/
of_tutorial2_fw.py
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/
of_tutorial2_fw.py
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from pox.core import core
import pox
log = core.getLogger()
import pox.lib.packet as pkt
from pox.lib.packet.ethernet import ethernet, ETHER_BROADCAST
from pox.lib.packet.ipv4 import ipv4
#from pox.lib.packet.icmp import icmp
from pox.lib.packet.arp import arp
from pox.lib.addresses import IPAddr, EthAddr
from pox.lib.util import str_to_bool, dpidToStr
from pox.lib.recoco import Timer
import pox.openflow.libopenflow_01 as of
from pox.lib.revent import *
import time
class Entry (object):
def __init__ (self, port, mac):
self.port = port
self.mac = mac
def __eq__ (self, other):
if type(other) == tuple:
return (self.port,self.mac)==other
else:
return (self.port,self.mac)==(other.port,other.mac)
def __ne__ (self, other):
return not self.__eq__(other)
def dpid_to_mac (dpid):
return EthAddr("%012x" % (dpid & 0xffFFffFFffFF,))
class router (EventMixin):
def __init__ (self, arp_for_unknowns = False):
self.arp_for_unknowns = arp_for_unknowns
self.message_queue = {}
self.arpTable= {}
"""
self.arpTable[1]= {}
self.arpTable[2]= {}
"""
self.ip_to_port = {}
self.routingTable={}
#self.routingTable[2]={}
self.routingTable[1] = [ ['10.0.1.2', '10.0.1.2', 's1-eth1', '10.0.1.1', 1],['10.0.1.3', '10.0.1.3','s1-eth2', '10.0.1.1', 2],['10.0.2.2', '10.0.3.2', 's1-eth3', '10.0.3.1', 3]]
self.routingTable[2] = [ ['10.0.2.2', '10.0.2.2', 's2-eth1', '10.0.2.1', 1],['10.0.1.2', '10.0.3.1', 's2-eth2', '10.0.3,2', 2],['10.0.1.3', '10.0.3.1', 's2-eth3', '10.0.3.2', 2]]
"""
self.arpTable[1] = [ ['10.0.1.1', '92:66:3c:5f:00:4f', 1],['10.0.2.1 4','26:22:39:c5:02:e9', 2],['10.0.5.1','82:2e:de:d7:db:a7', 3]]
self.arpTable[1][IPAddr("10.0.1.1")]=EthAddr("92:66:3c:5f:00:4f")
self.arpTable[1][IPAddr("10.0.2.1")]=EthAddr("26:22:39:c5:02:e9")
self.arpTable[1][IPAddr("10.0.5.1")]=EthAddr("82:2e:de:d7:db:a7")
self.arpTable[2][IPAddr("10.0.3.1")]=EthAddr("a6:5e:13:57:db:b4")
self.arpTable[2][IPAddr("10.0.4.1")]=EthAddr("6e:d3:b4:f2:34:5e")
self.arpTable[2][IPAddr("10.0.6.1")]=EthAddr("c6:c1:b9:f8:a9:77")
"""
self.arpTable=[['10.0.1.1','92:66:3c:5f:00:4f','1'],['10.0.2.1','26:22:39:c5:02:e9','2'],['10.0.3.1','82:2e:de:d7:db:a7','3'],['10.0.3.2','a6:5e:13:57:db:b4','4']]
core.register("learning_switch", self)
self.listenTo(core)
def sendWaitingPackets (self, dpid, ipaddr, macaddr, port):
if (dpid,ipaddr) in self.message_queue:
bucket = self.message_queue[(dpid,ipaddr)]
del self.message_queue[(dpid,ipaddr)]
log.debug("Sending %i buffered packets to %s from %s"
% (len(bucket),ipaddr,dpidToStr(dpid)))
for _,buffer_id,in_port in bucket:
po = of.ofp_packet_out(buffer_id=buffer_id,in_port=in_port)
po.actions.append(of.ofp_action_dl_addr.set_dst(macaddr))
po.actions.append(of.ofp_action_output(port = port))
core.openflow.sendToDPID(dpid, po)
def _handle_GoingUpEvent (self, event):
self.listenTo(core.openflow)
log.debug("Up...")
def _handle_PacketIn (self, event):
dpid = event.connection.dpid
inport = event.port
packet = event.parsed
if not packet.parsed:
log.warning("%i %i ignoring unparsed packet", dpid, inport)
return
if dpid not in self.arpTable:
self.arpTable[dpid] = {}
if packet.type == ethernet.LLDP_TYPE:
return
if isinstance(packet.next, ipv4):
log.debug("%i %i IP %s => %s", dpid,inport,packet.next.srcip,packet.next.dstip)
self.sendWaitingPackets (dpid, packet.next.srcip, packet.src, inport)
if packet.next.srcip in self.arpTable[dpid]:
if self.arpTable[dpid][packet.next.srcip] != (inport, packet.src):
log.info("%i %i RE-learned %s", dpid,inport,packet.next.srcip)
else:
log.debug("%i %i learned %s", dpid,inport,str(packet.next.srcip))
self.arpTable[dpid][packet.next.srcip] = Entry(inport, packet.src)
prt = 0
dstaddr = packet.next.dstip
prt = self.ip_to_port.get(dstaddr)
s1='10.0.1.2'
if str(dstaddr) == str(s1):
log.debug("FIREWALL BLOCKING THE IP")
return
if prt != None:
log.debug("Got port %i from dictionary",prt)
mac = None
if dstaddr in self.arpTable[dpid]:
mac = self.arpTable[dpid][dstaddr].mac
if mac!=None:
actions = []
actions.append(of.ofp_action_dl_addr.set_dst(mac))
actions.append(of.ofp_action_dl_addr.set_src(dpid_to_mac(dpid)))
actions.append(of.ofp_action_output(port = prt))
match = of.ofp_match.from_packet(packet, inport)
match.dl_src = None
msg = of.ofp_flow_mod(command=of.OFPFC_ADD,buffer_id=event.ofp.buffer_id,actions=actions,match=of.ofp_match.from_packet(packet,inport))
event.connection.send(msg.pack())
return
else:
# Add to tracked buffers
if (dpid,dstaddr) not in self.message_queue:
self.message_queue[(dpid,dstaddr)] = []
bucket = self.message_queue[(dpid,dstaddr)]
entry = (None,event.ofp.buffer_id,inport)
bucket.append(entry)
r = arp()
r.hwtype = r.HW_TYPE_ETHERNET
r.prototype = r.PROTO_TYPE_IP
r.hwlen = 6
r.protolen = r.protolen
r.opcode = r.REQUEST
r.hwdst = ETHER_BROADCAST
r.protodst = dstaddr
r.hwsrc = dpid_to_mac(dpid)
r.protosrc = packet.next.srcip
e = ethernet(type=ethernet.ARP_TYPE, src=packet.src,dst=ETHER_BROADCAST)
e.set_payload(r)
log.debug("%i %i ARPing for %s on behalf of %s" % (dpid, inport,str(r.protodst), str(r.protosrc)))
msg = of.ofp_packet_out()
msg.data = e.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_FLOOD))
msg.in_port = inport
event.connection.send(msg)
else:
icmpflag = 0
for list in self.routingTable[dpid]:
if list[0] == str(dstaddr):
log.debug("Searching Routing Table for IP address: %s ",str(dstaddr))
prt = list[4]
if list[3] == str(dstaddr):
prt = list[4]
icmpflag = 1
self.arpTable[dpid][dstaddr] = Entry(prt, dpid_to_mac(dpid))
if icmpflag == 1:
icmp = pkt.icmp()
icmp.type = pkt.TYPE_ECHO_REPLY
icmp.payload = packet.find("icmp").payload
# Make the IP packet around it
ipp = pkt.ipv4()
ipp.protocol = ipp.ICMP_PROTOCOL
ipp.srcip = packet.find("ipv4").dstip
ipp.dstip = packet.find("ipv4").srcip
# Ethernet around that...
e = pkt.ethernet()
e.src = packet.dst
e.dst = packet.src
e.type = e.IP_TYPE
# Hook them up...
ipp.payload = icmp
e.payload = ipp
# Send it back to the input port
msg = of.ofp_packet_out()
msg.actions.append(of.ofp_action_output(port = of.OFPP_IN_PORT))
msg.data = e.pack()
msg.in_port = event.port
event.connection.send(msg)
return
if prt == None:
log.debug("Unreachable IP Address : %s",str(dstaddr))
icmp = pkt.icmp()
icmp.type = 3
#icmp.payload = packet.find("icmp").payload
# Make the IP packet around it
ipp = pkt.ipv4()
ipp.protocol = ipp.ICMP_PROTOCOL
ipp.srcip = packet.find("ipv4").dstip
ipp.dstip = packet.find("ipv4").srcip
# Ethernet around that...
e = pkt.ethernet()
e.src = packet.dst
e.dst = packet.src
e.type = e.IP_TYPE
# Hook them up...
ipp.payload = icmp
e.payload = ipp
# Send it back to the input port
msg = of.ofp_packet_out()
msg.actions.append(of.ofp_action_output(port = of.OFPP_IN_PORT))
msg.data = e.pack()
msg.in_port = event.port
event.connection.send(msg)
return
log.debug("Got Port Number : %s from routing table",prt)
self.ip_to_port[dstaddr] = prt
mac = None
if dstaddr in self.arpTable[dpid]:
mac = self.arpTable[dpid][dstaddr].mac
if mac!=None:
actions = []
actions.append(of.ofp_action_dl_addr.set_dst(mac))
actions.append(of.ofp_action_dl_addr.set_src(dpid_to_mac(dpid)))
actions.append(of.ofp_action_output(port = prt))
match = of.ofp_match.from_packet(packet, inport)
match.dl_src = None # Wildcard source MAC
msg = of.ofp_flow_mod(command=of.OFPFC_ADD,buffer_id=event.ofp.buffer_id,actions=actions,match=of.ofp_match.from_packet(packet,inport))
event.connection.send(msg.pack())
return
else:
if (dpid,dstaddr) not in self.message_queue:
self.message_queue[(dpid,dstaddr)] = []
bucket = self.message_queue[(dpid,dstaddr)]
entry = (None,event.ofp.buffer_id,inport)
bucket.append(entry)
r = arp()
r.hwtype = r.HW_TYPE_ETHERNET
r.prototype = r.PROTO_TYPE_IP
r.hwlen = 6
r.protolen = r.protolen
r.opcode = r.REQUEST
r.hwdst = ETHER_BROADCAST
r.protodst = dstaddr
r.hwsrc = dpid_to_mac(dpid)
r.protosrc = packet.next.srcip
e = ethernet(type=ethernet.ARP_TYPE, src=packet.src,dst=ETHER_BROADCAST)
e.set_payload(r)
log.debug("%i %i ARPing for %s on behalf of %s" % (dpid, inport,str(r.protodst), str(r.protosrc)))
msg = of.ofp_packet_out()
msg.data = e.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_FLOOD))
msg.in_port = inport
event.connection.send(msg)
elif isinstance(packet.next, arp):
a = packet.next
log.debug("%i %i ARP %s %s => %s", dpid, inport,
{arp.REQUEST:"request",arp.REPLY:"reply"}.get(a.opcode,
'op:%i' % (a.opcode,)), str(a.protosrc), str(a.protodst))
dstaddr = a.protodst
prt = None
for list in self.routingTable[dpid]:
if list[0] == str(dstaddr):
log.debug("Searching Routing Table for IP address: %s ",str(dstaddr))
prt = list[4]
log.debug("The mac address is %s",dpid_to_mac(dpid))
if list[3] == str(dstaddr):
prt = list[4]
#icmpflag = 1
self.arpTable[dpid][dstaddr] = Entry(prt, dpid_to_mac(dpid))
log.debug("The mac address is %s",dpid_to_mac(dpid))
if prt == None:
log.debug("Unreachable IP Address : %s",str(dstaddr))
return
if a.prototype == arp.PROTO_TYPE_IP:
if a.hwtype == arp.HW_TYPE_ETHERNET:
if a.protosrc != 0:
# Learn or update port/MAC info
if a.protosrc in self.arpTable[dpid]:
if self.arpTable[dpid][a.protosrc] != (inport, packet.src):
log.info("%i %i RE-learned %s", dpid,inport,str(a.protosrc))
else:
log.debug("%i %i learned %s", dpid,inport,str(a.protosrc))
self.arpTable[dpid][a.protosrc] = Entry(inport, packet.src)
log.debug("The inport %i The input mac address is %s",inport,str(packet.src))
# Send any waiting packets...
self.sendWaitingPackets(dpid, a.protosrc, packet.src, inport)
if a.opcode == arp.REQUEST:
# Maybe we can answer
if a.protodst in self.arpTable[dpid]:
# We have an answer...
log.debug("This is a known path")
r = arp()
r.hwtype = a.hwtype
r.prototype = a.prototype
r.hwlen = a.hwlen
r.protolen = a.protolen
r.opcode = arp.REPLY
r.hwdst = a.hwsrc
r.protodst = a.protosrc
r.protosrc = a.protodst
r.hwsrc = self.arpTable[dpid][a.protodst].mac
e = ethernet(type=packet.type, src=dpid_to_mac(dpid), dst=a.hwsrc)
e.set_payload(r)
log.debug("%i %i answering ARP from %s to %s" % (dpid, inport,str(r.protosrc),str(r.protodst)))
msg = of.ofp_packet_out()
msg.data = e.pack()
msg.actions.append(of.ofp_action_output(port =
of.OFPP_IN_PORT))
msg.in_port = inport
event.connection.send(msg)
return
if a.opcode == arp.REPLY:
self.arpTable[dpid][dstaddr] = Entry(prt, a.hwsrc)
for list in self.routingTable[dpid]:
if list[0] == str(a.protodst):
log.debug("Searching Routing Table for IP address: %s ",str(a.protodst))
prt = list[4]
msg = of.ofp_packet_out(in_port = inport, action = of.ofp_action_output(port = prt))
log.debug("%i %i flooding ARP %s %s => %s" % (dpid, inport,
{arp.REQUEST:"request",arp.REPLY:"reply"}.get(a.opcode,
'op:%i' % (a.opcode,)), str(a.protosrc), str(a.protodst)))
msg = of.ofp_packet_out(in_port = inport, action = of.ofp_action_output(port = of.OFPP_FLOOD))
if event.ofp.buffer_id is of.NO_BUFFER:
# Try sending the (probably incomplete) raw data
msg.data = event.data
else:
msg.buffer_id = event.ofp.buffer_id
event.connection.send(msg.pack())
def launch ( a=None):
a = str_to_bool(a)
core.registerNew(router, a)