def __init__(self, *args, **kwargs):
super(SimpleMonitor, self).__init__(*args, **kwargs)
self.is_active = True
#Topology Discovery
self.link_discovery = True
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.link_length = 0
self.switch_ports = {}
self.dpid_to_ip = map_switch_dpid()
#NPS SDN Specific Dictionary##################################################
self.dpid_to_node = {0x00012c59e5107640:1, 0x0001c4346b94a200:2,\
0x0001c4346b99dc00:4, 0x0001c4346b946200:5,\
0x0001c4346b971ec0:6, 0x0001f0921c219d40:13}
##############################################################################
self.active_ips = {}
self.arp_table = {}
#SDN Application data structures
self.blacklist = []
self.throttle_list = []
#SDN Application Flags
#This call assigns self.analyze, self.topology,
#and self.fingerprint and sets up those apps
self._n_fingerprint = True
self._n_topology = True
self._n_analyze = True
self._load_settings()
#Listen for a signal that tells the controller to update
#its settings. This is really tempramental.
#signal.signal(signal.SIGUSR1, self._load_settings)
self.threads.append(hub.spawn(self._monitor))
self.threads.append(hub.spawn(self._listener))
self.throttle_list = []
class SimpleMonitor(Routing.SimpleSwitch):
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_PACKET_LEN = len(LLDPPacket.lldp_packet(0, 0, DONTCARE_STR, 0))
DEFAULT_TTL = 120
def __init__(self, *args, **kwargs):
super(SimpleMonitor, self).__init__(*args, **kwargs)
self.is_active = True
#Topology Discovery
self.link_discovery = True
self.port_state = {} # datapath_id => ports
self.ports = PortDataState() # Port class -> PortData class
self.links = LinkState() # Link class -> timestamp
self.link_length = 0
self.switch_ports = {}
self.dpid_to_ip = map_switch_dpid()
#NPS SDN Specific Dictionary##################################################
self.dpid_to_node = {0x00012c59e5107640:1, 0x0001c4346b94a200:2,\
0x0001c4346b99dc00:4, 0x0001c4346b946200:5,\
0x0001c4346b971ec0:6, 0x0001f0921c219d40:13}
##############################################################################
self.active_ips = {}
self.arp_table = {}
#SDN Application data structures
self.blacklist = []
self.throttle_list = []
#SDN Application Flags
#This call assigns self.analyze, self.topology,
#and self.fingerprint and sets up those apps
self._n_fingerprint = True
self._n_topology = True
self._n_analyze = True
self._load_settings()
#Listen for a signal that tells the controller to update
#its settings. This is really tempramental.
#signal.signal(signal.SIGUSR1, self._load_settings)
self.threads.append(hub.spawn(self._monitor))
self.threads.append(hub.spawn(self._listener))
self.throttle_list = []
def _load_settings(self, signal=None, frame=None):
print("Loading the settings file")
with open("control_node_settings", "r") as f:
for line in f.readlines():
exec(line)
# If the fingerprint app is checked to run and has not been run yet,
# then do all the following.
if self.fingerprint and self._n_fingerprint:
self._n_fingerprint = False
self.fingerprints = {}
self.fingerprint_list = createFingerPrintList('fingerprint.xml')
self.cluster = Cluster()
self.session = self.cluster.connect('fingerprints')
db = self.session.execute_async("select * from fpspat")
for row in db.result():
mac_addr = row.mac
self.fingerprints[mac_addr] = {'ip':row.ip, 'os':row.os,\
'switch':row.switch, 'port':row.port,\
'hostname':row.hostname, 'history':row.history}
print("Downloaded Fingerprint Database \n")
if self.analyze and self._n_analyze:
self.analyzer = Analyzer()
self._n_analyze = False
with open('V','w') as f:
f.flush()
with open('D','w') as f:
f.flush()
with open('L','w') as f:
f.flush()
if self.topology and self._n_topology:
self._n_topology = False
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 _listener(self):
"""
This function will continuously open a file
named 'commands' and execute each line in
that file and then clear the file. If a
command fails, then the file is not cleared,
so be wary of that.
"""
while True:
with open("commands", "r") as f:
for line in f.readlines():
exec(line)
with open("commands", "w") as f:
f.flush()
hub.sleep(2)
def _monitor(self):
"""
Runs the monitor app which collects data from the network.
Will only run if "analyze" is clicked on the GUI's
splash screen.
"""
if self.topology:
while self.dpids == {}:
print("Waiting for live datapaths")
hub.sleep(2)
#self.map_hosts()
while True:
if self.analyze:
for dp in self.dpids:
if dp in self.dpid_to_node:
self._request_port_stats(self.dpids[dp])
if self.topology:
self.draw_graph(1, draw=True)
hub.sleep(2)
##################################
# ARP and ICMP Packet Handlers #
##################################
def _handle_arp_rq(self, dst_ip):
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=0x806,\
dst='ff:ff:ff:ff:ff:ff',\
src=self.hw_addr))
pkt.add_protocol(arp.arp(opcode=arp.ARP_REQUEST,\
src_mac=self.hw_addr,\
src_ip=self.ip_addr,\
dst_mac='00:00:00:00:00:00',\
dst_ip=dst_ip))
self._flood_packet(pkt)
def _handle_icmp_reply(self, pkt_icmp, pkt_ipv4, datapath):
if pkt_icmp.type != icmp.ICMP_ECHO_REPLY: return
if pkt_ipv4.dst != self.ip_addr:
print(pkt_ipv4.dst, self.ip_addr)
return
print("------------------------")
print("PING RECEIVED THANK GOD")
print(pkt_ipv4.src)
print(pkt_ipv4.dst)
print(datapath.id)
print("------------------------")
#Finish ARP redesignation
def _handle_arp_reply(self, pkt_arp, port, dpid):
if pkt_arp.opcode == arp.ARP_REPLY and pkt_arp.dst_mac == self.hw_addr:
if pkt_arp.src_ip not in self.active_ips:
print("ARP from " + pkt_arp.src_ip + "\n")
self.active_ips[pkt_arp.src_ip] = [dpid, port]
self.arp_table[pkt_arp.src_ip] = pkt_arp.src_mac
if self.topology:
self.draw_graph(1, draw=True)
if pkt_arp.opcode == arp.ARP_REQUEST and pkt_arp.src_ip != self.ip_addr:
#print("ARP Reqest from: " + pkt_arp.src_mac + " requesting: " + pkt_arp.dst_ip)
if pkt_arp.dst_ip not in self.arp_table: return
#construct and send ARP reply
reply_pkt = packet.Packet()
reply_pkt.add_protocol(ethernet.ethernet(ethertype=0x806,\
dst=pkt_arp.src_mac,\
src=self.arp_table[pkt_arp.dst_ip]))
reply_pkt.add_protocol(arp.arp(opcode=arp.ARP_REPLY,\
src_mac=self.arp_table[pkt_arp.dst_ip],\
src_ip=pkt_arp.dst_ip,\
dst_mac=pkt_arp.src_mac,\
dst_ip=pkt_arp.src_ip))
print("Responded to ARP Request: " )
print("Gave [" + pkt_arp.src_mac + "," + pkt_arp.src_ip + "]" +\
"[" + pkt_arp.dst_ip + "," + self.arp_table[pkt_arp.dst_ip] + "]")
self._send_packet(reply_pkt, self.dpids[int(dpid, 16)])
#############################
# How to send out packets #
#############################
def _flood_packet(self, pkt):
for dpid in self.dpids:
datapath = self.dpids[dpid]
ofproto = datapath.ofproto
actions = [datapath.ofproto_parser.OFPActionOutput(ofproto.OFPP_FLOOD)]
pkt.serialize()
out = datapath.ofproto_parser.OFPPacketOut(datapath=datapath, buffer_id=0xffffffff,\
in_port=ofproto.OFPP_CONTROLLER, actions=actions,\
data=pkt.data)
datapath.send_msg(out)
def _send_packet(self, pkt, datapath=None):
#Pick a random datapath to send from
if not datapath:
datapath = self.dpids[self.dpids.keys()[randint(0,len(self.dpids)-1)]]
ofproto = datapath.ofproto
pkt.serialize()
ether_pkt = pkt.get_protocol(ethernet.ethernet)
if ether_pkt.dst in self.mac_to_port[datapath.id]:
print("Sending packet out: " + `self.mac_to_port[datapath.id][ether_pkt.dst]`)
actions = [datapath.ofproto_parser.OFPActionOutput(self.mac_to_port[datapath.id]\
[ether_pkt.dst])]
out = datapath.ofproto_parser.OFPPacketOut(datapath=datapath, buffer_id=0xffffffff,\
in_port=ofproto.OFPP_CONTROLLER, actions=actions,\
data=pkt.data)
datapath.send_msg(out)
##########################
# How to draw a graph #
#########################
def draw_graph(self, timeout, draw=False):
"""
This function does the actual drawing of the
network topology.
"""
G = nx.Graph()
plt.clf()
labels = {}
nodes = []
host_nodes = []
for id in self.dpids:
G.add_node(hex(id))
labels[hex(id)] = hex(id)
nodes.append(hex(id))
for link in self.links:
G.add_edge(hex(link.src.dpid), hex(link.dst.dpid))
for ip in self.active_ips:
if ip not in host_nodes:
G.add_node(ip)
G.add_edge(self.active_ips[ip][0], ip)
host_nodes.append(ip)
self.graph = G.copy()
pos = nx.spring_layout(G)
G = nx.Graph()
if draw:
nx.draw(G)
nx.draw_networkx_nodes(G, pos, nodelist=nodes, node_color='FireBrick',\
node_size=500, alpha=0.8)
nx.draw_networkx_nodes(G, pos, nodelist=host_nodes, node_color='DarkGoldenRod',\
node_size=200, alpha=0.8)
for link in self.links:
G.add_edge(hex(link.src.dpid), hex(link.dst.dpid))
for ip in self.active_ips:
G.add_edge(self.active_ips[ip][0],ip)
nx.draw_networkx_edges(G, pos)
plt.pause(timeout)
##########################
# How to create a flow #
##########################
def _create_icmp_flow(self,datapath):
ofproto = datapath.ofproto
ofproto_parser = datapath.ofproto_parser
nw_dst = struct.unpack('!I', ipv4_to_bin(self.ip_addr))[0]
match = datapath.ofproto_parser.OFPMatch(dl_type=0x800, nw_dst=nw_dst)
actions = [datapath.ofproto_parser.OFPActionOutput(ofproto.OFPP_CONTROLLER)]
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0, command=ofproto.OFPFC_ADD,
idle_timeout=0, hard_timeout=0, actions=actions,
priority=0xFFFF)
datapath.send_msg(mod)
def _create_lldp_flow(self, datapath):
ofproto = datapath.ofproto
ofproto_parser = datapath.ofproto_parser
if ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
#Add LLDP Rule
match = datapath.ofproto_parser.OFPMatch(dl_type=0x88cc)
actions = [datapath.ofproto_parser.OFPActionOutput(ofproto.OFPP_CONTROLLER)]
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0, command=ofproto.OFPFC_ADD,
idle_timeout=0, hard_timeout=0, actions=actions,
priority=0xFFFF)
datapath.send_msg(mod)
def _create_arp_flow(self, datapath):
ofproto = datapath.ofproto
ofproto_parser = datapath.ofproto_parser
match = datapath.ofproto_parser.OFPMatch(dl_type=0x0806)
actions = [datapath.ofproto_parser.OFPActionOutput(ofproto.OFPP_CONTROLLER)]
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0, command=ofproto.OFPFC_ADD,
idle_timeout=0, hard_timeout=0, actions=actions,
priority=0xFFFF)
datapath.send_msg(mod)
###################################
# How to use Ryu Event Handlers #
###################################
@set_ev_cls(ofp_event.EventOFPStateChange,
[MAIN_DISPATCHER, DEAD_DISPATCHER])
def _state_change_handler(self, ev):
datapath = ev.datapath
if ev.state == MAIN_DISPATCHER:
dp_multiple_conns = False
if datapath.id in self.dpids:
dp_multiple_conns = True
self.logger.debug('register datapath: %016x', datapath.id)
print("New DPID: " + hex(datapath.id))
self._register(datapath)
switch = self._get_switch(datapath.id)
if not dp_multiple_conns:
self.send_event_to_observers(event.EventSwitchEnter(switch))
self._create_lldp_flow(datapath)
self._create_arp_flow(datapath)
self._create_icmp_flow(datapath)
if not dp_multiple_conns:
for port in switch.ports:
if not port.is_reserved():
self._port_added(port)
elif ev.state == DEAD_DISPATCHER:
switch = self._get_switch(datapath.id)
if datapath.id in self.dpids:
self.logger.debug('unregister datapath: %016x', datapath.id)
self._unregister(datapath)
self.send_event_to_observers(event.EventSwitchLeave(switch))
for port in switch.ports:
if not port.is_reserved():
self.ports.del_port(port)
self._link_down(port)
if self.topology:
self.lldp_event.set()
@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:
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:
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
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.EventOFPPortStatsReply, MAIN_DISPATCHER)
def _port_stats_reply_handler(self, ev):
timestamp = datetime.now()
self.analyzer.analyze(ev, timestamp.second + (timestamp.microsecond * 1e-6))
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def app_packet_in_handler(self, ev):
msg = ev.msg
pkt = packet.Packet(msg.data)
pkt_dhcp = pkt.get_protocol(dhcp.dhcp)
pkt_arp = pkt.get_protocol(arp.arp)
pkt_icmp = pkt.get_protocol(icmp.icmp)
pkt_ipv4 = pkt.get_protocol(ipv4.ipv4)
if pkt_icmp:
self._handle_icmp_reply(pkt_icmp, pkt_ipv4, msg.datapath)
if pkt_arp:
self._handle_arp_reply(pkt_arp, ev.msg.in_port, hex(msg.datapath.id))
if self.fingerprint:
if pkt_dhcp:
print("----------------------------------")
print(pkt_dhcp.yiaddr)
print(pkt_dhcp.op)
print("----------------------------------")
self._dhcp_handler(msg)
if self.topology:
self._lldp_handler(msg)
#######################
# DHCP Fingerprints #
#######################
def _dhcp_handler(self, msg):
"""
Takes a DHCP packet and parses it for MAC, IP, Switch, Port, Options
Using the options, this function checks those options against a
fingerprint database in order to guess the operating system used
by the host. Afterwards, it stores that information in a
Cassandra database.
"""
dpid = hex(msg.datapath.id)
pkt = msg.data
try:
source_mac, parsedPacket = dhcp_parse(pkt)
except TypeError:
return
hitlist = compare(self.fingerprint_list,parsedPacket)
hostname = get_dhcp_option_value(parsedPacket[12], 12)
option53 = get_dhcp_option_value(parsedPacket[12], 53)
option60 = get_dhcp_option_value(parsedPacket[12], 60)
if option53:
dhcptype = dhcp_types[option53]
if dhcptype != "Discover" and dhcptype != "Request":
print("Not a request of discover packets, so ignoring")
return
if parsedPacket[2]:
source_ip = hex_to_ip(hex(parsedPacket[2]))
elif parsedPacket[16]:
source_ip = hex_to_ip(hex(parsedPacket[16]))
elif get_dhcp_option_value(parsedPacket[12], 50):
source_ip = map(ord, get_dhcp_option_value(parsedPacket[12], 50))
source_ip = '.'.join(str(x) for x in source_ip)
else:
source_ip = None
mac = hex_to_mac(source_mac)
### NPS CCW Specific Network ###
location = DPIDToLocation(dpid)#
port = str(msg.in_port) #
################################
if mac not in self.fingerprints:
print("New fingerprint")
print "Source MAC: {}".format(mac)
print "IP Address: {}".format(source_ip)
print "Location : {}".format(location)
print "Host name : {}".format(hostname)
print "DHCP Type : {}".format(dhcptype)
mac_history = ["[%s, %s, %s, %s, %s]" % (source_ip, hitlist[0][0],\
location, port, hostname)]
self.fingerprints[mac] = {'ip':source_ip, 'os':hitlist[0][0],\
'switch':location, 'port':port,\
'hostname':hostname, 'history':mac_history}
command = "insert into fpspat (MAC, IP, OS, Switch, Port, Hostname,\
Time, History) values ('{0}', '{1}', '{2}', '{3}', '{4}',\
'{5}', '{6}', {7})".format(mac, source_ip, hitlist[0][0],\
location, port, hostname, str(datetime.now()),\
mac_history)
self.session.execute(command)
fp = self.fingerprints[mac]
changes = []
time = str(datetime.now())
for prop,val in [('ip', source_ip), ('os', hitlist[0][0]),('hostname', hostname)]:
if fp[prop] != val:
print("The " + prop + " changed")
changes.append("[" + fp[prop] + " changed to " + val + " at time " + time + "]")
fp[prop] = val
command = "update fpspat set " + prop + " = " + `val` + " where MAC = " + `mac`
print(command)
self.session.execute(command)
if changes:
print("Database updated to reflect changes")
fp['history'] += changes
print(fp['history'])
command = "update fpspat set History = '{0}' where MAC= '{1}'".format(str(fp['history']),\
str(mac))
self.session.execute(command)
#######################################
# LLDP Portion - Topology Detection #
#######################################
def close(self):
self.is_active = False
if self.link_discovery:
self.lldp_event.set()
self.link_event.set()
hub.joinall(self.threads)
def _register(self, dp):
"""
Takes the datapath and registers
it as a switch. This is how
the controller represents the
switches.
"""
assert dp.id is not None
self.dpids[dp.id] = dp
if dp.id not in self.port_state:
self.port_state[dp.id] = PortState()
for port in dp.ports.values():
self.port_state[dp.id].add(port.port_no, port)
def _unregister(self, dp):
"""
This function is called when a switch
dies. It helps with the book-keeping
and clean up.
"""
if dp.id in self.dpids:
del self.dpids[dp.id]
del self.port_state[dp.id]
def _get_switch(self, dpid):
"""
Returns the switch representation
of the datapath id.
"""
if dpid in self.dpids:
switch = Switch(self.dpids[dpid])
for ofpport in self.port_state[dpid].values():
switch.add_port(ofpport)
return switch
def _get_port(self, dpid, port_no):
"""
Returns the controller's representation of a port.
"""
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):
"""
Adds the port to a list of ports used to
connect two switches.
"""
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 _link_down(self, port):
"""
Creates an event that will tell the controller
that the link state has changed so that the
controller can reflect that in its representation.
"""
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)
def _lldp_handler(self, msg):
"""
Will react to LLDP packets by parsing then and creating
events so that the controller knows to update its topology
representation.
"""
try:
# Attempt to parse the packet as an LLDP packet
# Will fail if it is not an LLDP packet
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
#print("Not LLDP Packet")
return
dst_dpid = msg.datapath.id
if msg.datapath.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
dst_port_no = msg.in_port
elif msg.datapath.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
dst_port_no = msg.match['in_port']
else:
LOG.error('cannot accept LLDP. unsupported version. %x',
msg.datapath.ofproto.OFP_VERSION)
src = self._get_port(src_dpid, src_port_no)
if not src or src.dpid == dst_dpid:
return
try:
self.ports.lldp_received(src)
except KeyError:
# 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
dst = self._get_port(dst_dpid, dst_port_no)
if not dst:
return
old_peer = self.links.get_peer(src)
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 link not in self.links:
self.send_event_to_observers(event.EventLinkAdd(link))
if src_dpid not in self.switch_ports:
self.switch_ports[src_dpid] = []
if src_port_no not in self.switch_ports[src_dpid]:
self.switch_ports[src_dpid].append(src_port_no)
if dst_dpid not in self.switch_ports:
self.switch_ports[dst_dpid] = []
if dst_port_no not in self.switch_ports[dst_dpid]:
self.switch_ports[dst_dpid].append(dst_port_no)
if not self.links.update_link(src, dst):
self.ports.move_front(dst)
self.lldp_event.set()
def send_lldp_packet(self, port):
"""
Handles the crafting and sending of LLDP packets
For each port on each switch, create a packet
unique to that (switch,port) combination.
"""
try:
port_data = self.ports.lldp_sent(port)
except KeyError as e:
# ports can be modified during our sleep in self.lldp_loop()
# LOG.debug('send_lldp: KeyError %s', e)
return
if port_data.is_down:
return
dp = self.dpids.get(port.dpid, None)
if dp is None:
# datapath was already deleted
return
# LOG.debug('lldp sent dpid=%s, port_no=%d', dp.id, port.port_no)
# TODO:XXX
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
actions = [dp.ofproto_parser.OFPActionOutput(port.port_no)]
dp.send_packet_out(actions=actions, data=port_data.lldp_data)
elif dp.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
actions = [dp.ofproto_parser.OFPActionOutput(port.port_no)]
out = dp.ofproto_parser.OFPPacketOut(
datapath=dp, in_port=dp.ofproto.OFPP_CONTROLLER,
buffer_id=dp.ofproto.OFP_NO_BUFFER, actions=actions,
data=port_data.lldp_data)
dp.send_msg(out)
else:
LOG.error('cannot send lldp packet. unsupported version. %x',
dp.ofproto.OFP_VERSION)
def lldp_loop(self):
"""
This function is how the topology is kept up to date.
It will send out LLDP packets at every interval to
update the topology.
"""
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)
for port in ports:
self.send_lldp_packet(port)
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.draw_graph(1, draw=True)
self.lldp_event.wait(timeout=timeout)
def link_loop(self):
"""
This function helps update the actual connection
between switches. I don't know the difference
between this function and lldp_loop, but you
need both of them, otherwise, the topology won't
update.
"""
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.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()
if link.dst.port_no in self.switch_ports[link.dst.dpid]:
self.switch_ports[link.dst.dpid].remove(link.dst.port_no)
if link.src.port_no in self.switch_ports[link.src.dpid]:
self.switch_ports[link.src.dpid].remove(link.src.port_no)
self.link_event.wait(timeout=self.TIMEOUT_CHECK_PERIOD)
##################################
# Application Implementations #
##################################
def _request_port_stats(self, datapath):
"""
Sends a message to each switch requesting
port statistics. This is used for network
analytics.
"""
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
req = parser.OFPPortStatsRequest(datapath, 0, ofproto.OFPP_NONE)
datapath.send_msg(req)
#Adds or removes an IP flow from each switch
def _modify_blacklist(self, ipaddr, mode, dl_type=0x800):
res = struct.unpack('!I', ipv4_to_bin(ipaddr))[0]
if mode == "add":
if ipaddr in self.blacklist:
return
self.blacklist.append(ipaddr)
elif mode == "remove":
if ipaddr not in self.blacklist:
return
self.blacklist.remove(ipaddr)
for dp in self.dpids:
datapath = self.dpids[dp]
ofproto = datapath.ofproto
match = datapath.ofproto_parser.OFPMatch(dl_type=dl_type, nw_src=res)
if mode == "add":
print("Adding " + ipaddr + " to blacklist")
command = ofproto.OFPFC_ADD
elif mode == "remove":
print("Removing " + ipaddr + " to blacklsit")
command = ofproto.OFPFC_DELETE
mod = datapath.ofproto_parser.OFPFlowMod(datapath=datapath, match=match,\
cookie=0,command=command, idle_timeout=0, hard_timeout=0,\
priority=ofproto.OFP_DEFAULT_PRIORITY+5,\
flags=ofproto.OFPFF_SEND_FLOW_REM, actions=None)
datapath.send_msg(mod)
#Changes transmission rate on a switch's port -- meant for HP switches
#@todo: make more general? Throttle switches that see an IP address
def _modify_throttle(self, switch_ip, port, mode, username="******", password="******"):
if mode == "add":
if ipaddr in self.throttle_list: return
self.throttle_list.append((switch, port))
command = 'interface ethernet' + `port` + ' rate-limit all out kbps 10000'
elif mode == "rmv":
if ipaddr not in self.throttle_list: return
self.throttle_list.remove((switch, port))
command = 'no interface ethernet' + `port` + ' rate-limit all out kbps 10000'
print("Starting throttle command")
s = pexpect.spawn("ssh %s@%s" %(username, switch_ip))
s.expect('.*assword: ')
# Send the password
s.sendline(password)
s.expect('Press any key to continue')
# Send the return key
s.send('\r')
s.sendline('config \n')
s.sendline(command)
s.sendline('logo')
s.sendline('y')
print('Throttle Successful')
def clear_all_flows(self):
for switch in [1,2,3,4,5,6,8,9,10,11,12,13,14]:
print("Deleting flows on {}".format(switch))
system("dpctl del-flows tcp:10.10.0.{}:6655".format(switch))
for dp in self.dpids:
datapath = self.dpids[dp]
print("Adding flows onto {}".format(dp))
self._create_lldp_flow(datapath)
self._create_arp_flow(datapath)
self._create_icmp_flow(datapath)
def switch_on_all_ports(self,username="******", password="******"):
for dp in self.dpids:
dp = hex(dp)
print("logging into " + self.dpid_to_ip[dp])
s = spawn("ssh %s@%s" %(username, self.dpid_to_ip[dp]))
s.expect(".*assword")
s.sendline(password)
s.expect("Press any key to continue")
s.sendline("\r")
s.sendline("config")
for n in range(1,25):
#print("Enabling port " + `n` + " on " + self.dpid_to_ip[dp])
s.sendline("interface ethernet " + `n` + " enable")
s.sendline("save")
s.sendline("logo")
s.sendline("y")
print("CREATED FULLY CONNECTED GRAPH")
def create_spanning_tree(self, username="******", password="******"):
T = nx.minimum_spanning_tree(self.graph)
used_links = []
disabled_ports = {}
for link in self.links:
used = False
src, dst = hex(link.src.dpid), hex(link.dst.dpid)
for edge in T.edges():
if (src,dst) == edge or (dst,src) == edge:
used = True
if not used:
if link.src.dpid not in disabled_ports:
disabled_ports[link.src.dpid] = []
disabled_ports[link.src.dpid].append(link.src.port_no)
for dp in disabled_ports:
ip = self.dpid_to_ip[hex(dp)]
print("logging into " + ip)
s = spawn("ssh %s@%s" %(username, ip))
s.expect(".*assword")
s.sendline(password)
s.expect("Press any key to continue")
s.sendline("\r")
s.sendline("config")
for n in disabled_ports[dp]:
#print("Enabling port " + `n` + " on " + self.dpid_to_ip[dp])
s.sendline("interface ethernet " + `n` + " disable")
s.sendline("save")
s.sendline("logo")
s.sendline("y")
print("CREATED SPANNING TREE")
def send_ping(self, ip_dst):
pkt = packet.Packet()
if ip_dst in self.arp_table:
mac_dst = self.arp_table[ip_dst]
else:
return
pkt.add_protocol(ethernet.ethernet(ethertype=0x800,dst=mac_dst,\
src=self.hw_addr))
pkt.add_protocol(ipv4.ipv4(dst= ip_dst, src=self.ip_addr,proto=1))
pkt.add_protocol(icmp.icmp(type_= 8, code=0, csum=0))#Not sure about echo
print("Ping packet sent")
self._flood_packet(pkt)
def map_hosts(self,time=2):
with open("ipList.txt", "r") as f:
lines = f.readlines()
shuffle(lines)
for line in lines:
line = line.strip()
print("Sending ARP to " + line)
self._handle_arp_rq(line)
hub.sleep(1)
