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/*
* ngtcp2
*
* Copyright (c) 2017 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_PKT_H
#define NGTCP2_PKT_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
/* QUIC header macros */
#define NGTCP2_HEADER_FORM_BIT 0x80
#define NGTCP2_FIXED_BIT_MASK 0x40
#define NGTCP2_PKT_NUMLEN_MASK 0x03
/* Long header specific macros */
#define NGTCP2_LONG_TYPE_MASK 0x30
#define NGTCP2_LONG_RESERVED_BIT_MASK 0x0c
/* Short header specific macros */
#define NGTCP2_SHORT_SPIN_BIT_MASK 0x20
#define NGTCP2_SHORT_RESERVED_BIT_MASK 0x18
#define NGTCP2_SHORT_KEY_PHASE_BIT 0x04
/* NGTCP2_SR_TYPE is a Type field of Stateless Reset. */
#define NGTCP2_SR_TYPE 0x1f
/* NGTCP2_MIN_LONG_HEADERLEN is the minimum length of long header.
That is (1|1|TT|RR|PP)<1> + VERSION<4> + DCIL<1> + SCIL<1> +
LENGTH<1> + PKN<1> */
#define NGTCP2_MIN_LONG_HEADERLEN (1 + 4 + 1 + 1 + 1 + 1)
#define NGTCP2_STREAM_FIN_BIT 0x01
#define NGTCP2_STREAM_LEN_BIT 0x02
#define NGTCP2_STREAM_OFF_BIT 0x04
/* NGTCP2_STREAM_OVERHEAD is the maximum number of bytes required
other than payload for STREAM frame. That is from type field to
the beginning of the payload. */
#define NGTCP2_STREAM_OVERHEAD (1 + 8 + 8 + 8)
/* NGTCP2_CRYPTO_OVERHEAD is the maximum number of bytes required
other than payload for CRYPTO frame. That is from type field to
the beginning of the payload. */
#define NGTCP2_CRYPTO_OVERHEAD (1 + 8 + 8)
/* NGTCP2_DATAGRAM_OVERHEAD is the maximum number of bytes required
other than payload for DATAGRAM frame. That is from type field to
the beginning of the payload. */
#define NGTCP2_DATAGRAM_OVERHEAD (1 + 8)
/* NGTCP2_MIN_FRAME_PAYLOADLEN is the minimum frame payload length. */
#define NGTCP2_MIN_FRAME_PAYLOADLEN 16
/* NGTCP2_MAX_SERVER_STREAM_ID_BIDI is the maximum bidirectional
server stream ID. */
#define NGTCP2_MAX_SERVER_STREAM_ID_BIDI ((int64_t)0x3ffffffffffffffdll)
/* NGTCP2_MAX_CLIENT_STREAM_ID_BIDI is the maximum bidirectional
client stream ID. */
#define NGTCP2_MAX_CLIENT_STREAM_ID_BIDI ((int64_t)0x3ffffffffffffffcll)
/* NGTCP2_MAX_SERVER_STREAM_ID_UNI is the maximum unidirectional
server stream ID. */
#define NGTCP2_MAX_SERVER_STREAM_ID_UNI ((int64_t)0x3fffffffffffffffll)
/* NGTCP2_MAX_CLIENT_STREAM_ID_UNI is the maximum unidirectional
client stream ID. */
#define NGTCP2_MAX_CLIENT_STREAM_ID_UNI ((int64_t)0x3ffffffffffffffell)
/* NGTCP2_MAX_NUM_ACK_RANGES is the maximum number of Additional ACK
ranges which this library can create, or decode. */
#define NGTCP2_MAX_ACK_RANGES 32
/* NGTCP2_MAX_PKT_NUM is the maximum packet number. */
#define NGTCP2_MAX_PKT_NUM ((int64_t)((1ll << 62) - 1))
/* NGTCP2_MIN_PKT_EXPANDLEN is the minimum packet size expansion in
addition to the minimum DCID length to hide/trigger Stateless
Reset. */
#define NGTCP2_MIN_PKT_EXPANDLEN 22
/* NGTCP2_RETRY_TAGLEN is the length of Retry packet integrity tag. */
#define NGTCP2_RETRY_TAGLEN 16
/* NGTCP2_HARD_MAX_UDP_PAYLOAD_SIZE is the maximum UDP payload size
that this library can write. */
#define NGTCP2_HARD_MAX_UDP_PAYLOAD_SIZE ((1 << 24) - 1)
/* NGTCP2_PKT_LENGTHLEN is the number of bytes that is occupied by
Length field in Long packet header. */
#define NGTCP2_PKT_LENGTHLEN 4
/* NGTCP2_PKT_TYPE_INITIAL_V1 is Initial long header packet type for
QUIC v1. */
#define NGTCP2_PKT_TYPE_INITIAL_V1 0x0
/* NGTCP2_PKT_TYPE_0RTT_V1 is 0RTT long header packet type for QUIC
v1. */
#define NGTCP2_PKT_TYPE_0RTT_V1 0x1
/* NGTCP2_PKT_TYPE_HANDSHAKE_V1 is Handshake long header packet type
for QUIC v1. */
#define NGTCP2_PKT_TYPE_HANDSHAKE_V1 0x2
/* NGTCP2_PKT_TYPE_RETRY_V1 is Retry long header packet type for QUIC
v1. */
#define NGTCP2_PKT_TYPE_RETRY_V1 0x3
/* NGTCP2_PKT_TYPE_INITIAL_V2 is Initial long header packet type for
QUIC v2. */
#define NGTCP2_PKT_TYPE_INITIAL_V2 0x1
/* NGTCP2_PKT_TYPE_0RTT_V2 is 0RTT long header packet type for QUIC
v2. */
#define NGTCP2_PKT_TYPE_0RTT_V2 0x2
/* NGTCP2_PKT_TYPE_HANDSHAKE_V2 is Handshake long header packet type
for QUIC v2. */
#define NGTCP2_PKT_TYPE_HANDSHAKE_V2 0x3
/* NGTCP2_PKT_TYPE_RETRY_V2 is Retry long header packet type for QUIC
v2. */
#define NGTCP2_PKT_TYPE_RETRY_V2 0x0
typedef struct ngtcp2_pkt_retry {
ngtcp2_cid odcid;
uint8_t *token;
size_t tokenlen;
uint8_t tag[NGTCP2_RETRY_TAGLEN];
} ngtcp2_pkt_retry;
#define NGTCP2_FRAME_PADDING 0x00
#define NGTCP2_FRAME_PING 0x01
#define NGTCP2_FRAME_ACK 0x02
#define NGTCP2_FRAME_ACK_ECN 0x03
#define NGTCP2_FRAME_RESET_STREAM 0x04
#define NGTCP2_FRAME_STOP_SENDING 0x05
#define NGTCP2_FRAME_CRYPTO 0x06
#define NGTCP2_FRAME_NEW_TOKEN 0x07
#define NGTCP2_FRAME_STREAM 0x08
#define NGTCP2_FRAME_MAX_DATA 0x10
#define NGTCP2_FRAME_MAX_STREAM_DATA 0x11
#define NGTCP2_FRAME_MAX_STREAMS_BIDI 0x12
#define NGTCP2_FRAME_MAX_STREAMS_UNI 0x13
#define NGTCP2_FRAME_DATA_BLOCKED 0x14
#define NGTCP2_FRAME_STREAM_DATA_BLOCKED 0x15
#define NGTCP2_FRAME_STREAMS_BLOCKED_BIDI 0x16
#define NGTCP2_FRAME_STREAMS_BLOCKED_UNI 0x17
#define NGTCP2_FRAME_NEW_CONNECTION_ID 0x18
#define NGTCP2_FRAME_RETIRE_CONNECTION_ID 0x19
#define NGTCP2_FRAME_PATH_CHALLENGE 0x1a
#define NGTCP2_FRAME_PATH_RESPONSE 0x1b
#define NGTCP2_FRAME_CONNECTION_CLOSE 0x1c
#define NGTCP2_FRAME_CONNECTION_CLOSE_APP 0x1d
#define NGTCP2_FRAME_HANDSHAKE_DONE 0x1e
#define NGTCP2_FRAME_DATAGRAM 0x30
#define NGTCP2_FRAME_DATAGRAM_LEN 0x31
/* ngtcp2_stream represents STREAM and CRYPTO frames. */
typedef struct ngtcp2_stream {
uint64_t type;
/**
* flags of decoded STREAM frame. This gets ignored when encoding
* STREAM frame. CRYPTO frame does not include this field, and must
* set it to 0.
*/
uint8_t flags;
/* CRYPTO frame does not include this field, and must set it to
0. */
uint8_t fin;
/* CRYPTO frame does not include this field, and must set it to
0. */
int64_t stream_id;
uint64_t offset;
/* datacnt is the number of elements that data contains. Although
the length of data is 1 in this definition, the library may
allocate extra bytes to hold more elements. */
size_t datacnt;
/* data is the array of ngtcp2_vec which references data. */
ngtcp2_vec data[1];
} ngtcp2_stream;
typedef struct ngtcp2_ack_range {
uint64_t gap;
uint64_t len;
} ngtcp2_ack_range;
typedef struct ngtcp2_ack {
uint64_t type;
int64_t largest_ack;
uint64_t ack_delay;
/**
* ack_delay_unscaled is an ack_delay multiplied by
* 2**ack_delay_component * NGTCP2_MICROSECONDS.
*/
ngtcp2_duration ack_delay_unscaled;
struct {
uint64_t ect0;
uint64_t ect1;
uint64_t ce;
} ecn;
uint64_t first_ack_range;
size_t rangecnt;
ngtcp2_ack_range ranges[1];
} ngtcp2_ack;
typedef struct ngtcp2_padding {
uint64_t type;
/**
* The length of contiguous PADDING frames.
*/
size_t len;
} ngtcp2_padding;
typedef struct ngtcp2_reset_stream {
uint64_t type;
int64_t stream_id;
uint64_t app_error_code;
uint64_t final_size;
} ngtcp2_reset_stream;
typedef struct ngtcp2_connection_close {
uint64_t type;
uint64_t error_code;
uint64_t frame_type;
size_t reasonlen;
uint8_t *reason;
} ngtcp2_connection_close;
typedef struct ngtcp2_max_data {
uint64_t type;
/**
* max_data is Maximum Data.
*/
uint64_t max_data;
} ngtcp2_max_data;
typedef struct ngtcp2_max_stream_data {
uint64_t type;
int64_t stream_id;
uint64_t max_stream_data;
} ngtcp2_max_stream_data;
typedef struct ngtcp2_max_streams {
uint64_t type;
uint64_t max_streams;
} ngtcp2_max_streams;
typedef struct ngtcp2_ping {
uint64_t type;
} ngtcp2_ping;
typedef struct ngtcp2_data_blocked {
uint64_t type;
uint64_t offset;
} ngtcp2_data_blocked;
typedef struct ngtcp2_stream_data_blocked {
uint64_t type;
int64_t stream_id;
uint64_t offset;
} ngtcp2_stream_data_blocked;
typedef struct ngtcp2_streams_blocked {
uint64_t type;
uint64_t max_streams;
} ngtcp2_streams_blocked;
typedef struct ngtcp2_new_connection_id {
uint64_t type;
uint64_t seq;
uint64_t retire_prior_to;
ngtcp2_cid cid;
uint8_t stateless_reset_token[NGTCP2_STATELESS_RESET_TOKENLEN];
} ngtcp2_new_connection_id;
typedef struct ngtcp2_stop_sending {
uint64_t type;
int64_t stream_id;
uint64_t app_error_code;
} ngtcp2_stop_sending;
typedef struct ngtcp2_path_challenge {
uint64_t type;
uint8_t data[NGTCP2_PATH_CHALLENGE_DATALEN];
} ngtcp2_path_challenge;
typedef struct ngtcp2_path_response {
uint64_t type;
uint8_t data[NGTCP2_PATH_CHALLENGE_DATALEN];
} ngtcp2_path_response;
typedef struct ngtcp2_new_token {
uint64_t type;
uint8_t *token;
size_t tokenlen;
} ngtcp2_new_token;
typedef struct ngtcp2_retire_connection_id {
uint64_t type;
uint64_t seq;
} ngtcp2_retire_connection_id;
typedef struct ngtcp2_handshake_done {
uint64_t type;
} ngtcp2_handshake_done;
typedef struct ngtcp2_datagram {
uint64_t type;
/* dgram_id is an opaque identifier chosen by an application. */
uint64_t dgram_id;
/* datacnt is the number of elements that data contains. */
size_t datacnt;
/* data is a pointer to ngtcp2_vec array that stores data. */
ngtcp2_vec *data;
/* rdata is conveniently embedded to ngtcp2_datagram, so that data
field can just point to the address of this field to store a
single vector which is the case when DATAGRAM is received from a
remote endpoint. */
ngtcp2_vec rdata[1];
} ngtcp2_datagram;
typedef union ngtcp2_frame {
uint64_t type;
ngtcp2_stream stream;
ngtcp2_ack ack;
ngtcp2_padding padding;
ngtcp2_reset_stream reset_stream;
ngtcp2_connection_close connection_close;
ngtcp2_max_data max_data;
ngtcp2_max_stream_data max_stream_data;
ngtcp2_max_streams max_streams;
ngtcp2_ping ping;
ngtcp2_data_blocked data_blocked;
ngtcp2_stream_data_blocked stream_data_blocked;
ngtcp2_streams_blocked streams_blocked;
ngtcp2_new_connection_id new_connection_id;
ngtcp2_stop_sending stop_sending;
ngtcp2_path_challenge path_challenge;
ngtcp2_path_response path_response;
ngtcp2_new_token new_token;
ngtcp2_retire_connection_id retire_connection_id;
ngtcp2_handshake_done handshake_done;
ngtcp2_datagram datagram;
} ngtcp2_frame;
typedef struct ngtcp2_pkt_chain ngtcp2_pkt_chain;
/*
* ngtcp2_pkt_chain is the chain of incoming packets buffered.
*/
struct ngtcp2_pkt_chain {
ngtcp2_path_storage path;
ngtcp2_pkt_info pi;
ngtcp2_pkt_chain *next;
uint8_t *pkt;
/* pktlen is length of a QUIC packet. */
size_t pktlen;
/* dgramlen is length of UDP datagram that a QUIC packet is
included. */
size_t dgramlen;
ngtcp2_tstamp ts;
};
/*
* ngtcp2_pkt_chain_new allocates ngtcp2_pkt_chain objects, and
* assigns its pointer to |*ppc|. The content of buffer pointed by
* |pkt| of length |pktlen| is copied into |*ppc|. The packet is
* obtained via the network |path|. The values of path->local and
* path->remote are copied into |*ppc|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOMEM
* Out of memory.
*/
int ngtcp2_pkt_chain_new(ngtcp2_pkt_chain **ppc, const ngtcp2_path *path,
const ngtcp2_pkt_info *pi, const uint8_t *pkt,
size_t pktlen, size_t dgramlen, ngtcp2_tstamp ts,
const ngtcp2_mem *mem);
/*
* ngtcp2_pkt_chain_del deallocates |pc|. It also frees the memory
* pointed by |pc|.
*/
void ngtcp2_pkt_chain_del(ngtcp2_pkt_chain *pc, const ngtcp2_mem *mem);
/*
* ngtcp2_pkt_hd_init initializes |hd| with the given values. If
* |dcid| and/or |scid| is NULL, DCID and SCID of |hd| is empty
* respectively. |pkt_numlen| is the number of bytes used to encode
* |pkt_num| and either 1, 2, or 4. |version| is QUIC version for
* long header. |len| is the length field of Initial, 0RTT, and
* Handshake packets.
*/
void ngtcp2_pkt_hd_init(ngtcp2_pkt_hd *hd, uint8_t flags, uint8_t type,
const ngtcp2_cid *dcid, const ngtcp2_cid *scid,
int64_t pkt_num, size_t pkt_numlen, uint32_t version,
size_t len);
/*
* ngtcp2_pkt_encode_hd_long encodes |hd| as QUIC long header into
* |out| which has length |outlen|. It returns the number of bytes
* written into |outlen| if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer is too short
*/
ngtcp2_ssize ngtcp2_pkt_encode_hd_long(uint8_t *out, size_t outlen,
const ngtcp2_pkt_hd *hd);
/*
* ngtcp2_pkt_encode_hd_short encodes |hd| as QUIC short header into
* |out| which has length |outlen|. It returns the number of bytes
* written into |outlen| if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer is too short
*/
ngtcp2_ssize ngtcp2_pkt_encode_hd_short(uint8_t *out, size_t outlen,
const ngtcp2_pkt_hd *hd);
/**
* @function
*
* `ngtcp2_pkt_decode_frame` decodes a QUIC frame from the buffer
* pointed by |payload| whose length is |payloadlen|.
*
* This function returns the number of bytes read to decode a single
* frame if it succeeds, or one of the following negative error codes:
*
* :enum:`NGTCP2_ERR_FRAME_ENCODING`
* Frame is badly formatted; or frame type is unknown; or
* |payloadlen| is 0.
*/
ngtcp2_ssize ngtcp2_pkt_decode_frame(ngtcp2_frame *dest, const uint8_t *payload,
size_t payloadlen);
/**
* @function
*
* `ngtcp2_pkt_encode_frame` encodes a frame |fm| into the buffer
* pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written to the buffer, or
* one of the following negative error codes:
*
* :enum:`NGTCP2_ERR_NOBUF`
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_frame(uint8_t *out, size_t outlen,
ngtcp2_frame *fr);
/*
* ngtcp2_pkt_decode_version_negotiation decodes Version Negotiation
* packet payload |payload| of length |payloadlen|, and stores the
* result in |dest|. |dest| must have enough capacity to store the
* result. |payloadlen| also must be a multiple of sizeof(uint32_t).
*
* This function returns the number of versions written in |dest|.
*/
size_t ngtcp2_pkt_decode_version_negotiation(uint32_t *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_stateless_reset decodes Stateless Reset payload
* |payload| of length |payloadlen|. The |payload| must start with
* Stateless Reset Token.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_INVALID_ARGUMENT
* Payloadlen is too short.
*/
int ngtcp2_pkt_decode_stateless_reset(ngtcp2_pkt_stateless_reset *sr,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_retry decodes Retry packet payload |payload| of
* length |payloadlen|. The |payload| must start with Retry token
* field.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_INVALID_ARGUMENT
* Payloadlen is too short.
*/
int ngtcp2_pkt_decode_retry(ngtcp2_pkt_retry *dest, const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_stream_frame decodes STREAM frame from |payload|
* of length |payloadlen|. The result is stored in the object pointed
* by |dest|. STREAM frame must start at payload[0]. This function
* finishes when it decodes one STREAM frame, and returns the exact
* number of bytes read to decode a frame if it succeeds, or one of
* the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include STREAM frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_stream_frame(ngtcp2_stream *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_ack_frame decodes ACK frame from |payload| of
* length |payloadlen|. The result is stored in the object pointed by
* |dest|. ACK frame must start at payload[0]. This function
* finishes when it decodes one ACK frame, and returns the exact
* number of bytes read to decode a frame if it succeeds, or one of
* the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include ACK frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_ack_frame(ngtcp2_ack *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_padding_frame decodes contiguous PADDING frames
* from |payload| of length |payloadlen|. It continues to parse
* frames as long as the frame type is PADDING. This finishes when it
* encounters the frame type which is not PADDING, or all input data
* is read. The first byte (payload[0]) must be NGTCP2_FRAME_PADDING.
* This function returns the exact number of bytes read to decode
* PADDING frames.
*/
ngtcp2_ssize ngtcp2_pkt_decode_padding_frame(ngtcp2_padding *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_reset_stream_frame decodes RESET_STREAM frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. RESET_STREAM frame must start at
* payload[0]. This function finishes when it decodes one
* RESET_STREAM frame, and returns the exact number of bytes read to
* decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include RESET_STREAM frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_reset_stream_frame(ngtcp2_reset_stream *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_connection_close_frame decodes CONNECTION_CLOSE
* frame from |payload| of length |payloadlen|. The result is stored
* in the object pointed by |dest|. CONNECTION_CLOSE frame must start
* at payload[0]. This function finishes it decodes one
* CONNECTION_CLOSE frame, and returns the exact number of bytes read
* to decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include CONNECTION_CLOSE frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_connection_close_frame(
ngtcp2_connection_close *dest, const uint8_t *payload, size_t payloadlen);
/*
* ngtcp2_pkt_decode_max_data_frame decodes MAX_DATA frame from
* |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. MAX_DATA frame must start at payload[0].
* This function finishes when it decodes one MAX_DATA frame, and
* returns the exact number of bytes read to decode a frame if it
* succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include MAX_DATA frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_max_data_frame(ngtcp2_max_data *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_max_stream_data_frame decodes MAX_STREAM_DATA
* frame from |payload| of length |payloadlen|. The result is stored
* in the object pointed by |dest|. MAX_STREAM_DATA frame must start
* at payload[0]. This function finishes when it decodes one
* MAX_STREAM_DATA frame, and returns the exact number of bytes read
* to decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include MAX_STREAM_DATA frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_max_stream_data_frame(
ngtcp2_max_stream_data *dest, const uint8_t *payload, size_t payloadlen);
/*
* ngtcp2_pkt_decode_max_streams_frame decodes MAX_STREAMS frame from
* |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. MAX_STREAMS frame must start at
* payload[0]. This function finishes when it decodes one MAX_STREAMS
* frame, and returns the exact number of bytes read to decode a frame
* if it succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include MAX_STREAMS frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_max_streams_frame(ngtcp2_max_streams *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_ping_frame decodes PING frame from |payload| of
* length |payloadlen|. The result is stored in the object pointed by
* |dest|. PING frame must start at payload[0]. This function
* finishes when it decodes one PING frame, and returns the exact
* number of bytes read to decode a frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_ping_frame(ngtcp2_ping *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_data_blocked_frame decodes DATA_BLOCKED frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. DATA_BLOCKED frame must start at
* payload[0]. This function finishes when it decodes one
* DATA_BLOCKED frame, and returns the exact number of bytes read to
* decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include DATA_BLOCKED frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_data_blocked_frame(ngtcp2_data_blocked *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_stream_data_blocked_frame decodes
* STREAM_DATA_BLOCKED frame from |payload| of length |payloadlen|.
* The result is stored in the object pointed by |dest|.
* STREAM_DATA_BLOCKED frame must start at payload[0]. This function
* finishes when it decodes one STREAM_DATA_BLOCKED frame, and returns
* the exact number of bytes read to decode a frame if it succeeds, or
* one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include STREAM_DATA_BLOCKED frame.
*/
ngtcp2_ssize
ngtcp2_pkt_decode_stream_data_blocked_frame(ngtcp2_stream_data_blocked *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_streams_blocked_frame decodes STREAMS_BLOCKED
* frame from |payload| of length |payloadlen|. The result is stored
* in the object pointed by |dest|. STREAMS_BLOCKED frame must start
* at payload[0]. This function finishes when it decodes one
* STREAMS_BLOCKED frame, and returns the exact number of bytes read
* to decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include STREAMS_BLOCKED frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_streams_blocked_frame(
ngtcp2_streams_blocked *dest, const uint8_t *payload, size_t payloadlen);
/*
* ngtcp2_pkt_decode_new_connection_id_frame decodes NEW_CONNECTION_ID
* frame from |payload| of length |payloadlen|. The result is stored
* in the object pointed by |dest|. NEW_CONNECTION_ID frame must
* start at payload[0]. This function finishes when it decodes one
* NEW_CONNECTION_ID frame, and returns the exact number of bytes read
* to decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include NEW_CONNECTION_ID frame; or the
* length of CID is strictly less than NGTCP2_MIN_CIDLEN or
* greater than NGTCP2_MAX_CIDLEN.
*/
ngtcp2_ssize ngtcp2_pkt_decode_new_connection_id_frame(
ngtcp2_new_connection_id *dest, const uint8_t *payload, size_t payloadlen);
/*
* ngtcp2_pkt_decode_stop_sending_frame decodes STOP_SENDING frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. STOP_SENDING frame must start at
* payload[0]. This function finishes when it decodes one
* STOP_SENDING frame, and returns the exact number of bytes read to
* decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include STOP_SENDING frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_stop_sending_frame(ngtcp2_stop_sending *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_path_challenge_frame decodes PATH_CHALLENGE frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. PATH_CHALLENGE frame must start at
* payload[0]. This function finishes when it decodes one
* PATH_CHALLENGE frame, and returns the exact number of bytes read to
* decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include PATH_CHALLENGE frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_path_challenge_frame(ngtcp2_path_challenge *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_path_response_frame decodes PATH_RESPONSE frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. PATH_RESPONSE frame must start at
* payload[0]. This function finishes when it decodes one
* PATH_RESPONSE frame, and returns the exact number of bytes read to
* decode a frame if it succeeds, or one of the following negative
* error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include PATH_RESPONSE frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_path_response_frame(ngtcp2_path_response *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_crypto_frame decodes CRYPTO frame from |payload|
* of length |payloadlen|. The result is stored in the object pointed
* by |dest|. CRYPTO frame must start at payload[0]. This function
* finishes when it decodes one CRYPTO frame, and returns the exact
* number of bytes read to decode a frame if it succeeds, or one of
* the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include CRYPTO frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_crypto_frame(ngtcp2_stream *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_new_token_frame decodes NEW_TOKEN frame from
* |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. NEW_TOKEN frame must start at
* payload[0]. This function finishes when it decodes one NEW_TOKEN
* frame, and returns the exact number of bytes read to decode a frame
* if it succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include NEW_TOKEN frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_new_token_frame(ngtcp2_new_token *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_retire_connection_id_frame decodes RETIRE_CONNECTION_ID
* frame from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. RETIRE_CONNECTION_ID frame must start at
* payload[0]. This function finishes when it decodes one RETIRE_CONNECTION_ID
* frame, and returns the exact number of bytes read to decode a frame
* if it succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include RETIRE_CONNECTION_ID frame.
*/
ngtcp2_ssize
ngtcp2_pkt_decode_retire_connection_id_frame(ngtcp2_retire_connection_id *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_handshake_done_frame decodes HANDSHAKE_DONE frame
* from |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. HANDSHAKE_DONE frame must start at
* payload[0]. This function finishes when it decodes one
* HANDSHAKE_DONE frame, and returns the exact number of bytes read to
* decode a frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_handshake_done_frame(ngtcp2_handshake_done *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_decode_datagram_frame decodes DATAGRAM frame from
* |payload| of length |payloadlen|. The result is stored in the
* object pointed by |dest|. DATAGRAM frame must start at payload[0].
* This function finishes when it decodes one DATAGRAM frame, and
* returns the exact number of bytes read to decode a frame if it
* succeeds, or one of the following negative error codes:
*
* NGTCP2_ERR_FRAME_ENCODING
* Payload is too short to include DATAGRAM frame.
*/
ngtcp2_ssize ngtcp2_pkt_decode_datagram_frame(ngtcp2_datagram *dest,
const uint8_t *payload,
size_t payloadlen);
/*
* ngtcp2_pkt_encode_stream_frame encodes STREAM frame |fr| into the
* buffer pointed by |out| of length |outlen|.
*
* This function assigns <the serialized frame type> &
* ~NGTCP2_FRAME_STREAM to fr->flags.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_stream_frame(uint8_t *out, size_t outlen,
ngtcp2_stream *fr);
/*
* ngtcp2_pkt_encode_ack_frame encodes ACK frame |fr| into the buffer
* pointed by |out| of length |outlen|.
*
* This function assigns <the serialized frame type> &
* ~NGTCP2_FRAME_ACK to fr->flags.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_ack_frame(uint8_t *out, size_t outlen,
ngtcp2_ack *fr);
/*
* ngtcp2_pkt_encode_padding_frame encodes PADDING frame |fr| into the
* buffer pointed by |out| of length |outlen|.
*
* This function encodes consecutive fr->len PADDING frames.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write frame(s).
*/
ngtcp2_ssize ngtcp2_pkt_encode_padding_frame(uint8_t *out, size_t outlen,
const ngtcp2_padding *fr);
/*
* ngtcp2_pkt_encode_reset_stream_frame encodes RESET_STREAM frame
* |fr| into the buffer pointed by |out| of length |buflen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_reset_stream_frame(uint8_t *out, size_t outlen,
const ngtcp2_reset_stream *fr);
/*
* ngtcp2_pkt_encode_connection_close_frame encodes CONNECTION_CLOSE
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_connection_close_frame(uint8_t *out, size_t outlen,
const ngtcp2_connection_close *fr);
/*
* ngtcp2_pkt_encode_max_data_frame encodes MAX_DATA frame |fr| into
* the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_max_data_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_data *fr);
/*
* ngtcp2_pkt_encode_max_stream_data_frame encodes MAX_STREAM_DATA
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_max_stream_data_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_stream_data *fr);
/*
* ngtcp2_pkt_encode_max_streams_frame encodes MAX_STREAMS
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_max_streams_frame(uint8_t *out, size_t outlen,
const ngtcp2_max_streams *fr);
/*
* ngtcp2_pkt_encode_ping_frame encodes PING frame |fr| into the
* buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_ping_frame(uint8_t *out, size_t outlen,
const ngtcp2_ping *fr);
/*
* ngtcp2_pkt_encode_data_blocked_frame encodes DATA_BLOCKED frame
* |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_data_blocked_frame(uint8_t *out, size_t outlen,
const ngtcp2_data_blocked *fr);
/*
* ngtcp2_pkt_encode_stream_data_blocked_frame encodes
* STREAM_DATA_BLOCKED frame |fr| into the buffer pointed by |out| of
* length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_stream_data_blocked_frame(
uint8_t *out, size_t outlen, const ngtcp2_stream_data_blocked *fr);
/*
* ngtcp2_pkt_encode_streams_blocked_frame encodes STREAMS_BLOCKED
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_streams_blocked_frame(uint8_t *out, size_t outlen,
const ngtcp2_streams_blocked *fr);
/*
* ngtcp2_pkt_encode_new_connection_id_frame encodes NEW_CONNECTION_ID
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_new_connection_id_frame(uint8_t *out, size_t outlen,
const ngtcp2_new_connection_id *fr);
/*
* ngtcp2_pkt_encode_stop_sending_frame encodes STOP_SENDING frame
* |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_stop_sending_frame(uint8_t *out, size_t outlen,
const ngtcp2_stop_sending *fr);
/*
* ngtcp2_pkt_encode_path_challenge_frame encodes PATH_CHALLENGE frame
* |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_path_challenge_frame(uint8_t *out, size_t outlen,
const ngtcp2_path_challenge *fr);
/*
* ngtcp2_pkt_encode_path_response_frame encodes PATH_RESPONSE frame
* |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_path_response_frame(uint8_t *out, size_t outlen,
const ngtcp2_path_response *fr);
/*
* ngtcp2_pkt_encode_crypto_frame encodes CRYPTO frame |fr| into the
* buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_crypto_frame(uint8_t *out, size_t outlen,
const ngtcp2_stream *fr);
/*
* ngtcp2_pkt_encode_new_token_frame encodes NEW_TOKEN frame |fr| into
* the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_new_token_frame(uint8_t *out, size_t outlen,
const ngtcp2_new_token *fr);
/*
* ngtcp2_pkt_encode_retire_connection_id_frame encodes RETIRE_CONNECTION_ID
* frame |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_retire_connection_id_frame(
uint8_t *out, size_t outlen, const ngtcp2_retire_connection_id *fr);
/*
* ngtcp2_pkt_encode_handshake_done_frame encodes HANDSHAKE_DONE frame
* |fr| into the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize
ngtcp2_pkt_encode_handshake_done_frame(uint8_t *out, size_t outlen,
const ngtcp2_handshake_done *fr);
/*
* ngtcp2_pkt_encode_datagram_frame encodes DATAGRAM frame |fr| into
* the buffer pointed by |out| of length |outlen|.
*
* This function returns the number of bytes written if it succeeds,
* or one of the following negative error codes:
*
* NGTCP2_ERR_NOBUF
* Buffer does not have enough capacity to write a frame.
*/
ngtcp2_ssize ngtcp2_pkt_encode_datagram_frame(uint8_t *out, size_t outlen,
const ngtcp2_datagram *fr);
/*
* ngtcp2_pkt_adjust_pkt_num find the full 64 bits packet number for
* |pkt_num|, which is encoded in |pkt_numlen| bytes. The
* |max_pkt_num| is the highest successfully authenticated packet
* number.
*/
int64_t ngtcp2_pkt_adjust_pkt_num(int64_t max_pkt_num, int64_t pkt_num,
size_t pkt_numlen);
/*
* ngtcp2_pkt_validate_ack checks that ack is malformed or not.
* |min_pkt_num| is the minimum packet number that an endpoint sends.
* It is an error to receive acknowledgements for a packet less than
* |min_pkt_num|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_ACK_FRAME
* ACK frame is malformed
* NGTCP2_ERR_PROTO
* |fr| contains a packet number less than |min_pkt_num|.
*/
int ngtcp2_pkt_validate_ack(ngtcp2_ack *fr, int64_t min_pkt_num);
/*
* ngtcp2_pkt_stream_max_datalen returns the maximum number of bytes
* which can be sent for stream denoted by |stream_id|. |offset| is
* an offset of within the stream. |len| is the estimated number of
* bytes to be sent. |left| is the size of buffer. If |left| is too
* small to write STREAM frame, this function returns (size_t)-1.
*/
size_t ngtcp2_pkt_stream_max_datalen(int64_t stream_id, uint64_t offset,
uint64_t len, size_t left);
/*
* ngtcp2_pkt_crypto_max_datalen returns the maximum number of bytes
* which can be sent for crypto stream. |offset| is an offset of
* within the crypto stream. |len| is the estimated number of bytes
* to be sent. |left| is the size of buffer. If |left| is too small
* to write CRYPTO frame, this function returns (size_t)-1.
*/
size_t ngtcp2_pkt_crypto_max_datalen(uint64_t offset, size_t len, size_t left);
/*
* ngtcp2_pkt_datagram_framelen returns the length of DATAGRAM frame
* to encode |len| bytes of data.
*/
size_t ngtcp2_pkt_datagram_framelen(size_t len);
/*
* ngtcp2_pkt_verify_reserved_bits verifies that the first byte |c| of
* the packet header has the correct reserved bits.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_PROTO
* Reserved bits has wrong value.
*/
int ngtcp2_pkt_verify_reserved_bits(uint8_t c);
/*
* ngtcp2_pkt_encode_pseudo_retry encodes Retry pseudo-packet in the
* buffer pointed by |dest| of length |destlen|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_BUF
* Buffer is too short.
*/
ngtcp2_ssize ngtcp2_pkt_encode_pseudo_retry(
uint8_t *dest, size_t destlen, const ngtcp2_pkt_hd *hd, uint8_t unused,
const ngtcp2_cid *odcid, const uint8_t *token, size_t tokenlen);
/*
* ngtcp2_pkt_verify_retry_tag verifies Retry packet. The buffer
* pointed by |pkt| of length |pktlen| must contain Retry packet
* including packet header. The odcid and tag fields of |retry| must
* be specified. |aead| must be AEAD_AES_128_GCM.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* NGTCP2_ERR_PROTO
* Verification failed.
*/
int ngtcp2_pkt_verify_retry_tag(uint32_t version, const ngtcp2_pkt_retry *retry,
const uint8_t *pkt, size_t pktlen,
ngtcp2_encrypt encrypt,
const ngtcp2_crypto_aead *aead,
const ngtcp2_crypto_aead_ctx *aead_ctx);
/*
* ngtcp2_pkt_versioned_type returns versioned packet type for a
* version |version| that corresponds to the version-independent
* |pkt_type|.
*/
uint8_t ngtcp2_pkt_versioned_type(uint32_t version, uint32_t pkt_type);
/**
* @function
*
* `ngtcp2_pkt_get_type_long` returns the version-independent long
* packet type. |version| is the QUIC version. |c| is the first byte
* of Long packet header. If |version| is not supported by the
* library, it returns 0.
*/
uint8_t ngtcp2_pkt_get_type_long(uint32_t version, uint8_t c);
#endif /* NGTCP2_PKT_H */
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