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check that the client doesn't switch back to 0-RTT after sending 1-RTT

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This commit is contained in:
Marten Seemann 2019-08-10 21:40:10 +07:00
parent c79dfe77b8
commit 40a993e31c
5 changed files with 46 additions and 20 deletions
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17
internal/ackhandler/received_packet_handler.go
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@ -35,6 +35,8 @@ type receivedPacketHandler struct {
initialPackets *receivedPacketTracker
handshakePackets *receivedPacketTracker
appDataPackets *receivedPacketTracker
lowest1RTTPacket protocol.PacketNumber
}
var _ ReceivedPacketHandler = &receivedPacketHandler{}
@ -49,6 +51,7 @@ func NewReceivedPacketHandler(
initialPackets: newReceivedPacketTracker(rttStats, logger, version),
handshakePackets: newReceivedPacketTracker(rttStats, logger, version),
appDataPackets: newReceivedPacketTracker(rttStats, logger, version),
lowest1RTTPacket: protocol.InvalidPacketNumber,
}
}
@ -57,18 +60,26 @@ func (h *receivedPacketHandler) ReceivedPacket(
encLevel protocol.EncryptionLevel,
rcvTime time.Time,
shouldInstigateAck bool,
) {
) error {
switch encLevel {
case protocol.EncryptionInitial:
h.initialPackets.ReceivedPacket(pn, rcvTime, shouldInstigateAck)
case protocol.EncryptionHandshake:
h.handshakePackets.ReceivedPacket(pn, rcvTime, shouldInstigateAck)
case protocol.Encryption0RTT, protocol.Encryption1RTT:
// TODO: implement a check that the client doesn't switch back to 0-RTT after sending a 1-RTT packet
case protocol.Encryption0RTT:
if h.lowest1RTTPacket != protocol.InvalidPacketNumber && pn > h.lowest1RTTPacket {
return fmt.Errorf("received packet number %d on a 0-RTT packet after receiving %d on a 1-RTT packet", pn, h.lowest1RTTPacket)
}
h.appDataPackets.ReceivedPacket(pn, rcvTime, shouldInstigateAck)
case protocol.Encryption1RTT:
if h.lowest1RTTPacket == protocol.InvalidPacketNumber || pn < h.lowest1RTTPacket {
h.lowest1RTTPacket = pn
}
h.appDataPackets.ReceivedPacket(pn, rcvTime, shouldInstigateAck)
default:
panic(fmt.Sprintf("received packet with unknown encryption level: %s", encLevel))
}
return nil
}
// only to be used with 1-RTT packets