hostap/wpa_supplicant/autoscan.c

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/*
* WPA Supplicant - auto scan
* Copyright (c) 2012, Intel Corporation. All rights reserved.
* Copyright 2015 Intel Deutschland GmbH
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "bss.h"
#include "scan.h"
#include "autoscan.h"
static const struct autoscan_ops * autoscan_modules[] = {
#ifdef CONFIG_AUTOSCAN_EXPONENTIAL
&autoscan_exponential_ops,
#endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
#ifdef CONFIG_AUTOSCAN_PERIODIC
&autoscan_periodic_ops,
#endif /* CONFIG_AUTOSCAN_PERIODIC */
NULL
};
static void request_scan(struct wpa_supplicant *wpa_s)
{
wpa_s->scan_req = MANUAL_SCAN_REQ;
if (wpa_supplicant_req_sched_scan(wpa_s))
wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0);
}
int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan)
{
const char *name = wpa_s->conf->autoscan;
const char *params;
size_t nlen;
int i;
const struct autoscan_ops *ops = NULL;
struct sched_scan_plan *scan_plans;
/* Give preference to scheduled scan plans if supported/configured */
if (wpa_s->sched_scan_plans) {
wpa_printf(MSG_DEBUG,
"autoscan: sched_scan_plans set - use it instead");
return 0;
}
if (wpa_s->autoscan && wpa_s->autoscan_priv) {
wpa_printf(MSG_DEBUG, "autoscan: Already initialized");
return 0;
}
if (name == NULL)
return 0;
params = os_strchr(name, ':');
if (params == NULL) {
params = "";
nlen = os_strlen(name);
} else {
nlen = params - name;
params++;
}
for (i = 0; autoscan_modules[i]; i++) {
if (os_strncmp(name, autoscan_modules[i]->name, nlen) == 0) {
ops = autoscan_modules[i];
break;
}
}
if (ops == NULL) {
wpa_printf(MSG_ERROR, "autoscan: Could not find module "
"matching the parameter '%s'", name);
return -1;
}
scan_plans = os_malloc(sizeof(*wpa_s->sched_scan_plans));
if (!scan_plans)
return -1;
wpa_s->autoscan_params = NULL;
wpa_s->autoscan_priv = ops->init(wpa_s, params);
if (!wpa_s->autoscan_priv) {
os_free(scan_plans);
return -1;
}
scan_plans[0].interval = 5;
scan_plans[0].iterations = 0;
os_free(wpa_s->sched_scan_plans);
wpa_s->sched_scan_plans = scan_plans;
wpa_s->sched_scan_plans_num = 1;
wpa_s->autoscan = ops;
wpa_printf(MSG_DEBUG, "autoscan: Initialized module '%s' with "
"parameters '%s'", ops->name, params);
if (!req_scan)
return 0;
/*
* Cancelling existing scan requests, if any.
*/
wpa_supplicant_cancel_sched_scan(wpa_s);
wpa_supplicant_cancel_scan(wpa_s);
/*
* Firing first scan, which will lead to call autoscan_notify_scan.
*/
request_scan(wpa_s);
return 0;
}
void autoscan_deinit(struct wpa_supplicant *wpa_s)
{
if (wpa_s->autoscan && wpa_s->autoscan_priv) {
wpa_printf(MSG_DEBUG, "autoscan: Deinitializing module '%s'",
wpa_s->autoscan->name);
wpa_s->autoscan->deinit(wpa_s->autoscan_priv);
wpa_s->autoscan = NULL;
wpa_s->autoscan_priv = NULL;
wpa_s->scan_interval = 5;
os_free(wpa_s->sched_scan_plans);
wpa_s->sched_scan_plans = NULL;
wpa_s->sched_scan_plans_num = 0;
}
}
int autoscan_notify_scan(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res)
{
int interval;
if (wpa_s->autoscan && wpa_s->autoscan_priv) {
interval = wpa_s->autoscan->notify_scan(wpa_s->autoscan_priv,
scan_res);
if (interval <= 0)
return -1;
wpa_s->scan_interval = interval;
wpa_s->sched_scan_plans[0].interval = interval;
request_scan(wpa_s);
}
return 0;
}