diff --git a/usrsctplib/user_environment.h b/usrsctplib/user_environment.h
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+++ b/usrsctplib/user_environment.h
@@ -0,0 +1,116 @@
+/*-
+ * Copyright (c) 2009-2010 Brad Penoff
+ * Copyright (c) 2009-2010 Humaira Kamal
+ * Copyright (c) 2011-2012 Irene Ruengeler
+ * Copyright (c) 2011-2012 Michael Tuexen
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _USER_ENVIRONMENT_H_
+#define _USER_ENVIRONMENT_H_
+/* __Userspace__ */
+#include <sys/types.h>
+
+#ifdef __Userspace_os_FreeBSD
+#ifndef _SYS_MUTEX_H_
+#include <sys/mutex.h>
+#endif
+#endif
+#if defined (__Userspace_os_Windows)
+#include "netinet/sctp_os_userspace.h"
+#endif
+
+/* maxsockets is used in SCTP_ZONE_INIT call. It refers to
+ * kern.ipc.maxsockets kernel environment variable.
+ */
+extern int maxsockets;
+
+/* int hz; is declared in sys/kern/subr_param.c and refers to kernel timer frequency.
+ * See http://ivoras.sharanet.org/freebsd/vmware.html for additional info about kern.hz
+ * hz is initialized in void init_param1(void) in that file.
+ */
+extern int hz;
+
+
+/* The following two ints define a range of available ephermal ports. */
+extern int ipport_firstauto, ipport_lastauto;
+
+/* nmbclusters is used in sctp_usrreq.c (e.g., sctp_init). In the FreeBSD kernel,
+ *  this is 1024 + maxusers * 64.
+ */
+extern int nmbclusters;
+
+#if !defined (__Userspace_os_Windows)
+#define min(a,b) ((a)>(b)?(b):(a))
+#define max(a,b) ((a)>(b)?(a):(b))
+#endif
+
+extern int read_random(void *buf, int count);
+
+/* errno's may differ per OS.  errno.h now included in sctp_os_userspace.h */
+/* Source: /usr/src/sys/sys/errno.h */
+/* #define	ENOSPC		28 */		/* No space left on device */
+/* #define	ENOBUFS		55 */		/* No buffer space available */
+/* #define	ENOMEM		12 */		/* Cannot allocate memory */
+/* #define	EACCES		13 */		/* Permission denied */
+/* #define	EFAULT		14 */		/* Bad address */
+/* #define	EHOSTDOWN	64 */		/* Host is down */
+/* #define	EHOSTUNREACH	65 */		/* No route to host */
+
+/* Source ip_output.c. extern'd in ip_var.h */
+extern u_short ip_id;
+
+#if defined(__Userspace_os_Linux)
+#define IPV6_VERSION            0x60
+#endif
+
+#if defined(INVARIANTS)
+#include <stdlib.h>
+
+static inline void
+terminate_non_graceful(void) {
+	abort();
+}
+
+#define panic(...)                       \
+	do {                             \
+		SCTP_PRINTF(__VA_ARGS__);\
+		SCTP_PRINTF("\n");       \
+		terminate_non_graceful();\
+} while (0)
+
+#define KASSERT(cond, args)          \
+	do {                         \
+		if (!(cond)) {       \
+			panic args ;\
+		}                    \
+	} while (0)
+#else
+#define KASSERT(cond, args)
+#endif
+
+/* necessary for sctp_pcb.c */
+extern int ip_defttl;
+#endif