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https://github.com/moby/moby.git
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29 lines
656 B
Go
29 lines
656 B
Go
package bridge
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import (
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"fmt"
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"io/ioutil"
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)
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const (
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ipv4ForwardConf = "/proc/sys/net/ipv4/ip_forward"
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ipv4ForwardConfPerm = 0644
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)
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func setupIPForwarding() error {
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// Get current IPv4 forward setup
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ipv4ForwardData, err := ioutil.ReadFile(ipv4ForwardConf)
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if err != nil {
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return fmt.Errorf("Cannot read IP forwarding setup: %v", err)
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}
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// Enable IPv4 forwarding only if it is not already enabled
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if ipv4ForwardData[0] != '1' {
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// Enable IPv4 forwarding
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if err := ioutil.WriteFile(ipv4ForwardConf, []byte{'1', '\n'}, ipv4ForwardConfPerm); err != nil {
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return fmt.Errorf("Setup IP forwarding failed: %v", err)
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}
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}
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return nil
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}
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