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 18 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL 19 extern const struct autoscan_ops autoscan_exponential_ops; 20 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */ 21 22 #ifdef CONFIG_AUTOSCAN_PERIODIC 23 extern const struct autoscan_ops autoscan_periodic_ops; 24 #endif /* CONFIG_AUTOSCAN_PERIODIC */ 25 26 static const struct autoscan_ops * autoscan_modules[] = { 27 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL 28 &autoscan_exponential_ops, 29 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */ 30 #ifdef CONFIG_AUTOSCAN_PERIODIC 31 &autoscan_periodic_ops, 32 #endif /* CONFIG_AUTOSCAN_PERIODIC */ 33 NULL 34 }; 35 36 37 static void request_scan(struct wpa_supplicant *wpa_s) 38 { 39 wpa_s->scan_req = MANUAL_SCAN_REQ; 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 46 int autoscan_init(struct wpa_supplicant *wpa_s, int req_scan) 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); 91 if (!req_scan) 92 return 0; 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 } 144
