Allow creating packet socket bound to any protocol

...even protocols the stack is unaware of.

While I am here, annotate checklocks on stack.packetEndpointList.

PiperOrigin-RevId: 397226754

1 files changed, 60 insertions, 0 deletions

diff --git a/test/syscalls/linux/packet_socket.cc b/test/syscalls/linux/packet_socket.cc
new file mode 100644
index 000000000..c8d1e1d4a
--- /dev/null
+++ b/test/syscalls/linux/packet_socket.cc
@@ -0,0 +1,60 @@
+// Copyright 2021 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 <netinet/if_ether.h>
+
+#include <limits>
+
+#include "gtest/gtest.h"
+#include "test/util/capability_util.h"
+#include "test/util/file_descriptor.h"
+#include "test/util/socket_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+using ::testing::Combine;
+using ::testing::Values;
+
+class PacketSocketTest : public ::testing::TestWithParam<std::tuple<int, int>> {
+ protected:
+  void SetUp() override {
+    if (!ASSERT_NO_ERRNO_AND_VALUE(HavePacketSocketCapability())) {
+      const auto [type, protocol] = GetParam();
+      ASSERT_THAT(socket(AF_PACKET, type, htons(protocol)),
+                  SyscallFailsWithErrno(EPERM));
+      GTEST_SKIP() << "Missing packet socket capability";
+    }
+  }
+};
+
+TEST_P(PacketSocketTest, Create) {
+  const auto [type, protocol] = GetParam();
+  FileDescriptor fd =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_PACKET, type, htons(protocol)));
+  EXPECT_GE(fd.get(), 0);
+}
+
+INSTANTIATE_TEST_SUITE_P(AllPacketSocketTests, PacketSocketTest,
+                         Combine(Values(SOCK_DGRAM, SOCK_RAW),
+                                 Values(0, 1, 255, ETH_P_IP, ETH_P_IPV6,
+                                        std::numeric_limits<uint16_t>::max())));
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor