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diff --git a/src/or/entry_connection_st.h b/src/or/entry_connection_st.h
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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) 2007-2017, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef ENTRY_CONNECTION_ST_H
+#define ENTRY_CONNECTION_ST_H
+
+#include "edge_connection_st.h"
+
+/** Subtype of edge_connection_t for an "entry connection" -- that is, a SOCKS
+ * connection, a DNS request, a TransPort connection or a NATD connection */
+struct entry_connection_t {
+  struct edge_connection_t edge_;
+
+  /** Nickname of planned exit node -- used with .exit support. */
+  /* XXX prop220: we need to make chosen_exit_name able to encode Ed IDs too.
+   * That's logically part of the UI parts for prop220 though. */
+  char *chosen_exit_name;
+
+  socks_request_t *socks_request; /**< SOCKS structure describing request (AP
+                                   * only.) */
+
+  /* === Isolation related, AP only. === */
+  entry_port_cfg_t entry_cfg;
+  /** AP only: The newnym epoch in which we created this connection. */
+  unsigned nym_epoch;
+
+  /** AP only: The original requested address before we rewrote it. */
+  char *original_dest_address;
+  /* Other fields to isolate on already exist.  The ClientAddr is addr.  The
+     ClientProtocol is a combination of type and socks_request->
+     socks_version.  SocksAuth is socks_request->username/password.
+     DestAddr is in socks_request->address. */
+
+  /** Number of times we've reassigned this application connection to
+   * a new circuit. We keep track because the timeout is longer if we've
+   * already retried several times. */
+  uint8_t num_socks_retries;
+
+  /** For AP connections only: buffer for data that we have sent
+   * optimistically, which we might need to re-send if we have to
+   * retry this connection. */
+  struct buf_t *pending_optimistic_data;
+  /* For AP connections only: buffer for data that we previously sent
+  * optimistically which we are currently re-sending as we retry this
+  * connection. */
+  struct buf_t *sending_optimistic_data;
+
+  /** If this is a DNSPort connection, this field holds the pending DNS
+   * request that we're going to try to answer.  */
+  struct evdns_server_request *dns_server_request;
+
+#define DEBUGGING_17659
+
+#ifdef DEBUGGING_17659
+  uint16_t marked_pending_circ_line;
+  const char *marked_pending_circ_file;
+#endif
+
+#define NUM_CIRCUITS_LAUNCHED_THRESHOLD 10
+  /** Number of times we've launched a circuit to handle this stream. If
+    * it gets too high, that could indicate an inconsistency between our
+    * "launch a circuit to handle this stream" logic and our "attach our
+    * stream to one of the available circuits" logic. */
+  unsigned int num_circuits_launched:4;
+
+  /** True iff this stream must attach to a one-hop circuit (e.g. for
+   * begin_dir). */
+  unsigned int want_onehop:1;
+  /** True iff this stream should use a BEGIN_DIR relay command to establish
+   * itself rather than BEGIN (either via onehop or via a whole circuit). */
+  unsigned int use_begindir:1;
+
+  /** For AP connections only. If 1, and we fail to reach the chosen exit,
+   * stop requiring it. */
+  unsigned int chosen_exit_optional:1;
+  /** For AP connections only. If non-zero, this exit node was picked as
+   * a result of the TrackHostExit, and the value decrements every time
+   * we fail to complete a circuit to our chosen exit -- if it reaches
+   * zero, abandon the associated mapaddress. */
+  unsigned int chosen_exit_retries:3;
+
+  /** True iff this is an AP connection that came from a transparent or
+   * NATd connection */
+  unsigned int is_transparent_ap:1;
+
+  /** For AP connections only: Set if this connection's target exit node
+   * allows optimistic data (that is, data sent on this stream before
+   * the exit has sent a CONNECTED cell) and we have chosen to use it.
+   */
+  unsigned int may_use_optimistic_data : 1;
+};
+
+/** Cast a entry_connection_t subtype pointer to a edge_connection_t **/
+#define ENTRY_TO_EDGE_CONN(c) (&(((c))->edge_))
+
+#endif
+