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
, 6);
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 */
373 wpabuf_put_u8(buf
, 0x00);
375 wpabuf_put_u8(buf
, 0x40); /* Bit 46 - WNM-Notification */
376 #else /* CONFIG_HS20 */
377 wpabuf_put_u8(buf
, 0x00);
378 #endif /* CONFIG_HS20 */
380 wpabuf_put_u8(buf
, WLAN_EID_INTERWORKING
);
381 wpabuf_put_u8(buf
, is_zero_ether_addr(wpa_s
->conf
->hessid
) ? 1 :
383 wpabuf_put_u8(buf
, wpa_s
->conf
->access_network_type
);
385 if (!is_zero_ether_addr(wpa_s
->conf
->hessid
))
386 wpabuf_put_data(buf
, wpa_s
->conf
->hessid
, ETH_ALEN
);
388 #endif /* CONFIG_INTERWORKING */
391 static struct wpabuf
* wpa_supplicant_extra_ies(struct wpa_supplicant
*wpa_s
)
393 struct wpabuf
*extra_ie
= NULL
;
396 enum wps_request_type req_type
= WPS_REQ_ENROLLEE_INFO
;
397 #endif /* CONFIG_WPS */
399 #ifdef CONFIG_INTERWORKING
400 if (wpa_s
->conf
->interworking
&&
401 wpabuf_resize(&extra_ie
, 100) == 0)
402 wpas_add_interworking_elements(wpa_s
, extra_ie
);
403 #endif /* CONFIG_INTERWORKING */
406 wps
= wpas_wps_in_use(wpa_s
, &req_type
);
409 struct wpabuf
*wps_ie
;
410 wps_ie
= wps_build_probe_req_ie(wps
== 2 ? DEV_PW_PUSHBUTTON
:
413 wpa_s
->wps
->uuid
, req_type
,
416 if (wpabuf_resize(&extra_ie
, wpabuf_len(wps_ie
)) == 0)
417 wpabuf_put_buf(extra_ie
, wps_ie
);
424 size_t ielen
= p2p_scan_ie_buf_len(wpa_s
->global
->p2p
);
425 if (wpabuf_resize(&extra_ie
, ielen
) == 0)
426 wpas_p2p_scan_ie(wpa_s
, extra_ie
);
428 #endif /* CONFIG_P2P */
430 #endif /* CONFIG_WPS */
433 if (wpa_s
->conf
->hs20
&& wpabuf_resize(&extra_ie
, 7) == 0)
434 wpas_hs20_add_indication(extra_ie
, -1);
435 #endif /* CONFIG_HS20 */
444 * Check whether there are any enabled networks or credentials that could be
445 * used for a non-P2P connection.
447 static int non_p2p_network_enabled(struct wpa_supplicant
*wpa_s
)
449 struct wpa_ssid
*ssid
;
451 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
452 if (wpas_network_disabled(wpa_s
, ssid
))
454 if (!ssid
->p2p_group
)
458 if (wpa_s
->conf
->cred
&& wpa_s
->conf
->interworking
&&
459 wpa_s
->conf
->auto_interworking
)
465 #endif /* CONFIG_P2P */
468 static struct hostapd_hw_modes
* get_mode(struct hostapd_hw_modes
*modes
,
470 enum hostapd_hw_mode mode
)
474 for (i
= 0; i
< num_modes
; i
++) {
475 if (modes
[i
].mode
== mode
)
483 static void wpa_setband_scan_freqs_list(struct wpa_supplicant
*wpa_s
,
484 enum hostapd_hw_mode band
,
485 struct wpa_driver_scan_params
*params
)
487 /* Include only supported channels for the specified band */
488 struct hostapd_hw_modes
*mode
;
491 mode
= get_mode(wpa_s
->hw
.modes
, wpa_s
->hw
.num_modes
, band
);
493 /* No channels supported in this band - use empty list */
494 params
->freqs
= os_zalloc(sizeof(int));
498 params
->freqs
= os_zalloc((mode
->num_channels
+ 1) * sizeof(int));
499 if (params
->freqs
== NULL
)
501 for (count
= 0, i
= 0; i
< mode
->num_channels
; i
++) {
502 if (mode
->channels
[i
].flag
& HOSTAPD_CHAN_DISABLED
)
504 params
->freqs
[count
++] = mode
->channels
[i
].freq
;
509 static void wpa_setband_scan_freqs(struct wpa_supplicant
*wpa_s
,
510 struct wpa_driver_scan_params
*params
)
512 if (wpa_s
->hw
.modes
== NULL
)
513 return; /* unknown what channels the driver supports */
515 return; /* already using a limited channel set */
516 if (wpa_s
->setband
== WPA_SETBAND_5G
)
517 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211A
,
519 else if (wpa_s
->setband
== WPA_SETBAND_2G
)
520 wpa_setband_scan_freqs_list(wpa_s
, HOSTAPD_MODE_IEEE80211G
,
525 static void wpa_supplicant_scan(void *eloop_ctx
, void *timeout_ctx
)
527 struct wpa_supplicant
*wpa_s
= eloop_ctx
;
528 struct wpa_ssid
*ssid
;
530 struct wpabuf
*extra_ie
= NULL
;
531 struct wpa_driver_scan_params params
;
532 struct wpa_driver_scan_params
*scan_params
;
534 enum wpa_states prev_state
;
536 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
) {
537 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - PNO is in progress");
541 if (wpa_s
->wpa_state
== WPA_INTERFACE_DISABLED
) {
542 wpa_dbg(wpa_s
, MSG_DEBUG
, "Skip scan - interface disabled");
546 if (wpa_s
->disconnected
&& wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
547 wpa_dbg(wpa_s
, MSG_DEBUG
, "Disconnected - do not scan");
548 wpa_supplicant_set_state(wpa_s
, WPA_DISCONNECTED
);
552 if (wpa_s
->scanning
) {
554 * If we are already in scanning state, we shall reschedule the
555 * the incoming scan request.
557 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already scanning - Reschedule the incoming scan req");
558 wpa_supplicant_req_scan(wpa_s
, 1, 0);
562 if (!wpa_supplicant_enabled_networks(wpa_s
) &&
563 wpa_s
->scan_req
== NORMAL_SCAN_REQ
) {
564 wpa_dbg(wpa_s
, MSG_DEBUG
, "No enabled networks - do not scan");
565 wpa_supplicant_set_state(wpa_s
, WPA_INACTIVE
);
569 if (wpa_s
->conf
->ap_scan
!= 0 &&
570 (wpa_s
->drv_flags
& WPA_DRIVER_FLAGS_WIRED
)) {
571 wpa_dbg(wpa_s
, MSG_DEBUG
, "Using wired authentication - "
572 "overriding ap_scan configuration");
573 wpa_s
->conf
->ap_scan
= 0;
574 wpas_notify_ap_scan_changed(wpa_s
);
577 if (wpa_s
->conf
->ap_scan
== 0) {
578 wpa_supplicant_gen_assoc_event(wpa_s
);
583 if (wpas_p2p_in_progress(wpa_s
)) {
584 wpa_dbg(wpa_s
, MSG_DEBUG
, "Delay station mode scan while P2P operation is in progress");
585 wpa_supplicant_req_scan(wpa_s
, 5, 0);
588 #endif /* CONFIG_P2P */
590 if (wpa_s
->conf
->ap_scan
== 2)
593 max_ssids
= wpa_s
->max_scan_ssids
;
594 if (max_ssids
> WPAS_MAX_SCAN_SSIDS
)
595 max_ssids
= WPAS_MAX_SCAN_SSIDS
;
598 wpa_s
->last_scan_req
= wpa_s
->scan_req
;
599 wpa_s
->scan_req
= NORMAL_SCAN_REQ
;
601 os_memset(¶ms
, 0, sizeof(params
));
603 prev_state
= wpa_s
->wpa_state
;
604 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
605 wpa_s
->wpa_state
== WPA_INACTIVE
)
606 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
609 * If autoscan has set its own scanning parameters
611 if (wpa_s
->autoscan_params
!= NULL
) {
612 scan_params
= wpa_s
->autoscan_params
;
616 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
617 wpa_s
->connect_without_scan
) {
618 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
619 if (ssid
== wpa_s
->connect_without_scan
)
622 wpa_s
->connect_without_scan
= NULL
;
624 wpa_printf(MSG_DEBUG
, "Start a pre-selected network "
625 "without scan step");
626 wpa_supplicant_associate(wpa_s
, NULL
, ssid
);
632 if ((wpa_s
->p2p_in_provisioning
|| wpa_s
->show_group_started
) &&
634 wpa_printf(MSG_DEBUG
, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
635 wpa_s
->p2p_in_provisioning
,
636 wpa_s
->show_group_started
);
637 params
.ssids
[0].ssid
= wpa_s
->go_params
->ssid
;
638 params
.ssids
[0].ssid_len
= wpa_s
->go_params
->ssid_len
;
639 params
.num_ssids
= 1;
642 #endif /* CONFIG_P2P */
644 /* Find the starting point from which to continue scanning */
645 ssid
= wpa_s
->conf
->ssid
;
646 if (wpa_s
->prev_scan_ssid
!= WILDCARD_SSID_SCAN
) {
648 if (ssid
== wpa_s
->prev_scan_ssid
) {
656 if (wpa_s
->last_scan_req
!= MANUAL_SCAN_REQ
&&
657 wpa_s
->conf
->ap_scan
== 2) {
658 wpa_s
->connect_without_scan
= NULL
;
659 wpa_s
->prev_scan_wildcard
= 0;
660 wpa_supplicant_assoc_try(wpa_s
, ssid
);
662 } else if (wpa_s
->conf
->ap_scan
== 2) {
664 * User-initiated scan request in ap_scan == 2; scan with
668 } else if (wpa_s
->reattach
&& wpa_s
->current_ssid
!= NULL
) {
670 * Perform single-channel single-SSID scan for
671 * reassociate-to-same-BSS operation.
674 ssid
= wpa_s
->current_ssid
;
675 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
676 ssid
->ssid
, ssid
->ssid_len
);
677 params
.ssids
[0].ssid
= ssid
->ssid
;
678 params
.ssids
[0].ssid_len
= ssid
->ssid_len
;
679 params
.num_ssids
= 1;
682 * Allocate memory for frequency array, allocate one extra
683 * slot for the zero-terminator.
685 params
.freqs
= os_malloc(sizeof(int) * 2);
686 if (params
.freqs
== NULL
) {
687 wpa_dbg(wpa_s
, MSG_ERROR
, "Memory allocation failed");
690 params
.freqs
[0] = wpa_s
->assoc_freq
;
694 * Reset the reattach flag so that we fall back to full scan if
699 struct wpa_ssid
*start
= ssid
, *tssid
;
701 if (ssid
== NULL
&& max_ssids
> 1)
702 ssid
= wpa_s
->conf
->ssid
;
704 if (!wpas_network_disabled(wpa_s
, ssid
) &&
706 wpa_hexdump_ascii(MSG_DEBUG
, "Scan SSID",
707 ssid
->ssid
, ssid
->ssid_len
);
708 params
.ssids
[params
.num_ssids
].ssid
=
710 params
.ssids
[params
.num_ssids
].ssid_len
=
713 if (params
.num_ssids
+ 1 >= max_ssids
)
719 if (ssid
== NULL
&& max_ssids
> 1 &&
720 start
!= wpa_s
->conf
->ssid
)
721 ssid
= wpa_s
->conf
->ssid
;
724 for (tssid
= wpa_s
->conf
->ssid
; tssid
; tssid
= tssid
->next
) {
725 if (wpas_network_disabled(wpa_s
, tssid
))
727 if ((params
.freqs
|| !freqs_set
) && tssid
->scan_freq
) {
728 int_array_concat(¶ms
.freqs
,
731 os_free(params
.freqs
);
736 int_array_sort_unique(params
.freqs
);
739 if (ssid
&& max_ssids
== 1) {
741 * If the driver is limited to 1 SSID at a time interleave
742 * wildcard SSID scans with specific SSID scans to avoid
743 * waiting a long time for a wildcard scan.
745 if (!wpa_s
->prev_scan_wildcard
) {
746 params
.ssids
[0].ssid
= NULL
;
747 params
.ssids
[0].ssid_len
= 0;
748 wpa_s
->prev_scan_wildcard
= 1;
749 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for "
750 "wildcard SSID (Interleave with specific)");
752 wpa_s
->prev_scan_ssid
= ssid
;
753 wpa_s
->prev_scan_wildcard
= 0;
754 wpa_dbg(wpa_s
, MSG_DEBUG
,
755 "Starting AP scan for specific SSID: %s",
756 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
761 wpa_s
->prev_scan_ssid
= ssid
;
762 wpa_dbg(wpa_s
, MSG_DEBUG
, "Include wildcard SSID in "
765 } else if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
766 wpa_s
->manual_scan_passive
&& params
.num_ssids
== 0) {
767 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use passive scan based on manual request");
769 wpa_s
->prev_scan_ssid
= WILDCARD_SSID_SCAN
;
771 wpa_dbg(wpa_s
, MSG_DEBUG
, "Starting AP scan for wildcard "
776 #endif /* CONFIG_P2P */
778 wpa_supplicant_optimize_freqs(wpa_s
, ¶ms
);
779 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
781 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
782 wpa_s
->manual_scan_only_new
)
783 params
.only_new_results
= 1;
785 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
== NULL
&&
786 wpa_s
->manual_scan_freqs
) {
787 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit manual scan to specified channels");
788 params
.freqs
= wpa_s
->manual_scan_freqs
;
789 wpa_s
->manual_scan_freqs
= NULL
;
792 if (params
.freqs
== NULL
&& wpa_s
->next_scan_freqs
) {
793 wpa_dbg(wpa_s
, MSG_DEBUG
, "Optimize scan based on previously "
794 "generated frequency list");
795 params
.freqs
= wpa_s
->next_scan_freqs
;
797 os_free(wpa_s
->next_scan_freqs
);
798 wpa_s
->next_scan_freqs
= NULL
;
799 wpa_setband_scan_freqs(wpa_s
, ¶ms
);
801 /* See if user specified frequencies. If so, scan only those. */
802 if (wpa_s
->conf
->freq_list
&& !params
.freqs
) {
803 wpa_dbg(wpa_s
, MSG_DEBUG
,
804 "Optimize scan based on conf->freq_list");
805 int_array_concat(¶ms
.freqs
, wpa_s
->conf
->freq_list
);
808 /* Use current associated channel? */
809 if (wpa_s
->conf
->scan_cur_freq
&& !params
.freqs
) {
810 unsigned int num
= wpa_s
->num_multichan_concurrent
;
812 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
814 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
816 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the "
817 "current operating channels since "
818 "scan_cur_freq is enabled");
820 os_free(params
.freqs
);
826 params
.filter_ssids
= wpa_supplicant_build_filter_ssids(
827 wpa_s
->conf
, ¶ms
.num_filter_ssids
);
829 params
.extra_ies
= wpabuf_head(extra_ie
);
830 params
.extra_ies_len
= wpabuf_len(extra_ie
);
834 if (wpa_s
->p2p_in_provisioning
||
835 (wpa_s
->show_group_started
&& wpa_s
->go_params
)) {
837 * The interface may not yet be in P2P mode, so we have to
838 * explicitly request P2P probe to disable CCK rates.
840 params
.p2p_probe
= 1;
842 #endif /* CONFIG_P2P */
844 scan_params
= ¶ms
;
849 * If the driver does not support multi-channel concurrency and a
850 * virtual interface that shares the same radio with the wpa_s interface
851 * is operating there may not be need to scan other channels apart from
852 * the current operating channel on the other virtual interface. Filter
853 * out other channels in case we are trying to find a connection for a
854 * station interface when we are not configured to prefer station
855 * connection and a concurrent operation is already in process.
857 if (wpa_s
->scan_for_connection
&&
858 wpa_s
->last_scan_req
== NORMAL_SCAN_REQ
&&
859 !scan_params
->freqs
&& !params
.freqs
&&
860 wpas_is_p2p_prioritized(wpa_s
) &&
861 wpa_s
->p2p_group_interface
== NOT_P2P_GROUP_INTERFACE
&&
862 non_p2p_network_enabled(wpa_s
)) {
863 unsigned int num
= wpa_s
->num_multichan_concurrent
;
865 params
.freqs
= os_calloc(num
+ 1, sizeof(int));
867 num
= get_shared_radio_freqs(wpa_s
, params
.freqs
, num
);
868 if (num
> 0 && num
== wpa_s
->num_multichan_concurrent
) {
869 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan only the current operating channels since all channels are already used");
871 os_free(params
.freqs
);
876 #endif /* CONFIG_P2P */
878 ret
= wpa_supplicant_trigger_scan(wpa_s
, scan_params
);
880 if (ret
&& wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&& params
.freqs
&&
881 !wpa_s
->manual_scan_freqs
) {
882 /* Restore manual_scan_freqs for the next attempt */
883 wpa_s
->manual_scan_freqs
= params
.freqs
;
887 wpabuf_free(extra_ie
);
888 os_free(params
.freqs
);
889 os_free(params
.filter_ssids
);
892 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate AP scan");
893 if (prev_state
!= wpa_s
->wpa_state
)
894 wpa_supplicant_set_state(wpa_s
, prev_state
);
895 /* Restore scan_req since we will try to scan again */
896 wpa_s
->scan_req
= wpa_s
->last_scan_req
;
897 wpa_supplicant_req_scan(wpa_s
, 1, 0);
899 wpa_s
->scan_for_connection
= 0;
904 void wpa_supplicant_update_scan_int(struct wpa_supplicant
*wpa_s
, int sec
)
906 struct os_reltime remaining
, new_int
;
909 cancelled
= eloop_cancel_timeout_one(wpa_supplicant_scan
, wpa_s
, NULL
,
914 if (cancelled
&& os_reltime_before(&remaining
, &new_int
)) {
915 new_int
.sec
= remaining
.sec
;
916 new_int
.usec
= remaining
.usec
;
920 eloop_register_timeout(new_int
.sec
, new_int
.usec
,
921 wpa_supplicant_scan
, wpa_s
, NULL
);
923 wpa_s
->scan_interval
= sec
;
928 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
929 * @wpa_s: Pointer to wpa_supplicant data
930 * @sec: Number of seconds after which to scan
931 * @usec: Number of microseconds after which to scan
933 * This function is used to schedule a scan for neighboring access points after
934 * the specified time.
936 void wpa_supplicant_req_scan(struct wpa_supplicant
*wpa_s
, int sec
, int usec
)
938 int res
= eloop_deplete_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
,
941 wpa_dbg(wpa_s
, MSG_DEBUG
, "Rescheduling scan request: %d.%06d sec",
943 } else if (res
== 0) {
944 wpa_dbg(wpa_s
, MSG_DEBUG
, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
947 wpa_dbg(wpa_s
, MSG_DEBUG
, "Setting scan request: %d.%06d sec",
949 eloop_register_timeout(sec
, usec
, wpa_supplicant_scan
, wpa_s
, NULL
);
955 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
956 * @wpa_s: Pointer to wpa_supplicant data
957 * @sec: Number of seconds after which to scan
958 * @usec: Number of microseconds after which to scan
959 * Returns: 0 on success or -1 otherwise
961 * This function is used to schedule periodic scans for neighboring
962 * access points after the specified time.
964 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant
*wpa_s
,
967 if (!wpa_s
->sched_scan_supported
)
970 eloop_register_timeout(sec
, usec
,
971 wpa_supplicant_delayed_sched_scan_timeout
,
979 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
980 * @wpa_s: Pointer to wpa_supplicant data
981 * Returns: 0 is sched_scan was started or -1 otherwise
983 * This function is used to schedule periodic scans for neighboring
984 * access points repeating the scan continuously.
986 int wpa_supplicant_req_sched_scan(struct wpa_supplicant
*wpa_s
)
988 struct wpa_driver_scan_params params
;
989 struct wpa_driver_scan_params
*scan_params
;
990 enum wpa_states prev_state
;
991 struct wpa_ssid
*ssid
= NULL
;
992 struct wpabuf
*extra_ie
= NULL
;
994 unsigned int max_sched_scan_ssids
;
998 if (!wpa_s
->sched_scan_supported
)
1001 if (wpa_s
->max_sched_scan_ssids
> WPAS_MAX_SCAN_SSIDS
)
1002 max_sched_scan_ssids
= WPAS_MAX_SCAN_SSIDS
;
1004 max_sched_scan_ssids
= wpa_s
->max_sched_scan_ssids
;
1005 if (max_sched_scan_ssids
< 1 || wpa_s
->conf
->disable_scan_offload
)
1008 if (wpa_s
->sched_scanning
) {
1009 wpa_dbg(wpa_s
, MSG_DEBUG
, "Already sched scanning");
1014 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
1015 if (!wpas_network_disabled(wpa_s
, ssid
) && !ssid
->scan_ssid
) {
1016 /* Use wildcard SSID to find this network */
1018 } else if (!wpas_network_disabled(wpa_s
, ssid
) &&
1023 if (!wpas_network_disabled(wpa_s
, ssid
) &&
1024 ssid
->key_mgmt
== WPA_KEY_MGMT_WPS
) {
1026 * Normal scan is more reliable and faster for WPS
1027 * operations and since these are for short periods of
1028 * time, the benefit of trying to use sched_scan would
1031 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1032 "sched_scan for WPS");
1035 #endif /* CONFIG_WPS */
1040 if (wpa_s
->normal_scans
< 3 &&
1041 (need_ssids
<= wpa_s
->max_scan_ssids
||
1042 wpa_s
->max_scan_ssids
>= (int) max_sched_scan_ssids
)) {
1044 * When normal scan can speed up operations, use that for the
1045 * first operations before starting the sched_scan to allow
1046 * user space sleep more. We do this only if the normal scan
1047 * has functionality that is suitable for this or if the
1048 * sched_scan does not have better support for multiple SSIDs.
1050 wpa_dbg(wpa_s
, MSG_DEBUG
, "Use normal scan instead of "
1051 "sched_scan for initial scans (normal_scans=%d)",
1052 wpa_s
->normal_scans
);
1056 os_memset(¶ms
, 0, sizeof(params
));
1058 /* If we can't allocate space for the filters, we just don't filter */
1059 params
.filter_ssids
= os_zalloc(wpa_s
->max_match_sets
*
1060 sizeof(struct wpa_driver_scan_filter
));
1062 prev_state
= wpa_s
->wpa_state
;
1063 if (wpa_s
->wpa_state
== WPA_DISCONNECTED
||
1064 wpa_s
->wpa_state
== WPA_INACTIVE
)
1065 wpa_supplicant_set_state(wpa_s
, WPA_SCANNING
);
1067 if (wpa_s
->autoscan_params
!= NULL
) {
1068 scan_params
= wpa_s
->autoscan_params
;
1072 /* Find the starting point from which to continue scanning */
1073 ssid
= wpa_s
->conf
->ssid
;
1074 if (wpa_s
->prev_sched_ssid
) {
1076 if (ssid
== wpa_s
->prev_sched_ssid
) {
1084 if (!ssid
|| !wpa_s
->prev_sched_ssid
) {
1085 wpa_dbg(wpa_s
, MSG_DEBUG
, "Beginning of SSID list");
1086 if (wpa_s
->conf
->sched_scan_interval
)
1087 wpa_s
->sched_scan_interval
=
1088 wpa_s
->conf
->sched_scan_interval
;
1089 if (wpa_s
->sched_scan_interval
== 0)
1090 wpa_s
->sched_scan_interval
= 10;
1091 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1092 wpa_s
->first_sched_scan
= 1;
1093 ssid
= wpa_s
->conf
->ssid
;
1094 wpa_s
->prev_sched_ssid
= ssid
;
1098 wpa_dbg(wpa_s
, MSG_DEBUG
, "Add wildcard SSID to sched_scan");
1103 if (wpas_network_disabled(wpa_s
, ssid
))
1106 if (params
.num_filter_ssids
< wpa_s
->max_match_sets
&&
1107 params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
) {
1108 wpa_dbg(wpa_s
, MSG_DEBUG
, "add to filter ssid: %s",
1109 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1110 os_memcpy(params
.filter_ssids
[params
.num_filter_ssids
].ssid
,
1111 ssid
->ssid
, ssid
->ssid_len
);
1112 params
.filter_ssids
[params
.num_filter_ssids
].ssid_len
=
1114 params
.num_filter_ssids
++;
1115 } else if (params
.filter_ssids
&& ssid
->ssid
&& ssid
->ssid_len
)
1117 wpa_dbg(wpa_s
, MSG_DEBUG
, "Not enough room for SSID "
1118 "filter for sched_scan - drop filter");
1119 os_free(params
.filter_ssids
);
1120 params
.filter_ssids
= NULL
;
1121 params
.num_filter_ssids
= 0;
1124 if (ssid
->scan_ssid
&& ssid
->ssid
&& ssid
->ssid_len
) {
1125 if (params
.num_ssids
== max_sched_scan_ssids
)
1126 break; /* only room for broadcast SSID */
1127 wpa_dbg(wpa_s
, MSG_DEBUG
,
1128 "add to active scan ssid: %s",
1129 wpa_ssid_txt(ssid
->ssid
, ssid
->ssid_len
));
1130 params
.ssids
[params
.num_ssids
].ssid
=
1132 params
.ssids
[params
.num_ssids
].ssid_len
=
1135 if (params
.num_ssids
>= max_sched_scan_ssids
) {
1136 wpa_s
->prev_sched_ssid
= ssid
;
1140 (wpas_network_disabled(wpa_s
, ssid
) ||
1147 wpa_s
->prev_sched_ssid
= ssid
;
1151 if (params
.num_filter_ssids
== 0) {
1152 os_free(params
.filter_ssids
);
1153 params
.filter_ssids
= NULL
;
1156 extra_ie
= wpa_supplicant_extra_ies(wpa_s
);
1158 params
.extra_ies
= wpabuf_head(extra_ie
);
1159 params
.extra_ies_len
= wpabuf_len(extra_ie
);
1162 if (wpa_s
->conf
->filter_rssi
)
1163 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
1165 scan_params
= ¶ms
;
1168 if (ssid
|| !wpa_s
->first_sched_scan
) {
1169 wpa_dbg(wpa_s
, MSG_DEBUG
,
1170 "Starting sched scan: interval %d timeout %d",
1171 wpa_s
->sched_scan_interval
, wpa_s
->sched_scan_timeout
);
1173 wpa_dbg(wpa_s
, MSG_DEBUG
,
1174 "Starting sched scan: interval %d (no timeout)",
1175 wpa_s
->sched_scan_interval
);
1178 wpa_setband_scan_freqs(wpa_s
, scan_params
);
1180 ret
= wpa_supplicant_start_sched_scan(wpa_s
, scan_params
,
1181 wpa_s
->sched_scan_interval
);
1182 wpabuf_free(extra_ie
);
1183 os_free(params
.filter_ssids
);
1185 wpa_msg(wpa_s
, MSG_WARNING
, "Failed to initiate sched scan");
1186 if (prev_state
!= wpa_s
->wpa_state
)
1187 wpa_supplicant_set_state(wpa_s
, prev_state
);
1191 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1192 if (ssid
|| !wpa_s
->first_sched_scan
) {
1193 wpa_s
->sched_scan_timed_out
= 0;
1194 eloop_register_timeout(wpa_s
->sched_scan_timeout
, 0,
1195 wpa_supplicant_sched_scan_timeout
,
1197 wpa_s
->first_sched_scan
= 0;
1198 wpa_s
->sched_scan_timeout
/= 2;
1199 wpa_s
->sched_scan_interval
*= 2;
1200 if (wpa_s
->sched_scan_timeout
< wpa_s
->sched_scan_interval
) {
1201 wpa_s
->sched_scan_interval
= 10;
1202 wpa_s
->sched_scan_timeout
= max_sched_scan_ssids
* 2;
1206 /* If there is no more ssids, start next time from the beginning */
1208 wpa_s
->prev_sched_ssid
= NULL
;
1215 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1216 * @wpa_s: Pointer to wpa_supplicant data
1218 * This function is used to cancel a scan request scheduled with
1219 * wpa_supplicant_req_scan().
1221 void wpa_supplicant_cancel_scan(struct wpa_supplicant
*wpa_s
)
1223 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling scan request");
1224 eloop_cancel_timeout(wpa_supplicant_scan
, wpa_s
, NULL
);
1229 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1230 * @wpa_s: Pointer to wpa_supplicant data
1232 * This function is used to stop a delayed scheduled scan.
1234 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant
*wpa_s
)
1236 if (!wpa_s
->sched_scan_supported
)
1239 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling delayed sched scan");
1240 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout
,
1246 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1247 * @wpa_s: Pointer to wpa_supplicant data
1249 * This function is used to stop a periodic scheduled scan.
1251 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant
*wpa_s
)
1253 if (!wpa_s
->sched_scanning
)
1256 wpa_dbg(wpa_s
, MSG_DEBUG
, "Cancelling sched scan");
1257 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout
, wpa_s
, NULL
);
1258 wpa_supplicant_stop_sched_scan(wpa_s
);
1263 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1264 * @wpa_s: Pointer to wpa_supplicant data
1265 * @scanning: Whether scanning is currently in progress
1267 * This function is to generate scanning notifycations. It is called whenever
1268 * there may have been a change in scanning (scan started, completed, stopped).
1269 * wpas_notify_scanning() is called whenever the scanning state changed from the
1270 * previously notified state.
1272 void wpa_supplicant_notify_scanning(struct wpa_supplicant
*wpa_s
,
1275 if (wpa_s
->scanning
!= scanning
) {
1276 wpa_s
->scanning
= scanning
;
1277 wpas_notify_scanning(wpa_s
);
1282 static int wpa_scan_get_max_rate(const struct wpa_scan_res
*res
)
1288 ie
= wpa_scan_get_ie(res
, WLAN_EID_SUPP_RATES
);
1289 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1290 if ((ie
[i
+ 2] & 0x7f) > rate
)
1291 rate
= ie
[i
+ 2] & 0x7f;
1294 ie
= wpa_scan_get_ie(res
, WLAN_EID_EXT_SUPP_RATES
);
1295 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1296 if ((ie
[i
+ 2] & 0x7f) > rate
)
1297 rate
= ie
[i
+ 2] & 0x7f;
1305 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1306 * @res: Scan result entry
1307 * @ie: Information element identitifier (WLAN_EID_*)
1308 * Returns: Pointer to the information element (id field) or %NULL if not found
1310 * This function returns the first matching information element in the scan
1313 const u8
* wpa_scan_get_ie(const struct wpa_scan_res
*res
, u8 ie
)
1315 const u8
*end
, *pos
;
1317 pos
= (const u8
*) (res
+ 1);
1318 end
= pos
+ res
->ie_len
;
1320 while (pos
+ 1 < end
) {
1321 if (pos
+ 2 + pos
[1] > end
)
1333 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1334 * @res: Scan result entry
1335 * @vendor_type: Vendor type (four octets starting the IE payload)
1336 * Returns: Pointer to the information element (id field) or %NULL if not found
1338 * This function returns the first matching information element in the scan
1341 const u8
* wpa_scan_get_vendor_ie(const struct wpa_scan_res
*res
,
1344 const u8
*end
, *pos
;
1346 pos
= (const u8
*) (res
+ 1);
1347 end
= pos
+ res
->ie_len
;
1349 while (pos
+ 1 < end
) {
1350 if (pos
+ 2 + pos
[1] > end
)
1352 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1353 vendor_type
== WPA_GET_BE32(&pos
[2]))
1363 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1364 * @res: Scan result entry
1365 * @vendor_type: Vendor type (four octets starting the IE payload)
1366 * Returns: Pointer to the information element (id field) or %NULL if not found
1368 * This function returns the first matching information element in the scan
1371 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1372 * from Beacon frames instead of either Beacon or Probe Response frames.
1374 const u8
* wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res
*res
,
1377 const u8
*end
, *pos
;
1379 if (res
->beacon_ie_len
== 0)
1382 pos
= (const u8
*) (res
+ 1);
1384 end
= pos
+ res
->beacon_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]))
1400 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1401 * @res: Scan result entry
1402 * @vendor_type: Vendor type (four octets starting the IE payload)
1403 * Returns: Pointer to the information element payload or %NULL if not found
1405 * This function returns concatenated payload of possibly fragmented vendor
1406 * specific information elements in the scan result. The caller is responsible
1407 * for freeing the returned buffer.
1409 struct wpabuf
* wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res
*res
,
1413 const u8
*end
, *pos
;
1415 buf
= wpabuf_alloc(res
->ie_len
);
1419 pos
= (const u8
*) (res
+ 1);
1420 end
= pos
+ res
->ie_len
;
1422 while (pos
+ 1 < end
) {
1423 if (pos
+ 2 + pos
[1] > end
)
1425 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1426 vendor_type
== WPA_GET_BE32(&pos
[2]))
1427 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1431 if (wpabuf_len(buf
) == 0) {
1441 * Channels with a great SNR can operate at full rate. What is a great SNR?
1442 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1443 * rule of thumb is that any SNR above 20 is good." This one
1444 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1445 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1446 * conservative value.
1448 #define GREAT_SNR 30
1450 /* Compare function for sorting scan results. Return >0 if @b is considered
1452 static int wpa_scan_result_compar(const void *a
, const void *b
)
1454 #define IS_5GHZ(n) (n > 4000)
1455 #define MIN(a,b) a < b ? a : b
1456 struct wpa_scan_res
**_wa
= (void *) a
;
1457 struct wpa_scan_res
**_wb
= (void *) b
;
1458 struct wpa_scan_res
*wa
= *_wa
;
1459 struct wpa_scan_res
*wb
= *_wb
;
1460 int wpa_a
, wpa_b
, maxrate_a
, maxrate_b
;
1463 /* WPA/WPA2 support preferred */
1464 wpa_a
= wpa_scan_get_vendor_ie(wa
, WPA_IE_VENDOR_TYPE
) != NULL
||
1465 wpa_scan_get_ie(wa
, WLAN_EID_RSN
) != NULL
;
1466 wpa_b
= wpa_scan_get_vendor_ie(wb
, WPA_IE_VENDOR_TYPE
) != NULL
||
1467 wpa_scan_get_ie(wb
, WLAN_EID_RSN
) != NULL
;
1469 if (wpa_b
&& !wpa_a
)
1471 if (!wpa_b
&& wpa_a
)
1474 /* privacy support preferred */
1475 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) == 0 &&
1476 (wb
->caps
& IEEE80211_CAP_PRIVACY
))
1478 if ((wa
->caps
& IEEE80211_CAP_PRIVACY
) &&
1479 (wb
->caps
& IEEE80211_CAP_PRIVACY
) == 0)
1482 if ((wa
->flags
& wb
->flags
& WPA_SCAN_LEVEL_DBM
) &&
1483 !((wa
->flags
| wb
->flags
) & WPA_SCAN_NOISE_INVALID
)) {
1484 snr_a
= MIN(wa
->level
- wa
->noise
, GREAT_SNR
);
1485 snr_b
= MIN(wb
->level
- wb
->noise
, GREAT_SNR
);
1487 /* Not suitable information to calculate SNR, so use level */
1492 /* best/max rate preferred if SNR close enough */
1493 if ((snr_a
&& snr_b
&& abs(snr_b
- snr_a
) < 5) ||
1494 (wa
->qual
&& wb
->qual
&& abs(wb
->qual
- wa
->qual
) < 10)) {
1495 maxrate_a
= wpa_scan_get_max_rate(wa
);
1496 maxrate_b
= wpa_scan_get_max_rate(wb
);
1497 if (maxrate_a
!= maxrate_b
)
1498 return maxrate_b
- maxrate_a
;
1499 if (IS_5GHZ(wa
->freq
) ^ IS_5GHZ(wb
->freq
))
1500 return IS_5GHZ(wa
->freq
) ? -1 : 1;
1503 /* use freq for channel preference */
1505 /* all things being equal, use SNR; if SNRs are
1506 * identical, use quality values since some drivers may only report
1507 * that value and leave the signal level zero */
1509 return wb
->qual
- wa
->qual
;
1510 return snr_b
- snr_a
;
1517 /* Compare function for sorting scan results when searching a WPS AP for
1518 * provisioning. Return >0 if @b is considered better. */
1519 static int wpa_scan_result_wps_compar(const void *a
, const void *b
)
1521 struct wpa_scan_res
**_wa
= (void *) a
;
1522 struct wpa_scan_res
**_wb
= (void *) b
;
1523 struct wpa_scan_res
*wa
= *_wa
;
1524 struct wpa_scan_res
*wb
= *_wb
;
1525 int uses_wps_a
, uses_wps_b
;
1526 struct wpabuf
*wps_a
, *wps_b
;
1529 /* Optimization - check WPS IE existence before allocated memory and
1530 * doing full reassembly. */
1531 uses_wps_a
= wpa_scan_get_vendor_ie(wa
, WPS_IE_VENDOR_TYPE
) != NULL
;
1532 uses_wps_b
= wpa_scan_get_vendor_ie(wb
, WPS_IE_VENDOR_TYPE
) != NULL
;
1533 if (uses_wps_a
&& !uses_wps_b
)
1535 if (!uses_wps_a
&& uses_wps_b
)
1538 if (uses_wps_a
&& uses_wps_b
) {
1539 wps_a
= wpa_scan_get_vendor_ie_multi(wa
, WPS_IE_VENDOR_TYPE
);
1540 wps_b
= wpa_scan_get_vendor_ie_multi(wb
, WPS_IE_VENDOR_TYPE
);
1541 res
= wps_ap_priority_compar(wps_a
, wps_b
);
1549 * Do not use current AP security policy as a sorting criteria during
1550 * WPS provisioning step since the AP may get reconfigured at the
1551 * completion of provisioning.
1554 /* all things being equal, use signal level; if signal levels are
1555 * identical, use quality values since some drivers may only report
1556 * that value and leave the signal level zero */
1557 if (wb
->level
== wa
->level
)
1558 return wb
->qual
- wa
->qual
;
1559 return wb
->level
- wa
->level
;
1561 #endif /* CONFIG_WPS */
1564 static void dump_scan_res(struct wpa_scan_results
*scan_res
)
1566 #ifndef CONFIG_NO_STDOUT_DEBUG
1569 if (scan_res
->res
== NULL
|| scan_res
->num
== 0)
1572 wpa_printf(MSG_EXCESSIVE
, "Sorted scan results");
1574 for (i
= 0; i
< scan_res
->num
; i
++) {
1575 struct wpa_scan_res
*r
= scan_res
->res
[i
];
1577 if ((r
->flags
& (WPA_SCAN_LEVEL_DBM
| WPA_SCAN_NOISE_INVALID
))
1578 == WPA_SCAN_LEVEL_DBM
) {
1579 int snr
= r
->level
- r
->noise
;
1580 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1581 "noise=%d level=%d snr=%d%s flags=0x%x "
1583 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1584 r
->noise
, r
->level
, snr
,
1585 snr
>= GREAT_SNR
? "*" : "", r
->flags
,
1588 wpa_printf(MSG_EXCESSIVE
, MACSTR
" freq=%d qual=%d "
1589 "noise=%d level=%d flags=0x%x age=%u",
1590 MAC2STR(r
->bssid
), r
->freq
, r
->qual
,
1591 r
->noise
, r
->level
, r
->flags
, r
->age
);
1593 pos
= (u8
*) (r
+ 1);
1595 wpa_hexdump(MSG_EXCESSIVE
, "IEs", pos
, r
->ie_len
);
1597 if (r
->beacon_ie_len
)
1598 wpa_hexdump(MSG_EXCESSIVE
, "Beacon IEs",
1599 pos
, r
->beacon_ie_len
);
1601 #endif /* CONFIG_NO_STDOUT_DEBUG */
1606 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1607 * @wpa_s: Pointer to wpa_supplicant data
1608 * @bssid: BSSID to check
1609 * Returns: 0 if the BSSID is filtered or 1 if not
1611 * This function is used to filter out specific BSSIDs from scan reslts mainly
1612 * for testing purposes (SET bssid_filter ctrl_iface command).
1614 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant
*wpa_s
,
1619 if (wpa_s
->bssid_filter
== NULL
)
1622 for (i
= 0; i
< wpa_s
->bssid_filter_count
; i
++) {
1623 if (os_memcmp(wpa_s
->bssid_filter
+ i
* ETH_ALEN
, bssid
,
1632 static void filter_scan_res(struct wpa_supplicant
*wpa_s
,
1633 struct wpa_scan_results
*res
)
1637 if (wpa_s
->bssid_filter
== NULL
)
1640 for (i
= 0, j
= 0; i
< res
->num
; i
++) {
1641 if (wpa_supplicant_filter_bssid_match(wpa_s
,
1642 res
->res
[i
]->bssid
)) {
1643 res
->res
[j
++] = res
->res
[i
];
1645 os_free(res
->res
[i
]);
1650 if (res
->num
!= j
) {
1651 wpa_printf(MSG_DEBUG
, "Filtered out %d scan results",
1652 (int) (res
->num
- j
));
1659 * wpa_supplicant_get_scan_results - Get scan results
1660 * @wpa_s: Pointer to wpa_supplicant data
1661 * @info: Information about what was scanned or %NULL if not available
1662 * @new_scan: Whether a new scan was performed
1663 * Returns: Scan results, %NULL on failure
1665 * This function request the current scan results from the driver and updates
1666 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1667 * results with wpa_scan_results_free().
1669 struct wpa_scan_results
*
1670 wpa_supplicant_get_scan_results(struct wpa_supplicant
*wpa_s
,
1671 struct scan_info
*info
, int new_scan
)
1673 struct wpa_scan_results
*scan_res
;
1675 int (*compar
)(const void *, const void *) = wpa_scan_result_compar
;
1677 scan_res
= wpa_drv_get_scan_results2(wpa_s
);
1678 if (scan_res
== NULL
) {
1679 wpa_dbg(wpa_s
, MSG_DEBUG
, "Failed to get scan results");
1682 if (scan_res
->fetch_time
.sec
== 0) {
1684 * Make sure we have a valid timestamp if the driver wrapper
1685 * does not set this.
1687 os_get_reltime(&scan_res
->fetch_time
);
1689 filter_scan_res(wpa_s
, scan_res
);
1692 if (wpas_wps_searching(wpa_s
)) {
1693 wpa_dbg(wpa_s
, MSG_DEBUG
, "WPS: Order scan results with WPS "
1694 "provisioning rules");
1695 compar
= wpa_scan_result_wps_compar
;
1697 #endif /* CONFIG_WPS */
1699 qsort(scan_res
->res
, scan_res
->num
, sizeof(struct wpa_scan_res
*),
1701 dump_scan_res(scan_res
);
1703 wpa_bss_update_start(wpa_s
);
1704 for (i
= 0; i
< scan_res
->num
; i
++)
1705 wpa_bss_update_scan_res(wpa_s
, scan_res
->res
[i
],
1706 &scan_res
->fetch_time
);
1707 wpa_bss_update_end(wpa_s
, info
, new_scan
);
1714 * wpa_supplicant_update_scan_results - Update scan results from the driver
1715 * @wpa_s: Pointer to wpa_supplicant data
1716 * Returns: 0 on success, -1 on failure
1718 * This function updates the BSS table within wpa_supplicant based on the
1719 * currently available scan results from the driver without requesting a new
1720 * scan. This is used in cases where the driver indicates an association
1721 * (including roaming within ESS) and wpa_supplicant does not yet have the
1722 * needed information to complete the connection (e.g., to perform validation
1723 * steps in 4-way handshake).
1725 int wpa_supplicant_update_scan_results(struct wpa_supplicant
*wpa_s
)
1727 struct wpa_scan_results
*scan_res
;
1728 scan_res
= wpa_supplicant_get_scan_results(wpa_s
, NULL
, 0);
1729 if (scan_res
== NULL
)
1731 wpa_scan_results_free(scan_res
);
1738 * scan_only_handler - Reports scan results
1740 void scan_only_handler(struct wpa_supplicant
*wpa_s
,
1741 struct wpa_scan_results
*scan_res
)
1743 wpa_dbg(wpa_s
, MSG_DEBUG
, "Scan-only results received");
1744 if (wpa_s
->last_scan_req
== MANUAL_SCAN_REQ
&&
1745 wpa_s
->manual_scan_use_id
&& wpa_s
->own_scan_running
) {
1746 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
"id=%u",
1747 wpa_s
->manual_scan_id
);
1748 wpa_s
->manual_scan_use_id
= 0;
1750 wpa_msg_ctrl(wpa_s
, MSG_INFO
, WPA_EVENT_SCAN_RESULTS
);
1752 wpas_notify_scan_results(wpa_s
);
1753 wpas_notify_scan_done(wpa_s
, 1);
1754 if (wpa_s
->scan_work
) {
1755 struct wpa_radio_work
*work
= wpa_s
->scan_work
;
1756 wpa_s
->scan_work
= NULL
;
1757 radio_work_done(work
);
1762 int wpas_scan_scheduled(struct wpa_supplicant
*wpa_s
)
1764 return eloop_is_timeout_registered(wpa_supplicant_scan
, wpa_s
, NULL
);
1768 struct wpa_driver_scan_params
*
1769 wpa_scan_clone_params(const struct wpa_driver_scan_params
*src
)
1771 struct wpa_driver_scan_params
*params
;
1775 params
= os_zalloc(sizeof(*params
));
1779 for (i
= 0; i
< src
->num_ssids
; i
++) {
1780 if (src
->ssids
[i
].ssid
) {
1781 n
= os_malloc(src
->ssids
[i
].ssid_len
);
1784 os_memcpy(n
, src
->ssids
[i
].ssid
,
1785 src
->ssids
[i
].ssid_len
);
1786 params
->ssids
[i
].ssid
= n
;
1787 params
->ssids
[i
].ssid_len
= src
->ssids
[i
].ssid_len
;
1790 params
->num_ssids
= src
->num_ssids
;
1792 if (src
->extra_ies
) {
1793 n
= os_malloc(src
->extra_ies_len
);
1796 os_memcpy(n
, src
->extra_ies
, src
->extra_ies_len
);
1797 params
->extra_ies
= n
;
1798 params
->extra_ies_len
= src
->extra_ies_len
;
1802 int len
= int_array_len(src
->freqs
);
1803 params
->freqs
= os_malloc((len
+ 1) * sizeof(int));
1804 if (params
->freqs
== NULL
)
1806 os_memcpy(params
->freqs
, src
->freqs
, (len
+ 1) * sizeof(int));
1809 if (src
->filter_ssids
) {
1810 params
->filter_ssids
= os_malloc(sizeof(*params
->filter_ssids
) *
1811 src
->num_filter_ssids
);
1812 if (params
->filter_ssids
== NULL
)
1814 os_memcpy(params
->filter_ssids
, src
->filter_ssids
,
1815 sizeof(*params
->filter_ssids
) *
1816 src
->num_filter_ssids
);
1817 params
->num_filter_ssids
= src
->num_filter_ssids
;
1820 params
->filter_rssi
= src
->filter_rssi
;
1821 params
->p2p_probe
= src
->p2p_probe
;
1822 params
->only_new_results
= src
->only_new_results
;
1827 wpa_scan_free_params(params
);
1832 void wpa_scan_free_params(struct wpa_driver_scan_params
*params
)
1839 for (i
= 0; i
< params
->num_ssids
; i
++)
1840 os_free((u8
*) params
->ssids
[i
].ssid
);
1841 os_free((u8
*) params
->extra_ies
);
1842 os_free(params
->freqs
);
1843 os_free(params
->filter_ssids
);
1848 int wpas_start_pno(struct wpa_supplicant
*wpa_s
)
1852 struct wpa_ssid
*ssid
;
1853 struct wpa_driver_scan_params params
;
1855 if (!wpa_s
->sched_scan_supported
)
1858 if (wpa_s
->pno
|| wpa_s
->pno_sched_pending
)
1861 if ((wpa_s
->wpa_state
> WPA_SCANNING
) &&
1862 (wpa_s
->wpa_state
<= WPA_COMPLETED
)) {
1863 wpa_printf(MSG_ERROR
, "PNO: In assoc process");
1867 if (wpa_s
->wpa_state
== WPA_SCANNING
) {
1868 wpa_supplicant_cancel_scan(wpa_s
);
1869 if (wpa_s
->sched_scanning
) {
1870 wpa_printf(MSG_DEBUG
, "Schedule PNO on completion of "
1871 "ongoing sched scan");
1872 wpa_supplicant_cancel_sched_scan(wpa_s
);
1873 wpa_s
->pno_sched_pending
= 1;
1878 os_memset(¶ms
, 0, sizeof(params
));
1881 ssid
= wpa_s
->conf
->ssid
;
1883 if (!wpas_network_disabled(wpa_s
, ssid
))
1887 if (num_ssid
> WPAS_MAX_SCAN_SSIDS
) {
1888 wpa_printf(MSG_DEBUG
, "PNO: Use only the first %u SSIDs from "
1889 "%u", WPAS_MAX_SCAN_SSIDS
, (unsigned int) num_ssid
);
1890 num_ssid
= WPAS_MAX_SCAN_SSIDS
;
1893 if (num_ssid
== 0) {
1894 wpa_printf(MSG_DEBUG
, "PNO: No configured SSIDs");
1898 params
.filter_ssids
= os_malloc(sizeof(struct wpa_driver_scan_filter
) *
1900 if (params
.filter_ssids
== NULL
)
1903 ssid
= wpa_s
->conf
->ssid
;
1905 if (!wpas_network_disabled(wpa_s
, ssid
)) {
1906 params
.ssids
[i
].ssid
= ssid
->ssid
;
1907 params
.ssids
[i
].ssid_len
= ssid
->ssid_len
;
1909 os_memcpy(params
.filter_ssids
[i
].ssid
, ssid
->ssid
,
1911 params
.filter_ssids
[i
].ssid_len
= ssid
->ssid_len
;
1912 params
.num_filter_ssids
++;
1920 if (wpa_s
->conf
->filter_rssi
)
1921 params
.filter_rssi
= wpa_s
->conf
->filter_rssi
;
1923 interval
= wpa_s
->conf
->sched_scan_interval
?
1924 wpa_s
->conf
->sched_scan_interval
: 10;
1926 if (params
.freqs
== NULL
&& wpa_s
->manual_sched_scan_freqs
) {
1927 wpa_dbg(wpa_s
, MSG_DEBUG
, "Limit sched scan to specified channels");
1928 params
.freqs
= wpa_s
->manual_sched_scan_freqs
;
1931 ret
= wpa_supplicant_start_sched_scan(wpa_s
, ¶ms
, interval
);
1932 os_free(params
.filter_ssids
);
1936 wpa_msg(wpa_s
, MSG_ERROR
, "Failed to schedule PNO");
1941 int wpas_stop_pno(struct wpa_supplicant
*wpa_s
)
1948 ret
= wpa_supplicant_stop_sched_scan(wpa_s
);
1951 wpa_s
->pno_sched_pending
= 0;
1953 if (wpa_s
->wpa_state
== WPA_SCANNING
)
1954 wpa_supplicant_req_scan(wpa_s
, 0, 0);