openstack/os-ken
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459baf87d3
os-ken/ryu/controller/controller.py
Yoshihiro Kaneko 2eb59a09ff doc: add components page 
port from wiki.

dummy quantumclient is necessary to import ryu.app.quantum_adapter by
sphinx.ext.autodoc.

Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
2014-05-27 20:24:50 +09:00

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Python
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# Copyright (C) 2011, 2012 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2011, 2012 Isaku Yamahata <yamahata at valinux co jp>
#
# 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.
"""
The main component of OpenFlow controller.
- Handle connections from switches
- Generate and route events to appropriate entities like Ryu applications
"""
import contextlib
from ryu import cfg
import logging
from ryu.lib import hub
from ryu.lib.hub import StreamServer
import traceback
import random
import ssl
from socket import IPPROTO_TCP, TCP_NODELAY
import ryu.base.app_manager
from ryu.ofproto import ofproto_common
from ryu.ofproto import ofproto_parser
from ryu.ofproto import ofproto_protocol
from ryu.ofproto import ofproto_v1_0
from ryu.ofproto import nx_match
from ryu.controller import handler
from ryu.controller import ofp_event
from ryu.lib.dpid import dpid_to_str
LOG = logging.getLogger('ryu.controller.controller')
CONF = cfg.CONF
CONF.register_cli_opts([
cfg.StrOpt('ofp-listen-host', default='', help='openflow listen host'),
cfg.IntOpt('ofp-tcp-listen-port', default=ofproto_common.OFP_TCP_PORT,
help='openflow tcp listen port'),
cfg.IntOpt('ofp-ssl-listen-port', default=ofproto_common.OFP_SSL_PORT,
help='openflow ssl listen port'),
cfg.StrOpt('ctl-privkey', default=None, help='controller private key'),
cfg.StrOpt('ctl-cert', default=None, help='controller certificate'),
cfg.StrOpt('ca-certs', default=None, help='CA certificates')
])
class OpenFlowController(object):
def __init__(self):
super(OpenFlowController, self).__init__()
# entry point
def __call__(self):
# LOG.debug('call')
self.server_loop()
def server_loop(self):
if CONF.ctl_privkey is not None and CONF.ctl_cert is not None:
if CONF.ca_certs is not None:
server = StreamServer((CONF.ofp_listen_host,
CONF.ofp_ssl_listen_port),
datapath_connection_factory,
keyfile=CONF.ctl_privkey,
certfile=CONF.ctl_cert,
cert_reqs=ssl.CERT_REQUIRED,
ca_certs=CONF.ca_certs,
ssl_version=ssl.PROTOCOL_TLSv1)
else:
server = StreamServer((CONF.ofp_listen_host,
CONF.ofp_ssl_listen_port),
datapath_connection_factory,
keyfile=CONF.ctl_privkey,
certfile=CONF.ctl_cert,
ssl_version=ssl.PROTOCOL_TLSv1)
else:
server = StreamServer((CONF.ofp_listen_host,
CONF.ofp_tcp_listen_port),
datapath_connection_factory)
# LOG.debug('loop')
server.serve_forever()
def _deactivate(method):
def deactivate(self):
try:
method(self)
finally:
self.is_active = False
return deactivate
class Datapath(ofproto_protocol.ProtocolDesc):
def __init__(self, socket, address):
super(Datapath, self).__init__()
self.socket = socket
self.socket.setsockopt(IPPROTO_TCP, TCP_NODELAY, 1)
self.address = address
self.is_active = True
# The limit is arbitrary. We need to limit queue size to
# prevent it from eating memory up
self.send_q = hub.Queue(16)
self.xid = random.randint(0, self.ofproto.MAX_XID)
self.id = None # datapath_id is unknown yet
self.ports = None
self.flow_format = ofproto_v1_0.NXFF_OPENFLOW10
self.ofp_brick = ryu.base.app_manager.lookup_service_brick('ofp_event')
self.set_state(handler.HANDSHAKE_DISPATCHER)
def close(self):
self.set_state(handler.DEAD_DISPATCHER)
def set_state(self, state):
self.state = state
ev = ofp_event.EventOFPStateChange(self)
ev.state = state
self.ofp_brick.send_event_to_observers(ev, state)
# Low level socket handling layer
@_deactivate
def _recv_loop(self):
buf = bytearray()
required_len = ofproto_common.OFP_HEADER_SIZE
count = 0
while self.is_active:
ret = self.socket.recv(required_len)
if len(ret) == 0:
self.is_active = False
break
buf += ret
while len(buf) >= required_len:
(version, msg_type, msg_len, xid) = ofproto_parser.header(buf)
required_len = msg_len
if len(buf) < required_len:
break
msg = ofproto_parser.msg(self,
version, msg_type, msg_len, xid, buf)
# LOG.debug('queue msg %s cls %s', msg, msg.__class__)
if msg:
ev = ofp_event.ofp_msg_to_ev(msg)
self.ofp_brick.send_event_to_observers(ev, self.state)
dispatchers = lambda x: x.callers[ev.__class__].dispatchers
handlers = [handler for handler in
self.ofp_brick.get_handlers(ev) if
self.state in dispatchers(handler)]
for handler in handlers:
handler(ev)
buf = buf[required_len:]
required_len = ofproto_common.OFP_HEADER_SIZE
# We need to schedule other greenlets. Otherwise, ryu
# can't accept new switches or handle the existing
# switches. The limit is arbitrary. We need the better
# approach in the future.
count += 1
if count > 2048:
count = 0
hub.sleep(0)
@_deactivate
def _send_loop(self):
try:
while self.is_active:
buf = self.send_q.get()
self.socket.sendall(buf)
finally:
q = self.send_q
# first, clear self.send_q to prevent new references.
self.send_q = None
# there might be threads currently blocking in send_q.put().
# unblock them by draining the queue.
try:
while q.get(block=False):
pass
except hub.QueueEmpty:
pass
def send(self, buf):
if self.send_q:
self.send_q.put(buf)
def set_xid(self, msg):
self.xid += 1
self.xid &= self.ofproto.MAX_XID
msg.set_xid(self.xid)
return self.xid
def send_msg(self, msg):
assert isinstance(msg, self.ofproto_parser.MsgBase)
if msg.xid is None:
self.set_xid(msg)
msg.serialize()
# LOG.debug('send_msg %s', msg)
self.send(msg.buf)
def serve(self):
send_thr = hub.spawn(self._send_loop)
# send hello message immediately
hello = self.ofproto_parser.OFPHello(self)
self.send_msg(hello)
try:
self._recv_loop()
finally:
hub.kill(send_thr)
hub.joinall([send_thr])
#
# Utility methods for convenience
#
def send_packet_out(self, buffer_id=0xffffffff, in_port=None,
actions=None, data=None):
if in_port is None:
in_port = self.ofproto.OFPP_NONE
packet_out = self.ofproto_parser.OFPPacketOut(
self, buffer_id, in_port, actions, data)
self.send_msg(packet_out)
def send_flow_mod(self, rule, cookie, command, idle_timeout, hard_timeout,
priority=None, buffer_id=0xffffffff,
out_port=None, flags=0, actions=None):
if priority is None:
priority = self.ofproto.OFP_DEFAULT_PRIORITY
if out_port is None:
out_port = self.ofproto.OFPP_NONE
flow_format = rule.flow_format()
assert (flow_format == ofproto_v1_0.NXFF_OPENFLOW10 or
flow_format == ofproto_v1_0.NXFF_NXM)
if self.flow_format < flow_format:
self.send_nxt_set_flow_format(flow_format)
if flow_format == ofproto_v1_0.NXFF_OPENFLOW10:
match_tuple = rule.match_tuple()
match = self.ofproto_parser.OFPMatch(*match_tuple)
flow_mod = self.ofproto_parser.OFPFlowMod(
self, match, cookie, command, idle_timeout, hard_timeout,
priority, buffer_id, out_port, flags, actions)
else:
flow_mod = self.ofproto_parser.NXTFlowMod(
self, cookie, command, idle_timeout, hard_timeout,
priority, buffer_id, out_port, flags, rule, actions)
self.send_msg(flow_mod)
def send_flow_del(self, rule, cookie, out_port=None):
self.send_flow_mod(rule=rule, cookie=cookie,
command=self.ofproto.OFPFC_DELETE,
idle_timeout=0, hard_timeout=0, priority=0,
out_port=out_port)
def send_delete_all_flows(self):
rule = nx_match.ClsRule()
self.send_flow_mod(
rule=rule, cookie=0, command=self.ofproto.OFPFC_DELETE,
idle_timeout=0, hard_timeout=0, priority=0, buffer_id=0,
out_port=self.ofproto.OFPP_NONE, flags=0, actions=None)
def send_barrier(self):
barrier_request = self.ofproto_parser.OFPBarrierRequest(self)
self.send_msg(barrier_request)
def send_nxt_set_flow_format(self, flow_format):
assert (flow_format == ofproto_v1_0.NXFF_OPENFLOW10 or
flow_format == ofproto_v1_0.NXFF_NXM)
if self.flow_format == flow_format:
# Nothing to do
return
self.flow_format = flow_format
set_format = self.ofproto_parser.NXTSetFlowFormat(self, flow_format)
# FIXME: If NXT_SET_FLOW_FORMAT or NXFF_NXM is not supported by
# the switch then an error message will be received. It may be
# handled by setting self.flow_format to
# ofproto_v1_0.NXFF_OPENFLOW10 but currently isn't.
self.send_msg(set_format)
self.send_barrier()
def is_reserved_port(self, port_no):
return port_no > self.ofproto.OFPP_MAX
def datapath_connection_factory(socket, address):
LOG.debug('connected socket:%s address:%s', socket, address)
with contextlib.closing(Datapath(socket, address)) as datapath:
try:
datapath.serve()
except:
# Something went wrong.
# Especially malicious switch can send malformed packet,
# the parser raise exception.
# Can we do anything more graceful?
if datapath.id is None:
dpid_str = "%s" % datapath.id
else:
dpid_str = dpid_to_str(datapath.id)
LOG.error("Error in the datapath %s from %s", dpid_str, address)
raise
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