/*
* 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 "includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_common.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "bss.h"
#include "scan.h"
#include "p2p_supplicant.h"
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);
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)
{
struct wpabuf *neighbor_rep;
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_printf(MSG_ERROR, "RRM: Unexpected neighbor report");
return;
}
/* skipping the first byte, which is only an id (dialog token) */
neighbor_rep = wpabuf_alloc(report_len - 1);
if (!neighbor_rep) {
wpas_rrm_neighbor_rep_timeout_handler(&wpa_s->rrm, NULL);
return;
}
wpabuf_put_data(neighbor_rep, report + 1, report_len - 1);
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,
neighbor_rep);
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 */
#define ENOTCONN -1
#define EOPNOTSUPP -1
#define ECANCELED -1
#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,
struct wpabuf *neighbor_rep),
void *cb_ctx)
{
struct wpabuf *buf;
const u8 *rrm_ie;
if (wpa_s->wpa_state != WPA_COMPLETED || wpa_s->current_ssid == NULL) {
wpa_printf(MSG_DEBUG, "RRM: No connection, no RRM.");
return -ENOTCONN;
}
if (!wpa_s->rrm.rrm_used) {
wpa_printf(MSG_DEBUG, "RRM: No RRM in current connection.");
return -EOPNOTSUPP;
}
rrm_ie = wpa_bss_get_ie(wpa_s->current_bss,
WLAN_EID_RRM_ENABLED_CAPABILITIES);
if (!rrm_ie || !(wpa_s->current_bss->caps & IEEE80211_CAP_RRM) ||
!(rrm_ie[2] & WLAN_RRM_CAPS_NEIGHBOR_REPORT)) {
wpa_printf(MSG_DEBUG,
"RRM: No network support for Neighbor Report.");
return -EOPNOTSUPP;
}
/* Refuse if there's a live request */
if (wpa_s->rrm.notify_neighbor_rep) {
wpa_printf(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_printf(MSG_DEBUG,
"RRM: Failed to allocate Neighbor Report Request");
return -ENOMEM;
}
wpa_printf(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, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
wpa_printf(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 int
wpas_rrm_build_lci_report(struct wpa_supplicant *wpa_s,
const struct rrm_measurement_request_element *req,
struct wpabuf **buf)
{
u8 subject;
u16 max_age = 0;
struct os_reltime t, diff;
unsigned long diff_l;
const u8 *subelem;
const u8 *request = req->variable;
size_t len = req->len - 3;
if (len < 1)
return -1;
if (!wpa_s->lci)
goto reject;
subject = *request++;
len--;
wpa_printf(MSG_DEBUG, "Measurement request location subject=%u",
subject);
if (subject != LOCATION_SUBJECT_REMOTE) {
wpa_printf(MSG_INFO,
"Not building LCI report - bad location subject");
return 0;
}
/* Subelements are formatted exactly like elements */
wpa_hexdump(MSG_DEBUG, "LCI request subelements", request, len);
subelem = get_ie(request, len, LCI_REQ_SUBELEM_MAX_AGE);
if (subelem && subelem[1] == 2)
max_age = WPA_GET_LE16(subelem + 2);
if (os_get_reltime(&t))
goto reject;
os_reltime_sub(&t, &wpa_s->lci_time, &diff);
/* LCI age is calculated in 10th of a second units. */
diff_l = diff.sec * 10 + diff.usec / 100000;
if (max_age != 0xffff && max_age < diff_l)
goto reject;
if (wpas_rrm_report_elem(buf, req->token,
MEASUREMENT_REPORT_MODE_ACCEPT, req->type,
wpabuf_head_u8(wpa_s->lci),
wpabuf_len(wpa_s->lci)) < 0) {
wpa_printf(MSG_DEBUG, "Failed to add LCI report element");
return -1;
}
return 0;
reject:
if (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 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, wpa_s->assoc_freq, 0, wpa_s->bssid,
wpa_s->own_addr, wpa_s->bssid,
wpabuf_head(report), wpabuf_len(report), 0)) {
wpa_printf(MSG_ERROR,
"RRM: Radio measurement report failed: Sending Action frame failed");
}
wpabuf_free(report);
}
static void wpas_rrm_send_msr_report(struct wpa_supplicant *wpa_s,
struct wpabuf *buf)
{
int len = wpabuf_len(buf);
const u8 *pos = wpabuf_head_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 ||
(send_len + next[1] + 2) > MPDU_REPORT_LEN) {
wpas_rrm_send_msr_report_mpdu(wpa_s, pos, send_len);
len -= send_len;
pos = next;
}
next += next[1] + 2;
}
#undef MPDU_REPORT_LEN
}
static int wpas_add_channel(u8 op_class, u8 chan, u8 num_primary_channels,
int *freqs)
{
size_t i;
for (i = 0; i < num_primary_channels; i++) {
u8 primary_chan = chan - (2 * num_primary_channels - 2) + i * 4;
freqs[i] = ieee80211_chan_to_freq(NULL, op_class, primary_chan);
/* ieee80211_chan_to_freq() is not really meant for this
* conversion of 20 MHz primary channel numbers for wider VHT
* channels, so handle those as special cases here for now. */
if (freqs[i] < 0 &&
(op_class == 128 || op_class == 129 || op_class == 130))
freqs[i] = 5000 + 5 * primary_chan;
if (freqs[i] < 0) {
wpa_printf(MSG_DEBUG,
"Beacon Report: Invalid channel %u",
chan);
return -1;
}
}
return 0;
}
static int * wpas_add_channels(const struct oper_class_map *op,
struct hostapd_hw_modes *mode, int active,
const u8 *channels, const u8 size)
{
int *freqs, *next_freq;
u8 num_primary_channels, i;
u8 num_chans;
num_chans = channels ? size :
(op->max_chan - op->min_chan) / op->inc + 1;
if (op->bw == BW80 || op->bw == BW80P80)
num_primary_channels = 4;
else if (op->bw == BW160)
num_primary_channels = 8;
else
num_primary_channels = 1;
/* one extra place for the zero-terminator */
freqs = os_calloc(num_chans * num_primary_channels + 1, sizeof(*freqs));
if (!freqs) {
wpa_printf(MSG_ERROR,
"Beacon Report: Failed to allocate freqs array");
return NULL;
}
next_freq = freqs;
for (i = 0; i < num_chans; i++) {
u8 chan = channels ? channels[i] : op->min_chan + i * op->inc;
enum chan_allowed res = verify_channel(mode, chan, op->bw);
if (res == NOT_ALLOWED || (res == NO_IR && active))
continue;
if (wpas_add_channel(op->op_class, chan, num_primary_channels,
next_freq) < 0) {
os_free(freqs);
return NULL;
}
next_freq += num_primary_channels;
}
if (!freqs[0]) {
os_free(freqs);
return NULL;
}
return freqs;
}
static int * wpas_op_class_freqs(const struct oper_class_map *op,
struct hostapd_hw_modes *mode, int active)
{
u8 channels_80mhz[] = { 42, 58, 106, 122, 138, 155 };
u8 channels_160mhz[] = { 50, 114 };
/*
* When adding all channels in the operating class, 80 + 80 MHz
* operating classes are like 80 MHz channels because we add all valid
* channels anyway.
*/
if (op->bw == BW80 || op->bw == BW80P80)
return wpas_add_channels(op, mode, active, channels_80mhz,
ARRAY_SIZE(channels_80mhz));
if (op->bw == BW160)
return wpas_add_channels(op, mode, active, channels_160mhz,
ARRAY_SIZE(channels_160mhz));
return wpas_add_channels(op, mode, active, NULL, 0);
}
static int * wpas_channel_report_freqs(struct wpa_supplicant *wpa_s, int active,
const char *country, const u8 *subelems,
size_t len)
{
int *freqs = NULL, *new_freqs;
const u8 *end = subelems + len;
while (end - subelems > 2) {
const struct oper_class_map *op;
const u8 *ap_chan_elem, *pos;
u8 left;
struct hostapd_hw_modes *mode;
ap_chan_elem = get_ie(subelems, end - subelems,
WLAN_BEACON_REQUEST_SUBELEM_AP_CHANNEL);
if (!ap_chan_elem)
break;
pos = ap_chan_elem + 2;
left = ap_chan_elem[1];
if (left < 1)
break;
subelems = ap_chan_elem + 2 + left;
op = get_oper_class(country, *pos);
if (!op) {
wpa_printf(MSG_DEBUG,
"Beacon request: unknown operating class in AP Channel Report subelement %u",
*pos);
goto out;
}
pos++;
left--;
mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op->mode);
if (!mode)
continue;
/*
* For 80 + 80 MHz operating classes, this AP Channel Report
* element should be followed by another element specifying
* the second 80 MHz channel. For now just add this 80 MHz
* channel, the second 80 MHz channel will be added when the
* next element is parsed.
* TODO: Verify that this AP Channel Report element is followed
* by a corresponding AP Channel Report element as specified in
* IEEE Std 802.11-2016, 11.11.9.1.
*/
new_freqs = wpas_add_channels(op, mode, active, pos, left);
if (new_freqs)
int_array_concat(&freqs, new_freqs);
os_free(new_freqs);
}
return freqs;
out:
os_free(freqs);
return NULL;
}
static int * wpas_beacon_request_freqs(struct wpa_supplicant *wpa_s,
u8 op_class, u8 chan, int active,
const u8 *subelems, size_t len)
{
int *freqs = NULL, *ext_freqs = NULL;
struct hostapd_hw_modes *mode;
const char *country = NULL;
const struct oper_class_map *op;
const u8 *elem;
if (!wpa_s->current_bss)
return NULL;
elem = wpa_bss_get_ie(wpa_s->current_bss, WLAN_EID_COUNTRY);
if (elem && elem[1] >= 2)
country = (const char *) (elem + 2);
op = get_oper_class(country, op_class);
if (!op) {
wpa_printf(MSG_DEBUG,
"Beacon request: invalid operating class %d",
op_class);
return NULL;
}
mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op->mode);
if (!mode)
return NULL;
switch (chan) {
case 0:
freqs = wpas_op_class_freqs(op, mode, active);
if (!freqs)
return NULL;
break;
case 255:
/* freqs will be added from AP channel subelements */
break;
default:
freqs = wpas_add_channels(op, mode, active, &chan, 1);
if (!freqs)
return NULL;
break;
}
ext_freqs = wpas_channel_report_freqs(wpa_s, active, country, subelems,
len);
if (ext_freqs) {
int_array_concat(&freqs, ext_freqs);
os_free(ext_freqs);
}
return freqs;
}
static int wpas_get_op_chan_phy(int freq, const u8 *ies, size_t ies_len,
u8 *op_class, u8 *chan, u8 *phy_type)
{
const u8 *ie;
int sec_chan = 0, vht = 0;
struct ieee80211_ht_operation *ht_oper = NULL;
struct ieee80211_vht_operation *vht_oper = NULL;
u8 seg0, seg1;
ie = get_ie(ies, ies_len, WLAN_EID_HT_OPERATION);
if (ie && ie[1] >= sizeof(struct ieee80211_ht_operation)) {
u8 sec_chan_offset;
ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
sec_chan_offset = ht_oper->ht_param &
HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
if (sec_chan_offset == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
sec_chan = 1;
else if (sec_chan_offset ==
HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
sec_chan = -1;
}
ie = get_ie(ies, ies_len, WLAN_EID_VHT_OPERATION);
if (ie && ie[1] >= sizeof(struct ieee80211_vht_operation)) {
vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
switch (vht_oper->vht_op_info_chwidth) {
case 1:
seg0 = vht_oper->vht_op_info_chan_center_freq_seg0_idx;
seg1 = vht_oper->vht_op_info_chan_center_freq_seg1_idx;
if (seg1 && abs(seg1 - seg0) == 8)
vht = VHT_CHANWIDTH_160MHZ;
else if (seg1)
vht = VHT_CHANWIDTH_80P80MHZ;
else
vht = VHT_CHANWIDTH_80MHZ;
break;
case 2:
vht = VHT_CHANWIDTH_160MHZ;
break;
case 3:
vht = VHT_CHANWIDTH_80P80MHZ;
break;
default:
vht = VHT_CHANWIDTH_USE_HT;
break;
}
}
if (ieee80211_freq_to_channel_ext(freq, sec_chan, vht, op_class,
chan) == NUM_HOSTAPD_MODES) {
wpa_printf(MSG_DEBUG,
"Cannot determine operating class and channel");
return -1;
}
*phy_type = ieee80211_get_phy_type(freq, ht_oper != NULL,
vht_oper != NULL);
if (*phy_type == PHY_TYPE_UNSPECIFIED) {
wpa_printf(MSG_DEBUG, "Cannot determine phy type");
return -1;
}
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 = (u8 *) (bss + 1);
size_t ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
u8 *pos = buf;
int rem_len;
rem_len = 255 - sizeof(struct rrm_measurement_beacon_report) -
sizeof(struct rrm_measurement_report_element) - 2;
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 (buf_len < 14)
return 0;
*pos++ = WLAN_BEACON_REPORT_SUBELEM_FRAME_BODY;
/* The length will be filled later */
pos++;
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 eid = ies[0], elen = ies[1];
if ((eid == WLAN_EID_TIM || eid == WLAN_EID_RSN) &&
elen > 4)
elen = 4;
/*
* TODO: Truncate IBSS DFS element as described in
* IEEE Std 802.11-2016, 9.4.2.22.7.
*/
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];
}
/* Now the length is known */
buf[1] = pos - buf - 2;
return pos - buf;
}
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 *ie = (u8 *) (bss + 1);
size_t ie_len = bss->ie_len + bss->beacon_ie_len;
int ret;
u8 buf[2000];
struct rrm_measurement_beacon_report *rep;
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;
rep = (struct rrm_measurement_beacon_report *) buf;
if (wpas_get_op_chan_phy(bss->freq, ie, ie_len, &rep->op_class,
&rep->channel, &rep->report_info) < 0)
return 0;
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);
ret = wpas_beacon_rep_add_frame_body(data->eids, data->report_detail,
bss, rep->variable,
sizeof(buf) - sizeof(*rep));
if (ret < 0)
return -1;
return wpas_rrm_report_elem(wpa_buf, wpa_s->beacon_rep_data.token,
MEASUREMENT_REPORT_MODE_ACCEPT,
MEASURE_TYPE_BEACON, buf,
ret + sizeof(*rep));
}
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)
{
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);
wpas_clear_beacon_rep_data(wpa_s);
wpabuf_free(buf);
}
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;
if (!(wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_SUPPORT_SET_SCAN_DWELL) &&
params->duration) {
wpa_printf(MSG_DEBUG,
"RRM: Cannot set scan duration due to missing driver support");
params->duration = 0;
}
os_get_reltime(&wpa_s->beacon_rep_scan);
if (wpa_s->scanning || wpas_p2p_in_progress(wpa_s) ||
wpa_supplicant_trigger_scan(wpa_s, params))
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 0;
}
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;
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;
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_free(params->freqs);
os_memset(params, 0, sizeof(*params));
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 != 1) {
ret = res;
goto out;
}
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->freqs = wpas_beacon_request_freqs(
wpa_s, req->oper_class, req->channel,
req->mode == BEACON_REPORT_MODE_ACTIVE,
req->variable, len - sizeof(*req));
if (!params->freqs) {
wpa_printf(MSG_DEBUG, "Beacon request: No valid channels");
goto out;
}
params->duration = le_to_host16(req->duration);
params->duration_mandatory = duration_mandatory;
if (!params->duration) {
wpa_printf(MSG_DEBUG, "Beacon request: Duration is 0");
ret = -1;
goto out;
}
params->only_new_results = 1;
if (req->mode == BEACON_REPORT_MODE_ACTIVE) {
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;
eloop_register_timeout(0, interval_usec, wpas_rrm_scan_timeout, wpa_s,
NULL);
return 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_LCI:
return wpas_rrm_build_lci_report(wpa_s, req, buf);
case MEASURE_TYPE_BEACON:
if (duration_mandatory &&
!(wpa_s->drv_rrm_flags &
WPA_DRIVER_FLAGS_SUPPORT_SET_SCAN_DWELL)) {
wpa_printf(MSG_DEBUG,
"RRM: Driver does not support dwell time configuration - reject beacon report with mandatory duration");
goto reject;
}
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 (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);
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 *frame, size_t len)
{
struct wpabuf *report;
if (wpa_s->wpa_state != WPA_COMPLETED) {
wpa_printf(MSG_INFO,
"RRM: Ignoring radio measurement request: Not associated");
return;
}
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;
/* 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;
if (wpa_s->wpa_state != WPA_COMPLETED) {
wpa_printf(MSG_INFO,
"RRM: Ignoring link measurement request. Not associated");
return;
}
if (!wpa_s->rrm.rrm_used) {
wpa_printf(MSG_INFO,
"RRM: Ignoring link measurement request. Not RRM network");
return;
}
if (!(wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_TX_POWER_INSERTION)) {
wpa_printf(MSG_INFO,
"RRM: Measurement report failed. TX power insertion not supported");
return;
}
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. */
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, wpa_s->assoc_freq, 0, src,
wpa_s->own_addr, wpa_s->bssid,
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,
struct wpa_scan_results *scan_res,
struct scan_info *info)
{
size_t i = 0;
struct wpabuf *buf = NULL;
if (!wpa_s->beacon_rep_data.token)
return 0;
if (!wpa_s->current_bss)
goto out;
/* If the measurement was aborted, don't report partial results */
if (info->aborted)
goto out;
wpa_printf(MSG_DEBUG, "RRM: TSF BSSID: " MACSTR " current BSS: " MACSTR,
MAC2STR(info->scan_start_tsf_bssid),
MAC2STR(wpa_s->current_bss->bssid));
if ((wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT) &&
os_memcmp(info->scan_start_tsf_bssid, wpa_s->current_bss->bssid,
ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG,
"RRM: Ignore scan results due to mismatching TSF BSSID");
goto out;
}
for (i = 0; i < scan_res->num; i++) {
struct wpa_bss *bss =
wpa_bss_get_bssid(wpa_s, scan_res->res[i]->bssid);
if (!bss)
continue;
if ((wpa_s->drv_rrm_flags &
WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT) &&
os_memcmp(scan_res->res[i]->tsf_bssid,
wpa_s->current_bss->bssid, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG,
"RRM: Ignore scan result for " MACSTR
" due to mismatching TSF BSSID" MACSTR,
MAC2STR(scan_res->res[i]->bssid),
MAC2STR(scan_res->res[i]->tsf_bssid));
continue;
}
if (!(wpa_s->drv_rrm_flags &
WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT)) {
struct os_reltime update_time, diff;
/* For now, allow 8 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_DEBUG,
"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;
}
}
/*
* Don't report results that were not received during the
* current measurement.
*/
if (info->scan_start_tsf > scan_res->res[i]->parent_tsf)
continue;
if (wpas_add_beacon_rep(wpa_s, &buf, bss, info->scan_start_tsf,
scan_res->res[i]->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_free(data->scan_params.freqs);
os_memset(data, 0, sizeof(*data));
}