Update example.py

Currently not working.

example.py

@@ -214,6 +214,38 @@ class L3Switch(app_manager.RyuApp):
                                   in_port=in_port, actions=actions, data=data)
         datapath.send_msg(out)
 
+    def do_l3_switch(self, datapath, dpid, packet, frame, ipv4_pkt, in_port, buffer_id=None):
+        ofproto = datapath.ofproto
+        parser = datapath.ofproto_parser
+
+        if ipv4_pkt.dst in self.ip_to_mac[dpid]:
+            dstMac = self.ip_to_mac[dpid][ipv4_pkt.dst]
+        else:
+            self.send_arp(datapath, 1, self.MAC_ADDR, ipv4_pkt.src, "FF:FF:FF:FF:FF:FF", ipv4_pkt.dst, ofproto.OFPP_FLOOD)
+            return
+
+        out_port = self.mac_to_port[dstMac]
+        actions = [parser.OFPActionSetDlSrc(ipv4_pkt.src), parser.OFPActionSetDlDst(ipv4_pkt.dst), parser.OFPActionOutput(out_port)]
+
+        # install a flow to avoid packet_in next time
+        match = parser.OFPMatch(dl_src=ipv4_pkt.src, dl_dst=ipv4_pkt.dst)
+        # verify if we have a valid buffer_id, if yes avoid to send both
+        # flow_mod & packet_out
+        if buffer_id != ofproto.OFP_NO_BUFFER:
+            self.add_flow(datapath, 1, match, actions, buffer_id)
+            return
+        else:
+            self.add_flow(datapath, 1, match, actions)
+        data = None
+        if buffer_id == ofproto.OFP_NO_BUFFER:
+            data = packet.data
+
+        out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
+                                  in_port=in_port, actions=actions, data=data)
+        datapath.send_msg(out)
+
+
+
     @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
     def _packet_in_handler(self, ev):
         # If you hit this you might want to increase
@@ -269,6 +301,7 @@ class L3Switch(app_manager.RyuApp):
                     pkt.get_protocols(ethernet.ethernet)[0].dst = dstMac
                     pkt.get_protocols(ethernet.ethernet)[0].src = self.MAC_ADDR
                     port = self.mac_to_port[dpid][dstMac]
+                    self.do_l3_switch(datapath, dpid, pkt, eth, ipv4_pkt, in_port, msg.buffer_id)
                     #self.logger.info(port)
                     self.send_packet(datapath, port, pkt)
                 pass