hostap/src/common/hw_features_common.c

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/*
* Common hostapd/wpa_supplicant HW features
* Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
* Copyright (c) 2015, Qualcomm Atheros, Inc.
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "defs.h"
#include "ieee802_11_defs.h"
#include "ieee802_11_common.h"
#include "hw_features_common.h"
struct hostapd_channel_data * hw_get_channel_chan(struct hostapd_hw_modes *mode,
int chan, int *freq)
{
int i;
if (freq)
*freq = 0;
if (!mode)
return NULL;
for (i = 0; i < mode->num_channels; i++) {
struct hostapd_channel_data *ch = &mode->channels[i];
if (ch->chan == chan) {
if (freq)
*freq = ch->freq;
return ch;
}
}
return NULL;
}
struct hostapd_channel_data * hw_get_channel_freq(struct hostapd_hw_modes *mode,
int freq, int *chan)
{
int i;
if (chan)
*chan = 0;
if (!mode)
return NULL;
for (i = 0; i < mode->num_channels; i++) {
struct hostapd_channel_data *ch = &mode->channels[i];
if (ch->freq == freq) {
if (chan)
*chan = ch->chan;
return ch;
}
}
return NULL;
}
int hw_get_freq(struct hostapd_hw_modes *mode, int chan)
{
int freq;
hw_get_channel_chan(mode, chan, &freq);
return freq;
}
int hw_get_chan(struct hostapd_hw_modes *mode, int freq)
{
int chan;
hw_get_channel_freq(mode, freq, &chan);
return chan;
}
int allowed_ht40_channel_pair(struct hostapd_hw_modes *mode, int pri_chan,
int sec_chan)
{
int ok, j, first;
int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
184, 192 };
size_t k;
if (pri_chan == sec_chan || !sec_chan)
return 1; /* HT40 not used */
wpa_printf(MSG_DEBUG,
"HT40: control channel: %d secondary channel: %d",
pri_chan, sec_chan);
/* Verify that HT40 secondary channel is an allowed 20 MHz
* channel */
ok = 0;
for (j = 0; j < mode->num_channels; j++) {
struct hostapd_channel_data *chan = &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 (mode->mode != HOSTAPD_MODE_IEEE80211A)
return 1;
first = pri_chan < sec_chan ? pri_chan : 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",
pri_chan, sec_chan);
return 0;
}
return 1;
}
void 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;
}
}
}