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IEEE80211 Acknowledgement

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Hi,

I'm trying to catch Acknowlegement frames in the mac80211, but I don't managed to. Thus I'm wondering if they follow another path than the frames that aren't control ones?
First I grab the header from the skb:
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

then I run tests on the frame control. I can see frames like probe request or association request (ieee80211_is_probe_req, ieee80211_is_assoc_req,...) but there are never any ack ones. I did this in functions __ieee80211_rx and ieee80211_rx_irqsafe in rx.c

I'm doing this with a ralink chip (rt73usb) on the wireless-testing kernel.

Alexandre Becholey
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