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diff --git a/src/msg/Connection.h b/src/msg/Connection.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_CONNECTION_H
+#define CEPH_CONNECTION_H
+
+#include <stdlib.h>
+#include <ostream>
+
+#include <boost/intrusive_ptr.hpp>
+
+#include "auth/Auth.h"
+#include "common/RefCountedObj.h"
+#include "common/config.h"
+#include "common/debug.h"
+#include "common/Mutex.h"
+#include "include/ceph_assert.h" // Because intusive_ptr clobbers our assert...
+#include "include/buffer.h"
+#include "include/types.h"
+#include "common/item_history.h"
+#include "msg/MessageRef.h"
+
+
+// ======================================================
+
+// abstract Connection, for keeping per-connection state
+
+class Messenger;
+
+#ifdef UNIT_TESTS_BUILT
+class Interceptor;
+#endif
+
+struct Connection : public RefCountedObject {
+  mutable Mutex lock;
+  Messenger *msgr;
+  RefCountedPtr priv;
+  int peer_type;
+  int64_t peer_id = -1;  // [msgr2 only] the 0 of osd.0, 4567 or client.4567
+  safe_item_history<entity_addrvec_t> peer_addrs;
+  utime_t last_keepalive, last_keepalive_ack;
+private:
+  uint64_t features;
+public:
+  bool failed; // true if we are a lossy connection that has failed.
+
+  int rx_buffers_version;
+  map<ceph_tid_t,pair<bufferlist,int> > rx_buffers;
+
+  // authentication state
+  // FIXME make these private after ms_handle_authorizer is removed
+public:
+  AuthCapsInfo peer_caps_info;
+  EntityName peer_name;
+  uint64_t peer_global_id = 0;
+
+#ifdef UNIT_TESTS_BUILT
+  Interceptor *interceptor;
+#endif
+
+  friend class boost::intrusive_ptr<Connection>;
+  friend class PipeConnection;
+
+public:
+  Connection(CephContext *cct, Messenger *m)
+    // we are managed exclusively by ConnectionRef; make it so you can
+    //   ConnectionRef foo = new Connection;
+    : RefCountedObject(cct, 0),
+      lock("Connection::lock"),
+      msgr(m),
+      peer_type(-1),
+      features(0),
+      failed(false),
+      rx_buffers_version(0) {
+  }
+
+  ~Connection() override {
+    //generic_dout(0) << "~Connection " << this << dendl;
+  }
+
+  void set_priv(const RefCountedPtr& o) {
+    Mutex::Locker l(lock);
+    priv = o;
+  }
+
+  RefCountedPtr get_priv() {
+    Mutex::Locker l(lock);
+    return priv;
+  }
+
+  /**
+   * Used to judge whether this connection is ready to send. Usually, the
+   * implementation need to build a own shakehand or sesson then it can be
+   * ready to send.
+   *
+   * @return true if ready to send, or false otherwise
+   */
+  virtual bool is_connected() = 0;
+
+  Messenger *get_messenger() {
+    return msgr;
+  }
+
+  /**
+   * Queue the given Message to send out on the given Connection.
+   * Success in this function does not guarantee Message delivery, only
+   * success in queueing the Message. Other guarantees may be provided based
+   * on the Connection policy.
+   *
+   * @param m The Message to send. The Messenger consumes a single reference
+   * when you pass it in.
+   *
+   * @return 0 on success, or -errno on failure.
+   */
+  virtual int send_message(Message *m) = 0;
+
+  virtual int send_message2(MessageRef m)
+  {
+    return send_message(m.detach()); /* send_message(Message *m) consumes a reference */
+  }
+
+  /**
+   * Send a "keepalive" ping along the given Connection, if it's working.
+   * If the underlying connection has broken, this function does nothing.
+   *
+   * @return 0, or implementation-defined error numbers.
+   */
+  virtual void send_keepalive() = 0;
+  /**
+   * Mark down the given Connection.
+   *
+   * This will cause us to discard its outgoing queue, and if reset
+   * detection is enabled in the policy and the endpoint tries to
+   * reconnect they will discard their queue when we inform them of
+   * the session reset.
+   *
+   * It does not generate any notifications to the Dispatcher.
+   */
+  virtual void mark_down() = 0;
+
+  /**
+   * Mark a Connection as "disposable", setting it to lossy
+   * (regardless of initial Policy).  This does not immediately close
+   * the Connection once Messages have been delivered, so as long as
+   * there are no errors you can continue to receive responses; but it
+   * will not attempt to reconnect for message delivery or preserve
+   * your old delivery semantics, either.
+   *
+   * TODO: There's some odd stuff going on in our SimpleMessenger
+   * implementation during connect that looks unused; is there
+   * more of a contract that that's enforcing?
+   */
+  virtual void mark_disposable() = 0;
+
+  // WARNING / FIXME: this is not populated for loopback connections
+  AuthCapsInfo& get_peer_caps_info() {
+    return peer_caps_info;
+  }
+  const EntityName& get_peer_entity_name() {
+    return peer_name;
+  }
+  uint64_t get_peer_global_id() {
+    return peer_global_id;
+  }
+
+  int get_peer_type() const { return peer_type; }
+  void set_peer_type(int t) { peer_type = t; }
+
+  // peer_id is only defined for msgr2
+  int64_t get_peer_id() const { return peer_id; }
+  void set_peer_id(int64_t t) { peer_id = t; }
+
+  bool peer_is_mon() const { return peer_type == CEPH_ENTITY_TYPE_MON; }
+  bool peer_is_mgr() const { return peer_type == CEPH_ENTITY_TYPE_MGR; }
+  bool peer_is_mds() const { return peer_type == CEPH_ENTITY_TYPE_MDS; }
+  bool peer_is_osd() const { return peer_type == CEPH_ENTITY_TYPE_OSD; }
+  bool peer_is_client() const { return peer_type == CEPH_ENTITY_TYPE_CLIENT; }
+
+  /// which of the peer's addrs is actually in use for this connection
+  virtual entity_addr_t get_peer_socket_addr() const = 0;
+
+  entity_addr_t get_peer_addr() const {
+    return peer_addrs->front();
+  }
+  const entity_addrvec_t& get_peer_addrs() const {
+    return *peer_addrs;
+  }
+  void set_peer_addr(const entity_addr_t& a) {
+    peer_addrs = entity_addrvec_t(a);
+  }
+  void set_peer_addrs(const entity_addrvec_t& av) { peer_addrs = av; }
+
+  uint64_t get_features() const { return features; }
+  bool has_feature(uint64_t f) const { return features & f; }
+  bool has_features(uint64_t f) const {
+    return (features & f) == f;
+  }
+  void set_features(uint64_t f) { features = f; }
+  void set_feature(uint64_t f) { features |= f; }
+
+  virtual int get_con_mode() const {
+    return CEPH_CON_MODE_CRC;
+  }
+
+  void post_rx_buffer(ceph_tid_t tid, bufferlist& bl) {
+#if 0
+    Mutex::Locker l(lock);
+    ++rx_buffers_version;
+    rx_buffers[tid] = pair<bufferlist,int>(bl, rx_buffers_version);
+#endif
+  }
+
+  void revoke_rx_buffer(ceph_tid_t tid) {
+#if 0
+    Mutex::Locker l(lock);
+    rx_buffers.erase(tid);
+#endif
+  }
+
+  utime_t get_last_keepalive() const {
+    Mutex::Locker l(lock);
+    return last_keepalive;
+  }
+  void set_last_keepalive(utime_t t) {
+    Mutex::Locker l(lock);
+    last_keepalive = t;
+  }
+  utime_t get_last_keepalive_ack() const {
+    Mutex::Locker l(lock);
+    return last_keepalive_ack;
+  }
+  void set_last_keepalive_ack(utime_t t) {
+    Mutex::Locker l(lock);
+    last_keepalive_ack = t;
+  }
+
+};
+
+typedef boost::intrusive_ptr<Connection> ConnectionRef;
+
+
+#endif /* CEPH_CONNECTION_H */