1 files changed, 270 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc_net.cc b/test/syscalls/linux/proc_net.cc
index efdaf202b..dcfd5f86c 100644
--- a/test/syscalls/linux/proc_net.cc
+++ b/test/syscalls/linux/proc_net.cc
@@ -12,8 +12,19 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <arpa/inet.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <sys/socket.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+
 #include "gtest/gtest.h"
 #include "gtest/gtest.h"
+#include "absl/strings/str_split.h"
+#include "absl/time/clock.h"
+#include "test/syscalls/linux/socket_test_util.h"
 #include "test/util/capability_util.h"
 #include "test/util/file_descriptor.h"
 #include "test/util/fs_util.h"
@@ -57,6 +68,265 @@ TEST(ProcSysNetIpv4Sack, CanReadAndWrite) {
   EXPECT_EQ(buf, to_write);
 }
 
+PosixErrorOr<uint64_t> GetSNMPMetricFromProc(const std::string snmp,
+                                             const std::string &type,
+                                             const std::string &item) {
+  std::vector<std::string> snmp_vec = absl::StrSplit(snmp, '\n');
+
+  // /proc/net/snmp prints a line of headers followed by a line of metrics.
+  // Only search the headers.
+  for (unsigned i = 0; i < snmp_vec.size(); i = i + 2) {
+    if (!absl::StartsWith(snmp_vec[i], type)) continue;
+
+    std::vector<std::string> fields =
+        absl::StrSplit(snmp_vec[i], ' ', absl::SkipWhitespace());
+
+    EXPECT_TRUE((i + 1) < snmp_vec.size());
+    std::vector<std::string> values =
+        absl::StrSplit(snmp_vec[i + 1], ' ', absl::SkipWhitespace());
+
+    EXPECT_TRUE(!fields.empty() && fields.size() == values.size());
+
+    // Metrics start at the first index.
+    for (unsigned j = 1; j < fields.size(); j++) {
+      if (fields[j] == item) {
+        uint64_t val;
+        if (!absl::SimpleAtoi(values[j], &val)) {
+          return PosixError(EINVAL,
+                            absl::StrCat("field is not a number: ", values[j]));
+        }
+
+        return val;
+      }
+    }
+  }
+  // We should never get here.
+  return PosixError(
+      EINVAL, absl::StrCat("failed to find ", type, "/", item, " in:", snmp));
+}
+
+TEST(ProcNetSnmp, TcpReset_NoRandomSave) {
+  // TODO(gvisor.dev/issue/866): epsocket metrics are not savable.
+  DisableSave ds;
+
+  uint64_t oldAttemptFails;
+  uint64_t oldActiveOpens;
+  uint64_t oldOutRsts;
+  auto snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  oldActiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "ActiveOpens"));
+  oldOutRsts =
+      ASSERT_NO_ERRNO_AND_VALUE(GetSNMPMetricFromProc(snmp, "Tcp", "OutRsts"));
+  oldAttemptFails = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "AttemptFails"));
+
+  FileDescriptor s = ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_STREAM, 0));
+
+  struct sockaddr_in sin = {
+      .sin_family = AF_INET,
+      .sin_port = htons(1234),
+  };
+
+  ASSERT_EQ(inet_pton(AF_INET, "127.0.0.1", &(sin.sin_addr)), 1);
+  ASSERT_THAT(connect(s.get(), (struct sockaddr *)&sin, sizeof(sin)),
+              SyscallFailsWithErrno(ECONNREFUSED));
+
+  uint64_t newAttemptFails;
+  uint64_t newActiveOpens;
+  uint64_t newOutRsts;
+  snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  newActiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "ActiveOpens"));
+  newOutRsts =
+      ASSERT_NO_ERRNO_AND_VALUE(GetSNMPMetricFromProc(snmp, "Tcp", "OutRsts"));
+  newAttemptFails = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "AttemptFails"));
+
+  EXPECT_EQ(oldActiveOpens, newActiveOpens - 1);
+  EXPECT_EQ(oldOutRsts, newOutRsts - 1);
+  EXPECT_EQ(oldAttemptFails, newAttemptFails - 1);
+}
+
+TEST(ProcNetSnmp, TcpEstab_NoRandomSave) {
+  // TODO(gvisor.dev/issue/866): epsocket metrics are not savable.
+  DisableSave ds;
+
+  uint64_t oldEstabResets;
+  uint64_t oldActiveOpens;
+  uint64_t oldPassiveOpens;
+  uint64_t oldCurrEstab;
+  auto snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  oldActiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "ActiveOpens"));
+  oldPassiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "PassiveOpens"));
+  oldCurrEstab = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "CurrEstab"));
+  oldEstabResets = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "EstabResets"));
+
+  FileDescriptor s_listen =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_STREAM, 0));
+  struct sockaddr_in sin = {
+      .sin_family = AF_INET,
+      .sin_port = 0,
+  };
+
+  ASSERT_EQ(inet_pton(AF_INET, "127.0.0.1", &(sin.sin_addr)), 1);
+  ASSERT_THAT(bind(s_listen.get(), (struct sockaddr *)&sin, sizeof(sin)),
+              SyscallSucceeds());
+  ASSERT_THAT(listen(s_listen.get(), 1), SyscallSucceeds());
+
+  // Get the port bound by the listening socket.
+  socklen_t addrlen = sizeof(sin);
+  ASSERT_THAT(
+      getsockname(s_listen.get(), reinterpret_cast<sockaddr *>(&sin), &addrlen),
+      SyscallSucceeds());
+
+  FileDescriptor s_connect =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_STREAM, 0));
+  ASSERT_THAT(connect(s_connect.get(), (struct sockaddr *)&sin, sizeof(sin)),
+              SyscallSucceeds());
+
+  auto s_accept =
+      ASSERT_NO_ERRNO_AND_VALUE(Accept(s_listen.get(), nullptr, nullptr));
+
+  uint64_t newEstabResets;
+  uint64_t newActiveOpens;
+  uint64_t newPassiveOpens;
+  uint64_t newCurrEstab;
+  snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  newActiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "ActiveOpens"));
+  newPassiveOpens = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "PassiveOpens"));
+  newCurrEstab = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "CurrEstab"));
+
+  EXPECT_EQ(oldActiveOpens, newActiveOpens - 1);
+  EXPECT_EQ(oldPassiveOpens, newPassiveOpens - 1);
+  EXPECT_EQ(oldCurrEstab, newCurrEstab - 2);
+
+  // Send 1 byte from client to server.
+  ASSERT_THAT(send(s_connect.get(), "a", 1, 0), SyscallSucceedsWithValue(1));
+
+  constexpr int kPollTimeoutMs = 20000;  // Wait up to 20 seconds for the data.
+
+  // Wait until server-side fd sees the data on its side but don't read it.
+  struct pollfd poll_fd = {s_accept.get(), POLLIN, 0};
+  ASSERT_THAT(RetryEINTR(poll)(&poll_fd, 1, kPollTimeoutMs),
+              SyscallSucceedsWithValue(1));
+
+  // Now close server-side fd without reading the data which leads to a RST
+  // packet sent to client side.
+  s_accept.reset(-1);
+
+  // Wait until client-side fd sees RST packet.
+  struct pollfd poll_fd1 = {s_connect.get(), POLLIN, 0};
+  ASSERT_THAT(RetryEINTR(poll)(&poll_fd1, 1, kPollTimeoutMs),
+              SyscallSucceedsWithValue(1));
+
+  // Now close client-side fd.
+  s_connect.reset(-1);
+
+  // Wait until the process of the netstack.
+  absl::SleepFor(absl::Seconds(1));
+
+  snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  newCurrEstab = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "CurrEstab"));
+  newEstabResets = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Tcp", "EstabResets"));
+
+  EXPECT_EQ(oldCurrEstab, newCurrEstab);
+  EXPECT_EQ(oldEstabResets, newEstabResets - 2);
+}
+
+TEST(ProcNetSnmp, UdpNoPorts_NoRandomSave) {
+  // TODO(gvisor.dev/issue/866): epsocket metrics are not savable.
+  DisableSave ds;
+
+  uint64_t oldOutDatagrams;
+  uint64_t oldNoPorts;
+  auto snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  oldOutDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "OutDatagrams"));
+  oldNoPorts =
+      ASSERT_NO_ERRNO_AND_VALUE(GetSNMPMetricFromProc(snmp, "Udp", "NoPorts"));
+
+  FileDescriptor s = ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+
+  struct sockaddr_in sin = {
+      .sin_family = AF_INET,
+      .sin_port = htons(4444),
+  };
+  ASSERT_EQ(inet_pton(AF_INET, "127.0.0.1", &(sin.sin_addr)), 1);
+  ASSERT_THAT(sendto(s.get(), "a", 1, 0, (struct sockaddr *)&sin, sizeof(sin)),
+              SyscallSucceedsWithValue(1));
+
+  uint64_t newOutDatagrams;
+  uint64_t newNoPorts;
+  snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  newOutDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "OutDatagrams"));
+  newNoPorts =
+      ASSERT_NO_ERRNO_AND_VALUE(GetSNMPMetricFromProc(snmp, "Udp", "NoPorts"));
+
+  EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
+  EXPECT_EQ(oldNoPorts, newNoPorts - 1);
+}
+
+TEST(ProcNetSnmp, UdpIn) {
+  // TODO(gvisor.dev/issue/866): epsocket metrics are not savable.
+  const DisableSave ds;
+
+  uint64_t oldOutDatagrams;
+  uint64_t oldInDatagrams;
+  auto snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  oldOutDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "OutDatagrams"));
+  oldInDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "InDatagrams"));
+
+  std::cerr << "snmp: " << std::endl << snmp << std::endl;
+  FileDescriptor server =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+  struct sockaddr_in sin = {
+      .sin_family = AF_INET,
+      .sin_port = htons(0),
+  };
+  ASSERT_EQ(inet_pton(AF_INET, "127.0.0.1", &(sin.sin_addr)), 1);
+  ASSERT_THAT(bind(server.get(), (struct sockaddr *)&sin, sizeof(sin)),
+              SyscallSucceeds());
+  // Get the port bound by the server socket.
+  socklen_t addrlen = sizeof(sin);
+  ASSERT_THAT(
+      getsockname(server.get(), reinterpret_cast<sockaddr *>(&sin), &addrlen),
+      SyscallSucceeds());
+
+  FileDescriptor client =
+      ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET, SOCK_DGRAM, 0));
+  ASSERT_THAT(
+      sendto(client.get(), "a", 1, 0, (struct sockaddr *)&sin, sizeof(sin)),
+      SyscallSucceedsWithValue(1));
+
+  char buf[128];
+  ASSERT_THAT(recvfrom(server.get(), buf, sizeof(buf), 0, NULL, NULL),
+              SyscallSucceedsWithValue(1));
+
+  uint64_t newOutDatagrams;
+  uint64_t newInDatagrams;
+  snmp = ASSERT_NO_ERRNO_AND_VALUE(GetContents("/proc/net/snmp"));
+  std::cerr << "new snmp: " << std::endl << snmp << std::endl;
+  newOutDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "OutDatagrams"));
+  newInDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
+      GetSNMPMetricFromProc(snmp, "Udp", "InDatagrams"));
+
+  EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
+  EXPECT_EQ(oldInDatagrams, newInDatagrams - 1);
+}
+
 }  // namespace
 }  // namespace testing
 }  // namespace gvisor