Function handle_localpay

lightningd/peer_htlcs.c:360–452

}

static void handle_localpay(struct htlc_in *hin,
			    struct amount_msat amt_to_forward,
			    u32 outgoing_cltv_value,
			    struct amount_msat total_msat,
			    const struct secret *payment_secret,
			    const u8 *payment_metadata)
{
	const u8 *failmsg;
	struct lightningd *ld = hin->key.channel->peer->ld;

	/* BOLT #4:
	 *
	 * For the final node, this value MUST be exactly equal to the
	 * incoming htlc amount, otherwise the HTLC should be rejected.
	 */
	if (!amount_msat_eq(amt_to_forward, hin->msat)) {
		log_debug(hin->key.channel->log,
			  "HTLC %"PRIu64" final incorrect amount:"
			  " %s in, %s expected",
			  hin->key.id,
			  type_to_string(tmpctx, struct amount_msat, &hin->msat),
			  type_to_string(tmpctx, struct amount_msat,
					 &amt_to_forward));
		/* BOLT #4:
		 *
		 * 1. type: 19 (`final_incorrect_htlc_amount`)
		 * 2. data:
		 *    * [`u64`:`incoming_htlc_amt`]
		 *
		 * The amount in the HTLC doesn't match the value in the onion.
		 */
		failmsg = towire_final_incorrect_htlc_amount(NULL, hin->msat);
		goto fail;
	}

	/* BOLT #4:
	 *
	 * 1. type: 18 (`final_incorrect_cltv_expiry`)
	 * 2. data:
	 *    * [`u32`:`cltv_expiry`]
	 *
	 * The CLTV expiry in the HTLC doesn't match the value in the onion.
	 */
	if (!check_cltv(hin, hin->cltv_expiry, outgoing_cltv_value, 0)) {
		failmsg = towire_final_incorrect_cltv_expiry(NULL,
							     hin->cltv_expiry);
		goto fail;
	}

	/* BOLT #4:
	 *
	 *   - if the `cltv_expiry` value is unreasonably near the present:
	 *     - MUST fail the HTLC.
	 *     - MUST return an `incorrect_or_unknown_payment_details` error.
	 */
	if (get_block_height(ld->topology) + ld->config.cltv_final
	    > hin->cltv_expiry) {
		log_debug(hin->key.channel->log,