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
++;
330 if (params
->freqs
== NULL
&& wpa_s
->p2p_in_invitation
) {
332 * Optimize scan based on GO information during persistent
335 if (wpa_s
->p2p_in_invitation
< 5 &&
336 wpa_s
->p2p_invite_go_freq
> 0) {
337 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Scan only GO preferred frequency %d MHz during invitation",
338 wpa_s
->p2p_invite_go_freq
);
339 params
->freqs
= os_zalloc(2 * sizeof(int));
341 params
->freqs
[0] = wpa_s
->p2p_invite_go_freq
;
343 wpa_s
->p2p_in_invitation
++;
344 if (wpa_s
->p2p_in_invitation
> 20) {
346 * This should not really happen since the variable is
347 * cleared on group removal, but if it does happen, make
348 * sure we do not get stuck in special invitation scan
351 wpa_dbg(wpa_s
, MSG_DEBUG
, "P2P: Clear p2p_in_invitation");
352 wpa_s
->p2p_in_invitation
= 0;
355 #endif /* CONFIG_P2P */
358 if (params
->freqs
== NULL
&& wpa_s
->after_wps
&& wpa_s
->wps_freq
) {
360 * Optimize post-provisioning scan based on channel used
361 * during provisioning.
363 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz "
364 "that was used during provisioning", wpa_s
->wps_freq
);
365 params
->freqs
= os_zalloc(2 * sizeof(int));
367 params
->freqs
[0] = wpa_s
->wps_freq
;
369 } else if (wpa_s
->after_wps
)
372 if (params
->freqs
== NULL
&& wpa_s
->known_wps_freq
&& wpa_s
->wps_freq
)
374 /* Optimize provisioning scan based on already known channel */
375 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Scan only frequency %u MHz",
377 params
->freqs
= os_zalloc(2 * sizeof(int));
379 params
->freqs
[0] = wpa_s
->wps_freq
;
380 wpa_s
->known_wps_freq
= 0; /* only do this once */
382 #endif /* CONFIG_WPS */
386 #ifdef CONFIG_INTERWORKING
387 static void wpas_add_interworking_elements(struct wpa_supplicant
*wpa_s
,
390 if (wpa_s
->conf
->interworking
== 0)
393 wpabuf_put_u8(buf
, WLAN_EID_EXT_CAPAB
);
394 wpabuf_put_u8(buf
, 6);
395 wpabuf_put_u8(buf
, 0x00);
396 wpabuf_put_u8(buf
, 0x00);
397 wpabuf_put_u8(buf
, 0x00);
398 wpabuf_put_u8(buf
, 0x80); /* Bit 31 - Interworking */
399 wpabuf_put_u8(buf
, 0x00);
401 wpabuf_put_u8(buf
, 0x40); /* Bit 46 - WNM-Notification */
402 #else /* CONFIG_HS20 */
403 wpabuf_put_u8(buf
, 0x00);
404 #endif /* CONFIG_HS20 */
406 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
407 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
409 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
411 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
412 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
414 #endif /* CONFIG_INTERWORKING */
417 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
419 struct wpabuf
*extra_ie
= NULL
;
422 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
423 #endif /* CONFIG_WPS */
425 #ifdef CONFIG_INTERWORKING
426 if (wpa_s
->conf
->interworking
&&
427 wpabuf_resize(&extra_ie
, 100) == 0)
428 wpas_add_interworking_elements(wpa_s
, extra_ie
);
429 #endif /* CONFIG_INTERWORKING */
432 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
435 struct wpabuf
*wps_ie
;
436 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
439 wpa_s
->wps
->uuid
, req_type
,
442 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
443 wpabuf_put_buf(extra_ie
, wps_ie
);
450 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
451 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
452 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
454 #endif /* CONFIG_P2P */
456 #endif /* CONFIG_WPS */
459 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
460 wpas_hs20_add_indication(extra_ie
, -1);
461 #endif /* CONFIG_HS20 */
470 * Check whether there are any enabled networks or credentials that could be
471 * used for a non-P2P connection.
473 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
475 struct wpa_ssid
*ssid
;
477 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
478 if (wpas_network_disabled(wpa_s
, ssid
))
480 if (!ssid
->p2p_group
)
484 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
485 wpa_s
->conf
->auto_interworking
)
491 #endif /* CONFIG_P2P */
494 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
496 enum hostapd_hw_mode mode
)
500 for (i
= 0; i
< num_modes
; i
++) {
501 if (modes
[i
].mode
== mode
)
509 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
510 enum hostapd_hw_mode band
,
511 struct wpa_driver_scan_params
*params
)
513 /* Include only supported channels for the specified band */
514 struct hostapd_hw_modes
*mode
;
517 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
519 /* No channels supported in this band - use empty list */
520 params
->freqs
= os_zalloc(sizeof(int));
524 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
525 if (params
->freqs
== NULL
)
527 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
528 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
530 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
535 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
536 struct wpa_driver_scan_params
*params
)
538 if (wpa_s
->hw
.modes
== NULL
)
539 return; /* unknown what channels the driver supports */
541 return; /* already using a limited channel set */
542 if (wpa_s
->setband
== WPA_SETBAND_5G
)
543 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
545 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
546 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
551 static void wpa_set_scan_ssids(struct wpa_supplicant
*wpa_s
,
552 struct wpa_driver_scan_params
*params
,
556 struct wpa_ssid
*ssid
;
558 for (i
= 0; i
< wpa_s
->scan_id_count
; i
++) {
561 ssid
= wpa_config_get_network(wpa_s
->conf
, wpa_s
->scan_id
[i
]);
562 if (!ssid
|| !ssid
->scan_ssid
)
565 for (j
= 0; j
< params
->num_ssids
; j
++) {
566 if (params
->ssids
[j
].ssid_len
== ssid
->ssid_len
&&
567 params
->ssids
[j
].ssid
&&
568 os_memcmp(params
->ssids
[j
].ssid
, ssid
->ssid
,
569 ssid
->ssid_len
) == 0)
572 if (j
< params
->num_ssids
)
573 continue; /* already in the list */
575 if (params
->num_ssids
+ 1 > max_ssids
) {
576 wpa_printf(MSG_DEBUG
,
577 "Over max scan SSIDs for manual request");
581 wpa_printf(MSG_DEBUG
, "Scan SSID (manual request): %s",
582 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
583 params
->ssids
[params
->num_ssids
].ssid
= ssid
->ssid
;
584 params
->ssids
[params
->num_ssids
].ssid_len
= ssid
->ssid_len
;
588 wpa_s
->scan_id_count
= 0;
592 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
594 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
595 struct wpa_ssid
*ssid
;
597 struct wpabuf
*extra_ie
= NULL
;
598 struct wpa_driver_scan_params params
;
599 struct wpa_driver_scan_params
*scan_params
;
601 enum wpa_states prev_state
;
603 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
) {
604 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - PNO is in progress");
608 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
609 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
613 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
614 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
615 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
619 if (wpa_s
->scanning
) {
621 * If we are already in scanning state, we shall reschedule the
622 * the incoming scan request.
624 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
625 wpa_supplicant_req_scan(wpa_s
, 1, 0);
629 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
630 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
631 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
632 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
636 if (wpa_s
->conf
->ap_scan
!= 0 &&
637 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
638 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
639 "overriding ap_scan configuration");
640 wpa_s
->conf
->ap_scan
= 0;
641 wpas_notify_ap_scan_changed(wpa_s
);
644 if (wpa_s
->conf
->ap_scan
== 0) {
645 wpa_supplicant_gen_assoc_event(wpa_s
);
649 if (wpas_p2p_in_progress(wpa_s
)) {
650 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan while P2P operation is in progress");
651 wpa_supplicant_req_scan(wpa_s
, 5, 0);
655 if (wpa_s
->conf
->ap_scan
== 2)
658 max_ssids
= wpa_s
->max_scan_ssids
;
659 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
660 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
663 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
664 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
666 os_memset(¶ms
, 0, sizeof(params
));
668 prev_state
= wpa_s
->wpa_state
;
669 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
670 wpa_s
->wpa_state
== WPA_INACTIVE
)
671 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
674 * If autoscan has set its own scanning parameters
676 if (wpa_s
->autoscan_params
!= NULL
) {
677 scan_params
= wpa_s
->autoscan_params
;
681 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
682 wpa_s
->connect_without_scan
) {
683 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
684 if (ssid
== wpa_s
->connect_without_scan
)
687 wpa_s
->connect_without_scan
= NULL
;
689 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
690 "without scan step");
691 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
697 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
699 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
700 wpa_s
->p2p_in_provisioning
,
701 wpa_s
->show_group_started
);
702 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
703 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
704 params
.num_ssids
= 1;
708 if (wpa_s
->p2p_in_invitation
) {
709 if (wpa_s
->current_ssid
) {
710 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during invitation");
711 params
.ssids
[0].ssid
= wpa_s
->current_ssid
->ssid
;
712 params
.ssids
[0].ssid_len
=
713 wpa_s
->current_ssid
->ssid_len
;
714 params
.num_ssids
= 1;
716 wpa_printf(MSG_DEBUG
, "P2P: No specific SSID known for scan during invitation");
720 #endif /* CONFIG_P2P */
722 /* Find the starting point from which to continue scanning */
723 ssid
= wpa_s
->conf
->ssid
;
724 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
726 if (ssid
== wpa_s
->prev_scan_ssid
) {
734 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
735 wpa_s
->conf
->ap_scan
== 2) {
736 wpa_s
->connect_without_scan
= NULL
;
737 wpa_s
->prev_scan_wildcard
= 0;
738 wpa_supplicant_assoc_try(wpa_s
, ssid
);
740 } else if (wpa_s
->conf
->ap_scan
== 2) {
742 * User-initiated scan request in ap_scan == 2; scan with
746 } else if (wpa_s
->reattach
&& wpa_s
->current_ssid
!= NULL
) {
748 * Perform single-channel single-SSID scan for
749 * reassociate-to-same-BSS operation.
752 ssid
= wpa_s
->current_ssid
;
753 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
754 ssid
->ssid
, ssid
->ssid_len
);
755 params
.ssids
[0].ssid
= ssid
->ssid
;
756 params
.ssids
[0].ssid_len
= ssid
->ssid_len
;
757 params
.num_ssids
= 1;
760 * Allocate memory for frequency array, allocate one extra
761 * slot for the zero-terminator.
763 params
.freqs
= os_malloc(sizeof(int) * 2);
764 if (params
.freqs
== NULL
) {
765 wpa_dbg(wpa_s
, MSG_ERROR
, "Memory allocation failed");
768 params
.freqs
[0] = wpa_s
->assoc_freq
;
772 * Reset the reattach flag so that we fall back to full scan if
777 struct wpa_ssid
*start
= ssid
, *tssid
;
779 if (ssid
== NULL
&& max_ssids
> 1)
780 ssid
= wpa_s
->conf
->ssid
;
782 if (!wpas_network_disabled(wpa_s
, ssid
) &&
784 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
785 ssid
->ssid
, ssid
->ssid_len
);
786 params
.ssids
[params
.num_ssids
].ssid
=
788 params
.ssids
[params
.num_ssids
].ssid_len
=
791 if (params
.num_ssids
+ 1 >= max_ssids
)
797 if (ssid
== NULL
&& max_ssids
> 1 &&
798 start
!= wpa_s
->conf
->ssid
)
799 ssid
= wpa_s
->conf
->ssid
;
802 if (wpa_s
->scan_id_count
&&
803 wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
)
804 wpa_set_scan_ssids(wpa_s
, ¶ms
, max_ssids
);
806 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
807 if (wpas_network_disabled(wpa_s
, tssid
))
809 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
810 int_array_concat(¶ms
.freqs
,
813 os_free(params
.freqs
);
818 int_array_sort_unique(params
.freqs
);
821 if (ssid
&& max_ssids
== 1) {
823 * If the driver is limited to 1 SSID at a time interleave
824 * wildcard SSID scans with specific SSID scans to avoid
825 * waiting a long time for a wildcard scan.
827 if (!wpa_s
->prev_scan_wildcard
) {
828 params
.ssids
[0].ssid
= NULL
;
829 params
.ssids
[0].ssid_len
= 0;
830 wpa_s
->prev_scan_wildcard
= 1;
831 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
832 "wildcard SSID (Interleave with specific)");
834 wpa_s
->prev_scan_ssid
= ssid
;
835 wpa_s
->prev_scan_wildcard
= 0;
836 wpa_dbg(wpa_s
, MSG_DEBUG
,
837 "Starting AP scan for specific SSID: %s",
838 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
843 wpa_s
->prev_scan_ssid
= ssid
;
844 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
847 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
848 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
849 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
851 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
853 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
858 #endif /* CONFIG_P2P */
860 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
861 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
863 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
864 wpa_s
->manual_scan_only_new
)
865 params
.only_new_results
= 1;
867 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
868 wpa_s
->manual_scan_freqs
) {
869 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
870 params
.freqs
= wpa_s
->manual_scan_freqs
;
871 wpa_s
->manual_scan_freqs
= NULL
;
874 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
875 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
876 "generated frequency list");
877 params
.freqs
= wpa_s
->next_scan_freqs
;
879 os_free(wpa_s
->next_scan_freqs
);
880 wpa_s
->next_scan_freqs
= NULL
;
881 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
883 /* See if user specified frequencies. If so, scan only those. */
884 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
885 wpa_dbg(wpa_s
, MSG_DEBUG
,
886 "Optimize scan based on conf->freq_list");
887 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
890 /* Use current associated channel? */
891 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
892 unsigned int num
= wpa_s
->num_multichan_concurrent
;
894 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
896 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
898 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
899 "current operating channels since "
900 "scan_cur_freq is enabled");
902 os_free(params
.freqs
);
908 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
909 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
911 params
.extra_ies
= wpabuf_head(extra_ie
);
912 params
.extra_ies_len
= wpabuf_len(extra_ie
);
916 if (wpa_s
->p2p_in_provisioning
|| wpa_s
->p2p_in_invitation
||
917 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
919 * The interface may not yet be in P2P mode, so we have to
920 * explicitly request P2P probe to disable CCK rates.
922 params
.p2p_probe
= 1;
924 #endif /* CONFIG_P2P */
926 scan_params
= ¶ms
;
931 * If the driver does not support multi-channel concurrency and a
932 * virtual interface that shares the same radio with the wpa_s interface
933 * is operating there may not be need to scan other channels apart from
934 * the current operating channel on the other virtual interface. Filter
935 * out other channels in case we are trying to find a connection for a
936 * station interface when we are not configured to prefer station
937 * connection and a concurrent operation is already in process.
939 if (wpa_s
->scan_for_connection
&&
940 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
941 !scan_params
->freqs
&& !params
.freqs
&&
942 wpas_is_p2p_prioritized(wpa_s
) &&
943 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
944 non_p2p_network_enabled(wpa_s
)) {
945 unsigned int num
= wpa_s
->num_multichan_concurrent
;
947 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
949 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
950 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
951 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
953 os_free(params
.freqs
);
958 #endif /* CONFIG_P2P */
960 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
962 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
963 !wpa_s
->manual_scan_freqs
) {
964 /* Restore manual_scan_freqs for the next attempt */
965 wpa_s
->manual_scan_freqs
= params
.freqs
;
969 wpabuf_free(extra_ie
);
970 os_free(params
.freqs
);
971 os_free(params
.filter_ssids
);
974 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
975 if (prev_state
!= wpa_s
->wpa_state
)
976 wpa_supplicant_set_state(wpa_s
, prev_state
);
977 /* Restore scan_req since we will try to scan again */
978 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
979 wpa_supplicant_req_scan(wpa_s
, 1, 0);
981 wpa_s
->scan_for_connection
= 0;
986 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
988 struct os_reltime remaining
, new_int
;
991 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
996 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
997 new_int
.sec
= remaining
.sec
;
998 new_int
.usec
= remaining
.usec
;
1002 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
1003 wpa_supplicant_scan
, wpa_s
, NULL
);
1005 wpa_s
->scan_interval
= sec
;
1010 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
1011 * @wpa_s: Pointer to wpa_supplicant data
1012 * @sec: Number of seconds after which to scan
1013 * @usec: Number of microseconds after which to scan
1015 * This function is used to schedule a scan for neighboring access points after
1016 * the specified time.
1018 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
1020 int res
= eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
,
1023 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d.%06d sec",
1025 } else if (res
== 0) {
1026 wpa_dbg(wpa_s
, MSG_DEBUG
, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
1029 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d.%06d sec",
1031 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
1037 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
1038 * @wpa_s: Pointer to wpa_supplicant data
1039 * @sec: Number of seconds after which to scan
1040 * @usec: Number of microseconds after which to scan
1041 * Returns: 0 on success or -1 otherwise
1043 * This function is used to schedule periodic scans for neighboring
1044 * access points after the specified time.
1046 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
1049 if (!wpa_s
->sched_scan_supported
)
1052 eloop_register_timeout(sec
, usec
,
1053 wpa_supplicant_delayed_sched_scan_timeout
,
1061 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
1062 * @wpa_s: Pointer to wpa_supplicant data
1063 * Returns: 0 is sched_scan was started or -1 otherwise
1065 * This function is used to schedule periodic scans for neighboring
1066 * access points repeating the scan continuously.
1068 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
1070 struct wpa_driver_scan_params params
;
1071 struct wpa_driver_scan_params
*scan_params
;
1072 enum wpa_states prev_state
;
1073 struct wpa_ssid
*ssid
= NULL
;
1074 struct wpabuf
*extra_ie
= NULL
;
1076 unsigned int max_sched_scan_ssids
;
1080 if (!wpa_s
->sched_scan_supported
)
1083 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
1084 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
1086 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
1087 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
1090 if (wpa_s
->sched_scanning
) {
1091 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
1096 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
1097 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
1098 /* Use wildcard SSID to find this network */
1100 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
1105 if (!wpas_network_disabled(wpa_s
, ssid
) &&
1106 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
1108 * Normal scan is more reliable and faster for WPS
1109 * operations and since these are for short periods of
1110 * time, the benefit of trying to use sched_scan would
1113 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1114 "sched_scan for WPS");
1117 #endif /* CONFIG_WPS */
1122 if (wpa_s
->normal_scans
< 3 &&
1123 (need_ssids
<= wpa_s
->max_scan_ssids
||
1124 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
1126 * When normal scan can speed up operations, use that for the
1127 * first operations before starting the sched_scan to allow
1128 * user space sleep more. We do this only if the normal scan
1129 * has functionality that is suitable for this or if the
1130 * sched_scan does not have better support for multiple SSIDs.
1132 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1133 "sched_scan for initial scans (normal_scans=%d)",
1134 wpa_s
->normal_scans
);
1138 os_memset(¶ms
, 0, sizeof(params
));
1140 /* If we can't allocate space for the filters, we just don't filter */
1141 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
1142 sizeof(struct wpa_driver_scan_filter
));
1144 prev_state
= wpa_s
->wpa_state
;
1145 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1146 wpa_s
->wpa_state
== WPA_INACTIVE
)
1147 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1149 if (wpa_s
->autoscan_params
!= NULL
) {
1150 scan_params
= wpa_s
->autoscan_params
;
1154 /* Find the starting point from which to continue scanning */
1155 ssid
= wpa_s
->conf
->ssid
;
1156 if (wpa_s
->prev_sched_ssid
) {
1158 if (ssid
== wpa_s
->prev_sched_ssid
) {
1166 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1167 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1168 if (wpa_s
->conf
->sched_scan_interval
)
1169 wpa_s
->sched_scan_interval
=
1170 wpa_s
->conf
->sched_scan_interval
;
1171 if (wpa_s
->sched_scan_interval
== 0)
1172 wpa_s
->sched_scan_interval
= 10;
1173 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1174 wpa_s
->first_sched_scan
= 1;
1175 ssid
= wpa_s
->conf
->ssid
;
1176 wpa_s
->prev_sched_ssid
= ssid
;
1180 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1185 if (wpas_network_disabled(wpa_s
, ssid
))
1188 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1189 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1190 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1191 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1192 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1193 ssid
->ssid
, ssid
->ssid_len
);
1194 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1196 params
.num_filter_ssids
++;
1197 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1199 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1200 "filter for sched_scan - drop filter");
1201 os_free(params
.filter_ssids
);
1202 params
.filter_ssids
= NULL
;
1203 params
.num_filter_ssids
= 0;
1206 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1207 if (params
.num_ssids
== max_sched_scan_ssids
)
1208 break; /* only room for broadcast SSID */
1209 wpa_dbg(wpa_s
, MSG_DEBUG
,
1210 "add to active scan ssid: %s",
1211 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1212 params
.ssids
[params
.num_ssids
].ssid
=
1214 params
.ssids
[params
.num_ssids
].ssid_len
=
1217 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1218 wpa_s
->prev_sched_ssid
= ssid
;
1222 (wpas_network_disabled(wpa_s
, ssid
) ||
1229 wpa_s
->prev_sched_ssid
= ssid
;
1233 if (params
.num_filter_ssids
== 0) {
1234 os_free(params
.filter_ssids
);
1235 params
.filter_ssids
= NULL
;
1238 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1240 params
.extra_ies
= wpabuf_head(extra_ie
);
1241 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1244 if (wpa_s
->conf
->filter_rssi
)
1245 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
1247 scan_params
= ¶ms
;
1250 if (ssid
|| !wpa_s
->first_sched_scan
) {
1251 wpa_dbg(wpa_s
, MSG_DEBUG
,
1252 "Starting sched scan: interval %d timeout %d",
1253 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1255 wpa_dbg(wpa_s
, MSG_DEBUG
,
1256 "Starting sched scan: interval %d (no timeout)",
1257 wpa_s
->sched_scan_interval
);
1260 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1262 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1263 wpa_s
->sched_scan_interval
);
1264 wpabuf_free(extra_ie
);
1265 os_free(params
.filter_ssids
);
1267 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1268 if (prev_state
!= wpa_s
->wpa_state
)
1269 wpa_supplicant_set_state(wpa_s
, prev_state
);
1273 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1274 if (ssid
|| !wpa_s
->first_sched_scan
) {
1275 wpa_s
->sched_scan_timed_out
= 0;
1276 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1277 wpa_supplicant_sched_scan_timeout
,
1279 wpa_s
->first_sched_scan
= 0;
1280 wpa_s
->sched_scan_timeout
/= 2;
1281 wpa_s
->sched_scan_interval
*= 2;
1282 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1283 wpa_s
->sched_scan_interval
= 10;
1284 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1288 /* If there is no more ssids, start next time from the beginning */
1290 wpa_s
->prev_sched_ssid
= NULL
;
1297 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1298 * @wpa_s: Pointer to wpa_supplicant data
1300 * This function is used to cancel a scan request scheduled with
1301 * wpa_supplicant_req_scan().
1303 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1305 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1306 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1311 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1312 * @wpa_s: Pointer to wpa_supplicant data
1314 * This function is used to stop a delayed scheduled scan.
1316 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1318 if (!wpa_s
->sched_scan_supported
)
1321 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1322 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1328 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1329 * @wpa_s: Pointer to wpa_supplicant data
1331 * This function is used to stop a periodic scheduled scan.
1333 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1335 if (!wpa_s
->sched_scanning
)
1338 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1339 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1340 wpa_supplicant_stop_sched_scan(wpa_s
);
1345 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1346 * @wpa_s: Pointer to wpa_supplicant data
1347 * @scanning: Whether scanning is currently in progress
1349 * This function is to generate scanning notifycations. It is called whenever
1350 * there may have been a change in scanning (scan started, completed, stopped).
1351 * wpas_notify_scanning() is called whenever the scanning state changed from the
1352 * previously notified state.
1354 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1357 if (wpa_s
->scanning
!= scanning
) {
1358 wpa_s
->scanning
= scanning
;
1359 wpas_notify_scanning(wpa_s
);
1364 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1370 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1371 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1372 if ((ie
[i
+ 2] & 0x7f) > rate
)
1373 rate
= ie
[i
+ 2] & 0x7f;
1376 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1377 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1378 if ((ie
[i
+ 2] & 0x7f) > rate
)
1379 rate
= ie
[i
+ 2] & 0x7f;
1387 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1388 * @res: Scan result entry
1389 * @ie: Information element identitifier (WLAN_EID_*)
1390 * Returns: Pointer to the information element (id field) or %NULL if not found
1392 * This function returns the first matching information element in the scan
1395 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1397 const u8
*end
, *pos
;
1399 pos
= (const u8
*) (res
+ 1);
1400 end
= pos
+ res
->ie_len
;
1402 while (pos
+ 1 < end
) {
1403 if (pos
+ 2 + pos
[1] > end
)
1415 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1416 * @res: Scan result entry
1417 * @vendor_type: Vendor type (four octets starting the IE payload)
1418 * Returns: Pointer to the information element (id field) or %NULL if not found
1420 * This function returns the first matching information element in the scan
1423 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1426 const u8
*end
, *pos
;
1428 pos
= (const u8
*) (res
+ 1);
1429 end
= pos
+ res
->ie_len
;
1431 while (pos
+ 1 < end
) {
1432 if (pos
+ 2 + pos
[1] > end
)
1434 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1435 vendor_type
== WPA_GET_BE32(&pos
[2]))
1445 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1446 * @res: Scan result entry
1447 * @vendor_type: Vendor type (four octets starting the IE payload)
1448 * Returns: Pointer to the information element (id field) or %NULL if not found
1450 * This function returns the first matching information element in the scan
1453 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1454 * from Beacon frames instead of either Beacon or Probe Response frames.
1456 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1459 const u8
*end
, *pos
;
1461 if (res
->beacon_ie_len
== 0)
1464 pos
= (const u8
*) (res
+ 1);
1466 end
= pos
+ res
->beacon_ie_len
;
1468 while (pos
+ 1 < end
) {
1469 if (pos
+ 2 + pos
[1] > end
)
1471 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1472 vendor_type
== WPA_GET_BE32(&pos
[2]))
1482 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1483 * @res: Scan result entry
1484 * @vendor_type: Vendor type (four octets starting the IE payload)
1485 * Returns: Pointer to the information element payload or %NULL if not found
1487 * This function returns concatenated payload of possibly fragmented vendor
1488 * specific information elements in the scan result. The caller is responsible
1489 * for freeing the returned buffer.
1491 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1495 const u8
*end
, *pos
;
1497 buf
= wpabuf_alloc(res
->ie_len
);
1501 pos
= (const u8
*) (res
+ 1);
1502 end
= pos
+ res
->ie_len
;
1504 while (pos
+ 1 < end
) {
1505 if (pos
+ 2 + pos
[1] > end
)
1507 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1508 vendor_type
== WPA_GET_BE32(&pos
[2]))
1509 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1513 if (wpabuf_len(buf
) == 0) {
1523 * Channels with a great SNR can operate at full rate. What is a great SNR?
1524 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1525 * rule of thumb is that any SNR above 20 is good." This one
1526 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1527 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1528 * conservative value.
1530 #define GREAT_SNR 30
1532 /* Compare function for sorting scan results. Return >0 if @b is considered
1534 static int wpa_scan_result_compar(const void *a
, const void *b
)
1536 #define IS_5GHZ(n) (n > 4000)
1537 #define MIN(a,b) a < b ? a : b
1538 struct wpa_scan_res
**_wa
= (void *) a
;
1539 struct wpa_scan_res
**_wb
= (void *) b
;
1540 struct wpa_scan_res
*wa
= *_wa
;
1541 struct wpa_scan_res
*wb
= *_wb
;
1542 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1545 /* WPA/WPA2 support preferred */
1546 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1547 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1548 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1549 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1551 if (wpa_b
&& !wpa_a
)
1553 if (!wpa_b
&& wpa_a
)
1556 /* privacy support preferred */
1557 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1558 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1560 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1561 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1564 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1565 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1566 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1567 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1569 /* Not suitable information to calculate SNR, so use level */
1574 /* best/max rate preferred if SNR close enough */
1575 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1576 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1577 maxrate_a
= wpa_scan_get_max_rate(wa
);
1578 maxrate_b
= wpa_scan_get_max_rate(wb
);
1579 if (maxrate_a
!= maxrate_b
)
1580 return maxrate_b
- maxrate_a
;
1581 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1582 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1585 /* use freq for channel preference */
1587 /* all things being equal, use SNR; if SNRs are
1588 * identical, use quality values since some drivers may only report
1589 * that value and leave the signal level zero */
1591 return wb
->qual
- wa
->qual
;
1592 return snr_b
- snr_a
;
1599 /* Compare function for sorting scan results when searching a WPS AP for
1600 * provisioning. Return >0 if @b is considered better. */
1601 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1603 struct wpa_scan_res
**_wa
= (void *) a
;
1604 struct wpa_scan_res
**_wb
= (void *) b
;
1605 struct wpa_scan_res
*wa
= *_wa
;
1606 struct wpa_scan_res
*wb
= *_wb
;
1607 int uses_wps_a
, uses_wps_b
;
1608 struct wpabuf
*wps_a
, *wps_b
;
1611 /* Optimization - check WPS IE existence before allocated memory and
1612 * doing full reassembly. */
1613 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1614 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1615 if (uses_wps_a
&& !uses_wps_b
)
1617 if (!uses_wps_a
&& uses_wps_b
)
1620 if (uses_wps_a
&& uses_wps_b
) {
1621 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1622 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1623 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1631 * Do not use current AP security policy as a sorting criteria during
1632 * WPS provisioning step since the AP may get reconfigured at the
1633 * completion of provisioning.
1636 /* all things being equal, use signal level; if signal levels are
1637 * identical, use quality values since some drivers may only report
1638 * that value and leave the signal level zero */
1639 if (wb
->level
== wa
->level
)
1640 return wb
->qual
- wa
->qual
;
1641 return wb
->level
- wa
->level
;
1643 #endif /* CONFIG_WPS */
1646 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1648 #ifndef CONFIG_NO_STDOUT_DEBUG
1651 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1654 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1656 for (i
= 0; i
< scan_res
->num
; i
++) {
1657 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1659 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1660 == WPA_SCAN_LEVEL_DBM
) {
1661 int snr
= r
->level
- r
->noise
;
1662 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1663 "noise=%d level=%d snr=%d%s flags=0x%x "
1665 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1666 r
->noise
, r
->level
, snr
,
1667 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1670 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1671 "noise=%d level=%d flags=0x%x age=%u",
1672 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1673 r
->noise
, r
->level
, r
->flags
, r
->age
);
1675 pos
= (u8
*) (r
+ 1);
1677 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1679 if (r
->beacon_ie_len
)
1680 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1681 pos
, r
->beacon_ie_len
);
1683 #endif /* CONFIG_NO_STDOUT_DEBUG */
1688 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1689 * @wpa_s: Pointer to wpa_supplicant data
1690 * @bssid: BSSID to check
1691 * Returns: 0 if the BSSID is filtered or 1 if not
1693 * This function is used to filter out specific BSSIDs from scan reslts mainly
1694 * for testing purposes (SET bssid_filter ctrl_iface command).
1696 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1701 if (wpa_s
->bssid_filter
== NULL
)
1704 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1705 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1714 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1715 struct wpa_scan_results
*res
)
1719 if (wpa_s
->bssid_filter
== NULL
)
1722 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1723 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1724 res
->res
[i
]->bssid
)) {
1725 res
->res
[j
++] = res
->res
[i
];
1727 os_free(res
->res
[i
]);
1732 if (res
->num
!= j
) {
1733 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1734 (int) (res
->num
- j
));
1741 * wpa_supplicant_get_scan_results - Get scan results
1742 * @wpa_s: Pointer to wpa_supplicant data
1743 * @info: Information about what was scanned or %NULL if not available
1744 * @new_scan: Whether a new scan was performed
1745 * Returns: Scan results, %NULL on failure
1747 * This function request the current scan results from the driver and updates
1748 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1749 * results with wpa_scan_results_free().
1751 struct wpa_scan_results
*
1752 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1753 struct scan_info
*info
, int new_scan
)
1755 struct wpa_scan_results
*scan_res
;
1757 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1759 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1760 if (scan_res
== NULL
) {
1761 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1764 if (scan_res
->fetch_time
.sec
== 0) {
1766 * Make sure we have a valid timestamp if the driver wrapper
1767 * does not set this.
1769 os_get_reltime(&scan_res
->fetch_time
);
1771 filter_scan_res(wpa_s
, scan_res
);
1774 if (wpas_wps_searching(wpa_s
)) {
1775 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1776 "provisioning rules");
1777 compar
= wpa_scan_result_wps_compar
;
1779 #endif /* CONFIG_WPS */
1781 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1783 dump_scan_res(scan_res
);
1785 wpa_bss_update_start(wpa_s
);
1786 for (i
= 0; i
< scan_res
->num
; i
++)
1787 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1788 &scan_res
->fetch_time
);
1789 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1796 * wpa_supplicant_update_scan_results - Update scan results from the driver
1797 * @wpa_s: Pointer to wpa_supplicant data
1798 * Returns: 0 on success, -1 on failure
1800 * This function updates the BSS table within wpa_supplicant based on the
1801 * currently available scan results from the driver without requesting a new
1802 * scan. This is used in cases where the driver indicates an association
1803 * (including roaming within ESS) and wpa_supplicant does not yet have the
1804 * needed information to complete the connection (e.g., to perform validation
1805 * steps in 4-way handshake).
1807 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1809 struct wpa_scan_results
*scan_res
;
1810 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1811 if (scan_res
== NULL
)
1813 wpa_scan_results_free(scan_res
);
1820 * scan_only_handler - Reports scan results
1822 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1823 struct wpa_scan_results
*scan_res
)
1825 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1826 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
1827 wpa_s
->manual_scan_use_id
&& wpa_s
->own_scan_running
) {
1828 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
"id=%u",
1829 wpa_s
->manual_scan_id
);
1830 wpa_s
->manual_scan_use_id
= 0;
1832 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1834 wpas_notify_scan_results(wpa_s
);
1835 wpas_notify_scan_done(wpa_s
, 1);
1836 if (wpa_s
->scan_work
) {
1837 struct wpa_radio_work
*work
= wpa_s
->scan_work
;
1838 wpa_s
->scan_work
= NULL
;
1839 radio_work_done(work
);
1844 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1846 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);
1850 struct wpa_driver_scan_params
*
1851 wpa_scan_clone_params(const struct wpa_driver_scan_params
*src
)
1853 struct wpa_driver_scan_params
*params
;
1857 params
= os_zalloc(sizeof(*params
));
1861 for (i
= 0; i
< src
->num_ssids
; i
++) {
1862 if (src
->ssids
[i
].ssid
) {
1863 n
= os_malloc(src
->ssids
[i
].ssid_len
);
1866 os_memcpy(n
, src
->ssids
[i
].ssid
,
1867 src
->ssids
[i
].ssid_len
);
1868 params
->ssids
[i
].ssid
= n
;
1869 params
->ssids
[i
].ssid_len
= src
->ssids
[i
].ssid_len
;
1872 params
->num_ssids
= src
->num_ssids
;
1874 if (src
->extra_ies
) {
1875 n
= os_malloc(src
->extra_ies_len
);
1878 os_memcpy(n
, src
->extra_ies
, src
->extra_ies_len
);
1879 params
->extra_ies
= n
;
1880 params
->extra_ies_len
= src
->extra_ies_len
;
1884 int len
= int_array_len(src
->freqs
);
1885 params
->freqs
= os_malloc((len
+ 1) * sizeof(int));
1886 if (params
->freqs
== NULL
)
1888 os_memcpy(params
->freqs
, src
->freqs
, (len
+ 1) * sizeof(int));
1891 if (src
->filter_ssids
) {
1892 params
->filter_ssids
= os_malloc(sizeof(*params
->filter_ssids
) *
1893 src
->num_filter_ssids
);
1894 if (params
->filter_ssids
== NULL
)
1896 os_memcpy(params
->filter_ssids
, src
->filter_ssids
,
1897 sizeof(*params
->filter_ssids
) *
1898 src
->num_filter_ssids
);
1899 params
->num_filter_ssids
= src
->num_filter_ssids
;
1902 params
->filter_rssi
= src
->filter_rssi
;
1903 params
->p2p_probe
= src
->p2p_probe
;
1904 params
->only_new_results
= src
->only_new_results
;
1905 params
->low_priority
= src
->low_priority
;
1910 wpa_scan_free_params(params
);
1915 void wpa_scan_free_params(struct wpa_driver_scan_params
*params
)
1922 for (i
= 0; i
< params
->num_ssids
; i
++)
1923 os_free((u8
*) params
->ssids
[i
].ssid
);
1924 os_free((u8
*) params
->extra_ies
);
1925 os_free(params
->freqs
);
1926 os_free(params
->filter_ssids
);
1931 int wpas_start_pno(struct wpa_supplicant
*wpa_s
)
1935 struct wpa_ssid
*ssid
;
1936 struct wpa_driver_scan_params params
;
1938 if (!wpa_s
->sched_scan_supported
)
1941 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
)
1944 if ((wpa_s
->wpa_state
> WPA_SCANNING
) &&
1945 (wpa_s
->wpa_state
<= WPA_COMPLETED
)) {
1946 wpa_printf(MSG_ERROR
, "PNO: In assoc process");
1950 if (wpa_s
->wpa_state
== WPA_SCANNING
) {
1951 wpa_supplicant_cancel_scan(wpa_s
);
1952 if (wpa_s
->sched_scanning
) {
1953 wpa_printf(MSG_DEBUG
, "Schedule PNO on completion of "
1954 "ongoing sched scan");
1955 wpa_supplicant_cancel_sched_scan(wpa_s
);
1956 wpa_s
->pno_sched_pending
= 1;
1961 os_memset(¶ms
, 0, sizeof(params
));
1964 ssid
= wpa_s
->conf
->ssid
;
1966 if (!wpas_network_disabled(wpa_s
, ssid
))
1970 if (num_ssid
> WPAS_MAX_SCAN_SSIDS
) {
1971 wpa_printf(MSG_DEBUG
, "PNO: Use only the first %u SSIDs from "
1972 "%u", WPAS_MAX_SCAN_SSIDS
, (unsigned int) num_ssid
);
1973 num_ssid
= WPAS_MAX_SCAN_SSIDS
;
1976 if (num_ssid
== 0) {
1977 wpa_printf(MSG_DEBUG
, "PNO: No configured SSIDs");
1981 params
.filter_ssids
= os_malloc(sizeof(struct wpa_driver_scan_filter
) *
1983 if (params
.filter_ssids
== NULL
)
1986 ssid
= wpa_s
->conf
->ssid
;
1988 if (!wpas_network_disabled(wpa_s
, ssid
)) {
1989 params
.ssids
[i
].ssid
= ssid
->ssid
;
1990 params
.ssids
[i
].ssid_len
= ssid
->ssid_len
;
1992 os_memcpy(params
.filter_ssids
[i
].ssid
, ssid
->ssid
,
1994 params
.filter_ssids
[i
].ssid_len
= ssid
->ssid_len
;
1995 params
.num_filter_ssids
++;
2003 if (wpa_s
->conf
->filter_rssi
)
2004 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
2006 interval
= wpa_s
->conf
->sched_scan_interval
?
2007 wpa_s
->conf
->sched_scan_interval
: 10;
2009 if (params
.freqs
== NULL
&& wpa_s
->manual_sched_scan_freqs
) {
2010 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit sched scan to specified channels");
2011 params
.freqs
= wpa_s
->manual_sched_scan_freqs
;
2014 ret
= wpa_supplicant_start_sched_scan(wpa_s
, ¶ms
, interval
);
2015 os_free(params
.filter_ssids
);
2019 wpa_msg(wpa_s
, MSG_ERROR
, "Failed to schedule PNO");
2024 int wpas_stop_pno(struct wpa_supplicant
*wpa_s
)
2031 ret
= wpa_supplicant_stop_sched_scan(wpa_s
);
2034 wpa_s
->pno_sched_pending
= 0;
2036 if (wpa_s
->wpa_state
== WPA_SCANNING
)
2037 wpa_supplicant_req_scan(wpa_s
, 0, 0);