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- [BUGFIX] Update packetization threshold when writing to stream after packet size is reduced following an RTO.
1997 lines
62 KiB
C
1997 lines
62 KiB
C
/* Copyright (c) 2017 - 2020 LiteSpeed Technologies Inc. See LICENSE. */
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#ifndef __LSQUIC_H__
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#define __LSQUIC_H__
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/**
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* @file
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* public API for using liblsquic is defined in this file.
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*
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*/
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#include <stdarg.h>
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#include <lsquic_types.h>
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#ifndef WIN32
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#include <sys/uio.h>
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#include <time.h>
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#else
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#include <vc_compat.h>
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#endif
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struct sockaddr;
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define LSQUIC_MAJOR_VERSION 2
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#define LSQUIC_MINOR_VERSION 23
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#define LSQUIC_PATCH_VERSION 3
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/**
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* Engine flags:
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*/
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/** Server mode */
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#define LSENG_SERVER (1 << 0)
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/** Use HTTP behavior */
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#define LSENG_HTTP (1 << 1)
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#define LSENG_HTTP_SERVER (LSENG_SERVER|LSENG_HTTP)
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/**
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* This is a list of QUIC versions that we know of. List of supported
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* versions is in LSQUIC_SUPPORTED_VERSIONS.
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*/
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enum lsquic_version
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{
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/**
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* Q043. Support for processing PRIORITY frames. Since this library
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* has supported PRIORITY frames from the beginning, this version is
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* exactly the same as LSQVER_042.
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*/
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LSQVER_043,
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/**
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* Q046. Use IETF Draft-17 compatible packet headers.
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*/
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LSQVER_046,
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/**
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* Q050. Variable-length QUIC server connection IDs. Use CRYPTO frames
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* for handshake. IETF header format matching invariants-06. Packet
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* number encryption. Initial packets are obfuscated.
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*/
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LSQVER_050,
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#if LSQUIC_USE_Q098
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/**
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* Q098. This is a made-up, experimental version used to test version
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* negotiation. The choice of 98 is similar to Google's choice of 99
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* as the "IETF" version.
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*/
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LSQVER_098,
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#define LSQUIC_EXPERIMENTAL_Q098 (1 << LSQVER_098)
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#else
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#define LSQUIC_EXPERIMENTAL_Q098 0
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#endif
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/**
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* IETF QUIC Draft-27
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*/
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LSQVER_ID27,
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/**
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* IETF QUIC Draft-28; this version is deprecated.
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*/
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LSQVER_ID28,
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/**
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* IETF QUIC Draft-29
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*/
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LSQVER_ID29,
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/**
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* IETF QUIC Draft-30
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*/
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LSQVER_ID30,
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/**
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* IETF QUIC Draft-31
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*/
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LSQVER_ID31,
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/**
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* Special version to trigger version negotiation.
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* [draft-ietf-quic-transport-11], Section 3.
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*/
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LSQVER_VERNEG,
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N_LSQVER
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};
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/**
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* We currently support versions 43, 46, 50, Draft-27, Draft-28, Draft-29,
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* Draft-30, and Draft-31.
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* @see lsquic_version
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*/
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#define LSQUIC_SUPPORTED_VERSIONS ((1 << N_LSQVER) - 1)
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/**
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* List of versions in which the server never includes CID in short packets.
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*/
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#define LSQUIC_FORCED_TCID0_VERSIONS ((1 << LSQVER_046)|(1 << LSQVER_050))
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#define LSQUIC_EXPERIMENTAL_VERSIONS ( \
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(1 << LSQVER_VERNEG) | LSQUIC_EXPERIMENTAL_Q098)
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#define LSQUIC_DEPRECATED_VERSIONS ((1 << LSQVER_ID27) | (1 << LSQVER_ID28) \
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| (1 << LSQVER_ID30))
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#define LSQUIC_GQUIC_HEADER_VERSIONS (1 << LSQVER_043)
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#define LSQUIC_IETF_VERSIONS ((1 << LSQVER_ID27) | (1 << LSQVER_ID28) \
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| (1 << LSQVER_ID29) | (1 << LSQVER_ID30) \
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| (1 << LSQVER_ID31) | (1 << LSQVER_VERNEG))
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#define LSQUIC_IETF_DRAFT_VERSIONS ((1 << LSQVER_ID27) | (1 << LSQVER_ID28) \
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| (1 << LSQVER_ID29) | (1 << LSQVER_ID30) \
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| (1 << LSQVER_ID31) | (1 << LSQVER_VERNEG))
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enum lsquic_hsk_status
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{
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/**
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* The handshake failed.
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*/
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LSQ_HSK_FAIL,
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/**
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* The handshake succeeded without session resumption.
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*/
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LSQ_HSK_OK,
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/**
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* The handshake succeeded with session resumption.
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*/
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LSQ_HSK_RESUMED_OK,
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/**
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* Session resumption failed. Retry the connection without session
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* resumption.
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*/
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LSQ_HSK_RESUMED_FAIL,
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};
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/**
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* @struct lsquic_stream_if
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* @brief The definitions of callback functions called by lsquic_stream to
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* process events.
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*
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*/
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struct lsquic_stream_if {
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/**
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* Use @ref lsquic_conn_get_ctx to get back the context. It is
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* OK for this function to return NULL.
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*/
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lsquic_conn_ctx_t *(*on_new_conn)(void *stream_if_ctx,
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lsquic_conn_t *c);
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/** This is called when our side received GOAWAY frame. After this,
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* new streams should not be created. The callback is optional.
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*/
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void (*on_goaway_received)(lsquic_conn_t *c);
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void (*on_conn_closed)(lsquic_conn_t *c);
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/** If you need to initiate a connection, call lsquic_conn_make_stream().
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* This will cause `on_new_stream' callback to be called when appropriate
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* (this operation is delayed when maximum number of outgoing streams is
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* reached).
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*
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* After `on_close' is called, the stream is no longer accessible.
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*/
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lsquic_stream_ctx_t *
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(*on_new_stream)(void *stream_if_ctx, lsquic_stream_t *s);
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void (*on_read) (lsquic_stream_t *s, lsquic_stream_ctx_t *h);
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void (*on_write) (lsquic_stream_t *s, lsquic_stream_ctx_t *h);
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void (*on_close) (lsquic_stream_t *s, lsquic_stream_ctx_t *h);
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/* Called when datagram is ready to be written */
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ssize_t (*on_dg_write)(lsquic_conn_t *c, void *, size_t);
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/* Called when datagram is read from a packet. This callback is required
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* when es_datagrams is true. Take care to process it quickly, as this
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* is called during lsquic_engine_packet_in().
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*/
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void (*on_datagram)(lsquic_conn_t *, const void *buf, size_t);
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/* This callback in only called in client mode */
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/**
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* When handshake is completed, this optional callback is called.
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*/
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void (*on_hsk_done)(lsquic_conn_t *c, enum lsquic_hsk_status s);
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/**
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* When client receives a token in NEW_TOKEN frame, this callback is called.
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* The callback is optional.
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*/
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void (*on_new_token)(lsquic_conn_t *c, const unsigned char *token,
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size_t token_size);
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/**
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* This optional callback lets client record information needed to
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* perform a session resumption next time around.
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*/
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void (*on_sess_resume_info)(lsquic_conn_t *c, const unsigned char *, size_t);
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};
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struct ssl_ctx_st;
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struct ssl_st;
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struct lsxpack_header;
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/**
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* QUIC engine in server mode needs access to certificates. This is
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* accomplished by providing a callback and a context to the engine
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* constructor.
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*/
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/* `sni' may be NULL if engine is not HTTP mode and client TLS transport
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* parameters did not include the SNI.
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*/
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typedef struct ssl_ctx_st * (*lsquic_lookup_cert_f)(
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void *lsquic_cert_lookup_ctx, const struct sockaddr *local, const char *sni);
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/**
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* Minimum flow control window is set to 16 KB for both client and server.
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* This means we can send up to this amount of data before handshake gets
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* completed.
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*/
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#define LSQUIC_MIN_FCW (16 * 1024)
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/* Each LSQUIC_DF_* value corresponds to es_* entry in
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* lsquic_engine_settings below.
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*/
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/**
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* By default, deprecated and experimental versions are not included.
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*/
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#define LSQUIC_DF_VERSIONS (LSQUIC_SUPPORTED_VERSIONS & \
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~LSQUIC_DEPRECATED_VERSIONS & \
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~LSQUIC_EXPERIMENTAL_VERSIONS)
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#define LSQUIC_DF_CFCW_SERVER (3 * 1024 * 1024 / 2)
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#define LSQUIC_DF_CFCW_CLIENT (15 * 1024 * 1024)
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#define LSQUIC_DF_SFCW_SERVER (1 * 1024 * 1024)
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#define LSQUIC_DF_SFCW_CLIENT (6 * 1024 * 1024)
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#define LSQUIC_DF_MAX_STREAMS_IN 100
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/* IQUIC uses different names for these: */
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#define LSQUIC_DF_INIT_MAX_DATA_SERVER LSQUIC_DF_CFCW_SERVER
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#define LSQUIC_DF_INIT_MAX_DATA_CLIENT LSQUIC_DF_CFCW_CLIENT
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_REMOTE_SERVER LSQUIC_DF_SFCW_SERVER
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_LOCAL_SERVER 0
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_REMOTE_CLIENT 0
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_LOCAL_CLIENT LSQUIC_DF_SFCW_CLIENT
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#define LSQUIC_DF_INIT_MAX_STREAMS_BIDI LSQUIC_DF_MAX_STREAMS_IN
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#define LSQUIC_DF_INIT_MAX_STREAMS_UNI_CLIENT 100
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#define LSQUIC_DF_INIT_MAX_STREAMS_UNI_SERVER 3
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/* XXX What's a good value here? */
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_UNI_CLIENT (32 * 1024)
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#define LSQUIC_DF_INIT_MAX_STREAM_DATA_UNI_SERVER (12 * 1024)
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/**
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* Default idle connection time in seconds.
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*/
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#define LSQUIC_DF_IDLE_TIMEOUT 30
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/**
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* Default ping period in seconds.
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*/
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#define LSQUIC_DF_PING_PERIOD 15
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/**
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* Default handshake timeout in microseconds.
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*/
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#define LSQUIC_DF_HANDSHAKE_TO (10 * 1000 * 1000)
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#define LSQUIC_DF_IDLE_CONN_TO (LSQUIC_DF_IDLE_TIMEOUT * 1000 * 1000)
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#define LSQUIC_DF_SILENT_CLOSE 1
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/** Default value of maximum header list size. If set to non-zero value,
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* SETTINGS_MAX_HEADER_LIST_SIZE will be sent to peer after handshake is
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* completed (assuming the peer supports this setting frame type).
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*/
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#define LSQUIC_DF_MAX_HEADER_LIST_SIZE 0
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/** Default value of UAID (user-agent ID). */
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#define LSQUIC_DF_UA "LSQUIC"
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#define LSQUIC_DF_STTL 86400
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#define LSQUIC_DF_MAX_INCHOATE (1 * 1000 * 1000)
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/** Do not use NSTP by default */
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#define LSQUIC_DF_SUPPORT_NSTP 0
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/** TODO: IETF QUIC clients do not support push */
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#define LSQUIC_DF_SUPPORT_PUSH 1
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#define LSQUIC_DF_SUPPORT_TCID0 1
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/** By default, LSQUIC ignores Public Reset packets. */
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#define LSQUIC_DF_HONOR_PRST 0
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/**
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* By default, LSQUIC will not send Public Reset packets in response to
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* packets that specify unknown connections.
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*/
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#define LSQUIC_DF_SEND_PRST 0
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/** By default, infinite loop checks are turned on */
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#define LSQUIC_DF_PROGRESS_CHECK 1000
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/** By default, read/write events are dispatched in a loop */
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#define LSQUIC_DF_RW_ONCE 0
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/** By default, the threshold is not enabled */
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#define LSQUIC_DF_PROC_TIME_THRESH 0
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/** By default, packets are paced */
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#define LSQUIC_DF_PACE_PACKETS 1
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/** Default clock granularity is 1000 microseconds */
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#define LSQUIC_DF_CLOCK_GRANULARITY 1000
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/** The default value is 8 for simplicity */
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#define LSQUIC_DF_SCID_LEN 8
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/** The default value is 60 CIDs per minute */
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#define LSQUIC_DF_SCID_ISS_RATE 60
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#define LSQUIC_DF_QPACK_DEC_MAX_BLOCKED 100
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#define LSQUIC_DF_QPACK_DEC_MAX_SIZE 4096
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#define LSQUIC_DF_QPACK_ENC_MAX_BLOCKED 100
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#define LSQUIC_DF_QPACK_ENC_MAX_SIZE 4096
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/* By default, QPACK experiments are turned off */
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#define LSQUIC_DF_QPACK_EXPERIMENT 0
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/** ECN is disabled by default */
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#define LSQUIC_DF_ECN 0
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/** Allow migration by default */
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#define LSQUIC_DF_ALLOW_MIGRATION 1
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/** Use QL loss bits by default */
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#define LSQUIC_DF_QL_BITS 2
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/** Turn spin bit on by default */
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#define LSQUIC_DF_SPIN 1
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/** Turn off delayed ACKs extension by default */
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#define LSQUIC_DF_DELAYED_ACKS 0
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/** Turn on timestamp extension by default */
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#define LSQUIC_DF_TIMESTAMPS 1
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/* Use Adaptive CC by default */
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#define LSQUIC_DF_CC_ALGO 3
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/* Default value of the CC RTT threshold is 1.5 ms */
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#define LSQUIC_DF_CC_RTT_THRESH 1500
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/** Turn off datagram extension by default */
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#define LSQUIC_DF_DATAGRAMS 0
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/** Assume optimistic NAT by default. */
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#define LSQUIC_DF_OPTIMISTIC_NAT 1
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/** Turn on Extensible HTTP Priorities by default. */
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#define LSQUIC_DF_EXT_HTTP_PRIO 1
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/** By default, incoming packet size is not limited. */
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#define LSQUIC_DF_MAX_UDP_PAYLOAD_SIZE_RX 0
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/**
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* By default, greasing the QUIC bit is enabled (if peer sent
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* the "grease_quic_bit" transport parameter).
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*/
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#define LSQUIC_DF_GREASE_QUIC_BIT 1
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/** By default, DPLPMTUD is enabled */
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#define LSQUIC_DF_DPLPMTUD 1
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/** By default, this value is left up to the engine. */
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#define LSQUIC_DF_BASE_PLPMTU 0
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/** By default, this value is left up to the engine. */
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#define LSQUIC_DF_MAX_PLPMTU 0
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/** By default, drop no-progress connections after 60 seconds on the server */
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#define LSQUIC_DF_NOPROGRESS_TIMEOUT_SERVER 60
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/** By default, do not use no-progress timeout on the client */
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#define LSQUIC_DF_NOPROGRESS_TIMEOUT_CLIENT 0
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/** By default, we use the minimum timer of 1000 milliseconds */
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#define LSQUIC_DF_MTU_PROBE_TIMER 1000
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struct lsquic_engine_settings {
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/**
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* This is a bit mask wherein each bit corresponds to a value in
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* enum lsquic_version. Client starts negotiating with the highest
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* version and goes down. Server supports either of the versions
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* specified here.
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*
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* This setting applies to both Google and IETF QUIC.
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*
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* @see lsquic_version
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*/
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unsigned es_versions;
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/**
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* Initial default CFCW.
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*
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* In server mode, per-connection values may be set lower than
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* this if resources are scarce.
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*
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* Do not set es_cfcw and es_sfcw lower than @ref LSQUIC_MIN_FCW.
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*
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* @see es_max_cfcw
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*/
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unsigned es_cfcw;
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/**
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* Initial default SFCW.
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*
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* In server mode, per-connection values may be set lower than
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* this if resources are scarce.
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*
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* Do not set es_cfcw and es_sfcw lower than @ref LSQUIC_MIN_FCW.
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*
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* @see es_max_sfcw
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*/
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unsigned es_sfcw;
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/**
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* This value is used to specify maximum allowed value CFCW is allowed
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* to reach due to window auto-tuning. By default, this value is zero,
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* which means that CFCW is not allowed to increase from its initial
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* value.
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*
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* This setting is applicable to both gQUIC and IETF QUIC.
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*
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* @see es_cfcw, @see es_init_max_data.
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*/
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unsigned es_max_cfcw;
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/**
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* This value is used to specify the maximum value stream flow control
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* window is allowed to reach due to auto-tuning. By default, this
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* value is zero, meaning that auto-tuning is turned off.
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*
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* This setting is applicable to both gQUIC and IETF QUIC.
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*
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* @see es_sfcw, @see es_init_max_stream_data_bidi_remote,
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* @see es_init_max_stream_data_bidi_local.
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*/
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unsigned es_max_sfcw;
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/** MIDS */
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unsigned es_max_streams_in;
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/**
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* Handshake timeout in microseconds.
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*
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* For client, this can be set to an arbitrary value (zero turns the
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* timeout off).
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*
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* For server, this value is limited to about 16 seconds. Do not set
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* it to zero.
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*/
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unsigned long es_handshake_to;
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/** ICSL in microseconds; GQUIC only */
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unsigned long es_idle_conn_to;
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/**
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* When true, CONNECTION_CLOSE is not sent when connection times out.
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* The server will also not send a reply to client's CONNECTION_CLOSE.
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*
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* Corresponds to SCLS (silent close) gQUIC option.
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*/
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int es_silent_close;
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/**
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* This corresponds to SETTINGS_MAX_HEADER_LIST_SIZE
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* (RFC 7540, Section 6.5.2). 0 means no limit. Defaults
|
|
* to @ref LSQUIC_DF_MAX_HEADER_LIST_SIZE.
|
|
*/
|
|
unsigned es_max_header_list_size;
|
|
|
|
/** UAID -- User-Agent ID. Defaults to @ref LSQUIC_DF_UA. */
|
|
const char *es_ua;
|
|
|
|
/**
|
|
* More parameters for server
|
|
*/
|
|
uint64_t es_sttl; /* SCFG TTL in seconds */
|
|
|
|
uint32_t es_pdmd; /* One fixed value X509 */
|
|
uint32_t es_aead; /* One fixed value AESG */
|
|
uint32_t es_kexs; /* One fixed value C255 */
|
|
|
|
/* Maximum number of incoming connections in inchoate state. This is
|
|
* only applicable in server mode.
|
|
*/
|
|
unsigned es_max_inchoate;
|
|
|
|
/**
|
|
* Setting this value to 0 means that
|
|
*
|
|
* For client:
|
|
* a) we send a SETTINGS frame to indicate that we do not support server
|
|
* push; and
|
|
* b) All incoming pushed streams get reset immediately.
|
|
* (For maximum effect, set es_max_streams_in to 0.)
|
|
*
|
|
* For server:
|
|
* lsquic_conn_push_stream() will return -1.
|
|
*/
|
|
int es_support_push;
|
|
|
|
/**
|
|
* If set to true value, the server will not include connection ID in
|
|
* outgoing packets if client's CHLO specifies TCID=0.
|
|
*
|
|
* For client, this means including TCID=0 into CHLO message. Note that
|
|
* in this case, the engine tracks connections by the
|
|
* (source-addr, dest-addr) tuple, thereby making it necessary to create
|
|
* a socket for each connection.
|
|
*
|
|
* This option has no effect in Q046 and Q050, as the server never includes
|
|
* CIDs in the short packets.
|
|
*
|
|
* This setting is applicable to gQUIC only.
|
|
*
|
|
* The default is @ref LSQUIC_DF_SUPPORT_TCID0.
|
|
*/
|
|
int es_support_tcid0;
|
|
|
|
/**
|
|
* Q037 and higher support "No STOP_WAITING frame" mode. When set, the
|
|
* client will send NSTP option in its Client Hello message and will not
|
|
* sent STOP_WAITING frames, while ignoring incoming STOP_WAITING frames,
|
|
* if any. Note that if the version negotiation happens to downgrade the
|
|
* client below Q037, this mode will *not* be used.
|
|
*
|
|
* This option does not affect the server, as it must support NSTP mode
|
|
* if it was specified by the client.
|
|
*
|
|
* This setting is applicable to gQUIC only.
|
|
*/
|
|
int es_support_nstp;
|
|
|
|
/**
|
|
* If set to true value, the library will drop connections when it
|
|
* receives corresponding Public Reset packet. The default is to
|
|
* ignore these packets.
|
|
*
|
|
* The default is @ref LSQUIC_DF_HONOR_PRST.
|
|
*/
|
|
int es_honor_prst;
|
|
|
|
/**
|
|
* If set to true value, the library will send Public Reset packets
|
|
* in response to incoming packets with unknown Connection IDs.
|
|
* The default is @ref LSQUIC_DF_SEND_PRST.
|
|
*/
|
|
int es_send_prst;
|
|
|
|
/**
|
|
* A non-zero value enables internal checks that identify suspected
|
|
* infinite loops in user @ref on_read and @ref on_write callbacks
|
|
* and break them. An infinite loop may occur if user code keeps
|
|
* on performing the same operation without checking status, e.g.
|
|
* reading from a closed stream etc.
|
|
*
|
|
* The value of this parameter is as follows: should a callback return
|
|
* this number of times in a row without making progress (that is,
|
|
* reading, writing, or changing stream state), loop break will occur.
|
|
*
|
|
* The defaut value is @ref LSQUIC_DF_PROGRESS_CHECK.
|
|
*/
|
|
unsigned es_progress_check;
|
|
|
|
/**
|
|
* A non-zero value make stream dispatch its read-write events once
|
|
* per call.
|
|
*
|
|
* When zero, read and write events are dispatched until the stream
|
|
* is no longer readable or writeable, respectively, or until the
|
|
* user signals unwillingness to read or write using
|
|
* @ref lsquic_stream_wantread() or @ref lsquic_stream_wantwrite()
|
|
* or shuts down the stream.
|
|
*
|
|
* This also applies to the on_dg_write() callback.
|
|
*
|
|
* The default value is @ref LSQUIC_DF_RW_ONCE.
|
|
*/
|
|
int es_rw_once;
|
|
|
|
/**
|
|
* If set, this value specifies the number of microseconds that
|
|
* @ref lsquic_engine_process_conns() and
|
|
* @ref lsquic_engine_send_unsent_packets() are allowed to spend
|
|
* before returning.
|
|
*
|
|
* This is not an exact science and the connections must make
|
|
* progress, so the deadline is checked after all connections get
|
|
* a chance to tick (in the case of @ref lsquic_engine_process_conns())
|
|
* and at least one batch of packets is sent out.
|
|
*
|
|
* When processing function runs out of its time slice, immediate
|
|
* calls to @ref lsquic_engine_has_unsent_packets() return false.
|
|
*
|
|
* The default value is @ref LSQUIC_DF_PROC_TIME_THRESH.
|
|
*/
|
|
unsigned es_proc_time_thresh;
|
|
|
|
/**
|
|
* If set to true, packet pacing is implemented per connection.
|
|
*
|
|
* The default value is @ref LSQUIC_DF_PACE_PACKETS.
|
|
*/
|
|
int es_pace_packets;
|
|
|
|
/**
|
|
* Clock granularity information is used by the pacer. The value
|
|
* is in microseconds; default is @ref LSQUIC_DF_CLOCK_GRANULARITY.
|
|
*/
|
|
unsigned es_clock_granularity;
|
|
|
|
/**
|
|
* Congestion control algorithm to use.
|
|
*
|
|
* 0: Use default (@ref LSQUIC_DF_CC_ALGO)
|
|
* 1: Cubic
|
|
* 2: BBRv1
|
|
* 3: Adaptive (Cubic or BBRv1)
|
|
*/
|
|
unsigned es_cc_algo;
|
|
|
|
/**
|
|
* Congestion controller RTT threshold in microseconds.
|
|
*
|
|
* Adaptive congestion control uses BBRv1 until RTT is determined. At
|
|
* that point a permanent choice of congestion controller is made. If
|
|
* RTT is smaller than or equal to es_cc_rtt_thresh, congestion
|
|
* controller is switched to Cubic; otherwise, BBRv1 is picked.
|
|
*
|
|
* The default value is @ref LSQUIC_DF_CC_RTT_THRESH.
|
|
*/
|
|
unsigned es_cc_rtt_thresh;
|
|
|
|
/**
|
|
* No progress timeout.
|
|
*
|
|
* If connection does not make progress for this number of seconds, the
|
|
* connection is dropped. Here, progress is defined as user streams
|
|
* being written to or read from.
|
|
*
|
|
* If this value is zero, this timeout is disabled.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_NOPROGRESS_TIMEOUT_SERVER in server
|
|
* mode and @ref LSQUIC_DF_NOPROGRESS_TIMEOUT_CLIENT in client mode.
|
|
*/
|
|
unsigned es_noprogress_timeout;
|
|
|
|
/* The following settings are specific to IETF QUIC. */
|
|
/* vvvvvvvvvvv */
|
|
|
|
/**
|
|
* Initial max data.
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Depending on the engine mode, the default value is either
|
|
* @ref LSQUIC_DF_INIT_MAX_DATA_CLIENT or
|
|
* @ref LSQUIC_DF_INIT_MAX_DATA_SERVER.
|
|
*/
|
|
unsigned es_init_max_data;
|
|
|
|
/**
|
|
* Initial maximum amount of stream data allowed to be sent on streams
|
|
* created by remote end (peer).
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Depending on the engine mode, the default value is either
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_REMOTE_CLIENT or
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_REMOTE_SERVER.
|
|
*/
|
|
unsigned es_init_max_stream_data_bidi_remote;
|
|
|
|
/**
|
|
* Initial maximum amount of stream data allowed to be sent on streams
|
|
* created by remote end (peer).
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Depending on the engine mode, the default value is either
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_LOCAL_CLIENT or
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_BIDI_LOCAL_SERVER.
|
|
*/
|
|
unsigned es_init_max_stream_data_bidi_local;
|
|
|
|
/**
|
|
* Initial max stream data for unidirectional streams initiated
|
|
* by remote endpoint.
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Depending on the engine mode, the default value is either
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_UNI_CLIENT or
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_UNI_SERVER.
|
|
*/
|
|
unsigned es_init_max_stream_data_uni;
|
|
|
|
/**
|
|
* Maximum initial number of bidirectional stream.
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_INIT_MAX_STREAMS_BIDI.
|
|
*/
|
|
unsigned es_init_max_streams_bidi;
|
|
|
|
/**
|
|
* Maximum initial number of unidirectional stream.
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_INIT_MAX_STREAMS_UNI_CLIENT or
|
|
* @ref LSQUIC_DF_INIT_MAX_STREAM_DATA_UNI_SERVER.
|
|
*/
|
|
unsigned es_init_max_streams_uni;
|
|
|
|
/**
|
|
* Idle connection timeout.
|
|
*
|
|
* This is a transport parameter.
|
|
*
|
|
* (Note: es_idle_conn_to is not reused because it is in microseconds,
|
|
* which, I now realize, was not a good choice. Since it will be
|
|
* obsoleted some time after the switchover to IETF QUIC, we do not
|
|
* have to keep on using strange units.)
|
|
*
|
|
* Default value is @ref LSQUIC_DF_IDLE_TIMEOUT.
|
|
*
|
|
* Maximum value is 600 seconds.
|
|
*/
|
|
unsigned es_idle_timeout;
|
|
|
|
/**
|
|
* Ping period. If set to non-zero value, the connection will generate and
|
|
* send PING frames in the absence of other activity.
|
|
*
|
|
* By default, the server does not send PINGs and the period is set to zero.
|
|
* The client's defaut value is @ref LSQUIC_DF_PING_PERIOD.
|
|
*/
|
|
unsigned es_ping_period;
|
|
|
|
/**
|
|
* Source Connection ID length. Only applicable to the IETF QUIC
|
|
* versions. Valid values are 0 through 20, inclusive.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_SCID_LEN.
|
|
*/
|
|
unsigned es_scid_len;
|
|
|
|
/**
|
|
* Source Connection ID issuance rate. Only applicable to the IETF QUIC
|
|
* versions. This field is measured in CIDs per minute. Using value 0
|
|
* indicates that there is no rate limit for CID issuance.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_SCID_ISS_RATE.
|
|
*/
|
|
unsigned es_scid_iss_rate;
|
|
|
|
/**
|
|
* Maximum size of the QPACK dynamic table that the QPACK decoder will
|
|
* use.
|
|
*
|
|
* The default is @ref LSQUIC_DF_QPACK_DEC_MAX_SIZE.
|
|
*/
|
|
unsigned es_qpack_dec_max_size;
|
|
|
|
/**
|
|
* Maximum number of blocked streams that the QPACK decoder is willing
|
|
* to tolerate.
|
|
*
|
|
* The default is @ref LSQUIC_DF_QPACK_DEC_MAX_BLOCKED.
|
|
*/
|
|
unsigned es_qpack_dec_max_blocked;
|
|
|
|
/**
|
|
* Maximum size of the dynamic table that the encoder is willing to use.
|
|
* The actual size of the dynamic table will not exceed the minimum of
|
|
* this value and the value advertized by peer.
|
|
*
|
|
* The default is @ref LSQUIC_DF_QPACK_ENC_MAX_SIZE.
|
|
*/
|
|
unsigned es_qpack_enc_max_size;
|
|
|
|
/**
|
|
* Maximum number of blocked streams that the QPACK encoder is willing
|
|
* to risk. The actual number of blocked streams will not exceed the
|
|
* minimum of this value and the value advertized by peer.
|
|
*
|
|
* The default is @ref LSQUIC_DF_QPACK_ENC_MAX_BLOCKED.
|
|
*/
|
|
unsigned es_qpack_enc_max_blocked;
|
|
|
|
/**
|
|
* Enable ECN support.
|
|
*
|
|
* The default is @ref LSQUIC_DF_ECN
|
|
*/
|
|
int es_ecn;
|
|
|
|
/**
|
|
* Allow peer to migrate connection.
|
|
*
|
|
* The default is @ref LSQUIC_DF_ALLOW_MIGRATION
|
|
*/
|
|
int es_allow_migration;
|
|
|
|
/**
|
|
* Use QL loss bits. Allowed values are:
|
|
* 0: Do not use loss bits
|
|
* 1: Allow loss bits
|
|
* 2: Allow and send loss bits
|
|
*
|
|
* Default value is @ref LSQUIC_DF_QL_BITS
|
|
*/
|
|
int es_ql_bits;
|
|
|
|
/**
|
|
* Enable spin bit. Allowed values are 0 and 1.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_SPIN
|
|
*/
|
|
int es_spin;
|
|
|
|
/**
|
|
* Enable delayed ACKs extension. Allowed values are 0 and 1.
|
|
*
|
|
* Warning: this is an experimental feature. Using it will most likely
|
|
* lead to degraded performance.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_DELAYED_ACKS
|
|
*/
|
|
int es_delayed_acks;
|
|
|
|
/**
|
|
* Enable timestamps extension. Allowed values are 0 and 1.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_TIMESTAMPS
|
|
*/
|
|
int es_timestamps;
|
|
|
|
/**
|
|
* Maximum packet size we are willing to receive. This is sent to
|
|
* peer in transport parameters: the library does not enforce this
|
|
* limit for incoming packets.
|
|
*
|
|
* If set to zero, limit is not set.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_MAX_UDP_PAYLOAD_SIZE_RX
|
|
*/
|
|
unsigned short es_max_udp_payload_size_rx;
|
|
|
|
/**
|
|
* Enable the "QUIC bit grease" extension. When set to a true value,
|
|
* lsquic will grease the QUIC bit on the outgoing QUIC packets if
|
|
* the peer sent the "grease_quic_bit" transport parameter.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_GREASE_QUIC_BIT
|
|
*/
|
|
int es_grease_quic_bit;
|
|
|
|
/**
|
|
* If set to true value, enable DPLPMTUD -- Datagram Packetization
|
|
* Layer Path MTU Discovery.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_DPLPMTUD
|
|
*/
|
|
int es_dplpmtud;
|
|
|
|
/**
|
|
* PLPMTU size expected to work for most paths.
|
|
*
|
|
* If set to zero, this value is calculated based on QUIC and IP versions.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_BASE_PLPMTU.
|
|
*/
|
|
unsigned short es_base_plpmtu;
|
|
|
|
/**
|
|
* Largest PLPMTU size the engine will try.
|
|
*
|
|
* If set to zero, picking this value is left to the engine.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_MAX_PLPMTU.
|
|
*/
|
|
unsigned short es_max_plpmtu;
|
|
|
|
/**
|
|
* This value specifies how long the DPLPMTUD probe timer is, in
|
|
* milliseconds. [draft-ietf-tsvwg-datagram-plpmtud-17] says:
|
|
*
|
|
" PROBE_TIMER: The PROBE_TIMER is configured to expire after a period
|
|
" longer than the maximum time to receive an acknowledgment to a
|
|
" probe packet. This value MUST NOT be smaller than 1 second, and
|
|
" SHOULD be larger than 15 seconds. Guidance on selection of the
|
|
" timer value are provided in section 3.1.1 of the UDP Usage
|
|
" Guidelines [RFC8085].
|
|
*
|
|
* If set to zero, the default is used.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_MTU_PROBE_TIMER.
|
|
*/
|
|
unsigned es_mtu_probe_timer;
|
|
|
|
/**
|
|
* Enable datagram extension. Allowed values are 0 and 1.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_DATAGRAMS
|
|
*/
|
|
int es_datagrams;
|
|
|
|
/**
|
|
* If set to true, changes in peer port are assumed to be due to a
|
|
* benign NAT rebinding and path characteristics -- MTU, RTT, and
|
|
* CC state -- are not reset.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_OPTIMISTIC_NAT.
|
|
*/
|
|
int es_optimistic_nat;
|
|
|
|
/**
|
|
* If set to true, Extensible HTTP Priorities are enabled. This
|
|
* is HTTP/3-only setting.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_EXT_HTTP_PRIO
|
|
*/
|
|
int es_ext_http_prio;
|
|
|
|
/**
|
|
* If set to 1, QPACK statistics are logged per connection.
|
|
*
|
|
* If set to 2, QPACK experiments are run. In this mode, encoder
|
|
* and decoder setting values are randomly selected (from the range
|
|
* [0, whatever is specified in es_qpack_(enc|dec)_*]) and these
|
|
* values along with compression ratio and user agent are logged at
|
|
* NOTICE level when connection is destroyed. The purpose of these
|
|
* experiments is to use compression performance statistics to figure
|
|
* out a good set of default values.
|
|
*
|
|
* Default value is @ref LSQUIC_DF_QPACK_EXPERIMENT.
|
|
*/
|
|
int es_qpack_experiment;
|
|
};
|
|
|
|
/* Initialize `settings' to default values */
|
|
void
|
|
lsquic_engine_init_settings (struct lsquic_engine_settings *,
|
|
unsigned lsquic_engine_flags);
|
|
|
|
/**
|
|
* Check settings for errors.
|
|
*
|
|
* @param settings Settings struct.
|
|
*
|
|
* @param flags Engine flags.
|
|
*
|
|
* @param err_buf Optional pointer to buffer into which error string
|
|
* is written.
|
|
|
|
* @param err_buf_sz Size of err_buf. No more than this number of bytes
|
|
* will be written to err_buf, including the NUL byte.
|
|
*
|
|
* @retval 0 Settings have no errors.
|
|
* @retval -1 There are errors in settings.
|
|
*/
|
|
int
|
|
lsquic_engine_check_settings (const struct lsquic_engine_settings *settings,
|
|
unsigned lsquic_engine_flags,
|
|
char *err_buf, size_t err_buf_sz);
|
|
|
|
struct lsquic_out_spec
|
|
{
|
|
struct iovec *iov;
|
|
size_t iovlen;
|
|
const struct sockaddr *local_sa;
|
|
const struct sockaddr *dest_sa;
|
|
void *peer_ctx;
|
|
lsquic_conn_ctx_t *conn_ctx; /* will be NULL when sending out the first batch of handshake packets */
|
|
int ecn; /* Valid values are 0 - 3. See RFC 3168 */
|
|
};
|
|
|
|
/**
|
|
* Returns number of packets successfully sent out or -1 on error. -1 should
|
|
* only be returned if no packets were sent out. If -1 is returned or if the
|
|
* return value is smaller than `n_packets_out', this indicates that sending
|
|
* of packets is not possible.
|
|
*
|
|
* If not all packets could be sent out, errno is examined. If it is not
|
|
* EAGAIN or EWOULDBLOCK, the connection whose packet cause the error is
|
|
* closed forthwith.
|
|
*
|
|
* No packets will be attempted to be sent out until
|
|
* @ref lsquic_engine_send_unsent_packets() is called.
|
|
*/
|
|
typedef int (*lsquic_packets_out_f)(
|
|
void *packets_out_ctx,
|
|
const struct lsquic_out_spec *out_spec,
|
|
unsigned n_packets_out
|
|
);
|
|
|
|
/**
|
|
* The shared hash interface is used to share data between multiple LSQUIC
|
|
* instances.
|
|
*/
|
|
struct lsquic_shared_hash_if
|
|
{
|
|
/**
|
|
* If you want your item to never expire, set `expiry' to zero.
|
|
* Returns 0 on success, -1 on failure.
|
|
*
|
|
* If inserted successfully, `free()' will be called on `data' and 'key'
|
|
* pointer when the element is deleted, whether due to expiration
|
|
* or explicit deletion.
|
|
*/
|
|
int (*shi_insert)(void *shi_ctx, void *key, unsigned key_sz,
|
|
void *data, unsigned data_sz, time_t expiry);
|
|
/**
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
int (*shi_delete)(void *shi_ctx, const void *key, unsigned key_sz);
|
|
|
|
/**
|
|
* `data' is pointed to the result and `data_sz' is set to the
|
|
* object size. The implementation may choose to copy the object
|
|
* into buffer pointed to by `data', so you should have it ready.
|
|
*
|
|
* @retval 1 found.
|
|
* @retval 0 not found.
|
|
* @retval -1 error (perhaps not enough room in `data' if copy was
|
|
* attempted).
|
|
*/
|
|
int (*shi_lookup)(void *shi_ctx, const void *key, unsigned key_sz,
|
|
void **data, unsigned *data_sz);
|
|
};
|
|
|
|
/**
|
|
* The packet out memory interface is used by LSQUIC to get buffers to
|
|
* which outgoing packets will be written before they are passed to
|
|
* ea_packets_out callback.
|
|
*
|
|
* If not specified, malloc() and free() are used.
|
|
*/
|
|
struct lsquic_packout_mem_if
|
|
{
|
|
/**
|
|
* Allocate buffer for sending.
|
|
*/
|
|
void * (*pmi_allocate) (void *pmi_ctx, void *peer_ctx, lsquic_conn_ctx_t *, unsigned short sz,
|
|
char is_ipv6);
|
|
/**
|
|
* This function is used to release the allocated buffer after it is
|
|
* sent via @ref ea_packets_out.
|
|
*/
|
|
void (*pmi_release) (void *pmi_ctx, void *peer_ctx, void *buf,
|
|
char is_ipv6);
|
|
/**
|
|
* If allocated buffer is not going to be sent, return it to the caller
|
|
* using this function.
|
|
*/
|
|
void (*pmi_return) (void *pmi_ctx, void *peer_ctx, void *buf,
|
|
char is_ipv6);
|
|
};
|
|
|
|
typedef void (*lsquic_cids_update_f)(void *ctx, void **peer_ctx,
|
|
const lsquic_cid_t *cids, unsigned n_cids);
|
|
|
|
struct stack_st_X509;
|
|
|
|
enum lsquic_hsi_flag {
|
|
/**
|
|
* Turn HTTP/1.x mode on or off. In this mode, decoded name and value
|
|
* pair are separated by ": " and "\r\n" is appended to the end of the
|
|
* string. By default, this mode is off.
|
|
*/
|
|
LSQUIC_HSI_HTTP1X = 1 << 1,
|
|
/** Include name hash into lsxpack_header */
|
|
LSQUIC_HSI_HASH_NAME = 1 << 2,
|
|
/** Include nameval hash into lsxpack_header */
|
|
LSQUIC_HSI_HASH_NAMEVAL = 1 << 3,
|
|
};
|
|
|
|
struct lsquic_hset_if
|
|
{
|
|
/**
|
|
* Create a new header set. This object is (and must be) fetched from a
|
|
* stream by calling @ref lsquic_stream_get_hset() before the stream can
|
|
* be read.
|
|
*
|
|
* `stream' may be set to NULL in server mode.
|
|
*/
|
|
void * (*hsi_create_header_set)(void *hsi_ctx, lsquic_stream_t *stream,
|
|
int is_push_promise);
|
|
/**
|
|
* Return a header set prepared for decoding. If `hdr' is NULL, this
|
|
* means return a new structure with at least `space' bytes available
|
|
* in the decoder buffer. On success, a newly prepared header is
|
|
* returned.
|
|
*
|
|
* If `hdr' is not NULL, it means there was not enough decoder buffer
|
|
* and it must be increased to at least `space' bytes. `buf', `val_len',
|
|
* and `name_offset' member of the `hdr' structure may change. On
|
|
* success, the return value is the same as `hdr'.
|
|
*
|
|
* If NULL is returned, the space cannot be allocated.
|
|
*/
|
|
struct lsxpack_header *
|
|
(*hsi_prepare_decode)(void *hdr_set,
|
|
struct lsxpack_header *hdr,
|
|
size_t space);
|
|
/**
|
|
* Process new header. Return 0 on success, a positive value if a header
|
|
* error occured, or a negative value on any other error.
|
|
*
|
|
* A positive return value will result in cancellation of associated
|
|
* stream.
|
|
*
|
|
* A negative return value will result in connection being aborted.
|
|
*
|
|
* `hdr_set' is the header set object returned by
|
|
* @ref hsi_create_header_set().
|
|
*
|
|
* `hdr' is the header returned by @ref `hsi_prepare_decode'.
|
|
*
|
|
* If `hdr' is NULL, this means that no more header are going to be
|
|
* added to the set.
|
|
*/
|
|
int (*hsi_process_header)(void *hdr_set, struct lsxpack_header *hdr);
|
|
/**
|
|
* Discard header set. This is called for unclaimed header sets and
|
|
* header sets that had an error.
|
|
*/
|
|
void (*hsi_discard_header_set)(void *hdr_set);
|
|
/**
|
|
* These flags specify properties of decoded headers passed to
|
|
* hsi_process_header(). This is only applicable to QPACK headers;
|
|
* HPACK library header properties are based on compilation, not
|
|
* run-time, options.
|
|
*/
|
|
enum lsquic_hsi_flag hsi_flags;
|
|
};
|
|
|
|
/**
|
|
* SSL keylog interface.
|
|
*/
|
|
struct lsquic_keylog_if
|
|
{
|
|
/** Return keylog handle or NULL if no key logging is desired */
|
|
void * (*kli_open) (void *keylog_ctx, lsquic_conn_t *);
|
|
|
|
/**
|
|
* Log line. The first argument is the pointer returned by
|
|
* @ref kli_open.
|
|
*/
|
|
void (*kli_log_line) (void *handle, const char *line);
|
|
|
|
/**
|
|
* Close handle.
|
|
*/
|
|
void (*kli_close) (void *handle);
|
|
};
|
|
|
|
/**
|
|
* This struct contains a list of all callbacks that are used by the engine
|
|
* to communicate with the user code. Most of these are optional, while
|
|
* the following are mandatory:
|
|
*
|
|
* @ref ea_stream_if The stream interface.
|
|
* @ref ea_packets_out Function to send packets.
|
|
* @ref ea_lookup_cert Function to look up certificates by SNI (used
|
|
* in server mode).
|
|
*
|
|
* A pointer to this structure is passed to engine constructor
|
|
* @ref lsquic_engine_new().
|
|
*/
|
|
struct lsquic_engine_api
|
|
{
|
|
const struct lsquic_engine_settings *ea_settings; /* Optional */
|
|
/** Stream interface is required to manage connections and streams. */
|
|
const struct lsquic_stream_if *ea_stream_if;
|
|
void *ea_stream_if_ctx;
|
|
/** Function to send packets out is required. */
|
|
lsquic_packets_out_f ea_packets_out;
|
|
void *ea_packets_out_ctx;
|
|
/** Function to look up certificates by SNI is used in server mode. */
|
|
lsquic_lookup_cert_f ea_lookup_cert;
|
|
void *ea_cert_lu_ctx;
|
|
struct ssl_ctx_st * (*ea_get_ssl_ctx)(void *peer_ctx);
|
|
/**
|
|
* Shared hash interface is optional. If set to zero, performance of
|
|
* multiple LSQUIC instances will be degraded.
|
|
*/
|
|
const struct lsquic_shared_hash_if *ea_shi;
|
|
void *ea_shi_ctx;
|
|
/**
|
|
* Memory interface is optional.
|
|
*/
|
|
const struct lsquic_packout_mem_if *ea_pmi;
|
|
void *ea_pmi_ctx;
|
|
/**
|
|
* Optional interface to report new and old source connection IDs.
|
|
*/
|
|
lsquic_cids_update_f ea_new_scids;
|
|
lsquic_cids_update_f ea_live_scids;
|
|
lsquic_cids_update_f ea_old_scids;
|
|
void *ea_cids_update_ctx;
|
|
/**
|
|
* Function to verify server certificate. The chain contains at least
|
|
* one element. The first element in the chain is the server
|
|
* certificate. The chain belongs to the library. If you want to
|
|
* retain it, call sk_X509_up_ref().
|
|
*
|
|
* 0 is returned on success, -1 on error.
|
|
*
|
|
* If the function pointer is not set, no verification is performed
|
|
* (the connection is allowed to proceed).
|
|
*/
|
|
int (*ea_verify_cert)(void *verify_ctx,
|
|
struct stack_st_X509 *chain);
|
|
void *ea_verify_ctx;
|
|
|
|
/**
|
|
* Optional header set interface. If not specified, the incoming headers
|
|
* are converted to HTTP/1.x format and are read from stream and have to
|
|
* be parsed again.
|
|
*/
|
|
const struct lsquic_hset_if *ea_hsi_if;
|
|
void *ea_hsi_ctx;
|
|
#if LSQUIC_CONN_STATS
|
|
/**
|
|
* If set, engine will print cumulative connection statistics to this
|
|
* file just before it is destroyed.
|
|
*/
|
|
void /* FILE, really */ *ea_stats_fh;
|
|
#endif
|
|
|
|
/**
|
|
* Optional SSL key logging interface.
|
|
*/
|
|
const struct lsquic_keylog_if *ea_keylog_if;
|
|
void *ea_keylog_ctx;
|
|
|
|
/**
|
|
* The optional ALPN string is used by the client if @ref LSENG_HTTP
|
|
* is not set.
|
|
*/
|
|
const char *ea_alpn;
|
|
|
|
/**
|
|
* Optional interface to control the creation of connection IDs
|
|
*/
|
|
void (*ea_generate_scid)(lsquic_conn_t *,
|
|
lsquic_cid_t *, unsigned);
|
|
};
|
|
|
|
/**
|
|
* Create new engine.
|
|
*
|
|
* @param lsquic_engine_flags A bitmask of @ref LSENG_SERVER and
|
|
* @ref LSENG_HTTP
|
|
*
|
|
* @param api Required parameter that specifies
|
|
* various callbacks.
|
|
*
|
|
* The engine can be instantiated either in server mode (when LSENG_SERVER
|
|
* is set) or client mode. If you need both server and client in your
|
|
* program, create two engines (or as many as you'd like).
|
|
*/
|
|
lsquic_engine_t *
|
|
lsquic_engine_new (unsigned lsquic_engine_flags,
|
|
const struct lsquic_engine_api *api);
|
|
|
|
/**
|
|
* Create a client connection to peer identified by `peer_ctx'.
|
|
*
|
|
* To let the engine specify QUIC version, use N_LSQVER. If session resumption
|
|
* information is supplied, version is picked from there instead.
|
|
*
|
|
* If `base_plpmtu' is set to zero, it is selected based on the
|
|
* engine settings, QUIC version, and IP version.
|
|
*/
|
|
lsquic_conn_t *
|
|
lsquic_engine_connect (lsquic_engine_t *, enum lsquic_version,
|
|
const struct sockaddr *local_sa,
|
|
const struct sockaddr *peer_sa,
|
|
void *peer_ctx, lsquic_conn_ctx_t *conn_ctx,
|
|
const char *hostname, unsigned short base_plpmtu,
|
|
const unsigned char *sess_resume, size_t sess_resume_len,
|
|
/** Resumption token: optional */
|
|
const unsigned char *token, size_t token_sz);
|
|
|
|
/**
|
|
* Pass incoming packet to the QUIC engine. This function can be called
|
|
* more than once in a row. After you add one or more packets, call
|
|
* lsquic_engine_process_conns() to schedule output, if any.
|
|
*
|
|
* @retval 0 Packet was processed by a real connection.
|
|
*
|
|
* @retval 1 Packet was handled successfully, but not by a connection.
|
|
* This may happen with version negotiation and public reset
|
|
* packets as well as some packets that may be ignored.
|
|
*
|
|
* @retval -1 An error occurred. Possible reasons are failure to allocate
|
|
* memory and invalid @param sa_local in client mode.
|
|
*/
|
|
int
|
|
lsquic_engine_packet_in (lsquic_engine_t *,
|
|
const unsigned char *packet_in_data, size_t packet_in_size,
|
|
const struct sockaddr *sa_local, const struct sockaddr *sa_peer,
|
|
void *peer_ctx, int ecn);
|
|
|
|
/**
|
|
* Process tickable connections. This function must be called often enough so
|
|
* that packets and connections do not expire.
|
|
*/
|
|
void
|
|
lsquic_engine_process_conns (lsquic_engine_t *engine);
|
|
|
|
/**
|
|
* Returns true if engine has some unsent packets. This happens if
|
|
* @ref ea_packets_out() could not send everything out or if processing
|
|
* deadline was exceeded (see @ref es_proc_time_thresh).
|
|
*/
|
|
int
|
|
lsquic_engine_has_unsent_packets (lsquic_engine_t *engine);
|
|
|
|
/**
|
|
* Send out as many unsent packets as possibe: until we are out of unsent
|
|
* packets or until @ref ea_packets_out() fails.
|
|
*
|
|
* If @ref ea_packets_out() does fail cannot send all packets, this
|
|
* function must be called to signify that sending of packets is possible
|
|
* again.
|
|
*/
|
|
void
|
|
lsquic_engine_send_unsent_packets (lsquic_engine_t *engine);
|
|
|
|
/**
|
|
* Destroy engine and all connections and streams in it and free all
|
|
* memory associated with this engine.
|
|
*/
|
|
void
|
|
lsquic_engine_destroy (lsquic_engine_t *);
|
|
|
|
/** Return max allowed outbound streams less current outbound streams. */
|
|
unsigned
|
|
lsquic_conn_n_avail_streams (const lsquic_conn_t *);
|
|
|
|
/**
|
|
* Create a new request stream. This causes @ref on_new_stream() callback
|
|
* to be called. If creating more requests is not permitted at the moment
|
|
* (due to number of concurrent streams limit), stream creation is registered
|
|
* as "pending" and the stream is created later when number of streams dips
|
|
* under the limit again. Any number of pending streams can be created.
|
|
* Use @ref lsquic_conn_n_pending_streams() and
|
|
* @ref lsquic_conn_cancel_pending_streams() to manage pending streams.
|
|
*
|
|
* If connection is going away, @ref on_new_stream() is called with the
|
|
* stream parameter set to NULL.
|
|
*/
|
|
void
|
|
lsquic_conn_make_stream (lsquic_conn_t *);
|
|
|
|
/** Return number of delayed streams currently pending */
|
|
unsigned
|
|
lsquic_conn_n_pending_streams (const lsquic_conn_t *);
|
|
|
|
/** Cancel `n' pending streams. Returns new number of pending streams. */
|
|
unsigned
|
|
lsquic_conn_cancel_pending_streams (lsquic_conn_t *, unsigned n);
|
|
|
|
/**
|
|
* Mark connection as going away: send GOAWAY frame and do not accept
|
|
* any more incoming streams, nor generate streams of our own.
|
|
*
|
|
* Only applicable to HTTP/3 and GQUIC connections. Otherwise a no-op.
|
|
*/
|
|
void
|
|
lsquic_conn_going_away (lsquic_conn_t *);
|
|
|
|
/**
|
|
* This forces connection close. on_conn_closed and on_close callbacks
|
|
* will be called.
|
|
*/
|
|
void
|
|
lsquic_conn_close (lsquic_conn_t *);
|
|
|
|
/**
|
|
* Set whether you want to read from stream. If @param is_want is true,
|
|
* @ref on_read() will be called when there is readable data in the
|
|
* stream. If @param is false, @ref on_read() will not be called.
|
|
*
|
|
* Returns previous value of this flag.
|
|
*/
|
|
int
|
|
lsquic_stream_wantread (lsquic_stream_t *s, int is_want);
|
|
|
|
/**
|
|
* Read up to @param len bytes from stream into @param buf. Returns number
|
|
* of bytes read or -1 on error, in which case errno is set. Possible
|
|
* errno values:
|
|
*
|
|
* EBADF The stream is closed.
|
|
* ECONNRESET The stream has been reset.
|
|
* EWOULDBLOCK There is no data to be read.
|
|
*
|
|
* Return value of zero indicates EOF.
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_read (lsquic_stream_t *s, void *buf, size_t len);
|
|
|
|
/**
|
|
* Similar to @ref lsquic_stream_read(), but reads data into @param vec.
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_readv (lsquic_stream_t *s, const struct iovec *vec, int iovcnt);
|
|
|
|
/**
|
|
* This function allows user-supplied callback to read the stream contents.
|
|
* It is meant to be used for zero-copy stream processing.
|
|
*
|
|
* Return value and errors are same as in @ref lsquic_stream_read().
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_readf (lsquic_stream_t *s,
|
|
/**
|
|
* The callback takes four parameters:
|
|
* - Pointer to user-supplied context;
|
|
* - Pointer to the data;
|
|
* - Data size (can be zero); and
|
|
* - Indicator whether the FIN follows the data.
|
|
*
|
|
* The callback returns number of bytes processed. If this number is zero
|
|
* or is smaller than `len', reading from stream stops.
|
|
*/
|
|
size_t (*readf)(void *ctx, const unsigned char *buf, size_t len, int fin),
|
|
void *ctx);
|
|
|
|
/**
|
|
* Set whether you want to write to stream. If @param is_want is true,
|
|
* @ref on_write() will be called when it is possible to write data to
|
|
* the stream. If @param is false, @ref on_write() will not be called.
|
|
*
|
|
* Returns previous value of this flag.
|
|
*/
|
|
int
|
|
lsquic_stream_wantwrite (lsquic_stream_t *s, int is_want);
|
|
|
|
/**
|
|
* Write `len' bytes to the stream. Returns number of bytes written, which
|
|
* may be smaller that `len'.
|
|
*
|
|
* A negative return value indicates a serious error (the library is likely
|
|
* to have aborted the connection because of it).
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_write (lsquic_stream_t *s, const void *buf, size_t len);
|
|
|
|
/**
|
|
* Like @ref lsquic_stream_write(), but read data from @param vec.
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_writev (lsquic_stream_t *s, const struct iovec *vec, int count);
|
|
|
|
/**
|
|
* Write to streams using a single call to a preadv-like function.
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_pwritev (lsquic_stream_t *s,
|
|
ssize_t (*preadv)(void *user_data, const struct iovec *iov, int iovcnt),
|
|
void *user_data, size_t n_to_write);
|
|
|
|
/**
|
|
* Used as argument to @ref lsquic_stream_writef()
|
|
*/
|
|
struct lsquic_reader
|
|
{
|
|
/**
|
|
* Not a ssize_t because the read function is not supposed to return
|
|
* an error. If an error occurs in the read function (for example, when
|
|
* reading from a file fails), it is supposed to deal with the error
|
|
* itself.
|
|
*/
|
|
size_t (*lsqr_read) (void *lsqr_ctx, void *buf, size_t count);
|
|
/**
|
|
* Return number of bytes remaining in the reader.
|
|
*/
|
|
size_t (*lsqr_size) (void *lsqr_ctx);
|
|
void *lsqr_ctx;
|
|
};
|
|
|
|
/**
|
|
* Write to stream using @ref lsquic_reader. This is the most generic of
|
|
* the write functions -- @ref lsquic_stream_write() and
|
|
* @ref lsquic_stream_writev() utilize the same mechanism.
|
|
*
|
|
* @retval Number of bytes written or -1 on error.
|
|
*/
|
|
ssize_t
|
|
lsquic_stream_writef (lsquic_stream_t *, struct lsquic_reader *);
|
|
|
|
/**
|
|
* Flush any buffered data. This triggers packetizing even a single byte
|
|
* into a separate frame. Flushing a closed stream is an error.
|
|
*
|
|
* @retval 0 Success
|
|
* @retval -1 Failure
|
|
*/
|
|
int
|
|
lsquic_stream_flush (lsquic_stream_t *s);
|
|
|
|
/**
|
|
* @typedef lsquic_http_headers_t
|
|
* @brief HTTP header list structure. Contains a list of HTTP headers in key/value pairs.
|
|
* used in API functions to pass headers.
|
|
*/
|
|
struct lsquic_http_headers
|
|
{
|
|
int count;
|
|
struct lsxpack_header *headers;
|
|
};
|
|
|
|
/**
|
|
* Send headers in @param headers. This function must be called before
|
|
* writing to the stream. The value of @param eos is ignored in IETF QUIC.
|
|
*/
|
|
int
|
|
lsquic_stream_send_headers (lsquic_stream_t *s,
|
|
const lsquic_http_headers_t *headers, int eos);
|
|
|
|
/**
|
|
* Get header set associated with the stream. The header set is created by
|
|
* @ref hsi_create_header_set() callback. After this call, the ownership of
|
|
* the header set is transferred to the caller.
|
|
*
|
|
* This call must precede calls to @ref lsquic_stream_read() and
|
|
* @ref lsquic_stream_readv().
|
|
*
|
|
* If the optional header set interface (@ref ea_hsi_if) is not specified,
|
|
* this function returns NULL.
|
|
*/
|
|
void *
|
|
lsquic_stream_get_hset (lsquic_stream_t *);
|
|
|
|
/**
|
|
* A server may push a stream. This call creates a new stream in reference
|
|
* to stream `s'. It will behave as if the client made a request: it will
|
|
* trigger on_new_stream() event and it can be used as a regular client-
|
|
* initiated stream.
|
|
*
|
|
* `hdr_set' must be set. It is passed as-is to @lsquic_stream_get_hset.
|
|
*
|
|
* @retval 0 Stream pushed successfully.
|
|
* @retval 1 Stream push failed because it is disabled or because we hit
|
|
* stream limit or connection is going away.
|
|
* @retval -1 Stream push failed because of an internal error.
|
|
*/
|
|
int
|
|
lsquic_conn_push_stream (lsquic_conn_t *c, void *hdr_set, lsquic_stream_t *s,
|
|
const lsquic_http_headers_t *headers);
|
|
|
|
/**
|
|
* Only makes sense in server mode: the client cannot push a stream and this
|
|
* function always returns false in client mode.
|
|
*/
|
|
int
|
|
lsquic_conn_is_push_enabled (lsquic_conn_t *);
|
|
|
|
/** Possible values for how are 0, 1, and 2. See shutdown(2). */
|
|
int lsquic_stream_shutdown(lsquic_stream_t *s, int how);
|
|
|
|
int lsquic_stream_close(lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Get certificate chain returned by the server. This can be used for
|
|
* server certificate verification.
|
|
*
|
|
* The caller releases the stack using sk_X509_free().
|
|
*/
|
|
struct stack_st_X509 *
|
|
lsquic_conn_get_server_cert_chain (lsquic_conn_t *);
|
|
|
|
/** Returns ID of the stream */
|
|
lsquic_stream_id_t
|
|
lsquic_stream_id (const lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Returns stream ctx associated with the stream. (The context is what
|
|
* is returned by @ref on_new_stream callback).
|
|
*/
|
|
lsquic_stream_ctx_t *
|
|
lsquic_stream_get_ctx (const lsquic_stream_t *s);
|
|
|
|
/** Returns true if this is a pushed stream */
|
|
int
|
|
lsquic_stream_is_pushed (const lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Returns true if this stream was rejected, false otherwise. Use this as
|
|
* an aid to distinguish between errors.
|
|
*/
|
|
int
|
|
lsquic_stream_is_rejected (const lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Refuse pushed stream. Call it from @ref on_new_stream.
|
|
*
|
|
* No need to call lsquic_stream_close() after this. on_close will be called.
|
|
*
|
|
* @see lsquic_stream_is_pushed
|
|
*/
|
|
int
|
|
lsquic_stream_refuse_push (lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Get information associated with pushed stream:
|
|
*
|
|
* @param ref_stream_id Stream ID in response to which push promise was
|
|
* sent.
|
|
* @param hdr_set Header set. This object was passed to or generated
|
|
* by @ref lsquic_conn_push_stream().
|
|
*
|
|
* @retval 0 Success.
|
|
* @retval -1 This is not a pushed stream.
|
|
*/
|
|
int
|
|
lsquic_stream_push_info (const lsquic_stream_t *,
|
|
lsquic_stream_id_t *ref_stream_id, void **hdr_set);
|
|
|
|
/** Return current priority of the stream */
|
|
unsigned lsquic_stream_priority (const lsquic_stream_t *s);
|
|
|
|
/**
|
|
* Set stream priority. Valid priority values are 1 through 256, inclusive.
|
|
* Lower value means higher priority.
|
|
*
|
|
* @retval 0 Success.
|
|
* @retval -1 Priority value is invalid.
|
|
*/
|
|
int lsquic_stream_set_priority (lsquic_stream_t *s, unsigned priority);
|
|
|
|
/*
|
|
* Definitions for Extensible HTTP Priorities:
|
|
* https://tools.ietf.org/html/draft-ietf-httpbis-priority-01
|
|
*/
|
|
/* This is maximum *value* -- but it's the lowest *priority* */
|
|
#define LSQUIC_MAX_HTTP_URGENCY 7
|
|
#define LSQUIC_DEF_HTTP_URGENCY 3
|
|
#define LSQUIC_DEF_HTTP_INCREMENTAL 0
|
|
|
|
struct lsquic_ext_http_prio
|
|
{
|
|
unsigned char urgency;
|
|
signed char incremental;
|
|
};
|
|
|
|
/**
|
|
* Get Extensible HTTP Priorities associated with the stream.
|
|
*
|
|
* Returns zero on success of a negative value on failure. A failure occurs
|
|
* if this is not an HTTP/3 stream or if Extensible HTTP Priorities haven't
|
|
* been enabled. See @ref es_ext_http_prio.
|
|
*/
|
|
int
|
|
lsquic_stream_get_http_prio (lsquic_stream_t *, struct lsquic_ext_http_prio *);
|
|
|
|
/**
|
|
* Set Extensible HTTP Priorities of the stream.
|
|
*
|
|
* Returns zero on success of a negative value on failure. A failure occurs
|
|
* if some internal error occured or if this is not an HTTP/3 stream or if
|
|
* Extensible HTTP Priorities haven't been enabled. See @ref es_ext_http_prio.
|
|
*/
|
|
int
|
|
lsquic_stream_set_http_prio (lsquic_stream_t *,
|
|
const struct lsquic_ext_http_prio *);
|
|
|
|
/**
|
|
* Get a pointer to the connection object. Use it with lsquic_conn_*
|
|
* functions.
|
|
*/
|
|
lsquic_conn_t * lsquic_stream_conn(const lsquic_stream_t *s);
|
|
|
|
/** Get connection ID */
|
|
const lsquic_cid_t *
|
|
lsquic_conn_id (const lsquic_conn_t *c);
|
|
|
|
/** Get pointer to the engine */
|
|
lsquic_engine_t *
|
|
lsquic_conn_get_engine (lsquic_conn_t *c);
|
|
|
|
int
|
|
lsquic_conn_get_sockaddr(lsquic_conn_t *c,
|
|
const struct sockaddr **local, const struct sockaddr **peer);
|
|
|
|
/* Returns previous value */
|
|
int
|
|
lsquic_conn_want_datagram_write (lsquic_conn_t *, int is_want);
|
|
|
|
/* Get minimum datagram size. By default, this value is zero. */
|
|
size_t
|
|
lsquic_conn_get_min_datagram_size (lsquic_conn_t *);
|
|
|
|
/* Set minimum datagram size. This is the minumum value of the buffer passed
|
|
* to the on_dg_write() callback.
|
|
*/
|
|
int
|
|
lsquic_conn_set_min_datagram_size (lsquic_conn_t *, size_t sz);
|
|
|
|
struct lsquic_logger_if {
|
|
int (*log_buf)(void *logger_ctx, const char *buf, size_t len);
|
|
};
|
|
|
|
/**
|
|
* Enumerate timestamp styles supported by LSQUIC logger mechanism.
|
|
*/
|
|
enum lsquic_logger_timestamp_style {
|
|
/**
|
|
* No timestamp is generated.
|
|
*/
|
|
LLTS_NONE,
|
|
|
|
/**
|
|
* The timestamp consists of 24 hours, minutes, seconds, and
|
|
* milliseconds. Example: 13:43:46.671
|
|
*/
|
|
LLTS_HHMMSSMS,
|
|
|
|
/**
|
|
* Like above, plus date, e.g: 2017-03-21 13:43:46.671
|
|
*/
|
|
LLTS_YYYYMMDD_HHMMSSMS,
|
|
|
|
/**
|
|
* This is Chrome-like timestamp used by proto-quic. The timestamp
|
|
* includes month, date, hours, minutes, seconds, and microseconds.
|
|
*
|
|
* Example: 1223/104613.946956 (instead of 12/23 10:46:13.946956).
|
|
*
|
|
* This is to facilitate reading two logs side-by-side.
|
|
*/
|
|
LLTS_CHROMELIKE,
|
|
|
|
/**
|
|
* The timestamp consists of 24 hours, minutes, seconds, and
|
|
* microseconds. Example: 13:43:46.671123
|
|
*/
|
|
LLTS_HHMMSSUS,
|
|
|
|
/**
|
|
* Date and time using microsecond resolution,
|
|
* e.g: 2017-03-21 13:43:46.671123
|
|
*/
|
|
LLTS_YYYYMMDD_HHMMSSUS,
|
|
|
|
N_LLTS
|
|
};
|
|
|
|
/**
|
|
* Call this if you want to do something with LSQUIC log messages, as they
|
|
* are thrown out by default.
|
|
*/
|
|
void lsquic_logger_init(const struct lsquic_logger_if *, void *logger_ctx,
|
|
enum lsquic_logger_timestamp_style);
|
|
|
|
/**
|
|
* Set log level for all LSQUIC modules. Acceptable values are debug, info,
|
|
* notice, warning, error, alert, emerg, crit (case-insensitive).
|
|
*
|
|
* @retval 0 Success.
|
|
* @retval -1 Failure: log_level is not valid.
|
|
*/
|
|
int
|
|
lsquic_set_log_level (const char *log_level);
|
|
|
|
/**
|
|
* E.g. "event=debug"
|
|
*/
|
|
int
|
|
lsquic_logger_lopt (const char *optarg);
|
|
|
|
/**
|
|
* Return the list of QUIC versions (as bitmask) this engine instance
|
|
* supports.
|
|
*/
|
|
unsigned lsquic_engine_quic_versions (const lsquic_engine_t *);
|
|
|
|
/**
|
|
* This is one of the flags that can be passed to @ref lsquic_global_init.
|
|
* Use it to initialize LSQUIC for use in client mode.
|
|
*/
|
|
#define LSQUIC_GLOBAL_CLIENT (1 << 0)
|
|
|
|
/**
|
|
* This is one of the flags that can be passed to @ref lsquic_global_init.
|
|
* Use it to initialize LSQUIC for use in server mode.
|
|
*/
|
|
#define LSQUIC_GLOBAL_SERVER (1 << 1)
|
|
|
|
/**
|
|
* Initialize LSQUIC. This must be called before any other LSQUIC function
|
|
* is called. Returns 0 on success and -1 on failure.
|
|
*
|
|
* @param flags This a bitmask of @ref LSQUIC_GLOBAL_CLIENT and
|
|
* @ref LSQUIC_GLOBAL_SERVER. At least one of these
|
|
* flags should be specified.
|
|
*
|
|
* @retval 0 Success.
|
|
* @retval -1 Initialization failed.
|
|
*
|
|
* @see LSQUIC_GLOBAL_CLIENT
|
|
* @see LSQUIC_GLOBAL_SERVER
|
|
*/
|
|
int
|
|
lsquic_global_init (int flags);
|
|
|
|
/**
|
|
* Clean up global state created by @ref lsquic_global_init. Should be
|
|
* called after all LSQUIC engine instances are gone.
|
|
*/
|
|
void
|
|
lsquic_global_cleanup (void);
|
|
|
|
/**
|
|
* Get QUIC version used by the connection.
|
|
*
|
|
* @see lsquic_version
|
|
*/
|
|
enum lsquic_version
|
|
lsquic_conn_quic_version (const lsquic_conn_t *c);
|
|
|
|
/* Return keysize or -1 on error */
|
|
int
|
|
lsquic_conn_crypto_keysize (const lsquic_conn_t *c);
|
|
|
|
/* Return algorithm keysize or -1 on error */
|
|
int
|
|
lsquic_conn_crypto_alg_keysize (const lsquic_conn_t *c);
|
|
|
|
enum lsquic_crypto_ver
|
|
{
|
|
LSQ_CRY_QUIC,
|
|
LSQ_CRY_TLSv13,
|
|
};
|
|
|
|
enum lsquic_crypto_ver
|
|
lsquic_conn_crypto_ver (const lsquic_conn_t *c);
|
|
|
|
/* Return cipher or NULL on error */
|
|
const char *
|
|
lsquic_conn_crypto_cipher (const lsquic_conn_t *c);
|
|
|
|
/** Translate string QUIC version to LSQUIC QUIC version representation */
|
|
enum lsquic_version
|
|
lsquic_str2ver (const char *str, size_t len);
|
|
|
|
/** Translate ALPN (e.g. "h3", "h3-23", "h3-Q046") to LSQUIC enum */
|
|
enum lsquic_version
|
|
lsquic_alpn2ver (const char *alpn, size_t len);
|
|
|
|
/**
|
|
* This function closes all mini connections and marks all full connections
|
|
* as going away. In server mode, this also causes the engine to stop
|
|
* creating new connections.
|
|
*/
|
|
void
|
|
lsquic_engine_cooldown (lsquic_engine_t *);
|
|
|
|
/**
|
|
* Get user-supplied context associated with the connection.
|
|
*/
|
|
lsquic_conn_ctx_t *
|
|
lsquic_conn_get_ctx (const lsquic_conn_t *);
|
|
|
|
/**
|
|
* Set user-supplied context associated with the connection.
|
|
*/
|
|
void
|
|
lsquic_conn_set_ctx (lsquic_conn_t *, lsquic_conn_ctx_t *);
|
|
|
|
/**
|
|
* Get peer context associated with the connection.
|
|
*/
|
|
void *
|
|
lsquic_conn_get_peer_ctx (lsquic_conn_t *, const struct sockaddr *local_sa);
|
|
|
|
/**
|
|
* Abort connection.
|
|
*/
|
|
void
|
|
lsquic_conn_abort (lsquic_conn_t *);
|
|
|
|
/**
|
|
* Helper function: convert list of versions as specified in the argument
|
|
* bitmask to string that can be included as argument to "v=" part of the
|
|
* Alt-Svc header.
|
|
*
|
|
* For example (1<<LSQVER_037)|(1<<LSQVER_038) => "37,38"
|
|
*
|
|
* This is only applicable to Google QUIC versions.
|
|
*/
|
|
const char *
|
|
lsquic_get_alt_svc_versions (unsigned versions);
|
|
|
|
/**
|
|
* Return a NULL-terminated list of HTTP/3 ALPNs, e.g "h3-17", "h3-18", "h3".
|
|
*/
|
|
const char *const *
|
|
lsquic_get_h3_alpns (unsigned versions);
|
|
|
|
/**
|
|
* Returns true if provided buffer could be a valid handshake-stage packet,
|
|
* false otherwise. Do not call this function if a connection has already
|
|
* been established: it will return incorrect result.
|
|
*/
|
|
int
|
|
lsquic_is_valid_hs_packet (lsquic_engine_t *, const unsigned char *, size_t);
|
|
|
|
/**
|
|
* Parse cid from packet stored in `buf' and store it to `cid'. Returns 0
|
|
* on success and -1 on failure.
|
|
*/
|
|
int
|
|
lsquic_cid_from_packet (const unsigned char *, size_t bufsz, lsquic_cid_t *cid);
|
|
|
|
/**
|
|
* Returns true if there are connections to be processed, false otherwise.
|
|
* If true, `diff' is set to the difference between the earliest advisory
|
|
* tick time and now. If the former is in the past, the value of `diff'
|
|
* is negative.
|
|
*/
|
|
int
|
|
lsquic_engine_earliest_adv_tick (lsquic_engine_t *engine, int *diff);
|
|
|
|
/**
|
|
* Return number of connections whose advisory tick time is before current
|
|
* time plus `from_now' microseconds from now. `from_now' can be negative.
|
|
*/
|
|
unsigned
|
|
lsquic_engine_count_attq (lsquic_engine_t *engine, int from_now);
|
|
|
|
enum LSQUIC_CONN_STATUS
|
|
{
|
|
LSCONN_ST_HSK_IN_PROGRESS,
|
|
LSCONN_ST_CONNECTED,
|
|
LSCONN_ST_HSK_FAILURE,
|
|
LSCONN_ST_GOING_AWAY,
|
|
LSCONN_ST_TIMED_OUT,
|
|
/* If es_honor_prst is not set, the connection will never get public
|
|
* reset packets and this flag will not be set.
|
|
*/
|
|
LSCONN_ST_RESET,
|
|
LSCONN_ST_USER_ABORTED,
|
|
LSCONN_ST_ERROR,
|
|
LSCONN_ST_CLOSED,
|
|
LSCONN_ST_PEER_GOING_AWAY,
|
|
};
|
|
|
|
enum LSQUIC_CONN_STATUS
|
|
lsquic_conn_status (lsquic_conn_t *, char *errbuf, size_t bufsz);
|
|
|
|
extern const char *const
|
|
lsquic_ver2str[N_LSQVER];
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif //__LSQUIC_H__
|
|
|