ieee80211_parse_rsn_cipher
rsn->rsn_groupcipher = ieee80211_parse_rsn_cipher(frm);
rsn->rsn_ciphers |= ieee80211_parse_rsn_cipher(frm);
rsn->rsn_groupmgmtcipher = ieee80211_parse_rsn_cipher(frm);
enum ieee80211_cipher ieee80211_parse_rsn_cipher(const u_int8_t *);