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test/syscalls/proc_net: /proc/net/snmp can contain system-wide statistics

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This is a new kernel feature that are controlled by the net.core.mibs_allocation
sysctl.

PiperOrigin-RevId: 391215784
This commit is contained in:
Andrei Vagin
2021-08-16 23:14:40 -07:00
committed by gVisor bot
parent bb13d015a4
commit 6294a7a6ec
1 changed files with 44 additions and 7 deletions
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test/syscalls/linux/proc_net.cc
+44 -7
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@@ -152,6 +152,22 @@ TEST(ProcNetDev, Format) {
EXPECT_GT(entries.size(), 0);
}
// GetMibsAllocationSysctl retuns a value of the net.core.mibs_allocation
// sysctl./proc/sys/net/core/mibs_allocation
//
// When mibs_allocation is unset, a netns creation inherits MIB from init
// network namespace. Otherwise, MIBS is allocated for each namespace.
int GetMibsAllocationSysctl() {
auto ret = GetContents("/proc/sys/net/core/mibs_allocation");
if (!ret.ok()) {
// The current kernel doesn't support mibs_allocation.
return 1;
}
int32_t val;
EXPECT_TRUE(absl::SimpleAtoi(ret.ValueOrDie(), &val));
return val;
}
PosixErrorOr<uint64_t> GetSNMPMetricFromProc(const std::string snmp,
const std::string& type,
const std::string& item) {
@@ -226,12 +242,21 @@ TEST(ProcNetSnmp, TcpReset) {
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);
if (GetMibsAllocationSysctl()) {
EXPECT_EQ(oldActiveOpens, newActiveOpens - 1);
EXPECT_EQ(oldOutRsts, newOutRsts - 1);
EXPECT_EQ(oldAttemptFails, newAttemptFails - 1);
} else {
// System-wide statistics can have some noise.
EXPECT_LE(oldOutRsts, newOutRsts - 1);
EXPECT_LE(oldAttemptFails, newAttemptFails - 1);
}
}
TEST(ProcNetSnmp, TcpEstab) {
// System-wide statistics can have some noise.
SKIP_IF(GetMibsAllocationSysctl() == 0);
// TODO(gvisor.dev/issue/866): epsocket metrics are not savable.
DisableSave ds;
@@ -355,8 +380,14 @@ TEST(ProcNetSnmp, UdpNoPorts) {
newNoPorts =
ASSERT_NO_ERRNO_AND_VALUE(GetSNMPMetricFromProc(snmp, "Udp", "NoPorts"));
EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_EQ(oldNoPorts, newNoPorts - 1);
if (GetMibsAllocationSysctl()) {
EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_EQ(oldNoPorts, newNoPorts - 1);
} else {
// System-wide statistics can have some noise.
EXPECT_LE(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_LE(oldNoPorts, newNoPorts - 1);
}
}
TEST(ProcNetSnmp, UdpIn) {
@@ -405,8 +436,14 @@ TEST(ProcNetSnmp, UdpIn) {
newInDatagrams = ASSERT_NO_ERRNO_AND_VALUE(
GetSNMPMetricFromProc(snmp, "Udp", "InDatagrams"));
EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_EQ(oldInDatagrams, newInDatagrams - 1);
if (GetMibsAllocationSysctl()) {
EXPECT_EQ(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_EQ(oldInDatagrams, newInDatagrams - 1);
} else {
// System-wide statistics can have some noise.
EXPECT_LE(oldOutDatagrams, newOutDatagrams - 1);
EXPECT_LE(oldInDatagrams, newInDatagrams - 1);
}
}
TEST(ProcNetSnmp, CheckNetStat) {