def do_flow_mod(self, event=None):
"""
If the event is not specified, then issues a flow mod with random src
and dst ports; all the other fields will match against the trigger event
saved earlier. Does not issue pkt_out.
Otherwise, does a normal flow_mod.
"""
msg = of.ofp_flow_mod()
# Normal flow-mod
if event:
msg.match = of.ofp_match.from_packet(event.parse())
msg.actions.append(of.ofp_action_output(port=get_the_other_port(event.port)))
msg.buffer_id = event.ofp.buffer_id
# Save the trigger event for later matching.
if msg.match.tp_dst == TRIGGER_PORT:
with self.lock:
self.trigger_event = event
mylog('Received trigger event. Trigger event.parse() =', pretty_dict(dictify(event.parse())))
mylog('Installed flow:', pretty_dict(dictify(msg.match)))
# Special flow-mod that generates random source/dst ports.
else:
with self.lock:
assert self.trigger_event
trigger_packet = func_cache(self.trigger_event.parse)
msg.match = of.ofp_match.from_packet(trigger_packet)
msg.actions.append(of.ofp_action_output(port=get_the_other_port(self.trigger_event.port)))
msg.match.tp_dst = random.randint(10, 65000)
msg.match.tp_src = random.randint(10, 65000)
current_time = time.time()
with self.lock:
(count, start, _) = self.flow_mod_stat
if start is None: start = current_time
self.flow_mod_stat = (count + 1, start, current_time)
msg.idle_timeout = IDLE_TIMEOUT
msg.hard_timeout = HARD_TIMEOUT
if (not USE_LIMITER) or (USE_LIMITER and self.flow_mod_limiter.to_forward_packet()):
self._of_send(msg)
self.flow_mod_queue.put((current_time, event.parse()))
def _install_rule(self, event, packet, outport, tp_dst=None, idle_timeout=IDLE_TIMEOUT):
"""
Installs a rule for any incoming packet, doing what a learning switch
should do.
"""
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet)
msg.idle_timeout = idle_timeout
msg.hard_timeout = HARD_TIMEOUT
msg.actions.append(of.ofp_action_output(port=outport))
with exp_control.lock:
exp_control.flow_mod_count += 1
install_bogus_rules = exp_control.install_bogus_rules
# Install a rule with a randomly generated dest mac address that no
# one will ever match against.
if install_bogus_rules:
# mac_addr_list = ['0' + str(random.randint(1,9)) for _ in range(6)]
# msg.match.dl_src = EthAddr(':'.join(mac_addr_list))
msg.match.tp_dst = random.randint(10, 65000)
msg.match.tp_src = random.randint(10, 65000)
msg.buffer_id = event.ofp.buffer_id
mylog("Installing a bogus flow.")
# Create a rule that matches with the incoming packet. When buffer ID is
# specified, the flow mod command is automatically followed by a packet-
# out command.
elif tp_dst is None:
msg.buffer_id = event.ofp.buffer_id
with exp_control.lock:
exp_control.pkt_out_count += 1
mylog("installing flow for %s.%i -> %s.%i" % (packet.src, event.port, packet.dst, outport))
# Create a rule with a specific dest port.
else:
msg.match.tp_dst = tp_dst
mylog("Installing rule for tp_dst =", tp_dst)
current_time = time.time()
with exp_control.lock:
if exp_control.flow_mod_start_time is None:
exp_control.flow_mod_start_time = current_time
exp_control.flow_mod_end_time = current_time
mylog("Flow_mod:", pretty_dict(dictify(msg)))
self.connection.send(msg)
def _handle_command(self, sock):
try:
cmd_list = sock.recv()
except ConnectionClosed:
return False
if cmd_list[0] == 'GET':
# ['GET', 'name_of_attr'] -> value_obj
with self._lock:
ret = getattr(self._local_obj, cmd_list[1])
sock.send(ret)
elif cmd_list[0] == 'GETALL':
# ['GETALL'] -> obj's dict
with self._lock:
ret = pretty_dict(self._local_obj.__dict__)
sock.send(ret)
elif cmd_list[0] == 'SET':
# ['SET', 'name_of_attr', value_obj] -> 'OK'
with self._lock:
setattr(self._local_obj, cmd_list[1], cmd_list[2])
sock.send('OK')
elif cmd_list[0] == 'RESET':
# ['RESET'] -> 'OK'
self._reset_func()
sock.send('OK')
elif cmd_list[0] == 'RUN':
# ['RUN', 'func_name', 'param1', 'param2', ...] -> ret obj
func = getattr(self._local_obj, cmd_list[1])
ret = func(*cmd_list[2:])
sock.send(ret)
elif cmd_list[0] == 'EXIT':
os._exit(0)
elif cmd_list[0] == 'HELLO':
sock.send('Hi there!')
else:
raise RuntimeError('Bad command: %s' % cmd_list)
return True