eth: introduce eth67 protocol (#24093)

The new protocol version removes support for GetNodeData.
See https://eips.ethereum.org/EIPS/eip-4938 for more information.

Co-authored-by: Felix Lange <fjl@twurst.com>
Co-authored-by: Martin Holst Swende <martin@swende.se>

eth/protocols/eth/handler.go

@@ -181,6 +181,21 @@ var eth66 = map[uint64]msgHandler{
 	PooledTransactionsMsg:         handlePooledTransactions66,
 }
 
+var eth67 = map[uint64]msgHandler{
+	NewBlockHashesMsg:             handleNewBlockhashes,
+	NewBlockMsg:                   handleNewBlock,
+	TransactionsMsg:               handleTransactions,
+	NewPooledTransactionHashesMsg: handleNewPooledTransactionHashes,
+	GetBlockHeadersMsg:            handleGetBlockHeaders66,
+	BlockHeadersMsg:               handleBlockHeaders66,
+	GetBlockBodiesMsg:             handleGetBlockBodies66,
+	BlockBodiesMsg:                handleBlockBodies66,
+	GetReceiptsMsg:                handleGetReceipts66,
+	ReceiptsMsg:                   handleReceipts66,
+	GetPooledTransactionsMsg:      handleGetPooledTransactions66,
+	PooledTransactionsMsg:         handlePooledTransactions66,
+}
+
 // handleMessage is invoked whenever an inbound message is received from a remote
 // peer. The remote connection is torn down upon returning any error.
 func handleMessage(backend Backend, peer *Peer) error {
@@ -195,9 +210,9 @@ func handleMessage(backend Backend, peer *Peer) error {
 	defer msg.Discard()
 
 	var handlers = eth66
-	//if peer.Version() >= ETH67 { // Left in as a sample when new protocol is added
-	//	handlers = eth67
-	//}
+	if peer.Version() >= ETH67 {
+		handlers = eth67
+	}
 
 	// Track the amount of time it takes to serve the request and run the handler
 	if metrics.Enabled {

eth/protocols/eth/protocol.go

@@ -31,6 +31,7 @@ import (
 // Constants to match up protocol versions and messages
 const (
 	ETH66 = 66
+	ETH67 = 67
 )
 
 // ProtocolName is the official short name of the `eth` protocol used during
@@ -39,11 +40,11 @@ const ProtocolName = "eth"
 
 // ProtocolVersions are the supported versions of the `eth` protocol (first
 // is primary).
-var ProtocolVersions = []uint{ETH66}
+var ProtocolVersions = []uint{ETH67, ETH66}
 
 // protocolLengths are the number of implemented message corresponding to
 // different protocol versions.
-var protocolLengths = map[uint]uint64{ETH66: 17}
+var protocolLengths = map[uint]uint64{ETH67: 17, ETH66: 17}
 
 // maxMessageSize is the maximum cap on the size of a protocol message.
 const maxMessageSize = 10 * 1024 * 1024