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TUN-6726: Fix maxDatagramPayloadSize for Windows QUIC datagrams

This commit is contained in:
Nuno Diegues 2022-09-01 18:50:25 +01:00
parent 4ac68711cd
commit 7ca5f7569a
2 changed files with 8 additions and 7 deletions
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13
quic/datagramv2.go
View File

@ -14,14 +14,15 @@ import (
type datagramV2Type byte
const (
udp datagramV2Type = iota
typeIDLen = 1
udp datagramV2Type = iota
ip
// Same as sessionDemuxChan capacity
packetChanCapacity = 16
)
func suffixType(b []byte, datagramType datagramV2Type) ([]byte, error) {
if len(b)+1 > MaxDatagramFrameSize {
if len(b)+typeIDLen > MaxDatagramFrameSize {
return nil, fmt.Errorf("datagram size %d exceeds max frame size %d", len(b), MaxDatagramFrameSize)
}
b = append(b, byte(datagramType))
@ -114,11 +115,11 @@ func (dm *DatagramMuxerV2) ReceivePacket(ctx context.Context) (packet.RawPacket,
}
func (dm *DatagramMuxerV2) demux(ctx context.Context, msgWithType []byte) error {
if len(msgWithType) < 1 {
return fmt.Errorf("QUIC datagram should have at least 1 byte")
if len(msgWithType) < typeIDLen {
return fmt.Errorf("QUIC datagram should have at least %d byte", typeIDLen)
}
msgType := datagramV2Type(msgWithType[len(msgWithType)-1])
msg := msgWithType[0 : len(msgWithType)-1]
msgType := datagramV2Type(msgWithType[len(msgWithType)-typeIDLen])
msg := msgWithType[0 : len(msgWithType)-typeIDLen]
switch msgType {
case udp:
return dm.handleSession(ctx, msg)

2
quic/param_windows.go
View File

@ -7,5 +7,5 @@ const (
// 1220 is the default value https://github.com/lucas-clemente/quic-go/blob/84e03e59760ceee37359688871bb0688fcc4e98f/internal/protocol/params.go#L138
MaxDatagramFrameSize = 1220
// 3 more bytes are reserved at https://github.com/lucas-clemente/quic-go/blob/v0.24.0/internal/wire/datagram_frame.go#L61
maxDatagramPayloadSize = MaxDatagramFrameSize - 3 - sessionIDLen
maxDatagramPayloadSize = MaxDatagramFrameSize - 3 - sessionIDLen - typeIDLen
)