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Kubelet: only sync iptables on linux
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // +build linux | ||
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| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
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| package kubelet | ||
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| import ( | ||
| "fmt" | ||
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| "github.com/golang/glog" | ||
| utiliptables "k8s.io/kubernetes/pkg/util/iptables" | ||
| ) | ||
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| // syncNetworkUtil ensures the network utility are present on host. | ||
| // Network util includes: | ||
| // 1. In nat table, KUBE-MARK-DROP rule to mark connections for dropping | ||
| // Marked connection will be drop on INPUT/OUTPUT Chain in filter table | ||
| // 2. In nat table, KUBE-MARK-MASQ rule to mark connections for SNAT | ||
| // Marked connection will get SNAT on POSTROUTING Chain in nat table | ||
| func (kl *Kubelet) syncNetworkUtil() { | ||
| if kl.iptablesMasqueradeBit < 0 || kl.iptablesMasqueradeBit > 31 { | ||
| glog.Errorf("invalid iptables-masquerade-bit %v not in [0, 31]", kl.iptablesMasqueradeBit) | ||
| return | ||
| } | ||
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| if kl.iptablesDropBit < 0 || kl.iptablesDropBit > 31 { | ||
| glog.Errorf("invalid iptables-drop-bit %v not in [0, 31]", kl.iptablesDropBit) | ||
| return | ||
| } | ||
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| if kl.iptablesDropBit == kl.iptablesMasqueradeBit { | ||
| glog.Errorf("iptables-masquerade-bit %v and iptables-drop-bit %v must be different", kl.iptablesMasqueradeBit, kl.iptablesDropBit) | ||
| return | ||
| } | ||
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| // Setup KUBE-MARK-DROP rules | ||
| dropMark := getIPTablesMark(kl.iptablesDropBit) | ||
| if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubeMarkDropChain); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubeMarkDropChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubeMarkDropChain, "-j", "MARK", "--set-xmark", dropMark); err != nil { | ||
| glog.Errorf("Failed to ensure marking rule for %v: %v", KubeMarkDropChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureChain(utiliptables.TableFilter, KubeFirewallChain); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableFilter, KubeFirewallChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableFilter, KubeFirewallChain, | ||
| "-m", "comment", "--comment", "kubernetes firewall for dropping marked packets", | ||
| "-m", "mark", "--mark", dropMark, | ||
| "-j", "DROP"); err != nil { | ||
| glog.Errorf("Failed to ensure rule to drop packet marked by %v in %v chain %v: %v", KubeMarkDropChain, utiliptables.TableFilter, KubeFirewallChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableFilter, utiliptables.ChainOutput, "-j", string(KubeFirewallChain)); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableFilter, utiliptables.ChainOutput, KubeFirewallChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableFilter, utiliptables.ChainInput, "-j", string(KubeFirewallChain)); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableFilter, utiliptables.ChainInput, KubeFirewallChain, err) | ||
| return | ||
| } | ||
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| // Setup KUBE-MARK-MASQ rules | ||
| masqueradeMark := getIPTablesMark(kl.iptablesMasqueradeBit) | ||
| if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubeMarkMasqChain); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubeMarkMasqChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureChain(utiliptables.TableNAT, KubePostroutingChain); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s exists: %v", utiliptables.TableNAT, KubePostroutingChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubeMarkMasqChain, "-j", "MARK", "--set-xmark", masqueradeMark); err != nil { | ||
| glog.Errorf("Failed to ensure marking rule for %v: %v", KubeMarkMasqChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Prepend, utiliptables.TableNAT, utiliptables.ChainPostrouting, | ||
| "-m", "comment", "--comment", "kubernetes postrouting rules", "-j", string(KubePostroutingChain)); err != nil { | ||
| glog.Errorf("Failed to ensure that %s chain %s jumps to %s: %v", utiliptables.TableNAT, utiliptables.ChainPostrouting, KubePostroutingChain, err) | ||
| return | ||
| } | ||
| if _, err := kl.iptClient.EnsureRule(utiliptables.Append, utiliptables.TableNAT, KubePostroutingChain, | ||
| "-m", "comment", "--comment", "kubernetes service traffic requiring SNAT", | ||
| "-m", "mark", "--mark", masqueradeMark, "-j", "MASQUERADE"); err != nil { | ||
| glog.Errorf("Failed to ensure SNAT rule for packets marked by %v in %v chain %v: %v", KubeMarkMasqChain, utiliptables.TableNAT, KubePostroutingChain, err) | ||
| return | ||
| } | ||
| } | ||
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| // getIPTablesMark returns the fwmark given the bit | ||
| func getIPTablesMark(bit int) string { | ||
| value := 1 << uint(bit) | ||
| return fmt.Sprintf("%#08x/%#08x", value, value) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| // +build !linux | ||
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| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package kubelet | ||
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| // Do nothing. | ||
| func (kl *Kubelet) syncNetworkUtil() {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,5 @@ | ||
| // +build linux | ||
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| /* | ||
| Copyright 2016 The Kubernetes Authors. | ||
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