diff --git a/usr.sbin/mrouted/mtrace.h b/usr.sbin/mrouted/mtrace.h
new file mode 100644
index 000000000000..1d704910475b
--- /dev/null
+++ b/usr.sbin/mrouted/mtrace.h
@@ -0,0 +1,87 @@
+/*
+ * Multicast traceroute related definitions
+ *
+ * mtrace.h,v 5.1 1996/12/19 21:31:26 fenner Exp
+ */
+
+/*
+ * The packet format for a traceroute request.
+ */
+struct tr_query {
+    u_int32  tr_src;		/* traceroute source */
+    u_int32  tr_dst;		/* traceroute destination */
+    u_int32  tr_raddr;		/* traceroute response address */
+#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
+    struct {
+	u_int	qid : 24;	/* traceroute query id */
+	u_int	ttl : 8;	/* traceroute response ttl */
+    } q;
+#else
+    struct {
+	u_int   ttl : 8;	/* traceroute response ttl */
+	u_int   qid : 24;	/* traceroute query id */
+    } q;
+#endif /* BYTE_ORDER */
+};
+
+#define tr_rttl q.ttl
+#define tr_qid  q.qid
+
+/*
+ * Traceroute response format.  A traceroute response has a tr_query at the
+ * beginning, followed by one tr_resp for each hop taken.
+ */
+struct tr_resp {
+    u_int32 tr_qarr;		/* query arrival time */
+    u_int32 tr_inaddr;		/* incoming interface address */
+    u_int32 tr_outaddr;		/* outgoing interface address */
+    u_int32 tr_rmtaddr;		/* parent address in source tree */
+    u_int32 tr_vifin;		/* input packet count on interface */
+    u_int32 tr_vifout;		/* output packet count on interface */
+    u_int32 tr_pktcnt;		/* total incoming packets for src-grp */
+    u_char  tr_rproto;		/* routing protocol deployed on router */
+    u_char  tr_fttl;		/* ttl required to forward on outvif */
+    u_char  tr_smask;		/* subnet mask for src addr */
+    u_char  tr_rflags;		/* forwarding error codes */
+};
+
+/* defs within mtrace */
+#define QUERY	1
+#define RESP	2
+#define QLEN	sizeof(struct tr_query)
+#define RLEN	sizeof(struct tr_resp)
+
+/* fields for tr_rflags (forwarding error codes) */
+#define TR_NO_ERR	0
+#define TR_WRONG_IF	1
+#define TR_PRUNED	2
+#define TR_OPRUNED	3
+#define TR_SCOPED	4
+#define TR_NO_RTE	5
+#define TR_NO_FWD	7
+#define TR_HIT_RP	8
+#define	TR_RPF_IF	9
+#define	TR_NO_MULTI	10
+#define TR_NO_SPACE	0x81
+#define TR_OLD_ROUTER	0x82
+#define	TR_ADMIN_PROHIB	0x83
+
+/* fields for tr_rproto (routing protocol) */
+#define PROTO_DVMRP		1
+#define PROTO_MOSPF		2
+#define PROTO_PIM		3
+#define PROTO_CBT		4
+#define PROTO_PIM_SPECIAL	5
+#define PROTO_PIM_STATIC	6
+#define PROTO_DVMRP_STATIC	7
+
+#define VAL_TO_MASK(x, i) { \
+			x = htonl(~((1 << (32 - (i))) - 1)); \
+			};
+
+#if defined(__STDC__) || defined(__GNUC__)
+#define JAN_1970	2208988800UL	/* 1970 - 1900 in seconds */
+#else
+#define JAN_1970	2208988800L	/* 1970 - 1900 in seconds */
+#define const		/**/
+#endif