diff --git a/sys/compat/linuxkpi/common/include/net/addrconf.h b/sys/compat/linuxkpi/common/include/net/addrconf.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/net/addrconf.h
@@ -0,0 +1,51 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 The FreeBSD Foundation
+ *
+ * This software was developed by Björn Zeeb under sponsorship from
+ * the FreeBSD Foundation.
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	__LKPI_NET_ADDRCONF_H
+#define	__LKPI_NET_ADDRCONF_H
+
+#include <sys/types.h>
+#include <netinet/in.h>
+
+static __inline void
+addrconf_addr_solict_mult(struct in6_addr *ia6, struct in6_addr *sol)
+{
+
+	sol->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
+	sol->s6_addr16[1] = 0;
+	sol->s6_addr32[1] = 0;
+	sol->s6_addr32[2] = IPV6_ADDR_INT32_ONE;
+	sol->s6_addr32[3] = ia6->s6_addr32[3];
+	sol->s6_addr8[12] = 0xff;
+}
+
+#endif	/* __LKPI_NET_ADDRCONF_H */