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lightningd: update spec and remove allowance for final node to receive a fee.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: Now correctly reject "fees" paid when we're the final hop (lightning-rfc#711)
This commit is contained in:
Rusty Russell 2020-01-31 12:08:12 +10:30 • committed by ZmnSCPxj, ZmnSCPxj jxPCSmnZ
parent ff1e1dd487
commit 6450a7e315
2 changed files with 27 additions and 16 deletions
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2
Makefile
View file

@ -15,7 +15,7 @@ CCANDIR := ccan
# Where we keep the BOLT RFCs
BOLTDIR := ../lightning-rfc/
BOLTVERSION := 0fb66ca6ccd935d60a48c80544d4b80d5583422c
BOLTVERSION := 24226302741ec2701571c2036319fdb5554cb07c
-include config.vars

25
lightningd/peer_htlcs.c
View file

@ -173,7 +173,7 @@ static void fail_out_htlc(struct htlc_out *hout, const char *localfail)
* * `amt_to_forward`: The amount, in millisatoshis, to forward to the next
* receiving peer specified within the routing information.
*
* This value amount MUST include the origin node's computed _fee_ for the
* For non-final nodes, this value amount MUST include the origin node's computed _fee_ for the
* receiving peer. When processing an incoming Sphinx packet and the HTLC
* message that it is encapsulated within, if the following inequality
* doesn't hold, then the HTLC should be rejected as it would indicate that
@ -181,12 +181,11 @@ static void fail_out_htlc(struct htlc_out *hout, const char *localfail)
*
* incoming_htlc_amt - fee >= amt_to_forward
*
* Where `fee` is either calculated according to the receiving peer's
* Where `fee` is calculated according to the receiving peer's
* advertised fee schema (as described in [BOLT
* #7](07-routing-gossip.md#htlc-fees)) or is 0, if the processing node is
* the final node.
* #7](07-routing-gossip.md#htlc-fees).
*/
static bool check_amount(struct htlc_in *hin,
static bool check_fwd_amount(struct htlc_in *hin,
struct amount_msat amt_to_forward,
struct amount_msat amt_in_htlc,
struct amount_msat fee)
@ -288,6 +287,19 @@ static void handle_localpay(struct htlc_in *hin,
enum onion_type failcode;
struct lightningd *ld = hin->key.channel->peer->ld;
/* BOLT #4:
*
* For the final node, this value MUST be exactly equal to the
* incoming htlc amount, otherwise the HTLC should be rejected.
*/
if (!amount_msat_eq(amt_to_forward, hin->msat)) {
log_debug(hin->key.channel->log,
"HTLC %"PRIu64" final incorrect amount:"
" %s in, %s expected",
hin->key.id,
type_to_string(tmpctx, struct amount_msat, &hin->msat),
type_to_string(tmpctx, struct amount_msat,
&amt_to_forward));
/* BOLT #4:
*
* 1. type: 19 (`final_incorrect_htlc_amount`)
@ -296,7 +308,6 @@ static void handle_localpay(struct htlc_in *hin,
*
* The amount in the HTLC doesn't match the value in the onion.
*/
if (!check_amount(hin, amt_to_forward, hin->msat, AMOUNT_MSAT(0))) {
failcode = WIRE_FINAL_INCORRECT_HTLC_AMOUNT;
goto fail;
}
@ -524,7 +535,7 @@ static void forward_htlc(struct htlc_in *hin,
failcode = WIRE_FEE_INSUFFICIENT;
goto fail;
}
if (!check_amount(hin, amt_to_forward, hin->msat, fee)) {
if (!check_fwd_amount(hin, amt_to_forward, hin->msat, fee)) {
failcode = WIRE_FEE_INSUFFICIENT;
goto fail;
}