--- src/syscall/route_openbsd.go.orig	Fri Jul 25 23:38:47 2014
+++ src/syscall/route_openbsd.go	Fri Jul 25 23:39:20 2014
@@ -12,16 +12,16 @@ func (any *anyMessage) toRoutingMessage(b []byte) Rout
 	switch any.Type {
 	case RTM_ADD, RTM_DELETE, RTM_CHANGE, RTM_GET, RTM_LOSING, RTM_REDIRECT, RTM_MISS, RTM_LOCK, RTM_RESOLVE:
 		p := (*RouteMessage)(unsafe.Pointer(any))
-		return &RouteMessage{Header: p.Header, Data: b[SizeofRtMsghdr:any.Msglen]}
+		return &RouteMessage{Header: p.Header, Data: b[p.Header.Hdrlen:any.Msglen]}
 	case RTM_IFINFO:
 		p := (*InterfaceMessage)(unsafe.Pointer(any))
-		return &InterfaceMessage{Header: p.Header, Data: b[SizeofIfMsghdr:any.Msglen]}
+		return &InterfaceMessage{Header: p.Header, Data: b[p.Header.Hdrlen:any.Msglen]}
 	case RTM_IFANNOUNCE:
 		p := (*InterfaceAnnounceMessage)(unsafe.Pointer(any))
 		return &InterfaceAnnounceMessage{Header: p.Header}
 	case RTM_NEWADDR, RTM_DELADDR:
 		p := (*InterfaceAddrMessage)(unsafe.Pointer(any))
-		return &InterfaceAddrMessage{Header: p.Header, Data: b[SizeofIfaMsghdr:any.Msglen]}
+		return &InterfaceAddrMessage{Header: p.Header, Data: b[p.Header.Hdrlen:any.Msglen]}
 	}
 	return nil
 }