Logs for mptcp status

src/core/link.go

@@ -463,6 +463,12 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 			if err != nil {
 				return
 			}
+			if u.Scheme == "mptcp" {
+				isMultipathTCP, err := conn.(*net.TCPConn).MultipathTCP() // Check if the connection supports mptcp
+				l.core.log.Infof("Accepted connection from %s with mptcp: %t, err: %v\n", conn.RemoteAddr(), isMultipathTCP, err)
+			} else {
+				l.core.log.Warnf("MultipathTCP is not on. TCP will be used.")
+			}
 			go func(conn net.Conn) {
 				defer conn.Close()
 

src/core/link_mptcp.go

@@ -108,6 +108,11 @@ func (l *linkMPTCP) dialerFor(dst *net.TCPAddr, sintf string) (*net.Dialer, erro
 		Control:   l.tcp.tcpContext,
 	}
 	dialer.SetMultipathTCP(true)
+	if dialer.MultipathTCP() {
+		l.core.log.Infof("Enabled MPTCP")
+	} else {
+		l.core.log.Warnf("MultipathTCP is not on after having been forced to on. TCP will be used.")
+	}
 	if sintf != "" {
 		dialer.Control = l.tcp.getControl(sintf)
 		ief, err := net.InterfaceByName(sintf)