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service_slicing.py
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service_slicing.py
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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.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types
from ryu.lib.packet import udp
from ryu.lib.packet import tcp
from ryu.lib.packet import icmp
class TrafficSlicing(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(TrafficSlicing, self).__init__(*args, **kwargs)
# outport = self.mac_to_port[dpid][mac_address]
self.mac_to_port = {
1: {"00:00:00:00:00:01": 3, "00:00:00:00:00:02": 4},
4: {"00:00:00:00:00:03": 3, "00:00:00:00:00:04": 4},
}
self.slice_TCport = 9999
# outport = self.slice_ports[dpid][slicenumber]
self.slice_ports = {1: {1: 1, 2: 2}, 4: {1: 1, 2: 2}}
self.end_swtiches = [1, 4]
@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
# install the table-miss flow entry.
match = parser.OFPMatch()
actions = [
parser.OFPActionOutput(ofproto.OFPP_CONTROLLER, ofproto.OFPCML_NO_BUFFER)
]
self.add_flow(datapath, 0, match, actions)
def add_flow(self, datapath, priority, match, actions):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# construct flow_mod message and send it.
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = parser.OFPFlowMod(
datapath=datapath, priority=priority, match=match, instructions=inst
)
datapath.send_msg(mod)
def _send_package(self, msg, datapath, in_port, actions):
data = None
ofproto = datapath.ofproto
if msg.buffer_id == ofproto.OFP_NO_BUFFER:
data = msg.data
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath,
buffer_id=msg.buffer_id,
in_port=in_port,
actions=actions,
data=data,
)
datapath.send_msg(out)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
in_port = msg.match["in_port"]
pkt = packet.Packet(msg.data)
eth = pkt.get_protocol(ethernet.ethernet)
if eth.ethertype == ether_types.ETH_TYPE_LLDP:
# ignore lldp packet
return
dst = eth.dst
src = eth.src
dpid = datapath.id
if dpid in self.mac_to_port:
if dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][dst]
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
match = datapath.ofproto_parser.OFPMatch(eth_dst=dst)
self.add_flow(datapath, 1, match, actions)
self._send_package(msg, datapath, in_port, actions)
elif (pkt.get_protocol(udp.udp) and pkt.get_protocol(udp.udp).dst_port == self.slice_TCport):
slice_number = 1
out_port = self.slice_ports[dpid][slice_number]
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port,
eth_dst=dst,
eth_type=ether_types.ETH_TYPE_IP,
ip_proto=0x11, # udp
udp_dst=self.slice_TCport,
)
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.add_flow(datapath, 2, match, actions)
self._send_package(msg, datapath, in_port, actions)
elif (pkt.get_protocol(udp.udp) and pkt.get_protocol(udp.udp).dst_port != self.slice_TCport):
slice_number = 2
out_port = self.slice_ports[dpid][slice_number]
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port,
eth_dst=dst,
eth_src=src,
eth_type=ether_types.ETH_TYPE_IP,
ip_proto=0x11, # udp
udp_dst=pkt.get_protocol(udp.udp).dst_port,
)
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.add_flow(datapath, 1, match, actions)
self._send_package(msg, datapath, in_port, actions)
elif pkt.get_protocol(tcp.tcp):
slice_number = 2
out_port = self.slice_ports[dpid][slice_number]
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port,
eth_dst=dst,
eth_src=src,
eth_type=ether_types.ETH_TYPE_IP,
ip_proto=0x06, # tcp
)
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.add_flow(datapath, 1, match, actions)
self._send_package(msg, datapath, in_port, actions)
elif pkt.get_protocol(icmp.icmp):
slice_number = 2
out_port = self.slice_ports[dpid][slice_number]
match = datapath.ofproto_parser.OFPMatch(
in_port=in_port,
eth_dst=dst,
eth_src=src,
eth_type=ether_types.ETH_TYPE_IP,
ip_proto=0x01, # icmp
)
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
self.add_flow(datapath, 1, match, actions)
self._send_package(msg, datapath, in_port, actions)
elif dpid not in self.end_swtiches:
out_port = ofproto.OFPP_FLOOD
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
match = datapath.ofproto_parser.OFPMatch(in_port=in_port)
self.add_flow(datapath, 1, match, actions)
self._send_package(msg, datapath, in_port, actions)