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;
48 struct wpabuf
*adv_proto
;
50 struct os_reltime last_oper
;
51 void (*cb
)(void *ctx
, const u8
*dst
, u8 dialog_token
,
52 enum gas_query_result result
,
53 const struct wpabuf
*adv_proto
,
54 const struct wpabuf
*resp
, u16 status_code
);
59 * struct gas_query - Internal GAS query data
62 struct wpa_supplicant
*wpa_s
;
63 struct dl_list pending
; /* struct gas_query_pending */
64 struct gas_query_pending
*current
;
65 struct wpa_radio_work
*work
;
69 static void gas_query_tx_comeback_timeout(void *eloop_data
, void *user_ctx
);
70 static void gas_query_timeout(void *eloop_data
, void *user_ctx
);
71 static void gas_query_rx_comeback_timeout(void *eloop_data
, void *user_ctx
);
72 static void gas_query_tx_initial_req(struct gas_query
*gas
,
73 struct gas_query_pending
*query
);
74 static int gas_query_new_dialog_token(struct gas_query
*gas
, const u8
*dst
);
77 static int ms_from_time(struct os_reltime
*last
)
79 struct os_reltime now
, res
;
82 os_reltime_sub(&now
, last
, &res
);
83 return res
.sec
* 1000 + res
.usec
/ 1000;
88 * gas_query_init - Initialize GAS query component
89 * @wpa_s: Pointer to wpa_supplicant data
90 * Returns: Pointer to GAS query data or %NULL on failure
92 struct gas_query
* gas_query_init(struct wpa_supplicant
*wpa_s
)
94 struct gas_query
*gas
;
96 gas
= os_zalloc(sizeof(*gas
));
101 dl_list_init(&gas
->pending
);
107 static const char * gas_result_txt(enum gas_query_result result
)
110 case GAS_QUERY_SUCCESS
:
112 case GAS_QUERY_FAILURE
:
114 case GAS_QUERY_TIMEOUT
:
116 case GAS_QUERY_PEER_ERROR
:
118 case GAS_QUERY_INTERNAL_ERROR
:
119 return "INTERNAL_ERROR";
120 case GAS_QUERY_CANCELLED
:
122 case GAS_QUERY_DELETED_AT_DEINIT
:
123 return "DELETED_AT_DEINIT";
130 static void gas_query_free(struct gas_query_pending
*query
, int del_list
)
132 struct gas_query
*gas
= query
->gas
;
135 dl_list_del(&query
->list
);
137 if (gas
->work
&& gas
->work
->ctx
== query
) {
138 radio_work_done(gas
->work
);
142 wpabuf_free(query
->req
);
143 wpabuf_free(query
->adv_proto
);
144 wpabuf_free(query
->resp
);
149 static void gas_query_done(struct gas_query
*gas
,
150 struct gas_query_pending
*query
,
151 enum gas_query_result result
)
153 wpa_msg(gas
->wpa_s
, MSG_INFO
, GAS_QUERY_DONE
"addr=" MACSTR
154 " dialog_token=%u freq=%d status_code=%u result=%s",
155 MAC2STR(query
->addr
), query
->dialog_token
, query
->freq
,
156 query
->status_code
, gas_result_txt(result
));
157 if (gas
->current
== query
)
159 if (query
->offchannel_tx_started
)
160 offchannel_send_action_done(gas
->wpa_s
);
161 eloop_cancel_timeout(gas_query_tx_comeback_timeout
, gas
, query
);
162 eloop_cancel_timeout(gas_query_timeout
, gas
, query
);
163 eloop_cancel_timeout(gas_query_rx_comeback_timeout
, gas
, query
);
164 dl_list_del(&query
->list
);
165 query
->cb(query
->ctx
, query
->addr
, query
->dialog_token
, result
,
166 query
->adv_proto
, query
->resp
, query
->status_code
);
167 gas_query_free(query
, 0);
172 * gas_query_deinit - Deinitialize GAS query component
173 * @gas: GAS query data from gas_query_init()
175 void gas_query_deinit(struct gas_query
*gas
)
177 struct gas_query_pending
*query
, *next
;
182 dl_list_for_each_safe(query
, next
, &gas
->pending
,
183 struct gas_query_pending
, list
)
184 gas_query_done(gas
, query
, GAS_QUERY_DELETED_AT_DEINIT
);
190 static struct gas_query_pending
*
191 gas_query_get_pending(struct gas_query
*gas
, const u8
*addr
, u8 dialog_token
)
193 struct gas_query_pending
*q
;
194 dl_list_for_each(q
, &gas
->pending
, struct gas_query_pending
, list
) {
195 if (os_memcmp(q
->addr
, addr
, ETH_ALEN
) == 0 &&
196 q
->dialog_token
== dialog_token
)
203 static int gas_query_append(struct gas_query_pending
*query
, const u8
*data
,
206 if (wpabuf_resize(&query
->resp
, len
) < 0) {
207 wpa_printf(MSG_DEBUG
, "GAS: No memory to store the response");
210 wpabuf_put_data(query
->resp
, data
, len
);
215 static void gas_query_tx_status(struct wpa_supplicant
*wpa_s
,
216 unsigned int freq
, const u8
*dst
,
217 const u8
*src
, const u8
*bssid
,
218 const u8
*data
, size_t data_len
,
219 enum offchannel_send_action_result result
)
221 struct gas_query_pending
*query
;
222 struct gas_query
*gas
= wpa_s
->gas
;
225 if (gas
->current
== NULL
) {
226 wpa_printf(MSG_DEBUG
, "GAS: Unexpected TX status: freq=%u dst="
227 MACSTR
" result=%d - no query in progress",
228 freq
, MAC2STR(dst
), result
);
232 query
= gas
->current
;
234 dur
= ms_from_time(&query
->last_oper
);
235 wpa_printf(MSG_DEBUG
, "GAS: TX status: freq=%u dst=" MACSTR
236 " result=%d query=%p dialog_token=%u dur=%d ms",
237 freq
, MAC2STR(dst
), result
, query
, query
->dialog_token
, dur
);
238 if (os_memcmp(dst
, query
->addr
, ETH_ALEN
) != 0) {
239 wpa_printf(MSG_DEBUG
, "GAS: TX status for unexpected destination");
242 os_get_reltime(&query
->last_oper
);
244 if (result
== OFFCHANNEL_SEND_ACTION_SUCCESS
) {
245 eloop_cancel_timeout(gas_query_timeout
, gas
, query
);
246 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD
, 0,
247 gas_query_timeout
, gas
, query
);
248 if (query
->wait_comeback
&& !query
->retry
) {
249 eloop_cancel_timeout(gas_query_rx_comeback_timeout
,
251 eloop_register_timeout(
252 0, (GAS_QUERY_WAIT_TIME_COMEBACK
+ 10) * 1000,
253 gas_query_rx_comeback_timeout
, gas
, query
);
256 if (result
== OFFCHANNEL_SEND_ACTION_FAILED
) {
257 eloop_cancel_timeout(gas_query_timeout
, gas
, query
);
258 eloop_register_timeout(0, 0, gas_query_timeout
, gas
, query
);
263 static int pmf_in_use(struct wpa_supplicant
*wpa_s
, const u8
*addr
)
265 if (wpa_s
->current_ssid
== NULL
||
266 wpa_s
->wpa_state
< WPA_4WAY_HANDSHAKE
||
267 os_memcmp(addr
, wpa_s
->bssid
, ETH_ALEN
) != 0)
269 return wpa_sm_pmf_enabled(wpa_s
->wpa
);
273 static int gas_query_tx(struct gas_query
*gas
, struct gas_query_pending
*query
,
274 struct wpabuf
*req
, unsigned int wait_time
)
276 int res
, prot
= pmf_in_use(gas
->wpa_s
, query
->addr
);
278 const u8 wildcard_bssid
[ETH_ALEN
] = {
279 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
282 wpa_printf(MSG_DEBUG
, "GAS: Send action frame to " MACSTR
" len=%u "
283 "freq=%d prot=%d", MAC2STR(query
->addr
),
284 (unsigned int) wpabuf_len(req
), query
->freq
, prot
);
286 u8
*categ
= wpabuf_mhead_u8(req
);
287 *categ
= WLAN_ACTION_PROTECTED_DUAL
;
289 os_get_reltime(&query
->last_oper
);
290 if (gas
->wpa_s
->max_remain_on_chan
&&
291 wait_time
> gas
->wpa_s
->max_remain_on_chan
)
292 wait_time
= gas
->wpa_s
->max_remain_on_chan
;
293 if (!gas
->wpa_s
->conf
->gas_address3
||
294 (gas
->wpa_s
->current_ssid
&&
295 gas
->wpa_s
->wpa_state
>= WPA_ASSOCIATED
&&
296 os_memcmp(query
->addr
, gas
->wpa_s
->bssid
, ETH_ALEN
) == 0))
299 bssid
= wildcard_bssid
;
300 res
= offchannel_send_action(gas
->wpa_s
, query
->freq
, query
->addr
,
301 gas
->wpa_s
->own_addr
, bssid
,
302 wpabuf_head(req
), wpabuf_len(req
),
303 wait_time
, gas_query_tx_status
, 0);
305 query
->offchannel_tx_started
= 1;
310 static void gas_query_tx_comeback_req(struct gas_query
*gas
,
311 struct gas_query_pending
*query
)
314 unsigned int wait_time
;
316 req
= gas_build_comeback_req(query
->dialog_token
);
318 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
322 wait_time
= (query
->retry
|| !query
->offchannel_tx_started
) ?
323 GAS_QUERY_WAIT_TIME_INITIAL
: GAS_QUERY_WAIT_TIME_COMEBACK
;
325 if (gas_query_tx(gas
, query
, req
, wait_time
) < 0) {
326 wpa_printf(MSG_DEBUG
, "GAS: Failed to send Action frame to "
327 MACSTR
, MAC2STR(query
->addr
));
328 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
335 static void gas_query_rx_comeback_timeout(void *eloop_data
, void *user_ctx
)
337 struct gas_query
*gas
= eloop_data
;
338 struct gas_query_pending
*query
= user_ctx
;
341 wpa_printf(MSG_DEBUG
,
342 "GAS: No response to comeback request received (retry=%u)",
344 if (gas
->current
!= query
|| query
->retry
)
346 dialog_token
= gas_query_new_dialog_token(gas
, query
->addr
);
347 if (dialog_token
< 0)
349 wpa_printf(MSG_DEBUG
,
350 "GAS: Retry GAS query due to comeback response timeout");
352 query
->dialog_token
= dialog_token
;
353 *(wpabuf_mhead_u8(query
->req
) + 2) = dialog_token
;
354 query
->wait_comeback
= 0;
355 query
->next_frag_id
= 0;
356 wpabuf_free(query
->adv_proto
);
357 query
->adv_proto
= NULL
;
358 eloop_cancel_timeout(gas_query_tx_comeback_timeout
, gas
, query
);
359 eloop_cancel_timeout(gas_query_timeout
, gas
, query
);
360 gas_query_tx_initial_req(gas
, query
);
364 static void gas_query_tx_comeback_timeout(void *eloop_data
, void *user_ctx
)
366 struct gas_query
*gas
= eloop_data
;
367 struct gas_query_pending
*query
= user_ctx
;
369 wpa_printf(MSG_DEBUG
, "GAS: Comeback timeout for request to " MACSTR
,
370 MAC2STR(query
->addr
));
371 gas_query_tx_comeback_req(gas
, query
);
375 static void gas_query_tx_comeback_req_delay(struct gas_query
*gas
,
376 struct gas_query_pending
*query
,
379 unsigned int secs
, usecs
;
381 if (comeback_delay
> 1 && query
->offchannel_tx_started
) {
382 offchannel_send_action_done(gas
->wpa_s
);
383 query
->offchannel_tx_started
= 0;
386 secs
= (comeback_delay
* 1024) / 1000000;
387 usecs
= comeback_delay
* 1024 - secs
* 1000000;
388 wpa_printf(MSG_DEBUG
, "GAS: Send comeback request to " MACSTR
389 " in %u secs %u usecs", MAC2STR(query
->addr
), secs
, usecs
);
390 eloop_cancel_timeout(gas_query_tx_comeback_timeout
, gas
, query
);
391 eloop_register_timeout(secs
, usecs
, gas_query_tx_comeback_timeout
,
396 static void gas_query_rx_initial(struct gas_query
*gas
,
397 struct gas_query_pending
*query
,
398 const u8
*adv_proto
, const u8
*resp
,
399 size_t len
, u16 comeback_delay
)
401 wpa_printf(MSG_DEBUG
, "GAS: Received initial response from "
402 MACSTR
" (dialog_token=%u comeback_delay=%u)",
403 MAC2STR(query
->addr
), query
->dialog_token
, comeback_delay
);
405 query
->adv_proto
= wpabuf_alloc_copy(adv_proto
, 2 + adv_proto
[1]);
406 if (query
->adv_proto
== NULL
) {
407 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
411 if (comeback_delay
) {
412 query
->wait_comeback
= 1;
413 gas_query_tx_comeback_req_delay(gas
, query
, comeback_delay
);
417 /* Query was completed without comeback mechanism */
418 if (gas_query_append(query
, resp
, len
) < 0) {
419 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
423 gas_query_done(gas
, query
, GAS_QUERY_SUCCESS
);
427 static void gas_query_rx_comeback(struct gas_query
*gas
,
428 struct gas_query_pending
*query
,
429 const u8
*adv_proto
, const u8
*resp
,
430 size_t len
, u8 frag_id
, u8 more_frags
,
433 wpa_printf(MSG_DEBUG
, "GAS: Received comeback response from "
434 MACSTR
" (dialog_token=%u frag_id=%u more_frags=%u "
435 "comeback_delay=%u)",
436 MAC2STR(query
->addr
), query
->dialog_token
, frag_id
,
437 more_frags
, comeback_delay
);
438 eloop_cancel_timeout(gas_query_rx_comeback_timeout
, gas
, query
);
440 if ((size_t) 2 + adv_proto
[1] != wpabuf_len(query
->adv_proto
) ||
441 os_memcmp(adv_proto
, wpabuf_head(query
->adv_proto
),
442 wpabuf_len(query
->adv_proto
)) != 0) {
443 wpa_printf(MSG_DEBUG
, "GAS: Advertisement Protocol changed "
444 "between initial and comeback response from "
445 MACSTR
, MAC2STR(query
->addr
));
446 gas_query_done(gas
, query
, GAS_QUERY_PEER_ERROR
);
450 if (comeback_delay
) {
452 wpa_printf(MSG_DEBUG
, "GAS: Invalid comeback response "
453 "with non-zero frag_id and comeback_delay "
454 "from " MACSTR
, MAC2STR(query
->addr
));
455 gas_query_done(gas
, query
, GAS_QUERY_PEER_ERROR
);
458 gas_query_tx_comeback_req_delay(gas
, query
, comeback_delay
);
462 if (frag_id
!= query
->next_frag_id
) {
463 wpa_printf(MSG_DEBUG
, "GAS: Unexpected frag_id in response "
464 "from " MACSTR
, MAC2STR(query
->addr
));
465 if (frag_id
+ 1 == query
->next_frag_id
) {
466 wpa_printf(MSG_DEBUG
, "GAS: Drop frame as possible "
467 "retry of previous fragment");
470 gas_query_done(gas
, query
, GAS_QUERY_PEER_ERROR
);
473 query
->next_frag_id
++;
475 if (gas_query_append(query
, resp
, len
) < 0) {
476 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
481 gas_query_tx_comeback_req(gas
, query
);
485 gas_query_done(gas
, query
, GAS_QUERY_SUCCESS
);
490 * gas_query_rx - Indicate reception of a Public Action or Protected Dual frame
491 * @gas: GAS query data from gas_query_init()
492 * @da: Destination MAC address of the Action frame
493 * @sa: Source MAC address of the Action frame
494 * @bssid: BSSID of the Action frame
495 * @categ: Category of the Action frame
496 * @data: Payload of the Action frame
497 * @len: Length of @data
498 * @freq: Frequency (in MHz) on which the frame was received
499 * Returns: 0 if the Public Action frame was a GAS frame or -1 if not
501 int gas_query_rx(struct gas_query
*gas
, const u8
*da
, const u8
*sa
,
502 const u8
*bssid
, u8 categ
, const u8
*data
, size_t len
,
505 struct gas_query_pending
*query
;
506 u8 action
, dialog_token
, frag_id
= 0, more_frags
= 0;
507 u16 comeback_delay
, resp_len
;
508 const u8
*pos
, *adv_proto
;
512 if (gas
== NULL
|| len
< 4)
517 dialog_token
= *pos
++;
519 if (action
!= WLAN_PA_GAS_INITIAL_RESP
&&
520 action
!= WLAN_PA_GAS_COMEBACK_RESP
)
521 return -1; /* Not a GAS response */
523 prot
= categ
== WLAN_ACTION_PROTECTED_DUAL
;
524 pmf
= pmf_in_use(gas
->wpa_s
, sa
);
526 wpa_printf(MSG_DEBUG
, "GAS: Drop unexpected protected GAS frame when PMF is disabled");
530 wpa_printf(MSG_DEBUG
, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled");
534 query
= gas_query_get_pending(gas
, sa
, dialog_token
);
536 wpa_printf(MSG_DEBUG
, "GAS: No pending query found for " MACSTR
537 " dialog token %u", MAC2STR(sa
), dialog_token
);
541 wpa_printf(MSG_DEBUG
, "GAS: Response in %d ms from " MACSTR
,
542 ms_from_time(&query
->last_oper
), MAC2STR(sa
));
544 if (query
->wait_comeback
&& action
== WLAN_PA_GAS_INITIAL_RESP
) {
545 wpa_printf(MSG_DEBUG
, "GAS: Unexpected initial response from "
546 MACSTR
" dialog token %u when waiting for comeback "
547 "response", MAC2STR(sa
), dialog_token
);
551 if (!query
->wait_comeback
&& action
== WLAN_PA_GAS_COMEBACK_RESP
) {
552 wpa_printf(MSG_DEBUG
, "GAS: Unexpected comeback response from "
553 MACSTR
" dialog token %u when waiting for initial "
554 "response", MAC2STR(sa
), dialog_token
);
558 query
->status_code
= WPA_GET_LE16(pos
);
561 if (query
->status_code
== WLAN_STATUS_QUERY_RESP_OUTSTANDING
&&
562 action
== WLAN_PA_GAS_COMEBACK_RESP
) {
563 wpa_printf(MSG_DEBUG
, "GAS: Allow non-zero status for outstanding comeback response");
564 } else if (query
->status_code
!= WLAN_STATUS_SUCCESS
) {
565 wpa_printf(MSG_DEBUG
, "GAS: Query to " MACSTR
" dialog token "
566 "%u failed - status code %u",
567 MAC2STR(sa
), dialog_token
, query
->status_code
);
568 gas_query_done(gas
, query
, GAS_QUERY_FAILURE
);
572 if (action
== WLAN_PA_GAS_COMEBACK_RESP
) {
573 if (pos
+ 1 > data
+ len
)
575 frag_id
= *pos
& 0x7f;
576 more_frags
= (*pos
& 0x80) >> 7;
581 if (pos
+ 2 > data
+ len
)
583 comeback_delay
= WPA_GET_LE16(pos
);
586 /* Advertisement Protocol element */
587 if (pos
+ 2 > data
+ len
|| pos
+ 2 + pos
[1] > data
+ len
) {
588 wpa_printf(MSG_DEBUG
, "GAS: No room for Advertisement "
589 "Protocol element in the response from " MACSTR
,
594 if (*pos
!= WLAN_EID_ADV_PROTO
) {
595 wpa_printf(MSG_DEBUG
, "GAS: Unexpected Advertisement "
596 "Protocol element ID %u in response from " MACSTR
,
604 /* Query Response Length */
605 if (pos
+ 2 > data
+ len
) {
606 wpa_printf(MSG_DEBUG
, "GAS: No room for GAS Response Length");
609 resp_len
= WPA_GET_LE16(pos
);
612 left
= data
+ len
- pos
;
613 if (resp_len
> left
) {
614 wpa_printf(MSG_DEBUG
, "GAS: Truncated Query Response in "
615 "response from " MACSTR
, MAC2STR(sa
));
619 if (resp_len
< left
) {
620 wpa_printf(MSG_DEBUG
, "GAS: Ignore %u octets of extra data "
621 "after Query Response from " MACSTR
,
622 left
- resp_len
, MAC2STR(sa
));
625 if (action
== WLAN_PA_GAS_COMEBACK_RESP
)
626 gas_query_rx_comeback(gas
, query
, adv_proto
, pos
, resp_len
,
627 frag_id
, more_frags
, comeback_delay
);
629 gas_query_rx_initial(gas
, query
, adv_proto
, pos
, resp_len
,
636 static void gas_query_timeout(void *eloop_data
, void *user_ctx
)
638 struct gas_query
*gas
= eloop_data
;
639 struct gas_query_pending
*query
= user_ctx
;
641 wpa_printf(MSG_DEBUG
, "GAS: No response received for query to " MACSTR
643 MAC2STR(query
->addr
), query
->dialog_token
);
644 gas_query_done(gas
, query
, GAS_QUERY_TIMEOUT
);
648 static int gas_query_dialog_token_available(struct gas_query
*gas
,
649 const u8
*dst
, u8 dialog_token
)
651 struct gas_query_pending
*q
;
652 dl_list_for_each(q
, &gas
->pending
, struct gas_query_pending
, list
) {
653 if (os_memcmp(dst
, q
->addr
, ETH_ALEN
) == 0 &&
654 dialog_token
== q
->dialog_token
)
662 static void gas_query_start_cb(struct wpa_radio_work
*work
, int deinit
)
664 struct gas_query_pending
*query
= work
->ctx
;
665 struct gas_query
*gas
= query
->gas
;
666 struct wpa_supplicant
*wpa_s
= gas
->wpa_s
;
671 gas_query_done(gas
, query
, GAS_QUERY_DELETED_AT_DEINIT
);
675 gas_query_free(query
, 1);
679 if (wpas_update_random_addr_disassoc(wpa_s
) < 0) {
680 wpa_msg(wpa_s
, MSG_INFO
,
681 "Failed to assign random MAC address for GAS");
682 gas_query_free(query
, 1);
683 radio_work_done(work
);
688 gas_query_tx_initial_req(gas
, query
);
692 static void gas_query_tx_initial_req(struct gas_query
*gas
,
693 struct gas_query_pending
*query
)
695 if (gas_query_tx(gas
, query
, query
->req
,
696 GAS_QUERY_WAIT_TIME_INITIAL
) < 0) {
697 wpa_printf(MSG_DEBUG
, "GAS: Failed to send Action frame to "
698 MACSTR
, MAC2STR(query
->addr
));
699 gas_query_done(gas
, query
, GAS_QUERY_INTERNAL_ERROR
);
702 gas
->current
= query
;
704 wpa_printf(MSG_DEBUG
, "GAS: Starting query timeout for dialog token %u",
705 query
->dialog_token
);
706 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD
, 0,
707 gas_query_timeout
, gas
, query
);
711 static int gas_query_new_dialog_token(struct gas_query
*gas
, const u8
*dst
)
713 static int next_start
= 0;
716 for (dialog_token
= 0; dialog_token
< 256; dialog_token
++) {
717 if (gas_query_dialog_token_available(
718 gas
, dst
, (next_start
+ dialog_token
) % 256))
721 if (dialog_token
== 256)
722 return -1; /* Too many pending queries */
723 dialog_token
= (next_start
+ dialog_token
) % 256;
724 next_start
= (dialog_token
+ 1) % 256;
730 * gas_query_req - Request a GAS query
731 * @gas: GAS query data from gas_query_init()
732 * @dst: Destination MAC address for the query
733 * @freq: Frequency (in MHz) for the channel on which to send the query
734 * @req: GAS query payload (to be freed by gas_query module in case of success
736 * @cb: Callback function for reporting GAS query result and response
737 * @ctx: Context pointer to use with the @cb call
738 * Returns: dialog token (>= 0) on success or -1 on failure
740 int gas_query_req(struct gas_query
*gas
, const u8
*dst
, int freq
,
742 void (*cb
)(void *ctx
, const u8
*dst
, u8 dialog_token
,
743 enum gas_query_result result
,
744 const struct wpabuf
*adv_proto
,
745 const struct wpabuf
*resp
, u16 status_code
),
748 struct gas_query_pending
*query
;
751 if (wpabuf_len(req
) < 3)
754 dialog_token
= gas_query_new_dialog_token(gas
, dst
);
755 if (dialog_token
< 0)
758 query
= os_zalloc(sizeof(*query
));
763 os_memcpy(query
->addr
, dst
, ETH_ALEN
);
764 query
->dialog_token
= dialog_token
;
769 dl_list_add(&gas
->pending
, &query
->list
);
771 *(wpabuf_mhead_u8(req
) + 2) = dialog_token
;
773 wpa_msg(gas
->wpa_s
, MSG_INFO
, GAS_QUERY_START
"addr=" MACSTR
774 " dialog_token=%u freq=%d",
775 MAC2STR(query
->addr
), query
->dialog_token
, query
->freq
);
777 if (radio_add_work(gas
->wpa_s
, freq
, "gas-query", 0, gas_query_start_cb
,
779 gas_query_free(query
, 1);
788 * gas_query_cancel - Cancel a pending GAS query
789 * @gas: GAS query data from gas_query_init()
790 * @dst: Destination MAC address for the query
791 * @dialog_token: Dialog token from gas_query_req()
793 void gas_query_cancel(struct gas_query
*gas
, const u8
*dst
, u8 dialog_token
)
795 struct gas_query_pending
*query
;
797 query
= gas_query_get_pending(gas
, dst
, dialog_token
);
799 gas_query_done(gas
, query
, GAS_QUERY_CANCELLED
);