Date: Sat, 8 Mar 2008 17:19:41 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Documentation on writing a custom socket Message-ID: <20080308171435.J88526@fledge.watson.org> In-Reply-To: <200803081133.02575.hselasky@c2i.net> References: <200803081133.02575.hselasky@c2i.net>
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On Sat, 8 Mar 2008, Hans Petter Selasky wrote: > I'm planning to create a new socket type in FreeBSD called AF_Q921, which is > to be used for ISDN telephony. Where do I find documentation on how to > implement a new socket in the kernel ? I'd start with a copy of the Design and Implementation of FreeBSD, which contains a structural overview of how the protocol parts fit together. The Stevens TCP/IP implementation book is extremely out-of-date, but useful reading nontheless. The first thing to think about, BTW, is whether or not a new protocol is in fact what you want to do. Protocol families bring a lot of useful infrastructure to the table: an IPC model, a routing infrastructure, abstractions for "interfaces", etc. However, they may or may not be what you're looking for -- before going down this path I'd want to think very carefully about whether the requirements you have are best met in this way, or possibly better met by creating a new device abstraction that isn't connected to the protocol stack, or by using a device stack tied to Netgraph nodes. Could you tell us a bit more about what you're trying to do, and perhaps we can provide some useful pointers? For example, do you anticipate using or even needing the routing facilities, and how might you map ISDN telephony parts into the normal network stack infrastructure of addresses, routing, interfaces, etc? Robert N M Watson Computer Laboratory University of Cambridge
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