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📄 Android.mk(36.85 KB)
📄 ChangeLog(127.25 KB)
📄 README(39.17 KB)
📄 README-DPP(5.25 KB)
📄 README-HS20(21.84 KB)
📄 README-P2P(32.99 KB)
📄 README-WPS(15.87 KB)
📄 README-Windows.txt(12.11 KB)
📄 android.config(19.49 KB)
📄 ap.c(43.64 KB)
📄 ap.h(4.4 KB)
📄 autoscan.c(3.48 KB)
📄 autoscan.h(1.36 KB)
📄 autoscan_exponential.c(2.01 KB)
📄 autoscan_periodic.c(1.6 KB)
📄 bgscan.c(2.41 KB)
📄 bgscan.h(2.07 KB)
📄 bgscan_learn.c(14.42 KB)
📄 bgscan_simple.c(8 KB)
📁 binder
📄 blacklist.c(3.38 KB)
📄 blacklist.h(660 B)
📄 bss.c(35.64 KB)
📄 bss.h(5.76 KB)
📄 config.c(119.47 KB)
📄 config.h(50.22 KB)
📄 config_file.c(42.45 KB)
📄 config_none.c(1.25 KB)
📄 config_ssid.h(26.9 KB)
📄 ctrl_iface.c(274.91 KB)
📄 ctrl_iface.h(5.29 KB)
📄 ctrl_iface_named_pipe.c(19.62 KB)
📄 ctrl_iface_udp.c(19.95 KB)
📄 ctrl_iface_unix.c(34.52 KB)
📁 dbus
📄 defconfig(21.75 KB)
📄 dpp_supplicant.c(64.3 KB)
📄 dpp_supplicant.h(1.28 KB)
📄 driver_i.h(28.83 KB)
📄 eap_proxy_dummy.mak(0 B)
📄 eap_proxy_dummy.mk(0 B)
📄 eap_register.c(5.24 KB)
📄 eap_testing.txt(14.43 KB)
📄 eapol_test.c(39.52 KB)
📄 eapol_test.py(4.39 KB)
📄 events.c(135.05 KB)
📁 examples
📄 gas_query.c(24.23 KB)
📄 gas_query.h(1.46 KB)
📄 hs20_supplicant.c(33.17 KB)
📄 hs20_supplicant.h(2.18 KB)
📄 ibss_rsn.c(23.31 KB)
📄 ibss_rsn.h(1.7 KB)
📄 interworking.c(81.56 KB)
📄 interworking.h(1.33 KB)
📄 libwpa_test.c(611 B)
📄 main.c(10.22 KB)
📄 main_none.c(844 B)
📄 mbo.c(14.95 KB)
📄 mesh.c(18.88 KB)
📄 mesh.h(1.39 KB)
📄 mesh_mpm.c(36.44 KB)
📄 mesh_mpm.h(1.45 KB)
📄 mesh_rsn.c(20.72 KB)
📄 mesh_rsn.h(1.43 KB)
📄 nfc_pw_token.c(1.71 KB)
📄 nmake.mak(6.58 KB)
📄 notify.c(20.83 KB)
📄 notify.h(7.2 KB)
📄 offchannel.c(16.1 KB)
📄 offchannel.h(1.37 KB)
📄 op_classes.c(9.3 KB)
📄 p2p_supplicant.c(270.45 KB)
📄 p2p_supplicant.h(12.84 KB)
📄 p2p_supplicant_sd.c(30.81 KB)
📄 preauth_test.c(8.56 KB)
📄 rrm.c(41.04 KB)
📄 scan.c(80.03 KB)
📄 scan.h(2.76 KB)
📄 sme.c(74.45 KB)
📄 sme.h(3.68 KB)
📁 systemd
📄 todo.txt(4.43 KB)
📁 utils
📁 vs2005
📄 wifi_display.c(10.42 KB)
📄 wifi_display.h(904 B)
📄 wmm_ac.c(23.61 KB)
📄 wmm_ac.h(4.84 KB)
📄 wnm_sta.c(50.52 KB)
📄 wnm_sta.h(2.47 KB)
📄 wpa_cli.c(121.3 KB)
📄 wpa_passphrase.c(1.45 KB)
📄 wpa_priv.c(29.97 KB)
📄 wpa_supplicant.c(205.7 KB)
📄 wpa_supplicant.conf(74.93 KB)
📄 wpa_supplicant_conf.mk(1.25 KB)
📄 wpa_supplicant_conf.sh(458 B)
📄 wpa_supplicant_i.h(46.08 KB)
📄 wpa_supplicant_template.conf(136 B)
📄 wpas_glue.c(33.62 KB)
📄 wpas_glue.h(888 B)
📄 wpas_kay.c(9.92 KB)
📄 wpas_kay.h(1.13 KB)
📄 wpas_module_tests.c(2.51 KB)
📄 wps_supplicant.c(79.22 KB)
📄 wps_supplicant.h(5.08 KB)

Editing: bgscan_simple.c

/*
 * WPA Supplicant - background scan and roaming module: simple
 * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "eloop.h"
#include "drivers/driver.h"
#include "config_ssid.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "scan.h"
#include "bgscan.h"

struct bgscan_simple_data {
	struct wpa_supplicant *wpa_s;
	const struct wpa_ssid *ssid;
	int scan_interval;
	int signal_threshold;
	int short_scan_count; /* counter for scans using short scan interval */
	int max_short_scans; /* maximum times we short-scan before back-off */
	int short_interval; /* use if signal < threshold */
	int long_interval; /* use if signal > threshold */
	struct os_reltime last_bgscan;
};

static void bgscan_simple_timeout(void *eloop_ctx, void *timeout_ctx)
{
	struct bgscan_simple_data *data = eloop_ctx;
	struct wpa_supplicant *wpa_s = data->wpa_s;
	struct wpa_driver_scan_params params;

os_memset(&params, 0, sizeof(params));
	params.num_ssids = 1;
	params.ssids[0].ssid = data->ssid->ssid;
	params.ssids[0].ssid_len = data->ssid->ssid_len;
	params.freqs = data->ssid->scan_freq;

/*
	 * A more advanced bgscan module would learn about most like channels
	 * over time and request scans only for some channels (probing others
	 * every now and then) to reduce effect on the data connection.
	 */

wpa_printf(MSG_DEBUG, "bgscan simple: Request a background scan");
	if (wpa_supplicant_trigger_scan(wpa_s, &params)) {
		wpa_printf(MSG_DEBUG, "bgscan simple: Failed to trigger scan");
		eloop_register_timeout(data->scan_interval, 0,
				       bgscan_simple_timeout, data, NULL);
	} else {
		if (data->scan_interval == data->short_interval) {
			data->short_scan_count++;
			if (data->short_scan_count >= data->max_short_scans) {
				data->scan_interval = data->long_interval;
				wpa_printf(MSG_DEBUG, "bgscan simple: Backing "
					   "off to long scan interval");
			}
		} else if (data->short_scan_count > 0) {
			/*
			 * If we lasted a long scan interval without any
			 * CQM triggers, decrease the short-scan count,
			 * which allows 1 more short-scan interval to
			 * occur in the future when CQM triggers.
			 */
			data->short_scan_count--;
		}
		os_get_reltime(&data->last_bgscan);
	}
}

static int bgscan_simple_get_params(struct bgscan_simple_data *data,
				    const char *params)
{
	const char *pos;

data->short_interval = atoi(params);

pos = os_strchr(params, ':');
	if (pos == NULL)
		return 0;
	pos++;
	data->signal_threshold = atoi(pos);
	pos = os_strchr(pos, ':');
	if (pos == NULL) {
		wpa_printf(MSG_ERROR, "bgscan simple: Missing scan interval "
			   "for high signal");
		return -1;
	}
	pos++;
	data->long_interval = atoi(pos);

return 0;
}

static void * bgscan_simple_init(struct wpa_supplicant *wpa_s,
				 const char *params,
				 const struct wpa_ssid *ssid)
{
	struct bgscan_simple_data *data;

data = os_zalloc(sizeof(*data));
	if (data == NULL)
		return NULL;
	data->wpa_s = wpa_s;
	data->ssid = ssid;
	if (bgscan_simple_get_params(data, params) < 0) {
		os_free(data);
		return NULL;
	}
	if (data->short_interval <= 0)
		data->short_interval = 30;
	if (data->long_interval <= 0)
		data->long_interval = 30;

wpa_printf(MSG_DEBUG, "bgscan simple: Signal strength threshold %d  "
		   "Short bgscan interval %d  Long bgscan interval %d",
		   data->signal_threshold, data->short_interval,
		   data->long_interval);

if (data->signal_threshold &&
	    wpa_drv_signal_monitor(wpa_s, data->signal_threshold, 4) < 0) {
		wpa_printf(MSG_ERROR, "bgscan simple: Failed to enable "
			   "signal strength monitoring");
	}

data->scan_interval = data->short_interval;
	data->max_short_scans = data->long_interval / data->short_interval + 1;
	if (data->signal_threshold) {
		/* Poll for signal info to set initial scan interval */
		struct wpa_signal_info siginfo;
		if (wpa_drv_signal_poll(wpa_s, &siginfo) == 0 &&
		    siginfo.current_signal >= data->signal_threshold)
			data->scan_interval = data->long_interval;
	}
	wpa_printf(MSG_DEBUG, "bgscan simple: Init scan interval: %d",
		   data->scan_interval);
	eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
			       data, NULL);

/*
	 * This function is called immediately after an association, so it is
	 * reasonable to assume that a scan was completed recently. This makes
	 * us skip an immediate new scan in cases where the current signal
	 * level is below the bgscan threshold.
	 */
	os_get_reltime(&data->last_bgscan);

return data;
}

static void bgscan_simple_deinit(void *priv)
{
	struct bgscan_simple_data *data = priv;
	eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
	if (data->signal_threshold)
		wpa_drv_signal_monitor(data->wpa_s, 0, 0);
	os_free(data);
}

static int bgscan_simple_notify_scan(void *priv,
				     struct wpa_scan_results *scan_res)
{
	struct bgscan_simple_data *data = priv;

wpa_printf(MSG_DEBUG, "bgscan simple: scan result notification");

eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
	eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
			       data, NULL);

/*
	 * A more advanced bgscan could process scan results internally, select
	 * the BSS and request roam if needed. This sample uses the existing
	 * BSS/ESS selection routine. Change this to return 1 if selection is
	 * done inside the bgscan module.
	 */

return 0;
}

static void bgscan_simple_notify_beacon_loss(void *priv)
{
	wpa_printf(MSG_DEBUG, "bgscan simple: beacon loss");
	/* TODO: speed up background scanning */
}

static void bgscan_simple_notify_signal_change(void *priv, int above,
					       int current_signal,
					       int current_noise,
					       int current_txrate)
{
	struct bgscan_simple_data *data = priv;
	int scan = 0;
	struct os_reltime now;

if (data->short_interval == data->long_interval ||
	    data->signal_threshold == 0)
		return;

wpa_printf(MSG_DEBUG, "bgscan simple: signal level changed "
		   "(above=%d current_signal=%d current_noise=%d "
		   "current_txrate=%d))", above, current_signal,
		   current_noise, current_txrate);
	if (data->scan_interval == data->long_interval && !above) {
		wpa_printf(MSG_DEBUG, "bgscan simple: Start using short "
			   "bgscan interval");
		data->scan_interval = data->short_interval;
		os_get_reltime(&now);
		if (now.sec > data->last_bgscan.sec + 1 &&
		    data->short_scan_count <= data->max_short_scans)
			/*
			 * If we haven't just previously (<1 second ago)
			 * performed a scan, and we haven't depleted our
			 * budget for short-scans, perform a scan
			 * immediately.
			 */
			scan = 1;
		else if (data->last_bgscan.sec + data->long_interval >
			 now.sec + data->scan_interval) {
			/*
			 * Restart scan interval timer if currently scheduled
			 * scan is too far in the future.
			 */
			eloop_cancel_timeout(bgscan_simple_timeout, data,
					     NULL);
			eloop_register_timeout(data->scan_interval, 0,
					       bgscan_simple_timeout, data,
					       NULL);
		}
	} else if (data->scan_interval == data->short_interval && above) {
		wpa_printf(MSG_DEBUG, "bgscan simple: Start using long bgscan "
			   "interval");
		data->scan_interval = data->long_interval;
		eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
		eloop_register_timeout(data->scan_interval, 0,
				       bgscan_simple_timeout, data, NULL);
	} else if (!above) {
		/*
		 * Signal dropped further 4 dB. Request a new scan if we have
		 * not yet scanned in a while.
		 */
		os_get_reltime(&now);
		if (now.sec > data->last_bgscan.sec + 10)
			scan = 1;
	}

if (scan) {
		wpa_printf(MSG_DEBUG, "bgscan simple: Trigger immediate scan");
		eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
		eloop_register_timeout(0, 0, bgscan_simple_timeout, data,
				       NULL);
	}
}

const struct bgscan_ops bgscan_simple_ops = {
	.name = "simple",
	.init = bgscan_simple_init,
	.deinit = bgscan_simple_deinit,
	.notify_scan = bgscan_simple_notify_scan,
	.notify_beacon_loss = bgscan_simple_notify_beacon_loss,
	.notify_signal_change = bgscan_simple_notify_signal_change,
};

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Editing: bgscan_simple.c

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