diff --git a/ospf6d/ospf6_message.h b/ospf6d/ospf6_message.h
new file mode 100644
index 0000000..105cb4f
--- /dev/null
+++ b/ospf6d/ospf6_message.h
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 1999 Yasuhiro Ohara
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra 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, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the 
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 
+ * Boston, MA 02111-1307, USA.  
+ */
+
+#ifndef OSPF6_MESSAGE_H
+#define OSPF6_MESSAGE_H
+
+#include "ospf6_prefix.h"
+#include "ospf6_lsa.h"
+
+/* Type */
+#define OSPF6_MESSAGE_TYPE_NONE     0x0
+#define OSPF6_MESSAGE_TYPE_UNKNOWN  0x0
+#define OSPF6_MESSAGE_TYPE_HELLO    0x1  /* Discover/maintain neighbors */
+#define OSPF6_MESSAGE_TYPE_DBDESC   0x2  /* Summarize database contents */
+#define OSPF6_MESSAGE_TYPE_LSREQ    0x3  /* Database download */
+#define OSPF6_MESSAGE_TYPE_LSUPDATE 0x4  /* Database update */
+#define OSPF6_MESSAGE_TYPE_LSACK    0x5  /* Flooding acknowledgment */
+#define OSPF6_MESSAGE_TYPE_MAX      0x6
+
+/* OSPFv3 packet header */
+struct ospf6_header
+{
+  u_char    version;
+  u_char    type;
+  u_int16_t len;
+  u_int32_t router_id;
+  u_int32_t area_id;
+  u_int16_t cksum;
+  u_char    instance_id;
+  u_char    reserved;
+};
+
+/* Hello */
+#define MAXLISTEDNBR     64
+struct ospf6_hello
+{
+  u_int32_t interface_id;
+  u_char    rtr_pri;
+  u_char    options[3];
+  u_int16_t hello_interval;
+  u_int16_t router_dead_interval;
+  u_int32_t dr;
+  u_int32_t bdr;
+};
+
+/* Database Description */
+struct ospf6_dbdesc
+{
+  u_char    mbz1;
+  u_char    options[3];
+  u_int16_t ifmtu;
+  u_char    mbz2;
+  u_char    bits;
+  u_int32_t seqnum;
+  /* Followed by LSAs */
+};
+#define DEFAULT_INTERFACE_MTU 1500
+
+#define DD_IS_MSBIT_SET(x) ((x) & (1 << 0))
+#define DD_MSBIT_SET(x) ((x) |= (1 << 0))
+#define DD_MSBIT_CLEAR(x) ((x) &= ~(1 << 0))
+#define DD_IS_MBIT_SET(x) ((x) & (1 << 1))
+#define DD_MBIT_SET(x) ((x) |= (1 << 1))
+#define DD_MBIT_CLEAR(x) ((x) &= ~(1 << 1))
+#define DD_IS_IBIT_SET(x) ((x) & (1 << 2))
+#define DD_IBIT_SET(x) ((x) |= (1 << 2))
+#define DD_IBIT_CLEAR(x) ((x) &= ~(1 << 2))
+
+#define DDBIT_IS_MASTER(x)   ((x) &   (1 << 0))
+#define DDBIT_IS_SLAVE(x)  (!((x) &   (1 << 0)))
+#define DDBIT_SET_MASTER(x)  ((x) |=  (1 << 0))
+#define DDBIT_SET_SLAVE(x)   ((x) |= ~(1 << 0))
+#define DDBIT_IS_MORE(x)     ((x) &   (1 << 1))
+#define DDBIT_SET_MORE(x)    ((x) |=  (1 << 1))
+#define DDBIT_CLR_MORE(x)    ((x) |= ~(1 << 1))
+#define DDBIT_IS_INITIAL(x)  ((x) &   (1 << 2))
+#define DDBIT_SET_INITIAL(x) ((x) |=  (1 << 2))
+#define DDBIT_CLR_INITIAL(x) ((x) |= ~(1 << 2))
+
+#define OSPF6_DBDESC_BIT_MASTER  0x01
+#define OSPF6_DBDESC_BIT_MORE    0x02
+#define OSPF6_DBDESC_BIT_INITIAL 0x04
+
+/* Link State Request */
+struct ospf6_lsreq
+{
+  u_int16_t mbz;          /* Must Be Zero */
+  u_int16_t type;         /* LS type */
+  u_int32_t id;           /* Link State ID */
+  u_int32_t adv_router;   /* Advertising Router */
+};
+
+/* Link State Update */
+struct ospf6_lsupdate
+{
+  u_int32_t lsupdate_num;
+};
+
+/* Link State Acknowledgement */
+  /* no need for structure,
+     it will include only LSA header in the packet body.*/
+
+/* definition for ospf6_message.c */
+#define OSPF6_MESSAGE_RECEIVE_BUFSIZE 5120
+#define OSPF6_MESSAGE_IOVEC_END       1024
+
+#define IS_OVER_MTU(message,mtu,addsize) \
+          (iov_totallen(message)+(addsize) >= \
+            (mtu)-sizeof(struct ospf6_header))
+
+#define OSPF6_MESSAGE_IOVEC_SIZE  1024
+#define OSPF6_MESSAGE_CLEAR(msg) \
+do { \
+  int x; \
+  for (x = 0; x < OSPF6_MESSAGE_IOVEC_SIZE; x++) \
+    { \
+      (msg)[x].iov_base = NULL; \
+      (msg)[x].iov_len = 0; \
+    } \
+} while (0)
+
+#define OSPF6_MESSAGE_ATTACH(msg,buf,bufsize) \
+do { \
+  int x; \
+  for (x = 0; x < OSPF6_MESSAGE_IOVEC_SIZE; x++) \
+    if ((msg)[x].iov_base == (void *)NULL && (msg)[x].iov_len == 0) \
+      break; \
+  if (x < OSPF6_MESSAGE_IOVEC_SIZE - 1) \
+    { \
+      (msg)[x].iov_base = (void *)(buf); \
+      (msg)[x].iov_len = (bufsize); \
+    } \
+} while (0)
+
+#define OSPF6_MESSAGE_JOIN(msg,join) \
+do { \
+  int x,y; \
+  for (x = 0; x < OSPF6_MESSAGE_IOVEC_SIZE; x++) \
+    if ((msg)[x].iov_base == NULL && (msg)[x].iov_len == 0) \
+      break; \
+  for (y = x; y < OSPF6_MESSAGE_IOVEC_SIZE; y++) \
+    { \
+      (msg)[y].iov_base = (join)[y - x].iov_base; \
+      (msg)[y].iov_len = (join)[y - x].iov_len; \
+    } \
+} while (0)
+
+
+/* Statistics */
+struct ospf6_message_stat
+{
+  u_int32_t send;
+  u_int32_t send_octet;
+  u_int32_t recv;
+  u_int32_t recv_octet;
+};
+
+/* Type string */
+extern char *ospf6_message_type_string[];
+
+/* Function Prototypes */
+int ospf6_receive (struct thread *);
+
+int ospf6_send_hello (struct thread *);
+int ospf6_send_dbdesc_rxmt (struct thread *);
+int ospf6_send_dbdesc (struct thread *);
+int ospf6_send_lsreq (struct thread *);
+
+struct ospf6_neighbor;
+struct ospf6_interface;
+int
+ospf6_send_lsupdate_rxmt (struct thread *);
+void
+ospf6_send_lsupdate_direct (struct ospf6_lsa *, struct ospf6_neighbor *);
+void
+ospf6_send_lsupdate_flood (struct ospf6_lsa *, struct ospf6_interface *);
+
+int ospf6_send_lsack_delayed (struct thread *);
+int ospf6_send_lsack_direct (struct thread *);
+
+void ospf6_message_send (u_char, struct iovec *, struct in6_addr *, u_int);
+
+#endif /* OSPF6_MESSAGE_H */
+