Locktime *abs_locktime_to_proto(const tal_t *ctx,
const struct abs_locktime *locktime)
{
Locktime *l = tal(ctx, Locktime);
locktime__init(l);
if (abs_locktime_is_seconds(locktime)) {
l->locktime_case = LOCKTIME__LOCKTIME_SECONDS;
l->seconds = abs_locktime_to_seconds(locktime);
} else {
l->locktime_case = LOCKTIME__LOCKTIME_BLOCKS;
l->blocks = abs_locktime_to_blocks(locktime);
}
return l;
}
/*
* We add changes to both our staging cstate (as they did when they sent
* it) and theirs (as they will when we ack it).
*/
Pkt *accept_pkt_htlc_add(struct peer *peer, const Pkt *pkt)
{
const UpdateAddHtlc *u = pkt->update_add_htlc;
struct sha256 rhash;
struct abs_locktime expiry;
struct htlc *htlc;
union htlc_staging stage;
/* BOLT #2:
*
* `amount_msat` MUST BE greater than 0.
*/
if (u->amount_msat == 0)
return pkt_err(peer, "Invalid amount_msat");
proto_to_sha256(u->r_hash, &rhash);
if (!proto_to_abs_locktime(u->expiry, &expiry))
return pkt_err(peer, "Invalid HTLC expiry");
if (abs_locktime_is_seconds(&expiry))
return pkt_err(peer, "HTLC expiry in seconds not supported!");
/* BOLT #2:
*
* A node MUST NOT add a HTLC if it would result in it
* offering more than 300 HTLCs in the remote commitment transaction.
*/
if (tal_count(peer->remote.staging_cstate->side[THEIRS].htlcs) == 300)
return pkt_err(peer, "Too many HTLCs");
/* BOLT #2:
*
* A node MUST set `id` to a unique identifier for this HTLC
* amongst all past or future `update_add_htlc` messages.
*/
/* Note that it's not *our* problem if they do this, it's
* theirs (future confusion). Nonetheless, we detect and
* error for them. */
if (htlc_map_get(&peer->remote.htlcs, u->id))
return pkt_err(peer, "HTLC id %"PRIu64" clashes for you", u->id);
/* BOLT #2:
*
* ...and the receiving node MUST add the HTLC addition to the
* unacked changeset for its local commitment. */
htlc = peer_new_htlc(peer, u->id, u->amount_msat, &rhash,
abs_locktime_to_blocks(&expiry),
u->route->info.data, u->route->info.len,
NULL, THEIRS);
/* BOLT #2:
*
* A node MUST NOT offer `amount_msat` it cannot pay for in
* the remote commitment transaction at the current `fee_rate` (see
* "Fee Calculation" ). A node SHOULD fail the connection if
* this occurs.
*/
if (!cstate_add_htlc(peer->local.staging_cstate, htlc, THEIRS)) {
tal_free(htlc);
return pkt_err(peer, "Cannot afford %"PRIu64" milli-satoshis"
" in our commitment tx",
u->amount_msat);
}
stage.add.add = HTLC_ADD;
stage.add.htlc = htlc;
add_unacked(&peer->local, &stage);
return NULL;
}
