diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-07-21 15:05:58 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-21 15:05:58 +0200 |
commit | 1c29dd9a9e2f83ffb02e50bb3619c3b9db8fd526 (patch) | |
tree | b5691dd5aa48ac32fdbaef44afcbcc92f01592d3 /net/mac80211/michael.c | |
parent | 32172561889868c0ea422ea8570f0413963a815f (diff) | |
parent | 14b395e35d1afdd8019d11b92e28041fad591b71 (diff) |
Merge branch 'linus' into x86/paravirt-spinlocks
Diffstat (limited to 'net/mac80211/michael.c')
-rw-r--r-- | net/mac80211/michael.c | 116 |
1 files changed, 49 insertions, 67 deletions
diff --git a/net/mac80211/michael.c b/net/mac80211/michael.c index 0f844f7895f..408649bd470 100644 --- a/net/mac80211/michael.c +++ b/net/mac80211/michael.c @@ -6,85 +6,68 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ - #include <linux/types.h> +#include <linux/bitops.h> +#include <linux/ieee80211.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); \ - l += r; \ - r ^= xswap(l); \ - l += r; \ - r ^= rotl(l, 3); \ - l += r; \ - r ^= rotr(l, 2); \ - l += r; \ -} while (0) - - -static inline u32 michael_get32(u8 *data) +static void michael_block(struct michael_mic_ctx *mctx, u32 val) { - return data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24); + mctx->l ^= val; + mctx->r ^= rol32(mctx->l, 17); + mctx->l += mctx->r; + mctx->r ^= ((mctx->l & 0xff00ff00) >> 8) | + ((mctx->l & 0x00ff00ff) << 8); + mctx->l += mctx->r; + mctx->r ^= rol32(mctx->l, 3); + mctx->l += mctx->r; + mctx->r ^= ror32(mctx->l, 2); + mctx->l += mctx->r; } - -static inline void michael_put32(u32 val, u8 *data) +static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key, + struct ieee80211_hdr *hdr) { - data[0] = val & 0xff; - data[1] = (val >> 8) & 0xff; - data[2] = (val >> 16) & 0xff; - data[3] = (val >> 24) & 0xff; + u8 *da, *sa, tid; + + da = ieee80211_get_DA(hdr); + sa = ieee80211_get_SA(hdr); + if (ieee80211_is_data_qos(hdr->frame_control)) + tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; + else + tid = 0; + + mctx->l = get_unaligned_le32(key); + mctx->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 + */ + michael_block(mctx, get_unaligned_le32(da)); + michael_block(mctx, get_unaligned_le16(&da[4]) | + (get_unaligned_le16(sa) << 16)); + michael_block(mctx, get_unaligned_le32(&sa[2])); + michael_block(mctx, tid); } - -void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority, - u8 *data, size_t data_len, u8 *mic) +void michael_mic(const u8 *key, struct ieee80211_hdr *hdr, + const u8 *data, size_t data_len, u8 *mic) { - u32 l, r, val; + u32 val; size_t block, blocks, left; + struct michael_mic_ctx mctx; - l = michael_get32(key); - r = michael_get32(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); - michael_block(l, r); - l ^= da[4] | (da[5] << 8) | (sa[0] << 16) | (sa[1] << 24); - michael_block(l, r); - l ^= michael_get32(&sa[2]); - michael_block(l, r); - l ^= priority; - michael_block(l, r); + michael_mic_hdr(&mctx, key, hdr); /* Real data */ blocks = data_len / 4; left = data_len % 4; - for (block = 0; block < blocks; block++) { - l ^= michael_get32(&data[block * 4]); - michael_block(l, r); - } + for (block = 0; block < blocks; block++) + michael_block(&mctx, get_unaligned_le32(&data[block * 4])); /* Partial block of 0..3 bytes and padding: 0x5a + 4..7 zeros to make * total length a multiple of 4. */ @@ -94,11 +77,10 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority, left--; val |= data[blocks * 4 + left]; } - l ^= val; - michael_block(l, r); - /* last block is zero, so l ^ 0 = l */ - michael_block(l, r); - michael_put32(l, mic); - michael_put32(r, mic + 4); + michael_block(&mctx, val); + michael_block(&mctx, 0); + + put_unaligned_le32(mctx.l, mic); + put_unaligned_le32(mctx.r, mic + 4); } |