Hello,
On 22/04/14 - 05:27:55, Madhan wrote:
> hi ,
> Is it possible to update the option field of the tcp header dynamically by the driver rather than the change in tcp/ip stack .
> i.e Can i add a driver to implement mptcp rather than building entire kernel again ?
in principle it seems possible to do this at a driver-level. Alcatel-Lucent
implemented something similar using netfilter-hooks:
https://open-innovation.alcatel-lucent.com/projects/mptcp-proxy
Regular TCP was running on top, and the netfilter hooks allowed to
rewrite the TCP/IP header.
However, I think that doing it that way will be huge implementation effort
(considering that there exists already an open-source implementation at
multipath-tcp.org) and it might be hard to achieve good performance and make it
scale properly.
You basically have to reimplement a full TCP-stack at the driver as each
TCP-subflow has to behave as regular TCP (3-way handshake, retransmissions,...)
Cheers,
Christoph