Commit ccc038ab authored by Emmanuel Grumbach's avatar Emmanuel Grumbach Committed by John W. Linville
Browse files

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: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent a9841013
......@@ -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) {
......
......@@ -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];
};
......
......@@ -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;
}
......
......@@ -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,
......
......@@ -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;
}
}
......
......@@ -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) {
......
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