def packet_in(event, packet_in_msg):
""" Process OpenFlow 1.0 PacketIn messages
Args:
event: PacketIN event
packet_in_msg: PacketIn msg
Return:
ethernet: PacketIn data
in_port: in_port
switch: OpenFlow datapath
0, 0, 0 if it is not a trace probe
"""
ethernet = Ethernet()
ethernet.unpack(packet_in_msg.data.value)
if settings.COLOR_VALUE in ethernet.source.value:
log.debug("OpenFlow 1.0 PacketIn Trace Msg Received")
in_port = packet_in_msg.in_port.value
switch = event.source.switch
return ethernet, in_port, switch
log.debug("PacketIn is not a Data Trace Probe")
return 0, 0, 0
def test_Ethernet_pack(self):
"""Test pack method of Ethernet class without VLAN tag."""
ethernet = Ethernet(destination='00:1f:3a:3e:9a:cf',
source='00:15:af:d5:38:98', ether_type=0x800,
data=b'testdata')
packed = ethernet.pack()
expected = b'\x00\x1f:>\x9a\xcf\x00\x15\xaf\xd58\x98\x08\x00testdata'
self.assertEqual(packed, expected)
def test_Tagged_Ethernet_pack(self):
"""Test pack method of Ethernet class including VLAN tag."""
ethernet = Ethernet(destination='00:1f:3a:3e:9a:cf',
source='00:15:af:d5:38:98', vlans=[VLAN(vid=200)],
ether_type=0x800, data=b'testdata')
packed = ethernet.pack()
expected = b'\x00\x1f:>\x9a\xcf\x00\x15\xaf\xd58'
expected += b'\x98\x81\x00\x00\xc8\x08\x00testdata'
self.assertEqual(packed, expected)
def _get_vlan_from_pkt(data):
""" Get VLAN ID from frame. Used for VLAN Translation
Args:
data: Ethernet Frame
Returns:
VLAN VID
"""
ethernet = Ethernet()
ethernet.unpack(data)
vlan = ethernet.vlans[0]
return vlan.vid
def _create_ethernet_frame(trace_entries, color):
""" Create an Ethernet frame using TraceEntries
and color (dl_src)
Args:
trace_entries: TraceEntries provided by user or collected from PacketIn
color: field and value that indicate the color
Returns:
ethernet frame
"""
ethernet = Ethernet()
ethernet.ether_type = trace_entries.dl_type
ethernet.source = color['color_value']
ethernet.destination = trace_entries.dl_dst
vlan = VLAN(vid=trace_entries.dl_vlan,
pcp=trace_entries.dl_vlan_pcp)
ethernet.vlans.append(vlan)
return ethernet
def update_links(self, message, source):
"""Dispatch 'reacheable.mac' event.
Args:
message: python openflow (pyof) PacketIn object.
source: kytos.core.switch.Connection instance.
Dispatch:
`reachable.mac`:
{
switch : <switch.id>,
port: <port.port_no>
reachable_mac: <mac_address>
}
"""
ethernet = Ethernet()
ethernet.unpack(message.data.value)
if ethernet.ether_type in (EtherType.LLDP, EtherType.IPV6):
return
try:
port = source.switch.get_interface_by_port_no(
message.in_port.value)
except AttributeError:
port = source.switch.get_interface_by_port_no(message.in_port)
name = 'kytos/of_core.reachable.mac'
content = {
'switch': source.switch,
'port': port,
'reachable_mac': ethernet.source.value
}
event = KytosEvent(name, content)
self.controller.buffers.app.put(event)
msg = 'The MAC %s is reachable from switch/port %s/%s.'
log.debug(msg, ethernet.source, source.switch.id, message.in_port)
def test_Tagged_Ethernet_unpack(self):
"""Test pack method of Ethernet class including VLAN tag."""
raw = b'\x00\x15\xaf\xd58\x98\x00\x1f:>'
raw += b'\x9a\xcf\x81\x00!^\x08\x00testdata'
expected = Ethernet(destination='00:15:af:d5:38:98',
source='00:1f:3a:3e:9a:cf', vlans=[VLAN(pcp=1,
vid=350)],
ether_type=0x800, data=b'testdata')
expected.pack()
unpacked = Ethernet()
unpacked.unpack(raw)
self.assertEqual(unpacked, expected)
def execute(self):
"""Send LLDP Packets every 'POLLING_TIME' seconds to all switches."""
switches = list(self.controller.switches.values())
for switch in switches:
try:
of_version = switch.connection.protocol.version
except AttributeError:
of_version = None
if not (switch.is_connected() and of_version in [0x01, 0x04]):
continue
for interface in switch.interfaces.values():
# Avoid ports with speed == 0
if interface.port_number == 65534:
continue
lldp = LLDP()
lldp.chassis_id.sub_value = DPID(switch.dpid)
port_type = UBInt16 if of_version == 0x01 else UBInt32
lldp.port_id.sub_value = port_type(interface.port_number)
ethernet = Ethernet()
ethernet.ether_type = EtherType.LLDP
ethernet.source = interface.address
ethernet.destination = constants.LLDP_MULTICAST_MAC
ethernet.data = lldp.pack()
packet_out = self.build_lldp_packet_out(
of_version, interface.port_number, ethernet.pack())
if packet_out is not None:
name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
content = {
'destination': switch.connection,
'message': packet_out
}
event_out = KytosEvent(name=name, content=content)
self.controller.buffers.msg_out.put(event_out)
log.debug("Sending a LLDP PacketOut to the switch %s",
switch.dpid)
def execute(self):
"""Implement a loop to check switches liveness."""
switches = list(self.controller.switches.values())
for switch in switches:
if not (switch.is_connected() and
switch.connection.protocol.version == 0x01):
continue
# Gerar lldp para cada uma das portas do switch
# Gerar o hash de cada um dos pacotes e armazenar
for port in switch.features.ports:
output_action = ActionOutput()
output_action.port = port.port_no
# Avoid ports with speed == 0
if port.port_no.value == 65534:
continue
ethernet = Ethernet()
ethernet.ether_type = constants.LLDP_ETHERTYPE
ethernet.source = port.hw_addr
ethernet.destination = constants.LLDP_MULTICAST_MAC
lldp = LLDP()
lldp.chassis_id.sub_value = DPID(switch.dpid)
lldp.port_id.sub_value = port.port_no
ethernet.data = lldp.pack()
packet_out = PacketOut()
packet_out.actions.append(output_action)
packet_out.data = ethernet.pack()
event_out = KytosEvent()
event_out.name = 'kytos/of_lldp.messages.out.ofpt_packet_out'
event_out.content = {'destination': switch.connection,
'message': packet_out}
self.controller.buffers.msg_out.put(event_out)
log.debug("Sending a LLDP PacketOut to the switch %s",
switch.dpid)
def execute(self):
"""Send LLDP Packets every 'POLLING_TIME' seconds to all switches."""
switches = list(self.controller.switches.values())
for switch in switches:
try:
of_version = switch.connection.protocol.version
except AttributeError:
of_version = None
if not switch.is_connected():
continue
if of_version == 0x01:
port_type = UBInt16
local_port = Port10.OFPP_LOCAL
elif of_version == 0x04:
port_type = UBInt32
local_port = Port13.OFPP_LOCAL
else:
# skip the current switch with unsupported OF version
continue
interfaces = list(switch.interfaces.values())
for interface in interfaces:
# Avoid the interface that connects to the controller.
if interface.port_number == local_port:
continue
lldp = LLDP()
lldp.chassis_id.sub_value = DPID(switch.dpid)
lldp.port_id.sub_value = port_type(interface.port_number)
ethernet = Ethernet()
ethernet.ether_type = EtherType.LLDP
ethernet.source = interface.address
ethernet.destination = constants.LLDP_MULTICAST_MAC
ethernet.data = lldp.pack()
# self.vlan_id == None will result in a packet with no VLAN.
ethernet.vlans.append(VLAN(vid=self.vlan_id))
packet_out = self._build_lldp_packet_out(
of_version, interface.port_number, ethernet.pack())
if packet_out is not None:
event_out = KytosEvent(
name='kytos/of_lldp.messages.out.ofpt_packet_out',
content={
'destination': switch.connection,
'message': packet_out
})
self.controller.buffers.msg_out.put(event_out)
log.debug("Sending a LLDP PacketOut to the switch %s",
switch.dpid)
msg = '\n'
msg += 'Switch: %s (%s)\n'
msg += ' Interfaces: %s\n'
msg += ' -- LLDP PacketOut --\n'
msg += ' Ethernet: eth_type (%s) | src (%s) | dst (%s)\n'
msg += ' LLDP: Switch (%s) | port (%s)'
log.debug(msg, switch.connection.address, switch.dpid,
switch.interfaces, ethernet.ether_type,
ethernet.source, ethernet.destination,
switch.dpid, interface.port_number)
def packet_in(self, event):
self.lock.acquire()
from pyof.v0x04.asynchronous.packet_in import PacketIn
msg = event.content['message']
assert isinstance(msg, PacketIn)
eth = Ethernet()
eth.unpack(msg.data.value)
#log.info('ethernet type=%s'%str(eth.ether_type))
switch = event.source.switch
in_port = msg.in_port
# if eth.ether_type != 35020:
# log.info('ethernet type=%s'%str(eth.ether_type))
if eth.ether_type == EtherType.IPV4:
ipv4 = IPv4()
ipv4.unpack(eth.data.value)
if ipv4.destination == '10.0.0.254':
pass
#only for host locate
# role = HOST_ROLE[ipv4.source]
# self.nodes[ipv4.source] = {'role': role}
#
# h_id = ipv4.source
# s_id = str(switch.dpid) + ":" + str(in_port)
#
# h2s_id = h_id + "+" + s_id
# s2h_id = s_id + "+" + h_id
# self.edges[h2s_id] = {'src': h_id, 'dst': s_id}
# self.edges[s2h_id] = {'src': s_id, 'dst': h_id}
# #TODO: need to handle host mobility
# print(self.nodes)
# print(self.edges)
# if not self.debug:
# pass # self.trident.set_topology(self.nodes, self.edges)
else:
sip = ipv4.source
dip = ipv4.destination
ipproto = ipv4.protocol
sport = None
dport = None
# allow_ip = ["10.0.0.1","10.0.0.2","10.0.0.3"]
# if sip not in allow_ip:
# return
# if dip not in allow_ip:
# return
allow_pair = [("10.0.0.2", "10.0.0.3"),
("10.0.0.2", "10.0.0.1")]
if (sip, dip) not in allow_pair:
self.lock.release()
return
if ipproto == 6:
ipproto = "tcp"
elif ipproto == 17:
ipproto = "udp"
else:
ipproto = "unknown"
if ipproto == "tcp":
tcph = unpack('!HHLLBBHHH', eth.data.value[20:40])
sport = tcph[0]
dport = tcph[1]
elif ipproto == "udp":
udph = unpack('!HHHH', eth.data.value[20:28])
sport = udph[0]
dport = udph[1]
else:
self.lock.release()
return
log.info("sip:" + str(sip) + "dip:" + str(dip) + str(ipproto) +
"sport" + str(sport) + "dport" + str(dport))
pkt = TridentPacket(sip, dip, sport, dport, ipproto)
if not self.debug:
log.info('start to call trident new_pkt')
self.trident.new_pkt(pkt)
self.lock.release()
def generate_trace_pkt(entries, color, r_id, my_domain):
""" Receives the REST/PUT to generate a PacketOut
data needs to be serialized.
Args:
entries:
color: result from Coloring Napp for a specific DPID
r_id:
my_domain:
Returns:
in_port:
pkt:
"""
trace = {}
switch = {}
eth = {}
ip = {}
tp = {}
# TODO Validate for dl_vlan. If empty, return error.
# Default values
dpid, in_port = 0, 65532
if color['color_field'] == 'dl_src':
dl_src = color['color_value']
else:
dl_src = '0e:55:05:0e:55:05'
dl_dst = "ca:fe:ca:fe:ca:fe"
dl_vlan, dl_type, dl_vlan_pcp = 100, 2048, 0
nw_src, nw_dst, nw_tos = '127.0.0.1', '127.0.0.1', 0
tp_src, tp_dst = 1, 1
try:
trace = entries['trace']
switch = trace['switch']
eth = trace['eth']
except:
pass
try:
ip = trace['ip']
except:
pass
try:
tp = trace['tp']
except:
pass
if len(switch) > 0:
dpid, in_port = prepare_switch(switch, dpid, in_port)
if len(eth) > 0:
dl_src, dl_dst, dl_vlan, dl_type, dl_vlan_pcp = prepare_ethernet(eth, dl_src, dl_dst,
dl_vlan, dl_type,
dl_vlan_pcp)
# if len(ip) > 0:
nw_src, nw_dst, nw_tos = prepare_ip(ip, nw_src, nw_dst, nw_tos)
# if len(tp) > 0:
tp_src, tp_dst = prepare_tp(tp, tp_src, tp_dst)
kethernet = Ethernet()
kethernet.ether_type = constants.VLAN
kethernet.source = dl_src
kethernet.destination = dl_dst
kvlan = VLAN(vid=int(dl_vlan), pcp=dl_vlan_pcp, ether_type=int(dl_type))
msg = TraceMsg(r_id, my_domain)
if int(dl_type) == constants.IPv4:
kip = IPv4()
kip.destination = nw_dst
kip.source = nw_src
# ip.protocol = 6
kip.data = dill.dumps(msg)
kvlan.data = kip.pack()
else:
kvlan.data = dill.dumps(msg)
kethernet.data = kvlan.pack()
pkt = kethernet.pack()
return in_port, pkt
def get_vlan_from_pkt(data):
ethernet = Ethernet()
ethernet.unpack(data)
return ethernet.vlan.vid
def handle_packet_in(self, event):
"""Handle PacketIn Event.
Install flows allowing communication between switch ports.
Args:
event (KytosPacketIn): Received Event
"""
log.debug("PacketIn Received")
packet_in = event.content['message']
ethernet = Ethernet()
ethernet.unpack(packet_in.data.value)
# Ignore LLDP packets or packets not generated by table-miss flows
if (ethernet.destination in settings.lldp_macs
or packet_in.reason != PacketInReason.OFPR_NO_MATCH):
return
# Learn the port where the sender is connected
in_port = packet_in.in_port
switch = event.source.switch
switch.update_mac_table(ethernet.source, in_port)
ports = switch.where_is_mac(ethernet.destination)
# Add a flow to the switch if the destination is known
if ports:
flow_mod = FlowMod()
flow_mod.command = FlowModCommand.OFPFC_ADD
flow_mod.priority = settings.flow_priority
match_dl_type = OxmTLV()
match_dl_type.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_TYPE
match_dl_type.oxm_value = ethernet.ether_type.value.to_bytes(
2, 'big')
flow_mod.match.oxm_match_fields.append(match_dl_type)
match_dl_src = OxmTLV()
match_dl_src.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_SRC
match_dl_src.oxm_value = ethernet.source.pack()
flow_mod.match.oxm_match_fields.append(match_dl_src)
match_dl_dst = OxmTLV()
match_dl_dst.oxm_field = OxmOfbMatchField.OFPXMT_OFB_ETH_DST
match_dl_dst.oxm_value = ethernet.destination.pack()
flow_mod.match.oxm_match_fields.append(match_dl_dst)
action = ActionOutput(port=ports[0])
instruction = InstructionApplyAction()
instruction.actions.append(action)
flow_mod.instructions.append(instruction)
event_out = KytosEvent(name=('kytos/of_l2ls.messages.out.'
'ofpt_flow_mod'),
content={
'destination': event.source,
'message': flow_mod
})
self.controller.buffers.msg_out.put(event_out)
# Send the packet to correct destination or flood it
packet_out = PacketOut()
packet_out.buffer_id = packet_in.buffer_id
packet_out.in_port = in_port
packet_out.data = packet_in.data
port = ports[0] if ports else PortNo.OFPP_FLOOD
out_action = ActionOutput(port=port)
packet_out.actions.append(out_action)
event_out = KytosEvent(name=('kytos/of_l2ls.messages.out.'
'ofpt_packet_out'),
content={
'destination': event.source,
'message': packet_out
})
self.controller.buffers.msg_out.put(event_out)
