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common/sphinx: handle decoding of TLV payload.

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We add routines to decode the expected fields from both legacy and tlv
hop formats.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-11-14 10:44:53 +10:30
committed by Christian Decker
parent a76518a029
commit b7bbccd6fa
5 changed files with 168 additions and 2 deletions
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15
common/sphinx.h
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@@ -81,6 +81,7 @@ struct route_step {
enum sphinx_payload_type type;
union {
struct hop_data_legacy v0;
struct tlv_tlv_payload *tlv;
} payload;
u8 *raw_payload;
};
@@ -230,4 +231,18 @@ void sphinx_add_v0_hop(struct sphinx_path *path, const struct pubkey *pubkey,
void sphinx_add_raw_hop(struct sphinx_path *path, const struct pubkey *pubkey,
enum sphinx_payload_type type, const u8 *payload);
/**
* Helper to extract fields from ONION_END.
*/
bool route_step_decode_end(const struct route_step *rs,
struct amount_msat *amt_forward,
u32 *outgoing_cltv);
/**
* Helper to extract fields from ONION_FORWARD.
*/
bool route_step_decode_forward(const struct route_step *rs,
struct amount_msat *amt_forward,
u32 *outgoing_cltv,
struct short_channel_id *scid);
#endif /* LIGHTNING_COMMON_SPHINX_H */