ffc1f82554
this application provides the simple example of IGMP snooping. the module "igmplib" mainly offers 2 functions: - listening on in the IGMP conversation between multicast routers and hosts - emulating of the querier function of multicast servers the former operates a switch as a snooping switch and controls transmission of an unnecessary multicasting packet. the latter realizes the IGMP conversation in the environment without multicast routers. the module "simple_switch_igmp" is a variation of "simple_switch". the switch receives the "EventPacketIn" event instead of the "EventOFPPacketIn" event from the module "igmplib" in order to except IGMP. Signed-off-by: Yuichi Ito <ito.yuichi0@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
105 lines
3.8 KiB
Python
105 lines
3.8 KiB
Python
# Copyright (C) 2013 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 struct
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from ryu.base import app_manager
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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 import addrconv
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from ryu.lib import igmplib
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from ryu.lib.dpid import str_to_dpid
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class SimpleSwitchIgmp(app_manager.RyuApp):
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OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
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_CONTEXTS = {'igmplib': igmplib.IgmpLib}
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def __init__(self, *args, **kwargs):
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super(SimpleSwitchIgmp, self).__init__(*args, **kwargs)
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self.mac_to_port = {}
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self._snoop = kwargs['igmplib']
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# if you want a switch to operate as a querier,
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# set up as follows:
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self._snoop.set_querier_mode(
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dpid=str_to_dpid('0000000000000001'), server_port=2)
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# dpid the datapath id that will operate as a querier.
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# server_port a port number which connect to the multicast
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# server.
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#
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# NOTE: you can set up only the one querier.
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# when you called this method several times,
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# only the last one becomes effective.
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def add_flow(self, datapath, in_port, dst, actions):
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ofproto = datapath.ofproto
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parser = datapath.ofproto_parser
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match = parser.OFPMatch(in_port=in_port,
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dl_dst=addrconv.mac.text_to_bin(dst))
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mod = parser.OFPFlowMod(
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datapath=datapath, match=match, cookie=0,
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command=ofproto.OFPFC_ADD, actions=actions)
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datapath.send_msg(mod)
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@set_ev_cls(igmplib.EventPacketIn, 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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(dst_, src_, _eth_type) = struct.unpack_from(
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'!6s6sH', buffer(msg.data), 0)
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src = addrconv.mac.bin_to_text(src_)
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dst = addrconv.mac.bin_to_text(dst_)
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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",
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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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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)
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datapath.send_msg(out)
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@set_ev_cls(igmplib.EventMulticastGroupStateChanged,
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MAIN_DISPATCHER)
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def _status_changed(self, ev):
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msg = {
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igmplib.MG_GROUP_ADDED: 'Multicast Group Added',
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igmplib.MG_MEMBER_CHANGED: 'Multicast Group Member Changed',
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igmplib.MG_GROUP_REMOVED: 'Multicast Group Removed',
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}
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self.logger.info("%s: [%s] querier:[%s] hosts:%s",
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msg.get(ev.reason), ev.address, ev.src,
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ev.dsts)
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