ieee802_11_shared.c revision b36ed7cd946148d829f311de8fe53ea3ffaaffe3
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		break;
176	case 1: /* Bits 8-15 */
177		break;
178	case 2: /* Bits 16-23 */
179		if (hapd->conf->wnm_sleep_mode)
180			*pos |= 0x02; /* Bit 17 - WNM-Sleep Mode */
181		if (hapd->conf->bss_transition)
182			*pos |= 0x08; /* Bit 19 - BSS Transition */
183		break;
184	case 3: /* Bits 24-31 */
185#ifdef CONFIG_WNM
186		*pos |= 0x02; /* Bit 25 - SSID List */
187#endif /* CONFIG_WNM */
188		if (hapd->conf->time_advertisement == 2)
189			*pos |= 0x08; /* Bit 27 - UTC TSF Offset */
190		if (hapd->conf->interworking)
191			*pos |= 0x80; /* Bit 31 - Interworking */
192		break;
193	case 4: /* Bits 32-39 */
194		if (hapd->conf->qos_map_set_len)
195			*pos |= 0x01; /* Bit 32 - QoS Map */
196		if (hapd->conf->tdls & TDLS_PROHIBIT)
197			*pos |= 0x40; /* Bit 38 - TDLS Prohibited */
198		if (hapd->conf->tdls & TDLS_PROHIBIT_CHAN_SWITCH) {
199			/* Bit 39 - TDLS Channel Switching Prohibited */
200			*pos |= 0x80;
201		}
202		break;
203	case 5: /* Bits 40-47 */
204#ifdef CONFIG_HS20
205		if (hapd->conf->hs20)
206			*pos |= 0x40; /* Bit 46 - WNM-Notification */
207#endif /* CONFIG_HS20 */
208		break;
209	case 6: /* Bits 48-55 */
210		if (hapd->conf->ssid.utf8_ssid)
211			*pos |= 0x01; /* Bit 48 - UTF-8 SSID */
212		break;
213	}
214}
215
216
217u8 * hostapd_eid_ext_capab(struct hostapd_data *hapd, u8 *eid)
218{
219	u8 *pos = eid;
220	u8 len = 0, i;
221
222	if (hapd->conf->tdls & (TDLS_PROHIBIT | TDLS_PROHIBIT_CHAN_SWITCH))
223		len = 5;
224	if (len < 4 && hapd->conf->interworking)
225		len = 4;
226	if (len < 3 && hapd->conf->wnm_sleep_mode)
227		len = 3;
228	if (len < 1 && hapd->iconf->obss_interval)
229		len = 1;
230	if (len < 7 && hapd->conf->ssid.utf8_ssid)
231		len = 7;
232#ifdef CONFIG_WNM
233	if (len < 4)
234		len = 4;
235#endif /* CONFIG_WNM */
236#ifdef CONFIG_HS20
237	if (hapd->conf->hs20 && len < 6)
238		len = 6;
239#endif /* CONFIG_HS20 */
240	if (len < hapd->iface->extended_capa_len)
241		len = hapd->iface->extended_capa_len;
242	if (len == 0)
243		return eid;
244
245	*pos++ = WLAN_EID_EXT_CAPAB;
246	*pos++ = len;
247	for (i = 0; i < len; i++, pos++) {
248		hostapd_ext_capab_byte(hapd, pos, i);
249
250		if (i < hapd->iface->extended_capa_len) {
251			*pos &= ~hapd->iface->extended_capa_mask[i];
252			*pos |= hapd->iface->extended_capa[i];
253		}
254	}
255
256	while (len > 0 && eid[1 + len] == 0) {
257		len--;
258		eid[1] = len;
259	}
260	if (len == 0)
261		return eid;
262
263	return eid + 2 + len;
264}
265
266
267u8 * hostapd_eid_qos_map_set(struct hostapd_data *hapd, u8 *eid)
268{
269	u8 *pos = eid;
270	u8 len = hapd->conf->qos_map_set_len;
271
272	if (!len)
273		return eid;
274
275	*pos++ = WLAN_EID_QOS_MAP_SET;
276	*pos++ = len;
277	os_memcpy(pos, hapd->conf->qos_map_set, len);
278	pos += len;
279
280	return pos;
281}
282
283
284u8 * hostapd_eid_interworking(struct hostapd_data *hapd, u8 *eid)
285{
286	u8 *pos = eid;
287#ifdef CONFIG_INTERWORKING
288	u8 *len;
289
290	if (!hapd->conf->interworking)
291		return eid;
292
293	*pos++ = WLAN_EID_INTERWORKING;
294	len = pos++;
295
296	*pos = hapd->conf->access_network_type;
297	if (hapd->conf->internet)
298		*pos |= INTERWORKING_ANO_INTERNET;
299	if (hapd->conf->asra)
300		*pos |= INTERWORKING_ANO_ASRA;
301	if (hapd->conf->esr)
302		*pos |= INTERWORKING_ANO_ESR;
303	if (hapd->conf->uesa)
304		*pos |= INTERWORKING_ANO_UESA;
305	pos++;
306
307	if (hapd->conf->venue_info_set) {
308		*pos++ = hapd->conf->venue_group;
309		*pos++ = hapd->conf->venue_type;
310	}
311
312	if (!is_zero_ether_addr(hapd->conf->hessid)) {
313		os_memcpy(pos, hapd->conf->hessid, ETH_ALEN);
314		pos += ETH_ALEN;
315	}
316
317	*len = pos - len - 1;
318#endif /* CONFIG_INTERWORKING */
319
320	return pos;
321}
322
323
324u8 * hostapd_eid_adv_proto(struct hostapd_data *hapd, u8 *eid)
325{
326	u8 *pos = eid;
327#ifdef CONFIG_INTERWORKING
328
329	/* TODO: Separate configuration for ANQP? */
330	if (!hapd->conf->interworking)
331		return eid;
332
333	*pos++ = WLAN_EID_ADV_PROTO;
334	*pos++ = 2;
335	*pos++ = 0x7F; /* Query Response Length Limit | PAME-BI */
336	*pos++ = ACCESS_NETWORK_QUERY_PROTOCOL;
337#endif /* CONFIG_INTERWORKING */
338
339	return pos;
340}
341
342
343u8 * hostapd_eid_roaming_consortium(struct hostapd_data *hapd, u8 *eid)
344{
345	u8 *pos = eid;
346#ifdef CONFIG_INTERWORKING
347	u8 *len;
348	unsigned int i, count;
349
350	if (!hapd->conf->interworking ||
351	    hapd->conf->roaming_consortium == NULL ||
352	    hapd->conf->roaming_consortium_count == 0)
353		return eid;
354
355	*pos++ = WLAN_EID_ROAMING_CONSORTIUM;
356	len = pos++;
357
358	/* Number of ANQP OIs (in addition to the max 3 listed here) */
359	if (hapd->conf->roaming_consortium_count > 3 + 255)
360		*pos++ = 255;
361	else if (hapd->conf->roaming_consortium_count > 3)
362		*pos++ = hapd->conf->roaming_consortium_count - 3;
363	else
364		*pos++ = 0;
365
366	/* OU #1 and #2 Lengths */
367	*pos = hapd->conf->roaming_consortium[0].len;
368	if (hapd->conf->roaming_consortium_count > 1)
369		*pos |= hapd->conf->roaming_consortium[1].len << 4;
370	pos++;
371
372	if (hapd->conf->roaming_consortium_count > 3)
373		count = 3;
374	else
375		count = hapd->conf->roaming_consortium_count;
376
377	for (i = 0; i < count; i++) {
378		os_memcpy(pos, hapd->conf->roaming_consortium[i].oi,
379			  hapd->conf->roaming_consortium[i].len);
380		pos += hapd->conf->roaming_consortium[i].len;
381	}
382
383	*len = pos - len - 1;
384#endif /* CONFIG_INTERWORKING */
385
386	return pos;
387}
388
389
390u8 * hostapd_eid_time_adv(struct hostapd_data *hapd, u8 *eid)
391{
392	if (hapd->conf->time_advertisement != 2)
393		return eid;
394
395	if (hapd->time_adv == NULL &&
396	    hostapd_update_time_adv(hapd) < 0)
397		return eid;
398
399	if (hapd->time_adv == NULL)
400		return eid;
401
402	os_memcpy(eid, wpabuf_head(hapd->time_adv),
403		  wpabuf_len(hapd->time_adv));
404	eid += wpabuf_len(hapd->time_adv);
405
406	return eid;
407}
408
409
410u8 * hostapd_eid_time_zone(struct hostapd_data *hapd, u8 *eid)
411{
412	size_t len;
413
414	if (hapd->conf->time_advertisement != 2)
415		return eid;
416
417	len = os_strlen(hapd->conf->time_zone);
418
419	*eid++ = WLAN_EID_TIME_ZONE;
420	*eid++ = len;
421	os_memcpy(eid, hapd->conf->time_zone, len);
422	eid += len;
423
424	return eid;
425}
426
427
428int hostapd_update_time_adv(struct hostapd_data *hapd)
429{
430	const int elen = 2 + 1 + 10 + 5 + 1;
431	struct os_time t;
432	struct os_tm tm;
433	u8 *pos;
434
435	if (hapd->conf->time_advertisement != 2)
436		return 0;
437
438	if (os_get_time(&t) < 0 || os_gmtime(t.sec, &tm) < 0)
439		return -1;
440
441	if (!hapd->time_adv) {
442		hapd->time_adv = wpabuf_alloc(elen);
443		if (hapd->time_adv == NULL)
444			return -1;
445		pos = wpabuf_put(hapd->time_adv, elen);
446	} else
447		pos = wpabuf_mhead_u8(hapd->time_adv);
448
449	*pos++ = WLAN_EID_TIME_ADVERTISEMENT;
450	*pos++ = 1 + 10 + 5 + 1;
451
452	*pos++ = 2; /* UTC time at which the TSF timer is 0 */
453
454	/* Time Value at TSF 0 */
455	/* FIX: need to calculate this based on the current TSF value */
456	WPA_PUT_LE16(pos, tm.year); /* Year */
457	pos += 2;
458	*pos++ = tm.month; /* Month */
459	*pos++ = tm.day; /* Day of month */
460	*pos++ = tm.hour; /* Hours */
461	*pos++ = tm.min; /* Minutes */
462	*pos++ = tm.sec; /* Seconds */
463	WPA_PUT_LE16(pos, 0); /* Milliseconds (not used) */
464	pos += 2;
465	*pos++ = 0; /* Reserved */
466
467	/* Time Error */
468	/* TODO: fill in an estimate on the error */
469	*pos++ = 0;
470	*pos++ = 0;
471	*pos++ = 0;
472	*pos++ = 0;
473	*pos++ = 0;
474
475	*pos++ = hapd->time_update_counter++;
476
477	return 0;
478}
479
480
481u8 * hostapd_eid_bss_max_idle_period(struct hostapd_data *hapd, u8 *eid)
482{
483	u8 *pos = eid;
484
485#ifdef CONFIG_WNM
486	if (hapd->conf->ap_max_inactivity > 0) {
487		unsigned int val;
488		*pos++ = WLAN_EID_BSS_MAX_IDLE_PERIOD;
489		*pos++ = 3;
490		val = hapd->conf->ap_max_inactivity;
491		if (val > 68000)
492			val = 68000;
493		val *= 1000;
494		val /= 1024;
495		if (val == 0)
496			val = 1;
497		if (val > 65535)
498			val = 65535;
499		WPA_PUT_LE16(pos, val);
500		pos += 2;
501		*pos++ = 0x00; /* TODO: Protected Keep-Alive Required */
502	}
503#endif /* CONFIG_WNM */
504
505	return pos;
506}
507