os-ken/ryu/lib/lacplib.py
Yuichi Ito e1ae103b78 lib: lacplib: correct comments
Signed-off-by: itoyuichi <ito.yuichi0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
2013-09-14 12:38:56 +09:00

334 lines
13 KiB
Python

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