2 * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
3 * Copyright (c) 2002-2004, Instant802 Networks, Inc.
4 * Copyright (c) 2005-2006, Devicescape Software, Inc.
5 * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
7 * This software may be distributed under the terms of the BSD license.
8 * See README for more details.
11 #include "utils/includes.h"
13 #ifndef CONFIG_NATIVE_WINDOWS
15 #include "utils/common.h"
16 #include "common/ieee802_11_defs.h"
17 #include "common/ieee802_11_common.h"
18 #include "common/hw_features_common.h"
19 #include "wps/wps_defs.h"
22 #include "ieee802_11.h"
25 #include "ap_config.h"
27 #include "p2p_hostapd.h"
28 #include "ap_drv_ops.h"
36 static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid,
39 if (!hapd->conf->radio_measurements || len < 2 + 4)
42 *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES;
44 *eid++ = (hapd->conf->radio_measurements & BIT(0)) ?
45 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00;
54 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
59 #ifdef CONFIG_TESTING_OPTIONS
60 if (hapd->conf->bss_load_test_set) {
61 *eid++ = WLAN_EID_BSS_LOAD;
63 os_memcpy(eid, hapd->conf->bss_load_test, 5);
67 #endif /* CONFIG_TESTING_OPTIONS */
68 if (hapd->conf->bss_load_update_period) {
69 *eid++ = WLAN_EID_BSS_LOAD;
71 WPA_PUT_LE16(eid, hapd->num_sta);
73 *eid++ = hapd->iface->channel_utilization;
74 WPA_PUT_LE16(eid, 0); /* no available admission capabity */
81 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
85 if (hapd->iface->current_mode == NULL ||
86 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
89 if (hapd->iface->olbc)
90 erp |= ERP_INFO_USE_PROTECTION;
91 if (hapd->iface->num_sta_non_erp > 0) {
92 erp |= ERP_INFO_NON_ERP_PRESENT |
93 ERP_INFO_USE_PROTECTION;
95 if (hapd->iface->num_sta_no_short_preamble > 0 ||
96 hapd->iconf->preamble == LONG_PREAMBLE)
97 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
103 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
105 *eid++ = WLAN_EID_DS_PARAMS;
107 *eid++ = hapd->iconf->channel;
112 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
114 if (hapd->iface->current_mode == NULL ||
115 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
118 /* Set NonERP_present and use_protection bits if there
119 * are any associated NonERP stations. */
120 /* TODO: use_protection bit can be set to zero even if
121 * there are NonERP stations present. This optimization
122 * might be useful if NonERP stations are "quiet".
123 * See 802.11g/D6 E-1 for recommended practice.
124 * In addition, Non ERP present might be set, if AP detects Non ERP
125 * operation on other APs. */
127 /* Add ERP Information element */
128 *eid++ = WLAN_EID_ERP_INFO;
130 *eid++ = ieee802_11_erp_info(hapd);
136 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
139 u8 local_pwr_constraint = 0;
142 if (hapd->iface->current_mode == NULL ||
143 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
146 /* Let host drivers add this IE if DFS support is offloaded */
147 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
151 * There is no DFS support and power constraint was not directly
152 * requested by config option.
154 if (!hapd->iconf->ieee80211h &&
155 hapd->iconf->local_pwr_constraint == -1)
158 /* Check if DFS is required by regulatory. */
159 dfs = hostapd_is_dfs_required(hapd->iface);
161 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
166 if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
170 * ieee80211h (DFS) is enabled so Power Constraint element shall
171 * be added when running on DFS channel whenever local_pwr_constraint
172 * is configured or not. In order to meet regulations when TPC is not
173 * implemented using a transmit power that is below the legal maximum
174 * (including any mitigation factor) should help. In this case,
175 * indicate 3 dB below maximum allowed transmit power.
177 if (hapd->iconf->local_pwr_constraint == -1)
178 local_pwr_constraint = 3;
181 * A STA that is not an AP shall use a transmit power less than or
182 * equal to the local maximum transmit power level for the channel.
183 * The local maximum transmit power can be calculated from the formula:
184 * local max TX pwr = max TX pwr - local pwr constraint
185 * Where max TX pwr is maximum transmit power level specified for
186 * channel in Country element and local pwr constraint is specified
187 * for channel in this Power Constraint element.
191 *pos++ = WLAN_EID_PWR_CONSTRAINT;
194 /* Local Power Constraint */
195 if (local_pwr_constraint)
196 *pos++ = local_pwr_constraint;
198 *pos++ = hapd->iconf->local_pwr_constraint;
204 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
205 struct hostapd_channel_data *start,
206 struct hostapd_channel_data *prev)
211 /* first channel number */
212 *pos++ = start->chan;
213 /* number of channels */
214 *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
215 /* maximum transmit power level */
216 *pos++ = start->max_tx_power;
222 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
226 u8 *end = eid + max_len;
228 struct hostapd_hw_modes *mode;
229 struct hostapd_channel_data *start, *prev;
230 int chan_spacing = 1;
232 if (!hapd->iconf->ieee80211d || max_len < 6 ||
233 hapd->iface->current_mode == NULL)
236 *pos++ = WLAN_EID_COUNTRY;
237 pos++; /* length will be set later */
238 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
241 mode = hapd->iface->current_mode;
242 if (mode->mode == HOSTAPD_MODE_IEEE80211A)
246 for (i = 0; i < mode->num_channels; i++) {
247 struct hostapd_channel_data *chan = &mode->channels[i];
248 if (chan->flag & HOSTAPD_CHAN_DISABLED)
251 prev->chan + chan_spacing == chan->chan &&
252 start->max_tx_power == chan->max_tx_power) {
254 continue; /* can use same entry */
258 pos = hostapd_eid_country_add(pos, end, chan_spacing,
263 /* Start new group */
268 pos = hostapd_eid_country_add(pos, end, chan_spacing,
272 if ((pos - eid) & 1) {
275 *pos++ = 0; /* pad for 16-bit alignment */
278 eid[1] = (pos - eid) - 2;
284 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
289 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
290 if (ie == NULL || ielen > len)
293 os_memcpy(eid, ie, ielen);
298 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
300 #ifdef CONFIG_TESTING_OPTIONS
301 if (hapd->iface->cs_oper_class && hapd->iconf->ecsa_ie_only)
303 #endif /* CONFIG_TESTING_OPTIONS */
305 if (!hapd->cs_freq_params.channel)
308 *eid++ = WLAN_EID_CHANNEL_SWITCH;
310 *eid++ = hapd->cs_block_tx;
311 *eid++ = hapd->cs_freq_params.channel;
312 *eid++ = hapd->cs_count;
318 static u8 * hostapd_eid_ecsa(struct hostapd_data *hapd, u8 *eid)
320 if (!hapd->cs_freq_params.channel || !hapd->iface->cs_oper_class)
323 *eid++ = WLAN_EID_EXT_CHANSWITCH_ANN;
325 *eid++ = hapd->cs_block_tx;
326 *eid++ = hapd->iface->cs_oper_class;
327 *eid++ = hapd->cs_freq_params.channel;
328 *eid++ = hapd->cs_count;
334 static u8 * hostapd_eid_supported_op_classes(struct hostapd_data *hapd, u8 *eid)
336 u8 op_class, channel;
338 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_CSA) ||
342 if (ieee80211_freq_to_channel_ext(hapd->iface->freq,
343 hapd->iconf->secondary_channel,
344 hapd->iconf->vht_oper_chwidth,
345 &op_class, &channel) ==
349 *eid++ = WLAN_EID_SUPPORTED_OPERATING_CLASSES;
352 /* Current Operating Class */
355 /* TODO: Advertise all the supported operating classes */
362 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
363 const struct ieee80211_mgmt *req,
364 int is_p2p, size_t *resp_len)
366 struct ieee80211_mgmt *resp;
367 u8 *pos, *epos, *csa_pos;
370 #define MAX_PROBERESP_LEN 768
371 buflen = MAX_PROBERESP_LEN;
373 if (hapd->wps_probe_resp_ie)
374 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
375 #endif /* CONFIG_WPS */
377 if (hapd->p2p_probe_resp_ie)
378 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
379 #endif /* CONFIG_P2P */
381 if (hapd->iface->fst_ies)
382 buflen += wpabuf_len(hapd->iface->fst_ies);
383 #endif /* CONFIG_FST */
384 if (hapd->conf->vendor_elements)
385 buflen += wpabuf_len(hapd->conf->vendor_elements);
386 if (hapd->conf->vendor_vht) {
387 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
388 2 + sizeof(struct ieee80211_vht_operation);
390 resp = os_zalloc(buflen);
394 epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
396 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
397 WLAN_FC_STYPE_PROBE_RESP);
399 os_memcpy(resp->da, req->sa, ETH_ALEN);
400 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
402 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
403 resp->u.probe_resp.beacon_int =
404 host_to_le16(hapd->iconf->beacon_int);
406 /* hardware or low-level driver will setup seq_ctrl and timestamp */
407 resp->u.probe_resp.capab_info =
408 host_to_le16(hostapd_own_capab_info(hapd));
410 pos = resp->u.probe_resp.variable;
411 *pos++ = WLAN_EID_SSID;
412 *pos++ = hapd->conf->ssid.ssid_len;
413 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
414 pos += hapd->conf->ssid.ssid_len;
416 /* Supported rates */
417 pos = hostapd_eid_supp_rates(hapd, pos);
420 pos = hostapd_eid_ds_params(hapd, pos);
422 pos = hostapd_eid_country(hapd, pos, epos - pos);
424 /* Power Constraint element */
425 pos = hostapd_eid_pwr_constraint(hapd, pos);
428 csa_pos = hostapd_eid_csa(hapd, pos);
430 hapd->cs_c_off_proberesp = csa_pos - (u8 *) resp - 1;
433 /* ERP Information element */
434 pos = hostapd_eid_erp_info(hapd, pos);
436 /* Extended supported rates */
437 pos = hostapd_eid_ext_supp_rates(hapd, pos);
440 pos = hostapd_eid_wpa(hapd, pos, epos - pos);
442 pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
444 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
447 csa_pos = hostapd_eid_ecsa(hapd, pos);
449 hapd->cs_c_off_ecsa_proberesp = csa_pos - (u8 *) resp - 1;
452 pos = hostapd_eid_supported_op_classes(hapd, pos);
454 #ifdef CONFIG_IEEE80211N
455 /* Secondary Channel Offset element */
456 /* TODO: The standard doesn't specify a position for this element. */
457 pos = hostapd_eid_secondary_channel(hapd, pos);
459 pos = hostapd_eid_ht_capabilities(hapd, pos);
460 pos = hostapd_eid_ht_operation(hapd, pos);
461 #endif /* CONFIG_IEEE80211N */
463 pos = hostapd_eid_ext_capab(hapd, pos);
465 pos = hostapd_eid_time_adv(hapd, pos);
466 pos = hostapd_eid_time_zone(hapd, pos);
468 pos = hostapd_eid_interworking(hapd, pos);
469 pos = hostapd_eid_adv_proto(hapd, pos);
470 pos = hostapd_eid_roaming_consortium(hapd, pos);
473 if (hapd->iface->fst_ies) {
474 os_memcpy(pos, wpabuf_head(hapd->iface->fst_ies),
475 wpabuf_len(hapd->iface->fst_ies));
476 pos += wpabuf_len(hapd->iface->fst_ies);
478 #endif /* CONFIG_FST */
480 #ifdef CONFIG_IEEE80211AC
481 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
482 pos = hostapd_eid_vht_capabilities(hapd, pos);
483 pos = hostapd_eid_vht_operation(hapd, pos);
484 pos = hostapd_eid_txpower_envelope(hapd, pos);
485 pos = hostapd_eid_wb_chsw_wrapper(hapd, pos);
487 if (hapd->conf->vendor_vht)
488 pos = hostapd_eid_vendor_vht(hapd, pos);
489 #endif /* CONFIG_IEEE80211AC */
491 /* Wi-Fi Alliance WMM */
492 pos = hostapd_eid_wmm(hapd, pos);
495 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
496 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
497 wpabuf_len(hapd->wps_probe_resp_ie));
498 pos += wpabuf_len(hapd->wps_probe_resp_ie);
500 #endif /* CONFIG_WPS */
503 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
504 hapd->p2p_probe_resp_ie) {
505 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
506 wpabuf_len(hapd->p2p_probe_resp_ie));
507 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
509 #endif /* CONFIG_P2P */
510 #ifdef CONFIG_P2P_MANAGER
511 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
513 pos = hostapd_eid_p2p_manage(hapd, pos);
514 #endif /* CONFIG_P2P_MANAGER */
517 pos = hostapd_eid_hs20_indication(hapd, pos);
518 pos = hostapd_eid_osen(hapd, pos);
519 #endif /* CONFIG_HS20 */
521 if (hapd->conf->vendor_elements) {
522 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
523 wpabuf_len(hapd->conf->vendor_elements));
524 pos += wpabuf_len(hapd->conf->vendor_elements);
527 *resp_len = pos - (u8 *) resp;
532 enum ssid_match_result {
538 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
539 const u8 *ssid, size_t ssid_len,
541 size_t ssid_list_len)
548 if (ssid_len == hapd->conf->ssid.ssid_len &&
549 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
550 return EXACT_SSID_MATCH;
552 if (ssid_list == NULL)
553 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
556 end = ssid_list + ssid_list_len;
557 while (end - pos >= 1) {
558 if (2 + pos[1] > end - pos)
562 if (pos[1] == hapd->conf->ssid.ssid_len &&
563 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
564 return EXACT_SSID_MATCH;
568 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
572 void sta_track_expire(struct hostapd_iface *iface, int force)
574 struct os_reltime now;
575 struct hostapd_sta_info *info;
577 if (!iface->num_sta_seen)
580 os_get_reltime(&now);
581 while ((info = dl_list_first(&iface->sta_seen, struct hostapd_sta_info,
584 !os_reltime_expired(&now, &info->last_seen,
585 iface->conf->track_sta_max_age))
589 wpa_printf(MSG_MSGDUMP, "%s: Expire STA tracking entry for "
590 MACSTR, iface->bss[0]->conf->iface,
591 MAC2STR(info->addr));
592 dl_list_del(&info->list);
593 iface->num_sta_seen--;
599 static struct hostapd_sta_info * sta_track_get(struct hostapd_iface *iface,
602 struct hostapd_sta_info *info;
604 dl_list_for_each(info, &iface->sta_seen, struct hostapd_sta_info, list)
605 if (os_memcmp(addr, info->addr, ETH_ALEN) == 0)
612 void sta_track_add(struct hostapd_iface *iface, const u8 *addr)
614 struct hostapd_sta_info *info;
616 info = sta_track_get(iface, addr);
618 /* Move the most recent entry to the end of the list */
619 dl_list_del(&info->list);
620 dl_list_add_tail(&iface->sta_seen, &info->list);
621 os_get_reltime(&info->last_seen);
625 /* Add a new entry */
626 info = os_zalloc(sizeof(*info));
627 os_memcpy(info->addr, addr, ETH_ALEN);
628 os_get_reltime(&info->last_seen);
630 if (iface->num_sta_seen >= iface->conf->track_sta_max_num) {
631 /* Expire oldest entry to make room for a new one */
632 sta_track_expire(iface, 1);
635 wpa_printf(MSG_MSGDUMP, "%s: Add STA tracking entry for "
636 MACSTR, iface->bss[0]->conf->iface, MAC2STR(addr));
637 dl_list_add_tail(&iface->sta_seen, &info->list);
638 iface->num_sta_seen++;
642 struct hostapd_data *
643 sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr,
646 struct hapd_interfaces *interfaces = iface->interfaces;
649 for (i = 0; i < interfaces->count; i++) {
650 struct hostapd_data *hapd = NULL;
652 iface = interfaces->iface[i];
653 for (j = 0; j < iface->num_bss; j++) {
654 hapd = iface->bss[j];
655 if (os_strcmp(ifname, hapd->conf->iface) == 0)
660 if (hapd && sta_track_get(iface, addr))
668 void handle_probe_req(struct hostapd_data *hapd,
669 const struct ieee80211_mgmt *mgmt, size_t len,
673 struct ieee802_11_elems elems;
678 enum ssid_match_result res;
683 ie = mgmt->u.probe_req.variable;
684 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
686 if (hapd->iconf->track_sta_max_num)
687 sta_track_add(hapd->iface, mgmt->sa);
688 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
690 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
691 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
692 mgmt->sa, mgmt->da, mgmt->bssid,
693 ie, ie_len, ssi_signal) > 0)
696 if (!hapd->iconf->send_probe_response)
699 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
700 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
705 if ((!elems.ssid || !elems.supp_rates)) {
706 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
707 "without SSID or supported rates element",
713 * No need to reply if the Probe Request frame was sent on an adjacent
714 * channel. IEEE Std 802.11-2012 describes this as a requirement for an
715 * AP with dot11RadioMeasurementActivated set to true, but strictly
716 * speaking does not allow such ignoring of Probe Request frames if
717 * dot11RadioMeasurementActivated is false. Anyway, this can help reduce
718 * number of unnecessary Probe Response frames for cases where the STA
719 * is less likely to see them (Probe Request frame sent on a
720 * neighboring, but partially overlapping, channel).
722 if (elems.ds_params &&
723 hapd->iface->current_mode &&
724 (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
725 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&
726 hapd->iconf->channel != elems.ds_params[0]) {
727 wpa_printf(MSG_DEBUG,
728 "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u",
729 hapd->iconf->channel, elems.ds_params[0]);
734 if (hapd->p2p && elems.wps_ie) {
736 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
737 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
738 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
739 "due to mismatch with Requested Device "
747 if (hapd->p2p && elems.p2p) {
749 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
750 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
751 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
752 "due to mismatch with Device ID");
758 #endif /* CONFIG_P2P */
760 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
761 elems.ssid_list_len == 0) {
762 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
763 "broadcast SSID ignored", MAC2STR(mgmt->sa));
768 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
769 elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
770 os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
771 P2P_WILDCARD_SSID_LEN) == 0) {
772 /* Process P2P Wildcard SSID like Wildcard SSID */
775 #endif /* CONFIG_P2P */
777 res = ssid_match(hapd, elems.ssid, elems.ssid_len,
778 elems.ssid_list, elems.ssid_list_len);
779 if (res == NO_SSID_MATCH) {
780 if (!(mgmt->da[0] & 0x01)) {
781 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
782 " for foreign SSID '%s' (DA " MACSTR ")%s",
784 wpa_ssid_txt(elems.ssid, elems.ssid_len),
786 elems.ssid_list ? " (SSID list)" : "");
791 #ifdef CONFIG_INTERWORKING
792 if (hapd->conf->interworking &&
793 elems.interworking && elems.interworking_len >= 1) {
794 u8 ant = elems.interworking[0] & 0x0f;
795 if (ant != INTERWORKING_ANT_WILDCARD &&
796 ant != hapd->conf->access_network_type) {
797 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
798 " for mismatching ANT %u ignored",
799 MAC2STR(mgmt->sa), ant);
804 if (hapd->conf->interworking && elems.interworking &&
805 (elems.interworking_len == 7 || elems.interworking_len == 9)) {
807 if (elems.interworking_len == 7)
808 hessid = elems.interworking + 1;
810 hessid = elems.interworking + 1 + 2;
811 if (!is_broadcast_ether_addr(hessid) &&
812 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
813 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
814 " for mismatching HESSID " MACSTR
816 MAC2STR(mgmt->sa), MAC2STR(hessid));
820 #endif /* CONFIG_INTERWORKING */
823 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
824 supp_rates_11b_only(&elems)) {
825 /* Indicates support for 11b rates only */
826 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
827 MACSTR " with only 802.11b rates",
831 #endif /* CONFIG_P2P */
833 /* TODO: verify that supp_rates contains at least one matching rate
834 * with AP configuration */
836 if (hapd->conf->no_probe_resp_if_seen_on &&
837 is_multicast_ether_addr(mgmt->da) &&
838 is_multicast_ether_addr(mgmt->bssid) &&
839 sta_track_seen_on(hapd->iface, mgmt->sa,
840 hapd->conf->no_probe_resp_if_seen_on)) {
841 wpa_printf(MSG_MSGDUMP, "%s: Ignore Probe Request from " MACSTR
842 " since STA has been seen on %s",
843 hapd->conf->iface, MAC2STR(mgmt->sa),
844 hapd->conf->no_probe_resp_if_seen_on);
848 if (hapd->conf->no_probe_resp_if_max_sta &&
849 is_multicast_ether_addr(mgmt->da) &&
850 is_multicast_ether_addr(mgmt->bssid) &&
851 hapd->num_sta >= hapd->conf->max_num_sta &&
852 !ap_get_sta(hapd, mgmt->sa)) {
853 wpa_printf(MSG_MSGDUMP, "%s: Ignore Probe Request from " MACSTR
854 " since no room for additional STA",
855 hapd->conf->iface, MAC2STR(mgmt->sa));
859 #ifdef CONFIG_TESTING_OPTIONS
860 if (hapd->iconf->ignore_probe_probability > 0.0 &&
861 drand48() < hapd->iconf->ignore_probe_probability) {
863 "TESTING: ignoring probe request from " MACSTR,
867 #endif /* CONFIG_TESTING_OPTIONS */
869 resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL,
875 * If this is a broadcast probe request, apply no ack policy to avoid
878 noack = !!(res == WILDCARD_SSID_MATCH &&
879 is_broadcast_ether_addr(mgmt->da));
882 if (hapd->csa_in_progress) {
883 if (hapd->cs_c_off_proberesp)
884 csa_offs[csa_offs_len++] =
885 hapd->cs_c_off_proberesp;
887 if (hapd->cs_c_off_ecsa_proberesp)
888 csa_offs[csa_offs_len++] =
889 hapd->cs_c_off_ecsa_proberesp;
892 ret = hostapd_drv_send_mlme_csa(hapd, resp, resp_len, noack,
893 csa_offs_len ? csa_offs : NULL,
897 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
901 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
902 "SSID", MAC2STR(mgmt->sa),
903 elems.ssid_len == 0 ? "broadcast" : "our");
907 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
910 /* check probe response offloading caps and print warnings */
911 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
915 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
916 (!(hapd->iface->probe_resp_offloads &
917 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
918 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
919 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
920 "Probe Response while not supporting this");
921 #endif /* CONFIG_WPS */
924 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
925 !(hapd->iface->probe_resp_offloads &
926 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
927 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
928 "Probe Response while not supporting this");
929 #endif /* CONFIG_P2P */
931 if (hapd->conf->interworking &&
932 !(hapd->iface->probe_resp_offloads &
933 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
934 wpa_printf(MSG_WARNING, "Device is trying to offload "
935 "Interworking Probe Response while not supporting "
938 /* Generate a Probe Response template for the non-P2P case */
939 return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len);
942 #endif /* NEED_AP_MLME */
945 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
946 struct wpa_driver_ap_params *params)
948 struct ieee80211_mgmt *head = NULL;
950 size_t head_len = 0, tail_len = 0;
955 u8 *pos, *tailpos, *csa_pos;
957 #define BEACON_HEAD_BUF_SIZE 256
958 #define BEACON_TAIL_BUF_SIZE 512
959 head = os_zalloc(BEACON_HEAD_BUF_SIZE);
960 tail_len = BEACON_TAIL_BUF_SIZE;
962 if (hapd->conf->wps_state && hapd->wps_beacon_ie)
963 tail_len += wpabuf_len(hapd->wps_beacon_ie);
964 #endif /* CONFIG_WPS */
966 if (hapd->p2p_beacon_ie)
967 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
968 #endif /* CONFIG_P2P */
970 if (hapd->iface->fst_ies)
971 tail_len += wpabuf_len(hapd->iface->fst_ies);
972 #endif /* CONFIG_FST */
973 if (hapd->conf->vendor_elements)
974 tail_len += wpabuf_len(hapd->conf->vendor_elements);
976 #ifdef CONFIG_IEEE80211AC
977 if (hapd->conf->vendor_vht) {
978 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
979 2 + sizeof(struct ieee80211_vht_operation);
981 #endif /* CONFIG_IEEE80211AC */
983 tailpos = tail = os_malloc(tail_len);
984 if (head == NULL || tail == NULL) {
985 wpa_printf(MSG_ERROR, "Failed to set beacon data");
991 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
992 WLAN_FC_STYPE_BEACON);
993 head->duration = host_to_le16(0);
994 os_memset(head->da, 0xff, ETH_ALEN);
996 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
997 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
998 head->u.beacon.beacon_int =
999 host_to_le16(hapd->iconf->beacon_int);
1001 /* hardware or low-level driver will setup seq_ctrl and timestamp */
1002 capab_info = hostapd_own_capab_info(hapd);
1003 head->u.beacon.capab_info = host_to_le16(capab_info);
1004 pos = &head->u.beacon.variable[0];
1007 *pos++ = WLAN_EID_SSID;
1008 if (hapd->conf->ignore_broadcast_ssid == 2) {
1009 /* clear the data, but keep the correct length of the SSID */
1010 *pos++ = hapd->conf->ssid.ssid_len;
1011 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
1012 pos += hapd->conf->ssid.ssid_len;
1013 } else if (hapd->conf->ignore_broadcast_ssid) {
1014 *pos++ = 0; /* empty SSID */
1016 *pos++ = hapd->conf->ssid.ssid_len;
1017 os_memcpy(pos, hapd->conf->ssid.ssid,
1018 hapd->conf->ssid.ssid_len);
1019 pos += hapd->conf->ssid.ssid_len;
1022 /* Supported rates */
1023 pos = hostapd_eid_supp_rates(hapd, pos);
1026 pos = hostapd_eid_ds_params(hapd, pos);
1028 head_len = pos - (u8 *) head;
1030 tailpos = hostapd_eid_country(hapd, tailpos,
1031 tail + BEACON_TAIL_BUF_SIZE - tailpos);
1033 /* Power Constraint element */
1034 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
1037 csa_pos = hostapd_eid_csa(hapd, tailpos);
1038 if (csa_pos != tailpos)
1039 hapd->cs_c_off_beacon = csa_pos - tail - 1;
1042 /* ERP Information element */
1043 tailpos = hostapd_eid_erp_info(hapd, tailpos);
1045 /* Extended supported rates */
1046 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
1048 /* RSN, MDIE, WPA */
1049 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
1052 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
1053 tail + BEACON_TAIL_BUF_SIZE -
1056 tailpos = hostapd_eid_bss_load(hapd, tailpos,
1057 tail + BEACON_TAIL_BUF_SIZE - tailpos);
1060 csa_pos = hostapd_eid_ecsa(hapd, tailpos);
1061 if (csa_pos != tailpos)
1062 hapd->cs_c_off_ecsa_beacon = csa_pos - tail - 1;
1065 tailpos = hostapd_eid_supported_op_classes(hapd, tailpos);
1067 #ifdef CONFIG_IEEE80211N
1068 /* Secondary Channel Offset element */
1069 /* TODO: The standard doesn't specify a position for this element. */
1070 tailpos = hostapd_eid_secondary_channel(hapd, tailpos);
1072 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
1073 tailpos = hostapd_eid_ht_operation(hapd, tailpos);
1074 #endif /* CONFIG_IEEE80211N */
1076 tailpos = hostapd_eid_ext_capab(hapd, tailpos);
1079 * TODO: Time Advertisement element should only be included in some
1080 * DTIM Beacon frames.
1082 tailpos = hostapd_eid_time_adv(hapd, tailpos);
1084 tailpos = hostapd_eid_interworking(hapd, tailpos);
1085 tailpos = hostapd_eid_adv_proto(hapd, tailpos);
1086 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
1089 if (hapd->iface->fst_ies) {
1090 os_memcpy(tailpos, wpabuf_head(hapd->iface->fst_ies),
1091 wpabuf_len(hapd->iface->fst_ies));
1092 tailpos += wpabuf_len(hapd->iface->fst_ies);
1094 #endif /* CONFIG_FST */
1096 #ifdef CONFIG_IEEE80211AC
1097 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
1098 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
1099 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
1100 tailpos = hostapd_eid_txpower_envelope(hapd, tailpos);
1101 tailpos = hostapd_eid_wb_chsw_wrapper(hapd, tailpos);
1103 if (hapd->conf->vendor_vht)
1104 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
1105 #endif /* CONFIG_IEEE80211AC */
1107 /* Wi-Fi Alliance WMM */
1108 tailpos = hostapd_eid_wmm(hapd, tailpos);
1111 if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
1112 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
1113 wpabuf_len(hapd->wps_beacon_ie));
1114 tailpos += wpabuf_len(hapd->wps_beacon_ie);
1116 #endif /* CONFIG_WPS */
1119 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
1120 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
1121 wpabuf_len(hapd->p2p_beacon_ie));
1122 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
1124 #endif /* CONFIG_P2P */
1125 #ifdef CONFIG_P2P_MANAGER
1126 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
1128 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
1129 #endif /* CONFIG_P2P_MANAGER */
1132 tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
1133 tailpos = hostapd_eid_osen(hapd, tailpos);
1134 #endif /* CONFIG_HS20 */
1136 if (hapd->conf->vendor_elements) {
1137 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
1138 wpabuf_len(hapd->conf->vendor_elements));
1139 tailpos += wpabuf_len(hapd->conf->vendor_elements);
1142 tail_len = tailpos > tail ? tailpos - tail : 0;
1144 resp = hostapd_probe_resp_offloads(hapd, &resp_len);
1145 #endif /* NEED_AP_MLME */
1147 os_memset(params, 0, sizeof(*params));
1148 params->head = (u8 *) head;
1149 params->head_len = head_len;
1150 params->tail = tail;
1151 params->tail_len = tail_len;
1152 params->proberesp = resp;
1153 params->proberesp_len = resp_len;
1154 params->dtim_period = hapd->conf->dtim_period;
1155 params->beacon_int = hapd->iconf->beacon_int;
1156 params->basic_rates = hapd->iface->basic_rates;
1157 params->ssid = hapd->conf->ssid.ssid;
1158 params->ssid_len = hapd->conf->ssid.ssid_len;
1159 if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) ==
1160 (WPA_PROTO_WPA | WPA_PROTO_RSN))
1161 params->pairwise_ciphers = hapd->conf->wpa_pairwise |
1162 hapd->conf->rsn_pairwise;
1163 else if (hapd->conf->wpa & WPA_PROTO_RSN)
1164 params->pairwise_ciphers = hapd->conf->rsn_pairwise;
1165 else if (hapd->conf->wpa & WPA_PROTO_WPA)
1166 params->pairwise_ciphers = hapd->conf->wpa_pairwise;
1167 params->group_cipher = hapd->conf->wpa_group;
1168 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
1169 params->auth_algs = hapd->conf->auth_algs;
1170 params->wpa_version = hapd->conf->wpa;
1171 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
1172 (hapd->conf->ieee802_1x &&
1173 (hapd->conf->default_wep_key_len ||
1174 hapd->conf->individual_wep_key_len));
1175 switch (hapd->conf->ignore_broadcast_ssid) {
1177 params->hide_ssid = NO_SSID_HIDING;
1180 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
1183 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
1186 params->isolate = hapd->conf->isolate;
1187 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
1189 params->cts_protect = !!(ieee802_11_erp_info(hapd) &
1190 ERP_INFO_USE_PROTECTION);
1191 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
1192 hapd->iconf->preamble == SHORT_PREAMBLE;
1193 if (hapd->iface->current_mode &&
1194 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
1195 params->short_slot_time =
1196 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
1198 params->short_slot_time = -1;
1199 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
1200 params->ht_opmode = -1;
1202 params->ht_opmode = hapd->iface->ht_op_mode;
1203 #endif /* NEED_AP_MLME */
1204 params->interworking = hapd->conf->interworking;
1205 if (hapd->conf->interworking &&
1206 !is_zero_ether_addr(hapd->conf->hessid))
1207 params->hessid = hapd->conf->hessid;
1208 params->access_network_type = hapd->conf->access_network_type;
1209 params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
1211 params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow;
1212 #endif /* CONFIG_P2P */
1214 params->disable_dgaf = hapd->conf->disable_dgaf;
1215 if (hapd->conf->osen) {
1216 params->privacy = 1;
1219 #endif /* CONFIG_HS20 */
1224 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1226 os_free(params->tail);
1227 params->tail = NULL;
1228 os_free(params->head);
1229 params->head = NULL;
1230 os_free(params->proberesp);
1231 params->proberesp = NULL;
1235 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1237 struct wpa_driver_ap_params params;
1238 struct hostapd_freq_params freq;
1239 struct hostapd_iface *iface = hapd->iface;
1240 struct hostapd_config *iconf = iface->conf;
1241 struct wpabuf *beacon, *proberesp, *assocresp;
1244 if (hapd->csa_in_progress) {
1245 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1249 hapd->beacon_set_done = 1;
1251 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
1254 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1258 params.beacon_ies = beacon;
1259 params.proberesp_ies = proberesp;
1260 params.assocresp_ies = assocresp;
1261 params.reenable = hapd->reenable_beacon;
1262 hapd->reenable_beacon = 0;
1264 if (iface->current_mode &&
1265 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1266 iconf->channel, iconf->ieee80211n,
1268 iconf->secondary_channel,
1269 iconf->vht_oper_chwidth,
1270 iconf->vht_oper_centr_freq_seg0_idx,
1271 iconf->vht_oper_centr_freq_seg1_idx,
1272 iface->current_mode->vht_capab) == 0)
1273 params.freq = &freq;
1275 res = hostapd_drv_set_ap(hapd, ¶ms);
1276 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1278 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1282 ieee802_11_free_ap_params(¶ms);
1287 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1292 for (i = 0; i < iface->num_bss; i++) {
1293 if (iface->bss[i]->started &&
1294 ieee802_11_set_beacon(iface->bss[i]) < 0)
1302 /* only update beacons if started */
1303 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1308 for (i = 0; i < iface->num_bss; i++) {
1309 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1310 ieee802_11_set_beacon(iface->bss[i]) < 0)
1317 #endif /* CONFIG_NATIVE_WINDOWS */