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/* * Copyright (c) 2012-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file circuitmux.h
* \brief Header file for circuitmux.c
**/
#ifndef TOR_CIRCUITMUX_H
#define TOR_CIRCUITMUX_H
#include "core/or/or.h"
#include "lib/testsupport/testsupport.h"
typedef struct circuitmux_policy_t circuitmux_policy_t;
typedef struct circuitmux_policy_data_t circuitmux_policy_data_t;
typedef struct circuitmux_policy_circ_data_t circuitmux_policy_circ_data_t;
struct circuitmux_policy_t {
/* Allocate cmux-wide policy-specific data */
circuitmux_policy_data_t * (*alloc_cmux_data)(circuitmux_t *cmux);
/* Free cmux-wide policy-specific data */
void (*free_cmux_data)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data);
/* Allocate circuit policy-specific data for a newly attached circuit */
circuitmux_policy_circ_data_t *
(*alloc_circ_data)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
cell_direction_t direction,
unsigned int cell_count);
/* Free circuit policy-specific data */
void (*free_circ_data)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
circuitmux_policy_circ_data_t *pol_circ_data);
/* Notify that a circuit has become active/inactive */
void (*notify_circ_active)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
circuitmux_policy_circ_data_t *pol_circ_data);
void (*notify_circ_inactive)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
circuitmux_policy_circ_data_t *pol_circ_data);
/* Notify of arriving/transmitted cells on a circuit */
void (*notify_set_n_cells)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
circuitmux_policy_circ_data_t *pol_circ_data,
unsigned int n_cells);
void (*notify_xmit_cells)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data,
circuit_t *circ,
circuitmux_policy_circ_data_t *pol_circ_data,
unsigned int n_cells);
/* Choose a circuit */
circuit_t * (*pick_active_circuit)(circuitmux_t *cmux,
circuitmux_policy_data_t *pol_data);
/* Optional: channel comparator for use by the scheduler */
int (*cmp_cmux)(circuitmux_t *cmux_1, circuitmux_policy_data_t *pol_data_1,
circuitmux_t *cmux_2, circuitmux_policy_data_t *pol_data_2);
};
/*
* Circuitmux policy implementations can subclass this to store circuitmux-
* wide data; it just has the magic number in the base struct.
*/
struct circuitmux_policy_data_t {
uint32_t magic;
};
/*
* Circuitmux policy implementations can subclass this to store circuit-
* specific data; it just has the magic number in the base struct.
*/
struct circuitmux_policy_circ_data_t {
uint32_t magic;
};
/*
* Upcast #defines for the above types
*/
/**
* Convert a circuitmux_policy_data_t subtype to a circuitmux_policy_data_t.
*/
#define TO_CMUX_POL_DATA(x) (&((x)->base_))
/**
* Convert a circuitmux_policy_circ_data_t subtype to a
* circuitmux_policy_circ_data_t.
*/
#define TO_CMUX_POL_CIRC_DATA(x) (&((x)->base_))
/* Consistency check */
void circuitmux_assert_okay(circuitmux_t *cmux);
/* Create/destroy */
circuitmux_t * circuitmux_alloc(void);
void circuitmux_detach_all_circuits(circuitmux_t *cmux,
smartlist_t *detached_out);
void circuitmux_free_(circuitmux_t *cmux);
#define circuitmux_free(cmux) \
FREE_AND_NULL(circuitmux_t, circuitmux_free_, (cmux))
/* Policy control */
void circuitmux_clear_policy(circuitmux_t *cmux);
MOCK_DECL(const circuitmux_policy_t *,
circuitmux_get_policy, (circuitmux_t *cmux));
void circuitmux_set_policy(circuitmux_t *cmux,
const circuitmux_policy_t *pol);
/* Status inquiries */
cell_direction_t circuitmux_attached_circuit_direction(
circuitmux_t *cmux,
circuit_t *circ);
int circuitmux_is_circuit_attached(circuitmux_t *cmux, circuit_t *circ);
int circuitmux_is_circuit_active(circuitmux_t *cmux, circuit_t *circ);
unsigned int circuitmux_num_cells_for_circuit(circuitmux_t *cmux,
circuit_t *circ);
MOCK_DECL(unsigned int, circuitmux_num_cells, (circuitmux_t *cmux));
unsigned int circuitmux_num_circuits(circuitmux_t *cmux);
unsigned int circuitmux_num_active_circuits(circuitmux_t *cmux);
/* Debuging interface - slow. */
int64_t circuitmux_count_queued_destroy_cells(const channel_t *chan,
const circuitmux_t *cmux);
/* Channel interface */
circuit_t * circuitmux_get_first_active_circuit(circuitmux_t *cmux,
destroy_cell_queue_t **destroy_queue_out);
void circuitmux_notify_xmit_cells(circuitmux_t *cmux, circuit_t *circ,
unsigned int n_cells);
void circuitmux_notify_xmit_destroy(circuitmux_t *cmux);
/* Circuit interface */
MOCK_DECL(void, circuitmux_attach_circuit, (circuitmux_t *cmux,
circuit_t *circ,
cell_direction_t direction));
MOCK_DECL(void, circuitmux_detach_circuit,
(circuitmux_t *cmux, circuit_t *circ));
void circuitmux_clear_num_cells(circuitmux_t *cmux, circuit_t *circ);
void circuitmux_set_num_cells(circuitmux_t *cmux, circuit_t *circ,
unsigned int n_cells);
void circuitmux_append_destroy_cell(channel_t *chan,
circuitmux_t *cmux, circid_t circ_id,
uint8_t reason);
void circuitmux_mark_destroyed_circids_usable(circuitmux_t *cmux,
channel_t *chan);
/* Optional interchannel comparisons for scheduling */
MOCK_DECL(int, circuitmux_compare_muxes,
(circuitmux_t *cmux_1, circuitmux_t *cmux_2));
#ifdef CIRCUITMUX_PRIVATE
#include "core/or/destroy_cell_queue_st.h"
/*
* Map of muxinfos for circuitmux_t to use; struct is defined below (name
* of struct must match HT_HEAD line).
*/
typedef HT_HEAD(chanid_circid_muxinfo_map, chanid_circid_muxinfo_t)
chanid_circid_muxinfo_map_t;
/*
* Structures for circuitmux.c
*/
struct circuitmux_t {
/* Keep count of attached, active circuits */
unsigned int n_circuits, n_active_circuits;
/* Total number of queued cells on all circuits */
unsigned int n_cells;
/*
* Map from (channel ID, circuit ID) pairs to circuit_muxinfo_t
*/
chanid_circid_muxinfo_map_t *chanid_circid_map;
/** List of queued destroy cells */
destroy_cell_queue_t destroy_cell_queue;
/** Boolean: True iff the last cell to circuitmux_get_first_active_circuit
* returned the destroy queue. Used to force alternation between
* destroy/non-destroy cells.
*
* XXXX There is no reason to think that alternating is a particularly good
* approach -- it's just designed to prevent destroys from starving other
* cells completely.
*/
unsigned int last_cell_was_destroy : 1;
/** Destroy counter: increment this when a destroy gets queued, decrement
* when we unqueue it, so we can test to make sure they don't starve.
*/
int64_t destroy_ctr;
/*
* Circuitmux policy; if this is non-NULL, it can override the built-
* in round-robin active circuits behavior. This is how EWMA works in
* the new circuitmux_t world.
*/
const circuitmux_policy_t *policy;
/* Policy-specific data */
circuitmux_policy_data_t *policy_data;
};
#endif /* defined(CIRCUITMUX_PRIVATE) */
#endif /* !defined(TOR_CIRCUITMUX_H) */
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