/*
* WPA Supplicant - Scanning
- * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
+#include "common/wpa_ctrl.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#endif /* CONFIG_WPS */
+/**
+ * wpa_supplicant_enabled_networks - Check whether there are enabled networks
+ * @wpa_s: Pointer to wpa_supplicant data
+ * Returns: 0 if no networks are enabled, >0 if networks are enabled
+ *
+ * This function is used to figure out whether any networks (or Interworking
+ * with enabled credentials and auto_interworking) are present in the current
+ * configuration.
+ */
int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid = wpa_s->conf->ssid;
}
+/**
+ * wpa_supplicant_trigger_scan - Request driver to start a scan
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @params: Scan parameters
+ * Returns: 0 on success, -1 on failure
+ */
int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
struct wpa_driver_scan_params *params)
{
wpa_supplicant_notify_scanning(wpa_s, 0);
wpas_notify_scan_done(wpa_s, 0);
} else {
+ os_get_time(&wpa_s->scan_trigger_time);
wpa_s->scan_runs++;
wpa_s->normal_scans++;
}
#endif /* CONFIG_WPS */
+#ifdef CONFIG_HS20
+ if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
+ wpas_hs20_add_indication(extra_ie);
+#endif /* CONFIG_HS20 */
+
return extra_ie;
}
return 0;
}
+#endif /* CONFIG_P2P */
-/*
- * Find the operating frequency of any other virtual interface that is using
- * the same radio concurrently.
- */
-static int shared_vif_oper_freq(struct wpa_supplicant *wpa_s)
+
+static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
+ u16 num_modes,
+ enum hostapd_hw_mode mode)
{
- const char *rn, *rn2;
- struct wpa_supplicant *ifs;
- u8 bssid[ETH_ALEN];
+ u16 i;
- if (!wpa_s->driver->get_radio_name)
- return -1;
+ for (i = 0; i < num_modes; i++) {
+ if (modes[i].mode == mode)
+ return &modes[i];
+ }
- rn = wpa_s->driver->get_radio_name(wpa_s->drv_priv);
- if (rn == NULL || rn[0] == '\0')
- return -1;
+ return NULL;
+}
- for (ifs = wpa_s->global->ifaces; ifs; ifs = ifs->next) {
- if (ifs == wpa_s || !ifs->driver->get_radio_name)
- continue;
- rn2 = ifs->driver->get_radio_name(ifs->drv_priv);
- if (!rn2 || os_strcmp(rn, rn2) != 0)
- continue;
+static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
+ enum hostapd_hw_mode band,
+ struct wpa_driver_scan_params *params)
+{
+ /* Include only supported channels for the specified band */
+ struct hostapd_hw_modes *mode;
+ int count, i;
+
+ mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
+ if (mode == NULL) {
+ /* No channels supported in this band - use empty list */
+ params->freqs = os_zalloc(sizeof(int));
+ return;
+ }
- if (ifs->current_ssid == NULL || ifs->assoc_freq == 0)
+ params->freqs = os_zalloc((mode->num_channels + 1) * sizeof(int));
+ if (params->freqs == NULL)
+ return;
+ for (count = 0, i = 0; i < mode->num_channels; i++) {
+ if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
continue;
-
- if (ifs->current_ssid->mode == WPAS_MODE_AP ||
- ifs->current_ssid->mode == WPAS_MODE_P2P_GO)
- return ifs->current_ssid->frequency;
- if (wpa_drv_get_bssid(ifs, bssid) == 0)
- return ifs->assoc_freq;
+ params->freqs[count++] = mode->channels[i].freq;
}
-
- return 0;
}
-#endif /* CONFIG_P2P */
+
+static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
+ struct wpa_driver_scan_params *params)
+{
+ if (wpa_s->hw.modes == NULL)
+ return; /* unknown what channels the driver supports */
+ if (params->freqs)
+ return; /* already using a limited channel set */
+ if (wpa_s->setband == WPA_SETBAND_5G)
+ wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
+ params);
+ else if (wpa_s->setband == WPA_SETBAND_2G)
+ wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
+ params);
+}
static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
+ wpas_p2p_continue_after_scan(wpa_s);
return;
}
if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
+ wpas_p2p_continue_after_scan(wpa_s);
return;
}
wpa_s->scan_req == NORMAL_SCAN_REQ) {
wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
-#ifdef CONFIG_P2P
- wpa_s->sta_scan_pending = 0;
-#endif /* CONFIG_P2P */
+ wpas_p2p_continue_after_scan(wpa_s);
return;
}
}
#ifdef CONFIG_P2P
- if (wpas_p2p_in_progress(wpa_s)) {
+ if (wpas_p2p_in_progress(wpa_s) || wpas_wpa_is_in_progress(wpa_s, 0)) {
if (wpa_s->sta_scan_pending &&
wpas_p2p_in_progress(wpa_s) == 2 &&
wpa_s->global->p2p_cb_on_scan_complete) {
wpa_supplicant_optimize_freqs(wpa_s, ¶ms);
extra_ie = wpa_supplicant_extra_ies(wpa_s);
-#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");
} else
os_free(wpa_s->next_scan_freqs);
wpa_s->next_scan_freqs = NULL;
+ wpa_setband_scan_freqs(wpa_s, ¶ms);
+
+ /* See if user specified frequencies. If so, scan only those. */
+ if (wpa_s->conf->freq_list && !params.freqs) {
+ wpa_dbg(wpa_s, MSG_DEBUG,
+ "Optimize scan based on conf->freq_list");
+ int_array_concat(¶ms.freqs, wpa_s->conf->freq_list);
+ }
+
+ /* Use current associated channel? */
+ if (wpa_s->conf->scan_cur_freq && !params.freqs) {
+ unsigned int num = wpa_s->num_multichan_concurrent;
+
+ params.freqs = os_calloc(num + 1, sizeof(int));
+ if (params.freqs) {
+ num = get_shared_radio_freqs(wpa_s, params.freqs, num);
+ if (num > 0) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
+ "current operating channels since "
+ "scan_cur_freq is enabled");
+ } else {
+ os_free(params.freqs);
+ params.freqs = NULL;
+ }
+ }
+ }
params.filter_ssids = wpa_supplicant_build_filter_ssids(
wpa_s->conf, ¶ms.num_filter_ssids);
if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ &&
!scan_params->freqs && !params.freqs &&
wpas_is_p2p_prioritized(wpa_s) &&
- !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) &&
wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
non_p2p_network_enabled(wpa_s)) {
- int freq = shared_vif_oper_freq(wpa_s);
- if (freq > 0) {
- wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only the current "
- "operating channel (%d MHz) since driver does "
- "not support multi-channel concurrency", freq);
- params.freqs = os_zalloc(sizeof(int) * 2);
- if (params.freqs)
- params.freqs[0] = freq;
- scan_params->freqs = params.freqs;
+ unsigned int num = wpa_s->num_multichan_concurrent;
+
+ params.freqs = os_calloc(num + 1, sizeof(int));
+ if (params.freqs) {
+ num = get_shared_radio_freqs(wpa_s, params.freqs, num);
+ if (num > 0 && num == wpa_s->num_multichan_concurrent) {
+ wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
+ } else {
+ os_free(params.freqs);
+ params.freqs = NULL;
+ }
}
}
#endif /* CONFIG_P2P */
}
+void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
+{
+ struct os_time remaining, new_int;
+ int cancelled;
+
+ cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
+ &remaining);
+
+ new_int.sec = sec;
+ new_int.usec = 0;
+ if (cancelled && os_time_before(&remaining, &new_int)) {
+ new_int.sec = remaining.sec;
+ new_int.usec = remaining.usec;
+ }
+
+ eloop_register_timeout(new_int.sec, new_int.usec, wpa_supplicant_scan,
+ wpa_s, NULL);
+ wpa_s->scan_interval = sec;
+}
+
+
/**
* wpa_supplicant_req_scan - Schedule a scan for neighboring access points
* @wpa_s: Pointer to wpa_supplicant data
* @wpa_s: Pointer to wpa_supplicant data
* @sec: Number of seconds after which to scan
* @usec: Number of microseconds after which to scan
+ * Returns: 0 on success or -1 otherwise
*
* This function is used to schedule periodic scans for neighboring
* access points after the specified time.
/**
* wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
* @wpa_s: Pointer to wpa_supplicant data
+ * Returns: 0 is sched_scan was started or -1 otherwise
*
* This function is used to schedule periodic scans for neighboring
* access points repeating the scan continuously.
if (!ssid || !wpa_s->prev_sched_ssid) {
wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
-
+ if (wpa_s->conf->sched_scan_interval)
+ wpa_s->sched_scan_interval =
+ wpa_s->conf->sched_scan_interval;
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->sched_scan_interval);
}
+ wpa_setband_scan_freqs(wpa_s, scan_params);
+
ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
wpa_s->sched_scan_interval);
wpabuf_free(extra_ie);
wpa_s->first_sched_scan = 0;
wpa_s->sched_scan_timeout /= 2;
wpa_s->sched_scan_interval *= 2;
+ if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
+ wpa_s->sched_scan_interval = 10;
+ wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
+ }
}
+ /* If there is no more ssids, start next time from the beginning */
+ if (!ssid)
+ wpa_s->prev_sched_ssid = NULL;
+
return 0;
}
{
wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
+ wpas_p2p_continue_after_scan(wpa_s);
+}
+
+
+/**
+ * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
+ * @wpa_s: Pointer to wpa_supplicant data
+ *
+ * This function is used to stop a delayed scheduled scan.
+ */
+void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
+{
+ if (!wpa_s->sched_scan_supported)
+ return;
+
+ wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
+ eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
+ wpa_s, NULL);
}
}
+/**
+ * wpa_supplicant_notify_scanning - Indicate possible scan state change
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @scanning: Whether scanning is currently in progress
+ *
+ * This function is to generate scanning notifycations. It is called whenever
+ * there may have been a change in scanning (scan started, completed, stopped).
+ * wpas_notify_scanning() is called whenever the scanning state changed from the
+ * previously notified state.
+ */
void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
int scanning)
{
}
+/**
+ * wpa_scan_get_ie - Fetch a specified information element from a scan result
+ * @res: Scan result entry
+ * @ie: Information element identitifier (WLAN_EID_*)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the scan
+ * result.
+ */
const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
{
const u8 *end, *pos;
}
+/**
+ * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
+ * @res: Scan result entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the scan
+ * result.
+ */
const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
u32 vendor_type)
{
}
-struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
- u32 vendor_type)
+/**
+ * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
+ * @res: Scan result entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the scan
+ * result.
+ *
+ * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
+ * from Beacon frames instead of either Beacon or Probe Response frames.
+ */
+const u8 * wpa_scan_get_vendor_ie_beacon(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)
+ if (res->beacon_ie_len == 0)
return NULL;
pos = (const u8 *) (res + 1);
- end = pos + res->ie_len;
+ 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);
+ return pos;
pos += 2 + pos[1];
}
- if (wpabuf_len(buf) == 0) {
- wpabuf_free(buf);
- buf = NULL;
- }
-
- return buf;
+ return NULL;
}
-struct wpabuf * wpa_scan_get_vendor_ie_multi_beacon(
- const struct wpa_scan_res *res, u32 vendor_type)
+/**
+ * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
+ * @res: Scan result entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element payload or %NULL if not found
+ *
+ * This function returns concatenated payload of possibly fragmented vendor
+ * specific information elements in the scan result. The caller is responsible
+ * for freeing the returned buffer.
+ */
+struct wpabuf * wpa_scan_get_vendor_ie_multi(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);
+ buf = wpabuf_alloc(res->ie_len);
if (buf == NULL)
return NULL;
pos = (const u8 *) (res + 1);
- pos += res->ie_len;
- end = pos + res->beacon_ie_len;
+ end = pos + res->ie_len;
while (pos + 1 < end) {
if (pos + 2 + pos[1] > end)
== 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",
+ "noise=%d level=%d snr=%d%s flags=0x%x "
+ "age=%u",
MAC2STR(r->bssid), r->freq, r->qual,
r->noise, r->level, snr,
- snr >= GREAT_SNR ? "*" : "", r->flags);
+ snr >= GREAT_SNR ? "*" : "", r->flags,
+ r->age);
} else {
wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
- "noise=%d level=%d flags=0x%x",
+ "noise=%d level=%d flags=0x%x age=%u",
MAC2STR(r->bssid), r->freq, r->qual,
- r->noise, r->level, r->flags);
+ r->noise, r->level, r->flags, r->age);
}
pos = (u8 *) (r + 1);
if (r->ie_len)
}
+/**
+ * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
+ * @wpa_s: Pointer to wpa_supplicant data
+ * @bssid: BSSID to check
+ * Returns: 0 if the BSSID is filtered or 1 if not
+ *
+ * This function is used to filter out specific BSSIDs from scan reslts mainly
+ * for testing purposes (SET bssid_filter ctrl_iface command).
+ */
int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
const u8 *bssid)
{
wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
return NULL;
}
+ if (scan_res->fetch_time.sec == 0) {
+ /*
+ * Make sure we have a valid timestamp if the driver wrapper
+ * does not set this.
+ */
+ os_get_time(&scan_res->fetch_time);
+ }
filter_scan_res(wpa_s, scan_res);
#ifdef CONFIG_WPS
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_scan_res(wpa_s, scan_res->res[i],
+ &scan_res->fetch_time);
wpa_bss_update_end(wpa_s, info, new_scan);
return scan_res;
}
+/**
+ * wpa_supplicant_update_scan_results - Update scan results from the driver
+ * @wpa_s: Pointer to wpa_supplicant data
+ * Returns: 0 on success, -1 on failure
+ *
+ * This function updates the BSS table within wpa_supplicant based on the
+ * currently available scan results from the driver without requesting a new
+ * scan. This is used in cases where the driver indicates an association
+ * (including roaming within ESS) and wpa_supplicant does not yet have the
+ * needed information to complete the connection (e.g., to perform validation
+ * steps in 4-way handshake).
+ */
int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
{
struct wpa_scan_results *scan_res;
return 0;
}
+
+
+/**
+ * scan_only_handler - Reports scan results
+ */
+void scan_only_handler(struct wpa_supplicant *wpa_s,
+ struct wpa_scan_results *scan_res)
+{
+ wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
+ wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
+ wpas_notify_scan_results(wpa_s);
+ wpas_notify_scan_done(wpa_s, 1);
+}
+
+
+int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
+{
+ return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
+}
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