def __str__(self):
if self.nxt == 6 or self.nxt == 17 or self.nxt == 58:
# XXX - set TCP, UDP, and ICMPv6 checksums
p = str(self.data)
s = _ip_cksum_add(0, self.src + self.dst)
s = _ip_cksum_add(s, p)
try: self.data.sum = _ip_cksum_done(s + self.p + len(p))
except AttributeError: pass
return Packet.__str__(self)
def __str__(self):
if not self.sum:
if self.p == 6 or self.p == 17 and self.data.sum == 0 and \
self.off & (IP_MF|IP_OFFMASK) == 0:
try:
# Set zeroed TCP and UDP checksums for non-fragments.
s = _ip_cksum_add(self.data.sum, self.src + self.dst)
p = str(self.data)
s = _ip_cksum_add(s, p)
self.data.sum = _ip_cksum_done(s + self.p + len(p))
if self.p == 17 and not self.data.sum:
self.data.sum = 0xffff # RFC 768
except AttributeError:
pass
self.sum = _ip_cksum(self.pack_hdr())
return self.pack_hdr() + self.opts + str(self.data)