lightningd: update BOLT to add channel_reestablish message.

We don't handle it yet though.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/channel/channel.c

@@ -977,6 +977,7 @@ static struct io_plan *peer_in(struct io_conn *conn, struct peer *peer, u8 *msg)
 	case WIRE_ACCEPT_CHANNEL:
 	case WIRE_FUNDING_CREATED:
 	case WIRE_FUNDING_SIGNED:
+	case WIRE_CHANNEL_REESTABLISH:
 		goto badmessage;
 
 	case WIRE_SHUTDOWN:

lightningd/gossip/gossip.c

@@ -241,6 +241,7 @@ static struct io_plan *peer_msgin(struct io_conn *conn,
 		return peer_read_message(conn, &peer->pcs, peer_msgin);
 
 	case WIRE_OPEN_CHANNEL:
+	case WIRE_CHANNEL_REESTABLISH:
 	case WIRE_ACCEPT_CHANNEL:
 	case WIRE_FUNDING_CREATED:
 	case WIRE_FUNDING_SIGNED:

lightningd/peer_control.c

@@ -192,7 +192,7 @@ static bool peer_reconnected(struct lightningd *ld,
 		 *
 		 * On disconnection, the funder MUST remember the channel for
 		 * reconnection if it has broadcast the funding transaction,
-		 * otherwise it MUST NOT.
+		 * otherwise it SHOULD NOT.
 		 */
 		/* Free peer, which will discard HSM response. */
 		tal_free(peer);

lightningd/peer_control.h

@@ -104,11 +104,11 @@ static inline bool peer_on_chain(const struct peer *peer)
  *
  * On disconnection, the funder MUST remember the channel for
  * reconnection if it has broadcast the funding transaction, otherwise it
- * MUST NOT.
+ * SHOULD NOT.
  *
  * On disconnection, the non-funding node MUST remember the channel for
  * reconnection if it has sent the `funding_signed` message, otherwise
- * it MUST NOT.
+ * it SHOULD NOT.
  */
 static inline bool peer_persists(const struct peer *peer)
 {

wire/gen_peer_wire_csv

@@ -97,6 +97,10 @@ revoke_and_ack,64,next_per_commitment_point,33
 update_fee,134
 update_fee,0,channel_id,32
 update_fee,32,feerate_per_kw,4
+channel_reestablish,136
+channel_reestablish,0,channel_id,32
+channel_reestablish,32,commitments_received,8
+channel_reestablish,40,revocations_received,8
 announcement_signatures,259
 announcement_signatures,0,channel_id,32
 announcement_signatures,32,short_channel_id,8

wire/peer_wire.c

@@ -19,6 +19,7 @@ static bool unknown_type(enum wire_type t)
 	case WIRE_COMMITMENT_SIGNED:
 	case WIRE_REVOKE_AND_ACK:
 	case WIRE_UPDATE_FEE:
+	case WIRE_CHANNEL_REESTABLISH:
 	case WIRE_ANNOUNCEMENT_SIGNATURES:
 	case WIRE_CHANNEL_ANNOUNCEMENT:
 	case WIRE_NODE_ANNOUNCEMENT: