2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2012, 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"
27 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant
*wpa_s
)
29 struct wpa_ssid
*ssid
;
30 union wpa_event_data data
;
32 ssid
= wpa_supplicant_get_ssid(wpa_s
);
36 if (wpa_s
->current_ssid
== NULL
) {
37 wpa_s
->current_ssid
= ssid
;
38 if (wpa_s
->current_ssid
!= NULL
)
39 wpas_notify_network_changed(wpa_s
);
41 wpa_supplicant_initiate_eapol(wpa_s
);
42 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already associated with a configured "
43 "network - generating associated event");
44 os_memset(&data
, 0, sizeof(data
));
45 wpa_supplicant_event(wpa_s
, EVENT_ASSOC
, &data
);
50 static int wpas_wps_in_use(struct wpa_supplicant
*wpa_s
,
51 enum wps_request_type
*req_type
)
53 struct wpa_ssid
*ssid
;
56 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
57 if (!(ssid
->key_mgmt
& WPA_KEY_MGMT_WPS
))
61 *req_type
= wpas_wps_get_req_type(ssid
);
62 if (!ssid
->eap
.phase1
)
65 if (os_strstr(ssid
->eap
.phase1
, "pbc=1"))
70 if (!wpa_s
->global
->p2p_disabled
&& wpa_s
->global
->p2p
&&
71 !wpa_s
->conf
->p2p_disabled
) {
72 wpa_s
->wps
->dev
.p2p
= 1;
75 *req_type
= WPS_REQ_ENROLLEE_INFO
;
78 #endif /* CONFIG_P2P */
82 #endif /* CONFIG_WPS */
86 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
87 * @wpa_s: Pointer to wpa_supplicant data
88 * Returns: 0 if no networks are enabled, >0 if networks are enabled
90 * This function is used to figure out whether any networks (or Interworking
91 * with enabled credentials and auto_interworking) are present in the current
94 int wpa_supplicant_enabled_networks(struct wpa_supplicant
*wpa_s
)
96 struct wpa_ssid
*ssid
= wpa_s
->conf
->ssid
;
97 int count
= 0, disabled
= 0;
99 if (!wpas_network_disabled(wpa_s
, ssid
))
105 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
106 wpa_s
->conf
->auto_interworking
)
108 if (count
== 0 && disabled
> 0) {
109 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks (%d disabled "
110 "networks)", disabled
);
116 static void wpa_supplicant_assoc_try(struct wpa_supplicant
*wpa_s
,
117 struct wpa_ssid
*ssid
)
120 if (!wpas_network_disabled(wpa_s
, ssid
))
125 /* ap_scan=2 mode - try to associate with each SSID. */
127 wpa_dbg(wpa_s
, MSG_DEBUG
, "wpa_supplicant_assoc_try: Reached "
128 "end of scan list - go back to beginning");
129 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
130 wpa_supplicant_req_scan(wpa_s
, 0, 0);
134 /* Continue from the next SSID on the next attempt. */
135 wpa_s
->prev_scan_ssid
= ssid
;
137 /* Start from the beginning of the SSID list. */
138 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
140 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
144 static int int_array_len(const int *a
)
147 for (i
= 0; a
&& a
[i
]; i
++)
153 static void int_array_concat(int **res
, const int *a
)
158 reslen
= int_array_len(*res
);
159 alen
= int_array_len(a
);
161 n
= os_realloc_array(*res
, reslen
+ alen
+ 1, sizeof(int));
167 for (i
= 0; i
<= alen
; i
++)
168 n
[reslen
+ i
] = a
[i
];
173 static int freq_cmp(const void *a
, const void *b
)
186 static void int_array_sort_unique(int *a
)
194 alen
= int_array_len(a
);
195 qsort(a
, alen
, sizeof(int), freq_cmp
);
199 while (a
[i
] && a
[j
]) {
213 * wpa_supplicant_trigger_scan - Request driver to start a scan
214 * @wpa_s: Pointer to wpa_supplicant data
215 * @params: Scan parameters
216 * Returns: 0 on success, -1 on failure
218 int wpa_supplicant_trigger_scan(struct wpa_supplicant
*wpa_s
,
219 struct wpa_driver_scan_params
*params
)
223 wpa_supplicant_notify_scanning(wpa_s
, 1);
225 ret
= wpa_drv_scan(wpa_s
, params
);
227 wpa_supplicant_notify_scanning(wpa_s
, 0);
228 wpas_notify_scan_done(wpa_s
, 0);
230 os_get_time(&wpa_s
->scan_trigger_time
);
232 wpa_s
->normal_scans
++;
240 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
242 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
244 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting delayed sched scan");
246 if (wpa_supplicant_req_sched_scan(wpa_s
))
247 wpa_supplicant_req_scan(wpa_s
, 0, 0);
252 wpa_supplicant_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
254 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
256 wpa_dbg(wpa_s
, MSG_DEBUG
, "Sched scan timeout - stopping it");
258 wpa_s
->sched_scan_timed_out
= 1;
259 wpa_supplicant_cancel_sched_scan(wpa_s
);
264 wpa_supplicant_start_sched_scan(struct wpa_supplicant
*wpa_s
,
265 struct wpa_driver_scan_params
*params
,
270 wpa_supplicant_notify_scanning(wpa_s
, 1);
271 ret
= wpa_drv_sched_scan(wpa_s
, params
, interval
* 1000);
273 wpa_supplicant_notify_scanning(wpa_s
, 0);
275 wpa_s
->sched_scanning
= 1;
281 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant
*wpa_s
)
285 ret
= wpa_drv_stop_sched_scan(wpa_s
);
287 wpa_dbg(wpa_s
, MSG_DEBUG
, "stopping sched_scan failed!");
288 /* TODO: what to do if stopping fails? */
296 static struct wpa_driver_scan_filter
*
297 wpa_supplicant_build_filter_ssids(struct wpa_config
*conf
, size_t *num_ssids
)
299 struct wpa_driver_scan_filter
*ssids
;
300 struct wpa_ssid
*ssid
;
304 if (!conf
->filter_ssids
)
307 for (count
= 0, ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
308 if (ssid
->ssid
&& ssid
->ssid_len
)
313 ssids
= os_zalloc(count
* sizeof(struct wpa_driver_scan_filter
));
317 for (ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
318 if (!ssid
->ssid
|| !ssid
->ssid_len
)
320 os_memcpy(ssids
[*num_ssids
].ssid
, ssid
->ssid
, ssid
->ssid_len
);
321 ssids
[*num_ssids
].ssid_len
= ssid
->ssid_len
;
329 static void wpa_supplicant_optimize_freqs(
330 struct wpa_supplicant
*wpa_s
, struct wpa_driver_scan_params
*params
)
333 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_provisioning
&&
335 /* Optimize provisioning state scan based on GO information */
336 if (wpa_s
->p2p_in_provisioning
< 5 &&
337 wpa_s
->go_params
->freq
> 0) {
338 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO "
339 "preferred frequency %d MHz",
340 wpa_s
->go_params
->freq
);
341 params
->freqs
= os_zalloc(2 * sizeof(int));
343 params
->freqs
[0] = wpa_s
->go_params
->freq
;
344 } else if (wpa_s
->p2p_in_provisioning
< 8 &&
345 wpa_s
->go_params
->freq_list
[0]) {
346 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only common "
348 int_array_concat(¶ms
->freqs
,
349 wpa_s
->go_params
->freq_list
);
351 int_array_sort_unique(params
->freqs
);
353 wpa_s
->p2p_in_provisioning
++;
355 #endif /* CONFIG_P2P */
358 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
360 * Optimize post-provisioning scan based on channel used
361 * during provisioning.
363 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
364 "that was used during provisioning", wpa_s
->wps_freq
);
365 params
->freqs
= os_zalloc(2 * sizeof(int));
367 params
->freqs
[0] = wpa_s
->wps_freq
;
371 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
373 /* Optimize provisioning scan based on already known channel */
374 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
376 params
->freqs
= os_zalloc(2 * sizeof(int));
378 params
->freqs
[0] = wpa_s
->wps_freq
;
379 wpa_s
->known_wps_freq
= 0; /* only do this once */
381 #endif /* CONFIG_WPS */
385 #ifdef CONFIG_INTERWORKING
386 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
389 if (wpa_s
->conf
->interworking
== 0)
392 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
393 wpabuf_put_u8(buf
, 4);
394 wpabuf_put_u8(buf
, 0x00);
395 wpabuf_put_u8(buf
, 0x00);
396 wpabuf_put_u8(buf
, 0x00);
397 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
399 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
400 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
402 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
404 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
405 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
407 #endif /* CONFIG_INTERWORKING */
410 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
412 struct wpabuf
*extra_ie
= NULL
;
415 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
416 #endif /* CONFIG_WPS */
418 #ifdef CONFIG_INTERWORKING
419 if (wpa_s
->conf
->interworking
&&
420 wpabuf_resize(&extra_ie
, 100) == 0)
421 wpas_add_interworking_elements(wpa_s
, extra_ie
);
422 #endif /* CONFIG_INTERWORKING */
425 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
428 struct wpabuf
*wps_ie
;
429 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
432 wpa_s
->wps
->uuid
, req_type
,
435 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
436 wpabuf_put_buf(extra_ie
, wps_ie
);
443 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
444 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
445 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
447 #endif /* CONFIG_P2P */
449 #endif /* CONFIG_WPS */
452 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
453 wpas_hs20_add_indication(extra_ie
);
454 #endif /* CONFIG_HS20 */
463 * Check whether there are any enabled networks or credentials that could be
464 * used for a non-P2P connection.
466 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
468 struct wpa_ssid
*ssid
;
470 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
471 if (wpas_network_disabled(wpa_s
, ssid
))
473 if (!ssid
->p2p_group
)
477 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
478 wpa_s
->conf
->auto_interworking
)
484 #endif /* CONFIG_P2P */
487 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
489 enum hostapd_hw_mode mode
)
493 for (i
= 0; i
< num_modes
; i
++) {
494 if (modes
[i
].mode
== mode
)
502 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
503 enum hostapd_hw_mode band
,
504 struct wpa_driver_scan_params
*params
)
506 /* Include only supported channels for the specified band */
507 struct hostapd_hw_modes
*mode
;
510 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
512 /* No channels supported in this band - use empty list */
513 params
->freqs
= os_zalloc(sizeof(int));
517 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
518 if (params
->freqs
== NULL
)
520 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
521 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
523 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
528 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
529 struct wpa_driver_scan_params
*params
)
531 if (wpa_s
->hw
.modes
== NULL
)
532 return; /* unknown what channels the driver supports */
534 return; /* already using a limited channel set */
535 if (wpa_s
->setband
== WPA_SETBAND_5G
)
536 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
538 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
539 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
544 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
546 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
547 struct wpa_ssid
*ssid
;
548 enum scan_req_type scan_req
= NORMAL_SCAN_REQ
;
550 struct wpabuf
*extra_ie
= NULL
;
551 struct wpa_driver_scan_params params
;
552 struct wpa_driver_scan_params
*scan_params
;
554 enum wpa_states prev_state
;
556 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
557 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
558 wpas_p2p_continue_after_scan(wpa_s
);
562 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
563 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
564 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
565 wpas_p2p_continue_after_scan(wpa_s
);
569 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
570 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
571 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
572 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
573 wpas_p2p_continue_after_scan(wpa_s
);
577 if (wpa_s
->conf
->ap_scan
!= 0 &&
578 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
579 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
580 "overriding ap_scan configuration");
581 wpa_s
->conf
->ap_scan
= 0;
582 wpas_notify_ap_scan_changed(wpa_s
);
585 if (wpa_s
->conf
->ap_scan
== 0) {
586 wpa_supplicant_gen_assoc_event(wpa_s
);
591 if (wpas_p2p_in_progress(wpa_s
) || wpas_wpa_is_in_progress(wpa_s
)) {
592 if (wpa_s
->sta_scan_pending
&&
593 wpas_p2p_in_progress(wpa_s
) == 2 &&
594 wpa_s
->global
->p2p_cb_on_scan_complete
) {
595 wpa_dbg(wpa_s
, MSG_DEBUG
, "Process pending station "
596 "mode scan during P2P search");
598 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan "
599 "while P2P operation is in progress");
600 wpa_s
->sta_scan_pending
= 1;
601 wpa_supplicant_req_scan(wpa_s
, 5, 0);
605 #endif /* CONFIG_P2P */
607 if (wpa_s
->conf
->ap_scan
== 2)
610 max_ssids
= wpa_s
->max_scan_ssids
;
611 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
612 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
615 scan_req
= wpa_s
->scan_req
;
616 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
618 os_memset(¶ms
, 0, sizeof(params
));
620 prev_state
= wpa_s
->wpa_state
;
621 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
622 wpa_s
->wpa_state
== WPA_INACTIVE
)
623 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
626 * If autoscan has set its own scanning parameters
628 if (wpa_s
->autoscan_params
!= NULL
) {
629 scan_params
= wpa_s
->autoscan_params
;
633 if (scan_req
!= MANUAL_SCAN_REQ
&& wpa_s
->connect_without_scan
) {
634 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
635 if (ssid
== wpa_s
->connect_without_scan
)
638 wpa_s
->connect_without_scan
= NULL
;
640 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
641 "without scan step");
642 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
648 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
650 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during "
651 "P2P group formation");
652 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
653 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
654 params
.num_ssids
= 1;
657 #endif /* CONFIG_P2P */
659 /* Find the starting point from which to continue scanning */
660 ssid
= wpa_s
->conf
->ssid
;
661 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
663 if (ssid
== wpa_s
->prev_scan_ssid
) {
671 if (scan_req
!= MANUAL_SCAN_REQ
&& wpa_s
->conf
->ap_scan
== 2) {
672 wpa_s
->connect_without_scan
= NULL
;
673 wpa_s
->prev_scan_wildcard
= 0;
674 wpa_supplicant_assoc_try(wpa_s
, ssid
);
676 } else if (wpa_s
->conf
->ap_scan
== 2) {
678 * User-initiated scan request in ap_scan == 2; scan with
683 struct wpa_ssid
*start
= ssid
, *tssid
;
685 if (ssid
== NULL
&& max_ssids
> 1)
686 ssid
= wpa_s
->conf
->ssid
;
688 if (!wpas_network_disabled(wpa_s
, ssid
) &&
690 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
691 ssid
->ssid
, ssid
->ssid_len
);
692 params
.ssids
[params
.num_ssids
].ssid
=
694 params
.ssids
[params
.num_ssids
].ssid_len
=
697 if (params
.num_ssids
+ 1 >= max_ssids
)
703 if (ssid
== NULL
&& max_ssids
> 1 &&
704 start
!= wpa_s
->conf
->ssid
)
705 ssid
= wpa_s
->conf
->ssid
;
708 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
709 if (wpas_network_disabled(wpa_s
, tssid
))
711 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
712 int_array_concat(¶ms
.freqs
,
715 os_free(params
.freqs
);
720 int_array_sort_unique(params
.freqs
);
723 if (ssid
&& max_ssids
== 1) {
725 * If the driver is limited to 1 SSID at a time interleave
726 * wildcard SSID scans with specific SSID scans to avoid
727 * waiting a long time for a wildcard scan.
729 if (!wpa_s
->prev_scan_wildcard
) {
730 params
.ssids
[0].ssid
= NULL
;
731 params
.ssids
[0].ssid_len
= 0;
732 wpa_s
->prev_scan_wildcard
= 1;
733 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
734 "wildcard SSID (Interleave with specific)");
736 wpa_s
->prev_scan_ssid
= ssid
;
737 wpa_s
->prev_scan_wildcard
= 0;
738 wpa_dbg(wpa_s
, MSG_DEBUG
,
739 "Starting AP scan for specific SSID: %s",
740 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
745 wpa_s
->prev_scan_ssid
= ssid
;
746 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
750 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
752 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
757 #endif /* CONFIG_P2P */
759 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
760 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
762 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
763 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
764 "generated frequency list");
765 params
.freqs
= wpa_s
->next_scan_freqs
;
767 os_free(wpa_s
->next_scan_freqs
);
768 wpa_s
->next_scan_freqs
= NULL
;
769 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
771 /* See if user specified frequencies. If so, scan only those. */
772 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
773 wpa_dbg(wpa_s
, MSG_DEBUG
,
774 "Optimize scan based on conf->freq_list");
775 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
778 /* Use current associated channel? */
779 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
780 unsigned int num
= wpa_s
->num_multichan_concurrent
;
782 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
784 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
786 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
787 "current operating channels since "
788 "scan_cur_freq is enabled");
790 os_free(params
.freqs
);
796 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
797 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
799 params
.extra_ies
= wpabuf_head(extra_ie
);
800 params
.extra_ies_len
= wpabuf_len(extra_ie
);
804 if (wpa_s
->p2p_in_provisioning
||
805 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
807 * The interface may not yet be in P2P mode, so we have to
808 * explicitly request P2P probe to disable CCK rates.
810 params
.p2p_probe
= 1;
812 #endif /* CONFIG_P2P */
814 scan_params
= ¶ms
;
819 * If the driver does not support multi-channel concurrency and a
820 * virtual interface that shares the same radio with the wpa_s interface
821 * is operating there may not be need to scan other channels apart from
822 * the current operating channel on the other virtual interface. Filter
823 * out other channels in case we are trying to find a connection for a
824 * station interface when we are not configured to prefer station
825 * connection and a concurrent operation is already in process.
827 if (wpa_s
->scan_for_connection
&& scan_req
== NORMAL_SCAN_REQ
&&
828 !scan_params
->freqs
&& !params
.freqs
&&
829 wpas_is_p2p_prioritized(wpa_s
) &&
830 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
831 non_p2p_network_enabled(wpa_s
)) {
832 unsigned int num
= wpa_s
->num_multichan_concurrent
;
834 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
836 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
837 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
838 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
840 os_free(params
.freqs
);
845 #endif /* CONFIG_P2P */
847 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
849 wpabuf_free(extra_ie
);
850 os_free(params
.freqs
);
851 os_free(params
.filter_ssids
);
854 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
855 if (prev_state
!= wpa_s
->wpa_state
)
856 wpa_supplicant_set_state(wpa_s
, prev_state
);
857 /* Restore scan_req since we will try to scan again */
858 wpa_s
->scan_req
= scan_req
;
859 wpa_supplicant_req_scan(wpa_s
, 1, 0);
861 wpa_s
->scan_for_connection
= 0;
866 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
868 struct os_time remaining
, new_int
;
871 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
876 if (cancelled
&& os_time_before(&remaining
, &new_int
)) {
877 new_int
.sec
= remaining
.sec
;
878 new_int
.usec
= remaining
.usec
;
881 eloop_register_timeout(new_int
.sec
, new_int
.usec
, wpa_supplicant_scan
,
883 wpa_s
->scan_interval
= sec
;
888 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
889 * @wpa_s: Pointer to wpa_supplicant data
890 * @sec: Number of seconds after which to scan
891 * @usec: Number of microseconds after which to scan
893 * This function is used to schedule a scan for neighboring access points after
894 * the specified time.
896 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
898 /* If there's at least one network that should be specifically scanned
899 * then don't cancel the scan and reschedule. Some drivers do
900 * background scanning which generates frequent scan results, and that
901 * causes the specific SSID scan to get continually pushed back and
902 * never happen, which causes hidden APs to never get probe-scanned.
904 if (eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
) &&
905 wpa_s
->conf
->ap_scan
== 1) {
906 struct wpa_ssid
*ssid
= wpa_s
->conf
->ssid
;
909 if (!wpas_network_disabled(wpa_s
, ssid
) &&
915 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not rescheduling scan to "
916 "ensure that specific SSID scans occur");
921 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d sec %d usec",
923 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
924 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
929 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
930 * @wpa_s: Pointer to wpa_supplicant data
931 * @sec: Number of seconds after which to scan
932 * @usec: Number of microseconds after which to scan
933 * Returns: 0 on success or -1 otherwise
935 * This function is used to schedule periodic scans for neighboring
936 * access points after the specified time.
938 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
941 if (!wpa_s
->sched_scan_supported
)
944 eloop_register_timeout(sec
, usec
,
945 wpa_supplicant_delayed_sched_scan_timeout
,
953 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
954 * @wpa_s: Pointer to wpa_supplicant data
955 * Returns: 0 is sched_scan was started or -1 otherwise
957 * This function is used to schedule periodic scans for neighboring
958 * access points repeating the scan continuously.
960 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
962 struct wpa_driver_scan_params params
;
963 struct wpa_driver_scan_params
*scan_params
;
964 enum wpa_states prev_state
;
965 struct wpa_ssid
*ssid
= NULL
;
966 struct wpabuf
*extra_ie
= NULL
;
968 unsigned int max_sched_scan_ssids
;
972 if (!wpa_s
->sched_scan_supported
)
975 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
976 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
978 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
979 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
982 if (wpa_s
->sched_scanning
) {
983 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
988 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
989 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
990 /* Use wildcard SSID to find this network */
992 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
997 if (!wpas_network_disabled(wpa_s
, ssid
) &&
998 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
1000 * Normal scan is more reliable and faster for WPS
1001 * operations and since these are for short periods of
1002 * time, the benefit of trying to use sched_scan would
1005 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1006 "sched_scan for WPS");
1009 #endif /* CONFIG_WPS */
1014 if (wpa_s
->normal_scans
< 3 &&
1015 (need_ssids
<= wpa_s
->max_scan_ssids
||
1016 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
1018 * When normal scan can speed up operations, use that for the
1019 * first operations before starting the sched_scan to allow
1020 * user space sleep more. We do this only if the normal scan
1021 * has functionality that is suitable for this or if the
1022 * sched_scan does not have better support for multiple SSIDs.
1024 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1025 "sched_scan for initial scans (normal_scans=%d)",
1026 wpa_s
->normal_scans
);
1030 os_memset(¶ms
, 0, sizeof(params
));
1032 /* If we can't allocate space for the filters, we just don't filter */
1033 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
1034 sizeof(struct wpa_driver_scan_filter
));
1036 prev_state
= wpa_s
->wpa_state
;
1037 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1038 wpa_s
->wpa_state
== WPA_INACTIVE
)
1039 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1041 if (wpa_s
->autoscan_params
!= NULL
) {
1042 scan_params
= wpa_s
->autoscan_params
;
1046 /* Find the starting point from which to continue scanning */
1047 ssid
= wpa_s
->conf
->ssid
;
1048 if (wpa_s
->prev_sched_ssid
) {
1050 if (ssid
== wpa_s
->prev_sched_ssid
) {
1058 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1059 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1060 if (wpa_s
->conf
->sched_scan_interval
)
1061 wpa_s
->sched_scan_interval
=
1062 wpa_s
->conf
->sched_scan_interval
;
1063 if (wpa_s
->sched_scan_interval
== 0)
1064 wpa_s
->sched_scan_interval
= 10;
1065 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1066 wpa_s
->first_sched_scan
= 1;
1067 ssid
= wpa_s
->conf
->ssid
;
1068 wpa_s
->prev_sched_ssid
= ssid
;
1072 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1077 if (wpas_network_disabled(wpa_s
, ssid
))
1080 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1081 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1082 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1083 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1084 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1085 ssid
->ssid
, ssid
->ssid_len
);
1086 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1088 params
.num_filter_ssids
++;
1089 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1091 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1092 "filter for sched_scan - drop filter");
1093 os_free(params
.filter_ssids
);
1094 params
.filter_ssids
= NULL
;
1095 params
.num_filter_ssids
= 0;
1098 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1099 if (params
.num_ssids
== max_sched_scan_ssids
)
1100 break; /* only room for broadcast SSID */
1101 wpa_dbg(wpa_s
, MSG_DEBUG
,
1102 "add to active scan ssid: %s",
1103 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1104 params
.ssids
[params
.num_ssids
].ssid
=
1106 params
.ssids
[params
.num_ssids
].ssid_len
=
1109 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1110 wpa_s
->prev_sched_ssid
= ssid
;
1114 (wpas_network_disabled(wpa_s
, ssid
) ||
1121 wpa_s
->prev_sched_ssid
= ssid
;
1125 if (params
.num_filter_ssids
== 0) {
1126 os_free(params
.filter_ssids
);
1127 params
.filter_ssids
= NULL
;
1130 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1132 params
.extra_ies
= wpabuf_head(extra_ie
);
1133 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1136 scan_params
= ¶ms
;
1139 if (ssid
|| !wpa_s
->first_sched_scan
) {
1140 wpa_dbg(wpa_s
, MSG_DEBUG
,
1141 "Starting sched scan: interval %d timeout %d",
1142 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1144 wpa_dbg(wpa_s
, MSG_DEBUG
,
1145 "Starting sched scan: interval %d (no timeout)",
1146 wpa_s
->sched_scan_interval
);
1149 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1151 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1152 wpa_s
->sched_scan_interval
);
1153 wpabuf_free(extra_ie
);
1154 os_free(params
.filter_ssids
);
1156 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1157 if (prev_state
!= wpa_s
->wpa_state
)
1158 wpa_supplicant_set_state(wpa_s
, prev_state
);
1162 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1163 if (ssid
|| !wpa_s
->first_sched_scan
) {
1164 wpa_s
->sched_scan_timed_out
= 0;
1165 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1166 wpa_supplicant_sched_scan_timeout
,
1168 wpa_s
->first_sched_scan
= 0;
1169 wpa_s
->sched_scan_timeout
/= 2;
1170 wpa_s
->sched_scan_interval
*= 2;
1171 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1172 wpa_s
->sched_scan_interval
= 10;
1173 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1177 /* If there is no more ssids, start next time from the beginning */
1179 wpa_s
->prev_sched_ssid
= NULL
;
1186 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1187 * @wpa_s: Pointer to wpa_supplicant data
1189 * This function is used to cancel a scan request scheduled with
1190 * wpa_supplicant_req_scan().
1192 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1194 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1195 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1196 wpas_p2p_continue_after_scan(wpa_s
);
1201 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1202 * @wpa_s: Pointer to wpa_supplicant data
1204 * This function is used to stop a delayed scheduled scan.
1206 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1208 if (!wpa_s
->sched_scan_supported
)
1211 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1212 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1218 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1219 * @wpa_s: Pointer to wpa_supplicant data
1221 * This function is used to stop a periodic scheduled scan.
1223 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1225 if (!wpa_s
->sched_scanning
)
1228 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1229 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1230 wpa_supplicant_stop_sched_scan(wpa_s
);
1235 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1236 * @wpa_s: Pointer to wpa_supplicant data
1237 * @scanning: Whether scanning is currently in progress
1239 * This function is to generate scanning notifycations. It is called whenever
1240 * there may have been a change in scanning (scan started, completed, stopped).
1241 * wpas_notify_scanning() is called whenever the scanning state changed from the
1242 * previously notified state.
1244 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1247 if (wpa_s
->scanning
!= scanning
) {
1248 wpa_s
->scanning
= scanning
;
1249 wpas_notify_scanning(wpa_s
);
1254 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1260 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1261 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1262 if ((ie
[i
+ 2] & 0x7f) > rate
)
1263 rate
= ie
[i
+ 2] & 0x7f;
1266 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1267 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1268 if ((ie
[i
+ 2] & 0x7f) > rate
)
1269 rate
= ie
[i
+ 2] & 0x7f;
1277 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1278 * @res: Scan result entry
1279 * @ie: Information element identitifier (WLAN_EID_*)
1280 * Returns: Pointer to the information element (id field) or %NULL if not found
1282 * This function returns the first matching information element in the scan
1285 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1287 const u8
*end
, *pos
;
1289 pos
= (const u8
*) (res
+ 1);
1290 end
= pos
+ res
->ie_len
;
1292 while (pos
+ 1 < end
) {
1293 if (pos
+ 2 + pos
[1] > end
)
1305 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1306 * @res: Scan result entry
1307 * @vendor_type: Vendor type (four octets starting the IE payload)
1308 * Returns: Pointer to the information element (id field) or %NULL if not found
1310 * This function returns the first matching information element in the scan
1313 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1316 const u8
*end
, *pos
;
1318 pos
= (const u8
*) (res
+ 1);
1319 end
= pos
+ res
->ie_len
;
1321 while (pos
+ 1 < end
) {
1322 if (pos
+ 2 + pos
[1] > end
)
1324 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1325 vendor_type
== WPA_GET_BE32(&pos
[2]))
1335 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1336 * @res: Scan result entry
1337 * @vendor_type: Vendor type (four octets starting the IE payload)
1338 * Returns: Pointer to the information element (id field) or %NULL if not found
1340 * This function returns the first matching information element in the scan
1343 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1344 * from Beacon frames instead of either Beacon or Probe Response frames.
1346 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1349 const u8
*end
, *pos
;
1351 if (res
->beacon_ie_len
== 0)
1354 pos
= (const u8
*) (res
+ 1);
1356 end
= pos
+ res
->beacon_ie_len
;
1358 while (pos
+ 1 < end
) {
1359 if (pos
+ 2 + pos
[1] > end
)
1361 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1362 vendor_type
== WPA_GET_BE32(&pos
[2]))
1372 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1373 * @res: Scan result entry
1374 * @vendor_type: Vendor type (four octets starting the IE payload)
1375 * Returns: Pointer to the information element payload or %NULL if not found
1377 * This function returns concatenated payload of possibly fragmented vendor
1378 * specific information elements in the scan result. The caller is responsible
1379 * for freeing the returned buffer.
1381 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1385 const u8
*end
, *pos
;
1387 buf
= wpabuf_alloc(res
->ie_len
);
1391 pos
= (const u8
*) (res
+ 1);
1392 end
= pos
+ res
->ie_len
;
1394 while (pos
+ 1 < end
) {
1395 if (pos
+ 2 + pos
[1] > end
)
1397 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1398 vendor_type
== WPA_GET_BE32(&pos
[2]))
1399 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1403 if (wpabuf_len(buf
) == 0) {
1413 * Channels with a great SNR can operate at full rate. What is a great SNR?
1414 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1415 * rule of thumb is that any SNR above 20 is good." This one
1416 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1417 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1418 * conservative value.
1420 #define GREAT_SNR 30
1422 /* Compare function for sorting scan results. Return >0 if @b is considered
1424 static int wpa_scan_result_compar(const void *a
, const void *b
)
1426 #define IS_5GHZ(n) (n > 4000)
1427 #define MIN(a,b) a < b ? a : b
1428 struct wpa_scan_res
**_wa
= (void *) a
;
1429 struct wpa_scan_res
**_wb
= (void *) b
;
1430 struct wpa_scan_res
*wa
= *_wa
;
1431 struct wpa_scan_res
*wb
= *_wb
;
1432 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1435 /* WPA/WPA2 support preferred */
1436 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1437 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1438 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1439 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1441 if (wpa_b
&& !wpa_a
)
1443 if (!wpa_b
&& wpa_a
)
1446 /* privacy support preferred */
1447 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1448 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1450 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1451 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1454 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1455 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1456 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1457 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1459 /* Not suitable information to calculate SNR, so use level */
1464 /* best/max rate preferred if SNR close enough */
1465 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1466 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1467 maxrate_a
= wpa_scan_get_max_rate(wa
);
1468 maxrate_b
= wpa_scan_get_max_rate(wb
);
1469 if (maxrate_a
!= maxrate_b
)
1470 return maxrate_b
- maxrate_a
;
1471 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1472 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1475 /* use freq for channel preference */
1477 /* all things being equal, use SNR; if SNRs are
1478 * identical, use quality values since some drivers may only report
1479 * that value and leave the signal level zero */
1481 return wb
->qual
- wa
->qual
;
1482 return snr_b
- snr_a
;
1489 /* Compare function for sorting scan results when searching a WPS AP for
1490 * provisioning. Return >0 if @b is considered better. */
1491 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1493 struct wpa_scan_res
**_wa
= (void *) a
;
1494 struct wpa_scan_res
**_wb
= (void *) b
;
1495 struct wpa_scan_res
*wa
= *_wa
;
1496 struct wpa_scan_res
*wb
= *_wb
;
1497 int uses_wps_a
, uses_wps_b
;
1498 struct wpabuf
*wps_a
, *wps_b
;
1501 /* Optimization - check WPS IE existence before allocated memory and
1502 * doing full reassembly. */
1503 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1504 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1505 if (uses_wps_a
&& !uses_wps_b
)
1507 if (!uses_wps_a
&& uses_wps_b
)
1510 if (uses_wps_a
&& uses_wps_b
) {
1511 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1512 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1513 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1521 * Do not use current AP security policy as a sorting criteria during
1522 * WPS provisioning step since the AP may get reconfigured at the
1523 * completion of provisioning.
1526 /* all things being equal, use signal level; if signal levels are
1527 * identical, use quality values since some drivers may only report
1528 * that value and leave the signal level zero */
1529 if (wb
->level
== wa
->level
)
1530 return wb
->qual
- wa
->qual
;
1531 return wb
->level
- wa
->level
;
1533 #endif /* CONFIG_WPS */
1536 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1538 #ifndef CONFIG_NO_STDOUT_DEBUG
1541 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1544 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1546 for (i
= 0; i
< scan_res
->num
; i
++) {
1547 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1549 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1550 == WPA_SCAN_LEVEL_DBM
) {
1551 int snr
= r
->level
- r
->noise
;
1552 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1553 "noise=%d level=%d snr=%d%s flags=0x%x "
1555 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1556 r
->noise
, r
->level
, snr
,
1557 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1560 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1561 "noise=%d level=%d flags=0x%x age=%u",
1562 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1563 r
->noise
, r
->level
, r
->flags
, r
->age
);
1565 pos
= (u8
*) (r
+ 1);
1567 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1569 if (r
->beacon_ie_len
)
1570 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1571 pos
, r
->beacon_ie_len
);
1573 #endif /* CONFIG_NO_STDOUT_DEBUG */
1578 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1579 * @wpa_s: Pointer to wpa_supplicant data
1580 * @bssid: BSSID to check
1581 * Returns: 0 if the BSSID is filtered or 1 if not
1583 * This function is used to filter out specific BSSIDs from scan reslts mainly
1584 * for testing purposes (SET bssid_filter ctrl_iface command).
1586 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1591 if (wpa_s
->bssid_filter
== NULL
)
1594 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1595 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1604 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1605 struct wpa_scan_results
*res
)
1609 if (wpa_s
->bssid_filter
== NULL
)
1612 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1613 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1614 res
->res
[i
]->bssid
)) {
1615 res
->res
[j
++] = res
->res
[i
];
1617 os_free(res
->res
[i
]);
1622 if (res
->num
!= j
) {
1623 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1624 (int) (res
->num
- j
));
1631 * wpa_supplicant_get_scan_results - Get scan results
1632 * @wpa_s: Pointer to wpa_supplicant data
1633 * @info: Information about what was scanned or %NULL if not available
1634 * @new_scan: Whether a new scan was performed
1635 * Returns: Scan results, %NULL on failure
1637 * This function request the current scan results from the driver and updates
1638 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1639 * results with wpa_scan_results_free().
1641 struct wpa_scan_results
*
1642 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1643 struct scan_info
*info
, int new_scan
)
1645 struct wpa_scan_results
*scan_res
;
1647 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1649 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1650 if (scan_res
== NULL
) {
1651 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1654 if (scan_res
->fetch_time
.sec
== 0) {
1656 * Make sure we have a valid timestamp if the driver wrapper
1657 * does not set this.
1659 os_get_time(&scan_res
->fetch_time
);
1661 filter_scan_res(wpa_s
, scan_res
);
1664 if (wpas_wps_in_progress(wpa_s
)) {
1665 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1666 "provisioning rules");
1667 compar
= wpa_scan_result_wps_compar
;
1669 #endif /* CONFIG_WPS */
1671 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1673 dump_scan_res(scan_res
);
1675 wpa_bss_update_start(wpa_s
);
1676 for (i
= 0; i
< scan_res
->num
; i
++)
1677 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1678 &scan_res
->fetch_time
);
1679 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1686 * wpa_supplicant_update_scan_results - Update scan results from the driver
1687 * @wpa_s: Pointer to wpa_supplicant data
1688 * Returns: 0 on success, -1 on failure
1690 * This function updates the BSS table within wpa_supplicant based on the
1691 * currently available scan results from the driver without requesting a new
1692 * scan. This is used in cases where the driver indicates an association
1693 * (including roaming within ESS) and wpa_supplicant does not yet have the
1694 * needed information to complete the connection (e.g., to perform validation
1695 * steps in 4-way handshake).
1697 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1699 struct wpa_scan_results
*scan_res
;
1700 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1701 if (scan_res
== NULL
)
1703 wpa_scan_results_free(scan_res
);
1710 * scan_only_handler - Reports scan results
1712 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1713 struct wpa_scan_results
*scan_res
)
1715 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1716 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1717 wpas_notify_scan_results(wpa_s
);
1718 wpas_notify_scan_done(wpa_s
, 1);
1722 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1724 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);