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)
302 if (!hapd->cs_freq_params.freq)
305 if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
309 *eid++ = WLAN_EID_CHANNEL_SWITCH;
311 *eid++ = hapd->cs_block_tx;
313 *eid++ = hapd->cs_count;
319 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
323 if (!hapd->cs_freq_params.sec_channel_offset)
326 if (hapd->cs_freq_params.sec_channel_offset == -1)
327 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
328 else if (hapd->cs_freq_params.sec_channel_offset == 1)
329 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
333 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
341 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
342 u8 *start, unsigned int *csa_counter_off)
346 if (!csa_counter_off)
349 *csa_counter_off = 0;
350 pos = hostapd_eid_csa(hapd, pos);
352 if (pos != old_pos) {
353 /* save an offset to the counter - should be last byte */
354 *csa_counter_off = pos - start - 1;
355 pos = hostapd_eid_secondary_channel(hapd, pos);
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;
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);
427 /* ERP Information element */
428 pos = hostapd_eid_erp_info(hapd, pos);
430 /* Extended supported rates */
431 pos = hostapd_eid_ext_supp_rates(hapd, pos);
434 pos = hostapd_eid_wpa(hapd, pos, epos - pos);
436 pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
438 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
440 #ifdef CONFIG_IEEE80211N
441 pos = hostapd_eid_ht_capabilities(hapd, pos);
442 pos = hostapd_eid_ht_operation(hapd, pos);
443 #endif /* CONFIG_IEEE80211N */
445 pos = hostapd_eid_ext_capab(hapd, pos);
447 pos = hostapd_eid_time_adv(hapd, pos);
448 pos = hostapd_eid_time_zone(hapd, pos);
450 pos = hostapd_eid_interworking(hapd, pos);
451 pos = hostapd_eid_adv_proto(hapd, pos);
452 pos = hostapd_eid_roaming_consortium(hapd, pos);
454 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
455 &hapd->cs_c_off_proberesp);
458 if (hapd->iface->fst_ies) {
459 os_memcpy(pos, wpabuf_head(hapd->iface->fst_ies),
460 wpabuf_len(hapd->iface->fst_ies));
461 pos += wpabuf_len(hapd->iface->fst_ies);
463 #endif /* CONFIG_FST */
465 #ifdef CONFIG_IEEE80211AC
466 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
467 pos = hostapd_eid_vht_capabilities(hapd, pos);
468 pos = hostapd_eid_vht_operation(hapd, pos);
470 if (hapd->conf->vendor_vht)
471 pos = hostapd_eid_vendor_vht(hapd, pos);
472 #endif /* CONFIG_IEEE80211AC */
474 /* Wi-Fi Alliance WMM */
475 pos = hostapd_eid_wmm(hapd, pos);
478 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
479 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
480 wpabuf_len(hapd->wps_probe_resp_ie));
481 pos += wpabuf_len(hapd->wps_probe_resp_ie);
483 #endif /* CONFIG_WPS */
486 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
487 hapd->p2p_probe_resp_ie) {
488 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
489 wpabuf_len(hapd->p2p_probe_resp_ie));
490 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
492 #endif /* CONFIG_P2P */
493 #ifdef CONFIG_P2P_MANAGER
494 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
496 pos = hostapd_eid_p2p_manage(hapd, pos);
497 #endif /* CONFIG_P2P_MANAGER */
500 pos = hostapd_eid_hs20_indication(hapd, pos);
501 pos = hostapd_eid_osen(hapd, pos);
502 #endif /* CONFIG_HS20 */
504 if (hapd->conf->vendor_elements) {
505 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
506 wpabuf_len(hapd->conf->vendor_elements));
507 pos += wpabuf_len(hapd->conf->vendor_elements);
510 *resp_len = pos - (u8 *) resp;
515 enum ssid_match_result {
521 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
522 const u8 *ssid, size_t ssid_len,
524 size_t ssid_list_len)
531 if (ssid_len == hapd->conf->ssid.ssid_len &&
532 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
533 return EXACT_SSID_MATCH;
535 if (ssid_list == NULL)
536 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
539 end = ssid_list + ssid_list_len;
540 while (pos + 1 <= end) {
541 if (pos + 2 + pos[1] > end)
545 if (pos[1] == hapd->conf->ssid.ssid_len &&
546 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
547 return EXACT_SSID_MATCH;
551 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
555 void sta_track_expire(struct hostapd_iface *iface, int force)
557 struct os_reltime now;
558 struct hostapd_sta_info *info;
560 if (!iface->num_sta_seen)
563 os_get_reltime(&now);
564 while ((info = dl_list_first(&iface->sta_seen, struct hostapd_sta_info,
567 !os_reltime_expired(&now, &info->last_seen,
568 iface->conf->track_sta_max_age))
572 wpa_printf(MSG_MSGDUMP, "%s: Expire STA tracking entry for "
573 MACSTR, iface->bss[0]->conf->iface,
574 MAC2STR(info->addr));
575 dl_list_del(&info->list);
576 iface->num_sta_seen--;
582 static struct hostapd_sta_info * sta_track_get(struct hostapd_iface *iface,
585 struct hostapd_sta_info *info;
587 dl_list_for_each(info, &iface->sta_seen, struct hostapd_sta_info, list)
588 if (os_memcmp(addr, info->addr, ETH_ALEN) == 0)
595 void sta_track_add(struct hostapd_iface *iface, const u8 *addr)
597 struct hostapd_sta_info *info;
599 info = sta_track_get(iface, addr);
601 /* Move the most recent entry to the end of the list */
602 dl_list_del(&info->list);
603 dl_list_add_tail(&iface->sta_seen, &info->list);
604 os_get_reltime(&info->last_seen);
608 /* Add a new entry */
609 info = os_zalloc(sizeof(*info));
610 os_memcpy(info->addr, addr, ETH_ALEN);
611 os_get_reltime(&info->last_seen);
613 if (iface->num_sta_seen >= iface->conf->track_sta_max_num) {
614 /* Expire oldest entry to make room for a new one */
615 sta_track_expire(iface, 1);
618 wpa_printf(MSG_MSGDUMP, "%s: Add STA tracking entry for "
619 MACSTR, iface->bss[0]->conf->iface, MAC2STR(addr));
620 dl_list_add_tail(&iface->sta_seen, &info->list);
621 iface->num_sta_seen++;
625 struct hostapd_data *
626 sta_track_seen_on(struct hostapd_iface *iface, const u8 *addr,
629 struct hapd_interfaces *interfaces = iface->interfaces;
632 for (i = 0; i < interfaces->count; i++) {
633 struct hostapd_data *hapd = NULL;
635 iface = interfaces->iface[i];
636 for (j = 0; j < iface->num_bss; j++) {
637 hapd = iface->bss[j];
638 if (os_strcmp(ifname, hapd->conf->iface) == 0)
643 if (hapd && sta_track_get(iface, addr))
651 void handle_probe_req(struct hostapd_data *hapd,
652 const struct ieee80211_mgmt *mgmt, size_t len,
656 struct ieee802_11_elems elems;
661 enum ssid_match_result res;
663 ie = mgmt->u.probe_req.variable;
664 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
666 if (hapd->iconf->track_sta_max_num)
667 sta_track_add(hapd->iface, mgmt->sa);
668 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
670 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
671 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
672 mgmt->sa, mgmt->da, mgmt->bssid,
673 ie, ie_len, ssi_signal) > 0)
676 if (!hapd->iconf->send_probe_response)
679 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
680 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
685 if ((!elems.ssid || !elems.supp_rates)) {
686 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
687 "without SSID or supported rates element",
693 * No need to reply if the Probe Request frame was sent on an adjacent
694 * channel. IEEE Std 802.11-2012 describes this as a requirement for an
695 * AP with dot11RadioMeasurementActivated set to true, but strictly
696 * speaking does not allow such ignoring of Probe Request frames if
697 * dot11RadioMeasurementActivated is false. Anyway, this can help reduce
698 * number of unnecessary Probe Response frames for cases where the STA
699 * is less likely to see them (Probe Request frame sent on a
700 * neighboring, but partially overlapping, channel).
702 if (elems.ds_params &&
703 hapd->iface->current_mode &&
704 (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
705 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&
706 hapd->iconf->channel != elems.ds_params[0]) {
707 wpa_printf(MSG_DEBUG,
708 "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u",
709 hapd->iconf->channel, elems.ds_params[0]);
714 if (hapd->p2p && elems.wps_ie) {
716 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
717 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
718 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
719 "due to mismatch with Requested Device "
727 if (hapd->p2p && elems.p2p) {
729 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
730 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
731 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
732 "due to mismatch with Device ID");
738 #endif /* CONFIG_P2P */
740 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
741 elems.ssid_list_len == 0) {
742 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
743 "broadcast SSID ignored", MAC2STR(mgmt->sa));
748 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
749 elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
750 os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
751 P2P_WILDCARD_SSID_LEN) == 0) {
752 /* Process P2P Wildcard SSID like Wildcard SSID */
755 #endif /* CONFIG_P2P */
757 res = ssid_match(hapd, elems.ssid, elems.ssid_len,
758 elems.ssid_list, elems.ssid_list_len);
759 if (res == NO_SSID_MATCH) {
760 if (!(mgmt->da[0] & 0x01)) {
761 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
762 " for foreign SSID '%s' (DA " MACSTR ")%s",
764 wpa_ssid_txt(elems.ssid, elems.ssid_len),
766 elems.ssid_list ? " (SSID list)" : "");
771 #ifdef CONFIG_INTERWORKING
772 if (hapd->conf->interworking &&
773 elems.interworking && elems.interworking_len >= 1) {
774 u8 ant = elems.interworking[0] & 0x0f;
775 if (ant != INTERWORKING_ANT_WILDCARD &&
776 ant != hapd->conf->access_network_type) {
777 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
778 " for mismatching ANT %u ignored",
779 MAC2STR(mgmt->sa), ant);
784 if (hapd->conf->interworking && elems.interworking &&
785 (elems.interworking_len == 7 || elems.interworking_len == 9)) {
787 if (elems.interworking_len == 7)
788 hessid = elems.interworking + 1;
790 hessid = elems.interworking + 1 + 2;
791 if (!is_broadcast_ether_addr(hessid) &&
792 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
793 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
794 " for mismatching HESSID " MACSTR
796 MAC2STR(mgmt->sa), MAC2STR(hessid));
800 #endif /* CONFIG_INTERWORKING */
803 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
804 supp_rates_11b_only(&elems)) {
805 /* Indicates support for 11b rates only */
806 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
807 MACSTR " with only 802.11b rates",
811 #endif /* CONFIG_P2P */
813 /* TODO: verify that supp_rates contains at least one matching rate
814 * with AP configuration */
816 if (hapd->conf->no_probe_resp_if_seen_on &&
817 is_multicast_ether_addr(mgmt->da) &&
818 is_multicast_ether_addr(mgmt->bssid) &&
819 sta_track_seen_on(hapd->iface, mgmt->sa,
820 hapd->conf->no_probe_resp_if_seen_on)) {
821 wpa_printf(MSG_MSGDUMP, "%s: Ignore Probe Request from " MACSTR
822 " since STA has been seen on %s",
823 hapd->conf->iface, MAC2STR(mgmt->sa),
824 hapd->conf->no_probe_resp_if_seen_on);
828 #ifdef CONFIG_TESTING_OPTIONS
829 if (hapd->iconf->ignore_probe_probability > 0.0 &&
830 drand48() < hapd->iconf->ignore_probe_probability) {
832 "TESTING: ignoring probe request from " MACSTR,
836 #endif /* CONFIG_TESTING_OPTIONS */
838 resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL,
844 * If this is a broadcast probe request, apply no ack policy to avoid
847 noack = !!(res == WILDCARD_SSID_MATCH &&
848 is_broadcast_ether_addr(mgmt->da));
850 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
851 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
855 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
856 "SSID", MAC2STR(mgmt->sa),
857 elems.ssid_len == 0 ? "broadcast" : "our");
861 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
864 /* check probe response offloading caps and print warnings */
865 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
869 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
870 (!(hapd->iface->probe_resp_offloads &
871 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
872 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
873 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
874 "Probe Response while not supporting this");
875 #endif /* CONFIG_WPS */
878 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
879 !(hapd->iface->probe_resp_offloads &
880 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
881 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
882 "Probe Response while not supporting this");
883 #endif /* CONFIG_P2P */
885 if (hapd->conf->interworking &&
886 !(hapd->iface->probe_resp_offloads &
887 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
888 wpa_printf(MSG_WARNING, "Device is trying to offload "
889 "Interworking Probe Response while not supporting "
892 /* Generate a Probe Response template for the non-P2P case */
893 return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len);
896 #endif /* NEED_AP_MLME */
899 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
900 struct wpa_driver_ap_params *params)
902 struct ieee80211_mgmt *head = NULL;
904 size_t head_len = 0, tail_len = 0;
911 #define BEACON_HEAD_BUF_SIZE 256
912 #define BEACON_TAIL_BUF_SIZE 512
913 head = os_zalloc(BEACON_HEAD_BUF_SIZE);
914 tail_len = BEACON_TAIL_BUF_SIZE;
916 if (hapd->conf->wps_state && hapd->wps_beacon_ie)
917 tail_len += wpabuf_len(hapd->wps_beacon_ie);
918 #endif /* CONFIG_WPS */
920 if (hapd->p2p_beacon_ie)
921 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
922 #endif /* CONFIG_P2P */
924 if (hapd->iface->fst_ies)
925 tail_len += wpabuf_len(hapd->iface->fst_ies);
926 #endif /* CONFIG_FST */
927 if (hapd->conf->vendor_elements)
928 tail_len += wpabuf_len(hapd->conf->vendor_elements);
930 #ifdef CONFIG_IEEE80211AC
931 if (hapd->conf->vendor_vht) {
932 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
933 2 + sizeof(struct ieee80211_vht_operation);
935 #endif /* CONFIG_IEEE80211AC */
937 tailpos = tail = os_malloc(tail_len);
938 if (head == NULL || tail == NULL) {
939 wpa_printf(MSG_ERROR, "Failed to set beacon data");
945 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
946 WLAN_FC_STYPE_BEACON);
947 head->duration = host_to_le16(0);
948 os_memset(head->da, 0xff, ETH_ALEN);
950 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
951 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
952 head->u.beacon.beacon_int =
953 host_to_le16(hapd->iconf->beacon_int);
955 /* hardware or low-level driver will setup seq_ctrl and timestamp */
956 capab_info = hostapd_own_capab_info(hapd);
957 head->u.beacon.capab_info = host_to_le16(capab_info);
958 pos = &head->u.beacon.variable[0];
961 *pos++ = WLAN_EID_SSID;
962 if (hapd->conf->ignore_broadcast_ssid == 2) {
963 /* clear the data, but keep the correct length of the SSID */
964 *pos++ = hapd->conf->ssid.ssid_len;
965 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
966 pos += hapd->conf->ssid.ssid_len;
967 } else if (hapd->conf->ignore_broadcast_ssid) {
968 *pos++ = 0; /* empty SSID */
970 *pos++ = hapd->conf->ssid.ssid_len;
971 os_memcpy(pos, hapd->conf->ssid.ssid,
972 hapd->conf->ssid.ssid_len);
973 pos += hapd->conf->ssid.ssid_len;
976 /* Supported rates */
977 pos = hostapd_eid_supp_rates(hapd, pos);
980 pos = hostapd_eid_ds_params(hapd, pos);
982 head_len = pos - (u8 *) head;
984 tailpos = hostapd_eid_country(hapd, tailpos,
985 tail + BEACON_TAIL_BUF_SIZE - tailpos);
987 /* Power Constraint element */
988 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
990 /* ERP Information element */
991 tailpos = hostapd_eid_erp_info(hapd, tailpos);
993 /* Extended supported rates */
994 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
997 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
1000 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
1001 tail + BEACON_TAIL_BUF_SIZE -
1004 tailpos = hostapd_eid_bss_load(hapd, tailpos,
1005 tail + BEACON_TAIL_BUF_SIZE - tailpos);
1007 #ifdef CONFIG_IEEE80211N
1008 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
1009 tailpos = hostapd_eid_ht_operation(hapd, tailpos);
1010 #endif /* CONFIG_IEEE80211N */
1012 tailpos = hostapd_eid_ext_capab(hapd, tailpos);
1015 * TODO: Time Advertisement element should only be included in some
1016 * DTIM Beacon frames.
1018 tailpos = hostapd_eid_time_adv(hapd, tailpos);
1020 tailpos = hostapd_eid_interworking(hapd, tailpos);
1021 tailpos = hostapd_eid_adv_proto(hapd, tailpos);
1022 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
1023 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
1024 &hapd->cs_c_off_beacon);
1027 if (hapd->iface->fst_ies) {
1028 os_memcpy(tailpos, wpabuf_head(hapd->iface->fst_ies),
1029 wpabuf_len(hapd->iface->fst_ies));
1030 tailpos += wpabuf_len(hapd->iface->fst_ies);
1032 #endif /* CONFIG_FST */
1034 #ifdef CONFIG_IEEE80211AC
1035 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
1036 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
1037 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
1039 if (hapd->conf->vendor_vht)
1040 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
1041 #endif /* CONFIG_IEEE80211AC */
1043 /* Wi-Fi Alliance WMM */
1044 tailpos = hostapd_eid_wmm(hapd, tailpos);
1047 if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
1048 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
1049 wpabuf_len(hapd->wps_beacon_ie));
1050 tailpos += wpabuf_len(hapd->wps_beacon_ie);
1052 #endif /* CONFIG_WPS */
1055 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
1056 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
1057 wpabuf_len(hapd->p2p_beacon_ie));
1058 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
1060 #endif /* CONFIG_P2P */
1061 #ifdef CONFIG_P2P_MANAGER
1062 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
1064 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
1065 #endif /* CONFIG_P2P_MANAGER */
1068 tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
1069 tailpos = hostapd_eid_osen(hapd, tailpos);
1070 #endif /* CONFIG_HS20 */
1072 if (hapd->conf->vendor_elements) {
1073 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
1074 wpabuf_len(hapd->conf->vendor_elements));
1075 tailpos += wpabuf_len(hapd->conf->vendor_elements);
1078 tail_len = tailpos > tail ? tailpos - tail : 0;
1080 resp = hostapd_probe_resp_offloads(hapd, &resp_len);
1081 #endif /* NEED_AP_MLME */
1083 os_memset(params, 0, sizeof(*params));
1084 params->head = (u8 *) head;
1085 params->head_len = head_len;
1086 params->tail = tail;
1087 params->tail_len = tail_len;
1088 params->proberesp = resp;
1089 params->proberesp_len = resp_len;
1090 params->dtim_period = hapd->conf->dtim_period;
1091 params->beacon_int = hapd->iconf->beacon_int;
1092 params->basic_rates = hapd->iface->basic_rates;
1093 params->ssid = hapd->conf->ssid.ssid;
1094 params->ssid_len = hapd->conf->ssid.ssid_len;
1095 if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) ==
1096 (WPA_PROTO_WPA | WPA_PROTO_RSN))
1097 params->pairwise_ciphers = hapd->conf->wpa_pairwise |
1098 hapd->conf->rsn_pairwise;
1099 else if (hapd->conf->wpa & WPA_PROTO_RSN)
1100 params->pairwise_ciphers = hapd->conf->rsn_pairwise;
1101 else if (hapd->conf->wpa & WPA_PROTO_WPA)
1102 params->pairwise_ciphers = hapd->conf->wpa_pairwise;
1103 params->group_cipher = hapd->conf->wpa_group;
1104 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
1105 params->auth_algs = hapd->conf->auth_algs;
1106 params->wpa_version = hapd->conf->wpa;
1107 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
1108 (hapd->conf->ieee802_1x &&
1109 (hapd->conf->default_wep_key_len ||
1110 hapd->conf->individual_wep_key_len));
1111 switch (hapd->conf->ignore_broadcast_ssid) {
1113 params->hide_ssid = NO_SSID_HIDING;
1116 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
1119 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
1122 params->isolate = hapd->conf->isolate;
1123 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
1125 params->cts_protect = !!(ieee802_11_erp_info(hapd) &
1126 ERP_INFO_USE_PROTECTION);
1127 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
1128 hapd->iconf->preamble == SHORT_PREAMBLE;
1129 if (hapd->iface->current_mode &&
1130 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
1131 params->short_slot_time =
1132 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
1134 params->short_slot_time = -1;
1135 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
1136 params->ht_opmode = -1;
1138 params->ht_opmode = hapd->iface->ht_op_mode;
1139 #endif /* NEED_AP_MLME */
1140 params->interworking = hapd->conf->interworking;
1141 if (hapd->conf->interworking &&
1142 !is_zero_ether_addr(hapd->conf->hessid))
1143 params->hessid = hapd->conf->hessid;
1144 params->access_network_type = hapd->conf->access_network_type;
1145 params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
1147 params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow;
1148 #endif /* CONFIG_P2P */
1150 params->disable_dgaf = hapd->conf->disable_dgaf;
1151 if (hapd->conf->osen) {
1152 params->privacy = 1;
1155 #endif /* CONFIG_HS20 */
1160 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1162 os_free(params->tail);
1163 params->tail = NULL;
1164 os_free(params->head);
1165 params->head = NULL;
1166 os_free(params->proberesp);
1167 params->proberesp = NULL;
1171 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1173 struct wpa_driver_ap_params params;
1174 struct hostapd_freq_params freq;
1175 struct hostapd_iface *iface = hapd->iface;
1176 struct hostapd_config *iconf = iface->conf;
1177 struct wpabuf *beacon, *proberesp, *assocresp;
1180 if (hapd->csa_in_progress) {
1181 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1185 hapd->beacon_set_done = 1;
1187 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
1190 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1194 params.beacon_ies = beacon;
1195 params.proberesp_ies = proberesp;
1196 params.assocresp_ies = assocresp;
1197 params.reenable = hapd->reenable_beacon;
1198 hapd->reenable_beacon = 0;
1200 if (iface->current_mode &&
1201 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1202 iconf->channel, iconf->ieee80211n,
1204 iconf->secondary_channel,
1205 iconf->vht_oper_chwidth,
1206 iconf->vht_oper_centr_freq_seg0_idx,
1207 iconf->vht_oper_centr_freq_seg1_idx,
1208 iface->current_mode->vht_capab) == 0)
1209 params.freq = &freq;
1211 res = hostapd_drv_set_ap(hapd, ¶ms);
1212 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1214 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1218 ieee802_11_free_ap_params(¶ms);
1223 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1228 for (i = 0; i < iface->num_bss; i++) {
1229 if (iface->bss[i]->started &&
1230 ieee802_11_set_beacon(iface->bss[i]) < 0)
1238 /* only update beacons if started */
1239 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1244 for (i = 0; i < iface->num_bss; i++) {
1245 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1246 ieee802_11_set_beacon(iface->bss[i]) < 0)
1253 #endif /* CONFIG_NATIVE_WINDOWS */