def run(self):
"""Main loop
"""
while self.running:
if (len(self._events) == 0):
#Sleep for some time if nothing to do
time.sleep(self.sleep)
continue
else:
while (self._events.has_event_ready()):
(t, event) = self._events.get_next()
if ((t-time.time()) > self.tolerance):
output.warn("Event "+event.name+" scheduled for "+str(t)+\
" is being run at time "+str(time.time()),
self.__class__.__name__)
else:
output.vvdbg("Event "+event.name+" scheduled for "+str(t)+\
" is being run at time "+str(time.time()),
self.__class__.__name__)
self._dispatch_event(event)
ntime = self.sleep
if (len(self._events) > 0):
ntime = self._events.get_next_time() - time.time()
time.sleep(min(ntime, self.sleep))
def _process_outbound(self, pktin, intfs, iport, lointf):
"""Event handler for outbound ARP packets
@param pktin packet in event to handle
@param intfs dictionary of interfaces (with ip range)
@param iport port no of local interface
@param lointf local interface address (ip, mac)
@return false
"""
for portno, ipr in intfs.items():
if (ipr[0] & ipr[1]) == (pktin.match.nw_dst & ipr[1]):
flow = flows.exact_entry(pktin.match)
if flow.buffer_id != pktin.pktin.buffer_id:
output.warn("Buffered outbound ARP packet (cannot be rewritten properly)!", self.__class__.__name__)
else:
flow.add_output(portno)
ofpkt.dl_rewrite(pktin.dpkt, True, ipr[2])
ofpkt.nw_rewrite(pktin.dpkt, True, ipr[0])
self.get_conn().send(flow.get_packet_out().pack() + pktin.dpkt.pack())
output.vdbg(
"ARP to " + pu.ip_val2string(pktin.match.nw_dst) + " sent to port " + str(portno),
self.__class__.__name__,
)
return False
output.warn("ARP for " + pu.ip_val2string(pktin.match.nw_dst) + " unknown subnet", self.__class__.__name__)
return False
def dohandshake(self, msg):
"""Function to carry out handshake
Switch (hello) => hello + feature request
Switch (feature reply) => DONE
"""
if (msg.header.type == pyopenflow.OFPT_HELLO):
sendmsg = pyopenflow.ofp_hello()
self.send(sendmsg.pack())
sendmsg = pyopenflow.ofp_header()
sendmsg.type = pyopenflow.OFPT_FEATURES_REQUEST
self.send(sendmsg.pack())
elif (msg.header.type == pyopenflow.OFPT_FEATURES_REPLY):
switch_feature = pyopenflow.ofp_switch_features()
switch_feature.unpack(msg.message)
self.dpid = switch_feature.datapath_id
output.info("Connected to switch %x" % self.dpid,
self.__class__.__name__)
self.handshake = True
else:
output.warn("Handshake should not handle message type "+\
pyopenflow.ofp_type[msg.header.type],
self.__class__.__name__)
def __init__(self, sock, msg, stats_reply=None, reply=None):
"""Initialize
@param sock reference to socket
@param msg message
"""
ofcomm.message.__init__(self, sock, msg)
##Stats reply header
self.stats_reply = stats_reply
remaining = reply
if (self.stats_reply == None) or (remaining == None):
self.stats_reply = pyof.ofp_stats_reply()
remaining = self.stats_reply.unpack(msg)
##Flow stats of individual flows
self.flows = []
while (len(remaining) >= pyof.OFP_FLOW_STATS_BYTES):
flow = pyof.ofp_flow_stats()
flow.unpack(remaining)
self.unpack_actions(remaining[pyof.OFP_FLOW_STATS_BYTES:flow.length], flow.actions)
remaining = remaining[flow.length:]
self.flows.append(flow)
if (len(remaining) > 0):
output.warn("Flow stats reply is of irregular length with "+\
str(len(remaining))+" bytes remaining.",
self.__class__.__name__)
output.vdbg("Received "+str(len(self.flows))+" flow stats.",
self.__class__.__name__)
def _process_inbound(self, pktin, intfs, iport, lointf):
"""Event handler for inbound ARP packets
@param pktin packet in event to handle
@param intfs dictionary of interfaces (with ip range)
@param iport port no of local interface
@param lointf local interface address (ip, mac)
@return false
"""
try:
ipr = intfs[pktin.match.in_port]
except KeyError:
output.vdbg("ARP packet received on unknown/uninitialized interface", self.__class__.__name__)
return False
flow = flows.exact_entry(pktin.match)
if flow.buffer_id != pktin.pktin.buffer_id:
output.warn("Buffered inbound ARP packet (cannot be rewritten properly)!", self.__class__.__name__)
elif flow.match.nw_dst != ipr[0]:
output.vdbg("Inbound ARP packet not destined for this host, ignored.", self.__class__.__name__)
else:
flow.add_output(iport)
if pu.array2val(pktin.match.dl_dst) != 0xFFFFFFFFFFFF:
ofpkt.dl_rewrite(pktin.dpkt, False, lointf[1])
ofpkt.nw_rewrite(pktin.dpkt, False, lointf[0])
self.get_conn().send(flow.get_packet_out().pack() + pktin.dpkt.pack())
return False
def __init__(self, sock, msg):
"""Initialize
@param sock reference to socket
@param msg message
"""
ofcomm.message.__init__(self, sock, msg)
##Features struct
self.features = None
if (self.header.type == pyof.OFPT_FEATURES_REPLY):
self.features = pyof.ofp_switch_features()
r = self.features.unpack(msg)
while (len(r) >= pyof.OFP_PHY_PORT_BYTES):
p = pyof.ofp_phy_port()
r = p.unpack(r)
self.features.ports.append(p)
if (len(r) > 0):
output.warn("Features reply is of irregular length with "+\
str(len(r))+" bytes remaining.",
self.__class__.__name__)
output.dbg("Received switch features:\n"+\
self.features.show("\t"),
self.__class__.__name__)
def dns_select_intf(self, intfs):
"""Get which interface to send
@return port no to send flow on and None if nothing to choose from
"""
if len(intfs) == 0:
return None
if self.coin == None:
output.warn(
"No COIN server reference provided. Default to random choice of interface", self.__class__.__name__
)
return self.select_nth_intf(intfs, 1)
if self.coin.config["dns_select_interface"] == "random":
return self.random_select_intf(intfs)
elif self.coin.config["dns_select_interface"] == "round_robin":
return self.round_robin_select_intf(intfs)
elif self.coin.config["dns_select_interface"] == "bandwidth":
return self.bandwidth_select_intf(intfs)
elif isinstance(self.coin.config["dns_select_interface"], int):
return self.select_nth_intf(intfs, self.coin.config["dns_select_interface"])
else:
value = 1
try:
value = int(self.coin.config["dns_select_interface"])
self.coin.set_config("dns_select_interface", value)
except ValueError:
output.warn("Unknown selection configuration!", self.__class__.__name__)
return self.select_nth_intf(intfs, value)
def processevent(self, event):
"""Process event
@param event event to process
@return True
"""
if (isinstance(event, yapc.priv_callback)):
lastr = self.lastresult
r = self.get_stat()
output.vdbg(r)
if (lastr == None):
self._server.post_event(yapc.priv_callback(self), self.interval)
return True
for k,v in r.items():
for k2 in ["transmit", "receive"]:
try:
v[k2]["bps"] = (float(v[k2]["bytes"] - lastr[k][k2]["bytes"])*8.0/
(v["timestamp"]-lastr[k]["timestamp"]))
v[k2]["pps"] = (float(v[k2]["packets"] - lastr[k][k2]["packets"])/
(v["timestamp"]-lastr[k]["timestamp"]))
except KeyError:
output.warn("Interface "+str(k)+" is new or removed",
self.__class__.__name__)
self._server.post_event(yapc.priv_callback(self), self.interval)
return True
def order_cleanup(self, earlier_handler, later_handler):
"""Order handler for cleanup
Do so by moving earlier handler to be just before the later handler
@param earlier_handler handler that should process event earlier
@param later_handler handler that should process event later
"""
eindex = -1
if (earlier_handler in self.cleanups):
eindex = self.cleanups.index(earlier_handler)
else:
output.warn(earlier_handler.__class__.__name__+\
" did not register for a cleanup".
self.__class__.__name__)
return
lindex = -1
if (later_handler in self.cleanups):
lindex = self.cleanups.index(later_handler)
else:
output.warn(laterr_handler.__class__.__name__+\
" did not register for a cleanup",
self.__class__.__name__)
return
#Reorder
if (lindex < eindex):
self.cleanups.insert(lindex, self.cleanups.pop(eindex))
def __process_switch_json(self, event):
"""Process JSON messages for switch
@param event JSON message event for switch
"""
reply = {}
reply["type"] = "coin"
reply["subtype"] = "ovs"
if event.message["command"] == "add_if":
self.add_if(event.message["name"])
reply["executed"] = True
elif event.message["command"] == "del_if":
self.datapaths[COIN_DP_NAME].del_if(event.message["name"])
reply["executed"] = True
elif event.message["command"] == "get_interfaces":
dpidsl = mc.get(swstate.dp_features.DP_SOCK_LIST)
if dpidsl != None:
reply["interfaces"] = []
if len(dpidsl) > 1:
output.warn(str(len(dpidsl)) + " datapaths connected to COIN", self.__class__.__name__)
f = mc.get(dpidsl[0])
output.dbg("Updated switch features:\n" + f.show("\t"), self.__class__.__name__)
for p in f.ports:
reply["interfaces"].append(p.name)
else:
output.warn("No datapaths connected to COIN", self.__class__.__name__)
reply["error"] = "No datapath connected"
else:
reply["error"] = "Unknown command"
return reply
def eventname(self):
"""Provide name for event used to publish data
@return event name
"""
output.warn("eventname should overloaded",
self.__class__.__name__)
return None
def send(self, sock, msg):
"""Send message on socket
"""
try:
self.db[sock].send(msg)
except KeyError:
output.warn("Message dropped because socket is already closed",
self.__class__.__name__)
def send(self, msg):
"""Send dictionary as JSON message
"""
try:
self.sock.send(simplejson.dumps(msg))
output.dbg("Send message " + simplejson.dumps(msg), self.__class__.__name__)
except socket.error:
output.warn(str(self.sock) + " is broken, message is dropped!", self.__class__.__name__)
def processevent(self, event):
"""Process OpenFlow message for switch status
@param event OpenFlow message event to process
@return True
"""
if isinstance(event, ofevents.features_reply):
# Maintain list of datapath socket
key = self.get_key(event.sock)
dpidsl = mc.get(dp_features.DP_SOCK_LIST)
if dpidsl == None:
dpidsl = []
if key not in dpidsl:
dpidsl.append(key)
mc.set(dp_features.DP_SOCK_LIST, dpidsl)
# Maintain dp features in memcache
mc.set(key, event.features)
elif isinstance(event, ofevents.port_status):
# Port status
if event.header.type == pyof.OFPT_PORT_STATUS:
key = self.get_key(event.sock)
sw = mc.get(key)
if sw == None:
output.warn("Port status from unknown datapath", self.__class__.__name__)
else:
output.dbg("Received port status:\n" + event.port.show("\t"), self.__class__.__name__)
if event.port.reason == pyof.OFPPR_DELETE or event.port.reason == pyof.OFPPR_MODIFY:
for p in sw.ports:
if p.port_no == event.port.desc.port_no:
sw.ports.remove(p)
if event.port.reason == pyof.OFPPR_ADD or event.port.reason == pyof.OFPPR_MODIFY:
sw.ports.append(event.port.desc)
output.dbg("Updated switch features:\n" + sw.show("\t"), self.__class__.__name__)
mc.set(key, sw)
elif isinstance(event, comm.event):
# Socket close
if event.event == comm.event.SOCK_CLOSE:
key = self.get_key(event.sock)
sw = mc.get(key)
if sw != None:
output.info("Datapath %x leaves" % sw.datapath_id, self.__class__.__name__)
# Maintain list of datapath socket
dpidsl = mc.get(dp_features.DP_SOCK_LIST)
if dpidsl != None:
if key in dpidsl:
dpidsl.remove(key)
mc.set(dp_features.DP_SOCK_LIST, dpidsl)
# Remove features
mc.delete(key)
return True
def parse(self, entry_line):
"""Parse line
"""
i = entry_line.split()
if (len(i) == 3):
pass #Incomplete entry
elif (len(i) != 5):
output.warn("ARP entry line should have 5 items but "+str(len(i))+" found",
self.__class__.__name__)
else:
self.ip = i[0]
self.mac = i[2]
self.iface = i[4]
def get_conn(self):
"""Get connection
@return the one and only connection to send messages (None otherwise)
"""
if (len(self.conn.db) > 1):
output.warn("More than one connection to COIN!",
self.__class__.__name__)
for s,c in self.conn.db.items():
return c
return None
def del_if(self, intf):
"""Remove interface to datapath
@param intf name of interface
@return command's exit status
"""
if (intf in self.interfaces):
self.interfaces.remove(intf)
return cmd.run_cmd(DPCTL+" del-if "+self.name+" "+intf,
self.__class__.__name__)
else:
output.warn("Interface "+intf+" do not exist for deletion",
self.__class__.__name__)
def get_sw_feature(self):
"""Get switch description
@return switch features else None
"""
dpidsl = mc.get(swstate.dp_features.DP_SOCK_LIST)
if dpidsl != None:
if len(dpidsl) > 1:
output.warn(str(len(dpidsl)) + " datapaths connected to COIN", self.__class__.__name__)
f = mc.get(dpidsl[0])
return f
else:
return None
def add_row(self, row):
"""Add data to the table
@param row is a tuple of data
"""
if (len(row) == len(self.columns)):
output.vdbg("Add row :"+str(row))
self.data_cache.append(row)
if (len(self.data_cache) >= self.cache_size):
self.flush_cache()
else:
output.warn("Adding row "+str(row)+" with "+len(row)+" items"+\
" when there is "+len(self.columns)+" columns",
self.__class__.__name__)
def set(name, value, timeout=0):
"""Set key and value
@param name key name
@param value value to set key to
@param timeout timeout to expire data
"""
global memcache_mode
if memcache_mode == MEMCACHE_MODE["OFF"]:
return None
if name.find(" ") != -1:
output.warn("Memcache key cannot contain spaces", "memcache util")
return memcache_client.set(name, value, timeout)
def flush_cache(self, close=True):
"""Flush data in cache in database
"""
if (self.db == None):
output.warn("No database to flush data into",
self.__class__.__name__)
return
output.vdbg("Flush cache of "+str(len(self.data_cache))+" items",
self.__class__.__name__)
stmt = "?,"*len(self.columns)
self.db.executemany("INSERT INTO "+self.name+\
" VALUES ("+stmt[:-1]+")",
self.data_cache, close)
self.data_cache = []
def registereventhandler(self, eventname, handler):
"""Register handler for event
Event should be registered in order of calling
@param eventname name of event
@param handler handler function
"""
if (not isinstance(eventname, str)):
output.warn("Event name "+str(eventname)+" is not a string",
self.__class__.__name__)
return
#Register handler
if (eventname not in self._processors):
self._processors[eventname] = []
self._processors[eventname].append(handler)
def send(self, msg):
"""Send OpenFlow message
"""
header = pyopenflow.ofp_header()
if (len(msg) < len(header)):
output.warn("Cannot send OpenFlow of length "+str(len(msg)))
else:
remain = header.unpack(msg)
header.length = len(msg)
output.vdbg("Send message "+header.show().strip().replace("\n",";"),
self.__class__.__name__)
try:
self.sock.send(header.pack()+remain)
except socket.error:
output.warn("Broken pipe, message not sent",
self.__class__.__name__)
def update_sw_feature(self):
"""Update switch feature in memcache
"""
sf = self.switch.get_sw_feature()
if sf == None:
output.warn("No switch features!!!", self.__class__.__name__)
else:
output.dbg("Set switch feature as " + sf.show(), self.__class__.__name__)
mc.set(bridge.SW_FEATURE, sf)
iport = self.switch.if_name2dpid_port_mac(self.loif.switch_intf)[1]
if iport == None:
output.warn("No inner port!!!", self.__class__.__name__)
else:
output.dbg("Set inner port as " + str(iport), self.__class__.__name__)
mc.set(bridge.SW_INNER_PORT, iport)
def processevent(self, event):
"""Process OpenFlow and JSON messages
@param event event to handle
@return True
"""
if isinstance(event, ofevents.error):
#OpenFlow error
output.warn("Error of type "+str(event.error.type)+\
" code "+str(event.error.code),
self.__class__.__name__)
elif isinstance(event, jsoncomm.message):
#JSON messages
self.__processjson(event)
return True
def post_event(self, event, timedelta = 0):
"""Post event
@param event event to post
@param timedelta to wait before posting event
@return if successful
"""
#Check event is an event
if (not isinstance(event, yapc.event)):
output.warn(str(event)+"is not an event",
self.__class__.__name__)
if (timedelta == 0):
return self.__scheduler.post_event(event)
else:
return self.__timedscheduler.post_event(event,
timedelta+time.time())
def parse(self, entry_line):
"""Parse line
"""
i = entry_line.split()
if (len(i) != 8):
output.warn("Route entry line should have 8 items but "+str(len(i))+" found",
self.__class__.__name__)
return
else:
self.destination = i[0]
self.gateway = i[1]
self.mask = i[2]
self.flags.parse(i[3])
self.metric = int(i[4])
self.ref = int(i[5])
self.use = int(i[6])
self.iface = i[7]
def set_priority(self, priority):
"""Set priority of flow entry
Priority can be expressed as number or
one of the following string expressed in yapc.openflowutil
@param priority expression of priority
@return success
"""
if isinstance(priority, int):
self.priority = priority
elif priority in ofutil.PRIORITY:
self.priority = ofutil.PRIORITY[priority]
else:
output.warn("Unknown expression of priority " + str(priority), self.__class__.__name__)
return False
return True
def post_event(self, event, clock):
"""Post event
@param event event to post
@param clock time to post event
@return success status
"""
if (clock > (time.time()+self.sleep)):
self._events.add(event, clock)
output.vvdbg("Added event "+event.name+" for time "+str(clock),
self.__class__.__name__)
return True
else:
output.warn("Cannot add event "+event.name+\
" shorter than "+str(self.sleep)+\
" before execution time",
self.__class__.__name__)
return False
def unpack_actions(self, string, actions=None):
"""Unpack actions
@param string string with actions encoded
@param actions list to add actions into
@return list of actions
"""
remaining = string
if (actions == None):
actions = []
while (len(remaining) >= pyof.OFP_ACTION_HEADER_BYTES):
(action, remaining) = self.unpack_action(remaining)
actions.append(action)
if (len(remaining) > 0):
output.warn("Action array is of irregular length with "+\
str(len(remaining))+" bytes remaining.",
self.__class__.__name__)
return actions
