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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file crypt_path_st.h
* @brief Path structures for origin circuits.
**/
#ifndef CRYPT_PATH_ST_H
#define CRYPT_PATH_ST_H
#include "core/or/relay_crypto_st.h"
struct crypto_dh_t;
#define CRYPT_PATH_MAGIC 0x70127012u
struct fast_handshake_state_t;
struct ntor_handshake_state_t;
struct crypto_dh_t;
struct onion_handshake_state_t {
uint16_t tag;
union {
struct fast_handshake_state_t *fast;
struct crypto_dh_t *tap;
struct ntor_handshake_state_t *ntor;
} u;
};
struct congestion_control_t;
/** Macro to encapsulate private members of a struct.
*
* Renames 'x' to 'x_crypt_path_private_field'.
*/
#define CRYPT_PATH_PRIV_FIELD(x) x ## _crypt_path_private_field
#ifdef CRYPT_PATH_PRIVATE
/* Helper macro to access private members of a struct. */
#define pvt_crypto CRYPT_PATH_PRIV_FIELD(crypto)
#endif /* defined(CRYPT_PATH_PRIVATE) */
/** Holds accounting information for a single step in the layered encryption
* performed by a circuit. Used only at the client edge of a circuit. */
struct crypt_path_t {
uint32_t magic;
/** Current state of the handshake as performed with the OR at this
* step. */
onion_handshake_state_t handshake_state;
/** Diffie-hellman handshake state for performing an introduction
* operations */
struct crypto_dh_t *rend_dh_handshake_state;
/** Negotiated key material shared with the OR at this step. */
char rend_circ_nonce[DIGEST_LEN];/* KH in tor-spec.txt */
/** Information to extend to the OR at this step. */
extend_info_t *extend_info;
/** Is the circuit built to this step? Must be one of:
* - CPATH_STATE_CLOSED (The circuit has not been extended to this step)
* - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step
* and not received an EXTENDED/CREATED)
* - CPATH_STATE_OPEN (The circuit has been extended to this step) */
uint8_t state;
#define CPATH_STATE_CLOSED 0
#define CPATH_STATE_AWAITING_KEYS 1
#define CPATH_STATE_OPEN 2
struct crypt_path_t *next; /**< Link to next crypt_path_t in the circuit.
* (The list is circular, so the last node
* links to the first.) */
struct crypt_path_t *prev; /**< Link to previous crypt_path_t in the
* circuit. */
int package_window; /**< How many cells are we allowed to originate ending
* at this step? */
int deliver_window; /**< How many cells are we willing to deliver originating
* at this step? */
/** Congestion control info */
struct congestion_control_t *ccontrol;
/*********************** Private members ****************************/
/** Private member: Cryptographic state used for encrypting and
* authenticating relay cells to and from this hop. */
relay_crypto_t CRYPT_PATH_PRIV_FIELD(crypto);
};
#endif /* !defined(CRYPT_PATH_ST_H) */
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