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Controller script.py
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Controller script.py
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from ryu.base import app_manager
from ryu.controller import ofp_event
import ryu.app.ofctl.api as api
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_0
from ryu.lib.mac import haddr_to_bin
from ryu.lib.ip import ipv4_to_int
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet, arp, ipv4
from ryu.lib.packet import ether_types
from ryu.lib import addrconv
class SimpleSwitch(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch, self).__init__(*args, **kwargs)
self.mac_to_port = {}
def add_flow(self, datapath, in_port, src_ip, dst_ip, actions, eth):
ofproto = datapath.ofproto
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port, nw_src=ipv4_to_int(src_ip), nw_dst=ipv4_to_int(dst_ip), dl_type =
ether_types.ETH_TYPE_IP or ether_types.ETH_TYPE_ARP )
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0,
command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
priority=ofproto.OFP_DEFAULT_PRIORITY,
flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
datapath.send_msg(mod)
def arp_reply(self,datapath, src, dst, dst_ip, src_ip, eth, msg):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=eth.ethertype, dst=src, src=dst))
pkt.add_protocol(arp.arp(opcode=2, src_mac=dst, src_ip=dst_ip, dst_mac=src, dst_ip=src_ip))
pkt.serialize()
self.logger.info("packet-out %s", pkt)
actions = [parser.OFPActionOutput(port=msg.in_port)]
data = pkt.data
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions,
data=data)
datapath.send_msg(out)
#self.logger.info("executed for dpid %s", datapath.id)
def add_entry(self, datapath, in_port, src_ip, dst_ip, out_port, eth):
ofproto = datapath.ofproto
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.add_flow(datapath, in_port, src_ip, dst_ip, actions, eth)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
pkt = packet.Packet(msg.data)
eth = pkt.get_protocol(ethernet.ethernet)
pkt_arp = pkt.get_protocol(arp.arp)
dst = eth.dst
src = eth.src
dpid = datapath.id
datapath_s2 = api.get_datapath(self,2)
datapath_s1 = api.get_datapath(self,1)
if eth.ethertype == ether_types.ETH_TYPE_LLDP:
# ignore lldp packet
return
if eth.ethertype == ether_types.ETH_TYPE_ARP:
self.logger.info("arp dpid %s", datapath.id)
if pkt_arp.opcode == arp.ARP_REQUEST and dpid == 1:
dst_ip = pkt_arp.dst_ip
src_ip = pkt_arp.src_ip
self.logger.info("%s sends arp request to %s through %s with opcode %s in port %s", src_ip, dst_ip, dpid, pkt_arp.opcode, msg.in_port)
self.arp_reply(datapath, src, '00:00:00:00:00:02', dst_ip, src_ip, eth, msg)
#2 entries for switch 1
self.add_entry(datapath, 1, '10.0.0.1','10.0.0.2', 2, eth)
self.add_entry(datapath, 2, '10.0.0.2','10.0.0.1', 1, eth)
#2 entries for switch 2
datapath = datapath_s2
self.add_entry(datapath, 1, '10.0.0.2','10.0.0.1', 2, eth)
self.add_entry(datapath, 2, '10.0.0.1','10.0.0.2', 1, eth)
if pkt_arp.opcode == arp.ARP_REQUEST and dpid == 2:
dst_ip = pkt_arp.dst_ip
src_ip = pkt_arp.src_ip
self.logger.info("%s sends arp request to %s through %s with opcode %s in port %s", src_ip, dst_ip, dpid, pkt_arp.opcode, msg.in_port)
self.arp_reply(datapath_s2, src, '00:00:00:00:00:01', dst_ip, src_ip, eth, msg)
#2 entries for switch 2
self.add_entry(datapath, 1, '10.0.0.2','10.0.0.1', 2, eth)
self.add_entry(datapath, 2, '10.0.0.1','10.0.0.2', 1, eth)
#2 entries for switch 1
datapath = datapath_s1
self.add_entry(datapath, 1, '10.0.0.1','10.0.0.2', 2, eth)
self.add_entry(datapath, 2, '10.0.0.2','10.0.0.1', 1, eth)