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Dual-funding spec edits, cleanup #4410

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merged 7 commits into from
Mar 9, 2021
Merged

Dual-funding spec edits, cleanup #4410

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2d3a5c7
dual-fund: remove all references to PODLEs
niftynei Feb 23, 2021
9d0e5e4
df-spec: consolidate dual-funding patches, update feerate protocol
niftynei Mar 2, 2021
29adf9d
df-spec: use an empty bit-set as the basepoint for chan-id at start
niftynei Mar 3, 2021
8e8ac2e
psbt: mark psbt arg as const for `psbt_compute_fee`
niftynei Mar 3, 2021
e328b9c
bitcoin: method for finding weight of 'wally_tx'
niftynei Mar 3, 2021
0d92650
df: fail channel if peer sends witnesses that aren't paid for
niftynei Mar 3, 2021
3ef059b
df-spec: limit allowable inputs/outputs to 252
niftynei Mar 3, 2021
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2 changes: 1 addition & 1 deletion common/channel_id.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ void derive_channel_id_v2(struct channel_id *channel_id,
const struct pubkey *basepoint_1,
const struct pubkey *basepoint_2)
{
/* BOLT-df8bb5994d99e4c78053f7cb57694795f8393dc5 #2:
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* `channel_id`, v2
* For channels established using the v2 protocol, the
* `channel_id` is the
Expand Down
4 changes: 2 additions & 2 deletions common/psbt_internal.c
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Expand Up @@ -67,8 +67,8 @@ psbt_to_witness_stacks(const tal_t *ctx,
/* FIXME: throw an error ? */
return NULL;

/* BOLT-78de9a79b491ae9fb84b1fdb4546bacf642dce87 #2:
* - if is the `initiator`:
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* - if is the *initiator*:
* - MUST send even `serial_id`s
*/
if (serial_id % 2 == side_to_stack) {
Expand Down
105 changes: 22 additions & 83 deletions lightningd/dual_open_control.c
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Expand Up @@ -232,9 +232,7 @@ struct openchannel2_payload {
struct amount_sat dust_limit_satoshis;
struct amount_msat max_htlc_value_in_flight_msat;
struct amount_msat htlc_minimum_msat;
u32 funding_feerate_max;
u32 funding_feerate_min;
u32 funding_feerate_best;
u32 funding_feerate_per_kw;
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I can't remember why we decided on this. I guess simplicity, and to mirror RBF where you need to decide whether to contribute anyway?

u32 feerate_our_max;
u32 feerate_our_min;
u32 commitment_feerate_per_kw;
Expand All @@ -245,7 +243,6 @@ struct openchannel2_payload {
u8 *shutdown_scriptpubkey;

struct amount_sat accepter_funding;
u32 funding_feerate_per_kw;
struct wally_psbt *psbt;
const u8 *our_shutdown_scriptpubkey;
char *err_msg;
Expand All @@ -266,18 +263,14 @@ openchannel2_hook_serialize(struct openchannel2_payload *payload,
payload->max_htlc_value_in_flight_msat);
json_add_amount_msat_only(stream, "htlc_minimum_msat",
payload->htlc_minimum_msat);
json_add_num(stream, "funding_feerate_max",
payload->funding_feerate_max);
json_add_num(stream, "funding_feerate_min",
payload->funding_feerate_min);
json_add_num(stream, "funding_feerate_best",
payload->funding_feerate_best);
json_add_num(stream, "funding_feerate_per_kw",
payload->funding_feerate_per_kw);
json_add_num(stream, "commitment_feerate_per_kw",
payload->commitment_feerate_per_kw);
json_add_num(stream, "feerate_our_max",
payload->feerate_our_max);
json_add_num(stream, "feerate_our_min",
payload->feerate_our_min);
json_add_num(stream, "commitment_feerate_per_kw",
payload->commitment_feerate_per_kw);
json_add_num(stream, "to_self_delay", payload->to_self_delay);
json_add_num(stream, "max_accepted_htlcs", payload->max_accepted_htlcs);
json_add_num(stream, "channel_flags", payload->channel_flags);
Expand Down Expand Up @@ -689,38 +682,11 @@ openchannel2_hook_cb(struct openchannel2_payload *payload STEALS)
return subd_send_msg(dualopend, take(msg));
}

/* If there's no plugin, the funding_feerate_per_kw will be zero.
* In this case, we set the funding_feerate_per_kw to the default,
* the 'best' */
if (payload->funding_feerate_per_kw == 0) {
u32 best_feerate
= payload->funding_feerate_per_kw
= payload->funding_feerate_best;

/* We use the old checks here now, against the base feerate */
if (best_feerate < payload->feerate_our_min) {
msg = towire_dualopend_fail(NULL, tal_fmt(tmpctx,
"feerate_per_kw %u below"
" minimum %u",
best_feerate,
payload->feerate_our_min));
return subd_send_msg(dualopend, take(msg));
}
if (best_feerate > payload->feerate_our_max) {
msg = towire_dualopend_fail(NULL, tal_fmt(tmpctx,
"feerate_per_kw %u above"
" maximum %u",
best_feerate,
payload->feerate_our_max));
return subd_send_msg(dualopend, take(msg));
}
}

channel->cid = payload->channel_id;
channel->opener = REMOTE;
channel->open_attempt = new_channel_open_attempt(channel);
msg = towire_dualopend_got_offer_reply(NULL, payload->accepter_funding,
payload->funding_feerate_per_kw,
msg = towire_dualopend_got_offer_reply(NULL,
payload->accepter_funding,
payload->psbt,
payload->our_shutdown_scriptpubkey);

Expand Down Expand Up @@ -807,26 +773,6 @@ openchannel2_hook_deserialize(struct openchannel2_payload *payload,
&payload->accepter_funding))
fatal("Plugin failed to supply accepter_funding_msat field");

const jsmntok_t *t = json_get_member(buffer, toks, "funding_feerate");
/* If they don't return a feerate, we use the best */
if (!t)
payload->funding_feerate_per_kw = payload->funding_feerate_best;
else {
if (!json_to_number(buffer, t,
&payload->funding_feerate_per_kw))
fatal("Unable to parse 'funding-feerate'");
if (payload->funding_feerate_per_kw
< payload->funding_feerate_min
|| payload->funding_feerate_per_kw
> payload->funding_feerate_max)
/* FIXME: return an error instead of failing? */
fatal("Plugin supplied invalid funding feerate %d."
" Outside valid range %d - %d",
payload->funding_feerate_per_kw,
payload->funding_feerate_min,
payload->funding_feerate_max);
}

if (!payload->psbt &&
!amount_sat_eq(payload->accepter_funding, AMOUNT_SAT(0))) {
/* Gotta give a PSBT if you set the accepter_funding amount */
Expand Down Expand Up @@ -1042,7 +988,7 @@ static struct amount_sat calculate_reserve(struct channel_config *their_config,
{
struct amount_sat reserve, dust_limit;

/* BOLT-fe0351ca2cea3105c4f2eb18c571afca9d21c85b #2
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2
*
* The channel reserve is fixed at 1% of the total channel balance
* rounded down (sum of `funding_satoshis` from `open_channel2`
Expand Down Expand Up @@ -1677,9 +1623,7 @@ static void accepter_got_offer(struct subd *dualopend,
&payload->dust_limit_satoshis,
&payload->max_htlc_value_in_flight_msat,
&payload->htlc_minimum_msat,
&payload->funding_feerate_max,
&payload->funding_feerate_min,
&payload->funding_feerate_best,
&payload->funding_feerate_per_kw,
&payload->commitment_feerate_per_kw,
&payload->to_self_delay,
&payload->max_accepted_htlcs,
Expand All @@ -1695,13 +1639,10 @@ static void accepter_got_offer(struct subd *dualopend,
* min + max feerates. Ideally, the plugin will fail to
* contribute funds if the peer's feerate range is outside of
* this acceptable range, but we delegate that decision to
* the plugin's logic */
* the plugin */
payload->feerate_our_min = feerate_min(dualopend->ld, NULL);
payload->feerate_our_max = feerate_max(dualopend->ld, NULL);

/* Set the inital to feerate to zero, in case there is no plugin */
payload->funding_feerate_per_kw = 0;

tal_add_destructor2(dualopend, openchannel2_remove_dualopend, payload);
plugin_hook_call_openchannel2(dualopend->ld, payload);
}
Expand Down Expand Up @@ -1802,9 +1743,12 @@ static void handle_validate_rbf(struct subd *dualopend,
inputs_present = tal_arr(tmpctx, bool, candidate_psbt->num_inputs);
memset(inputs_present, true, tal_bytelen(inputs_present));

/* Iterate through all previous inflights, confirm
* that at least one input is in all proposed RBFs, including
* this one. */
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* The receiving node: ...
* - MUST fail the negotiation if: ...
* - the transaction does not share a common input with
* all previous funding transactions
*/
list_for_each(&channel->inflights, inflight, list) {
/* Remove every non-matching input from set */
for (size_t i = 0; i < candidate_psbt->num_inputs; i++) {
Expand Down Expand Up @@ -1849,13 +1793,12 @@ static void handle_validate_rbf(struct subd *dualopend,
assert(inflight);
last_fee = psbt_compute_fee(inflight->funding_psbt);

/* BOLT-8edf819f1de3b110653f0b21594a04cfd03d5240 #2:
*
* The receiving node:
* - if this is an RBF attempt:
* - MUST fail the RBF attempt if:
* - the completed transaction's total fees paid
* is less than the last successful funding transaction's fees.
/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
* The receiving node: ...
* - if is an RBF attempt:
* - MUST fail the negotiation if:
* - the transaction's total fees is less than the last
* successfully negotiated transaction's fees
*/
if (!amount_sat_greater(candidate_fee, last_fee)) {
char *errmsg = tal_fmt(tmpctx, "Proposed funding tx fee (%s)"
Expand Down Expand Up @@ -2721,8 +2664,6 @@ static void start_fresh_dualopend(struct peer *peer,
pps, &channel->local_basepoints,
&channel->local_funding_pubkey,
channel->minimum_depth,
feerate_min(peer->ld, NULL),
feerate_max(peer->ld, NULL),
send_msg);
subd_send_msg(channel->owner, take(msg));

Expand Down Expand Up @@ -2794,8 +2735,6 @@ void peer_restart_dualopend(struct peer *peer,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey,
channel->minimum_depth,
feerate_min(peer->ld, NULL),
feerate_max(peer->ld, NULL),
&inflight->funding->txid,
inflight->funding->outnum,
first_inflight->funding->feerate,
Expand Down
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