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diff --git a/src/cadet/gnunet-service-cadet_connection.h b/src/cadet/gnunet-service-cadet_connection.h
deleted file mode 100644
index d646b3dc2..000000000
--- a/src/cadet/gnunet-service-cadet_connection.h
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
-     This file is part of GNUnet.
-     Copyright (C) 2001-2017 GNUnet e.V.
-
-     GNUnet is free software: you can redistribute it and/or modify it
-     under the terms of the GNU Affero General Public License as published
-     by the Free Software Foundation, either version 3 of the License,
-     or (at your option) any later version.
-
-     GNUnet is distributed in the hope that it will be useful, but
-     WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     Affero General Public License for more details.
-
-     You should have received a copy of the GNU Affero General Public License
-     along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-     SPDX-License-Identifier: AGPL3.0-or-later
- */
-
-/**
- * @file cadet/gnunet-service-cadet_connection.h
- * @brief A connection is a live end-to-end messaging mechanism
- *       where the peers are identified by a path and know how
- *       to forward along the route using a connection identifier
- *       for routing the data.
- * @author Bartlomiej Polot
- * @author Christian Grothoff
- */
-#ifndef GNUNET_SERVICE_CADET_CONNECTION_H
-#define GNUNET_SERVICE_CADET_CONNECTION_H
-
-#include "gnunet_util_lib.h"
-#include "gnunet-service-cadet.h"
-#include "gnunet-service-cadet_peer.h"
-#include "cadet_protocol.h"
-
-
-/**
- * Function called to notify tunnel about change in our readiness.
- *
- * @param cls closure
- * @param is_ready #GNUNET_YES if the connection is now ready for transmission,
- *                 #GNUNET_NO if the connection is no longer ready for transmission
- */
-typedef void
-(*GCC_ReadyCallback)(void *cls,
-                     int is_ready);
-
-
-/**
- * Destroy a connection, called when the CORE layer is already done
- * (i.e. has received a BROKEN message), but if we still have to
- * communicate the destruction of the connection to the tunnel (if one
- * exists).
- *
- * @param cc connection to destroy
- */
-void
-GCC_destroy_without_core (struct CadetConnection *cc);
-
-
-/**
- * Destroy a connection, called if the tunnel association with the
- * connection was already broken, but we still need to notify the CORE
- * layer about the breakage.
- *
- * @param cc connection to destroy
- */
-void
-GCC_destroy_without_tunnel (struct CadetConnection *cc);
-
-
-/**
- * Lookup a connection by its identifier.
- *
- * @param cid identifier to resolve
- * @return NULL if connection was not found
- */
-struct CadetConnection *
-GCC_lookup (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid);
-
-
-/**
- * Create a connection to @a destination via @a path and
- * notify @a cb whenever we are ready for more data.
- *
- * @param destination where to go
- * @param path which path to take (may not be the full path)
- * @param off offset of @a destination on @a path
- * @param ct which tunnel uses this connection
- * @param ready_cb function to call when ready to transmit
- * @param ready_cb_cls closure for @a cb
- * @return handle to the connection
- */
-struct CadetConnection *
-GCC_create (struct CadetPeer *destination,
-            struct CadetPeerPath *path,
-            unsigned int off,
-            struct CadetTConnection *ct,
-            GCC_ReadyCallback ready_cb,
-            void *ready_cb_cls);
-
-
-/**
- * Create a connection to @a destination via @a path and
- * notify @a cb whenever we are ready for more data.  This
- * is an inbound tunnel, so we must use the existing @a cid
- *
- * @param destination where to go
- * @param path which path to take (may not be the full path)
- * @param ct which tunnel uses this connection
- * @param ready_cb function to call when ready to transmit
- * @param ready_cb_cls closure for @a cb
- * @return handle to the connection, NULL if we already have
- *         a connection that takes precedence on @a path
- */
-struct CadetConnection *
-GCC_create_inbound (struct CadetPeer *destination,
-                    struct CadetPeerPath *path,
-                    struct CadetTConnection *ct,
-                    const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
-                    GCC_ReadyCallback ready_cb,
-                    void *ready_cb_cls);
-
-
-/**
- * Transmit message @a msg via connection @a cc.  Must only be called
- * (once) after the connection has signalled that it is ready via the
- * `ready_cb`.  Clients can also use #GCC_is_ready() to check if the
- * connection is right now ready for transmission.
- *
- * @param cc connection identification
- * @param env envelope with message to transmit;
- *            the #GNUNET_MQ_notify_send() must not have yet been used
- *            for the envelope.  Also, the message better match the
- *            connection identifier of this connection...
- */
-void
-GCC_transmit (struct CadetConnection *cc,
-              struct GNUNET_MQ_Envelope *env);
-
-
-/**
- * A CREATE_ACK was received for this connection, process it.
- *
- * @param cc the connection that got the ACK.
- */
-void
-GCC_handle_connection_create_ack (struct CadetConnection *cc);
-
-
-/**
- * We got a #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a
- * connection that we already have.  Either our ACK got lost
- * or something is fishy.  Consider retransmitting the ACK.
- *
- * @param cc connection that got the duplicate CREATE
- */
-void
-GCC_handle_duplicate_create (struct CadetConnection *cc);
-
-
-/**
- * Handle KX message.
- *
- * @param cc connection that received encrypted message
- * @param msg the key exchange message
- */
-void
-GCC_handle_kx (struct CadetConnection *cc,
-               const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg);
-
-
-/**
- * Handle KX_AUTH message.
- *
- * @param cc connection that received encrypted message
- * @param msg the key exchange message
- */
-void
-GCC_handle_kx_auth (struct CadetConnection *cc,
-                    const struct
-                    GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg);
-
-/**
- * Purpose for the signature of a monotime.
- */
-struct CadetConnectionCreatePS
-{
-
-  /**
-   * Purpose is #GNUNET_SIGNATURE_PURPOSE_CADET_CONNECTION_INITIATOR
-   */
-  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
-
-  /**
-   * Time at the initiator when generating the signature.
-   *
-   * Note that the receiver MUST IGNORE the absolute time, and only interpret
-   * the value as a mononic time and reject "older" values than the last one
-   * observed.  This is necessary as we do not want to require synchronized
-   * clocks and may not have a bidirectional communication channel.
-   *
-   * Even with this, there is no real guarantee against replay achieved here,
-   * unless the latest timestamp is persisted.  Persistence should be
-   * provided via PEERSTORE if possible.
-   */
-  struct GNUNET_TIME_AbsoluteNBO monotonic_time;
-
-};
-
-/**
- * Performance metrics for a connection.
- */
-struct CadetConnectionMetrics
-{
-  /**
-   * Our current best estimate of the latency, based on a weighted
-   * average of at least @a latency_datapoints values.
-   */
-  struct GNUNET_TIME_Relative aged_latency;
-
-  /**
-   * When was this connection first established? (by us sending or
-   * receiving the CREATE_ACK for the first time)
-   */
-  struct GNUNET_TIME_Absolute age;
-
-  /**
-   * When was this connection last used? (by us sending or
-   * receiving a PAYLOAD message on it)
-   */
-  struct GNUNET_TIME_Absolute last_use;
-
-  /**
-   * How many packets that ought to generate an ACK did we send via
-   * this connection?
-   */
-  unsigned long long num_acked_transmissions;
-
-  /**
-   * Number of packets that were sent via this connection did actually
-   * receive an ACK?  (Note: ACKs may be transmitted and lost via
-   * other connections, so this value should only be interpreted
-   * relative to @e num_acked_transmissions and in relation to other
-   * connections.)
-   */
-  unsigned long long num_successes;
-};
-
-
-/**
- * Obtain performance @a metrics from @a cc.
- *
- * @param cc connection to query
- * @return the metrics
- */
-const struct CadetConnectionMetrics *
-GCC_get_metrics (struct CadetConnection *cc);
-
-
-/**
- * Handle encrypted message.
- *
- * @param cc connection that received encrypted message
- * @param msg the encrypted message to decrypt
- */
-void
-GCC_handle_encrypted (struct CadetConnection *cc,
-                      const struct GNUNET_CADET_TunnelEncryptedMessage *msg);
-
-
-/**
- * We sent a message for which we expect to receive an ACK via
- * the connection identified by @a cti.
- *
- * @param cid connection identifier where we expect an ACK
- */
-void
-GCC_ack_expected (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid);
-
-
-/**
- * We observed an ACK for a message that was originally sent via
- * the connection identified by @a cti.
- *
- * @param cid connection identifier where we got an ACK for a message
- *            that was originally sent via this connection (the ACK
- *            may have gotten back to us via a different connection).
- */
-void
-GCC_ack_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid);
-
-
-/**
- * We observed some the given @a latency on the connection
- * identified by @a cti.  (The same connection was taken
- * in both directions.)
- *
- * @param cti connection identifier where we measured latency
- * @param latency the observed latency
- */
-void
-GCC_latency_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti,
-                      struct GNUNET_TIME_Relative latency);
-
-
-/**
- * Return the tunnel associated with this connection.
- *
- * @param cc connection to query
- * @return corresponding entry in the tunnel's connection list
- */
-struct CadetTConnection *
-GCC_get_ct (struct CadetConnection *cc);
-
-
-/**
- * Obtain the path used by this connection.
- *
- * @param cc connection
- * @param off[out] set to offset in this path where the connection @a cc ends
- * @return path to @a cc
- */
-struct CadetPeerPath *
-GCC_get_path (struct CadetConnection *cc,
-              unsigned int *off);
-
-
-/**
- * Obtain unique ID for the connection.
- *
- * @param cc connection.
- * @return unique number of the connection
- */
-const struct GNUNET_CADET_ConnectionTunnelIdentifier *
-GCC_get_id (struct CadetConnection *cc);
-
-
-/**
- * Get a (static) string for a connection.
- *
- * @param cc Connection.
- */
-const char *
-GCC_2s (const struct CadetConnection *cc);
-
-
-/**
- * Log connection info.
- *
- * @param cc connection
- * @param level Debug level to use.
- */
-void
-GCC_debug (struct CadetConnection *cc,
-           enum GNUNET_ErrorType level);
-
-
-#endif