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kube-proxy: do not delete previously stale but currently active chains

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In some cases a chain could change from stale to active, but once it's
added to staleChains it would always be deleted once. When the proxier
tries to delete a previously stale but currently active chain, it would
fail and lead to errors, though it won't cause real problem thanks to
kernel's validation.

The commit removes a chain from staleChains if it becomes active.

Signed-off-by: Quan Tian <qtian@vmware.com>
This commit is contained in:
Quan Tian 2024-01-05 17:54:51 +08:00
parent 18608cc56b
commit ca8c27c480
2 changed files with 92 additions and 5 deletions
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14
pkg/proxy/nftables/proxier.go
View File

@ -1525,11 +1525,15 @@ func (proxier *Proxier) syncProxyRules() {
existingChains, err := proxier.nftables.List(context.TODO(), "chains")
if err == nil {
for _, chain := range existingChains {
if isServiceChainName(chain) && !activeChains.Has(chain) {
tx.Flush(&knftables.Chain{
Name: chain,
})
proxier.staleChains[chain] = start
if isServiceChainName(chain) {
if !activeChains.Has(chain) {
tx.Flush(&knftables.Chain{
Name: chain,
})
proxier.staleChains[chain] = start
} else {
delete(proxier.staleChains, chain)
}
}
}
} else if !knftables.IsNotFound(err) {

83
pkg/proxy/nftables/proxier_test.go
View File

@ -35,6 +35,7 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/sets"
utilfeature "k8s.io/apiserver/pkg/util/feature"
featuregatetesting "k8s.io/component-base/featuregate/testing"
"k8s.io/component-base/metrics/testutil"
@ -4649,6 +4650,88 @@ func TestSyncProxyRulesRepeated(t *testing.T) {
`)
assertNFTablesTransactionEqual(t, getLine(), expected, nft.Dump())
// Empty a service's endpoints; its chains will be flushed, but not immediately deleted.
eps3update3 := eps3update2.DeepCopy()
eps3update3.Endpoints = []discovery.Endpoint{}
fp.OnEndpointSliceUpdate(eps3update2, eps3update3)
fp.syncProxyRules()
expected = baseRules + dedent.Dedent(`
add element ip kube-proxy service-ips { 172.30.0.41 . tcp . 80 : goto service-ULMVA6XW-ns1/svc1/tcp/p80 }
add element ip kube-proxy no-endpoint-services { 172.30.0.43 . tcp . 80 comment "ns3/svc3:p80" : goto reject-chain }
add element ip kube-proxy service-ips { 172.30.0.44 . tcp . 80 : goto service-LAUZTJTB-ns4/svc4/tcp/p80 }
add chain ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80
add rule ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80 ip daddr 172.30.0.41 tcp dport 80 ip saddr != 10.0.0.0/8 jump mark-for-masquerade
add rule ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80 numgen random mod 1 vmap { 0 : goto endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 }
add chain ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80
add rule ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 ip saddr 10.0.1.1 jump mark-for-masquerade
add rule ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 meta l4proto tcp dnat to 10.0.1.1:80
add chain ip kube-proxy service-4AT6LBPK-ns3/svc3/tcp/p80
add chain ip kube-proxy endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80
add chain ip kube-proxy endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80
add chain ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80
add rule ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80 ip daddr 172.30.0.44 tcp dport 80 ip saddr != 10.0.0.0/8 jump mark-for-masquerade
add rule ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80 numgen random mod 1 vmap { 0 : goto endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 }
add chain ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80
add rule ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 ip saddr 10.0.4.1 jump mark-for-masquerade
add rule ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 meta l4proto tcp dnat to 10.0.4.1:80
`)
assertNFTablesTransactionEqual(t, getLine(), expected, nft.Dump())
expectedStaleChains := sets.NewString("service-4AT6LBPK-ns3/svc3/tcp/p80", "endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80", "endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80")
gotStaleChains := sets.StringKeySet(fp.staleChains)
if !expectedStaleChains.Equal(gotStaleChains) {
t.Errorf("expected stale chains %v, got %v", expectedStaleChains, gotStaleChains)
}
// Restore endpoints to non-empty immediately; its chains will be restored, and deleted from staleChains.
fp.OnEndpointSliceUpdate(eps3update3, eps3update2)
fp.syncProxyRules()
expected = baseRules + dedent.Dedent(`
add element ip kube-proxy service-ips { 172.30.0.41 . tcp . 80 : goto service-ULMVA6XW-ns1/svc1/tcp/p80 }
add element ip kube-proxy service-ips { 172.30.0.43 . tcp . 80 : goto service-4AT6LBPK-ns3/svc3/tcp/p80 }
add element ip kube-proxy service-ips { 172.30.0.44 . tcp . 80 : goto service-LAUZTJTB-ns4/svc4/tcp/p80 }
add chain ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80
add rule ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80 ip daddr 172.30.0.41 tcp dport 80 ip saddr != 10.0.0.0/8 jump mark-for-masquerade
add rule ip kube-proxy service-ULMVA6XW-ns1/svc1/tcp/p80 numgen random mod 1 vmap { 0 : goto endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 }
add chain ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80
add rule ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 ip saddr 10.0.1.1 jump mark-for-masquerade
add rule ip kube-proxy endpoint-5TPGNJF2-ns1/svc1/tcp/p80__10.0.1.1/80 meta l4proto tcp dnat to 10.0.1.1:80
add chain ip kube-proxy service-4AT6LBPK-ns3/svc3/tcp/p80
add rule ip kube-proxy service-4AT6LBPK-ns3/svc3/tcp/p80 ip daddr 172.30.0.43 tcp dport 80 ip saddr != 10.0.0.0/8 jump mark-for-masquerade
add rule ip kube-proxy service-4AT6LBPK-ns3/svc3/tcp/p80 numgen random mod 2 vmap { 0 : goto endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80 , 1 : goto endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80 }
add chain ip kube-proxy endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80
add rule ip kube-proxy endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80 ip saddr 10.0.3.2 jump mark-for-masquerade
add rule ip kube-proxy endpoint-SWWHDC7X-ns3/svc3/tcp/p80__10.0.3.2/80 meta l4proto tcp dnat to 10.0.3.2:80
add chain ip kube-proxy endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80
add rule ip kube-proxy endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80 ip saddr 10.0.3.3 jump mark-for-masquerade
add rule ip kube-proxy endpoint-TQ2QKHCZ-ns3/svc3/tcp/p80__10.0.3.3/80 meta l4proto tcp dnat to 10.0.3.3:80
add chain ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80
add rule ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80 ip daddr 172.30.0.44 tcp dport 80 ip saddr != 10.0.0.0/8 jump mark-for-masquerade
add rule ip kube-proxy service-LAUZTJTB-ns4/svc4/tcp/p80 numgen random mod 1 vmap { 0 : goto endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 }
add chain ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80
add rule ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 ip saddr 10.0.4.1 jump mark-for-masquerade
add rule ip kube-proxy endpoint-WAHRBT2B-ns4/svc4/tcp/p80__10.0.4.1/80 meta l4proto tcp dnat to 10.0.4.1:80
`)
assertNFTablesTransactionEqual(t, getLine(), expected, nft.Dump())
if len(fp.staleChains) != 0 {
t.Errorf("unexpected stale chains: %v", fp.staleChains)
}
// Empty a service's endpoints and restore it after stale chains age.
// - its chains will be flushed, but not immediately deleted in the first sync.
// - its chains will be deleted first, then recreated in the second sync.
fp.OnEndpointSliceUpdate(eps3update2, eps3update3)
fp.syncProxyRules()
ageStaleChains()
fp.OnEndpointSliceUpdate(eps3update3, eps3update2)
fp.syncProxyRules()
// The second change counteracts the first one, so same expected rules as last time
assertNFTablesTransactionEqual(t, getLine(), expected, nft.Dump())
// Sync with no new changes, so same expected rules as last time
fp.syncProxyRules()
assertNFTablesTransactionEqual(t, getLine(), expected, nft.Dump())