Refactor: return ID copy in TCP/UDPConn

Author: xjasonlyu

core/adapter/adapter.go

@@ -11,7 +11,7 @@ type TCPConn interface {
 	net.Conn
 
 	// ID returns the transport endpoint id of TCPConn.
-	ID() *stack.TransportEndpointID
+	ID() stack.TransportEndpointID
 }
 
 // UDPConn implements net.Conn and net.PacketConn.
@@ -20,5 +20,5 @@ type UDPConn interface {
 	net.PacketConn
 
 	// ID returns the transport endpoint id of UDPConn.
-	ID() *stack.TransportEndpointID
+	ID() stack.TransportEndpointID
 }

core/tcp.go

@@ -117,6 +117,6 @@ type tcpConn struct {
 	id stack.TransportEndpointID
 }
 
-func (c *tcpConn) ID() *stack.TransportEndpointID {
-	return &c.id
+func (c *tcpConn) ID() stack.TransportEndpointID {
+	return c.id
 }

core/udp.go

@@ -42,6 +42,6 @@ type udpConn struct {
 	id stack.TransportEndpointID
 }
 
-func (c *udpConn) ID() *stack.TransportEndpointID {
-	return &c.id
+func (c *udpConn) ID() stack.TransportEndpointID {
+	return c.id
 }