2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
16 #include "wpa_supplicant_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
21 #include "hs20_supplicant.h"
28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant
*wpa_s
)
30 struct wpa_ssid
*ssid
;
31 union wpa_event_data data
;
33 ssid
= wpa_supplicant_get_ssid(wpa_s
);
37 if (wpa_s
->current_ssid
== NULL
) {
38 wpa_s
->current_ssid
= ssid
;
39 if (wpa_s
->current_ssid
!= NULL
)
40 wpas_notify_network_changed(wpa_s
);
42 wpa_supplicant_initiate_eapol(wpa_s
);
43 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already associated with a configured "
44 "network - generating associated event");
45 os_memset(&data
, 0, sizeof(data
));
46 wpa_supplicant_event(wpa_s
, EVENT_ASSOC
, &data
);
51 static int wpas_wps_in_use(struct wpa_supplicant
*wpa_s
,
52 enum wps_request_type
*req_type
)
54 struct wpa_ssid
*ssid
;
57 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
58 if (!(ssid
->key_mgmt
& WPA_KEY_MGMT_WPS
))
62 *req_type
= wpas_wps_get_req_type(ssid
);
63 if (!ssid
->eap
.phase1
)
66 if (os_strstr(ssid
->eap
.phase1
, "pbc=1"))
71 if (!wpa_s
->global
->p2p_disabled
&& wpa_s
->global
->p2p
&&
72 !wpa_s
->conf
->p2p_disabled
) {
73 wpa_s
->wps
->dev
.p2p
= 1;
76 *req_type
= WPS_REQ_ENROLLEE_INFO
;
79 #endif /* CONFIG_P2P */
83 #endif /* CONFIG_WPS */
87 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
88 * @wpa_s: Pointer to wpa_supplicant data
89 * Returns: 0 if no networks are enabled, >0 if networks are enabled
91 * This function is used to figure out whether any networks (or Interworking
92 * with enabled credentials and auto_interworking) are present in the current
95 int wpa_supplicant_enabled_networks(struct wpa_supplicant
*wpa_s
)
97 struct wpa_ssid
*ssid
= wpa_s
->conf
->ssid
;
98 int count
= 0, disabled
= 0;
100 if (!wpas_network_disabled(wpa_s
, ssid
))
106 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
107 wpa_s
->conf
->auto_interworking
)
109 if (count
== 0 && disabled
> 0) {
110 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks (%d disabled "
111 "networks)", disabled
);
117 static void wpa_supplicant_assoc_try(struct wpa_supplicant
*wpa_s
,
118 struct wpa_ssid
*ssid
)
121 if (!wpas_network_disabled(wpa_s
, ssid
))
126 /* ap_scan=2 mode - try to associate with each SSID. */
128 wpa_dbg(wpa_s
, MSG_DEBUG
, "wpa_supplicant_assoc_try: Reached "
129 "end of scan list - go back to beginning");
130 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
131 wpa_supplicant_req_scan(wpa_s
, 0, 0);
135 /* Continue from the next SSID on the next attempt. */
136 wpa_s
->prev_scan_ssid
= ssid
;
138 /* Start from the beginning of the SSID list. */
139 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
141 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
145 static void wpas_trigger_scan_cb(struct wpa_radio_work
*work
, int deinit
)
147 struct wpa_supplicant
*wpa_s
= work
->wpa_s
;
148 struct wpa_driver_scan_params
*params
= work
->ctx
;
152 if (!work
->started
) {
153 wpa_scan_free_params(params
);
156 wpa_supplicant_notify_scanning(wpa_s
, 0);
157 wpas_notify_scan_done(wpa_s
, 0);
158 wpa_s
->scan_work
= NULL
;
162 if (wpas_update_random_addr_disassoc(wpa_s
) < 0) {
163 wpa_msg(wpa_s
, MSG_INFO
,
164 "Failed to assign random MAC address for a scan");
165 radio_work_done(work
);
169 wpa_supplicant_notify_scanning(wpa_s
, 1);
171 if (wpa_s
->clear_driver_scan_cache
)
172 params
->only_new_results
= 1;
173 ret
= wpa_drv_scan(wpa_s
, params
);
174 wpa_scan_free_params(params
);
177 wpa_supplicant_notify_scanning(wpa_s
, 0);
178 wpas_notify_scan_done(wpa_s
, 0);
179 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_FAILED
"ret=%d",
181 radio_work_done(work
);
185 os_get_reltime(&wpa_s
->scan_trigger_time
);
187 wpa_s
->normal_scans
++;
188 wpa_s
->own_scan_requested
= 1;
189 wpa_s
->clear_driver_scan_cache
= 0;
190 wpa_s
->scan_work
= work
;
195 * wpa_supplicant_trigger_scan - Request driver to start a scan
196 * @wpa_s: Pointer to wpa_supplicant data
197 * @params: Scan parameters
198 * Returns: 0 on success, -1 on failure
200 int wpa_supplicant_trigger_scan(struct wpa_supplicant
*wpa_s
,
201 struct wpa_driver_scan_params
*params
)
203 struct wpa_driver_scan_params
*ctx
;
205 if (wpa_s
->scan_work
) {
206 wpa_dbg(wpa_s
, MSG_INFO
, "Reject scan trigger since one is already pending");
210 ctx
= wpa_scan_clone_params(params
);
214 if (radio_add_work(wpa_s
, 0, "scan", 0, wpas_trigger_scan_cb
, ctx
) < 0)
216 wpa_scan_free_params(ctx
);
225 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
227 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
229 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting delayed sched scan");
231 if (wpa_supplicant_req_sched_scan(wpa_s
))
232 wpa_supplicant_req_scan(wpa_s
, 0, 0);
237 wpa_supplicant_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
239 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
241 wpa_dbg(wpa_s
, MSG_DEBUG
, "Sched scan timeout - stopping it");
243 wpa_s
->sched_scan_timed_out
= 1;
244 wpa_supplicant_cancel_sched_scan(wpa_s
);
248 int wpa_supplicant_start_sched_scan(struct wpa_supplicant
*wpa_s
,
249 struct wpa_driver_scan_params
*params
,
254 wpa_supplicant_notify_scanning(wpa_s
, 1);
255 ret
= wpa_drv_sched_scan(wpa_s
, params
, interval
* 1000);
257 wpa_supplicant_notify_scanning(wpa_s
, 0);
259 wpa_s
->sched_scanning
= 1;
265 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant
*wpa_s
)
269 ret
= wpa_drv_stop_sched_scan(wpa_s
);
271 wpa_dbg(wpa_s
, MSG_DEBUG
, "stopping sched_scan failed!");
272 /* TODO: what to do if stopping fails? */
280 static struct wpa_driver_scan_filter
*
281 wpa_supplicant_build_filter_ssids(struct wpa_config
*conf
, size_t *num_ssids
)
283 struct wpa_driver_scan_filter
*ssids
;
284 struct wpa_ssid
*ssid
;
288 if (!conf
->filter_ssids
)
291 for (count
= 0, ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
292 if (ssid
->ssid
&& ssid
->ssid_len
)
297 ssids
= os_calloc(count
, sizeof(struct wpa_driver_scan_filter
));
301 for (ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
302 if (!ssid
->ssid
|| !ssid
->ssid_len
)
304 os_memcpy(ssids
[*num_ssids
].ssid
, ssid
->ssid
, ssid
->ssid_len
);
305 ssids
[*num_ssids
].ssid_len
= ssid
->ssid_len
;
313 static void wpa_supplicant_optimize_freqs(
314 struct wpa_supplicant
*wpa_s
, struct wpa_driver_scan_params
*params
)
317 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_provisioning
&&
319 /* Optimize provisioning state scan based on GO information */
320 if (wpa_s
->p2p_in_provisioning
< 5 &&
321 wpa_s
->go_params
->freq
> 0) {
322 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO "
323 "preferred frequency %d MHz",
324 wpa_s
->go_params
->freq
);
325 params
->freqs
= os_calloc(2, sizeof(int));
327 params
->freqs
[0] = wpa_s
->go_params
->freq
;
328 } else if (wpa_s
->p2p_in_provisioning
< 8 &&
329 wpa_s
->go_params
->freq_list
[0]) {
330 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only common "
332 int_array_concat(¶ms
->freqs
,
333 wpa_s
->go_params
->freq_list
);
335 int_array_sort_unique(params
->freqs
);
337 wpa_s
->p2p_in_provisioning
++;
340 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_invitation
) {
342 * Optimize scan based on GO information during persistent
345 if (wpa_s
->p2p_in_invitation
< 5 &&
346 wpa_s
->p2p_invite_go_freq
> 0) {
347 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO preferred frequency %d MHz during invitation",
348 wpa_s
->p2p_invite_go_freq
);
349 params
->freqs
= os_calloc(2, sizeof(int));
351 params
->freqs
[0] = wpa_s
->p2p_invite_go_freq
;
353 wpa_s
->p2p_in_invitation
++;
354 if (wpa_s
->p2p_in_invitation
> 20) {
356 * This should not really happen since the variable is
357 * cleared on group removal, but if it does happen, make
358 * sure we do not get stuck in special invitation scan
361 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Clear p2p_in_invitation");
362 wpa_s
->p2p_in_invitation
= 0;
365 #endif /* CONFIG_P2P */
368 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
370 * Optimize post-provisioning scan based on channel used
371 * during provisioning.
373 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
374 "that was used during provisioning", wpa_s
->wps_freq
);
375 params
->freqs
= os_calloc(2, sizeof(int));
377 params
->freqs
[0] = wpa_s
->wps_freq
;
379 } else if (wpa_s
->after_wps
)
382 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
384 /* Optimize provisioning scan based on already known channel */
385 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
387 params
->freqs
= os_calloc(2, sizeof(int));
389 params
->freqs
[0] = wpa_s
->wps_freq
;
390 wpa_s
->known_wps_freq
= 0; /* only do this once */
392 #endif /* CONFIG_WPS */
396 #ifdef CONFIG_INTERWORKING
397 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
400 if (wpa_s
->conf
->interworking
== 0)
403 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
404 wpabuf_put_u8(buf
, 6);
405 wpabuf_put_u8(buf
, 0x00);
406 wpabuf_put_u8(buf
, 0x00);
407 wpabuf_put_u8(buf
, 0x00);
408 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
409 wpabuf_put_u8(buf
, 0x00);
411 wpabuf_put_u8(buf
, 0x40); /* Bit 46 - WNM-Notification */
412 #else /* CONFIG_HS20 */
413 wpabuf_put_u8(buf
, 0x00);
414 #endif /* CONFIG_HS20 */
416 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
417 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
419 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
421 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
422 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
424 #endif /* CONFIG_INTERWORKING */
427 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
429 struct wpabuf
*extra_ie
= NULL
;
432 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
433 #endif /* CONFIG_WPS */
435 #ifdef CONFIG_INTERWORKING
436 if (wpa_s
->conf
->interworking
&&
437 wpabuf_resize(&extra_ie
, 100) == 0)
438 wpas_add_interworking_elements(wpa_s
, extra_ie
);
439 #endif /* CONFIG_INTERWORKING */
442 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
445 struct wpabuf
*wps_ie
;
446 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
449 wpa_s
->wps
->uuid
, req_type
,
452 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
453 wpabuf_put_buf(extra_ie
, wps_ie
);
460 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
461 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
462 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
464 #endif /* CONFIG_P2P */
466 wpa_supplicant_mesh_add_scan_ie(wpa_s
, &extra_ie
);
468 #endif /* CONFIG_WPS */
471 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
472 wpas_hs20_add_indication(extra_ie
, -1);
473 #endif /* CONFIG_HS20 */
482 * Check whether there are any enabled networks or credentials that could be
483 * used for a non-P2P connection.
485 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
487 struct wpa_ssid
*ssid
;
489 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
490 if (wpas_network_disabled(wpa_s
, ssid
))
492 if (!ssid
->p2p_group
)
496 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
497 wpa_s
->conf
->auto_interworking
)
503 #endif /* CONFIG_P2P */
506 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
508 enum hostapd_hw_mode mode
)
512 for (i
= 0; i
< num_modes
; i
++) {
513 if (modes
[i
].mode
== mode
)
521 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
522 enum hostapd_hw_mode band
,
523 struct wpa_driver_scan_params
*params
)
525 /* Include only supported channels for the specified band */
526 struct hostapd_hw_modes
*mode
;
529 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
531 /* No channels supported in this band - use empty list */
532 params
->freqs
= os_zalloc(sizeof(int));
536 params
->freqs
= os_calloc(mode
->num_channels
+ 1, sizeof(int));
537 if (params
->freqs
== NULL
)
539 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
540 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
542 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
547 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
548 struct wpa_driver_scan_params
*params
)
550 if (wpa_s
->hw
.modes
== NULL
)
551 return; /* unknown what channels the driver supports */
553 return; /* already using a limited channel set */
554 if (wpa_s
->setband
== WPA_SETBAND_5G
)
555 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
557 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
558 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
563 static void wpa_set_scan_ssids(struct wpa_supplicant
*wpa_s
,
564 struct wpa_driver_scan_params
*params
,
568 struct wpa_ssid
*ssid
;
570 for (i
= 0; i
< wpa_s
->scan_id_count
; i
++) {
573 ssid
= wpa_config_get_network(wpa_s
->conf
, wpa_s
->scan_id
[i
]);
574 if (!ssid
|| !ssid
->scan_ssid
)
577 for (j
= 0; j
< params
->num_ssids
; j
++) {
578 if (params
->ssids
[j
].ssid_len
== ssid
->ssid_len
&&
579 params
->ssids
[j
].ssid
&&
580 os_memcmp(params
->ssids
[j
].ssid
, ssid
->ssid
,
581 ssid
->ssid_len
) == 0)
584 if (j
< params
->num_ssids
)
585 continue; /* already in the list */
587 if (params
->num_ssids
+ 1 > max_ssids
) {
588 wpa_printf(MSG_DEBUG
,
589 "Over max scan SSIDs for manual request");
593 wpa_printf(MSG_DEBUG
, "Scan SSID (manual request): %s",
594 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
595 params
->ssids
[params
->num_ssids
].ssid
= ssid
->ssid
;
596 params
->ssids
[params
->num_ssids
].ssid_len
= ssid
->ssid_len
;
600 wpa_s
->scan_id_count
= 0;
604 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
606 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
607 struct wpa_ssid
*ssid
;
608 int ret
, p2p_in_progress
;
609 struct wpabuf
*extra_ie
= NULL
;
610 struct wpa_driver_scan_params params
;
611 struct wpa_driver_scan_params
*scan_params
;
613 enum wpa_states prev_state
;
615 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
) {
616 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - PNO is in progress");
620 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
621 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
625 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
626 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
627 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
631 if (wpa_s
->scanning
) {
633 * If we are already in scanning state, we shall reschedule the
634 * the incoming scan request.
636 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
637 wpa_supplicant_req_scan(wpa_s
, 1, 0);
641 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
642 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
643 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
644 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
648 if (wpa_s
->conf
->ap_scan
!= 0 &&
649 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
650 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
651 "overriding ap_scan configuration");
652 wpa_s
->conf
->ap_scan
= 0;
653 wpas_notify_ap_scan_changed(wpa_s
);
656 if (wpa_s
->conf
->ap_scan
== 0) {
657 wpa_supplicant_gen_assoc_event(wpa_s
);
661 p2p_in_progress
= wpas_p2p_in_progress(wpa_s
);
662 if (p2p_in_progress
&& p2p_in_progress
!= 2) {
663 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan while P2P operation is in progress");
664 wpa_supplicant_req_scan(wpa_s
, 5, 0);
668 if (wpa_s
->conf
->ap_scan
== 2)
671 max_ssids
= wpa_s
->max_scan_ssids
;
672 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
673 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
676 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
677 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
679 os_memset(¶ms
, 0, sizeof(params
));
681 prev_state
= wpa_s
->wpa_state
;
682 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
683 wpa_s
->wpa_state
== WPA_INACTIVE
)
684 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
687 * If autoscan has set its own scanning parameters
689 if (wpa_s
->autoscan_params
!= NULL
) {
690 scan_params
= wpa_s
->autoscan_params
;
694 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
695 wpa_s
->connect_without_scan
) {
696 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
697 if (ssid
== wpa_s
->connect_without_scan
)
700 wpa_s
->connect_without_scan
= NULL
;
702 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
703 "without scan step");
704 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
710 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
712 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
713 wpa_s
->p2p_in_provisioning
,
714 wpa_s
->show_group_started
);
715 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
716 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
717 params
.num_ssids
= 1;
721 if (wpa_s
->p2p_in_invitation
) {
722 if (wpa_s
->current_ssid
) {
723 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during invitation");
724 params
.ssids
[0].ssid
= wpa_s
->current_ssid
->ssid
;
725 params
.ssids
[0].ssid_len
=
726 wpa_s
->current_ssid
->ssid_len
;
727 params
.num_ssids
= 1;
729 wpa_printf(MSG_DEBUG
, "P2P: No specific SSID known for scan during invitation");
733 #endif /* CONFIG_P2P */
735 /* Find the starting point from which to continue scanning */
736 ssid
= wpa_s
->conf
->ssid
;
737 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
739 if (ssid
== wpa_s
->prev_scan_ssid
) {
747 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
748 wpa_s
->conf
->ap_scan
== 2) {
749 wpa_s
->connect_without_scan
= NULL
;
750 wpa_s
->prev_scan_wildcard
= 0;
751 wpa_supplicant_assoc_try(wpa_s
, ssid
);
753 } else if (wpa_s
->conf
->ap_scan
== 2) {
755 * User-initiated scan request in ap_scan == 2; scan with
759 } else if (wpa_s
->reattach
&& wpa_s
->current_ssid
!= NULL
) {
761 * Perform single-channel single-SSID scan for
762 * reassociate-to-same-BSS operation.
765 ssid
= wpa_s
->current_ssid
;
766 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
767 ssid
->ssid
, ssid
->ssid_len
);
768 params
.ssids
[0].ssid
= ssid
->ssid
;
769 params
.ssids
[0].ssid_len
= ssid
->ssid_len
;
770 params
.num_ssids
= 1;
773 * Allocate memory for frequency array, allocate one extra
774 * slot for the zero-terminator.
776 params
.freqs
= os_malloc(sizeof(int) * 2);
777 if (params
.freqs
== NULL
) {
778 wpa_dbg(wpa_s
, MSG_ERROR
, "Memory allocation failed");
781 params
.freqs
[0] = wpa_s
->assoc_freq
;
785 * Reset the reattach flag so that we fall back to full scan if
790 struct wpa_ssid
*start
= ssid
, *tssid
;
792 if (ssid
== NULL
&& max_ssids
> 1)
793 ssid
= wpa_s
->conf
->ssid
;
795 if (!wpas_network_disabled(wpa_s
, ssid
) &&
797 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
798 ssid
->ssid
, ssid
->ssid_len
);
799 params
.ssids
[params
.num_ssids
].ssid
=
801 params
.ssids
[params
.num_ssids
].ssid_len
=
804 if (params
.num_ssids
+ 1 >= max_ssids
)
810 if (ssid
== NULL
&& max_ssids
> 1 &&
811 start
!= wpa_s
->conf
->ssid
)
812 ssid
= wpa_s
->conf
->ssid
;
815 if (wpa_s
->scan_id_count
&&
816 wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
)
817 wpa_set_scan_ssids(wpa_s
, ¶ms
, max_ssids
);
819 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
820 if (wpas_network_disabled(wpa_s
, tssid
))
822 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
823 int_array_concat(¶ms
.freqs
,
826 os_free(params
.freqs
);
831 int_array_sort_unique(params
.freqs
);
834 if (ssid
&& max_ssids
== 1) {
836 * If the driver is limited to 1 SSID at a time interleave
837 * wildcard SSID scans with specific SSID scans to avoid
838 * waiting a long time for a wildcard scan.
840 if (!wpa_s
->prev_scan_wildcard
) {
841 params
.ssids
[0].ssid
= NULL
;
842 params
.ssids
[0].ssid_len
= 0;
843 wpa_s
->prev_scan_wildcard
= 1;
844 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
845 "wildcard SSID (Interleave with specific)");
847 wpa_s
->prev_scan_ssid
= ssid
;
848 wpa_s
->prev_scan_wildcard
= 0;
849 wpa_dbg(wpa_s
, MSG_DEBUG
,
850 "Starting AP scan for specific SSID: %s",
851 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
856 wpa_s
->prev_scan_ssid
= ssid
;
857 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
860 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
861 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
862 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
864 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
866 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
871 #endif /* CONFIG_P2P */
873 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
874 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
876 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
877 wpa_s
->manual_scan_only_new
)
878 params
.only_new_results
= 1;
880 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
881 wpa_s
->manual_scan_freqs
) {
882 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
883 params
.freqs
= wpa_s
->manual_scan_freqs
;
884 wpa_s
->manual_scan_freqs
= NULL
;
887 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
888 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
889 "generated frequency list");
890 params
.freqs
= wpa_s
->next_scan_freqs
;
892 os_free(wpa_s
->next_scan_freqs
);
893 wpa_s
->next_scan_freqs
= NULL
;
894 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
896 /* See if user specified frequencies. If so, scan only those. */
897 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
898 wpa_dbg(wpa_s
, MSG_DEBUG
,
899 "Optimize scan based on conf->freq_list");
900 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
903 /* Use current associated channel? */
904 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
905 unsigned int num
= wpa_s
->num_multichan_concurrent
;
907 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
909 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
911 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
912 "current operating channels since "
913 "scan_cur_freq is enabled");
915 os_free(params
.freqs
);
921 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
922 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
924 params
.extra_ies
= wpabuf_head(extra_ie
);
925 params
.extra_ies_len
= wpabuf_len(extra_ie
);
929 if (wpa_s
->p2p_in_provisioning
|| wpa_s
->p2p_in_invitation
||
930 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
932 * The interface may not yet be in P2P mode, so we have to
933 * explicitly request P2P probe to disable CCK rates.
935 params
.p2p_probe
= 1;
937 #endif /* CONFIG_P2P */
939 scan_params
= ¶ms
;
944 * If the driver does not support multi-channel concurrency and a
945 * virtual interface that shares the same radio with the wpa_s interface
946 * is operating there may not be need to scan other channels apart from
947 * the current operating channel on the other virtual interface. Filter
948 * out other channels in case we are trying to find a connection for a
949 * station interface when we are not configured to prefer station
950 * connection and a concurrent operation is already in process.
952 if (wpa_s
->scan_for_connection
&&
953 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
954 !scan_params
->freqs
&& !params
.freqs
&&
955 wpas_is_p2p_prioritized(wpa_s
) &&
956 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
957 non_p2p_network_enabled(wpa_s
)) {
958 unsigned int num
= wpa_s
->num_multichan_concurrent
;
960 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
962 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
963 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
964 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
966 os_free(params
.freqs
);
971 #endif /* CONFIG_P2P */
973 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
975 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
976 !wpa_s
->manual_scan_freqs
) {
977 /* Restore manual_scan_freqs for the next attempt */
978 wpa_s
->manual_scan_freqs
= params
.freqs
;
982 wpabuf_free(extra_ie
);
983 os_free(params
.freqs
);
984 os_free(params
.filter_ssids
);
987 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
988 if (prev_state
!= wpa_s
->wpa_state
)
989 wpa_supplicant_set_state(wpa_s
, prev_state
);
990 /* Restore scan_req since we will try to scan again */
991 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
992 wpa_supplicant_req_scan(wpa_s
, 1, 0);
994 wpa_s
->scan_for_connection
= 0;
999 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
1001 struct os_reltime remaining
, new_int
;
1004 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
1009 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
1010 new_int
.sec
= remaining
.sec
;
1011 new_int
.usec
= remaining
.usec
;
1015 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
1016 wpa_supplicant_scan
, wpa_s
, NULL
);
1018 wpa_s
->scan_interval
= sec
;
1023 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1024 * @wpa_s: Pointer to wpa_supplicant data
1025 * @sec: Number of seconds after which to scan
1026 * @usec: Number of microseconds after which to scan
1028 * This function is used to schedule a scan for neighboring access points after
1029 * the specified time.
1031 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
1033 int res
= eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
,
1036 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d.%06d sec",
1038 } else if (res
== 0) {
1039 wpa_dbg(wpa_s
, MSG_DEBUG
, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1042 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d.%06d sec",
1044 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
1050 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1051 * @wpa_s: Pointer to wpa_supplicant data
1052 * @sec: Number of seconds after which to scan
1053 * @usec: Number of microseconds after which to scan
1054 * Returns: 0 on success or -1 otherwise
1056 * This function is used to schedule periodic scans for neighboring
1057 * access points after the specified time.
1059 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
1062 if (!wpa_s
->sched_scan_supported
)
1065 eloop_register_timeout(sec
, usec
,
1066 wpa_supplicant_delayed_sched_scan_timeout
,
1074 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1075 * @wpa_s: Pointer to wpa_supplicant data
1076 * Returns: 0 is sched_scan was started or -1 otherwise
1078 * This function is used to schedule periodic scans for neighboring
1079 * access points repeating the scan continuously.
1081 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
1083 struct wpa_driver_scan_params params
;
1084 struct wpa_driver_scan_params
*scan_params
;
1085 enum wpa_states prev_state
;
1086 struct wpa_ssid
*ssid
= NULL
;
1087 struct wpabuf
*extra_ie
= NULL
;
1089 unsigned int max_sched_scan_ssids
;
1093 if (!wpa_s
->sched_scan_supported
)
1096 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
1097 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
1099 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
1100 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
1103 if (wpa_s
->sched_scanning
) {
1104 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
1109 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
1110 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
1111 /* Use wildcard SSID to find this network */
1113 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
1118 if (!wpas_network_disabled(wpa_s
, ssid
) &&
1119 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
1121 * Normal scan is more reliable and faster for WPS
1122 * operations and since these are for short periods of
1123 * time, the benefit of trying to use sched_scan would
1126 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1127 "sched_scan for WPS");
1130 #endif /* CONFIG_WPS */
1135 if (wpa_s
->normal_scans
< 3 &&
1136 (need_ssids
<= wpa_s
->max_scan_ssids
||
1137 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
1139 * When normal scan can speed up operations, use that for the
1140 * first operations before starting the sched_scan to allow
1141 * user space sleep more. We do this only if the normal scan
1142 * has functionality that is suitable for this or if the
1143 * sched_scan does not have better support for multiple SSIDs.
1145 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1146 "sched_scan for initial scans (normal_scans=%d)",
1147 wpa_s
->normal_scans
);
1151 os_memset(¶ms
, 0, sizeof(params
));
1153 /* If we can't allocate space for the filters, we just don't filter */
1154 params
.filter_ssids
= os_calloc(wpa_s
->max_match_sets
,
1155 sizeof(struct wpa_driver_scan_filter
));
1157 prev_state
= wpa_s
->wpa_state
;
1158 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1159 wpa_s
->wpa_state
== WPA_INACTIVE
)
1160 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1162 if (wpa_s
->autoscan_params
!= NULL
) {
1163 scan_params
= wpa_s
->autoscan_params
;
1167 /* Find the starting point from which to continue scanning */
1168 ssid
= wpa_s
->conf
->ssid
;
1169 if (wpa_s
->prev_sched_ssid
) {
1171 if (ssid
== wpa_s
->prev_sched_ssid
) {
1179 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1180 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1181 if (wpa_s
->conf
->sched_scan_interval
)
1182 wpa_s
->sched_scan_interval
=
1183 wpa_s
->conf
->sched_scan_interval
;
1184 if (wpa_s
->sched_scan_interval
== 0)
1185 wpa_s
->sched_scan_interval
= 10;
1186 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1187 wpa_s
->first_sched_scan
= 1;
1188 ssid
= wpa_s
->conf
->ssid
;
1189 wpa_s
->prev_sched_ssid
= ssid
;
1193 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1198 if (wpas_network_disabled(wpa_s
, ssid
))
1201 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1202 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1203 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1204 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1205 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1206 ssid
->ssid
, ssid
->ssid_len
);
1207 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1209 params
.num_filter_ssids
++;
1210 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1212 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1213 "filter for sched_scan - drop filter");
1214 os_free(params
.filter_ssids
);
1215 params
.filter_ssids
= NULL
;
1216 params
.num_filter_ssids
= 0;
1219 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1220 if (params
.num_ssids
== max_sched_scan_ssids
)
1221 break; /* only room for broadcast SSID */
1222 wpa_dbg(wpa_s
, MSG_DEBUG
,
1223 "add to active scan ssid: %s",
1224 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1225 params
.ssids
[params
.num_ssids
].ssid
=
1227 params
.ssids
[params
.num_ssids
].ssid_len
=
1230 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1231 wpa_s
->prev_sched_ssid
= ssid
;
1235 (wpas_network_disabled(wpa_s
, ssid
) ||
1242 wpa_s
->prev_sched_ssid
= ssid
;
1246 if (params
.num_filter_ssids
== 0) {
1247 os_free(params
.filter_ssids
);
1248 params
.filter_ssids
= NULL
;
1251 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1253 params
.extra_ies
= wpabuf_head(extra_ie
);
1254 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1257 if (wpa_s
->conf
->filter_rssi
)
1258 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
1260 /* See if user specified frequencies. If so, scan only those. */
1261 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
1262 wpa_dbg(wpa_s
, MSG_DEBUG
,
1263 "Optimize scan based on conf->freq_list");
1264 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
1267 scan_params
= ¶ms
;
1270 if (ssid
|| !wpa_s
->first_sched_scan
) {
1271 wpa_dbg(wpa_s
, MSG_DEBUG
,
1272 "Starting sched scan: interval %d timeout %d",
1273 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1275 wpa_dbg(wpa_s
, MSG_DEBUG
,
1276 "Starting sched scan: interval %d (no timeout)",
1277 wpa_s
->sched_scan_interval
);
1280 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1282 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1283 wpa_s
->sched_scan_interval
);
1284 wpabuf_free(extra_ie
);
1285 os_free(params
.filter_ssids
);
1287 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1288 if (prev_state
!= wpa_s
->wpa_state
)
1289 wpa_supplicant_set_state(wpa_s
, prev_state
);
1293 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1294 if (ssid
|| !wpa_s
->first_sched_scan
) {
1295 wpa_s
->sched_scan_timed_out
= 0;
1296 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1297 wpa_supplicant_sched_scan_timeout
,
1299 wpa_s
->first_sched_scan
= 0;
1300 wpa_s
->sched_scan_timeout
/= 2;
1301 wpa_s
->sched_scan_interval
*= 2;
1302 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1303 wpa_s
->sched_scan_interval
= 10;
1304 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1308 /* If there is no more ssids, start next time from the beginning */
1310 wpa_s
->prev_sched_ssid
= NULL
;
1317 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1318 * @wpa_s: Pointer to wpa_supplicant data
1320 * This function is used to cancel a scan request scheduled with
1321 * wpa_supplicant_req_scan().
1323 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1325 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1326 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1331 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1332 * @wpa_s: Pointer to wpa_supplicant data
1334 * This function is used to stop a delayed scheduled scan.
1336 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1338 if (!wpa_s
->sched_scan_supported
)
1341 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1342 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1348 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1349 * @wpa_s: Pointer to wpa_supplicant data
1351 * This function is used to stop a periodic scheduled scan.
1353 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1355 if (!wpa_s
->sched_scanning
)
1358 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1359 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1360 wpa_supplicant_stop_sched_scan(wpa_s
);
1365 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1366 * @wpa_s: Pointer to wpa_supplicant data
1367 * @scanning: Whether scanning is currently in progress
1369 * This function is to generate scanning notifycations. It is called whenever
1370 * there may have been a change in scanning (scan started, completed, stopped).
1371 * wpas_notify_scanning() is called whenever the scanning state changed from the
1372 * previously notified state.
1374 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1377 if (wpa_s
->scanning
!= scanning
) {
1378 wpa_s
->scanning
= scanning
;
1379 wpas_notify_scanning(wpa_s
);
1384 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1390 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1391 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1392 if ((ie
[i
+ 2] & 0x7f) > rate
)
1393 rate
= ie
[i
+ 2] & 0x7f;
1396 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1397 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1398 if ((ie
[i
+ 2] & 0x7f) > rate
)
1399 rate
= ie
[i
+ 2] & 0x7f;
1407 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1408 * @res: Scan result entry
1409 * @ie: Information element identitifier (WLAN_EID_*)
1410 * Returns: Pointer to the information element (id field) or %NULL if not found
1412 * This function returns the first matching information element in the scan
1415 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1417 const u8
*end
, *pos
;
1419 pos
= (const u8
*) (res
+ 1);
1420 end
= pos
+ res
->ie_len
;
1422 while (pos
+ 1 < end
) {
1423 if (pos
+ 2 + pos
[1] > end
)
1435 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1436 * @res: Scan result entry
1437 * @vendor_type: Vendor type (four octets starting the IE payload)
1438 * Returns: Pointer to the information element (id field) or %NULL if not found
1440 * This function returns the first matching information element in the scan
1443 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1446 const u8
*end
, *pos
;
1448 pos
= (const u8
*) (res
+ 1);
1449 end
= pos
+ res
->ie_len
;
1451 while (pos
+ 1 < end
) {
1452 if (pos
+ 2 + pos
[1] > end
)
1454 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1455 vendor_type
== WPA_GET_BE32(&pos
[2]))
1465 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1466 * @res: Scan result entry
1467 * @vendor_type: Vendor type (four octets starting the IE payload)
1468 * Returns: Pointer to the information element (id field) or %NULL if not found
1470 * This function returns the first matching information element in the scan
1473 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1474 * from Beacon frames instead of either Beacon or Probe Response frames.
1476 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1479 const u8
*end
, *pos
;
1481 if (res
->beacon_ie_len
== 0)
1484 pos
= (const u8
*) (res
+ 1);
1486 end
= pos
+ res
->beacon_ie_len
;
1488 while (pos
+ 1 < end
) {
1489 if (pos
+ 2 + pos
[1] > end
)
1491 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1492 vendor_type
== WPA_GET_BE32(&pos
[2]))
1502 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1503 * @res: Scan result entry
1504 * @vendor_type: Vendor type (four octets starting the IE payload)
1505 * Returns: Pointer to the information element payload or %NULL if not found
1507 * This function returns concatenated payload of possibly fragmented vendor
1508 * specific information elements in the scan result. The caller is responsible
1509 * for freeing the returned buffer.
1511 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1515 const u8
*end
, *pos
;
1517 buf
= wpabuf_alloc(res
->ie_len
);
1521 pos
= (const u8
*) (res
+ 1);
1522 end
= pos
+ res
->ie_len
;
1524 while (pos
+ 1 < end
) {
1525 if (pos
+ 2 + pos
[1] > end
)
1527 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1528 vendor_type
== WPA_GET_BE32(&pos
[2]))
1529 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1533 if (wpabuf_len(buf
) == 0) {
1543 * Channels with a great SNR can operate at full rate. What is a great SNR?
1544 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1545 * rule of thumb is that any SNR above 20 is good." This one
1546 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1547 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1548 * conservative value.
1550 #define GREAT_SNR 30
1552 /* Compare function for sorting scan results. Return >0 if @b is considered
1554 static int wpa_scan_result_compar(const void *a
, const void *b
)
1556 #define IS_5GHZ(n) (n > 4000)
1557 #define MIN(a,b) a < b ? a : b
1558 struct wpa_scan_res
**_wa
= (void *) a
;
1559 struct wpa_scan_res
**_wb
= (void *) b
;
1560 struct wpa_scan_res
*wa
= *_wa
;
1561 struct wpa_scan_res
*wb
= *_wb
;
1562 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1565 /* WPA/WPA2 support preferred */
1566 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1567 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1568 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1569 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1571 if (wpa_b
&& !wpa_a
)
1573 if (!wpa_b
&& wpa_a
)
1576 /* privacy support preferred */
1577 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1578 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1580 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1581 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1584 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1585 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1586 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1587 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1589 /* Not suitable information to calculate SNR, so use level */
1594 /* best/max rate preferred if SNR close enough */
1595 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1596 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1597 maxrate_a
= wpa_scan_get_max_rate(wa
);
1598 maxrate_b
= wpa_scan_get_max_rate(wb
);
1599 if (maxrate_a
!= maxrate_b
)
1600 return maxrate_b
- maxrate_a
;
1601 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1602 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1605 /* use freq for channel preference */
1607 /* all things being equal, use SNR; if SNRs are
1608 * identical, use quality values since some drivers may only report
1609 * that value and leave the signal level zero */
1611 return wb
->qual
- wa
->qual
;
1612 return snr_b
- snr_a
;
1619 /* Compare function for sorting scan results when searching a WPS AP for
1620 * provisioning. Return >0 if @b is considered better. */
1621 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1623 struct wpa_scan_res
**_wa
= (void *) a
;
1624 struct wpa_scan_res
**_wb
= (void *) b
;
1625 struct wpa_scan_res
*wa
= *_wa
;
1626 struct wpa_scan_res
*wb
= *_wb
;
1627 int uses_wps_a
, uses_wps_b
;
1628 struct wpabuf
*wps_a
, *wps_b
;
1631 /* Optimization - check WPS IE existence before allocated memory and
1632 * doing full reassembly. */
1633 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1634 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1635 if (uses_wps_a
&& !uses_wps_b
)
1637 if (!uses_wps_a
&& uses_wps_b
)
1640 if (uses_wps_a
&& uses_wps_b
) {
1641 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1642 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1643 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1651 * Do not use current AP security policy as a sorting criteria during
1652 * WPS provisioning step since the AP may get reconfigured at the
1653 * completion of provisioning.
1656 /* all things being equal, use signal level; if signal levels are
1657 * identical, use quality values since some drivers may only report
1658 * that value and leave the signal level zero */
1659 if (wb
->level
== wa
->level
)
1660 return wb
->qual
- wa
->qual
;
1661 return wb
->level
- wa
->level
;
1663 #endif /* CONFIG_WPS */
1666 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1668 #ifndef CONFIG_NO_STDOUT_DEBUG
1671 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1674 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1676 for (i
= 0; i
< scan_res
->num
; i
++) {
1677 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1679 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1680 == WPA_SCAN_LEVEL_DBM
) {
1681 int snr
= r
->level
- r
->noise
;
1682 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1683 "noise=%d level=%d snr=%d%s flags=0x%x "
1685 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1686 r
->noise
, r
->level
, snr
,
1687 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1690 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1691 "noise=%d level=%d flags=0x%x age=%u",
1692 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1693 r
->noise
, r
->level
, r
->flags
, r
->age
);
1695 pos
= (u8
*) (r
+ 1);
1697 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1699 if (r
->beacon_ie_len
)
1700 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1701 pos
, r
->beacon_ie_len
);
1703 #endif /* CONFIG_NO_STDOUT_DEBUG */
1708 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1709 * @wpa_s: Pointer to wpa_supplicant data
1710 * @bssid: BSSID to check
1711 * Returns: 0 if the BSSID is filtered or 1 if not
1713 * This function is used to filter out specific BSSIDs from scan reslts mainly
1714 * for testing purposes (SET bssid_filter ctrl_iface command).
1716 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1721 if (wpa_s
->bssid_filter
== NULL
)
1724 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1725 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1734 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1735 struct wpa_scan_results
*res
)
1739 if (wpa_s
->bssid_filter
== NULL
)
1742 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1743 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1744 res
->res
[i
]->bssid
)) {
1745 res
->res
[j
++] = res
->res
[i
];
1747 os_free(res
->res
[i
]);
1752 if (res
->num
!= j
) {
1753 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1754 (int) (res
->num
- j
));
1761 * wpa_supplicant_get_scan_results - Get scan results
1762 * @wpa_s: Pointer to wpa_supplicant data
1763 * @info: Information about what was scanned or %NULL if not available
1764 * @new_scan: Whether a new scan was performed
1765 * Returns: Scan results, %NULL on failure
1767 * This function request the current scan results from the driver and updates
1768 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1769 * results with wpa_scan_results_free().
1771 struct wpa_scan_results
*
1772 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1773 struct scan_info
*info
, int new_scan
)
1775 struct wpa_scan_results
*scan_res
;
1777 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1779 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1780 if (scan_res
== NULL
) {
1781 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1784 if (scan_res
->fetch_time
.sec
== 0) {
1786 * Make sure we have a valid timestamp if the driver wrapper
1787 * does not set this.
1789 os_get_reltime(&scan_res
->fetch_time
);
1791 filter_scan_res(wpa_s
, scan_res
);
1794 if (wpas_wps_searching(wpa_s
)) {
1795 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1796 "provisioning rules");
1797 compar
= wpa_scan_result_wps_compar
;
1799 #endif /* CONFIG_WPS */
1801 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1803 dump_scan_res(scan_res
);
1805 wpa_bss_update_start(wpa_s
);
1806 for (i
= 0; i
< scan_res
->num
; i
++)
1807 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1808 &scan_res
->fetch_time
);
1809 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1816 * wpa_supplicant_update_scan_results - Update scan results from the driver
1817 * @wpa_s: Pointer to wpa_supplicant data
1818 * Returns: 0 on success, -1 on failure
1820 * This function updates the BSS table within wpa_supplicant based on the
1821 * currently available scan results from the driver without requesting a new
1822 * scan. This is used in cases where the driver indicates an association
1823 * (including roaming within ESS) and wpa_supplicant does not yet have the
1824 * needed information to complete the connection (e.g., to perform validation
1825 * steps in 4-way handshake).
1827 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1829 struct wpa_scan_results
*scan_res
;
1830 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1831 if (scan_res
== NULL
)
1833 wpa_scan_results_free(scan_res
);
1840 * scan_only_handler - Reports scan results
1842 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1843 struct wpa_scan_results
*scan_res
)
1845 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1846 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
1847 wpa_s
->manual_scan_use_id
&& wpa_s
->own_scan_running
) {
1848 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
"id=%u",
1849 wpa_s
->manual_scan_id
);
1850 wpa_s
->manual_scan_use_id
= 0;
1852 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1854 wpas_notify_scan_results(wpa_s
);
1855 wpas_notify_scan_done(wpa_s
, 1);
1856 if (wpa_s
->scan_work
) {
1857 struct wpa_radio_work
*work
= wpa_s
->scan_work
;
1858 wpa_s
->scan_work
= NULL
;
1859 radio_work_done(work
);
1864 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1866 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);
1870 struct wpa_driver_scan_params
*
1871 wpa_scan_clone_params(const struct wpa_driver_scan_params
*src
)
1873 struct wpa_driver_scan_params
*params
;
1877 params
= os_zalloc(sizeof(*params
));
1881 for (i
= 0; i
< src
->num_ssids
; i
++) {
1882 if (src
->ssids
[i
].ssid
) {
1883 n
= os_malloc(src
->ssids
[i
].ssid_len
);
1886 os_memcpy(n
, src
->ssids
[i
].ssid
,
1887 src
->ssids
[i
].ssid_len
);
1888 params
->ssids
[i
].ssid
= n
;
1889 params
->ssids
[i
].ssid_len
= src
->ssids
[i
].ssid_len
;
1892 params
->num_ssids
= src
->num_ssids
;
1894 if (src
->extra_ies
) {
1895 n
= os_malloc(src
->extra_ies_len
);
1898 os_memcpy(n
, src
->extra_ies
, src
->extra_ies_len
);
1899 params
->extra_ies
= n
;
1900 params
->extra_ies_len
= src
->extra_ies_len
;
1904 int len
= int_array_len(src
->freqs
);
1905 params
->freqs
= os_malloc((len
+ 1) * sizeof(int));
1906 if (params
->freqs
== NULL
)
1908 os_memcpy(params
->freqs
, src
->freqs
, (len
+ 1) * sizeof(int));
1911 if (src
->filter_ssids
) {
1912 params
->filter_ssids
= os_malloc(sizeof(*params
->filter_ssids
) *
1913 src
->num_filter_ssids
);
1914 if (params
->filter_ssids
== NULL
)
1916 os_memcpy(params
->filter_ssids
, src
->filter_ssids
,
1917 sizeof(*params
->filter_ssids
) *
1918 src
->num_filter_ssids
);
1919 params
->num_filter_ssids
= src
->num_filter_ssids
;
1922 params
->filter_rssi
= src
->filter_rssi
;
1923 params
->p2p_probe
= src
->p2p_probe
;
1924 params
->only_new_results
= src
->only_new_results
;
1925 params
->low_priority
= src
->low_priority
;
1930 wpa_scan_free_params(params
);
1935 void wpa_scan_free_params(struct wpa_driver_scan_params
*params
)
1942 for (i
= 0; i
< params
->num_ssids
; i
++)
1943 os_free((u8
*) params
->ssids
[i
].ssid
);
1944 os_free((u8
*) params
->extra_ies
);
1945 os_free(params
->freqs
);
1946 os_free(params
->filter_ssids
);
1951 int wpas_start_pno(struct wpa_supplicant
*wpa_s
)
1954 size_t i
, num_ssid
, num_match_ssid
;
1955 struct wpa_ssid
*ssid
;
1956 struct wpa_driver_scan_params params
;
1958 if (!wpa_s
->sched_scan_supported
)
1961 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
)
1964 if ((wpa_s
->wpa_state
> WPA_SCANNING
) &&
1965 (wpa_s
->wpa_state
<= WPA_COMPLETED
)) {
1966 wpa_printf(MSG_ERROR
, "PNO: In assoc process");
1970 if (wpa_s
->wpa_state
== WPA_SCANNING
) {
1971 wpa_supplicant_cancel_scan(wpa_s
);
1972 if (wpa_s
->sched_scanning
) {
1973 wpa_printf(MSG_DEBUG
, "Schedule PNO on completion of "
1974 "ongoing sched scan");
1975 wpa_supplicant_cancel_sched_scan(wpa_s
);
1976 wpa_s
->pno_sched_pending
= 1;
1981 os_memset(¶ms
, 0, sizeof(params
));
1983 num_ssid
= num_match_ssid
= 0;
1984 ssid
= wpa_s
->conf
->ssid
;
1986 if (!wpas_network_disabled(wpa_s
, ssid
)) {
1988 if (ssid
->scan_ssid
)
1994 if (num_match_ssid
== 0) {
1995 wpa_printf(MSG_DEBUG
, "PNO: No configured SSIDs");
1999 if (num_match_ssid
> num_ssid
) {
2000 params
.num_ssids
++; /* wildcard */
2004 if (num_ssid
> WPAS_MAX_SCAN_SSIDS
) {
2005 wpa_printf(MSG_DEBUG
, "PNO: Use only the first %u SSIDs from "
2006 "%u", WPAS_MAX_SCAN_SSIDS
, (unsigned int) num_ssid
);
2007 num_ssid
= WPAS_MAX_SCAN_SSIDS
;
2010 if (num_match_ssid
> wpa_s
->max_match_sets
) {
2011 num_match_ssid
= wpa_s
->max_match_sets
;
2012 wpa_dbg(wpa_s
, MSG_DEBUG
, "PNO: Too many SSIDs to match");
2014 params
.filter_ssids
= os_calloc(num_match_ssid
,
2015 sizeof(struct wpa_driver_scan_filter
));
2016 if (params
.filter_ssids
== NULL
)
2019 ssid
= wpa_s
->conf
->ssid
;
2021 if (!wpas_network_disabled(wpa_s
, ssid
)) {
2022 if (ssid
->scan_ssid
&& params
.num_ssids
< num_ssid
) {
2023 params
.ssids
[params
.num_ssids
].ssid
=
2025 params
.ssids
[params
.num_ssids
].ssid_len
=
2029 os_memcpy(params
.filter_ssids
[i
].ssid
, ssid
->ssid
,
2031 params
.filter_ssids
[i
].ssid_len
= ssid
->ssid_len
;
2032 params
.num_filter_ssids
++;
2034 if (i
== num_match_ssid
)
2040 if (wpa_s
->conf
->filter_rssi
)
2041 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
2043 interval
= wpa_s
->conf
->sched_scan_interval
?
2044 wpa_s
->conf
->sched_scan_interval
: 10;
2046 if (params
.freqs
== NULL
&& wpa_s
->manual_sched_scan_freqs
) {
2047 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit sched scan to specified channels");
2048 params
.freqs
= wpa_s
->manual_sched_scan_freqs
;
2051 ret
= wpa_supplicant_start_sched_scan(wpa_s
, ¶ms
, interval
);
2052 os_free(params
.filter_ssids
);
2056 wpa_msg(wpa_s
, MSG_ERROR
, "Failed to schedule PNO");
2061 int wpas_stop_pno(struct wpa_supplicant
*wpa_s
)
2068 ret
= wpa_supplicant_stop_sched_scan(wpa_s
);
2071 wpa_s
->pno_sched_pending
= 0;
2073 if (wpa_s
->wpa_state
== WPA_SCANNING
)
2074 wpa_supplicant_req_scan(wpa_s
, 0, 0);