| 12345678910111213141516171819202122232425262728293031 |
- """Protocol Independent Multicast."""
- from pypacker import pypacker, checksum
- class PIM(pypacker.Packet):
- __hdr__ = (
- ("v_type", "B", 0x20),
- ("rsvd", "B", 0),
- ("sum", "H", 0) # _sum = sum
- )
- def __get_v(self):
- return self.v_type >> 4
- def __set_v(self, v):
- self.v_type = (v << 4) | (self.v_type & 0xf)
- v = property(__get_v, __set_v)
- def __get_type(self):
- return self.v_type & 0xf
- def __set_type(self, pimtype):
- self.v_type = (self.v_type & 0xf0) | pimtype
- type = property(__get_type, __set_type)
- def bin(self, update_auto_fields=True):
- if update_auto_fields and self._changed():
- self.sum = 0
- self.sum = checksum.in_cksum(pypacker.Packet.bin(self))
- return pypacker.Packet.bin(self, update_auto_fields=update_auto_fields)
|
