/
cleanup.go
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/
cleanup.go
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// Copyright Istio 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 cmd
import (
"istio.io/istio/tools/istio-clean-iptables/pkg/config"
"istio.io/istio/tools/istio-iptables/pkg/builder"
common "istio.io/istio/tools/istio-iptables/pkg/capture"
"istio.io/istio/tools/istio-iptables/pkg/constants"
dep "istio.io/istio/tools/istio-iptables/pkg/dependencies"
)
func flushAndDeleteChains(ext dep.Dependencies, cmd string, table string, chains []string) {
for _, chain := range chains {
ext.RunQuietlyAndIgnore(cmd, "-t", table, "-F", chain)
ext.RunQuietlyAndIgnore(cmd, "-t", table, "-X", chain)
}
}
func removeOldChains(cfg *config.Config, ext dep.Dependencies, cmd string) {
// Remove the old TCP rules
for _, table := range []string{constants.NAT, constants.MANGLE} {
ext.RunQuietlyAndIgnore(cmd, "-t", table, "-D", constants.PREROUTING, "-p", constants.TCP, "-j", constants.ISTIOINBOUND)
}
ext.RunQuietlyAndIgnore(cmd, "-t", constants.NAT, "-D", constants.OUTPUT, "-p", constants.TCP, "-j", constants.ISTIOOUTPUT)
redirectDNS := cfg.RedirectDNS
// Remove the old DNS UDP rules
if redirectDNS {
common.HandleDNSUDP(common.DeleteOps, builder.NewIptablesBuilder(nil), ext, cmd, cfg.ProxyUID, cfg.ProxyGID,
cfg.DNSServersV4, cfg.DNSServersV6, cfg.CaptureAllDNS)
}
// Flush and delete the istio chains from NAT table.
chains := []string{constants.ISTIOOUTPUT, constants.ISTIOINBOUND}
flushAndDeleteChains(ext, cmd, constants.NAT, chains)
// Flush and delete the istio chains from MANGLE table.
chains = []string{constants.ISTIOINBOUND, constants.ISTIODIVERT, constants.ISTIOTPROXY}
flushAndDeleteChains(ext, cmd, constants.MANGLE, chains)
// Must be last, the others refer to it
chains = []string{constants.ISTIOREDIRECT, constants.ISTIOINREDIRECT}
flushAndDeleteChains(ext, cmd, constants.NAT, chains)
}
func cleanup(cfg *config.Config) {
var ext dep.Dependencies
if cfg.DryRun {
ext = &dep.StdoutStubDependencies{}
} else {
ext = &dep.RealDependencies{}
}
defer func() {
for _, cmd := range []string{constants.IPTABLESSAVE, constants.IP6TABLESSAVE} {
// iptables-save is best efforts
_ = ext.Run(cmd)
}
}()
for _, cmd := range []string{constants.IPTABLES, constants.IP6TABLES} {
removeOldChains(cfg, ext, cmd)
}
}