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hostapd: Select a valid secondary channel if both enabled

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When starting AP in HT40 mode and both HT40+ and HT40- options are
specified in hostapd.conf, select a valid secondary channel for the AP
automatically.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Peng Xu 2017-04-20 17:05:25 -07:00 committed by Jouni Malinen
parent da6a28ba60
commit ec27b04e60
3 changed files with 26 additions and 2 deletions
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4
hostapd/config_file.c
View file

@ -1106,6 +1106,10 @@ static int hostapd_config_ht_capab(struct hostapd_config *conf,
conf->ht_capab |= HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
conf->secondary_channel = 1;
}
if (os_strstr(capab, "[HT40+]") && os_strstr(capab, "[HT40-]")) {
conf->ht_capab |= HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
conf->ht40_plus_minus_allowed = 1;
}
if (os_strstr(capab, "[SMPS-STATIC]")) {
conf->ht_capab &= ~HT_CAP_INFO_SMPS_MASK;
conf->ht_capab |= HT_CAP_INFO_SMPS_STATIC;

1
src/ap/ap_config.h
View file

@ -724,6 +724,7 @@ struct hostapd_config {
u8 vht_oper_chwidth;
u8 vht_oper_centr_freq_seg0_idx;
u8 vht_oper_centr_freq_seg1_idx;
u8 ht40_plus_minus_allowed;
/* Use driver-generated interface addresses when adding multiple BSSs */
u8 use_driver_iface_addr;

21
src/ap/hw_features.c
View file

@ -722,14 +722,33 @@ static int hostapd_is_usable_chan(struct hostapd_iface *iface,
static int hostapd_is_usable_chans(struct hostapd_iface *iface)
{
int secondary_chan;
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 +
if (!iface->conf->ht40_plus_minus_allowed)
return hostapd_is_usable_chan(
iface, iface->conf->channel +
iface->conf->secondary_channel * 4, 0);
/* Both HT40+ and HT40- are set, pick a valid secondary channel */
secondary_chan = iface->conf->channel + 4;
if (hostapd_is_usable_chan(iface, secondary_chan, 0)) {
iface->conf->secondary_channel = 1;
return 1;
}
secondary_chan = iface->conf->channel - 4;
if (hostapd_is_usable_chan(iface, secondary_chan, 0)) {
iface->conf->secondary_channel = -1;
return 1;
}
return 0;
}