Implement IP_TTL.

Also change the default TTL to 64 to match Linux.

PiperOrigin-RevId: 273430341

1 files changed, 151 insertions, 0 deletions

diff --git a/test/syscalls/linux/socket_ip_unbound.cc b/test/syscalls/linux/socket_ip_unbound.cc
new file mode 100644
index 000000000..ffd9cde77
--- /dev/null
+++ b/test/syscalls/linux/socket_ip_unbound.cc
@@ -0,0 +1,151 @@
+// Copyright 2019 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 <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+
+#include <cstdio>
+#include <cstring>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "gtest/gtest.h"
+#include "test/syscalls/linux/ip_socket_test_util.h"
+#include "test/syscalls/linux/socket_test_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+// Test fixture for tests that apply to pairs of IP sockets.
+using IPUnboundSocketTest = SimpleSocketTest;
+
+TEST_P(IPUnboundSocketTest, TtlDefault) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int get = -1;
+  socklen_t get_sz = sizeof(get);
+  EXPECT_THAT(getsockopt(socket->get(), IPPROTO_IP, IP_TTL, &get, &get_sz),
+              SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get, 64);
+  EXPECT_EQ(get_sz, sizeof(get));
+}
+
+TEST_P(IPUnboundSocketTest, SetTtl) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int get1 = -1;
+  socklen_t get1_sz = sizeof(get1);
+  EXPECT_THAT(getsockopt(socket->get(), IPPROTO_IP, IP_TTL, &get1, &get1_sz),
+              SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get1_sz, sizeof(get1));
+
+  int set = 100;
+  if (set == get1) {
+    set += 1;
+  }
+  socklen_t set_sz = sizeof(set);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set, set_sz),
+              SyscallSucceedsWithValue(0));
+
+  int get2 = -1;
+  socklen_t get2_sz = sizeof(get2);
+  EXPECT_THAT(getsockopt(socket->get(), IPPROTO_IP, IP_TTL, &get2, &get2_sz),
+              SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get2_sz, sizeof(get2));
+  EXPECT_EQ(get2, set);
+}
+
+TEST_P(IPUnboundSocketTest, ResetTtlToDefault) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int get1 = -1;
+  socklen_t get1_sz = sizeof(get1);
+  EXPECT_THAT(getsockopt(socket->get(), IPPROTO_IP, IP_TTL, &get1, &get1_sz),
+              SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get1_sz, sizeof(get1));
+
+  int set1 = 100;
+  if (set1 == get1) {
+    set1 += 1;
+  }
+  socklen_t set1_sz = sizeof(set1);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set1, set1_sz),
+              SyscallSucceedsWithValue(0));
+
+  int set2 = -1;
+  socklen_t set2_sz = sizeof(set2);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set2, set2_sz),
+              SyscallSucceedsWithValue(0));
+
+  int get2 = -1;
+  socklen_t get2_sz = sizeof(get2);
+  EXPECT_THAT(getsockopt(socket->get(), IPPROTO_IP, IP_TTL, &get2, &get2_sz),
+              SyscallSucceedsWithValue(0));
+  EXPECT_EQ(get2_sz, sizeof(get2));
+  EXPECT_EQ(get2, get1);
+}
+
+TEST_P(IPUnboundSocketTest, ZeroTtl) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int set = 0;
+  socklen_t set_sz = sizeof(set);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set, set_sz),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+TEST_P(IPUnboundSocketTest, InvalidLargeTtl) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int set = 256;
+  socklen_t set_sz = sizeof(set);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set, set_sz),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+TEST_P(IPUnboundSocketTest, InvalidNegativeTtl) {
+  auto socket = ASSERT_NO_ERRNO_AND_VALUE(NewSocket());
+
+  int set = -2;
+  socklen_t set_sz = sizeof(set);
+  EXPECT_THAT(setsockopt(socket->get(), IPPROTO_IP, IP_TTL, &set, set_sz),
+              SyscallFailsWithErrno(EINVAL));
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    IPUnboundSockets, IPUnboundSocketTest,
+    ::testing::ValuesIn(VecCat<SocketKind>(VecCat<SocketKind>(
+        ApplyVec<SocketKind>(IPv4UDPUnboundSocket,
+                             AllBitwiseCombinations(List<int>{SOCK_DGRAM},
+                                                    List<int>{0,
+                                                              SOCK_NONBLOCK})),
+        ApplyVec<SocketKind>(IPv6UDPUnboundSocket,
+                             AllBitwiseCombinations(List<int>{SOCK_DGRAM},
+                                                    List<int>{0,
+                                                              SOCK_NONBLOCK})),
+        ApplyVec<SocketKind>(IPv4TCPUnboundSocket,
+                             AllBitwiseCombinations(List<int>{SOCK_STREAM},
+                                                    List<int>{0,
+                                                              SOCK_NONBLOCK})),
+        ApplyVec<SocketKind>(IPv6TCPUnboundSocket,
+                             AllBitwiseCombinations(List<int>{SOCK_STREAM},
+                                                    List<int>{
+                                                        0, SOCK_NONBLOCK}))))));
+
+}  // namespace testing
+}  // namespace gvisor