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vpc-shared-eni: Enable IP forwarding and ARP proxy when using L3 mode
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// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"). You may | ||
// not use this file except in compliance with the License. A copy of the | ||
// License is located at | ||
// | ||
// http://aws.amazon.com/apache2.0/ | ||
// | ||
// or in the "license" file accompanying this file. This file 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. | ||
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package ipcfg | ||
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import ( | ||
"bytes" | ||
"fmt" | ||
"io/ioutil" | ||
"strconv" | ||
) | ||
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const ( | ||
ipv4Forwarding = "/proc/sys/net/ipv4/conf/%s/forwarding" | ||
ipv4ProxyARP = "/proc/sys/net/ipv4/conf/%s/proxy_arp" | ||
) | ||
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// SetIPv4Forwarding sets the IPv4 forwarding property of an interface to the given value. | ||
func SetIPv4Forwarding(ifName string, value int) error { | ||
return set(fmt.Sprintf(ipv4Forwarding, ifName), value) | ||
} | ||
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// SetIPv4ProxyARP sets the IPv4 proxy ARP property of an interface to the given value. | ||
func SetIPv4ProxyARP(ifName string, value int) error { | ||
return set(fmt.Sprintf(ipv4ProxyARP, ifName), value) | ||
} | ||
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// Set sets a system variable to the given value. | ||
func set(name string, value int) error { | ||
valueStr := strconv.Itoa(value) | ||
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// Do not rewrite if the value is already set. | ||
currValue, err := ioutil.ReadFile(name) | ||
if err == nil && bytes.Equal(bytes.TrimSpace(currValue), []byte(valueStr)) { | ||
return nil | ||
} | ||
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return ioutil.WriteFile(name, []byte(valueStr), 0644) | ||
} |
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