diff options
| author | Jouni Malinen <jouni@codeaurora.org> | 2020-02-22 14:25:45 +0100 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2020-02-24 10:36:03 +0100 |
| commit | 2d5d4b0a6da1271a7dfa9a7052870361e72ba424 (patch) | |
| tree | a32a4b58f00f084d32af11e7386fccac93e15947 /net/mac80211/aes_cmac.c | |
| parent | mac80211: Support BIGTK configuration for Beacon protection (diff) | |
| download | linux-2d5d4b0a6da1271a7dfa9a7052870361e72ba424.tar.xz linux-2d5d4b0a6da1271a7dfa9a7052870361e72ba424.zip | |
mac80211: Update BIP to support Beacon frames
When BIP is used to protect Beacon frames, the Timestamp field is masked
to zero. Otherwise, the BIP processing is identical to the way it was
already used with group-addressed Robust Management frames.
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Link: https://lore.kernel.org/r/20200222132548.20835-4-jouni@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/aes_cmac.c')
| -rw-r--r-- | net/mac80211/aes_cmac.c | 21 |
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); } |