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/*
* ngtcp2
*
* Copyright (c) 2018 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_CID_H
#define NGTCP2_CID_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* defined(HAVE_CONFIG_H) */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_pq.h"
#include "ngtcp2_path.h"
/* NGTCP2_SCID_FLAG_NONE indicates that no flag is set. */
#define NGTCP2_SCID_FLAG_NONE 0x00u
/* NGTCP2_SCID_FLAG_USED indicates that a local endpoint observed that
a remote endpoint uses this particular Connection ID. */
#define NGTCP2_SCID_FLAG_USED 0x01u
/* NGTCP2_SCID_FLAG_RETIRED indicates that this particular Connection
ID is retired. */
#define NGTCP2_SCID_FLAG_RETIRED 0x02u
typedef struct ngtcp2_scid {
ngtcp2_pq_entry pe;
/* seq is the sequence number associated to the Connection ID. */
uint64_t seq;
/* cid is a connection ID */
ngtcp2_cid cid;
/* retired_ts is the timestamp when a remote endpoint tells that
this Connection ID is retired. */
ngtcp2_tstamp retired_ts;
/* flags is the bitwise OR of zero or more of NGTCP2_SCID_FLAG_*. */
uint8_t flags;
} ngtcp2_scid;
/* NGTCP2_DCID_FLAG_NONE indicates that no flag is set. */
#define NGTCP2_DCID_FLAG_NONE 0x00u
/* NGTCP2_DCID_FLAG_PATH_VALIDATED indicates that an associated path
has been validated. */
#define NGTCP2_DCID_FLAG_PATH_VALIDATED 0x01u
/* NGTCP2_DCID_FLAG_TOKEN_PRESENT indicates that a stateless reset
token is set in token field. */
#define NGTCP2_DCID_FLAG_TOKEN_PRESENT 0x02u
typedef struct ngtcp2_dcid {
/* seq is the sequence number associated to the Connection ID. */
uint64_t seq;
/* cid is a Connection ID */
ngtcp2_cid cid;
/* path is a path which cid is bound to. The addresses are zero
length if cid has not been bound to a particular path yet. */
ngtcp2_path_storage ps;
/* retired_ts is the timestamp when this Connection ID is
retired. */
ngtcp2_tstamp retired_ts;
/* bound_ts is the timestamp when this Connection ID is bound to a
particular path. It is only assigned when a Connection ID is
used just for sending PATH_RESPONSE, and is not zero-length. */
ngtcp2_tstamp bound_ts;
/* bytes_sent is the number of bytes sent to an associated path. */
uint64_t bytes_sent;
/* bytes_recv is the number of bytes received from an associated
path. */
uint64_t bytes_recv;
/* max_udp_payload_size is the maximum size of UDP datagram payload
that is allowed to be sent to this path. */
size_t max_udp_payload_size;
/* flags is bitwise OR of zero or more of NGTCP2_DCID_FLAG_*. */
uint8_t flags;
/* token is a stateless reset token received along with this
Connection ID. The stateless reset token is tied to the
connection, not to the particular Connection ID. */
uint8_t token[NGTCP2_STATELESS_RESET_TOKENLEN];
} ngtcp2_dcid;
/* ngtcp2_cid_zero makes |cid| zero-length. */
void ngtcp2_cid_zero(ngtcp2_cid *cid);
/*
* ngtcp2_cid_less returns nonzero if |lhs| is lexicographical smaller
* than |rhs|.
*/
int ngtcp2_cid_less(const ngtcp2_cid *lhs, const ngtcp2_cid *rhs);
/*
* ngtcp2_cid_empty returns nonzero if |cid| includes empty Connection
* ID.
*/
int ngtcp2_cid_empty(const ngtcp2_cid *cid);
/*
* ngtcp2_scid_init initializes |scid| with the given parameters.
*/
void ngtcp2_scid_init(ngtcp2_scid *scid, uint64_t seq, const ngtcp2_cid *cid);
/*
* ngtcp2_scid_copy copies |src| into |dest|.
*/
void ngtcp2_scid_copy(ngtcp2_scid *dest, const ngtcp2_scid *src);
/*
* ngtcp2_dcid_init initializes |dcid| with the given parameters. If
* |token| is NULL, the function fills dcid->token with 0. |token|
* must be NGTCP2_STATELESS_RESET_TOKENLEN bytes long.
*/
void ngtcp2_dcid_init(ngtcp2_dcid *dcid, uint64_t seq, const ngtcp2_cid *cid,
const uint8_t *token);
/*
* ngtcp2_dcid_set_token sets |token| to |dcid|. |token| must not be
* NULL, and must be NGTCP2_STATELESS_RESET_TOKENLEN bytes long.
*/
void ngtcp2_dcid_set_token(ngtcp2_dcid *dcid, const uint8_t *token);
/*
* ngtcp2_dcid_set_path sets |path| to |dcid|. It sets
* max_udp_payload_size to the minimum UDP datagram payload size
* supported by the IP protocol version.
*/
void ngtcp2_dcid_set_path(ngtcp2_dcid *dcid, const ngtcp2_path *path);
/*
* ngtcp2_dcid_copy copies |src| into |dest|.
*/
void ngtcp2_dcid_copy(ngtcp2_dcid *dest, const ngtcp2_dcid *src);
/*
* ngtcp2_dcid_copy_cid_token behaves like ngtcp2_dcid_copy, but it
* only copies cid, seq, and token.
*/
void ngtcp2_dcid_copy_cid_token(ngtcp2_dcid *dest, const ngtcp2_dcid *src);
/*
* ngtcp2_dcid_verify_uniqueness verifies uniqueness of (|seq|, |cid|,
* |token|) tuple against |dcid|.
*/
int ngtcp2_dcid_verify_uniqueness(const ngtcp2_dcid *dcid, uint64_t seq,
const ngtcp2_cid *cid, const uint8_t *token);
/*
* ngtcp2_dcid_verify_stateless_reset_token verifies stateless reset
* token |token| against the one included in |dcid|. Tokens are
* compared in constant time. This function returns 0 if the
* verification succeeds, or one of the following negative error
* codes:
*
* NGTCP2_ERR_INVALID_ARGUMENT
* Tokens do not match; or |dcid| does not contain a token.
*/
int ngtcp2_dcid_verify_stateless_reset_token(const ngtcp2_dcid *dcid,
const uint8_t *token);
#endif /* !defined(NGTCP2_CID_H) */
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