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// 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 "absl/synchronization/notification.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/capability_util.h"
#include "test/util/memory_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
using TestFunc = std::function<PosixError()>;
using RunFunc = std::function<PosixError(TestFunc)>;
struct NamespaceStrategy {
RunFunc run;
static NamespaceStrategy Of(RunFunc run) {
NamespaceStrategy s;
s.run = run;
return s;
}
};
PosixError RunWithUnshare(TestFunc fn) {
PosixError err = PosixError(-1, "function did not return a value");
ScopedThread t([&] {
if (unshare(CLONE_NEWNET) != 0) {
err = PosixError(errno);
return;
}
err = fn();
});
t.Join();
return err;
}
PosixError RunWithClone(TestFunc fn) {
struct Args {
absl::Notification n;
TestFunc fn;
PosixError err;
};
Args args;
args.fn = fn;
args.err = PosixError(-1, "function did not return a value");
ASSIGN_OR_RETURN_ERRNO(
Mapping child_stack,
MmapAnon(kPageSize, PROT_READ | PROT_WRITE, MAP_PRIVATE));
pid_t child = clone(
+[](void *arg) {
Args *args = reinterpret_cast<Args *>(arg);
args->err = args->fn();
args->n.Notify();
syscall(SYS_exit, 0); // Exit manually. No return address on stack.
return 0;
},
reinterpret_cast<void *>(child_stack.addr() + kPageSize),
CLONE_NEWNET | CLONE_THREAD | CLONE_SIGHAND | CLONE_VM, &args);
if (child < 0) {
return PosixError(errno, "clone() failed");
}
args.n.WaitForNotification();
return args.err;
}
class NetworkNamespaceTest
: public ::testing::TestWithParam<NamespaceStrategy> {};
TEST_P(NetworkNamespaceTest, LoopbackExists) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
EXPECT_NO_ERRNO(GetParam().run([]() {
// 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);
if (sock < 0) {
return PosixError(errno, "socket() failed");
}
struct ifreq ifr;
snprintf(ifr.ifr_name, IFNAMSIZ, "lo");
if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
return PosixError(errno, "ioctl() failed, lo cannot be found");
}
return NoError();
}));
}
INSTANTIATE_TEST_SUITE_P(
AllNetworkNamespaceTest, NetworkNamespaceTest,
::testing::Values(NamespaceStrategy::Of(RunWithUnshare),
NamespaceStrategy::Of(RunWithClone)));
} // namespace
} // namespace testing
} // namespace gvisor
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