def __makeflow(self):
if haveIPAddrGen:
srcip = str(IPv4Address(ipaddrgen.generate_addressv4(self.ipsrcgen)))
dstip = str(IPv4Address(ipaddrgen.generate_addressv4(self.ipdstgen)))
else:
srcip = str(IPAddress(int(self.ipsrc) + random.randint(0,self.ipsrc.numhosts-1)))
dstip = str(IPAddress(int(self.ipdst) + random.randint(0,self.ipdst.numhosts-1)))
ipproto = self.ipproto
sport = dport = 0
if ipproto == IPPROTO_ICMP:
# std way that netflow encodes icmp type/code:
# type in high-order byte of dport,
# code in low-order byte
t = next(self.icmptype)
c = next(self.icmpcode)
dport = t << 8 | c
# print 'icmp t,c,dport',hex(t),hex(c),hex(dport)
else:
if self.sport:
sport = next(self.sport)
if self.dport:
dport = next(self.dport)
flet = Flowlet(FlowIdent(srcip, dstip, ipproto, sport, dport))
flet.iptos = next(self.iptos)
flet.flowstart = flet.flowend = fscore().now
if flet.ipproto == IPPROTO_TCP:
flet.ackflow = not self.autoack
tcpflags = next(self.tcpflags)
flaglist = tcpflags.split('|')
xtcpflags = 0x0
for f in flaglist:
if f == 'FIN':
xtcpflags |= 0x01
elif f == 'SYN':
xtcpflags |= 0x02
elif f == 'RST':
xtcpflags |= 0x04
elif f == 'PUSH' or f == 'PSH':
xtcpflags |= 0x08
elif f == 'ACK':
xtcpflags |= 0x10
elif f == 'URG':
xtcpflags |= 0x20
elif f == 'ECE':
xtcpflags |= 0x40
elif f == 'CWR':
xtcpflags |= 0x80
else:
raise InvalidFlowConfiguration('Invalid TCP flags mnemonic ' + f)
flet.tcpflags = xtcpflags
return flet
def send_ack_flow(self, flowlet, input_intf):
# print "constructing ack flow:", self.name, flowlet, prevnode, destnode, input_intf
revident = flowlet.ident.mkreverse()
revflet = Flowlet(revident)
revflet.srcmac,revflet.dstmac = flowlet.dstmac,flowlet.srcmac
revflet.ackflow = True
revflet.pkts = flowlet.pkts/2
revflet.bytes = revflet.pkts * 40
revflet.iptos = flowlet.iptos
revflet.tcpflags = flowlet.tcpflags
revflet.ingress_intf = input_intf
revflet.flowstart = fscore().now
revflet.flowend = revflet.flowstart
destnode = fscore().topology.destnode(self.name, revflet.dstaddr)
# self.logger.debug("Injecting reverse flow: {}->{}".format(revflet.srcmac, revflet.dstmac))
self.flowlet_arrival(revflet, self.name, destnode)
def send_ack_flow(self, flowlet, input_intf):
# print "constructing ack flow:", self.name, flowlet, prevnode, destnode, input_intf
revident = flowlet.ident.mkreverse()
revflet = Flowlet(revident)
revflet.srcmac,revflet.dstmac = flowlet.dstmac,flowlet.srcmac
revflet.ackflow = True
revflet.pkts = flowlet.pkts/2
revflet.bytes = revflet.pkts * 40
revflet.iptos = flowlet.iptos
revflet.tcpflags = flowlet.tcpflags
revflet.ingress_intf = input_intf
revflet.flowstart = fscore().now
revflet.flowend = revflet.flowstart
destnode = fscore().topology.destnode(self.name, revflet.dstaddr)
# self.logger.debug("Injecting reverse flow: {}->{}".format(revflet.srcmac, revflet.dstmac))
self.flowlet_arrival(revflet, self.name, destnode)
