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
20extern const struct autoscan_ops autoscan_exponential_ops;
21#endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
22
23#ifdef CONFIG_AUTOSCAN_PERIODIC
24extern const struct autoscan_ops autoscan_periodic_ops;
25#endif /* CONFIG_AUTOSCAN_PERIODIC */
26
27static 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
38static 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
47int 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
127void 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
145int 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