hostap/src/ap/tkip_countermeasures.c

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/*
* hostapd / TKIP countermeasures
* Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "radius/radius.h"
#include "hostapd.h"
#include "sta_info.h"
#include "ap_mlme.h"
#include "wpa_auth.h"
#include "ap_drv_ops.h"
2009-01-11 09:42:07 +01:00
#include "tkip_countermeasures.h"
static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
void *timeout_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
hapd->tkip_countermeasures = 0;
hostapd_drv_set_countermeasures(hapd, 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");
wpa_auth_countermeasures_start(hapd->wpa_auth);
hapd->tkip_countermeasures = 1;
hostapd_drv_set_countermeasures(hapd, 1);
wpa_gtk_rekey(hapd->wpa_auth);
eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
hapd, NULL);
while ((sta = hapd->sta_list)) {
sta->acct_terminate_cause =
RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_RESET;
if (sta->flags & WLAN_STA_AUTH) {
mlme_deauthenticate_indication(
hapd, sta,
WLAN_REASON_MICHAEL_MIC_FAILURE);
}
hostapd_drv_sta_deauth(hapd, sta->addr,
WLAN_REASON_MICHAEL_MIC_FAILURE);
ap_free_sta(hapd, sta);
}
}
void ieee80211_tkip_countermeasures_deinit(struct hostapd_data *hapd)
{
eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
}
int michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
{
struct os_reltime now;
int ret = 0;
if (addr && local) {
struct sta_info *sta = ap_get_sta(hapd, addr);
if (sta != NULL) {
wpa_auth_sta_local_mic_failure_report(sta->wpa_sm);
hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO,
"Michael MIC failure detected in "
"received frame");
mlme_michaelmicfailure_indication(hapd, addr);
} else {
wpa_printf(MSG_DEBUG,
"MLME-MICHAELMICFAILURE.indication "
"for not associated STA (" MACSTR
") ignored", MAC2STR(addr));
return ret;
}
}
os_get_reltime(&now);
if (os_reltime_expired(&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);
ret = 1;
}
}
hapd->michael_mic_failure = now;
return ret;
}