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diff --git a/external/unbound/dns64/dns64.h b/external/unbound/dns64/dns64.h
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+++ b/external/unbound/dns64/dns64.h
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+/*
+ * dns64/dns64.h - DNS64 module
+ *
+ * Copyright (c) 2009, Viagénie. 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 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.
+ */
+
+/**
+ * \file
+ *
+ * This file contains a module that performs DNS64 query processing.
+ */
+
+#ifndef DNS64_DNS64_H
+#define DNS64_DNS64_H
+#include "util/module.h"
+
+/**
+ * Get the dns64 function block.
+ * @return: function block with function pointers to dns64 methods.
+ */
+struct module_func_block *dns64_get_funcblock(void);
+
+/** dns64 init */
+int dns64_init(struct module_env* env, int id);
+
+/** dns64 deinit */
+void dns64_deinit(struct module_env* env, int id);
+
+/** dns64 operate on a query */
+void dns64_operate(struct module_qstate* qstate, enum module_ev event, int id,
+		struct outbound_entry* outbound);
+
+void dns64_inform_super(struct module_qstate* qstate, int id,
+    struct module_qstate* super);
+
+/** dns64 cleanup query state */
+void dns64_clear(struct module_qstate* qstate, int id);
+
+/** dns64 alloc size routine */
+size_t dns64_get_mem(struct module_env* env, int id);
+
+#endif /* DNS64_DNS64_H */