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channeld: store next per_commit_point.

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This will avoid us having to round-trip to the HSM each time we want it.
For now we still derive it, too, and assert it's correct.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-07-23 11:53:03 +09:30 committed by Christian Decker
parent 909bda938b
commit 8f9408a072
2 changed files with 42 additions and 14 deletions
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52
channeld/channel.c
View File

@ -77,6 +77,9 @@ struct peer {
/* Tolerable amounts for feerate (only relevant for fundee). */
u32 feerate_min, feerate_max;
/* Local next per-commit point. */
struct pubkey next_local_per_commit;
/* Remote's current per-commit point. */
struct pubkey remote_per_commit;
@ -1132,16 +1135,17 @@ static void start_commit_timer(struct peer *peer)
send_commit, peer);
}
static u8 *make_revocation_msg(const struct peer *peer, u64 revoke_index)
static u8 *make_revocation_msg(const struct peer *peer, u64 revoke_index,
struct pubkey *point)
{
struct pubkey oldpoint, point;
struct pubkey oldpoint = peer->next_local_per_commit, old2;
struct secret old_commit_secret;
/* Get secret. */
per_commit_secret(&peer->shaseed, &old_commit_secret, revoke_index);
/* Sanity check that it corresponds to the point we sent. */
pubkey_from_privkey((struct privkey *)&old_commit_secret, &point);
pubkey_from_privkey((struct privkey *)&old_commit_secret, &old2);
if (!per_commit_point(&peer->shaseed, &oldpoint, revoke_index))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Invalid point %"PRIu64" for commit_point",
@ -1151,25 +1155,26 @@ static u8 *make_revocation_msg(const struct peer *peer, u64 revoke_index)
revoke_index,
type_to_string(tmpctx, struct pubkey, &oldpoint));
if (!pubkey_eq(&point, &oldpoint))
if (!pubkey_eq(&old2, &oldpoint))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Invalid secret %s for commit_point",
tal_hexstr(tmpctx, &old_commit_secret,
sizeof(old_commit_secret)));
/* We're revoking N-1th commit, sending N+1th point. */
if (!per_commit_point(&peer->shaseed, &point, revoke_index+2))
if (!per_commit_point(&peer->shaseed, point, revoke_index+2))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Deriving next commit_point");
return towire_revoke_and_ack(peer, &peer->channel_id, &old_commit_secret,
&point);
point);
}
static void send_revocation(struct peer *peer)
{
/* Revoke previous commit. */
u8 *msg = make_revocation_msg(peer, peer->next_index[LOCAL]-1);
/* Revoke previous commit, get new point. */
u8 *msg = make_revocation_msg(peer, peer->next_index[LOCAL]-1,
&peer->next_local_per_commit);
/* From now on we apply changes to the next commitment */
peer->next_index[LOCAL]++;
@ -1296,9 +1301,11 @@ static void handle_peer_commit_sig(struct peer *peer, const u8 *msg)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Deriving per_commit_point for %"PRIu64,
peer->next_index[LOCAL]);
assert(pubkey_eq(&point, &peer->next_local_per_commit));
txs = channel_txs(tmpctx, &htlc_map, &wscripts, peer->channel,
&point, peer->next_index[LOCAL], LOCAL);
&peer->next_local_per_commit,
peer->next_index[LOCAL], LOCAL);
if (!derive_simple_key(&peer->channel->basepoints[REMOTE].htlc,
&point, &remote_htlckey))
@ -1750,8 +1757,9 @@ static void peer_in(struct peer *peer, const u8 *msg)
static void resend_revoke(struct peer *peer)
{
struct pubkey point;
/* Current commit is peer->next_index[LOCAL]-1, revoke prior */
u8 *msg = make_revocation_msg(peer, peer->next_index[LOCAL]-2);
u8 *msg = make_revocation_msg(peer, peer->next_index[LOCAL]-2, &point);
enqueue_peer_msg(peer, take(msg));
}
@ -1948,6 +1956,8 @@ static void peer_reconnect(struct peer *peer)
/* Contains per commit point #1, for first post-opening commit */
per_commit_point(&peer->shaseed, &next_per_commit_point, 1);
assert(pubkey_eq(&next_per_commit_point,
&peer->next_local_per_commit));
msg = towire_funding_locked(NULL,
&peer->channel_id,
&next_per_commit_point);
@ -2091,12 +2101,16 @@ static void handle_funding_locked(struct peer *peer, const u8 *msg)
per_commit_point(&peer->shaseed,
&next_per_commit_point,
peer->next_index[LOCAL]);
assert(pubkey_eq(&next_per_commit_point,
&peer->next_local_per_commit));
status_trace("funding_locked: sending commit index %"PRIu64": %s",
peer->next_index[LOCAL],
type_to_string(tmpctx, struct pubkey, &next_per_commit_point));
type_to_string(tmpctx, struct pubkey,
&peer->next_local_per_commit));
msg = towire_funding_locked(NULL,
&peer->channel_id, &next_per_commit_point);
&peer->channel_id,
&peer->next_local_per_commit);
enqueue_peer_msg(peer, take(msg));
peer->funding_locked[LOCAL] = true;
}
@ -2426,8 +2440,9 @@ static void init_channel(struct peer *peer)
struct added_htlc *htlcs;
bool reconnected;
u8 *funding_signed;
u8 *msg;
const u8 *msg;
u32 feerate_per_kw[NUM_SIDES];
struct secret *unused_secret;
assert(!(fcntl(MASTER_FD, F_GETFL) & O_NONBLOCK));
@ -2500,6 +2515,17 @@ static void init_channel(struct peer *peer)
assert(peer->next_index[LOCAL] > 0);
assert(peer->next_index[REMOTE] > 0);
/* Ask HSM for next per-commitment point: may return old secret, don't
* care */
msg = towire_hsm_get_per_commitment_point(NULL, peer->next_index[LOCAL]);
msg = hsm_req(tmpctx, take(msg));
if (!fromwire_hsm_get_per_commitment_point_reply(tmpctx, msg,
&peer->next_local_per_commit,
&unused_secret))
status_failed(STATUS_FAIL_HSM_IO,
"Malformed per_commitment_point_reply %"PRIu64,
peer->next_index[LOCAL]);
/* channel_id is set from funding txout */
derive_channel_id(&peer->channel_id, &funding_txid, funding_txout);

4
lightningd/channel_control.c
View File

@ -193,7 +193,9 @@ bool peer_start_channeld(struct channel *channel,
hsmfd = hsm_get_client_fd(ld, &channel->peer->id,
channel->dbid,
HSM_CAP_SIGN_GOSSIP | HSM_CAP_ECDH);
HSM_CAP_SIGN_GOSSIP
| HSM_CAP_ECDH
| HSM_CAP_COMMITMENT_POINT);
channel_set_owner(channel,
new_channel_subd(ld,