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openssl/include/internal/quic_wire.h

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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_INTERNAL_QUIC_WIRE_H
# define OSSL_INTERNAL_QUIC_WIRE_H
# pragma once
# include "internal/e_os.h"
# include "internal/time.h"
# include "internal/quic_types.h"
# include "internal/packet_quic.h"
# ifndef OPENSSL_NO_QUIC
# define OSSL_QUIC_FRAME_TYPE_PADDING 0x00
# define OSSL_QUIC_FRAME_TYPE_PING 0x01
# define OSSL_QUIC_FRAME_TYPE_ACK_WITHOUT_ECN 0x02
# define OSSL_QUIC_FRAME_TYPE_ACK_WITH_ECN 0x03
# define OSSL_QUIC_FRAME_TYPE_RESET_STREAM 0x04
# define OSSL_QUIC_FRAME_TYPE_STOP_SENDING 0x05
# define OSSL_QUIC_FRAME_TYPE_CRYPTO 0x06
# define OSSL_QUIC_FRAME_TYPE_NEW_TOKEN 0x07
# define OSSL_QUIC_FRAME_TYPE_MAX_DATA 0x10
# define OSSL_QUIC_FRAME_TYPE_MAX_STREAM_DATA 0x11
# define OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_BIDI 0x12
# define OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_UNI 0x13
# define OSSL_QUIC_FRAME_TYPE_DATA_BLOCKED 0x14
# define OSSL_QUIC_FRAME_TYPE_STREAM_DATA_BLOCKED 0x15
# define OSSL_QUIC_FRAME_TYPE_STREAMS_BLOCKED_BIDI 0x16
# define OSSL_QUIC_FRAME_TYPE_STREAMS_BLOCKED_UNI 0x17
# define OSSL_QUIC_FRAME_TYPE_NEW_CONN_ID 0x18
# define OSSL_QUIC_FRAME_TYPE_RETIRE_CONN_ID 0x19
# define OSSL_QUIC_FRAME_TYPE_PATH_CHALLENGE 0x1A
# define OSSL_QUIC_FRAME_TYPE_PATH_RESPONSE 0x1B
# define OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_TRANSPORT 0x1C
# define OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_APP 0x1D
# define OSSL_QUIC_FRAME_TYPE_HANDSHAKE_DONE 0x1E
# define OSSL_QUIC_FRAME_FLAG_STREAM_FIN 0x01
# define OSSL_QUIC_FRAME_FLAG_STREAM_LEN 0x02
# define OSSL_QUIC_FRAME_FLAG_STREAM_OFF 0x04
# define OSSL_QUIC_FRAME_FLAG_STREAM_MASK ((uint64_t)0x07)
/* Low 3 bits of the type contain flags */
# define OSSL_QUIC_FRAME_TYPE_STREAM 0x08 /* base ID */
# define OSSL_QUIC_FRAME_TYPE_STREAM_FIN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_FIN)
# define OSSL_QUIC_FRAME_TYPE_STREAM_LEN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_LEN)
# define OSSL_QUIC_FRAME_TYPE_STREAM_LEN_FIN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_LEN | \
OSSL_QUIC_FRAME_FLAG_STREAM_FIN)
# define OSSL_QUIC_FRAME_TYPE_STREAM_OFF \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_OFF)
# define OSSL_QUIC_FRAME_TYPE_STREAM_OFF_FIN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_OFF | \
OSSL_QUIC_FRAME_FLAG_STREAM_FIN)
# define OSSL_QUIC_FRAME_TYPE_STREAM_OFF_LEN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_OFF | \
OSSL_QUIC_FRAME_FLAG_STREAM_LEN)
# define OSSL_QUIC_FRAME_TYPE_STREAM_OFF_LEN_FIN \
(OSSL_QUIC_FRAME_TYPE_STREAM | \
OSSL_QUIC_FRAME_FLAG_STREAM_OFF | \
OSSL_QUIC_FRAME_FLAG_STREAM_LEN | \
OSSL_QUIC_FRAME_FLAG_STREAM_FIN)
# define OSSL_QUIC_FRAME_TYPE_IS_STREAM(x) \
(((x) & ~OSSL_QUIC_FRAME_FLAG_STREAM_MASK) == OSSL_QUIC_FRAME_TYPE_STREAM)
# define OSSL_QUIC_FRAME_TYPE_IS_ACK(x) \
(((x) & ~(uint64_t)1) == OSSL_QUIC_FRAME_TYPE_ACK_WITHOUT_ECN)
# define OSSL_QUIC_FRAME_TYPE_IS_MAX_STREAMS(x) \
(((x) & ~(uint64_t)1) == OSSL_QUIC_FRAME_TYPE_MAX_STREAMS_BIDI)
# define OSSL_QUIC_FRAME_TYPE_IS_STREAMS_BLOCKED(x) \
(((x) & ~(uint64_t)1) == OSSL_QUIC_FRAME_TYPE_STREAMS_BLOCKED_BIDI)
# define OSSL_QUIC_FRAME_TYPE_IS_CONN_CLOSE(x) \
(((x) & ~(uint64_t)1) == OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_TRANSPORT)
static ossl_unused ossl_inline int
ossl_quic_frame_type_is_ack_eliciting(uint64_t frame_type)
{
switch (frame_type) {
case OSSL_QUIC_FRAME_TYPE_PADDING:
case OSSL_QUIC_FRAME_TYPE_ACK_WITHOUT_ECN:
case OSSL_QUIC_FRAME_TYPE_ACK_WITH_ECN:
case OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_TRANSPORT:
case OSSL_QUIC_FRAME_TYPE_CONN_CLOSE_APP:
return 0;
default:
return 1;
}
}
/* QUIC Transport Parameter Types */
# define QUIC_TPARAM_ORIG_DCID 0x00
# define QUIC_TPARAM_MAX_IDLE_TIMEOUT 0x01
# define QUIC_TPARAM_STATELESS_RESET_TOKEN 0x02
# define QUIC_TPARAM_MAX_UDP_PAYLOAD_SIZE 0x03
# define QUIC_TPARAM_INITIAL_MAX_DATA 0x04
# define QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_LOCAL 0x05
# define QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_BIDI_REMOTE 0x06
# define QUIC_TPARAM_INITIAL_MAX_STREAM_DATA_UNI 0x07
# define QUIC_TPARAM_INITIAL_MAX_STREAMS_BIDI 0x08
# define QUIC_TPARAM_INITIAL_MAX_STREAMS_UNI 0x09
# define QUIC_TPARAM_ACK_DELAY_EXP 0x0A
# define QUIC_TPARAM_MAX_ACK_DELAY 0x0B
# define QUIC_TPARAM_DISABLE_ACTIVE_MIGRATION 0x0C
# define QUIC_TPARAM_PREFERRED_ADDR 0x0D
# define QUIC_TPARAM_ACTIVE_CONN_ID_LIMIT 0x0E
# define QUIC_TPARAM_INITIAL_SCID 0x0F
# define QUIC_TPARAM_RETRY_SCID 0x10
/*
* QUIC Frame Logical Representations
* ==================================
*/
/* QUIC Frame: ACK */
typedef struct ossl_quic_ack_range_st {
/*
* Represents an inclusive range of packet numbers [start, end].
* start must be <= end.
*/
QUIC_PN start, end;
} OSSL_QUIC_ACK_RANGE;
typedef struct ossl_quic_frame_ack_st {
/*
* A sequence of packet number ranges [[start, end]...].
*
* The ranges must be sorted in descending order, for example:
* [ 95, 100]
* [ 90, 92]
* etc.
*
* As such, ack_ranges[0].end is always the highest packet number
* being acknowledged and ack_ranges[num_ack_ranges-1].start is
* always the lowest packet number being acknowledged.
*
* num_ack_ranges must be greater than zero, as an ACK frame must
* acknowledge at least one packet number.
*/
OSSL_QUIC_ACK_RANGE *ack_ranges;
size_t num_ack_ranges;
OSSL_TIME delay_time;
uint64_t ect0, ect1, ecnce;
unsigned int ecn_present : 1;
} OSSL_QUIC_FRAME_ACK;
/* Returns 1 if the given frame contains the given PN. */
int ossl_quic_frame_ack_contains_pn(const OSSL_QUIC_FRAME_ACK *ack, QUIC_PN pn);
/* QUIC Frame: STREAM */
typedef struct ossl_quic_frame_stream_st {
uint64_t stream_id; /* Stream ID */
uint64_t offset; /* Logical offset in stream */
uint64_t len; /* Length of data in bytes */
const unsigned char *data;
/*
* On encode, this determines whether the len field should be encoded or
* not. If zero, the len field is not encoded and it is assumed the frame
* runs to the end of the packet.
*
* On decode, this determines whether the frame had an explicitly encoded
* length. If not set, the frame runs to the end of the packet and len has
* been set accordingly.
*/
unsigned int has_explicit_len : 1;
/* 1 if this is the end of the stream */
unsigned int is_fin : 1;
} OSSL_QUIC_FRAME_STREAM;
/* QUIC Frame: CRYPTO */
typedef struct ossl_quic_frame_crypto_st {
uint64_t offset; /* Logical offset in stream */
uint64_t len; /* Length of the data in bytes */
const unsigned char *data;
} OSSL_QUIC_FRAME_CRYPTO;
/* QUIC Frame: RESET_STREAM */
typedef struct ossl_quic_frame_reset_stream_st {
uint64_t stream_id;
uint64_t app_error_code;
uint64_t final_size;
} OSSL_QUIC_FRAME_RESET_STREAM;
/* QUIC Frame: STOP_SENDING */
typedef struct ossl_quic_frame_stop_sending_st {
uint64_t stream_id;
uint64_t app_error_code;
} OSSL_QUIC_FRAME_STOP_SENDING;
/* QUIC Frame: NEW_CONNECTION_ID */
typedef struct ossl_quic_frame_new_conn_id_st {
uint64_t seq_num;
uint64_t retire_prior_to;
QUIC_CONN_ID conn_id;
unsigned char stateless_reset_token[16];
} OSSL_QUIC_FRAME_NEW_CONN_ID;
/* QUIC Frame: CONNECTION_CLOSE */
typedef struct ossl_quic_frame_conn_close_st {
unsigned int is_app : 1; /* 0: transport error, 1: app error */
uint64_t error_code; /* 62-bit transport or app error code */
uint64_t frame_type; /* transport errors only */
char *reason; /* UTF-8 string, not necessarily zero-terminated */
size_t reason_len; /* Length of reason in bytes */
} OSSL_QUIC_FRAME_CONN_CLOSE;
/*
* QUIC Wire Format Encoding
* =========================
*
* These functions return 1 on success and 0 on failure.
*/
/*
* Encodes zero or more QUIC PADDING frames to the packet writer. Each PADDING
* frame consumes one byte; num_bytes specifies the number of bytes of padding
* to write.
*/
int ossl_quic_wire_encode_padding(WPACKET *pkt, size_t num_bytes);
/*
* Encodes a QUIC PING frame to the packet writer. This frame type takes
* no arguments.
*/
int ossl_quic_wire_encode_frame_ping(WPACKET *pkt);
/*
* Encodes a QUIC ACK frame to the packet writer, given a logical representation
* of the ACK frame.
*
* The ACK ranges passed must be sorted in descending order.
*
* The logical representation stores a list of packet number ranges. The wire
* encoding is slightly different and stores the first range in the list
* in a different manner.
*
* The ack_delay_exponent argument specifies the index of a power of two by
* which the ack->ack_delay field is be divided. This exponent value must match
* the value used when decoding.
*/
int ossl_quic_wire_encode_frame_ack(WPACKET *pkt,
uint32_t ack_delay_exponent,
const OSSL_QUIC_FRAME_ACK *ack);
/*
* Encodes a QUIC RESET_STREAM frame to the packet writer, given a logical
* representation of the RESET_STREAM frame.
*/
int ossl_quic_wire_encode_frame_reset_stream(WPACKET *pkt,
const OSSL_QUIC_FRAME_RESET_STREAM *f);
/*
* Encodes a QUIC STOP_SENDING frame to the packet writer, given a logical
* representation of the STOP_SENDING frame.
*/
int ossl_quic_wire_encode_frame_stop_sending(WPACKET *pkt,
const OSSL_QUIC_FRAME_STOP_SENDING *f);
/*
* Encodes a QUIC CRYPTO frame header to the packet writer.
*
* To create a well-formed frame, the data written using this function must be
* immediately followed by f->len bytes of data.
*/
int ossl_quic_wire_encode_frame_crypto_hdr(WPACKET *hdr,
const OSSL_QUIC_FRAME_CRYPTO *f);
/*
* Returns the number of bytes which will be required to encode the given
* CRYPTO frame header. Does not include the payload bytes in the count.
* Returns 0 if input is invalid.
*/
size_t ossl_quic_wire_get_encoded_frame_len_crypto_hdr(const OSSL_QUIC_FRAME_CRYPTO *f);
/*
* Encodes a QUIC CRYPTO frame to the packet writer.
*
* This function returns a pointer to a buffer of f->len bytes which the caller
* should fill however it wishes. If f->data is non-NULL, it is automatically
* copied to the target buffer, otherwise the caller must fill the returned
* buffer. Returns NULL on failure.
*/
void *ossl_quic_wire_encode_frame_crypto(WPACKET *pkt,
const OSSL_QUIC_FRAME_CRYPTO *f);
/*
* Encodes a QUIC NEW_TOKEN frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_new_token(WPACKET *pkt,
const unsigned char *token,
size_t token_len);
/*
* Encodes a QUIC STREAM frame's header to the packet writer. The f->stream_id,
* f->offset and f->len fields are the values for the respective Stream ID,
* Offset and Length fields.
*
* If f->is_fin is non-zero, the frame is marked as the final frame in the
* stream.
*
* If f->has_explicit_len is zerro, the frame is assumed to be the final frame
* in the packet, which the caller is responsible for ensuring; the Length
* field is then omitted.
*
* To create a well-formed frame, the data written using this function must be
* immediately followed by f->len bytes of stream data.
*/
int ossl_quic_wire_encode_frame_stream_hdr(WPACKET *pkt,
const OSSL_QUIC_FRAME_STREAM *f);
/*
* Returns the number of bytes which will be required to encode the given
* STREAM frame header. Does not include the payload bytes in the count.
* Returns 0 if input is invalid.
*/
size_t ossl_quic_wire_get_encoded_frame_len_stream_hdr(const OSSL_QUIC_FRAME_STREAM *f);
/*
* Functions similarly to ossl_quic_wire_encode_frame_stream_hdr, but it also
* allocates space for f->len bytes of data after the header, creating a
* well-formed QUIC STREAM frame in one call.
*
* A pointer to the bytes allocated for the framme payload is returned,
* which the caller can fill however it wishes. If f->data is non-NULL,
* it is automatically copied to the target buffer, otherwise the caller
* must fill the returned buffer. Returns NULL on failure.
*/
void *ossl_quic_wire_encode_frame_stream(WPACKET *pkt,
const OSSL_QUIC_FRAME_STREAM *f);
/*
* Encodes a QUIC MAX_DATA frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_max_data(WPACKET *pkt,
uint64_t max_data);
/*
* Encodes a QUIC MAX_STREAM_DATA frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_max_stream_data(WPACKET *pkt,
uint64_t stream_id,
uint64_t max_data);
/*
* Encodes a QUIC MAX_STREAMS frame to the packet writer.
*
* If is_uni is 0, the count specifies the maximum number of
* bidirectional streams; else it specifies the maximum number of unidirectional
* streams.
*/
int ossl_quic_wire_encode_frame_max_streams(WPACKET *pkt,
char is_uni,
uint64_t max_streams);
/*
* Encodes a QUIC DATA_BLOCKED frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_data_blocked(WPACKET *pkt,
uint64_t max_data);
/*
* Encodes a QUIC STREAM_DATA_BLOCKED frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_stream_data_blocked(WPACKET *pkt,
uint64_t stream_id,
uint64_t max_stream_data);
/*
* Encodes a QUIC STREAMS_BLOCKED frame to the packet writer.
*
* If is_uni is 0, the count specifies the maximum number of
* bidirectional streams; else it specifies the maximum number of unidirectional
* streams.
*/
int ossl_quic_wire_encode_frame_streams_blocked(WPACKET *pkt,
char is_uni,
uint64_t max_streams);
/*
* Encodes a QUIC NEW_CONNECTION_ID frame to the packet writer, given a logical
* representation of the NEW_CONNECTION_ID frame.
*
* The buffer pointed to by the conn_id field must be valid for the duration of
* the call.
*/
int ossl_quic_wire_encode_frame_new_conn_id(WPACKET *pkt,
const OSSL_QUIC_FRAME_NEW_CONN_ID *f);
/*
* Encodes a QUIC RETIRE_CONNECTION_ID frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_retire_conn_id(WPACKET *pkt,
uint64_t seq_num);
/*
* Encodes a QUIC PATH_CHALLENGE frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_path_challenge(WPACKET *pkt,
uint64_t data);
/*
* Encodes a QUIC PATH_RESPONSE frame to the packet writer.
*/
int ossl_quic_wire_encode_frame_path_response(WPACKET *pkt,
uint64_t data);
/*
* Encodes a QUIC CONNECTION_CLOSE frame to the packet writer, given a logical
* representation of the CONNECTION_CLOSE frame.
*
* The reason field may be NULL, in which case no reason is encoded. If the
* reason field is non-NULL, it must point to a valid UTF-8 string and
* reason_len must be set to the length of the reason string in bytes. The
* reason string need not be zero terminated.
*/
int ossl_quic_wire_encode_frame_conn_close(WPACKET *pkt,
const OSSL_QUIC_FRAME_CONN_CLOSE *f);
/*
* Encodes a QUIC HANDSHAKE_DONE frame to the packet writer. This frame type
* takes no arguiments.
*/
int ossl_quic_wire_encode_frame_handshake_done(WPACKET *pkt);
/*
* Encodes a QUIC transport parameter TLV with the given ID into the WPACKET.
* The payload is an arbitrary buffer.
*
* If value is non-NULL, the value is copied into the packet.
* If it is NULL, value_len bytes are allocated for the payload and the caller
* should fill the buffer using the returned pointer.
*
* Returns a pointer to the start of the payload on success, or NULL on failure.
*/
unsigned char *ossl_quic_wire_encode_transport_param_bytes(WPACKET *pkt,
uint64_t id,
const unsigned char *value,
size_t value_len);
/*
* Encodes a QUIC transport parameter TLV with the given ID into the WPACKET.
* The payload is a QUIC variable-length integer with the given value.
*/
int ossl_quic_wire_encode_transport_param_int(WPACKET *pkt,
uint64_t id,
uint64_t value);
/*
* Encodes a QUIC transport parameter TLV with a given ID into the WPACKET.
* The payload is a QUIC connection ID.
*/
int ossl_quic_wire_encode_transport_param_cid(WPACKET *wpkt,
uint64_t id,
const QUIC_CONN_ID *cid);
/*
* QUIC Wire Format Decoding
* =========================
*
* These functions return 1 on success or 0 for failure. Typical reasons
* why these functions may fail include:
*
* - A frame decode function is called but the frame in the PACKET's buffer
* is not of the correct type.
*
* - A variable-length field in the encoded frame appears to exceed the bounds
* of the PACKET's buffer.
*
* These functions should be called with the PACKET pointing to the start of the
* frame (including the initial type field), and consume an entire frame
* including its type field. The expectation is that the caller will have
* already discerned the frame type using ossl_quic_wire_peek_frame_header().
*/
/*
* Decodes the type field header of a QUIC frame (without advancing the current
* position). This can be used to determine the frame type and determine which
* frame decoding function to call.
*/
int ossl_quic_wire_peek_frame_header(PACKET *pkt, uint64_t *type);
/*
* Like ossl_quic_wire_peek_frame_header, but advances the current position
* so that the type field is consumed. For advanced use only.
*/
int ossl_quic_wire_skip_frame_header(PACKET *pkt, uint64_t *type);
/*
* Determines how many ranges are needed to decode a QUIC ACK frame.
*
* The number of ranges which must be allocated before the call to
* ossl_quic_wire_decode_frame_ack is written to *total_ranges.
*
* The PACKET is not advanced.
*/
int ossl_quic_wire_peek_frame_ack_num_ranges(const PACKET *pkt,
uint64_t *total_ranges);
/*
* Decodes a QUIC ACK frame. The ack_ranges field of the passed structure should
* point to a preallocated array of ACK ranges and the num_ack_ranges field
* should specify the length of allocation.
*
* *total_ranges is written with the number of ranges in the decoded frame,
* which may be greater than the number of ranges which were decoded (i.e. if
* num_ack_ranges was too small to decode all ranges).
*
* On success, this function modifies the num_ack_ranges field to indicate the
* number of ranges in the decoded frame. This is the number of entries in the
* ACK ranges array written by this function; any additional entries are not
* modified.
*
* If the number of ACK ranges in the decoded frame exceeds that in
* num_ack_ranges, as many ACK ranges as possible are decoded into the range
* array. The caller can use the value written to *total_ranges to detect this
* condition, as *total_ranges will exceed num_ack_ranges.
*
* If ack is NULL, the frame is still decoded, but only *total_ranges is
* written. This can be used to determine the number of ranges which must be
* allocated.
*
* The ack_delay_exponent argument specifies the index of a power of two used to
* decode the ack_delay field. This must match the ack_delay_exponent value used
* to encode the frame.
*/
int ossl_quic_wire_decode_frame_ack(PACKET *pkt,
uint32_t ack_delay_exponent,
OSSL_QUIC_FRAME_ACK *ack,
uint64_t *total_ranges);
/*
* Decodes a QUIC RESET_STREAM frame.
*/
int ossl_quic_wire_decode_frame_reset_stream(PACKET *pkt,
OSSL_QUIC_FRAME_RESET_STREAM *f);
/*
* Decodes a QUIC STOP_SENDING frame.
*/
int ossl_quic_wire_decode_frame_stop_sending(PACKET *pkt,
OSSL_QUIC_FRAME_STOP_SENDING *f);
/*
* Decodes a QUIC CRYPTO frame.
*
* f->data is set to point inside the packet buffer inside the PACKET, therefore
* it is safe to access for as long as the packet buffer exists. If nodata is
* set to 1 then reading the PACKET stops after the frame header and f->data is
* set to NULL.
*/
int ossl_quic_wire_decode_frame_crypto(PACKET *pkt, int nodata,
OSSL_QUIC_FRAME_CRYPTO *f);
/*
* Decodes a QUIC NEW_TOKEN frame. *token is written with a pointer to the token
* bytes and *token_len is written with the length of the token in bytes.
*/
int ossl_quic_wire_decode_frame_new_token(PACKET *pkt,
const unsigned char **token,
size_t *token_len);
/*
* Decodes a QUIC STREAM frame.
*
* If nodata is set to 1 then reading the PACKET stops after the frame header
* and f->data is set to NULL. In this case f->len will also be 0 in the event
* that "has_explicit_len" is 0.
*
* If the frame did not contain an offset field, f->offset is set to 0, as the
* absence of an offset field is equivalent to an offset of 0.
*
* If the frame contained a length field, f->has_explicit_len is set to 1 and
* the length of the data is placed in f->len. This function ensures that the
* length does not exceed the packet buffer, thus it is safe to access f->data.
*
* If the frame did not contain a length field, this means that the frame runs
* until the end of the packet. This function sets f->has_explicit_len to zero,
* and f->len to the amount of data remaining in the input buffer. Therefore,
* this function should be used with a PACKET representing a single packet (and
* not e.g. multiple packets).
*
* Note also that this means f->len is always valid after this function returns
* successfully, regardless of the value of f->has_explicit_len.
*
* f->data points inside the packet buffer inside the PACKET, therefore it is
* safe to access for as long as the packet buffer exists.
*
* f->is_fin is set according to whether the frame was marked as ending the
* stream.
*/
int ossl_quic_wire_decode_frame_stream(PACKET *pkt, int nodata,
OSSL_QUIC_FRAME_STREAM *f);
/*
* Decodes a QUIC MAX_DATA frame. The Maximum Data field is written to
* *max_data.
*/
int ossl_quic_wire_decode_frame_max_data(PACKET *pkt,
uint64_t *max_data);
/*
* Decodes a QUIC MAX_STREAM_DATA frame. The Stream ID is written to *stream_id
* and Maximum Stream Data field is written to *max_stream_data.
*/
int ossl_quic_wire_decode_frame_max_stream_data(PACKET *pkt,
uint64_t *stream_id,
uint64_t *max_stream_data);
/*
* Decodes a QUIC MAX_STREAMS frame. The Maximum Streams field is written to
* *max_streams.
*
* Whether the limit concerns bidirectional streams or unidirectional streams is
* denoted by the frame type; the caller should examine the frame type to
* determine this.
*/
int ossl_quic_wire_decode_frame_max_streams(PACKET *pkt,
uint64_t *max_streams);
/*
* Decodes a QUIC DATA_BLOCKED frame. The Maximum Data field is written to
* *max_data.
*/
int ossl_quic_wire_decode_frame_data_blocked(PACKET *pkt,
uint64_t *max_data);
/*
* Decodes a QUIC STREAM_DATA_BLOCKED frame. The Stream ID and Maximum Stream
* Data fields are written to *stream_id and *max_stream_data respectively.
*/
int ossl_quic_wire_decode_frame_stream_data_blocked(PACKET *pkt,
uint64_t *stream_id,
uint64_t *max_stream_data);
/*
* Decodes a QUIC STREAMS_BLOCKED frame. The Maximum Streams field is written to
* *max_streams.
*
* Whether the limit concerns bidirectional streams or unidirectional streams is
* denoted by the frame type; the caller should examine the frame type to
* determine this.
*/
int ossl_quic_wire_decode_frame_streams_blocked(PACKET *pkt,
uint64_t *max_streams);
/*
* Decodes a QUIC NEW_CONNECTION_ID frame. The logical representation of the
* frame is written to *f.
*
* The conn_id field is set to point to the connection ID string inside the
* packet buffer; it is therefore valid for as long as the PACKET's buffer is
* valid. The conn_id_len field is set to the length of the connection ID string
* in bytes.
*/
int ossl_quic_wire_decode_frame_new_conn_id(PACKET *pkt,
OSSL_QUIC_FRAME_NEW_CONN_ID *f);
/*
* Decodes a QUIC RETIRE_CONNECTION_ID frame. The Sequence Number field
* is written to *seq_num.
*/
int ossl_quic_wire_decode_frame_retire_conn_id(PACKET *pkt,
uint64_t *seq_num);
/*
* Decodes a QUIC PATH_CHALLENGE frame. The Data field is written to *data.
*/
int ossl_quic_wire_decode_frame_path_challenge(PACKET *pkt,
uint64_t *data);
/*
* Decodes a QUIC PATH_CHALLENGE frame. The Data field is written to *data.
*/
int ossl_quic_wire_decode_frame_path_response(PACKET *pkt,
uint64_t *data);
/*
* Decodes a QUIC CONNECTION_CLOSE frame. The logical representation
* of the frame is written to *f.
*
* The reason field is set to point to the UTF-8 reason string inside
* the packet buffer; it is therefore valid for as long as the PACKET's
* buffer is valid. The reason_len field is set to the length of the
* reason string in bytes.
*
* IMPORTANT: The reason string is not zero-terminated.
*
* Returns 1 on success or 0 on failure.
*/
int ossl_quic_wire_decode_frame_conn_close(PACKET *pkt,
OSSL_QUIC_FRAME_CONN_CLOSE *f);
/*
* Decodes one or more PADDING frames. PADDING frames have no arguments.
*
* Returns the number of PADDING frames decoded or 0 on error.
*/
size_t ossl_quic_wire_decode_padding(PACKET *pkt);
/*
* Decodes a PING frame. The frame has no arguments.
*/
int ossl_quic_wire_decode_frame_ping(PACKET *pkt);
/*
* Decodes a HANDSHAKE_DONE frame. The frame has no arguments.
*/
int ossl_quic_wire_decode_frame_handshake_done(PACKET *pkt);
/*
* Peeks at the ID of the next QUIC transport parameter TLV in the stream.
* The ID is written to *id.
*/
int ossl_quic_wire_peek_transport_param(PACKET *pkt, uint64_t *id);
/*
* Decodes a QUIC transport parameter TLV. A pointer to the value buffer is
* returned on success. This points inside the PACKET's buffer and is therefore
* valid as long as the PACKET's buffer is valid.
*
* The transport parameter ID is written to *id (if non-NULL) and the length of
* the payload in bytes is written to *len.
*
* Returns NULL on failure.
*/
const unsigned char *ossl_quic_wire_decode_transport_param_bytes(PACKET *pkt,
uint64_t *id,
size_t *len);
/*
* Decodes a QUIC transport parameter TLV containing a variable-length integer.
*
* The transport parameter ID is written to *id (if non-NULL) and the value is
* written to *value.
*/
int ossl_quic_wire_decode_transport_param_int(PACKET *pkt,
uint64_t *id,
uint64_t *value);
/*
* Decodes a QUIC transport parameter TLV containing a connection ID.
*
* The transport parameter ID is written to *id (if non-NULL) and the value is
* written to *value.
*/
int ossl_quic_wire_decode_transport_param_cid(PACKET *pkt,
uint64_t *id,
QUIC_CONN_ID *cid);
# endif
#endif
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