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Introduce common allowed_ht40_channel_pair()

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This can be used from hostapd/wpa_supplicant.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
This commit is contained in:
Janusz Dziedzic 2015-01-08 12:48:31 +01:00 committed by Jouni Malinen
parent 5f10b7f498
commit 514427437a
3 changed files with 68 additions and 55 deletions
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58
src/ap/hw_features.c
View file

@ -224,66 +224,16 @@ int hostapd_prepare_rates(struct hostapd_iface *iface,
#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;
int pri_chan, sec_chan;
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);
pri_chan = iface->conf->channel;
sec_chan = pri_chan + iface->conf->secondary_channel * 4;
/* 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",
return allowed_ht40_channel_pair(iface->current_mode, pri_chan,
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;
}

60
src/common/hw_features_common.c
View file

@ -80,3 +80,63 @@ int hw_get_chan(struct hostapd_hw_modes *mode, int freq)
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;
}

3
src/common/hw_features_common.h
View file

@ -20,4 +20,7 @@ struct hostapd_channel_data * hw_get_channel_freq(struct hostapd_hw_modes *mode,
int hw_get_freq(struct hostapd_hw_modes *mode, int chan);
int hw_get_chan(struct hostapd_hw_modes *mode, int freq);
int allowed_ht40_channel_pair(struct hostapd_hw_modes *mode, int pri_chan,
int sec_chan);
#endif /* HW_FEATURES_COMMON_H */