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[AROS.git] / workbench / network / WirelessManager / wpa_supplicant / bgscan_simple.c
blob8e80b129ebf455ad4343ebd4bb750fc09aecad8a
1 /*
2 * WPA Supplicant - background scan and roaming module: simple
3 * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
12 * See README and COPYING for more details.
15 #include "includes.h"
17 #include "common.h"
18 #include "eloop.h"
19 #include "drivers/driver.h"
20 #include "config_ssid.h"
21 #include "wpa_supplicant_i.h"
22 #include "driver_i.h"
23 #include "scan.h"
24 #include "bgscan.h"
26 struct bgscan_simple_data {
27 struct wpa_supplicant *wpa_s;
28 const struct wpa_ssid *ssid;
29 int scan_interval;
30 int signal_threshold;
31 int short_interval; /* use if signal < threshold */
32 int long_interval; /* use if signal > threshold */
33 struct os_time last_bgscan;
37 static void bgscan_simple_timeout(void *eloop_ctx, void *timeout_ctx)
39 struct bgscan_simple_data *data = eloop_ctx;
40 struct wpa_supplicant *wpa_s = data->wpa_s;
41 struct wpa_driver_scan_params params;
43 os_memset(&params, 0, sizeof(params));
44 params.num_ssids = 1;
45 params.ssids[0].ssid = data->ssid->ssid;
46 params.ssids[0].ssid_len = data->ssid->ssid_len;
47 params.freqs = data->ssid->scan_freq;
50 * A more advanced bgscan module would learn about most like channels
51 * over time and request scans only for some channels (probing others
52 * every now and then) to reduce effect on the data connection.
55 wpa_printf(MSG_DEBUG, "bgscan simple: Request a background scan");
56 if (wpa_supplicant_trigger_scan(wpa_s, &params)) {
57 wpa_printf(MSG_DEBUG, "bgscan simple: Failed to trigger scan");
58 eloop_register_timeout(data->scan_interval, 0,
59 bgscan_simple_timeout, data, NULL);
60 } else
61 os_get_time(&data->last_bgscan);
65 static int bgscan_simple_get_params(struct bgscan_simple_data *data,
66 const char *params)
68 const char *pos;
70 if (params == NULL)
71 return 0;
73 data->short_interval = atoi(params);
75 pos = os_strchr(params, ':');
76 if (pos == NULL)
77 return 0;
78 pos++;
79 data->signal_threshold = atoi(pos);
80 pos = os_strchr(pos, ':');
81 if (pos == NULL) {
82 wpa_printf(MSG_ERROR, "bgscan simple: Missing scan interval "
83 "for high signal");
84 return -1;
86 pos++;
87 data->long_interval = atoi(pos);
89 return 0;
93 static void * bgscan_simple_init(struct wpa_supplicant *wpa_s,
94 const char *params,
95 const struct wpa_ssid *ssid)
97 struct bgscan_simple_data *data;
99 data = os_zalloc(sizeof(*data));
100 if (data == NULL)
101 return NULL;
102 data->wpa_s = wpa_s;
103 data->ssid = ssid;
104 if (bgscan_simple_get_params(data, params) < 0) {
105 os_free(data);
106 return NULL;
108 if (data->short_interval <= 0)
109 data->short_interval = 30;
110 if (data->long_interval <= 0)
111 data->long_interval = 30;
113 wpa_printf(MSG_DEBUG, "bgscan simple: Signal strength threshold %d "
114 "Short bgscan interval %d Long bgscan interval %d",
115 data->signal_threshold, data->short_interval,
116 data->long_interval);
118 if (data->signal_threshold &&
119 wpa_drv_signal_monitor(wpa_s, data->signal_threshold, 4) < 0) {
120 wpa_printf(MSG_ERROR, "bgscan simple: Failed to enable "
121 "signal strength monitoring");
124 data->scan_interval = data->short_interval;
125 eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
126 data, NULL);
129 * This function is called immediately after an association, so it is
130 * reasonable to assume that a scan was completed recently. This makes
131 * us skip an immediate new scan in cases where the current signal
132 * level is below the bgscan threshold.
134 os_get_time(&data->last_bgscan);
136 return data;
140 static void bgscan_simple_deinit(void *priv)
142 struct bgscan_simple_data *data = priv;
143 eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
144 if (data->signal_threshold)
145 wpa_drv_signal_monitor(data->wpa_s, 0, 0);
146 os_free(data);
150 static int bgscan_simple_notify_scan(void *priv)
152 struct bgscan_simple_data *data = priv;
154 wpa_printf(MSG_DEBUG, "bgscan simple: scan result notification");
156 eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
157 eloop_register_timeout(data->scan_interval, 0, bgscan_simple_timeout,
158 data, NULL);
161 * A more advanced bgscan could process scan results internally, select
162 * the BSS and request roam if needed. This sample uses the existing
163 * BSS/ESS selection routine. Change this to return 1 if selection is
164 * done inside the bgscan module.
167 return 0;
171 static void bgscan_simple_notify_beacon_loss(void *priv)
173 wpa_printf(MSG_DEBUG, "bgscan simple: beacon loss");
174 /* TODO: speed up background scanning */
178 static void bgscan_simple_notify_signal_change(void *priv, int above)
180 struct bgscan_simple_data *data = priv;
181 int scan = 0;
182 struct os_time now;
184 if (data->short_interval == data->long_interval ||
185 data->signal_threshold == 0)
186 return;
188 wpa_printf(MSG_DEBUG, "bgscan simple: signal level changed "
189 "(above=%d)", above);
190 if (data->scan_interval == data->long_interval && !above) {
191 wpa_printf(MSG_DEBUG, "bgscan simple: Start using short "
192 "bgscan interval");
193 data->scan_interval = data->short_interval;
194 os_get_time(&now);
195 if (now.sec > data->last_bgscan.sec + 1)
196 scan = 1;
197 } else if (data->scan_interval == data->short_interval && above) {
198 wpa_printf(MSG_DEBUG, "bgscan simple: Start using long bgscan "
199 "interval");
200 data->scan_interval = data->long_interval;
201 eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
202 eloop_register_timeout(data->scan_interval, 0,
203 bgscan_simple_timeout, data, NULL);
204 } else if (!above) {
206 * Signal dropped further 4 dB. Request a new scan if we have
207 * not yet scanned in a while.
209 os_get_time(&now);
210 if (now.sec > data->last_bgscan.sec + 10)
211 scan = 1;
214 if (scan) {
215 wpa_printf(MSG_DEBUG, "bgscan simple: Trigger immediate scan");
216 eloop_cancel_timeout(bgscan_simple_timeout, data, NULL);
217 eloop_register_timeout(0, 0, bgscan_simple_timeout, data,
218 NULL);
223 const struct bgscan_ops bgscan_simple_ops = {
224 .name = "simple",
225 .init = bgscan_simple_init,
226 .deinit = bgscan_simple_deinit,
227 .notify_scan = bgscan_simple_notify_scan,
228 .notify_beacon_loss = bgscan_simple_notify_beacon_loss,
229 .notify_signal_change = bgscan_simple_notify_signal_change,