mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-28 18:28:23 -05:00
460b36d0c0
The first time the limit is exceeded could result in using larger value - avoid that by limiting the interval also in that case. Signed-hostap: Jouni Malinen <j@w1.fi>
105 lines
2.0 KiB
C
105 lines
2.0 KiB
C
/*
|
|
* WPA Supplicant - auto scan exponential module
|
|
* Copyright (c) 2012, Intel Corporation. All rights reserved.
|
|
*
|
|
* This software may be distributed under the terms of the BSD license.
|
|
* See README for more details.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include "common.h"
|
|
#include "wpa_supplicant_i.h"
|
|
#include "autoscan.h"
|
|
|
|
struct autoscan_exponential_data {
|
|
struct wpa_supplicant *wpa_s;
|
|
int base;
|
|
int limit;
|
|
int interval;
|
|
};
|
|
|
|
|
|
static int
|
|
autoscan_exponential_get_params(struct autoscan_exponential_data *data,
|
|
const char *params)
|
|
{
|
|
const char *pos;
|
|
|
|
if (params == NULL)
|
|
return -1;
|
|
|
|
data->base = atoi(params);
|
|
|
|
pos = os_strchr(params, ':');
|
|
if (pos == NULL)
|
|
return -1;
|
|
|
|
pos++;
|
|
data->limit = atoi(pos);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void * autoscan_exponential_init(struct wpa_supplicant *wpa_s,
|
|
const char *params)
|
|
{
|
|
struct autoscan_exponential_data *data;
|
|
|
|
data = os_zalloc(sizeof(struct autoscan_exponential_data));
|
|
if (data == NULL)
|
|
return NULL;
|
|
|
|
if (autoscan_exponential_get_params(data, params) < 0) {
|
|
os_free(data);
|
|
return NULL;
|
|
}
|
|
|
|
wpa_printf(MSG_DEBUG, "autoscan exponential: base exponential is %d "
|
|
"and limit is %d", data->base, data->limit);
|
|
|
|
data->wpa_s = wpa_s;
|
|
|
|
return data;
|
|
}
|
|
|
|
|
|
static void autoscan_exponential_deinit(void *priv)
|
|
{
|
|
struct autoscan_exponential_data *data = priv;
|
|
|
|
os_free(data);
|
|
}
|
|
|
|
|
|
static int autoscan_exponential_notify_scan(void *priv,
|
|
struct wpa_scan_results *scan_res)
|
|
{
|
|
struct autoscan_exponential_data *data = priv;
|
|
|
|
wpa_printf(MSG_DEBUG, "autoscan exponential: scan result "
|
|
"notification");
|
|
|
|
if (data->interval >= data->limit)
|
|
return data->limit;
|
|
|
|
if (data->interval <= 0)
|
|
data->interval = data->base;
|
|
else {
|
|
data->interval = data->interval * data->base;
|
|
if (data->interval > data->limit)
|
|
return data->limit;
|
|
}
|
|
|
|
return data->interval;
|
|
}
|
|
|
|
|
|
const struct autoscan_ops autoscan_exponential_ops = {
|
|
.name = "exponential",
|
|
.init = autoscan_exponential_init,
|
|
.deinit = autoscan_exponential_deinit,
|
|
.notify_scan = autoscan_exponential_notify_scan,
|
|
};
|