text: /* Copyright (c) 2001 Matej Pfajfar.
   * Copyright (c) 2001-2004, Roger Dingledine.
   * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   * Copyright (c) 2007-2020, The Tor Project, Inc. */
  /* See LICENSE for licensing information */
  
  /**
   * \file circuitbuild.h
   * \brief Header file for circuitbuild.c.
   **/
  #ifndef TOR_CHANNELPADDING_H
  #define TOR_CHANNELPADDING_H
  
  #include "trunnel/channelpadding_negotiation.h"
  
  #define CHANNELPADDING_SOS_PARAM  "nf_pad_single_onion"
  #define CHANNELPADDING_SOS_DEFAULT 1
  
  typedef enum {
    CHANNELPADDING_WONTPAD,
    CHANNELPADDING_PADLATER,
    CHANNELPADDING_PADDING_SCHEDULED,
    CHANNELPADDING_PADDING_ALREADY_SCHEDULED,
    CHANNELPADDING_PADDING_SENT,
  } channelpadding_decision_t;
  
  channelpadding_decision_t channelpadding_decide_to_pad_channel(channel_t
                                                                 *chan);
  int channelpadding_update_padding_for_channel(channel_t *,
                                                const channelpadding_negotiate_t
                                                *chan);
  
  void channelpadding_disable_padding_on_channel(channel_t *chan);
  void channelpadding_reduce_padding_on_channel(channel_t *chan);
  int channelpadding_send_enable_command(channel_t *chan, uint16_t low_timeout,
                                         uint16_t high_timeout);
  
  int channelpadding_get_circuits_available_timeout(void);
  unsigned int channelpadding_get_channel_idle_timeout(const channel_t *, int);
  void channelpadding_new_consensus_params(networkstatus_t *ns);
  
  #endif /* !defined(TOR_CHANNELPADDING_H) */
  
  