63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
// 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"
|
|
"os"
|
|
|
|
current "github.com/containernetworking/cni/pkg/types/100"
|
|
)
|
|
|
|
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 {
|
|
isV4 := ip.Address.IP.To4() != nil
|
|
if isV4 && !v4 {
|
|
if err := EnableIP4Forward(); err != nil {
|
|
return err
|
|
}
|
|
v4 = true
|
|
} else if !isV4 && !v6 {
|
|
if err := EnableIP6Forward(); err != nil {
|
|
return err
|
|
}
|
|
v6 = true
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func echo1(f string) error {
|
|
if content, err := os.ReadFile(f); err == nil {
|
|
if bytes.Equal(bytes.TrimSpace(content), []byte("1")) {
|
|
return nil
|
|
}
|
|
}
|
|
return os.WriteFile(f, []byte("1"), 0o644)
|
|
}
|