NL80211_ATTR_BEACON_HEAD
if (attrs[NL80211_ATTR_BEACON_HEAD]) {
bcn->head = nla_data(attrs[NL80211_ATTR_BEACON_HEAD]);
bcn->head_len = nla_len(attrs[NL80211_ATTR_BEACON_HEAD]);
!info->attrs[NL80211_ATTR_BEACON_HEAD])
[NL80211_ATTR_BEACON_HEAD] =