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channeld: allow creation of the three BADONION errors.

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We use a dummy sha256 value at the moment.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-01-08 11:23:13 +10:30 • committed by Christian Decker
parent 554c3ec7e5
commit 85ce1ff1c8
1 changed files with 22 additions and 6 deletions
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28
channeld/channeld.c
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@ -805,7 +805,8 @@ static u8 *make_failmsg(const tal_t *ctx,
struct peer *peer,
const struct htlc *htlc,
enum onion_type failcode,
const struct short_channel_id *scid)
const struct short_channel_id *scid,
const struct sha256 *sha256)
{
u8 *msg, *channel_update = NULL;
u32 cltv_expiry = abs_locktime_to_blocks(&htlc->expiry);
@ -877,9 +878,14 @@ static u8 *make_failmsg(const tal_t *ctx,
msg = towire_final_incorrect_htlc_amount(ctx, htlc->msatoshi);
goto done;
case WIRE_INVALID_ONION_VERSION:
msg = towire_invalid_onion_version(ctx, sha256);
goto done;
case WIRE_INVALID_ONION_HMAC:
msg = towire_invalid_onion_hmac(ctx, sha256);
goto done;
case WIRE_INVALID_ONION_KEY:
break;
msg = towire_invalid_onion_key(ctx, sha256);
goto done;
}
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Asked to create failmsg %u (%s)",
@ -1783,20 +1789,30 @@ static void send_fail_or_fulfill(struct peer *peer, const struct htlc *h)
{
u8 *msg;
if (h->failcode & BADONION) {
/* Malformed: use special reply since we can't onion. */
/* Note that if h->shared_secret is NULL, it means that we knew
* this HTLC was invalid, but we still needed to hand it to lightningd
* for the db, etc. So in that case, we use our own saved failcode.
*
* This also lets us distinguish between "we can't decode onion" and
* "next hop said it can't decode onion". That second case is the
* only case where we use a failcode for a non-local error. */
/* Malformed: use special reply since we can't onion. */
if (!h->shared_secret) {
struct sha256 sha256_of_onion;
sha256(&sha256_of_onion, h->routing, tal_count(h->routing));
msg = towire_update_fail_malformed_htlc(NULL, &peer->channel_id,
h->id, &sha256_of_onion,
h->failcode);
h->why_bad_onion);
} else if (h->failcode || h->fail) {
const u8 *onion;
if (h->failcode) {
/* FIXME: we need sha256_of_onion from peer. */
struct sha256 dummy;
memset(&dummy, 0, sizeof(dummy));
/* Local failure, make a message. */
u8 *failmsg = make_failmsg(tmpctx, peer, h, h->failcode,
h->failed_scid);
h->failed_scid, &dummy);
onion = create_onionreply(tmpctx, h->shared_secret,
failmsg);
} else /* Remote failure, just forward. */