1 files changed, 714 insertions, 0 deletions

diff --git a/contrib/wpa/src/ap/gas_query_ap.c b/contrib/wpa/src/ap/gas_query_ap.c
new file mode 100644
index 0000000..fdb3cad
--- /dev/null
+++ b/contrib/wpa/src/ap/gas_query_ap.c
@@ -0,0 +1,714 @@
+/*
+ * Generic advertisement service (GAS) query (hostapd)
+ * Copyright (c) 2009, Atheros Communications
+ * Copyright (c) 2011-2017, Qualcomm Atheros, Inc.
+ * Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "utils/eloop.h"
+#include "utils/list.h"
+#include "common/ieee802_11_defs.h"
+#include "common/gas.h"
+#include "common/wpa_ctrl.h"
+#include "hostapd.h"
+#include "sta_info.h"
+#include "ap_drv_ops.h"
+#include "gas_query_ap.h"
+
+
+/** GAS query timeout in seconds */
+#define GAS_QUERY_TIMEOUT_PERIOD 2
+
+/* GAS query wait-time / duration in ms */
+#define GAS_QUERY_WAIT_TIME_INITIAL 1000
+#define GAS_QUERY_WAIT_TIME_COMEBACK 150
+
+/**
+ * struct gas_query_pending - Pending GAS query
+ */
+struct gas_query_pending {
+	struct dl_list list;
+	struct gas_query_ap *gas;
+	u8 addr[ETH_ALEN];
+	u8 dialog_token;
+	u8 next_frag_id;
+	unsigned int wait_comeback:1;
+	unsigned int offchannel_tx_started:1;
+	unsigned int retry:1;
+	int freq;
+	u16 status_code;
+	struct wpabuf *req;
+	struct wpabuf *adv_proto;
+	struct wpabuf *resp;
+	struct os_reltime last_oper;
+	void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
+		   enum gas_query_ap_result result,
+		   const struct wpabuf *adv_proto,
+		   const struct wpabuf *resp, u16 status_code);
+	void *ctx;
+	u8 sa[ETH_ALEN];
+};
+
+/**
+ * struct gas_query_ap - Internal GAS query data
+ */
+struct gas_query_ap {
+	struct hostapd_data *hapd;
+	void *msg_ctx;
+	struct dl_list pending; /* struct gas_query_pending */
+	struct gas_query_pending *current;
+};
+
+
+static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx);
+static void gas_query_timeout(void *eloop_data, void *user_ctx);
+static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx);
+static void gas_query_tx_initial_req(struct gas_query_ap *gas,
+				     struct gas_query_pending *query);
+static int gas_query_new_dialog_token(struct gas_query_ap *gas, const u8 *dst);
+
+
+static int ms_from_time(struct os_reltime *last)
+{
+	struct os_reltime now, res;
+
+	os_get_reltime(&now);
+	os_reltime_sub(&now, last, &res);
+	return res.sec * 1000 + res.usec / 1000;
+}
+
+
+/**
+ * gas_query_ap_init - Initialize GAS query component
+ * @hapd: Pointer to hostapd data
+ * Returns: Pointer to GAS query data or %NULL on failure
+ */
+struct gas_query_ap * gas_query_ap_init(struct hostapd_data *hapd,
+					void *msg_ctx)
+{
+	struct gas_query_ap *gas;
+
+	gas = os_zalloc(sizeof(*gas));
+	if (!gas)
+		return NULL;
+
+	gas->hapd = hapd;
+	gas->msg_ctx = msg_ctx;
+	dl_list_init(&gas->pending);
+
+	return gas;
+}
+
+
+static const char * gas_result_txt(enum gas_query_ap_result result)
+{
+	switch (result) {
+	case GAS_QUERY_AP_SUCCESS:
+		return "SUCCESS";
+	case GAS_QUERY_AP_FAILURE:
+		return "FAILURE";
+	case GAS_QUERY_AP_TIMEOUT:
+		return "TIMEOUT";
+	case GAS_QUERY_AP_PEER_ERROR:
+		return "PEER_ERROR";
+	case GAS_QUERY_AP_INTERNAL_ERROR:
+		return "INTERNAL_ERROR";
+	case GAS_QUERY_AP_DELETED_AT_DEINIT:
+		return "DELETED_AT_DEINIT";
+	}
+
+	return "N/A";
+}
+
+
+static void gas_query_free(struct gas_query_pending *query, int del_list)
+{
+	if (del_list)
+		dl_list_del(&query->list);
+
+	wpabuf_free(query->req);
+	wpabuf_free(query->adv_proto);
+	wpabuf_free(query->resp);
+	os_free(query);
+}
+
+
+static void gas_query_done(struct gas_query_ap *gas,
+			   struct gas_query_pending *query,
+			   enum gas_query_ap_result result)
+{
+	wpa_msg(gas->msg_ctx, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR
+		" dialog_token=%u freq=%d status_code=%u result=%s",
+		MAC2STR(query->addr), query->dialog_token, query->freq,
+		query->status_code, gas_result_txt(result));
+	if (gas->current == query)
+		gas->current = NULL;
+	eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
+	eloop_cancel_timeout(gas_query_timeout, gas, query);
+	eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
+	dl_list_del(&query->list);
+	query->cb(query->ctx, query->addr, query->dialog_token, result,
+		  query->adv_proto, query->resp, query->status_code);
+	gas_query_free(query, 0);
+}
+
+
+/**
+ * gas_query_ap_deinit - Deinitialize GAS query component
+ * @gas: GAS query data from gas_query_init()
+ */
+void gas_query_ap_deinit(struct gas_query_ap *gas)
+{
+	struct gas_query_pending *query, *next;
+
+	if (gas == NULL)
+		return;
+
+	dl_list_for_each_safe(query, next, &gas->pending,
+			      struct gas_query_pending, list)
+		gas_query_done(gas, query, GAS_QUERY_AP_DELETED_AT_DEINIT);
+
+	os_free(gas);
+}
+
+
+static struct gas_query_pending *
+gas_query_get_pending(struct gas_query_ap *gas, const u8 *addr, u8 dialog_token)
+{
+	struct gas_query_pending *q;
+	dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
+		if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 &&
+		    q->dialog_token == dialog_token)
+			return q;
+	}
+	return NULL;
+}
+
+
+static int gas_query_append(struct gas_query_pending *query, const u8 *data,
+			    size_t len)
+{
+	if (wpabuf_resize(&query->resp, len) < 0) {
+		wpa_printf(MSG_DEBUG, "GAS: No memory to store the response");
+		return -1;
+	}
+	wpabuf_put_data(query->resp, data, len);
+	return 0;
+}
+
+
+void gas_query_ap_tx_status(struct gas_query_ap *gas, const u8 *dst,
+			    const u8 *data, size_t data_len, int ok)
+{
+	struct gas_query_pending *query;
+	int dur;
+
+	if (!gas || !gas->current) {
+		wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: dst=" MACSTR
+			   " ok=%d - no query in progress", MAC2STR(dst), ok);
+		return;
+	}
+
+	query = gas->current;
+
+	dur = ms_from_time(&query->last_oper);
+	wpa_printf(MSG_DEBUG, "GAS: TX status: dst=" MACSTR
+		   " ok=%d query=%p dialog_token=%u dur=%d ms",
+		   MAC2STR(dst), ok, query, query->dialog_token, dur);
+	if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) {
+		wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination");
+		return;
+	}
+	os_get_reltime(&query->last_oper);
+
+	eloop_cancel_timeout(gas_query_timeout, gas, query);
+	if (!ok) {
+		wpa_printf(MSG_DEBUG, "GAS: No ACK to GAS request");
+		eloop_register_timeout(0, 250000, gas_query_timeout,
+				       gas, query);
+	} else {
+		eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
+				       gas_query_timeout, gas, query);
+	}
+	if (query->wait_comeback && !query->retry) {
+		eloop_cancel_timeout(gas_query_rx_comeback_timeout,
+				     gas, query);
+		eloop_register_timeout(
+			0, (GAS_QUERY_WAIT_TIME_COMEBACK + 10) * 1000,
+			gas_query_rx_comeback_timeout, gas, query);
+	}
+}
+
+
+static int pmf_in_use(struct hostapd_data *hapd, const u8 *addr)
+{
+	struct sta_info *sta;
+
+	sta = ap_get_sta(hapd, addr);
+	return sta && (sta->flags & WLAN_STA_MFP);
+}
+
+
+static int gas_query_tx(struct gas_query_ap *gas,
+			struct gas_query_pending *query,
+			struct wpabuf *req, unsigned int wait_time)
+{
+	int res, prot = pmf_in_use(gas->hapd, query->addr);
+
+	wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u "
+		   "freq=%d prot=%d using src addr " MACSTR,
+		   MAC2STR(query->addr), (unsigned int) wpabuf_len(req),
+		   query->freq, prot, MAC2STR(query->sa));
+	if (prot) {
+		u8 *categ = wpabuf_mhead_u8(req);
+		*categ = WLAN_ACTION_PROTECTED_DUAL;
+	}
+	os_get_reltime(&query->last_oper);
+	res = hostapd_drv_send_action(gas->hapd, query->freq, wait_time,
+				      query->addr, wpabuf_head(req),
+				      wpabuf_len(req));
+	return res;
+}
+
+
+static void gas_query_tx_comeback_req(struct gas_query_ap *gas,
+				      struct gas_query_pending *query)
+{
+	struct wpabuf *req;
+	unsigned int wait_time;
+
+	req = gas_build_comeback_req(query->dialog_token);
+	if (req == NULL) {
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+		return;
+	}
+
+	wait_time = (query->retry || !query->offchannel_tx_started) ?
+		GAS_QUERY_WAIT_TIME_INITIAL : GAS_QUERY_WAIT_TIME_COMEBACK;
+
+	if (gas_query_tx(gas, query, req, wait_time) < 0) {
+		wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
+			   MACSTR, MAC2STR(query->addr));
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+	}
+
+	wpabuf_free(req);
+}
+
+
+static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx)
+{
+	struct gas_query_ap *gas = eloop_data;
+	struct gas_query_pending *query = user_ctx;
+	int dialog_token;
+
+	wpa_printf(MSG_DEBUG,
+		   "GAS: No response to comeback request received (retry=%u)",
+		   query->retry);
+	if (gas->current != query || query->retry)
+		return;
+	dialog_token = gas_query_new_dialog_token(gas, query->addr);
+	if (dialog_token < 0)
+		return;
+	wpa_printf(MSG_DEBUG,
+		   "GAS: Retry GAS query due to comeback response timeout");
+	query->retry = 1;
+	query->dialog_token = dialog_token;
+	*(wpabuf_mhead_u8(query->req) + 2) = dialog_token;
+	query->wait_comeback = 0;
+	query->next_frag_id = 0;
+	wpabuf_free(query->adv_proto);
+	query->adv_proto = NULL;
+	eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
+	eloop_cancel_timeout(gas_query_timeout, gas, query);
+	gas_query_tx_initial_req(gas, query);
+}
+
+
+static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx)
+{
+	struct gas_query_ap *gas = eloop_data;
+	struct gas_query_pending *query = user_ctx;
+
+	wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR,
+		   MAC2STR(query->addr));
+	gas_query_tx_comeback_req(gas, query);
+}
+
+
+static void gas_query_tx_comeback_req_delay(struct gas_query_ap *gas,
+					    struct gas_query_pending *query,
+					    u16 comeback_delay)
+{
+	unsigned int secs, usecs;
+
+	secs = (comeback_delay * 1024) / 1000000;
+	usecs = comeback_delay * 1024 - secs * 1000000;
+	wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR
+		   " in %u secs %u usecs", MAC2STR(query->addr), secs, usecs);
+	eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
+	eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout,
+			       gas, query);
+}
+
+
+static void gas_query_rx_initial(struct gas_query_ap *gas,
+				 struct gas_query_pending *query,
+				 const u8 *adv_proto, const u8 *resp,
+				 size_t len, u16 comeback_delay)
+{
+	wpa_printf(MSG_DEBUG, "GAS: Received initial response from "
+		   MACSTR " (dialog_token=%u comeback_delay=%u)",
+		   MAC2STR(query->addr), query->dialog_token, comeback_delay);
+
+	query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]);
+	if (query->adv_proto == NULL) {
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+		return;
+	}
+
+	if (comeback_delay) {
+		eloop_cancel_timeout(gas_query_timeout, gas, query);
+		query->wait_comeback = 1;
+		gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
+		return;
+	}
+
+	/* Query was completed without comeback mechanism */
+	if (gas_query_append(query, resp, len) < 0) {
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+		return;
+	}
+
+	gas_query_done(gas, query, GAS_QUERY_AP_SUCCESS);
+}
+
+
+static void gas_query_rx_comeback(struct gas_query_ap *gas,
+				  struct gas_query_pending *query,
+				  const u8 *adv_proto, const u8 *resp,
+				  size_t len, u8 frag_id, u8 more_frags,
+				  u16 comeback_delay)
+{
+	wpa_printf(MSG_DEBUG, "GAS: Received comeback response from "
+		   MACSTR " (dialog_token=%u frag_id=%u more_frags=%u "
+		   "comeback_delay=%u)",
+		   MAC2STR(query->addr), query->dialog_token, frag_id,
+		   more_frags, comeback_delay);
+	eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
+
+	if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) ||
+	    os_memcmp(adv_proto, wpabuf_head(query->adv_proto),
+		      wpabuf_len(query->adv_proto)) != 0) {
+		wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed "
+			   "between initial and comeback response from "
+			   MACSTR, MAC2STR(query->addr));
+		gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
+		return;
+	}
+
+	if (comeback_delay) {
+		if (frag_id) {
+			wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response "
+				   "with non-zero frag_id and comeback_delay "
+				   "from " MACSTR, MAC2STR(query->addr));
+			gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
+			return;
+		}
+		gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
+		return;
+	}
+
+	if (frag_id != query->next_frag_id) {
+		wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response "
+			   "from " MACSTR, MAC2STR(query->addr));
+		if (frag_id + 1 == query->next_frag_id) {
+			wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible "
+				   "retry of previous fragment");
+			return;
+		}
+		gas_query_done(gas, query, GAS_QUERY_AP_PEER_ERROR);
+		return;
+	}
+	query->next_frag_id++;
+
+	if (gas_query_append(query, resp, len) < 0) {
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+		return;
+	}
+
+	if (more_frags) {
+		gas_query_tx_comeback_req(gas, query);
+		return;
+	}
+
+	gas_query_done(gas, query, GAS_QUERY_AP_SUCCESS);
+}
+
+
+/**
+ * gas_query_ap_rx - Indicate reception of a Public Action or Protected Dual
+ *	frame
+ * @gas: GAS query data from gas_query_init()
+ * @sa: Source MAC address of the Action frame
+ * @categ: Category of the Action frame
+ * @data: Payload of the Action frame
+ * @len: Length of @data
+ * @freq: Frequency (in MHz) on which the frame was received
+ * Returns: 0 if the Public Action frame was a GAS frame or -1 if not
+ */
+int gas_query_ap_rx(struct gas_query_ap *gas, const u8 *sa, u8 categ,
+		    const u8 *data, size_t len, int freq)
+{
+	struct gas_query_pending *query;
+	u8 action, dialog_token, frag_id = 0, more_frags = 0;
+	u16 comeback_delay, resp_len;
+	const u8 *pos, *adv_proto;
+	int prot, pmf;
+	unsigned int left;
+
+	if (!gas || len < 4)
+		return -1;
+
+	pos = data;
+	action = *pos++;
+	dialog_token = *pos++;
+
+	if (action != WLAN_PA_GAS_INITIAL_RESP &&
+	    action != WLAN_PA_GAS_COMEBACK_RESP)
+		return -1; /* Not a GAS response */
+
+	prot = categ == WLAN_ACTION_PROTECTED_DUAL;
+	pmf = pmf_in_use(gas->hapd, sa);
+	if (prot && !pmf) {
+		wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled");
+		return 0;
+	}
+	if (!prot && pmf) {
+		wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled");
+		return 0;
+	}
+
+	query = gas_query_get_pending(gas, sa, dialog_token);
+	if (query == NULL) {
+		wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR
+			   " dialog token %u", MAC2STR(sa), dialog_token);
+		return -1;
+	}
+
+	wpa_printf(MSG_DEBUG, "GAS: Response in %d ms from " MACSTR,
+		   ms_from_time(&query->last_oper), MAC2STR(sa));
+
+	if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) {
+		wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from "
+			   MACSTR " dialog token %u when waiting for comeback "
+			   "response", MAC2STR(sa), dialog_token);
+		return 0;
+	}
+
+	if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) {
+		wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from "
+			   MACSTR " dialog token %u when waiting for initial "
+			   "response", MAC2STR(sa), dialog_token);
+		return 0;
+	}
+
+	query->status_code = WPA_GET_LE16(pos);
+	pos += 2;
+
+	if (query->status_code == WLAN_STATUS_QUERY_RESP_OUTSTANDING &&
+	    action == WLAN_PA_GAS_COMEBACK_RESP) {
+		wpa_printf(MSG_DEBUG, "GAS: Allow non-zero status for outstanding comeback response");
+	} else if (query->status_code != WLAN_STATUS_SUCCESS) {
+		wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token "
+			   "%u failed - status code %u",
+			   MAC2STR(sa), dialog_token, query->status_code);
+		gas_query_done(gas, query, GAS_QUERY_AP_FAILURE);
+		return 0;
+	}
+
+	if (action == WLAN_PA_GAS_COMEBACK_RESP) {
+		if (pos + 1 > data + len)
+			return 0;
+		frag_id = *pos & 0x7f;
+		more_frags = (*pos & 0x80) >> 7;
+		pos++;
+	}
+
+	/* Comeback Delay */
+	if (pos + 2 > data + len)
+		return 0;
+	comeback_delay = WPA_GET_LE16(pos);
+	pos += 2;
+
+	/* Advertisement Protocol element */
+	if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) {
+		wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement "
+			   "Protocol element in the response from " MACSTR,
+			   MAC2STR(sa));
+		return 0;
+	}
+
+	if (*pos != WLAN_EID_ADV_PROTO) {
+		wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement "
+			   "Protocol element ID %u in response from " MACSTR,
+			   *pos, MAC2STR(sa));
+		return 0;
+	}
+
+	adv_proto = pos;
+	pos += 2 + pos[1];
+
+	/* Query Response Length */
+	if (pos + 2 > data + len) {
+		wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length");
+		return 0;
+	}
+	resp_len = WPA_GET_LE16(pos);
+	pos += 2;
+
+	left = data + len - pos;
+	if (resp_len > left) {
+		wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in "
+			   "response from " MACSTR, MAC2STR(sa));
+		return 0;
+	}
+
+	if (resp_len < left) {
+		wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data "
+			   "after Query Response from " MACSTR,
+			   left - resp_len, MAC2STR(sa));
+	}
+
+	if (action == WLAN_PA_GAS_COMEBACK_RESP)
+		gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len,
+				      frag_id, more_frags, comeback_delay);
+	else
+		gas_query_rx_initial(gas, query, adv_proto, pos, resp_len,
+				     comeback_delay);
+
+	return 0;
+}
+
+
+static void gas_query_timeout(void *eloop_data, void *user_ctx)
+{
+	struct gas_query_ap *gas = eloop_data;
+	struct gas_query_pending *query = user_ctx;
+
+	wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR
+		   " dialog token %u",
+		   MAC2STR(query->addr), query->dialog_token);
+	gas_query_done(gas, query, GAS_QUERY_AP_TIMEOUT);
+}
+
+
+static int gas_query_dialog_token_available(struct gas_query_ap *gas,
+					    const u8 *dst, u8 dialog_token)
+{
+	struct gas_query_pending *q;
+	dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
+		if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 &&
+		    dialog_token == q->dialog_token)
+			return 0;
+	}
+
+	return 1;
+}
+
+
+static void gas_query_tx_initial_req(struct gas_query_ap *gas,
+				     struct gas_query_pending *query)
+{
+	if (gas_query_tx(gas, query, query->req,
+			 GAS_QUERY_WAIT_TIME_INITIAL) < 0) {
+		wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
+			   MACSTR, MAC2STR(query->addr));
+		gas_query_done(gas, query, GAS_QUERY_AP_INTERNAL_ERROR);
+		return;
+	}
+	gas->current = query;
+
+	wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u",
+		   query->dialog_token);
+	eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
+			       gas_query_timeout, gas, query);
+}
+
+
+static int gas_query_new_dialog_token(struct gas_query_ap *gas, const u8 *dst)
+{
+	static int next_start = 0;
+	int dialog_token;
+
+	for (dialog_token = 0; dialog_token < 256; dialog_token++) {
+		if (gas_query_dialog_token_available(
+			    gas, dst, (next_start + dialog_token) % 256))
+			break;
+	}
+	if (dialog_token == 256)
+		return -1; /* Too many pending queries */
+	dialog_token = (next_start + dialog_token) % 256;
+	next_start = (dialog_token + 1) % 256;
+	return dialog_token;
+}
+
+
+/**
+ * gas_query_ap_req - Request a GAS query
+ * @gas: GAS query data from gas_query_init()
+ * @dst: Destination MAC address for the query
+ * @freq: Frequency (in MHz) for the channel on which to send the query
+ * @req: GAS query payload (to be freed by gas_query module in case of success
+ *	return)
+ * @cb: Callback function for reporting GAS query result and response
+ * @ctx: Context pointer to use with the @cb call
+ * Returns: dialog token (>= 0) on success or -1 on failure
+ */
+int gas_query_ap_req(struct gas_query_ap *gas, const u8 *dst, int freq,
+		     struct wpabuf *req,
+		     void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
+				enum gas_query_ap_result result,
+				const struct wpabuf *adv_proto,
+				const struct wpabuf *resp, u16 status_code),
+		     void *ctx)
+{
+	struct gas_query_pending *query;
+	int dialog_token;
+
+	if (!gas || wpabuf_len(req) < 3)
+		return -1;
+
+	dialog_token = gas_query_new_dialog_token(gas, dst);
+	if (dialog_token < 0)
+		return -1;
+
+	query = os_zalloc(sizeof(*query));
+	if (query == NULL)
+		return -1;
+
+	query->gas = gas;
+	os_memcpy(query->addr, dst, ETH_ALEN);
+	query->dialog_token = dialog_token;
+	query->freq = freq;
+	query->cb = cb;
+	query->ctx = ctx;
+	query->req = req;
+	dl_list_add(&gas->pending, &query->list);
+
+	*(wpabuf_mhead_u8(req) + 2) = dialog_token;
+
+	wpa_msg(gas->msg_ctx, MSG_INFO, GAS_QUERY_START "addr=" MACSTR
+		" dialog_token=%u freq=%d",
+		MAC2STR(query->addr), query->dialog_token, query->freq);
+
+	gas_query_tx_initial_req(gas, query);
+
+	return dialog_token;
+}