core, eth: enforce network split post DAO hard-fork

eth/peer.go

@@ -59,10 +59,12 @@ type peer struct {
 	*p2p.Peer
 	rw p2p.MsgReadWriter
 
-	version int // Protocol version negotiated
-	head    common.Hash
-	td      *big.Int
-	lock    sync.RWMutex
+	version  int         // Protocol version negotiated
+	forkDrop *time.Timer // Timed connection dropper if forks aren't validated in time
+
+	head common.Hash
+	td   *big.Int
+	lock sync.RWMutex
 
 	knownTxs    *set.Set // Set of transaction hashes known to be known by this peer
 	knownBlocks *set.Set // Set of block hashes known to be known by this peer