def set_checksum(self, cks_v):
if self.pi.o_kind != KIND_PKT:
raise PltError("Object didn't come from a plt Packet")
if not self.check_ip(12):
raise PltError("Data too short to set IP checksum")
if cks_v < 0 or cks_v > 0xFFFF:
raise PltError("Checksum not 16-bit unsigned integer")
lib.set_short(self.pi.l3p, 10, cks_v)
return None
def set_traffic_class(self, new_val):
version = self.check_inet(2, 2)
if version == 4:
self.pi.l3p[1] = new_val
elif version == 6:
val = lib.get_short(self.pi.l3p, 0)
lib.set_short(self.pi.l3p, 0, (val & 0xF00F) | (new_val << 4))
else:
raise PltError("Data too short to set traffic_class")
return None
def set_checksum(self, cks_v):
self.check_tcp(18)
if cks_v < 0 or cks_v > 0xFFFF:
raise PltError("Checksum not 16-bit unsigned integer")
lib.set_short(self.pi.dp, 16, cks_v)
return None
def set_short(ca, bx, x): # Set 16-bit integer into cdata uint8_t[]
lib.set_short(ca, bx, x)