hostapd: Handle Neighbor Report Request frame
Process Neighbor Report Request frame and send Neighbor Report Response frame based on the configured neighbor report data. Signed-off-by: David Spinadel <david.spinadel@intel.com>master
David Spinadel
8 years ago
committed by
Jouni Malinen
parent
061269b316
commit
2572df34b2
@ -0,0 +1,240 @@
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/*
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* hostapd / Radio Measurement (RRM)
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* Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
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* Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "hostapd.h"
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#include "ap_drv_ops.h"
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#include "rrm.h"
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static u16 hostapd_parse_location_lci_req_age(const u8 *buf, size_t len)
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{
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const u8 *subelem;
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/* Range Request element + Location Subject + Maximum Age subelement */
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if (len < 3 + 1 + 4)
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return 0;
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/* Subelements are arranged as IEs */
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subelem = get_ie(buf + 4, len - 4, LCI_REQ_SUBELEM_MAX_AGE);
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if (subelem && subelem[1] == 2)
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return *(u16 *) (subelem + 2);
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return 0;
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}
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static int hostapd_check_lci_age(struct hostapd_neighbor_entry *nr, u16 max_age)
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{
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struct os_time curr, diff;
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unsigned long diff_l;
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if (!max_age)
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return 0;
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if (max_age == 0xffff)
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return 1;
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if (os_get_time(&curr))
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return 0;
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os_time_sub(&curr, &nr->lci_date, &diff);
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/* avoid overflow */
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if (diff.sec > 0xffff)
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return 0;
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/* LCI age is calculated in 10th of a second units. */
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diff_l = diff.sec * 10 + diff.usec / 100000;
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return max_age > diff_l;
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}
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static size_t hostapd_neighbor_report_len(struct wpabuf *buf,
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struct hostapd_neighbor_entry *nr,
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int send_lci, int send_civic)
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{
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size_t len = 2 + wpabuf_len(nr->nr);
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if (send_lci && nr->lci)
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len += 2 + wpabuf_len(nr->lci);
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if (send_civic && nr->civic)
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len += 2 + wpabuf_len(nr->civic);
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return len;
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}
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static void hostapd_send_nei_report_resp(struct hostapd_data *hapd,
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const u8 *addr, u8 dialog_token,
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struct wpa_ssid_value *ssid, u8 lci,
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u8 civic, u16 lci_max_age)
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{
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struct hostapd_neighbor_entry *nr;
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struct wpabuf *buf;
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u8 *msmt_token;
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/*
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* The number and length of the Neighbor Report elements in a Neighbor
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* Report frame is limited by the maximum allowed MMPDU size; + 3 bytes
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* of RRM header.
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*/
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buf = wpabuf_alloc(3 + IEEE80211_MAX_MMPDU_SIZE);
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if (!buf)
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return;
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wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
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wpabuf_put_u8(buf, WLAN_RRM_NEIGHBOR_REPORT_RESPONSE);
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wpabuf_put_u8(buf, dialog_token);
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dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
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list) {
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int send_lci;
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size_t len;
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if (ssid->ssid_len != nr->ssid.ssid_len ||
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os_memcmp(ssid->ssid, nr->ssid.ssid, ssid->ssid_len) != 0)
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continue;
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send_lci = (lci != 0) && hostapd_check_lci_age(nr, lci_max_age);
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len = hostapd_neighbor_report_len(buf, nr, send_lci, civic);
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if (len - 2 > 0xff) {
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wpa_printf(MSG_DEBUG,
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"NR entry for " MACSTR " exceeds 0xFF bytes",
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MAC2STR(nr->bssid));
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continue;
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}
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if (len > wpabuf_tailroom(buf))
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break;
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wpabuf_put_u8(buf, WLAN_EID_NEIGHBOR_REPORT);
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wpabuf_put_u8(buf, len - 2);
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wpabuf_put_buf(buf, nr->nr);
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if (send_lci && nr->lci) {
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wpabuf_put_u8(buf, WLAN_EID_MEASURE_REPORT);
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wpabuf_put_u8(buf, wpabuf_len(nr->lci));
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/*
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* Override measurement token - the first byte of the
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* Measurement Report element.
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*/
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msmt_token = wpabuf_put(buf, 0);
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wpabuf_put_buf(buf, nr->lci);
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*msmt_token = lci;
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}
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if (civic && nr->civic) {
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wpabuf_put_u8(buf, WLAN_EID_MEASURE_REPORT);
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wpabuf_put_u8(buf, wpabuf_len(nr->civic));
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/*
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* Override measurement token - the first byte of the
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* Measurement Report element.
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*/
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msmt_token = wpabuf_put(buf, 0);
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wpabuf_put_buf(buf, nr->civic);
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*msmt_token = civic;
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}
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}
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hostapd_drv_send_action(hapd, hapd->iface->freq, 0, addr,
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wpabuf_head(buf), wpabuf_len(buf));
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wpabuf_free(buf);
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}
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static void hostapd_handle_nei_report_req(struct hostapd_data *hapd,
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const u8 *buf, size_t len)
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{
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const struct ieee80211_mgmt *mgmt = (const struct ieee80211_mgmt *) buf;
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const u8 *pos, *ie, *end;
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struct wpa_ssid_value ssid = {
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.ssid_len = 0
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};
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u8 token;
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u8 lci = 0, civic = 0; /* Measurement tokens */
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u16 lci_max_age = 0;
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if (!(hapd->conf->radio_measurements[0] &
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WLAN_RRM_CAPS_NEIGHBOR_REPORT))
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return;
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end = buf + len;
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token = mgmt->u.action.u.rrm.dialog_token;
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pos = mgmt->u.action.u.rrm.variable;
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len = end - pos;
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ie = get_ie(pos, len, WLAN_EID_SSID);
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if (ie && ie[1] && ie[1] <= SSID_MAX_LEN) {
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ssid.ssid_len = ie[1];
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os_memcpy(ssid.ssid, ie + 2, ssid.ssid_len);
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} else {
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ssid.ssid_len = hapd->conf->ssid.ssid_len;
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os_memcpy(ssid.ssid, hapd->conf->ssid.ssid, ssid.ssid_len);
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}
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while ((ie = get_ie(pos, len, WLAN_EID_MEASURE_REQUEST))) {
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if (ie[1] < 3)
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break;
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wpa_printf(MSG_DEBUG,
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"Neighbor report request, measure type %u",
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ie[4]);
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switch (ie[4]) { /* Measurement Type */
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case MEASURE_TYPE_LCI:
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lci = ie[2]; /* Measurement Token */
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lci_max_age = hostapd_parse_location_lci_req_age(ie + 2,
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ie[1]);
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break;
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case MEASURE_TYPE_LOCATION_CIVIC:
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civic = ie[2]; /* Measurement token */
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break;
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}
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pos = ie + ie[1] + 2;
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len = end - pos;
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}
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hostapd_send_nei_report_resp(hapd, mgmt->sa, token, &ssid, lci, civic,
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lci_max_age);
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}
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void hostapd_handle_radio_measurement(struct hostapd_data *hapd,
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const u8 *buf, size_t len)
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{
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const struct ieee80211_mgmt *mgmt = (const struct ieee80211_mgmt *) buf;
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/*
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* Check for enough bytes: header + (1B)Category + (1B)Action +
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* (1B)Dialog Token.
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*/
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if (len < IEEE80211_HDRLEN + 3)
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return;
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wpa_printf(MSG_DEBUG, "Radio measurement frame, action %u from " MACSTR,
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mgmt->u.action.u.rrm.action, MAC2STR(mgmt->sa));
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switch (mgmt->u.action.u.rrm.action) {
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case WLAN_RRM_NEIGHBOR_REPORT_REQUEST:
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hostapd_handle_nei_report_req(hapd, buf, len);
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break;
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default:
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wpa_printf(MSG_DEBUG, "RRM action %u is not supported",
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mgmt->u.action.u.rrm.action);
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break;
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}
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}
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@ -0,0 +1,16 @@
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/*
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* hostapd / Radio Measurement (RRM)
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* Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
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* Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#ifndef RRM_H
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#define RRM_H
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void hostapd_handle_radio_measurement(struct hostapd_data *hapd,
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const u8 *buf, size_t len);
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#endif /* RRM_H */
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