Correctly set next_commitment_number during splice reconnect
#736
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As pointed out in lightning/bolts#1214, when reconnecting a partially signed `interactive-tx` session, we should set `next_commitment_number` to the current commitment number if we haven't received our peer's `commit_sig`, which tells them they need to retransmit it. More importantly, if our peer behaves correctly and sends us the current commitment number, we must not think that they're late and halt, waiting for them to send `error`. This commit fixes that by allowing our peers to use the current commitment number when they set `next_funding_txid`. Note that we keep retransmitting our `commit_sig` regardless of the value our peer set in `next_commitment_number`, because we need to wait for them to have an opportunity to upgrade. In a future commit we will stop sending spurious `commit_sig`.
This was referenced Dec 13, 2024
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As pointed out in lightning/bolts#1214, when reconnecting a partially signed
interactive-txsession, we should setnext_commitment_numberto the current commitment number if we haven't received our peer'scommit_sig, which tells them they need to retransmit it.More importantly, if our peer behaves correctly and sends us the current commitment number, we must not think that they're late and halt, waiting for them to send
error. This commit fixes that by allowing our peers to use the current commitment number when they setnext_funding_txid.Note that we keep retransmitting our
commit_sigregardless of the value our peer set innext_commitment_number, because we need to wait for them to have an opportunity to upgrade. In a future commit we will stop sending spuriouscommit_sig.This PR must only be merged once ACINQ/eclair#2965 has been deployed on the ACINQ node.