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