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lightningd: always use an onionreply for locally generated incoming HTLC errors (unless BADONION).

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This cleans up the "local failure" callers for incoming HTLCs to hand
an onionreply instead of making us generate it from the code inside
make_failmsg.

(The db path still needs make_failmsg, so that's next).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-deprecated: Plugins: htlc_accepted_hook "failure_code" only handles simple cases now, use "failure_message".
This commit is contained in:
Rusty Russell 2020-02-21 15:40:02 +10:30
parent 590b2db88e
commit bbc7a79542
3 changed files with 109 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
lightningd/pay.c
View File

@ -731,7 +731,8 @@ static bool should_use_tlv(enum route_hop_style style)
abort();
}
static enum onion_type send_onion(struct lightningd *ld,
/* Returns failmsg on failure, tallocated off ctx */
static const u8 *send_onion(const tal_t *ctx, struct lightningd *ld,
const struct onionpacket *packet,
const struct route_hop *first_hop,
const struct sha256 *payment_hash,
@ -743,7 +744,7 @@ static enum onion_type send_onion(struct lightningd *ld,
unsigned int base_expiry;
base_expiry = get_block_height(ld->topology) + 1;
onion = serialize_onionpacket(tmpctx, packet);
return send_htlc_out(channel, first_hop->amount,
return send_htlc_out(ctx, channel, first_hop->amount,
base_expiry + first_hop->delay,
payment_hash, partid, onion, NULL, hout);
}
@ -768,7 +769,7 @@ send_payment_core(struct lightningd *ld,
{
const struct wallet_payment **payments, *old_payment = NULL;
struct channel *channel;
enum onion_type failcode;
const u8 *failmsg;
struct htlc_out *hout;
struct routing_failure *fail;
struct amount_msat msat_already_pending = AMOUNT_MSAT(0);
@ -885,12 +886,12 @@ send_payment_core(struct lightningd *ld,
return command_failed(cmd, data);
}
failcode = send_onion(ld, packet, first_hop, rhash, partid,
failmsg = send_onion(tmpctx, ld, packet, first_hop, rhash, partid,
channel, &hout);
if (failcode) {
if (failmsg) {
fail = immediate_routing_failure(cmd, ld,
failcode,
fromwire_peektype(failmsg),
&first_hop->channel_id,
&channel->peer->id);

148
lightningd/peer_htlcs.c
View File

@ -221,18 +221,11 @@ static struct failed_htlc *mk_failed_htlc(const tal_t *ctx,
}
static void fail_in_htlc(struct htlc_in *hin,
enum onion_type failcode,
const struct onionreply *failonion,
const u8 *channel_update)
const struct onionreply *failonion TAKES)
{
struct failed_htlc *failed_htlc;
struct failed_htlc failed_htlc;
assert(!hin->preimage);
assert(failcode || failonion);
/* These callers should be using local_fail_in_htlc_badonion! */
assert(!(failcode & BADONION));
hin->failcode = failcode;
if (failonion)
hin->failonion = dup_onionreply(hin, failonion);
/* We update state now to signal it's in progress, for persistence. */
@ -247,10 +240,13 @@ static void fail_in_htlc(struct htlc_in *hin,
if (channel_on_chain(hin->key.channel))
return;
failed_htlc = mk_failed_htlc(tmpctx, hin, failcode, failonion,
channel_update);
failed_htlc.id = hin->key.id;
failed_htlc.sha256_of_onion = NULL;
/* Wrap onion error */
failed_htlc.onion
= wrap_onionreply(tmpctx, hin->shared_secret, hin->failonion);
subd_send_msg(hin->key.channel->owner,
take(towire_channel_fail_htlc(NULL, failed_htlc)));
take(towire_channel_fail_htlc(NULL, &failed_htlc)));
}
/* Immediately fail HTLC with a BADONION code */
@ -286,21 +282,16 @@ static void local_fail_in_htlc_badonion(struct htlc_in *hin,
}
/* This is used for cases where we can immediately fail the HTLC. */
static void local_fail_htlc(struct htlc_in *hin, enum onion_type failcode,
const u8 *out_channel_update)
{
log_info(hin->key.channel->log, "failed htlc %"PRIu64" code 0x%04x (%s)",
hin->key.id, failcode, onion_type_name(failcode));
fail_in_htlc(hin, failcode, NULL, out_channel_update);
}
void local_fail_in_htlc(struct htlc_in *hin, const u8 *failmsg TAKES)
{
/* FIXME: pass failmsg through! */
local_fail_htlc(hin, fromwire_peektype(failmsg), NULL);
struct onionreply *failonion = create_onionreply(NULL,
hin->shared_secret,
failmsg);
if (taken(failmsg))
tal_free(failmsg);
fail_in_htlc(hin, take(failonion));
}
/* Helper to create (common) WIRE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS */
@ -331,8 +322,7 @@ static void fail_out_htlc(struct htlc_out *hout, const char *localfail)
failonion = create_onionreply(hout,
hout->in->shared_secret,
hout->failmsg);
fail_in_htlc(hout->in, 0, failonion,
hout->key.channel->stripped_update);
fail_in_htlc(hout->in, failonion);
}
}
@ -573,8 +563,7 @@ static void rcvd_htlc_reply(struct subd *subd, const u8 *msg, const int *fds UNU
failonion = create_onionreply(hout,
hout->in->shared_secret,
hout->failmsg);
fail_in_htlc(hout->in, 0, failonion,
hout->key.channel->stripped_update);
fail_in_htlc(hout->in, failonion);
/* here we haven't called connect_htlc_out(),
* so set htlc field with NULL */
@ -622,7 +611,9 @@ static void htlc_offer_timeout(struct channel *channel)
"Adding HTLC timed out: killed connection");
}
enum onion_type send_htlc_out(struct channel *out,
/* Returns failmsg, or NULL on success. */
const u8 *send_htlc_out(const tal_t *ctx,
struct channel *out,
struct amount_msat amount, u32 cltv,
const struct sha256 *payment_hash,
u64 partid,
@ -637,19 +628,21 @@ enum onion_type send_htlc_out(struct channel *out,
if (!channel_can_add_htlc(out)) {
log_info(out->log, "Attempt to send HTLC but not ready (%s)",
channel_state_name(out));
return WIRE_UNKNOWN_NEXT_PEER;
return towire_unknown_next_peer(ctx);
}
if (!out->owner) {
log_info(out->log, "Attempt to send HTLC but unowned (%s)",
channel_state_name(out));
return WIRE_TEMPORARY_CHANNEL_FAILURE;
return towire_temporary_channel_failure(ctx,
out->stripped_update);
}
if (!topology_synced(out->peer->ld->topology)) {
log_info(out->log, "Attempt to send HTLC but still syncing"
" with bitcoin network");
return WIRE_TEMPORARY_CHANNEL_FAILURE;
return towire_temporary_channel_failure(ctx,
out->stripped_update);
}
/* Make peer's daemon own it, catch if it dies. */
@ -669,7 +662,7 @@ enum onion_type send_htlc_out(struct channel *out,
subd_req(out->peer->ld, out->owner, take(msg), -1, 0, rcvd_htlc_reply,
*houtp);
return 0;
return NULL;
}
static void forward_htlc(struct htlc_in *hin,
@ -680,7 +673,7 @@ static void forward_htlc(struct htlc_in *hin,
const u8 *stripped_update TAKES,
const u8 next_onion[TOTAL_PACKET_SIZE])
{
enum onion_type failcode;
const u8 *failmsg;
struct amount_msat fee;
struct lightningd *ld = hin->key.channel->peer->ld;
struct channel *next = active_channel_by_id(ld, next_hop, NULL);
@ -688,11 +681,11 @@ static void forward_htlc(struct htlc_in *hin,
/* Unknown peer, or peer not ready. */
if (!next || !next->scid) {
local_fail_htlc(hin, WIRE_UNKNOWN_NEXT_PEER, NULL);
local_fail_in_htlc(hin, take(towire_unknown_next_peer(NULL)));
wallet_forwarded_payment_add(hin->key.channel->peer->ld->wallet,
hin, next ? next->scid : NULL, NULL,
FORWARD_LOCAL_FAILED,
hin->failcode);
WIRE_UNKNOWN_NEXT_PEER);
if (taken(stripped_update))
tal_free(stripped_update);
return;
@ -716,24 +709,27 @@ static void forward_htlc(struct htlc_in *hin,
log_broken(ld->log, "Fee overflow forwarding %s!",
type_to_string(tmpctx, struct amount_msat,
&amt_to_forward));
failcode = WIRE_FEE_INSUFFICIENT;
failmsg = towire_fee_insufficient(tmpctx, hin->msat,
next->stripped_update);
goto fail;
}
if (!check_fwd_amount(hin, amt_to_forward, hin->msat, fee)) {
failcode = WIRE_FEE_INSUFFICIENT;
failmsg = towire_fee_insufficient(tmpctx, hin->msat,
next->stripped_update);
goto fail;
}
if (!check_cltv(hin, cltv_expiry, outgoing_cltv_value,
ld->config.cltv_expiry_delta)) {
failcode = WIRE_INCORRECT_CLTV_EXPIRY;
failmsg = towire_incorrect_cltv_expiry(tmpctx, cltv_expiry,
next->stripped_update);
goto fail;
}
if (amount_msat_greater(amt_to_forward,
chainparams->max_payment)) {
/* ENOWUMBO! */
failcode = WIRE_REQUIRED_CHANNEL_FEATURE_MISSING;
failmsg = towire_required_channel_feature_missing(tmpctx);
goto fail;
}
@ -751,7 +747,8 @@ static void forward_htlc(struct htlc_in *hin,
"Expiry cltv %u too close to current %u",
outgoing_cltv_value,
get_block_height(ld->topology));
failcode = WIRE_EXPIRY_TOO_SOON;
failmsg = towire_expiry_too_soon(tmpctx,
next->stripped_update);
goto fail;
}
@ -767,22 +764,22 @@ static void forward_htlc(struct htlc_in *hin,
outgoing_cltv_value,
get_block_height(ld->topology),
ld->config.locktime_max);
failcode = WIRE_EXPIRY_TOO_FAR;
failmsg = towire_expiry_too_far(tmpctx);
goto fail;
}
failcode = send_htlc_out(next, amt_to_forward,
failmsg = send_htlc_out(tmpctx, next, amt_to_forward,
outgoing_cltv_value, &hin->payment_hash,
0, next_onion, hin, &hout);
if (!failcode)
if (!failmsg)
return;
fail:
local_fail_htlc(hin, failcode, next->stripped_update);
local_fail_in_htlc(hin, failmsg);
wallet_forwarded_payment_add(ld->wallet,
hin, next->scid, hout,
FORWARD_LOCAL_FAILED,
hin->failcode);
fromwire_peektype(failmsg));
}
/* Temporary information, while we resolve the next hop */
@ -814,7 +811,7 @@ static void channel_resolve_reply(struct subd *gossip, const u8 *msg,
}
if (!peer_id) {
local_fail_htlc(gr->hin, WIRE_UNKNOWN_NEXT_PEER, NULL);
local_fail_in_htlc(gr->hin, take(towire_unknown_next_peer(NULL)));
wallet_forwarded_payment_add(gr->hin->key.channel->peer->ld->wallet,
gr->hin, &gr->next_channel, NULL,
FORWARD_LOCAL_FAILED,
@ -993,6 +990,7 @@ htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request,
u8 *req;
enum htlc_accepted_result result;
enum onion_type failure_code;
const u8 *failmsg;
u8 *channel_update;
result = htlc_accepted_hook_deserialize(buffer, toks, &payment_preimage, &failure_code, &channel_update);
@ -1001,8 +999,8 @@ htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request,
/* *Now* we barf if it failed to decode */
if (!request->payload) {
log_debug(channel->log, "Failing HTLC because of an invalid payload");
failure_code = WIRE_INVALID_ONION_PAYLOAD;
fail_in_htlc(hin, failure_code, NULL, NULL);
local_fail_in_htlc_badonion(hin,
WIRE_INVALID_ONION_PAYLOAD);
} else if (rs->nextcase == ONION_FORWARD) {
struct gossip_resolve *gr = tal(ld, struct gossip_resolve);
@ -1028,21 +1026,41 @@ htlc_accepted_hook_callback(struct htlc_accepted_hook_payload *request,
case htlc_accepted_fail:
log_debug(channel->log,
"Failing incoming HTLC as instructed by plugin hook");
if (failure_code & UPDATE) {
if (rs->nextcase == ONION_END) {
/* FIXME: Deprecate failure_code in favor of failure_message! */
/* We only handle the simplest cases here */
switch (failure_code) {
case WIRE_INVALID_REALM:
failmsg = towire_invalid_realm(NULL);
break;
case WIRE_TEMPORARY_NODE_FAILURE:
failmsg = towire_temporary_node_failure(NULL);
break;
case WIRE_PERMANENT_NODE_FAILURE:
failmsg = towire_permanent_node_failure(NULL);
break;
case WIRE_REQUIRED_NODE_FEATURE_MISSING:
failmsg = towire_required_node_feature_missing(NULL);
break;
case WIRE_CHANNEL_DISABLED:
failmsg = towire_channel_disabled(NULL);
break;
case WIRE_PERMANENT_CHANNEL_FAILURE:
failmsg = towire_permanent_channel_failure(NULL);
break;
case WIRE_REQUIRED_CHANNEL_FEATURE_MISSING:
failmsg = towire_required_channel_feature_missing(NULL);
break;
case WIRE_UNKNOWN_NEXT_PEER:
failmsg = towire_unknown_next_peer(NULL);
break;
default:
log_broken(channel->log,
"htlc_acccepted hook: Can't return failure %u on last hop!",
"htlc_accepted_hook plugin returned %u,"
" turning to WIRE_TEMPORARY_NODE_FAILURE",
failure_code);
failure_code = WIRE_TEMPORARY_NODE_FAILURE;
} else if (!request->payload) {
log_broken(channel->log,
"htlc_acccepted hook: Can't return failure %u on undecodable onion!",
failure_code);
failure_code = WIRE_TEMPORARY_NODE_FAILURE;
failmsg = towire_temporary_node_failure(NULL);
}
}
/* FIXME: Supply update in this case! */
fail_in_htlc(hin, failure_code, NULL, NULL);
local_fail_in_htlc(hin, take(failmsg));
break;
case htlc_accepted_resolve:
fulfill_htlc(hin, &payment_preimage);
@ -1362,8 +1380,8 @@ void onchain_failed_our_htlc(const struct channel *channel,
payment_failed(ld, hout, localfail);
tal_free(localfail);
} else if (hout->in) {
local_fail_htlc(hout->in, WIRE_PERMANENT_CHANNEL_FAILURE,
hout->key.channel->stripped_update);
local_fail_in_htlc(hout->in,
take(towire_permanent_channel_failure(NULL)));
wallet_forwarded_payment_add(hout->key.channel->peer->ld->wallet,
hout->in, channel->scid, hout,
FORWARD_LOCAL_FAILED,
@ -1998,9 +2016,7 @@ void peer_got_revoke(struct channel *channel, const u8 *msg)
} else if (failmsgs[i]) {
hin = find_htlc_in(&ld->htlcs_in, channel,
changed[i].id);
/* FIXME: Pass through the failmsg direcly! */
local_fail_htlc(hin, fromwire_peektype(failmsgs[i]),
NULL);
local_fail_in_htlc(hin, failmsgs[i]);
} else
continue;
@ -2365,7 +2381,7 @@ void htlcs_resubmit(struct lightningd *ld,
if (!peer_accepted_htlc(tmpctx, hin->key.channel, hin->key.id,
true, &badonion, &failmsg)) {
if (failmsg)
local_fail_htlc(hin, fromwire_peektype(failmsg), NULL);
local_fail_in_htlc(hin, failmsg);
else
local_fail_in_htlc_badonion(hin, badonion);
}

4
lightningd/peer_htlcs.h
View File

@ -47,7 +47,9 @@ void peer_got_revoke(struct channel *channel, const u8 *msg);
void update_per_commit_point(struct channel *channel,
const struct pubkey *per_commitment_point);
enum onion_type send_htlc_out(struct channel *out,
/* Returns NULL on success, otherwise failmsg */
const u8 *send_htlc_out(const tal_t *ctx,
struct channel *out,
struct amount_msat amount, u32 cltv,
const struct sha256 *payment_hash,
u64 partid,