
		    (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
			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)
{
	u8 center_channels[] = { 50, 114 };
	unsigned int i;

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

	for (i = 0; i < ARRAY_SIZE(center_channels); 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 channel)
{
	u8 center_chan;
	unsigned int i;
	unsigned int no_ir = 0;

	center_chan = get_center_160mhz(mode, channel);
	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, adj_chan, &flags) == NOT_ALLOWED)
			return NOT_ALLOWED;

		if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
		    (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
		    (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
		    (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
		    (i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
		    (i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
		    (i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
		    (i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
			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 channel,
				 u8 bw)
{
	unsigned int flag = 0;
	enum chan_allowed res, res2;

	res2 = res = allow_channel(mode, channel, &flag);
	if (bw == BW40MINUS) {
		if (!(flag & HOSTAPD_CHAN_HT40MINUS))
			return NOT_ALLOWED;
		res2 = allow_channel(mode, channel - 4, NULL);
	} else if (bw == BW40PLUS) {
		if (!(flag & HOSTAPD_CHAN_HT40PLUS))
			return NOT_ALLOWED;
		res2 = allow_channel(mode, 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, 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, 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, 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;

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

#ifdef CONFIG_HT_OVERRIDES
	if (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->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 };

		for (i = 0; i < ARRAY_SIZE(channels); i++) {
			if (verify_channel(mode, 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, 50, op_class->bw) != NOT_ALLOWED ||
			verify_channel(mode, 114, 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, 42, op_class->bw) != NOT_ALLOWED ||
		    verify_channel(mode, 58, op_class->bw) != NOT_ALLOWED)
			found++;
		if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED ||
		    verify_channel(mode, 122, op_class->bw) != NOT_ALLOWED ||
		    verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
			found++;
		if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED &&
		    verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
			found++;
		if (verify_channel(mode, 155, op_class->bw) != NOT_ALLOWED)
			found++;

		if (found >= 2)
			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, chan, op_class->bw) != NOT_ALLOWED) {
			found = 1;
			break;
		}
	}

	return found;
}


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

	/*
	 * Assume 20 MHz channel for now.
	 * TODO: Use the secondary channel and VHT channel width that will be
	 * used after association.
	 */
	if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_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 || wpabuf_len(buf) > len) {
		wpa_printf(MSG_ERROR,
			   "Failed to add supported operating classes IE");
		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;
}
Commit	Line	Data
065c029a	1	/*
	2	* Operating classes
	3	* Copyright(c) 2015 Intel Deutschland GmbH
	4	* Contact Information:
	5	* Intel Linux Wireless <ilw@linux.intel.com>
	6	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	7	*
	8	* This software may be distributed under the terms of the BSD license.
	9	* See README for more details.
	10	*/
	11
	12	#include "utils/includes.h"
	13
	14	#include "utils/common.h"
	15	#include "common/ieee802_11_common.h"
	16	#include "wpa_supplicant_i.h"
	17
	18
065c029a	19	static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
	20	unsigned int *flags)
	21	{
	22	int i;
	23
	24	for (i = 0; i < mode->num_channels; i++) {
	25	if (mode->channels[i].chan == chan)
	26	break;
	27	}
	28
	29	if (i == mode->num_channels \|\|
	30	(mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
	31	return NOT_ALLOWED;
	32
	33	if (flags)
	34	*flags = mode->channels[i].flag;
	35
1ac4dba3 AS	36	if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
	37	return NO_IR;
	38
065c029a	39	return ALLOWED;
	40	}
	41
	42
	43	static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
	44	{
	45	u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
	46	size_t i;
	47
	48	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
	49	return 0;
	50
	51	for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
	52	/*
	53	* In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
	54	* so the center channel is 6 channels away from the start/end.
	55	*/
	56	if (channel >= center_channels[i] - 6 &&
	57	channel <= center_channels[i] + 6)
	58	return center_channels[i];
	59	}
	60
	61	return 0;
	62	}
	63
	64
	65	static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
	66	{
	67	u8 center_chan;
	68	unsigned int i;
1ac4dba3	69	unsigned int no_ir = 0;
065c029a	70
	71	center_chan = get_center_80mhz(mode, channel);
	72	if (!center_chan)
	73	return NOT_ALLOWED;
	74
	75	/* check all the channels are available */
	76	for (i = 0; i < 4; i++) {
	77	unsigned int flags;
	78	u8 adj_chan = center_chan - 6 + i * 4;
	79
	80	if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
	81	return NOT_ALLOWED;
	82
	83	if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) \|\|
	84	(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) \|\|
	85	(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) \|\|
	86	(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
	87	return NOT_ALLOWED;
1ac4dba3 AS	88
	89	if (flags & HOSTAPD_CHAN_NO_IR)
	90	no_ir = 1;
065c029a	91	}
065c029a	92
1ac4dba3 AS	93	if (no_ir)
	94	return NO_IR;
	95
065c029a	96	return ALLOWED;
	97	}
	98
	99
	100	static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
	101	{
	102	u8 center_channels[] = { 50, 114 };
	103	unsigned int i;
	104
	105	if (mode->mode != HOSTAPD_MODE_IEEE80211A)
	106	return 0;
	107
	108	for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
	109	/*
	110	* In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
	111	* so the center channel is 14 channels away from the start/end.
	112	*/
	113	if (channel >= center_channels[i] - 14 &&
	114	channel <= center_channels[i] + 14)
	115	return center_channels[i];
	116	}
	117
	118	return 0;
	119	}
	120
	121
	122	static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
	123	u8 channel)
	124	{
	125	u8 center_chan;
	126	unsigned int i;
1ac4dba3	127	unsigned int no_ir = 0;
065c029a	128
	129	center_chan = get_center_160mhz(mode, channel);
	130	if (!center_chan)
	131	return NOT_ALLOWED;
	132
	133	/* Check all the channels are available */
	134	for (i = 0; i < 8; i++) {
	135	unsigned int flags;
	136	u8 adj_chan = center_chan - 14 + i * 4;
	137
	138	if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
	139	return NOT_ALLOWED;
	140
	141	if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) \|\|
	142	(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) \|\|
	143	(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) \|\|
	144	(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) \|\|
	145	(i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) \|\|
	146	(i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) \|\|
	147	(i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) \|\|
	148	(i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
	149	return NOT_ALLOWED;
1ac4dba3 AS	150
	151	if (flags & HOSTAPD_CHAN_NO_IR)
	152	no_ir = 1;
065c029a	153	}
065c029a	154
1ac4dba3 AS	155	if (no_ir)
	156	return NO_IR;
	157
065c029a	158	return ALLOWED;
	159	}
	160
	161
1ac4dba3 AS	162	enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 channel,
1ac4dba3 AS	163	u8 bw)
065c029a	164	{
	165	unsigned int flag = 0;
	166	enum chan_allowed res, res2;
	167
	168	res2 = res = allow_channel(mode, channel, &flag);
	169	if (bw == BW40MINUS) {
	170	if (!(flag & HOSTAPD_CHAN_HT40MINUS))
	171	return NOT_ALLOWED;
	172	res2 = allow_channel(mode, channel - 4, NULL);
	173	} else if (bw == BW40PLUS) {
	174	if (!(flag & HOSTAPD_CHAN_HT40PLUS))
	175	return NOT_ALLOWED;
	176	res2 = allow_channel(mode, channel + 4, NULL);
	177	} else if (bw == BW80) {
	178	/*
	179	* channel is a center channel and as such, not necessarily a
	180	* valid 20 MHz channels. Override earlier allow_channel()
	181	* result and use only the 80 MHz specific version.
	182	*/
	183	res2 = res = verify_80mhz(mode, channel);
	184	} else if (bw == BW160) {
	185	/*
	186	* channel is a center channel and as such, not necessarily a
	187	* valid 20 MHz channels. Override earlier allow_channel()
	188	* result and use only the 160 MHz specific version.
	189	*/
	190	res2 = res = verify_160mhz(mode, channel);
	191	} else if (bw == BW80P80) {
	192	/*
	193	* channel is a center channel and as such, not necessarily a
	194	* valid 20 MHz channels. Override earlier allow_channel()
	195	* result and use only the 80 MHz specific version.
	196	*/
	197	res2 = res = verify_80mhz(mode, channel);
	198	}
	199
	200	if (res == NOT_ALLOWED \|\| res2 == NOT_ALLOWED)
	201	return NOT_ALLOWED;
	202
1ac4dba3 AS	203	if (res == NO_IR \|\| res2 == NO_IR)
	204	return NO_IR;
	205
065c029a	206	return ALLOWED;
	207	}
	208
	209
	210	static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
cb828507	211	struct wpa_ssid *ssid,
065c029a	212	const struct oper_class_map *op_class)
	213	{
	214	int chan;
	215	size_t i;
	216	struct hostapd_hw_modes *mode;
	217	int found;
	218
	219	mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
	220	if (!mode)
	221	return 0;
	222
cb828507 BG	223	#ifdef CONFIG_HT_OVERRIDES
	224	if (ssid->disable_ht) {
	225	switch (op_class->op_class) {
	226	case 83:
	227	case 84:
	228	case 104:
	229	case 105:
	230	case 116:
	231	case 117:
	232	case 119:
	233	case 120:
	234	case 122:
	235	case 123:
	236	case 126:
	237	case 127:
	238	case 128:
	239	case 129:
	240	case 130:
	241	/* Disable >= 40 MHz channels if HT is disabled */
	242	return 0;
	243	}
	244	}
	245	#endif /* CONFIG_HT_OVERRIDES */
	246
	247	#ifdef CONFIG_VHT_OVERRIDES
	248	if (ssid->disable_vht) {
	249	if (op_class->op_class >= 128 && op_class->op_class <= 130) {
	250	/* Disable >= 80 MHz channels if VHT is disabled */
	251	return 0;
	252	}
	253	}
	254	#endif /* CONFIG_VHT_OVERRIDES */
	255
065c029a	256	if (op_class->op_class == 128) {
	257	u8 channels[] = { 42, 58, 106, 122, 138, 155 };
	258
	259	for (i = 0; i < ARRAY_SIZE(channels); i++) {
1ac4dba3 AS	260	if (verify_channel(mode, channels[i], op_class->bw) !=
1ac4dba3 AS	261	NOT_ALLOWED)
065c029a	262	return 1;
	263	}
	264
	265	return 0;
	266	}
	267
	268	if (op_class->op_class == 129) {
	269	/* Check if either 160 MHz channels is allowed */
1ac4dba3 AS	270	return verify_channel(mode, 50, op_class->bw) != NOT_ALLOWED \|\|
1ac4dba3 AS	271	verify_channel(mode, 114, op_class->bw) != NOT_ALLOWED;
065c029a	272	}
	273
	274	if (op_class->op_class == 130) {
	275	/* Need at least two non-contiguous 80 MHz segments */
	276	found = 0;
	277
1ac4dba3 AS	278	if (verify_channel(mode, 42, op_class->bw) != NOT_ALLOWED \|\|
1ac4dba3 AS	279	verify_channel(mode, 58, op_class->bw) != NOT_ALLOWED)
065c029a	280	found++;
1ac4dba3 AS	281	if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED \|\|
	282	verify_channel(mode, 122, op_class->bw) != NOT_ALLOWED \|\|
	283	verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
065c029a	284	found++;
1ac4dba3 AS	285	if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED &&
1ac4dba3 AS	286	verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
065c029a	287	found++;
1ac4dba3	288	if (verify_channel(mode, 155, op_class->bw) != NOT_ALLOWED)
065c029a	289	found++;
	290
	291	if (found >= 2)
	292	return 1;
	293
	294	return 0;
	295	}
	296
	297	found = 0;
	298	for (chan = op_class->min_chan; chan <= op_class->max_chan;
	299	chan += op_class->inc) {
1ac4dba3	300	if (verify_channel(mode, chan, op_class->bw) != NOT_ALLOWED) {
065c029a	301	found = 1;
	302	break;
	303	}
	304	}
	305
	306	return found;
	307	}
	308
	309
cb828507 BG	310	size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s,
	311	struct wpa_ssid *ssid,
	312	int freq, u8 *pos, size_t len)
065c029a	313	{
	314	struct wpabuf *buf;
	315	u8 op, current, chan;
	316	u8 *ie_len;
	317	size_t res;
	318
	319	/*
	320	* Assume 20 MHz channel for now.
	321	* TODO: Use the secondary channel and VHT channel width that will be
	322	* used after association.
	323	*/
	324	if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
	325	&current, &chan) == NUM_HOSTAPD_MODES)
	326	return 0;
	327
	328	/*
	329	* Need 3 bytes for EID, length, and current operating class, plus
	330	* 1 byte for every other supported operating class.
	331	*/
	332	buf = wpabuf_alloc(global_op_class_size + 3);
	333	if (!buf)
	334	return 0;
	335
	336	wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
	337	/* Will set the length later, putting a placeholder */
	338	ie_len = wpabuf_put(buf, 1);
	339	wpabuf_put_u8(buf, current);
	340
	341	for (op = 0; global_op_class[op].op_class; op++) {
cb828507	342	if (wpas_op_class_supported(wpa_s, ssid, &global_op_class[op]))
065c029a	343	wpabuf_put_u8(buf, global_op_class[op].op_class);
	344	}
	345
	346	*ie_len = wpabuf_len(buf) - 2;
	347	if (*ie_len < 2 \|\| wpabuf_len(buf) > len) {
	348	wpa_printf(MSG_ERROR,
	349	"Failed to add supported operating classes IE");
	350	res = 0;
	351	} else {
	352	os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
	353	res = wpabuf_len(buf);
	354	wpa_hexdump_buf(MSG_DEBUG,
	355	"Added supported operating classes IE", buf);
	356	}
	357
	358	wpabuf_free(buf);
	359	return res;
	360	}