ignore 0-RTT packets

session.go

@@ -477,6 +477,10 @@ func (s *session) handlePacketImpl(p *receivedPacket) bool /* was the packet suc
 		s.logger.Debugf("Dropping packet with unexpected source connection ID: %s (expected %s)", p.hdr.SrcConnectionID, s.destConnID)
 		return false
 	}
+	// drop 0-RTT packets
+	if p.hdr.Type == protocol.PacketType0RTT {
+		return false
+	}
 
 	packet, err := s.unpacker.Unpack(p.hdr, p.data)
 	// if the decryption failed, this might be a packet sent by an attacker
@@ -485,7 +489,6 @@ func (s *session) handlePacketImpl(p *receivedPacket) bool /* was the packet suc
 			s.tryQueueingUndecryptablePacket(p)
 			return false
 		}
-		// TODO: don't close the connection when receiving 0-RTT packets
 		s.closeLocal(err)
 		return false
 	}

session_test.go

@@ -508,6 +508,16 @@ var _ = Describe("Session", func() {
 			Expect(sess.handlePacketImpl(&receivedPacket{hdr: &hdr.Header, data: getData(hdr)})).To(BeTrue())
 		})
 
+		It("ignores 0-RTT packets", func() {
+			Expect(sess.handlePacketImpl(&receivedPacket{
+				hdr: &wire.Header{
+					IsLongHeader:     true,
+					Type:             protocol.PacketType0RTT,
+					DestConnectionID: sess.srcConnID,
+				},
+			})).To(BeFalse())
+		})
+
 		It("ignores packets with a different source connection ID", func() {
 			hdr := &wire.Header{
 				IsLongHeader:     true,