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litespeed-quic/src/liblsquic/lsquic_full_conn.c

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/* Copyright (c) 2017 - 2022 LiteSpeed Technologies Inc. See LICENSE. */
/*
* lsquic_full_conn.c -- A "full" connection object has full functionality
*/
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#ifndef WIN32
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/time.h>
#endif
#include <sys/queue.h>
#include <openssl/ssl.h>
#include "lsquic_types.h"
#include "lsquic_sizes.h"
#include "lsquic.h"
#include "lsquic_packet_common.h"
#include "lsquic_alarmset.h"
#include "lsquic_packet_gquic.h"
#include "lsquic_parse.h"
#include "lsquic_packet_in.h"
#include "lsquic_packet_out.h"
#include "lsquic_rechist.h"
#include "lsquic_util.h"
#include "lsquic_conn_flow.h"
#include "lsquic_sfcw.h"
#include "lsquic_varint.h"
#include "lsquic_hq.h"
#include "lsquic_hash.h"
#include "lsquic_stream.h"
#include "lsquic_senhist.h"
#include "lsquic_rtt.h"
#include "lsquic_cubic.h"
#include "lsquic_pacer.h"
#include "lsquic_bw_sampler.h"
#include "lsquic_minmax.h"
#include "lsquic_bbr.h"
#include "lsquic_adaptive_cc.h"
#include "lsquic_set.h"
#include "lsquic_malo.h"
#include "lsquic_chsk_stream.h"
#include "lsquic_shsk_stream.h"
#include "lshpack.h"
#include "lsquic_str.h"
#include "lsquic_qtags.h"
#include "lsquic_enc_sess.h"
#include "lsquic_headers_stream.h"
#include "lsquic_frame_common.h"
#include "lsquic_frame_reader.h"
#include "lsquic_frame_writer.h"
#include "lsquic_http1x_if.h"
#include "lsquic_mm.h"
#include "lsquic_engine_public.h"
#include "lsquic_spi.h"
#include "lsquic_ev_log.h"
#include "lsquic_version.h"
#include "lsquic_headers.h"
#include "lsquic_handshake.h"
#include "lsquic_attq.h"
#include "lsquic_conn.h"
#include "lsquic_send_ctl.h"
#include "lsquic_conn_public.h"
#include "lsquic_ver_neg.h"
#include "lsquic_mini_conn.h"
#include "lsquic_full_conn.h"
#define LSQUIC_LOGGER_MODULE LSQLM_CONN
#define LSQUIC_LOG_CONN_ID lsquic_conn_log_cid(&conn->fc_conn)
#include "lsquic_logger.h"
enum stream_if { STREAM_IF_STD, STREAM_IF_HSK, STREAM_IF_HDR, N_STREAM_IFS };
#define MAX_RETR_PACKETS_SINCE_LAST_ACK 2
#define ACK_TIMEOUT 25000
/* Maximum number of ACK ranges that can fit into gQUIC ACK frame */
#define MAX_ACK_RANGES 256
/* HANDSHAKE and HEADERS streams are always open in gQUIC connection */
#define N_SPECIAL_STREAMS 2
/* IMPORTANT: Keep values of FC_SERVER and FC_HTTP same as LSENG_SERVER
* and LSENG_HTTP.
*/
enum full_conn_flags {
FC_SERVER = LSENG_SERVER, /* Server mode */
FC_HTTP = LSENG_HTTP, /* HTTP mode */
FC_TIMED_OUT = (1 << 2),
#define FC_BIT_ERROR 3
FC_ERROR = (1 << FC_BIT_ERROR),
FC_ABORTED = (1 << 4),
FC_CLOSING = (1 << 5), /* Closing */
FC_SEND_PING = (1 << 6), /* PING frame scheduled */
FC_NSTP = (1 << 7), /* NSTP mode */
FC_SEND_GOAWAY = (1 << 8),
FC_SEND_WUF = (1 << 9),
FC_SEND_STOP_WAITING
= (1 <<10),
FC_ACK_QUEUED = (1 <<11),
FC_ACK_HAD_MISS = (1 <<12), /* Last ACK frame had missing packets. */
FC_CREATED_OK = (1 <<13),
FC_RECV_CLOSE = (1 <<14), /* Received CONNECTION_CLOSE frame */
FC_GOING_AWAY = (1 <<15), /* Do not accept or create new streams */
FC_GOAWAY_SENT = (1 <<16), /* Only send GOAWAY once */
FC_SUPPORT_PUSH = (1 <<17),
FC_GOT_PRST = (1 <<18), /* Received public reset packet */
FC_FIRST_TICK = (1 <<19),
FC_TICK_CLOSE = (1 <<20), /* We returned TICK_CLOSE */
FC_HSK_FAILED = (1 <<21),
FC_HAVE_SAVED_ACK = (1 <<22),
FC_ABORT_COMPLAINED
= (1 <<23),
FC_GOT_SREJ = (1 <<24), /* Don't schedule ACK alarm */
FC_NOPROG_TIMEOUT = (1 <<25),
};
#define FC_IMMEDIATE_CLOSE_FLAGS \
(FC_TIMED_OUT|FC_ERROR|FC_ABORTED|FC_HSK_FAILED)
#if LSQUIC_KEEP_STREAM_HISTORY
#define KEEP_CLOSED_STREAM_HISTORY 0
#endif
#if KEEP_CLOSED_STREAM_HISTORY
struct stream_history
{
lsquic_stream_id_t shist_stream_id;
enum stream_flags shist_stream_flags;
unsigned char shist_hist_buf[1 << SM_HIST_BITS];
};
#define SHIST_BITS 5
#define SHIST_MASK ((1 << SHIST_BITS) - 1)
#endif
#ifndef KEEP_PACKET_HISTORY
#ifdef NDEBUG
#define KEEP_PACKET_HISTORY 0
#else
#define KEEP_PACKET_HISTORY 16
#endif
#endif
#if KEEP_PACKET_HISTORY
struct packet_el
{
lsquic_time_t time;
enum quic_ft_bit frame_types;
};
struct recent_packets
{
struct packet_el els[KEEP_PACKET_HISTORY];
unsigned idx;
};
#endif
struct stream_id_to_reset
{
STAILQ_ENTRY(stream_id_to_reset) sitr_next;
lsquic_stream_id_t sitr_stream_id;
};
struct full_conn
{
struct lsquic_conn fc_conn;
struct conn_cid_elem fc_cces[2];
struct lsquic_rechist fc_rechist;
struct {
const struct lsquic_stream_if *stream_if;
void *stream_if_ctx;
} fc_stream_ifs[N_STREAM_IFS];
struct lsquic_send_ctl fc_send_ctl;
struct lsquic_conn_public fc_pub;
lsquic_alarmset_t fc_alset;
lsquic_set64_t fc_closed_stream_ids[2];
const struct lsquic_engine_settings
*fc_settings;
struct lsquic_engine_public *fc_enpub;
lsquic_packno_t fc_max_ack_packno;
lsquic_packno_t fc_max_swf_packno;
lsquic_time_t fc_mem_logged_last;
struct {
unsigned max_streams_in;
unsigned max_streams_out;
unsigned max_conn_send;
unsigned max_stream_send;
} fc_cfg;
enum full_conn_flags fc_flags;
/* Number ackable packets received since last ACK was sent: */
unsigned fc_n_slack_akbl;
unsigned fc_n_delayed_streams;
unsigned fc_n_cons_unretx;
lsquic_stream_id_t fc_last_stream_id;
lsquic_stream_id_t fc_max_peer_stream_id;
lsquic_stream_id_t fc_goaway_stream_id;
struct ver_neg fc_ver_neg;
union {
struct client_hsk_ctx client;
struct server_hsk_ctx server;
} fc_hsk_ctx;
#if LSQUIC_CONN_STATS
struct conn_stats fc_stats;
struct conn_stats *fc_last_stats;
#endif
#if KEEP_CLOSED_STREAM_HISTORY
/* Rolling log of histories of closed streams. Older entries are
* overwritten.
*/
struct stream_history fc_stream_histories[1 << SHIST_BITS];
unsigned fc_stream_hist_idx;
#endif
char *fc_errmsg;
#if KEEP_PACKET_HISTORY
struct recent_packets fc_recent_packets[2]; /* 0: in; 1: out */
#endif
STAILQ_HEAD(, stream_id_to_reset)
fc_stream_ids_to_reset;
lsquic_time_t fc_saved_ack_received;
struct network_path fc_path;
unsigned fc_orig_versions; /* Client only */
enum enc_level fc_crypto_enc_level;
struct ack_info fc_ack;
};
static const struct ver_neg server_ver_neg;
#define MAX_ERRMSG 256
#define SET_ERRMSG(conn, ...) do { \
if (!(conn)->fc_errmsg) \
(conn)->fc_errmsg = malloc(MAX_ERRMSG); \
if ((conn)->fc_errmsg) \
snprintf((conn)->fc_errmsg, MAX_ERRMSG, __VA_ARGS__); \
} while (0)
#define ABORT_WITH_FLAG(conn, log_level, flag, ...) do { \
SET_ERRMSG(conn, __VA_ARGS__); \
if (!((conn)->fc_flags & FC_ABORT_COMPLAINED)) \
LSQ_LOG(log_level, "Abort connection: " __VA_ARGS__); \
(conn)->fc_flags |= flag|FC_ABORT_COMPLAINED; \
} while (0)
#define ABORT_ERROR(...) \
ABORT_WITH_FLAG(conn, LSQ_LOG_ERROR, FC_ERROR, __VA_ARGS__)
#define ABORT_WARN(...) \
ABORT_WITH_FLAG(conn, LSQ_LOG_WARN, FC_ERROR, __VA_ARGS__)
static void
idle_alarm_expired (enum alarm_id, void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
ping_alarm_expired (enum alarm_id, void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
handshake_alarm_expired (enum alarm_id, void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
ack_alarm_expired (enum alarm_id, void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static lsquic_stream_t *
new_stream (struct full_conn *conn, lsquic_stream_id_t stream_id,
enum stream_ctor_flags);
static struct lsquic_stream *
new_stream_ext (struct full_conn *, lsquic_stream_id_t, enum stream_if,
enum stream_ctor_flags);
static void
reset_ack_state (struct full_conn *conn);
static int
write_is_possible (struct full_conn *);
static const struct headers_stream_callbacks *headers_callbacks_ptr;
#if KEEP_CLOSED_STREAM_HISTORY
static void
save_stream_history (struct full_conn *conn, const lsquic_stream_t *stream)
{
sm_hist_idx_t idx;
struct stream_history *const shist =
&conn->fc_stream_histories[ conn->fc_stream_hist_idx++ & SHIST_MASK ];
shist->shist_stream_id = stream->id;
shist->shist_stream_flags = stream->stream_flags;
idx = stream->sm_hist_idx & SM_HIST_IDX_MASK;
if ('\0' == stream->sm_hist_buf[ idx ])
memcpy(shist->shist_hist_buf, stream->sm_hist_buf, idx + 1);
else
{
memcpy(shist->shist_hist_buf,
stream->sm_hist_buf + idx, sizeof(stream->sm_hist_buf) - idx);
memcpy(shist->shist_hist_buf + sizeof(shist->shist_hist_buf) - idx,
stream->sm_hist_buf, idx);
}
}
static const struct stream_history *
find_stream_history (const struct full_conn *conn, lsquic_stream_id_t stream_id)
{
const struct stream_history *shist;
const struct stream_history *const shist_end =
conn->fc_stream_histories + (1 << SHIST_BITS);
for (shist = conn->fc_stream_histories; shist < shist_end; ++shist)
if (shist->shist_stream_id == stream_id)
return shist;
return NULL;
}
# define SAVE_STREAM_HISTORY(conn, stream) save_stream_history(conn, stream)
#else
# define SAVE_STREAM_HISTORY(conn, stream)
#endif
#if KEEP_PACKET_HISTORY
static void
recent_packet_hist_new (struct full_conn *conn, unsigned out,
lsquic_time_t time)
{
unsigned idx;
idx = conn->fc_recent_packets[out].idx++ % KEEP_PACKET_HISTORY;
conn->fc_recent_packets[out].els[idx].time = time;
}
static void
recent_packet_hist_frames (struct full_conn *conn, unsigned out,
enum quic_ft_bit frame_types)
{
unsigned idx;
idx = (conn->fc_recent_packets[out].idx - 1) % KEEP_PACKET_HISTORY;
conn->fc_recent_packets[out].els[idx].frame_types |= frame_types;
}
#else
#define recent_packet_hist_new(conn, out, time)
#define recent_packet_hist_frames(conn, out, frames)
#endif
static unsigned
highest_bit_set (unsigned sz)
{
#if __GNUC__
unsigned clz = __builtin_clz(sz);
return 31 - clz;
#else
unsigned n, y;
n = 32;
y = sz >> 16; if (y) { n -= 16; sz = y; }
y = sz >> 8; if (y) { n -= 8; sz = y; }
y = sz >> 4; if (y) { n -= 4; sz = y; }
y = sz >> 2; if (y) { n -= 2; sz = y; }
y = sz >> 1; if (y) return 31 - n + 2;
return 31 - n + sz;
#endif
}
static size_t
calc_mem_used (const struct full_conn *conn)
{
const lsquic_stream_t *stream;
const struct lsquic_hash_elem *el;
size_t size;
size = sizeof(*conn);
size -= sizeof(conn->fc_send_ctl);
size += lsquic_send_ctl_mem_used(&conn->fc_send_ctl);
size += lsquic_hash_mem_used(conn->fc_pub.all_streams);
size += lsquic_malo_mem_used(conn->fc_pub.packet_out_malo);
if (conn->fc_pub.u.gquic.hs)
size += lsquic_headers_stream_mem_used(conn->fc_pub.u.gquic.hs);
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
size += lsquic_stream_mem_used(stream);
}
size += conn->fc_conn.cn_esf.g->esf_mem_used(conn->fc_conn.cn_enc_session);
return size;
}
static void
set_versions (struct full_conn *conn, unsigned versions,
enum lsquic_version *ver)
{
conn->fc_ver_neg.vn_supp = versions;
conn->fc_ver_neg.vn_ver = (ver) ? *ver : highest_bit_set(versions);
conn->fc_ver_neg.vn_buf = lsquic_ver2tag(conn->fc_ver_neg.vn_ver);
conn->fc_conn.cn_version = conn->fc_ver_neg.vn_ver;
conn->fc_conn.cn_pf = select_pf_by_ver(conn->fc_ver_neg.vn_ver);
LSQ_DEBUG("negotiating version %s",
lsquic_ver2str[conn->fc_ver_neg.vn_ver]);
}
static void
init_ver_neg (struct full_conn *conn, unsigned versions,
enum lsquic_version *ver)
{
set_versions(conn, versions, ver);
conn->fc_ver_neg.vn_tag = &conn->fc_ver_neg.vn_buf;
conn->fc_ver_neg.vn_state = VN_START;
}
/* If peer supplies odd values, we abort the connection immediately rather
* that wait for it to finish "naturally" due to inability to send things.
*/
#ifdef NDEBUG
static
#endif
void
lsquic_full_conn_on_peer_config (struct full_conn *conn, unsigned peer_cfcw,
unsigned peer_sfcw, unsigned max_streams_out)
{
lsquic_stream_t *stream;
struct lsquic_hash_elem *el;
LSQ_INFO("Applying peer config: cfcw: %u; sfcw: %u; # streams: %u",
peer_cfcw, peer_sfcw, max_streams_out);
if (peer_cfcw < conn->fc_pub.conn_cap.cc_sent)
{
ABORT_ERROR("peer specified CFCW=%u bytes, which is smaller than "
"the amount of data already sent on this connection (%"PRIu64
" bytes)", peer_cfcw, conn->fc_pub.conn_cap.cc_sent);
return;
}
conn->fc_cfg.max_streams_out = max_streams_out;
conn->fc_pub.conn_cap.cc_max = peer_cfcw;
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
if (0 != lsquic_stream_set_max_send_off(stream, peer_sfcw))
{
ABORT_ERROR("cannot set peer-supplied SFCW=%u on stream %"PRIu64,
peer_sfcw, stream->id);
return;
}
}
conn->fc_cfg.max_stream_send = peer_sfcw;
}
static int
send_smhl (const struct full_conn *conn)
{
uint32_t smhl;
return conn->fc_conn.cn_enc_session
&& 0 == conn->fc_conn.cn_esf.g->esf_get_peer_setting(
conn->fc_conn.cn_enc_session, QTAG_SMHL, &smhl)
&& 1 == smhl;
}
/* Once handshake has been completed, send settings to peer if appropriate.
*/
static void
maybe_send_settings (struct full_conn *conn)
{
struct lsquic_http2_setting settings[2];
unsigned n_settings = 0;
if (conn->fc_settings->es_max_header_list_size && send_smhl(conn))
{
settings[n_settings].id = SETTINGS_MAX_HEADER_LIST_SIZE;
settings[n_settings].value = conn->fc_settings->es_max_header_list_size;
LSQ_DEBUG("sending settings SETTINGS_MAX_HEADER_LIST_SIZE=%u",
settings[n_settings].value);
++n_settings;
}
if (!(conn->fc_flags & FC_SERVER) && !conn->fc_settings->es_support_push)
{
settings[n_settings].id = SETTINGS_ENABLE_PUSH;
settings[n_settings].value = 0;
LSQ_DEBUG("sending settings SETTINGS_ENABLE_PUSH=%u",
settings[n_settings].value);
++n_settings;
}
if (n_settings)
{
if (0 != lsquic_headers_stream_send_settings(conn->fc_pub.u.gquic.hs,
settings, n_settings))
ABORT_ERROR("could not send settings");
}
else
LSQ_DEBUG("not sending any settings");
}
static int
apply_peer_settings (struct full_conn *conn)
{
uint32_t cfcw, sfcw, mids;
unsigned n;
const struct {
uint32_t tag;
uint32_t *val;
const char *tag_str;
} tags[] = {
{ QTAG_CFCW, &cfcw, "CFCW", },
{ QTAG_SFCW, &sfcw, "SFCW", },
{ QTAG_MIDS, &mids, "MIDS", },
};
#ifndef NDEBUG
if (getenv("LSQUIC_TEST_ENGINE_DTOR"))
return 0;
#endif
for (n = 0; n < sizeof(tags) / sizeof(tags[0]); ++n)
if (0 != conn->fc_conn.cn_esf.g->esf_get_peer_setting(
conn->fc_conn.cn_enc_session, tags[n].tag, tags[n].val))
{
LSQ_INFO("peer did not supply value for %s", tags[n].tag_str);
return -1;
}
LSQ_DEBUG("peer settings: CFCW: %u; SFCW: %u; MIDS: %u",
cfcw, sfcw, mids);
lsquic_full_conn_on_peer_config(conn, cfcw, sfcw, mids);
return 0;
}
static const struct conn_iface *full_conn_iface_ptr;
/* gQUIC up to version Q046 has handshake stream 1 and headers stream 3.
* Q050 and later have "crypto streams" -- meaning CRYPTO frames, not
* STREAM frames and no stream IDs -- and headers stream 1.
*/
static lsquic_stream_id_t
headers_stream_id_by_ver (enum lsquic_version version)
{
if (version < LSQVER_050)
return 3;
else
return 1;
}
static lsquic_stream_id_t
headers_stream_id_by_conn (const struct full_conn *conn)
{
return headers_stream_id_by_ver(conn->fc_conn.cn_version);
}
static lsquic_stream_id_t
hsk_stream_id (const struct full_conn *conn)
{
if (conn->fc_conn.cn_version < LSQVER_050)
return 1;
else
/* Use this otherwise invalid stream ID as ID for the gQUIC crypto
* stream.
*/
return (uint64_t) -1;
}
static int
has_handshake_stream (const struct full_conn *conn)
{
return conn->fc_conn.cn_version < LSQVER_050;
}
static int
is_handshake_stream_id (const struct full_conn *conn,
lsquic_stream_id_t stream_id)
{
return conn->fc_conn.cn_version < LSQVER_050 && stream_id == 1;
}
static struct full_conn *
new_conn_common (lsquic_cid_t cid, struct lsquic_engine_public *enpub,
unsigned flags, enum lsquic_version version)
{
struct full_conn *conn;
lsquic_stream_t *headers_stream;
int saved_errno;
assert(0 == (flags & ~(FC_SERVER|FC_HTTP)));
conn = calloc(1, sizeof(*conn));
if (!conn)
return NULL;
headers_stream = NULL;
conn->fc_conn.cn_if = full_conn_iface_ptr;
conn->fc_conn.cn_cces = conn->fc_cces;
conn->fc_conn.cn_cces_mask = 1;
conn->fc_conn.cn_cid = cid;
conn->fc_flags = flags;
conn->fc_enpub = enpub;
conn->fc_pub.enpub = enpub;
conn->fc_pub.mm = &enpub->enp_mm;
conn->fc_pub.lconn = &conn->fc_conn;
conn->fc_pub.send_ctl = &conn->fc_send_ctl;
#if LSQUIC_CONN_STATS
conn->fc_pub.conn_stats = &conn->fc_stats;
#endif
conn->fc_pub.packet_out_malo =
lsquic_malo_create(sizeof(struct lsquic_packet_out));
conn->fc_pub.path = &conn->fc_path;
conn->fc_pub.max_peer_ack_usec = ACK_TIMEOUT;
conn->fc_stream_ifs[STREAM_IF_STD].stream_if = enpub->enp_stream_if;
conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx = enpub->enp_stream_if_ctx;
conn->fc_settings = &enpub->enp_settings;
/* Calculate maximum number of incoming streams using the same mechanism
* and parameters as found in Chrome:
*/
conn->fc_cfg.max_streams_in =
(unsigned) ((float) enpub->enp_settings.es_max_streams_in * 1.1f);
if (conn->fc_cfg.max_streams_in <
enpub->enp_settings.es_max_streams_in + 10)
conn->fc_cfg.max_streams_in =
enpub->enp_settings.es_max_streams_in + 10;
/* `max_streams_out' gets reset when handshake is complete and we
* learn of peer settings. 100 seems like a sane default value
* because it is what other implementations use. In server mode,
* we do not open any streams until the handshake is complete; in
* client mode, we are limited to 98 outgoing requests alongside
* handshake and headers streams.
*/
conn->fc_cfg.max_streams_out = 100;
TAILQ_INIT(&conn->fc_pub.sending_streams);
TAILQ_INIT(&conn->fc_pub.read_streams);
TAILQ_INIT(&conn->fc_pub.write_streams);
TAILQ_INIT(&conn->fc_pub.service_streams);
STAILQ_INIT(&conn->fc_stream_ids_to_reset);
lsquic_conn_cap_init(&conn->fc_pub.conn_cap, LSQUIC_MIN_FCW);
lsquic_alarmset_init(&conn->fc_alset, &conn->fc_conn);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_IDLE, idle_alarm_expired, conn);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_ACK_APP, ack_alarm_expired, conn);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_PING, ping_alarm_expired, conn);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_HANDSHAKE, handshake_alarm_expired, conn);
lsquic_set64_init(&conn->fc_closed_stream_ids[0]);
lsquic_set64_init(&conn->fc_closed_stream_ids[1]);
lsquic_cfcw_init(&conn->fc_pub.cfcw, &conn->fc_pub, conn->fc_settings->es_cfcw);
lsquic_send_ctl_init(&conn->fc_send_ctl, &conn->fc_alset, conn->fc_enpub,
flags & FC_SERVER ? &server_ver_neg : &conn->fc_ver_neg,
&conn->fc_pub, 0);
conn->fc_pub.all_streams = lsquic_hash_create();
if (!conn->fc_pub.all_streams)
goto cleanup_on_error;
lsquic_rechist_init(&conn->fc_rechist, 0, MAX_ACK_RANGES);
if (conn->fc_flags & FC_HTTP)
{
conn->fc_pub.u.gquic.hs = lsquic_headers_stream_new(
!!(conn->fc_flags & FC_SERVER), conn->fc_enpub,
headers_callbacks_ptr,
#if LSQUIC_CONN_STATS
&conn->fc_stats,
#endif
conn);
if (!conn->fc_pub.u.gquic.hs)
goto cleanup_on_error;
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if = lsquic_headers_stream_if;
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if_ctx = conn->fc_pub.u.gquic.hs;
headers_stream = new_stream_ext(conn, headers_stream_id_by_ver(version),
STREAM_IF_HDR,
SCF_CALL_ON_NEW|SCF_DI_AUTOSWITCH|SCF_CRITICAL|SCF_HEADERS);
if (!headers_stream)
goto cleanup_on_error;
}
else
{
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if = enpub->enp_stream_if;
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if_ctx = enpub->enp_stream_if_ctx;
}
if (conn->fc_settings->es_support_push)
conn->fc_flags |= FC_SUPPORT_PUSH;
conn->fc_conn.cn_n_cces = sizeof(conn->fc_cces) / sizeof(conn->fc_cces[0]);
if (conn->fc_settings->es_noprogress_timeout)
conn->fc_flags |= FC_NOPROG_TIMEOUT;
return conn;
cleanup_on_error:
saved_errno = errno;
if (conn->fc_pub.all_streams)
lsquic_hash_destroy(conn->fc_pub.all_streams);
lsquic_rechist_cleanup(&conn->fc_rechist);
if (conn->fc_flags & FC_HTTP)
{
if (conn->fc_pub.u.gquic.hs)
lsquic_headers_stream_destroy(conn->fc_pub.u.gquic.hs);
if (headers_stream)
lsquic_stream_destroy(headers_stream);
}
memset(conn, 0, sizeof(*conn));
free(conn);
errno = saved_errno;
return NULL;
}
struct lsquic_conn *
lsquic_gquic_full_conn_client_new (struct lsquic_engine_public *enpub,
unsigned versions, unsigned flags,
const char *hostname, unsigned short max_packet_size,
int is_ipv4,
const unsigned char *sess_resume, size_t sess_resume_len)
{
struct full_conn *conn;
enum lsquic_version version, sess_resume_version;
lsquic_cid_t cid;
const struct enc_session_funcs_gquic *esf_g;
versions &= (~LSQUIC_IETF_VERSIONS & LSQUIC_SUPPORTED_VERSIONS);
assert(versions);
version = highest_bit_set(versions);
if (sess_resume)
{
sess_resume_version = lsquic_sess_resume_version(sess_resume, sess_resume_len);
if (sess_resume_version < N_LSQVER && ((1 << sess_resume_version) & versions))
version = sess_resume_version;
}
esf_g = select_esf_gquic_by_ver(version);
lsquic_generate_cid_gquic(&cid);
if (!max_packet_size)
{
if (enpub->enp_settings.es_base_plpmtu)
max_packet_size = enpub->enp_settings.es_base_plpmtu;
else if (is_ipv4)
max_packet_size = GQUIC_MAX_IPv4_PACKET_SZ;
else
max_packet_size = GQUIC_MAX_IPv6_PACKET_SZ;
}
conn = new_conn_common(cid, enpub, flags, version);
if (!conn)
return NULL;
init_ver_neg(conn, versions, &version);
conn->fc_path.np_pack_size = max_packet_size;
conn->fc_conn.cn_esf_c = select_esf_common_by_ver(version);
conn->fc_conn.cn_esf.g = esf_g;
conn->fc_conn.cn_enc_session =
conn->fc_conn.cn_esf.g->esf_create_client(&conn->fc_conn, hostname,
cid, conn->fc_enpub, sess_resume, sess_resume_len);
if (!conn->fc_conn.cn_enc_session)
{
LSQ_WARN("could not create enc session: %s", strerror(errno));
conn->fc_conn.cn_if->ci_destroy(&conn->fc_conn);
return NULL;
}
if (conn->fc_flags & FC_HTTP)
conn->fc_last_stream_id = headers_stream_id_by_conn(conn); /* Client goes (3?), 5, 7, 9.... */
else if (has_handshake_stream(conn))
conn->fc_last_stream_id = 1;
else
conn->fc_last_stream_id = (uint64_t) -1; /* +2 will get us to 1 */
conn->fc_hsk_ctx.client.lconn = &conn->fc_conn;
conn->fc_hsk_ctx.client.mm = &enpub->enp_mm;
conn->fc_hsk_ctx.client.ver_neg = &conn->fc_ver_neg;
conn->fc_stream_ifs[STREAM_IF_HSK]
.stream_if = &lsquic_client_hsk_stream_if;
conn->fc_stream_ifs[STREAM_IF_HSK].stream_if_ctx = &conn->fc_hsk_ctx.client;
conn->fc_orig_versions = versions;
if (conn->fc_settings->es_handshake_to)
lsquic_alarmset_set(&conn->fc_alset, AL_HANDSHAKE,
lsquic_time_now() + conn->fc_settings->es_handshake_to);
if (!new_stream_ext(conn, hsk_stream_id(conn), STREAM_IF_HSK,
SCF_CALL_ON_NEW|SCF_DI_AUTOSWITCH|SCF_CRITICAL|SCF_CRYPTO
|(conn->fc_conn.cn_version >= LSQVER_050 ? SCF_CRYPTO_FRAMES : 0)))
{
LSQ_WARN("could not create handshake stream: %s", strerror(errno));
conn->fc_conn.cn_if->ci_destroy(&conn->fc_conn);
return NULL;
}
conn->fc_flags |= FC_CREATED_OK;
LSQ_INFO("Created new client connection");
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "created full connection");
return &conn->fc_conn;
}
static void
full_conn_ci_client_call_on_new (struct lsquic_conn *lconn)
{
struct full_conn *const conn = (struct full_conn *) lconn;
assert(conn->fc_flags & FC_CREATED_OK);
lconn->cn_conn_ctx = conn->fc_stream_ifs[STREAM_IF_STD].stream_if
->on_new_conn(conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx, lconn);
}
/* This function is special in that it peeks into fc_send_ctl. Other functions
* should not do that.
*/
struct lsquic_conn *
lsquic_gquic_full_conn_server_new (struct lsquic_engine_public *enpub,
unsigned flags, lsquic_conn_t *lconn_mini)
{
struct full_conn *conn;
struct mini_conn *mc;
lsquic_conn_t *lconn_full;
lsquic_packet_in_t *packet_in;
lsquic_packet_out_t *packet_out;
lsquic_stream_t *hsk_stream;
lsquic_packno_t next_packno;
mconn_packno_set_t received;
unsigned n;
uint32_t tcid0_val;
int have_errors = 0, tcid0;
int have_outgoing_ack = 0;
mc = (struct mini_conn *) lconn_mini;
conn = new_conn_common(lconn_mini->cn_cid, enpub, flags,
lconn_mini->cn_version);
if (!conn)
return NULL;
lconn_full = &conn->fc_conn;
conn->fc_last_stream_id = 0; /* Server goes 2, 4, 6.... */
if (conn->fc_flags & FC_HTTP)
conn->fc_max_peer_stream_id = headers_stream_id_by_conn(conn);
else if (has_handshake_stream(conn))
conn->fc_max_peer_stream_id = 1;
else
conn->fc_max_peer_stream_id = (uint64_t) -1;
conn->fc_stream_ifs[STREAM_IF_HSK]
.stream_if = &lsquic_server_hsk_stream_if;
conn->fc_stream_ifs[STREAM_IF_HSK].stream_if_ctx = &conn->fc_hsk_ctx.server;
conn->fc_ver_neg.vn_ver = lconn_mini->cn_version;
conn->fc_conn.cn_version = lconn_mini->cn_version;
conn->fc_conn.cn_pf = lconn_mini->cn_pf;
conn->fc_conn.cn_esf_c = lconn_mini->cn_esf_c;
conn->fc_conn.cn_esf.g = lconn_mini->cn_esf.g;
conn->fc_conn.cn_flags |= LSCONN_VER_SET | LSCONN_SERVER;
conn->fc_pub.rtt_stats = mc->mc_rtt_stats;
conn->fc_hsk_ctx.server.lconn = lconn_full;
conn->fc_hsk_ctx.server.enpub = enpub;
/* TODO Optimize: we don't need an actual crypto stream and handler
* on the server side, as we don't do anything with it. We can
* throw out appropriate frames earlier.
*/
/* Adjust offsets in the HANDSHAKE stream: */
hsk_stream = new_stream_ext(conn, hsk_stream_id(conn), STREAM_IF_HSK,
SCF_CALL_ON_NEW|SCF_DI_AUTOSWITCH|SCF_CRITICAL|SCF_CRYPTO
|(conn->fc_conn.cn_version >= LSQVER_050 ? SCF_CRYPTO_FRAMES : 0));
if (!hsk_stream)
{
LSQ_DEBUG("could not create handshake stream: %s", strerror(errno));
conn->fc_conn.cn_if->ci_destroy(&conn->fc_conn);
return NULL;
}
hsk_stream->tosend_off = mc->mc_write_off;
hsk_stream->read_offset = mc->mc_read_off;
if (0 != lsquic_stream_update_sfcw(hsk_stream, mc->mc_write_off))
{
LSQ_WARN("Invalid write offset %u", mc->mc_write_off);
++have_errors;
}
assert(lconn_full->cn_enc_session == NULL);
lconn_full->cn_enc_session = lconn_mini->cn_enc_session;
lconn_mini->cn_enc_session = NULL;
lconn_full->cn_esf_c->esf_set_conn(lconn_full->cn_enc_session,
&conn->fc_conn);
lsquic_send_ctl_verneg_done(&conn->fc_send_ctl);
conn->fc_send_ctl.sc_cur_packno = mc->mc_cur_packno;
lsquic_send_ctl_begin_optack_detection(&conn->fc_send_ctl);
/* Remove those that still exist from the set: they will be marked as
* received during regular processing in ci_packet_in() later on.
*/
received = mc->mc_received_packnos;
TAILQ_FOREACH(packet_in, &mc->mc_packets_in, pi_next)
received &= ~MCONN_PACKET_MASK(packet_in->pi_packno);
for (n = 0; received; ++n)
{
if (received & (1U << n))
/* Setting `now' to zero is OK here, as we should have had at
* least one other packet above.
*/
lsquic_rechist_received(&conn->fc_rechist, n + 1, 0);
received &= ~(1U << n);
}
/* Mini connection sends out packets 1, 2, 3... and so on. It deletes
* packets that have been successfully sent and acked or those that have
* been lost. We take ownership of all packets in mc_packets_out; those
* that are not on the list are recorded in fc_send_ctl.sc_senhist.
*/
next_packno = 0;
while ((packet_out = TAILQ_FIRST(&mc->mc_packets_out)))
{
TAILQ_REMOVE(&mc->mc_packets_out, packet_out, po_next);
/* Holes in the sequence signify ACKed or lost packets */
++next_packno;
for ( ; next_packno < packet_out->po_packno; ++next_packno)
lsquic_senhist_add(&conn->fc_send_ctl.sc_senhist, next_packno);
packet_out->po_path = &conn->fc_path;
if (mc->mc_sent_packnos & MCONN_PACKET_MASK(packet_out->po_packno))
{
LSQ_DEBUG("got sent packet_out %"PRIu64" from mini",
packet_out->po_packno);
if (0 != lsquic_send_ctl_sent_packet(&conn->fc_send_ctl,
packet_out)
&& !have_errors /* Warn once */)
{
++have_errors;
LSQ_WARN("could not add packet %"PRIu64" to sent set: %s",
packet_out->po_packno, strerror(errno));
}
}
else
{
LSQ_DEBUG("got unsent packet_out %"PRIu64" from mini (will send)",
packet_out->po_packno);
lsquic_send_ctl_scheduled_one(&conn->fc_send_ctl, packet_out);
have_outgoing_ack |= packet_out->po_frame_types &
(1 << QUIC_FRAME_ACK);
}
}
assert(lconn_mini->cn_flags & LSCONN_HANDSHAKE_DONE);
lconn_full->cn_flags |= LSCONN_HANDSHAKE_DONE;
lconn_full->cn_flags |= lconn_mini->cn_flags &
LSCONN_PEER_GOING_AWAY /* We are OK with fc_goaway_stream_id = 0 */;
conn->fc_path = mc->mc_path;
if (0 == apply_peer_settings(conn))
{
if (conn->fc_flags & FC_HTTP)
maybe_send_settings(conn);
}
else
++have_errors;
if (0 == have_errors)
{
tcid0 = conn->fc_settings->es_support_tcid0
&& 0 == conn->fc_conn.cn_esf.g->esf_get_peer_setting(
conn->fc_conn.cn_enc_session, QTAG_TCID, &tcid0_val)
&& 0 == tcid0_val;
lsquic_send_ctl_set_tcid0(&conn->fc_send_ctl, tcid0);
if (tcid0)
conn->fc_conn.cn_flags |= LSCONN_TCID0;
conn->fc_flags |= FC_CREATED_OK|FC_FIRST_TICK;
if (conn->fc_conn.cn_version >= LSQVER_046
|| conn->fc_conn.cn_esf.g->esf_get_peer_option(
conn->fc_conn.cn_enc_session, QTAG_NSTP))
{
conn->fc_flags |= FC_NSTP;
lsquic_send_ctl_turn_nstp_on(&conn->fc_send_ctl);
}
LSQ_DEBUG("Calling on_new_conn callback");
lconn_full->cn_conn_ctx = enpub->enp_stream_if->on_new_conn(
enpub->enp_stream_if_ctx, &conn->fc_conn);
/* Now that user code knows about this connection, process incoming
* packets, if any.
*/
while ((packet_in = TAILQ_FIRST(&mc->mc_packets_in)))
{
TAILQ_REMOVE(&mc->mc_packets_in, packet_in, pi_next);
packet_in->pi_flags |= PI_FROM_MINI;
conn->fc_conn.cn_if->ci_packet_in(&conn->fc_conn, packet_in);
lsquic_packet_in_put(conn->fc_pub.mm, packet_in);
}
/* At this point we may have errors, but we promote it anyway: this is
* so that CONNECTION_CLOSE frame can be generated and sent out.
*/
if (have_outgoing_ack)
reset_ack_state(conn);
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE,
lsquic_time_now() + conn->fc_settings->es_idle_conn_to);
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "created full connection");
LSQ_INFO("Created new server connection");
return &conn->fc_conn;
}
else
{
LSQ_DEBUG("hit errors creating connection, return NULL");
conn->fc_conn.cn_if->ci_destroy(&conn->fc_conn);
return NULL;
}
}
static int
is_our_stream (const struct full_conn *conn, const lsquic_stream_t *stream)
{
int is_server = !!(conn->fc_flags & FC_SERVER);
return (1 & stream->id) ^ is_server;
}
static unsigned
count_streams (const struct full_conn *conn, int peer)
{
const lsquic_stream_t *stream;
unsigned count;
int ours;
int is_server;
struct lsquic_hash_elem *el;
peer = !!peer;
is_server = !!(conn->fc_flags & FC_SERVER);
count = 0;
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
ours = (1 & stream->id) ^ is_server;
if (ours ^ peer)
count += !(lsquic_stream_is_closed(stream)
/* When counting peer-initiated streams, do not
* include those that have been reset:
*/
|| (peer && lsquic_stream_is_reset(stream)));
}
return count;
}
enum stream_count { SCNT_ALL, SCNT_PEER, SCNT_CLOSED, SCNT_RESET,
SCNT_RES_UNCLO /* reset and not closed */, N_SCNTS };
static void
collect_stream_counts (const struct full_conn *conn, int peer,
unsigned counts[N_SCNTS])
{
const lsquic_stream_t *stream;
int ours;
int is_server;
struct lsquic_hash_elem *el;
peer = !!peer;
is_server = !!(conn->fc_flags & FC_SERVER);
memset(counts, 0, N_SCNTS * sizeof(counts[0]));
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
++counts[SCNT_ALL];
stream = lsquic_hashelem_getdata(el);
ours = (1 & stream->id) ^ is_server;
if (ours ^ peer)
{
++counts[SCNT_PEER];
counts[SCNT_CLOSED] += lsquic_stream_is_closed(stream);
counts[SCNT_RESET] += !!lsquic_stream_is_reset(stream);
counts[SCNT_RES_UNCLO] += lsquic_stream_is_reset(stream)
&& !lsquic_stream_is_closed(stream);
}
}
}
static void
full_conn_ci_destroy (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
struct lsquic_hash_elem *el;
struct lsquic_stream *stream;
struct stream_id_to_reset *sitr;
LSQ_DEBUG("destroy connection");
conn->fc_flags |= FC_CLOSING;
lsquic_set64_cleanup(&conn->fc_closed_stream_ids[0]);
lsquic_set64_cleanup(&conn->fc_closed_stream_ids[1]);
while ((el = lsquic_hash_first(conn->fc_pub.all_streams)))
{
stream = lsquic_hashelem_getdata(el);
lsquic_hash_erase(conn->fc_pub.all_streams, el);
lsquic_stream_destroy(stream);
}
lsquic_hash_destroy(conn->fc_pub.all_streams);
if (conn->fc_flags & FC_CREATED_OK)
conn->fc_stream_ifs[STREAM_IF_STD].stream_if
->on_conn_closed(&conn->fc_conn);
if (conn->fc_pub.u.gquic.hs)
lsquic_headers_stream_destroy(conn->fc_pub.u.gquic.hs);
lsquic_send_ctl_cleanup(&conn->fc_send_ctl);
lsquic_rechist_cleanup(&conn->fc_rechist);
if (conn->fc_conn.cn_enc_session)
conn->fc_conn.cn_esf.g->esf_destroy(conn->fc_conn.cn_enc_session);
lsquic_malo_destroy(conn->fc_pub.packet_out_malo);
#if LSQUIC_CONN_STATS
LSQ_NOTICE("# ticks: %lu", conn->fc_stats.n_ticks);
LSQ_NOTICE("received %lu packets, of which %lu were not decryptable, %lu were "
"dups and %lu were errors; sent %lu packets, avg stream data per outgoing"
" packet is %lu bytes",
conn->fc_stats.in.packets, conn->fc_stats.in.undec_packets,
conn->fc_stats.in.dup_packets, conn->fc_stats.in.err_packets,
conn->fc_stats.out.packets,
conn->fc_stats.out.stream_data_sz /
(conn->fc_stats.out.packets ? conn->fc_stats.out.packets : 1));
LSQ_NOTICE("ACKs: in: %lu; processed: %lu; merged: %lu",
conn->fc_stats.in.n_acks, conn->fc_stats.in.n_acks_proc,
conn->fc_stats.in.n_acks_merged);
free(conn->fc_last_stats);
#endif
while ((sitr = STAILQ_FIRST(&conn->fc_stream_ids_to_reset)))
{
STAILQ_REMOVE_HEAD(&conn->fc_stream_ids_to_reset, sitr_next);
free(sitr);
}
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "full connection destroyed");
free(conn->fc_errmsg);
free(conn);
}
static void
conn_mark_stream_closed (struct full_conn *conn, lsquic_stream_id_t stream_id)
{ /* Because stream IDs are distributed unevenly -- there is a set of odd
* stream IDs and a set of even stream IDs -- it is more efficient to
* maintain two sets of closed stream IDs.
*/
int idx = stream_id & 1;
stream_id >>= 1;
if (0 != lsquic_set64_add(&conn->fc_closed_stream_ids[idx], stream_id))
ABORT_ERROR("could not add element to set: %s", strerror(errno));
}
static int
conn_is_stream_closed (struct full_conn *conn, lsquic_stream_id_t stream_id)
{
int idx = stream_id & 1;
stream_id >>= 1;
return lsquic_set64_has(&conn->fc_closed_stream_ids[idx], stream_id);
}
static void
set_ack_timer (struct full_conn *conn, lsquic_time_t now)
{
lsquic_alarmset_set(&conn->fc_alset, AL_ACK_APP, now + ACK_TIMEOUT);
LSQ_DEBUG("ACK alarm set to %"PRIu64, now + ACK_TIMEOUT);
}
static void
ack_alarm_expired (enum alarm_id al_id, void *ctx, lsquic_time_t expiry,
lsquic_time_t now)
{
struct full_conn *conn = ctx;
LSQ_DEBUG("ACK timer expired (%"PRIu64" < %"PRIu64"): ACK queued",
expiry, now);
conn->fc_flags |= FC_ACK_QUEUED;
}
static void
try_queueing_ack (struct full_conn *conn, int was_missing, lsquic_time_t now)
{
if (conn->fc_n_slack_akbl >= MAX_RETR_PACKETS_SINCE_LAST_ACK ||
((conn->fc_flags & FC_ACK_HAD_MISS) && was_missing) ||
lsquic_send_ctl_n_stop_waiting(&conn->fc_send_ctl) > 1)
{
lsquic_alarmset_unset(&conn->fc_alset, AL_ACK_APP);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
conn->fc_flags |= FC_ACK_QUEUED;
LSQ_DEBUG("ACK queued: ackable: %u; had_miss: %d; "
"was_missing: %d; n_stop_waiting: %u",
conn->fc_n_slack_akbl,
!!(conn->fc_flags & FC_ACK_HAD_MISS), was_missing,
lsquic_send_ctl_n_stop_waiting(&conn->fc_send_ctl));
}
else if (conn->fc_n_slack_akbl > 0)
set_ack_timer(conn, now);
}
static void
reset_ack_state (struct full_conn *conn)
{
conn->fc_n_slack_akbl = 0;
lsquic_send_ctl_n_stop_waiting_reset(&conn->fc_send_ctl);
conn->fc_flags &= ~FC_ACK_QUEUED;
lsquic_alarmset_unset(&conn->fc_alset, AL_ACK_APP);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
LSQ_DEBUG("ACK state reset");
}
#if 1
# define verify_ack_frame(a, b, c)
#else
static void
verify_ack_frame (struct full_conn *conn, const unsigned char *buf, int bufsz)
{
unsigned i;
int parsed_len;
struct ack_info *ack_info;
const struct lsquic_packno_range *range;
char ack_buf[512];
unsigned buf_off = 0;
int nw;
ack_info = conn->fc_pub.mm->acki;
parsed_len = parse_ack_frame(buf, bufsz, ack_info);
assert(parsed_len == bufsz);
for (range = lsquic_rechist_first(&conn->fc_rechist), i = 0; range;
range = lsquic_rechist_next(&conn->fc_rechist), ++i)
{
assert(i < ack_info->n_ranges);
assert(range->high == ack_info->ranges[i].high);
assert(range->low == ack_info->ranges[i].low);
if (LSQ_LOG_ENABLED(LSQ_LOG_DEBUG))
{
nw = snprintf(ack_buf + buf_off, sizeof(ack_buf) - buf_off,
"[%"PRIu64"-%"PRIu64"]", range->high, range->low);
assert(nw >= 0);
buf_off += nw;
}
}
assert(i == ack_info->n_ranges);
LSQ_DEBUG("Sent ACK frame %s", ack_buf);
}
#endif
static void
full_conn_ci_write_ack (struct lsquic_conn *lconn,
struct lsquic_packet_out *packet_out)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_time_t now;
int has_missing, w;
now = lsquic_time_now();
w = conn->fc_conn.cn_pf->pf_gen_ack_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out),
(gaf_rechist_first_f) lsquic_rechist_first,
(gaf_rechist_next_f) lsquic_rechist_next,
(gaf_rechist_largest_recv_f) lsquic_rechist_largest_recv,
&conn->fc_rechist, now, &has_missing, &packet_out->po_ack2ed,
NULL);
if (w < 0) {
ABORT_ERROR("generating ACK frame failed: %d", errno);
return;
}
#if LSQUIC_CONN_STATS
++conn->fc_stats.out.acks;
#endif
EV_LOG_GENERATED_ACK_FRAME(LSQUIC_LOG_CONN_ID, conn->fc_conn.cn_pf,
packet_out->po_data + packet_out->po_data_sz, w);
verify_ack_frame(conn, packet_out->po_data + packet_out->po_data_sz, w);
lsquic_send_ctl_scheduled_ack(&conn->fc_send_ctl, PNS_APP,
packet_out->po_ack2ed);
packet_out->po_frame_types |= 1 << QUIC_FRAME_ACK;
if (0 != lsquic_packet_out_add_frame(packet_out, conn->fc_pub.mm, 0,
QUIC_FRAME_ACK, packet_out->po_data_sz, w))
{
ABORT_ERROR("adding frame to packet failed: %d", errno);
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, w);
packet_out->po_regen_sz += w;
if (has_missing)
conn->fc_flags |= FC_ACK_HAD_MISS;
else
conn->fc_flags &= ~FC_ACK_HAD_MISS;
LSQ_DEBUG("Put %d bytes of ACK frame into packet on outgoing queue", w);
if (conn->fc_n_cons_unretx >= 20 &&
!lsquic_send_ctl_have_outgoing_retx_frames(&conn->fc_send_ctl))
{
LSQ_DEBUG("schedule WINDOW_UPDATE frame after %u non-retx "
"packets sent", conn->fc_n_cons_unretx);
conn->fc_flags |= FC_SEND_WUF;
}
reset_ack_state(conn);
}
static lsquic_stream_t *
new_stream_ext (struct full_conn *conn, lsquic_stream_id_t stream_id,
enum stream_if if_idx, enum stream_ctor_flags stream_ctor_flags)
{
struct lsquic_stream *stream;
stream = lsquic_stream_new(stream_id, &conn->fc_pub,
conn->fc_stream_ifs[if_idx].stream_if,
conn->fc_stream_ifs[if_idx].stream_if_ctx, conn->fc_settings->es_sfcw,
stream_ctor_flags & SCF_CRYPTO
? 16 * 1024 : conn->fc_cfg.max_stream_send,
stream_ctor_flags);
if (stream)
lsquic_hash_insert(conn->fc_pub.all_streams, &stream->id,
sizeof(stream->id), stream, &stream->sm_hash_el);
return stream;
}
static lsquic_stream_t *
new_stream (struct full_conn *conn, lsquic_stream_id_t stream_id,
enum stream_ctor_flags flags)
{
flags |= SCF_DI_AUTOSWITCH;
if (conn->fc_pub.u.gquic.hs)
flags |= SCF_HTTP;
if (conn->fc_enpub->enp_settings.es_rw_once)
flags |= SCF_DISP_RW_ONCE;
if (conn->fc_enpub->enp_settings.es_delay_onclose)
flags |= SCF_DELAY_ONCLOSE;
return new_stream_ext(conn, stream_id, STREAM_IF_STD, flags);
}
static lsquic_stream_id_t
generate_stream_id (struct full_conn *conn)
{
conn->fc_last_stream_id += 2;
return conn->fc_last_stream_id;
}
static unsigned
full_conn_ci_n_pending_streams (const struct lsquic_conn *lconn)
{
const struct full_conn *conn = (const struct full_conn *) lconn;
return conn->fc_n_delayed_streams;
}
static unsigned
full_conn_ci_cancel_pending_streams (struct lsquic_conn *lconn, unsigned n)
{
struct full_conn *conn = (struct full_conn *) lconn;
if (n > conn->fc_n_delayed_streams)
conn->fc_n_delayed_streams = 0;
else
conn->fc_n_delayed_streams -= n;
return conn->fc_n_delayed_streams;
}
static int
either_side_going_away (const struct full_conn *conn)
{
return (conn->fc_flags & FC_GOING_AWAY)
|| (conn->fc_conn.cn_flags & LSCONN_PEER_GOING_AWAY);
}
static unsigned
full_conn_ci_n_avail_streams (const lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
unsigned stream_count = count_streams(conn, 0);
if (conn->fc_cfg.max_streams_out < stream_count)
return 0;
return conn->fc_cfg.max_streams_out - stream_count;
}
static int
handshake_done_or_doing_sess_resume (const struct full_conn *conn)
{
return (conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE)
|| conn->fc_conn.cn_esf_c->esf_is_sess_resume_enabled(
conn->fc_conn.cn_enc_session);
}
static void
full_conn_ci_make_stream (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
if (handshake_done_or_doing_sess_resume(conn)
&& full_conn_ci_n_avail_streams(lconn) > 0)
{
if (!new_stream(conn, generate_stream_id(conn), SCF_CALL_ON_NEW))
ABORT_ERROR("could not create new stream: %s", strerror(errno));
}
else if (either_side_going_away(conn))
(void) conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_new_stream(
conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx, NULL);
else
{
++conn->fc_n_delayed_streams;
LSQ_DEBUG("delayed stream creation. Backlog size: %u",
conn->fc_n_delayed_streams);
}
}
static lsquic_stream_t *
find_stream_by_id (struct full_conn *conn, lsquic_stream_id_t stream_id)
{
struct lsquic_hash_elem *el;
el = lsquic_hash_find(conn->fc_pub.all_streams, &stream_id, sizeof(stream_id));
if (el)
return lsquic_hashelem_getdata(el);
else
return NULL;
}
static struct lsquic_stream *
full_conn_ci_get_stream_by_id (struct lsquic_conn *lconn,
lsquic_stream_id_t stream_id)
{
struct full_conn *conn = (struct full_conn *) lconn;
struct lsquic_stream *stream;
stream = find_stream_by_id(conn, stream_id);
if (stream && !lsquic_stream_is_closed(stream))
return stream;
else
return NULL;
}
static struct lsquic_engine *
full_conn_ci_get_engine (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
return conn->fc_enpub->enp_engine;
}
static struct network_path *
full_conn_ci_get_path (struct lsquic_conn *lconn, const struct sockaddr *sa)
{
struct full_conn *conn = (struct full_conn *) lconn;
return &conn->fc_path;
}
static unsigned char
full_conn_ci_record_addrs (struct lsquic_conn *lconn, void *peer_ctx,
const struct sockaddr *local_sa, const struct sockaddr *peer_sa)
{
struct full_conn *conn = (struct full_conn *) lconn;
if (NP_IS_IPv6(&conn->fc_path) != (AF_INET6 == peer_sa->sa_family))
lsquic_send_ctl_return_enc_data(&conn->fc_send_ctl);
size_t len = peer_sa->sa_family == AF_INET ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6);
memcpy(conn->fc_path.np_peer_addr, peer_sa, len);
len = local_sa->sa_family == AF_INET ? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6);
memcpy(conn->fc_path.np_local_addr, local_sa, len);
conn->fc_path.np_peer_ctx = peer_ctx;
return 0;
}
static ptrdiff_t
count_zero_bytes (const unsigned char *p, size_t len)
{
const unsigned char *const end = p + len;
while (p < end && 0 == *p)
++p;
return len - (end - p);
}
static unsigned
process_padding_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
len = (size_t) count_zero_bytes(p, len);
EV_LOG_PADDING_FRAME_IN(LSQUIC_LOG_CONN_ID, len);
return len;
}
static void
log_conn_flow_control (struct full_conn *conn)
{
LSQ_DEBUG("connection flow cap: wrote: %"PRIu64
"; max: %"PRIu64, conn->fc_pub.conn_cap.cc_sent,
conn->fc_pub.conn_cap.cc_max);
LSQ_DEBUG("connection flow control window: read: %"PRIu64
"; max: %"PRIu64, conn->fc_pub.cfcw.cf_max_recv_off,
conn->fc_pub.cfcw.cf_recv_off);
}
static unsigned
process_ping_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{ /* This frame causes ACK frame to be queued, but nothing to do here;
* return the length of this frame.
*/
EV_LOG_PING_FRAME_IN(LSQUIC_LOG_CONN_ID);
LSQ_DEBUG("received PING");
if (conn->fc_flags & FC_SERVER)
log_conn_flow_control(conn);
return 1;
}
static int
is_peer_initiated (const struct full_conn *conn, lsquic_stream_id_t stream_id)
{
unsigned is_server = !!(conn->fc_flags & FC_SERVER);
int peer_initiated = (stream_id & 1) == is_server;
return peer_initiated;
}
static void
maybe_schedule_reset_for_stream (struct full_conn *conn, lsquic_stream_id_t stream_id)
{
struct stream_id_to_reset *sitr;
if (conn_is_stream_closed(conn, stream_id))
return;
sitr = malloc(sizeof(*sitr));
if (!sitr)
return;
sitr->sitr_stream_id = stream_id;
STAILQ_INSERT_TAIL(&conn->fc_stream_ids_to_reset, sitr, sitr_next);
conn_mark_stream_closed(conn, stream_id);
}
static unsigned
process_stream_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
stream_frame_t *stream_frame;
lsquic_stream_t *stream;
enum enc_level enc_level;
int parsed_len;
#ifndef LSQUIC_REDO_FAILED_INSERTION
#define LSQUIC_REDO_FAILED_INSERTION 0
#endif
#if LSQUIC_REDO_FAILED_INSERTION
enum lsq_log_level saved_levels[3];
#if defined(__GNUC__) && !defined(__clang__)
/* gcc complains about this -- incorrectly -- in optimized mode */
saved_levels[0] = 0;
saved_levels[1] = 0;
saved_levels[2] = 0;
#endif
int again = 0;
redo:
#endif
stream_frame = lsquic_malo_get(conn->fc_pub.mm->malo.stream_frame);
if (!stream_frame)
{
LSQ_WARN("could not allocate stream frame: %s", strerror(errno));
return 0;
}
parsed_len = conn->fc_conn.cn_pf->pf_parse_stream_frame(p, len,
stream_frame);
if (parsed_len < 0) {
lsquic_malo_put(stream_frame);
return 0;
}
EV_LOG_STREAM_FRAME_IN(LSQUIC_LOG_CONN_ID, stream_frame);
LSQ_DEBUG("Got stream frame for stream #%"PRIu64, stream_frame->stream_id);
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.stream_frames;
conn->fc_stats.in.stream_data_sz += stream_frame->data_frame.df_size;
#endif
enc_level = lsquic_packet_in_enc_level(packet_in);
if (!is_handshake_stream_id(conn, stream_frame->stream_id)
&& enc_level == ENC_LEV_CLEAR)
{
lsquic_malo_put(stream_frame);
ABORT_ERROR("received unencrypted data for stream %"PRIu64,
stream_frame->stream_id);
return 0;
}
if (conn->fc_flags & FC_CLOSING)
{
LSQ_DEBUG("Connection closing: ignore frame");
lsquic_malo_put(stream_frame);
return parsed_len;
}
stream = find_stream_by_id(conn, stream_frame->stream_id);
if (stream)
{
if (lsquic_stream_is_reset(stream))
{
LSQ_DEBUG("stream %"PRIu64" is reset, ignore frame", stream->id);
lsquic_malo_put(stream_frame);
return parsed_len;
}
}
else
{
if (conn_is_stream_closed(conn, stream_frame->stream_id))
{
LSQ_DEBUG("drop frame for closed stream %"PRIu64,
stream_frame->stream_id);
lsquic_malo_put(stream_frame);
return parsed_len;
}
if (is_peer_initiated(conn, stream_frame->stream_id))
{
unsigned in_count = count_streams(conn, 1);
LSQ_DEBUG("number of peer-initiated streams: %u", in_count);
if (in_count >= conn->fc_cfg.max_streams_in)
{
if (!(conn->fc_flags & FC_ABORT_COMPLAINED))
{
unsigned counts[N_SCNTS];
collect_stream_counts(conn, 1, counts);
ABORT_WARN("incoming stream would exceed limit: %u. "
"all: %u; peer: %u; closed: %u; reset: %u; reset "
"and not closed: %u", conn->fc_cfg.max_streams_in,
counts[SCNT_ALL], counts[SCNT_PEER],
counts[SCNT_CLOSED], counts[SCNT_RESET],
counts[SCNT_RES_UNCLO]);
}
lsquic_malo_put(stream_frame);
return 0;
}
if ((conn->fc_flags & FC_GOING_AWAY) &&
stream_frame->stream_id > conn->fc_max_peer_stream_id)
{
LSQ_DEBUG("going away: reset new incoming stream %"PRIu64,
stream_frame->stream_id);
maybe_schedule_reset_for_stream(conn, stream_frame->stream_id);
lsquic_malo_put(stream_frame);
return parsed_len;
}
}
else
{
ABORT_ERROR("frame for never-initiated stream");
lsquic_malo_put(stream_frame);
return 0;
}
stream = new_stream(conn, stream_frame->stream_id, SCF_CALL_ON_NEW);
if (!stream)
{
ABORT_ERROR("cannot create new stream: %s", strerror(errno));
lsquic_malo_put(stream_frame);
return 0;
}
if (stream_frame->stream_id > conn->fc_max_peer_stream_id)
conn->fc_max_peer_stream_id = stream_frame->stream_id;
}
stream_frame->packet_in = lsquic_packet_in_get(packet_in);
if (0 != lsquic_stream_frame_in(stream, stream_frame))
{
ABORT_ERROR("cannot insert stream frame");
#if LSQUIC_REDO_FAILED_INSERTION
if (again++)
{
lsq_log_levels[LSQLM_STREAM] = saved_levels[0];
lsq_log_levels[LSQLM_DI] = saved_levels[1];
lsq_log_levels[LSQLM_CONN] = saved_levels[2];
}
else if (!(LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_STREAM)
&& LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_DI)
&& LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_CONN)))
{
saved_levels[0] = lsq_log_levels[LSQLM_STREAM];
saved_levels[1] = lsq_log_levels[LSQLM_DI];
saved_levels[2] = lsq_log_levels[LSQLM_CONN];
lsq_log_levels[LSQLM_STREAM] = LSQ_LOG_DEBUG;
lsq_log_levels[LSQLM_DI] = LSQ_LOG_DEBUG;
lsq_log_levels[LSQLM_CONN] = LSQ_LOG_DEBUG;
lsquic_stream_dump_state(stream);
LSQ_DEBUG("inserting frame again, this time with debug logging");
goto redo;
}
#endif
return 0;
}
if (lsquic_stream_is_crypto(stream)
&& (stream->sm_qflags & SMQF_WANT_READ)
&& !(conn->fc_flags & FC_SERVER)
&& !(conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE))
{ /* To enable decryption, process handshake stream as soon as its
* data frames are received.
*
* TODO: this does not work when packets are reordered. A more
* flexible solution would defer packet decryption if handshake
* has not been completed yet. Nevertheless, this is good enough
* for now.
*/
lsquic_stream_dispatch_read_events(stream);
}
return parsed_len;
}
static unsigned
process_crypto_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
struct lsquic_stream *stream;
stream_frame_t *stream_frame;
enum enc_level enc_level;
int parsed_len;
stream_frame = lsquic_malo_get(conn->fc_pub.mm->malo.stream_frame);
if (!stream_frame)
{
LSQ_WARN("could not allocate stream frame: %s", strerror(errno));
return 0;
}
parsed_len = conn->fc_conn.cn_pf->pf_parse_crypto_frame(p, len,
stream_frame);
if (parsed_len < 0)
{
lsquic_malo_put(stream_frame);
return 0;
}
enc_level = lsquic_packet_in_enc_level(packet_in);
EV_LOG_CRYPTO_FRAME_IN(LSQUIC_LOG_CONN_ID, stream_frame, enc_level);
LSQ_DEBUG("Got CRYPTO frame on enc level %s", lsquic_enclev2str[enc_level]);
if (enc_level < conn->fc_crypto_enc_level)
{
LSQ_DEBUG("Old enc level: ignore frame");
lsquic_malo_put(stream_frame);
return parsed_len;
}
if (conn->fc_flags & FC_CLOSING)
{
LSQ_DEBUG("Connection closing: ignore frame");
lsquic_malo_put(stream_frame);
return parsed_len;
}
stream = find_stream_by_id(conn, hsk_stream_id(conn));
if (!stream)
{
LSQ_WARN("cannot find handshake stream for CRYPTO frame");
lsquic_malo_put(stream_frame);
return 0;
}
if (enc_level > conn->fc_crypto_enc_level)
{
stream->read_offset = 0;
stream->tosend_off = 0;
conn->fc_crypto_enc_level = enc_level;
LSQ_DEBUG("reset handshake stream offsets, new enc level %u",
(unsigned) enc_level);
}
stream_frame->packet_in = lsquic_packet_in_get(packet_in);
if (0 != lsquic_stream_frame_in(stream, stream_frame))
{
ABORT_ERROR("cannot insert stream frame");
return 0;
}
if ((stream->sm_qflags & SMQF_WANT_READ)
&& !(conn->fc_flags & FC_SERVER)
&& !(conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE))
{
/* XXX what happens for server? */
lsquic_stream_dispatch_read_events(stream);
}
return parsed_len;
}
static unsigned
process_invalid_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
ABORT_ERROR("invalid frame");
return 0;
}
/* Reset locally-initiated streams whose IDs is larger than the stream ID
* specified in received GOAWAY frame.
*/
static void
reset_local_streams_over_goaway (struct full_conn *conn)
{
const unsigned is_server = !!(conn->fc_flags & FC_SERVER);
lsquic_stream_t *stream;
struct lsquic_hash_elem *el;
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
if ((int64_t) stream->id > (int64_t) conn->fc_goaway_stream_id &&
((stream->id & 1) ^ is_server /* Locally initiated? */))
{
lsquic_stream_received_goaway(stream);
}
}
}
static unsigned
process_goaway_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
lsquic_stream_id_t stream_id;
uint32_t error_code;
uint16_t reason_length;
const char *reason;
const int parsed_len = conn->fc_conn.cn_pf->pf_parse_goaway_frame(p, len,
&error_code, &stream_id, &reason_length, &reason);
if (parsed_len < 0)
return 0;
EV_LOG_GOAWAY_FRAME_IN(LSQUIC_LOG_CONN_ID, error_code, stream_id,
reason_length, reason);
LSQ_DEBUG("received GOAWAY frame, last good stream ID: %"PRIu64
", error code: 0x%X, reason: `%.*s'", stream_id, error_code,
reason_length, reason);
if (0 == (conn->fc_conn.cn_flags & LSCONN_PEER_GOING_AWAY))
{
conn->fc_conn.cn_flags |= LSCONN_PEER_GOING_AWAY;
conn->fc_goaway_stream_id = stream_id;
if (conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_goaway_received)
{
LSQ_DEBUG("calling on_goaway_received");
conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_goaway_received(
&conn->fc_conn);
}
else
LSQ_DEBUG("on_goaway_received not registered");
reset_local_streams_over_goaway(conn);
}
else
LSQ_DEBUG("ignore duplicate GOAWAY frame");
return parsed_len;
}
static void
log_invalid_ack_frame (struct full_conn *conn, const unsigned char *p,
int parsed_len, const struct ack_info *acki)
{
char *buf;
buf = malloc(0x1000);
if (!buf)
{
LSQ_WARN("malloc failed");
return;
}
lsquic_senhist_tostr(&conn->fc_send_ctl.sc_senhist, buf, 0x1000);
LSQ_WARN("send history: %s", buf);
lsquic_hexdump(p, parsed_len, buf, 0x1000);
LSQ_WARN("raw ACK frame:\n%s", buf);
lsquic_acki2str(acki, buf, 0x1000);
LSQ_WARN("parsed ACK frame: %s", buf);
free(buf);
}
static int
process_ack (struct full_conn *conn, struct ack_info *acki,
lsquic_time_t received, lsquic_time_t now)
{
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.n_acks_proc;
#endif
LSQ_DEBUG("Processing ACK");
if (0 == lsquic_send_ctl_got_ack(&conn->fc_send_ctl, acki, received, now))
{
if (lsquic_send_ctl_largest_ack2ed(&conn->fc_send_ctl, PNS_APP))
lsquic_rechist_stop_wait(&conn->fc_rechist,
lsquic_send_ctl_largest_ack2ed(&conn->fc_send_ctl, PNS_APP)
+ 1);
return 0;
}
else
{
ABORT_ERROR("Received invalid ACK");
return -1;
}
}
static unsigned
process_ack_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
struct ack_info *new_acki;
int parsed_len;
lsquic_time_t warn_time;
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.n_acks;
#endif
if (conn->fc_flags & FC_HAVE_SAVED_ACK)
new_acki = conn->fc_pub.mm->acki;
else
new_acki = &conn->fc_ack;
parsed_len = conn->fc_conn.cn_pf->pf_parse_ack_frame(p, len, new_acki, 0);
if (parsed_len < 0)
goto err;
if (empty_ack_frame(new_acki))
{
LSQ_DEBUG("Ignore empty ACK frame");
return parsed_len;
}
if (packet_in->pi_packno <= conn->fc_max_ack_packno)
{
LSQ_DEBUG("Ignore old ack (max %"PRIu64")", conn->fc_max_ack_packno);
return parsed_len;
}
new_acki->pns = PNS_APP;
EV_LOG_ACK_FRAME_IN(LSQUIC_LOG_CONN_ID, new_acki);
conn->fc_max_ack_packno = packet_in->pi_packno;
if (new_acki == &conn->fc_ack)
{
LSQ_DEBUG("Saved ACK");
conn->fc_flags |= FC_HAVE_SAVED_ACK;
conn->fc_saved_ack_received = packet_in->pi_received;
}
else
{
if (0 == lsquic_merge_acks(&conn->fc_ack, new_acki))
{
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.n_acks_merged;
#endif
LSQ_DEBUG("merged into saved ACK, getting %s",
(lsquic_acki2str(&conn->fc_ack, conn->fc_pub.mm->ack_str,
MAX_ACKI_STR_SZ), conn->fc_pub.mm->ack_str));
}
else
{
LSQ_DEBUG("could not merge new ACK into saved ACK");
if (0 != process_ack(conn, &conn->fc_ack, packet_in->pi_received,
packet_in->pi_received))
goto err;
conn->fc_ack = *new_acki;
}
conn->fc_saved_ack_received = packet_in->pi_received;
}
return parsed_len;
err:
warn_time = lsquic_time_now();
if (0 == conn->fc_enpub->enp_last_warning[WT_ACKPARSE_FULL]
|| conn->fc_enpub->enp_last_warning[WT_ACKPARSE_FULL]
+ WARNING_INTERVAL < warn_time)
{
conn->fc_enpub->enp_last_warning[WT_ACKPARSE_FULL] = warn_time;
log_invalid_ack_frame(conn, p, parsed_len, new_acki);
}
return 0;
}
static unsigned
process_stop_waiting_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
lsquic_packno_t least, cutoff;
enum packno_bits bits;
int parsed_len;
bits = lsquic_packet_in_packno_bits(packet_in);
if (conn->fc_flags & FC_NSTP)
{
LSQ_DEBUG("NSTP on: ignore STOP_WAITING frame");
parsed_len = conn->fc_conn.cn_pf->pf_skip_stop_waiting_frame(len, bits);
if (parsed_len > 0)
return (unsigned) parsed_len;
else
return 0;
}
parsed_len = conn->fc_conn.cn_pf->pf_parse_stop_waiting_frame(p, len,
packet_in->pi_packno, bits, &least);
if (parsed_len < 0)
return 0;
if (packet_in->pi_packno <= conn->fc_max_swf_packno)
{
LSQ_DEBUG("ignore old STOP_WAITING frame");
return parsed_len;
}
LSQ_DEBUG("Got STOP_WAITING frame, least unacked: %"PRIu64, least);
EV_LOG_STOP_WAITING_FRAME_IN(LSQUIC_LOG_CONN_ID, least);
if (least > packet_in->pi_packno)
{
ABORT_ERROR("received invalid STOP_WAITING: %"PRIu64" is larger "
"than the packet number%"PRIu64, least, packet_in->pi_packno);
return 0;
}
cutoff = lsquic_rechist_cutoff(&conn->fc_rechist);
if (cutoff && least < cutoff)
{
ABORT_ERROR("received invalid STOP_WAITING: %"PRIu64" is smaller "
"than the cutoff %"PRIu64, least, cutoff);
return 0;
}
conn->fc_max_swf_packno = packet_in->pi_packno;
lsquic_rechist_stop_wait(&conn->fc_rechist, least);
return parsed_len;
}
static unsigned
process_blocked_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
lsquic_stream_id_t stream_id;
struct lsquic_stream *stream;
const int parsed_len = conn->fc_conn.cn_pf->pf_parse_blocked_frame(p, len,
&stream_id);
if (parsed_len < 0)
return 0;
EV_LOG_BLOCKED_FRAME_IN(LSQUIC_LOG_CONN_ID, stream_id);
LSQ_DEBUG("Peer reports stream %"PRIu64" as blocked", stream_id);
if (stream_id)
{
stream = find_stream_by_id(conn, stream_id);
if (stream)
lsquic_stream_peer_blocked_gquic(stream);
}
else
conn->fc_flags |= FC_SEND_WUF;
return parsed_len;
}
static unsigned
process_connection_close_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
uint64_t error_code;
uint16_t reason_len;
uint8_t reason_off;
int parsed_len;
parsed_len = conn->fc_conn.cn_pf->pf_parse_connect_close_frame(p, len,
NULL, &error_code, &reason_len, &reason_off);
if (parsed_len < 0)
return 0;
EV_LOG_CONNECTION_CLOSE_FRAME_IN(LSQUIC_LOG_CONN_ID, error_code,
(int) reason_len, (const char *) p + reason_off);
LSQ_INFO("Received CONNECTION_CLOSE frame (code: %"PRIu64"; reason: %.*s)",
error_code, (int) reason_len, (const char *) p + reason_off);
if (conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_conncloseframe_received)
conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_conncloseframe_received(
&conn->fc_conn, -1, error_code, (const char *) p + reason_off, reason_len);
conn->fc_flags |= FC_RECV_CLOSE|FC_CLOSING;
return parsed_len;
}
static unsigned
process_rst_stream_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
lsquic_stream_id_t stream_id;
uint64_t offset, error_code;
lsquic_stream_t *stream;
const int parsed_len = conn->fc_conn.cn_pf->pf_parse_rst_frame(p, len,
&stream_id, &offset, &error_code);
if (parsed_len < 0)
return 0;
EV_LOG_RST_STREAM_FRAME_IN(LSQUIC_LOG_CONN_ID, stream_id, offset,
error_code);
LSQ_DEBUG("Got RST_STREAM; stream: %"PRIu64"; offset: 0x%"PRIX64, stream_id,
offset);
if (0 == stream_id)
{ /* Follow reference implementation and ignore this apparently
* invalid frame.
*/
return parsed_len;
}
stream = find_stream_by_id(conn, stream_id);
if (stream && lsquic_stream_is_critical(stream))
{
ABORT_ERROR("received reset on static stream %"PRIu64, stream_id);
return 0;
}
if (!stream)
{
if (conn_is_stream_closed(conn, stream_id))
{
LSQ_DEBUG("got reset frame for closed stream %"PRIu64, stream_id);
return parsed_len;
}
if (!is_peer_initiated(conn, stream_id))
{
ABORT_ERROR("received reset for never-initiated stream %"PRIu64,
stream_id);
return 0;
}
stream = new_stream(conn, stream_id, SCF_CALL_ON_NEW);
if (!stream)
{
ABORT_ERROR("cannot create new stream: %s", strerror(errno));
return 0;
}
if (stream_id > conn->fc_max_peer_stream_id)
conn->fc_max_peer_stream_id = stream_id;
}
if (0 != lsquic_stream_rst_in(stream, offset, error_code))
{
ABORT_ERROR("received invalid RST_STREAM");
return 0;
}
return parsed_len;
}
static unsigned
process_window_update_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
lsquic_stream_id_t stream_id;
uint64_t offset;
const int parsed_len =
conn->fc_conn.cn_pf->pf_parse_window_update_frame(p, len,
&stream_id, &offset);
if (parsed_len < 0)
return 0;
EV_LOG_WINDOW_UPDATE_FRAME_IN(LSQUIC_LOG_CONN_ID, stream_id, offset);
if (stream_id)
{
lsquic_stream_t *stream = find_stream_by_id(conn, stream_id);
if (stream)
{
LSQ_DEBUG("Got window update frame, stream: %"PRIu64
"; offset: 0x%"PRIX64, stream_id, offset);
lsquic_stream_window_update(stream, offset);
}
else /* Perhaps a result of lost packets? */
LSQ_DEBUG("Got window update frame for non-existing stream %"PRIu64
" (offset: 0x%"PRIX64")", stream_id, offset);
}
else if (offset > conn->fc_pub.conn_cap.cc_max)
{
conn->fc_pub.conn_cap.cc_max = offset;
assert(conn->fc_pub.conn_cap.cc_max >= conn->fc_pub.conn_cap.cc_sent);
LSQ_DEBUG("Connection WUF, new offset 0x%"PRIX64, offset);
}
else
LSQ_DEBUG("Throw ouw duplicate connection WUF");
return parsed_len;
}
typedef unsigned (*process_frame_f)(
struct full_conn *, lsquic_packet_in_t *, const unsigned char *p, size_t);
static process_frame_f const process_frames[N_QUIC_FRAMES] =
{
[QUIC_FRAME_ACK] = process_ack_frame,
[QUIC_FRAME_BLOCKED] = process_blocked_frame,
[QUIC_FRAME_CONNECTION_CLOSE] = process_connection_close_frame,
[QUIC_FRAME_CRYPTO] = process_crypto_frame,
[QUIC_FRAME_GOAWAY] = process_goaway_frame,
[QUIC_FRAME_INVALID] = process_invalid_frame,
[QUIC_FRAME_PADDING] = process_padding_frame,
[QUIC_FRAME_PING] = process_ping_frame,
[QUIC_FRAME_RST_STREAM] = process_rst_stream_frame,
[QUIC_FRAME_STOP_WAITING] = process_stop_waiting_frame,
[QUIC_FRAME_STREAM] = process_stream_frame,
[QUIC_FRAME_WINDOW_UPDATE] = process_window_update_frame,
};
static unsigned
process_packet_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
enum quic_frame_type type;
type = conn->fc_conn.cn_pf->pf_parse_frame_type(p, len);
packet_in->pi_frame_types |= 1 << type;
recent_packet_hist_frames(conn, 0, 1 << type);
return process_frames[type](conn, packet_in, p, len);
}
static void
process_ver_neg_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
int s;
struct ver_iter vi;
lsquic_ver_tag_t ver_tag;
enum lsquic_version version;
unsigned versions = 0;
LSQ_DEBUG("Processing version-negotiation packet");
if (conn->fc_ver_neg.vn_state != VN_START)
{
LSQ_DEBUG("ignore a likely duplicate version negotiation packet");
return;
}
for (s = lsquic_packet_in_ver_first(packet_in, &vi, &ver_tag); s;
s = lsquic_packet_in_ver_next(&vi, &ver_tag))
{
version = lsquic_tag2ver(ver_tag);
if (version < N_LSQVER)
{
versions |= 1 << version;
LSQ_DEBUG("server supports version %s", lsquic_ver2str[version]);
EV_LOG_VER_NEG(LSQUIC_LOG_CONN_ID,
"supports", lsquic_ver2str[version]);
}
}
if (versions & (1 << conn->fc_ver_neg.vn_ver))
{
ABORT_ERROR("server replied with version we support: %s",
lsquic_ver2str[conn->fc_ver_neg.vn_ver]);
return;
}
versions &= conn->fc_ver_neg.vn_supp;
if (0 == versions)
{
conn->fc_flags |= FC_HSK_FAILED;
ABORT_ERROR("client does not support any of the server-specified "
"versions");
return;
}
set_versions(conn, versions, NULL);
conn->fc_ver_neg.vn_state = VN_IN_PROGRESS;
lsquic_send_ctl_expire_all(&conn->fc_send_ctl);
}
static void
reconstruct_packet_number (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
lsquic_packno_t cur_packno, max_packno;
enum packno_bits bits;
unsigned packet_len;
cur_packno = packet_in->pi_packno;
max_packno = lsquic_rechist_largest_packno(&conn->fc_rechist);
bits = lsquic_packet_in_packno_bits(packet_in);
packet_len = conn->fc_conn.cn_pf->pf_packno_bits2len(bits);
packet_in->pi_packno = lsquic_restore_packno(cur_packno, packet_len,
max_packno);
LSQ_DEBUG("reconstructed (bits: %u, packno: %"PRIu64", max: %"PRIu64") "
"to %"PRIu64"", bits, cur_packno, max_packno, packet_in->pi_packno);
}
static enum dec_packin
conn_decrypt_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
return conn->fc_conn.cn_esf_c->esf_decrypt_packet(
conn->fc_conn.cn_enc_session, conn->fc_enpub,
&conn->fc_conn, packet_in);
}
static void
parse_regular_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
const unsigned char *p, *pend;
unsigned len;
p = packet_in->pi_data + packet_in->pi_header_sz;
pend = packet_in->pi_data + packet_in->pi_data_sz;
while (p < pend)
{
len = process_packet_frame(conn, packet_in, p, pend - p);
if (len > 0)
p += len;
else
{
ABORT_ERROR("Error parsing frame");
break;
}
}
}
static int
conn_is_stateless_reset (const struct full_conn *conn,
const struct lsquic_packet_in *packet_in)
{
return packet_in->pi_data_sz > SRST_LENGTH
&& 0 == conn->fc_conn.cn_esf_c->esf_verify_reset_token(
conn->fc_conn.cn_enc_session,
packet_in->pi_data + packet_in->pi_data_sz - SRST_LENGTH,
SRST_LENGTH);
}
static int
process_regular_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
enum received_st st;
enum quic_ft_bit frame_types;
int was_missing;
if (conn->fc_conn.cn_version < LSQVER_050)
{
reconstruct_packet_number(conn, packet_in);
EV_LOG_PACKET_IN(LSQUIC_LOG_CONN_ID, packet_in);
}
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.packets;
#endif
/* The packet is decrypted before receive history is updated. This is
* done to make sure that a bad packet won't occupy a slot in receive
* history and subsequent good packet won't be marked as a duplicate.
*/
if (0 == (packet_in->pi_flags & PI_DECRYPTED) &&
DECPI_OK != conn_decrypt_packet(conn, packet_in))
{
if (conn_is_stateless_reset(conn, packet_in))
{
LSQ_INFO("received public reset packet: aborting connection");
conn->fc_flags |= FC_GOT_PRST;
return -1;
}
else
{
LSQ_INFO("could not decrypt packet");
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.undec_packets;
#endif
return 0;
}
}
if (conn->fc_conn.cn_version >= LSQVER_050)
EV_LOG_PACKET_IN(LSQUIC_LOG_CONN_ID, packet_in);
st = lsquic_rechist_received(&conn->fc_rechist, packet_in->pi_packno,
packet_in->pi_received);
switch (st) {
case REC_ST_OK:
parse_regular_packet(conn, packet_in);
if (0 == (conn->fc_flags & (FC_ACK_QUEUED|FC_GOT_SREJ)))
{
frame_types = packet_in->pi_frame_types;
if ((conn->fc_flags & FC_GOING_AWAY)
&& lsquic_hash_count(conn->fc_pub.all_streams) <= N_SPECIAL_STREAMS)
{
/* Ignore PING frames if we are going away and there are no
* active streams. (HANDSHAKE and HEADERS streams are the
* two streams that are always in the all_streams hash).
*/
frame_types &= ~(1 << QUIC_FRAME_PING);
}
was_missing = packet_in->pi_packno !=
lsquic_rechist_largest_packno(&conn->fc_rechist);
conn->fc_n_slack_akbl += !!(frame_types & GQUIC_FRAME_ACKABLE_MASK);
try_queueing_ack(conn, was_missing, packet_in->pi_received);
}
else if (conn->fc_flags & FC_GOT_SREJ)
conn->fc_flags &= ~FC_GOT_SREJ;
return 0;
case REC_ST_DUP:
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.dup_packets;
#endif
LSQ_INFO("packet %"PRIu64" is a duplicate", packet_in->pi_packno);
return 0;
default:
assert(0);
/* Fall through */
case REC_ST_ERR:
#if LSQUIC_CONN_STATS
++conn->fc_stats.in.err_packets;
#endif
LSQ_INFO("error processing packet %"PRIu64, packet_in->pi_packno);
return -1;
}
}
/* TODO: Possible optimization: in server mode, we do not perform version
* negotiation. We can use different functions in client mode (this
* function) and server mode (a different, faster function that ignores
* version flags).
*/
static int
process_incoming_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
int is_prst, is_verneg;
recent_packet_hist_new(conn, 0, packet_in->pi_received);
LSQ_DEBUG("Processing packet %"PRIu64, packet_in->pi_packno);
is_prst = lsquic_packet_in_is_gquic_prst(packet_in);
is_verneg = lsquic_packet_in_is_verneg(packet_in);
/* See flowchart in Section 4.1 of [draft-ietf-quic-transport-00]. We test
* for the common case first.
*/
if (0 == is_prst && 0 == is_verneg)
{
if (conn->fc_ver_neg.vn_tag)
{
assert(conn->fc_ver_neg.vn_state != VN_END);
conn->fc_ver_neg.vn_state = VN_END;
conn->fc_ver_neg.vn_tag = NULL;
conn->fc_conn.cn_version = conn->fc_ver_neg.vn_ver;
conn->fc_conn.cn_flags |= LSCONN_VER_SET;
assert(!(conn->fc_flags & FC_NSTP)); /* This bit off at start */
if (conn->fc_conn.cn_version >= LSQVER_046
|| conn->fc_settings->es_support_nstp)
{
conn->fc_flags |= FC_NSTP;
lsquic_send_ctl_turn_nstp_on(&conn->fc_send_ctl);
}
LSQ_DEBUG("end of version negotiation: agreed upon %s",
lsquic_ver2str[conn->fc_ver_neg.vn_ver]);
lsquic_send_ctl_verneg_done(&conn->fc_send_ctl);
EV_LOG_VER_NEG(LSQUIC_LOG_CONN_ID,
"agreed", lsquic_ver2str[conn->fc_ver_neg.vn_ver]);
}
return process_regular_packet(conn, packet_in);
}
else if (is_prst)
{
LSQ_INFO("received public reset packet: aborting connection");
conn->fc_flags |= FC_GOT_PRST;
return -1;
}
else
{
if (conn->fc_flags & FC_SERVER)
return process_regular_packet(conn, packet_in);
else if (conn->fc_ver_neg.vn_tag)
{
process_ver_neg_packet(conn, packet_in);
return 0;
}
else
{
LSQ_DEBUG("unexpected version negotiation packet: ignore it");
return 0;
}
}
}
static void
idle_alarm_expired (enum alarm_id al_id, void *ctx, lsquic_time_t expiry,
lsquic_time_t now)
{
struct full_conn *conn = ctx;
if ((conn->fc_flags & FC_NOPROG_TIMEOUT)
&& conn->fc_pub.last_prog + conn->fc_enpub->enp_noprog_timeout < now)
{
LSQ_DEBUG("connection timed out due to lack of progress");
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "connection timed out due to "
"lack of progress");
/* Different flag so that CONNECTION_CLOSE frame is sent */
conn->fc_flags |= FC_ABORTED;
}
else
{
LSQ_DEBUG("connection timed out");
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "connection timed out");
conn->fc_flags |= FC_TIMED_OUT;
}
}
static void
handshake_alarm_expired (enum alarm_id al_id, void *ctx,
lsquic_time_t expiry, lsquic_time_t now)
{
struct full_conn *conn = ctx;
LSQ_DEBUG("connection timed out: handshake timed out");
conn->fc_flags |= FC_TIMED_OUT;
}
static void
ping_alarm_expired (enum alarm_id al_id, void *ctx, lsquic_time_t expiry,
lsquic_time_t now)
{
struct full_conn *conn = ctx;
LSQ_DEBUG("Ping alarm rang: schedule PING frame to be generated");
conn->fc_flags |= FC_SEND_PING;
}
static lsquic_packet_out_t *
get_writeable_packet (struct full_conn *conn, unsigned need_at_least)
{
lsquic_packet_out_t *packet_out;
int is_err;
packet_out = lsquic_send_ctl_get_writeable_packet(&conn->fc_send_ctl,
PNS_APP, need_at_least, &conn->fc_path, 0, &is_err);
if (!packet_out && is_err)
ABORT_ERROR("cannot allocate packet: %s", strerror(errno));
return packet_out;
}
static int
generate_wuf_stream (struct full_conn *conn, lsquic_stream_t *stream)
{
lsquic_packet_out_t *packet_out = get_writeable_packet(conn, GQUIC_WUF_SZ);
if (!packet_out)
return 0;
const uint64_t recv_off = lsquic_stream_fc_recv_off(stream);
int sz = conn->fc_conn.cn_pf->pf_gen_window_update_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), stream->id, recv_off);
if (sz < 0) {
ABORT_ERROR("gen_window_update_frame failed");
return 0;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_WINDOW_UPDATE;
LSQ_DEBUG("wrote WUF: stream %"PRIu64"; offset 0x%"PRIX64, stream->id,
recv_off);
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID,
"wrote WUF: stream %"PRIu64"; offset 0x%"PRIX64, stream->id, recv_off);
return 1;
}
static void
generate_wuf_conn (struct full_conn *conn)
{
assert(conn->fc_flags & FC_SEND_WUF);
lsquic_packet_out_t *packet_out = get_writeable_packet(conn, GQUIC_WUF_SZ);
if (!packet_out)
return;
const uint64_t recv_off = lsquic_cfcw_get_fc_recv_off(&conn->fc_pub.cfcw);
int sz = conn->fc_conn.cn_pf->pf_gen_window_update_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), 0, recv_off);
if (sz < 0) {
ABORT_ERROR("gen_window_update_frame failed");
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_WINDOW_UPDATE;
conn->fc_flags &= ~FC_SEND_WUF;
LSQ_DEBUG("wrote connection WUF: offset 0x%"PRIX64, recv_off);
}
static void
maybe_close_conn (struct full_conn *conn)
{
#ifndef NDEBUG
struct lsquic_stream *stream;
struct lsquic_hash_elem *el;
#endif
const unsigned n_special_streams = N_SPECIAL_STREAMS
- !(conn->fc_flags & FC_HTTP);
if ((conn->fc_flags & (FC_CLOSING|FC_GOAWAY_SENT|FC_SERVER))
== (FC_GOAWAY_SENT|FC_SERVER)
&& lsquic_hash_count(conn->fc_pub.all_streams) == n_special_streams)
{
#ifndef NDEBUG
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
assert(stream->sm_bflags & (SMBF_CRYPTO|SMBF_HEADERS));
}
#endif
conn->fc_flags |= FC_RECV_CLOSE; /* Fake -- trigger "ok to close" */
conn->fc_flags |= FC_CLOSING;
LSQ_DEBUG("closing connection: GOAWAY sent and no responses remain");
}
}
static void
generate_goaway_frame (struct full_conn *conn)
{
int reason_len = 0;
lsquic_packet_out_t *packet_out =
get_writeable_packet(conn, GQUIC_GOAWAY_FRAME_SZ + reason_len);
if (!packet_out)
return;
int sz = conn->fc_conn.cn_pf->pf_gen_goaway_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), 0, conn->fc_max_peer_stream_id,
NULL, reason_len);
if (sz < 0) {
ABORT_ERROR("gen_goaway_frame failed");
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_GOAWAY;
conn->fc_flags &= ~FC_SEND_GOAWAY;
conn->fc_flags |= FC_GOAWAY_SENT;
LSQ_DEBUG("wrote GOAWAY frame: stream id: %"PRIu64,
conn->fc_max_peer_stream_id);
maybe_close_conn(conn);
}
static void
generate_connection_close_packet (struct full_conn *conn)
{
lsquic_packet_out_t *packet_out;
packet_out = lsquic_send_ctl_new_packet_out(&conn->fc_send_ctl, 0, PNS_APP,
&conn->fc_path);
if (!packet_out)
{
ABORT_ERROR("cannot allocate packet: %s", strerror(errno));
return;
}
lsquic_send_ctl_scheduled_one(&conn->fc_send_ctl, packet_out);
int sz = conn->fc_conn.cn_pf->pf_gen_connect_close_frame(packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), 0, 16 /* PEER_GOING_AWAY */,
NULL, 0);
if (sz < 0) {
ABORT_ERROR("generate_connection_close_packet failed");
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_CONNECTION_CLOSE;
LSQ_DEBUG("generated CONNECTION_CLOSE frame in its own packet");
}
static int
generate_blocked_frame (struct full_conn *conn, lsquic_stream_id_t stream_id)
{
lsquic_packet_out_t *packet_out =
get_writeable_packet(conn, GQUIC_BLOCKED_FRAME_SZ);
if (!packet_out)
return 0;
int sz = conn->fc_conn.cn_pf->pf_gen_blocked_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), stream_id);
if (sz < 0) {
ABORT_ERROR("gen_blocked_frame failed");
return 0;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_BLOCKED;
LSQ_DEBUG("wrote blocked frame: stream %"PRIu64, stream_id);
return 1;
}
static int
generate_stream_blocked_frame (struct full_conn *conn, lsquic_stream_t *stream)
{
if (generate_blocked_frame(conn, stream->id))
{
lsquic_stream_blocked_frame_sent(stream);
return 1;
}
else
return 0;
}
static int
generate_rst_stream_frame (struct full_conn *conn, lsquic_stream_t *stream)
{
lsquic_packet_out_t *packet_out;
int sz, s;
packet_out = get_writeable_packet(conn, GQUIC_RST_STREAM_SZ);
if (!packet_out)
return 0;
/* TODO Possible optimization: instead of using stream->tosend_off as the
* offset, keep track of the offset that was actually sent: include it
* into frame_rec and update a new per-stream "maximum offset actually
* sent" field. Then, if a stream is reset, the connection cap can be
* increased.
*/
sz = conn->fc_conn.cn_pf->pf_gen_rst_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), stream->id,
stream->tosend_off, stream->error_code);
if (sz < 0) {
ABORT_ERROR("gen_rst_frame failed");
return 0;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_RST_STREAM;
s = lsquic_packet_out_add_stream(packet_out, conn->fc_pub.mm, stream,
QUIC_FRAME_RST_STREAM, packet_out->po_data_sz, sz);
if (s != 0)
{
ABORT_ERROR("adding stream to packet failed: %s", strerror(errno));
return 0;
}
lsquic_stream_rst_frame_sent(stream);
LSQ_DEBUG("wrote RST: stream %"PRIu64"; offset 0x%"PRIX64"; error code "
"%"PRIu64, stream->id, stream->tosend_off, stream->error_code);
return 1;
}
static void
generate_ping_frame (struct full_conn *conn)
{
lsquic_packet_out_t *packet_out = get_writeable_packet(conn, 1);
if (!packet_out)
{
LSQ_DEBUG("cannot get writeable packet for PING frame");
return;
}
int sz = conn->fc_conn.cn_pf->pf_gen_ping_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out));
if (sz < 0) {
ABORT_ERROR("gen_ping_frame failed");
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_PING;
LSQ_DEBUG("wrote PING frame");
if (!(conn->fc_flags & FC_SERVER))
log_conn_flow_control(conn);
}
static void
generate_stop_waiting_frame (struct full_conn *conn)
{
assert(conn->fc_flags & FC_SEND_STOP_WAITING);
int sz;
unsigned packnum_len;
lsquic_packno_t least_unacked;
lsquic_packet_out_t *packet_out;
/* Get packet that has room for the minimum size STOP_WAITING frame: */
packnum_len = conn->fc_conn.cn_pf->pf_packno_bits2len(GQUIC_PACKNO_LEN_1);
packet_out = get_writeable_packet(conn, 1 + packnum_len);
if (!packet_out)
return;
/* Now calculate number of bytes we really need. If there is not enough
* room in the current packet, get a new one.
*/
packnum_len = conn->fc_conn.cn_pf->pf_packno_bits2len(
lsquic_packet_out_packno_bits(packet_out));
if ((unsigned) lsquic_packet_out_avail(packet_out) < 1 + packnum_len)
{
packet_out = get_writeable_packet(conn, 1 + packnum_len);
if (!packet_out)
return;
/* Here, a new packet has been allocated, The number of bytes needed
* to represent packet number in the STOP_WAITING frame may have
* increased. However, this does not matter, because the newly
* allocated packet must have room for a STOP_WAITING frame of any
* size.
*/
}
least_unacked = lsquic_send_ctl_smallest_unacked(&conn->fc_send_ctl);
sz = conn->fc_conn.cn_pf->pf_gen_stop_waiting_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), packet_out->po_packno,
lsquic_packet_out_packno_bits(packet_out), least_unacked);
if (sz < 0) {
ABORT_ERROR("gen_stop_waiting_frame failed");
return;
}
if (0 != lsquic_packet_out_add_frame(packet_out, conn->fc_pub.mm, 0,
QUIC_FRAME_STOP_WAITING, packet_out->po_data_sz, sz))
{
ABORT_ERROR("adding frame to packet failed: %d", errno);
return;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_regen_sz += sz;
packet_out->po_frame_types |= 1 << QUIC_FRAME_STOP_WAITING;
conn->fc_flags &= ~FC_SEND_STOP_WAITING;
LSQ_DEBUG("wrote STOP_WAITING frame: least unacked: %"PRIu64,
least_unacked);
EV_LOG_GENERATED_STOP_WAITING_FRAME(LSQUIC_LOG_CONN_ID, least_unacked);
}
static int
process_stream_ready_to_send (struct full_conn *conn, lsquic_stream_t *stream)
{
int r = 1;
if (stream->sm_qflags & SMQF_SEND_WUF)
r &= generate_wuf_stream(conn, stream);
if (stream->sm_qflags & SMQF_SEND_BLOCKED)
r &= generate_stream_blocked_frame(conn, stream);
if (stream->sm_qflags & SMQF_SEND_RST)
r &= generate_rst_stream_frame(conn, stream);
return r;
}
static void
process_streams_ready_to_send (struct full_conn *conn)
{
lsquic_stream_t *stream;
struct stream_prio_iter spi;
assert(!TAILQ_EMPTY(&conn->fc_pub.sending_streams));
lsquic_spi_init(&spi, TAILQ_FIRST(&conn->fc_pub.sending_streams),
TAILQ_LAST(&conn->fc_pub.sending_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_send_stream),
&conn->fc_pub, "send", NULL, NULL);
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
if (!process_stream_ready_to_send(conn, stream))
break;
}
/* Return true if packetized, false otherwise */
static int
packetize_standalone_stream_reset (struct full_conn *conn, lsquic_stream_id_t stream_id)
{
lsquic_packet_out_t *packet_out;
int sz;
packet_out = get_writeable_packet(conn, GQUIC_RST_STREAM_SZ);
if (!packet_out)
return 0;
sz = conn->fc_conn.cn_pf->pf_gen_rst_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), stream_id,
0, 0x10 /* QUIC_PEER_GOING_AWAY */);
if (sz < 0) {
ABORT_ERROR("gen_rst_frame failed");
return 0;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_RST_STREAM;
LSQ_DEBUG("generated standalone RST_STREAM frame for stream %"PRIu64,
stream_id);
return 1;
}
static void
packetize_standalone_stream_resets (struct full_conn *conn)
{
struct stream_id_to_reset *sitr;
while ((sitr = STAILQ_FIRST(&conn->fc_stream_ids_to_reset)))
if (packetize_standalone_stream_reset(conn, sitr->sitr_stream_id))
{
STAILQ_REMOVE_HEAD(&conn->fc_stream_ids_to_reset, sitr_next);
free(sitr);
}
else
break;
}
static void
create_delayed_streams (struct full_conn *conn)
{
unsigned stream_count, avail, i;
struct lsquic_stream **new_streams;
stream_count = count_streams(conn, 0);
if (stream_count >= conn->fc_cfg.max_streams_out)
return;
avail = conn->fc_cfg.max_streams_out - stream_count;
if (conn->fc_n_delayed_streams < avail)
avail = conn->fc_n_delayed_streams;
if (avail == 0)
return;
new_streams = malloc(sizeof(new_streams[0]) * avail);
if (!new_streams)
{
ABORT_WARN("%s: malloc failed", __func__);
return;
}
LSQ_DEBUG("creating delayed streams");
for (i = 0; i < avail; ++i)
{
/* Delay calling on_new in order not to let the user screw up
* the counts by making more streams.
*/
new_streams[i] = new_stream(conn, generate_stream_id(conn), 0);
if (!new_streams[i])
{
ABORT_ERROR("%s: cannot create new stream: %s", __func__,
strerror(errno));
goto cleanup;
}
}
LSQ_DEBUG("created %u delayed stream%.*s", avail, avail != 1, "s");
assert(count_streams(conn, 0) <= conn->fc_cfg.max_streams_out);
conn->fc_n_delayed_streams -= avail;
for (i = 0; i < avail; ++i)
lsquic_stream_call_on_new(new_streams[i]);
cleanup:
free(new_streams);
}
static void
service_streams (struct full_conn *conn)
{
struct lsquic_hash_elem *el;
lsquic_stream_t *stream, *next;
int closed_some = 0;
for (stream = TAILQ_FIRST(&conn->fc_pub.service_streams); stream; stream = next)
{
next = TAILQ_NEXT(stream, next_service_stream);
if (stream->sm_qflags & SMQF_ABORT_CONN)
/* No need to unset this flag or remove this stream: the connection
* is about to be aborted.
*/
ABORT_ERROR("aborted due to error in stream %"PRIu64, stream->id);
if (stream->sm_qflags & SMQF_CALL_ONCLOSE)
{
lsquic_stream_call_on_close(stream);
closed_some |= is_our_stream(conn, stream);
conn_mark_stream_closed(conn, stream->id);
}
if (stream->sm_qflags & SMQF_FREE_STREAM)
{
TAILQ_REMOVE(&conn->fc_pub.service_streams, stream, next_service_stream);
el = lsquic_hash_find(conn->fc_pub.all_streams, &stream->id, sizeof(stream->id));
if (el)
lsquic_hash_erase(conn->fc_pub.all_streams, el);
SAVE_STREAM_HISTORY(conn, stream);
lsquic_stream_destroy(stream);
}
}
if (either_side_going_away(conn))
{
while (conn->fc_n_delayed_streams)
{
--conn->fc_n_delayed_streams;
LSQ_DEBUG("goaway mode: delayed stream results in null ctor");
(void) conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_new_stream(
conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx, NULL);
}
maybe_close_conn(conn);
}
else
if (closed_some && conn->fc_n_delayed_streams)
create_delayed_streams(conn);
}
struct filter_stream_ctx
{
struct full_conn *conn;
uint32_t last_stream_id,
max_peer_stream_id;
};
static int
filter_out_old_streams (void *ctx, lsquic_stream_t *stream)
{
struct filter_stream_ctx *const fctx = ctx;
return ((!((stream->id ^ fctx->last_stream_id) & 1) &&
stream->id > fctx->last_stream_id)
||
(!((stream->id ^ fctx->max_peer_stream_id) & 1) &&
stream->id > fctx->max_peer_stream_id));
}
static void
process_streams_read_events (struct full_conn *conn)
{
lsquic_stream_t *stream;
struct filter_stream_ctx fctx;
enum stream_q_flags q_flags;
int needs_service;
struct stream_prio_iter spi;
if (TAILQ_EMPTY(&conn->fc_pub.read_streams))
return;
fctx.last_stream_id = conn->fc_last_stream_id;
fctx.max_peer_stream_id = conn->fc_max_peer_stream_id;
lsquic_spi_init(&spi, TAILQ_FIRST(&conn->fc_pub.read_streams),
TAILQ_LAST(&conn->fc_pub.read_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_read_stream),
&conn->fc_pub, "read", NULL, NULL);
needs_service = 0;
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
{
q_flags = stream->sm_qflags & SMQF_SERVICE_FLAGS;
lsquic_stream_dispatch_read_events(stream);
needs_service |= q_flags ^ (stream->sm_qflags & SMQF_SERVICE_FLAGS);
}
if (needs_service)
service_streams(conn);
/* If new streams were created as result of the read dispatching above,
* process these new streams. This logic is only applicable to in the
* server mode, as a client that creates a stream from an on_read() event
* is not likely to want to *read* from it immediately.
*/
if ((conn->fc_flags & FC_SERVER) &&
(fctx.last_stream_id < conn->fc_last_stream_id ||
fctx.max_peer_stream_id < conn->fc_max_peer_stream_id))
{
fctx.conn = conn;
lsquic_spi_init(&spi, TAILQ_FIRST(&conn->fc_pub.read_streams),
TAILQ_LAST(&conn->fc_pub.read_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_read_stream),
&conn->fc_pub, "read-new",
filter_out_old_streams, &fctx);
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
lsquic_stream_dispatch_read_events(stream);
}
}
static void
maybe_conn_flush_headers_stream (struct full_conn *conn)
{
lsquic_stream_t *stream;
if (conn->fc_flags & FC_HTTP)
{
stream = lsquic_headers_stream_get_stream(conn->fc_pub.u.gquic.hs);
if (lsquic_stream_has_data_to_flush(stream))
(void) lsquic_stream_flush(stream);
}
}
static void
process_streams_write_events (struct full_conn *conn, int high_prio)
{
lsquic_stream_t *stream;
struct stream_prio_iter spi;
lsquic_spi_init(&spi, TAILQ_FIRST(&conn->fc_pub.write_streams),
TAILQ_LAST(&conn->fc_pub.write_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_write_stream),
&conn->fc_pub,
high_prio ? "write-high" : "write-low", NULL, NULL);
if (high_prio)
lsquic_spi_drop_non_high(&spi);
else
lsquic_spi_drop_high(&spi);
for (stream = lsquic_spi_first(&spi); stream && write_is_possible(conn);
stream = lsquic_spi_next(&spi))
if (stream->sm_qflags & SMQF_WRITE_Q_FLAGS)
lsquic_stream_dispatch_write_events(stream);
maybe_conn_flush_headers_stream(conn);
}
static void
process_hsk_stream_read_events (struct full_conn *conn)
{
lsquic_stream_t *stream;
TAILQ_FOREACH(stream, &conn->fc_pub.read_streams, next_read_stream)
if (lsquic_stream_is_crypto(stream))
{
lsquic_stream_dispatch_read_events(stream);
break;
}
}
static void
process_hsk_stream_write_events (struct full_conn *conn)
{
lsquic_stream_t *stream;
TAILQ_FOREACH(stream, &conn->fc_pub.write_streams, next_write_stream)
if (lsquic_stream_is_crypto(stream))
{
lsquic_stream_dispatch_write_events(stream);
break;
}
}
static void
generate_ack_frame (struct full_conn *conn)
{
lsquic_packet_out_t *packet_out;
packet_out = lsquic_send_ctl_new_packet_out(&conn->fc_send_ctl, 0, PNS_APP,
&conn->fc_path);
if (packet_out)
{
lsquic_send_ctl_scheduled_one(&conn->fc_send_ctl, packet_out);
full_conn_ci_write_ack(&conn->fc_conn, packet_out);
}
else
ABORT_ERROR("cannot allocate packet: %s", strerror(errno));
}
static int
conn_ok_to_close (const struct full_conn *conn)
{
assert(conn->fc_flags & FC_CLOSING);
return !(conn->fc_flags & FC_SERVER)
|| (conn->fc_flags & FC_RECV_CLOSE)
|| (
!lsquic_send_ctl_have_outgoing_stream_frames(&conn->fc_send_ctl)
&& lsquic_hash_count(conn->fc_pub.all_streams) <= N_SPECIAL_STREAMS
&& lsquic_send_ctl_have_unacked_stream_frames(&conn->fc_send_ctl) == 0);
}
static enum tick_st
immediate_close (struct full_conn *conn)
{
lsquic_packet_out_t *packet_out;
const char *error_reason;
unsigned error_code;
int sz;
if (conn->fc_flags & (FC_TICK_CLOSE|FC_GOT_PRST))
return TICK_CLOSE;
conn->fc_flags |= FC_TICK_CLOSE;
/* No reason to send anything that's been scheduled if connection is
* being closed immedately. This also ensures that packet numbers
* sequence is always increasing.
*/
lsquic_send_ctl_drop_scheduled(&conn->fc_send_ctl);
if ((conn->fc_flags & FC_TIMED_OUT) && conn->fc_settings->es_silent_close)
return TICK_CLOSE;
packet_out = lsquic_send_ctl_new_packet_out(&conn->fc_send_ctl, 0, PNS_APP,
&conn->fc_path);
if (!packet_out)
{
LSQ_WARN("cannot allocate packet: %s", strerror(errno));
return TICK_CLOSE;
}
assert(conn->fc_flags & (FC_ERROR|FC_ABORTED|FC_TIMED_OUT|FC_HSK_FAILED));
if (conn->fc_flags & FC_ERROR)
{
error_code = 0x01; /* QUIC_INTERNAL_ERROR */
error_reason = "connection error";
}
else if (conn->fc_flags & FC_ABORTED)
{
error_code = 0x10; /* QUIC_PEER_GOING_AWAY */
error_reason = "user aborted connection";
}
else if (conn->fc_flags & FC_TIMED_OUT)
{
error_code = 0x19; /* QUIC_NETWORK_IDLE_TIMEOUT */
error_reason = "connection timed out";
}
else if (conn->fc_flags & FC_HSK_FAILED)
{
error_code = 0x2A; /* QUIC_PROOF_INVALID */
error_reason = "handshake failed";
}
else
{
error_code = 0x10; /* QUIC_PEER_GOING_AWAY */
error_reason = NULL;
}
lsquic_send_ctl_scheduled_one(&conn->fc_send_ctl, packet_out);
sz = conn->fc_conn.cn_pf->pf_gen_connect_close_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), 0, error_code,
error_reason, error_reason ? strlen(error_reason) : 0);
if (sz < 0) {
LSQ_WARN("%s failed", __func__);
return TICK_CLOSE;
}
lsquic_send_ctl_incr_pack_sz(&conn->fc_send_ctl, packet_out, sz);
packet_out->po_frame_types |= 1 << QUIC_FRAME_CONNECTION_CLOSE;
LSQ_DEBUG("generated CONNECTION_CLOSE frame in its own packet");
return TICK_SEND|TICK_CLOSE;
}
static int
write_is_possible (struct full_conn *conn)
{
const lsquic_packet_out_t *packet_out;
packet_out = lsquic_send_ctl_last_scheduled(&conn->fc_send_ctl, PNS_APP,
&conn->fc_path, 0);
return (packet_out && lsquic_packet_out_avail(packet_out) > 10)
|| lsquic_send_ctl_can_send(&conn->fc_send_ctl);
}
static int
should_generate_ack (const struct full_conn *conn)
{
return (conn->fc_flags & FC_ACK_QUEUED)
|| lsquic_send_ctl_lost_ack(&conn->fc_send_ctl);
}
static int
full_conn_ci_can_write_ack (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
return should_generate_ack(conn);
}
struct full_ack_state
{
enum full_conn_flags conn_flags;
enum alarm_id_bit armed_set;
unsigned n_slack_akbl;
unsigned n_stop_waiting;
};
typedef char ack_state_size[sizeof(struct full_ack_state)
<= sizeof(struct ack_state) ? 1 : - 1];
static void
full_conn_ci_ack_snapshot (struct lsquic_conn *lconn, struct ack_state *opaque)
{
struct full_conn *conn = (struct full_conn *) lconn;
struct full_ack_state *const ack_state = (struct full_ack_state *) opaque;
ack_state->conn_flags = conn->fc_flags;
ack_state->armed_set = conn->fc_alset.as_armed_set;
ack_state->n_slack_akbl = conn->fc_n_slack_akbl;
ack_state->n_stop_waiting
= lsquic_send_ctl_n_stop_waiting(&conn->fc_send_ctl);
LSQ_DEBUG("take ACK snapshot");
}
static void
full_conn_ci_ack_rollback (struct lsquic_conn *lconn, struct ack_state *opaque)
{
struct full_ack_state *const ack_state = (struct full_ack_state *) opaque;
struct full_conn *conn = (struct full_conn *) lconn;
conn->fc_flags &= ~(FC_ACK_HAD_MISS|FC_ACK_QUEUED);
conn->fc_flags |= (FC_ACK_HAD_MISS|FC_ACK_QUEUED)
& ack_state->conn_flags;
conn->fc_alset.as_armed_set &= ~ALBIT_ACK_APP;
conn->fc_alset.as_armed_set |= ALBIT_ACK_APP & ack_state->armed_set;
conn->fc_n_slack_akbl = ack_state->n_slack_akbl;
conn->fc_send_ctl.sc_n_stop_waiting = ack_state->n_stop_waiting;
LSQ_DEBUG("roll back ACK state");
}
/* This should be called before lsquic_alarmset_ring_expired() */
static void
maybe_set_noprogress_alarm (struct full_conn *conn, lsquic_time_t now)
{
lsquic_time_t exp;
if (conn->fc_flags & FC_NOPROG_TIMEOUT)
{
if (conn->fc_pub.last_tick)
{
exp = conn->fc_pub.last_prog + conn->fc_enpub->enp_noprog_timeout;
if (!lsquic_alarmset_is_set(&conn->fc_alset, AL_IDLE)
|| exp < conn->fc_alset.as_expiry[AL_IDLE])
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE, exp);
conn->fc_pub.last_tick = now;
}
else
{
conn->fc_pub.last_tick = now;
conn->fc_pub.last_prog = now;
}
}
}
static enum tick_st
full_conn_ci_tick (lsquic_conn_t *lconn, lsquic_time_t now)
{
struct full_conn *conn = (struct full_conn *) lconn;
int have_delayed_packets;
unsigned n;
int s;
enum tick_st tick = 0;
#define CLOSE_IF_NECESSARY() do { \
if (conn->fc_flags & FC_IMMEDIATE_CLOSE_FLAGS) \
{ \
tick |= immediate_close(conn); \
goto close_end; \
} \
} while (0)
#define RETURN_IF_OUT_OF_PACKETS() do { \
if (!lsquic_send_ctl_can_send(&conn->fc_send_ctl)) \
{ \
if (0 == lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl)) \
{ \
LSQ_DEBUG("used up packet allowance, quiet now (line %d)", \
__LINE__); \
tick |= TICK_QUIET; \
} \
else \
{ \
LSQ_DEBUG("used up packet allowance, sending now (line %d)",\
__LINE__); \
tick |= TICK_SEND; \
} \
goto end; \
} \
} while (0)
#if LSQUIC_CONN_STATS
++conn->fc_stats.n_ticks;
#endif
if (LSQ_LOG_ENABLED(LSQ_LOG_DEBUG)
&& conn->fc_mem_logged_last + 1000000 <= now)
{
conn->fc_mem_logged_last = now;
LSQ_DEBUG("memory used: %zd bytes", calc_mem_used(conn));
}
if (conn->fc_flags & FC_HAVE_SAVED_ACK)
{
(void) /* If there is an error, we'll fail shortly */
process_ack(conn, &conn->fc_ack, conn->fc_saved_ack_received, now);
conn->fc_flags &= ~FC_HAVE_SAVED_ACK;
}
maybe_set_noprogress_alarm(conn, now);
lsquic_send_ctl_tick_in(&conn->fc_send_ctl, now);
lsquic_send_ctl_set_buffer_stream_packets(&conn->fc_send_ctl, 1);
CLOSE_IF_NECESSARY();
lsquic_alarmset_ring_expired(&conn->fc_alset, now);
CLOSE_IF_NECESSARY();
/* To make things simple, only stream 1 is active until the handshake
* has been completed. This will be adjusted in the future: the client
* does not want to wait if it has the server information.
*/
if (conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE)
process_streams_read_events(conn);
else
process_hsk_stream_read_events(conn);
CLOSE_IF_NECESSARY();
if (lsquic_send_ctl_pacer_blocked(&conn->fc_send_ctl))
goto skip_write;
if (conn->fc_flags & FC_FIRST_TICK)
{
conn->fc_flags &= ~FC_FIRST_TICK;
have_delayed_packets = 0;
}
else
/* If there are any scheduled packets at this point, it means that
* they were not sent during previous tick; in other words, they
* are delayed. When there are delayed packets, the only packet
* we sometimes add is a packet with an ACK frame, and we add it
* to the *front* of the queue.
*/
have_delayed_packets = lsquic_send_ctl_maybe_squeeze_sched(
&conn->fc_send_ctl);
if (should_generate_ack(conn))
{
if (have_delayed_packets)
lsquic_send_ctl_reset_packnos(&conn->fc_send_ctl);
generate_ack_frame(conn);
CLOSE_IF_NECESSARY();
/* Try to send STOP_WAITING frame at the same time we send an ACK
* This follows reference implementation.
*/
if (!(conn->fc_flags & FC_NSTP))
conn->fc_flags |= FC_SEND_STOP_WAITING;
if (have_delayed_packets)
{
if (conn->fc_flags & FC_SEND_STOP_WAITING)
{
/* TODO: ensure that STOP_WAITING frame is in the same packet
* as the ACK frame in delayed packet mode.
*/
generate_stop_waiting_frame(conn);
CLOSE_IF_NECESSARY();
}
lsquic_send_ctl_ack_to_front(&conn->fc_send_ctl, 1);
}
}
if (have_delayed_packets)
{
/* The reason for not adding STOP_WAITING and other frames below
* to the packet carrying ACK frame generated when there are delayed
* packets is so that if the ACK packet itself is delayed, it can be
* dropped and replaced by new ACK packet. This way, we are never
* more than 1 packet over CWND.
*/
tick |= TICK_SEND;
if (conn->fc_flags & FC_CLOSING)
goto end_write;
else
goto end;
}
/* Try to fit any of the following three frames -- STOP_WAITING,
* WINDOW_UPDATE, and GOAWAY -- before checking if we have run
* out of packets. If either of them does not fit, it will be
* tried next time around.
*/
if (conn->fc_flags & FC_SEND_STOP_WAITING)
{
generate_stop_waiting_frame(conn);
CLOSE_IF_NECESSARY();
}
if (lsquic_cfcw_fc_offsets_changed(&conn->fc_pub.cfcw) ||
(conn->fc_flags & FC_SEND_WUF))
{
conn->fc_flags |= FC_SEND_WUF;
generate_wuf_conn(conn);
CLOSE_IF_NECESSARY();
}
if (conn->fc_flags & FC_SEND_GOAWAY)
{
generate_goaway_frame(conn);
CLOSE_IF_NECESSARY();
}
n = lsquic_send_ctl_reschedule_packets(&conn->fc_send_ctl);
if (n > 0)
CLOSE_IF_NECESSARY();
if (conn->fc_conn.cn_flags & LSCONN_SEND_BLOCKED)
{
RETURN_IF_OUT_OF_PACKETS();
if (generate_blocked_frame(conn, 0))
conn->fc_conn.cn_flags &= ~LSCONN_SEND_BLOCKED;
}
if (!STAILQ_EMPTY(&conn->fc_stream_ids_to_reset))
{
packetize_standalone_stream_resets(conn);
CLOSE_IF_NECESSARY();
}
if (!TAILQ_EMPTY(&conn->fc_pub.sending_streams))
{
process_streams_ready_to_send(conn);
CLOSE_IF_NECESSARY();
}
lsquic_send_ctl_set_buffer_stream_packets(&conn->fc_send_ctl, 0);
if (!handshake_done_or_doing_sess_resume(conn))
{
process_hsk_stream_write_events(conn);
lsquic_send_ctl_maybe_app_limited(&conn->fc_send_ctl, &conn->fc_path);
goto end_write;
}
maybe_conn_flush_headers_stream(conn);
s = lsquic_send_ctl_schedule_buffered(&conn->fc_send_ctl, BPT_HIGHEST_PRIO);
conn->fc_flags |= (s < 0) << FC_BIT_ERROR;
if (!write_is_possible(conn))
goto end_write;
if (!TAILQ_EMPTY(&conn->fc_pub.write_streams))
{
process_streams_write_events(conn, 1);
if (!write_is_possible(conn))
goto end_write;
}
s = lsquic_send_ctl_schedule_buffered(&conn->fc_send_ctl, BPT_OTHER_PRIO);
conn->fc_flags |= (s < 0) << FC_BIT_ERROR;
if (!write_is_possible(conn))
goto end_write;
if (!TAILQ_EMPTY(&conn->fc_pub.write_streams))
process_streams_write_events(conn, 0);
lsquic_send_ctl_maybe_app_limited(&conn->fc_send_ctl, &conn->fc_path);
end_write:
skip_write:
if ((conn->fc_flags & FC_CLOSING) && conn_ok_to_close(conn))
{
LSQ_DEBUG("connection is OK to close");
/* This is normal termination sequence.
*
* Generate CONNECTION_CLOSE frame if we are responding to one, have
* packets scheduled to send, or silent close flag is not set.
*/
conn->fc_flags |= FC_TICK_CLOSE;
if (conn->fc_flags & FC_RECV_CLOSE)
tick |= TICK_CLOSE;
if ((conn->fc_flags & FC_RECV_CLOSE) ||
0 != lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl) ||
!conn->fc_settings->es_silent_close)
{
RETURN_IF_OUT_OF_PACKETS();
generate_connection_close_packet(conn);
tick |= TICK_SEND|TICK_CLOSE;
}
else
tick |= TICK_CLOSE;
goto end;
}
if (0 == lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl))
{
if (conn->fc_flags & FC_SEND_PING)
{
RETURN_IF_OUT_OF_PACKETS();
conn->fc_flags &= ~FC_SEND_PING;
generate_ping_frame(conn);
CLOSE_IF_NECESSARY();
assert(lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl) != 0);
}
else
{
tick |= TICK_QUIET;
goto end;
}
}
else if (conn->fc_settings->es_ping_period)
{
lsquic_alarmset_unset(&conn->fc_alset, AL_PING);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
conn->fc_flags &= ~FC_SEND_PING; /* It may have rung */
}
/* From the spec:
* " The PING frame should be used to keep a connection alive when
* " a stream is open.
*/
if (conn->fc_settings->es_ping_period
&& lsquic_hash_count(conn->fc_pub.all_streams) > 0)
lsquic_alarmset_set(&conn->fc_alset, AL_PING,
now + conn->fc_settings->es_ping_period * 1000 * 1000);
tick |= TICK_SEND;
end:
service_streams(conn);
CLOSE_IF_NECESSARY();
close_end:
lsquic_send_ctl_set_buffer_stream_packets(&conn->fc_send_ctl, 1);
lsquic_send_ctl_tick_out(&conn->fc_send_ctl);
return tick;
}
static void
set_earliest_idle_alarm (struct full_conn *conn, lsquic_time_t idle_conn_to)
{
lsquic_time_t exp;
if (conn->fc_pub.last_prog
&& (assert(conn->fc_flags & FC_NOPROG_TIMEOUT),
exp = conn->fc_pub.last_prog + conn->fc_enpub->enp_noprog_timeout,
exp < idle_conn_to))
idle_conn_to = exp;
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE, idle_conn_to);
}
static void
full_conn_ci_packet_in (lsquic_conn_t *lconn, lsquic_packet_in_t *packet_in)
{
struct full_conn *conn = (struct full_conn *) lconn;
#if LSQUIC_CONN_STATS
conn->fc_stats.in.bytes += packet_in->pi_data_sz;
#endif
set_earliest_idle_alarm(conn,
packet_in->pi_received + conn->fc_settings->es_idle_conn_to);
if (0 == (conn->fc_flags & FC_ERROR))
if (0 != process_incoming_packet(conn, packet_in))
conn->fc_flags |= FC_ERROR;
}
static lsquic_packet_out_t *
full_conn_ci_next_packet_to_send (struct lsquic_conn *lconn,
const struct to_coal *unused)
{
struct full_conn *conn = (struct full_conn *) lconn;
return lsquic_send_ctl_next_packet_to_send(&conn->fc_send_ctl, NULL);
}
static void
full_conn_ci_packet_sent (lsquic_conn_t *lconn, lsquic_packet_out_t *packet_out)
{
struct full_conn *conn = (struct full_conn *) lconn;
int s;
recent_packet_hist_new(conn, 1, packet_out->po_sent);
recent_packet_hist_frames(conn, 1, packet_out->po_frame_types);
if (packet_out->po_frame_types & GQUIC_FRAME_RETRANSMITTABLE_MASK)
conn->fc_n_cons_unretx = 0;
else
++conn->fc_n_cons_unretx;
s = lsquic_send_ctl_sent_packet(&conn->fc_send_ctl, packet_out);
if (s != 0)
ABORT_ERROR("sent packet failed: %s", strerror(errno));
#if LSQUIC_CONN_STATS
++conn->fc_stats.out.packets;
conn->fc_stats.out.bytes += lsquic_packet_out_sent_sz(lconn, packet_out);
#endif
}
static void
full_conn_ci_packet_not_sent (lsquic_conn_t *lconn, lsquic_packet_out_t *packet_out)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_send_ctl_delayed_one(&conn->fc_send_ctl, packet_out);
}
static void
full_conn_ci_hsk_done (lsquic_conn_t *lconn, enum lsquic_hsk_status status)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_alarmset_unset(&conn->fc_alset, AL_HANDSHAKE);
switch (status)
{
case LSQ_HSK_RESUMED_FAIL:
case LSQ_HSK_FAIL:
conn->fc_flags |= FC_HSK_FAILED;
break;
case LSQ_HSK_OK:
case LSQ_HSK_RESUMED_OK:
if (0 == apply_peer_settings(conn))
{
if (conn->fc_flags & FC_HTTP)
maybe_send_settings(conn);
lconn->cn_flags |= LSCONN_HANDSHAKE_DONE;
}
else
conn->fc_flags |= FC_ERROR;
break;
}
if (conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_hsk_done)
conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_hsk_done(lconn,
status);
if (status == LSQ_HSK_OK || status == LSQ_HSK_RESUMED_OK)
{
if (conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_sess_resume_info)
conn->fc_conn.cn_esf.g->esf_maybe_dispatch_sess_resume(
conn->fc_conn.cn_enc_session,
conn->fc_stream_ifs[STREAM_IF_STD].stream_if->on_sess_resume_info);
if (conn->fc_n_delayed_streams)
create_delayed_streams(conn);
if (!(conn->fc_flags & FC_SERVER))
lsquic_send_ctl_begin_optack_detection(&conn->fc_send_ctl);
}
}
static void
full_conn_ci_abort (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
LSQ_INFO("User aborted connection");
conn->fc_flags |= FC_ABORTED;
lsquic_engine_add_conn_to_tickable(conn->fc_enpub, lconn);
}
static void
full_conn_ci_internal_error (struct lsquic_conn *lconn,
const char *format, ...)
{
struct full_conn *const conn = (struct full_conn *) lconn;
LSQ_INFO("Internal error reported");
conn->fc_flags |= FC_ERROR;
}
/* This function should not be called, as this is specific to IETF QUIC */
static void
full_conn_ci_abort_error (struct lsquic_conn *lconn, int is_app,
unsigned error_code, const char *fmt, ...)
{
struct full_conn *const conn = (struct full_conn *) lconn;
assert(0);
LSQ_WARN("(GQUIC) abort error is called unexpectedly");
conn->fc_flags |= FC_ERROR;
}
static void
full_conn_ci_close (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_stream_t *stream;
struct lsquic_hash_elem *el;
if (!(conn->fc_flags & FC_CLOSING))
{
for (el = lsquic_hash_first(conn->fc_pub.all_streams); el;
el = lsquic_hash_next(conn->fc_pub.all_streams))
{
stream = lsquic_hashelem_getdata(el);
if (!lsquic_stream_is_critical(stream))
lsquic_stream_maybe_reset(stream, 0, 1);
}
conn->fc_flags |= FC_CLOSING;
if (!(conn->fc_flags & FC_GOAWAY_SENT))
conn->fc_flags |= FC_SEND_GOAWAY;
lsquic_engine_add_conn_to_tickable(conn->fc_enpub, lconn);
}
}
static void
full_conn_ci_going_away (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
if (!(conn->fc_flags & (FC_CLOSING|FC_GOING_AWAY)))
{
LSQ_INFO("connection marked as going away");
assert(!(conn->fc_flags & FC_SEND_GOAWAY));
conn->fc_flags |= FC_GOING_AWAY;
if (!(conn->fc_flags & FC_GOAWAY_SENT))
{
conn->fc_flags |= FC_SEND_GOAWAY;
lsquic_engine_add_conn_to_tickable(conn->fc_enpub, lconn);
}
}
}
/* Find stream when stream ID is read from something other than a STREAM
* frame. If the stream cannot be found or created, the connection is
* aborted.
*/
#if __GNUC__
__attribute__((nonnull(4)))
#endif
static lsquic_stream_t *
find_stream_on_non_stream_frame (struct full_conn *conn,
lsquic_stream_id_t stream_id, enum stream_ctor_flags stream_ctor_flags,
const char *what)
{
lsquic_stream_t *stream;
unsigned in_count;
stream = find_stream_by_id(conn, stream_id);
if (stream)
return stream;
if (conn_is_stream_closed(conn, stream_id))
{
LSQ_DEBUG("drop incoming %s for closed stream %"PRIu64, what, stream_id);
return NULL;
}
/* XXX It seems that if we receive a priority frame for a stream, the
* stream should exist or have existed at some point. Thus, if
* it does not exist, we should return an error here.
*/
if (!is_peer_initiated(conn, stream_id))
{
ABORT_ERROR("frame for never-initiated stream (push promise?)");
return NULL;
}
in_count = count_streams(conn, 1);
LSQ_DEBUG("number of peer-initiated streams: %u", in_count);
if (in_count >= conn->fc_cfg.max_streams_in)
{
if (!(conn->fc_flags & FC_ABORT_COMPLAINED))
{
unsigned counts[N_SCNTS];
collect_stream_counts(conn, 1, counts);
ABORT_WARN("incoming %s for stream %"PRIu64" would exceed "
"limit: %u. all: %u; peer: %u; closed: %u; reset: %u; reset "
"and not closed: %u",
what, stream_id, conn->fc_cfg.max_streams_in, counts[SCNT_ALL],
counts[SCNT_PEER], counts[SCNT_CLOSED], counts[SCNT_RESET],
counts[SCNT_RES_UNCLO]);
}
return NULL;
}
if ((conn->fc_flags & FC_GOING_AWAY) &&
stream_id > conn->fc_max_peer_stream_id)
{
maybe_schedule_reset_for_stream(conn, stream_id);
LSQ_DEBUG("going away: reset new incoming stream %"PRIu64, stream_id);
return NULL;
}
stream = new_stream(conn, stream_id, stream_ctor_flags);
if (!stream)
{
ABORT_ERROR("cannot create new stream: %s", strerror(errno));
return NULL;
}
if (stream_id > conn->fc_max_peer_stream_id)
conn->fc_max_peer_stream_id = stream_id;
return stream;
}
static void
headers_stream_on_conn_error (void *ctx)
{
struct full_conn *conn = ctx;
ABORT_ERROR("connection error reported by HEADERS stream");
}
static void
headers_stream_on_stream_error (void *ctx, lsquic_stream_id_t stream_id)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream;
stream = find_stream_on_non_stream_frame(conn, stream_id, SCF_CALL_ON_NEW,
"error");
if (stream)
{
LSQ_DEBUG("resetting stream %"PRIu64" due to error", stream_id);
/* We use code 1, which is QUIC_INTERNAL_ERROR (see
* [draft-hamilton-quic-transport-protocol-01], Section 10), for all
* errors. There does not seem to be a good reason to figure out
* and send more specific error codes.
*/
lsquic_stream_maybe_reset(stream, 1, 0);
}
}
static void
headers_stream_on_enable_push (void *ctx, int enable_push)
{
struct full_conn *conn = ctx;
if (0 == enable_push)
{
LSQ_DEBUG("server push %d -> 0", !!(conn->fc_flags & FC_SUPPORT_PUSH));
conn->fc_flags &= ~FC_SUPPORT_PUSH;
}
else if (conn->fc_settings->es_support_push)
{
LSQ_DEBUG("server push %d -> 1", !!(conn->fc_flags & FC_SUPPORT_PUSH));
conn->fc_flags |= FC_SUPPORT_PUSH;
}
else
LSQ_INFO("not enabling server push that's disabled in engine settings");
}
static void
headers_stream_on_incoming_headers (void *ctx, struct uncompressed_headers *uh)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream;
LSQ_DEBUG("incoming headers for stream %"PRIu64, uh->uh_stream_id);
stream = find_stream_on_non_stream_frame(conn, uh->uh_stream_id, 0,
"headers");
if (!stream)
goto free_uh;
if (lsquic_stream_is_reset(stream))
{
LSQ_DEBUG("stream is reset: ignore headers");
goto free_uh;
}
if (0 != lsquic_stream_uh_in(stream, uh))
{
ABORT_ERROR("stream %"PRIu64" refused incoming headers",
uh->uh_stream_id);
goto free_uh;
}
if (!(stream->stream_flags & STREAM_ONNEW_DONE))
lsquic_stream_call_on_new(stream);
return;
free_uh:
if (uh->uh_hset)
conn->fc_enpub->enp_hsi_if->hsi_discard_header_set(uh->uh_hset);
free(uh);
}
static void
headers_stream_on_push_promise (void *ctx, struct uncompressed_headers *uh)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream;
assert(!(conn->fc_flags & FC_SERVER));
LSQ_DEBUG("push promise for stream %"PRIu64" in response to %"PRIu64,
uh->uh_oth_stream_id, uh->uh_stream_id);
if (0 == (uh->uh_stream_id & 1) ||
0 != (uh->uh_oth_stream_id & 1))
{
ABORT_ERROR("invalid push promise stream IDs: %"PRIu64", %"PRIu64,
uh->uh_oth_stream_id, uh->uh_stream_id);
goto free_uh;
}
if (!(conn_is_stream_closed(conn, uh->uh_stream_id) ||
find_stream_by_id(conn, uh->uh_stream_id)))
{
ABORT_ERROR("invalid push promise original stream ID %"PRIu64" never "
"initiated", uh->uh_stream_id);
goto free_uh;
}
if (conn_is_stream_closed(conn, uh->uh_oth_stream_id) ||
find_stream_by_id(conn, uh->uh_oth_stream_id))
{
ABORT_ERROR("invalid promised stream ID %"PRIu64" already used",
uh->uh_oth_stream_id);
goto free_uh;
}
stream = new_stream_ext(conn, uh->uh_oth_stream_id, STREAM_IF_STD,
(conn->fc_enpub->enp_settings.es_delay_onclose?SCF_DELAY_ONCLOSE:0)|
SCF_DI_AUTOSWITCH|(conn->fc_enpub->enp_settings.es_rw_once ?
SCF_DISP_RW_ONCE : 0));
if (!stream)
{
ABORT_ERROR("cannot create stream: %s", strerror(errno));
goto free_uh;
}
lsquic_stream_push_req(stream, uh);
lsquic_stream_call_on_new(stream);
return;
free_uh:
if (uh->uh_hset)
conn->fc_enpub->enp_hsi_if->hsi_discard_header_set(uh->uh_hset);
free(uh);
}
static void
headers_stream_on_priority (void *ctx, lsquic_stream_id_t stream_id,
int exclusive, lsquic_stream_id_t dep_stream_id, unsigned weight)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream;
LSQ_DEBUG("got priority frame for stream %"PRIu64": (ex: %d; dep stream: "
"%"PRIu64"; weight: %u)", stream_id, exclusive, dep_stream_id, weight);
stream = find_stream_on_non_stream_frame(conn, stream_id, SCF_CALL_ON_NEW,
"priority");
if (stream)
lsquic_stream_set_priority_internal(stream, weight);
}
#define STRLEN(s) (sizeof(s) - 1)
static struct uncompressed_headers *
synthesize_push_request (struct full_conn *conn, void *hset,
lsquic_stream_id_t pushed_stream_id, const lsquic_stream_t *dep_stream)
{
struct uncompressed_headers *uh;
assert(hset);
uh = malloc(sizeof(*uh));
if (!uh)
return NULL;
uh->uh_stream_id = pushed_stream_id;
uh->uh_oth_stream_id = 0; /* We don't do dependencies */
uh->uh_weight = lsquic_stream_priority(dep_stream) / 2 + 1;
uh->uh_exclusive = 0;
uh->uh_flags = UH_FIN;
if (lsquic_http1x_if == conn->fc_enpub->enp_hsi_if)
uh->uh_flags |= UH_H1H;
uh->uh_hset = hset;
uh->uh_next = NULL;
return uh;
}
static int
full_conn_ci_is_push_enabled (struct lsquic_conn *lconn)
{
struct full_conn *const conn = (struct full_conn *) lconn;
return conn->fc_flags & FC_SUPPORT_PUSH;
}
static int
full_conn_ci_push_stream (struct lsquic_conn *lconn, void *hset,
struct lsquic_stream *dep_stream, const struct lsquic_http_headers *headers)
{
struct full_conn *const conn = (struct full_conn *) lconn;
lsquic_stream_t *pushed_stream;
struct uncompressed_headers *uh; /* We synthesize the request */
lsquic_stream_id_t stream_id;
int hit_limit;
if ((conn->fc_flags & (FC_SERVER|FC_HTTP)) != (FC_SERVER|FC_HTTP))
{
LSQ_ERROR("must be server in HTTP mode to push streams");
return -1;
}
if (lsquic_stream_is_pushed(dep_stream))
{
LSQ_WARN("cannot push stream dependent on another pushed stream "
"(%"PRIu64")", dep_stream->id);
return -1;
}
if (!(conn->fc_flags & FC_SUPPORT_PUSH))
{
LSQ_INFO("server push support is disabled");
return 1;
}
if (!hset)
{
LSQ_ERROR("header set must be specified when pushing");
return -1;
}
hit_limit = 0;
if (either_side_going_away(conn) ||
(hit_limit = 1, count_streams(conn, 0) >= conn->fc_cfg.max_streams_out))
{
LSQ_DEBUG("cannot create pushed stream: %s", hit_limit ?
"hit connection limit" : "connection is going away");
return 1;
}
stream_id = generate_stream_id(conn);
uh = synthesize_push_request(conn, hset, stream_id, dep_stream);
if (!uh)
{
ABORT_ERROR("memory allocation failure");
return -1;
}
pushed_stream = new_stream(conn, stream_id, 0);
if (!pushed_stream)
{
LSQ_WARN("cannot create stream: %s", strerror(errno));
free(uh);
return -1;
}
if (0 != lsquic_stream_uh_in(pushed_stream, uh))
{
LSQ_WARN("stream barfed when fed synthetic request");
free(uh);
return -1;
}
if (0 != lsquic_headers_stream_push_promise(conn->fc_pub.u.gquic.hs, dep_stream->id,
pushed_stream->id, headers))
{
/* If forget we ever had the hset pointer: */
lsquic_stream_drop_hset_ref(pushed_stream);
/* Now roll back stream creation and return stream ID: */
if (pushed_stream->sm_hash_el.qhe_flags & QHE_HASHED)
lsquic_hash_erase(conn->fc_pub.all_streams,
&pushed_stream->sm_hash_el);
lsquic_stream_destroy(pushed_stream);
conn->fc_last_stream_id -= 2;
LSQ_INFO("could not send push promise");
return -1;
}
lsquic_stream_call_on_new(pushed_stream);
return 0;
}
static void
full_conn_ci_tls_alert (struct lsquic_conn *lconn, uint8_t alert)
{
assert(0);
}
static enum LSQUIC_CONN_STATUS
full_conn_ci_status (struct lsquic_conn *lconn, char *errbuf, size_t bufsz)
{
struct full_conn *const conn = (struct full_conn *) lconn;
size_t n;
/* Test the common case first: */
if (!(conn->fc_flags & (FC_ERROR
|FC_TIMED_OUT
|FC_ABORTED
|FC_GOT_PRST
|FC_HSK_FAILED
|FC_CLOSING
|FC_GOING_AWAY)))
{
if (lconn->cn_flags & LSCONN_PEER_GOING_AWAY)
return LSCONN_ST_PEER_GOING_AWAY;
else if (lconn->cn_flags & LSCONN_HANDSHAKE_DONE)
return LSCONN_ST_CONNECTED;
else
return LSCONN_ST_HSK_IN_PROGRESS;
}
if (errbuf && bufsz)
{
if (conn->fc_errmsg)
{
n = bufsz < MAX_ERRMSG ? bufsz : MAX_ERRMSG;
strncpy(errbuf, conn->fc_errmsg, n);
errbuf[n - 1] = '\0';
}
else
errbuf[0] = '\0';
}
if (conn->fc_flags & FC_ERROR)
{
if (conn->fc_flags & FC_HSK_FAILED)
return LSCONN_ST_VERNEG_FAILURE;
else
return LSCONN_ST_ERROR;
}
if (conn->fc_flags & FC_TIMED_OUT)
return LSCONN_ST_TIMED_OUT;
if (conn->fc_flags & FC_ABORTED)
return LSCONN_ST_USER_ABORTED;
if (conn->fc_flags & FC_GOT_PRST)
return LSCONN_ST_RESET;
if (conn->fc_flags & FC_HSK_FAILED)
return LSCONN_ST_HSK_FAILURE;
if (conn->fc_flags & FC_CLOSING)
return LSCONN_ST_CLOSED;
assert(conn->fc_flags & FC_GOING_AWAY);
return LSCONN_ST_GOING_AWAY;
}
static int
full_conn_ci_is_tickable (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
struct lsquic_stream *stream;
if (!TAILQ_EMPTY(&conn->fc_pub.service_streams))
{
LSQ_DEBUG("tickable: there are streams to be serviced");
return 1;
}
if ((conn->fc_enpub->enp_flags & ENPUB_CAN_SEND)
&& (should_generate_ack(conn) ||
!lsquic_send_ctl_sched_is_blocked(&conn->fc_send_ctl)))
{
const enum full_conn_flags send_flags = FC_SEND_GOAWAY
|FC_SEND_STOP_WAITING|FC_SEND_PING|FC_SEND_WUF;
if (conn->fc_flags & send_flags)
{
LSQ_DEBUG("tickable: flags: 0x%X", conn->fc_flags & send_flags);
goto check_can_send;
}
if (lsquic_send_ctl_has_sendable(&conn->fc_send_ctl))
{
LSQ_DEBUG("tickable: has sendable packets");
return 1; /* Don't check can_send: already on scheduled queue */
}
if ((conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE)
&& lsquic_send_ctl_has_buffered(&conn->fc_send_ctl))
{
LSQ_DEBUG("tickable: has buffered packets");
goto check_can_send;
}
if (!TAILQ_EMPTY(&conn->fc_pub.sending_streams))
{
LSQ_DEBUG("tickable: there are sending streams");
goto check_can_send;
}
if (handshake_done_or_doing_sess_resume(conn))
{
TAILQ_FOREACH(stream, &conn->fc_pub.write_streams,
next_write_stream)
if (lsquic_stream_write_avail(stream))
{
LSQ_DEBUG("tickable: stream %"PRIu64" can be written to",
stream->id);
goto check_can_send;
}
}
else
{
TAILQ_FOREACH(stream, &conn->fc_pub.write_streams,
next_write_stream)
if (lsquic_stream_is_crypto(stream)
&& lsquic_stream_write_avail(stream))
{
LSQ_DEBUG("tickable: stream %"PRIu64" can be written to",
stream->id);
goto check_can_send;
}
}
goto check_readable_streams;
check_can_send:
if (lsquic_send_ctl_can_send(&conn->fc_send_ctl))
return 1;
}
check_readable_streams:
TAILQ_FOREACH(stream, &conn->fc_pub.read_streams, next_read_stream)
if (lsquic_stream_readable(stream))
{
LSQ_DEBUG("tickable: stream %"PRIu64" can be read from",
stream->id);
return 1;
}
if (conn->fc_flags & FC_IMMEDIATE_CLOSE_FLAGS)
{
LSQ_DEBUG("tickable: immediate close flags: 0x%X",
(unsigned) (conn->fc_flags & FC_IMMEDIATE_CLOSE_FLAGS));
return 1;
}
LSQ_DEBUG("not tickable");
return 0;
}
static lsquic_time_t
full_conn_ci_next_tick_time (lsquic_conn_t *lconn, unsigned *why)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_time_t alarm_time, pacer_time, now;
enum alarm_id al_id;
alarm_time = lsquic_alarmset_mintime(&conn->fc_alset, &al_id);
pacer_time = lsquic_send_ctl_next_pacer_time(&conn->fc_send_ctl);
if (pacer_time && LSQ_LOG_ENABLED(LSQ_LOG_DEBUG))
{
now = lsquic_time_now();
if (pacer_time < now)
LSQ_DEBUG("%s: pacer is %"PRIu64" usec in the past", __func__,
now - pacer_time);
}
if (alarm_time && pacer_time)
{
if (alarm_time < pacer_time)
{
*why = N_AEWS + al_id;
return alarm_time;
}
else
{
*why = AEW_PACER;
return pacer_time;
}
}
else if (alarm_time)
{
*why = N_AEWS + al_id;
return alarm_time;
}
else if (pacer_time)
{
*why = AEW_PACER;
return pacer_time;
}
else
return 0;
}
int
lsquic_gquic_full_conn_srej (struct lsquic_conn *lconn)
{
struct full_conn *const conn = (struct full_conn *) lconn;
const unsigned cce_idx = lconn->cn_cur_cce_idx;
struct conn_cid_elem *const cce = &lconn->cn_cces[ cce_idx ];
struct lsquic_stream *stream;
enum lsquic_version version;
if (lconn->cn_esf_c->esf_is_sess_resume_enabled(conn->fc_conn.cn_enc_session))
{
/* We need to do this because we do not clean up any data that may
* have been already sent. This is left an optimization for the
* future.
*/
LSQ_DEBUG("received SREJ when 0RTT was on: fail handshake and let "
"caller retry");
full_conn_ci_hsk_done(lconn, LSQ_HSK_RESUMED_FAIL);
return -1;
}
LSQ_DEBUG("reinitialize CID and other state due to SREJ");
/* Generate new CID and update connections hash */
if (cce->cce_hash_el.qhe_flags & QHE_HASHED)
{
lsquic_engine_retire_cid(conn->fc_enpub, lconn, cce_idx,
0 /* OK to omit the `now' value */, 0);
lconn->cn_cces_mask |= 1 << cce_idx;
lsquic_generate_cid_gquic(&cce->cce_cid);
if (0 != lsquic_engine_add_cid(conn->fc_enpub, lconn, cce_idx))
return -1;
}
else
{
LSQ_DEBUG("not hashed by CID, no need to reinsert");
lsquic_generate_cid_gquic(&cce->cce_cid);
}
lconn->cn_esf.g->esf_reset_cid(lconn->cn_enc_session, &cce->cce_cid);
/* Reset version negotiation */
version = highest_bit_set(conn->fc_orig_versions);
init_ver_neg(conn, conn->fc_orig_versions, &version);
/* Reset receive history */
lsquic_rechist_cleanup(&conn->fc_rechist);
lsquic_rechist_init(&conn->fc_rechist, 0, MAX_ACK_RANGES);
/* Reset send controller state */
lsquic_send_ctl_cleanup(&conn->fc_send_ctl);
lsquic_send_ctl_init(&conn->fc_send_ctl, &conn->fc_alset, conn->fc_enpub,
&conn->fc_ver_neg, &conn->fc_pub, 0);
/* Reset handshake stream state */
stream = find_stream_by_id(conn, hsk_stream_id(conn));
if (!stream)
return -1;
stream->n_unacked = 0;
stream->tosend_off = 0;
stream->read_offset = 0;
stream->fc.sf_read_off = 0;
stream->fc.sf_max_recv_off = 0;
lsquic_alarmset_unset(&conn->fc_alset, AL_RETX_APP);
lsquic_alarmset_unset(&conn->fc_alset, AL_ACK_APP);
conn->fc_flags &= ~(FC_ACK_QUEUED|FC_ACK_HAD_MISS|FC_NSTP);
conn->fc_flags |= FC_GOT_SREJ;
return 0;
}
#if LSQUIC_CONN_STATS
static const struct conn_stats *
full_conn_ci_get_stats (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
return &conn->fc_stats;
}
#include "lsquic_cong_ctl.h"
static void
full_conn_ci_log_stats (struct lsquic_conn *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
struct batch_size_stats *const bs = &conn->fc_enpub->enp_batch_size_stats;
struct conn_stats diff_stats;
uint64_t cwnd;
char cidstr[MAX_CID_LEN * 2 + 1];
if (!conn->fc_last_stats)
{
conn->fc_last_stats = calloc(1, sizeof(*conn->fc_last_stats));
if (!conn->fc_last_stats)
return;
LSQ_DEBUG("allocated last stats");
}
cwnd = conn->fc_send_ctl.sc_ci->cci_get_cwnd(
conn->fc_send_ctl.sc_cong_ctl);
lsquic_conn_stats_diff(&conn->fc_stats, conn->fc_last_stats, &diff_stats);
lsquic_logger_log1(LSQ_LOG_NOTICE, LSQLM_CONN_STATS,
"%s: ticks: %lu; cwnd: %"PRIu64"; conn flow: max: %"PRIu64
", avail: %"PRIu64"; packets: sent: %lu, lost: %lu, retx: %lu, rcvd: %lu"
"; batch: count: %u; min: %u; max: %u; avg: %.2f",
(lsquic_cid2str(LSQUIC_LOG_CONN_ID, cidstr), cidstr),
diff_stats.n_ticks, cwnd,
conn->fc_pub.conn_cap.cc_max,
lsquic_conn_cap_avail(&conn->fc_pub.conn_cap),
diff_stats.out.packets, diff_stats.out.lost_packets,
diff_stats.out.retx_packets, diff_stats.in.packets,
bs->count, bs->min, bs->max, bs->avg);
*conn->fc_last_stats = conn->fc_stats;
memset(bs, 0, sizeof(*bs));
}
#endif
static const struct headers_stream_callbacks headers_callbacks =
{
.hsc_on_headers = headers_stream_on_incoming_headers,
.hsc_on_push_promise = headers_stream_on_push_promise,
.hsc_on_priority = headers_stream_on_priority,
.hsc_on_stream_error = headers_stream_on_stream_error,
.hsc_on_conn_error = headers_stream_on_conn_error,
.hsc_on_enable_push = headers_stream_on_enable_push,
};
static const struct headers_stream_callbacks *headers_callbacks_ptr = &headers_callbacks;
static const struct conn_iface full_conn_iface = {
.ci_abort = full_conn_ci_abort,
.ci_abort_error = full_conn_ci_abort_error,
.ci_ack_rollback = full_conn_ci_ack_rollback,
.ci_ack_snapshot = full_conn_ci_ack_snapshot,
.ci_can_write_ack = full_conn_ci_can_write_ack,
.ci_cancel_pending_streams
= full_conn_ci_cancel_pending_streams,
.ci_client_call_on_new = full_conn_ci_client_call_on_new,
.ci_close = full_conn_ci_close,
.ci_destroy = full_conn_ci_destroy,
.ci_get_stream_by_id = full_conn_ci_get_stream_by_id,
.ci_get_engine = full_conn_ci_get_engine,
.ci_get_path = full_conn_ci_get_path,
#if LSQUIC_CONN_STATS
.ci_get_stats = full_conn_ci_get_stats,
.ci_log_stats = full_conn_ci_log_stats,
#endif
.ci_going_away = full_conn_ci_going_away,
.ci_hsk_done = full_conn_ci_hsk_done,
.ci_internal_error = full_conn_ci_internal_error,
.ci_is_push_enabled = full_conn_ci_is_push_enabled,
.ci_is_tickable = full_conn_ci_is_tickable,
.ci_make_stream = full_conn_ci_make_stream,
.ci_n_avail_streams = full_conn_ci_n_avail_streams,
.ci_n_pending_streams = full_conn_ci_n_pending_streams,
.ci_next_packet_to_send = full_conn_ci_next_packet_to_send,
.ci_next_tick_time = full_conn_ci_next_tick_time,
.ci_packet_in = full_conn_ci_packet_in,
.ci_packet_not_sent = full_conn_ci_packet_not_sent,
.ci_packet_sent = full_conn_ci_packet_sent,
.ci_record_addrs = full_conn_ci_record_addrs,
/* gQUIC connection does not need this functionality because it only
* uses one CID and it's liveness is updated automatically by the
* caller when packets come in.
*/
.ci_report_live = NULL,
.ci_status = full_conn_ci_status,
.ci_tick = full_conn_ci_tick,
.ci_write_ack = full_conn_ci_write_ack,
.ci_push_stream = full_conn_ci_push_stream,
.ci_tls_alert = full_conn_ci_tls_alert,
};
static const struct conn_iface *full_conn_iface_ptr = &full_conn_iface;
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