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_time now, passed;
28
29	*pos++ = WLAN_EID_TIMEOUT_INTERVAL;
30	*pos++ = 5;
31	*pos++ = WLAN_TIMEOUT_ASSOC_COMEBACK;
32	os_get_time(&now);
33	os_time_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		perror("ieee802_11_send_sa_query_req: send");
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		perror("ieee80211_mgmt_sa_query_request: send");
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		break;
174	case 1: /* Bits 8-15 */
175		break;
176	case 2: /* Bits 16-23 */
177		if (hapd->conf->wnm_sleep_mode)
178			*pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
179		if (hapd->conf->bss_transition)
180			*pos |= 0x08; /* Bit 19 - BSS Transition */
181		break;
182	case 3: /* Bits 24-31 */
183#ifdef CONFIG_WNM
184		*pos |= 0x02; /* Bit 25 - SSID List */
185#endif /* CONFIG_WNM */
186		if (hapd->conf->time_advertisement == 2)
187			*pos |= 0x08; /* Bit 27 - UTC TSF Offset */
188		if (hapd->conf->interworking)
189			*pos |= 0x80; /* Bit 31 - Interworking */
190		break;
191	case 4: /* Bits 32-39 */
192		if (hapd->conf->tdls & TDLS_PROHIBIT)
193			*pos |= 0x40; /* Bit 38 - TDLS Prohibited */
194		if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH) {
195			/* Bit 39 - TDLS Channel Switching Prohibited */
196			*pos |= 0x80;
197		}
198		break;
199	case 5: /* Bits 40-47 */
200		break;
201	case 6: /* Bits 48-55 */
202		if (hapd->conf->ssid.utf8_ssid)
203			*pos |= 0x01; /* Bit 48 - UTF-8 SSID */
204		break;
205	}
206}
207
208
209u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
210{
211	u8 *pos = eid;
212	u8 len = 0, i;
213
214	if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
215		len = 5;
216	if (len < 4 && hapd->conf->interworking)
217		len = 4;
218	if (len < 3 && hapd->conf->wnm_sleep_mode)
219		len = 3;
220	if (len < 7 && hapd->conf->ssid.utf8_ssid)
221		len = 7;
222#ifdef CONFIG_WNM
223	if (len < 4)
224		len = 4;
225#endif /* CONFIG_WNM */
226	if (len < hapd->iface->extended_capa_len)
227		len = hapd->iface->extended_capa_len;
228	if (len == 0)
229		return eid;
230
231	*pos++ = WLAN_EID_EXT_CAPAB;
232	*pos++ = len;
233	for (i = 0; i < len; i++, pos++) {
234		hostapd_ext_capab_byte(hapd, pos, i);
235
236		if (i < hapd->iface->extended_capa_len) {
237			*pos &= ~hapd->iface->extended_capa_mask[i];
238			*pos |= hapd->iface->extended_capa[i];
239		}
240	}
241
242	while (len > 0 && eid[1 + len] == 0) {
243		len--;
244		eid[1] = len;
245	}
246	if (len == 0)
247		return eid;
248
249	return eid + 2 + len;
250}
251
252
253u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
254{
255	u8 *pos = eid;
256#ifdef CONFIG_INTERWORKING
257	u8 *len;
258
259	if (!hapd->conf->interworking)
260		return eid;
261
262	*pos++ = WLAN_EID_INTERWORKING;
263	len = pos++;
264
265	*pos = hapd->conf->access_network_type;
266	if (hapd->conf->internet)
267		*pos |= INTERWORKING_ANO_INTERNET;
268	if (hapd->conf->asra)
269		*pos |= INTERWORKING_ANO_ASRA;
270	if (hapd->conf->esr)
271		*pos |= INTERWORKING_ANO_ESR;
272	if (hapd->conf->uesa)
273		*pos |= INTERWORKING_ANO_UESA;
274	pos++;
275
276	if (hapd->conf->venue_info_set) {
277		*pos++ = hapd->conf->venue_group;
278		*pos++ = hapd->conf->venue_type;
279	}
280
281	if (!is_zero_ether_addr(hapd->conf->hessid)) {
282		os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
283		pos += ETH_ALEN;
284	}
285
286	*len = pos - len - 1;
287#endif /* CONFIG_INTERWORKING */
288
289	return pos;
290}
291
292
293u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
294{
295	u8 *pos = eid;
296#ifdef CONFIG_INTERWORKING
297
298	/* TODO: Separate configuration for ANQP? */
299	if (!hapd->conf->interworking)
300		return eid;
301
302	*pos++ = WLAN_EID_ADV_PROTO;
303	*pos++ = 2;
304	*pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
305	*pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
306#endif /* CONFIG_INTERWORKING */
307
308	return pos;
309}
310
311
312u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
313{
314	u8 *pos = eid;
315#ifdef CONFIG_INTERWORKING
316	u8 *len;
317	unsigned int i, count;
318
319	if (!hapd->conf->interworking ||
320	    hapd->conf->roaming_consortium == NULL ||
321	    hapd->conf->roaming_consortium_count == 0)
322		return eid;
323
324	*pos++ = WLAN_EID_ROAMING_CONSORTIUM;
325	len = pos++;
326
327	/* Number of ANQP OIs (in addition to the max 3 listed here) */
328	if (hapd->conf->roaming_consortium_count > 3 + 255)
329		*pos++ = 255;
330	else if (hapd->conf->roaming_consortium_count > 3)
331		*pos++ = hapd->conf->roaming_consortium_count - 3;
332	else
333		*pos++ = 0;
334
335	/* OU #1 and #2 Lengths */
336	*pos = hapd->conf->roaming_consortium[0].len;
337	if (hapd->conf->roaming_consortium_count > 1)
338		*pos |= hapd->conf->roaming_consortium[1].len << 4;
339	pos++;
340
341	if (hapd->conf->roaming_consortium_count > 3)
342		count = 3;
343	else
344		count = hapd->conf->roaming_consortium_count;
345
346	for (i = 0; i < count; i++) {
347		os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
348			  hapd->conf->roaming_consortium[i].len);
349		pos += hapd->conf->roaming_consortium[i].len;
350	}
351
352	*len = pos - len - 1;
353#endif /* CONFIG_INTERWORKING */
354
355	return pos;
356}
357
358
359u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
360{
361	if (hapd->conf->time_advertisement != 2)
362		return eid;
363
364	if (hapd->time_adv == NULL &&
365	    hostapd_update_time_adv(hapd) < 0)
366		return eid;
367
368	if (hapd->time_adv == NULL)
369		return eid;
370
371	os_memcpy(eid, wpabuf_head(hapd->time_adv),
372		  wpabuf_len(hapd->time_adv));
373	eid += wpabuf_len(hapd->time_adv);
374
375	return eid;
376}
377
378
379u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
380{
381	size_t len;
382
383	if (hapd->conf->time_advertisement != 2)
384		return eid;
385
386	len = os_strlen(hapd->conf->time_zone);
387
388	*eid++ = WLAN_EID_TIME_ZONE;
389	*eid++ = len;
390	os_memcpy(eid, hapd->conf->time_zone, len);
391	eid += len;
392
393	return eid;
394}
395
396
397int hostapd_update_time_adv(struct hostapd_data *hapd)
398{
399	const int elen = 2 + 1 + 10 + 5 + 1;
400	struct os_time t;
401	struct os_tm tm;
402	u8 *pos;
403
404	if (hapd->conf->time_advertisement != 2)
405		return 0;
406
407	if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
408		return -1;
409
410	if (!hapd->time_adv) {
411		hapd->time_adv = wpabuf_alloc(elen);
412		if (hapd->time_adv == NULL)
413			return -1;
414		pos = wpabuf_put(hapd->time_adv, elen);
415	} else
416		pos = wpabuf_mhead_u8(hapd->time_adv);
417
418	*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
419	*pos++ = 1 + 10 + 5 + 1;
420
421	*pos++ = 2; /* UTC time at which the TSF timer is 0 */
422
423	/* Time Value at TSF 0 */
424	/* FIX: need to calculate this based on the current TSF value */
425	WPA_PUT_LE16(pos, tm.year); /* Year */
426	pos += 2;
427	*pos++ = tm.month; /* Month */
428	*pos++ = tm.day; /* Day of month */
429	*pos++ = tm.hour; /* Hours */
430	*pos++ = tm.min; /* Minutes */
431	*pos++ = tm.sec; /* Seconds */
432	WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
433	pos += 2;
434	*pos++ = 0; /* Reserved */
435
436	/* Time Error */
437	/* TODO: fill in an estimate on the error */
438	*pos++ = 0;
439	*pos++ = 0;
440	*pos++ = 0;
441	*pos++ = 0;
442	*pos++ = 0;
443
444	*pos++ = hapd->time_update_counter++;
445
446	return 0;
447}
448
449
450u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
451{
452	u8 *pos = eid;
453
454#ifdef CONFIG_WNM
455	if (hapd->conf->ap_max_inactivity > 0) {
456		unsigned int val;
457		*pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
458		*pos++ = 3;
459		val = hapd->conf->ap_max_inactivity;
460		if (val > 68000)
461			val = 68000;
462		val *= 1000;
463		val /= 1024;
464		if (val == 0)
465			val = 1;
466		if (val > 65535)
467			val = 65535;
468		WPA_PUT_LE16(pos, val);
469		pos += 2;
470		*pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
471	}
472#endif /* CONFIG_WNM */
473
474	return pos;
475}
476