# Copyright (C) 2013 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 struct from ryu.base import app_manager from ryu.controller.handler import set_ev_cls from ryu.ofproto import ofproto_v1_0 from ryu.lib import addrconv from ryu.lib import lacplib from ryu.lib.dpid import str_to_dpid class SimpleSwitchLacp(app_manager.RyuApp): OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION] _CONTEXTS = {'lacplib': lacplib.LacpLib} def __init__(self, *args, **kwargs): super(SimpleSwitchLacp, self).__init__(*args, **kwargs) self.mac_to_port = {} self._lacp = kwargs['lacplib'] # in this sample application, bonding i/fs of the switchs # shall be set up as follows: # - the port 1 and 2 of the datapath 1 face the slave i/fs. # - the port 3, 4 and 5 of the datapath 1 face the others. # - the port 1 and 2 of the datapath 2 face the others. self._lacp.add( dpid=str_to_dpid('0000000000000001'), ports=[1, 2]) self._lacp.add( dpid=str_to_dpid('0000000000000001'), ports=[3, 4, 5]) self._lacp.add( dpid=str_to_dpid('0000000000000002'), ports=[1, 2]) def add_flow(self, datapath, in_port, dst, actions): ofproto = datapath.ofproto parser = datapath.ofproto_parser match = parser.OFPMatch(in_port=in_port, dl_dst=addrconv.mac.text_to_bin(dst)) mod = parser.OFPFlowMod( datapath=datapath, match=match, cookie=0, command=ofproto.OFPFC_ADD, actions=actions) datapath.send_msg(mod) def del_flow(self, datapath, dst): ofproto = datapath.ofproto parser = datapath.ofproto_parser match = parser.OFPMatch(dl_dst=addrconv.mac.text_to_bin(dst)) mod = parser.OFPFlowMod( datapath=datapath, match=match, cookie=0, command=ofproto.OFPFC_DELETE) datapath.send_msg(mod) @set_ev_cls(lacplib.EventPacketIn, lacplib.LAG_EV_DISPATCHER) def _packet_in_handler(self, ev): msg = ev.msg datapath = msg.datapath ofproto = datapath.ofproto (dst_, src_, _eth_type) = struct.unpack_from( '!6s6sH', buffer(msg.data), 0) src = addrconv.mac.bin_to_text(src_) dst = addrconv.mac.bin_to_text(dst_) 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, actions) out = datapath.ofproto_parser.OFPPacketOut( datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port, actions=actions) datapath.send_msg(out) @set_ev_cls(lacplib.EventSlaveStateChanged, lacplib.LAG_EV_DISPATCHER) def _slave_state_changed_handler(self, ev): datapath = ev.datapath dpid = datapath.id port_no = ev.port enabled = ev.enabled self.logger.info("slave state changed port: %d enabled: %s", port_no, enabled) if dpid in self.mac_to_port: for mac in self.mac_to_port[dpid]: self.del_flow(datapath, mac) del self.mac_to_port[dpid] self.mac_to_port.setdefault(dpid, {})