--- /dev/null
+/*
+ * "Copyright (c) 2008 The Regents of the University of California.
+ * All rights reserved."
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ *
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
+ * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
+ *
+ */
+#ifndef _IN_CKSUM_H_
+#define _IN_CKSUM_H_
+
+/* in_cksum.h
+ * Declaration of Internet checksum routine.
+ *
+ * $Id$
+ */
+
+#include <stdint.h>
+#include "ip.h"
+
+typedef struct {
+ const uint8_t *ptr;
+ int len;
+} vec_t;
+
+extern int in_cksum(const vec_t *vec, int veclen);
+
+// extern uint16_t in_cksum(const vec_t *vec, int veclen);
+
+extern uint16_t msg_cksum(struct split_ip_msg *msg, uint8_t nxt_hdr);
+
+#endif