Added Host NC communication support in Linux #374
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| package iptables | ||
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| // This package contains wrapper functions to program iptables rules | ||
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| import ( | ||
| "fmt" | ||
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| "github.com/Azure/azure-container-networking/log" | ||
| "github.com/Azure/azure-container-networking/platform" | ||
| ) | ||
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| // cni iptable chains | ||
| const ( | ||
| CNIInputChain = "AZURECNIINPUT" | ||
| CNIOutputChain = "AZURECNIOUTPUT" | ||
| ) | ||
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| // standard iptable chains | ||
| const ( | ||
| Input = "INPUT" | ||
| Output = "OUTPUT" | ||
| Forward = "FORWARD" | ||
| Prerouting = "PREROUTING" | ||
| Postrouting = "POSTROUTING" | ||
| ) | ||
|
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| // Standard Table names | ||
| const ( | ||
| Filter = "filter" | ||
| Nat = "nat" | ||
| ) | ||
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| // target | ||
| const ( | ||
| Accept = "ACCEPT" | ||
| Drop = "DROP" | ||
| Masquerade = "MASQUERADE" | ||
| ) | ||
|
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| // actions | ||
| const ( | ||
| Insert = "I" | ||
| Append = "A" | ||
| Delete = "D" | ||
| ) | ||
|
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| // states | ||
| const ( | ||
| Established = "ESTABLISHED" | ||
| Related = "RELATED" | ||
| ) | ||
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| const ( | ||
| iptables = "iptables" | ||
| lockTimeout = 60 | ||
| ) | ||
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| // Run iptables command | ||
| func runCmd(params string) error { | ||
| cmd := fmt.Sprintf("%s -w %d %s", iptables, lockTimeout, params) | ||
| if _, err := platform.ExecuteCommand(cmd); err != nil { | ||
| return err | ||
| } | ||
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| return nil | ||
| } | ||
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| // check if iptable chain alreay exists | ||
| func ChainExists(tableName, chainName string) bool { | ||
| params := fmt.Sprintf("-t %s -L %s", tableName, chainName) | ||
| if err := runCmd(params); err != nil { | ||
| return false | ||
| } | ||
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| return true | ||
| } | ||
|
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| // create new iptable chain under specified table name | ||
| func CreateChain(tableName, chainName string) error { | ||
| var err error | ||
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| if !ChainExists(tableName, chainName) { | ||
| params := fmt.Sprintf("-t %s -N %s", tableName, chainName) | ||
| err = runCmd(params) | ||
| } else { | ||
| log.Printf("%s Chain exists in table %s", chainName, tableName) | ||
| } | ||
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| return err | ||
| } | ||
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| // check if iptable rule alreay exists | ||
| func RuleExists(tableName, chainName, match, target string) bool { | ||
| params := fmt.Sprintf("-t %s -C %s %s -j %s", tableName, chainName, match, target) | ||
| if err := runCmd(params); err != nil { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
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| // Insert iptable rule at beginning of iptable chain | ||
| func InsertIptableRule(tableName, chainName, match, target string) error { | ||
| if RuleExists(tableName, chainName, match, target) { | ||
| log.Printf("Rule already exists") | ||
| return nil | ||
| } | ||
|
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| params := fmt.Sprintf("-t %s -I %s 1 %s -j %s", tableName, chainName, match, target) | ||
| return runCmd(params) | ||
| } | ||
|
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| // Append iptable rule at end of iptable chain | ||
| func AppendIptableRule(tableName, chainName, match, target string) error { | ||
| if RuleExists(tableName, chainName, match, target) { | ||
| log.Printf("Rule already exists") | ||
| return nil | ||
| } | ||
|
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| params := fmt.Sprintf("-t %s -A %s %s -j %s", tableName, chainName, match, target) | ||
| return runCmd(params) | ||
| } | ||
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| // Delete matched iptable rule | ||
| func DeleteIptableRule(tableName, chainName, match, target string) error { | ||
| params := fmt.Sprintf("-t %s -D %s %s -j %s", tableName, chainName, match, target) | ||
| return runCmd(params) | ||
| } | ||
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line?
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goformat automatically does that