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checksumming part finish

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Nico Schottelius 2019-07-01 09:36:14 +02:00
commit 92e1407729
2 changed files with 112 additions and 11 deletions
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@ -384,6 +384,12 @@
| 2019-06-27 | | |
| | Target Hardware: code running | |
| | | |
| 2019-07-01 | | |
| | Meeting Laurent | |
| | | |
| | - Diff'ing in python | |
| | - Phasing in netpfga code | |
| | | |
| 2019-07-11 | | |
| | Integrated org-documentation into latex / export working | |
| | https://bastibe.de/2014-09-23-org-cite.html | |
@ -4893,6 +4899,33 @@ actual (tlast, tkeep, tdata) = (0, ffffffff, 000000000000000080fe403b0a0000000
*** 2019-06-24: find out how the expected/actual packet lines are generated
- afair: indirectly by running gen_testdata.py -> replace script
with port1
*** 2019-07-01: verify checksumming
#+BEGIN_CENTER
if struct.pack("H",1) == b"\x00\x01": # big endian
def checksum(pkt):
if len(pkt) % 2 == 1:
pkt += b"\0"
s = sum(array.array("H", pkt))
s = (s >> 16) + (s & 0xffff)
s += s >> 16
s = ~s
return s & 0xffff
else:
def checksum(pkt):
if len(pkt) % 2 == 1:
pkt += b"\0"
s = sum(array.array("H", pkt))
s = (s >> 16) + (s & 0xffff)
s += s >> 16
s = ~s
return (((s>>8)&0xff)|s<<8) & 0xffff
#+END_CENTER
*** 2019-07-01: 128 bit ipv6 struct -> no conversion!
- https://docs.python.org/2.7/library/struct.html
- .packed of ipaddress works
*** 2019-07-01: finish sum, use scapy checksum
*** 2019-07-01: meeting Laurent
** References / Follow up
*** RFC 791 IPv4 https://tools.ietf.org/html/rfc791
*** RFC 792 ICMP https://tools.ietf.org/html/rfc792