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TcpSyn_comment.py
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TcpSyn_comment.py
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# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Original file is simple_switch_13.py
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.ofproto import inet
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types
from ryu.lib.packet import ipv4
from ryu.lib.packet import tcp
# Connect from SERVER1
class TCPSYN13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(TCPSYN13, self).__init__(*args, **kwargs)
self.mac_to_port = {}
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
#Send packet to CONTROLLER
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
#TableID:0 INGRESS_FILTERING
match_t1 = parser.OFPMatch(eth_type=0x0800,
ip_proto=6)
inst = [parser.OFPInstructionGotoTable(1)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=0, priority=2,
match=match_t1, instructions=inst))
match = parser.OFPMatch()
"""
inst = [parser.OFPInstructionGotoTable(4)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=0, priority=1,
match=match, instructions=inst))
"""
#TableID:1 CHECKED_TCP
inst = [parser.OFPInstructionGotoTable(2)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=1, priority=1,
match=match, instructions=inst))
#TableID:2 CHECKING_TCP
inst = [parser.OFPInstructionGotoTable(3)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=2, priority=1,
match=match, instructions=inst))
#TableID:3 UNCHECK_TCP
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=3, priority=1,
match=match, instructions=inst))
"""
#TableID:4 FORWARDING 2 => 1
actions = [parser.OFPActionOutput(port=1)]
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=4, priority=1,
match=match, instructions=inst))
"""
@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
# パケットが入ってきたスイッチの物理ポート
port = msg.match['in_port']
pkt = packet.Packet(data=msg.data)
# イーサネットを持つかどうか
pkt_ethernet = pkt.get_protocol(ethernet.ethernet)
if not pkt_ethernet:
return
# IPプロトコルを持つかどうか
pkt_ipv4 = pkt.get_protocol(ipv4.ipv4)
if not pkt_ipv4 :
return
pkt_tcp = pkt.get_protocol(tcp.tcp)
# TCPプロトコルを持つかどうか
if not pkt_tcp:
return
# TCPコントロールフラグのSYNフラグが立っているか
if pkt_tcp.has_flags(tcp.TCP_SYN):
# 認証中ホストとしてテーブルに記録
# Flowmod(パケットの送信元Eth,IP,Port,送信先Eth,IP,PortをMatchとして,OpenFlowスイッチのテーブルにエントリ追加)
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,ofproto.OFPCML_NO_BUFFER)]
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
match = parser.OFPMatch(eth_type=0x0800, ip_proto=6,
eth_dst=pkt_ethernet.dst,eth_src=pkt_ethernet.src,
ipv4_dst=pkt_ipv4.dst,ipv4_src=pkt_ipv4.src,
tcp_dst=pkt_tcp.dst_port,tcp_src=pkt_tcp.src_port)
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=2,idle_timeout=3,priority=10,
match=match, instructions=inst))
# 不正なSYN/ACKパケットの生成処理
pkt_in = packet.Packet()
pkt_in.add_protocol(ethernet.ethernet(dst=pkt_ethernet.src, src=pkt_ethernet.dst))
pkt_in.add_protocol(ipv4.ipv4(dst=pkt_ipv4.src,src=pkt_ipv4.dst,proto=inet.IPPROTO_TCP))
pkt_in.add_protocol(tcp.tcp(src_port=pkt_tcp.dst_port,dst_port=pkt_tcp.src_port,bits=(tcp.TCP_SYN | tcp.TCP_ACK),ack=1234,seq=56789))
pkt_in.serialize()
data = pkt_in.data
actions = [parser.OFPActionOutput(port=port)]
# PacketOut
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions,
data=data)
datapath.send_msg(out)
# TCPコントロールフラグのRSTフラグが立っているか
elif pkt_tcp.has_flags(tcp.TCP_RST):
# 認証済みホストとしてテーブルに記録
# Flowmod(パケットの送信元Eth,IP,Port,送信先Eth,IP,PortをMatchとして,OpenFlowスイッチのテーブルにエントリ追加)
actions = [parser.OFPActionOutput(port=2)]
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
match = parser.OFPMatch(eth_type=0x0800, ip_proto=6,
eth_dst=pkt_ethernet.dst,eth_src=pkt_ethernet.src,
ipv4_dst=pkt_ipv4.dst,ipv4_src=pkt_ipv4.src,
tcp_dst=pkt_tcp.dst_port,tcp_src=pkt_tcp.src_port)
datapath.send_msg(datapath.ofproto_parser.OFPFlowMod(datapath=datapath, table_id=1, priority=10,
match=match, instructions=inst))