code: func (h *Handle) AddrAdd(link Link, addr *Addr) error {
  	req := h.newNetlinkRequest(unix.RTM_NEWADDR, unix.NLM_F_CREATE|unix.NLM_F_EXCL|unix.NLM_F_ACK)
  	return h.addrHandle(link, addr, req)
  }
docs: // AddrAdd will add an IP address to a link device.
  // Equivalent to: `ip addr add $addr dev $link`