func printBytesOption(opt string, k []byte, m []byte, f func([]byte) string) {
if !odp.AllBytes(m, 0) {
if odp.AllBytes(m, 0xff) {
fmt.Printf(" --%s=%s", opt, f(k))
} else {
fmt.Printf(" --%s=\"%s&%s\"", opt, f(k), f(m))
}
}
}
func parseSetTunnelFlags(tf *tunnelFlags) (*odp.SetTunnelAction, error) {
fk, err := parseTunnelFlags(tf)
if err != nil {
return nil, err
}
a := odp.SetTunnelAction{TunnelAttrs: fk.Key()}
m := fk.Mask()
foundMask := false
present := func(exact, ignored bool) bool {
if exact {
return true
} else if ignored {
return false
} else {
foundMask = true
return false
}
}
bytesPresent := func(b []byte) bool {
return present(odp.AllBytes(b, 0xff), odp.AllBytes(b, 0))
}
a.Present.TunnelId = bytesPresent(m.TunnelId[:])
a.Present.Ipv4Src = bytesPresent(m.Ipv4Src[:])
a.Present.Ipv4Dst = bytesPresent(m.Ipv4Dst[:])
a.Present.Tos = present(m.Tos == 0xff, m.Tos == 0)
a.Present.Ttl = present(m.Ttl == 0xff, m.Ttl == 0)
a.Present.Df = m.Df
a.Present.Csum = m.Csum
a.Present.TpSrc = present(m.TpSrc == 0xffff, m.TpSrc == 0)
a.Present.TpDst = present(m.TpDst == 0xffff, m.TpDst == 0)
if foundMask {
return nil, fmt.Errorf("--set-tunnel option includes a mask")
}
if a.Present.TunnelId || a.Present.Ipv4Src || a.Present.Ipv4Dst ||
a.Present.Tos || a.Present.Ttl ||
a.Present.Df || a.Present.Csum ||
a.Present.TpSrc || a.Present.TpDst {
return &a, nil
} else {
return nil, nil
}
}