ieee80211_add_ssid
frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen);
frm = ieee80211_add_ssid(frm, NULL, 0);
frm = ieee80211_add_ssid(frm, ssid, ssidlen);
frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid,
frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
u_int8_t *ieee80211_add_ssid(u_int8_t *, const u_int8_t *, u_int);