kern/53187

[Bruce M Simpson]

The following reply was made to PR kern/53187; it has been noted by GNATS.

From: Bruce M Simpson <bms at spc.org>
To: freebsd-gnats-submit at FreeBSD.org
Cc:  
Subject: Re: kern/53187
Date: Wed, 11 Jun 2003 09:24:29 +0100

 Here are more of my notes from working through the problem:-
 
    - firmly established that old-style monitor-mode/procframe handling is
      gone from the driver. this is what breaks bsd-airtools.
    - tcpdump is able to sniff 802.11 headers though; but it does the
      following: pcap_set_datalink(p, DLT_IEEE802_11).
    - looks like enabling monitor mode does actually go through to hw still.
     - dstumbler is heavily dependent on the old monitor-mode behaviour 
       from 5.0-RELEASE. but it could be patched to do things in a way
       which is compatible with the new api changes.
     - looks like struct wi_rx_frame {} no longer used, but still defined.
     - the wi_frame is broadly equivalent to the wi_rx_frame struct
       abused by bsd-airtools.
     - one would need to define a different link layer, IEEE802_11_PRISM2,
       dummy mbuf with procfame, and bpf_mtap() that.
     - Conditionalise it for people who are worried about this support
       bloating up their packet input path.
     - Moving wi_rx_intr() processing into taskqs is probably a far distant
       future exercise right now anyway.
 
 I could potentially write the code to do the above. I would like review
 from sam@ and imp@ first before deciding how to proceed.
 
 BMS