[thirdparty/hostap.git] / src / ap / 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) 2008-2009, 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 "utils/includes.h"

#ifndef CONFIG_NATIVE_WINDOWS

#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "drivers/driver.h"
#include "hostapd.h"
#include "ieee802_11.h"
#include "wpa_auth.h"
#include "wmm.h"
#include "ap_config.h"
#include "sta_info.h"
#include "beacon.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_add(u8 *pos, u8 *end, int chan_spacing,
				    struct hostapd_channel_data *start,
				    struct hostapd_channel_data *prev)
{
	if (end - pos < 3)
		return pos;

	/* first channel number */
	*pos++ = start->chan;
	/* number of channels */
	*pos++ = (prev->chan - start->chan) / chan_spacing + 1;
	/* maximum transmit power level */
	*pos++ = start->max_tx_power;

	return pos;
}


static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
				int max_len)
{
	u8 *pos = eid;
	u8 *end = eid + max_len;
	int i;
	struct hostapd_hw_modes *mode;
	struct hostapd_channel_data *start, *prev;
	int chan_spacing = 1;

	if (!hapd->iconf->ieee80211d || max_len < 6 ||
	    hapd->iface->current_mode == NULL)
		return eid;

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

	mode = hapd->iface->current_mode;
	if (mode->mode == HOSTAPD_MODE_IEEE80211A)
		chan_spacing = 4;

	start = prev = NULL;
	for (i = 0; i < mode->num_channels; i++) {
		struct hostapd_channel_data *chan = &mode->channels[i];
		if (chan->flag & HOSTAPD_CHAN_DISABLED)
			continue;
		if (start && prev &&
		    prev->chan + chan_spacing == chan->chan &&
		    start->max_tx_power == chan->max_tx_power) {
			prev = chan;
			continue; /* can use same entry */
		}

		if (start) {
			pos = hostapd_eid_country_add(pos, end, chan_spacing,
						      start, prev);
			start = NULL;
		}

		/* Start new group */
		start = prev = chan;
	}

	if (start) {
		pos = hostapd_eid_country_add(pos, end, chan_spacing,
					      start, prev);
	}

	if ((pos - eid) & 1) {
		if (end - pos < 1)
			return eid;
		*pos++ = 0; /* pad for 16-bit alignment */
	}

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

	return pos;
}


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,
		      const struct ieee80211_mgmt *mgmt, size_t len)
{
	struct ieee80211_mgmt *resp;
	struct ieee802_11_elems elems;
	char *ssid;
	u8 *pos, *epos;
	const u8 *ie;
	size_t ssid_len, ie_len;
	struct sta_info *sta = NULL;
	size_t buflen;
	size_t i;

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

	for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
		if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
					    mgmt->sa, ie, ie_len) > 0)
			return;

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

	if (ieee802_11_parse_elems(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
	buflen = MAX_PROBERESP_LEN;
#ifdef CONFIG_WPS
	if (hapd->wps_probe_resp_ie)
		buflen += wpabuf_len(hapd->wps_probe_resp_ie);
#endif /* CONFIG_WPS */
	resp = os_zalloc(buflen);
	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);

	/* 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 Alliance WMM */
	pos = hostapd_eid_wmm(hapd, pos);

#ifdef CONFIG_IEEE80211N
	pos = hostapd_eid_ht_capabilities(hapd, pos);
	pos = hostapd_eid_ht_operation(hapd, pos);
#endif /* CONFIG_IEEE80211N */

#ifdef CONFIG_WPS
	if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
		os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
			  wpabuf_len(hapd->wps_probe_resp_ie));
		pos += wpabuf_len(hapd->wps_probe_resp_ie);
	}
#endif /* CONFIG_WPS */

	if (hapd->drv.send_mgmt_frame(hapd, resp, pos - (u8 *) resp) < 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;
	u16 capab_info;
	size_t head_len, tail_len;

#define BEACON_HEAD_BUF_SIZE 256
#define BEACON_TAIL_BUF_SIZE 512
	head = os_zalloc(BEACON_HEAD_BUF_SIZE);
	tail_len = BEACON_TAIL_BUF_SIZE;
#ifdef CONFIG_WPS
	if (hapd->conf->wps_state && hapd->wps_beacon_ie)
		tail_len += wpabuf_len(hapd->wps_beacon_ie);
#endif /* CONFIG_WPS */
	tailpos = tail = os_malloc(tail_len);
	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);

	/* 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 Alliance WMM */
	tailpos = hostapd_eid_wmm(hapd, tailpos);

#ifdef CONFIG_IEEE80211N
	tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
	tailpos = hostapd_eid_ht_operation(hapd, tailpos);
#endif /* CONFIG_IEEE80211N */

#ifdef CONFIG_WPS
	if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
		os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
			  wpabuf_len(hapd->wps_beacon_ie));
		tailpos += wpabuf_len(hapd->wps_beacon_ie);
	}
#endif /* CONFIG_WPS */

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

	if (hapd->drv.set_beacon(hapd, (u8 *) head, head_len,
				 tail, tail_len, hapd->conf->dtim_period,
				 hapd->iconf->beacon_int))
		wpa_printf(MSG_ERROR, "Failed to set beacon head/tail or DTIM "
			   "period");

	os_free(tail);
	os_free(head);

	hapd->drv.set_bss_params(hapd, !!(ieee802_11_erp_info(hapd) &
					  ERP_INFO_USE_PROTECTION));
}


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.
a49148fd	5	* Copyright (c) 2008-2009, Jouni Malinen <j@w1.fi>
6fc6879b JM	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
6226e38d	17	#include "utils/includes.h"
6fc6879b JM	18
	19	#ifndef CONFIG_NATIVE_WINDOWS
	20
6226e38d	21	#include "utils/common.h"
81f4f619 JM	22	#include "common/ieee802_11_defs.h"
81f4f619 JM	23	#include "common/ieee802_11_common.h"
6226e38d	24	#include "drivers/driver.h"
6fc6879b JM	25	#include "hostapd.h"
6fc6879b JM	26	#include "ieee802_11.h"
6226e38d	27	#include "wpa_auth.h"
1057d78e	28	#include "wmm.h"
6226e38d	29	#include "ap_config.h"
6fc6879b	30	#include "sta_info.h"
6226e38d	31	#include "beacon.h"
6fc6879b JM	32
	33
	34	static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
	35	{
	36	u8 erp = 0;
	37
	38	if (hapd->iface->current_mode == NULL \|\|
	39	hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
	40	return 0;
	41
	42	switch (hapd->iconf->cts_protection_type) {
	43	case CTS_PROTECTION_FORCE_ENABLED:
	44	erp \|= ERP_INFO_NON_ERP_PRESENT \| ERP_INFO_USE_PROTECTION;
	45	break;
	46	case CTS_PROTECTION_FORCE_DISABLED:
	47	erp = 0;
	48	break;
	49	case CTS_PROTECTION_AUTOMATIC:
	50	if (hapd->iface->olbc)
	51	erp \|= ERP_INFO_USE_PROTECTION;
	52	/* continue */
	53	case CTS_PROTECTION_AUTOMATIC_NO_OLBC:
	54	if (hapd->iface->num_sta_non_erp > 0) {
	55	erp \|= ERP_INFO_NON_ERP_PRESENT \|
	56	ERP_INFO_USE_PROTECTION;
	57	}
	58	break;
	59	}
	60	if (hapd->iface->num_sta_no_short_preamble > 0)
	61	erp \|= ERP_INFO_BARKER_PREAMBLE_MODE;
	62
	63	return erp;
	64	}
	65
	66
	67	static u8 * hostapd_eid_ds_params(struct hostapd_data hapd, u8 eid)
	68	{
	69	*eid++ = WLAN_EID_DS_PARAMS;
	70	*eid++ = 1;
	71	*eid++ = hapd->iconf->channel;
	72	return eid;
	73	}
	74
	75
	76	static u8 * hostapd_eid_erp_info(struct hostapd_data hapd, u8 eid)
	77	{
	78	if (hapd->iface->current_mode == NULL \|\|
	79	hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
	80	return eid;
	81
	82	/* Set NonERP_present and use_protection bits if there
	83	* are any associated NonERP stations. */
	84	/* TODO: use_protection bit can be set to zero even if
	85	* there are NonERP stations present. This optimization
	86	* might be useful if NonERP stations are "quiet".
	87	* See 802.11g/D6 E-1 for recommended practice.
	88	* In addition, Non ERP present might be set, if AP detects Non ERP
	89	* operation on other APs. */
	90
	91	/* Add ERP Information element */
	92	*eid++ = WLAN_EID_ERP_INFO;
	93	*eid++ = 1;
	94	*eid++ = ieee802_11_erp_info(hapd);
	95
96	return eid;
97	}
98
99
df73d284 JM	100	static u8 * hostapd_eid_country_add(u8 pos, u8 end, int chan_spacing,
	101	struct hostapd_channel_data *start,
	102	struct hostapd_channel_data *prev)
	103	{
	104	if (end - pos < 3)
	105	return pos;
	106
	107	/* first channel number */
	108	*pos++ = start->chan;
	109	/* number of channels */
	110	*pos++ = (prev->chan - start->chan) / chan_spacing + 1;
	111	/* maximum transmit power level */
	112	*pos++ = start->max_tx_power;
	113
	114	return pos;
	115	}
	116
	117
6fc6879b JM	118	static u8 * hostapd_eid_country(struct hostapd_data hapd, u8 eid,
	119	int max_len)
	120	{
	121	u8 *pos = eid;
df73d284 JM	122	u8 *end = eid + max_len;
	123	int i;
	124	struct hostapd_hw_modes *mode;
	125	struct hostapd_channel_data start, prev;
	126	int chan_spacing = 1;
	127
	128	if (!hapd->iconf->ieee80211d \|\| max_len < 6 \|\|
	129	hapd->iface->current_mode == NULL)
6fc6879b JM	130	return eid;
	131
	132	*pos++ = WLAN_EID_COUNTRY;
	133	pos++; /* length will be set later */
	134	os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
	135	pos += 3;
	136
df73d284 JM	137	mode = hapd->iface->current_mode;
	138	if (mode->mode == HOSTAPD_MODE_IEEE80211A)
	139	chan_spacing = 4;
	140
	141	start = prev = NULL;
	142	for (i = 0; i < mode->num_channels; i++) {
	143	struct hostapd_channel_data *chan = &mode->channels[i];
	144	if (chan->flag & HOSTAPD_CHAN_DISABLED)
	145	continue;
	146	if (start && prev &&
	147	prev->chan + chan_spacing == chan->chan &&
	148	start->max_tx_power == chan->max_tx_power) {
	149	prev = chan;
	150	continue; /* can use same entry */
	151	}
	152
	153	if (start) {
	154	pos = hostapd_eid_country_add(pos, end, chan_spacing,
	155	start, prev);
	156	start = NULL;
	157	}
	158
	159	/* Start new group */
	160	start = prev = chan;
	161	}
	162
	163	if (start) {
	164	pos = hostapd_eid_country_add(pos, end, chan_spacing,
	165	start, prev);
	166	}
	167
	168	if ((pos - eid) & 1) {
	169	if (end - pos < 1)
	170	return eid;
6fc6879b	171	pos++ = 0; / pad for 16-bit alignment */
df73d284	172	}
6fc6879b JM	173
	174	eid[1] = (pos - eid) - 2;
	175
	176	return pos;
	177	}
	178
	179
6fc6879b JM	180	static u8 * hostapd_eid_wpa(struct hostapd_data hapd, u8 eid, size_t len,
	181	struct sta_info *sta)
	182	{
	183	const u8 *ie;
	184	size_t ielen;
	185
	186	ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
	187	if (ie == NULL \|\| ielen > len)
	188	return eid;
	189
	190	os_memcpy(eid, ie, ielen);
	191	return eid + ielen;
	192	}
	193
	194
b57e086c JM	195	void handle_probe_req(struct hostapd_data *hapd,
b57e086c JM	196	const struct ieee80211_mgmt *mgmt, size_t len)
6fc6879b JM	197	{
	198	struct ieee80211_mgmt *resp;
	199	struct ieee802_11_elems elems;
	200	char *ssid;
b57e086c JM	201	u8 pos, epos;
b57e086c JM	202	const u8 *ie;
6fc6879b JM	203	size_t ssid_len, ie_len;
6fc6879b JM	204	struct sta_info *sta = NULL;
1c08f8c0	205	size_t buflen;
94709ea3	206	size_t i;
6fc6879b JM	207
	208	ie = mgmt->u.probe_req.variable;
	209	ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
	210
94709ea3	211	for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
cd7d80f3 JM	212	if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
	213	mgmt->sa, ie, ie_len) > 0)
	214	return;
ad08c363	215
6fc6879b JM	216	if (!hapd->iconf->send_probe_response)
	217	return;
	218
3d536eb4	219	if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
6fc6879b JM	220	wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
	221	MAC2STR(mgmt->sa));
	222	return;
	223	}
	224
	225	ssid = NULL;
	226	ssid_len = 0;
	227
	228	if ((!elems.ssid \|\| !elems.supp_rates)) {
	229	wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
	230	"without SSID or supported rates element",
	231	MAC2STR(mgmt->sa));
	232	return;
	233	}
	234
	235	if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0) {
	236	wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
	237	"broadcast SSID ignored", MAC2STR(mgmt->sa));
	238	return;
	239	}
	240
	241	sta = ap_get_sta(hapd, mgmt->sa);
	242
	243	if (elems.ssid_len == 0 \|\|
	244	(elems.ssid_len == hapd->conf->ssid.ssid_len &&
	245	os_memcmp(elems.ssid, hapd->conf->ssid.ssid, elems.ssid_len) ==
	246	0)) {
	247	ssid = hapd->conf->ssid.ssid;
	248	ssid_len = hapd->conf->ssid.ssid_len;
	249	if (sta)
	250	sta->ssid_probe = &hapd->conf->ssid;
	251	}
	252
	253	if (!ssid) {
	254	if (!(mgmt->da[0] & 0x01)) {
	255	char ssid_txt[33];
	256	ieee802_11_print_ssid(ssid_txt, elems.ssid,
	257	elems.ssid_len);
	258	wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
	259	" for foreign SSID '%s'",
	260	MAC2STR(mgmt->sa), ssid_txt);
	261	}
	262	return;
	263	}
	264
	265	/* TODO: verify that supp_rates contains at least one matching rate
	266	* with AP configuration */
	267	#define MAX_PROBERESP_LEN 768
1c08f8c0 JM	268	buflen = MAX_PROBERESP_LEN;
	269	#ifdef CONFIG_WPS
	270	if (hapd->wps_probe_resp_ie)
	271	buflen += wpabuf_len(hapd->wps_probe_resp_ie);
	272	#endif /* CONFIG_WPS */
	273	resp = os_zalloc(buflen);
6fc6879b JM	274	if (resp == NULL)
	275	return;
	276	epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
	277
	278	resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
	279	WLAN_FC_STYPE_PROBE_RESP);
	280	os_memcpy(resp->da, mgmt->sa, ETH_ALEN);
	281	os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
	282
	283	os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
	284	resp->u.probe_resp.beacon_int =
	285	host_to_le16(hapd->iconf->beacon_int);
	286
	287	/* hardware or low-level driver will setup seq_ctrl and timestamp */
	288	resp->u.probe_resp.capab_info =
	289	host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
	290
	291	pos = resp->u.probe_resp.variable;
	292	*pos++ = WLAN_EID_SSID;
	293	*pos++ = ssid_len;
	294	os_memcpy(pos, ssid, ssid_len);
	295	pos += ssid_len;
	296
	297	/* Supported rates */
	298	pos = hostapd_eid_supp_rates(hapd, pos);
	299
	300	/* DS Params */
	301	pos = hostapd_eid_ds_params(hapd, pos);
	302
	303	pos = hostapd_eid_country(hapd, pos, epos - pos);
	304
6fc6879b JM	305	/* ERP Information element */
	306	pos = hostapd_eid_erp_info(hapd, pos);
	307
	308	/* Extended supported rates */
	309	pos = hostapd_eid_ext_supp_rates(hapd, pos);
	310
	311	pos = hostapd_eid_wpa(hapd, pos, epos - pos, sta);
	312
3ae0800c JM	313	/* Wi-Fi Alliance WMM */
3ae0800c JM	314	pos = hostapd_eid_wmm(hapd, pos);
6fc6879b	315
d45354be	316	#ifdef CONFIG_IEEE80211N
a49148fd	317	pos = hostapd_eid_ht_capabilities(hapd, pos);
9d2a76a2	318	pos = hostapd_eid_ht_operation(hapd, pos);
d45354be	319	#endif /* CONFIG_IEEE80211N */
de9289c8	320
ad08c363 JM	321	#ifdef CONFIG_WPS
ad08c363 JM	322	if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
14f79386 JM	323	os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
	324	wpabuf_len(hapd->wps_probe_resp_ie));
	325	pos += wpabuf_len(hapd->wps_probe_resp_ie);
ad08c363 JM	326	}
	327	#endif /* CONFIG_WPS */
	328
c90933d2	329	if (hapd->drv.send_mgmt_frame(hapd, resp, pos - (u8 *) resp) < 0)
6fc6879b JM	330	perror("handle_probe_req: send");
	331
	332	os_free(resp);
	333
	334	wpa_printf(MSG_MSGDUMP, "STA " MACSTR " sent probe request for %s "
	335	"SSID", MAC2STR(mgmt->sa),
	336	elems.ssid_len == 0 ? "broadcast" : "our");
	337	}
	338
	339
	340	void ieee802_11_set_beacon(struct hostapd_data *hapd)
	341	{
	342	struct ieee80211_mgmt *head;
	343	u8 pos, tail, *tailpos;
6fc6879b JM	344	u16 capab_info;
6fc6879b JM	345	size_t head_len, tail_len;
6fc6879b JM	346
	347	#define BEACON_HEAD_BUF_SIZE 256
	348	#define BEACON_TAIL_BUF_SIZE 512
	349	head = os_zalloc(BEACON_HEAD_BUF_SIZE);
1c08f8c0 JM	350	tail_len = BEACON_TAIL_BUF_SIZE;
	351	#ifdef CONFIG_WPS
	352	if (hapd->conf->wps_state && hapd->wps_beacon_ie)
	353	tail_len += wpabuf_len(hapd->wps_beacon_ie);
	354	#endif /* CONFIG_WPS */
	355	tailpos = tail = os_malloc(tail_len);
6fc6879b JM	356	if (head == NULL \|\| tail == NULL) {
	357	wpa_printf(MSG_ERROR, "Failed to set beacon data");
	358	os_free(head);
	359	os_free(tail);
	360	return;
	361	}
	362
	363	head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
	364	WLAN_FC_STYPE_BEACON);
	365	head->duration = host_to_le16(0);
	366	os_memset(head->da, 0xff, ETH_ALEN);
	367
	368	os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
	369	os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
	370	head->u.beacon.beacon_int =
	371	host_to_le16(hapd->iconf->beacon_int);
	372
	373	/* hardware or low-level driver will setup seq_ctrl and timestamp */
	374	capab_info = hostapd_own_capab_info(hapd, NULL, 0);
	375	head->u.beacon.capab_info = host_to_le16(capab_info);
	376	pos = &head->u.beacon.variable[0];
	377
	378	/* SSID */
	379	*pos++ = WLAN_EID_SSID;
	380	if (hapd->conf->ignore_broadcast_ssid == 2) {
	381	/* clear the data, but keep the correct length of the SSID */
	382	*pos++ = hapd->conf->ssid.ssid_len;
	383	os_memset(pos, 0, hapd->conf->ssid.ssid_len);
	384	pos += hapd->conf->ssid.ssid_len;
	385	} else if (hapd->conf->ignore_broadcast_ssid) {
	386	pos++ = 0; / empty SSID */
	387	} else {
	388	*pos++ = hapd->conf->ssid.ssid_len;
	389	os_memcpy(pos, hapd->conf->ssid.ssid,
	390	hapd->conf->ssid.ssid_len);
	391	pos += hapd->conf->ssid.ssid_len;
	392	}
	393
	394	/* Supported rates */
	395	pos = hostapd_eid_supp_rates(hapd, pos);
	396
	397	/* DS Params */
	398	pos = hostapd_eid_ds_params(hapd, pos);
	399
	400	head_len = pos - (u8 *) head;
	401
	402	tailpos = hostapd_eid_country(hapd, tailpos,
	403	tail + BEACON_TAIL_BUF_SIZE - tailpos);
	404
6fc6879b JM	405	/* ERP Information element */
	406	tailpos = hostapd_eid_erp_info(hapd, tailpos);
	407
	408	/* Extended supported rates */
	409	tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
	410
	411	tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
	412	tailpos, NULL);
	413
3ae0800c JM	414	/* Wi-Fi Alliance WMM */
3ae0800c JM	415	tailpos = hostapd_eid_wmm(hapd, tailpos);
6fc6879b	416
de9289c8	417	#ifdef CONFIG_IEEE80211N
677449b9 JM	418	tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
677449b9 JM	419	tailpos = hostapd_eid_ht_operation(hapd, tailpos);
de9289c8 JM	420	#endif /* CONFIG_IEEE80211N */
de9289c8 JM	421
ad08c363 JM	422	#ifdef CONFIG_WPS
ad08c363 JM	423	if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
14f79386 JM	424	os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
	425	wpabuf_len(hapd->wps_beacon_ie));
	426	tailpos += wpabuf_len(hapd->wps_beacon_ie);
ad08c363 JM	427	}
	428	#endif /* CONFIG_WPS */
	429
6fc6879b JM	430	tail_len = tailpos > tail ? tailpos - tail : 0;
6fc6879b JM	431
8b897f5a	432	if (hapd->drv.set_beacon(hapd, (u8 *) head, head_len,
677449b9 JM	433	tail, tail_len, hapd->conf->dtim_period,
677449b9 JM	434	hapd->iconf->beacon_int))
74f2ad32 JM	435	wpa_printf(MSG_ERROR, "Failed to set beacon head/tail or DTIM "
74f2ad32 JM	436	"period");
6fc6879b JM	437
	438	os_free(tail);
	439	os_free(head);
	440
677449b9 JM	441	hapd->drv.set_bss_params(hapd, !!(ieee802_11_erp_info(hapd) &
677449b9 JM	442	ERP_INFO_USE_PROTECTION));
6fc6879b JM	443	}
	444
	445
	446	void ieee802_11_set_beacons(struct hostapd_iface *iface)
	447	{
	448	size_t i;
	449	for (i = 0; i < iface->num_bss; i++)
	450	ieee802_11_set_beacon(iface->bss[i]);
	451	}
	452
	453	#endif /* CONFIG_NATIVE_WINDOWS */