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openssl/include/internal/quic_stream_map.h

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/*
* Copyright 2022-2024 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_INTERNAL_QUIC_STREAM_MAP_H
# define OSSL_INTERNAL_QUIC_STREAM_MAP_H
# pragma once
# include "internal/e_os.h"
# include "internal/time.h"
# include "internal/common.h"
# include "internal/quic_types.h"
# include "internal/quic_predef.h"
# include "internal/quic_stream.h"
# include "internal/quic_fc.h"
# include <openssl/lhash.h>
# ifndef OPENSSL_NO_QUIC
/*
* QUIC Stream
* ===========
*
* Logical QUIC stream composing all relevant send and receive components.
*/
typedef struct quic_stream_list_node_st QUIC_STREAM_LIST_NODE;
struct quic_stream_list_node_st {
QUIC_STREAM_LIST_NODE *prev, *next;
};
/*
* QUIC Send Stream States
* -----------------------
*
* These correspond to the states defined in RFC 9000 s. 3.1, with the
* exception of the NONE state which represents the absence of a send stream
* part.
*
* Invariants in each state are noted in comments below. In particular, once all
* data has been acknowledged received, or we have reset the stream, we don't
* need to keep the QUIC_SSTREAM and data buffers around. Of course, we also
* don't have a QUIC_SSTREAM on a receive-only stream.
*/
#define QUIC_SSTREAM_STATE_NONE 0 /* --- sstream == NULL */
#define QUIC_SSTREAM_STATE_READY 1 /* \ */
#define QUIC_SSTREAM_STATE_SEND 2 /* |-- sstream != NULL */
#define QUIC_SSTREAM_STATE_DATA_SENT 3 /* / */
#define QUIC_SSTREAM_STATE_DATA_RECVD 4 /* \ */
#define QUIC_SSTREAM_STATE_RESET_SENT 5 /* |-- sstream == NULL */
#define QUIC_SSTREAM_STATE_RESET_RECVD 6 /* / */
/*
* QUIC Receive Stream States
* --------------------------
*
* These correspond to the states defined in RFC 9000 s. 3.2, with the exception
* of the NONE state which represents the absence of a receive stream part.
*
* Invariants in each state are noted in comments below. In particular, once all
* data has been read by the application, we don't need to keep the QUIC_RSTREAM
* and data buffers around. If the receive part is instead reset before it is
* finished, we also don't need to keep the QUIC_RSTREAM around. Finally, we
* don't need a QUIC_RSTREAM on a send-only stream.
*/
#define QUIC_RSTREAM_STATE_NONE 0 /* --- rstream == NULL */
#define QUIC_RSTREAM_STATE_RECV 1 /* \ */
#define QUIC_RSTREAM_STATE_SIZE_KNOWN 2 /* |-- rstream != NULL */
#define QUIC_RSTREAM_STATE_DATA_RECVD 3 /* / */
#define QUIC_RSTREAM_STATE_DATA_READ 4 /* \ */
#define QUIC_RSTREAM_STATE_RESET_RECVD 5 /* |-- rstream == NULL */
#define QUIC_RSTREAM_STATE_RESET_READ 6 /* / */
struct quic_stream_st {
QUIC_STREAM_LIST_NODE active_node; /* for use by QUIC_STREAM_MAP */
QUIC_STREAM_LIST_NODE accept_node; /* accept queue of remotely-created streams */
QUIC_STREAM_LIST_NODE ready_for_gc_node; /* queue of streams now ready for GC */
/* Temporary link used by TXP. */
QUIC_STREAM *txp_next;
/*
* QUIC Stream ID. Do not assume that this encodes a type as this is a
* version-specific property and may change between QUIC versions; instead,
* use the type field.
*/
uint64_t id;
/*
* Application Error Code (AEC) used for STOP_SENDING frame.
* This is only valid if stop_sending is 1.
*/
uint64_t stop_sending_aec;
/*
* Application Error Code (AEC) used for RESET_STREAM frame.
* This is only valid if reset_stream is 1.
*/
uint64_t reset_stream_aec;
/*
* Application Error Code (AEC) for incoming STOP_SENDING frame.
* This is only valid if peer_stop_sending is 1.
*/
uint64_t peer_stop_sending_aec;
/*
* Application Error Code (AEC) for incoming RESET_STREAM frame.
* This is only valid if peer_reset_stream is 1.
*/
uint64_t peer_reset_stream_aec;
/* Temporary value used by TXP. */
uint64_t txp_txfc_new_credit_consumed;
/*
* The final size of the send stream. Although this information can be
* discerned from a QUIC_SSTREAM, it is stored separately as we need to keep
* track of this even if we have thrown away the QUIC_SSTREAM. Use
* ossl_quic_stream_send_get_final_size to determine if this contain a
* valid value or if there is no final size yet for a sending part.
*
* For the receive part, the final size is tracked by the stream-level RXFC;
* use ossl_quic_stream_recv_get_final_size or
* ossl_quic_rxfc_get_final_size.
*/
uint64_t send_final_size;
/*
* Send stream part and receive stream part buffer management objects.
*
* DO NOT test these pointers (sstream, rstream) for NULL. Determine the
* state of the send or receive stream part first using the appropriate
* function; then the invariant of that state guarantees that sstream or
* rstream either is or is not NULL respectively, therefore there is no
* valid use case for testing these pointers for NULL. In particular, a
* stream with a send part can still have sstream as NULL, and a stream with
* a receive part can still have rstream as NULL. QUIC_SSTREAM and
* QUIC_RSTREAM are stream buffer resource management objects which exist
* only when they need to for buffer management purposes. The existence or
* non-existence of a QUIC_SSTREAM or QUIC_RSTREAM object does not
* correspond with whether a stream's respective send or receive part
* logically exists or not.
*/
QUIC_SSTREAM *sstream; /* NULL if RX-only */
QUIC_RSTREAM *rstream; /* NULL if TX only */
/* Stream-level flow control managers. */
QUIC_TXFC txfc; /* NULL if RX-only */
QUIC_RXFC rxfc; /* NULL if TX-only */
unsigned int type : 8; /* QUIC_STREAM_INITIATOR_*, QUIC_STREAM_DIR_* */
unsigned int send_state : 8; /* QUIC_SSTREAM_STATE_* */
unsigned int recv_state : 8; /* QUIC_RSTREAM_STATE_* */
/* 1 iff this QUIC_STREAM is on the active queue (invariant). */
unsigned int active : 1;
/*
* This is a copy of the QUIC connection as_server value, indicating
* whether we are locally operating as a server or not. Having this
* significantly simplifies stream type determination relative to our
* perspective. It never changes after a QUIC_STREAM is created and is the
* same for all QUIC_STREAMS under a QUIC_STREAM_MAP.
*/
unsigned int as_server : 1;
/*
* Has STOP_SENDING been requested (by us)? Note that this is not the same
* as want_stop_sending below, as a STOP_SENDING frame may already have been
* sent and fully acknowledged.
*/
unsigned int stop_sending : 1;
/*
* Has RESET_STREAM been requested (by us)? Works identically to
* STOP_SENDING for transmission purposes.
*/
/* Has our peer sent a STOP_SENDING frame? */
unsigned int peer_stop_sending : 1;
/* Temporary flags used by TXP. */
unsigned int txp_sent_fc : 1;
unsigned int txp_sent_stop_sending : 1;
unsigned int txp_sent_reset_stream : 1;
unsigned int txp_drained : 1;
unsigned int txp_blocked : 1;
/* Frame regeneration flags. */
unsigned int want_max_stream_data : 1; /* used for regen only */
unsigned int want_stop_sending : 1; /* used for gen or regen */
unsigned int want_reset_stream : 1; /* used for gen or regen */
/* Flags set when frames *we* sent were acknowledged. */
unsigned int acked_stop_sending : 1;
/*
* The stream's XSO has been deleted. Pending GC.
*
* Here is how stream deletion works:
*
* - A QUIC_STREAM cannot be deleted until it is neither in the accept
* queue nor has an associated XSO. This condition occurs when and only
* when deleted is true.
*
* - Once this is the case (i.e., no user-facing API object exposing the
* stream), we can delete the stream once we determine that all of our
* protocol obligations requiring us to keep the QUIC_STREAM around have
* been met.
*
* The following frames relate to the streams layer for a specific
* stream:
*
* STREAM
*
* RX Obligations:
* Ignore for a deleted stream.
*
* (This is different from our obligation for a
* locally-initiated stream ID we have not created yet,
* which we must treat as a protocol error. This can be
* distinguished via a simple monotonic counter.)
*
* TX Obligations:
* None, once we've decided to (someday) delete the stream.
*
* STOP_SENDING
*
* We cannot delete the stream until we have finished informing
* the peer that we are not going to be listening to it
* anymore.
*
* RX Obligations:
* When we delete a stream we must have already had a FIN
* or RESET_STREAM we transmitted acknowledged by the peer.
* Thus we can ignore STOP_SENDING frames for deleted
* streams (if they occur, they are probably just
* retransmissions).
*
* TX Obligations:
* _Acknowledged_ receipt of a STOP_SENDING frame by the
* peer (unless the peer's send part has already FIN'd).
*
* RESET_STREAM
*
* We cannot delete the stream until we have finished informing
* the peer that we are not going to be transmitting on it
* anymore.
*
* RX Obligations:
* This indicates the peer is not going to send any more
* data on the stream. We don't need to care about this
* since once a stream is marked for deletion we don't care
* about any data it does send. We can ignore this for
* deleted streams. The important criterion is that the
* peer has been successfully delivered our STOP_SENDING
* frame.
*
* TX Obligations:
* _Acknowledged_ receipt of a RESET_STREAM frame or FIN by
* the peer.
*
* MAX_STREAM_DATA
*
* RX Obligations:
* Ignore. Since we are not going to be sending any more
* data on a stream once it has been marked for deletion,
* we don't need to care about flow control information.
*
* TX Obligations:
* None.
*
* In other words, our protocol obligation is simply:
*
* - either:
* - the peer has acknowledged receipt of a STOP_SENDING frame sent
* by us; -or-
* - we have received a FIN and all preceding segments from the peer
*
* [NOTE: The actual criterion required here is simply 'we have
* received a FIN from the peer'. However, due to reordering and
* retransmissions we might subsequently receive non-FIN segments
* out of order. The FIN means we know the peer will stop
* transmitting on the stream at *some* point, but by sending
* STOP_SENDING we can avoid these needless retransmissions we
* will just ignore anyway. In actuality we could just handle all
* cases by sending a STOP_SENDING. The strategy we choose is to
* only avoid sending a STOP_SENDING and rely on a received FIN
* when we have received all preceding data, as this makes it
* reasonably certain no benefit would be gained by sending
* STOP_SENDING.]
*
* TODO(QUIC FUTURE): Implement the latter case (currently we
just always do STOP_SENDING).
*
* and;
*
* - we have drained our send stream (for a finished send stream)
* and got acknowledgement all parts of it including the FIN, or
* sent a RESET_STREAM frame and got acknowledgement of that frame.
*
* Once these conditions are met, we can GC the QUIC_STREAM.
*
*/
unsigned int deleted : 1;
/* Set to 1 once the above conditions are actually met. */
unsigned int ready_for_gc : 1;
/* Set to 1 if this is currently counted in the shutdown flush stream count. */
unsigned int shutdown_flush : 1;
};
#define QUIC_STREAM_INITIATOR_CLIENT 0
#define QUIC_STREAM_INITIATOR_SERVER 1
#define QUIC_STREAM_INITIATOR_MASK 1
#define QUIC_STREAM_DIR_BIDI 0
#define QUIC_STREAM_DIR_UNI 2
#define QUIC_STREAM_DIR_MASK 2
void ossl_quic_stream_check(const QUIC_STREAM *s);
/*
* Returns 1 if the QUIC_STREAM was initiated by the endpoint with the server
* role.
*/
static ossl_inline ossl_unused int ossl_quic_stream_is_server_init(const QUIC_STREAM *s)
{
return (s->type & QUIC_STREAM_INITIATOR_MASK) == QUIC_STREAM_INITIATOR_SERVER;
}
/*
* Returns 1 if the QUIC_STREAM is bidirectional and 0 if it is unidirectional.
*/
static ossl_inline ossl_unused int ossl_quic_stream_is_bidi(const QUIC_STREAM *s)
{
return (s->type & QUIC_STREAM_DIR_MASK) == QUIC_STREAM_DIR_BIDI;
}
/* Returns 1 if the QUIC_STREAM was locally initiated. */
static ossl_inline ossl_unused int ossl_quic_stream_is_local_init(const QUIC_STREAM *s)
{
return ossl_quic_stream_is_server_init(s) == s->as_server;
}
/*
* Returns 1 if the QUIC_STREAM has a sending part, based on its stream type.
*
* Do NOT use (s->sstream != NULL) to test this; use this function. Note that
* even if this function returns 1, s->sstream might be NULL if the QUIC_SSTREAM
* has been deemed no longer needed, for example due to a RESET_STREAM.
*/
static ossl_inline ossl_unused int ossl_quic_stream_has_send(const QUIC_STREAM *s)
{
return s->send_state != QUIC_SSTREAM_STATE_NONE;
}
/*
* Returns 1 if the QUIC_STREAM has a receiving part, based on its stream type.
*
* Do NOT use (s->rstream != NULL) to test this; use this function. Note that
* even if this function returns 1, s->rstream might be NULL if the QUIC_RSTREAM
* has been deemed no longer needed, for example if the receive stream is
* completely finished with.
*/
static ossl_inline ossl_unused int ossl_quic_stream_has_recv(const QUIC_STREAM *s)
{
return s->recv_state != QUIC_RSTREAM_STATE_NONE;
}
/*
* Returns 1 if the QUIC_STREAM has a QUIC_SSTREAM send buffer associated with
* it. If this returns 1, s->sstream is guaranteed to be non-NULL. The converse
* is not necessarily true; erasure of a send stream buffer which is no longer
* required is an optimisation which the QSM may, but is not obliged, to
* perform.
*
* This call should be used where it is desired to do something with the send
* stream buffer but there is no more specific send state restriction which is
* applicable.
*
* Note: This does NOT indicate whether it is suitable to allow an application
* to append to the buffer. DATA_SENT indicates all data (including FIN) has
* been *sent*; the absence of DATA_SENT does not mean a FIN has not been queued
* (meaning no more application data can be appended). This is enforced by
* QUIC_SSTREAM.
*/
static ossl_inline ossl_unused int ossl_quic_stream_has_send_buffer(const QUIC_STREAM *s)
{
switch (s->send_state) {
case QUIC_SSTREAM_STATE_READY:
case QUIC_SSTREAM_STATE_SEND:
case QUIC_SSTREAM_STATE_DATA_SENT:
return 1;
default:
return 0;
}
}
/*
* Returns 1 if the QUIC_STREAM has a sending part which is in one of the reset
* states.
*/
static ossl_inline ossl_unused int ossl_quic_stream_send_is_reset(const QUIC_STREAM *s)
{
return s->send_state == QUIC_SSTREAM_STATE_RESET_SENT
|| s->send_state == QUIC_SSTREAM_STATE_RESET_RECVD;
}
/*
* Returns 1 if the QUIC_STREAM has a QUIC_RSTREAM receive buffer associated
* with it. If this returns 1, s->rstream is guaranteed to be non-NULL. The
* converse is not necessarily true; erasure of a receive stream buffer which is
* no longer required is an optimisation which the QSM may, but is not obliged,
* to perform.
*
* This call should be used where it is desired to do something with the receive
* stream buffer but there is no more specific receive state restriction which is
* applicable.
*/
static ossl_inline ossl_unused int ossl_quic_stream_has_recv_buffer(const QUIC_STREAM *s)
{
switch (s->recv_state) {
case QUIC_RSTREAM_STATE_RECV:
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
case QUIC_RSTREAM_STATE_DATA_RECVD:
return 1;
default:
return 0;
}
}
/*
* Returns 1 if the QUIC_STREAM has a receiving part which is in one of the
* reset states.
*/
static ossl_inline ossl_unused int ossl_quic_stream_recv_is_reset(const QUIC_STREAM *s)
{
return s->recv_state == QUIC_RSTREAM_STATE_RESET_RECVD
|| s->recv_state == QUIC_RSTREAM_STATE_RESET_READ;
}
/*
* Returns 1 if the stream has a send part and that part has a final size.
*
* If final_size is non-NULL, *final_size is the final size (on success) or an
* undefined value otherwise.
*/
static ossl_inline ossl_unused int ossl_quic_stream_send_get_final_size(const QUIC_STREAM *s,
uint64_t *final_size)
{
switch (s->send_state) {
default:
case QUIC_SSTREAM_STATE_NONE:
return 0;
case QUIC_SSTREAM_STATE_SEND:
/*
* SEND may or may not have had a FIN - even if we have a FIN we do not
* move to DATA_SENT until we have actually sent all the data. So
* ask the QUIC_SSTREAM.
*/
return ossl_quic_sstream_get_final_size(s->sstream, final_size);
case QUIC_SSTREAM_STATE_DATA_SENT:
case QUIC_SSTREAM_STATE_DATA_RECVD:
case QUIC_SSTREAM_STATE_RESET_SENT:
case QUIC_SSTREAM_STATE_RESET_RECVD:
if (final_size != NULL)
*final_size = s->send_final_size;
return 1;
}
}
/*
* Returns 1 if the stream has a receive part and that part has a final size.
*
* If final_size is non-NULL, *final_size is the final size (on success) or an
* undefined value otherwise.
*/
static ossl_inline ossl_unused int ossl_quic_stream_recv_get_final_size(const QUIC_STREAM *s,
uint64_t *final_size)
{
switch (s->recv_state) {
default:
case QUIC_RSTREAM_STATE_NONE:
case QUIC_RSTREAM_STATE_RECV:
return 0;
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
case QUIC_RSTREAM_STATE_DATA_RECVD:
case QUIC_RSTREAM_STATE_DATA_READ:
case QUIC_RSTREAM_STATE_RESET_RECVD:
case QUIC_RSTREAM_STATE_RESET_READ:
if (!ossl_assert(ossl_quic_rxfc_get_final_size(&s->rxfc, final_size)))
return 0;
return 1;
}
}
/*
* Determines the number of bytes available still to be read, and (if
* include_fin is 1) whether a FIN or reset has yet to be read.
*/
static ossl_inline ossl_unused int ossl_quic_stream_recv_pending(const QUIC_STREAM *s,
int include_fin)
{
size_t avail;
int fin = 0;
switch (s->recv_state) {
default:
case QUIC_RSTREAM_STATE_NONE:
return 0;
case QUIC_RSTREAM_STATE_RECV:
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
case QUIC_RSTREAM_STATE_DATA_RECVD:
if (!ossl_quic_rstream_available(s->rstream, &avail, &fin))
avail = 0;
if (avail == 0 && include_fin && fin)
avail = 1;
return avail;
case QUIC_RSTREAM_STATE_RESET_RECVD:
return include_fin;
case QUIC_RSTREAM_STATE_DATA_READ:
case QUIC_RSTREAM_STATE_RESET_READ:
return 0;
}
}
/*
* QUIC Stream Map
* ===============
*
* The QUIC stream map:
*
* - maps stream IDs to QUIC_STREAM objects;
* - tracks which streams are 'active' (currently have data for transmission);
* - allows iteration over the active streams only.
*
*/
struct quic_stream_map_st {
LHASH_OF(QUIC_STREAM) *map;
QUIC_STREAM_LIST_NODE active_list;
QUIC_STREAM_LIST_NODE accept_list;
QUIC_STREAM_LIST_NODE ready_for_gc_list;
size_t rr_stepping, rr_counter;
size_t num_accept_bidi, num_accept_uni, num_shutdown_flush;
QUIC_STREAM *rr_cur;
uint64_t (*get_stream_limit_cb)(int uni, void *arg);
void *get_stream_limit_cb_arg;
QUIC_RXFC *max_streams_bidi_rxfc;
QUIC_RXFC *max_streams_uni_rxfc;
int is_server;
};
/*
* get_stream_limit is a callback which is called to retrieve the current stream
* limit for streams created by us. This mechanism is not used for
* peer-initiated streams. If a stream's stream ID is x, a stream is allowed if
* (x >> 2) < returned limit value; i.e., the returned value is exclusive.
*
* If uni is 1, get the limit for locally-initiated unidirectional streams, else
* get the limit for locally-initiated bidirectional streams.
*
* If the callback is NULL, stream limiting is not applied.
* Stream limiting is used to determine if frames can currently be produced for
* a stream.
*/
int ossl_quic_stream_map_init(QUIC_STREAM_MAP *qsm,
uint64_t (*get_stream_limit_cb)(int uni, void *arg),
void *get_stream_limit_cb_arg,
QUIC_RXFC *max_streams_bidi_rxfc,
QUIC_RXFC *max_streams_uni_rxfc,
int is_server);
/*
* Any streams still in the map will be released as though
* ossl_quic_stream_map_release was called on them.
*/
void ossl_quic_stream_map_cleanup(QUIC_STREAM_MAP *qsm);
/*
* Allocate a new stream. type is a combination of one QUIC_STREAM_INITIATOR_*
* value and one QUIC_STREAM_DIR_* value. Note that clients can e.g. allocate
* server-initiated streams as they will need to allocate a QUIC_STREAM
* structure to track any stream created by the server, etc.
*
* stream_id must be a valid value. Returns NULL if a stream already exists
* with the given ID.
*/
QUIC_STREAM *ossl_quic_stream_map_alloc(QUIC_STREAM_MAP *qsm,
uint64_t stream_id,
int type);
/*
* Releases a stream object. Note that this must only be done once the teardown
* process is entirely complete and the object will never be referenced again.
*/
void ossl_quic_stream_map_release(QUIC_STREAM_MAP *qsm, QUIC_STREAM *stream);
/*
* Calls visit_cb() for each stream in the map. visit_cb_arg is an opaque
* argument which is passed through.
*/
void ossl_quic_stream_map_visit(QUIC_STREAM_MAP *qsm,
void (*visit_cb)(QUIC_STREAM *stream, void *arg),
void *visit_cb_arg);
/*
* Retrieves a stream by stream ID. Returns NULL if it does not exist.
*/
QUIC_STREAM *ossl_quic_stream_map_get_by_id(QUIC_STREAM_MAP *qsm,
uint64_t stream_id);
/*
* Marks the given stream as active or inactive based on its state. Idempotent.
*
* When a stream is marked active, it becomes available in the iteration list,
* and when a stream is marked inactive, it no longer appears in the iteration
* list.
*
* Calling this function invalidates any iterator currently pointing at the
* given stream object, but iterators not currently pointing at the given stream
* object are not invalidated.
*/
void ossl_quic_stream_map_update_state(QUIC_STREAM_MAP *qsm, QUIC_STREAM *s);
/*
* Sets the RR stepping value, n. The RR rotation will be advanced every n
* packets. The default value is 1.
*/
void ossl_quic_stream_map_set_rr_stepping(QUIC_STREAM_MAP *qsm, size_t stepping);
/*
* Returns 1 if the stream ordinal given is allowed by the current stream count
* flow control limit, assuming a locally initiated stream of a type described
* by is_uni.
*
* Note that stream_ordinal is a stream ordinal, not a stream ID.
*/
int ossl_quic_stream_map_is_local_allowed_by_stream_limit(QUIC_STREAM_MAP *qsm,
uint64_t stream_ordinal,
int is_uni);
/*
* Stream Send Part
* ================
*/
/*
* Ensures that the sending part has transitioned out of the READY state (i.e.,
* to SEND, or a subsequent state). This function is named as it is because,
* while on paper the distinction between READY and SEND is whether we have
* started transmitting application data, in practice the meaningful distinction
* between the two states is whether we have allocated a stream ID to the stream
* or not. QUIC permits us to defer stream ID allocation until first STREAM (or
* STREAM_DATA_BLOCKED) frame transmission for locally-initiated streams.
*
* Our implementation does not currently do this and we allocate stream IDs up
* front, however we may revisit this in the future. Calling this represents a
* demand for a stream ID by the caller and ensures one has been allocated to
* the stream, and causes us to transition to SEND if we are still in the READY
* state.
*
* Returns 0 if there is no send part (caller error) and 1 otherwise.
*/
int ossl_quic_stream_map_ensure_send_part_id(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Transitions from SEND to the DATA_SENT state. Note that this is NOT the same
* as the point in time at which the final size of the stream becomes known
* (i.e., the time at which ossl_quic_sstream_fin()) is called as it occurs when
* we have SENT all data on a given stream send part, not merely buffered it.
* Note that this transition is NOT reversed in the event of some of that data
* being lost.
*
* Returns 1 if the state transition was successfully taken. Returns 0 if there
* is no send part (caller error) or if the state transition cannot be taken
* because the send part is not in the SEND state.
*/
int ossl_quic_stream_map_notify_all_data_sent(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Transitions from the DATA_SENT to DATA_RECVD state; should be called
* when all transmitted stream data is ACKed by the peer.
*
* Returns 1 if the state transition was successfully taken. Returns 0 if there
* is no send part (caller error) or the state transition cannot be taken
* because the send part is not in the DATA_SENT state. Because
* ossl_quic_stream_map_notify_all_data_sent() should always be called prior to
* this function, the send state must already be in DATA_SENT in order for this
* function to succeed.
*/
int ossl_quic_stream_map_notify_totally_acked(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Resets the sending part of a stream. This is a transition from the READY,
* SEND or DATA_SENT send stream states to the RESET_SENT state.
*
* This function returns 1 if the transition is taken (i.e., if the send stream
* part was in one of the states above), or if it is already in the RESET_SENT
* state (idempotent operation), or if it has reached the RESET_RECVD state.
*
* It returns 0 if in the DATA_RECVD state, as a send stream cannot be reset
* in this state. It also returns 0 if there is no send part (caller error).
*/
int ossl_quic_stream_map_reset_stream_send_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t aec);
/*
* Transitions from the RESET_SENT to the RESET_RECVD state. This should be
* called when a sent RESET_STREAM frame has been acknowledged by the peer.
*
* This function returns 1 if the transition is taken (i.e., if the send stream
* part was in one of the states above) or if it is already in the RESET_RECVD
* state (idempotent operation).
*
* It returns 0 if not in the RESET_SENT or RESET_RECVD states, as this function
* should only be called after we have already sent a RESET_STREAM frame and
* entered the RESET_SENT state. It also returns 0 if there is no send part
* (caller error).
*/
int ossl_quic_stream_map_notify_reset_stream_acked(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Stream Receive Part
* ===================
*/
/*
* Transitions from the RECV receive stream state to the SIZE_KNOWN state. This
* should be called once a STREAM frame is received for the stream with the FIN
* bit set. final_size should be the final size of the stream in bytes.
*
* Returns 1 if the transition was taken.
*/
int ossl_quic_stream_map_notify_size_known_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t final_size);
/*
* Transitions from the SIZE_KNOWN receive stream state to the DATA_RECVD state.
* This should be called once all data for a receive stream is received.
*
* Returns 1 if the transition was taken.
*/
int ossl_quic_stream_map_notify_totally_received(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Transitions from the DATA_RECVD receive stream state to the DATA_READ state.
* This should be called once all data for a receive stream is read by the
* application.
*
* Returns 1 if the transition was taken.
*/
int ossl_quic_stream_map_notify_totally_read(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Transitions from the RECV, SIZE_KNOWN or DATA_RECVD receive stream state to
* the RESET_RECVD state. This should be called on RESET_STREAM.
*
* Returns 1 if the transition was taken.
*/
int ossl_quic_stream_map_notify_reset_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t app_error_code,
uint64_t final_size);
/*
* Transitions from the RESET_RECVD receive stream state to the RESET_READ
* receive stream state. This should be called when the application is notified
* of a stream reset.
*/
int ossl_quic_stream_map_notify_app_read_reset_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Marks the receiving part of a stream for STOP_SENDING. This is orthogonal to
* receive stream state as it does not affect it directly.
*
* Returns 1 if the receiving part of a stream was not already marked for
* STOP_SENDING.
* Returns 0 otherwise, which need not be considered an error.
*/
int ossl_quic_stream_map_stop_sending_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t aec);
/*
* Marks the stream as wanting a STOP_SENDING frame transmitted. It is not valid
* to call this if ossl_quic_stream_map_stop_sending_recv_part() has not been
* called. For TXP use.
*/
int ossl_quic_stream_map_schedule_stop_sending(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs);
/*
* Accept Queue Management
* =======================
*/
/*
* Adds a stream to the accept queue.
*/
void ossl_quic_stream_map_push_accept_queue(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *s);
/*
* Returns the next item to be popped from the accept queue, or NULL if it is
* empty.
*/
QUIC_STREAM *ossl_quic_stream_map_peek_accept_queue(QUIC_STREAM_MAP *qsm);
/*
* Removes a stream from the accept queue. rtt is the estimated connection RTT.
* The stream is retired for the purposes of MAX_STREAMS RXFC.
*
* Precondition: s is in the accept queue.
*/
void ossl_quic_stream_map_remove_from_accept_queue(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *s,
OSSL_TIME rtt);
/* Returns the length of the accept queue for the given stream type. */
size_t ossl_quic_stream_map_get_accept_queue_len(QUIC_STREAM_MAP *qsm, int is_uni);
/* Returns the total length of the accept queues for all stream types. */
size_t ossl_quic_stream_map_get_total_accept_queue_len(QUIC_STREAM_MAP *qsm);
/*
* Shutdown Flush and GC
* =====================
*/
/*
* Delete streams ready for GC. Pointers to those QUIC_STREAM objects become
* invalid.
*/
void ossl_quic_stream_map_gc(QUIC_STREAM_MAP *qsm);
/*
* Begins shutdown stream flush triage. Analyses all streams, including deleted
* but not yet GC'd streams, to determine if we should wait for that stream to
* be fully flushed before shutdown. After calling this, call
* ossl_quic_stream_map_is_shutdown_flush_finished() to determine if all
* shutdown flush eligible streams have been flushed.
*/
void ossl_quic_stream_map_begin_shutdown_flush(QUIC_STREAM_MAP *qsm);
/*
* Returns 1 if all shutdown flush eligible streams have finished flushing,
* or if ossl_quic_stream_map_begin_shutdown_flush() has not been called.
*/
int ossl_quic_stream_map_is_shutdown_flush_finished(QUIC_STREAM_MAP *qsm);
/*
* QUIC Stream Iterator
* ====================
*
* Allows the current set of active streams to be walked using a RR-based
* algorithm. Each time ossl_quic_stream_iter_init is called, the RR algorithm
* is stepped. The RR algorithm rotates the iteration order such that the next
* active stream is returned first after n calls to ossl_quic_stream_iter_init,
* where n is the stepping value configured via
* ossl_quic_stream_map_set_rr_stepping.
*
* Suppose there are three active streams and the configured stepping is n:
*
* Iteration 0n: [Stream 1] [Stream 2] [Stream 3]
* Iteration 1n: [Stream 2] [Stream 3] [Stream 1]
* Iteration 2n: [Stream 3] [Stream 1] [Stream 2]
*
*/
typedef struct quic_stream_iter_st {
QUIC_STREAM_MAP *qsm;
QUIC_STREAM *first_stream, *stream;
} QUIC_STREAM_ITER;
/*
* Initialise an iterator, advancing the RR algorithm as necessary (if
* advance_rr is 1). After calling this, it->stream will be the first stream in
* the iteration sequence, or NULL if there are no active streams.
*/
void ossl_quic_stream_iter_init(QUIC_STREAM_ITER *it, QUIC_STREAM_MAP *qsm,
int advance_rr);
/*
* Advances to next stream in iteration sequence. You do not need to call this
* immediately after calling ossl_quic_stream_iter_init(). If the end of the
* list is reached, it->stream will be NULL after calling this.
*/
void ossl_quic_stream_iter_next(QUIC_STREAM_ITER *it);
# endif
#endif
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