def __init__(self, *args, **kwargs):
super(coupler, self).__init__(*args, **kwargs)
#modules are added to the coupler as objects
self.switch=SimpleSwitch()
#created address for crafted packets
self.hw_addr = 'aa:bb:cc:dd:ee:11'
self.ip_addr = '10.0.0.25'
##############################################################
#[2] Add Additional modules or object variables here or add
# definitions to the provided NFG_13.py file
self.NFG = NFG()
#######################################################################
#[3]Insert proactive rules provided by NFG library, follow format below
# Only offers drop and redirect options
def get_proactive_rules(self,dp,parser,ofproto):
pass
class coupler(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(coupler, self).__init__(*args, **kwargs)
#modules are added to the coupler as objects
self.switch=SimpleSwitch()
#created address for crafted packets
self.hw_addr = 'aa:bb:cc:dd:ee:11'
self.ip_addr = '10.0.0.25'
##############################################################
#[2] Add Additional modules or object variables here or add
# definitions to the provided NFG_13.py file
self.NFG = NFG()
#######################################################################
#[3]Insert proactive rules provided by NFG library, follow format below
# Only offers drop and redirect options
def get_proactive_rules(self,dp,parser,ofproto):
pass
#fields, ops = self.NFG.simpleFW()
#self._add_proactive_flow(dp, parser, ofproto, fields, ops)
#####################################################################
#[4] Use below handles to direct arriving packets to modules in NFG.py;
# modules return match fields (fields) and operations (ops)
# hashes (determined by programmer). Ensure that fields,ops
# are only set once in each handle (comment out default_Field_Ops).
######################################################################
#fields contains the following keys:
# {'keys':['inport','srcport'], 'ptype':None, 'inport':pkt['inport'],
# 'srcmac':pkt['srcmac'], 'dstmac':None, 'srcip':None, 'dstip':None,
# 'srcport':None, 'dstport':None}
######################################################################
#ops contains the following keys:
# {'hard_t':None, 'idle_t':None, 'priority':None, 'op':'fwd',
# 'newport':None}
# set *_t to 0 for permanent or >0 for temporary,
# set * 'priority' to 0 for lowest
# 'op':{'fwd', 'drop', 'mir' (mirror), 'newport' (redirect), 'craft'}
# 'newport': used for mirror and redirect, otherwise None
######################################################################
def handle_eth(self,pkt):
print "handle eth"
fields, ops = self.NFG.default_Field_Ops(pkt)
#print pkt['eth']
#fields, ops = check_list(pkt)
#fields, ops = self.NFG.Check_List(pkt)
self._switch_mod(pkt,fields,ops)
def handle_arp(self,pkt):
print "handle ARP"
print pkt
fields, ops = self.NFG.default_Field_Ops(pkt)
#print pkt['arp']
self._switch_mod(pkt, fields, ops)
#Apply the most restrictive fields,ops (based on priority) are applied
#to each packet. We will use priority to select.
def handle_ip(self,pkt):
#print pkt['ip']
#fields, ops = self.NFG.default_Field_Ops(pkt)
print "handle ip"
#fields2,ops2 = self.NFG.Stateful_FW(pkt)
##############################################################
#Determine highest priority fields and ops pair, if needed
#xfields = [fields0, fields1, fields2]
#xops = [ops0, ops1, ops2]
#fields,ops = self._build_FldOps(xfields,xops)
##############################################################
self._switch_mod(pkt,fields,ops)
def handle_icmp(self,pkt):
print "handle icmp"
fields, ops = self.NFG.default_Field_Ops(pkt)
#print pkt['icmp'], '\n', pkt['ip']
#fields, ops = self.NFG.TTL_Check(pkt)
self._switch_mod(pkt, fields, ops)
def handle_tcp(self,pkt):
print "handle tcp"
#fields, ops = self.NFG.default_Field_Ops(pkt)
#fields,ops = self.NFG.Simple_FW(pkt)
#print pkt['tcp']
fields, ops = self.NFG.TTL_Check(pkt)
# users can also call modules with no return
#self.NFG.displayTCPFields(pkt)
self._switch_mod(pkt, fields, ops)
def handle_udp(self,pkt):
print "handle udp"
fields, ops = self.NFG.default_Field_Ops(pkt)
#fields, ops = self.NFG.TTL_Check(pkt)
self._switch_mod(pkt, fields, ops)
def handle_unk(self,pkt):
print "handl unk"
fields, ops = self.NFG.default_Field_Ops(pkt)
self._switch_mod(pkt, fields, ops)
##################################################################
# Supporting Code
##################################################################
#Initialize switch to send all packets to controller (lowest priority)
# Adds a Table-miss flow entry (see page 8 of "Ryu: Using OpenFlow 1.3"
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
print "Received Switch features"
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# install table-miss flow entry
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions)
#self._get_proactive_rules(datapath,parser,ofproto)
def _add_proactive_flow(self,dp, parser, ofproto, fields,ops):
actions = []
if ops['op'] == 'drop':
out_port = ofproto.OFPPC_NO_RECV
actions.append(parser.OFPActionOutput(out_port))
if ops == 'redir':
out_port = ops['newport']
actions.append(parser.OFPActionOutput(out_port))
match = parser.OFPMatch(eth_type=fields['eth_type'],
ip_proto=fields['proto'],
ipv4_src=fields['srcip'],
ipv4_dst=fields['dstip'],
tcp_dst = fields['srctcp'])
self.add_flow(dp, ops['priority'], match, actions)
########################################################################
# Adds flow to the switch so future packets aren't sent to the cntrl
def add_flow(self, datapath, priority, match, actions, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
if buffer_id:
mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
priority=priority, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
########################################################################
# Adds flow to the switch so future packets are not sent to the
# controller (requires priority, idle_t, and hard_t)
def add_timeFlow(self, dp, ops, match, actions):
ofproto = dp.ofproto
parser = dp.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
#fix switch mod to address 'idle_t'
mod = parser.OFPFlowMod(datapath=dp,
priority=ops['priority'],
idle_timeout=ops['idle_t'],
hard_timeout=ops['hard_t'],
match=match, instructions=inst)
dp.send_msg(mod)
########################################################################
#This decorator calls initial_event for packet arrivals
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def initial_event(self,ev):
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
#Call <Pkt_Parse> to Build pkt object
parsPkt = Pkt_Parse()
pkt = parsPkt.handle_pkt(ev)
# Call appropriate handler for arriving packets (add IPv6,DHCP,etc.)
if pkt['udp'] != None:
self.handle_udp(pkt)
elif pkt['tcp'] != None:
self.handle_tcp(pkt)
elif pkt['icmp'] != None:
self.handle_icmp(pkt)
elif pkt['ip']!= None:
self.handle_ip(pkt)
elif pkt['arp']!=None:
self.handle_arp(pkt)
elif pkt['eth'] != None:
self.handle_eth(pkt)
else:
print "Packet not identified"
self.handle_unk(pkt)
############################################################
# Choose the field and ops having the highest priority and
# assert it.
def _build_FldOps(xfields,xops):
priority = 0
for x in len(xfields):
if xfields[x]['priority'] > priority:
fields,ops = xfields[x],xops[x]
return fields,ops
##############################################################
#Imeplement mac-learning (switch_mod13.py) for ethernet packets.
def _switch_mod(self, pkt, fields, ops):
#Build match from pkt and fields
match = self.pkt_match(fields)
#Build actions from pkt and ops
actions = self.pkt_action(pkt,ops,fields)
priority = ops['priority']
msg = fields['msg']
parser, ofproto = fields['dp'].ofproto_parser, fields['ofproto']
# install temporary flow to avoid future packet_in.
# idle_t and hard_t must be set to something.
if ops['idle_t'] or ops['hard_t']:
if out_port != ofproto.OFPP_FLOOD:
self.add_timeFlow(dp, ops, match, actions)
# For ping and wget, data = None
data = None
if msg.buffer_id == ofproto.OFP_NO_BUFFER:
data = msg.data
out = parser.OFPPacketOut(datapath=fields['dp'],
buffer_id=msg.buffer_id,
in_port=fields['inport'],
actions=actions, data=data)
fields['dp'].send_msg(out)
#############################################################
#Use fields to build match
def pkt_match(self, fields):
parser = fields['dp'].ofproto_parser
if fields['srcip'] != None and fields['srcip'] != None:
match = parser.OFPMatch(ipv4_src=fields['srcip'],
ipv4_dst = fields['dst_ip'])
elif fields['srcip'] != None or fields['srcip'] != None:
matchfield=fields['srcip'] if fields['srcip'] !=None else fields['dstip']
match = parser.OFPMatch(ipv4_src=matchfield)
elif fields['srcmac'] == None:
match = parser.OFPMatch(in_port=fields['inport'])
else:
match = parser.OFPMatch(in_port=fields['inport'],
eth_dst=fields['dstmac'])
return match
###############################################################
#Determine action to be taken on packet ops={'op':None, 'newport':None}
#User can forward , drop, redirect, mirror, or craft packets.
def pkt_action(self,pkt,ops,fields):
actions = []
parser = fields['dp'].ofproto_parser
if ops['op'] == 'fwd':
out_port = self.switch.handle_pkt(pkt)
actions.append(parser.OFPActionOutput(out_port))
elif ops['op'] == 'drop':
out_port = fields['ofproto'].OFPPC_NO_RECV
actions.append(parser.OFPActionOutput(out_port))
elif ops == 'redir':
out_port = ops['newport']
actions.append(parser.OFPActionOutput(out_port))
elif ops['op'] == 'mir':
out_port = self.switch.handle_pkt(pkt)
actions.append(parser.OFPActionOutput(out_port))
mir_port = ops['newport']
actions.append(parser.OFPActionOutput(mir_port))
elif ops['op'] == 'craft':
#create and send new pkt due to craft trigger
self._build_pkt(ops, fields) ##need to remove pkt ##########
#Now drop the arrived packet
out_port = fields['ofproto'].OFPPC_NO_RECV
actions.append(parser.OFPActionOutput(out_port))
return actions
#More work is required here to implement active testing for NATs etc.
# Note fields object must be completely rewritten for crafted packet
# Probably need to make fields['ptype'] = ['arp', 'ipv4']
def _build_pkt(self, fields):
pkt_out = packet.Packet()
pkt_out.add_protocol(ethernet.ethernet(ethertype=fields['ethtype'],
dst=fields['dstmac'],
src=fields['srcmac']))
# Add if ARP is required
if 'arp' in fields['ptype']:
pkt_out.add_protocol(arp.arp(opcode=arp.ARP_REPLY,
src_mac=fields['srcmac'],
src_ip=fields['srcip'],
dst_mac=fields['dstmac'],
dst_ip=fields['dstip']))
if ipv4 in fields['ptype']:
pkt_out.add_protocol(ipv4.ipv4(dst=fields['dstip'],
src=fields['srcip'],
proto=fields['proto']))
if 'icmp' in fields['ptype']:
pkt_out.add_protocol(icmp.icmp(type_=icmp.ICMP_ECHO_REPLY,
code=icmp.ICMP_ECHO_REPLY_CODE,
csum=0,
data=fields['data']))
if 'tcp' in fields['ptype']:
pkt_out.add_protocol(tcp.tcp(dst_port=fields['dstport'],
bits=fields['bits'],option=fields['opt'],
#=str('\\x00' * 4),
src_port=fields['srcport']))
#pkt.add_protocol('\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\t\
#\n\\x0b\\x0c\\r\\x0e\\x0f\\x10\\x11\\x12\\x13\\x14\\x15\\x16\
#\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f')
self._send_packet(fields['dp'], ops['newport'], pkt_out)
#Receive crafted packet and send it to the switch
def _send_packet(self, datapath, port, pkt_out):
if port == None: print "Port not defined"
#This methods sends the crafted message to the switch
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
pkt_out.serialize()
self.logger.info("packet-out %s" % (pkt_out,))
data = pkt_out.data
actions = [parser.OFPActionOutput(port=port)]
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions,
data=data)
datapath.send_msg(out)
#Clean up and disconnect ports. Controller going down
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def handl_port_stat(self, ev):
switch=SimpleSwitch()
switch.port_status_handler(ev)
