p54: crypto offload fixes

This patch fixes two small flaws:
 - restore the original TKIP IV if we altered it.
 - reserve & initialize ICV with zeros.
   This is actually only necessary for some obsolete p54usb firmwares.
   But we don't know yet, if all devices are compatible with the new revisions.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 06c64744df27..37294a657f8b 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -809,6 +809,16 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
                         info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
                 info->status.ack_signal = p54_rssi_to_dbm(dev,
                                 (int)payload->ack_rssi);
+
+                if (entry_data->key_type == P54_CRYPTO_TKIPMICHAEL) {
+                        u8 *iv = (u8 *)(entry_data->align + pad +
+                                        entry_data->crypt_offset);
+
+                        /* Restore the original TKIP IV. */
+                        iv[2] = iv[0];
+                        iv[0] = iv[1];
+                        iv[1] = (iv[0] | 0x20) & 0x7f;  /* WEPSeed - 8.3.2.2 */
+                }
                 skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
                 ieee80211_tx_status_irqsafe(dev, entry);
                 goto out;
@@ -1394,7 +1404,6 @@ static int p54_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
         hdr->tries = ridx;
         txhdr->rts_rate_idx = 0;
         if (info->control.hw_key) {
-                crypt_offset += info->control.hw_key->iv_len;
                 txhdr->key_type = p54_convert_algo(info->control.hw_key->alg);
                 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
                 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
@@ -1408,6 +1417,8 @@ static int p54_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
                 }
                 /* reserve some space for ICV */
                 len += info->control.hw_key->icv_len;
+                memset(skb_put(skb, info->control.hw_key->icv_len), 0,
+                       info->control.hw_key->icv_len);
         } else {
                 txhdr->key_type = 0;
                 txhdr->key_len = 0;