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04-onion-routing.md
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@ -1158,9 +1158,12 @@ The ephemeral key was unparsable by the processing node.
2. data:
* [`u16`:`len`]
* [`len*byte`:`channel_update`]
* [`u8`:`capacity_order`] (`option_capacity_order`)
The channel from the processing node was unable to handle this HTLC,
but may be able to handle it, or others, later.
but may be able to handle it, or others, later. The optional
`capacity_order` field gives a very rough indication of how far over
the channel capacity this htlc amount was.
1. type: PERM|8 (`permanent_channel_failure`)
@ -1341,6 +1344,8 @@ A _forwarding node_ MAY, but a _final node_ MUST NOT:
transient error occurs in the outgoing channel (e.g. channel capacity reached,
too many in-flight HTLCs, etc.):
- return a `temporary_channel_failure` error.
- MAY set `capacity_order` to the approximate number of powers of 2 that the HTLC amount exceeded the available capacity.
- SHOULD randomize `capacity_order`.
- if an otherwise unspecified, permanent error occurs during forwarding to its
receiving peer (e.g. channel recently closed):
- return a `permanent_channel_failure` error.