diff --git a/ospf6d/ospf6_proto.h b/ospf6d/ospf6_proto.h
index 9a95444..447513a 100644
--- a/ospf6d/ospf6_proto.h
+++ b/ospf6d/ospf6_proto.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1999 Yasuhiro Ohara
+ * Copyright (C) 2003 Yasuhiro Ohara
  *
  * This file is part of GNU Zebra.
  *
@@ -23,7 +23,7 @@
 #define OSPF6_PROTO_H
 
 /* OSPF protocol version */
-#define OSPF6_VERSION		3
+#define OSPFV3_VERSION           3
 
 /* OSPF protocol number. */
 #ifndef IPPROTO_OSPFIGP
@@ -31,28 +31,31 @@
 #endif
 
 /* TOS field normaly null */
-#define OSPF6_TOS_VALUE               0x0
+#define DEFAULT_TOS_VALUE      0x0
 
 /* Architectural Constants */
-#define OSPF6_LS_REFRESH_TIME         1800       /* 30 min */
-#define OSPF6_MIN_LS_INTERVAL         5
-#define OSPF6_MIN_LS_ARRIVAL          1
-#define MAXAGE                  3600       /* 1 hour */
-#define CHECK_AGE               300        /* 5 min */
-#define MAX_AGE_DIFF            900        /* 15 min */
-#define LS_INFINITY             0xffffff   /* 24-bit binary value */
-#define INITIAL_SEQUENCE_NUMBER 0x80000001 /* signed 32-bit integer */
-#define MAX_SEQUENCE_NUMBER     0x7fffffff /* signed 32-bit integer */
-
-#define MAXOSPFMESSAGELEN         4096
+#define LS_REFRESH_TIME                1800  /* 30 min */
+#define MIN_LS_INTERVAL                   5
+#define MIN_LS_ARRIVAL                    1
+#define MAXAGE                         3600  /* 1 hour */
+#define CHECK_AGE                       300  /* 5 min */
+#define MAX_AGE_DIFF                    900  /* 15 min */
+#define LS_INFINITY                0xffffff  /* 24-bit binary value */
+#define INITIAL_SEQUENCE_NUMBER  0x80000001  /* signed 32-bit integer */
+#define MAX_SEQUENCE_NUMBER      0x7fffffff  /* signed 32-bit integer */
 
 #define ALLSPFROUTERS6 "ff02::5"
 #define ALLDROUTERS6   "ff02::6"
 
 /* Configurable Constants */
 
-#define DEFAULT_HELLO_INTERVAL    10
-#define DEFAULT_ROUTER_DEAD_TIMER 40
+#define DEFAULT_HELLO_INTERVAL       10
+#define DEFAULT_ROUTER_DEAD_INTERVAL 40
+
+#define OSPF6_ROUTER_BIT_W     (1 << 3)
+#define OSPF6_ROUTER_BIT_V     (1 << 2)
+#define OSPF6_ROUTER_BIT_E     (1 << 1)
+#define OSPF6_ROUTER_BIT_B     (1 << 0)
 
 /* OSPF options */
 /* present in HELLO, DD, LSA */
@@ -61,15 +64,58 @@
 #define OSPF6_OPT_CLEAR(x,opt) ((x)[2] &= ~(opt))
 #define OSPF6_OPT_CLEAR_ALL(x) ((x)[0] = (x)[1] = (x)[2] = 0)
 
-#define OSPF6_OPT_V6 (1 << 0)   /* IPv6 forwarding Capability */
-#define OSPF6_OPT_E  (1 << 1)   /* AS External Capability */
-#define OSPF6_OPT_MC (1 << 2)   /* Multicasting Capability */
-#define OSPF6_OPT_N  (1 << 3)   /* Handling Type-7 LSA Capability */
-#define OSPF6_OPT_R  (1 << 4)   /* Forwarding Capability (Any Protocol) */
 #define OSPF6_OPT_DC (1 << 5)   /* Demand Circuit handling Capability */
+#define OSPF6_OPT_R  (1 << 4)   /* Forwarding Capability (Any Protocol) */
+#define OSPF6_OPT_N  (1 << 3)   /* Handling Type-7 LSA Capability */
+#define OSPF6_OPT_MC (1 << 2)   /* Multicasting Capability */
+#define OSPF6_OPT_E  (1 << 1)   /* AS External Capability */
+#define OSPF6_OPT_V6 (1 << 0)   /* IPv6 forwarding Capability */
 
-char *
-ospf6_options_string (u_char opt_capability[3], char *buffer, int size);
+/* OSPF6 Prefix */
+struct ospf6_prefix
+{
+  u_int8_t prefix_length;
+  u_int8_t prefix_options;
+  union {
+    u_int16_t _prefix_metric;
+    u_int16_t _prefix_referenced_lstype;
+  } u;
+#define prefix_metric        u._prefix_metric
+#define prefix_refer_lstype  u._prefix_referenced_lstype
+  /* followed by one address_prefix */
+};
+
+#define OSPF6_PREFIX_OPTION_NU (1 << 0)  /* No Unicast */
+#define OSPF6_PREFIX_OPTION_LA (1 << 1)  /* Local Address */
+#define OSPF6_PREFIX_OPTION_MC (1 << 2)  /* MultiCast */
+#define OSPF6_PREFIX_OPTION_P  (1 << 3)  /* Propagate (NSSA) */
+
+/* caddr_t OSPF6_PREFIX_BODY (struct ospf6_prefix *); */
+#define OSPF6_PREFIX_BODY(x) ((caddr_t)(x) + sizeof (struct ospf6_prefix))
+
+/* size_t OSPF6_PREFIX_SPACE (int prefixlength); */
+#define OSPF6_PREFIX_SPACE(x) ((((x) + 31) / 32) * 4)
+
+/* size_t OSPF6_PREFIX_SIZE (struct ospf6_prefix *); */
+#define OSPF6_PREFIX_SIZE(x) \
+   (OSPF6_PREFIX_SPACE ((x)->prefix_length) + sizeof (struct ospf6_prefix))
+
+/* struct ospf6_prefix *OSPF6_PREFIX_NEXT (struct ospf6_prefix *); */
+#define OSPF6_PREFIX_NEXT(x) \
+   ((struct ospf6_prefix *)((caddr_t)(x) + OSPF6_PREFIX_SIZE (x)))
+
+#define ospf6_prefix_in6_addr(in6, op)                         \
+do {                                                           \
+  memset (in6, 0, sizeof (struct in6_addr));                   \
+  memcpy (in6, (caddr_t) (op) + sizeof (struct ospf6_prefix),  \
+          OSPF6_PREFIX_SPACE ((op)->prefix_length));           \
+} while (0)
+
+void ospf6_prefix_apply_mask (struct ospf6_prefix *op);
+void ospf6_prefix_options_printbuf (u_int8_t prefix_options,
+                                    char *buf, int size);
+void ospf6_capability_printbuf (char capability, char *buf, int size);
+void ospf6_options_printbuf (char *options, char *buf, int size);
 
 #endif /* OSPF6_PROTO_H */