Transmission feedback in monitor mode

Hi,

I'm looking for an example on how to use transmission feedback on a device operating in monitor mode.

I've already managed to write an userlevel software (using the click modular router) that injects packets over a monitor interface however if I use wireshark to sniff the traffic from that interface i see no tx feedback packets (albeit for example I can clearly see that there are some retransmissions).

Is there a patch for making mac80211 use the IEEE80211_RADIOTAP_TX_FLAGS?

Thanks
R.