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channeld: handle reestablish from previous release with EXPERIMENTAL_FEATURES.

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We switched channel_types from optional to compulsory bits in
cb22015b2a.

The result is infinite reconnects against older nodes; we reject what
they send, and they reject what we send.

The simplest fix is to neither send nor receive the (optional!) tlvs
unless we both advertize option_quiesce, which we now do.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-EXPERIMENTAL: channel_upgrade draft upgraded: cannot upgrade channels until peers also upgrade.
This commit is contained in:
Rusty Russell 2021-10-08 10:10:33 +10:30 • committed by Christian Decker
parent 7157a92ea6
commit 1534216aad
1 changed files with 58 additions and 6 deletions
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64
channeld/channeld.c
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@ -2664,6 +2664,22 @@ static u8 *to_bytearr(const tal_t *ctx,
ret = tal_dup_talarr(ctx, u8, channel_type->features);
return ret;
}
/* This is the no-tlvs version, where we can't handle old tlvs */
static bool fromwire_channel_reestablish_notlvs(const void *p, struct channel_id *channel_id, u64 *next_commitment_number, u64 *next_revocation_number, struct secret *your_last_per_commitment_secret, struct pubkey *my_current_per_commitment_point)
{
const u8 *cursor = p;
size_t plen = tal_count(p);
if (fromwire_u16(&cursor, &plen) != WIRE_CHANNEL_REESTABLISH)
return false;
fromwire_channel_id(&cursor, &plen, channel_id);
*next_commitment_number = fromwire_u64(&cursor, &plen);
*next_revocation_number = fromwire_u64(&cursor, &plen);
fromwire_secret(&cursor, &plen, your_last_per_commitment_secret);
fromwire_pubkey(&cursor, &plen, my_current_per_commitment_point);
return cursor != NULL;
}
#endif
static void peer_reconnect(struct peer *peer,
@ -2702,6 +2718,14 @@ static void peer_reconnect(struct peer *peer,
#if EXPERIMENTAL_FEATURES
/* Subtle: we free tmpctx below as we loop, so tal off peer */
send_tlvs = tlv_channel_reestablish_tlvs_new(peer);
/* FIXME: v0.10.1 would send a different tlv set, due to older spec.
* That did *not* offer OPT_QUIESCE, so in that case don't send tlvs. */
if (!feature_negotiated(peer->our_features,
peer->their_features,
OPT_QUIESCE))
goto skip_tlvs;
/* BOLT-upgrade_protocol #2:
* A node sending `channel_reestablish`, if it supports upgrading channels:
* - MUST set `next_to_send` the commitment number of the next
@ -2735,6 +2759,8 @@ static void peer_reconnect(struct peer *peer,
take(channel_upgradable_type(NULL,
peer->channel)));
}
skip_tlvs:
#endif
/* BOLT #2:
@ -2819,24 +2845,50 @@ static void peer_reconnect(struct peer *peer,
got_reestablish:
#if EXPERIMENTAL_FEATURES
recv_tlvs = tlv_channel_reestablish_tlvs_new(tmpctx);
#endif
/* FIXME: v0.10.1 would send a different tlv set, due to older spec.
* That did *not* offer OPT_QUIESCE, so in that case ignore tlvs. */
if (!feature_negotiated(peer->our_features,
peer->their_features,
OPT_QUIESCE)) {
if (!fromwire_channel_reestablish_notlvs(msg,
&channel_id,
&next_commitment_number,
&next_revocation_number,
&last_local_per_commitment_secret,
&remote_current_per_commitment_point))
peer_failed_warn(peer->pps,
&peer->channel_id,
"bad reestablish msg: %s %s",
peer_wire_name(fromwire_peektype(msg)),
tal_hex(msg, msg));
} else if (!fromwire_channel_reestablish(msg,
&channel_id,
&next_commitment_number,
&next_revocation_number,
&last_local_per_commitment_secret,
&remote_current_per_commitment_point,
recv_tlvs)) {
peer_failed_warn(peer->pps,
&peer->channel_id,
"bad reestablish msg: %s %s",
peer_wire_name(fromwire_peektype(msg)),
tal_hex(msg, msg));
}
#else /* !EXPERIMENTAL_FEATURES */
if (!fromwire_channel_reestablish(msg,
&channel_id,
&next_commitment_number,
&next_revocation_number,
&last_local_per_commitment_secret,
&remote_current_per_commitment_point
#if EXPERIMENTAL_FEATURES
, recv_tlvs
#endif
)) {
&remote_current_per_commitment_point)) {
peer_failed_warn(peer->pps,
&peer->channel_id,
"bad reestablish msg: %s %s",
peer_wire_name(fromwire_peektype(msg)),
tal_hex(msg, msg));
}
#endif
if (!channel_id_eq(&channel_id, &peer->channel_id)) {
peer_failed_err(peer->pps,