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implement the max_datagram_frame_size transport parameter

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This commit is contained in:
Marten Seemann 2019-10-06 10:13:10 +02:00
parent d6eff22f9a
commit 021f70aac5
3 changed files with 27 additions and 13 deletions
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30
internal/wire/transport_parameters.go
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@ -42,6 +42,8 @@ const (
activeConnectionIDLimitParameterID transportParameterID = 0xe
initialSourceConnectionIDParameterID transportParameterID = 0xf
retrySourceConnectionIDParameterID transportParameterID = 0x10
// https://datatracker.ietf.org/doc/draft-ietf-quic-datagram/
maxDatagramFrameSizeParameterID transportParameterID = 0x20
)
// PreferredAddress is the value encoding in the preferred_address transport parameter
@ -81,6 +83,8 @@ type TransportParameters struct {
StatelessResetToken *protocol.StatelessResetToken
ActiveConnectionIDLimit uint64
MaxDatagramFrameSize protocol.ByteCount
}
// Unmarshal the transport parameters
@ -96,12 +100,14 @@ func (p *TransportParameters) unmarshal(r *bytes.Reader, sentBy protocol.Perspec
var parameterIDs []transportParameterID
var (
readAckDelayExponent bool
readMaxAckDelay bool
readOriginalDestinationConnectionID bool
readInitialSourceConnectionID bool
)
p.AckDelayExponent = protocol.DefaultAckDelayExponent
p.MaxAckDelay = protocol.DefaultMaxAckDelay
p.MaxDatagramFrameSize = protocol.InvalidByteCount
for r.Len() > 0 {
paramIDInt, err := utils.ReadVarInt(r)
if err != nil {
@ -118,12 +124,10 @@ func (p *TransportParameters) unmarshal(r *bytes.Reader, sentBy protocol.Perspec
parameterIDs = append(parameterIDs, paramID)
switch paramID {
case ackDelayExponentParameterID:
readAckDelayExponent = true
if err := p.readNumericTransportParameter(r, paramID, int(paramLen)); err != nil {
return err
}
case maxAckDelayParameterID:
readMaxAckDelay = true
if err := p.readNumericTransportParameter(r, paramID, int(paramLen)); err != nil {
return err
}
@ -135,7 +139,8 @@ func (p *TransportParameters) unmarshal(r *bytes.Reader, sentBy protocol.Perspec
initialMaxStreamsUniParameterID,
maxIdleTimeoutParameterID,
maxUDPPayloadSizeParameterID,
activeConnectionIDLimitParameterID:
activeConnectionIDLimitParameterID,
maxDatagramFrameSizeParameterID:
if err := p.readNumericTransportParameter(r, paramID, int(paramLen)); err != nil {
return err
}
@ -185,12 +190,6 @@ func (p *TransportParameters) unmarshal(r *bytes.Reader, sentBy protocol.Perspec
if sentBy == protocol.PerspectiveServer && !readOriginalDestinationConnectionID {
return errors.New("missing original_destination_connection_id")
}
if !readAckDelayExponent {
p.AckDelayExponent = protocol.DefaultAckDelayExponent
}
if !readMaxAckDelay {
p.MaxAckDelay = protocol.DefaultMaxAckDelay
}
if p.MaxUDPPayloadSize == 0 {
p.MaxUDPPayloadSize = protocol.MaxByteCount
}
@ -305,6 +304,8 @@ func (p *TransportParameters) readNumericTransportParameter(
p.MaxAckDelay = maxAckDelay
case activeConnectionIDLimitParameterID:
p.ActiveConnectionIDLimit = val
case maxDatagramFrameSizeParameterID:
p.MaxDatagramFrameSize = protocol.ByteCount(val)
default:
return fmt.Errorf("TransportParameter BUG: transport parameter %d not found", paramID)
}
@ -391,6 +392,9 @@ func (p *TransportParameters) Marshal(pers protocol.Perspective) []byte {
utils.WriteVarInt(b, uint64(p.RetrySourceConnectionID.Len()))
b.Write(p.RetrySourceConnectionID.Bytes())
}
if p.MaxDatagramFrameSize != protocol.InvalidByteCount {
p.marshalVarintParam(b, maxDatagramFrameSizeParameterID, uint64(p.MaxDatagramFrameSize))
}
return b.Bytes()
}
@ -463,6 +467,10 @@ func (p *TransportParameters) String() string {
logString += ", StatelessResetToken: %#x"
logParams = append(logParams, *p.StatelessResetToken)
}
if p.MaxDatagramFrameSize != protocol.InvalidByteCount {
logString += ", MaxDatagramFrameSize: %d"
logParams = append(logParams, p.MaxDatagramFrameSize)
}
logString += "}"
return fmt.Sprintf(logString, logParams...)
}