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-rw-r--r--src/quic_retransmit.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/src/quic_retransmit.c b/src/quic_retransmit.c
new file mode 100644
index 0000000..d06293f
--- /dev/null
+++ b/src/quic_retransmit.c
@@ -0,0 +1,252 @@
+#include <import/eb64tree.h>
+
+#include <haproxy/quic_conn.h>
+#include <haproxy/quic_frame.h>
+#include <haproxy/quic_retransmit.h>
+#include <haproxy/quic_trace.h>
+#include <haproxy/quic_tx.h>
+#include <haproxy/trace.h>
+
+#define TRACE_SOURCE &trace_quic
+
+/* Duplicate all frames from <pkt_frm_list> list into <out_frm_list> list
+ * for <qc> QUIC connection.
+ * This is a best effort function which never fails even if no memory could be
+ * allocated to duplicate these frames.
+ */
+static void qc_dup_pkt_frms(struct quic_conn *qc,
+ struct list *pkt_frm_list, struct list *out_frm_list)
+{
+ struct quic_frame *frm, *frmbak;
+ struct list tmp = LIST_HEAD_INIT(tmp);
+
+ TRACE_ENTER(QUIC_EV_CONN_PRSAFRM, qc);
+
+ list_for_each_entry_safe(frm, frmbak, pkt_frm_list, list) {
+ struct quic_frame *dup_frm, *origin;
+
+ if (frm->flags & QUIC_FL_TX_FRAME_ACKED) {
+ TRACE_DEVEL("already acknowledged frame", QUIC_EV_CONN_PRSAFRM, qc, frm);
+ continue;
+ }
+
+ switch (frm->type) {
+ case QUIC_FT_STREAM_8 ... QUIC_FT_STREAM_F:
+ {
+ struct qf_stream *strm_frm = &frm->stream;
+ struct eb64_node *node = NULL;
+ struct qc_stream_desc *stream_desc;
+
+ node = eb64_lookup(&qc->streams_by_id, strm_frm->id);
+ if (!node) {
+ TRACE_DEVEL("ignored frame for a released stream", QUIC_EV_CONN_PRSAFRM, qc, frm);
+ continue;
+ }
+
+ stream_desc = eb64_entry(node, struct qc_stream_desc, by_id);
+ /* Do not resend this frame if in the "already acked range" */
+ if (strm_frm->offset.key + strm_frm->len <= stream_desc->ack_offset) {
+ TRACE_DEVEL("ignored frame in already acked range",
+ QUIC_EV_CONN_PRSAFRM, qc, frm);
+ continue;
+ }
+ else if (strm_frm->offset.key < stream_desc->ack_offset) {
+ uint64_t diff = stream_desc->ack_offset - strm_frm->offset.key;
+
+ qc_stream_frm_mv_fwd(frm, diff);
+ TRACE_DEVEL("updated partially acked frame",
+ QUIC_EV_CONN_PRSAFRM, qc, frm);
+ }
+
+ strm_frm->dup = 1;
+ break;
+ }
+
+ default:
+ break;
+ }
+
+ /* If <frm> is already a copy of another frame, we must take
+ * its original frame as source for the copy.
+ */
+ origin = frm->origin ? frm->origin : frm;
+ dup_frm = qc_frm_dup(origin);
+ if (!dup_frm) {
+ TRACE_ERROR("could not duplicate frame", QUIC_EV_CONN_PRSAFRM, qc, frm);
+ break;
+ }
+
+ TRACE_DEVEL("built probing frame", QUIC_EV_CONN_PRSAFRM, qc, origin);
+ if (origin->pkt) {
+ TRACE_DEVEL("duplicated from packet", QUIC_EV_CONN_PRSAFRM,
+ qc, dup_frm, &origin->pkt->pn_node.key);
+ }
+ else {
+ /* <origin> is a frame which was sent from a packet detected as lost. */
+ TRACE_DEVEL("duplicated from lost packet", QUIC_EV_CONN_PRSAFRM, qc);
+ }
+
+ LIST_APPEND(&tmp, &dup_frm->list);
+ }
+
+ LIST_SPLICE(out_frm_list, &tmp);
+
+ TRACE_LEAVE(QUIC_EV_CONN_PRSAFRM, qc);
+}
+
+/* Boolean function which return 1 if <pkt> TX packet is only made of
+ * already acknowledged frame.
+ */
+static inline int qc_pkt_with_only_acked_frms(struct quic_tx_packet *pkt)
+{
+ struct quic_frame *frm;
+
+ list_for_each_entry(frm, &pkt->frms, list)
+ if (!(frm->flags & QUIC_FL_TX_FRAME_ACKED))
+ return 0;
+
+ return 1;
+}
+
+/* Prepare a fast retransmission from <qel> encryption level */
+void qc_prep_fast_retrans(struct quic_conn *qc,
+ struct quic_pktns *pktns,
+ struct list *frms1, struct list *frms2)
+{
+ struct eb_root *pkts = &pktns->tx.pkts;
+ struct list *frms = frms1;
+ struct eb64_node *node;
+ struct quic_tx_packet *pkt;
+
+ TRACE_ENTER(QUIC_EV_CONN_SPPKTS, qc);
+
+ BUG_ON(frms1 == frms2);
+
+ pkt = NULL;
+ node = eb64_first(pkts);
+ start:
+ while (node) {
+ struct quic_tx_packet *p;
+
+ p = eb64_entry(node, struct quic_tx_packet, pn_node);
+ node = eb64_next(node);
+ /* Skip the empty and coalesced packets */
+ TRACE_PRINTF(TRACE_LEVEL_PROTO, QUIC_EV_CONN_SPPKTS, qc, 0, 0, 0,
+ "--> pn=%llu (%d %d %d)", (ull)p->pn_node.key,
+ LIST_ISEMPTY(&p->frms), !!(p->flags & QUIC_FL_TX_PACKET_COALESCED),
+ qc_pkt_with_only_acked_frms(p));
+ if (!LIST_ISEMPTY(&p->frms) && !qc_pkt_with_only_acked_frms(p)) {
+ pkt = p;
+ break;
+ }
+ }
+
+ if (!pkt)
+ goto leave;
+
+ /* When building a packet from another one, the field which may increase the
+ * packet size is the packet number. And the maximum increase is 4 bytes.
+ */
+ if (!quic_peer_validated_addr(qc) && qc_is_listener(qc) &&
+ pkt->len + 4 > quic_may_send_bytes(qc)) {
+ qc->flags |= QUIC_FL_CONN_ANTI_AMPLIFICATION_REACHED;
+ TRACE_PROTO("anti-amplification limit would be reached", QUIC_EV_CONN_SPPKTS, qc, pkt);
+ goto leave;
+ }
+
+ TRACE_PROTO("duplicating packet", QUIC_EV_CONN_SPPKTS, qc, pkt);
+ qc_dup_pkt_frms(qc, &pkt->frms, frms);
+ if (frms == frms1 && frms2) {
+ frms = frms2;
+ goto start;
+ }
+ leave:
+ TRACE_LEAVE(QUIC_EV_CONN_SPPKTS, qc);
+}
+
+/* Prepare a fast retransmission during a handshake after a client
+ * has resent Initial packets. According to the RFC a server may retransmit
+ * Initial packets send them coalescing with others (Handshake here).
+ * (Listener only function).
+ */
+void qc_prep_hdshk_fast_retrans(struct quic_conn *qc,
+ struct list *ifrms, struct list *hfrms)
+{
+ struct list itmp = LIST_HEAD_INIT(itmp);
+ struct list htmp = LIST_HEAD_INIT(htmp);
+
+ struct quic_enc_level *iqel = qc->iel;
+ struct quic_enc_level *hqel = qc->hel;
+ struct quic_enc_level *qel = iqel;
+ struct eb_root *pkts;
+ struct eb64_node *node;
+ struct quic_tx_packet *pkt;
+ struct list *tmp = &itmp;
+
+ TRACE_ENTER(QUIC_EV_CONN_SPPKTS, qc);
+ start:
+ pkt = NULL;
+ pkts = &qel->pktns->tx.pkts;
+ node = eb64_first(pkts);
+ /* Skip the empty packet (they have already been retransmitted) */
+ while (node) {
+ struct quic_tx_packet *p;
+
+ p = eb64_entry(node, struct quic_tx_packet, pn_node);
+ TRACE_PRINTF(TRACE_LEVEL_PROTO, QUIC_EV_CONN_SPPKTS, qc, 0, 0, 0,
+ "--> pn=%llu (%d %d)", (ull)p->pn_node.key,
+ LIST_ISEMPTY(&p->frms), !!(p->flags & QUIC_FL_TX_PACKET_COALESCED));
+ if (!LIST_ISEMPTY(&p->frms) && !(p->flags & QUIC_FL_TX_PACKET_COALESCED) &&
+ !qc_pkt_with_only_acked_frms(p)) {
+ pkt = p;
+ break;
+ }
+
+ node = eb64_next(node);
+ }
+
+ if (!pkt)
+ goto end;
+
+ /* When building a packet from another one, the field which may increase the
+ * packet size is the packet number. And the maximum increase is 4 bytes.
+ */
+ if (!quic_peer_validated_addr(qc) && qc_is_listener(qc)) {
+ size_t dglen = pkt->len + 4;
+ size_t may_send;
+
+ may_send = quic_may_send_bytes(qc);
+ dglen += pkt->next ? pkt->next->len + 4 : 0;
+ if (dglen > may_send) {
+ qc->flags |= QUIC_FL_CONN_ANTI_AMPLIFICATION_REACHED;
+ TRACE_PROTO("anti-amplification limit would be reached", QUIC_EV_CONN_SPPKTS, qc, pkt);
+ if (pkt->next)
+ TRACE_PROTO("anti-amplification limit would be reached", QUIC_EV_CONN_SPPKTS, qc, pkt->next);
+ if (qel == iqel && may_send >= QUIC_INITIAL_PACKET_MINLEN)
+ TRACE_PROTO("will probe Initial packet number space", QUIC_EV_CONN_SPPKTS, qc);
+ goto end;
+ }
+ }
+
+ qel->pktns->tx.pto_probe += 1;
+
+ /* No risk to loop here, #packet per datagram is bounded */
+ requeue:
+ TRACE_PROTO("duplicating packet", QUIC_EV_CONN_PRSAFRM, qc, NULL, &pkt->pn_node.key);
+ qc_dup_pkt_frms(qc, &pkt->frms, tmp);
+ if (qel == iqel) {
+ if (pkt->next && pkt->next->type == QUIC_PACKET_TYPE_HANDSHAKE) {
+ pkt = pkt->next;
+ tmp = &htmp;
+ hqel->pktns->tx.pto_probe += 1;
+ TRACE_DEVEL("looping for next packet", QUIC_EV_CONN_SPPKTS, qc);
+ goto requeue;
+ }
+ }
+
+ end:
+ LIST_SPLICE(ifrms, &itmp);
+ LIST_SPLICE(hfrms, &htmp);
+
+ TRACE_LEAVE(QUIC_EV_CONN_SPPKTS, qc);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-31 17:59:19 +0000