hostap/hostapd/accounting.c

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/*
* hostapd / RADIUS Accounting
* Copyright (c) 2002-2008, 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 "hostapd.h"
#include "radius/radius.h"
#include "radius/radius_client.h"
#include "eloop.h"
#include "accounting.h"
#include "ieee802_1x.h"
#include "driver.h"
/* Default interval in seconds for polling TX/RX octets from the driver if
* STA is not using interim accounting. This detects wrap arounds for
* input/output octets and updates Acct-{Input,Output}-Gigawords. */
#define ACCT_DEFAULT_UPDATE_INTERVAL 300
static void accounting_sta_get_id(struct hostapd_data *hapd,
struct sta_info *sta);
static struct radius_msg * accounting_msg(struct hostapd_data *hapd,
struct sta_info *sta,
int status_type)
{
struct radius_msg *msg;
char buf[128];
u8 *val;
size_t len;
int i;
msg = radius_msg_new(RADIUS_CODE_ACCOUNTING_REQUEST,
radius_client_get_id(hapd->radius));
if (msg == NULL) {
printf("Could not create net RADIUS packet\n");
return NULL;
}
if (sta) {
radius_msg_make_authenticator(msg, (u8 *) sta, sizeof(*sta));
os_snprintf(buf, sizeof(buf), "%08X-%08X",
sta->acct_session_id_hi, sta->acct_session_id_lo);
if (!radius_msg_add_attr(msg, RADIUS_ATTR_ACCT_SESSION_ID,
(u8 *) buf, os_strlen(buf))) {
printf("Could not add Acct-Session-Id\n");
goto fail;
}
} else {
radius_msg_make_authenticator(msg, (u8 *) hapd, sizeof(*hapd));
}
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_STATUS_TYPE,
status_type)) {
printf("Could not add Acct-Status-Type\n");
goto fail;
}
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_AUTHENTIC,
hapd->conf->ieee802_1x ?
RADIUS_ACCT_AUTHENTIC_RADIUS :
RADIUS_ACCT_AUTHENTIC_LOCAL)) {
printf("Could not add Acct-Authentic\n");
goto fail;
}
if (sta) {
val = ieee802_1x_get_identity(sta->eapol_sm, &len);
if (!val) {
os_snprintf(buf, sizeof(buf), RADIUS_ADDR_FORMAT,
MAC2STR(sta->addr));
val = (u8 *) buf;
len = os_strlen(buf);
}
if (!radius_msg_add_attr(msg, RADIUS_ATTR_USER_NAME, val,
len)) {
printf("Could not add User-Name\n");
goto fail;
}
}
if (hapd->conf->own_ip_addr.af == AF_INET &&
!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IP_ADDRESS,
(u8 *) &hapd->conf->own_ip_addr.u.v4, 4)) {
printf("Could not add NAS-IP-Address\n");
goto fail;
}
#ifdef CONFIG_IPV6
if (hapd->conf->own_ip_addr.af == AF_INET6 &&
!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IPV6_ADDRESS,
(u8 *) &hapd->conf->own_ip_addr.u.v6, 16)) {
printf("Could not add NAS-IPv6-Address\n");
goto fail;
}
#endif /* CONFIG_IPV6 */
if (hapd->conf->nas_identifier &&
!radius_msg_add_attr(msg, RADIUS_ATTR_NAS_IDENTIFIER,
(u8 *) hapd->conf->nas_identifier,
os_strlen(hapd->conf->nas_identifier))) {
printf("Could not add NAS-Identifier\n");
goto fail;
}
if (sta &&
!radius_msg_add_attr_int32(msg, RADIUS_ATTR_NAS_PORT, sta->aid)) {
printf("Could not add NAS-Port\n");
goto fail;
}
os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT ":%s",
MAC2STR(hapd->own_addr), hapd->conf->ssid.ssid);
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLED_STATION_ID,
(u8 *) buf, os_strlen(buf))) {
printf("Could not add Called-Station-Id\n");
goto fail;
}
if (sta) {
os_snprintf(buf, sizeof(buf), RADIUS_802_1X_ADDR_FORMAT,
MAC2STR(sta->addr));
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CALLING_STATION_ID,
(u8 *) buf, os_strlen(buf))) {
printf("Could not add Calling-Station-Id\n");
goto fail;
}
if (!radius_msg_add_attr_int32(
msg, RADIUS_ATTR_NAS_PORT_TYPE,
RADIUS_NAS_PORT_TYPE_IEEE_802_11)) {
printf("Could not add NAS-Port-Type\n");
goto fail;
}
os_snprintf(buf, sizeof(buf), "CONNECT %d%sMbps %s",
radius_sta_rate(hapd, sta) / 2,
(radius_sta_rate(hapd, sta) & 1) ? ".5" : "",
radius_mode_txt(hapd));
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CONNECT_INFO,
(u8 *) buf, os_strlen(buf))) {
printf("Could not add Connect-Info\n");
goto fail;
}
for (i = 0; ; i++) {
val = ieee802_1x_get_radius_class(sta->eapol_sm, &len,
i);
if (val == NULL)
break;
if (!radius_msg_add_attr(msg, RADIUS_ATTR_CLASS,
val, len)) {
printf("Could not add Class\n");
goto fail;
}
}
}
return msg;
fail:
radius_msg_free(msg);
os_free(msg);
return NULL;
}
static int accounting_sta_update_stats(struct hostapd_data *hapd,
struct sta_info *sta,
struct hostap_sta_driver_data *data)
{
if (hostapd_read_sta_data(hapd, data, sta->addr))
return -1;
if (sta->last_rx_bytes > data->rx_bytes)
sta->acct_input_gigawords++;
if (sta->last_tx_bytes > data->tx_bytes)
sta->acct_output_gigawords++;
sta->last_rx_bytes = data->rx_bytes;
sta->last_tx_bytes = data->tx_bytes;
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_DEBUG, "updated TX/RX stats: "
"Acct-Input-Octets=%lu Acct-Input-Gigawords=%u "
"Acct-Output-Octets=%lu Acct-Output-Gigawords=%u",
sta->last_rx_bytes, sta->acct_input_gigawords,
sta->last_tx_bytes, sta->acct_output_gigawords);
return 0;
}
static void accounting_interim_update(void *eloop_ctx, void *timeout_ctx)
{
struct hostapd_data *hapd = eloop_ctx;
struct sta_info *sta = timeout_ctx;
int interval;
if (sta->acct_interim_interval) {
accounting_sta_interim(hapd, sta);
interval = sta->acct_interim_interval;
} else {
struct hostap_sta_driver_data data;
accounting_sta_update_stats(hapd, sta, &data);
interval = ACCT_DEFAULT_UPDATE_INTERVAL;
}
eloop_register_timeout(interval, 0, accounting_interim_update,
hapd, sta);
}
void accounting_sta_start(struct hostapd_data *hapd, struct sta_info *sta)
{
struct radius_msg *msg;
int interval;
if (sta->acct_session_started)
return;
accounting_sta_get_id(hapd, sta);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"starting accounting session %08X-%08X",
sta->acct_session_id_hi, sta->acct_session_id_lo);
time(&sta->acct_session_start);
sta->last_rx_bytes = sta->last_tx_bytes = 0;
sta->acct_input_gigawords = sta->acct_output_gigawords = 0;
hostapd_sta_clear_stats(hapd, sta->addr);
if (!hapd->conf->radius->acct_server)
return;
if (sta->acct_interim_interval)
interval = sta->acct_interim_interval;
else
interval = ACCT_DEFAULT_UPDATE_INTERVAL;
eloop_register_timeout(interval, 0, accounting_interim_update,
hapd, sta);
msg = accounting_msg(hapd, sta, RADIUS_ACCT_STATUS_TYPE_START);
if (msg)
radius_client_send(hapd->radius, msg, RADIUS_ACCT, sta->addr);
sta->acct_session_started = 1;
}
static void accounting_sta_report(struct hostapd_data *hapd,
struct sta_info *sta, int stop)
{
struct radius_msg *msg;
int cause = sta->acct_terminate_cause;
struct hostap_sta_driver_data data;
u32 gigawords;
if (!hapd->conf->radius->acct_server)
return;
msg = accounting_msg(hapd, sta,
stop ? RADIUS_ACCT_STATUS_TYPE_STOP :
RADIUS_ACCT_STATUS_TYPE_INTERIM_UPDATE);
if (!msg) {
printf("Could not create RADIUS Accounting message\n");
return;
}
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_SESSION_TIME,
time(NULL) - sta->acct_session_start)) {
printf("Could not add Acct-Session-Time\n");
goto fail;
}
if (accounting_sta_update_stats(hapd, sta, &data) == 0) {
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_INPUT_PACKETS,
data.rx_packets)) {
printf("Could not add Acct-Input-Packets\n");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_OUTPUT_PACKETS,
data.tx_packets)) {
printf("Could not add Acct-Output-Packets\n");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_INPUT_OCTETS,
data.rx_bytes)) {
printf("Could not add Acct-Input-Octets\n");
goto fail;
}
gigawords = sta->acct_input_gigawords;
#if __WORDSIZE == 64
gigawords += data.rx_bytes >> 32;
#endif
if (gigawords &&
!radius_msg_add_attr_int32(
msg, RADIUS_ATTR_ACCT_INPUT_GIGAWORDS,
gigawords)) {
printf("Could not add Acct-Input-Gigawords\n");
goto fail;
}
if (!radius_msg_add_attr_int32(msg,
RADIUS_ATTR_ACCT_OUTPUT_OCTETS,
data.tx_bytes)) {
printf("Could not add Acct-Output-Octets\n");
goto fail;
}
gigawords = sta->acct_output_gigawords;
#if __WORDSIZE == 64
gigawords += data.tx_bytes >> 32;
#endif
if (gigawords &&
!radius_msg_add_attr_int32(
msg, RADIUS_ATTR_ACCT_OUTPUT_GIGAWORDS,
gigawords)) {
printf("Could not add Acct-Output-Gigawords\n");
goto fail;
}
}
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_EVENT_TIMESTAMP,
time(NULL))) {
printf("Could not add Event-Timestamp\n");
goto fail;
}
if (eloop_terminated())
cause = RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_REBOOT;
if (stop && cause &&
!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_TERMINATE_CAUSE,
cause)) {
printf("Could not add Acct-Terminate-Cause\n");
goto fail;
}
radius_client_send(hapd->radius, msg,
stop ? RADIUS_ACCT : RADIUS_ACCT_INTERIM,
sta->addr);
return;
fail:
radius_msg_free(msg);
os_free(msg);
}
void accounting_sta_interim(struct hostapd_data *hapd, struct sta_info *sta)
{
if (sta->acct_session_started)
accounting_sta_report(hapd, sta, 0);
}
void accounting_sta_stop(struct hostapd_data *hapd, struct sta_info *sta)
{
if (sta->acct_session_started) {
accounting_sta_report(hapd, sta, 1);
eloop_cancel_timeout(accounting_interim_update, hapd, sta);
hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
HOSTAPD_LEVEL_INFO,
"stopped accounting session %08X-%08X",
sta->acct_session_id_hi,
sta->acct_session_id_lo);
sta->acct_session_started = 0;
}
}
static void accounting_sta_get_id(struct hostapd_data *hapd,
struct sta_info *sta)
{
sta->acct_session_id_lo = hapd->acct_session_id_lo++;
if (hapd->acct_session_id_lo == 0) {
hapd->acct_session_id_hi++;
}
sta->acct_session_id_hi = hapd->acct_session_id_hi;
}
/* Process the RADIUS frames from Accounting Server */
static RadiusRxResult
accounting_receive(struct radius_msg *msg, struct radius_msg *req,
u8 *shared_secret, size_t shared_secret_len, void *data)
{
if (msg->hdr->code != RADIUS_CODE_ACCOUNTING_RESPONSE) {
printf("Unknown RADIUS message code\n");
return RADIUS_RX_UNKNOWN;
}
if (radius_msg_verify(msg, shared_secret, shared_secret_len, req, 0)) {
printf("Incoming RADIUS packet did not have correct "
"Authenticator - dropped\n");
return RADIUS_RX_INVALID_AUTHENTICATOR;
}
return RADIUS_RX_PROCESSED;
}
static void accounting_report_state(struct hostapd_data *hapd, int on)
{
struct radius_msg *msg;
if (!hapd->conf->radius->acct_server || hapd->radius == NULL)
return;
/* Inform RADIUS server that accounting will start/stop so that the
* server can close old accounting sessions. */
msg = accounting_msg(hapd, NULL,
on ? RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_ON :
RADIUS_ACCT_STATUS_TYPE_ACCOUNTING_OFF);
if (!msg)
return;
if (!radius_msg_add_attr_int32(msg, RADIUS_ATTR_ACCT_TERMINATE_CAUSE,
RADIUS_ACCT_TERMINATE_CAUSE_NAS_REBOOT))
{
printf("Could not add Acct-Terminate-Cause\n");
radius_msg_free(msg);
os_free(msg);
return;
}
radius_client_send(hapd->radius, msg, RADIUS_ACCT, NULL);
}
int accounting_init(struct hostapd_data *hapd)
{
/* Acct-Session-Id should be unique over reboots. If reliable clock is
* not available, this could be replaced with reboot counter, etc. */
hapd->acct_session_id_hi = time(NULL);
if (radius_client_register(hapd->radius, RADIUS_ACCT,
accounting_receive, hapd))
return -1;
accounting_report_state(hapd, 1);
return 0;
}
void accounting_deinit(struct hostapd_data *hapd)
{
accounting_report_state(hapd, 0);
}
int accounting_reconfig(struct hostapd_data *hapd,
struct hostapd_config *oldconf)
{
if (!hapd->radius_client_reconfigured)
return 0;
accounting_deinit(hapd);
return accounting_init(hapd);
}