16680be42d
Path rewriting causes too many problems when vendoring vendored code. When CNI code is vendored into rkt, godep has problems code already vendored by CNI.
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ip
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import (
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"fmt"
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"net"
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"github.com/coreos/go-iptables/iptables"
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)
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// SetupIPMasq installs iptables rules to masquerade traffic
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// coming from ipn and going outside of it
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func SetupIPMasq(ipn *net.IPNet, chain string) error {
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ipt, err := iptables.New()
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if err != nil {
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return fmt.Errorf("failed to locate iptabes: %v", err)
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}
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if err = ipt.NewChain("nat", chain); err != nil {
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if err.(*iptables.Error).ExitStatus() != 1 {
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// TODO(eyakubovich): assumes exit status 1 implies chain exists
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return err
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}
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}
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if err = ipt.AppendUnique("nat", chain, "-d", ipn.String(), "-j", "ACCEPT"); err != nil {
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return err
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}
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if err = ipt.AppendUnique("nat", chain, "!", "-d", "224.0.0.0/4", "-j", "MASQUERADE"); err != nil {
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return err
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}
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return ipt.AppendUnique("nat", "POSTROUTING", "-s", ipn.String(), "-j", chain)
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}
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// TeardownIPMasq undoes the effects of SetupIPMasq
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func TeardownIPMasq(ipn *net.IPNet, chain string) error {
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ipt, err := iptables.New()
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if err != nil {
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return fmt.Errorf("failed to locate iptabes: %v", err)
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}
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if err = ipt.Delete("nat", "POSTROUTING", "-s", ipn.String(), "-j", chain); err != nil {
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return err
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}
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if err = ipt.ClearChain("nat", chain); err != nil {
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return err
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}
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return ipt.DeleteChain("nat", chain)
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}
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