[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>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 969be3adda7a..75a1e204b9b6 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -327,8 +327,15 @@ ieee80211_rx_h_load_key(struct ieee80211_txrx_data *rx)
          * frames can also use key indizes like GTKs. Hence, if we don't
          * have a PTK/STK we check the key index for a WEP key.
          *
+         * Note that in a regular BSS, multicast frames are sent by the
+         * AP only, associated stations unicast the frame to the AP first
+         * which then multicasts it on their behalf.
+         *
          * There is also a slight problem in IBSS mode: GTKs are negotiated
          * with each station, that is something we don't currently handle.
+         * The spec seems to expect that one negotiates the same key with
+         * every station but there's no such requirement; VLANs could be
+         * possible.
          */
 
         if (!(rx->fc & IEEE80211_FCTL_PROTECTED))