[thirdparty/hostap.git] / hostapd / beacon.c

/*
 * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
 * Copyright (c) 2002-2004, Instant802 Networks, Inc.
 * Copyright (c) 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#ifndef CONFIG_NATIVE_WINDOWS

#include "hostapd.h"
#include "ieee802_11.h"
#include "wpa.h"
#include "wme.h"
#include "beacon.h"
#include "hw_features.h"
#include "driver.h"
#include "sta_info.h"
#include "ieee802_11h.h"


static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
{
	u8 erp = 0;

	if (hapd->iface->current_mode == NULL ||
	    hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
		return 0;

	switch (hapd->iconf->cts_protection_type) {
	case CTS_PROTECTION_FORCE_ENABLED:
		erp |= ERP_INFO_NON_ERP_PRESENT | ERP_INFO_USE_PROTECTION;
		break;
	case CTS_PROTECTION_FORCE_DISABLED:
		erp = 0;
		break;
	case CTS_PROTECTION_AUTOMATIC:
		if (hapd->iface->olbc)
			erp |= ERP_INFO_USE_PROTECTION;
		/* continue */
	case CTS_PROTECTION_AUTOMATIC_NO_OLBC:
		if (hapd->iface->num_sta_non_erp > 0) {
			erp |= ERP_INFO_NON_ERP_PRESENT |
				ERP_INFO_USE_PROTECTION;
		}
		break;
	}
	if (hapd->iface->num_sta_no_short_preamble > 0)
		erp |= ERP_INFO_BARKER_PREAMBLE_MODE;

	return erp;
}


static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
{
	*eid++ = WLAN_EID_DS_PARAMS;
	*eid++ = 1;
	*eid++ = hapd->iconf->channel;
	return eid;
}


static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
{
	if (hapd->iface->current_mode == NULL ||
	    hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
		return eid;

	/* Set NonERP_present and use_protection bits if there
	 * are any associated NonERP stations. */
	/* TODO: use_protection bit can be set to zero even if
	 * there are NonERP stations present. This optimization
	 * might be useful if NonERP stations are "quiet".
	 * See 802.11g/D6 E-1 for recommended practice.
	 * In addition, Non ERP present might be set, if AP detects Non ERP
	 * operation on other APs. */

	/* Add ERP Information element */
	*eid++ = WLAN_EID_ERP_INFO;
	*eid++ = 1;
	*eid++ = ieee802_11_erp_info(hapd);

	return eid;
}


static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
				int max_len)
{
	u8 *pos = eid;

	if ((!hapd->iconf->ieee80211d && !hapd->iface->dfs_enable) ||
	    max_len < 6)
		return eid;

	*pos++ = WLAN_EID_COUNTRY;
	pos++; /* length will be set later */
	os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
	pos += 3;

	if ((pos - eid) & 1)
		*pos++ = 0; /* pad for 16-bit alignment */

	eid[1] = (pos - eid) - 2;

	return pos;
}


static u8 * hostapd_eid_power_constraint(struct hostapd_data *hapd, u8 *eid)

{
	if (!hapd->iface->dfs_enable)
		return eid;
	*eid++ = WLAN_EID_PWR_CONSTRAINT;
	*eid++ = 1;
	*eid++ = hapd->iface->pwr_const;
	return eid;
}


static u8 * hostapd_eid_tpc_report(struct hostapd_data *hapd, u8 *eid)

{
	if (!hapd->iface->dfs_enable)
		return eid;
	*eid++ = WLAN_EID_TPC_REPORT;
	*eid++ = 2;
	*eid++ = hapd->iface->tx_power; /* TX POWER */
	*eid++ = 0; /* Link Margin */
	return eid;
}

static u8 * hostapd_eid_channel_switch(struct hostapd_data *hapd, u8 *eid)

{
	if (!hapd->iface->dfs_enable || !hapd->iface->channel_switch)
		return eid;
	*eid++ = WLAN_EID_CHANNEL_SWITCH;
	*eid++ = 3;
	*eid++ = CHAN_SWITCH_MODE_QUIET;
	*eid++ = hapd->iface->channel_switch; /* New channel */
	/* 0 - very soon; 1 - before next TBTT; num - after num beacons */
	*eid++ = 0;
	return eid;
}


static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len,
			    struct sta_info *sta)
{
	const u8 *ie;
	size_t ielen;

	ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
	if (ie == NULL || ielen > len)
		return eid;

	os_memcpy(eid, ie, ielen);
	return eid + ielen;
}


void handle_probe_req(struct hostapd_data *hapd, struct ieee80211_mgmt *mgmt,
		      size_t len)
{
	struct ieee80211_mgmt *resp;
	struct ieee802_11_elems elems;
	char *ssid;
	u8 *pos, *epos, *ie;
	size_t ssid_len, ie_len;
	struct sta_info *sta = NULL;

	ie = mgmt->u.probe_req.variable;
	ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));

	if (!hapd->iconf->send_probe_response)
		return;

	if (ieee802_11_parse_elems(hapd, ie, ie_len, &elems, 0) == ParseFailed)
	{
		wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
			   MAC2STR(mgmt->sa));
		return;
	}

	ssid = NULL;
	ssid_len = 0;

	if ((!elems.ssid || !elems.supp_rates)) {
		wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
			   "without SSID or supported rates element",
			   MAC2STR(mgmt->sa));
		return;
	}

	if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0) {
		wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
			   "broadcast SSID ignored", MAC2STR(mgmt->sa));
		return;
	}

	sta = ap_get_sta(hapd, mgmt->sa);

	if (elems.ssid_len == 0 ||
	    (elems.ssid_len == hapd->conf->ssid.ssid_len &&
	     os_memcmp(elems.ssid, hapd->conf->ssid.ssid, elems.ssid_len) ==
	     0)) {
		ssid = hapd->conf->ssid.ssid;
		ssid_len = hapd->conf->ssid.ssid_len;
		if (sta)
			sta->ssid_probe = &hapd->conf->ssid;
	}

	if (!ssid) {
		if (!(mgmt->da[0] & 0x01)) {
			char ssid_txt[33];
			ieee802_11_print_ssid(ssid_txt, elems.ssid,
					      elems.ssid_len);
			wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
				   " for foreign SSID '%s'",
				   MAC2STR(mgmt->sa), ssid_txt);
		}
		return;
	}

	/* TODO: verify that supp_rates contains at least one matching rate
	 * with AP configuration */
#define MAX_PROBERESP_LEN 768
	resp = os_zalloc(MAX_PROBERESP_LEN);
	if (resp == NULL)
		return;
	epos = ((u8 *) resp) + MAX_PROBERESP_LEN;

	resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					   WLAN_FC_STYPE_PROBE_RESP);
	os_memcpy(resp->da, mgmt->sa, ETH_ALEN);
	os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);

	os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
	resp->u.probe_resp.beacon_int =
		host_to_le16(hapd->iconf->beacon_int);

	/* hardware or low-level driver will setup seq_ctrl and timestamp */
	resp->u.probe_resp.capab_info =
		host_to_le16(hostapd_own_capab_info(hapd, sta, 1));

	pos = resp->u.probe_resp.variable;
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	os_memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	/* Supported rates */
	pos = hostapd_eid_supp_rates(hapd, pos);

	/* DS Params */
	pos = hostapd_eid_ds_params(hapd, pos);

	pos = hostapd_eid_country(hapd, pos, epos - pos);

	pos = hostapd_eid_power_constraint(hapd, pos);
	pos = hostapd_eid_tpc_report(hapd, pos);

	/* ERP Information element */
	pos = hostapd_eid_erp_info(hapd, pos);

	/* Extended supported rates */
	pos = hostapd_eid_ext_supp_rates(hapd, pos);

	pos = hostapd_eid_wpa(hapd, pos, epos - pos, sta);

	/* Wi-Fi Wireless Multimedia Extensions */
	if (hapd->conf->wme_enabled)
		pos = hostapd_eid_wme(hapd, pos);

	if (hostapd_send_mgmt_frame(hapd, resp, pos - (u8 *) resp, 0) < 0)
		perror("handle_probe_req: send");

	os_free(resp);

	wpa_printf(MSG_MSGDUMP, "STA " MACSTR " sent probe request for %s "
		   "SSID", MAC2STR(mgmt->sa),
		   elems.ssid_len == 0 ? "broadcast" : "our");
}


void ieee802_11_set_beacon(struct hostapd_data *hapd)
{
	struct ieee80211_mgmt *head;
	u8 *pos, *tail, *tailpos;
	int preamble;
	u16 capab_info;
	size_t head_len, tail_len;
	int cts_protection = ((ieee802_11_erp_info(hapd) &
			      ERP_INFO_USE_PROTECTION) ? 1 : 0);

#define BEACON_HEAD_BUF_SIZE 256
#define BEACON_TAIL_BUF_SIZE 512
	head = os_zalloc(BEACON_HEAD_BUF_SIZE);
	tailpos = tail = os_malloc(BEACON_TAIL_BUF_SIZE);
	if (head == NULL || tail == NULL) {
		wpa_printf(MSG_ERROR, "Failed to set beacon data");
		os_free(head);
		os_free(tail);
		return;
	}

	head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					   WLAN_FC_STYPE_BEACON);
	head->duration = host_to_le16(0);
	os_memset(head->da, 0xff, ETH_ALEN);

	os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
	os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
	head->u.beacon.beacon_int =
		host_to_le16(hapd->iconf->beacon_int);

	/* hardware or low-level driver will setup seq_ctrl and timestamp */
	capab_info = hostapd_own_capab_info(hapd, NULL, 0);
	head->u.beacon.capab_info = host_to_le16(capab_info);
	pos = &head->u.beacon.variable[0];

	/* SSID */
	*pos++ = WLAN_EID_SSID;
	if (hapd->conf->ignore_broadcast_ssid == 2) {
		/* clear the data, but keep the correct length of the SSID */
		*pos++ = hapd->conf->ssid.ssid_len;
		os_memset(pos, 0, hapd->conf->ssid.ssid_len);
		pos += hapd->conf->ssid.ssid_len;
	} else if (hapd->conf->ignore_broadcast_ssid) {
		*pos++ = 0; /* empty SSID */
	} else {
		*pos++ = hapd->conf->ssid.ssid_len;
		os_memcpy(pos, hapd->conf->ssid.ssid,
			  hapd->conf->ssid.ssid_len);
		pos += hapd->conf->ssid.ssid_len;
	}

	/* Supported rates */
	pos = hostapd_eid_supp_rates(hapd, pos);

	/* DS Params */
	pos = hostapd_eid_ds_params(hapd, pos);

	head_len = pos - (u8 *) head;

	tailpos = hostapd_eid_country(hapd, tailpos,
				      tail + BEACON_TAIL_BUF_SIZE - tailpos);

	tailpos = hostapd_eid_power_constraint(hapd, tailpos);
	tailpos = hostapd_eid_channel_switch(hapd, tailpos);
	tailpos = hostapd_eid_tpc_report(hapd, tailpos);

	/* ERP Information element */
	tailpos = hostapd_eid_erp_info(hapd, tailpos);

	/* Extended supported rates */
	tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);

	tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
				  tailpos, NULL);

	/* Wi-Fi Wireless Multimedia Extensions */
	if (hapd->conf->wme_enabled)
		tailpos = hostapd_eid_wme(hapd, tailpos);

	tail_len = tailpos > tail ? tailpos - tail : 0;

	if (hostapd_set_beacon(hapd->conf->iface, hapd, (u8 *) head, head_len,
			       tail, tail_len))
		wpa_printf(MSG_ERROR, "Failed to set beacon head/tail");

	os_free(tail);
	os_free(head);

	if (hostapd_set_cts_protect(hapd, cts_protection))
		wpa_printf(MSG_ERROR, "Failed to set CTS protect in kernel "
			   "driver");

	if (hapd->iface->current_mode &&
	    hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G &&
	    hostapd_set_short_slot_time(hapd,
					hapd->iface->num_sta_no_short_slot_time
					> 0 ? 0 : 1))
		wpa_printf(MSG_ERROR, "Failed to set Short Slot Time option "
			   "in kernel driver");

	if (hapd->iface->num_sta_no_short_preamble == 0 &&
	    hapd->iconf->preamble == SHORT_PREAMBLE)
		preamble = SHORT_PREAMBLE;
	else
		preamble = LONG_PREAMBLE;
	if (hostapd_set_preamble(hapd, preamble))
		wpa_printf(MSG_ERROR, "Could not set preamble for kernel "
			   "driver");
}


void ieee802_11_set_beacons(struct hostapd_iface *iface)
{
	size_t i;
	for (i = 0; i < iface->num_bss; i++)
		ieee802_11_set_beacon(iface->bss[i]);
}

#endif /* CONFIG_NATIVE_WINDOWS */
Commit	Line	Data
6fc6879b JM	1	/*
	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, Jouni Malinen <j@w1.fi>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Alternatively, this software may be distributed under the terms of BSD
	12	* license.
	13	*
	14	* See README and COPYING for more details.
	15	*/
	16
	17	#include "includes.h"
	18
	19	#ifndef CONFIG_NATIVE_WINDOWS
	20
	21	#include "hostapd.h"
	22	#include "ieee802_11.h"
	23	#include "wpa.h"
	24	#include "wme.h"
	25	#include "beacon.h"
	26	#include "hw_features.h"
	27	#include "driver.h"
	28	#include "sta_info.h"
	29	#include "ieee802_11h.h"
	30
	31
	32	static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
	33	{
	34	u8 erp = 0;
	35
	36	if (hapd->iface->current_mode == NULL \|\|
	37	hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
	38	return 0;
	39
	40	switch (hapd->iconf->cts_protection_type) {
	41	case CTS_PROTECTION_FORCE_ENABLED:
	42	erp \|= ERP_INFO_NON_ERP_PRESENT \| ERP_INFO_USE_PROTECTION;
	43	break;
	44	case CTS_PROTECTION_FORCE_DISABLED:
	45	erp = 0;
	46	break;
	47	case CTS_PROTECTION_AUTOMATIC:
	48	if (hapd->iface->olbc)
	49	erp \|= ERP_INFO_USE_PROTECTION;
	50	/* continue */
	51	case CTS_PROTECTION_AUTOMATIC_NO_OLBC:
	52	if (hapd->iface->num_sta_non_erp > 0) {
	53	erp \|= ERP_INFO_NON_ERP_PRESENT \|
	54	ERP_INFO_USE_PROTECTION;
	55	}
	56	break;
	57	}
	58	if (hapd->iface->num_sta_no_short_preamble > 0)
	59	erp \|= ERP_INFO_BARKER_PREAMBLE_MODE;
	60
	61	return erp;
	62	}
	63
	64
65	static u8 * hostapd_eid_ds_params(struct hostapd_data hapd, u8 eid)
66	{
67	*eid++ = WLAN_EID_DS_PARAMS;
68	*eid++ = 1;
69	*eid++ = hapd->iconf->channel;
70	return eid;
71	}
72
73
74	static u8 * hostapd_eid_erp_info(struct hostapd_data hapd, u8 eid)
75	{
76	if (hapd->iface->current_mode == NULL \|\|
77	hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
78	return eid;
79
80	/* Set NonERP_present and use_protection bits if there
81	* are any associated NonERP stations. */
82	/* TODO: use_protection bit can be set to zero even if
83	* there are NonERP stations present. This optimization
84	* might be useful if NonERP stations are "quiet".
85	* See 802.11g/D6 E-1 for recommended practice.
86	* In addition, Non ERP present might be set, if AP detects Non ERP
87	* operation on other APs. */
88
89	/* Add ERP Information element */
90	*eid++ = WLAN_EID_ERP_INFO;
91	*eid++ = 1;
92	*eid++ = ieee802_11_erp_info(hapd);
93
94	return eid;
95	}
96
97
98	static u8 * hostapd_eid_country(struct hostapd_data hapd, u8 eid,
99	int max_len)
100	{
101	u8 *pos = eid;
102
103	if ((!hapd->iconf->ieee80211d && !hapd->iface->dfs_enable) \|\|
104	max_len < 6)
105	return eid;
106
107	*pos++ = WLAN_EID_COUNTRY;
108	pos++; /* length will be set later */
109	os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
110	pos += 3;
111
112	if ((pos - eid) & 1)
113	pos++ = 0; / pad for 16-bit alignment */
114
115	eid[1] = (pos - eid) - 2;
116
117	return pos;
118	}
119
120
121	static u8 * hostapd_eid_power_constraint(struct hostapd_data hapd, u8 eid)
122
123	{
124	if (!hapd->iface->dfs_enable)
125	return eid;
126	*eid++ = WLAN_EID_PWR_CONSTRAINT;
127	*eid++ = 1;
128	*eid++ = hapd->iface->pwr_const;
129	return eid;
130	}
131
132
133	static u8 * hostapd_eid_tpc_report(struct hostapd_data hapd, u8 eid)
134
135	{
136	if (!hapd->iface->dfs_enable)
137	return eid;
138	*eid++ = WLAN_EID_TPC_REPORT;
139	*eid++ = 2;
140	eid++ = hapd->iface->tx_power; / TX POWER */
141	eid++ = 0; / Link Margin */
142	return eid;
143	}
144
145	static u8 * hostapd_eid_channel_switch(struct hostapd_data hapd, u8 eid)
146
147	{
148	if (!hapd->iface->dfs_enable \|\| !hapd->iface->channel_switch)
149	return eid;
150	*eid++ = WLAN_EID_CHANNEL_SWITCH;
151	*eid++ = 3;
152	*eid++ = CHAN_SWITCH_MODE_QUIET;
153	eid++ = hapd->iface->channel_switch; / New channel */
154	/* 0 - very soon; 1 - before next TBTT; num - after num beacons */
155	*eid++ = 0;
156	return eid;
157	}
158
159
160	static u8 * hostapd_eid_wpa(struct hostapd_data hapd, u8 eid, size_t len,
161	struct sta_info *sta)
162	{
163	const u8 *ie;
164	size_t ielen;
165
166	ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
167	if (ie == NULL \|\| ielen > len)
168	return eid;
169
170	os_memcpy(eid, ie, ielen);
171	return eid + ielen;
172	}
173
174
175	void handle_probe_req(struct hostapd_data hapd, struct ieee80211_mgmt mgmt,
176	size_t len)
177	{
178	struct ieee80211_mgmt *resp;
179	struct ieee802_11_elems elems;
180	char *ssid;
181	u8 pos, epos, *ie;
182	size_t ssid_len, ie_len;
183	struct sta_info *sta = NULL;
184
185	ie = mgmt->u.probe_req.variable;
186	ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
187
188	if (!hapd->iconf->send_probe_response)
189	return;
190
191	if (ieee802_11_parse_elems(hapd, ie, ie_len, &elems, 0) == ParseFailed)
192	{
193	wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
194	MAC2STR(mgmt->sa));
195	return;
196	}
197
198	ssid = NULL;
199	ssid_len = 0;
200
201	if ((!elems.ssid \|\| !elems.supp_rates)) {
202	wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
203	"without SSID or supported rates element",
204	MAC2STR(mgmt->sa));
205	return;
206	}
207
208	if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0) {
209	wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
210	"broadcast SSID ignored", MAC2STR(mgmt->sa));
211	return;
212	}
213
214	sta = ap_get_sta(hapd, mgmt->sa);
215
216	if (elems.ssid_len == 0 \|\|
217	(elems.ssid_len == hapd->conf->ssid.ssid_len &&
218	os_memcmp(elems.ssid, hapd->conf->ssid.ssid, elems.ssid_len) ==
219	0)) {
220	ssid = hapd->conf->ssid.ssid;
221	ssid_len = hapd->conf->ssid.ssid_len;
222	if (sta)
223	sta->ssid_probe = &hapd->conf->ssid;
224	}
225
226	if (!ssid) {
227	if (!(mgmt->da[0] & 0x01)) {
228	char ssid_txt[33];
229	ieee802_11_print_ssid(ssid_txt, elems.ssid,
230	elems.ssid_len);
231	wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
232	" for foreign SSID '%s'",
233	MAC2STR(mgmt->sa), ssid_txt);
234	}
235	return;
236	}
237
238	/* TODO: verify that supp_rates contains at least one matching rate
239	* with AP configuration */
240	#define MAX_PROBERESP_LEN 768
241	resp = os_zalloc(MAX_PROBERESP_LEN);
242	if (resp == NULL)
243	return;
244	epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
245
246	resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
247	WLAN_FC_STYPE_PROBE_RESP);
248	os_memcpy(resp->da, mgmt->sa, ETH_ALEN);
249	os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
250
251	os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
252	resp->u.probe_resp.beacon_int =
253	host_to_le16(hapd->iconf->beacon_int);
254
255	/* hardware or low-level driver will setup seq_ctrl and timestamp */
256	resp->u.probe_resp.capab_info =
257	host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
258
259	pos = resp->u.probe_resp.variable;
260	*pos++ = WLAN_EID_SSID;
261	*pos++ = ssid_len;
262	os_memcpy(pos, ssid, ssid_len);
263	pos += ssid_len;
264
265	/* Supported rates */
266	pos = hostapd_eid_supp_rates(hapd, pos);
267
268	/* DS Params */
269	pos = hostapd_eid_ds_params(hapd, pos);
270
271	pos = hostapd_eid_country(hapd, pos, epos - pos);
272
273	pos = hostapd_eid_power_constraint(hapd, pos);
274	pos = hostapd_eid_tpc_report(hapd, pos);
275
276	/* ERP Information element */
277	pos = hostapd_eid_erp_info(hapd, pos);
278
279	/* Extended supported rates */
280	pos = hostapd_eid_ext_supp_rates(hapd, pos);
281
282	pos = hostapd_eid_wpa(hapd, pos, epos - pos, sta);
283
284	/* Wi-Fi Wireless Multimedia Extensions */
285	if (hapd->conf->wme_enabled)
286	pos = hostapd_eid_wme(hapd, pos);
287
288	if (hostapd_send_mgmt_frame(hapd, resp, pos - (u8 *) resp, 0) < 0)
289	perror("handle_probe_req: send");
290
291	os_free(resp);
292
293	wpa_printf(MSG_MSGDUMP, "STA " MACSTR " sent probe request for %s "
294	"SSID", MAC2STR(mgmt->sa),
295	elems.ssid_len == 0 ? "broadcast" : "our");
296	}
297
298
299	void ieee802_11_set_beacon(struct hostapd_data *hapd)
300	{
301	struct ieee80211_mgmt *head;
302	u8 pos, tail, *tailpos;
303	int preamble;
304	u16 capab_info;
305	size_t head_len, tail_len;
306	int cts_protection = ((ieee802_11_erp_info(hapd) &
307	ERP_INFO_USE_PROTECTION) ? 1 : 0);
308
309	#define BEACON_HEAD_BUF_SIZE 256
310	#define BEACON_TAIL_BUF_SIZE 512
311	head = os_zalloc(BEACON_HEAD_BUF_SIZE);
312	tailpos = tail = os_malloc(BEACON_TAIL_BUF_SIZE);
313	if (head == NULL \|\| tail == NULL) {
314	wpa_printf(MSG_ERROR, "Failed to set beacon data");
315	os_free(head);
316	os_free(tail);
317	return;
318	}
319
320	head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
321	WLAN_FC_STYPE_BEACON);
322	head->duration = host_to_le16(0);
323	os_memset(head->da, 0xff, ETH_ALEN);
324
325	os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
326	os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
327	head->u.beacon.beacon_int =
328	host_to_le16(hapd->iconf->beacon_int);
329
330	/* hardware or low-level driver will setup seq_ctrl and timestamp */
331	capab_info = hostapd_own_capab_info(hapd, NULL, 0);
332	head->u.beacon.capab_info = host_to_le16(capab_info);
333	pos = &head->u.beacon.variable[0];
334
335	/* SSID */
336	*pos++ = WLAN_EID_SSID;
337	if (hapd->conf->ignore_broadcast_ssid == 2) {
338	/* clear the data, but keep the correct length of the SSID */
339	*pos++ = hapd->conf->ssid.ssid_len;
340	os_memset(pos, 0, hapd->conf->ssid.ssid_len);
341	pos += hapd->conf->ssid.ssid_len;
342	} else if (hapd->conf->ignore_broadcast_ssid) {
343	pos++ = 0; / empty SSID */
344	} else {
345	*pos++ = hapd->conf->ssid.ssid_len;
346	os_memcpy(pos, hapd->conf->ssid.ssid,
347	hapd->conf->ssid.ssid_len);
348	pos += hapd->conf->ssid.ssid_len;
349	}
350
351	/* Supported rates */
352	pos = hostapd_eid_supp_rates(hapd, pos);
353
354	/* DS Params */
355	pos = hostapd_eid_ds_params(hapd, pos);
356
357	head_len = pos - (u8 *) head;
358
359	tailpos = hostapd_eid_country(hapd, tailpos,
360	tail + BEACON_TAIL_BUF_SIZE - tailpos);
361
362	tailpos = hostapd_eid_power_constraint(hapd, tailpos);
363	tailpos = hostapd_eid_channel_switch(hapd, tailpos);
364	tailpos = hostapd_eid_tpc_report(hapd, tailpos);
365
366	/* ERP Information element */
367	tailpos = hostapd_eid_erp_info(hapd, tailpos);
368
369	/* Extended supported rates */
370	tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
371
372	tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
373	tailpos, NULL);
374
375	/* Wi-Fi Wireless Multimedia Extensions */
376	if (hapd->conf->wme_enabled)
377	tailpos = hostapd_eid_wme(hapd, tailpos);
378
379	tail_len = tailpos > tail ? tailpos - tail : 0;
380
381	if (hostapd_set_beacon(hapd->conf->iface, hapd, (u8 *) head, head_len,
382	tail, tail_len))
383	wpa_printf(MSG_ERROR, "Failed to set beacon head/tail");
384
385	os_free(tail);
386	os_free(head);
387
388	if (hostapd_set_cts_protect(hapd, cts_protection))
389	wpa_printf(MSG_ERROR, "Failed to set CTS protect in kernel "
390	"driver");
391
392	if (hapd->iface->current_mode &&
393	hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G &&
394	hostapd_set_short_slot_time(hapd,
395	hapd->iface->num_sta_no_short_slot_time
396	> 0 ? 0 : 1))
397	wpa_printf(MSG_ERROR, "Failed to set Short Slot Time option "
398	"in kernel driver");
399
400	if (hapd->iface->num_sta_no_short_preamble == 0 &&
401	hapd->iconf->preamble == SHORT_PREAMBLE)
402	preamble = SHORT_PREAMBLE;
403	else
404	preamble = LONG_PREAMBLE;
405	if (hostapd_set_preamble(hapd, preamble))
406	wpa_printf(MSG_ERROR, "Could not set preamble for kernel "
407	"driver");
408	}
409
410
411	void ieee802_11_set_beacons(struct hostapd_iface *iface)
412	{
413	size_t i;
414	for (i = 0; i < iface->num_bss; i++)
415	ieee802_11_set_beacon(iface->bss[i]);
416	}
417
418	#endif /* CONFIG_NATIVE_WINDOWS */