ieee80211_tkip_add_iv
ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key_conf *keyconf, u64 pn);
EXPORT_SYMBOL_GPL(ieee80211_tkip_add_iv);
pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);