[Ns-developers] Checksum patch

[Sébastien Vincent]

Hello,

As Mathieu said in a past mail for a new way of calculating checksum for 
IPv4, UDP and TCP.

I quote :
"

Looking at this issue more carefully, a nice way to go forward would be
to:
  - move the function Ipv4Header::ChecksumCalculate to the
Buffer::Iterator class as a non-static member method name
CalculateIpChecksum.
  - make the Ipv4Header code use this new method
  - make the udp and tcp header code use this new method in IsChecksumOk
  - re-implement InitializeChecksum in UdpHeader and TcpHeader by
creating a raw temporary instance of a Buffer, call Buffer::Begin (),
and serialize the source, dest, and payload fields, call
Iterator::CalculateIpChecksum
  - remove the UdpHeader::m_ipv6 variable (and the UdpHeader::SetIpv6
method, obviously). The same for TcpHeader.
  - kill ipv4-checksum.* and ipv6-checksum.*

"

I propose a patch that do this stuff. The code is located at https://svnet.u-strasbg.fr/hg/ns-3-checksum (it is based on last ns-3-dev).

Comments are welcome.

Regards, 
--
Sebastien Vincent
Network and Protocol Team, University of Strasbourg, France