refactor(forwarder): remove CreateForwardedTCPIPPayload method

- OpenForwardedChannel now privately calls CreateForwardedTCPIPPayload
- Removed an unused function

internal/transport/tcp.go

@@ -18,8 +18,7 @@ type tcp struct {
 }
 
 type Forwarder interface {
-	CreateForwardedTCPIPPayload(origin net.Addr) []byte
-	OpenForwardedChannel(ctx context.Context, payload []byte) (ssh.Channel, <-chan *ssh.Request, error)
+	OpenForwardedChannel(ctx context.Context, origin net.Addr) (ssh.Channel, <-chan *ssh.Request, error)
 	HandleConnection(dst io.ReadWriter, src ssh.Channel)
 }
 
@@ -55,10 +54,9 @@ func (tt *tcp) handleTcp(conn net.Conn) {
 			log.Printf("Failed to close connection: %v", err)
 		}
 	}()
-	payload := tt.forwarder.CreateForwardedTCPIPPayload(conn.RemoteAddr())
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	defer cancel()
-	channel, reqs, err := tt.forwarder.OpenForwardedChannel(ctx, payload)
+	channel, reqs, err := tt.forwarder.OpenForwardedChannel(ctx, conn.RemoteAddr())
 	if err != nil {
 		log.Printf("Failed to open forwarded-tcpip channel: %v", err)
 		return