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reactive_tcp.py
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# Faculty of Engineering, University of Victoria, Canada, 2018
# Author: Maryam Tanha
# This code reuses a part of the code available at https://github.com/osrg/ryu/pull/55/commits/aa401aac6c21c263d7df234071ba2ba82301834f and change it to make it suitable to be used in a wireless mesh network. Actually due to MAC rewriting in each hop, we need to add the SetField actions to the flow entries of the flow tables.
#This is free a software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# It is distributed in the hope that it will be helpful, but WITHOUT ANY WARRANTY;
# GNU General Public License for more details.
import logging
import struct
from operator import attrgetter
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER, DEAD_DISPATCHER
from ryu.controller.handler import CONFIG_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ipv4
from ryu.lib.packet import arp
from ryu.topology import event, switches
from ryu.topology.api import get_switch, get_link
from ryu.controller import dpset
import copy
from ryu.controller.handler import set_ev_cls
import network_aware
import networkx as nx
from threading import Lock
from ryu.controller import handler
class Reactive_Recovery(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
_CONTEXTS = {
"Network_Aware": network_aware.Network_Aware,
}
def __init__(self, *args, **kwargs):
super(Reactive_Recovery, self).__init__(*args, **kwargs)
self.network_aware = kwargs["Network_Aware"]
self.mac_to_port = {}
self.datapaths = {}
self.dpid_port_mac = {}
self.hosts = []
# links :(src_dpid,dst_dpid)->(src_port,dst_port)
self.link_to_port = self.network_aware.link_to_port
# {sw :[host1_ip,host2_ip,host3_ip,host4_ip]}
self.access_table = self.network_aware.access_table
# dpid->port_num (ports without link)
self.access_ports = self.network_aware.access_ports
self.graph = self.network_aware.graph
self.G = self.network_aware.G
self.flows = []
#self.lock = Lock()
self.failed_link = None
@set_ev_cls(ofp_event.EventOFPStateChange,
[MAIN_DISPATCHER, DEAD_DISPATCHER])
def _state_change_handler(self, ev):
datapath = ev.datapath
if ev.state == MAIN_DISPATCHER:
if not datapath.id in self.datapaths:
self.logger.debug('register datapath: %016x', datapath.id)
self.datapaths[datapath.id] = datapath
elif ev.state == DEAD_DISPATCHER:
if datapath.id in self.datapaths:
self.logger.debug('unregister datapath: %016x', datapath.id)
del self.datapaths[datapath.id]
def add_flow(self, dp, p, match, actions, idle_timeout=0, hard_timeout=0):
ofproto = dp.ofproto
parser = dp.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
mod = parser.OFPFlowMod(datapath=dp, priority=p,
idle_timeout=idle_timeout,
hard_timeout=hard_timeout,
match=match, instructions=inst)
dp.send_msg(mod)
def install_flow_reactive(self, paths, flow_info):
'''
path=[dpid1, dpid2, dpid3...]
flow_info=(eth_type, src_ip, dst_ip, in_port)
'''
path = paths[0]
# first flow entry
in_port = flow_info[3]
assert path
datapath_first = self.datapaths[path[0]]
ofproto = datapath_first.ofproto
parser = datapath_first.ofproto_parser
out_port = ofproto.OFPP_LOCAL
# inter_link
if len(path) > 2:
for i in xrange(1, len(path) - 1):
port = self.get_link2port(path[i - 1], path[i])
port_next = self.get_link2port(path[i], path[i + 1])
if port:
src_port, dst_port = port[1], port_next[0]
datapath = self.datapaths[path[i]]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
actions = []
actions.append(parser.OFPActionSetField(eth_src=self.get_port_mac(path[i], port_next[0])))
actions.append(parser.OFPActionSetField(eth_dst=self.get_port_mac(path[i+1], port_next[1])))
actions.append(parser.OFPActionOutput(dst_port))
match = parser.OFPMatch(
in_port=src_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(
datapath, 1, match, actions,
idle_timeout=10, hard_timeout=30)
if len(path) > 1:
# the first flow entry
port_pair = self.get_link2port(path[0], path[1])
out_port = port_pair[0]
parser = datapath_first.ofproto_parser
ofproto = datapath_first.ofproto
actions = []
actions.append(parser.OFPActionSetField(eth_src=self.get_port_mac(path[0], port_pair[0])))
actions.append(parser.OFPActionSetField(eth_dst=self.get_port_mac(path[1], port_pair[1])))
actions.append(parser.OFPActionOutput(out_port))
match = parser.OFPMatch(
in_port=in_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(datapath_first,
1, match, actions, idle_timeout=10, hard_timeout=30)
# the last hop: tor -> host
datapath = self.datapaths[path[-1]]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
actions = []
src_port = self.get_link2port(path[-2], path[-1])[1]
dst_port = None
for key in self.access_table.keys():
if flow_info[2] == self.access_table[key]:
dst_port = key[1]
break
actions.append(parser.OFPActionSetField(eth_src=flow_info[4]))
actions.append(parser.OFPActionSetField(eth_dst=flow_info[5]))
actions.append(parser.OFPActionOutput(dst_port))
match = parser.OFPMatch(
in_port=src_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(
datapath, 1, match, actions, idle_timeout=10, hard_timeout=30)
def install_flow(self, paths, flow_info, buffer_id, data):
'''
path=[dpid1, dpid2, dpid3...]
flow_info=(eth_type, src_ip, dst_ip, in_port)
'''
path = paths[0]
# first flow entry
in_port = flow_info[3]
assert path
datapath_first = self.datapaths[path[0]]
ofproto = datapath_first.ofproto
parser = datapath_first.ofproto_parser
out_port = ofproto.OFPP_LOCAL
# inter_link
if len(path) > 2:
for i in xrange(1, len(path) - 1):
port = self.get_link2port(path[i - 1], path[i])
port_next = self.get_link2port(path[i], path[i + 1])
if port:
src_port, dst_port = port[1], port_next[0]
datapath = self.datapaths[path[i]]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
actions = []
actions.append(parser.OFPActionSetField(eth_src=self.get_port_mac(path[i], port_next[0])))
actions.append(parser.OFPActionSetField(eth_dst=self.get_port_mac(path[i+1], port_next[1])))
actions.append(parser.OFPActionOutput(dst_port))
match = parser.OFPMatch(
in_port=src_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(
datapath, 1, match, actions,
idle_timeout=10, hard_timeout=30)
# inter links pkt_out
msg_data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
msg_data = data
out = parser.OFPPacketOut(
datapath=datapath, buffer_id=buffer_id,
data=msg_data, in_port=src_port, actions=actions)
datapath.send_msg(out)
if len(path) > 1:
# the first flow entry
port_pair = self.get_link2port(path[0], path[1])
out_port = port_pair[0]
parser = datapath_first.ofproto_parser
ofproto = datapath_first.ofproto
actions = []
actions.append(parser.OFPActionSetField(eth_src=self.get_port_mac(path[0], port_pair[0])))
actions.append(parser.OFPActionSetField(eth_dst=self.get_port_mac(path[1], port_pair[1])))
actions.append(parser.OFPActionOutput(out_port))
match = parser.OFPMatch(
in_port=in_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(datapath_first,
1, match, actions, idle_timeout=10, hard_timeout=30)
# the last hop: tor -> host
datapath = self.datapaths[path[-1]]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
actions = []
src_port = self.get_link2port(path[-2], path[-1])[1]
dst_port = None
for key in self.access_table.keys():
if flow_info[2] == self.access_table[key]:
dst_port = key[1]
break
actions.append(parser.OFPActionSetField(eth_src=flow_info[4]))
actions.append(parser.OFPActionSetField(eth_dst=flow_info[5]))
actions.append(parser.OFPActionOutput(dst_port))
match = parser.OFPMatch(
in_port=src_port,
eth_type=flow_info[0],
ipv4_src=flow_info[1],
ipv4_dst=flow_info[2])
self.add_flow(
datapath, 1, match, actions, idle_timeout=10, hard_timeout=30)
# first pkt_out
actions = []
actions.append(parser.OFPActionSetField(eth_src=self.get_port_mac(path[0], port_pair[0])))
actions.append(parser.OFPActionSetField(eth_dst=self.get_port_mac(path[1], port_pair[1])))
actions.append(parser.OFPActionOutput(out_port))
parser = datapath_first.ofproto_parser
msg_data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
msg_data = data
out = parser.OFPPacketOut(
datapath=datapath_first, buffer_id=buffer_id,
data=msg_data, in_port=in_port, actions=actions)
datapath_first.send_msg(out)
# last pkt_out
datapath = self.datapaths[path[-1]]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
actions = []
actions.append(parser.OFPActionSetField(eth_src=flow_info[4]))
actions.append(parser.OFPActionSetField(eth_dst=flow_info[5]))
actions.append(parser.OFPActionOutput(dst_port))
msg_data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
msg_data = data
out = parser.OFPPacketOut(
datapath=datapath, buffer_id=buffer_id,
data=msg_data, in_port=src_port, actions=actions)
datapath.send_msg(out)
##*** not neede for our topo
#else: # src and dst on the same
# out_port = None
# actions = []
# for key in self.access_table.keys():
# if flow_info[2] == self.access_table[key]:
# out_port = key[1]
# break
# actions.append(parser.OFPActionOutput(out_port))
# match = parser.OFPMatch(
# in_port=in_port,
# eth_type=flow_info[0],
# ipv4_src=flow_info[1],
# ipv4_dst=flow_info[2])
# self.add_flow(
# datapath_first, 1, match, actions,
# idle_timeout=10, hard_timeout=30)
#
# # pkt_out
# msg_data = None
# if buffer_id == ofproto.OFP_NO_BUFFER:
# msg_data = data
#
# out = parser.OFPPacketOut(
# datapath=datapath_first, buffer_id=buffer_id,
# data=msg_data, in_port=in_port, actions=actions)
# datapath_first.send_msg(out)
@set_ev_cls(event.EventHostAdd)
def _event_host_add_handler(self, ev):
msg = ev.host.to_dict()
self.hosts.append(copy.deepcopy(msg))
@set_ev_cls(dpset.EventDP, MAIN_DISPATCHER)
def _event_dp_handler(self, ev):
dpid = ev.dp.id
# self.logger.info('Learning ports'' MAC addresses of switch %d\n', dpid)
self.dpid_port_mac[dpid] = []
for port in ev.ports:
tmp_dict = {}
tmp_dict[port.port_no] = port.hw_addr
self.dpid_port_mac[dpid].append(tmp_dict)
#self.dpid_port_mac[dpid].append([port.port_no, port.hw_addr])
# self.logger.info('List of port MAC addresses is %s\n', self.dpid_port_mac)
def get_port_mac(self, dpid, port):
associated_ports = self.dpid_port_mac[dpid]
port_mac = 0
for item in associated_ports:
for pp in item:
if port==pp:
port_mac = item[pp]
break
return port_mac
def get_host_location(self, host_ip):
for key in self.access_table:
if self.access_table[key] == host_ip:
return key
self.logger.debug("%s location is not found." % host_ip)
return None
def get_link2port(self, src_dpid, dst_dpid):
if (src_dpid, dst_dpid) in self.link_to_port:
return self.link_to_port[(src_dpid, dst_dpid)]
else:
self.logger.debug("Link to port is not found.")
return None
'''
In packet_in handler, we need to learn access_table by ARP.
Therefore, the first packet from UNKOWN host MUST be ARP.
'''
@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']
pkt = packet.Packet(msg.data)
eth_src = pkt.get_protocols(ethernet.ethernet)[0].src
eth_dst = pkt.get_protocols(ethernet.ethernet)[0].dst
eth_type = pkt.get_protocols(ethernet.ethernet)[0].ethertype
arp_pkt = pkt.get_protocol(arp.arp)
ip_pkt = pkt.get_protocol(ipv4.ipv4)
if arp_pkt:
arp_src_ip = arp_pkt.src_ip
arp_dst_ip = arp_pkt.dst_ip
# record the access info
if in_port in self.access_ports[datapath.id]:
self.access_table[(datapath.id, in_port)] = arp_src_ip
result = self.get_host_location(arp_dst_ip)
if result: # host record in access table.
datapath_dst, out_port = result[0], result[1]
actions = [parser.OFPActionOutput(out_port)]
datapath = self.datapaths[datapath_dst]
out = parser.OFPPacketOut(
datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions, data=msg.data)
datapath.send_msg(out)
else: # access info is not existed. send to all host.
for dpid in self.access_ports:
for port in self.access_ports[dpid]:
if (dpid, port) not in self.access_table.keys():
actions = [parser.OFPActionOutput(port)]
datapath = self.datapaths[dpid]
out = parser.OFPPacketOut(
datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions, data=msg.data)
datapath.send_msg(out)
if isinstance(ip_pkt, ipv4.ipv4):
ip_src = ip_pkt.src
ip_dst = ip_pkt.dst
result = None
src_sw = None
dst_sw = None
paths = []
src_location = self.get_host_location(ip_src)
dst_location = self.get_host_location(ip_dst)
if src_location:
src_sw = src_location[0]
if dst_location:
dst_sw = dst_location[0]
if self.graph == None:
self.logger.info("Graph is empty.")
self.network_aware.get_topology(None) # Reflesh the topology database.
if src_sw not in self.G.nodes():
self.network_aware.get_topology(None) # Reflesh the topology database.
if src_sw != None and dst_sw != None:
#self.G = self.network_aware.G
paths = [nx.dijkstra_path(self.G, source=src_sw, target=dst_sw, weight=None)]
self.logger.info("Path is %s", paths)
else:
self.network_aware.get_topology(None)
if paths:
install_flow_flag = True
if self.hosts:
install_flow_flag = False
for h in self.hosts:
if h['mac'] == eth_dst or h['mac'] == eth_src:
install_flow_flag = True
break
if not install_flow_flag:
return
self.logger.info(" PATH[%s --> %s]:%s\n" % (ip_src, ip_dst, paths[0]))
flow_info = [eth_type, ip_src, ip_dst, in_port, eth_src, eth_dst]
flow ={}
flow['info'] = flow_info
flow['path'] = paths[0]
if flow not in self.flows:
self.flows.append(flow)
self.install_flow(paths, flow_info, msg.buffer_id, msg.data)
else:
# Reflesh the topology database.
self.network_aware.get_topology(None)
@handler.set_ev_cls(event.EventLinkDelete)
def link_del_handler(self, ev):
#self.lock.acquire()
self.logger.info("Link down: "+ str(ev))
link = ev.link
src = link.src
dst = link.dst
removed_link = link
tmp_list = []
for l in self.network_aware.links:
if l != link:
tmp_list.append(l)
self.network_aware.update_topology(tmp_list)
self.G = self.network_aware.G
self.logger.info( "\t Removed link is %s \n", removed_link)
if removed_link is not None and (dst.dpid == 1 and src.dpid == 2) and (not self.failed_link): ### failure of link 2 --> 1, only consider of the failure events
self.logger.info("Update topo\n")
self.failed_link =True
self.network_aware.update_topology(tmp_list)
self.G = self.network_aware.G
#print "delete flows"
affected_flows = []
for f in self.flows:
if src.dpid in f['path'] and dst.dpid in f['path']:
affected_flows.append(f)
tmp_sw = []
for a in affected_flows:
for sw in a['path']:
if sw not in tmp_sw:
tmp_sw.append(sw)
for d in tmp_sw:
self.network_aware.clearAllFlowsAndGroups(self.datapaths[d]) ## or only delete the related flows
for ff in self.flows:
if ff in affected_flows:
self.flows.remove(ff)
self.logger.info("Affected flowssssssssss are %s\n", affected_flows)
for aa in affected_flows:
p = aa['path']
src_sw = p[0]
dst_sw = p[-1]
paths = [nx.dijkstra_path(self.G, source=src_sw, target=dst_sw, weight=None)]
self.install_flow_reactive(paths, aa['info'])
self.logger.info("Path is %s", paths[0])
#temp_list = list(reversed(paths[0]))
#self.install_flow_reactive([temp_list], aa['info'])
#self.logger.info("Path is %s", temp_list)
self.network_aware.get_topology(None)
# self.lock.release()