xref: /freebsd/contrib/wpa/wpa_supplicant/bgscan.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
1 /*
2  * WPA Supplicant - background scan and roaming interface
3  * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
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 "config_ssid.h"
14 #include "bgscan.h"
15 
16 #ifdef CONFIG_BGSCAN_SIMPLE
17 extern const struct bgscan_ops bgscan_simple_ops;
18 #endif /* CONFIG_BGSCAN_SIMPLE */
19 #ifdef CONFIG_BGSCAN_LEARN
20 extern const struct bgscan_ops bgscan_learn_ops;
21 #endif /* CONFIG_BGSCAN_LEARN */
22 
23 static const struct bgscan_ops * bgscan_modules[] = {
24 #ifdef CONFIG_BGSCAN_SIMPLE
25 	&bgscan_simple_ops,
26 #endif /* CONFIG_BGSCAN_SIMPLE */
27 #ifdef CONFIG_BGSCAN_LEARN
28 	&bgscan_learn_ops,
29 #endif /* CONFIG_BGSCAN_LEARN */
30 	NULL
31 };
32 
33 
34 int bgscan_init(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
35 {
36 	const char *name = ssid->bgscan;
37 	const char *params;
38 	size_t nlen;
39 	int i;
40 	const struct bgscan_ops *ops = NULL;
41 
42 	bgscan_deinit(wpa_s);
43 	if (name == NULL)
44 		return 0;
45 
46 	params = os_strchr(name, ':');
47 	if (params == NULL) {
48 		params = "";
49 		nlen = os_strlen(name);
50 	} else {
51 		nlen = params - name;
52 		params++;
53 	}
54 
55 	for (i = 0; bgscan_modules[i]; i++) {
56 		if (os_strncmp(name, bgscan_modules[i]->name, nlen) == 0) {
57 			ops = bgscan_modules[i];
58 			break;
59 		}
60 	}
61 
62 	if (ops == NULL) {
63 		wpa_printf(MSG_ERROR, "bgscan: Could not find module "
64 			   "matching the parameter '%s'", name);
65 		return -1;
66 	}
67 
68 	wpa_s->bgscan_priv = ops->init(wpa_s, params, ssid);
69 	if (wpa_s->bgscan_priv == NULL)
70 		return -1;
71 	wpa_s->bgscan = ops;
72 	wpa_printf(MSG_DEBUG, "bgscan: Initialized module '%s' with "
73 		   "parameters '%s'", ops->name, params);
74 
75 	return 0;
76 }
77 
78 
79 void bgscan_deinit(struct wpa_supplicant *wpa_s)
80 {
81 	if (wpa_s->bgscan && wpa_s->bgscan_priv) {
82 		wpa_printf(MSG_DEBUG, "bgscan: Deinitializing module '%s'",
83 			   wpa_s->bgscan->name);
84 		wpa_s->bgscan->deinit(wpa_s->bgscan_priv);
85 		wpa_s->bgscan = NULL;
86 		wpa_s->bgscan_priv = NULL;
87 	}
88 }
89 
90 
91 int bgscan_notify_scan(struct wpa_supplicant *wpa_s,
92 		       struct wpa_scan_results *scan_res)
93 {
94 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
95 		return wpa_s->bgscan->notify_scan(wpa_s->bgscan_priv,
96 						  scan_res);
97 	return 0;
98 }
99 
100 
101 void bgscan_notify_beacon_loss(struct wpa_supplicant *wpa_s)
102 {
103 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
104 		wpa_s->bgscan->notify_beacon_loss(wpa_s->bgscan_priv);
105 }
106 
107 
108 void bgscan_notify_signal_change(struct wpa_supplicant *wpa_s, int above,
109 				 int current_signal, int current_noise,
110 				 int current_txrate)
111 {
112 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
113 		wpa_s->bgscan->notify_signal_change(wpa_s->bgscan_priv, above,
114 						    current_signal,
115 						    current_noise,
116 						    current_txrate);
117 }
118