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diff --git a/sys/sys/domain.h b/sys/sys/domain.h
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+/* $OpenBSD: domain.h,v 1.20 2019/06/13 08:12:11 claudio Exp $ */
+/* $NetBSD: domain.h,v 1.10 1996/02/09 18:25:07 christos Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1993
+ * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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.
+ *
+ * @(#)domain.h 8.1 (Berkeley) 6/2/93
+ */
+
+/*
+ * Structure per communications domain.
+ */
+
+#ifndef _SOCKLEN_T_DEFINED_
+#define _SOCKLEN_T_DEFINED_
+typedef __socklen_t socklen_t; /* length type for network syscalls */
+#endif
+
+/*
+ * Forward structure declarations for function prototypes [sic].
+ */
+struct mbuf;
+struct ifnet;
+
+struct domain {
+ int dom_family; /* AF_xxx */
+ char *dom_name;
+ void (*dom_init)(void); /* initialize domain data structures */
+ /* externalize access rights */
+ int (*dom_externalize)(struct mbuf *, socklen_t, int);
+ /* dispose of internalized rights */
+ void (*dom_dispose)(struct mbuf *);
+ const struct protosw *dom_protosw, *dom_protoswNPROTOSW;
+ /* initialize routing table */
+ unsigned int dom_sasize; /* size of sockaddr structure */
+ unsigned int dom_rtoffset; /* offset of the key, in bytes */
+ unsigned int dom_maxplen; /* maxium prefix length, in bits */
+ void *(*dom_ifattach)(struct ifnet *);
+ void (*dom_ifdetach)(struct ifnet *, void *);
+ /* af-dependent data on ifnet */
+};
+
+#ifdef _KERNEL
+extern struct domain *domains[];
+void domaininit(void);
+
+extern struct domain inetdomain;
+
+#ifdef INET6
+extern struct domain inet6domain;
+#endif
+
+#endif /* _KERNEL */