--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netinet/in.h>
+
+#include "macro.h"
+#include "util.h"
+
+union in_addr_union {
+ struct in_addr in;
+ struct in6_addr in6;
+};
+
+int in_addr_null(unsigned family, union in_addr_union *u);
+int in_addr_equal(unsigned family, union in_addr_union *a, union in_addr_union *b);
+int in_addr_prefix_intersect(unsigned family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
+int in_addr_prefix_next(unsigned family, union in_addr_union *u, unsigned prefixlen);
+int in_addr_to_string(unsigned family, const union in_addr_union *u, char **ret);
+int in_addr_from_string(unsigned family, const char *s, union in_addr_union *ret);
+
+static inline size_t PROTO_ADDRESS_SIZE(int proto) {
+ assert(proto == AF_INET || proto == AF_INET6);
+ return proto == AF_INET6 ? 16 : 4;
+}