[Since I didn't received a reply on my first posting, I am trying once more]
Hi all,
I have to implement a kernel version of the transport protocol SCTP
(Stream Control Transmission Protocol, RFC 2960), plus a socket
interface to it as in draft-ietf-stewart-sctpsocket-sigtran-01.txt
(the RFC has an ad hoc user interface).
It seems to me that the modularity of netgraph would help a lot in
this project, as opposed to go hacking half the kernel networking
stack to put SCTP in it (and yes, this is my first big project in
kernel land).
I read the netgraph blueprint article on Daemonnews and the various
netgraph manpages. The problem is that all the examples and
applications I could find are layer 2 and layer 3, there is no example
of a transport protocol done with netgraph.
Since SCTP is reliable, at the very minimum I will have to handle
timers, buffers, retransmissions and friends.
So my questions are:
o Any example of a transport protocol done with netgraph, or any hints
(the more detailed the better :-) on how to tackle this task? Is
netgraph suited for this (I think yes) ?
o Let's say the socket interface will be something like
sd = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP)
How (or where) do I connect the socket system call to the netgraph
framework?
Thanks for the help
Marco
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