diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 51a0496f..a93680fc 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -105,6 +105,7 @@ enum tca_id {
 	TCA_ID_IFE = TCA_ACT_IFE,
 	TCA_ID_SAMPLE = TCA_ACT_SAMPLE,
 	/* other actions go here */
+	TCA_ID_CTINFO,
 	__TCA_ID_MAX = 255
 };
 
diff --git a/include/uapi/linux/tc_act/tc_ctinfo.h b/include/uapi/linux/tc_act/tc_ctinfo.h
new file mode 100644
index 00000000..da803e05
--- /dev/null
+++ b/include/uapi/linux/tc_act/tc_ctinfo.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __UAPI_TC_CTINFO_H
+#define __UAPI_TC_CTINFO_H
+
+#include <linux/types.h>
+#include <linux/pkt_cls.h>
+
+struct tc_ctinfo {
+	tc_gen;
+};
+
+enum {
+	TCA_CTINFO_UNSPEC,
+	TCA_CTINFO_PAD,
+	TCA_CTINFO_TM,
+	TCA_CTINFO_ACT,
+	TCA_CTINFO_ZONE,
+	TCA_CTINFO_PARMS_DSCP_MASK,
+	TCA_CTINFO_PARMS_DSCP_STATEMASK,
+	TCA_CTINFO_PARMS_CPMARK_MASK,
+	TCA_CTINFO_STATS_DSCP_SET,
+	TCA_CTINFO_STATS_DSCP_ERROR,
+	TCA_CTINFO_STATS_CPMARK_SET,
+	__TCA_CTINFO_MAX
+};
+
+#define TCA_CTINFO_MAX (__TCA_CTINFO_MAX - 1)
+
+enum {
+	CTINFO_MODE_DSCP	= BIT(0),
+	CTINFO_MODE_CPMARK	= BIT(1)
+};
+
+#endif
diff --git a/tc/Makefile b/tc/Makefile
index 1a305cf4..60abddee 100644
--- a/tc/Makefile
+++ b/tc/Makefile
@@ -48,6 +48,7 @@ TCMODULES += m_csum.o
 TCMODULES += m_simple.o
 TCMODULES += m_vlan.o
 TCMODULES += m_connmark.o
+TCMODULES += m_ctinfo.o
 TCMODULES += m_bpf.o
 TCMODULES += m_tunnel_key.o
 TCMODULES += m_sample.o
diff --git a/tc/m_ctinfo.c b/tc/m_ctinfo.c
new file mode 100644
index 00000000..5e451f87
--- /dev/null
+++ b/tc/m_ctinfo.c
@@ -0,0 +1,268 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * m_ctinfo.c		netfilter ctinfo mark action
+ *
+ * Copyright (c) 2019 Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include "utils.h"
+#include "tc_util.h"
+#include <linux/tc_act/tc_ctinfo.h>
+
+static void
+explain(void)
+{
+	fprintf(stderr,
+		"Usage: ... ctinfo [dscp mask [statemask]] [cpmark [mask]] [zone ZONE] [CONTROL] [index <INDEX>]\n"
+		"where :\n"
+		"\tdscp   MASK bitmask location of stored DSCP\n"
+		"\t       STATEMASK bitmask to determine conditional restoring\n"
+		"\tcpmark MASK mask applied to mark on restoration\n"
+		"\tZONE is the conntrack zone\n"
+		"\tCONTROL := reclassify | pipe | drop | continue | ok |\n"
+		"\t           goto chain <CHAIN_INDEX>\n");
+}
+
+static void
+usage(void)
+{
+	explain();
+	exit(-1);
+}
+
+static int
+parse_ctinfo(struct action_util *a, int *argc_p, char ***argv_p, int tca_id,
+	     struct nlmsghdr *n)
+{
+	unsigned int cpmarkmask = 0, dscpmask = 0, dscpstatemask = 0;
+	struct tc_ctinfo sel = {};
+	unsigned short zone = 0;
+	char **argv = *argv_p;
+	struct rtattr *tail;
+	int argc = *argc_p;
+	int ok = 0;
+	__u8 i;
+
+	while (argc > 0) {
+		if (matches(*argv, "ctinfo") == 0) {
+			ok = 1;
+			NEXT_ARG_FWD();
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+		} else {
+			break;
+		}
+
+	}
+
+	if (!ok) {
+		explain();
+		return -1;
+	}
+
+	if (argc) {
+		if (matches(*argv, "dscp") == 0) {
+			NEXT_ARG();
+			if (get_u32(&dscpmask, *argv, 0)) {
+				fprintf(stderr,
+					"ctinfo: Illegal dscp \"mask\"\n");
+				return -1;
+			}
+			if (NEXT_ARG_OK()) {
+				NEXT_ARG_FWD();
+				if (!get_u32(&dscpstatemask, *argv, 0))
+					NEXT_ARG_FWD(); /* was a statemask */
+			} else {
+				NEXT_ARG_FWD();
+			}
+		}
+	}
+
+	/* cpmark has optional mask parameter, so the next arg might not  */
+	/* exist, or it might be the next option, or it may actually be a */
+	/* 32bit mask */
+	if (argc) {
+		if (matches(*argv, "cpmark") == 0) {
+			cpmarkmask = ~0;
+			if (NEXT_ARG_OK()) {
+				NEXT_ARG_FWD();
+				if (!get_u32(&cpmarkmask, *argv, 0))
+					NEXT_ARG_FWD(); /* was a mask */
+			} else {
+				NEXT_ARG_FWD();
+			}
+		}
+	}
+
+	if (argc) {
+		if (matches(*argv, "zone") == 0) {
+			NEXT_ARG();
+			if (get_u16(&zone, *argv, 10)) {
+				fprintf(stderr, "ctinfo: Illegal \"zone\"\n");
+				return -1;
+			}
+			NEXT_ARG_FWD();
+		}
+	}
+
+	parse_action_control_dflt(&argc, &argv, &sel.action,
+				  false, TC_ACT_PIPE);
+
+	if (argc) {
+		if (matches(*argv, "index") == 0) {
+			NEXT_ARG();
+			if (get_u32(&sel.index, *argv, 10)) {
+				fprintf(stderr, "ctinfo: Illegal \"index\"\n");
+				return -1;
+			}
+			NEXT_ARG_FWD();
+		}
+	}
+
+	if (dscpmask & dscpstatemask) {
+		fprintf(stderr,
+			"ctinfo: dscp mask & statemask must NOT overlap\n");
+		return -1;
+	}
+
+	i = ffs(dscpmask);
+	if (i && ((~0 & (dscpmask >> (i - 1))) != 0x3f)) {
+		fprintf(stderr,
+			"ctinfo: dscp mask must be 6 contiguous bits long\n");
+		return -1;
+	}
+
+	tail = addattr_nest(n, MAX_MSG, tca_id);
+	addattr_l(n, MAX_MSG, TCA_CTINFO_ACT, &sel, sizeof(sel));
+	addattr16(n, MAX_MSG, TCA_CTINFO_ZONE, zone);
+
+	if (dscpmask)
+		addattr32(n, MAX_MSG,
+			  TCA_CTINFO_PARMS_DSCP_MASK, dscpmask);
+
+	if (dscpstatemask)
+		addattr32(n, MAX_MSG,
+			  TCA_CTINFO_PARMS_DSCP_STATEMASK, dscpstatemask);
+
+	if (cpmarkmask)
+		addattr32(n, MAX_MSG,
+			  TCA_CTINFO_PARMS_CPMARK_MASK, cpmarkmask);
+
+	addattr_nest_end(n, tail);
+
+	*argc_p = argc;
+	*argv_p = argv;
+	return 0;
+}
+
+static void print_ctinfo_stats(FILE *f, struct rtattr *tb[TCA_CTINFO_MAX + 1])
+{
+	struct tcf_t *tm;
+
+	if (tb[TCA_CTINFO_TM]) {
+		tm = RTA_DATA(tb[TCA_CTINFO_TM]);
+
+		print_tm(f, tm);
+	}
+
+	if (tb[TCA_CTINFO_STATS_DSCP_SET])
+		print_lluint(PRINT_ANY, "dscpset", " DSCP set %llu",
+			     rta_getattr_u64(tb[TCA_CTINFO_STATS_DSCP_SET]));
+	if (tb[TCA_CTINFO_STATS_DSCP_ERROR])
+		print_lluint(PRINT_ANY, "dscperror", " error %llu",
+			     rta_getattr_u64(tb[TCA_CTINFO_STATS_DSCP_ERROR]));
+
+	if (tb[TCA_CTINFO_STATS_CPMARK_SET])
+		print_lluint(PRINT_ANY, "cpmarkset", " CPMARK set %llu",
+			     rta_getattr_u64(tb[TCA_CTINFO_STATS_CPMARK_SET]));
+}
+
+static int print_ctinfo(struct action_util *au, FILE *f, struct rtattr *arg)
+{
+	unsigned int cpmarkmask = ~0, dscpmask = 0, dscpstatemask = 0;
+	struct rtattr *tb[TCA_CTINFO_MAX + 1];
+	unsigned short zone = 0;
+	struct tc_ctinfo *ci;
+
+	if (arg == NULL)
+		return -1;
+
+	parse_rtattr_nested(tb, TCA_CTINFO_MAX, arg);
+	if (!tb[TCA_CTINFO_ACT]) {
+		print_string(PRINT_FP, NULL, "%s",
+			     "[NULL ctinfo action parameters]");
+		return -1;
+	}
+
+	ci = RTA_DATA(tb[TCA_CTINFO_ACT]);
+
+	if (tb[TCA_CTINFO_PARMS_DSCP_MASK]) {
+		if (RTA_PAYLOAD(tb[TCA_CTINFO_PARMS_DSCP_MASK]) >=
+		    sizeof(__u32))
+			dscpmask = rta_getattr_u32(
+					tb[TCA_CTINFO_PARMS_DSCP_MASK]);
+		else
+			print_string(PRINT_FP, NULL, "%s",
+				     "[invalid dscp mask parameter]");
+	}
+
+	if (tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) {
+		if (RTA_PAYLOAD(tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) >=
+		    sizeof(__u32))
+			dscpstatemask = rta_getattr_u32(
+					tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]);
+		else
+			print_string(PRINT_FP, NULL, "%s",
+				     "[invalid dscp statemask parameter]");
+	}
+
+	if (tb[TCA_CTINFO_PARMS_CPMARK_MASK]) {
+		if (RTA_PAYLOAD(tb[TCA_CTINFO_PARMS_CPMARK_MASK]) >=
+		    sizeof(__u32))
+			cpmarkmask = rta_getattr_u32(
+					tb[TCA_CTINFO_PARMS_CPMARK_MASK]);
+		else
+			print_string(PRINT_FP, NULL, "%s",
+				     "[invalid cpmark mask parameter]");
+	}
+
+	if (tb[TCA_CTINFO_ZONE] && RTA_PAYLOAD(tb[TCA_CTINFO_ZONE]) >=
+	    sizeof(__u16))
+		zone = rta_getattr_u16(tb[TCA_CTINFO_ZONE]);
+
+	print_string(PRINT_ANY, "kind", "%s ", "ctinfo");
+	print_hu(PRINT_ANY, "zone", "zone %u", zone);
+	print_action_control(f, " ", ci->action, "");
+
+	print_string(PRINT_FP, NULL, "%s", _SL_);
+	print_uint(PRINT_ANY, "index", "\t index %u", ci->index);
+	print_int(PRINT_ANY, "ref", " ref %d", ci->refcnt);
+	print_int(PRINT_ANY, "bind", " bind %d", ci->bindcnt);
+
+	if (tb[TCA_CTINFO_PARMS_DSCP_MASK]) {
+		print_0xhex(PRINT_ANY, "dscpmask", " dscp %#010llx", dscpmask);
+		print_0xhex(PRINT_ANY, "dscpstatemask", " %#010llx",
+			    dscpstatemask);
+	}
+
+	if (tb[TCA_CTINFO_PARMS_CPMARK_MASK])
+		print_0xhex(PRINT_ANY, "cpmark", " cpmark %#010llx",
+			    cpmarkmask);
+
+	if (show_stats)
+		print_ctinfo_stats(f, tb);
+
+	print_string(PRINT_FP, NULL, "%s", _SL_);
+
+	return 0;
+}
+
+struct action_util ctinfo_action_util = {
+	.id = "ctinfo",
+	.parse_aopt = parse_ctinfo,
+	.print_aopt = print_ctinfo,
+};
