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channeld: update to send next commitment number on connection reestablish.

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As per latest BOLT revision.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-06-27 12:25:06 +09:30 • committed by Christian Decker
parent 05b9e0d538
commit 1679f2da06
2 changed files with 59 additions and 51 deletions
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106
lightningd/channel/channel.c
View file

@ -1381,9 +1381,9 @@ static void resend_commitment(struct peer *peer, const struct changed_htlc *last
/* BOLT #2:
*
* If `commitments_received` is one less than the commitment number of
* the last `commitment_signed` message the receiving node has sent,
* it MUST reuse the same commitment number for its next
* If `next_local_commitment_number` is equal to the commitment number
* of the last `commitment_signed` message the receiving node has
* sent, it MUST reuse the same commitment number for its next
* `commitment_signed`
*/
/* In our case, we consider ourselves already committed to this, so
@ -1430,8 +1430,8 @@ static void resend_commitment(struct peer *peer, const struct changed_htlc *last
static void peer_reconnect(struct peer *peer)
{
struct channel_id channel_id;
u64 last_commitidx_sent, last_revokeidx_sent;
u64 commitments_received, revocations_received;
/* Note: BOLT #2 uses these names, which are sender-relative! */
u64 next_local_commitment_number, next_remote_revocation_number;
bool retransmit_revoke_and_ack;
struct htlc_map_iter it;
const struct htlc *htlc;
@ -1444,15 +1444,16 @@ static void peer_reconnect(struct peer *peer)
* `channel_reestablish` message before sending any other messages for
* that channel.
*
* The sending node MUST set `commitments_received` to the commitment
* number of the last `commitment_signed` it received, and MUST set
* `revocations_received` to one greater than the commitment number of
* the last `revoke_and_ack` message received, or 0 if none have been
* received.
* The sending node MUST set `next_local_commitment_number` to the
* commitment number of the next `commitment_signed` it expects to
* receive, and MUST set `next_remote_revocation_number` to the
* commitment number of the next `revoke_and_ack` message it expects
* to receive.
*/
/* Note: if we're working on commit #7, we've seen commitsig for #6 */
/* Note: our commit_index is the current one we're working on, ie.
* the next one we expect a sig for. */
msg = towire_channel_reestablish(peer, &peer->channel_id,
peer->commit_index[LOCAL] - 1,
peer->commit_index[LOCAL],
peer->revocations_received);
if (!sync_crypto_write(&peer->pcs.cs, PEER_FD, take(msg)))
status_failed(WIRE_CHANNEL_PEER_WRITE_FAILED,
@ -1471,14 +1472,18 @@ again:
}
if (!fromwire_channel_reestablish(msg, NULL, &channel_id,
&commitments_received,
&revocations_received)) {
&next_local_commitment_number,
&next_remote_revocation_number)) {
status_failed(WIRE_CHANNEL_PEER_READ_FAILED,
"bad reestablish msg: %s %s",
wire_type_name(fromwire_peektype(msg)),
tal_hex(msg, msg));
}
status_trace("Got reestablish commit=%"PRIu64" revoke=%"PRIu64,
next_local_commitment_number,
next_remote_revocation_number);
/* BOLT #2:
*
* On reconnection, a node MUST retransmit `funding_locked` unless it
@ -1497,38 +1502,35 @@ again:
msg_enqueue(&peer->peer_out, take(msg));
}
/* If we're working on commit #1 now, we sent #0. */
last_commitidx_sent = peer->commit_index[REMOTE] - 1;
assert(peer->commit_index[REMOTE] > 0);
/* Can be -1, but in that case nothing to re-transmit. */
last_revokeidx_sent = peer->commit_index[LOCAL] - 2;
assert(peer->commit_index[LOCAL] > 0);
/* Note: commit_index is the index of the current commit we're working
* on, but BOLT #2 refers to the *last* commit index, so we -1 where
* required. */
/* BOLT #2:
*
* If `revocations_received` is equal to the commitment number of the
* last `revoke_and_ack` the receiving node has sent, it MUST re-send
* the final `revoke_and_ack`, otherwise if `revocations_received` is
* not equal to one greater than the commitment number of the last
* `revoke_and_ack`, the receiving node has sent, it SHOULD fail the
* channel.
* If `next_remote_revocation_number` is equal to the commitment
* number of the last `revoke_and_ack` the receiving node has sent, it
* MUST re-send the `revoke_and_ack`, otherwise if
* `next_remote_revocation_number` is not equal to one greater than
* the commitment number of the last `revoke_and_ack` the receiving
* node has sent (or equal to zero if none have been sent), it SHOULD
* fail the channel.
*/
/* If we're working on commit #2 now, we've send a revocation for commit
* #0, but beware commit #1 case, where no revoke has been sent! */
if (revocations_received == last_revokeidx_sent) {
if (last_revokeidx_sent == (u64)-1) {
if (next_remote_revocation_number == peer->commit_index[LOCAL] - 2) {
/* Don't try to retransmit revocation index -1! */
if (peer->commit_index[LOCAL] < 2) {
status_failed(WIRE_CHANNEL_PEER_READ_FAILED,
"bad reestablish revocations_received: %"
"bad reestablish revocation_number: %"
PRIu64,
revocations_received);
next_remote_revocation_number);
}
retransmit_revoke_and_ack = true;
} else if (revocations_received != last_revokeidx_sent + 1) {
} else if (next_remote_revocation_number != peer->commit_index[LOCAL] - 1) {
status_failed(WIRE_CHANNEL_PEER_READ_FAILED,
"bad reestablish revocations_received: %"PRIu64
"bad reestablish revocation_number: %"PRIu64
" vs %"PRIu64,
revocations_received, last_revokeidx_sent);
next_remote_revocation_number,
peer->commit_index[LOCAL]);
} else
retransmit_revoke_and_ack = false;
@ -1539,30 +1541,36 @@ again:
/* BOLT #2:
*
* If `commitments_received` is one less than the commitment number of
* the last `commitment_signed` message the receiving node has sent,
* it MUST reuse the same commitment number for its next
* `commitment_signed`, otherwise if `commitments_received` is not
* equal to the commitment number of the last `commitment_signed`
* message the receiving node has sent, it SHOULD fail the channel.
* If `next_local_commitment_number` is equal to the commitment number
* of the last `commitment_signed` message the receiving node has
* sent, it MUST reuse the same commitment number for its next
* `commitment_signed`
*/
if (commitments_received == last_commitidx_sent - 1) {
if (next_local_commitment_number == peer->commit_index[REMOTE] - 1) {
/* We completed opening, we don't re-transmit that one! */
if (last_commitidx_sent == 0)
if (next_local_commitment_number == 0)
status_failed(WIRE_CHANNEL_PEER_READ_FAILED,
"bad reestablish commitments_received: %"
"bad reestablish commitment_number: %"
PRIu64,
commitments_received);
next_local_commitment_number);
resend_commitment(peer, peer->last_sent_commit);
} else if (commitments_received != last_commitidx_sent)
/* BOLT #2:
*
* ... otherwise if `next_local_commitment_number` is not one greater
* than the commitment number of the last `commitment_signed` message
* the receiving node has sent, it SHOULD fail the channel.
*/
} else if (next_local_commitment_number != peer->commit_index[REMOTE])
peer_failed(PEER_FD,
&peer->pcs.cs,
&peer->channel_id,
WIRE_CHANNEL_PEER_BAD_MESSAGE,
"Peer sent invalid commitments_received %"PRIu64
"bad reestablish commitment_number: %"PRIu64
" vs %"PRIu64,
commitments_received, last_commitidx_sent);
next_local_commitment_number,
peer->commit_index[REMOTE]);
/* This covers the case where we sent revoke after commit. */
if (retransmit_revoke_and_ack && peer->last_was_revoke)

4
wire/gen_peer_wire_csv
View file

@ -100,8 +100,8 @@ update_fee,0,channel_id,32
update_fee,32,feerate_per_kw,4
channel_reestablish,136
channel_reestablish,0,channel_id,32
channel_reestablish,32,commitments_received,8
channel_reestablish,40,revocations_received,8
channel_reestablish,32,next_local_commitment_number,8
channel_reestablish,40,next_remote_revocation_number,8
announcement_signatures,259
announcement_signatures,0,channel_id,32
announcement_signatures,32,short_channel_id,8