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common: update to latest route-blinding spec.

Browse Source 
```
make check-source-bolt CHECK_BOLT_PREFIX="--prefix=BOLT-route-blinding" BOLTVERSION=guilt/offers
```

Other than textual changes, this does:

1. Ensures we put total_amount_msat in onion final hop (reported by @t-bast).
2. Require that they put total_amount_msat in onion final hop.
3. Return `invalid_onion_blinding` exactly as defined by the spec (i.e. less
   aggressive when we're the final hop) (also reported by @t-bast, but I already
   knew).

See: #5823
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-EXPERIMENTAL: `offers` breaking blinded payments change (total_amount_sat required, Eclair compat)
This commit is contained in:
Rusty Russell
2023-01-12 14:23:38 +10:30
parent d5c19b23d8
commit e9eb5f493b
9 changed files with 46 additions and 21 deletions
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9
common/onion_decode.c
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@@ -102,8 +102,8 @@ static bool handle_blinded_terminal(struct onion_payload *p,
}
/* BOLT-route-blinding #4:
* - MUST return an error if `amt_to_forward` or
* `outgoing_cltv_value` are not present.
* - MUST return an error if `amt_to_forward`, `outgoing_cltv_value`
* or `total_amount_msat` are not present.
* - MUST return an error if `amt_to_forward` is below what it expects
* for the payment.
*/
@@ -117,6 +117,11 @@ static bool handle_blinded_terminal(struct onion_payload *p,
return false;
}
if (!tlv->total_amount_msat) {
*failtlvtype = TLV_TLV_PAYLOAD_TOTAL_AMOUNT_MSAT;
return false;
}
p->amt_to_forward = amount_msat(*tlv->amt_to_forward);
p->outgoing_cltv = *tlv->outgoing_cltv_value;