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Remove controller_1_3 and replace it with controller_1_3_1

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structix
2022-05-29 20:59:16 +02:00
parent 26b35cc2e5
commit 2965053154
3 changed files with 61 additions and 557 deletions
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153
Uebung1/Aufgabe1.3.mn
View File

@@ -1,153 +0,0 @@
{
"application": {
"dpctl": "",
"ipBase": "10.0.0.0/8",
"netflow": {
"nflowAddId": "0",
"nflowTarget": "",
"nflowTimeout": "600"
},
"openFlowVersions": {
"ovsOf10": "0",
"ovsOf11": "0",
"ovsOf12": "0",
"ovsOf13": "1"
},
"sflow": {
"sflowHeader": "128",
"sflowPolling": "30",
"sflowSampling": "400",
"sflowTarget": ""
},
"startCLI": "1",
"switchType": "ovs",
"terminalType": "xterm"
},
"controllers": [
{
"opts": {
"controllerProtocol": "tcp",
"controllerType": "remote",
"hostname": "c0",
"remoteIP": "127.0.0.1",
"remotePort": 6633
},
"x": "791.0",
"y": "340.0"
}
],
"hosts": [
{
"number": "3",
"opts": {
"defaultRoute": "10.0.3.62",
"hostname": "h3",
"ip": "10.0.3.1/26",
"nodeNum": 3,
"sched": "host"
},
"x": "754.0",
"y": "143.0"
},
{
"number": "4",
"opts": {
"defaultRoute": "10.0.4.2",
"hostname": "h4",
"ip": "10.0.4.1/30",
"nodeNum": 4,
"sched": "host"
},
"x": "355.0",
"y": "444.0"
},
{
"number": "2",
"opts": {
"defaultRoute": "10.0.2.254",
"hostname": "h2",
"ip": "10.0.2.1/24",
"nodeNum": 2,
"sched": "host"
},
"x": "300.0",
"y": "145.0"
},
{
"number": "1",
"opts": {
"defaultRoute": "10.0.1.14",
"hostname": "h1",
"ip": "10.0.1.1/28",
"nodeNum": 1,
"sched": "host"
},
"x": "452.0",
"y": "66.0"
}
],
"links": [
{
"dest": "h4",
"opts": {},
"src": "s2"
},
{
"dest": "s2",
"opts": {},
"src": "s1"
},
{
"dest": "s1",
"opts": {},
"src": "h2"
},
{
"dest": "s1",
"opts": {},
"src": "h1"
},
{
"dest": "h3",
"opts": {},
"src": "s1"
}
],
"switches": [
{
"number": "1",
"opts": {
"controllers": [
"c0"
],
"dpid": "1",
"hostname": "s1",
"netflow": "0",
"nodeNum": 1,
"sflow": "0",
"switchIP": "",
"switchType": "default"
},
"x": "576.0",
"y": "181.0"
},
{
"number": "2",
"opts": {
"controllers": [
"c0"
],
"dpid": "2",
"hostname": "s2",
"netflow": "0",
"nodeNum": 2,
"sflow": "0",
"switchIP": "",
"switchType": "default"
},
"x": "357.0",
"y": "300.0"
}
],
"version": "2"
}

96
Uebung1/controller_1_3.py
View File

@@ -1,3 +1,6 @@
# Abgabe von:
# Jutta Seth, Janek Schoffit, Eva Hoegner
# Problem 1.3 (IP Router for IPv4)
from ryu.base import app_manager from ryu.base import app_manager
from ryu.controller import ofp_event from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
@@ -11,10 +14,14 @@ from ryu.lib.packet import icmp
from ryu.lib.packet.arp import arp from ryu.lib.packet.arp import arp
from ryu.lib.packet.packet import Packet from ryu.lib.packet.packet import Packet
# For IP address subnet matching
import ipaddress
class L3Switch(app_manager.RyuApp): class L3Switch(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION] OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
IP_ADDR = ["10.0.1.14", "10.0.2.254", "10.0.2.252", "10.0.3.62", "10.0.4.2"] IP_ADDR = ["10.0.2.254", "10.0.2.252", "10.0.1.14", "10.0.3.62", "10.0.4.2"]
MAC_ADDR = ["52:00:00:00:00:01", "52:00:00:00:00:02"] MAC_ADDR = ["52:00:00:00:00:01", "52:00:00:00:00:02"]
def __init__(self, *args, **kwargs): def __init__(self, *args, **kwargs):
@@ -40,30 +47,6 @@ class L3Switch(app_manager.RyuApp):
ofproto.OFPCML_NO_BUFFER)] ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions) self.add_flow(datapath, 0, match, actions)
self.logger.info("Add new action for: ")
self.logger.info(datapath.id)
# Routing Switch 2 to 1
if datapath.id == 2:
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[1]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[0]), # set dst switch
parser.OFPActionOutput(1)]
match = parser.OFPMatch(ipv4_src=("10.0.4.1", "255.255.255.252"), ipv4_dst=("10.0.1.1", "255.255.255.240"), eth_type=0x0800)
#match = parser.OFPMatch(ipv4_src="10.0.4.1", ipv4_dst="10.0.1.1", eth_type=0x0800)
self.add_flow(datapath, 0, match, actions)
# Routing Switch 1 to 2
if datapath.id == 1:
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[0]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[1]), # set dst switch
parser.OFPActionOutput(4)]
match = parser.OFPMatch(ipv4_dst=("10.0.4.1", "255.255.255.252"), eth_type=0x0800)
self.add_flow(datapath, 0, match, actions)
def add_flow(self, datapath, priority, match, actions, buffer_id=None): def add_flow(self, datapath, priority, match, actions, buffer_id=None):
ofproto = datapath.ofproto ofproto = datapath.ofproto
@@ -109,16 +92,17 @@ class L3Switch(app_manager.RyuApp):
dpid = datapath.id dpid = datapath.id
ofproto = datapath.ofproto ofproto = datapath.ofproto
parser = datapath.ofproto_parser parser = datapath.ofproto_parser
macaddr = self.MAC_ADDR[dpid-1]
arpPacket = packet.get_protocol(arp) arpPacket = packet.get_protocol(arp)
if arpPacket.opcode == 1 : if arpPacket.opcode == 1 :
# arp request # arp request
arp_dstIp = arpPacket.dst_ip arp_dstIp = arpPacket.dst_ip
self.logger.info('received ARP Request %s => %s (port%d)'%(frame.src, frame.dst, inPort)) self.logger.info('received ARP Request %s => %s (port%d, ip: %s)'%(frame.src, frame.dst, inPort, arp_dstIp))
if arp_dstIp in self.IP_ADDR: if arp_dstIp in self.IP_ADDR:
# this switch was requested # this switch was requested
opcode = 2 opcode = 2
srcMAC = self.MAC_ADDR[dpid-1] srcMAC = macaddr
srcIP = arp_dstIp srcIP = arp_dstIp
dstMAC = frame.src dstMAC = frame.src
dstIP = arpPacket.src_ip dstIP = arpPacket.src_ip
@@ -191,13 +175,14 @@ class L3Switch(app_manager.RyuApp):
self.send_packet(datapath, outPort, p) self.send_packet(datapath, outPort, p)
def do_icmp(self, datapath, port, pkt_ethernet, pkt_ipv4, pkt_icmp): def do_icmp(self, datapath, port, pkt_ethernet, pkt_ipv4, pkt_icmp):
dpid = datapath.id self.logger.info(pkt_icmp.type)
self.logger.info(icmp.ICMP_ECHO_REQUEST)
if pkt_icmp.type != icmp.ICMP_ECHO_REQUEST: if pkt_icmp.type != icmp.ICMP_ECHO_REQUEST:
return return
pkt = packet.Packet() pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=pkt_ethernet.ethertype, pkt.add_protocol(ethernet.ethernet(ethertype=pkt_ethernet.ethertype,
dst=pkt_ethernet.src, dst=pkt_ethernet.src,
src=self.MAC_ADDR[dpid])) src=self.MAC_ADDR[datapath.id-1]))
pkt.add_protocol(ipv4.ipv4(dst=pkt_ipv4.src, pkt.add_protocol(ipv4.ipv4(dst=pkt_ipv4.src,
src=pkt_ipv4.dst, src=pkt_ipv4.dst,
proto=pkt_ipv4.proto)) proto=pkt_ipv4.proto))
@@ -205,7 +190,8 @@ class L3Switch(app_manager.RyuApp):
code=icmp.ICMP_ECHO_REPLY_CODE, code=icmp.ICMP_ECHO_REPLY_CODE,
csum=0, csum=0,
data=pkt_icmp.data)) data=pkt_icmp.data))
self.logger.info("do icmp: %s" %(pkt)) self.logger.info("do icmp: %s" %(pkt,))
self.logger.info("port: %s" %(port))
self.send_packet(datapath, port, pkt) self.send_packet(datapath, port, pkt)
def do_l2_switch(self, datapath, dpid, packet, frame, in_port, buffer_id=None): def do_l2_switch(self, datapath, dpid, packet, frame, in_port, buffer_id=None):
@@ -242,21 +228,59 @@ class L3Switch(app_manager.RyuApp):
parser = datapath.ofproto_parser parser = datapath.ofproto_parser
if ipv4_pkt.dst in self.ip_to_mac[dpid]: if ipv4_pkt.dst in self.ip_to_mac[dpid]:
# GEt mac and port of the given destination # Get mac and port of the given destination
dstMac = self.ip_to_mac[dpid][ipv4_pkt.dst] dstMac = self.ip_to_mac[dpid][ipv4_pkt.dst]
out_port = self.mac_to_port[dpid][dstMac] out_port = self.mac_to_port[dpid][dstMac]
else: else:
# This flow is for the second switch if the address is in range 10.0.0.0-10.0.3.255
# The ipaddress module assumes an IP adress as a unicode string (python 2.7 default for a string is ascii encoding)
if datapath.id == 2 and ipaddress.ip_address(unicode(ipv4_pkt.dst)) in ipaddress.ip_network(unicode("10.0.0.0/22")):
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[1]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[0]), # set dst switch
parser.OFPActionOutput(2)]
match = parser.OFPMatch(ipv4_dst=("10.0.0.0", "255.255.252.0"), eth_dst=self.MAC_ADDR[1], eth_type=0x0800)
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
in_port=in_port, actions=actions, data=data)
datapath.send_msg(out)
return
# Add a flow for the first switch if the ipadress matches network 4.
if datapath.id == 1 and ipaddress.ip_address(unicode(ipv4_pkt.dst)) in ipaddress.ip_network(unicode("10.0.4.0/30")):
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[0]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[1]), # set dst switch
parser.OFPActionOutput(1)]
match = parser.OFPMatch(ipv4_dst=("10.0.4.0", "255.255.255.252"), eth_dst=self.MAC_ADDR[0], eth_type=0x0800)
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
in_port=in_port, actions=actions, data=data)
datapath.send_msg(out)
return
# Send an arp request and define mac and port # Send an arp request and define mac and port
# so we're able to apply the following actions # so we're able to apply the following actions
# on the packet. # on the packet.
out_port = ofproto.OFPP_FLOOD out_port = ofproto.OFPP_FLOOD
dstMac = "FF:FF:FF:FF:FF:FF" dstMac = "FF:FF:FF:FF:FF:FF"
self.send_arp(datapath, 1, self.MAC_ADDR[dpid-1], ipv4_pkt.src, dstMac, ipv4_pkt.dst, out_port) self.send_arp(datapath, 1, self.MAC_ADDR[datapath.id-1], ipv4_pkt.src, dstMac, ipv4_pkt.dst, out_port)
# Actions are applied in the same order as defined in the list. # Actions are applied in the same order as defined in the list.
# OFPActionOutput terminates the chain. So this call should be the last action. # OFPActionOutput terminates the chain. So this call should be the last action.
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[1]), # set own mac as source parser.OFPActionSetField(eth_src=self.MAC_ADDR[datapath.id-1]), # set own mac as source
parser.OFPActionSetField(eth_dst=dstMac), # set dst from arp request parser.OFPActionSetField(eth_dst=dstMac), # set dst from arp request
parser.OFPActionOutput(out_port)] # forward packet through out_port parser.OFPActionOutput(out_port)] # forward packet through out_port
@@ -313,17 +337,18 @@ class L3Switch(app_manager.RyuApp):
self.logger.info("packet in dpid: %s, src: %s, dest: %s, in_port: %s", dpid, src, dst, in_port) self.logger.info("packet in dpid: %s, src: %s, dest: %s, in_port: %s", dpid, src, dst, in_port)
self.logger.info(pkt) #self.logger.info(pkt)
#learn mac to port mapping #learn mac to port mapping
if src not in self.mac_to_port[dpid]: if src not in self.mac_to_port[dpid]:
self.mac_to_port[dpid][src] = in_port self.mac_to_port[dpid][src] = in_port
if eth.ethertype == ether_types.ETH_TYPE_ARP: if eth.ethertype == ether_types.ETH_TYPE_ARP and src not in self.MAC_ADDR:
self.do_arp(datapath, pkt, eth, in_port) self.do_arp(datapath, pkt, eth, in_port)
return return
if eth.ethertype == ether_types.ETH_TYPE_IP: if eth.ethertype == ether_types.ETH_TYPE_IP:
ipv4_pkt = pkt.get_protocol(ipv4.ipv4) ipv4_pkt = pkt.get_protocol(ipv4.ipv4)
self.logger.info("IP src: %s, dst: %s", ipv4_pkt.src, ipv4_pkt.dst)
#check if packet is for this switch #check if packet is for this switch
if ipv4_pkt.dst in self.IP_ADDR: if ipv4_pkt.dst in self.IP_ADDR:
@@ -333,7 +358,6 @@ class L3Switch(app_manager.RyuApp):
else: else:
# forward the package into a different subnet # forward the package into a different subnet
self.do_l3_switch(datapath, dpid, pkt, eth, ipv4_pkt, in_port, msg.buffer_id) self.do_l3_switch(datapath, dpid, pkt, eth, ipv4_pkt, in_port, msg.buffer_id)
return
# packet is not for this switch, so do l2 switching # packet is not for this switch, so do l2 switching

367
Uebung1/controller_1_3_1.py
View File

@@ -1,367 +0,0 @@
# Abgabe von:
# Jutta Seth, Janek Schoffit, Eva Hoegner
# Problem 1.3 (IP Router for IPv4)
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 ipv4
from ryu.lib.packet import icmp
from ryu.lib.packet.arp import arp
from ryu.lib.packet.packet import Packet
# For IP address subnet matching
import ipaddress
class L3Switch(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
IP_ADDR = ["10.0.2.254", "10.0.2.252", "10.0.1.14", "10.0.3.62", "10.0.4.2"]
MAC_ADDR = ["52:00:00:00:00:01", "52:00:00:00:00:02"]
def __init__(self, *args, **kwargs):
super(L3Switch, self).__init__(*args, **kwargs)
self.mac_to_port = {}
self.ip_to_mac = {}
@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 table-miss flow entry
#
# We specify NO BUFFER to max_len of the output action due to
# OVS bug. At this moment, if we specify a lesser number, e.g.,
# 128, OVS will send Packet-In with invalid buffer_id and
# truncated packet data. In that case, we cannot output packets
# correctly. The bug has been fixed in OVS v2.1.0.
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, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
if buffer_id:
mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
priority=priority, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
def send_packet(self, datapath, port, pkt, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
pkt.serialize()
self.logger.info("packet-out %s" % (pkt,))
data = pkt.data
actions = [parser.OFPActionOutput(port=port)]
if buffer_id:
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=buffer_id,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions,
data=data)
else:
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER,
actions=actions,
data=data)
datapath.send_msg(out)
def do_arp(self, datapath, packet, frame, inPort):
dpid = datapath.id
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
macaddr = self.MAC_ADDR[dpid-1]
arpPacket = packet.get_protocol(arp)
if arpPacket.opcode == 1 :
# arp request
arp_dstIp = arpPacket.dst_ip
self.logger.info('received ARP Request %s => %s (port%d, ip: %s)'%(frame.src, frame.dst, inPort, arp_dstIp))
if arp_dstIp in self.IP_ADDR:
# this switch was requested
opcode = 2
srcMAC = macaddr
srcIP = arp_dstIp
dstMAC = frame.src
dstIP = arpPacket.src_ip
outPort = inPort
# learn mac 2 port mapping
self.mac_to_port[dpid][dstMAC] = inPort
# learn ip 2 mac mapping
self.ip_to_mac[dpid][dstIP] = dstMAC
self.logger.info("send ARP reply %s => %s (port%d)" %(srcMAC, dstMAC, outPort))
else:
if arpPacket.dst_ip in self.ip_to_mac[dpid]:
# optimization: the switch already knows the mapping and can answer the request
opcode = 2
srcMAC = self.ip_to_mac[dpid][arpPacket.dst_ip]
srcIP = arpPacket.dst_ip
dstMAC = frame.src
dstIP = arpPacket.src_ip
outPort = self.mac_to_port[dpid][dstMAC]
self.logger.info("optimization: answer ARP request %s => %s (port%d)" %(srcMAC, dstMAC, outPort))
else:
# forward arp request
opcode = 1
srcMAC = frame.src
srcIP = arpPacket.src_ip
dstMAC = frame.dst
dstIP = arpPacket.dst_ip
outPort = ofproto.OFPP_FLOOD
# learn mac 2 port mapping
self.mac_to_port[dpid][srcMAC] = inPort
# learn ip 2 mac mapping
self.ip_to_mac[dpid][srcIP] = srcMAC
self.logger.info("froward ARP request %s => %s (port%d)" %(srcMAC, dstMAC, outPort))
elif arpPacket.opcode == 2 :
self.logger.info(arpPacket)
if arpPacket.dst_mac in self.MAC_ADDR:
# learn mac 2 port mapping
self.mac_to_port[dpid][arpPacket.src_mac] = inPort
# learn ip 2 mac mapping
self.ip_to_mac[dpid][arpPacket.src_ip] = arpPacket.src_mac
return
else:
opcode = 2
#arp reply
# forward arp reply
srcMAC = frame.src
srcIP = arpPacket.src_ip
dstMAC = frame.dst
dstIP = arpPacket.dst_ip
outPort = self.mac_to_port[dpid][dstMAC]
# learn mac 2 port mapping
self.mac_to_port[dpid][srcMAC] = inPort
# learn ip 2 mac mapping
self.ip_to_mac[dpid][srcIP] = srcMAC
self.logger.debug('forward ARP reply %s => %s (port%d)'%(frame.src ,frame.dst, inPort))
self.send_arp(datapath, opcode, srcMAC, srcIP, dstMAC, dstIP, outPort)
def send_arp(self, datapath, opcode, srcMac, srcIp, dstMac, dstIp, outPort):
if opcode == 1:
targetMac = "FF:FF:FF:FF:FF:FF"
targetIp = dstIp
elif opcode == 2:
targetMac = dstMac
targetIp = dstIp
e = ethernet.ethernet(dstMac, srcMac, ether_types.ETH_TYPE_ARP)
a = arp(1, 0x0800, 6, 4, opcode, srcMac, srcIp, targetMac, targetIp)
p = Packet()
p.add_protocol(e)
p.add_protocol(a)
self.send_packet(datapath, outPort, p)
def do_icmp(self, datapath, port, pkt_ethernet, pkt_ipv4, pkt_icmp):
self.logger.info(pkt_icmp.type)
self.logger.info(icmp.ICMP_ECHO_REQUEST)
if pkt_icmp.type != icmp.ICMP_ECHO_REQUEST:
return
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=pkt_ethernet.ethertype,
dst=pkt_ethernet.src,
src=self.MAC_ADDR[datapath.id-1]))
pkt.add_protocol(ipv4.ipv4(dst=pkt_ipv4.src,
src=pkt_ipv4.dst,
proto=pkt_ipv4.proto))
pkt.add_protocol(icmp.icmp(type_=icmp.ICMP_ECHO_REPLY,
code=icmp.ICMP_ECHO_REPLY_CODE,
csum=0,
data=pkt_icmp.data))
self.logger.info("do icmp: %s" %(pkt,))
self.logger.info("port: %s" %(port))
self.send_packet(datapath, port, pkt)
def do_l2_switch(self, datapath, dpid, packet, frame, in_port, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
if frame.dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][frame.dst]
else:
out_port = ofproto.OFPP_FLOOD
actions = [parser.OFPActionOutput(out_port)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
match = parser.OFPMatch(in_port=in_port, eth_dst=frame.dst)
# verify if we have a valid buffer_id, if yes avoid to send both
# flow_mod & packet_out
if buffer_id != ofproto.OFP_NO_BUFFER:
self.add_flow(datapath, 1, match, actions, buffer_id)
return
else:
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
in_port=in_port, actions=actions, data=data)
datapath.send_msg(out)
def do_l3_switch(self, datapath, dpid, packet, frame, ipv4_pkt, in_port, buffer_id=None):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
if ipv4_pkt.dst in self.ip_to_mac[dpid]:
# Get mac and port of the given destination
dstMac = self.ip_to_mac[dpid][ipv4_pkt.dst]
out_port = self.mac_to_port[dpid][dstMac]
else:
# This flow is for the second switch if the address is in range 10.0.0.0-10.0.3.255
# The ipaddress module assumes an IP adress as a unicode string (python 2.7 default for a string is ascii encoding)
if datapath.id == 2 and ipaddress.ip_address(unicode(ipv4_pkt.dst)) in ipaddress.ip_network(unicode("10.0.0.0/22")):
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[1]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[0]), # set dst switch
parser.OFPActionOutput(2)]
match = parser.OFPMatch(ipv4_dst=("10.0.0.0", "255.255.252.0"), eth_dst=self.MAC_ADDR[1], eth_type=0x0800)
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
in_port=in_port, actions=actions, data=data)
datapath.send_msg(out)
return
# Add a flow for the first switch if the ipadress matches network 4.
if datapath.id == 1 and ipaddress.ip_address(unicode(ipv4_pkt.dst)) in ipaddress.ip_network(unicode("10.0.4.0/30")):
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[0]), # set own mac as source
parser.OFPActionSetField(eth_dst=self.MAC_ADDR[1]), # set dst switch
parser.OFPActionOutput(1)]
match = parser.OFPMatch(ipv4_dst=("10.0.4.0", "255.255.255.252"), eth_dst=self.MAC_ADDR[0], eth_type=0x0800)
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=buffer_id,
in_port=in_port, actions=actions, data=data)
datapath.send_msg(out)
return
# Send an arp request and define mac and port
# so we're able to apply the following actions
# on the packet.
out_port = ofproto.OFPP_FLOOD
dstMac = "FF:FF:FF:FF:FF:FF"
self.send_arp(datapath, 1, self.MAC_ADDR[datapath.id-1], ipv4_pkt.src, dstMac, ipv4_pkt.dst, out_port)
# Actions are applied in the same order as defined in the list.
# OFPActionOutput terminates the chain. So this call should be the last action.
actions = [parser.OFPActionDecNwTtl(), #decrease TTL count
parser.OFPActionSetField(eth_src=self.MAC_ADDR[datapath.id-1]), # set own mac as source
parser.OFPActionSetField(eth_dst=dstMac), # set dst from arp request
parser.OFPActionOutput(out_port)] # forward packet through out_port
# Only install a flow if we#re in the first case (specific mac and out_port)
if ipv4_pkt.dst in self.ip_to_mac[dpid]:
# install a flow to avoid packet_in next time
match = parser.OFPMatch(in_port=in_port, ipv4_dst=ipv4_pkt.dst, eth_type=0x0800) #onlz match ipv4 packets
# verify if we have a valid buffer_id, if yes avoid to send both
# flow_mod & packet_out
if buffer_id != ofproto.OFP_NO_BUFFER:
self.add_flow(datapath, 1, match, actions, buffer_id)
return
else:
self.add_flow(datapath, 1, match, actions)
data = None
if buffer_id == ofproto.OFP_NO_BUFFER:
data = packet.data
out = parser.OFPPacketOut(datapath=datapath, buffer_id=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):
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
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 = pkt.get_protocols(ethernet.ethernet)[0]
if eth.ethertype == ether_types.ETH_TYPE_LLDP:
# ignore lldp packet
return
dst = eth.dst
src = eth.src
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
self.ip_to_mac.setdefault(dpid, {})
self.logger.info("packet in dpid: %s, src: %s, dest: %s, in_port: %s", dpid, src, dst, in_port)
#self.logger.info(pkt)
#learn mac to port mapping
if src not in self.mac_to_port[dpid]:
self.mac_to_port[dpid][src] = in_port
if eth.ethertype == ether_types.ETH_TYPE_ARP and src not in self.MAC_ADDR:
self.do_arp(datapath, pkt, eth, in_port)
return
if eth.ethertype == ether_types.ETH_TYPE_IP:
ipv4_pkt = pkt.get_protocol(ipv4.ipv4)
self.logger.info("IP src: %s, dst: %s", ipv4_pkt.src, ipv4_pkt.dst)
#check if packet is for this switch
if ipv4_pkt.dst in self.IP_ADDR:
icmp_pkt = pkt.get_protocol(icmp.icmp)
if icmp_pkt:
self.do_icmp(datapath, in_port, eth, ipv4_pkt, icmp_pkt)
else:
# forward the package into a different subnet
self.do_l3_switch(datapath, dpid, pkt, eth, ipv4_pkt, in_port, msg.buffer_id)
# packet is not for this switch, so do l2 switching
if dst != self.MAC_ADDR[dpid-1]:
self.do_l2_switch(datapath, dpid, pkt, eth, in_port, msg.buffer_id)
return
return