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Separate UDP pseudo header checksum computation

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This commit is contained in:
Alex Forencich 2019-07-29 18:53:32 -07:00
parent 562e713837
commit bfef06ca0e
1 changed files with 17 additions and 4 deletions
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21
tb/udp_ep.py
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@ -156,13 +156,27 @@ class UDPFrame(object):
cksum = (cksum & 0xffff) + (cksum >> 16)
return ~cksum & 0xffff
def calc_udp_checksum(self):
def update_ip_checksum(self):
self.ip_header_checksum = self.calc_ip_checksum()
def calc_udp_pseudo_header_checksum(self):
cksum = self.ip_source_ip & 0xffff
cksum += (self.ip_source_ip >> 16) & 0xffff
cksum += self.ip_dest_ip & 0xffff
cksum += (self.ip_dest_ip >> 16) & 0xffff
cksum += self.ip_protocol
cksum += self.udp_length
cksum = (cksum & 0xffff) + (cksum >> 16)
cksum = (cksum & 0xffff) + (cksum >> 16)
return cksum
def set_udp_pseudo_header_checksum(self):
if self.udp_length is None:
self.update_udp_length()
self.udp_checksum = self.calc_udp_pseudo_header_checksum()
def calc_udp_checksum(self):
cksum = self.calc_udp_pseudo_header_checksum()
cksum += self.udp_source_port
cksum += self.udp_dest_port
cksum += self.udp_length
@ -177,10 +191,9 @@ class UDPFrame(object):
cksum = (cksum & 0xffff) + (cksum >> 16)
return ~cksum & 0xffff
def update_ip_checksum(self):
self.ip_header_checksum = self.calc_ip_checksum()
def update_udp_checksum(self):
if self.udp_length is None:
self.update_udp_length()
self.udp_checksum = self.calc_udp_checksum()
def update_checksum(self):