QoS of incoming traffic

[akrisfx]

Is there an option to watch the QoS for incoming UDP traffic?
That is, the QoS of traffic is set at the UDP level, but you need to look at the QUIC level.

This is necessary so that we can set QoS for the connection without handshake

[anrossi]

We don't currently expose the IPv4 TypeOfService or IPv6 TrafficClass values from received packets. The trick with providing those is that QUIC is a stream-based protocol, so when multiple packets are received with different ToS/TC values, which one does MsQuic provide to the app? We could provide the most-recently received value fairly easily. Other designs would probably not be desirable due to memory usage or CPU performance sacrifices.

By the way, with this change, you can set the ToS/TC on the outgoing packets on a MsQuic Connection, even before starting the handshake.

If you would like support for received ToS/TC, please file a feature request issue, and if you can, explain how you'd like to handle when you receive different ToS/TC values in different packets.