wpa_supplicant/bgscan.c

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