--- /dev/null
+# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+An OpenFlow 1.0 L2 learning switch implementation.
+"""
+
+
+from ryu.base import app_manager
+from ryu.controller import ofp_event
+from ryu.controller.handler import MAIN_DISPATCHER
+from ryu.controller.handler import set_ev_cls
+from ryu.ofproto import ofproto_v1_0
+from ryu.lib.mac import haddr_to_bin
+from ryu.lib.packet import packet
+from ryu.lib.packet import ethernet
+from ryu.lib.packet import ether_types
+
+
+class SimpleSwitch(app_manager.RyuApp):
+ OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
+
+ def __init__(self, *args, **kwargs):
+ super(SimpleSwitch, self).__init__(*args, **kwargs)
+ self.mac_to_port = {}
+
+ def add_flow(self, datapath, in_port, dst, src, actions):
+ ofproto = datapath.ofproto
+
+ match = datapath.ofproto_parser.OFPMatch(
+ in_port=in_port,
+ dl_dst=haddr_to_bin(dst), dl_src=haddr_to_bin(src))
+
+ mod = datapath.ofproto_parser.OFPFlowMod(
+ datapath=datapath, match=match, cookie=0,
+ command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
+ priority=ofproto.OFP_DEFAULT_PRIORITY,
+ flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
+ datapath.send_msg(mod)
+
+ @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
+ def _packet_in_handler(self, ev):
+ msg = ev.msg
+ datapath = msg.datapath
+ ofproto = datapath.ofproto
+
+ pkt = packet.Packet(msg.data)
+ eth = pkt.get_protocol(ethernet.ethernet)
+
+ if eth.ethertype == ether_types.ETH_TYPE_LLDP:
+ # ignore lldp packet
+ return
+ dst = eth.dst
+ src = eth.src
+
+ dpid = datapath.id
+ self.mac_to_port.setdefault(dpid, {})
+
+ self.logger.info("packet in %s %s %s %s", dpid, src, dst, msg.in_port)
+
+ # learn a mac address to avoid FLOOD next time.
+ self.mac_to_port[dpid][src] = msg.in_port
+
+ if dst in self.mac_to_port[dpid]:
+ out_port = self.mac_to_port[dpid][dst]
+ else:
+ out_port = ofproto.OFPP_FLOOD
+
+ actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
+
+ # install a flow to avoid packet_in next time
+ if out_port != ofproto.OFPP_FLOOD:
+ self.add_flow(datapath, msg.in_port, dst, src, actions)
+
+ data = None
+ if msg.buffer_id == ofproto.OFP_NO_BUFFER:
+ data = msg.data
+
+ out = datapath.ofproto_parser.OFPPacketOut(
+ datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
+ actions=actions, data=data)
+ datapath.send_msg(out)
+
+ @set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
+ def _port_status_handler(self, ev):
+ msg = ev.msg
+ reason = msg.reason
+ port_no = msg.desc.port_no
+
+ ofproto = msg.datapath.ofproto
+ if reason == ofproto.OFPPR_ADD:
+ self.logger.info("port added %s", port_no)
+ elif reason == ofproto.OFPPR_DELETE:
+ self.logger.info("port deleted %s", port_no)
+ elif reason == ofproto.OFPPR_MODIFY:
+ self.logger.info("port modified %s", port_no)
+ else:
+ self.logger.info("Illeagal port state %s %s", port_no, reason)