Replace private implementation of bit rotation and unaligned access
helpers with kernel-provided implementation.
Fold xswap helper in its one usage in the michael_block macro.
Signed-off-by: Harvey Harrison <[email protected]>
---
The new unaligned access helpers have landed in mainline.
net/mac80211/michael.c | 60 +++++++++++------------------------------------
1 files changed, 14 insertions(+), 46 deletions(-)
diff --git a/net/mac80211/michael.c b/net/mac80211/michael.c
index 0f844f7..c1e5897 100644
--- a/net/mac80211/michael.c
+++ b/net/mac80211/michael.c
@@ -8,71 +8,39 @@
*/
#include <linux/types.h>
+#include <linux/bitops.h>
+#include <asm/unaligned.h>
#include "michael.h"
-static inline u32 rotr(u32 val, int bits)
-{
- return (val >> bits) | (val << (32 - bits));
-}
-
-
-static inline u32 rotl(u32 val, int bits)
-{
- return (val << bits) | (val >> (32 - bits));
-}
-
-
-static inline u32 xswap(u32 val)
-{
- return ((val & 0xff00ff00) >> 8) | ((val & 0x00ff00ff) << 8);
-}
-
-
#define michael_block(l, r) \
do { \
- r ^= rotl(l, 17); \
+ r ^= rol32(l, 17); \
l += r; \
- r ^= xswap(l); \
+ r ^= ((l & 0xff00ff00) >> 8) | ((l & 0x00ff00ff) << 8); \
l += r; \
- r ^= rotl(l, 3); \
+ r ^= rol32(l, 3); \
l += r; \
- r ^= rotr(l, 2); \
+ r ^= ror32(l, 2); \
l += r; \
} while (0)
-
-static inline u32 michael_get32(u8 *data)
-{
- return data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
-}
-
-
-static inline void michael_put32(u32 val, u8 *data)
-{
- data[0] = val & 0xff;
- data[1] = (val >> 8) & 0xff;
- data[2] = (val >> 16) & 0xff;
- data[3] = (val >> 24) & 0xff;
-}
-
-
void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
u8 *data, size_t data_len, u8 *mic)
{
u32 l, r, val;
size_t block, blocks, left;
- l = michael_get32(key);
- r = michael_get32(key + 4);
+ l = get_unaligned_le32(key);
+ r = get_unaligned_le32(key + 4);
/* A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
* calculation, but it is _not_ transmitted */
- l ^= michael_get32(da);
+ l ^= get_unaligned_le32(da);
michael_block(l, r);
- l ^= da[4] | (da[5] << 8) | (sa[0] << 16) | (sa[1] << 24);
+ l ^= get_unaligned_le16(&da[4]) | (get_unaligned_le16(sa) << 16);
michael_block(l, r);
- l ^= michael_get32(&sa[2]);
+ l ^= get_unaligned_le32(&sa[2]);
michael_block(l, r);
l ^= priority;
michael_block(l, r);
@@ -82,7 +50,7 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
left = data_len % 4;
for (block = 0; block < blocks; block++) {
- l ^= michael_get32(&data[block * 4]);
+ l ^= get_unaligned_le32(&data[block * 4]);
michael_block(l, r);
}
@@ -99,6 +67,6 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
/* last block is zero, so l ^ 0 = l */
michael_block(l, r);
- michael_put32(l, mic);
- michael_put32(r, mic + 4);
+ put_unaligned_le32(l, mic);
+ put_unaligned_le32(r, mic + 4);
}
--
1.5.5.144.g3e42