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Diffstat (limited to 'net/mac80211/aes_cmac.c')
-rw-r--r--net/mac80211/aes_cmac.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
index 57748cab0e28..b31f1021ad9c 100644
--- a/net/mac80211/aes_cmac.c
+++ b/net/mac80211/aes_cmac.c
@@ -26,12 +26,20 @@ void ieee80211_aes_cmac(struct crypto_shash *tfm, const u8 *aad,
{
SHASH_DESC_ON_STACK(desc, tfm);
u8 out[AES_BLOCK_SIZE];
+ const __le16 *fc;
desc->tfm = tfm;
crypto_shash_init(desc);
crypto_shash_update(desc, aad, AAD_LEN);
- crypto_shash_update(desc, data, data_len - CMAC_TLEN);
+ fc = (const __le16 *)aad;
+ if (ieee80211_is_beacon(*fc)) {
+ /* mask Timestamp field to zero */
+ crypto_shash_update(desc, zero, 8);
+ crypto_shash_update(desc, data + 8, data_len - 8 - CMAC_TLEN);
+ } else {
+ crypto_shash_update(desc, data, data_len - CMAC_TLEN);
+ }
crypto_shash_finup(desc, zero, CMAC_TLEN, out);
memcpy(mic, out, CMAC_TLEN);
@@ -41,12 +49,21 @@ void ieee80211_aes_cmac_256(struct crypto_shash *tfm, const u8 *aad,
const u8 *data, size_t data_len, u8 *mic)
{
SHASH_DESC_ON_STACK(desc, tfm);
+ const __le16 *fc;
desc->tfm = tfm;
crypto_shash_init(desc);
crypto_shash_update(desc, aad, AAD_LEN);
- crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
+ fc = (const __le16 *)aad;
+ if (ieee80211_is_beacon(*fc)) {
+ /* mask Timestamp field to zero */
+ crypto_shash_update(desc, zero, 8);
+ crypto_shash_update(desc, data + 8,
+ data_len - 8 - CMAC_TLEN_256);
+ } else {
+ crypto_shash_update(desc, data, data_len - CMAC_TLEN_256);
+ }
crypto_shash_finup(desc, zero, CMAC_TLEN_256, mic);
}