Refactor syscall tests

- Move shared helpers V4Multicast and V4Broadcast to socket_test_util
- Add unnamed namespace so socket_ipv4_tcp_unbound_external_networking_test.cc
  and socket_ipv4_udp_unbound_external_networking_test.cc can be compiled
  together
- Add test files to "exports_files" so they can be included by Fuchsia's syscall
  test setup

PiperOrigin-RevId: 293880429

test/syscalls/linux/BUILD

@@ -12,6 +12,9 @@ exports_files(
         "socket_ip_loopback_blocking.cc",
         "socket_ip_tcp_loopback.cc",
         "socket_ip_udp_loopback.cc",
+        "socket_ip_unbound.cc",
+        "socket_ipv4_tcp_unbound_external_networking_test.cc",
+        "socket_ipv4_udp_unbound_external_networking_test.cc",
         "socket_ipv4_udp_unbound_loopback.cc",
         "tcp_socket.cc",
         "udp_socket.cc",

test/syscalls/linux/socket_ipv4_tcp_unbound_external_networking_test.cc

@@ -22,6 +22,7 @@
 
 namespace gvisor {
 namespace testing {
+namespace {
 
 std::vector<SocketKind> GetSockets() {
   return ApplyVec<SocketKind>(
@@ -32,5 +33,7 @@ std::vector<SocketKind> GetSockets() {
 INSTANTIATE_TEST_SUITE_P(IPv4TCPUnboundSockets,
                          IPv4TCPUnboundExternalNetworkingSocketTest,
                          ::testing::ValuesIn(GetSockets()));
+
+}  // namespace
 }  // namespace testing
 }  // namespace gvisor

test/syscalls/linux/socket_ipv4_udp_unbound.cc

@@ -30,27 +30,6 @@
 namespace gvisor {
 namespace testing {
 
-constexpr char kMulticastAddress[] = "224.0.2.1";
-constexpr char kBroadcastAddress[] = "255.255.255.255";
-
-TestAddress V4Multicast() {
-  TestAddress t("V4Multicast");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
-      inet_addr(kMulticastAddress);
-  return t;
-}
-
-TestAddress V4Broadcast() {
-  TestAddress t("V4Broadcast");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
-      inet_addr(kBroadcastAddress);
-  return t;
-}
-
 // Check that packets are not received without a group membership. Default send
 // interface configured by bind.
 TEST_P(IPv4UDPUnboundSocketTest, IpMulticastLoopbackNoGroup) {

test/syscalls/linux/socket_ipv4_udp_unbound_external_networking.cc

@@ -41,26 +41,6 @@ TestAddress V4EmptyAddress() {
   return t;
 }
 
-constexpr char kMulticastAddress[] = "224.0.2.1";
-
-TestAddress V4Multicast() {
-  TestAddress t("V4Multicast");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
-      inet_addr(kMulticastAddress);
-  return t;
-}
-
-TestAddress V4Broadcast() {
-  TestAddress t("V4Broadcast");
-  t.addr.ss_family = AF_INET;
-  t.addr_len = sizeof(sockaddr_in);
-  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
-      htonl(INADDR_BROADCAST);
-  return t;
-}
-
 void IPv4UDPUnboundExternalNetworkingSocketTest::SetUp() {
   got_if_infos_ = false;
 

test/syscalls/linux/socket_ipv4_udp_unbound_external_networking_test.cc

@@ -22,6 +22,7 @@
 
 namespace gvisor {
 namespace testing {
+namespace {
 
 std::vector<SocketKind> GetSockets() {
   return ApplyVec<SocketKind>(
@@ -32,5 +33,7 @@ std::vector<SocketKind> GetSockets() {
 INSTANTIATE_TEST_SUITE_P(IPv4UDPUnboundSockets,
                          IPv4UDPUnboundExternalNetworkingSocketTest,
                          ::testing::ValuesIn(GetSockets()));
+
+}  // namespace
 }  // namespace testing
 }  // namespace gvisor

test/syscalls/linux/socket_test_util.cc

@@ -805,6 +805,24 @@ TestAddress V4MappedLoopback() {
   return t;
 }
 
+TestAddress V4Multicast() {
+  TestAddress t("V4Multicast");
+  t.addr.ss_family = AF_INET;
+  t.addr_len = sizeof(sockaddr_in);
+  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
+      inet_addr(kMulticastAddress);
+  return t;
+}
+
+TestAddress V4Broadcast() {
+  TestAddress t("V4Broadcast");
+  t.addr.ss_family = AF_INET;
+  t.addr_len = sizeof(sockaddr_in);
+  reinterpret_cast<sockaddr_in*>(&t.addr)->sin_addr.s_addr =
+      htonl(INADDR_BROADCAST);
+  return t;
+}
+
 TestAddress V6Any() {
   TestAddress t("V6Any");
   t.addr.ss_family = AF_INET6;

test/syscalls/linux/socket_test_util.h

@@ -484,10 +484,15 @@ struct TestAddress {
       : description(std::move(description)), addr(), addr_len() {}
 };
 
+constexpr char kMulticastAddress[] = "224.0.2.1";
+constexpr char kBroadcastAddress[] = "255.255.255.255";
+
 TestAddress V4Any();
+TestAddress V4Broadcast();
 TestAddress V4Loopback();
 TestAddress V4MappedAny();
 TestAddress V4MappedLoopback();
+TestAddress V4Multicast();
 TestAddress V6Any();
 TestAddress V6Loopback();