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[MAC80211]: improve key selection comment
When I changed the code there I forgot to mention what happens with multicast frames in a regular BSS and keep wondering myself if the code is correct. Add appropriate comments. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -327,8 +327,15 @@ ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
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* frames can also use key indizes like GTKs. Hence, if we don't
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* have a PTK/STK we check the key index for a WEP key.
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*
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* Note that in a regular BSS, multicast frames are sent by the
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* AP only, associated stations unicast the frame to the AP first
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* which then multicasts it on their behalf.
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*
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* There is also a slight problem in IBSS mode: GTKs are negotiated
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* with each station, that is something we don't currently handle.
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* The spec seems to expect that one negotiates the same key with
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* every station but there's no such requirement; VLANs could be
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* possible.
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*/
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if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
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