It's not unheard of for people to give the wrong funding tx to us,
getting their funds stuck. Interestingly, we can allow mutual close
using a different txid and output number as long as they (solely)
funded the channel, and the channel hasn't been used.
This defines a "play area" feature to do just that.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Note that this also changes so the feature is not represented in channels,
reflecting the recent drafts.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: `experimental-onion-messages` enables send, receive and relay of onion messages.
Allow a user to switch on dual-funding without needing to compile
as EXPERIMENTAL_FEATURES.
Doesn't work yet, since everything is still behind
'EXPERIMENTAL_FEATURES' compile time flags... but useful for testing
This simplifies our test matrix, as we never have to handle talking
to peers that specify one but not the other.
This is particularly important for option_anchor_outputs which
assumes option_static_remotekey.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The main change here is that the previously-optional open/accept
fields and reestablish fields are now compulsory (everyone was
including them anyway). In fact, the open/accept is a TLV
because it was actually the same format.
For more details, see lightning-rfc/f068dd0d8dfa5ae75feedd99f269e23be4777381
Changelog-Removed: protocol: support for optioned form of reestablish messages now compulsory.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It's almost always "their_features" and "our_features" respectively, so
make those names clear.
Suggested-by: @cdecker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Turns out that unnecessary: all callers can access the feature_set,
so make it much more like a normal primitive.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This cleans up the boutique handling of features, and importantly, it
means that if a plugin says to offer a feature in init, we will now
*accept* that feature.
Changelog-Fixed: Plugins: setting an 'init' feature bit allows us to accept it from peers.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is to prepare for dynamic features, including making plugins first
class citizens at setting them.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We tag them with specific versions when they're experimental,
but do a poor job of cleaning them up (and thus ensuring they're
checked!) afterwards.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The spec is (RSN!) going to explicitly denote where each feature should
be presented, so create that infrastructure.
Incorporate the new proposed bolt11 features, which need this.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This was decided at a recent spec meeting: in particular, mpp and
var_onion_optin options will be used here.
We enhanced "features_supported" into "features_unsupported" so it
can return the first un-handlable bit number.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This is mainly an internal-only change, especially since we don't
offer any globalfeatures.
However, LND (as of next release) will offer global features, and also
expect option_static_remotekey to be a *global* feature. So we send
our (merged) feature bitset as both global and local in init, and fold
those bitsets together when we get an init msg.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
531c8d7d9b
In this one, we always send my_current_per_commitment_point, though it's
ignored. And we have our official feature numbers.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Generalize things a bit so OPTIONAL_FEATURE() and COMPULSORY_FEATURE()
work with either odd or even features, then explicitly use OPTIONAL_FEATURE
in our internal feature array.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We currently generally assume the features we offer are fixed; this
makes the code clearer and handles where we offer features iff
EXPERIMENTAL_FEATURES=1
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
As we add more features, the current code is insufficient.
1. Keep an array of single feature bits, for easy switching on and off.
2. Create feature_offered() which checks for both compulsory and optional
variants.
3. Invert requires_unsupported_features() and unsupported_features()
which tend to be double-negative, all_supported_features() and
features_supported().
4. Move single feature definition from wire/peer_wire.h to common/features.h.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
