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 if (wpa_s
->clear_driver_scan_cache
)
159 params
->only_new_results
= 1;
160 ret
= wpa_drv_scan(wpa_s
, params
);
162 wpa_supplicant_notify_scanning(wpa_s
, 0);
163 wpas_notify_scan_done(wpa_s
, 0);
165 os_get_reltime(&wpa_s
->scan_trigger_time
);
167 wpa_s
->normal_scans
++;
168 wpa_s
->own_scan_requested
= 1;
169 wpa_s
->clear_driver_scan_cache
= 0;
177 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
179 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
181 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting delayed sched scan");
183 if (wpa_supplicant_req_sched_scan(wpa_s
))
184 wpa_supplicant_req_scan(wpa_s
, 0, 0);
189 wpa_supplicant_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
191 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
193 wpa_dbg(wpa_s
, MSG_DEBUG
, "Sched scan timeout - stopping it");
195 wpa_s
->sched_scan_timed_out
= 1;
196 wpa_supplicant_cancel_sched_scan(wpa_s
);
200 int wpa_supplicant_start_sched_scan(struct wpa_supplicant
*wpa_s
,
201 struct wpa_driver_scan_params
*params
,
206 wpa_supplicant_notify_scanning(wpa_s
, 1);
207 ret
= wpa_drv_sched_scan(wpa_s
, params
, interval
* 1000);
209 wpa_supplicant_notify_scanning(wpa_s
, 0);
211 wpa_s
->sched_scanning
= 1;
217 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant
*wpa_s
)
221 ret
= wpa_drv_stop_sched_scan(wpa_s
);
223 wpa_dbg(wpa_s
, MSG_DEBUG
, "stopping sched_scan failed!");
224 /* TODO: what to do if stopping fails? */
232 static struct wpa_driver_scan_filter
*
233 wpa_supplicant_build_filter_ssids(struct wpa_config
*conf
, size_t *num_ssids
)
235 struct wpa_driver_scan_filter
*ssids
;
236 struct wpa_ssid
*ssid
;
240 if (!conf
->filter_ssids
)
243 for (count
= 0, ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
244 if (ssid
->ssid
&& ssid
->ssid_len
)
249 ssids
= os_zalloc(count
* sizeof(struct wpa_driver_scan_filter
));
253 for (ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
254 if (!ssid
->ssid
|| !ssid
->ssid_len
)
256 os_memcpy(ssids
[*num_ssids
].ssid
, ssid
->ssid
, ssid
->ssid_len
);
257 ssids
[*num_ssids
].ssid_len
= ssid
->ssid_len
;
265 static void wpa_supplicant_optimize_freqs(
266 struct wpa_supplicant
*wpa_s
, struct wpa_driver_scan_params
*params
)
269 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_provisioning
&&
271 /* Optimize provisioning state scan based on GO information */
272 if (wpa_s
->p2p_in_provisioning
< 5 &&
273 wpa_s
->go_params
->freq
> 0) {
274 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO "
275 "preferred frequency %d MHz",
276 wpa_s
->go_params
->freq
);
277 params
->freqs
= os_zalloc(2 * sizeof(int));
279 params
->freqs
[0] = wpa_s
->go_params
->freq
;
280 } else if (wpa_s
->p2p_in_provisioning
< 8 &&
281 wpa_s
->go_params
->freq_list
[0]) {
282 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only common "
284 int_array_concat(¶ms
->freqs
,
285 wpa_s
->go_params
->freq_list
);
287 int_array_sort_unique(params
->freqs
);
289 wpa_s
->p2p_in_provisioning
++;
291 #endif /* CONFIG_P2P */
294 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
296 * Optimize post-provisioning scan based on channel used
297 * during provisioning.
299 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
300 "that was used during provisioning", wpa_s
->wps_freq
);
301 params
->freqs
= os_zalloc(2 * sizeof(int));
303 params
->freqs
[0] = wpa_s
->wps_freq
;
305 } else if (wpa_s
->after_wps
)
308 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
310 /* Optimize provisioning scan based on already known channel */
311 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
313 params
->freqs
= os_zalloc(2 * sizeof(int));
315 params
->freqs
[0] = wpa_s
->wps_freq
;
316 wpa_s
->known_wps_freq
= 0; /* only do this once */
318 #endif /* CONFIG_WPS */
322 #ifdef CONFIG_INTERWORKING
323 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
326 if (wpa_s
->conf
->interworking
== 0)
329 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
330 wpabuf_put_u8(buf
, 4);
331 wpabuf_put_u8(buf
, 0x00);
332 wpabuf_put_u8(buf
, 0x00);
333 wpabuf_put_u8(buf
, 0x00);
334 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
336 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
337 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
339 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
341 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
342 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
344 #endif /* CONFIG_INTERWORKING */
347 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
349 struct wpabuf
*extra_ie
= NULL
;
352 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
353 #endif /* CONFIG_WPS */
355 #ifdef CONFIG_INTERWORKING
356 if (wpa_s
->conf
->interworking
&&
357 wpabuf_resize(&extra_ie
, 100) == 0)
358 wpas_add_interworking_elements(wpa_s
, extra_ie
);
359 #endif /* CONFIG_INTERWORKING */
362 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
365 struct wpabuf
*wps_ie
;
366 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
369 wpa_s
->wps
->uuid
, req_type
,
372 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
373 wpabuf_put_buf(extra_ie
, wps_ie
);
380 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
381 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
382 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
384 #endif /* CONFIG_P2P */
386 #endif /* CONFIG_WPS */
389 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
390 wpas_hs20_add_indication(extra_ie
);
391 #endif /* CONFIG_HS20 */
400 * Check whether there are any enabled networks or credentials that could be
401 * used for a non-P2P connection.
403 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
405 struct wpa_ssid
*ssid
;
407 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
408 if (wpas_network_disabled(wpa_s
, ssid
))
410 if (!ssid
->p2p_group
)
414 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
415 wpa_s
->conf
->auto_interworking
)
421 #endif /* CONFIG_P2P */
424 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
426 enum hostapd_hw_mode mode
)
430 for (i
= 0; i
< num_modes
; i
++) {
431 if (modes
[i
].mode
== mode
)
439 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
440 enum hostapd_hw_mode band
,
441 struct wpa_driver_scan_params
*params
)
443 /* Include only supported channels for the specified band */
444 struct hostapd_hw_modes
*mode
;
447 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
449 /* No channels supported in this band - use empty list */
450 params
->freqs
= os_zalloc(sizeof(int));
454 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
455 if (params
->freqs
== NULL
)
457 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
458 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
460 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
465 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
466 struct wpa_driver_scan_params
*params
)
468 if (wpa_s
->hw
.modes
== NULL
)
469 return; /* unknown what channels the driver supports */
471 return; /* already using a limited channel set */
472 if (wpa_s
->setband
== WPA_SETBAND_5G
)
473 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
475 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
476 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
481 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
483 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
484 struct wpa_ssid
*ssid
;
486 struct wpabuf
*extra_ie
= NULL
;
487 struct wpa_driver_scan_params params
;
488 struct wpa_driver_scan_params
*scan_params
;
490 enum wpa_states prev_state
;
492 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
493 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
494 wpas_p2p_continue_after_scan(wpa_s
);
498 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
499 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
500 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
501 wpas_p2p_continue_after_scan(wpa_s
);
505 if (wpa_s
->scanning
) {
507 * If we are already in scanning state, we shall reschedule the
508 * the incoming scan request.
510 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
511 wpa_supplicant_req_scan(wpa_s
, 1, 0);
515 if (wpa_s
->external_scan_running
) {
516 struct os_reltime now
, diff
;
517 os_get_reltime(&now
);
518 os_reltime_sub(&now
, &wpa_s
->scan_start_time
, &diff
);
520 wpa_dbg(wpa_s
, MSG_DEBUG
, "Externally triggered scan running - Reschedule the incoming scan req");
521 wpa_supplicant_req_scan(wpa_s
, 1, 0);
526 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
527 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
528 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
529 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
530 wpas_p2p_continue_after_scan(wpa_s
);
534 if (wpa_s
->conf
->ap_scan
!= 0 &&
535 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
536 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
537 "overriding ap_scan configuration");
538 wpa_s
->conf
->ap_scan
= 0;
539 wpas_notify_ap_scan_changed(wpa_s
);
542 if (wpa_s
->conf
->ap_scan
== 0) {
543 wpa_supplicant_gen_assoc_event(wpa_s
);
548 if (wpas_p2p_in_progress(wpa_s
) || wpas_wpa_is_in_progress(wpa_s
, 0)) {
549 if (wpa_s
->sta_scan_pending
&&
550 wpas_p2p_in_progress(wpa_s
) == 2 &&
551 wpa_s
->global
->p2p_cb_on_scan_complete
) {
552 wpa_dbg(wpa_s
, MSG_DEBUG
, "Process pending station "
553 "mode scan during P2P search");
555 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan "
556 "while P2P operation is in progress");
557 wpa_s
->sta_scan_pending
= 1;
558 wpa_supplicant_req_scan(wpa_s
, 5, 0);
562 #endif /* CONFIG_P2P */
565 if (gas_query_in_progress(wpa_s
->gas
)) {
566 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay scan while GAS query is in progress");
567 wpa_supplicant_req_scan(wpa_s
, 1, 0);
570 #endif /* CONFIG_GAS */
572 if (wpa_s
->conf
->ap_scan
== 2)
575 max_ssids
= wpa_s
->max_scan_ssids
;
576 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
577 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
580 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
581 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
583 os_memset(¶ms
, 0, sizeof(params
));
585 prev_state
= wpa_s
->wpa_state
;
586 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
587 wpa_s
->wpa_state
== WPA_INACTIVE
)
588 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
591 * If autoscan has set its own scanning parameters
593 if (wpa_s
->autoscan_params
!= NULL
) {
594 scan_params
= wpa_s
->autoscan_params
;
598 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
599 wpa_s
->connect_without_scan
) {
600 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
601 if (ssid
== wpa_s
->connect_without_scan
)
604 wpa_s
->connect_without_scan
= NULL
;
606 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
607 "without scan step");
608 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
614 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
616 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
617 wpa_s
->p2p_in_provisioning
,
618 wpa_s
->show_group_started
);
619 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
620 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
621 params
.num_ssids
= 1;
624 #endif /* CONFIG_P2P */
626 /* Find the starting point from which to continue scanning */
627 ssid
= wpa_s
->conf
->ssid
;
628 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
630 if (ssid
== wpa_s
->prev_scan_ssid
) {
638 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
639 wpa_s
->conf
->ap_scan
== 2) {
640 wpa_s
->connect_without_scan
= NULL
;
641 wpa_s
->prev_scan_wildcard
= 0;
642 wpa_supplicant_assoc_try(wpa_s
, ssid
);
644 } else if (wpa_s
->conf
->ap_scan
== 2) {
646 * User-initiated scan request in ap_scan == 2; scan with
651 struct wpa_ssid
*start
= ssid
, *tssid
;
653 if (ssid
== NULL
&& max_ssids
> 1)
654 ssid
= wpa_s
->conf
->ssid
;
656 if (!wpas_network_disabled(wpa_s
, ssid
) &&
658 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
659 ssid
->ssid
, ssid
->ssid_len
);
660 params
.ssids
[params
.num_ssids
].ssid
=
662 params
.ssids
[params
.num_ssids
].ssid_len
=
665 if (params
.num_ssids
+ 1 >= max_ssids
)
671 if (ssid
== NULL
&& max_ssids
> 1 &&
672 start
!= wpa_s
->conf
->ssid
)
673 ssid
= wpa_s
->conf
->ssid
;
676 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
677 if (wpas_network_disabled(wpa_s
, tssid
))
679 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
680 int_array_concat(¶ms
.freqs
,
683 os_free(params
.freqs
);
688 int_array_sort_unique(params
.freqs
);
691 if (ssid
&& max_ssids
== 1) {
693 * If the driver is limited to 1 SSID at a time interleave
694 * wildcard SSID scans with specific SSID scans to avoid
695 * waiting a long time for a wildcard scan.
697 if (!wpa_s
->prev_scan_wildcard
) {
698 params
.ssids
[0].ssid
= NULL
;
699 params
.ssids
[0].ssid_len
= 0;
700 wpa_s
->prev_scan_wildcard
= 1;
701 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
702 "wildcard SSID (Interleave with specific)");
704 wpa_s
->prev_scan_ssid
= ssid
;
705 wpa_s
->prev_scan_wildcard
= 0;
706 wpa_dbg(wpa_s
, MSG_DEBUG
,
707 "Starting AP scan for specific SSID: %s",
708 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
713 wpa_s
->prev_scan_ssid
= ssid
;
714 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
717 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
718 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
719 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
721 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
723 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
728 #endif /* CONFIG_P2P */
730 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
731 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
733 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
734 wpa_s
->manual_scan_only_new
)
735 params
.only_new_results
= 1;
737 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
738 wpa_s
->manual_scan_freqs
) {
739 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
740 params
.freqs
= wpa_s
->manual_scan_freqs
;
741 wpa_s
->manual_scan_freqs
= NULL
;
744 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
745 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
746 "generated frequency list");
747 params
.freqs
= wpa_s
->next_scan_freqs
;
749 os_free(wpa_s
->next_scan_freqs
);
750 wpa_s
->next_scan_freqs
= NULL
;
751 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
753 /* See if user specified frequencies. If so, scan only those. */
754 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
755 wpa_dbg(wpa_s
, MSG_DEBUG
,
756 "Optimize scan based on conf->freq_list");
757 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
760 /* Use current associated channel? */
761 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
762 unsigned int num
= wpa_s
->num_multichan_concurrent
;
764 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
766 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
768 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
769 "current operating channels since "
770 "scan_cur_freq is enabled");
772 os_free(params
.freqs
);
778 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
779 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
781 params
.extra_ies
= wpabuf_head(extra_ie
);
782 params
.extra_ies_len
= wpabuf_len(extra_ie
);
786 if (wpa_s
->p2p_in_provisioning
||
787 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
789 * The interface may not yet be in P2P mode, so we have to
790 * explicitly request P2P probe to disable CCK rates.
792 params
.p2p_probe
= 1;
794 #endif /* CONFIG_P2P */
796 scan_params
= ¶ms
;
801 * If the driver does not support multi-channel concurrency and a
802 * virtual interface that shares the same radio with the wpa_s interface
803 * is operating there may not be need to scan other channels apart from
804 * the current operating channel on the other virtual interface. Filter
805 * out other channels in case we are trying to find a connection for a
806 * station interface when we are not configured to prefer station
807 * connection and a concurrent operation is already in process.
809 if (wpa_s
->scan_for_connection
&&
810 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
811 !scan_params
->freqs
&& !params
.freqs
&&
812 wpas_is_p2p_prioritized(wpa_s
) &&
813 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
814 non_p2p_network_enabled(wpa_s
)) {
815 unsigned int num
= wpa_s
->num_multichan_concurrent
;
817 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
819 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
820 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
821 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
823 os_free(params
.freqs
);
828 #endif /* CONFIG_P2P */
830 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
832 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
833 !wpa_s
->manual_scan_freqs
) {
834 /* Restore manual_scan_freqs for the next attempt */
835 wpa_s
->manual_scan_freqs
= params
.freqs
;
839 wpabuf_free(extra_ie
);
840 os_free(params
.freqs
);
841 os_free(params
.filter_ssids
);
844 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
845 if (prev_state
!= wpa_s
->wpa_state
)
846 wpa_supplicant_set_state(wpa_s
, prev_state
);
847 /* Restore scan_req since we will try to scan again */
848 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
849 wpa_supplicant_req_scan(wpa_s
, 1, 0);
851 wpa_s
->scan_for_connection
= 0;
856 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
858 struct os_reltime remaining
, new_int
;
861 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
866 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
867 new_int
.sec
= remaining
.sec
;
868 new_int
.usec
= remaining
.usec
;
872 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
873 wpa_supplicant_scan
, wpa_s
, NULL
);
875 wpa_s
->scan_interval
= sec
;
880 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
881 * @wpa_s: Pointer to wpa_supplicant data
882 * @sec: Number of seconds after which to scan
883 * @usec: Number of microseconds after which to scan
885 * This function is used to schedule a scan for neighboring access points after
886 * the specified time.
888 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
890 if (eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
))
892 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d sec %d usec",
897 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d sec %d usec",
899 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
900 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
905 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
906 * @wpa_s: Pointer to wpa_supplicant data
907 * @sec: Number of seconds after which to scan
908 * @usec: Number of microseconds after which to scan
909 * Returns: 0 on success or -1 otherwise
911 * This function is used to schedule periodic scans for neighboring
912 * access points after the specified time.
914 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
917 if (!wpa_s
->sched_scan_supported
)
920 eloop_register_timeout(sec
, usec
,
921 wpa_supplicant_delayed_sched_scan_timeout
,
929 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
930 * @wpa_s: Pointer to wpa_supplicant data
931 * Returns: 0 is sched_scan was started or -1 otherwise
933 * This function is used to schedule periodic scans for neighboring
934 * access points repeating the scan continuously.
936 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
938 struct wpa_driver_scan_params params
;
939 struct wpa_driver_scan_params
*scan_params
;
940 enum wpa_states prev_state
;
941 struct wpa_ssid
*ssid
= NULL
;
942 struct wpabuf
*extra_ie
= NULL
;
944 unsigned int max_sched_scan_ssids
;
948 if (!wpa_s
->sched_scan_supported
)
951 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
952 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
954 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
955 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
958 if (wpa_s
->sched_scanning
) {
959 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
964 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
965 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
966 /* Use wildcard SSID to find this network */
968 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
973 if (!wpas_network_disabled(wpa_s
, ssid
) &&
974 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
976 * Normal scan is more reliable and faster for WPS
977 * operations and since these are for short periods of
978 * time, the benefit of trying to use sched_scan would
981 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
982 "sched_scan for WPS");
985 #endif /* CONFIG_WPS */
990 if (wpa_s
->normal_scans
< 3 &&
991 (need_ssids
<= wpa_s
->max_scan_ssids
||
992 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
994 * When normal scan can speed up operations, use that for the
995 * first operations before starting the sched_scan to allow
996 * user space sleep more. We do this only if the normal scan
997 * has functionality that is suitable for this or if the
998 * sched_scan does not have better support for multiple SSIDs.
1000 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1001 "sched_scan for initial scans (normal_scans=%d)",
1002 wpa_s
->normal_scans
);
1006 os_memset(¶ms
, 0, sizeof(params
));
1008 /* If we can't allocate space for the filters, we just don't filter */
1009 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
1010 sizeof(struct wpa_driver_scan_filter
));
1012 prev_state
= wpa_s
->wpa_state
;
1013 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1014 wpa_s
->wpa_state
== WPA_INACTIVE
)
1015 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1017 if (wpa_s
->autoscan_params
!= NULL
) {
1018 scan_params
= wpa_s
->autoscan_params
;
1022 /* Find the starting point from which to continue scanning */
1023 ssid
= wpa_s
->conf
->ssid
;
1024 if (wpa_s
->prev_sched_ssid
) {
1026 if (ssid
== wpa_s
->prev_sched_ssid
) {
1034 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1035 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1036 if (wpa_s
->conf
->sched_scan_interval
)
1037 wpa_s
->sched_scan_interval
=
1038 wpa_s
->conf
->sched_scan_interval
;
1039 if (wpa_s
->sched_scan_interval
== 0)
1040 wpa_s
->sched_scan_interval
= 10;
1041 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1042 wpa_s
->first_sched_scan
= 1;
1043 ssid
= wpa_s
->conf
->ssid
;
1044 wpa_s
->prev_sched_ssid
= ssid
;
1048 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1053 if (wpas_network_disabled(wpa_s
, ssid
))
1056 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1057 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1058 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1059 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1060 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1061 ssid
->ssid
, ssid
->ssid_len
);
1062 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1064 params
.num_filter_ssids
++;
1065 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1067 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1068 "filter for sched_scan - drop filter");
1069 os_free(params
.filter_ssids
);
1070 params
.filter_ssids
= NULL
;
1071 params
.num_filter_ssids
= 0;
1074 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1075 if (params
.num_ssids
== max_sched_scan_ssids
)
1076 break; /* only room for broadcast SSID */
1077 wpa_dbg(wpa_s
, MSG_DEBUG
,
1078 "add to active scan ssid: %s",
1079 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1080 params
.ssids
[params
.num_ssids
].ssid
=
1082 params
.ssids
[params
.num_ssids
].ssid_len
=
1085 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1086 wpa_s
->prev_sched_ssid
= ssid
;
1090 (wpas_network_disabled(wpa_s
, ssid
) ||
1097 wpa_s
->prev_sched_ssid
= ssid
;
1101 if (params
.num_filter_ssids
== 0) {
1102 os_free(params
.filter_ssids
);
1103 params
.filter_ssids
= NULL
;
1106 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1108 params
.extra_ies
= wpabuf_head(extra_ie
);
1109 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1112 scan_params
= ¶ms
;
1115 if (ssid
|| !wpa_s
->first_sched_scan
) {
1116 wpa_dbg(wpa_s
, MSG_DEBUG
,
1117 "Starting sched scan: interval %d timeout %d",
1118 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1120 wpa_dbg(wpa_s
, MSG_DEBUG
,
1121 "Starting sched scan: interval %d (no timeout)",
1122 wpa_s
->sched_scan_interval
);
1125 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1127 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1128 wpa_s
->sched_scan_interval
);
1129 wpabuf_free(extra_ie
);
1130 os_free(params
.filter_ssids
);
1132 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1133 if (prev_state
!= wpa_s
->wpa_state
)
1134 wpa_supplicant_set_state(wpa_s
, prev_state
);
1138 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1139 if (ssid
|| !wpa_s
->first_sched_scan
) {
1140 wpa_s
->sched_scan_timed_out
= 0;
1141 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1142 wpa_supplicant_sched_scan_timeout
,
1144 wpa_s
->first_sched_scan
= 0;
1145 wpa_s
->sched_scan_timeout
/= 2;
1146 wpa_s
->sched_scan_interval
*= 2;
1147 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1148 wpa_s
->sched_scan_interval
= 10;
1149 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1153 /* If there is no more ssids, start next time from the beginning */
1155 wpa_s
->prev_sched_ssid
= NULL
;
1162 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1163 * @wpa_s: Pointer to wpa_supplicant data
1165 * This function is used to cancel a scan request scheduled with
1166 * wpa_supplicant_req_scan().
1168 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1170 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1171 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1172 wpas_p2p_continue_after_scan(wpa_s
);
1177 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1178 * @wpa_s: Pointer to wpa_supplicant data
1180 * This function is used to stop a delayed scheduled scan.
1182 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1184 if (!wpa_s
->sched_scan_supported
)
1187 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1188 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1194 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1195 * @wpa_s: Pointer to wpa_supplicant data
1197 * This function is used to stop a periodic scheduled scan.
1199 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1201 if (!wpa_s
->sched_scanning
)
1204 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1205 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1206 wpa_supplicant_stop_sched_scan(wpa_s
);
1211 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1212 * @wpa_s: Pointer to wpa_supplicant data
1213 * @scanning: Whether scanning is currently in progress
1215 * This function is to generate scanning notifycations. It is called whenever
1216 * there may have been a change in scanning (scan started, completed, stopped).
1217 * wpas_notify_scanning() is called whenever the scanning state changed from the
1218 * previously notified state.
1220 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1223 if (wpa_s
->scanning
!= scanning
) {
1224 wpa_s
->scanning
= scanning
;
1225 wpas_notify_scanning(wpa_s
);
1230 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1236 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1237 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1238 if ((ie
[i
+ 2] & 0x7f) > rate
)
1239 rate
= ie
[i
+ 2] & 0x7f;
1242 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1243 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1244 if ((ie
[i
+ 2] & 0x7f) > rate
)
1245 rate
= ie
[i
+ 2] & 0x7f;
1253 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1254 * @res: Scan result entry
1255 * @ie: Information element identitifier (WLAN_EID_*)
1256 * Returns: Pointer to the information element (id field) or %NULL if not found
1258 * This function returns the first matching information element in the scan
1261 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1263 const u8
*end
, *pos
;
1265 pos
= (const u8
*) (res
+ 1);
1266 end
= pos
+ res
->ie_len
;
1268 while (pos
+ 1 < end
) {
1269 if (pos
+ 2 + pos
[1] > end
)
1281 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1282 * @res: Scan result entry
1283 * @vendor_type: Vendor type (four octets starting the IE payload)
1284 * Returns: Pointer to the information element (id field) or %NULL if not found
1286 * This function returns the first matching information element in the scan
1289 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1292 const u8
*end
, *pos
;
1294 pos
= (const u8
*) (res
+ 1);
1295 end
= pos
+ res
->ie_len
;
1297 while (pos
+ 1 < end
) {
1298 if (pos
+ 2 + pos
[1] > end
)
1300 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1301 vendor_type
== WPA_GET_BE32(&pos
[2]))
1311 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1312 * @res: Scan result entry
1313 * @vendor_type: Vendor type (four octets starting the IE payload)
1314 * Returns: Pointer to the information element (id field) or %NULL if not found
1316 * This function returns the first matching information element in the scan
1319 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1320 * from Beacon frames instead of either Beacon or Probe Response frames.
1322 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1325 const u8
*end
, *pos
;
1327 if (res
->beacon_ie_len
== 0)
1330 pos
= (const u8
*) (res
+ 1);
1332 end
= pos
+ res
->beacon_ie_len
;
1334 while (pos
+ 1 < end
) {
1335 if (pos
+ 2 + pos
[1] > end
)
1337 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1338 vendor_type
== WPA_GET_BE32(&pos
[2]))
1348 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1349 * @res: Scan result entry
1350 * @vendor_type: Vendor type (four octets starting the IE payload)
1351 * Returns: Pointer to the information element payload or %NULL if not found
1353 * This function returns concatenated payload of possibly fragmented vendor
1354 * specific information elements in the scan result. The caller is responsible
1355 * for freeing the returned buffer.
1357 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1361 const u8
*end
, *pos
;
1363 buf
= wpabuf_alloc(res
->ie_len
);
1367 pos
= (const u8
*) (res
+ 1);
1368 end
= pos
+ res
->ie_len
;
1370 while (pos
+ 1 < end
) {
1371 if (pos
+ 2 + pos
[1] > end
)
1373 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1374 vendor_type
== WPA_GET_BE32(&pos
[2]))
1375 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1379 if (wpabuf_len(buf
) == 0) {
1389 * Channels with a great SNR can operate at full rate. What is a great SNR?
1390 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1391 * rule of thumb is that any SNR above 20 is good." This one
1392 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1393 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1394 * conservative value.
1396 #define GREAT_SNR 30
1398 /* Compare function for sorting scan results. Return >0 if @b is considered
1400 static int wpa_scan_result_compar(const void *a
, const void *b
)
1402 #define IS_5GHZ(n) (n > 4000)
1403 #define MIN(a,b) a < b ? a : b
1404 struct wpa_scan_res
**_wa
= (void *) a
;
1405 struct wpa_scan_res
**_wb
= (void *) b
;
1406 struct wpa_scan_res
*wa
= *_wa
;
1407 struct wpa_scan_res
*wb
= *_wb
;
1408 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1411 /* WPA/WPA2 support preferred */
1412 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1413 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1414 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1415 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1417 if (wpa_b
&& !wpa_a
)
1419 if (!wpa_b
&& wpa_a
)
1422 /* privacy support preferred */
1423 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1424 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1426 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1427 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1430 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1431 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1432 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1433 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1435 /* Not suitable information to calculate SNR, so use level */
1440 /* best/max rate preferred if SNR close enough */
1441 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1442 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1443 maxrate_a
= wpa_scan_get_max_rate(wa
);
1444 maxrate_b
= wpa_scan_get_max_rate(wb
);
1445 if (maxrate_a
!= maxrate_b
)
1446 return maxrate_b
- maxrate_a
;
1447 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1448 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1451 /* use freq for channel preference */
1453 /* all things being equal, use SNR; if SNRs are
1454 * identical, use quality values since some drivers may only report
1455 * that value and leave the signal level zero */
1457 return wb
->qual
- wa
->qual
;
1458 return snr_b
- snr_a
;
1465 /* Compare function for sorting scan results when searching a WPS AP for
1466 * provisioning. Return >0 if @b is considered better. */
1467 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1469 struct wpa_scan_res
**_wa
= (void *) a
;
1470 struct wpa_scan_res
**_wb
= (void *) b
;
1471 struct wpa_scan_res
*wa
= *_wa
;
1472 struct wpa_scan_res
*wb
= *_wb
;
1473 int uses_wps_a
, uses_wps_b
;
1474 struct wpabuf
*wps_a
, *wps_b
;
1477 /* Optimization - check WPS IE existence before allocated memory and
1478 * doing full reassembly. */
1479 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1480 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1481 if (uses_wps_a
&& !uses_wps_b
)
1483 if (!uses_wps_a
&& uses_wps_b
)
1486 if (uses_wps_a
&& uses_wps_b
) {
1487 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1488 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1489 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1497 * Do not use current AP security policy as a sorting criteria during
1498 * WPS provisioning step since the AP may get reconfigured at the
1499 * completion of provisioning.
1502 /* all things being equal, use signal level; if signal levels are
1503 * identical, use quality values since some drivers may only report
1504 * that value and leave the signal level zero */
1505 if (wb
->level
== wa
->level
)
1506 return wb
->qual
- wa
->qual
;
1507 return wb
->level
- wa
->level
;
1509 #endif /* CONFIG_WPS */
1512 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1514 #ifndef CONFIG_NO_STDOUT_DEBUG
1517 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1520 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1522 for (i
= 0; i
< scan_res
->num
; i
++) {
1523 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1525 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1526 == WPA_SCAN_LEVEL_DBM
) {
1527 int snr
= r
->level
- r
->noise
;
1528 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1529 "noise=%d level=%d snr=%d%s flags=0x%x "
1531 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1532 r
->noise
, r
->level
, snr
,
1533 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1536 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1537 "noise=%d level=%d flags=0x%x age=%u",
1538 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1539 r
->noise
, r
->level
, r
->flags
, r
->age
);
1541 pos
= (u8
*) (r
+ 1);
1543 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1545 if (r
->beacon_ie_len
)
1546 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1547 pos
, r
->beacon_ie_len
);
1549 #endif /* CONFIG_NO_STDOUT_DEBUG */
1554 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1555 * @wpa_s: Pointer to wpa_supplicant data
1556 * @bssid: BSSID to check
1557 * Returns: 0 if the BSSID is filtered or 1 if not
1559 * This function is used to filter out specific BSSIDs from scan reslts mainly
1560 * for testing purposes (SET bssid_filter ctrl_iface command).
1562 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1567 if (wpa_s
->bssid_filter
== NULL
)
1570 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1571 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1580 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1581 struct wpa_scan_results
*res
)
1585 if (wpa_s
->bssid_filter
== NULL
)
1588 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1589 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1590 res
->res
[i
]->bssid
)) {
1591 res
->res
[j
++] = res
->res
[i
];
1593 os_free(res
->res
[i
]);
1598 if (res
->num
!= j
) {
1599 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1600 (int) (res
->num
- j
));
1607 * wpa_supplicant_get_scan_results - Get scan results
1608 * @wpa_s: Pointer to wpa_supplicant data
1609 * @info: Information about what was scanned or %NULL if not available
1610 * @new_scan: Whether a new scan was performed
1611 * Returns: Scan results, %NULL on failure
1613 * This function request the current scan results from the driver and updates
1614 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1615 * results with wpa_scan_results_free().
1617 struct wpa_scan_results
*
1618 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1619 struct scan_info
*info
, int new_scan
)
1621 struct wpa_scan_results
*scan_res
;
1623 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1625 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1626 if (scan_res
== NULL
) {
1627 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1630 if (scan_res
->fetch_time
.sec
== 0) {
1632 * Make sure we have a valid timestamp if the driver wrapper
1633 * does not set this.
1635 os_get_reltime(&scan_res
->fetch_time
);
1637 filter_scan_res(wpa_s
, scan_res
);
1640 if (wpas_wps_searching(wpa_s
)) {
1641 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1642 "provisioning rules");
1643 compar
= wpa_scan_result_wps_compar
;
1645 #endif /* CONFIG_WPS */
1647 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1649 dump_scan_res(scan_res
);
1651 wpa_bss_update_start(wpa_s
);
1652 for (i
= 0; i
< scan_res
->num
; i
++)
1653 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1654 &scan_res
->fetch_time
);
1655 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1662 * wpa_supplicant_update_scan_results - Update scan results from the driver
1663 * @wpa_s: Pointer to wpa_supplicant data
1664 * Returns: 0 on success, -1 on failure
1666 * This function updates the BSS table within wpa_supplicant based on the
1667 * currently available scan results from the driver without requesting a new
1668 * scan. This is used in cases where the driver indicates an association
1669 * (including roaming within ESS) and wpa_supplicant does not yet have the
1670 * needed information to complete the connection (e.g., to perform validation
1671 * steps in 4-way handshake).
1673 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1675 struct wpa_scan_results
*scan_res
;
1676 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1677 if (scan_res
== NULL
)
1679 wpa_scan_results_free(scan_res
);
1686 * scan_only_handler - Reports scan results
1688 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1689 struct wpa_scan_results
*scan_res
)
1691 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1692 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
1693 wpa_s
->manual_scan_use_id
&& wpa_s
->own_scan_running
) {
1694 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
"id=%u",
1695 wpa_s
->manual_scan_id
);
1696 wpa_s
->manual_scan_use_id
= 0;
1698 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1700 wpas_notify_scan_results(wpa_s
);
1701 wpas_notify_scan_done(wpa_s
, 1);
1705 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1707 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);