more conn migration

src/yggdrasil/conn.go

@@ -61,6 +61,7 @@ type Conn struct {
 	nodeID        *crypto.NodeID
 	nodeMask      *crypto.NodeID
 	session       *sessionInfo
+	mtu           uint16
 }
 
 // TODO func NewConn() that initializes additional fields as needed
@@ -80,6 +81,10 @@ func (c *Conn) String() string {
 	return s
 }
 
+func (c *Conn) setMTU(from phony.IActor, mtu uint16) {
+	c.EnqueueFrom(from, func() { c.mtu = mtu })
+}
+
 // This should never be called from the router goroutine, used in the dial functions
 func (c *Conn) search() error {
 	var sinfo *searchInfo
@@ -112,6 +117,7 @@ func (c *Conn) search() error {
 			for i := range c.nodeMask {
 				c.nodeMask[i] = 0xFF
 			}
+			c.session.conn = c
 		}
 		return err
 	} else {
@@ -120,7 +126,7 @@ func (c *Conn) search() error {
 	return nil
 }
 
-// Used in session keep-alive traffic in Conn.Write
+// Used in session keep-alive traffic
 func (c *Conn) doSearch() {
 	routerWork := func() {
 		// Check to see if there is a search already matching the destination
@@ -134,7 +140,7 @@ func (c *Conn) doSearch() {
 			sinfo.continueSearch()
 		}
 	}
-	go c.core.router.doAdmin(routerWork)
+	c.core.router.EnqueueFrom(c.session, routerWork)
 }
 
 func (c *Conn) _getDeadlineCancellation(t *time.Time) (util.Cancellation, bool) {
@@ -187,16 +193,14 @@ func (c *Conn) Read(b []byte) (int, error) {
 	return n, err
 }
 
-// Used internally by Write, the caller must not reuse the argument bytes when no error occurs
+func (c *Conn) _write(msg FlowKeyMessage) error {
-func (c *Conn) WriteNoCopy(msg FlowKeyMessage) error {
+	if len(msg.Message) > int(c.mtu) {
-	var err error
+		return ConnError{errors.New("packet too big"), true, false, false, int(c.mtu)}
-	sessionFunc := func() {
-		// Does the packet exceed the permitted size for the session?
-		if uint16(len(msg.Message)) > c.session._getMTU() {
-			err = ConnError{errors.New("packet too big"), true, false, false, int(c.session._getMTU())}
-			return
 	}
-		// The rest of this work is session keep-alive traffic
+	c.session.EnqueueFrom(c, func() {
+		// Send the packet
+		c.session._send(msg)
+		// Session keep-alive, while we wait for the crypto workers from send
 		switch {
 		case time.Since(c.session.time) > 6*time.Second:
 			if c.session.time.Before(c.session.pingTime) && time.Since(c.session.pingTime) > 6*time.Second {
@@ -209,15 +213,16 @@ func (c *Conn) WriteNoCopy(msg FlowKeyMessage) error {
 			c.session.ping(c.session) // TODO send from self if this becomes an actor
 		default: // Don't do anything, to keep traffic throttled
 		}
+	})
+	return nil
 }
-	c.session.doFunc(sessionFunc)
+
-	if err == nil {
+// Used internally by Write, the caller must not reuse the argument bytes when no error occurs
+func (c *Conn) WriteNoCopy(msg FlowKeyMessage) error {
 	var cancel util.Cancellation
 	var doCancel bool
 	<-c.SyncExec(func() { cancel, doCancel = c._getDeadlineCancellation(c.writeDeadline) })
-		if doCancel {
+	var err error
-			defer cancel.Cancel(nil)
-		}
 	select {
 	case <-cancel.Finished():
 		if cancel.Error() == util.CancellationTimeoutError {
@@ -225,8 +230,8 @@ func (c *Conn) WriteNoCopy(msg FlowKeyMessage) error {
 		} else {
 			err = ConnError{errors.New("session closed"), false, false, true, 0}
 		}
-		case <-c.session.SyncExec(func() { c.session._send(msg) }):
+	default:
-		}
+		<-c.SyncExec(func() { err = c._write(msg) })
 	}
 	return err
 }

src/yggdrasil/dialer.go

@@ -65,6 +65,7 @@ func (d *Dialer) DialByNodeIDandMask(nodeID, nodeMask *crypto.NodeID) (*Conn, er
 		conn.Close()
 		return nil, err
 	}
+	conn.session.setConn(nil, conn)
 	t := time.NewTimer(6 * time.Second) // TODO use a context instead
 	defer t.Stop()
 	select {

src/yggdrasil/session.go

@@ -71,6 +71,7 @@ type sessionInfo struct {
 	init           chan struct{}                 // Closed when the first session pong arrives, used to signal that the session is ready for initial use
 	cancel         util.Cancellation             // Used to terminate workers
 	toConn         chan []byte                   // Decrypted packets go here, picked up by the associated Conn
+	conn           *Conn                         // The associated Conn object
 	callbacks      []chan func()                 // Finished work from crypto workers
 }
 
@@ -112,6 +113,9 @@ func (s *sessionInfo) _update(p *sessionPing) bool {
 	}
 	if p.MTU >= 1280 || p.MTU == 0 {
 		s.theirMTU = p.MTU
+		if s.conn != nil {
+			s.conn.setMTU(s, s._getMTU())
+		}
 	}
 	if !bytes.Equal(s.coords, p.Coords) {
 		// allocate enough space for additional coords
@@ -368,6 +372,13 @@ func (sinfo *sessionInfo) _sendPingPong(isPong bool) {
 	}
 }
 
+func (sinfo *sessionInfo) setConn(from phony.IActor, conn *Conn) {
+	sinfo.EnqueueFrom(from, func() {
+		sinfo.conn = conn
+		sinfo.conn.setMTU(sinfo, sinfo._getMTU())
+	})
+}
+
 // Handles a session ping, creating a session if needed and calling update, then possibly responding with a pong if the ping was in ping mode and the update was successful.
 // If the session has a packet cached (common when first setting up a session), it will be sent.
 func (ss *sessions) handlePing(ping *sessionPing) {
@@ -390,6 +401,7 @@ func (ss *sessions) handlePing(ping *sessionPing) {
 			for i := range conn.nodeMask {
 				conn.nodeMask[i] = 0xFF
 			}
+			sinfo.setConn(ss.router, conn)
 			c := ss.listener.conn
 			go func() { c <- conn }()
 		}