63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// Copyright 2015 CNI authors
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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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"bytes"
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"io/ioutil"
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current "github.com/containernetworking/cni/pkg/types/100"
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)
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func EnableIP4Forward() error {
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return echo1("/proc/sys/net/ipv4/ip_forward")
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}
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func EnableIP6Forward() error {
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return echo1("/proc/sys/net/ipv6/conf/all/forwarding")
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}
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// EnableForward will enable forwarding for all configured
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// address families
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func EnableForward(ips []*current.IPConfig) error {
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v4 := false
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v6 := false
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for _, ip := range ips {
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isV4 := ip.Address.IP.To4() != nil
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if isV4 && !v4 {
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if err := EnableIP4Forward(); err != nil {
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return err
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}
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v4 = true
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} else if !isV4 && !v6 {
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if err := EnableIP6Forward(); err != nil {
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return err
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}
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v6 = true
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}
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}
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return nil
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}
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func echo1(f string) error {
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if content, err := ioutil.ReadFile(f); err == nil {
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if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
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return nil
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}
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}
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return ioutil.WriteFile(f, []byte("1"), 0644)
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}
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