refact: some refactoring to the ipv6 stuff

packets/dhcp6_layer.go

@@ -0,0 +1,19 @@
+package packets
+
+import (
+	"github.com/google/gopacket"
+)
+
+type DHCPv6Layer struct {
+	Raw []byte
+}
+
+func (l DHCPv6Layer) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(len(l.Raw))
+	if err != nil {
+		return err
+	}
+
+	copy(bytes, l.Raw)
+	return nil
+}