diff --git a/ospfd/ospf_packet.h b/ospfd/ospf_packet.h
new file mode 100644
index 0000000..81a104c
--- /dev/null
+++ b/ospfd/ospf_packet.h
@@ -0,0 +1,171 @@
+/*
+ * OSPF Sending and Receiving OSPF Packets.
+ * Copyright (C) 1999 Toshiaki Takada
+ *
+ * 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 _ZEBRA_OSPF_PACKET_H
+#define _ZEBRA_OSPF_PACKET_H
+
+#define OSPF_HEADER_SIZE         24
+#define OSPF_AUTH_SIMPLE_SIZE     8
+#define OSPF_AUTH_MD5_SIZE       16
+
+#define OSPF_MAX_PACKET_SIZE  65535   /* includes IP Header size. */
+#define OSPF_HELLO_MIN_SIZE      20   /* not including neighbors */
+#define OSPF_DB_DESC_MIN_SIZE     8
+#define OSPF_LS_REQ_MIN_SIZE      0
+#define OSPF_LS_UPD_MIN_SIZE      4
+#define OSPF_LS_ACK_MIN_SIZE      0
+
+#define OSPF_MSG_HELLO         1  /* OSPF Hello Message. */
+#define OSPF_MSG_DB_DESC       2  /* OSPF Database Descriptoin Message. */
+#define OSPF_MSG_LS_REQ        3  /* OSPF Link State Request Message. */
+#define OSPF_MSG_LS_UPD        4  /* OSPF Link State Update Message. */
+#define OSPF_MSG_LS_ACK        5  /* OSPF Link State Acknoledgement Message. */
+
+#define OSPF_SEND_PACKET_DIRECT         1
+#define OSPF_SEND_PACKET_INDIRECT       2
+
+#ifdef HAVE_NSSA
+#define OSPF_SEND_PACKET_LOOP           3
+#endif /* HAVE_NSSA */
+
+#define OSPF_HELLO_REPLY_DELAY          1
+
+struct ospf_packet
+{
+  struct ospf_packet *next;
+
+  /* Pointer to data stream. */
+  struct stream *s;
+
+  /* IP destination address. */
+  struct in_addr dst;
+
+  /* OSPF packet length. */
+  u_int16_t length;
+};
+
+/* OSPF packet queue structure. */
+struct ospf_fifo
+{
+  unsigned long count;
+
+  struct ospf_packet *head;
+  struct ospf_packet *tail;
+};
+
+/* OSPF packet header structure. */
+struct ospf_header
+{
+  u_char version;                       /* OSPF Version. */
+  u_char type;                          /* Packet Type. */
+  u_int16_t length;                     /* Packet Length. */
+  struct in_addr router_id;             /* Router ID. */
+  struct in_addr area_id;               /* Area ID. */
+  u_int16_t checksum;                   /* Check Sum. */
+  u_int16_t auth_type;                  /* Authentication Type. */
+  /* Authentication Data. */
+  union
+  {
+    /* Simple Authentication. */
+    u_char auth_data [OSPF_AUTH_SIMPLE_SIZE];
+    /* Cryptographic Authentication. */
+    struct
+    {
+      u_int16_t zero;                   /* Should be 0. */
+      u_char key_id;                    /* Key ID. */
+      u_char auth_data_len;             /* Auth Data Length. */
+      u_int32_t crypt_seqnum;           /* Cryptographic Sequence Number. */
+    } crypt;
+  } u;
+};
+
+/* OSPF Hello body format. */
+struct ospf_hello
+{
+  struct in_addr network_mask;
+  u_int16_t hello_interval;
+  u_char options;
+  u_char priority;
+  u_int32_t dead_interval;
+  struct in_addr d_router;
+  struct in_addr bd_router;
+  struct in_addr neighbors[1];
+};
+
+/* OSPF Database Description body format. */
+struct ospf_db_desc
+{
+  u_int16_t mtu;
+  u_char options;
+  u_char flags;
+  u_int32_t dd_seqnum;
+};
+
+
+/* Macros. */
+#define OSPF_PACKET_MAX(oi)     ospf_packet_max (oi)
+/*
+#define OSPF_PACKET_MAX(oi)     (((oi)->ifp->mtu - ((oi)->auth_md5 ? OSPF_AUTH_MD5_SIZE : 0)) - 88)
+*/
+
+#define OSPF_OUTPUT_PNT(S)      ((S)->data + (S)->putp)
+#define OSPF_OUTPUT_LENGTH(S)   ((S)->endp)
+
+#define IS_SET_DD_MS(X)         ((X) & OSPF_DD_FLAG_MS)
+#define IS_SET_DD_M(X)          ((X) & OSPF_DD_FLAG_M)
+#define IS_SET_DD_I(X)          ((X) & OSPF_DD_FLAG_I)
+#define IS_SET_DD_ALL(X)        ((X) & OSPF_DD_FLAG_ALL)
+
+/* Prototypes. */
+void ospf_output_forward (struct stream *, int);
+struct ospf_packet *ospf_packet_new (size_t);
+void ospf_packet_free (struct ospf_packet *);
+struct ospf_fifo *ospf_fifo_new ();
+void ospf_fifo_push (struct ospf_fifo *, struct ospf_packet *);
+struct ospf_packet *ospf_fifo_pop (struct ospf_fifo *);
+struct ospf_packet *ospf_fifo_head (struct ospf_fifo *);
+void ospf_fifo_flush (struct ospf_fifo *);
+void ospf_fifo_free (struct ospf_fifo *);
+void ospf_packet_add (struct ospf_interface *, struct ospf_packet *);
+void ospf_packet_delete (struct ospf_interface *);
+struct stream *ospf_stream_dup (struct stream *);
+struct ospf_packet *ospf_packet_dup (struct ospf_packet *);
+
+int ospf_read (struct thread *);
+void ospf_hello_send (struct ospf_interface *);
+void ospf_db_desc_send (struct ospf_neighbor *);
+void ospf_db_desc_resend (struct ospf_neighbor *);
+void ospf_ls_req_send (struct ospf_neighbor *);
+void ospf_ls_upd_send_lsa (struct ospf_neighbor *, struct ospf_lsa *, int);
+void ospf_ls_upd_send (struct ospf_neighbor *, list, int);
+void ospf_ls_ack_send (struct ospf_neighbor *, struct ospf_lsa *);
+void ospf_ls_ack_send_delayed (struct ospf_interface *);
+void ospf_ls_retransmit (struct ospf_interface *, struct ospf_lsa *);
+void ospf_ls_req_event (struct ospf_neighbor *);
+
+int ospf_ls_upd_timer (struct thread *);
+int ospf_ls_ack_timer (struct thread *);
+int ospf_poll_timer (struct thread *);
+int ospf_hello_reply_timer (struct thread *);
+void ospf_hello_send_sub (struct ospf_interface *, struct in_addr *);
+
+#endif /* _ZEBRA_OSPF_PACKET_H */