iwlwifi: clean up and bug fix for security

This patch cleans up code in security.

1) uses the new pointer to ieee80211_key_conf passed with the tx_control.
2) resolves bug reported by Mirco Tischler (sends ADD_STA in ASYNC mode)
3) resolves bug reported by Volker Braun regarding dynamic WEP
4) drops a WEP packet which has been garbaged by firmware. This can
happen upon rekeying.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 14 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index c8e468fb3caa..99ee1e14e29e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -324,7 +324,7 @@ int iwl_set_default_wep_key(struct iwl_priv *priv,
         unsigned long flags;
 
         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
-        keyconf->hw_key_idx = keyconf->keyidx;
+        keyconf->hw_key_idx = HW_KEY_DEFAULT;
         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
@@ -354,7 +354,6 @@ static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
         int ret;
 
         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
-        keyconf->hw_key_idx = keyconf->keyidx;
 
         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
@@ -411,7 +410,6 @@ static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
                 key_flags |= STA_KEY_MULTICAST_MSK;
 
         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
-        keyconf->hw_key_idx = keyconf->keyidx;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
@@ -449,12 +447,10 @@ static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 
         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
-        keyconf->hw_key_idx = keyconf->keyidx;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
 
         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
-        priv->stations[sta_id].keyinfo.conf = keyconf;
         priv->stations[sta_id].keyinfo.keylen = 16;
 
         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
@@ -483,7 +479,7 @@ int iwl_remove_dynamic_key(struct iwl_priv *priv,
         u16 key_flags;
         u8 keyidx;
 
-        priv->key_mapping_key = 0;
+        priv->key_mapping_key--;
 
         spin_lock_irqsave(&priv->sta_lock, flags);
         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
@@ -514,31 +510,32 @@ int iwl_remove_dynamic_key(struct iwl_priv *priv,
         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 
         IWL_DEBUG_INFO("hwcrypto: clear ucode station key info\n");
-        ret =  iwl_send_add_sta(priv, &priv->stations[sta_id].sta, 0);
+        ret =  iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
         spin_unlock_irqrestore(&priv->sta_lock, flags);
         return ret;
 }
 EXPORT_SYMBOL(iwl_remove_dynamic_key);
 
 int iwl_set_dynamic_key(struct iwl_priv *priv,
-                                struct ieee80211_key_conf *key, u8 sta_id)
+                                struct ieee80211_key_conf *keyconf, u8 sta_id)
 {
         int ret;
 
-        priv->key_mapping_key = 1;
+        priv->key_mapping_key++;
+        keyconf->hw_key_idx = HW_KEY_DYNAMIC;
 
-        switch (key->alg) {
+        switch (keyconf->alg) {
         case ALG_CCMP:
-                ret = iwl_set_ccmp_dynamic_key_info(priv, key, sta_id);
+                ret = iwl_set_ccmp_dynamic_key_info(priv, keyconf, sta_id);
                 break;
         case ALG_TKIP:
-                ret = iwl_set_tkip_dynamic_key_info(priv, key, sta_id);
+                ret = iwl_set_tkip_dynamic_key_info(priv, keyconf, sta_id);
                 break;
         case ALG_WEP:
-                ret = iwl_set_wep_dynamic_key_info(priv, key, sta_id);
+                ret = iwl_set_wep_dynamic_key_info(priv, keyconf, sta_id);
                 break;
         default:
-                IWL_ERROR("Unknown alg: %s alg = %d\n", __func__, key->alg);
+                IWL_ERROR("Unknown alg: %s alg = %d\n", __func__, keyconf->alg);
                 ret = -EINVAL;
         }