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# $Id: pim.py 23 2006-11-08 15:45:33Z dugsong $
"""Protocol Independent Multicast."""
import dpkt
class PIM(dpkt.Packet):
__hdr__ = (
('v_type', 'B', 0x20),
('rsvd', 'B', 0),
('sum', 'H', 0)
)
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, type): self.v_type = (self.v_type & 0xf0) | type
type = property(_get_type, _set_type)
def __str__(self):
if not self.sum:
self.sum = dpkt.in_cksum(dpkt.Packet.__str__(self))
return dpkt.Packet.__str__(self)
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