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gvisor/test/syscalls/linux/socket_inet_loopback.cc

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// Copyright 2018 Google LLC
//
// 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 <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include <atomic>
#include <iostream>
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "absl/time/time.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/posix_error.h"
#include "test/util/save_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
PosixErrorOr<uint16_t> AddrPort(int family, sockaddr_storage const& addr) {
switch (family) {
case AF_INET:
return static_cast<uint16_t>(
reinterpret_cast<sockaddr_in const*>(&addr)->sin_port);
case AF_INET6:
return static_cast<uint16_t>(
reinterpret_cast<sockaddr_in6 const*>(&addr)->sin6_port);
default:
return PosixError(EINVAL,
absl::StrCat("unknown socket family: ", family));
}
}
PosixError SetAddrPort(int family, sockaddr_storage* addr, uint16_t port) {
switch (family) {
case AF_INET:
reinterpret_cast<sockaddr_in*>(addr)->sin_port = port;
return NoError();
case AF_INET6:
reinterpret_cast<sockaddr_in6*>(addr)->sin6_port = port;
return NoError();
default:
return PosixError(EINVAL,
absl::StrCat("unknown socket family: ", family));
}
}
struct TestParam {
TestAddress listener;
TestAddress connector;
};
std::string DescribeTestParam(::testing::TestParamInfo<TestParam> const& info) {
return absl::StrCat("Listen", info.param.listener.description, "_Connect",
info.param.connector.description);
}
using SocketInetLoopbackTest = ::testing::TestWithParam<TestParam>;
TEST(BadSocketPairArgs, ValidateErrForBadCallsToSocketPair) {
int fd[2] = {};
// Valid AF but invalid for socketpair(2) return ESOCKTNOSUPPORT.
ASSERT_THAT(socketpair(AF_INET, 0, 0, fd),
SyscallFailsWithErrno(ESOCKTNOSUPPORT));
ASSERT_THAT(socketpair(AF_INET6, 0, 0, fd),
SyscallFailsWithErrno(ESOCKTNOSUPPORT));
// Invalid AF will return ENOAFSUPPORT.
ASSERT_THAT(socketpair(AF_MAX, 0, 0, fd),
SyscallFailsWithErrno(EAFNOSUPPORT));
ASSERT_THAT(socketpair(8675309, 0, 0, fd),
SyscallFailsWithErrno(EAFNOSUPPORT));
}
TEST_P(SocketInetLoopbackTest, TCP) {
auto const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(bind(listen_fd.get(), reinterpret_cast<sockaddr*>(&listen_addr),
listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(),
reinterpret_cast<sockaddr*>(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect to the listening socket.
const FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(),
reinterpret_cast<sockaddr*>(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Accept the connection.
//
// We have to assign a name to the accepted socket, as unamed temporary
// objects are destructed upon full evaluation of the expression it is in,
// potentially causing the connecting socket to fail to shutdown properly.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
ASSERT_THAT(shutdown(listen_fd.get(), SHUT_RDWR), SyscallSucceeds());
ASSERT_THAT(shutdown(conn_fd.get(), SHUT_RDWR), SyscallSucceeds());
}
INSTANTIATE_TEST_SUITE_P(
All, SocketInetLoopbackTest,
::testing::Values(
// Listeners bound to IPv4 addresses refuse connections using IPv6
// addresses.
TestParam{V4Any(), V4Any()}, TestParam{V4Any(), V4Loopback()},
TestParam{V4Any(), V4MappedAny()},
TestParam{V4Any(), V4MappedLoopback()},
TestParam{V4Loopback(), V4Any()}, TestParam{V4Loopback(), V4Loopback()},
TestParam{V4Loopback(), V4MappedLoopback()},
TestParam{V4MappedAny(), V4Any()},
TestParam{V4MappedAny(), V4Loopback()},
TestParam{V4MappedAny(), V4MappedAny()},
TestParam{V4MappedAny(), V4MappedLoopback()},
TestParam{V4MappedLoopback(), V4Any()},
TestParam{V4MappedLoopback(), V4Loopback()},
TestParam{V4MappedLoopback(), V4MappedLoopback()},
// Listeners bound to IN6ADDR_ANY accept all connections.
TestParam{V6Any(), V4Any()}, TestParam{V6Any(), V4Loopback()},
TestParam{V6Any(), V4MappedAny()},
TestParam{V6Any(), V4MappedLoopback()}, TestParam{V6Any(), V6Any()},
TestParam{V6Any(), V6Loopback()},
// Listeners bound to IN6ADDR_LOOPBACK refuse connections using IPv4
// addresses.
TestParam{V6Loopback(), V6Any()},
TestParam{V6Loopback(), V6Loopback()}),
DescribeTestParam);
using SocketInetReusePortTest = ::testing::TestWithParam<TestParam>;
TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
auto const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
sockaddr_storage listen_addr = listener.addr;
sockaddr_storage conn_addr = connector.addr;
constexpr int kThreadCount = 3;
// Create the listening socket.
FileDescriptor listener_fds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
listener_fds[i] = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
int fd = listener_fds[i].get();
ASSERT_THAT(setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(fd, reinterpret_cast<sockaddr*>(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(fd, 40), SyscallSucceeds());
// On the first bind we need to determine which port was bound.
if (i != 0) {
continue;
}
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listener_fds[0].get(),
reinterpret_cast<sockaddr*>(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
ASSERT_NO_ERRNO(SetAddrPort(listener.family(), &listen_addr, port));
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
}
constexpr int kConnectAttempts = 10000;
std::atomic<int> connects_received = ATOMIC_VAR_INIT(0);
std::unique_ptr<ScopedThread> listen_thread[kThreadCount];
int accept_counts[kThreadCount] = {};
// TODO(avagin): figure how to not disable S/R for the whole test.
// We need to take into account that this test executes a lot of system
// calls from many threads.
DisableSave ds;
for (int i = 0; i < kThreadCount; i++) {
listen_thread[i] = absl::make_unique<ScopedThread>(
[&listener_fds, &accept_counts, i, &connects_received]() {
do {
auto fd = Accept(listener_fds[i].get(), nullptr, nullptr);
if (!fd.ok()) {
if (connects_received >= kConnectAttempts) {
// Another thread have shutdown our read side causing the
// accept to fail.
break;
}
ASSERT_NO_ERRNO(fd);
break;
}
// Receive some data from a socket to be sure that the connect()
// system call has been completed on another side.
int data;
EXPECT_THAT(
RetryEINTR(recv)(fd.ValueOrDie().get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(sizeof(data)));
accept_counts[i]++;
} while (++connects_received < kConnectAttempts);
// Shutdown all sockets to wake up other threads.
for (int j = 0; j < kThreadCount; j++) {
shutdown(listener_fds[j].get(), SHUT_RDWR);
}
});
}
ScopedThread connecting_thread([&connector, &conn_addr]() {
for (int i = 0; i < kConnectAttempts; i++) {
const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(
RetryEINTR(connect)(fd.get(), reinterpret_cast<sockaddr*>(&conn_addr),
connector.addr_len),
SyscallSucceeds());
EXPECT_THAT(RetryEINTR(send)(fd.get(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
}
});
// Join threads to be sure that all connections have been counted
connecting_thread.Join();
for (int i = 0; i < kThreadCount; i++) {
listen_thread[i]->Join();
}
// Check that connections are distributed fairly between listening sockets
for (int i = 0; i < kThreadCount; i++)
EXPECT_THAT(accept_counts[i],
EquivalentWithin((kConnectAttempts / kThreadCount), 0.10));
}
TEST_P(SocketInetReusePortTest, UdpPortReuseMultiThread) {
auto const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
sockaddr_storage listen_addr = listener.addr;
sockaddr_storage conn_addr = connector.addr;
constexpr int kThreadCount = 3;
// Create the listening socket.
FileDescriptor listener_fds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
listener_fds[i] =
ASSERT_NO_ERRNO_AND_VALUE(Socket(listener.family(), SOCK_DGRAM, 0));
int fd = listener_fds[i].get();
ASSERT_THAT(setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(fd, reinterpret_cast<sockaddr*>(&listen_addr), listener.addr_len),
SyscallSucceeds());
// On the first bind we need to determine which port was bound.
if (i != 0) {
continue;
}
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listener_fds[0].get(),
reinterpret_cast<sockaddr*>(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
ASSERT_NO_ERRNO(SetAddrPort(listener.family(), &listen_addr, port));
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
}
constexpr int kConnectAttempts = 10000;
std::atomic<int> packets_received = ATOMIC_VAR_INIT(0);
std::unique_ptr<ScopedThread> receiver_thread[kThreadCount];
int packets_per_socket[kThreadCount] = {};
// TODO(avagin): figure how to not disable S/R for the whole test.
DisableSave ds; // Too expensive.
for (int i = 0; i < kThreadCount; i++) {
receiver_thread[i] = absl::make_unique<ScopedThread>(
[&listener_fds, &packets_per_socket, i, &packets_received]() {
do {
struct sockaddr_storage addr = {};
socklen_t addrlen = sizeof(addr);
int data;
auto ret = RetryEINTR(recvfrom)(
listener_fds[i].get(), &data, sizeof(data), 0,
reinterpret_cast<struct sockaddr*>(&addr), &addrlen);
if (packets_received < kConnectAttempts) {
ASSERT_THAT(ret, SyscallSucceedsWithValue(sizeof(data)));
}
if (ret != sizeof(data)) {
// Another thread may have shutdown our read side causing the
// recvfrom to fail.
break;
}
packets_received++;
packets_per_socket[i]++;
// A response is required to synchronize with the main thread,
// otherwise the main thread can send more than can fit into receive
// queues.
EXPECT_THAT(RetryEINTR(sendto)(
listener_fds[i].get(), &data, sizeof(data), 0,
reinterpret_cast<sockaddr*>(&addr), addrlen),
SyscallSucceedsWithValue(sizeof(data)));
} while (packets_received < kConnectAttempts);
// Shutdown all sockets to wake up other threads.
for (int j = 0; j < kThreadCount; j++)
shutdown(listener_fds[j].get(), SHUT_RDWR);
});
}
ScopedThread main_thread([&connector, &conn_addr]() {
for (int i = 0; i < kConnectAttempts; i++) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(connector.family(), SOCK_DGRAM, 0));
EXPECT_THAT(RetryEINTR(sendto)(fd.get(), &i, sizeof(i), 0,
reinterpret_cast<sockaddr*>(&conn_addr),
connector.addr_len),
SyscallSucceedsWithValue(sizeof(i)));
int data;
EXPECT_THAT(RetryEINTR(recv)(fd.get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(sizeof(data)));
}
});
main_thread.Join();
// Join threads to be sure that all connections have been counted
for (int i = 0; i < kThreadCount; i++) {
receiver_thread[i]->Join();
}
// Check that packets are distributed fairly between listening sockets.
for (int i = 0; i < kThreadCount; i++)
EXPECT_THAT(packets_per_socket[i],
EquivalentWithin((kConnectAttempts / kThreadCount), 0.10));
}
INSTANTIATE_TEST_SUITE_P(
All, SocketInetReusePortTest,
::testing::Values(
// Listeners bound to IPv4 addresses refuse connections using IPv6
// addresses.
TestParam{V4Any(), V4Loopback()},
TestParam{V4Loopback(), V4MappedLoopback()},
// Listeners bound to IN6ADDR_ANY accept all connections.
TestParam{V6Any(), V4Loopback()}, TestParam{V6Any(), V6Loopback()},
// Listeners bound to IN6ADDR_LOOPBACK refuse connections using IPv4
// addresses.
TestParam{V6Loopback(), V6Loopback()}),
DescribeTestParam);
struct ProtocolTestParam {
std::string description;
int type;
};
std::string DescribeProtocolTestParam(
::testing::TestParamInfo<ProtocolTestParam> const& info) {
return info.param.description;
}
using SocketMultiProtocolInetLoopbackTest =
::testing::TestWithParam<ProtocolTestParam>;
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedLoopbackOnlyReservesV4) {
auto const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 loopback on a dual stack socket.
TestAddress const& test_addr_dual = V4MappedLoopback();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(bind(fd_dual.get(), reinterpret_cast<sockaddr*>(&addr_dual),
test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(),
reinterpret_cast<sockaddr*>(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
int ret = bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// Verify that binding the v4 loopback with the same port on a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), reinterpret_cast<sockaddr*>(&addr_v4),
test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedAnyOnlyReservesV4) {
auto const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 any on a dual stack socket.
TestAddress const& test_addr_dual = V4MappedAny();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(bind(fd_dual.get(), reinterpret_cast<sockaddr*>(&addr_dual),
test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(),
reinterpret_cast<sockaddr*>(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
int ret = bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// Verify that binding the v4 loopback with the same port on a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), reinterpret_cast<sockaddr*>(&addr_v4),
test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, DualStackV6AnyReservesEverything) {
auto const& param = GetParam();
// Bind the v6 any on a dual stack socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(bind(fd_dual.get(), reinterpret_cast<sockaddr*>(&addr_dual),
test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(),
reinterpret_cast<sockaddr*>(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v6 socket
// fails.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped, port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
ASSERT_THAT(
bind(fd_v4_mapped.get(), reinterpret_cast<sockaddr*>(&addr_v4_mapped),
test_addr_v4_mapped.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), reinterpret_cast<sockaddr*>(&addr_v4),
test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V6OnlyV6AnyReservesV6) {
auto const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v6 any on a v6-only socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
int one = 1;
EXPECT_THAT(
setsockopt(fd_dual.get(), IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one)),
SyscallSucceeds());
ASSERT_THAT(bind(fd_dual.get(), reinterpret_cast<sockaddr*>(&addr_dual),
test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(),
reinterpret_cast<sockaddr*>(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that we can still bind the v4 loopback on the same port.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped, port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
int ret =
bind(fd_v4_mapped.get(), reinterpret_cast<sockaddr*>(&addr_v4_mapped),
test_addr_v4_mapped.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V6EphemeralPortReserved) {
auto const& param = GetParam();
// FIXME(b/114268588)
SKIP_IF(IsRunningOnGvisor() && param.type == SOCK_STREAM);
for (int i = 0; true; i++) {
// Bind the v6 loopback on a dual stack socket.
TestAddress const& test_addr = V6Loopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(bind(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
&bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
connect(connected_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(),
reinterpret_cast<sockaddr*>(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(
bind(checking_fd.get(), reinterpret_cast<sockaddr*>(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 any with the same port fails.
TestAddress const& test_addr_v4_any = V4Any();
sockaddr_storage addr_v4_any = test_addr_v4_any.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_any.family(), &addr_v4_any, ephemeral_port));
const FileDescriptor fd_v4_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4_any.get(), reinterpret_cast<sockaddr*>(&addr_v4_any),
test_addr_v4_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that we can still bind the v4 loopback on the same port.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped,
ephemeral_port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
int ret =
bind(fd_v4_mapped.get(), reinterpret_cast<sockaddr*>(&addr_v4_mapped),
test_addr_v4_mapped.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedEphemeralPortReserved) {
auto const& param = GetParam();
// FIXME(b/114268588)
SKIP_IF(IsRunningOnGvisor() && param.type == SOCK_STREAM);
for (int i = 0; true; i++) {
// Bind the v4 loopback on a dual stack socket.
TestAddress const& test_addr = V4MappedLoopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(bind(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
&bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
connect(connected_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(),
reinterpret_cast<sockaddr*>(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(
bind(checking_fd.get(), reinterpret_cast<sockaddr*>(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4.family(), &addr_v4, ephemeral_port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
EXPECT_THAT(bind(fd_v4.get(), reinterpret_cast<sockaddr*>(&addr_v4),
test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 any on the same port with a dual-stack socket
// fails.
TestAddress const& test_addr_v6_any = V6Any();
sockaddr_storage addr_v6_any = test_addr_v6_any.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6_any.family(), &addr_v6_any, ephemeral_port));
const FileDescriptor fd_v6_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6_any.get(), reinterpret_cast<sockaddr*>(&addr_v6_any),
test_addr_v6_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// For some reason, binding the TCP v6-only any is flaky on Linux. Maybe we
// tend to run out of ephemeral ports? Regardless, binding the v6 loopback
// seems pretty reliable. Only try to bind the v6-only any on UDP and
// gVisor.
int ret = -1;
if (!IsRunningOnGvisor() && param.type == SOCK_STREAM) {
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6.family(), param.type, 0));
ret = bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len);
} else {
// Verify that we can still bind the v6 any on the same port with a
// v6-only socket.
const FileDescriptor fd_v6_only_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
int one = 1;
EXPECT_THAT(setsockopt(fd_v6_only_any.get(), IPPROTO_IPV6, IPV6_V6ONLY,
&one, sizeof(one)),
SyscallSucceeds());
ret =
bind(fd_v6_only_any.get(), reinterpret_cast<sockaddr*>(&addr_v6_any),
test_addr_v6_any.addr_len);
}
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4EphemeralPortReserved) {
auto const& param = GetParam();
// FIXME(b/114268588)
SKIP_IF(IsRunningOnGvisor() && param.type == SOCK_STREAM);
for (int i = 0; true; i++) {
// Bind the v4 loopback on a v4 socket.
TestAddress const& test_addr = V4Loopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(bind(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
&bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
connect(connected_fd.get(), reinterpret_cast<sockaddr*>(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(),
reinterpret_cast<sockaddr*>(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(
bind(checking_fd.get(), reinterpret_cast<sockaddr*>(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v6 socket
// fails.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped,
ephemeral_port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
EXPECT_THAT(
bind(fd_v4_mapped.get(), reinterpret_cast<sockaddr*>(&addr_v4_mapped),
test_addr_v4_mapped.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 any on the same port with a dual-stack socket
// fails.
TestAddress const& test_addr_v6_any = V6Any();
sockaddr_storage addr_v6_any = test_addr_v6_any.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6_any.family(), &addr_v6_any, ephemeral_port));
const FileDescriptor fd_v6_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6_any.get(), reinterpret_cast<sockaddr*>(&addr_v6_any),
test_addr_v6_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// For some reason, binding the TCP v6-only any is flaky on Linux. Maybe we
// tend to run out of ephemeral ports? Regardless, binding the v6 loopback
// seems pretty reliable. Only try to bind the v6-only any on UDP and
// gVisor.
int ret = -1;
if (!IsRunningOnGvisor() && param.type == SOCK_STREAM) {
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6.family(), param.type, 0));
ret = bind(fd_v6.get(), reinterpret_cast<sockaddr*>(&addr_v6),
test_addr_v6.addr_len);
} else {
// Verify that we can still bind the v6 any on the same port with a
// v6-only socket.
const FileDescriptor fd_v6_only_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
int one = 1;
EXPECT_THAT(setsockopt(fd_v6_only_any.get(), IPPROTO_IPV6, IPV6_V6ONLY,
&one, sizeof(one)),
SyscallSucceeds());
ret =
bind(fd_v6_only_any.get(), reinterpret_cast<sockaddr*>(&addr_v6_any),
test_addr_v6_any.addr_len);
}
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, PortReuseTwoSockets) {
auto const& param = GetParam();
TestAddress const& test_addr = V4Loopback();
sockaddr_storage addr = test_addr.addr;
for (int i = 0; i < 2; i++) {
const int portreuse1 = i % 2;
auto s1 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
int fd1 = s1.get();
socklen_t addrlen = test_addr.addr_len;
EXPECT_THAT(
setsockopt(fd1, SOL_SOCKET, SO_REUSEPORT, &portreuse1, sizeof(int)),
SyscallSucceeds());
ASSERT_THAT(bind(fd1, reinterpret_cast<sockaddr*>(&addr), addrlen),
SyscallSucceeds());
ASSERT_THAT(getsockname(fd1, reinterpret_cast<sockaddr*>(&addr), &addrlen),
SyscallSucceeds());
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(fd1, 1), SyscallSucceeds());
}
// j is less than 4 to check that the port reuse logic works correctly after
// closing bound sockets.
for (int j = 0; j < 4; j++) {
const int portreuse2 = j % 2;
auto s2 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
int fd2 = s2.get();
EXPECT_THAT(
setsockopt(fd2, SOL_SOCKET, SO_REUSEPORT, &portreuse2, sizeof(int)),
SyscallSucceeds());
std::cout << portreuse1 << " " << portreuse2;
int ret = bind(fd2, reinterpret_cast<sockaddr*>(&addr), addrlen);
// Verify that two sockets can be bound to the same port only if
// SO_REUSEPORT is set for both of them.
if (!portreuse1 || !portreuse2) {
ASSERT_THAT(ret, SyscallFailsWithErrno(EADDRINUSE));
} else {
ASSERT_THAT(ret, SyscallSucceeds());
}
}
}
}
INSTANTIATE_TEST_SUITE_P(
AllFamlies, SocketMultiProtocolInetLoopbackTest,
::testing::Values(ProtocolTestParam{"TCP", SOCK_STREAM},
ProtocolTestParam{"UDP", SOCK_DGRAM}),
DescribeProtocolTestParam);
} // namespace
} // namespace testing
} // namespace gvisor
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