code: def nl_cb_call(cb, type_, msg):
      
      cb.cb_active = type_
      ret = cb.cb_set[type_](msg, cb.cb_args[type_])
      cb.cb_active = 10 + 1  # NL_CB_TYPE_MAX + 1
      return int(ret)
docs: Call a callback function.
  
      https://github.com/thom311/libnl/blob/libnl3_2_25/include/netlink-private/netlink.h#L136
  
      Positional arguments:
      cb -- nl_cb class instance.
      type_ -- callback type integer (e.g. NL_CB_MSG_OUT).
      msg -- Netlink message (nl_msg class instance).
  
      Returns:
      Integer from the callback function (like NL_OK, NL_SKIP, etc).