function freq_to_chan {
	local freq=$1

	if [[ $freq -ge 2412 && $freq -le 2472 ]]; then
		band="11g"
		chan=$(( ($freq - 2412) / 5 + 1 ))
	else
		band="11a"
		chan=$(( ($freq - 5000) / 5 ))
	fi
	echo "$chan $band"
}


function meshup-iw {
	local if=$1
	local meshid=$2
	local freq=$3
	local ip=$4

	ip link set $if down
	iw dev $if set type mp
	ip link set $if up
	iw dev $if mesh join $meshid freq $freq
	ip addr add $ip/24 dev $if 2>/dev/null
}

function meshup-wpas-open {
	local if=$1
	local meshid=$2
	local freq=$3
	local ip=$4

	ip link set $if down
	iw dev $if set type mp
	ip link set $if up

	cat<<EOM > /tmp/wpas-$if.conf
network={
	ssid="wmediumd-mesh"
	mode=5
	frequency=$freq
	key_mgmt=NONE
}
EOM
	wpa_supplicant -i $if -c /tmp/wpas-$if.conf &
	ip addr add $ip/24 dev $if 2>/dev/null
}

function meshup-wpas {
	local if=$1;
	local meshid=$2;
	local freq=$3;
	local ip=$4;

	ip link set $if down
	iw dev $if set type mp
	ip link set $if up

	cat<<EOM > /tmp/wpas-$if.conf
network={
	ssid="wmediumd-mesh-sec"
	mode=5
	frequency=$freq
	key_mgmt=SAE
	psk="some passphrase"
}
EOM
	wpa_supplicant -i $if -c /tmp/wpas-$if.conf &
	ip addr add $ip/24 dev $if 2>/dev/null
}

function meshup-authsae {
	local if=$1;
	local meshid=$2;
	local freq=$3;
	local ip=$4;

	ip link set $if down
	iw dev $if set type mp
	ip link set $if up

	chan_params=$(freq_to_chan $freq)
	read -ra ch <<< "$chan_params"

	cat<<EOM > /tmp/authsae-$if.conf
authsae:
{
 sae:
  {
    debug = 480;
    password = "some passphrase";
    group = [19, 26, 21, 25, 20];
    blacklist = 5;
    thresh = 5;
    lifetime = 3600;
  };
 meshd:
  {
    meshid = "wmediumd-mesh-sec";
    interface = "wlan0";
    passive = 0;
    secured = 1;
    debug = 1;
    mediaopt = 1;
    band = "${ch[1]}";
    channel = ${ch[0]};
  };
};
EOM
	meshd-nl80211 -i $if -c /tmp/authsae-$if.conf &
	ip addr add $ip/24 dev $if 2>/dev/null
}

function addr2phy {
	local addr=$1;
	grep -l $addr /sys/class/ieee80211/phy*/macaddress | \
		awk -F '/' '{print $(NF-1)}'
}