+++ /dev/null
-/*
- Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
- <http://rt2x00.serialmonkey.com>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- Module: rt2x00lib
- Abstract: rt2x00 crypto specific routines.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include "rt2x00.h"
-#include "rt2x00lib.h"
-
-enum cipher rt2x00crypto_key_to_cipher(struct ieee80211_key_conf *key)
-{
- switch (key->cipher) {
- case WLAN_CIPHER_SUITE_WEP40:
- return CIPHER_WEP64;
- case WLAN_CIPHER_SUITE_WEP104:
- return CIPHER_WEP128;
- case WLAN_CIPHER_SUITE_TKIP:
- return CIPHER_TKIP;
- case WLAN_CIPHER_SUITE_CCMP:
- return CIPHER_AES;
- default:
- return CIPHER_NONE;
- }
-}
-
-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);
-}
-
-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_tx_copy_iv(struct sk_buff *skb, struct txentry_desc *txdesc)
-{
- struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
-
- if (unlikely(!txdesc->iv_len))
- return;
-
- /* Copy IV/EIV data */
- memcpy(skbdesc->iv, skb->data + txdesc->iv_offset, txdesc->iv_len);
-}
-
-void rt2x00crypto_tx_remove_iv(struct sk_buff *skb, struct txentry_desc *txdesc)
-{
- struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
-
- if (unlikely(!txdesc->iv_len))
- return;
-
- /* Copy IV/EIV data */
- memcpy(skbdesc->iv, skb->data + txdesc->iv_offset, txdesc->iv_len);
-
- /* Move ieee80211 header */
- memmove(skb->data + txdesc->iv_len, skb->data, txdesc->iv_offset);
-
- /* Pull buffer to correct size */
- skb_pull(skb, txdesc->iv_len);
- txdesc->length -= txdesc->iv_len;
-
- /* IV/EIV data has officially been stripped */
- skbdesc->flags |= SKBDESC_IV_STRIPPED;
-}
-
-void rt2x00crypto_tx_insert_iv(struct sk_buff *skb, unsigned int header_length)
-{
- struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
- const unsigned int iv_len =
- ((!!(skbdesc->iv[0])) * 4) + ((!!(skbdesc->iv[1])) * 4);
-
- if (!(skbdesc->flags & SKBDESC_IV_STRIPPED))
- return;
-
- skb_push(skb, iv_len);
-
- /* Move ieee80211 header */
- memmove(skb->data, skb->data + iv_len, header_length);
-
- /* Copy IV/EIV data */
- memcpy(skb->data + header_length, skbdesc->iv, iv_len);
-
- /* IV/EIV data has returned into the frame */
- skbdesc->flags &= ~SKBDESC_IV_STRIPPED;
-}
-
-void rt2x00crypto_rx_insert_iv(struct sk_buff *skb,
- unsigned int header_length,
- struct rxdone_entry_desc *rxdesc)
-{
- unsigned int payload_len = rxdesc->size - header_length;
- unsigned int align = ALIGN_SIZE(skb, header_length);
- unsigned int iv_len;
- unsigned int icv_len;
- unsigned int transfer = 0;
-
- /*
- * WEP64/WEP128: Provides IV & ICV
- * TKIP: Provides IV/EIV & ICV
- * AES: Provies IV/EIV & ICV
- */
- switch (rxdesc->cipher) {
- case CIPHER_WEP64:
- case CIPHER_WEP128:
- iv_len = 4;
- icv_len = 4;
- break;
- case CIPHER_TKIP:
- iv_len = 8;
- icv_len = 4;
- break;
- case CIPHER_AES:
- iv_len = 8;
- icv_len = 8;
- break;
- default:
- /* Unsupport type */
- return;
- }
-
- /*
- * Make room for new data. There are 2 possibilities
- * either the alignment is already present between
- * the 802.11 header and payload. In that case we
- * we have to move the header less then the iv_len
- * since we can use the already available l2pad bytes
- * for the iv data.
- * When the alignment must be added manually we must
- * move the header more then iv_len since we must
- * make room for the payload move as well.
- */
- if (rxdesc->dev_flags & RXDONE_L2PAD) {
- skb_push(skb, iv_len - align);
- skb_put(skb, icv_len);
-
- /* Move ieee80211 header */
- memmove(skb->data + transfer,
- skb->data + transfer + (iv_len - align),
- header_length);
- transfer += header_length;
- } else {
- skb_push(skb, iv_len + align);
- if (align < icv_len)
- skb_put(skb, icv_len - align);
- else if (align > icv_len)
- skb_trim(skb, rxdesc->size + iv_len + icv_len);
-
- /* Move ieee80211 header */
- memmove(skb->data + transfer,
- skb->data + transfer + iv_len + align,
- header_length);
- transfer += header_length;
- }
-
- /* Copy IV/EIV data */
- memcpy(skb->data + transfer, rxdesc->iv, iv_len);
- transfer += iv_len;
-
- /*
- * Move payload for alignment purposes. Note that
- * this is only needed when no l2 padding is present.
- */
- if (!(rxdesc->dev_flags & RXDONE_L2PAD)) {
- memmove(skb->data + transfer,
- skb->data + transfer + align,
- payload_len);
- }
-
- /*
- * NOTE: Always count the payload as transferred,
- * even when alignment was set to zero. This is required
- * for determining the correct offset for the ICV data.
- */
- transfer += payload_len;
-
- /*
- * Copy ICV data
- * AES appends 8 bytes, we can't fill the upper
- * 4 bytes, but mac80211 doesn't care about what
- * we provide here anyway and strips it immediately.
- */
- memcpy(skb->data + transfer, &rxdesc->icv, 4);
- transfer += icv_len;
-
- /* IV/EIV/ICV has been inserted into frame */
- rxdesc->size = transfer;
- rxdesc->flags &= ~RX_FLAG_IV_STRIPPED;
-}
projects / cascardo / linux.git / blobdiff