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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 program is free software; you can redistribute it and/or modify
      6  * it under the terms of the GNU General Public License version 2 as
      7  * published by the Free Software Foundation.
      8  *
      9  * Alternatively, this software may be distributed under the terms of BSD
     10  * license.
     11  *
     12  * See README and COPYING for more details.
     13  */
     14 
     15 #include "includes.h"
     16 
     17 #include "common.h"
     18 #include "wpa_supplicant_i.h"
     19 #include "config_ssid.h"
     20 #include "bgscan.h"
     21 
     22 #ifdef CONFIG_BGSCAN_SIMPLE
     23 extern const struct bgscan_ops bgscan_simple_ops;
     24 #endif /* CONFIG_BGSCAN_SIMPLE */
     25 #ifdef CONFIG_BGSCAN_LEARN
     26 extern const struct bgscan_ops bgscan_learn_ops;
     27 #endif /* CONFIG_BGSCAN_LEARN */
     28 
     29 static const struct bgscan_ops * bgscan_modules[] = {
     30 #ifdef CONFIG_BGSCAN_SIMPLE
     31 	&bgscan_simple_ops,
     32 #endif /* CONFIG_BGSCAN_SIMPLE */
     33 #ifdef CONFIG_BGSCAN_LEARN
     34 	&bgscan_learn_ops,
     35 #endif /* CONFIG_BGSCAN_LEARN */
     36 	NULL
     37 };
     38 
     39 
     40 int bgscan_init(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
     41 {
     42 	const char *name = ssid->bgscan;
     43 	const char *params;
     44 	size_t nlen;
     45 	int i;
     46 	const struct bgscan_ops *ops = NULL;
     47 
     48 	bgscan_deinit(wpa_s);
     49 	if (name == NULL)
     50 		return 0;
     51 
     52 	params = os_strchr(name, ':');
     53 	if (params == NULL) {
     54 		params = "";
     55 		nlen = os_strlen(name);
     56 	} else {
     57 		nlen = params - name;
     58 		params++;
     59 	}
     60 
     61 	for (i = 0; bgscan_modules[i]; i++) {
     62 		if (os_strncmp(name, bgscan_modules[i]->name, nlen) == 0) {
     63 			ops = bgscan_modules[i];
     64 			break;
     65 		}
     66 	}
     67 
     68 	if (ops == NULL) {
     69 		wpa_printf(MSG_ERROR, "bgscan: Could not find module "
     70 			   "matching the parameter '%s'", name);
     71 		return -1;
     72 	}
     73 
     74 	wpa_s->bgscan_priv = ops->init(wpa_s, params, ssid);
     75 	if (wpa_s->bgscan_priv == NULL)
     76 		return -1;
     77 	wpa_s->bgscan = ops;
     78 	wpa_printf(MSG_DEBUG, "bgscan: Initialized module '%s' with "
     79 		   "parameters '%s'", ops->name, params);
     80 
     81 	return 0;
     82 }
     83 
     84 
     85 void bgscan_deinit(struct wpa_supplicant *wpa_s)
     86 {
     87 	if (wpa_s->bgscan && wpa_s->bgscan_priv) {
     88 		wpa_printf(MSG_DEBUG, "bgscan: Deinitializing module '%s'",
     89 			   wpa_s->bgscan->name);
     90 		wpa_s->bgscan->deinit(wpa_s->bgscan_priv);
     91 		wpa_s->bgscan = NULL;
     92 		wpa_s->bgscan_priv = NULL;
     93 	}
     94 }
     95 
     96 
     97 int bgscan_notify_scan(struct wpa_supplicant *wpa_s,
     98 		       struct wpa_scan_results *scan_res)
     99 {
    100 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
    101 		return wpa_s->bgscan->notify_scan(wpa_s->bgscan_priv,
    102 						  scan_res);
    103 	return 0;
    104 }
    105 
    106 
    107 void bgscan_notify_beacon_loss(struct wpa_supplicant *wpa_s)
    108 {
    109 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
    110 		wpa_s->bgscan->notify_beacon_loss(wpa_s->bgscan_priv);
    111 }
    112 
    113 
    114 void bgscan_notify_signal_change(struct wpa_supplicant *wpa_s, int above,
    115 				 int current_signal, int current_noise,
    116 				 int current_txrate)
    117 {
    118 	if (wpa_s->bgscan && wpa_s->bgscan_priv)
    119 		wpa_s->bgscan->notify_signal_change(wpa_s->bgscan_priv, above,
    120 						    current_signal,
    121 						    current_noise,
    122 						    current_txrate);
    123 }
    124