code: func (h *Handle) LinkByIndex(index int) (Link, error) {
  	req := h.newNetlinkRequest(unix.RTM_GETLINK, unix.NLM_F_ACK)
  
  	msg := nl.NewIfInfomsg(unix.AF_UNSPEC)
  	msg.Index = int32(index)
  	req.AddData(msg)
  	attr := nl.NewRtAttr(unix.IFLA_EXT_MASK, nl.Uint32Attr(nl.RTEXT_FILTER_VF))
  	req.AddData(attr)
  
  	return execGetLink(req)
  }
docs: // LinkByIndex finds a link by index and returns a pointer to the object.