tests: Add an FTP test without conntrack.

If FTP tests with conntrack fail, it is informative to know if the
problem is with the FTP client and/or server, or with conntrack
itself.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>

tests/system-traffic.at

@@ -2040,6 +2040,35 @@ tcp,orig=(src=10.1.1.1,dst=10.1.1.2,sport=<cleared>,dport=<cleared>),reply=(src=
 OVS_TRAFFIC_VSWITCHD_STOP
 AT_CLEANUP
 
+AT_SETUP([FTP - no conntrack])
+AT_SKIP_IF([test $HAVE_PYFTPDLIB = no])
+OVS_TRAFFIC_VSWITCHD_START()
+
+ADD_NAMESPACES(at_ns0, at_ns1)
+
+ADD_VETH(p0, at_ns0, br0, "10.1.1.1/24")
+ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24")
+
+AT_DATA([flows.txt], [dnl
+table=0,action=normal
+])
+
+AT_CHECK([ovs-ofctl --bundle replace-flows br0 flows.txt])
+
+NETNS_DAEMONIZE([at_ns0], [[$PYTHON $srcdir/test-l7.py ftp]], [ftp1.pid])
+NETNS_DAEMONIZE([at_ns1], [[$PYTHON $srcdir/test-l7.py ftp]], [ftp0.pid])
+OVS_WAIT_UNTIL([ip netns exec at_ns1 netstat -l | grep ftp])
+
+dnl FTP requests from p0->p1 should work fine.
+NS_CHECK_EXEC([at_ns0], [wget ftp://10.1.1.2 --no-passive-ftp -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+
+AT_CHECK([find -name index.html], [0], [dnl
+./index.html
+])
+
+OVS_TRAFFIC_VSWITCHD_STOP
+AT_CLEANUP
+
 AT_SETUP([conntrack - FTP])
 AT_SKIP_IF([test $HAVE_FTP = no])
 CHECK_CONNTRACK()