131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* WPA Supplicant - background scan and roaming module: simple
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* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "eloop.h"
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#include "drivers/driver.h"
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#include "config_ssid.h"
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#include "wpa_supplicant_i.h"
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#include "bgscan.h"
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struct bgscan_simple_data {
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struct wpa_supplicant *wpa_s;
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const struct wpa_ssid *ssid;
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int scan_interval;
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};
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static void bgscan_simple_timeout(void *eloop_ctx, void *timeout_ctx)
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{
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struct bgscan_simple_data *data = eloop_ctx;
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struct wpa_supplicant *wpa_s = data->wpa_s;
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struct wpa_driver_scan_params params;
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os_memset(¶ms, 0, sizeof(params));
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params.num_ssids = 1;
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params.ssids[0].ssid = data->ssid->ssid;
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params.ssids[0].ssid_len = data->ssid->ssid_len;
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params.freqs = data->ssid->scan_freq;
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/*
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* A more advanced bgscan module would learn about most like channels
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* over time and request scans only for some channels (probing others
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* every now and then) to reduce effect on the data connection.
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*/
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wpa_printf(MSG_DEBUG, "bgscan simple: Request a background scan");
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if (wpa_supplicant_trigger_scan(wpa_s, ¶ms)) {
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wpa_printf(MSG_DEBUG, "bgscan simple: Failed to trigger scan");
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eloop_register_timeout(data->scan_interval, 0,
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bgscan_simple_timeout, data, NULL);
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}
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}
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static void * bgscan_simple_init(struct wpa_supplicant *wpa_s,
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const char *params,
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const struct wpa_ssid *ssid)
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{
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struct bgscan_simple_data *data;
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data = os_zalloc(sizeof(*data));
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if (data == NULL)
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return NULL;
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data->wpa_s = wpa_s;
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data->ssid = ssid;
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if (params)
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data->scan_interval = atoi(params);
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if (data->scan_interval <= 0)
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data->scan_interval = 30;
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eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
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data, NULL);
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return data;
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}
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static void bgscan_simple_deinit(void *priv)
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{
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struct bgscan_simple_data *data = priv;
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eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
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os_free(data);
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}
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static int bgscan_simple_notify_scan(void *priv)
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{
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struct bgscan_simple_data *data = priv;
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wpa_printf(MSG_DEBUG, "bgscan simple: scan result notification");
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eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
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eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
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data, NULL);
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/*
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* A more advanced bgscan could process scan results internally, select
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* the BSS and request roam if needed. This sample uses the existing
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* BSS/ESS selection routine. Change this to return 1 if selection is
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* done inside the bgscan module.
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*/
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return 0;
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}
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static void bgscan_simple_notify_beacon_loss(void *priv)
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{
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wpa_printf(MSG_DEBUG, "bgscan simple: beacon loss");
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/* TODO: speed up background scanning */
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}
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static void bgscan_simple_notify_signal_change(void *priv)
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{
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wpa_printf(MSG_DEBUG, "bgscan simple: signal level changed");
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/* TODO: if signal strength dropped enough, speed up background
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* scanning */
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}
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const struct bgscan_ops bgscan_simple_ops = {
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.name = "simple",
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.init = bgscan_simple_init,
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.deinit = bgscan_simple_deinit,
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.notify_scan = bgscan_simple_notify_scan,
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.notify_beacon_loss = bgscan_simple_notify_beacon_loss,
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.notify_signal_change = bgscan_simple_notify_signal_change,
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};
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