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fix: bypass NIC auto-filter when interface is explicitly whitelisted via NICS (#1805)

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Co-authored-by: henrygd <hank@henrygd.me>
This commit is contained in:
Sven van Ginkel
2026-03-09 22:47:59 +01:00
committed by GitHub
parent cae6ac4626
commit d38c0da06d
2 changed files with 47 additions and 5 deletions
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19
agent/network.go
View File

@@ -104,10 +104,7 @@ func (a *Agent) initializeNetIoStats() {
// get current network I/O stats and record valid interfaces
if netIO, err := psutilNet.IOCounters(true); err == nil {
for _, v := range netIO {
if nicsEnvExists && !isValidNic(v.Name, nicCfg) {
continue
}
if a.skipNetworkInterface(v) {
if skipNetworkInterface(v, nicCfg) {
continue
}
slog.Info("Detected network interface", "name", v.Name, "sent", v.BytesSent, "recv", v.BytesRecv)
@@ -243,7 +240,19 @@ func (a *Agent) applyNetworkTotals(
a.netIoStats[cacheTimeMs] = nis
}
func (a *Agent) skipNetworkInterface(v psutilNet.IOCountersStat) bool {
// skipNetworkInterface returns true if the network interface should be ignored.
func skipNetworkInterface(v psutilNet.IOCountersStat, nicCfg *NicConfig) bool {
if nicCfg != nil {
if !isValidNic(v.Name, nicCfg) {
return true
}
// In whitelist mode, we honor explicit inclusion without auto-filtering.
if !nicCfg.isBlacklist {
return false
}
// In blacklist mode, still apply the auto-filter below.
}
switch {
case strings.HasPrefix(v.Name, "lo"),
strings.HasPrefix(v.Name, "docker"),

33
agent/network_test.go
View File

@@ -261,6 +261,39 @@ func TestNewNicConfig(t *testing.T) {
})
}
}
func TestSkipNetworkInterface(t *testing.T) {
tests := []struct {
name string
nic psutilNet.IOCountersStat
nicCfg *NicConfig
expectSkip bool
}{
{"loopback lo", psutilNet.IOCountersStat{Name: "lo", BytesSent: 100, BytesRecv: 100}, nil, true},
{"loopback lo0", psutilNet.IOCountersStat{Name: "lo0", BytesSent: 100, BytesRecv: 100}, nil, true},
{"docker prefix", psutilNet.IOCountersStat{Name: "docker0", BytesSent: 100, BytesRecv: 100}, nil, true},
{"br- prefix", psutilNet.IOCountersStat{Name: "br-lan", BytesSent: 100, BytesRecv: 100}, nil, true},
{"veth prefix", psutilNet.IOCountersStat{Name: "veth0abc", BytesSent: 100, BytesRecv: 100}, nil, true},
{"bond prefix", psutilNet.IOCountersStat{Name: "bond0", BytesSent: 100, BytesRecv: 100}, nil, true},
{"cali prefix", psutilNet.IOCountersStat{Name: "cali1234", BytesSent: 100, BytesRecv: 100}, nil, true},
{"zero BytesRecv", psutilNet.IOCountersStat{Name: "eth0", BytesSent: 100, BytesRecv: 0}, nil, true},
{"zero BytesSent", psutilNet.IOCountersStat{Name: "eth0", BytesSent: 0, BytesRecv: 100}, nil, true},
{"both zero", psutilNet.IOCountersStat{Name: "eth0", BytesSent: 0, BytesRecv: 0}, nil, true},
{"normal eth0", psutilNet.IOCountersStat{Name: "eth0", BytesSent: 100, BytesRecv: 200}, nil, false},
{"normal wlan0", psutilNet.IOCountersStat{Name: "wlan0", BytesSent: 1, BytesRecv: 1}, nil, false},
{"whitelist overrides skip (docker)", psutilNet.IOCountersStat{Name: "docker0", BytesSent: 100, BytesRecv: 100}, newNicConfig("docker0"), false},
{"whitelist overrides skip (lo)", psutilNet.IOCountersStat{Name: "lo", BytesSent: 100, BytesRecv: 100}, newNicConfig("lo"), false},
{"whitelist exclusion", psutilNet.IOCountersStat{Name: "eth1", BytesSent: 100, BytesRecv: 100}, newNicConfig("eth0"), true},
{"blacklist skip lo", psutilNet.IOCountersStat{Name: "lo", BytesSent: 100, BytesRecv: 100}, newNicConfig("-eth0"), true},
{"blacklist explicit eth0", psutilNet.IOCountersStat{Name: "eth0", BytesSent: 100, BytesRecv: 100}, newNicConfig("-eth0"), true},
{"blacklist allow eth1", psutilNet.IOCountersStat{Name: "eth1", BytesSent: 100, BytesRecv: 100}, newNicConfig("-eth0"), false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
assert.Equal(t, tt.expectSkip, skipNetworkInterface(tt.nic, tt.nicCfg))
})
}
}
func TestEnsureNetworkInterfacesMap(t *testing.T) {
var a Agent
var stats system.Stats