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openssl/ssl/quic/quic_stream_map.c
Hugo Landau 9d6bd3d30f QUIC APL: Implement backpressure on stream creation 
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21811)
2023-08-25 15:10:43 +02:00

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/*
* Copyright 2022 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
*/
#include "internal/quic_stream_map.h"
#include "internal/nelem.h"
/*
* QUIC Stream Map
* ===============
*/
DEFINE_LHASH_OF_EX(QUIC_STREAM);
static void shutdown_flush_done(QUIC_STREAM_MAP *qsm, QUIC_STREAM *qs);
/* Circular list management. */
static void list_insert_tail(QUIC_STREAM_LIST_NODE *l,
QUIC_STREAM_LIST_NODE *n)
{
/* Must not be in list. */
assert(n->prev == NULL && n->next == NULL
&& l->prev != NULL && l->next != NULL);
n->prev = l->prev;
n->prev->next = n;
l->prev = n;
n->next = l;
}
static void list_remove(QUIC_STREAM_LIST_NODE *l,
QUIC_STREAM_LIST_NODE *n)
{
assert(n->prev != NULL && n->next != NULL
&& n->prev != n && n->next != n);
n->prev->next = n->next;
n->next->prev = n->prev;
n->next = n->prev = NULL;
}
static QUIC_STREAM *list_next(QUIC_STREAM_LIST_NODE *l, QUIC_STREAM_LIST_NODE *n,
size_t off)
{
assert(n->prev != NULL && n->next != NULL
&& (n == l || (n->prev != n && n->next != n))
&& l->prev != NULL && l->next != NULL);
n = n->next;
if (n == l)
n = n->next;
if (n == l)
return NULL;
assert(n != NULL);
return (QUIC_STREAM *)(((char *)n) - off);
}
#define active_next(l, s) list_next((l), &(s)->active_node, \
offsetof(QUIC_STREAM, active_node))
#define accept_next(l, s) list_next((l), &(s)->accept_node, \
offsetof(QUIC_STREAM, accept_node))
#define ready_for_gc_next(l, s) list_next((l), &(s)->ready_for_gc_node, \
offsetof(QUIC_STREAM, ready_for_gc_node))
#define accept_head(l) list_next((l), (l), \
offsetof(QUIC_STREAM, accept_node))
#define ready_for_gc_head(l) list_next((l), (l), \
offsetof(QUIC_STREAM, ready_for_gc_node))
static unsigned long hash_stream(const QUIC_STREAM *s)
{
return (unsigned long)s->id;
}
static int cmp_stream(const QUIC_STREAM *a, const QUIC_STREAM *b)
{
if (a->id < b->id)
return -1;
if (a->id > b->id)
return 1;
return 0;
}
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)
{
qsm->map = lh_QUIC_STREAM_new(hash_stream, cmp_stream);
qsm->active_list.prev = qsm->active_list.next = &qsm->active_list;
qsm->accept_list.prev = qsm->accept_list.next = &qsm->accept_list;
qsm->ready_for_gc_list.prev = qsm->ready_for_gc_list.next
= &qsm->ready_for_gc_list;
qsm->rr_stepping = 1;
qsm->rr_counter = 0;
qsm->rr_cur = NULL;
qsm->num_accept = 0;
qsm->num_shutdown_flush = 0;
qsm->get_stream_limit_cb = get_stream_limit_cb;
qsm->get_stream_limit_cb_arg = get_stream_limit_cb_arg;
qsm->max_streams_bidi_rxfc = max_streams_bidi_rxfc;
qsm->max_streams_uni_rxfc = max_streams_uni_rxfc;
qsm->is_server = is_server;
return 1;
}
static void release_each(QUIC_STREAM *stream, void *arg)
{
QUIC_STREAM_MAP *qsm = arg;
ossl_quic_stream_map_release(qsm, stream);
}
void ossl_quic_stream_map_cleanup(QUIC_STREAM_MAP *qsm)
{
ossl_quic_stream_map_visit(qsm, release_each, qsm);
lh_QUIC_STREAM_free(qsm->map);
qsm->map = NULL;
}
void ossl_quic_stream_map_visit(QUIC_STREAM_MAP *qsm,
void (*visit_cb)(QUIC_STREAM *stream, void *arg),
void *visit_cb_arg)
{
lh_QUIC_STREAM_doall_arg(qsm->map, visit_cb, visit_cb_arg);
}
QUIC_STREAM *ossl_quic_stream_map_alloc(QUIC_STREAM_MAP *qsm,
uint64_t stream_id,
int type)
{
QUIC_STREAM *s;
QUIC_STREAM key;
key.id = stream_id;
s = lh_QUIC_STREAM_retrieve(qsm->map, &key);
if (s != NULL)
return NULL;
s = OPENSSL_zalloc(sizeof(*s));
if (s == NULL)
return NULL;
s->id = stream_id;
s->type = type;
s->as_server = qsm->is_server;
s->send_state = (ossl_quic_stream_is_local_init(s)
|| ossl_quic_stream_is_bidi(s))
? QUIC_SSTREAM_STATE_READY
: QUIC_SSTREAM_STATE_NONE;
s->recv_state = (!ossl_quic_stream_is_local_init(s)
|| ossl_quic_stream_is_bidi(s))
? QUIC_RSTREAM_STATE_RECV
: QUIC_RSTREAM_STATE_NONE;
s->send_final_size = UINT64_MAX;
lh_QUIC_STREAM_insert(qsm->map, s);
return s;
}
void ossl_quic_stream_map_release(QUIC_STREAM_MAP *qsm, QUIC_STREAM *stream)
{
if (stream == NULL)
return;
if (stream->active_node.next != NULL)
list_remove(&qsm->active_list, &stream->active_node);
if (stream->accept_node.next != NULL)
list_remove(&qsm->accept_list, &stream->accept_node);
if (stream->ready_for_gc_node.next != NULL)
list_remove(&qsm->ready_for_gc_list, &stream->ready_for_gc_node);
ossl_quic_sstream_free(stream->sstream);
stream->sstream = NULL;
ossl_quic_rstream_free(stream->rstream);
stream->rstream = NULL;
lh_QUIC_STREAM_delete(qsm->map, stream);
OPENSSL_free(stream);
}
QUIC_STREAM *ossl_quic_stream_map_get_by_id(QUIC_STREAM_MAP *qsm,
uint64_t stream_id)
{
QUIC_STREAM key;
key.id = stream_id;
return lh_QUIC_STREAM_retrieve(qsm->map, &key);
}
static void stream_map_mark_active(QUIC_STREAM_MAP *qsm, QUIC_STREAM *s)
{
if (s->active)
return;
list_insert_tail(&qsm->active_list, &s->active_node);
if (qsm->rr_cur == NULL)
qsm->rr_cur = s;
s->active = 1;
}
static void stream_map_mark_inactive(QUIC_STREAM_MAP *qsm, QUIC_STREAM *s)
{
if (!s->active)
return;
if (qsm->rr_cur == s)
qsm->rr_cur = active_next(&qsm->active_list, s);
if (qsm->rr_cur == s)
qsm->rr_cur = NULL;
list_remove(&qsm->active_list, &s->active_node);
s->active = 0;
}
void ossl_quic_stream_map_set_rr_stepping(QUIC_STREAM_MAP *qsm, size_t stepping)
{
qsm->rr_stepping = stepping;
qsm->rr_counter = 0;
}
static int stream_has_data_to_send(QUIC_STREAM *s)
{
OSSL_QUIC_FRAME_STREAM shdr;
OSSL_QTX_IOVEC iov[2];
size_t num_iov;
uint64_t fc_credit, fc_swm, fc_limit;
switch (s->send_state) {
case QUIC_SSTREAM_STATE_READY:
case QUIC_SSTREAM_STATE_SEND:
case QUIC_SSTREAM_STATE_DATA_SENT:
/*
* We can still have data to send in DATA_SENT due to retransmissions,
* etc.
*/
break;
default:
return 0; /* Nothing to send. */
}
/*
* We cannot determine if we have data to send simply by checking if
* ossl_quic_txfc_get_credit() is zero, because we may also have older
* stream data we need to retransmit. The SSTREAM returns older data first,
* so we do a simple comparison of the next chunk the SSTREAM wants to send
* against the TXFC CWM.
*/
num_iov = OSSL_NELEM(iov);
if (!ossl_quic_sstream_get_stream_frame(s->sstream, 0, &shdr, iov,
&num_iov))
return 0;
fc_credit = ossl_quic_txfc_get_credit(&s->txfc);
fc_swm = ossl_quic_txfc_get_swm(&s->txfc);
fc_limit = fc_swm + fc_credit;
return (shdr.is_fin && shdr.len == 0) || shdr.offset < fc_limit;
}
static ossl_unused int qsm_send_part_permits_gc(const QUIC_STREAM *qs)
{
switch (qs->send_state) {
case QUIC_SSTREAM_STATE_NONE:
case QUIC_SSTREAM_STATE_DATA_RECVD:
case QUIC_SSTREAM_STATE_RESET_RECVD:
return 1;
default:
return 0;
}
}
static int qsm_ready_for_gc(QUIC_STREAM_MAP *qsm, QUIC_STREAM *qs)
{
int recv_stream_fully_drained = 0; /* TODO(QUIC FUTURE): Optimisation */
/*
* If sstream has no FIN, we auto-reset it at marked-for-deletion time, so
* we don't need to worry about that here.
*/
assert(!qs->deleted
|| !ossl_quic_stream_has_send(qs)
|| ossl_quic_stream_send_is_reset(qs)
|| ossl_quic_stream_send_get_final_size(qs, NULL));
return
qs->deleted
&& (!ossl_quic_stream_has_recv(qs)
|| recv_stream_fully_drained
|| qs->acked_stop_sending)
&& (!ossl_quic_stream_has_send(qs)
|| qs->send_state == QUIC_SSTREAM_STATE_DATA_RECVD
|| qs->send_state == QUIC_SSTREAM_STATE_RESET_RECVD);
}
int ossl_quic_stream_map_is_local_allowed_by_stream_limit(QUIC_STREAM_MAP *qsm,
uint64_t stream_ordinal,
int is_uni)
{
uint64_t stream_limit;
if (qsm->get_stream_limit_cb == NULL)
return 1;
stream_limit = qsm->get_stream_limit_cb(is_uni, qsm->get_stream_limit_cb_arg);
return stream_ordinal < stream_limit;
}
void ossl_quic_stream_map_update_state(QUIC_STREAM_MAP *qsm, QUIC_STREAM *s)
{
int should_be_active, allowed_by_stream_limit = 1;
if (ossl_quic_stream_is_server_init(s) == qsm->is_server) {
int is_uni = !ossl_quic_stream_is_bidi(s);
uint64_t stream_ordinal = s->id >> 2;
allowed_by_stream_limit
= ossl_quic_stream_map_is_local_allowed_by_stream_limit(qsm,
stream_ordinal,
is_uni);
}
if (s->send_state == QUIC_SSTREAM_STATE_DATA_SENT
&& ossl_quic_sstream_is_totally_acked(s->sstream))
ossl_quic_stream_map_notify_totally_acked(qsm, s);
else if (s->shutdown_flush
&& s->send_state == QUIC_SSTREAM_STATE_SEND
&& ossl_quic_sstream_is_totally_acked(s->sstream))
shutdown_flush_done(qsm, s);
if (!s->ready_for_gc) {
s->ready_for_gc = qsm_ready_for_gc(qsm, s);
if (s->ready_for_gc)
list_insert_tail(&qsm->ready_for_gc_list, &s->ready_for_gc_node);
}
should_be_active
= allowed_by_stream_limit
&& !s->ready_for_gc
&& ((ossl_quic_stream_has_recv(s)
&& !ossl_quic_stream_recv_is_reset(s)
&& (s->recv_state == QUIC_RSTREAM_STATE_RECV
&& (s->want_max_stream_data
|| ossl_quic_rxfc_has_cwm_changed(&s->rxfc, 0))))
|| s->want_stop_sending
|| s->want_reset_stream
|| (!s->peer_stop_sending && stream_has_data_to_send(s)));
if (should_be_active)
stream_map_mark_active(qsm, s);
else
stream_map_mark_inactive(qsm, s);
}
/*
* Stream Send Part State Management
* =================================
*/
int ossl_quic_stream_map_ensure_send_part_id(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->send_state) {
case QUIC_SSTREAM_STATE_NONE:
/* Stream without send part - caller error. */
return 0;
case QUIC_SSTREAM_STATE_READY:
/*
* We always allocate a stream ID upfront, so we don't need to do it
* here.
*/
qs->send_state = QUIC_SSTREAM_STATE_SEND;
return 1;
default:
/* Nothing to do. */
return 1;
}
}
int ossl_quic_stream_map_notify_all_data_sent(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->send_state) {
default:
/* Wrong state - caller error. */
case QUIC_SSTREAM_STATE_NONE:
/* Stream without send part - caller error. */
return 0;
case QUIC_SSTREAM_STATE_SEND:
if (!ossl_quic_sstream_get_final_size(qs->sstream, &qs->send_final_size))
return 0;
qs->send_state = QUIC_SSTREAM_STATE_DATA_SENT;
return 1;
}
}
static void shutdown_flush_done(QUIC_STREAM_MAP *qsm, QUIC_STREAM *qs)
{
if (!qs->shutdown_flush)
return;
assert(qsm->num_shutdown_flush > 0);
qs->shutdown_flush = 0;
--qsm->num_shutdown_flush;
}
int ossl_quic_stream_map_notify_totally_acked(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->send_state) {
default:
/* Wrong state - caller error. */
case QUIC_SSTREAM_STATE_NONE:
/* Stream without send part - caller error. */
return 0;
case QUIC_SSTREAM_STATE_DATA_SENT:
qs->send_state = QUIC_SSTREAM_STATE_DATA_RECVD;
/* We no longer need a QUIC_SSTREAM in this state. */
ossl_quic_sstream_free(qs->sstream);
qs->sstream = NULL;
shutdown_flush_done(qsm, qs);
return 1;
}
}
int ossl_quic_stream_map_reset_stream_send_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t aec)
{
switch (qs->send_state) {
default:
case QUIC_SSTREAM_STATE_NONE:
/*
* RESET_STREAM pertains to sending part only, so we cannot reset a
* receive-only stream.
*/
case QUIC_SSTREAM_STATE_DATA_RECVD:
/*
* RFC 9000 s. 3.3: A sender MUST NOT [...] send RESET_STREAM from a
* terminal state. If the stream has already finished normally and the
* peer has acknowledged this, we cannot reset it.
*/
return 0;
case QUIC_SSTREAM_STATE_READY:
if (!ossl_quic_stream_map_ensure_send_part_id(qsm, qs))
return 0;
/* FALLTHROUGH */
case QUIC_SSTREAM_STATE_SEND:
/*
* If we already have a final size (e.g. because we are coming from
* DATA_SENT), we have to be consistent with that, so don't change it.
* If we don't already have a final size, determine a final size value.
* This is the value which we will end up using for a RESET_STREAM frame
* for flow control purposes. We could send the stream size (total
* number of bytes appended to QUIC_SSTREAM by the application), but it
* is in our interest to exclude any bytes we have not actually
* transmitted yet, to avoid unnecessarily consuming flow control
* credit. We can get this from the TXFC.
*/
qs->send_final_size = ossl_quic_txfc_get_swm(&qs->txfc);
/* FALLTHROUGH */
case QUIC_SSTREAM_STATE_DATA_SENT:
qs->reset_stream_aec = aec;
qs->want_reset_stream = 1;
qs->send_state = QUIC_SSTREAM_STATE_RESET_SENT;
ossl_quic_sstream_free(qs->sstream);
qs->sstream = NULL;
shutdown_flush_done(qsm, qs);
ossl_quic_stream_map_update_state(qsm, qs);
return 1;
case QUIC_SSTREAM_STATE_RESET_SENT:
case QUIC_SSTREAM_STATE_RESET_RECVD:
/*
* Idempotent - no-op. In any case, do not send RESET_STREAM again - as
* mentioned, we must not send it from a terminal state.
*/
return 1;
}
}
int ossl_quic_stream_map_notify_reset_stream_acked(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->send_state) {
default:
/* Wrong state - caller error. */
case QUIC_SSTREAM_STATE_NONE:
/* Stream without send part - caller error. */
return 0;
case QUIC_SSTREAM_STATE_RESET_SENT:
qs->send_state = QUIC_SSTREAM_STATE_RESET_RECVD;
return 1;
case QUIC_SSTREAM_STATE_RESET_RECVD:
/* Already in the correct state. */
return 1;
}
}
/*
* Stream Receive Part State Management
* ====================================
*/
int ossl_quic_stream_map_notify_size_known_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t final_size)
{
switch (qs->recv_state) {
default:
/* Wrong state - caller error. */
case QUIC_RSTREAM_STATE_NONE:
/* Stream without receive part - caller error. */
return 0;
case QUIC_RSTREAM_STATE_RECV:
qs->recv_state = QUIC_RSTREAM_STATE_SIZE_KNOWN;
return 1;
}
}
int ossl_quic_stream_map_notify_totally_received(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->recv_state) {
default:
/* Wrong state - caller error. */
case QUIC_RSTREAM_STATE_NONE:
/* Stream without receive part - caller error. */
return 0;
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
qs->recv_state = QUIC_RSTREAM_STATE_DATA_RECVD;
qs->want_stop_sending = 0;
return 1;
}
}
int ossl_quic_stream_map_notify_totally_read(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->recv_state) {
default:
/* Wrong state - caller error. */
case QUIC_RSTREAM_STATE_NONE:
/* Stream without receive part - caller error. */
return 0;
case QUIC_RSTREAM_STATE_DATA_RECVD:
qs->recv_state = QUIC_RSTREAM_STATE_DATA_READ;
/* QUIC_RSTREAM is no longer needed */
ossl_quic_rstream_free(qs->rstream);
qs->rstream = NULL;
return 1;
}
}
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)
{
uint64_t prev_final_size;
switch (qs->recv_state) {
default:
case QUIC_RSTREAM_STATE_NONE:
/* Stream without receive part - caller error. */
return 0;
case QUIC_RSTREAM_STATE_RECV:
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
case QUIC_RSTREAM_STATE_DATA_RECVD:
if (ossl_quic_stream_recv_get_final_size(qs, &prev_final_size)
&& prev_final_size != final_size)
/* Cannot change previous final size. */
return 0;
qs->recv_state = QUIC_RSTREAM_STATE_RESET_RECVD;
qs->peer_reset_stream_aec = app_error_code;
/* RFC 9000 s. 3.3: No point sending STOP_SENDING if already reset. */
qs->want_stop_sending = 0;
/* QUIC_RSTREAM is no longer needed */
ossl_quic_rstream_free(qs->rstream);
qs->rstream = NULL;
ossl_quic_stream_map_update_state(qsm, qs);
return 1;
case QUIC_RSTREAM_STATE_DATA_READ:
/*
* If we already retired the FIN to the application this is moot
* - just ignore.
*/
case QUIC_RSTREAM_STATE_RESET_RECVD:
case QUIC_RSTREAM_STATE_RESET_READ:
/* Could be a reordered/retransmitted frame - just ignore. */
return 1;
}
}
int ossl_quic_stream_map_notify_app_read_reset_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs)
{
switch (qs->recv_state) {
default:
/* Wrong state - caller error. */
case QUIC_RSTREAM_STATE_NONE:
/* Stream without receive part - caller error. */
return 0;
case QUIC_RSTREAM_STATE_RESET_RECVD:
qs->recv_state = QUIC_RSTREAM_STATE_RESET_READ;
return 1;
}
}
int ossl_quic_stream_map_stop_sending_recv_part(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *qs,
uint64_t aec)
{
if (qs->stop_sending)
return 0;
switch (qs->recv_state) {
default:
case QUIC_RSTREAM_STATE_NONE:
/* Send-only stream, so this makes no sense. */
case QUIC_RSTREAM_STATE_DATA_RECVD:
case QUIC_RSTREAM_STATE_DATA_READ:
/*
* Not really any point in STOP_SENDING if we already received all data.
*/
case QUIC_RSTREAM_STATE_RESET_RECVD:
case QUIC_RSTREAM_STATE_RESET_READ:
/*
* RFC 9000 s. 3.5: "STOP_SENDING SHOULD only be sent for a stream that
* has not been reset by the peer."
*
* No point in STOP_SENDING if the peer already reset their send part.
*/
return 0;
case QUIC_RSTREAM_STATE_RECV:
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
/*
* RFC 9000 s. 3.5: "If the stream is in the Recv or Size Known state,
* the transport SHOULD signal this by sending a STOP_SENDING frame to
* prompt closure of the stream in the opposite direction."
*
* Note that it does make sense to send STOP_SENDING for a receive part
* of a stream which has a known size (because we have received a FIN)
* but which still has other (previous) stream data yet to be received.
*/
break;
}
qs->stop_sending = 1;
qs->stop_sending_aec = aec;
return ossl_quic_stream_map_schedule_stop_sending(qsm, qs);
}
/* Called to mark STOP_SENDING for generation, or regeneration after loss. */
int ossl_quic_stream_map_schedule_stop_sending(QUIC_STREAM_MAP *qsm, QUIC_STREAM *qs)
{
if (!qs->stop_sending)
return 0;
/*
* Ignore the call as a no-op if already scheduled, or in a state
* where it makes no sense to send STOP_SENDING.
*/
if (qs->want_stop_sending)
return 1;
switch (qs->recv_state) {
default:
return 1; /* ignore */
case QUIC_RSTREAM_STATE_RECV:
case QUIC_RSTREAM_STATE_SIZE_KNOWN:
/*
* RFC 9000 s. 3.5: "An endpoint is expected to send another
* STOP_SENDING frame if a packet containing a previous STOP_SENDING is
* lost. However, once either all stream data or a RESET_STREAM frame
* has been received for the stream -- that is, the stream is in any
* state other than "Recv" or "Size Known" -- sending a STOP_SENDING
* frame is unnecessary."
*/
break;
}
qs->want_stop_sending = 1;
ossl_quic_stream_map_update_state(qsm, qs);
return 1;
}
QUIC_STREAM *ossl_quic_stream_map_peek_accept_queue(QUIC_STREAM_MAP *qsm)
{
return accept_head(&qsm->accept_list);
}
void ossl_quic_stream_map_push_accept_queue(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *s)
{
list_insert_tail(&qsm->accept_list, &s->accept_node);
++qsm->num_accept;
}
static QUIC_RXFC *qsm_get_max_streams_rxfc(QUIC_STREAM_MAP *qsm, QUIC_STREAM *s)
{
return ossl_quic_stream_is_bidi(s)
? qsm->max_streams_bidi_rxfc
: qsm->max_streams_uni_rxfc;
}
void ossl_quic_stream_map_remove_from_accept_queue(QUIC_STREAM_MAP *qsm,
QUIC_STREAM *s,
OSSL_TIME rtt)
{
QUIC_RXFC *max_streams_rxfc;
list_remove(&qsm->accept_list, &s->accept_node);
--qsm->num_accept;
if ((max_streams_rxfc = qsm_get_max_streams_rxfc(qsm, s)) != NULL)
ossl_quic_rxfc_on_retire(max_streams_rxfc, 1, rtt);
}
size_t ossl_quic_stream_map_get_accept_queue_len(QUIC_STREAM_MAP *qsm)
{
return qsm->num_accept;
}
void ossl_quic_stream_map_gc(QUIC_STREAM_MAP *qsm)
{
QUIC_STREAM *qs, *qs_head, *qsn = NULL;
for (qs = qs_head = ready_for_gc_head(&qsm->ready_for_gc_list);
qs != NULL && qs != qs_head;
qs = qsn)
{
qsn = ready_for_gc_next(&qsm->ready_for_gc_list, qs);
ossl_quic_stream_map_release(qsm, qs);
}
}
static int eligible_for_shutdown_flush(QUIC_STREAM *qs)
{
/*
* We only care about servicing the send part of a stream (if any) during
* shutdown flush. We make sure we flush a stream if it is either
* non-terminated or was terminated normally such as via
* SSL_stream_conclude. A stream which was terminated via a reset is not
* flushed, and we will have thrown away the send buffer in that case
* anyway.
*/
switch (qs->send_state) {
case QUIC_SSTREAM_STATE_SEND:
case QUIC_SSTREAM_STATE_DATA_SENT:
return !ossl_quic_sstream_is_totally_acked(qs->sstream);
default:
return 0;
}
}
static void begin_shutdown_flush_each(QUIC_STREAM *qs, void *arg)
{
QUIC_STREAM_MAP *qsm = arg;
if (!eligible_for_shutdown_flush(qs) || qs->shutdown_flush)
return;
qs->shutdown_flush = 1;
++qsm->num_shutdown_flush;
}
void ossl_quic_stream_map_begin_shutdown_flush(QUIC_STREAM_MAP *qsm)
{
qsm->num_shutdown_flush = 0;
ossl_quic_stream_map_visit(qsm, begin_shutdown_flush_each, qsm);
}
int ossl_quic_stream_map_is_shutdown_flush_finished(QUIC_STREAM_MAP *qsm)
{
return qsm->num_shutdown_flush == 0;
}
/*
* QUIC Stream Iterator
* ====================
*/
void ossl_quic_stream_iter_init(QUIC_STREAM_ITER *it, QUIC_STREAM_MAP *qsm,
int advance_rr)
{
it->qsm = qsm;
it->stream = it->first_stream = qsm->rr_cur;
if (advance_rr && it->stream != NULL
&& ++qsm->rr_counter >= qsm->rr_stepping) {
qsm->rr_counter = 0;
qsm->rr_cur = active_next(&qsm->active_list, qsm->rr_cur);
}
}
void ossl_quic_stream_iter_next(QUIC_STREAM_ITER *it)
{
if (it->stream == NULL)
return;
it->stream = active_next(&it->qsm->active_list, it->stream);
if (it->stream == it->first_stream)
it->stream = NULL;
}
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