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hostap/src/ap/drv_callbacks.c

388 lines
9.4 KiB
C

/*
* hostapd / Callback functions for driver wrappers
* Copyright (c) 2002-2009, 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"
#include "utils/common.h"
#include "radius/radius.h"
#include "hostapd.h"
#include "ieee802_11.h"
#include "sta_info.h"
#include "accounting.h"
#include "tkip_countermeasures.h"
#include "iapp.h"
#include "ieee802_1x.h"
#include "wpa_auth.h"
#include "wmm.h"
#include "wps_hostapd.h"
#include "driver_i.h"
int hostapd_notif_new_sta(struct hostapd_data *hapd, const u8 *addr)
{
struct sta_info *sta = ap_get_sta(hapd, addr);
if (sta)
return 0;
wpa_printf(MSG_DEBUG, "Data frame from unknown STA " MACSTR
" - adding a new STA", MAC2STR(addr));
sta = ap_sta_add(hapd, addr);
if (sta) {
hostapd_new_assoc_sta(hapd, sta, 0);
} else {
wpa_printf(MSG_DEBUG, "Failed to add STA entry for " MACSTR,
MAC2STR(addr));
return -1;
}
return 0;
}
int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr,
const u8 *ie, size_t ielen)
{
struct sta_info *sta;
int new_assoc, res;
hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "associated");
sta = ap_get_sta(hapd, addr);
if (sta) {
accounting_sta_stop(hapd, sta);
} else {
sta = ap_sta_add(hapd, addr);
if (sta == NULL)
return -1;
}
sta->flags &= ~(WLAN_STA_WPS | WLAN_STA_MAYBE_WPS);
if (hapd->conf->wpa) {
if (ie == NULL || ielen == 0) {
if (hapd->conf->wps_state) {
wpa_printf(MSG_DEBUG, "STA did not include "
"WPA/RSN IE in (Re)Association "
"Request - possible WPS use");
sta->flags |= WLAN_STA_MAYBE_WPS;
goto skip_wpa_check;
}
wpa_printf(MSG_DEBUG, "No WPA/RSN IE from STA");
return -1;
}
if (hapd->conf->wps_state && ie[0] == 0xdd && ie[1] >= 4 &&
os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) {
sta->flags |= WLAN_STA_WPS;
goto skip_wpa_check;
}
if (sta->wpa_sm == NULL)
sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth,
sta->addr);
if (sta->wpa_sm == NULL) {
wpa_printf(MSG_ERROR, "Failed to initialize WPA state "
"machine");
return -1;
}
res = wpa_validate_wpa_ie(hapd->wpa_auth, sta->wpa_sm,
ie, ielen, NULL, 0);
if (res != WPA_IE_OK) {
int resp;
wpa_printf(MSG_DEBUG, "WPA/RSN information element "
"rejected? (res %u)", res);
wpa_hexdump(MSG_DEBUG, "IE", ie, ielen);
if (res == WPA_INVALID_GROUP)
resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID;
else if (res == WPA_INVALID_PAIRWISE)
resp = WLAN_REASON_PAIRWISE_CIPHER_NOT_VALID;
else if (res == WPA_INVALID_AKMP)
resp = WLAN_REASON_AKMP_NOT_VALID;
#ifdef CONFIG_IEEE80211W
else if (res == WPA_MGMT_FRAME_PROTECTION_VIOLATION)
resp = WLAN_REASON_INVALID_IE;
else if (res == WPA_INVALID_MGMT_GROUP_CIPHER)
resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID;
#endif /* CONFIG_IEEE80211W */
else
resp = WLAN_REASON_INVALID_IE;
hapd->drv.sta_disassoc(hapd, sta->addr, resp);
ap_free_sta(hapd, sta);
return -1;
}
} else if (hapd->conf->wps_state) {
if (ie && ielen > 4 && ie[0] == 0xdd && ie[1] >= 4 &&
os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) {
sta->flags |= WLAN_STA_WPS;
} else
sta->flags |= WLAN_STA_MAYBE_WPS;
}
skip_wpa_check:
new_assoc = (sta->flags & WLAN_STA_ASSOC) == 0;
sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC;
wpa_auth_sm_event(sta->wpa_sm, WPA_ASSOC);
hostapd_new_assoc_sta(hapd, sta, !new_assoc);
ieee802_1x_notify_port_enabled(sta->eapol_sm, 1);
return 0;
}
void hostapd_notif_disassoc(struct hostapd_data *hapd, const u8 *addr)
{
struct sta_info *sta;
hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_INFO, "disassociated");
sta = ap_get_sta(hapd, addr);
if (sta == NULL) {
wpa_printf(MSG_DEBUG, "Disassociation notification for "
"unknown STA " MACSTR, MAC2STR(addr));
return;
}
sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
wpa_auth_sm_event(sta->wpa_sm, WPA_DISASSOC);
sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
ieee802_1x_notify_port_enabled(sta->eapol_sm, 0);
ap_free_sta(hapd, sta);
}
void hostapd_eapol_receive(struct hostapd_data *hapd, const u8 *sa,
const u8 *buf, size_t len)
{
ieee802_1x_receive(hapd, sa, buf, len);
}
struct hostapd_data * hostapd_sta_get_bss(struct hostapd_data *hapd,
const u8 *addr)
{
struct hostapd_iface *iface = hapd->iface;
size_t j;
for (j = 0; j < iface->num_bss; j++) {
hapd = iface->bss[j];
if (ap_get_sta(hapd, addr))
return hapd;
}
return NULL;
}
#ifdef HOSTAPD
#ifdef NEED_AP_MLME
static const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len)
{
u16 fc, type, stype;
/*
* PS-Poll frames are 16 bytes. All other frames are
* 24 bytes or longer.
*/
if (len < 16)
return NULL;
fc = le_to_host16(hdr->frame_control);
type = WLAN_FC_GET_TYPE(fc);
stype = WLAN_FC_GET_STYPE(fc);
switch (type) {
case WLAN_FC_TYPE_DATA:
if (len < 24)
return NULL;
switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) {
case WLAN_FC_FROMDS | WLAN_FC_TODS:
case WLAN_FC_TODS:
return hdr->addr1;
case WLAN_FC_FROMDS:
return hdr->addr2;
default:
return NULL;
}
case WLAN_FC_TYPE_CTRL:
if (stype != WLAN_FC_STYPE_PSPOLL)
return NULL;
return hdr->addr1;
case WLAN_FC_TYPE_MGMT:
return hdr->addr3;
default:
return NULL;
}
}
#define HAPD_BROADCAST ((struct hostapd_data *) -1)
static struct hostapd_data * get_hapd_bssid(struct hostapd_iface *iface,
const u8 *bssid)
{
size_t i;
if (bssid == NULL)
return NULL;
if (bssid[0] == 0xff && bssid[1] == 0xff && bssid[2] == 0xff &&
bssid[3] == 0xff && bssid[4] == 0xff && bssid[5] == 0xff)
return HAPD_BROADCAST;
for (i = 0; i < iface->num_bss; i++) {
if (os_memcmp(bssid, iface->bss[i]->own_addr, ETH_ALEN) == 0)
return iface->bss[i];
}
return NULL;
}
static void hostapd_rx_from_unknown_sta(struct hostapd_data *hapd,
const struct ieee80211_hdr *hdr,
size_t len)
{
u16 fc = le_to_host16(hdr->frame_control);
hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len));
if (hapd == NULL || hapd == HAPD_BROADCAST)
return;
ieee802_11_rx_from_unknown(hapd, hdr->addr2,
(fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
(WLAN_FC_TODS | WLAN_FC_FROMDS));
}
static void hostapd_mgmt_rx(struct hostapd_data *hapd, const u8 *buf,
size_t len, struct hostapd_frame_info *fi)
{
struct hostapd_iface *iface = hapd->iface;
const struct ieee80211_hdr *hdr;
const u8 *bssid;
hdr = (const struct ieee80211_hdr *) buf;
bssid = get_hdr_bssid(hdr, len);
if (bssid == NULL)
return;
hapd = get_hapd_bssid(iface, bssid);
if (hapd == NULL) {
u16 fc;
fc = le_to_host16(hdr->frame_control);
/*
* Drop frames to unknown BSSIDs except for Beacon frames which
* could be used to update neighbor information.
*/
if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON)
hapd = iface->bss[0];
else
return;
}
if (hapd == HAPD_BROADCAST) {
size_t i;
for (i = 0; i < iface->num_bss; i++)
ieee802_11_mgmt(iface->bss[i], buf, len, fi);
} else
ieee802_11_mgmt(hapd, buf, len, fi);
}
static void hostapd_mgmt_tx_cb(struct hostapd_data *hapd, const u8 *buf,
size_t len, u16 stype, int ok)
{
struct ieee80211_hdr *hdr;
hdr = (struct ieee80211_hdr *) buf;
hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len));
if (hapd == NULL || hapd == HAPD_BROADCAST)
return;
ieee802_11_mgmt_cb(hapd, buf, len, stype, ok);
}
#endif /* NEED_AP_MLME */
void wpa_supplicant_event(void *ctx, wpa_event_type event,
union wpa_event_data *data)
{
struct hostapd_data *hapd = ctx;
switch (event) {
case EVENT_MICHAEL_MIC_FAILURE:
michael_mic_failure(hapd, data->michael_mic_failure.src, 1);
break;
case EVENT_SCAN_RESULTS:
if (hapd->iface->scan_cb)
hapd->iface->scan_cb(hapd->iface);
break;
#ifdef CONFIG_IEEE80211R
case EVENT_FT_RRB_RX:
wpa_ft_rrb_rx(hapd->wpa_auth, data->ft_rrb_rx.src,
data->ft_rrb_rx.data, data->ft_rrb_rx.data_len);
break;
#endif /* CONFIG_IEEE80211R */
case EVENT_WPS_BUTTON_PUSHED:
hostapd_wps_button_pushed(hapd);
break;
#ifdef NEED_AP_MLME
case EVENT_TX_STATUS:
switch (data->tx_status.type) {
case WLAN_FC_TYPE_MGMT:
hostapd_mgmt_tx_cb(hapd, data->tx_status.data,
data->tx_status.data_len,
data->tx_status.stype,
data->tx_status.ack);
break;
case WLAN_FC_TYPE_DATA:
hostapd_tx_status(hapd, data->tx_status.dst,
data->tx_status.data,
data->tx_status.data_len,
data->tx_status.ack);
break;
}
break;
case EVENT_RX_FROM_UNKNOWN:
hostapd_rx_from_unknown_sta(hapd, data->rx_from_unknown.hdr,
data->rx_from_unknown.len);
break;
case EVENT_RX_MGMT:
hostapd_mgmt_rx(hapd, data->rx_mgmt.frame,
data->rx_mgmt.frame_len, data->rx_mgmt.fi);
break;
#endif /* NEED_AP_MLME */
default:
wpa_printf(MSG_DEBUG, "Unknown event %d", event);
break;
}
}
#endif /* HOSTAPD */
void hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa,
const u8 *ie, size_t ie_len)
{
size_t i;
for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
sa, ie, ie_len);
}