/*
* 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
* See README and COPYING 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 "driver_i.h"
#include "mlme.h"
#include "wps_supplicant.h"
-#include "ctrl_iface_dbus.h"
+#include "p2p_supplicant.h"
+#include "p2p/p2p.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");
#endif /* CONFIG_WPS */
-static int wpa_supplicant_enabled_networks(struct wpa_config *conf)
+int wpa_supplicant_enabled_networks(struct wpa_config *conf)
{
struct wpa_ssid *ssid = conf->ssid;
while (ssid) {
if (n == NULL) {
os_free(*res);
*res = NULL;
+ return;
}
for (i = 0; i <= alen; i++)
n[reslen + i] = a[i];
}
+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);
+
+ if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
+ ret = ieee80211_sta_req_scan(wpa_s, params);
+ else
+ 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++;
+
+ 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_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 *wps_ie = NULL;
- int wps = 0;
#ifdef CONFIG_WPS
+ int wps = 0;
enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
#endif /* CONFIG_WPS */
struct wpa_driver_scan_params params;
size_t max_ssids;
+ enum wpa_states prev_state;
- if (wpa_s->disconnected && !wpa_s->scan_req)
+ if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
+ wpa_printf(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->conf) &&
!wpa_s->scan_req) {
wpa_printf(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) {
wps = wpas_wps_in_use(wpa_s->conf, &req_type);
#endif /* CONFIG_WPS */
- if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
- !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) &&
- wps != 2) {
- wpa_s->scan_res_tried++;
- 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;
- }
-
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 (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
+ if (scan_req != 2 && (wpa_s->conf->ap_scan == 2 ||
+ wpa_s->connect_without_scan)) {
+ wpa_s->connect_without_scan = 0;
wpa_supplicant_assoc_try(wpa_s, ssid);
return;
} else if (wpa_s->conf->ap_scan == 2) {
*/
ssid = NULL;
} else {
- struct wpa_ssid *start = ssid;
+ struct wpa_ssid *start = ssid, *tssid;
int freqs_set = 0;
if (ssid == NULL && max_ssids > 1)
ssid = wpa_s->conf->ssid;
ssid = wpa_s->conf->ssid;
}
- for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
- if (ssid->disabled)
+ for (tssid = wpa_s->conf->ssid; tssid; tssid = tssid->next) {
+ if (tssid->disabled)
continue;
- if ((params.freqs || !freqs_set) && ssid->scan_freq) {
+ if ((params.freqs || !freqs_set) && tssid->scan_freq) {
int_array_concat(¶ms.freqs,
- ssid->scan_freq);
+ tssid->scan_freq);
} else {
os_free(params.freqs);
params.freqs = NULL;
wpa_printf(MSG_DEBUG, "Starting AP scan for wildcard SSID");
}
+#ifdef CONFIG_P2P
+ wpa_s->wps->dev.p2p = 1;
+ if (!wps) {
+ wps = 1;
+ req_type = WPS_REQ_ENROLLEE_INFO;
+ }
+
+ 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_printf(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->go_params->freq_list[0]) {
+ wpa_printf(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_printf(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 (wps) {
wps_ie = wps_build_probe_req_ie(wps == 2, &wpa_s->wps->dev,
wpa_s->wps->uuid, req_type);
}
#endif /* CONFIG_WPS */
- wpa_supplicant_notify_scanning(wpa_s, 1);
-
- if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) {
- ieee80211_sta_set_probe_req_ie(wpa_s, params.extra_ies,
- params.extra_ies_len);
- ret = ieee80211_sta_req_scan(wpa_s, params.ssids[0].ssid,
- params.ssids[0].ssid_len);
- } else {
- wpa_drv_set_probe_req_ie(wpa_s, params.extra_ies,
- params.extra_ies_len);
- ret = wpa_drv_scan(wpa_s, ¶ms);
+#ifdef CONFIG_P2P
+ if (wps_ie) {
+ if (wpabuf_resize(&wps_ie, 100) == 0) {
+ wpas_p2p_scan_ie(wpa_s, wps_ie);
+ params.extra_ies = wpabuf_head(wps_ie);
+ params.extra_ies_len = wpabuf_len(wps_ie);
+ }
}
+#endif /* CONFIG_P2P */
+
+ params.filter_ssids = wpa_supplicant_build_filter_ssids(
+ wpa_s->conf, ¶ms.num_filter_ssids);
+
+ ret = wpa_supplicant_trigger_scan(wpa_s, ¶ms);
wpabuf_free(wps_ie);
os_free(params.freqs);
+ os_free(params.filter_ssids);
if (ret) {
wpa_printf(MSG_WARNING, "Failed to initiate AP scan.");
- wpa_supplicant_notify_scanning(wpa_s, 0);
- wpa_supplicant_req_scan(wpa_s, 10, 0);
- } else
- wpa_s->scan_runs++;
+ if (prev_state != wpa_s->wpa_state)
+ wpa_supplicant_set_state(wpa_s, prev_state);
+ wpa_supplicant_req_scan(wpa_s, 1, 0);
+ }
}
{
if (wpa_s->scanning != scanning) {
wpa_s->scanning = scanning;
- wpa_supplicant_dbus_notify_scanning(wpa_s);
+ 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;
}
+
+/* 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)
+{
+ 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;
+
+ /* 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;
+
+ /* best/max rate preferred if signal level close enough XXX */
+ if ((wa->level && wb->level && abs(wb->level - wa->level) < 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;
+ }
+
+ /* use freq for channel preference */
+
+ /* 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;
+}
+
+
+#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 */
+
+
+/**
+ * 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;
+
+ if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
+ scan_res = ieee80211_sta_get_scan_results(wpa_s);
+ else
+ scan_res = wpa_drv_get_scan_results2(wpa_s);
+ if (scan_res == NULL) {
+ wpa_printf(MSG_DEBUG, "Failed to get scan results");
+ return NULL;
+ }
+
+#ifdef CONFIG_WPS
+ if (wpas_wps_in_progress(wpa_s)) {
+ wpa_printf(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);
+
+ 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;
+}
+
+
+void wpa_scan_results_free(struct wpa_scan_results *res)
+{
+ size_t i;
+
+ if (res == NULL)
+ return;
+
+ for (i = 0; i < res->num; i++)
+ os_free(res->res[i]);
+ os_free(res->res);
+ os_free(res);
+}
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