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7c865c68 TB |
1 | /* |
2 | * WPA Supplicant - auto scan | |
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 "config.h" | |
13 | #include "wpa_supplicant_i.h" | |
14 | #include "bss.h" | |
15 | #include "scan.h" | |
16 | #include "autoscan.h" | |
17 | ||
c0fba2b3 TB |
18 | #ifdef CONFIG_AUTOSCAN_EXPONENTIAL |
19 | extern const struct autoscan_ops autoscan_exponential_ops; | |
20 | #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */ | |
21 | ||
e3659c89 TB |
22 | #ifdef CONFIG_AUTOSCAN_PERIODIC |
23 | extern const struct autoscan_ops autoscan_periodic_ops; | |
24 | #endif /* CONFIG_AUTOSCAN_PERIODIC */ | |
25 | ||
7c865c68 | 26 | static const struct autoscan_ops * autoscan_modules[] = { |
c0fba2b3 TB |
27 | #ifdef CONFIG_AUTOSCAN_EXPONENTIAL |
28 | &autoscan_exponential_ops, | |
29 | #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */ | |
e3659c89 TB |
30 | #ifdef CONFIG_AUTOSCAN_PERIODIC |
31 | &autoscan_periodic_ops, | |
32 | #endif /* CONFIG_AUTOSCAN_PERIODIC */ | |
7c865c68 TB |
33 | NULL |
34 | }; | |
35 | ||
36 | ||
37 | static void request_scan(struct wpa_supplicant *wpa_s) | |
38 | { | |
4115303b | 39 | wpa_s->scan_req = MANUAL_SCAN_REQ; |
7c865c68 TB |
40 | |
41 | if (wpa_supplicant_req_sched_scan(wpa_s)) | |
42 | wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0); | |
43 | } | |
44 | ||
45 | ||
99218999 | 46 | int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan) |
7c865c68 TB |
47 | { |
48 | const char *name = wpa_s->conf->autoscan; | |
49 | const char *params; | |
50 | size_t nlen; | |
51 | int i; | |
52 | const struct autoscan_ops *ops = NULL; | |
53 | ||
54 | if (wpa_s->autoscan && wpa_s->autoscan_priv) | |
55 | return 0; | |
56 | ||
57 | if (name == NULL) | |
58 | return 0; | |
59 | ||
60 | params = os_strchr(name, ':'); | |
61 | if (params == NULL) { | |
62 | params = ""; | |
63 | nlen = os_strlen(name); | |
64 | } else { | |
65 | nlen = params - name; | |
66 | params++; | |
67 | } | |
68 | ||
69 | for (i = 0; autoscan_modules[i]; i++) { | |
70 | if (os_strncmp(name, autoscan_modules[i]->name, nlen) == 0) { | |
71 | ops = autoscan_modules[i]; | |
72 | break; | |
73 | } | |
74 | } | |
75 | ||
76 | if (ops == NULL) { | |
77 | wpa_printf(MSG_ERROR, "autoscan: Could not find module " | |
78 | "matching the parameter '%s'", name); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | wpa_s->autoscan_params = NULL; | |
83 | ||
84 | wpa_s->autoscan_priv = ops->init(wpa_s, params); | |
85 | if (wpa_s->autoscan_priv == NULL) | |
86 | return -1; | |
87 | wpa_s->autoscan = ops; | |
88 | ||
89 | wpa_printf(MSG_DEBUG, "autoscan: Initialized module '%s' with " | |
90 | "parameters '%s'", ops->name, params); | |
99218999 JM |
91 | if (!req_scan) |
92 | return 0; | |
7c865c68 TB |
93 | |
94 | /* | |
95 | * Cancelling existing scan requests, if any. | |
96 | */ | |
97 | wpa_supplicant_cancel_sched_scan(wpa_s); | |
98 | wpa_supplicant_cancel_scan(wpa_s); | |
99 | ||
100 | /* | |
101 | * Firing first scan, which will lead to call autoscan_notify_scan. | |
102 | */ | |
103 | request_scan(wpa_s); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | ||
109 | void autoscan_deinit(struct wpa_supplicant *wpa_s) | |
110 | { | |
111 | if (wpa_s->autoscan && wpa_s->autoscan_priv) { | |
112 | wpa_printf(MSG_DEBUG, "autoscan: Deinitializing module '%s'", | |
113 | wpa_s->autoscan->name); | |
114 | wpa_s->autoscan->deinit(wpa_s->autoscan_priv); | |
115 | wpa_s->autoscan = NULL; | |
116 | wpa_s->autoscan_priv = NULL; | |
117 | ||
118 | wpa_s->scan_interval = 5; | |
119 | wpa_s->sched_scan_interval = 0; | |
120 | } | |
121 | } | |
122 | ||
123 | ||
124 | int autoscan_notify_scan(struct wpa_supplicant *wpa_s, | |
125 | struct wpa_scan_results *scan_res) | |
126 | { | |
127 | int interval; | |
128 | ||
129 | if (wpa_s->autoscan && wpa_s->autoscan_priv) { | |
130 | interval = wpa_s->autoscan->notify_scan(wpa_s->autoscan_priv, | |
131 | scan_res); | |
132 | ||
133 | if (interval <= 0) | |
134 | return -1; | |
135 | ||
136 | wpa_s->scan_interval = interval; | |
137 | wpa_s->sched_scan_interval = interval; | |
138 | ||
139 | request_scan(wpa_s); | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } |