add simple learning switch app for OF1.3

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/app/simple_switch_13.py

@@ -0,0 +1,87 @@
+# 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.
+
+import logging
+import struct
+
+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_3
+from ryu.lib.packet import packet
+from ryu.lib.packet import ethernet
+
+
+class SimpleSwitch13(app_manager.RyuApp):
+    OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
+
+    def __init__(self, *args, **kwargs):
+        super(SimpleSwitch13, self).__init__(*args, **kwargs)
+        self.mac_to_port = {}
+
+    def add_flow(self, datapath, port, dst, actions):
+        ofproto = datapath.ofproto
+
+        match = datapath.ofproto_parser.OFPMatch(in_port=port,
+                                                 eth_dst=dst)
+        inst = [datapath.ofproto_parser.OFPInstructionActions(
+                ofproto.OFPIT_APPLY_ACTIONS, actions)]
+
+        mod = datapath.ofproto_parser.OFPFlowMod(
+            datapath=datapath, cookie=0, cookie_mask=0, table_id=0,
+            command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
+            priority=0, buffer_id=ofproto.OFP_NO_BUFFER,
+            out_port=ofproto.OFPP_ANY,
+            out_group=ofproto.OFPG_ANY,
+            flags=0, match=match, instructions=inst)
+        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
+        in_port = msg.match['in_port']
+
+        pkt = packet.Packet(msg.data)
+        eth = pkt.get_protocols(ethernet.ethernet)[0]
+
+        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, in_port)
+
+        # learn a mac address to avoid FLOOD next time.
+        self.mac_to_port[dpid][src] = 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, in_port, dst, actions)
+
+        out = datapath.ofproto_parser.OFPPacketOut(
+            datapath=datapath, buffer_id=msg.buffer_id, in_port=in_port,
+            actions=actions)
+        datapath.send_msg(out)