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channeld: Track the funding depth while awaiting lockin 

We used to agree up on the `minimum_depth` with the peer, thus when
they told us that the funding locked we'd be sure we either have a
scid or we'd trigger the state transition when we do. However if we
had a scid, and we got a funding_locked we'd trust them not to have
sent it early. Now we explicitly track the depth in the channel while
waiting for the funding to confirm.

Changelog-Fixed: channeld: Enforce our own `minimum_depth` beyond just confirming
This commit is contained in:
Christian Decker 2022-06-02 01:39:53 +02:00
parent 692a001198
commit 29157735fb
3 changed files with 11 additions and 1 deletions
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1
lightningd/channel.c
View File

@ -430,6 +430,7 @@ struct channel *new_channel(struct peer *peer, u64 dbid,
channel->channel_flags = channel_flags;
channel->our_config = *our_config;
channel->minimum_depth = minimum_depth;
channel->depth = 0;
channel->next_index[LOCAL] = next_index_local;
channel->next_index[REMOTE] = next_index_remote;
channel->next_htlc_id = next_htlc_id;

6
lightningd/channel.h
View File

@ -119,6 +119,12 @@ struct channel {
/* Minimum funding depth (specified by us if they fund). */
u32 minimum_depth;
/* Depth of the funding TX as reported by the txout
* watch. Only used while we're in state
* CHANNELD_AWAITING_LOCKING, afterwards the watches do not
* trigger anymore. */
u32 depth;
/* Tracking commitment transaction numbers. */
u64 next_index[NUM_SIDES];
u64 next_htlc_id;

5
lightningd/channel_control.c
View File

@ -256,7 +256,9 @@ static void peer_got_funding_locked(struct channel *channel, const u8 *msg)
/* Remember that we got the lockin */
wallet_channel_save(channel->peer->ld->wallet, channel);
lockin_complete(channel);
if (channel->depth >= channel->minimum_depth)
lockin_complete(channel);
}
static void peer_got_announcement(struct channel *channel, const u8 *msg)
@ -805,6 +807,7 @@ bool channel_tell_depth(struct lightningd *ld,
const char *txidstr;
txidstr = type_to_string(tmpctx, struct bitcoin_txid, txid);
channel->depth = depth;
if (!channel->owner) {
log_debug(channel->log,