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From: Johannes Berg <johannes@sipsolutions.net>
To: andy@warmcat.com
Cc: linux-wireless@vger.kernel.org, Michael Wu <flamingice@sourmilk.net>
Subject: Re: [PATCH 0/4] Try #5: Radiotap on Monitor Mode interfaces for rx  and tx
Date: Wed, 21 Mar 2007 19:46:49 +0100	[thread overview]
Message-ID: <1174502809.3944.36.camel@johannes.berg> (raw)
In-Reply-To: <20070320103955.600509703@warmcat.com>

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Hi,

Here are some more issues using monitor interfaces for management that
will need to be addressed before I'm convinced that doing injection on
monitor interfaces is viable.

If the driver does not support radiotap, ieee80211_rx_monitor needs to
expand the head for each packet. Currently, this is also true, but since
currently no non-management frames are sent down the management
interface, this is not an issue. If each data packet needs to be first
reallocated though, it quickly becomes a problem for low-power embedded
access points running hostapd.

Additionally, the overhead of tacking on radiotap headers to each
received frame is also rather high if you're only interested in
receiving the information for management frames.

johannes

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  parent reply	other threads:[~2007-03-22 10:04 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-20 10:39 [PATCH 0/4] Try #5: Radiotap on Monitor Mode interfaces for rx and tx andy
2007-03-20 10:39 ` [PATCH 1/4] mac80211: Coding style cleanups andy
2007-03-21 18:58   ` Johannes Berg
2007-03-29 11:17     ` Andy Green
2007-03-20 10:39 ` [PATCH 2/4] mac80211: Add radiotap support for Monitor mode RX andy
2007-03-21 18:51   ` Johannes Berg
2007-03-22 23:18     ` Michael Wu
2007-03-23 13:44       ` Johannes Berg
2007-03-20 10:39 ` [PATCH 3/4] mac80211: Monitor mode radiotap injection docs andy
2007-03-21 18:15   ` Johannes Berg
2007-03-29 11:18     ` Andy Green
2007-03-29 11:26       ` Johannes Berg
2007-03-20 10:39 ` [PATCH 4/4] mac80211: Monitor mode radiotap-based packet injection andy
2007-03-21 18:28   ` Johannes Berg
2007-03-29 11:14     ` Andy Green
2007-03-29 11:19       ` Johannes Berg
2007-03-29 11:33         ` Andy Green
2007-03-29 11:48           ` Johannes Berg
2007-03-21 18:10 ` [PATCH 0/4] Try #5: Radiotap on Monitor Mode interfaces for rx and tx Johannes Berg
2007-03-22 22:58   ` Michael Wu
2007-03-23 14:01     ` Johannes Berg
2007-03-23  8:57   ` Andy Green
2007-03-23 13:57     ` Johannes Berg
2007-03-21 18:46 ` Johannes Berg [this message]
2007-03-22 23:10   ` Michael Wu

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