unsigned int rt2x00crypto_tx_overhead(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_key_conf *key = tx_info->control.hw_key;
unsigned int overhead = 0;
if (!rt2x00_has_cap_hw_crypto(rt2x00dev) || !key)
return overhead;
/*
* Extend frame length to include IV/EIV/ICV/MMIC,
* note that these lengths should only be added when
* mac80211 does not generate it.
*/
overhead += key->icv_len;
if (!(key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
overhead += key->iv_len;
if (!(key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
if (key->cipher == WLAN_CIPHER_SUITE_TKIP)
overhead += 8;
}
return overhead;
}
void rt2x00crypto_create_tx_descriptor(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct txentry_desc *txdesc)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
if (!rt2x00_has_cap_hw_crypto(rt2x00dev) || !hw_key)
return;
__set_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags);
txdesc->cipher = rt2x00crypto_key_to_cipher(hw_key);
if (hw_key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
__set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags);
txdesc->key_idx = hw_key->hw_key_idx;
txdesc->iv_offset = txdesc->header_length;
txdesc->iv_len = hw_key->iv_len;
if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
__set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags);
if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
__set_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags);
}
int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
struct ieee80211_vif *vif, struct ieee80211_sta *sta,
struct ieee80211_key_conf *key)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
int (*set_key) (struct rt2x00_dev *rt2x00dev,
struct rt2x00lib_crypto *crypto,
struct ieee80211_key_conf *key);
struct rt2x00lib_crypto crypto;
static const u8 bcast_addr[ETH_ALEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
struct rt2x00_sta *sta_priv = NULL;
if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
return 0;
if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
return -EOPNOTSUPP;
/*
* To support IBSS RSN, don't program group keys in IBSS, the
* hardware will then not attempt to decrypt the frames.
*/
if (vif->type == NL80211_IFTYPE_ADHOC &&
!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
return -EOPNOTSUPP;
if (key->keylen > 32)
return -ENOSPC;
memset(&crypto, 0, sizeof(crypto));
crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
crypto.cipher = rt2x00crypto_key_to_cipher(key);
if (crypto.cipher == CIPHER_NONE)
return -EOPNOTSUPP;
if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
return -EOPNOTSUPP;
crypto.cmd = cmd;
if (sta) {
crypto.address = sta->addr;
sta_priv = sta_to_rt2x00_sta(sta);
crypto.wcid = sta_priv->wcid;
} else
crypto.address = bcast_addr;
if (crypto.cipher == CIPHER_TKIP)
memcpy_tkip(&crypto, &key->key[0], key->keylen);
else
memcpy(crypto.key, &key->key[0], key->keylen);
/*
* Each BSS has a maximum of 4 shared keys.
* Shared key index values:
* 0) BSS0 key0
* 1) BSS0 key1
* ...
* 4) BSS1 key0
* ...
* 8) BSS2 key0
* ...
* Both pairwise as shared key indeces are determined by
* driver. This is required because the hardware requires
* keys to be assigned in correct order (When key 1 is
* provided but key 0 is not, then the key is not found
* by the hardware during RX).
*/
if (cmd == SET_KEY)
key->hw_key_idx = 0;
if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
set_key = rt2x00dev->ops->lib->config_pairwise_key;
else
set_key = rt2x00dev->ops->lib->config_shared_key;
if (!set_key)
return -EOPNOTSUPP;
return set_key(rt2x00dev, &crypto, key);
}