MINOR: quic: adjust request reject when MUX is already freed
When the MUX is freed, the quic-conn layer may stay active until all
streams acknowledgment are processed. In this interval, if a new stream
is opened by the client, the quic-conn is thus now responsible to handle
it. This is done by the emission of a STOP_SENDING.
This process is closely related to HTTP/3 protocol despite being handled
by the quic-conn layer. This highlights a flaw in our QUIC architecture
which should be adjusted. To reflect this situation, the function
qc_stop_sending_frm_enqueue() is renamed qc_h3_request_reject(). Also,
internal H3 treatment such as uni-directional bypass has been moved
inside the function.
This commit is only a refactor. However, bug fix on next patches will
rely on it so it should be backported up to 2.6.
diff --git a/src/quic_conn.c b/src/quic_conn.c
index 4d22a49..4b1d56c 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -2697,24 +2697,33 @@
TRACE_LEAVE(QUIC_EV_CONN_CLOSE, qc);
}
-/* Enqueue a STOP_SENDING frame to send into 1RTT packet number space
- * frame list to send.
- * Return 1 if succeeded, 0 if not.
+/* Cancel a request on connection <qc> for stream id <id>. This is useful when
+ * the client opens a new stream but the MUX has already been released. A
+ * STOP_SENDING frame is prepared for emission.
+ *
+ * TODO this function is closely related to H3. Its place should be in H3 layer
+ * instead of quic-conn but this requires an architecture adjustment.
+ *
+ * Returns 1 on sucess else 0.
*/
-static int qc_stop_sending_frm_enqueue(struct quic_conn *qc, uint64_t id)
+static int qc_h3_request_reject(struct quic_conn *qc, uint64_t id)
{
int ret = 0;
struct quic_frame *frm;
struct quic_enc_level *qel = &qc->els[QUIC_TLS_ENC_LEVEL_APP];
- uint64_t app_error_code;
+ const uint64_t app_error_code = H3_REQUEST_REJECTED;
TRACE_ENTER(QUIC_EV_CONN_PRSHPKT, qc);
- /* TODO: the mux may be released, we cannot have more
- * information about the application error code to send
- * at this time.
+ /* Do not emit rejection for unknown unidirectional stream as it is
+ * forbidden to close some of them (H3 control stream and QPACK
+ * encoder/decoder streams).
*/
- app_error_code = H3_REQUEST_REJECTED;
+ if (quic_stream_is_uni(id)) {
+ ret = 1;
+ goto out;
+ }
+
frm = qc_frm_alloc(QUIC_FT_STOP_SENDING);
if (!frm) {
TRACE_ERROR("failed to allocate quic_frame", QUIC_EV_CONN_PRSHPKT, qc);
@@ -2935,19 +2944,10 @@
}
else {
TRACE_DEVEL("No mux for new stream", QUIC_EV_CONN_PRSHPKT, qc);
- if (qc->app_ops == &h3_ops && quic_stream_is_uni(stream->id)) {
- /* Do not send STOP_SENDING frames for h3 unidirectional streams.
- * TODO: this test should be removed when the connection closure
- * will be more clean.
- * At quic_conn level there is no mean to know that an application
- * want to forbid stream closure requests to receivers. This is the
- * case for the Control and QPACK h3 unidirectional streams.
- */
- goto leave;
+ if (qc->app_ops == &h3_ops) {
+ if (!qc_h3_request_reject(qc, stream->id))
+ TRACE_ERROR("could not enqueue STOP_SENDING frame", QUIC_EV_CONN_PRSHPKT, qc);
}
-
- if (!qc_stop_sending_frm_enqueue(qc, stream->id))
- TRACE_ERROR("could not enqueue STOP_SENDING frame", QUIC_EV_CONN_PRSHPKT, qc);
/* This packet will not be acknowledged */
goto leave;
}