2 * WPA Supplicant - Scanning
3 * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/wpa_ctrl.h"
16 #include "wpa_supplicant_i.h"
18 #include "wps_supplicant.h"
19 #include "p2p_supplicant.h"
21 #include "hs20_supplicant.h"
24 #include "gas_query.h"
28 static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
30 struct wpa_ssid *ssid;
31 union wpa_event_data data;
33 ssid = wpa_supplicant_get_ssid(wpa_s);
37 if (wpa_s->current_ssid == NULL) {
38 wpa_s->current_ssid = ssid;
39 if (wpa_s->current_ssid != NULL)
40 wpas_notify_network_changed(wpa_s);
42 wpa_supplicant_initiate_eapol(wpa_s);
43 wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
44 "network - generating associated event");
45 os_memset(&data, 0, sizeof(data));
46 wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
51 static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
52 enum wps_request_type *req_type)
54 struct wpa_ssid *ssid;
57 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
58 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
62 *req_type = wpas_wps_get_req_type(ssid);
63 if (!ssid->eap.phase1)
66 if (os_strstr(ssid->eap.phase1, "pbc=1"))
71 if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
72 !wpa_s->conf->p2p_disabled) {
73 wpa_s->wps->dev.p2p = 1;
76 *req_type = WPS_REQ_ENROLLEE_INFO;
79 #endif /* CONFIG_P2P */
83 #endif /* CONFIG_WPS */
87 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
88 * @wpa_s: Pointer to wpa_supplicant data
89 * Returns: 0 if no networks are enabled, >0 if networks are enabled
91 * This function is used to figure out whether any networks (or Interworking
92 * with enabled credentials and auto_interworking) are present in the current
95 int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
97 struct wpa_ssid *ssid = wpa_s->conf->ssid;
98 int count = 0, disabled = 0;
100 if (!wpas_network_disabled(wpa_s, ssid))
106 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
107 wpa_s->conf->auto_interworking)
109 if (count == 0 && disabled > 0) {
110 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
111 "networks)", disabled);
117 static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
118 struct wpa_ssid *ssid)
121 if (!wpas_network_disabled(wpa_s, ssid))
126 /* ap_scan=2 mode - try to associate with each SSID. */
128 wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
129 "end of scan list - go back to beginning");
130 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
131 wpa_supplicant_req_scan(wpa_s, 0, 0);
135 /* Continue from the next SSID on the next attempt. */
136 wpa_s->prev_scan_ssid = ssid;
138 /* Start from the beginning of the SSID list. */
139 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
141 wpa_supplicant_associate(wpa_s, NULL, ssid);
145 static int int_array_len(const int *a)
148 for (i = 0; a && a[i]; i++)
154 static void int_array_concat(int **res, const int *a)
159 reslen = int_array_len(*res);
160 alen = int_array_len(a);
162 n = os_realloc_array(*res, reslen + alen + 1, sizeof(int));
168 for (i = 0; i <= alen; i++)
169 n[reslen + i] = a[i];
174 static int freq_cmp(const void *a, const void *b)
187 static void int_array_sort_unique(int *a)
195 alen = int_array_len(a);
196 qsort(a, alen, sizeof(int), freq_cmp);
200 while (a[i] && a[j]) {
214 * wpa_supplicant_trigger_scan - Request driver to start a scan
215 * @wpa_s: Pointer to wpa_supplicant data
216 * @params: Scan parameters
217 * Returns: 0 on success, -1 on failure
219 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
220 struct wpa_driver_scan_params *params)
224 wpa_supplicant_notify_scanning(wpa_s, 1);
226 ret = wpa_drv_scan(wpa_s, params);
228 wpa_supplicant_notify_scanning(wpa_s, 0);
229 wpas_notify_scan_done(wpa_s, 0);
231 os_get_time(&wpa_s->scan_trigger_time);
233 wpa_s->normal_scans++;
241 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
243 struct wpa_supplicant *wpa_s = eloop_ctx;
245 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
247 if (wpa_supplicant_req_sched_scan(wpa_s))
248 wpa_supplicant_req_scan(wpa_s, 0, 0);
253 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
255 struct wpa_supplicant *wpa_s = eloop_ctx;
257 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
259 wpa_s->sched_scan_timed_out = 1;
260 wpa_supplicant_cancel_sched_scan(wpa_s);
265 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
266 struct wpa_driver_scan_params *params,
271 wpa_supplicant_notify_scanning(wpa_s, 1);
272 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
274 wpa_supplicant_notify_scanning(wpa_s, 0);
276 wpa_s->sched_scanning = 1;
282 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
286 ret = wpa_drv_stop_sched_scan(wpa_s);
288 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
289 /* TODO: what to do if stopping fails? */
297 static struct wpa_driver_scan_filter *
298 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
300 struct wpa_driver_scan_filter *ssids;
301 struct wpa_ssid *ssid;
305 if (!conf->filter_ssids)
308 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
309 if (ssid->ssid && ssid->ssid_len)
314 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
318 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
319 if (!ssid->ssid || !ssid->ssid_len)
321 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
322 ssids[*num_ssids].ssid_len = ssid->ssid_len;
330 static void wpa_supplicant_optimize_freqs(
331 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
334 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
336 /* Optimize provisioning state scan based on GO information */
337 if (wpa_s->p2p_in_provisioning < 5 &&
338 wpa_s->go_params->freq > 0) {
339 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
340 "preferred frequency %d MHz",
341 wpa_s->go_params->freq);
342 params->freqs = os_zalloc(2 * sizeof(int));
344 params->freqs[0] = wpa_s->go_params->freq;
345 } else if (wpa_s->p2p_in_provisioning < 8 &&
346 wpa_s->go_params->freq_list[0]) {
347 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
349 int_array_concat(¶ms->freqs,
350 wpa_s->go_params->freq_list);
352 int_array_sort_unique(params->freqs);
354 wpa_s->p2p_in_provisioning++;
356 #endif /* CONFIG_P2P */
359 if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
361 * Optimize post-provisioning scan based on channel used
362 * during provisioning.
364 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
365 "that was used during provisioning", wpa_s->wps_freq);
366 params->freqs = os_zalloc(2 * sizeof(int));
368 params->freqs[0] = wpa_s->wps_freq;
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, 4);
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 */
400 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
401 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
403 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
405 if (!is_zero_ether_addr(wpa_s->conf->hessid))
406 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
408 #endif /* CONFIG_INTERWORKING */
411 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
413 struct wpabuf *extra_ie = NULL;
416 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
417 #endif /* CONFIG_WPS */
419 #ifdef CONFIG_INTERWORKING
420 if (wpa_s->conf->interworking &&
421 wpabuf_resize(&extra_ie, 100) == 0)
422 wpas_add_interworking_elements(wpa_s, extra_ie);
423 #endif /* CONFIG_INTERWORKING */
426 wps = wpas_wps_in_use(wpa_s, &req_type);
429 struct wpabuf *wps_ie;
430 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
433 wpa_s->wps->uuid, req_type,
436 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
437 wpabuf_put_buf(extra_ie, wps_ie);
444 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
445 if (wpabuf_resize(&extra_ie, ielen) == 0)
446 wpas_p2p_scan_ie(wpa_s, extra_ie);
448 #endif /* CONFIG_P2P */
450 #endif /* CONFIG_WPS */
453 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
454 wpas_hs20_add_indication(extra_ie);
455 #endif /* CONFIG_HS20 */
464 * Check whether there are any enabled networks or credentials that could be
465 * used for a non-P2P connection.
467 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
469 struct wpa_ssid *ssid;
471 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
472 if (wpas_network_disabled(wpa_s, ssid))
474 if (!ssid->p2p_group)
478 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
479 wpa_s->conf->auto_interworking)
485 #endif /* CONFIG_P2P */
488 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
490 enum hostapd_hw_mode mode)
494 for (i = 0; i < num_modes; i++) {
495 if (modes[i].mode == mode)
503 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
504 enum hostapd_hw_mode band,
505 struct wpa_driver_scan_params *params)
507 /* Include only supported channels for the specified band */
508 struct hostapd_hw_modes *mode;
511 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
513 /* No channels supported in this band - use empty list */
514 params->freqs = os_zalloc(sizeof(int));
518 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
519 if (params->freqs == NULL)
521 for (count = 0, i = 0; i < mode->num_channels; i++) {
522 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
524 params->freqs[count++] = mode->channels[i].freq;
529 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
530 struct wpa_driver_scan_params *params)
532 if (wpa_s->hw.modes == NULL)
533 return; /* unknown what channels the driver supports */
535 return; /* already using a limited channel set */
536 if (wpa_s->setband == WPA_SETBAND_5G)
537 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
539 else if (wpa_s->setband == WPA_SETBAND_2G)
540 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
545 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
547 struct wpa_supplicant *wpa_s = eloop_ctx;
548 struct wpa_ssid *ssid;
549 enum scan_req_type scan_req = NORMAL_SCAN_REQ;
551 struct wpabuf *extra_ie = NULL;
552 struct wpa_driver_scan_params params;
553 struct wpa_driver_scan_params *scan_params;
555 enum wpa_states prev_state;
557 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
558 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
559 wpas_p2p_continue_after_scan(wpa_s);
563 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
564 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
565 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
566 wpas_p2p_continue_after_scan(wpa_s);
570 if (!wpa_supplicant_enabled_networks(wpa_s) &&
571 wpa_s->scan_req == NORMAL_SCAN_REQ) {
572 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
573 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
574 wpas_p2p_continue_after_scan(wpa_s);
578 if (wpa_s->conf->ap_scan != 0 &&
579 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
580 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
581 "overriding ap_scan configuration");
582 wpa_s->conf->ap_scan = 0;
583 wpas_notify_ap_scan_changed(wpa_s);
586 if (wpa_s->conf->ap_scan == 0) {
587 wpa_supplicant_gen_assoc_event(wpa_s);
592 if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
593 if (wpa_s->sta_scan_pending &&
594 wpas_p2p_in_progress(wpa_s) == 2 &&
595 wpa_s->global->p2p_cb_on_scan_complete) {
596 wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station "
597 "mode scan during P2P search");
599 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
600 "while P2P operation is in progress");
601 wpa_s->sta_scan_pending = 1;
602 wpa_supplicant_req_scan(wpa_s, 5, 0);
606 #endif /* CONFIG_P2P */
609 if (gas_query_in_progress(wpa_s->gas)) {
610 wpa_dbg(wpa_s, MSG_DEBUG, "Delay scan while GAS query is in progress");
611 wpa_supplicant_req_scan(wpa_s, 1, 0);
614 #endif /* CONFIG_GAS */
616 if (wpa_s->conf->ap_scan == 2)
619 max_ssids = wpa_s->max_scan_ssids;
620 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
621 max_ssids = WPAS_MAX_SCAN_SSIDS;
624 scan_req = wpa_s->scan_req;
625 wpa_s->scan_req = NORMAL_SCAN_REQ;
627 os_memset(¶ms, 0, sizeof(params));
629 prev_state = wpa_s->wpa_state;
630 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
631 wpa_s->wpa_state == WPA_INACTIVE)
632 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
635 * If autoscan has set its own scanning parameters
637 if (wpa_s->autoscan_params != NULL) {
638 scan_params = wpa_s->autoscan_params;
642 if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) {
643 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
644 if (ssid == wpa_s->connect_without_scan)
647 wpa_s->connect_without_scan = NULL;
649 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
650 "without scan step");
651 wpa_supplicant_associate(wpa_s, NULL, ssid);
657 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
659 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during "
660 "P2P group formation");
661 params.ssids[0].ssid = wpa_s->go_params->ssid;
662 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
663 params.num_ssids = 1;
666 #endif /* CONFIG_P2P */
668 /* Find the starting point from which to continue scanning */
669 ssid = wpa_s->conf->ssid;
670 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
672 if (ssid == wpa_s->prev_scan_ssid) {
680 if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) {
681 wpa_s->connect_without_scan = NULL;
682 wpa_s->prev_scan_wildcard = 0;
683 wpa_supplicant_assoc_try(wpa_s, ssid);
685 } else if (wpa_s->conf->ap_scan == 2) {
687 * User-initiated scan request in ap_scan == 2; scan with
692 struct wpa_ssid *start = ssid, *tssid;
694 if (ssid == NULL && max_ssids > 1)
695 ssid = wpa_s->conf->ssid;
697 if (!wpas_network_disabled(wpa_s, ssid) &&
699 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
700 ssid->ssid, ssid->ssid_len);
701 params.ssids[params.num_ssids].ssid =
703 params.ssids[params.num_ssids].ssid_len =
706 if (params.num_ssids + 1 >= max_ssids)
712 if (ssid == NULL && max_ssids > 1 &&
713 start != wpa_s->conf->ssid)
714 ssid = wpa_s->conf->ssid;
717 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
718 if (wpas_network_disabled(wpa_s, tssid))
720 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
721 int_array_concat(¶ms.freqs,
724 os_free(params.freqs);
729 int_array_sort_unique(params.freqs);
732 if (ssid && max_ssids == 1) {
734 * If the driver is limited to 1 SSID at a time interleave
735 * wildcard SSID scans with specific SSID scans to avoid
736 * waiting a long time for a wildcard scan.
738 if (!wpa_s->prev_scan_wildcard) {
739 params.ssids[0].ssid = NULL;
740 params.ssids[0].ssid_len = 0;
741 wpa_s->prev_scan_wildcard = 1;
742 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
743 "wildcard SSID (Interleave with specific)");
745 wpa_s->prev_scan_ssid = ssid;
746 wpa_s->prev_scan_wildcard = 0;
747 wpa_dbg(wpa_s, MSG_DEBUG,
748 "Starting AP scan for specific SSID: %s",
749 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
754 wpa_s->prev_scan_ssid = ssid;
755 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
759 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
761 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
766 #endif /* CONFIG_P2P */
768 wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
769 extra_ie = wpa_supplicant_extra_ies(wpa_s);
771 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
772 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
773 "generated frequency list");
774 params.freqs = wpa_s->next_scan_freqs;
776 os_free(wpa_s->next_scan_freqs);
777 wpa_s->next_scan_freqs = NULL;
778 wpa_setband_scan_freqs(wpa_s, ¶ms);
780 /* See if user specified frequencies. If so, scan only those. */
781 if (wpa_s->conf->freq_list && !params.freqs) {
782 wpa_dbg(wpa_s, MSG_DEBUG,
783 "Optimize scan based on conf->freq_list");
784 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
787 /* Use current associated channel? */
788 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
789 unsigned int num = wpa_s->num_multichan_concurrent;
791 params.freqs = os_calloc(num + 1, sizeof(int));
793 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
795 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
796 "current operating channels since "
797 "scan_cur_freq is enabled");
799 os_free(params.freqs);
805 params.filter_ssids = wpa_supplicant_build_filter_ssids(
806 wpa_s->conf, ¶ms.num_filter_ssids);
808 params.extra_ies = wpabuf_head(extra_ie);
809 params.extra_ies_len = wpabuf_len(extra_ie);
813 if (wpa_s->p2p_in_provisioning ||
814 (wpa_s->show_group_started && wpa_s->go_params)) {
816 * The interface may not yet be in P2P mode, so we have to
817 * explicitly request P2P probe to disable CCK rates.
819 params.p2p_probe = 1;
821 #endif /* CONFIG_P2P */
823 scan_params = ¶ms;
828 * If the driver does not support multi-channel concurrency and a
829 * virtual interface that shares the same radio with the wpa_s interface
830 * is operating there may not be need to scan other channels apart from
831 * the current operating channel on the other virtual interface. Filter
832 * out other channels in case we are trying to find a connection for a
833 * station interface when we are not configured to prefer station
834 * connection and a concurrent operation is already in process.
836 if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ &&
837 !scan_params->freqs && !params.freqs &&
838 wpas_is_p2p_prioritized(wpa_s) &&
839 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
840 non_p2p_network_enabled(wpa_s)) {
841 unsigned int num = wpa_s->num_multichan_concurrent;
843 params.freqs = os_calloc(num + 1, sizeof(int));
845 num = get_shared_radio_freqs(wpa_s, params.freqs, num);
846 if (num > 0 && num == wpa_s->num_multichan_concurrent) {
847 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
849 os_free(params.freqs);
854 #endif /* CONFIG_P2P */
856 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
858 wpabuf_free(extra_ie);
859 os_free(params.freqs);
860 os_free(params.filter_ssids);
863 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
864 if (prev_state != wpa_s->wpa_state)
865 wpa_supplicant_set_state(wpa_s, prev_state);
866 /* Restore scan_req since we will try to scan again */
867 wpa_s->scan_req = scan_req;
868 wpa_supplicant_req_scan(wpa_s, 1, 0);
870 wpa_s->scan_for_connection = 0;
875 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
877 struct os_time remaining, new_int;
880 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
885 if (cancelled && os_time_before(&remaining, &new_int)) {
886 new_int.sec = remaining.sec;
887 new_int.usec = remaining.usec;
890 eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan,
892 wpa_s->scan_interval = sec;
897 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
898 * @wpa_s: Pointer to wpa_supplicant data
899 * @sec: Number of seconds after which to scan
900 * @usec: Number of microseconds after which to scan
902 * This function is used to schedule a scan for neighboring access points after
903 * the specified time.
905 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
907 /* If there's at least one network that should be specifically scanned
908 * then don't cancel the scan and reschedule. Some drivers do
909 * background scanning which generates frequent scan results, and that
910 * causes the specific SSID scan to get continually pushed back and
911 * never happen, which causes hidden APs to never get probe-scanned.
913 if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
914 wpa_s->conf->ap_scan == 1) {
915 struct wpa_ssid *ssid = wpa_s->conf->ssid;
918 if (!wpas_network_disabled(wpa_s, ssid) &&
924 wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
925 "ensure that specific SSID scans occur");
930 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
932 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
933 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
938 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
939 * @wpa_s: Pointer to wpa_supplicant data
940 * @sec: Number of seconds after which to scan
941 * @usec: Number of microseconds after which to scan
942 * Returns: 0 on success or -1 otherwise
944 * This function is used to schedule periodic scans for neighboring
945 * access points after the specified time.
947 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
950 if (!wpa_s->sched_scan_supported)
953 eloop_register_timeout(sec, usec,
954 wpa_supplicant_delayed_sched_scan_timeout,
962 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
963 * @wpa_s: Pointer to wpa_supplicant data
964 * Returns: 0 is sched_scan was started or -1 otherwise
966 * This function is used to schedule periodic scans for neighboring
967 * access points repeating the scan continuously.
969 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
971 struct wpa_driver_scan_params params;
972 struct wpa_driver_scan_params *scan_params;
973 enum wpa_states prev_state;
974 struct wpa_ssid *ssid = NULL;
975 struct wpabuf *extra_ie = NULL;
977 unsigned int max_sched_scan_ssids;
981 if (!wpa_s->sched_scan_supported)
984 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
985 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
987 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
988 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
991 if (wpa_s->sched_scanning) {
992 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
997 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
998 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
999 /* Use wildcard SSID to find this network */
1001 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1006 if (!wpas_network_disabled(wpa_s, ssid) &&
1007 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1009 * Normal scan is more reliable and faster for WPS
1010 * operations and since these are for short periods of
1011 * time, the benefit of trying to use sched_scan would
1014 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1015 "sched_scan for WPS");
1018 #endif /* CONFIG_WPS */
1023 if (wpa_s->normal_scans < 3 &&
1024 (need_ssids <= wpa_s->max_scan_ssids ||
1025 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1027 * When normal scan can speed up operations, use that for the
1028 * first operations before starting the sched_scan to allow
1029 * user space sleep more. We do this only if the normal scan
1030 * has functionality that is suitable for this or if the
1031 * sched_scan does not have better support for multiple SSIDs.
1033 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1034 "sched_scan for initial scans (normal_scans=%d)",
1035 wpa_s->normal_scans);
1039 os_memset(¶ms, 0, sizeof(params));
1041 /* If we can't allocate space for the filters, we just don't filter */
1042 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1043 sizeof(struct wpa_driver_scan_filter));
1045 prev_state = wpa_s->wpa_state;
1046 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1047 wpa_s->wpa_state == WPA_INACTIVE)
1048 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1050 if (wpa_s->autoscan_params != NULL) {
1051 scan_params = wpa_s->autoscan_params;
1055 /* Find the starting point from which to continue scanning */
1056 ssid = wpa_s->conf->ssid;
1057 if (wpa_s->prev_sched_ssid) {
1059 if (ssid == wpa_s->prev_sched_ssid) {
1067 if (!ssid || !wpa_s->prev_sched_ssid) {
1068 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1069 if (wpa_s->conf->sched_scan_interval)
1070 wpa_s->sched_scan_interval =
1071 wpa_s->conf->sched_scan_interval;
1072 if (wpa_s->sched_scan_interval == 0)
1073 wpa_s->sched_scan_interval = 10;
1074 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1075 wpa_s->first_sched_scan = 1;
1076 ssid = wpa_s->conf->ssid;
1077 wpa_s->prev_sched_ssid = ssid;
1081 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1086 if (wpas_network_disabled(wpa_s, ssid))
1089 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1090 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1091 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1092 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1093 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1094 ssid->ssid, ssid->ssid_len);
1095 params.filter_ssids[params.num_filter_ssids].ssid_len =
1097 params.num_filter_ssids++;
1098 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1100 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1101 "filter for sched_scan - drop filter");
1102 os_free(params.filter_ssids);
1103 params.filter_ssids = NULL;
1104 params.num_filter_ssids = 0;
1107 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1108 if (params.num_ssids == max_sched_scan_ssids)
1109 break; /* only room for broadcast SSID */
1110 wpa_dbg(wpa_s, MSG_DEBUG,
1111 "add to active scan ssid: %s",
1112 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1113 params.ssids[params.num_ssids].ssid =
1115 params.ssids[params.num_ssids].ssid_len =
1118 if (params.num_ssids >= max_sched_scan_ssids) {
1119 wpa_s->prev_sched_ssid = ssid;
1123 (wpas_network_disabled(wpa_s, ssid) ||
1130 wpa_s->prev_sched_ssid = ssid;
1134 if (params.num_filter_ssids == 0) {
1135 os_free(params.filter_ssids);
1136 params.filter_ssids = NULL;
1139 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1141 params.extra_ies = wpabuf_head(extra_ie);
1142 params.extra_ies_len = wpabuf_len(extra_ie);
1145 scan_params = ¶ms;
1148 if (ssid || !wpa_s->first_sched_scan) {
1149 wpa_dbg(wpa_s, MSG_DEBUG,
1150 "Starting sched scan: interval %d timeout %d",
1151 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1153 wpa_dbg(wpa_s, MSG_DEBUG,
1154 "Starting sched scan: interval %d (no timeout)",
1155 wpa_s->sched_scan_interval);
1158 wpa_setband_scan_freqs(wpa_s, scan_params);
1160 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1161 wpa_s->sched_scan_interval);
1162 wpabuf_free(extra_ie);
1163 os_free(params.filter_ssids);
1165 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1166 if (prev_state != wpa_s->wpa_state)
1167 wpa_supplicant_set_state(wpa_s, prev_state);
1171 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1172 if (ssid || !wpa_s->first_sched_scan) {
1173 wpa_s->sched_scan_timed_out = 0;
1174 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1175 wpa_supplicant_sched_scan_timeout,
1177 wpa_s->first_sched_scan = 0;
1178 wpa_s->sched_scan_timeout /= 2;
1179 wpa_s->sched_scan_interval *= 2;
1180 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1181 wpa_s->sched_scan_interval = 10;
1182 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1186 /* If there is no more ssids, start next time from the beginning */
1188 wpa_s->prev_sched_ssid = NULL;
1195 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1196 * @wpa_s: Pointer to wpa_supplicant data
1198 * This function is used to cancel a scan request scheduled with
1199 * wpa_supplicant_req_scan().
1201 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1203 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1204 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1205 wpas_p2p_continue_after_scan(wpa_s);
1210 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1211 * @wpa_s: Pointer to wpa_supplicant data
1213 * This function is used to stop a delayed scheduled scan.
1215 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1217 if (!wpa_s->sched_scan_supported)
1220 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1221 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1227 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1228 * @wpa_s: Pointer to wpa_supplicant data
1230 * This function is used to stop a periodic scheduled scan.
1232 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1234 if (!wpa_s->sched_scanning)
1237 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1238 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1239 wpa_supplicant_stop_sched_scan(wpa_s);
1244 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1245 * @wpa_s: Pointer to wpa_supplicant data
1246 * @scanning: Whether scanning is currently in progress
1248 * This function is to generate scanning notifycations. It is called whenever
1249 * there may have been a change in scanning (scan started, completed, stopped).
1250 * wpas_notify_scanning() is called whenever the scanning state changed from the
1251 * previously notified state.
1253 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1256 if (wpa_s->scanning != scanning) {
1257 wpa_s->scanning = scanning;
1258 wpas_notify_scanning(wpa_s);
1263 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1269 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1270 for (i = 0; ie && i < ie[1]; i++) {
1271 if ((ie[i + 2] & 0x7f) > rate)
1272 rate = ie[i + 2] & 0x7f;
1275 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1276 for (i = 0; ie && i < ie[1]; i++) {
1277 if ((ie[i + 2] & 0x7f) > rate)
1278 rate = ie[i + 2] & 0x7f;
1286 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1287 * @res: Scan result entry
1288 * @ie: Information element identitifier (WLAN_EID_*)
1289 * Returns: Pointer to the information element (id field) or %NULL if not found
1291 * This function returns the first matching information element in the scan
1294 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1296 const u8 *end, *pos;
1298 pos = (const u8 *) (res + 1);
1299 end = pos + res->ie_len;
1301 while (pos + 1 < end) {
1302 if (pos + 2 + pos[1] > end)
1314 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1315 * @res: Scan result entry
1316 * @vendor_type: Vendor type (four octets starting the IE payload)
1317 * Returns: Pointer to the information element (id field) or %NULL if not found
1319 * This function returns the first matching information element in the scan
1322 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1325 const u8 *end, *pos;
1327 pos = (const u8 *) (res + 1);
1328 end = pos + res->ie_len;
1330 while (pos + 1 < end) {
1331 if (pos + 2 + pos[1] > end)
1333 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1334 vendor_type == WPA_GET_BE32(&pos[2]))
1344 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
1345 * @res: Scan result entry
1346 * @vendor_type: Vendor type (four octets starting the IE payload)
1347 * Returns: Pointer to the information element (id field) or %NULL if not found
1349 * This function returns the first matching information element in the scan
1352 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
1353 * from Beacon frames instead of either Beacon or Probe Response frames.
1355 const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
1358 const u8 *end, *pos;
1360 if (res->beacon_ie_len == 0)
1363 pos = (const u8 *) (res + 1);
1365 end = pos + res->beacon_ie_len;
1367 while (pos + 1 < end) {
1368 if (pos + 2 + pos[1] > end)
1370 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1371 vendor_type == WPA_GET_BE32(&pos[2]))
1381 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1382 * @res: Scan result entry
1383 * @vendor_type: Vendor type (four octets starting the IE payload)
1384 * Returns: Pointer to the information element payload or %NULL if not found
1386 * This function returns concatenated payload of possibly fragmented vendor
1387 * specific information elements in the scan result. The caller is responsible
1388 * for freeing the returned buffer.
1390 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1394 const u8 *end, *pos;
1396 buf = wpabuf_alloc(res->ie_len);
1400 pos = (const u8 *) (res + 1);
1401 end = pos + res->ie_len;
1403 while (pos + 1 < end) {
1404 if (pos + 2 + pos[1] > end)
1406 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1407 vendor_type == WPA_GET_BE32(&pos[2]))
1408 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1412 if (wpabuf_len(buf) == 0) {
1422 * Channels with a great SNR can operate at full rate. What is a great SNR?
1423 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1424 * rule of thumb is that any SNR above 20 is good." This one
1425 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1426 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1427 * conservative value.
1429 #define GREAT_SNR 30
1431 /* Compare function for sorting scan results. Return >0 if @b is considered
1433 static int wpa_scan_result_compar(const void *a, const void *b)
1435 #define IS_5GHZ(n) (n > 4000)
1436 #define MIN(a,b) a < b ? a : b
1437 struct wpa_scan_res **_wa = (void *) a;
1438 struct wpa_scan_res **_wb = (void *) b;
1439 struct wpa_scan_res *wa = *_wa;
1440 struct wpa_scan_res *wb = *_wb;
1441 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1444 /* WPA/WPA2 support preferred */
1445 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1446 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1447 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1448 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1450 if (wpa_b && !wpa_a)
1452 if (!wpa_b && wpa_a)
1455 /* privacy support preferred */
1456 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1457 (wb->caps & IEEE80211_CAP_PRIVACY))
1459 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1460 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1463 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1464 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1465 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1466 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1468 /* Not suitable information to calculate SNR, so use level */
1473 /* best/max rate preferred if SNR close enough */
1474 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1475 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1476 maxrate_a = wpa_scan_get_max_rate(wa);
1477 maxrate_b = wpa_scan_get_max_rate(wb);
1478 if (maxrate_a != maxrate_b)
1479 return maxrate_b - maxrate_a;
1480 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1481 return IS_5GHZ(wa->freq) ? -1 : 1;
1484 /* use freq for channel preference */
1486 /* all things being equal, use SNR; if SNRs are
1487 * identical, use quality values since some drivers may only report
1488 * that value and leave the signal level zero */
1490 return wb->qual - wa->qual;
1491 return snr_b - snr_a;
1498 /* Compare function for sorting scan results when searching a WPS AP for
1499 * provisioning. Return >0 if @b is considered better. */
1500 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1502 struct wpa_scan_res **_wa = (void *) a;
1503 struct wpa_scan_res **_wb = (void *) b;
1504 struct wpa_scan_res *wa = *_wa;
1505 struct wpa_scan_res *wb = *_wb;
1506 int uses_wps_a, uses_wps_b;
1507 struct wpabuf *wps_a, *wps_b;
1510 /* Optimization - check WPS IE existence before allocated memory and
1511 * doing full reassembly. */
1512 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1513 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1514 if (uses_wps_a && !uses_wps_b)
1516 if (!uses_wps_a && uses_wps_b)
1519 if (uses_wps_a && uses_wps_b) {
1520 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1521 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1522 res = wps_ap_priority_compar(wps_a, wps_b);
1530 * Do not use current AP security policy as a sorting criteria during
1531 * WPS provisioning step since the AP may get reconfigured at the
1532 * completion of provisioning.
1535 /* all things being equal, use signal level; if signal levels are
1536 * identical, use quality values since some drivers may only report
1537 * that value and leave the signal level zero */
1538 if (wb->level == wa->level)
1539 return wb->qual - wa->qual;
1540 return wb->level - wa->level;
1542 #endif /* CONFIG_WPS */
1545 static void dump_scan_res(struct wpa_scan_results *scan_res)
1547 #ifndef CONFIG_NO_STDOUT_DEBUG
1550 if (scan_res->res == NULL || scan_res->num == 0)
1553 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1555 for (i = 0; i < scan_res->num; i++) {
1556 struct wpa_scan_res *r = scan_res->res[i];
1558 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1559 == WPA_SCAN_LEVEL_DBM) {
1560 int snr = r->level - r->noise;
1561 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1562 "noise=%d level=%d snr=%d%s flags=0x%x "
1564 MAC2STR(r->bssid), r->freq, r->qual,
1565 r->noise, r->level, snr,
1566 snr >= GREAT_SNR ? "*" : "", r->flags,
1569 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1570 "noise=%d level=%d flags=0x%x age=%u",
1571 MAC2STR(r->bssid), r->freq, r->qual,
1572 r->noise, r->level, r->flags, r->age);
1574 pos = (u8 *) (r + 1);
1576 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1578 if (r->beacon_ie_len)
1579 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1580 pos, r->beacon_ie_len);
1582 #endif /* CONFIG_NO_STDOUT_DEBUG */
1587 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1588 * @wpa_s: Pointer to wpa_supplicant data
1589 * @bssid: BSSID to check
1590 * Returns: 0 if the BSSID is filtered or 1 if not
1592 * This function is used to filter out specific BSSIDs from scan reslts mainly
1593 * for testing purposes (SET bssid_filter ctrl_iface command).
1595 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1600 if (wpa_s->bssid_filter == NULL)
1603 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1604 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1613 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1614 struct wpa_scan_results *res)
1618 if (wpa_s->bssid_filter == NULL)
1621 for (i = 0, j = 0; i < res->num; i++) {
1622 if (wpa_supplicant_filter_bssid_match(wpa_s,
1623 res->res[i]->bssid)) {
1624 res->res[j++] = res->res[i];
1626 os_free(res->res[i]);
1631 if (res->num != j) {
1632 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1633 (int) (res->num - j));
1640 * wpa_supplicant_get_scan_results - Get scan results
1641 * @wpa_s: Pointer to wpa_supplicant data
1642 * @info: Information about what was scanned or %NULL if not available
1643 * @new_scan: Whether a new scan was performed
1644 * Returns: Scan results, %NULL on failure
1646 * This function request the current scan results from the driver and updates
1647 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1648 * results with wpa_scan_results_free().
1650 struct wpa_scan_results *
1651 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1652 struct scan_info *info, int new_scan)
1654 struct wpa_scan_results *scan_res;
1656 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1658 scan_res = wpa_drv_get_scan_results2(wpa_s);
1659 if (scan_res == NULL) {
1660 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1663 if (scan_res->fetch_time.sec == 0) {
1665 * Make sure we have a valid timestamp if the driver wrapper
1666 * does not set this.
1668 os_get_time(&scan_res->fetch_time);
1670 filter_scan_res(wpa_s, scan_res);
1673 if (wpas_wps_in_progress(wpa_s)) {
1674 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1675 "provisioning rules");
1676 compar = wpa_scan_result_wps_compar;
1678 #endif /* CONFIG_WPS */
1680 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1682 dump_scan_res(scan_res);
1684 wpa_bss_update_start(wpa_s);
1685 for (i = 0; i < scan_res->num; i++)
1686 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1687 &scan_res->fetch_time);
1688 wpa_bss_update_end(wpa_s, info, new_scan);
1695 * wpa_supplicant_update_scan_results - Update scan results from the driver
1696 * @wpa_s: Pointer to wpa_supplicant data
1697 * Returns: 0 on success, -1 on failure
1699 * This function updates the BSS table within wpa_supplicant based on the
1700 * currently available scan results from the driver without requesting a new
1701 * scan. This is used in cases where the driver indicates an association
1702 * (including roaming within ESS) and wpa_supplicant does not yet have the
1703 * needed information to complete the connection (e.g., to perform validation
1704 * steps in 4-way handshake).
1706 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1708 struct wpa_scan_results *scan_res;
1709 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1710 if (scan_res == NULL)
1712 wpa_scan_results_free(scan_res);
1719 * scan_only_handler - Reports scan results
1721 void scan_only_handler(struct wpa_supplicant *wpa_s,
1722 struct wpa_scan_results *scan_res)
1724 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1725 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1726 wpas_notify_scan_results(wpa_s);
1727 wpas_notify_scan_done(wpa_s, 1);
1731 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1733 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);