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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) 2007-2018, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- #ifndef OR_CIRCUIT_ST_H
- #define OR_CIRCUIT_ST_H
- #include "core/or/or.h"
- #include "core/or/circuit_st.h"
- #include "core/or/crypt_path_st.h"
- struct onion_queue_t;
- /** An or_circuit_t holds information needed to implement a circuit at an
- * OR. */
- struct or_circuit_t {
- circuit_t base_;
- /** Pointer to an entry on the onion queue, if this circuit is waiting for a
- * chance to give an onionskin to a cpuworker. Used only in onion.c */
- struct onion_queue_t *onionqueue_entry;
- /** Pointer to a workqueue entry, if this circuit has given an onionskin to
- * a cpuworker and is waiting for a response. Used to decide whether it is
- * safe to free a circuit or if it is still in use by a cpuworker. */
- struct workqueue_entry_s *workqueue_entry;
- /** The circuit_id used in the previous (backward) hop of this circuit. */
- circid_t p_circ_id;
- /** Queue of cells waiting to be transmitted on p_conn. */
- cell_queue_t p_chan_cells;
- /** The channel that is previous in this circuit. */
- channel_t *p_chan;
- /**
- * Circuit mux associated with p_chan to which this circuit is attached;
- * NULL if we have no p_chan.
- */
- circuitmux_t *p_mux;
- /** Linked list of Exit streams associated with this circuit. */
- edge_connection_t *n_streams;
- /** Linked list of Exit streams associated with this circuit that are
- * still being resolved. */
- edge_connection_t *resolving_streams;
- /** Cryptographic state used for encrypting and authenticating relay
- * cells to and from this hop. */
- relay_crypto_t crypto;
- /** Points to spliced circuit if purpose is REND_ESTABLISHED, and circuit
- * is not marked for close. */
- struct or_circuit_t *rend_splice;
- /** Stores KH for the handshake. */
- char rend_circ_nonce[DIGEST_LEN];/* KH in tor-spec.txt */
- /** How many more relay_early cells can we send on this circuit, according
- * to the specification? */
- unsigned int remaining_relay_early_cells : 4;
- /* We have already received an INTRODUCE1 cell on this circuit. */
- unsigned int already_received_introduce1 : 1;
- /** If set, this circuit carries HS traffic. Consider it in any HS
- * statistics. */
- unsigned int circuit_carries_hs_traffic_stats : 1;
- /** Number of cells that were removed from circuit queue; reset every
- * time when writing buffer stats to disk. */
- uint32_t processed_cells;
- /** Total time in milliseconds that cells spent in both app-ward and
- * exit-ward queues of this circuit; reset every time when writing
- * buffer stats to disk. */
- uint64_t total_cell_waiting_time;
- };
- #endif
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