Index: head/tests/sys/netpfil/pf/Makefile
===================================================================
--- head/tests/sys/netpfil/pf/Makefile	(revision 336296)
+++ head/tests/sys/netpfil/pf/Makefile	(revision 336297)
@@ -1,19 +1,21 @@
 # $FreeBSD$
 
 PACKAGE=	tests
 
 TESTSDIR=       ${TESTSBASE}/sys/netpfil/pf
 TESTS_SUBDIRS+=	ioctl
 
 ATF_TESTS_SH+=	pass_block \
 		forward \
 		fragmentation \
 		set_tos \
-		route_to
+		route_to \
+		synproxy
 
 ${PACKAGE}FILES+=	utils.subr \
+			echo_inetd.conf \
 			pft_ping.py
 
 ${PACKAGE}FILESMODE_pft_ping.py=	0555
 
 .include <bsd.test.mk>
Index: head/tests/sys/netpfil/pf/echo_inetd.conf
===================================================================
--- head/tests/sys/netpfil/pf/echo_inetd.conf	(nonexistent)
+++ head/tests/sys/netpfil/pf/echo_inetd.conf	(revision 336297)
@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+echo   stream  tcp     nowait  root    internal
+echo   stream  tcp6    nowait  root    internal
+echo   dgram   udp     wait    root    internal
+echo   dgram   udp6    wait    root    internal

Property changes on: head/tests/sys/netpfil/pf/echo_inetd.conf
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Index: head/tests/sys/netpfil/pf/synproxy.sh
===================================================================
--- head/tests/sys/netpfil/pf/synproxy.sh	(nonexistent)
+++ head/tests/sys/netpfil/pf/synproxy.sh	(revision 336297)
@@ -0,0 +1,59 @@
+# $FreeBSD$
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "synproxy" "cleanup"
+synproxy_head()
+{
+	atf_set descr 'Basic synproxy test'
+	atf_set require.user root
+}
+
+synproxy_body()
+{
+	pft_init
+
+	epair=$(pft_mkepair)
+	ifconfig ${epair}a 192.0.2.1/24 up
+	route add -net 198.51.100.0/24 192.0.2.2
+
+	link=$(pft_mkepair)
+
+	pft_mkjail alcatraz ${epair}b ${link}a
+	jexec alcatraz ifconfig ${epair}b 192.0.2.2/24 up
+	jexec alcatraz ifconfig ${link}a 198.51.100.1/24 up
+	jexec alcatraz sysctl net.inet.ip.forwarding=1
+
+	pft_mkjail singsing ${link}b
+	jexec singsing ifconfig ${link}b 198.51.100.2/24 up
+	jexec singsing route add default 198.51.100.1
+
+	jexec singsing /usr/sbin/inetd $(atf_get_srcdir)/echo_inetd.conf
+
+	jexec alcatraz pfctl -e
+	pft_set_rules alcatraz "set fail-policy return" \
+		"scrub in all fragment reassemble" \
+		"pass out quick on ${epair}b all no state allow-opts" \
+		"pass in quick on ${epair}b proto tcp from any to any port 7 synproxy state" \
+		"pass in quick on ${epair}b all no state"
+
+	# Sanity check, can we ping singing
+	atf_check -s exit:0 -o ignore ping -c 1 198.51.100.2
+
+	# Check that we can talk to the singsing jail, after synproxying
+	reply=$(echo ping | nc -N 198.51.100.2 7)
+	if [ "${reply}" != "ping" ];
+	then
+		atf_fail "echo failed"
+	fi
+}
+
+synproxy_cleanup()
+{
+	pft_cleanup
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "synproxy"
+}

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