--- /dev/null
+/*!\file netinet6/ah6.h
+ * IPv6 Authentication header.
+ */
+
+/* $FreeBSD: src/sys/netinet6/ah6.h,v 1.4 2001/06/11 12:39:03 ume Exp $ */
+/* $KAME: ah.h,v 1.13 2000/10/18 21:28:00 itojun Exp $ */
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * 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.
+ * 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
+ */
+
+/*
+ * RFC1826/2402 authentication header.
+ */
+
+#ifndef _NETINET6_AH6_H_
+#define _NETINET6_AH6_H_
+
+#ifdef _KERNEL
+struct secasvar;
+
+extern int ah6_input (struct mbuf **, int *, int));
+extern int ah6_output (struct mbuf *, u_char *, struct mbuf *,
+ struct ipsecrequest *);
+extern int ah6_calccksum (struct mbuf *, caddr_t, size_t,
+ const struct ah_algorithm *, struct secasvar *);
+
+extern void ah6_ctlinput (int, struct sockaddr *, void *);
+#endif
+
+#endif /*_NETINET6_AH6_H_*/