DATAGRAM frame too large error

[derrandz]

Hi,

In one my test cases where I am trying to send large TCP/UDP packets over the http3 raw quic connection to the other side, I get this when I try to write the packet to the connection

DATAGRAM frame too large

The actual packet size I was trying to send was 1440.

Also after reading through the code, the trigger case that is supposed to be executed in case of a large datagram is not being executed because of

connect-ip-go/conn.go

Line 352 in 321f13c

if errors.Is(err, &quic.DatagramTooLargeError{}) {

because

  errors.Is(&quic.DatagramTooLargeError{MaxDatagramPayloadSize: 1280}, &quic.DatagramTooLargeError{})

is always false. So the icmp packet that's supposed to return on such case is not being returned. Is that the intended case or is there another case where MaxDatagramPayloadSize = 0 thus the if succeeds?

Waiting for the fix.