1/*
2 * hostapd / IEEE 802.11 Management
3 * Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "utils/includes.h"
10
11#include "utils/common.h"
12#include "common/ieee802_11_defs.h"
13#include "hostapd.h"
14#include "sta_info.h"
15#include "ap_config.h"
16#include "ap_drv_ops.h"
17#include "ieee802_11.h"
18
19
20#ifdef CONFIG_IEEE80211W
21
22u8 * hostapd_eid_assoc_comeback_time(struct hostapd_data *hapd,
23				     struct sta_info *sta, u8 *eid)
24{
25	u8 *pos = eid;
26	u32 timeout, tu;
27	struct os_reltime now, passed;
28
29	*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
30	*pos++ = 5;
31	*pos++ = WLAN_TIMEOUT_ASSOC_COMEBACK;
32	os_get_reltime(&now);
33	os_reltime_sub(&now, &sta->sa_query_start, &passed);
34	tu = (passed.sec * 1000000 + passed.usec) / 1024;
35	if (hapd->conf->assoc_sa_query_max_timeout > tu)
36		timeout = hapd->conf->assoc_sa_query_max_timeout - tu;
37	else
38		timeout = 0;
39	if (timeout < hapd->conf->assoc_sa_query_max_timeout)
40		timeout++; /* add some extra time for local timers */
41	WPA_PUT_LE32(pos, timeout);
42	pos += 4;
43
44	return pos;
45}
46
47
48/* MLME-SAQuery.request */
49void ieee802_11_send_sa_query_req(struct hostapd_data *hapd,
50				  const u8 *addr, const u8 *trans_id)
51{
52	struct ieee80211_mgmt mgmt;
53	u8 *end;
54
55	wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Request to "
56		   MACSTR, MAC2STR(addr));
57	wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
58		    trans_id, WLAN_SA_QUERY_TR_ID_LEN);
59
60	os_memset(&mgmt, 0, sizeof(mgmt));
61	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
62					  WLAN_FC_STYPE_ACTION);
63	os_memcpy(mgmt.da, addr, ETH_ALEN);
64	os_memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
65	os_memcpy(mgmt.bssid, hapd->own_addr, ETH_ALEN);
66	mgmt.u.action.category = WLAN_ACTION_SA_QUERY;
67	mgmt.u.action.u.sa_query_req.action = WLAN_SA_QUERY_REQUEST;
68	os_memcpy(mgmt.u.action.u.sa_query_req.trans_id, trans_id,
69		  WLAN_SA_QUERY_TR_ID_LEN);
70	end = mgmt.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
71	if (hostapd_drv_send_mlme(hapd, &mgmt, end - (u8 *) &mgmt, 0) < 0)
72		wpa_printf(MSG_INFO, "ieee802_11_send_sa_query_req: send failed");
73}
74
75
76static void ieee802_11_send_sa_query_resp(struct hostapd_data *hapd,
77					  const u8 *sa, const u8 *trans_id)
78{
79	struct sta_info *sta;
80	struct ieee80211_mgmt resp;
81	u8 *end;
82
83	wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Request from "
84		   MACSTR, MAC2STR(sa));
85	wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
86		    trans_id, WLAN_SA_QUERY_TR_ID_LEN);
87
88	sta = ap_get_sta(hapd, sa);
89	if (sta == NULL || !(sta->flags & WLAN_STA_ASSOC)) {
90		wpa_printf(MSG_DEBUG, "IEEE 802.11: Ignore SA Query Request "
91			   "from unassociated STA " MACSTR, MAC2STR(sa));
92		return;
93	}
94
95	wpa_printf(MSG_DEBUG, "IEEE 802.11: Sending SA Query Response to "
96		   MACSTR, MAC2STR(sa));
97
98	os_memset(&resp, 0, sizeof(resp));
99	resp.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
100					  WLAN_FC_STYPE_ACTION);
101	os_memcpy(resp.da, sa, ETH_ALEN);
102	os_memcpy(resp.sa, hapd->own_addr, ETH_ALEN);
103	os_memcpy(resp.bssid, hapd->own_addr, ETH_ALEN);
104	resp.u.action.category = WLAN_ACTION_SA_QUERY;
105	resp.u.action.u.sa_query_req.action = WLAN_SA_QUERY_RESPONSE;
106	os_memcpy(resp.u.action.u.sa_query_req.trans_id, trans_id,
107		  WLAN_SA_QUERY_TR_ID_LEN);
108	end = resp.u.action.u.sa_query_req.trans_id + WLAN_SA_QUERY_TR_ID_LEN;
109	if (hostapd_drv_send_mlme(hapd, &resp, end - (u8 *) &resp, 0) < 0)
110		wpa_printf(MSG_INFO, "ieee80211_mgmt_sa_query_request: send failed");
111}
112
113
114void ieee802_11_sa_query_action(struct hostapd_data *hapd, const u8 *sa,
115				const u8 action_type, const u8 *trans_id)
116{
117	struct sta_info *sta;
118	int i;
119
120	if (action_type == WLAN_SA_QUERY_REQUEST) {
121		ieee802_11_send_sa_query_resp(hapd, sa, trans_id);
122		return;
123	}
124
125	if (action_type != WLAN_SA_QUERY_RESPONSE) {
126		wpa_printf(MSG_DEBUG, "IEEE 802.11: Unexpected SA Query "
127			   "Action %d", action_type);
128		return;
129	}
130
131	wpa_printf(MSG_DEBUG, "IEEE 802.11: Received SA Query Response from "
132		   MACSTR, MAC2STR(sa));
133	wpa_hexdump(MSG_DEBUG, "IEEE 802.11: SA Query Transaction ID",
134		    trans_id, WLAN_SA_QUERY_TR_ID_LEN);
135
136	/* MLME-SAQuery.confirm */
137
138	sta = ap_get_sta(hapd, sa);
139	if (sta == NULL || sta->sa_query_trans_id == NULL) {
140		wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching STA with "
141			   "pending SA Query request found");
142		return;
143	}
144
145	for (i = 0; i < sta->sa_query_count; i++) {
146		if (os_memcmp(sta->sa_query_trans_id +
147			      i * WLAN_SA_QUERY_TR_ID_LEN,
148			      trans_id, WLAN_SA_QUERY_TR_ID_LEN) == 0)
149			break;
150	}
151
152	if (i >= sta->sa_query_count) {
153		wpa_printf(MSG_DEBUG, "IEEE 802.11: No matching SA Query "
154			   "transaction identifier found");
155		return;
156	}
157
158	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
159		       HOSTAPD_LEVEL_DEBUG,
160		       "Reply to pending SA Query received");
161	ap_sta_stop_sa_query(hapd, sta);
162}
163
164#endif /* CONFIG_IEEE80211W */
165
166
167static void hostapd_ext_capab_byte(struct hostapd_data *hapd, u8 *pos, int idx)
168{
169	*pos = 0x00;
170
171	switch (idx) {
172	case 0: /* Bits 0-7 */
173		if (hapd->iconf->obss_interval)
174			*pos |= 0x01; /* Bit 0 - Coexistence management */
175		if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_AP_CSA)
176			*pos |= 0x04; /* Bit 2 - Extended Channel Switching */
177		break;
178	case 1: /* Bits 8-15 */
179		if (hapd->conf->proxy_arp)
180			*pos |= 0x10; /* Bit 12 - Proxy ARP */
181		break;
182	case 2: /* Bits 16-23 */
183		if (hapd->conf->wnm_sleep_mode)
184			*pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
185		if (hapd->conf->bss_transition)
186			*pos |= 0x08; /* Bit 19 - BSS Transition */
187		break;
188	case 3: /* Bits 24-31 */
189#ifdef CONFIG_WNM
190		*pos |= 0x02; /* Bit 25 - SSID List */
191#endif /* CONFIG_WNM */
192		if (hapd->conf->time_advertisement == 2)
193			*pos |= 0x08; /* Bit 27 - UTC TSF Offset */
194		if (hapd->conf->interworking)
195			*pos |= 0x80; /* Bit 31 - Interworking */
196		break;
197	case 4: /* Bits 32-39 */
198		if (hapd->conf->qos_map_set_len)
199			*pos |= 0x01; /* Bit 32 - QoS Map */
200		if (hapd->conf->tdls & TDLS_PROHIBIT)
201			*pos |= 0x40; /* Bit 38 - TDLS Prohibited */
202		if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH) {
203			/* Bit 39 - TDLS Channel Switching Prohibited */
204			*pos |= 0x80;
205		}
206		break;
207	case 5: /* Bits 40-47 */
208#ifdef CONFIG_HS20
209		if (hapd->conf->hs20)
210			*pos |= 0x40; /* Bit 46 - WNM-Notification */
211#endif /* CONFIG_HS20 */
212#ifdef CONFIG_MBO
213		if (hapd->conf->mbo_enabled)
214			*pos |= 0x40; /* Bit 46 - WNM-Notification */
215#endif /* CONFIG_MBO */
216		break;
217	case 6: /* Bits 48-55 */
218		if (hapd->conf->ssid.utf8_ssid)
219			*pos |= 0x01; /* Bit 48 - UTF-8 SSID */
220		break;
221	case 7: /* Bits 56-63 */
222		break;
223	case 8: /* Bits 64-71 */
224		if (hapd->conf->ftm_responder)
225			*pos |= 0x40; /* Bit 70 - FTM responder */
226		if (hapd->conf->ftm_initiator)
227			*pos |= 0x80; /* Bit 71 - FTM initiator */
228	case 9: /* Bits 72-79 */
229#ifdef CONFIG_FILS
230		if ((hapd->conf->wpa & WPA_PROTO_RSN) &&
231		    wpa_key_mgmt_fils(hapd->conf->wpa_key_mgmt))
232			*pos |= 0x01;
233#endif /* CONFIG_FILS */
234		break;
235	}
236}
237
238
239u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
240{
241	u8 *pos = eid;
242	u8 len = 0, i;
243
244	if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
245		len = 5;
246	if (len < 4 && hapd->conf->interworking)
247		len = 4;
248	if (len < 3 && hapd->conf->wnm_sleep_mode)
249		len = 3;
250	if (len < 1 && hapd->iconf->obss_interval)
251		len = 1;
252	if (len < 7 && hapd->conf->ssid.utf8_ssid)
253		len = 7;
254	if (len < 9 &&
255	    (hapd->conf->ftm_initiator || hapd->conf->ftm_responder))
256		len = 9;
257#ifdef CONFIG_WNM
258	if (len < 4)
259		len = 4;
260#endif /* CONFIG_WNM */
261#ifdef CONFIG_HS20
262	if (hapd->conf->hs20 && len < 6)
263		len = 6;
264#endif /* CONFIG_HS20 */
265#ifdef CONFIG_MBO
266	if (hapd->conf->mbo_enabled && len < 6)
267		len = 6;
268#endif /* CONFIG_MBO */
269#ifdef CONFIG_FILS
270	if ((!(hapd->conf->wpa & WPA_PROTO_RSN) ||
271	     !wpa_key_mgmt_fils(hapd->conf->wpa_key_mgmt)) && len < 10)
272		len = 10;
273#endif /* CONFIG_FILS */
274	if (len < hapd->iface->extended_capa_len)
275		len = hapd->iface->extended_capa_len;
276	if (len == 0)
277		return eid;
278
279	*pos++ = WLAN_EID_EXT_CAPAB;
280	*pos++ = len;
281	for (i = 0; i < len; i++, pos++) {
282		hostapd_ext_capab_byte(hapd, pos, i);
283
284		if (i < hapd->iface->extended_capa_len) {
285			*pos &= ~hapd->iface->extended_capa_mask[i];
286			*pos |= hapd->iface->extended_capa[i];
287		}
288	}
289
290	while (len > 0 && eid[1 + len] == 0) {
291		len--;
292		eid[1] = len;
293	}
294	if (len == 0)
295		return eid;
296
297	return eid + 2 + len;
298}
299
300
301u8 * hostapd_eid_qos_map_set(struct hostapd_data *hapd, u8 *eid)
302{
303	u8 *pos = eid;
304	u8 len = hapd->conf->qos_map_set_len;
305
306	if (!len)
307		return eid;
308
309	*pos++ = WLAN_EID_QOS_MAP_SET;
310	*pos++ = len;
311	os_memcpy(pos, hapd->conf->qos_map_set, len);
312	pos += len;
313
314	return pos;
315}
316
317
318u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
319{
320	u8 *pos = eid;
321#ifdef CONFIG_INTERWORKING
322	u8 *len;
323
324	if (!hapd->conf->interworking)
325		return eid;
326
327	*pos++ = WLAN_EID_INTERWORKING;
328	len = pos++;
329
330	*pos = hapd->conf->access_network_type;
331	if (hapd->conf->internet)
332		*pos |= INTERWORKING_ANO_INTERNET;
333	if (hapd->conf->asra)
334		*pos |= INTERWORKING_ANO_ASRA;
335	if (hapd->conf->esr)
336		*pos |= INTERWORKING_ANO_ESR;
337	if (hapd->conf->uesa)
338		*pos |= INTERWORKING_ANO_UESA;
339	pos++;
340
341	if (hapd->conf->venue_info_set) {
342		*pos++ = hapd->conf->venue_group;
343		*pos++ = hapd->conf->venue_type;
344	}
345
346	if (!is_zero_ether_addr(hapd->conf->hessid)) {
347		os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
348		pos += ETH_ALEN;
349	}
350
351	*len = pos - len - 1;
352#endif /* CONFIG_INTERWORKING */
353
354	return pos;
355}
356
357
358u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
359{
360	u8 *pos = eid;
361#ifdef CONFIG_INTERWORKING
362
363	/* TODO: Separate configuration for ANQP? */
364	if (!hapd->conf->interworking)
365		return eid;
366
367	*pos++ = WLAN_EID_ADV_PROTO;
368	*pos++ = 2;
369	*pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
370	*pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
371#endif /* CONFIG_INTERWORKING */
372
373	return pos;
374}
375
376
377u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
378{
379	u8 *pos = eid;
380#ifdef CONFIG_INTERWORKING
381	u8 *len;
382	unsigned int i, count;
383
384	if (!hapd->conf->interworking ||
385	    hapd->conf->roaming_consortium == NULL ||
386	    hapd->conf->roaming_consortium_count == 0)
387		return eid;
388
389	*pos++ = WLAN_EID_ROAMING_CONSORTIUM;
390	len = pos++;
391
392	/* Number of ANQP OIs (in addition to the max 3 listed here) */
393	if (hapd->conf->roaming_consortium_count > 3 + 255)
394		*pos++ = 255;
395	else if (hapd->conf->roaming_consortium_count > 3)
396		*pos++ = hapd->conf->roaming_consortium_count - 3;
397	else
398		*pos++ = 0;
399
400	/* OU #1 and #2 Lengths */
401	*pos = hapd->conf->roaming_consortium[0].len;
402	if (hapd->conf->roaming_consortium_count > 1)
403		*pos |= hapd->conf->roaming_consortium[1].len << 4;
404	pos++;
405
406	if (hapd->conf->roaming_consortium_count > 3)
407		count = 3;
408	else
409		count = hapd->conf->roaming_consortium_count;
410
411	for (i = 0; i < count; i++) {
412		os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
413			  hapd->conf->roaming_consortium[i].len);
414		pos += hapd->conf->roaming_consortium[i].len;
415	}
416
417	*len = pos - len - 1;
418#endif /* CONFIG_INTERWORKING */
419
420	return pos;
421}
422
423
424u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
425{
426	if (hapd->conf->time_advertisement != 2)
427		return eid;
428
429	if (hapd->time_adv == NULL &&
430	    hostapd_update_time_adv(hapd) < 0)
431		return eid;
432
433	if (hapd->time_adv == NULL)
434		return eid;
435
436	os_memcpy(eid, wpabuf_head(hapd->time_adv),
437		  wpabuf_len(hapd->time_adv));
438	eid += wpabuf_len(hapd->time_adv);
439
440	return eid;
441}
442
443
444u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
445{
446	size_t len;
447
448	if (hapd->conf->time_advertisement != 2)
449		return eid;
450
451	len = os_strlen(hapd->conf->time_zone);
452
453	*eid++ = WLAN_EID_TIME_ZONE;
454	*eid++ = len;
455	os_memcpy(eid, hapd->conf->time_zone, len);
456	eid += len;
457
458	return eid;
459}
460
461
462int hostapd_update_time_adv(struct hostapd_data *hapd)
463{
464	const int elen = 2 + 1 + 10 + 5 + 1;
465	struct os_time t;
466	struct os_tm tm;
467	u8 *pos;
468
469	if (hapd->conf->time_advertisement != 2)
470		return 0;
471
472	if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
473		return -1;
474
475	if (!hapd->time_adv) {
476		hapd->time_adv = wpabuf_alloc(elen);
477		if (hapd->time_adv == NULL)
478			return -1;
479		pos = wpabuf_put(hapd->time_adv, elen);
480	} else
481		pos = wpabuf_mhead_u8(hapd->time_adv);
482
483	*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
484	*pos++ = 1 + 10 + 5 + 1;
485
486	*pos++ = 2; /* UTC time at which the TSF timer is 0 */
487
488	/* Time Value at TSF 0 */
489	/* FIX: need to calculate this based on the current TSF value */
490	WPA_PUT_LE16(pos, tm.year); /* Year */
491	pos += 2;
492	*pos++ = tm.month; /* Month */
493	*pos++ = tm.day; /* Day of month */
494	*pos++ = tm.hour; /* Hours */
495	*pos++ = tm.min; /* Minutes */
496	*pos++ = tm.sec; /* Seconds */
497	WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
498	pos += 2;
499	*pos++ = 0; /* Reserved */
500
501	/* Time Error */
502	/* TODO: fill in an estimate on the error */
503	*pos++ = 0;
504	*pos++ = 0;
505	*pos++ = 0;
506	*pos++ = 0;
507	*pos++ = 0;
508
509	*pos++ = hapd->time_update_counter++;
510
511	return 0;
512}
513
514
515u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
516{
517	u8 *pos = eid;
518
519#ifdef CONFIG_WNM
520	if (hapd->conf->ap_max_inactivity > 0) {
521		unsigned int val;
522		*pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
523		*pos++ = 3;
524		val = hapd->conf->ap_max_inactivity;
525		if (val > 68000)
526			val = 68000;
527		val *= 1000;
528		val /= 1024;
529		if (val == 0)
530			val = 1;
531		if (val > 65535)
532			val = 65535;
533		WPA_PUT_LE16(pos, val);
534		pos += 2;
535		*pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
536	}
537#endif /* CONFIG_WNM */
538
539	return pos;
540}
541
542
543#ifdef CONFIG_MBO
544
545u8 * hostapd_eid_mbo(struct hostapd_data *hapd, u8 *eid, size_t len)
546{
547	u8 mbo[6], *mbo_pos = mbo;
548	u8 *pos = eid;
549
550	if (!hapd->conf->mbo_enabled)
551		return eid;
552
553	*mbo_pos++ = MBO_ATTR_ID_AP_CAPA_IND;
554	*mbo_pos++ = 1;
555	/* Not Cellular aware */
556	*mbo_pos++ = 0;
557
558	if (hapd->mbo_assoc_disallow) {
559		*mbo_pos++ = MBO_ATTR_ID_ASSOC_DISALLOW;
560		*mbo_pos++ = 1;
561		*mbo_pos++ = hapd->mbo_assoc_disallow;
562	}
563
564	pos += mbo_add_ie(pos, len, mbo, mbo_pos - mbo);
565
566	return pos;
567}
568
569
570u8 hostapd_mbo_ie_len(struct hostapd_data *hapd)
571{
572	if (!hapd->conf->mbo_enabled)
573		return 0;
574
575	/*
576	 * MBO IE header (6) + Capability Indication attribute (3) +
577	 * Association Disallowed attribute (3) = 12
578	 */
579	return 6 + 3 + (hapd->mbo_assoc_disallow ? 3 : 0);
580}
581
582#endif /* CONFIG_MBO */
583
584
585void ap_copy_sta_supp_op_classes(struct sta_info *sta,
586				 const u8 *supp_op_classes,
587				 size_t supp_op_classes_len)
588{
589	if (!supp_op_classes)
590		return;
591	os_free(sta->supp_op_classes);
592	sta->supp_op_classes = os_malloc(1 + supp_op_classes_len);
593	if (!sta->supp_op_classes)
594		return;
595
596	sta->supp_op_classes[0] = supp_op_classes_len;
597	os_memcpy(sta->supp_op_classes + 1, supp_op_classes,
598		  supp_op_classes_len);
599}
600
601
602u8 * hostapd_eid_fils_indic(struct hostapd_data *hapd, u8 *eid, int hessid)
603{
604	u8 *pos = eid;
605#ifdef CONFIG_FILS
606	u8 *len;
607	u16 fils_info = 0;
608	size_t realms;
609	struct fils_realm *realm;
610
611	if (!(hapd->conf->wpa & WPA_PROTO_RSN) ||
612	    !wpa_key_mgmt_fils(hapd->conf->wpa_key_mgmt))
613		return pos;
614
615	realms = dl_list_len(&hapd->conf->fils_realms);
616	if (realms > 7)
617		realms = 7; /* 3 bit count field limits this to max 7 */
618
619	*pos++ = WLAN_EID_FILS_INDICATION;
620	len = pos++;
621	/* TODO: B0..B2: Number of Public Key Identifiers */
622	if (hapd->conf->erp_domain) {
623		/* B3..B5: Number of Realm Identifiers */
624		fils_info |= realms << 3;
625	}
626	/* TODO: B6: FILS IP Address Configuration */
627	if (hapd->conf->fils_cache_id_set)
628		fils_info |= BIT(7);
629	if (hessid && !is_zero_ether_addr(hapd->conf->hessid))
630		fils_info |= BIT(8); /* HESSID Included */
631	/* FILS Shared Key Authentication without PFS Supported */
632	fils_info |= BIT(9);
633	/* TODO: B10: FILS Shared Key Authentication with PFS Supported */
634	/* TODO: B11: FILS Public Key Authentication Supported */
635	/* B12..B15: Reserved */
636	WPA_PUT_LE16(pos, fils_info);
637	pos += 2;
638	if (hapd->conf->fils_cache_id_set) {
639		os_memcpy(pos, hapd->conf->fils_cache_id, FILS_CACHE_ID_LEN);
640		pos += FILS_CACHE_ID_LEN;
641	}
642	if (hessid && !is_zero_ether_addr(hapd->conf->hessid)) {
643		os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
644		pos += ETH_ALEN;
645	}
646
647	dl_list_for_each(realm, &hapd->conf->fils_realms, struct fils_realm,
648			 list) {
649		if (realms == 0)
650			break;
651		realms--;
652		os_memcpy(pos, realm->hash, 2);
653		pos += 2;
654	}
655	*len = pos - len - 1;
656#endif /* CONFIG_FILS */
657
658	return pos;
659}
660