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mac80211: add atomic uploaded keys iterator

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add ieee80211_iter_keys_rcu() to iterate over uploaded
keys in atomic context (when rcu is locked)

The station removal code removes the keys only after
calling synchronize_net(), so it's not safe to iterate
the keys at this point (and postponing the actual key
deletion with call_rcu() might result in some
badly-ordered ops calls).

Add a flag to indicate a station is being removed,
and skip the configured keys if it's set.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Eliad Peller
2015-11-17 10:24:37 +02:00
committed by Johannes Berg
parent 0ead2510f8
commit ef044763a3
4 changed files with 79 additions and 4 deletions
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24
include/net/mac80211.h
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@@ -4917,6 +4917,30 @@ void ieee80211_iter_keys(struct ieee80211_hw *hw,
void *data),
void *iter_data);
/**
* ieee80211_iter_keys_rcu - iterate keys programmed into the device
* @hw: pointer obtained from ieee80211_alloc_hw()
* @vif: virtual interface to iterate, may be %NULL for all
* @iter: iterator function that will be called for each key
* @iter_data: custom data to pass to the iterator function
*
* This function can be used to iterate all the keys known to
* mac80211, even those that weren't previously programmed into
* the device. Note that due to locking reasons, keys of station
* in removal process will be skipped.
*
* This function requires being called in an RCU critical section,
* and thus iter must be atomic.
*/
void ieee80211_iter_keys_rcu(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
void (*iter)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
struct ieee80211_key_conf *key,
void *data),
void *iter_data);
/**
* ieee80211_iter_chan_contexts_atomic - iterate channel contexts
* @hw: pointre obtained from ieee80211_alloc_hw().