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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)
+ *
+ * Our own UDP header declarations, so we have something that's
+ * portable and somewhat more readable than a typical system header
+ * file.
+ *
+ * We cannot include the kernel's linux/udp.h because this tool tries
+ * to compile and work for basically any Linux/BSD kernel version. So
+ * we declare our own version of various UDP-related definitions here.
+ */
+
+#ifndef __UDP_HEADERS_H__
+#define __UDP_HEADERS_H__
+
+#include "types.h"
+
+/* UDP header. See RFC 768. */
+struct udp {
+ __be16 src_port;
+ __be16 dst_port;
+ __be16 len; /* UDP length in bytes, includes UDP header */
+ __sum16 check; /* UDP checksum */
+};
+
+#endif /* __UDP_HEADERS_H__ */