GMAC_AAD_LEN
aead_req = kzalloc(reqsize + IEEE80211_GMAC_MIC_LEN + GMAC_AAD_LEN,
memcpy(__aad, aad, GMAC_AAD_LEN);
sg_set_buf(&sg[0], __aad, GMAC_AAD_LEN);
sg_set_buf(&sg[0], __aad, GMAC_AAD_LEN);
aead_request_set_ad(aead_req, GMAC_AAD_LEN + data_len);
u8 aad[GMAC_AAD_LEN];
u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN];