1 files changed, 94 insertions, 164 deletions

diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 09093da24af6..e710243d82e2 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -6,25 +6,23 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
 #include <linux/kernel.h>
+#include <linux/bitops.h>
 #include <linux/types.h>
 #include <linux/netdevice.h>
+#include <asm/unaligned.h>
 
 #include <net/mac80211.h>
 #include "key.h"
 #include "tkip.h"
 #include "wep.h"
 
-
-/* TKIP key mixing functions */
-
-
 #define PHASE1_LOOP_COUNT 8
 
-
-/* 2-byte by 2-byte subset of the full AES S-box table; second part of this
- * table is identical to first part but byte-swapped */
+/*
+ * 2-byte by 2-byte subset of the full AES S-box table; second part of this
+ * table is identical to first part but byte-swapped
+ */
 static const u16 tkip_sbox[256] =
 {
 	0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
@@ -61,84 +59,54 @@ static const u16 tkip_sbox[256] =
 	0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
 };
 
-
-static inline u16 Mk16(u8 x, u8 y)
+static u16 tkipS(u16 val)
 {
-	return ((u16) x << 8) | (u16) y;
+	return tkip_sbox[val & 0xff] ^ swab16(tkip_sbox[val >> 8]);
 }
 
-
-static inline u8 Hi8(u16 v)
-{
-	return v >> 8;
-}
-
-
-static inline u8 Lo8(u16 v)
-{
-	return v & 0xff;
-}
-
-
-static inline u16 Hi16(u32 v)
-{
-	return v >> 16;
-}
-
-
-static inline u16 Lo16(u32 v)
-{
-	return v & 0xffff;
-}
-
-
-static inline u16 RotR1(u16 v)
-{
-	return (v >> 1) | ((v & 0x0001) << 15);
-}
-
-
-static inline u16 tkip_S(u16 val)
+static u8 *write_tkip_iv(u8 *pos, u16 iv16)
 {
-	u16 a = tkip_sbox[Hi8(val)];
-
-	return tkip_sbox[Lo8(val)] ^ Hi8(a) ^ (Lo8(a) << 8);
+	*pos++ = iv16 >> 8;
+	*pos++ = ((iv16 >> 8) | 0x20) & 0x7f;
+	*pos++ = iv16 & 0xFF;
+	return pos;
 }
 
-
-
-/* P1K := Phase1(TA, TK, TSC)
+/*
+ * P1K := Phase1(TA, TK, TSC)
  * TA = transmitter address (48 bits)
  * TK = dot11DefaultKeyValue or dot11KeyMappingValue (128 bits)
  * TSC = TKIP sequence counter (48 bits, only 32 msb bits used)
  * P1K: 80 bits
  */
-static void tkip_mixing_phase1(const u8 *ta, const u8 *tk, u32 tsc_IV32,
-			       u16 *p1k)
+static void tkip_mixing_phase1(const u8 *tk, struct tkip_ctx *ctx,
+			       const u8 *ta, u32 tsc_IV32)
 {
 	int i, j;
+	u16 *p1k = ctx->p1k;
 
-	p1k[0] = Lo16(tsc_IV32);
-	p1k[1] = Hi16(tsc_IV32);
-	p1k[2] = Mk16(ta[1], ta[0]);
-	p1k[3] = Mk16(ta[3], ta[2]);
-	p1k[4] = Mk16(ta[5], ta[4]);
+	p1k[0] = tsc_IV32 & 0xFFFF;
+	p1k[1] = tsc_IV32 >> 16;
+	p1k[2] = get_unaligned_le16(ta + 0);
+	p1k[3] = get_unaligned_le16(ta + 2);
+	p1k[4] = get_unaligned_le16(ta + 4);
 
 	for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
 		j = 2 * (i & 1);
-		p1k[0] += tkip_S(p1k[4] ^ Mk16(tk[ 1 + j], tk[ 0 + j]));
-		p1k[1] += tkip_S(p1k[0] ^ Mk16(tk[ 5 + j], tk[ 4 + j]));
-		p1k[2] += tkip_S(p1k[1] ^ Mk16(tk[ 9 + j], tk[ 8 + j]));
-		p1k[3] += tkip_S(p1k[2] ^ Mk16(tk[13 + j], tk[12 + j]));
-		p1k[4] += tkip_S(p1k[3] ^ Mk16(tk[ 1 + j], tk[ 0 + j])) + i;
+		p1k[0] += tkipS(p1k[4] ^ get_unaligned_le16(tk + 0 + j));
+		p1k[1] += tkipS(p1k[0] ^ get_unaligned_le16(tk + 4 + j));
+		p1k[2] += tkipS(p1k[1] ^ get_unaligned_le16(tk + 8 + j));
+		p1k[3] += tkipS(p1k[2] ^ get_unaligned_le16(tk + 12 + j));
+		p1k[4] += tkipS(p1k[3] ^ get_unaligned_le16(tk + 0 + j)) + i;
 	}
+	ctx->initialized = 1;
 }
 
-
-static void tkip_mixing_phase2(const u16 *p1k, const u8 *tk, u16 tsc_IV16,
-			       u8 *rc4key)
+static void tkip_mixing_phase2(const u8 *tk, struct tkip_ctx *ctx,
+			       u16 tsc_IV16, u8 *rc4key)
 {
 	u16 ppk[6];
+	const u16 *p1k = ctx->p1k;
 	int i;
 
 	ppk[0] = p1k[0];
@@ -148,70 +116,35 @@ static void tkip_mixing_phase2(const u16 *p1k, const u8 *tk, u16 tsc_IV16,
 	ppk[4] = p1k[4];
 	ppk[5] = p1k[4] + tsc_IV16;
 
-	ppk[0] += tkip_S(ppk[5] ^ Mk16(tk[ 1], tk[ 0]));
-	ppk[1] += tkip_S(ppk[0] ^ Mk16(tk[ 3], tk[ 2]));
-	ppk[2] += tkip_S(ppk[1] ^ Mk16(tk[ 5], tk[ 4]));
-	ppk[3] += tkip_S(ppk[2] ^ Mk16(tk[ 7], tk[ 6]));
-	ppk[4] += tkip_S(ppk[3] ^ Mk16(tk[ 9], tk[ 8]));
-	ppk[5] += tkip_S(ppk[4] ^ Mk16(tk[11], tk[10]));
-	ppk[0] +=  RotR1(ppk[5] ^ Mk16(tk[13], tk[12]));
-	ppk[1] +=  RotR1(ppk[0] ^ Mk16(tk[15], tk[14]));
-	ppk[2] +=  RotR1(ppk[1]);
-	ppk[3] +=  RotR1(ppk[2]);
-	ppk[4] +=  RotR1(ppk[3]);
-	ppk[5] +=  RotR1(ppk[4]);
-
-	rc4key[0] = Hi8(tsc_IV16);
-	rc4key[1] = (Hi8(tsc_IV16) | 0x20) & 0x7f;
-	rc4key[2] = Lo8(tsc_IV16);
-	rc4key[3] = Lo8((ppk[5] ^ Mk16(tk[1], tk[0])) >> 1);
-
-	for (i = 0; i < 6; i++) {
-		rc4key[4 + 2 * i] = Lo8(ppk[i]);
-		rc4key[5 + 2 * i] = Hi8(ppk[i]);
-	}
+	ppk[0] += tkipS(ppk[5] ^ get_unaligned_le16(tk + 0));
+	ppk[1] += tkipS(ppk[0] ^ get_unaligned_le16(tk + 2));
+	ppk[2] += tkipS(ppk[1] ^ get_unaligned_le16(tk + 4));
+	ppk[3] += tkipS(ppk[2] ^ get_unaligned_le16(tk + 6));
+	ppk[4] += tkipS(ppk[3] ^ get_unaligned_le16(tk + 8));
+	ppk[5] += tkipS(ppk[4] ^ get_unaligned_le16(tk + 10));
+	ppk[0] += ror16(ppk[5] ^ get_unaligned_le16(tk + 12), 1);
+	ppk[1] += ror16(ppk[0] ^ get_unaligned_le16(tk + 14), 1);
+	ppk[2] += ror16(ppk[1], 1);
+	ppk[3] += ror16(ppk[2], 1);
+	ppk[4] += ror16(ppk[3], 1);
+	ppk[5] += ror16(ppk[4], 1);
+
+	rc4key = write_tkip_iv(rc4key, tsc_IV16);
+	*rc4key++ = ((ppk[5] ^ get_unaligned_le16(tk)) >> 1) & 0xFF;
+
+	for (i = 0; i < 6; i++)
+		put_unaligned_le16(ppk[i], rc4key + 2 * i);
 }
 
-
 /* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets
  * of the IV. Returns pointer to the octet following IVs (i.e., beginning of
  * the packet payload). */
-u8 * ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key,
-			   u8 iv0, u8 iv1, u8 iv2)
+u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16)
 {
-	*pos++ = iv0;
-	*pos++ = iv1;
-	*pos++ = iv2;
+	pos = write_tkip_iv(pos, iv16);
 	*pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;
-	*pos++ = key->u.tkip.iv32 & 0xff;
-	*pos++ = (key->u.tkip.iv32 >> 8) & 0xff;
-	*pos++ = (key->u.tkip.iv32 >> 16) & 0xff;
-	*pos++ = (key->u.tkip.iv32 >> 24) & 0xff;
-	return pos;
-}
-
-
-void ieee80211_tkip_gen_phase1key(struct ieee80211_key *key, u8 *ta,
-				  u16 *phase1key)
-{
-	tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-			   key->u.tkip.iv32, phase1key);
-}
-
-void ieee80211_tkip_gen_rc4key(struct ieee80211_key *key, u8 *ta,
-			       u8 *rc4key)
-{
-	/* Calculate per-packet key */
-	if (key->u.tkip.iv16 == 0 || !key->u.tkip.tx_initialized) {
-		/* IV16 wrapped around - perform TKIP phase 1 */
-		tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-				   key->u.tkip.iv32, key->u.tkip.p1k);
-		key->u.tkip.tx_initialized = 1;
-	}
-
-	tkip_mixing_phase2(key->u.tkip.p1k,
-			   &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-			   key->u.tkip.iv16, rc4key);
+	put_unaligned_le32(key->u.tkip.tx.iv32, pos);
+	return pos + 4;
 }
 
 void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
@@ -220,26 +153,27 @@ void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
 {
 	struct ieee80211_key *key = (struct ieee80211_key *)
 			container_of(keyconf, struct ieee80211_key, conf);
-	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
-	u8 *data = (u8 *) hdr;
-	u16 fc = le16_to_cpu(hdr->frame_control);
-	int hdr_len = ieee80211_get_hdrlen(fc);
-	u8 *ta = hdr->addr2;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	u8 *data;
+	const u8 *tk;
+	struct tkip_ctx *ctx;
 	u16 iv16;
 	u32 iv32;
 
-	iv16 = data[hdr_len] << 8;
-	iv16 += data[hdr_len + 2];
-	iv32 = data[hdr_len + 4] | (data[hdr_len + 5] << 8) |
-	       (data[hdr_len + 6] << 16) | (data[hdr_len + 7] << 24);
+	data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
+	iv16 = data[2] | (data[0] << 8);
+	iv32 = get_unaligned_le32(&data[4]);
+
+	tk = &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY];
+	ctx = &key->u.tkip.tx;
 
 #ifdef CONFIG_TKIP_DEBUG
 	printk(KERN_DEBUG "TKIP encrypt: iv16 = 0x%04x, iv32 = 0x%08x\n",
 			iv16, iv32);
 
-	if (iv32 != key->u.tkip.iv32) {
+	if (iv32 != ctx->iv32) {
 		printk(KERN_DEBUG "skb: iv32 = 0x%08x key: iv32 = 0x%08x\n",
-			iv32, key->u.tkip.iv32);
+			iv32, ctx->iv32);
 		printk(KERN_DEBUG "Wrap around of iv16 in the middle of a "
 			"fragmented packet\n");
 	}
@@ -248,20 +182,15 @@ void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
 	/* Update the p1k only when the iv16 in the packet wraps around, this
 	 * might occur after the wrap around of iv16 in the key in case of
 	 * fragmented packets. */
-	if (iv16 == 0 || !key->u.tkip.tx_initialized) {
-		/* IV16 wrapped around - perform TKIP phase 1 */
-		tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-			iv32, key->u.tkip.p1k);
-		key->u.tkip.tx_initialized = 1;
-	}
+	if (iv16 == 0 || !ctx->initialized)
+		tkip_mixing_phase1(tk, ctx, hdr->addr2, iv32);
 
 	if (type == IEEE80211_TKIP_P1_KEY) {
-		memcpy(outkey, key->u.tkip.p1k, sizeof(u16) * 5);
+		memcpy(outkey, ctx->p1k, sizeof(u16) * 5);
 		return;
 	}
 
-	tkip_mixing_phase2(key->u.tkip.p1k,
-		&key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],	iv16, outkey);
+	tkip_mixing_phase2(tk, ctx, iv16, outkey);
 }
 EXPORT_SYMBOL(ieee80211_get_tkip_key);
 
@@ -275,13 +204,19 @@ void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
 				 u8 *pos, size_t payload_len, u8 *ta)
 {
 	u8 rc4key[16];
+	struct tkip_ctx *ctx = &key->u.tkip.tx;
+	const u8 *tk = &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY];
+
+	/* Calculate per-packet key */
+	if (ctx->iv16 == 0 || !ctx->initialized)
+		tkip_mixing_phase1(tk, ctx, ta, ctx->iv32);
+
+	tkip_mixing_phase2(tk, ctx, ctx->iv16, rc4key);
 
-	ieee80211_tkip_gen_rc4key(key, ta, rc4key);
-	pos = ieee80211_tkip_add_iv(pos, key, rc4key[0], rc4key[1], rc4key[2]);
+	pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
 	ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
 }
 
-
 /* Decrypt packet payload with TKIP using @key. @pos is a pointer to the
  * beginning of the buffer containing IEEE 802.11 header payload, i.e.,
  * including IV, Ext. IV, real data, Michael MIC, ICV. @payload_len is the
@@ -296,13 +231,14 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
 	u32 iv16;
 	u8 rc4key[16], keyid, *pos = payload;
 	int res;
+	const u8 *tk = &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY];
 
 	if (payload_len < 12)
 		return -1;
 
 	iv16 = (pos[0] << 8) | pos[2];
 	keyid = pos[3];
-	iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
+	iv32 = get_unaligned_le32(pos + 4);
 	pos += 8;
 #ifdef CONFIG_TKIP_DEBUG
 	{
@@ -322,33 +258,31 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
 	if ((keyid >> 6) != key->conf.keyidx)
 		return TKIP_DECRYPT_INVALID_KEYIDX;
 
-	if (key->u.tkip.rx_initialized[queue] &&
-	    (iv32 < key->u.tkip.iv32_rx[queue] ||
-	     (iv32 == key->u.tkip.iv32_rx[queue] &&
-	      iv16 <= key->u.tkip.iv16_rx[queue]))) {
+	if (key->u.tkip.rx[queue].initialized &&
+	    (iv32 < key->u.tkip.rx[queue].iv32 ||
+	     (iv32 == key->u.tkip.rx[queue].iv32 &&
+	      iv16 <= key->u.tkip.rx[queue].iv16))) {
 #ifdef CONFIG_TKIP_DEBUG
 		DECLARE_MAC_BUF(mac);
 		printk(KERN_DEBUG "TKIP replay detected for RX frame from "
 		       "%s (RX IV (%04x,%02x) <= prev. IV (%04x,%02x)\n",
 		       print_mac(mac, ta),
-		       iv32, iv16, key->u.tkip.iv32_rx[queue],
-		       key->u.tkip.iv16_rx[queue]);
+		       iv32, iv16, key->u.tkip.rx[queue].iv32,
+		       key->u.tkip.rx[queue].iv16);
 #endif /* CONFIG_TKIP_DEBUG */
 		return TKIP_DECRYPT_REPLAY;
 	}
 
 	if (only_iv) {
 		res = TKIP_DECRYPT_OK;
-		key->u.tkip.rx_initialized[queue] = 1;
+		key->u.tkip.rx[queue].initialized = 1;
 		goto done;
 	}
 
-	if (!key->u.tkip.rx_initialized[queue] ||
-	    key->u.tkip.iv32_rx[queue] != iv32) {
-		key->u.tkip.rx_initialized[queue] = 1;
+	if (!key->u.tkip.rx[queue].initialized ||
+	    key->u.tkip.rx[queue].iv32 != iv32) {
 		/* IV16 wrapped around - perform TKIP phase 1 */
-		tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-				   iv32, key->u.tkip.p1k_rx[queue]);
+		tkip_mixing_phase1(tk, &key->u.tkip.rx[queue], ta, iv32);
 #ifdef CONFIG_TKIP_DEBUG
 		{
 			int i;
@@ -362,7 +296,7 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
 			printk("\n");
 			printk(KERN_DEBUG "TKIP decrypt: P1K=");
 			for (i = 0; i < 5; i++)
-				printk("%04x ", key->u.tkip.p1k_rx[queue][i]);
+				printk("%04x ", key->u.tkip.rx[queue].p1k[i]);
 			printk("\n");
 		}
 #endif /* CONFIG_TKIP_DEBUG */
@@ -377,13 +311,11 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
 
 			key->local->ops->update_tkip_key(
 				local_to_hw(key->local), &key->conf,
-				sta_addr, iv32, key->u.tkip.p1k_rx[queue]);
+				sta_addr, iv32, key->u.tkip.rx[queue].p1k);
 		}
 	}
 
-	tkip_mixing_phase2(key->u.tkip.p1k_rx[queue],
-			   &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
-			   iv16, rc4key);
+	tkip_mixing_phase2(tk, &key->u.tkip.rx[queue], iv16, rc4key);
 #ifdef CONFIG_TKIP_DEBUG
 	{
 		int i;
@@ -409,5 +341,3 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
 
 	return res;
 }
-
-