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daemon/sphinx: support modern v0 hop payload.

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This just means we put the outgoing_cltv_value where we used to put zeroes.
The old daemon simply ignores this, but the new one should check it as per
BOLT 4.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2017-04-01 21:28:30 +10:30
parent fed25cc540
commit 8a84e961ed
4 changed files with 27 additions and 9 deletions
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14
daemon/sphinx.h
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@@ -35,10 +35,20 @@ enum route_next_case {
ONION_FORWARD = 1,
};
/* BOLT #4:
*
* The format of the per-hop-payload for a version 0 packet is as follows:
```
+----------------+--------------------------+-------------------------------+--------------------------------------------+
| realm (1 byte) | amt_to_forward (8 bytes) | outgoing_cltv_value (4 bytes) | unused_with_v0_version_on_header (7 bytes) |
+----------------+--------------------------+-------------------------------+--------------------------------------------+
```
*/
struct hoppayload {
u8 realm;
u64 amount;
u8 remainder[11];
u64 amt_to_forward;
u32 outgoing_cltv_value;
u8 unused_with_v0_version_on_header[7];
};
struct route_step {