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litespeed-quic/src/liblsquic/lsquic_engine.c

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/* Copyright (c) 2017 LiteSpeed Technologies Inc. See LICENSE. */
/*
* lsquic_engine.c - QUIC engine
*/
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <time.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#ifndef NDEBUG
#include <sys/types.h>
#include <regex.h> /* For code that loses packets */
#endif
#include "lsquic.h"
#include "lsquic_types.h"
#include "lsquic_alarmset.h"
#include "lsquic_parse.h"
#include "lsquic_packet_in.h"
#include "lsquic_packet_out.h"
#include "lsquic_senhist.h"
#include "lsquic_rtt.h"
#include "lsquic_cubic.h"
#include "lsquic_pacer.h"
#include "lsquic_send_ctl.h"
#include "lsquic_set.h"
#include "lsquic_conn_flow.h"
#include "lsquic_sfcw.h"
#include "lsquic_stream.h"
#include "lsquic_conn.h"
#include "lsquic_full_conn.h"
#include "lsquic_util.h"
#include "lsquic_qtags.h"
#include "lsquic_handshake.h"
#include "lsquic_mm.h"
#include "lsquic_conn_hash.h"
#include "lsquic_engine_public.h"
#include "lsquic_eng_hist.h"
#include "lsquic_ev_log.h"
#include "lsquic_version.h"
#include "lsquic_attq.h"
#define LSQUIC_LOGGER_MODULE LSQLM_ENGINE
#include "lsquic_logger.h"
/* The batch of outgoing packets grows and shrinks dynamically */
#define MAX_OUT_BATCH_SIZE 1024
#define MIN_OUT_BATCH_SIZE 256
#define INITIAL_OUT_BATCH_SIZE 512
typedef struct lsquic_conn * (*conn_iter_f)(struct lsquic_engine *);
static void
process_connections (struct lsquic_engine *engine, conn_iter_f iter);
static void
engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag);
static lsquic_conn_t *
engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn,
enum lsquic_conn_flags flag);
static void
force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn);
/* Nested calls to LSQUIC are not supported */
#define ENGINE_IN(e) do { \
assert(!((e)->pub.enp_flags & ENPUB_PROC)); \
(e)->pub.enp_flags |= ENPUB_PROC; \
} while (0)
#define ENGINE_OUT(e) do { \
assert((e)->pub.enp_flags & ENPUB_PROC); \
(e)->pub.enp_flags &= ~ENPUB_PROC; \
} while (0)
/* A connection can be referenced from one of six places:
*
* 1. Connection hash: a connection starts its life in one of those.
*
* 2. Outgoing queue.
*
* 3. Incoming queue.
*
* 4. Pending RW Events queue.
*
* 5. Advisory Tick Time queue.
*
* 6. Closing connections queue. This is a transient queue -- it only
* exists for the duration of process_connections() function call.
*
* The idea is to destroy the connection when it is no longer referenced.
* For example, a connection tick may return TICK_SEND|TICK_CLOSE. In
* that case, the connection is referenced from two places: (2) and (6).
* After its packets are sent, it is only referenced in (6), and at the
* end of the function call, when it is removed from (6), reference count
* goes to zero and the connection is destroyed. If not all packets can
* be sent, at the end of the function call, the connection is referenced
* by (2) and will only be removed once all outgoing packets have been
* sent.
*/
#define CONN_REF_FLAGS (LSCONN_HASHED \
|LSCONN_HAS_OUTGOING \
|LSCONN_HAS_INCOMING \
|LSCONN_RW_PENDING \
|LSCONN_CLOSING \
|LSCONN_ATTQ)
struct out_heap_elem
{
struct lsquic_conn *ohe_conn;
lsquic_time_t ohe_last_sent;
};
struct out_heap
{
struct out_heap_elem *oh_elems;
unsigned oh_nalloc,
oh_nelem;
};
struct lsquic_engine
{
struct lsquic_engine_public pub;
enum {
ENG_SERVER = LSENG_SERVER,
ENG_HTTP = LSENG_HTTP,
ENG_COOLDOWN = (1 << 7), /* Cooldown: no new connections */
ENG_PAST_DEADLINE
= (1 << 8), /* Previous call to a processing
* function went past time threshold.
*/
#ifndef NDEBUG
ENG_DTOR = (1 << 26), /* Engine destructor */
#endif
} flags;
const struct lsquic_stream_if *stream_if;
void *stream_if_ctx;
lsquic_packets_out_f packets_out;
void *packets_out_ctx;
void *bad_handshake_ctx;
struct conn_hash full_conns;
TAILQ_HEAD(, lsquic_conn) conns_in, conns_pend_rw;
struct out_heap conns_out;
/* Use a union because only one iterator is being used at any one time */
union {
struct {
/* This iterator does not have any state: it uses `conns_in' */
} conn_in;
struct {
/* This iterator does not have any state: it uses `conns_pend_rw' */
} rw_pend;
struct {
/* Iterator state to process connections in Advisory Tick Time
* queue.
*/
lsquic_time_t cutoff;
} attq;
struct {
/* Iterator state to process all connections */
} all;
struct {
lsquic_conn_t *conn;
} one;
} iter_state;
struct eng_hist history;
unsigned batch_size;
unsigned time_until_desired_tick;
struct attq *attq;
lsquic_time_t proc_time;
/* Track time last time a packet was sent to give new connections
* priority lower than that of existing connections.
*/
lsquic_time_t last_sent;
lsquic_time_t deadline;
};
#define OHE_PARENT(i) ((i - 1) / 2)
#define OHE_LCHILD(i) (2 * i + 1)
#define OHE_RCHILD(i) (2 * i + 2)
static void
heapify_out_heap (struct out_heap *heap, unsigned i)
{
struct out_heap_elem el;
unsigned smallest;
assert(i < heap->oh_nelem);
if (OHE_LCHILD(i) < heap->oh_nelem)
{
if (heap->oh_elems[ OHE_LCHILD(i) ].ohe_last_sent <
heap->oh_elems[ i ].ohe_last_sent)
smallest = OHE_LCHILD(i);
else
smallest = i;
if (OHE_RCHILD(i) < heap->oh_nelem &&
heap->oh_elems[ OHE_RCHILD(i) ].ohe_last_sent <
heap->oh_elems[ smallest ].ohe_last_sent)
smallest = OHE_RCHILD(i);
}
else
smallest = i;
if (smallest != i)
{
el = heap->oh_elems[ smallest ];
heap->oh_elems[ smallest ] = heap->oh_elems[ i ];
heap->oh_elems[ i ] = el;
heapify_out_heap(heap, smallest);
}
}
static void
oh_insert (struct out_heap *heap, lsquic_conn_t *conn)
{
struct out_heap_elem el;
unsigned nalloc, i;
if (heap->oh_nelem == heap->oh_nalloc)
{
if (0 == heap->oh_nalloc)
nalloc = 4;
else
nalloc = heap->oh_nalloc * 2;
heap->oh_elems = realloc(heap->oh_elems,
nalloc * sizeof(heap->oh_elems[0]));
if (!heap->oh_elems)
{ /* Not much we can do here */
LSQ_ERROR("realloc failed");
return;
}
heap->oh_nalloc = nalloc;
}
heap->oh_elems[ heap->oh_nelem ].ohe_conn = conn;
heap->oh_elems[ heap->oh_nelem ].ohe_last_sent = conn->cn_last_sent;
++heap->oh_nelem;
i = heap->oh_nelem - 1;
while (i > 0 && heap->oh_elems[ OHE_PARENT(i) ].ohe_last_sent >
heap->oh_elems[ i ].ohe_last_sent)
{
el = heap->oh_elems[ OHE_PARENT(i) ];
heap->oh_elems[ OHE_PARENT(i) ] = heap->oh_elems[ i ];
heap->oh_elems[ i ] = el;
i = OHE_PARENT(i);
}
}
static struct lsquic_conn *
oh_pop (struct out_heap *heap)
{
struct lsquic_conn *conn;
assert(heap->oh_nelem);
conn = heap->oh_elems[0].ohe_conn;
--heap->oh_nelem;
if (heap->oh_nelem > 0)
{
heap->oh_elems[0] = heap->oh_elems[ heap->oh_nelem ];
heapify_out_heap(heap, 0);
}
return conn;
}
void
lsquic_engine_init_settings (struct lsquic_engine_settings *settings,
unsigned flags)
{
memset(settings, 0, sizeof(*settings));
settings->es_versions = LSQUIC_DF_VERSIONS;
if (flags & ENG_SERVER)
{
settings->es_cfcw = LSQUIC_DF_CFCW_SERVER;
settings->es_sfcw = LSQUIC_DF_SFCW_SERVER;
settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_SERVER;
}
else
{
settings->es_cfcw = LSQUIC_DF_CFCW_CLIENT;
settings->es_sfcw = LSQUIC_DF_SFCW_CLIENT;
settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_CLIENT;
}
settings->es_max_streams_in = LSQUIC_DF_MAX_STREAMS_IN;
settings->es_idle_conn_to = LSQUIC_DF_IDLE_CONN_TO;
settings->es_handshake_to = LSQUIC_DF_HANDSHAKE_TO;
settings->es_silent_close = LSQUIC_DF_SILENT_CLOSE;
settings->es_max_header_list_size
= LSQUIC_DF_MAX_HEADER_LIST_SIZE;
settings->es_ua = LSQUIC_DF_UA;
settings->es_pdmd = QTAG_X509;
settings->es_aead = QTAG_AESG;
settings->es_kexs = QTAG_C255;
settings->es_support_push = LSQUIC_DF_SUPPORT_PUSH;
settings->es_support_tcid0 = LSQUIC_DF_SUPPORT_TCID0;
settings->es_support_nstp = LSQUIC_DF_SUPPORT_NSTP;
settings->es_honor_prst = LSQUIC_DF_HONOR_PRST;
settings->es_progress_check = LSQUIC_DF_PROGRESS_CHECK;
settings->es_pendrw_check = LSQUIC_DF_PENDRW_CHECK;
settings->es_rw_once = LSQUIC_DF_RW_ONCE;
settings->es_proc_time_thresh= LSQUIC_DF_PROC_TIME_THRESH;
settings->es_pace_packets = LSQUIC_DF_PACE_PACKETS;
}
/* Note: if returning an error, err_buf must be valid if non-NULL */
int
lsquic_engine_check_settings (const struct lsquic_engine_settings *settings,
unsigned flags,
char *err_buf, size_t err_buf_sz)
{
if (settings->es_cfcw < LSQUIC_MIN_FCW ||
settings->es_sfcw < LSQUIC_MIN_FCW)
{
if (err_buf)
snprintf(err_buf, err_buf_sz, "%s",
"flow control window set too low");
return -1;
}
if (0 == (settings->es_versions & LSQUIC_SUPPORTED_VERSIONS))
{
if (err_buf)
snprintf(err_buf, err_buf_sz, "%s",
"No supported QUIC versions specified");
return -1;
}
if (settings->es_versions & ~LSQUIC_SUPPORTED_VERSIONS)
{
if (err_buf)
snprintf(err_buf, err_buf_sz, "%s",
"one or more unsupported QUIC version is specified");
return -1;
}
return 0;
}
static void
free_packet (void *ctx, unsigned char *packet_data)
{
free(packet_data);
}
static void *
malloc_buf (void *ctx, size_t size)
{
return malloc(size);
}
static const struct lsquic_packout_mem_if stock_pmi =
{
malloc_buf, (void(*)(void *, void *)) free_packet,
};
lsquic_engine_t *
lsquic_engine_new (unsigned flags,
const struct lsquic_engine_api *api)
{
lsquic_engine_t *engine;
int tag_buf_len;
char err_buf[100];
if (!api->ea_packets_out)
{
LSQ_ERROR("packets_out callback is not specified");
return NULL;
}
if (api->ea_settings &&
0 != lsquic_engine_check_settings(api->ea_settings, flags,
err_buf, sizeof(err_buf)))
{
LSQ_ERROR("cannot create engine: %s", err_buf);
return NULL;
}
engine = calloc(1, sizeof(*engine));
if (!engine)
return NULL;
if (0 != lsquic_mm_init(&engine->pub.enp_mm))
{
free(engine);
return NULL;
}
if (api->ea_settings)
engine->pub.enp_settings = *api->ea_settings;
else
lsquic_engine_init_settings(&engine->pub.enp_settings, flags);
tag_buf_len = gen_ver_tags(engine->pub.enp_ver_tags_buf,
sizeof(engine->pub.enp_ver_tags_buf),
engine->pub.enp_settings.es_versions);
if (tag_buf_len <= 0)
{
LSQ_ERROR("cannot generate version tags buffer");
free(engine);
return NULL;
}
engine->pub.enp_ver_tags_len = tag_buf_len;
engine->flags = flags;
engine->stream_if = api->ea_stream_if;
engine->stream_if_ctx = api->ea_stream_if_ctx;
engine->packets_out = api->ea_packets_out;
engine->packets_out_ctx = api->ea_packets_out_ctx;
if (api->ea_pmi)
{
engine->pub.enp_pmi = api->ea_pmi;
engine->pub.enp_pmi_ctx = api->ea_pmi_ctx;
}
else
{
engine->pub.enp_pmi = &stock_pmi;
engine->pub.enp_pmi_ctx = NULL;
}
engine->pub.enp_engine = engine;
TAILQ_INIT(&engine->conns_in);
TAILQ_INIT(&engine->conns_pend_rw);
conn_hash_init(&engine->full_conns, ~0);
engine->attq = attq_create();
eng_hist_init(&engine->history);
engine->batch_size = INITIAL_OUT_BATCH_SIZE;
LSQ_INFO("instantiated engine");
return engine;
}
static void
grow_batch_size (struct lsquic_engine *engine)
{
engine->batch_size <<= engine->batch_size < MAX_OUT_BATCH_SIZE;
}
static void
shrink_batch_size (struct lsquic_engine *engine)
{
engine->batch_size >>= engine->batch_size > MIN_OUT_BATCH_SIZE;
}
/* Wrapper to make sure LSCONN_NEVER_PEND_RW gets set */
static void
destroy_conn (lsquic_conn_t *conn)
{
conn->cn_flags |= LSCONN_NEVER_PEND_RW;
conn->cn_if->ci_destroy(conn);
}
static lsquic_conn_t *
new_full_conn_client (lsquic_engine_t *engine, const char *hostname,
unsigned short max_packet_size)
{
lsquic_conn_t *conn;
unsigned flags;
flags = engine->flags & (ENG_SERVER|ENG_HTTP);
conn = full_conn_client_new(&engine->pub, engine->stream_if,
engine->stream_if_ctx, flags, hostname, max_packet_size);
if (!conn)
return NULL;
if (0 != conn_hash_add_new(&engine->full_conns, conn))
{
LSQ_WARN("cannot add connection %"PRIu64" to hash - destroy",
conn->cn_cid);
destroy_conn(conn);
return NULL;
}
assert(!(conn->cn_flags &
(CONN_REF_FLAGS
& ~LSCONN_RW_PENDING /* This flag may be set as effect of user
callbacks */
)));
conn->cn_flags |= LSCONN_HASHED;
return conn;
}
static lsquic_conn_t *
find_or_create_conn (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in,
struct packin_parse_state *ppstate, const struct sockaddr *sa_peer,
void *peer_ctx)
{
lsquic_conn_t *conn;
if (lsquic_packet_in_is_prst(packet_in)
&& !engine->pub.enp_settings.es_honor_prst)
{
LSQ_DEBUG("public reset packet: discarding");
return NULL;
}
if (!(packet_in->pi_flags & PI_CONN_ID))
{
LSQ_DEBUG("packet header does not have connection ID: discarding");
return NULL;
}
conn = conn_hash_find(&engine->full_conns, packet_in->pi_conn_id, NULL);
if (conn)
{
conn->cn_pf->pf_parse_packet_in_finish(packet_in, ppstate);
return conn;
}
return conn;
}
static void
add_conn_to_pend_rw (lsquic_engine_t *engine, lsquic_conn_t *conn,
enum rw_reason reason)
{
int hist_idx;
TAILQ_INSERT_TAIL(&engine->conns_pend_rw, conn, cn_next_pend_rw);
engine_incref_conn(conn, LSCONN_RW_PENDING);
hist_idx = conn->cn_rw_hist_idx & ((1 << RW_HIST_BITS) - 1);
conn->cn_rw_hist_buf[ hist_idx ] = reason;
++conn->cn_rw_hist_idx;
if ((int) sizeof(conn->cn_rw_hist_buf) - 1 == hist_idx)
EV_LOG_CONN_EVENT(conn->cn_cid, "added to pending RW queue ('%c'), "
"rw_hist: %.*s", (char) reason,
(int) sizeof(conn->cn_rw_hist_buf), conn->cn_rw_hist_buf);
else
EV_LOG_CONN_EVENT(conn->cn_cid, "added to pending RW queue ('%c')",
(char) reason);
}
#if !defined(NDEBUG) && __GNUC__
__attribute__((weak))
#endif
void
lsquic_engine_add_conn_to_pend_rw (struct lsquic_engine_public *enpub,
lsquic_conn_t *conn, enum rw_reason reason)
{
if (0 == (enpub->enp_flags & ENPUB_PROC) &&
0 == (conn->cn_flags & (LSCONN_RW_PENDING|LSCONN_NEVER_PEND_RW)))
{
lsquic_engine_t *engine = (lsquic_engine_t *) enpub;
add_conn_to_pend_rw(engine, conn, reason);
}
}
void
lsquic_engine_add_conn_to_attq (struct lsquic_engine_public *enpub,
lsquic_conn_t *conn, lsquic_time_t tick_time)
{
lsquic_engine_t *const engine = (lsquic_engine_t *) enpub;
/* Instead of performing an update, we simply remove the connection from
* the queue and add it back. This should not happen in at the time of
* this writing.
*/
if (conn->cn_flags & LSCONN_ATTQ)
{
attq_remove(engine->attq, conn);
conn = engine_decref_conn(engine, conn, LSCONN_ATTQ);
}
if (conn && !(conn->cn_flags & LSCONN_ATTQ) &&
0 == attq_maybe_add(engine->attq, conn, tick_time))
engine_incref_conn(conn, LSCONN_ATTQ);
}
static void
update_pend_rw_progress (lsquic_engine_t *engine, lsquic_conn_t *conn,
int progress_made)
{
rw_hist_idx_t hist_idx;
const unsigned char *empty;
const unsigned pendrw_check = engine->pub.enp_settings.es_pendrw_check;
if (!pendrw_check)
return;
/* Convert previous entry to uppercase: */
hist_idx = (conn->cn_rw_hist_idx - 1) & ((1 << RW_HIST_BITS) - 1);
conn->cn_rw_hist_buf[ hist_idx ] -= 0x20;
LSQ_DEBUG("conn %"PRIu64": progress: %d", conn->cn_cid, !!progress_made);
if (progress_made)
{
conn->cn_noprogress_count = 0;
return;
}
EV_LOG_CONN_EVENT(conn->cn_cid, "Pending RW Queue processing made "
"no progress");
++conn->cn_noprogress_count;
if (conn->cn_noprogress_count <= pendrw_check)
return;
conn->cn_flags |= LSCONN_NEVER_PEND_RW;
empty = memchr(conn->cn_rw_hist_buf, RW_REASON_EMPTY,
sizeof(conn->cn_rw_hist_buf));
if (empty)
LSQ_WARN("conn %"PRIu64" noprogress count reached %u "
"(rw_hist: %.*s): will not put it onto Pend RW queue again",
conn->cn_cid, conn->cn_noprogress_count,
(int) (empty - conn->cn_rw_hist_buf), conn->cn_rw_hist_buf);
else
{
hist_idx = conn->cn_rw_hist_idx & ((1 << RW_HIST_BITS) - 1);
LSQ_WARN("conn %"PRIu64" noprogress count reached %u "
"(rw_hist: %.*s%.*s): will not put it onto Pend RW queue again",
conn->cn_cid, conn->cn_noprogress_count,
/* First part of history: */
(int) (sizeof(conn->cn_rw_hist_buf) - hist_idx),
conn->cn_rw_hist_buf + hist_idx,
/* Second part of history: */
hist_idx, conn->cn_rw_hist_buf);
}
}
/* Return 0 if packet is being processed by a connections, otherwise return 1 */
static int
process_packet_in (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in,
struct packin_parse_state *ppstate, const struct sockaddr *sa_local,
const struct sockaddr *sa_peer, void *peer_ctx)
{
lsquic_conn_t *conn;
conn = find_or_create_conn(engine, packet_in, ppstate, sa_peer, peer_ctx);
if (!conn)
{
lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in);
return 1;
}
if (0 == (conn->cn_flags & LSCONN_HAS_INCOMING)) {
TAILQ_INSERT_TAIL(&engine->conns_in, conn, cn_next_in);
engine_incref_conn(conn, LSCONN_HAS_INCOMING);
}
lsquic_conn_record_sockaddr(conn, sa_local, sa_peer);
lsquic_packet_in_upref(packet_in);
conn->cn_peer_ctx = peer_ctx;
conn->cn_if->ci_packet_in(conn, packet_in);
lsquic_packet_in_put(&engine->pub.enp_mm, packet_in);
return 0;
}
static int
conn_attq_expired (const struct lsquic_engine *engine,
const lsquic_conn_t *conn)
{
assert(conn->cn_attq_elem);
return lsquic_conn_adv_time(conn) < engine->proc_time;
}
/* Iterator for connections with incoming packets */
static lsquic_conn_t *
conn_iter_next_incoming (struct lsquic_engine *engine)
{
enum lsquic_conn_flags addl_flags;
lsquic_conn_t *conn;
while ((conn = TAILQ_FIRST(&engine->conns_in)))
{
TAILQ_REMOVE(&engine->conns_in, conn, cn_next_in);
if (conn->cn_flags & LSCONN_RW_PENDING)
{
TAILQ_REMOVE(&engine->conns_pend_rw, conn, cn_next_pend_rw);
EV_LOG_CONN_EVENT(conn->cn_cid,
"removed from pending RW queue (processing incoming)");
}
if ((conn->cn_flags & LSCONN_ATTQ) && conn_attq_expired(engine, conn))
{
addl_flags = LSCONN_ATTQ;
attq_remove(engine->attq, conn);
}
else
addl_flags = 0;
conn = engine_decref_conn(engine, conn,
LSCONN_RW_PENDING|LSCONN_HAS_INCOMING|addl_flags);
if (conn)
break;
}
return conn;
}
/* Iterator for connections with that have pending read/write events */
static lsquic_conn_t *
conn_iter_next_rw_pend (struct lsquic_engine *engine)
{
enum lsquic_conn_flags addl_flags;
lsquic_conn_t *conn;
while ((conn = TAILQ_FIRST(&engine->conns_pend_rw)))
{
TAILQ_REMOVE(&engine->conns_pend_rw, conn, cn_next_pend_rw);
EV_LOG_CONN_EVENT(conn->cn_cid,
"removed from pending RW queue (processing pending RW conns)");
if (conn->cn_flags & LSCONN_HAS_INCOMING)
TAILQ_REMOVE(&engine->conns_in, conn, cn_next_in);
if ((conn->cn_flags & LSCONN_ATTQ) && conn_attq_expired(engine, conn))
{
addl_flags = LSCONN_ATTQ;
attq_remove(engine->attq, conn);
}
else
addl_flags = 0;
conn = engine_decref_conn(engine, conn,
LSCONN_RW_PENDING|LSCONN_HAS_INCOMING|addl_flags);
if (conn)
break;
}
return conn;
}
void
lsquic_engine_process_conns_with_incoming (lsquic_engine_t *engine)
{
LSQ_DEBUG("process connections with incoming packets");
ENGINE_IN(engine);
process_connections(engine, conn_iter_next_incoming);
assert(TAILQ_EMPTY(&engine->conns_in));
ENGINE_OUT(engine);
}
int
lsquic_engine_has_pend_rw (lsquic_engine_t *engine)
{
return !(engine->flags & ENG_PAST_DEADLINE)
&& !TAILQ_EMPTY(&engine->conns_pend_rw);
}
void
lsquic_engine_process_conns_with_pend_rw (lsquic_engine_t *engine)
{
LSQ_DEBUG("process connections with pending RW events");
ENGINE_IN(engine);
process_connections(engine, conn_iter_next_rw_pend);
ENGINE_OUT(engine);
}
void
lsquic_engine_destroy (lsquic_engine_t *engine)
{
lsquic_conn_t *conn;
LSQ_DEBUG("destroying engine");
#ifndef NDEBUG
engine->flags |= ENG_DTOR;
#endif
while (engine->conns_out.oh_nelem > 0)
{
--engine->conns_out.oh_nelem;
conn = engine->conns_out.oh_elems[
engine->conns_out.oh_nelem ].ohe_conn;
assert(conn->cn_flags & LSCONN_HAS_OUTGOING);
(void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING);
}
for (conn = conn_hash_first(&engine->full_conns); conn;
conn = conn_hash_next(&engine->full_conns))
force_close_conn(engine, conn);
conn_hash_cleanup(&engine->full_conns);
attq_destroy(engine->attq);
assert(0 == engine->conns_out.oh_nelem);
assert(TAILQ_EMPTY(&engine->conns_pend_rw));
lsquic_mm_cleanup(&engine->pub.enp_mm);
free(engine->conns_out.oh_elems);
free(engine);
}
#if __GNUC__
__attribute__((nonnull(3)))
#endif
static lsquic_conn_t *
remove_from_inc_andor_pend_rw (lsquic_engine_t *engine,
lsquic_conn_t *conn, const char *reason)
{
assert(conn->cn_flags & (LSCONN_HAS_INCOMING|LSCONN_RW_PENDING));
if (conn->cn_flags & LSCONN_HAS_INCOMING)
TAILQ_REMOVE(&engine->conns_in, conn, cn_next_in);
if (conn->cn_flags & LSCONN_RW_PENDING)
{
TAILQ_REMOVE(&engine->conns_pend_rw, conn, cn_next_pend_rw);
EV_LOG_CONN_EVENT(conn->cn_cid,
"removed from pending RW queue (%s)", reason);
}
conn = engine_decref_conn(engine, conn,
LSCONN_HAS_INCOMING|LSCONN_RW_PENDING);
assert(conn);
return conn;
}
static lsquic_conn_t *
conn_iter_next_one (lsquic_engine_t *engine)
{
lsquic_conn_t *conn = engine->iter_state.one.conn;
if (conn)
{
if (conn->cn_flags & (LSCONN_HAS_INCOMING|LSCONN_RW_PENDING))
conn = remove_from_inc_andor_pend_rw(engine, conn, "connect");
if (conn && (conn->cn_flags & LSCONN_ATTQ) &&
conn_attq_expired(engine, conn))
{
attq_remove(engine->attq, conn);
conn = engine_decref_conn(engine, conn, LSCONN_ATTQ);
}
engine->iter_state.one.conn = NULL;
}
return conn;
}
int
lsquic_engine_connect (lsquic_engine_t *engine, const struct sockaddr *peer_sa,
void *conn_ctx, const char *hostname,
unsigned short max_packet_size)
{
lsquic_conn_t *conn;
if (engine->flags & ENG_SERVER)
{
LSQ_ERROR("`%s' must only be called in client mode", __func__);
return -1;
}
if (0 == max_packet_size)
{
switch (peer_sa->sa_family)
{
case AF_INET:
max_packet_size = QUIC_MAX_IPv4_PACKET_SZ;
break;
default:
max_packet_size = QUIC_MAX_IPv6_PACKET_SZ;
break;
}
}
conn = new_full_conn_client(engine, hostname, max_packet_size);
if (!conn)
return -1;
lsquic_conn_record_peer_sa(conn, peer_sa);
conn->cn_peer_ctx = conn_ctx;
engine->iter_state.one.conn = conn;
process_connections(engine, conn_iter_next_one);
return 0;
}
static void
remove_conn_from_hash (lsquic_engine_t *engine, lsquic_conn_t *conn)
{
conn_hash_remove(&engine->full_conns, conn);
(void) engine_decref_conn(engine, conn, LSCONN_HASHED);
}
static void
refflags2str (enum lsquic_conn_flags flags, char s[7])
{
*s = 'C'; s += !!(flags & LSCONN_CLOSING);
*s = 'H'; s += !!(flags & LSCONN_HASHED);
*s = 'O'; s += !!(flags & LSCONN_HAS_OUTGOING);
*s = 'I'; s += !!(flags & LSCONN_HAS_INCOMING);
*s = 'R'; s += !!(flags & LSCONN_RW_PENDING);
*s = 'A'; s += !!(flags & LSCONN_ATTQ);
*s = '\0';
}
static void
engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag)
{
char str[7];
assert(flag & CONN_REF_FLAGS);
assert(!(conn->cn_flags & flag));
conn->cn_flags |= flag;
LSQ_DEBUG("incref conn %"PRIu64", now '%s'", conn->cn_cid,
(refflags2str(conn->cn_flags, str), str));
}
static lsquic_conn_t *
engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn,
enum lsquic_conn_flags flags)
{
char str[7];
assert(flags & CONN_REF_FLAGS);
assert(conn->cn_flags & flags);
#ifndef NDEBUG
if (flags & LSCONN_CLOSING)
assert(0 == (conn->cn_flags & LSCONN_HASHED));
#endif
conn->cn_flags &= ~flags;
LSQ_DEBUG("decref conn %"PRIu64", now '%s'", conn->cn_cid,
(refflags2str(conn->cn_flags, str), str));
if (0 == (conn->cn_flags & CONN_REF_FLAGS))
{
eng_hist_inc(&engine->history, 0, sl_del_full_conns);
destroy_conn(conn);
return NULL;
}
else
return conn;
}
/* This is not a general-purpose function. Only call from engine dtor. */
static void
force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn)
{
assert(engine->flags & ENG_DTOR);
const enum lsquic_conn_flags flags = conn->cn_flags;
assert(conn->cn_flags & CONN_REF_FLAGS);
assert(!(flags & LSCONN_HAS_OUTGOING)); /* Should be removed already */
assert(!(flags & LSCONN_CLOSING)); /* It is in transient queue? */
if (flags & LSCONN_HAS_INCOMING)
{
TAILQ_REMOVE(&engine->conns_in, conn, cn_next_in);
(void) engine_decref_conn(engine, conn, LSCONN_HAS_INCOMING);
}
if (flags & LSCONN_RW_PENDING)
{
TAILQ_REMOVE(&engine->conns_pend_rw, conn, cn_next_pend_rw);
EV_LOG_CONN_EVENT(conn->cn_cid,
"removed from pending RW queue (engine destruction)");
(void) engine_decref_conn(engine, conn, LSCONN_RW_PENDING);
}
if (flags & LSCONN_ATTQ)
attq_remove(engine->attq, conn);
if (flags & LSCONN_HASHED)
remove_conn_from_hash(engine, conn);
}
/* Iterator for all connections.
* Returned connections are removed from the Incoming, Pending RW Event,
* and Advisory Tick Time queues if necessary.
*/
static lsquic_conn_t *
conn_iter_next_all (struct lsquic_engine *engine)
{
lsquic_conn_t *conn;
conn = conn_hash_next(&engine->full_conns);
if (conn && (conn->cn_flags & (LSCONN_HAS_INCOMING|LSCONN_RW_PENDING)))
conn = remove_from_inc_andor_pend_rw(engine, conn, "process all");
if (conn && (conn->cn_flags & LSCONN_ATTQ)
&& conn_attq_expired(engine, conn))
{
attq_remove(engine->attq, conn);
conn = engine_decref_conn(engine, conn, LSCONN_ATTQ);
}
return conn;
}
static lsquic_conn_t *
conn_iter_next_attq (struct lsquic_engine *engine)
{
lsquic_conn_t *conn;
conn = attq_pop(engine->attq, engine->iter_state.attq.cutoff);
if (conn)
{
assert(conn->cn_flags & LSCONN_ATTQ);
if (conn->cn_flags & (LSCONN_HAS_INCOMING|LSCONN_RW_PENDING))
conn = remove_from_inc_andor_pend_rw(engine, conn, "process attq");
conn = engine_decref_conn(engine, conn, LSCONN_ATTQ);
}
return conn;
}
void
lsquic_engine_proc_all (lsquic_engine_t *engine)
{
ENGINE_IN(engine);
/* We poke each connection every time as initial implementation. If it
* proves to be too inefficient, we will need to figure out
* a) when to stop processing; and
* b) how to remember state between calls.
*/
conn_hash_reset_iter(&engine->full_conns);
process_connections(engine, conn_iter_next_all);
ENGINE_OUT(engine);
}
void
lsquic_engine_process_conns_to_tick (lsquic_engine_t *engine)
{
lsquic_time_t prev_min, cutoff;
LSQ_DEBUG("process connections in attq");
ENGINE_IN(engine);
cutoff = lsquic_time_now();
prev_min = attq_set_min(engine->attq, cutoff); /* Prevent infinite loop */
engine->iter_state.attq.cutoff = cutoff;
process_connections(engine, conn_iter_next_attq);
attq_set_min(engine->attq, prev_min); /* Restore previos value */
ENGINE_OUT(engine);
}
static int
generate_header (const lsquic_packet_out_t *packet_out,
const struct parse_funcs *pf, lsquic_cid_t cid,
unsigned char *buf, size_t bufsz)
{
return pf->pf_gen_reg_pkt_header(buf, bufsz,
packet_out->po_flags & PO_CONN_ID ? &cid : NULL,
packet_out->po_flags & PO_VERSION ? &packet_out->po_ver_tag : NULL,
packet_out->po_flags & PO_NONCE ? packet_out->po_nonce : NULL,
packet_out->po_packno, lsquic_packet_out_packno_bits(packet_out));
}
static ssize_t
really_encrypt_packet (const lsquic_conn_t *conn,
const lsquic_packet_out_t *packet_out,
unsigned char *buf, size_t bufsz)
{
int enc, header_sz, is_hello_packet;
size_t packet_sz;
unsigned char header_buf[QUIC_MAX_PUBHDR_SZ];
header_sz = generate_header(packet_out, conn->cn_pf, conn->cn_cid,
header_buf, sizeof(header_buf));
if (header_sz < 0)
return -1;
is_hello_packet = !!(packet_out->po_flags & PO_HELLO);
enc = lsquic_enc(conn->cn_enc_session, conn->cn_version, 0,
packet_out->po_packno, header_buf, header_sz,
packet_out->po_data, packet_out->po_data_sz,
buf, bufsz, &packet_sz, is_hello_packet);
if (0 == enc)
{
LSQ_DEBUG("encrypted packet %"PRIu64"; plaintext is %u bytes, "
"ciphertext is %zd bytes",
packet_out->po_packno,
lsquic_po_header_length(packet_out->po_flags) +
packet_out->po_data_sz,
packet_sz);
return packet_sz;
}
else
return -1;
}
static enum { ENCPA_OK, ENCPA_NOMEM, ENCPA_BADCRYPT, }
encrypt_packet (lsquic_engine_t *engine, const lsquic_conn_t *conn,
lsquic_packet_out_t *packet_out)
{
ssize_t enc_sz;
size_t bufsz;
unsigned char *buf;
bufsz = lsquic_po_header_length(packet_out->po_flags) +
packet_out->po_data_sz + QUIC_PACKET_HASH_SZ;
buf = engine->pub.enp_pmi->pmi_allocate(engine->pub.enp_pmi_ctx, bufsz);
if (!buf)
{
LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd",
bufsz);
return ENCPA_NOMEM;
}
enc_sz = really_encrypt_packet(conn, packet_out, buf, bufsz);
if (enc_sz < 0)
{
engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, buf);
return ENCPA_BADCRYPT;
}
packet_out->po_enc_data = buf;
packet_out->po_enc_data_sz = enc_sz;
packet_out->po_flags |= PO_ENCRYPTED;
return ENCPA_OK;
}
struct out_batch
{
lsquic_conn_t *conns [MAX_OUT_BATCH_SIZE];
lsquic_packet_out_t *packets[MAX_OUT_BATCH_SIZE];
struct lsquic_out_spec outs [MAX_OUT_BATCH_SIZE];
};
STAILQ_HEAD(closed_conns, lsquic_conn);
struct conns_out_iter
{
struct out_heap *coi_heap;
TAILQ_HEAD(, lsquic_conn) coi_active_list,
coi_inactive_list;
lsquic_conn_t *coi_next;
#ifndef NDEBUG
lsquic_time_t coi_last_sent;
#endif
};
static void
coi_init (struct conns_out_iter *iter, struct lsquic_engine *engine)
{
iter->coi_heap = &engine->conns_out;
iter->coi_next = NULL;
TAILQ_INIT(&iter->coi_active_list);
TAILQ_INIT(&iter->coi_inactive_list);
#ifndef NDEBUG
iter->coi_last_sent = 0;
#endif
}
static lsquic_conn_t *
coi_next (struct conns_out_iter *iter)
{
lsquic_conn_t *conn;
if (iter->coi_heap->oh_nelem > 0)
{
conn = oh_pop(iter->coi_heap);
TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out);
conn->cn_flags |= LSCONN_COI_ACTIVE;
#ifndef NDEBUG
if (iter->coi_last_sent)
assert(iter->coi_last_sent <= conn->cn_last_sent);
iter->coi_last_sent = conn->cn_last_sent;
#endif
return conn;
}
else if (!TAILQ_EMPTY(&iter->coi_active_list))
{
conn = iter->coi_next;
if (!conn)
conn = TAILQ_FIRST(&iter->coi_active_list);
if (conn)
iter->coi_next = TAILQ_NEXT(conn, cn_next_out);
return conn;
}
else
return NULL;
}
static void
coi_deactivate (struct conns_out_iter *iter, lsquic_conn_t *conn)
{
if (!(conn->cn_flags & LSCONN_EVANESCENT))
{
assert(!TAILQ_EMPTY(&iter->coi_active_list));
TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out);
conn->cn_flags &= ~LSCONN_COI_ACTIVE;
TAILQ_INSERT_TAIL(&iter->coi_inactive_list, conn, cn_next_out);
conn->cn_flags |= LSCONN_COI_INACTIVE;
}
}
static void
coi_remove (struct conns_out_iter *iter, lsquic_conn_t *conn)
{
assert(conn->cn_flags & LSCONN_COI_ACTIVE);
if (conn->cn_flags & LSCONN_COI_ACTIVE)
{
TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out);
conn->cn_flags &= ~LSCONN_COI_ACTIVE;
}
}
static void
coi_reactivate (struct conns_out_iter *iter, lsquic_conn_t *conn)
{
assert(conn->cn_flags & LSCONN_COI_INACTIVE);
TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out);
conn->cn_flags &= ~LSCONN_COI_INACTIVE;
TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out);
conn->cn_flags |= LSCONN_COI_ACTIVE;
}
static void
coi_reheap (struct conns_out_iter *iter, lsquic_engine_t *engine)
{
lsquic_conn_t *conn;
while ((conn = TAILQ_FIRST(&iter->coi_active_list)))
{
TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out);
conn->cn_flags &= ~LSCONN_COI_ACTIVE;
oh_insert(iter->coi_heap, conn);
}
while ((conn = TAILQ_FIRST(&iter->coi_inactive_list)))
{
TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out);
conn->cn_flags &= ~LSCONN_COI_INACTIVE;
(void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING);
}
}
static unsigned
send_batch (lsquic_engine_t *engine, struct conns_out_iter *conns_iter,
struct out_batch *batch, unsigned n_to_send)
{
int n_sent, i;
lsquic_time_t now;
/* Set sent time before the write to avoid underestimating RTT */
now = lsquic_time_now();
for (i = 0; i < (int) n_to_send; ++i)
batch->packets[i]->po_sent = now;
n_sent = engine->packets_out(engine->packets_out_ctx, batch->outs,
n_to_send);
if (n_sent >= 0)
LSQ_DEBUG("packets out returned %d (out of %u)", n_sent, n_to_send);
else
{
LSQ_DEBUG("packets out returned an error: %s", strerror(errno));
n_sent = 0;
}
if (n_sent > 0)
engine->last_sent = now + n_sent;
for (i = 0; i < n_sent; ++i)
{
eng_hist_inc(&engine->history, now, sl_packets_out);
EV_LOG_PACKET_SENT(batch->conns[i]->cn_cid, batch->packets[i]);
batch->conns[i]->cn_if->ci_packet_sent(batch->conns[i],
batch->packets[i]);
/* `i' is added to maintain relative order */
batch->conns[i]->cn_last_sent = now + i;
/* Release packet out buffer as soon as the packet is sent
* successfully. If not successfully sent, we hold on to
* this buffer until the packet sending is attempted again
* or until it times out and regenerated.
*/
if (batch->packets[i]->po_flags & PO_ENCRYPTED)
{
batch->packets[i]->po_flags &= ~PO_ENCRYPTED;
engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx,
batch->packets[i]->po_enc_data);
batch->packets[i]->po_enc_data = NULL; /* JIC */
}
}
if (LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_EVENT))
for ( ; i < (int) n_to_send; ++i)
EV_LOG_PACKET_NOT_SENT(batch->conns[i]->cn_cid, batch->packets[i]);
/* Return packets to the connection in reverse order so that the packet
* ordering is maintained.
*/
for (i = (int) n_to_send - 1; i >= n_sent; --i)
{
batch->conns[i]->cn_if->ci_packet_not_sent(batch->conns[i],
batch->packets[i]);
if (!(batch->conns[i]->cn_flags & (LSCONN_COI_ACTIVE|LSCONN_EVANESCENT)))
coi_reactivate(conns_iter, batch->conns[i]);
}
return n_sent;
}
/* Return 1 if went past deadline, 0 otherwise */
static int
check_deadline (lsquic_engine_t *engine)
{
if (engine->pub.enp_settings.es_proc_time_thresh &&
lsquic_time_now() > engine->deadline)
{
LSQ_INFO("went past threshold of %u usec, stop sending",
engine->pub.enp_settings.es_proc_time_thresh);
engine->flags |= ENG_PAST_DEADLINE;
return 1;
}
else
return 0;
}
static void
send_packets_out (struct lsquic_engine *engine,
struct closed_conns *closed_conns)
{
unsigned n, w, n_sent, n_batches_sent;
lsquic_packet_out_t *packet_out;
lsquic_conn_t *conn;
struct out_batch batch;
struct conns_out_iter conns_iter;
int shrink, deadline_exceeded;
coi_init(&conns_iter, engine);
n_batches_sent = 0;
n_sent = 0, n = 0;
shrink = 0;
deadline_exceeded = 0;
while ((conn = coi_next(&conns_iter)))
{
packet_out = conn->cn_if->ci_next_packet_to_send(conn);
if (!packet_out) {
LSQ_DEBUG("batched all outgoing packets for conn %"PRIu64,
conn->cn_cid);
coi_deactivate(&conns_iter, conn);
continue;
}
if (!(packet_out->po_flags & (PO_ENCRYPTED|PO_NOENCRYPT)))
{
switch (encrypt_packet(engine, conn, packet_out))
{
case ENCPA_NOMEM:
/* Send what we have and wait for a more opportune moment */
conn->cn_if->ci_packet_not_sent(conn, packet_out);
goto end_for;
case ENCPA_BADCRYPT:
/* This is pretty bad: close connection immediately */
conn->cn_if->ci_packet_not_sent(conn, packet_out);
LSQ_INFO("conn %"PRIu64" has unsendable packets", conn->cn_cid);
if (!(conn->cn_flags & LSCONN_EVANESCENT))
{
if (!(conn->cn_flags & LSCONN_CLOSING))
{
STAILQ_INSERT_TAIL(closed_conns, conn, cn_next_closed_conn);
engine_incref_conn(conn, LSCONN_CLOSING);
if (conn->cn_flags & LSCONN_HASHED)
remove_conn_from_hash(engine, conn);
}
coi_remove(&conns_iter, conn);
}
continue;
case ENCPA_OK:
break;
}
}
LSQ_DEBUG("batched packet %"PRIu64" for connection %"PRIu64,
packet_out->po_packno, conn->cn_cid);
assert(conn->cn_flags & LSCONN_HAS_PEER_SA);
if (packet_out->po_flags & PO_ENCRYPTED)
{
batch.outs[n].buf = packet_out->po_enc_data;
batch.outs[n].sz = packet_out->po_enc_data_sz;
}
else
{
batch.outs[n].buf = packet_out->po_data;
batch.outs[n].sz = packet_out->po_data_sz;
}
batch.outs [n].peer_ctx = conn->cn_peer_ctx;
batch.outs [n].local_sa = (struct sockaddr *) conn->cn_local_addr;
batch.outs [n].dest_sa = (struct sockaddr *) conn->cn_peer_addr;
batch.conns [n] = conn;
batch.packets[n] = packet_out;
++n;
if (n == engine->batch_size)
{
n = 0;
w = send_batch(engine, &conns_iter, &batch, engine->batch_size);
++n_batches_sent;
n_sent += w;
if (w < engine->batch_size)
{
shrink = 1;
break;
}
deadline_exceeded = check_deadline(engine);
if (deadline_exceeded)
break;
grow_batch_size(engine);
}
}
end_for:
if (n > 0) {
w = send_batch(engine, &conns_iter, &batch, n);
n_sent += w;
shrink = w < n;
++n_batches_sent;
deadline_exceeded = check_deadline(engine);
}
if (shrink)
shrink_batch_size(engine);
else if (n_batches_sent > 1 && !deadline_exceeded)
grow_batch_size(engine);
coi_reheap(&conns_iter, engine);
LSQ_DEBUG("%s: sent %u packet%.*s", __func__, n_sent, n_sent != 1, "s");
}
int
lsquic_engine_has_unsent_packets (lsquic_engine_t *engine)
{
return !(engine->flags & ENG_PAST_DEADLINE)
&& ( engine->conns_out.oh_nelem > 0
)
;
}
static void
reset_deadline (lsquic_engine_t *engine, lsquic_time_t now)
{
engine->deadline = now + engine->pub.enp_settings.es_proc_time_thresh;
engine->flags &= ~ENG_PAST_DEADLINE;
}
/* TODO: this is a user-facing function, account for load */
void
lsquic_engine_send_unsent_packets (lsquic_engine_t *engine)
{
lsquic_conn_t *conn;
struct closed_conns closed_conns;
STAILQ_INIT(&closed_conns);
reset_deadline(engine, lsquic_time_now());
send_packets_out(engine, &closed_conns);
while ((conn = STAILQ_FIRST(&closed_conns))) {
STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn);
(void) engine_decref_conn(engine, conn, LSCONN_CLOSING);
}
}
static void
process_connections (lsquic_engine_t *engine, conn_iter_f next_conn)
{
lsquic_conn_t *conn;
enum tick_st tick_st;
lsquic_time_t now = lsquic_time_now();
struct closed_conns closed_conns;
engine->proc_time = now;
eng_hist_tick(&engine->history, now);
STAILQ_INIT(&closed_conns);
reset_deadline(engine, now);
while ((conn = next_conn(engine)))
{
tick_st = conn->cn_if->ci_tick(conn, now);
if (conn_iter_next_rw_pend == next_conn)
update_pend_rw_progress(engine, conn, tick_st & TICK_PROGRESS);
if (tick_st & TICK_SEND)
{
if (!(conn->cn_flags & LSCONN_HAS_OUTGOING))
{
oh_insert(&engine->conns_out, conn);
engine_incref_conn(conn, LSCONN_HAS_OUTGOING);
}
}
if (tick_st & TICK_CLOSE)
{
STAILQ_INSERT_TAIL(&closed_conns, conn, cn_next_closed_conn);
engine_incref_conn(conn, LSCONN_CLOSING);
if (conn->cn_flags & LSCONN_HASHED)
remove_conn_from_hash(engine, conn);
}
}
if (lsquic_engine_has_unsent_packets(engine))
send_packets_out(engine, &closed_conns);
while ((conn = STAILQ_FIRST(&closed_conns))) {
STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn);
(void) engine_decref_conn(engine, conn, LSCONN_CLOSING);
}
}
/* Return 0 if packet is being processed by a real connection, 1 if the
* packet was processed, but not by a connection, and -1 on error.
*/
int
lsquic_engine_packet_in (lsquic_engine_t *engine,
const unsigned char *packet_in_data, size_t packet_in_size,
const struct sockaddr *sa_local, const struct sockaddr *sa_peer,
void *peer_ctx)
{
struct packin_parse_state ppstate;
lsquic_packet_in_t *packet_in;
if (packet_in_size > QUIC_MAX_PACKET_SZ)
{
LSQ_DEBUG("Cannot handle packet_in_size(%zd) > %d packet incoming "
"packet's header", packet_in_size, QUIC_MAX_PACKET_SZ);
errno = E2BIG;
return -1;
}
packet_in = lsquic_mm_get_packet_in(&engine->pub.enp_mm);
if (!packet_in)
return -1;
/* Library does not modify packet_in_data, it is not referenced after
* this function returns and subsequent release of pi_data is guarded
* by PI_OWN_DATA flag.
*/
packet_in->pi_data = (unsigned char *) packet_in_data;
if (0 != parse_packet_in_begin(packet_in, packet_in_size,
engine->flags & ENG_SERVER, &ppstate))
{
LSQ_DEBUG("Cannot parse incoming packet's header");
lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in);
errno = EINVAL;
return -1;
}
packet_in->pi_received = lsquic_time_now();
eng_hist_inc(&engine->history, packet_in->pi_received, sl_packets_in);
return process_packet_in(engine, packet_in, &ppstate, sa_local, sa_peer,
peer_ctx);
}
#if __GNUC__ && !defined(NDEBUG)
__attribute__((weak))
#endif
unsigned
lsquic_engine_quic_versions (const lsquic_engine_t *engine)
{
return engine->pub.enp_settings.es_versions;
}
int
lsquic_engine_earliest_adv_tick (lsquic_engine_t *engine, int *diff)
{
const lsquic_time_t *next_time;
lsquic_time_t now;
next_time = attq_next_time(engine->attq);
if (!next_time)
return 0;
now = lsquic_time_now();
*diff = (int) ((int64_t) *next_time - (int64_t) now);
return 1;
}
unsigned
lsquic_engine_count_attq (lsquic_engine_t *engine, int from_now)
{
lsquic_time_t now;
now = lsquic_time_now();
if (from_now < 0)
now -= from_now;
else
now += from_now;
return attq_count_before(engine->attq, now);
}
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