1 # Method for just sending a packet to any port (broadcast by default) 2 def send_packet (event, dst_port = of.OFPP_ALL): 3 msg = of.ofp_packet_out(in_port=event.ofp.in_port) 4 if event.ofp.buffer_id != -1 and event.ofp.buffer_id is not None: 5 # We got a buffer ID from the switch; use that 6 msg.buffer_id = event.ofp.buffer_id 7 else: 8 # No buffer ID from switch -- we got the raw data 9 if event.ofp.data: 10 # No raw_data specified -- nothing to send! 11 return 12 msg.data = event.ofp.data 13 msg.actions.append(of.ofp_action_output(port = dst_port)) 14 event.connection.send(msg)
第9行是否应为：
if event.ofp.data is None:
