misc: small fix or general refactoring i did not bother commenting

network/net.go

@@ -26,6 +26,24 @@ var (
 	IPv4Validator = regexp.MustCompile("^[0-9\\.]+/?\\d*$")
 )
 
+func IsZeroMac(mac net.HardwareAddr) bool {
+	for _, b := range mac {
+		if b != 0x00 {
+			return false
+		}
+	}
+	return true
+}
+
+func IsBroadcastMac(mac net.HardwareAddr) bool {
+	for _, b := range mac {
+		if b != 0xff {
+			return false
+		}
+	}
+	return true
+}
+
 func NormalizeMac(mac string) string {
 	var parts []string
 	if strings.ContainsRune(mac, '-') {

network/wifi.go

@@ -7,6 +7,17 @@ import (
 	"time"
 )
 
+func Dot11Freq2Chan(freq int) int {
+	if freq <= 2472 {
+		return ((freq - 2412) / 5) + 1
+	} else if freq == 2484 {
+		return 14
+	} else if freq >= 5035 && freq <= 5865 {
+		return ((freq - 5035) / 5) + 7
+	}
+	return 0
+}
+
 type APNewCallback func(ap *AccessPoint)
 type APLostCallback func(ap *AccessPoint)