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// Copyright 2015 CNI 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 ip
import (
"bytes"
"io/ioutil"
"github.com/containernetworking/cni/pkg/types/current"
)
func EnableIP4Forward() error {
return echo1("/proc/sys/net/ipv4/ip_forward")
}
func EnableIP6Forward() error {
return echo1("/proc/sys/net/ipv6/conf/all/forwarding")
}
// EnableForward will enable forwarding for all configured
// address families
func EnableForward(ips []*current.IPConfig) error {
v4 := false
v6 := false
for _, ip := range ips {
if ip.Version == "4" && !v4 {
if err := EnableIP4Forward(); err != nil {
return err
}
v4 = true
} else if ip.Version == "6" && !v6 {
if err := EnableIP6Forward(); err != nil {
return err
}
v6 = true
}
}
return nil
}
func echo1(f string) error {
if content, err := ioutil.ReadFile(f); err == nil {
if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
return nil
}
}
return ioutil.WriteFile(f, []byte("1"), 0644)
}
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