def _import_next_layer(self, proto, length=None):
from pcapkit.protocols.raw import Raw<EOL>next_ = Raw(io.BytesIO(self._read_fileng(length)), length,<EOL>layer=self._exlayer, protocol=self._exproto)<EOL>return next_<EOL>
Import next layer extractor.

        Positional arguments:
            * proto -- str, next layer protocol name
            * length -- int, valid (not padding) length

        Returns:
            * bool -- flag if extraction of next layer succeeded
            * Protocol -- instance of next layer