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433 lines
11 KiB
C
433 lines
11 KiB
C
/*
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* hostapd / Hardware feature query and different modes
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* Copyright 2002-2003, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "hostapd.h"
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#include "hw_features.h"
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#include "driver.h"
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#include "config.h"
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#include "eloop.h"
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void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
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size_t num_hw_features)
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{
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size_t i;
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if (hw_features == NULL)
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return;
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for (i = 0; i < num_hw_features; i++) {
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os_free(hw_features[i].channels);
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os_free(hw_features[i].rates);
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}
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os_free(hw_features);
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}
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int hostapd_get_hw_features(struct hostapd_iface *iface)
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{
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struct hostapd_data *hapd = iface->bss[0];
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int ret = 0, i, j;
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u16 num_modes, flags;
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struct hostapd_hw_modes *modes;
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modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
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if (modes == NULL) {
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hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_DEBUG,
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"Fetching hardware channel/rate support not "
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"supported.");
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return -1;
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}
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iface->hw_flags = flags;
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hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
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iface->hw_features = modes;
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iface->num_hw_features = num_modes;
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for (i = 0; i < num_modes; i++) {
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struct hostapd_hw_modes *feature = &modes[i];
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/* set flag for channels we can use in current regulatory
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* domain */
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for (j = 0; j < feature->num_channels; j++) {
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/* TODO: add regulatory domain lookup */
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unsigned char power_level = 0;
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unsigned char antenna_max = 0;
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if ((feature->mode == HOSTAPD_MODE_IEEE80211G ||
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feature->mode == HOSTAPD_MODE_IEEE80211B) &&
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feature->channels[j].chan >= 1 &&
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feature->channels[j].chan <= 11) {
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power_level = 20;
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feature->channels[j].flag |=
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HOSTAPD_CHAN_W_SCAN;
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} else
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feature->channels[j].flag &=
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~HOSTAPD_CHAN_W_SCAN;
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hostapd_set_channel_flag(hapd, feature->mode,
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feature->channels[j].chan,
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feature->channels[j].flag,
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power_level,
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antenna_max);
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}
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}
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return ret;
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}
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static int hostapd_prepare_rates(struct hostapd_data *hapd,
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struct hostapd_hw_modes *mode)
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{
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int i, num_basic_rates = 0;
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int basic_rates_a[] = { 60, 120, 240, -1 };
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int basic_rates_b[] = { 10, 20, -1 };
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int basic_rates_g[] = { 10, 20, 55, 110, -1 };
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int *basic_rates;
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if (hapd->iconf->basic_rates)
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basic_rates = hapd->iconf->basic_rates;
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else switch (mode->mode) {
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case HOSTAPD_MODE_IEEE80211A:
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basic_rates = basic_rates_a;
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break;
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case HOSTAPD_MODE_IEEE80211B:
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basic_rates = basic_rates_b;
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break;
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case HOSTAPD_MODE_IEEE80211G:
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basic_rates = basic_rates_g;
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break;
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default:
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return -1;
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}
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if (hostapd_set_rate_sets(hapd, hapd->iconf->supported_rates,
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basic_rates, mode->mode)) {
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wpa_printf(MSG_ERROR, "Failed to update rate sets in kernel "
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"module");
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}
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os_free(hapd->iface->current_rates);
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hapd->iface->num_rates = 0;
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hapd->iface->current_rates =
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os_malloc(mode->num_rates * sizeof(struct hostapd_rate_data));
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if (!hapd->iface->current_rates) {
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wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
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"table.");
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return -1;
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}
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for (i = 0; i < mode->num_rates; i++) {
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struct hostapd_rate_data *rate;
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if (hapd->iconf->supported_rates &&
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!hostapd_rate_found(hapd->iconf->supported_rates,
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mode->rates[i].rate))
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continue;
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rate = &hapd->iface->current_rates[hapd->iface->num_rates];
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os_memcpy(rate, &mode->rates[i],
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sizeof(struct hostapd_rate_data));
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if (hostapd_rate_found(basic_rates, rate->rate)) {
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rate->flags |= HOSTAPD_RATE_BASIC;
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num_basic_rates++;
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} else
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rate->flags &= ~HOSTAPD_RATE_BASIC;
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wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
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hapd->iface->num_rates, rate->rate, rate->flags);
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hapd->iface->num_rates++;
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}
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if (hapd->iface->num_rates == 0 || num_basic_rates == 0) {
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wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
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"rate sets (%d,%d).",
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hapd->iface->num_rates, num_basic_rates);
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return -1;
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}
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return 0;
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}
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static void select_hw_mode_start(void *eloop_data, void *user_ctx);
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static void select_hw_mode2_handler(void *eloop_data, void *user_ctx);
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/**
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* select_hw_mode_finalize - Finish select HW mode & call the callback
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* @iface: Pointer to interface data.
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* @status: Status of the select HW mode (0 on success; -1 on failure).
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* Returns: 0 on success; -1 on failure (e.g., was not in progress).
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*/
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static int select_hw_mode_finalize(struct hostapd_iface *iface, int status)
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{
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hostapd_iface_cb cb;
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if (!iface->hw_mode_sel_cb)
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return -1;
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eloop_cancel_timeout(select_hw_mode_start, iface, NULL);
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eloop_cancel_timeout(select_hw_mode2_handler, iface, NULL);
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cb = iface->hw_mode_sel_cb;
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iface->hw_mode_sel_cb = NULL;
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cb(iface, status);
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return 0;
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}
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/**
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* select_hw_mode2 - Select the hardware mode (part 2)
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* @iface: Pointer to interface data.
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* @status: Status of auto chanel selection.
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*
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* Setup the rates and passive scanning based on the configuration.
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*/
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static void select_hw_mode2(struct hostapd_iface *iface, int status)
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{
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int ret = status;
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if (ret)
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goto fail;
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if (iface->current_mode == NULL) {
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hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_WARNING,
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"Hardware does not support configured channel");
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ret = -1;
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goto fail;
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}
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if (hostapd_prepare_rates(iface->bss[0], iface->current_mode)) {
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wpa_printf(MSG_ERROR, "Failed to prepare rates table.");
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hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_WARNING,
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"Failed to prepare rates table.");
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ret = -1;
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goto fail;
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}
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ret = hostapd_passive_scan(iface->bss[0], 0,
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iface->conf->passive_scan_mode,
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iface->conf->passive_scan_interval,
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iface->conf->passive_scan_listen,
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NULL, NULL);
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if (ret) {
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wpa_printf(MSG_ERROR, "Could not set passive scanning: %s",
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strerror(ret));
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ret = 0;
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}
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fail:
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select_hw_mode_finalize(iface, ret);
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}
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/**
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* select_hw_mode2_handler - Calls select_hw_mode2 when auto chan isn't used
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* @eloop_data: Stores the struct hostapd_iface * for the interface.
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* @user_ctx: Unused.
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*/
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static void select_hw_mode2_handler(void *eloop_data, void *user_ctx)
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{
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struct hostapd_iface *iface = eloop_data;
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select_hw_mode2(iface, 0);
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}
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/**
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* select_hw_mode1 - Select the hardware mode (part 1)
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* @iface: Pointer to interface data.
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* Returns: 0 on success; -1 on failure.
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*
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* Setup the hardware mode and channel based on the configuration.
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* Schedules select_hw_mode2() to be called immediately or after automatic
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* channel selection takes place.
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*/
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static int select_hw_mode1(struct hostapd_iface *iface)
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{
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int i, j, ok;
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if (iface->num_hw_features < 1)
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return -1;
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iface->current_mode = NULL;
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for (i = 0; i < iface->num_hw_features; i++) {
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struct hostapd_hw_modes *mode = &iface->hw_features[i];
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if (mode->mode == (int) iface->conf->hw_mode) {
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iface->current_mode = mode;
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break;
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}
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}
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if (iface->current_mode == NULL) {
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wpa_printf(MSG_ERROR, "Hardware does not support configured "
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"mode");
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hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_WARNING,
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"Hardware does not support configured mode "
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"(%d)", (int) iface->conf->hw_mode);
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return -1;
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}
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ok = 0;
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for (j = 0; j < iface->current_mode->num_channels; j++) {
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struct hostapd_channel_data *chan =
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&iface->current_mode->channels[j];
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if ((chan->flag & HOSTAPD_CHAN_W_SCAN) &&
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(chan->chan == iface->conf->channel)) {
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ok = 1;
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break;
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}
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}
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if (ok == 0 && iface->conf->channel != 0) {
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hostapd_logger(iface->bss[0], NULL,
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HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_WARNING,
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"Configured channel (%d) not found from the "
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"channel list of current mode (%d) %s",
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iface->conf->channel,
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iface->current_mode->mode,
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hostapd_hw_mode_txt(iface->current_mode->mode));
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iface->current_mode = NULL;
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}
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/*
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* Calls select_hw_mode2() via a handler, so that the function is
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* always executed from eloop.
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*/
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eloop_register_timeout(0, 0, select_hw_mode2_handler, iface, NULL);
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return 0;
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}
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/**
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* select_hw_mode_start - Handler to start select HW mode
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* @eloop_data: Stores the struct hostapd_iface * for the interface.
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* @user_ctx: Unused.
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*
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* An eloop handler is used so that all errors can be processed by the
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* callback without introducing stack recursion.
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*/
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static void select_hw_mode_start(void *eloop_data, void *user_ctx)
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{
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struct hostapd_iface *iface = (struct hostapd_iface *)eloop_data;
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int ret;
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ret = select_hw_mode1(iface);
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if (ret)
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select_hw_mode_finalize(iface, ret);
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}
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/**
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* hostapd_select_hw_mode_start - Start selection of the hardware mode
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* @iface: Pointer to interface data.
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* @cb: The function to callback when done.
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* Returns: 0 if it starts successfully; cb will be called when done.
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* -1 on failure; cb will not be called.
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*
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* Sets up the hardware mode, channel, rates, and passive scanning
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* based on the configuration.
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*/
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int hostapd_select_hw_mode_start(struct hostapd_iface *iface,
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hostapd_iface_cb cb)
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{
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if (iface->hw_mode_sel_cb) {
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wpa_printf(MSG_DEBUG,
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"%s: Hardware mode select already in progress.",
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iface->bss[0]->conf->iface);
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return -1;
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}
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iface->hw_mode_sel_cb = cb;
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eloop_register_timeout(0, 0, select_hw_mode_start, iface, NULL);
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return 0;
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}
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/**
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* hostapd_auto_chan_select_stop - Stops automatic channel selection
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* @iface: Pointer to interface data.
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* Returns: 0 if successfully stopped;
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* -1 on failure (i.e., was not in progress)
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*/
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int hostapd_select_hw_mode_stop(struct hostapd_iface *iface)
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{
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return select_hw_mode_finalize(iface, -1);
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}
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const char * hostapd_hw_mode_txt(int mode)
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{
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switch (mode) {
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case HOSTAPD_MODE_IEEE80211A:
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return "IEEE 802.11a";
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case HOSTAPD_MODE_IEEE80211B:
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return "IEEE 802.11b";
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case HOSTAPD_MODE_IEEE80211G:
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return "IEEE 802.11g";
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default:
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return "UNKNOWN";
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}
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}
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int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
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{
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int i;
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if (!hapd->iface->current_mode)
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return 0;
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for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
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struct hostapd_channel_data *ch =
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&hapd->iface->current_mode->channels[i];
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if (ch->chan == chan)
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return ch->freq;
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}
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return 0;
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}
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int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
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{
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int i;
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if (!hapd->iface->current_mode)
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return 0;
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for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
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struct hostapd_channel_data *ch =
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&hapd->iface->current_mode->channels[i];
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if (ch->freq == freq)
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return ch->chan;
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}
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return 0;
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}
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