/* * wpa_supplicant - Radio Measurements * Copyright (c) 2003-2016, Jouni Malinen * * 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 #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)); }