mac80211: pass scratch buffer directly, remove additional pointers
Recalculate the offset pointers in the ccmp calculations rather than in the callers. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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c34498b9e6
Коммит
feccb46694
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@ -53,15 +53,17 @@ static inline void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *b_0, u8 *aad,
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void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
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u8 *b_0, u8 *aad, u8 *data, size_t data_len,
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u8 *data, size_t data_len,
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u8 *cdata, u8 *mic)
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{
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int i, j, last_len, num_blocks;
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u8 *pos, *cpos, *b, *s_0, *e;
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u8 *pos, *cpos, *b, *s_0, *e, *b_0, *aad;
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b = scratch;
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s_0 = scratch + AES_BLOCK_LEN;
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e = scratch + 2 * AES_BLOCK_LEN;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
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last_len = data_len % AES_BLOCK_LEN;
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@ -92,15 +94,16 @@ void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
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int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
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u8 *b_0, u8 *aad, u8 *cdata, size_t data_len,
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u8 *mic, u8 *data)
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u8 *cdata, size_t data_len, u8 *mic, u8 *data)
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{
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int i, j, last_len, num_blocks;
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u8 *pos, *cpos, *b, *s_0, *a;
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u8 *pos, *cpos, *b, *s_0, *a, *b_0, *aad;
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b = scratch;
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s_0 = scratch + AES_BLOCK_LEN;
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a = scratch + 2 * AES_BLOCK_LEN;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);
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last_len = data_len % AES_BLOCK_LEN;
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@ -16,10 +16,10 @@
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struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]);
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void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,
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u8 *b_0, u8 *aad, u8 *data, size_t data_len,
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u8 *data, size_t data_len,
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u8 *cdata, u8 *mic);
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int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,
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u8 *b_0, u8 *aad, u8 *cdata, size_t data_len,
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u8 *cdata, size_t data_len,
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u8 *mic, u8 *data);
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void ieee80211_aes_key_free(struct crypto_cipher *tfm);
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@ -274,16 +274,20 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
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}
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static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
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static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
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int encrypted)
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{
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__le16 mask_fc;
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int a4_included;
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u8 qos_tid;
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u8 *b_0, *aad;
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u16 data_len, len_a;
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unsigned int hdrlen;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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/*
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* Mask FC: zero subtype b4 b5 b6
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* Retry, PwrMgt, MoreData; set Protected
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@ -367,7 +371,7 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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struct ieee80211_key *key = tx->key;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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int hdrlen, len, tail;
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u8 *pos, *pn, *b_0, *aad, *scratch;
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u8 *pos, *pn;
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int i;
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info->control.icv_len = CCMP_MIC_LEN;
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@ -381,10 +385,6 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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return 0;
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}
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scratch = key->u.ccmp.tx_crypto_buf;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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len = skb->len - hdrlen;
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@ -420,8 +420,8 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
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}
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pos += CCMP_HDR_LEN;
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ccmp_special_blocks(skb, pn, b_0, aad, 0);
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ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
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ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
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ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
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pos, skb_put(skb, CCMP_MIC_LEN));
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return 0;
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@ -483,16 +483,10 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
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if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
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/* hardware didn't decrypt/verify MIC */
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u8 *scratch, *b_0, *aad;
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scratch = key->u.ccmp.rx_crypto_buf;
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b_0 = scratch + 3 * AES_BLOCK_LEN;
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aad = scratch + 4 * AES_BLOCK_LEN;
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ccmp_special_blocks(skb, pn, b_0, aad, 1);
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ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
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if (ieee80211_aes_ccm_decrypt(
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key->u.ccmp.tfm, scratch, b_0, aad,
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key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
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skb->data + hdrlen + CCMP_HDR_LEN, data_len,
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skb->data + skb->len - CCMP_MIC_LEN,
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skb->data + hdrlen + CCMP_HDR_LEN)) {
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