|
|
@@ -759,6 +759,13 @@ func (conn *ObfuscatedPacketConn) writePacket(
|
|
|
// There's no special case for legacy gQUIC, even though it lacks
|
|
|
// packet size adjustments, since gQUIC has a hard max packet size of
|
|
|
// 1280 bytes, less than the limit checked here.
|
|
|
+
|
|
|
+ // Limitation: on Linux, with GSO enabled, standard quic-go can call
|
|
|
+ // WriteTo with oversized packets which are then split in the kernel.
|
|
|
+ // These oversized writes would exceed the MAX_PACKET_SIZE length
|
|
|
+ // check. Furthermore, writePacket doesn't handle obfuscating GSO
|
|
|
+ // writes. Psiphon-Labs/quic-go currently disables GSO.
|
|
|
+
|
|
|
if n > MAX_PACKET_SIZE-OBFUSCATED_MAX_PACKET_SIZE_ADJUSTMENT {
|
|
|
return 0, 0, newTemporaryNetError(errors.Tracef(
|
|
|
"unexpected QUIC packet length: %d", n))
|
Rod Hynes