From: Andy Green <andy@warmcat.com>
To: Ivo van Doorn <ivdoorn@gmail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: Question about packet injection
Date: Thu, 01 Mar 2007 17:14:23 +0000 [thread overview]
Message-ID: <45E709EF.6060200@warmcat.com> (raw)
In-Reply-To: <200703011622.17602.IvDoorn@gmail.com>
Ivo van Doorn wrote:
> On Thursday 01 March 2007 16:11, Andy Green wrote:
>> Hi folks -
>>
>> As suggested here I migrated my daemon to using a per-physical device
>> monitor mode interface it creates and destroys from usermode, together
>> with libpcap for filtering and receiving broadcasts and that seems to be
>> working okay. So that is half the battle to get the broadcast system
>> working with mac80211 out of the box without patches.
>>
>> However, if I inject a captured packet - with a PRISM header prepended -
>> down the Monitor mode interface using pcap_inject(), I see it appear on
>> the libpcap captured output okay, but it does not go out on the air AFAICT.
>>
>> Is this in fact the correct way to try to inject a packet with fine
>> control over its encryption and rate? If so is it expected to currently
>> work on iwlwifi 0.0.8 or rt2x00 (rt73usb) from CVS 2008-02-14?
>
> Note that rt73usb is currently broken, I know that RX isn't working
> because scanning fails. Chances are quite high that TX is failing too.
> I am still looking into that issue, but it might be the reason why
> packet injection is failing for you.
The 2007-02-14 rt73usb CVS works okay for RX, it does iwlist wlan0 scans
alright here anyway with the AP shown. I have had that version issuing
unencrypted broadcasts too by hacking the stack and the driver slightly.
Maybe it was some Valentines Day magic :-) But it doesn't associate
in a stable way with the AP using WPA on wpa_supplicant with the dscape
patch.
Anyway it seems the problem is one does not inject for TX on the Monitor
mode interface (/me goes away to grep and google what a Management mode
interface does, thanks Johannes)
-Andy
prev parent reply other threads:[~2007-03-01 17:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-27 11:48 [RFC] Penumbra - Enabling unencrypted broadcasts alongside normal traffic Andy Green
2007-02-27 12:59 ` Johannes Berg
2007-02-27 13:30 ` Andy Green
2007-02-27 16:47 ` Jouni Malinen
2007-02-27 20:42 ` Andy Green
2007-03-01 15:11 ` Question about packet injection Andy Green
2007-03-01 15:21 ` Johannes Berg
2007-03-01 15:22 ` Ivo van Doorn
2007-03-01 17:14 ` Andy Green [this message]
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