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MINOR: mux-quic: support stream opening via MAX_STREAM_DATA

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MAX_STREAM_DATA can be used as the first frame of a stream. In this
case, the stream should be opened, if it respects flow-control limit. To
implement this, simply replace plain lookup in stream tree by
qcc_get_qcs() at the start of the parsing function. This automatically
takes care of opening the stream if not already done.

As specified by RFC 9000, if MAX_STREAM_DATA is receive for a
receive-only stream, a STREAM_STATE_ERROR connection error is emitted.
This commit is contained in:
Amaury Denoyelle 2022-07-06 15:45:20 +02:00
parent 57161b7d0c
commit b68559a9aa
2 changed files with 20 additions and 7 deletions
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21
src/mux_quic.c
View File

@ -762,18 +762,29 @@ int qcc_recv_max_data(struct qcc *qcc, uint64_t max)
/* Handle a new MAX_STREAM_DATA frame. <max> must contains the maximum data
* field of the frame and <id> is the identifier of the QUIC stream.
*
* Returns 0 on success else non-zero.
* Returns 0 on success else non-zero. On error, the received frame should not
* be acknowledged.
*/
int qcc_recv_max_stream_data(struct qcc *qcc, uint64_t id, uint64_t max)
{
struct qcs *qcs;
struct eb64_node *node;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
node = eb64_lookup(&qcc->streams_by_id, id);
if (node) {
qcs = eb64_entry(node, struct qcs, by_id);
/* RFC 9000 19.10. MAX_STREAM_DATA Frames
*
* Receiving a MAX_STREAM_DATA frame for a locally
* initiated stream that has not yet been created MUST be treated as a
* connection error of type STREAM_STATE_ERROR. An endpoint that
* receives a MAX_STREAM_DATA frame for a receive-only stream MUST
* terminate the connection with error STREAM_STATE_ERROR.
*/
if (qcc_get_qcs(qcc, id, 0, 1, &qcs)) {
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
if (qcs) {
if (max > qcs->tx.msd) {
qcs->tx.msd = max;
TRACE_DEVEL("increase remote max-stream-data", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);

6
src/xprt_quic.c
View File

@ -2523,8 +2523,10 @@ static int qc_parse_pkt_frms(struct quic_rx_packet *pkt, struct ssl_sock_ctx *ct
case QUIC_FT_MAX_STREAM_DATA:
if (qc->mux_state == QC_MUX_READY) {
struct quic_max_stream_data *data = &frm.max_stream_data;
qcc_recv_max_stream_data(qc->qcc, data->id,
data->max_stream_data);
if (qcc_recv_max_stream_data(qc->qcc, data->id,
data->max_stream_data)) {
goto err;
}
}
break;
case QUIC_FT_MAX_STREAMS_BIDI: