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"
24 #include "gas_query.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
);
146 * wpa_supplicant_trigger_scan - Request driver to start a scan
147 * @wpa_s: Pointer to wpa_supplicant data
148 * @params: Scan parameters
149 * Returns: 0 on success, -1 on failure
151 int wpa_supplicant_trigger_scan(struct wpa_supplicant
*wpa_s
,
152 struct wpa_driver_scan_params
*params
)
156 wpa_supplicant_notify_scanning(wpa_s
, 1);
158 ret
= wpa_drv_scan(wpa_s
, params
);
160 wpa_supplicant_notify_scanning(wpa_s
, 0);
161 wpas_notify_scan_done(wpa_s
, 0);
163 os_get_reltime(&wpa_s
->scan_trigger_time
);
165 wpa_s
->normal_scans
++;
166 wpa_s
->own_scan_requested
= 1;
174 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
176 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
178 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting delayed sched scan");
180 if (wpa_supplicant_req_sched_scan(wpa_s
))
181 wpa_supplicant_req_scan(wpa_s
, 0, 0);
186 wpa_supplicant_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
188 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
190 wpa_dbg(wpa_s
, MSG_DEBUG
, "Sched scan timeout - stopping it");
192 wpa_s
->sched_scan_timed_out
= 1;
193 wpa_supplicant_cancel_sched_scan(wpa_s
);
197 int wpa_supplicant_start_sched_scan(struct wpa_supplicant
*wpa_s
,
198 struct wpa_driver_scan_params
*params
,
203 wpa_supplicant_notify_scanning(wpa_s
, 1);
204 ret
= wpa_drv_sched_scan(wpa_s
, params
, interval
* 1000);
206 wpa_supplicant_notify_scanning(wpa_s
, 0);
208 wpa_s
->sched_scanning
= 1;
214 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant
*wpa_s
)
218 ret
= wpa_drv_stop_sched_scan(wpa_s
);
220 wpa_dbg(wpa_s
, MSG_DEBUG
, "stopping sched_scan failed!");
221 /* TODO: what to do if stopping fails? */
229 static struct wpa_driver_scan_filter
*
230 wpa_supplicant_build_filter_ssids(struct wpa_config
*conf
, size_t *num_ssids
)
232 struct wpa_driver_scan_filter
*ssids
;
233 struct wpa_ssid
*ssid
;
237 if (!conf
->filter_ssids
)
240 for (count
= 0, ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
241 if (ssid
->ssid
&& ssid
->ssid_len
)
246 ssids
= os_zalloc(count
* sizeof(struct wpa_driver_scan_filter
));
250 for (ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
251 if (!ssid
->ssid
|| !ssid
->ssid_len
)
253 os_memcpy(ssids
[*num_ssids
].ssid
, ssid
->ssid
, ssid
->ssid_len
);
254 ssids
[*num_ssids
].ssid_len
= ssid
->ssid_len
;
262 static void wpa_supplicant_optimize_freqs(
263 struct wpa_supplicant
*wpa_s
, struct wpa_driver_scan_params
*params
)
266 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_provisioning
&&
268 /* Optimize provisioning state scan based on GO information */
269 if (wpa_s
->p2p_in_provisioning
< 5 &&
270 wpa_s
->go_params
->freq
> 0) {
271 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO "
272 "preferred frequency %d MHz",
273 wpa_s
->go_params
->freq
);
274 params
->freqs
= os_zalloc(2 * sizeof(int));
276 params
->freqs
[0] = wpa_s
->go_params
->freq
;
277 } else if (wpa_s
->p2p_in_provisioning
< 8 &&
278 wpa_s
->go_params
->freq_list
[0]) {
279 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only common "
281 int_array_concat(¶ms
->freqs
,
282 wpa_s
->go_params
->freq_list
);
284 int_array_sort_unique(params
->freqs
);
286 wpa_s
->p2p_in_provisioning
++;
288 #endif /* CONFIG_P2P */
291 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
293 * Optimize post-provisioning scan based on channel used
294 * during provisioning.
296 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
297 "that was used during provisioning", wpa_s
->wps_freq
);
298 params
->freqs
= os_zalloc(2 * sizeof(int));
300 params
->freqs
[0] = wpa_s
->wps_freq
;
304 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
306 /* Optimize provisioning scan based on already known channel */
307 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
309 params
->freqs
= os_zalloc(2 * sizeof(int));
311 params
->freqs
[0] = wpa_s
->wps_freq
;
312 wpa_s
->known_wps_freq
= 0; /* only do this once */
314 #endif /* CONFIG_WPS */
318 #ifdef CONFIG_INTERWORKING
319 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
322 if (wpa_s
->conf
->interworking
== 0)
325 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
326 wpabuf_put_u8(buf
, 4);
327 wpabuf_put_u8(buf
, 0x00);
328 wpabuf_put_u8(buf
, 0x00);
329 wpabuf_put_u8(buf
, 0x00);
330 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
332 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
333 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
335 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
337 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
338 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
340 #endif /* CONFIG_INTERWORKING */
343 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
345 struct wpabuf
*extra_ie
= NULL
;
348 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
349 #endif /* CONFIG_WPS */
351 #ifdef CONFIG_INTERWORKING
352 if (wpa_s
->conf
->interworking
&&
353 wpabuf_resize(&extra_ie
, 100) == 0)
354 wpas_add_interworking_elements(wpa_s
, extra_ie
);
355 #endif /* CONFIG_INTERWORKING */
358 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
361 struct wpabuf
*wps_ie
;
362 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
365 wpa_s
->wps
->uuid
, req_type
,
368 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
369 wpabuf_put_buf(extra_ie
, wps_ie
);
376 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
377 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
378 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
380 #endif /* CONFIG_P2P */
382 #endif /* CONFIG_WPS */
385 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
386 wpas_hs20_add_indication(extra_ie
);
387 #endif /* CONFIG_HS20 */
396 * Check whether there are any enabled networks or credentials that could be
397 * used for a non-P2P connection.
399 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
401 struct wpa_ssid
*ssid
;
403 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
404 if (wpas_network_disabled(wpa_s
, ssid
))
406 if (!ssid
->p2p_group
)
410 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
411 wpa_s
->conf
->auto_interworking
)
417 #endif /* CONFIG_P2P */
420 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
422 enum hostapd_hw_mode mode
)
426 for (i
= 0; i
< num_modes
; i
++) {
427 if (modes
[i
].mode
== mode
)
435 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
436 enum hostapd_hw_mode band
,
437 struct wpa_driver_scan_params
*params
)
439 /* Include only supported channels for the specified band */
440 struct hostapd_hw_modes
*mode
;
443 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
445 /* No channels supported in this band - use empty list */
446 params
->freqs
= os_zalloc(sizeof(int));
450 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
451 if (params
->freqs
== NULL
)
453 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
454 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
456 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
461 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
462 struct wpa_driver_scan_params
*params
)
464 if (wpa_s
->hw
.modes
== NULL
)
465 return; /* unknown what channels the driver supports */
467 return; /* already using a limited channel set */
468 if (wpa_s
->setband
== WPA_SETBAND_5G
)
469 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
471 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
472 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
477 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
479 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
480 struct wpa_ssid
*ssid
;
482 struct wpabuf
*extra_ie
= NULL
;
483 struct wpa_driver_scan_params params
;
484 struct wpa_driver_scan_params
*scan_params
;
486 enum wpa_states prev_state
;
488 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
489 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
490 wpas_p2p_continue_after_scan(wpa_s
);
494 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
495 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
496 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
497 wpas_p2p_continue_after_scan(wpa_s
);
501 if (wpa_s
->scanning
) {
503 * If we are already in scanning state, we shall reschedule the
504 * the incoming scan request.
506 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
507 wpa_supplicant_req_scan(wpa_s
, 1, 0);
511 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
512 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
513 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
514 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
515 wpas_p2p_continue_after_scan(wpa_s
);
519 if (wpa_s
->conf
->ap_scan
!= 0 &&
520 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
521 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
522 "overriding ap_scan configuration");
523 wpa_s
->conf
->ap_scan
= 0;
524 wpas_notify_ap_scan_changed(wpa_s
);
527 if (wpa_s
->conf
->ap_scan
== 0) {
528 wpa_supplicant_gen_assoc_event(wpa_s
);
533 if (wpas_p2p_in_progress(wpa_s
) || wpas_wpa_is_in_progress(wpa_s
, 0)) {
534 if (wpa_s
->sta_scan_pending
&&
535 wpas_p2p_in_progress(wpa_s
) == 2 &&
536 wpa_s
->global
->p2p_cb_on_scan_complete
) {
537 wpa_dbg(wpa_s
, MSG_DEBUG
, "Process pending station "
538 "mode scan during P2P search");
540 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan "
541 "while P2P operation is in progress");
542 wpa_s
->sta_scan_pending
= 1;
543 wpa_supplicant_req_scan(wpa_s
, 5, 0);
547 #endif /* CONFIG_P2P */
550 if (gas_query_in_progress(wpa_s
->gas
)) {
551 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay scan while GAS query is in progress");
552 wpa_supplicant_req_scan(wpa_s
, 1, 0);
555 #endif /* CONFIG_GAS */
557 if (wpa_s
->conf
->ap_scan
== 2)
560 max_ssids
= wpa_s
->max_scan_ssids
;
561 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
562 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
565 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
566 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
568 os_memset(¶ms
, 0, sizeof(params
));
570 prev_state
= wpa_s
->wpa_state
;
571 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
572 wpa_s
->wpa_state
== WPA_INACTIVE
)
573 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
576 * If autoscan has set its own scanning parameters
578 if (wpa_s
->autoscan_params
!= NULL
) {
579 scan_params
= wpa_s
->autoscan_params
;
583 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
584 wpa_s
->connect_without_scan
) {
585 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
586 if (ssid
== wpa_s
->connect_without_scan
)
589 wpa_s
->connect_without_scan
= NULL
;
591 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
592 "without scan step");
593 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
599 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
601 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
602 wpa_s
->p2p_in_provisioning
,
603 wpa_s
->show_group_started
);
604 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
605 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
606 params
.num_ssids
= 1;
609 #endif /* CONFIG_P2P */
611 /* Find the starting point from which to continue scanning */
612 ssid
= wpa_s
->conf
->ssid
;
613 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
615 if (ssid
== wpa_s
->prev_scan_ssid
) {
623 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
624 wpa_s
->conf
->ap_scan
== 2) {
625 wpa_s
->connect_without_scan
= NULL
;
626 wpa_s
->prev_scan_wildcard
= 0;
627 wpa_supplicant_assoc_try(wpa_s
, ssid
);
629 } else if (wpa_s
->conf
->ap_scan
== 2) {
631 * User-initiated scan request in ap_scan == 2; scan with
636 struct wpa_ssid
*start
= ssid
, *tssid
;
638 if (ssid
== NULL
&& max_ssids
> 1)
639 ssid
= wpa_s
->conf
->ssid
;
641 if (!wpas_network_disabled(wpa_s
, ssid
) &&
643 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
644 ssid
->ssid
, ssid
->ssid_len
);
645 params
.ssids
[params
.num_ssids
].ssid
=
647 params
.ssids
[params
.num_ssids
].ssid_len
=
650 if (params
.num_ssids
+ 1 >= max_ssids
)
656 if (ssid
== NULL
&& max_ssids
> 1 &&
657 start
!= wpa_s
->conf
->ssid
)
658 ssid
= wpa_s
->conf
->ssid
;
661 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
662 if (wpas_network_disabled(wpa_s
, tssid
))
664 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
665 int_array_concat(¶ms
.freqs
,
668 os_free(params
.freqs
);
673 int_array_sort_unique(params
.freqs
);
676 if (ssid
&& max_ssids
== 1) {
678 * If the driver is limited to 1 SSID at a time interleave
679 * wildcard SSID scans with specific SSID scans to avoid
680 * waiting a long time for a wildcard scan.
682 if (!wpa_s
->prev_scan_wildcard
) {
683 params
.ssids
[0].ssid
= NULL
;
684 params
.ssids
[0].ssid_len
= 0;
685 wpa_s
->prev_scan_wildcard
= 1;
686 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
687 "wildcard SSID (Interleave with specific)");
689 wpa_s
->prev_scan_ssid
= ssid
;
690 wpa_s
->prev_scan_wildcard
= 0;
691 wpa_dbg(wpa_s
, MSG_DEBUG
,
692 "Starting AP scan for specific SSID: %s",
693 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
698 wpa_s
->prev_scan_ssid
= ssid
;
699 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
702 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
703 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
704 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
706 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
708 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
713 #endif /* CONFIG_P2P */
715 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
716 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
718 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
719 wpa_s
->manual_scan_freqs
) {
720 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
721 params
.freqs
= wpa_s
->manual_scan_freqs
;
722 wpa_s
->manual_scan_freqs
= NULL
;
725 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
726 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
727 "generated frequency list");
728 params
.freqs
= wpa_s
->next_scan_freqs
;
730 os_free(wpa_s
->next_scan_freqs
);
731 wpa_s
->next_scan_freqs
= NULL
;
732 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
734 /* See if user specified frequencies. If so, scan only those. */
735 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
736 wpa_dbg(wpa_s
, MSG_DEBUG
,
737 "Optimize scan based on conf->freq_list");
738 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
741 /* Use current associated channel? */
742 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
743 unsigned int num
= wpa_s
->num_multichan_concurrent
;
745 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
747 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
749 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
750 "current operating channels since "
751 "scan_cur_freq is enabled");
753 os_free(params
.freqs
);
759 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
760 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
762 params
.extra_ies
= wpabuf_head(extra_ie
);
763 params
.extra_ies_len
= wpabuf_len(extra_ie
);
767 if (wpa_s
->p2p_in_provisioning
||
768 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
770 * The interface may not yet be in P2P mode, so we have to
771 * explicitly request P2P probe to disable CCK rates.
773 params
.p2p_probe
= 1;
775 #endif /* CONFIG_P2P */
777 scan_params
= ¶ms
;
782 * If the driver does not support multi-channel concurrency and a
783 * virtual interface that shares the same radio with the wpa_s interface
784 * is operating there may not be need to scan other channels apart from
785 * the current operating channel on the other virtual interface. Filter
786 * out other channels in case we are trying to find a connection for a
787 * station interface when we are not configured to prefer station
788 * connection and a concurrent operation is already in process.
790 if (wpa_s
->scan_for_connection
&&
791 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
792 !scan_params
->freqs
&& !params
.freqs
&&
793 wpas_is_p2p_prioritized(wpa_s
) &&
794 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
795 non_p2p_network_enabled(wpa_s
)) {
796 unsigned int num
= wpa_s
->num_multichan_concurrent
;
798 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
800 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
801 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
802 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
804 os_free(params
.freqs
);
809 #endif /* CONFIG_P2P */
811 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
813 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
814 !wpa_s
->manual_scan_freqs
) {
815 /* Restore manual_scan_freqs for the next attempt */
816 wpa_s
->manual_scan_freqs
= params
.freqs
;
820 wpabuf_free(extra_ie
);
821 os_free(params
.freqs
);
822 os_free(params
.filter_ssids
);
825 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
826 if (prev_state
!= wpa_s
->wpa_state
)
827 wpa_supplicant_set_state(wpa_s
, prev_state
);
828 /* Restore scan_req since we will try to scan again */
829 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
830 wpa_supplicant_req_scan(wpa_s
, 1, 0);
832 wpa_s
->scan_for_connection
= 0;
837 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
839 struct os_reltime remaining
, new_int
;
842 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
847 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
848 new_int
.sec
= remaining
.sec
;
849 new_int
.usec
= remaining
.usec
;
853 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
854 wpa_supplicant_scan
, wpa_s
, NULL
);
856 wpa_s
->scan_interval
= sec
;
861 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
862 * @wpa_s: Pointer to wpa_supplicant data
863 * @sec: Number of seconds after which to scan
864 * @usec: Number of microseconds after which to scan
866 * This function is used to schedule a scan for neighboring access points after
867 * the specified time.
869 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
871 if (eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
))
873 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d sec %d usec",
878 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d sec %d usec",
880 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
881 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
886 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
887 * @wpa_s: Pointer to wpa_supplicant data
888 * @sec: Number of seconds after which to scan
889 * @usec: Number of microseconds after which to scan
890 * Returns: 0 on success or -1 otherwise
892 * This function is used to schedule periodic scans for neighboring
893 * access points after the specified time.
895 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
898 if (!wpa_s
->sched_scan_supported
)
901 eloop_register_timeout(sec
, usec
,
902 wpa_supplicant_delayed_sched_scan_timeout
,
910 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
911 * @wpa_s: Pointer to wpa_supplicant data
912 * Returns: 0 is sched_scan was started or -1 otherwise
914 * This function is used to schedule periodic scans for neighboring
915 * access points repeating the scan continuously.
917 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
919 struct wpa_driver_scan_params params
;
920 struct wpa_driver_scan_params
*scan_params
;
921 enum wpa_states prev_state
;
922 struct wpa_ssid
*ssid
= NULL
;
923 struct wpabuf
*extra_ie
= NULL
;
925 unsigned int max_sched_scan_ssids
;
929 if (!wpa_s
->sched_scan_supported
)
932 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
933 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
935 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
936 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
939 if (wpa_s
->sched_scanning
) {
940 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
945 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
946 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
947 /* Use wildcard SSID to find this network */
949 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
954 if (!wpas_network_disabled(wpa_s
, ssid
) &&
955 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
957 * Normal scan is more reliable and faster for WPS
958 * operations and since these are for short periods of
959 * time, the benefit of trying to use sched_scan would
962 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
963 "sched_scan for WPS");
966 #endif /* CONFIG_WPS */
971 if (wpa_s
->normal_scans
< 3 &&
972 (need_ssids
<= wpa_s
->max_scan_ssids
||
973 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
975 * When normal scan can speed up operations, use that for the
976 * first operations before starting the sched_scan to allow
977 * user space sleep more. We do this only if the normal scan
978 * has functionality that is suitable for this or if the
979 * sched_scan does not have better support for multiple SSIDs.
981 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
982 "sched_scan for initial scans (normal_scans=%d)",
983 wpa_s
->normal_scans
);
987 os_memset(¶ms
, 0, sizeof(params
));
989 /* If we can't allocate space for the filters, we just don't filter */
990 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
991 sizeof(struct wpa_driver_scan_filter
));
993 prev_state
= wpa_s
->wpa_state
;
994 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
995 wpa_s
->wpa_state
== WPA_INACTIVE
)
996 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
998 if (wpa_s
->autoscan_params
!= NULL
) {
999 scan_params
= wpa_s
->autoscan_params
;
1003 /* Find the starting point from which to continue scanning */
1004 ssid
= wpa_s
->conf
->ssid
;
1005 if (wpa_s
->prev_sched_ssid
) {
1007 if (ssid
== wpa_s
->prev_sched_ssid
) {
1015 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1016 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1017 if (wpa_s
->conf
->sched_scan_interval
)
1018 wpa_s
->sched_scan_interval
=
1019 wpa_s
->conf
->sched_scan_interval
;
1020 if (wpa_s
->sched_scan_interval
== 0)
1021 wpa_s
->sched_scan_interval
= 10;
1022 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1023 wpa_s
->first_sched_scan
= 1;
1024 ssid
= wpa_s
->conf
->ssid
;
1025 wpa_s
->prev_sched_ssid
= ssid
;
1029 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1034 if (wpas_network_disabled(wpa_s
, ssid
))
1037 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1038 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1039 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1040 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1041 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1042 ssid
->ssid
, ssid
->ssid_len
);
1043 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1045 params
.num_filter_ssids
++;
1046 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1048 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1049 "filter for sched_scan - drop filter");
1050 os_free(params
.filter_ssids
);
1051 params
.filter_ssids
= NULL
;
1052 params
.num_filter_ssids
= 0;
1055 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1056 if (params
.num_ssids
== max_sched_scan_ssids
)
1057 break; /* only room for broadcast SSID */
1058 wpa_dbg(wpa_s
, MSG_DEBUG
,
1059 "add to active scan ssid: %s",
1060 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1061 params
.ssids
[params
.num_ssids
].ssid
=
1063 params
.ssids
[params
.num_ssids
].ssid_len
=
1066 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1067 wpa_s
->prev_sched_ssid
= ssid
;
1071 (wpas_network_disabled(wpa_s
, ssid
) ||
1078 wpa_s
->prev_sched_ssid
= ssid
;
1082 if (params
.num_filter_ssids
== 0) {
1083 os_free(params
.filter_ssids
);
1084 params
.filter_ssids
= NULL
;
1087 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1089 params
.extra_ies
= wpabuf_head(extra_ie
);
1090 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1093 scan_params
= ¶ms
;
1096 if (ssid
|| !wpa_s
->first_sched_scan
) {
1097 wpa_dbg(wpa_s
, MSG_DEBUG
,
1098 "Starting sched scan: interval %d timeout %d",
1099 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1101 wpa_dbg(wpa_s
, MSG_DEBUG
,
1102 "Starting sched scan: interval %d (no timeout)",
1103 wpa_s
->sched_scan_interval
);
1106 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1108 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1109 wpa_s
->sched_scan_interval
);
1110 wpabuf_free(extra_ie
);
1111 os_free(params
.filter_ssids
);
1113 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1114 if (prev_state
!= wpa_s
->wpa_state
)
1115 wpa_supplicant_set_state(wpa_s
, prev_state
);
1119 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1120 if (ssid
|| !wpa_s
->first_sched_scan
) {
1121 wpa_s
->sched_scan_timed_out
= 0;
1122 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1123 wpa_supplicant_sched_scan_timeout
,
1125 wpa_s
->first_sched_scan
= 0;
1126 wpa_s
->sched_scan_timeout
/= 2;
1127 wpa_s
->sched_scan_interval
*= 2;
1128 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1129 wpa_s
->sched_scan_interval
= 10;
1130 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1134 /* If there is no more ssids, start next time from the beginning */
1136 wpa_s
->prev_sched_ssid
= NULL
;
1143 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1144 * @wpa_s: Pointer to wpa_supplicant data
1146 * This function is used to cancel a scan request scheduled with
1147 * wpa_supplicant_req_scan().
1149 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1151 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1152 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1153 wpas_p2p_continue_after_scan(wpa_s
);
1158 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1159 * @wpa_s: Pointer to wpa_supplicant data
1161 * This function is used to stop a delayed scheduled scan.
1163 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1165 if (!wpa_s
->sched_scan_supported
)
1168 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1169 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1175 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1176 * @wpa_s: Pointer to wpa_supplicant data
1178 * This function is used to stop a periodic scheduled scan.
1180 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1182 if (!wpa_s
->sched_scanning
)
1185 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1186 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1187 wpa_supplicant_stop_sched_scan(wpa_s
);
1192 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1193 * @wpa_s: Pointer to wpa_supplicant data
1194 * @scanning: Whether scanning is currently in progress
1196 * This function is to generate scanning notifycations. It is called whenever
1197 * there may have been a change in scanning (scan started, completed, stopped).
1198 * wpas_notify_scanning() is called whenever the scanning state changed from the
1199 * previously notified state.
1201 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1204 if (wpa_s
->scanning
!= scanning
) {
1205 wpa_s
->scanning
= scanning
;
1206 wpas_notify_scanning(wpa_s
);
1211 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1217 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1218 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1219 if ((ie
[i
+ 2] & 0x7f) > rate
)
1220 rate
= ie
[i
+ 2] & 0x7f;
1223 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1224 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1225 if ((ie
[i
+ 2] & 0x7f) > rate
)
1226 rate
= ie
[i
+ 2] & 0x7f;
1234 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1235 * @res: Scan result entry
1236 * @ie: Information element identitifier (WLAN_EID_*)
1237 * Returns: Pointer to the information element (id field) or %NULL if not found
1239 * This function returns the first matching information element in the scan
1242 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1244 const u8
*end
, *pos
;
1246 pos
= (const u8
*) (res
+ 1);
1247 end
= pos
+ res
->ie_len
;
1249 while (pos
+ 1 < end
) {
1250 if (pos
+ 2 + pos
[1] > end
)
1262 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1263 * @res: Scan result entry
1264 * @vendor_type: Vendor type (four octets starting the IE payload)
1265 * Returns: Pointer to the information element (id field) or %NULL if not found
1267 * This function returns the first matching information element in the scan
1270 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1273 const u8
*end
, *pos
;
1275 pos
= (const u8
*) (res
+ 1);
1276 end
= pos
+ res
->ie_len
;
1278 while (pos
+ 1 < end
) {
1279 if (pos
+ 2 + pos
[1] > end
)
1281 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1282 vendor_type
== WPA_GET_BE32(&pos
[2]))
1292 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1293 * @res: Scan result entry
1294 * @vendor_type: Vendor type (four octets starting the IE payload)
1295 * Returns: Pointer to the information element (id field) or %NULL if not found
1297 * This function returns the first matching information element in the scan
1300 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1301 * from Beacon frames instead of either Beacon or Probe Response frames.
1303 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1306 const u8
*end
, *pos
;
1308 if (res
->beacon_ie_len
== 0)
1311 pos
= (const u8
*) (res
+ 1);
1313 end
= pos
+ res
->beacon_ie_len
;
1315 while (pos
+ 1 < end
) {
1316 if (pos
+ 2 + pos
[1] > end
)
1318 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1319 vendor_type
== WPA_GET_BE32(&pos
[2]))
1329 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1330 * @res: Scan result entry
1331 * @vendor_type: Vendor type (four octets starting the IE payload)
1332 * Returns: Pointer to the information element payload or %NULL if not found
1334 * This function returns concatenated payload of possibly fragmented vendor
1335 * specific information elements in the scan result. The caller is responsible
1336 * for freeing the returned buffer.
1338 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1342 const u8
*end
, *pos
;
1344 buf
= wpabuf_alloc(res
->ie_len
);
1348 pos
= (const u8
*) (res
+ 1);
1349 end
= pos
+ res
->ie_len
;
1351 while (pos
+ 1 < end
) {
1352 if (pos
+ 2 + pos
[1] > end
)
1354 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1355 vendor_type
== WPA_GET_BE32(&pos
[2]))
1356 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1360 if (wpabuf_len(buf
) == 0) {
1370 * Channels with a great SNR can operate at full rate. What is a great SNR?
1371 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1372 * rule of thumb is that any SNR above 20 is good." This one
1373 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1374 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1375 * conservative value.
1377 #define GREAT_SNR 30
1379 /* Compare function for sorting scan results. Return >0 if @b is considered
1381 static int wpa_scan_result_compar(const void *a
, const void *b
)
1383 #define IS_5GHZ(n) (n > 4000)
1384 #define MIN(a,b) a < b ? a : b
1385 struct wpa_scan_res
**_wa
= (void *) a
;
1386 struct wpa_scan_res
**_wb
= (void *) b
;
1387 struct wpa_scan_res
*wa
= *_wa
;
1388 struct wpa_scan_res
*wb
= *_wb
;
1389 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1392 /* WPA/WPA2 support preferred */
1393 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1394 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1395 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1396 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1398 if (wpa_b
&& !wpa_a
)
1400 if (!wpa_b
&& wpa_a
)
1403 /* privacy support preferred */
1404 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1405 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1407 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1408 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1411 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1412 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1413 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1414 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1416 /* Not suitable information to calculate SNR, so use level */
1421 /* best/max rate preferred if SNR close enough */
1422 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1423 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1424 maxrate_a
= wpa_scan_get_max_rate(wa
);
1425 maxrate_b
= wpa_scan_get_max_rate(wb
);
1426 if (maxrate_a
!= maxrate_b
)
1427 return maxrate_b
- maxrate_a
;
1428 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1429 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1432 /* use freq for channel preference */
1434 /* all things being equal, use SNR; if SNRs are
1435 * identical, use quality values since some drivers may only report
1436 * that value and leave the signal level zero */
1438 return wb
->qual
- wa
->qual
;
1439 return snr_b
- snr_a
;
1446 /* Compare function for sorting scan results when searching a WPS AP for
1447 * provisioning. Return >0 if @b is considered better. */
1448 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1450 struct wpa_scan_res
**_wa
= (void *) a
;
1451 struct wpa_scan_res
**_wb
= (void *) b
;
1452 struct wpa_scan_res
*wa
= *_wa
;
1453 struct wpa_scan_res
*wb
= *_wb
;
1454 int uses_wps_a
, uses_wps_b
;
1455 struct wpabuf
*wps_a
, *wps_b
;
1458 /* Optimization - check WPS IE existence before allocated memory and
1459 * doing full reassembly. */
1460 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1461 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1462 if (uses_wps_a
&& !uses_wps_b
)
1464 if (!uses_wps_a
&& uses_wps_b
)
1467 if (uses_wps_a
&& uses_wps_b
) {
1468 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1469 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1470 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1478 * Do not use current AP security policy as a sorting criteria during
1479 * WPS provisioning step since the AP may get reconfigured at the
1480 * completion of provisioning.
1483 /* all things being equal, use signal level; if signal levels are
1484 * identical, use quality values since some drivers may only report
1485 * that value and leave the signal level zero */
1486 if (wb
->level
== wa
->level
)
1487 return wb
->qual
- wa
->qual
;
1488 return wb
->level
- wa
->level
;
1490 #endif /* CONFIG_WPS */
1493 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1495 #ifndef CONFIG_NO_STDOUT_DEBUG
1498 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1501 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1503 for (i
= 0; i
< scan_res
->num
; i
++) {
1504 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1506 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1507 == WPA_SCAN_LEVEL_DBM
) {
1508 int snr
= r
->level
- r
->noise
;
1509 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1510 "noise=%d level=%d snr=%d%s flags=0x%x "
1512 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1513 r
->noise
, r
->level
, snr
,
1514 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1517 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1518 "noise=%d level=%d flags=0x%x age=%u",
1519 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1520 r
->noise
, r
->level
, r
->flags
, r
->age
);
1522 pos
= (u8
*) (r
+ 1);
1524 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1526 if (r
->beacon_ie_len
)
1527 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1528 pos
, r
->beacon_ie_len
);
1530 #endif /* CONFIG_NO_STDOUT_DEBUG */
1535 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1536 * @wpa_s: Pointer to wpa_supplicant data
1537 * @bssid: BSSID to check
1538 * Returns: 0 if the BSSID is filtered or 1 if not
1540 * This function is used to filter out specific BSSIDs from scan reslts mainly
1541 * for testing purposes (SET bssid_filter ctrl_iface command).
1543 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1548 if (wpa_s
->bssid_filter
== NULL
)
1551 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1552 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1561 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1562 struct wpa_scan_results
*res
)
1566 if (wpa_s
->bssid_filter
== NULL
)
1569 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1570 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1571 res
->res
[i
]->bssid
)) {
1572 res
->res
[j
++] = res
->res
[i
];
1574 os_free(res
->res
[i
]);
1579 if (res
->num
!= j
) {
1580 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1581 (int) (res
->num
- j
));
1588 * wpa_supplicant_get_scan_results - Get scan results
1589 * @wpa_s: Pointer to wpa_supplicant data
1590 * @info: Information about what was scanned or %NULL if not available
1591 * @new_scan: Whether a new scan was performed
1592 * Returns: Scan results, %NULL on failure
1594 * This function request the current scan results from the driver and updates
1595 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1596 * results with wpa_scan_results_free().
1598 struct wpa_scan_results
*
1599 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1600 struct scan_info
*info
, int new_scan
)
1602 struct wpa_scan_results
*scan_res
;
1604 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1606 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1607 if (scan_res
== NULL
) {
1608 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1611 if (scan_res
->fetch_time
.sec
== 0) {
1613 * Make sure we have a valid timestamp if the driver wrapper
1614 * does not set this.
1616 os_get_reltime(&scan_res
->fetch_time
);
1618 filter_scan_res(wpa_s
, scan_res
);
1621 if (wpas_wps_in_progress(wpa_s
)) {
1622 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1623 "provisioning rules");
1624 compar
= wpa_scan_result_wps_compar
;
1626 #endif /* CONFIG_WPS */
1628 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1630 dump_scan_res(scan_res
);
1632 wpa_bss_update_start(wpa_s
);
1633 for (i
= 0; i
< scan_res
->num
; i
++)
1634 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1635 &scan_res
->fetch_time
);
1636 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1643 * wpa_supplicant_update_scan_results - Update scan results from the driver
1644 * @wpa_s: Pointer to wpa_supplicant data
1645 * Returns: 0 on success, -1 on failure
1647 * This function updates the BSS table within wpa_supplicant based on the
1648 * currently available scan results from the driver without requesting a new
1649 * scan. This is used in cases where the driver indicates an association
1650 * (including roaming within ESS) and wpa_supplicant does not yet have the
1651 * needed information to complete the connection (e.g., to perform validation
1652 * steps in 4-way handshake).
1654 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1656 struct wpa_scan_results
*scan_res
;
1657 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1658 if (scan_res
== NULL
)
1660 wpa_scan_results_free(scan_res
);
1667 * scan_only_handler - Reports scan results
1669 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1670 struct wpa_scan_results
*scan_res
)
1672 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1673 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1674 wpas_notify_scan_results(wpa_s
);
1675 wpas_notify_scan_done(wpa_s
, 1);
1679 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1681 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);