simple_switch.py

import networkx.algorithms as nx
# Python Standard
import logging
import array
import thread
import struct
import host


# Ryu
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.topology import event
from ryu.lib import addrconv
from ryu.ofproto import ofproto_v1_2
from ryu.ofproto import ether
from ryu.lib.mac import haddr_to_bin
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 udp
from ryu.lib.packet import dhcp
from ryu.topology.switches import Switch
from ryu.topology.switches import Port
from ryu.lib.packet import arp


from protocol_handler import dhcp_handler
from protocol_handler import lldp_handler
from protocol_handler import arp_handler
from protocol_handler import ipv4_handler
from protocol_handler import ip_mobility_handler
from protocol_handler import nat_handler
from netmap import netmap


LOG = logging.getLogger(__name__)


class SimpleSwitch(app_manager.RyuApp):
    OFP_VERSIONS = [ofproto_v1_2.OFP_VERSION]

    def add_flow(self, datapath, out_port, actions, match):
        LOG.debug("--- Add FLow matching based on IPAddress")
        ofproto = datapath.ofproto

        instructions = [datapath.ofproto_parser.OFPInstructionActions(
            ofproto_v1_2.OFPIT_APPLY_ACTIONS, actions=actions)]

        mod = datapath.ofproto_parser.OFPFlowMod(
            datapath=datapath, match=match, cookie=0, cookie_mask=0,
            command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0, out_port=out_port, flags=ofproto.OFPFF_SEND_FLOW_REM, instructions=instructions, priority=3)
        datapath.send_msg(mod)

    def del_flow(self, datapath, match, out_port, out_group):
        LOG.debug("--- delete FLow matching based on IPAddress")
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        for switch in self.networkMap.getAllSwitches():
            if isinstance(switch, Switch):
                datapath = switch.dp
                mod = parser.OFPFlowMod(
                    datapath=datapath, match=match, cookie=0,
                    command=ofproto.OFPFC_DELETE, out_port=out_port, out_group=out_group)
                datapath.send_msg(mod)

    @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
    def _switch_features_handler(self, ev):
        msg = ev.msg
        datapath = msg.datapath
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        actions = [parser.OFPActionOutput(port=ofproto.OFPP_CONTROLLER,
                                          max_len=ofproto.OFPCML_NO_BUFFER)]
        inst = [parser.OFPInstructionActions(type_=ofproto.OFPIT_APPLY_ACTIONS,
                                             actions=actions)]
        mod = parser.OFPFlowMod(datapath=datapath,
                                priority=1,
                                match=parser.OFPMatch(),
                                instructions=inst)
        datapath.send_msg(mod)

    def __init__(self, *args, **kwargs):
        super(SimpleSwitch, self).__init__(*args, **kwargs)

        self.movedHosts = {}
        # Instance of the NetworkMap
        self.networkMap = netmap.netmap()
        # Instance of DHCP Handler
        self.dhcph = dhcp_handler.dhcp_handler(self.networkMap)
        # Instance of icmp_handler
        self.icmp = ipv4_handler.ipv4_handler(self.networkMap)
        # Instance of nat_handler
        self.nat = nat_handler.nat_handler(self.networkMap)
        # Instance of Arp Handler
        self.arph = arp_handler.arp_handler(self.networkMap)
        # Instance of LLDP Handler
        self.lldph = lldp_handler.lldp_handler(self.networkMap)
        # LLDP Deamon
        self.ip_mobility = ip_mobility_handler.ip_mobility_handler(
            self.networkMap)
        # Instance of ip_mobility_handler

        try:
            thread.start_new_thread(
                self.lldph._execute_lldp, (10, self._send_data))
        except:
            LOG.debug("--- LLDP Doesn't start")

    def _find_protocol(self, pkt, name):
        for p in pkt.protocols:
            if hasattr(p, 'protocol_name'):
                if p.protocol_name == name:
                    return p

    @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
    def _packet_in_handler(self, ev):
        msg = ev.msg
        datapath = msg.datapath
        parser = datapath.ofproto_parser
        ofproto = datapath.ofproto
        in_port = msg.match['in_port']
        pkt = packet.Packet(data=msg.data)
        eth = pkt.get_protocol(ethernet.ethernet)
        dpid = datapath.id
        pkt_tcp = self._find_protocol(pkt, "tcp")
        pkt_udp = self._find_protocol(pkt, "udp")
        p_ipv4 = self._find_protocol(pkt, "ipv4")
        p_icmp = self._find_protocol(pkt, "icmp")

        # The flow rules of NAT
        # if pkt_tcp and p_ipv4:
        #     print "@@@ Install TCP Flow Entry @@@"
        #     tcp_src = pkt_tcp.src_port
        #     tcp_dst = pkt_tcp.dst_port
        #     self.nat.tcp_handle(tcp_src, tcp_dst, p_ipv4, msg, in_port, eth, self.add_flow)
        # elif pkt_udp and p_ipv4 and not pkt.get_protocols(dhcp.dhcp):
        #     print "@@@ Install UDP Flow Entry @@@"
        #     udp_src = pkt_udp.src_port
        #     udp_dst = pkt_udp.dst_port
        #     self.nat.tcp_handle(udp_src, udp_dst, p_ipv4, msg, in_port, eth, self.add_flow)

        # The flow rules with test of icmp
        if pkt.get_protocols(dhcp.dhcp):
            self.dhcph._handle_dhcp(msg, datapath, self._send_packet)
        elif p_ipv4 and p_ipv4.dst not in self.movedHosts:
            self.icmp.handle(p_ipv4, msg, in_port, eth, self.add_flow)
        elif self._find_protocol(pkt, "arp"):
            self.arph.handle(msg, self._send_packet)
        elif self._find_protocol(pkt, "lldp"):
            self.lldph.handle(msg, self._send_packet)
        if p_ipv4 and p_ipv4.dst in self.movedHosts:
        	dst_mac = self.movedHosts.get(p_ipv4.dst, "none")
        	self.ip_mobility.handle(p_ipv4, msg, in_port, eth, dst_mac, self.add_flow)
        else:
            LOG.debug(" --- No Supported Protocol")
            for p in pkt.protocols:
                if hasattr(p, 'protocol_name'):
                    LOG.debug(p.protocol_name)

    @set_ev_cls(event.EventSwitchEnter)
    def get_topology_data(self, ev):
        if ev.switch is not None:
            switch = ev.switch
            self.networkMap.addSwitch(switch)

    @set_ev_cls(event.EventSwitchLeave)
    def remove_topology_data(self, ev):
        if ev.switch is not None:
            switch = ev.switch
            self.networkMap.delSwitch(switch)
            if len(self.networkMap.getAllSwitches()) == 0:
                self.networkMap.flushInactiveHosts()

    def _send_packet(self, datapath, actions, pkt, in_port):
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        # self.logger.info("packet-out %s" % (pkt,))
        pkt.serialize()
        data = pkt.data
        out = parser.OFPPacketOut(datapath=datapath,
                                  buffer_id=ofproto.OFP_NO_BUFFER,
                                  in_port=in_port,
                                  actions=actions,
                                  data=data)
        datapath.send_msg(out)

    def _send_data(self, datapath, actions, data, in_port):
        ofproto = datapath.ofproto
        parser = datapath.ofproto_parser
        out = parser.OFPPacketOut(datapath=datapath,
                                  buffer_id=ofproto.OFP_NO_BUFFER,
                                  in_port=in_port,
                                  actions=actions,
                                  data=data)
        datapath.send_msg(out)

    @set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
    def _port_status_handler(self, ev):
        msg = ev.msg
        datapath = msg.datapath
        dpid = datapath.id
        ofproto = datapath.ofproto
        reason = msg.reason
        port_no = msg.desc.port_no
        parser = datapath.ofproto_parser

        self.logger.info("slave state changed port: %d enabled: %s",)

        if reason == ofproto.OFPPR_ADD:
            self.logger.info("port added %s", port_no)
            self.logger.info("dpid %s", dpid)
            self.logger.info("dpid %s", msg.desc)
            self.networkMap.findSwitchByDatapath(datapath).add_port(msg.desc)
            self.networkMap.addPort(port_no, datapath)
        elif reason == ofproto.OFPPR_DELETE:
            host = self.networkMap.findHostByPort(port_no, datapath)
            if host is not None:
                self.networkMap.deleteHost(host)
                self.movedHosts[host.ip] = host.mac
                self.logger.info("port deleted %s", port_no)
                match = parser.OFPMatch(ipv4_src=host.ip, eth_type=0x0800)
                self.del_flow(
                    datapath, match, out_port=ofproto.OFPP_ANY, out_group=ofproto.OFPG_ANY)
                match = parser.OFPMatch(ipv4_dst=host.ip, eth_type=0x0800)
                self.del_flow(
                    datapath, match, out_port=ofproto.OFPP_ANY, out_group=ofproto.OFPG_ANY)
            else:
                LOG.debug("There was no Host found on the deleted port")
            switch = self.networkMap.findSwitchByDatapath(datapath)
            self.networkMap.delPort(
                self.networkMap.findPortByPath(datapath.id, port_no))
            switch.ports.remove(
                Port(switch.dp.id, switch.dp.ofproto, msg.desc))
        elif reason == ofproto.OFPPR_MODIFY:
            self.logger.info("port modified %s", port_no)
        else:
            self.logger.info("Illeagal port state %s %s", port_no, reason)