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

/*
 * wpa_supplicant - MBO
 *
 * 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_defs.h"
#include "common/gas.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "bss.h"
#include "scan.h"

/* type + length + oui + oui type */
#define MBO_IE_HEADER 6


static int wpas_mbo_validate_non_pref_chan(u8 oper_class, u8 chan, u8 reason)
{
	if (reason > MBO_NON_PREF_CHAN_REASON_INT_INTERFERENCE)
		return -1;

	/* Only checking the validity of the channel and oper_class */
	if (ieee80211_chan_to_freq(NULL, oper_class, chan) == -1)
		return -1;

	return 0;
}


const u8 * mbo_attr_from_mbo_ie(const u8 *mbo_ie, enum mbo_attr_id attr)
{
	const u8 *mbo;
	u8 ie_len = mbo_ie[1];

	if (ie_len < MBO_IE_HEADER - 2)
		return NULL;
	mbo = mbo_ie + MBO_IE_HEADER;

	return get_ie(mbo, 2 + ie_len - MBO_IE_HEADER, attr);
}


const u8 * mbo_get_attr_from_ies(const u8 *ies, size_t ies_len,
				 enum mbo_attr_id attr)
{
	const u8 *mbo_ie;

	mbo_ie = get_vendor_ie(ies, ies_len, MBO_IE_VENDOR_TYPE);
	if (!mbo_ie)
		return NULL;

	return mbo_attr_from_mbo_ie(mbo_ie, attr);
}


const u8 * wpas_mbo_get_bss_attr(struct wpa_bss *bss, enum mbo_attr_id attr)
{
	const u8 *mbo, *end;

	if (!bss)
		return NULL;

	mbo = wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE);
	if (!mbo)
		return NULL;

	end = mbo + 2 + mbo[1];
	mbo += MBO_IE_HEADER;

	return get_ie(mbo, end - mbo, attr);
}


static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
					     struct wpabuf *mbo,
					     u8 start, u8 end)
{
	u8 i;

	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].oper_class);

	for (i = start; i < end; i++)
		wpabuf_put_u8(mbo, wpa_s->non_pref_chan[i].chan);

	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].preference);
	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason);
}


static void wpas_mbo_non_pref_chan_attr_hdr(struct wpabuf *mbo, size_t size)
{
	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
	wpabuf_put_u8(mbo, size); /* Length */
}


static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
					struct wpabuf *mbo, u8 start, u8 end)
{
	size_t size = end - start + 3;

	if (size + 2 > wpabuf_tailroom(mbo))
		return;

	wpas_mbo_non_pref_chan_attr_hdr(mbo, size);
	wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
}


static void wpas_mbo_non_pref_chan_subelem_hdr(struct wpabuf *mbo, u8 len)
{
	wpabuf_put_u8(mbo, WLAN_EID_VENDOR_SPECIFIC);
	wpabuf_put_u8(mbo, len); /* Length */
	wpabuf_put_be24(mbo, OUI_WFA);
	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
}


static void wpas_mbo_non_pref_chan_subelement(struct wpa_supplicant *wpa_s,
					      struct wpabuf *mbo, u8 start,
					      u8 end)
{
	size_t size = end - start + 7;

	if (size + 2 > wpabuf_tailroom(mbo))
		return;

	wpas_mbo_non_pref_chan_subelem_hdr(mbo, size);
	wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
}


static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
					 struct wpabuf *mbo, int subelement)
{
	u8 i, start = 0;
	struct wpa_mbo_non_pref_channel *start_pref;

	if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num) {
		if (subelement)
			wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
		else
			wpas_mbo_non_pref_chan_attr_hdr(mbo, 0);
		return;
	}
	start_pref = &wpa_s->non_pref_chan[0];

	for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
		struct wpa_mbo_non_pref_channel *non_pref = NULL;

		if (i < wpa_s->non_pref_chan_num)
			non_pref = &wpa_s->non_pref_chan[i];
		if (!non_pref ||
		    non_pref->oper_class != start_pref->oper_class ||
		    non_pref->reason != start_pref->reason ||
		    non_pref->preference != start_pref->preference) {
			if (subelement)
				wpas_mbo_non_pref_chan_subelement(wpa_s, mbo,
								  start, i);
			else
				wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start,
							    i);

			if (!non_pref)
				return;

			start = i;
			start_pref = non_pref;
		}
	}
}


int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len,
		int add_oce_capa)
{
	struct wpabuf *mbo;
	int res;

	if (len < MBO_IE_HEADER + 3 + 7 +
	    ((wpa_s->enable_oce & OCE_STA) ? 3 : 0))
		return 0;

	/* Leave room for the MBO IE header */
	mbo = wpabuf_alloc(len - MBO_IE_HEADER);
	if (!mbo)
		return 0;

	/* Add non-preferred channels attribute */
	wpas_mbo_non_pref_chan_attrs(wpa_s, mbo, 0);

	/*
	 * Send cellular capabilities attribute even if AP does not advertise
	 * cellular capabilities.
	 */
	wpabuf_put_u8(mbo, MBO_ATTR_ID_CELL_DATA_CAPA);
	wpabuf_put_u8(mbo, 1);
	wpabuf_put_u8(mbo, wpa_s->conf->mbo_cell_capa);

	/* Add OCE capability indication attribute if OCE is enabled */
	if ((wpa_s->enable_oce & OCE_STA) && add_oce_capa) {
		wpabuf_put_u8(mbo, OCE_ATTR_ID_CAPA_IND);
		wpabuf_put_u8(mbo, 1);
		wpabuf_put_u8(mbo, OCE_RELEASE);
	}

	res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
	if (!res)
		wpa_printf(MSG_ERROR, "Failed to add MBO/OCE IE");

	wpabuf_free(mbo);
	return res;
}


static void wpas_mbo_send_wnm_notification(struct wpa_supplicant *wpa_s,
					   const u8 *data, size_t len)
{
	struct wpabuf *buf;
	int res;

	/*
	 * Send WNM-Notification Request frame only in case of a change in
	 * non-preferred channels list during association, if the AP supports
	 * MBO.
	 */
	if (wpa_s->wpa_state != WPA_COMPLETED || !wpa_s->current_bss ||
	    !wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE))
		return;

	buf = wpabuf_alloc(4 + len);
	if (!buf)
		return;

	wpabuf_put_u8(buf, WLAN_ACTION_WNM);
	wpabuf_put_u8(buf, WNM_NOTIFICATION_REQ);
	wpa_s->mbo_wnm_token++;
	if (wpa_s->mbo_wnm_token == 0)
		wpa_s->mbo_wnm_token++;
	wpabuf_put_u8(buf, wpa_s->mbo_wnm_token);
	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); /* Type */

	wpabuf_put_data(buf, data, len);

	res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
				  wpa_s->own_addr, wpa_s->bssid,
				  wpabuf_head(buf), wpabuf_len(buf), 0);
	if (res < 0)
		wpa_printf(MSG_DEBUG,
			   "Failed to send WNM-Notification Request frame with non-preferred channel list");

	wpabuf_free(buf);
}


static void wpas_mbo_non_pref_chan_changed(struct wpa_supplicant *wpa_s)
{
	struct wpabuf *buf;

	buf = wpabuf_alloc(512);
	if (!buf)
		return;

	wpas_mbo_non_pref_chan_attrs(wpa_s, buf, 1);
	wpas_mbo_send_wnm_notification(wpa_s, wpabuf_head_u8(buf),
				       wpabuf_len(buf));
	wpas_update_mbo_connect_params(wpa_s);
	wpabuf_free(buf);
}


static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
				   struct wpa_mbo_non_pref_channel *b)
{
	return a->oper_class == b->oper_class && a->chan == b->chan;
}


/*
 * wpa_non_pref_chan_cmp - Compare two channels for sorting
 *
 * In MBO IE non-preferred channel subelement we can put many channels in an
 * attribute if they are in the same operating class and have the same
 * preference and reason. To make it easy for the functions that build
 * the IE attributes and WNM Request subelements, save the channels sorted
 * by their oper_class and reason.
 */
static int wpa_non_pref_chan_cmp(const void *_a, const void *_b)
{
	const struct wpa_mbo_non_pref_channel *a = _a, *b = _b;

	if (a->oper_class != b->oper_class)
		return (int) a->oper_class - (int) b->oper_class;
	if (a->reason != b->reason)
		return (int) a->reason - (int) b->reason;
	return (int) a->preference - (int) b->preference;
}


int wpas_mbo_update_non_pref_chan(struct wpa_supplicant *wpa_s,
				  const char *non_pref_chan)
{
	char *cmd, *token, *context = NULL;
	struct wpa_mbo_non_pref_channel *chans = NULL, *tmp_chans;
	size_t num = 0, size = 0;
	unsigned i;

	wpa_printf(MSG_DEBUG, "MBO: Update non-preferred channels, non_pref_chan=%s",
		   non_pref_chan ? non_pref_chan : "N/A");

	/*
	 * The shortest channel configuration is 7 characters - 3 colons and
	 * 4 values.
	 */
	if (!non_pref_chan || os_strlen(non_pref_chan) < 7)
		goto update;

	cmd = os_strdup(non_pref_chan);
	if (!cmd)
		return -1;

	while ((token = str_token(cmd, " ", &context))) {
		struct wpa_mbo_non_pref_channel *chan;
		int ret;
		unsigned int _oper_class;
		unsigned int _chan;
		unsigned int _preference;
		unsigned int _reason;

		if (num == size) {
			size = size ? size * 2 : 1;
			tmp_chans = os_realloc_array(chans, size,
						     sizeof(*chans));
			if (!tmp_chans) {
				wpa_printf(MSG_ERROR,
					   "Couldn't reallocate non_pref_chan");
				goto fail;
			}
			chans = tmp_chans;
		}

		chan = &chans[num];

		ret = sscanf(token, "%u:%u:%u:%u", &_oper_class,
			     &_chan, &_preference, &_reason);
		if (ret != 4 ||
		    _oper_class > 255 || _chan > 255 ||
		    _preference > 255 || _reason > 65535 ) {
			wpa_printf(MSG_ERROR, "Invalid non-pref chan input %s",
				   token);
			goto fail;
		}
		chan->oper_class = _oper_class;
		chan->chan = _chan;
		chan->preference = _preference;
		chan->reason = _reason;

		if (wpas_mbo_validate_non_pref_chan(chan->oper_class,
						    chan->chan, chan->reason)) {
			wpa_printf(MSG_ERROR,
				   "Invalid non_pref_chan: oper class %d chan %d reason %d",
				   chan->oper_class, chan->chan, chan->reason);
			goto fail;
		}

		for (i = 0; i < num; i++)
			if (wpa_non_pref_chan_is_eq(chan, &chans[i]))
				break;
		if (i != num) {
			wpa_printf(MSG_ERROR,
				   "oper class %d chan %d is duplicated",
				   chan->oper_class, chan->chan);
			goto fail;
		}

		num++;
	}

	os_free(cmd);

	if (chans) {
		qsort(chans, num, sizeof(struct wpa_mbo_non_pref_channel),
		      wpa_non_pref_chan_cmp);
	}

update:
	os_free(wpa_s->non_pref_chan);
	wpa_s->non_pref_chan = chans;
	wpa_s->non_pref_chan_num = num;
	wpas_mbo_non_pref_chan_changed(wpa_s);

	return 0;

fail:
	os_free(chans);
	os_free(cmd);
	return -1;
}


void wpas_mbo_scan_ie(struct wpa_supplicant *wpa_s, struct wpabuf *ie)
{
	u8 *len;

	wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
	len = wpabuf_put(ie, 1);

	wpabuf_put_be24(ie, OUI_WFA);
	wpabuf_put_u8(ie, MBO_OUI_TYPE);

	wpabuf_put_u8(ie, MBO_ATTR_ID_CELL_DATA_CAPA);
	wpabuf_put_u8(ie, 1);
	wpabuf_put_u8(ie, wpa_s->conf->mbo_cell_capa);
	if (wpa_s->enable_oce & OCE_STA) {
		wpabuf_put_u8(ie, OCE_ATTR_ID_CAPA_IND);
		wpabuf_put_u8(ie, 1);
		wpabuf_put_u8(ie, OCE_RELEASE);
	}
	*len = (u8 *) wpabuf_put(ie, 0) - len - 1;
}


void wpas_mbo_ie_trans_req(struct wpa_supplicant *wpa_s, const u8 *mbo_ie,
			   size_t len)
{
	const u8 *pos, *cell_pref = NULL;
	u8 id, elen;
	u16 disallowed_sec = 0;

	if (len <= 4 || WPA_GET_BE24(mbo_ie) != OUI_WFA ||
	    mbo_ie[3] != MBO_OUI_TYPE)
		return;

	pos = mbo_ie + 4;
	len -= 4;

	while (len >= 2) {
		id = *pos++;
		elen = *pos++;
		len -= 2;

		if (elen > len)
			goto fail;

		switch (id) {
		case MBO_ATTR_ID_CELL_DATA_PREF:
			if (elen != 1)
				goto fail;

			if (wpa_s->conf->mbo_cell_capa ==
			    MBO_CELL_CAPA_AVAILABLE)
				cell_pref = pos;
			else
				wpa_printf(MSG_DEBUG,
					   "MBO: Station does not support Cellular data connection");
			break;
		case MBO_ATTR_ID_TRANSITION_REASON:
			if (elen != 1)
				goto fail;

			wpa_s->wnm_mbo_trans_reason_present = 1;
			wpa_s->wnm_mbo_transition_reason = *pos;
			break;
		case MBO_ATTR_ID_ASSOC_RETRY_DELAY:
			if (elen != 2)
				goto fail;

			if (wpa_s->wnm_mode &
			    WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
				wpa_printf(MSG_DEBUG,
					   "MBO: Unexpected association retry delay, BSS is terminating");
				goto fail;
			} else if (wpa_s->wnm_mode &
				   WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
				disallowed_sec = WPA_GET_LE16(pos);
				wpa_printf(MSG_DEBUG,
					   "MBO: Association retry delay: %u",
					   disallowed_sec);
			} else {
				wpa_printf(MSG_DEBUG,
					   "MBO: Association retry delay attribute not in disassoc imminent mode");
			}

			break;
		case MBO_ATTR_ID_AP_CAPA_IND:
		case MBO_ATTR_ID_NON_PREF_CHAN_REPORT:
		case MBO_ATTR_ID_CELL_DATA_CAPA:
		case MBO_ATTR_ID_ASSOC_DISALLOW:
		case MBO_ATTR_ID_TRANSITION_REJECT_REASON:
			wpa_printf(MSG_DEBUG,
				   "MBO: Attribute %d should not be included in BTM Request frame",
				   id);
			break;
		default:
			wpa_printf(MSG_DEBUG, "MBO: Unknown attribute id %u",
				   id);
			return;
		}

		pos += elen;
		len -= elen;
	}

	if (cell_pref)
		wpa_msg(wpa_s, MSG_INFO, MBO_CELL_PREFERENCE "preference=%u",
			*cell_pref);

	if (wpa_s->wnm_mbo_trans_reason_present)
		wpa_msg(wpa_s, MSG_INFO, MBO_TRANSITION_REASON "reason=%u",
			wpa_s->wnm_mbo_transition_reason);

	if (disallowed_sec && wpa_s->current_bss)
		wpa_bss_tmp_disallow(wpa_s, wpa_s->current_bss->bssid,
				     disallowed_sec, 0);

	return;
fail:
	wpa_printf(MSG_DEBUG, "MBO IE parsing failed (id=%u len=%u left=%zu)",
		   id, elen, len);
}


size_t wpas_mbo_ie_bss_trans_reject(struct wpa_supplicant *wpa_s, u8 *pos,
				    size_t len,
				    enum mbo_transition_reject_reason reason)
{
	u8 reject_attr[3];

	reject_attr[0] = MBO_ATTR_ID_TRANSITION_REJECT_REASON;
	reject_attr[1] = 1;
	reject_attr[2] = reason;

	return mbo_add_ie(pos, len, reject_attr, sizeof(reject_attr));
}


void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa)
{
	u8 cell_capa[7];

	if (wpa_s->conf->mbo_cell_capa == mbo_cell_capa) {
		wpa_printf(MSG_DEBUG,
			   "MBO: Cellular capability already set to %u",
			   mbo_cell_capa);
		return;
	}

	wpa_s->conf->mbo_cell_capa = mbo_cell_capa;

	cell_capa[0] = WLAN_EID_VENDOR_SPECIFIC;
	cell_capa[1] = 5; /* Length */
	WPA_PUT_BE24(cell_capa + 2, OUI_WFA);
	cell_capa[5] = MBO_ATTR_ID_CELL_DATA_CAPA;
	cell_capa[6] = mbo_cell_capa;

	wpas_mbo_send_wnm_notification(wpa_s, cell_capa, 7);
	wpa_supplicant_set_default_scan_ies(wpa_s);
	wpas_update_mbo_connect_params(wpa_s);
}


struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
				   struct wpa_bss *bss, u32 mbo_subtypes)
{
	struct wpabuf *anqp_buf;
	u8 *len_pos;
	u8 i;

	if (!wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE)) {
		wpa_printf(MSG_INFO, "MBO: " MACSTR
			   " does not support MBO - cannot request MBO ANQP elements from it",
			   MAC2STR(bss->bssid));
		return NULL;
	}

	/* Allocate size for the maximum case - all MBO subtypes are set */
	anqp_buf = wpabuf_alloc(9 + MAX_MBO_ANQP_SUBTYPE);
	if (!anqp_buf)
		return NULL;

	len_pos = gas_anqp_add_element(anqp_buf, ANQP_VENDOR_SPECIFIC);
	wpabuf_put_be24(anqp_buf, OUI_WFA);
	wpabuf_put_u8(anqp_buf, MBO_ANQP_OUI_TYPE);

	wpabuf_put_u8(anqp_buf, MBO_ANQP_SUBTYPE_QUERY_LIST);

	/* The first valid MBO subtype is 1 */
	for (i = 1; i <= MAX_MBO_ANQP_SUBTYPE; i++) {
		if (mbo_subtypes & BIT(i))
			wpabuf_put_u8(anqp_buf, i);
	}

	gas_anqp_set_element_len(anqp_buf, len_pos);

	return anqp_buf;
}


void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
			    struct wpa_bss *bss, const u8 *sa,
			    const u8 *data, size_t slen)
{
	const u8 *pos = data;
	u8 subtype;

	if (slen < 1)
		return;

	subtype = *pos++;
	slen--;

	switch (subtype) {
	case MBO_ANQP_SUBTYPE_CELL_CONN_PREF:
		if (slen < 1)
			break;
		wpa_msg(wpa_s, MSG_INFO, RX_MBO_ANQP MACSTR
			" cell_conn_pref=%u", MAC2STR(sa), *pos);
		break;
	default:
		wpa_printf(MSG_DEBUG, "MBO: Unsupported ANQP subtype %u",
			   subtype);
		break;
	}
}
Commit	Line	Data
92c6e2e3 DS	1	/*
	2	* wpa_supplicant - MBO
	3	*
	4	* Copyright(c) 2015 Intel Deutschland GmbH
	5	* Contact Information:
	6	* Intel Linux Wireless <ilw@linux.intel.com>
	7	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	8	*
	9	* This software may be distributed under the terms of the BSD license.
	10	* See README for more details.
	11	*/
	12
	13	#include "utils/includes.h"
	14
	15	#include "utils/common.h"
	16	#include "common/ieee802_11_defs.h"
8f479174	17	#include "common/gas.h"
92c6e2e3 DS	18	#include "config.h"
	19	#include "wpa_supplicant_i.h"
	20	#include "driver_i.h"
	21	#include "bss.h"
cc9985d1	22	#include "scan.h"
92c6e2e3 DS	23
	24	/* type + length + oui + oui type */
	25	#define MBO_IE_HEADER 6
	26
	27
	28	static int wpas_mbo_validate_non_pref_chan(u8 oper_class, u8 chan, u8 reason)
	29	{
	30	if (reason > MBO_NON_PREF_CHAN_REASON_INT_INTERFERENCE)
	31	return -1;
	32
	33	/* Only checking the validity of the channel and oper_class */
	34	if (ieee80211_chan_to_freq(NULL, oper_class, chan) == -1)
	35	return -1;
	36
	37	return 0;
	38	}
	39
	40
077232f6 BL	41	const u8 * mbo_attr_from_mbo_ie(const u8 *mbo_ie, enum mbo_attr_id attr)
	42	{
	43	const u8 *mbo;
	44	u8 ie_len = mbo_ie[1];
	45
	46	if (ie_len < MBO_IE_HEADER - 2)
	47	return NULL;
	48	mbo = mbo_ie + MBO_IE_HEADER;
	49
	50	return get_ie(mbo, 2 + ie_len - MBO_IE_HEADER, attr);
	51	}
	52
	53
19677b77 BL	54	const u8 * mbo_get_attr_from_ies(const u8 *ies, size_t ies_len,
	55	enum mbo_attr_id attr)
	56	{
	57	const u8 *mbo_ie;
	58
	59	mbo_ie = get_vendor_ie(ies, ies_len, MBO_IE_VENDOR_TYPE);
	60	if (!mbo_ie)
	61	return NULL;
	62
	63	return mbo_attr_from_mbo_ie(mbo_ie, attr);
	64	}
	65
	66
cb06cf34 DS	67	const u8 * wpas_mbo_get_bss_attr(struct wpa_bss *bss, enum mbo_attr_id attr)
	68	{
	69	const u8 mbo, end;
	70
	71	if (!bss)
	72	return NULL;
	73
	74	mbo = wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE);
	75	if (!mbo)
	76	return NULL;
	77
	78	end = mbo + 2 + mbo[1];
	79	mbo += MBO_IE_HEADER;
	80
	81	return get_ie(mbo, end - mbo, attr);
	82	}
	83
	84
92c6e2e3 DS	85	static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
	86	struct wpabuf *mbo,
	87	u8 start, u8 end)
	88	{
	89	u8 i;
	90
	91	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].oper_class);
	92
	93	for (i = start; i < end; i++)
	94	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[i].chan);
	95
	96	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].preference);
	97	wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason);
92c6e2e3 DS	98	}
	99
	100
74f8e768 AB	101	static void wpas_mbo_non_pref_chan_attr_hdr(struct wpabuf *mbo, size_t size)
	102	{
	103	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
	104	wpabuf_put_u8(mbo, size); /* Length */
	105	}
	106
	107
92c6e2e3 DS	108	static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
	109	struct wpabuf *mbo, u8 start, u8 end)
	110	{
4a83d4b6	111	size_t size = end - start + 3;
92c6e2e3 DS	112
	113	if (size + 2 > wpabuf_tailroom(mbo))
	114	return;
	115
74f8e768	116	wpas_mbo_non_pref_chan_attr_hdr(mbo, size);
92c6e2e3 DS	117	wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
	118	}
	119
	120
2d5b8614 DS	121	static void wpas_mbo_non_pref_chan_subelem_hdr(struct wpabuf *mbo, u8 len)
	122	{
	123	wpabuf_put_u8(mbo, WLAN_EID_VENDOR_SPECIFIC);
	124	wpabuf_put_u8(mbo, len); /* Length */
	125	wpabuf_put_be24(mbo, OUI_WFA);
	126	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
	127	}
	128
	129
	130	static void wpas_mbo_non_pref_chan_subelement(struct wpa_supplicant *wpa_s,
	131	struct wpabuf *mbo, u8 start,
	132	u8 end)
	133	{
4a83d4b6	134	size_t size = end - start + 7;
2d5b8614 DS	135
	136	if (size + 2 > wpabuf_tailroom(mbo))
	137	return;
	138
	139	wpas_mbo_non_pref_chan_subelem_hdr(mbo, size);
	140	wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
	141	}
	142
92c6e2e3	143
2d5b8614 DS	144	static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
2d5b8614 DS	145	struct wpabuf *mbo, int subelement)
92c6e2e3 DS	146	{
	147	u8 i, start = 0;
	148	struct wpa_mbo_non_pref_channel *start_pref;
	149
2d5b8614 DS	150	if (!wpa_s->non_pref_chan \|\| !wpa_s->non_pref_chan_num) {
	151	if (subelement)
	152	wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
74f8e768 AB	153	else
74f8e768 AB	154	wpas_mbo_non_pref_chan_attr_hdr(mbo, 0);
92c6e2e3	155	return;
2d5b8614	156	}
92c6e2e3 DS	157	start_pref = &wpa_s->non_pref_chan[0];
	158
	159	for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
	160	struct wpa_mbo_non_pref_channel *non_pref = NULL;
	161
	162	if (i < wpa_s->non_pref_chan_num)
	163	non_pref = &wpa_s->non_pref_chan[i];
	164	if (!non_pref \|\|
	165	non_pref->oper_class != start_pref->oper_class \|\|
	166	non_pref->reason != start_pref->reason \|\|
92c6e2e3	167	non_pref->preference != start_pref->preference) {
2d5b8614 DS	168	if (subelement)
	169	wpas_mbo_non_pref_chan_subelement(wpa_s, mbo,
	170	start, i);
	171	else
	172	wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start,
	173	i);
92c6e2e3 DS	174
	175	if (!non_pref)
	176	return;
	177
	178	start = i;
	179	start_pref = non_pref;
	180	}
	181	}
	182	}
	183
	184
077232f6 BL	185	int wpas_mbo_ie(struct wpa_supplicant wpa_s, u8 buf, size_t len,
077232f6 BL	186	int add_oce_capa)
92c6e2e3 DS	187	{
	188	struct wpabuf *mbo;
	189	int res;
	190
332aadb8 AP	191	if (len < MBO_IE_HEADER + 3 + 7 +
332aadb8 AP	192	((wpa_s->enable_oce & OCE_STA) ? 3 : 0))
92c6e2e3 DS	193	return 0;
	194
	195	/* Leave room for the MBO IE header */
	196	mbo = wpabuf_alloc(len - MBO_IE_HEADER);
	197	if (!mbo)
	198	return 0;
	199
	200	/* Add non-preferred channels attribute */
2d5b8614	201	wpas_mbo_non_pref_chan_attrs(wpa_s, mbo, 0);
92c6e2e3	202
c5d193d7 DS	203	/*
	204	* Send cellular capabilities attribute even if AP does not advertise
	205	* cellular capabilities.
	206	*/
	207	wpabuf_put_u8(mbo, MBO_ATTR_ID_CELL_DATA_CAPA);
	208	wpabuf_put_u8(mbo, 1);
	209	wpabuf_put_u8(mbo, wpa_s->conf->mbo_cell_capa);
	210
332aadb8	211	/* Add OCE capability indication attribute if OCE is enabled */
077232f6	212	if ((wpa_s->enable_oce & OCE_STA) && add_oce_capa) {
332aadb8 AP	213	wpabuf_put_u8(mbo, OCE_ATTR_ID_CAPA_IND);
	214	wpabuf_put_u8(mbo, 1);
	215	wpabuf_put_u8(mbo, OCE_RELEASE);
	216	}
	217
92c6e2e3 DS	218	res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
92c6e2e3 DS	219	if (!res)
332aadb8	220	wpa_printf(MSG_ERROR, "Failed to add MBO/OCE IE");
92c6e2e3 DS	221
	222	wpabuf_free(mbo);
	223	return res;
	224	}
	225
	226
016082e9 AS	227	static void wpas_mbo_send_wnm_notification(struct wpa_supplicant *wpa_s,
016082e9 AS	228	const u8 *data, size_t len)
2d5b8614 DS	229	{
	230	struct wpabuf *buf;
	231	int res;
	232
	233	/*
	234	* Send WNM-Notification Request frame only in case of a change in
	235	* non-preferred channels list during association, if the AP supports
	236	* MBO.
	237	*/
	238	if (wpa_s->wpa_state != WPA_COMPLETED \|\| !wpa_s->current_bss \|\|
	239	!wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE))
	240	return;
	241
016082e9	242	buf = wpabuf_alloc(4 + len);
2d5b8614 DS	243	if (!buf)
	244	return;
	245
	246	wpabuf_put_u8(buf, WLAN_ACTION_WNM);
	247	wpabuf_put_u8(buf, WNM_NOTIFICATION_REQ);
	248	wpa_s->mbo_wnm_token++;
	249	if (wpa_s->mbo_wnm_token == 0)
	250	wpa_s->mbo_wnm_token++;
	251	wpabuf_put_u8(buf, wpa_s->mbo_wnm_token);
	252	wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); /* Type */
	253
016082e9	254	wpabuf_put_data(buf, data, len);
2d5b8614 DS	255
	256	res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
	257	wpa_s->own_addr, wpa_s->bssid,
	258	wpabuf_head(buf), wpabuf_len(buf), 0);
	259	if (res < 0)
	260	wpa_printf(MSG_DEBUG,
	261	"Failed to send WNM-Notification Request frame with non-preferred channel list");
	262
	263	wpabuf_free(buf);
	264	}
	265
	266
016082e9 AS	267	static void wpas_mbo_non_pref_chan_changed(struct wpa_supplicant *wpa_s)
	268	{
	269	struct wpabuf *buf;
	270
	271	buf = wpabuf_alloc(512);
	272	if (!buf)
	273	return;
	274
	275	wpas_mbo_non_pref_chan_attrs(wpa_s, buf, 1);
	276	wpas_mbo_send_wnm_notification(wpa_s, wpabuf_head_u8(buf),
	277	wpabuf_len(buf));
822c756e	278	wpas_update_mbo_connect_params(wpa_s);
016082e9 AS	279	wpabuf_free(buf);
	280	}
	281
	282
92c6e2e3 DS	283	static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
	284	struct wpa_mbo_non_pref_channel *b)
	285	{
	286	return a->oper_class == b->oper_class && a->chan == b->chan;
	287	}
	288
	289
	290	/*
	291	* wpa_non_pref_chan_cmp - Compare two channels for sorting
	292	*
	293	* In MBO IE non-preferred channel subelement we can put many channels in an
	294	* attribute if they are in the same operating class and have the same
4a83d4b6	295	* preference and reason. To make it easy for the functions that build
	296	* the IE attributes and WNM Request subelements, save the channels sorted
	297	* by their oper_class and reason.
92c6e2e3 DS	298	*/
	299	static int wpa_non_pref_chan_cmp(const void _a, const void _b)
	300	{
	301	const struct wpa_mbo_non_pref_channel a = _a, b = _b;
	302
	303	if (a->oper_class != b->oper_class)
2f7bc068	304	return (int) a->oper_class - (int) b->oper_class;
92c6e2e3	305	if (a->reason != b->reason)
2f7bc068 JM	306	return (int) a->reason - (int) b->reason;
2f7bc068 JM	307	return (int) a->preference - (int) b->preference;
92c6e2e3 DS	308	}
	309
	310
	311	int wpas_mbo_update_non_pref_chan(struct wpa_supplicant *wpa_s,
	312	const char *non_pref_chan)
	313	{
	314	char cmd, token, *context = NULL;
	315	struct wpa_mbo_non_pref_channel chans = NULL, tmp_chans;
	316	size_t num = 0, size = 0;
	317	unsigned i;
	318
	319	wpa_printf(MSG_DEBUG, "MBO: Update non-preferred channels, non_pref_chan=%s",
	320	non_pref_chan ? non_pref_chan : "N/A");
	321
	322	/*
dca4b503 AP	323	* The shortest channel configuration is 7 characters - 3 colons and
dca4b503 AP	324	* 4 values.
92c6e2e3	325	*/
dca4b503	326	if (!non_pref_chan \|\| os_strlen(non_pref_chan) < 7)
92c6e2e3 DS	327	goto update;
	328
	329	cmd = os_strdup(non_pref_chan);
	330	if (!cmd)
	331	return -1;
	332
	333	while ((token = str_token(cmd, " ", &context))) {
	334	struct wpa_mbo_non_pref_channel *chan;
	335	int ret;
	336	unsigned int _oper_class;
	337	unsigned int _chan;
	338	unsigned int _preference;
	339	unsigned int _reason;
92c6e2e3 DS	340
	341	if (num == size) {
	342	size = size ? size * 2 : 1;
	343	tmp_chans = os_realloc_array(chans, size,
	344	sizeof(*chans));
	345	if (!tmp_chans) {
	346	wpa_printf(MSG_ERROR,
	347	"Couldn't reallocate non_pref_chan");
	348	goto fail;
	349	}
	350	chans = tmp_chans;
	351	}
	352
	353	chan = &chans[num];
	354
4a83d4b6	355	ret = sscanf(token, "%u:%u:%u:%u", &_oper_class,
	356	&_chan, &_preference, &_reason);
	357	if (ret != 4 \|\|
92c6e2e3	358	_oper_class > 255 \|\| _chan > 255 \|\|
4a83d4b6	359	_preference > 255 \|\| _reason > 65535 ) {
92c6e2e3 DS	360	wpa_printf(MSG_ERROR, "Invalid non-pref chan input %s",
	361	token);
	362	goto fail;
	363	}
	364	chan->oper_class = _oper_class;
	365	chan->chan = _chan;
	366	chan->preference = _preference;
	367	chan->reason = _reason;
92c6e2e3 DS	368
	369	if (wpas_mbo_validate_non_pref_chan(chan->oper_class,
	370	chan->chan, chan->reason)) {
	371	wpa_printf(MSG_ERROR,
	372	"Invalid non_pref_chan: oper class %d chan %d reason %d",
	373	chan->oper_class, chan->chan, chan->reason);
	374	goto fail;
	375	}
	376
	377	for (i = 0; i < num; i++)
	378	if (wpa_non_pref_chan_is_eq(chan, &chans[i]))
	379	break;
	380	if (i != num) {
	381	wpa_printf(MSG_ERROR,
	382	"oper class %d chan %d is duplicated",
	383	chan->oper_class, chan->chan);
	384	goto fail;
	385	}
	386
	387	num++;
	388	}
	389
	390	os_free(cmd);
	391
	392	if (chans) {
	393	qsort(chans, num, sizeof(struct wpa_mbo_non_pref_channel),
	394	wpa_non_pref_chan_cmp);
	395	}
	396
	397	update:
	398	os_free(wpa_s->non_pref_chan);
	399	wpa_s->non_pref_chan = chans;
	400	wpa_s->non_pref_chan_num = num;
016082e9	401	wpas_mbo_non_pref_chan_changed(wpa_s);
92c6e2e3 DS	402
	403	return 0;
	404
	405	fail:
	406	os_free(chans);
	407	os_free(cmd);
	408	return -1;
	409	}
c5d193d7 DS	410
	411
	412	void wpas_mbo_scan_ie(struct wpa_supplicant wpa_s, struct wpabuf ie)
	413	{
332aadb8 AP	414	u8 *len;
332aadb8 AP	415
c5d193d7	416	wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
332aadb8 AP	417	len = wpabuf_put(ie, 1);
332aadb8 AP	418
c5d193d7 DS	419	wpabuf_put_be24(ie, OUI_WFA);
	420	wpabuf_put_u8(ie, MBO_OUI_TYPE);
	421
	422	wpabuf_put_u8(ie, MBO_ATTR_ID_CELL_DATA_CAPA);
	423	wpabuf_put_u8(ie, 1);
	424	wpabuf_put_u8(ie, wpa_s->conf->mbo_cell_capa);
332aadb8 AP	425	if (wpa_s->enable_oce & OCE_STA) {
	426	wpabuf_put_u8(ie, OCE_ATTR_ID_CAPA_IND);
	427	wpabuf_put_u8(ie, 1);
	428	wpabuf_put_u8(ie, OCE_RELEASE);
	429	}
	430	len = (u8 ) wpabuf_put(ie, 0) - len - 1;
c5d193d7	431	}
5e57ba25 AS	432
5e57ba25 AS	433
dd599908 AS	434	void wpas_mbo_ie_trans_req(struct wpa_supplicant wpa_s, const u8 mbo_ie,
	435	size_t len)
	436	{
af8bc24d	437	const u8 pos, cell_pref = NULL;
dd599908 AS	438	u8 id, elen;
	439	u16 disallowed_sec = 0;
	440
	441	if (len <= 4 \|\| WPA_GET_BE24(mbo_ie) != OUI_WFA \|\|
	442	mbo_ie[3] != MBO_OUI_TYPE)
	443	return;
	444
	445	pos = mbo_ie + 4;
	446	len -= 4;
	447
	448	while (len >= 2) {
	449	id = *pos++;
	450	elen = *pos++;
	451	len -= 2;
	452
	453	if (elen > len)
	454	goto fail;
	455
	456	switch (id) {
	457	case MBO_ATTR_ID_CELL_DATA_PREF:
	458	if (elen != 1)
	459	goto fail;
	460
	461	if (wpa_s->conf->mbo_cell_capa ==
	462	MBO_CELL_CAPA_AVAILABLE)
	463	cell_pref = pos;
	464	else
	465	wpa_printf(MSG_DEBUG,
	466	"MBO: Station does not support Cellular data connection");
	467	break;
	468	case MBO_ATTR_ID_TRANSITION_REASON:
	469	if (elen != 1)
	470	goto fail;
	471
af8bc24d KV	472	wpa_s->wnm_mbo_trans_reason_present = 1;
af8bc24d KV	473	wpa_s->wnm_mbo_transition_reason = *pos;
dd599908 AS	474	break;
	475	case MBO_ATTR_ID_ASSOC_RETRY_DELAY:
	476	if (elen != 2)
	477	goto fail;
	478
	479	if (wpa_s->wnm_mode &
	480	WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
	481	wpa_printf(MSG_DEBUG,
	482	"MBO: Unexpected association retry delay, BSS is terminating");
	483	goto fail;
	484	} else if (wpa_s->wnm_mode &
	485	WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
	486	disallowed_sec = WPA_GET_LE16(pos);
b04854ce AP	487	wpa_printf(MSG_DEBUG,
	488	"MBO: Association retry delay: %u",
	489	disallowed_sec);
dd599908 AS	490	} else {
	491	wpa_printf(MSG_DEBUG,
	492	"MBO: Association retry delay attribute not in disassoc imminent mode");
	493	}
	494
	495	break;
	496	case MBO_ATTR_ID_AP_CAPA_IND:
	497	case MBO_ATTR_ID_NON_PREF_CHAN_REPORT:
	498	case MBO_ATTR_ID_CELL_DATA_CAPA:
	499	case MBO_ATTR_ID_ASSOC_DISALLOW:
	500	case MBO_ATTR_ID_TRANSITION_REJECT_REASON:
	501	wpa_printf(MSG_DEBUG,
	502	"MBO: Attribute %d should not be included in BTM Request frame",
	503	id);
	504	break;
	505	default:
	506	wpa_printf(MSG_DEBUG, "MBO: Unknown attribute id %u",
	507	id);
	508	return;
	509	}
	510
	511	pos += elen;
	512	len -= elen;
	513	}
	514
	515	if (cell_pref)
	516	wpa_msg(wpa_s, MSG_INFO, MBO_CELL_PREFERENCE "preference=%u",
	517	*cell_pref);
	518
af8bc24d	519	if (wpa_s->wnm_mbo_trans_reason_present)
dd599908	520	wpa_msg(wpa_s, MSG_INFO, MBO_TRANSITION_REASON "reason=%u",
af8bc24d	521	wpa_s->wnm_mbo_transition_reason);
dd599908 AS	522
	523	if (disallowed_sec && wpa_s->current_bss)
	524	wpa_bss_tmp_disallow(wpa_s, wpa_s->current_bss->bssid,
19677b77	525	disallowed_sec, 0);
dd599908 AS	526
	527	return;
	528	fail:
	529	wpa_printf(MSG_DEBUG, "MBO IE parsing failed (id=%u len=%u left=%zu)",
	530	id, elen, len);
	531	}
c8082d2b AS	532
	533
	534	size_t wpas_mbo_ie_bss_trans_reject(struct wpa_supplicant wpa_s, u8 pos,
	535	size_t len,
	536	enum mbo_transition_reject_reason reason)
	537	{
	538	u8 reject_attr[3];
	539
	540	reject_attr[0] = MBO_ATTR_ID_TRANSITION_REJECT_REASON;
	541	reject_attr[1] = 1;
	542	reject_attr[2] = reason;
	543
	544	return mbo_add_ie(pos, len, reject_attr, sizeof(reject_attr));
	545	}
016082e9 AS	546
	547
	548	void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa)
	549	{
	550	u8 cell_capa[7];
	551
	552	if (wpa_s->conf->mbo_cell_capa == mbo_cell_capa) {
	553	wpa_printf(MSG_DEBUG,
	554	"MBO: Cellular capability already set to %u",
	555	mbo_cell_capa);
	556	return;
	557	}
	558
	559	wpa_s->conf->mbo_cell_capa = mbo_cell_capa;
	560
	561	cell_capa[0] = WLAN_EID_VENDOR_SPECIFIC;
	562	cell_capa[1] = 5; /* Length */
	563	WPA_PUT_BE24(cell_capa + 2, OUI_WFA);
	564	cell_capa[5] = MBO_ATTR_ID_CELL_DATA_CAPA;
	565	cell_capa[6] = mbo_cell_capa;
	566
	567	wpas_mbo_send_wnm_notification(wpa_s, cell_capa, 7);
cc9985d1	568	wpa_supplicant_set_default_scan_ies(wpa_s);
822c756e	569	wpas_update_mbo_connect_params(wpa_s);
016082e9	570	}
8f479174	571
	572
	573	struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
2316cb35	574	struct wpa_bss *bss, u32 mbo_subtypes)
8f479174	575	{
	576	struct wpabuf *anqp_buf;
	577	u8 *len_pos;
2316cb35	578	u8 i;
8f479174	579
	580	if (!wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE)) {
	581	wpa_printf(MSG_INFO, "MBO: " MACSTR
	582	" does not support MBO - cannot request MBO ANQP elements from it",
	583	MAC2STR(bss->bssid));
	584	return NULL;
	585	}
	586
2316cb35 AS	587	/* Allocate size for the maximum case - all MBO subtypes are set */
2316cb35 AS	588	anqp_buf = wpabuf_alloc(9 + MAX_MBO_ANQP_SUBTYPE);
8f479174	589	if (!anqp_buf)
	590	return NULL;
	591
	592	len_pos = gas_anqp_add_element(anqp_buf, ANQP_VENDOR_SPECIFIC);
	593	wpabuf_put_be24(anqp_buf, OUI_WFA);
	594	wpabuf_put_u8(anqp_buf, MBO_ANQP_OUI_TYPE);
	595
2316cb35 AS	596	wpabuf_put_u8(anqp_buf, MBO_ANQP_SUBTYPE_QUERY_LIST);
	597
	598	/* The first valid MBO subtype is 1 */
	599	for (i = 1; i <= MAX_MBO_ANQP_SUBTYPE; i++) {
	600	if (mbo_subtypes & BIT(i))
	601	wpabuf_put_u8(anqp_buf, i);
	602	}
	603
8f479174	604	gas_anqp_set_element_len(anqp_buf, len_pos);
	605
	606	return anqp_buf;
	607	}
34f28519 JM	608
	609
	610	void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
	611	struct wpa_bss bss, const u8 sa,
	612	const u8 *data, size_t slen)
	613	{
	614	const u8 *pos = data;
	615	u8 subtype;
	616
	617	if (slen < 1)
	618	return;
	619
	620	subtype = *pos++;
	621	slen--;
	622
	623	switch (subtype) {
	624	case MBO_ANQP_SUBTYPE_CELL_CONN_PREF:
	625	if (slen < 1)
	626	break;
	627	wpa_msg(wpa_s, MSG_INFO, RX_MBO_ANQP MACSTR
	628	" cell_conn_pref=%u", MAC2STR(sa), *pos);
	629	break;
	630	default:
	631	wpa_printf(MSG_DEBUG, "MBO: Unsupported ANQP subtype %u",
	632	subtype);
	633	break;
	634	}
	635	}