def isValidIpPacket(self,event):
# ipv4_packet = event.parsed.find("ipv4")
ipv4_packet = event.parsed.find("ipv4")
# Do more processing of the IPv4 packet
src_ip = ipv4_packet.srcip
dst_ip = ipv4_packet.dstip
if(ipv4_packet.csum!=ipv4_packet.checksum()):
print "Ip packet checksum not macthing"
return False
if(ipv4_packet.ttl<=1):
if(dst_ip==self.IPAddr or dst_ip.toStr()=='255.255.255.255'):
print "My Packet accept at ",self.IPAddr
print ipv4_packet
if(packet.payload.protocol==packet.payload.ICMP_PROTOCOL):
self.handle_icmp(event)
return False
print "TTL Invalid"
icmp_rep = icmp()
icmp_rep.type = 11 # TYPE_TIME_EXCEED
#icmp_rep.code=0
icmp_rep.next=unreach()
# icmp_rep.next.seq=packet.payload.next.next.seq
# icmp_rep.next.id=packet.payload.next.next.id
# icmp_rep.next.raw=packet.payload.next.next.raw
# Show the client that it's actually the me
rep=ipv4()
rep.srcip=self.IPAddr
rep.dstip=ipv4_packet.srcip
rep.next=icmp_rep
rep.protocol=ipv4_packet.ICMP_PROTOCOL
eth = ethernet()
eth.dst = event.parsed.src
eth.src = self.EthAddr
eth.set_payload(rep)
eth.type = ethernet.IP_TYPE
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_IN_PORT))
msg.in_port = event.port
self.connection.send(msg)
return False
if(ipv4_packet.iplen<20):
print "Length Invalid"
return False
# len > min_len
return True
def handle_ipPacket(self,event): # handle broad cast ip also
print "IP packet Received at R"+str(event.dpid)
packet=event.parsed
src_mac = packet.src
dst_mac = packet.dst
if dst_mac!=self.EthAddr and dst_mac!=EthAddr('ff:ff:ff:ff:ff:ff'):
return
if(not self.isValidIpPacket(event)):
return
ipv4_packet = event.parsed.find("ipv4")
# Do more processing of the IPv4 packet
src_ip = ipv4_packet.srcip
dst_ip = ipv4_packet.dstip
if(dst_ip==self.IPAddr or dst_ip.toStr()=='255.255.255.255'):
print "My Packet accept at ",self.IPAddr
print ipv4_packet
if(packet.payload.protocol==packet.payload.ICMP_PROTOCOL):
self.handle_icmp(event)
else:
nxt=self.FindNextHopInterface(dst_ip.toStr())
if(nxt[0]==-1): # need to send an icmp packet
# print "No Route to Host"
# Create ARP reply
icmp_rep = icmp()
icmp_rep.type = 3
icmp_rep.code= nxt[2]
icmp_rep.next=unreach()
# icmp_rep.next.seq=packet.payload.next.next.seq
# icmp_rep.next.id=packet.payload.next.next.id
# icmp_rep.next.raw=packet.payload.next.next.raw
# Show the client that it's actually the me
rep=ipv4()
rep.srcip=self.IPAddr
rep.dstip=src_ip
rep.next=icmp_rep
rep.protocol=packet.payload.ICMP_PROTOCOL
eth = ethernet()
eth.dst = packet.src
eth.src = self.EthAddr
eth.set_payload(rep)
eth.type = ethernet.IP_TYPE
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_IN_PORT))
msg.in_port = event.port
self.connection.send(msg)
print "icmp reply DONE"
else:
NextHopIP=nxt[0]
Interface=nxt[1][-1]
# payload=packet.payload.pa/yload # payload of IP packet
# create a empty IP packet
# ipv4_packet_out=ipv4_packet
ipv4_packet.ttl=ipv4_packet.ttl-1
# Create the Ethernet packet
eth = ethernet()
eth.type = ethernet.IP_TYPE
if IPAddr(NextHopIP) in self.arp_table:
eth.dst = self.arp_table[IPAddr(NextHopIP)]
eth.src = self.EthAddr
eth.set_payload(ipv4_packet)
# msg is the "packet out" message. Now giving this packet special properties
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = int(Interface)))
msg.in_port = event.port
self.connection.send(msg)
else:
arp_rep = arp()
arp_rep.opcode = arp.REQUEST
# Show the client that it's actually the me
arp_rep.hwsrc = self.EthAddr
arp_rep.hwdst = EthAddr('ff:ff:ff:ff:ff:ff')
#arp_rep.hwdst = 'ff:ff:ff:ff:ff:ff'
arp_rep.protosrc = self.IPAddr
arp_rep.protodst = IPAddr(NextHopIP)
# Create the Ethernet packet
eth1 = ethernet()
eth1.type = ethernet.ARP_TYPE
eth1.dst = EthAddr('ff:ff:ff:ff:ff:ff')
eth1.src = self.EthAddr
eth1.set_payload(arp_rep)
# Send the ARP reply to client
# msg is the "packet out" message. Now giving this packet special properties
msg = of.ofp_packet_out()
msg.data = eth1.pack()
msg.actions.append(of.ofp_action_output(port = int(Interface)))
msg.in_port = event.port
self.connection.send(msg)
eth.src = self.EthAddr
eth.set_payload(ipv4_packet_out)
self.que.append((eth,int(Interface),event.port))
def handle_ipPacket(self,event): # handle broad cast ip also
# print "IP packet Received at R"+str(event.dpid)
packet=event.parsed
if(packet is None):
print "error"
print event
src_mac = packet.src
dst_mac = packet.dst
ipv4_packet = event.parsed.next
if(ipv4_packet is None):
print "error"
print event
# Do more processing of the IPv4 packet
src_ip = ipv4_packet.srcip
dst_ip = ipv4_packet.dstip
global _hello_tos, _lsu_tos
if ipv4_packet.tos == _hello_tos:
print "HELLO at R"+str(event.dpid)+" from "+src_ip.toStr()
self.neighbours[event.port]=src_ip
self.times[event.port]=time.time()
self.G.add_edge(self.IPAddr,src_ip)
self.send_lsu()
return
if ipv4_packet.tos == _lsu_tos:
if src_ip==self.IPAddr:
return
print "LSU at R"+str(event.dpid)+" from "+src_ip.toStr()
self.times2[src_ip]=time.time()
pl=ipv4_packet.next
lst=pl.split(':')[:-1]
if src_ip in self.seqnum.keys() and self.seqnum[src_ip]>=int(pl[0]):
return
self.seqnum[src_ip]=int(pl[0])
ed=[i for i in self.G.edges() if i[0]==src_ip]
try:
self.G.remove_edges_from(ed)
except:
pass
for i in lst[1:]:
self.G.add_edge(src_ip,IPAddr(i))
eth = ethernet()
eth.src = self.EthAddr
eth.set_payload(ipv4_packet)
eth.type = ethernet.IP_TYPE
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_ALL))
self.connection.send(msg)
return
if dst_mac!=self.EthAddr and dst_mac!=EthAddr('ff:ff:ff:ff:ff:ff'):
return
if(not self.isValidIpPacket(event)):
return
if(dst_ip==self.IPAddr or dst_ip.toStr()=='255.255.255.255'):
if(packet.payload.protocol==packet.payload.ICMP_PROTOCOL):
self.handle_icmp(event)
else:
nxt=self.FindNextHopInterface(dst_ip.toStr())
if(nxt[0]==-1): # need to send an icmp packet
# print "No Route to Host"
# Create ARP reply
icmp_rep = icmp()
icmp_rep.type = 3
icmp_rep.code= nxt[2]
icmp_rep.next=unreach()
# icmp_rep.next.seq=packet.payload.next.next.seq
# icmp_rep.next.id=packet.payload.next.next.id
# icmp_rep.next.raw=packet.payload.next.next.raw
# Show the client that it's actually the me
rep=ipv4()
rep.srcip=self.IPAddr
rep.dstip=src_ip
rep.next=icmp_rep
rep.protocol=packet.payload.ICMP_PROTOCOL
eth = ethernet()
eth.dst = packet.src
eth.src = self.EthAddr
eth.set_payload(rep)
eth.type = ethernet.IP_TYPE
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = of.OFPP_IN_PORT))
msg.in_port = event.port
self.connection.send(msg)
print "icmp reply DONE"
else:
NextHopIP=nxt[0]
Interface=nxt[1][-1]
payload=packet.payload.payload # payload of IP packet
# create a empty IP packet
ipv4_packet_out=ipv4_packet
ipv4_packet_out.ttl=ipv4_packet_out.ttl-1
# Create the Ethernet packet
eth = ethernet()
eth.type = ethernet.IP_TYPE
if IPAddr(NextHopIP) in self.arp_table:
eth.dst = self.arp_table[IPAddr(NextHopIP)]
eth.src = self.EthAddr
eth.set_payload(ipv4_packet_out)
# msg is the "packet out" message. Now giving this packet special properties
msg = of.ofp_packet_out()
msg.data = eth.pack()
msg.actions.append(of.ofp_action_output(port = int(Interface)))
msg.in_port = event.port
self.connection.send(msg)
else:
arp_rep = arp()
arp_rep.opcode = arp.REQUEST
# Show the client that it's actually the me
arp_rep.hwsrc = self.EthAddr
arp_rep.hwdst = EthAddr('ff:ff:ff:ff:ff:ff')
#arp_rep.hwdst = 'ff:ff:ff:ff:ff:ff'
arp_rep.protosrc = self.IPAddr
arp_rep.protodst = IPAddr(NextHopIP)
# Create the Ethernet packet
eth1 = ethernet()
eth1.type = ethernet.ARP_TYPE
eth1.dst = EthAddr('ff:ff:ff:ff:ff:ff')
eth1.src = self.EthAddr
eth1.set_payload(arp_rep)
# Send the ARP reply to client
# msg is the "packet out" message. Now giving this packet special properties
msg = of.ofp_packet_out()
msg.data = eth1.pack()
msg.actions.append(of.ofp_action_output(port = int(Interface)))
msg.in_port = event.port
self.connection.send(msg)
eth.src = self.EthAddr
eth.set_payload(ipv4_packet_out)
self.que.append((eth,int(Interface),event.port))