// CleanupLeftovers removes all iptables rules and chains created by the Proxier
// It returns true if an error was encountered. Errors are logged.
func CleanupLeftovers(ipt iptables.Interface) (encounteredError bool) {
// NOTE: Warning, this needs to be kept in sync with the userspace Proxier,
// we want to ensure we remove all of the iptables rules it creates.
// Currently they are all in iptablesInit()
// Delete Rules first, then Flush and Delete Chains
args := []string{"-m", "comment", "--comment", "handle ClusterIPs; NOTE: this must be before the NodePort rules"}
if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainOutput, append(args, "-j", string(iptablesHostPortalChain))...); err != nil {
glog.Errorf("Error removing userspace rule: %v", err)
encounteredError = true
}
if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainPrerouting, append(args, "-j", string(iptablesContainerPortalChain))...); err != nil {
glog.Errorf("Error removing userspace rule: %v", err)
encounteredError = true
}
args = []string{"-m", "addrtype", "--dst-type", "LOCAL"}
args = append(args, "-m", "comment", "--comment", "handle service NodePorts; NOTE: this must be the last rule in the chain")
if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainOutput, append(args, "-j", string(iptablesHostNodePortChain))...); err != nil {
glog.Errorf("Error removing userspace rule: %v", err)
encounteredError = true
}
if err := ipt.DeleteRule(iptables.TableNAT, iptables.ChainPrerouting, append(args, "-j", string(iptablesContainerNodePortChain))...); err != nil {
glog.Errorf("Error removing userspace rule: %v", err)
encounteredError = true
}
// flush and delete chains.
chains := []iptables.Chain{iptablesContainerPortalChain, iptablesHostPortalChain, iptablesHostNodePortChain, iptablesContainerNodePortChain}
for _, c := range chains {
// flush chain, then if sucessful delete, delete will fail if flush fails.
if err := ipt.FlushChain(iptables.TableNAT, c); err != nil {
glog.Errorf("Error flushing userspace chain: %v", err)
encounteredError = true
} else {
if err = ipt.DeleteChain(iptables.TableNAT, c); err != nil {
glog.Errorf("Error deleting userspace chain: %v", err)
encounteredError = true
}
}
}
return encounteredError
}
// Flush all of our custom iptables rules.
func iptablesFlush(ipt iptables.Interface) error {
el := []error{}
if err := ipt.FlushChain(iptables.TableNAT, iptablesContainerPortalChain); err != nil {
el = append(el, err)
}
if err := ipt.FlushChain(iptables.TableNAT, iptablesHostPortalChain); err != nil {
el = append(el, err)
}
if err := ipt.FlushChain(iptables.TableNAT, iptablesContainerNodePortChain); err != nil {
el = append(el, err)
}
if err := ipt.FlushChain(iptables.TableNAT, iptablesHostNodePortChain); err != nil {
el = append(el, err)
}
if len(el) != 0 {
glog.Errorf("Some errors flushing old iptables portals: %v", el)
}
return errors.NewAggregate(el)
}