1*62a52023Schristos /*
2*62a52023Schristos * WPA Supplicant - auto scan exponential module
3*62a52023Schristos * Copyright (c) 2012, Intel Corporation. All rights reserved.
4*62a52023Schristos *
5*62a52023Schristos * This software may be distributed under the terms of the BSD license.
6*62a52023Schristos * See README for more details.
7*62a52023Schristos */
8*62a52023Schristos
9*62a52023Schristos #include "includes.h"
10*62a52023Schristos
11*62a52023Schristos #include "common.h"
12*62a52023Schristos #include "wpa_supplicant_i.h"
13*62a52023Schristos #include "autoscan.h"
14*62a52023Schristos
15*62a52023Schristos struct autoscan_exponential_data {
16*62a52023Schristos struct wpa_supplicant *wpa_s;
17*62a52023Schristos int base;
18*62a52023Schristos int limit;
19*62a52023Schristos int interval;
20*62a52023Schristos };
21*62a52023Schristos
22*62a52023Schristos
23*62a52023Schristos static int
autoscan_exponential_get_params(struct autoscan_exponential_data * data,const char * params)24*62a52023Schristos autoscan_exponential_get_params(struct autoscan_exponential_data *data,
25*62a52023Schristos const char *params)
26*62a52023Schristos {
27*62a52023Schristos const char *pos;
28*62a52023Schristos
29*62a52023Schristos if (params == NULL)
30*62a52023Schristos return -1;
31*62a52023Schristos
32*62a52023Schristos data->base = atoi(params);
33*62a52023Schristos
34*62a52023Schristos pos = os_strchr(params, ':');
35*62a52023Schristos if (pos == NULL)
36*62a52023Schristos return -1;
37*62a52023Schristos
38*62a52023Schristos pos++;
39*62a52023Schristos data->limit = atoi(pos);
40*62a52023Schristos
41*62a52023Schristos return 0;
42*62a52023Schristos }
43*62a52023Schristos
44*62a52023Schristos
autoscan_exponential_init(struct wpa_supplicant * wpa_s,const char * params)45*62a52023Schristos static void * autoscan_exponential_init(struct wpa_supplicant *wpa_s,
46*62a52023Schristos const char *params)
47*62a52023Schristos {
48*62a52023Schristos struct autoscan_exponential_data *data;
49*62a52023Schristos
50*62a52023Schristos data = os_zalloc(sizeof(struct autoscan_exponential_data));
51*62a52023Schristos if (data == NULL)
52*62a52023Schristos return NULL;
53*62a52023Schristos
54*62a52023Schristos if (autoscan_exponential_get_params(data, params) < 0) {
55*62a52023Schristos os_free(data);
56*62a52023Schristos return NULL;
57*62a52023Schristos }
58*62a52023Schristos
59*62a52023Schristos wpa_printf(MSG_DEBUG, "autoscan exponential: base exponential is %d "
60*62a52023Schristos "and limit is %d", data->base, data->limit);
61*62a52023Schristos
62*62a52023Schristos data->wpa_s = wpa_s;
63*62a52023Schristos
64*62a52023Schristos return data;
65*62a52023Schristos }
66*62a52023Schristos
67*62a52023Schristos
autoscan_exponential_deinit(void * priv)68*62a52023Schristos static void autoscan_exponential_deinit(void *priv)
69*62a52023Schristos {
70*62a52023Schristos struct autoscan_exponential_data *data = priv;
71*62a52023Schristos
72*62a52023Schristos os_free(data);
73*62a52023Schristos }
74*62a52023Schristos
75*62a52023Schristos
autoscan_exponential_notify_scan(void * priv,struct wpa_scan_results * scan_res)76*62a52023Schristos static int autoscan_exponential_notify_scan(void *priv,
77*62a52023Schristos struct wpa_scan_results *scan_res)
78*62a52023Schristos {
79*62a52023Schristos struct autoscan_exponential_data *data = priv;
80*62a52023Schristos
81*62a52023Schristos wpa_printf(MSG_DEBUG, "autoscan exponential: scan result "
82*62a52023Schristos "notification");
83*62a52023Schristos
84*62a52023Schristos if (data->interval >= data->limit)
85*62a52023Schristos return data->limit;
86*62a52023Schristos
87*62a52023Schristos if (data->interval <= 0)
88*62a52023Schristos data->interval = data->base;
89*62a52023Schristos else {
90*62a52023Schristos data->interval = data->interval * data->base;
91*62a52023Schristos if (data->interval > data->limit)
92*62a52023Schristos return data->limit;
93*62a52023Schristos }
94*62a52023Schristos
95*62a52023Schristos return data->interval;
96*62a52023Schristos }
97*62a52023Schristos
98*62a52023Schristos
99*62a52023Schristos const struct autoscan_ops autoscan_exponential_ops = {
100*62a52023Schristos .name = "exponential",
101*62a52023Schristos .init = autoscan_exponential_init,
102*62a52023Schristos .deinit = autoscan_exponential_deinit,
103*62a52023Schristos .notify_scan = autoscan_exponential_notify_scan,
104*62a52023Schristos };
105