code: func (h *netlinkHandle) EnsureAddressBind(address, devName string) (exist bool, err error) {
  	dev, err := h.LinkByName(devName)
  	if err != nil {
  		return false, fmt.Errorf("error get interface: %s, err: %v", devName, err)
  	}
  	addr := net.ParseIP(address)
  	if addr == nil {
  		return false, fmt.Errorf("error parse ip address: %s", address)
  	}
  	if err := h.AddrAdd(dev, &netlink.Addr{IPNet: netlink.NewIPNet(addr)}); err != nil {
  		// "EEXIST" will be returned if the address is already bound to device
  		if err == unix.EEXIST {
  			return true, nil
  		}
  		return false, fmt.Errorf("error bind address: %s to interface: %s, err: %v", address, devName, err)
  	}
  	return false, nil
  }
docs: // EnsureAddressBind checks if address is bound to the interface and, if not, binds it. If the address is already bound, return true.