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mac80211: Fix Extended Key ID auto activation 

Only enable Extended Key ID support for drivers which are not supporting
crypto offload and also do not support A-MPDU.

While any driver using SW crypto from mac80211 is generally able to also
support Extended Key ID these drivers are likely to mix keyIDs in
AMPDUs when rekeying.

According to IEEE 802.11-2016 "9.7.3 A-MPDU contents" this is not
allowed.

Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
[reword comment a bit, move ! into logic expression]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexander Wetzel 2019-04-22 23:34:11 +02:00 committed by Johannes Berg
parent 5809a5d54b
commit 622fce8128
1 changed files with 5 additions and 1 deletions
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6
net/mac80211/main.c
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@ -1051,7 +1051,11 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
}
}
if (!local->ops->set_key ||
/* Enable Extended Key IDs when driver allowed it, or when it
* supports neither HW crypto nor A-MPDUs
*/
if ((!local->ops->set_key &&
!ieee80211_hw_check(hw, AMPDU_AGGREGATION)) ||
ieee80211_hw_check(&local->hw, EXT_KEY_ID_NATIVE))
wiphy_ext_feature_set(local->hw.wiphy,
NL80211_EXT_FEATURE_EXT_KEY_ID);