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hostapd/wpa_supplicant/events.c
Jouni Malinen 48563d86b2 Try to avoid some unnecessary roaming 
When multiple APs are present in scan results with similar signal
strength, wpa_supplicant may end up bounching between them frequently
whenever new scan results are available (e.g., due to periodic scans
requested by NetworkManager). This can result in unnecessary roaming
and in case of the current cfg80211 version, to frequent network
disconnections.

Do not request a roam if the current BSS is still present in the scan
results and the selected BSS is in the same ESS and has only a slighly
stronger signal strength.
2010-01-24 18:19:50 -08:00

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/*
* WPA Supplicant - Driver event processing
* Copyright (c) 2003-2010, 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"
#include "common.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "rsn_supp/wpa.h"
#include "eloop.h"
#include "config.h"
#include "l2_packet/l2_packet.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "pcsc_funcs.h"
#include "rsn_supp/preauth.h"
#include "rsn_supp/pmksa_cache.h"
#include "common/wpa_ctrl.h"
#include "eap_peer/eap.h"
#include "ap/hostapd.h"
#include "notify.h"
#include "common/ieee802_11_defs.h"
#include "blacklist.h"
#include "wpas_glue.h"
#include "wps_supplicant.h"
#include "ibss_rsn.h"
#include "sme.h"
#include "bgscan.h"
#include "ap.h"
#include "bss.h"
#include "mlme.h"
#include "scan.h"
static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid, *old_ssid;
if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
return 0;
wpa_printf(MSG_DEBUG, "Select network based on association "
"information");
ssid = wpa_supplicant_get_ssid(wpa_s);
if (ssid == NULL) {
wpa_printf(MSG_INFO, "No network configuration found for the "
"current AP");
return -1;
}
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, "Selected network is disabled");
return -1;
}
wpa_printf(MSG_DEBUG, "Network configuration found for the current "
"AP");
if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
WPA_KEY_MGMT_WPA_NONE |
WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X |
WPA_KEY_MGMT_PSK_SHA256 |
WPA_KEY_MGMT_IEEE8021X_SHA256)) {
u8 wpa_ie[80];
size_t wpa_ie_len = sizeof(wpa_ie);
wpa_supplicant_set_suites(wpa_s, NULL, ssid,
wpa_ie, &wpa_ie_len);
} else {
wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
}
if (wpa_s->current_ssid && wpa_s->current_ssid != ssid)
eapol_sm_invalidate_cached_session(wpa_s->eapol);
old_ssid = wpa_s->current_ssid;
wpa_s->current_ssid = ssid;
wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
wpa_supplicant_initiate_eapol(wpa_s);
if (old_ssid != wpa_s->current_ssid)
wpas_notify_network_changed(wpa_s);
return 0;
}
static void wpa_supplicant_stop_countermeasures(void *eloop_ctx,
void *sock_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
if (wpa_s->countermeasures) {
wpa_s->countermeasures = 0;
wpa_drv_set_countermeasures(wpa_s, 0);
wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped");
wpa_supplicant_req_scan(wpa_s, 0, 0);
}
}
void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
{
int bssid_changed;
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
os_memset(wpa_s->bssid, 0, ETH_ALEN);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
if (bssid_changed)
wpas_notify_bssid_changed(wpa_s);
eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt))
eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
wpa_s->ap_ies_from_associnfo = 0;
}
static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
{
struct wpa_ie_data ie;
int pmksa_set = -1;
size_t i;
if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
ie.pmkid == NULL)
return;
for (i = 0; i < ie.num_pmkid; i++) {
pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
ie.pmkid + i * PMKID_LEN,
NULL, NULL, 0);
if (pmksa_set == 0) {
eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
break;
}
}
wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
"cache", pmksa_set == 0 ? "" : "not ");
}
static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL) {
wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
return;
}
wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
" index=%d preauth=%d",
MAC2STR(data->pmkid_candidate.bssid),
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
}
static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
{
if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
return 0;
#ifdef IEEE8021X_EAPOL
if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
wpa_s->current_ssid &&
!(wpa_s->current_ssid->eapol_flags &
(EAPOL_FLAG_REQUIRE_KEY_UNICAST |
EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
/* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
* plaintext or static WEP keys). */
return 0;
}
#endif /* IEEE8021X_EAPOL */
return 1;
}
/**
* wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
* @wpa_s: pointer to wpa_supplicant data
* @ssid: Configuration data for the network
* Returns: 0 on success, -1 on failure
*
* This function is called when starting authentication with a network that is
* configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
*/
int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
#ifdef IEEE8021X_EAPOL
int aka = 0, sim = 0, type;
if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL)
return 0;
if (ssid->eap.eap_methods == NULL) {
sim = 1;
aka = 1;
} else {
struct eap_method_type *eap = ssid->eap.eap_methods;
while (eap->vendor != EAP_VENDOR_IETF ||
eap->method != EAP_TYPE_NONE) {
if (eap->vendor == EAP_VENDOR_IETF) {
if (eap->method == EAP_TYPE_SIM)
sim = 1;
else if (eap->method == EAP_TYPE_AKA)
aka = 1;
}
eap++;
}
}
if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
sim = 0;
if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
aka = 0;
if (!sim && !aka) {
wpa_printf(MSG_DEBUG, "Selected network is configured to use "
"SIM, but neither EAP-SIM nor EAP-AKA are enabled");
return 0;
}
wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
"(sim=%d aka=%d) - initialize PCSC", sim, aka);
if (sim && aka)
type = SCARD_TRY_BOTH;
else if (aka)
type = SCARD_USIM_ONLY;
else
type = SCARD_GSM_SIM_ONLY;
wpa_s->scard = scard_init(type);
if (wpa_s->scard == NULL) {
wpa_printf(MSG_WARNING, "Failed to initialize SIM "
"(pcsc-lite)");
return -1;
}
wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
#endif /* IEEE8021X_EAPOL */
return 0;
}
#ifndef CONFIG_NO_SCAN_PROCESSING
static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss,
struct wpa_ssid *ssid)
{
int i, privacy = 0;
if (ssid->mixed_cell)
return 1;
#ifdef CONFIG_WPS
if (ssid->key_mgmt & WPA_KEY_MGMT_WPS)
return 1;
#endif /* CONFIG_WPS */
for (i = 0; i < NUM_WEP_KEYS; i++) {
if (ssid->wep_key_len[i]) {
privacy = 1;
break;
}
}
#ifdef IEEE8021X_EAPOL
if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
privacy = 1;
#endif /* IEEE8021X_EAPOL */
if (bss->caps & IEEE80211_CAP_PRIVACY)
return privacy;
return !privacy;
}
static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid,
struct wpa_scan_res *bss)
{
struct wpa_ie_data ie;
int proto_match = 0;
const u8 *rsn_ie, *wpa_ie;
int ret;
ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss);
if (ret >= 0)
return ret;
rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) {
proto_match++;
if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed");
break;
}
if (!(ie.proto & ssid->proto)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - proto "
"mismatch");
break;
}
if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher "
"mismatch");
break;
}
if (!(ie.group_cipher & ssid->group_cipher)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher "
"mismatch");
break;
}
if (!(ie.key_mgmt & ssid->key_mgmt)) {
wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt "
"mismatch");
break;
}
#ifdef CONFIG_IEEE80211W
if (!(ie.capabilities & WPA_CAPABILITY_MFPC) &&
ssid->ieee80211w == MGMT_FRAME_PROTECTION_REQUIRED) {
wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame "
"protection");
break;
}
#endif /* CONFIG_IEEE80211W */
wpa_printf(MSG_DEBUG, " selected based on RSN IE");
return 1;
}
wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) {
proto_match++;
if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed");
break;
}
if (!(ie.proto & ssid->proto)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - proto "
"mismatch");
break;
}
if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher "
"mismatch");
break;
}
if (!(ie.group_cipher & ssid->group_cipher)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher "
"mismatch");
break;
}
if (!(ie.key_mgmt & ssid->key_mgmt)) {
wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt "
"mismatch");
break;
}
wpa_printf(MSG_DEBUG, " selected based on WPA IE");
return 1;
}
if (proto_match == 0)
wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match");
return 0;
}
static struct wpa_bss *
wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_ssid *ssid;
struct wpa_scan_res *bss;
size_t i;
struct wpa_blacklist *e;
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
for (i = 0; i < scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
ssid_len = ie ? ie[1] : 0;
ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
wpa_ie_len = ie ? ie[1] : 0;
ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
rsn_ie_len = ie ? ie[1] : 0;
wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
"wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
(int) i, MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len),
wpa_ie_len, rsn_ie_len, bss->caps);
e = wpa_blacklist_get(wpa_s, bss->bssid);
if (e && e->count > 1) {
wpa_printf(MSG_DEBUG, " skip - blacklisted");
continue;
}
if (ssid_len == 0) {
wpa_printf(MSG_DEBUG, " skip - SSID not known");
continue;
}
if (wpa_ie_len == 0 && rsn_ie_len == 0) {
wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE");
continue;
}
for (ssid = group; ssid; ssid = ssid->pnext) {
int check_ssid = 1;
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, " skip - disabled");
continue;
}
#ifdef CONFIG_WPS
if (ssid->ssid_len == 0 &&
wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss))
check_ssid = 0;
#endif /* CONFIG_WPS */
if (check_ssid &&
(ssid_len != ssid->ssid_len ||
os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"SSID mismatch");
continue;
}
if (ssid->bssid_set &&
os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
{
wpa_printf(MSG_DEBUG, " skip - "
"BSSID mismatch");
continue;
}
if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss))
continue;
wpa_printf(MSG_DEBUG, " selected WPA AP "
MACSTR " ssid='%s'",
MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len));
*selected_ssid = ssid;
return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len);
}
}
return NULL;
}
static struct wpa_bss *
wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_ssid *ssid;
struct wpa_scan_res *bss;
size_t i;
struct wpa_blacklist *e;
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
for (i = 0; i < scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
ssid_len = ie ? ie[1] : 0;
ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
wpa_ie_len = ie ? ie[1] : 0;
ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
rsn_ie_len = ie ? ie[1] : 0;
wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
"wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
(int) i, MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len),
wpa_ie_len, rsn_ie_len, bss->caps);
e = wpa_blacklist_get(wpa_s, bss->bssid);
if (e && e->count > 1) {
wpa_printf(MSG_DEBUG, " skip - blacklisted");
continue;
}
if (ssid_len == 0) {
wpa_printf(MSG_DEBUG, " skip - SSID not known");
continue;
}
for (ssid = group; ssid; ssid = ssid->pnext) {
int check_ssid = ssid->ssid_len != 0;
if (ssid->disabled) {
wpa_printf(MSG_DEBUG, " skip - disabled");
continue;
}
#ifdef CONFIG_WPS
if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
/* Only allow wildcard SSID match if an AP
* advertises active WPS operation that matches
* with our mode. */
check_ssid = 1;
if (ssid->ssid_len == 0 &&
wpas_wps_ssid_wildcard_ok(wpa_s, ssid,
bss))
check_ssid = 0;
}
#endif /* CONFIG_WPS */
if (check_ssid &&
(ssid_len != ssid->ssid_len ||
os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"SSID mismatch");
continue;
}
if (ssid->bssid_set &&
os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
{
wpa_printf(MSG_DEBUG, " skip - "
"BSSID mismatch");
continue;
}
if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
!(ssid->key_mgmt & WPA_KEY_MGMT_WPS) &&
!(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
{
wpa_printf(MSG_DEBUG, " skip - "
"non-WPA network not allowed");
continue;
}
if ((ssid->key_mgmt &
(WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
WPA_KEY_MGMT_IEEE8021X_SHA256 |
WPA_KEY_MGMT_PSK_SHA256)) &&
(wpa_ie_len != 0 || rsn_ie_len != 0)) {
wpa_printf(MSG_DEBUG, " skip - "
"WPA network");
continue;
}
if (!wpa_supplicant_match_privacy(bss, ssid)) {
wpa_printf(MSG_DEBUG, " skip - "
"privacy mismatch");
continue;
}
if (bss->caps & IEEE80211_CAP_IBSS) {
wpa_printf(MSG_DEBUG, " skip - "
"IBSS (adhoc) network");
continue;
}
wpa_printf(MSG_DEBUG, " selected non-WPA AP "
MACSTR " ssid='%s'",
MAC2STR(bss->bssid),
wpa_ssid_txt(ssid_, ssid_len));
*selected_ssid = ssid;
return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len);
}
}
return NULL;
}
static struct wpa_bss *
wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_bss *selected;
wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
group->priority);
/* First, try to find WPA-enabled AP */
selected = wpa_supplicant_select_bss_wpa(wpa_s, scan_res, group,
selected_ssid);
if (selected)
return selected;
/* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
* allows this. */
return wpa_supplicant_select_bss_non_wpa(wpa_s, scan_res, group,
selected_ssid);
}
static struct wpa_bss *
wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid **selected_ssid)
{
struct wpa_bss *selected = NULL;
int prio;
while (selected == NULL) {
for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
selected = wpa_supplicant_select_bss(
wpa_s, scan_res, wpa_s->conf->pssid[prio],
selected_ssid);
if (selected)
break;
}
if (selected == NULL && wpa_s->blacklist) {
wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
"and try again");
wpa_blacklist_clear(wpa_s);
wpa_s->blacklist_cleared++;
} else if (selected == NULL)
break;
}
return selected;
}
static void wpa_supplicant_req_new_scan(struct wpa_supplicant *wpa_s,
int timeout)
{
if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
/*
* Quick recovery if the initial scan results were not
* complete when fetched before the first scan request.
*/
wpa_s->scan_res_tried++;
timeout = 0;
} else if (!wpa_supplicant_enabled_networks(wpa_s->conf)) {
/*
* No networks are enabled; short-circuit request so
* we don't wait timeout seconds before transitioning
* to INACTIVE state.
*/
wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
return;
}
wpa_supplicant_req_scan(wpa_s, timeout, 0);
}
static void wpa_supplicant_connect(struct wpa_supplicant *wpa_s,
struct wpa_bss *selected,
struct wpa_ssid *ssid)
{
if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) {
wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP
"PBC session overlap");
wpa_supplicant_req_new_scan(wpa_s, 10);
return;
}
/*
* Do not trigger new association unless the BSSID has changed or if
* reassociation is requested. If we are in process of associating with
* the selected BSSID, do not trigger new attempt.
*/
if (wpa_s->reassociate ||
(os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
(wpa_s->wpa_state != WPA_ASSOCIATING ||
os_memcmp(selected->bssid, wpa_s->pending_bssid, ETH_ALEN) !=
0))) {
if (wpa_supplicant_scard_init(wpa_s, ssid)) {
wpa_supplicant_req_new_scan(wpa_s, 10);
return;
}
wpa_supplicant_associate(wpa_s, selected, ssid);
} else {
wpa_printf(MSG_DEBUG, "Already associated with the selected "
"AP");
}
}
static struct wpa_ssid *
wpa_supplicant_pick_new_network(struct wpa_supplicant *wpa_s)
{
int prio;
struct wpa_ssid *ssid;
for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
for (ssid = wpa_s->conf->pssid[prio]; ssid; ssid = ssid->pnext)
{
if (ssid->disabled)
continue;
if (ssid->mode == IEEE80211_MODE_IBSS ||
ssid->mode == IEEE80211_MODE_AP)
return ssid;
}
}
return NULL;
}
/* TODO: move the rsn_preauth_scan_result*() to be called from notify.c based
* on BSS added and BSS changed events */
static void wpa_supplicant_rsn_preauth_scan_results(
struct wpa_supplicant *wpa_s, struct wpa_scan_results *scan_res)
{
int i;
if (rsn_preauth_scan_results(wpa_s->wpa) < 0)
return;
for (i = scan_res->num - 1; i >= 0; i--) {
const u8 *ssid, *rsn;
struct wpa_scan_res *r;
r = scan_res->res[i];
ssid = wpa_scan_get_ie(r, WLAN_EID_SSID);
if (ssid == NULL)
continue;
rsn = wpa_scan_get_ie(r, WLAN_EID_RSN);
if (rsn == NULL)
continue;
rsn_preauth_scan_result(wpa_s->wpa, r->bssid, ssid, rsn);
}
}
static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
struct wpa_bss *selected,
struct wpa_ssid *ssid,
struct wpa_scan_results *scan_res)
{
size_t i;
struct wpa_scan_res *current_bss = NULL;
int min_diff;
if (wpa_s->reassociate)
return 1; /* explicit request to reassociate */
if (wpa_s->wpa_state < WPA_ASSOCIATED)
return 1; /* we are not associated; continue */
if (wpa_s->current_ssid == NULL)
return 1; /* unknown current SSID */
if (wpa_s->current_ssid != ssid)
return 1; /* different network block */
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *res = scan_res->res[i];
const u8 *ie;
if (os_memcmp(res->bssid, wpa_s->bssid, ETH_ALEN) != 0)
continue;
ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
if (ie == NULL)
continue;
if (ie[1] != wpa_s->current_ssid->ssid_len ||
os_memcmp(ie + 2, wpa_s->current_ssid->ssid, ie[1]) != 0)
continue;
current_bss = res;
break;
}
if (!current_bss)
return 1; /* current BSS not seen in scan results */
wpa_printf(MSG_DEBUG, "Considering within-ESS reassociation");
wpa_printf(MSG_DEBUG, "Current BSS: " MACSTR " level=%d",
MAC2STR(current_bss->bssid), current_bss->level);
wpa_printf(MSG_DEBUG, "Selected BSS: " MACSTR " level=%d",
MAC2STR(selected->bssid), selected->level);
min_diff = 2;
if (current_bss->level < 0) {
if (current_bss->level < -85)
min_diff = 1;
else if (current_bss->level < -80)
min_diff = 2;
else if (current_bss->level < -75)
min_diff = 3;
else if (current_bss->level < -70)
min_diff = 4;
else
min_diff = 5;
}
if (abs(current_bss->level - selected->level) < min_diff) {
wpa_printf(MSG_DEBUG, "Skip roam - too small difference in "
"signal level");
return 0;
}
return 1;
}
static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
struct wpa_bss *selected;
struct wpa_ssid *ssid = NULL;
struct wpa_scan_results *scan_res;
wpa_supplicant_notify_scanning(wpa_s, 0);
scan_res = wpa_supplicant_get_scan_results(wpa_s,
data ? &data->scan_info :
NULL, 1);
if (scan_res == NULL) {
if (wpa_s->conf->ap_scan == 2)
return;
wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
"scanning again");
wpa_supplicant_req_new_scan(wpa_s, 1);
return;
}
/*
* Don't post the results if this was the initial cached
* and there were no results.
*/
if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
scan_res->num == 0) {
wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
"empty - not posting");
} else {
wpa_printf(MSG_DEBUG, "New scan results available");
wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
wpas_notify_scan_results(wpa_s);
}
wpas_notify_scan_done(wpa_s, 1);
if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) {
wpa_scan_results_free(scan_res);
return;
}
if (wpa_s->disconnected) {
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
wpa_scan_results_free(scan_res);
return;
}
if (bgscan_notify_scan(wpa_s) == 1) {
wpa_scan_results_free(scan_res);
return;
}
wpa_supplicant_rsn_preauth_scan_results(wpa_s, scan_res);
selected = wpa_supplicant_pick_network(wpa_s, scan_res, &ssid);
if (selected) {
int skip;
skip = !wpa_supplicant_need_to_roam(wpa_s, selected, ssid,
scan_res);
wpa_scan_results_free(scan_res);
if (skip)
return;
wpa_supplicant_connect(wpa_s, selected, ssid);
} else {
wpa_scan_results_free(scan_res);
wpa_printf(MSG_DEBUG, "No suitable network found");
ssid = wpa_supplicant_pick_new_network(wpa_s);
if (ssid) {
wpa_printf(MSG_DEBUG, "Setup a new network");
wpa_supplicant_associate(wpa_s, NULL, ssid);
} else
wpa_supplicant_req_new_scan(wpa_s, 5);
}
}
#endif /* CONFIG_NO_SCAN_PROCESSING */
#ifdef CONFIG_IEEE80211R
static void wpa_assoc_set_ft_params(struct wpa_supplicant *wpa_s,
const u8 *ftie, const u8 *mdie)
{
const u8 *mobility_domain = NULL;
const u8 *r0kh_id = NULL;
size_t r0kh_id_len = 0;
const u8 *r1kh_id = NULL;
struct rsn_ftie *hdr;
const u8 *pos, *end;
if (mdie == NULL || ftie == NULL)
return;
if (mdie[1] >= MOBILITY_DOMAIN_ID_LEN) {
mobility_domain = mdie + 2;
#ifdef CONFIG_SME
wpa_s->sme.ft_used = 1;
os_memcpy(wpa_s->sme.mobility_domain, mobility_domain, 2);
#endif /* CONFIG_SME */
}
if (ftie[1] >= sizeof(struct rsn_ftie)) {
end = ftie + 2 + ftie[1];
hdr = (struct rsn_ftie *) (ftie + 2);
pos = (const u8 *) (hdr + 1);
while (pos + 1 < end) {
if (pos + 2 + pos[1] > end)
break;
if (pos[0] == FTIE_SUBELEM_R1KH_ID &&
pos[1] == FT_R1KH_ID_LEN)
r1kh_id = pos + 2;
else if (pos[0] == FTIE_SUBELEM_R0KH_ID &&
pos[1] >= 1 && pos[1] <= FT_R0KH_ID_MAX_LEN) {
r0kh_id = pos + 2;
r0kh_id_len = pos[1];
}
pos += 2 + pos[1];
}
}
wpa_sm_set_ft_params(wpa_s->wpa, mobility_domain, r0kh_id,
r0kh_id_len, r1kh_id);
}
#endif /* CONFIG_IEEE80211R */
static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
int l, len, found = 0, wpa_found, rsn_found;
const u8 *p;
#ifdef CONFIG_IEEE80211R
const u8 *mdie = NULL, *ftie = NULL;
#endif /* CONFIG_IEEE80211R */
wpa_printf(MSG_DEBUG, "Association info event");
if (data->assoc_info.req_ies)
wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
data->assoc_info.req_ies_len);
if (data->assoc_info.resp_ies)
wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
data->assoc_info.resp_ies_len);
if (data->assoc_info.beacon_ies)
wpa_hexdump(MSG_DEBUG, "beacon_ies",
data->assoc_info.beacon_ies,
data->assoc_info.beacon_ies_len);
if (data->assoc_info.freq)
wpa_printf(MSG_DEBUG, "freq=%u MHz", data->assoc_info.freq);
p = data->assoc_info.req_ies;
l = data->assoc_info.req_ies_len;
/* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
while (p && l >= 2) {
len = p[1] + 2;
if (len > l) {
wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
p, l);
break;
}
if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
(os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
(p[0] == WLAN_EID_RSN && p[1] >= 2)) {
if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
break;
found = 1;
wpa_find_assoc_pmkid(wpa_s);
break;
}
l -= len;
p += len;
}
if (!found && data->assoc_info.req_ies)
wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
#ifdef CONFIG_IEEE80211R
p = data->assoc_info.resp_ies;
l = data->assoc_info.resp_ies_len;
/* Go through the IEs and make a copy of the FT/MD IE, if present. */
while (p && l >= 2) {
len = p[1] + 2;
if (len > l) {
wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
p, l);
break;
}
if (p[0] == WLAN_EID_FAST_BSS_TRANSITION)
ftie = p;
else if (p[0] == WLAN_EID_MOBILITY_DOMAIN)
mdie = p;
l -= len;
p += len;
}
wpa_assoc_set_ft_params(wpa_s, ftie, mdie);
#endif /* CONFIG_IEEE80211R */
/* WPA/RSN IE from Beacon/ProbeResp */
p = data->assoc_info.beacon_ies;
l = data->assoc_info.beacon_ies_len;
/* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
*/
wpa_found = rsn_found = 0;
while (p && l >= 2) {
len = p[1] + 2;
if (len > l) {
wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
p, l);
break;
}
if (!wpa_found &&
p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
wpa_found = 1;
wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
}
if (!rsn_found &&
p[0] == WLAN_EID_RSN && p[1] >= 2) {
rsn_found = 1;
wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
}
l -= len;
p += len;
}
if (!wpa_found && data->assoc_info.beacon_ies)
wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
if (!rsn_found && data->assoc_info.beacon_ies)
wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
if (wpa_found || rsn_found)
wpa_s->ap_ies_from_associnfo = 1;
wpa_s->assoc_freq = data->assoc_info.freq;
}
static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
u8 bssid[ETH_ALEN];
int ft_completed;
int bssid_changed;
struct wpa_driver_capa capa;
#ifdef CONFIG_AP
if (wpa_s->ap_iface) {
hostapd_notif_assoc(wpa_s->ap_iface->bss[0],
data->assoc_info.addr,
data->assoc_info.req_ies,
data->assoc_info.req_ies_len);
return;
}
#endif /* CONFIG_AP */
ft_completed = wpa_ft_is_completed(wpa_s->wpa);
if (data)
wpa_supplicant_event_associnfo(wpa_s, data);
wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) ||
(wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
MACSTR, MAC2STR(bssid));
bssid_changed = os_memcmp(wpa_s->bssid, bssid, ETH_ALEN);
os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
if (bssid_changed)
wpas_notify_bssid_changed(wpa_s);
if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
wpa_clear_keys(wpa_s, bssid);
}
if (wpa_supplicant_select_config(wpa_s) < 0) {
wpa_supplicant_disassociate(
wpa_s, WLAN_REASON_DEAUTH_LEAVING);
return;
}
if (wpa_s->current_ssid) {
struct wpa_bss *bss = NULL;
struct wpa_ssid *ssid = wpa_s->current_ssid;
if (ssid->ssid_len > 0)
bss = wpa_bss_get(wpa_s, bssid,
ssid->ssid, ssid->ssid_len);
if (!bss)
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (bss)
wpa_s->current_bss = bss;
}
}
#ifdef CONFIG_SME
os_memcpy(wpa_s->sme.prev_bssid, bssid, ETH_ALEN);
wpa_s->sme.prev_bssid_set = 1;
#endif /* CONFIG_SME */
wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
if (wpa_s->current_ssid) {
/* When using scanning (ap_scan=1), SIM PC/SC interface can be
* initialized before association, but for other modes,
* initialize PC/SC here, if the current configuration needs
* smartcard or SIM/USIM. */
wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
}
wpa_sm_notify_assoc(wpa_s->wpa, bssid);
l2_packet_notify_auth_start(wpa_s->l2);
/*
* Set portEnabled first to FALSE in order to get EAP state machine out
* of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
* state machine may transit to AUTHENTICATING state based on obsolete
* eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
* AUTHENTICATED without ever giving chance to EAP state machine to
* reset the state.
*/
if (!ft_completed) {
eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
}
if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
/* 802.1X::portControl = Auto */
eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
wpa_s->eapol_received = 0;
if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE ||
(wpa_s->current_ssid &&
wpa_s->current_ssid->mode == IEEE80211_MODE_IBSS)) {
wpa_supplicant_cancel_auth_timeout(wpa_s);
wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
} else if (!ft_completed) {
/* Timeout for receiving the first EAPOL packet */
wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
}
wpa_supplicant_cancel_scan(wpa_s);
if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE) &&
wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
/*
* We are done; the driver will take care of RSN 4-way
* handshake.
*/
wpa_supplicant_cancel_auth_timeout(wpa_s);
wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
}
if (wpa_s->pending_eapol_rx) {
struct os_time now, age;
os_get_time(&now);
os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age);
if (age.sec == 0 && age.usec < 100000 &&
os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) ==
0) {
wpa_printf(MSG_DEBUG, "Process pending EAPOL frame "
"that was received just before association "
"notification");
wpa_supplicant_rx_eapol(
wpa_s, wpa_s->pending_eapol_rx_src,
wpabuf_head(wpa_s->pending_eapol_rx),
wpabuf_len(wpa_s->pending_eapol_rx));
}
wpabuf_free(wpa_s->pending_eapol_rx);
wpa_s->pending_eapol_rx = NULL;
}
#ifdef CONFIG_BGSCAN
if (wpa_s->current_ssid != wpa_s->bgscan_ssid) {
bgscan_deinit(wpa_s);
if (wpa_s->current_ssid && wpa_s->current_ssid->bgscan) {
if (bgscan_init(wpa_s, wpa_s->current_ssid)) {
wpa_printf(MSG_DEBUG, "Failed to initialize "
"bgscan");
/*
* Live without bgscan; it is only used as a
* roaming optimization, so the initial
* connection is not affected.
*/
} else
wpa_s->bgscan_ssid = wpa_s->current_ssid;
} else
wpa_s->bgscan_ssid = NULL;
}
#endif /* CONFIG_BGSCAN */
if ((wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
wpa_s->current_ssid && wpa_drv_get_capa(wpa_s, &capa) == 0 &&
capa.flags & WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE) {
/* Set static WEP keys again */
wpa_set_wep_keys(wpa_s, wpa_s->current_ssid);
}
}
static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
{
const u8 *bssid;
#ifdef CONFIG_SME
int authenticating;
u8 prev_pending_bssid[ETH_ALEN];
authenticating = wpa_s->wpa_state == WPA_AUTHENTICATING;
os_memcpy(prev_pending_bssid, wpa_s->pending_bssid, ETH_ALEN);
#endif /* CONFIG_SME */
if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
/*
* At least Host AP driver and a Prism3 card seemed to be
* generating streams of disconnected events when configuring
* IBSS for WPA-None. Ignore them for now.
*/
wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
"IBSS/WPA-None mode");
return;
}
if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
"pre-shared key may be incorrect");
}
if (wpa_s->wpa_state >= WPA_ASSOCIATED)
wpa_supplicant_req_scan(wpa_s, 0, 100000);
bssid = wpa_s->bssid;
if (is_zero_ether_addr(bssid))
bssid = wpa_s->pending_bssid;
wpa_blacklist_add(wpa_s, bssid);
wpa_sm_notify_disassoc(wpa_s->wpa);
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
"remove keys");
if (wpa_supplicant_dynamic_keys(wpa_s)) {
wpa_s->keys_cleared = 0;
wpa_clear_keys(wpa_s, wpa_s->bssid);
}
wpa_supplicant_mark_disassoc(wpa_s);
bgscan_deinit(wpa_s);
#ifdef CONFIG_SME
if (authenticating &&
(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) {
/*
* mac80211-workaround to force deauth on failed auth cmd,
* requires us to remain in authenticating state to allow the
* second authentication attempt to be continued properly.
*/
wpa_printf(MSG_DEBUG, "SME: Allow pending authentication to "
"proceed after disconnection event");
wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
os_memcpy(wpa_s->pending_bssid, prev_pending_bssid, ETH_ALEN);
}
#endif /* CONFIG_SME */
}
#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx,
void *sock_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
if (!wpa_s->pending_mic_error_report)
return;
wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report");
wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise);
wpa_s->pending_mic_error_report = 0;
}
#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
static void
wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
int pairwise;
struct os_time t;
wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
pairwise = (data && data->michael_mic_failure.unicast);
os_get_time(&t);
if ((wpa_s->last_michael_mic_error &&
t.sec - wpa_s->last_michael_mic_error <= 60) ||
wpa_s->pending_mic_error_report) {
if (wpa_s->pending_mic_error_report) {
/*
* Send the pending MIC error report immediately since
* we are going to start countermeasures and AP better
* do the same.
*/
wpa_sm_key_request(wpa_s->wpa, 1,
wpa_s->pending_mic_error_pairwise);
}
/* Send the new MIC error report immediately since we are going
* to start countermeasures and AP better do the same.
*/
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
/* initialize countermeasures */
wpa_s->countermeasures = 1;
wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
/*
* Need to wait for completion of request frame. We do not get
* any callback for the message completion, so just wait a
* short while and hope for the best. */
os_sleep(0, 10000);
wpa_drv_set_countermeasures(wpa_s, 1);
wpa_supplicant_deauthenticate(wpa_s,
WLAN_REASON_MICHAEL_MIC_FAILURE);
eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
wpa_s, NULL);
eloop_register_timeout(60, 0,
wpa_supplicant_stop_countermeasures,
wpa_s, NULL);
/* TODO: mark the AP rejected for 60 second. STA is
* allowed to associate with another AP.. */
} else {
#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
if (wpa_s->mic_errors_seen) {
/*
* Reduce the effectiveness of Michael MIC error
* reports as a means for attacking against TKIP if
* more than one MIC failure is noticed with the same
* PTK. We delay the transmission of the reports by a
* random time between 0 and 60 seconds in order to
* force the attacker wait 60 seconds before getting
* the information on whether a frame resulted in a MIC
* failure.
*/
u8 rval[4];
int sec;
if (os_get_random(rval, sizeof(rval)) < 0)
sec = os_random() % 60;
else
sec = WPA_GET_BE32(rval) % 60;
wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d "
"seconds", sec);
wpa_s->pending_mic_error_report = 1;
wpa_s->pending_mic_error_pairwise = pairwise;
eloop_cancel_timeout(
wpa_supplicant_delayed_mic_error_report,
wpa_s, NULL);
eloop_register_timeout(
sec, os_random() % 1000000,
wpa_supplicant_delayed_mic_error_report,
wpa_s, NULL);
} else {
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
}
#else /* CONFIG_DELAYED_MIC_ERROR_REPORT */
wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
}
wpa_s->last_michael_mic_error = t.sec;
wpa_s->mic_errors_seen++;
}
#ifdef CONFIG_TERMINATE_ONLASTIF
static int any_interfaces(struct wpa_supplicant *head)
{
struct wpa_supplicant *wpa_s;
for (wpa_s = head; wpa_s != NULL; wpa_s = wpa_s->next)
if (!wpa_s->interface_removed)
return 1;
return 0;
}
#endif /* CONFIG_TERMINATE_ONLASTIF */
static void
wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
return;
switch (data->interface_status.ievent) {
case EVENT_INTERFACE_ADDED:
if (!wpa_s->interface_removed)
break;
wpa_s->interface_removed = 0;
wpa_printf(MSG_DEBUG, "Configured interface was added.");
if (wpa_supplicant_driver_init(wpa_s) < 0) {
wpa_printf(MSG_INFO, "Failed to initialize the driver "
"after interface was added.");
}
break;
case EVENT_INTERFACE_REMOVED:
wpa_printf(MSG_DEBUG, "Configured interface was removed.");
wpa_s->interface_removed = 1;
wpa_supplicant_mark_disassoc(wpa_s);
l2_packet_deinit(wpa_s->l2);
wpa_s->l2 = NULL;
#ifdef CONFIG_TERMINATE_ONLASTIF
/* check if last interface */
if (!any_interfaces(wpa_s->global->ifaces))
eloop_terminate();
#endif /* CONFIG_TERMINATE_ONLASTIF */
break;
}
}
#ifdef CONFIG_PEERKEY
static void
wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL)
return;
wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
}
#endif /* CONFIG_PEERKEY */
#ifdef CONFIG_IEEE80211R
static void
wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL)
return;
if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
data->ft_ies.ies_len,
data->ft_ies.ft_action,
data->ft_ies.target_ap,
data->ft_ies.ric_ies,
data->ft_ies.ric_ies_len) < 0) {
/* TODO: prevent MLME/driver from trying to associate? */
}
}
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IBSS_RSN
static void wpa_supplicant_event_ibss_rsn_start(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL)
return;
ibss_rsn_start(wpa_s->ibss_rsn, data->ibss_rsn_start.peer);
}
#endif /* CONFIG_IBSS_RSN */
void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
union wpa_event_data *data)
{
struct wpa_supplicant *wpa_s = ctx;
switch (event) {
case EVENT_AUTH:
sme_event_auth(wpa_s, data);
break;
case EVENT_ASSOC:
wpa_supplicant_event_assoc(wpa_s, data);
break;
case EVENT_DISASSOC:
#ifdef CONFIG_AP
if (wpa_s->ap_iface && data) {
hostapd_notif_disassoc(wpa_s->ap_iface->bss[0],
data->disassoc_info.addr);
break;
}
#endif /* CONFIG_AP */
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)
sme_event_disassoc(wpa_s, data);
/* fall through */
case EVENT_DEAUTH:
#ifdef CONFIG_AP
if (wpa_s->ap_iface && data) {
hostapd_notif_disassoc(wpa_s->ap_iface->bss[0],
data->deauth_info.addr);
break;
}
#endif /* CONFIG_AP */
wpa_supplicant_event_disassoc(wpa_s);
break;
case EVENT_MICHAEL_MIC_FAILURE:
wpa_supplicant_event_michael_mic_failure(wpa_s, data);
break;
#ifndef CONFIG_NO_SCAN_PROCESSING
case EVENT_SCAN_RESULTS:
wpa_supplicant_event_scan_results(wpa_s, data);
break;
#endif /* CONFIG_NO_SCAN_PROCESSING */
case EVENT_ASSOCINFO:
wpa_supplicant_event_associnfo(wpa_s, data);
break;
case EVENT_INTERFACE_STATUS:
wpa_supplicant_event_interface_status(wpa_s, data);
break;
case EVENT_PMKID_CANDIDATE:
wpa_supplicant_event_pmkid_candidate(wpa_s, data);
break;
#ifdef CONFIG_PEERKEY
case EVENT_STKSTART:
wpa_supplicant_event_stkstart(wpa_s, data);
break;
#endif /* CONFIG_PEERKEY */
#ifdef CONFIG_IEEE80211R
case EVENT_FT_RESPONSE:
wpa_supplicant_event_ft_response(wpa_s, data);
break;
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IBSS_RSN
case EVENT_IBSS_RSN_START:
wpa_supplicant_event_ibss_rsn_start(wpa_s, data);
break;
#endif /* CONFIG_IBSS_RSN */
case EVENT_ASSOC_REJECT:
sme_event_assoc_reject(wpa_s, data);
break;
case EVENT_AUTH_TIMED_OUT:
sme_event_auth_timed_out(wpa_s, data);
break;
case EVENT_ASSOC_TIMED_OUT:
sme_event_assoc_timed_out(wpa_s, data);
break;
#ifdef CONFIG_AP
case EVENT_TX_STATUS:
if (wpa_s->ap_iface == NULL)
break;
switch (data->tx_status.type) {
case WLAN_FC_TYPE_MGMT:
ap_mgmt_tx_cb(wpa_s, data->tx_status.data,
data->tx_status.data_len,
data->tx_status.stype,
data->tx_status.ack);
break;
case WLAN_FC_TYPE_DATA:
ap_tx_status(wpa_s, data->tx_status.dst,
data->tx_status.data,
data->tx_status.data_len,
data->tx_status.ack);
break;
}
break;
case EVENT_RX_FROM_UNKNOWN:
if (wpa_s->ap_iface == NULL)
break;
ap_rx_from_unknown_sta(wpa_s, data->rx_from_unknown.frame,
data->rx_from_unknown.len);
break;
case EVENT_RX_MGMT:
if (wpa_s->ap_iface == NULL)
break;
ap_mgmt_rx(wpa_s, &data->rx_mgmt);
break;
#endif /* CONFIG_AP */
#ifdef CONFIG_CLIENT_MLME
case EVENT_MLME_RX: {
struct ieee80211_rx_status rx_status;
os_memset(&rx_status, 0, sizeof(rx_status));
rx_status.freq = data->mlme_rx.freq;
rx_status.channel = data->mlme_rx.channel;
rx_status.ssi = data->mlme_rx.ssi;
ieee80211_sta_rx(wpa_s, data->mlme_rx.buf, data->mlme_rx.len,
&rx_status);
break;
}
#endif /* CONFIG_CLIENT_MLME */
case EVENT_EAPOL_RX:
wpa_supplicant_rx_eapol(wpa_s, data->eapol_rx.src,
data->eapol_rx.data,
data->eapol_rx.data_len);
break;
default:
wpa_printf(MSG_INFO, "Unknown event %d", event);
break;
}
}
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