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Viewing changes to ryu/app/simple_switch_12.py

  • Committer: Package Import Robot
  • Author(s): Dariusz Dwornikowski
  • Date: 2014-08-18 16:58:52 UTC
  • Revision ID: package-import@ubuntu.com-20140818165852-i0qck3g5mw7rtxt0
Tags: upstream-3.12
Import upstream version 3.12

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ryu/app/simple_switch_12.py
 
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# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
 
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#
 
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# Licensed under the Apache License, Version 2.0 (the "License");
 
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# you may not use this file except in compliance with the License.
 
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# You may obtain a copy of the License at
 
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#
 
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#    http://www.apache.org/licenses/LICENSE-2.0
 
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#
 
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# Unless required by applicable law or agreed to in writing, software
 
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# distributed under the License is distributed on an "AS IS" BASIS,
 
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 
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# implied.
 
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# See the License for the specific language governing permissions and
 
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# limitations under the License.
 
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import logging
 
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import struct
 
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from ryu.base import app_manager
 
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from ryu.controller import ofp_event
 
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from ryu.controller.handler import MAIN_DISPATCHER
 
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from ryu.controller.handler import set_ev_cls
 
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from ryu.ofproto import ofproto_v1_2
 
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from ryu.lib.packet import packet
 
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from ryu.lib.packet import ethernet
 
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class SimpleSwitch12(app_manager.RyuApp):
 
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    OFP_VERSIONS = [ofproto_v1_2.OFP_VERSION]
 
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    def __init__(self, *args, **kwargs):
 
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        super(SimpleSwitch12, self).__init__(*args, **kwargs)
 
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        self.mac_to_port = {}
 
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    def add_flow(self, datapath, port, dst, actions):
 
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        ofproto = datapath.ofproto
 
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        match = datapath.ofproto_parser.OFPMatch(in_port=port,
 
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                                                 eth_dst=dst)
 
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        inst = [datapath.ofproto_parser.OFPInstructionActions(
 
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                ofproto.OFPIT_APPLY_ACTIONS, actions)]
 
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        mod = datapath.ofproto_parser.OFPFlowMod(
 
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            datapath=datapath, cookie=0, cookie_mask=0, table_id=0,
 
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            command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
 
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            priority=0, buffer_id=ofproto.OFP_NO_BUFFER,
 
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            out_port=ofproto.OFPP_ANY,
 
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            out_group=ofproto.OFPG_ANY,
 
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            flags=0, match=match, instructions=inst)
 
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        datapath.send_msg(mod)
 
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    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
 
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    def _packet_in_handler(self, ev):
 
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        msg = ev.msg
 
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        datapath = msg.datapath
 
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        ofproto = datapath.ofproto
 
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        in_port = msg.match['in_port']
 
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        pkt = packet.Packet(msg.data)
 
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        eth = pkt.get_protocols(ethernet.ethernet)[0]
 
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        dst = eth.dst
 
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        src = eth.src
 
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        dpid = datapath.id
 
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        self.mac_to_port.setdefault(dpid, {})
 
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        self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
 
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        # learn a mac address to avoid FLOOD next time.
 
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        self.mac_to_port[dpid][src] = in_port
 
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        if dst in self.mac_to_port[dpid]:
 
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            out_port = self.mac_to_port[dpid][dst]
 
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        else:
 
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            out_port = ofproto.OFPP_FLOOD
 
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        actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
 
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        # install a flow to avoid packet_in next time
 
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        if out_port != ofproto.OFPP_FLOOD:
 
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            self.add_flow(datapath, in_port, dst, actions)
 
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        out = datapath.ofproto_parser.OFPPacketOut(
 
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            datapath=datapath, buffer_id=msg.buffer_id, in_port=in_port,
 
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            actions=actions)
 
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        datapath.send_msg(out)