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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package controllers | ||
|
|
||
| import ( | ||
| "github.com/go-logr/logr" | ||
|
|
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| "github.com/kakao/network-node-manager/pkg/configs" | ||
| "github.com/kakao/network-node-manager/pkg/iptables" | ||
| ) | ||
|
|
||
| // Constants | ||
| const ( | ||
| ChainFilterInput = "INPUT" | ||
| ChainNATPrerouting = "PREROUTING" | ||
| ChainNATOutput = "OUTPUT" | ||
|
|
||
| ChainNATKubeMarkMasq = "KUBE-MARK-MASQ" | ||
|
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| ChainFilterBaseInput = "NMANAGER_INPUT" | ||
| ChainNATBasePrerouting = "NMANAGER_PREROUTING" | ||
| ChainNATBaseOutput = "NMANAGER_OUTPUT" | ||
|
|
||
| ChainFilterDropInvalidInput = "NMANAGER_DROP_INVALID_INPUT" | ||
| ChainNATExternalClusterPrerouting = "NMANAGER_EX_CLUS_PREROUTING" | ||
| ChainNATExternalClusterOutput = "NMANAGER_EX_CLUS_OUTPUT" | ||
| ) | ||
|
|
||
| func initBaseChains(logger logr.Logger) error { | ||
| // Get network stack config | ||
| configIPv4Enabled, configIPv6Enabled, err := configs.GetConfigNetStack() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // IPv4 | ||
| if configIPv4Enabled { | ||
| // Create base chain in tables | ||
| out, err := iptables.CreateChainIPv4(iptables.TableFilter, ChainFilterBaseInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| out, err = iptables.CreateChainIPv4(iptables.TableNAT, ChainNATBasePrerouting) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| out, err = iptables.CreateChainIPv4(iptables.TableNAT, ChainNATBaseOutput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Create jump rule to each chain in tables | ||
| ruleJumpFilterInput := []string{"-j", ChainFilterBaseInput} | ||
| out, err = iptables.CreateRuleFirstIPv4(iptables.TableFilter, ChainFilterInput, "", ruleJumpFilterInput...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| ruleJumpNATPre := []string{"-j", ChainNATBasePrerouting} | ||
| out, err = iptables.CreateRuleFirstIPv4(iptables.TableNAT, ChainNATPrerouting, "", ruleJumpNATPre...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| ruleJumpNATOut := []string{"-j", ChainNATBaseOutput} | ||
| out, err = iptables.CreateRuleFirstIPv4(iptables.TableNAT, ChainNATOutput, "", ruleJumpNATOut...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| } | ||
|
|
||
| // IPv6 | ||
| if configIPv6Enabled { | ||
| // Create base chain in nat table | ||
| out, err := iptables.CreateChainIPv6(iptables.TableFilter, ChainFilterBaseInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| out, err = iptables.CreateChainIPv6(iptables.TableNAT, ChainNATBasePrerouting) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| out, err = iptables.CreateChainIPv6(iptables.TableNAT, ChainNATBaseOutput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Create jump rule to each chain in nat table | ||
| ruleJumpFilterInput := []string{"-j", ChainFilterBaseInput} | ||
| out, err = iptables.CreateRuleFirstIPv6(iptables.TableFilter, ChainFilterInput, "", ruleJumpFilterInput...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| ruleJumpNATPre := []string{"-j", ChainNATBasePrerouting} | ||
| out, err = iptables.CreateRuleFirstIPv6(iptables.TableNAT, ChainNATPrerouting, "", ruleJumpNATPre...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| ruleJumpNATOut := []string{"-j", ChainNATBaseOutput} | ||
| out, err = iptables.CreateRuleFirstIPv6(iptables.TableNAT, ChainNATOutput, "", ruleJumpNATOut...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package controllers | ||
|
|
||
| import ( | ||
| "github.com/go-logr/logr" | ||
|
|
||
| "github.com/kakao/network-node-manager/pkg/iptables" | ||
| ) | ||
|
|
||
| func createRulesDropInvalidInput(logger logr.Logger) error { | ||
| if err := initBaseChains(logger); err != nil { | ||
| logger.Error(err, "failed to init base chain for externalIP to clusterIP Rules") | ||
| return err | ||
| } | ||
|
|
||
| // IPv4 | ||
| if configIPv4Enabled { | ||
| // Create chain | ||
| out, err := iptables.CreateChainIPv4(iptables.TableFilter, ChainFilterDropInvalidInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Set drop rule | ||
| ruleDrop := []string{"-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP"} | ||
| out, err = iptables.CreateRuleFirstIPv4(iptables.TableFilter, ChainFilterDropInvalidInput, "", ruleDrop...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Set jump rule | ||
| ruleJump := []string{"-j", ChainFilterDropInvalidInput} | ||
| out, err = iptables.CreateRuleFirstIPv4(iptables.TableFilter, ChainFilterBaseInput, "", ruleJump...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| // IPv6 | ||
| if configIPv6Enabled { | ||
| // Create chain | ||
| out, err := iptables.CreateChainIPv6(iptables.TableFilter, ChainFilterDropInvalidInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Set drop rule | ||
| ruleDrop := []string{"-m", "conntrack", "--ctstate", "INVALID", "-j", "DROP"} | ||
| out, err = iptables.CreateRuleFirstIPv6(iptables.TableFilter, ChainFilterDropInvalidInput, "", ruleDrop...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Set jump rule | ||
| ruleJump := []string{"-j", ChainFilterDropInvalidInput} | ||
| out, err = iptables.CreateRuleFirstIPv6(iptables.TableFilter, ChainFilterBaseInput, "", ruleJump...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
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| func deleteRulesDropInvalidInput(logger logr.Logger) error { | ||
| // IPv4 | ||
| if configIPv4Enabled { | ||
| // Delete jump rule | ||
| ruleJump := []string{"-j", ChainFilterDropInvalidInput} | ||
| out, err := iptables.DeleteRuleIPv4(iptables.TableFilter, ChainFilterBaseInput, "", ruleJump...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Delete chain | ||
| out, err = iptables.DeleteChainIPv4(iptables.TableFilter, ChainFilterDropInvalidInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| // IPv6 | ||
| if configIPv6Enabled { | ||
| // Delete jump rule | ||
| ruleJump := []string{"-j", ChainFilterDropInvalidInput} | ||
| out, err := iptables.DeleteRuleIPv6(iptables.TableFilter, ChainFilterBaseInput, "", ruleJump...) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
|
|
||
| // Delete chain | ||
| out, err = iptables.DeleteChainIPv6(iptables.TableFilter, ChainFilterDropInvalidInput) | ||
| if err != nil { | ||
| logger.Error(err, out) | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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