e1ae103b78
Signed-off-by: itoyuichi <ito.yuichi0@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
334 lines
13 KiB
Python
334 lines
13 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 logging
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from ryu.base import app_manager
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from ryu.controller import event
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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 ether
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from ryu.ofproto import ofproto_v1_0
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from ryu.ofproto import ofproto_v1_2
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from ryu.ofproto import ofproto_v1_3
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from ryu.lib import addrconv
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from ryu.lib.dpid import dpid_to_str
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from ryu.lib.packet import packet
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from ryu.lib.packet import ethernet
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from ryu.lib.packet import slow
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LAG_EV_DISPATCHER = "lacplib"
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class EventPacketIn(event.EventBase):
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"""a PacketIn event class using except LACP."""
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def __init__(self, msg):
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"""initialization."""
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super(EventPacketIn, self).__init__()
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self.msg = msg
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class EventSlaveStateChanged(event.EventBase):
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"""a event class that notifies the changes of the statuses of the
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slave i/fs."""
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def __init__(self, datapath, port, enabled):
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"""initialization."""
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super(EventSlaveStateChanged, self).__init__()
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self.datapath = datapath
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self.port = port
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self.enabled = enabled
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class LacpLib(app_manager.RyuApp):
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"""LACP exchange library. this works only in a PASSIVE mode."""
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#-------------------------------------------------------------------
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# PUBLIC METHODS
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#-------------------------------------------------------------------
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def __init__(self):
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"""initialization."""
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super(LacpLib, self).__init__()
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self.name = 'lacplib'
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self._bonds = []
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self._add_flow = {
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ofproto_v1_0.OFP_VERSION: self._add_flow_v1_0,
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ofproto_v1_2.OFP_VERSION: self._add_flow_v1_2,
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ofproto_v1_3.OFP_VERSION: self._add_flow_v1_2,
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}
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self._set_logger()
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def add(self, dpid, ports):
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"""add a setting of a bonding i/f.
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'add' method takes the correspondig args in this order.
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========= =====================================================
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Attribute Description
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========= =====================================================
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dpid datapath id.
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ports a list of integer values that means the ports face
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with the slave i/fs.
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========= =====================================================
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if you want to use multi LAG, call 'add' method more than once.
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"""
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assert isinstance(ports, list)
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assert 2 <= len(ports)
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ifs = {}
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for port in ports:
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ifs[port] = {'enabled': False, 'timeout': 0}
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bond = {}
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bond[dpid] = ifs
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self._bonds.append(bond)
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#-------------------------------------------------------------------
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# PUBLIC METHODS ( EVENT HANDLERS )
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#-------------------------------------------------------------------
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@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
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def packet_in_handler(self, evt):
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"""PacketIn event handler. when the received packet was LACP,
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proceed it. otherwise, send a event."""
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req_pkt = packet.Packet(evt.msg.data)
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if slow.lacp in req_pkt:
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(req_lacp, ) = req_pkt.get_protocols(slow.lacp)
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(req_eth, ) = req_pkt.get_protocols(ethernet.ethernet)
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self._do_lacp(req_lacp, req_eth.src, evt.msg)
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else:
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self.send_event_to_observers(EventPacketIn(evt.msg))
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@set_ev_cls(ofp_event.EventOFPFlowRemoved, MAIN_DISPATCHER)
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def flow_removed_handler(self, evt):
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"""FlowRemoved event handler. when the removed flow entry was
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for LACP, set the status of the slave i/f to disabled, and
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send a event."""
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msg = evt.msg
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datapath = msg.datapath
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ofproto = datapath.ofproto
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dpid = datapath.id
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match = msg.match
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if ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
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port = match.in_port
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dl_type = match.dl_type
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else:
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port = match['in_port']
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dl_type = match['eth_type']
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if ether.ETH_TYPE_SLOW != dl_type:
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return
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self.logger.info(
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"SW=%s PORT=%d LACP exchange timeout has occurred.",
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dpid_to_str(dpid), port)
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self._set_slave_enabled(dpid, port, False)
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self._set_slave_timeout(dpid, port, 0)
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self.send_event_to_observers(
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EventSlaveStateChanged(datapath, port, False))
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#-------------------------------------------------------------------
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# PRIVATE METHODS ( RELATED TO LACP )
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#-------------------------------------------------------------------
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def _do_lacp(self, req_lacp, src, msg):
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"""packet-in process when the received packet is LACP."""
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datapath = msg.datapath
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dpid = datapath.id
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ofproto = datapath.ofproto
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parser = datapath.ofproto_parser
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if ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
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port = msg.in_port
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else:
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port = msg.match['in_port']
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self.logger.info("SW=%s PORT=%d LACP received.",
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dpid_to_str(dpid), port)
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self.logger.debug(str(req_lacp))
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# when LACP arrived at disabled port, update the status of
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# the slave i/f to enabled, and send a event.
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if not self._get_slave_enabled(dpid, port):
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self.logger.info(
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"SW=%s PORT=%d the slave i/f has just been up.",
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dpid_to_str(dpid), port)
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self._set_slave_enabled(dpid, port, True)
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self.send_event_to_observers(
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EventSlaveStateChanged(datapath, port, True))
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# set the idle_timeout time using the actor state of the
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# received packet.
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if req_lacp.LACP_STATE_SHORT_TIMEOUT == \
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req_lacp.actor_state_timeout:
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idle_timeout = req_lacp.SHORT_TIMEOUT_TIME
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else:
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idle_timeout = req_lacp.LONG_TIMEOUT_TIME
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# when the timeout time has changed, update the timeout time of
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# the slave i/f and re-enter a flow entry for the packet from
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# the slave i/f with idle_timeout.
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if idle_timeout != self._get_slave_timeout(dpid, port):
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self.logger.info(
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"SW=%s PORT=%d the timeout time has changed.",
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dpid_to_str(dpid), port)
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self._set_slave_timeout(dpid, port, idle_timeout)
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func = self._add_flow.get(ofproto.OFP_VERSION)
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assert func
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func(src, port, idle_timeout, datapath)
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# create a response packet.
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res_pkt = self._create_response(datapath, port, req_lacp)
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# packet-out the response packet.
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out_port = ofproto.OFPP_IN_PORT
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actions = [parser.OFPActionOutput(out_port)]
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out = datapath.ofproto_parser.OFPPacketOut(
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datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER,
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data=res_pkt.data, in_port=port, actions=actions)
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datapath.send_msg(out)
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def _create_response(self, datapath, port, req):
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"""create a packet including LACP."""
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src = datapath.ports[port].hw_addr
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res_ether = ethernet.ethernet(
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slow.SLOW_PROTOCOL_MULTICAST, src, ether.ETH_TYPE_SLOW)
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res_lacp = self._create_lacp(datapath, port, req)
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res_pkt = packet.Packet()
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res_pkt.add_protocol(res_ether)
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res_pkt.add_protocol(res_lacp)
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res_pkt.serialize()
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return res_pkt
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def _create_lacp(self, datapath, port, req):
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"""create a LACP packet."""
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actor_system = datapath.ports[datapath.ofproto.OFPP_LOCAL].hw_addr
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res = slow.lacp(
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actor_system_priority=0xffff,
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actor_system=actor_system,
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actor_key=req.actor_key,
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actor_port_priority=0xff,
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actor_port=port,
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actor_state_activity=req.LACP_STATE_PASSIVE,
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actor_state_timeout=req.actor_state_timeout,
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actor_state_aggregation=req.actor_state_aggregation,
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actor_state_synchronization=req.actor_state_synchronization,
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actor_state_collecting=req.actor_state_collecting,
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actor_state_distributing=req.actor_state_distributing,
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actor_state_defaulted=req.LACP_STATE_OPERATIONAL_PARTNER,
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actor_state_expired=req.LACP_STATE_NOT_EXPIRED,
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partner_system_priority=req.actor_system_priority,
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partner_system=req.actor_system,
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partner_key=req.actor_key,
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partner_port_priority=req.actor_port_priority,
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partner_port=req.actor_port,
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partner_state_activity=req.actor_state_activity,
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partner_state_timeout=req.actor_state_timeout,
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partner_state_aggregation=req.actor_state_aggregation,
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partner_state_synchronization=req.actor_state_synchronization,
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partner_state_collecting=req.actor_state_collecting,
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partner_state_distributing=req.actor_state_distributing,
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partner_state_defaulted=req.actor_state_defaulted,
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partner_state_expired=req.actor_state_expired,
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collector_max_delay=0)
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self.logger.info("SW=%s PORT=%d LACP sent.",
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dpid_to_str(datapath.id), port)
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self.logger.debug(str(res))
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return res
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def _get_slave_enabled(self, dpid, port):
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"""get whether a slave i/f at some port of some datapath is
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enable or not."""
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slave = self._get_slave(dpid, port)
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if slave:
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return slave['enabled']
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else:
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return False
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def _set_slave_enabled(self, dpid, port, enabled):
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"""set whether a slave i/f at some port of some datapath is
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enable or not."""
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slave = self._get_slave(dpid, port)
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if slave:
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slave['enabled'] = enabled
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def _get_slave_timeout(self, dpid, port):
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"""get the timeout time at some port of some datapath."""
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slave = self._get_slave(dpid, port)
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if slave:
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return slave['timeout']
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else:
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return 0
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def _set_slave_timeout(self, dpid, port, timeout):
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"""set the timeout time at some port of some datapath."""
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slave = self._get_slave(dpid, port)
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if slave:
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slave['timeout'] = timeout
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def _get_slave(self, dpid, port):
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"""get slave i/f at some port of some datapath."""
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result = None
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for bond in self._bonds:
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if dpid in bond:
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if port in bond[dpid]:
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result = bond[dpid][port]
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break
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return result
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#-------------------------------------------------------------------
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# PRIVATE METHODS ( RELATED TO OPEN FLOW PROTOCOL )
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#-------------------------------------------------------------------
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def _add_flow_v1_0(self, src, port, timeout, datapath):
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"""enter a flow entry for the packet from the slave i/f
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with idle_timeout. for OpenFlow ver1.0."""
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ofproto = datapath.ofproto
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parser = datapath.ofproto_parser
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match = parser.OFPMatch(
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in_port=port, dl_src=addrconv.mac.text_to_bin(src),
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dl_type=ether.ETH_TYPE_SLOW)
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actions = [parser.OFPActionOutput(
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ofproto.OFPP_CONTROLLER, 65535)]
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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, idle_timeout=timeout,
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flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
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datapath.send_msg(mod)
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def _add_flow_v1_2(self, src, port, timeout, datapath):
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"""enter a flow entry for the packet from the slave i/f
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with idle_timeout. for OpenFlow ver1.2 and ver1.3."""
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ofproto = datapath.ofproto
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parser = datapath.ofproto_parser
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match = parser.OFPMatch(
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in_port=port, eth_src=src, eth_type=ether.ETH_TYPE_SLOW)
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actions = [parser.OFPActionOutput(
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ofproto.OFPP_CONTROLLER, ofproto.OFPCML_MAX)]
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inst = [parser.OFPInstructionActions(
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ofproto.OFPIT_APPLY_ACTIONS, actions)]
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mod = parser.OFPFlowMod(
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datapath=datapath, command=ofproto.OFPFC_ADD,
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idle_timeout=timeout, flags=ofproto.OFPFF_SEND_FLOW_REM,
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match=match, instructions=inst)
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datapath.send_msg(mod)
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#-------------------------------------------------------------------
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# PRIVATE METHODS ( OTHERS )
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#-------------------------------------------------------------------
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def _set_logger(self):
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"""change log format."""
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self.logger.propagate = False
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hdl = logging.StreamHandler()
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fmt_str = '[LACP][%(levelname)s] %(message)s'
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hdl.setFormatter(logging.Formatter(fmt_str))
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self.logger.addHandler(hdl)
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