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drop duplicate packets

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Duplicate detection uses the same data structure that is used to track
received packets to generate ACK frames. That means that after an old
ACK range has been pruned, a severly delayed packet might be incorrectly
detected as a duplicate.
As we wouldn't have acknowledged receipt of this packet, this situation
would have resulted in a retransmission by the peer anyway, so dropping
the packet won't cause a big regression.
This commit is contained in:
Marten Seemann
2020-05-27 09:20:51 +07:00
parent fd5ecee85d
commit 440ff107a3
10 changed files with 170 additions and 4 deletions
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internal/ackhandler/interfaces.go
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@@ -60,6 +60,7 @@ type sentPacketTracker interface {
// ReceivedPacketHandler handles ACKs needed to send for incoming packets
type ReceivedPacketHandler interface {
IsPotentiallyDuplicate(protocol.PacketNumber, protocol.EncryptionLevel) bool
ReceivedPacket(pn protocol.PacketNumber, encLevel protocol.EncryptionLevel, rcvTime time.Time, shouldInstigateAck bool) error
DropPackets(protocol.EncryptionLevel)