net80211 and interface requests

[Bernhard Schmidt]

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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-- 
Bernhard