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ACS/DFS: Support min_tx_power configuration

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If min_tx_power is specified (default 0 dBm, i.e., no constraint), ACS
and DFS will not consider channels whose available max_tx_power is less
than the configured value.

This may be useful to exclude SRD (Short Range Device) channels which
may be limited to 13.9 dBm (25 mW) in some regulatory domains.

Signed-off-by: Alan Young <consult.awy@gmail.com>
This commit is contained in:
Alan Young 2021-11-11 16:40:05 +00:00 • committed by Jouni Malinen
parent a6422a860d
commit 5ef9277d0b
6 changed files with 29 additions and 1 deletions
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10
hostapd/config_file.c
View file

@ -3193,6 +3193,16 @@ static int hostapd_config_fill(struct hostapd_config *conf,
conf->acs_freq_list_present = 1;
} else if (os_strcmp(buf, "acs_exclude_6ghz_non_psc") == 0) {
conf->acs_exclude_6ghz_non_psc = atoi(pos);
} else if (os_strcmp(buf, "min_tx_power") == 0) {
int val = atoi(pos);
if (val < 0 || val > 255) {
wpa_printf(MSG_ERROR,
"Line %d: invalid min_tx_power %d (expected 0..255)",
line, val);
return 1;
}
conf->min_tx_power = val;
} else if (os_strcmp(buf, "beacon_int") == 0) {
int val = atoi(pos);
/* MIB defines range as 1..65535, but very small values

4
hostapd/hostapd.conf
View file

@ -225,6 +225,10 @@ channel=1
# Default behavior is to include all PSC and non-PSC channels.
#acs_exclude_6ghz_non_psc=1
# Set minimum permitted max TX power (in dBm) for ACS and DFS channel selection.
# (default 0, i.e., not constraint)
#min_tx_power=20
# Beacon interval in kus (1.024 ms) (default: 100; range 15..65535)
beacon_int=100