func setupIpMasq(localNet ip.IP4Net, overlayNet ip.IP4Net) error {
ipt, err := ip.NewIPTables()
if err != nil {
return err
}
err = ipt.ClearChain("nat", "FLANNEL")
if err != nil {
return fmt.Errorf("Failed to create/clear FLANNEL chain in NAT table: %v", err)
}
rules := [][]string{
[]string{"FLANNEL", "-s", localNet.String(), "-o", "lo", "-j", "ACCEPT"},
[]string{"FLANNEL", "-s", localNet.String(), "!", "-d", overlayNet.String(), "-j", "MASQUERADE"},
[]string{"POSTROUTING", "-s", localNet.String(), "-j", "FLANNEL"},
}
for _, args := range rules {
log.Info("Adding iptables rule: ", strings.Join(args, " "))
if err := ipt.AppendUnique("nat", args...); err != nil {
return fmt.Errorf("Failed to insert IP masquerade rule: %v", err)
}
}
return nil
}
func setupIpMasq(ipn ip.IP4Net, iface string) error {
ipt, err := ip.NewIPTables()
if err != nil {
return fmt.Errorf("failed to setup IP Masquerade. iptables was not found")
}
err = ipt.ClearChain("nat", "FLANNEL")
if err != nil {
return fmt.Errorf("Failed to create/clear FLANNEL chain in NAT table: %v", err)
}
rules := [][]string{
// This rule makes sure we don't NAT traffic within overlay network (e.g. coming out of docker0)
{"FLANNEL", "-d", ipn.String(), "-j", "ACCEPT"},
// This rule makes sure we don't NAT multicast traffic within overlay network
{"FLANNEL", "-d", "224.0.0.0/4", "-j", "ACCEPT"}, // This rule will NAT everything originating from our overlay network and
{"FLANNEL", "!", "-o", iface, "-j", "MASQUERADE"},
// This rule will take everything coming from overlay and sent it to FLANNEL chain
{"POSTROUTING", "-s", ipn.String(), "-j", "FLANNEL"},
}
for _, args := range rules {
log.Info("Adding iptables rule: ", strings.Join(args, " "))
err = ipt.AppendUnique("nat", args...)
if err != nil {
return fmt.Errorf("Failed to insert IP masquerade rule: %v", err)
}
}
return nil
}