ignore repeated ACKs in legacy SentPacketHandler

ref #218
2016-07-13 21:57:19 +08:00
parent 38098954f4
commit 21746d7e06
2 changed files with 18 additions and 0 deletions
--- a/ackhandlerlegacy/sent_packet_handler.go
+++ b/ackhandlerlegacy/sent_packet_handler.go
@@ -184,6 +184,11 @@ func (h *sentPacketHandler) ReceivedAck(ackFrame *frames.AckFrameLegacy, withPac

 	h.largestReceivedPacketWithAck = withPacketNumber

+	// ignore repeated ACK (ACKs that don't have a higher LargestObserved than the last ACK)
+	if ackFrame.LargestObserved <= h.highestInOrderAckedPacketNumber {
+		return nil
+	}
+
 	expectedEntropy, err := h.calculateExpectedEntropy(ackFrame)
 	if err != nil {
 		return err