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litespeed-quic/src/liblsquic/lsquic_full_conn.c

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/* Copyright (c) 2017 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 <netinet/in.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/time.h>
#include "lsquic_types.h"
#include "lsquic.h"
#include "lsquic_alarmset.h"
#include "lsquic_packet_common.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_stream.h"
#include "lsquic_senhist.h"
#include "lsquic_rtt.h"
#include "lsquic_cubic.h"
#include "lsquic_pacer.h"
#include "lsquic_send_ctl.h"
#include "lsquic_set.h"
#include "lsquic_malo.h"
#include "lsquic_chsk_stream.h"
#include "lsquic_handshake.h"
#include "lsquic_headers_stream.h"
#include "lsquic_frame_common.h"
#include "lsquic_frame_reader.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_hash.h"
#include "lsquic_conn.h"
#include "lsquic_conn_public.h"
#include "lsquic_ver_neg.h"
#include "lsquic_full_conn.h"
#define LSQUIC_LOGGER_MODULE LSQLM_CONN
#define LSQUIC_LOG_CONN_ID conn->fc_conn.cn_cid
#include "lsquic_logger.h"
enum { STREAM_IF_STD, STREAM_IF_HSK, STREAM_IF_HDR, N_STREAM_IFS };
#define MAX_ANY_PACKETS_SINCE_LAST_ACK 20
#define MAX_RETR_PACKETS_SINCE_LAST_ACK 2
#define ACK_TIMEOUT 25000
#define TIME_BETWEEN_PINGS 15000000
#define IDLE_TIMEOUT 30000000
/* 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),
FC_ERROR = (1 << 3),
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 */
};
#define FC_IMMEDIATE_CLOSE_FLAGS \
(FC_TIMED_OUT|FC_ERROR|FC_ABORTED)
#if LSQUIC_KEEP_STREAM_HISTORY
#define KEEP_CLOSED_STREAM_HISTORY 0
#endif
#if KEEP_CLOSED_STREAM_HISTORY
struct stream_history
{
uint32_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
struct full_conn
{
struct lsquic_conn fc_conn;
struct lsquic_hash *fc_streams;
struct lsquic_rechist fc_rechist;
struct {
const struct lsquic_stream_if *stream_if;
void *stream_if_ctx;
} fc_stream_ifs[N_STREAM_IFS];
lsquic_conn_ctx_t *fc_conn_ctx;
struct lsquic_send_ctl fc_send_ctl;
struct lsquic_conn_public fc_pub;
lsquic_alarmset_t fc_alset;
lsquic_set32_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;
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 of packets received since last ACK sent: */
unsigned fc_n_slack_all;
/* Number ackable packets received since last ACK was sent: */
unsigned fc_n_slack_akbl;
unsigned fc_n_delayed_streams;
unsigned fc_n_cons_unretx;
uint32_t fc_last_stream_id;
uint32_t fc_max_peer_stream_id;
uint32_t fc_goaway_stream_id;
struct ver_neg fc_ver_neg;
union {
struct client_hsk_ctx client;
} fc_hsk_ctx;
#if FULL_CONN_STATS
struct {
unsigned n_all_packets_in,
n_packets_out,
n_undec_packets,
n_dup_packets,
n_err_packets;
unsigned long stream_data_sz;
} fc_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
};
#define ABORT_WITH_FLAG(conn, flag, errmsg...) do { \
(conn)->fc_flags |= flag; \
LSQ_ERROR("Abort connection: " errmsg); \
} while (0)
#define ABORT_ERROR(errmsg...) ABORT_WITH_FLAG(conn, FC_ERROR, errmsg)
#define ABORT_TIMEOUT(errmsg...) ABORT_WITH_FLAG(conn, FC_TIMED_OUT, errmsg)
static void
idle_alarm_expired (void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
ping_alarm_expired (void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
handshake_alarm_expired (void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static void
ack_alarm_expired (void *ctx, lsquic_time_t expiry, lsquic_time_t now);
static lsquic_stream_t *
new_stream (struct full_conn *conn, uint32_t stream_id);
static void
reset_ack_state (struct full_conn *conn);
static const struct headers_stream_callbacks headers_callbacks;
#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, uint32_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
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 void
set_versions (struct full_conn *conn, unsigned versions)
{
conn->fc_ver_neg.vn_supp = versions;
conn->fc_ver_neg.vn_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;
LSQ_DEBUG("negotiating version %s",
lsquic_ver2str[conn->fc_ver_neg.vn_ver]);
}
static void
init_ver_neg (struct full_conn *conn, unsigned versions)
{
set_versions(conn, versions);
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.
*/
static void
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_streams); el;
el = lsquic_hash_next(conn->fc_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 %u",
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
&& (conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE)
&& 0 == 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.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 != 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);
conn_on_peer_config(conn, cfcw, sfcw, mids);
if (conn->fc_flags & FC_HTTP)
maybe_send_settings(conn);
return 0;
}
static const struct conn_iface full_conn_iface;
static struct full_conn *
new_conn_common (lsquic_cid_t cid, struct lsquic_engine_public *enpub,
const struct lsquic_stream_if *stream_if,
void *stream_if_ctx, unsigned flags,
unsigned short max_packet_size)
{
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_cid = cid;
conn->fc_conn.cn_pack_size = max_packet_size;
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;
conn->fc_pub.packet_out_malo =
lsquic_malo_create(sizeof(struct lsquic_packet_out));
conn->fc_stream_ifs[STREAM_IF_STD].stream_if = stream_if;
conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx = 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.rw_streams);
TAILQ_INIT(&conn->fc_pub.service_streams);
lsquic_conn_cap_init(&conn->fc_pub.conn_cap, LSQUIC_MIN_FCW);
lsquic_alarmset_init(&conn->fc_alset, cid);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_IDLE, idle_alarm_expired, conn);
lsquic_alarmset_init_alarm(&conn->fc_alset, AL_ACK, 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_set32_init(&conn->fc_closed_stream_ids[0]);
lsquic_set32_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,
&conn->fc_ver_neg, &conn->fc_pub, conn->fc_conn.cn_pack_size);
conn->fc_streams = lsquic_hash_create();
if (!conn->fc_streams)
goto cleanup_on_error;
lsquic_rechist_init(&conn->fc_rechist, cid);
if (conn->fc_flags & FC_HTTP)
{
conn->fc_pub.hs = lsquic_headers_stream_new(
!!(conn->fc_flags & FC_SERVER), conn->fc_pub.mm, conn->fc_settings,
&headers_callbacks, conn);
if (!conn->fc_pub.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.hs;
headers_stream = new_stream(conn, LSQUIC_STREAM_HEADERS);
if (!headers_stream)
goto cleanup_on_error;
}
else
{
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if = stream_if;
conn->fc_stream_ifs[STREAM_IF_HDR].stream_if_ctx = stream_if_ctx;
}
if (conn->fc_settings->es_support_push)
conn->fc_flags |= FC_SUPPORT_PUSH;
conn->fc_conn.cn_if = &full_conn_iface;
return conn;
cleanup_on_error:
saved_errno = errno;
if (conn->fc_streams)
lsquic_hash_destroy(conn->fc_streams);
lsquic_rechist_cleanup(&conn->fc_rechist);
if (conn->fc_flags & FC_HTTP)
{
if (conn->fc_pub.hs)
lsquic_headers_stream_destroy(conn->fc_pub.hs);
if (headers_stream)
lsquic_stream_destroy(headers_stream);
}
memset(conn, 0, sizeof(*conn));
free(conn);
errno = saved_errno;
return NULL;
}
struct lsquic_conn *
full_conn_client_new (struct lsquic_engine_public *enpub,
const struct lsquic_stream_if *stream_if,
void *stream_if_ctx, unsigned flags,
const char *hostname, unsigned short max_packet_size)
{
struct full_conn *conn;
lsquic_cid_t cid;
cid = generate_cid();
conn = new_conn_common(cid, enpub, stream_if, stream_if_ctx, flags,
max_packet_size);
if (!conn)
return NULL;
conn->fc_conn.cn_enc_session = new_enc_session_c(hostname, cid,
conn->fc_enpub);
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 = LSQUIC_STREAM_HEADERS; /* Client goes 5, 7, 9.... */
else
conn->fc_last_stream_id = LSQUIC_STREAM_HANDSHAKE;
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;
/* TODO the client does not know how to perform version negotiation */
init_ver_neg(conn, conn->fc_settings->es_versions);
conn->fc_conn.cn_pf = select_pf_by_ver(conn->fc_ver_neg.vn_ver);
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(conn, LSQUIC_STREAM_HANDSHAKE))
{
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;
conn->fc_conn_ctx = stream_if->on_new_conn(stream_if_ctx, &conn->fc_conn);
LSQ_INFO("Created new client connection");
EV_LOG_CONN_EVENT(cid, "created full connection");
return &conn->fc_conn;
}
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_streams); el;
el = lsquic_hash_next(conn->fc_streams))
{
stream = lsquic_hashelem_getdata(el);
ours = (1 & stream->id) ^ is_server;
if (ours ^ peer)
count += !lsquic_stream_is_closed(stream);
}
return count;
}
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;
LSQ_DEBUG("destroy connection");
conn->fc_flags |= FC_CLOSING;
lsquic_set32_cleanup(&conn->fc_closed_stream_ids[0]);
lsquic_set32_cleanup(&conn->fc_closed_stream_ids[1]);
for (el = lsquic_hash_first(conn->fc_streams); el;
el = lsquic_hash_next(conn->fc_streams))
{
stream = lsquic_hashelem_getdata(el);
lsquic_stream_destroy(stream);
}
lsquic_hash_destroy(conn->fc_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.hs)
lsquic_headers_stream_destroy(conn->fc_pub.hs);
lsquic_send_ctl_cleanup(&conn->fc_send_ctl);
lsquic_rechist_cleanup(&conn->fc_rechist);
if (conn->fc_conn.cn_enc_session)
free_enc_session(conn->fc_conn.cn_enc_session);
lsquic_malo_destroy(conn->fc_pub.packet_out_malo);
#if FULL_CONN_STATS
LSQ_NOTICE("received %u packets, of which %u were not decryptable, %u were "
"dups and %u were errors; sent %u packets, avg stream data per outgoing"
" packet is %lu bytes",
conn->fc_stats.n_all_packets_in, conn->fc_stats.n_undec_packets,
conn->fc_stats.n_dup_packets, conn->fc_stats.n_err_packets,
conn->fc_stats.n_packets_out,
conn->fc_stats.stream_data_sz / conn->fc_stats.n_packets_out);
#endif
EV_LOG_CONN_EVENT(LSQUIC_LOG_CONN_ID, "full connection destroyed");
free(conn);
}
static void
conn_mark_stream_closed (struct full_conn *conn, uint32_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_set32_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, uint32_t stream_id)
{
int idx = stream_id & 1;
stream_id >>= 1;
return lsquic_set32_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, now + ACK_TIMEOUT);
LSQ_DEBUG("ACK alarm set to %"PRIu64, now + ACK_TIMEOUT);
}
static void
ack_alarm_expired (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_conn.cn_version < LSQVER_039 /* Since Q039 do not ack ACKs */
&& conn->fc_n_slack_all >= MAX_ANY_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);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
conn->fc_flags |= FC_ACK_QUEUED;
LSQ_DEBUG("ACK queued: ackable: %u; all: %u; had_miss: %d; "
"was_missing: %d; n_stop_waiting: %u",
conn->fc_n_slack_akbl, conn->fc_n_slack_all,
!!(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_all = 0;
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);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
LSQ_DEBUG("ACK state reset");
}
static lsquic_stream_t *
new_stream_ext (struct full_conn *conn, uint32_t stream_id, int if_idx,
enum stream_ctor_flags stream_ctor_flags)
{
lsquic_stream_t *stream = lsquic_stream_new_ext(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,
conn->fc_cfg.max_stream_send, stream_ctor_flags);
if (stream)
lsquic_hash_insert(conn->fc_streams, &stream->id, sizeof(stream->id),
stream);
return stream;
}
static lsquic_stream_t *
new_stream (struct full_conn *conn, uint32_t stream_id)
{
enum stream_ctor_flags flags;
int idx;
switch (stream_id)
{
case LSQUIC_STREAM_HANDSHAKE:
idx = STREAM_IF_HSK;
flags = SCF_DI_AUTOSWITCH|SCF_CALL_ON_NEW;
break;
case LSQUIC_STREAM_HEADERS:
idx = STREAM_IF_HDR;
flags = SCF_DI_AUTOSWITCH|SCF_CALL_ON_NEW;
if (!(conn->fc_flags & FC_HTTP) &&
conn->fc_enpub->enp_settings.es_rw_once)
flags |= SCF_DISP_RW_ONCE;
break;
default:
idx = STREAM_IF_STD;
flags = SCF_DI_AUTOSWITCH|SCF_CALL_ON_NEW;
if (conn->fc_enpub->enp_settings.es_rw_once)
flags |= SCF_DISP_RW_ONCE;
break;
}
return new_stream_ext(conn, stream_id, idx, flags);
}
static uint32_t
generate_stream_id (struct full_conn *conn)
{
conn->fc_last_stream_id += 2;
return conn->fc_last_stream_id;
}
unsigned
lsquic_conn_n_pending_streams (const lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
return conn->fc_n_delayed_streams;
}
unsigned
lsquic_conn_cancel_pending_streams (lsquic_conn_t *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);
}
void
lsquic_conn_make_stream (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
unsigned stream_count = count_streams(conn, 0);
if (stream_count < conn->fc_cfg.max_streams_out)
{
if (!new_stream(conn, generate_stream_id(conn)))
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, uint32_t stream_id)
{
struct lsquic_hash_elem *el;
el = lsquic_hash_find(conn->fc_streams, &stream_id, sizeof(stream_id));
if (el)
return lsquic_hashelem_getdata(el);
else
return NULL;
}
lsquic_stream_t *
lsquic_conn_get_stream_by_id (lsquic_conn_t *lconn, uint32_t stream_id)
{
struct full_conn *conn = (struct full_conn *) lconn;
return find_stream_by_id(conn, stream_id);
}
static unsigned
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)
{
if (conn->fc_conn.cn_version >= LSQVER_038)
return count_zero_bytes(p, len);
if (lsquic_is_zero(p, len))
{
EV_LOG_PADDING_FRAME_IN(LSQUIC_LOG_CONN_ID, len);
return len;
}
else
return 0;
}
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");
return 1;
}
static int
is_peer_initiated (const struct full_conn *conn, uint32_t stream_id)
{
unsigned is_server = !!(conn->fc_flags & FC_SERVER);
int peer_initiated = (stream_id & 1) == is_server;
return peer_initiated;
}
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;
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_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 #%u", stream_frame->stream_id);
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 (conn_is_stream_closed(conn, stream_frame->stream_id))
{
LSQ_DEBUG("drop frame for closed stream %u", 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)
{
ABORT_ERROR("incoming stream would exceed limit: %u",
conn->fc_cfg.max_streams_in);
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: drop frame for new stream %u",
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);
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");
return 0;
}
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_streams); el;
el = lsquic_hash_next(conn->fc_streams))
{
stream = lsquic_hashelem_getdata(el);
if (stream->id > 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)
{
uint32_t error_code, stream_id;
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: %u, 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;
size_t sz;
buf = malloc(0x1000);
if (buf)
{
lsquic_senhist_tostr(&conn->fc_send_ctl.sc_senhist, buf, 0x1000);
LSQ_WARN("send history: %s", buf);
hexdump(p, parsed_len, buf, 0x1000);
LSQ_WARN("raw ACK frame:\n%s", buf);
free(buf);
}
else
LSQ_WARN("malloc failed");
buf = acki2str(acki, &sz);
if (buf)
{
LSQ_WARN("parsed ACK frame: %.*s", (int) sz, buf);
free(buf);
}
else
LSQ_WARN("malloc failed");
}
static unsigned
process_ack_frame (struct full_conn *conn, lsquic_packet_in_t *packet_in,
const unsigned char *p, size_t len)
{
const int parsed_len = conn->fc_conn.cn_pf->pf_parse_ack_frame(p, len,
conn->fc_pub.mm->acki);
if (parsed_len < 0)
return 0;
if (packet_in->pi_packno > conn->fc_max_ack_packno)
{
EV_LOG_ACK_FRAME_IN(LSQUIC_LOG_CONN_ID, conn->fc_pub.mm->acki);
if (0 == lsquic_send_ctl_got_ack(&conn->fc_send_ctl,
conn->fc_pub.mm->acki, packet_in->pi_received))
{
conn->fc_max_ack_packno = packet_in->pi_packno;
if (lsquic_send_ctl_largest_ack2ed(&conn->fc_send_ctl))
lsquic_rechist_stop_wait(&conn->fc_rechist,
lsquic_send_ctl_largest_ack2ed(&conn->fc_send_ctl) + 1);
}
else
{
log_invalid_ack_frame(conn, p, parsed_len, conn->fc_pub.mm->acki);
ABORT_ERROR("Received invalid ACK");
}
}
else
LSQ_DEBUG("Ignore old ack (max %"PRIu64")", conn->fc_max_ack_packno);
return parsed_len;
}
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 lsquic_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)
{
uint32_t stream_id;
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 %u as blocked", stream_id);
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)
{
lsquic_stream_t *stream;
struct lsquic_hash_elem *el;
uint32_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,
&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: %u; reason: %.*s)",
error_code, (int) reason_len, (const char *) p + reason_off);
conn->fc_flags |= FC_RECV_CLOSE;
if (!(conn->fc_flags & FC_CLOSING))
{
for (el = lsquic_hash_first(conn->fc_streams); el;
el = lsquic_hash_next(conn->fc_streams))
{
stream = lsquic_hashelem_getdata(el);
lsquic_stream_shutdown_internal(stream);
}
conn->fc_flags |= 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)
{
uint32_t stream_id, error_code;
uint64_t offset;
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: %u; offset: 0x%"PRIX64, stream_id,
offset);
if (0 == stream_id)
{ /* Follow reference implementation and ignore this apparently
* invalid frame.
*/
return parsed_len;
}
if (LSQUIC_STREAM_HANDSHAKE == stream_id ||
((conn->fc_flags & FC_HTTP) && LSQUIC_STREAM_HEADERS == stream_id))
{
ABORT_ERROR("received reset on static stream %u", stream_id);
return 0;
}
stream = find_stream_by_id(conn, stream_id);
if (!stream)
{
if (conn_is_stream_closed(conn, stream_id))
{
LSQ_DEBUG("got reset frame for closed stream %u", stream_id);
return parsed_len;
}
if (!is_peer_initiated(conn, stream_id))
{
ABORT_ERROR("received reset for never-initiated stream %u",
stream_id);
return 0;
}
stream = new_stream(conn, stream_id);
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;
}
lsquic_send_ctl_reset_stream(&conn->fc_send_ctl, stream_id);
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)
{
uint32_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: %u; 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 %u "
"(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_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 = conn->fc_conn.cn_pf->pf_parse_frame_type(p[0]);
packet_in->pi_frame_types |= 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 = packet_in_ver_first(packet_in, &vi, &ver_tag); s;
s = 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]);
}
}
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)
{
ABORT_ERROR("client does not support any of the server-specified "
"versions");
return;
}
set_versions(conn, versions);
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 lsquic_packno_bits bits;
cur_packno = packet_in->pi_packno;
max_packno = lsquic_rechist_largest_packno(&conn->fc_rechist);
bits = lsquic_packet_in_packno_bits(packet_in);
packet_in->pi_packno = restore_packno(cur_packno, bits, max_packno);
LSQ_DEBUG("reconstructed (bits: %u, packno: %"PRIu64", max: %"PRIu64") "
"to %"PRIu64"", bits, cur_packno, max_packno, packet_in->pi_packno);
}
static int
conn_decrypt_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
return lsquic_conn_decrypt_packet(&conn->fc_conn, conn->fc_enpub,
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
process_regular_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
enum received_st st;
int was_missing;
reconstruct_packet_number(conn, packet_in);
EV_LOG_PACKET_IN(LSQUIC_LOG_CONN_ID, packet_in);
#if FULL_CONN_STATS
++conn->fc_stats.n_all_packets_in;
#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) &&
0 != conn_decrypt_packet(conn, packet_in))
{
LSQ_INFO("could not decrypt packet");
#if FULL_CONN_STATS
++conn->fc_stats.n_undec_packets;
#endif
return 0;
}
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))
{
was_missing = packet_in->pi_packno !=
lsquic_rechist_largest_packno(&conn->fc_rechist);
conn->fc_n_slack_all += 1;
conn->fc_n_slack_akbl +=
!!(packet_in->pi_frame_types & QFRAME_ACKABLE_MASK);
try_queueing_ack(conn, was_missing, packet_in->pi_received);
}
return 0;
case REC_ST_DUP:
#if FULL_CONN_STATS
++conn->fc_stats.n_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 FULL_CONN_STATS
++conn->fc_stats.n_err_packets;
#endif
LSQ_INFO("error processing packet %"PRIu64, packet_in->pi_packno);
return -1;
}
}
static int
process_incoming_packet (struct full_conn *conn, lsquic_packet_in_t *packet_in)
{
LSQ_DEBUG("Processing packet %"PRIu64, packet_in->pi_packno);
/* See flowchart in Section 4.1 of [draft-ietf-quic-transport-00]. We test
* for the common case first.
*/
const unsigned flags = lsquic_packet_in_public_flags(packet_in);
if (0 == (flags & (PACKET_PUBLIC_FLAGS_RST|PACKET_PUBLIC_FLAGS_VERSION)))
{
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;
if (conn->fc_conn.cn_version >= LSQVER_037)
{
assert(!(conn->fc_flags & FC_NSTP)); /* This bit off at start */
if (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]);
}
return process_regular_packet(conn, packet_in);
}
else if (flags & PACKET_PUBLIC_FLAGS_RST)
{
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 (void *ctx, lsquic_time_t expiry, lsquic_time_t now)
{
struct full_conn *conn = ctx;
LSQ_DEBUG("connection timed out");
conn->fc_flags |= FC_TIMED_OUT;
}
static void
handshake_alarm_expired (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 (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 void
zero_pad_packet (lsquic_packet_out_t *packet_out)
{
memset(packet_out->po_data + packet_out->po_data_sz, 0,
packet_out->po_n_alloc - packet_out->po_data_sz);
packet_out->po_data_sz = packet_out->po_n_alloc;
packet_out->po_frame_types |= 1 << QUIC_FRAME_PADDING;
}
#define MAX_STREAM_FRAME_HEADER (1 + 4 + 8 + 2)
#define MIN_STREAM_FRAME_PAYLOAD 10 /* Some sane value */
#define MIN(a, b) ((a) < (b) ? (a) : (b))
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;
assert(need_at_least <= QUIC_MAX_PAYLOAD_SZ);
packet_out = lsquic_send_ctl_get_writeable_packet(&conn->fc_send_ctl,
need_at_least, &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, QUIC_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;
}
packet_out->po_data_sz += sz;
packet_out->po_frame_types |= 1 << QUIC_FRAME_WINDOW_UPDATE;
LSQ_DEBUG("wrote WUF: stream %u; 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, QUIC_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;
}
packet_out->po_data_sz += 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
generate_goaway_frame (struct full_conn *conn)
{
int reason_len = 0;
lsquic_packet_out_t *packet_out =
get_writeable_packet(conn, QUIC_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;
}
packet_out->po_data_sz += 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: %u", conn->fc_max_peer_stream_id);
}
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);
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), 16 /* PEER_GOING_AWAY */,
NULL, 0);
if (sz < 0) {
ABORT_ERROR("generate_connection_close_packet failed");
return;
}
packet_out->po_data_sz += 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, uint32_t stream_id)
{
lsquic_packet_out_t *packet_out =
get_writeable_packet(conn, QUIC_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;
}
packet_out->po_data_sz += sz;
packet_out->po_frame_types |= 1 << QUIC_FRAME_BLOCKED;
LSQ_DEBUG("wrote blocked frame: stream %u", 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, QUIC_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,
stream->tosend_off, stream->error_code);
if (sz < 0) {
ABORT_ERROR("gen_rst_frame failed");
return 0;
}
packet_out->po_data_sz += 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, 0);
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 %u; offset 0x%"PRIX64"; error code 0x%X",
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_blocked_frame failed");
return;
}
packet_out->po_data_sz += sz;
packet_out->po_frame_types |= 1 << QUIC_FRAME_PING;
LSQ_DEBUG("wrote PING frame");
}
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: */
packet_out = get_writeable_packet(conn, 1 + packno_bits2len(PACKNO_LEN_1));
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 = 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;
}
packet_out->po_data_sz += 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
generate_stream_frame (struct full_conn *conn, lsquic_stream_t *stream)
{
lsquic_packet_out_t *packet_out;
size_t n_to_send, need_at_least;
int len, s;
unsigned short off;
/* Send one packet's worth */
n_to_send = lsquic_stream_tosend_sz(stream);
assert(n_to_send > 0 || lsquic_stream_tosend_fin(stream)); /* Otherwise, why are we called? */
need_at_least =
MAX_STREAM_FRAME_HEADER + MIN(MIN_STREAM_FRAME_PAYLOAD, n_to_send);
packet_out = get_writeable_packet(conn, need_at_least);
if (!packet_out)
return 0;
off = packet_out->po_data_sz;
len = conn->fc_conn.cn_pf->pf_gen_stream_frame(
packet_out->po_data + packet_out->po_data_sz,
lsquic_packet_out_avail(packet_out), stream->id,
lsquic_stream_tosend_offset(stream),
(gsf_fin_f) lsquic_stream_tosend_fin,
(gsf_size_f) lsquic_stream_tosend_sz,
(gsf_read_f) lsquic_stream_tosend_read, stream);
if (len < 0)
{
ABORT_ERROR("gen_stream_frame failed");
return 0;
}
#if FULL_CONN_STATS
conn->fc_stats.stream_data_sz += len -
conn->fc_conn.cn_pf->pf_parse_stream_frame_header_sz(
packet_out->po_data[packet_out->po_data_sz]);
#endif
EV_LOG_GENERATED_STREAM_FRAME(LSQUIC_LOG_CONN_ID, conn->fc_conn.cn_pf,
packet_out->po_data + packet_out->po_data_sz, len);
packet_out->po_data_sz += len;
packet_out->po_frame_types |= 1 << QUIC_FRAME_STREAM;
s = lsquic_packet_out_add_stream(packet_out, conn->fc_pub.mm, stream,
QUIC_FRAME_STREAM, off);
if (s != 0)
{
ABORT_ERROR("adding stream to packet failed: %s", strerror(errno));
return 0;
}
lsquic_stream_stream_frame_sent(stream);
LSQ_DEBUG("Put %d bytes of data from stream %u into packet on outgoing "
"queue", len, stream->id);
return 1;
}
/* TODO I think we can separate this function into two functions: one that
* processes STREAM_SEND_WUF, STREAM_SEND_BLOCKED, and STREAM_SEND_RST
* queues, and one that processes STREAM_SEND_DATA queue, as the four flags
* are not dependent upon each other. Double-check this and implement.
*/
static int
process_stream_ready_to_send (struct full_conn *conn, lsquic_stream_t *stream,
int send_data)
{
int r = 1, written;
if (stream->stream_flags & STREAM_SEND_WUF)
r &= generate_wuf_stream(conn, stream);
if (send_data && (stream->stream_flags & STREAM_SEND_DATA))
{
if (LSQUIC_STREAM_HANDSHAKE == stream->id)
{
#if LSQUIC_STREAM_HANDSHAKE
/* Full connection implies that the server has completed the
* handshake:
*/
assert(0 == (conn->fc_flags & FC_SERVER));
#endif
/* Handshake messages are sent in brand-new packets. If handshake
* is not complete, the packet is zero-padded.
*/
lsquic_packet_out_t *packet_out = get_writeable_packet(conn, 0);
written = generate_stream_frame(conn, stream);
r &= written;
if (written)
{
packet_out->po_flags |= PO_HELLO;
LSQ_DEBUG("packet %"PRIu64" is carrying CHLO data",
packet_out->po_packno);
if (!(conn->fc_conn.cn_flags & LSCONN_HANDSHAKE_DONE))
{
zero_pad_packet(packet_out);
LSQ_DEBUG("zero-padded packet %"PRIu64,
packet_out->po_packno);
}
}
assert(packet_out ==
lsquic_send_ctl_last_scheduled(&conn->fc_send_ctl));
}
else
r &= generate_stream_frame(conn, stream);
}
if (stream->stream_flags & STREAM_SEND_BLOCKED)
r &= generate_stream_blocked_frame(conn, stream);
if (stream->stream_flags & STREAM_SEND_RST)
r &= generate_rst_stream_frame(conn, stream);
return r;
}
/* Return 1 if any STREAM frames were packetized, 0 otherwise. */
static int
process_streams_ready_to_send (struct full_conn *conn)
{
lsquic_stream_t *stream;
struct stream_prio_iter spi;
int stream_frames_packetized;
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),
STREAM_SENDING_FLAGS, conn->fc_conn.cn_cid, "send");
/* The first iteration takes care of all WINDOW_UPDATE, BLOCKED, and
* RST_STREAM frames. After that, we turn on priority level exhaustion
* mechanism in the iterator and send data.
*/
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
if (!process_stream_ready_to_send(conn, stream, 0))
return 0;
lsquic_spi_exhaust_on(&spi);
stream_frames_packetized = 0;
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
if (process_stream_ready_to_send(conn, stream, 1))
++stream_frames_packetized;
else
break;
return stream_frames_packetized > 0;
}
static void
service_streams (struct full_conn *conn)
{
struct lsquic_hash_elem *el;
lsquic_stream_t *stream, *next;
int n_our_destroyed = 0;
for (stream = TAILQ_FIRST(&conn->fc_pub.service_streams); stream; stream = next)
{
next = TAILQ_NEXT(stream, next_service_stream);
if (stream->stream_flags & STREAM_CALL_ONCLOSE)
lsquic_stream_call_on_close(stream);
if (stream->stream_flags & STREAM_FREE_STREAM)
{
n_our_destroyed += is_our_stream(conn, stream);
TAILQ_REMOVE(&conn->fc_pub.service_streams, stream, next_service_stream);
el = lsquic_hash_find(conn->fc_streams, &stream->id, sizeof(stream->id));
if (el)
lsquic_hash_erase(conn->fc_streams, el);
conn_mark_stream_closed(conn, stream->id);
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);
}
else
while (n_our_destroyed && conn->fc_n_delayed_streams)
{
--n_our_destroyed;
--conn->fc_n_delayed_streams;
LSQ_DEBUG("creating delayed stream");
if (!new_stream(conn, generate_stream_id(conn)))
{
ABORT_ERROR("%s: cannot create new stream: %s", __func__,
strerror(errno));
break;
}
assert(count_streams(conn, 0) <= conn->fc_cfg.max_streams_out);
}
}
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 int
dispatch_stream_rw_events (struct full_conn *conn, lsquic_stream_t *stream)
{
struct stream_rw_prog_status saved_status;
int is_reset, progress_made;
is_reset = lsquic_stream_is_reset(stream);
lsquic_stream_get_rw_prog_status(stream, &saved_status);
lsquic_stream_dispatch_rw_events(stream);
progress_made = lsquic_stream_progress_was_made(stream, &saved_status);
if (!is_reset && lsquic_stream_is_reset(stream))
lsquic_send_ctl_reset_stream(&conn->fc_send_ctl, stream->id);
return progress_made;
}
/* Return 1 if progress was made, 0 otherwise */
static int
process_streams_rw_events (struct full_conn *conn)
{
lsquic_stream_t *stream;
struct filter_stream_ctx fctx;
struct stream_prio_iter spi;
int progress_count;
if (TAILQ_EMPTY(&conn->fc_pub.rw_streams))
return 0;
progress_count = 0;
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.rw_streams),
TAILQ_LAST(&conn->fc_pub.rw_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_rw_stream),
STREAM_RW_EVENT_FLAGS, conn->fc_conn.cn_cid, "rw-1");
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
progress_count +=
dispatch_stream_rw_events(conn, stream);
/* If new streams were created as result of the RW dispatching above,
* process these new streams.
*/
if (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_ext(&spi, TAILQ_FIRST(&conn->fc_pub.rw_streams),
TAILQ_LAST(&conn->fc_pub.rw_streams, lsquic_streams_tailq),
(uintptr_t) &TAILQ_NEXT((lsquic_stream_t *) NULL, next_rw_stream),
STREAM_RW_EVENT_FLAGS, filter_out_old_streams, &fctx,
conn->fc_conn.cn_cid, "rw-2");
for (stream = lsquic_spi_first(&spi); stream;
stream = lsquic_spi_next(&spi))
progress_count +=
dispatch_stream_rw_events(conn, stream);
}
return progress_count > 0;
}
/* Return 1 if progress was made, 0 otherwise. */
static int
process_hsk_stream_rw_events (struct full_conn *conn)
{
lsquic_stream_t *stream;
TAILQ_FOREACH(stream, &conn->fc_pub.rw_streams, next_rw_stream)
if (LSQUIC_STREAM_HANDSHAKE == stream->id)
return dispatch_stream_rw_events(conn, stream);
return 0;
}
#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
generate_ack_frame (struct full_conn *conn)
{
lsquic_packet_out_t *packet_out;
lsquic_time_t now;
int has_missing, w;
packet_out = lsquic_send_ctl_new_packet_out(&conn->fc_send_ctl, 0);
if (!packet_out)
{
ABORT_ERROR("cannot allocate packet: %s", strerror(errno));
return;
}
lsquic_send_ctl_scheduled_one(&conn->fc_send_ctl, packet_out);
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);
if (w < 0) {
ABORT_ERROR("generating ACK frame failed: %d", errno);
return;
}
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);
packet_out->po_frame_types |= 1 << QUIC_FRAME_ACK;
packet_out->po_data_sz += 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_conn.cn_version >= LSQVER_039 &&
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;
}
}
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_streams) == 0
&& 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);
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));
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
{
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), error_code,
error_reason, error_reason ? strlen(error_reason) : 0);
if (sz < 0) {
LSQ_WARN("%s failed", __func__);
return TICK_CLOSE;
}
packet_out->po_data_sz += 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 enum tick_st
full_conn_ci_tick (lsquic_conn_t *lconn, lsquic_time_t now)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_packet_out_t *last_packet_out;
int have_delayed_packets;
unsigned n;
int progress_made;
enum tick_st progress_tick = 0;
#define CLOSE_IF_NECESSARY() do { \
if (conn->fc_flags & FC_IMMEDIATE_CLOSE_FLAGS) \
return progress_tick | immediate_close(conn); \
} 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__); \
return progress_tick | TICK_QUIET; \
} \
else \
{ \
LSQ_DEBUG("used up packet allowance, sending now (line %d)",\
__LINE__); \
return progress_tick | TICK_SEND; \
} \
} \
} while (0)
assert(!(conn->fc_conn.cn_flags & LSCONN_RW_PENDING));
lsquic_send_ctl_tick(&conn->fc_send_ctl, now);
CLOSE_IF_NECESSARY();
if (!(conn->fc_flags & FC_SERVER))
{
lsquic_alarmset_unset(&conn->fc_alset, AL_PING);
lsquic_send_ctl_sanity_check(&conn->fc_send_ctl);
}
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)
progress_made = process_streams_rw_events(conn);
else
progress_made = process_hsk_stream_rw_events(conn);
progress_tick |= progress_made << TICK_BIT_PROGRESS;
CLOSE_IF_NECESSARY();
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_squeeze_sched(
&conn->fc_send_ctl);
if ((conn->fc_flags & FC_ACK_QUEUED) ||
lsquic_send_ctl_lost_ack(&conn->fc_send_ctl))
{
if (have_delayed_packets)
lsquic_send_ctl_reset_packnos(&conn->fc_send_ctl);
/* ACK frame generation fails with an error if it does not fit into
* a single packet (it always should fit).
*/
generate_ack_frame(conn);
CLOSE_IF_NECESSARY();
reset_ack_state(conn);
/* 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);
}
}
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.
*/
return progress_tick | TICK_SEND;
RETURN_IF_OUT_OF_PACKETS();
/* 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();
RETURN_IF_OUT_OF_PACKETS();
if (conn->fc_conn.cn_flags & LSCONN_SEND_BLOCKED)
{
if (generate_blocked_frame(conn, 0))
conn->fc_conn.cn_flags &= ~LSCONN_SEND_BLOCKED;
else
RETURN_IF_OUT_OF_PACKETS();
}
if (!TAILQ_EMPTY(&conn->fc_pub.sending_streams))
{
progress_made = process_streams_ready_to_send(conn);
progress_tick |= progress_made << TICK_BIT_PROGRESS;
/* If last packet on the queue contains a stream-related frame, mark it
* unwriteable to force a new packet allocation on the next tick. This
* is to prevent more than one STREAM or RST_STREAM frame from the same
* stream to be written to the same packet.
*/
last_packet_out = lsquic_send_ctl_last_scheduled(&conn->fc_send_ctl);
if (last_packet_out &&
(last_packet_out->po_frame_types &
((1 << QUIC_FRAME_STREAM)|(1 << QUIC_FRAME_RST_STREAM))))
last_packet_out->po_flags &= ~PO_WRITEABLE;
}
CLOSE_IF_NECESSARY();
service_streams(conn);
RETURN_IF_OUT_OF_PACKETS();
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) ||
0 != lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl) ||
!conn->fc_settings->es_silent_close)
{
generate_connection_close_packet(conn);
return progress_tick | TICK_SEND|TICK_CLOSE;
}
else
return progress_tick | TICK_CLOSE;
}
if (0 == lsquic_send_ctl_n_scheduled(&conn->fc_send_ctl))
{
if (conn->fc_flags & FC_SEND_PING)
{
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
return progress_tick | TICK_QUIET;
}
else if (!(conn->fc_flags & FC_SERVER))
{
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 */
}
now = lsquic_time_now();
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE,
now + conn->fc_settings->es_idle_conn_to);
/* From the spec:
* " The PING frame should be used to keep a connection alive when
* " a stream is open.
*/
if (0 == (conn->fc_flags & FC_SERVER) &&
lsquic_hash_count(conn->fc_streams) > 0)
lsquic_alarmset_set(&conn->fc_alset, AL_PING, now + TIME_BETWEEN_PINGS);
return progress_tick | TICK_SEND;
}
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;
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE,
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 (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
return lsquic_send_ctl_next_packet_to_send(&conn->fc_send_ctl);
}
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;
if (packet_out->po_frame_types & QFRAME_RETRANSMITTABLE_MASK)
{
conn->fc_n_cons_unretx = 0;
lsquic_alarmset_set(&conn->fc_alset, AL_IDLE,
packet_out->po_sent + conn->fc_settings->es_idle_conn_to);
}
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 FULL_CONN_STATS
++conn->fc_stats.n_packets_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_handshake_done (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
LSQ_DEBUG("handshake reportedly done");
lsquic_alarmset_unset(&conn->fc_alset, AL_HANDSHAKE);
if (0 == apply_peer_settings(conn))
lconn->cn_flags |= LSCONN_HANDSHAKE_DONE;
else
conn->fc_flags |= FC_ERROR;
}
static int
full_conn_ci_user_wants_read (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
const lsquic_stream_t *stream;
TAILQ_FOREACH(stream, &conn->fc_pub.rw_streams, next_rw_stream)
if (stream->stream_flags & STREAM_WANT_READ)
return 1;
return 0;
}
void
lsquic_conn_abort (lsquic_conn_t *lconn)
{
struct full_conn *conn = (struct full_conn *) lconn;
LSQ_INFO("User aborted connection");
conn->fc_flags |= FC_ABORTED;
}
void
full_conn_close_internal (lsquic_conn_t *lconn, int is_user)
{
struct full_conn *conn = (struct full_conn *) lconn;
lsquic_stream_t *stream;
struct lsquic_hash_elem *el;
if (!(conn->fc_flags & FC_CLOSING))
{
if (is_user)
LSQ_INFO("User closed connection");
for (el = lsquic_hash_first(conn->fc_streams); el;
el = lsquic_hash_next(conn->fc_streams))
{
stream = lsquic_hashelem_getdata(el);
lsquic_stream_shutdown_internal(stream);
}
conn->fc_flags |= FC_CLOSING;
if (!(conn->fc_flags & FC_GOAWAY_SENT))
conn->fc_flags |= FC_SEND_GOAWAY;
}
}
void
lsquic_conn_close (lsquic_conn_t *lconn)
{
full_conn_close_internal(lconn, 1);
}
void
lsquic_conn_going_away (lsquic_conn_t *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;
}
}
/* Find stream when stream ID is read in from HEADERS stream. If stream
* cannot be found or created, the connection is aborted.
*/
#if __GNUC__
__attribute__((nonnull(3)))
#endif
static lsquic_stream_t *
find_stream_on_headers (struct full_conn *conn, uint32_t stream_id,
const char *what)
{
lsquic_stream_t *stream = find_stream_by_id(conn, stream_id);
if (!stream)
{
if (conn_is_stream_closed(conn, stream_id))
{
LSQ_DEBUG("drop incoming %s for closed stream %u", what, stream_id);
return NULL;
}
if (is_peer_initiated(conn, 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)
{
ABORT_ERROR("incoming %s for stream %u would exceed "
"limit: %u", what, stream_id, conn->fc_cfg.max_streams_in);
return NULL;
}
if ((conn->fc_flags & FC_GOING_AWAY) &&
stream_id > conn->fc_max_peer_stream_id)
{
LSQ_DEBUG("going away: drop headers for new stream %u",
stream_id);
return NULL;
}
}
else
{
ABORT_ERROR("frame for never-initiated stream (push promise?)");
return NULL;
}
stream = new_stream(conn, stream_id);
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, uint32_t stream_id)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream = find_stream_on_headers(conn, stream_id, "error");
if (stream)
{
LSQ_DEBUG("resetting stream %u 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_reset_ext(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 %u", uh->uh_stream_id);
stream = find_stream_on_headers(conn, uh->uh_stream_id, "headers");
if (!stream)
{
free(uh);
return;
}
if (0 != lsquic_stream_uh_in(stream, uh))
{
ABORT_ERROR("stream %u refused incoming headers", uh->uh_stream_id);
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 %u in response to %u",
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: %u, %u",
uh->uh_oth_stream_id, uh->uh_stream_id);
free(uh);
return;
}
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 %u never "
"initiated", uh->uh_stream_id);
free(uh);
return;
}
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 %u already used",
uh->uh_oth_stream_id);
free(uh);
return;
}
stream = new_stream_ext(conn, uh->uh_oth_stream_id, STREAM_IF_STD,
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));
free(uh);
return;
}
lsquic_stream_push_req(stream, uh);
lsquic_stream_call_on_new(stream,
conn->fc_stream_ifs[STREAM_IF_STD].stream_if_ctx);
return;
}
static void
headers_stream_on_priority (void *ctx, uint32_t stream_id, int exclusive,
uint32_t dep_stream_id, unsigned weight)
{
struct full_conn *conn = ctx;
lsquic_stream_t *stream;
LSQ_DEBUG("got priority frame for stream %u: (ex: %d; dep stream: %u; "
"weight: %u)", stream_id, exclusive, dep_stream_id, weight);
stream = find_stream_on_headers(conn, stream_id, "priority");
if (stream)
lsquic_stream_set_priority_internal(stream, weight);
}
int lsquic_conn_is_push_enabled(lsquic_conn_t *c)
{
return ((struct full_conn *)c)->fc_flags & FC_SUPPORT_PUSH;
}
lsquic_conn_ctx_t *
lsquic_conn_get_ctx (const lsquic_conn_t *lconn)
{
struct full_conn *const conn = (struct full_conn *) lconn;
return conn->fc_conn_ctx;
}
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 conn_iface full_conn_iface = {
.ci_destroy = full_conn_ci_destroy,
.ci_handshake_done = full_conn_ci_handshake_done,
.ci_next_packet_to_send = full_conn_ci_next_packet_to_send,
.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_tick = full_conn_ci_tick,
.ci_user_wants_read = full_conn_ci_user_wants_read,
};
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