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>

6 files changed, 29 insertions, 46 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 8f0852d058e..52c7eae08d4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -2389,6 +2389,7 @@ static int iwl4965_set_decrypted_flag(struct iwl_priv *priv,
                     RX_RES_STATUS_BAD_KEY_TTAK)
                         break;
 
+        case RX_RES_STATUS_SEC_TYPE_WEP:
                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
                     RX_RES_STATUS_BAD_ICV_MIC) {
                         /* bad ICV, the packet is destroyed since the
@@ -2396,7 +2397,6 @@ static int iwl4965_set_decrypted_flag(struct iwl_priv *priv,
                         IWL_DEBUG_RX("Packet destroyed\n");
                         return -1;
                 }
-        case RX_RES_STATUS_SEC_TYPE_WEP:
         case RX_RES_STATUS_SEC_TYPE_CCMP:
                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
                     RX_RES_STATUS_DECRYPT_OK) {
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 7a54682a3d8..305491ff9be 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -442,7 +442,6 @@ struct iwl_hw_key {
         enum ieee80211_key_alg alg;
         int keylen;
         u8 keyidx;
-        struct ieee80211_key_conf *conf;
         u8 key[32];
 };
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index c8e468fb3ca..99ee1e14e29 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;
         }
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.h b/drivers/net/wireless/iwlwifi/iwl-sta.h
index ee256430708..b643546961f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.h
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.h
@@ -29,6 +29,9 @@
 #ifndef __iwl_sta_h__
 #define __iwl_sta_h__
 
+#define HW_KEY_DYNAMIC 0
+#define HW_KEY_DEFAULT 1
+
 int iwl_get_free_ucode_key_index(struct iwl_priv *priv);
 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty);
 int iwl_remove_default_wep_key(struct iwl_priv *priv,
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index a37ced58c66..f32cddabdf6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -639,16 +639,12 @@ static void iwl_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
                                       struct sk_buff *skb_frag,
                                       int sta_id)
 {
-        struct iwl_hw_key *keyinfo = &priv->stations[sta_id].keyinfo;
-        struct iwl_wep_key *wepkey;
-        int keyidx = 0;
+        struct ieee80211_key_conf *keyconf = ctl->hw_key;
 
-        BUG_ON(ctl->hw_key->hw_key_idx > 3);
-
-        switch (keyinfo->alg) {
+        switch (keyconf->alg) {
         case ALG_CCMP:
                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
-                memcpy(tx_cmd->key, keyinfo->key, keyinfo->keylen);
+                memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
                 if (ctl->flags & IEEE80211_TXCTL_AMPDU)
                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
                 IWL_DEBUG_TX("tx_cmd with aes hwcrypto\n");
@@ -656,39 +652,26 @@ static void iwl_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
 
         case ALG_TKIP:
                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
-                ieee80211_get_tkip_key(keyinfo->conf, skb_frag,
+                ieee80211_get_tkip_key(keyconf, skb_frag,
                         IEEE80211_TKIP_P2_KEY, tx_cmd->key);
                 IWL_DEBUG_TX("tx_cmd with tkip hwcrypto\n");
                 break;
 
         case ALG_WEP:
-                wepkey = &priv->wep_keys[ctl->hw_key->hw_key_idx];
-                tx_cmd->sec_ctl = 0;
-                if (priv->default_wep_key) {
-                        /* the WEP key was sent as static */
-                        keyidx = ctl->hw_key->hw_key_idx;
-                        memcpy(&tx_cmd->key[3], wepkey->key,
-                                                        wepkey->key_size);
-                        if (wepkey->key_size == WEP_KEY_LEN_128)
-                                tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
-                } else {
-                        /* the WEP key was sent as dynamic */
-                        keyidx = keyinfo->keyidx;
-                        memcpy(&tx_cmd->key[3], keyinfo->key,
-                                                        keyinfo->keylen);
-                        if (keyinfo->keylen == WEP_KEY_LEN_128)
-                                tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
-                }
-
                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
-                        (keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
+                        (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
+
+                if (keyconf->keylen == WEP_KEY_LEN_128)
+                        tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
+
+                memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
 
                 IWL_DEBUG_TX("Configuring packet for WEP encryption "
-                             "with key %d\n", keyidx);
+                             "with key %d\n", keyconf->keyidx);
                 break;
 
         default:
-                printk(KERN_ERR "Unknown encode alg %d\n", keyinfo->alg);
+                printk(KERN_ERR "Unknown encode alg %d\n", keyconf->alg);
                 break;
         }
 }
diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c
index a532a9e576d..40616dbd26f 100644
--- a/drivers/net/wireless/iwlwifi/iwl4965-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c
@@ -4951,7 +4951,8 @@ static int iwl4965_mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                 if (cmd == SET_KEY)
                         is_default_wep_key = !priv->key_mapping_key;
                 else
-                        is_default_wep_key = priv->default_wep_key;
+                        is_default_wep_key =
+                                        (key->hw_key_idx == HW_KEY_DEFAULT);
         }
 
         switch (cmd) {