Re: DTIM (Power Save Mode) w/ HostAP

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On Fri, 14 Mar 2003 15:26:19 -0800
Matt Peterson <[email protected]> wrote:

> I've emailed the usual BSD driver developers, many of which have crammed 
> schedules.  Anyone else available to fix this up in FreeBSD?

Well, I've attached a patch that make power saving work for the
NetBSD-current.  My understanding is that the FreeBSD-current
wireless drivers are substantially similar, so we could probably
get something working pretty easily.

I offer this patch without a whole lot of testing;  it appears to
work with Lucent and PRISM2 cards on NetBSD systems.  I had a discussion
with Matt off-line in which he suggested that several folks were
anxious to play with the patch, so I went ahead and posted it.  If people
try it out, I'd love to hear about any issues that come up.

There are still some issues to resolve:

* AID allocation is pretty clunky.  I iterate through all of the
  attached STAs to verify that a new AID is unique.  This is
  grossly inefficient and could really break down under a high
  load.  This should really be rewritten to use a bitmap.

* There is no limit on the number of packets that will be saved
  for a STA in power save mode.  We should certainly have some limit
  to prevent some sort of DoS attack.  the 802.11 spec requires us to 
  store packets for at least the listen interval specified when the 
  STA associates.  I don't think that we keep track of the listen
  interval right now.  We should probably reject association attempts
  with ridiculous listen intervals.

* AID allocation is flat out broken -- I noticed while preparing this
  message that after 2007 AIDs are handed out, I fail to reset the
  AID counter.  I figured it was better to get the patch out and fix
  that later.

Kevin
[email protected]
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--Multipart_Wed__19_Mar_2003_16:19:29_-0800_08161400--
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