2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
16 #include "wpa_supplicant_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
21 #include "hs20_supplicant.h"
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 void wpas_trigger_scan_cb(struct wpa_radio_work
*work
, int deinit
)
146 struct wpa_supplicant
*wpa_s
= work
->wpa_s
;
147 struct wpa_driver_scan_params
*params
= work
->ctx
;
151 if (!work
->started
) {
152 wpa_scan_free_params(params
);
155 wpa_supplicant_notify_scanning(wpa_s
, 0);
156 wpas_notify_scan_done(wpa_s
, 0);
157 wpa_s
->scan_work
= NULL
;
161 wpa_supplicant_notify_scanning(wpa_s
, 1);
163 if (wpa_s
->clear_driver_scan_cache
)
164 params
->only_new_results
= 1;
165 ret
= wpa_drv_scan(wpa_s
, params
);
166 wpa_scan_free_params(params
);
169 wpa_supplicant_notify_scanning(wpa_s
, 0);
170 wpas_notify_scan_done(wpa_s
, 0);
171 radio_work_done(work
);
175 os_get_reltime(&wpa_s
->scan_trigger_time
);
177 wpa_s
->normal_scans
++;
178 wpa_s
->own_scan_requested
= 1;
179 wpa_s
->clear_driver_scan_cache
= 0;
180 wpa_s
->scan_work
= work
;
185 * wpa_supplicant_trigger_scan - Request driver to start a scan
186 * @wpa_s: Pointer to wpa_supplicant data
187 * @params: Scan parameters
188 * Returns: 0 on success, -1 on failure
190 int wpa_supplicant_trigger_scan(struct wpa_supplicant
*wpa_s
,
191 struct wpa_driver_scan_params
*params
)
193 struct wpa_driver_scan_params
*ctx
;
195 if (wpa_s
->scan_work
) {
196 wpa_dbg(wpa_s
, MSG_INFO
, "Reject scan trigger since one is already pending");
200 ctx
= wpa_scan_clone_params(params
);
204 if (radio_add_work(wpa_s
, 0, "scan", 0, wpas_trigger_scan_cb
, ctx
) < 0)
206 wpa_scan_free_params(ctx
);
215 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
217 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
219 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting delayed sched scan");
221 if (wpa_supplicant_req_sched_scan(wpa_s
))
222 wpa_supplicant_req_scan(wpa_s
, 0, 0);
227 wpa_supplicant_sched_scan_timeout(void *eloop_ctx
, void *timeout_ctx
)
229 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
231 wpa_dbg(wpa_s
, MSG_DEBUG
, "Sched scan timeout - stopping it");
233 wpa_s
->sched_scan_timed_out
= 1;
234 wpa_supplicant_cancel_sched_scan(wpa_s
);
238 int wpa_supplicant_start_sched_scan(struct wpa_supplicant
*wpa_s
,
239 struct wpa_driver_scan_params
*params
,
244 wpa_supplicant_notify_scanning(wpa_s
, 1);
245 ret
= wpa_drv_sched_scan(wpa_s
, params
, interval
* 1000);
247 wpa_supplicant_notify_scanning(wpa_s
, 0);
249 wpa_s
->sched_scanning
= 1;
255 int wpa_supplicant_stop_sched_scan(struct wpa_supplicant
*wpa_s
)
259 ret
= wpa_drv_stop_sched_scan(wpa_s
);
261 wpa_dbg(wpa_s
, MSG_DEBUG
, "stopping sched_scan failed!");
262 /* TODO: what to do if stopping fails? */
270 static struct wpa_driver_scan_filter
*
271 wpa_supplicant_build_filter_ssids(struct wpa_config
*conf
, size_t *num_ssids
)
273 struct wpa_driver_scan_filter
*ssids
;
274 struct wpa_ssid
*ssid
;
278 if (!conf
->filter_ssids
)
281 for (count
= 0, ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
282 if (ssid
->ssid
&& ssid
->ssid_len
)
287 ssids
= os_zalloc(count
* sizeof(struct wpa_driver_scan_filter
));
291 for (ssid
= conf
->ssid
; ssid
; ssid
= ssid
->next
) {
292 if (!ssid
->ssid
|| !ssid
->ssid_len
)
294 os_memcpy(ssids
[*num_ssids
].ssid
, ssid
->ssid
, ssid
->ssid_len
);
295 ssids
[*num_ssids
].ssid_len
= ssid
->ssid_len
;
303 static void wpa_supplicant_optimize_freqs(
304 struct wpa_supplicant
*wpa_s
, struct wpa_driver_scan_params
*params
)
307 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_provisioning
&&
309 /* Optimize provisioning state scan based on GO information */
310 if (wpa_s
->p2p_in_provisioning
< 5 &&
311 wpa_s
->go_params
->freq
> 0) {
312 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO "
313 "preferred frequency %d MHz",
314 wpa_s
->go_params
->freq
);
315 params
->freqs
= os_zalloc(2 * sizeof(int));
317 params
->freqs
[0] = wpa_s
->go_params
->freq
;
318 } else if (wpa_s
->p2p_in_provisioning
< 8 &&
319 wpa_s
->go_params
->freq_list
[0]) {
320 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only common "
322 int_array_concat(¶ms
->freqs
,
323 wpa_s
->go_params
->freq_list
);
325 int_array_sort_unique(params
->freqs
);
327 wpa_s
->p2p_in_provisioning
++;
329 #endif /* CONFIG_P2P */
332 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
334 * Optimize post-provisioning scan based on channel used
335 * during provisioning.
337 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
338 "that was used during provisioning", wpa_s
->wps_freq
);
339 params
->freqs
= os_zalloc(2 * sizeof(int));
341 params
->freqs
[0] = wpa_s
->wps_freq
;
343 } else if (wpa_s
->after_wps
)
346 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
348 /* Optimize provisioning scan based on already known channel */
349 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
351 params
->freqs
= os_zalloc(2 * sizeof(int));
353 params
->freqs
[0] = wpa_s
->wps_freq
;
354 wpa_s
->known_wps_freq
= 0; /* only do this once */
356 #endif /* CONFIG_WPS */
360 #ifdef CONFIG_INTERWORKING
361 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
364 if (wpa_s
->conf
->interworking
== 0)
367 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
368 wpabuf_put_u8(buf
, 4);
369 wpabuf_put_u8(buf
, 0x00);
370 wpabuf_put_u8(buf
, 0x00);
371 wpabuf_put_u8(buf
, 0x00);
372 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
374 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
375 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
377 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
379 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
380 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
382 #endif /* CONFIG_INTERWORKING */
385 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
387 struct wpabuf
*extra_ie
= NULL
;
390 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
391 #endif /* CONFIG_WPS */
393 #ifdef CONFIG_INTERWORKING
394 if (wpa_s
->conf
->interworking
&&
395 wpabuf_resize(&extra_ie
, 100) == 0)
396 wpas_add_interworking_elements(wpa_s
, extra_ie
);
397 #endif /* CONFIG_INTERWORKING */
400 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
403 struct wpabuf
*wps_ie
;
404 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
407 wpa_s
->wps
->uuid
, req_type
,
410 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
411 wpabuf_put_buf(extra_ie
, wps_ie
);
418 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
419 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
420 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
422 #endif /* CONFIG_P2P */
424 #endif /* CONFIG_WPS */
427 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
428 wpas_hs20_add_indication(extra_ie
, -1);
429 #endif /* CONFIG_HS20 */
438 * Check whether there are any enabled networks or credentials that could be
439 * used for a non-P2P connection.
441 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
443 struct wpa_ssid
*ssid
;
445 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
446 if (wpas_network_disabled(wpa_s
, ssid
))
448 if (!ssid
->p2p_group
)
452 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
453 wpa_s
->conf
->auto_interworking
)
459 #endif /* CONFIG_P2P */
462 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
464 enum hostapd_hw_mode mode
)
468 for (i
= 0; i
< num_modes
; i
++) {
469 if (modes
[i
].mode
== mode
)
477 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
478 enum hostapd_hw_mode band
,
479 struct wpa_driver_scan_params
*params
)
481 /* Include only supported channels for the specified band */
482 struct hostapd_hw_modes
*mode
;
485 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
487 /* No channels supported in this band - use empty list */
488 params
->freqs
= os_zalloc(sizeof(int));
492 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
493 if (params
->freqs
== NULL
)
495 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
496 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
498 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
503 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
504 struct wpa_driver_scan_params
*params
)
506 if (wpa_s
->hw
.modes
== NULL
)
507 return; /* unknown what channels the driver supports */
509 return; /* already using a limited channel set */
510 if (wpa_s
->setband
== WPA_SETBAND_5G
)
511 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
513 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
514 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
519 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
521 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
522 struct wpa_ssid
*ssid
;
524 struct wpabuf
*extra_ie
= NULL
;
525 struct wpa_driver_scan_params params
;
526 struct wpa_driver_scan_params
*scan_params
;
528 enum wpa_states prev_state
;
530 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
) {
531 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - PNO is in progress");
535 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
536 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
540 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
541 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
542 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
546 if (wpa_s
->scanning
) {
548 * If we are already in scanning state, we shall reschedule the
549 * the incoming scan request.
551 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
552 wpa_supplicant_req_scan(wpa_s
, 1, 0);
556 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
557 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
558 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
559 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
563 if (wpa_s
->conf
->ap_scan
!= 0 &&
564 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
565 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
566 "overriding ap_scan configuration");
567 wpa_s
->conf
->ap_scan
= 0;
568 wpas_notify_ap_scan_changed(wpa_s
);
571 if (wpa_s
->conf
->ap_scan
== 0) {
572 wpa_supplicant_gen_assoc_event(wpa_s
);
577 if (wpas_p2p_in_progress(wpa_s
)) {
578 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan while P2P operation is in progress");
579 wpa_supplicant_req_scan(wpa_s
, 5, 0);
582 #endif /* CONFIG_P2P */
584 if (wpa_s
->conf
->ap_scan
== 2)
587 max_ssids
= wpa_s
->max_scan_ssids
;
588 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
589 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
592 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
593 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
595 os_memset(¶ms
, 0, sizeof(params
));
597 prev_state
= wpa_s
->wpa_state
;
598 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
599 wpa_s
->wpa_state
== WPA_INACTIVE
)
600 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
603 * If autoscan has set its own scanning parameters
605 if (wpa_s
->autoscan_params
!= NULL
) {
606 scan_params
= wpa_s
->autoscan_params
;
610 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
611 wpa_s
->connect_without_scan
) {
612 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
613 if (ssid
== wpa_s
->connect_without_scan
)
616 wpa_s
->connect_without_scan
= NULL
;
618 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
619 "without scan step");
620 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
626 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
628 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
629 wpa_s
->p2p_in_provisioning
,
630 wpa_s
->show_group_started
);
631 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
632 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
633 params
.num_ssids
= 1;
636 #endif /* CONFIG_P2P */
638 /* Find the starting point from which to continue scanning */
639 ssid
= wpa_s
->conf
->ssid
;
640 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
642 if (ssid
== wpa_s
->prev_scan_ssid
) {
650 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
651 wpa_s
->conf
->ap_scan
== 2) {
652 wpa_s
->connect_without_scan
= NULL
;
653 wpa_s
->prev_scan_wildcard
= 0;
654 wpa_supplicant_assoc_try(wpa_s
, ssid
);
656 } else if (wpa_s
->conf
->ap_scan
== 2) {
658 * User-initiated scan request in ap_scan == 2; scan with
663 struct wpa_ssid
*start
= ssid
, *tssid
;
665 if (ssid
== NULL
&& max_ssids
> 1)
666 ssid
= wpa_s
->conf
->ssid
;
668 if (!wpas_network_disabled(wpa_s
, ssid
) &&
670 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
671 ssid
->ssid
, ssid
->ssid_len
);
672 params
.ssids
[params
.num_ssids
].ssid
=
674 params
.ssids
[params
.num_ssids
].ssid_len
=
677 if (params
.num_ssids
+ 1 >= max_ssids
)
683 if (ssid
== NULL
&& max_ssids
> 1 &&
684 start
!= wpa_s
->conf
->ssid
)
685 ssid
= wpa_s
->conf
->ssid
;
688 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
689 if (wpas_network_disabled(wpa_s
, tssid
))
691 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
692 int_array_concat(¶ms
.freqs
,
695 os_free(params
.freqs
);
700 int_array_sort_unique(params
.freqs
);
703 if (ssid
&& max_ssids
== 1) {
705 * If the driver is limited to 1 SSID at a time interleave
706 * wildcard SSID scans with specific SSID scans to avoid
707 * waiting a long time for a wildcard scan.
709 if (!wpa_s
->prev_scan_wildcard
) {
710 params
.ssids
[0].ssid
= NULL
;
711 params
.ssids
[0].ssid_len
= 0;
712 wpa_s
->prev_scan_wildcard
= 1;
713 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
714 "wildcard SSID (Interleave with specific)");
716 wpa_s
->prev_scan_ssid
= ssid
;
717 wpa_s
->prev_scan_wildcard
= 0;
718 wpa_dbg(wpa_s
, MSG_DEBUG
,
719 "Starting AP scan for specific SSID: %s",
720 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
725 wpa_s
->prev_scan_ssid
= ssid
;
726 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
729 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
730 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
731 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
733 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
735 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
740 #endif /* CONFIG_P2P */
742 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
743 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
745 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
746 wpa_s
->manual_scan_only_new
)
747 params
.only_new_results
= 1;
749 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
750 wpa_s
->manual_scan_freqs
) {
751 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
752 params
.freqs
= wpa_s
->manual_scan_freqs
;
753 wpa_s
->manual_scan_freqs
= NULL
;
756 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
757 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
758 "generated frequency list");
759 params
.freqs
= wpa_s
->next_scan_freqs
;
761 os_free(wpa_s
->next_scan_freqs
);
762 wpa_s
->next_scan_freqs
= NULL
;
763 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
765 /* See if user specified frequencies. If so, scan only those. */
766 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
767 wpa_dbg(wpa_s
, MSG_DEBUG
,
768 "Optimize scan based on conf->freq_list");
769 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
772 /* Use current associated channel? */
773 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
774 unsigned int num
= wpa_s
->num_multichan_concurrent
;
776 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
778 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
780 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
781 "current operating channels since "
782 "scan_cur_freq is enabled");
784 os_free(params
.freqs
);
790 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
791 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
793 params
.extra_ies
= wpabuf_head(extra_ie
);
794 params
.extra_ies_len
= wpabuf_len(extra_ie
);
798 if (wpa_s
->p2p_in_provisioning
||
799 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
801 * The interface may not yet be in P2P mode, so we have to
802 * explicitly request P2P probe to disable CCK rates.
804 params
.p2p_probe
= 1;
806 #endif /* CONFIG_P2P */
808 scan_params
= ¶ms
;
813 * If the driver does not support multi-channel concurrency and a
814 * virtual interface that shares the same radio with the wpa_s interface
815 * is operating there may not be need to scan other channels apart from
816 * the current operating channel on the other virtual interface. Filter
817 * out other channels in case we are trying to find a connection for a
818 * station interface when we are not configured to prefer station
819 * connection and a concurrent operation is already in process.
821 if (wpa_s
->scan_for_connection
&&
822 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
823 !scan_params
->freqs
&& !params
.freqs
&&
824 wpas_is_p2p_prioritized(wpa_s
) &&
825 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
826 non_p2p_network_enabled(wpa_s
)) {
827 unsigned int num
= wpa_s
->num_multichan_concurrent
;
829 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
831 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
832 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
833 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
835 os_free(params
.freqs
);
840 #endif /* CONFIG_P2P */
842 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
844 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
845 !wpa_s
->manual_scan_freqs
) {
846 /* Restore manual_scan_freqs for the next attempt */
847 wpa_s
->manual_scan_freqs
= params
.freqs
;
851 wpabuf_free(extra_ie
);
852 os_free(params
.freqs
);
853 os_free(params
.filter_ssids
);
856 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
857 if (prev_state
!= wpa_s
->wpa_state
)
858 wpa_supplicant_set_state(wpa_s
, prev_state
);
859 /* Restore scan_req since we will try to scan again */
860 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
861 wpa_supplicant_req_scan(wpa_s
, 1, 0);
863 wpa_s
->scan_for_connection
= 0;
868 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
870 struct os_reltime remaining
, new_int
;
873 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
878 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
879 new_int
.sec
= remaining
.sec
;
880 new_int
.usec
= remaining
.usec
;
884 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
885 wpa_supplicant_scan
, wpa_s
, NULL
);
887 wpa_s
->scan_interval
= sec
;
892 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
893 * @wpa_s: Pointer to wpa_supplicant data
894 * @sec: Number of seconds after which to scan
895 * @usec: Number of microseconds after which to scan
897 * This function is used to schedule a scan for neighboring access points after
898 * the specified time.
900 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
902 int res
= eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
,
905 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d.%06d sec",
907 } else if (res
== 0) {
908 wpa_dbg(wpa_s
, MSG_DEBUG
, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
911 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d.%06d sec",
913 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
919 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
920 * @wpa_s: Pointer to wpa_supplicant data
921 * @sec: Number of seconds after which to scan
922 * @usec: Number of microseconds after which to scan
923 * Returns: 0 on success or -1 otherwise
925 * This function is used to schedule periodic scans for neighboring
926 * access points after the specified time.
928 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
931 if (!wpa_s
->sched_scan_supported
)
934 eloop_register_timeout(sec
, usec
,
935 wpa_supplicant_delayed_sched_scan_timeout
,
943 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
944 * @wpa_s: Pointer to wpa_supplicant data
945 * Returns: 0 is sched_scan was started or -1 otherwise
947 * This function is used to schedule periodic scans for neighboring
948 * access points repeating the scan continuously.
950 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
952 struct wpa_driver_scan_params params
;
953 struct wpa_driver_scan_params
*scan_params
;
954 enum wpa_states prev_state
;
955 struct wpa_ssid
*ssid
= NULL
;
956 struct wpabuf
*extra_ie
= NULL
;
958 unsigned int max_sched_scan_ssids
;
962 if (!wpa_s
->sched_scan_supported
)
965 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
966 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
968 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
969 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
972 if (wpa_s
->sched_scanning
) {
973 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
978 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
979 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
980 /* Use wildcard SSID to find this network */
982 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
987 if (!wpas_network_disabled(wpa_s
, ssid
) &&
988 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
990 * Normal scan is more reliable and faster for WPS
991 * operations and since these are for short periods of
992 * time, the benefit of trying to use sched_scan would
995 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
996 "sched_scan for WPS");
999 #endif /* CONFIG_WPS */
1004 if (wpa_s
->normal_scans
< 3 &&
1005 (need_ssids
<= wpa_s
->max_scan_ssids
||
1006 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
1008 * When normal scan can speed up operations, use that for the
1009 * first operations before starting the sched_scan to allow
1010 * user space sleep more. We do this only if the normal scan
1011 * has functionality that is suitable for this or if the
1012 * sched_scan does not have better support for multiple SSIDs.
1014 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1015 "sched_scan for initial scans (normal_scans=%d)",
1016 wpa_s
->normal_scans
);
1020 os_memset(¶ms
, 0, sizeof(params
));
1022 /* If we can't allocate space for the filters, we just don't filter */
1023 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
1024 sizeof(struct wpa_driver_scan_filter
));
1026 prev_state
= wpa_s
->wpa_state
;
1027 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1028 wpa_s
->wpa_state
== WPA_INACTIVE
)
1029 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1031 if (wpa_s
->autoscan_params
!= NULL
) {
1032 scan_params
= wpa_s
->autoscan_params
;
1036 /* Find the starting point from which to continue scanning */
1037 ssid
= wpa_s
->conf
->ssid
;
1038 if (wpa_s
->prev_sched_ssid
) {
1040 if (ssid
== wpa_s
->prev_sched_ssid
) {
1048 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1049 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1050 if (wpa_s
->conf
->sched_scan_interval
)
1051 wpa_s
->sched_scan_interval
=
1052 wpa_s
->conf
->sched_scan_interval
;
1053 if (wpa_s
->sched_scan_interval
== 0)
1054 wpa_s
->sched_scan_interval
= 10;
1055 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1056 wpa_s
->first_sched_scan
= 1;
1057 ssid
= wpa_s
->conf
->ssid
;
1058 wpa_s
->prev_sched_ssid
= ssid
;
1062 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1067 if (wpas_network_disabled(wpa_s
, ssid
))
1070 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1071 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1072 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1073 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1074 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1075 ssid
->ssid
, ssid
->ssid_len
);
1076 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1078 params
.num_filter_ssids
++;
1079 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1081 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1082 "filter for sched_scan - drop filter");
1083 os_free(params
.filter_ssids
);
1084 params
.filter_ssids
= NULL
;
1085 params
.num_filter_ssids
= 0;
1088 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1089 if (params
.num_ssids
== max_sched_scan_ssids
)
1090 break; /* only room for broadcast SSID */
1091 wpa_dbg(wpa_s
, MSG_DEBUG
,
1092 "add to active scan ssid: %s",
1093 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1094 params
.ssids
[params
.num_ssids
].ssid
=
1096 params
.ssids
[params
.num_ssids
].ssid_len
=
1099 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1100 wpa_s
->prev_sched_ssid
= ssid
;
1104 (wpas_network_disabled(wpa_s
, ssid
) ||
1111 wpa_s
->prev_sched_ssid
= ssid
;
1115 if (params
.num_filter_ssids
== 0) {
1116 os_free(params
.filter_ssids
);
1117 params
.filter_ssids
= NULL
;
1120 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1122 params
.extra_ies
= wpabuf_head(extra_ie
);
1123 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1126 if (wpa_s
->conf
->filter_rssi
)
1127 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
1129 scan_params
= ¶ms
;
1132 if (ssid
|| !wpa_s
->first_sched_scan
) {
1133 wpa_dbg(wpa_s
, MSG_DEBUG
,
1134 "Starting sched scan: interval %d timeout %d",
1135 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1137 wpa_dbg(wpa_s
, MSG_DEBUG
,
1138 "Starting sched scan: interval %d (no timeout)",
1139 wpa_s
->sched_scan_interval
);
1142 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1144 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1145 wpa_s
->sched_scan_interval
);
1146 wpabuf_free(extra_ie
);
1147 os_free(params
.filter_ssids
);
1149 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1150 if (prev_state
!= wpa_s
->wpa_state
)
1151 wpa_supplicant_set_state(wpa_s
, prev_state
);
1155 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1156 if (ssid
|| !wpa_s
->first_sched_scan
) {
1157 wpa_s
->sched_scan_timed_out
= 0;
1158 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1159 wpa_supplicant_sched_scan_timeout
,
1161 wpa_s
->first_sched_scan
= 0;
1162 wpa_s
->sched_scan_timeout
/= 2;
1163 wpa_s
->sched_scan_interval
*= 2;
1164 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1165 wpa_s
->sched_scan_interval
= 10;
1166 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1170 /* If there is no more ssids, start next time from the beginning */
1172 wpa_s
->prev_sched_ssid
= NULL
;
1179 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1180 * @wpa_s: Pointer to wpa_supplicant data
1182 * This function is used to cancel a scan request scheduled with
1183 * wpa_supplicant_req_scan().
1185 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1187 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1188 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1193 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1194 * @wpa_s: Pointer to wpa_supplicant data
1196 * This function is used to stop a delayed scheduled scan.
1198 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1200 if (!wpa_s
->sched_scan_supported
)
1203 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1204 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1210 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1211 * @wpa_s: Pointer to wpa_supplicant data
1213 * This function is used to stop a periodic scheduled scan.
1215 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1217 if (!wpa_s
->sched_scanning
)
1220 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1221 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1222 wpa_supplicant_stop_sched_scan(wpa_s
);
1227 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1228 * @wpa_s: Pointer to wpa_supplicant data
1229 * @scanning: Whether scanning is currently in progress
1231 * This function is to generate scanning notifycations. It is called whenever
1232 * there may have been a change in scanning (scan started, completed, stopped).
1233 * wpas_notify_scanning() is called whenever the scanning state changed from the
1234 * previously notified state.
1236 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1239 if (wpa_s
->scanning
!= scanning
) {
1240 wpa_s
->scanning
= scanning
;
1241 wpas_notify_scanning(wpa_s
);
1246 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1252 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1253 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1254 if ((ie
[i
+ 2] & 0x7f) > rate
)
1255 rate
= ie
[i
+ 2] & 0x7f;
1258 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1259 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1260 if ((ie
[i
+ 2] & 0x7f) > rate
)
1261 rate
= ie
[i
+ 2] & 0x7f;
1269 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1270 * @res: Scan result entry
1271 * @ie: Information element identitifier (WLAN_EID_*)
1272 * Returns: Pointer to the information element (id field) or %NULL if not found
1274 * This function returns the first matching information element in the scan
1277 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1279 const u8
*end
, *pos
;
1281 pos
= (const u8
*) (res
+ 1);
1282 end
= pos
+ res
->ie_len
;
1284 while (pos
+ 1 < end
) {
1285 if (pos
+ 2 + pos
[1] > end
)
1297 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1298 * @res: Scan result entry
1299 * @vendor_type: Vendor type (four octets starting the IE payload)
1300 * Returns: Pointer to the information element (id field) or %NULL if not found
1302 * This function returns the first matching information element in the scan
1305 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1308 const u8
*end
, *pos
;
1310 pos
= (const u8
*) (res
+ 1);
1311 end
= pos
+ res
->ie_len
;
1313 while (pos
+ 1 < end
) {
1314 if (pos
+ 2 + pos
[1] > end
)
1316 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1317 vendor_type
== WPA_GET_BE32(&pos
[2]))
1327 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1328 * @res: Scan result entry
1329 * @vendor_type: Vendor type (four octets starting the IE payload)
1330 * Returns: Pointer to the information element (id field) or %NULL if not found
1332 * This function returns the first matching information element in the scan
1335 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1336 * from Beacon frames instead of either Beacon or Probe Response frames.
1338 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1341 const u8
*end
, *pos
;
1343 if (res
->beacon_ie_len
== 0)
1346 pos
= (const u8
*) (res
+ 1);
1348 end
= pos
+ res
->beacon_ie_len
;
1350 while (pos
+ 1 < end
) {
1351 if (pos
+ 2 + pos
[1] > end
)
1353 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1354 vendor_type
== WPA_GET_BE32(&pos
[2]))
1364 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1365 * @res: Scan result entry
1366 * @vendor_type: Vendor type (four octets starting the IE payload)
1367 * Returns: Pointer to the information element payload or %NULL if not found
1369 * This function returns concatenated payload of possibly fragmented vendor
1370 * specific information elements in the scan result. The caller is responsible
1371 * for freeing the returned buffer.
1373 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1377 const u8
*end
, *pos
;
1379 buf
= wpabuf_alloc(res
->ie_len
);
1383 pos
= (const u8
*) (res
+ 1);
1384 end
= pos
+ res
->ie_len
;
1386 while (pos
+ 1 < end
) {
1387 if (pos
+ 2 + pos
[1] > end
)
1389 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1390 vendor_type
== WPA_GET_BE32(&pos
[2]))
1391 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1395 if (wpabuf_len(buf
) == 0) {
1405 * Channels with a great SNR can operate at full rate. What is a great SNR?
1406 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1407 * rule of thumb is that any SNR above 20 is good." This one
1408 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1409 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1410 * conservative value.
1412 #define GREAT_SNR 30
1414 /* Compare function for sorting scan results. Return >0 if @b is considered
1416 static int wpa_scan_result_compar(const void *a
, const void *b
)
1418 #define IS_5GHZ(n) (n > 4000)
1419 #define MIN(a,b) a < b ? a : b
1420 struct wpa_scan_res
**_wa
= (void *) a
;
1421 struct wpa_scan_res
**_wb
= (void *) b
;
1422 struct wpa_scan_res
*wa
= *_wa
;
1423 struct wpa_scan_res
*wb
= *_wb
;
1424 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1427 /* WPA/WPA2 support preferred */
1428 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1429 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1430 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1431 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1433 if (wpa_b
&& !wpa_a
)
1435 if (!wpa_b
&& wpa_a
)
1438 /* privacy support preferred */
1439 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1440 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1442 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1443 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1446 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1447 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1448 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1449 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1451 /* Not suitable information to calculate SNR, so use level */
1456 /* best/max rate preferred if SNR close enough */
1457 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1458 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1459 maxrate_a
= wpa_scan_get_max_rate(wa
);
1460 maxrate_b
= wpa_scan_get_max_rate(wb
);
1461 if (maxrate_a
!= maxrate_b
)
1462 return maxrate_b
- maxrate_a
;
1463 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1464 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1467 /* use freq for channel preference */
1469 /* all things being equal, use SNR; if SNRs are
1470 * identical, use quality values since some drivers may only report
1471 * that value and leave the signal level zero */
1473 return wb
->qual
- wa
->qual
;
1474 return snr_b
- snr_a
;
1481 /* Compare function for sorting scan results when searching a WPS AP for
1482 * provisioning. Return >0 if @b is considered better. */
1483 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1485 struct wpa_scan_res
**_wa
= (void *) a
;
1486 struct wpa_scan_res
**_wb
= (void *) b
;
1487 struct wpa_scan_res
*wa
= *_wa
;
1488 struct wpa_scan_res
*wb
= *_wb
;
1489 int uses_wps_a
, uses_wps_b
;
1490 struct wpabuf
*wps_a
, *wps_b
;
1493 /* Optimization - check WPS IE existence before allocated memory and
1494 * doing full reassembly. */
1495 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1496 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1497 if (uses_wps_a
&& !uses_wps_b
)
1499 if (!uses_wps_a
&& uses_wps_b
)
1502 if (uses_wps_a
&& uses_wps_b
) {
1503 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1504 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1505 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1513 * Do not use current AP security policy as a sorting criteria during
1514 * WPS provisioning step since the AP may get reconfigured at the
1515 * completion of provisioning.
1518 /* all things being equal, use signal level; if signal levels are
1519 * identical, use quality values since some drivers may only report
1520 * that value and leave the signal level zero */
1521 if (wb
->level
== wa
->level
)
1522 return wb
->qual
- wa
->qual
;
1523 return wb
->level
- wa
->level
;
1525 #endif /* CONFIG_WPS */
1528 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1530 #ifndef CONFIG_NO_STDOUT_DEBUG
1533 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1536 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1538 for (i
= 0; i
< scan_res
->num
; i
++) {
1539 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1541 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1542 == WPA_SCAN_LEVEL_DBM
) {
1543 int snr
= r
->level
- r
->noise
;
1544 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1545 "noise=%d level=%d snr=%d%s flags=0x%x "
1547 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1548 r
->noise
, r
->level
, snr
,
1549 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1552 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1553 "noise=%d level=%d flags=0x%x age=%u",
1554 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1555 r
->noise
, r
->level
, r
->flags
, r
->age
);
1557 pos
= (u8
*) (r
+ 1);
1559 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1561 if (r
->beacon_ie_len
)
1562 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1563 pos
, r
->beacon_ie_len
);
1565 #endif /* CONFIG_NO_STDOUT_DEBUG */
1570 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1571 * @wpa_s: Pointer to wpa_supplicant data
1572 * @bssid: BSSID to check
1573 * Returns: 0 if the BSSID is filtered or 1 if not
1575 * This function is used to filter out specific BSSIDs from scan reslts mainly
1576 * for testing purposes (SET bssid_filter ctrl_iface command).
1578 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1583 if (wpa_s
->bssid_filter
== NULL
)
1586 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1587 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1596 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1597 struct wpa_scan_results
*res
)
1601 if (wpa_s
->bssid_filter
== NULL
)
1604 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1605 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1606 res
->res
[i
]->bssid
)) {
1607 res
->res
[j
++] = res
->res
[i
];
1609 os_free(res
->res
[i
]);
1614 if (res
->num
!= j
) {
1615 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1616 (int) (res
->num
- j
));
1623 * wpa_supplicant_get_scan_results - Get scan results
1624 * @wpa_s: Pointer to wpa_supplicant data
1625 * @info: Information about what was scanned or %NULL if not available
1626 * @new_scan: Whether a new scan was performed
1627 * Returns: Scan results, %NULL on failure
1629 * This function request the current scan results from the driver and updates
1630 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1631 * results with wpa_scan_results_free().
1633 struct wpa_scan_results
*
1634 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1635 struct scan_info
*info
, int new_scan
)
1637 struct wpa_scan_results
*scan_res
;
1639 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1641 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1642 if (scan_res
== NULL
) {
1643 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1646 if (scan_res
->fetch_time
.sec
== 0) {
1648 * Make sure we have a valid timestamp if the driver wrapper
1649 * does not set this.
1651 os_get_reltime(&scan_res
->fetch_time
);
1653 filter_scan_res(wpa_s
, scan_res
);
1656 if (wpas_wps_searching(wpa_s
)) {
1657 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1658 "provisioning rules");
1659 compar
= wpa_scan_result_wps_compar
;
1661 #endif /* CONFIG_WPS */
1663 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1665 dump_scan_res(scan_res
);
1667 wpa_bss_update_start(wpa_s
);
1668 for (i
= 0; i
< scan_res
->num
; i
++)
1669 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1670 &scan_res
->fetch_time
);
1671 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1678 * wpa_supplicant_update_scan_results - Update scan results from the driver
1679 * @wpa_s: Pointer to wpa_supplicant data
1680 * Returns: 0 on success, -1 on failure
1682 * This function updates the BSS table within wpa_supplicant based on the
1683 * currently available scan results from the driver without requesting a new
1684 * scan. This is used in cases where the driver indicates an association
1685 * (including roaming within ESS) and wpa_supplicant does not yet have the
1686 * needed information to complete the connection (e.g., to perform validation
1687 * steps in 4-way handshake).
1689 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1691 struct wpa_scan_results
*scan_res
;
1692 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1693 if (scan_res
== NULL
)
1695 wpa_scan_results_free(scan_res
);
1702 * scan_only_handler - Reports scan results
1704 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1705 struct wpa_scan_results
*scan_res
)
1707 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1708 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
1709 wpa_s
->manual_scan_use_id
&& wpa_s
->own_scan_running
) {
1710 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
"id=%u",
1711 wpa_s
->manual_scan_id
);
1712 wpa_s
->manual_scan_use_id
= 0;
1714 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1716 wpas_notify_scan_results(wpa_s
);
1717 wpas_notify_scan_done(wpa_s
, 1);
1718 if (wpa_s
->scan_work
) {
1719 struct wpa_radio_work
*work
= wpa_s
->scan_work
;
1720 wpa_s
->scan_work
= NULL
;
1721 radio_work_done(work
);
1726 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1728 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);
1732 struct wpa_driver_scan_params
*
1733 wpa_scan_clone_params(const struct wpa_driver_scan_params
*src
)
1735 struct wpa_driver_scan_params
*params
;
1739 params
= os_zalloc(sizeof(*params
));
1743 for (i
= 0; i
< src
->num_ssids
; i
++) {
1744 if (src
->ssids
[i
].ssid
) {
1745 n
= os_malloc(src
->ssids
[i
].ssid_len
);
1748 os_memcpy(n
, src
->ssids
[i
].ssid
,
1749 src
->ssids
[i
].ssid_len
);
1750 params
->ssids
[i
].ssid
= n
;
1751 params
->ssids
[i
].ssid_len
= src
->ssids
[i
].ssid_len
;
1754 params
->num_ssids
= src
->num_ssids
;
1756 if (src
->extra_ies
) {
1757 n
= os_malloc(src
->extra_ies_len
);
1760 os_memcpy(n
, src
->extra_ies
, src
->extra_ies_len
);
1761 params
->extra_ies
= n
;
1762 params
->extra_ies_len
= src
->extra_ies_len
;
1766 int len
= int_array_len(src
->freqs
);
1767 params
->freqs
= os_malloc((len
+ 1) * sizeof(int));
1768 if (params
->freqs
== NULL
)
1770 os_memcpy(params
->freqs
, src
->freqs
, (len
+ 1) * sizeof(int));
1773 if (src
->filter_ssids
) {
1774 params
->filter_ssids
= os_malloc(sizeof(*params
->filter_ssids
) *
1775 src
->num_filter_ssids
);
1776 if (params
->filter_ssids
== NULL
)
1778 os_memcpy(params
->filter_ssids
, src
->filter_ssids
,
1779 sizeof(*params
->filter_ssids
) *
1780 src
->num_filter_ssids
);
1781 params
->num_filter_ssids
= src
->num_filter_ssids
;
1784 params
->filter_rssi
= src
->filter_rssi
;
1785 params
->p2p_probe
= src
->p2p_probe
;
1786 params
->only_new_results
= src
->only_new_results
;
1791 wpa_scan_free_params(params
);
1796 void wpa_scan_free_params(struct wpa_driver_scan_params
*params
)
1803 for (i
= 0; i
< params
->num_ssids
; i
++)
1804 os_free((u8
*) params
->ssids
[i
].ssid
);
1805 os_free((u8
*) params
->extra_ies
);
1806 os_free(params
->freqs
);
1807 os_free(params
->filter_ssids
);