2 * Generic advertisement service (GAS) query
3 * Copyright (c) 2009, Atheros Communications
4 * Copyright (c) 2011-2014, Qualcomm Atheros, Inc.
5 * Copyright (c) 2011-2014, Jouni Malinen <j@w1.fi>
7 * This software may be distributed under the terms of the BSD license.
8 * See README for more details.
14 #include "utils/eloop.h"
15 #include "common/ieee802_11_defs.h"
16 #include "common/gas.h"
17 #include "common/wpa_ctrl.h"
18 #include "rsn_supp/wpa.h"
19 #include "wpa_supplicant_i.h"
22 #include "offchannel.h"
23 #include "gas_query.h"
26 /** GAS query timeout in seconds */
27 #define GAS_QUERY_TIMEOUT_PERIOD 2
29 /* GAS query wait-time / duration in ms */
30 #define GAS_QUERY_WAIT_TIME_INITIAL 1000
31 #define GAS_QUERY_WAIT_TIME_COMEBACK 150
34 * struct gas_query_pending - Pending GAS query
36 struct gas_query_pending {
38 struct gas_query *gas;
42 unsigned int wait_comeback:1;
43 unsigned int offchannel_tx_started:1;
45 unsigned int wildcard_bssid:1;
49 struct wpabuf *adv_proto;
51 struct os_reltime last_oper;
52 void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
53 enum gas_query_result result,
54 const struct wpabuf *adv_proto,
55 const struct wpabuf *resp, u16 status_code);
61 * struct gas_query - Internal GAS query data
64 struct wpa_supplicant *wpa_s;
65 struct dl_list pending; /* struct gas_query_pending */
66 struct gas_query_pending *current;
67 struct wpa_radio_work *work;
68 struct os_reltime last_mac_addr_rand;
69 int last_rand_sa_type;
70 u8 rand_addr[ETH_ALEN];
74 static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx);
75 static void gas_query_timeout(void *eloop_data, void *user_ctx);
76 static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx);
77 static void gas_query_tx_initial_req(struct gas_query *gas,
78 struct gas_query_pending *query);
79 static int gas_query_new_dialog_token(struct gas_query *gas, const u8 *dst);
82 static int ms_from_time(struct os_reltime *last)
84 struct os_reltime now, res;
87 os_reltime_sub(&now, last, &res);
88 return res.sec * 1000 + res.usec / 1000;
93 * gas_query_init - Initialize GAS query component
94 * @wpa_s: Pointer to wpa_supplicant data
95 * Returns: Pointer to GAS query data or %NULL on failure
97 struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s)
99 struct gas_query *gas;
101 gas = os_zalloc(sizeof(*gas));
106 dl_list_init(&gas->pending);
112 static const char * gas_result_txt(enum gas_query_result result)
115 case GAS_QUERY_SUCCESS:
117 case GAS_QUERY_FAILURE:
119 case GAS_QUERY_TIMEOUT:
121 case GAS_QUERY_PEER_ERROR:
123 case GAS_QUERY_INTERNAL_ERROR:
124 return "INTERNAL_ERROR";
125 case GAS_QUERY_STOPPED:
127 case GAS_QUERY_DELETED_AT_DEINIT:
128 return "DELETED_AT_DEINIT";
135 static void gas_query_free(struct gas_query_pending *query, int del_list)
137 struct gas_query *gas = query->gas;
140 dl_list_del(&query->list);
142 if (gas->work && gas->work->ctx == query) {
143 radio_work_done(gas->work);
147 wpabuf_free(query->req);
148 wpabuf_free(query->adv_proto);
149 wpabuf_free(query->resp);
154 static void gas_query_done(struct gas_query *gas,
155 struct gas_query_pending *query,
156 enum gas_query_result result)
158 wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR
159 " dialog_token=%u freq=%d status_code=%u result=%s",
160 MAC2STR(query->addr), query->dialog_token, query->freq,
161 query->status_code, gas_result_txt(result));
162 if (gas->current == query)
164 if (query->offchannel_tx_started)
165 offchannel_send_action_done(gas->wpa_s);
166 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
167 eloop_cancel_timeout(gas_query_timeout, gas, query);
168 eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
169 dl_list_del(&query->list);
170 query->cb(query->ctx, query->addr, query->dialog_token, result,
171 query->adv_proto, query->resp, query->status_code);
172 gas_query_free(query, 0);
177 * gas_query_deinit - Deinitialize GAS query component
178 * @gas: GAS query data from gas_query_init()
180 void gas_query_deinit(struct gas_query *gas)
182 struct gas_query_pending *query, *next;
187 dl_list_for_each_safe(query, next, &gas->pending,
188 struct gas_query_pending, list)
189 gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT);
195 static struct gas_query_pending *
196 gas_query_get_pending(struct gas_query *gas, const u8 *addr, u8 dialog_token)
198 struct gas_query_pending *q;
199 dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
200 if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 &&
201 q->dialog_token == dialog_token)
208 static int gas_query_append(struct gas_query_pending *query, const u8 *data,
211 if (wpabuf_resize(&query->resp, len) < 0) {
212 wpa_printf(MSG_DEBUG, "GAS: No memory to store the response");
215 wpabuf_put_data(query->resp, data, len);
220 static void gas_query_tx_status(struct wpa_supplicant *wpa_s,
221 unsigned int freq, const u8 *dst,
222 const u8 *src, const u8 *bssid,
223 const u8 *data, size_t data_len,
224 enum offchannel_send_action_result result)
226 struct gas_query_pending *query;
227 struct gas_query *gas = wpa_s->gas;
230 if (gas->current == NULL) {
231 wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: freq=%u dst="
232 MACSTR " result=%d - no query in progress",
233 freq, MAC2STR(dst), result);
237 query = gas->current;
239 dur = ms_from_time(&query->last_oper);
240 wpa_printf(MSG_DEBUG, "GAS: TX status: freq=%u dst=" MACSTR
241 " result=%d query=%p dialog_token=%u dur=%d ms",
242 freq, MAC2STR(dst), result, query, query->dialog_token, dur);
243 if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) {
244 wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination");
247 os_get_reltime(&query->last_oper);
249 if (result == OFFCHANNEL_SEND_ACTION_SUCCESS ||
250 result == OFFCHANNEL_SEND_ACTION_NO_ACK) {
251 eloop_cancel_timeout(gas_query_timeout, gas, query);
252 if (result == OFFCHANNEL_SEND_ACTION_NO_ACK) {
253 wpa_printf(MSG_DEBUG, "GAS: No ACK to GAS request");
254 eloop_register_timeout(0, 250000,
255 gas_query_timeout, gas, query);
257 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
258 gas_query_timeout, gas, query);
260 if (query->wait_comeback && !query->retry) {
261 eloop_cancel_timeout(gas_query_rx_comeback_timeout,
263 eloop_register_timeout(
264 0, (GAS_QUERY_WAIT_TIME_COMEBACK + 10) * 1000,
265 gas_query_rx_comeback_timeout, gas, query);
268 if (result == OFFCHANNEL_SEND_ACTION_FAILED) {
269 eloop_cancel_timeout(gas_query_timeout, gas, query);
270 eloop_register_timeout(0, 0, gas_query_timeout, gas, query);
275 int pmf_in_use(struct wpa_supplicant *wpa_s, const u8 *addr)
277 if (wpa_s->current_ssid == NULL ||
278 wpa_s->wpa_state < WPA_4WAY_HANDSHAKE ||
279 os_memcmp(addr, wpa_s->bssid, ETH_ALEN) != 0)
281 return wpa_sm_pmf_enabled(wpa_s->wpa);
285 static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query,
286 struct wpabuf *req, unsigned int wait_time)
288 int res, prot = pmf_in_use(gas->wpa_s, query->addr);
290 const u8 wildcard_bssid[ETH_ALEN] = {
291 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
294 wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u "
295 "freq=%d prot=%d using src addr " MACSTR,
296 MAC2STR(query->addr), (unsigned int) wpabuf_len(req),
297 query->freq, prot, MAC2STR(query->sa));
299 u8 *categ = wpabuf_mhead_u8(req);
300 *categ = WLAN_ACTION_PROTECTED_DUAL;
302 os_get_reltime(&query->last_oper);
303 if (gas->wpa_s->max_remain_on_chan &&
304 wait_time > gas->wpa_s->max_remain_on_chan)
305 wait_time = gas->wpa_s->max_remain_on_chan;
306 if (!query->wildcard_bssid &&
307 (!gas->wpa_s->conf->gas_address3 ||
308 (gas->wpa_s->current_ssid &&
309 gas->wpa_s->wpa_state >= WPA_ASSOCIATED &&
310 os_memcmp(query->addr, gas->wpa_s->bssid, ETH_ALEN) == 0)))
313 bssid = wildcard_bssid;
315 res = offchannel_send_action(gas->wpa_s, query->freq, query->addr,
316 query->sa, bssid, wpabuf_head(req),
317 wpabuf_len(req), wait_time,
318 gas_query_tx_status, 0);
321 query->offchannel_tx_started = 1;
326 static void gas_query_tx_comeback_req(struct gas_query *gas,
327 struct gas_query_pending *query)
330 unsigned int wait_time;
332 req = gas_build_comeback_req(query->dialog_token);
334 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
338 wait_time = (query->retry || !query->offchannel_tx_started) ?
339 GAS_QUERY_WAIT_TIME_INITIAL : GAS_QUERY_WAIT_TIME_COMEBACK;
341 if (gas_query_tx(gas, query, req, wait_time) < 0) {
342 wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
343 MACSTR, MAC2STR(query->addr));
344 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
351 static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx)
353 struct gas_query *gas = eloop_data;
354 struct gas_query_pending *query = user_ctx;
357 wpa_printf(MSG_DEBUG,
358 "GAS: No response to comeback request received (retry=%u)",
360 if (gas->current != query || query->retry)
362 dialog_token = gas_query_new_dialog_token(gas, query->addr);
363 if (dialog_token < 0)
365 wpa_printf(MSG_DEBUG,
366 "GAS: Retry GAS query due to comeback response timeout");
368 query->dialog_token = dialog_token;
369 *(wpabuf_mhead_u8(query->req) + 2) = dialog_token;
370 query->wait_comeback = 0;
371 query->next_frag_id = 0;
372 wpabuf_free(query->adv_proto);
373 query->adv_proto = NULL;
374 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
375 eloop_cancel_timeout(gas_query_timeout, gas, query);
376 gas_query_tx_initial_req(gas, query);
380 static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx)
382 struct gas_query *gas = eloop_data;
383 struct gas_query_pending *query = user_ctx;
385 wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR,
386 MAC2STR(query->addr));
387 gas_query_tx_comeback_req(gas, query);
391 static void gas_query_tx_comeback_req_delay(struct gas_query *gas,
392 struct gas_query_pending *query,
395 unsigned int secs, usecs;
397 if (comeback_delay > 1 && query->offchannel_tx_started) {
398 offchannel_send_action_done(gas->wpa_s);
399 query->offchannel_tx_started = 0;
402 secs = (comeback_delay * 1024) / 1000000;
403 usecs = comeback_delay * 1024 - secs * 1000000;
404 wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR
405 " in %u secs %u usecs", MAC2STR(query->addr), secs, usecs);
406 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query);
407 eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout,
412 static void gas_query_rx_initial(struct gas_query *gas,
413 struct gas_query_pending *query,
414 const u8 *adv_proto, const u8 *resp,
415 size_t len, u16 comeback_delay)
417 wpa_printf(MSG_DEBUG, "GAS: Received initial response from "
418 MACSTR " (dialog_token=%u comeback_delay=%u)",
419 MAC2STR(query->addr), query->dialog_token, comeback_delay);
421 query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]);
422 if (query->adv_proto == NULL) {
423 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
427 if (comeback_delay) {
428 eloop_cancel_timeout(gas_query_timeout, gas, query);
429 query->wait_comeback = 1;
430 gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
434 /* Query was completed without comeback mechanism */
435 if (gas_query_append(query, resp, len) < 0) {
436 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
440 gas_query_done(gas, query, GAS_QUERY_SUCCESS);
444 static void gas_query_rx_comeback(struct gas_query *gas,
445 struct gas_query_pending *query,
446 const u8 *adv_proto, const u8 *resp,
447 size_t len, u8 frag_id, u8 more_frags,
450 wpa_printf(MSG_DEBUG, "GAS: Received comeback response from "
451 MACSTR " (dialog_token=%u frag_id=%u more_frags=%u "
452 "comeback_delay=%u)",
453 MAC2STR(query->addr), query->dialog_token, frag_id,
454 more_frags, comeback_delay);
455 eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query);
457 if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) ||
458 os_memcmp(adv_proto, wpabuf_head(query->adv_proto),
459 wpabuf_len(query->adv_proto)) != 0) {
460 wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed "
461 "between initial and comeback response from "
462 MACSTR, MAC2STR(query->addr));
463 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
467 if (comeback_delay) {
469 wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response "
470 "with non-zero frag_id and comeback_delay "
471 "from " MACSTR, MAC2STR(query->addr));
472 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
475 gas_query_tx_comeback_req_delay(gas, query, comeback_delay);
479 if (frag_id != query->next_frag_id) {
480 wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response "
481 "from " MACSTR, MAC2STR(query->addr));
482 if (frag_id + 1 == query->next_frag_id) {
483 wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible "
484 "retry of previous fragment");
487 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR);
490 query->next_frag_id++;
492 if (gas_query_append(query, resp, len) < 0) {
493 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
498 gas_query_tx_comeback_req(gas, query);
502 gas_query_done(gas, query, GAS_QUERY_SUCCESS);
507 * gas_query_rx - Indicate reception of a Public Action or Protected Dual frame
508 * @gas: GAS query data from gas_query_init()
509 * @da: Destination MAC address of the Action frame
510 * @sa: Source MAC address of the Action frame
511 * @bssid: BSSID of the Action frame
512 * @categ: Category of the Action frame
513 * @data: Payload of the Action frame
514 * @len: Length of @data
515 * @freq: Frequency (in MHz) on which the frame was received
516 * Returns: 0 if the Public Action frame was a GAS frame or -1 if not
518 int gas_query_rx(struct gas_query *gas, const u8 *da, const u8 *sa,
519 const u8 *bssid, u8 categ, const u8 *data, size_t len,
522 struct gas_query_pending *query;
523 u8 action, dialog_token, frag_id = 0, more_frags = 0;
524 u16 comeback_delay, resp_len;
525 const u8 *pos, *adv_proto;
529 if (gas == NULL || len < 4)
534 dialog_token = *pos++;
536 if (action != WLAN_PA_GAS_INITIAL_RESP &&
537 action != WLAN_PA_GAS_COMEBACK_RESP)
538 return -1; /* Not a GAS response */
540 prot = categ == WLAN_ACTION_PROTECTED_DUAL;
541 pmf = pmf_in_use(gas->wpa_s, sa);
543 wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled");
547 wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled");
551 query = gas_query_get_pending(gas, sa, dialog_token);
553 wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR
554 " dialog token %u", MAC2STR(sa), dialog_token);
558 wpa_printf(MSG_DEBUG, "GAS: Response in %d ms from " MACSTR,
559 ms_from_time(&query->last_oper), MAC2STR(sa));
561 if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) {
562 wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from "
563 MACSTR " dialog token %u when waiting for comeback "
564 "response", MAC2STR(sa), dialog_token);
568 if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) {
569 wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from "
570 MACSTR " dialog token %u when waiting for initial "
571 "response", MAC2STR(sa), dialog_token);
575 query->status_code = WPA_GET_LE16(pos);
578 if (query->status_code == WLAN_STATUS_QUERY_RESP_OUTSTANDING &&
579 action == WLAN_PA_GAS_COMEBACK_RESP) {
580 wpa_printf(MSG_DEBUG, "GAS: Allow non-zero status for outstanding comeback response");
581 } else if (query->status_code != WLAN_STATUS_SUCCESS) {
582 wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token "
583 "%u failed - status code %u",
584 MAC2STR(sa), dialog_token, query->status_code);
585 gas_query_done(gas, query, GAS_QUERY_FAILURE);
589 if (action == WLAN_PA_GAS_COMEBACK_RESP) {
590 if (pos + 1 > data + len)
592 frag_id = *pos & 0x7f;
593 more_frags = (*pos & 0x80) >> 7;
598 if (pos + 2 > data + len)
600 comeback_delay = WPA_GET_LE16(pos);
603 /* Advertisement Protocol element */
604 if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) {
605 wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement "
606 "Protocol element in the response from " MACSTR,
611 if (*pos != WLAN_EID_ADV_PROTO) {
612 wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement "
613 "Protocol element ID %u in response from " MACSTR,
621 /* Query Response Length */
622 if (pos + 2 > data + len) {
623 wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length");
626 resp_len = WPA_GET_LE16(pos);
629 left = data + len - pos;
630 if (resp_len > left) {
631 wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in "
632 "response from " MACSTR, MAC2STR(sa));
636 if (resp_len < left) {
637 wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data "
638 "after Query Response from " MACSTR,
639 left - resp_len, MAC2STR(sa));
642 if (action == WLAN_PA_GAS_COMEBACK_RESP)
643 gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len,
644 frag_id, more_frags, comeback_delay);
646 gas_query_rx_initial(gas, query, adv_proto, pos, resp_len,
653 static void gas_query_timeout(void *eloop_data, void *user_ctx)
655 struct gas_query *gas = eloop_data;
656 struct gas_query_pending *query = user_ctx;
658 wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR
660 MAC2STR(query->addr), query->dialog_token);
661 gas_query_done(gas, query, GAS_QUERY_TIMEOUT);
665 static int gas_query_dialog_token_available(struct gas_query *gas,
666 const u8 *dst, u8 dialog_token)
668 struct gas_query_pending *q;
669 dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) {
670 if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 &&
671 dialog_token == q->dialog_token)
679 static void gas_query_start_cb(struct wpa_radio_work *work, int deinit)
681 struct gas_query_pending *query = work->ctx;
682 struct gas_query *gas = query->gas;
683 struct wpa_supplicant *wpa_s = gas->wpa_s;
688 gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT);
692 gas_query_free(query, 1);
696 if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
697 wpa_msg(wpa_s, MSG_INFO,
698 "Failed to assign random MAC address for GAS");
699 gas_query_free(query, 1);
700 radio_work_done(work);
705 gas_query_tx_initial_req(gas, query);
709 static void gas_query_tx_initial_req(struct gas_query *gas,
710 struct gas_query_pending *query)
712 if (gas_query_tx(gas, query, query->req,
713 GAS_QUERY_WAIT_TIME_INITIAL) < 0) {
714 wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to "
715 MACSTR, MAC2STR(query->addr));
716 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR);
719 gas->current = query;
721 wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u",
722 query->dialog_token);
723 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0,
724 gas_query_timeout, gas, query);
728 static int gas_query_new_dialog_token(struct gas_query *gas, const u8 *dst)
730 static int next_start = 0;
733 for (dialog_token = 0; dialog_token < 256; dialog_token++) {
734 if (gas_query_dialog_token_available(
735 gas, dst, (next_start + dialog_token) % 256))
738 if (dialog_token == 256)
739 return -1; /* Too many pending queries */
740 dialog_token = (next_start + dialog_token) % 256;
741 next_start = (dialog_token + 1) % 256;
746 static int gas_query_set_sa(struct gas_query *gas,
747 struct gas_query_pending *query)
749 struct wpa_supplicant *wpa_s = gas->wpa_s;
750 struct os_reltime now;
752 if (!wpa_s->conf->gas_rand_mac_addr ||
753 !(wpa_s->current_bss ?
755 WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA_CONNECTED) :
756 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_MGMT_TX_RANDOM_TA))) {
757 /* Use own MAC address as the transmitter address */
758 os_memcpy(query->sa, wpa_s->own_addr, ETH_ALEN);
762 os_get_reltime(&now);
764 if (wpa_s->conf->gas_rand_mac_addr == gas->last_rand_sa_type &&
765 gas->last_mac_addr_rand.sec != 0 &&
766 !os_reltime_expired(&now, &gas->last_mac_addr_rand,
767 wpa_s->conf->gas_rand_addr_lifetime)) {
768 wpa_printf(MSG_DEBUG,
769 "GAS: Use the previously selected random transmitter address "
770 MACSTR, MAC2STR(gas->rand_addr));
771 os_memcpy(query->sa, gas->rand_addr, ETH_ALEN);
775 if (wpa_s->conf->gas_rand_mac_addr == 1 &&
776 random_mac_addr(gas->rand_addr) < 0) {
777 wpa_printf(MSG_ERROR, "GAS: Failed to get random address");
781 if (wpa_s->conf->gas_rand_mac_addr == 2 &&
782 random_mac_addr_keep_oui(gas->rand_addr) < 0) {
783 wpa_printf(MSG_ERROR,
784 "GAS: Failed to get random address with same OUI");
788 wpa_printf(MSG_DEBUG, "GAS: Use a new random transmitter address "
789 MACSTR, MAC2STR(gas->rand_addr));
790 os_memcpy(query->sa, gas->rand_addr, ETH_ALEN);
791 os_get_reltime(&gas->last_mac_addr_rand);
792 gas->last_rand_sa_type = wpa_s->conf->gas_rand_mac_addr;
799 * gas_query_req - Request a GAS query
800 * @gas: GAS query data from gas_query_init()
801 * @dst: Destination MAC address for the query
802 * @freq: Frequency (in MHz) for the channel on which to send the query
803 * @req: GAS query payload (to be freed by gas_query module in case of success
805 * @cb: Callback function for reporting GAS query result and response
806 * @ctx: Context pointer to use with the @cb call
807 * Returns: dialog token (>= 0) on success or -1 on failure
809 int gas_query_req(struct gas_query *gas, const u8 *dst, int freq,
810 int wildcard_bssid, struct wpabuf *req,
811 void (*cb)(void *ctx, const u8 *dst, u8 dialog_token,
812 enum gas_query_result result,
813 const struct wpabuf *adv_proto,
814 const struct wpabuf *resp, u16 status_code),
817 struct gas_query_pending *query;
820 if (wpabuf_len(req) < 3)
823 dialog_token = gas_query_new_dialog_token(gas, dst);
824 if (dialog_token < 0)
827 query = os_zalloc(sizeof(*query));
832 if (gas_query_set_sa(gas, query)) {
836 os_memcpy(query->addr, dst, ETH_ALEN);
837 query->dialog_token = dialog_token;
838 query->wildcard_bssid = !!wildcard_bssid;
843 dl_list_add(&gas->pending, &query->list);
845 *(wpabuf_mhead_u8(req) + 2) = dialog_token;
847 wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_START "addr=" MACSTR
848 " dialog_token=%u freq=%d",
849 MAC2STR(query->addr), query->dialog_token, query->freq);
851 if (radio_add_work(gas->wpa_s, freq, "gas-query", 0, gas_query_start_cb,
853 query->req = NULL; /* caller will free this in error case */
854 gas_query_free(query, 1);
862 int gas_query_stop(struct gas_query *gas, u8 dialog_token)
864 struct gas_query_pending *query;
866 dl_list_for_each(query, &gas->pending, struct gas_query_pending, list) {
867 if (query->dialog_token == dialog_token) {
869 /* The pending radio work has not yet been
870 * started, but the pending entry has a
871 * reference to the soon to be freed query.
872 * Need to remove that radio work now to avoid
873 * leaving behind a reference to freed memory.
875 radio_remove_pending_work(gas->wpa_s, query);
877 gas_query_done(gas, query, GAS_QUERY_STOPPED);