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controller.py
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from collections import defaultdict
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_0
from ryu.lib.packet import arp
from ryu.lib.packet import dhcp
from ryu.lib.packet import ethernet
from ryu.lib.packet import packet
from ryu.topology.api import *
from dhcp import DHCPServer
from queue import Queue
class ControllerAPP(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(ControllerAPP, self).__init__(*args, **kwargs)
self.arp_table = {}
self.swids = []
self.host_port = {}
self.adj = defaultdict(lambda: defaultdict(lambda: None))
self.port_state = {}
def clear(self):
self.swids = []
self.adj = defaultdict(lambda: defaultdict(lambda: None))
def update_topo(self):
self.clear() # init table
self.swids = [sw.dp.id for sw in get_all_switch(self)] # get all dpid
links_list = get_all_link(self)
for link in links_list: # get all link
self.adj[link.src.dpid][link.dst.dpid] = link.src.port_no
self.adj[link.dst.dpid][link.src.dpid] = link.dst.port_no
for cur_switch in self.swids: # for each switch
for host_mac in self.host_port.keys(): # then for each host mac
host_swid = self.host_port[host_mac][0]
host_port_no = self.host_port[host_mac][1]
sw_port = self.shortest(cur_switch, host_swid, host_port_no) # find sp
if sw_port: # has path
for sw_id, out_port in sw_port:
dp = get_switch(self, sw_id)[0].dp
match = dp.ofproto_parser.OFPMatch(dl_dst=host_mac)
actions = [dp.ofproto_parser.OFPActionOutput(out_port)]
mod = dp.ofproto_parser.OFPFlowMod(datapath=dp, match=match,
priority=1, actions=actions)
dp.send_msg(mod) # send flow table
for src_mac in self.host_port.keys():
if self.host_port[src_mac][0] == cur_switch: # src host
src_port = self.host_port[src_mac]
if sw_port and self.port_state[(src_port[0], src_port[1])]:
self.print_path(sw_port=sw_port, src_mac=src_mac, dst_mac=host_mac)
elif src_mac != host_mac:
print(f"Net is break for {src_mac} to {host_mac}")
def print_path(self, src_mac, sw_port, dst_mac):
if sw_port[0][0] != self.host_port[dst_mac][0]:
cnt = -1
info = f"src_mac: {src_mac} -> "
for sw_id, out_port in sw_port:
info = info + f"s{sw_id} -> "
cnt = cnt + 1
info = info + f"dst_mac: {dst_mac}"
info = info + f", switch dis = {cnt}"
print(info)
def shortest(self, src_sw, dst_sw, dst_port):
if not self.port_state[(dst_sw, dst_port)]:
return None # host port shut down, None
if src_sw == dst_sw: # dst switch to host
return [(dst_sw, dst_port)]
dis = {} # distance
fa = {} # father node
nodes = self.swids
for node in nodes:
dis[node] = float('inf') # init
fa[node] = None
que = Queue()
que.put(src_sw)
dis[src_sw] = 0
while not que.empty():
cur = que.get() # BFS
for sw in nodes:
if self.adj[cur][sw] is not None and dis[sw] > dis[cur] + 1:
dis[sw] = dis[cur] + 1
fa[sw] = cur
que.put(sw)
path_ids = []
if dst_sw not in fa.keys():
return None # can not reach host
father = fa[dst_sw]
cur = dst_sw
while True: # find the father node
if cur == src_sw:
path_ids.append(src_sw)
break
elif father is None:
return None
else:
path_ids.append(cur)
father = fa[cur]
cur = father
path_ids.reverse() # we get the switch ID in this path
sw_port = []
for step in range(0, len(path_ids) - 1):
out_port = self.adj[path_ids[step]][path_ids[step + 1]]
sw_port.append((path_ids[step], out_port))
sw_port.append((dst_sw, dst_port))
return sw_port
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
"""
每当RYU控制器收到OpenFlow协议中的packet_in消息时，packet_in_handler函数就会被调用，
因为这个函数被注册到装饰器set_ev_cls中，并且装饰器将packet_in_handler注册到packet_in消息上，每当收到packet_in消息时就调用该函数
"""
try:
msg = ev.msg # 每一个事件类ev中都有msg成员，用于携带触发事件的数据包
datapath = msg.datapath # 已经格式化的msg其实就是一个packet_in报文，msg.datapath直接可以获得packet_in报文的datapath结构
# datapath用于描述一个交换网桥，也是和控制器通信的实体单元
# datapath.send_msg()函数用于发送数据到指定datapath
# 通过datapath.id可获得dpid数据
pkt = packet.Packet(data=msg.data)
ofproto = datapath.ofproto # datapath.ofproto对象是一个OpenFlow协议数据结构的对象，成员包含OpenFlow协议的数据结构，如动作类型OFPP_FLOOD
parser = datapath.ofproto_parser # datapath.ofp_parser则是一个按照OpenFlow解析的数据结构。
inPort = msg.in_port
if pkt.get_protocols(arp.arp):
pkt_arp = pkt.get_protocol(arp.arp)
pkt_eth = pkt.get_protocol(ethernet.ethernet)
# TODO: handle other protocols like ARP
if pkt_arp.src_ip == pkt_arp.dst_ip: # arping, update arp table
self.arp_table[pkt_arp.src_ip] = pkt_arp.src_mac
elif self.arp_table.get(pkt_arp.dst_ip):
req_mac = self.arp_table.get(pkt_arp.dst_ip)
arp_pkt = packet.Packet()
arp_pkt.add_protocol(ethernet.ethernet(ethertype=pkt_eth.ethertype,
dst=pkt_eth.src, src=req_mac))
arp_pkt.add_protocol(arp.arp(opcode=arp.ARP_REPLY,
src_mac=req_mac, src_ip=pkt_arp.dst_ip,
dst_mac=pkt_arp.src_mac,
dst_ip=pkt_arp.src_ip))
arp_pkt.serialize()
parser = datapath.ofproto_parser
actions = [parser.OFPActionOutput(inPort)]
ofproto = datapath.ofproto
out = parser.OFPPacketOut(datapath=datapath, buffer_id=ofproto.OFP_NO_BUFFER,
in_port=ofproto.OFPP_CONTROLLER, actions=actions, data=arp_pkt)
datapath.send_msg(out)
elif pkt.get_protocols(dhcp.dhcp):
DHCPServer.handle_dhcp(datapath, inPort, pkt)
except Exception as e:
self.logger.error(e)
@set_ev_cls(event.EventSwitchEnter)
def handle_switch_add(self, ev):
print("Add Switch")
self.update_topo()
@set_ev_cls(event.EventSwitchLeave)
def handle_switch_delete(self, ev):
print("Delete Switch")
self.update_topo()
@set_ev_cls(event.EventHostAdd)
def handle_host_add(self, ev):
print("Add Host")
host_mac = ev.host.mac
self.host_port[host_mac] = (ev.host.port.dpid, ev.host.port.port_no)
self.port_state[(ev.host.port.dpid, ev.host.port.port_no)] = True
self.update_topo()
@set_ev_cls(event.EventLinkAdd)
def handle_link_add(self, ev):
print("Add Link")
self.update_topo()
@set_ev_cls(event.EventLinkDelete)
def handle_link_delete(self, ev):
print("Delete Link")
self.update_topo()
@set_ev_cls(event.EventPortModify)
def handle_port_modify(self, ev):
print("Modify Port")
for port in self.port_state:
if (ev.port.dpid, ev.port.port_no) == port:
self.port_state[(ev.port.dpid, ev.port.port_no)] = ev.port.is_live()
self.update_topo()