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diff --git a/include/haproxy/session-t.h b/include/haproxy/session-t.h
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+++ b/include/haproxy/session-t.h
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+/*
+ * include/haproxy/session-t.h
+ * This file defines everything related to sessions.
+ *
+ * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _HAPROXY_SESSION_T_H
+#define _HAPROXY_SESSION_T_H
+
+
+#include <sys/time.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <haproxy/api-t.h>
+#include <haproxy/obj_type-t.h>
+#include <haproxy/stick_table-t.h>
+#include <haproxy/task-t.h>
+#include <haproxy/vars-t.h>
+
+
+/* session flags */
+enum {
+	SESS_FL_NONE          = 0x00000000, /* nothing */
+	SESS_FL_PREFER_LAST   = 0x00000001, /* NTML authent, we should reuse last conn */
+};
+
+/* max number of idle server connections kept attached to a session */
+#define MAX_SRV_LIST	5
+
+struct session {
+	struct proxy *fe;               /* the proxy this session depends on for the client side */
+	struct listener *listener;      /* the listener by which the request arrived */
+	enum obj_type *origin;          /* the connection / applet which initiated this session */
+	struct timeval accept_date;     /* date of the session's accept() in user date */
+	ullong accept_ts;               /* date of the session's accept() in internal date (monotonic) */
+	struct stkctr *stkctr;          /* stick counters for tcp-connection */
+	struct vars vars;               /* list of variables for the session scope. */
+	struct task *task;              /* handshake timeout processing */
+	long t_handshake;               /* handshake duration, -1 = not completed */
+	long t_idle;                    /* idle duration, -1 if never occurs */
+	int idle_conns;                 /* Number of connections we're currently responsible for that we are not using */
+	unsigned int flags;             /* session flags, SESS_FL_* */
+	struct list srv_list;           /* List of servers and the connections the session is currently responsible for */
+	struct sockaddr_storage *src; /* source address (pool), when known, otherwise NULL */
+	struct sockaddr_storage *dst; /* destination address (pool), when known, otherwise NULL */
+};
+
+struct sess_srv_list {
+	void *target;
+	struct list conn_list;          /* Head of the connections list */
+	struct list srv_list;           /* Next element of the server list */
+};
+
+#endif /* _HAPROXY_SESSION_T_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */