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/*
* wpa_supplicant - Radio Measurements
* Copyright (c) 2003-2016, Jouni Malinen <j@w1.fi>
*
* 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 "utils/bitfield.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "wpa_supplicant_i.h"
#include "bss.h"
#include "rrm.h"
#include "scan.h"
#include <sys/errno.h>
#ifdef ESP_SUPPLICANT
#include "esp_common_i.h"
#endif
static void wpas_rrm_neighbor_rep_timeout_handler(void *data, void *user_ctx)
{
struct rrm_data *rrm = data;
if (!rrm->notify_neighbor_rep) {
wpa_printf(MSG_ERROR,
"RRM: Unexpected neighbor report timeout");
return;
}
wpa_printf(MSG_DEBUG, "RRM: Notifying neighbor report - NONE");
rrm->notify_neighbor_rep(rrm->neighbor_rep_cb_ctx, NULL, 0);
rrm->notify_neighbor_rep = NULL;
rrm->neighbor_rep_cb_ctx = NULL;
}
/*
* wpas_rrm_reset - Clear and reset all RRM data in wpa_supplicant
* @wpa_s: Pointer to wpa_supplicant
*/
void wpas_rrm_reset(struct wpa_supplicant *wpa_s)
{
wpa_s->rrm.rrm_used = 0;
eloop_cancel_timeout(wpas_rrm_neighbor_rep_timeout_handler, &wpa_s->rrm,
NULL);
if (wpa_s->rrm.notify_neighbor_rep)
wpas_rrm_neighbor_rep_timeout_handler(&wpa_s->rrm, NULL);
wpa_s->rrm.next_neighbor_rep_token = 1;
wpas_clear_beacon_rep_data(wpa_s);
}
/*
* wpas_rrm_process_neighbor_rep - Handle incoming neighbor report
* @wpa_s: Pointer to wpa_supplicant
* @report: Neighbor report buffer, prefixed by a 1-byte dialog token
* @report_len: Length of neighbor report buffer
*/
void wpas_rrm_process_neighbor_rep(struct wpa_supplicant *wpa_s,
const u8 *report, size_t report_len)
{
wpa_hexdump(MSG_DEBUG, "RRM: New Neighbor Report", report, report_len);
if (report_len < 1)
return;
if (report[0] != wpa_s->rrm.next_neighbor_rep_token - 1) {
wpa_printf(MSG_DEBUG,
"RRM: Discarding neighbor report with token %d (expected %d)",
report[0], wpa_s->rrm.next_neighbor_rep_token - 1);
return;
}
eloop_cancel_timeout(wpas_rrm_neighbor_rep_timeout_handler, &wpa_s->rrm,
NULL);
if (!wpa_s->rrm.notify_neighbor_rep) {
wpa_msg(wpa_s, MSG_INFO, "RRM: Unexpected neighbor report");
return;
}
wpa_printf(MSG_DEBUG, "RRM: Notifying neighbor report (token = %d)",
report[0]);
wpa_s->rrm.notify_neighbor_rep(wpa_s->rrm.neighbor_rep_cb_ctx,
report, report_len);
wpa_s->rrm.notify_neighbor_rep = NULL;
wpa_s->rrm.neighbor_rep_cb_ctx = NULL;
}
#if defined(__CYGWIN__) || defined(CONFIG_NATIVE_WINDOWS)
/* Workaround different, undefined for Windows, error codes used here */
#ifndef ENOTCONN
#define ENOTCONN -1
#endif
#ifndef EOPNOTSUPP
#define EOPNOTSUPP -1
#endif
#ifndef ECANCELED
#define ECANCELED -1
#endif
#endif
/* Measurement Request element + Location Subject + Maximum Age subelement */
#define MEASURE_REQUEST_LCI_LEN (3 + 1 + 4)
/* Measurement Request element + Location Civic Request */
#define MEASURE_REQUEST_CIVIC_LEN (3 + 5)
/**
* wpas_rrm_send_neighbor_rep_request - Request a neighbor report from our AP
* @wpa_s: Pointer to wpa_supplicant
* @ssid: if not null, this is sent in the request. Otherwise, no SSID IE
* is sent in the request.
* @lci: if set, neighbor request will include LCI request
* @civic: if set, neighbor request will include civic location request
* @cb: Callback function to be called once the requested report arrives, or
* timed out after RRM_NEIGHBOR_REPORT_TIMEOUT seconds.
* In the former case, 'neighbor_rep' is a newly allocated wpabuf, and it's
* the requester's responsibility to free it.
* In the latter case NULL will be sent in 'neighbor_rep'.
* @cb_ctx: Context value to send the callback function
* Returns: 0 in case of success, negative error code otherwise
*
* In case there is a previous request which has not been answered yet, the
* new request fails. The caller may retry after RRM_NEIGHBOR_REPORT_TIMEOUT.
* Request must contain a callback function.
*/
int wpas_rrm_send_neighbor_rep_request(struct wpa_supplicant *wpa_s,
const struct wpa_ssid_value *ssid,
int lci, int civic,
void (*cb)(void *ctx,
const u8 *neighbor_rep, size_t len),
void *cb_ctx)
{
struct wpabuf *buf;
if (!(wpa_s->rrm_ie[0] & WLAN_RRM_CAPS_NEIGHBOR_REPORT)) {
wpa_printf(MSG_ERROR,
"RRM: No network support for Neighbor Report.");
return -EOPNOTSUPP;
}
/* Refuse if there's a live request */
if (wpa_s->rrm.notify_neighbor_rep) {
wpa_dbg(wpa_s, MSG_DEBUG,
"RRM: Currently handling previous Neighbor Report.");
return -EBUSY;
}
/* 3 = action category + action code + dialog token */
buf = wpabuf_alloc(3 + (ssid ? 2 + ssid->ssid_len : 0) +
(lci ? 2 + MEASURE_REQUEST_LCI_LEN : 0) +
(civic ? 2 + MEASURE_REQUEST_CIVIC_LEN : 0));
if (buf == NULL) {
wpa_dbg(wpa_s, MSG_DEBUG,
"RRM: Failed to allocate Neighbor Report Request");
return -ENOMEM;
}
wpa_dbg(wpa_s, MSG_DEBUG,
"RRM: Neighbor report request (for %s), token=%d",
(ssid ? wpa_ssid_txt(ssid->ssid, ssid->ssid_len) : ""),
wpa_s->rrm.next_neighbor_rep_token);
wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
wpabuf_put_u8(buf, WLAN_RRM_NEIGHBOR_REPORT_REQUEST);
wpabuf_put_u8(buf, wpa_s->rrm.next_neighbor_rep_token);
if (ssid) {
wpabuf_put_u8(buf, WLAN_EID_SSID);
wpabuf_put_u8(buf, ssid->ssid_len);
wpabuf_put_data(buf, ssid->ssid, ssid->ssid_len);
}
if (lci) {
/* IEEE P802.11-REVmc/D5.0 9.4.2.21 */
wpabuf_put_u8(buf, WLAN_EID_MEASURE_REQUEST);
wpabuf_put_u8(buf, MEASURE_REQUEST_LCI_LEN);
/*
* Measurement token; nonzero number that is unique among the
* Measurement Request elements in a particular frame.
*/
wpabuf_put_u8(buf, 1); /* Measurement Token */
/*
* Parallel, Enable, Request, and Report bits are 0, Duration is
* reserved.
*/
wpabuf_put_u8(buf, 0); /* Measurement Request Mode */
wpabuf_put_u8(buf, MEASURE_TYPE_LCI); /* Measurement Type */
/* IEEE P802.11-REVmc/D5.0 9.4.2.21.10 - LCI request */
/* Location Subject */
wpabuf_put_u8(buf, LOCATION_SUBJECT_REMOTE);
/* Optional Subelements */
/*
* IEEE P802.11-REVmc/D5.0 Figure 9-170
* The Maximum Age subelement is required, otherwise the AP can
* send only data that was determined after receiving the
* request. Setting it here to unlimited age.
*/
wpabuf_put_u8(buf, LCI_REQ_SUBELEM_MAX_AGE);
wpabuf_put_u8(buf, 2);
wpabuf_put_le16(buf, 0xffff);
}
if (civic) {
/* IEEE P802.11-REVmc/D5.0 9.4.2.21 */
wpabuf_put_u8(buf, WLAN_EID_MEASURE_REQUEST);
wpabuf_put_u8(buf, MEASURE_REQUEST_CIVIC_LEN);
/*
* Measurement token; nonzero number that is unique among the
* Measurement Request elements in a particular frame.
*/
wpabuf_put_u8(buf, 2); /* Measurement Token */
/*
* Parallel, Enable, Request, and Report bits are 0, Duration is
* reserved.
*/
wpabuf_put_u8(buf, 0); /* Measurement Request Mode */
/* Measurement Type */
wpabuf_put_u8(buf, MEASURE_TYPE_LOCATION_CIVIC);
/* IEEE P802.11-REVmc/D5.0 9.4.2.21.14:
* Location Civic request */
/* Location Subject */
wpabuf_put_u8(buf, LOCATION_SUBJECT_REMOTE);
wpabuf_put_u8(buf, 0); /* Civic Location Type: IETF RFC 4776 */
/* Location Service Interval Units: Seconds */
wpabuf_put_u8(buf, 0);
/* Location Service Interval: 0 - Only one report is requested
*/
wpabuf_put_le16(buf, 0);
/* No optional subelements */
}
wpa_s->rrm.next_neighbor_rep_token++;
if (wpa_drv_send_action(wpa_s, 0, 0,
wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
wpa_dbg(wpa_s, MSG_DEBUG,
"RRM: Failed to send Neighbor Report Request");
wpabuf_free(buf);
return -ECANCELED;
}
wpa_s->rrm.neighbor_rep_cb_ctx = cb_ctx;
wpa_s->rrm.notify_neighbor_rep = cb;
eloop_register_timeout(RRM_NEIGHBOR_REPORT_TIMEOUT, 0,
wpas_rrm_neighbor_rep_timeout_handler,
&wpa_s->rrm, NULL);
wpabuf_free(buf);
return 0;
}
static int wpas_rrm_report_elem(struct wpabuf **buf, u8 token, u8 mode, u8 type,
const u8 *data, size_t data_len)
{
if (wpabuf_resize(buf, 5 + data_len))
return -1;
wpabuf_put_u8(*buf, WLAN_EID_MEASURE_REPORT);
wpabuf_put_u8(*buf, 3 + data_len);
wpabuf_put_u8(*buf, token);
wpabuf_put_u8(*buf, mode);
wpabuf_put_u8(*buf, type);
if (data_len)
wpabuf_put_data(*buf, data, data_len);
return 0;
}
static void wpas_rrm_send_msr_report_mpdu(struct wpa_supplicant *wpa_s,
const u8 *data, size_t len)
{
struct wpabuf *report = wpabuf_alloc(len + 3);
if (!report)
return;
wpabuf_put_u8(report, WLAN_ACTION_RADIO_MEASUREMENT);
wpabuf_put_u8(report, WLAN_RRM_RADIO_MEASUREMENT_REPORT);
wpabuf_put_u8(report, wpa_s->rrm.token);
wpabuf_put_data(report, data, len);
if (wpa_drv_send_action(wpa_s, 0, 0,
wpabuf_head(report), wpabuf_len(report), 0)) {
wpa_printf(MSG_ERROR,
"RRM: Radio measurement report failed: Sending Action frame failed");
}
wpabuf_free(report);
}
static int wpas_rrm_beacon_rep_update_last_frame(u8 *pos, size_t len)
{
struct rrm_measurement_report_element *msr_rep;
u8 *end = pos + len;
u8 *msr_rep_end;
struct rrm_measurement_beacon_report *rep = NULL;
u8 *subelem;
/* Find the last beacon report element */
while (end - pos >= (int) sizeof(*msr_rep)) {
msr_rep = (struct rrm_measurement_report_element *) pos;
msr_rep_end = pos + msr_rep->len + 2;
if (msr_rep->eid != WLAN_EID_MEASURE_REPORT ||
msr_rep_end > end) {
/* Should not happen. This indicates a bug. */
wpa_printf(MSG_ERROR,
"RRM: non-measurement report element in measurement report frame");
return -1;
}
if (msr_rep->type == MEASURE_TYPE_BEACON)
rep = (struct rrm_measurement_beacon_report *)
msr_rep->variable;
pos += pos[1] + 2;
}
if (!rep)
return 0;
subelem = rep->variable;
while (subelem + 2 < msr_rep_end &&
subelem[0] != WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION)
subelem += 2 + subelem[1];
if (subelem + 2 < msr_rep_end &&
subelem[0] == WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION &&
subelem[1] == 1 &&
subelem + BEACON_REPORT_LAST_INDICATION_SUBELEM_LEN <= end)
subelem[2] = 1;
return 0;
}
static void wpas_rrm_send_msr_report(struct wpa_supplicant *wpa_s,
struct wpabuf *buf)
{
int len = wpabuf_len(buf);
u8 *pos = wpabuf_mhead_u8(buf), *next = pos;
#define MPDU_REPORT_LEN (int) (IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN - 3)
while (len) {
int send_len = (len > MPDU_REPORT_LEN) ? next - pos : len;
if (send_len == len)
wpas_rrm_beacon_rep_update_last_frame(pos, len);
if (send_len == len ||
(send_len + next[1] + 2) > MPDU_REPORT_LEN) {
wpas_rrm_send_msr_report_mpdu(wpa_s, pos, send_len);
len -= send_len;
pos = next;
}
if (len)
next += next[1] + 2;
}
#undef MPDU_REPORT_LEN
}
static int wpas_get_op_chan_phy(int channel, const u8 *ies, size_t ies_len,
u8 *op_class, u8 *chan, u8 *phy_type)
{
const u8 *ie;
int sec_chan = 0;
struct ieee80211_ht_operation *ht_oper = NULL;
ie = get_ie(ies, ies_len, WLAN_EID_HT_OPERATION);
if (ie && ie[1] >= 2) {
ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
sec_chan = 1;
else if (ht_oper->ht_param &
HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
sec_chan = -1;
}
*op_class = get_operating_class(channel, sec_chan);
*phy_type = (sec_chan != 0) ? PHY_TYPE_HT : PHY_TYPE_ERP;
return 0;
}
static int wpas_beacon_rep_add_frame_body(struct bitfield *eids,
enum beacon_report_detail detail,
struct wpa_bss *bss, u8 *buf,
size_t buf_len, u8 **ies_buf,
size_t *ie_len, int add_fixed)
{
u8 *ies = *ies_buf;
size_t ies_len = *ie_len;
u8 *pos = buf;
int rem_len;
rem_len = 255 - sizeof(struct rrm_measurement_beacon_report) -
sizeof(struct rrm_measurement_report_element) - 2 -
REPORTED_FRAME_BODY_SUBELEM_LEN;
if (detail > BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS) {
wpa_printf(MSG_DEBUG,
"Beacon Request: Invalid reporting detail: %d",
detail);
return -1;
}
if (detail == BEACON_REPORT_DETAIL_NONE)
return 0;
/*
* Minimal frame body subelement size: EID(1) + length(1) + TSF(8) +
* beacon interval(2) + capabilities(2) = 14 bytes
*/
if (add_fixed && buf_len < 14)
return -1;
*pos++ = WLAN_BEACON_REPORT_SUBELEM_FRAME_BODY;
/* The length will be filled later */
pos++;
if (add_fixed) {
WPA_PUT_LE64(pos, bss->tsf);
pos += sizeof(bss->tsf);
WPA_PUT_LE16(pos, bss->beacon_int);
pos += 2;
WPA_PUT_LE16(pos, bss->caps);
pos += 2;
}
rem_len -= pos - buf;
/*
* According to IEEE Std 802.11-2016, 9.4.2.22.7, if the reported frame
* body subelement causes the element to exceed the maximum element
* size, the subelement is truncated so that the last IE is a complete
* IE. So even when required to report all IEs, add elements one after
* the other and stop once there is no more room in the measurement
* element.
*/
while (ies_len > 2 && 2U + ies[1] <= ies_len && rem_len > 0) {
if (detail == BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS ||
(eids && bitfield_is_set(eids, ies[0]))) {
u8 elen = ies[1];
if (2 + elen > buf + buf_len - pos ||
2 + elen > rem_len)
break;
*pos++ = ies[0];
*pos++ = elen;
os_memcpy(pos, ies + 2, elen);
pos += elen;
rem_len -= 2 + elen;
}
ies_len -= 2 + ies[1];
ies += 2 + ies[1];
}
*ie_len = ies_len;
*ies_buf = ies;
/* Now the length is known */
buf[1] = pos - buf - 2;
return pos - buf;
}
static int wpas_add_beacon_rep_elem(struct beacon_rep_data *data,
struct wpa_bss *bss,
struct wpabuf **wpa_buf,
struct rrm_measurement_beacon_report *rep,
u8 **ie, size_t *ie_len, u8 idx)
{
int ret;
u8 *buf, *pos;
u32 subelems_len = REPORTED_FRAME_BODY_SUBELEM_LEN +
(data->last_indication ?
BEACON_REPORT_LAST_INDICATION_SUBELEM_LEN : 0);
/* Maximum element length: Beacon Report element + Reported Frame Body
* subelement + all IEs of the reported Beacon frame + Reported Frame
* Body Fragment ID subelement */
buf = os_malloc(sizeof(*rep) + 14 + *ie_len + subelems_len);
if (!buf)
return -1;
os_memcpy(buf, rep, sizeof(*rep));
ret = wpas_beacon_rep_add_frame_body(data->eids, data->report_detail,
bss, buf + sizeof(*rep),
14 + *ie_len, ie, ie_len,
idx == 0);
if (ret < 0)
goto out;
pos = buf + ret + sizeof(*rep);
pos[0] = WLAN_BEACON_REPORT_SUBELEM_FRAME_BODY_FRAGMENT_ID;
pos[1] = 2;
/*
* Only one Beacon Report Measurement is supported at a time, so
* the Beacon Report ID can always be set to 1.
*/
pos[2] = 1;
/* Fragment ID Number (bits 0..6) and More Frame Body Fragments (bit 7)
*/
pos[3] = idx;
if (data->report_detail != BEACON_REPORT_DETAIL_NONE && *ie_len)
pos[3] |= REPORTED_FRAME_BODY_MORE_FRAGMENTS;
else
pos[3] &= ~REPORTED_FRAME_BODY_MORE_FRAGMENTS;
pos += REPORTED_FRAME_BODY_SUBELEM_LEN;
if (data->last_indication) {
pos[0] = WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION;
pos[1] = 1;
/* This field will be updated later if this is the last frame */
pos[2] = 0;
}
ret = wpas_rrm_report_elem(wpa_buf, data->token,
MEASUREMENT_REPORT_MODE_ACCEPT,
MEASURE_TYPE_BEACON, buf,
ret + sizeof(*rep) + subelems_len);
out:
os_free(buf);
return ret;
}
static int wpas_add_beacon_rep(struct wpa_supplicant *wpa_s,
struct wpabuf **wpa_buf, struct wpa_bss *bss,
u64 start, u64 parent_tsf)
{
struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
u8 *ies = (u8 *) (bss + 1);
u8 *pos = ies;
size_t ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
struct rrm_measurement_beacon_report rep;
u8 idx = 0;
if (os_memcmp(data->bssid, broadcast_ether_addr, ETH_ALEN) != 0 &&
os_memcmp(data->bssid, bss->bssid, ETH_ALEN) != 0)
return 0;
if (data->ssid_len &&
(data->ssid_len != bss->ssid_len ||
os_memcmp(data->ssid, bss->ssid, bss->ssid_len) != 0))
return 0;
if (wpas_get_op_chan_phy(bss->channel, ies, ies_len, &rep.op_class,
&rep.channel, &rep.report_info) < 0)
return 0;
rep.channel = bss->channel;
rep.start_time = host_to_le64(start);
rep.duration = host_to_le16(data->scan_params.duration);
rep.rcpi = rssi_to_rcpi(bss->level);
rep.rsni = 255; /* 255 indicates that RSNI is not available */
os_memcpy(rep.bssid, bss->bssid, ETH_ALEN);
rep.antenna_id = 0; /* unknown */
rep.parent_tsf = host_to_le32(parent_tsf);
do {
int ret;
ret = wpas_add_beacon_rep_elem(data, bss, wpa_buf, &rep,
&pos, &ies_len, idx++);
if (ret)
return ret;
} while (data->report_detail != BEACON_REPORT_DETAIL_NONE &&
ies_len >= 2);
return 0;
}
static int wpas_beacon_rep_no_results(struct wpa_supplicant *wpa_s,
struct wpabuf **buf)
{
return wpas_rrm_report_elem(buf, wpa_s->beacon_rep_data.token,
MEASUREMENT_REPORT_MODE_ACCEPT,
MEASURE_TYPE_BEACON, NULL, 0);
}
static void wpas_beacon_rep_table(struct wpa_supplicant *wpa_s,
struct wpabuf **buf)
{
size_t i;
for (i = 0; i < wpa_s->last_scan_res_used; i++) {
if (wpas_add_beacon_rep(wpa_s, buf, wpa_s->last_scan_res[i],
0, 0) < 0)
break;
}
if (!(*buf))
wpas_beacon_rep_no_results(wpa_s, buf);
wpa_hexdump_buf(MSG_DEBUG, "RRM: Radio Measurement report", *buf);
}
static void wpas_rrm_refuse_request(struct wpa_supplicant *wpa_s)
{
if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr)) {
struct wpabuf *buf = NULL;
if (wpas_rrm_report_elem(&buf, wpa_s->beacon_rep_data.token,
MEASUREMENT_REPORT_MODE_REJECT_REFUSED,
MEASURE_TYPE_BEACON, NULL, 0)) {
wpa_printf(MSG_ERROR, "RRM: Memory allocation failed");
wpabuf_free(buf);
return;
}
wpas_rrm_send_msr_report(wpa_s, buf);
wpabuf_free(buf);
}
wpas_clear_beacon_rep_data(wpa_s);
}
static void wpas_rrm_scan_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
struct wpa_driver_scan_params *params =
&wpa_s->beacon_rep_data.scan_params;
u16 prev_duration = params->duration;
if (!wpa_s->current_bss)
return;
os_get_reltime(&wpa_s->beacon_rep_scan);
wpa_s->scan_reason = REASON_RRM_BEACON_REPORT;
if (wpa_supplicant_trigger_scan(wpa_s, params) < 0)
wpas_rrm_refuse_request(wpa_s);
params->duration = prev_duration;
}
static int wpas_rm_handle_beacon_req_subelem(struct wpa_supplicant *wpa_s,
struct beacon_rep_data *data,
u8 sid, u8 slen, const u8 *subelem)
{
u8 report_info, i;
switch (sid) {
case WLAN_BEACON_REQUEST_SUBELEM_SSID:
if (!slen) {
wpa_printf(MSG_DEBUG,
"SSID subelement with zero length - wildcard SSID");
break;
}
if (slen > SSID_MAX_LEN) {
wpa_printf(MSG_DEBUG,
"Invalid SSID subelement length: %u", slen);
return -1;
}
data->ssid_len = slen;
os_memcpy(data->ssid, subelem, data->ssid_len);
break;
case WLAN_BEACON_REQUEST_SUBELEM_INFO:
if (slen != 2) {
wpa_printf(MSG_DEBUG,
"Invalid reporting information subelement length: %u",
slen);
return -1;
}
report_info = subelem[0];
if (report_info != 0) {
wpa_printf(MSG_DEBUG,
"reporting information=%u is not supported",
report_info);
return 0;
}
break;
case WLAN_BEACON_REQUEST_SUBELEM_DETAIL:
if (slen != 1) {
wpa_printf(MSG_DEBUG,
"Invalid reporting detail subelement length: %u",
slen);
return -1;
}
data->report_detail = subelem[0];
if (data->report_detail >
BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS) {
wpa_printf(MSG_DEBUG, "Invalid reporting detail: %u",
subelem[0]);
return -1;
}
break;
case WLAN_BEACON_REQUEST_SUBELEM_REQUEST:
if (data->report_detail !=
BEACON_REPORT_DETAIL_REQUESTED_ONLY) {
wpa_printf(MSG_DEBUG,
"Beacon request: request subelement is present but report detail is %u",
data->report_detail);
return -1;
}
if (!slen) {
wpa_printf(MSG_DEBUG,
"Invalid request subelement length: %u",
slen);
return -1;
}
if (data->eids) {
wpa_printf(MSG_DEBUG,
"Beacon Request: Request subelement appears more than once");
return -1;
}
data->eids = bitfield_alloc(255);
if (!data->eids) {
wpa_printf(MSG_DEBUG, "Failed to allocate EIDs bitmap");
return -1;
}
for (i = 0; i < slen; i++)
bitfield_set(data->eids, subelem[i]);
break;
case WLAN_BEACON_REQUEST_SUBELEM_AP_CHANNEL:
/* Skip - it will be processed when freqs are added */
break;
case WLAN_BEACON_REQUEST_SUBELEM_LAST_INDICATION:
if (slen != 1) {
wpa_printf(MSG_DEBUG,
"Beacon request: Invalid last indication request subelement length: %u",
slen);
return -1;
}
data->last_indication = subelem[0];
break;
default:
wpa_printf(MSG_DEBUG,
"Beacon request: Unknown subelement id %u", sid);
break;
}
return 1;
}
/**
* Returns 0 if the next element can be processed, 1 if some operation was
* triggered, and -1 if processing failed (i.e., the element is in invalid
* format or an internal error occurred).
*/
static int
wpas_rm_handle_beacon_req(struct wpa_supplicant *wpa_s,
u8 elem_token, int duration_mandatory,
const struct rrm_measurement_beacon_request *req,
size_t len, struct wpabuf **buf)
{
struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
struct wpa_driver_scan_params *params = &data->scan_params;
const u8 *subelems;
size_t elems_len;
u16 rand_interval;
u32 interval_usec;
u32 _rand;
int ret = 0, res;
u8 reject_mode;
if (len < sizeof(*req))
return -1;
if (req->mode != BEACON_REPORT_MODE_PASSIVE &&
req->mode != BEACON_REPORT_MODE_ACTIVE &&
req->mode != BEACON_REPORT_MODE_TABLE)
return 0;
subelems = req->variable;
elems_len = len - sizeof(*req);
rand_interval = le_to_host16(req->rand_interval);
os_memset(data, 0, sizeof(*data));
data->token = elem_token;
/* default reporting detail is all fixed length fields and all
* elements */
data->report_detail = BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS;
os_memcpy(data->bssid, req->bssid, ETH_ALEN);
while (elems_len >= 2) {
if (subelems[1] > elems_len - 2) {
wpa_printf(MSG_DEBUG,
"Beacon Request: Truncated subelement");
ret = -1;
goto out;
}
res = wpas_rm_handle_beacon_req_subelem(
wpa_s, data, subelems[0], subelems[1], &subelems[2]);
if (res < 0) {
ret = res;
goto out;
} else if (!res) {
reject_mode = MEASUREMENT_REPORT_MODE_REJECT_INCAPABLE;
goto out_reject;
}
elems_len -= 2 + subelems[1];
subelems += 2 + subelems[1];
}
if (req->mode == BEACON_REPORT_MODE_TABLE) {
wpas_beacon_rep_table(wpa_s, buf);
goto out;
}
params->channel = req->channel;
#ifdef ESP_SUPPLICANT
if (params->channel == 0xff) {
/* set it to zero */
params->channel = 0;
}
#endif
params->duration = le_to_host16(req->duration);
params->duration_mandatory = duration_mandatory;
params->mode = req->mode;
if (!params->duration) {
wpa_printf(MSG_DEBUG, "Beacon request: Duration is 0");
ret = -1;
goto out;
}
if (data->ssid_len) {
params->ssids[params->num_ssids].ssid = data->ssid;
params->ssids[params->num_ssids++].ssid_len = data->ssid_len;
}
if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0)
_rand = os_random();
interval_usec = (_rand % (rand_interval + 1)) * 1024;
os_sleep(0, interval_usec);
wpas_rrm_scan_timeout(wpa_s, NULL);
return 1;
out_reject:
if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr) &&
wpas_rrm_report_elem(buf, elem_token, reject_mode,
MEASURE_TYPE_BEACON, NULL, 0) < 0) {
wpa_printf(MSG_DEBUG, "RRM: Failed to add report element");
ret = -1;
}
out:
wpas_clear_beacon_rep_data(wpa_s);
return ret;
}
static int
wpas_rrm_handle_msr_req_element(
struct wpa_supplicant *wpa_s,
const struct rrm_measurement_request_element *req,
struct wpabuf **buf)
{
int duration_mandatory;
wpa_printf(MSG_DEBUG, "Measurement request type %d token %d",
req->type, req->token);
if (req->mode & MEASUREMENT_REQUEST_MODE_ENABLE) {
/* Enable bit is not supported for now */
wpa_printf(MSG_DEBUG, "RRM: Enable bit not supported, ignore");
return 0;
}
if ((req->mode & MEASUREMENT_REQUEST_MODE_PARALLEL) &&
req->type > MEASURE_TYPE_RPI_HIST) {
/* Parallel measurements are not supported for now */
wpa_printf(MSG_DEBUG,
"RRM: Parallel measurements are not supported, reject");
goto reject;
}
duration_mandatory =
!!(req->mode & MEASUREMENT_REQUEST_MODE_DURATION_MANDATORY);
switch (req->type) {
case MEASURE_TYPE_BEACON:
return wpas_rm_handle_beacon_req(wpa_s, req->token,
duration_mandatory,
(const void *) req->variable,
req->len - 3, buf);
default:
wpa_printf(MSG_INFO,
"RRM: Unsupported radio measurement type %u",
req->type);
break;
}
reject:
if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr) &&
wpas_rrm_report_elem(buf, req->token,
MEASUREMENT_REPORT_MODE_REJECT_INCAPABLE,
req->type, NULL, 0) < 0) {
wpa_printf(MSG_DEBUG, "RRM: Failed to add report element");
return -1;
}
return 0;
}
static struct wpabuf *
wpas_rrm_process_msr_req_elems(struct wpa_supplicant *wpa_s, const u8 *pos,
size_t len)
{
struct wpabuf *buf = NULL;
while (len) {
const struct rrm_measurement_request_element *req;
int res;
if (len < 2) {
wpa_printf(MSG_DEBUG, "RRM: Truncated element");
goto out;
}
req = (const struct rrm_measurement_request_element *) pos;
if (req->eid != WLAN_EID_MEASURE_REQUEST) {
wpa_printf(MSG_DEBUG,
"RRM: Expected Measurement Request element, but EID is %u",
req->eid);
printf("len is %d", len);
goto out;
}
if (req->len < 3) {
wpa_printf(MSG_DEBUG, "RRM: Element length too short");
goto out;
}
if (req->len > len - 2) {
wpa_printf(MSG_DEBUG, "RRM: Element length too long");
goto out;
}
res = wpas_rrm_handle_msr_req_element(wpa_s, req, &buf);
if (res < 0)
goto out;
pos += req->len + 2;
len -= req->len + 2;
}
return buf;
out:
wpabuf_free(buf);
return NULL;
}
void wpas_rrm_handle_radio_measurement_request(struct wpa_supplicant *wpa_s,
const u8 *src, const u8 *dst,
const u8 *frame, size_t len)
{
struct wpabuf *report;
if (!wpa_s->rrm.rrm_used) {
wpa_printf(MSG_INFO,
"RRM: Ignoring radio measurement request: Not RRM network");
return;
}
if (len < 3) {
wpa_printf(MSG_INFO,
"RRM: Ignoring too short radio measurement request");
return;
}
wpa_s->rrm.token = *frame;
os_memcpy(wpa_s->rrm.dst_addr, dst, ETH_ALEN);
/* Number of repetitions is not supported */
report = wpas_rrm_process_msr_req_elems(wpa_s, frame + 3, len - 3);
if (!report)
return;
wpas_rrm_send_msr_report(wpa_s, report);
wpabuf_free(report);
}
void wpas_rrm_handle_link_measurement_request(struct wpa_supplicant *wpa_s,
const u8 *src,
const u8 *frame, size_t len,
int rssi)
{
struct wpabuf *buf;
const struct rrm_link_measurement_request *req;
struct rrm_link_measurement_report report;
req = (const struct rrm_link_measurement_request *) frame;
if (len < sizeof(*req)) {
wpa_printf(MSG_INFO,
"RRM: Link measurement report failed. Request too short");
return;
}
os_memset(&report, 0, sizeof(report));
report.dialog_token = req->dialog_token;
report.tpc.eid = WLAN_EID_TPC_REPORT;
report.tpc.len = 2;
/* Note: The driver is expected to update report.tpc.tx_power and
* report.tpc.link_margin subfields when sending out this frame.
* Similarly, the driver would need to update report.rx_ant_id and
* report.tx_ant_id subfields. */
#ifdef ESP_SUPPLICANT
esp_get_tx_power(&report.tpc.tx_power);
/* Minimum RSSI = -96 dbm */
report.tpc.link_margin = rssi + 96;
#endif
report.rsni = 255; /* 255 indicates that RSNI is not available */
report.rcpi = rssi_to_rcpi(rssi);
/* action_category + action_code */
buf = wpabuf_alloc(2 + sizeof(report));
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"RRM: Link measurement report failed. Buffer allocation failed");
return;
}
wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
wpabuf_put_u8(buf, WLAN_RRM_LINK_MEASUREMENT_REPORT);
wpabuf_put_data(buf, &report, sizeof(report));
wpa_hexdump_buf(MSG_DEBUG, "RRM: Link measurement report", buf);
if (wpa_drv_send_action(wpa_s, 0, 0,
wpabuf_head(buf), wpabuf_len(buf), 0)) {
wpa_printf(MSG_ERROR,
"RRM: Link measurement report failed. Send action failed");
}
wpabuf_free(buf);
}
int wpas_beacon_rep_scan_process(struct wpa_supplicant *wpa_s,
u64 scan_start_tsf)
{
size_t i = 0;
struct wpabuf *buf = NULL;
struct wpa_bss *bss = NULL;
if (!wpa_s->beacon_rep_data.token)
return 0;
if (!wpa_s->current_bss)
goto out;
wpa_printf(MSG_DEBUG, "RRM: TSF current BSS: " MACSTR,
MAC2STR(wpa_s->current_bss->bssid));
for (i = 0; i < wpa_s->num_bss; i++) {
bss = wpa_bss_get_next_bss(wpa_s, bss);
if (!bss)
continue;
if (wpa_s->beacon_rep_data.scan_params.channel &&
bss->channel != wpa_s->beacon_rep_data.scan_params.channel)
continue;
/* We flush scan results before issuing scan again */
#ifndef ESP_SUPPLICANT
/*
* Don't report results that were not received during the
* current measurement.
*/
if (scan_start_tsf <
scan_res->res[i]->parent_tsf) {
struct os_reltime update_time, diff;
/* For now, allow 7 ms older results due to some
* unknown issue with cfg80211 BSS table updates during
* a scan with the current BSS.
* TODO: Fix this more properly to avoid having to have
* this type of hacks in place. */
calculate_update_time(&scan_res->fetch_time,
scan_res->res[i]->age,
&update_time);
os_reltime_sub(&wpa_s->beacon_rep_scan,
&update_time, &diff);
if (os_reltime_before(&update_time,
&wpa_s->beacon_rep_scan) &&
(diff.sec || diff.usec >= 8000)) {
wpa_printf(MSG_ERROR,
"RRM: Ignore scan result for " MACSTR
" due to old update (age(ms) %u, calculated age %u.%06u seconds)",
MAC2STR(scan_res->res[i]->bssid),
scan_res->res[i]->age,
(unsigned int) diff.sec,
(unsigned int) diff.usec);
continue;
}
} else {
continue;
}
#endif
if (wpas_add_beacon_rep(wpa_s, &buf, bss, scan_start_tsf,
bss->parent_tsf) < 0)
break;
}
if (!buf && wpas_beacon_rep_no_results(wpa_s, &buf))
goto out;
wpa_hexdump_buf(MSG_DEBUG, "RRM: Radio Measurement report", buf);
wpas_rrm_send_msr_report(wpa_s, buf);
wpabuf_free(buf);
out:
wpas_clear_beacon_rep_data(wpa_s);
return 1;
}
void wpas_clear_beacon_rep_data(struct wpa_supplicant *wpa_s)
{
struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
eloop_cancel_timeout(wpas_rrm_scan_timeout, wpa_s, NULL);
bitfield_free(data->eids);
os_memset(data, 0, sizeof(*data));
}
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