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diff --git a/edns-subnet/edns-subnet.h b/edns-subnet/edns-subnet.h
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+++ b/edns-subnet/edns-subnet.h
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+/*
+ * edns-subnet/edns-subnet.h - Subnet option related constants 
+ *
+ * Copyright (c) 2013, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * 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.
+ * 
+ * Neither the name of the NLNET LABS 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+ * HOLDER 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.
+ */
+/**
+ * \file
+ * Subnet option related constants. 
+ */
+
+#include "util/net_help.h"
+
+#ifndef EDNSSUBNET_EDNSSUBNET_H
+#define EDNSSUBNET_EDNSSUBNET_H
+
+/** In use by the edns subnet option code, as assigned by IANA */
+#define EDNSSUBNET_ADDRFAM_IP4 1
+#define EDNSSUBNET_ADDRFAM_IP6 2
+
+/**
+ * ECS option
+ */
+struct ecs_data {
+	uint16_t subnet_addr_fam;
+	uint8_t subnet_source_mask;
+	uint8_t subnet_scope_mask;
+	uint8_t subnet_addr[INET6_SIZE];
+	int subnet_validdata;
+};
+
+/** 
+ * copy the first n BITS from src to dst iff both src and dst 
+ * are large enough, return 0 on succes
+ */
+int
+copy_clear(uint8_t* dst, size_t dstlen, uint8_t* src, size_t srclen, size_t n);
+
+#endif /* EDNSSUBNET_EDNSSUBNET_H */