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Periodic Syncing of NPL iptables Rules
The iptables rules can be deleted by mistake. This patch is used to call a function to ensure that the rules are restored automatically in such a situation. Also integration test was added. Some fake pod data was taken and some initial iptables rules were added. Rules were deleted and we checked wheteher they were restored periodically. fixes antrea-io#2210
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| //go:build linux | ||
| // +build linux | ||
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|
||
| // Copyright 2022 Antrea 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. | ||
|
|
||
| package agent | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "testing" | ||
| "time" | ||
|
|
||
| nplcontroller "antrea.io/antrea/pkg/agent/nodeportlocal/k8s" | ||
| portcache "antrea.io/antrea/pkg/agent/nodeportlocal/portcache" | ||
| rules "antrea.io/antrea/pkg/agent/nodeportlocal/rules" | ||
| iptables "antrea.io/antrea/pkg/agent/util/iptables" | ||
| ) | ||
|
|
||
| func IntTest(t *testing.T) { | ||
| portTable, err := portcache.NewPortTable(61000, 62000) | ||
| if err != nil { | ||
| t.Fatalf("Failed to initialize porttable: %v", err) | ||
| } | ||
| nplCltr := nplcontroller.NewTestingNPLController(portTable) | ||
| stopCh := make(chan struct{}) | ||
| nplcontroller.SyncRuleInterval = 2 | ||
| nplCltr.SyncRules(stopCh) | ||
| time.Sleep(nplcontroller.SyncRuleInterval + 1*time.Second) | ||
| close(stopCh) | ||
| } | ||
|
|
||
| func TestNPLIptablesRestore(t *testing.T) { | ||
| portTable, err := portcache.NewPortTable(61000, 62000) | ||
| if err != nil { | ||
| t.Fatalf("Failed to initialize porttable: %v", err) | ||
| } | ||
| // get testing NPLController | ||
| synced := make(chan struct{}) | ||
| nplCltr := nplcontroller.NewTestingNPLController(portTable) | ||
| // add the static rules | ||
| err = portTable.PodPortRules.SyncFixedRules() | ||
| if err != nil { | ||
| t.Fatalf("Failed to add static rules: %v", err) | ||
| } | ||
| defer func() { | ||
| err := portTable.PodPortRules.DeleteAllRules() | ||
| if err != nil { | ||
| t.Fatalf("Failed to delete iptables rules: %v", err) | ||
| } | ||
| }() | ||
| // add some initial iptables rules from some fake pod data | ||
| allNPLPorts := []rules.PodNodePort{ | ||
| { | ||
| NodePort: 61001, | ||
| PodPort: 80, | ||
| PodIP: "20.0.0.1", | ||
| Protocols: []string{"tcp"}, | ||
| }, | ||
| { | ||
| NodePort: 61002, | ||
| PodPort: 80, | ||
| PodIP: "21.0.0.2", | ||
| Protocols: []string{"tcp", "udp"}, | ||
| }, | ||
| } | ||
| err = portTable.RestoreRules(allNPLPorts, synced) | ||
| if err != nil { | ||
| t.Fatalf("Failed to add iptables rules %v", err) | ||
| } | ||
| t.Logf("Waiting for portTable to set NPL iptables rules") | ||
| <-synced | ||
| t.Logf("Success set NPL iptables rules") | ||
| // delete iptables rules including the static rules | ||
| err = portTable.PodPortRules.DeleteAllRules() | ||
| if err != nil { | ||
| t.Fatalf("Failed to delete iptables rules: %v", err) | ||
| } | ||
| nplcontroller.SyncRuleInterval = 2 * time.Second | ||
| stopCh := make(chan struct{}) | ||
| defer close(stopCh) | ||
| nplCltr.SyncRules(stopCh) | ||
| t.Logf("Waiting for NPLController to recover NPL iptables rules") | ||
| time.Sleep(nplcontroller.SyncRuleInterval + 1*time.Second) | ||
| t.Logf("Checking if NPL iptables rules are recovered") | ||
| // check if NPL chain is present. | ||
| ipt, err := iptables.New(true, false) | ||
| exists, err := ipt.ChainExists(iptables.ProtocolIPv4, iptables.NATTable, rules.NodePortLocalChain) | ||
| if exists { | ||
| t.Logf("NPL chain exists in nat table.") | ||
| } else { | ||
| t.Fatalf("error checking if NPL chain exists in nat table ") | ||
| } | ||
|
|
||
| //Check if static rules are restored. | ||
| rulespec := []string{ | ||
| "-p", "all", "-m", "addrtype", "--dst-type", "LOCAL", "-j", rules.NodePortLocalChain, | ||
| } | ||
| exists, err = ipt.Exists(iptables.ProtocolIPv4, iptables.NATTable, iptables.PreRoutingChain, rulespec) | ||
| if exists { | ||
| t.Logf(" Static rules successfully restored in PreRouting chain") | ||
| } else { | ||
| t.Fatalf("Failed to restore static rules in PreRouting Chain ") | ||
| } | ||
|
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| exists, err = ipt.Exists(iptables.ProtocolIPv4, iptables.NATTable, iptables.OutputChain, rulespec) | ||
| if exists { | ||
| t.Logf(" Static rules successfully restored in Output chain") | ||
| } else { | ||
| t.Fatalf("Failed to restore static rules in Output Chain ") | ||
| } | ||
|
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||
| //Check if dynamic rules are restored. | ||
| rulespec1 := []string{ | ||
| "-p", "tcp", "-m", "tcp", "--dport", fmt.Sprint("61001"), | ||
| "-j", "DNAT", "--to-destination", "20.0.0.1:80", | ||
| } | ||
| exists, err = ipt.Exists(iptables.ProtocolIPv4, iptables.NATTable, rules.NodePortLocalChain, rulespec1) | ||
| if exists { | ||
| t.Logf(" Dynamic rule 1 successfully restored in NPL chain") | ||
| } else { | ||
| t.Fatalf("Failed to restore dynamic rule 1 in NPL Chain ") | ||
| } | ||
| rulespec2 := []string{ | ||
| "-p", "tcp", "-m", "tcp", "--dport", fmt.Sprint("61002"), | ||
| "-j", "DNAT", "--to-destination", "21.0.0.2:80", | ||
| } | ||
| exists, err = ipt.Exists(iptables.ProtocolIPv4, iptables.NATTable, rules.NodePortLocalChain, rulespec2) | ||
| if exists { | ||
| t.Logf(" Dynamic rule 2 successfully restored in NPL chain") | ||
| } else { | ||
| t.Fatalf("Failed to restore dynamic rule 2 in NPL Chain ") | ||
| } | ||
| rulespec3 := []string{ | ||
| "-p", "udp", "-m", "udp", "--dport", fmt.Sprint("61002"), | ||
| "-j", "DNAT", "--to-destination", "21.0.0.2:80", | ||
| } | ||
| exists, err = ipt.Exists(iptables.ProtocolIPv4, iptables.NATTable, rules.NodePortLocalChain, rulespec3) | ||
| if exists { | ||
| t.Logf(" Dynamic rule 3 successfully restored in NPL chain") | ||
| } else { | ||
| t.Fatalf("Failed to restore dynamic rule 3 in NPL Chain ") | ||
| } | ||
| } |