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

packets/dot11.go

@@ -3,6 +3,7 @@ package packets
 import (
 	"net"
 
+	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
 )
 
@@ -27,3 +28,27 @@ func NewDot11Deauth(a1 net.HardwareAddr, a2 net.HardwareAddr, a3 net.HardwareAdd
 		&deauth,
 	)
 }
+
+func Dot11Parse(packet gopacket.Packet) (ok bool, radiotap *layers.RadioTap, dot11 *layers.Dot11) {
+	ok = false
+	radiotap = nil
+	dot11 = nil
+
+	radiotapLayer := packet.Layer(layers.LayerTypeRadioTap)
+	if radiotapLayer == nil {
+		return
+	}
+	radiotap, ok = radiotapLayer.(*layers.RadioTap)
+	if ok == false || radiotap == nil {
+		return
+	}
+
+	dot11Layer := packet.Layer(layers.LayerTypeDot11)
+	if dot11Layer == nil {
+		ok = false
+		return
+	}
+
+	dot11, ok = dot11Layer.(*layers.Dot11)
+	return
+}