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+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Interface for module for formatting GRE packets.
+ */
+
+#ifndef __GRE_PACKET_H__
+#define __GRE_PACKET_H__
+
+#include "types.h"
+
+#include "packet.h"
+
+/* Append a GRE header to the end of the given packet. On success,
+ * return STATUS_OK; on error return STATUS_ERR and fill in a
+ * malloc-allocated error message in *error.
+ */
+extern int gre_header_append(struct packet *packet,
+ const struct gre *gre, char **error);
+
+/* Finalize the GRE header by filling in all necessary fields that
+ * were not filled in at parse time.
+ */
+extern int gre_header_finish(struct packet *packet,
+ struct header *header, struct header *next_inner);
+
+#endif /* __GRE_PACKET_H__ */