def _handle_PacketIn(event):
global server_index
packet = event.parsed
# Only handle IPv4 flows
if (not event.parsed.find("ipv4")):
return EventContinue
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet)
# Only handle traffic destined to virtual IP
if (msg.match.nw_dst != virtual_ip):
return EventContinue
# Round robin selection of servers
index = server_index % total_servers
print index
selected_server_ip = server[index]['ip']
selected_server_mac = server[index]['mac']
selected_server_outport = server[index]['outport']
server_index += 1
# Setup route to server
msg.buffer_id = event.ofp.buffer_id
msg.in_port = event.port
msg.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, selected_server_ip))
msg.actions.append(of.ofp_action_output(port=selected_server_outport))
event.connection.send(msg)
# Setup reverse route from server
reverse_msg = of.ofp_flow_mod()
reverse_msg.buffer_id = None
reverse_msg.in_port = selected_server_outport
reverse_msg.match = of.ofp_match()
reverse_msg.match.dl_src = selected_server_mac
reverse_msg.match.nw_src = selected_server_ip
reverse_msg.match.tp_src = msg.match.tp_dst
reverse_msg.match.dl_dst = msg.match.dl_src
reverse_msg.match.nw_dst = msg.match.nw_src
reverse_msg.match.tp_dst = msg.match.tp_src
reverse_msg.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, virtual_mac))
reverse_msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, virtual_ip))
reverse_msg.actions.append(of.ofp_action_output(port=msg.in_port))
event.connection.send(reverse_msg)
return EventHalt
def _handle_PacketIn(event):
global server_index
packet = event.parsed
# First make sure the packet is addressed using IPv4
if (not event.parsed.find("ipv4")):
return EventContinue
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet)
# If the ip matches controller virtual ip then continue
if (msg.match.nw_dst != controllerip):
return EventContinue
# Employing round robin algorithm here
index = server_index % total_servers
print index
selected_server_ip = server[index]['ip']
selected_server_mac = server[index]['mac']
selected_server_outport = server[index]['outport']
server_index += 1
# Setup route to server
msg.buffer_id = event.ofp.buffer_id
msg.in_port = event.port
msg.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, selected_server_ip))
msg.actions.append(of.ofp_action_output(port=selected_server_outport))
event.connection.send(msg)
# Once the last server is reached, reverse the route
reverse_msg = of.ofp_flow_mod()
reverse_msg.buffer_id = None
reverse_msg.in_port = selected_server_outport
reverse_msg.match = of.ofp_match()
reverse_msg.match.dl_src = selected_server_mac
reverse_msg.match.nw_src = selected_server_ip
reverse_msg.match.tp_src = msg.match.tp_dst
reverse_msg.match.dl_dst = msg.match.dl_src
reverse_msg.match.nw_dst = msg.match.nw_src
reverse_msg.match.tp_dst = msg.match.tp_src
reverse_msg.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, controllermac))
reverse_msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, controllerip))
reverse_msg.actions.append(of.ofp_action_output(port=msg.in_port))
event.connection.send(reverse_msg)
return EventHalt
def packet_handler(event):
global server_no
packet = event.parsed
# Only handle traffic destined to virtual IP
if (not event.parsed.find("ipv4")):
return event_cont
message = of.ofp_flow_mod()
message.match = of.ofp_match.from_packet(packet)
# Handing requests routed to the Load Balancer Ip
if (message.match.nw_dst != load_balancer_hardcoded_ip):
return event_cont
# Random selection of servers
iterator = random.randint(0, server_no - 1)
print iterator
serverip = topology_server[iterator]['ip']
selected_server_mac = topology_server[iterator]['mac']
server_output = topology_server[iterator]['outport']
# Route followed to server
message.buffer_id = event.ofp.buffer_id
message.in_port = event.port
message.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
message.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST,
serverip))
message.actions.append(of.ofp_action_output(port=server_output))
event.connection.send(message)
# Route from server to load balancer
reply = of.ofp_flow_mod()
reply.buffer_id = None
reply.in_port = server_output
reply.match = of.ofp_match()
reply.match.dl_src = selected_server_mac
reply.match.nw_src = serverip
reply.match.tp_src = message.match.tp_dst
reply.match.dl_dst = message.match.dl_src
reply.match.nw_dst = message.match.nw_src
reply.match.tp_dst = message.match.tp_src
reply.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, virtual_mac))
reply.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, load_balancer_hardcoded_ip))
reply.actions.append(of.ofp_action_output(port=message.in_port))
event.connection.send(reply)
return EventHalt
def _handle_PacketIn (event):
global server_index
packet = event.parsed
# Only handle IPv4 flows
if (not event.parsed.find("ipv4")):
return EventContinue
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet)
# Only handle traffic destined to virtual IP
if (msg.match.nw_dst != virtual_ip):
return EventContinue
# Round robin selection of servers
index = server_index % total_servers
print index
selected_server_ip = server[index]['ip']
selected_server_mac = server[index]['mac']
selected_server_outport = server[index]['outport']
server_index += 1
# Setup route to server
msg.buffer_id = event.ofp.buffer_id
msg.in_port = event.port
msg.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
msg.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, selected_server_ip))
msg.actions.append(of.ofp_action_output(port = selected_server_outport))
event.connection.send(msg)
# Setup reverse route from server
reverse_msg = of.ofp_flow_mod()
reverse_msg.buffer_id = None
reverse_msg.in_port = selected_server_outport
reverse_msg.match = of.ofp_match()
reverse_msg.match.dl_src = selected_server_mac
reverse_msg.match.nw_src = selected_server_ip
reverse_msg.match.tp_src = msg.match.tp_dst
reverse_msg.match.dl_dst = msg.match.dl_src
reverse_msg.match.nw_dst = msg.match.nw_src
reverse_msg.match.tp_dst = msg.match.tp_src
reverse_msg.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, virtual_mac))
reverse_msg.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, virtual_ip))
reverse_msg.actions.append(of.ofp_action_output(port = msg.in_port))
event.connection.send(reverse_msg)
return EventHalt
def CreateActions(self, actions, entry, outbound):
if outbound:
actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, self.if_external))
actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, NAT_IP_EXTERNAL))
actions.append(of.ofp_action_tp_port(of.OFPAT_SET_TP_SRC, entry["natport"]))
actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, GetMACFromIP(entry["extip"])))
actions.append(of.ofp_action_output(port=self.port_external))
else:
actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, self.if_external))
actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, entry["int"]))
actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, entry["intip"]))
actions.append(of.ofp_action_tp_port(of.OFPAT_SET_TP_DST, entry["intport"]))
actions.append(of.ofp_action_output(port=GetPortFromIP(entry["intip"])))
def _match_action(self,msg):
if len(self.actions) == 1 and self.actions[0] == "" :
return
for action in self.actions:
action_name = action.split('=')[0]
if action_name != "STRIP_VLAN":
action_argu = action.split('=')[1]
if(action_name == "OUTPUT"):
msg.actions.append(of.ofp_action_output(port = int(action_argu)))
elif(action_name == "ENQUEUE"):
port = action_argu.split(':')[0]
queue_id = action_argu.split(':')[1]
msg.actions.append(of.ofp_action_enqueue(port = int(port) , queue_id = int(queue_id)))
elif(action_name == "STRIP_VLAN"):
msg.actions.append(of.ofp_action_strip_vlan())
elif(action_name == "SET_VLAN_VID"):
msg.actions.append(of.ofp_action_vlan_vid(vlan_vid = int(action_argu)))
elif(action_name == "SET_VLAN_PCP"):
msg.actions.append(of.ofp_action_vlan_pcp(vlan_pcp = int(action_argu)))
elif(action_name == "SET_DL_SRC"):
msg.actions.append(of.ofp_action_dl_addr(type = 4 , dl_addr = EthAddr(action_argu)))
elif(action_name == "SET_DL_DST"):
msg.actions.append(of.ofp_action_dl_addr(type = 5 , dl_addr = EthAddr(action_argu)))
elif(action_name == "SET_NW_TOS"):
msg.actions.append(of.ofp_action_nw_tos(nw_tos = int(action_argu)))
elif(action_name == "SET_NW_SRC"):
msg.actions.append(of.ofp_action_nw_addr(type = 6 , nw_addr = IPAddr(action_argu)))
elif(action_name == "SET_NW_DST"):
msg.actions.append(of.ofp_action_nw_addr(type = 7 , nw_addr = IPAddr(action_argu)))
elif(action_name == "SET_TP_SRC"):
msg.actions.append(of.ofp_action_tp_port(type = 9 , tp_port = int(action_argu)))
elif(action_name == "SET_TP_DST"):
msg.actions.append(of.ofp_action_tp_port(type = 10 , tp_port = int(action_argu)))
def Round_Robin(event):
global ServerUsed
global server_virtual_ip
global server_virtual_mac
packet = event.parsed
msg_to_server = of.ofp_flow_mod()
msg_to_server.match = of.ofp_match.from_packet(packet)
if (event.parsed.find("ipv4")) and (msg_to_server.match.nw_dst == server_virtual_ip):
print ('Server in Service => Server :', ServerUsed)
server_ip = serverList[ServerUsed] ['ip']
print ('With IP => ServerIP = :', server_ip)
server_mac= serverList[ServerUsed]['mac']
server_outport= serverList[ServerUsed]['port']
# Setup route to server
# setup_route_to_server(event,msg_to_server,server_mac,server_ip,server_outport)
msg_to_server.buffer_id = event.ofp.buffer_id
msg_to_server.in_port = event.port
msg_to_server.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, server_mac))
msg_to_server.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, server_ip))
msg_to_server.actions.append(of.ofp_action_output(port = server_outport))
event.connection.send(msg_to_server)
# Setup reverse route from server
# setup_route_from_server(event,msg_to_server,server_mac,server_ip,server_outport)
msg_from_server = of.ofp_flow_mod()
def forward_pkt_to_next_hop(self, packet, match, event, route, justSend = False):
ipp = packet.find("ipv4")
if ipp.ttl <= 1:
return self.send_icmp_ttl_exceed(packet, match, event)
nextHopIp = route.nextHopIpAddr if str(route.nextHopIpAddr) not in self.myips else match.nw_dst
if not justSend and nextHopIp not in self.arpTable:
self.send_arp_request(event, route, packet, match, nextHopIp)
q = self.queuedMsgForArp.get(nextHopIp, [])
q.append([packet, match, event, route])
self.queuedMsgForArp[nextHopIp] = q
return
if nextHopIp not in self.arpTable:
log.info("%s: mac for nexthopip(%s) is not present in arptable(%s). returning"%(self.name, nextHopIp, self.arpTable))
nextHopAddr = self.arpTable[nextHopIp]
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet, event.port)
#import pdb; pdb.set_trace()
log.debug("%s: intf: %s, ,port2Mac: %s, intf2Port: %s, dst: %s", self.name, route.intf, self.port2Mac, self.intf2Port, nextHopAddr)
#msg.actions.append(action)
action = of.ofp_action_dl_addr()
msg.actions.append(action.set_dst(nextHopAddr))
msg.actions.append(action.set_src(self.port2Mac[self.intf2Port[route.intf]]))
msg.actions.append(of.ofp_action_output(port = self.intf2Port[route.intf]))
msg.data = event.ofp
event.connection.send(msg)
def alter_ethernet_address(addr: str, src: bool) -> "Action":
"""
if src is true, the src is altered.
if src is false, the destination is altered.
"""
type = 4 if src else 5
return of.ofp_action_dl_addr(type, addr)
def forward_pkt_to_next_hop(self,
packet,
match,
event,
route,
justSend=False):
ipp = packet.find("ipv4")
if ipp.ttl <= 1:
return self.send_icmp_ttl_exceed(packet, match, event)
nextHopIp = route.nextHopIpAddr if str(
route.nextHopIpAddr) not in self.myips else match.nw_dst
if not justSend and nextHopIp not in self.arpTable:
self.send_arp_request(event, route, packet, match, nextHopIp)
q = self.queuedMsgForArp.get(nextHopIp, [])
q.append([packet, match, event, route])
self.queuedMsgForArp[nextHopIp] = q
return
if nextHopIp not in self.arpTable:
log.info(
"%s: mac for nexthopip(%s) is not present in arptable(%s). returning"
% (self.name, nextHopIp, self.arpTable))
nextHopAddr = self.arpTable[
nextHopIp] #ROUTERS_IP_2_PORT[str(route.nextHopIpAddr)] if str(route.nextHopIpAddr) not in self.myips or nextHopIp not in self.arpTable else self.arpTable[nextHopIp]
# ipp.ttl = ipp.ttl - 1
# # packet_in = event.ofp
#
# e = packet#pkt.ethernet()
# e.src = self.port2Mac[self.intf2Port[route.intf]]
# e.dst = nextHopAddr
# # e.type = e.IP_TYPE
#
# # e.payload = ipp
#
# msg = of.ofp_packet_out()
# msg.actions.append(of.ofp_action_output(port = self.intf2Port[route.intf]))
# msg.data = e#vent.ofp
# # msg.in_port = event.port
# event.connection.send(msg)
# return
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet, event.port)
#import pdb; pdb.set_trace()
log.debug("%s: intf: %s, ,port2Mac: %s, intf2Port: %s, dst: %s",
self.name, route.intf, self.port2Mac, self.intf2Port,
nextHopAddr)
#msg.actions.append(action)
action = of.ofp_action_dl_addr()
msg.actions.append(action.set_dst(nextHopAddr))
msg.actions.append(
action.set_src(self.port2Mac[self.intf2Port[route.intf]]))
msg.actions.append(
of.ofp_action_output(port=self.intf2Port[route.intf]))
msg.data = event.ofp
event.connection.send(msg)
def send_ofmod_modify_forward(self, _called_from, conn, nw_src, nw_dst,
tp_dst, new_dst, new_dl_dst, fport,
duration):
msg = of.ofp_flow_mod()
msg.priority = 0x7000
msg.match.dl_type = 0x800 # Ethertype / length (e.g. 0x0800 = IPv4)
msg.match.nw_src = IPAddr(nw_src)
msg.match.nw_dst = IPAddr(nw_dst)
msg.match.nw_proto = 17 #UDP
if tp_dst != None:
msg.match.tp_dst = int(tp_dst)
msg.idle_timeout = duration[0]
msg.hard_timeout = duration[1]
if _called_from == 'packet_in':
msg.buffer_id = event.ofp.buffer_id
msg.actions.append(
of.ofp_action_nw_addr(nw_addr=IPAddr(new_dst), type=7))
msg.actions.append(
of.ofp_action_dl_addr(dl_addr=EthAddr(new_dl_dst), type=5))
msg.actions.append(of.ofp_action_output(port=fport))
conn.send(msg)
print '\nsend_ofmod_modify_forward to sw_dpid=%s' % conn.dpid
print 'wcs: src_ip=%s, dst_ip=%s, tp_dst=%s' % (nw_src, nw_dst, tp_dst)
print 'acts: new_dst=%s, new_dl_dst=%s, fport=%s\n' % (
new_dst, new_dl_dst, fport)
def _match_action(self,msg):
if(self.actions == "OUTPUT"):
msg.actions.append(of.ofp_action_output(port = int(self.actions_argu)))
elif(self.actions == "enqueue"):
port = self.actions_argu.split(':')[0]
queue_id = self.actions_argu.split(':')[1]
msg.actions.append(of.ofp_action_enqueue(port = int(port) , queue_id = int(queue_id)))
elif(self.actions == "strip-vlan"):
msg.actions.append(of.ofp_action_strip_vlan())
elif(self.actions == "set-vlan-id"):
msg.actions.append(of.ofp_action_vlan_vid(vlan_vid = int(self.actions_argu)))
elif(self.actions == "set-vlan-priority"):
msg.actions.append(of.ofp_action_vlan_pcp(vlan_pcp = int(self.actions_argu)))
elif(self.actions == "SET_DL_SRC"):
msg.actions.append(of.ofp_action_dl_addr(type = 4 , dl_addr = EthAddr(self.actions_argu)))
elif(self.actions == "SET_DL_DST"):
msg.actions.append(of.ofp_action_dl_addr(type = 5 , dl_addr = EthAddr(self.actions_argu)))
elif(self.actions == "SET_NW_TOS"):
msg.actions.append(of.ofp_action_nw_tos(nw_tos = int(self.actions_argu)))
elif(self.actions == "SET_NW_SRC"):
msg.actions.append(of.ofp_action_nw_addr(type = 6 , nw_addr = IPAddr(self.actions_argu)))
elif(self.actions == "SET_NW_DST"):
msg.actions.append(of.ofp_action_nw_addr(type = 7 , nw_addr = IPAddr(self.actions_argu)))
elif(self.actions == "SET_TP_SRC"):
msg.actions.append(of.ofp_action_tp_port(type = 9 , tp_port = int(self.actions_argu)))
elif(self.actions == "SET_TP_DST"):
msg.actions.append(of.ofp_action_tp_port(type = 10 , tp_port = int(self.actions_argu)))
def CreateActions(self, actions, entry, outbound):
if outbound:
actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, self.if_external))
actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, NAT_IP_EXTERNAL))
actions.append(
of.ofp_action_tp_port(of.OFPAT_SET_TP_SRC, entry["natport"]))
actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST,
GetMACFromIP(entry["extip"])))
actions.append(of.ofp_action_output(port=self.port_external))
else:
actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, self.if_external))
actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, entry["int"]))
actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, entry["intip"]))
actions.append(
of.ofp_action_tp_port(of.OFPAT_SET_TP_DST, entry["intport"]))
actions.append(
of.ofp_action_output(port=GetPortFromIP(entry["intip"])))
def send_ofmod_modify_forward (_called_from, conn, nw_src, nw_dst, tp_dst, new_dst, new_dl_dst,o_port, duration):
msg = of.ofp_flow_mod()
msg.priority = 0x7000
msg.match.dl_type = 0x800 # Ethertype / length (e.g. 0x0800 = IPv4)
msg.match.nw_src = IPAddr(nw_src)
msg.match.nw_dst = IPAddr(nw_dst)
msg.match.nw_proto = 17 #UDP
if tp_dst != None:
msg.match.tp_dst = int(tp_dst)
msg.idle_timeout = duration[0]
msg.hard_timeout = duration[1]
if _called_from == 'packet_in':
msg.buffer_id = event.ofp.buffer_id
msg.actions.append(of.ofp_action_nw_addr(nw_addr = IPAddr(new_dst), type=7))
msg.actions.append(of.ofp_action_dl_addr(dl_addr = EthAddr(new_dl_dst), type=5))
msg.actions.append(of.ofp_action_output(port = o_port))
conn.send(msg)
print "\nFrom dpid: ", conn.dpid, "send_ofmod_modify_forward", "src_ip: ",nw_src,
print " dst_ip: ",nw_dst," tp_dst: ",tp_dst," new_dst_ip: ",new_dst, " new_dst_mac: ", new_dl_dst, " fport: ", o_port, " is sent\n"
def send_ofmod_modify_forward(self, _called_from, conn, nw_src, nw_dst, tp_dst, new_dst, new_dl_dst,fport, duration):
msg = of.ofp_flow_mod()
msg.priority = 0x7000
msg.match.dl_type = 0x800 # Ethertype / length (e.g. 0x0800 = IPv4)
msg.match.nw_src = IPAddr(nw_src)
msg.match.nw_dst = IPAddr(nw_dst)
msg.match.nw_proto = 17 #UDP
if tp_dst != None:
msg.match.tp_dst = int(tp_dst)
msg.idle_timeout = duration[0]
msg.hard_timeout = duration[1]
if _called_from == 'packet_in':
msg.buffer_id = event.ofp.buffer_id
msg.actions.append(of.ofp_action_nw_addr(nw_addr = IPAddr(new_dst), type=7))
msg.actions.append(of.ofp_action_dl_addr(dl_addr = EthAddr(new_dl_dst), type=5))
msg.actions.append(of.ofp_action_output(port = fport))
conn.send(msg)
print '\nsend_ofmod_modify_forward to sw_dpid=%s' % conn.dpid
print 'wcs: src_ip=%s, dst_ip=%s, tp_dst=%s' % (nw_src,nw_dst,tp_dst)
print 'acts: new_dst=%s, new_dl_dst=%s, fport=%s\n' % (new_dst, new_dl_dst, fport)
def send_ofmod_modify_forward (self, _called_from, conn, nw_src, nw_dst,
tp_dst, new_dst, new_dl_dst, o_port, duration):
msg = of.ofp_flow_mod()
msg.priority = 0x7000
msg.match.dl_type = 0x800 # Ethertype / length (e.g. 0x0800 = IPv4)
msg.match.nw_src = IPAddr(nw_src)
msg.match.nw_dst = IPAddr(nw_dst)
if tp_dst != None:
msg.match.nw_proto = 17 #UDP
msg.match.tp_dst = int(tp_dst)
msg.idle_timeout = duration[0]
msg.hard_timeout = duration[1]
if _called_from == 'packet_in':
msg.buffer_id = event.ofp.buffer_id
msg.actions.append(of.ofp_action_nw_addr(nw_addr = IPAddr(new_dst), type=7))
msg.actions.append(of.ofp_action_dl_addr(dl_addr = EthAddr(new_dl_dst), type=5))
msg.actions.append(of.ofp_action_output(port = o_port))
conn.send(msg)
print "\nFrom dpid: ", conn.dpid, "send_ofmod_modify_forward", "src_ip: ", \
nw_src," dst_ip: ",nw_dst," tp_dst: ",tp_dst," new_dst_ip: ",new_dst, \
" new_dst_mac: ", new_dl_dst, " fport: ", o_port, " is sent\n"
def _match_action(self, msg):
if len(self.actions) == 1 and self.actions[0] == "":
return
for action in self.actions:
action_name = action.split('=')[0]
if action_name != "STRIP_VLAN":
action_argu = action.split('=')[1]
if (action_name == "OUTPUT"):
msg.actions.append(of.ofp_action_output(port=int(action_argu)))
elif (action_name == "ENQUEUE"):
port = action_argu.split(':')[0]
queue_id = action_argu.split(':')[1]
msg.actions.append(
of.ofp_action_enqueue(port=int(port),
queue_id=int(queue_id)))
elif (action_name == "STRIP_VLAN"):
msg.actions.append(of.ofp_action_strip_vlan())
elif (action_name == "SET_VLAN_VID"):
msg.actions.append(
of.ofp_action_vlan_vid(vlan_vid=int(action_argu)))
elif (action_name == "SET_VLAN_PCP"):
msg.actions.append(
of.ofp_action_vlan_pcp(vlan_pcp=int(action_argu)))
elif (action_name == "SET_DL_SRC"):
msg.actions.append(
of.ofp_action_dl_addr(type=4,
dl_addr=EthAddr(action_argu)))
elif (action_name == "SET_DL_DST"):
msg.actions.append(
of.ofp_action_dl_addr(type=5,
dl_addr=EthAddr(action_argu)))
elif (action_name == "SET_NW_TOS"):
msg.actions.append(
of.ofp_action_nw_tos(nw_tos=int(action_argu)))
elif (action_name == "SET_NW_SRC"):
msg.actions.append(
of.ofp_action_nw_addr(type=6, nw_addr=IPAddr(action_argu)))
elif (action_name == "SET_NW_DST"):
msg.actions.append(
of.ofp_action_nw_addr(type=7, nw_addr=IPAddr(action_argu)))
elif (action_name == "SET_TP_SRC"):
msg.actions.append(
of.ofp_action_tp_port(type=9, tp_port=int(action_argu)))
elif (action_name == "SET_TP_DST"):
msg.actions.append(
of.ofp_action_tp_port(type=10, tp_port=int(action_argu)))
def packet_handler (event):
global count_server
packet = event.parsed
# Only handle IPv4 flows
if (not event.parsed.find("ipv4")):
return event_cont
message = of.ofp_flow_mod()
message.match = of.ofp_match.from_packet(packet)
# Only handle traffic destined to virtual IP
if (message.match.nw_dst != load_balancer_hardcoded_ip):
return event_cont
# Implementing Weighted Round robin Server Selection
iterator = count_server % 6
print iterator
if(iterator < topology_server[0]['weight']):
serverip = topology_server[0]['ip']
selected_server_mac = topology_server[0]['mac']
server_output = topology_server[0]['outport']
elif(iterator < (topology_server[0]['weight']+topology_server[1]['weight'])):
serverip = topology_server[1]['ip']
selected_server_mac = topology_server[1]['mac']
server_output = topology_server[1]['outport']
elif(iterator < (server[0]['weight']+server[1]['weight']+server[2]['weight'])):
serverip = server[2]['ip']
selected_server_mac = server[2]['mac']
server_output = server[2]['outport']
count_server += 1
# Route followed to server
message.buffer_id = event.ofp.buffer_id
message.in_port = event.port
message.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
message.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, serverip))
message.actions.append(of.ofp_action_output(port = server_output))
event.connection.send(message)
# Route from server to load balancer
reply = of.ofp_flow_mod()
reply.buffer_id = None
reply.in_port = server_output
reply.match = of.ofp_match()
reply.match.dl_src = selected_server_mac
reply.match.nw_src = serverip
reply.match.tp_src = message.match.tp_dst
reply.match.dl_dst = message.match.dl_src
reply.match.nw_dst = message.match.nw_src
reply.match.tp_dst = message.match.tp_src
reply.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, load_balancer_hardcoded_mac))
reply.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC, load_balancer_hardcoded_ip))
reply.actions.append(of.ofp_action_output(port = message.in_port))
event.connection.send(reply)
return EventHalt
def handle_IPPacket(self, event):
is_src_router = (event.ofp.in_port == of.OFPP_LOCAL)
if event.parsed.next.srcip.inNetwork(NON_ROUTABLE_SUBNET,
NON_ROUTABLE_NETMASK):
print "source ip is not routable"
return
if event.parsed.src != self.bridge_mac and not self.check_access(
event.parsed.src):
print "%s is not permmited" % (str(event.parsed.src))
return
if event.parsed.next.dstip.inNetwork(NON_ROUTABLE_SUBNET,
NON_ROUTABLE_NETMASK):
print "destination is not routable"
return
is_src_local = event.parsed.next.srcip.inNetwork(
ROUTABLE_SUBNET,
ROUTABLE_NETMASK) or event.parsed.next.srcip.inNetwork(
INIT_SUBNET, INIT_NETMASK)
if is_src_local and (event.parsed.next.srcip.toUnsigned(
networkOrder=False) & 0x3) == 1:
if not self.get_DHCP_mapping().is_valid_mapping(
event.parsed.next.srcip,
event.parsed.src) and event.parsed.src != self.bridge_mac:
print "received packet from unrecorded mac address"
return
if event.parsed.next.dstip.inNetwork(MULTICAST_SUBNET,
MULTICAST_NETMASK):
print "multicast"
if event.parsed.next.dstip in self.multicast_ip:
action = of.ofp_action_output(port=of.OFPP_FLOOD)
command = of.OFPFC_ADD
self.send_flow_modification(event,
command, [action],
timeout=30)
# check if broadcast. Change nw_dst to 10.2.255.255
if event.parsed.next.dstip.inNetwork(
ROUTABLE_SUBNET, ROUTABLE_NETMASK) and (
(event.parsed.next.dstip.toUnsigned(networkOrder=False)
& 0x3) == 0x3):
print "broadcast IP"
nw_new = of.ofp_action_nw_addr()
nw_new.type = of.OFPAT_SET_NW_DST
nw_new.nw_addr = IPAddr("10.2.255.255")
out = of.ofp_action_output(
port=of.OFPP_IN_PORT if event.ofp.in_port == 0 else 0)
actions = [out, nw_new]
command = of.OFPFC_ADD
self.send_flow_modification(event, command, actions, timeout=30)
dst_port = 0
if event.parsed.next.dstip.inNetwork(
ROUTABLE_SUBNET, ROUTABLE_NETMASK) and (
(event.parsed.next.dstip.toUnsigned(networkOrder=False)
& 0x01) == 0x01):
dst_port = 1
else:
dst_port = 0
actions = []
is_dst_local = event.parsed.next.dstip.inNetwork(
ROUTABLE_SUBNET,
ROUTABLE_NETMASK) or event.parsed.next.dstip.inNetwork(
INIT_SUBNET, INIT_NETMASK)
if is_dst_local and is_src_local and (dst_port !=
0) and (not is_src_router):
dst_mac = self.get_DHCP_mapping().get_mac(event.parsed.next.dstip)
new_dl_src = of.ofp_action_dl_addr()
new_dl_src.type = of.OFPAT_SET_DL_SRC
new_dl_src.set_src(self.bridge_mac)
actions.append(new_dl_src)
new_dl_dst = of.ofp_action_dl_addr()
new_dl_dst.type = of.OFPAT_SET_DL_DST
new_dl_dst.set_dst(dst_mac)
actions.append(new_dl_dst)
out = of.ofp_action_output(port=of.OFPP_FLOOD)
actions.append(out)
if 0 < event.ofp.in_port and event.ofp.in_port < of.OFPP_MAX:
out_of_in = of.ofp_action_output(port=of.OFPP_IN_PORT)
actions.append(out_of_in)
command = of.OFPFC_ADD
self.send_flow_modification(event, command, actions, timeout=30)
# Setup route to server
setup_route_to_server(event,msg_to_server,server_mac,server_ip,server_outport)
# Setup reverse route from server
setup_route_from_server(event,msg_to_server,server_mac,server_ip,server_outport)
return EventHalt
else:
return EventContinue
def setup_route_to_server(event,msg_to_server,server_mac,server_ip,server_outport):
msg_to_server.buffer_id = event.ofp.buffer_id
msg_to_server.in_port = event.port
msg_to_server.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, server_mac))
msg_to_server.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST, server_ip))
msg_to_server.actions.append(of.ofp_action_output(port = server_outport))
event.connection.send(msg_to_server)
def setup_route_from_server(event,msg_to_server,server_mac,server_ip,server_outport):
global ServerUsed
msg_from_server = of.ofp_flow_mod()
msg_from_server.buffer_id = None
msg_from_server.in_port = server_outport
msg_from_server.match = of.ofp_match()
msg_from_server.match.dl_src = server_mac
msg_from_server.match.nw_src = server_ip
msg_from_server.match.tp_src = msg_to_server.match.tp_dst
def handle_IPPacket( self, event ):
is_src_router = (event.ofp.in_port == of.OFPP_LOCAL) # @UndefinedVariable
if event.parsed.next.srcip.inNetwork(NON_ROUTABLE_SUBNET, NON_ROUTABLE_NETMASK):
print "source ip is not routable"
return
if event.parsed.src != self.bridge_mac and not self.check_access(event.parsed.src):
print "%s is not permmited" % (str(event.parsed.src))
return
if event.parsed.next.dstip.inNetwork(NON_ROUTABLE_SUBNET, NON_ROUTABLE_NETMASK):
print "destination is not routable"
return
is_src_local = event.parsed.next.srcip.inNetwork(ROUTABLE_SUBNET, ROUTABLE_NETMASK) or event.parsed.next.srcip.inNetwork(INIT_SUBNET, INIT_NETMASK)
if is_src_local and (event.parsed.next.srcip.toUnsigned(networkOrder=False) & 0x3) == 1:
if not self.get_DHCP_mapping().is_valid_mapping(event.parsed.next.srcip, event.parsed.src) and event.parsed.src != self.bridge_mac:
print "received packet from unrecorded mac address"
return
if event.parsed.next.dstip.inNetwork(MULTICAST_SUBNET, MULTICAST_NETMASK):
print "multicast"
if event.parsed.next.dstip in self.multicast_ip:
action = of.ofp_action_output(port=of.OFPP_FLOOD) # @UndefinedVariable
command = of.OFPFC_ADD # @UndefinedVariable
self.send_flow_modification(event, command, [action], timeout=30)
# check if broadcast. Change nw_dst to 10.2.255.255
if event.parsed.next.dstip.inNetwork(ROUTABLE_SUBNET, ROUTABLE_NETMASK) and ((event.parsed.next.dstip.toUnsigned(networkOrder=False) & 0x3) == 0x3):
print "broadcast IP"
nw_new = of.ofp_action_nw_addr()
nw_new.type = of.OFPAT_SET_NW_DST # @UndefinedVariable
nw_new.nw_addr = IPAddr("10.2.255.255")
out = of.ofp_action_output(port=of.OFPP_IN_PORT if event.ofp.in_port == 0 else 0) # @UndefinedVariable
actions = [out, nw_new]
command = of.OFPFC_ADD # @UndefinedVariable
self.send_flow_modification(event, command, actions, timeout=30)
dst_port = 0
if event.parsed.next.dstip.inNetwork(ROUTABLE_SUBNET, ROUTABLE_NETMASK) and ((event.parsed.next.dstip.toUnsigned(networkOrder=False) & 0x01) == 0x01):
dst_port = 1
else:
dst_port = 0
actions = []
is_dst_local = event.parsed.next.dstip.inNetwork(ROUTABLE_SUBNET, ROUTABLE_NETMASK) or event.parsed.next.dstip.inNetwork(INIT_SUBNET, INIT_NETMASK)
if is_dst_local and is_src_local and (dst_port != 0) and (not is_src_router):
dst_mac = self.get_DHCP_mapping().get_mac(event.parsed.next.dstip)
new_dl_src = of.ofp_action_dl_addr()
new_dl_src.type = of.OFPAT_SET_DL_SRC # @UndefinedVariable
new_dl_src.set_src(self.bridge_mac)
actions.append(new_dl_src)
new_dl_dst = of.ofp_action_dl_addr()
new_dl_dst.type = of.OFPAT_SET_DL_DST # @UndefinedVariable
new_dl_dst.set_dst(dst_mac)
actions.append(new_dl_dst)
out = of.ofp_action_output(port=of.OFPP_FLOOD) # @UndefinedVariable
actions.append(out)
if 0 < event.ofp.in_port and event.ofp.in_port < of.OFPP_MAX: # @UndefinedVariable
out_of_in = of.ofp_action_output(port=of.OFPP_IN_PORT) # @UndefinedVariable
actions.append(out_of_in)
command = of.OFPFC_ADD # @UndefinedVariable
self.send_flow_modification(event, command, actions, timeout=30)
def _modify_flow(self,command_type):
msg = of.ofp_flow_mod()
print self.payload
if command_type == "MOD_ST":
msg.command = of.OFPFC_MODIFY_STRICT
elif command_type == "MOD":
msg.command = of.OFPFC_MODIFY
if self.payload.has_key("wildcards"):
msg.match.wildcards = int(self.payload['wildcards'])
if self.payload.has_key("dstIP"):
msg.match.nw_dst = IPAddr(self.payload['dstIP'])
if self.payload.has_key("srcMac"):
msg.match.dl_src = EthAddr(self.payload['srcMac'])
if self.payload.has_key("srcIP"):
msg.match.nw_src = IPAddr(self.payload['srcIP'])
if self.payload.has_key("dstMac"):
msg.match.dl_dst = EthAddr(self.payload['dstMac'])
if self.payload.has_key("hardTimeout"):
msg.hard_timeout = int(self.payload['hardTimeout'])
if self.payload.has_key("srcPort"):
msg.match.tp_src = int(self.payload['srcPort'])
if self.payload.has_key("priority"):
msg.priority = int(self.payload['priority'])
if self.payload.has_key("ingressPort"):
msg.match.in_port = int(self.payload['ingressPort'])
if self.payload.has_key("vlan"):
msg.match.dl_vlan = int(self.payload['vlan'])
if self.payload.has_key("ether-type"):
msg.match.dl_type = int(self.payload['ether-type'])
if self.payload.has_key("duration"):
msg.duration_sec = int(self.payload['duration'])
if self.payload.has_key("idleTimeout"):
msg.idle_timeout = int(self.payload['idleTimeout'])
if self.payload.has_key("netProtocol"):
msg.match.nw_proto = int(self.payload['netProtocol'])
self.dpid = self.payload['switch'].replace(':','-')[6:]
self._parse_actions(self.payload['actions'])
for connection in core.openflow._connections.values() :
# print dpidToStr(connection.dpid)
conn_dpid = str(dpidToStr(connection.dpid))
print conn_dpid
if conn_dpid == self.dpid:
"""match actions"""
if(self.actions == "OUTPUT"):
msg.actions.append(of.ofp_action_output(port = int(self.actions_argu)))
elif(self.actions == "enqueue"):
port = self.actions_argu.split(':')[0]
queue_id = self.actions_argu.split(':')[1]
msg.actions.append(of.ofp_action_enqueue(port = int(port) , queue_id = int(queue_id)))
elif(self.actions == "strip-vlan"):
msg.actions.append(of.ofp_action_strip_vlan())
elif(self.actions == "set-vlan-id"):
msg.actions.append(of.ofp_action_vlan_vid(vlan_vid = int(self.actions_argu)))
elif(self.actions == "set-vlan-priority"):
msg.actions.append(of.ofp_action_vlan_pcp(vlan_pcp = int(self.actions_argu)))
elif(self.actions == "SET_DL_SRC"):
msg.actions.append(of.ofp_action_dl_addr(type = 4 , dl_addr = EthAddr(self.actions_argu)))
elif(self.actions == "SET_DL_DST"):
msg.actions.append(of.ofp_action_dl_addr(type = 5 , dl_addr = EthAddr(self.actions_argu)))
elif(self.actions == "SET_NW_TOS"):
msg.actions.append(of.ofp_action_nw_tos(nw_tos = int(self.actions_argu)))
elif(self.actions == "SET_NW_SRC"):
msg.actions.append(of.ofp_action_nw_addr(type = 6 , nw_addr = IPAddr(self.actions_argu)))
elif(self.actions == "SET_NW_DST"):
msg.actions.append(of.ofp_action_nw_addr(type = 7 , nw_addr = IPAddr(self.actions_argu)))
elif(self.actions == "SET_TP_SRC"):
msg.actions.append(of.ofp_action_tp_port(type = 9 , tp_port = int(self.actions_argu)))
elif(self.actions == "SET_TP_DST"):
msg.actions.append(of.ofp_action_tp_port(type = 10 , tp_port = int(self.actions_argu)))
connection.send(msg)
def _handle_PacketIn(self, event):
"""
Handle packet in messages from the switch to implement above algorithm.
"""#52:54:00:79:95:26 26:6a:fb:3c:f8:fd
cptv = server_infos(conf.captive_portal.ip, conf.captive_portal.mac,
conf.captive_portal.switch_port,
conf.captive_portal.tcp_port
) #"130.192.225.168","52:54:00:79:95:26",5,8085)
#cptv = server_infos("130.192.225.156","88:51:fb:42:2b:f8",5,8080)
if self.connection.dpid not in switchs_info:
lock.acquire()
try:
dpi = DPI()
dpi.setDPI(self.connection.dpid)
# add a new switch to our infos
switchs_info[self.connection.dpid] = switch_infos(
self.connection)
finally:
lock.release() # release lock, no matter what
switch = switchs_info[self.connection.dpid]
if event.port not in switch.ports_info:
lock.acquire()
try:
#print (dpid_to_str(self.connection.dpid))
#print self.connection.sock.getpeername()[0]
switch.ports_info[event.port] = port_infos(event.port)
finally:
lock.release() # release lock, no matter what
#if event.port == conf.my_infos.my_default_GRE_tunnel:
is_user_port = True
log.info("Comparing the ports speaking " + str(event.port))
for not_user_port in conf.my_infos.not_user_ports:
if str(event.port) == str(not_user_port):
is_user_port = False
break
if not is_user_port:
log.info("Event port is " + str(event.port))
log.info("First for the ethernet interface")
# First rule: allow all traffic
self.connection.send(
of.ofp_flow_mod(
action=of.ofp_action_output(port=of.OFPP_NORMAL),
priority=1,
match=of.ofp_match(in_port=event.port)))
else:
"""
Packet from user
"""
log.info("First packet from user")
# First rule: drop all traffic
msg = of.ofp_flow_mod()
msg.priority = 1
msg.match.in_port = event.port
msg.actions.append(of.ofp_action_output(port=of.OFPP_NONE))
self.connection.send(msg)
# Second rule: normal process for DNS traffic
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 17
msg.match.tp_dst = 53
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Third rule: normal process for ARP traffic
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x806
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Fourth rule: normal process for DHCPDISCOVER
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 17
msg.match.nw_src = "0.0.0.0"
msg.match.nw_dst = "255.255.255.255"
msg.match.tp_src = 68
msg.match.tp_dst = 67
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Fifth rule: send the HTTP traffic to the controller
msg = of.ofp_flow_mod()
msg.priority = 1000
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 6
msg.match.tp_dst = 80
msg.actions.append(
of.ofp_action_output(port=of.OFPP_CONTROLLER))
msg.data = event.ofp
self.connection.send(msg)
packet = event.parsed
if not packet.parsed:
log.info("ignoring unparsed packet")
return
client_list = switch.ports_info[event.port].clients_info
log.info("LOOP Thread id: " + str(thread.get_ident()))
log.debug("packet.type: " + str(packet.type) +
" || pkt.ethernet.IP_TYPE: " + str(pkt.ethernet.IP_TYPE))
if packet.type == pkt.ethernet.IP_TYPE:
ipv4_hdr = packet.payload
log.debug("ipv4_hdr.protocol: " + str(ipv4_hdr.protocol) +
" || pkt.ipv4.TCP_PROTOCOL: " +
str(pkt.ipv4.TCP_PROTOCOL))
if ipv4_hdr.protocol == pkt.ipv4.TCP_PROTOCOL:
tcp_hdr = ipv4_hdr.payload
log.info("tcp_hdr.dstport: " + str(tcp_hdr.dstport) +
" || DestPort: || 80")
if tcp_hdr.dstport == 80:
log.debug("packet.src: " + str(packet.src))
if packet.src not in client_list:
log.info("packet.src is not in client_list")
lock.acquire()
try:
log.info("save host info: IP=" +
str(ipv4_hdr.srcip) + ", MAC=" +
str(packet.src) +
", INGRESS_SWITCH_PORT=" +
str(switch.infos.ports[event.port].name))
client_list[packet.src] = host_infos(
ipv4_hdr.srcip, packet.src, event.port, 0)
finally:
lock.release() # release lock, no matter what
else:
log.debug("PACKET_IN INFOs: user MAC: " +
str(packet.src) + ", user IP: " +
str(ipv4_hdr.srcip))
user_infos = client_list[packet.src]
user_ip = user_infos.IP
log.debug("Local informations: user MAC: " +
str(packet.src) + ", user IP: " +
str(user_ip))
if user_ip != ipv4_hdr.srcip:
log.debug("Updating client IP informations")
user_infos.IP = ipv4_hdr.srcip
client = client_list[packet.src]
if (client.flag_auth == 0):
log.info(
"installing new flow to set destination IP to captive portal IP"
)
msg = of.ofp_flow_mod()
msg.priority = 10000
msg.idle_timeout = 30
msg.match.dl_type = 0x800
msg.match.dl_src = client.MAC
msg.match.nw_proto = 6
#Adding the match on the TCP source port of the user, in order to genererate a PACKET_IN for every
#new TCP connection
msg.match.tp_src = tcp_hdr.srcport
msg.match.tp_dst = 80
msg.match.nw_dst = ipv4_hdr.dstip
msg.match.in_port = event.port
msg.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST,
cptv.MAC))
msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST,
cptv.IP))
msg.actions.append(
of.ofp_action_tp_port(of.OFPAT_SET_TP_DST,
cptv.port))
msg.actions.append(
of.ofp_action_output(port=cptv.switch_port))
#msg.data = event.ofp
self.connection.send(msg)
log.info("installing new flow to set return path")
msg = of.ofp_flow_mod()
msg.priority = 10000
msg.idle_timeout = 30
msg.match.dl_type = 0x800
msg.match.nw_proto = 6
msg.match.tp_dst = tcp_hdr.srcport
msg.match.nw_dst = ipv4_hdr.srcip
msg.match.nw_src = cptv.IP
msg.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC,
ipv4_hdr.dstip))
msg.actions.append(
of.ofp_action_tp_port(of.OFPAT_SET_TP_SRC,
tcp_hdr.dstport))
msg.actions.append(
of.ofp_action_output(port=event.port))
msg.data = event.ofp
self.connection.send(msg)
'''
def _modify_flow(self, command_type):
msg = of.ofp_flow_mod()
print self.payload
if command_type == "MOD_ST":
msg.command = of.OFPFC_MODIFY_STRICT
elif command_type == "MOD":
msg.command = of.OFPFC_MODIFY
if self.payload.has_key("wildcards"):
msg.match.wildcards = int(self.payload['wildcards'])
if self.payload.has_key("dstIP"):
msg.match.nw_dst = IPAddr(self.payload['dstIP'])
if self.payload.has_key("srcMac"):
msg.match.dl_src = EthAddr(self.payload['srcMac'])
if self.payload.has_key("srcIP"):
msg.match.nw_src = IPAddr(self.payload['srcIP'])
if self.payload.has_key("dstMac"):
msg.match.dl_dst = EthAddr(self.payload['dstMac'])
if self.payload.has_key("hardTimeout"):
msg.hard_timeout = int(self.payload['hardTimeout'])
if self.payload.has_key("srcPort"):
msg.match.tp_src = int(self.payload['srcPort'])
if self.payload.has_key("priority"):
msg.priority = int(self.payload['priority'])
if self.payload.has_key("ingressPort"):
msg.match.in_port = int(self.payload['ingressPort'])
if self.payload.has_key("vlan"):
msg.match.dl_vlan = int(self.payload['vlan'])
if self.payload.has_key("ether-type"):
msg.match.dl_type = int(self.payload['ether-type'])
if self.payload.has_key("duration"):
msg.duration_sec = int(self.payload['duration'])
if self.payload.has_key("idleTimeout"):
msg.idle_timeout = int(self.payload['idleTimeout'])
if self.payload.has_key("netProtocol"):
msg.match.nw_proto = int(self.payload['netProtocol'])
self.dpid = self.payload['switch'].replace(':', '-')[6:]
self._parse_actions(self.payload['actions'])
for connection in core.openflow._connections.values():
# print dpidToStr(connection.dpid)
conn_dpid = str(dpidToStr(connection.dpid))
print conn_dpid
if conn_dpid == self.dpid:
"""match actions"""
if (self.actions == "OUTPUT"):
msg.actions.append(
of.ofp_action_output(port=int(self.actions_argu)))
elif (self.actions == "enqueue"):
port = self.actions_argu.split(':')[0]
queue_id = self.actions_argu.split(':')[1]
msg.actions.append(
of.ofp_action_enqueue(port=int(port),
queue_id=int(queue_id)))
elif (self.actions == "strip-vlan"):
msg.actions.append(of.ofp_action_strip_vlan())
elif (self.actions == "set-vlan-id"):
msg.actions.append(
of.ofp_action_vlan_vid(
vlan_vid=int(self.actions_argu)))
elif (self.actions == "set-vlan-priority"):
msg.actions.append(
of.ofp_action_vlan_pcp(
vlan_pcp=int(self.actions_argu)))
elif (self.actions == "SET_DL_SRC"):
msg.actions.append(
of.ofp_action_dl_addr(type=4,
dl_addr=EthAddr(
self.actions_argu)))
elif (self.actions == "SET_DL_DST"):
msg.actions.append(
of.ofp_action_dl_addr(type=5,
dl_addr=EthAddr(
self.actions_argu)))
elif (self.actions == "SET_NW_TOS"):
msg.actions.append(
of.ofp_action_nw_tos(nw_tos=int(self.actions_argu)))
elif (self.actions == "SET_NW_SRC"):
msg.actions.append(
of.ofp_action_nw_addr(type=6,
nw_addr=IPAddr(
self.actions_argu)))
elif (self.actions == "SET_NW_DST"):
msg.actions.append(
of.ofp_action_nw_addr(type=7,
nw_addr=IPAddr(
self.actions_argu)))
elif (self.actions == "SET_TP_SRC"):
msg.actions.append(
of.ofp_action_tp_port(type=9,
tp_port=int(self.actions_argu)))
elif (self.actions == "SET_TP_DST"):
msg.actions.append(
of.ofp_action_tp_port(type=10,
tp_port=int(self.actions_argu)))
connection.send(msg)
def _handle_PacketIn(self, event):
balancer_ip = IPAddr("10.0.0.99")
balancer_eth = EthAddr("00:00:00:00:00:99")
packet = event.parsed
packet_in = event.ofp
flow = of.ofp_flow_mod()
flow.match = of.ofp_match.from_packet(packet)
flow.match.in_port = packet_in.in_port
if flow.match.nw_src not in self.dicts:
self.dicts[flow.match.nw_src] = packet_in.in_port
if flow.match.nw_dst == balancer_ip: # if the request is to balancer
print("[Request]: From " + str(flow.match.nw_src) + " to " +
str(flow.match.nw_dst))
if flow.match.in_port == self.ind + 1: # if the chosen server is the same as the client
self.ind = (self.ind + 1) % self.N # shift the server id
ethnum = str(hex(self.ind + 1))
if self.ind < 15:
ethnum = "0" + ethnum[2:len(ethnum)]
else:
ethnum = ethnum[2:len(ethnum)]
ipnum = str(self.ind + 1)
server_port = self.ind + 1
server_ip = IPAddr("10.0.0." + ipnum)
server_eth = EthAddr("00:00:00:00:00:" + ethnum)
print("The chosen server is " + str(server_ip))
print(server_eth)
flow.buffer_id = packet_in.buffer_id
new_ip_dst = of.ofp_action_nw_addr(7, server_ip)
new_eth_dst = of.ofp_action_dl_addr(5, server_eth)
action = of.ofp_action_output(port=server_port)
flow.actions.append(new_ip_dst)
flow.actions.append(new_eth_dst)
self.ind = (self.ind + 1) % self.N
flow.idle_timeout = of.OFP_FLOW_PERMANENT
flow.hard_timeout = of.OFP_FLOW_PERMANENT
flow.priority = 65535
flow.actions.append(action)
event.connection.send(flow)
flow.command = of.OFPFC_DELETE
event.connection.send(flow)
# indicate the current server and client info
self.cur_client = packet_in.in_port
self.cur_ser = server_port
self.request = 1
else:
if flow.match.nw_dst in self.dicts:
outport = self.dicts[flow.match.nw_dst]
else:
outport = of.OFPP_ALL
if outport == self.cur_client and self.request == 1:
#response message
new_ip_src = of.ofp_action_nw_addr(6, balancer_ip)
new_eth_src = of.ofp_action_dl_addr(4, balancer_eth)
action = of.ofp_action_output(port=outport)
flow.buffer_id = packet_in.buffer_id
flow.idle_timeout = of.OFP_FLOW_PERMANENT
flow.hard_timeout = of.OFP_FLOW_PERMANENT
flow.priority = 65535
flow.actions.append(new_ip_src)
flow.actions.append(new_eth_src)
flow.actions.append(action)
event.connection.send(flow)
flow.command = of.OFPFC_DELETE
event.connection.send(flow)
print("[Response]: Server " + str(self.cur_ser) + " response")
self.cur_ser = -1
self.cur_client = -1
self.request = 0
else:
action = of.ofp_action_output(port=outport)
flow.idle_timeout = of.OFP_FLOW_PERMANENT
flow.hard_timeout = of.OFP_FLOW_PERMANENT
flow.priority = 65535
flow.actions.append(action)
if event.ofp.buffer_id != -1:
flow.buffer_id = event.ofp.buffer_id
event.connection.send(flow)
print("Normal Message from " + str(flow.match.nw_src) +
" to " + str(flow.match.nw_dst))
flow.command = of.OFPFC_DELETE
event.connection.send(flow)
return
def _handle_PacketIn (self, event):
"""
Handle packet in messages from the switch to implement above algorithm.
"""#52:54:00:79:95:26 26:6a:fb:3c:f8:fd
cptv = server_infos(conf.captive_portal.ip,conf.captive_portal.mac,conf.captive_portal.switch_port,conf.captive_portal.tcp_port)#"130.192.225.168","52:54:00:79:95:26",5,8085)
#cptv = server_infos("130.192.225.156","88:51:fb:42:2b:f8",5,8080)
if self.connection.dpid not in switchs_info:
lock.acquire()
try:
dpi = DPI()
dpi.setDPI(self.connection.dpid)
# add a new switch to our infos
switchs_info[self.connection.dpid] = switch_infos(self.connection)
finally:
lock.release() # release lock, no matter what
switch = switchs_info[self.connection.dpid]
if event.port not in switch.ports_info:
lock.acquire()
try:
#print (dpid_to_str(self.connection.dpid))
#print self.connection.sock.getpeername()[0]
switch.ports_info[event.port] = port_infos(event.port)
finally:
lock.release() # release lock, no matter what
#if event.port == conf.my_infos.my_default_GRE_tunnel:
is_user_port = True
log.info("Comparing the ports speaking " + str(event.port))
for not_user_port in conf.my_infos.not_user_ports:
if str(event.port) == str(not_user_port):
is_user_port = False
break
if not is_user_port:
log.info("Event port is " + str(event.port))
log.info("First for the ethernet interface")
# First rule: allow all traffic
self.connection.send( of.ofp_flow_mod( action=of.ofp_action_output(port=of.OFPP_NORMAL),
priority=1,
match=of.ofp_match( in_port = event.port)))
else:
"""
Packet from user
"""
log.info("First packet from user")
# First rule: drop all traffic
msg = of.ofp_flow_mod()
msg.priority = 1
msg.match.in_port = event.port
msg.actions.append(of.ofp_action_output(port=of.OFPP_NONE))
self.connection.send(msg)
# Second rule: normal process for DNS traffic
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 17
msg.match.tp_dst = 53
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Third rule: normal process for ARP traffic
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x806
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Fourth rule: normal process for DHCPDISCOVER
msg = of.ofp_flow_mod()
msg.priority = 100
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 17
msg.match.nw_src = "0.0.0.0"
msg.match.nw_dst = "255.255.255.255"
msg.match.tp_src = 68
msg.match.tp_dst = 67
msg.actions.append(of.ofp_action_output(port=of.OFPP_NORMAL))
#msg.data = event.ofp
self.connection.send(msg)
# Fifth rule: send the HTTP traffic to the controller
msg = of.ofp_flow_mod()
msg.priority = 1000
msg.match.in_port = event.port
msg.match.dl_type = 0x800
msg.match.nw_proto = 6
msg.match.tp_dst = 80
msg.actions.append(of.ofp_action_output(port=of.OFPP_CONTROLLER))
msg.data = event.ofp
self.connection.send(msg)
packet = event.parsed
if not packet.parsed:
log.info("ignoring unparsed packet")
return
client_list = switch.ports_info[event.port].clients_info
log.info("LOOP Thread id: "+str(thread.get_ident() ))
log.debug("packet.type: "+ str(packet.type) +" || pkt.ethernet.IP_TYPE: "+ str(pkt.ethernet.IP_TYPE))
if packet.type == pkt.ethernet.IP_TYPE:
ipv4_hdr = packet.payload
log.debug("ipv4_hdr.protocol: "+ str(ipv4_hdr.protocol) +" || pkt.ipv4.TCP_PROTOCOL: "+ str(pkt.ipv4.TCP_PROTOCOL))
if ipv4_hdr.protocol == pkt.ipv4.TCP_PROTOCOL:
tcp_hdr = ipv4_hdr.payload
log.info("tcp_hdr.dstport: "+ str(tcp_hdr.dstport) +" || DestPort: || 80")
if tcp_hdr.dstport == 80:
log.debug("packet.src: "+ str(packet.src))
if str(packet.src) not in client_list:
log.info("packet.src is not in client_list")
lock.acquire()
try:
log.info("save host info: IP=" + str(ipv4_hdr.srcip) + ", MAC=" + str(packet.src) + ", INGRESS_SWITCH_PORT=" + str(switch.infos.ports[event.port].name))
client_list[str(packet.src)] = host_infos(ipv4_hdr.srcip,packet.src,event.port,0)
finally:
lock.release() # release lock, no matter what
else:
log.debug("PACKET_IN INFOs: user MAC: "+ str(packet.src)+", user IP: "+ str(ipv4_hdr.srcip))
user_infos = client_list[str(packet.src)]
user_ip = user_infos.IP
log.debug("Local informations: user MAC: "+ str(packet.src)+", user IP: "+ str(user_ip))
if user_ip != ipv4_hdr.srcip:
log.debug("Updating client IP informations")
user_infos.IP = ipv4_hdr.srcip
client = client_list[str(packet.src)]
if (client.flag_auth == 0):
log.info("installing new flow to set destination IP to captive portal IP")
msg = of.ofp_flow_mod()
msg.priority = 10000
msg.idle_timeout=30
msg.match.dl_type = 0x800
msg.match.dl_src = client.MAC
msg.match.nw_proto = 6
#Adding the match on the TCP source port of the user, in order to genererate a PACKET_IN for every
#new TCP connection
msg.match.tp_src = tcp_hdr.srcport
msg.match.tp_dst = 80
msg.match.nw_dst = ipv4_hdr.dstip
msg.match.in_port = event.port
msg.actions.append(of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST,cptv.MAC))
msg.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST,cptv.IP))
msg.actions.append(of.ofp_action_tp_port(of.OFPAT_SET_TP_DST,cptv.port))
msg.actions.append(of.ofp_action_output(port=cptv.switch_port))
#msg.data = event.ofp
self.connection.send(msg)
log.info("installing new flow to set return path")
msg = of.ofp_flow_mod()
msg.priority = 10000
msg.idle_timeout=30
msg.match.dl_type = 0x800
msg.match.nw_proto = 6
msg.match.tp_dst = tcp_hdr.srcport
msg.match.nw_dst = ipv4_hdr.srcip
msg.match.nw_src = cptv.IP
msg.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC,ipv4_hdr.dstip))
msg.actions.append(of.ofp_action_tp_port(of.OFPAT_SET_TP_SRC,tcp_hdr.dstport))
msg.actions.append(of.ofp_action_output(port=event.port))
msg.data = event.ofp
self.connection.send(msg)
'''
def packet_handler(event):
global count_server
packet = event.parsed
# Only handle IPv4 flows
if (not event.parsed.find("ipv4")):
return event_cont
message = of.ofp_flow_mod()
message.match = of.ofp_match.from_packet(packet)
# Handing requests routed to the Load Balancer Ip
if (message.match.nw_dst != virtual_ip):
return event_cont
# Implemented Weighted Random Server Selection
iterator = server_no % 6
print iterator
if (IPAddr(message.match.nw_src) in clients):
iterator = clients[IPAddr(message.match.nw_src)]
serverip = topology_server[iterator]['ip']
selected_server_mac = topology_server[iterator]['mac']
server_output = topology_server[iterator]['outport']
elif (iterator < topology_server[0]['weight']):
serverip = topology_server[0]['ip']
selected_server_mac = topology_server[0]['mac']
server_output = topology_server[0]['outport']
clients[IPAddr(message.match.nw_src)] = 0
server_no += 1
elif (iterator <
(topology_server[0]['weight'] + topology_server[1]['weight'])):
serverip = topology_server[1]['ip']
selected_server_mac = topology_server[1]['mac']
server_output = topology_server[1]['outport']
clients[IPAddr(message.match.nw_src)] = 1
server_no += 1
elif (iterator <
(topology_server[0]['weight'] + topology_server[1]['weight'] +
topology_server[2]['weight'])):
serverip = topology_server[2]['ip']
selected_server_mac = topology_server[2]['mac']
server_output = topology_server[2]['outport']
clients[IPAddr(message.match.nw_src)] = 2
server_no += 1
# Route followed to server
message.buffer_id = event.ofp.buffer_id
message.in_port = event.port
message.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST, selected_server_mac))
message.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_DST,
serverip))
message.actions.append(of.ofp_action_output(port=server_output))
event.connection.send(message)
# Route from server to load balancer
reply = of.ofp_flow_mod()
reply.buffer_id = None
reply.in_port = server_output
reply.match = of.ofp_match()
reply.match.dl_src = selected_server_mac
reply.match.nw_src = serverip
reply.match.tp_src = message.match.tp_dst
reply.match.dl_dst = message.match.dl_src
reply.match.nw_dst = message.match.nw_src
reply.match.tp_dst = message.match.tp_src
reply.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, virtual_mac))
reply.actions.append(of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC,
virtual_ip))
reply.actions.append(of.ofp_action_output(port=message.in_port))
event.connection.send(reply)
return EventHalt
def genRule(self, hop, nexthop, source, destination, first=False, last=False, cookie=0x0c):
"""generate a list of openflow rules
first: hop is the first hop
last: nexthop is the last hop
returngateway: hop is a gateway on the return path
"""
#DEFAULT_HARD_TIMEOUT = of.OFP_FLOW_PERMANENT
#DEFAULT_HARD_TIMEOUT = 0
#DEFAULT_IDLE_TIMEOUT = of.OFP_FLOW_PERMANENT
DEFAULT_IDLE_TIMEOUT = 60
if not self.isSwitch(hop):
return []
orules = []
try:
if first:
orule = of.ofp_flow_mod(
command = of.OFPFC_ADD,
priority = self.priority,
idle_timeout = DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie = cookie,
match = of.ofp_match(
dl_type = 0x800,
nw_src = IPAddr(source),
nw_dst = IPAddr(destination),
#dl_dst = of.EthAddr(self.ip2mac(nexthop)),
in_port = of.OFPP_LOCAL
),
)
oactions = [of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_DST, dl_addr = self.ip2mac(nexthop)),
of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_SRC, dl_addr = self.ip2mac(hop)),
of.ofp_action_output(port = of.OFPP_ALL)]
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
elif last or self.isGateWay(hop):
localport = self.getPortInfo(self.ip2switchId(hop), of.OFPP_LOCAL)
orule = of.ofp_flow_mod(
command = of.OFPFC_ADD,
priority = self.priority,
idle_timeout = DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie = cookie,
match = of.ofp_match(
dl_type = 0x800,
nw_src = IPAddr(source),
nw_dst = IPAddr(destination),
# matching all the switch MAC addresses here would be better
),
)
oactions = []
try:
oactions.append(of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_DST, dl_addr = localport['hw_addr']))
except TypeError:
pass
oactions.append(of.ofp_action_output(port = of.OFPP_LOCAL))
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
else:
# Needed for HNAs
orule = of.ofp_flow_mod(
command = of.OFPFC_ADD,
priority = self.priority,
idle_timeout = DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie = cookie,
match = of.ofp_match(
dl_type = 0x800,
nw_src = IPAddr(source),
nw_dst = IPAddr(destination),
in_port = of.OFPP_LOCAL
),
)
oactions = []
try:
oactions.append(of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_DST, dl_addr = self.ip2mac(nexthop)))
oactions.append(of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_SRC, dl_addr = self.ip2mac(hop)))
wirelessport = self.getPortInfo(self.ip2switchId(hop), "eth0") #TODO: parametrize
if wirelessport != None and wirelessport.has_key('port_no'):
oactions.append(of.ofp_action_output(port = wirelessport['port_no']))
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
else:
self.log.warn("No wireless port info for %s?" % hop)
except Exception, e:
self.log.warn("HNA rule problem (%s -> %s): %s" % (hop, nexthop, e))
self.priority += 1
# intermediate node
orule = of.ofp_flow_mod(
command = of.OFPFC_ADD,
priority = self.priority,
idle_timeout = DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie = cookie,
match = of.ofp_match(
dl_type = 0x800,
nw_src = IPAddr(source),
nw_dst = IPAddr(destination),
dl_dst = of.EthAddr(self.ip2mac(hop))
),
)
oactions = [of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_DST, dl_addr = self.ip2mac(nexthop)),
of.ofp_action_dl_addr(type = of.OFPAT_SET_DL_SRC, dl_addr = self.ip2mac(hop)),
of.ofp_action_output(port = of.OFPP_IN_PORT)]
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
self.priority += 1
if self.priority>11000 :
self.priority=10000
def genRule(self,
hop,
nexthop,
source,
destination,
first=False,
last=False,
cookie=0x0c):
"""generate a list of openflow rules
first: hop is the first hop
last: nexthop is the last hop
returngateway: hop is a gateway on the return path
"""
#DEFAULT_HARD_TIMEOUT = of.OFP_FLOW_PERMANENT
#DEFAULT_HARD_TIMEOUT = 0
#DEFAULT_IDLE_TIMEOUT = of.OFP_FLOW_PERMANENT
DEFAULT_IDLE_TIMEOUT = 60
if not self.isSwitch(hop):
return []
orules = []
try:
if first:
orule = of.ofp_flow_mod(
command=of.OFPFC_ADD,
priority=self.priority,
idle_timeout=DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie=cookie,
match=of.ofp_match(
dl_type=0x800,
nw_src=IPAddr(source),
nw_dst=IPAddr(destination),
#dl_dst = of.EthAddr(self.ip2mac(nexthop)),
in_port=of.OFPP_LOCAL),
)
oactions = [
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_DST,
dl_addr=self.ip2mac(nexthop)),
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_SRC,
dl_addr=self.ip2mac(hop)),
of.ofp_action_output(port=of.OFPP_ALL)
]
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
elif last or self.isGateWay(hop):
localport = self.getPortInfo(self.ip2switchId(hop),
of.OFPP_LOCAL)
orule = of.ofp_flow_mod(
command=of.OFPFC_ADD,
priority=self.priority,
idle_timeout=DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie=cookie,
match=of.ofp_match(
dl_type=0x800,
nw_src=IPAddr(source),
nw_dst=IPAddr(destination),
# matching all the switch MAC addresses here would be better
),
)
oactions = []
try:
oactions.append(
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_DST,
dl_addr=localport['hw_addr']))
except TypeError:
pass
oactions.append(of.ofp_action_output(port=of.OFPP_LOCAL))
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
else:
# Needed for HNAs
orule = of.ofp_flow_mod(
command=of.OFPFC_ADD,
priority=self.priority,
idle_timeout=DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie=cookie,
match=of.ofp_match(dl_type=0x800,
nw_src=IPAddr(source),
nw_dst=IPAddr(destination),
in_port=of.OFPP_LOCAL),
)
oactions = []
try:
oactions.append(
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_DST,
dl_addr=self.ip2mac(nexthop)))
oactions.append(
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_SRC,
dl_addr=self.ip2mac(hop)))
wirelessport = self.getPortInfo(self.ip2switchId(hop),
"eth0") #TODO: parametrize
if wirelessport != None and wirelessport.has_key(
'port_no'):
oactions.append(
of.ofp_action_output(port=wirelessport['port_no']))
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
else:
self.log.warn("No wireless port info for %s?" % hop)
except Exception, e:
self.log.warn("HNA rule problem (%s -> %s): %s" %
(hop, nexthop, e))
self.priority += 1
# intermediate node
orule = of.ofp_flow_mod(
command=of.OFPFC_ADD,
priority=self.priority,
idle_timeout=DEFAULT_IDLE_TIMEOUT,
#hard_timeout = DEFAULT_HARD_TIMEOUT,
#flags= of.OFPFF_CHECK_OVERLAP,
cookie=cookie,
match=of.ofp_match(dl_type=0x800,
nw_src=IPAddr(source),
nw_dst=IPAddr(destination),
dl_dst=of.EthAddr(self.ip2mac(hop))),
)
oactions = [
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_DST,
dl_addr=self.ip2mac(nexthop)),
of.ofp_action_dl_addr(type=of.OFPAT_SET_DL_SRC,
dl_addr=self.ip2mac(hop)),
of.ofp_action_output(port=of.OFPP_IN_PORT)
]
orule.actions = oactions
orule.switchip = hop
orules.append(orule)
self.priority += 1
if self.priority > 11000:
self.priority = 10000
def _handle_PacketIn(self, event):
# parsing the input packet
packet = event.parse()
# If no switch has ever seen this host before, then it must be directly
# connected to us! Record that in our global list.
if packet.src not in self.hostlocations or self.hostlocations[
packet.src]["lastseen"] < (datetime.now() -
timedelta(0, IDLE_TIMEOUT)):
#log.debug("s%s takes ownership of host %s" % (self.connection.ID, packet.src))
self.hostlocations[packet.src] = {
"ID": self.connection.ID,
"lastseen": datetime.now()
}
# Record which hosts exists on which of our ports
ip = GetIPFromMAC(packet.src)
if ip is not None:
#log.debug(" on IP '%s'" % ip)
self.hostports[event.port] = packet.src
elif self.hostlocations[packet.src]["ID"] == self.connection.ID:
#log.debug("s%s continues to own host %s" % (datetime.now(), self.connection.ID, packet.src))
self.hostlocations[packet.src]["lastseen"] = datetime.now()
# Keep a list of which MAC addresses live on which port, so we can forward
# packets as needed
if packet.src not in self.mactable or self.mactable[
packet.src] != event.ofp.in_port:
self.mactable[packet.src] = event.ofp.in_port
#log.debug("Learned port %s connects to %s" % (event.ofp.in_port, packet.src))
if packet.type == packet.LLDP_TYPE or packet.type == 0x86DD:
# Drop LLDP packets
# Drop IPv6 packets
# send of command without actions
msg = of.ofp_packet_out()
msg.buffer_id = event.ofp.buffer_id
msg.in_port = event.port
self.connection.send(msg)
return
# Watch for ARP packets trying to discover a load-balance target.
packet_arp = packet.find('arp')
if packet_arp is not None and str(
packet_arp.protodst).startswith(LOADBALANCE_TARGET):
# Found one! Respond with a special MAC address, which our switches will
# be able to identify easily for load-balancing.
#log.debug('ARP Packet!!!! Looking for %s' % packet_arp.protodst)
mac = GetMACForLoadBalancing()
reply_arp = arp()
reply_arp.hwtype = packet_arp.hwtype
reply_arp.prototype = packet_arp.prototype
reply_arp.hwlen = packet_arp.hwlen
reply_arp.protolen = packet_arp.protolen
reply_arp.opcode = arp.REPLY
reply_arp.hwdst = packet_arp.hwsrc
reply_arp.hwsrc = mac
reply_arp.protodst = packet_arp.protosrc
reply_arp.protosrc = packet_arp.protodst
reply_eth = ethernet(type=packet.type,
src=mac,
dst=packet_arp.hwsrc)
reply_eth.payload = reply_arp
reply = of.ofp_packet_out(in_port=of.OFPP_NONE)
reply.actions.append(of.ofp_action_output(port=event.port))
reply.data = reply_eth.pack()
event.connection.send(reply)
return
# If this packet is being delivered to a special MAC, set up some flows to
# get the data to the right place.
packet_ipv4 = packet.find('ipv4')
if IsMACForLoadBalancing(packet.dst) and packet_ipv4 is not None:
eligibleports = []
for port in self.connection.features.ports:
if port.port_no != event.port and not port.config & OFPPC_PORT_DOWN:
eligibleports.append(port.port_no)
port_out = random.choice(eligibleports)
# Establish bi-directional flows!
log.debug("Establishing load-balancing flows for %s <--> %s" %
(packet.src, packet.dst))
flow_in = of.ofp_flow_mod()
flow_out = of.ofp_flow_mod()
flow_in.idle_timeout = flow_out.idle_timeout = IDLE_TIMEOUT
flow_in.hard_timeout = flow_out.hard_timeout = HARD_TIMEOUT
flow_in.match = of.ofp_match(dl_dst=packet.src, dl_src=packet.dst)
flow_out.match = of.ofp_match(dl_dst=packet.dst, dl_src=packet.src)
if port_out in self.hostports:
# If we're delivering to a host (instead of another switch), we need
# to rewrite some of the packet data, so that things line up properly
# on each end. The sender sends to the special IP, and the receiver
# should see the packet addressed to itself (and vice versa).
log.debug("...which will be handled by %s" %
(self.hostports[port_out]))
flow_in.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_SRC, packet.dst))
flow_in.actions.append(
of.ofp_action_nw_addr(of.OFPAT_SET_NW_SRC,
packet_ipv4.dstip))
flow_out.actions.append(
of.ofp_action_dl_addr(of.OFPAT_SET_DL_DST,
self.hostports[port_out]))
flow_out.actions.append(
of.ofp_action_nw_addr(
of.OFPAT_SET_NW_DST,
GetIPFromMAC(self.hostports[port_out])))
# We also need to update one of our match rules, since the packet will
# be sent with a non-special MAC address.
flow_in.match.dl_src = self.hostports[port_out]
flow_in.actions.append(of.ofp_action_output(port=event.port))
flow_out.actions.append(of.ofp_action_output(port=port_out))
flow_in.in_port = port_out
flow_out.in_port = event.port
flow_out.data = event.ofp
self.connection.send(flow_in)
self.connection.send(flow_out)
return
elif packet.dst in self.mactable:
# If we know the destination, but are being told about it, recreate the
# flow, since this is either the initial discovery, or the flow expired.
log.debug(
"Establishing flow to deliver packets for %s to port %s" %
(packet.dst, self.mactable[packet.dst]))
fm = of.ofp_flow_mod()
fm.idle_timeout = IDLE_TIMEOUT
fm.hard_timeout = HARD_TIMEOUT
fm.actions.append(
of.ofp_action_output(port=self.mactable[packet.dst]))
# Defining the match via from_packet will cause us to establish a flow
# for each unique packet type per destination, instead of just per dest.
fm.match = of.ofp_match(dl_dst=packet.dst, dl_src=packet.src)
#fm.match = of.ofp_match.from_packet(packet)
fm.data = event.ofp # Deliver the packet along this flow
self.connection.send(fm)
return
log.debug("Port for %s unknown -- flooding" % (packet.dst, ))
msg = of.ofp_packet_out()
msg.actions.append(of.ofp_action_output(port=of.OFPP_FLOOD))
msg.buffer_id = event.ofp.buffer_id
msg.in_port = event.port
self.connection.send(msg)
