1 files changed, 153 insertions, 0 deletions
diff --git a/test/syscalls/linux/socket_netlink.cc b/test/syscalls/linux/socket_netlink.cc
new file mode 100644
index 000000000..4ec0fd4fa
--- /dev/null
+++ b/test/syscalls/linux/socket_netlink.cc
@@ -0,0 +1,153 @@
+// Copyright 2018 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 <linux/netlink.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/test_util.h"
+
+// Tests for all netlink socket protocols.
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+// NetlinkTest parameter is the protocol to test.
+using NetlinkTest = ::testing::TestWithParam<int>;
+
+// Netlink sockets must be SOCK_DGRAM or SOCK_RAW.
+TEST_P(NetlinkTest, Types) {
+  const int protocol = GetParam();
+
+  EXPECT_THAT(socket(AF_NETLINK, SOCK_STREAM, protocol),
+              SyscallFailsWithErrno(ESOCKTNOSUPPORT));
+  EXPECT_THAT(socket(AF_NETLINK, SOCK_SEQPACKET, protocol),
+              SyscallFailsWithErrno(ESOCKTNOSUPPORT));
+  EXPECT_THAT(socket(AF_NETLINK, SOCK_RDM, protocol),
+              SyscallFailsWithErrno(ESOCKTNOSUPPORT));
+  EXPECT_THAT(socket(AF_NETLINK, SOCK_DCCP, protocol),
+              SyscallFailsWithErrno(ESOCKTNOSUPPORT));
+  EXPECT_THAT(socket(AF_NETLINK, SOCK_PACKET, protocol),
+              SyscallFailsWithErrno(ESOCKTNOSUPPORT));
+
+  int fd;
+  EXPECT_THAT(fd = socket(AF_NETLINK, SOCK_DGRAM, protocol), SyscallSucceeds());
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+
+  EXPECT_THAT(fd = socket(AF_NETLINK, SOCK_RAW, protocol), SyscallSucceeds());
+  EXPECT_THAT(close(fd), SyscallSucceeds());
+}
+
+TEST_P(NetlinkTest, AutomaticPort) {
+  const int protocol = GetParam();
+
+  FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
+
+  struct sockaddr_nl addr = {};
+  addr.nl_family = AF_NETLINK;
+
+  EXPECT_THAT(
+      bind(fd.get(), reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)),
+      SyscallSucceeds());
+
+  socklen_t addrlen = sizeof(addr);
+  EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                          &addrlen),
+              SyscallSucceeds());
+  EXPECT_EQ(addrlen, sizeof(addr));
+  // This is the only netlink socket in the process, so it should get the PID as
+  // the port id.
+  //
+  // N.B. Another process could theoretically have explicitly reserved our pid
+  // as a port ID, but that is very unlikely.
+  EXPECT_EQ(addr.nl_pid, getpid());
+}
+
+// Calling connect automatically binds to an automatic port.
+TEST_P(NetlinkTest, ConnectBinds) {
+  const int protocol = GetParam();
+
+  FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
+
+  struct sockaddr_nl addr = {};
+  addr.nl_family = AF_NETLINK;
+
+  EXPECT_THAT(connect(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                      sizeof(addr)),
+              SyscallSucceeds());
+
+  socklen_t addrlen = sizeof(addr);
+  EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                          &addrlen),
+              SyscallSucceeds());
+  EXPECT_EQ(addrlen, sizeof(addr));
+
+  // Each test is running in a pid namespace, so another process can explicitly
+  // reserve our pid as a port ID. In this case, a negative portid value will be
+  // set.
+  if (static_cast<pid_t>(addr.nl_pid) > 0) {
+    EXPECT_EQ(addr.nl_pid, getpid());
+  }
+
+  memset(&addr, 0, sizeof(addr));
+  addr.nl_family = AF_NETLINK;
+
+  // Connecting again is allowed, but keeps the same port.
+  EXPECT_THAT(connect(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                      sizeof(addr)),
+              SyscallSucceeds());
+
+  addrlen = sizeof(addr);
+  EXPECT_THAT(getsockname(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                          &addrlen),
+              SyscallSucceeds());
+  EXPECT_EQ(addrlen, sizeof(addr));
+  EXPECT_EQ(addr.nl_pid, getpid());
+}
+
+TEST_P(NetlinkTest, GetPeerName) {
+  const int protocol = GetParam();
+
+  FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_NETLINK, SOCK_RAW, protocol));
+
+  struct sockaddr_nl addr = {};
+  socklen_t addrlen = sizeof(addr);
+
+  EXPECT_THAT(getpeername(fd.get(), reinterpret_cast<struct sockaddr*>(&addr),
+                          &addrlen),
+              SyscallSucceeds());
+
+  EXPECT_EQ(addrlen, sizeof(addr));
+  EXPECT_EQ(addr.nl_family, AF_NETLINK);
+  // Peer is the kernel if we didn't connect elsewhere.
+  EXPECT_EQ(addr.nl_pid, 0);
+}
+
+INSTANTIATE_TEST_SUITE_P(ProtocolTest, NetlinkTest,
+                         ::testing::Values(NETLINK_ROUTE,
+                                           NETLINK_KOBJECT_UEVENT));
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor