Merge branch 'master' into ip-forwarding

- Merges aleksej-paschenko's with HEAD
- Adds vfs2 support for ip_forward

1 files changed, 52 insertions, 0 deletions

diff --git a/test/syscalls/linux/network_namespace.cc b/test/syscalls/linux/network_namespace.cc
new file mode 100644
index 000000000..133fdecf0
--- /dev/null
+++ b/test/syscalls/linux/network_namespace.cc
@@ -0,0 +1,52 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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.
+
+#include <net/if.h>
+#include <sched.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/util/capability_util.h"
+#include "test/util/posix_error.h"
+#include "test/util/test_util.h"
+#include "test/util/thread_util.h"
+
+namespace gvisor {
+namespace testing {
+namespace {
+
+TEST(NetworkNamespaceTest, LoopbackExists) {
+  SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
+
+  ScopedThread t([&] {
+    ASSERT_THAT(unshare(CLONE_NEWNET), SyscallSucceedsWithValue(0));
+
+    // TODO(gvisor.dev/issue/1833): Update this to test that only "lo" exists.
+    // Check loopback device exists.
+    int sock = socket(AF_INET, SOCK_DGRAM, 0);
+    ASSERT_THAT(sock, SyscallSucceeds());
+    struct ifreq ifr;
+    strncpy(ifr.ifr_name, "lo", IFNAMSIZ);
+    EXPECT_THAT(ioctl(sock, SIOCGIFINDEX, &ifr), SyscallSucceeds())
+        << "lo cannot be found";
+  });
+}
+
+}  // namespace
+}  // namespace testing
+}  // namespace gvisor