Add a CTS test for multinetwork features.
For now, just checks that the kernel sysctls are present and
have the right permissions and expected values.
Bug: 15605143
Change-Id: I5feb6cb5f25b97e88cd0d9e8071213d13d4cc6e8
diff --git a/tests/cts/net/src/android/net/cts/MultinetworkTest.java b/tests/cts/net/src/android/net/cts/MultinetworkTest.java
new file mode 100644
index 0000000..256c030
--- /dev/null
+++ b/tests/cts/net/src/android/net/cts/MultinetworkTest.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+package android.net.cts;
+
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.OsConstants;
+import android.system.StructStat;
+import android.test.AndroidTestCase;
+
+import java.io.File;
+import java.io.FileDescriptor;
+import java.io.IOException;
+
+/**
+ * Tests for multinetwork functionality.
+ */
+public class MultinetworkTest extends AndroidTestCase {
+
+ // Global sysctls. Must be present and set to 1.
+ private static final String[] GLOBAL_SYSCTLS = {
+ "/proc/sys/net/ipv4/fwmark_reflect",
+ "/proc/sys/net/ipv6/fwmark_reflect",
+ "/proc/sys/net/ipv4/tcp_fwmark_accept",
+ };
+
+ // Per-interface IPv6 autoconf sysctls.
+ private static final String IPV6_SYSCTL_DIR = "/proc/sys/net/ipv6/conf";
+ private static final String AUTOCONF_SYSCTL = "accept_ra_rt_table";
+
+ // Expected mode, UID, and GID of sysctl files.
+ private static final int SYSCTL_MODE = 0100644;
+ private static final int SYSCTL_UID = 0;
+ private static final int SYSCTL_GID = 0;
+
+ private void checkSysctlPermissions(String fileName) throws ErrnoException {
+ StructStat stat = Os.stat(fileName);
+ assertEquals("mode of " + fileName + ":", SYSCTL_MODE, stat.st_mode);
+ assertEquals("UID of " + fileName + ":", SYSCTL_UID, stat.st_uid);
+ assertEquals("GID of " + fileName + ":", SYSCTL_GID, stat.st_gid);
+ }
+
+ private void assertLess(String what, int a, int b) {
+ assertTrue(what + " expected < " + b + " but was: " + a, a < b);
+ }
+
+ private String readFile(String fileName) throws ErrnoException, IOException {
+ byte[] buf = new byte[1024];
+ FileDescriptor fd = Os.open(fileName, 0, OsConstants.O_RDONLY);
+ int bytesRead = Os.read(fd, buf, 0, buf.length);
+ assertLess("length of " + fileName + ":", bytesRead, buf.length);
+ return new String(buf);
+ }
+
+ /**
+ * Checks that the sysctls for multinetwork kernel features are present and
+ * enabled. The necessary kernel commits are:
+ *
+ * Mainline Linux:
+ * e110861 net: add a sysctl to reflect the fwmark on replies
+ * 1b3c61d net: Use fwmark reflection in PMTU discovery.
+ * 84f39b0 net: support marking accepting TCP sockets
+ *
+ * Common Android tree (e.g., 3.10):
+ * a03f539 net: ipv6: autoconf routes into per-device tables
+ */
+ public void testProcFiles() throws ErrnoException, IOException, NumberFormatException {
+ for (String sysctl : GLOBAL_SYSCTLS) {
+ checkSysctlPermissions(sysctl);
+ int value = Integer.parseInt(readFile(sysctl).trim());
+ assertEquals("value of " + sysctl + ":", 1, value);
+ }
+
+ File[] interfaceDirs = new File(IPV6_SYSCTL_DIR).listFiles();
+ for (File interfaceDir : interfaceDirs) {
+ if (interfaceDir.getName().equals("all") || interfaceDir.getName().equals("lo")) {
+ continue;
+ }
+ String sysctl = new File(interfaceDir, AUTOCONF_SYSCTL).getAbsolutePath();
+ checkSysctlPermissions(sysctl);
+ int value = Integer.parseInt(readFile(sysctl).trim());
+ assertLess("value of " + sysctl + ":", value, 0);
+ }
+ }
+}