Method loop

scapy/packet.py:1178–1204

(todo, done, self=self)

        # type: () -> Iterator[Packet]
        """Iterates through all sub-packets generated by this Packet."""
        def loop(todo, done, self=self):
            # type: (List[str], Dict[str, Any], Any) -> Iterator[Packet]
            if todo:
                eltname = todo.pop()
                elt = self.getfieldval(eltname)
                if not isinstance(elt, Gen):
                    if self.get_field(eltname).islist:
                        elt = SetGen([elt])
                    else:
                        elt = SetGen(elt)
                for e in elt:
                    done[eltname] = e
                    for x in loop(todo[:], done):
                        yield x
            else:
                if isinstance(self.payload, NoPayload):
                    payloads = SetGen([None])  # type: SetGen[Packet]
                else:
                    payloads = self.payload
                for payl in payloads:
                    # Let's make sure subpackets are consistent
                    done2 = done.copy()
                    for k in done2:
                        if isinstance(done2[k], VolatileValue):
                            done2[k] = done2[k]._fix()
                    pkt = self.clone_with(payload=payl, **done2)
                    yield pkt

        if self.explicit or self.raw_packet_cache is not None:
            todo = []