def compute_checksum(self):
self.header_checksum.val = 0
packet = self.raw_val(parents=False)
self.header_checksum.val = utils.cksum(packet)
return self.header_checksum.val
def compute_checksum(self):
self.checksum.val = 0
ipv4_pseudo_header = '%s%s\x00%s%s' % (
self._parent.saddr.raw_val(),
self._parent.daddr.raw_val(),
self._parent.protocol.raw_val('B'),
fields.Int(self.length.val).raw_val('!H'),
)
self.checksum.val = utils.cksum(ipv4_pseudo_header + self.raw_val(parents=False) + self.payload)
return self.checksum.val
def compute_checksum(self):
self.checksum = fields.HexIntClass(0, 4)
packet = self.raw_val(parents=False) + self.payload
self.checksum.val = utils.cksum(packet)
return self.checksum