hostap/hostapd/hw_features.c
Jouni Malinen ba60b94a40 Improved the error message for passive scan not being available
If the driver wrapper does not implement passive_scan handler, do not try
to use strerror() to figure out what the error meant. This is not really an
error that the user should be notified about.
2008-11-18 15:01:24 +02:00

439 lines
11 KiB
C

/*
* hostapd / Hardware feature query and different modes
* Copyright 2002-2003, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
*
* 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 "hw_features.h"
#include "driver.h"
#include "config.h"
#include "eloop.h"
void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
size_t num_hw_features)
{
size_t i;
if (hw_features == NULL)
return;
for (i = 0; i < num_hw_features; i++) {
os_free(hw_features[i].channels);
os_free(hw_features[i].rates);
}
os_free(hw_features);
}
int hostapd_get_hw_features(struct hostapd_iface *iface)
{
struct hostapd_data *hapd = iface->bss[0];
int ret = 0, i, j;
u16 num_modes, flags;
struct hostapd_hw_modes *modes;
if (hostapd_drv_none(hapd))
return -1;
modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
if (modes == NULL) {
hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,
"Fetching hardware channel/rate support not "
"supported.");
return -1;
}
iface->hw_flags = flags;
hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
iface->hw_features = modes;
iface->num_hw_features = num_modes;
for (i = 0; i < num_modes; i++) {
struct hostapd_hw_modes *feature = &modes[i];
/* set flag for channels we can use in current regulatory
* domain */
for (j = 0; j < feature->num_channels; j++) {
/*
* Disable all channels that are marked not to allow
* IBSS operation or active scanning. In addition,
* disable all channels that require radar detection,
* since that (in addition to full DFS) is not yet
* supported.
*/
if (feature->channels[j].flag &
(HOSTAPD_CHAN_NO_IBSS |
HOSTAPD_CHAN_PASSIVE_SCAN |
HOSTAPD_CHAN_RADAR))
feature->channels[j].flag |=
HOSTAPD_CHAN_DISABLED;
if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
continue;
wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
"chan=%d freq=%d MHz",
feature->mode,
feature->channels[j].chan,
feature->channels[j].freq);
}
}
return ret;
}
static int hostapd_prepare_rates(struct hostapd_data *hapd,
struct hostapd_hw_modes *mode)
{
int i, num_basic_rates = 0;
int basic_rates_a[] = { 60, 120, 240, -1 };
int basic_rates_b[] = { 10, 20, -1 };
int basic_rates_g[] = { 10, 20, 55, 110, -1 };
int *basic_rates;
if (hapd->iconf->basic_rates)
basic_rates = hapd->iconf->basic_rates;
else switch (mode->mode) {
case HOSTAPD_MODE_IEEE80211A:
basic_rates = basic_rates_a;
break;
case HOSTAPD_MODE_IEEE80211B:
basic_rates = basic_rates_b;
break;
case HOSTAPD_MODE_IEEE80211G:
basic_rates = basic_rates_g;
break;
default:
return -1;
}
if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
basic_rates, mode->mode)) {
wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
"module");
}
os_free(hapd->iface->current_rates);
hapd->iface->num_rates = 0;
hapd->iface->current_rates =
os_malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
if (!hapd->iface->current_rates) {
wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
"table.");
return -1;
}
for (i = 0; i < mode->num_rates; i++) {
struct hostapd_rate_data *rate;
if (hapd->iconf->supported_rates &&
!hostapd_rate_found(hapd->iconf->supported_rates,
mode->rates[i].rate))
continue;
rate = &hapd->iface->current_rates[hapd->iface->num_rates];
os_memcpy(rate, &mode->rates[i],
sizeof(struct hostapd_rate_data));
if (hostapd_rate_found(basic_rates, rate->rate)) {
rate->flags |= HOSTAPD_RATE_BASIC;
num_basic_rates++;
} else
rate->flags &= ~HOSTAPD_RATE_BASIC;
wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
hapd->iface->num_rates, rate->rate, rate->flags);
hapd->iface->num_rates++;
}
if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
"rate sets (%d,%d).",
hapd->iface->num_rates, num_basic_rates);
return -1;
}
return 0;
}
static void select_hw_mode_start(void *eloop_data, void *user_ctx);
static void select_hw_mode2_handler(void *eloop_data, void *user_ctx);
/**
* select_hw_mode_finalize - Finish select HW mode & call the callback
* @iface: Pointer to interface data.
* @status: Status of the select HW mode (0 on success; -1 on failure).
* Returns: 0 on success; -1 on failure (e.g., was not in progress).
*/
static int select_hw_mode_finalize(struct hostapd_iface *iface, int status)
{
hostapd_iface_cb cb;
if (!iface->hw_mode_sel_cb)
return -1;
eloop_cancel_timeout(select_hw_mode_start, iface, NULL);
eloop_cancel_timeout(select_hw_mode2_handler, iface, NULL);
cb = iface->hw_mode_sel_cb;
iface->hw_mode_sel_cb = NULL;
cb(iface, status);
return 0;
}
/**
* select_hw_mode2 - Select the hardware mode (part 2)
* @iface: Pointer to interface data.
* @status: Status of auto chanel selection.
*
* Setup the rates and passive scanning based on the configuration.
*/
static void select_hw_mode2(struct hostapd_iface *iface, int status)
{
int ret = status;
if (ret)
goto fail;
if (iface->current_mode == NULL) {
hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"Hardware does not support configured channel");
ret = -1;
goto fail;
}
if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"Failed to prepare rates table.");
ret = -1;
goto fail;
}
ret = hostapd_passive_scan(iface->bss[0], 0,
iface->conf->passive_scan_mode,
iface->conf->passive_scan_interval,
iface->conf->passive_scan_listen,
NULL, NULL);
if (ret) {
if (ret == -1) {
wpa_printf(MSG_DEBUG, "Passive scanning not "
"supported");
} else {
wpa_printf(MSG_ERROR, "Could not set passive "
"scanning: %s", strerror(ret));
}
ret = 0;
}
fail:
select_hw_mode_finalize(iface, ret);
}
/**
* select_hw_mode2_handler - Calls select_hw_mode2 when auto chan isn't used
* @eloop_data: Stores the struct hostapd_iface * for the interface.
* @user_ctx: Unused.
*/
static void select_hw_mode2_handler(void *eloop_data, void *user_ctx)
{
struct hostapd_iface *iface = eloop_data;
select_hw_mode2(iface, 0);
}
/**
* select_hw_mode1 - Select the hardware mode (part 1)
* @iface: Pointer to interface data.
* Returns: 0 on success; -1 on failure.
*
* Setup the hardware mode and channel based on the configuration.
* Schedules select_hw_mode2() to be called immediately or after automatic
* channel selection takes place.
*/
static int select_hw_mode1(struct hostapd_iface *iface)
{
int i, j, ok;
if (iface->num_hw_features < 1)
return -1;
iface->current_mode = NULL;
for (i = 0; i < iface->num_hw_features; i++) {
struct hostapd_hw_modes *mode = &iface->hw_features[i];
if (mode->mode == (int) iface->conf->hw_mode) {
iface->current_mode = mode;
break;
}
}
if (iface->current_mode == NULL) {
wpa_printf(MSG_ERROR, "Hardware does not support configured "
"mode");
hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"Hardware does not support configured mode "
"(%d)", (int) iface->conf->hw_mode);
return -1;
}
ok = 0;
for (j = 0; j < iface->current_mode->num_channels; j++) {
struct hostapd_channel_data *chan =
&iface->current_mode->channels[j];
if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
(chan->chan == iface->conf->channel)) {
ok = 1;
break;
}
}
if (ok == 0 && iface->conf->channel != 0) {
hostapd_logger(iface->bss[0], NULL,
HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"Configured channel (%d) not found from the "
"channel list of current mode (%d) %s",
iface->conf->channel,
iface->current_mode->mode,
hostapd_hw_mode_txt(iface->current_mode->mode));
iface->current_mode = NULL;
}
/*
* Calls select_hw_mode2() via a handler, so that the function is
* always executed from eloop.
*/
eloop_register_timeout(0, 0, select_hw_mode2_handler, iface, NULL);
return 0;
}
/**
* select_hw_mode_start - Handler to start select HW mode
* @eloop_data: Stores the struct hostapd_iface * for the interface.
* @user_ctx: Unused.
*
* An eloop handler is used so that all errors can be processed by the
* callback without introducing stack recursion.
*/
static void select_hw_mode_start(void *eloop_data, void *user_ctx)
{
struct hostapd_iface *iface = (struct hostapd_iface *)eloop_data;
int ret;
ret = select_hw_mode1(iface);
if (ret)
select_hw_mode_finalize(iface, ret);
}
/**
* hostapd_select_hw_mode_start - Start selection of the hardware mode
* @iface: Pointer to interface data.
* @cb: The function to callback when done.
* Returns: 0 if it starts successfully; cb will be called when done.
* -1 on failure; cb will not be called.
*
* Sets up the hardware mode, channel, rates, and passive scanning
* based on the configuration.
*/
int hostapd_select_hw_mode_start(struct hostapd_iface *iface,
hostapd_iface_cb cb)
{
if (iface->hw_mode_sel_cb) {
wpa_printf(MSG_DEBUG,
"%s: Hardware mode select already in progress.",
iface->bss[0]->conf->iface);
return -1;
}
iface->hw_mode_sel_cb = cb;
eloop_register_timeout(0, 0, select_hw_mode_start, iface, NULL);
return 0;
}
/**
* hostapd_auto_chan_select_stop - Stops automatic channel selection
* @iface: Pointer to interface data.
* Returns: 0 if successfully stopped;
* -1 on failure (i.e., was not in progress)
*/
int hostapd_select_hw_mode_stop(struct hostapd_iface *iface)
{
return select_hw_mode_finalize(iface, -1);
}
const char * hostapd_hw_mode_txt(int mode)
{
switch (mode) {
case HOSTAPD_MODE_IEEE80211A:
return "IEEE 802.11a";
case HOSTAPD_MODE_IEEE80211B:
return "IEEE 802.11b";
case HOSTAPD_MODE_IEEE80211G:
return "IEEE 802.11g";
default:
return "UNKNOWN";
}
}
int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
{
int i;
if (!hapd->iface->current_mode)
return 0;
for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
struct hostapd_channel_data *ch =
&hapd->iface->current_mode->channels[i];
if (ch->chan == chan)
return ch->freq;
}
return 0;
}
int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
{
int i;
if (!hapd->iface->current_mode)
return 0;
for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
struct hostapd_channel_data *ch =
&hapd->iface->current_mode->channels[i];
if (ch->freq == freq)
return ch->chan;
}
return 0;
}