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      1 /*
      2  * WPA Supplicant - background scan and roaming interface
      3  * Copyright (c) 2009-2010, Jouni Malinen <j (at) 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