Please note that diffs are not public domain; they are subject to the
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===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/net/if.c,v
rcsdiff: /ftp/cvs/cvsroot/src/sys/net/if.c,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.482
retrieving revision 1.483
diff -u -p -r1.482 -r1.483
--- src/sys/net/if.c	2020/09/27 00:32:17	1.482
+++ src/sys/net/if.c	2020/09/27 19:16:28	1.483
@@ -1,4 +1,4 @@
-/*	$NetBSD: if.c,v 1.482 2020/09/27 00:32:17 roy Exp $	*/
+/*	$NetBSD: if.c,v 1.483 2020/09/27 19:16:28 roy Exp $	*/
 
 /*-
  * Copyright (c) 1999, 2000, 2001, 2008 The NetBSD Foundation, Inc.
@@ -90,7 +90,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.482 2020/09/27 00:32:17 roy Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if.c,v 1.483 2020/09/27 19:16:28 roy Exp $");
 
 #if defined(_KERNEL_OPT)
 #include "opt_inet.h"
@@ -2473,6 +2473,28 @@ out:
 }
 
 /*
+ * Used to mark addresses on an interface as DETATCHED or TENTATIVE
+ * and thus start Duplicate Address Detection without changing the
+ * real link state.
+ */
+void
+if_domain_link_state_change(struct ifnet *ifp, int link_state)
+{
+	struct domain *dp;
+	int s = splnet();
+
+	KERNEL_LOCK_UNLESS_NET_MPSAFE();
+
+	DOMAIN_FOREACH(dp) {
+		if (dp->dom_if_link_state_change != NULL)
+			dp->dom_if_link_state_change(ifp, link_state);
+	}
+
+	splx(s);
+	KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
+}
+
+/*
  * Default action when installing a local route on a point-to-point
  * interface.
  */