487 lines
12 KiB
C
487 lines
12 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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* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
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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_i.h"
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#include "config.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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if (hostapd_drv_none(hapd))
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return -1;
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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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/*
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* Disable all channels that are marked not to allow
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* IBSS operation or active scanning. In addition,
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* disable all channels that require radar detection,
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* since that (in addition to full DFS) is not yet
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* supported.
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*/
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if (feature->channels[j].flag &
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(HOSTAPD_CHAN_NO_IBSS |
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HOSTAPD_CHAN_PASSIVE_SCAN |
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HOSTAPD_CHAN_RADAR))
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feature->channels[j].flag |=
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HOSTAPD_CHAN_DISABLED;
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if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
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continue;
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wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
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"chan=%d freq=%d MHz max_tx_power=%d dBm",
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feature->mode,
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feature->channels[j].chan,
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feature->channels[j].freq,
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feature->channels[j].max_tx_power);
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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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#ifdef CONFIG_IEEE80211N
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static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
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{
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int sec_chan, ok, j, first;
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int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
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184, 192 };
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size_t k;
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if (!iface->conf->secondary_channel)
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return 1; /* HT40 not used */
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sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
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wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
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"secondary channel: %d",
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iface->conf->channel, sec_chan);
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/* Verify that HT40 secondary channel is an allowed 20 MHz
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* channel */
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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_DISABLED) &&
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chan->chan == sec_chan) {
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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) {
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wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
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sec_chan);
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return 0;
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}
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/*
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* Verify that HT40 primary,secondary channel pair is allowed per
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* IEEE 802.11n Annex J. This is only needed for 5 GHz band since
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* 2.4 GHz rules allow all cases where the secondary channel fits into
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* the list of allowed channels (already checked above).
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*/
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if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
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return 1;
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if (iface->conf->secondary_channel > 0)
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first = iface->conf->channel;
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else
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first = sec_chan;
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ok = 0;
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for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) {
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if (first == allowed[k]) {
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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) {
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wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
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iface->conf->channel,
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iface->conf->secondary_channel);
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return 0;
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}
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return 1;
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}
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static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
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{
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u16 hw = iface->current_mode->ht_capab;
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u16 conf = iface->conf->ht_capab;
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if (!iface->conf->ieee80211n)
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return 1;
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if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
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!(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [LDPC]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
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!(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [HT40*]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
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(conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [SMPS-*]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
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!(hw & HT_CAP_INFO_GREEN_FIELD)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [GF]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
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!(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [SHORT-GI-20]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
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!(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [SHORT-GI-40]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [TX-STBC]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
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(hw & HT_CAP_INFO_RX_STBC_MASK)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [RX-STBC*]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_DELAYED_BA) &&
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!(hw & HT_CAP_INFO_DELAYED_BA)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [DELAYED-BA]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
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!(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [MAX-AMSDU-7935]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
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!(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [DSSS_CCK-40]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [PSMP]");
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return 0;
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}
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if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
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!(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
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wpa_printf(MSG_ERROR, "Driver does not support configured "
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"HT capability [LSIG-TXOP-PROT]");
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return 0;
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}
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return 1;
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}
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#endif /* CONFIG_IEEE80211N */
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/**
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* hostapd_select_hw_mode - Select the hardware mode
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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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* 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(struct hostapd_iface *iface)
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{
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int i, j, ok, ret;
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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_DISABLED) &&
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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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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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return -1;
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}
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#ifdef CONFIG_IEEE80211N
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if (!ieee80211n_allowed_ht40_channel_pair(iface))
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return -1;
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if (!ieee80211n_supported_ht_capab(iface))
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return -1;
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#endif /* CONFIG_IEEE80211N */
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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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return -1;
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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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if (ret == -1) {
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wpa_printf(MSG_DEBUG, "Passive scanning not "
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"supported");
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} else {
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wpa_printf(MSG_ERROR, "Could not set passive "
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"scanning: %s", strerror(ret));
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}
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ret = 0;
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}
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return ret;
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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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