/* Compare function for sorting scan results. Return >0 if @b is considered * better. */ static int wpa_scan_result_compar(const void *a, const void *b) { struct wpa_scan_res **_wa = (void *) a; struct wpa_scan_res **_wb = (void *) b; struct wpa_scan_res *wa = *_wa; struct wpa_scan_res *wb = *_wb; int wpa_a, wpa_b, maxrate_a, maxrate_b; /* WPA/WPA2 support preferred */ wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; if (wpa_b && !wpa_a) return 1; if (!wpa_b && wpa_a) return -1; /* privacy support preferred */ if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && (wb->caps & IEEE80211_CAP_PRIVACY)) return 1; if ((wa->caps & IEEE80211_CAP_PRIVACY) && (wb->caps & IEEE80211_CAP_PRIVACY) == 0) return -1; /* best/max rate preferred if signal level close enough XXX */ if ((wa->level && wb->level && abs(wb->level - wa->level) < 5) || (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { maxrate_a = wpa_scan_get_max_rate(wa); maxrate_b = wpa_scan_get_max_rate(wb); if (maxrate_a != maxrate_b) return maxrate_b - maxrate_a; } /* use freq for channel preference */ /* all things being equal, use signal level; if signal levels are * identical, use quality values since some drivers may only report * that value and leave the signal level zero */ if (wb->level == wa->level) return wb->qual - wa->qual; return wb->level - wa->level; }
/* Compare function for sorting scan results. Return >0 if @b is considered * better. */ static int wpa_scan_result_compar(const void *a, const void *b) { #define IS_5GHZ(n) (n > 4000) #define MIN(a,b) a < b ? a : b struct wpa_scan_res **_wa = (void *) a; struct wpa_scan_res **_wb = (void *) b; struct wpa_scan_res *wa = *_wa; struct wpa_scan_res *wb = *_wb; int wpa_a, wpa_b, maxrate_a, maxrate_b; int snr_a, snr_b; /* WPA/WPA2 support preferred */ wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL || wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL; wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL || wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL; if (wpa_b && !wpa_a) return 1; if (!wpa_b && wpa_a) return -1; /* privacy support preferred */ if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 && (wb->caps & IEEE80211_CAP_PRIVACY)) return 1; if ((wa->caps & IEEE80211_CAP_PRIVACY) && (wb->caps & IEEE80211_CAP_PRIVACY) == 0) return -1; if ((wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) && !((wa->flags | wb->flags) & WPA_SCAN_NOISE_INVALID)) { snr_a = MIN(wa->level - wa->noise, GREAT_SNR); snr_b = MIN(wb->level - wb->noise, GREAT_SNR); } else { /* Not suitable information to calculate SNR, so use level */ snr_a = wa->level; snr_b = wb->level; } /* best/max rate preferred if SNR close enough */ if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) || (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) { maxrate_a = wpa_scan_get_max_rate(wa); maxrate_b = wpa_scan_get_max_rate(wb); if (maxrate_a != maxrate_b) return maxrate_b - maxrate_a; if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq)) return IS_5GHZ(wa->freq) ? -1 : 1; } /* use freq for channel preference */ /* all things being equal, use SNR; if SNRs are * identical, use quality values since some drivers may only report * that value and leave the signal level zero */ if (snr_b == snr_a) return wb->qual - wa->qual; return snr_b - snr_a; #undef MIN #undef IS_5GHZ }
/** * wpas_dbus_bssid_properties - Return the properties of a scanned network * @message: Pointer to incoming dbus message * @wpa_s: wpa_supplicant structure for a network interface * @res: wpa_supplicant scan result for which to get properties * Returns: a dbus message containing the properties for the requested network * * Handler function for "properties" method call of a scanned network. * Returns a dbus message containing the the properties. */ DBusMessage * wpas_dbus_bssid_properties(DBusMessage *message, struct wpa_supplicant *wpa_s, struct wpa_scan_res *res) { DBusMessage *reply = NULL; DBusMessageIter iter, iter_dict; const u8 *ie; /* Dump the properties into a dbus message */ reply = dbus_message_new_method_return(message); dbus_message_iter_init_append(reply, &iter); if (!wpa_dbus_dict_open_write(&iter, &iter_dict)) goto error; if (!wpa_dbus_dict_append_byte_array(&iter_dict, "bssid", (const char *) res->bssid, ETH_ALEN)) goto error; ie = wpa_scan_get_ie(res, WLAN_EID_SSID); if (ie) { if (!wpa_dbus_dict_append_byte_array(&iter_dict, "ssid", (const char *) (ie + 2), ie[1])) goto error; } ie = wpa_scan_get_vendor_ie(res, WPA_IE_VENDOR_TYPE); if (ie) { if (!wpa_dbus_dict_append_byte_array(&iter_dict, "wpaie", (const char *) ie, ie[1] + 2)) goto error; } ie = wpa_scan_get_ie(res, WLAN_EID_RSN); if (ie) { if (!wpa_dbus_dict_append_byte_array(&iter_dict, "rsnie", (const char *) ie, ie[1] + 2)) goto error; } ie = wpa_scan_get_vendor_ie(res, WPS_IE_VENDOR_TYPE); if (ie) { if (!wpa_dbus_dict_append_byte_array(&iter_dict, "wpsie", (const char *) ie, ie[1] + 2)) goto error; } if (res->freq) { if (!wpa_dbus_dict_append_int32(&iter_dict, "frequency", res->freq)) goto error; } if (!wpa_dbus_dict_append_uint16(&iter_dict, "capabilities", res->caps)) goto error; if (!wpa_dbus_dict_append_int32(&iter_dict, "quality", res->qual)) goto error; if (!wpa_dbus_dict_append_int32(&iter_dict, "noise", res->noise)) goto error; if (!wpa_dbus_dict_append_int32(&iter_dict, "level", res->level)) goto error; if (!wpa_dbus_dict_append_int32(&iter_dict, "maxrate", wpa_scan_get_max_rate(res) * 500000)) goto error; if (!wpa_dbus_dict_close_write(&iter, &iter_dict)) goto error; return reply; error: if (reply) dbus_message_unref(reply); return dbus_message_new_error(message, WPAS_ERROR_INTERNAL_ERROR, "an internal error occurred returning " "BSSID properties."); }