109 lines
3.6 KiB
Python
109 lines
3.6 KiB
Python
# 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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"""
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An OpenFlow 1.0 L2 learning switch implementation.
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"""
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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 mac_to_port
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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_0
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from ryu.lib.mac import haddr_to_bin
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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 SimpleSwitch(app_manager.RyuApp):
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OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
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def __init__(self, *args, **kwargs):
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super(SimpleSwitch, self).__init__(*args, **kwargs)
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self.mac_to_port = {}
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def add_flow(self, datapath, in_port, dst, actions):
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ofproto = datapath.ofproto
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match = datapath.ofproto_parser.OFPMatch(
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in_port=in_port, dl_dst=haddr_to_bin(dst))
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mod = datapath.ofproto_parser.OFPFlowMod(
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datapath=datapath, match=match, cookie=0,
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command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
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priority=ofproto.OFP_DEFAULT_PRIORITY,
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flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
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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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pkt = packet.Packet(msg.data)
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eth = pkt.get_protocol(ethernet.ethernet)
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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, msg.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] = msg.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, msg.in_port, dst, actions)
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data = None
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if msg.buffer_id == ofproto.OFP_NO_BUFFER:
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data = msg.data
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out = datapath.ofproto_parser.OFPPacketOut(
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datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
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actions=actions, data=data)
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datapath.send_msg(out)
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@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
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def _port_status_handler(self, ev):
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msg = ev.msg
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reason = msg.reason
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port_no = msg.desc.port_no
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ofproto = msg.datapath.ofproto
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if reason == ofproto.OFPPR_ADD:
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self.logger.info("port added %s", port_no)
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elif reason == ofproto.OFPPR_DELETE:
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self.logger.info("port deleted %s", port_no)
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elif reason == ofproto.OFPPR_MODIFY:
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self.logger.info("port modified %s", port_no)
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else:
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self.logger.info("Illeagal port state %s %s", port_no, reason)
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