static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
struct ieee80211_vif *vif, struct ieee80211_sta *sta,
struct ieee80211_key_conf *key)
{
struct p54_common *priv = dev->priv;
int slot, ret = 0;
u8 algo = 0;
u8 *addr = NULL;
if (modparam_nohwcrypt)
return -EOPNOTSUPP;
if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
/*
* Unfortunately most/all firmwares are trying to decrypt
* incoming management frames if a suitable key can be found.
* However, in doing so the data in these frames gets
* corrupted. So, we can't have firmware supported crypto
* offload in this case.
*/
return -EOPNOTSUPP;
}
mutex_lock(&priv->conf_mutex);
if (cmd == SET_KEY) {
switch (key->cipher) {
case WLAN_CIPHER_SUITE_TKIP:
if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
BR_DESC_PRIV_CAP_TKIP))) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_TKIPMICHAEL;
break;
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_WEP;
break;
case WLAN_CIPHER_SUITE_CCMP:
if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_AESCCMP;
break;
default:
ret = -EOPNOTSUPP;
goto out_unlock;
}
slot = bitmap_find_free_region(priv->used_rxkeys,
priv->rx_keycache_size, 0);
if (slot < 0) {
/*
* The device supports the chosen algorithm, but the
* firmware does not provide enough key slots to store
* all of them.
* But encryption offload for outgoing frames is always
* possible, so we just pretend that the upload was
* successful and do the decryption in software.
*/
/* mark the key as invalid. */
key->hw_key_idx = 0xff;
goto out_unlock;
}
} else {
slot = key->hw_key_idx;
if (slot == 0xff) {
/* This key was not uploaded into the rx key cache. */
goto out_unlock;
}
bitmap_release_region(priv->used_rxkeys, slot, 0);
algo = 0;
}
if (sta)
addr = sta->addr;
ret = p54_upload_key(priv, algo, slot, key->keyidx,
key->keylen, addr, key->key);
if (ret) {
bitmap_release_region(priv->used_rxkeys, slot, 0);
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->hw_key_idx = slot;
out_unlock:
mutex_unlock(&priv->conf_mutex);
return ret;
}
static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
struct ieee80211_vif *vif, struct ieee80211_sta *sta,
struct ieee80211_key_conf *key)
{
struct p54_common *priv = dev->priv;
int slot, ret = 0;
u8 algo = 0;
u8 *addr = NULL;
if (modparam_nohwcrypt)
return -EOPNOTSUPP;
mutex_lock(&priv->conf_mutex);
if (cmd == SET_KEY) {
switch (key->alg) {
case ALG_TKIP:
if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
BR_DESC_PRIV_CAP_TKIP))) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_TKIPMICHAEL;
break;
case ALG_WEP:
if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_WEP;
break;
case ALG_CCMP:
if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
algo = P54_CRYPTO_AESCCMP;
break;
default:
ret = -EOPNOTSUPP;
goto out_unlock;
}
slot = bitmap_find_free_region(priv->used_rxkeys,
priv->rx_keycache_size, 0);
if (slot < 0) {
/*
* The device supports the choosen algorithm, but the
* firmware does not provide enough key slots to store
* all of them.
* But encryption offload for outgoing frames is always
* possible, so we just pretend that the upload was
* successful and do the decryption in software.
*/
/* mark the key as invalid. */
key->hw_key_idx = 0xff;
goto out_unlock;
}
} else {
slot = key->hw_key_idx;
if (slot == 0xff) {
/* This key was not uploaded into the rx key cache. */
goto out_unlock;
}
bitmap_release_region(priv->used_rxkeys, slot, 0);
algo = 0;
}
if (sta)
addr = sta->addr;
ret = p54_upload_key(priv, algo, slot, key->keyidx,
key->keylen, addr, key->key);
if (ret) {
bitmap_release_region(priv->used_rxkeys, slot, 0);
ret = -EOPNOTSUPP;
goto out_unlock;
}
key->hw_key_idx = slot;
out_unlock:
mutex_unlock(&priv->conf_mutex);
return ret;
}
