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Commit feccb466 authored by Harvey Harrison's avatar Harvey Harrison Committed by John W. Linville
Browse files

mac80211: pass scratch buffer directly, remove additional pointers 



Recalculate the offset pointers in the ccmp calculations rather than
in the callers.

Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent c34498b9

net/mac80211/aes_ccm.c

+8 −5
Original line number Diff line number Diff line
@@ -53,15 +53,17 @@ static inline void aes_ccm_prepare(struct crypto_cipher *tfm, u8 *b_0, u8 *aad, 




void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,

			       u8 *b_0, u8 *aad, u8 *data, size_t data_len,

			       u8 *data, size_t data_len,

			       u8 *cdata, u8 *mic)

{

	int i, j, last_len, num_blocks;

	u8 *pos, *cpos, *b, *s_0, *e;

	u8 *pos, *cpos, *b, *s_0, *e, *b_0, *aad;



	b = scratch;

	s_0 = scratch + AES_BLOCK_LEN;

	e = scratch + 2 * AES_BLOCK_LEN;

	b_0 = scratch + 3 * AES_BLOCK_LEN;

	aad = scratch + 4 * AES_BLOCK_LEN;



	num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);

	last_len = data_len % AES_BLOCK_LEN;
@@ -92,15 +94,16 @@ void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch, 




int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,

			      u8 *b_0, u8 *aad, u8 *cdata, size_t data_len,

			      u8 *mic, u8 *data)

			      u8 *cdata, size_t data_len, u8 *mic, u8 *data)

{

	int i, j, last_len, num_blocks;

	u8 *pos, *cpos, *b, *s_0, *a;

	u8 *pos, *cpos, *b, *s_0, *a, *b_0, *aad;



	b = scratch;

	s_0 = scratch + AES_BLOCK_LEN;

	a = scratch + 2 * AES_BLOCK_LEN;

	b_0 = scratch + 3 * AES_BLOCK_LEN;

	aad = scratch + 4 * AES_BLOCK_LEN;



	num_blocks = DIV_ROUND_UP(data_len, AES_BLOCK_LEN);

	last_len = data_len % AES_BLOCK_LEN;

net/mac80211/aes_ccm.h

+2 −2
Original line number Diff line number Diff line
@@ -16,10 +16,10 @@ 


struct crypto_cipher *ieee80211_aes_key_setup_encrypt(const u8 key[]);

void ieee80211_aes_ccm_encrypt(struct crypto_cipher *tfm, u8 *scratch,

			       u8 *b_0, u8 *aad, u8 *data, size_t data_len,

			       u8 *data, size_t data_len,

			       u8 *cdata, u8 *mic);

int ieee80211_aes_ccm_decrypt(struct crypto_cipher *tfm, u8 *scratch,

			      u8 *b_0, u8 *aad, u8 *cdata, size_t data_len,

			      u8 *cdata, size_t data_len,

			      u8 *mic, u8 *data);

void ieee80211_aes_key_free(struct crypto_cipher *tfm);

net/mac80211/wpa.c

+10 −16
Original line number Diff line number Diff line
@@ -274,16 +274,20 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) 
}





static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,

static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,

				int encrypted)

{

	__le16 mask_fc;

	int a4_included;

	u8 qos_tid;

	u8 *b_0, *aad;

	u16 data_len, len_a;

	unsigned int hdrlen;

	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;



	b_0 = scratch + 3 * AES_BLOCK_LEN;

	aad = scratch + 4 * AES_BLOCK_LEN;



	/*

	 * Mask FC: zero subtype b4 b5 b6

	 * Retry, PwrMgt, MoreData; set Protected
@@ -367,7 +371,7 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 
	struct ieee80211_key *key = tx->key;

	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

	int hdrlen, len, tail;

	u8 *pos, *pn, *b_0, *aad, *scratch;

	u8 *pos, *pn;

	int i;



	info->control.icv_len = CCMP_MIC_LEN;
@@ -381,10 +385,6 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 
		return 0;

	}



	scratch = key->u.ccmp.tx_crypto_buf;

	b_0 = scratch + 3 * AES_BLOCK_LEN;

	aad = scratch + 4 * AES_BLOCK_LEN;



	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	len = skb->len - hdrlen;
@@ -420,8 +420,8 @@ static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 
	}



	pos += CCMP_HDR_LEN;

	ccmp_special_blocks(skb, pn, b_0, aad, 0);

	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,

	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);

	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,

				  pos, skb_put(skb, CCMP_MIC_LEN));



	return 0;
@@ -483,16 +483,10 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) 


	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {

		/* hardware didn't decrypt/verify MIC */

		u8 *scratch, *b_0, *aad;



		scratch = key->u.ccmp.rx_crypto_buf;

		b_0 = scratch + 3 * AES_BLOCK_LEN;

		aad = scratch + 4 * AES_BLOCK_LEN;



		ccmp_special_blocks(skb, pn, b_0, aad, 1);

		ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);



		if (ieee80211_aes_ccm_decrypt(

			    key->u.ccmp.tfm, scratch, b_0, aad,

			    key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,

			    skb->data + hdrlen + CCMP_HDR_LEN, data_len,

			    skb->data + skb->len - CCMP_MIC_LEN,

			    skb->data + hdrlen + CCMP_HDR_LEN)) {