Return channel_updates when failing a HTLC for fee/CLTV reasons

diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs
index 73b4ecca304ae1676bf231d8f28f6c2c10079170..27f470d40f8a0e6182b677ac925dd20687cd21ca 100644 (file)
--- a/src/ln/channelmanager.rs
+++ b/src/ln/channelmanager.rs
@@ -1657,14 +1657,14 @@ impl ChannelMessageHandler for ChannelManager {
                        let fee = chan.get_our_fee_base_msat(&*self.fee_estimator) + (pending_forward_info.amt_to_forward * self.fee_proportional_millionths as u64 / 1000000) as u32;
                        if msg.amount_msat < fee as u64 || (msg.amount_msat - fee as u64) < pending_forward_info.amt_to_forward {
                                log_debug!(self, "HTLC {} incorrect amount: in {} out {} fee required {}", msg.htlc_id, msg.amount_msat, pending_forward_info.amt_to_forward, fee);
-                               //TODO: send back "channel_update" with new fee parameters in onion failure packet
-                               return_err!("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, &[0;0]);
+                               let chan_update = self.get_channel_update(chan).unwrap();
+                               return_err!("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, &chan_update.encode_with_len()[..]);
                        }
                        if (msg.cltv_expiry as u64) < pending_forward_info.outgoing_cltv_value as u64 + CLTV_EXPIRY_DELTA as u64 {
                                log_debug!(self, "HTLC {} incorrect CLTV: in {} out {} delta required {}", msg.htlc_id, msg.cltv_expiry, pending_forward_info.outgoing_cltv_value, CLTV_EXPIRY_DELTA);
-                               return_err!("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, &[0;0]);
+                               let chan_update = self.get_channel_update(chan).unwrap();
+                               return_err!("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, &chan_update.encode_with_len()[..]);
                        }
-
                        if !chan.is_live() {
                                let chan_update = self.get_channel_update(chan).unwrap();
                                return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);