1 /*
2 * WPA Supplicant - auto scan
3 * Copyright (c) 2012, Intel Corporation. All rights reserved.
4 * Copyright 2015 Intel Deutschland GmbH
5 *
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10 #include "includes.h"
11
12 #include "common.h"
13 #include "config.h"
14 #include "wpa_supplicant_i.h"
15 #include "bss.h"
16 #include "scan.h"
17 #include "autoscan.h"
18
19
20 static const struct autoscan_ops * autoscan_modules[] = {
21 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
22 &autoscan_exponential_ops,
23 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
24 #ifdef CONFIG_AUTOSCAN_PERIODIC
25 &autoscan_periodic_ops,
26 #endif /* CONFIG_AUTOSCAN_PERIODIC */
27 NULL
28 };
29
30
request_scan(struct wpa_supplicant * wpa_s)31 static void request_scan(struct wpa_supplicant *wpa_s)
32 {
33 wpa_s->scan_req = MANUAL_SCAN_REQ;
34
35 if (wpa_supplicant_req_sched_scan(wpa_s))
36 wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0);
37 }
38
39
autoscan_init(struct wpa_supplicant * wpa_s,int req_scan)40 int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan)
41 {
42 const char *name = wpa_s->conf->autoscan;
43 const char *params;
44 size_t nlen;
45 int i;
46 const struct autoscan_ops *ops = NULL;
47 struct sched_scan_plan *scan_plans;
48
49 /* Give preference to scheduled scan plans if supported/configured */
50 if (wpa_s->sched_scan_plans) {
51 wpa_printf(MSG_DEBUG,
52 "autoscan: sched_scan_plans set - use it instead");
53 return 0;
54 }
55
56 if (wpa_s->autoscan && wpa_s->autoscan_priv) {
57 wpa_printf(MSG_DEBUG, "autoscan: Already initialized");
58 return 0;
59 }
60
61 if (name == NULL)
62 return 0;
63
64 params = os_strchr(name, ':');
65 if (params == NULL) {
66 params = "";
67 nlen = os_strlen(name);
68 } else {
69 nlen = params - name;
70 params++;
71 }
72
73 for (i = 0; autoscan_modules[i]; i++) {
74 if (os_strncmp(name, autoscan_modules[i]->name, nlen) == 0) {
75 ops = autoscan_modules[i];
76 break;
77 }
78 }
79
80 if (ops == NULL) {
81 wpa_printf(MSG_ERROR, "autoscan: Could not find module "
82 "matching the parameter '%s'", name);
83 return -1;
84 }
85
86 scan_plans = os_malloc(sizeof(*wpa_s->sched_scan_plans));
87 if (!scan_plans)
88 return -1;
89
90 wpa_s->autoscan_params = NULL;
91
92 wpa_s->autoscan_priv = ops->init(wpa_s, params);
93 if (!wpa_s->autoscan_priv) {
94 os_free(scan_plans);
95 return -1;
96 }
97
98 scan_plans[0].interval = 5;
99 scan_plans[0].iterations = 0;
100 os_free(wpa_s->sched_scan_plans);
101 wpa_s->sched_scan_plans = scan_plans;
102 wpa_s->sched_scan_plans_num = 1;
103 wpa_s->autoscan = ops;
104
105 wpa_printf(MSG_DEBUG, "autoscan: Initialized module '%s' with "
106 "parameters '%s'", ops->name, params);
107 if (!req_scan)
108 return 0;
109
110 /*
111 * Cancelling existing scan requests, if any.
112 */
113 wpa_supplicant_cancel_sched_scan(wpa_s);
114 wpa_supplicant_cancel_scan(wpa_s);
115
116 /*
117 * Firing first scan, which will lead to call autoscan_notify_scan.
118 */
119 request_scan(wpa_s);
120
121 return 0;
122 }
123
124
autoscan_deinit(struct wpa_supplicant * wpa_s)125 void autoscan_deinit(struct wpa_supplicant *wpa_s)
126 {
127 if (wpa_s->autoscan && wpa_s->autoscan_priv) {
128 wpa_printf(MSG_DEBUG, "autoscan: Deinitializing module '%s'",
129 wpa_s->autoscan->name);
130 wpa_s->autoscan->deinit(wpa_s->autoscan_priv);
131 wpa_s->autoscan = NULL;
132 wpa_s->autoscan_priv = NULL;
133
134 wpa_s->scan_interval = 5;
135
136 os_free(wpa_s->sched_scan_plans);
137 wpa_s->sched_scan_plans = NULL;
138 wpa_s->sched_scan_plans_num = 0;
139 }
140 }
141
142
autoscan_notify_scan(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)143 int autoscan_notify_scan(struct wpa_supplicant *wpa_s,
144 struct wpa_scan_results *scan_res)
145 {
146 int interval;
147
148 if (wpa_s->autoscan && wpa_s->autoscan_priv) {
149 interval = wpa_s->autoscan->notify_scan(wpa_s->autoscan_priv,
150 scan_res);
151
152 if (interval <= 0)
153 return -1;
154
155 wpa_s->scan_interval = interval;
156 wpa_s->sched_scan_plans[0].interval = interval;
157
158 request_scan(wpa_s);
159 }
160
161 return 0;
162 }
163