Date: Thu, 1 Mar 2001 13:30:45 +0100 From: Marco Molteni <molter@tin.it> To: freebsd-net@freebsd.org Subject: How to implement a transport protocol with netgraph? (2) Message-ID: <20010301133045.A1485@cobweb.example.org>
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[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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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