net80211 and interface requests
kungfujesus06 at gmail.com
Thu Mar 31 12:20:43 UTC 2011
On Thu, Mar 31, 2011 at 09:02:45AM +0200, Bernhard Schmidt wrote:
> On Wednesday, March 30, 2011 23:17:53 Adam Stylinski wrote:
> > Hello,
> > This list has helped me before so I'll email again with the hopes that
> > somebody has an answer. All is working well with my project, however for
> > the life of me I cannot get the interface to inject the raw frames faster
> > than 11mbps. I'm following the example given in
> > /usr/src/tools/tools/net80211/wlaninject.c, and manually specifying
> > parameters such as ucastrate, mcastrate, and mgmtrate within ifconfig. I'm
> > putting the card into pureg mode, and yet I still can't inject any faster.
> > I've even gone so far as to specify an ieee802211_txparam struct giving
> > values of 255 both mcast and ucast rates within the struct (and of course
> > anding them by 0xff). I then used the ioctl call to set the flags within
> > the interface request. Any help would be greatly appreciated.
> You've set the ibp_rate0 parameter right? This one is in half-mbps, so
> a value of 108 should give you 54m. The only thing I can think of right
> now is that the device (or channel) is actually configured for 11b not
> 11g mode. Can we rule that out? Which device are you using?
> > I am doing nanosleeps in between transmissions as if I don't the bpf clone
> > can't inject due to the buffer being too full. There's probably a better
> > way of doing this, but I doubt the nanosleeps are the issue (afterall, I get
> > almost exactly 11mbps). I should probably note I'm not doing any ACKs, this
> > is pure transmits.
> > If anybody cares enough to look at my unpolished code to get a better idea,
> > look here:
> > http://projhinternet.svn.sourceforge.net/
> > The idea is to allow unidirectional traffic so that with an FCC amateur
> > license (yes I know I'm not currently broadcasting the call sign as of yet)
> > you can broadcast unencrypted transmissions for miles (with a linear
> > amplifier spec'd to 2.4ghz). With the license FCC part15 no longer applies
> > and you can operate just like in any other amateur band.
> > _______________________________________________
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I'm using an atheros AR2413 chipset, running in pure g mode, with also the card put into "mode 11g" and ucast, mcast, and mgmt rates set to 54. I think the parameter for ibp_rate0 is just for setting it in the header (but I could be wrong). Regardless I am doing this, let me give you the exact source files I'm doing this in.
Line 38 in this file:
And the setup_if function in this:
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