154 lines
4.9 KiB
C++
154 lines
4.9 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <linux/netlink.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "test/syscalls/linux/socket_test_util.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/test_util.h"
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// Tests for all netlink socket protocols.
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namespace gvisor {
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namespace testing {
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namespace {
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// NetlinkTest parameter is the protocol to test.
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using NetlinkTest = ::testing::TestWithParam<int>;
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// Netlink sockets must be SOCK_DGRAM or SOCK_RAW.
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TEST_P(NetlinkTest, Types) {
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const int protocol = GetParam();
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EXPECT_THAT(socket(AF_NETLINK, SOCK_STREAM, protocol),
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SyscallFailsWithErrno(ESOCKTNOSUPPORT));
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EXPECT_THAT(socket(AF_NETLINK, SOCK_SEQPACKET, protocol),
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SyscallFailsWithErrno(ESOCKTNOSUPPORT));
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EXPECT_THAT(socket(AF_NETLINK, SOCK_RDM, protocol),
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SyscallFailsWithErrno(ESOCKTNOSUPPORT));
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EXPECT_THAT(socket(AF_NETLINK, SOCK_DCCP, protocol),
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SyscallFailsWithErrno(ESOCKTNOSUPPORT));
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EXPECT_THAT(socket(AF_NETLINK, SOCK_PACKET, protocol),
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SyscallFailsWithErrno(ESOCKTNOSUPPORT));
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int fd;
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EXPECT_THAT(fd = socket(AF_NETLINK, SOCK_DGRAM, protocol), SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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EXPECT_THAT(fd = socket(AF_NETLINK, SOCK_RAW, protocol), SyscallSucceeds());
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EXPECT_THAT(close(fd), SyscallSucceeds());
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}
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TEST_P(NetlinkTest, AutomaticPort) {
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const int protocol = GetParam();
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
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struct sockaddr_nl addr = {};
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addr.nl_family = AF_NETLINK;
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EXPECT_THAT(
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bind(fd.get(), reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)),
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SyscallSucceeds());
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socklen_t addrlen = sizeof(addr);
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EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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&addrlen),
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SyscallSucceeds());
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EXPECT_EQ(addrlen, sizeof(addr));
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// This is the only netlink socket in the process, so it should get the PID as
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// the port id.
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//
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// N.B. Another process could theoretically have explicitly reserved our pid
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// as a port ID, but that is very unlikely.
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EXPECT_EQ(addr.nl_pid, getpid());
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}
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// Calling connect automatically binds to an automatic port.
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TEST_P(NetlinkTest, ConnectBinds) {
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const int protocol = GetParam();
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
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struct sockaddr_nl addr = {};
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addr.nl_family = AF_NETLINK;
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EXPECT_THAT(connect(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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sizeof(addr)),
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SyscallSucceeds());
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socklen_t addrlen = sizeof(addr);
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EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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&addrlen),
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SyscallSucceeds());
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EXPECT_EQ(addrlen, sizeof(addr));
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// Each test is running in a pid namespace, so another process can explicitly
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// reserve our pid as a port ID. In this case, a negative portid value will be
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// set.
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if (static_cast<pid_t>(addr.nl_pid) > 0) {
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EXPECT_EQ(addr.nl_pid, getpid());
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}
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memset(&addr, 0, sizeof(addr));
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addr.nl_family = AF_NETLINK;
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// Connecting again is allowed, but keeps the same port.
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EXPECT_THAT(connect(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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sizeof(addr)),
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SyscallSucceeds());
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addrlen = sizeof(addr);
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EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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&addrlen),
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SyscallSucceeds());
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EXPECT_EQ(addrlen, sizeof(addr));
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EXPECT_EQ(addr.nl_pid, getpid());
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}
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TEST_P(NetlinkTest, GetPeerName) {
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const int protocol = GetParam();
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
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struct sockaddr_nl addr = {};
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socklen_t addrlen = sizeof(addr);
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EXPECT_THAT(getpeername(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
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&addrlen),
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SyscallSucceeds());
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EXPECT_EQ(addrlen, sizeof(addr));
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EXPECT_EQ(addr.nl_family, AF_NETLINK);
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// Peer is the kernel if we didn't connect elsewhere.
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EXPECT_EQ(addr.nl_pid, 0);
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}
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INSTANTIATE_TEST_SUITE_P(ProtocolTest, NetlinkTest,
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::testing::Values(NETLINK_ROUTE,
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NETLINK_KOBJECT_UEVENT));
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} // namespace
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} // namespace testing
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} // namespace gvisor
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