Move receiverCreator to new file

iface/bind/receiver_creator.go

@@ -0,0 +1,23 @@
+package bind
+
+import (
+	"net"
+	"sync"
+
+	"golang.org/x/net/ipv4"
+	wgConn "golang.zx2c4.com/wireguard/conn"
+)
+
+type receiverCreator struct {
+	iceBind *ICEBind
+}
+
+func newReceiverCreator(iceBind *ICEBind) receiverCreator {
+	return receiverCreator{
+		iceBind: iceBind,
+	}
+}
+
+func (rc receiverCreator) CreateIPv4ReceiverFn(msgPool *sync.Pool, pc *ipv4.PacketConn, conn *net.UDPConn) wgConn.ReceiveFunc {
+	return rc.iceBind.createIPv4ReceiverFn(msgPool, pc, conn)
+}