/*
* hostapd / Hardware feature query and different modes
* Copyright 2002-2003, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "common/wpa_ctrl.h"
#include "hostapd.h"
#include "ap_config.h"
#include "ap_drv_ops.h"
#include "acs.h"
#include "ieee802_11.h"
#include "beacon.h"
#include "hw_features.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);
}
#ifndef CONFIG_NO_STDOUT_DEBUG
static char * dfs_info(struct hostapd_channel_data *chan)
{
static char info[256];
char *state;
switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
case HOSTAPD_CHAN_DFS_UNKNOWN:
state = "unknown";
break;
case HOSTAPD_CHAN_DFS_USABLE:
state = "usable";
break;
case HOSTAPD_CHAN_DFS_UNAVAILABLE:
state = "unavailable";
break;
case HOSTAPD_CHAN_DFS_AVAILABLE:
state = "available";
break;
default:
return "";
}
os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
info[sizeof(info) - 1] = '\0';
return info;
}
#endif /* CONFIG_NO_STDOUT_DEBUG */
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];
int dfs_enabled = hapd->iconf->ieee80211h &&
(iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
/* set flag for channels we can use in current regulatory
* domain */
for (j = 0; j < feature->num_channels; j++) {
int dfs = 0;
/*
* Disable all channels that are marked not to allow
* IBSS operation or active scanning.
* Use radar channels only if the driver supports DFS.
*/
if ((feature->channels[j].flag &
HOSTAPD_CHAN_RADAR) && dfs_enabled) {
dfs = 1;
} else if (((feature->channels[j].flag &
HOSTAPD_CHAN_RADAR) &&
!(iface->drv_flags &
WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
(feature->channels[j].flag &
(HOSTAPD_CHAN_NO_IBSS |
HOSTAPD_CHAN_PASSIVE_SCAN))) {
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 max_tx_power=%d dBm%s",
feature->mode,
feature->channels[j].chan,
feature->channels[j].freq,
feature->channels[j].max_tx_power,
dfs ? dfs_info(&feature->channels[j]) : "");
}
}
return ret;
}
int hostapd_prepare_rates(struct hostapd_iface *iface,
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 (iface->conf->basic_rates)
basic_rates = iface->conf->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;
case HOSTAPD_MODE_IEEE80211AD:
return 0; /* No basic rates for 11ad */
default:
return -1;
}
i = 0;
while (basic_rates[i] >= 0)
i++;
if (i)
i++; /* -1 termination */
os_free(iface->basic_rates);
iface->basic_rates = os_malloc(i * sizeof(int));
if (iface->basic_rates)
os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
os_free(iface->current_rates);
iface->num_rates = 0;
iface->current_rates =
os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
if (!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 (iface->conf->supported_rates &&
!hostapd_rate_found(iface->conf->supported_rates,
mode->rates[i]))
continue;
rate = &iface->current_rates[iface->num_rates];
rate->rate = mode->rates[i];
if (hostapd_rate_found(basic_rates, rate->rate)) {
rate->flags |= HOSTAPD_RATE_BASIC;
num_basic_rates++;
}
wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
iface->num_rates, rate->rate, rate->flags);
iface->num_rates++;
}
if ((iface->num_rates == 0 || num_basic_rates == 0) &&
(!iface->conf->ieee80211n || !iface->conf->require_ht)) {
wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
"rate sets (%d,%d).",
iface->num_rates, num_basic_rates);
return -1;
}
return 0;
}
#ifdef CONFIG_IEEE80211N
static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
{
int sec_chan, ok, j, first;
int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
184, 192 };
size_t k;
if (!iface->conf->secondary_channel)
return 1; /* HT40 not used */
sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
"secondary channel: %d",
iface->conf->channel, sec_chan);
/* Verify that HT40 secondary channel is an allowed 20 MHz
* channel */
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 == sec_chan) {
ok = 1;
break;
}
}
if (!ok) {
wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
sec_chan);
return 0;
}
/*
* Verify that HT40 primary,secondary channel pair is allowed per
* IEEE 802.11n Annex J. This is only needed for 5 GHz band since
* 2.4 GHz rules allow all cases where the secondary channel fits into
* the list of allowed channels (already checked above).
*/
if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
return 1;
if (iface->conf->secondary_channel > 0)
first = iface->conf->channel;
else
first = sec_chan;
ok = 0;
for (k = 0; k < ARRAY_SIZE(allowed); k++) {
if (first == allowed[k]) {
ok = 1;
break;
}
}
if (!ok) {
wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
iface->conf->channel,
iface->conf->secondary_channel);
return 0;
}
return 1;
}
static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
{
if (iface->conf->secondary_channel > 0) {
iface->conf->channel += 4;
iface->conf->secondary_channel = -1;
} else {
iface->conf->channel -= 4;
iface->conf->secondary_channel = 1;
}
}
static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
int *pri_chan, int *sec_chan)
{
struct ieee80211_ht_operation *oper;
struct ieee802_11_elems elems;
*pri_chan = *sec_chan = 0;
ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
if (elems.ht_operation &&
elems.ht_operation_len >= sizeof(*oper)) {
oper = (struct ieee80211_ht_operation *) elems.ht_operation;
*pri_chan = oper->primary_chan;
if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
int sec = oper->ht_param &
HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
*sec_chan = *pri_chan + 4;
else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
*sec_chan = *pri_chan - 4;
}
}
}
static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
struct wpa_scan_results *scan_res)
{
int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
int bss_pri_chan, bss_sec_chan;
size_t i;
int match;
pri_chan = iface->conf->channel;
sec_chan = pri_chan + iface->conf->secondary_channel * 4;
pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
if (iface->conf->secondary_channel > 0)
sec_freq = pri_freq + 20;
else
sec_freq = pri_freq - 20;
/*
* Switch PRI/SEC channels if Beacons were detected on selected SEC
* channel, but not on selected PRI channel.
*/
pri_bss = sec_bss = 0;
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
if (bss->freq == pri_freq)
pri_bss++;
else if (bss->freq == sec_freq)
sec_bss++;
}
if (sec_bss && !pri_bss) {
wpa_printf(MSG_INFO, "Switch own primary and secondary "
"channel to get secondary channel with no Beacons "
"from other BSSes");
ieee80211n_switch_pri_sec(iface);
return 1;
}
/*
* Match PRI/SEC channel with any existing HT40 BSS on the same
* channels that we are about to use (if already mixed order in
* existing BSSes, use own preference).
*/
match = 0;
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
if (pri_chan == bss_pri_chan &&
sec_chan == bss_sec_chan) {
match = 1;
break;
}
}
if (!match) {
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
&bss_sec_chan);
if (pri_chan == bss_sec_chan &&
sec_chan == bss_pri_chan) {
wpa_printf(MSG_INFO, "Switch own primary and "
"secondary channel due to BSS "
"overlap with " MACSTR,
MAC2STR(bss->bssid));
ieee80211n_switch_pri_sec(iface);
break;
}
}
}
return 1;
}
static int ieee80211n_check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq,
int start, int end)
{
struct ieee802_11_elems elems;
struct ieee80211_ht_operation *oper;
if (bss->freq < start || bss->freq > end || bss->freq == pri_freq)
return 0;
ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
if (!elems.ht_capabilities) {
wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
return 1;
}
if (elems.ht_operation &&
elems.ht_operation_len >= sizeof(*oper)) {
oper = (struct ieee80211_ht_operation *) elems.ht_operation;
if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
return 0;
wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
return 1;
}
return 0;
}
static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
struct wpa_scan_results *scan_res)
{
int pri_freq, sec_freq;
int affected_start, affected_end;
size_t i;
pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
if (iface->conf->secondary_channel > 0)
sec_freq = pri_freq + 20;
else
sec_freq = pri_freq - 20;
affected_start = (pri_freq + sec_freq) / 2 - 25;
affected_end = (pri_freq + sec_freq) / 2 + 25;
wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
affected_start, affected_end);
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
int pri = bss->freq;
int sec = pri;
int sec_chan, pri_chan;
struct ieee802_11_elems elems;
/* Check for overlapping 20 MHz BSS */
if (ieee80211n_check_20mhz_bss(bss, pri_freq, affected_start,
affected_end)) {
wpa_printf(MSG_DEBUG,
"Overlapping 20 MHz BSS is found");
return 0;
}
ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
if (sec_chan) {
if (sec_chan < pri_chan)
sec = pri - 20;
else
sec = pri + 20;
}
if ((pri < affected_start || pri > affected_end) &&
(sec < affected_start || sec > affected_end))
continue; /* not within affected channel range */
wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
" freq=%d pri=%d sec=%d",
MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
if (sec_chan) {
if (pri_freq != pri || sec_freq != sec) {
wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
"mismatch with BSS " MACSTR
" <%d,%d> (chan=%d%c) vs. <%d,%d>",
MAC2STR(bss->bssid),
pri, sec, pri_chan,
sec > pri ? '+' : '-',
pri_freq, sec_freq);
return 0;
}
}
ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
0);
if (elems.ht_capabilities &&
elems.ht_capabilities_len >=
sizeof(struct ieee80211_ht_capabilities)) {
struct ieee80211_ht_capabilities *ht_cap =
(struct ieee80211_ht_capabilities *)
elems.ht_capabilities;
if (le_to_host16(ht_cap->ht_capabilities_info) &
HT_CAP_INFO_40MHZ_INTOLERANT) {
wpa_printf(MSG_DEBUG,
"40 MHz Intolerant is set on channel %d in BSS "
MACSTR, pri, MAC2STR(bss->bssid));
return 0;
}
}
}
return 1;
}
static void ieee80211n_check_scan(struct hostapd_iface *iface)
{
struct wpa_scan_results *scan_res;
int oper40;
int res;
/* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
* allowed per IEEE Std 802.11-2012, 10.15.3.2 */
iface->scan_cb = NULL;
scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
if (scan_res == NULL) {
hostapd_setup_interface_complete(iface, 1);
return;
}
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
else
oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
wpa_scan_results_free(scan_res);
iface->secondary_ch = iface->conf->secondary_channel;
if (!oper40) {
wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
"channel pri=%d sec=%d based on overlapping BSSes",
iface->conf->channel,
iface->conf->channel +
iface->conf->secondary_channel * 4);
iface->conf->secondary_channel = 0;
if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
/*
* TODO: Could consider scheduling another scan to check
* if channel width can be changed if no coex reports
* are received from associating stations.
*/
}
}
res = ieee80211n_allowed_ht40_channel_pair(iface);
if (!res) {
iface->conf->secondary_channel = 0;
wpa_printf(MSG_INFO, "Fallback to 20 MHz");
}
hostapd_setup_interface_complete(iface, !res);
}
static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
struct wpa_driver_scan_params *params)
{
/* Scan only the affected frequency range */
int pri_freq, sec_freq;
int affected_start, affected_end;
int i, pos;
struct hostapd_hw_modes *mode;
if (iface->current_mode == NULL)
return;
pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
if (iface->conf->secondary_channel > 0)
sec_freq = pri_freq + 20;
else
sec_freq = pri_freq - 20;
affected_start = (pri_freq + sec_freq) / 2 - 25;
affected_end = (pri_freq + sec_freq) / 2 + 25;
wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
affected_start, affected_end);
mode = iface->current_mode;
params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
if (params->freqs == NULL)
return;
pos = 0;
for (i = 0; i < mode->num_channels; i++) {
struct hostapd_channel_data *chan = &mode->channels[i];
if (chan->flag & HOSTAPD_CHAN_DISABLED)
continue;
if (chan->freq < affected_start ||
chan->freq > affected_end)
continue;
params->freqs[pos++] = chan->freq;
}
}
static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
struct wpa_driver_scan_params *params)
{
/* Scan only the affected frequency range */
int pri_freq;
int affected_start, affected_end;
int i, pos;
struct hostapd_hw_modes *mode;
if (iface->current_mode == NULL)
return;
pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
if (iface->conf->secondary_channel > 0) {
affected_start = pri_freq - 10;
affected_end = pri_freq + 30;
} else {
affected_start = pri_freq - 30;
affected_end = pri_freq + 10;
}
wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
affected_start, affected_end);
mode = iface->current_mode;
params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
if (params->freqs == NULL)
return;
pos = 0;
for (i = 0; i < mode->num_channels; i++) {
struct hostapd_channel_data *chan = &mode->channels[i];
if (chan->flag & HOSTAPD_CHAN_DISABLED)
continue;
if (chan->freq < affected_start ||
chan->freq > affected_end)
continue;
params->freqs[pos++] = chan->freq;
}
}
static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
{
#define HT2040_COEX_SCAN_RETRY 15
struct hostapd_iface *iface = eloop_data;
struct wpa_driver_scan_params params;
int ret;
os_memset(¶ms, 0, sizeof(params));
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
ieee80211n_scan_channels_2g4(iface, ¶ms);
else
ieee80211n_scan_channels_5g(iface, ¶ms);
ret = hostapd_driver_scan(iface->bss[0], ¶ms);
iface->num_ht40_scan_tries++;
os_free(params.freqs);
if (ret == -EBUSY &&
iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
ret, strerror(-ret), iface->num_ht40_scan_tries);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
return;
}
if (ret == 0) {
iface->scan_cb = ieee80211n_check_scan;
return;
}
wpa_printf(MSG_DEBUG,
"Failed to request a scan in device, bringing up in HT20 mode");
iface->conf->secondary_channel = 0;
iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
hostapd_setup_interface_complete(iface, 0);
}
void hostapd_stop_setup_timers(struct hostapd_iface *iface)
{
eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
}
static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
{
struct wpa_driver_scan_params params;
int ret;
if (!iface->conf->secondary_channel)
return 0; /* HT40 not used */
hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
"40 MHz channel");
os_memset(¶ms, 0, sizeof(params));
if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
ieee80211n_scan_channels_2g4(iface, ¶ms);
else
ieee80211n_scan_channels_5g(iface, ¶ms);
ret = hostapd_driver_scan(iface->bss[0], ¶ms);
os_free(params.freqs);
if (ret == -EBUSY) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
ret, strerror(-ret));
iface->num_ht40_scan_tries = 1;
eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
return 1;
}
if (ret < 0) {
wpa_printf(MSG_ERROR,
"Failed to request a scan of neighboring BSSes ret=%d (%s)",
ret, strerror(-ret));
return -1;
}
iface->scan_cb = ieee80211n_check_scan;
return 1;
}
static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
{
u16 hw = iface->current_mode->ht_capab;
u16 conf = iface->conf->ht_capab;
if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
!(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [LDPC]");
return 0;
}
if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
!(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [HT40*]");
return 0;
}
if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
(conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [SMPS-*]");
return 0;
}
if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
!(hw & HT_CAP_INFO_GREEN_FIELD)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [GF]");
return 0;
}
if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
!(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [SHORT-GI-20]");
return 0;
}
if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
!(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [SHORT-GI-40]");
return 0;
}
if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [TX-STBC]");
return 0;
}
if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
(hw & HT_CAP_INFO_RX_STBC_MASK)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [RX-STBC*]");
return 0;
}
if ((conf & HT_CAP_INFO_DELAYED_BA) &&
!(hw & HT_CAP_INFO_DELAYED_BA)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [DELAYED-BA]");
return 0;
}
if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
!(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [MAX-AMSDU-7935]");
return 0;
}
if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
!(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [DSSS_CCK-40]");
return 0;
}
if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
!(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
wpa_printf(MSG_ERROR, "Driver does not support configured "
"HT capability [LSIG-TXOP-PROT]");
return 0;
}
return 1;
}
#ifdef CONFIG_IEEE80211AC
static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name)
{
u32 req_cap = conf & cap;
/*
* Make sure we support all requested capabilities.
* NOTE: We assume that 'cap' represents a capability mask,
* not a discrete value.
*/
if ((hw & req_cap) != req_cap) {
wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]",
name);
return 0;
}
return 1;
}
static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 cap,
const char *name)
{
u32 hw_max = hw & cap;
u32 conf_val = conf & cap;
if (conf_val > hw_max) {
int offset = find_first_bit(cap);
wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
name, conf_val >> offset, hw_max >> offset);
return 0;
}
return 1;
}
static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
{
u32 hw = iface->current_mode->vht_capab;
u32 conf = iface->conf->vht_capab;
wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
hw, conf);
#define VHT_CAP_CHECK(cap) \
do { \
if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \
return 0; \
} while (0)
#define VHT_CAP_CHECK_MAX(cap) \
do { \
if (!ieee80211ac_cap_check_max(hw, conf, cap, #cap)) \
return 0; \
} while (0)
VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
VHT_CAP_CHECK(VHT_CAP_RXLDPC);
VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
VHT_CAP_CHECK(VHT_CAP_TXSTBC);
VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
#undef VHT_CAP_CHECK
#undef VHT_CAP_CHECK_MAX
return 1;
}
#endif /* CONFIG_IEEE80211AC */
#endif /* CONFIG_IEEE80211N */
int hostapd_check_ht_capab(struct hostapd_iface *iface)
{
#ifdef CONFIG_IEEE80211N
int ret;
if (!iface->conf->ieee80211n)
return 0;
if (!ieee80211n_supported_ht_capab(iface))
return -1;
#ifdef CONFIG_IEEE80211AC
if (!ieee80211ac_supported_vht_capab(iface))
return -1;
#endif /* CONFIG_IEEE80211AC */
ret = ieee80211n_check_40mhz(iface);
if (ret)
return ret;
if (!ieee80211n_allowed_ht40_channel_pair(iface))
return -1;
#endif /* CONFIG_IEEE80211N */
return 0;
}
static int hostapd_is_usable_chan(struct hostapd_iface *iface,
int channel, int primary)
{
int i;
struct hostapd_channel_data *chan;
for (i = 0; i < iface->current_mode->num_channels; i++) {
chan = &iface->current_mode->channels[i];
if (chan->chan != channel)
continue;
if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
return 1;
wpa_printf(MSG_DEBUG,
"%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s%s",
primary ? "" : "Configured HT40 secondary ",
i, chan->chan, chan->flag,
chan->flag & HOSTAPD_CHAN_NO_IBSS ? " NO-IBSS" : "",
chan->flag & HOSTAPD_CHAN_PASSIVE_SCAN ?
" PASSIVE-SCAN" : "",
chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
}
return 0;
}
static int hostapd_is_usable_chans(struct hostapd_iface *iface)
{
if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
return 0;
if (!iface->conf->secondary_channel)
return 1;
return hostapd_is_usable_chan(iface, iface->conf->channel +
iface->conf->secondary_channel * 4, 0);
}
static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface *iface)
{
if (iface->conf->channel) {
if (hostapd_is_usable_chans(iface))
return HOSTAPD_CHAN_VALID;
else
return HOSTAPD_CHAN_INVALID;
}
/*
* The user set channel=0 or channel=acs_survey
* which is used to trigger ACS.
*/
switch (acs_init(iface)) {
case HOSTAPD_CHAN_ACS:
return HOSTAPD_CHAN_ACS;
case HOSTAPD_CHAN_VALID:
case HOSTAPD_CHAN_INVALID:
default:
return HOSTAPD_CHAN_INVALID;
}
}
static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
{
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));
hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_WARNING,
"Hardware does not support configured channel");
}
int hostapd_acs_completed(struct hostapd_iface *iface, int err)
{
int ret = -1;
if (err)
goto out;
switch (hostapd_check_chans(iface)) {
case HOSTAPD_CHAN_VALID:
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
ACS_EVENT_COMPLETED "freq=%d channel=%d",
hostapd_hw_get_freq(iface->bss[0],
iface->conf->channel),
iface->conf->channel);
break;
case HOSTAPD_CHAN_ACS:
wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
hostapd_notify_bad_chans(iface);
goto out;
case HOSTAPD_CHAN_INVALID:
default:
wpa_printf(MSG_ERROR, "ACS picked unusable channels");
wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
hostapd_notify_bad_chans(iface);
goto out;
}
ret = hostapd_check_ht_capab(iface);
if (ret < 0)
goto out;
if (ret == 1) {
wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
return 0;
}
ret = 0;
out:
return hostapd_setup_interface_complete(iface, ret);
}
/**
* hostapd_select_hw_mode - Select the hardware mode
* @iface: Pointer to interface data.
* Returns: 0 on success, < 0 on failure
*
* Sets up the hardware mode, channel, rates, and passive scanning
* based on the configuration.
*/
int hostapd_select_hw_mode(struct hostapd_iface *iface)
{
int i;
if (iface->num_hw_features < 1)
return -1;
if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
iface->conf->ieee80211n || iface->conf->ieee80211ac) &&
iface->conf->channel == 14) {
wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14");
iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
iface->conf->ieee80211n = 0;
iface->conf->ieee80211ac = 0;
}
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 == 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) (hw_mode in hostapd.conf)",
(int) iface->conf->hw_mode);
return -2;
}
switch (hostapd_check_chans(iface)) {
case HOSTAPD_CHAN_VALID:
return 0;
case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
return 1;
case HOSTAPD_CHAN_INVALID:
default:
hostapd_notify_bad_chans(iface);
return -3;
}
}
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";
case HOSTAPD_MODE_IEEE80211AD:
return "IEEE 802.11ad";
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;
}