Function handle_localpay

lightningd/peer_htlcs.c:435–552

}

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 amount_msat *invoice_msat_override,
			    const struct secret *payment_secret,
			    const u8 *payment_metadata)
{
	const u8 *failmsg;
	struct lightningd *ld = hin->key.channel->peer->ld;

	/* BOLT #4:
	 *   - If it is the final node:
	 *     - MUST treat `total_msat` as if it were equal to `amt_to_forward` if it
	 *       is not present.
	 *     - MUST return an error if:
	 *        - incoming `amount_msat` < `amt_to_forward`.
	 */
	if (amount_msat_less(hin->msat, amt_to_forward)) {
		log_debug(hin->key.channel->log,
			  "HTLC %"PRIu64" final incorrect amount:"
			  " %s in, %s expected",
			  hin->key.id,
			  fmt_amount_msat(tmpctx, hin->msat),
			  fmt_amount_msat(tmpctx, amt_to_forward));
		/* BOLT #4:
		 * 1. type: 19 (`final_incorrect_htlc_amount`)
		 * 2. data:
		 *    * [`u64`:`incoming_htlc_amt`]
		 *
		 * The amount in the HTLC is less than the value in the onion.
		 */
		failmsg = towire_final_incorrect_htlc_amount(NULL, hin->msat);
		goto fail;
	}

	/* BOLT #4:
	 *   - If it is the final node:
	 *     - MUST treat `total_msat` as if it were equal to `amt_to_forward` if it
	 *       is not present.
	 *     - MUST return an error if:
	 *...
	 *        - incoming `cltv_expiry` < `outgoing_cltv_value`.
	 */
	if (!check_cltv(hin, hin->cltv_expiry, outgoing_cltv_value, 0)) {
		/* BOLT #4:
		 *
		 * 1. type: 18 (`final_incorrect_cltv_expiry`)
		 * 2. data:
		 *    * [`u32`:`cltv_expiry`]
		 *
		 * The CLTV expiry in the HTLC is less than the value in the onion.
		 */
		failmsg = towire_final_incorrect_cltv_expiry(NULL,
							     hin->cltv_expiry);
		goto fail;
	}