【SDN課設】正式開始第一步：源碼解析+arp回覆

正式開始

ryu源碼分析之packet類

ryupacket源碼

ryu packet文檔

結合這個例子學習構造包下發

逐級封裝：

e = ethernet.ethernet(dst='ff:ff:ff:ff:ff:ff',
                      src='08:60:6e:7f:74:e7',
                      ethertype=ether.ETH_TYPE_ARP)
a = arp.arp(hwtype=1, proto=0x0800, hlen=6, plen=4, opcode=2,
            src_mac='08:60:6e:7f:74:e7', src_ip='192.0.2.1',
            dst_mac='00:00:00:00:00:00', dst_ip='192.0.2.2')
p = packet.Packet()
p.add_protocol(e)
p.add_protocol(a)

添加action事件下發包

actions = [parser.OFPActionOutput(port=port)]
out =parser.OFPPacketOut(datapath=datapath,buffer_id=ofproto.OFP_NO_BUFFER,in_port=ofproto.OFPP_CONTROLLER,actions=actions,data=data)
datapath.send_msg(out)