svn commit: r341999 - head/tests/sys/netpfil/pf

[Kristof Provost]

Author: kp
Date: Wed Dec 12 20:19:18 2018
New Revision: 341999
URL: https://svnweb.freebsd.org/changeset/base/341999

Log:
  pf tests: NAT exhaustion test
  
  It's been reported that pf doesn't handle running out of available ports
  for NAT correctly. It freezes until a state expires and it can find a
  free port.
  Test for this, by setting up a situation where only two ports are
  available for NAT and then attempting to create three connections.
  
  If successful the third connection will fail immediately. In an
  incorrect case the connection attempt will freeze, also freezing all
  interaction with pf through pfctl and trigger timeout.
  
  PR:		233867
  MFC after:	2 weeks

Added:
  head/tests/sys/netpfil/pf/nat.sh   (contents, props changed)
Modified:
  head/tests/sys/netpfil/pf/Makefile

Modified: head/tests/sys/netpfil/pf/Makefile
==============================================================================
--- head/tests/sys/netpfil/pf/Makefile	Wed Dec 12 20:15:06 2018	(r341998)
+++ head/tests/sys/netpfil/pf/Makefile	Wed Dec 12 20:19:18 2018	(r341999)
@@ -10,6 +10,7 @@ ATF_TESTS_SH+=	anchor \
 		forward \
 		fragmentation \
 		names \
+		nat \
 		set_tos \
 		route_to \
 		synproxy \

Added: head/tests/sys/netpfil/pf/nat.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/tests/sys/netpfil/pf/nat.sh	Wed Dec 12 20:19:18 2018	(r341999)
@@ -0,0 +1,64 @@
+# $FreeBSD$
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "exhaust" "cleanup"
+exhaust_head()
+{
+	atf_set descr 'Test exhausting the NAT pool'
+	atf_set require.user root
+}
+
+exhaust_body()
+{
+	pft_init
+
+	epair_nat=$(pft_mkepair)
+	epair_echo=$(pft_mkepair)
+
+	pft_mkjail nat ${epair_nat}b ${epair_echo}a
+	pft_mkjail echo ${epair_echo}b
+
+	ifconfig ${epair_nat}a 192.0.2.2/24 up
+	route add -net 198.51.100.0/24 192.0.2.1
+
+	jexec nat ifconfig ${epair_nat}b 192.0.2.1/24 up
+	jexec nat ifconfig ${epair_echo}a 198.51.100.1/24 up
+	jexec nat sysctl net.inet.ip.forwarding=1
+
+	jexec echo ifconfig ${epair_echo}b 198.51.100.2/24 up
+	jexec echo /usr/sbin/inetd $(atf_get_srcdir)/echo_inetd.conf
+
+	# Enable pf!
+	jexec nat pfctl -e
+	pft_set_rules nat \
+		"nat pass on ${epair_echo}a inet from 192.0.2.0/24 to any -> (${epair_echo}a) port 30000:30001 sticky-address"
+
+	# Sanity check
+	atf_check -s exit:0 -o ignore ping -c 3 198.51.100.2
+
+	echo "foo" | nc -N 198.51.100.2 7
+	echo "foo" | nc -N 198.51.100.2 7
+
+	# This one will fail, but that's expected
+	echo "foo" | nc -N 198.51.100.2 7 &
+
+	sleep 1
+
+	# If the kernel is stuck in pf_get_sport() this will not succeed either.
+	timeout 2 jexec nat pfctl -sa
+	if [ $? -eq 124 ]; then
+		# Timed out
+		atf_fail "pfctl timeout"
+	fi
+}
+
+exhaust_cleanup()
+{
+	pft_cleanup
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "exhaust"
+}