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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 relay.h
* \brief Header file for relay.c.
**/
#ifndef TOR_RELAY_H
#define TOR_RELAY_H
extern uint64_t stats_n_relay_cells_relayed;
extern uint64_t stats_n_relay_cells_delivered;
extern uint64_t stats_n_circ_max_cell_reached;
void relay_consensus_has_changed(const networkstatus_t *ns);
int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
cell_direction_t cell_direction);
size_t cell_queues_get_total_allocation(void);
void relay_header_pack(uint8_t *dest, const relay_header_t *src);
void relay_header_unpack(relay_header_t *dest, const uint8_t *src);
MOCK_DECL(int,
relay_send_command_from_edge_,(streamid_t stream_id, circuit_t *circ,
uint8_t relay_command, const char *payload,
size_t payload_len, crypt_path_t *cpath_layer,
const char *filename, int lineno));
/* Indicates to relay_send_command_from_edge() that it is a control cell. */
#define CONTROL_CELL_ID 0
#define relay_send_command_from_edge(stream_id, circ, relay_command, payload, \
payload_len, cpath_layer) \
relay_send_command_from_edge_((stream_id), (circ), (relay_command), \
(payload), (payload_len), (cpath_layer), \
__FILE__, __LINE__)
int connection_edge_send_command(edge_connection_t *fromconn,
uint8_t relay_command, const char *payload,
size_t payload_len);
int connection_edge_package_raw_inbuf(edge_connection_t *conn,
int package_partial,
int *max_cells);
void connection_edge_consider_sending_sendme(edge_connection_t *conn);
void circuit_reset_sendme_randomness(circuit_t *circ);
extern uint64_t stats_n_data_cells_packaged;
extern uint64_t stats_n_data_bytes_packaged;
extern uint64_t stats_n_data_cells_received;
extern uint64_t stats_n_data_bytes_received;
void dump_cell_pool_usage(int severity);
size_t packed_cell_mem_cost(void);
int have_been_under_memory_pressure(void);
/* For channeltls.c */
void packed_cell_free_(packed_cell_t *cell);
#define packed_cell_free(cell) \
FREE_AND_NULL(packed_cell_t, packed_cell_free_, (cell))
void cell_queue_init(cell_queue_t *queue);
void cell_queue_clear(cell_queue_t *queue);
void cell_queue_append(cell_queue_t *queue, packed_cell_t *cell);
void cell_queue_append_packed_copy(circuit_t *circ, cell_queue_t *queue,
int exitward, const cell_t *cell,
int wide_circ_ids, int use_stats);
void append_cell_to_circuit_queue(circuit_t *circ, channel_t *chan,
cell_t *cell, cell_direction_t direction,
streamid_t fromstream);
void destroy_cell_queue_init(destroy_cell_queue_t *queue);
void destroy_cell_queue_clear(destroy_cell_queue_t *queue);
void destroy_cell_queue_append(destroy_cell_queue_t *queue,
circid_t circid,
uint8_t reason);
void channel_unlink_all_circuits(channel_t *chan, smartlist_t *detached_out);
MOCK_DECL(int, channel_flush_from_first_active_circuit,
(channel_t *chan, int max));
MOCK_DECL(int, circuit_package_relay_cell, (cell_t *cell, circuit_t *circ,
cell_direction_t cell_direction,
crypt_path_t *layer_hint, streamid_t on_stream,
const char *filename, int lineno));
void update_circuit_on_cmux_(circuit_t *circ, cell_direction_t direction,
const char *file, int lineno);
#define update_circuit_on_cmux(circ, direction) \
update_circuit_on_cmux_((circ), (direction), SHORT_FILE__, __LINE__)
int append_address_to_payload(uint8_t *payload_out, const tor_addr_t *addr);
const uint8_t *decode_address_from_payload(tor_addr_t *addr_out,
const uint8_t *payload,
int payload_len);
void circuit_clear_cell_queue(circuit_t *circ, channel_t *chan);
circid_t packed_cell_get_circid(const packed_cell_t *cell, int wide_circ_ids);
uint8_t packed_cell_get_command(const packed_cell_t *cell, int wide_circ_ids);
#ifdef RELAY_PRIVATE
STATIC int
handle_relay_cell_command(cell_t *cell, circuit_t *circ,
edge_connection_t *conn, crypt_path_t *layer_hint,
relay_header_t *rh, int optimistic_data);
STATIC int connected_cell_parse(const relay_header_t *rh, const cell_t *cell,
tor_addr_t *addr_out, int *ttl_out);
/** An address-and-ttl tuple as yielded by resolved_cell_parse */
typedef struct address_ttl_t {
tor_addr_t addr;
char *hostname;
int ttl;
} address_ttl_t;
STATIC void address_ttl_free_(address_ttl_t *addr);
#define address_ttl_free(addr) \
FREE_AND_NULL(address_ttl_t, address_ttl_free_, (addr))
STATIC int resolved_cell_parse(const cell_t *cell, const relay_header_t *rh,
smartlist_t *addresses_out, int *errcode_out);
STATIC int connection_edge_process_resolved_cell(edge_connection_t *conn,
const cell_t *cell,
const relay_header_t *rh);
STATIC packed_cell_t *packed_cell_new(void);
STATIC packed_cell_t *cell_queue_pop(cell_queue_t *queue);
STATIC destroy_cell_t *destroy_cell_queue_pop(destroy_cell_queue_t *queue);
STATIC int cell_queues_check_size(void);
STATIC int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
edge_connection_t *conn,
crypt_path_t *layer_hint);
STATIC size_t get_pad_cell_offset(size_t payload_len);
STATIC size_t connection_edge_get_inbuf_bytes_to_package(size_t n_available,
int package_partial,
circuit_t *on_circuit);
#endif /* defined(RELAY_PRIVATE) */
#endif /* !defined(TOR_RELAY_H) */
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