freebsd-dev/contrib/hostapd/ieee802_11.c

/*
 * Host AP (software wireless LAN access point) user space daemon for
 * Host AP kernel driver / IEEE 802.11 Management
 * Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <time.h>

#include "eloop.h"
#include "hostapd.h"
#include "ieee802_11.h"
#include "radius.h"
#include "radius_client.h"
#include "ieee802_11_auth.h"
#include "sta_info.h"
#include "eapol_sm.h"
#include "rc4.h"
#include "ieee802_1x.h"
#include "wpa.h"
#include "accounting.h"
#include "driver.h"


static u8 * hostapd_eid_supp_rates(hostapd *hapd, u8 *eid)
{
	u8 *pos = eid;

	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = 4; /* len */
	*pos++ = 0x82; /* 1 Mbps, base set */
	*pos++ = 0x84; /* 2 Mbps, base set */
	*pos++ = 0x0b; /* 5.5 Mbps */
	*pos++ = 0x16; /* 11 Mbps */

	return pos;
}


static u16 hostapd_own_capab_info(hostapd *hapd)
{
	int capab = WLAN_CAPABILITY_ESS;
	if (hapd->conf->wpa ||
	    (hapd->conf->ieee802_1x &&
	     (hapd->conf->default_wep_key_len ||
	      hapd->conf->individual_wep_key_len)))
		capab |= WLAN_CAPABILITY_PRIVACY;
	return capab;
}


static const u8 WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 };

ParseRes ieee802_11_parse_elems(struct hostapd_data *hapd, u8 *start,
				size_t len,
				struct ieee802_11_elems *elems,
				int show_errors)
{
	size_t left = len;
	u8 *pos = start;
	int unknown = 0;

	memset(elems, 0, sizeof(*elems));

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

		if (elen > left) {
			if (show_errors) {
				HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
					      "IEEE 802.11 element parse "
					      "failed (id=%d elen=%d "
					      "left=%lu)\n",
					      id, elen, (unsigned long) left);
				if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL))
					hostapd_hexdump("IEs", start, len);
			}
			return ParseFailed;
		}

		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			elems->tim = pos;
			elems->tim_len = elen;
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_GENERIC:
			if (elen > 4 && memcmp(pos, WPA_OUI_TYPE, 4) == 0) {
				elems->wpa_ie = pos;
				elems->wpa_ie_len = elen;
			} else if (show_errors) {
				HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
					      "IEEE 802.11 element parse "
					      "ignored unknown generic element"
					      " (id=%d elen=%d OUI:type="
					      "%02x-%02x-%02x:%d)\n",
					      id, elen,
					      elen >= 1 ? pos[0] : 0,
					      elen >= 2 ? pos[1] : 0,
					      elen >= 3 ? pos[2] : 0,
					      elen >= 4 ? pos[3] : 0);
				unknown++;
			} else {
				unknown++;
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn_ie = pos;
			elems->rsn_ie_len = elen;
			break;
		default:
			unknown++;
			if (!show_errors)
				break;
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
				      "IEEE 802.11 element parse ignored "
				      "unknown element (id=%d elen=%d)\n",
				      id, elen);
			break;
		}

		left -= elen;
		pos += elen;
	}

	if (left)
		return ParseFailed;

	return unknown ? ParseUnknown : ParseOK;
}


static void ieee802_11_print_ssid(u8 *ssid, u8 len)
{
	int i;
	for (i = 0; i < len; i++) {
		if (ssid[i] >= 32 && ssid[i] < 127)
			printf("%c", ssid[i]);
		else
			printf("<%02x>", ssid[i]);
	}
}


static void ieee802_11_sta_authenticate(void *eloop_ctx, void *timeout_ctx)
{
	hostapd *hapd = eloop_ctx;
	struct ieee80211_mgmt mgmt;

	if (hapd->assoc_ap_state == WAIT_BEACON)
		hapd->assoc_ap_state = AUTHENTICATE;
	if (hapd->assoc_ap_state != AUTHENTICATE)
		return;

	printf("Authenticate with AP " MACSTR " SSID=",
	       MAC2STR(hapd->conf->assoc_ap_addr));
	ieee802_11_print_ssid(hapd->assoc_ap_ssid, hapd->assoc_ap_ssid_len);
	printf(" (as station)\n");

	memset(&mgmt, 0, sizeof(mgmt));
	mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_AUTH);
	/* Request TX callback */
	mgmt.frame_control |= host_to_le16(BIT(1));
	memcpy(mgmt.da, hapd->conf->assoc_ap_addr, ETH_ALEN);
	memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
	memcpy(mgmt.bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
	mgmt.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
	mgmt.u.auth.auth_transaction = host_to_le16(1);
	mgmt.u.auth.status_code = host_to_le16(0);
	if (hostapd_send_mgmt_frame(hapd, &mgmt, IEEE80211_HDRLEN +
				    sizeof(mgmt.u.auth), 0) < 0)
		perror("ieee802_11_sta_authenticate: send");

	/* Try to authenticate again, if this attempt fails or times out. */
	eloop_register_timeout(5, 0, ieee802_11_sta_authenticate, hapd, NULL);
}


static void ieee802_11_sta_associate(void *eloop_ctx, void *timeout_ctx)
{
	hostapd *hapd = eloop_ctx;
	u8 buf[256];
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
	u8 *p;

	if (hapd->assoc_ap_state == AUTHENTICATE)
		hapd->assoc_ap_state = ASSOCIATE;
	if (hapd->assoc_ap_state != ASSOCIATE)
		return;

	printf("Associate with AP " MACSTR " SSID=",
	       MAC2STR(hapd->conf->assoc_ap_addr));
	ieee802_11_print_ssid(hapd->assoc_ap_ssid, hapd->assoc_ap_ssid_len);
	printf(" (as station)\n");

	memset(mgmt, 0, sizeof(*mgmt));
	mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					  WLAN_FC_STYPE_ASSOC_REQ);
	/* Request TX callback */
	mgmt->frame_control |= host_to_le16(BIT(1));
	memcpy(mgmt->da, hapd->conf->assoc_ap_addr, ETH_ALEN);
	memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
	memcpy(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
	mgmt->u.assoc_req.capab_info = host_to_le16(0);
	mgmt->u.assoc_req.listen_interval = host_to_le16(1);
	p = &mgmt->u.assoc_req.variable[0];

	*p++ = WLAN_EID_SSID;
	*p++ = hapd->assoc_ap_ssid_len;
	memcpy(p, hapd->assoc_ap_ssid, hapd->assoc_ap_ssid_len);
	p += hapd->assoc_ap_ssid_len;

	p = hostapd_eid_supp_rates(hapd, p);

	if (hostapd_send_mgmt_frame(hapd, mgmt, p - (u8 *) mgmt, 0) < 0)
		perror("ieee802_11_sta_associate: send");

	/* Try to authenticate again, if this attempt fails or times out. */
	eloop_register_timeout(5, 0, ieee802_11_sta_associate, hapd, NULL);
}


static u16 auth_shared_key(hostapd *hapd, struct sta_info *sta,
			   u16 auth_transaction, u8 *challenge, int iswep)
{
	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_DEBUG,
		       "authentication (shared key, transaction %d)",
		       auth_transaction);

	if (auth_transaction == 1) {
		if (!sta->challenge) {
			/* Generate a pseudo-random challenge */
			u8 key[8];
			time_t now;
			int r;
			sta->challenge = malloc(WLAN_AUTH_CHALLENGE_LEN);
			if (!sta->challenge)
				return WLAN_STATUS_UNSPECIFIED_FAILURE;
			memset(sta->challenge, 0, WLAN_AUTH_CHALLENGE_LEN);

			now = time(NULL);
			r = random();
			memcpy(key, &now, 4);
			memcpy(key + 4, &r, 4);
			rc4(sta->challenge, WLAN_AUTH_CHALLENGE_LEN,
			    key, sizeof(key));
		}
		return 0;
	}

	if (auth_transaction != 3)
		return WLAN_STATUS_UNSPECIFIED_FAILURE;

	/* Transaction 3 */
	if (!iswep || !sta->challenge || !challenge ||
	    memcmp(sta->challenge, challenge, WLAN_AUTH_CHALLENGE_LEN)) {
		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_INFO,
			       "shared key authentication - invalid "
			       "challenge-response");
		return WLAN_STATUS_CHALLENGE_FAIL;
	}

	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_DEBUG,
		       "authentication OK (shared key)");
#ifdef IEEE80211_REQUIRE_AUTH_ACK
	/* Station will be marked authenticated if it ACKs the
	 * authentication reply. */
#else
	sta->flags |= WLAN_STA_AUTH;
	wpa_sm_event(hapd, sta, WPA_AUTH);
#endif
	free(sta->challenge);
	sta->challenge = NULL;

	return 0;
}


static void send_auth_reply(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			    u16 auth_alg, u16 auth_transaction, u16 resp,
			    u8 *challenge)
{
	u8 buf[IEEE80211_HDRLEN + sizeof(mgmt->u.auth) + 2 +
	       WLAN_AUTH_CHALLENGE_LEN];
	struct ieee80211_mgmt *reply;
	size_t rlen;

	memset(buf, 0, sizeof(buf));
	reply = (struct ieee80211_mgmt *) buf;
	reply->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
					   WLAN_FC_STYPE_AUTH);
	/* Request TX callback */
	reply->frame_control |= host_to_le16(BIT(1));
	memcpy(reply->da, mgmt->sa, ETH_ALEN);
	memcpy(reply->sa, hapd->own_addr, ETH_ALEN);
	memcpy(reply->bssid, mgmt->bssid, ETH_ALEN);

	reply->u.auth.auth_alg = host_to_le16(auth_alg);
	reply->u.auth.auth_transaction = host_to_le16(auth_transaction);
	reply->u.auth.status_code = host_to_le16(resp);
	rlen = IEEE80211_HDRLEN + sizeof(reply->u.auth);
	if (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 2 &&
	    challenge) {
		u8 *p = reply->u.auth.variable;
		*p++ = WLAN_EID_CHALLENGE;
		*p++ = WLAN_AUTH_CHALLENGE_LEN;
		memcpy(p, challenge, WLAN_AUTH_CHALLENGE_LEN);
		rlen += 2 + WLAN_AUTH_CHALLENGE_LEN;
	} else
		challenge = NULL;

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		      "authentication reply: STA=" MACSTR " auth_alg=%d "
		      "auth_transaction=%d resp=%d%s\n",
		      MAC2STR(mgmt->sa), auth_alg, auth_transaction,
		      resp, challenge ? " challenge" : "");
	if (hostapd_send_mgmt_frame(hapd, reply, rlen, 0) < 0)
		perror("send_auth_reply: send");
}


static void handle_auth(hostapd *hapd, struct ieee80211_mgmt *mgmt, size_t len)
{
	u16 auth_alg, auth_transaction, status_code;
	u16 resp = WLAN_STATUS_SUCCESS;
	struct sta_info *sta = NULL;
	int res;
	u16 fc;
	u8 *challenge = NULL;
	u32 session_timeout, acct_interim_interval;

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
		printf("handle_auth - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
	auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
	status_code = le_to_host16(mgmt->u.auth.status_code);
	fc = le_to_host16(mgmt->frame_control);

	if (len >= IEEE80211_HDRLEN + sizeof(mgmt->u.auth) +
	    2 + WLAN_AUTH_CHALLENGE_LEN &&
	    mgmt->u.auth.variable[0] == WLAN_EID_CHALLENGE &&
	    mgmt->u.auth.variable[1] == WLAN_AUTH_CHALLENGE_LEN)
		challenge = &mgmt->u.auth.variable[2];

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		      "authentication: STA=" MACSTR " auth_alg=%d "
		      "auth_transaction=%d status_code=%d wep=%d%s\n",
		      MAC2STR(mgmt->sa), auth_alg, auth_transaction,
		      status_code, !!(fc & WLAN_FC_ISWEP),
		      challenge ? " challenge" : "");

	if (hapd->assoc_ap_state == AUTHENTICATE && auth_transaction == 2 &&
	    memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0 &&
	    memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
		if (status_code != 0) {
			printf("Authentication (as station) with AP "
			       MACSTR " failed (status_code=%d)\n",
			       MAC2STR(hapd->conf->assoc_ap_addr),
			       status_code);
			return;
		}
		printf("Authenticated (as station) with AP " MACSTR "\n",
		       MAC2STR(hapd->conf->assoc_ap_addr));
		ieee802_11_sta_associate(hapd, NULL);
		return;
	}

	if (hapd->tkip_countermeasures) {
		resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
		goto fail;
	}

	if (!(((hapd->conf->auth_algs & HOSTAPD_AUTH_OPEN) &&
	       auth_alg == WLAN_AUTH_OPEN) ||
	      ((hapd->conf->auth_algs & HOSTAPD_AUTH_SHARED_KEY) &&
	       auth_alg == WLAN_AUTH_SHARED_KEY))) {
		printf("Unsupported authentication algorithm (%d)\n",
		       auth_alg);
		resp = WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG;
		goto fail;
	}

	if (!(auth_transaction == 1 ||
	      (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 3))) {
		printf("Unknown authentication transaction number (%d)\n",
		       auth_transaction);
		resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
		goto fail;
	}

	if (memcmp(mgmt->sa, hapd->own_addr, ETH_ALEN) == 0) {
		printf("Station " MACSTR " not allowed to authenticate.\n",
		       MAC2STR(mgmt->sa));
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}

	res = hostapd_allowed_address(hapd, mgmt->sa, (u8 *) mgmt, len,
				      &session_timeout,
				      &acct_interim_interval);
	if (res == HOSTAPD_ACL_REJECT) {
		printf("Station " MACSTR " not allowed to authenticate.\n",
		       MAC2STR(mgmt->sa));
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}
	if (res == HOSTAPD_ACL_PENDING) {
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Authentication frame "
			      "from " MACSTR " waiting for an external "
			      "authentication\n", MAC2STR(mgmt->sa));
		/* Authentication code will re-send the authentication frame
		 * after it has received (and cached) information from the
		 * external source. */
		return;
	}

	sta = ap_sta_add(hapd, mgmt->sa);
	if (!sta) {
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}
	sta->flags &= ~WLAN_STA_PREAUTH;
	ieee802_1x_notify_pre_auth(sta->eapol_sm, 0);

	if (hapd->conf->radius_acct_interim_interval == 0 &&
	    acct_interim_interval)
		sta->acct_interim_interval = acct_interim_interval;
	if (res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
		ap_sta_session_timeout(hapd, sta, session_timeout);
	else
		ap_sta_no_session_timeout(hapd, sta);

	switch (auth_alg) {
	case WLAN_AUTH_OPEN:
		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_DEBUG,
			       "authentication OK (open system)");
#ifdef IEEE80211_REQUIRE_AUTH_ACK
		/* Station will be marked authenticated if it ACKs the
		 * authentication reply. */
#else
		sta->flags |= WLAN_STA_AUTH;
		wpa_sm_event(hapd, sta, WPA_AUTH);
#endif
		break;
	case WLAN_AUTH_SHARED_KEY:
		resp = auth_shared_key(hapd, sta, auth_transaction, challenge,
				       fc & WLAN_FC_ISWEP);
		break;
	}

 fail:
	send_auth_reply(hapd, mgmt, auth_alg, auth_transaction + 1, resp,
			sta ? sta->challenge : NULL);
}


static void handle_assoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			 size_t len, int reassoc)
{
	u16 capab_info, listen_interval;
	u16 resp = WLAN_STATUS_SUCCESS;
	u8 *pos, *wpa_ie;
	size_t wpa_ie_len;
	int send_deauth = 0, send_len, left, i;
	struct sta_info *sta;
	struct ieee802_11_elems elems;

	if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
				      sizeof(mgmt->u.assoc_req))) {
		printf("handle_assoc(reassoc=%d) - too short payload (len=%lu)"
		       "\n", reassoc, (unsigned long) len);
		return;
	}

	if (reassoc) {
		capab_info = le_to_host16(mgmt->u.reassoc_req.capab_info);
		listen_interval = le_to_host16(
			mgmt->u.reassoc_req.listen_interval);
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
			      "reassociation request: STA=" MACSTR
			      " capab_info=0x%02x "
			      "listen_interval=%d current_ap=" MACSTR "\n",
			      MAC2STR(mgmt->sa), capab_info, listen_interval,
			      MAC2STR(mgmt->u.reassoc_req.current_ap));
		left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.reassoc_req));
		pos = mgmt->u.reassoc_req.variable;
	} else {
		capab_info = le_to_host16(mgmt->u.assoc_req.capab_info);
		listen_interval = le_to_host16(
			mgmt->u.assoc_req.listen_interval);
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
			      "association request: STA=" MACSTR
			      " capab_info=0x%02x listen_interval=%d\n",
			      MAC2STR(mgmt->sa), capab_info, listen_interval);
		left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_req));
		pos = mgmt->u.assoc_req.variable;
	}

	sta = ap_get_sta(hapd, mgmt->sa);
	if (sta == NULL || (sta->flags & WLAN_STA_AUTH) == 0) {
		printf("STA " MACSTR " trying to associate before "
		       "authentication\n", MAC2STR(mgmt->sa));
		if (sta) {
			printf("  sta: addr=" MACSTR " aid=%d flags=0x%04x\n",
			       MAC2STR(sta->addr), sta->aid, sta->flags);
		}
		send_deauth = 1;
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}

	if (hapd->tkip_countermeasures) {
		resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
		goto fail;
	}

	sta->capability = capab_info;

	/* followed by SSID and Supported rates */
	if (ieee802_11_parse_elems(hapd, pos, left, &elems, 1) == ParseFailed
	    || !elems.ssid) {
		printf("STA " MACSTR " sent invalid association request\n",
		       MAC2STR(sta->addr));
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}

	if (elems.ssid_len != hapd->conf->ssid_len ||
	    memcmp(elems.ssid, hapd->conf->ssid, elems.ssid_len) != 0) {
		printf("Station " MACSTR " tried to associate with "
		       "unknown SSID '", MAC2STR(sta->addr));
		ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
		printf("'\n");
		resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
		goto fail;
	}

	if (elems.supp_rates) {
		if (elems.supp_rates_len > sizeof(sta->supported_rates)) {
			printf("STA " MACSTR ": Invalid supported rates "
			       "element length %d\n", MAC2STR(sta->addr),
			       elems.supp_rates_len);
			resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
			goto fail;
		}

		memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
		memcpy(sta->supported_rates, elems.supp_rates,
		       elems.supp_rates_len);

		sta->tx_supp_rates = 0;
		for (i = 0; i < elems.supp_rates_len; i++) {
			if ((sta->supported_rates[i] & 0x7f) == 2)
				sta->tx_supp_rates |= WLAN_RATE_1M;
			if ((sta->supported_rates[i] & 0x7f) == 4)
				sta->tx_supp_rates |= WLAN_RATE_2M;
			if ((sta->supported_rates[i] & 0x7f) == 11)
				sta->tx_supp_rates |= WLAN_RATE_5M5;
			if ((sta->supported_rates[i] & 0x7f) == 22)
				sta->tx_supp_rates |= WLAN_RATE_11M;
		}
	} else
		sta->tx_supp_rates = 0xff;

	if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA2) && elems.rsn_ie) {
		wpa_ie = elems.rsn_ie;
		wpa_ie_len = elems.rsn_ie_len;
	} else if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA) &&
		   elems.wpa_ie) {
		wpa_ie = elems.wpa_ie;
		wpa_ie_len = elems.wpa_ie_len;
	} else {
		wpa_ie = NULL;
		wpa_ie_len = 0;
	}
	if (hapd->conf->wpa && wpa_ie == NULL) {
		printf("STA " MACSTR ": No WPA/RSN IE in association "
		       "request\n", MAC2STR(sta->addr));
		resp = WLAN_STATUS_INVALID_IE;
		goto fail;
	}

	if (hapd->conf->wpa) {
		int res;
		wpa_ie -= 2;
		wpa_ie_len += 2;
		res = wpa_validate_wpa_ie(hapd, sta, wpa_ie, wpa_ie_len,
					  elems.rsn_ie ?
					  HOSTAPD_WPA_VERSION_WPA2 :
					  HOSTAPD_WPA_VERSION_WPA);
		if (res == WPA_INVALID_GROUP)
			resp = WLAN_STATUS_GROUP_CIPHER_NOT_VALID;
		else if (res == WPA_INVALID_PAIRWISE)
			resp = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
		else if (res == WPA_INVALID_AKMP)
			resp = WLAN_STATUS_AKMP_NOT_VALID;
		else if (res != WPA_IE_OK)
			resp = WLAN_STATUS_INVALID_IE;
		if (resp != WLAN_STATUS_SUCCESS)
			goto fail;
		free(sta->wpa_ie);
		sta->wpa_ie = malloc(wpa_ie_len);
		if (sta->wpa_ie == NULL) {
			resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
			goto fail;
		}
		sta->wpa_ie_len = wpa_ie_len;
		memcpy(sta->wpa_ie, wpa_ie, wpa_ie_len);
	}

	/* get a unique AID */
	if (sta->aid > 0) {
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
			      "  old AID %d\n", sta->aid);
	} else {
		for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
			if (hapd->sta_aid[sta->aid - 1] == NULL)
				break;
		if (sta->aid > MAX_AID_TABLE_SIZE) {
			sta->aid = 0;
			resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
			printf("  no room for more AIDs\n");
			goto fail;
		} else {
			hapd->sta_aid[sta->aid - 1] = sta;
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "  new AID %d\n", sta->aid);
		}
	}

	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_DEBUG,
		       "association OK (aid %d)", sta->aid);
	/* Station will be marked associated, after it acknowledges AssocResp
	 */

	if (sta->last_assoc_req)
		free(sta->last_assoc_req);
	sta->last_assoc_req = (struct ieee80211_mgmt *) malloc(len);
	if (sta->last_assoc_req)
		memcpy(sta->last_assoc_req, mgmt, len);

	/* Make sure that the previously registered inactivity timer will not
	 * remove the STA immediately. */
	sta->timeout_next = STA_NULLFUNC;

 fail:

	/* use the queued buffer for transmission because it is large enough
	 * and not needed anymore */
	mgmt->frame_control =
		IEEE80211_FC(WLAN_FC_TYPE_MGMT,
			     (send_deauth ? WLAN_FC_STYPE_DEAUTH :
			      (reassoc ? WLAN_FC_STYPE_REASSOC_RESP :
			       WLAN_FC_STYPE_ASSOC_RESP)));
	memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
	memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
	/* Addr3 = BSSID - already set */

	send_len = IEEE80211_HDRLEN;
	if (send_deauth) {
		send_len += sizeof(mgmt->u.deauth);
		mgmt->u.deauth.reason_code = host_to_le16(resp);
	} else {
		u8 *p;
		send_len += sizeof(mgmt->u.assoc_resp);
		mgmt->u.assoc_resp.capab_info =
			host_to_le16(hostapd_own_capab_info(hapd));
		mgmt->u.assoc_resp.status_code = host_to_le16(resp);
		mgmt->u.assoc_resp.aid = host_to_le16((sta ? sta->aid : 0)
						      | BIT(14) | BIT(15));
		/* Supported rates */
		p = hostapd_eid_supp_rates(hapd, mgmt->u.assoc_resp.variable);
		send_len += p - mgmt->u.assoc_resp.variable;

		/* Request TX callback */
		mgmt->frame_control |= host_to_le16(BIT(1));
	}

	if (hostapd_send_mgmt_frame(hapd, mgmt, send_len, 0) < 0)
		perror("handle_assoc: send");
}


static void handle_assoc_resp(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			      size_t len)
{
	u16 status_code, aid;

	if (hapd->assoc_ap_state != ASSOCIATE) {
		printf("Unexpected association response received from " MACSTR
		       "\n", MAC2STR(mgmt->sa));
		return;
	}

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp)) {
		printf("handle_assoc_resp - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	if (memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0 ||
	    memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0) {
		printf("Received association response from unexpected address "
		       "(SA=" MACSTR " BSSID=" MACSTR "\n",
		       MAC2STR(mgmt->sa), MAC2STR(mgmt->bssid));
		return;
	}

	status_code = le_to_host16(mgmt->u.assoc_resp.status_code);
	aid = le_to_host16(mgmt->u.assoc_resp.aid);
	aid &= ~(BIT(14) | BIT(15));

	if (status_code != 0) {
		printf("Association (as station) with AP " MACSTR " failed "
		       "(status_code=%d)\n",
		       MAC2STR(hapd->conf->assoc_ap_addr), status_code);
		/* Try to authenticate again */
		hapd->assoc_ap_state = AUTHENTICATE;
		eloop_register_timeout(5, 0, ieee802_11_sta_authenticate,
				       hapd, NULL);
	}

	printf("Associated (as station) with AP " MACSTR " (aid=%d)\n",
	       MAC2STR(hapd->conf->assoc_ap_addr), aid);
	hapd->assoc_ap_aid = aid;
	hapd->assoc_ap_state = ASSOCIATED;

	if (hostapd_set_assoc_ap(hapd, hapd->conf->assoc_ap_addr)) {
		printf("Could not set associated AP address to kernel "
		       "driver.\n");
	}
}


static void handle_disassoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			    size_t len)
{
	struct sta_info *sta;

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.disassoc)) {
		printf("handle_disassoc - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		      "disassocation: STA=" MACSTR " reason_code=%d\n",
		      MAC2STR(mgmt->sa),
		      le_to_host16(mgmt->u.disassoc.reason_code));

	if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
	    memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
		printf("Assoc AP " MACSTR " sent disassociation "
		       "(reason_code=%d) - try to authenticate\n",
		       MAC2STR(hapd->conf->assoc_ap_addr),
		       le_to_host16(mgmt->u.disassoc.reason_code));
		hapd->assoc_ap_state = AUTHENTICATE;
		ieee802_11_sta_authenticate(hapd, NULL);
		eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
				       hapd, NULL);
		return;
	}

	sta = ap_get_sta(hapd, mgmt->sa);
	if (sta == NULL) {
		printf("Station " MACSTR " trying to disassociate, but it "
		       "is not associated.\n", MAC2STR(mgmt->sa));
		return;
	}

	sta->flags &= ~WLAN_STA_ASSOC;
	wpa_sm_event(hapd, sta, WPA_DISASSOC);
	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_INFO, "disassociated");
	sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
	ieee802_1x_set_port_enabled(hapd, sta, 0);
	/* Stop Accounting and IEEE 802.1X sessions, but leave the STA
	 * authenticated. */
	accounting_sta_stop(hapd, sta);
	ieee802_1x_free_station(sta);
	hostapd_sta_remove(hapd, sta->addr);

	if (sta->timeout_next == STA_NULLFUNC ||
	    sta->timeout_next == STA_DISASSOC) {
		sta->timeout_next = STA_DEAUTH;
		eloop_cancel_timeout(ap_handle_timer, hapd, sta);
		eloop_register_timeout(AP_DEAUTH_DELAY, 0, ap_handle_timer,
				       hapd, sta);
	}
}


static void handle_deauth(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			  size_t len)
{
	struct sta_info *sta;

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.deauth)) {
		printf("handle_deauth - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
		      "deauthentication: STA=" MACSTR " reason_code=%d\n",
		      MAC2STR(mgmt->sa),
		      le_to_host16(mgmt->u.deauth.reason_code));

	if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
	    memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
		printf("Assoc AP " MACSTR " sent deauthentication "
		       "(reason_code=%d) - try to authenticate\n",
		       MAC2STR(hapd->conf->assoc_ap_addr),
		       le_to_host16(mgmt->u.deauth.reason_code));
		hapd->assoc_ap_state = AUTHENTICATE;
		eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
				       hapd, NULL);
		return;
	}

	sta = ap_get_sta(hapd, mgmt->sa);
	if (sta == NULL) {
		printf("Station " MACSTR " trying to deauthenticate, but it "
		       "is not authenticated.\n", MAC2STR(mgmt->sa));
		return;
	}

	sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
	wpa_sm_event(hapd, sta, WPA_DEAUTH);
	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_DEBUG, "deauthenticated");
	sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
	ieee802_1x_set_port_enabled(hapd, sta, 0);
	ap_free_sta(hapd, sta);
}


static void handle_beacon(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			  size_t len)
{
	struct ieee802_11_elems elems;

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.beacon)) {
		printf("handle_beacon - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	(void) ieee802_11_parse_elems(hapd, mgmt->u.beacon.variable,
				      len - (IEEE80211_HDRLEN +
					     sizeof(mgmt->u.beacon)), &elems,
				      0);

	if (hapd->assoc_ap_state == WAIT_BEACON &&
	    memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
		if (elems.ssid && elems.ssid_len <= 32) {
			memcpy(hapd->assoc_ap_ssid, elems.ssid,
			       elems.ssid_len);
			hapd->assoc_ap_ssid[elems.ssid_len] = '\0';
			hapd->assoc_ap_ssid_len = elems.ssid_len;
		}
		ieee802_11_sta_authenticate(hapd, NULL);
	}

	if (!HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_EXCESSIVE))
		return;

	printf("Beacon from " MACSTR, MAC2STR(mgmt->sa));
	if (elems.ssid) {
		printf(" SSID='");
		ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
		printf("'");
	}
	if (elems.ds_params && elems.ds_params_len == 1)
		printf(" CHAN=%d", elems.ds_params[0]);
	printf("\n");
}


void ieee802_11_mgmt(struct hostapd_data *hapd, u8 *buf, size_t len, u16 stype)
{
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;

	if (stype == WLAN_FC_STYPE_BEACON) {
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE, "mgmt::beacon\n");
		handle_beacon(hapd, mgmt, len);
		return;
	}

	if (memcmp(mgmt->bssid, hapd->own_addr, ETH_ALEN) != 0 &&
	    (hapd->assoc_ap_state == DO_NOT_ASSOC ||
	     memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0)) {
		printf("MGMT: BSSID=" MACSTR " not our address\n",
		       MAC2STR(mgmt->bssid));
		return;
	}


	if (stype == WLAN_FC_STYPE_PROBE_REQ) {
		printf("mgmt::probe_req\n");
		return;
	}

	if (memcmp(mgmt->da, hapd->own_addr, ETH_ALEN) != 0) {
		printf("MGMT: DA=" MACSTR " not our address\n",
		       MAC2STR(mgmt->da));
		return;
	}

	switch (stype) {
	case WLAN_FC_STYPE_AUTH:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth\n");
		handle_auth(hapd, mgmt, len);
		break;
	case WLAN_FC_STYPE_ASSOC_REQ:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_req\n");
		handle_assoc(hapd, mgmt, len, 0);
		break;
	case WLAN_FC_STYPE_ASSOC_RESP:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_resp\n");
		handle_assoc_resp(hapd, mgmt, len);
		break;
	case WLAN_FC_STYPE_REASSOC_REQ:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::reassoc_req\n");
		handle_assoc(hapd, mgmt, len, 1);
		break;
	case WLAN_FC_STYPE_DISASSOC:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::disassoc\n");
		handle_disassoc(hapd, mgmt, len);
		break;
	case WLAN_FC_STYPE_DEAUTH:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::deauth\n");
		handle_deauth(hapd, mgmt, len);
		break;
	default:
		printf("unknown mgmt frame subtype %d\n", stype);
		break;
	}
}


static void handle_auth_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			   size_t len, int ok)
{
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

	if (!ok) {
		hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_NOTICE,
			       "did not acknowledge authentication response");
		return;
	}

	if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
		printf("handle_auth_cb - too short payload (len=%lu)\n",
		       (unsigned long) len);
		return;
	}

	auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
	auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
	status_code = le_to_host16(mgmt->u.auth.status_code);

	sta = ap_get_sta(hapd, mgmt->da);
	if (!sta) {
		printf("handle_auth_cb: STA " MACSTR " not found\n",
		       MAC2STR(mgmt->da));
		return;
	}

	if (status_code == WLAN_STATUS_SUCCESS &&
	    ((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 2) ||
	     (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 4))) {
		hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_INFO, "authenticated");
		sta->flags |= WLAN_STA_AUTH;
	}
}


static void handle_assoc_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
			    size_t len, int reassoc, int ok)
{
	u16 status;
	struct sta_info *sta;
	int new_assoc = 1;

	if (!ok) {
		hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
			       HOSTAPD_LEVEL_DEBUG,
			       "did not acknowledge association response");
		return;
	}

	if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
				      sizeof(mgmt->u.assoc_req))) {
		printf("handle_assoc_cb(reassoc=%d) - too short payload "
		       "(len=%lu)\n", reassoc, (unsigned long) len);
		return;
	}

	if (reassoc)
		status = le_to_host16(mgmt->u.reassoc_resp.status_code);
	else
		status = le_to_host16(mgmt->u.assoc_resp.status_code);

	sta = ap_get_sta(hapd, mgmt->da);
	if (!sta) {
		printf("handle_assoc_cb: STA " MACSTR " not found\n",
		       MAC2STR(mgmt->da));
		return;
	}

	if (status != WLAN_STATUS_SUCCESS)
		goto fail;

	/* Stop previous accounting session, if one is started, and allocate
	 * new session id for the new session. */
	accounting_sta_stop(hapd, sta);
	accounting_sta_get_id(hapd, sta);

	hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_INFO,
		       "associated (aid %d, accounting session %08X-%08X)",
		       sta->aid, sta->acct_session_id_hi,
		       sta->acct_session_id_lo);

	if (sta->flags & WLAN_STA_ASSOC)
		new_assoc = 0;
	sta->flags |= WLAN_STA_ASSOC;

	if (hostapd_sta_add(hapd, sta->addr, sta->aid, sta->capability,
			    sta->tx_supp_rates)) {
		printf("Could not add station to kernel driver.\n");
	}

	wpa_sm_event(hapd, sta, WPA_ASSOC);
	if (new_assoc)
		hostapd_new_assoc_sta(hapd, sta);
	else
		wpa_sm_event(hapd, sta, WPA_REAUTH);

	ieee802_1x_notify_port_enabled(sta->eapol_sm, 1);

 fail:
	/* Copy of the association request is not needed anymore */
	if (sta->last_assoc_req) {
		free(sta->last_assoc_req);
		sta->last_assoc_req = NULL;
	}
}


void ieee802_11_mgmt_cb(struct hostapd_data *hapd, u8 *buf, size_t len,
			u16 stype, int ok)
{
	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;

	switch (stype) {
	case WLAN_FC_STYPE_AUTH:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth cb\n");
		handle_auth_cb(hapd, mgmt, len, ok);
		break;
	case WLAN_FC_STYPE_ASSOC_RESP:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
			      "mgmt::assoc_resp cb\n");
		handle_assoc_cb(hapd, mgmt, len, 0, ok);
		break;
	case WLAN_FC_STYPE_REASSOC_RESP:
		HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
			      "mgmt::reassoc_resp cb\n");
		handle_assoc_cb(hapd, mgmt, len, 1, ok);
		break;
	default:
		printf("unknown mgmt cb frame subtype %d\n", stype);
		break;
	}
}


static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
						void *timeout_ctx)
{
	struct hostapd_data *hapd = eloop_ctx;
	hapd->tkip_countermeasures = 0;
	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
}


static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
{
	struct sta_info *sta;

	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
		       HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");

	if (hapd->wpa_auth)
		hapd->wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
	hapd->tkip_countermeasures = 1;
	wpa_gtk_rekey(hapd);
	eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
	eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
			       hapd, NULL);
	for (sta = hapd->sta_list; sta != NULL; sta = sta->next) {
		hostapd_sta_deauth(hapd, sta->addr,
				   WLAN_REASON_MICHAEL_MIC_FAILURE);
		sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
				WLAN_STA_AUTHORIZED);
		hostapd_sta_remove(hapd, sta->addr);
	}
}


void ieee80211_michael_mic_failure(struct hostapd_data *hapd, u8 *addr,
				   int local)
{
	time_t now;

	if (addr && local) {
		struct sta_info *sta = ap_get_sta(hapd, addr);
		if (sta != NULL) {
			sta->dot11RSNAStatsTKIPLocalMICFailures++;
			hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
				       HOSTAPD_LEVEL_INFO,
				       "Michael MIC failure detected in "
				       "received frame");
		} else {
			HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
				      "MLME-MICHAELMICFAILURE.indication "
				      "for not associated STA (" MACSTR
				      ") ignored\n", MAC2STR(addr));
			return;
		}
	}

	time(&now);
	if (now > hapd->michael_mic_failure + 60) {
		hapd->michael_mic_failures = 1;
	} else {
		hapd->michael_mic_failures++;
		if (hapd->michael_mic_failures > 1)
			ieee80211_tkip_countermeasures_start(hapd);
	}
	hapd->michael_mic_failure = now;
}


int ieee802_11_get_mib(struct hostapd_data *hapd, char *buf, size_t buflen)
{
	/* TODO */
	return 0;
}


int ieee802_11_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
			   char *buf, size_t buflen)
{
	/* TODO */
	return 0;
}