/*
* WPA Supplicant - Scanning
- * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
-#include "includes.h"
+#include "utils/includes.h"
-#include "common.h"
-#include "eloop.h"
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "common/ieee802_11_defs.h"
#include "config.h"
#include "wpa_supplicant_i.h"
-#include "mlme.h"
-#include "uuid.h"
+#include "driver_i.h"
+#include "wps_supplicant.h"
+#include "p2p_supplicant.h"
+#include "p2p/p2p.h"
+#include "hs20_supplicant.h"
+#include "notify.h"
+#include "bss.h"
+#include "scan.h"
static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
if (ssid == NULL)
return;
- if (wpa_s->current_ssid == NULL)
+ if (wpa_s->current_ssid == NULL) {
wpa_s->current_ssid = ssid;
+ if (wpa_s->current_ssid != NULL)
+ wpas_notify_network_changed(wpa_s);
+ }
wpa_supplicant_initiate_eapol(wpa_s);
- wpa_printf(MSG_DEBUG, "Already associated with a configured network - "
- "generating associated event");
+ wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
+ "network - generating associated event");
os_memset(&data, 0, sizeof(data));
wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
}
-static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
+#ifdef CONFIG_WPS
+static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
+ enum wps_request_type *req_type)
{
- struct wpa_supplicant *wpa_s = eloop_ctx;
struct wpa_ssid *ssid;
- int enabled, scan_req = 0, ret;
- const u8 *extra_ie = NULL;
- size_t extra_ie_len = 0;
+ int wps = 0;
- if (wpa_s->disconnected && !wpa_s->scan_req)
- return;
+ for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+ if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
+ continue;
- enabled = 0;
- ssid = wpa_s->conf->ssid;
+ wps = 1;
+ *req_type = wpas_wps_get_req_type(ssid);
+ if (!ssid->eap.phase1)
+ continue;
+
+ if (os_strstr(ssid->eap.phase1, "pbc=1"))
+ return 2;
+ }
+
+#ifdef CONFIG_P2P
+ if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p) {
+ wpa_s->wps->dev.p2p = 1;
+ if (!wps) {
+ wps = 1;
+ *req_type = WPS_REQ_ENROLLEE_INFO;
+ }
+ }
+#endif /* CONFIG_P2P */
+
+ return wps;
+}
+#endif /* CONFIG_WPS */
+
+
+int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_ssid *ssid = wpa_s->conf->ssid;
+ int count = 0;
+ while (ssid) {
+ if (!wpas_network_disabled(wpa_s, ssid))
+ count++;
+ ssid = ssid->next;
+ }
+ return count;
+}
+
+
+static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
+ struct wpa_ssid *ssid)
+{
while (ssid) {
- if (!ssid->disabled) {
- enabled++;
+ if (!wpas_network_disabled(wpa_s, ssid))
break;
- }
ssid = ssid->next;
}
- if (!enabled && !wpa_s->scan_req) {
- wpa_printf(MSG_DEBUG, "No enabled networks - do not scan");
+
+ /* ap_scan=2 mode - try to associate with each SSID. */
+ if (ssid == NULL) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
+ "end of scan list - go back to beginning");
+ wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
+ wpa_supplicant_req_scan(wpa_s, 0, 0);
+ return;
+ }
+ if (ssid->next) {
+ /* Continue from the next SSID on the next attempt. */
+ wpa_s->prev_scan_ssid = ssid;
+ } else {
+ /* Start from the beginning of the SSID list. */
+ wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
+ }
+ wpa_supplicant_associate(wpa_s, NULL, ssid);
+}
+
+
+static int int_array_len(const int *a)
+{
+ int i;
+ for (i = 0; a && a[i]; i++)
+ ;
+ return i;
+}
+
+
+static void int_array_concat(int **res, const int *a)
+{
+ int reslen, alen, i;
+ int *n;
+
+ reslen = int_array_len(*res);
+ alen = int_array_len(a);
+
+ n = os_realloc(*res, (reslen + alen + 1) * sizeof(int));
+ if (n == NULL) {
+ os_free(*res);
+ *res = NULL;
+ return;
+ }
+ for (i = 0; i <= alen; i++)
+ n[reslen + i] = a[i];
+ *res = n;
+}
+
+
+static int freq_cmp(const void *a, const void *b)
+{
+ int _a = *(int *) a;
+ int _b = *(int *) b;
+
+ if (_a == 0)
+ return 1;
+ if (_b == 0)
+ return -1;
+ return _a - _b;
+}
+
+
+static void int_array_sort_unique(int *a)
+{
+ int alen;
+ int i, j;
+
+ if (a == NULL)
+ return;
+
+ alen = int_array_len(a);
+ qsort(a, alen, sizeof(int), freq_cmp);
+
+ i = 0;
+ j = 1;
+ while (a[i] && a[j]) {
+ if (a[i] == a[j]) {
+ j++;
+ continue;
+ }
+ a[++i] = a[j++];
+ }
+ if (a[i])
+ i++;
+ a[i] = 0;
+}
+
+
+int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
+ struct wpa_driver_scan_params *params)
+{
+ int ret;
+
+ wpa_supplicant_notify_scanning(wpa_s, 1);
+
+ ret = wpa_drv_scan(wpa_s, params);
+ if (ret) {
+ wpa_supplicant_notify_scanning(wpa_s, 0);
+ wpas_notify_scan_done(wpa_s, 0);
+ } else {
+ wpa_s->scan_runs++;
+ wpa_s->normal_scans++;
+ }
+
+ return ret;
+}
+
+
+static void
+wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+
+ wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
+
+ if (wpa_supplicant_req_sched_scan(wpa_s))
+ wpa_supplicant_req_scan(wpa_s, 0, 0);
+}
+
+
+static void
+wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+
+ wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
+
+ wpa_s->sched_scan_timed_out = 1;
+ wpa_supplicant_cancel_sched_scan(wpa_s);
+}
+
+
+static int
+wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
+ struct wpa_driver_scan_params *params,
+ int interval)
+{
+ int ret;
+
+ wpa_supplicant_notify_scanning(wpa_s, 1);
+ ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
+ if (ret)
+ wpa_supplicant_notify_scanning(wpa_s, 0);
+ else
+ wpa_s->sched_scanning = 1;
+
+ return ret;
+}
+
+
+static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
+{
+ int ret;
+
+ ret = wpa_drv_stop_sched_scan(wpa_s);
+ if (ret) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
+ /* TODO: what to do if stopping fails? */
+ return -1;
+ }
+
+ return ret;
+}
+
+
+static struct wpa_driver_scan_filter *
+wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
+{
+ struct wpa_driver_scan_filter *ssids;
+ struct wpa_ssid *ssid;
+ size_t count;
+
+ *num_ssids = 0;
+ if (!conf->filter_ssids)
+ return NULL;
+
+ for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
+ if (ssid->ssid && ssid->ssid_len)
+ count++;
+ }
+ if (count == 0)
+ return NULL;
+ ssids = os_zalloc(count * sizeof(struct wpa_driver_scan_filter));
+ if (ssids == NULL)
+ return NULL;
+
+ for (ssid = conf->ssid; ssid; ssid = ssid->next) {
+ if (!ssid->ssid || !ssid->ssid_len)
+ continue;
+ os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
+ ssids[*num_ssids].ssid_len = ssid->ssid_len;
+ (*num_ssids)++;
+ }
+
+ return ssids;
+}
+
+
+static void wpa_supplicant_optimize_freqs(
+ struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
+{
+#ifdef CONFIG_P2P
+ if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
+ wpa_s->go_params) {
+ /* Optimize provisioning state scan based on GO information */
+ if (wpa_s->p2p_in_provisioning < 5 &&
+ wpa_s->go_params->freq > 0) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
+ "preferred frequency %d MHz",
+ wpa_s->go_params->freq);
+ params->freqs = os_zalloc(2 * sizeof(int));
+ if (params->freqs)
+ params->freqs[0] = wpa_s->go_params->freq;
+ } else if (wpa_s->p2p_in_provisioning < 8 &&
+ wpa_s->go_params->freq_list[0]) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
+ "channels");
+ int_array_concat(¶ms->freqs,
+ wpa_s->go_params->freq_list);
+ if (params->freqs)
+ int_array_sort_unique(params->freqs);
+ }
+ wpa_s->p2p_in_provisioning++;
+ }
+#endif /* CONFIG_P2P */
+
+#ifdef CONFIG_WPS
+ if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
+ /*
+ * Optimize post-provisioning scan based on channel used
+ * during provisioning.
+ */
+ wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
+ "that was used during provisioning", wpa_s->wps_freq);
+ params->freqs = os_zalloc(2 * sizeof(int));
+ if (params->freqs)
+ params->freqs[0] = wpa_s->wps_freq;
+ wpa_s->after_wps--;
+ }
+
+ if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
+ {
+ /* Optimize provisioning scan based on already known channel */
+ wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
+ wpa_s->wps_freq);
+ params->freqs = os_zalloc(2 * sizeof(int));
+ if (params->freqs)
+ params->freqs[0] = wpa_s->wps_freq;
+ wpa_s->known_wps_freq = 0; /* only do this once */
+ }
+#endif /* CONFIG_WPS */
+}
+
+
+#ifdef CONFIG_INTERWORKING
+static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
+ struct wpabuf *buf)
+{
+ if (wpa_s->conf->interworking == 0)
+ return;
+
+ wpabuf_put_u8(buf, WLAN_EID_EXT_CAPAB);
+ wpabuf_put_u8(buf, 4);
+ wpabuf_put_u8(buf, 0x00);
+ wpabuf_put_u8(buf, 0x00);
+ wpabuf_put_u8(buf, 0x00);
+ wpabuf_put_u8(buf, 0x80); /* Bit 31 - Interworking */
+
+ wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
+ wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
+ 1 + ETH_ALEN);
+ wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
+ /* No Venue Info */
+ if (!is_zero_ether_addr(wpa_s->conf->hessid))
+ wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
+}
+#endif /* CONFIG_INTERWORKING */
+
+
+static struct wpabuf *
+wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s,
+ struct wpa_driver_scan_params *params)
+{
+ struct wpabuf *extra_ie = NULL;
+#ifdef CONFIG_WPS
+ int wps = 0;
+ enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
+#endif /* CONFIG_WPS */
+
+#ifdef CONFIG_INTERWORKING
+ if (wpa_s->conf->interworking &&
+ wpabuf_resize(&extra_ie, 100) == 0)
+ wpas_add_interworking_elements(wpa_s, extra_ie);
+#endif /* CONFIG_INTERWORKING */
+
+#ifdef CONFIG_WPS
+ wps = wpas_wps_in_use(wpa_s, &req_type);
+
+ if (wps) {
+ struct wpabuf *wps_ie;
+ wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
+ DEV_PW_DEFAULT,
+ &wpa_s->wps->dev,
+ wpa_s->wps->uuid, req_type,
+ 0, NULL);
+ if (wps_ie) {
+ if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
+ wpabuf_put_buf(extra_ie, wps_ie);
+ wpabuf_free(wps_ie);
+ }
+ }
+
+#ifdef CONFIG_P2P
+ if (wps) {
+ size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
+ if (wpabuf_resize(&extra_ie, ielen) == 0)
+ wpas_p2p_scan_ie(wpa_s, extra_ie);
+ }
+#endif /* CONFIG_P2P */
+
+#endif /* CONFIG_WPS */
+
+ return extra_ie;
+}
+
+
+static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+ struct wpa_ssid *ssid;
+ int scan_req = 0, ret;
+ struct wpabuf *extra_ie;
+ struct wpa_driver_scan_params params;
+ struct wpa_driver_scan_params *scan_params;
+ size_t max_ssids;
+ enum wpa_states prev_state;
+
+ if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
+ return;
+ }
+
+ if (wpa_s->disconnected && !wpa_s->scan_req) {
+ wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
+ return;
+ }
+
+ if (!wpa_supplicant_enabled_networks(wpa_s) &&
+ !wpa_s->scan_req) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
return;
}
- scan_req = wpa_s->scan_req;
- wpa_s->scan_req = 0;
if (wpa_s->conf->ap_scan != 0 &&
- wpa_s->driver && IS_WIRED(wpa_s->driver)) {
- wpa_printf(MSG_DEBUG, "Using wired authentication - "
- "overriding ap_scan configuration");
+ (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
+ "overriding ap_scan configuration");
wpa_s->conf->ap_scan = 0;
+ wpas_notify_ap_scan_changed(wpa_s);
}
if (wpa_s->conf->ap_scan == 0) {
return;
}
+#ifdef CONFIG_P2P
+ if (wpas_p2p_in_progress(wpa_s)) {
+ if (wpa_s->wpa_state == WPA_SCANNING) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan "
+ "while P2P operation is in progress");
+ wpa_supplicant_req_scan(wpa_s, 5, 0);
+ } else {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Do not request scan while "
+ "P2P operation is in progress");
+ }
+ return;
+ }
+#endif /* CONFIG_P2P */
+
+ if (wpa_s->conf->ap_scan == 2)
+ max_ssids = 1;
+ else {
+ max_ssids = wpa_s->max_scan_ssids;
+ if (max_ssids > WPAS_MAX_SCAN_SSIDS)
+ max_ssids = WPAS_MAX_SCAN_SSIDS;
+ }
+
+ scan_req = wpa_s->scan_req;
+ wpa_s->scan_req = 0;
+
+ os_memset(¶ms, 0, sizeof(params));
+
+ prev_state = wpa_s->wpa_state;
if (wpa_s->wpa_state == WPA_DISCONNECTED ||
wpa_s->wpa_state == WPA_INACTIVE)
wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
+ /*
+ * If autoscan has set its own scanning parameters
+ */
+ if (wpa_s->autoscan_params != NULL) {
+ scan_params = wpa_s->autoscan_params;
+ goto scan;
+ }
+
+ if (scan_req != 2 && wpa_s->connect_without_scan) {
+ for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+ if (ssid == wpa_s->connect_without_scan)
+ break;
+ }
+ wpa_s->connect_without_scan = NULL;
+ if (ssid) {
+ wpa_printf(MSG_DEBUG, "Start a pre-selected network "
+ "without scan step");
+ wpa_supplicant_associate(wpa_s, NULL, ssid);
+ return;
+ }
+ }
+
+#ifdef CONFIG_P2P
+ if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
+ wpa_s->go_params) {
+ wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during "
+ "P2P group formation");
+ params.ssids[0].ssid = wpa_s->go_params->ssid;
+ params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
+ params.num_ssids = 1;
+ goto ssid_list_set;
+ }
+#endif /* CONFIG_P2P */
+
+ /* Find the starting point from which to continue scanning */
ssid = wpa_s->conf->ssid;
- if (wpa_s->prev_scan_ssid != BROADCAST_SSID_SCAN) {
+ if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
while (ssid) {
if (ssid == wpa_s->prev_scan_ssid) {
ssid = ssid->next;
ssid = ssid->next;
}
}
- while (ssid) {
- if (!ssid->disabled &&
- (ssid->scan_ssid || wpa_s->conf->ap_scan == 2))
- break;
- ssid = ssid->next;
- }
if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
+ wpa_s->connect_without_scan = NULL;
+ wpa_s->prev_scan_wildcard = 0;
+ wpa_supplicant_assoc_try(wpa_s, ssid);
+ return;
+ } else if (wpa_s->conf->ap_scan == 2) {
/*
- * ap_scan=2 mode - try to associate with each SSID instead of
- * scanning for each scan_ssid=1 network.
+ * User-initiated scan request in ap_scan == 2; scan with
+ * wildcard SSID.
*/
- if (ssid == NULL) {
- wpa_printf(MSG_DEBUG, "wpa_supplicant_scan: Reached "
- "end of scan list - go back to beginning");
- wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
- wpa_supplicant_req_scan(wpa_s, 0, 0);
- return;
+ ssid = NULL;
+ } else {
+ struct wpa_ssid *start = ssid, *tssid;
+ int freqs_set = 0;
+ if (ssid == NULL && max_ssids > 1)
+ ssid = wpa_s->conf->ssid;
+ while (ssid) {
+ if (!wpas_network_disabled(wpa_s, ssid) &&
+ ssid->scan_ssid) {
+ wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
+ ssid->ssid, ssid->ssid_len);
+ params.ssids[params.num_ssids].ssid =
+ ssid->ssid;
+ params.ssids[params.num_ssids].ssid_len =
+ ssid->ssid_len;
+ params.num_ssids++;
+ if (params.num_ssids + 1 >= max_ssids)
+ break;
+ }
+ ssid = ssid->next;
+ if (ssid == start)
+ break;
+ if (ssid == NULL && max_ssids > 1 &&
+ start != wpa_s->conf->ssid)
+ ssid = wpa_s->conf->ssid;
}
- if (ssid->next) {
- /* Continue from the next SSID on the next attempt. */
- wpa_s->prev_scan_ssid = ssid;
- } else {
- /* Start from the beginning of the SSID list. */
- wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
+
+ for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
+ if (wpas_network_disabled(wpa_s, tssid))
+ continue;
+ if ((params.freqs || !freqs_set) && tssid->scan_freq) {
+ int_array_concat(¶ms.freqs,
+ tssid->scan_freq);
+ } else {
+ os_free(params.freqs);
+ params.freqs = NULL;
+ }
+ freqs_set = 1;
}
- wpa_supplicant_associate(wpa_s, NULL, ssid);
- return;
+ int_array_sort_unique(params.freqs);
}
- wpa_printf(MSG_DEBUG, "Starting AP scan (%s SSID)",
- ssid ? "specific": "broadcast");
- if (ssid) {
- wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
- ssid->ssid, ssid->ssid_len);
+ if (ssid && max_ssids == 1) {
+ /*
+ * If the driver is limited to 1 SSID at a time interleave
+ * wildcard SSID scans with specific SSID scans to avoid
+ * waiting a long time for a wildcard scan.
+ */
+ if (!wpa_s->prev_scan_wildcard) {
+ params.ssids[0].ssid = NULL;
+ params.ssids[0].ssid_len = 0;
+ wpa_s->prev_scan_wildcard = 1;
+ wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
+ "wildcard SSID (Interleave with specific)");
+ } else {
+ wpa_s->prev_scan_ssid = ssid;
+ wpa_s->prev_scan_wildcard = 0;
+ wpa_dbg(wpa_s, MSG_DEBUG,
+ "Starting AP scan for specific SSID: %s",
+ wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
+ }
+ } else if (ssid) {
+ /* max_ssids > 1 */
+
wpa_s->prev_scan_ssid = ssid;
+ wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
+ "the scan request");
+ params.num_ssids++;
+ } else {
+ wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
+ params.num_ssids++;
+ wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
+ "SSID");
+ }
+#ifdef CONFIG_P2P
+ssid_list_set:
+#endif /* CONFIG_P2P */
+
+ wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
+ extra_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms);
+
+#ifdef CONFIG_HS20
+ if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 6) == 0)
+ wpas_hs20_add_indication(extra_ie);
+#endif /* CONFIG_HS20 */
+
+ if (params.freqs == NULL && wpa_s->next_scan_freqs) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
+ "generated frequency list");
+ params.freqs = wpa_s->next_scan_freqs;
} else
- wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
-
- if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
- !wpa_s->use_client_mlme) {
- wpa_s->scan_res_tried++;
- wpa_s->scan_req = scan_req;
- wpa_printf(MSG_DEBUG, "Trying to get current scan results "
- "first without requesting a new scan to speed up "
- "initial association");
- wpa_supplicant_event(wpa_s, EVENT_SCAN_RESULTS, NULL);
- return;
+ os_free(wpa_s->next_scan_freqs);
+ wpa_s->next_scan_freqs = NULL;
+
+ params.filter_ssids = wpa_supplicant_build_filter_ssids(
+ wpa_s->conf, ¶ms.num_filter_ssids);
+ if (extra_ie) {
+ params.extra_ies = wpabuf_head(extra_ie);
+ params.extra_ies_len = wpabuf_len(extra_ie);
}
- if (wpa_s->use_client_mlme) {
- ieee80211_sta_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
- ret = ieee80211_sta_req_scan(wpa_s, ssid ? ssid->ssid : NULL,
- ssid ? ssid->ssid_len : 0);
- } else {
- wpa_drv_set_probe_req_ie(wpa_s, extra_ie, extra_ie_len);
- ret = wpa_drv_scan(wpa_s, ssid ? ssid->ssid : NULL,
- ssid ? ssid->ssid_len : 0);
+#ifdef CONFIG_P2P
+ if (wpa_s->p2p_in_provisioning ||
+ (wpa_s->show_group_started && wpa_s->go_params)) {
+ /*
+ * The interface may not yet be in P2P mode, so we have to
+ * explicitly request P2P probe to disable CCK rates.
+ */
+ params.p2p_probe = 1;
}
+#endif /* CONFIG_P2P */
+
+ scan_params = ¶ms;
+
+scan:
+ ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
+
+ wpabuf_free(extra_ie);
+ os_free(params.freqs);
+ os_free(params.filter_ssids);
if (ret) {
- wpa_printf(MSG_WARNING, "Failed to initiate AP scan.");
- wpa_supplicant_req_scan(wpa_s, 10, 0);
+ wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
+ if (prev_state != wpa_s->wpa_state)
+ wpa_supplicant_set_state(wpa_s, prev_state);
+ wpa_supplicant_req_scan(wpa_s, 1, 0);
}
}
struct wpa_ssid *ssid = wpa_s->conf->ssid;
while (ssid) {
- if (!ssid->disabled && ssid->scan_ssid)
+ if (!wpas_network_disabled(wpa_s, ssid) &&
+ ssid->scan_ssid)
break;
ssid = ssid->next;
}
if (ssid) {
- wpa_msg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
+ wpa_dbg(wpa_s, MSG_DEBUG, "Not rescheduling scan to "
"ensure that specific SSID scans occur");
return;
}
}
- wpa_msg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
+ wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d sec %d usec",
sec, usec);
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
}
+/**
+ * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @sec: Number of seconds after which to scan
+ * @usec: Number of microseconds after which to scan
+ *
+ * This function is used to schedule periodic scans for neighboring
+ * access points after the specified time.
+ */
+int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
+ int sec, int usec)
+{
+ if (!wpa_s->sched_scan_supported)
+ return -1;
+
+ eloop_register_timeout(sec, usec,
+ wpa_supplicant_delayed_sched_scan_timeout,
+ wpa_s, NULL);
+
+ return 0;
+}
+
+
+/**
+ * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to schedule periodic scans for neighboring
+ * access points repeating the scan continuously.
+ */
+int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_driver_scan_params params;
+ struct wpa_driver_scan_params *scan_params;
+ enum wpa_states prev_state;
+ struct wpa_ssid *ssid = NULL;
+ struct wpabuf *wps_ie = NULL;
+ int ret;
+ unsigned int max_sched_scan_ssids;
+ int wildcard = 0;
+ int need_ssids;
+
+ if (!wpa_s->sched_scan_supported)
+ return -1;
+
+ if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
+ max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
+ else
+ max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
+ if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
+ return -1;
+
+ if (wpa_s->sched_scanning) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
+ return 0;
+ }
+
+ need_ssids = 0;
+ for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+ if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
+ /* Use wildcard SSID to find this network */
+ wildcard = 1;
+ } else if (!wpas_network_disabled(wpa_s, ssid) &&
+ ssid->ssid_len)
+ need_ssids++;
+
+#ifdef CONFIG_WPS
+ if (!wpas_network_disabled(wpa_s, ssid) &&
+ ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
+ /*
+ * Normal scan is more reliable and faster for WPS
+ * operations and since these are for short periods of
+ * time, the benefit of trying to use sched_scan would
+ * be limited.
+ */
+ wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
+ "sched_scan for WPS");
+ return -1;
+ }
+#endif /* CONFIG_WPS */
+ }
+ if (wildcard)
+ need_ssids++;
+
+ if (wpa_s->normal_scans < 3 &&
+ (need_ssids <= wpa_s->max_scan_ssids ||
+ wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
+ /*
+ * When normal scan can speed up operations, use that for the
+ * first operations before starting the sched_scan to allow
+ * user space sleep more. We do this only if the normal scan
+ * has functionality that is suitable for this or if the
+ * sched_scan does not have better support for multiple SSIDs.
+ */
+ wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
+ "sched_scan for initial scans (normal_scans=%d)",
+ wpa_s->normal_scans);
+ return -1;
+ }
+
+ os_memset(¶ms, 0, sizeof(params));
+
+ /* If we can't allocate space for the filters, we just don't filter */
+ params.filter_ssids = os_zalloc(wpa_s->max_match_sets *
+ sizeof(struct wpa_driver_scan_filter));
+
+ prev_state = wpa_s->wpa_state;
+ if (wpa_s->wpa_state == WPA_DISCONNECTED ||
+ wpa_s->wpa_state == WPA_INACTIVE)
+ wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
+
+ if (wpa_s->autoscan_params != NULL) {
+ scan_params = wpa_s->autoscan_params;
+ goto scan;
+ }
+
+ /* Find the starting point from which to continue scanning */
+ ssid = wpa_s->conf->ssid;
+ if (wpa_s->prev_sched_ssid) {
+ while (ssid) {
+ if (ssid == wpa_s->prev_sched_ssid) {
+ ssid = ssid->next;
+ break;
+ }
+ ssid = ssid->next;
+ }
+ }
+
+ if (!ssid || !wpa_s->prev_sched_ssid) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
+
+ if (wpa_s->sched_scan_interval == 0)
+ wpa_s->sched_scan_interval = 10;
+ wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
+ wpa_s->first_sched_scan = 1;
+ ssid = wpa_s->conf->ssid;
+ wpa_s->prev_sched_ssid = ssid;
+ }
+
+ if (wildcard) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
+ params.num_ssids++;
+ }
+
+ while (ssid) {
+ if (wpas_network_disabled(wpa_s, ssid))
+ goto next;
+
+ if (params.num_filter_ssids < wpa_s->max_match_sets &&
+ params.filter_ssids && ssid->ssid && ssid->ssid_len) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
+ wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
+ os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
+ ssid->ssid, ssid->ssid_len);
+ params.filter_ssids[params.num_filter_ssids].ssid_len =
+ ssid->ssid_len;
+ params.num_filter_ssids++;
+ } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
+ {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
+ "filter for sched_scan - drop filter");
+ os_free(params.filter_ssids);
+ params.filter_ssids = NULL;
+ params.num_filter_ssids = 0;
+ }
+
+ if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
+ if (params.num_ssids == max_sched_scan_ssids)
+ break; /* only room for broadcast SSID */
+ wpa_dbg(wpa_s, MSG_DEBUG,
+ "add to active scan ssid: %s",
+ wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
+ params.ssids[params.num_ssids].ssid =
+ ssid->ssid;
+ params.ssids[params.num_ssids].ssid_len =
+ ssid->ssid_len;
+ params.num_ssids++;
+ if (params.num_ssids >= max_sched_scan_ssids) {
+ wpa_s->prev_sched_ssid = ssid;
+ do {
+ ssid = ssid->next;
+ } while (ssid &&
+ (wpas_network_disabled(wpa_s, ssid) ||
+ !ssid->scan_ssid));
+ break;
+ }
+ }
+
+ next:
+ wpa_s->prev_sched_ssid = ssid;
+ ssid = ssid->next;
+ }
+
+ if (params.num_filter_ssids == 0) {
+ os_free(params.filter_ssids);
+ params.filter_ssids = NULL;
+ }
+
+ if (wpa_s->wps)
+ wps_ie = wpa_supplicant_extra_ies(wpa_s, ¶ms);
+
+ scan_params = ¶ms;
+
+scan:
+ if (ssid || !wpa_s->first_sched_scan) {
+ wpa_dbg(wpa_s, MSG_DEBUG,
+ "Starting sched scan: interval %d timeout %d",
+ wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
+ } else {
+ wpa_dbg(wpa_s, MSG_DEBUG,
+ "Starting sched scan: interval %d (no timeout)",
+ wpa_s->sched_scan_interval);
+ }
+
+ ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
+ wpa_s->sched_scan_interval);
+ wpabuf_free(wps_ie);
+ os_free(params.filter_ssids);
+ if (ret) {
+ wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
+ if (prev_state != wpa_s->wpa_state)
+ wpa_supplicant_set_state(wpa_s, prev_state);
+ return ret;
+ }
+
+ /* If we have more SSIDs to scan, add a timeout so we scan them too */
+ if (ssid || !wpa_s->first_sched_scan) {
+ wpa_s->sched_scan_timed_out = 0;
+ eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
+ wpa_supplicant_sched_scan_timeout,
+ wpa_s, NULL);
+ wpa_s->first_sched_scan = 0;
+ wpa_s->sched_scan_timeout /= 2;
+ wpa_s->sched_scan_interval *= 2;
+ }
+
+ return 0;
+}
+
+
/**
* wpa_supplicant_cancel_scan - Cancel a scheduled scan request
* @wpa_s: Pointer to wpa_supplicant data
*/
void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
{
- wpa_msg(wpa_s, MSG_DEBUG, "Cancelling scan request");
+ wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
}
+
+
+/**
+ * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to stop a periodic scheduled scan.
+ */
+void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
+{
+ if (!wpa_s->sched_scanning)
+ return;
+
+ wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
+ eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
+ wpa_supplicant_stop_sched_scan(wpa_s);
+}
+
+
+void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
+ int scanning)
+{
+ if (wpa_s->scanning != scanning) {
+ wpa_s->scanning = scanning;
+ wpas_notify_scanning(wpa_s);
+ }
+}
+
+
+static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
+{
+ int rate = 0;
+ const u8 *ie;
+ int i;
+
+ ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
+ for (i = 0; ie && i < ie[1]; i++) {
+ if ((ie[i + 2] & 0x7f) > rate)
+ rate = ie[i + 2] & 0x7f;
+ }
+
+ ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
+ for (i = 0; ie && i < ie[1]; i++) {
+ if ((ie[i + 2] & 0x7f) > rate)
+ rate = ie[i + 2] & 0x7f;
+ }
+
+ return rate;
+}
+
+
+const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
+{
+ const u8 *end, *pos;
+
+ pos = (const u8 *) (res + 1);
+ end = pos + res->ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == ie)
+ return pos;
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+
+const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
+ u32 vendor_type)
+{
+ const u8 *end, *pos;
+
+ pos = (const u8 *) (res + 1);
+ end = pos + res->ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+ vendor_type == WPA_GET_BE32(&pos[2]))
+ return pos;
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+
+struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
+ u32 vendor_type)
+{
+ struct wpabuf *buf;
+ const u8 *end, *pos;
+
+ buf = wpabuf_alloc(res->ie_len);
+ if (buf == NULL)
+ return NULL;
+
+ pos = (const u8 *) (res + 1);
+ end = pos + res->ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+ vendor_type == WPA_GET_BE32(&pos[2]))
+ wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
+ pos += 2 + pos[1];
+ }
+
+ if (wpabuf_len(buf) == 0) {
+ wpabuf_free(buf);
+ buf = NULL;
+ }
+
+ return buf;
+}
+
+
+struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon(
+ const struct wpa_scan_res *res, u32 vendor_type)
+{
+ struct wpabuf *buf;
+ const u8 *end, *pos;
+
+ if (res->beacon_ie_len == 0)
+ return NULL;
+ buf = wpabuf_alloc(res->beacon_ie_len);
+ if (buf == NULL)
+ return NULL;
+
+ pos = (const u8 *) (res + 1);
+ pos += res->ie_len;
+ end = pos + res->beacon_ie_len;
+
+ while (pos + 1 < end) {
+ if (pos + 2 + pos[1] > end)
+ break;
+ if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+ vendor_type == WPA_GET_BE32(&pos[2]))
+ wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
+ pos += 2 + pos[1];
+ }
+
+ if (wpabuf_len(buf) == 0) {
+ wpabuf_free(buf);
+ buf = NULL;
+ }
+
+ return buf;
+}
+
+
+/*
+ * Channels with a great SNR can operate at full rate. What is a great SNR?
+ * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
+ * rule of thumb is that any SNR above 20 is good." This one
+ * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
+ * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
+ * conservative value.
+ */
+#define GREAT_SNR 30
+
+/* Compare function for sorting scan results. Return >0 if @b is considered
+ * better. */
+static int wpa_scan_result_compar(const void *a, const void *b)
+{
+#define IS_5GHZ(n) (n > 4000)
+#define MIN(a,b) a < b ? a : b
+ struct wpa_scan_res **_wa = (void *) a;
+ struct wpa_scan_res **_wb = (void *) b;
+ struct wpa_scan_res *wa = *_wa;
+ struct wpa_scan_res *wb = *_wb;
+ int wpa_a, wpa_b, maxrate_a, maxrate_b;
+ int snr_a, snr_b;
+
+ /* WPA/WPA2 support preferred */
+ wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
+ wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
+ wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
+ wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
+
+ if (wpa_b && !wpa_a)
+ return 1;
+ if (!wpa_b && wpa_a)
+ return -1;
+
+ /* privacy support preferred */
+ if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
+ (wb->caps & IEEE80211_CAP_PRIVACY))
+ return 1;
+ if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
+ (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
+ return -1;
+
+ if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) &&
+ !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) {
+ snr_a = MIN(wa->level - wa->noise, GREAT_SNR);
+ snr_b = MIN(wb->level - wb->noise, GREAT_SNR);
+ } else {
+ /* Not suitable information to calculate SNR, so use level */
+ snr_a = wa->level;
+ snr_b = wb->level;
+ }
+
+ /* best/max rate preferred if SNR close enough */
+ if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
+ (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
+ maxrate_a = wpa_scan_get_max_rate(wa);
+ maxrate_b = wpa_scan_get_max_rate(wb);
+ if (maxrate_a != maxrate_b)
+ return maxrate_b - maxrate_a;
+ if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
+ return IS_5GHZ(wa->freq) ? -1 : 1;
+ }
+
+ /* use freq for channel preference */
+
+ /* all things being equal, use SNR; if SNRs are
+ * identical, use quality values since some drivers may only report
+ * that value and leave the signal level zero */
+ if (snr_b == snr_a)
+ return wb->qual - wa->qual;
+ return snr_b - snr_a;
+#undef MIN
+#undef IS_5GHZ
+}
+
+
+#ifdef CONFIG_WPS
+/* Compare function for sorting scan results when searching a WPS AP for
+ * provisioning. Return >0 if @b is considered better. */
+static int wpa_scan_result_wps_compar(const void *a, const void *b)
+{
+ struct wpa_scan_res **_wa = (void *) a;
+ struct wpa_scan_res **_wb = (void *) b;
+ struct wpa_scan_res *wa = *_wa;
+ struct wpa_scan_res *wb = *_wb;
+ int uses_wps_a, uses_wps_b;
+ struct wpabuf *wps_a, *wps_b;
+ int res;
+
+ /* Optimization - check WPS IE existence before allocated memory and
+ * doing full reassembly. */
+ uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
+ uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
+ if (uses_wps_a && !uses_wps_b)
+ return -1;
+ if (!uses_wps_a && uses_wps_b)
+ return 1;
+
+ if (uses_wps_a && uses_wps_b) {
+ wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
+ wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
+ res = wps_ap_priority_compar(wps_a, wps_b);
+ wpabuf_free(wps_a);
+ wpabuf_free(wps_b);
+ if (res)
+ return res;
+ }
+
+ /*
+ * Do not use current AP security policy as a sorting criteria during
+ * WPS provisioning step since the AP may get reconfigured at the
+ * completion of provisioning.
+ */
+
+ /* all things being equal, use signal level; if signal levels are
+ * identical, use quality values since some drivers may only report
+ * that value and leave the signal level zero */
+ if (wb->level == wa->level)
+ return wb->qual - wa->qual;
+ return wb->level - wa->level;
+}
+#endif /* CONFIG_WPS */
+
+
+static void dump_scan_res(struct wpa_scan_results *scan_res)
+{
+#ifndef CONFIG_NO_STDOUT_DEBUG
+ size_t i;
+
+ if (scan_res->res == NULL || scan_res->num == 0)
+ return;
+
+ wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
+
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *r = scan_res->res[i];
+ u8 *pos;
+ if ((r->flags & (WPA_SCAN_LEVEL_DBM | WPA_SCAN_NOISE_INVALID))
+ == WPA_SCAN_LEVEL_DBM) {
+ int snr = r->level - r->noise;
+ wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
+ "noise=%d level=%d snr=%d%s flags=0x%x",
+ MAC2STR(r->bssid), r->freq, r->qual,
+ r->noise, r->level, snr,
+ snr >= GREAT_SNR ? "*" : "", r->flags);
+ } else {
+ wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
+ "noise=%d level=%d flags=0x%x",
+ MAC2STR(r->bssid), r->freq, r->qual,
+ r->noise, r->level, r->flags);
+ }
+ pos = (u8 *) (r + 1);
+ if (r->ie_len)
+ wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
+ pos += r->ie_len;
+ if (r->beacon_ie_len)
+ wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
+ pos, r->beacon_ie_len);
+ }
+#endif /* CONFIG_NO_STDOUT_DEBUG */
+}
+
+
+int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
+ const u8 *bssid)
+{
+ size_t i;
+
+ if (wpa_s->bssid_filter == NULL)
+ return 1;
+
+ for (i = 0; i < wpa_s->bssid_filter_count; i++) {
+ if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
+ ETH_ALEN) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static void filter_scan_res(struct wpa_supplicant *wpa_s,
+ struct wpa_scan_results *res)
+{
+ size_t i, j;
+
+ if (wpa_s->bssid_filter == NULL)
+ return;
+
+ for (i = 0, j = 0; i < res->num; i++) {
+ if (wpa_supplicant_filter_bssid_match(wpa_s,
+ res->res[i]->bssid)) {
+ res->res[j++] = res->res[i];
+ } else {
+ os_free(res->res[i]);
+ res->res[i] = NULL;
+ }
+ }
+
+ if (res->num != j) {
+ wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
+ (int) (res->num - j));
+ res->num = j;
+ }
+}
+
+
+/**
+ * wpa_supplicant_get_scan_results - Get scan results
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @info: Information about what was scanned or %NULL if not available
+ * @new_scan: Whether a new scan was performed
+ * Returns: Scan results, %NULL on failure
+ *
+ * This function request the current scan results from the driver and updates
+ * the local BSS list wpa_s->bss. The caller is responsible for freeing the
+ * results with wpa_scan_results_free().
+ */
+struct wpa_scan_results *
+wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
+ struct scan_info *info, int new_scan)
+{
+ struct wpa_scan_results *scan_res;
+ size_t i;
+ int (*compar)(const void *, const void *) = wpa_scan_result_compar;
+
+ scan_res = wpa_drv_get_scan_results2(wpa_s);
+ if (scan_res == NULL) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
+ return NULL;
+ }
+ filter_scan_res(wpa_s, scan_res);
+
+#ifdef CONFIG_WPS
+ if (wpas_wps_in_progress(wpa_s)) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
+ "provisioning rules");
+ compar = wpa_scan_result_wps_compar;
+ }
+#endif /* CONFIG_WPS */
+
+ qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
+ compar);
+ dump_scan_res(scan_res);
+
+ wpa_bss_update_start(wpa_s);
+ for (i = 0; i < scan_res->num; i++)
+ wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
+ wpa_bss_update_end(wpa_s, info, new_scan);
+
+ return scan_res;
+}
+
+
+int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
+{
+ struct wpa_scan_results *scan_res;
+ scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
+ if (scan_res == NULL)
+ return -1;
+ wpa_scan_results_free(scan_res);
+
+ return 0;
+}
projects / thirdparty / hostap.git / blobdiff