vcap_rule_add_key
return vcap_rule_add_key(rule, key, VCAP_FIELD_BIT, &data);
return vcap_rule_add_key(rule, key, VCAP_FIELD_U32, &data);
return vcap_rule_add_key(rule, key, VCAP_FIELD_U48, &data);
return vcap_rule_add_key(rule, key, VCAP_FIELD_U72, &data);
return vcap_rule_add_key(rule, key, VCAP_FIELD_U128, &data);
return vcap_rule_add_key(rule, key, ftype, data);
err = vcap_rule_add_key(rule,