--- /dev/null
+/*
+ * hostapd / Radio Measurement (RRM)
+ * Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
+ * Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "hostapd.h"
+#include "ap_drv_ops.h"
+#include "rrm.h"
+
+
+static u16 hostapd_parse_location_lci_req_age(const u8 *buf, size_t len)
+{
+ const u8 *subelem;
+
+ /* Range Request element + Location Subject + Maximum Age subelement */
+ if (len < 3 + 1 + 4)
+ return 0;
+
+ /* Subelements are arranged as IEs */
+ subelem = get_ie(buf + 4, len - 4, LCI_REQ_SUBELEM_MAX_AGE);
+ if (subelem && subelem[1] == 2)
+ return *(u16 *) (subelem + 2);
+
+ return 0;
+}
+
+
+static int hostapd_check_lci_age(struct hostapd_neighbor_entry *nr, u16 max_age)
+{
+ struct os_time curr, diff;
+ unsigned long diff_l;
+
+ if (!max_age)
+ return 0;
+
+ if (max_age == 0xffff)
+ return 1;
+
+ if (os_get_time(&curr))
+ return 0;
+
+ os_time_sub(&curr, &nr->lci_date, &diff);
+
+ /* avoid overflow */
+ if (diff.sec > 0xffff)
+ return 0;
+
+ /* LCI age is calculated in 10th of a second units. */
+ diff_l = diff.sec * 10 + diff.usec / 100000;
+
+ return max_age > diff_l;
+}
+
+
+static size_t hostapd_neighbor_report_len(struct wpabuf *buf,
+ struct hostapd_neighbor_entry *nr,
+ int send_lci, int send_civic)
+{
+ size_t len = 2 + wpabuf_len(nr->nr);
+
+ if (send_lci && nr->lci)
+ len += 2 + wpabuf_len(nr->lci);
+
+ if (send_civic && nr->civic)
+ len += 2 + wpabuf_len(nr->civic);
+
+ return len;
+}
+
+
+static void hostapd_send_nei_report_resp(struct hostapd_data *hapd,
+ const u8 *addr, u8 dialog_token,
+ struct wpa_ssid_value *ssid, u8 lci,
+ u8 civic, u16 lci_max_age)
+{
+ struct hostapd_neighbor_entry *nr;
+ struct wpabuf *buf;
+ u8 *msmt_token;
+
+ /*
+ * The number and length of the Neighbor Report elements in a Neighbor
+ * Report frame is limited by the maximum allowed MMPDU size; + 3 bytes
+ * of RRM header.
+ */
+ buf = wpabuf_alloc(3 + IEEE80211_MAX_MMPDU_SIZE);
+ if (!buf)
+ return;
+
+ wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
+ wpabuf_put_u8(buf, WLAN_RRM_NEIGHBOR_REPORT_RESPONSE);
+ wpabuf_put_u8(buf, dialog_token);
+
+ dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
+ list) {
+ int send_lci;
+ size_t len;
+
+ if (ssid->ssid_len != nr->ssid.ssid_len ||
+ os_memcmp(ssid->ssid, nr->ssid.ssid, ssid->ssid_len) != 0)
+ continue;
+
+ send_lci = (lci != 0) && hostapd_check_lci_age(nr, lci_max_age);
+ len = hostapd_neighbor_report_len(buf, nr, send_lci, civic);
+
+ if (len - 2 > 0xff) {
+ wpa_printf(MSG_DEBUG,
+ "NR entry for " MACSTR " exceeds 0xFF bytes",
+ MAC2STR(nr->bssid));
+ continue;
+ }
+
+ if (len > wpabuf_tailroom(buf))
+ break;
+
+ wpabuf_put_u8(buf, WLAN_EID_NEIGHBOR_REPORT);
+ wpabuf_put_u8(buf, len - 2);
+ wpabuf_put_buf(buf, nr->nr);
+
+ if (send_lci && nr->lci) {
+ wpabuf_put_u8(buf, WLAN_EID_MEASURE_REPORT);
+ wpabuf_put_u8(buf, wpabuf_len(nr->lci));
+ /*
+ * Override measurement token - the first byte of the
+ * Measurement Report element.
+ */
+ msmt_token = wpabuf_put(buf, 0);
+ wpabuf_put_buf(buf, nr->lci);
+ *msmt_token = lci;
+ }
+
+ if (civic && nr->civic) {
+ wpabuf_put_u8(buf, WLAN_EID_MEASURE_REPORT);
+ wpabuf_put_u8(buf, wpabuf_len(nr->civic));
+ /*
+ * Override measurement token - the first byte of the
+ * Measurement Report element.
+ */
+ msmt_token = wpabuf_put(buf, 0);
+ wpabuf_put_buf(buf, nr->civic);
+ *msmt_token = civic;
+ }
+ }
+
+ hostapd_drv_send_action(hapd, hapd->iface->freq, 0, addr,
+ wpabuf_head(buf), wpabuf_len(buf));
+ wpabuf_free(buf);
+}
+
+
+static void hostapd_handle_nei_report_req(struct hostapd_data *hapd,
+ const u8 *buf, size_t len)
+{
+ const struct ieee80211_mgmt *mgmt = (const struct ieee80211_mgmt *) buf;
+ const u8 *pos, *ie, *end;
+ struct wpa_ssid_value ssid = {
+ .ssid_len = 0
+ };
+ u8 token;
+ u8 lci = 0, civic = 0; /* Measurement tokens */
+ u16 lci_max_age = 0;
+
+ if (!(hapd->conf->radio_measurements[0] &
+ WLAN_RRM_CAPS_NEIGHBOR_REPORT))
+ return;
+
+ end = buf + len;
+
+ token = mgmt->u.action.u.rrm.dialog_token;
+ pos = mgmt->u.action.u.rrm.variable;
+ len = end - pos;
+
+ ie = get_ie(pos, len, WLAN_EID_SSID);
+ if (ie && ie[1] && ie[1] <= SSID_MAX_LEN) {
+ ssid.ssid_len = ie[1];
+ os_memcpy(ssid.ssid, ie + 2, ssid.ssid_len);
+ } else {
+ ssid.ssid_len = hapd->conf->ssid.ssid_len;
+ os_memcpy(ssid.ssid, hapd->conf->ssid.ssid, ssid.ssid_len);
+ }
+
+ while ((ie = get_ie(pos, len, WLAN_EID_MEASURE_REQUEST))) {
+ if (ie[1] < 3)
+ break;
+
+ wpa_printf(MSG_DEBUG,
+ "Neighbor report request, measure type %u",
+ ie[4]);
+
+ switch (ie[4]) { /* Measurement Type */
+ case MEASURE_TYPE_LCI:
+ lci = ie[2]; /* Measurement Token */
+ lci_max_age = hostapd_parse_location_lci_req_age(ie + 2,
+ ie[1]);
+ break;
+ case MEASURE_TYPE_LOCATION_CIVIC:
+ civic = ie[2]; /* Measurement token */
+ break;
+ }
+
+ pos = ie + ie[1] + 2;
+ len = end - pos;
+ }
+
+ hostapd_send_nei_report_resp(hapd, mgmt->sa, token, &ssid, lci, civic,
+ lci_max_age);
+}
+
+
+void hostapd_handle_radio_measurement(struct hostapd_data *hapd,
+ const u8 *buf, size_t len)
+{
+ const struct ieee80211_mgmt *mgmt = (const struct ieee80211_mgmt *) buf;
+
+ /*
+ * Check for enough bytes: header + (1B)Category + (1B)Action +
+ * (1B)Dialog Token.
+ */
+ if (len < IEEE80211_HDRLEN + 3)
+ return;
+
+ wpa_printf(MSG_DEBUG, "Radio measurement frame, action %u from " MACSTR,
+ mgmt->u.action.u.rrm.action, MAC2STR(mgmt->sa));
+
+ switch (mgmt->u.action.u.rrm.action) {
+ case WLAN_RRM_NEIGHBOR_REPORT_REQUEST:
+ hostapd_handle_nei_report_req(hapd, buf, len);
+ break;
+ default:
+ wpa_printf(MSG_DEBUG, "RRM action %u is not supported",
+ mgmt->u.action.u.rrm.action);
+ break;
+ }
+}
projects / mech_eap.git / commitdiff