site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Thread-index: AcU+8R0Q8pHoKVbqS1GvkAvCaK5GoAAcNrqw Thread-topic: Interface filtering " Since you are using an interface filter, then the packets you get from a specific interface are either all from a wireless connection, or none are. Perhaps I am missing the point of your question." Well you could have a situation where the machine is both wired, DSL cable or something, and unwired, having a wireless nic card installed, so in my case there is a en0 and a en1. So if I only wanted to intercept the packets from the wireless card, I was wondering if there was some way I could do that. But it sounds like maybe not. Thanks for the information Carl -----Original Message----- From: darwin-kernel-bounces+csmith=fortresstech.com@lists.apple.com [mailto:darwin-kernel-bounces+csmith=fortresstech.com@lists.apple.com] On Behalf Of Justin Walker Sent: Monday, April 11, 2005 7:50 PM To: darwin-kernel Dev Subject: Re: Interface filtering On Apr 11, 2005, at 16:23, Carl Smith wrote:
I have my Ethernet interface filtering in place and am trapping the packets as they come through the interface filter, I was just wondering if there was some way to tell which packets from the interface may be from a wireless connection or not?
Since you are using an interface filter, then the packets you get from a specific interface are either all from a wireless connection, or none are. Perhaps I am missing the point of your question.
In my filter I am passed a struct ifnet and the mbuf. I see that in the struct ifnet it gives me the interface name, i.e. 'en', 'lo' and so on, and with this I was just wondering if there is some variable in the struct that might also tell me if it is wireless or not.
There is nothing in the name that will give you a hint, and all will identified as ethernet, at the "BSD network device" layer. There is probably a mechanism available to distinguish wireless devices from others, at the IOKit layer, but I don't know what it is (perhaps the archives will tell). There is provision for maintaining this info at the BSD/network layer (the if_data substructure of the ifnet structure), but I don't know that this is ever filled in, and in any case, this would be done by the driver, so I can't say you can count on it. Anyone else? Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- "Weaseling out of things is what separates us from the animals. Well, except the weasel." - Homer J Simpson -------- _______________________________________________ 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/csmith%40fortresste ch.com This email sent to csmith@fortresstech.com _______________________________________________ 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