site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Hi Brian, -josh On Mar 2, 2006, at 12:56 AM, Brian Doyle wrote: Hello, Any help will be greatly appreciated, thanks!! -b _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com You can use a dynamically allocated large value. I believe the best way to get one of these values is to use kev_vendor_code_find. This will give you a unique 32bit value that you can use for the protocol family. There should be a better way to coordinate protocol families, but there isn't. The protocol family is just used for intermediate matching. The packet comes it, is it matched against ethernet demux descriptors. When it finds one that matches, the protocol family is returned. The interface then looks for the input function that was registered for that protocol family, the one you specified when attaching your protocol to the interface. Don't use PF_NDRV, that will really screw things up. A specific protocol family can only attach once, if you use PF_NDRV, that will prevent everything else that uses PF_NDRV from working. I'm writing a driver that needs to read and write raw ethernet frames. After reading source code all day I've come to the conclusion that hooking in to the dlil with ifnet_attach_protocol() would be great, except that ether_demux() dispatches to protocol handlers by looking at both the ethernet type field and the protocol family that was specified when the protocol was registered. For my purposes I want to send and receive frames that have a specific ethernet type (IANA registered but non-standard). There are no registered protocol families for this type however. My question is, what should I use for the protocol family (if in fact hooking in via ifnet_attach_protocol() is the correct thing to do)? I could use PF_NDRV which seems to be for raw frames, but if I do I suspect that will conflict with userland processes that wish to use PF_NDRV at the socket level. I could also just use a value greater than AF_MAX, but that seems a bit dodgy as it might collide later with something else. If I'm thinking about this all wrong I'd love to hear some other ideas. I *do* need to be in the kernel as I'm interfacing with other drivers but all I need is to send and receive ethernet frames with a specific type while not interfering with the rest of the network stack. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/jgraessley% 40apple.com This email sent to jgraessley@apple.com smime.p7s