Index: etc/mtree/BSD.tests.dist
===================================================================
--- etc/mtree/BSD.tests.dist
+++ etc/mtree/BSD.tests.dist
@@ -836,6 +836,8 @@
         ..
         sys
         ..
+        tcptestsuite
+        ..
         vfs
         ..
         vm
Index: tests/sys/Makefile
===================================================================
--- tests/sys/Makefile
+++ tests/sys/Makefile
@@ -25,6 +25,7 @@
 TESTS_SUBDIRS+=		opencrypto
 TESTS_SUBDIRS+=		posixshm
 TESTS_SUBDIRS+=		sys
+TESTS_SUBDIRS+=		tcptestsuite
 TESTS_SUBDIRS+=		vfs
 TESTS_SUBDIRS+=		vm
 
Index: tests/sys/tcptestsuite/Makefile
===================================================================
--- /dev/null
+++ tests/sys/tcptestsuite/Makefile
@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+PACKAGE=	tests
+TESTSDIR=	${TESTSBASE}/sys/tcptestsuite
+${PACKAGE}FILESDIR=	${TESTSDIR}
+
+ATF_TESTS_SH+=	tcptestsuite_test
+${PACKAGE}FILES+=	blacklist
+
+.include <bsd.test.mk>
Index: tests/sys/tcptestsuite/tcptestsuite_test.sh
===================================================================
--- /dev/null
+++ tests/sys/tcptestsuite/tcptestsuite_test.sh
@@ -0,0 +1,80 @@
+#!/usr/bin/env atf-sh
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2019 Dell Inc.
+#
+# Written by:  Eric van Gyzen <vangyzen@FreeBSD.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+tcptestsuite_path=/usr/local/share/tcptestsuite
+packetdrill_path=/usr/local/bin/packetdrill
+
+make_script() {
+	if [ ! -d $tcptestsuite_path ]; then
+		# Generate a stub test that fails.
+		cat <<EOF
+		atf_test_case skip
+		skip_body() {
+			atf_skip "Install the tcptestsuite port/package."
+		}
+		atf_init_test_cases() {
+			atf_add_test_case skip
+		}
+EOF
+		return 1
+	fi
+	all_tests=$(mktemp -t tcptestsuite_test) || exit 1
+	(cd $tcptestsuite_path && find * -type f -and -name '*.pkt') | \
+	sed 's/\.pkt$//' | \
+	grep -vx blacklist > $all_tests
+
+	while read Torig; do
+		Tunder=$(basename $Torig | tr - _)
+		cat <<EOF
+		atf_test_case $Tunder
+		${Tunder}_body() {
+			atf_require_prog ${packetdrill_path}
+			atf_check -o ignore timeout 10 ${packetdrill_path} \
+			    ${tcptestsuite_path}/${Torig}.pkt
+			sleep 0.1
+		}
+
+EOF
+	done < $all_tests
+
+	echo 'atf_init_test_cases() {'
+	while read Torig; do
+		Tunder=$(basename $Torig | tr - _)
+		echo "	atf_add_test_case ${Tunder}"
+	done < $all_tests
+	echo '}'
+	rm $all_tests
+}
+
+atf_script=$(mktemp -t tcptestsuite_test) || exit 1
+make_script > $atf_script
+. $atf_script
+rm $atf_script