2 * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #ifndef OSSL_QUIC_TXPIM_H
11 # define OSSL_QUIC_TXPIM_H
13 # include <openssl/ssl.h>
14 # include "internal/quic_types.h"
15 # include "internal/quic_cfq.h"
16 # include "internal/quic_ackm.h"
19 * QUIC Transmitted Packet Information Manager
20 * ===========================================
22 typedef struct quic_txpim_st QUIC_TXPIM;
23 typedef struct quic_fifd_st QUIC_FIFD;
25 typedef struct quic_txpim_pkt_st {
26 /* ACKM-specific data. Caller should fill this. */
27 OSSL_ACKM_TX_PKT ackm_pkt;
29 /* Linked list of CFQ items in this packet. */
30 QUIC_CFQ_ITEM *retx_head;
32 /* Reserved for FIFD use. */
35 /* Regenerate-strategy frames. */
36 unsigned int had_handshake_done_frame : 1;
37 unsigned int had_max_data_frame : 1;
38 unsigned int had_max_streams_bidi_frame : 1;
39 unsigned int had_max_streams_uni_frame : 1;
40 unsigned int had_ack_frame : 1;
42 /* Private data follows. */
45 /* Represents a range of bytes in an application or CRYPTO stream. */
46 typedef struct quic_txpim_chunk_st {
47 /* The stream ID, or UINT64_MAX for the CRYPTO stream. */
50 * The inclusive range of bytes in the stream. Exceptionally, if end <
51 * start, designates a frame of zero length (used for FIN-only frames). In
52 * this case end is the number of the final byte (i.e., one less than the
53 * final size of the stream).
57 * Whether a FIN was sent for this stream in the packet. Not valid for
60 unsigned int has_fin : 1;
62 * If set, a STOP_SENDING frame was sent for this stream ID. (If no data was
63 * sent for the stream, set end < start.)
65 unsigned int has_stop_sending : 1;
67 * If set, a RESET_STREAM frame was sent for this stream ID. (If no data was
68 * sent for the stream, set end < start.)
70 unsigned int has_reset_stream : 1;
73 QUIC_TXPIM *ossl_quic_txpim_new(void);
76 * Frees the TXPIM. All QUIC_TXPIM_PKTs which have been handed out by the TXPIM
77 * must be released via a call to ossl_quic_txpim_pkt_release() before calling
80 void ossl_quic_txpim_free(QUIC_TXPIM *txpim);
83 * Allocates a new QUIC_TXPIM_PKT structure from the pool. Returns NULL on
84 * failure. The returned structure is cleared of all data and is in a fresh
87 QUIC_TXPIM_PKT *ossl_quic_txpim_pkt_alloc(QUIC_TXPIM *txpim);
90 * Releases the TXPIM packet, returning it to the pool.
92 void ossl_quic_txpim_pkt_release(QUIC_TXPIM *txpim, QUIC_TXPIM_PKT *fpkt);
94 /* Clears the chunk list of the packet, removing all entries. */
95 void ossl_quic_txpim_pkt_clear_chunks(QUIC_TXPIM_PKT *fpkt);
97 /* Appends a chunk to the packet. The structure is copied. */
98 int ossl_quic_txpim_pkt_append_chunk(QUIC_TXPIM_PKT *fpkt,
99 const QUIC_TXPIM_CHUNK *chunk);
101 /* Adds a CFQ item to the packet by prepending it to the retx_head list. */
102 void ossl_quic_txpim_pkt_add_cfq_item(QUIC_TXPIM_PKT *fpkt,
103 QUIC_CFQ_ITEM *item);
106 * Returns a pointer to an array of stream chunk information structures for the
107 * given packet. The caller must call ossl_quic_txpim_pkt_get_num_chunks() to
108 * determine the length of this array. The returned pointer is invalidated
109 * if the chunk list is mutated, for example via a call to
110 * ossl_quic_txpim_pkt_append_chunk() or ossl_quic_txpim_pkt_clear_chunks().
112 * The chunks are sorted by (stream_id, start) in ascending order.
114 const QUIC_TXPIM_CHUNK *ossl_quic_txpim_pkt_get_chunks(const QUIC_TXPIM_PKT *fpkt);
117 * Returns the number of entries in the array returned by
118 * ossl_quic_txpim_pkt_get_chunks().
120 size_t ossl_quic_txpim_pkt_get_num_chunks(const QUIC_TXPIM_PKT *fpkt);
123 * Returns the number of QUIC_TXPIM_PKTs allocated by the given TXPIM that have
124 * yet to be returned to the TXPIM.
126 size_t ossl_quic_txpim_get_in_use(const QUIC_TXPIM *txpim);