implement the new Retry mechanism

packet_packer.go

@@ -51,9 +51,11 @@ type packetPacker struct {
 
 	perspective protocol.Perspective
 	version     protocol.VersionNumber
-	divNonce    []byte
 	cryptoSetup sealingManager
 
+	token    []byte
+	divNonce []byte
+
 	packetNumberGenerator *packetNumberGenerator
 	getPacketNumberLen    func(protocol.PacketNumber) protocol.PacketNumberLen
 	streams               streamFrameSource
@@ -75,6 +77,7 @@ func newPacketPacker(
 	initialPacketNumber protocol.PacketNumber,
 	getPacketNumberLen func(protocol.PacketNumber) protocol.PacketNumberLen,
 	remoteAddr net.Addr, // only used for determining the max packet size
+	token []byte,
 	divNonce []byte,
 	cryptoSetup sealingManager,
 	streamFramer streamFrameSource,
@@ -97,6 +100,7 @@ func newPacketPacker(
 	return &packetPacker{
 		cryptoSetup:           cryptoSetup,
 		divNonce:              divNonce,
+		token:                 token,
 		destConnID:            destConnID,
 		srcConnID:             srcConnID,
 		perspective:           perspective,
@@ -463,6 +467,7 @@ func (p *packetPacker) getHeader(encLevel protocol.EncryptionLevel) *wire.Header
 		header.PayloadLen = p.maxPacketSize
 		if !p.hasSentPacket && p.perspective == protocol.PerspectiveClient {
 			header.Type = protocol.PacketTypeInitial
+			header.Token = p.token
 		} else {
 			header.Type = protocol.PacketTypeHandshake
 		}