BOLT 9: Guess at assignment of feature bis.

There are only two channel (prev "global") features, which you have to
know to route payments through a channel: wumborama and status.  Both
should be advertized as odd bits in channel_announcement, since it's
fine if a node doesn't understand them.

The other options are now advertized (thanks to node_announcment
combinedfeatures) but don't effect routing, so they're peerfeatures.

We might be able to get rid of `option_will_fund_for_food`; it's only
used to flag the existence of the two extra fields in
node_announcement, for which `option_dual_fund` could be used instead
(with some flag value meaning "will not fund for food).

Signed-off-by: Rusty Russell <[email protected]>

09-features.md

@@ -28,10 +28,30 @@ These flags may only be used in the `init` message:
 | 3  | `initial_routing_sync` | Indicates that the sending node needs a complete routing information dump | [BOLT #7](07-routing-gossip.md#initial-sync) |
 | 4/5  | `option_upfront_shutdown_script` | Commits to a shutdown scriptpubkey when opening channel | [BOLT #2](02-peer-protocol.md#the-open_channel-message) |
 | 6/7  | `gossip_queries`           | More sophisticated gossip control | [BOLT #7](07-routing-gossip.md#query-messages) |
+| 8/9  | `option_simplified_commitment`   | New commitment transaction format | TBA |
+| 10/11  | `option_error_codes`   | `error` message contains error code | TBA |
+| 12/13  | `option_splice`   | Funding transactions can be upgraded | TBA |
+| 14/15  | `option_i_wumbo_you_wumbo`   | Can create large channels | TBA |
+| 18/19  | `option_dual_fund`   | Flexible funding negotation | TBA |
+| 20/21  | `option_will_fund_for_food`   | node_announcment contains funding rate | TBA |
+| 22/23  | `option_2p_ecdsa`   | Single-key funding negotiation | TBA |
+| 24/25  | `option_inv_gossip`   | Gossip pulled rather than pushed | TBA |
+| 26/27  | `option_fec_gossip`   | Gossip set reconciliation | TBA |
+| 28/29  | `option_schnorr_gossip`   | Compact gossip messages | TBA |
+| 30/31  | `option_offer_tx_proof`   | Can provide tx proofs | TBA |
+| 32/33  | `option_want_tx_proof`    | Wants tx proofs | TBA |
 
 ## Assigned `channelfeatures` flags
 
-There are currently no `channelfeatures` flags.
+The `channel_announcement` column indicates how this feature is
+advertized in `channel_announcement`'s `channelfeatures` field.  `Odd`
+is used to indicate to other nodes that they don't have to understand
+this to route through, and `Even` is used to indicate that it is.
+
+| Bits | Name | Description | `channel_announcment` | Link |
+|------|------|-------------|-----------------------|------|
+| 16/17  | `option_wumborama` | Can handle large payments | Odd | TBA |
+| 34/35  | `option_status` | Sends soft-error status responses | Odd | TBA |
 
 ## Requirements