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git01.mediatek.com / haproxy / a4fc3a5771d7fd4a3a9a3efe7ee072f101a33a4a / . / src / mux_quic.c
blob: aca72bfa673e7e79b89739a913320e946259707f [file] [log] [blame]
#include <haproxy/mux_quic.h>
#include <import/eb64tree.h>
#include <haproxy/api.h>
#include <haproxy/connection.h>
#include <haproxy/dynbuf.h>
#include <haproxy/h3.h>
#include <haproxy/list.h>
#include <haproxy/ncbuf.h>
#include <haproxy/pool.h>
#include <haproxy/proxy.h>
#include <haproxy/qmux_http.h>
#include <haproxy/qmux_trace.h>
#include <haproxy/quic_conn.h>
#include <haproxy/quic_frame.h>
#include <haproxy/quic_sock.h>
#include <haproxy/quic_stream.h>
#include <haproxy/quic_tp-t.h>
#include <haproxy/ssl_sock-t.h>
#include <haproxy/stconn.h>
#include <haproxy/time.h>
#include <haproxy/trace.h>
DECLARE_POOL(pool_head_qcc, "qcc", sizeof(struct qcc));
DECLARE_POOL(pool_head_qcs, "qcs", sizeof(struct qcs));
static void qcs_free_ncbuf(struct qcs *qcs, struct ncbuf *ncbuf)
{
struct buffer buf;
if (ncb_is_null(ncbuf))
return;
buf = b_make(ncbuf->area, ncbuf->size, 0, 0);
b_free(&buf);
offer_buffers(NULL, 1);
*ncbuf = NCBUF_NULL;
/* Reset DEM_FULL as buffer is released. This ensures mux is not woken
* up from rcv_buf stream callback when demux was previously blocked.
*/
qcs->flags &= ~QC_SF_DEM_FULL;
}
/* Free <qcs> instance. This function is reserved for internal usage : it must
* only be called on qcs alloc error or on connection shutdown. Else
* qcs_destroy must be preferred to handle QUIC flow-control increase.
*/
static void qcs_free(struct qcs *qcs)
{
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_QCS_END, qcc->conn, qcs);
/* Safe to use even if already removed from the list. */
LIST_DEL_INIT(&qcs->el_opening);
LIST_DEL_INIT(&qcs->el_send);
/* Release stream endpoint descriptor. */
BUG_ON(qcs->sd && !se_fl_test(qcs->sd, SE_FL_ORPHAN));
sedesc_free(qcs->sd);
/* Release app-layer context. */
if (qcs->ctx && qcc->app_ops->detach)
qcc->app_ops->detach(qcs);
/* Release qc_stream_desc buffer from quic-conn layer. */
qc_stream_desc_release(qcs->stream, qcs->tx.sent_offset);
/* Free Rx/Tx buffers. */
qcs_free_ncbuf(qcs, &qcs->rx.ncbuf);
b_free(&qcs->tx.buf);
/* Remove qcs from qcc tree. */
eb64_delete(&qcs->by_id);
pool_free(pool_head_qcs, qcs);
TRACE_LEAVE(QMUX_EV_QCS_END, qcc->conn);
}
/* Allocate a new QUIC streams with id <id> and type <type>. */
static struct qcs *qcs_new(struct qcc *qcc, uint64_t id, enum qcs_type type)
{
struct qcs *qcs;
TRACE_ENTER(QMUX_EV_QCS_NEW, qcc->conn);
qcs = pool_alloc(pool_head_qcs);
if (!qcs) {
TRACE_ERROR("alloc failure", QMUX_EV_QCS_NEW, qcc->conn);
return NULL;
}
qcs->stream = NULL;
qcs->qcc = qcc;
qcs->flags = QC_SF_NONE;
qcs->st = QC_SS_IDLE;
qcs->ctx = NULL;
/* App callback attach may register the stream for http-request wait.
* These fields must be initialed before.
*/
LIST_INIT(&qcs->el_opening);
LIST_INIT(&qcs->el_send);
qcs->start = TICK_ETERNITY;
/* store transport layer stream descriptor in qcc tree */
qcs->id = qcs->by_id.key = id;
eb64_insert(&qcc->streams_by_id, &qcs->by_id);
/* If stream is local, use peer remote-limit, or else the opposite. */
if (quic_stream_is_bidi(id)) {
qcs->tx.msd = quic_stream_is_local(qcc, id) ? qcc->rfctl.msd_bidi_r :
qcc->rfctl.msd_bidi_l;
}
else if (quic_stream_is_local(qcc, id)) {
qcs->tx.msd = qcc->rfctl.msd_uni_l;
}
/* Properly set flow-control blocking if initial MSD is nul. */
if (!qcs->tx.msd)
qcs->flags |= QC_SF_BLK_SFCTL;
qcs->rx.ncbuf = NCBUF_NULL;
qcs->rx.app_buf = BUF_NULL;
qcs->rx.offset = qcs->rx.offset_max = 0;
if (quic_stream_is_bidi(id)) {
qcs->rx.msd = quic_stream_is_local(qcc, id) ? qcc->lfctl.msd_bidi_l :
qcc->lfctl.msd_bidi_r;
}
else if (quic_stream_is_remote(qcc, id)) {
qcs->rx.msd = qcc->lfctl.msd_uni_r;
}
qcs->rx.msd_init = qcs->rx.msd;
qcs->tx.buf = BUF_NULL;
qcs->tx.offset = 0;
qcs->tx.sent_offset = 0;
qcs->wait_event.tasklet = NULL;
qcs->wait_event.events = 0;
qcs->subs = NULL;
qcs->err = 0;
qcs->sd = sedesc_new();
if (!qcs->sd)
goto err;
qcs->sd->se = qcs;
qcs->sd->conn = qcc->conn;
se_fl_set(qcs->sd, SE_FL_T_MUX | SE_FL_ORPHAN | SE_FL_NOT_FIRST);
se_expect_no_data(qcs->sd);
/* Allocate transport layer stream descriptor. Only needed for TX. */
if (!quic_stream_is_uni(id) || !quic_stream_is_remote(qcc, id)) {
struct quic_conn *qc = qcc->conn->handle.qc;
qcs->stream = qc_stream_desc_new(id, type, qcs, qc);
if (!qcs->stream) {
TRACE_ERROR("qc_stream_desc alloc failure", QMUX_EV_QCS_NEW, qcc->conn, qcs);
goto err;
}
}
if (qcc->app_ops->attach && qcc->app_ops->attach(qcs, qcc->ctx)) {
TRACE_ERROR("app proto failure", QMUX_EV_QCS_NEW, qcc->conn, qcs);
goto err;
}
out:
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn, qcs);
return qcs;
err:
qcs_free(qcs);
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn);
return NULL;
}
static forceinline struct stconn *qcs_sc(const struct qcs *qcs)
{
return qcs->sd ? qcs->sd->sc : NULL;
}
/* Reset the <qcc> inactivity timeout for http-keep-alive timeout. */
static forceinline void qcc_reset_idle_start(struct qcc *qcc)
{
qcc->idle_start = now_ms;
}
/* Decrement <qcc> sc. */
static forceinline void qcc_rm_sc(struct qcc *qcc)
{
BUG_ON(!qcc->nb_sc); /* Ensure sc count is always valid (ie >=0). */
--qcc->nb_sc;
/* Reset qcc idle start for http-keep-alive timeout. Timeout will be
* refreshed after this on stream detach.
*/
if (!qcc->nb_sc && !qcc->nb_hreq)
qcc_reset_idle_start(qcc);
}
/* Decrement <qcc> hreq. */
static forceinline void qcc_rm_hreq(struct qcc *qcc)
{
BUG_ON(!qcc->nb_hreq); /* Ensure http req count is always valid (ie >=0). */
--qcc->nb_hreq;
/* Reset qcc idle start for http-keep-alive timeout. Timeout will be
* refreshed after this on I/O handler.
*/
if (!qcc->nb_sc && !qcc->nb_hreq)
qcc_reset_idle_start(qcc);
}
static inline int qcc_is_dead(const struct qcc *qcc)
{
/* Maintain connection if stream endpoints are still active. */
if (qcc->nb_sc)
return 0;
/* Connection considered dead if either :
* - remote error detected at tranport level
* - error detected locally
* - MUX timeout expired
*/
if (qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL_DONE) ||
!qcc->task) {
return 1;
}
return 0;
}
/* Return true if the mux timeout should be armed. */
static inline int qcc_may_expire(struct qcc *qcc)
{
return !qcc->nb_sc;
}
/* Refresh the timeout on <qcc> if needed depending on its state. */
static void qcc_refresh_timeout(struct qcc *qcc)
{
const struct proxy *px = qcc->proxy;
TRACE_ENTER(QMUX_EV_QCC_WAKE, qcc->conn);
if (!qcc->task) {
TRACE_DEVEL("already expired", QMUX_EV_QCC_WAKE, qcc->conn);
goto leave;
}
/* Check if upper layer is responsible of timeout management. */
if (!qcc_may_expire(qcc)) {
TRACE_DEVEL("not eligible for timeout", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->task->expire = TICK_ETERNITY;
task_queue(qcc->task);
goto leave;
}
/* Frontend timeout management
* - shutdown done -> timeout client-fin
* - detached streams with data left to send -> default timeout
* - stream waiting on incomplete request or no stream yet activated -> timeout http-request
* - idle after stream processing -> timeout http-keep-alive
*
* If proxy stop-stop in progress, immediate or spread close will be
* processed if shutdown already one or connection is idle.
*/
if (!conn_is_back(qcc->conn)) {
if (qcc->nb_hreq && !(qcc->flags & QC_CF_APP_SHUT)) {
TRACE_DEVEL("one or more requests still in progress", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->task->expire = tick_add_ifset(now_ms, qcc->timeout);
task_queue(qcc->task);
goto leave;
}
if ((!LIST_ISEMPTY(&qcc->opening_list) || unlikely(!qcc->largest_bidi_r)) &&
!(qcc->flags & QC_CF_APP_SHUT)) {
int timeout = px->timeout.httpreq;
struct qcs *qcs = NULL;
int base_time;
/* Use start time of first stream waiting on HTTP or
* qcc idle if no stream not yet used.
*/
if (likely(!LIST_ISEMPTY(&qcc->opening_list)))
qcs = LIST_ELEM(qcc->opening_list.n, struct qcs *, el_opening);
base_time = qcs ? qcs->start : qcc->idle_start;
TRACE_DEVEL("waiting on http request", QMUX_EV_QCC_WAKE, qcc->conn, qcs);
qcc->task->expire = tick_add_ifset(base_time, timeout);
}
else {
if (qcc->flags & QC_CF_APP_SHUT) {
TRACE_DEVEL("connection in closing", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->task->expire = tick_add_ifset(now_ms,
qcc->shut_timeout);
}
else {
/* Use http-request timeout if keep-alive timeout not set */
int timeout = tick_isset(px->timeout.httpka) ?
px->timeout.httpka : px->timeout.httpreq;
TRACE_DEVEL("at least one request achieved but none currently in progress", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->task->expire = tick_add_ifset(qcc->idle_start, timeout);
}
/* If proxy soft-stop in progress and connection is
* inactive, close the connection immediately. If a
* close-spread-time is configured, randomly spread the
* timer over a closing window.
*/
if ((qcc->proxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) &&
!(global.tune.options & GTUNE_DISABLE_ACTIVE_CLOSE)) {
/* Wake timeout task immediately if window already expired. */
int remaining_window = tick_isset(global.close_spread_end) ?
tick_remain(now_ms, global.close_spread_end) : 0;
TRACE_DEVEL("proxy disabled, prepare connection soft-stop", QMUX_EV_QCC_WAKE, qcc->conn);
if (remaining_window) {
/* We don't need to reset the expire if it would
* already happen before the close window end.
*/
if (!tick_isset(qcc->task->expire) ||
tick_is_le(global.close_spread_end, qcc->task->expire)) {
/* Set an expire value shorter than the current value
* because the close spread window end comes earlier.
*/
qcc->task->expire = tick_add(now_ms,
statistical_prng_range(remaining_window));
}
}
else {
/* We are past the soft close window end, wake the timeout
* task up immediately.
*/
qcc->task->expire = now_ms;
task_wakeup(qcc->task, TASK_WOKEN_TIMER);
}
}
}
}
/* fallback to default timeout if frontend specific undefined or for
* backend connections.
*/
if (!tick_isset(qcc->task->expire)) {
TRACE_DEVEL("fallback to default timeout", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->task->expire = tick_add_ifset(now_ms, qcc->timeout);
}
task_queue(qcc->task);
leave:
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn);
}
/* Mark a stream as open if it was idle. This can be used on every
* successful emission/reception operation to update the stream state.
*/
static void qcs_idle_open(struct qcs *qcs)
{
/* This operation must not be used if the stream is already closed. */
BUG_ON_HOT(qcs->st == QC_SS_CLO);
if (qcs->st == QC_SS_IDLE) {
TRACE_STATE("opening stream", QMUX_EV_QCS_NEW, qcs->qcc->conn, qcs);
qcs->st = QC_SS_OPEN;
}
}
/* Close the local channel of <qcs> instance. */
static void qcs_close_local(struct qcs *qcs)
{
TRACE_STATE("closing stream locally", QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
/* The stream must have already been opened. */
BUG_ON_HOT(qcs->st == QC_SS_IDLE);
/* This operation cannot be used multiple times. */
BUG_ON_HOT(qcs->st == QC_SS_HLOC || qcs->st == QC_SS_CLO);
if (quic_stream_is_bidi(qcs->id)) {
qcs->st = (qcs->st == QC_SS_HREM) ? QC_SS_CLO : QC_SS_HLOC;
if (qcs->flags & QC_SF_HREQ_RECV)
qcc_rm_hreq(qcs->qcc);
}
else {
/* Only local uni streams are valid for this operation. */
BUG_ON_HOT(quic_stream_is_remote(qcs->qcc, qcs->id));
qcs->st = QC_SS_CLO;
}
}
/* Close the remote channel of <qcs> instance. */
static void qcs_close_remote(struct qcs *qcs)
{
TRACE_STATE("closing stream remotely", QMUX_EV_QCS_RECV, qcs->qcc->conn, qcs);
/* The stream must have already been opened. */
BUG_ON_HOT(qcs->st == QC_SS_IDLE);
/* This operation cannot be used multiple times. */
BUG_ON_HOT(qcs->st == QC_SS_HREM || qcs->st == QC_SS_CLO);
if (quic_stream_is_bidi(qcs->id)) {
qcs->st = (qcs->st == QC_SS_HLOC) ? QC_SS_CLO : QC_SS_HREM;
}
else {
/* Only remote uni streams are valid for this operation. */
BUG_ON_HOT(quic_stream_is_local(qcs->qcc, qcs->id));
qcs->st = QC_SS_CLO;
}
}
static int qcs_is_close_local(struct qcs *qcs)
{
return qcs->st == QC_SS_HLOC || qcs->st == QC_SS_CLO;
}
static int qcs_is_close_remote(struct qcs *qcs)
{
return qcs->st == QC_SS_HREM || qcs->st == QC_SS_CLO;
}
/* Allocate if needed buffer <bptr> for stream <qcs>.
*
* Returns the buffer instance or NULL on allocation failure.
*/
struct buffer *qcs_get_buf(struct qcs *qcs, struct buffer *bptr)
{
return b_alloc(bptr);
}
/* Allocate if needed buffer <ncbuf> for stream <qcs>.
*
* Returns the buffer instance or NULL on allocation failure.
*/
static struct ncbuf *qcs_get_ncbuf(struct qcs *qcs, struct ncbuf *ncbuf)
{
struct buffer buf = BUF_NULL;
if (ncb_is_null(ncbuf)) {
if (!b_alloc(&buf))
return NULL;
*ncbuf = ncb_make(buf.area, buf.size, 0);
ncb_init(ncbuf, 0);
}
return ncbuf;
}
/* Notify an eventual subscriber on <qcs> or else wakeup up the stconn layer if
* initialized.
*/
static void qcs_alert(struct qcs *qcs)
{
if (qcs->subs) {
qcs_notify_recv(qcs);
qcs_notify_send(qcs);
}
else if (qcs_sc(qcs) && qcs->sd->sc->app_ops->wake) {
TRACE_POINT(QMUX_EV_STRM_WAKE, qcs->qcc->conn, qcs);
qcs->sd->sc->app_ops->wake(qcs->sd->sc);
}
}
int qcs_subscribe(struct qcs *qcs, int event_type, struct wait_event *es)
{
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_STRM_SEND|QMUX_EV_STRM_RECV, qcc->conn, qcs);
BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
BUG_ON(qcs->subs && qcs->subs != es);
es->events |= event_type;
qcs->subs = es;
if (event_type & SUB_RETRY_RECV)
TRACE_DEVEL("subscribe(recv)", QMUX_EV_STRM_RECV, qcc->conn, qcs);
if (event_type & SUB_RETRY_SEND)
TRACE_DEVEL("subscribe(send)", QMUX_EV_STRM_SEND, qcc->conn, qcs);
TRACE_LEAVE(QMUX_EV_STRM_SEND|QMUX_EV_STRM_RECV, qcc->conn, qcs);
return 0;
}
void qcs_notify_recv(struct qcs *qcs)
{
if (qcs->subs && qcs->subs->events & SUB_RETRY_RECV) {
TRACE_POINT(QMUX_EV_STRM_WAKE, qcs->qcc->conn, qcs);
tasklet_wakeup(qcs->subs->tasklet);
qcs->subs->events &= ~SUB_RETRY_RECV;
if (!qcs->subs->events)
qcs->subs = NULL;
}
}
void qcs_notify_send(struct qcs *qcs)
{
if (qcs->subs && qcs->subs->events & SUB_RETRY_SEND) {
TRACE_POINT(QMUX_EV_STRM_WAKE, qcs->qcc->conn, qcs);
tasklet_wakeup(qcs->subs->tasklet);
qcs->subs->events &= ~SUB_RETRY_SEND;
if (!qcs->subs->events)
qcs->subs = NULL;
}
}
/* A fatal error is detected locally for <qcc> connection. It should be closed
* with a CONNECTION_CLOSE using <err> code. Set <app> to true to indicate that
* the code must be considered as an application level error. This function
* must not be called more than once by connection.
*/
void qcc_set_error(struct qcc *qcc, int err, int app)
{
/* This must not be called multiple times per connection. */
BUG_ON(qcc->flags & QC_CF_ERRL);
TRACE_STATE("connection on error", QMUX_EV_QCC_ERR, qcc->conn);
qcc->flags |= QC_CF_ERRL;
qcc->err = app ? quic_err_app(err) : quic_err_transport(err);
/* TODO
* Ensure qcc_io_send() will be conducted to convert QC_CF_ERRL in
* QC_CF_ERRL_DONE with CONNECTION_CLOSE frame emission. This may be
* unnecessary if we are currently in the MUX tasklet context, but it
* is too tedious too not forget a wakeup outside of this function for
* the moment.
*/
tasklet_wakeup(qcc->wait_event.tasklet);
}
/* Open a locally initiated stream for the connection <qcc>. Set <bidi> for a
* bidirectional stream, else an unidirectional stream is opened. The next
* available ID on the connection will be used according to the stream type.
*
* Returns the allocated stream instance or NULL on error.
*/
struct qcs *qcc_init_stream_local(struct qcc *qcc, int bidi)
{
struct qcs *qcs;
enum qcs_type type;
uint64_t *next;
TRACE_ENTER(QMUX_EV_QCS_NEW, qcc->conn);
if (bidi) {
next = &qcc->next_bidi_l;
type = conn_is_back(qcc->conn) ? QCS_CLT_BIDI : QCS_SRV_BIDI;
}
else {
next = &qcc->next_uni_l;
type = conn_is_back(qcc->conn) ? QCS_CLT_UNI : QCS_SRV_UNI;
}
/* TODO ensure that we won't overflow remote peer flow control limit on
* streams. Else, we should emit a STREAMS_BLOCKED frame.
*/
qcs = qcs_new(qcc, *next, type);
if (!qcs) {
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn);
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
return NULL;
}
TRACE_PROTO("opening local stream", QMUX_EV_QCS_NEW, qcc->conn, qcs);
*next += 4;
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn, qcs);
return qcs;
}
/* Open a remote initiated stream for the connection <qcc> with ID <id>. The
* caller is responsible to ensure that a stream with the same ID was not
* already opened. This function will also create all intermediaries streams
* with ID smaller than <id> not already opened before.
*
* Returns the allocated stream instance or NULL on error.
*/
static struct qcs *qcc_init_stream_remote(struct qcc *qcc, uint64_t id)
{
struct qcs *qcs = NULL;
enum qcs_type type;
uint64_t *largest, max_id;
TRACE_ENTER(QMUX_EV_QCS_NEW, qcc->conn);
/* Function reserved to remote stream IDs. */
BUG_ON(quic_stream_is_local(qcc, id));
if (quic_stream_is_bidi(id)) {
largest = &qcc->largest_bidi_r;
type = conn_is_back(qcc->conn) ? QCS_SRV_BIDI : QCS_CLT_BIDI;
}
else {
largest = &qcc->largest_uni_r;
type = conn_is_back(qcc->conn) ? QCS_SRV_UNI : QCS_CLT_UNI;
}
/* RFC 9000 4.6. Controlling Concurrency
*
* An endpoint that receives a frame with a stream ID exceeding the
* limit it has sent MUST treat this as a connection error of type
* STREAM_LIMIT_ERROR
*/
max_id = quic_stream_is_bidi(id) ? qcc->lfctl.ms_bidi * 4 :
qcc->lfctl.ms_uni * 4;
if (id >= max_id) {
TRACE_ERROR("flow control error", QMUX_EV_QCS_NEW|QMUX_EV_PROTO_ERR, qcc->conn);
qcc_set_error(qcc, QC_ERR_STREAM_LIMIT_ERROR, 0);
goto err;
}
/* Only stream ID not already opened can be used. */
BUG_ON(id < *largest);
while (id >= *largest) {
const char *str = *largest < id ? "initializing intermediary remote stream" :
"initializing remote stream";
qcs = qcs_new(qcc, *largest, type);
if (!qcs) {
TRACE_ERROR("stream fallocation failure", QMUX_EV_QCS_NEW, qcc->conn);
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
goto err;
}
TRACE_PROTO(str, QMUX_EV_QCS_NEW, qcc->conn, qcs);
*largest += 4;
}
out:
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn, qcs);
return qcs;
err:
TRACE_LEAVE(QMUX_EV_QCS_NEW, qcc->conn);
return NULL;
}
struct stconn *qcs_attach_sc(struct qcs *qcs, struct buffer *buf, char fin)
{
struct qcc *qcc = qcs->qcc;
struct session *sess = qcc->conn->owner;
/* TODO duplicated from mux_h2 */
sess->t_idle = ns_to_ms(now_ns - sess->accept_ts) - sess->t_handshake;
if (!sc_new_from_endp(qcs->sd, sess, buf))
return NULL;
/* QC_SF_HREQ_RECV must be set once for a stream. Else, nb_hreq counter
* will be incorrect for the connection.
*/
BUG_ON_HOT(qcs->flags & QC_SF_HREQ_RECV);
qcs->flags |= QC_SF_HREQ_RECV;
++qcc->nb_sc;
++qcc->nb_hreq;
/* TODO duplicated from mux_h2 */
sess->accept_date = date;
sess->accept_ts = now_ns;
sess->t_handshake = 0;
sess->t_idle = 0;
/* A stream must have been registered for HTTP wait before attaching
* it to sedesc. See <qcs_wait_http_req> for more info.
*/
BUG_ON_HOT(!LIST_INLIST(&qcs->el_opening));
LIST_DEL_INIT(&qcs->el_opening);
if (fin) {
TRACE_STATE("report end-of-input", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set(qcs->sd, SE_FL_EOI);
}
/* A QCS can be already locally closed before stream layer
* instantiation. This notably happens if STOP_SENDING was the first
* frame received for this instance. In this case, an error is
* immediately to the stream layer to prevent transmission.
*
* TODO it could be better to not instantiate at all the stream layer.
* However, extra care is required to ensure QCS instance is released.
*/
if (unlikely(qcs_is_close_local(qcs) || (qcs->flags & QC_SF_TO_RESET))) {
TRACE_STATE("report early error", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set_error(qcs->sd);
}
return qcs->sd->sc;
}
/* Use this function for a stream <id> which is not in <qcc> stream tree. It
* returns true if the associated stream is closed.
*/
static int qcc_stream_id_is_closed(struct qcc *qcc, uint64_t id)
{
uint64_t *largest;
/* This function must only be used for stream not present in the stream tree. */
BUG_ON_HOT(eb64_lookup(&qcc->streams_by_id, id));
if (quic_stream_is_local(qcc, id)) {
largest = quic_stream_is_uni(id) ? &qcc->next_uni_l :
&qcc->next_bidi_l;
}
else {
largest = quic_stream_is_uni(id) ? &qcc->largest_uni_r :
&qcc->largest_bidi_r;
}
return id < *largest;
}
/* Retrieve the stream instance from <id> ID. This can be used when receiving
* STREAM, STREAM_DATA_BLOCKED, RESET_STREAM, MAX_STREAM_DATA or STOP_SENDING
* frames. Set to false <receive_only> or <send_only> if these particular types
* of streams are not allowed. If the stream instance is found, it is stored in
* <out>.
*
* Returns 0 on success else non-zero. On error, a RESET_STREAM or a
* CONNECTION_CLOSE is automatically emitted. Beware that <out> may be NULL
* on success if the stream has already been closed.
*/
int qcc_get_qcs(struct qcc *qcc, uint64_t id, int receive_only, int send_only,
struct qcs **out)
{
struct eb64_node *node;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
*out = NULL;
if (!receive_only && quic_stream_is_uni(id) && quic_stream_is_remote(qcc, id)) {
TRACE_ERROR("receive-only stream not allowed", QMUX_EV_QCC_RECV|QMUX_EV_QCC_NQCS|QMUX_EV_PROTO_ERR, qcc->conn, NULL, &id);
qcc_set_error(qcc, QC_ERR_STREAM_STATE_ERROR, 0);
goto err;
}
if (!send_only && quic_stream_is_uni(id) && quic_stream_is_local(qcc, id)) {
TRACE_ERROR("send-only stream not allowed", QMUX_EV_QCC_RECV|QMUX_EV_QCC_NQCS|QMUX_EV_PROTO_ERR, qcc->conn, NULL, &id);
qcc_set_error(qcc, QC_ERR_STREAM_STATE_ERROR, 0);
goto err;
}
/* Search the stream in the connection tree. */
node = eb64_lookup(&qcc->streams_by_id, id);
if (node) {
*out = eb64_entry(node, struct qcs, by_id);
TRACE_DEVEL("using stream from connection tree", QMUX_EV_QCC_RECV, qcc->conn, *out);
goto out;
}
/* Check if stream is already closed. */
if (qcc_stream_id_is_closed(qcc, id)) {
TRACE_DATA("already closed stream", QMUX_EV_QCC_RECV|QMUX_EV_QCC_NQCS, qcc->conn, NULL, &id);
/* Consider this as a success even if <out> is left NULL. */
goto out;
}
/* Create the stream. This is valid only for remote initiated one. A
* local stream must have already been explicitly created by the
* application protocol layer.
*/
if (quic_stream_is_local(qcc, id)) {
/* RFC 9000 19.8. STREAM Frames
*
* An endpoint MUST terminate the connection with error
* STREAM_STATE_ERROR if it receives a STREAM frame for a locally
* initiated stream that has not yet been created, or for a send-only
* stream.
*/
TRACE_ERROR("locally initiated stream not yet created", QMUX_EV_QCC_RECV|QMUX_EV_QCC_NQCS|QMUX_EV_PROTO_ERR, qcc->conn, NULL, &id);
qcc_set_error(qcc, QC_ERR_STREAM_STATE_ERROR, 0);
goto err;
}
else {
/* Remote stream not found - try to open it. */
*out = qcc_init_stream_remote(qcc, id);
if (!*out) {
TRACE_ERROR("stream creation error", QMUX_EV_QCC_RECV|QMUX_EV_QCC_NQCS, qcc->conn, NULL, &id);
goto err;
}
}
out:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn, *out);
return 0;
err:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
/* Simple function to duplicate a buffer */
static inline struct buffer qcs_b_dup(const struct ncbuf *b)
{
return b_make(ncb_orig(b), b->size, b->head, ncb_data(b, 0));
}
/* Remove <bytes> from <qcs> Rx buffer. Flow-control for received offsets may
* be allocated for the peer if needed.
*/
static void qcs_consume(struct qcs *qcs, uint64_t bytes)
{
struct qcc *qcc = qcs->qcc;
struct quic_frame *frm;
struct ncbuf *buf = &qcs->rx.ncbuf;
enum ncb_ret ret;
TRACE_ENTER(QMUX_EV_QCS_RECV, qcc->conn, qcs);
ret = ncb_advance(buf, bytes);
if (ret) {
ABORT_NOW(); /* should not happens because removal only in data */
}
if (ncb_is_empty(buf))
qcs_free_ncbuf(qcs, buf);
qcs->rx.offset += bytes;
/* Not necessary to emit a MAX_STREAM_DATA if all data received. */
if (qcs->flags & QC_SF_SIZE_KNOWN)
goto conn_fctl;
if (qcs->rx.msd - qcs->rx.offset < qcs->rx.msd_init / 2) {
TRACE_DATA("increase stream credit via MAX_STREAM_DATA", QMUX_EV_QCS_RECV, qcc->conn, qcs);
frm = qc_frm_alloc(QUIC_FT_MAX_STREAM_DATA);
if (!frm) {
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
return;
}
qcs->rx.msd = qcs->rx.offset + qcs->rx.msd_init;
frm->max_stream_data.id = qcs->id;
frm->max_stream_data.max_stream_data = qcs->rx.msd;
LIST_APPEND(&qcc->lfctl.frms, &frm->list);
tasklet_wakeup(qcc->wait_event.tasklet);
}
conn_fctl:
qcc->lfctl.offsets_consume += bytes;
if (qcc->lfctl.md - qcc->lfctl.offsets_consume < qcc->lfctl.md_init / 2) {
TRACE_DATA("increase conn credit via MAX_DATA", QMUX_EV_QCS_RECV, qcc->conn, qcs);
frm = qc_frm_alloc(QUIC_FT_MAX_DATA);
if (!frm) {
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
return;
}
qcc->lfctl.md = qcc->lfctl.offsets_consume + qcc->lfctl.md_init;
frm->max_data.max_data = qcc->lfctl.md;
LIST_APPEND(&qcs->qcc->lfctl.frms, &frm->list);
tasklet_wakeup(qcs->qcc->wait_event.tasklet);
}
TRACE_LEAVE(QMUX_EV_QCS_RECV, qcc->conn, qcs);
}
/* Decode the content of STREAM frames already received on the stream instance
* <qcs>.
*
* Returns 0 on success else non-zero.
*/
static int qcc_decode_qcs(struct qcc *qcc, struct qcs *qcs)
{
struct buffer b;
ssize_t ret;
int fin = 0;
TRACE_ENTER(QMUX_EV_QCS_RECV, qcc->conn, qcs);
b = qcs_b_dup(&qcs->rx.ncbuf);
/* Signal FIN to application if STREAM FIN received with all data. */
if (qcs_is_close_remote(qcs))
fin = 1;
if (!(qcs->flags & QC_SF_READ_ABORTED)) {
ret = qcc->app_ops->decode_qcs(qcs, &b, fin);
if (ret < 0) {
TRACE_ERROR("decoding error", QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto err;
}
if (qcs->flags & QC_SF_TO_RESET) {
if (qcs_sc(qcs) && !se_fl_test(qcs->sd, SE_FL_ERROR|SE_FL_ERR_PENDING)) {
se_fl_set_error(qcs->sd);
qcs_alert(qcs);
}
}
}
else {
TRACE_DATA("ignore read on stream", QMUX_EV_QCS_RECV, qcc->conn, qcs);
ret = b_data(&b);
}
if (ret)
qcs_consume(qcs, ret);
if (ret || (!b_data(&b) && fin))
qcs_notify_recv(qcs);
TRACE_LEAVE(QMUX_EV_QCS_RECV, qcc->conn, qcs);
return 0;
err:
TRACE_LEAVE(QMUX_EV_QCS_RECV, qcc->conn, qcs);
return 1;
}
/* Prepare for the emission of RESET_STREAM on <qcs> with error code <err>. */
void qcc_reset_stream(struct qcs *qcs, int err)
{
struct qcc *qcc = qcs->qcc;
if ((qcs->flags & QC_SF_TO_RESET) || qcs_is_close_local(qcs))
return;
TRACE_STATE("reset stream", QMUX_EV_QCS_END, qcc->conn, qcs);
qcs->flags |= QC_SF_TO_RESET;
qcs->err = err;
/* Remove prepared stream data from connection flow-control calcul. */
if (qcs->tx.offset > qcs->tx.sent_offset) {
const uint64_t diff = qcs->tx.offset - qcs->tx.sent_offset;
BUG_ON(qcc->tx.offsets - diff < qcc->tx.sent_offsets);
qcc->tx.offsets -= diff;
/* Reset qcs offset to prevent BUG_ON() on qcs_destroy(). */
qcs->tx.offset = qcs->tx.sent_offset;
}
/* Report send error to stream-endpoint layer. */
if (qcs_sc(qcs)) {
se_fl_set_error(qcs->sd);
qcs_alert(qcs);
}
qcc_send_stream(qcs, 1);
tasklet_wakeup(qcc->wait_event.tasklet);
}
/* Register <qcs> stream for emission of STREAM, STOP_SENDING or RESET_STREAM.
* Set <urg> to 1 if stream content should be treated in priority compared to
* other streams.
*/
void qcc_send_stream(struct qcs *qcs, int urg)
{
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
/* Cannot send if already closed. */
BUG_ON(qcs_is_close_local(qcs));
if (urg) {
LIST_DEL_INIT(&qcs->el_send);
LIST_INSERT(&qcc->send_list, &qcs->el_send);
}
else {
if (!LIST_INLIST(&qcs->el_send))
LIST_APPEND(&qcs->qcc->send_list, &qcs->el_send);
}
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
}
/* Prepare for the emission of STOP_SENDING on <qcs>. */
void qcc_abort_stream_read(struct qcs *qcs)
{
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_QCC_NEW, qcc->conn, qcs);
if ((qcs->flags & QC_SF_TO_STOP_SENDING) || qcs_is_close_remote(qcs))
goto end;
TRACE_STATE("abort stream read", QMUX_EV_QCS_END, qcc->conn, qcs);
qcs->flags |= (QC_SF_TO_STOP_SENDING|QC_SF_READ_ABORTED);
qcc_send_stream(qcs, 1);
tasklet_wakeup(qcc->wait_event.tasklet);
end:
TRACE_LEAVE(QMUX_EV_QCC_NEW, qcc->conn, qcs);
}
/* Install the <app_ops> applicative layer of a QUIC connection on mux <qcc>.
* Returns 0 on success else non-zero.
*/
int qcc_install_app_ops(struct qcc *qcc, const struct qcc_app_ops *app_ops)
{
TRACE_ENTER(QMUX_EV_QCC_NEW, qcc->conn);
if (app_ops->init && !app_ops->init(qcc)) {
TRACE_ERROR("app ops init error", QMUX_EV_QCC_NEW, qcc->conn);
goto err;
}
TRACE_PROTO("application layer initialized", QMUX_EV_QCC_NEW, qcc->conn);
qcc->app_ops = app_ops;
/* RFC 9114 7.2.4.2. Initialization
*
* Endpoints MUST NOT require any data to be
* received from the peer prior to sending the SETTINGS frame;
* settings MUST be sent as soon as the transport is ready to
* send data.
*/
if (qcc->app_ops->finalize) {
if (qcc->app_ops->finalize(qcc->ctx)) {
TRACE_ERROR("app ops finalize error", QMUX_EV_QCC_NEW, qcc->conn);
goto err;
}
tasklet_wakeup(qcc->wait_event.tasklet);
}
TRACE_LEAVE(QMUX_EV_QCC_NEW, qcc->conn);
return 0;
err:
TRACE_LEAVE(QMUX_EV_QCC_NEW, qcc->conn);
return 1;
}
/* Handle a new STREAM frame for stream with id <id>. Payload is pointed by
* <data> with length <len> and represents the offset <offset>. <fin> is set if
* the QUIC frame FIN bit is set.
*
* Returns 0 on success else non-zero. On error, the received frame should not
* be acknowledged.
*/
int qcc_recv(struct qcc *qcc, uint64_t id, uint64_t len, uint64_t offset,
char fin, char *data)
{
struct qcs *qcs;
enum ncb_ret ret;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_ERRL) {
TRACE_DATA("connection on error", QMUX_EV_QCC_RECV, qcc->conn);
goto err;
}
/* RFC 9000 19.8. STREAM Frames
*
* An endpoint MUST terminate the connection with error
* STREAM_STATE_ERROR if it receives a STREAM frame for a locally
* initiated stream that has not yet been created, or for a send-only
* stream.
*/
if (qcc_get_qcs(qcc, id, 1, 0, &qcs)) {
TRACE_DATA("qcs retrieval error", QMUX_EV_QCC_RECV, qcc->conn);
goto err;
}
if (!qcs) {
TRACE_DATA("already closed stream", QMUX_EV_QCC_RECV, qcc->conn);
goto out;
}
/* RFC 9000 4.5. Stream Final Size
*
* Once a final size for a stream is known, it cannot change. If a
* RESET_STREAM or STREAM frame is received indicating a change in the
* final size for the stream, an endpoint SHOULD respond with an error
* of type FINAL_SIZE_ERROR; see Section 11 for details on error
* handling.
*/
if (qcs->flags & QC_SF_SIZE_KNOWN &&
(offset + len > qcs->rx.offset_max || (fin && offset + len < qcs->rx.offset_max))) {
TRACE_ERROR("final size error", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV|QMUX_EV_PROTO_ERR, qcc->conn, qcs);
qcc_set_error(qcc, QC_ERR_FINAL_SIZE_ERROR, 0);
goto err;
}
if (qcs_is_close_remote(qcs)) {
TRACE_DATA("skipping STREAM for remotely closed", QMUX_EV_QCC_RECV, qcc->conn);
goto out;
}
if (offset + len < qcs->rx.offset ||
(offset + len == qcs->rx.offset && (!fin || (qcs->flags & QC_SF_SIZE_KNOWN)))) {
TRACE_DATA("already received offset", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto out;
}
TRACE_PROTO("receiving STREAM", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
qcs_idle_open(qcs);
if (offset + len > qcs->rx.offset_max) {
uint64_t diff = offset + len - qcs->rx.offset_max;
qcs->rx.offset_max = offset + len;
qcc->lfctl.offsets_recv += diff;
if (offset + len > qcs->rx.msd ||
qcc->lfctl.offsets_recv > qcc->lfctl.md) {
/* RFC 9000 4.1. Data Flow Control
*
* A receiver MUST close the connection with an error
* of type FLOW_CONTROL_ERROR if the sender violates
* the advertised connection or stream data limits
*/
TRACE_ERROR("flow control error", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV|QMUX_EV_PROTO_ERR,
qcc->conn, qcs);
qcc_set_error(qcc, QC_ERR_FLOW_CONTROL_ERROR, 0);
goto err;
}
}
if (!qcs_get_ncbuf(qcs, &qcs->rx.ncbuf) || ncb_is_null(&qcs->rx.ncbuf)) {
TRACE_ERROR("receive ncbuf alloc failure", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
goto err;
}
TRACE_DATA("newly received offset", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
if (offset < qcs->rx.offset) {
size_t diff = qcs->rx.offset - offset;
len -= diff;
data += diff;
offset = qcs->rx.offset;
}
if (len) {
ret = ncb_add(&qcs->rx.ncbuf, offset - qcs->rx.offset, data, len, NCB_ADD_COMPARE);
switch (ret) {
case NCB_RET_OK:
break;
case NCB_RET_DATA_REJ:
/* RFC 9000 2.2. Sending and Receiving Data
*
* An endpoint could receive data for a stream at the
* same stream offset multiple times. Data that has
* already been received can be discarded. The data at
* a given offset MUST NOT change if it is sent
* multiple times; an endpoint MAY treat receipt of
* different data at the same offset within a stream as
* a connection error of type PROTOCOL_VIOLATION.
*/
TRACE_ERROR("overlapping data rejected", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV|QMUX_EV_PROTO_ERR,
qcc->conn, qcs);
qcc_set_error(qcc, QC_ERR_PROTOCOL_VIOLATION, 0);
return 1;
case NCB_RET_GAP_SIZE:
TRACE_DATA("cannot bufferize frame due to gap size limit", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV,
qcc->conn, qcs);
return 1;
}
}
if (fin)
qcs->flags |= QC_SF_SIZE_KNOWN;
if (qcs->flags & QC_SF_SIZE_KNOWN &&
qcs->rx.offset_max == qcs->rx.offset + ncb_data(&qcs->rx.ncbuf, 0)) {
qcs_close_remote(qcs);
}
if ((ncb_data(&qcs->rx.ncbuf, 0) && !(qcs->flags & QC_SF_DEM_FULL)) || fin) {
qcc_decode_qcs(qcc, qcs);
qcc_refresh_timeout(qcc);
}
out:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
err:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
/* Handle a new MAX_DATA frame. <max> must contains the maximum data field of
* the frame.
*
* Returns 0 on success else non-zero.
*/
int qcc_recv_max_data(struct qcc *qcc, uint64_t max)
{
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
TRACE_PROTO("receiving MAX_DATA", QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->rfctl.md < max) {
qcc->rfctl.md = max;
TRACE_DATA("increase remote max-data", QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_BLK_MFCTL) {
qcc->flags &= ~QC_CF_BLK_MFCTL;
tasklet_wakeup(qcc->wait_event.tasklet);
}
}
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
}
/* Handle a new MAX_STREAM_DATA frame. <max> must contains the maximum data
* field of the frame and <id> is the identifier of the QUIC stream.
*
* Returns 0 on success else non-zero. On error, the received frame should not
* be acknowledged.
*/
int qcc_recv_max_stream_data(struct qcc *qcc, uint64_t id, uint64_t max)
{
struct qcs *qcs;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_ERRL) {
TRACE_DATA("connection on error", QMUX_EV_QCC_RECV, qcc->conn);
goto err;
}
/* RFC 9000 19.10. MAX_STREAM_DATA Frames
*
* Receiving a MAX_STREAM_DATA frame for a locally
* initiated stream that has not yet been created MUST be treated as a
* connection error of type STREAM_STATE_ERROR. An endpoint that
* receives a MAX_STREAM_DATA frame for a receive-only stream MUST
* terminate the connection with error STREAM_STATE_ERROR.
*/
if (qcc_get_qcs(qcc, id, 0, 1, &qcs))
goto err;
if (qcs) {
TRACE_PROTO("receiving MAX_STREAM_DATA", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
if (max > qcs->tx.msd) {
qcs->tx.msd = max;
TRACE_DATA("increase remote max-stream-data", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
if (qcs->flags & QC_SF_BLK_SFCTL) {
qcs->flags &= ~QC_SF_BLK_SFCTL;
/* TODO optim: only wakeup IO-CB if stream has data to sent. */
tasklet_wakeup(qcc->wait_event.tasklet);
}
}
}
if (qcc_may_expire(qcc) && !qcc->nb_hreq)
qcc_refresh_timeout(qcc);
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
/* Handle a new RESET_STREAM frame from stream ID <id> with error code <err>
* and final stream size <final_size>.
*
* Returns 0 on success else non-zero. On error, the received frame should not
* be acknowledged.
*/
int qcc_recv_reset_stream(struct qcc *qcc, uint64_t id, uint64_t err, uint64_t final_size)
{
struct qcs *qcs;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_ERRL) {
TRACE_DATA("connection on error", QMUX_EV_QCC_RECV, qcc->conn);
goto err;
}
/* RFC 9000 19.4. RESET_STREAM Frames
*
* An endpoint that receives a RESET_STREAM frame for a send-only stream
* MUST terminate the connection with error STREAM_STATE_ERROR.
*/
if (qcc_get_qcs(qcc, id, 1, 0, &qcs)) {
TRACE_ERROR("RESET_STREAM for send-only stream received", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto err;
}
/* RFC 9000 3.2. Receiving Stream States
*
* A RESET_STREAM signal might be suppressed or withheld
* if stream data is completely received and is buffered to be read by
* the application. If the RESET_STREAM is suppressed, the receiving
* part of the stream remains in "Data Recvd".
*/
if (!qcs || qcs_is_close_remote(qcs))
goto out;
TRACE_PROTO("receiving RESET_STREAM", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
qcs_idle_open(qcs);
/* Ensure stream closure is not forbidden by application protocol. */
if (qcc->app_ops->close) {
if (qcc->app_ops->close(qcs, QCC_APP_OPS_CLOSE_SIDE_RD)) {
TRACE_ERROR("closure rejected by app layer", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto out;
}
}
if (qcs->rx.offset_max > final_size ||
((qcs->flags & QC_SF_SIZE_KNOWN) && qcs->rx.offset_max != final_size)) {
TRACE_ERROR("final size error on RESET_STREAM", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
qcc_set_error(qcc, QC_ERR_FINAL_SIZE_ERROR, 0);
goto err;
}
/* RFC 9000 3.2. Receiving Stream States
*
* An
* implementation MAY interrupt delivery of stream data, discard any
* data that was not consumed, and signal the receipt of the
* RESET_STREAM.
*/
qcs->flags |= QC_SF_SIZE_KNOWN|QC_SF_RECV_RESET;
qcs_close_remote(qcs);
qcs_free_ncbuf(qcs, &qcs->rx.ncbuf);
out:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
err:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
/* Handle a new STOP_SENDING frame for stream ID <id>. The error code should be
* specified in <err>.
*
* Returns 0 on success else non-zero. On error, the received frame should not
* be acknowledged.
*/
int qcc_recv_stop_sending(struct qcc *qcc, uint64_t id, uint64_t err)
{
struct qcs *qcs;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_ERRL) {
TRACE_DATA("connection on error", QMUX_EV_QCC_RECV, qcc->conn);
goto err;
}
/* RFC 9000 19.5. STOP_SENDING Frames
*
* Receiving a STOP_SENDING frame for a
* locally initiated stream that has not yet been created MUST be
* treated as a connection error of type STREAM_STATE_ERROR. An
* endpoint that receives a STOP_SENDING frame for a receive-only stream
* MUST terminate the connection with error STREAM_STATE_ERROR.
*/
if (qcc_get_qcs(qcc, id, 0, 1, &qcs))
goto err;
if (!qcs)
goto out;
TRACE_PROTO("receiving STOP_SENDING", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
/* RFC 9000 3.5. Solicited State Transitions
*
* 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.
*/
/* TODO thanks to previous RFC clause, STOP_SENDING is ignored if current stream
* has already been closed locally. This is useful to not emit multiple
* RESET_STREAM for a single stream. This is functional if stream is
* locally closed due to all data transmitted, but in this case the RFC
* advices to use an explicit RESET_STREAM.
*/
if (qcs_is_close_local(qcs)) {
TRACE_STATE("ignoring STOP_SENDING", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto out;
}
qcs_idle_open(qcs);
if (qcc->app_ops->close) {
if (qcc->app_ops->close(qcs, QCC_APP_OPS_CLOSE_SIDE_WR)) {
TRACE_ERROR("closure rejected by app layer", QMUX_EV_QCC_RECV|QMUX_EV_QCS_RECV, qcc->conn, qcs);
goto out;
}
}
/* If FIN already reached, future RESET_STREAMS will be ignored.
* Manually set EOS in this case.
*/
if (qcs_sc(qcs) && se_fl_test(qcs->sd, SE_FL_EOI)) {
se_fl_set(qcs->sd, SE_FL_EOS);
qcs_alert(qcs);
}
/* RFC 9000 3.5. Solicited State Transitions
*
* An endpoint that receives a STOP_SENDING frame
* MUST send a RESET_STREAM frame if the stream is in the "Ready" or
* "Send" state. If the stream is in the "Data Sent" state, the
* endpoint MAY defer sending the RESET_STREAM frame until the packets
* containing outstanding data are acknowledged or declared lost. If
* any outstanding data is declared lost, the endpoint SHOULD send a
* RESET_STREAM frame instead of retransmitting the data.
*
* An endpoint SHOULD copy the error code from the STOP_SENDING frame to
* the RESET_STREAM frame it sends, but it can use any application error
* code.
*/
qcc_reset_stream(qcs, err);
if (qcc_may_expire(qcc) && !qcc->nb_hreq)
qcc_refresh_timeout(qcc);
out:
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCC_RECV, qcc->conn);
return 1;
}
/* Signal the closing of remote stream with id <id>. Flow-control for new
* streams may be allocated for the peer if needed.
*/
static int qcc_release_remote_stream(struct qcc *qcc, uint64_t id)
{
struct quic_frame *frm;
TRACE_ENTER(QMUX_EV_QCS_END, qcc->conn);
if (quic_stream_is_bidi(id)) {
++qcc->lfctl.cl_bidi_r;
if (qcc->lfctl.cl_bidi_r > qcc->lfctl.ms_bidi_init / 2) {
TRACE_DATA("increase max stream limit with MAX_STREAMS_BIDI", QMUX_EV_QCC_SEND, qcc->conn);
frm = qc_frm_alloc(QUIC_FT_MAX_STREAMS_BIDI);
if (!frm) {
qcc_set_error(qcc, QC_ERR_INTERNAL_ERROR, 0);
goto err;
}
frm->max_streams_bidi.max_streams = qcc->lfctl.ms_bidi +
qcc->lfctl.cl_bidi_r;
LIST_APPEND(&qcc->lfctl.frms, &frm->list);
tasklet_wakeup(qcc->wait_event.tasklet);
qcc->lfctl.ms_bidi += qcc->lfctl.cl_bidi_r;
qcc->lfctl.cl_bidi_r = 0;
}
}
else {
/* TODO unidirectional stream flow control with MAX_STREAMS_UNI
* emission not implemented. It should be unnecessary for
* HTTP/3 but may be required if other application protocols
* are supported.
*/
}
TRACE_LEAVE(QMUX_EV_QCS_END, qcc->conn);
return 0;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCS_END, qcc->conn);
return 1;
}
/* detaches the QUIC stream from its QCC and releases it to the QCS pool. */
static void qcs_destroy(struct qcs *qcs)
{
struct qcc *qcc = qcs->qcc;
struct connection *conn = qcc->conn;
const uint64_t id = qcs->id;
TRACE_ENTER(QMUX_EV_QCS_END, conn, qcs);
/* MUST not removed a stream with sending prepared data left. This is
* to ensure consistency on connection flow-control calculation.
*/
BUG_ON(qcs->tx.offset < qcs->tx.sent_offset);
if (!(qcc->flags & QC_CF_ERRL)) {
if (quic_stream_is_remote(qcc, id))
qcc_release_remote_stream(qcc, id);
}
qcs_free(qcs);
TRACE_LEAVE(QMUX_EV_QCS_END, conn);
}
/* Transfer as much as possible data on <qcs> from <in> to <out>. This is done
* in respect with available flow-control at stream and connection level.
*
* Returns the total bytes of transferred data or a negative error code.
*/
static int qcs_xfer_data(struct qcs *qcs, struct buffer *out, struct buffer *in)
{
struct qcc *qcc = qcs->qcc;
int left, to_xfer;
int total = 0;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
if (!qcs_get_buf(qcs, out)) {
TRACE_ERROR("buffer alloc failure", QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto err;
}
/*
* QCS out buffer diagram
* head left to_xfer
* -------------> ----------> ----->
* --------------------------------------------------
* |...............|xxxxxxxxxxx|<<<<<
* --------------------------------------------------
* ^ ack-off ^ sent-off ^ off
*
* STREAM frame
* ^ ^
* |xxxxxxxxxxxxxxxxx|
*/
BUG_ON_HOT(qcs->tx.sent_offset < qcs->stream->ack_offset);
BUG_ON_HOT(qcs->tx.offset < qcs->tx.sent_offset);
BUG_ON_HOT(qcc->tx.offsets < qcc->tx.sent_offsets);
left = qcs->tx.offset - qcs->tx.sent_offset;
to_xfer = QUIC_MIN(b_data(in), b_room(out));
BUG_ON_HOT(qcs->tx.offset > qcs->tx.msd);
/* do not exceed flow control limit */
if (qcs->tx.offset + to_xfer > qcs->tx.msd) {
TRACE_DATA("do not exceed stream flow control", QMUX_EV_QCS_SEND, qcc->conn, qcs);
to_xfer = qcs->tx.msd - qcs->tx.offset;
}
BUG_ON_HOT(qcc->tx.offsets > qcc->rfctl.md);
/* do not overcome flow control limit on connection */
if (qcc->tx.offsets + to_xfer > qcc->rfctl.md) {
TRACE_DATA("do not exceed conn flow control", QMUX_EV_QCS_SEND, qcc->conn, qcs);
to_xfer = qcc->rfctl.md - qcc->tx.offsets;
}
if (!left && !to_xfer)
goto out;
total = b_force_xfer(out, in, to_xfer);
out:
{
struct qcs_xfer_data_trace_arg arg = {
.prep = b_data(out), .xfer = total,
};
TRACE_LEAVE(QMUX_EV_QCS_SEND|QMUX_EV_QCS_XFER_DATA,
qcc->conn, qcs, &arg);
}
return total;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCS_SEND, qcc->conn, qcs);
return -1;
}
/* Prepare a STREAM frame for <qcs> instance using <out> as payload. The frame
* is appended in <frm_list>. Set <fin> if this is supposed to be the last
* stream frame. If <out> is NULL an empty STREAM frame is built : this may be
* useful if FIN needs to be sent without any data left.
*
* Returns the payload length of the STREAM frame or a negative error code.
*/
static int qcs_build_stream_frm(struct qcs *qcs, struct buffer *out, char fin,
struct list *frm_list)
{
struct qcc *qcc = qcs->qcc;
struct quic_frame *frm;
int head, total;
uint64_t base_off;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
/* if ack_offset < buf_offset, it points to an older buffer. */
base_off = MAX(qcs->stream->buf_offset, qcs->stream->ack_offset);
BUG_ON(qcs->tx.sent_offset < base_off);
head = qcs->tx.sent_offset - base_off;
total = out ? b_data(out) - head : 0;
BUG_ON(total < 0);
if (!total && !fin) {
/* No need to send anything if total is NULL and no FIN to signal. */
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
return 0;
}
BUG_ON((!total && qcs->tx.sent_offset > qcs->tx.offset) ||
(total && qcs->tx.sent_offset >= qcs->tx.offset));
BUG_ON(qcs->tx.sent_offset + total > qcs->tx.offset);
BUG_ON(qcc->tx.sent_offsets + total > qcc->rfctl.md);
TRACE_PROTO("sending STREAM frame", QMUX_EV_QCS_SEND, qcc->conn, qcs);
frm = qc_frm_alloc(QUIC_FT_STREAM_8);
if (!frm) {
TRACE_ERROR("frame alloc failure", QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto err;
}
frm->stream.stream = qcs->stream;
frm->stream.id = qcs->id;
frm->stream.offset.key = 0;
frm->stream.dup = 0;
if (total) {
frm->stream.buf = out;
frm->stream.data = (unsigned char *)b_peek(out, head);
}
else {
/* Empty STREAM frame. */
frm->stream.buf = NULL;
frm->stream.data = NULL;
}
/* FIN is positioned only when the buffer has been totally emptied. */
if (fin)
frm->type |= QUIC_STREAM_FRAME_TYPE_FIN_BIT;
if (qcs->tx.sent_offset) {
frm->type |= QUIC_STREAM_FRAME_TYPE_OFF_BIT;
frm->stream.offset.key = qcs->tx.sent_offset;
}
/* Always set length bit as we do not know if there is remaining frames
* in the final packet after this STREAM.
*/
frm->type |= QUIC_STREAM_FRAME_TYPE_LEN_BIT;
frm->stream.len = total;
LIST_APPEND(frm_list, &frm->list);
out:
{
struct qcs_build_stream_trace_arg arg = {
.len = frm->stream.len, .fin = fin,
.offset = frm->stream.offset.key,
};
TRACE_LEAVE(QMUX_EV_QCS_SEND|QMUX_EV_QCS_BUILD_STRM,
qcc->conn, qcs, &arg);
}
return total;
err:
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
return -1;
}
/* Check after transferring data from qcs.tx.buf if FIN must be set on the next
* STREAM frame for <qcs>.
*
* Returns true if FIN must be set else false.
*/
static int qcs_stream_fin(struct qcs *qcs)
{
return qcs->flags & QC_SF_FIN_STREAM && !b_data(&qcs->tx.buf);
}
/* Return true if <qcs> has data to send in new STREAM frames. */
static forceinline int qcs_need_sending(struct qcs *qcs)
{
return b_data(&qcs->tx.buf) || qcs->tx.sent_offset < qcs->tx.offset ||
qcs_stream_fin(qcs);
}
/* This function must be called by the upper layer to inform about the sending
* of a STREAM frame for <qcs> instance. The frame is of <data> length and on
* <offset>.
*/
void qcc_streams_sent_done(struct qcs *qcs, uint64_t data, uint64_t offset)
{
struct qcc *qcc = qcs->qcc;
uint64_t diff;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
BUG_ON(offset > qcs->tx.sent_offset);
BUG_ON(offset + data > qcs->tx.offset);
/* check if the STREAM frame has already been notified. It can happen
* for retransmission.
*/
if (offset + data < qcs->tx.sent_offset) {
TRACE_DEVEL("offset already notified", QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto out;
}
qcs_idle_open(qcs);
diff = offset + data - qcs->tx.sent_offset;
if (diff) {
/* increase offset sum on connection */
qcc->tx.sent_offsets += diff;
BUG_ON_HOT(qcc->tx.sent_offsets > qcc->rfctl.md);
if (qcc->tx.sent_offsets == qcc->rfctl.md) {
qcc->flags |= QC_CF_BLK_MFCTL;
TRACE_STATE("connection flow-control reached", QMUX_EV_QCS_SEND, qcc->conn);
}
/* increase offset on stream */
qcs->tx.sent_offset += diff;
BUG_ON_HOT(qcs->tx.sent_offset > qcs->tx.msd);
BUG_ON_HOT(qcs->tx.sent_offset > qcs->tx.offset);
if (qcs->tx.sent_offset == qcs->tx.msd) {
qcs->flags |= QC_SF_BLK_SFCTL;
TRACE_STATE("stream flow-control reached", QMUX_EV_QCS_SEND, qcc->conn, qcs);
}
/* If qcs.stream.buf is full, release it to the lower layer. */
if (qcs->tx.offset == qcs->tx.sent_offset &&
b_full(&qcs->stream->buf->buf)) {
qc_stream_buf_release(qcs->stream);
}
/* Add measurement for send rate. This is done at the MUX layer
* to account only for STREAM frames without retransmission.
*/
increment_send_rate(diff, 0);
}
if (qcs->tx.offset == qcs->tx.sent_offset && !b_data(&qcs->tx.buf)) {
/* Remove stream from send_list if all was sent. */
LIST_DEL_INIT(&qcs->el_send);
TRACE_STATE("stream sent done", QMUX_EV_QCS_SEND, qcc->conn, qcs);
if (qcs->flags & (QC_SF_FIN_STREAM|QC_SF_DETACH)) {
/* Close stream locally. */
qcs_close_local(qcs);
/* Reset flag to not emit multiple FIN STREAM frames. */
qcs->flags &= ~QC_SF_FIN_STREAM;
}
}
out:
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
}
/* Returns true if subscribe set, false otherwise. */
static int qcc_subscribe_send(struct qcc *qcc)
{
struct connection *conn = qcc->conn;
/* Do not subscribe if lower layer in error. */
if (conn->flags & CO_FL_ERROR)
return 0;
if (qcc->wait_event.events & SUB_RETRY_SEND)
return 1;
TRACE_DEVEL("subscribe for send", QMUX_EV_QCC_SEND, qcc->conn);
conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &qcc->wait_event);
return 1;
}
/* Wrapper for send on transport layer. Send a list of frames <frms> for the
* connection <qcc>.
*
* Returns 0 if all data sent with success else non-zero.
*/
static int qcc_send_frames(struct qcc *qcc, struct list *frms)
{
TRACE_ENTER(QMUX_EV_QCC_SEND, qcc->conn);
if (LIST_ISEMPTY(frms)) {
TRACE_DEVEL("no frames to send", QMUX_EV_QCC_SEND, qcc->conn);
goto err;
}
if (!qc_send_mux(qcc->conn->handle.qc, frms)) {
TRACE_DEVEL("error on sending", QMUX_EV_QCC_SEND, qcc->conn);
qcc_subscribe_send(qcc);
goto err;
}
/* If there is frames left at this stage, transport layer is blocked.
* Subscribe on it to retry later.
*/
if (!LIST_ISEMPTY(frms)) {
TRACE_DEVEL("remaining frames to send", QMUX_EV_QCC_SEND, qcc->conn);
qcc_subscribe_send(qcc);
goto err;
}
TRACE_LEAVE(QMUX_EV_QCC_SEND, qcc->conn);
return 0;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCC_SEND, qcc->conn);
return 1;
}
/* Emit a RESET_STREAM on <qcs>.
*
* Returns 0 if the frame has been successfully sent else non-zero.
*/
static int qcs_send_reset(struct qcs *qcs)
{
struct list frms = LIST_HEAD_INIT(frms);
struct quic_frame *frm;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
frm = qc_frm_alloc(QUIC_FT_RESET_STREAM);
if (!frm) {
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 1;
}
frm->reset_stream.id = qcs->id;
frm->reset_stream.app_error_code = qcs->err;
frm->reset_stream.final_size = qcs->tx.sent_offset;
LIST_APPEND(&frms, &frm->list);
if (qcc_send_frames(qcs->qcc, &frms)) {
if (!LIST_ISEMPTY(&frms))
qc_frm_free(&frm);
TRACE_DEVEL("cannot send RESET_STREAM", QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 1;
}
qcs_close_local(qcs);
qcs->flags &= ~QC_SF_TO_RESET;
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 0;
}
/* Emit a STOP_SENDING on <qcs>.
*
* Returns 0 if the frame has been successfully sent else non-zero.
*/
static int qcs_send_stop_sending(struct qcs *qcs)
{
struct list frms = LIST_HEAD_INIT(frms);
struct quic_frame *frm;
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
/* RFC 9000 3.3. Permitted Frame Types
*
* A
* receiver MAY send a STOP_SENDING frame in any state where it has not
* received a RESET_STREAM frame -- that is, states other than "Reset
* Recvd" or "Reset Read". However, there is little value in sending a
* STOP_SENDING frame in the "Data Recvd" state, as all stream data has
* been received. A sender could receive either of these two types of
* frames in any state as a result of delayed delivery of packets.¶
*/
if (qcs_is_close_remote(qcs)) {
TRACE_STATE("skip STOP_SENDING on remote already closed", QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto done;
}
frm = qc_frm_alloc(QUIC_FT_STOP_SENDING);
if (!frm) {
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 1;
}
frm->stop_sending.id = qcs->id;
frm->stop_sending.app_error_code = qcs->err;
LIST_APPEND(&frms, &frm->list);
if (qcc_send_frames(qcs->qcc, &frms)) {
if (!LIST_ISEMPTY(&frms))
qc_frm_free(&frm);
TRACE_DEVEL("cannot send STOP_SENDING", QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 1;
}
done:
qcs->flags &= ~QC_SF_TO_STOP_SENDING;
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcs->qcc->conn, qcs);
return 0;
}
/* Used internally by qcc_io_send function. Proceed to send for <qcs>. This will
* transfer data from qcs buffer to its quic_stream counterpart. A STREAM frame
* is then generated and inserted in <frms> list.
*
* Returns the total bytes transferred between qcs and quic_stream buffers. Can
* be null if out buffer cannot be allocated. On error a negative error code is
* used.
*/
static int qcs_send(struct qcs *qcs, struct list *frms)
{
struct qcc *qcc = qcs->qcc;
struct buffer *buf = &qcs->tx.buf;
struct buffer *out = qc_stream_buf_get(qcs->stream);
int xfer = 0, buf_avail;
char fin = 0;
TRACE_ENTER(QMUX_EV_QCS_SEND, qcc->conn, qcs);
/* Cannot send STREAM on remote unidirectional streams. */
BUG_ON(quic_stream_is_uni(qcs->id) && quic_stream_is_remote(qcc, qcs->id));
if (b_data(buf)) {
/* Allocate <out> buffer if not already done. */
if (!out) {
if (qcc->flags & QC_CF_CONN_FULL)
goto out;
out = qc_stream_buf_alloc(qcs->stream, qcs->tx.offset,
&buf_avail);
if (!out) {
if (buf_avail) {
TRACE_ERROR("stream desc alloc failure", QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto err;
}
TRACE_STATE("hitting stream desc buffer limit", QMUX_EV_QCS_SEND, qcc->conn, qcs);
qcc->flags |= QC_CF_CONN_FULL;
goto out;
}
}
/* Transfer data from <buf> to <out>. */
xfer = qcs_xfer_data(qcs, out, buf);
if (xfer < 0)
goto err;
if (xfer > 0) {
qcs_notify_send(qcs);
qcs->flags &= ~QC_SF_BLK_MROOM;
}
qcs->tx.offset += xfer;
BUG_ON_HOT(qcs->tx.offset > qcs->tx.msd);
qcc->tx.offsets += xfer;
BUG_ON_HOT(qcc->tx.offsets > qcc->rfctl.md);
/* out buffer cannot be emptied if qcs offsets differ. */
BUG_ON(!b_data(out) && qcs->tx.sent_offset != qcs->tx.offset);
}
/* FIN is set if all incoming data were transferred. */
fin = qcs_stream_fin(qcs);
/* Build a new STREAM frame with <out> buffer. */
if (qcs->tx.sent_offset != qcs->tx.offset || fin) {
/* Skip STREAM frame allocation if already subscribed for send.
* Happens on sendto transient error or network congestion.
*/
if (qcc->wait_event.events & SUB_RETRY_SEND) {
TRACE_DEVEL("already subscribed for sending",
QMUX_EV_QCS_SEND, qcc->conn, qcs);
goto err;
}
if (qcs_build_stream_frm(qcs, out, fin, frms) < 0)
goto err;
}
out:
TRACE_LEAVE(QMUX_EV_QCS_SEND, qcc->conn, qcs);
return xfer;
err:
TRACE_DEVEL("leaving on error", QMUX_EV_QCS_SEND, qcc->conn, qcs);
return -1;
}
/* Proceed to sending. Loop through all available streams for the <qcc>
* instance and try to send as much as possible.
*
* Returns the total of bytes sent to the transport layer.
*/
static int qcc_io_send(struct qcc *qcc)
{
struct list frms = LIST_HEAD_INIT(frms);
/* Temporary list for QCS on error. */
struct list qcs_failed = LIST_HEAD_INIT(qcs_failed);
struct qcs *qcs, *qcs_tmp, *first_qcs = NULL;
int ret, total = 0;
TRACE_ENTER(QMUX_EV_QCC_SEND, qcc->conn);
/* TODO if socket in transient error, sending should be temporarily
* disabled for all frames. However, checking for send subscription is
* not valid as this may be caused by a congestion error which only
* apply for STREAM frames.
*/
/* Check for transport error. */
if (qcc->flags & QC_CF_ERR_CONN || qcc->conn->flags & CO_FL_ERROR) {
TRACE_DEVEL("connection on error", QMUX_EV_QCC_SEND, qcc->conn);
goto out;
}
/* Check for locally detected connection error. */
if (qcc->flags & QC_CF_ERRL) {
/* Prepare a CONNECTION_CLOSE if not already done. */
if (!(qcc->flags & QC_CF_ERRL_DONE)) {
TRACE_DATA("report a connection error", QMUX_EV_QCC_SEND|QMUX_EV_QCC_ERR, qcc->conn);
quic_set_connection_close(qcc->conn->handle.qc, qcc->err);
qcc->flags |= QC_CF_ERRL_DONE;
}
goto out;
}
if (qcc->conn->flags & CO_FL_SOCK_WR_SH) {
qcc->conn->flags |= CO_FL_ERROR;
TRACE_DEVEL("connection on error", QMUX_EV_QCC_SEND, qcc->conn);
goto out;
}
if (!LIST_ISEMPTY(&qcc->lfctl.frms)) {
if (qcc_send_frames(qcc, &qcc->lfctl.frms)) {
TRACE_DEVEL("flow-control frames rejected by transport, aborting send", QMUX_EV_QCC_SEND, qcc->conn);
goto out;
}
}
/* Send STREAM/STOP_SENDING/RESET_STREAM data for registered streams. */
list_for_each_entry_safe(qcs, qcs_tmp, &qcc->send_list, el_send) {
/* Check if all QCS were processed. */
if (qcs == first_qcs)
break;
/* Stream must not be present in send_list if it has nothing to send. */
BUG_ON(!(qcs->flags & (QC_SF_TO_STOP_SENDING|QC_SF_TO_RESET)) &&
!qcs_need_sending(qcs));
/* Each STOP_SENDING/RESET_STREAM frame is sent individually to
* guarantee its emission.
*
* TODO multiplex several frames in same datagram to optimize sending
*/
if (qcs->flags & QC_SF_TO_STOP_SENDING) {
if (qcs_send_stop_sending(qcs))
goto sent_done;
/* Remove stream from send_list if it had only STOP_SENDING
* to send.
*/
if (!(qcs->flags & QC_SF_TO_RESET) && !qcs_need_sending(qcs)) {
LIST_DEL_INIT(&qcs->el_send);
continue;
}
}
if (qcs->flags & QC_SF_TO_RESET) {
if (qcs_send_reset(qcs))
goto sent_done;
/* RFC 9000 3.3. Permitted Frame Types
*
* A sender MUST NOT send
* a STREAM or STREAM_DATA_BLOCKED frame for a stream in the
* "Reset Sent" state or any terminal state -- that is, after
* sending a RESET_STREAM frame.
*/
LIST_DEL_INIT(&qcs->el_send);
continue;
}
if (!(qcc->flags & QC_CF_BLK_MFCTL) &&
!(qcs->flags & QC_SF_BLK_SFCTL)) {
if ((ret = qcs_send(qcs, &frms)) < 0) {
/* Temporarily remove QCS from send-list. */
LIST_DEL_INIT(&qcs->el_send);
LIST_APPEND(&qcs_failed, &qcs->el_send);
continue;
}
total += ret;
if (ret) {
/* Move QCS with some bytes transferred at the
* end of send-list for next iterations.
*/
LIST_DEL_INIT(&qcs->el_send);
LIST_APPEND(&qcc->send_list, &qcs->el_send);
/* Remember first moved QCS as checkpoint to interrupt loop */
if (!first_qcs)
first_qcs = qcs;
}
}
}
/* Retry sending until no frame to send, data rejected or connection
* flow-control limit reached.
*/
while (qcc_send_frames(qcc, &frms) == 0 && !(qcc->flags & QC_CF_BLK_MFCTL)) {
/* Reloop over <qcc.send_list>. Useful for streams which have
* fulfilled their qc_stream_desc buf and have now release it.
*/
list_for_each_entry_safe(qcs, qcs_tmp, &qcc->send_list, el_send) {
/* Only streams blocked on flow-control or waiting on a
* new qc_stream_desc should be present in send_list as
* long as transport layer can handle all data.
*/
BUG_ON(qcs->stream->buf && !(qcs->flags & QC_SF_BLK_SFCTL));
if (!(qcs->flags & QC_SF_BLK_SFCTL)) {
if ((ret = qcs_send(qcs, &frms)) < 0) {
LIST_DEL_INIT(&qcs->el_send);
LIST_APPEND(&qcs_failed, &qcs->el_send);
continue;
}
total += ret;
}
}
}
sent_done:
/* Deallocate frames that the transport layer has rejected. */
if (!LIST_ISEMPTY(&frms)) {
struct quic_frame *frm, *frm2;
list_for_each_entry_safe(frm, frm2, &frms, list)
qc_frm_free(&frm);
}
/* Re-insert on-error QCS at the end of the send-list. */
if (!LIST_ISEMPTY(&qcs_failed)) {
list_for_each_entry_safe(qcs, qcs_tmp, &qcs_failed, el_send) {
LIST_DEL_INIT(&qcs->el_send);
LIST_APPEND(&qcc->send_list, &qcs->el_send);
}
if (!(qcc->flags & QC_CF_BLK_MFCTL))
tasklet_wakeup(qcc->wait_event.tasklet);
}
out:
if (qcc->conn->flags & CO_FL_ERROR && !(qcc->flags & QC_CF_ERR_CONN)) {
TRACE_ERROR("error reported by transport layer",
QMUX_EV_QCC_SEND, qcc->conn);
qcc->flags |= QC_CF_ERR_CONN;
}
TRACE_LEAVE(QMUX_EV_QCC_SEND, qcc->conn);
return total;
}
/* Proceed on receiving. Loop through all streams from <qcc> and use decode_qcs
* operation.
*
* Returns 0 on success else non-zero.
*/
static int qcc_io_recv(struct qcc *qcc)
{
struct eb64_node *node;
struct qcs *qcs;
TRACE_ENTER(QMUX_EV_QCC_RECV, qcc->conn);
if (qcc->flags & QC_CF_ERRL) {
TRACE_DATA("connection on error", QMUX_EV_QCC_RECV, qcc->conn);
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
}
node = eb64_first(&qcc->streams_by_id);
while (node) {
uint64_t id;
qcs = eb64_entry(node, struct qcs, by_id);
id = qcs->id;
if (!ncb_data(&qcs->rx.ncbuf, 0) || (qcs->flags & QC_SF_DEM_FULL)) {
node = eb64_next(node);
continue;
}
if (quic_stream_is_uni(id) && quic_stream_is_local(qcc, id)) {
node = eb64_next(node);
continue;
}
qcc_decode_qcs(qcc, qcs);
node = eb64_next(node);
}
TRACE_LEAVE(QMUX_EV_QCC_RECV, qcc->conn);
return 0;
}
/* Release all streams which have their transfer operation achieved.
*
* Returns true if at least one stream is released.
*/
static int qcc_purge_streams(struct qcc *qcc)
{
struct eb64_node *node;
int release = 0;
TRACE_ENTER(QMUX_EV_QCC_WAKE, qcc->conn);
node = eb64_first(&qcc->streams_by_id);
while (node) {
struct qcs *qcs = eb64_entry(node, struct qcs, by_id);
node = eb64_next(node);
/* Release not attached closed streams. */
if (qcs->st == QC_SS_CLO && !qcs_sc(qcs)) {
TRACE_STATE("purging closed stream", QMUX_EV_QCC_WAKE, qcs->qcc->conn, qcs);
qcs_destroy(qcs);
release = 1;
continue;
}
/* Release detached streams with empty buffer. */
if (qcs->flags & QC_SF_DETACH) {
if (qcs_is_close_local(qcs)) {
TRACE_STATE("purging detached stream", QMUX_EV_QCC_WAKE, qcs->qcc->conn, qcs);
qcs_destroy(qcs);
release = 1;
continue;
}
}
}
TRACE_LEAVE(QMUX_EV_QCC_WAKE, qcc->conn);
return release;
}
/* Execute application layer shutdown. If this operation is not defined, a
* CONNECTION_CLOSE will be prepared as a fallback. This function is protected
* against multiple invocation with the flag QC_CF_APP_SHUT.
*/
static void qcc_shutdown(struct qcc *qcc)
{
TRACE_ENTER(QMUX_EV_QCC_END, qcc->conn);
if (qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL)) {
TRACE_DATA("connection on error", QMUX_EV_QCC_END, qcc->conn);
goto out;
}
if (qcc->flags & QC_CF_APP_SHUT)
goto out;
TRACE_STATE("perform graceful shutdown", QMUX_EV_QCC_END, qcc->conn);
if (qcc->app_ops && qcc->app_ops->shutdown) {
qcc->app_ops->shutdown(qcc->ctx);
qcc_io_send(qcc);
}
else {
qcc->err = quic_err_transport(QC_ERR_NO_ERROR);
}
/* Register "no error" code at transport layer. Do not use
* quic_set_connection_close() as retransmission may be performed to
* finalized transfers. Do not overwrite quic-conn existing code if
* already set.
*
* TODO implement a wrapper function for this in quic-conn module
*/
if (!(qcc->conn->handle.qc->flags & QUIC_FL_CONN_IMMEDIATE_CLOSE))
qcc->conn->handle.qc->err = qcc->err;
out:
qcc->flags |= QC_CF_APP_SHUT;
TRACE_LEAVE(QMUX_EV_QCC_END, qcc->conn);
}
/* Loop through all qcs from <qcc>. Report error on stream endpoint if
* connection on error and wake them.
*/
static int qcc_wake_some_streams(struct qcc *qcc)
{
struct qcs *qcs;
struct eb64_node *node;
TRACE_POINT(QMUX_EV_QCC_WAKE, qcc->conn);
for (node = eb64_first(&qcc->streams_by_id); node;
node = eb64_next(node)) {
qcs = eb64_entry(node, struct qcs, by_id);
if (!qcs_sc(qcs))
continue;
if (qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL)) {
TRACE_POINT(QMUX_EV_QCC_WAKE, qcc->conn, qcs);
se_fl_set_error(qcs->sd);
qcs_alert(qcs);
}
}
return 0;
}
/* Conduct operations which should be made for <qcc> connection after
* input/output. Most notably, closed streams are purged which may leave the
* connection has ready to be released.
*
* Returns 1 if <qcc> must be released else 0.
*/
static int qcc_io_process(struct qcc *qcc)
{
qcc_purge_streams(qcc);
/* Check if a soft-stop is in progress.
*
* TODO this is relevant for frontend connections only.
*/
if (unlikely(qcc->proxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED))) {
int close = 1;
/* If using listener socket, soft-stop is not supported. The
* connection must be closed immediately.
*/
if (!qc_test_fd(qcc->conn->handle.qc)) {
TRACE_DEVEL("proxy disabled with listener socket, closing connection", QMUX_EV_QCC_WAKE, qcc->conn);
qcc->conn->flags |= (CO_FL_SOCK_RD_SH|CO_FL_SOCK_WR_SH);
qcc_io_send(qcc);
goto out;
}
TRACE_DEVEL("proxy disabled, prepare connection soft-stop", QMUX_EV_QCC_WAKE, qcc->conn);
/* If a close-spread-time option is set, we want to avoid
* closing all the active HTTP3 connections at once so we add a
* random factor that will spread the closing.
*/
if (tick_isset(global.close_spread_end)) {
int remaining_window = tick_remain(now_ms, global.close_spread_end);
if (remaining_window) {
/* This should increase the closing rate the
* further along the window we are. */
close = (remaining_window <= statistical_prng_range(global.close_spread_time));
}
}
else if (global.tune.options & GTUNE_DISABLE_ACTIVE_CLOSE) {
close = 0; /* let the client close his connection himself */
}
if (close)
qcc_shutdown(qcc);
}
/* Report error if set on stream endpoint layer. */
if (qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL))
qcc_wake_some_streams(qcc);
out:
if (qcc_is_dead(qcc))
return 1;
return 0;
}
/* release function. This one should be called to free all resources allocated
* to the mux.
*/
static void qcc_release(struct qcc *qcc)
{
struct connection *conn = qcc->conn;
struct eb64_node *node;
TRACE_ENTER(QMUX_EV_QCC_END, conn);
qcc_shutdown(qcc);
if (qcc->task) {
task_destroy(qcc->task);
qcc->task = NULL;
}
/* liberate remaining qcs instances */
node = eb64_first(&qcc->streams_by_id);
while (node) {
struct qcs *qcs = eb64_entry(node, struct qcs, by_id);
node = eb64_next(node);
qcs_free(qcs);
}
tasklet_free(qcc->wait_event.tasklet);
if (conn && qcc->wait_event.events) {
conn->xprt->unsubscribe(conn, conn->xprt_ctx,
qcc->wait_event.events,
&qcc->wait_event);
}
while (!LIST_ISEMPTY(&qcc->lfctl.frms)) {
struct quic_frame *frm = LIST_ELEM(qcc->lfctl.frms.n, struct quic_frame *, list);
qc_frm_free(&frm);
}
if (qcc->app_ops && qcc->app_ops->release)
qcc->app_ops->release(qcc->ctx);
TRACE_PROTO("application layer released", QMUX_EV_QCC_END, conn);
pool_free(pool_head_qcc, qcc);
if (conn) {
LIST_DEL_INIT(&conn->stopping_list);
conn->handle.qc->conn = NULL;
conn->mux = NULL;
conn->ctx = NULL;
TRACE_DEVEL("freeing conn", QMUX_EV_QCC_END, conn);
conn_stop_tracking(conn);
conn_full_close(conn);
if (conn->destroy_cb)
conn->destroy_cb(conn);
conn_free(conn);
}
TRACE_LEAVE(QMUX_EV_QCC_END);
}
struct task *qcc_io_cb(struct task *t, void *ctx, unsigned int status)
{
struct qcc *qcc = ctx;
TRACE_ENTER(QMUX_EV_QCC_WAKE, qcc->conn);
qcc_io_send(qcc);
qcc_io_recv(qcc);
if (qcc_io_process(qcc)) {
TRACE_STATE("releasing dead connection", QMUX_EV_QCC_WAKE, qcc->conn);
goto release;
}
qcc_refresh_timeout(qcc);
end:
TRACE_LEAVE(QMUX_EV_QCC_WAKE, qcc->conn);
return NULL;
release:
qcc_release(qcc);
TRACE_LEAVE(QMUX_EV_QCC_WAKE);
return NULL;
}
static struct task *qcc_timeout_task(struct task *t, void *ctx, unsigned int state)
{
struct qcc *qcc = ctx;
int expired = tick_is_expired(t->expire, now_ms);
TRACE_ENTER(QMUX_EV_QCC_WAKE, qcc ? qcc->conn : NULL);
if (qcc) {
if (!expired) {
TRACE_DEVEL("not expired", QMUX_EV_QCC_WAKE, qcc->conn);
goto requeue;
}
if (!qcc_may_expire(qcc)) {
TRACE_DEVEL("cannot expired", QMUX_EV_QCC_WAKE, qcc->conn);
t->expire = TICK_ETERNITY;
goto requeue;
}
}
task_destroy(t);
if (!qcc) {
TRACE_DEVEL("no more qcc", QMUX_EV_QCC_WAKE);
goto out;
}
/* Mark timeout as triggered by setting task to NULL. */
qcc->task = NULL;
/* TODO depending on the timeout condition, different shutdown mode
* should be used. For http keep-alive or disabled proxy, a graceful
* shutdown should occurs. For all other cases, an immediate close
* seems legitimate.
*/
if (qcc_is_dead(qcc)) {
TRACE_STATE("releasing dead connection", QMUX_EV_QCC_WAKE, qcc->conn);
qcc_release(qcc);
}
out:
TRACE_LEAVE(QMUX_EV_QCC_WAKE);
return NULL;
requeue:
TRACE_LEAVE(QMUX_EV_QCC_WAKE);
return t;
}
static int qmux_init(struct connection *conn, struct proxy *prx,
struct session *sess, struct buffer *input)
{
struct qcc *qcc;
struct quic_transport_params *lparams, *rparams;
TRACE_ENTER(QMUX_EV_QCC_NEW);
qcc = pool_alloc(pool_head_qcc);
if (!qcc) {
TRACE_ERROR("alloc failure", QMUX_EV_QCC_NEW);
goto fail_no_qcc;
}
qcc->conn = conn;
conn->ctx = qcc;
qcc->nb_hreq = qcc->nb_sc = 0;
qcc->flags = 0;
qcc->app_ops = NULL;
qcc->streams_by_id = EB_ROOT_UNIQUE;
/* Server parameters, params used for RX flow control. */
lparams = &conn->handle.qc->rx.params;
qcc->tx.sent_offsets = qcc->tx.offsets = 0;
LIST_INIT(&qcc->lfctl.frms);
qcc->lfctl.ms_bidi = qcc->lfctl.ms_bidi_init = lparams->initial_max_streams_bidi;
qcc->lfctl.ms_uni = lparams->initial_max_streams_uni;
qcc->lfctl.msd_bidi_l = lparams->initial_max_stream_data_bidi_local;
qcc->lfctl.msd_bidi_r = lparams->initial_max_stream_data_bidi_remote;
qcc->lfctl.msd_uni_r = lparams->initial_max_stream_data_uni;
qcc->lfctl.cl_bidi_r = 0;
qcc->lfctl.md = qcc->lfctl.md_init = lparams->initial_max_data;
qcc->lfctl.offsets_recv = qcc->lfctl.offsets_consume = 0;
rparams = &conn->handle.qc->tx.params;
qcc->rfctl.md = rparams->initial_max_data;
qcc->rfctl.msd_bidi_l = rparams->initial_max_stream_data_bidi_local;
qcc->rfctl.msd_bidi_r = rparams->initial_max_stream_data_bidi_remote;
qcc->rfctl.msd_uni_l = rparams->initial_max_stream_data_uni;
if (conn_is_back(conn)) {
qcc->next_bidi_l = 0x00;
qcc->largest_bidi_r = 0x01;
qcc->next_uni_l = 0x02;
qcc->largest_uni_r = 0x03;
}
else {
qcc->largest_bidi_r = 0x00;
qcc->next_bidi_l = 0x01;
qcc->largest_uni_r = 0x02;
qcc->next_uni_l = 0x03;
}
qcc->wait_event.tasklet = tasklet_new();
if (!qcc->wait_event.tasklet) {
TRACE_ERROR("taslket alloc failure", QMUX_EV_QCC_NEW);
goto fail_no_tasklet;
}
LIST_INIT(&qcc->send_list);
qcc->wait_event.tasklet->process = qcc_io_cb;
qcc->wait_event.tasklet->context = qcc;
qcc->wait_event.events = 0;
qcc->proxy = prx;
/* haproxy timeouts */
if (conn_is_back(qcc->conn)) {
qcc->timeout = prx->timeout.server;
qcc->shut_timeout = tick_isset(prx->timeout.serverfin) ?
prx->timeout.serverfin : prx->timeout.server;
}
else {
qcc->timeout = prx->timeout.client;
qcc->shut_timeout = tick_isset(prx->timeout.clientfin) ?
prx->timeout.clientfin : prx->timeout.client;
}
/* Always allocate task even if timeout is unset. In MUX code, if task
* is NULL, it indicates that a timeout has stroke earlier.
*/
qcc->task = task_new_here();
if (!qcc->task) {
TRACE_ERROR("timeout task alloc failure", QMUX_EV_QCC_NEW);
goto fail_no_timeout_task;
}
qcc->task->process = qcc_timeout_task;
qcc->task->context = qcc;
qcc->task->expire = tick_add_ifset(now_ms, qcc->timeout);
qcc_reset_idle_start(qcc);
LIST_INIT(&qcc->opening_list);
HA_ATOMIC_STORE(&conn->handle.qc->qcc, qcc);
if (qcc_install_app_ops(qcc, conn->handle.qc->app_ops)) {
TRACE_PROTO("Cannot install app layer", QMUX_EV_QCC_NEW|QMUX_EV_QCC_ERR, qcc->conn);
/* prepare a CONNECTION_CLOSE frame */
quic_set_connection_close(conn->handle.qc, quic_err_transport(QC_ERR_APPLICATION_ERROR));
goto fail_install_app_ops;
}
if (qcc->app_ops == &h3_ops)
proxy_inc_fe_cum_sess_ver_ctr(sess->listener, prx, 3);
/* Register conn for idle front closing. This is done once everything is allocated. */
if (!conn_is_back(conn))
LIST_APPEND(&mux_stopping_data[tid].list, &conn->stopping_list);
/* init read cycle */
tasklet_wakeup(qcc->wait_event.tasklet);
TRACE_LEAVE(QMUX_EV_QCC_NEW, qcc->conn);
return 0;
fail_install_app_ops:
if (qcc->app_ops && qcc->app_ops->release)
qcc->app_ops->release(qcc->ctx);
task_destroy(qcc->task);
fail_no_timeout_task:
tasklet_free(qcc->wait_event.tasklet);
fail_no_tasklet:
pool_free(pool_head_qcc, qcc);
fail_no_qcc:
TRACE_LEAVE(QMUX_EV_QCC_NEW);
return -1;
}
static void qmux_destroy(void *ctx)
{
struct qcc *qcc = ctx;
TRACE_ENTER(QMUX_EV_QCC_END, qcc->conn);
qcc_release(qcc);
TRACE_LEAVE(QMUX_EV_QCC_END);
}
static void qmux_strm_detach(struct sedesc *sd)
{
struct qcs *qcs = sd->se;
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_STRM_END, qcc->conn, qcs);
/* TODO this BUG_ON_HOT() is not correct as the stconn layer may detach
* from the stream even if it is not closed remotely at the QUIC layer.
* This happens for example when a stream must be closed due to a
* rejected request. To better handle these cases, it will be required
* to implement shutr/shutw MUX operations. Once this is done, this
* BUG_ON_HOT() statement can be adjusted.
*/
//BUG_ON_HOT(!qcs_is_close_remote(qcs));
qcc_rm_sc(qcc);
if (!qcs_is_close_local(qcs) &&
!(qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL))) {
TRACE_STATE("remaining data, detaching qcs", QMUX_EV_STRM_END, qcc->conn, qcs);
qcs->flags |= QC_SF_DETACH;
qcc_refresh_timeout(qcc);
TRACE_LEAVE(QMUX_EV_STRM_END, qcc->conn, qcs);
return;
}
qcs_destroy(qcs);
if (qcc_is_dead(qcc)) {
TRACE_STATE("killing dead connection", QMUX_EV_STRM_END, qcc->conn);
goto release;
}
else {
TRACE_DEVEL("refreshing connection's timeout", QMUX_EV_STRM_END, qcc->conn);
qcc_refresh_timeout(qcc);
}
TRACE_LEAVE(QMUX_EV_STRM_END, qcc->conn);
return;
release:
qcc_release(qcc);
TRACE_LEAVE(QMUX_EV_STRM_END);
return;
}
/* Called from the upper layer, to receive data */
static size_t qmux_strm_rcv_buf(struct stconn *sc, struct buffer *buf,
size_t count, int flags)
{
struct qcs *qcs = __sc_mux_strm(sc);
struct qcc *qcc = qcs->qcc;
size_t ret = 0;
char fin = 0;
TRACE_ENTER(QMUX_EV_STRM_RECV, qcc->conn, qcs);
ret = qcs_http_rcv_buf(qcs, buf, count, &fin);
if (b_data(&qcs->rx.app_buf)) {
se_fl_set(qcs->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM);
}
else {
se_fl_clr(qcs->sd, SE_FL_RCV_MORE | SE_FL_WANT_ROOM);
/* Set end-of-input when full message properly received. */
if (fin) {
TRACE_STATE("report end-of-input", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set(qcs->sd, SE_FL_EOI);
/* If request EOM is reported to the upper layer, it means the
* QCS now expects data from the opposite side.
*/
se_expect_data(qcs->sd);
}
/* Set end-of-stream on read closed. */
if (qcs->flags & QC_SF_RECV_RESET ||
qcc->conn->flags & CO_FL_SOCK_RD_SH) {
TRACE_STATE("report end-of-stream", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set(qcs->sd, SE_FL_EOS);
/* Set error if EOI not reached. This may happen on
* RESET_STREAM reception or connection error.
*/
if (!se_fl_test(qcs->sd, SE_FL_EOI)) {
TRACE_STATE("report error on stream aborted", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set(qcs->sd, SE_FL_ERROR);
}
}
if (se_fl_test(qcs->sd, SE_FL_ERR_PENDING)) {
TRACE_STATE("report error", QMUX_EV_STRM_RECV, qcc->conn, qcs);
se_fl_set(qcs->sd, SE_FL_ERROR);
}
if (b_size(&qcs->rx.app_buf)) {
b_free(&qcs->rx.app_buf);
offer_buffers(NULL, 1);
}
}
/* Restart demux if it was interrupted on full buffer. */
if (ret && qcs->flags & QC_SF_DEM_FULL) {
/* Ensure DEM_FULL is only set if there is available data to
* ensure we never do unnecessary wakeup here.
*/
BUG_ON(!ncb_data(&qcs->rx.ncbuf, 0));
qcs->flags &= ~QC_SF_DEM_FULL;
if (!(qcc->flags & QC_CF_ERRL))
tasklet_wakeup(qcc->wait_event.tasklet);
}
TRACE_LEAVE(QMUX_EV_STRM_RECV, qcc->conn, qcs);
return ret;
}
static size_t qmux_strm_snd_buf(struct stconn *sc, struct buffer *buf,
size_t count, int flags)
{
struct qcs *qcs = __sc_mux_strm(sc);
size_t ret = 0;
char fin;
TRACE_ENTER(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
/* stream layer has been detached so no transfer must occur after. */
BUG_ON_HOT(qcs->flags & QC_SF_DETACH);
/* Report error if set on stream endpoint layer. */
if (qcs->qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL)) {
se_fl_set(qcs->sd, SE_FL_ERROR);
TRACE_DEVEL("connection in error", QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
goto end;
}
if (qcs_is_close_local(qcs) || (qcs->flags & QC_SF_TO_RESET)) {
ret = qcs_http_reset_buf(qcs, buf, count);
goto end;
}
ret = qcs_http_snd_buf(qcs, buf, count, &fin);
if (fin) {
TRACE_STATE("reached stream fin", QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
qcs->flags |= QC_SF_FIN_STREAM;
}
if (ret || fin) {
qcc_send_stream(qcs, 0);
if (!(qcs->qcc->wait_event.events & SUB_RETRY_SEND))
tasklet_wakeup(qcs->qcc->wait_event.tasklet);
}
end:
TRACE_LEAVE(QMUX_EV_STRM_SEND, qcs->qcc->conn, qcs);
return ret;
}
/* Called from the upper layer, to subscribe <es> to events <event_type>. The
* event subscriber <es> is not allowed to change from a previous call as long
* as at least one event is still subscribed. The <event_type> must only be a
* combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
*/
static int qmux_strm_subscribe(struct stconn *sc, int event_type,
struct wait_event *es)
{
return qcs_subscribe(__sc_mux_strm(sc), event_type, es);
}
/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
* The <es> pointer is not allowed to differ from the one passed to the
* subscribe() call. It always returns zero.
*/
static int qmux_strm_unsubscribe(struct stconn *sc, int event_type, struct wait_event *es)
{
struct qcs *qcs = __sc_mux_strm(sc);
BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
BUG_ON(qcs->subs && qcs->subs != es);
es->events &= ~event_type;
if (!es->events)
qcs->subs = NULL;
return 0;
}
static int qmux_wake(struct connection *conn)
{
struct qcc *qcc = conn->ctx;
TRACE_ENTER(QMUX_EV_QCC_WAKE, conn);
if (qcc_io_process(qcc)) {
TRACE_STATE("releasing dead connection", QMUX_EV_QCC_WAKE, qcc->conn);
goto release;
}
qcc_wake_some_streams(qcc);
qcc_refresh_timeout(qcc);
TRACE_LEAVE(QMUX_EV_QCC_WAKE, conn);
return 0;
release:
qcc_release(qcc);
TRACE_LEAVE(QMUX_EV_QCC_WAKE);
return 1;
}
static void qmux_strm_shutw(struct stconn *sc, enum co_shw_mode mode)
{
struct qcs *qcs = __sc_mux_strm(sc);
struct qcc *qcc = qcs->qcc;
TRACE_ENTER(QMUX_EV_STRM_SHUT, qcc->conn, qcs);
/* Early closure reported if QC_SF_FIN_STREAM not yet set. */
if (!qcs_is_close_local(qcs) &&
!(qcs->flags & (QC_SF_FIN_STREAM|QC_SF_TO_RESET))) {
if (qcs->flags & QC_SF_UNKNOWN_PL_LENGTH) {
/* Close stream with a FIN STREAM frame. */
if (!(qcc->flags & (QC_CF_ERR_CONN|QC_CF_ERRL))) {
TRACE_STATE("set FIN STREAM",
QMUX_EV_STRM_SHUT, qcc->conn, qcs);
qcs->flags |= QC_SF_FIN_STREAM;
qcc_send_stream(qcs, 0);
}
}
else {
/* RESET_STREAM necessary. */
qcc_reset_stream(qcs, 0);
}
tasklet_wakeup(qcc->wait_event.tasklet);
}
out:
TRACE_LEAVE(QMUX_EV_STRM_SHUT, qcc->conn, qcs);
}
/* for debugging with CLI's "show sess" command. May emit multiple lines, each
* new one being prefixed with <pfx>, if <pfx> is not NULL, otherwise a single
* line is used. Each field starts with a space so it's safe to print it after
* existing fields.
*/
static int qmux_strm_show_sd(struct buffer *msg, struct sedesc *sd, const char *pfx)
{
struct qcs *qcs = sd->se;
struct qcc *qcc;
int ret = 0;
if (!qcs)
return ret;
chunk_appendf(msg, " qcs=%p .flg=%#x .id=%llu .st=%s .ctx=%p, .err=%#llx",
qcs, qcs->flags, (ull)qcs->id, qcs_st_to_str(qcs->st), qcs->ctx, (ull)qcs->err);
if (pfx)
chunk_appendf(msg, "\n%s", pfx);
qcc = qcs->qcc;
chunk_appendf(msg, " qcc=%p .flg=%#x .nbsc=%llu .nbhreq=%llu, .task=%p",
qcc, qcc->flags, (ull)qcc->nb_sc, (ull)qcc->nb_hreq, qcc->task);
return ret;
}
static const struct mux_ops qmux_ops = {
.init = qmux_init,
.destroy = qmux_destroy,
.detach = qmux_strm_detach,
.rcv_buf = qmux_strm_rcv_buf,
.snd_buf = qmux_strm_snd_buf,
.subscribe = qmux_strm_subscribe,
.unsubscribe = qmux_strm_unsubscribe,
.wake = qmux_wake,
.shutw = qmux_strm_shutw,
.show_sd = qmux_strm_show_sd,
.flags = MX_FL_HTX|MX_FL_NO_UPG|MX_FL_FRAMED,
.name = "QUIC",
};
static struct mux_proto_list mux_proto_quic =
{ .token = IST("quic"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_FE, .mux = &qmux_ops };
INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_quic);