static struct conn *                                     
conn_not_found(...)
{
    if (commit) {
        struct conn_key_node *fwd_key_node, *rev_key_node;
        struct zone_limit *zl = zone_limit_lookup_or_default(ct,
                                                             ctx->key.zone);
        if (zl && atomic_count_get(&zl->czl.count) >= zl->czl.limit) {
            return nc;
        }
        ...
        if (zl) {
            nc->admit_zone = zl->czl.zone;
            nc->zone_limit_seq = zl->czl.zone_limit_seq;
            atomic_count_inc(&zl->czl.count);
        } else {
            nc->admit_zone = INVALID_ZONE;
        }
}