p54: more cryptographic accelerator fixes

If we let the firmware do the data encryption, we have to remove the ICV and
(M)MIC at the end of the frame before we can give it back to mac80211.
Or, these data frames have a few trailing bytes on cooked monitor interfaces.

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

diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index 61b01930d9aa08d82259f87fc3f7b0a2db5b1e04..34561e6e816be3dcefcf6f63caa709a9b9673b8e 100644 (file)
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -745,7 +745,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
                struct ieee80211_tx_info *info = IEEE80211_SKB_CB(entry);
                struct p54_hdr *entry_hdr;
                struct p54_tx_data *entry_data;
-               int pad = 0;
+               unsigned int pad = 0, frame_len;
 
                range = (void *)info->rate_driver_data;
                if (range->start_addr != addr) {
@@ -768,6 +768,7 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
                __skb_unlink(entry, &priv->tx_queue);
                spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 
+               frame_len = entry->len;
                entry_hdr = (struct p54_hdr *) entry->data;
                entry_data = (struct p54_tx_data *) entry_hdr->data;
                priv->tx_stats[entry_data->hw_queue].len--;
@@ -814,15 +815,28 @@ static void p54_rx_frame_sent(struct ieee80211_hw *dev, struct sk_buff *skb)
                info->status.ack_signal = p54_rssi_to_dbm(dev,
                                (int)payload->ack_rssi);
 
-               if (entry_data->key_type == P54_CRYPTO_TKIPMICHAEL) {
+               /* Undo all changes to the frame. */
+               switch (entry_data->key_type) {
+               case P54_CRYPTO_TKIPMICHAEL: {
                        u8 *iv = (u8 *)(entry_data->align + pad +
-                                       entry_data->crypt_offset);
+                                       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 */
+
+                       frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
+                       break;
+                       }
+               case P54_CRYPTO_AESCCMP:
+                       frame_len -= 8; /* remove CCMP_MIC */
+                       break;
+               case P54_CRYPTO_WEP:
+                       frame_len -= 4; /* remove WEP_ICV */
+                       break;
                }
+               skb_trim(entry, frame_len);
                skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
                ieee80211_tx_status_irqsafe(dev, entry);
                goto out;