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#!/usr/bin/python3
#
# Copyright 2018 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import unittest
import errno
from socket import *
import multinetwork_base
import net_test
_TEST_IP4_ADDR = "192.0.2.1"
_TEST_IP6_ADDR = "2001:db8::"
# Regression tests for interactions between kernel networking and netfilter
#
# These tests were added to ensure that the lookup path for local-ICMP errors
# do not cause failures. Specifically, local-ICMP packets do not have a
# net_device in the skb, and has been known to trigger bugs in surrounding code.
class NetilterRejectTargetTest(multinetwork_base.MultiNetworkBaseTest):
def setUp(self):
multinetwork_base.MultiNetworkBaseTest.setUp(self)
net_test.RunIptablesCommand(4, "-A OUTPUT -d " + _TEST_IP4_ADDR + " -j REJECT")
net_test.RunIptablesCommand(6, "-A OUTPUT -d " + _TEST_IP6_ADDR + " -j REJECT")
def tearDown(self):
net_test.RunIptablesCommand(4, "-D OUTPUT -d " + _TEST_IP4_ADDR + " -j REJECT")
net_test.RunIptablesCommand(6, "-D OUTPUT -d " + _TEST_IP6_ADDR + " -j REJECT")
multinetwork_base.MultiNetworkBaseTest.tearDown(self)
# Test a rejected TCP connect. The responding ICMP may not have skb->dev set.
# This tests the local-ICMP output-input path.
def CheckRejectedTcp(self, version, addr):
sock = net_test.TCPSocket(net_test.GetAddressFamily(version))
netid = self.RandomNetid()
self.SelectInterface(sock, netid, "mark")
# Expect this to fail with ICMP unreachable
try:
sock.connect((addr, 53))
except IOError:
pass
sock.close()
def testRejectTcp4(self):
self.CheckRejectedTcp(4, _TEST_IP4_ADDR)
def testRejectTcp6(self):
self.CheckRejectedTcp(6, _TEST_IP6_ADDR)
# Test a rejected UDP connect. The responding ICMP may not have skb->dev set.
# This tests the local-ICMP output-input path.
def CheckRejectedUdp(self, version, addr):
sock = net_test.UDPSocket(net_test.GetAddressFamily(version))
netid = self.RandomNetid()
self.SelectInterface(sock, netid, "mark")
# Expect this to fail with ICMP unreachable
try:
sock.sendto(net_test.UDP_PAYLOAD, (addr, 53))
except IOError:
pass
sock.close()
def testRejectUdp4(self):
self.CheckRejectedUdp(4, _TEST_IP4_ADDR)
def testRejectUdp6(self):
self.CheckRejectedUdp(6, _TEST_IP6_ADDR)
if __name__ == "__main__":
unittest.main()
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