Function check_nonfinal_tlv

common/onion_decode.c:18–31

BOLT #4: * - If `encrypted_recipient_data` is present: *... * - If it is not the final node: * - MUST return an error if the payload contains other tlv fields than * `encrypted_recipient_data` and `current_path_key`. */

 *         `encrypted_recipient_data` and `current_path_key`.
 */
static bool check_nonfinal_tlv(const struct tlv_payload *tlv,
			       u64 *failtlvtype)
{
	for (size_t i = 0; i < tal_count(tlv->fields); i++) {
		switch (tlv->fields[i].numtype) {
		case TLV_PAYLOAD_CURRENT_PATH_KEY:
		case TLV_PAYLOAD_ENCRYPTED_RECIPIENT_DATA:
			continue;
		}
		*failtlvtype = tlv->fields[i].numtype;
		return false;
	}
	return true;
}

/* BOLT #4:
 * - If `encrypted_recipient_data` is present: