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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 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
20 extern const struct autoscan_ops autoscan_exponential_ops;
21 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
22 
23 #ifdef CONFIG_AUTOSCAN_PERIODIC
24 extern const struct autoscan_ops autoscan_periodic_ops;
25 #endif /* CONFIG_AUTOSCAN_PERIODIC */
26 
27 static const struct autoscan_ops * autoscan_modules[] = {
28 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
29 	&autoscan_exponential_ops,
30 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
31 #ifdef CONFIG_AUTOSCAN_PERIODIC
32 	&autoscan_periodic_ops,
33 #endif /* CONFIG_AUTOSCAN_PERIODIC */
34 	NULL
35 };
36 
37 
request_scan(struct wpa_supplicant * wpa_s)38 static void request_scan(struct wpa_supplicant *wpa_s)
39 {
40 	wpa_s->scan_req = MANUAL_SCAN_REQ;
41 
42 	if (wpa_supplicant_req_sched_scan(wpa_s))
43 		wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0);
44 }
45 
46 
autoscan_init(struct wpa_supplicant * wpa_s,int req_scan)47 int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan)
48 {
49 	const char *name = wpa_s->conf->autoscan;
50 	const char *params;
51 	size_t nlen;
52 	int i;
53 	const struct autoscan_ops *ops = NULL;
54 	struct sched_scan_plan *scan_plans;
55 
56 	/* Give preference to scheduled scan plans if supported/configured */
57 	if (wpa_s->sched_scan_plans)
58 		return 0;
59 
60 	if (wpa_s->autoscan && wpa_s->autoscan_priv)
61 		return 0;
62 
63 	if (name == NULL)
64 		return 0;
65 
66 	params = os_strchr(name, ':');
67 	if (params == NULL) {
68 		params = "";
69 		nlen = os_strlen(name);
70 	} else {
71 		nlen = params - name;
72 		params++;
73 	}
74 
75 	for (i = 0; autoscan_modules[i]; i++) {
76 		if (os_strncmp(name, autoscan_modules[i]->name, nlen) == 0) {
77 			ops = autoscan_modules[i];
78 			break;
79 		}
80 	}
81 
82 	if (ops == NULL) {
83 		wpa_printf(MSG_ERROR, "autoscan: Could not find module "
84 			   "matching the parameter '%s'", name);
85 		return -1;
86 	}
87 
88 	scan_plans = os_malloc(sizeof(*wpa_s->sched_scan_plans));
89 	if (!scan_plans)
90 		return -1;
91 
92 	wpa_s->autoscan_params = NULL;
93 
94 	wpa_s->autoscan_priv = ops->init(wpa_s, params);
95 	if (!wpa_s->autoscan_priv) {
96 		os_free(scan_plans);
97 		return -1;
98 	}
99 
100 	scan_plans[0].interval = 5;
101 	scan_plans[0].iterations = 0;
102 	os_free(wpa_s->sched_scan_plans);
103 	wpa_s->sched_scan_plans = scan_plans;
104 	wpa_s->sched_scan_plans_num = 1;
105 	wpa_s->autoscan = ops;
106 
107 	wpa_printf(MSG_DEBUG, "autoscan: Initialized module '%s' with "
108 		   "parameters '%s'", ops->name, params);
109 	if (!req_scan)
110 		return 0;
111 
112 	/*
113 	 * Cancelling existing scan requests, if any.
114 	 */
115 	wpa_supplicant_cancel_sched_scan(wpa_s);
116 	wpa_supplicant_cancel_scan(wpa_s);
117 
118 	/*
119 	 * Firing first scan, which will lead to call autoscan_notify_scan.
120 	 */
121 	request_scan(wpa_s);
122 
123 	return 0;
124 }
125 
126 
autoscan_deinit(struct wpa_supplicant * wpa_s)127 void autoscan_deinit(struct wpa_supplicant *wpa_s)
128 {
129 	if (wpa_s->autoscan && wpa_s->autoscan_priv) {
130 		wpa_printf(MSG_DEBUG, "autoscan: Deinitializing module '%s'",
131 			   wpa_s->autoscan->name);
132 		wpa_s->autoscan->deinit(wpa_s->autoscan_priv);
133 		wpa_s->autoscan = NULL;
134 		wpa_s->autoscan_priv = NULL;
135 
136 		wpa_s->scan_interval = 5;
137 
138 		os_free(wpa_s->sched_scan_plans);
139 		wpa_s->sched_scan_plans = NULL;
140 		wpa_s->sched_scan_plans_num = 0;
141 	}
142 }
143 
144 
autoscan_notify_scan(struct wpa_supplicant * wpa_s,struct wpa_scan_results * scan_res)145 int autoscan_notify_scan(struct wpa_supplicant *wpa_s,
146 			 struct wpa_scan_results *scan_res)
147 {
148 	int interval;
149 
150 	if (wpa_s->autoscan && wpa_s->autoscan_priv) {
151 		interval = wpa_s->autoscan->notify_scan(wpa_s->autoscan_priv,
152 							scan_res);
153 
154 		if (interval <= 0)
155 			return -1;
156 
157 		wpa_s->scan_interval = interval;
158 		wpa_s->sched_scan_plans[0].interval = interval;
159 
160 		request_scan(wpa_s);
161 	}
162 
163 	return 0;
164 }
165