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"
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 int int_array_len(const int *a)
147 for (i = 0; a && a[i]; i++)
153 static void int_array_concat(int **res, const int *a)
158 reslen = int_array_len(*res);
159 alen = int_array_len(a);
161 n = os_realloc_array(*res, reslen + alen + 1, sizeof(int));
167 for (i = 0; i <= alen; i++)
168 n[reslen + i] = a[i];
173 static int freq_cmp(const void *a, const void *b)
186 static void int_array_sort_unique(int *a)
194 alen = int_array_len(a);
195 qsort(a, alen, sizeof(int), freq_cmp);
199 while (a[i] && a[j]) {
213 * wpa_supplicant_trigger_scan - Request driver to start a scan
214 * @wpa_s: Pointer to wpa_supplicant data
215 * @params: Scan parameters
216 * Returns: 0 on success, -1 on failure
218 int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
219 struct wpa_driver_scan_params *params)
223 wpa_supplicant_notify_scanning(wpa_s, 1);
225 ret = wpa_drv_scan(wpa_s, params);
227 wpa_supplicant_notify_scanning(wpa_s, 0);
228 wpas_notify_scan_done(wpa_s, 0);
230 os_get_time(&wpa_s->scan_trigger_time);
232 wpa_s->normal_scans++;
240 wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
242 struct wpa_supplicant *wpa_s = eloop_ctx;
244 wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
246 if (wpa_supplicant_req_sched_scan(wpa_s))
247 wpa_supplicant_req_scan(wpa_s, 0, 0);
252 wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
254 struct wpa_supplicant *wpa_s = eloop_ctx;
256 wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
258 wpa_s->sched_scan_timed_out = 1;
259 wpa_supplicant_cancel_sched_scan(wpa_s);
264 wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
265 struct wpa_driver_scan_params *params,
270 wpa_supplicant_notify_scanning(wpa_s, 1);
271 ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
273 wpa_supplicant_notify_scanning(wpa_s, 0);
275 wpa_s->sched_scanning = 1;
281 static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
285 ret = wpa_drv_stop_sched_scan(wpa_s);
287 wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
288 /* TODO: what to do if stopping fails? */
296 static struct wpa_driver_scan_filter *
297 wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
299 struct wpa_driver_scan_filter *ssids;
300 struct wpa_ssid *ssid;
304 if (!conf->filter_ssids)
307 for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
308 if (ssid->ssid && ssid->ssid_len)
313 ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
317 for (ssid = conf->ssid; ssid; ssid = ssid->next) {
318 if (!ssid->ssid || !ssid->ssid_len)
320 os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
321 ssids[*num_ssids].ssid_len = ssid->ssid_len;
329 static void wpa_supplicant_optimize_freqs(
330 struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
333 if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
335 /* Optimize provisioning state scan based on GO information */
336 if (wpa_s->p2p_in_provisioning < 5 &&
337 wpa_s->go_params->freq > 0) {
338 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
339 "preferred frequency %d MHz",
340 wpa_s->go_params->freq);
341 params->freqs = os_zalloc(2 * sizeof(int));
343 params->freqs[0] = wpa_s->go_params->freq;
344 } else if (wpa_s->p2p_in_provisioning < 8 &&
345 wpa_s->go_params->freq_list[0]) {
346 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
348 int_array_concat(¶ms->freqs,
349 wpa_s->go_params->freq_list);
351 int_array_sort_unique(params->freqs);
353 wpa_s->p2p_in_provisioning++;
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;
371 if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
373 /* Optimize provisioning scan based on already known channel */
374 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
376 params->freqs = os_zalloc(2 * sizeof(int));
378 params->freqs[0] = wpa_s->wps_freq;
379 wpa_s->known_wps_freq = 0; /* only do this once */
381 #endif /* CONFIG_WPS */
385 #ifdef CONFIG_INTERWORKING
386 static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
389 if (wpa_s->conf->interworking == 0)
392 wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
393 wpabuf_put_u8(buf, 4);
394 wpabuf_put_u8(buf, 0x00);
395 wpabuf_put_u8(buf, 0x00);
396 wpabuf_put_u8(buf, 0x00);
397 wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
399 wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
400 wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
402 wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
404 if (!is_zero_ether_addr(wpa_s->conf->hessid))
405 wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
407 #endif /* CONFIG_INTERWORKING */
410 static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
412 struct wpabuf *extra_ie = NULL;
415 enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
416 #endif /* CONFIG_WPS */
418 #ifdef CONFIG_INTERWORKING
419 if (wpa_s->conf->interworking &&
420 wpabuf_resize(&extra_ie, 100) == 0)
421 wpas_add_interworking_elements(wpa_s, extra_ie);
422 #endif /* CONFIG_INTERWORKING */
425 wps = wpas_wps_in_use(wpa_s, &req_type);
428 struct wpabuf *wps_ie;
429 wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
432 wpa_s->wps->uuid, req_type,
435 if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
436 wpabuf_put_buf(extra_ie, wps_ie);
443 size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
444 if (wpabuf_resize(&extra_ie, ielen) == 0)
445 wpas_p2p_scan_ie(wpa_s, extra_ie);
447 #endif /* CONFIG_P2P */
449 #endif /* CONFIG_WPS */
452 if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
453 wpas_hs20_add_indication(extra_ie);
454 #endif /* CONFIG_HS20 */
463 * Check whether there are any enabled networks or credentials that could be
464 * used for a non-P2P connection.
466 static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
468 struct wpa_ssid *ssid;
470 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
471 if (wpas_network_disabled(wpa_s, ssid))
473 if (!ssid->p2p_group)
477 if (wpa_s->conf->cred && wpa_s->conf->interworking &&
478 wpa_s->conf->auto_interworking)
484 #endif /* CONFIG_P2P */
487 * Find the operating frequency of any other virtual interface that is using
488 * the same radio concurrently.
490 static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s)
492 const char *rn, *rn2;
493 struct wpa_supplicant *ifs;
496 if (!wpa_s->driver->get_radio_name)
499 rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv);
500 if (rn == NULL || rn[0] == '\0')
503 for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) {
504 if (ifs == wpa_s || !ifs->driver->get_radio_name)
507 rn2 = ifs->driver->get_radio_name(ifs->drv_priv);
508 if (!rn2 || os_strcmp(rn, rn2) != 0)
511 if (ifs->current_ssid == NULL || ifs->assoc_freq == 0)
514 if (ifs->current_ssid->mode == WPAS_MODE_AP ||
515 ifs->current_ssid->mode == WPAS_MODE_P2P_GO)
516 return ifs->current_ssid->frequency;
517 if (wpa_drv_get_bssid(ifs, bssid) == 0)
518 return ifs->assoc_freq;
525 static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
527 enum hostapd_hw_mode mode)
531 for (i = 0; i < num_modes; i++) {
532 if (modes[i].mode == mode)
540 static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
541 enum hostapd_hw_mode band,
542 struct wpa_driver_scan_params *params)
544 /* Include only supported channels for the specified band */
545 struct hostapd_hw_modes *mode;
548 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
550 /* No channels supported in this band - use empty list */
551 params->freqs = os_zalloc(sizeof(int));
555 params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
556 if (params->freqs == NULL)
558 for (count = 0, i = 0; i < mode->num_channels; i++) {
559 if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
561 params->freqs[count++] = mode->channels[i].freq;
566 static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
567 struct wpa_driver_scan_params *params)
569 if (wpa_s->hw.modes == NULL)
570 return; /* unknown what channels the driver supports */
572 return; /* already using a limited channel set */
573 if (wpa_s->setband == WPA_SETBAND_5G)
574 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
576 else if (wpa_s->setband == WPA_SETBAND_2G)
577 wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
582 static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
584 struct wpa_supplicant *wpa_s = eloop_ctx;
585 struct wpa_ssid *ssid;
586 enum scan_req_type scan_req = NORMAL_SCAN_REQ;
588 struct wpabuf *extra_ie = NULL;
589 struct wpa_driver_scan_params params;
590 struct wpa_driver_scan_params *scan_params;
592 enum wpa_states prev_state;
594 if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
595 wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
596 wpas_p2p_continue_after_scan(wpa_s);
600 if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
601 wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
602 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
603 wpas_p2p_continue_after_scan(wpa_s);
607 if (!wpa_supplicant_enabled_networks(wpa_s) &&
608 wpa_s->scan_req == NORMAL_SCAN_REQ) {
609 wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
610 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
611 wpas_p2p_continue_after_scan(wpa_s);
615 if (wpa_s->conf->ap_scan != 0 &&
616 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
617 wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
618 "overriding ap_scan configuration");
619 wpa_s->conf->ap_scan = 0;
620 wpas_notify_ap_scan_changed(wpa_s);
623 if (wpa_s->conf->ap_scan == 0) {
624 wpa_supplicant_gen_assoc_event(wpa_s);
629 if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s)) {
630 if (wpa_s->sta_scan_pending &&
631 wpas_p2p_in_progress(wpa_s) == 2 &&
632 wpa_s->global->p2p_cb_on_scan_complete) {
633 wpa_dbg(wpa_s, MSG_DEBUG, "Process pending station "
634 "mode scan during P2P search");
636 wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
637 "while P2P operation is in progress");
638 wpa_s->sta_scan_pending = 1;
639 wpa_supplicant_req_scan(wpa_s, 5, 0);
643 #endif /* CONFIG_P2P */
645 if (wpa_s->conf->ap_scan == 2)
648 max_ssids = wpa_s->max_scan_ssids;
649 if (max_ssids > WPAS_MAX_SCAN_SSIDS)
650 max_ssids = WPAS_MAX_SCAN_SSIDS;
653 scan_req = wpa_s->scan_req;
654 wpa_s->scan_req = NORMAL_SCAN_REQ;
656 os_memset(¶ms, 0, sizeof(params));
658 prev_state = wpa_s->wpa_state;
659 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
660 wpa_s->wpa_state == WPA_INACTIVE)
661 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
664 * If autoscan has set its own scanning parameters
666 if (wpa_s->autoscan_params != NULL) {
667 scan_params = wpa_s->autoscan_params;
671 if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) {
672 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
673 if (ssid == wpa_s->connect_without_scan)
676 wpa_s->connect_without_scan = NULL;
678 wpa_printf(MSG_DEBUG, "Start a pre-selected network "
679 "without scan step");
680 wpa_supplicant_associate(wpa_s, NULL, ssid);
686 if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
688 wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during "
689 "P2P group formation");
690 params.ssids[0].ssid = wpa_s->go_params->ssid;
691 params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
692 params.num_ssids = 1;
695 #endif /* CONFIG_P2P */
697 /* Find the starting point from which to continue scanning */
698 ssid = wpa_s->conf->ssid;
699 if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
701 if (ssid == wpa_s->prev_scan_ssid) {
709 if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) {
710 wpa_s->connect_without_scan = NULL;
711 wpa_s->prev_scan_wildcard = 0;
712 wpa_supplicant_assoc_try(wpa_s, ssid);
714 } else if (wpa_s->conf->ap_scan == 2) {
716 * User-initiated scan request in ap_scan == 2; scan with
721 struct wpa_ssid *start = ssid, *tssid;
723 if (ssid == NULL && max_ssids > 1)
724 ssid = wpa_s->conf->ssid;
726 if (!wpas_network_disabled(wpa_s, ssid) &&
728 wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
729 ssid->ssid, ssid->ssid_len);
730 params.ssids[params.num_ssids].ssid =
732 params.ssids[params.num_ssids].ssid_len =
735 if (params.num_ssids + 1 >= max_ssids)
741 if (ssid == NULL && max_ssids > 1 &&
742 start != wpa_s->conf->ssid)
743 ssid = wpa_s->conf->ssid;
746 for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
747 if (wpas_network_disabled(wpa_s, tssid))
749 if ((params.freqs || !freqs_set) && tssid->scan_freq) {
750 int_array_concat(¶ms.freqs,
753 os_free(params.freqs);
758 int_array_sort_unique(params.freqs);
761 if (ssid && max_ssids == 1) {
763 * If the driver is limited to 1 SSID at a time interleave
764 * wildcard SSID scans with specific SSID scans to avoid
765 * waiting a long time for a wildcard scan.
767 if (!wpa_s->prev_scan_wildcard) {
768 params.ssids[0].ssid = NULL;
769 params.ssids[0].ssid_len = 0;
770 wpa_s->prev_scan_wildcard = 1;
771 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
772 "wildcard SSID (Interleave with specific)");
774 wpa_s->prev_scan_ssid = ssid;
775 wpa_s->prev_scan_wildcard = 0;
776 wpa_dbg(wpa_s, MSG_DEBUG,
777 "Starting AP scan for specific SSID: %s",
778 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
783 wpa_s->prev_scan_ssid = ssid;
784 wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
788 wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
790 wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
795 #endif /* CONFIG_P2P */
797 wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
798 extra_ie = wpa_supplicant_extra_ies(wpa_s);
800 if (params.freqs == NULL && wpa_s->next_scan_freqs) {
801 wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
802 "generated frequency list");
803 params.freqs = wpa_s->next_scan_freqs;
805 os_free(wpa_s->next_scan_freqs);
806 wpa_s->next_scan_freqs = NULL;
807 wpa_setband_scan_freqs(wpa_s, ¶ms);
809 /* See if user specified frequencies. If so, scan only those. */
810 if (wpa_s->conf->freq_list && !params.freqs) {
811 wpa_dbg(wpa_s, MSG_DEBUG,
812 "Optimize scan based on conf->freq_list");
813 int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
816 /* Use current associated channel? */
817 if (wpa_s->conf->scan_cur_freq && !params.freqs) {
818 int freq = shared_vif_oper_freq(wpa_s);
820 wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current "
821 "operating channel (%d MHz) since "
822 "scan_cur_freq is enabled", freq);
823 params.freqs = os_zalloc(sizeof(int) * 2);
825 params.freqs[0] = freq;
829 params.filter_ssids = wpa_supplicant_build_filter_ssids(
830 wpa_s->conf, ¶ms.num_filter_ssids);
832 params.extra_ies = wpabuf_head(extra_ie);
833 params.extra_ies_len = wpabuf_len(extra_ie);
837 if (wpa_s->p2p_in_provisioning ||
838 (wpa_s->show_group_started && wpa_s->go_params)) {
840 * The interface may not yet be in P2P mode, so we have to
841 * explicitly request P2P probe to disable CCK rates.
843 params.p2p_probe = 1;
845 #endif /* CONFIG_P2P */
847 scan_params = ¶ms;
852 * If the driver does not support multi-channel concurrency and a
853 * virtual interface that shares the same radio with the wpa_s interface
854 * is operating there may not be need to scan other channels apart from
855 * the current operating channel on the other virtual interface. Filter
856 * out other channels in case we are trying to find a connection for a
857 * station interface when we are not configured to prefer station
858 * connection and a concurrent operation is already in process.
860 if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ &&
861 !scan_params->freqs && !params.freqs &&
862 wpas_is_p2p_prioritized(wpa_s) &&
863 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) &&
864 wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
865 non_p2p_network_enabled(wpa_s)) {
866 int freq = shared_vif_oper_freq(wpa_s);
868 wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current "
869 "operating channel (%d MHz) since driver does "
870 "not support multi-channel concurrency", freq);
871 params.freqs = os_zalloc(sizeof(int) * 2);
873 params.freqs[0] = freq;
874 scan_params->freqs = params.freqs;
877 #endif /* CONFIG_P2P */
879 ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
881 wpabuf_free(extra_ie);
882 os_free(params.freqs);
883 os_free(params.filter_ssids);
886 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
887 if (prev_state != wpa_s->wpa_state)
888 wpa_supplicant_set_state(wpa_s, prev_state);
889 /* Restore scan_req since we will try to scan again */
890 wpa_s->scan_req = scan_req;
891 wpa_supplicant_req_scan(wpa_s, 1, 0);
893 wpa_s->scan_for_connection = 0;
898 void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
900 struct os_time remaining, new_int;
903 cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
908 if (cancelled && os_time_before(&remaining, &new_int)) {
909 new_int.sec = remaining.sec;
910 new_int.usec = remaining.usec;
913 eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan,
915 wpa_s->scan_interval = sec;
920 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
921 * @wpa_s: Pointer to wpa_supplicant data
922 * @sec: Number of seconds after which to scan
923 * @usec: Number of microseconds after which to scan
925 * This function is used to schedule a scan for neighboring access points after
926 * the specified time.
928 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
930 /* If there's at least one network that should be specifically scanned
931 * then don't cancel the scan and reschedule. Some drivers do
932 * background scanning which generates frequent scan results, and that
933 * causes the specific SSID scan to get continually pushed back and
934 * never happen, which causes hidden APs to never get probe-scanned.
936 if (eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL) &&
937 wpa_s->conf->ap_scan == 1) {
938 struct wpa_ssid *ssid = wpa_s->conf->ssid;
941 if (!wpas_network_disabled(wpa_s, ssid) &&
947 wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
948 "ensure that specific SSID scans occur");
953 wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
955 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
956 eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
961 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
962 * @wpa_s: Pointer to wpa_supplicant data
963 * @sec: Number of seconds after which to scan
964 * @usec: Number of microseconds after which to scan
965 * Returns: 0 on success or -1 otherwise
967 * This function is used to schedule periodic scans for neighboring
968 * access points after the specified time.
970 int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
973 if (!wpa_s->sched_scan_supported)
976 eloop_register_timeout(sec, usec,
977 wpa_supplicant_delayed_sched_scan_timeout,
985 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
986 * @wpa_s: Pointer to wpa_supplicant data
987 * Returns: 0 is sched_scan was started or -1 otherwise
989 * This function is used to schedule periodic scans for neighboring
990 * access points repeating the scan continuously.
992 int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
994 struct wpa_driver_scan_params params;
995 struct wpa_driver_scan_params *scan_params;
996 enum wpa_states prev_state;
997 struct wpa_ssid *ssid = NULL;
998 struct wpabuf *extra_ie = NULL;
1000 unsigned int max_sched_scan_ssids;
1004 if (!wpa_s->sched_scan_supported)
1007 if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
1008 max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
1010 max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
1011 if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
1014 if (wpa_s->sched_scanning) {
1015 wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
1020 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
1021 if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
1022 /* Use wildcard SSID to find this network */
1024 } else if (!wpas_network_disabled(wpa_s, ssid) &&
1029 if (!wpas_network_disabled(wpa_s, ssid) &&
1030 ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
1032 * Normal scan is more reliable and faster for WPS
1033 * operations and since these are for short periods of
1034 * time, the benefit of trying to use sched_scan would
1037 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1038 "sched_scan for WPS");
1041 #endif /* CONFIG_WPS */
1046 if (wpa_s->normal_scans < 3 &&
1047 (need_ssids <= wpa_s->max_scan_ssids ||
1048 wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
1050 * When normal scan can speed up operations, use that for the
1051 * first operations before starting the sched_scan to allow
1052 * user space sleep more. We do this only if the normal scan
1053 * has functionality that is suitable for this or if the
1054 * sched_scan does not have better support for multiple SSIDs.
1056 wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
1057 "sched_scan for initial scans (normal_scans=%d)",
1058 wpa_s->normal_scans);
1062 os_memset(¶ms, 0, sizeof(params));
1064 /* If we can't allocate space for the filters, we just don't filter */
1065 params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
1066 sizeof(struct wpa_driver_scan_filter));
1068 prev_state = wpa_s->wpa_state;
1069 if (wpa_s->wpa_state == WPA_DISCONNECTED ||
1070 wpa_s->wpa_state == WPA_INACTIVE)
1071 wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
1073 if (wpa_s->autoscan_params != NULL) {
1074 scan_params = wpa_s->autoscan_params;
1078 /* Find the starting point from which to continue scanning */
1079 ssid = wpa_s->conf->ssid;
1080 if (wpa_s->prev_sched_ssid) {
1082 if (ssid == wpa_s->prev_sched_ssid) {
1090 if (!ssid || !wpa_s->prev_sched_ssid) {
1091 wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
1092 if (wpa_s->conf->sched_scan_interval)
1093 wpa_s->sched_scan_interval =
1094 wpa_s->conf->sched_scan_interval;
1095 if (wpa_s->sched_scan_interval == 0)
1096 wpa_s->sched_scan_interval = 10;
1097 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1098 wpa_s->first_sched_scan = 1;
1099 ssid = wpa_s->conf->ssid;
1100 wpa_s->prev_sched_ssid = ssid;
1104 wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
1109 if (wpas_network_disabled(wpa_s, ssid))
1112 if (params.num_filter_ssids < wpa_s->max_match_sets &&
1113 params.filter_ssids && ssid->ssid && ssid->ssid_len) {
1114 wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
1115 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1116 os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
1117 ssid->ssid, ssid->ssid_len);
1118 params.filter_ssids[params.num_filter_ssids].ssid_len =
1120 params.num_filter_ssids++;
1121 } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
1123 wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
1124 "filter for sched_scan - drop filter");
1125 os_free(params.filter_ssids);
1126 params.filter_ssids = NULL;
1127 params.num_filter_ssids = 0;
1130 if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
1131 if (params.num_ssids == max_sched_scan_ssids)
1132 break; /* only room for broadcast SSID */
1133 wpa_dbg(wpa_s, MSG_DEBUG,
1134 "add to active scan ssid: %s",
1135 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
1136 params.ssids[params.num_ssids].ssid =
1138 params.ssids[params.num_ssids].ssid_len =
1141 if (params.num_ssids >= max_sched_scan_ssids) {
1142 wpa_s->prev_sched_ssid = ssid;
1146 (wpas_network_disabled(wpa_s, ssid) ||
1153 wpa_s->prev_sched_ssid = ssid;
1157 if (params.num_filter_ssids == 0) {
1158 os_free(params.filter_ssids);
1159 params.filter_ssids = NULL;
1162 extra_ie = wpa_supplicant_extra_ies(wpa_s);
1164 params.extra_ies = wpabuf_head(extra_ie);
1165 params.extra_ies_len = wpabuf_len(extra_ie);
1168 scan_params = ¶ms;
1171 if (ssid || !wpa_s->first_sched_scan) {
1172 wpa_dbg(wpa_s, MSG_DEBUG,
1173 "Starting sched scan: interval %d timeout %d",
1174 wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
1176 wpa_dbg(wpa_s, MSG_DEBUG,
1177 "Starting sched scan: interval %d (no timeout)",
1178 wpa_s->sched_scan_interval);
1181 wpa_setband_scan_freqs(wpa_s, scan_params);
1183 ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
1184 wpa_s->sched_scan_interval);
1185 wpabuf_free(extra_ie);
1186 os_free(params.filter_ssids);
1188 wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
1189 if (prev_state != wpa_s->wpa_state)
1190 wpa_supplicant_set_state(wpa_s, prev_state);
1194 /* If we have more SSIDs to scan, add a timeout so we scan them too */
1195 if (ssid || !wpa_s->first_sched_scan) {
1196 wpa_s->sched_scan_timed_out = 0;
1197 eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
1198 wpa_supplicant_sched_scan_timeout,
1200 wpa_s->first_sched_scan = 0;
1201 wpa_s->sched_scan_timeout /= 2;
1202 wpa_s->sched_scan_interval *= 2;
1203 if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
1204 wpa_s->sched_scan_interval = 10;
1205 wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
1209 /* If there is no more ssids, start next time from the beginning */
1211 wpa_s->prev_sched_ssid = NULL;
1218 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
1219 * @wpa_s: Pointer to wpa_supplicant data
1221 * This function is used to cancel a scan request scheduled with
1222 * wpa_supplicant_req_scan().
1224 void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
1226 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
1227 eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
1228 wpas_p2p_continue_after_scan(wpa_s);
1233 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
1234 * @wpa_s: Pointer to wpa_supplicant data
1236 * This function is used to stop a delayed scheduled scan.
1238 void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
1240 if (!wpa_s->sched_scan_supported)
1243 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
1244 eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
1250 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
1251 * @wpa_s: Pointer to wpa_supplicant data
1253 * This function is used to stop a periodic scheduled scan.
1255 void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
1257 if (!wpa_s->sched_scanning)
1260 wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
1261 eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
1262 wpa_supplicant_stop_sched_scan(wpa_s);
1267 * wpa_supplicant_notify_scanning - Indicate possible scan state change
1268 * @wpa_s: Pointer to wpa_supplicant data
1269 * @scanning: Whether scanning is currently in progress
1271 * This function is to generate scanning notifycations. It is called whenever
1272 * there may have been a change in scanning (scan started, completed, stopped).
1273 * wpas_notify_scanning() is called whenever the scanning state changed from the
1274 * previously notified state.
1276 void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
1279 if (wpa_s->scanning != scanning) {
1280 wpa_s->scanning = scanning;
1281 wpas_notify_scanning(wpa_s);
1286 static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
1292 ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
1293 for (i = 0; ie && i < ie[1]; i++) {
1294 if ((ie[i + 2] & 0x7f) > rate)
1295 rate = ie[i + 2] & 0x7f;
1298 ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
1299 for (i = 0; ie && i < ie[1]; i++) {
1300 if ((ie[i + 2] & 0x7f) > rate)
1301 rate = ie[i + 2] & 0x7f;
1309 * wpa_scan_get_ie - Fetch a specified information element from a scan result
1310 * @res: Scan result entry
1311 * @ie: Information element identitifier (WLAN_EID_*)
1312 * Returns: Pointer to the information element (id field) or %NULL if not found
1314 * This function returns the first matching information element in the scan
1317 const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
1319 const u8 *end, *pos;
1321 pos = (const u8 *) (res + 1);
1322 end = pos + res->ie_len;
1324 while (pos + 1 < end) {
1325 if (pos + 2 + pos[1] > end)
1337 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
1338 * @res: Scan result entry
1339 * @vendor_type: Vendor type (four octets starting the IE payload)
1340 * Returns: Pointer to the information element (id field) or %NULL if not found
1342 * This function returns the first matching information element in the scan
1345 const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
1348 const u8 *end, *pos;
1350 pos = (const u8 *) (res + 1);
1351 end = pos + res->ie_len;
1353 while (pos + 1 < end) {
1354 if (pos + 2 + pos[1] > end)
1356 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1357 vendor_type == WPA_GET_BE32(&pos[2]))
1367 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
1368 * @res: Scan result entry
1369 * @vendor_type: Vendor type (four octets starting the IE payload)
1370 * Returns: Pointer to the information element payload or %NULL if not found
1372 * This function returns concatenated payload of possibly fragmented vendor
1373 * specific information elements in the scan result. The caller is responsible
1374 * for freeing the returned buffer.
1376 struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
1380 const u8 *end, *pos;
1382 buf = wpabuf_alloc(res->ie_len);
1386 pos = (const u8 *) (res + 1);
1387 end = pos + res->ie_len;
1389 while (pos + 1 < end) {
1390 if (pos + 2 + pos[1] > end)
1392 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1393 vendor_type == WPA_GET_BE32(&pos[2]))
1394 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1398 if (wpabuf_len(buf) == 0) {
1408 * Channels with a great SNR can operate at full rate. What is a great SNR?
1409 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
1410 * rule of thumb is that any SNR above 20 is good." This one
1411 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
1412 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
1413 * conservative value.
1415 #define GREAT_SNR 30
1417 /* Compare function for sorting scan results. Return >0 if @b is considered
1419 static int wpa_scan_result_compar(const void *a, const void *b)
1421 #define IS_5GHZ(n) (n > 4000)
1422 #define MIN(a,b) a < b ? a : b
1423 struct wpa_scan_res **_wa = (void *) a;
1424 struct wpa_scan_res **_wb = (void *) b;
1425 struct wpa_scan_res *wa = *_wa;
1426 struct wpa_scan_res *wb = *_wb;
1427 int wpa_a, wpa_b, maxrate_a, maxrate_b;
1430 /* WPA/WPA2 support preferred */
1431 wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
1432 wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
1433 wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
1434 wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
1436 if (wpa_b && !wpa_a)
1438 if (!wpa_b && wpa_a)
1441 /* privacy support preferred */
1442 if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
1443 (wb->caps & IEEE80211_CAP_PRIVACY))
1445 if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
1446 (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
1449 if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
1450 !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
1451 snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
1452 snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
1454 /* Not suitable information to calculate SNR, so use level */
1459 /* best/max rate preferred if SNR close enough */
1460 if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
1461 (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
1462 maxrate_a = wpa_scan_get_max_rate(wa);
1463 maxrate_b = wpa_scan_get_max_rate(wb);
1464 if (maxrate_a != maxrate_b)
1465 return maxrate_b - maxrate_a;
1466 if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
1467 return IS_5GHZ(wa->freq) ? -1 : 1;
1470 /* use freq for channel preference */
1472 /* all things being equal, use SNR; if SNRs are
1473 * identical, use quality values since some drivers may only report
1474 * that value and leave the signal level zero */
1476 return wb->qual - wa->qual;
1477 return snr_b - snr_a;
1484 /* Compare function for sorting scan results when searching a WPS AP for
1485 * provisioning. Return >0 if @b is considered better. */
1486 static int wpa_scan_result_wps_compar(const void *a, const void *b)
1488 struct wpa_scan_res **_wa = (void *) a;
1489 struct wpa_scan_res **_wb = (void *) b;
1490 struct wpa_scan_res *wa = *_wa;
1491 struct wpa_scan_res *wb = *_wb;
1492 int uses_wps_a, uses_wps_b;
1493 struct wpabuf *wps_a, *wps_b;
1496 /* Optimization - check WPS IE existence before allocated memory and
1497 * doing full reassembly. */
1498 uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
1499 uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
1500 if (uses_wps_a && !uses_wps_b)
1502 if (!uses_wps_a && uses_wps_b)
1505 if (uses_wps_a && uses_wps_b) {
1506 wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
1507 wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
1508 res = wps_ap_priority_compar(wps_a, wps_b);
1516 * Do not use current AP security policy as a sorting criteria during
1517 * WPS provisioning step since the AP may get reconfigured at the
1518 * completion of provisioning.
1521 /* all things being equal, use signal level; if signal levels are
1522 * identical, use quality values since some drivers may only report
1523 * that value and leave the signal level zero */
1524 if (wb->level == wa->level)
1525 return wb->qual - wa->qual;
1526 return wb->level - wa->level;
1528 #endif /* CONFIG_WPS */
1531 static void dump_scan_res(struct wpa_scan_results *scan_res)
1533 #ifndef CONFIG_NO_STDOUT_DEBUG
1536 if (scan_res->res == NULL || scan_res->num == 0)
1539 wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
1541 for (i = 0; i < scan_res->num; i++) {
1542 struct wpa_scan_res *r = scan_res->res[i];
1544 if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
1545 == WPA_SCAN_LEVEL_DBM) {
1546 int snr = r->level - r->noise;
1547 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1548 "noise=%d level=%d snr=%d%s flags=0x%x "
1550 MAC2STR(r->bssid), r->freq, r->qual,
1551 r->noise, r->level, snr,
1552 snr >= GREAT_SNR ? "*" : "", r->flags,
1555 wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
1556 "noise=%d level=%d flags=0x%x age=%u",
1557 MAC2STR(r->bssid), r->freq, r->qual,
1558 r->noise, r->level, r->flags, r->age);
1560 pos = (u8 *) (r + 1);
1562 wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
1564 if (r->beacon_ie_len)
1565 wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
1566 pos, r->beacon_ie_len);
1568 #endif /* CONFIG_NO_STDOUT_DEBUG */
1573 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
1574 * @wpa_s: Pointer to wpa_supplicant data
1575 * @bssid: BSSID to check
1576 * Returns: 0 if the BSSID is filtered or 1 if not
1578 * This function is used to filter out specific BSSIDs from scan reslts mainly
1579 * for testing purposes (SET bssid_filter ctrl_iface command).
1581 int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
1586 if (wpa_s->bssid_filter == NULL)
1589 for (i = 0; i < wpa_s->bssid_filter_count; i++) {
1590 if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
1599 static void filter_scan_res(struct wpa_supplicant *wpa_s,
1600 struct wpa_scan_results *res)
1604 if (wpa_s->bssid_filter == NULL)
1607 for (i = 0, j = 0; i < res->num; i++) {
1608 if (wpa_supplicant_filter_bssid_match(wpa_s,
1609 res->res[i]->bssid)) {
1610 res->res[j++] = res->res[i];
1612 os_free(res->res[i]);
1617 if (res->num != j) {
1618 wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
1619 (int) (res->num - j));
1626 * wpa_supplicant_get_scan_results - Get scan results
1627 * @wpa_s: Pointer to wpa_supplicant data
1628 * @info: Information about what was scanned or %NULL if not available
1629 * @new_scan: Whether a new scan was performed
1630 * Returns: Scan results, %NULL on failure
1632 * This function request the current scan results from the driver and updates
1633 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
1634 * results with wpa_scan_results_free().
1636 struct wpa_scan_results *
1637 wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
1638 struct scan_info *info, int new_scan)
1640 struct wpa_scan_results *scan_res;
1642 int (*compar)(const void *, const void *) = wpa_scan_result_compar;
1644 scan_res = wpa_drv_get_scan_results2(wpa_s);
1645 if (scan_res == NULL) {
1646 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
1649 if (scan_res->fetch_time.sec == 0) {
1651 * Make sure we have a valid timestamp if the driver wrapper
1652 * does not set this.
1654 os_get_time(&scan_res->fetch_time);
1656 filter_scan_res(wpa_s, scan_res);
1659 if (wpas_wps_in_progress(wpa_s)) {
1660 wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
1661 "provisioning rules");
1662 compar = wpa_scan_result_wps_compar;
1664 #endif /* CONFIG_WPS */
1666 qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
1668 dump_scan_res(scan_res);
1670 wpa_bss_update_start(wpa_s);
1671 for (i = 0; i < scan_res->num; i++)
1672 wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
1673 &scan_res->fetch_time);
1674 wpa_bss_update_end(wpa_s, info, new_scan);
1681 * wpa_supplicant_update_scan_results - Update scan results from the driver
1682 * @wpa_s: Pointer to wpa_supplicant data
1683 * Returns: 0 on success, -1 on failure
1685 * This function updates the BSS table within wpa_supplicant based on the
1686 * currently available scan results from the driver without requesting a new
1687 * scan. This is used in cases where the driver indicates an association
1688 * (including roaming within ESS) and wpa_supplicant does not yet have the
1689 * needed information to complete the connection (e.g., to perform validation
1690 * steps in 4-way handshake).
1692 int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
1694 struct wpa_scan_results *scan_res;
1695 scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
1696 if (scan_res == NULL)
1698 wpa_scan_results_free(scan_res);
1705 * scan_only_handler - Reports scan results
1707 void scan_only_handler(struct wpa_supplicant *wpa_s,
1708 struct wpa_scan_results *scan_res)
1710 wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
1711 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
1712 wpas_notify_scan_results(wpa_s);
1713 wpas_notify_scan_done(wpa_s, 1);
1717 int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
1719 return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);