class SecureFirewall(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
inner_policy = {}
icmp_conn_track = {}
tcp_conn_track = {}
udp_conn_track = {}
sendpkt = SendPacket()
flow = Construct()
track = TrackConnection()
def __init__(self, *args, **kwargs):
super(SecureFirewall, self).__init__(*args, **kwargs)
self.mac_to_port = {}
parser = parse_firewall()
self.inner_policy = parser.parse()
self.logger.info("dict is ready")
@set_ev_cls(dpset.EventDP, dpset.DPSET_EV_DISPATCHER)
def handler_datapath(self, ev):
SwitchInfo(ev)
"""
Handles incoming packets. Decode them
and check for suitable Firewall Rules.
"""
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
try:
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
ethtype = eth.ethertype
out_port = self.port_learn(datapath, eth, in_port)
action_fwd_to_out_port = [parser.OFPActionOutput(out_port)]
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
action_fwd_to_in_port = [parser.OFPActionOutput(in_port)]
actions_default = action_fwd_to_out_port
if (out_port != ofproto.OFPP_FLOOD) and (ethtype == ETH_TYPE_IP):
ipo = pkt.get_protocols(ipv4.ipv4)[0]
#Check for ICMP
if (ipo.proto == IPPROTO_ICMP):
icmpob = pkt.get_protocol(icmp.icmp)
flag1 = 0
#Check if this is PING or PONG
if ((icmpob.type == ICMP_PING)
and self.inner_policy.has_key(ipo.src)):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'ICMP')
and (xyz[5] == 'ALLOW')):
flag1 = 1
actions_default = action_fwd_to_out_port
self.icmp_conn_track = self.track.conn_track_dict(
self.icmp_conn_track, ipo.src, ipo.dst,
"PING", "PONG", xyz[5], 2)
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=ICMP_PING,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst)
self.flow.add_flow(
datapath=datapath,
actions=action_fwd_to_in_port,
priority=1000,
in_port=out_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=ICMP_PONG,
ipv4_src=ipo.dst,
ipv4_dst=ipo.src)
break
if (flag1 == 0):
actions_default = action_drop
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=icmpob.type,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst)
#Check for TCP.
elif (ipo.proto == IPPROTO_TCP):
tcpo = pkt.get_protocol(tcp.tcp)
flag2 = 0
# TCP SYN packet
if (((tcpo.bits & TCP_SYN) == TCP_SYN) &
((tcpo.bits & TCP_BOGUS_FLAGS) == 0x00)):
if self.inner_policy.has_key(ipo.src):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if ((temp[i][0] == ipo.dst)
and (temp[i][1] == 'TCP')
and (int(temp[i][2]) == tcpo.src_port)
and (int(temp[i][3]) == tcpo.dst_port)
and (temp[i][5] == 'ALLOW')):
flag2 = 1
actions_default = action_fwd_to_out_port
self.tcp_conn_track = self.track.conn_track_dict(
self.tcp_conn_track, ipo.src, ipo.dst,
tcpo.src_port, tcpo.dst_port, tcpo.seq,
1)
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_TCP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
tcp_src=tcpo.src_port,
tcp_dst=tcpo.dst_port)
break
# TCP SYN ACK packet
elif ((tcpo.bits & TCP_SYN_ACK) == TCP_SYN_ACK):
if self.tcp_conn_track.has_key(ipo.dst):
temp2 = self.tcp_conn_track.get(ipo.dst)
for i in range(0, len(temp2)):
if ((temp2[i][0] == ipo.src)
and (int(temp2[i][1]) == tcpo.dst_port)
and
(int(temp2[i][2]) == tcpo.src_port)):
flag2 = 1
actions_default = action_fwd_to_out_port
self.tcp_conn_track = self.track.conn_track_dict(
self.tcp_conn_track, ipo.src, ipo.dst,
tcpo.src_port, tcpo.dst_port, tcpo.seq,
1)
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_TCP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
tcp_src=tcpo.src_port,
tcp_dst=tcpo.dst_port)
break
# All remaining TCP packets, like, ACK, PUSH, FIN etc.
else:
if self.tcp_conn_track.has_key(ipo.src):
temp3 = self.tcp_conn_track.get(ipo.src)
for i in range(0, len(temp3)):
if ((temp3[i][0] == ipo.dst)
and (int(temp3[i][1]) == tcpo.src_port)
and
(int(temp3[i][2]) == tcpo.dst_port)):
flag2 = 1
actions_default = action_fwd_to_out_port
break
if (flag2 == 0):
actions_default = action_drop
#Check for UDP
elif (ipo.proto == IPPROTO_UDP):
udpo = pkt.get_protocol(udp.udp)
flag3 = 0
if self.inner_policy.has_key(ipo.src):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'UDP')
and (int(xyz[2]) == udpo.src_port)
and (int(xyz[3]) == udpo.dst_port)
and (xyz[5] == 'ALLOW')):
flag3 = 1
actions_default = action_fwd_to_out_port
self.udp_conn_track = self.track.conn_track_dict(
self.udp_conn_track, ipo.src, ipo.dst,
udpo.src_port, udpo.dst_port, xyz[5],
2)
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_UDP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
udp_src=udpo.src_port,
udp_dst=udpo.dst_port)
self.flow.add_flow(
datapath=datapath,
actions=action_fwd_to_in_port,
priority=1000,
in_port=out_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_UDP,
ipv4_src=ipo.dst,
ipv4_dst=ipo.src,
udp_src=udpo.dst_port,
udp_dst=udpo.src_port)
break
if (flag3 == 0):
actions_default = action_drop
else:
self.logger.info("Wrong IP protocol found")
actions_default = action_drop
# Handling ARP Rules.
elif (ethtype == ETH_TYPE_ARP):
self.arp_handling(datapath, out_port, eth, in_port)
actions_default = action_fwd_to_out_port
else:
actions_default = action_drop
except Exception as err:
self.logger.info("ERROR: %s", err.message)
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
actions_default = action_drop
finally:
self.sendpkt.send(datapath, msg, in_port, actions_default)
"""
Add ARP rules on flow tables
"""
def arp_handling(self, datapath, out_port, eth_obj, in_port):
if (out_port != datapath.ofproto.OFPP_FLOOD):
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.flow.add_flow(datapath=datapath,
actions=actions,
priority=1000,
in_port=in_port,
eth_type=ETH_TYPE_ARP,
eth_src=eth_obj.src,
eth_dst=eth_obj.dst)
"""
Learn Switch port associated with a MAC address here
"""
def port_learn(self, datapath, eth_obj, in_port):
try:
self.mac_to_port.setdefault(datapath.id, {
'90:e2:ba:1c:55:54': 1,
'90:e2:ba:1c:55:55': 2
})
self.mac_to_port[datapath.id][eth_obj.src] = in_port
if (eth_obj.ethertype == ETH_TYPE_IP) or (eth_obj.ethertype
== ETH_TYPE_ARP):
if eth_obj.dst in self.mac_to_port[datapath.id]:
out_port = self.mac_to_port[datapath.id][eth_obj.dst]
else:
out_port = datapath.ofproto.OFPP_FLOOD
except Exception as err:
self.info(err.message)
out_port = datapath.ofproto.OFPP_FLOOD
finally:
return out_port
class SecureFirewall(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
inner_policy = {}
sendpkt = SendPacket()
flow = Construct()
current_time = Incoming_packet_time()
def __init__(self, *args, **kwargs):
super(SecureFirewall, self).__init__(*args, **kwargs)
self.mac_to_port = {}
parser = parse_firewall()
self.inner_policy = parser.parse()
self.logger.info("dict is ready")
@set_ev_cls(dpset.EventDP, dpset.DPSET_EV_DISPATCHER)
def handler_datapath(self, ev):
SwitchInfo(ev)
"""
Handles incoming packets. Decode them
and check for suitable Firewall Rules.
"""
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
try:
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
ethtype = eth.ethertype
out_port = self.port_learn(datapath, eth, in_port)
action_fwd_to_out_port = [parser.OFPActionOutput(out_port)]
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
actions_default = action_fwd_to_out_port
if (out_port != ofproto.OFPP_FLOOD) and (ethtype == ETH_TYPE_IP):
ipo = pkt.get_protocols(ipv4.ipv4)[0]
# Check for ICMP
if (ipo.proto == IPPROTO_ICMP):
flag1 = 0
icmpob = pkt.get_protocol(icmp.icmp)
# Check if this is PING
if ((icmpob.type == ICMP_PING)
and self.inner_policy.has_key(ipo.src)):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'ICMP') and (xyz[4] == 'PING')
and (xyz[5] == 'ALLOW')):
flag1 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : PING PACKET ALLOWED" %
(ipo.src, ipo.dst))
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=ICMP_PING,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst)
break
# Check if it is PONG
elif ((icmpob.type == ICMP_PONG)
and (self.inner_policy.has_key(ipo.src))):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'ICMP') and (xyz[4] == 'PONG')
and (xyz[5] == 'ALLOW')):
flag1 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : PONG PACKET ALLOWED" %
(ipo.src, ipo.dst))
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=ICMP_PONG,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst)
self.current_time.time()
self.logger.info("\n")
break
# What if no match found ?
if (flag1 == 0):
actions_default = action_drop
self.logger.info("%s -> %s : ICMP BLOCKED" %
(ipo.src, ipo.dst))
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_ICMP,
icmpv4_type=icmpob.type,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst)
# Check for TCP
elif (ipo.proto == IPPROTO_TCP):
tcpo = pkt.get_protocol(tcp.tcp)
flag2 = 0
# TCP packet and Firewall rule
if self.inner_policy.has_key(ipo.src):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if ((temp[i][0] == ipo.dst)
and (temp[i][1] == 'TCP')
and (int(temp[i][2]) == tcpo.src_port)
and (int(temp[i][3]) == tcpo.dst_port)
and (temp[i][4].upper() == 'ANY')
and (temp[i][5] == 'ALLOW')):
flag2 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : TCP PACKET ALLOWED" %
(ipo.src, ipo.dst))
self.current_time.time()
self.logger.info("\n")
break
elif (((tcpo.bits & TCP_ACK) == TCP_ACK)
and (temp[i][0] == ipo.dst)
and (temp[i][1] == 'TCP')
and (int(temp[i][2]) == tcpo.src_port)
and (int(temp[i][3]) == tcpo.dst_port)
and (temp[i][4].upper() == 'ACK')
and (temp[i][5] == 'ALLOW')):
flag2 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : TCP PACKET ALLOWED" %
(ipo.src, ipo.dst))
self.current_time.time()
self.logger.info("\n")
break
# If match found then add Flow Table rules
if (flag2 != 0):
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_TCP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
tcp_src=tcpo.src_port,
tcp_dst=tcpo.dst_port)
# What if no match found ?
else:
actions_default = action_drop
self.logger.info("%s -> %s : BLOCKED" %
(ipo.src, ipo.dst))
# Check for UDP
elif (ipo.proto == IPPROTO_UDP):
udpo = pkt.get_protocol(udp.udp)
flag3 = 0
if self.inner_policy.has_key(ipo.src):
temp3 = self.inner_policy.get(ipo.src)
for i in range(0, len(temp3)):
if temp3[i][0] == ipo.dst:
xyz = temp3[i]
if ((xyz[1] == 'UDP')
and (int(xyz[2]) == udpo.src_port)
and (int(xyz[3]) == udpo.dst_port)
and (xyz[5] == 'ALLOW')):
flag3 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s: UDP ALLOWED" %
(ipo.src, ipo.dst))
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_UDP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
udp_src=udpo.src_port,
udp_dst=udpo.dst_port)
self.current_time.time()
self.logger.info("\n")
break
# What if no match found ?
if (flag3 == 0):
actions_default = action_drop
self.logger.info("%s -> %s : BLOCKED" %
(ipo.src, ipo.dst))
self.flow.add_flow(datapath=datapath,
actions=actions_default,
priority=1001,
in_port=in_port,
eth_type=ETH_TYPE_IP,
ip_proto=IPPROTO_UDP,
ipv4_src=ipo.src,
ipv4_dst=ipo.dst,
udp_src=udpo.src_port,
udp_dst=udpo.dst_port)
# If not ICMP, TCP or UDP then drop..!
else:
self.logger.info("Wrong IP protocol found")
actions_default = action_drop
# Handling ARP Rules.
elif (ethtype == ETH_TYPE_ARP):
self.arp_handling(datapath, out_port, eth, in_port)
actions_default = action_fwd_to_out_port
# If packet is not IP or ARP then drop..!
else:
actions_default = action_drop
except Exception as err:
self.logger.info("MYERROR: %s", err.message)
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
actions_default = action_drop
finally:
self.sendpkt.send(datapath, msg, in_port, actions_default)
"""
Add ARP rules on Flow Tables
"""
def arp_handling(self, datapath, out_port, eth_obj, in_port):
if (out_port != datapath.ofproto.OFPP_FLOOD):
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.flow.add_flow(datapath=datapath,
actions=actions,
priority=1000,
in_port=in_port,
eth_type=ETH_TYPE_ARP,
eth_src=eth_obj.src,
eth_dst=eth_obj.dst)
"""
Learn Switch port associated with a MAC address here
"""
def port_learn(self, datapath, eth_obj, in_port):
try:
self.mac_to_port.setdefault(datapath.id, {
'90:e2:ba:1c:55:54': 1,
'90:e2:ba:1c:55:55': 2
})
self.mac_to_port[datapath.id][eth_obj.src] = in_port
if (eth_obj.ethertype == ETH_TYPE_IP) or (eth_obj.ethertype
== ETH_TYPE_ARP):
if eth_obj.dst in self.mac_to_port[datapath.id]:
out_port = self.mac_to_port[datapath.id][eth_obj.dst]
else:
out_port = datapath.ofproto.OFPP_FLOOD
except Exception as err:
self.info(err.message)
out_port = datapath.ofproto.OFPP_FLOOD
finally:
return out_port
class InefficientFirewall(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
inner_policy = {}
icmp_conn_track = {}
tcp_conn_track = {}
udp_conn_track = {}
sendpkt = SendPacket()
flow = Construct()
track = TrackConnection()
current_time = Incoming_packet_time()
def __init__(self, *args, **kwargs):
super(InefficientFirewall, self).__init__(*args, **kwargs)
self.mac_to_port = {}
parser = parse_firewall()
self.inner_policy = parser.parse()
@set_ev_cls(dpset.EventDP, dpset.DPSET_EV_DISPATCHER)
def handler_datapath(self, ev):
SwitchInfo(ev)
"""
Handles incoming packets. Decodes them
and checks for suitable Firewall rules.
"""
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
try:
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
ethtype = eth.ethertype
out_port = self.port_learn(datapath, eth, in_port)
action_fwd_to_out_port = [parser.OFPActionOutput(out_port)]
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
actions_default = action_fwd_to_out_port
if (out_port != ofproto.OFPP_FLOOD) and (ethtype == ETH_TYPE_IP):
ipo = pkt.get_protocols(ipv4.ipv4)[0]
# Check for ICMP
if (ipo.proto == IPPROTO_ICMP):
flag1 = 0
icmpob = pkt.get_protocol(icmp.icmp)
# Check if this is PING
if ((icmpob.type == ICMP_PING)
and self.inner_policy.has_key(ipo.src)):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'ICMP')
and (xyz[5] == 'ALLOW')):
flag1 = 1
actions_default = action_fwd_to_out_port
self.icmp_conn_track = self.track.conn_track_dict(
self.icmp_conn_track, ipo.src, ipo.dst,
"PING", "PONG", xyz[5], 2)
self.logger.info(
"%s -> %s : ECHO REQUEST ALLOWED" %
(ipo.src, ipo.dst))
break
# Otherwise, PONG...!
elif ((icmpob.type == ICMP_PONG)
and (self.icmp_conn_track.has_key(ipo.src))):
temp2 = self.icmp_conn_track.get(ipo.src)
for i in range(0, len(temp2)):
if temp2[i][0] == ipo.dst:
xyz = temp2[i]
if ((xyz[1] == 'PONG')
and (xyz[3] == 'ALLOW')):
flag1 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : ECHO REPLY ALLOWED" %
(ipo.src, ipo.dst))
self.logger.info(
"\n%s -> %s action= %s state= ESTABLISHED \n"
% (xyz[0], ipo.src, xyz[2]))
self.current_time.time()
self.logger.info("\n")
break
# What about no match ??
if (flag1 == 0):
actions_default = action_drop
self.logger.info("%s -> %s : BLOCKED" %
(ipo.src, ipo.dst))
# Check for TCP
elif (ipo.proto == IPPROTO_TCP):
tcpo = pkt.get_protocol(tcp.tcp)
flag2 = 0
# TCP SYN packet
if (((tcpo.bits & TCP_SYN) == TCP_SYN) &
((tcpo.bits & TCP_BOGUS_FLAGS) == 0x00)):
if self.inner_policy.has_key(ipo.src):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if ((temp[i][0] == ipo.dst)
and (temp[i][1] == 'TCP')
and (int(temp[i][2]) == tcpo.src_port)
and (int(temp[i][3]) == tcpo.dst_port)
and (temp[i][5] == 'ALLOW')):
flag2 = 1
actions_default = action_fwd_to_out_port
self.tcp_conn_track = self.track.conn_track_dict(
self.tcp_conn_track, ipo.src, ipo.dst,
tcpo.src_port, tcpo.dst_port, tcpo.seq,
1)
self.logger.info(
"%s -> %s : SYN ALLOWED" %
(ipo.src, ipo.dst))
break
# TCP SYN ACK packet
elif ((tcpo.bits & TCP_SYN_ACK) == TCP_SYN_ACK):
if self.tcp_conn_track.has_key(ipo.dst):
temp2 = self.tcp_conn_track.get(ipo.dst)
for i in range(0, len(temp2)):
if ((temp2[i][0] == ipo.src)
and (int(temp2[i][1]) == tcpo.dst_port)
and
(int(temp2[i][2]) == tcpo.src_port)):
flag2 = 1
actions_default = action_fwd_to_out_port
self.tcp_conn_track = self.track.conn_track_dict(
self.tcp_conn_track, ipo.src, ipo.dst,
tcpo.src_port, tcpo.dst_port, tcpo.seq,
1)
self.logger.info(
"%s -> %s : SYN ACK ALLOWED" %
(ipo.src, ipo.dst))
self.logger.info(
"\n%s -> %s src_port= %s dst_port= %s state= ESTABLISHED \n"
% (ipo.dst, ipo.src, temp2[i][1],
temp2[i][2]))
self.current_time.time()
self.logger.info("\n")
break
# All remaining TCP packets, like, ACK, PUSH, FIN etc.
else:
if self.tcp_conn_track.has_key(ipo.src):
temp3 = self.tcp_conn_track.get(ipo.src)
for i in range(0, len(temp3)):
if ((temp3[i][0] == ipo.dst)
and (int(temp3[i][1]) == tcpo.src_port)
and
(int(temp3[i][2]) == tcpo.dst_port)):
flag2 = 1
actions_default = action_fwd_to_out_port
self.logger.info(
"%s -> %s : TRANSMISSION ALLOWED" %
(ipo.src, ipo.dst))
break
# What if no match found ?
if (flag2 == 0):
actions_default = action_drop
self.logger.info("%s -> %s : SYN BLOCKED" %
(ipo.src, ipo.dst))
# Check for UDP
elif (ipo.proto == IPPROTO_UDP):
flag3 = 0
udpo = pkt.get_protocol(udp.udp)
# Check for tracked UDP
if self.udp_conn_track.has_key(ipo.dst):
tmp_tpl = self.udp_conn_track.get(ipo.dst)
tmp = list(tmp_tpl)
for i in range(0, len(tmp)):
if (tmp[i][0] == ipo.src):
xyz = tmp[i]
if ((int(xyz[1]) == udpo.dst_port)
and (int(xyz[2]) == udpo.src_port)
and (xyz[3] == 'UNREPLIED')):
flag3 = 1
self.logger.info(
"%s -> %s : UDP PACKET ALLOWED" %
(ipo.src, ipo.dst))
actions_default = action_fwd_to_out_port
del tmp[
i] ### We need to remove this state entry to keep this packet 'REPLIED'
self.logger.info(
"\n%s -> %s src_port= %s dst_port= %s state= ASSURED\n"
% (ipo.src, ipo.dst, udpo.src_port,
udpo.dst_port))
break
tmp_tpl = tuple(tmp)
if len(tmp_tpl) != 0:
self.udp_conn_track[ipo.dst] = tmp_tpl
else:
self.udp_conn_track.pop(ipo.dst, None)
# Check for first UDP packet
elif self.inner_policy.has_key(ipo.src):
temp = self.inner_policy.get(ipo.src)
for i in range(0, len(temp)):
if temp[i][0] == ipo.dst:
xyz = temp[i]
if ((xyz[1] == 'UDP')
and (int(xyz[2]) == udpo.src_port)
and (int(xyz[3]) == udpo.dst_port)
and (xyz[5] == 'ALLOW')):
flag3 = 1
actions_default = action_fwd_to_out_port
self.udp_conn_track = self.track.conn_track_dict(
self.udp_conn_track, ipo.src, ipo.dst,
udpo.src_port, udpo.dst_port,
"UNREPLIED", 1)
self.logger.info(
"%s -> %s : UDP PACKET ALLOWED" %
(ipo.src, ipo.dst))
self.logger.info(
"\n%s -> %s src_port= %s dst_port= %s state= UNREPLIED\n"
% (ipo.src, ipo.dst, udpo.src_port,
udpo.dst_port))
self.current_time.time()
self.logger.info("\n")
break
# what if no match found ?
if (flag3 == 0):
actions_default = action_drop
self.logger.info("%s -> %s : UDP BLOCKED" %
(ipo.src, ipo.dst))
# If not ICMP, TCP or UDP then drop..!
else:
self.logger.info("Wrong IP protocol found")
actions_default = action_drop
# Handling ARP Rules.
elif (ethtype == ETH_TYPE_ARP):
self.arp_handling(datapath, out_port, eth, in_port)
actions_default = action_fwd_to_out_port
# If packet is not IP or ARP then drop..!
else:
actions_default = action_drop
except Exception as err:
self.logger.info("MYERROR: %s", err.message)
action_drop = [parser.OFPActionOutput(ofproto.OFPPC_NO_FWD)]
actions_default = action_drop
finally:
self.sendpkt.send(datapath, msg, in_port, actions_default)
"""
Add ARP rules on Flow Tables
"""
def arp_handling(self, datapath, out_port, eth_obj, in_port):
if (out_port != datapath.ofproto.OFPP_FLOOD):
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.flow.add_flow(datapath=datapath,
actions=actions,
priority=1000,
in_port=in_port,
eth_type=ETH_TYPE_ARP,
eth_src=eth_obj.src,
eth_dst=eth_obj.dst)
"""
Learn Switch port associated with a MAC address here
"""
def port_learn(self, datapath, eth_obj, in_port):
try:
self.mac_to_port.setdefault(datapath.id, {})
self.mac_to_port[datapath.id][eth_obj.src] = in_port
if (eth_obj.ethertype == ETH_TYPE_IP) or (eth_obj.ethertype
== ETH_TYPE_ARP):
if eth_obj.dst in self.mac_to_port[datapath.id]:
out_port = self.mac_to_port[datapath.id][eth_obj.dst]
else:
out_port = datapath.ofproto.OFPP_FLOOD
except Exception as err:
self.info(err.message)
out_port = datapath.ofproto.OFPP_FLOOD
finally:
return out_port