diff --git a/usrsctplib/netinet/sctp_crc32.h b/usrsctplib/netinet/sctp_crc32.h
new file mode 100755
index 0000000..0b1cbbb
--- /dev/null
+++ b/usrsctplib/netinet/sctp_crc32.h
@@ -0,0 +1,56 @@
+/*-
+ * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by 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:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * b) 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.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifdef __FreeBSD__
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/netinet/sctp_crc32.h 309607 2016-12-06 10:21:25Z tuexen $");
+#endif
+
+#ifndef _NETINET_SCTP_CRC32_H_
+#define _NETINET_SCTP_CRC32_H_
+
+#if defined(_KERNEL)
+#if !defined(SCTP_WITH_NO_CSUM)
+uint32_t sctp_calculate_cksum(struct mbuf *, uint32_t);
+#endif
+#if defined(__FreeBSD__)
+void sctp_delayed_cksum(struct mbuf *, uint32_t offset);
+#endif
+#endif				/* _KERNEL */
+#if defined(__Userspace__)
+#if !defined(SCTP_WITH_NO_CSUM)
+uint32_t calculate_crc32c(uint32_t, const unsigned char *, unsigned int);
+uint32_t sctp_finalize_crc32c(uint32_t);
+uint32_t sctp_calculate_cksum(struct mbuf *, uint32_t);
+#endif
+#endif
+#endif				/* __crc32c_h__ */