On Thu, 1 Mar 2001, Marco Molteni wrote:
MM>[Since I didn't received a reply on my first posting, I am trying once more]
MM>
MM>Hi all,
MM>
MM>I have to implement a kernel version of the transport protocol SCTP
MM>(Stream Control Transmission Protocol, RFC 2960), plus a socket
MM>interface to it as in draft-ietf-stewart-sctpsocket-sigtran-01.txt
MM>(the RFC has an ad hoc user interface).
MM>
MM>It seems to me that the modularity of netgraph would help a lot in
MM>this project, as opposed to go hacking half the kernel networking
MM>stack to put SCTP in it (and yes, this is my first big project in
MM>kernel land).
MM>
MM>I read the netgraph blueprint article on Daemonnews and the various
MM>netgraph manpages. The problem is that all the examples and
MM>applications I could find are layer 2 and layer 3, there is no example
MM>of a transport protocol done with netgraph.
MM>
MM>Since SCTP is reliable, at the very minimum I will have to handle
MM>timers, buffers, retransmissions and friends.
MM>
MM>So my questions are:
MM>
MM>o Any example of a transport protocol done with netgraph, or any hints
MM> (the more detailed the better :-) on how to tackle this task? Is
MM> netgraph suited for this (I think yes) ?
MM>
MM>o Let's say the socket interface will be something like
MM> sd = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP)
MM> How (or where) do I connect the socket system call to the netgraph
MM> framework?
MM>
MM>Thanks for the help
MM>Marco
I have implemented SSCOP for ATM signalling in netgraph lately. If it
helps you, I can send you the current code. There are however still a
number of issues:
- It has no socket interface yet. I plan to do one base on the ng_socket
code. There should be a lot of similarities.
- How to do flow control is not very clear up to now. There are a number
of messages defined in netgraph.h for this and I have used them, but
had no time to do a thourough test.
harti
--
harti brandt, http://www.fokus.gmd.de/research/cc/cats/employees/hartmut.brandt/private
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