diff --git a/cddl/lib/libdtrace/Makefile b/cddl/lib/libdtrace/Makefile
index 7678db6329a8..17da1d806a22 100644
--- a/cddl/lib/libdtrace/Makefile
+++ b/cddl/lib/libdtrace/Makefile
@@ -50,6 +50,7 @@ DSRCS=		errno.d			\
 		io.d			\
 		ip.d			\
 		psinfo.d		\
+		siftr.d			\
 		signal.d		\
 		tcp.d			\
 		udp.d			\
diff --git a/cddl/lib/libdtrace/siftr.d b/cddl/lib/libdtrace/siftr.d
new file mode 100644
index 000000000000..a6ff844901dc
--- /dev/null
+++ b/cddl/lib/libdtrace/siftr.d
@@ -0,0 +1,100 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ *
+ * $FreeBSD$
+ */
+
+#pragma D depends_on module siftr
+#pragma D depends_on provider tcp
+
+/*
+ * Convert a SIFTR direction value to a string
+ */
+#pragma D binding "1.12.1" SIFTR_IN
+inline int SIFTR_IN =	1;
+#pragma D binding "1.12.1" SIFTR_OUT
+inline int SIFTR_OUT =	2;
+
+/* SIFTR direction strings. */
+#pragma D binding "1.12.1" siftr_dir_string
+inline string siftr_dir_string[uint8_t direction] =
+	direction == SIFTR_IN ?	"in" :
+	direction == SIFTR_OUT ? "out" :
+	"unknown" ;
+
+typedef struct siftrinfo {
+	struct timeval		tval;
+	uint8_t			direction;
+	uint8_t			ipver;
+	uint32_t		hash;
+	uint16_t		tcp_localport;
+	uint16_t		tcp_foreignport;
+	uint64_t		snd_cwnd;
+	u_long			snd_wnd;
+	u_long			rcv_wnd;
+	u_long			snd_bwnd;
+	u_long			snd_ssthresh;
+	int			conn_state;
+	u_int			max_seg_size;
+	int			smoothed_rtt;
+	u_char			sack_enabled;
+	u_char			snd_scale;
+	u_char			rcv_scale;
+	u_int			flags;
+	int			rxt_length;
+	u_int			snd_buf_hiwater;
+	u_int			snd_buf_cc;
+	u_int			rcv_buf_hiwater;
+	u_int			rcv_buf_cc;
+	u_int			sent_inflight_bytes;
+	int			t_segqlen;
+	u_int			flowid;
+	u_int			flowtype;
+} siftrinfo_t;
+
+#pragma D binding "1.12.1" translator
+translator siftrinfo_t < struct pkt_node *p > {
+	direction = 		p == NULL ? 0 : p->direction;
+	ipver =			p == NULL ? 0 : p->ipver;
+	hash = 			p == NULL ? 0 : p->hash;
+	tcp_localport =		p == NULL ? 0 : ntohs(p->tcp_localport);
+	tcp_foreignport =	p == NULL ? 0 : ntohs(p->tcp_foreignport);
+	snd_cwnd =		p == NULL ? 0 : p->snd_cwnd;
+	snd_wnd =		p == NULL ? 0 : p->snd_wnd;
+	rcv_wnd =		p == NULL ? 0 : p->rcv_wnd;
+	snd_bwnd =		p == NULL ? 0 : p->snd_bwnd;
+	snd_ssthresh =		p == NULL ? 0 : p->snd_ssthresh;
+	conn_state =		p == NULL ? 0 : p->conn_state;
+	max_seg_size = 		p == NULL ? 0 : p->max_seg_size;
+	smoothed_rtt =		p == NULL ? 0 : p->smoothed_rtt;
+	sack_enabled = 		p == NULL ? 0 : p->sack_enabled;
+	snd_scale =		p == NULL ? 0 : p->snd_scale;
+	rcv_scale =		p == NULL ? 0 : p->rcv_scale;
+	flags =			p == NULL ? 0 : p->flags;
+	rxt_length = 		p == NULL ? 0 : p->rxt_length;
+	snd_buf_hiwater =	p == NULL ? 0 : p->snd_buf_hiwater;
+	snd_buf_cc = 		p == NULL ? 0 : p->snd_buf_cc;
+	rcv_buf_hiwater = 	p == NULL ? 0 : p->rcv_buf_hiwater;
+	rcv_buf_cc = 		p == NULL ? 0 : p->rcv_buf_cc;
+	sent_inflight_bytes = 	p == NULL ? 0 : p->sent_inflight_bytes;
+	t_segqlen =		p == NULL ? 0 : p->t_segqlen;
+	flowid = 		p == NULL ? 0 : p->flowid;
+	flowtype = 		p == NULL ? 0 : p->flowtype;
+};