tokio-quiche: ignore unrecognized cmsgs

evanrittenhouse · evanrittenhouse · commit 6da41ed25932 · 2025-09-23T09:00:17.000-07:00
Router currently processes a variety of cmsgs. It returns an EINVAL if
it encounters a cmsg it doesn't care about. This means that we won't
create an Incoming or send the packet to the corresponding IOW.

Rather than black-holing packets with cmsgs we don't care about, we
should just no-op.
diff --git a/tokio-quiche/src/quic/router/mod.rs b/tokio-quiche/src/quic/router/mod.rs
@@ -527,10 +527,9 @@ where
                                     // messages because
                                     // we set IP_PKTINFO on the socket.
                                 },
-                                _ => {
-                                    return Poll::Ready(
-                                        Err(Errno::EINVAL.into()),
-                                    );
+                                cmsg => {
+                                    let repr = format!("{cmsg:?}");
+                                    log::debug!("received unknown cmsg"; "cmsg"=>repr);
                                 },
                             };
                         }
