MEDIUM: quic-be: qc_send_mux() adaptation for 0-RTT

When entering this function, a selection is done about the encryption level
to be used to send data. For a client, the early data encryption level
is used to send 0-RTT if this encryption level is initialized.

The Initial encryption is also registered to the send list for clients if there
is Initial crypto data to send. This allow Initial and 0-RTT packets to
be coalesced by datagrams.

diff --git a/src/quic_tx.c b/src/quic_tx.c
index 6ee62451bc91989eae060f454807475c869c0c3e..e78df8a0559184b012347d79f8d580aa63a2059a 100644 (file)
--- a/src/quic_tx.c
+++ b/src/quic_tx.c
@@ -516,6 +516,8 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
        struct list send_list = LIST_HEAD_INIT(send_list);
        enum quic_tx_err ret = QUIC_TX_ERR_NONE;
        int max_dgram = 0, sent;
+       struct quic_enc_level *qel = !qc_is_back(qc) ? qc->ael :
+               qc->eel ? qc->eel : qc->ael;
 
        TRACE_ENTER(QUIC_EV_CONN_TXPKT, qc);
 
@@ -525,6 +527,10 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
                return QUIC_TX_ERR_FATAL;
        }
 
+       /* The QUIC client may need to send Initial CRYPTO data before early data. */
+       if (qc_is_back(qc) && qel == qc->eel && qel_need_sending(qc->iel, qc))
+               qel_register_send(&send_list, qc->iel, &qc->iel->pktns->tx.frms);
+
        /* Try to send post handshake frames first unless on 0-RTT. */
        if ((qc->flags & QUIC_FL_CONN_NEED_POST_HANDSHAKE_FRMS) &&
            qc->state >= QUIC_HS_ST_COMPLETE) {
@@ -539,7 +545,7 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
        }
 
        TRACE_STATE("preparing data (from MUX)", QUIC_EV_CONN_TXPKT, qc);
-       qel_register_send(&send_list, qc->ael, frms);
+       qel_register_send(&send_list, qel, frms);
        sent = qc_send(qc, 0, &send_list, max_dgram);
 
        if (pacer && qc->path->cc.algo->check_app_limited)