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openingd: allow channel_type to *downgrade* from default.

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e.g. you can negotiate anchor_outputs, but still ask for a
non-anchor-output channel.

If/when we make those features compulsory, downgrade will
not be allowed.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-09-10 11:44:23 +09:30 • committed by Christian Decker
parent 65290c02ba
commit b985cd774d
1 changed files with 18 additions and 15 deletions
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33
openingd/openingd.c
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@ -832,27 +832,30 @@ static u8 *fundee_channel(struct state *state, const u8 *open_channel_msg)
"Parsing open_channel %s", tal_hex(tmpctx, open_channel_msg));
set_remote_upfront_shutdown(state, open_tlvs->upfront_shutdown_script);
state->channel_type
= default_channel_type(state,
state->our_features, state->their_features);
/* BOLT-channel-types #2:
* The receiving node MUST fail the channel if:
*...
* - It supports `channel_type`, `channel_type` was set, and the
* `type` is not suitable.
*/
/* FIXME: We in fact insist on the exact type we want! */
if (open_tlvs->channel_type
&& !featurebits_eq(state->channel_type->features,
open_tlvs->channel_type)) {
negotiation_failed(state, false,
"Did not support channel_type %s",
fmt_featurebits(tmpctx,
open_tlvs->channel_type));
return NULL;
}
if (open_tlvs->channel_type) {
state->channel_type =
channel_type_accept(state,
open_tlvs->channel_type,
state->our_features,
state->their_features);
if (!state->channel_type) {
negotiation_failed(state, false,
"Did not support channel_type %s",
fmt_featurebits(tmpctx,
open_tlvs->channel_type));
return NULL;
}
} else
state->channel_type
= default_channel_type(state,
state->our_features,
state->their_features);
/* BOLT #2:
*