Date: Fri, 13 Apr 2001 03:13:08 -0700 From: Julian Elischer <julian@elischer.org> To: Duncan Barclay <dmlb@dmlb.org> Cc: freebsd-arch@freebsd.org Subject: Re: Use of if_ef for 802.11 interfaces? Message-ID: <3AD6D134.180707A3@elischer.org> References: <XFMail.010412235102.dmlb@computer.my.domain>
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Duncan Barclay wrote:
>
> Hi
>
> Currently, I'm updating if_ray to work with newer cards and access points. In
> doing this I have to have code to cope with hacking the ethernet header
> around. For example on transmit I need:
>
> o build 802.11 header
> (add source, destination and BSS or AP address and a few
> flags)
>
> o then encapsulate, or
> (802.11 header pre-pended to complete Ethernet II packet)
>
> o translate
> (remove Ethernet header, replace with 802.11 header and
> RFC1042 LLC/SNAP)
>
> Most (awi, if_wi) other 802.11 drivers need to do something similar. In
> digging around I re-discovered if_ef and wondered if this is a good
> place to add this functionality?
I am looking at building a set of Netgraph nodes for mangling 802.11
packets. I will possibly be doing WEP and AP related functions on netgraph
nodes. What code do you already have?
I see Andre has already spoken up.
We would be working on this.
>
> A couple of practical points arise for outgoing packets revolving
> around the type of 802.11 network in use (infrastructure or adhoc)
> that would involve if_ef knowing what mode the interface is in and the
> BSSID. We have some common support for this in the form of the recent
> (uncommitted) patches to ifconfig PR25577.
>
> In summary,
> o is if_ef the best place for this?
> o if not, would an 80211_input() be useful?
> o if not, I'll copy the code from awi.c
>
> Duncan
>
> PS.
>
> I have also noticed that most of the 802.11 drivers that divine whether
> RFC1042 is being used on received packets can potentially get things a
> bit wrong by incompletely parsing the .11 header. This can be trivially
> fixed though.
>
> ---
> ________________________________________________________________________
> Duncan Barclay | God smiles upon the little children,
> dmlb@dmlb.org | the alcoholics, and the permanently stoned.
> dmlb@freebsd.org| Steven King
>
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