def __init__(self, *args, **kwargs):
super(Topology, self).__init__(*args, **kwargs)
self.is_active = True
self.explicit_drop = True
self.ports = PortDataState()
self.links = _LinkState()
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
def __init__(self, *args, **kwargs):
super(L2Switch, self).__init__(*args, **kwargs)
self.name = 'switches'
self.dps = {} # datapath_id => Datapath class
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.is_active = True
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
self.link_discovery = True
def __init__(self, *args, **kwargs):
super(L2Switch, self).__init__(*args, **kwargs)
self.name = 'switches'
self.dps = {} # datapath_id => Datapath class
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.is_active = True
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
self.link_discovery = True
class Topology(LocalService):
_EVENTS = {EventPortAdd,
EventPortDelete,
EventPortModify,
EventLinkAdd,
EventLinkDelete}
"""
Ryu topology module ported to Local Controller
"""
DEFAULT_TTL = 64
LLDP_PACKET_LEN = len(LLDPPacket.lldp_packet(0, 0, DONTCARE_STR, 0))
LLDP_SEND_GUARD = .05
LLDP_SEND_PERIOD_PER_PORT = .9
TIMEOUT_CHECK_PERIOD = 5.
LINK_TIMEOUT = TIMEOUT_CHECK_PERIOD * 2
LINK_LLDP_DROP = 5
LLDP_PRIORITY = 0xFFFF
def __init__(self, *args, **kwargs):
super(Topology, self).__init__(*args, **kwargs)
self.is_active = True
self.explicit_drop = True
self.ports = PortDataState()
self.links = _LinkState()
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
def _port_added(self, port):
lldp_data = LLDPPacket.lldp_packet(
port.dpid, port.port_no, port.hw_addr, self.DEFAULT_TTL)
self.ports.add_port(port, lldp_data)
def _switch_enter(self, dp):
super(Topology, self)._switch_enter(dp)
self._init_flows()
ports = [Port(PortData(dp.id, port, dp.ofproto)) for port in
dp.ports.values()]
for port in ports:
if not port.is_reserved():
self._port_added(port)
self.ryuo.switch_enter(dp.id,
[port.port_data for port in self.ports.keys()])
self.lldp_event.set()
def _init_flows(self):
self._logger.info('Init flow table.')
self.ofctl.set_packet_in_flow(cookie=0, priority=self.LLDP_PRIORITY,
eth_type=ETH_TYPE_LLDP,
eth_dst=lldp.LLDP_MAC_NEAREST_BRIDGE)
def _switch_leave(self):
super(Topology, self)._switch_leave()
self.links.clear()
self.ports.clear()
def _get_port(self, port_no):
for port in self.ports.keys():
if port.port_no == port_no:
return port
def _report_port_added(self, port):
self.send_event_to_observers(EventPortAdd(port))
self.ryuo.port_added(port.port_data)
def _report_port_deleted(self, port):
self.send_event_to_observers(EventPortDelete(port))
self.ryuo.port_deleted(port.port_data)
def _report_port_modified(self, port):
self.send_event_to_observers(EventPortModify(port))
self.ryuo.port_modified(port.port_data)
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def _port_status_change(self, ev):
if self.dp is None:
return
msg = ev.msg
reason = msg.reason
dp = msg.datapath
ofpport = msg.desc
ofp = dp.ofproto
if reason == ofp.OFPPR_ADD:
self._logger.info('Port %d added.', ofpport.port_no)
port = Port(PortData(self.dp.id, ofpport, ofp))
if not port.is_reserved():
self._port_added(port)
self._report_port_added(port)
self.lldp_event.set()
elif reason == ofp.OFPPR_DELETE:
self._logger.info('Port %d deleted.', ofpport.port_no)
port = self._get_port(ofpport.port_no)
if port and not port.is_reserved():
del self.ports[Port(PortData(self.dp.id, ofpport))]
self._report_port_deleted(port)
self._link_down(port)
self.lldp_event.set()
else:
self._logger.info('Port %d modified.', ofpport.port_no)
port = self._get_port(ofpport.port_no)
port.lldp_reply = False
if port and not port.is_reserved():
port.modify(ofpport)
self._report_port_modified(port)
if self.ports.set_down(port):
self._link_down(port)
self.lldp_event.set()
def send_lldp_packet(self, port):
try:
port_data = self.ports.lldp_sent(port)
except KeyError as e:
# ports can be modified during our sleep in self.lldp_loop()
self._logger.warning('Missing port %d, %s.', port.port_no, e)
return
if port_data.is_down:
return
dp = self.dp
if dp is None:
# datapath was already deleted
self._logger.warning('Switch left.')
return
self.ofctl.send_packet_out(in_port=dp.ofproto.OFPP_CONTROLLER,
output=port.port_no,
data=port_data.lldp_data)
def lldp_loop(self):
while self.is_active:
self._logger.debug('LLDP loop')
self.lldp_event.clear()
now = time.time()
timeout = None
ports_now = []
ports = []
for (key, data) in self.ports.items():
if data.timestamp is None:
ports_now.append(key)
continue
expire = data.timestamp + self.LLDP_SEND_PERIOD_PER_PORT
if expire <= now:
ports.append(key)
continue
if timeout is None or timeout > expire - now:
timeout = expire - now
# break
for port in ports_now:
self.send_lldp_packet(port)
self._logger.debug('Sending LLDP to %d.%d',
port.dpid,
port.port_no)
for port in ports:
self.send_lldp_packet(port)
self._logger.debug('Sending LLDP to %d.%d',
port.dpid,
port.port_no)
hub.sleep(self.LLDP_SEND_GUARD) # don't burst
if timeout is not None and ports:
timeout = 0 # We have already slept
# LOG.debug('lldp sleep %s', timeout)
self.lldp_event.wait(timeout=timeout)
def _report_link_deleted(self, link):
self.send_event_to_observers(EventLinkDelete(link))
self.ryuo.link_deleted(link.src.port_data, link.dst.port_data)
def _report_link_added(self, link):
self.send_event_to_observers(EventLinkAdd(link))
self.ryuo.link_added(link.src.port_data, link.dst.port_data)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
self._logger.debug('Packet in')
msg = ev.msg
ofp = msg.datapath.ofproto
pkt = packet.Packet(msg.data)
headers = dict((p.protocol_name, p)
for p in pkt.protocols if type(p) != str)
src_mac = headers[ETHERNET].src
try:
src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
except LLDPPacket.LLDPUnknownFormat as e:
self._logger.debug('LLDPUnknownFormat %s', e)
return
dst_port_no = self.ofctl.get_packet_in_inport(msg)
dst = self._get_port(dst_port_no)
self._logger.debug('LLDP from %d.%d -> %d',
src_dpid,
src_port_no,
dst_port_no)
if not dst:
self._logger.warning('Dst not found.')
return
self.ports.lldp_received(dst)
src = Port(PortData(src_dpid, port_no=src_port_no, hw_addr=src_mac))
old_peer = self.links.get_peer(dst)
need_update = False
if old_peer and old_peer != src:
self._logger.info('Peer changed.')
self._report_link_deleted(Link(old_peer, dst))
need_update = True
link = Link(src, dst)
if link not in self.links:
need_update = True
self._report_link_added(Link(src, dst))
self.lldp_event.set()
# Always return false, since we don't have the reverse link information
if need_update:
self.links.update_link(src, dst)
self._logger.info('Update link %d.%d -> %d.%d',
src.dpid,
src.port_no,
dst.dpid,
dst.port_no)
def link_loop(self):
while self.is_active:
self.link_event.clear()
now = time.time()
deleted = []
for (link, timestamp) in self.links.items():
# LOG.debug('%s timestamp %d (now %d)', link, timestamp, now)
if timestamp + self.LINK_TIMEOUT < now:
src = link.src
if src in self.ports:
port_data = self.ports.get_port(src)
# LOG.debug('port_data %s', port_data)
if port_data.lldp_dropped() > self.LINK_LLDP_DROP:
deleted.append(link)
for link in deleted:
self.links.link_down(link)
# LOG.debug('delete %s', link)
self._report_link_deleted(link)
self.link_event.wait(timeout=self.TIMEOUT_CHECK_PERIOD)
def _link_down(self, port):
try:
src, rev_link_dst = self.links.dst_port_deleted(port)
self._logger.info('Link down: %d.%d -> %d.%d',
src.dpid,
src.port_no,
port.dpid,
port.port_no)
except KeyError:
self._logger.info('Cannot find peer of %d.%d',
port.dpid,
port.port_no)
return
self._report_link_deleted(Link(src, port))
def close(self):
self.is_active = False
self.lldp_event.set()
self.link_event.set()
super(Topology, self).close()
class L2Switch(RyuApp):
_EVENTS = [
event.EventSwitchEnter, event.EventSwitchLeave, event.EventPortAdd,
event.EventPortDelete, event.EventPortModify, event.EventLinkAdd,
event.EventLinkDelete, event.EventArpReceived
]
OFP_VERSIONS = [OFP_VERSION]
DEFAULT_TTL = 120 # unused. ignored.
LLDP_PACKET_LEN = len(LLDPPacket.lldp_packet(0, 0, DONTCARE_STR, 0))
LLDP_SEND_GUARD = .05
LLDP_SEND_PERIOD_PER_PORT = .9
TIMEOUT_CHECK_PERIOD = 15.
LINK_TIMEOUT = TIMEOUT_CHECK_PERIOD * 2
LINK_LLDP_DROP = 5
def __init__(self, *args, **kwargs):
super(L2Switch, self).__init__(*args, **kwargs)
self.name = 'switches'
self.dps = {} # datapath_id => Datapath class
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.is_active = True
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
self.link_discovery = True
def close(self):
self.is_active = False
if self.link_discovery:
self.lldp_event.set()
self.link_event.set()
hub.joinall(self.threads)
def lldp_loop(self):
while self.is_active:
self.lldp_event.clear()
now = time.time()
timeout = None
ports_now = []
ports = []
for (key, data) in self.ports.items():
if data.timestamp is None:
ports_now.append(key)
continue
expire = data.timestamp + self.LLDP_SEND_PERIOD_PER_PORT
if expire <= now:
ports.append(key)
continue
timeout = expire - now
break
for port in ports_now:
self.send_lldp_packet(port.dpid, port.port_no, port.hw_addr)
for port in ports:
self.send_lldp_packet(port.dpid, port.port_no, port.hw_addr)
hub.sleep(self.LLDP_SEND_GUARD) # don't burst
if timeout is not None and ports:
timeout = 0 # We have already slept
self.lldp_event.wait(timeout=timeout)
def link_loop(self):
while self.is_active:
self.link_event.clear()
now = time.time()
deleted = []
for (link, timestamp) in self.links.items():
if timestamp + self.LINK_TIMEOUT < now:
src = link.src
if src in self.ports:
port_data = self.ports.get_port(src)
if port_data.lldp_dropped() > self.LINK_LLDP_DROP:
deleted.append(link)
for link in deleted:
self.links.link_down(link)
self.send_event_to_observers(event.EventLinkDelete(link))
dst = link.dst
rev_link = Link(dst, link.src)
if rev_link not in deleted:
# It is very likely that the reverse link is also
# disconnected. Check it early.
expire = now - self.LINK_TIMEOUT
self.links.rev_link_set_timestamp(rev_link, expire)
if dst in self.ports:
self.ports.move_front(dst)
self.lldp_event.set()
self.link_event.wait(timeout=self.TIMEOUT_CHECK_PERIOD)
def _get_switch(self, dpid):
if dpid in self.dps:
switch = Switch(self.dps[dpid])
for ofpport in self.port_state[dpid].itervalues():
switch.add_port(ofpport)
return switch
def _get_port(self, dpid, port_no):
switch = self._get_switch(dpid)
if switch:
for p in switch.ports:
if p.port_no == port_no:
return p
def _port_added(self, port):
lldp_data = LLDPPacket.lldp_packet(port.dpid, port.port_no,
port.hw_addr, self.DEFAULT_TTL)
self.ports.add_port(port, lldp_data)
LOG.debug('_port_added dpid=%s, port_no=%s, live=%s', port.dpid,
port.port_no, port.is_live())
def _register(self, dp):
assert dp.id is not None
assert dp.id not in self.dps
self.dps[dp.id] = dp
self.port_state[dp.id] = PortState()
for port in dp.ports.values():
self.port_state[dp.id].add(port.port_no, port)
def _link_down(self, port):
try:
dst, rev_link_dst = self.links.port_deleted(port)
except KeyError:
# LOG.debug('key error. src=%s, dst=%s',
# port, self.links.get_peer(port))
return
link = Link(port, dst)
self.send_event_to_observers(event.EventLinkDelete(link))
if rev_link_dst:
rev_link = Link(dst, rev_link_dst)
self.send_event_to_observers(event.EventLinkDelete(rev_link))
self.ports.move_front(dst)
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def port_status_handler(self, ev):
msg = ev.msg
reason = msg.reason
dp = msg.datapath
ofpport = msg.desc
if reason == dp.ofproto.OFPPR_ADD:
LOG.debug(
'A port was added.' + '(datapath id = %s, port number = %s)',
dp.id, ofpport.port_no)
self.port_state[dp.id].add(ofpport.port_no, ofpport)
self.send_event_to_observers(
event.EventPortAdd(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
self._port_added(port)
self.lldp_event.set()
elif reason == dp.ofproto.OFPPR_DELETE:
LOG.debug(
'A port was deleted.' + '(datapath id = %s, port number = %s)',
dp.id, ofpport.port_no)
self.port_state[dp.id].remove(ofpport.port_no)
self.send_event_to_observers(
event.EventPortDelete(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
self.ports.del_port(port)
self._link_down(port)
self.lldp_event.set()
else:
assert reason == dp.ofproto.OFPPR_MODIFY
LOG.debug(
'A port was modified.' +
'(datapath id = %s, port number = %s)', dp.id, ofpport.port_no)
self.port_state[dp.id].modify(ofpport.port_no, ofpport)
self.send_event_to_observers(
event.EventPortModify(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
if self.ports.set_down(port):
self._link_down(port)
self.lldp_event.set()
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
"""Handle switch features reply to install table miss flow entries."""
datapath = ev.msg.datapath
self.install_table_miss(datapath, 0)
def create_match(self, parser, fields):
"""Create OFP match struct from the list of fields."""
match = parser.OFPMatch()
for a in fields:
match.append_field(*a)
return match
def send_barrier_request(self, datapath):
ofp_parser = datapath.ofproto_parser
req = ofp_parser.OFPBarrierRequest(datapath)
datapath.send_msg(req)
def send_lldp_packet(self, datapath_id, port_no, dl_addr):
datapath = self.dps.get(datapath_id, None)
if datapath is None:
#datapath was already deleted
return
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
lldp_data = LLDPPacket.lldp_packet(datapath.id, port_no, dl_addr,
self.DEFAULT_TTL)
output_port = parser.OFPActionOutput(port_no, ofproto.OFPCML_NO_BUFFER)
packet_out = parser.OFPPacketOut(datapath, ofproto.OFPP_ANY,
ofproto.OFPP_CONTROLLER,
[output_port], lldp_data)
datapath.send_msg(packet_out)
@set_ev_cls(ofp_event.EventOFPBarrierReply, MAIN_DISPATCHER)
def barrier_reply_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
self._register(datapath)
switch = self._get_switch(datapath.id)
self.send_event_to_observers(event.EventSwitchEnter(switch))
for port in switch.ports:
if not port.is_reserved():
self._port_added(port)
self.lldp_event.set()
def create_flow_mod(self, datapath, priority, table_id, match,
instructions):
"""Create OFP flow mod message."""
ofproto = datapath.ofproto
flow_mod = datapath.ofproto_parser.OFPFlowMod(
datapath, 0, 0, table_id, ofproto.OFPFC_ADD, 0, 0, priority,
ofproto.OFPCML_NO_BUFFER, ofproto.OFPP_ANY, OFPG_ANY, 0, match,
instructions)
return flow_mod
def install_table_miss(self, datapath, table_id):
"""Create and install table miss flow entries."""
parser = datapath.ofproto_parser
ofproto = datapath.ofproto
match = parser.OFPMatch()
match.set_dl_type(ETH_TYPE_LLDP)
output = parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
self.LLDP_PACKET_LEN)
write = parser.OFPInstructionActions(ofproto.OFPIT_WRITE_ACTIONS,
[output])
instructions = [write]
flow_mod = self.create_flow_mod(datapath, 0, table_id, match,
instructions)
datapath.send_msg(flow_mod)
self.send_barrier_request(datapath)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
"""Handle packet_in events."""
if not self.link_discovery:
return
msg = ev.msg
in_port = msg.match['in_port']
packet = Packet(msg.data)
efm = packet.get_protocol(ethernet.ethernet)
if efm.ethertype == ether.ETH_TYPE_ARP:
self.send_event_to_observers(event.EventArpReceived(ev))
try:
src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
except LLDPPacket.LLDPUnknownFormat as e:
# This handler can receive all the packtes which can be
# not-LLDP packet. Ignore it silently
return
else:
dst_dpid = msg.datapath.id
dst_port_no = in_port
src = self._get_port(src_dpid, src_port_no)
if not src or src.dpid == dst_dpid:
return
dst = self._get_port(dst_dpid, dst_port_no)
if not dst:
return
old_peer = self.links.get_peer(src)
#LOG.debug("Packet-In")
#LOG.debug(" src=%s", src)
#LOG.debug(" dst=%s", dst)
#LOG.debug(" old_peer=%s", old_peer)
if old_peer and old_peer != dst:
old_link = Link(src, old_peer)
self.send_event_to_observers(event.EventLinkDelete(old_link))
link = Link(src, dst)
if not link in self.links:
self.send_event_to_observers(event.EventLinkAdd(link))
if not self.links.update_link(src, dst):
# reverse link is not detected yet.
# So schedule the check early because it's very likely it's up
try:
self.ports.lldp_received(dst)
except KeyError as e:
# There are races between EventOFPPacketIn and
# EventDPPortAdd. So packet-in event can happend before
# port add event. In that case key error can happend.
# LOG.debug('lldp_received: KeyError %s', e)
pass
else:
self.ports.move_front(dst)
self.lldp_event.set()
class L2Switch(RyuApp):
_EVENTS = [event.EventSwitchEnter, event.EventSwitchLeave,
event.EventPortAdd, event.EventPortDelete,
event.EventPortModify,
event.EventLinkAdd, event.EventLinkDelete,
event.EventArpReceived]
OFP_VERSIONS = [OFP_VERSION]
DEFAULT_TTL = 120 # unused. ignored.
LLDP_PACKET_LEN = len(LLDPPacket.lldp_packet(0, 0, DONTCARE_STR, 0))
LLDP_SEND_GUARD = .05
LLDP_SEND_PERIOD_PER_PORT = .9
TIMEOUT_CHECK_PERIOD = 15.
LINK_TIMEOUT = TIMEOUT_CHECK_PERIOD * 2
LINK_LLDP_DROP = 5
def __init__(self, *args, **kwargs):
super(L2Switch, self).__init__(*args, **kwargs)
self.name = 'switches'
self.dps = {} # datapath_id => Datapath class
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.is_active = True
self.lldp_event = hub.Event()
self.link_event = hub.Event()
self.threads.append(hub.spawn(self.lldp_loop))
self.threads.append(hub.spawn(self.link_loop))
self.link_discovery = True
def close(self):
self.is_active = False
if self.link_discovery:
self.lldp_event.set()
self.link_event.set()
hub.joinall(self.threads)
def send_flow_stats_request(self, datapath):
ofp_parser = datapath.ofproto_parser
req = ofp_parser.OFPGroupDescStatsRequest(datapath, 0)
if datapath.id == 3:
datapath.send_msg(req)
@set_ev_cls(ofp_event.EventOFPGroupDescStatsReply, MAIN_DISPATCHER)
def flow_stats_reply_handler(self, ev):
descs = []
for stat in ev.msg.body:
descs.append('length=%d type=%d group_id=%d '
'buckets=%s' %
(stat.length, stat.type, stat.group_id,
stat.buckets))
LOG.debug('GroupDescStats: %s', descs)
def lldp_loop(self):
while self.is_active:
self.lldp_event.clear()
now = time.time()
timeout = None
ports_now = []
ports = []
for (key, data) in self.ports.items():
if data.timestamp is None:
ports_now.append(key)
continue
expire = data.timestamp + self.LLDP_SEND_PERIOD_PER_PORT
if expire <= now:
ports.append(key)
continue
timeout = expire - now
break
for port in ports_now:
self.send_lldp_packet(port.dpid,
port.port_no,
port.hw_addr)
for port in ports:
self.send_lldp_packet(port.dpid,
port.port_no,
port.hw_addr)
hub.sleep(self.LLDP_SEND_GUARD) # don't burst
if timeout is not None and ports:
timeout = 0 # We have already slept
self.lldp_event.wait(timeout=timeout)
def link_loop(self):
while self.is_active:
self.link_event.clear()
now = time.time()
deleted = []
for (link, timestamp) in self.links.items():
if timestamp + self.LINK_TIMEOUT < now:
src = link.src
if src in self.ports:
port_data = self.ports.get_port(src)
if port_data.lldp_dropped() > self.LINK_LLDP_DROP:
deleted.append(link)
#for dp in self.dps.values():
#self.send_flow_stats_request(dp)
for link in deleted:
self.links.link_down(link)
self.send_event_to_observers(event.EventLinkDelete(link))
dst = link.dst
rev_link = Link(dst, link.src)
if rev_link not in deleted:
# It is very likely that the reverse link is also
# disconnected. Check it early.
expire = now - self.LINK_TIMEOUT
self.links.rev_link_set_timestamp(rev_link, expire)
if dst in self.ports:
self.ports.move_front(dst)
self.lldp_event.set()
self.link_event.wait(timeout=self.TIMEOUT_CHECK_PERIOD)
def _get_switch(self, dpid):
if dpid in self.dps:
switch = Switch(self.dps[dpid])
for ofpport in self.port_state[dpid].itervalues():
switch.add_port(ofpport)
return switch
def _get_port(self, dpid, port_no):
switch = self._get_switch(dpid)
if switch:
for p in switch.ports:
if p.port_no == port_no:
return p
def _port_added(self, port):
lldp_data = LLDPPacket.lldp_packet(
port.dpid, port.port_no, port.hw_addr, self.DEFAULT_TTL)
self.ports.add_port(port, lldp_data)
LOG.debug('_port_added dpid=%s, port_no=%s, live=%s',
port.dpid, port.port_no, port.is_live())
def _register(self, dp):
assert dp.id is not None
assert dp.id not in self.dps
self.dps[dp.id] = dp
self.port_state[dp.id] = PortState()
for port in dp.ports.values():
self.port_state[dp.id].add(port.port_no, port)
def _link_down(self, port):
try:
dst, rev_link_dst = self.links.port_deleted(port)
except KeyError:
# LOG.debug('key error. src=%s, dst=%s',
# port, self.links.get_peer(port))
return
link = Link(port, dst)
self.send_event_to_observers(event.EventLinkDelete(link))
if rev_link_dst:
rev_link = Link(dst, rev_link_dst)
self.send_event_to_observers(event.EventLinkDelete(rev_link))
self.ports.move_front(dst)
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def port_status_handler(self, ev):
msg = ev.msg
reason = msg.reason
dp = msg.datapath
ofpport = msg.desc
if reason == dp.ofproto.OFPPR_ADD:
LOG.debug('A port was added.' +
'(datapath id = %s, port number = %s)',
dp.id, ofpport.port_no)
self.port_state[dp.id].add(ofpport.port_no, ofpport)
self.send_event_to_observers(
event.EventPortAdd(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
self._port_added(port)
self.lldp_event.set()
elif reason == dp.ofproto.OFPPR_DELETE:
LOG.debug('A port was deleted.' +
'(datapath id = %s, port number = %s)',
dp.id, ofpport.port_no)
self.port_state[dp.id].remove(ofpport.port_no)
self.send_event_to_observers(
event.EventPortDelete(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
self.ports.del_port(port)
self._link_down(port)
self.lldp_event.set()
else:
assert reason == dp.ofproto.OFPPR_MODIFY
LOG.debug('A port was modified.' +
'(datapath id = %s, port number = %s)',
dp.id, ofpport.port_no)
self.port_state[dp.id].modify(ofpport.port_no, ofpport)
self.send_event_to_observers(
event.EventPortModify(Port(dp.id, dp.ofproto, ofpport)))
if not self.link_discovery:
return
port = self._get_port(dp.id, ofpport.port_no)
if port and not port.is_reserved():
if self.ports.set_down(port):
self._link_down(port)
self.lldp_event.set()
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
"""Handle switch features reply to install table miss flow entries."""
datapath = ev.msg.datapath
self.install_table_miss(datapath, 0)
def create_match(self, parser, fields):
"""Create OFP match struct from the list of fields."""
match = parser.OFPMatch()
for a in fields:
match.append_field(*a)
return match
def send_barrier_request(self, datapath):
ofp_parser = datapath.ofproto_parser
req = ofp_parser.OFPBarrierRequest(datapath)
datapath.send_msg(req)
def send_lldp_packet(self, datapath_id, port_no, dl_addr):
datapath = self.dps.get(datapath_id, None)
if datapath is None:
#datapath was already deleted
return
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
lldp_data = LLDPPacket.lldp_packet(datapath.id,
port_no,
dl_addr,
self.DEFAULT_TTL)
output_port = parser.OFPActionOutput(port_no,
ofproto.OFPCML_NO_BUFFER)
packet_out = parser.OFPPacketOut(datapath, ofproto.OFPP_ANY,
ofproto.OFPP_CONTROLLER,
[output_port], lldp_data)
datapath.send_msg(packet_out)
@set_ev_cls(ofp_event.EventOFPBarrierReply, MAIN_DISPATCHER)
def barrier_reply_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
self._register(datapath)
switch = self._get_switch(datapath.id)
self.send_event_to_observers(event.EventSwitchEnter(switch))
for port in switch.ports:
if not port.is_reserved():
self._port_added(port)
self.lldp_event.set()
def create_flow_mod(self, datapath, priority,
table_id, match, instructions):
"""Create OFP flow mod message."""
ofproto = datapath.ofproto
flow_mod = datapath.ofproto_parser.OFPFlowMod(datapath, 0, 0, table_id,
ofproto.OFPFC_ADD, 0, 0,
priority,
ofproto.OFPCML_NO_BUFFER,
ofproto.OFPP_ANY,
OFPG_ANY, 0,
match, instructions)
return flow_mod
def install_table_miss(self, datapath, table_id):
"""Create and install table miss flow entries."""
parser = datapath.ofproto_parser
ofproto = datapath.ofproto
match = parser.OFPMatch()
match.set_dl_type(ETH_TYPE_LLDP)
output = parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
self.LLDP_PACKET_LEN)
write = parser.OFPInstructionActions(ofproto.OFPIT_WRITE_ACTIONS,
[output])
instructions = [write]
flow_mod = self.create_flow_mod(datapath, 0, table_id,
match, instructions)
datapath.send_msg(flow_mod)
self.send_barrier_request(datapath)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
"""Handle packet_in events."""
if not self.link_discovery:
return
msg = ev.msg
in_port = msg.match['in_port']
packet = Packet(msg.data)
efm = packet.next()
if efm.ethertype == ether.ETH_TYPE_ARP:
self.send_event_to_observers(event.EventArpReceived(ev))
try:
src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
except LLDPPacket.LLDPUnknownFormat as e:
# This handler can receive all the packtes which can be
# not-LLDP packet. Ignore it silently
return
else:
dst_dpid = msg.datapath.id
dst_port_no = in_port
src = self._get_port(src_dpid, src_port_no)
if not src or src.dpid == dst_dpid:
return
dst = self._get_port(dst_dpid, dst_port_no)
if not dst:
return
old_peer = self.links.get_peer(src)
#LOG.debug("Packet-In")
#LOG.debug(" src=%s", src)
#LOG.debug(" dst=%s", dst)
#LOG.debug(" old_peer=%s", old_peer)
if old_peer and old_peer != dst:
old_link = Link(src, old_peer)
self.send_event_to_observers(event.EventLinkDelete(old_link))
link = Link(src, dst)
if not link in self.links:
self.send_event_to_observers(event.EventLinkAdd(link))
if not self.links.update_link(src, dst):
# reverse link is not detected yet.
# So schedule the check early because it's very likely it's up
try:
self.ports.lldp_received(dst)
except KeyError as e:
# There are races between EventOFPPacketIn and
# EventDPPortAdd. So packet-in event can happend before
# port add event. In that case key error can happend.
# LOG.debug('lldp_received: KeyError %s', e)
pass
else:
self.ports.move_front(dst)
self.lldp_event.set()