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diff --git a/tests/sys/netpfil/pf/syncookie.sh b/tests/sys/netpfil/pf/syncookie.sh
--- a/tests/sys/netpfil/pf/syncookie.sh
+++ b/tests/sys/netpfil/pf/syncookie.sh
@@ -279,6 +279,62 @@
pft_cleanup
}
+atf_test_case "port_reuse" "cleanup"
+port_reuse_head()
+{
+ atf_set descr 'Test rapid port re-use'
+ atf_set require.user root
+}
+
+port_reuse_body()
+{
+ pft_init
+
+ epair=$(vnet_mkepair)
+
+ vnet_mkjail alcatraz ${epair}b
+ vnet_mkjail singsing
+ jexec alcatraz ifconfig ${epair}b 192.0.2.1/24 up
+ jexec alcatraz /usr/sbin/inetd -p ${HOME}/inetd-alcatraz.pid \
+ $(atf_get_srcdir)/echo_inetd.conf
+
+ ifconfig ${epair}a 192.0.2.2/24 up
+
+ jexec alcatraz pfctl -e
+ jexec alcatraz pfctl -x loud
+ pft_set_rules alcatraz \
+ "set syncookies always" \
+ "pass in" \
+ "pass out"
+
+ # Sanity check
+ atf_check -s exit:0 -o ignore ping -c 1 192.0.2.1
+
+ reply=$(echo foo | nc -p 1234 -N -w 5 192.0.2.1 7)
+ if [ "${reply}" != "foo" ];
+ then
+ atf_fail "Failed to connect to syncookie protected echo daemon"
+ fi
+
+ # We can't re-use the source IP/port combo quickly enough, so we're
+ # going to play a really dirty trick, and move our interface to a new
+ # jail, and do it from there.
+ ifconfig ${epair}a vnet singsing
+ jexec singsing ifconfig ${epair}a 192.0.2.2/24 up
+ atf_check -s exit:0 -o ignore jexec singsing ping -c 1 192.0.2.1
+
+ reply=$(echo bar | jexec singsing nc -p 1234 -N -w 5 192.0.2.1 7)
+ if [ "${reply}" != "bar" ];
+ then
+ atf_fail "Failed to connect to syncookie protected echo daemon (2)"
+ fi
+}
+
+port_reuse_cleanup()
+{
+ pft_cleanup
+}
+
atf_init_test_cases()
{
atf_add_test_case "basic"
@@ -286,4 +342,5 @@
atf_add_test_case "nostate"
atf_add_test_case "adaptive"
atf_add_test_case "limits"
+ atf_add_test_case "port_reuse"
}

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